The traditional two-dimensional CAD for the design of the crane

With traditional two-dimensional CAD design of crane time cycle is long, repeated design, product innovation is insufficient, the engineer's design experience is not very good inheritance, makes the design efficiency of series of products is not ideal. Bridge crane is designed to experience of design, development, evaluation, manufacturing cycle repeatedly, the process time is long, and the design cost is high, the efficiency is low, the risk is big. And the use of modular design, through the component level, generalization and standardization can simplify the product structure, make the product diversification. At the same time using the overhead gantry crane design of gantry crane and 3 d parametric modeling technology, can reduce repeated labor and improve the design efficiency, make products to satisfy user needs. At the same time using an interactive simulation technology, the bridge crane driver's operating system can be virtual simulation, set up the corresponding effects, truly simulate the crane work and working conditions, to predict the potential risks in the working process of the bridge crane, and can improve the work efficiency of bridge crane. bridge gantry crane as interactive simulation tool, has great advantages in terms of interactive simulation. Through the driving of bridge crane operating system in virtual simulation, 3 d model to realize the keyboard control, the man-machine interaction effect.

Bridge crane in horizontal plane in workshop

Bridge crane in horizontal plane in workshop, warehouse, etc, is hanging objects of machinery and equipment, also referred to as the "road" or "crane". Bridge crane is widely used in industrial and mining enterprises, port, wharf, construction site, warehouse, station, bridge gantry crane development, space navigation and so on all walks of life, in the process of our modernization construction plays a huge role. Tin metallurgical industry crane is the main equipment, production plant transport material metallurgy bridge crane has to adapt to bad working environment and high load operation efficiency is high, the level of work, study of bridge crane has a overhead gantry crane significance to the development of metallurgical industry. Profile bridge crane bridge crane is one of the main types of crane, because of its running at high altitude, scope of operation that sweeps across the whole factory area, almost got rapid development. Bridge crane accounted for about 90% of the number of indoor crane, hoisting machinery is the so-called "largest production batch, the material consumption of the product. The classification of the bridge crane in order to adapt to different work situations, bridge crane appeared a variety of types. Currently, depending on the bridge crane structure form, it can be divided into electric single beam cranes, electric hoist bridge crane, gm bridge crane and other types.

Lines exist in electric hoist gantry crane

Crack exists in electric hoist gantry crane on beams, cracks are mainly concentrated in beams and girders connection parts and beam connected to the leg on the parts of the parent bridge gantry crane or weld. 2 causes the crack part stress state is complex, such as bending stress and shear stress and welding stress, both to carry hoisting load and dead weight load overhead gantry crane by the bending stress and shear stress, and at the same time, the operation of the lateral load, big, the car braking inertia load and wind load, and so on. Stress is larger, therefore, the local synthesis with cantilever crane, the load on the cross and cantilever end beam weld on both sides there are alternating stress and angular distortion in the opposite direction, combined with structural reason is easy to produce stress concentration, and therefore part of weld and parent metal under alternating stress and stress concentration susceptible to fatigue damage. Design flaws in the side of the leg on the top of the beam by two independent small box girder (or i-steel) structure, as shown in figure 1. Causes of crack for stress concentration, uneven force and stiffness. 8 of this type of crane in our city in the cracks without exception, the shortest using only 3 ~ 4 months appeared crack, crack of the other in a test cycle. Beams on the independent structure crack distribution material crack, crack on weld beam bending crack.

The starter overrunning clutch

Starter overrunning clutch is the key overhead gantry crane of motorcycle electric starting system, is also a weak link, the startup process directly affects the working performance of the starter motor. Compared with the usual clutch, the axis of rotation to the starter overrunning clutch has advantages of convenient maintenance and low cost, which is widely applied in various types of motorcycles. With the ordinary starter bridge gantry crane clutch driven by an electric fork compared with the workings of a flywheel ring gear meshing axis of rotation to the starter overrunning clutch is to use the starter motor clutch rotation inertia force of its own cause and flywheel ring gear meshing. Therefore, the start characteristics different from those of ordinary clutch start characteristics, and the domestic research is still less. Article set up the axis of rotation to the starter one-way clutch, the mathematical model of the boot process, using MATLAB/Simulink simulation model is set up, the result of the experiment and simulation was consistent, verify the correctness of the model. On the basis of the study the influence of structure parameters on the starting characteristics of the clutch, which provide complete for design and optimization of this kind of new clutch

Double beam bridge crane visual design

Double beam bridge crane visual design: bridge crane is widely used in industrial production process, with the development of the progress of science and technology, overhead gantry crane technology and the increasingly fierce market competition, the quality of the design of the crane and the efficiency is higher and higher demands are proposed. Traditional bridge gantry crane technical personnel in the bridge crane design, especially for the design process requires a lot of manual calculation, drawing, design process repeatedly, long cycle and low efficiency; And the optimization design, often also is not intuitive, is bad to adjust, often cannot meet the needs of the series design or special requirements. We can in the visualization technology of crane CAD design, combined with the optimization, through the program design, improve the design speed, shorten the design cycle, to improve product performance and reduce the production cost of the products series product development design and play an important role in such aspects as non-standard design. Double beam bridge crane of visual design using computer graphics, visualization is to convert data into graphics displayed on the screen, make the process visual indication of methods and techniques.

On both ends of the bridge by running the device directly support in the elevated bridge type crane on the tracks

On both ends of the bridge by running the device directly support in the elevated bridge type crane on the tracks, referred to as the "bridge crane". Shaped like a two-terminal bracing in overhead gantry crane parallel two overhead orbit running single span slab bridge. Lifting mechanism is used for vertical lifting objects, the classification of the bridge crane, gm bridge crane. To grab bridge crane are gm bridge crane. Grab bridge crane, laying track crane truss string directly. The construction bridge gantry crane shall be the same as the continuous crane beam. Heavy duty crane beam, the flange and the column or brake on bit plane passing horizontal force of friction type appropriate USES high strength bolt connections, and BuYi flange connection with brake beam, friction type high strength bolt connection can be used or weld connections.

A computerized model to optimize location of a group of tower cranes is presented

A computerized model to optimize location of a group
of tower cranes is presented. Location criteria are balanced workload, minimum likelihood of bridge gantry crane with each other, and high efficiency of operations. Three submodels are also presented. First, the initial location model classifies tasks into groups and identifies feasible location for each crane according to geometric ‘‘closeness.’’ Second, the former task groups are adjusted to yield smooth workloads and minimal conflicts. Finally, a single-tower-crane overhead gantry crane model is applied crane by crane to search for optimal location in terms of minimal hook transportation time. Experimental results and the steps necessary for implementation of the model are discussed.  Crane location models have evolved over the past 20 years. Warszawski (1973) established a time-distance formula by which quantitative evaluation of location was possible. Furusaka and Gray (1984) presented a dynamic programming model with the objective function being hire cost, but without consideration of location. Gray and Little (1985) optimized crane location in irregular-shaped buildings while Wijesundera and Harris (1986) designed a simulation model to reconstruct operation times and equipment cycles when
handling concrete. Farrell and Hover (1989) developed a database
with a graphical interface to assist in crane selection and location. Choi and Harris (1991) introduced another model to optimize single tower crane location by calculating total transportation times incurred. Emsley (1992) proposed

Electric hoist gantry crane is a kind of electric hoist bridge crane deformation

Electric hoist gantry crane is a kind of electric hoist bridge crane deformation. The electric hoist crane can be divided into electric hoist gantry crane and electric hoist cantilever gantry crane structure of two kinds of forms. Electric hoist gantry crane and can be divided into: the gantry overhead gantry crane and gantry crane. The electric hoist can be divided into the double cantilever gantry crane cantilever gantry crane and two single cantilever gantry crane. Electric hoist crane is divided into a variety of. This q good electric hoist and electric hoist gantry crane main difference is that electric hoist is a small-sized lifting equipment, it is divided into wire rope electric hoist and bridge gantry crane electric hoist. Chain electric hoist is mainly divided into two kinds of imported and domestic electric hoist electric hoist. Wire rope electric hoist is mainly divided into: CD type wire rope electric hoist and MD1 wire rope electric hoist and riot, metallurgy, electric hoist, electric hoist There is a miniature wire rope electric hoist, hoist, multi-function winder.

is laid on the orbits of the horizontal run, constitute a rectangular scope of work

Bridge crane is a bridge in high orbit a bridge typebridge gantry crane, also known as the crown. Bridge crane bridge along the laid on on both sides of the elevated rail longitudinal operation, lifting trolley along the bridge is laid on the orbits of the horizontal run, constitute a rectangular scope of work, can make full use of bridge the space below the lifting materials, from the ground equipment obstacles. The characteristics of the bridge crane can be made on a hook or other fetch device weight implement vertical or horizontal migration in space. Bridge crane including: lifting mechanism, big, the car run institutions. Rely on these institutions cooperate with action, can make the weight in a cube space lifting and handling. Bridge overhead gantry crane, gantry crane, gantry crane, metallurgical and cable crane and so on all is such.

More small bridge crane brake

More small bridge crane brake, reducer and motor group synthesis drive mode, the integration of the "triad" big lifting sino hoist of ordinary bridge crane for ease of installation and adjustment, drive often adopt universal coupling. Crane operation normally just four driving and driven wheels, if the weight is very big, hoist gantry crane used to increase the wheel round ways to reduce pressure. When the wheels for more than four, must adopt balanced articulated frame device, make the crane load evenly distributed on each wheel.

Electric double girder crane is composed of what conditions?

Now with electric double girder  bridge gantry crane  on the market is that people pay greater attention to the product, along with its reputation in the market, so good, along with its development speed so fast, the effect is so good, so people also prefer to use their in the course of its use are generally more comfortable, which is a feature of its relatively large, in the course of its use, there are many companies on the electric double girder cranes are more optimistic, and think it is useful potential for development, so its frequency of use is relatively high, so now is the electric double girder crane what conditions constitute it?
1 electric
As the electric double girder  overhead bridge crane  certainly constitutes the most important condition is electric, and generally in the course of its electric operation is automatically operated, generally able to automatically operate product is loved by a lot of people, under normal circumstances so much loved by the odds are not great, unless it is one of their more optimistic or is it in the market has developed over the years, and only in this case will have electric products, so that the electric products on the market is are more useful.
2 double beam
General Electric double beam crane for its use in the process often comes in many forms, the forms, the more the more it is advantageous for the product, so that the more the more favorable product better able to survive in the market this is inevitable, so the electric double girder  overhead gantry crane  is more of a product to make it feel comfortable.
This is some of the electric double girder crane constitute conditions.

How to treat electric double girder crane it?

Is now on the market for electric double girder  Steel crane   are to be properly managed, like this mechanical equipment if you do not manage them properly or in the use of the time to pay more attention, be careful, it may be more time broken short, because the pressure is too large or super overdraft work will make electric double girder crane on the market cut short the life of the moment, so that you want to extend the life of the electric double girder crane that is relatively good, so now how to treat electric double beam crane it?
1 Installation
Installation is now on the market using electric double girder  hoist gantry crane  products business is more general in its use of the process is more useful, like this large product development hope is relatively rare, but the electric double girder crane is one of them, at the time of its installation are more installation requirements, under normal circumstances in the process of installing them is a more demand, but the installation also requires a process, and can not at once installation is complete .
(2) Maintenance
Treat electric double girder  overhead gantry crane  at the time is the need to take good care of them, because in the course of its maintenance is relatively good, the better the general maintenance of life will seem longer, only in this case the following can appear a little better, maintenance of good product development, the better.
This is the kind of electric double girder crane in several ways.

Accelerate the construction of infrastructure in Western Mining Machinery greet opportunities

   Since the debt crisis affecting the entire global economy since the market was weak throughout the state of mining  hoist crane  , mechanical equipment sales market showed negative growth trend. However, in the relevant national policies and programs under the influence of the western region of infrastructure ushered in a new round of increases and also boost the mining machinery market.
Accelerate regional infrastructure
    Although the country has been the policy to encourage the construction of the western region , but from the point of view of economic development , the construction of the western region the effect is not large . Currently the eastern region of basic infrastructure tends to saturation , the focus of the country's construction once again tilted towards the west , and the corresponding mining machinery enterprises will also be on the market in the western development for further improvement. State Council promulgated the "Western Development " second five "plan" and a series of policies, including transportation, water conservancy , urban construction, resource development , including development projects in full swing ,jib crane which have greatly stimulated the western mining machinery market expansion. Data show that , "Twelve Five" period, Xinjiang will invest 100 billion yuan annually for urban construction . Transport facilities are expected to invest 120 billion to 150 billion yuan , 1.1 million meters of construction of roads , of which highway 1966 kilometers, State Road Highway over 1300 kilometers. In addition , it will further increase the mineral resources exploration and development efforts, in 2010 the central government units on an additional 1.1 billion yuan for the exploration of mineral resources in Xinjiang , we can see that the government 's support is evident. A western region of Xinjiang provinces , there is just such a large market , bringing the entire western infrastructure needs will greatly boost the mining machinery industry . February 20, 2012 , the State Council officially approved the National Development and Reform Commission organize the preparation of the " Western Development " second five "plan" ( hereinafter referred to as the "Plan" ) . "Plan " clearly put forward the "second five " period western development related construction in full deployment, including key tasks and major projects . Accordance with the " planning", " Twelve Five " period, Western will give priority to infrastructure construction , accelerate the construction of transportation, water conservancy focused moderate advance , functional support, safe and efficient , modern infrastructure system . And these are the increasing demand for mining machinery, an important factor .
Mining machinery market promising
    Developing the western region to promote sustainable development and support of relevant national policies , will help the western economy onto the fast track of development . West is the most important part of the development of infrastructure, expansion of the market , which has also been a growing number of heavy machinery, mining machinery industry attention . For example, the general downturn in the industry in 2011,gantry crane Yantai Xinhai Mining Machinery Mining Machinery Co., Ltd. in Xinjiang, Qinghai, Gansu and other provinces have maintained a rapid growth, in 2011 sales turnover exceeded 200 million mark. Meanwhile, according to analysis of Yantai Xinhai marketing personnel, as the weather is getting warmer , many construction and mining resumed , this year the market will have greater growth .
"Plan " introduced to further enhance the mining machinery industry development of the western region 's confidence in the market and is committed to the development of the western region machinery industry market development .bridge gantry crane The western region 's infrastructure will greatly boost domestic mining machinery industry market offers great opportunities .

China's " two sessions" on the issue of construction machinery sounds

On March 5 the government work report that: " China's manufacturing industry scale ranks first in the world , high-tech manufacturing value added average annual growth of 13.4 percent,bridge gantry crane becoming an important national leader and pillar industries ." But on a pillar industry - manufacturing the whole, there are several aspects of the current problems and deficiencies at the national development plan the next step progressively studied and resolved.
    First, technology and capital investment slightly less , more a lack of high-end talent . Since innovation capability is weak, the lack of independent intellectual property rights , it is difficult occupied high-end chain .
    Second, land , labor, capital, technology and other factors of production problems of environmental resources as a constraint structure adjustment and upgrade high-end manufacturing constraints .
    Third, the high-end manufacturing industry overall is not extended , the design and development and other ancillary services can not keep up issues highlighted.
    Fourth , financial services , industrial development project planning from the high-end manufacturing demand is still not a small distance.
    However, a branch of the field of the manufacturing sector - construction  eot crane  industry, can be reassuring , in two sessions on a number of issues , the investment is still to promote economic development in the main event in 2013 . By new urbanization and infrastructure driven, followed by rail road , real estate, irrigation and water conservancy project started, is expected to usher in engineering machinery moderate recovery situation. Data show that in December 2012 , the country 's construction machinery industry total industrial output value 56,735,000,000 yuan , an increase of 11.39% , growth of 32.06% . " Urbanization " strategy proposed a nationwide infrastructure to stimulate the construction of a large number of investments, including railways, highways , bridges and so on. Infrastructure construction cycle is longer, the average period is 2-3 years, so in a long time , the application of engineering machinery market has been a certain guarantee , the industry's overall sales and revenues to maintain a certain level will be high.
    Although the outlook is good, but as a potential threat to manufacturing , engineering machinery industry is also an urgent need to address a range of issues before they can be healthy and orderly development of the industry .
    First, greater efforts to save energy manufacturing , low-carbon eco-friendly products
    In the March 3, 2013 meeting at the second session of the CPPCC National Committee meeting, Comrade Jia Qinglin on behalf of the Eleventh CPPCC National Committee Standing Committee work report . Jia Qinglin focus mentioned, we must promote the functioning of ecological civilization construction as an important focal point, through research visits ,hoist gantry crane conferences and forums , information and other proposals continued advice and suggestions put forward to set national "five " binding energy consumption indicators positive recommendations , and get the CPC Central Committee and State Council attached great importance to and adoption .

Accelerate the high-end engineering machinery and equipment R & D capabilities

     Current by the introduction of advanced technology , high-end products still rely on imports of China's equipment manufacturing industry is facing the harsh reality . High-end machine tools , high-end engine , high-end instrumentation and control systems , need from abroad .bridge gantry crane Among them, 90% of imports of high-end CNC machine tools , CNC system 95% of imports , imports 70 percent of instrumentation . In the field of infrastructure components for high-end CNC machine tools supporting 70% of high-end features need to import large construction machinery hydraulic parts required for all imports above 30MPA , speed of 200 km above the gear box , 2.5MW wind turbine gearbox above , large-scale coal gear box , high speed train brakes, large shield machine electro-hydraulic drive unit , almost all imports . Although in terms of marine diesel engine with advanced foreign enterprises to develop a joint venture , co-production , but the key core technology and brand still rests in the hands of foreign enterprises ,overhead bridge crane not to get rid of "wage " type of processing and manufacturing position.
WangRuiXiang stressed that China's equipment manufacturing industry , the most important thing is to accelerate independent research and capacity building. Countries on the one hand to find a way to give policy support, on the other hand to integrate resources , technology research organization . "At present , China's research institutes strength is still very fragmented, should think of ways to integrate focus areas , universities should also consider how to get involved in. I believe the strength of several organizations together, our country will be able to gradually break through the technical bottleneck breakthrough high-end equipment manufacturing monopoly status of foreign enterprises , and gradually form a high-tech for the lead, in the value chain and core aspects of the industry chain , to enhance the core competitiveness of the industry 's high-end equipment manufacturing industry . "
Similarly, the CPPCC National Committee, the National Machine Group Co., Ltd. Chairman Ren Hongbin also pointed out that the current level of China's equipment manufacturing industry, compared with foreign countries there is a big gap that needs some investment and policy support , the level of development of high-end equipment manufacturing industry enhance up . High-end equipment to change our international competitiveness is not strong , a higher degree of external dependence situation. The National People's Congress , Chery Heavy Industries Co., Ltd. General Manager Wang Jinfu it is said that "high-end equipment manufacturing, to big to say , a symbol of a country's core competitiveness , involving the country's economic and national security ; talked to the small , many industries and enterprises related to the survival and development . " acceptance , including " China joint Business News ", including a media interview, said that over the past decade , the rapid development of China 's  overhead gantry crane  industry , China has become a veritable equipment manufacturing country , but also not the equipment manufacturing powerhouse ; but to achieve " from large to strong " dream, must enhance the independent innovation capacity, accelerate the development and promotion of independent high-end equipment manufacturing industry .

The implementation of " going out" strategy, and actively expand the international footprint

  Implementation of the enterprises "going out " strategy, carrying out international capital operation "Dances with Wolves " is the transformation of economic development to the country 's positive practice .
    Chinese enterprises international operations provides us with an opportunity to close in the international market ,hoist gantry crane will effectively enhance the international competitiveness of Chinese enterprises , and promote China from a manufacturing power to create powerful shift from extensive , quantity to quality , and efficiency transformation.
Throughout the dominating international world-class enterprises, they have similar characteristics - the main business income in the world, with a global brand image and leading-edge technology , leading the industry change and innovation , with advanced management tools and unique development strategy , with professional, professional staff. These companies provide products and services to the world , while also convey their country 's culture.
    China's  Steel crane  manufacturing industry , the general supply of spare parts is very adequate , however , such as transmission components , control components , diesel engines and hydraulic parts and other key high-tech, high value-added core components of the primary still dependent on imports, serious restricting China's equipment manufacturing industry to the development of high- technology products . With China's economic structural adjustment, change the mode of development to accelerate the pace of domestic enterprises have been trying to break through the key components of the core technology , more and more Chinese enterprises to the sea voyage , to strengthen international capital operation , hoping to obtain cross-border mergers and acquisitions abroad advanced technology to enhance their core competitiveness.
    Indeed, over the 2012 , China 's construction machinery industry staged more than the case of overseas mergers and acquisitions of Chinese enterprises "going out " shows not only its own brand image , it is the country's image .
To sum up, China issued two sessions on " construction machinery " sound , the sound piercing the current construction machinery industry, the existence of various deficiencies and shortcomings , but also for China 's future development of construction overhead gantry crane  clear . Waits for no man , we need to further cultivate internal strength , a positive innovation , efforts to expand overseas markets , to participate fully in international competition. Only in this way , China 's construction machinery to be able to really strong , we are able to China from a large industrial country into an industrial powerhouse !

The safe operation of cranes

Truck crane is mounted on the chassis or regular car a special  gantry crane  chassis on its driving cab and crane cab be set separately. This crane has the advantage of good mobility shift rapidly. Disadvantage is that when working legs, can not load driving, do not fit in soft or muddy work on site. Truck crane lifting operation is part of the general or special vehicle mounted  bridge gantry crane  chassis, and has a truck driving performance. In order to meet the requirements of driving under adverse conditions, derived with off-road performance truck cranes. Crane in front of prohibited jobs, that the center of gravity hook lifting operation shall not exceed the rotation center of the front leg (left) ground connection to the centerline. In the starting weight indicating device malfunction can not be used with the case should be lifting performance shall be determined from the weight of the table, we must standardize  hoist gantry crane  operation behavior, to ensure safe and correct. Lifting heavy objects are not allowed off the arm; must drop the weight down to re-arm rises when the job; fall when the throttle arm is smaller, Raise when the throttle should be large; rotary action should be smooth, not allowed to sudden stops; Job ago to carefully check, prohibit the use of substandard steel wire rope and lifting chain; lifting heavy objects are not allowed off the arm; must drop the weight down to re-arm rises when the job; fall when the throttle arm is smaller.

Frequency converter in the crane electronic control system application

Introduction
Lifting industry using PLC- inverter gradually in recent years to promote and popularize , especially in large lifting equipment , with PLC program control to replace the traditional relay - contactor control ; replaced with a variable speed motor winding series resistance rotor speed ; asynchronous motor with inverter motor or replace the motor winding , coupled with advanced fieldbus technology and HMI system to improve the control accuracy and stability of the equipment , reduce the failure rate , and the energy-saving effect is remarkable , easy repair and maintenance , improve production efficiency to become a good way .
Control scheme
A large heavy machinery manufacturing plants, bears all the bulky equipment assembly , positioning, docking and other tasks, the  overhead gantry crane  high performance requirements , the use of an overhead crane used QD250/50t siemens S7-400 PLC, ABB inverter , touch screen and other high-performance configuration, application of advanced Profibus fieldbus technology , with encoder feedback direct torque control, and advanced human-machine interface system.
Divided into the main bridge crane hook, deputy hook , carts , trolleys and other four parts. Due to the main  eot crane  hoisting mechanism in most typical applications , control is also the most complex , so the main hoisting example in this chapter detailing its control.
1, PLC
The whole system S7-400 PLC as the core of electronic control , the main power supply module , CPU, input and output modules and interface modules and other components. Acquisition by a limit switch input modules , thermistors, inverter and other equipment fault feedback signal state ; receiving master controller , buttons, switches send control commands concentrated in the CPU operation and program operation result output module and Profibus fieldbus send contactors and inverters perform device to the drive motor , hydraulic brake , cooling fan and other complete various production tasks.
2, Profibus fieldbus system serial communication
Profibus is an open serial communication standard that enables data exchange between various automation components . In this system with S7-400 as the main station to the agencies as a slave drive by DP interface module and RS485 shielded twisted rapid real-time data exchange .
Set the inverter communication parameters :
98.02 = fieldbus communication module activation
51.01 = Profibus-DP field bus type selection
51.02 l = 3 to set the main inverter station address
51.03 = 1500 selected communications transmission rate of 1.5Mbit / s
51.04 = PPO4 select data type 4 ( 6 process data as a standard block )
As a master PLC CPU reads from the slave state of various input information, namely primary l read from the drive status word and actual values, including the drive is ready , power- response operation, the torque verification OK, inverter failure , the actual motor speed and other information ; and write information to a variety of output from the station , about the control word and speed reference written inverter. Including communications test position, from fieldbus PLC system Drive on, the start signal from the host system , fault reset signal and the actual frequency reference and so on. The complex signal conversion , monitoring, feedback process all data transmission via Profibus chain , and CPU quick focus easily .
3 , advanced man-machine interface system
TP270 touch screen and PLC Profibus bus is also used for data transmission and exchange , real-time display and monitor the operational status of the agencies and the voltage, current, torque, speed and other operating parameters , and can use its own real time fault diagnosis system Symptom judge , recording failure of various parameters , so that operators and maintenance personnel can fully understand the state of the system in a timely manner , and may prompt fault information to inspection and maintenance , to achieve accurate and fast troubleshooting effect , the real achieve a human intelligence .
4, the frequency control system
1 ) Lifting conditions and requirements
Hoisting mechanism requires a larger speed ratio and mechanical characteristics of hardness to suit the precise weight lifting requirements ; require a large starting torque ,bridge gantry crane excellent dynamic torque response ability to adapt to sudden load change , ensure that the heavy secondary lifting capacity ; must solve regenerative braking energy feedback and processing, in order to shorten the deceleration stopping time ; slide the hook must solve the problem .
2 ) conversion function application
According to the hoisting mechanism characteristics and technical requirements , the drive uses with a tachometer feedback interface 800 series drives, with ACC 7.2 Special upgrade software , form a closed loop direct torque control, through the pre-excitation function and starting torque setting , the motor starts instantaneous torque up to 300 %, achieved an excellent starting characteristics . built-in brake chopper , external braking resistor , braking process so that the generation of energy through regenerative braking resistor to be released , to achieve the purpose of rapid braking . Using a mechanical brake control function, so that the motor torque and brake release closely with better improve the safety of the equipment , the ability to withstand the impact of frequent starting and reliability also increased significantly .

320T double girder overhead crane

The crane mainly by the box-shaped bridge,  bridge crane  trolley traveling mechanism and electrical control system. Extract device is a hook.
Main beam is off-track width box girder, electrical equipment and traveling mechanism are installed in the main beam interior.
Operation with wireless remote control and two operating cab form. Cab with open, closed two, there are adjustable seat, floor laying insulation pad, windows with tempered glass, with a fire extinguisher, electric fans, according to user requirements heating and air conditioning, transducers, walkie-talkies and other items .
The crane suitable for ambient temperature -10 ℃ ~ 40 ℃, relative humidity less than 85% of factories, warehouses and garages, etc. for loading and unloading lifting work prohibited on the flammable, explosive and corrosive gases filled environment.
The crane mainly by the box-shaped bridge,  hoist gantry crane  trolley traveling mechanism and electrical control system. Extract device is a hook.
Main beam is off-track width box girder, electrical equipment and traveling mechanism are installed in the main beam interior.
Operation with wireless remote control and two operating cab form. Cab with open, closed two, there are adjustable seat, floor laying insulation pad, windows with tempered glass, with a fire extinguisher, electric fans,bridge gantry crane according to user requirements heating and air conditioning, transducers, walkie-talkies and other items .

From the weight of the basic functions of the limiter

From the weight lifting torque limiter limiter and collectively overload protection device. Overload caused by  jib crane  operation is one of the major accident, the light damaged crane parts, so click on overload, structural deformation; heavy causing broken beams, inverted tower, folding arm, the machine overturning a major accident. Using sensitive and reliable overload protection device is to improve the intrinsic safety of the crane, effective measures to prevent overloading the accident.

From the weight of the basic functions of the limiter

1, dynamic load suppression. Overload protection device should be able to distinguish between the actual overload  gantry crane  hanging objects in the normal operation lifting, braking, running and other effects arising from the dynamic load. Hanging objects Guaai (or consolidation with the ground), you should be able to work immediately. Hanging objects caused by the additional dynamic load lifting operation is inherently dynamic phenomenon. Prevent dynamic load effects can be taken latency technologies. However, this delay may be working blind. If within this time stuck hanging objects, the rope tension in a very short time to achieve the degree of damage to the crane, the use of this technology products should solve this problem.

2, automatic job functions. Overload protection devices work properly, you should be able to automatically perform specified functions, should not increase the additional operating the bridge gantry crane  driver.

3, the fail-safe function. Promote product has an automatic safety feature, when failure occurs inside the product, you can send an alarm signal indicative.

General requirements for the design of crane hook

Crane hook is the main component, once corrupted very easily lead to serious injury or death. Therefore, we must strengthen the professional manufacturer of hook and general manufacturing enterprise with a hook in the hook and safety supervision and inspection work.  eot crane  hook design generally requires the following 10 points:

One should consider the use of environmental requirements.

2, should meet the strength, plasticity and toughness, fatigue resistance and shock functional requirements.

3, to meet the requirements of design and technology.

4, forging hook fiber orientation, should seek to comply with a hook shape distribution. Forged hook should be performed after heat treatment.

5-piece hook rolling direction of the laminations and fiber orientation, should strive to be consistent direction of the pressure must be eliminated using cutting heat-affected zone formation.

6-piece body and suspension hook and plywood does not allow access.

7, the use of forged or rolled materials can not meet the performance requirements or difficult to manufacture,hoist gantry crane the use of a casting manufacturing, must demonstrate its use or through practical experience confirms it applies only when permitted.

8, the surface and inside the hook should not be sufficient to impair its usability shortcomings.

9, manufacturing materials and purchased parts hook should have manufacturing units certificate and other technical documents, or should be tested to identify performance qualified before use.

10, after the inspection of the hook, the manufacturer shall make an appropriate position in the hook is not easy to be worn marks, and issue certification. Tag should include at least the rated weight,hoist crane production number, date of manufacture, manufacturing units, the original opening degree hook other items.

Type of crane lifting limiter

overhead bridge crane overload protection devices according to their different functions can be integrated into automatic stop-and-two. Classified according to their institutional forms, there are two kinds of electrical and mechanical type.

Auto-stop type. It refers to lifting the quality of more than nominal weight, they can stop the crane to unsafe direction (lifting, outriggers, drop arm, etc.) continues to operate, while allowing the crane to a safe direction movements.

Integrated lifting limiter. When lifting the quality is reached nominal weight of about 90% can be audible or visual alarm signal, lifting weight of more than nominal weight, they can stop the overhead gantry crane  unsafe direction to continue action, concurrent sound and light alarm signals, and allow the crane to a safe direction movements.

Electric-type lifting limiter. Refers to mechanical energy to electrical energy conversion between, to achieve protection. That the detected amount of the load and other mechanical converted into corresponding electrical signals, and then zoom, comparing, computing and processing. Habits become electronic, electric, electromechanical and microprocessor-based products are of this.

Mechanical load limiter. Refers to the conversion of mechanical energy and switch between fit to achieve protection.bridge gantry crane Machinery products is relatively simple, using leverage, eccentric, spring or hydraulic system to detect load, through limit switch (control valve) the product movements.

Portal crane boom system

Gantry  Steel crane  boom system is transmitted to the rotating platform to load the main components, can be made into single boom boom system or combination of systems.

Arm rack system: single boom luffing system is divided into rigid and flexible cable transmission amplitude of the arm frame. The former is characterized by the boom arm of the entire boom system is only rigid parts, as with weight balance system and a rigid arm drive means, which are arranged close to the luffing jib pull the root point, relying on the screw, screw drive achieve pitching arm. The second boom boom without balancing device luffing jib rope fixed on the head, relying on the income and the flexible cable release to achieve jib luffing.

Combination boom system: four-link portal overhead gantry crane  boom system is modular crane jib a typical pattern, it avoids some of the shortcomings arm frame body, so a combination boom system is widely used. And this combined with flexible arm can be divided into rigid cable type and cable type two.

1, the flexible cable type. It is the use of wire rope for the rod, and with the rear trunk frame geometry shape of the curve must achieve a level luffing movement of goods in the process. The whole structure lighter weight, but there are less rigid structure, rear rack and trunk cable connections easy to wear and other shortcomings. Previously in the small gantry  jib crane  lifting weight greater use in recent years has gradually been rigid rod replaced jib combinations.

2, the rigid rod combination arm. Rigid rod jib combination is determined by the trunk frame, rigid rod and hinge arm three part through the combination and makes up four-bar linkage with the rack in order to achieve a level luffing cargo movement process.

Cranes rising limit position limiter

Up limit position limiter is lifting one important safety device. When hoisting motion, the spreader in working height range. At the maximum working position, the spreader with the top of the supporting mechanism (such as a frame or a small  bridge crane, etc.) should have a certain distance. The specific size of this space, the driver is more difficult to master at work, coupled with inevitable negligence in work. Therefore, if the installation does not increase the limit position limiter or limiters failure, work, may occur to the upper supporting structure spreader top, and rising operation of the drive system lifting spreader situation continues,hoist crane resulting in wire breakage, and to spreader fall accidents.

Adopt and maintain its upper limiter work effectively to prevent similar incidents from happening, so "crane safety regulations" in the states: all power-driven crane, its lifting mechanism (including main and auxiliary hoisting mechanism), should be installation rising limit position limiter.

Up limit position limiter basic principle is the separation of a drive by the lifting motion action to trigger an electrical switch, resulting in increased transmission system to stop working,overhead bridge crane and thus play a protective role. The common form of hammer and screw two.

Common Crane Anti-tilting device

Performed with a flexible wire rope luffing  jib crane   , when faced with handling such situations , it will produce the boom backward force . Resulting boom exceeds the minimum amplitude backward crane accident occurred . Therefore, this type of crane installation Anti-tilting devices. Boom backward mainly caused by the following types :

1 , with the lifting slings, rigging or hoisting wire rope defects in the process of lifting a sudden rupture ; makes heavy fall ; or because rigger help hang properly, the process of lifting heavy objects scattered . These conditions can form suddenly unloaded , causing the boom bounce backward accidents.

2, due to failure of lifting height limiter , over winding farm accidents , resulting in wire breakage ; or directly on the boom is generated traction , resulting boom after dumping incidents.

3 , luffing mechanism out of control , while luffing limit switch failure , resulting in a luffing jib backward during an accident .

4, due to hurricane impact in the process of lifting crane backward causing accidents.

In order to prevent similar accidents in the country crane safety regulations in the clear requirements of mobile  gantry crane  and tower cranes moving wall should be installed on Anti-tilting device ( except hydraulic luffing crane ) .

Currently used anti- tilt device after most had two parts. First, by installing the hinge point on the jib luffing limit switches near luffing position . Sometimes boom driven via a linkage indicator amplitude and amplitude disc set position switch for limit . Then through a mechanical stopper means for the crane . Insurance rope and bumper are two commonly used anti- reclining device . Good safety rope has been calculated using the length and strength of the rope , one end fixed on the turntable , and the other end fixed to the jib , through the rope length , defining the inclination of the crane .

The Anti-tilting device shortcomings can not play the role of cushioning and shock absorption , shock and vibration bigger. To mitigate vibration and shock often used bumpers . The working principle of the bumper , the bumper is hinged at the upper end of the boom ,bridge gantry crane the lower end pivotally attached to the turntable ; bumper is a telescopic mechanism , with the bow and the tilt telescopic jib ; in the buffer spring is installed in the sleeve the boom a buffer , shock absorption and limit the role . Bumper also used hydraulic oil and gas combined way, this way of shock absorption, cushioning properties better than spring .

The next three years , or show a downward trend in the international shipbuilding industry

Since 2011 , China's shipbuilding industry suffered a widespread "winter" , the shipbuilding industry is not optimistic the three indicators ,overhead gantry crane shipbuilding capacity growth is slowing, new orders up sharply , orderbook also accelerated decline.
For imports of marine equipment in large quantities, batch and more, and most of it comes to handling characteristics of the business and the current CCC shipbuilding industry problems , inspection and quarantine departments recommend shipbuilding enterprises to take timely measures to deal with the following :
Recognize the direction of development , adjusting the industrial structure, conditions permitting , homogeneous small shipbuilding enterprises should carry out strategic alliances , complementary advantages , the formation mechanism of competition unanimously , increase bargaining power.
Improve the technical level , and enhance the capability of independent innovation . Increase LNG carriers ,eot crane large marine equipment, high value-added production capacity, improve the overall competitiveness of shipbuilding industry , from cost advantages and product advantages to technical changes .
Emphasis on international shipbuilding new codes, standards affecting the shipbuilding industry . Carefully combined saving and energy-saving requirements to develop new ship, to avoid falling into the trap of technical barriers .
Strengthen production management , improve production efficiency. Avoid the manufacturing cycle , product quality problems led to difficulties in delivery of the ship . At the same time , strengthen the production and meticulous management , to take to improve labor productivity, promote technological progress , reduce procurement costs, improve utilization of steel , reducing energy consumption and other measures to improve profitability .
Do everything possible to ensure delivery of the ship , go all orders . Highly concerned about the container ship , LNG ships, multipurpose vessels , special vessels and marine engineering equipment and other areas of market opportunities.
Strengthen cooperation between banks and explore new financing. Vigorously carry out the ship financial leasing companies, the use of funds to establish shipbuilding industrial chain financing model .
It should be noted that the next three years will show a downward trend in the international shipbuilding industry is expected to pick up gradually until after 2015 , which is Forced Chinese shipbuilding industry to achieve leapfrog development opportunities. On the one hand , despite the downturn in the market for bulk carriers and oil tankers ,bridge gantry crane but the high value-added ships , energy-saving ships, marine engineering equipment orders have not been affected , but there was a substantial upgrade ; hand, new ship also means the end of peak demand the peak of the upcoming ship repair , shipbuilding industry will be the future has tremendous business opportunities , with the advantages of the port to implement shipbuilding industry cluster development , but also the development of domestic and international shipping industry, a successful model . Domestic shipbuilding enterprises should take timely measures to deal with the crisis in the industry , to seize the opportunities which bears , changing industrial structure, enhance the technical level, to achieve " shipbuilding power," the goal.

2013 China Industrial Automation Equipment Development Trend Analysis

With the deepening of social information , key industries critical task will increasingly rely on industrial machines,gantry crane and to IPC -based low-cost industrial control automation are becoming mainstream , local industrial machine manufacturers and the attention degree increasingly high. With electric power, metallurgy , petrochemical, environmental protection, transportation , construction and other industries developed rapidly, from a digital set-top boxes for home use , digital TV, to the bank teller , highway toll collection system , gas station management , manufacturing production line control , finance, government , defense and other industries increasing demand for information technology , a large demand for IPC , IPC market prospect is very broad.


First, the development trend analysis
 ( 1 ) specialized
 DCS is more suitable for the respective fields of application ,bridge gantry crane it is necessary to further understand the professional technology and application requirements, such as nuclear power plants in order to gradually form this S, change drill DGS, glass and cement DCS DCS and other .
 ( 2 ) to an integrated direction
 Because standardized data communication lines and communication networks, the various single ( multi ) loop controller , PLC, industrial ratio , NC and other industrial equipment constitutes a large system to meet the requirements of factory automation , and adapt to the trend of opening .
 ( 3 ) to the intelligent direction
 Because database systems, reasoning functions such as development, particularly in knowledge-based systems (KBS) and expert system (ES) applications, such as self-learning control , remote diagnostics and look for Excellence , artificial intelligence will be implemented at all levels in the DCS . And FF Fieldbus similar to microprocessor-based smart devices, such as intelligent I / O intelligent PID control, intelligent sensors, transmitters , actuators , intelligent human interfaces and programmable regulator has emerged.
 ( 4 ) Industrial PC technology
 Since S Gong became a big part of this trend , PC as the DCS operator station or node machine has been very common . PC-PLC, PC-S, 19, Pc-Nc so is Pc-Dcs pioneer .

Two , IPC Market Distribution


At present, the T- controlling machine supply channels mainly from China Taiwan and the mainland manufacturers, foreign products after years of market grappling , due to high costs , high prices, service difficult , is now completely out of the domestic market. At present, the domestic IT industry, research and development, processing technology to constantly improve ; kinds of chips and a variety of devices , cattle production :hoist gantry crane did not prepare an equal footing in the international market is basically optional ; software resources portability can save a lot of manpower and material resources. In these favorable conditions, some domestic manufacturers seize the opportunity to rise rapidly , the use of local competitive advantages in foreign brands will gradually squeeze the domestic labor market. Some businesses more than 100% per year growth rate of assets , utmost in the domestic industrial market, and has successfully entered the international labor market.

Industrial sector 's products and technology is very special , are intermediate products for other industries to provide reliable , embedded , intelligent industrial computer . With the deepening of social information , key industries critical task will increasingly rely on industrial machines, and to IPC -based low-cost industrial control automation are becoming mainstream , local industrial machine manufacturers and the attention degree increasingly high. With electric power, metallurgy , petrochemical, environmental protection, transportation , construction and other industries developed rapidly, from a digital set-top boxes for home use , digital TV,Steel crane to the bank teller , highway toll collection system , gas station management , manufacturing production line control , finance, government , defense and other industries increasing demand for information technology , a large demand for IPC , IPC market prospect is very broad.

China's construction crane industry status and future development of

Address the issue , to strengthen self-reflection

At present, China's construction  jib crane  industry affected by overcapacity , marketing tools are not standardized, product homogeneity and rising operating costs and other unfavorable factors, led to a price war industry , corporate capital chain issues grim , profitability is becoming increasingly difficult problems, leading enterprises operating deteriorating SMEs face life and death decisions , industry operating pressures continue to increase . Industries and enterprises to rationally analyze and address these issues resolved quickly .

Connotation and denotation , seeking to develop the path

2012 , China's construction crane industry in the market ups and difficulties ahead . Construction  Steel crane  industry is facing a new shuffle , how in the fierce competition in the market through difficult times , become the primary task of the current strategic development .

Organic growth is sustainable and stable development foundation

Increase product core technology research and optimize the product structure , improve product quality , foster product innovation capabilities, platform technology, security technology, environmental technology , energy technology and other fields to establish a common platform for the industry , vigorously develop innovative , energy saving, reduction rows of high-end products . Enhanced ability to resist risks strengthen the industry 's scientific judgment and market forecasts, and industry self- consciously combined with increased operational capacity to resist risks . Optimize production patterns and resource allocation should increase technical and supporting platform development and the transformation of the efforts to reduce manufacturing costs and improve after-market service capabilities. Strengthen the industry and corporate synergies and avoid vicious market competition and price Rush .

Extensive development is the future development of enterprises powerful boosters

Innovation and continuous improvement to enhance marketing management marketing channel construction system, increase efforts to support the agents . Strengthening fine management , improve service chain , enhance market service efforts . Differences based on user demand market segments , improve product user satisfaction. Constantly improve the product chain according to changes in market demand and strategic development needs ,overhead gantry crane increase capital operation and related areas of mergers and acquisitions , rapid expansion of product lines and customer access to resources in order to obtain a strong competitive advantage .

Actively explore overseas markets through a diversified, international road of development , and actively to infrastructure demand in emerging countries with economies expand markets, to further establish and improve the products and service chain , enhance corporate competitiveness in international markets .

Chinese crane industry worldwide regional market status

Global crane market (except China) total capacity of about 15,000 units. Among emerging market development speed, such as Brazil, Russia, etc.; Chinese bridge crane  is gradually towards European markets, on a global scale with the International Crane compete with Taiwan, China Crane in product technology, production capacity, sales channels, overseas distribution already has the international market condition.

Based on the overall market volume,bridge gantry crane market economy status and stage of growth, nature of the market can be divided into three categories:

Potential market: large capacity, slow growth, such as the Middle East and Africa;

Growth markets: large capacity, high growth, such as Brazil, Russia, India, China, the CIS;

Mature markets: large capacity,gantry crane changes in the growth and stability, such as Europe, North America and Australia.

Chinese crane industry competitiveness in the regional market Market Situation

1) Technical aspects
 
At present, the Chinese eot crane  through years of accumulated technology, product technology matures, major product technology to large-scale, high-speed and dedicated development, standardization and diversification to the general technology development, product performance progressive realization of automation, intelligent and digitization has have the ability to participate in international competition.
 2) production capacity
 Domestic crane market demand exceeds the sum of the market demand in other regions around the world, of which more than 90% of production capacity is driven by Chinese demand.  hoist gantry crane  domestic enterprises have been efforts to expand exports share, the target is to achieve market share of 30 to 35%. Currently China crane capacity far exceeds global demand, 2011 annual capacity up to 40,000 units.
 3) sales channels
 Global marketing network, personnel and equipment for gradual improvement. Chinese enterprises have gradually in sales of large cranes and sales network in areas without creating a new sales outlets around the world looking for new dealers, and the corresponding complete perfect global sales and service network, in order to lay the foundation for the  hoist crane  industry globalization.
 4) the pace of internationalization
 Gradually accelerated the pace of internationalization, construction machinery exports in 2015 will reach 20 billion U.S. dollars. Currently, dozens of companies to look into overseas markets, mergers and acquisitions continue to improve the industrial chain, to expand market share, enhance competitiveness, increasing exports, and constantly win billions of dollars in export large orders, record industry history record.

Chinese crane industry product quality status

In recent years, in order to meet market demand, domestic enterprises constantly adjust product structure, improve the level of product technology and continuously improve product quality, to provide users with high-quality products, but still mainly targeted at the low-end market, compared with foreign construction  overhead bridge crane  quality there are still large gaps, mainly reflected in the following aspects:

(1) product design sophistication uneven

Domestic construction cranes in appearance compared with foreign products, humane, product reliability, ease of installation, detail design some gaps. Domestic construction crane in appearance, humane, reliability, and other fine design mixed.

(2) the level of technology and assembly technology varies greatly

Precision-made  overhead gantry crane   materials, the appearance of coating, the flatness of the main cover and key parts of the weld and assembly technology level compared with foreign products have a certain gap.

Manufacturing and assembling technical level varies greatly, weld appearance of rough irregular, paint quality, but off, poor paint adhesion and corrosion resistance.

(3) the stability of the product quality is poor

Stability and quality of domestic parts larger than the gap with foreign products, affecting product life, such as the hydraulic system leakage, abnormal noise; electrical component aging, poor contact, malfunction; institutions like oil spills, abnormal sound, easy to maneuver , unreliable; bridge box category oil spills, leaks, broken teeth, badly operated; chambers and exterior parts leaking weld cracking,bridge gantry crane sealing off the aging and so on. Such as engine life abroad as 8000h, while China only 3000h; foreign service life of the hydraulic cylinder 100 to 200 million, while China is only 60 to 80 million times.

Crane product quality problems

Crane product quality problems,hoist gantry crane lead to the following conditions occur:


(1) out of the market due to product quality issues

1930s, the Japanese construction machinery in the process of expanding the international market as product quality is not reliable, the lack of spare parts, no maintenance service system, making the Japanese construction machinery into the U.S. market,overhead gantry crane bad reputation, resulting in product delisting.

(2) product quality fine compensation for the international market

20 In the 1990s, South Korea construction machinery into the international market, due to product quality caused damages, the majority of product returns, a lot of the claim.

(3) quality of products on the international market, the adverse impact

Some domestic construction machinery export products due to quality problems arise batches, made ​​in China in the international community to have a negative impact, "Made in China" image cast a shadow of cheap and shoddy.

"Product quality" wake-up call to us, bridge gantry crane  enterprises to enter the international market must ensure that the product quality, to avoid longer follow Japan, Korea and China construction machinery into the international market formula.

Tower crane technology trends (3)

In product development to implement experimental verification.

Experimental validation of new products the most direct way is to improve product reliability and safety the most important means of inspection.

Reliability and safety of the product is mainly determined by the parts is parts safety and reliability of expression.hoist gantry crane Parts of the reliability and safety, reliability and safety of naturally high. Therefore, a large tower bridge crane  manufacturer, invested a lot of financial and material resources to build their own experimental field, such as the structure and organization Potain experimental field in the 1980s, has been basically completed, a total area of ​​170,000 m2, with a variety of experiments stand over a hundred kinds of products subject to harsh conditions true and verify eligibility to the factory.bridge gantry crane Zoomlion is currently building its own tower cranes special experimental base.

Tower crane technology trends (2)

In recent years, with the development of technology tower crane, tower crane model specifications continuous improvement, performance, quality and continuous improvement, tower overhead gantry crane s in addition to meet its secure, reliable and efficient basic performance, tends to be more intelligent and green . In China, Zoomlion is undoubtedly the most advanced technology enterprise, the following points highlight the latest technology trends. Especially international large enterprises the most advanced technology.


Intelligent control.

With digital, integrated, intelligent rapid development of technology, high reliability, low power consumption, miniaturization, integration, digitization of various hydraulic, mechanical and electrical components in a tower crane have been widely used, so that the drive and control system small size, light weight, compact structure. The control means, variable speed, security and surveillance systems, remote maintenance systems, automatic fault diagnosis system and other widely used to achieve a tower eot crane  operations process control, automatic display and recording, remote remote control, etc., to ensure the tower the safe use of cranes and real-time monitoring, reducing the control points of failure and improve the reliability of tower crane, tower crane industry significantly enhance the management level.


Manufacture green.

Foreign tower bridge gantry crane s are designed to take full account of the common parts, modularity, high degree of intensification of component parts, suitable for mass production. Bulk of the parts from raw material pre-treatment, cutting, welding, machining, assembly, production lines are used to paint, so that not only improves the utilization of materials, parts commonality, product quality and aesthetics, and ease of management, reduce pollution and cost savings.

Tower crane technology trends (1)

Design method precision.

Deepening the development of computer technology has changed the tower crane design. Finite element technique, fatigue analysis, dynamic simulation analysis extensive application of tower  gantry crane  design calculations, stress analysis more precise, tower crane parts, structure design more reasonable; several powerful tower crane manufacturer, has their superior design capabilities, they take advantage of the development of tower cranes parametric design special software to make the tower crane design to further optimize the direction of advance, effectively improve tower crane product safety, reliability, energy saving effect while greatly shorten product development cycles,bridge gantry crane improve competitiveness.


Modular components.

The modular design may slight increase in manufacturing costs, but it can not only improve the yield and quality, but also can reduce management costs, but also correspondingly reduce the user acquisition costs. Models such as A and B models have many structural components (such as the standard section and the boom sections, the balance arm section) is generic, then the user can buy less common structure, staggered use of these common parts may idle , thereby reducing the cost of ownership. Thus, the modular design is the inevitable trend of development of tower cranes, tower hoist gantry crane  many international manufacturers such as Liebherr, Potain, Terex, Wolffkran are all modular design of the model.

Lifting machinery and other industries need to support a large number of high-quality steel as a raw material

Construction machinery industry leading products including concrete machinery, road construction machinery, mining machinery,overhead gantry crane piling machinery, lifting machinery and wind power equipment such as a full range of products. Wide range of products in the industry are the need to support a large number of high-quality steel as raw material.

Iron and steel industry as excavators, rollers, rotary drilling rig, loaders,  jib crane  , concrete pumps and other construction machinery products are the main suppliers of raw materials, it is necessary to strengthen inter-sectoral cooperation, and promote the healthy development of the two industries, in order to achieve win-win situation. On the one hand, the construction machinery industry can help the steel industry to digest excess capacity; the other hand, the quality of construction machinery high demand for steel products, iron and steel enterprises can promote technological innovation to improve steel quality, so as to promote the sound development of the industry.

In this regard, some suggestions: First, the establishment of an information exchange platform, to strengthen inter-industry exchanges. Formed steel production development and construction machinery industry, seamless steel demand information; establish regular inter-industry discussion and consultation mechanisms, thematic studies on major issues, joint development of the industry to address the constraints of the problem.

Second is to strengthen industry research, providing valuable consulting services. Integration of two industry-related information, including changes in the steel market, steel, construction machinery industry demand for construction machinery enterprises and steel companies, providing a valuable reference information services.

Three is to guide the steel industry, engineering machinery enterprises to strengthen cooperation and establish a substantive strategic partnership in steel pretreatment, processing,Steel crane distribution and other areas of mutual shareholding, forming a true strategic alliance. Joint research and design, regular exchange of visits, and timely information about construction machinery enterprises demand for steel products, steel products quality problems feedback, so that mutual support and joint development.

Fourth is to strengthen go out and work together to develop overseas markets. Steel industry can bring in terms of going further develop the overseas market of construction machinery.

Bridge crane related presentations

    Here to tell you  overhead bridge crane  related issues, so that we know more about:
Overhead bridge crane is the bridge in orbit a bridge crane. Bridge crane bridge laying on both sides along the elevated tracks run vertically, lifting trolley along the track on the bridge laying sideways to form a rectangle scope of work, you can take advantage of the space under the bridge lifting materials, not hampered by ground equipment.
Bridge crane is widely used in indoor and outdoor warehouses, factories, docks and open storage yard, etc..  hoist crane  can be divided into ordinary, simple beam bridge crane bridge crane and metallurgical dedicated three.
General overhead cranes generally lifting trolley bridge operating agencies, bridge metal structures. Lifting trolley and the hoisting mechanism, trolley run institutions and small frame of three parts.
Lifting mechanism includes a motor, brake, reducer, drum and pulley. Motor through reducer, driving drum rotation, so that the wire rope around the drum or from a roll down to lift heavy loads.jib crane Small frame and mounting bracket is lifting mechanism and trolley run institutions and other parts of the rack, usually welded structure.

Loosening of crane tracks

  Often encountered in the inspection  hoist gantry crane  rail carts loose issues, from the following analysis of the reasons for this phenomenon:
One, carts are not synchronized
  1, both sides of the wheel brake carts have successively
       Has braking system makes the wheel carts parked on both sides of the time bias, resulting in the pendulum bridge, the situation will be severe bite rail phenomenon. At this point, the wheels will be in carts carts track along the main beam is generated perpendicular to the friction of the cart track, prompting the cart track loose.
  2, the side of the brake, brake or no obvious side
       In this case, the carts start or stop the system tray will see significant torsion moment, the brake is not obvious side, the end beam will swing back and forth, the cart wheel flange and rail side thereof,overhead gantry crane generate a horizontal lateral force, causing flange and rail friction, leading to loose track. So while one side of the braking effect is obvious in the torsion process to act as "support", in orbit will produce friction along the track direction, if not timely repair, rail will gradually loose.
Second, the bridge uneven
       Likely to cause uneven tray carts four wheels not in the same plane, the run-time generated "three legs" and so on. Runtime carts will be "bumpy", severe cases occur throat rail phenomenon, generating friction along the track direction, leading to the track and plate loose.
Three, wheel problem
  1, horizontal deflection wheels. Deformation due to the bridge, prompting the end of the horizontal beam bending, resulting in horizontal deflection wheels or wheel installation tolerance level already skewed tolerance.
  2, the wheel vertical deflection. Deformation due to the bridge, causing the wheel vertical deviation tolerance. Installation should pay attention to the same set of wheels are slightly skewed to the outside, causing the bridge to reduce wheel bearing rear vertical deflection.
  3, two equal diameter capstan. The  bridge gantry crane  operation, the speed is not the same as the left and right.
  4, the front and rear wheels are not run along the same line. Bridge span due to deformation caused by excessive bias or diagonal, the front and rear wheels can run on the same straight line.

Inadequate crane industry: basic components, basic research and development lags behind.

Through research and development, technological innovation, the introduction of digestion, China tower bridge gantry crane  business tools and accessories designed production capacity have made great progress, advanced computer design, microelectronic technology, remote monitoring and other technologies are tower crane has been applied. But the Chinese tower crane technical performance, production quality, variety and reliability models, compared with developed countries, there are still gaps, mainly reflected in: the reliability of domestic components, such as electrical components, hydraulic components, transmission components; process equipment, laboratory equipment and testing means not complete; basic research is not deep enough, such as the local structure of quantitative analysis and reliability studies. This has affected our whole product quality and reliability, increased accidents.

In addition, the transmission mechanism configured low tower  eot crane  has become a constraint to improve technical performance bottleneck, the host development are severely constrained. Transmission mechanism to use more than the backward speed control mode, the impact of large speed range is narrow. Hoisting mechanism is still much lower transmission efficiency using a soft tooth cylindrical gear reducer, using pole squirrel cage motor speed, two-speed motor winding plus eddy current brake governor, RCS dual motor speed; slewing mechanism to use more around line speed motor plus fluid coupling;hoist gantry crane luffing mechanism of multi-use multi-speed motor speed.

Chinese tower crane continuously enhance international competitiveness.

Since the 2008 financial crisis, the U.S. and European markets to drop sharply; And thanks to the accelerated process of urbanization in China, China tower  hoist gantry crane  market ushered in a rapid growth phase. At present, China has more than 400 tower crane manufacturer, can produce more than 100 kinds of models of the tower crane, to achieve annual sales of 100,000 units.

Domestic tower structural analysis of the product gradually applied accurate calculation method, by the computer to the tower body parts for strength, stiffness, stability and overall stability calculations, to enhance the precision and design capabilities. Control systems, PLC systems, transformation and frequency conversion stepless speed, fault self-diagnosis monitoring, field bus, remote control and other technology has been in the tower  Steel crane  has been widely applied to improve tower crane performance and security. Basic research, the strength of enterprises, the construction of a complete laboratory, through the new technologies, new structures for quantitative analysis and assessment, improve the reliability of the tower crane.

Chinese tower crane manufacturing industry chain has been formed and matured, the quality has reached the international advanced level, while foreign companies tower crane products are basically localized. Meanwhile, the Chinese tower crane industry independent innovation capability by leaps and bounds. Chinese tower crane export areas more than 144 countries and regions, only 2012 exports to more than 300 million U.S. dollars. China has become the world tower crane tower crane indispensable part.

Particularly the European Union through the international industry standard tower crane in-depth research, to enhance the industry's in-depth understanding of the tower crane, thereby increasing the level of the overall design of the tower crane, the Chinese tower  overhead gantry crane  product performance and security in Europe and America market access threshold.

China the status of tower cranes

Chinese tower crane began in the 1950s. Looking at the 60-year history, China tower crane industry from scratch,overhead bridge crane from small to large, and gradually formed a relatively complete system and more complete spectrum, tower crane industry has also become China's construction machinery industry the fastest growing one. Today, China has been able to produce 100 kN to 52,000 kN m m tower crane, construction will not only meet the domestic demand, but also are exported to all over the world, especially in small quantities are exported to European and American countries and regions. China has become the world's largest producer of tower cranes.

A status quo

Through 60 years of efforts, China tower  bridge gantry crane  industry in the industrial scale, independent innovation, restructuring, etc. have achieved remarkable results.

(1) industry continues to expand rapidly.

Since the 1990s, China tower crane industry has been rapid development, especially in recent years, research and development capabilities continue to increase, the various forms of tower crane product spectrum increasingly sophisticated, the tower crane production and sales continued to climb, China has become the world's civil tower crane largest producer, is the world's largest tower crane use of power.

2007 China's total sales of tower crane 31020 units, compared with 2006 increased by 59.72%, domestic tower  overhead gantry crane  holdings exceed 10 million units. Since then China tower crane market has entered a rapid development stage one, as of 2012 the domestic tower crane ownership has more than 300,000 units, with an annual growth rate of over 25%.

New bridge crane lightweight design is concerned with energy-saving technology

As a chemical, nuclear, construction and other areas of essential machinery and equipment, for decades, there has been the whole of the  bridge gantry crane  itself weight, more energy, lifting height and low vulnerability. Many domestic crane manufacturer, has been engaged in research and innovation, but most manufacturers to create

The focus of the new process improvements on the main beam, a large crane structure, manufacturing costs and higher energy consumption defects still hard to change.

How to break the "short board", the implementation of competitive differentiation? Bump Heavy Industries will look aimed at "lightweight, energy-saving, intelligent crane." Which is what the current domestic  eot crane  industry has not yet overcome the technical problems.

Since 2008, the bump Heavy Industries began implementing the "energy-saving lightweight design crane" development plan. After four years of research and development, Heavy bump key components for cranes that lift trolley, electric hoist and crane girders, etc. of innovation and improvement. "Simply, is the

The weight of these components down, the lift going up and achieve intelligent control. "Bump Heavy chairman Zhu Jianjun said.

Lifting crane trolley is hidden in the core of the "engine." Structure in the conventional crane, a lifting capacity of 100 tons lifting trolley, its own weight is 30 tons. The "heavy" burden direct result of the  hoist gantry crane  in size, weight, energy consumption, the "

Backward. "

How to reduce weight even lifting the car, but also improve work efficiency? Bump Heavy flexible introduction more than 10 technical experts, lightweight lifting trolley for research and development. More than two years of exploration, not only to achieve the lifting trolley remote control while lifting force according to the situation on the start

Weight trolley wheel material, such as heat treatment process has been redesigned, lifting the car a new look.

Data show that the practical application of the same lifting height of crane trolley, reduce its weight by 55%, lifting power consumption reduced by half, the volume is significantly reduced. With the most advanced compared to similar products, the new car and light weight lifting by 9.2%. At present, this innovative technology has been applied

National invention patent.

Overhead crane in accordance with current domestic market holdings calculated that if all use of this new lightweight energy bump crane, the annual saving for the consumer with more than 500 million kwh, equivalent to the average daily power generation of Three Gorges power station more than 2 times.

Crane industry users need to have basic knowledge

 Construction engineering machinery products more harsh working conditions, machine failure is common.gantry crane Some product quality problems, some improper use ...... but no matter what the problem is, are allowing companies struggling to cope with disputes; For the user, the loss of time and money is no longer

France to restore. To avoid unnecessary disputes when try to avoid, rather than disputes arising from the use of the product, the user and the enterprise or agency in court, as both sides will be more work done full and pro-active approach. The appeal of the enterprise is more common topic,jib crane mainly lies in the End

Good quality management and service sectors; appeal lies users need to take care of the machine.

    First, the user must have sufficient expertise, engineering machinery products generally expensive, at the time of purchase to carefully check the performance of the machine and wearing parts. Whether buying new models, still has some models, you must read the instruction manual carefully and carefully check

Investigation, in order to avoid the possibility of accidentally buy defective.

    Second, in addition to seriously listen to manufacturers to explain the product to use, but also carefully studied repair and maintenance instruction manual, and timely with the distributor or manufacturer service agreement. Fails, the user should promptly get in touch with the enterprise, to take the quickest way to solve the problem. Now

After a number of enterprises to establish a more perfect service examination system, from the user to the enterprise from the time of the problem, the relevant departments have begun to service engineers to supervise and urge them to improve work efficiency.

    Third, the user must possess the necessary skills,overhead gantry crane equipment maintenance, after-sales service to make it easier for businesses and consumers to save time.

    Fourth, the operator should possess professional qualifications of the personnel to use and routine maintenance. As a result of improper use of product failures are common, such cases do not belong to the scope of rights. This will not only delay the use of the user, but also to manufacturers resulting in unnecessary trouble. In order to avoid

Avoid this from happening, we must strengthen the operator's skills training, obtaining the necessary operating certificate to posts.

    Fifth, we should grasp the law as a weapon. Encounter difficult problem, indeed proven responsibility manufacturers, but manufacturers mediation fails, the user should be timely recourse to consumer protection associations, if necessary, should take legal action.

    Xieyanmache proposals do not want to weaken the user to seek their own awareness of rights protection, but rather to promote communication and cooperation with the user enterprise, and strive in the most convenient way to solve the real problems occur