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.
bridge gantry crane
2013年9月8日星期日
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.
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 .
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 .
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 .
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 !
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 !
2013年9月6日星期五
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 .
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 .
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.
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.
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.
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