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 .

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.

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.

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 .

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 .

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.

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

Southeast ---- Chinese construction machinery exports popular area

In 2012, the Chinese people in Southeast Asia have a new understanding of its not because of the tension between the Philippines,jib crane Southeast Asia and Japan is not because the steel market of the dispute, but along with housing construction, roads, power plants and other infrastructure projects continue to be launched Southeast Asia's rapid economic growth, China has become a hot spot for exports of construction machinery. If the world economy are strong, and Southeast Asian markets may not be so eye-catching. The face of the European debt crisis, the Spanish real estate bubble in the entire world economy cope with the Depression, when the sudden emergence of Southeast Asia,overhead gantry crane I believe, this is not just Chinese construction machinery enterprises, "cornucopia", is the world of construction machinery enterprises competing to compete in the new battlefield.
Southeast Asia, Southeast Asia, appeared late in World War II a new area name, owner, including Vietnam, Laos, Cambodia, Thailand, Myanmar, Malaysia, Singapore, Indonesia, Brunei, the Philippines, East Timor, May 20, 2002, democratic Republic of Timor-Leste was formally established in 11 countries,Steel crane with an area of about 4,570,000 square kilometers, a population of about 560 million. Is one such area, has become a Chinese construction machinery exports popular area.

China has become an important global crane market

  With the Chinese economy and the rapid development of infrastructure, led the Chinese crane market's rapid development, China has become an important global crane market. The rapid development of  hoist crane  , lifting equipment is stimulated by market boom, lifting equipment development to bring more power source.
     According to the analysis, in recent years, especially in areas of the energy industry to develop, led the Chinese crane industry's continued healthy development, it is driven by a large number of extremely powerful lifting equipment construction enterprises. China lifting industry has emerged a group with considerable scale and strong competitive large lifting equipment companies; these lifting equipment manufacturing enterprises, but also with Chinese crane market, overseas expansion into foreign markets is also positive.
     Lifting equipment industry and the  eot crane  industry can be said that mutual promotion and mutual development. China lifting equipment in the field of rapid development, but also for the Chinese crane industry has supported the development. At present the domestic crane market, brings together almost all of the world-renowned manufacturers. Many foreign brands have a large crane assembly manufacturing base in the country to build, it can be said is also very optimistic about the strength of domestic enterprises lifting equipment.
     Large foreign lifting equipment to seize the Chinese market, coupled with the escalating demand for Chinese users, for local businesses and lifting equipment lifting machinery enterprises, it is an opportunity and a challenge. There is competition, will progress.jib crane Local enterprises in response to the lifting equipment and lifting equipment market changes in the products and technologies are also constantly innovate.

Chinese tower crane favorable factors and constraints coexist

  In recent years, China tower crane export volume increased, the quality has been improved. But its development is still a lot of constraints, in particular those affecting China tower  hoist gantry crane  for further export. Chinese tower crane exports significantly favorable factors: one is the Chinese tower crane short lead times, low price; hand in recent years, China tower crane export development quickly; third aspect is that China has strengthened lifting machinery industry development strategy and the overall planning; Fourth, some tower crane manufacturers have formed the core competitiveness of enterprises; Fifth, accelerate the establishment of industry self-regulatory organization coordinating mechanism. Strengthen the product into the "mainstream market" certification.
     Chinese tower crane development has two constraints:
     A: Chinese tower Steel crane  in brand building requires further efforts, in particular with international companies compared to similar products there are still some gaps.
     Two: service issues. Chinese tower crane training local agents of multinational enterprises and users obviously inadequate, some less able to service agents. Agents as a bridge connecting manufacturers and users, to promote the prosperity and development of the tower  jib crane  industry plays an extremely important role and should actively promote and improve after-sales service system agents.
     Three: people-oriented Chinese enterprises safety awareness, service consciousness lags far behind developed countries. Some warning signs pasted improper location, not a security warning; various protective facility design and set up either poor, unsightly appearance.bridge crane Such problems are often caused because of safety consciousness, and it does not require too much cost solution.

Crane technical operation

A crane workplaces should be smooth and firm, you should check whether it is the foundation endurance requirements. Operators should be familiar with the work environment, check the mechanical work area, turning space accessibility and other insecurity.
Two  bridge gantry crane  at work should be carefully checked before each part, limit switches, safety devices, braking performance is sensitive, and the empty load test run, confirm the normal behind the prospective work.
Third, before lifting operations, the operator should be aware of lifting operations programs and related issues and unify their thinking and commanding officers. The operator must closely cooperate with the commanding officers, commanding officers in strict accordance with the signals to operate. Command signal unclear if found or an error, the right to refuse to perform. Other staff are issued for danger signals, but also should pay attention to. Warning whistle before crane operation.
Fourth, non- gantry crane  overload operation, oblique hanging and pull the hanging. Allowed to be hanging heavy weight lifting unclear. Prohibited or condensate lifting underground burial in the ground or objects on the device.
Fifth, in the job, it was prohibited under heavy lifting, boom next strictly prohibited.
Six, manned strictly prohibited hook, lifting objects over someone is strictly prohibited.
Seven, crane operation, maintenance and adjustment work is strictly prohibited personnel.
Eight, when lifting heavy banding firm. Prohibit stacked or hung on a sporadic heavy objects. Place heavy objects on the situation to the attention of the ground, to prevent tilting skew. Sporadic materials and articles must hoists or rope lashing firmly before lifting. Lifting explosive and other dangerous goods, safety measures must be taken.
Nine, lifting weights, weight hook vertically through the center of gravity should be. First trial cranes, heavy lifting from the ground 200 mm should be stopped and checked; crane stability, braking reliability, weight balance, lashing the firmness. Heavy lifting, try to avoid decentralization boom, must be put in, the first weight down, and put the boom.
Ten, as with dual-lift crane, the two cars arm should maintain a certain distance (to prevent head collide and coincide with the center of gravity caused by lifting emphasis) have special unity of command, slowly, so closely coordinated action, weight should not exceed two cranes from the weight of the sum of the nominal 75% less load on each crane bear its nominal weight of 80%.
Eleven, heavy lifting and rotation, the speed should be uniform, action should be smooth. Heavy falls, must slow light up. Prevention of sudden braking. Diaoqi weight prohibiting the free fall. Job, pay close attention to the operating state of the hook and rope to let roll back bar and so on.
Twelve, rotary or landing shall not reverse lever is not completely stopped before the action. Strictly prohibited to use way to fight anti-car brake achieve the purpose.
Thirteen, lifting operations, in case of emergency, should promptly take the necessary measures.
Fourteen, job, arm elevation shall not exceed the maximum original requirements. If no data are available at the maximum over 75 degrees is appropriate. Under certain extent when lifting heavy objects, such as exceeding the rated total weight, rotation speed should be slow. Heavy lifting arm and arm elevation large, heavy objects should be first unloaded on the ground, and keep rope taut, the lower arm and then decoupled. Except in special cases, try not to use 30. The following angles.
Fifteen,  jib crane  downtime or rest, should heavy fall to the ground, not on the hook hanging heavy objects.
Sixteen, rain and snow work, in order to prevent moisture brake failure, particular emphasis should be suspended through a trial to prove reliable brakes only after work. Rain, snow-fall more slowly.
Seventeen, outdoor operations, heavy rain, fog, and 6 and 6 above winds affect safety, they should stop operation.

What crane safety device

To ensure safe and reliable lifting operations,  jib crane  equipped with a better safety devices in order to unexpected circumstances, play a protective parts or alert the operator, and thus play a security role.

A hydraulic system, the pressure relief valve: inhibit loop abnormally high pressure in order to prevent damage to the hydraulic pumps and motors, and to prevent is overloaded.

2 luffing jib safety device: When the unexpected accident, boom luffing cylinder loop pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from work oil, the boom will not fall, thereby ensuring the safety of operation.

3 telescopic  eot crane  safety device: When unexpected accidents, telescopic boom cylinder circuit of the high-pressure hose or pipe burst or cut off, the hydraulic circuit balancing valves on the work, lock cylinder lower chamber from the working oil, the suspension will retract themselves, thus ensuring the safety of operation.

4 height limit device: hook up the required height to rise after touching limit hammer, turn the trip switch, "over round" indicator light that is bright, while cutting off the hook lifting, boom stretched out, hanging Arm volts to the operation of such action to ensure safety. Then just manipulate the hook down, boom boom retracted or looked up (to the Security side operation), etc. handle, lift the weight limit constraint, the operation returns to normal. For special occasions, such as still need to make a small amount of over-winding operation, press the release button on the meter box, this time limit will be lifted role, but this time the operation must be very careful to prevent accidents.

5 leg locking device: When unexpected accident occurred, leading to the leg vertical cylinder hoses or tubing rupture or cutting, the hydraulic system can be disabled with a two-way hydraulic lock cylinder two leg blocking pressure oil chamber, the branch Notations or throw the legs,bridge crane thereby ensuring the safety of the lifting operation.

6 from the weight indicator: Starting weight indicator is set in the basic arm together side (ie, the right side of the cab), the operator sitting in the control room can be clearly observed, can accurately indicate the boom elevation and the corresponding conditions allow cranes rated capacity.

7 Lifting Characteristics Table: Set in the control room on the front side of the lower wall, the table lists the various arm lengths and a variety of work rate and the nominal weight lifting height for operation inspection. Lifting operation, must not exceed the values ​​specified in the table. To ensure safe and reliable lifting operations,  Steel crane  equipped with a better safety devices in order to unexpected circumstances, play a protective parts or alert the operator, and thus play a security role.

Base does not meet the requirements to cause the accident

a, failure to specification requirements for ground endurance test, because of the foundation bearing capacity is not caused by tower  bridge gantry crane  overturning
b, not request brochures construction, the foundation is too small for the tower crane various working conditions Stability
c, bolt homemade reach specification requirements, bolt fracture initiation tower crane overturning
d, anchor bolts and foundation welded steel. Due to bolt material mostly 45 # or 40Cr, welding parts prone to brittle fracture

1.4 tower crane attached undue cause accidents

a, the attachment point above the tower  overhead gantry crane  independent lifting height exceeds specification requirements
         b, attached to the pole,jib crane attached to pitch without calculation, design arbitrarily increase

Lifting type of experiment and model (type) of the concept and its specific use

To clarify the issue of lifting type of experiment, just above explanation is not enough, the foundation of the problem is to clarify what is the type of experiment clearly? What type of experiment should I do? About the first question, after a research,jib crane I think that type of experiment is equivalent new product before it is mass production type of recognition, more precisely, a new product should be on the recognition of new models; Well, what is the model significance does it have? It should be said, the most basic models with lifting force layout pieces on top, and the choice of the primary data related to the primary organization and selection (include electrical system) equipment related, that is, only the elements of change, from the The models can be heavy machinery that has changed; establish if these ideas, then the type of experiment they should do according to models. So, models and how to show it? It should be said, one model can be used to indicate a type. The next question is what type of experiment is in accordance with category (type) to do it, still should follow models (type) to do it? Imagine,bridge crane if you do not follow models (type) do but follow types (ie type) to do, whether you can reach the type of experiment intentions? I think, you can not, reason: First, in the same category (type) in the presence of a variety of models (types), during which one model (type) after a type of experiment does not prove that another model (type) it must can pass type of experiment, but can not prove that during one model (type) after a type of experiment to explain the whole of this category (type) will be able to pass model experiments, the truth about the models from above (type) sense can be prove; Second, the State Council "special equipment catalog" (National Quality pot [2004] No. 31) in the category (type) layer of the primary lifting machinery in accordance with the primary distinguishing elements such as layout, you can not go down models (type ) on the distinction, otherwise too many levels, coupled with practical tasks, showing a new product is a new model, it will happen a new type, if the type is fixed, showing how to do new types? For encouraging the development of new products, the type can not be fixed, it should be rolled out and set up under abnormal conditions. According to the above thinking, AQSIQ pot in the national quality inspection [2003] No. 305 document type is given a meaning and rules of lifting type of experiment with the product type specifications as the basic unit; increasingly clear after the order type The significance in the type of experiment took him Conditions expressed as: type is the primary layout, the primary force layout data and vital pieces of the same process, the primary organization fit Series models equipped with a pleading, code from the product categories (type),hoist crane the layout mode, the primary component parameters, and use letters, numbers or a combination thereof indicate. Since then, basically clear expression of the type and its methods. For specific product type experiments, specific pilot projects, content and pleading, the paper does not open narrative.

Electric overhead crane operating procedures

Now do the electric overhead Steel crane s procedures described below:
    1 The operator must go through specialized technical training of qualified and holds the device operating permit before operation. The operator must strictly comply with the relevant safety regulations and the shift system.
    (2) Workers should be strictly in accordance with the preceding provisions of lubricating grease, oil and keep fit, oil flow, oil standard (windows) eye-catching, oil cup clean.
    3 Check the transmission, steering mechanism, the size of car walking wheel, reel, hook, pulley, pin, wire rope for wear and damage to the office and check the track and within walking without obstacles.
    4 Check the signal bell, lights and lighting equipment is perfect, lifting height and walking test limit switches, as well as the brake action is sensitive and reliable.
    5 when the hook in the lower position, the rope should be left on the roll at least twice or more. Wear and corrosion resistance over the surface of the wire rope diameter of more than 40% of one or a twist to break away from the root of the number of broken wires within more than 5% of cis-wound wire,overhead bridge crane steel wire around each of 10%, should be discontinued.
    6 job, just listen to one person commanding the driver, the driver and conductor should be obvious hand signals. Before lifting the driver should be ringing signal echoed into the crane in case of danger or failure, regardless of the signal from the bottom of who should be immediately stopped.
    7 The first hook should first try  jib crane , bridge crane will be removed from the ground 200 mm weight when doing brake test and confirm before lifting a good job. The process of moving, should make lifting weights all the way objects move above 0.5 m or more.
    8 crane lift, start, stop should be slow to prohibit the operation of a sudden change of direction. When the big, trolley close to the end, the application of the slowest speed, prohibit the use of stopper as a means to stop running.
    9 In case of a sudden power outage, a large voltage drop or equipment failure, the driver should immediately move to zero for all controllers, and pull the power switch, if the weight is hanging position should take measures to slow landing weight .
    10 prohibits heavy or hanging pull stayed buried in the sand and other objects of the workpiece.
    11 Two electric overhead traveling cranes on the same track must be more than 2 meters apart. To use a  eot crane  to promote another crane, first loosen the brake is pushed crane walking.
    12 wire rope should be regularly checked and oiled once every 15 days, oiled rope on the front of the grease should be cleaned debris, the oil is heated to about 60 ℃, in order to facilitate oil seep strand gap.
    13 The workers should hook after rising, the car stops at the end of the cab and check, cleaning equipment, do routine maintenance work for each of the operating handle (switch) is placed in neutral (zero), cut off the power switch, locked cab, reach neat, clean and safe.

Overhead crane new application - inverter

   Speaking of  bridge gantry crane , has a wide application in industrial and mining enterprises, mainly used to achieve the object of lifting and transport. Its frequency control system is mainly about the following characteristics:
1 The original four AC induction motor rotor winding shorted directly to the center, all the rotor circuit cables, resistors, contactors frequency sensitive rheostat and the abolition of all;
2 In the lane Tops 3 stainless steel control cabinet, protection class ip54. Frequency control cabinet a winch, big, car inverter + plc control cabinet one, a braking resistor cabinet, stainless steel cabinet to achieve the anti-corrosion, moisture, dust purpose alumina industry to adapt to the harsh corrosive dust working environment requirements;
3  jib crane  inverter selection abb acs800 series high performance inverter, inverter motor control winch hoist system software application macros, control large car motor drive system software use the standard application macros;
4.plc selection siemens s7-200 series plc issued control handle to open, stop, fast, slow, promotion, decentralization and other instructions, the corresponding plc issued a directive to control the drive Reversible and various speeds to reach the bridge crane's best control state;
5 braking torque generated by the drive when the eot crane  motor from the load receiving mechanical energy into electrical energy it into the inverter, resulting in DC pressure, the inverter must deal with this part of the energy, or the DC circuit the capacitor is overcharged, over-voltage protection action will make it stop running, so set the inverter DC circuit braking unit and braking resistor, the crane falling released during braking energy consumption in the braking resistor ;
6.plc according to the control program, the input control signal and enhanced decentralization and other instructions to complete various conditions  hoist crane  coordination and control;
7 linkage console has two, can multiple speed control.

Small crane installation and operation of Caution

Here is a small  jib crane  installation and operation of Caution

1, the machine installation should carefully check done: every little need to tie a rope over the first two, and the use of fixed spanner or wrench tightened.
2, the support bracket of the floor should be solid and reliable, can not shake; rack below the top tight vertical reinforcement with fir and beds wire for good, in order to prevent dangerous falls off the machine.
3, lift lifting should be noted that where the impact of its lifting operations around the outstretched templates, steel and other obstacles must be removed so that lifting operations can be unimpeded, unrestricted climb pull the card and so on.
4, high-voltage wire, cement, mortar mixer, should stay away from the  gantry crane  operating point 10 meters away, in order to prevent sand and gravel, bricks falling splashing phenomenon.
5, equipped with two professional operators, field operations, Lifting, lifting work and banned all other personnel to enter the workplace, lifting to one meter when others should immediately leave the field, such as the case should be prohibited access walkway to ensure safety . Operation must tie belt at waist and reinforced on, not in the body.
6, before the operations, should turn on the power, check the no-load operation is normal transmission parts,bridge gantry crane whether hanging behind a heavy pressure 6 Scale good pressure and observe the operating system is timely and reliable.
7, in case of low voltage, reduce the weight lifting and lifting heights to ensure that the motor load properly.

Gantry crane linkage console operating instructions

Gantry  eot crane   and other mechanical transmission parts mounted on the upper part of the hood enclosure, the drive mechanism is divided into single lever linkage control mechanism, grab double handle control mechanism, main and auxiliary hook double handle control mechanism, single handle and single handle control mechanism level control mechanism. Lever movement spur gears are used camshaft. Controllers are vertical layout camshaft, transmission part of the pivot bearing all in order to reduce the power loss.
        Gantry crane joystick is spherical. To avoid vibration and accidental collision because the crane control mechanism malfunction, the handle with zero self-locking devices. Composed by the two hemispheres of the handle up and down, only to mention Woxia hemisphere can leave the handle zero position actuator.
       Leave the zero position when the handle can loosen the lower hemisphere will continue to operate. If you often use reverse parking brake, feel manipulated inconvenience  gantry crane ,  can be re-instituted the lower hemisphere handle clockwise, so that the lower hemisphere fixed at lifting position, so zero self-locking device does not work. Six agencies under the rear handle with the zero-touch self-locking device.
       Gantry  jib crane  positioning ratchet 3 mm thick steel plate stamping of, and after treatment to obtain a higher wear resistance. There are six on the red ratchet positioning holes, positioning screws into the holes in different positions, you can determine the number of stalls joystick. In the left and six-speed range, the number of stalls can be arbitrarily selected. Positioning ratchet spring force can be adjusted, so that you can depending on the circumstances, in the sub-file clear premise, adjust the ratchet spring force so that the handle control force within the permitted range.

Gantry crane rope wear

When the operation wire in contact with other objects and a relative movement friction. In the mechanical, physical and chemical action, the surface of the rope continue to wear.gantry crane Wear is the most common injury rope way, generally divided into external wear, deformation wear and internal wear three cases. Figure 1 shows the wear of several monofilament cross-sectional shape.

1.1 External Wear
In the course of wire rope and the pulley groove in its outer periphery, drum wall, a top hook surface wear caused by the contact part of the external wear. The external worn rope diameter becomes thinner, the outer peripheral surface is polished fine steel. Figure 2 is a rope wear surface of two types.

External wear of the rope to bear the load of the wire cross-sectional area decreases, the rope breaking load is reduced accordingly. Figure 3 is obtained through the test wire diameter reduction rate and the reduction rate of the breaking load of the curve. As can be seen from the curve, one week wear worn worse than the whole week, it should be possible to make a single week of the wire to wear uniform wear full week. Entire length of the wire should be as far as possible uniform wear. Such as eot crane  wire rope used for the first medium-term, generally extend rope life 30% to 40%.

1.2 Deformation Wear
Due to vibration, impact caused by collision damage rope surface, called deformation wear, which is a phenomenon of partial wear. If the surface of the wire rope drum impact by other objects, crane hoisting rope wrapped around each other to fight, or because the roll center deflection pulley and biting rope arising phenomenon will cause deformation rope wear. If the surface of the thin wire worn cut, deformation wear and abrasion of the difference between the external as shown in Figure 1. This deformation wear and deformation due to local press, the wire cross-section extending to the sides at the extrusion into a fin-shaped. From outward appearances, wire width expansion, although much reduced wire cross-sectional area, but the local press at the steel surface material hardened, easily broken wire.

1.3 internal wear
In the course of using gantry  jib crane  , wire rope through drum or pulley when the entire load of pressure to bear on one side of the rope, the radius of curvature of the root thin wire impossible identical. Also, because the rope bent, thin steel wire rope inside the root will generate force and produce another slip, then contact stress between stocks and shares increases, the share between adjacent wires produce local indentation furrow. When repeated cycles stretch bending, is generated in the deep recesses of stress concentration was broken, constitute internal wear. Usually thin wire rope surface pressure and the pressure proportional to the tension of the same case, since the pressure receiving area are different, the pressure per unit area is different. Under pressure from the surface wear of view, the use of line contact wire rope advantageous than using point contact, the use of surface contact wire rope line contact than using more favorable. In addition, the degree of bending wire rope, velocity, internal wear on the rope are affected. Obviously, the selection line contact or surface contact type of rope is an effective way to reduce internal wear.