Gantry crane (or overhead gantry cranes)

Conveying way timber haulage ways according to the type of timber, storage size, topography and covers an area that is selected regional requirements, which is currently being conducted among domestic experimental study and gain experience. Now introduce hoist gantry crane several major haulage way. Large timber gantry crane haulage storage sites use more gantry cranes (or overhead gantry cranes) stacking, unstacking, pulling wooden machine horizontal transport, or bridge crane stacking, steel crane unstacking to pull the wooden horizontal transport aircraft fitted. Conveying medium-sized timber frame bar semi-mechanized transport field, then use more stacking frame bar.

Double door frame is divided into rigid gantry legs hyperstatic

Railway yard gantry cranes ( hereinafter referred to as gantry cranes ) are mostly working in the open air , affected by natural wind . When the wind is greater than the steel crane predetermined value, the machine should be stopped . Or working in the state to stop the crane when subjected to strong winds , probably due to the wind and cause the brake device is not fortified gantry crane was blown away or tipping accidents , and even cause the plane crash . According to " crane safety supervision and inspection procedures " provides crane running on the track in the open-air work ( including rail gantry cranes ) , should be fortified wind devices. Two-stage wind brake effectively solve the wind braking railway gantry crane working state of hoist gantry crane emergency shelter under braking and static state . In the design and manufacture of gantry cranes , the correct choice of two levels of wind braking device is important . Hangzhou Railway Bureau tube gantry crane windproof two types of brake hydraulic brake wheel electric brakes two wind power hydraulic brake wheel brake device is a dual- power hydraulic brake system . In 36/16t gantry crane manufacturing , carts Traveling with double output shaft of the motor (YZR180L-8, 11kW), both sides were assembled brake wheel (φ300 and φ200), wind brake and brake work by the two were often closed electro-hydraulic brake blocks to complete.

Overhead crane automatic control jib crane of nonlinear underactuated

Under- drive system is the number of degrees of freedom to control the amount is less than the system of a class bridge gantry crane . By eliminating the parts of the drive system can reduce the complexity of the design , and can effectively reduce the cost or weight of the system itself , and thus the practical application of many of the systems are designed to be under- drive system , such as spacecraft , helicopter , underwater vehicle , satellite, flexible robots ; addition, when a drive failure of some all- drive system when it will become a less drive system. Although UNDERACTUATED bring great convenience features on the system design, manufacture, but it also makes the internal dynamics of the system is more complex, and usually accompanied by a non- complete constraint , so the system control has brought great challenges in recent years, the study of such systems control theory and gradually developed into a research steel crane. Overhead crane is a typical non-linear , strong coupling, due to the drive system , it has a load capacity, flexible operation , significant energy saving , etc., has been widely applied to many areas of industrial production , ports and transportation. In order to improve transport efficiency and safety performance of the cable car system , an urgent need to design a reasonable control strategy to achieve its automatic operation.

Typical gantry crane nonlinear systems

Overhead crane load capacity, flexible operation, in the industrial and transport fields have a wide range of applications . However, the overhead crane is a typical nonlinear , hoist gantry crane coupling, due to the drive system to achieve efficient control of its security is facing many difficulties , therefore , control of such systems has become a hot topic. Various crane control methods proposed in recent years , such as sliding mode control, adaptive control , although theoretically possible , but taking into account nonlinear interference and coupling phenomena that exist in the actual system , its usefulness remains to be tested. Experimental methods have become characteristic analysis system , controller design, stability verification steel crane technology tools. For these reasons , we designed and developed a three-dimensional overhead crane system is automatically controlled experiment , in order to verify the relevant control strategies implemented to provide a great convenience . The system can not only simulate the actual operation of the real good cable car system , and is very easy to test a variety of control algorithms and adjustments. In order to verify the reliability of the experimental system , the number of species on the overhead crane control method is applied to the experimental system , the experimental results are consistent with the theoretical analysis of the original documents , which illustrate the effectiveness of the system. Introduction bridge crane overhead crane system is a typical nonlinear systems owe drive .

Chain electric hoist

Chain electric hoist made up for the shortcomings of wire rope electric hoist large bulky. Chain electric hoist motor, drive mechanism and the sprocket, and steel wire rope electric hoist's biggest difference change wire rope to the chain. Lifting weight average of 0.5 ~ 60 tons, lifting height is 3 ~ 120 meters. Chain electric hoist, keep hand chain hoist and convenient features, and improve the hand chain hoist steel crane operation, slow speed and so on, gathered his hand chain hoist and electric hoist, the advantages of using disc brake motor as power cycloid pin gear reducer reducer, chain electric hoist compact structure, small volume, light weight, high efficiency, easy operation, reliable braking, the characteristics of simple maintenance. Chain electric are mainly domestic platinum (Vanbon), TXK, ELK, WKTO, imported Japanese like CARDS, toyo, Japanese ghost number one, and sino hoist, animal husbandry, grace and so on Europe and the United States electric hoist and other several use is more, quality is good brand. Chain electric hoist capacity: 240 kg, 300 kg, 0.5 t, 1 t and 2 t, 3 t, 5 t, 10 t, t, 20 t, 30 t, 35 t, 50 t, t, 60 Shanghai wan platinum crane (Vanbon) have been able to achieve the maximum tonnage of 100 tons. Chain electric hoist chain electric hoist speed: double speed, single speed, frequency conversion start, double speed variable frequency start, domestic at present technology has been able to achieve a double speed variable frequency electric hoist manufacturing requirements. Chain electric hoist brake: pound of magnetic brake, conical rotor braking brakes, double brake (pounds magnetic brake + mechanical brake) chain electric hoist according to lifting methods are divided into: crane, crane lifting stage special upside down. Chain electric hoist characteristic: the performance of advanced structure, small volume, light weight, reliable performance, convenient operation, chain electric hoist applicability is wide and the lifting heavy objects, loading and unloading, maintenance equipment, lifting the goods is very convenient and chain electric hoist can be mounted to the impending h-beam, curve track, slewing crane rails and fixed hoisting hanging heavy objects. Chain electric hoist access power 110 v to 690 v (domestic current can reach), the standard generally is 380 v, 50 hz. Chain electric hoist control switch voltage is 36 v / 24 v (control switch if without built-in transformer into 36 v safety voltage will cause harm to the person so most of the link chain electric hoist control voltage is 24/36 v). Chain electric hoist standard configuration must contain a limit switch phase and phase sequence protector.

The structure adopts steel structure industrial building

At present, most of the industrial hoist gantry crane structure adopts steel structure, all kinds of span, the cross section of the steel crane beam needs more and more. Compared with more than 10 years ago, when the steel crane beam in the design of product quality requirements, especially further strict to the requirement of welding quality; And, because the owners of construction period limit makes the steel crane beam production cycle have to further compression; Second, due to the increasingly fierce competition in steel structure manufacturing, make the bid have been almost zero profit in the competition, all contractors have to excavate the potential to reduce the steel crane cost from various channels. Steel crane beam is one of my company's main steel structure products, accounting for about 50% of the annual steel structure manufacturing tasks. My company to undertake the EGang cold rolled sheet plant engineering main factory main rolling across different and finished 1/3 blocks of steel crane beam installation tasks, a total of 64, including 15 m across 56 root, 9 m across 4, 2.2 welding position: CO gas shielded welding using short 2 road transition welding, suitable for flat, vertical, horizontal, and all position welding. 2.3 current density, current density is high, the molten drops high fusion rate and is suitable for the welding process of single-sided double-sided forming. 2.4 welding deformation, heat concentration, heat affected zone 21 m across four root; Material Q235 - C 32, small wood, after welding deformation is small.

The safe operation of the enterprise lifting equipment

Hoisting equipment safe operation of township enterprises existing problems and countermeasures of the economic system reform continued to deepen, the villages and towns set is common, according to the statistics data show that about 70% of body economy got a rapid development, the production steel crane the traffic, electricity enterprise lifting equipment operators without card mount guard. Ladder, the big increase in the number of tower crane and other lifting equipment. But the technical force is weak, the personnel quality is poor. Village and township enterprises, due to many hoist gantry crane enterprises do not know the lifting equipment safety industry from staff to management, most without technical management technology, the hoisting equipment purchase, installation, operation and management training to mount guard work, technical quality is poor, lack of lifting equipment, there are a lot of problems, lifting equipment accidents frequently maintenance knowledge, to repair and maintenance, lifting equipment is not happening. Statistics show that from 1990 to 1995, the city leads to lifting equipment often run in spite of illness. Township enterprises lifting equipment by less than three hundred to three hundred in order to ensure the safety of the hoisting equipment of township enterprises economy more than five hundred; Lifting equipment accident of inductrial injury accident caused by the operation, do well the safety in production, promote enterprise development, improve the rate from 2% to 2%. Hoisting equipment accident rapid economic benefits, the author thinks that must do the following work: speed increase, not only seriously affected the normal production of township enterprises to strengthen publicity and education, increase awareness of production safety.

Lifting machinery safety procedures

Lifting machinery safetysteel crane have been enacted 25 years of GB/T6067-1985 "hoisting machinery safety regulation, in June 1, 2011 by GB6067.1-2010" hoisting machinery safety procedures part 1: general rules "(hereinafter referred to as the new rules) replacement, the new rules focus on system safety, to adapt to the application of new technology, new material and update of the standards, in line with international standards. The new regulations as a hoist gantry crane national standards, to improve lifting machinery safety requirements, to reduce the lifting accident rate and ensure the safe operation of the hoisting machinery, will play a positive role in promoting. The new regulations mainly has the following characteristics. To adapt to the extensive and comprehensive system the new procedure from system concept, highlight the partition of security system and induction, is a adapt to the extensive and comprehensive system of hoisting machinery safety technical guidance. First of all, the new regulations applicable to the design, manufacture, installation, alteration, maintenance, use, scrap, check and so on eight aspects, than in the past the old rules added three parts installation, modification, maintenance. Secondly, the new regulations in order to adapt to the special requirements of various types of lifting machinery safety technology, considering from the function of the hoisting machinery and institutional characteristics, the old rules broken down into seven parts, the first part is the general rules; The second part as mobile crane; The third part is the tower crane.

The basic construction of bridge crane is the same as the hook bridge crane

The basic construction of bridge crane is the same as the hook bridge crane, the difference is on the hook to hang a dc lifting hoist gantry crane (also known as the electromagnetic sucker), used for lifting with magnetic conductivity of ferrous metals and their products. Usually after in bridge walked electric generating set on the stage or in a driver indoor SCR dc to ac power to dc power supply, and then through the trolley frame of special cable drum, dc power supply with flexible cable to lifting electromagnet. Bridge crane bridge crane has three types: grab hook bridge crane, electromagnetic hook bridge crane grab and electromagnetism bridge crane. Its characteristic is everywhere in one car is equipped with two sets of independent lifting mechanism, a set of grab bucket, a hook with (or a set of steel crane chuck with a hook, or a grab for magnetic chuck with a set of use). According to the need can use hook lifting heavy objects, and can also be on the hook to hang a motor grab unloading material, also can unload the grab to hang black metal disk lifting, so called three bridge (renewable) using a crane. As a result, the models must be the same with electromagnetism bridge crane, set up the electric generator or SCR dc power box. This kind of crane is applicable to often change for plant material place. Double bridge crane this crane and hook bridge crane basic same, just the bridge rack is equipped with 2 sets up the same weight of the car. This model used for lifting and handling elongated objects.

Crane controller

If compared the behavior of the crane to a single pendulum, then experienced crane operators can eliminate many payload oscillation caused slowdown in the process of oscillation, cancel the hoist gantry crane process of oscillation. However, some types of payloads and rigging double in these conditions, dynamic so even skilled operation manual method of eliminating oscillation become very difficult. As a result, some researchers have suggested increasing feedback control to suppress the double pendulum is dynamic. The steel crane of using feedback control, due to the difficult to measure the payload of the bill. Therefore, this article does not advocate feedback control, but the shape control command, don't need sensors. Crane controller, is actually the real-time vibration suppression, it must be produced from human command signal to filter out unnecessary incentives. Such changes can be generated by convolution with humans a command signal pulse sequence. Convolution results, and then used to drive the crane motor. Driving crane.

Bridge crane is horizontal plane in workshop, warehouse and yard over the material lifting hoisting equipment

Bridge crane is horizontal plane in workshop, warehouse and yard over the material lifting hoisting equipment. Because of its ends located in tall cement posts or metal stents, shape like bridge. Bridge hoist gantry crane bridge along the laid on on both sides of the elevated rail longitudinal operation, can make full use of bridge the space below the lifting materials, from the ground equipment obstacles. Used in construction hoisting machinery, according to its structure and properties of different, general can be divided into small light lifting equipment, bridge type hoisting machinery and boom type crane three categories. Small light lifting equipment such as: jack, hoist, winch, etc. Bridge type hoisting machinery such as beam cranes, steel crane crane, etc. Boom type crane such as fixed slewing crane, tower crane, truck crane, tires, crawler cranes, etc. The following is a kind of hoisting machinery of: (1) mechanical truck crane hydraulic truck crane crane all terrain off-road vehicle (2) tower crane crane rail type rotary tower crane rail type rotary ZiSheng on tower crane rail under the rotary tower crane rail type rotary ZiSheng tower crane fast loading type tower crane tower crane car tyre combination tower crane crawler tower crane tower crane (3) the crawler crane crawler machinery hydraulic crawler crane crawler crane electric hoist mast crane cable type mast crane sprag type mast crane cable crane radiant cable crane translation type cable crane type cable crane

Bridge crane is very widely used in industrial and mining enterprises, a kind of hoisting machinery, bridge crane, and more than a locomotives now attachment

Bridge crane is very widely used in industrial and mining enterprises, a kind of hoisting machinery, bridge crane, and more than a locomotives now attachment, use frequently, every day a lot of work. Bridge crane can work directly affect the completion of tasks of locomotive overhaul and the safety of person and equipment. Drag the original use of bridge crane system consists of wound rotor ac asynchronous motor, the rotor resistance multistage speed regulation in the series circuit, the CAM controller, the relay - hoist gantry crane control, the main shortcomings of this control system is: the motor rotor series resistance speed governing energy consumption type of slip speed regulation, large energy consumption and mechanical properties of soft, small range of speed regulation, and the smoothness is poor; Mechanical shock, steel crane the service life; Therefore, only completely change the way the original speed regulation can fundamentally solve the problem of bridge crane high failure rate. With the rapid development of electronic technology, frequency conversion speed governor performance, reliability, all had the very big enhancement, for its application in bridge crane drive system provides favorable conditions. We first for locomotive diesel engine assembling important work to 32 tons bridge crane frame of the big car drag system and hook system for frequency conversion transformation, to improve its operating performance, reduce the failure rate.

Work type and weight of the crane are two different concepts

Work type and weight of the crane are two different concepts, the weight is big, not necessarily is heavy, the weight is small, also is not necessarily the light level. Such as water power station with the crane lifting weight of hundreds of tons, but very few use opportunity, is only used when installing unit and repair unit, the rest of the time is down there, so even though the weight is very big, but still belongs to the light level. And as the station yard gantry hoist gantry crane, while the weight is not big, but the job is busy, belong to the type of heavy work. Crane type of work and safety performance has a very close relationship. Lifting weight, span, lifting height of the same crane, if different type of work, in designing and steel crane, the safety factor is not taken by the same, or different parts model, size, specification. Brake, due to the different type of work, such as wire rope safety coefficient of different levels (light safety coefficient is small, heavy security coefficient), selected models is not the same. As is 10 t bridge crane, again for the work of the intermediate type (JC = 25%) of the hoisting motor power for N = 16 KW, for the heavy work types (JC = 40%) hoisting motor power is N = 23.5 KW.

Cantilever crane

Cantilever crane steel crane main use of boom keep out appearance around the vertical axis of rotation (pitch) cooperate with lifting goods, using flexible action, meet the requirement of loading and unloading, and its form has fixed, mobile and floating. Cantilever crane sino hoist crane main use of boom keep out appearance around the vertical axis of rotation (pitch) cooperate with lifting goods, using flexible action, meet the requirement of loading and unloading, and its form has fixed, mobile and floating.

Wharf cranes crane equipment such as the lack of development

Although in recent years the construction, port construction implementation, wharf cranes and other  sino hoist  equipment have been relatively rapid development. But in the rapid development, we still need to know that we exist some shortcomings, after all, only the presence of such awareness, enterprises or individuals, what we need to know. Understand their own disadvantages and advantages to be able to truly realize their own progress and development.
1, the domestic equipment manufacturing enterprises crane overall design of the low level, especially in innovative design ability, mostly stay in the imitation stage, the product level is difficult to improve.
2, the market most of the small scale enterprises hanged machine, subject to market constraints, some companies generally do not have to take it as a major product development, manufacturing processes and equipment generally lag behind.
3, from the point of view of product marketing in recent years, a lot of product quality, but off, poor reliability, resulting in high failure rate, hoist gantry crane  safety has become a topic of concern to society in general.
4, cab and interior design has long been a weak link in crane design, supporting industries lack of capacity also affects the overall level of product improvement.
5, product specifications less, generally only 1 to 2 business sizes, it is difficult to meet the needs of various users at home and abroad. In addition, the product update cycle is long, some enterprises for product upgrading is not enough emphasis.
6, technical services are not in place, the level is not high, the lack of an effective technology to track products. In products and services, domestic enterprises and foreign crane larger than the gap, but also improve the comprehensive service system.
7, as in recent years, rising raw material prices, the manufacturing cost is high.
     In the face of these developments lack of  steel crane  equipment, crane manufacturing enterprises should integrate research efforts for technological breakthroughs, improved product mix; facilitate planning of production, reducing costs; while enhancing quality of products and services, I believe so, China's crane equipment development will be more rapid, open foreign markets to occupy foreign markets just round the corner.

Several classifications Port Machinery

      Port machinery we all know , this is only for certain machinery a general term which refers not just mechanical . For example , port  hoist gantry crane  , quay cranes , harbor cranes, etc. belong to the port machinery . In order to better understand them , understand them , or to better manage them, we often classify them . The current classification is usually this: the composition of the unit body shape , rod connected to the external load and structure as well as the mutual position in space , three.
1, where unit body shape can be divided according to the following three :
Rod structure which is a combination of many rod member , and each rod member is characterized by a height, width , and a length great .
The lever itself can either be a general steel, it can be thin-walled structure . Thin-walled structure, which means the body is characterized by a width, length is large, while the thickness is very small, such as sheet metal , shell and thin-walled parts . Such structures such as  bridge gantry crane  metal structure in the promotion of the use , there will be a very significant value .
Physical structure , the main features of this structure is that the length, width , and high measure of those who have similar structures . This structure in the metal structure of the crane hardly been used.
2, according to rod connected to the situation can be divided into three categories:
Hinge structure , two or more rods coupled to the node point is called , assuming all nodes in the structure are ideal cylindrical articulation , the lever only by the axial force , called the hinge structure of this structure .
Rigid structure, the structure of the nodes are rigid, cross at a junction to a relative displacement of the lever can not , can not occur relative rotation therebetween. Therefore, under external loads , steel generally produce moment, shear and axial force , bending moment which dominated .
Hybrid structure, the structure of both the articulation nodes , there are rigid , hinged lever only by the axial force , steel ground rod is subject to both a bending moment , shear and axial force .
3 , according to the external load and the mutual position of the spatial structure can be divided into two categories :
Planar structure , such as the role and structure of all elements of the load axis of the lever are in the same plane , i.e., structure analysis and calculation carried out only to the plane of the force system , is called the planar structure.
Spatial structure , such as the composition and structure of the applied loads axis of the lever is not in the same plane , then the structure analysis for calculation of force system according to space ,steel crane is called the spatial structure .
Many people may read these are not very clear, but when you carefully read or engaged in this industry, then for this understanding is a must. We need a clear structure and context, so that we can see at a glance which category this machine , the mechanical advantage of the presence in what ? I believe this is what we want !

Crane Hydraulic System Attention five-point problem

At present, China is basically a hydraulic  overhead bridge crane  as their motivation to work, so there are many internal parts of the crane hydraulics. The normal operation of the hydraulic unit is the basic crane working key. Therefore, if there is no operation and maintenance in accordance with prescribed rules, on the one hand, causing the crane does not work properly run. On the other hand, may also greatly reduce engine life. Therefore, in our daily work operations, you should look at five questions:
First, we work, we must first check the mailbox crane hydraulic oil is not adequate, if not enough, it should be added immediately. In addition, the refueling time, we must proceed from a strainer to join, but can not add other brands of hydraulic oil;
Second, the oil filter cartridge job almost ten days or so, it shall be checked, if necessary to carry out cleaning and replacement;
Third, the hydraulic tank fifteen days will put out the oil from below and remove impurities. In addition, when the  overhead gantry crane  work for a year, I want to replace all the hydraulic oil tank.
Fourth, there are many crane hydraulics valve is not the same as they had before the manufacturing factory after various experiments tune just the flow and pressure when in operation do not easily rotated, so as to avoid the machine failure.
Fifth, after each job, remember to clean the hydraulic unit.
steel cranes need our routine maintenance when the job should comply professional charters to avoid some of the accidents.

Overhead crane handling precautions

With the continuous development of China's machinery industry, the development of the crane is also very fast. Now, the hoist gantry crane  is very widely used in the country, for example in the mining industry, the construction industry and so on. Bridge crane itself belongs to the state of special equipment, so in operation, we should pay more attention to avoid unnecessary accidents. Following small and brief you on the bridge crane operator should pay attention to several issues:
First, we have before the operation, first ensure that the work area must be flat, solid, no potholes place;
Second, the  steel crane  in the job, you must first trial hanging.
Third, bridge cranes when the job must be kept vertical lifting rope, to avoid accidents.
Fourth, the bridge crane hook and pulley should maintain a certain distance between, especially in the height of the heavy lifting when, so to avoid windlass too far, to prevent the wire pulled off, so that the boom after the turn.
Fifth, in the job, workers should be noted that the legs must not be manipulated through the flip handle, hanging objects should be first first down, again adjusted.
Sixth, the operator can not just lift heavy objects on the ground, so that may cause overload operation, causing an accident.
Seventh, the starter in the rain and snow bridge work, employees must pay more attention to the job.
Above is Xiaobian to introduce a few on the  bridge gantry crane  in operation precautions, I hope that it helps.

Crane girder sinking cause analysis

Crane girder camber called girders sinking gradually decreases , that downward from the original camber produce permanent deformation. Below the level of the main beam provides permanent deformation called lower torsion . Girders sinking because of the following categories:

1, the structure of internal stress effects:  hoist gantry crane  metal structures exist in all parts of pulling in different directions , pressure and other stress . Fly these forces produced mainly in the manufacturing process of structural forces of deformation caused by assembling building . Further, since the welding process locally uneven heating , will result in contraction of the weld and surrounding metal , leading to the main girder residual internal stress , and thus the load under the action of the beam will have a great stress winner and cause permanent deformation. Structure residual stress , during use of the crane tends to homogenize even disappear constantly , causing the main beam of sinking.

2 , the use of irrational : the crane is within the specified conditions of use designed , for overload and other irrational use is not be considered. But a lot of use of units not pay enough attention to this long-term change in the type of work overload and use , as well as for dragging heavy objects , pulling anchor bolts and so on. According to the survey , many units of the crane is because of this irrational use damaged .

3 , unreasonable Repair : Since no master steel crane  metal structure structural deformation caused by heating of the law, and therefore did not take measures to prevent deformation , the bridge on the cutting or welding , resulting in severe deformation of the main beam , in addition, take stage heating will cause the main beam inward lateral bending of the end beam heating , not only the end of the beam back to the deformation , and will affect the main beam deformation. Therefore, we should grasp the deformation of the metal structure to avoid heating the structure must when welding or cutting , as the case may be , to take measures to prevent deformation .

4 , High Impact: According to droop , thermal processing plant using a crane used crane than the cold floor of the main beam sinking phenomenon is more common, more severe degree of subsidence , such high temperatures are mostly caused by radiant heat . This is because the high temperature environment , to some extent, to reduce the yield strength of the metal material , on the other hand the high-temperature environment , thermal stress is generated , which increases the likelihood of sinking of the main beam . It is notable that , smelting radiant heat will cause the cover under the main beam temperature greatly exceeds the upper cover , the cover is to make thermal elongation greater than under the cover of thermal elongation , under the effect of the load leads to the main beam camber natural decrease. So, in a radiant heat environment using cranes, metal structure lower insulation measures should be increased to reduce the temperature of the metal structure.

5 , unreasonable lifting cranes , storage, transportation and installation of : crane bridge is raised structure, greater flexibility, unreasonable storage, transport , lifting and installation may cause deformation of the bridge structure . The use of the bridge gantry crane  units should pay attention to proper use , abide by the rules and the necessary institutional , which prolong life and prevent the crane girders sinking is extremely important.

Construction machinery industry has ended the high growth momentum

From 2011 the first seven months of construction machinery of the situation , the industry has ended the high growth momentum.
Although the growth rate of output ,sino hoist the construction machinery industry is still in the machinery manufacturing industry to maintain a high level, but with the rapid growth of the industry compared to 2010 , the growth rate has been greatly reduced. Meanwhile , construction machinery sales of several major products has grown from growth to decline in the rate of decline of individual products is still quite large.
Production and sales from April to enter the inflection point
From 2011 the monthly output of construction machinery industry point of view, in April this year reached a peak . According to the China Machinery Industry Federation data , from January to June of construction machinery industry output value of the month was 41.922 billion yuan , 36.428 billion yuan , 59.227 billion yuan , 64.873 billion yuan ,steel crane 57.398 billion yuan , 52.717 billion yuan . From this set of data, you can clearly see that from the beginning of April , the monthly output of the construction machinery industry began monthly decline , MoM decline were 11% and 8% .
From the China Construction Machinery Industry Association statistics, also reflects the same trend. However , the entire decline in a month ahead of time , from March began. China Construction Machinery Industry Association, key enterprises Group 2011 3 to 6 months of operating income was 49.2 billion yuan , 46.1 billion yuan , 37.2 billion yuan , 31.6 billion yuan . Operating income showed monthly decline, the decline MoM were 6 %, 19 %, 15% .
In addition, from the main product sales point of view, the first three months of this year , also increased month by month , but from the beginning of April , sales began to turn down , and showed a downward trend month by month . According to the China Construction Machinery Industry Association, 24 key enterprises of the industry statistics , the 2011 excavators , loaders , cranes three kinds of main products in June with March sales comparison can be found with only three months , three large variety of both sales decline of 50 % or more. Especially excavators, the decrease is as high as 77%. March sales of 39,989 units loaders , June to 19,240 units , a decrease of 51% ; March 6860 truck crane sales units, in June of 2718 units , a decrease of 60%. March excavator sales of 43,299 units in June of 9961 units , a decrease of 77%.
April entire construction machinery industry in 30 % of the decline in output , sales have declined substantially ,hoist gantry crane when it caused widespread concern in the industry , the industry concerned thus put forward the " inflection point ," said. Recalling the situation in the industry this year , April has indeed become the high point of the entire industry , even though the "turning point , said " It is not widely recognized , but the situation now , in April this high point has become increasingly clear , and very there may be maintained until the year.