Of course, not just lifting must be perpendicular to the port
bridge gantry crane s, as well as various types of quay cranes and other lifting machinery is so. About a dozen non-lifting cranes, etc., do not know we are not clear? If in doubt, have the opportunity to work with you on it. One of them is not hanging ten: not allowed oblique oblique hanging. There may be some specific reasons people do not quite understand, analyze here with us, so that we can truly understand, remember it from the heart, to ensure the safety of construction operations.
1, oblique hanging may overload
Assuming the weight lifted from the ground as Q of objects, vertical lifting, rope tension is equal to Q S as long as or slightly larger than Q, the weight can leave the ground.
However, if the oblique, and the ground wire to the vertical at an angle. According to mechanics, the role of the tension on the rope S, so that the object can be decomposed into a vertical upward force P and the horizontal movement of the force F, to make the object hanging from the ground, P at least equal to Q. F same as the angle increases. That is,overhead bridge crane the larger the angle oblique hanging in the lifting heavy objects the same time the greater the force rope. So, if a full load when lifting heavy objects vertically, then diagonally hanging inevitable when overload occurs even rope pulled off by accident.
2, oblique hanging produce inertial forces dling personnel
In addition, the oblique hanging horizontal force generated when the F, when the heavy left front also subject to the effects of friction. After leaving the ground a moment, would object to the vertical center of the swing, it is possible and hang hanging personnel, operations personnel, or other objects around the jostling caused by accidents.
Therefore, these two aspects, the oblique oblique lifting
overhead gantry crane is absolutely not allowed, making sure the goods required when lifting vertically.
For all types of large construction machinery, every detail needs to be done very close to perfection, this is the basis for future development!
2013年9月8日星期日
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.
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.
Wharf crane operation three small dots Precautions
Today begins the pier quay
hoist gantry crane outside many occasions together, in order to ensure safe operation, afar as we propose three small dots requirements, to help you while avoiding disadvantages, better use of crane equipment.
1, lifting site selection should be appropriate
Operation should be smooth lifting spacious venue selection, ease of accidents, the timely evacuation of danger zones.
2, the lifting process should establish stable fixed point
To confirm the operation, stable foothold: standing mechanical equipment and lifting objects stacked,overhead gantry crane you should pay attention to the foot without slipping and tripping hazards.
3, lifting position should avoid harmful
Operation should avoid the loss of ability to function in the direction as lifting heavy objects that could fall in operation or slipped, asymmetrical lifting will produce a swing and rotation, hanging objects running there kinetic energy. Therefore, the operator hung suspended in the need to avoid the attention and directing these harmful orientation.
Wharf overhead bridge crane operation errors caused by security incidents are not uncommon, we must not empirically work, pay more attention to the operation is an effective means of avoiding accidents.
1, lifting site selection should be appropriate
Operation should be smooth lifting spacious venue selection, ease of accidents, the timely evacuation of danger zones.
2, the lifting process should establish stable fixed point
To confirm the operation, stable foothold: standing mechanical equipment and lifting objects stacked,overhead gantry crane you should pay attention to the foot without slipping and tripping hazards.
3, lifting position should avoid harmful
Operation should avoid the loss of ability to function in the direction as lifting heavy objects that could fall in operation or slipped, asymmetrical lifting will produce a swing and rotation, hanging objects running there kinetic energy. Therefore, the operator hung suspended in the need to avoid the attention and directing these harmful orientation.
Wharf overhead bridge crane operation errors caused by security incidents are not uncommon, we must not empirically work, pay more attention to the operation is an effective means of avoiding accidents.
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 !
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.
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.
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.
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