Lifting Crane Knowledge You Must Know
Nov 26, 2024
As we all know, the lifting machine is necessary equipment in various industries. The lifting machine includes overhead cranes, gantry cranes, jib cranes, electric hoists, etc provided by Henan Dejun Industrial. Due to so many clients not knowing the lifting machine's specific details, we will share the professional information here.
Lifting Machine Main Technical Parameter
The main parameters of a crane are the parameters that indicate the main technical performance indicators of the crane. They are the basis for the design of the crane and an important basis for the safety technical requirements of the crane:
Rated lifting capacity Gn
The rated lifting capacity Gn of a crane is the total weight of the load being lifted, including any divisible lifting attachments or accessories. For a hook-type crane, its rated lifting capacity is the safe lifting weight of the load. However, for cranes with divisible lifting attachments (such as grabs, electromagnetic clutches, and balancing beams), the total weight of the lifting attachment and the load is the rated lifting capacity, and the allowable lifting weight is the effective lifting weight. The rated lifting capacity indicated on the crane's tag is usually the rated lifting capacity of the crane. The rated lifting capacity tag should be prominently displayed in a visible position on the crane's structure (which is one of the maintenance tasks of the crane), to remind the operator to avoid overloading.
Span s and sweep angle r
The span S of a bridge-type crane is the horizontal distance between the centerlines of the crane's running tracks. The track centerline distance of the small car of a bridge-type crane or the track centerline distance of a ground-mounted boom-type crane is also referred to as the track spacing. Maintaining the parallelism of the crane's main track and the track of the trolley is one of the maintenance tasks of the crane.
Lifting Range D and Lifting Height H
The lifting height H refers to the vertical distance from the top of the crane's running track or the ground to the maximum lifting position of the hoisting device. Some cranes allow the hoisting device to be lowered to the ground or above the top of the running track, and the lowered distance is called the descent depth. In this case, the lifting range of the crane is the sum of the lifting height and descent depth, i.e. the vertical distance between the highest and lowest working positions of the lifting device. In the actual operation of the crane, the lifting height must not exceed the allowable value. Exceeding the limit will cause the end of the wire rope wound on the hoisting mechanism's drum to exceed its load-bearing capacity, leading to a fall accident.
Working Speed: V
The working speed V of the crane's working mechanism when operating at its rated load. It includes the lifting speed Vq, the travel speed Vk of the crane's running mechanism, the travel speed Vt of the crane's lower running mechanism, the lifting speed Vl of the crane's lifting mechanism, and the rotating speed ω. The working speed of a mobile crane in its road travel state is described by the walking speed V0. When one of the crane's working mechanisms can operate in multiple gears, in general, the larger the load, the lower the working speed. For arm-type cranes, the rotating speed should be controlled to prevent the centrifugal force generated by the hoisted load from causing the crane to tip over.
Crane use frequency control benefits
1. The speed regulation range is wide, which can meet the precise positioning requirements of the operation.
2. Highly integrated components and high-reliability low-voltage electrical components effectively solve the problem of complex wiring in the original electrical system, not only reducing the system failure rate but also making maintenance easier.
3. The touch screen monitoring system enables the operation and maintenance personnel to run the system fault self-diagnosis and handling functions through the human-machine interface, greatly reducing maintenance time and costs.
4. Compared with the direct current drive solution, the frequency conversion system can eliminate the need for complex and expensive direct current motors, and instead use convenient, energy-saving, and economical alternating current motors.
5. Compared with conventional electrical control schemes, the frequency conversion system eliminates the need for large power resistors on the motor rotor side, acceleration contactors, and reversing contactors for the motor.
6. It can meet the speed regulation requirements of the hoisting mechanism, including low-frequency torque characteristics and four-quadrant operation; it can run at low speed for a long period; and it can effectively prevent the phenomenon of ground hoisting with heavy loads.
How To Choose Overhead Crane Working Speed?
The working speed of the bridge crane includes the lifting speed, the running speed of the trolley, and the running speed of the trolley. The choice of working speed depends on a variety of factors.
First of all, it is related to the lifting weight, the crane with medium and small lifting weights should choose high speed to improve productivity, and the lifting machine with large lifting weight should choose low speed to reduce the driving power and improve the smoothness and safety of operation. The working speed also depends on the work level and use requirements, the work level is high, and often used, and the crane that requires high productivity is selected at high speed; Low working level, the working mechanism for adjustment operation can be selected at low speed; Only for equipment installation and maintenance of the crane should be used in addition to low speed, but also according to the need, the use of dual speed (fast, slow), micro speed or speed regulation. The use of frequency control can make the working speed 1:10 with arbitrary adjustment. The working speed is also related to the size of the service space of the crane, and the high speed should be selected for the long-running distance and the large lifting height.
When the crane running distance is short, it is not appropriate to use high speed, so as not to start braking without starting. But with the development of modern industry. Cranes that do a lot of transshipment work are increasingly using high speeds. A large number of cranes for installation and maintenance use speed regulation. For some special functions of the crane, such as the crane used for workpiece quenching operations, there should be a rapid descent device; In addition to appropriately increasing the lifting speed of the crane with large lifting height, it can also use low-speed for heavy load, high speed for no-load, or take measures to obtain a higher falling speed to improve productivity.
Conclusion
To sum up, Dejun's lifting machine is very popular in the market. We will provide you with the machine at a competitive price. Regarding lifting machine details, any questions, please contact us at any time!
