System and method for preventing gliding during secondary lifting of crane

Abstract

The invention discloses a system for preventing gliding during secondary lifting of a crane. The system comprises a load gravity sensor (23), a driving variable sensor, an electronic control unit (25) and a brake driving device, wherein the load gravity sensor detects the load gravity of the crane; the driving variable sensor detects a driving variable signal; the electronic control unit receives a load gravity signal and a driving variable signal, and calculates the value of a lifting driving force according to the driving variable signal; and when the lifting driving force is equal to the load gravity, the electronic control unit operates the brake driving device to release the braking mode of a brake (3). By detecting the load gravity in real time and continuously calculating the lifting driving force F according to the driving variable which is detected in real time, the system can automatically perform matching control according to different loads and different working conditions to ensure that the gliding phenomenon during the secondary lifting of the crane is eliminated, and the safety is improved. Besides, the invention also provides a method for preventing the gliding during the secondary lifting.

Description

technical field [0001] The invention relates to a system for preventing secondary lifting and sliding of a crane, and more particularly relates to a system for preventing secondary lifting and sliding of a crane by controlling the operation of a brake. In addition, the invention also relates to a method for preventing secondary lifting and sliding of a crane. Background technique [0002] A crane is a mechanical device used to transfer objects from one spatial position to another. During the lifting operation of the crane, the most common problem is the "secondary lifting and sliding" problem of the crane. [0003] The so-called "secondary lifting and sliding" of a crane means that when a heavy object hovering in the air is lifted for the second (or third) time, the heavy object will often slide down a certain distance due to its own weight before it can be lifted normally. . When this "secondary lifting and sliding" is serious, it may cause major safety accidents. For exa...

AI Technical Summary

Problems solved by technology

This method is mainly suitable for closed hydraulic systems (the working pressure in the hydraulic circuit of the closed hydraulic system is relatively stable, so it is relatively easy to detect), but in this traditional technical solution, the pressure stored in the memory is not accurate, which is Because the winch mechanism will impact the hydraulic fluid during the previous braking, thereby causing pressure fluctuations, the pressure value stored in the memory may be a peak pressure value or a trough pressure value. At the beginning of the second hoisting, due to the excessive hoisting driving force, it will cause an instantaneous impact, which will cause great damage to the steel wire rope and related components of the crane; If the lifting driving force is too small, the problem of secondary lifting and sliding will still occur, and the more serious defect is that this prior art essentially only compares the working pressure of the hydraulic fluid during the secondary lifting with that of the previous lifting. It is easy to deviate from the actual load weight and cause serious secondary lifting and sliding

[0008] It can be seen from the above-mentioned prior art that most of the secondary lifting and sliding problems of existing cranes are solved by relying on the pressure memory of the hydraulic components or the working pressure stored in the memory. Since this prior art cannot perform real-time detection to dynamically The comparison between the lifting driving force and the load gravity, and because the reference pressure values ​​stored or memorized by hydraulic components, memory, etc. are not accurate, not only the reliability is poor, and the problem of secondary lifting and sliding cannot be effectively solved, but these The existing technology is generally only applicable to one of the open hydraulic system or the closed hydraulic system, and the versatility is poor

As far as the current development situation is concerned, cranes at home and abroad, especially hydraulic cranes, have not yet formed a universally applicable solution to prevent secondary lifting and sliding

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