Control method and control system for safely releasing winding steel wire rope

Abstract

The invention discloses a control method and a control system for safely releasing a winding steel wire rope. The control method comprises the following steps: selecting a marking position of the winding steel wire rope, practically placing a steel wire rope in the marking position and recording the marking position; setting a rope-releasing safety alerting position of the steel wire rope; taking the marking position as an original position and detecting the turning circles of a winding machine in real time; obtaining the present position of the winding steel wire rope in real time according to the original position and the turning circles of the winding machine; and limiting the winding machine to continue releasing the rope when the present position is at the rope-releasing safety alerting position. According to the control system and the control method, the information about the steel wire rope located in the rope-releasing safety alerting position can be obtained only on the basis of the detected turning circles of the winding machine, so that the continuing releasing of the steel wire rope is timely limited and the control for preventing the over-releasing of the steel wire rope is very reliable. Besides, the marking position is randomly selected, the marking efficiency is ultrahigh and the control method is suitable for a normal construction field.

Description

technical field [0001] The invention relates to the technical field of hoisting of cranes, in particular to a method and system for controlling the safe release of hoisting steel wire ropes. Background technique [0002] The hoist is one of the important parts of the crane, and the hoist controls the retraction and release of the wire rope, thereby lifting or lowering the hoisted heavy objects. [0003] The safety of the crane control system is very important, and the over-feeding of the hoisting wire rope is one of the problems that affect the safety and reliability of the crane. Over-releasing is to release the rope excessively. When the winding length of the wire rope is limited, the rope is still continuously released, resulting in a hoisting accident. For this reason, the hoisting of cranes at home and abroad all adopts the protection device that prevents the wire rope from being over-discharged at present. [0004] The three-turn protector of the cam mechanism is a c...

AI Technical Summary

Problems solved by technology

[0006] First, the effectiveness of the cam mechanism depends on mechanical contact, and mechanical wear can easily lead to contact failure or deviation, resulting in protection failure;

[0007] Second, the trigger position is not easy to determine, and idling often occurs when hoisting and retrieving the rope. The length of the wire rope has not changed, and the driven gear of the cam mechanism continues to rotate. When the next time the wire rope is unwound to three turns, it will start from The moving gear has not rotated to the set position, that is, the three-turn protection is invalid

Therefore, once this situation occurs, it must be readjusted, and during debugging, the steel wire rope must be continuously released until the three-turn position, which brings great inconvenience to debugging and use. The above debugging process

[0008] Third, the above-mentioned cam mechanism can only perform rope release control when the wire rope is in three turns, and other parameters of the wire rope, such as the length of the wire rope, and the margin of the rope, cannot be monitored, and it is difficult to meet the requirements of precise control.

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