Multi-hook synchronous control system based on hydraulic winch and applied to cranes and method thereof

Abstract

The invention provides a multi-hook synchronous control system based on a hydraulic winch and applied to cranes. An encoder used for measuring the number of winding turns of a winding drum and an overspeed switch used for monitoring whether the rotating speed of the winding drum exceeds the limit or not are mounted on an output shaft of the winding drum; a steel wire rope layer measuring sensor for measuring the current winding diameter of a steel wire rope is further mounted on the winding drum; a control center is connected with a hydraulic power control device, a motor speed measuring sensor, a braking state monitoring sensor, the encoder and the steel wire rope layer measuring sensor; and the hydraulic power control device is used for controlling hydraulic power output so as to further control the rotating speed of the hydraulic motor. The system has the characteristics of simplicity in operation, safety, reliability and stability in operation. According to the system, mechanical, electric and hydraulic integration can be considered; all parameters of operation of a winch mechanism and a hydraulic system are monitored in an all-around mode; and closed-loop control of the lifting height and speed of a hydraulic lifting mechanism is achieved.

Description

technical field [0001] The invention provides a hydraulic winch-based synchronous control system and a synchronous control method for multiple hooks of a crane, which belong to the technical field of electro-hydraulic control of engineering machinery. Background technique [0002] With the advancement of technological development and infrastructure construction, in the lifting industry, due to the weight or volume of the lifting object is too large, multiple lifting equipment needs to be linked to lift the moving object. The traditional single winch rope hoisting can no longer meet the requirements. Therefore, more and more equipment needs multiple winches to assist hoisting. Affected by various factors such as hydraulic systems, differences in structural parts, friction, etc., it is difficult to ensure that multiple winches can Yang releases or retracts the same length of steel wire rope per unit time, and the difference in the amount of rope output / retraction will cause th...

AI Technical Summary

Problems solved by technology

[0006] (1) Before enabling the synchronization mode, the hook must be manually adjusted to the level. The counter measures the pulse signal. After the controller is powered off, the state of the hoisting rope cannot be recorded, and the system cannot judge the initial degree of hook inclination; (2) The diameters of the drums of the two hoists must be equal. If the diameter of the drum exceeds the specified value, the deviation will be accumulated every time the hoist rotates. After the number of rotations is too many, the hook will be tilted; (3) The diameter and length of the wire rope are also They must be equal, only in this way can we ensure that the two hoists have the same amount of rope output / retraction when they rotate at the same angle, if one hoist is used for a long time and then double hoist is used, the diameter of the wire rope is likely to be different

In this case, the original scheme cannot be used to control the winch synchronization

[0007] To sum up, most of the current multi-hook cranes based on hydraulic winches, whose synchronization is based on manual intervention or indirect open-loop speed adjustment, cannot truly and effectively realize the stability and safety of the hoisting mechanism during operation. Complicated adjustment and low operating efficiency

Images