Method and device for controlling super-lift winch and super-lift winch control system

Abstract

The invention relates to the field of cranes, in particular to a method and device for controlling a superlift winch and a superlift winch control system. The method is used in the superlift winch control system. The superlift winch control system comprises a motor, a main valve and an unlocking oil cylinder. The motor comprises an oil inlet and an oil outlet. The superlift winch comprises a ratchet wheel and a pawl. During the groove entering control period for controlling the pawl to lock the ratchet wheel, the method comprises the steps that the main valve is controlled to supply oil to theoil inlet so as to provide pushing force used for pushing the motor to rotate, and thus the ratchet wheel is pushed to rotate; and a back pressure valve located at the oil outlet of the motor is controlled, back pressure of the back pressure valve is controlled to be a value changing from big to small during the groove entering control period, and the back pressure provides resistance for stopping the ratchet wheel from rotating. According to the method, the device and the system, the success rate and efficiency of groove entering control of the pawl can be increased and improved, and the hardware cost can also be reduced.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a method and device for controlling a super-lift winch and a control system for a super-lift winch. Background technique [0002] Large-tonnage cranes generally have a super-lifting mechanism. Super-lifting is to set a super-lifting support arm between the main arm and the tip of the main arm (or on the auxiliary arm, which is a tower-type working condition super-lifting) to improve the relationship between the main arm and the main arm. The relationship between the ropes makes it possible to form an excessive triangular relationship, adding additional counterweight at the tail of the crane, so that the crane can reach the maximum lifting capacity during the lifting process and ensure the stability of the crane. like figure 1 As shown, it is a structural schematic diagram of a crane with a super-lifting mechanism. figure 1 Among them, the super-lifting rope 4 is connected to the head of t...

AI Technical Summary

Problems solved by technology

[0008] In the prior art, when the back pressure is a fixed value, the success rate of entering the groove is lower. Since the back pressure cannot be adjusted, the rope tension can only be adjusted repeatedly (not equal rope length mode), so as to match the back pressure and realize the groove entry , less efficient

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