Crane, method for controlling tension of steel wire rope and hydraulic system

Abstract

The invention provides a crane, a method for controlling the tension of a steel wire rope and a hydraulic system, and the crane, the method and the system can be used for solving the problems of low stability and low work efficiency of the conventional stretchable arm type crane with a super-lifting winding mechanism during stretching of a lifting arm in the prior art. The hydraulic system comprises a master reversing valve, a switching valve, a check valve, a backpressure valve and a hydraulic motor, wherein the master reversing valve is used for leading hydraulic oil into or out of the hydraulic system; the hydraulic motor is used for outputting power to a traction device of the steel wire rope; a first end of the switching valve is communicated with a first oil outlet of the master reversing valve; the inlet of the check valve is communicated with the outlet of the backpressure valve; a second end of the switching valve is communicated with the second oil outlet of the master reversing valve and a first end of the hydraulic motor; and the inlet of the backpressure valve is communicated with the outlet of the check valve and a second end of the hydraulic motor.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane, a method for controlling tension of a wire rope, and a hydraulic system. Background technique [0002] Crane is a kind of common construction machinery. With the continuous improvement of production demand, the lifting load of the crane is also increasing. For telescopic boom cranes, in order to increase the overall stability after the boom is stretched out, most of the large telescopic boom cranes are equipped with a superlift winch mechanism. The super-lift winch mechanism is mainly composed of steel wire rope, super-lift winch motor, super-lift reducer and auxiliary hydraulic pressure and control systems. figure 1 is a schematic diagram of the boom of a crane, at figure 1 Among them, 11 is a boom, and 12 is a super lifting wire rope. [0003] In the related art, when the telescopic boom of the crane is stretched out, with the continuous increase of th...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a crane, a method and a hydraulic system for controlling the pulling force of the steel wire rope, so as to solve the insufficient stability of the telescopic boom crane with the superlift hoisting mechanism in the boom telescoping process in the prior art, and the working low efficiency problem

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