Hydraulic system for automatically controlling mast retraction of crawler crane

Abstract

The invention discloses a hydraulic system for automatically controlling mast retraction of a crawler crane, which comprises a first hydraulic pump, a second hydraulic pump, a main valve, a third hydraulic pump, a first switching valve group, a second switching valve group, an electromagnetic valve, a brake and an auxiliary valve. The main valve is provided with a port P, a port A and a port B, wherein the port P is connected to the first hydraulic pump, the main valve is also connected with the first switching valve group and the second switching valve group, and the port A and the port B are respectively connected with a motor. The brake is connected to the port P of the motor and the electromagnetic valve. The second hydraulic pump is connected to a port A of the electromagnetic valve,the first switching valve group and the second switching valve group. The auxiliary valve is provided with a port P, a port A and a port B and is connected with the third hydraulic pump through the port P, the port A of the auxiliary valve is connected with a rodless cavity of a mast oil cylinder, and the port B is connected with a rod cavity of the mast oil cylinder. The invention can realize automatic retraction of the mast with high retraction efficiency, and rope disorder does not occur in the process of retraction.

Description

technical field [0001] The invention relates to a mast of a crawler crane, in particular to an automatic control hydraulic system for controlling the mast retraction of the crawler crane. The system is used for controlling the mast of the crawler crane to realize automatic lifting of the mast of the crawler crane. Background technique [0002] The traditional way of retracting and retracting the mast of crawler cranes usually uses the joint operation of multiple operators to realize the retraction and retraction. Use the remote controller outdoors to operate the mast oil cylinder, thereby realizing the retraction and retraction of the crawler crane mast. [0003] However, due to the manual operation, the speed of the hoisting action is uncoordinated during the operation. Therefore, the operator may cause the hoisting action to be too fast and cause the pre-tightening force of the wire rope to decrease, thereby causing the rope to be messed up. And because two operators are ...

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Problems solved by technology

[0003] However, due to the manual operation, the speed of the hoisting action is uncoordinated during the operation. Therefore, the operator may make the hoisting action too fast, resulting in a reduction in the pre-tightening force of the steel wire rope, thereby causing a messy rope.

In addition, due to the need for two operators to cooperate to complete the retracting action of the mast, not only the efficiency is low, but also there are many human control factors, it is difficult to ensure the coordination of the two operators

[0004] In addition, the traditional mast retracting operation method of crawler cranes always maintains the same system pressure when it is pulled up or down. Heavy is prone to vibration of the whole machine or the mast is used to passively press down the oil cylinder. The high-pressure stability of the oil cylinder is poor, and it is prone to potential danger of being bent

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