Screw conveyor gate speed control hydraulic system of shield machine material hoisting device

Abstract

A screw conveyor gate speed control hydraulic system of a shield machine material hoisting device comprises a safety valve which is connected with a hand-operated direction valve set. The two ends ofthe hand-operated direction valve set are correspondingly connected with the two ends of an oil cylinder so as to control ascending or descending of the oil cylinder. A balance valve is further arranged between one end of the hand-operated direction valve set and a first cavity of the oil cylinder. An outlet of the balance valve is connected with a second cavity of the oil cylinder. An overflow valve is arranged at the front end of the balance valve. A pressure compensation flow control valve is further arranged between the other end of the hand-operated direction valve set and the second cavity of the oil cylinder, and used for guaranteeing that the walking speed cannot be suddenly changed due to misoperation of workers during segment hoisting and the front-back swing amplitude of segments can be reduced. The screw conveyor gate speed control hydraulic system of the shield machine material hoisting device has the beneficial effects that by newly adding the pressure compensation flow control valve, it is guaranteed that operators can conveniently and effectively operate a segment hoisting system, and walking safety of the segment hoisting system is improved.

Description

technical field [0001] The invention provides a speed control hydraulic system for a screw machine gate of a shield machine material hoisting device, which belongs to the field of shield tunnel construction. Background technique [0002] At present, the main disadvantage of the material lifting system of the full-face tunnel boring machine shield machine is that when lifting the segment, the walking speed of the crane is controlled by operating the manual reversing valve, and the manual reversing valve is difficult to effectively control the walking speed of the crane. Operators operate the valve differently. As for the lifting and transporting of the segment, the speed is suddenly fast and slow, and the swing of the segment back and forth is too large, which may easily cause safety hazards. In order to solve the above-mentioned technical problems, CN201428459Y is disclosed by the Chinese Patent Office, which is a shield propulsion hydraulic system with mixed pressure and ve...

AI Technical Summary

Problems solved by technology

[0002] At present, the main disadvantage of the material lifting system of the full-face tunnel boring machine shield machine is that when lifting the segment, the walking speed of the crane is controlled by operating the manual reversing valve, and the manual reversing valve is difficult to effectively control the walking speed of the crane. Operators operate the valves differently. As for the speed of lifting the segment, the speed is fast and slow, and the swing range of the segment is too large, which may cause safety hazards

In order to solve the above technical problems, the Chinese Patent Office has disclosed CN201428459Y, which is a shield propulsion hydraulic system with mixed pressure and velocity control, but its structure is complex and its response speed is relatively slow.

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