TBM vertical steering hydraulic system based on pressure compensation

Abstract

The invention discloses a TBM vertical steering hydraulic system based on pressure compensation. The system comprises a motor, a high-pressure pump, an electromagnetic unloading valve, a one-way valve, two fixed differential reducing valves, two three-position four-way electromagnetic proportional reversing valves, two shuttle valves, two balance valves, two displacement sensors, four hydraulic oil cylinders and an oil tank. The TBM (Tunnel Boring Machine) vertical steering hydraulic system adopts the fixed differential reducing valves and the three-position four-way electromagnetic proportional reversing valves to adjust the system working pressure and the flow, and realizes the change of a TBM pitching angle through controlling extension and shrinkage of the hydraulic oil cylinders. Meanwhile, the pressure compensation is realized through the shuttle valves and the fixed differential reducing valves. The TBM vertical steering hydraulic system based on pressure compensation can control TBM vertical postures in real time to reduce influence on displacements of the hydraulic oil cylinders by the load pressure fluctuation so as to guarantee the construction precision and the construction efficiency.

Description

technical field [0001] The invention relates to a TBM vertical adjustment hydraulic system, in particular to a pressure compensation-based TBM vertical adjustment hydraulic system. Background technique [0002] TBM attitude control means that the TBM adjusts the angle between the main girder and the tunnel design axis through the attitude adjustment mechanism according to the predetermined tunnel trajectory, so as to obtain good tunnel excavation accuracy. TBM attitude control can be divided into horizontal adjustment and vertical adjustment hydraulic systems. In the vertical adjustment hydraulic system, the vertical expansion and contraction of the oil cylinder drives the main girder to move up and down, so as to realize the change of pitch angle so as to make the TBM head up or knock down. [0003] The position deviation between the TBM trajectory and the tunnel design axis has a direct impact on the quality of the tunnel project. Due to the uneven geology during the excav...

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Problems solved by technology

[0005] In order to overcome the problems existing in the existing TBM vertical adjustment hydraulic system that the displacement of the hydraulic cylinder is greatly affected by the fluctuation of the load pressure, the geological adaptability is poor, and the adjustment action lags, etc., and to meet the construction requirements of hard rock excavation, the present invention provides a The TBM vertical adjustment hydraulic system based on pressure compensation uses a proportional reversing valve to control the vertical attitude of the TBM in real time, and combines the shuttle valve and differential pressure reducing valve to form a pressure compensation circuit, which reduces the impact of load pressure fluctuations on the hydraulic pressure. The impact of cylinder displacement ensures construction accuracy and construction efficiency

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