Hydraulic system for adjustment of level posture of hard-rock heading machine

Abstract

The invention discloses a hydraulic system for adjustment of a level posture of a hard-rock heading machine. The hydraulic system comprises a motor, a high-pressure pump, an electromagnetic unloading valve, six one-way valves, three proportional pressure reducing valves, a three-unit-four-passage electromagnetic proportional directional valve, two two-unit-three-passage electromagnetic directional valves, a two-unit-two-passage electromagnetic directional valve, a uniform-pressure-drop valve, a shuttle valve, two compensated flow control valves, two proportional overflow valves, a balance valve, two three-unit-four-passage electromagnetic directional valves, a two-unit-four-passage electromagnetic directional valve, a displacement sensor, two pressure sensors, six hydraulic cylinders and a fuel tank. According to the hydraulic system for adjustment of the level posture of the hard-rock heading machine, the influence of loading pressure surge on the displacement of the boot-supporting hydraulic cylinders can be reduced, the deviation of a track posture can be rectified rapidly, and the disturbing force of the hard-rock heading machine is reduced when the level posture is adjusted; and the problem that a tunnel deviates a preset track is solved, the forming quality of the tunnel is improved, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to a hydraulic system for adjusting horizontal attitude, in particular to a hydraulic system for adjusting horizontal attitude of a hard rock roadheader. Background technique [0002] The attitude adjustment of the hard rock roadheader refers to adjusting the angle between the main beam and the tunnel design axis through the attitude adjustment mechanism according to the predetermined tunnel trajectory, so as to obtain good tunnel excavation accuracy. When the horizontal posture is adjusted, the stretcher shoes hold the cave wall tightly, and the large cavity of the stretcher cylinder is filled with high-pressure oil. Beam rotation achieves horizontal attitude adjustment. [0003] Attitude control of hard rock TBMs plays a vital role in the construction process. Whether the accuracy of fuselage attitude control is directly related to the quality of tunnel excavation. Insufficient attitude control of the fuselage will cause over...

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Problems solved by technology

[0005] In order to overcome the problems that the displacement of the hydraulic cylinder in the horizontal attitude adjustment of the existing hard rock roadheader is greatly affected by the fluctuation of the load pressure, the mechanical components are damaged and the tunnel deviates from the predetermined track, the present invention provides a hydraulic cylinder for horizontal attitude adjustment of the hard rock roadheader. The system uses a proportional reversing valve to adjust the horizontal attitude of the hard rock roadheader, and at the same time adopts a group control method for the left propulsion cylinder and the right propulsion cylinder, which improves the tunnel forming quality and speeds up the construction progress

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