Hydraulic support platform stand column oil cylinder system controlled by proportional servo valve and pressure control method

Abstract

The invention provides a hydraulic support platform stand column oil cylinder system controlled by a proportional servo valve and a pressure control method, and belongs to the technical field of valvecontrol hydraulic cylinder pressure control. An asynchronous motor is connected with a quantitative pump; a filter, the quantitative and the proportional servo valve are connected in sequence; the proportional servo valve is sequentially connected with a hydraulic lock and a stand column oil cylinder; the input end of the quantitative pump is separately connected with an oil tank through the filter, and the output end of the quantitative pump is connected with one port of the proportional servo valve; a proportional overflow valve is connected between a second port and a fourth port of the proportional servo valve; under the action of the quantitative pump, hydraulic oil outputs a certain flow of high pressure oil through the filter to control the stand column oil cylinder; the magnitude,adjusted by the proportional servo valve, of the flow of the hydraulic oil is changed, and the pressure of the stand column oil cylinder is controlled; and finally, low pressure oil of an oil outletof the stand column oil cylinder flows back into the oil tank under the guide of the proportional servo valve. The hydraulic support platform stand column oil cylinder system controlled by the proportional servo valve has the beneficial effects that the setting load of a roof of a temporary support of a fully-mechanized excavating roadway in a coal mine is precisely controlled, the negative influence of uncertain factors in the system on control performance is restrained, and the system has high robustness.

Description

technical field [0001] The invention relates to the technical field of valve-controlled hydraulic cylinder pressure control, in particular to a proportional servo valve-controlled hydraulic support platform column oil cylinder system and a pressure control method. Background technique [0002] During the comprehensive excavation process of coal mine roadway, the hydraulic support platform needs to implement fast and effective temporary support for the roof, so as to lay the foundation for the safe and reliable tunneling of coal mine roadway and provide protection for the life safety of front-line tunneling personnel in the coal mine. The pressure of the column cylinder of the hydraulic support platform directly affects the support ability of the hydraulic support for the advance support to the roof. Hydraulic support platform Column oil cylinder pressure is too low, it is easy to cause early separation of the roof, and even the roof collapse; too high column oil cylinder pre...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a proportional servo valve-controlled hydraulic support platform column oil cylinder system and pressure control method to solve the problem of internal / external interference and unmodeled uncertain factors in the proportional servo valve-controlled column oil cylinder system. unfavorable problem

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