Hydraulic cylinder control valve without unloading impact resonance

Abstract

The invention discloses a hydraulic cylinder control valve without unloading impact resonance, which overcomes the problem that impact resonance is generated by the unloading of a hydraulic control one-way valve of a conventional hydraulic cylinder. The hydraulic cylinder control valve without unloading impact resonance is characterized in that: a sealing diameter of a valve opening of a first valve core inside a valve body is same as a diameter of a sealing section and a diameter of a liquid return section; and the diameter of a control section is smaller than the diameter of a liquid return section. The beneficial effects are that: as the sealing diameter of the valve opening of a first valve core is same as the diameter of the sealing section and the diameter of the liquid return section, the unloading impact resonance problem of the control valve of the hydraulic cylinder is solved; as the sealing diameter of the valve opening, the diameter of the sealing section and the diameter of the liquid return section can be increased equivalently, and the diameter of the control section can be reduced at will based on a need, the control pressure is unlikely too low, and no false operation is generated; and a secondary-hole one-way valve arranged in a secondary hole inside the valve body or a plate-shaped connecting one-way valve or a tubular one-way valve outside the valve body are used for raising a column, so that needs of big channel for dropping the column, a small channel for raising the column, and joint control of a balancing jack and a lifting jack while the column is raised are satisfied.

Description

technical field

[0001] The invention belongs to the technical field of hydraulic control, in particular to a hydraulic cylinder control valve without unloading impact resonance for coal mine hydraulic supports. Background technique

[0002] Such as figure 1 As shown, in the prior art, the column, the front beam and the tail beam hydraulic cylinder of the coal mine hydraulic support are all controlled by the hydraulic control check valve 100, and hydraulic shock resonance will be generated when the hydraulic control check valve is unloaded. Taking the column as an example, When lifting the column, the high-pressure liquid opens the check valve core 103 of the hydraulic control check valve, leaves the valve seat 102 of the hydraulic control check valve and enters the lower chamber of the column, forcing the live column to rise, and the upper end of the live column is lifted to contact with the top beam of the hydraulic support and Firmly support the roof and keep a roof on th...

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