Pilot oil source control block of front high-pressure filter

Abstract

The invention belongs to the technical field of fluid pressure actuating mechanisms, and particularly discloses a pilot oil source control block of a front high-pressure filter, which has the structure that the oil inlet and oil outlet of the throttle valve of the control block are connected with the outlet of a main pump and the oil inlet of the high-pressure filter; the oil outlet of the high-pressure filter is connected with the oil inlet of a reducing valve; the oil outlet of the reducing valve is connected with the oil inlet of an one-way valve; the oil outlet of the one-way valve is connected with the oil inlets of an overflow valve, a first electromagnetic directional valve and a second electromagnetic directional valve as well as an energy accumulator respectively; and the oil outlets of the reducing valve, the overflow valve, the first electromagnetic directional valve and the second electromagnetic directional valve are all connected with the oil return opening of an oil tank. The pilot oil source control block of the front high-pressure filter has the benefits that the valve core of the reducing overflow valve can be prevented from being stuck by the impurities in the oil, and the slow motion or non-motion of the whole hydraulic excavator can be prevented.

Description

technical field [0001] The invention relates to a pilot oil source control valve group of a pre-high pressure filter, belonging to the technical field of fluid pressure actuators. Background technique [0002] The low-pressure oil of the pilot control system is supplied by the main pump that provides high-pressure oil, so the oil from the main pump must pass through the pressure relief valve and then enter the pilot control system. In the existing pilot oil source control valve group, the pressure relief and overflow are integrated into one valve, and there is no filter at the inlet of the valve group. The high-pressure oil at the outlet of the main pump directly enters the decompression and relief valve without passing through the throttle valve and high-pressure filter that limit the flow rate. After decompression becomes the pilot control pressure, the oil enters the accumulator, the first electromagnetic The reversing valve and the second electromagnetic reversing valve...

AI Technical Summary

Problems solved by technology

Since there is no throttle valve and high-pressure filter to limit the flow, impurities in the oil will enter the pressure relief valve and block the valve spool, and the oil will return to the oil tank through the overflow oil channel, while It cannot enter the accumulator, the first electromagnetic reversing valve and the second electromagnetic reversing valve. Therefore, the pressure of the pilot control system will be low or there will be no pressure, which will eventually cause the hydraulic excavator to move slowly or not.

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