Hydraulic distributor with stop valve function

Abstract

The invention discloses a hydraulic distributor with a stop valve function. The hydraulic distributor comprises a valve body, wherein the valve body is provided with a valve rod cavity, a limiting shaft cavity and a stop valve cavity, a valve rod is arranged in the valve rod cavity in a sliding mode, a limiting shaft is arranged in the limiting shaft cavity in a sliding mode, and a stop valve is arranged in the stop valve cavity; the limiting shaft is provided with an annular groove, and a hydraulic control oil port communicating with a pressure oil port is formed in the intersection of the limiting shaft cavity and the stop valve cavity; a boss is arranged at the end of a valve element of the stop valve and corresponds to the annular groove of the limiting shaft in position; and a valve rod groove is formed in one end of the valve rod and is provided with an outer side end face and an inner side end face, the limiting shaft is fixedly connected with a shifting fork, and the shifting fork is arranged in the valve rod groove in a sleeving mode. When the hydraulic control distributor is located in the ascending, descending and floating working positions, the stop valve can be automatically opened and kept without an electric control system and a linear actuating mechanism, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of hydraulic suspension devices, in particular to a hydraulic distributor with the function of a shut-off valve. Background technique [0002] The hydraulic suspension device of agricultural equipment (such as tractors) is used to connect suspended or semi-suspended agricultural implements, perform agricultural implement lifting and plowing depth adjustment, and realize loading and hydraulic power output, etc. The hydraulic suspension device consists of a hydraulic system and a suspension mechanism. The hydraulic system includes an oil pump, a distributor, a lifting cylinder, and an oil cylinder control mechanism. The suspension mechanism includes an upper pull rod, a lower rod, and a lifting arm. On the one hand, by manipulating the distributor, the raising, lowering, neutralization and floating of the agricultural implements can be realized, so that the tractor has the functions of position control, force ...

AI Technical Summary

Problems solved by technology

[0006] However, when the hydraulic distributor is in the floating working position, the main oil circuit of the hydraulic suspension device is in an unloaded state, and its oil pressure is not enough to overcome the elastic force of the return spring. In order to ensure that the stop valve can also be opened in this state, The electronic control system must be used to control the linear actuator to exert axial force on the globe valve spool, so the control system of the hydraulic control valve will become more complicated

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