Hydraulic control device of electro-hydraulic feedback proportional throttling cartridge valve

The utility model relates to a hydraulic control device of an electro-hydraulic feedback proportional throttling cartridge valve, in particular to a hydraulic control device for proportionally controlling the flow by a large flow pilot valve in engineering machinery. The device is in such a structure that an oil inlet and an oil outlet of a main valve are respectively arranged on the side face of a main valve sleeve, one end of a throttling groove of the main valve is communicated with a number 2 one-way valve while the other end of the throttling groove of the main valve is communicated with a cavity of the main valve, a displacement feedback rod of a control cover plate axial device and a displacement sensor. A pilot valve core is arranged in an axial hole of the pilot valve body, and a pivot spring is arranged between the pilot valve cover and a blind nut. A control oil opening is communicated with a number 1 one-way valve which is communicated with the cavity of the main valve. The control oil opening is communicated with a working oil opening of the pilot valve, the oil inlet of the pilot valve is communicated with the cavity of the main valve, and the pilot oil turn opening is communicated with one end of the pilot valve core. The hydraulic control device of the electro-hydraulic feedback proportional throttling cartridge valve has the effect of simple structure, convenience in operation, instantaneous start, proportional control, electro-hydraulic closed loop feedback control, high linearity, and online detection of position of the main valve core, and can be widely applied to the hydraulic control system in the engineering machinery industry.