Mechanical multiple automatic control oil recharging and discharging hydraulic diaphragm pump

The invention relates to a mechanical multiple automatic control oil recharging and discharging hydraulic diaphragm pump, and belongs to the technical field of displacement pumps. A diaphragm is installed in a main flow channel of the pump; a pump inlet end and a pump outlet end are respectively formed at two ends of the pump; a cylindrical piston is supported on one side of a pump body; an oil discharging servo limiting sliding valve and an oil recharging servo limiting sliding valve are installed in an inner hole of the cylindrical piston; a rear limiting structure of the oil discharging charging servo limiting sliding valve and a front limiting structure of the oil recharging servo limiting sliding valve are arranged in the inner hole of the cylindrical piston; a spring is installed between the two sliding valves; an oil discharging channel and an oil recharging channel on the cylindrical piston are respectively blocked when the pump is at a limiting state; the center of the diaphragm is fixedly connected with a valve opening cock shaft penetrating through centers of the oil discharging charging servo limiting sliding valve and the oil recharging servo limiting sliding valve; and an internal limiting structure of the oil discharging charging servo limiting sliding valve and an external limiting structure of the oil recharging servo limiting sliding valve are arranged on the circumcircle of the valve opening cock shaft. The pump ensures that the oil mass control during processes of oil discharging and oil recharging completely depends on the real-time status of the pressure in a hydraulic chamber, thereby realizing the oil mass accurate control, and improving the volume efficiency of the diaphragm pump.