The pump is composed of motor, transmission case and cylinder block. The transmission case is composed of a worm gear mechanism, a stroke adjusting mechanism and a crank connecting rod mechanism; The high adjustment stroke is realized by rotating the adjusting handwheel, so as to change the eccentricity of the moving shaft to change the stroke of the plunger (piston). The cylinder block is composed of pump head, suction valve group, discharge valve group, plunger and packing seals.

The motor drives the worm through the coupling and decelerates through the worm gear to make the main shaft and eccentric wheel rotate, and the eccentric wheel drives the sliding adjusting seat of the bow link for reciprocating motion. When the plunger moves backward to the dead point, a vacuum is gradually formed in the pump chamber, and the suction valve is opened to suck in liquid; When the plunger moves forward to the dead point, the suction valve is closed, the discharge valve is opened, and the liquid is discharged when the plunger moves further. In the reciprocating operation of the pump, continuous pressurized and quantitative discharge liquid is formed.

The flow of the pump is adjusted by rotating the adjusting handwheel to drive the adjusting screw to rotate, so as to change the distance between the bow connecting rods and the movement stroke of the plunger (piston) in the pump chamber to determine the flow. Adjust the scale of the handwheel to determine the plunger stroke, with an accuracy of 95%