The maintenance of a plunger pump generally consists of main components such as the cylinder body, oil distribution plate, plunger, and inclined plate. There are multiple plungers in the cylinder body, and the plungers are arranged axially, that is, the centerline of the plungers is parallel to the axis of the transmission shaft, so it is called plunger pump maintenance. But it is different from reciprocating piston pumps because its plunger not only performs reciprocating motion inside the pump cylinder, but also rotates relative to the inclined plate between the plunger and the pump cylinder. The plunger contacts the inclined plate with a spherical end. There are high and low pressure moon shaped grooves on the oil distribution plate, which are separated by partition walls to ensure a certain degree of sealing. They are respectively connected to the inlet and outlet of the pump. There is a tilt angle between the axis of the inclined plate and the axis of the cylinder block. The working principle of plunger pump maintenance is that when the electric motor drives the transmission shaft to rotate, the pump cylinder and plunger rotate together, and the plunger head always maintains contact with the inclined plate. Because the inclined plate forms an angle with the cylinder body, when the cylinder body rotates, the plunger performs reciprocating motion in the pump cylinder. Piston from 0° Go to 180°, Turning to the position of the upper plunger, the volume of the plunger cylinder gradually increases, so the liquid is sucked into the oil cylinder through the oil suction port a of the distribution plate; And the plunger is from 180° Go to 360° As the volume of the plunger cylinder gradually decreases, the liquid in the cylinder is discharged through the outlet of the distribution plate. As long as the drive shaft continues to rotate, the pump will continue to work.