Working principle of plunger pump: The plunger pump relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. When the plunger pump is working, under the action of the cam on the injection pump camshaft and the plunger spring, the plunger is forced to reciprocate up and down to complete the oil pumping task.
The plunger pump is divided into two representative structural forms: axial piston pump and radial piston pump. The plunger pump is mainly composed of two parts: the power end and the hydraulic end, and is equipped with a pulley, a check valve, a safety valve, a voltage stabilizer, a lubrication system, etc. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation.
Common troubleshooting of plunger pumps:
1. The hydraulic pump output flow is insufficient or no oil is output. The reason is that the gap of the pump is too large and the seal is poor. The damaged part of the pump can be judged by checking the foreign matter mixed in the hydraulic oil in the pump body.
2. The oil discharge volume is not zero when in the middle position. When the inclination angle of the swash plate of the variable axial piston pump is zero, it is called the neutral position, and the output flow of the pump should be zero at this time. However, sometimes the neutral position deviates from the midpoint of the adjustment mechanism, and there is still flow output at the midpoint. The reason is that the position of the controller is deviated, loose or damaged, and it needs to be re-zeroed, tightened or replaced.
3. Output flow fluctuation. Unstable flow is often accompanied by pressure fluctuations. This type of fault generally requires disassembling the hydraulic pump, replacing damaged parts, increasing damping, increasing spring stiffness and control pressure, etc.
