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The working principle of the plunger pump: The plunger pump relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil absorption and pressure. When the plunger pump is working, under the action of the cam on the camshaft of the fuel injection pump and the plunger spring, the plunger is forced to reciprocate up and down to complete the oil pumping task.
Piston pumps are divided into two representative structural forms, axial piston pumps and radial piston pumps. The plunger pump is mainly composed of two parts, the power end and the hydraulic end, with a belt pulley, a check valve, a safety valve, a voltage stabilizer, and a lubrication system. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment.
Common troubleshooting of plunger pumps:
1. The output flow of the hydraulic pump is insufficient or does not output oil. The reason is that the gap of the pump is too large and the seal is not good. 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 is not zero in the neutral 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 midpoint 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 needs to be re-zeroed, tightened or replaced.
3. The output flow fluctuates. Unstable flow is often accompanied by pressure fluctuations. Such failures generally require disassembling the hydraulic pump, replacing damaged parts, increasing damping, increasing spring stiffness and control pressure.