Failure law of hydraulic pump of hydraulic excavator
Date:
2023-11-03
The main component of the piston pump is the bearing. Assuming that the bearing has clearance, the normal space of the three pairs of friction pairs of the hydraulic pump cannot be filled.
The main component of the piston pump is the bearing. Assuming that the bearing has clearance, the normal space of the three pairs of friction pairs of the hydraulic pump cannot be filled. Together, the thickness of the hydrostatic support oil film of each friction pair will be damaged, and the service life of the piston pump bearing will be reduced.According to the materials supplied by the hydraulic pump manufacturer, the uniform service life of the bearing is 10000h. This value requires the bearing to be disassembled. The clearance of the bearing cannot be checked without an inspection instrument. Visual inspection can only be used. If the surface of the roller is found to be scratched or discolored, it will be replaced.The hydraulic pump is the power source of the hydraulic system of the excavator, and it is an energy conversion device that converts mechanical energy into hydraulic energy.In hydraulic excavators, the hydraulic pump is also a component with many shortcomings, and once the hydraulic pump has shortcomings, it will immediately affect the normal operation of the excavator's hydraulic system and will not be able to operate.
1. Among the common shortcomings of gear pumps, most of them are caused by the wear and tear of their gear pairs.Its normal wear and tear causes radial and axial vacancies (that is, cross-section vacancies), which exacerbates the leakage in the gear pump, and the pump hole or both ends cannot be corrected when it is serious.In addition, the seal of the shaft is also a component that is often damaged.
2. Vane pumps are different from gear pumps, their normal wear and tear is very small, and the service life of the components is long.The reason for the shortcomings of the vane pump is oil pollution. This is because the movement of the vane pump is relatively precise. When pollutants enter the movement of the vane, it will briefly stagnate or wear out.Others, the self-priming function of the vane pump, the gear pump, is a small displacement vane pump, so whether the oil is cleaned and whether the oil is absorbed are the two questions that need to be paid attention to in the operation of the vane pump.
3. The disadvantages of the radial plunger pump in the plunger pump in terms of structure and motion function are the large radial force, poor self-priming and adjustment, and the high coordination accuracy of the plunger and the plunger hole; the machining accuracy of the axial plunger pump is high.Therefore, the cleaning degree of the oil by the plunger pump is high, that is, the filtration accuracy of the oil by the plunger pump is higher than that of the gear pump.
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