Analys av gemensamma svaghetsproblem hos grävmaskiner

1. Motorkraften är tillräcklig och den fungerar normalt, men grävmaskinen fungerar långsamt och har svag grävningskraft .

2.The hydraulic pumps of excavators are mostly variable piston pumps. After working for a certain period of time, the internal parts of the pump inevitably wear out, causing internal leakage. The data of various parameters are not coordinated, resulting in insufficient flow, excessively high oil temperature, slow speed, and inability to establish high pressure. Therefore, the operation is slow and weak. For such issues, the hydraulic pump must be removed for data measurement to confirm the problem, replace the parts that can no longer be used, or repair the parts that can still be used. After reassembly, it should be put on the calibration bench for debugging to match the parameters of each circuit (pressure, flow rate, power and variabler, etc .) .

3. An important hydraulic component on an excavator is the multi-way distribution valve, which includes a main safety valve, a secondary valve, a relief valve, an oil replenishment valve, etc. If the pressure set by these valves fails to reach the standard pressure, it will result in weak excavation. In addition, if the gap between the valve stem and the valve hole is too large due to wear, the valve stem does not return to its original position completely and the reversing is not in place, there will be a large amount of internal leakage, resulting in insufficient flow and slow speed. For such problems, the multi-way distribution valve should be removed and sent to the test bench for debugging. The pressure of all valves should be reset to the standard pressure, and the gap between the Ventilstam och ventilhålet ska elimineras .