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Fault diagnosis method of excavator hydraulic pump

The fault diagnosis methods of excavator hydraulic pump can be divided into instrument diagnosis method and manual diagnosis method. The instrument diagnosis method is physical test. Artificial diagnosis method uses vision, touch, smell and hearing to diagnose the technical status and fault of hydraulic pump. Jining Xinsong machinery introduces some commonly used instrument detection and diagnosis methods for rapid oil quality analysis. The basic principle of oil quality rapid analysis is to reflect the aging degree of oil in use by synthesizing the change of dielectric constant. The rapid oil quality analyzer not only provides a quick and simple oil quality detection method for the hydraulic system of construction machinery, but also can monitor the operation status of the equipment through the regular detection of the oil in use, so as to prevent the occurrence of accidents. The traditional regular oil change mode in equipment management is changed, and the scientific oil change according to quality is realized. This method can quickly detect the physical and chemical properties of the hydraulic oil on site, and judge whether the hydraulic pump fault is caused by the deterioration of the hydraulic oil.

Hydraulic system tester. Since the pressure of the hydraulic pump of the excavator remains unchanged within the regulation range, the flow of the hydraulic pump can be measured by the hydraulic system tester to judge its working state. Hydrostatic testing machine is generally composed of pressure gauge, flowmeter, tachometer, etc. according to the connection mode of the testing machine in the pipeline, it can be divided into straight through test method and bypass test method. Install the tester on the high-pressure pipeline of the oil pump with the bypass method, make the oil pump run at the rated speed, and the hydraulic oil temperature is about 60 ℃. Observe and record the flow reading of the tester when it is no-load, and then load it with the loading valve, so that the load pressure gradually rises to the rated pressure of the system, observe and record the flow reading at this time. If the measured flow is 25% lower than the no-load flow, the hydraulic pump is faulty. If the flow reading decreases by 50%, it can be determined that the hydraulic system fault is caused by the hydraulic pump, and the excavator must be disassembled for maintenance.

Noise meter. The normal noise limit of excavator hydraulic pump is 105dB. If the limit is exceeded, it may be that the motor and pump drive shaft are not concentric, or the air entering the inside or the hydraulic pump is worn too much. thermometer. The fault is diagnosed by testing the difference between the temperature of the hydraulic pump shell and the temperature of the hydraulic oil. If the pump shell temperature is higher than 5 ℃, the change of oil temperature may be that the mechanical efficiency of the hydraulic pump is too low and the mechanical wear is large. If the temperature difference exceeds 10 ℃ and the system pressure setting is normal, the oil quality is normal, it may be due to large axial clearance, serious wear of hydraulic pump, reduced volumetric efficiency and increased leakage. Pressure gauge. Because the excavator hydraulic pump adopts constant pressure control, the pressure of the excavator hydraulic pump system can not reflect the working state of the hydraulic pump, but the pump fault can be judged by the swing of the pressure gauge pointer. If the deflection of the pressure gauge pointer exceeds ± 200 kPa or very slow swing is an abnormal phenomenon.

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Fault diagnosis method of excavator hydraulic pump

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