Acoustic diagnostic method
The acoustic diagnosis method is based on the oil pumping of the gear pump in the hydraulic system, gear meshing, poor matching clearance, fluid noise and structural noise, and the noise frequency band is wide. Therefore, the sound source, mechanism and characteristics of these noises are studied. With frequency composition, condition monitoring and fault diagnosis can be performed on the gear pump.
The parametric diagnosis method diagnoses the working state of the equipment by detecting certain parameters of the gear pump, such as vibration, noise, pressure, flow, floor area ratio, leakage amount, and the like.
In practice, it is often necessary to use the above methods in combination to make a positive diagnosis.
Analysis of common fault diagnosis of gear pump
No oil discharge
The cause of the malfunction: a) the motor is not turning correctly; b) the inlet and outlet valves are closed; c) the suction port is free of oil; d) the viscosity of the oil is too high to be inhaled.
Diagnosis: a) Turn the direction of rotation; b) Check if the valve is open; c) Check the amount of oil in the tank. When operating at low speed, do you have a flow rate proportional to the speed? If there is flow, the flow is insufficient; d) Check the viscosity of the liquid.
2. Less traffic
Causes of failure: a) The suction or discharge valve is not fully open; b) the inlet pressure is low; c) the outlet line is clogged; d) there is a leak; e) the speed is low.
Diagnosis: a) Check if the valve is fully open; b) Check the inlet oil; c) Clear the pipeline blockage; d) Fasten the seals, if the leakage is large, stop the inspection; e) Detect the pump input shaft Actual speed.
3. Noise is abnormal
Causes of failure: a) The pump and motor coupling are eccentric or poorly lubricated; b) the motor is faulty; c) the transmission is faulty; d) the shaft is deformed or worn.
Diagnosis: a) Coupling correction or improvement; b) Checking the motor's own noise; c) Diagnosing the gears and bearings; d) Stopping the opening and checking.
4. The current is too large
Causes of failure: a) Excessive outlet pressure; b) Gear shaft or shaft package not in place; c) Bearing or shaft wear is large; d) Motor failure.
Diagnosis: a) Check the pump load, whether the load is too large or the pipeline is blocked; b) Check the assembly and adjust it properly; c) First check the bearing status during operation, then stop the inspection, you can use the hand plate to turn the shaft. Card shaft phenomenon; d) Motor inspection.
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