High temperature gear pump fault repair
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(2) Care should be taken to maintain the stability of the population pressure of the booster pump so that it has a stable volumetric efficiency in favor of the pump itself and the stability of the downstream spinning quality.
(3) The population is negative pressure of the packing shaft seal pump, the packing should be kept at a pressure higher than the atmospheric pressure. When the back pressure is reduced, the pressure of the stuffing box should be adjusted in time, otherwise the pump will be sucked into the air and the belt will be broken. This will affect the pelletizing and lead to the discharge of the pelletizer.
(4) to check the temperature of the heat medium jacket, the main body and the front and back cover of the heat medium temperature to be consistent.
(5) Every time the output increases, it is necessary to record the output, speed, output, inlet pressure and current value at the time, and compare the data before and after, and carefully analyze them so as to find the anomalies as soon as possible and deal with them in time.
2. Common faults and countermeasures are as follows:
(1) Failure phenomenon: the pump can not discharge the cause of the malfunction: a, the opposite direction of rotation; b, suction or discharge valve is closed; c, no inlet or pressure is too low; d, viscosity is too high, the pump can not bite material.
Countermeasures: a, confirm the direction of rotation; b, confirm the valve is closed; c, check the valve and pressure gauge; d, check the liquid viscosity, low speed operation according to the speed ratio of the flow appears, if the flow, the inflow is insufficient.
(2) Symptom: Insufficient pump flow Failure causes: a, suction or discharge valve is closed; b, the inlet pressure is low; c, the outlet pipe plugging; d, packing box leak; e, speed is too low.
Countermeasures: a, confirm whether the valve is closed; b, check the valve is open; c, confirm the discharge volume is normal; d, tighten; a large number of leaks affect production, should stop running, disassembly inspection; .
(3) Symptom: abnormal sound failure reasons: a, coupling eccentric or poor lubrication b, motor failure; c, reducer abnormalities; d, shaft seal at the installation of bad; e, shaft deformation or wear.
Countermeasures: a or find filling grease; b, check the motor; c, check the bearings and gears; d, check the shaft seal; e, parking disintegration inspection.
(4) Fault phenomenon: the current is too large Fault causes: a, the outlet pressure is too high; b, the melt viscosity is too large; c, shaft seal assembly bad; d, shaft or bearing wear; e, motor failure.
Countermeasures: a, check the downstream equipment and pipelines; b, test the viscosity; c, check the shaft seal, appropriate adjustments; d, check after parking, hand crank car is overweight; e, check the motor.
(5) Symptom: Sudden stop of pump Failure causes: a, power failure; b, motor overload protection; c, coupling damage; d, the outlet pressure is too high, interlocking reaction; Shaft and bearing stuck stuck.
Countermeasures: a, check the power; b, check the motor; c, open the safety cover, disk inspection; d, check the instrument interlock system; e, parking, reversing confirmation;
Note: The above symptoms and countermeasures are one to one correspondence 3. Measures to improve operating life (1) due to the pump body operating at high temperature, so cold installation piping should be set Hinge seat to prevent the pipe after the temperature shift.
(2) The coupling must be heat-corrected after the pump is warmed to avoid additional torque during operation.
(3) Pump outlet pressure measuring point to be set to stop interlocking alarm, otherwise, once the discharge pipe is blocked, easy to cause damage to the pump.
(4) When the pump is started, it can not be speed-raised blindly when no pressure is formed at the outlet to prevent premature failure of the shaft or bearing.
(5) When pipetting liquid, do not use pump to transport cleaning liquid. Remove inner part and install after pipetting to avoid foreign matter in the pump.
(6) The temperature of the pump heat medium jacket can be slightly lower than the heat medium temperature of the jacket tube. Because the melt viscosity and shear rate as a decreasing function, the gear extrusion, bearing shear will make the melt temperature rise after the pump 3 ~ 5 ℃, reduce the heat medium temperature to prevent the melt degradation. Data show that by reducing the bearing zone temperature can greatly increase bearing capacity, do not need to replace the large-capacity pump, just by increasing the speed can be used gear pump output capacity increased by 50%.
(7) Speed ​​to be slow, do not make a sharp rise in pressure before and after, in order to avoid damage to the bearings or melt blocked lubrication channel.
(8) After the pump outlet melt filter to be replaced regularly, do not long-term high pressure and pressure limit to run.
(9) Regular replacement of bearings can save maintenance costs. When it is found that the amount of wear on the inner surface of the shaft or bearing is close to the thickness of the hardened layer, the shaft can be polished and reused, replacing only the bearing. This prolongs the life of the shaft by 8 to 10 years.
(10) In case of power outage or heat medium cycle interruption more than 3Omin, the pump should be disassembled and cleaned before reassembly, so as to avoid damage to the pump due to poor lubrication of the bearing due to solidification and cracking of the melt.