A complete gear pump includes a motor, reducer, coupling and pump head several parts, the pump head part of the pump housing, front and rear side cover, gear shaft, sliding bearings and shaft seal composition. High-temperature gear pump is a positive displacement pump, work rely on the main, driven gear changes caused by the work volume changes to transport the melt. Working volume by the pump body, gear tooth groove and the function of the side plate with the composition. When the gear rotates, the melt enters the tooth grooves of the two gears of the suction chamber. As the gear rotates, the melt is brought into the discharge cavity from both sides, and the gears mesh again to make the melt in the tooth grooves to be squeezed out Cavity, pressure delivery to the outlet pipe. As soon as the pump shaft is turned, the gear presses the melt down to the outlet side so that the pump outlet can reach very high pressure with little or no effect on flow and discharge pressure. 1, routine maintenance (l) pump disintegration and cleaning, heating, cooling, starting and stopping should be strictly in accordance with the provisions of the operation to avoid unnecessary losses. (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, 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 cause 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, the common faults and countermeasures are as follows: (1) Symptom: the pump can not discharge the cause of the malfunction: a, the opposite direction of rotation; b, suction or discharge valve is closed; c, the inlet without material or pressure is too low; d, viscosity is too high , The pump can not bite countermeasures: a, confirm the direction of rotation; b, confirm whether the valve is closed; c, check the valve and pressure gauge; d, check the viscosity of the liquid to low speed operation by the speed ratio of the flow rate is there, (2) Failure phenomenon: insufficient pump flow Failure causes: a, suction or discharge valve is closed; b, the inlet pressure is low; c, outlet pipeline plugging; d, packing box leakage; 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; Phenomenon: Abnormal sound Fault causes: 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, find Or filling grease; b, check the motor; c, check the bearings and gears; d, check the shaft seal; e, parking disintegration check (4) Symptom: current is too large Fault causes: a, outlet pressure is too high; Body viscosity is too large; c, shaft seal assembly bad; d, shaft or bearing wear; e, motor failure measures: a, check the downstream equipment and pipelines; b, test viscosity; c, check the shaft seal, appropriate adjustments; After the inspection, the hand crank car is too heavy; e, check the motor (5) Symptom: pump suddenly stopped Fault causes: a, power outage; b, motor overload protection; c, coupling damage; d, the outlet pressure is too high , Interlock reaction; e, bite abnormal pump; f, shaft and bearing adhesion stuck measures: a, check the power supply; b, check the motor; c, open the safety cover, disk inspection; d, check the instrument interlock system ; E, after parking, reversing confirmation; f, turning the car to confirm Description: The above symptoms and countermeasures are one to one correspondence In addition, increase operating life should pay attention to: 1, due to the pump in high temperature operation, State installation piping should be set up hinge support Block, to prevent the pipe displacement after warming. 2, the coupling must be heat pump after heating to find the correct, in order to avoid running additional torque. 3, the pump outlet pressure measuring point to be set to stop interlocking alarm, otherwise, once the discharge pipe blocked, easy to cause damage to the pump. 4, the pump starts, no pressure in the export formation, you can not blindly speed, to prevent premature failure of the shaft or bearing. 5, cleaning pipetting, do not pump delivery of cleaning fluid, the inner part should be removed, pipetting after the end of installation, so as to avoid foreign matter in the pump. 6, the temperature of the jacket heat medium jacket can be slightly lower than the jacket before and after the heat medium temperature. 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 the sharp rise in pressure before and after, in order to avoid damage to the bearings or melt blocked the lubrication channel. 8, after the pump outlet melt filter to be replaced on a regular basis, 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 interrupt more than 3Omin, the pump should be disassembled after cleaning and reassembly, so as to avoid melt curing, cracking and other causes poor bearing lubrication and pump damage.
It Magnets,Magnet For Mobile Phone,Permanent Neo Magnet
Hawell Magnetics Co., Ltd. , http://www.nbdfebmagnetic.com