Home>Bearing knowledge>Traffic motor bearing damage caused repair failure of traction system speed instability

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Damage to the traction motor bearing causes repair failure of the traction system

Source: China Bearing Network Time: 2018-02-14

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The traction system uses a crawler-type tractor. Its function is to supply the drafting power and traction speed of the profile that has been extruded by the main machine to the starting shape and scale; the profile is evenly extracted. The tractor consists of three major systems: Rack system; traction power system and pneumatic compression system. The traction motor is part of the traction power system; two rare earth DC speed-regulating motors are selected; its action flow is from the traction motor through the synchronous pulley; The gear reducer; the sprocket on the track body; the power source that constitutes the tractor. The control used for the traction motor is the 512C speed control device of the British Continental Company. The traction system is unstable and usually has the following reasons:
(1) There is a problem with the motor brush (including the speed measuring motor); the brush is ectopic or a large electric spark occurs.
(2) The potentiometer has a problem.
(3) Mechanical problems; the gearbox is short of oil or gear damage.
According to the past work experience; the problem of the local traction system is usually caused by brush ignition; because it directly reflects the rotation speed is swaying; so; when the staff is repairing; I have done the disposal according to the previous method. Check the condition of the brush; adjust the pressure of the brush pressure spring; replace the two shorter brushes. Because the motor is sealed; I also use the tight air to blow the brush powder inside. But the problem is still Exist. I looked at the speed measuring motor; there is no problem. So; remove the motor power cord (connected to a 60 watt white woven lamp); no load test. The 512C output voltage is very stable; the conditioning potentiometer is also very stable. This eliminates the problem of speed control devices and potentiometers. As long as the gearbox has not been viewed. The mechanical repairman is asked to open the gearbox together; the lubricant inside is dirty; after dumping, the gear is removed with gasoline; Found the problem. Installed from the head; participate in the new lubricant. Power test; the problem is still not handled. It seems that the problem is still electrical; through another serious review; put the problem on the motor Through the consent of the leader; I removed another motor of the same type on the other production line; after replacing the motor; the problem was ruled out; in the past; the repair of the motor was sent to the repair shop; but the production task was very tight; Moreover, the repair cost of this kind of motor is very high; so the leader let us personally repair. The whole motor is sealed; even the brush is sealed. I have never removed this kind of motor; I don't know how to start it; so I am on I checked some repair experience and disassembly method of rare earth DC speed regulating motor; listed a disassembly part; turned the motor on. The process is as follows: Step 1: Remove the motor brush (a total of six pieces) and do Good symbol; prevent the device from messing up. Step 2: Remove the aviation socket. Step 3: Remove the speed measuring motor. This step is very important; be careful; remove the fixing screw; take the outer casing of the speed measuring motor ( When the brush holder is used, it should be careful not to damage the power cord when it is connected with the power cord of the main motor. Then remove the rotor of the speed measuring motor. Step 4: Open the front and rear end caps of the motor; Have to do the orientation first Marking; avoid unnecessary troubles when installing from scratch. Rare earth DC speed control motor removes the speed measuring motor; its layout is not messy; however; turning the motor end cover down to take the motor rotor time; still encountered Difficult; the stator layout of this kind of motor is permanent magnet convex plate type; the rare earth permanent magnet data is selected; the suction force of the permanent magnet is very strong; the rotor cannot be taken out; the method of processing is not found at the end; after the motor is disassembled, the motor power line is found to be virtual The appearance of the motor; and the motor bearing is also severely short of oil; replace a pair of new bearings; external power supply leads; install the motor in reverse order; test from the beginning;

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