Maintenance of common motor faults during use of crusher
Crushers often affect production due to motor failures during use. The main failure phenomena are: 1. stator and rotor core failure inspections; 2. bearing failure inspections; 3. rotating shaft failure inspections.
1. Troubleshooting of stator and rotor cores
The stator and rotor are made of mutually insulated silicon steel sheets, which are the magnetic circuit parts of the motor. The damage and deformation of the stator and rotor cores are mainly caused by the following reasons.
① Excessive wear of the bearing or poor assembly will cause the stator and rotor to rub together, damage the surface of the iron core, and then cause a short circuit between the silicon steel sheets, increase the iron loss of the motor, and increase the temperature of the motor. At this time, use fine files and other tools to remove the burrs, eliminate the short-circuit of the silicon steel sheet, clean it up, apply insulating paint, and heat and dry it.
② Excessive force is used when removing the old winding, which makes the stolen slot skew and open. At this time, use needle-nose pliers, wooden hammers and other tools to trim, reset the tooth slot, and add hard insulating materials such as blue shell paper and bakelite between the silicon steel sheets with gaps that are not easy to reset.
③ The surface of the iron core is corroded due to moisture and other reasons. At this time, it needs to be polished with sandpaper, and then coated with insulating paint.
④The surrounding group grounding generates high heat and burns the iron core groove or the teeth. Use tools such as chisel or scraper to remove the fused deposits and apply insulating paint to dry.
⑤The combination between the iron core and the base is loose, and the original positioning screws can be tightened. If the positioning screw fails, drill and tap the positioning hole in the red star of the machine base to tighten the positioning screw.
2. Bearing fault maintenance
The rotating shaft is supported by the bearing to rotate. It is the heaviest part and the part that is easy to wear.
Check during operation;
When the rolling bearing is short of oil, you will hear the sound of “gulugulu”; if you hear the discontinuous “stalking” sound, it may be that the bearing steel ring is broken. When the bearing is mixed with debris such as sand or the bearing parts are slightly worn, a slight noise will be produced.
Check after disassembly;
First check the bearing rolling elements, inner and outer steel rings for damage, corrosion, scars, etc., and then pinch the bearing inner ring with your hands and make the bearing level, and push the outer rigid ring with the other hand. If the bearing is good, the outer steel ring The rotation should be stable, there should be no vibration and obvious blocking phenomenon during rotation, and the outer steel ring should not retreat after stopping. Otherwise, the bearing can no longer be used. Hold the outer ring with your left hand, pinch the inner steel ring with your right hand, and push hard in all directions. If you feel loose when pushing, it means serious wear.
The rust spots on the outer surface of the bearing can be wiped off with No. 00 sandpaper and then cleaned in gasoline; or when the bearing is cracked, the inner and outer rings are broken, or the bearing is excessively worn, replace the bearing with a new one. When replacing a new bearing, use the same bearing as the original model.
3. Rotating shaft troubleshooting
If the bend is not large, it can be repaired by polishing the journal and slip ring; if the bend exceeds 0.2mm, the shaft can be placed under the press, and the bend can be pressure-corrected, and the corrected shaft surface can be cut with a lathe Polished; if the bend is too large, a new shaft needs to be replaced.
②Axle journal wear;
When the journal wear is not large, you can plate a layer of chromium on the journal, and then grind to the required size; when there is more wear, you can perform overlay welding on the journal, and then cut and polish on the lathe; if the journal is worn When it is large, turn 2-3mm on the journal, then turn a sleeve, put it on the journal while it is hot, and then turn to the required size.
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