Main points of maintenance of three major failures of crusher

As the main equipment for mine production, crusher equipment is mainly used for crushing stones of different sizes. The crusher equipment mainly includes jaw crusher, impact crusher, impact crusher, double-roll crusher, hammer crusher and Cone crusher and other equipment.

Introduction to the troubleshooting points of the crusher

Three major faults of the crusher: bearing fault maintenance, rotating shaft fault maintenance and stator and rotor core fault maintenance. Below we will analyze the three main troubleshooting points:

1. Check and repair worn parts

The rotating shaft is supported by the bearing to rotate. It is the heaviest part and the part that is easy to wear.

①Fault check

Check during operation; when the rolling bearing is short of oil, you will hear the sound of "gulugulu"; if you hear the discontinuous "stemming" sound, it may be that the bearing steel ring is broken. When the bearing is mixed with sand and other debris or the bearing parts are slightly worn, a slight noise will be produced.

Check after disassembly; first check whether the crusher bearing rolling elements, inner and outer steel rings are damaged, rusted, scars, etc., then pinch the bearing inner ring with your hand, and make the bearing level, and push the outer rigid ring with the other hand. The bearing is good, the outer steel ring should rotate smoothly, there is no vibration and obvious blocking phenomenon during rotation, and the outer steel ring should not regress 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.

②Fault repair

The rust spots on the outer surface of the bearing can be wiped off with 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.

2. Rotating shaft troubleshooting

①Axle journal wear; when the journal wear is not large, a layer of chromium can be plated on the journal and then ground to the required size; when there is more wear, the journal can be surfacing and then cut and polished on the lathe; If the journal is worn too much, 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.

②The shaft is bent; if the crusher shaft is not bent too much, it can be repaired by polishing the journal and slip ring; if the bending exceeds 0.2mm, the shaft can be placed under the press, and the bend can be compressed and corrected. The surface of the rear shaft is cut and polished with a lathe; if the bending is too large, a new shaft must be replaced.

3. 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 crusher bearings or poor assembly will cause the stator and rotor to rub together, damage the surface of the iron core, and 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 windings, which causes the cogging to be skewed and open. At this time, use needle-nose pliers, wooden hammers and other tools to trim, to reset the alveolar, and add hard insulating materials such as green shell paper and bakelite between the silicon steel sheets with gaps that are not easy to reset.

③The 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.

④ High heat generated around the group grounding burns the core groove or the tooth. Use tools such as chisel or scraper to remove the 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, re-drill the positioning hole on the machine base and tap it, and tighten the positioning screw.