1. The temperature of the main bearing is too high, causing pitting or melting, which may be caused by one of the following reasons:
1) Lubricating oil is interrupted or the oil quantity is insufficient. If oil is found to be broken, the feed water should be stopped immediately. Open the bearing cover and observe the hole cover. Try it by hand (be careful to prevent the handle from being burned) close to the hollow journal and check the bearing temperature. If the bearing has not been overheated, it can be stopped to handle the oil circuit failure; if the bearing temperature is already quite high, when the hand is close to the hollow shaft and feels hot and smokes, avoid stopping, and use artificial oil to cool from the bearing until the bearing temperature returns to normal. After parking. If the cooling is not taken, the bearing will not be burned, and a serious accident of "locking dead" of the hollow shaft and the large tile will occur.
2) Lubricating oil is too thick or too thin. Elimination method: Re-select the lubricating oil type; stop using cooling water or heat with resistance.
3) Oil deterioration The bearings and oil parts should be cleaned and the oil replaced.
4) The non-conformity of the large-wafer grinding scrape should be re-grinded to make it meet the technical requirements.
5) falls ore, scrap iron and other debris, damage the bearing surface, so that the surface roughness was observed, Undercutting Eliminate: cleaning bearings, journal bearings and repair. If a large area is melted, the melt torch bearing pasteurized or recast alloys; oil change.
6) Water in the lubricating oil Water can prevent the formation of the oil film, and cracks will occur at local points where there is no oil film, and pitting will occur. Elimination: Clean the bearings and replace the lubricant.
2. The grinding machine is difficult to start, the starting current of the motor is large, and there is an overload phenomenon.
Causes and elimination methods:
1) The medium and the ore in the grinding machine agglomerate, and the center of gravity severely punishes the side of the offset cylinder. In this case, when the mill is driven, the motor is not enough to overcome the eccentric moment, and the mill cannot be driven, and the overload phenomenon occurs.
Elimination method: Open the inlet cover, enter the cylinder and flip the medium with a crowbar to unload part of the medium.
2) Motor three-phase load imbalance Mainly refers to the motor three-phase current imbalance. The rotor of the motor is driven by the electromagnetic torque (ie, the rotating magnetic field) generated by the three-phase power source passing through the stator windings. When the three-phase current through the stator windings is balanced, the resulting electromagnetic torque is also unbalanced. If a phase current is not well contacted or leaked due to wire joints, the winding insulation is not good, etc., the current will be weakened, and the electromagnetic torque generated by the phase current passing through the stator winding will also decrease, so the grinding machine is difficult to start, and the motor appears to be super load.
Remedy: Disconnect the motor from the gearbox, start the motor under no-load load, check the current of each phase with a clamp-type ammeter, check the motor winding for a corresponding abnormal current, such as checking the insulation with a shaker. The cause of the problem was detected after driving.
3) There is ore or steel ball in the tank. For the closed-circuit grinding, if the ore and steel ball spit out from the grinding machine are not cleaned from the ore bin, or the mill stops, the classifier does not stop in time. The sand accumulates in the mine. When the mill is started, the spoon is blocked and a large eccentric moment is generated, causing the motor to be overloaded.
Remedy: Open the treatment hole at the bottom of the tank and clean the ore and steel balls.
3. The cylinder liner is connected to the bolt to leak the slurry.
Cause: The nut of the fixed lining is loose, the gasket is damaged, the screw is broken, and the lining is broken or detached.
Remedy: Tighten or replace the bolts, add a sealing gasket, and replace the liner if necessary.
1. The sound in the mill is weakened or enhanced.
The main reason for the weakening of the sound in the grinding machine is too much feeding, the block is too large, the feeding amount is larger than the discharge amount, and the grinding machine starts to swell.
The method of elimination is treated according to the method of excluding swelling.
The sound in the grinding machine is enhanced, which may be too little feeding, forming an empty grinding, and the medium directly hits the liner or the medium strikes each other. When the feed is normal and the sudden sound is aggravated, it is caused by the lining or the lattice plate falling off.
Elimination method: increase the feeding amount; if the lining plate falls off, stop immediately to replace or reassemble the lining.
2. The mill suddenly produces strong vibrations and impacts. The above phenomenon will occur for one of the following reasons:
1) The gear gap is mixed with iron impurities.
Elimination: Stop immediately, remove the shovel, and trim the flank.
2) The pinion gears move in the axial direction and collide with the gear box.
Elimination: Stop immediately, replace the gearbox, and re-fix the gears in the axial direction.
3) The gear is broken.
Elimination: Stop immediately and replace the gears.
4) Loose bearing or anchor bolts.
Elimination: First adjust the gears so that the large and small gears mesh correctly, then tighten the bolts.
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