Crusher equipment is the main equipment for mining, mainly for crushing stones of different sizes. The crusher equipment mainly includes a jaw crusher, impact crusher, impact crusher, double roll crusher, hammer crusher Cone Crusher, etc. Due to the harsh working environment and high compressive strength of the crusher, it is necessary for users to master the troubleshooting methods for common failures of the crusher.
Three major faults of the crusher: bearing fault maintenance, shaft fault maintenance, and stator and rotor iron core fault maintenance. Below we analyze the three major troubleshooting points:
1. Bearing fault repair and wear parts.
It is common for hammer mills that have been repaired and installed for the first time to vibrate strongly during the trial operation. This happens mainly for the following reasons:
1. The hammer is installed incorrectly during the inspection and assembly. In order to prevent the weight of the rotor from being unbalanced when the hammers are turned around, all the hammers in the pulverizer must be turned around at the same time, otherwise, strong vibration will occur during operation.
2. The difference between the weights of the corresponding two sets of hammers exceeds 5 grams. The method of exclusion is to adjust the weight of the hammer so that the difference between the corresponding two groups of weights is less than 5 grams.
3. Some hammers are stuck too tightly and are not thrown away during operation. It can be turned and observed by hand after the machine is stopped, and find a way to make the hammer rotate flexibly.
4. The weight of other parts on the rotor is unbalanced. At this time, it is necessary to carefully check and adjust the balance separately.
5. The main shaft is bent and deformed. The solution is to straighten or replace.
6. The bearing clearance exceeds the limit or is damaged. Generally, the problem can be solved by replacing the new bearing.
Second, the shaft fault maintenance
1. The journal is worn; when the journal is not worn much, a layer of chrome can be plated on the journal, and then ground to the required size; when there is a lot of wear, surfacing welding can be performed on the journal, and then the journal can be cut and polished on a lathe; If the journal wear is too large, turn 2-3mm on the journal, and then turn a sleeve, put it on the journal while it is hot, and then turn it to the required size.
2. The shaft is bent; if the shaft of the crusher is not bent much, it can be repaired by polishing the journal and the slip ring; if the bending exceeds 0.2mm, the shaft can be placed under the press, and the bending part can be pressurized and corrected. The surface of the corrected shaft shall be cut and polished with a lathe; if the bending is too large, a new shaft shall 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 part of the motor. The damage and deformation of the stator and rotor cores are mainly caused by the following reasons.
1. The bearing of the crusher is excessively worn or poorly assembled, causing the stator and rotor to rub against each other, which damages the surface of the iron core, which in turn causes a short circuit between the silicon steel sheets, increases the iron loss of the motor, and causes the motor temperature to rise too high. At this time, use tools such as fine files to remove burrs, eliminate short-circuits of silicon steel sheets, apply insulating paint after cleaning, and heat and dry.
2. Excessive force when removing the old winding causes the cogging to be skewed and flared outwards. At this time, use needle-nose pliers, wooden hammers, and other tools to trim them to reset the tooth slots, and add hard insulating materials such as green shell paper and glue board 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 cleaned with sandpaper and then painted with insulating paint after cleaning.
4. The high heat generated around the group grounding burns out the core slots or teeth. Use tools such as chisels or scrapers to remove the deposits, apply insulating paint, and dry.
5. The combination between the iron core and the base is loose, and the original positioning screws can be tightened. If the positioning screw fails, the positioning hole can be re-drilled on the machine base and tapped, and the positioning screw can be tightened.
