The pulverizer is one of the main equipment used in feed factories to produce feed. The reliability of the operation of the pulverizer directly affects production efficiency and the normal operation of subsequent processes. Therefore, it is particularly important for maintenance and operators to learn to analyze and handle common faults in the pulverizer system, eliminate them in the short term, and resume production as soon as possible. The pulverizer system mainly includes a pulverizer and an electric motor. The corresponding faults can be divided into mechanical faults and electrical faults. The following is an analysis of mechanical failures, vibration, bearing heating, and crusher screen blockage.

1. The vibration of the crusher is generally connected directly to the crushing device by a motor, which is simple and easy to maintain. However, if the two cannot be connected well during the assembly process, it will cause the overall vibration of the crusher.

(1) The motor rotor is not concentric with the crusher rotor. The position of the motor can be moved left or right, or a pad can be added under the motor foot to adjust the concentricity of the two rotors.

(2) The pulverizer rotor is not concentric. The reason is that the two supporting surfaces of the palm rotor shaft are not in the same plane. Copper sheets can be placed on the bottom surface of the support bearing seat, or adjustable wedges can be added at the bottom of the bearing to ensure that the two shaft heads are concentric.

(3) The vibration in the crushing chamber is relatively high. The reason is that the connection between the coupling and the rotor is not concentric or the quality of the flat hammer inside the rotor is uneven. Corresponding methods can be adopted to adjust the connection between the coupling and the motor according to different types of couplings: when the quality of the hammer pieces is uneven, each group of hammer pieces must be re selected to make the symmetrical hammer pieces, so that the error of the symmetrical hammer pieces is less than 5G.

(4) The original balance has been disrupted. After the motor is repaired, a dynamic balance test must be conducted to ensure the overall balance.

(5) The foundation bolts of the crusher system are loose or the foundation is not firm. During installation or maintenance, the foundation bolts should be evenly tightened. A shock absorber should be installed between the foundation and the crusher to reduce vibration.

(6) There are hard debris in the broken or crushed hammer chamber. All of these can cause imbalance in rotor rotation and cause vibration of the entire machine. Therefore, regular inspections should be carried out for severely worn hammers. When replacing, it is necessary to replace symmetrically; Any abnormal sound during the operation of the crusher should be immediately stopped for inspection, and the cause should be identified and promptly addressed.

(7) The connection between the pulverizer system and other equipment does not match. For example, improper connection of feed pipes, discharge pipes, etc. can cause vibration and noise. Therefore, it is not advisable to use hard connections for these connecting parts, and it is best to use soft connections.

2. Overheating bearings are important accessories on crushers, and their performance directly affects the normal operation and production efficiency of the equipment. During the operation of the equipment, users should pay special attention to the temperature rise of the bearings and the noise in the bearing parts, and handle any abnormalities as soon as possible.

(1) The unevenness of the two bearing seats, or the misalignment between the motor rotor and the crusher rotor, can cause the shaft to withstand the impact of additional loads, resulting in overheating of the bearings. If this situation occurs, it is necessary to immediately shut down the machine to eliminate the fault, in order to avoid early bearing damage.

(2) Excessive, insufficient, or aging of lubricating oil in bearings is also the main cause of bearing overheating and damage. Therefore, it is necessary to add lubricating oil in a timely and quantitative manner according to the requirements of the user manual. Generally, lubrication occupies 60% -70% of the bearing space, and excessive or insufficient lubrication is not conducive to bearing lubrication and heat transfer. Bearings extend their service life.

(3) The tight fit between the bearing cover and the bearing, as well as the tight or loose fit between the bearing and the shaft, can cause the bearing to overheat. Once this problem occurs, there will be a friction sound and obvious oscillation during the operation of the equipment. Stop the machine and remove the bearings. Repair the friction area and reassemble as required.

3. Crusher screen blockage: Crusher screen blockage is one of the common faults in the use of pulverizers. There may be problems in the design of the screen plate, but it is mostly caused by improper use and operation.

(1) The feeding speed is too fast, the load increases, causing screen blockage. During the feeding process, pay attention to the large deflection angle of the Ammeter pointer at any time. If the current exceeds the rated current, it indicates that the motor is overloaded. If the motor is overloaded for a long time, it will burn out the motor. If this situation occurs, the feeding door should be immediately reduced or closed, or the feeding method can be changed by reducing the feeder to control the feeding amount. There are two types of feeders: manual and automatic. Users should choose the appropriate feeder based on their actual situation. Due to the high speed, high load, and strong fluctuation of load of the crusher. Therefore, the current of the crusher during operation is generally controlled at around 85% of the rated current.

(2) Insufficient negative pressure in the crushing chamber leads to poor discharge of the powder through the sieve plate or the air network pipeline, resulting in screen blockage of the crusher. There are many reasons for screen blockage caused by problems with the air network system, such as the design diameter of the discharge air duct being too large or too small, the number of air duct bends causing high resistance, the pulse not waiting to be blocked and not breathable, the jet pressure of the pulse nozzle being too low, the fan selection part being reasonable, the air network pipeline being too long, and the air network pipeline leaking, etc. The reasons should be eliminated one by one for rectification and adjustment, and daily maintenance work such as regular inspection, cleaning, or replacement of the pulse cloth bag should be carried out, Ensure the normal operation of the crusher. 

(3) Broken hammers, large wear, closed and broken mesh holes, and high moisture content of crushed materials can cause the crusher to block the screen. The broken and severely worn hammer blades should be regularly updated to maintain the good working condition of the crusher, and the sieve should be regularly checked. The moisture content of the crushed material should be less than 13%, which can improve production efficiency and ensure that the crusher does not block the sieve, enhancing the reliability of the crusher's operation.