Main Factors Affecting Bearing Temperature Rise of Feed Crusher
As one of the commonly used feed processing machines, the feed grinder often suffers from overheating of the bearing and excessive temperature rise of the bearing during the user's use, which to some extent reflects the assembly quality of the whole feed grinder and the scientific rationality of the user's use of the machine. If the bearing temperature rises too high, the bearing wear will be accelerated, leading to the damage of the main shaft, which seriously affects the reliability and safety of the whole machine. The main factors affecting the bearing temperature rise of feed grinder are: bearing quality, spindle speed, assembly quality, lubrication and use.
1 Bearing quality
Rolling bearings are generally used in feed mills, and the quality of bearing materials has a very important impact on bearing temperature rise. The bearings made of inferior materials are assembled on the feed grinder. When the machine is running, the inner ring of the bearing is deformed due to force, resulting in deformation of the support or clearance change, which will make the bearing rotate inflexibly and the bearing temperature rise is too high. Therefore, play to ensure that the bearings of the feed grinder purchased are qualified products, and it is better to choose the feed grinder produced by regular manufacturers.
2 Spindle speed
The spindle speed of the feed grinder is more than 4500r/min, and the spindle transmits the power of the motor to the hammer or claw on the rotor disk. The working principle of the feed grinder is to smash the feed through the high-speed hammer or claw. As a component carrying the high-speed operation of the main shaft, the faster the speed of the bearing is, the higher the temperature rise of the bearing will be. Therefore, when using the feed grinder, the supporting power should be selected according to the instructions.
3 Assembly quality
The assembly quality is an important factor affecting the temperature rise of the bearing of the feed grinder. Too tight fit between bearing cover and shaft, or too tight or loose fit between bearing and main shaft will cause bearing overheating. During the operation of the equipment, once the bearing makes friction sound and obvious swing, stop the machine to remove the bearing, trim the friction part, and then reassemble as required. The tightness of the drive belt and the balance of the rotor during assembly will affect the bearing temperature rise. The two bearings of the rotor are not concentric. That is, the coaxiality of the two journals where the bearing is installed on the rotor shaft is not enough, and the V-shaped groove of the rotor pulley is not aligned with the V-shaped groove of the power (motor) pulley, which will make the shaft bear the impact of unstable load, thus causing overheating of the bearing. Therefore, it is necessary to carry out the rotor balance test before assembly. Before using the feed grinder, check whether the fastening screws are loose and adjust the tightness of the conveyor belt. In particular, the fastening of high-speed moving parts such as tooth claws or hammers must be safe and reliable. If abnormal noise occurs during startup, the machine should be stopped immediately to eliminate the fault, so as to avoid premature damage of bearings and spindles and affect the service life of the machine.
4 Lubrication
Too much, too little or aging of lubricating grease in the bearing of feed grinder is easy to cause excessive temperature rise of the bearing. If there is too much grease in the bearing, eddy currents will occur. The phenomenon of increased friction and poor heat dissipation of the bearing causes a sharp rise in the temperature of the bearing; Too little lubricating grease or the use of cheap and low-quality lubricating grease is easy to cause poor bearing lubrication effect; If impurities enter the bearing and are not cleaned up in time, the friction will increase and the bearing temperature will rise too high. Therefore, before using the crusher every time, check whether the amount of lubricating grease in the bearing is appropriate, whether it is aging and deteriorated, and add or replace it in a timely manner. After the crusher works for a period of time, disassemble and clean the bearing.
5 Usage
The main reasons for the excessive temperature rise of bearings caused by users are: too much feed; The feeding amount is uneven, resulting in unstable load; Feed with high humidity; Start the machine and carry out operation immediately. Therefore, feed should not be too much, too wet, and the feeding amount should be uniform. The feed grinder is generally used with rolling bearings. The initial temperature of the bearing is relatively high when it starts. After a period of operation, the bearing temperature gradually decreases and reaches a stable value. This is because the load of the machine is unstable when the rolling bearing starts to operate. Therefore, the feed grinder must be turned on for idling for a few minutes before it can be crushed. After feeding, let the pulverizer continue to run for several minutes, and then stop the machine after all materials in the crushing chamber are crushed and discharged.
The above contents summarized that the bearing quality, spindle speed, assembly quality, lubrication and service conditions are the main factors affecting the bearing temperature rise of the feed grinder, providing a reference for users to judge the abnormal bearing temperature rise. The user shall pay attention to the change of bearing temperature rise during the use of the feed crusher, and correctly judge the cause and timely handle in case of any abnormality.
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