Publish Time: 2020-11-05 Origin: Site
Slewing ring bearing is now used more of a kind of accessories, in the process of daily use, how much will be heat, but this kind of situation if not timely solve, is larger for bearing damage, to introduce today is about what causes slewing ring bearing of heat, and how should be handled correctly.
The following knowledge points are listed below:
The structure of Slewing rings
Slewing ring bearing lubrication and maintenance method
Causes and solutions of heat caused by slewing ring bearing structure
Slewing ring bearing rolls are usually separated from each other by individual nylon isolation blocks. This structure can keep the movement smooth, low price is widely used. Special applications need to use special ball or roller isolation block, such as copper, aluminum and other high temperature isolation fast. Slewing ring bearing, which is usually mounted on a horizontal shaft or a continuous rotating generator and is used in situations with high requirements for positioning and reliability, can be used to make the rolling body in the correct circular position with higher reliability.
Reason 1: the bearing of slewing ring bearing is too large, so the bearing will be tight.
Reason 2: aluminum three-layer ring sealing ring friction causes heat solution: in the installation of sealing hole and ring should be coated with grease to reduce the friction resistance. Solution: slewing ring bearing will remove excess grease through the sealing hole, and oil lubrication will lower the oil level just below the bearing box.
Reason 3: the inner ring and sealing ring friction heating solution: at this time to stop and check the clamping ring screws, to ensure that the inner ring on the shaft firmly attached, to ensure that the free bearing is installed correctly, roller and outer ring center line alignment.
In addition to the causes of slewing ring bearing structure, there are other causes causing heat, as follows:
Reason 4: improper type of grease or lubricating oil leads to lubricant failure solution: re-select the appropriate type of lubricating oil.
Reason 5: low oil level, insufficient grease solution: the oil level outside the shaft diameter should be just below the cage, add the appropriate grease.
Of course, there may be many reasons for the overheating of slewing ring bearing. In order to ensure the normal use of slewing ring bearing, we hope that when you encounter the overheating of slewing ring bearing, you can stop the machine to check in time, find out the reasons and deal with them, so as to prevent the shortening of the service life of slewing ring bearing.
(1) Slewing ring bearing was coated with a small amount of no. 2 extremely pressure lithium grease (GB/ t7324-1994) in the track when it was shipped out of the factory. When it is in use, it shall be filled with new grease according to different working conditions.
(2) Slewing ring bearing raceway shall be regularly filled with grease. General ball support every 100 hours running refueling, roller support every 50 hours refueling, special working environment, such as the tropics, high humidity, dust, temperature difference and continuous work, should shorten the lubrication cycle. New grease must be added before and after the machine stops running for a long time. During each lubrication, the raceway must be filled with grease until it seeps out from the sealing belt. When lubricating grease is injected, the slewing ring bearing should be slowly turned to evenly fill the grease.
(3) Slewing ring bearing surface should be removed frequently and coated with the corresponding grease.
(4) Due to various working factors, users can also choose the appropriate slewing ring bearing grease according to specific requirements.
(5) Slewing ring bearing shall check the preload of bolts after the first 100 hours of operation, and shall check the bearing every 500 hours after operation to maintain sufficient preload.
(6) Slewing ring bearing shall pay attention to the operation of slewing ring bearing. If noise, impact and power increase suddenly are found, it shall stop immediately for inspection and troubleshooting.
(7) Direct washing of slewing ring bearing with water is prohibited in use to prevent water from entering the raceway, and hard foreign bodies are strictly prevented from approaching or entering the tooth meshing area.
(8) Check the sound condition of the seal of slewing ring bearing frequently. If the seal bag is found to be damaged, it should be replaced in time; if it is found to fall off, it should be reset in time.
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