Industry news

Slewing bearing maintenance methods and precautions


The slewing bearing is an indispensable part in large machinery. It can be installed in the machinery to allow the machinery to rotate left and right. At the same time, it can withstand various forces. Because the slewing bearing is very important, it needs careful maintenance. More than 96% of the slewing bearing failures are caused by lubrication problems, pollution, wear and incorrect operation, which seriously affect its service life and normal performance. Today, Yantai Zhiyuan will explain to you the maintenance methods and precautions during the use of the slewing bearing.


slewing bearing


a. How to use and maintain the slewing bearing


1. Before the slewing bearing is put into use, it should be filled with new grease according to different working conditions. The slewing bearing should be filled with grease regularly. According to different types of slewing bearings, the specific filling time of grease is as follows:


The ball type is filled with grease every 100 hours of operation; the roller type is filled with grease every 50 hours of operation.


If it is in special working environment, such as: tropical, high temperature, dusty, high temperature and continuous work, the grease filling cycle should be shortened, and it should be ensured that it should be filled once every 50 hours of work.


2. When the gear is working normally, it should be ensured that the detergent is applied once every 150 hours of work. When it is working vigorously, the detergent should be applied once every 75 hours of work. Note that the teeth must be wiped clean before applying the detergent. The machine must be filled with new grease before and after the machine has been stagnant for a long time. Each time the grease is added, the raceway must be filled until it overflows from the sealing device. When adding grease, the slewing bearing should be slowly transferred. Fill the raceway with grease evenly.


3. During use, the debris on the surface of the slewing bearing should be removed frequently, and the sealing strip of the slewing bearing should be checked for aging, cracking, damage or detachment. If one of these conditions occurs, the sealing strip should be replaced in time to prevent debris from entering the raceway In case of the loss of grease, the corresponding grease should be applied after replacement to avoid the rolling elements and raceways from being caught or corroded.


4. Because there are many comprehensive factors in the use process, the user can choose a more suitable grease according to the specific situation. For example, the raceway can use: No. 3, No. 4 graphite grease, industrial grease, No. 203 grease , No. 7002 high and low temperature bearing grease and No. 2 aluminum-based grease.


5. From the installation of the slewing bearing, after 100 hours of operation, the pre-tightening force of the bolts should be checked, and every 500 hours of operation after that, it must be maintained with sufficient strength and effort.


6. After the equipment has been working for 2000 hours, if a bolt is found to be loose to less than 80% of the specified torque, the bolt and the two adjacent bolts should be replaced with new ones; if 20% of the bolts are found to be loose to 80% of the specified torque Below, replace all bolts with new ones. After the accumulative work of the equipment reaches 14,000 hours, all bolts should be replaced with new ones (Chongcheng recommends: re-firm each firm part after the first two to four months of use, and then transition to an annual systematic inspection).


7. Pay close attention to the operation of the slewing bearing during use. If noise, impact, or sudden increase in power is found, it should be stopped immediately for inspection until all faults are eliminated. If necessary, it needs to be disassembled and inspected.


8. When the slewing bearing is in use, it is forbidden to directly wash the slewing bearing with water to prevent water from entering the raceway and cause rust; strictly prevent hard foreign objects from approaching or entering the meshing area, so as to avoid injury to the teeth or unnecessary trouble.



b. Precautions for maintenance of slewing bearing


1. When maintaining the slewing bearing, pay attention to its installation surface to be flat. Before assembling the slewing bearing, the bearing should be treated with stress relief. The maintenance of the slewing bearing and the slewing bearing can reduce the deformation of the slewing bearing. The contact surface of the bearing must be cleaned.


2. Pay attention to the change of noise and the change of the slewing resistance torque during the use of the slewing bearing and the slewing bearing. If there is any abnormality in the maintenance of the slewing bearing and the slewing bearing, it should be dismantled and inspected.


3. Note that the slewing bearing and slewing bearing tooth surface should be cleaned once every 10 days of work, and re-applied with grease, and the amount of grease used is determined according to different models.


4. Pay attention to the maintenance frequency of the slewing bearing. In fact, the maintenance is not to say that the more frequent the better, it is still necessary to carry out maintenance according to the situation. If the frequency is too high, it is not good for the bearing, so it must be Pay more attention.


Slewing bearing maintenance methods and precautions


The above is the "maintenance method and precautions during the use of the slewing bearing". If the slewing bearing has noise, impact and other faults after using it for a period of time, the operator should pay attention to observation and timely inspection to eliminate the fault. Only correct and reasonable maintenance of the slewing bearing can ensure its normal operation, give full play to its performance and prolong the service life of the slewing bearing.