Installation ,Use and Maintenance Of Slewing Bearings

Abstract:Slewing bearing is a rotating rolling element bearing that can withstand axial force, radial force and tilting force at the same time. In order to ensure the smooth progress of construction activities, it is necessary to master the correct installation method of the slewing bearing. If the slewing bearing is installed incorrectly or incorrectly, it will lead to the slewing bearing can not work properly, such as rotating inflexible, noise and other problems. The following is to introduce the slewing bearing installation method and slewing bearing use and maintenance knowledge.

First, slewing bearing installation method

1, the installation of slewing bearing before unpacking and against the certificate of conformity and slewing bearing on the labeling information to confirm the consistency with the selected model; carefully check the appearance of the situation, see slewing bearing in the transportation process whether there is a bump or large damage, manual rotation slewing bearing, check the rotation of slewing bearing is flexible, check whether the installation base is flat, the installation base should be machined surface, the installation surface should be flat and burr-free.

2, when installing the slewing bearing, put the slewing bearing on the platform of the installation foundation horizontally, check the position of the soft belt (general marking S), put the soft belt and the blocking position in the non-load area or light load area. With a ruler to see the slewing bearing plane and the installation of the foundation plane whether there is a gap, if there is a large gap to prove that the installation of the foundation is not good flatness, if the conditions allow should be reworked to install the foundation, if the conditions do not allow, can be used in the gap at the method of eliminating the gap with a pad of copper skin, which prevents the bolt twisting after the slewing bearing was deformed, affecting the slewing performance and life of the slewing bearing. Installation bolts should be symmetrical and continuous according to the 180 ° direction, after checking to ensure that all the bolts on the circumference of the required torque tightening, bolts are not recommended to use non-standard, can not be used with the old bolts, can not be used to open the elastic washers.

3, if the installation of the teeth of the slewing bearing need to adjust the tooth side clearance, the correct tooth side clearance is very important to find the tooth high point (top of the tooth green paint or blue paint) position, can be used to measure the adjustment of the slewing bearing and pinion tooth side clearance, the general value of the side clearance adjusted to 0.03-0.04) times the modulus, adjusted the tooth side clearance, after manually rotating the slewing bearing at least one turn to verify that the teeth mesh without the phenomenon of hysteresis, and then mounting bolts in accordance with the Then install the bolts according to the 180 ° direction symmetrical continuous tightening, after checking to ensure that all the bolts on the circumference of the required torque tightening.

4、Because of more comprehensive factors in the use process, the user can choose the more suitable grease according to the specific situation. Slewing bearing since the installation, after the first operation 100 hours, should check the bolt pre-tensioning force, and then every 500 hours of operation check, must maintain sufficient pre-tensioning force.

5、After 2,000 hours of cumulative work, if a bolt is found to be loosened 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 loosened to less than 80% of the specified torque, then all the bolts should be replaced with new ones, and all the bolts should be replaced with new ones after the cumulative work of the equipment reaches 14,000 hours. (Suggestion: in the first two to four months before use, all the bolts should be replaced with new ones. (Recommendation: Re-strengthen each solid part after the first two to four months of use, and then transition to annual systematic inspection).

6, in use to pay close attention to the operation of the slewing bearing, such as noise, impact, power suddenly increased, should immediately stop the machine to check, until all the faults are eliminated, if necessary, need to disassemble and check.

7, slewing bearing in use, prohibit water directly flush slewing bearing, avoid water into the raceway caused by rust, strictly prevent the harder foreign objects close to or into the engagement area, so as not to cause tooth injury or unnecessary trouble.

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