Key Points For Installation And Maintenance Of Turntable Bearings

The slewing bearing is a large bearing with a special structure that can bear comprehensive loads such as large axial loads, radial loads, and overturning moments at the same time, and integrates multiple functions such as support, rotation, transmission, and fixation. Therefore, when installing the slewing bearing, we must do a good job of checking the correlation, or the matters that need to be paid attention to during installation. For this kind of large bearing, we must do a good job of maintenance and storage, so as to avoid the following damage to the slewing bearing. resulting in failure to use normally.

       1. Installation of turntable bearing

       Before the slewing bearing is installed, the installation surface of the main engine should be inspected first. It is required that the support should have sufficient strength, the connection surface should be machined, and the surface should be smooth without sundries and burrs. For those that cannot be machined to achieve the required flatness, special plastics with high injection strength can be used as fillers to ensure the accuracy of the installation plane and to reduce vibration. The ring of the slewing bearing has a hardened soft zone, which is marked with “S” on the end face of the ring. When installing, the soft zone should be placed in the non-load zone or non-normal load zone (the plug hole is always located in the soft zone. belt).

       When installing the slewing bearing, radial positioning should be carried out first, the mounting bolts should be tightened crosswise, and the rotation of the bearing should be checked. When tightening the bolts, there should be sufficient pre-tightening force, and the pre-tightening force should be 70% of the yield limit of the bolt material. Mounting bolts should be equipped with quenched and tempered flat washers and spring washers are strictly prohibited.

       2. Maintenance of the slewing bearing:

      After the slewing bearing is installed and put into operation for 100 hours of continuous operation, it should be fully checked whether the pre-tightening torque of the mounting bolts meets the requirements, and the above inspection should be repeated every 500 hours of continuous operation. After the slewing bearing is installed, it should be filled with an appropriate amount of grease, and the bearing should be slewed while filling to make the grease evenly distributed. After working for a period of time, the slewing bearing will inevitably lose part of the grease, so the slewing bearing in normal operation should be replenished with grease every 50 to 100 hours.

       3. Transportation and storage of slewing bearings:

      During transportation, the bearings should be placed horizontally on the vehicle, and measures should be taken to prevent sliding and vibration, and auxiliary supports should be added if necessary.