How to correctly install the tower crane slewing bearing

Tower crane slewing bearing is a kind of large special structure bearing that can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time. In addition, the slewing bearing itself has the characteristics of compact structure, convenient guide rotation, easy installation and easy maintenance. How to correctly install the tower crane slewing bearing, the slewing bearing manufacturer reminds you to start from the following aspects:

First, carry out anti-rust treatment on the product

Considering the harsh working conditions of tower cranes, good anti-rust treatment can maintain the performance of the slewing bearing. Before the products leave the factory, the company has taken special paint or oxidation treatment measures on the outer surface of the products. The equipment has a long durability. According to the special requirements of customers, chrome plating (TDC) or nickel plating can also be used.

Second, the installation of tower crane slewing bearing

During installation, after the slewing bearing is hoisted in place, use a feeler gauge to check the flatness of the fitting plane, and the specific allowable flatness value shall be implemented in accordance with relevant regulations. If the clearance is too large, it should be re-machined. If the required flatness cannot be achieved by machining, plastic filling or partial gaskets can be used to ensure the accuracy of the installation plane and reduce vibration. In order to avoid the deformation of the slewing plate bearing after the bolt is tightened, which will affect the normal operation of the slewing plate bearing.

After locating the slewing bearing radially, tighten the mounting bolts crosswise in a star shape, and check the rotation of the slewing bearing. In order to ensure the smooth transmission of the slewing bearing, the gear backlash should be checked and adjusted before the mounting bolts are fully tightened. When tightening the bolt, there should be sufficient pre-tightening force, and its 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.

Third, the maintenance of the slewing bearing

1. The raceway of the slewing bearing is coated with a small amount of No. 2 or No. 3 lithium-based grease when it leaves the factory. When it is officially put into use, the user should refill it with new grease according to different working conditions.

2. During the use of the slewing bearing, grease should be added regularly. Generally, the steel ball slewing bearing is refueled once every 100 hours of operation, and the roller slewing bearing is refueled every 50 hours, because the tower crane slewing bearing works at high temperature and humidity. , dust, large temperature changes and continuous working environment, all to shorten the lubrication cycle.

If the tower crane is not used for a long time, it should be filled with grease when it is used for the first time. The raceway must be filled with grease every time it is lubricated until the grease traces seep out from the edge of the sealing ring. Evenly fill with grease. After the filling is completed, the installation can be carried out.

3. For slewing bearings with internal teeth or external teeth, debris should be removed frequently to prevent hard foreign objects from approaching or entering the tooth meshing area. And regularly apply the corresponding grease.

4. During the use process, you should always pay attention to the operation of the slewing bearing. If you find abnormal conditions such as noise, impact, and sudden increase in power, you should stop the machine immediately to check, remove the fault, and disassemble if necessary.

The above is about the whole process of tower crane slewing bearing installation and related precautions. It is recommended that the operator must strictly follow the installation operation rules during installation to avoid potential safety hazards during the installation process.