Analysis on the installation method of slewing bearing soft belt

2019-08-30

The slewing ring soft belt refers to the area that has not been hot processed in the entire machine. The general process of the equipment rolled in the slewing ring is: forging → rough machining → quenching and tempering treatment → finishing → raceway surface flame surface quenching → raceway surface Grinding and other processes. In the meantime, the equipment of soft belt is more difficult, this article will introduce the skills of equipment soft belt in detail.

The orientation requirements of the flexible belt equipment will essentially be to improve the life of the bearing. From the perspective of the user and the manufacturer, it is still reasonable that the orientation of the upper and lower ring soft belts of the equipment slewing ring is better. Therefore, the position of the soft belt of the slewing bearing should be accurately marked, and the position of the soft belt of the slewing bearing should be reasonably equipped according to the needs.

Because the diameter of the raceway circle of the slewing ring is relatively large, flame surface quenching is usually used. The method is to use acetylene to heat the surface of the workpiece that needs to be hardened and then add water to cool it. This process is completed one after another. Heat the flame spray gun and the water gun equipment together, while making a circular motion along the circle of the workpiece. When the movement reaches nearly 360 degrees, the heating and spraying will be stopped immediately. That is, the heating and spraying circular area does not stack up. If there is a stacking phenomenon in the circle area where heating and water spray occur (the viewpoint of the heat treatment on the circle is greater than 360 degrees), cracks will occur in the workpiece. The width of the unheated area along the tangential direction is generally 15 mm. This 15 mm area is called a soft belt in the slewing ring. It often becomes SOFTZONE in English. Under normal conditions, put the steel letter "S" on the position where the soft band exists on the workpiece to illustrate the detailed soft band position. Imported or domestically produced regular products usually have this very important symbol.

Because of the inevitability of soft belts on slewing bearing equipment, users who use and select slewing bearing equipment are required to have a reasonable orientation of the soft belt of the equipment to improve the service life of the bearing. The general principle is to try to put the soft belt equipment in the direction where the load is small during the load change. Usually the upper loop soft belt of the slewing equipment is in the direction perpendicular to the projection line of the pitch and rotation plane, such as the upper loop soft belt of the ship loader or stacker-reclaimer slewing equipment. , That is, standing on the center of rotation facing the left or right side of the cantilever at 90 degrees.

In the usual mechanical design, the soft belt does not have the maximum force of the support roller of the slewing bearing equipment in this position. The equipment orientation of the lower loop soft belt of the slewing equipment should be confirmed according to the gravity center of the equipment and the scope of the slewing viewpoint. If the turning point of view is 100 degrees left and right, and the maximum center of gravity of the upper part of the turning is forward, it is recommended to place the lower ring soft belt equipment at the rear, that is, 180 degrees. If the change of the center of gravity of the upper part of the rotation is the same in the front and rear directions, the viewpoint of the lower ring soft belt of the equipment can be arbitrarily positioned.