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Briefly on how to correctly install the slewing bearing soft belt

2020-12-25

The slewing ring soft belt refers to the area that has not been hot-processed in the whole machine. The general process of the equipment rolled in the slewing ring is: casting → 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 advance 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 of the slewing ring is relatively large, flame surface quenching is generally 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. The heating flame spray gun and the water gun equipment together, make a circular motion along the circle of the workpiece together. When the movement is close to 360 degrees, it immediately heats and sprays water intermittently. That is, the heating and water spraying round areas do not stack up. If there is a stacking phenomenon in the circle area where heating and spraying water occur (the angle of the heat treatment on the circle is greater than 360 degrees), the workpiece will crack. 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 circumstances, put the steel letter "S" on the position where the soft band exists on the workpiece to indicate the specific soft band position. Imported or domestically produced regular products generally have this very important symbol.

Due to the certainty of the soft belt on the slewing bearing equipment, it is required that the user who uses and selects the slewing bearing equipment should have a reasonable orientation of the soft belt of the equipment to advance the service life of the bearing. The general principle is to try to make the soft belt equipment in the load change process in the direction where the load of the soft belt is small. Generally, the upper loop soft belt equipment of general slewing equipment is in the direction perpendicular to the projection line of the pitch rotation surface, 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 general mechanical design, the soft belt will not have the maximum force on the support roller of the slewing bearing equipment in this position. The equipment orientation of the lower ring soft belt of the slewing equipment should be recognized according to the center of gravity of the equipment and the scale of the slewing angle. If the rotation angle is 100 degrees left and right, and the maximum center of gravity of the upper part of the rotation is in the front, it is recommended to place the lower loop soft belt equipment at the back, that is, 180 degrees. If the orientation of the center of gravity of the above part of the rotation is flat in the front and rear orientation, the angle and orientation of the lower loop soft belt of the device can be arbitrary.


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