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Apr 22 2023
How to Effectively Prevent Excavator Swing Bearing Failure?
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Single row ball slewing bearing is composed of two seat rings, with compact structure, light weight, and four-point contact between steel balls and circular arc raceways, which can withstand axial force, radial force, and overturning moment at the same time. It is often used in engineering machinery equipment such as rotary conveyor, welding operation machine, small and medium-sized crane, and excavator. So what are its characteristics?
The size of slewing ring is usually large, with a diameter usually ranging from 0.4 to 10 meters, and some can reach 40 meters.
Slewing ring generally needs to bear several loads, not only axial force and radial force, but also large overturning moment. Therefore, the arrangement of ordinary rolling bearings is often used in the slewing ring.
The operating speed of the slewing ring is very low, usually below 10 revolutions per minute. In addition, in most cases, the slewing ring does not rotate continuously, but only rotates back and forth within a fixed angle, which is equivalent to the so-called "oscillating bearing".
In terms of manufacturing process, material, and heat treatment, slewing ring is very different from rolling bearing.
Usually, the slewing ring is equipped with a rotating drive gear and a sealing device for dust prevention.
The size of the slewing ring is very large. Unlike ordinary bearings, it is not fitted on the main shaft and installed in the bearing box, but is fastened to the upper and lower supports by bolts.
Single row ball slewing bearing is divided into three series: 1 series, HS series, and Q series. The basic code of the structure consists of three parts. The first part is the structure type and transmission type code, the middle part is the rolling body diameter (the maximum rolling body diameter of two rows) and the diameter of the rolling center circle behind (for single row ball slewing bearing with more than two rows of rolling bodies, the maximum rolling center circle diameter).
Structural model code: 01 single-row ball slewing bearing, 02 double-row ball bearing, 11 cross cylindrical roller bearing, and 13 three-row cylindrical roller bearing.
Transmission mode code: 0 no gear, 1 spur gear cylindrical gear small external gear component, 2 spur gear cylindrical gear large external gear component.
Open cylindrical gear internal gear small module, 4 helical cylindrical gear internal gear large module, 3 basic code writing rules basic code layout.
