Publish Time: 2022-11-01 Origin: Site
As the slewing ring of the excavator, the probability of serious failure is not high, but once a failure occurs, it will cause a very large loss of work stoppage, maintenance and replacement! For example, the turntable bearing is broken, etc. Therefore, we should pay more attention when using turntable bearing.
What are the reasons for the early failure of the turntable bearing due to broken teeth?
What are the characteristics of the materials used in turntable bearings?
What is the basic structure of turntable bearing?
From the analysis of the data we have, most of the 20-22-ton excavators at home and abroad use turntable bearing gears with a modulus of 10mm (or diameter pitch = 2.5), heat treatment and accuracy levels are basically the same, excavators generally use standard Tooth height and standard pressure angle. The circumferential allowable force P of the turntable bearing gear can be calculated as follows:
P=Kz*m*b/78 (tons) where Kz=(z/150)^(±0.09) the external tooth is +; the internal tooth is -z - tooth number m - modulus mmb - tooth width mm Width b=80; number of teeth z=90～110; and for internal meshing, the allowable circumferential force of the gear is:
p=(90～110/150)^(-0.09)*10*80/78=10.74～10.55(tons)
It can be seen that the circumferential allowable force of the gear can meet the load requirements of the turntable bearing gear of the ton-level excavator, but the early tooth breakage rate of the turntable bearing in some models of this level is as high as 2%, and most other models have no gear. This phenomenon occurs.
In general, the rolling elements of the slewing ring are made of carbon-chromium bearing steel which is hardened as a whole. The turntable bearing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel, but sometimes in order to meet the needs of the host in some special applications, other grades of surface can also be selected according to the specific conditions provided by the user. Hardened steel, such as 42CrMo, 5CrMnMo, etc.
turntable bearing usually consists of worm, turntable bearing, housing, motor and other components. Because the core component adopts turntable bearing, it can bear axial force, radial force and tipping moment at the same time. There are many forms, but the structure and composition are basically the same.
From left to right are (upper part):
1. Outer ring (with or without teeth) 2. Sealing belt 3. Rolling body (ball or roller) 4. Oil filler
From left and right are (lower part): 1. Plug 2. Plug pin 3. Inner ring (with or without teeth) 4. Spacer block or cage 5. Mounting hole (wire hole or smooth hole).
The turntable bearing has been widely used in the large-scale production process. It can be welcomed by large-scale producers for its high production efficiency and low energy consumption. LYXQL Slewing Bearing Co., Ltd. founded. has worked for several years to meet the need of customers from industrial production, and large-scale commercial production.
LYXQL Slewing Bearing Co., Ltd. founded in 2003, is the leader manufacturer of large size slewing bearings in China. As one of the national key high-tech enterprises, LYXQL became the GEM listing company successfully on July 13, 2020 (stock code 300850).