Shaft Collars
The Shaft Collars is a cylindrical mechanical part that’s placed on the China Vacuum Pumps rotating shaft and can be an integral area of the sliding bearing.
In general, the Shaft Collars and the bearing casing have an interference in shape and a clearance fit with the shaft.
1, concept
A sleeve made of a full cylindrical protective shaft is named a Shaft Collar.
The bearing shell is equivalent to the external ring of the sliding bearing, the sleeve is integral and the contrary shaft is moving, while the bearing shell is segmented and the contrary shaft is rotating.
In the LEGOMindstorms series and BioTransRoSys group of robot components, the sleeves are specifically known as the silver-gray LEGO standard shaft holders, which are split into full sleeves and 1/2 sleeves.
The primary materials of all kinds of Shaft Collarss on the main hydropower generating units are ZQAl9-4, ZQSn10-1 and ZQSn6-6-3.
2, the difference
A Shaft Collars is a sleeve on a propeller shaft or a yoke shaft. Bearings (referred to as “shafts” in Japan) are components that fix and reduce the coefficient of friction of the strain during mechanical transmission.
The similarity between the Shaft Collars and the bearing is that both bear the strain of the shaft.
The difference between the two is that the sleeve is of integral structure, and the relative movement between your shaft and the sleeve is when rotating; and the bearing is normally split, and the rotation is the relative motion of the inner and outer bands of the bearing itself. However in essence, the Shaft Collars is truly a kind of sliding bearing.
3, common causes of damage
During the long-term operation of the Shaft Collars, the top of journal is put through the pressing power of the growth sleeve and the composite mechanical force, that may cause its long term deformation, and the diameter may be reduced by 0.1mm~0.3mm. Because of this, the mechanical expansion and the strength of the force aren’t up to the mandatory tightening drive, and a matching gap occurs between the sleeve and the main shaft, causing wear of the sleeve.
4, the most recent repair method
Due to the large worth of components, the original repair methods are relatively expensive. With the development of advanced systems such as polymer composite materials abroad, some repair strategies with quick restoration and low cost are favored. This method has also been presented in China, and the older Fushun Blue 2211F materials. The material gets the extensive mechanical properties, superb adhesion and temperatures and corrosion resistance which can’t be compared with the traditional method. The utmost compressive strength 
can reach 1200kg/cm2, and the adhesion (overlap shear tensile test) is usually 225kg on the smooth steel surface area. /cm2. Therefore, it can be utilized for the restoration of wear of huge Shaft Collars parts. Furthermore, the equipment doesn’t need to end up being disassembled in a large scale, which saves a whole lot of manpower and materials resources for the business.