How To Remove The Bearings Of The Vibrating Screen
13/04/2023Causes and prevention techniques of wear of double row deep groove ball bearings
13/04/2023
- Fixing of bearings
After determining the type and model of the bearing, the combined structure design of the rolling bearing must be carried out correctly to ensure the normal work of the bearing.
The combined structure design of bearings includes:
1) Shafting supporting end structure;
2) Fitting of bearings and related parts;
3) Lubrication and sealing of bearings;
4) Improve the stiffness of the bearing system.
- Fixed at both ends (unidirectional fixed at both ends)
Short shaft (span L<400mm) under ordinary working temperature, the fulcrum often adopts one-way fixed mode at both ends, and each bearing bears axial force in one direction respectively. As shown in the figure, in order to allow a small amount of thermal expansion when the shaft is working, the axial clearance of the bearing should be left at 0.25mm-0.4mm (the clearance is very small, it does not need to be drawn on the structure diagram), and the clearance amount is usually adjusted by gasket or adjustment screw.
Features: Limit the bidirectional movement of the shaft. It is suitable for shafts with little change in operating temperature.
Note: considering heat elongation, leave compensation gap c between bearing cover and outer end face, c=0.2~0.3mm.
- One end is fixed in both directions and one end is swimming
When the shaft is long or the working temperature is high, the thermal expansion and contraction of the shaft is large, so it is appropriate to adopt a fulcrum structure with one end fixed in both ways and one end swimming, as shown in the figure.
The fixed end is subjected to bidirectional axial force by a single bearing or bearing group, while the swimming end ensures free swimming when the shaft is extended. In order to avoid loosening, the inner ring of the swimming bearing should be fixed axially with the shaft (elastic retaining ring is often used). When the cylindrical roller bearing is used as the fulcrum, the outer ring of the bearing should be fixed axially with the frame, and the free expansion of the shaft can be guaranteed by the swimming between the roller and the ring.
Features: One fulcrum is fixed in both directions, and the other fulcrum moves in axial direction.
Deep groove ball bearing as a swimming fulcrum, bearing outer ring and end cover gap.
Cylindrical roller bearing as a swimming fulcrum, bearing outer ring should be fixed in both directions.
Suitable for: long axis with large temperature change.
Adjustment of bearing combination
- Adjustment of bearing clearance
Adjustment method: (1) adjust the thickness of the gasket between the bearing cover and the frame;
(2) Adjust the movement of bearing outer ring gland with screws.
- Preload bearings
Objective: To improve precision, stiffness and reduce vibration.
During installation, a certain axial force is maintained in the bearing according to the preload requirements of the bearing, so as to ensure a certain clearance.
- Adjustment of bearing combination position
Make the parts on the shaft (gear, pully, etc.) have accurate working position.
- Fit of rolling bearings
The matching of bearing inner ring hole and shaft adopts base hole system;
The coordination between the bearing outer ring and the bearing seat hole adopts the base shaft system.
- Assembly and disassembly of rolling bearings
The design life of the rolling bearing is usually different from that of the whole machine, so it needs to be replaced many times in the process of use. When the parts with assembly relationship with the bearing are damaged, the bearing also needs to be disassembled. When the bearing is removed, the disassembly force should not be transmitted through the rolling body to prevent plastic deformation of the rolling body.
