Rolling bearing is a kind of precise mechanical component that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss. The rolling bearing of the busbar processing machine generally consists of four parts: the inner ring, the outer ring, the rolling element and the cage. The inner ring is matched with the shaft and rotates with the shaft; the outer ring acts to cooperate with the bearing seat to support the rolling; The body is distributed between the inner ring and the outer ring by means of the cage uniformly. The shape and quantity of the body directly affect the performance and life of the rolling bearing; the cage can evenly distribute the rolling elements and prevent the rolling elements from falling off. Guide the rolling element to rotate for lubrication.
Function
Supporting the rotating shaft and the parts on the shaft, and maintaining the normal working position and rotation precision of the shaft, the rolling bearing is easy to use and maintain, reliable in operation, good in starting performance, and high in carrying capacity at medium speed. Compared with the sliding bearing, the radial dimension of the rolling bearing is large, the damping capacity is poor, the life at low speed is low, and the sound is loud.
2. Structure
The structure of the rolling bearing is composed of parts
1. The outer ring is installed in the hole of the bearing housing and generally does not rotate.
2. Inner ring - mounted on the journal, rotating with the shaft
3. Rolling elements - the core components of rolling bearings
4. Cage - evenly separate the rolling elements to avoid friction
Lubricant is also considered to be the fifth largest part of rolling bearing. It mainly functions as lubrication, cooling and cleaning.
Rolling bearing characteristics
Specialization
Bearing special equipment is used in the processing of bearing parts. For example, steel ball processing uses grinding machines, grinding machines and other equipment. The specialization features are also reflected in the production of bearing parts, such as steel ball companies specializing in the production of steel balls, and miniature bearing factories specializing in the production of miniature bearings.
2. Advanced
Due to the high volume requirements of bearing production, it is possible to use advanced machine tools, tooling and processes. Such as CNC machine tools, three-jaw floating chucks and protective atmosphere heat treatment.
3. Automation
The specialization of bearing production provides conditions for its production automation. A large number of fully automatic, semi-automatic dedicated and non-dedicated machine tools are used in production, and the production automatic line is gradually promoted and applied. Such as heat treatment automatic line and assembly automatic line.
Basic Features
benefit
(1). Energy saving is remarkable. Due to the characteristics of the rolling bearing itself, the frictional force is much smaller than that of the sliding bearing, which can reduce the power consumption consumed by the frictional resistance, so the energy saving effect is remarkable. From the theoretical analysis and production practice, the general small ball mill with main bearing adopts rolling bearing can save 30%~35%, the medium ball mill can save 15%~20%, and the large ball mill can save 10%~20%. Since the ball mill itself is a large energy consumer in production, this will mean a significant savings and a considerable cost.
(2). Easy maintenance and reliable quality. The use of rolling bearings can eliminate a series of complicated and technically demanding maintenance processes such as smelting, casting and scraping of babbitt alloy materials, as well as oil supply and water supply cooling systems, so the maintenance amount is greatly reduced. Moreover, since the rolling bearing is manufactured by a professional manufacturer, the quality is often guaranteed. It also brings convenience to the manufacturer of the ball mill.
advantage
1The frictional resistance is small, the power consumption is small, the mechanical efficiency is high, and it is easy to start.
2, size standardization, interchangeability, easy to install and disassemble, easy to maintain.
3. Compact structure, light weight and smaller axial size.
4. High precision, high speed, low wear and long service life.
5. Some bearings have self-aligning performance.
6, suitable for mass production, stable and reliable quality, high production efficiency.
7. The transmission friction torque is much lower than that of the fluid dynamic pressure bearing, so the friction temperature rise and power consumption are low;
8. The starting friction torque is only slightly higher than the rotating friction torque;
9. The bearing deformation is less sensitive to load changes than the fluid dynamic pressure bearing;
10. Only a small amount of lubricant is needed to operate normally, and the lubricant can be supplied for a long time during operation;
11. The axial dimension is smaller than the traditional fluid dynamic pressure bearing;
12. It can bear radial and thrust combined loads at the same time;
13, in a large load-speed range, unique design can obtain excellent performance;
14. Bearing performance is relatively insensitive to fluctuations in load, speed and operating speed.
Disadvantage
1, the noise is large.
2. The structure of the bearing housing is more complicated.
3. The cost is higher.
4. Even if the bearings are well lubricated, the installation is correct, the dustproof and moistureproof are tight, and the operation is normal, they will eventually fail due to the fatigue of the rolling contact surface.
3. Performance
Self-aligning performance
The ability of the bearing to function properly when the shaft centerline is tilted relative to the centerline of the housing bore. Double row radial spherical ball bearings and double row radial spherical roller bearings have good self-aligning properties. Roller bearings and needle bearings do not allow relative tilting of the inner and outer ring axes. All kinds of rolling bearings allow different inclination angles, such as single-row radial ball bearings are 8' ~ 16', double-row radial spherical ball bearings are 2 ° ~ 3 °, tapered roller bearings ≤ 2'.
Limit Speed The maximum speed allowed for a bearing under certain load and lubrication conditions. The speed limit is related to bearing type, size, accuracy, clearance, cage, load and cooling conditions. The bearing operating speed should be lower than the limit speed. The use of high-precision bearings, improved cage structure and materials, oil mist lubrication, improved cooling conditions, etc., can increase the limit speed.
Original article of this article, if you need to reprint, please specify Jinan Jingpeng bus processing machine manufacturers
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