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FITyou industry and service - Health and medical machine

(admin)

2018-12-10 10:36
Rolling bearing is a kind of precise mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing the friction loss. Rolling bearings are generally composed of inner ring, outer ring, rolling element and cage. The function of inner ring is to cooperate with the shaft and rotate with the shaft; the function of outer ring is to cooperate with the bearing seat and play a supporting role; the rolling element is to distribute the rolling element evenly between inner ring and outer ring by means of cage, and its shape, size and number Quantity directly affects the service performance and life of rolling bearings; cage can make the rolling body evenly distributed and guide the rolling body to rotate to play a lubricating role.


Effect

Supporting the rotating shaft and its parts, and maintaining the normal working position and rotating accuracy of the shaft, rolling bearings are easy to use and maintain, reliable to work, good starting performance, and high bearing capacity at medium speed. Compared with sliding bearings, rolling bearings have larger radial dimension, poor vibration reduction ability, low service life at high speed and larger sound.

Rolling bearing characteristics
 
1. specialization
 
Bearing parts processing, a large number of special bearing equipment. For example, ball grinding machine, grinding machine and other equipment are used in steel ball processing. Specialized features are also reflected in the production of bearing parts, such as steel ball companies specializing in the production of steel balls, micro bearing factories specializing in the production of micro bearings, etc.
 
2. advanced nature
 
Because of the large-scale requirements of bearing production, it is possible to use advanced machine tools, tooling and technology. Such as CNC machine tools, three-jaw floating chuck and protective atmosphere heat treatment.
 
3. automation
 
The specialization of bearing production provides conditions for its production automation. Automatic, semi-automatic special and non-special machine tools are widely used in production, and production automation lines are gradually popularized and applied. Such as heat treatment automatic line and assembly automatic line.
 
Basic characteristics
 
benefit
 
(1) energy conservation is remarkable. Because of the characteristics of rolling bearings, the friction force of rolling bearings is far less than that of sliding bearings, which can reduce the power consumption of friction resistance, so the energy-saving effect is remarkable. In theory analysis and production practice, the power saving of the general small ball mill with rolling bearings is 30%~35%, that of the medium ball mill is 15%~20%, and that of the large ball mill is 10%~20%. Because the ball mill itself is a big energy consumer in production, it will mean a considerable savings and considerable costs.
 
(2) Easy maintenance and reliable quality. Rolling bearings can eliminate a series of complex maintenance processes such as smelting, casting and scraping of pasteurized alloy materials, as well as oil supply, water supply and cooling systems, so the amount of maintenance is greatly reduced. And because rolling bearings are manufactured by professional manufacturers, the quality is often guaranteed. It also brings convenience to ball mill manufacturers.



Advantage
 
1. Small friction resistance, low power consumption, high mechanical efficiency, easy to start;
 
2. Size standardization, interchangeability, easy installation and disassembly, easy maintenance;
 
3. Compact structure, light weight and smaller axial dimension.
 
4. High precision, large load, small wear and tear, long service life;
 
5. Some bearings have the performance of automatic alignment.
 
6. It is suitable for mass production with stable and reliable quality and high production efficiency.
 
7. Driving friction moment is much lower than hydrodynamic bearing, so friction temperature rise and power consumption are lower.
 
8. The starting friction moment is only slightly higher than the rotating friction moment.
 
9. The sensitivity of bearing deformation to load variation is less than that of hydrodynamic bearing.
 
10. Only a small amount of lubricant is needed to run normally and provide lubricant for a long time.
 
11. Axial dimension is smaller than traditional hydrodynamic bearing.
 
12. It can bear both radial and thrust loads.
 
13. In a large load-speed range, unique design can achieve excellent performance.
 
14. Bearing performance is relatively insensitive to the fluctuations of load, speed and running speed.

classification

Classification by structural type
 
According to the structure of rolling element and sleeve, it can be divided into:
 
 
 
Deep groove ball bearings, needle bearings, angular contact bearings, self-aligning ball bearings, self-aligning roller bearings, thrust ball bearings, thrust self-aligning roller bearings, cylindrical roller bearings, tapered roller bearings, spherical bearing with seat, etc.
 
Rolling bearings can be divided into:
 
1. deep groove ball bearings
 
Deep groove ball bearings are simple in structure and easy to use. They are the most widely used type of bearings with the largest production batch. It is mainly used to withstand radial loads, but also can withstand certain axial loads. When the radial clearance of the bearing increases, it has the function of angular contact bearing and can bear large axial load. Applied in automobiles, tractors, machine tools, motors, pumps, agricultural machinery, textile machinery and so on.

 
2. needle roller bearings
 
Needle roller bearings are equipped with slender and long rollers (the length of the rollers is 3-10 times the diameter, and the diameter is generally less than 5 mm), so the radial structure is compact. When the inner diameter size and load capacity of needle roller bearings are the same as other types of bearings, the outer diameter of needle roller bearings is the smallest, and it is especially suitable for supporting structures whose radial installation size is limited. According to the different use occasions, the bearing without inner ring or needle roller and cage assembly can be selected. At this time, the journal surface and the outer shell hole surface matched with the bearing directly act as the inner and outer rolling surface of the bearing, in order to maintain the same load capacity and operation performance as the ring bearing, the hardness of the raceway surface of the shaft or shell hole, the processing accuracy and table. The surface and surface quality should be similar to the raceway of bearing rings. This kind of bearing can only bear radial load. For example: universal joint shaft, hydraulic pump, sheet mill, rock drill, machine tool gearbox, automobile and tractor gearbox, etc.

 
3. angle contact bearing
 
Angular contact ball bearings have a higher limit speed, can bear both longitudinal and axial loads, and can also bear pure axial loads. The axial load capacity of angular contact ball bearings is determined by contact angle, and increases with the increase of contact angle. For: oil pump, air compressor, all kinds of transmission, fuel injection pump, printing machinery.
 
4. aligning ball bearing
 
The self-aligning ball bearing has two rows of steel balls, the inner ring has two raceways, and the outer ring raceway has an inner spherical shape, which has the function of self-aligning. It can automatically compensate the coaxiality error caused by the bending of the axle and the deformation of the shell. It is suitable for the parts whose support holes can not guarantee strict coaxiality. This kind of bearing mainly bears radial load, while bearing radial load, it can also bear a small amount of axial load. Usually it is not used to bear pure axial load, such as pure axial load, only a row of steel balls. Mainly used in agricultural machinery such as combine harvester, blower, paper machine, textile machinery, woodworking machinery, bridge crane wheel and transmission shaft.

 
5. self aligning roller bearing
 
The self-aligning roller bearing sentence has two rows of rollers, which are mainly used to bear the radial load and the axial load in any direction. This kind of bearing has high radial load capacity and is especially suitable for working under heavy load or vibration load, but it can not bear pure axial load. It has good alignment performance and can compensate the same bearing error. Main Applications: Paper-making machinery, deceleration device, axles of railway vehicles, gear box seat of rolling mill, crusher, decelerator for various industries, etc.
 
6. thrust ball bearing
 
Thrust ball bearing is a kind of separated bearing. The bearing ring "seat ring" can be separated from the assembly of the cage steel ball. The shaft ring is a ring matched with the shaft, the seat ring is a ring matched with the bearing seat hole, and there is a gap between the shaft and the ring. Thrust ball bearings can only bear the axial load, unidirectional thrust ball bearings can only bear the axial load in one direction, and bidirectional thrust ball bearings can bear the axial load in two directions. The thrust ball bears the radial displacement of the axis which cannot be limited, and the limit speed is very low. One-way thrust ball bearings can limit the axial displacement in one direction of shaft and shell, and two-way bearings can limit the axial displacement in two directions. Mainly used in automobile steering mechanism, machine tool spindle.
 
7. thrust roller bearing
 
Thrust roller bearings are used to bear axle loads. Longitudinal combined loads, but the longitudinal loads should not exceed 55% of the axial loads. Compared with other thrust roller bearings, this kind of bearing has lower friction coefficient, higher speed and self-aligning ability. The roller of 29000 type bearing is asymmetrical spherical roller, which can reduce the relative sliding of the rod and raceway in work, and the roller is long, big in diameter, large in number and multi-load capacity. Oil lubrication is usually used, and grease lubrication can be used in some low-speed situations. In design selection, priority should be given to selection. Mainly used in hydraulic generators, crane hooks, and so on.
 
8. cylindrical roller bearings
 
Rollers of cylindrical roller bearings are usually guided by two baffles of one bearing ring. The cage, the roller and the guide ring form a set of components, which can be separated from another bearing ring and belong to separable bearings. This kind of bearing is easy to install and disassemble, especially when the interference fit of inner, outer ring and shaft and shell is required. Such bearings are generally only used to withstand radial loads, only single row bearings with inner and outer rings with retaining edges can withstand smaller steady axial loads or larger intermittent axial loads. Mainly used for large motors, machine tool spindles, axle box, diesel engine crankshaft and automobiles, bracket bearing box, etc.
 
9. tapered roller bearings
 
Tapered roller bearings are mainly suitable for bearing radial and axial combined loads, while large tapered angle tapered roller bearings can be used to bear radial and axial combined loads. The bearing is a separated bearing with inner ring (including tapered rollers).