The importance of a, bearing on the mechanical equipment
Bearing in the process of "" of low speed and heavy loading operation, the motor sliding bearing can rotate converted into mechanical power and change the direction of movement, its use lifespan to improve equipment availability and productivity have the effect of key components, so in production, to strengthen the inspection tour of equipment bearing regularly at ordinary times, gas, oil changes, maintenance is extremely important.
Second, the classification of the bearing
Bearing can be divided into two categories, namely, sliding bearing and rolling bearing.Sliding bearing has two forms: the first kind, stationary, bearing and bearing pouring into an organic whole, the second split type, bearing and the bearing seat fission.This kind of composite bearing to facilitate maintenance.Rolling bearing is divided into four forms:
(1), thrust bearing, bearing axial load;
(2), angular contact bearings, bearing radial and axial load.
(3), the centripetal bearing, bearing radial load;
(4), general bearing.Bearing is widely used, different equipment performance, load characteristics, technical requirements, different types of bearings and the configuration.
According to the relevant state regulations on use of bearing, the highest temperature in the operation of the sliding bearing in no greater than 60 ℃, the highest temperature rolling bearing in the operation principle of not greater than 70 ℃.Top oil temperature not to exceed 60 ℃, otherwise easy to bearing damage and breakage.
The formation of the three, bearing damage and failure
Bearing damage and failure are serious loss of oil formation, fatigue damage, impurities into the damage caused by permanent deformation and protection frame.
In daily inspection tour:
(1) - oil level height, check the gas recording time, oil, grease add quantity and each device of bearing oil specifications are correct.
(2) listen to - use needle tools for equipment whether there is unsmooth phenomena in the operation, with and without noise, operation is stable.
(3) touch - available thermometer temperature, also can use hand to touch the bearing shell temperature, whether within the controllable range numerical requirements specification.
Fourth, the check method of bearing, prevent injury
In our daily inspection work, hear, touch, see inspection method, know the bearings used in production in the process of operation principle and maintenance of common sense.Sliding bearing is mainly used in high speed, low speed heavy load devices, such as: turbo-generator set, rotary kiln of wheelset, coal mill, cement mill, large motor, it is the nature of the sliding friction, so the equipment lubrication method with the method of thin oil terminal water cooling, oil circulating in produce a layer of isolation between shaft and bearing oil film, the lubrication effect, at the same time reduce the friction heat generated by the bearing shell.
Rolling bearing is mainly used in small motor, reducer, transmission shaft, roller device, such as it is rolling friction is nature, ways of rolling bearing lubrication is grease, lubricating oil or solid lubricant.Clearance of rolling bearings (the oil clearance), is to ensure that the normal operation of the rolling body, lubrication and the amount of compensation for thermal expansion.The purpose is to prevent dust bearing seal body.Water enter the bearing, and prevent loss of lubricating oil.Bearing and shaft assembly, measuring shaft diameter size and bearing inside diameter size, avoid too close too loose phenomenon, with easy to make oil tight hold small gap clearance, bearing temperature rise;Running too loose assembly, bearing inner sleeve or coat, the shaft and bearing damage.It is forbidden to directly with hammer percussion when bearing assembly, but adopt the method of copper bar or sleeve transition into line.
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