The failure of SKF Bearing of dismantling shale shaker
The bearing capacity, rotation accuracy and wear resistance of rolling bearing will change due to its own quality and external conditions When the performance index of Timken bearing is lower than the use requirements and can not work normally, the bearing will fail or even fail. Once the bearing fails and other accidents occur, the machine and equipment will stop running, loss of function and other abnormal phenomena will occur. Therefore, it is necessary to find out the causes in a short time and take corresponding measures
The failure of SKF Bearing of dismantling shale shaker
In order to maintain the proper performance and long-term use of the bearing under good conditions, the bearing must be inspected and maintained. Inspection and maintenance are very important to prevent faults. During operation, the rolling sound, vibration, temperature and lubricant of the bearing should be checked
One kind of rolling bearing noise is generated by Timken bearing itself, that is, the inherent noise of the bearing; The other is the noise generated after the bearing is installed, which has nothing to do with the noise of the bearing itself By listening to the sound, we can analyze some problems A) inherent noise: raceway sound “the sound of various bearings and rolling friction (cylindrical roller bearings) is the inherent sound of rolling bearings.” Raceway sound is a continuous and smooth sound produced by the elastic characteristics of the rolling element when it contacts the raceway.
When the bearing rotates, the rolling element rolls on the raceway; Abnormal rolling friction sound can make uncomfortable abnormal metal friction sound such as “creak, creak”, which will not be made when the lubrication is good.
Therefore, it is not a problem in general, and attention should be paid only after the noise increases. B) noise related to bearing manufacturing: here includes cage noise and chatter. Cage noise mainly occurs in ball bearing and tapered roller bearing, When the bearing rotates, it will make a sound due to the vibration of the cage and the impact between the cage and the rolling element. This sound is periodic. Chatter (various bearings) is a sound with a certain frequency, which is caused by the vibration caused by large waviness on the raceway surface. C) noise caused by improper use:
it exists for all kinds of bearings. When the surface of the bearing raceway or the surface of the rolling element is damaged, dented and rusted, Then there will be periodic noise and vibration Dirt noise will be generated when dust invades the bearing during operation This noise is aperiodic and also accompanied by vibration. Its sound size is not fixed, sometimes not
The effect of bearing vibration on Timken bearing failure is obvious For example: peeling, indentation, corrosion, crack Wear, etc. will be reflected in the bearing vibration detection, so the vibration can be measured by using special bearing vibration measurement devices (frequency analyzer and vibration instrument, etc.
And the specific situation of abnormal vibration can be inferred through the frequency distribution. The measured values vary according to the service conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance and determine the judgment standard
Generally, the temperature of Timken bearing rises slowly with the start of operation and reaches a stable state after 1 to 2 hours The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine If the lubrication and installation are not appropriate, the bearing temperature will rise sharply and abnormal high temperature will appear.
In this case, the machine must be shut down and necessary preventive measures must be taken Because Timken bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel and lead to bearing damage.
The bearing shall be equipped with a special mold during assembly, which cannot be knocked at will. When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Pneumatic or hydraulic pressure is required during assembly. During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the bearing channel will be damaged due to stress and the bearing will make a guide sound.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
When the bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balance into the bearing, so it is necessary to perform dynamic balance before installing Timken bearing. In order to facilitate assembly, some manufacturers apply some oil or grease in the bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
If more oil or grease is accumulated in the bearing chamber, it is easy to enter the bearing along the shaft when the bearing rotates. The bearing shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in the bearing chamber.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The feature of paint rust is that it often occurs in sealed motors. The sound of the motor is very good during assembly, but after it is put in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the bearing is removed. In the past, many manufacturers thought it was the problem of Timken bearing. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
After our continuous publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the bearing channel and leads to bearing damage. At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The service life of the bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make the bearing in the running state, so as to prolong the service life of the bearing. How to measure the bearing clearance and how to ensure the accuracy of the clearance measurement are the problems often encountered by many users in measuring the bearing clearance. Here are some measurement methods, aspects to pay attention to and some measurement skills of Japanese NTN bearings.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Bearing clearance refers to the movement amount of the bearing when one side of its inner ring or outer ring is fixed when it is not installed in the shaft or bearing housing, and then the unfixed side moves radially or axially. Generally speaking, when the bearing rotates slowly, it will stop for a long time. On the contrary, if the rotation time is short and the stop is sudden, the flexibility is not good. According to the moving direction, it can be divided into radial clearance and axial clearance. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The measurement of the radial clearance of the whole set of bearings is not easy. The measuring force causes the elastic deformation of the ferrule and the rolling element itself and its contact. The amount of deformation is a multi factor causing the measurement error, which is related to the measuring force, the contact state and the position of the rolling element.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The rotation flexibility of Japanese NTN bearings is generally checked at the horizontal position. Usually fix the inner ring (or hold the inner ring by hand) and rotate the outer ring by hand to check whether there is abnormal sound and blockage during bearing rotation. Due to different structural types and sizes of bearings, there should be different requirements for their rotation flexibility.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
For example, single row centripetal ball bearings and single row centripetal thrust ball bearings are relatively light when rotating due to the small contact area between the rolling element and the ferrule, while double row centripetal spherical bearings and thrust roller bearings are less light when checking their rotation flexibility due to the large contact area between the rolling element and the raceway and the small weight of the outer ring. For extra large bearings, there should be no jamming when rotating them, and the rotating sound is generally not checked. For tapered hole bearing, the following methods can be used to supplement and check the rotation flexibility of the bearing. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The specific operations are as follows: press the tapered hole bearing into the mandrel until a certain radial preload is added. Under this preload, when a ferrule rotates, the rolling element should rotate. If the rolling element slides instead of rotates, it means that there are too many geometric defects of the ferrule or the size of the rolling element is uneven, and the rotation flexibility of the bearing is poor.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
In the case of close fit between the bearing ring and the bearing seat or transmission shaft, the bearing ring may be deformed by matching with the shape of adjacent components. If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the bearing pedestal and drive shaft to the required tolerances.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The bearing is excited by the change of the number of loaded rolling elements. When a radial load is loaded on a bearing, the number of loaded rolling elements will change slightly during operation, that is to say, it will cause the shift of load direction. At this time, the vibration is inevitable, but it can be reduced by axial preloading, which is applied to all rolling elements (not applicable to cylindrical roller bearings).Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The bearing is partially damaged. A small number of bearing raceways and rolling elements may be damaged due to incorrect operation or installation. In operation, rolling damaged bearing components will produce specific vibration frequencies. The vibration frequency analysis can identify the damaged Japanese NTN bearing components. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Incorrect disassembly of shale shaker SKF Bearing is easy to cause medium and coarse internal damage, which will directly lead to the scrapping of the bearing. Therefore, be extra careful when disassembling the imported bearing of shale shaker SKF, and the axis must be supported during disassembly, otherwise the consequences will be very serious.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Disassembly of SKF Bearing periphery of vibrating screen
Remove the outer ring of the interference fit, set several screws for the outer ring extrusion screw on the circumference of the shell in advance, and tighten the screw equally on one side. Remove it at the same time. These screw holes are usually covered with blind plugs, separable bearings such as vibrating screen tapered roller bearings, etc., and several cuts are set on the housing shoulder. At this time, gaskets should be used, and then removed with a press or gently patted slowly.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Second, disassembly of cylindrical hole bearing of vibrating screen
When removing the inner ring, you can actually use a press to remove and pull it out, which is so simple. At this time, pay attention to make the inner ring bear its pulling force. The inner ring of large vibrating screen bearing is disassembled by oil pressure method. Oil pressure is applied through the oil hole arranged on the shaft to make it easy to pull out. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The SKF Bearing with large width is disassembled by the combination of oil pressure method and drawing fixture. Induction heating method can be used to disassemble the inner ring of the bearing of Nu and NJ cylindrical roller vibrating screen. It is a method of drawing after heating part in a short time to expand the inner ring.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
disassembly of tapered bore bearing
When disassembling the small SKF imported bearing with fixed sleeve, it is necessary to fasten the support inner ring on the bearing, then turn the nut back several times, and knock it down with cushion block or hammer.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
As we all know, the sales volume, quality and quality of SKF bearings are at the forefront of the world. It has its professional flow production line. After strict factory inspection of each process, SKF bearings are sold all over the world to provide support for the industrial development of the world. The quality of SKF imported bearings is an important basis for it to win market recognition, so from what aspects to judge the quality of SKF imported bearings?Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
First, the industrial design of the bearing is reasonable and perfect, with the world level, and the strong quality ensures its service life. SKF Bearing forging must go through rigorous processes such as forging, bearing heat treatment, turning, grinding and bearing equipment. Various processing processes will affect the service life of the bearing. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Among them, the quality of SKF imported bearings is directly related to bearing failure. With the continuous progress of scientific and technological inspection, SKF bearing surface inspection found that the grinding process of metamorphic layer is closely related to the quality of fish SKF bearing surface.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
Second, the metal lottery used in SKF Bearing manufacturing was once a major factor affecting bearing failure. Now, with the continuous progress of metallurgical technology, the extraction of raw materials has been well improved and the quality of materials has been greatly improved. Now the quality factor of raw materials has decreased significantly in bearing failure. At this stage, this problem still exists.
Third, whether the material selection of bearing manufacturing is qualified or not is also a factor that must be considered for bearing failure. In the detection of SKF Bearing Failure, it is mainly to find out and solve the main factors of bearing failure according to a large number of Beijing materials, data analysis, failure environment and forging process, so as to facilitate the continuous optimization, service life and efficiency improvement of SKF Bearing.
Extend the service life of SKF Bearing to avoid sudden early failure of bearing. The installation condition is one of the primary factors in the use factors. Three criteria for judging the failure of SKF Bearing of dismantling shale shaker.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker
The improper installation of SKF Bearing often leads to the change of the stress state between the parts of the whole bearing, and the SKF Bearing operates in an abnormal state and fails early. According to the technical requirements of SKF Bearing installation, use, maintenance and repair, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the running bearing, find out the cause immediately and adjust it to make it return to normal.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker.Three criteria for judging the failure of SKF Bearing of dismantling shale shaker