Introduction to the main bearing of cement mill

Source: China Bearing Network Time: 2014-06-28

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The traditional main bearing of the mill is sealed with wool felt ring; it is easy to be worn; the seal is not reliable. The theory proves that the dust particles enter the main bearing through the gap between the worn wool felt ring and the hollow shaft; these dust particles are The main reason for the abrasive wear and oil passage block of the spherical skf bearing bush; therefore, the sealing equipment should be improved. The author used the radial labyrinth sealing method to improve the sealing method of the main bearing. The specific method is: using the original steel plate One male and one female two sealing steel rings; the male and female sealing steel rings are corresponding to the radial annular labyrinth groove according to the radial labyrinth sealing requirements; and the male and female sealing steel rings are respectively arranged on the main bearing cover and the hollow shaft of the grinding machine; (Paste butter in the labyrinth before the device; to reduce friction; and have a certain sealing effect). This way; the sealing steel ring fixed on the main bearing cap of the mill is not moving; and the sealing steel fixed on the hollow shaft The circle works with the hollow shaft; the sealed labyrinth groove is used to block dust particles and other impurities from entering the main bearing of the mill. The theory indicates; the sealing effect is good; the working rate of the bearing bush is also large Poor gear meshing. The balance shaft gear and the gear axis meshing with it are out of phase. The meshing gears are stuck during the transmission process; the balance shaft is subjected to periodic bending stress; then the balance shaft is exhausted. Cracking.
A large part of the cement mill is due to the smooth construction of the main bearing of the mill. Therefore, it is very important to improve the bearing assembly technology of the bearing bush, improve the sealing method of the main bearing and adopt a reasonable smooth method for the normal operation of the mill. The development of the cement industry; the cement mill is also being carried out for large-scale and automation. Therefore, the cement company performs preventive repair on the cement mill; that is, it is necessary to formulate a meticulous pre-repair plan.
The grinding machine is in the working process; between the hollow shaft journal and the main bearing spherical tile; inevitably, friction, wear and heat are generated; and a part of the power is consumed; that is, the friction power consumption. The bearing is loose. The so-called balance shaft bearing is loose. The common cause of abnormal wear of the seat hole is due to poor engine balance; the active skf bearing is not sensitive; the balance shaft has poor coaxiality of the two seat holes; the axial clearance of the balance shaft is too large, etc. After the work balance bearing is subjected to excessive impact load; incurring balance shaft cracking. In order to reduce friction power consumption, reduce wear speed, flat cushioning and control spherical temperature; it is necessary to ensure outstanding smoothness of the main bearing; Efficiency and service life. Some cement plants; the main bearings of the mill are due to impurities or poor smoothness; constitute the main bearing burnt tile (a major accident); and even lead to the hollow shaft journal wear. It takes about ten hours or even a few days to make corrections; it affects production and constitutes economic loss. In order to deal with the smoothness of the main bearing of the mill and the handling problems; House has been seeking to ensure that the skills of the main bearing apparatus for producing a working method for sealing and smooth way 02.2mx6.5m such as paper, cement mill main bearing as an example;. Talk about some views on their manufacture, installation, sealing and smooth.
When the new device mill is just started, the bearing surface does not constitute an oil film; therefore, before the test run; the smooth oil should be sprayed on the surface of the two shafts of the mill in advance; the Swedish skf bearing is prevented from being pulled by the bearing surface. The test should be completed in time. Replace clean, smooth oil; some fine babbitt particles will occur when the bearing and hollow shaft journals run together; mixing with smooth oil will cause abrasive wear; so it is necessary to install the fault after oil removal. In the diesel engine In the process of disassembly and repair; sometimes the balance shaft is wrongly installed; for example, when the timing gear is installed, the timing mark is incorrectly installed. At this time, the balance smartness can not only balance the effect; it will incur greater oscillation; then form a balance Cracking of the shaft.

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