Vibrating screen bearing damage? This a few way to sieve bearing durable - bearing knowledge

Vibrating screen is the commonly used equipment in mining machinery equipment, its vibration produced mainly by the vibrator, and bad working conditions of the use of the vibrator, and, under the strong shock and vibration is its bearing the inevitable will appear the phenomenon such as fever, burn out, seriously affect the normal operation of vibrating screen. In this paper, share vibrating screen bearing damage reason and solution. 1 a, design reasons. Bearing type selection is not reasonable use of bearing type, the limiting speed, cooperate with size installation, clearance, lubricating, etc. The demand is higher, general bearing under the condition of work is easy to damage. If the design of bearing early improper selection, bearing service life will be shorter. Solution: choose special bearings. Commonly used vibrating screen bearings cylindrical roller bearings and spherical roller bearings. Both have large radial load capacity, the former limit rotational speed is high, the dynamic and static load carrying capacity is strong, but for the bearing hole of the coaxial degree of the demand is higher; The latter self-aligning performance is good, can compensate the coaxial problem caused by the bearing hole processing, but can't afford to pure axial load. 2. Lubrication sealing structure design is not reasonable at present domestic many vibrator bearing with grease lubrication, labyrinth seal structure and seal clearance in 1 ~ 2 mm. But in actual use, with the increase of vibrator bearing temperature, lubricant viscosity reducing gradually, spindle, high speed rotation in maze cover grease spilled from the labyrinth cover, eventually lead to bearing damage due to lack of lubrication. Due to the lubrication sealing structure design is unreasonable, inadequate bearing lubrication, is lead to deformation of the bearing heats, and the main reason for the loss. Solution: use thin oil lubrication, improve lubrication channels, improve the sealing structure. Nowadays, many factories adopt thin oil circulation lubrication, labyrinth seal and other non-contact seal structure. 3. Bearing and the bearing hole with incorrect bearing and the bearing hole tolerance is the key of the design. If the choice is greater than surplus to cooperate, will force bearing raceway geometry deformation shape, abnormal vibration during operation. If choose the larger clearance fit, can make the bearing outer ring in the relative sliding bearing hole, rose sharply result in bearing damage. Solution: choose reasonable tolerance. Bearing inner ring with shaft adopts loose or transition fit clearance fit tolerance, outer ring and the bearing holes are relatively tight interference fit tolerance of the transition or smaller. 4. When the design not considering the expansion amount of shaft vibrator operating temperature in 35 - commonly Is due to the heat bilges cold shrink 60 ℃, the expansion amount can not be ignored. Solution: will end bearing designed transition or clearance fit, so that the vibrator shaft when heat bilges cold shrink can be sliding relative to the inner ring. Second, technological reason 1. People who share the shaft bearing hole of the machining accuracy is not enough, two different bearing hole. Solution: the processing of high precision equipment, in the nc boring and milling machine or machining center, two bearing hole cutting completed at a time. 2. Uneven force bearing assembly, such as in cold assembly process, applying pressure on bearing inner and outer ring, lead to relative shaft bearing inner and outer circle or bearing hole of produce certain deviation, will wear in the process of running faster. The solution: use special tooling, make bearing inner ring or outer ring uniform compression in the process of assembly, assembly in place. 3. Bearing installation is not clean, or lubricating oil is not clean, lead to bearing raceway wear and friction roller increases, temperature, the bearing damage. The solution: bearing clean before assembly. Vibrator used replacement lubricating oil regularly, for the first time in lubricating oil after equipment use 150 h, 1000 h after each run. 4. Group eccentric block quality difference, or group eccentric block installation Angle error is bigger, cause vibration source center, bearing heating. Solution: adjust the eccentric block and quality point of view, the symmetry is consistent. When installing or adjust the exciting force, to make the same shaft Angle of eccentric block is consistent, the eccentric block on the parallel axis symmetry. Three, use and maintenance reason 1. By basic uneven or spring seat installation is not correct, cause the abnormal motion of sieve body, the vibrating screen rotation or distortions, vibrator damaged bearing heating. Solution: adjust the base level. Installation, the first level measurement basis level, such as uneven can be adjusted by means of plate on foundation. 2. Vibrating screen great error in the center of gravity, causing the screen body is not functioning, damaged bearing heating. Solution: vibrating screen ideal working state is stable running, everywhere amplitude is consistent, so we will strictly control the product production, installation accuracy, guarantee not offset center of gravity position, there are both at the same time as far as possible into the material. 3. Vibrator fixed bolt looseness, or without locking spring washer, cause vibration source center, the damaged bearing heating. Solution: first use vibrator, run after 2 h and 50 h to re-examine the bolt, found loose fastening immediately. 4. Improper lubrication, filled with too much or too little, can cause bearing heating. Solution: under normal circumstances, it is advisable to two-thirds of the lubricating oil lubrication chamber will be listed, too much heat, and must use exhaust exhaust bolt. Generally in the case of not leak, vibrator - 80 100 h filling a lubricating oil, a charging less than 1 kg, and discharge waste oil in time. Vibrator is the power source of vibrating screen, improve the quality of design and processing, the correct use and careful maintenance is the prerequisite of vibrator bearing running condition.