Six kinds of vibrating screen common failures and handling methods
Vibrating screen is mainly used for quarry screening sand and gravel materials, but also for coal, mineral processing, building materials, electric power and chemical industries for product classification. Vibrating screen failure and treatment methods are also increasingly being paid attention to by users, common vibrating screen failure analysis as follows:
1. Vibrating screen can not start or amplitude is too small, should check whether there is an electrical obstacle, whether the motor is damaged, or whether the voltage is insufficient, these are no problems, and then check mechanically, whether the material on the screen surface of the vibrating screen is piled up too much, if so, remove. Exciter on the coupling joint bolts have not fallen off, whether the grease thickened caking, at this time can be cleaned to repair the exciter, and then properly adjust the eccentric shaft weighted block or vice eccentric block position.
2. Vibrating screen screen surface material flow abnormal, one is the screen box stiffness is not enough, there is a critical frequency, coupling bolts become loose, the problem appears on the tightening parts. Second, the lateral level of the screen box is not found, from the support of the foot spring support seat or spring itself to find the fault, change the spring or change the size of the support seat, there may be a broken screen surface network caused, as long as the replacement of the screen can be. If it has been due to insufficient rigidity of the sieve box, the horizontal level is not found, it will cause the beam to break, such as still in operation will also make the material flow abnormal. There may also be improper operation, that is, the feeding is extremely unbalanced is also one of the reasons.
3. Vibrating screen sieving quality is not good, the reason is the responsibility of improper operation more, may mesh blockage, into the sieve material in the fines increase and moisture increase, so that the sieve on the material layer is too thick, give material unevenly, etc.. Maybe the two sides of the screen mesh is not pulled tight, if the shaft eccentric vibration of the possible belt dragging in the forceless, the belt is too loose, and so on mechanical problems are dealt with, can come to a period of time of reverse rotation to improve the quality of screening.
4. Vibrating screen rotation becomes slow, bearing heat, this situation, indicating that the usual maintenance did not keep up, bearing lack of grease, if the new grease, it is the quality of grease or add too full, poor quality oil to make the bearing blockage labyrinth seal jam, so the quality of grease is quite important.
5. Circular vibrating screen noise is too large, may be bearing damage, bolt loosening, beam fracture and spring damage, in addition to the bolt can be tightened, the other three conditions are required to replace parts.
6. Vibrating screen side plate crack, beam fracture, structural damage, such a situation will not be sudden, the critical frequency under the working time is too long, such as a large number of fastening side plate of high-strength bolts loose, spring serious deformation so that the left and right height difference is very much, there may be eccentric block each weight error is too large, causing structural damage, wall plate crack, and even beam fracture, replace the damaged parts, tighten the bolts in addition When repairing the wall plate cracks, two small 6m/m holes must be punched at the second end first to prevent the cracks from extending, and don't forget to punch a few air holes on the reinforced plate when patching the reinforced plate.
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