Reasons for the broken beam of vibrating screen
Writer： admin Time：2020-10-13 14:37 Browse：℃
The main beam of the vibrating screen refers to the beam that supports the vibrator on the upper part of the screen frame, also called the main beam. Normally, the vibrating screen of the box vibrator has a very compact main beam, and its working condition is very important to the service life of the screen. However, the vibrating screen often encounters the main beam falling off, and it is not easy to repair after falling off, which seriously affects production. So what caused the main beam to break? Let's understand together with the polyurethane screen manufacturer:
One, operation and use factors
According to production experience, the main reasons for the main beam to terminate in use are:
1, bolt softening
If the bolts are loose, the movement of the two vibration exciters will destroy the cycle of inertial force of the main beam. This will inevitably cause the excitation force generated by the vibrator to violently impact the main beam, causing the main beam to be subjected to abnormal impact force, causing the main beam to fall off and break.
2, there are accumulated materials
Excite the beam, and material accumulation often occurs. If it is not cleaned immediately, it will cause serious local wear of the main beam and cause the main beam to break.
3, overload or load start
Overload or load lifting mainly causes great losses to the springs and motors of the screening machine. Frequent overload lifting will destroy the overall force balance of the sand screening machine. The sand screening machine will have different amplitudes before and after, and the movement trajectory of the material will change. , The impact on the screen frame and the screen will increase, causing cracking.
4, improper feeding
Improper feeding of the production system, the impact of the material will not only partially wear the screen of the sand screen, but also destroy the overall force balance of the screen. Therefore, improper feeding has a particularly serious impact on the life of the sand screener.
5. Abnormal driving of the excitation motor
The abnormal operation of the excitation motor will directly cause the main beam to break. Before a similar situation occurs, there will be very unusual noises. Some errors in routine maintenance methods can easily cause such accidents. For example, when the exciter is at a high temperature, using water to cool down has a great impact on the life of the exciter and the screen beam.
6. Excessive excitation force
Excessive vibration force causes a greater load on the sand screener, which seriously affects the service life of the sand screener beam.
2. Manufacturing factors
The production must be in accordance with the requirements of the drawings. Pay attention to the marked technical requirements. If there is a slight negligence in the manufacturing process, the main beam is prone to problems.
Because the design of the main beam has a lot of technical requirements marked on the drawings, the main beam is prone to problems if it is neglected in manufacturing. This is also the problem that Mr. Liu Jianrong, a technical engineer in the vibrating screen industry, has been a headache for so many years, because many manufacturers do not pay attention to it. No matter how much Mr. Liu Jianrong patiently speaks, such problems are always unavoidable. Even foreign vibrating screens will inevitably have main girder fracture accidents, which shows how important the manufacturing quality is to the main girder. Although imported vibrating screens have beautiful appearance, beauty does not solve the reliability problem. The key is internal quality.
Pay attention to the following points during production:
1. Welding: use the specified welding rod, no welding defects are allowed, and the welding process should ensure that the welding deformation is small.
2. Use reasonable technology to ensure the geometric tolerance of the main beam.
3. Carry out heat treatment according to the drawing recommendations.
Use problem
If a factory uses 10 vibrating screens, under the same conditions of use, one of the equipment has no problems, and the others have problems, it means that there is no problem in the design, and there must be a problem in manufacturing or use. Because there is a problem with the design, it is certain that all vibrating screens will have problems.
Someone would say that the main beam is a structural part that is connected to the screen frame with Hooke bolts. It is a structural part that cannot be maintained. Therefore, the main beam is damaged either for design reasons or manufacturing reasons, and has nothing to do with use. This statement must be reasonable, but not comprehensive, because the vibrator is installed on the main beam, and the vibrator and the main beam are connected by bolts. If the bolts are loose, the exciting force generated by the vibrator will violently impact the main beam. The beam was subjected to an abnormal impact force, which caused great damage to the beam. Therefore, a considerable part of the main beam fracture was caused by the loose bolts.
Therefore, the maintenance of the main beam is mainly to check the fastening of the bolts between the main beam and the vibrator, and if it is loose, fasten it in time. Under normal circumstances, check once every week. Once the bolt is loosened, abnormal noise will be generated at the beginning. As the loosening intensifies, the noise will become larger and larger. Therefore, the vibrating screen maintenance personnel must pay attention to the noise of the vibrating screen. If abnormal noise is found in the vibrating screen, stop and check immediately to avoid serious accidents.
If the main beam has a fracture accident, the solution is to groove and weld the crack, and then repair the reinforced version. If it is handled well, the beam can still be used for a period of time. If it is not handled well, it will happen within a few days. After the accident, new beams had to be replaced, and even the entire vibrating screen was scrapped. Therefore, a vibrating screen with a box-type vibrator beam structure is not only complicated in structure, but also difficult to design, manufacture and maintain. However, such vibrating screens are currently on the market because most of the imported vibrating screens have such a structure.
The above is the reason why the vibrating screen beam is easy to break as introduced by Chaishang Trading Co., Ltd. For other questions about the vibrating screen, please refer to other content on this site.
