Wear is a common type of problem with crushers and has plagued many users. After the worn parts are eliminated due to the failure to use the standard, the replacement of the new parts increases the production cost, what should we do? We can try to repair the worn parts and extend the service life.
1. Repair of eccentric shaft
The main wear forms of the eccentric shaft are severe wear of the journal and eccentric section journals, excessive bending of the axis and fatigue fracture.
If the shaft is straightened and reamed, the repair process is complicated, and the repair quality is not easy to guarantee. Therefore, it is rarely used. If such a phenomenon occurs, only scrap it, or change the material of the shaft for other purposes.
The small number of large journal scratches or minor wear and tear or pull Road area, you can manually grinding or gold just pull sand mill repair, it can also be used to repair the scene brush.
Heavier wear can be repaired in three ways:
1) The worn journal light will be processed with the minimum machining amount under the premise of ensuring the design surface roughness, and then the bearings will be prepared according to the matching performance of the original design based on the processed journal size and its deviation.
2) Manual arc welding is used to weld the journal surface and then machined to achieve the original design of the journal size. The surfacing process should be properly selected during surfacing to prevent bending and deformation of the distraction axis. When welding, the electrode should be used reasonably. The diameter of the electrode should be small and the current intensity should not be too high. A reasonable centering reference should be selected during post-grinding to maintain the operational accuracy after assembly.
3) The journal sleeve is set, the worn journal is lighted, and a steel sleeve is additionally made. The inner hole and the journal of the steel sleeve shall be an interference fit, and the outer diameter shall be processed according to the original design size and tolerance. The steel sleeve shall be hot-mounted on the journal, the thickness shall be Dd>b, D shall be the outer diameter of the steel sleeve, d shall be the diameter of the journal, and b shall be the thickness of the bearing at the joint of the journal (the thickness of copper or babbitt) .
2, bearing repair
Commonly used sliding bearing materials are bronze and babbitt. Crushers with recirculating lubrication have less accidental wear due to good lubrication and cooling conditions. When the bearing pads are worn, replace the new tiles to restore their performance. Oil tank lubrication or glycerin-lubricated bearings have more accidental wear and are usually repaired by hand scraping. More serious wear can be repaired by local repair welding and scraping.
The jaw crusher bearings also use rolling bearings. If the cylindrical rolling bearings are damaged, new rolling bearings must be replaced. If the inner ring of the bearing is fretting, the inner ring and journal of the rolling bearing can be repaired in the field by metal brush plating.
Brush plating technology
The part plating technique, also known as rapid plating, is a new technology for the rapid electrochemical deposition of metals on the surface of parts. Brush plating can repeatedly repair the worn parts of the surface, improve the service life of the parts, and thus reduce the reserve of spare parts. Brush plating can be used according to the different conditions of wear resistance, acid resistance and high temperature resistance of the parts, and different plating solutions can be used to obtain coatings of different materials.
summary
The wear of the eccentric shaft and the bearing is common in the jaw crusher using the sliding bearing. The above repair method is adopted after the wear, which prolongs the service life of the component and reduces the production input, thereby improving the economic benefit of the user to some extent. If you are also worried about the wear and tear of the equipment, don't worry, we will provide more methods of wear and repair for your reference.
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