What is the key issue for toothed chain sealing and lubrication?

Question

Accepted Answer

Sealing and lubrication are the key issues in the design of the toothed chain assembly, because most of the failure of the toothed chain assembly is due to the early failure of the bearing due to the entry of the lubricating medium into the debris, the sealing structure and the original due to lubrication and heat dissipation problems. Early failure. Therefore, the flexible conveyor seal and lubrication can not be considered separately, but a purposeful and foreseeable deployment design according to the specific structure and use environment. At present, the sealing method of the toothed chain assembly can be divided into the following types:

1. Rotary oil seal seal This seal is easy to realize, simple in structure and processing, convenient in disassembly and assembly, and low in cost. The disadvantage is poor sealing ability and low service life. Therefore, most of them are applied to small scraper conveyor equipment.

2, floating seal floating seal has the advantages of high sealing performance and long service life. Widely used in scraper sprocket assemblies. At present, most of the domestic use of two types of floating seals: 0-ring type and rectangular (diamond) ring type. 0-ring floating seal with automatic centering. Adapt to occasions with large angular deviations. The rectangular (diamond) ring type floating seal has the advantages of inaccurate axial deviation, simple sealing chamber shape and easy processing and assembly. Both types of floating seals require: the quality of the rubber ring is stable, especially the elasticity is excellent, and has good adaptability; for the iron ring, the flatness of the bright band is required to be high, and the wear resistance and heat resistance are good.

3, labyrinth, felt ring, dust ring auxiliary seal labyrinth, felt ring, dust ring is a necessary auxiliary link, flexible conveyor should be actively arranged when space allows. This promotes the sealing of the sprocket assembly. In fact, the main idea of sealing and dustproof should be: dust is worse than dust. If you can use a good structure to avoid the location of the polluted environment such as coal dust, it will have a multiplier effect on the seal.

In summary, the problem of toothed chain sealing and lubrication needs to be considered.