The rubber dust cover is used to seal some mechanical equipment, it is mainly to avoid leakage of mechanical equipment.
Leakage is one of the common problems of mechanical equipment. There are two main reasons for leakage: First, because of the results of mechanical processing, the appearance of mechanical commodities must have various defects and shape and dimensional errors. Therefore, gaps will inevitably occur at the connection of mechanical parts; If there is a pressure difference, the working medium will leak through the gap.
Reducing or eliminating voids is the primary way to prevent leakage. The effect of sealing is to seal the gap between the joint surfaces, block or cut off the leakage channel, add resistance in the leakage channel, or add small work components in the channel to form pressure on the leakage, which is somewhat different from the pressure difference that causes leakage Offset or balance thoroughly to prevent leakage.
Leakage, that is, under the effect of pressure difference, the leakage of the sealed medium through the capillary of the seal material is called leakage;
Diffusion, that is, under the effect of the concentration difference, the material transfer of the sealed medium through the sealed gap or the capillary of the sealed material becomes dispersed.
The dust cover is a stamping part used on the front and rear axles of various types of cars. At present, most of them are made by the whole forming process and then split. The common technical route is: blanking and punching → stretch forming → cutting and flanging → punching and cutting inner hole → split.
Seals can be divided into two categories: static seals between relatively stopped joint surfaces and dynamic seals between relatively moving joint surfaces. The static seal is mainly a little sealed, three types of glue seal and touch seal. According to the working pressure, static seal can be divided into middle and low pressure static seal and high pressure static seal. Medium and low pressure static seals are usually made of softer materials with wider gaskets. High pressure static seals use harder materials and touch metal gaskets with very narrow widths. Dynamic seals can be divided into two fundamental types: rotary seals and reciprocating seals. It can be divided into touch seals and non-touch seals according to whether the parts moving relative to the seal and its effect are touching. Generally speaking, the touch seal has good sealing performance, but it is subject to conflicting wear and is suitable for occasions where the linear velocity of the sealing surface is low. Non-touch seals have poor sealing properties and are suitable for higher speed applications.