Y-shaped rubber dynamic sealing ring with long and short lips for unilateral sealing and sectional vulcanization process for sealing ring

Abstract

The invention relates to a Y-shaped rubber dynamic sealing ring with long and short lips for unilateral sealing and a sectional vulcanization process for the sealing ring. A V-shaped groove is formed between an inner sealing lip and an outer sealing lip, the inner sealing lip is shorter than the outer sealing lip, the height difference between the inner sealing lip and the outer sealing lip ranges from 1.5mm to 3.5mm, the outer sealing lip functions in sealing while the inner sealing lip does not function in sealing under the action of deformation pressing force, unilateral sealing is realized, and the inner sealing lip functions in storing lubricating greases. The process includes the steps: extruding mixed rubber into a straight-bar rubber blank through a rubber extruder, setting a vulcanization starting point and a vulcanization finishing point for sectional vulcanization on a machining section according to the widths of vulcanization moulds and a hot press table top during vulcanization by using the two vulcanization moulds and a rubber plate vulcanization hot press matched with the table top, wherein Y-shaped sections of mould cavities of the vulcanization moulds are the same in shape and different in length; ensuring non-defective link and transition of rubber, semi-vulcanized rubber and vulcanized rubber in previous mould stripping, next mould feeding and mould closing during vulcanization; and performing vulcanization after ensuring the rubber to enter the moulds at end connection ring positions, and ensuring the strength and the appearance of a joint to be no different from other positions.

Description

technical field [0001] The invention relates to a dynamic sealing ring, in particular to a Y-shaped rubber dynamic sealing ring with unilateral sealing of long and short lips and a segmental vulcanization process thereof. Background technique [0002] Generally, Y-shaped rubber sealing rings are used for dynamic sealing of bearings. At present, Y-shaped rubber sealing rings are commonly used. The inner and outer sealing lips have the same structure. Gas vacuum adsorption is generated in the cavity of the sealing edge, and the friction force is much more affected by the vacuum adsorption force than the deformation and compression force. If the damping of the bearing operation is too large, the dynamic friction force will also increase. The service life of the sealing ring is not long, and it is easy to be damaged and cause the seal to fail. Therefore, when the Y-shaped sealing ring of this structure is used in long-term operation, the sealing ring is very easy to wear, the se...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing Y-type rubber dynamic sealing ring that the double sealing lips tightly suck the bearing surface, the gas vacuum adsorption occurs in the cavity, and the dynamic friction force and operation damping increase, and provide an improved structure. The Y-shaped rubber dynamic sealing ring with long and short lips sealed on one side not only realizes reliable air-tight protection for the bearing, but also avoids salt spray corrosion, corrosion wear, seawater immersion, and toxic and harmful gases from penetrating into the bearing. Bearing wear, prolonging the service life of the sealing ring

Aiming at the disadvantages of vulcanization treatment of the above-mentioned rubber seal rings with large diameters and complex cross-sectional shapes that require corresponding large-diameter mandrels and outer molds, high processing costs and great difficulty, a process for segmentally vulcanized Y-shaped rubber seal rings is provided.

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