Double-layer composite sealing and sealing mechanism

Abstract

The invention belongs to the technical field of gearbox housing seal tests, and relates to a dual-layer compound seal blocking mechanism. The blocking mechanism is arranged in a blocking hole and specifically comprises a clamping oil cylinder component, a blocking plate, an upper blocking disc, a lower blocking disc and a middle disc. The clamping oil cylinder component and the upper blocking disc are fixedly connected, and the blocking plate is arranged between the clamping oil cylinder component and the upper blocking disc. The upper blocking disc, the lower blocking disc and the middle disc are in interference fit and are provided with seal rings and elastically connected. During clamping, automatic sealing of the blocking hole can be achieved by means of pushing of an oil cylinder and compressing of the seal rings, automatic reset can be achieved through a balance spring during releasing, cost is reduced, and the flexibility of a machine tool is improved.

Description

technical field [0001] The invention relates to a technique in the field of transmission housing seal testing, in particular to a double-layer composite seal sealing mechanism. Background technique [0002] In the air tightness test of the gearbox casing, the holes on the casing are all sealed with end faces. For holes with a diameter of more than 300mm, or when there are openings on the inner surface of the hole, the use of end face sealing technology can no longer meet the requirements of air tightness testing. Therefore, it is necessary to design a sealing mechanism with a simple structure, so that it can not only meet the sealing requirements, but also be easy to maintain and replace the seal. [0003] After searching the prior art, it was found that Chinese patent document number CN103759006A, published (announcement) date 2014.04.30, discloses an internal expansion sealing device for camshaft holes, including a pull rod, a rear end inner sleeve, an inner sleeve, Fron...

AI Technical Summary

Problems solved by technology

However, when this technology is used for sealing, it is necessary to manually place the mechanism in the required sealing hole, and then move the handle to drive the cam to drive the spring to shrink through the recovery of the pull rod, and the sealing ring will expand and tighten to realize the sealing action; the sealing process needs to be divided into two parts. step, manual operation is required, and the blocking position must also be confirmed manually, which cannot be quickly and automatically located

[0004] After searching the existing technology, it is found that the Chinese patent document number CN204175956U, published (announcement) date 2015.02.25, discloses an internal expansion mechanical sealing mechanism, which uses a cylinder to directly push the sealing mechanism to place the required sealing hole Inside, fix the top of the positioning sleeve on the end face of the required plugging hole, continue to push the pull rod and then compress the spring, and the sealing ring will expand and tighten to realize the sealing action. The diameter of the hole blocked by this device is generally less than 20mm, and it cannot simultaneously Multi-layer shell position for sealing

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