Automatic switching device for working hob and standby hob of shield machine

Abstract

The invention discloses an automatic switching device for a working hob and a standby hob of a shield machine. The automatic switching device comprises a shell, a rotating device and a retractable supporting device. An inner cavity of the shell is formed by the surface of a truncated cone, and the included angle of the axis OA of the cavity and the axis OB of a tunnel opening hole is alpha; the shell is welded to a cutterhead face plate of the shield machine; the rotating device is embedded in the cavity of the shell and provided with two hob assemblies which are in central symmetry along theaxis OA of the cavity and are of the same structure, and the axis of the working hob assembly is overlapped with the axis OB of the tunnel opening hole; an exchange sealing device is arranged in the position, located on the periphery of a cutting edge containing chamber, between the shell and the front end of a main body; and the retractable supporting device comprises a linear slurry dischargingsleeve and hydraulic cylinders, the axis of the sleeve is overlapped with the axis of the working hob assembly, and the sleeve can move forwards and backwards along the axis of the working hob assembly. The personal safety of workers is guaranteed, the times of shutdown for replacing the hobs are reduced, the operation efficiency is improved, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel excavation construction shield equipment maintenance, and in particular relates to an automatic switching device for a spare hob installed on a cutter head of a shield machine. Background technique [0002] The hob is easy to wear due to its harsh working environment. In all current designs, only one hob can be installed in each tool seat hole. During construction, it needs to be stopped frequently for replacement according to the wear of individual hobs. It is an important cause of low construction efficiency. And because the shield machine is in the construction process at this time, in order to maintain the stability of the excavation surface and prevent water gushing, the pressure of the excavation surface must remain unchanged. It is not only cumbersome and time-consuming to gradually step down and exit after the job is completed, but also poses a great threat to the life and health of the st...

AI Technical Summary

Problems solved by technology

[0002] The hob is easy to wear due to its harsh working environment. In all current designs, only one hob can be installed in each tool seat hole. During construction, it needs to be stopped frequently for replacement according to the wear of individual hobs. It is an important reason for the low construction efficiency

And because the shield machine is in the construction process at this time, in order to maintain the stability of the excavation surface and prevent water gushing, the pressure of the excavation surface must remain unchanged. It is not only cumbersome and time-consuming to gradually step down and exit after the job is completed, but also poses a great threat to the life and health of the staff

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