Center cutter of shield tunneling machine

Abstract

The invention discloses a center cutter of a shield tunneling machine. The center cutter of the shield tunneling machine comprises a cutter seat, a center cutter body, four edge cutter seats and four side cutters; the cutter seat is in a shape of a circular plate; the center cutter is welded and fixed in the center of a base; the four edge cutter seats are welded and fixed to the periphery of the center cutter by a central symmetry manner; the four edge cutters are respectively fixed to the side surfaces of the four edge cutter seats through bolts and nuts; the edge cutters and the edge cutter seats form four cutter arms which mutually form included angles of 90 degrees. The center cutter of the shield tunneling machine has the advantages of being long in service life, stable to bear, high in tunneling efficiency, high in economy, small in manufacturing cost, and convenient to mount and use.

Description

technical field [0001] The invention relates to mechanical accessories of tunnel construction equipment, in particular to a center knife of a shield machine. Background technique [0002] At present, in the construction of underground engineering, shield machines are more and more widely used. As one of the key components of shield machines, the cutterhead device will directly affect the performance and efficiency of shield machines. The center knife is the frontmost tool of the shield machine, and its service life plays a very important role in the entire cutterhead system. The service life of the center knife has a direct relationship with its own structure and installation method. The center knife used in the existing shield machine is generally welded on the cutter head of the shield machine. The structure of the center knife is generally fishtail shape, and two knife arms are often used, which are arranged in a line and symmetrical to the center line of the cutter head...

AI Technical Summary

Problems solved by technology

The center knife used in the existing shield machine is generally welded on the cutter head of the shield machine. The structure of the center knife is generally fishtail shape, and two knife arms are often used, which are arranged in a line and symmetrical to the center line of the cutter head. The shaft forms an axisymmetric structure, and is fixed by welding, which is a non-detachable connection, so the blade cannot be replaced. After the blade is worn out, the entire center knife has to be replaced, which is costly and a serious waste of resources.

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