Central fishtail cutter

Abstract

The invention discloses a central fishtail cutter and belongs to the field of parts of shield tunneling machines. The central fishtail cutter comprises a cutter holder, a first cutter body, an additive injection block and two second cutter bodies, wherein the two second cutter bodies are respectively and symmetrically arranged on two sides of the first cutter body and are vertically fixed on the first cutter body; the bottoms of the two second cutter bodies are fixed on the cutter holder; a second accommodation groove is formed in a position, corresponding to the additive injection block, of each second cutter body; the additive injection block is located in an accommodation cavity and is mounted in an additive injection block mounting hole; injection channels are formed in the first cutter body and the two second cutter bodies; a plurality of injection holes are formed in the position, corresponding to the accommodation cavity, of the additive injection block; the lower injection holes are connected with the injection channels through connection tubes. Through the central fishtail cutter, the injection channels of the first cutter body and the second cutter bodies are capable of guiding additives in the additive injection block to outlets of the injection channels through the connection tubes, so that the injection range of the additives can be broadened; the problem of formation of mud cakes can be effectively avoided.

Description

technical field [0001] The invention relates to the field of shield machine accessories, in particular to a central fishtail knife. Background technique [0002] The shield machine is a special construction machine for tunneling. The center fishtail knife of the existing shield machine includes a cutter body and a cutter seat. The cutter body is plate-shaped and the top is pointed. Drive the center fishtail knife to rotate. Because the center fishtail knife cuts the soil in a rotating manner, it is easy to form mud cake near the rotation center of the central fishtail knife. The formed mud cake will affect the tunneling speed of the shield machine, seriously It will cause excessive wear of the cutter head, which will reduce the safety of the shield machine. In order to prevent the problem of mud cake near the rotation center of the center fishtail knife, technicians open a through hole on the knife body, set an additive injection block in the through hole, and fix the addi...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing technology cannot fundamentally solve the central mud cake of the central fishtail knife of the shield machine, the embodiment of the present invention provides a central fishtail knife

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