Heavy fishtail knife for shield machine

Abstract

The invention provides a heavy fishtail knife for a shield machine. The heavy fishtail knife comprises a base, a main fishtail knife board and two auxiliary fishtail knife boards, wherein the main fishtail knife board and the auxiliary fishtail knife boards are arranged on the upper surface of the base, the auxiliary fishtail knife boards are located at the two sides of the main fishtail knife board respectively, first cutters are arranged on the main fishtail knife board at intervals, second cutters are arranged on the auxiliary fishtail knife boards at intervals, when the base rotates, the movement loci of the centers of the tops of the first cutters and second cutters are located on a same circular conical surface, and the accumulated movement loci of the first cutters and second cutters cover the area swept by the main fishtail knife board. The heavy fishtail knife for the shield machine has the advantages that through the arranged auxiliary fishtail knife boards, not only can stress of the main fishtail knife board be shared, but also the risk that the main fishtail knife board is damaged to be broken is reduced; the combination of the main fishtail knife board and the auxiliary fishtail knife boards can cope with higher impact, so that the structural strength is high, the rock breaking ability is high, and the service life is long.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to a heavy-duty fishtail knife for a shield machine. Background technique [0002] The shield machine is a special construction machine for tunneling. The front part of the existing shield machine mainly includes: the frontmost cutterhead, the front shield cutting ring at the rear part of the cutterhead, and the rear soil bin. The cutter head is equipped with hobs, scrapers, leading knives and other cutting tools, and the openings on the cutter head form the slag inlet. When working, the cutter head rotates, and various knives are installed on the cutter head to complete the excavation and cutting of the soil. The cut soil enters the cutting ring of the front shield and the soil bin at the rear through the slag inlet on the cutter head, and is transported backward. [0003] When the shield machine excavates in the soft soil layer, because the cutter head cannot be e...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned fishtail center cutter is a single-plate design. In relatively hard sand and sand and pebble formations, ordinary single-plate fishtail cutters can no longer meet the soil disturbance and cutting requirements of the center section. In order to cope with higher impact and high wear rate, it is necessary to design a heavy-duty fishtail knife with higher rigidity and strength, more impact resistance and wear resistance

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