Exchangeable blade type center cutter for shield machine

Abstract

The invention belongs to the technical field of tunneling assembly, relating to an exchangeable blade type center cutter for a shield machine; the center cutter comprises a blade seat, a center cutter block and three side cutters; a center cutter block locating post and three knife rests are arranged on the blade seat; the middle part of the locating post is provided with a center cutter block locating hole; the bottom part of the center cutter block is fixedly connected with the blade seat; a cone-shaped lug boss is fixedly connected with the end of the locating post; an inner hole is arranged on the cone-shaped lug boss; the sizes of the inner hole of the lug boss and the center cutter block locating hole are matched with that of the center cutter block; three knife rests are arranged on the periphery of the center cutter block locating post; a groove joint which is fixedly connected with the side cutter is arranged on each knife rest; locating holes are arranged on the three side cutters and are respectively fixedly connected in the groove joints of three knife rests through bolts; three cutter arms formed by the side cutters and the knife rests form an included angle of 120 degrees. The center cutter has better stability in the tunneling process, higher impact resistance and abrasion resistance, and is easy to replace the blade, so that the waste of resource is avoided and the construction cost is saved; therefore, the center cutter has higher economical value.

Description

technical field [0001] The invention belongs to excavation machinery accessories, in particular to a shield machine tool. Background technique [0002] At present, the shield machine is more and more widely used in underground engineering. As one of the key components of the shield machine, the cutter head device will directly affect the performance and efficiency of the shield machine. The reasonable selection and layout of various knives on the cutter head is an important content to be considered in the design process of the cutter head. The center knife is the frontmost tool of the shield machine, and its service life plays a very important role in the entire cutter head system. The service life of the center knife has a direct relationship with its own structure and installation method. [0003] In the existing shield machine cutter head system design, the center knife used is generally welded to the bottom plate of the shield machine, and is connected with other tools...

AI Technical Summary

Problems solved by technology

However, most of the current shield machine equipment adopts the connection form of the center knife arm as welding, that is, it is a non-detachable connection, resulting in the non-replaceable blade, which has very high requirements on the performance of the alloy material on the center knife; in the knife arm In the case of unbalanced wear, if the tool wear is not corrected, the diffuse wear of each tool arm of the center tool will be intensified, which will have a significant impact on the entire tool head system and even the tunneling system; if the entire tool is replaced, construction will inevitably be increased cost, waste of resources

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