Combined type shield hob cutter ring

Abstract

A combined type shield hob cutter ring comprises an outer ring and an inner ring. The outer ring is fixedly connected to the inner ring, the inner ring is connected with a hob cutter body in an interference fit mode, the outer ring is of a split type structure composed of a plurality of arc-shaped steel bonded hard alloy blocks, and the multiple steel bonded hard alloy blocks are fixedly connectedto the inner ring. According to the combined type shield hob cutter ring, the hob cutter ring adopts an internal and external double-layer design, when the hob cutter ring adopting the internal and external double-layer design works, the inner ring can effectively absorb the impact load from a cutting edge of the cutter ring, and therefore the probability of edge breaking caused by the impact ofthe cutting edge of the cutter ring is decreased. In addition, the outer ring of the hob cutter ring adopts a split type design, and the probability of fracturing of the cutter ring when the steel bonded alloy outer ring is impacted can be obviously decreased. Moreover, when any one of steel bonded alloy blocks in the steel bonded alloy outer ring cracks or is excessively worn, the steel bonded alloy block only needs to be dismounted and replaced, replacement of the whole ring is avoided, and the using cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of shield machines, in particular to a hob cutter ring for shield machines. Background technique [0002] Shield machine construction has the advantages of high degree of mechanization, fast construction speed, and high safety. It is widely used in tunnel excavation of major projects such as subways, railways, and hydropower. As a key component of the shield machine, the performance of the shield cutter directly affects the tunneling efficiency and cost of the entire project. [0003] The rock-breaking tool of the shield machine is a hob. When working, the hob cutter ring penetrates into the rock face under the action of thrust, and a high-stress crushing zone is formed at the tip of the cutter. As the cutter ring continuously crushes the face, cracks It is also further expanded, and the rock is peeled off from the face in the form of gravel, thereby realizing the crushing of the rock. As the rock-breaking part of t...

AI Technical Summary

Problems solved by technology

As the rock-breaking part of the hob, the hob cutter ring not only bears a large radial rock-breaking force, but also suffers from severe wear of the hard mineral phase of the rock. Therefore, the hob cutter ring is one of the largest consumable parts in tunnel excavation. The limit wear of the hob cutter ring is generally 30mm, and the edge hob is smaller, generally 15mm. Once the cutter ring wears to the limit, if it is not discovered in time, the cutter head is prone to wear, the tunnel excavation radius is reduced, and then Serious consequences such as the shield machine being stuck

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