Shield tunneling machine and water jet combined hob rock breaking mechanism thereof

Abstract

The invention discloses a water jet combined hob rock breaking mechanism, including a cutter disc which is arranged at the front end of a machine body and can feed in the axial direction and rotate inthe circumferential direction, a plurality of layers of hobs arranged on the surface of the cutter disc and distributed in a ring shape, and a jet nozzle arranged on the surface of the cutter disc and between the hobs of the adjacent two layers, and used for cutting a rock face to form several layers of annular cutting slots during the rotation of the cutter disc, and the current depth of the annular cutting seam of each layer is greater than the current cutting depth of the hobs of each layer. According to the water jet combined hob rock breaking mechanism, by use of the annular cutting slots formed by the jet nozzle on the rock surface, the hobs of each layer only needs to overcome the weak shear strength of rocks, rock surface fracture is realized by a shearing failure mode of each layer rock surface ring, the difficulty of tunneling for rocks with high compressive strength is lowered, at the same time, tunneling efficiency is improved and tool wear is reduced. The invention further discloses a shield tunneling machine which has the beneficial effects.

Description

technical field [0001] The invention relates to the technical field of tunneling, in particular to a water jet combined hob rock breaking mechanism. The invention also relates to a shield machine. Background technique [0002] With the development of China's machinery industry, more and more machinery and equipment have been widely used. [0003] There are many types of mechanical equipment. In civil and construction engineering, large-scale engineering equipment is usually required, such as roadheaders, excavators, and gantry cranes. Taking the shield machine as an example, the modern shield machine is a large-scale high-end tunneling equipment that integrates light, mechanics, electricity, and hydraulics. Its working mechanism is composed of a hydraulic system and an electrical system. [0004] The cutting device of the roadheader usually includes a hob and a cutterhead. The hobs evenly arranged on the cutterhead are pressed against the rock mass under the action of prop...

AI Technical Summary

Problems solved by technology

When the uniaxial compressive strength of the rock is high, the propulsion force required is also greater. The hob rolls on the rock surface under the action of huge positive pressure, and breaks the rock by overcoming the limit of the rock’s compressive strength. This is undoubtedly Aggravated tool wear, reduced tool life, and slowed down tunneling efficiency

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