Front-mix-type abrasive material jet flow continuous feeding apparatus and feeding method

Abstract

The invention provides a front-mix-type abrasive material jet flow continuous feeding apparatus and a feeding method. The feeding apparatus includes a spray nozzle assembly and at least three groups of feeding assemblies. The feeding assemblies are uniformly distributed in the circumference of a cutter head and are mounted thereon. When the cutter head rotates, at least one group of the feeding assembly is located on the upper half part of the cutter head. The feeding method includes the steps of: 1) mounting the feeding assemblies on the cutter head, wherein the feeding assemblies are uniformly distributed and installed in the circumference of the cutter head; 2) rotating the cutter head and supplying high-pressure water to the feeding assembly located on the upper half part of the cutter head; 3) stopping the water supplement to the feeding assemblies which are about to move to the lower half part of the cutter head, and preparing abrasive material supplement; 4) performing abrasive material supplement to the feeding assemblies which are located on the lower half part of the cutter head; 5) stopping the abrasive material supplement to the feeding assemblies which are about to move to the upper half part of the cutter head, and preparing abrasive material slurry supplement; 6) repeating the steps for several time until the tunneling is completed. The apparatus allows continuous feeding, is low in equipment abrasion and has high tunneling efficiency.

Description

technical field [0001] The invention relates to the field of tunnel excavation, in particular to a pre-mixing abrasive jet continuous feeding device and a feeding method. Background technique [0002] In the process of tunnel excavation, the joint action of jet technology and mechanical cutter can greatly improve the efficiency of rock breaking, increase the construction speed, and reduce the construction cost. Existing abrasive jets include front-mixing abrasive jets and post-mixing abrasive jets. The front-mixing abrasive jets use high-pressure water and abrasives to mix to form high-pressure abrasive slurries, and then spray high-pressure abrasive slurries from nozzles. Powerful crushing, cutting and abrasive capabilities. [0003] The key to adopting the pre-mixing abrasive jet is to prepare a uniform high-pressure abrasive slurry, which usually uses a certain volume of high-pressure abrasive tank, and uses gravity to mix the abrasive and high-pressure water evenly unde...

AI Technical Summary

Problems solved by technology

[0003] The key to adopting the pre-mixing abrasive jet is to prepare a uniform high-pressure abrasive slurry, which usually uses a certain volume of high-pressure abrasive tank, and uses gravity to mix the abrasive and high-pressure water evenly under the abrasive tank, but the volume of the abrasive tank is limited. It needs to be shut down to relieve pressure and add materials, and its work efficiency is low

In order to solve the above technical problems, the existing method is to set up multiple high-pressure abrasive tanks in parallel, and use valve switching to ensure that the abrasive tanks are in a continuous working state. However, since the abrasive tanks need to use gravity to feed materials, the existing abrasive tanks usually use vertical Fixed installation arrangement, and under the condition of continuous rotation of the nozzle, the vertically fixed abrasive tank needs to use a rotary joint to introduce high-pressure abrasive slurry into each nozzle, which can easily cause severe wear of the abrasive slurry on the rotary joint under high pressure , resulting in a high failure rate of the rotary joint and a low overall efficiency of the equipment, which seriously restricts the application of the pre-mixing abrasive jet in the field of tunnel excavation

It can be seen that it is difficult to solve the problem of wear of the high-pressure abrasive slurry on the rotary joint under the condition of continuous rotation, no matter whether the volume of the abrasive tank is increased or the multi-tank parallel switching operation is adopted.

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