Hob height adjustment methods based on gaskets and positioning blocks

Abstract

The invention provides hob height adjustment methods based on gaskets and positioning blocks, belongs to the field of a cutter and cutter head structure design of a shield tunneling machine, and particularly relates to two hob height adjustable methods for a combined type cutter. The methods adopt two cutter head structure forms for adjusting the gaskets and the positioning blocks; the cutter head structure form based on the gaskets realizes hob height adjustment by adding the gaskets with different thickness into the cutter head structure; and the cutter head structure form based on the positioning blocks realizes the hob height adjustment by changing the positioning blocks with different sizes. Through hob height adjustment, working performance of a hob and a scraper can be greatly improved, simultaneously, and by virtue of a reasonable height difference, the reduction of the cutter life caused by abnormal damage to the cutter can be prevented; and if the uniaxial compressive strength change of racks at a drivage road section is larger, the drivage efficiency of the cutter head of the shield tunneling machine can be substantially improved by means of the reasonable height difference between the hob and the scraper, and accordingly, certain economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of structural design of a shield machine cutterhead and cutter seat, and in particular relates to two methods for adjusting the height of a compound cutterhead hob. Background technique [0002] The hob is a component that is in direct contact with the ground in front of the shield machine during excavation, and its related performance directly determines the efficiency of construction. The composite shield machine is suitable for terrains with complex geological conditions. The mechanical properties of the rock and soil in front of the shield machine are changing rapidly when the shield machine is working. After the start of excavation, the height difference between hob and scraper cannot be changed. However, the fixed height difference during the excavation process is far from being able to adapt to complex and changeable geological conditions, which not only greatly reduces the efficiency of shield tunneling, but ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defects of existing cutter head structure design, and invents two methods for hob height adjustment based on spacers and positioning blocks: 1. Based on spacer structure, by adding or moving Remove the shim to change the hob extension height; 2. Based on the positioning block structure of the tool holder, the effect of changing the hob extension height is achieved by replacing the positioning block with different lengths and widths, and establish the size of the shim and positioning block, Model formulas of tunneling geological conditions and relative parameters of cutter head and hob

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