Device for testing tunneling wear coefficient of complex formation shield cutter

A technology of shield cutting tools and wear coefficient, which is applied in the direction of testing wear resistance, etc., and can solve problems such as property differences and inapplicability

Active Publication Date: 2015-09-02
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since 90% of the urban shield tunnels in our country pass through the earth-rock mixed stratum, the existing foreign tests for testing the wearability of rocks are not applicable in our country. There is a big difference in the nature of foreign soil layers (mainly plastic to hard plastic cohesive...

Method used

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  • Device for testing tunneling wear coefficient of complex formation shield cutter
  • Device for testing tunneling wear coefficient of complex formation shield cutter
  • Device for testing tunneling wear coefficient of complex formation shield cutter

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Experimental program
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Embodiment

[0034] The tool driving wear coefficient δ (mm / km) of the device test of the present invention is defined as the length change (mm) when the test needle travel distance is 1km;

[0035] The conversion relationship between the steel needle mass loss m (mg) and the length change h (mm) tested by the device of the present invention is as follows:

[0036] m = ρ · h · πd 2 4

[0037] Among them, ρ is the density of the test specimen, and the steel can be taken as 7.85g / cm 3 , the mass loss of the steel needle measured by the test is m (mg), d is the diameter of the test steel needle, and the test piece is 1 cm, then its length change h (mm) is:

[0038] h = 4 m πd 2 · ρ

[00...

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Abstract

The invention relates to a device for testing a tunneling wear coefficient of a complex formation shield cutter. The device is composed of a cabinet, an instrument platform, a driving motor, an abrasive disk, a loading assembly, a feeding assembly, a soil suction assembly and an electric control assembly; the instrument platform is located in the cabinet; the abrasive disk, the loading assembly and the electric control assembly are placed on the instrument platform; the driving motor is arranged under the instrument platform and drives the abrasive disc to rotate; the feeding assembly is arranged above the abrasive disc; the soil suction assembly is arranged at the bottom. Compared with the prior art, the abrasive disk of the device is a dual-track abrasive disk and four cutter test steel needles can be simultaneously tested; the test instrument is designed with lever-type loading and is capable of realizing simultaneous application of 4 variable loads, and therefore, the tunneling wear coefficient delta (mm/km) of a shield cutter can be accurately tested under real working conditions and a basic parameter can be provided for the design of the cutter of large shield equipment in underground project construction.

Description

technical field [0001] The invention belongs to the field of special test instruments for civil engineering, and relates to a test device for the wear coefficient of shield tunneling tools in complex formations. Background technique [0002] When the shield machine is excavating in the sand-bearing layer, round gravel layer, pebble layer and other earth-rock mixed strata, the cutting tool of the shield machine is easy to wear due to the friction and collision between the cutter head and the cutter of the shield machine and the soil particles. Components are damaged, and excessive tool wear often occurs, resulting in serious equipment failure accidents such as shield machine shutdown and bearing damage. At present, the methods and devices for measuring shield tool wear in the world can be divided into two wear test devices suitable for hard rock and soft soil according to the type of cutting soil. Since 90% of the urban shield tunnels in our country pass through the soil-roc...

Claims

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Application Information

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IPC IPC(8): G01N3/56
Inventor 胡群芳李敏王飞付聪
Owner TONGJI UNIV
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