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Cutter friction abrasion testing machine for simulating shield construction conditions, testing cutter and testing method

A friction and wear test, tool technology, applied in the direction of testing wear resistance, measuring devices, instruments, etc., can solve the problems of large size, large test device, high cost, etc., to reduce the test tool, reduce the test cost, and reduce the size of the sample small effect

Inactive Publication Date: 2014-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their shortcomings are: the above test devices focus on the rock-breaking mechanism of the shield cutter, which is not conducive to the study of the wear failure behavior of the shield cutter, and the original intention of the above devices is to study the rock-breaking mechanism of the hob, which is not conducive to Research on cutting soft rock and soil layers by other tools; it is not possible to simulate the working conditions of the shield cutter in the earth pressure balance and mud-water balance mode, and it is not possible to study the wear and failure behavior of the cutter at this time; the above test devices all use commercial finished rollers Knives, their large size and complex structure are not conducive to the measurement of wear loss and the analysis of subsequent wear surface morphology, and are not conducive to the study of the wear failure behavior and mechanism of hob cutter rings; the rock samples required for the test are huge and difficult to obtain. The cost is high, and at the same time the cost of commercial finished hobs is high, resulting in the entire test device being huge and complicated, and the test cost is expensive

Method used

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  • Cutter friction abrasion testing machine for simulating shield construction conditions, testing cutter and testing method
  • Cutter friction abrasion testing machine for simulating shield construction conditions, testing cutter and testing method
  • Cutter friction abrasion testing machine for simulating shield construction conditions, testing cutter and testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Simulate the tool wear conditions during the construction of a full-face hard rock tunneling machine, and study the wear failure behavior of the hob cutter ring.

[0033] Referring to the accompanying drawings, the tool friction and wear test device for simulating shield construction conditions includes hydraulic jacking cylinder 1, mud box 2, lower sample fixture 3, lower sample 4, test tool 5, upper sample fixture 6, mud Box cover plate 7, rotating shaft 8.

[0034] The test tool 5 is a shield hob cutter ring, which is processed into a 3mm×5mm×15mm cuboid by wire cutting, and a 3mm×5mm end face is ground for grinding against the sample under the rock. The size of the positioning hole of the corresponding upper sample fixture is 3mm×5mm. The lower sample is granite with a size of 80mm×80mm×30mm.

[0035] When the tool friction and wear testing machine simulating the construction conditions of shield tunneling is working, the test tool 5 is fixed on the upp...

Embodiment 2

[0036] Example 2: Simulate the tool wear condition during construction of the hybrid shield machine, and study the wear failure behavior of the hob cutter ring.

[0037]The test tool 5 is a shield hob cutter ring, which is processed into a 3mm×5mm×15mm cuboid by wire cutting, and a 3mm×5mm end face is ground for grinding against the sample under the rock. The size of the positioning hole of the corresponding upper sample fixture is 3mm×5mm. The lower sample is sandstone with a size of 80mm×80mm×30mm. The mud composition includes: 15% water, 50% fine sand (diameter less than 3mm) and 20% soil.

[0038] When the tool friction and wear testing machine simulating the construction conditions of shield tunneling is working, the test tool 5 is fixed on the upper sample holder 6 through the test tool positioning hole 9 and the lateral screw, and the lower sample 4 is fixed on the lower sample holder 3 and juxtaposed In the mud box 3, add the above mud to the mud box 3, fix the mud b...

Embodiment 3

[0039] Example 3: Simulate the tool wear condition during construction of the hybrid shield machine, and study the wear failure behavior of the cutting tool.

[0040] The test tool is a cemented carbide rack used on the cutter, which is processed into a 3mm×5mm×15mm cuboid by wire cutting, and a 3mm×5mm end face is ground for grinding against the sample under the rock. The size of the positioning hole of the corresponding upper sample fixture is 3mm×5mm. The lower sample is sandstone with a size of 80mm×80mm×30mm. The mud composition includes: 15% water, 50% fine sand (diameter less than 3mm) and 20% soil.

[0041] When the tool friction and wear testing machine simulating the construction conditions of shield tunneling is working, the test tool 5 is fixed on the upper sample holder 6 through the test tool positioning hole 9 and the lateral screw, and the lower sample 4 is fixed on the lower sample holder 3 and juxtaposed In the mud box 3, add the above mud to the mud box 3,...

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Abstract

The invention provides a cutter friction abrasion testing machine for simulating shield construction conditions, a testing cutter and a testing method. The cutter friction abrasion testing machine comprises a hydraulic pushing oil cylinder and a rotating shaft, which is driven by a rotating motor, wherein a mud box is mounted on the hydraulic pushing oil cylinder; the top of the mud box is open; an upper test sample fixture is mounted below the rotating shaft; the upper test sample fixture is placed in the mud box from the opening at the top of the mud box; a lower test sample fixture corresponding to the upper test sample fixture in position is mounted at the bottom of the mud box; a plurality of testing cutter mounting holes are formed in one surface of the upper test sample fixture opposite to the lower test sample fixture; and the testing cutter mounting holes are uniformly formed in the upper test sample fixture; and the cutter friction abrasion testing machine for simulating the shield construction conditions, provided by the invention, has the advantages of simple structure and low testing cost, is convenient to measure abrasion loss and analyze follow-up abrasion surface appearance and is convenient to study abrasion failure behaviors and mechanisms of hobbing cutter rings.

Description

Technical field: [0001] The invention relates to the technical field of friction and wear testing, in particular to a tool friction and wear testing machine for simulating shield construction conditions, a testing tool and a testing method thereof. Background technique: [0002] Shield construction is widely used in urban subway, railway, highway, municipal, hydropower and other tunnel projects. It has the advantages of small impact on the surrounding environment, high degree of automation, high efficiency, safety and environmental protection. According to different geological conditions, different types of shield machines are used for tunnel excavation. Full-face hard rock tunnel boring machines are mainly used in pure hard rock formations, and earth pressure balance is mainly used in soft rock, soil formations and rock-soil mixed formations. Shield, Slurry Shield and Hybrid Shield. [0003] The cutter is the "teeth" of the shield machine, through which the rock or soil on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/56G01N3/02
Inventor 易丹青王斌陈丽勇聂灿
Owner CENT SOUTH UNIV
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