Wear prediction method for shield tunneling hob

A tool wear and prediction method technology, which is applied in the direction of earth drilling, mining equipment, instruments, etc., can solve the problems of tool wear and tear, frequent opening, etc.

Inactive Publication Date: 2020-04-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for predicting the tool wear of the shield hob, which can pre

Method used

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  • Wear prediction method for shield tunneling hob
  • Wear prediction method for shield tunneling hob
  • Wear prediction method for shield tunneling hob

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Embodiment

[0090] The main forms of hob wear include plastic removal, brittle fracture, adhesive wear and fatigue wear. In this embodiment, a hob wear prediction model including four different wear mechanisms is established by combining specific hob parameters and geological condition parameters.

[0091] The calculation method of hob wear based on plastic removal mechanism is: figure 1 It is a simplified model of abrasive wear based on the theory of micro-cutting. This model assumes that the abrasive particles are hard particle cones plowing grooves in softer materials, and the wear process is regarded as the normal load pressed into the micro-cutting and sliding of the friction surface. furrow shear action. Among them, the projected area A of the pressed-in part of a single cone is:

[0092] A=πr 2 (1)

[0093] In the formula, r is the radius of the cone base.

[0094] If the normal load on each abrasive particle is W, assuming that there are n cones on the contact surface, and th...

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Abstract

The invention discloses a wear prediction method for a shield tunneling hob. The wear prediction method for the shield tunneling hob comprises the following steps that a unit displacement wear loss caused by a plastic removal mechanism, a unit displacement wear loss caused by a brittle fracture mechanism, a unit displacement wear loss caused by adhesive wear, a unit displacement wear loss caused by fatigue wear, a rock breaking arc length generated when a point on the front side of the hob rotates by one circle, a spatial rock breaking arc length generated when a point on the side face of thehob rotates by one circle, a normal cutting force of the hob, and a horizontal force borne by the hob are acquired; the radial wear and wear size of the front side of a hob ring caused when the hob rotates by one circle are worked out; the wear loss and wear size of the side face of the hob ring caused when the hob rotates by one circle are worked out; the four wear losses are multiplied by corresponding fitting coefficients, and the products are added to obtain the wear size of the front side and the wear size of the hob ring; and a wear prediction model is generated, and the wear is predicted. By the adoption of the wear prediction method, the service life of the shield tunneling hob can be predicted, the prediction precision can be improved, and the problems of severe wear of the hob and frequency opening of a bin are solved.

Description

technical field [0001] The invention relates to shield tunnel construction technology, in particular to a method for predicting wear of shield hob cutters. Background technique [0002] With the rapid expansion of population and the acceleration of urbanization, the problems of poor land resources and ground traffic congestion have become more and more serious. Public facilities, roads and bridges have covered a large area of ​​ground space. Therefore, the development of underground space and the rapid construction of urban subways are crucial to urban construction. very urgent. Due to its fast construction speed, strong adaptability to complex strata, and less interference to the surrounding environment, shield tunneling has been rapidly developed and widely used, and has increasingly become the preferred construction method for urban subways. [0003] During the construction process of the shield method, the hob installed on the cutter head is the main tool for excavating...

Claims

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Application Information

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IPC IPC(8): E21D9/08E21F17/00E21F17/18G06Q50/02
CPCE21D9/08E21F17/00E21F17/18G06Q50/02
Inventor 张军伟张骁李雪郭亮纪佑军
Owner SOUTHWEST PETROLEUM UNIV
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