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Device for sensing elastic stress-wave of coal rock mass

A technology of elastic stress, sensing device, applied in the direction of measuring device, using electrical device, measuring ultrasonic/sonic/infrasonic waves, etc.

Inactive Publication Date: 2010-03-03
邹德蕴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are almost no sensing devices for precursor vibration signals of coal and rock mass. In view of this situation, there is a great need for a coal and rock mass elastic stress wave sensing device in the field of mining engineering.

Method used

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  • Device for sensing elastic stress-wave of coal rock mass
  • Device for sensing elastic stress-wave of coal rock mass

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Experimental program
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Effect test

Embodiment Construction

[0012] Such as figure 1 and figure 2 In the illustrated embodiment, an inverted cone 8 is connected to the lower end of a vertical metal explosion-proof housing 4. When connecting, the connection is made through the internal thread of the stable balance ring 7, and an intrinsically safe metal is installed on the top of the metal explosion-proof housing 4. Type circuit board 2, and an OP07 type signal amplifying chip 10 is arranged on the intrinsically safe circuit board 2. A crystal piezoelectric sheet 5 is suspended in the middle of the intrinsically safe circuit board 2, and the crystal piezoelectric sheet 5 is electrically connected to the input end of the OP07 signal amplifying chip 10, which can generate an amplified electrical signal corresponding to the amplitude when it vibrates. A metal cover 3 is connected to the top of the metal explosion-proof housing 4, and a cable hole 1 is provided on the metal cover 3. The piezoelectric signal is output to the subsequent record...

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Abstract

The invention discloses a device for sensing elastic stress-wave of a coal rock mass. An inverted cone is connected to the lower end of a vertical cylindrical shell, a circuit board is arranged at thetop end of the cylindrical shell, and a signal amplifying circuit is arranged on the circuit board; a wafer piezoelectric sheet is suspended in the middle of the circuit board, and the wafer piezoelectric sheet can generate an electric signal corresponding to the amplitude of the elastic stress-wave when vibrating. A seal cover is connected at the top of the cylindrical shell, the seal cover is provided with a cable hole, and a piezoelectric signal is amplified by the signal amplifying circuit and output to a subsequent recording apparatus through a cable. The invention solves the monitoringproblem of vibration precursor signal of the coal rock mass, and predicts disasters of rock burst, coal burst, gas burst, and the like through correct detection.

Description

Technical field [0001] The invention relates to a vibration sensing device. Background technique [0002] Underground mining engineering is often under the influence of strong in-situ stress field. The superposition of regenerative stress and original in-situ stress field generated in the mining process of coal and rock mass destroys the stress balance of coal and rock mass, and stress transfer phenomenon occurs, which induces deep coal in surrounding rock. The rock mass releases elastic energy to the surrounding rock (excavation space), transfers energy through the coal and rock medium in the form of elastic stress waves, and causes the coal and rock mass to vibrate. In severe cases, severe impact damage will occur, such as rock bursts and coal. With gas outburst, it causes catastrophic casualties and losses to personnel and production. Because the energy released by coal and rock masses has significant randomness and dynamics, it is impossible to use experience alone to judge ...

Claims

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Application Information

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IPC IPC(8): G01H11/08G01V1/00
Inventor 邹德蕴段伟刘志刚时慧刘义磊
Owner 邹德蕴