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A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect

A magnetostrictive, non-destructive testing technology, applied in processing the response signal of detection, using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, etc. Problems such as low energy conversion efficiency, to achieve the effect of simple installation and good effect

Inactive Publication Date: 2016-10-26
SHIJIAZHUANG TIEDAO UNIV
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Problems solved by technology

[0005] But the limitation of the above-mentioned prior art is that the core component ultrasonic transducer (that is, the sensor part) of the detection device made by this principle has low energy conversion efficiency, thereby causing the signal-to-noise ratio of the ultrasonic signal to be low. The accuracy of the test results has a certain influence

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  • A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect
  • A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect
  • A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect

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Embodiment Construction

[0065] In order to make the purpose of the present invention, technical solutions and advantages clearer, the following combination Figure 1 to Figure 7 The present invention is clearly and completely described with reference to specific examples.

[0066] Step 1. Set up the detection device:

[0067] Such as figure 1 As shown, for the bolt anchorage system, 2, 4 or 8 electromagnets 1 are arranged around the outer end of the bolt 6, and the 2, 4 or 8 electromagnets 1 are connected with the bolt 6 is that the central axis is evenly and symmetrically distributed, and the high-frequency AC coil 2 is arranged in the bias magnetic field formed by the 2, 4 or 8 electromagnets 1 to form a self-excited and self-receiving self-comparison sensor;

[0068] Step 2. The high-frequency AC coil 2 provides an excitation signal through the signal excitation device. Under the action of the external bias magnetic field formed by the electromagnet 1, a magnetostrictive effect occurs inside the...

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Abstract

A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect is disclosed and belongs to the field of nondestructive testing. Electromagnets are adopted to form an external bias magnetic field. A high-frequency alternating-current coil is prepared into a self-exciting and self-receiving self-closed sensor. In the bias magnetic field environment, an excitation signal is provided for the high-frequency coil, the magnetostrictive effect occurs in a rock bolt, excited ultrasonic guided waves propagate in the rock bolt, and echo information is received by utilizing an inverse magnetostrictive effect and transferred to a computer. By utilizing correlative fusion, deconvolution and other signal processing methods, reflection time recognition is achieved, and rock bolt related geometrical parameters and a primary defect status are acquired, thus achieving rock bolt quality evaluation. The method has advantages of a high detection efficiency, good detection precision, no need of a coupling agent, and the like and is suitable for nondestructive testing of rock bolts in complex engineering environments.

Description

technical field [0001] The invention relates to a device and method for detecting bolts in mine engineering, geotechnical engineering and underground engineering, in particular to a self-comparison nondestructive detection method for bolts based on magnetostrictive effect, which belongs to the field of nondestructive detection. Background technique [0002] In the prior art, methods for detecting bolts mainly include drawing test, core method, acoustic wave method (including stress wave) and the like. [0003] The drawing test and the core method are all destructive testing methods. Although they are traditional testing methods, they are labor-intensive and time-consuming to use, and the number of sampling samples is very limited. It is inevitable that they will be partial and cannot become routine testing method. [0004] The electromagnetic ultrasonic testing technology based on the magnetostrictive effect is a new type of non-destructive testing technology. It has the ch...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/46G01N29/50
CPCG01N29/07G01N29/46G01N29/50G01N2291/011G01N2291/023G01N2291/0289
Inventor 孙晓云陈建锋程久龙
Owner SHIJIAZHUANG TIEDAO UNIV
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