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Device and method for nondestructive measurement of anchor rod length

A technology of measuring device and anchor rod, applied in the direction of measuring device, electric device, instrument, etc., can solve problems such as implementation difficulties, and achieve the effects of convenient operation, wide practicability, fast and accurate measurement and calculation

Inactive Publication Date: 2011-08-17
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for bolts with a length of several meters to more than ten meters, a particularly high-speed and accurate clock is required, which is difficult to implement

Method used

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  • Device and method for nondestructive measurement of anchor rod length
  • Device and method for nondestructive measurement of anchor rod length
  • Device and method for nondestructive measurement of anchor rod length

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Embodiment Construction

[0020] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0021] figure 1 As shown, the bolt length nondestructive measuring device of the present invention is mainly composed of a display 1, a single-chip microcomputer 2, a measurement frequency signal generator 3, an impedance matching circuit 4, a probe 5, a measured bolt 6, a peak detection circuit 7, and an A / D The converter 8 constitutes. Wherein: the model of the single-chip microcomputer 2 is PIC18F6680, the output end of the single-chip microcomputer 2 is connected with the input end of the measurement frequency signal generator 3, the model of the measurement frequency signal generator 3 is CDCE906, and the output end of the measurement frequency signal generator 3 is connected to the impedance matching circuit The input terminal of 4 is connected, the probe 5 is connected on the impedance matching circuit 4, the output terminal of the impedance matchin...

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Abstract

The invention discloses a device and a method for nondestructive measurement of anchor rod length; the device comprises a single chip, a measurement frequency signal generator, an impedance match circuit, and a probe in contact with an initial end of a measured anchor rod; an output end of the impedance match circuit is connected with an A / D converter through a peak value detection circuit, an output end of the A / D converter is connected with an input end of the single chip; a measurement probe is directly contacted with the initial end of the measured metallic anchor rod to send a test signal; the test signal is sent into the measured anchor rod from the initial end thereof till to a terminal of the measured anchor rod, then is returned to the initial end of the measured anchor rod from the terminal of the measured anchor rod, a returned electric signal is sent back to a measurement instrument through the probe, a frequency node capable of generating a voltage minimum value can be measured by changing an output frequency of the test signal; therefore, the length of the measured anchor rod can be computed; the device can perform online nondestructive measurement on the anchor rod length; and the device is simple in structure, convenient for operation, rapid and accurate in measurement, practical, reliable, small in volume and low in power consumption.

Description

technical field [0001] The invention relates to a method for nondestructively measuring the length of a bolt, in particular to a method for nondestructively measuring the length of an electromagnetic technology suitable for metal bolts. Background technique [0002] Anchor rods are widely used in the reinforcement and support of underground roadways and slope surrounding rocks. If the installation length of the anchor does not meet the design requirements, or the anchor breaks during use, it will have a great impact on the anchoring quality. Therefore, the non-destructive testing of anchor rod length is very necessary. However, the methods currently used for non-destructive testing of bolts, such as ultrasonic method and shock stress wave method, all have coupling problems between vibration waves and bolts, the operation is complicated, and the measurement results often vary from person to person. [0003] The use of electromagnetic technology for non-destructive testing o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/02
Inventor 徐钊郑红党霍羽王婷婷王子剑
Owner CHINA UNIV OF MINING & TECH
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