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Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof

A flaw detection device and metal tube technology, which can be used in measurement devices, analysis materials, material magnetic variables, etc., can solve problems such as toxicity, low excitation frequency, and corrosion, and achieve the effects of eliminating complex circuit structures, eliminating noise, and reducing costs.

Inactive Publication Date: 2005-02-23
林俊明
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the brush coupling mechanism is noisy and the speed is low; the sealing degree of the saturated saline coupling mechanism and mercury coupling mechanism is not easy to guarantee and is corrosive or toxic; the capacitance coupling mechanism is only a few hundred kilohertz due to the eddy current excitation frequency, Low, the capacitive coupling mechanism is not easy to manufacture; the resolver coupling mechanism requires high machining accuracy and high cost due to the rotation noise
For the occasions where the feeding speed of metal pipes, rods, and wires is very high, it is difficult to use the existing coupling mechanism to produce a rotary eddy current testing device that meets the needs of online testing and uses a point-type eddy current testing probe.

Method used

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  • Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof
  • Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof
  • Rapid-speed metal piping, bar and wire stock on-line defect detecting method and detector thereof

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Embodiment Construction

[0018] Please refer to FIG. 1 for the structure of an embodiment of the high-speed metal tube, rod, and wire online flaw detection device of the present invention. The on-line flaw detection device has a frame 8 fixed on the ground, the frame 8 is hollow inside, and a pair of bearings 5 ​​are respectively installed on both sides of the waist, and the hollow rotating mechanism main shaft 9 is fixed through the two pairs of bearings 5 ​​. The front end inside the main shaft 9 is provided with a pair of centering sleeves 2, and the rear end is provided with an introduction sleeve 10; metal pipes, rods, and wires 1 moving linearly at high speed enter the interior of the main shaft 9 from the center hole of the introduction sleeve 10, and are centered from the two centering sleeves. The central hole of cover 2 passes through and leads to the outside of main shaft 9 . The two centering sleeves 2 and the guide sleeve 10 keep the section of the metal pipe, rod, and wire 1 inside the m...

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Abstract

A method and device for on-line crack detection of metal pipe, bar and wire rod in high speed includes installing vortex detecting mechanism formed by point detection probe, control processor, alarm signal annoucer and battery on a rotating mechanism in high-speed rotation; detecting axial slowly varying defect and annoucing relevant alarm signal by vortex detecting mechanism in high speed as feeding metal pipe bar and wire rod in along axial move.

Description

Technical field [0001] The invention relates to a method and device for testing material defects by using eddy current, in particular to a method and device for testing defects of metal tubes, rods and wires fed at high speed by using eddy current. Background technique [0002] In industrial production, electromagnetic eddy current non-destructive testing technology is mainly used to test the defects of small-diameter metal pipes, rods and wires. For example, for the inspection of copper pipes (coils) used in refrigerators and air-conditioning condensers, due to the faster and faster production speed, it is reported that the highest production speed can reach 550 m / min. Eddy current detectors for moving coil sensors. It can detect mutation defects of metal pipes, rods and wires with a passing speed of 780 m / min online. In order to reduce costs and improve efficiency, the wall thickness of the condenser tube is getting thinner and thinner, and the internal thread process is...

Claims

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Application Information

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IPC IPC(8): G01N27/9093
Inventor 林俊明
Owner 林俊明
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