CN108828062B - Eddy current detection method for spirally wound long metal tube - Google Patents
Eddy current detection method for spirally wound long metal tube Download PDFInfo
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- CN108828062B CN108828062B CN201810904401.8A CN201810904401A CN108828062B CN 108828062 B CN108828062 B CN 108828062B CN 201810904401 A CN201810904401 A CN 201810904401A CN 108828062 B CN108828062 B CN 108828062B
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- long metal
- spirally wound
- wound long
- eddy current
- metal pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
Abstract
The invention discloses a vortex detection method for a spirally wound long metal pipe, which adopts a method that compressed air is blown into an inlet end and gas is sucked out of an outlet end.
Description
Technical Field
The invention relates to a nondestructive testing method, in particular to a spiral winding long metal tube eddy current testing method.
Background
In the industry, there are many elongated metal tubes, particularly helically wound products, that need to be inspected periodically (e.g., nuclear industry systems). Among the existing nondestructive testing means, the eddy current method is the best practical engineering means. However, because the current eddy current probe needs to adopt a mode similar to a nylon sleeve, the eddy current probe is inserted into a pipeline by utilizing certain rigidity, and for a metal pipe which is in service and has a long and thin spiral winding length of more than ten meters, the eddy current probe can only push a few meters, and the detection of the whole pipe cannot be completed. Has been a problem in this field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vortex detection method for a spirally wound long metal pipe, which adopts a method that compressed air is blown into an inlet end and gas is sucked out of an outlet end.
The technical scheme adopted by the invention for solving the technical problems is as follows: a spiral winding long metal tube eddy current testing method is characterized in that: comprises the following steps of (a) carrying out,
a. the piston is connected with the multi-section spherical eddy current probe through a flexible lead wire, and the multi-section spherical eddy current probe is electrically connected with the eddy current detector through a flexible cable; the multi-section spherical eddy current probe is formed by connecting a plurality of spherical eddy current probes in series;
b. the method comprises the steps that a piston is plugged into an inlet of a spirally wound long metal tube, compressed air is blown into the inlet of the spirally wound long metal tube by a blowing pump, air is sucked out of an outlet of the spirally wound long metal tube by an air sucking pump, air negative pressure is formed in the front and the back of the piston in the spirally wound long metal tube, the piston moves from the inlet of the spirally wound long metal tube to the outlet of the spirally wound long metal tube, and the piston is taken out of the spirally wound long metal tube;
c. pulling the piston, and leading the multi-section spherical eddy current probe to enter from the inlet of the spirally wound long metal pipe by the piston through the flexible lead;
d. and continuously pulling the piston, and simultaneously blowing compressed air inwards from the inlet of the spirally wound long metal pipe by using a blowing pump, so that the spirally wound long metal pipe is scanned while the multi-section spherical vortex probe moves in the spirally wound long metal pipe, and after the multi-section spherical vortex probe comes out from the outlet of the spirally wound long metal pipe, the detection of the spirally wound long metal pipe is finished.
And in the step d, the piston is continuously pulled, meanwhile, compressed air is blown inwards from the inlet of the spirally wound long metal pipe by the aid of the air blowing pump, air is sucked outwards from the outlet of the spirally wound long metal pipe by the air suction pump, air negative pressure is formed around the multi-section spherical vortex probe in the spirally wound long metal pipe, the spirally wound long metal pipe is scanned while the multi-section spherical vortex probe moves in the spirally wound long metal pipe, and after the multi-section spherical vortex probe comes out from the outlet of the spirally wound long metal pipe, detection of the spirally wound long metal pipe is finished.
The vortex detection method for the spirally wound long metal pipe has the advantages that compressed air is blown into the inlet end, and air is sucked out of the outlet end, firstly, the piston with the flexible lead wire is blown into the pipe and taken out from the other end, a plurality of sections of spherical vortex probes (similar to Buddha bead strings) are tied, and the vortex detection of the in-service long and thin spirally wound metal pipe is completed in a blowing and pulling mode.
The present invention will be described in further detail with reference to examples, but the eddy current testing method for a spirally wound long metal tube according to the present invention is not limited to the examples.
Drawings
The invention will be further elucidated with reference to an embodiment in the drawing.
Fig. 1 is a schematic diagram of a method according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a method according to a second embodiment of the present invention.
In the figure, 1, a piston, 2, a flexible lead, 3, a multi-section spherical eddy current probe, 4, a flexible cable, 5, an eddy current detector, 6, a blowing pump, 7, an air suction pump and 8, a long metal pipe is spirally wound.
Detailed Description
In an embodiment, as shown in fig. 1, a method for eddy current testing of a spirally wound long metal tube is characterized in that: comprises the following steps of (a) carrying out,
a. the piston 1 is connected with a multi-section spherical eddy current probe 3 through a flexible lead 2, and the multi-section spherical eddy current probe 3 is electrically connected with an eddy current detector 5 through a flexible cable 4; the multi-section spherical eddy current probe 3 is formed by connecting a plurality of spherical eddy current probes in series;
b. the method comprises the steps that a piston 1 is plugged into an inlet of a spirally wound long metal tube 8, compressed air is blown inwards into the inlet of the spirally wound long metal tube 8 through a blowing pump 6, air is sucked outwards through an outlet of the spirally wound long metal tube 8 through an air suction pump 7, air negative pressure is formed in the front and back of the piston 1 in the spirally wound long metal tube 8, the piston 1 moves from the inlet of the spirally wound long metal tube 8 to the outlet of the spirally wound long metal tube 8, and the piston 1 is taken out of the spirally wound long metal tube 8;
c. pulling the piston 1, wherein the piston 1 pulls the multi-section spherical eddy current probe 3 through the flexible lead 2 to enter from the inlet of the spirally wound long metal tube 8;
d. continuing to stimulate the piston 1, simultaneously adopting the air-blowing pump 6 to blow in compressed air at the inlet of the spirally-wound long metal tube 8 inwards, so that the spirally-wound long metal tube 8 is scanned while the multi-section spherical eddy current probe 3 moves in the spirally-wound long metal tube 8, and after the multi-section spherical eddy current probe 3 comes out from the outlet of the spirally-wound long metal tube 8, the detection of the spirally-wound long metal tube 8 is completed.
In the second embodiment, as shown in fig. 2, in step d, the piston 1 is continuously pulled, and meanwhile, compressed air is blown inwards from the inlet of the spirally wound long metal tube 8 by the blowing pump 6, and meanwhile, the air suction pump 7 sucks air outwards from the outlet of the spirally wound long metal tube 8, so that air negative pressure is formed around the multiple sections of spherical eddy current probes 3 in the spirally wound long metal tube 8, and the spirally wound long metal tube 8 is scanned while the multiple sections of spherical eddy current probes 3 move in the spirally wound long metal tube 8, and after the multiple sections of spherical eddy current probes 3 come out from the outlet of the spirally wound long metal tube 8, the detection of the spirally wound long metal tube 8 is completed.
The above embodiments are only used to further illustrate the eddy current testing method of the spirally wound long metal tube of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. A spiral winding long metal tube eddy current testing method is characterized in that: comprises the following steps of (a) carrying out,
a. the piston is connected with the multi-section spherical eddy current probe through a flexible lead wire, and the multi-section spherical eddy current probe is electrically connected with the eddy current detector through a flexible cable; the multi-section spherical eddy current probe is formed by connecting a plurality of spherical eddy current probes in series;
b. the method comprises the steps that a piston is plugged into an inlet of a spirally wound long metal tube, compressed air is blown into the inlet of the spirally wound long metal tube by a blowing pump, air is sucked out of an outlet of the spirally wound long metal tube by an air sucking pump, air negative pressure is formed in the front and the back of the piston in the spirally wound long metal tube, the piston moves from the inlet of the spirally wound long metal tube to the outlet of the spirally wound long metal tube, and the piston is taken out of the spirally wound long metal tube;
c. pulling the piston, and leading the multi-section spherical eddy current probe to enter from the inlet of the spirally wound long metal pipe by the piston through the flexible lead;
d. and continuously pulling the piston, and simultaneously blowing compressed air inwards from the inlet of the spirally wound long metal pipe by using a blowing pump, so that the spirally wound long metal pipe is scanned while the multi-section spherical vortex probe moves in the spirally wound long metal pipe, and after the multi-section spherical vortex probe comes out from the outlet of the spirally wound long metal pipe, the detection of the spirally wound long metal pipe is finished.
2. The eddy current testing method for the spirally wound long metal tube as claimed in claim 1, wherein: after the step a, the step b and the step c, in the step d, the piston is continuously pulled, meanwhile, compressed air is blown inwards from the inlet of the spirally wound long metal pipe by the blowing pump, meanwhile, air is sucked outwards from the outlet of the spirally wound long metal pipe by the suction pump, so that air negative pressure is formed in the front and back of the multi-section spherical vortex probe in the spirally wound long metal pipe, the spirally wound long metal pipe is scanned while the multi-section spherical vortex probe moves in the spirally wound long metal pipe, and after the multi-section spherical vortex probe comes out from the outlet of the spirally wound long metal pipe, the detection of the spirally wound long metal pipe is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810904401.8A CN108828062B (en) | 2018-08-09 | 2018-08-09 | Eddy current detection method for spirally wound long metal tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810904401.8A CN108828062B (en) | 2018-08-09 | 2018-08-09 | Eddy current detection method for spirally wound long metal tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108828062A CN108828062A (en) | 2018-11-16 |
| CN108828062B true CN108828062B (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810904401.8A Active CN108828062B (en) | 2018-08-09 | 2018-08-09 | Eddy current detection method for spirally wound long metal tube |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232388A (en) * | 1975-09-05 | 1977-03-11 | Mitsubishi Heavy Ind Ltd | Wireless type eddy current flaw detection method |
| JPH0758284B2 (en) * | 1987-02-03 | 1995-06-21 | 三菱重工業株式会社 | Pipe insertion method |
| WO2005018067A1 (en) * | 2003-08-13 | 2005-02-24 | John Michael Holtzhausen | A conduit threading device and method |
| JP2005308677A (en) * | 2004-04-26 | 2005-11-04 | Hitachi Plant Eng & Constr Co Ltd | Inspection probe insertion device and method |
| KR100843875B1 (en) * | 2005-11-29 | 2008-07-04 | 주식회사 포스코 | Device for Detecting the Surface Flaws of Air Guide Type |
| CN103207236B (en) * | 2012-01-12 | 2015-03-04 | 清华大学 | Inspection equipment used for spiral tube heat exchanger or steam generator |
| CN203658310U (en) * | 2013-12-05 | 2014-06-18 | 核动力运行研究所 | Vortex detection probe of spiral pipe |
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2018
- 2018-08-09 CN CN201810904401.8A patent/CN108828062B/en active Active
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| CN108828062A (en) | 2018-11-16 |
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