CN108941357B - Steel pipe weld joint identification and positioning method based on leakage magnetic field - Google Patents
Steel pipe weld joint identification and positioning method based on leakage magnetic field Download PDFInfo
- Publication number
- CN108941357B CN108941357B CN201810598303.6A CN201810598303A CN108941357B CN 108941357 B CN108941357 B CN 108941357B CN 201810598303 A CN201810598303 A CN 201810598303A CN 108941357 B CN108941357 B CN 108941357B
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- magnetic
- magnetic field
- positioning
- leakage magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/18—Advancing work in relation to the stroke of the die or tool by means in pneumatic or magnetic engagement with the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
Abstract
The invention discloses a method for identifying and positioning a steel pipe weld based on a leakage magnetic field, which is characterized by comprising the following steps of: the magnetic sensor comprises two permanent magnets, a magnetic yoke, two magnetic conduction blocks for converging magnetic induction lines, a magnetic sensor arranged in the middle of the magnetic conduction blocks and right above a steel pipe, a filter, an amplifier and a controller. The permanent magnet, the magnet yoke and the magnetic conduction block form a magnetization loop. The steel pipe is placed between the two magnetic conduction blocks, the steel pipe can be magnetized, a leakage magnetic field is formed right above a welding seam, the position of the magnetic sensor right above the steel pipe is fixed and is kept still, the steel pipe is rotated, when the welding seam is located right below the magnetic sensor, the magnetic sensor picks up a leakage magnetic signal, the position information of the welding seam is transmitted to the controller through the filter and the amplifier, and then the identification and the positioning of the welding seam are achieved.
Description
Technical Field
The invention relates to the technical field of steel pipe processing, in particular to a method for identifying and positioning a steel pipe weld joint based on a leakage magnetic field, which can realize accurate positioning of the weld joint of a straight steel pipe.
Background
The straight seam steel pipe is a steel pipe with a welding seam parallel to the longitudinal direction of the steel pipe, can be rapidly developed due to simple production process, high production efficiency and low production cost, is widely applied to construction in the aspects of tap water industry, petrochemical industry and the like at present, and plays a very important role in airplanes and engines thereof.
In the use process of the straight seam steel pipe, the straight seam steel pipe is often required to be bent into a required shape firstly. In the pipe bending process, if the position of the welding seam is positioned at the side of the steel pipe with concentrated stress, the welding seam is easy to crack, and the produced product can not meet the use requirement, so the welding seam identification and positioning of the steel pipe are needed before the straight seam steel pipe is bent. For improving the automation degree of welding seam location, patent 201610000874.6 discloses a steel pipe welding seam discernment positioner, and the device can the automatic transportation steel pipe through set up feed mechanism on the workstation, and feed mechanism one side sets up positioning mechanism ability automatic identification welding seam, and when the welding seam reachd the assigned position, the shut down to realize the location of welding seam, simple structure, degree of automation is high. However, the main problem existing in the mode is that the sensitivity of the sensor is not high enough, the condition that the position of the welding seam can be found only through missed detection or multiple detections exists, and the efficiency is low.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for identifying and positioning a weld of a steel pipe based on a leakage magnetic field, which can realize rapid identification and positioning of the weld and make preparation for bending of a straight-seam steel pipe.
The invention provides a method for identifying and positioning a steel pipe weld based on a leakage magnetic field, which comprises the following steps: the magnetic sensor is fixed on the surface of the steel pipe, the position of the magnetic sensor is kept still, and the magnetic sensor is used for a filter, an amplifier and a controller for signal processing.
The realization mechanism of the device is that the permanent magnet, the magnet yoke and the magnetic conduction block form a magnetization loop. The steel pipe is placed between the two magnetic conduction blocks, the steel pipe can be magnetized, a leakage magnetic field is formed right above a welding seam, the position of the magnetic sensor right above the steel pipe is fixed and is kept still, the steel pipe is rotated, when the welding seam is located right below the magnetic sensor, the magnetic sensor picks up a leakage magnetic signal, the position information of the welding seam is transmitted to the controller through the filter and the amplifier, and then the identification and the positioning of the welding seam are achieved.
In the above technical scheme, the number of the permanent magnets is not less than 2 and is an even number. The permanent magnet is preferably a permanent magnet with residual magnetic flux density of 1.0-1.4T.
In above-mentioned technical scheme, interval between the magnetic conduction piece is not more than 20mm, and the diameter of steel pipe is not big 20mm, and the steel pipe should be located the positive centre of magnetic conduction piece and be not more than 1mm with the interval of magnetic conduction piece.
In the technical scheme, the distance between the outer surface of the steel pipe and the magnetic yoke is not less than 10 mm.
In the technical scheme, the distance between the magnetic sensor and the surface of the steel pipe is not more than 1 mm.
The method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field has the following outstanding advantages: the weld joint identification and positioning of the straight seam steel pipe can be realized quickly and accurately.
Drawings
Fig. 1 is a structural schematic diagram 1 of a method for identifying and positioning a steel pipe weld based on a leakage magnetic field.
Fig. 2 is a structural schematic diagram 2 of a method for identifying and positioning a steel pipe weld based on a leakage magnetic field.
FIG. 3 is a schematic diagram of a method for identifying and positioning a steel pipe weld based on a leakage magnetic field.
The reference numerals in the figures represent objects which are respectively: 1-a magnetic yoke; 2-a permanent magnet; 3-a magnetic conduction block; 4-a steel pipe; 5-welding a seam; 6-a magnetic sensor; 7-a magnetizing loop; 8-a filter; 9-an amplifier; 10-a controller; 11-leakage magnetic field.
Detailed Description
The following provides a specific embodiment of the invention with reference to the accompanying drawings, and further describes a method for identifying and positioning a steel pipe weld based on a leakage magnetic field according to the specific embodiment of the invention. It should be particularly noted that the embodiments of the present invention are not limited to the forms described in the examples.
Directional phrases used in the following detailed description, such as: up, down, left, right, front, rear, etc., are directions with reference to the drawings only. Accordingly, the directional terminology is used for the purpose of describing the invention only and is not intended to be limiting.
The structural schematic diagram of the method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field in the embodiment is shown in fig. 1 and 2, and the method comprises the following steps: the magnetic yoke comprises a magnetic yoke 1, a permanent magnet 2, a magnetic conduction block 3 for gathering magnetic induction lines, a steel pipe 4 and a magnetic sensor 6 arranged right above the steel pipe.
The invention is adopted to identify and position the weld of the steel pipe, the working principle of the invention is shown in figure 3, and two permanent magnets 2, a magnet yoke 1 and a magnetic conduction block 3 form a magnetization loop 7. The steel pipe 4 is placed between the two magnetic conduction blocks 3, the steel pipe 4 can be magnetized, a leakage magnetic field 11 is formed right above a welding seam, the magnetic sensor 6 is fixed to be fixed at the position right above the steel pipe, the steel pipe 4 is rotated, when the welding seam 5 is located right below the magnetic sensor 6, the magnetic sensor picks up a leakage magnetic signal, the leakage magnetic signal passes through the filter 8 and the amplifier 9, position information of the welding seam is transmitted to the controller 10, and then the welding seam is identified and positioned.
Claims (5)
1. A method for identifying and positioning a steel pipe weld based on a leakage magnetic field is characterized by comprising the following steps: the welding line detection device comprises a magnetic yoke (1), two permanent magnets (2), two magnetic conduction blocks (3) and a magnetic sensor (6), wherein a magnetization loop is formed between the permanent magnets and the magnetic conduction blocks, a steel pipe (4) is placed between the magnetic conduction blocks to be magnetized, a leakage magnetic field (11) is formed at the position of a welding line, the magnetic sensor is fixed between the magnetic conduction blocks, the steel pipe is rotated right above the steel pipe, when the welding line is positioned right below the magnetic sensor, the magnetic sensor picks up a leakage magnetic field signal, and the position information of the welding line is transmitted to a controller (10) through a filter (8) and an amplifier (9);
wherein the magnetic conduction block is a cylinder with a trapezoidal cross section; the diameter of the steel pipe to be detected is not more than 20 mm;
the residual magnetic flux density of the permanent magnet is 1.0-1.4T;
the distance between the outer surface of the steel pipe and the magnetic yoke is not less than 10 mm;
the magnetic sensor is positioned right above the steel pipe, keeps the position unchanged, and has a distance not more than 1mm with the steel pipe.
2. The method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field according to claim 1, wherein the method comprises the following steps: the number of the permanent magnets is not less than 2 and is an even number, and the number of the permanent magnets at the two ends of the magnet yoke is equal.
3. The method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field according to claim 1, wherein the method comprises the following steps: the distance between the two magnetic conduction blocks is not more than 20 mm.
4. The method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field according to claim 3, wherein the magnetic conduction blocks can be replaced with different sizes according to different pipe diameters.
5. The method for identifying and positioning the weld joint of the steel pipe based on the leakage magnetic field according to claim 3, wherein the method comprises the following steps: the steel pipe is located the positive centre of two magnetic conduction blocks and the clearance of steel pipe and magnetic conduction block is not more than 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810598303.6A CN108941357B (en) | 2018-06-12 | 2018-06-12 | Steel pipe weld joint identification and positioning method based on leakage magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810598303.6A CN108941357B (en) | 2018-06-12 | 2018-06-12 | Steel pipe weld joint identification and positioning method based on leakage magnetic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108941357A CN108941357A (en) | 2018-12-07 |
| CN108941357B true CN108941357B (en) | 2021-04-09 |
Family
ID=64488239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810598303.6A Active CN108941357B (en) | 2018-06-12 | 2018-06-12 | Steel pipe weld joint identification and positioning method based on leakage magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108941357B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711508B2 (en) * | 1987-03-10 | 1995-02-08 | 住友金属工業株式会社 | Leakage magnetic flux flaw detection method |
| DE3832034A1 (en) * | 1988-09-21 | 1990-03-22 | Stemme Otto | Testing device for ferromagnetic tubes and/or rods |
| CN2446518Y (en) * | 2000-09-21 | 2001-09-05 | 钢铁研究总院 | Steel pipe magnetic leakage crack detection device |
| GB2492745A (en) * | 2011-06-06 | 2013-01-16 | Silverwing Uk Ltd | Magnetic flux leakage inspection |
| JP2013185951A (en) * | 2012-03-08 | 2013-09-19 | Jfe Steel Corp | Magnetic flaw detection probe |
| CN103175891A (en) * | 2013-02-28 | 2013-06-26 | 厦门大学 | Permanent magnet and pulsed eddy current composite magnetic flux leakage detection method |
| CN103353478B (en) * | 2013-06-28 | 2016-02-03 | 厦门大学 | The compound lossless detection method of a kind of magnetosonic imaging and leakage field imaging |
| CN103776897B (en) * | 2014-02-18 | 2015-05-06 | 华中科技大学 | Magnetic flux leakage testing method and device based on defect magnetic flux leakage region reversed field |
| CN204117737U (en) * | 2014-05-04 | 2015-01-21 | 上海岩川电磁科技有限公司 | A kind of magnetization magnetic structure |
| CN205749397U (en) * | 2016-06-22 | 2016-11-30 | 国网江西省电力公司南昌供电分公司 | A kind of steel tube defect detection device |
| CN206489114U (en) * | 2017-01-18 | 2017-09-12 | 中特检科技发展(北京)有限公司 | The sensor and system of type multimode electromagnetic ultrasound and Magnetic Flux Leakage Inspecting |
-
2018
- 2018-06-12 CN CN201810598303.6A patent/CN108941357B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108941357A (en) | 2018-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10401325B2 (en) | Magnetizers for pigging tools | |
| US10315237B2 (en) | Pig, in particular inspection or cleaning pig | |
| US8487610B2 (en) | Magnetising assembly | |
| CN108941357B (en) | Steel pipe weld joint identification and positioning method based on leakage magnetic field | |
| CN111902669B (en) | Magnetic flux leakage PIG | |
| CN111766292A (en) | Steel rail magnetic flux leakage detection device based on zero lift-off rolling magnetization | |
| JPH0643991B2 (en) | Jig for moving / centering the pipe | |
| CN103901097A (en) | Method for detecting incomplete root penetration of ferromagnetic thin wall pipe | |
| CN103914838B (en) | Method for identifying defects of industrial x-ray weld joint image | |
| CN211292718U (en) | Synchronous self-walking system of pipeline internal and external detection instrument | |
| Kim et al. | Detection method of cracks by using magnetic fields in underground pipeline | |
| CN203811577U (en) | Magnetic powder detection test block assembly for incomplete welding of root part of iron magnetic thin-wall pipe with wall thickness of not more than 4mm | |
| KR20140117985A (en) | Apparatus for detecting defect of rolled coil | |
| CN101844290A (en) | Manufacturing process of close-wound wall sticking coil tubes for large-scale equipment | |
| JP6305859B2 (en) | Nondestructive inspection method | |
| Wang et al. | Application progress of tri-axial MFL sensors technology | |
| CN1061760C (en) | Magnetic fault detector | |
| CN209311392U (en) | Continuous pipe on-line measuring device | |
| CA2992363C (en) | Magnetizer for pigging tools | |
| CN202229890U (en) | Leak detection device | |
| CN113092572B (en) | Method for determining magnetization intensity required by pipeline to reach magnetic saturation | |
| CN215953458U (en) | Magnetic leakage flaw detection magnetic pole suitable for steel pipes with various sizes and pipe diameters | |
| Nagaraj | Smart pigging in high pressure gas pipeline practical problems and solutions: a case study | |
| CN217359673U (en) | Ferromagnetic boiler pipeline appurtenance that shoots | |
| CN107910169A (en) | A kind of apparatus for fixing transformer and its manufacture method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |