Detection method and device without blind area for large calibre steel pipe without changing probe
A detection method and a technology without blind spots, applied in the direction of material magnetic variables, etc., can solve the problems that the detection method and device have not yet been found, cannot meet the actual needs of flaw detection, and defects cannot be detected, and achieve significant economic and social benefits and signal-to-noise ratio The effect of eliminating, saving trouble and time
Inactive Publication Date: 2008-11-19
HEFEI ZHONGDA INSPECTION TECH
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] At present, electromagnetic detection technology has been widely used in the industrial field. Due to the skin effect of the AC magnetic field, they can only detect defects on the surface of metal materials. For steel pipes, they can only detect defects on the outer wall. Defects that are deeper than the outer surface of the steel pipe cannot be detected. At the same time, the national electromagnetic testing standard GB / T6635 stipulates that the diameter limit of their detection steel pipe is 180mm, and the AC magnetic detection equipment for large diameter steel pipes exceeding 180mm cannot meet the actual needs of flaw detection. Moreover, the electromagnetic detection method has a detection blind zone of more than 200mm, and the defects in the blind zone cannot be detected
For steel pipes that move at high speed on the production line, are very long, have thicker pipe walls, and have a diameter greater than 60mm, especially 180mm or more, it has not been possible to detect the defects of the inner and outer walls, interior and ends dynamically and at high speed at the same time. Discover effective detection methods and devices
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0032] The steel pipe defect detection device of the present invention is: a supporting seat 10 is arranged, and the supporting seat 10 is installed on the bottom plate 11, and the rotating hollow shaft 8 is installed on the supporting seat 10, and the rotating hollow shaft 8 and the supporting seat 10 are installed and fixed by the bearing 9. . The rotating hollow shaft 8 is covered with a slip ring group 12, the rotating hollow shaft 8 is insulated from the slip ring 12, and a flange 13 is installed at one end of the rotating hollow shaft 8, and the outer side of the flange 13 is fixed with stainless steel bolts (non-magnetic material) at intervals A pure iron ring 17 is installed, and the central section of the pure iron ring 17 is symmetrically installed with two magnetizing coils 14 along the parallel direction of the steel pipe 1. A magnetic pole shoe 15 is installed in the center of the magnetizing coil 14. There are also probes 2 arrays in the pure iron ring 17. And th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
Login to View More
Abstract
The present invention discloses a heavy caliber steel pipe detection method and device without blind area and changing probe. The steel pipe fault detecting process includes: setting two coils rotated at high speed with a rotating unit and two linear sensor arrays between the coils and parallel with the steel pipe axis, making the sensor arrays connected to signal amplifier rotate with the coils, passing the steel pipe through the rotating coils with current to produce rotating magnetic field while contacting the sensor arrays to the outer wall of the steel pipe to pick up magnetic signal of steel pipe wall, amplifying the signal in the amplifier and processing the signal in the computer for identification, control and maintenance. The present invention realizes high speed detection without blind area and need of changing probe.
Description
technical field [0001] The invention relates to a device for detecting large-diameter steel pipes using a rotating DC magnetic field, especially a device for flaw detection and quality inspection of the inner and outer walls and interior of very long steel pipes with a diameter of more than 60 mm and moving at high speed on a production line . Background technique [0002] At present, electromagnetic detection technology has been widely used in the industrial field. Due to the skin effect of the AC magnetic field, they can only detect defects on the surface of metal materials. For steel pipes, they can only detect defects on the outer wall. Defects that are deeper than the outer surface of the steel pipe cannot be detected. At the same time, the national electromagnetic testing standard GB / T6635 stipulates that the diameter limit of their detection steel pipe is 180mm, and the AC magnetic detection equipment for large diameter steel pipes exceeding 180mm cannot meet the actu...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/87G01N27/82
Inventor 何辅云
Owner HEFEI ZHONGDA INSPECTION TECH