CN107421475B - Ultrasonic detection device for layered detection and thickness measurement of thin-wall steel pipe - Google Patents
Ultrasonic detection device for layered detection and thickness measurement of thin-wall steel pipe Download PDFInfo
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- CN107421475B CN107421475B CN201710695397.4A CN201710695397A CN107421475B CN 107421475 B CN107421475 B CN 107421475B CN 201710695397 A CN201710695397 A CN 201710695397A CN 107421475 B CN107421475 B CN 107421475B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000005259 measurement Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention provides an ultrasonic detection device for layered detection and thickness measurement of a thin-wall steel pipe, which comprises: the base is provided with a positioning block at the bottom, the positioning block is provided with an opening matched with the outer diameter of the steel pipe to be measured, and the base is arranged on the outer diameter of the steel pipe to be measured in a mode of being perpendicular to the axis of the steel pipe to be measured through the positioning block; the bottom of the delay block is exposed through the mounting hole; and the elastic floating module is arranged in the mounting hole, so that the ultrasonic detection probe can float in the mounting hole. By adopting the ultrasonic detection device provided by the invention, an operator can automatically keep the sound beam vertical to the surface of the steel pipe by only sliding the probe along the steel pipe, and the direction of the probe is not required to be controlled by a person constantly and manually to keep the sound beam vertical, so that the ultrasonic detection device is convenient and quick.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to an ultrasonic detection device for layered detection and thickness measurement of a thin-wall steel pipe.
Background
In the metallurgical industry, a professional automatic ultrasonic detection system is mainly adopted to detect the layering defect and the wall thickness of the steel pipe. Because the pipe end has a detection blind area with a certain length in the automatic detection, the defects found in the automatic detection sometimes need to be checked by adopting manual detection, and the automatic ultrasonic detection system sometimes cannot be suitable for pipes with all specifications, so the manual ultrasonic detection method is a necessary supplement for ultrasonic automatic detection.
When the layering defect and the wall thickness of the steel pipe are detected manually and ultrasonically, the thick-wall pipe can be detected by adopting a double-crystal straight probe, but when the thin-wall pipe (such as the wall thickness of less than 3 mm) is detected, the resolution and the thickness measuring precision of the double-crystal straight probe can not meet the detection requirement, the diameter of the thin-wall pipe is usually smaller, the problem of unstable coupling often exists in manual detection, and the actual detection efficiency and accuracy are affected.
In order to improve the detection resolution and the thickness measurement precision, a probe with a delay block can be selected, but the probe still has the problems of unstable coupling and low detection efficiency.
Disclosure of Invention
On the basis of a common high-frequency delay block probe, the invention designs the floating device with the probe and the V-shaped positioning device, so that the direction of the sound beam of the probe is kept perpendicular to the surface of the steel pipe, and the delay block of the probe and the workpiece stably maintain proper pressure, thereby achieving stable coupling. The specific scheme is as follows:
An ultrasonic testing device for layered detection and thickness measurement of a thin-walled steel pipe, comprising:
The base is provided with a positioning block at the bottom, the positioning block is provided with an opening matched with the outer diameter of the steel pipe to be measured, and the base is arranged on the outer diameter of the steel pipe to be measured in a mode of being perpendicular to the axis of the steel pipe to be measured through the positioning block;
The bottom of the delay block is exposed through the mounting hole;
And the elastic floating module is arranged in the mounting hole, so that the ultrasonic detection probe can float in the mounting hole.
Furthermore, the positioning block is detachably fixed at the bottom of the base, and the positioning block with corresponding specification is selected according to the outer diameter size of the steel pipe to be installed at the bottom of the base.
Further, the ultrasonic detection probe is a double-crystal straight probe.
Furthermore, the positioning blocks are inclined wedges which are independently arranged on two sides of the bottom of the base; the bottom of the base and two sides of the mounting hole are provided with a plurality of equally spaced threaded holes.
Furthermore, the positioning blocks are integrally designed.
Further, the inner wall of the opening of the positioning block is a straight line or a concave curve.
Further, the delay block is made of polystyrene material.
Further, the elastic floating module is a spring, and the spring is positioned at the top of the mounting hole and sleeved on the outer diameter of the delay block.
Further, a fastening piece is arranged at the top of the ultrasonic detection probe and is fixed at the top of the mounting hole through threads.
Further, the wall thickness of the thin-wall steel pipe is smaller than 3mm.
The probe of the invention has the following remarkable advantages compared with the prior common delay block probe:
1. By means of the positioning block and the elastic floating module, the whole detection device can be well ensured to be vertical to the surface of the workpiece, the coupling stability is improved, and the detection error is reduced.
2. And the whole device is not required to be observed by naked eyes to be vertical to the surface of the workpiece, so that the detection efficiency is improved, and the probe is fast and convenient to move.
3. The labor intensity is reduced, an operator can automatically keep the sound beam vertical to the surface of the steel pipe by only sliding the probe along the steel pipe, and the operator does not need to constantly and manually control the direction of the probe by the operator to keep the sound beam vertical.
4. The opening width of the positioning block is adjustable, and the positioning block can be adapted according to the different outer diameters of the measured steel pipes;
5. the delay block is made of polystyrene material with good low attenuation performance, so that the measurement accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIGS. 1 and 2 are schematic views of an ultrasonic testing device provided in two embodiments of the present invention;
fig. 3 is a schematic diagram of an ultrasonic inspection probe.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be presented in the following description in order to explain the technical solution of the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.
The invention provides an ultrasonic detection device for layered detection and thickness measurement of a thin-wall steel pipe, which comprises:
the base 7, the bottom of the base 7 is provided with a positioning block 9, the positioning block 9 is provided with an opening matched with the outer diameter of the steel pipe to be measured, and the base 7 is arranged on the outer diameter of the steel pipe to be measured in a mode of being perpendicular to the axis of the steel pipe to be measured through the positioning block 9;
The top in the base 7 is penetrated with a mounting hole from the bottom, an ultrasonic detection probe 10 is arranged in the mounting hole, the bottom of the ultrasonic detection probe 10 is provided with a delay block 4, and the bottom of the delay block 4 is exposed through the mounting hole;
the elastic floating module 5 is arranged in the mounting hole, so that the ultrasonic detection probe 10 can float in the mounting hole.
By means of the device provided by the invention, whether the steel pipe to be detected is layered or not can be detected, and the thickness of the steel pipe can be accurately detected.
In an alternative embodiment of the present invention, the positioning block 9 is detachably fixed at the bottom of the base 7, and the positioning block 9 with a corresponding specification is selected according to the outer diameter size of the steel pipe to be installed at the bottom of the base 7.
In an alternative embodiment of the present invention, the ultrasonic inspection probe 10 is a bimorph probe having two test chips 8 at an angle to each other inside. Further preferably, the probe is a high-frequency broadband delay block probe with a frequency of 10-20MHz and a chip diameter of 3-6mm.
In an alternative embodiment of the present invention, the positioning blocks 9 are wedges independently arranged on two sides of the bottom of the base 7; a plurality of equally spaced threaded holes are arranged at the bottom of the base 7 and at two sides of the first through hole. In practical application, the positioning blocks 9 with corresponding specifications (namely positioning blocks with different opening sizes) can be replaced by directly according to the outer diameter sizes of the steel pipes, and the wedges at the two sides of the bottom of the base 7 can be moved to the middle or two sides appropriately according to practical situations and then fixed, so that the effect of adjusting the opening width of the positioning blocks 9 can be achieved. When the outer diameter of the steel pipe is smaller, a threaded hole adjacent to the mounting hole is selected as a fixing hole for fixing the positioning block; if the outer diameter of the measured steel pipe is larger, a threaded hole far away from the mounting hole can be selected as a fixing hole for fixing the positioning block, so that an opening at the bottom of the positioning block 9 is enlarged to adapt to the steel pipe with larger outer diameter. As shown in fig. 1, the positioning block 9 is fixed to the bottom of the base 7 by a screw 6. Further, a fastening screw 3 is further provided on one side of the base 7 for fixing the ultrasonic detection probe 10 located in the mounting hole.
In an alternative embodiment of the invention, the positioning block 9 is of integral design. It should be noted that, no matter what design the positioning block 9 is designed, the hole exposed by the delay block 4 needs to be reserved, so that the delay block 4 can be in contact with the outer wall of the steel pipe.
In an alternative embodiment of the present invention, the inner wall of the opening of the positioning block 9 is a straight line or a concave curve. The opening of the positioning block 9 is in a straight line, so that the processing difficulty of the positioning block 9 can be reduced, and the production cost is reduced, as shown in fig. 1; further referring to fig. 2, the opening of the positioning block 9 is curved, so that the fitting degree of the positioning block 9 and the outer wall of the steel pipe can be improved, the whole detection device is better ensured to be perpendicular to the axis of the steel pipe, and the detection precision is improved.
In an alternative embodiment of the invention, the delay block 4 is made of polystyrene material with better low attenuation performance, and long-term experiment material selection proves that better measurement effect can be realized and measurement accuracy can be improved by selecting the material.
In an alternative embodiment of the invention, the elastic floating module 5 is a spring, which is located in the bottom of the mounting hole and is sleeved on the outer diameter of the delay block 4. Further, a housing 2 having a width larger than that of the delay block 4 is provided at an upper portion of the delay block 4, so that a step is formed at a top of the delay block 4. After the ultrasonic detection device is placed on the outer diameter of the steel pipe, the shell 4 can downwards press the spring, so that the ultrasonic detection device floats in the mounting hole under the action of the spring, the delay block and the probe are always kept in a vertical state with the outer wall of the steel pipe, and the measurement accuracy is further ensured. The spring is always positioned at the bottom of the mounting hole, and is prevented from falling off due to external pressure.
In an alternative embodiment of the present invention, a fastener 1 is provided on the top of the ultrasonic detection probe 10, and the fastener 1 is screwed on the top of the mounting hole. The ultrasonic detection probe 10 may be fixed in the mounting hole by rotating the fastener 1.
In an alternative embodiment of the invention, the wall thickness of the thin-walled steel pipe is less than 3mm.
The probe of the invention has the following remarkable advantages compared with the prior common delay block probe:
1) The coupling stability is improved, and the detection error is reduced.
2) The detection efficiency is improved, and the probe is fast and convenient to move.
3) The labor intensity is reduced, an operator can automatically keep the sound beam vertical to the surface of the steel pipe by only sliding the probe along the steel pipe, and the operator does not need to constantly and manually control the direction of the probe by the operator to keep the sound beam vertical.
The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, wherein devices and structures not described in detail are to be understood as being implemented in a manner common in the art; any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention, using the methods and technical contents disclosed above, without affecting the essential content of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. An ultrasonic detection device for layered detection and thickness measurement of a thin-walled steel pipe, comprising:
The base is provided with a positioning block at the bottom, the positioning block is provided with an opening matched with the outer diameter of the steel pipe to be measured, and the base is arranged on the outer diameter of the steel pipe to be measured in a mode of being perpendicular to the axis of the steel pipe to be measured through the positioning block;
The bottom of the delay block is exposed through the mounting hole;
The elastic floating module is arranged in the mounting hole, so that the ultrasonic detection probe can float in the mounting hole;
The positioning block is detachably fixed at the bottom of the base, and the positioning block with corresponding specification is selected according to the outer diameter size of the steel pipe to be mounted at the bottom of the base;
the positioning block is an inclined wedge which is independently arranged at two sides of the bottom of the base, the positioning block is integrally designed, and the inner wall of an opening of the positioning block is a straight line or a concave curve.
2. The ultrasonic testing device for layered detection and thickness measurement of thin-walled steel pipes according to claim 1, wherein the ultrasonic testing probe is a bimorph probe.
3. An ultrasonic testing device for layered testing and thickness measurement of thin-walled steel pipes according to claim 2 wherein a plurality of equally spaced threaded holes are provided in the base bottom on either side of the mounting holes.
4. The ultrasonic testing device for layered detection and thickness measurement of thin-walled steel pipes according to claim 1, wherein the delay block is made of polystyrene material.
5. The ultrasonic detection device for layered detection and thickness measurement of thin-walled steel pipes according to claim 1, wherein the elastic floating module is a spring, and the spring is positioned at the top of the mounting hole and sleeved on the outer diameter of the delay block.
6. An ultrasonic testing device for layered testing and thickness measurement of thin-walled steel pipes according to claim 1 wherein fasteners are provided on top of the ultrasonic testing probe and are threadably secured to the top of the mounting holes.
7. An ultrasonic testing device for layered testing and thickness measurement of thin-walled steel pipes according to claim 1 wherein the thin-walled steel pipes have a wall thickness of less than 3mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695397.4A CN107421475B (en) | 2017-08-15 | 2017-08-15 | Ultrasonic detection device for layered detection and thickness measurement of thin-wall steel pipe |
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| CN201710695397.4A CN107421475B (en) | 2017-08-15 | 2017-08-15 | Ultrasonic detection device for layered detection and thickness measurement of thin-wall steel pipe |
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| CN107421475B true CN107421475B (en) | 2024-07-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108828061B (en) * | 2018-06-14 | 2022-05-27 | 上海应用技术大学 | Eddy current detection device for surface micro-defects of stainless steel seamless short pipe |
| CN109254085B (en) * | 2018-11-07 | 2020-12-08 | 国网四川省电力公司成都供电公司 | Probe laminating device for high-altitude GIS ultrasonic testing |
| CN109254084B (en) * | 2018-11-07 | 2021-01-01 | 国网四川省电力公司成都供电公司 | GIS tank body ultrasonic testing-based implementation method |
| CN111174739A (en) * | 2019-12-25 | 2020-05-19 | 南京理工大学 | Device and method for measuring thickness of free-form surface at any point |
| CN113607810B (en) * | 2021-07-02 | 2024-04-23 | 上海应用技术大学 | Online ultrasonic flaw detection device for defects of thin-wall metal straight-seam circular welded pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207066372U (en) * | 2017-08-15 | 2018-03-02 | 上海宝冶工程技术有限公司 | A kind of supersonic detection device for being used for thin-wall steel tube layered weighting and thickness measuring |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292142A (en) * | 1999-02-01 | 2000-10-20 | Nkk Corp | Tank bottom plate diagnosing equipment |
| US6772636B2 (en) * | 2002-11-06 | 2004-08-10 | Varco I/P, Inc. | Pipe flaw detector |
| CN101923075B (en) * | 2009-06-10 | 2014-05-07 | 中国科学院金属研究所 | Method for compensating vibration of automatic and ultrasonic steel pipe flaw detection probe |
| US8196472B2 (en) * | 2009-09-29 | 2012-06-12 | National Oilwell Varco, L.P. | Ultrasonic probe apparatus, system, and method for detecting flaws in a tubular |
| JP2013029434A (en) * | 2011-07-29 | 2013-02-07 | Hitachi-Ge Nuclear Energy Ltd | Ultrasonic flaw detection method |
| JP2013246046A (en) * | 2012-05-25 | 2013-12-09 | Nippon Steel & Sumitomo Metal | Electromagnetic ultrasonic inspection device and electromagnetic ultrasonic inspection method of steel material |
| CN103033597A (en) * | 2012-12-07 | 2013-04-10 | 上海宝冶工程技术有限公司 | Online detection method for pipelines of blast furnace |
| CN103148814B (en) * | 2013-01-30 | 2015-06-24 | 重庆大学 | Pipe portion liquid dipping automatic ultrasonic wall thickness measuring mechanism and measuring method |
| CN103743815B (en) * | 2013-12-19 | 2016-06-22 | 安泰科技股份有限公司 | The ultrasonic wave detecting system of bend pipe composite members many bed boundarys welding quality and method |
| KR101618158B1 (en) * | 2015-08-29 | 2016-05-04 | 엔디티엔지니어링(주) | Multi-channel ultrasonic Probe-block device |
| CN205538850U (en) * | 2016-04-08 | 2016-08-31 | 武汉华宇一目检测装备有限公司 | Steel pipe water logging ultrasonic flaw detection's two -stage tracking means |
| CN106645416B (en) * | 2016-11-29 | 2019-07-12 | 北京卫星制造厂 | A kind of thin-walled CFRP inside pipe fitting quality ultrasound phased array on-line testing method |
| CN106643591B (en) * | 2016-12-12 | 2018-11-09 | 大连理工大学 | The thin-wall part adaptively adjusted pop one's head in machine ultrasonic thickness-measuring method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207066372U (en) * | 2017-08-15 | 2018-03-02 | 上海宝冶工程技术有限公司 | A kind of supersonic detection device for being used for thin-wall steel tube layered weighting and thickness measuring |
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