CN112649514A - Detection method for detecting flaw of track by using phased array crystal probe - Google Patents
Detection method for detecting flaw of track by using phased array crystal probe Download PDFInfo
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- 238000005299 abrasion Methods 0.000 description 2
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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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- 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
- G01N29/24—Probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/105—Number of transducers two or more emitters, two or more receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/262—Linear objects
- G01N2291/2623—Rails; Railroads
Abstract
The embodiment of the invention discloses a detection method for detecting a flaw of a track by using a phased array crystal probe, which comprises the following steps: determining a detection area, wherein the detection area comprises a first detection area and a second detection area; transmitting a main sound detection beam and an auxiliary sound detection beam to a first detection area; emitting a supplementary detection sound beam to the second detection area, wherein the supplementary detection sound beam is emitted into the second detection area to form a supplementary detection sound beam area, and the supplementary detection sound beam area covers the second detection area; in this way, the rail head of the rail is divided into the first detection area and the second detection area, and the main detection sound beam and the auxiliary detection sound beam are used for the first detection area and the supplementary detection sound beam is used for the second detection area, so that the problem that the rail head is inaccurately detected due to poor alignment, position offset and the like of a detection probe when the rail head is used is solved.
Description
Technical Field
The invention relates to a detection method, in particular to a detection method for detecting a flaw of a track by using a phased array crystal probe.
Background
The rail head transverse fatigue crack is commonly called nuclear damage, is one of the major monitored damages of the steel rail, and is about 60 percent according to the statistical display of heavy-load line data, and the damage easily causes the brittle failure of the steel rail and has great threat to the driving safety. At present, when the existing detection equipment detects, a detection probe is generally positioned on the surface of a track, and then the detection probe is driven to move on the surface of the track, so that the detection is carried out. However, in the detection process, the problem of missed detection is easy to occur, and due to the problems of abrasion and the like of the steel rail, the problems of poor centering, position deviation and the like are easy to occur when the detection probe is used for the rail head, so that the rail head cannot be accurately detected effectively.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method for detecting a flaw on a rail by using a phased array crystal probe, which can solve the problem of inaccurate detection on the rail head of the rail due to poor alignment, position offset and other problems occurring when the detection probe is used for the rail head in the detection process by performing layout design on an ultrasonic beam emitted into the rail head of the rail.
In order to achieve the purpose, the technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a detection method for detecting a flaw of a track by using a phased array crystal probe, which comprises the following steps:
determining a detection area, wherein the detection area comprises a first detection area and a second detection area;
emitting a main sound beam and an auxiliary sound beam to a first detection area, wherein the main sound beam is emitted into the first detection area to form a main sound beam detection area, the main sound beam detection area covers the first area to be detected, the auxiliary sound beam is emitted into the detection area to form an auxiliary sound beam detection area, and the auxiliary sound beam detection areas are positioned on two sides of the main sound beam detection area in a plane where a transverse section of a steel rail is positioned and are partially overlapped with the main sound beam detection area;
and emitting a supplementary detection sound beam to the second detection area, wherein the supplementary detection sound beam is emitted into the second detection area to form a supplementary detection sound beam area, and the supplementary detection sound beam area covers the second detection area.
In the embodiment of the invention, the main sound detecting beam, the auxiliary sound detecting beam and the supplementary sound detecting beam are all emitted through a phased array crystal probe, the phased array crystal probe is arranged on the steel rail, and PA probes on the phased array crystal probe are longitudinally arranged along the moving direction of the phased array crystal probe during detection.
In the embodiment of the present invention, the emission points O of the main detection sound beam, the auxiliary detection sound beam, and the supplementary detection sound beam are located at the center line of the surface of the steel rail.
In the embodiment of the invention, two first areas are arranged and are positioned at two sides of the second area.
In the embodiment of the present invention, the method for determining the main sound detecting beam region is:
selecting an endpoint A and an endpoint B on a railjaw line in the first area, and determining an emission point O for emitting the main sound detection beam;
and connecting the emission point O with the end point A to obtain a contour line OA, connecting the emission point O with the end point B to obtain a contour line OB, wherein the contour line OA, the contour line OB and the railjaw line form an incident area of the main sound detecting beam, the incident area of the main sound detecting beam is reflected to the track surface in the first area through the railjaw line and forms a reflection area of the main sound detecting beam, and the incident area of the main sound detecting beam and the reflection area of the main sound detecting beam form the main sound detecting beam area.
In the embodiment of the present invention, the method for determining the auxiliary sound detection beam region is:
selecting a midpoint D of the endpoint A and the endpoint B on the railjaw line;
determining a distance L from the midpoint D to the endpoint A/the endpoint B;
extending the distance L outwards from the end point A along the direction of the straight line where the rail jaw line is located to obtain an end point E, and extending the distance L outwards from the end point B to obtain an end point F;
connecting an emission point O with the middle point D to obtain a contour line OD, connecting the emission point O with the end point E to obtain a contour line OE, and connecting the emission point O with the end point F to obtain a contour line OF;
the contour line OD, the contour line OE, and the rail jaw line form an incident region of one of the auxiliary sound detection beam regions, and the incident region of the one of the auxiliary sound detection beam regions reflects toward the track surface in the first region through the rail jaw line and forms a reflection region of the one of the auxiliary sound detection beams;
the contour line OD, the contour line OF, and the railjaw line constitute an incident region OF the other auxiliary sound detection beam region, and the incident region OF the other auxiliary sound detection beam region is reflected to the track surface in the first region through the railjaw line and constitutes a reflection region OF the other auxiliary sound detection beam.
In the embodiment of the present invention, the method for determining the supplementary detection sound beam region is:
determining a connection point G and a connection point H of the railjaw line and the rail waist;
connecting the emission point O with the connection point G to obtain a contour line OG, and connecting the emission point O with the connection point H to obtain a contour line OH;
wherein, the area between the contour line OG and the midline forms a first detection sound beam area; the region between the contour line OH and the center line constitutes a second detection acoustic beam region, and the first detection acoustic beam region and the second detection acoustic beam region constitute the supplementary detection acoustic beam.
In the embodiment of the present invention, the angles between the main sound detecting beam, the auxiliary sound detecting beam, and the supplementary sound detecting beam emitted from the emission point O and the surface of the steel rail are all 70 °.
In the embodiment of the invention, the coincidence ratio between the incident area of the main sound detection beam area and the incident area of the auxiliary sound detection beam area is less than or equal to 50%.
The embodiment of the invention provides a detection method for detecting a flaw of a track by using a phased array crystal probe, which comprises the following steps: determining a detection area, wherein the detection area comprises a first detection area and a second detection area; emitting a main sound detection beam and an auxiliary sound detection beam to a first detection area, wherein the main sound detection beam is irradiated into the first detection area to form a main sound detection beam area, the main sound detection beam area covers the first area to be detected, the auxiliary sound detection beam is irradiated into the detection area to form an auxiliary sound detection beam area, and the auxiliary sound detection beam areas are positioned on two sides of the main sound detection beam area in a plane of a transverse section of a steel rail and are partially overlapped with the main sound detection beam; emitting a supplementary detection sound beam to the second detection area, wherein the supplementary detection sound beam is emitted into the second detection area to form a supplementary detection sound beam area, and the supplementary detection sound beam area covers the second detection area; in this way, the rail head of the rail is divided into the first detection area and the second detection area, the problem of missed detection is avoided by using the main detection sound beam and the auxiliary detection sound beam for the first detection area and using the supplementary detection sound beam for the second detection area, and the problem of inaccurate detection of the rail head caused by poor alignment, position offset and the like of a detection probe when the rail head is used is eliminated.
Drawings
FIG. 1 is a schematic front view of a layout design for flaw detection of a rail using a conventional ultrasonic probe according to an embodiment of the present invention;
FIG. 2 is a schematic plan view of a layout design for performing flaw detection on a rail by using a conventional ultrasonic probe according to an embodiment of the present invention;
fig. 3 is a schematic diagram of sound beam emission when the phased array crystal probe according to the first embodiment of the present invention emits a main sound detection beam;
fig. 4 is a schematic view of sound beam emission of a phased array crystal probe for detecting a first detection area according to an embodiment of the present invention;
fig. 5 is a schematic diagram of sound beam emission when the phased array crystal probe according to the first embodiment of the present invention emits an auxiliary detection sound beam;
fig. 6 is a schematic diagram of the detection of the rail head by the phased array crystal probe according to the second embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
At present, the conventional ultrasonic probe is adopted for steel rail flaw detection, and the detection is carried out by two modes of a steel rail flaw detection vehicle or a hand-push detector. The small instrument adopts a sliding shoe type probe to directly contact with the surface of the steel rail for detection, the steel rail is completely covered by 9 ultrasonic channels, and the normal detection speed is 2-3 km/h. As shown in fig. 1 and 2, the ultrasonic layout includes straight beat 70 °, inner skew front and back 70 °, outer skew front and back 70 °, front and back 37 °, and 0 ° lanes. Primary wave detection of 70 degrees before and after direct hitting is mainly used for detecting that the ultrasonic coverage of the middle area of the rail head is only 20 percent; the 70-degree angles of the front and back sides and the inner and outer sides of the oblique striking are mainly used in the secondary wave detection rail side area, and the single-side ultrasonic coverage range is 45%.
The flaw detection vehicle adopts a mode of installing a probe inside a detection wheel to detect the steel rail, the detection wheel is externally wrapped with an acoustically transparent rubber film, coupling liquid for ultrasonic transmission is filled in the detection wheel, and the steel rail is completely covered by 15 ultrasonic channels. The ultrasonic layout comprises 70 degrees before and after straight beating (comprising 6 channels which are arranged side by side in the outer, middle and inner channels), 70 degrees before and after inner oblique beating, 37 degrees before and after inner oblique beating, 55 degrees left and right channels after side beating and 3 0-degree channels. When the rail head is detected, the probe wheel is in contact detection with the surface of the steel rail, a probe is arranged in the probe wheel, coupling liquid is filled in the probe wheel, and a sound-transmitting rubber outer film is wrapped outside the probe wheel; the front and back 70 degrees (outer, middle and inner) primary wave detection railhead areas are directly hit, 3 wafers are arranged in parallel, and the outer side gauge angle area has no sound beam coverage and a blind area. The flaw detection vehicle has serious missed detection when the railhead is detected.
When the two detection devices are used for detecting the railhead, the 70-degree near-surface detection area limited by the wafer is narrower, and the utilization rate of primary waves is only 20%; limited by the detection speed, the system cannot bear more line detection tasks; when the rail flaw detection vehicle equipment is adopted for detection, poor centering is easy to occur, and the problems that small-radius curve sound longitudinally deviates in the incident direction of a rail surface or the position of an incident point transversely deviates occur; the method can not adapt to the flaw detection of the steel rails with different rail types and different abrasion loss;
example one
In view of the above problem, an embodiment of the present invention provides a method for detecting a track by using a phased array crystal probe, as shown in fig. 3 to 5, where the method includes:
determining a detection area, wherein the detection area comprises a first detection area and a second detection area;
emitting a main sound detection beam and an auxiliary sound detection beam to a first detection area, wherein the main sound detection beam is irradiated into the first detection area to form a main sound detection beam area 1, the main sound detection beam area 1 covers the first area to be detected, the auxiliary sound detection beam is irradiated into the detection area to form an auxiliary sound detection beam area 2, and the auxiliary sound detection beam area 2 is positioned on two sides of the main sound detection beam area 1 in a plane where a transverse section of a steel rail is positioned and is partially overlapped with the main sound detection beam;
and emitting a supplementary detection sound beam to the second detection area, wherein the supplementary detection sound beam is emitted into the second detection area to form a supplementary detection sound beam area 3, and the supplementary detection sound beam area 3 covers the second detection area.
Here, the detection area is a rail head of a rail, and the rail head of the rail includes three areas, wherein the second area is located in the middle of the rail head, and two first areas are located on two sides of the second area respectively.
In the detection process, the phased array crystal probe is adopted to detect the rail head of the rail in the embodiment of the invention, and specifically, the phased array crystal probe is arranged at the center line of the surface of the rail, namely, the point O shown in fig. 3-6. And the main sound detecting beam, the auxiliary sound detecting beam and the supplementary sound detecting beam are all transmitted through a PA probe on the phased array crystal probe. When the phased array crystal probe is arranged, the PA probes on the phased array crystal probe are longitudinally arranged along the moving direction of the phased array crystal probe during detection, the number of the PA probes is more than two, namely as shown in figures 3-5, the longitudinal arrangement refers to that the PA probes are laid and arranged on the surface of the rail head of the rail, and the PA probes are arranged in parallel in the horizontal direction and are arranged in parallel relative to the rail. Therefore, when detection is carried out, the phased array crystal probe can be controlled through a delay rule, acoustic beam deflection and focusing can be realized on a series of planes vertical to an incident plane, and the existing probe physical torsion angle technology is replaced. And the ultrasonic layout configuration and flexibility are higher, the response can be timely carried out according to the field requirements, the adjustment can be made, and the track gauge angle area can be fully covered by the sound field.
The detection method of the phased array crystal probe is that the phased array crystal probe is obliquely shot by 70 degrees, and specifically, included angles between the main sound detection beam, the auxiliary sound detection beam and the supplementary detection sound beam which are emitted from an emission point O and the surface of the steel rail are all 70 degrees.
The main sound detecting beam and the auxiliary sound detecting beam are used for detecting the first area, wherein the main sound detecting beam is irradiated into the first detection area to form a main sound detecting beam area 1, and the main sound detecting beam area 1 covers the first area to be detected. The auxiliary sound beam detection area 2 is irradiated into the detection area to form an auxiliary sound beam detection area 2, the auxiliary sound beam detection area 2 is positioned on two sides of the main sound beam detection area 1 in a plane of a transverse section of the steel rail and is partially overlapped with the main sound beam detection area, when the phased array crystal probe moves on the surface of the steel rail, poor centering easily occurs, and when a centering mechanism responds frequently and untimely in detection of a small radius curve, irregularity and serpentine line, ultrasonic is caused to generate longitudinal deviation in the incident direction of the rail surface or transverse deviation of the incident point position, in order to avoid the problem, the auxiliary sound beam detection area 2 is generated in the rail head through the auxiliary sound beam detection area 2, the two auxiliary sound beam detection areas 2 are respectively positioned on two sides of the main sound beam detection area 1, so that when detection is carried out, when the auxiliary sound beam detection area 2 can compensate the area which is missed in detection of the main sound beam detection area 1 and is caused by deviation And (4) compensating for detection, wherein the auxiliary detection sound beam area 2 can replace the main detection sound beam area 1, so that the detection coverage of the first area on the railhead is ensured, and the detection accuracy is further improved. Further, in the embodiment of the present invention, a coincidence rate between the incident area of the main sound beam detection area 1 and the incident area of the auxiliary sound beam detection area 2 is less than or equal to 50%, so that it can be ensured that the auxiliary sound beam detection area 2 can completely detect the first detection area during detection, and the auxiliary sound beam detection area 2 can also perform supplementary detection on the second detection area near the second detection area, thereby further improving the detection accuracy.
Further, in the embodiment of the present invention, the method for determining the main sound detection beam region 1 is:
selecting an endpoint A and an endpoint B on a railjaw line in the first area, and determining an emission point O for emitting the main sound detection beam; here, the end points a and B may be end points at both ends of the jawbone line.
And connecting the emission point O with the end point A to obtain a contour line OA, connecting the emission point O with the end point B to obtain a contour line OB, wherein the contour line OA, the contour line OB and the railjaw line form an incident area of the main sound detecting beam, the incident area of the main sound detecting beam is reflected to the track surface in the first area through the railjaw line and forms a reflection area of the main sound detecting beam, and the incident area of the main sound detecting beam and the reflection area of the main sound detecting beam form a main sound detecting beam area 1.
Further, in the embodiment of the present invention, the method for determining the auxiliary sound detection beam region 2 is:
selecting a midpoint D of the endpoint A and the endpoint B on the railjaw line;
determining a distance L from the midpoint D to the endpoint A/the endpoint B;
extending the distance L outwards from the end point A along the direction of the straight line where the rail jaw line is located to obtain the end point E, and extending the distance L outwards from the end point B to obtain the end point F;
connecting an emission point O with the middle point D to obtain a contour line OD, connecting the emission point O with the end point E to obtain a contour line OE, and connecting the emission point O with the end point F to obtain a contour line OF;
the contour line OD, the contour line OE, and the railjaw line form an incident region of one of the auxiliary detection sound beam regions 2, and the incident region of the one of the auxiliary detection sound beam regions 2 is reflected to the track surface in the first region through the railjaw line to form a reflection region of the one of the auxiliary detection sound beams;
the contour line OD, the contour line OF, and the railjaw line constitute an incident region OF the other auxiliary sound beam detection region 2, and the incident region OF the other auxiliary sound beam detection region 2 is reflected to the track surface in the first region through the railjaw line and constitutes a reflection region OF the other auxiliary sound beam detection region.
Further, in the embodiment of the present invention, the method of determining the supplementary detection sound beam region 3 is:
determining a connection point G and a connection point H of the railjaw line and the rail waist;
connecting the emission point O with the connection point G to obtain a contour line OG, and connecting the emission point O with the connection point H to obtain a contour line OH;
wherein, the area between the contour line OG and the midline forms a first detection sound beam area; the region between the contour line OH and the center line constitutes a second detection acoustic beam region, and the first detection acoustic beam region and the second detection acoustic beam region constitute the supplementary detection acoustic beam.
Here, the supplementary detection sound beam is mainly used for detecting the second region, that is, the screw holes in the middle of the rail head and the rail web can be detected.
Example two
In practical use, the common phased array ultrasonic flaw detection technology can realize the functions of multi-angle scanning, dynamic deflection, focusing and the like, and meets the requirements of full coverage of 43kg/m, 50kg/m, 60kg/m and 75kg/m steel rails, adaptability to detection (vertical grinding, side grinding and the like) under different line conditions and compatibility of incident point deviation caused by poor centering.
As shown in fig. 6, the phased array crystal probe in the embodiment of the present invention may simultaneously generate 8 angular sound beams (where one main sound detection beam and two auxiliary sound detection beams are respectively transmitted to two first detection areas, and two supplementary detection beams are generated to the second detection area), receive all ultrasonic echo signals, and process the ultrasonic echo signals into corresponding 8 angular sound beam echoes through real-time data. Therefore, the technology is very suitable for high-speed rail flaw detection.
The phased array crystal probe in the embodiment of the invention can be arranged on the wedge block, so that the sound beam is transmitted along the longitudinal direction of the steel rail, meanwhile, the PA probe is arranged on the wedge block in a transverse mode, and the sound beam also generates different inclination angles in the transverse direction of the steel rail through deflection focusing, thereby achieving the purpose that the conventional probe generates the deflection sound beam through a physical torsion angle.
The embodiment of the invention has the advantages that:
1. compared with the traditional detection method, the speed is obviously increased, and the labor cost and the influence of human factors on the detection result can be reduced;
2. the coverage rate of the rail head with the acoustic beam primary wave of the straight striking 70 degrees can reach 72 percent, and the full coverage of the rail head of the steel rail can be ensured by combining the inclined striking 70 degrees with the acoustic beam secondary wave, so that the nuclear damage detection rate of the rail head is improved;
3. the deflection angle of the phased array probe can respond in time according to the field requirement, is flexible and adjustable, is not limited by different rail types or steel rail grinding, can adapt to the detection of steel rails in all sections by one set of layout, has high compatibility and greatly reduces the flaw detection cost;
4. when the ultrasonic wave generates longitudinal deviation in the incident direction of the rail surface or generates transverse deviation at the incident point position, the original auxiliary sound beam can be converted into the main sound beam, and the main sound beam is converted into the auxiliary sound beam, so that the normal flaw detection of the equipment is not influenced.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.
Claims (9)
1. A method for detecting flaws in a track by using a phased array crystal probe is characterized by comprising the following steps:
determining a detection area, wherein the detection area comprises a first detection area and a second detection area;
emitting a main sound detection beam and an auxiliary sound detection beam to a first detection area, wherein the main sound detection beam is irradiated into the first detection area to form a main sound detection beam area (1), the main sound detection beam area (1) covers the first area to be detected, the auxiliary sound detection beam is irradiated into the detection area to form an auxiliary sound detection beam area (2), and the auxiliary sound detection beam areas (2) are positioned on two sides of the main sound detection beam area (1) in a plane where a transverse section of a steel rail is positioned and are partially overlapped with the main sound detection beam;
and emitting a supplementary detection sound beam to the second detection area, wherein the supplementary detection sound beam is emitted into the second detection area to form a supplementary detection sound beam area (3), and the supplementary detection sound beam area (3) covers the second detection area.
2. The method for detecting the flaw of the track by using the phased array crystal probe according to claim 1, wherein the main detection sound beam, the auxiliary detection sound beam and the supplementary detection sound beam are all emitted by the phased array crystal probe, the phased array crystal probe is arranged on the steel rail, and the PA probes on the phased array crystal probe are longitudinally arranged along the moving direction of the phased array crystal probe during the detection.
3. The method for detecting the flaw of the track by using the phased array crystal probe according to claim 1, wherein the emission points O of the main detection sound beam, the auxiliary detection sound beam and the supplementary detection sound beam are positioned at the center line of the surface of the steel rail.
4. The method for inspecting a rail by using a phased array crystal probe according to claim 1, wherein the first area is two and is located on two sides of the second area.
5. The inspection method for flaw detection of a rail by using a phased array crystal probe according to claim 1, characterized in that the method for determining the main acoustic beam area (1) is as follows:
selecting an endpoint A and an endpoint B on a railjaw line in the first area, and determining an emission point O for emitting the main sound detection beam;
and connecting the emission point O with the endpoint A to obtain a contour line OA, connecting the emission point O with the endpoint B to obtain a contour line OB, wherein the contour line OA, the contour line OB and the rail jaw line form an incident area of the main sound detection beam, the incident area of the main sound detection beam is reflected to the track surface in the first area through the rail jaw line to form a reflection area of the main sound detection beam, and the incident area of the main sound detection beam and the reflection area of the main sound detection beam form the main sound detection beam area (1).
6. The detection method for flaw detection of the track by the phased array crystal probe according to claim 1, wherein the method for determining the auxiliary detection sound beam area (2) is as follows:
selecting a midpoint D of the endpoint A and the endpoint B on the railjaw line;
determining a distance L from the midpoint D to the endpoint A/the endpoint B;
extending the distance L outwards from the end point A along the direction of the straight line where the rail jaw line is located to obtain an end point E, and extending the distance L outwards from the end point B to obtain an end point F;
connecting an emission point O with the middle point D to obtain a contour line OD, connecting the emission point O with the end point E to obtain a contour line OE, and connecting the emission point O with the end point F to obtain a contour line OF;
wherein the contour line OD, the contour line OE, and the rail jaw line constitute an incident region of one of the auxiliary detection beam regions (2), and the incident region of the one of the auxiliary detection beam regions (2) is reflected toward the track surface in the first region through the rail jaw line and constitutes a reflection region of the one of the auxiliary detection beams;
the contour line OD, the contour line OF and the railjaw line form an incident region OF the other auxiliary sound detecting beam region (2), and the incident region OF the other auxiliary sound detecting beam region (2) is reflected to the surface OF the track in the first region through the railjaw line and forms a reflection region OF the other auxiliary sound detecting beam.
7. The inspection method for flaw detection of a rail by using a phased array crystal probe according to claim 1, wherein the method for determining the supplementary inspection sound beam area (3) is as follows:
determining a connection point G and a connection point H of the railjaw line and the rail waist;
connecting the emission point O with the connection point G to obtain a contour line OG, and connecting the emission point O with the connection point H to obtain a contour line OH;
wherein, the area between the contour line OG and the midline forms a first detection sound beam area; and the area between the contour line OH and the central line forms a second detection sound beam area, and the first detection sound beam area and the second detection sound beam area form the supplementary detection sound beam.
8. The method for detecting the flaw of the track by using the phased array crystal probe according to claim 1, wherein the angles between the main detection sound beam, the auxiliary detection sound beam and the supplementary detection sound beam emitted from the emission point O and the surface of the steel rail are all 70 degrees.
9. The method for detecting the flaw of the track by using the phased array crystal probe according to claim 1, wherein the coincidence rate between the incident area of the main sound beam detection area (1) and the incident area of the auxiliary sound beam detection area (2) is less than or equal to 50%.
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| CN202011294939.5A Pending CN112649514A (en) | 2020-11-18 | 2020-11-18 | Detection method for detecting flaw of track by using phased array crystal probe |
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| JP2005037407A (en) * | 2004-11-05 | 2005-02-10 | Jfe Steel Kk | Ultrasonic defect detection method, and ultrasonic flaw detector |
| WO2016168576A1 (en) * | 2015-04-16 | 2016-10-20 | Transportation Technology Center, Inc. | System for inspecting rail with phased array ultrasonics |
| US9816964B1 (en) * | 2011-02-25 | 2017-11-14 | Vermon S.A. | Ultrasonic method and device for volumetric examination of aluminothermic rail welds |
| CN110217263A (en) * | 2019-05-16 | 2019-09-10 | 北京巨安永业科技有限公司 | A kind of double track four-wheel failure detector based on ultrasound |
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| US5261408A (en) * | 1990-02-12 | 1993-11-16 | Acuson Corporation | Variable origin-variable acoustic scanning method and apparatus |
| JP2005037407A (en) * | 2004-11-05 | 2005-02-10 | Jfe Steel Kk | Ultrasonic defect detection method, and ultrasonic flaw detector |
| US9816964B1 (en) * | 2011-02-25 | 2017-11-14 | Vermon S.A. | Ultrasonic method and device for volumetric examination of aluminothermic rail welds |
| WO2016168576A1 (en) * | 2015-04-16 | 2016-10-20 | Transportation Technology Center, Inc. | System for inspecting rail with phased array ultrasonics |
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Application publication date: 20210413 |