CN113960168A - Method for detecting transverse cracks of rail bottom of steel rail - Google Patents
Method for detecting transverse cracks of rail bottom of steel rail Download PDFInfo
- Publication number
- CN113960168A CN113960168A CN202111221072.5A CN202111221072A CN113960168A CN 113960168 A CN113960168 A CN 113960168A CN 202111221072 A CN202111221072 A CN 202111221072A CN 113960168 A CN113960168 A CN 113960168A
- Authority
- CN
- China
- Prior art keywords
- probe
- rail
- transverse
- wave
- longitudinal wave
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 137
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N29/04—Analysing solids
-
- 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
-
- 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
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
Abstract
The invention discloses a method for detecting transverse cracks of a rail bottom of a steel rail, which is characterized by comprising the following steps of: s1, directly or indirectly installing the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread in a sliding manner; s2, determining the distance L of incident points of the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread, wherein the distance L satisfies the following relational expression: l is H · tg (β), where H is the rail height of the steel rail and β is the refraction angle of the shear wave angle probe; s3, transmitting ultrasonic waves by a transverse wave oblique probe, and receiving by a longitudinal wave straight probe for receiving ultrasonic waves generated by a damaged top end at the bottom of the steel rail; and S4, judging whether the transverse crack of the rail bottom of the steel rail exists or not according to the fact that whether the longitudinal wave straight probe receives the ultrasonic wave or not in the preset time. The invention solves the problem that the damage caused by the rail bottom corrosion interference is difficult to interpret in the prior detection technology. The invention is suitable for the technical field of rail bottom flaw detection of steel rails.
Description
Technical Field
The invention belongs to the technical field of rail bottom flaw detection of steel rails, and particularly relates to a method for detecting transverse cracks of a rail bottom of a steel rail.
Background
The transverse crack at the bottom of the steel rail is a defect in the damage of the steel rail, and the damage develops in a crescent shape and is also called crescent tooth damage. The damage develops upwards from the rail bottom, and if the damage cannot be detected in time, the steel rail is easy to break, and the driving safety is affected.
At present, the rail bottom transverse crack detection method is realized by adopting an ultrasonic flaw detection method and utilizing an end angle reflection echo formed by the rail bottom transverse crack and the rail bottom surface in a vertical mode. As shown in fig. 1-2, the probe emits ultrasonic waves 4 from the rail tread surface at a predetermined refraction angle, the ultrasonic waves reflect the ultrasonic waves 4 through the flaw end angle, and the reflected ultrasonic waves 4 are received by the probe to detect flaws. However, because the rail bottom of the steel rail is often rusted, the reflected ultrasonic wave 4 of the rust pit is at the same position as the transverse crack wave emergence position of the rail bottom, and the judgment and identification of the flaw wave are seriously interfered. When the probe is scanned, the corrosion of the rail bottom can also influence the reflection of the damaged end angle, so that the amplitude of the reflected ultrasonic wave 4 is reduced and even disappears, and the missed detection of the damage is caused.
Disclosure of Invention
The invention provides a method for detecting transverse cracks of a rail bottom of a steel rail, which is used for solving the problem that damage caused by rail bottom corrosion interference is difficult to interpret in the existing detection technology.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a rail bottom transverse crack detection method of a steel rail is characterized by comprising the following steps:
s1, directly or indirectly installing the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread in a sliding manner;
s2, determining the distance L of incident points of the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread, wherein the distance L satisfies the following relational expression:
L＝H·tg(β)
h is the rail height of the steel rail, and beta is the refraction angle of the transverse wave angle probe;
s3, transmitting ultrasonic waves by a transverse wave oblique probe, and receiving by a longitudinal wave straight probe for receiving ultrasonic waves generated by a damaged top end at the bottom of the steel rail;
and S4, judging whether the transverse crack of the rail bottom of the steel rail exists or not according to the fact that whether the longitudinal wave straight probe receives the ultrasonic wave or not in the preset time.
Further, the angle range of the refraction angle beta of the transverse wave angle probe is 37-55 degrees.
Furthermore, the transverse wave oblique probe and the longitudinal wave straight probe are both wheel type probes and are installed on the flaw detection vehicle, a first sub-probe block in the transverse wave oblique probe is installed in an inclined mode at a preset angle, the refraction angle of the first sub-probe block for transmitting ultrasonic waves is beta, and a second sub-probe block in the longitudinal wave straight probe is installed in parallel with the rail tread.
Furthermore, the transverse wave oblique probe and the longitudinal wave straight probe are embedded in a main body frame of the scanning device, and the scanning device runs on a steel rail tread through a rail travelling wheel arranged at the lower end of the scanning device.
Furthermore, a handle for pushing the main body frame to walk is arranged on the main body frame.
Furthermore, the transverse wave angle probe and the longitudinal wave straight probe are assembled in a clearance mode, the transverse wave angle probe and the longitudinal wave straight probe can stretch and move up and down, and springs are mounted above the transverse wave angle probe and the longitudinal wave straight probe and used for guaranteeing the coupling pressure of the transverse wave angle probe and the longitudinal wave straight probe.
Further, the transverse wave oblique probe and the longitudinal wave straight probe are mounted on a probe frame of the trolley type flaw detector, and the probe frame advances along a rail track tread through a travelling wheel mounted at the lower end of the probe frame.
Due to the adoption of the structure, compared with the prior art, the invention has the technical progress that: the transverse wave oblique probe and the longitudinal wave straight probe of the invention keep the distance L of the incident points of the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread to displace along the rail tread, the transverse wave oblique probe reflects ultrasonic waves, when the ultrasonic waves act on a crack, the crack can reflect the ultrasonic waves and can generate diffraction ultrasonic waves at the tip of the crack, when the longitudinal wave straight probe receives the diffraction ultrasonic waves of the part, the crack at the corresponding position of the rail bottom is determined, and the corrosion does not have the capacity of the diffraction ultrasonic waves, so the interference of the corrosion of the rail bottom can be effectively shielded.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a structural schematic view of a rail foot crack of a steel rail;
FIG. 2 is a schematic reflection diagram of a single probe after scanning for cracks and rust at the bottom of a rail;
FIG. 3 is a schematic view of the present invention using a transverse wave angle probe and a longitudinal wave straight probe to scan the rail foot;
FIG. 4 is a schematic view of the scanning of the rail foot when both the transverse wave angle probe and the longitudinal wave straight probe are wheel probes according to the present invention;
FIG. 5 is a schematic structural view of a transverse wave angle probe and a longitudinal wave straight probe installed on a scanning device according to the present invention;
FIG. 6 is a schematic structural diagram of a transverse wave angle probe and a longitudinal wave straight probe of the present invention mounted on a cart type flaw detector.
Labeling components: 1-steel rail, 2-rail bottom transverse crack, 3-transmitting ultrasonic wave, 4-reflecting ultrasonic wave, 5-transverse wave inclined probe, 6-longitudinal wave straight probe, 7-diffraction ultrasonic wave, 8-rail travelling wheel, 9-main body frame, 10-scanning device, 11-wheel probe, 12-first sub-probe, 13-second sub-probe, 14-trolley flaw detector, 15-probe frame and 16-travelling wheel.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention.
The invention discloses a method for detecting transverse cracks of a rail bottom of a steel rail, which comprises the following steps:
s1, directly or indirectly installing the transverse wave oblique probe 5 and the longitudinal wave straight probe 6 on the rail tread of the steel rail 1 in a sliding manner;
s2, determining the distance L of the incident points of the transverse wave oblique probe 5 and the longitudinal wave straight probe 6 on the rail tread surface of the steel rail 1, wherein the distance L satisfies the following relational expression:
l ═ H · tg (β) (1) formula
Wherein H is the height of the steel rail 1, and beta is the refraction angle of the transverse wave angle probe 5;
s3, transmitting ultrasonic waves 3 by the transverse wave oblique probe 5, and receiving by the longitudinal wave straight probe 6 for receiving ultrasonic waves generated by the flaw top end at the rail bottom of the steel rail 1;
and S4, judging whether the rail bottom transverse crack 2 of the steel rail 1 exists or not according to the existence or nonexistence of the reception of the ultrasonic wave by the longitudinal wave straight probe 6 in a preset time.
The working principle of the invention is as follows: as shown in fig. 3, the transverse wave oblique probe 5 emits the ultrasonic emission wave 3 from the rail tread surface, the ultrasonic emission wave 3 is emitted to the flaw on the rail bottom, the diffracted ultrasonic wave 7 is generated at the flaw tip, and the diffracted ultrasonic wave 7 is received by the longitudinal wave straight probe 6, thereby realizing the detection and discovery of the flaw. The diffracted ultrasonic wave 7 is a longitudinal wave, and its propagation direction is the same as the direction of the flaw, both of which are perpendicular to the rail bottom surface. In the flaw detection by the transverse wave angle probe 5 and the longitudinal wave straight probe 6, the transverse wave angle probe 5 is used only for emitting and transmitting the ultrasonic wave 3, the refraction angle of the transverse wave angle probe 5 is 37-55 degrees, the preferred refraction angle is 37 degrees or 45 degrees, and when the refraction angle is 37 degrees or 45 degrees, the accuracy of the detected flaw is the highest; the longitudinal wave straight probe 6 is used only for receiving. The invention has the advantages that: the crack can reflect ultrasonic waves and generate the capability of diffracting the ultrasonic waves 7 at the tip of the crack, so that the crack at the corresponding position of the rail bottom is determined, and the corrosion does not have the capability of diffracting the ultrasonic waves 7, so that the interference of the corrosion of the rail bottom can be effectively shielded.
As shown in fig. 3, the propagation time of the ultrasonic wave in the steel rail 1 is:
T＝(H/cos(β))/Ctransverse wave+H//CLongitudinal wave(2) Formula (II)
H- - -the steel rail is 1 rail high;
beta- - -probe angle of refraction;
Ctransverse wave-steel medium shear wave velocity (3230 m/s);
Clongitudinal wave-longitudinal wave velocity in steel (5900 m/s);
when the refraction angle β of the probe 2 is 37 °, the parameters of each track are calculated by the following equations (1) and (2):
when the refraction angle β of the probe 2 is 45 °, the parameters of each track are calculated by the following equations (1) and (2):
as a preferred embodiment of the present invention, as shown in fig. 4, both the transverse wave angle probe 5 and the longitudinal wave straight probe 6 are wheel type probes 11 and are mounted on a flaw detection vehicle, a first sub-probe 12 of the transverse wave angle probe 5 is mounted obliquely at a predetermined angle, a refraction angle of the transmitted ultrasonic wave 3 of the first sub-probe 12 is β, and a second sub-probe 13 of the longitudinal wave straight probe 6 is mounted parallel to the rail 1 tread.
As a preferred embodiment of the present invention, as shown in fig. 5, a transverse wave angle probe 5 and a longitudinal wave angle probe 6 are embedded in a main body frame 9 of a scanning apparatus 10, a plurality of rail running wheels 8 are provided at the lower end of the scanning apparatus 10, and these rail running wheels 8 run on the rail tread of a steel rail 1, thereby realizing flaw detection of the rail bottom. Wherein, a handle for pushing the main body frame 9 to walk is arranged on the main body frame. The transverse wave angle probe 5 and the longitudinal wave straight probe 6 are assembled in a clearance mode, the transverse wave angle probe 5 and the longitudinal wave straight probe 6 can stretch and move up and down, and springs are mounted above the transverse wave angle probe 5 and the longitudinal wave straight probe 6 and used for guaranteeing the coupling pressure of the transverse wave angle probe 5 and the longitudinal wave straight probe 6.
As a preferred embodiment of the present invention, as shown in fig. 6, the transverse wave oblique probe 5 and the longitudinal wave straight probe 6 are mounted on a probe holder 15 of a cart type flaw detector 14, a plurality of traveling wheels 16 are mounted on a lower end of the probe holder 15, and the traveling wheels 16 travel along the rail tread of the steel rail 1, thereby realizing flaw detection of the rail bottom.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A rail bottom transverse crack detection method of a steel rail is characterized by comprising the following steps:
s1, directly or indirectly installing the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread in a sliding manner;
s2, determining the distance L of incident points of the transverse wave oblique probe and the longitudinal wave straight probe on the rail tread, wherein the distance L satisfies the following relational expression:
L＝H·tg(β)
h is the rail height of the steel rail, and beta is the refraction angle of the transverse wave angle probe;
s3, transmitting ultrasonic waves by a transverse wave oblique probe, and receiving by a longitudinal wave straight probe for receiving ultrasonic waves generated by a damaged top end at the bottom of the steel rail;
and S4, judging whether the transverse crack of the rail bottom of the steel rail exists or not according to the fact that whether the longitudinal wave straight probe receives the ultrasonic wave or not in the preset time.
2. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 1, wherein the method comprises the following steps: the angle range of the refraction angle beta of the transverse wave angle probe is 37-55 degrees.
3. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 1, wherein the method comprises the following steps: the transverse wave oblique probe and the longitudinal wave straight probe are both wheel type probes and are installed on a flaw detection vehicle, a first sub-probe block in the transverse wave oblique probe is installed in an inclined mode at a preset angle, the refraction angle of ultrasonic waves emitted by the first sub-probe block is beta, and a second sub-probe block in the longitudinal wave straight probe is installed in parallel with a steel rail tread.
4. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 1, wherein the method comprises the following steps: the transverse wave oblique probe and the longitudinal wave straight probe are embedded in a main body frame of the scanning device, and the scanning device runs on a steel rail tread through a rail travelling wheel arranged at the lower end of the scanning device.
5. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 4, wherein the method comprises the following steps: a handle for pushing the main body frame to walk is arranged on the main body frame.
6. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 4, wherein the method comprises the following steps: the transverse wave angle probe and the longitudinal wave straight probe are assembled in a clearance mode, the transverse wave angle probe and the longitudinal wave straight probe can stretch and move up and down, and springs are mounted above the transverse wave angle probe and the longitudinal wave straight probe and used for guaranteeing the coupling pressure of the transverse wave angle probe and the longitudinal wave straight probe.
7. The method for detecting the transverse crack of the rail bottom of the steel rail according to claim 1, wherein the method comprises the following steps: the transverse wave oblique probe and the longitudinal wave straight probe are mounted on a probe frame of the trolley type flaw detector, and the probe frame advances along a rail track tread through a travelling wheel mounted at the lower end of the probe frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111221072.5A CN113960168A (en) | 2021-10-20 | 2021-10-20 | Method for detecting transverse cracks of rail bottom of steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111221072.5A CN113960168A (en) | 2021-10-20 | 2021-10-20 | Method for detecting transverse cracks of rail bottom of steel rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113960168A true CN113960168A (en) | 2022-01-21 |
Family
ID=79465660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111221072.5A Pending CN113960168A (en) | 2021-10-20 | 2021-10-20 | Method for detecting transverse cracks of rail bottom of steel rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113960168A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09145696A (en) * | 1995-11-21 | 1997-06-06 | Toshiba Corp | Method and apparatus for measuring depth of flaw |
| JP2008107165A (en) * | 2006-10-24 | 2008-05-08 | Nagoya Institute Of Technology | Ultrasonic flaw detection method |
| US20090007678A1 (en) * | 2005-07-06 | 2009-01-08 | Hiroyuki Fukutomi | Method and apparatus for measuring flaw height in ultrasonic tests |
| US20090308163A1 (en) * | 2006-05-23 | 2009-12-17 | Hiroyuki Fukutomi | Ultrasonic Flaw Detection Apparatus and Ultrasonic Flaw Detection Program |
| CN103954687A (en) * | 2014-04-14 | 2014-07-30 | 大连天亿软件有限公司 | Ultrasonic inspection method, ultrasonic inspection device and integrated longitudinal wave, transverse wave and creeping wave ultrasonic angle beam probe |
| CN204832115U (en) * | 2015-08-18 | 2015-12-02 | 广深铁路股份有限公司广州工务段 | Rail device of detecting a flaw |
| CN105259254A (en) * | 2015-11-12 | 2016-01-20 | 湖南高速铁路职业技术学院 | Scanning device for steel rail bottom transverse cracks |
| RU2585304C1 (en) * | 2014-12-16 | 2016-05-27 | Дмитрий Анатольевич Князев | Transverse-longitudinal method for implementation of echo-ranging method for ultrasonic inspection of articles along whole section |
| CN106053611A (en) * | 2016-05-25 | 2016-10-26 | 中国铁道科学研究院 | Wheel type probe capable of detecting rail bottoms |
| CN213843123U (en) * | 2020-11-28 | 2021-07-30 | 邢台超拓科技开发有限公司 | Trolley type ultrasonic flaw detection device for steel rails |
-
2021
- 2021-10-20 CN CN202111221072.5A patent/CN113960168A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09145696A (en) * | 1995-11-21 | 1997-06-06 | Toshiba Corp | Method and apparatus for measuring depth of flaw |
| US20090007678A1 (en) * | 2005-07-06 | 2009-01-08 | Hiroyuki Fukutomi | Method and apparatus for measuring flaw height in ultrasonic tests |
| US20090308163A1 (en) * | 2006-05-23 | 2009-12-17 | Hiroyuki Fukutomi | Ultrasonic Flaw Detection Apparatus and Ultrasonic Flaw Detection Program |
| JP2008107165A (en) * | 2006-10-24 | 2008-05-08 | Nagoya Institute Of Technology | Ultrasonic flaw detection method |
| CN103954687A (en) * | 2014-04-14 | 2014-07-30 | 大连天亿软件有限公司 | Ultrasonic inspection method, ultrasonic inspection device and integrated longitudinal wave, transverse wave and creeping wave ultrasonic angle beam probe |
| RU2585304C1 (en) * | 2014-12-16 | 2016-05-27 | Дмитрий Анатольевич Князев | Transverse-longitudinal method for implementation of echo-ranging method for ultrasonic inspection of articles along whole section |
| CN204832115U (en) * | 2015-08-18 | 2015-12-02 | 广深铁路股份有限公司广州工务段 | Rail device of detecting a flaw |
| CN105259254A (en) * | 2015-11-12 | 2016-01-20 | 湖南高速铁路职业技术学院 | Scanning device for steel rail bottom transverse cracks |
| CN106053611A (en) * | 2016-05-25 | 2016-10-26 | 中国铁道科学研究院 | Wheel type probe capable of detecting rail bottoms |
| CN213843123U (en) * | 2020-11-28 | 2021-07-30 | 邢台超拓科技开发有限公司 | Trolley type ultrasonic flaw detection device for steel rails |
Non-Patent Citations (1)
| Title |
|---|
| 陈红冬, 熊亮, 邓宏平, 陈琳依: "厚壁大径管对接焊缝根部缺陷的一纵一横双探头超声波衍射法定性定量检测", 无损检测, vol. 30, no. 6, 10 June 2011 (2011-06-10), pages 30 - 34 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2277037B1 (en) | Method of and an apparatus for in situ ultrasonic rail inspection of a railroad rail | |
| CN101424664B (en) | Rail tread crack ultrasonic detection device and detecting method | |
| US6945114B2 (en) | Laser-air, hybrid, ultrasonic testing of railroad tracks | |
| US6715354B2 (en) | Flaw detection system using acoustic doppler effect | |
| US7882742B1 (en) | Apparatus for detecting, identifying and recording the location of defects in a railway rail | |
| US6862936B2 (en) | Laser-air, hybrid, ultrasonic testing of railroad wheels | |
| CN104359983B (en) | The center support system and method for a kind of steel rail flaw detection device | |
| RU2353924C1 (en) | Method for ultrasonic testing of rail base | |
| CN113960168A (en) | Method for detecting transverse cracks of rail bottom of steel rail | |
| RU2487809C2 (en) | Method of track and rolling stock diagnostics | |
| RU2645818C1 (en) | Method for ultrasonic inspection of rail bases | |
| CN109916908B (en) | System and method for detecting rail surface damage based on speckle photography technology | |
| CN207029202U (en) | A kind of left and right track pitch measuring | |
| RU2652511C1 (en) | Method of micro cracks on the rail head rolling surface ultrasonic detection | |
| CN113607823B (en) | Method for detecting longitudinal crack depth of cylindrical concrete by utilizing ultrasonic waves | |
| CN112014463A (en) | Steel rail acoustic flaw detection system and flaw detection method | |
| CN113640387A (en) | Railway thermite welding rib flaw detection method and railway thermite welding rib flaw detection device | |
| RU2783753C1 (en) | Ultrasonic method for detecting defects in the rail head | |
| RU2712975C1 (en) | Method of ultrasonic detection of longitudinal cracks in a rail head | |
| CN112014462A (en) | Rail flaw detection vehicle | |
| RU2785302C1 (en) | Ultrasonic method for assessing defects in the rail head and determining the profile of the tread surface | |
| RU2788475C1 (en) | Ultrasonic method for determining the parameters of the rolling surface of the rail head and the depth of longitudinal cracks | |
| RU2764571C1 (en) | Ultrasonic method for detecting and evaluating rail welded joints in high-speed inspection | |
| RU126141U1 (en) | DEVICE OF ULTRASONIC CONTROL OF HEAD AND NECK OF RAILS | |
| RU2774096C1 (en) | Method for dynamic adjustment of the sensitivity of flaw detection tools during high-speed testing of long objects |
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 |