CN114674929A - Small-angle flaw detection device and method based on double-probe-wheel structure - Google Patents
Small-angle flaw detection device and method based on double-probe-wheel structure Download PDFInfo
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- 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
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- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
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- B61K9/08—Measuring installations for surveying permanent way
- B61K9/10—Measuring installations for surveying permanent way for detecting cracks in rails or welds thereof
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a small-angle flaw detection device based on a double-probe-wheel structure, which comprises two double-probe-wheel structures and an ultrasonic detection host, wherein a plurality of probe signal output ends on the two double-probe-wheel structures are connected with the ultrasonic detection host; the double-probe wheel structure comprises two probe wheels and a steel frame structure for linking the two probe wheels, and the two probe wheels are distributed in a mirror image state in tandem; the advancing directions of the two detection wheels are consistent with the track, and the two detection wheels are arranged above the track on the same side to measure the damage condition of the track; a plurality of ultrasonic probes are arranged on the probe wheel, and at least comprise: 10 degree probe and 1 21.5 degree probe, wherein: the emission angle of the probe at 0 degree is vertically downward, and the probe can be used for self-emission and self-collection; the 21.5-degree probe emission angle of the front and rear probe wheels forms a 21.5-degree included angle with the vertical direction and inclines inwards, and the front probe wheel emits the rear probe wheel to be collected or the rear probe wheel emits the front probe wheel to be collected so as to detect small-angle damage smaller than 15 degrees in the steel rail with the vertical direction.
Description
Technical Field
The invention relates to a special flaw detection device for detecting the damage condition of a steel rail, which is arranged on a track, in particular to a small-angle flaw detection device and a small-angle flaw detection method based on a double-probe-wheel structure.
Background
The flaw detection device is widely applied to detecting the steel rails used by the conventional ordinary railways, high-speed railways, urban subways or light rails. At present, the flaw detection vehicle which is most widely applied is an ultrasonic flaw detector vehicle. The principle of ultrasonic detection is that an ultrasonic probe (piezoelectric wafer) in the probe vibrates according to its own natural vibration frequency after being excited by an ultrasonic emission signal (i.e., "high voltage pulse") emitted by the system. When the ultrasonic wave is transmitted in the steel rail and meets cracks, defects or cavities in the steel rail, part of ultrasonic wave energy is reflected back, and the reflected energy is received by the chip to be echo. The echoes obtained by various ultrasonic probes are converted into electric signals in the ultrasonic transducer, and finally displayed in an image form on a display control computer after analog processing, digital processing, space conversion and damage identification, so that the detection process of the damages of different parts and different forms of the steel rail is completed.
201910406338, X discloses a double track four-wheel flaw detection device based on ultrasonic waves, which comprises a flaw detection mechanism running on a double track, wherein two sides of the flaw detection mechanism are respectively provided with two detection wheels, an upper support and a lower support are arranged in the detection wheels, two sides of the upper support are respectively provided with a detection wheel shaft, one end of the lower support is provided with a first probe, a second probe and a third probe, the other end of the lower support is provided with a fourth probe, the middle position of the lower support is provided with a fifth probe, the first probe, the second probe and the third probe are arranged side by side and all incline towards the direction of the fourth probe, the fourth probe inclines towards the direction of the second probe, and the fifth probe inclines towards the ground. Compared with the prior art, the invention adopts the arrangement mode of four detection wheels and five probes in each detection wheel, can detect the nuclear damage of the head of the steel rail, the crack damage of the joint part of the steel rail, the rail web of the steel rail and the rail bottom of the steel rail in all directions, has more comprehensive ultrasonic coverage, avoids coupling interference and has better detection effect. In this application, 5 ultrasonic transducer all adopt parallel mode simultaneous emission and receipt ultrasonic wave, and every probe all receives the ultrasonic wave of the same probe transmission of self, because probe transmission and receiving angle limit, can't differentiate the crack that is less than the small angle of 15 degrees with vertical direction.
Disclosure of Invention
The invention provides a small-angle flaw detection device and method based on a double-probe wheel structure, aiming at the problem that the vertical small-angle cracks cannot be detected by the conventional double-rail type steel rail ultrasonic flaw detection vehicle. The specific technical scheme of the invention is as follows:
the invention discloses a small-angle flaw detection device based on a double-probe-wheel structure, which comprises two double-probe-wheel structures and an ultrasonic detection host, wherein a plurality of probe signal output ends on the two double-probe-wheel structures are connected with the ultrasonic detection host;
the double-probe wheel structure comprises two probe wheels and a steel frame structure for linking the two probe wheels, wherein the two probe wheels are distributed in a mirror image state in tandem; the advancing directions of the two detection wheels are consistent with the track, and the two detection wheels are arranged above the track on the same side to measure the damage condition of the track;
a plurality of ultrasonic probes are arranged on the probe wheel, and at least comprise: 10 degree probe and 1 21.5 degree probe, wherein: the emission angle of the probe at 0 degree is vertically downward, and the probe can be used for self-emission and self-collection; the 21.5-degree probe emission angle of the front and rear probe wheels forms a 21.5-degree included angle with the vertical direction and inclines inwards, and the front probe wheel sends out the rear probe wheel to be collected or the rear probe wheel sends out the front probe wheel to be collected so as to detect small-angle damage smaller than 15 degrees with the vertical direction in the steel rail.
Preferably, the center distance between the two probe wheels of the double-probe-wheel structure is 243.4mm, the center distance between the two 21.5-degree probes in the front and rear two wheels is 383.72mm, and the diameter of the probe wheel is 238 mm.
Preferably, the probe wheel includes probe array, bearing structure, probe array support, hub and coupling liquid, wherein:
the probe array comprises a plurality of ultrasonic probes and is arranged on the probe array bracket;
the probe array bracket is fixed on the bearing structure, and when the device works, the probe array bracket is always in a vertical state and is kept unchanged, so that the direction of the ultrasonic array is ensured to be unchanged;
the wheel leather is fixed by wheel leather pressing rings on two sides to form a closed cavity, and the probe array bracket are arranged in the closed cavity;
coupling liquid protection film sets up in the wheel skin inner wall, and the wheel skin outside sets up annotates the liquid mouth, annotates the tail end access wheel skin inside of liquid mouth, annotates coupling liquid from annotating liquid mouth and to the wheel skin in, guarantees that the ultrasonic wave does not propagate in the air to reduce ultrasonic energy loss.
Preferably, the probe array comprises 7 ultrasonic probes, which are respectively: 1 probe of 0 degree, 1 probe of 21.5 degrees, 3 straight 27 degrees probes and 1 forward slope 27 degree probes of left side, 1 backward slope 27 degree probe of right side can detect the damage of different positions and different trends in the rail.
Preferably, two are visited a round tandem and are the mirror image state and distribute to two are visited the from inside to outside direction of round structure, arrange in proper order on the single probe array: 1 straight 27 degree probe, 1 left forward oblique 27 degree probe, 10 degree probe, 1 right backward oblique 27 degree probe, 1 21.5 degree probe and 2 straight 27 degree probes;
wherein: the 0-degree probe is positioned in the center of the probe array; the 1 21.5-degree probe and the 2 straight 27-degree probes are arranged in parallel and positioned on the same straight line, and the straight line is vertical to the advancing direction of the probe wheel; 1 probe with 27 degrees of left-forward inclination, 1 probe with 0 degrees and 1 probe with 27 degrees of right-backward inclination are centrosymmetric, and the central point is the probe with 0 degrees; the included angle between the left forward inclined 27-degree probe and the vertical direction is 27 degrees, and the included angle between the left forward inclined 27-degree probe and the advancing direction of the probe wheel is 68 degrees.
Preferably, the coupling fluid is located within the wheel skin to create a pressure of 1.5 BAR.
The invention also discloses a small-angle flaw detection method based on the double-probe wheel structure, wherein the two probe wheels are respectively marked as a forward probe wheel and a backward probe wheel, the probe at 0 degree of the forward probe wheel is marked as A1, and the probe at 21.5 degree is marked as A2; the 0-degree probe of the backward probing wheel is B1, the 21.5-degree probe of the backward probing wheel is B2, and the specific small-angle flaw detection method comprises the following steps:
s1, the probe A1 and the probe B1 transmit ultrasonic waves in the front 10us and receive the ultrasonic waves reflected by the rail bottom of the steel rail by taking T1=20us as a period;
s2, the probe A2 and the probe B2 emit ultrasonic waves with the time difference of 250us and the period of T2=500 us; the first half cycle A2 transmits B2 reception, and the second half cycle B2 transmits A2 reception;
s3: calculating a backward attenuation ratio q1 and a forward attenuation ratio q2 of the signal based on the amplitude change of the received signal and the amplitude change of the transmitted signal;
s4: calculating the crack confidence level p = q1 q 2/[ 1-q1(1-q2) -q2(1-q1) ], through fusion reasoning;
s5: the crack reliability p is compared with a set threshold p0, if p is larger than p0, S6 is executed, otherwise, no crack is judged, and then the process is finished;
s6: calculating the T1=336/V in unit of millisecond, wherein V is the advancing speed of the small-angle flaw detection device in unit of meter/second; counting the total wave loss ratio w of the A1 probe and the B1 probe in T1 milliseconds;
s7, comparing the total wave-loss ratio w with a design threshold value w0, and judging the crack to be a large-angle crack if w is more than w 0; otherwise, judging that the small angle has no crack; and then ends.
Preferably, the attenuation ratio calculating method in step S2 includes:
q1= 1-PBr/PAs, wherein PBr is the B2 probe received signal amplitude and PAs is the A2 probe transmitted signal amplitude;
q2= 1-PAr/PBs, wherein PAr is the received signal amplitude of A2 probe and PBs is the transmitted signal amplitude of B2 probe.
The method for calculating the total loss wave ratio in the time T1 milliseconds in the step S5 includes:
w =1- (NAr + NBr)/(NAs + NBs), where NAs, NBs are the number of sound waves generated by the a1 probe, B1 probe, respectively, within T1 milliseconds; NAr, NBr are the number of sound waves received by the a1 probe and the B1 probe, respectively, within time T1 milliseconds.
The beneficial effects of the invention are as follows:
1) by adopting a double-probe-wheel structure, the current probe in the probe wheel is improved to only support a self-sending and self-receiving mode, partial probe signals are sent and received by separating probes, the height ratio of the distance between the transverse sending and receiving probes to the distance between the probe wheel and the surface of a track is effectively increased, and thus a vertical small-angle crack can be detected;
2) on the basis of detecting the reflected echo, the attenuation rate of the projected sound wave is introduced, and the reliability of the existence of cracks is calculated based on the two-way attenuation rate fusion reasoning, so that the existence of the cracks is judged more reliably and accurately;
3) each probe wheel is internally provided with 7 ultrasonic probes, so that the damage of a rail head, a rail web and a rail bottom can be effectively covered. Such as transverse crack of rail head, horizontal crack of rail web, screw hole crack, oblique crack of rail web, etc. The reasonable angle and position of the wafer inside the probe wheel ensure that the wafer inside the probe wheel has wide coverage, strong anti-interference capability and obviously improved detection rate.
Drawings
FIG. 1 is a schematic diagram of a small-angle flaw detection device based on a double-probe-wheel structure.
FIG. 2 is a schematic diagram of a probe wheel in the small-angle flaw detection device based on a double-probe-wheel structure.
FIG. 3 is an exploded view of the probe wheel of the small angle flaw detector based on the dual probe wheel structure of the present invention.
FIG. 4 is an exploded assembly view of a probe wheel in the small-angle flaw detection device based on a double-probe-wheel structure.
FIG. 5 is a flow chart of the small-angle flaw detection method based on the double-probe-wheel structure.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the ultrasonic detection system comprises two double-probe structures and an ultrasonic detection host, wherein a plurality of probe signal output ends on the two double-probe structures are linked with the ultrasonic detection host. The double-probe wheel structure comprises two probe wheels 1 and a steel frame structure 10 for linking the two probe wheels, and the two double-probe wheel structures are respectively positioned on two sides of the small-angle flaw detection device and used for measuring the damage condition of the corresponding track. Contain two in the two probe structures and visit wheel 1, be the mirror image state and distribute, the centre-to-centre spacing is 243.4mm to single probe to two probe structures from inside to outside direction, arrange in proper order on the single probe array: 1-3 straight 27-degree probes, 1-6 left forward oblique 27-degree probes, 1-1 0-degree probes, 1-7 right backward oblique 27-degree probes, 1-2 21.5-degree probes and 1-4 left straight 27-degree probes; the center distance between the two farthest probes (21.5-degree probes 1-2) in the front and back wheels is kept 383.72mm all the time.
As shown in fig. 2, the probe wheel includes a probe array, a bearing structure 2, a probe array support 3, a wheel 4 and a coupling liquid 5. The seven probes are 2-4MHz ultrasonic probes, wherein 1-1 is a 0-degree probe, is vertical to the surface of the steel rail and is used for detecting horizontal and oblique cracks between the rail head and the rail bottom; 1-2, a probe of 21.5 degrees, forming 21.5 degrees with the vertical direction, and being generally used for detecting screw hole cracks, inclined cracks, horizontal cracks of special parts and transverse cracks of the rail bottom in the projection range of the rail web; 1-3 are straight 27 degree probes for detecting the transverse cracks on the middle surface or the web of the head of the main detection steel rail; 1-4 is a left-side straight 27-degree probe, and 1-5 is a right-side straight 27-degree probe, and is used for detecting transverse cracks on two sides of the railhead and at the railjaw; the probe 1-6 is a probe with 27 degrees of forward inclination from the left, and the probe 1-7 is a probe with 27 degrees of backward inclination from the right, and is used for detecting the crack damage of the railjaw. The probe array bracket 3 is an ultrasonic wafer bracket; the wheel 4 is a coupling liquid protective film. Coupling liquid 5 with certain pressure is arranged in the wheel 4, so that ultrasonic waves are prevented from being transmitted in the air, and the energy loss of the ultrasonic waves is reduced.
The detailed construction assembly of the present invention is shown in fig. 3-4.
The middle probe array bracket 3 is fixedly and rigidly connected with 7 probes (a 0-degree probe 1-1, a 21.5-degree probe 1-2, a straight 27-degree probe 1-3, a left straight 27-degree probe 1-4, a right straight 27-degree probe 1-5, a left forward inclined 27-degree probe 1-6 and a right backward inclined 27-degree probe 1-7), and two side clamping holes of the probe array bracket 3 are fixedly and rigidly connected with a left sensor shaft 11, a right sensor shaft 11 and a valve side shaft 20.
The serial number 11 is a sensor shaft, the serial number 12 is an aerial plug wire holder, the aerial plug wire holder 12 is fixedly connected with the sensor shaft 11 by 4 screws, the serial number 13 is a dustproof ring to prevent dust from entering the bearing 14, and the outer ring of the bearing 14 is arranged on a liquid filling sideThe wheel disc 15 has a matching inner hole, so that the sensor shaft 11 and the liquid-filled side wheel disc 15 can make relative rotation movement after being connected through the bearing 14.
After the sensor shaft 11 is arranged in the liquid filling side wheel disc 15 through the bearing 14, the tail end of the sensor shaft 11 is arranged in the probe array bracket 3, and after the sensor shaft 11 is clamped through a clamping hole of the probe array bracket 3, the sensor shaft 11 and the probe array bracket 3 are rigidly and fixedly connected. The same applies to the valve-side shaft 20.
After the assembly of the sensor shaft 11 and the valve side shaft 20 and the assembly of the probe array bracket 3 are installed, the assembly of the sensor shaft 11 and the probe array bracket 3, the valve side shaft 20 and the assembly of the probe array bracket 3 form a rigid supporting structure, and the liquid filling side wheel disc 15 and the valve side wheel disc 19 can rotate due to the connection and the matching of the bearing 14 and the auxiliary bearing 21; the sub-bearing 21 side is provided with a sub-dust ring 22 to prevent dust from entering the sub-bearing 21.
The wheel 4 is pressed on the outer side planes of the liquid filling side wheel disc 15 and the valve side wheel disc 19 through a left wheel pressing ring 23 and a right wheel pressing ring 25, so that a closed space is formed inside the wheel 4, meanwhile, the wheel 4 is fixedly connected with the liquid filling side wheel disc 15 and the valve side wheel disc 19 in a pressing mode, the wheel 4 can make relative rotary motion with the sensor shaft 11, the probe array bracket 3 and the valve side shaft 20, and accordingly, the axle is fixed, and the wheel rotates and travels; the liquid filling side wheel disc 15 is provided with a liquid filling nozzle 16 for filling coupling liquid.
As shown in fig. 5, the small-angle flaw detection method based on the double-probe-wheel structure specifically includes the steps of:
the two probe wheels are respectively marked as a forward probe wheel and a backward probe wheel, the probe of 0 degree of the forward probe wheel is marked as A1, and the probe of 21.5 degrees is marked as A2; the 0-degree probe of the backward probing wheel is B1, the 21.5-degree probe of the backward probing wheel is B2, and the specific small-angle flaw detection method comprises the following steps:
s1, the probe A1 and the probe B1 transmit ultrasonic waves in the front 10us and receive the ultrasonic waves reflected by the rail bottom of the steel rail by taking T1=20us as a period;
s2, the probe A2 and the probe B2 emit ultrasonic waves with the time difference of 250us and the period of T2=500 us; the first half cycle A2 transmits B2 reception, and the second half cycle B2 transmits A2 reception;
s3: calculating a backward attenuation ratio q1 and a forward attenuation ratio q2 of the signal based on the amplitude change of the received signal and the amplitude change of the transmitted signal; the attenuation ratio calculation method comprises the following steps:
q1= 1-PBr/PAs, wherein PBr is the B2 probe received signal amplitude and PAs is the A2 probe transmitted signal amplitude;
q2= 1-PAr/PBs, wherein PAr is the received signal amplitude of A2 probe and PBs is the transmitted signal amplitude of B2 probe.
S4: calculating the crack confidence level p = q1 q 2/[ 1-q1(1-q2) -q2(1-q1) ], through fusion reasoning;
s5: comparing the crack reliability p with a set threshold p0, if p is greater than p0, executing S6, otherwise, judging that no crack exists, and then ending;
s6: calculating the T1=336/V in unit of millisecond, wherein V is the advancing speed of the small-angle flaw detection device in unit of meter/second; counting the total wave loss ratio w of the A1 probe and the B1 probe in T1 milliseconds; the method for calculating the total loss-to-wave ratio in T1 milliseconds comprises the following steps:
w =1- (NAr + NBr)/(NAs + NBs), where NAs, NBs are the number of sound waves generated by the a1 probe, B1 probe, respectively, within T1 milliseconds; NAr, NBr are the number of sound waves received by the a1 probe and the B1 probe, respectively, within time T1 milliseconds.
S7, comparing the total wave-loss ratio w with a design threshold value w0, and judging the crack to be a large-angle crack if w is more than w 0; otherwise, judging that the small angle has no crack; and then ends.
Example (c):
if q1=0.8 and q2=0.6 in the above step S3, the step S3 may include:
p= q1*q2/ [1-q1(1-q2)-q2(1-q1)]=0.857
if in S5, p0=0.85, then the execution is switched to S6;
and (3) counting the total wave loss ratio of the A1 and B1 probes when the flaw detection transfer operation speed is V =2 m/S and T =336/2=168 milliseconds, and judging the large-angle crack according to the step S7 if the wave loss ratio w =2% and the threshold value w0= 1%.
Claims (9)
1. A small-angle flaw detection device based on a double-probe-wheel structure is characterized by comprising two double-probe-wheel structures and an ultrasonic detection host, wherein a plurality of probe signal output ends on the two double-probe-wheel structures are connected with the ultrasonic detection host;
the double-probe wheel structure comprises two probe wheels and a steel frame structure for linking the two probe wheels, wherein the two probe wheels are distributed in a mirror image state in tandem; the advancing directions of the two detection wheels are consistent with the track, and the two detection wheels are arranged above the track on the same side to measure the damage condition of the track;
a plurality of ultrasonic probes are arranged on the probe wheel, and at least comprise: 10 degree probe and 1 21.5 degree probe, wherein: the emission angle of the probe at 0 degree is vertically downward, and the probe can be used for self-emission and self-collection; the 21.5-degree probe emission angle of the front and rear probe wheels forms a 21.5-degree included angle with the vertical direction and inclines inwards, and the front probe wheel emits the rear probe wheel to be collected or the rear probe wheel emits the front probe wheel to be collected so as to detect small-angle damage smaller than 15 degrees in the steel rail with the vertical direction.
2. The apparatus of claim 1, wherein the center-to-center distance between the two probe wheels of the dual probe wheel configuration is 243.4mm, the center-to-center distance between the two 21.5 degree probes in the front and rear two wheels is 383.72mm, and the diameter of the probe wheels is 238 mm.
3. The apparatus of claim 1, wherein the probe wheel comprises a probe array, a bearing structure, a probe array support, a wheel skin, and a coupling fluid, wherein:
the probe array comprises a plurality of ultrasonic probes and is arranged on the probe array bracket;
the probe array bracket is fixed on the bearing structure, and when the device works, the probe array bracket is always in a vertical state and keeps unchanged, so that the direction of the ultrasonic array is ensured to be unchanged;
the wheel leather is fixed by wheel leather pressing rings on two sides to form a sealed cavity, and the probe array bracket are arranged in the sealed cavity;
coupling liquid protection film sets up in the wheel skin inner wall, and the wheel skin outside sets up annotates the liquid mouth, annotates the tail end access wheel skin inside of liquid mouth, annotates coupling liquid from annotating liquid mouth and to the wheel skin in, guarantees that the ultrasonic wave does not propagate in the air to reduce ultrasonic energy loss.
4. The apparatus of claim 3, wherein the probe array comprises 7 ultrasound probes, each of which is: 1 probe of 0 degree, 1 probe of 21.5 degrees, 3 straight 27 degrees probes and 1 probe of forward slope 27 degrees of left side, 1 probe of backward slope 27 degrees of right side.
5. The apparatus according to claim 3, wherein the two probe wheels are arranged in a mirror image state in tandem, and the single probe array is sequentially arranged in the inside-out direction of the double probe wheel structure: 1 straight 27 degree probe, 1 left forward oblique 27 degree probe, 10 degree probe, 1 right backward oblique 27 degree probe, 1 21.5 degree probe and 2 straight 27 degree probes;
wherein: the 0-degree probe is positioned in the center of the probe array; the 1 21.5-degree probe and the 2 straight 27-degree probes are arranged in parallel and positioned on the same straight line, and the straight line is vertical to the advancing direction of the probe wheel; 1 probe inclined forward by 27 degrees, 1 probe inclined backward by 0 degrees and 1 probe inclined backward by 27 degrees are in central symmetry, and the central point is the probe inclined backward by 0 degrees; the included angle between the left forward inclined 27-degree probe and the vertical direction is 27 degrees, and the included angle between the left forward inclined 27-degree probe and the advancing direction of the probe wheel is 68 degrees.
6. The apparatus of claim 1, wherein the coupling fluid is disposed within the wheel skin to provide a pressure of 1.5 BAR.
7. A small-angle flaw detection method based on a double-probe wheel structure is characterized in that two probe wheels are respectively marked as a forward probe wheel and a backward probe wheel, a probe at 0 degree of the forward probe wheel is marked as A1, and a probe at 21.5 degree is marked as A2; the 0-degree probe of the backward probing wheel is B1, the 21.5-degree probe of the backward probing wheel is B2, and the specific small-angle flaw detection method comprises the following steps:
s1, the probe A1 and the probe B1 transmit ultrasonic waves in the front 10us and receive the ultrasonic waves reflected by the rail bottom of the steel rail by taking T1=20us as a period;
s2, the probe A2 and the probe B2 emit ultrasonic waves with the time difference of 250us and the period of T2=500 us; the first half cycle A2 transmits B2 reception, and the second half cycle B2 transmits A2 reception;
s3: calculating a backward attenuation ratio q1 and a forward attenuation ratio q2 of the signal based on the amplitude change of the received signal and the amplitude change of the transmitted signal;
s4: calculating the crack confidence level p = q1 q 2/[ 1-q1(1-q2) -q2(1-q1) ], through fusion reasoning;
s5: the crack reliability p is compared with a set threshold p0, if p is larger than p0, S6 is executed, otherwise, no crack is judged, and then the process is finished;
s6: calculating the T1=336/V in unit of millisecond, wherein V is the advancing speed of the small-angle flaw detection device in unit of meter/second; counting the total wave loss ratio w of the A1 probe and the B1 probe in T1 milliseconds;
s7, comparing the total wave-loss ratio w with a design threshold value w0, and judging the crack to be a large-angle crack if w is more than w 0; otherwise, judging that the small angle has no crack; and then ends.
8. The method as claimed in claim 7, wherein the attenuation ratio calculating method in step S2 is:
q1= 1-PBr/PAs, wherein PBr is the B2 probe received signal amplitude and PAs is the A2 probe transmitted signal amplitude;
q2= 1-PAr/PBs, wherein PAr is the received signal amplitude of A2 probe and PBs is the transmitted signal amplitude of B2 probe.
9. The method as claimed in claim 7, wherein the total loss-to-noise ratio in the time T1 milliseconds in the step S5 is calculated by:
w =1- (NAr + NBr)/(NAs + NBs), where NAs, NBs are the number of sound waves generated by the a1 probe, B1 probe, respectively, within T1 milliseconds; NAr, NBr are the number of sound waves received by the a1 probe and the B1 probe, respectively, within time T1 milliseconds.
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| CN118062520A (en) * | 2024-04-25 | 2024-05-24 | 广东汕头超声电子股份有限公司 | Detection system for longitudinal tear crack of mineral conveyor belt |
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| CN103868997A (en) * | 2012-12-12 | 2014-06-18 | 南车洛阳机车有限公司 | Small-angle longitudinal wave flaw detection scanning rack for railway locomotive axle |
| CN206107259U (en) * | 2016-08-31 | 2017-04-19 | 珠海启世机械设备股份有限公司 | Wheeled defectoscope of belt constructs |
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| GB621839A (en) * | 1943-11-01 | 1949-04-21 | Sperry Gyroscope Co Inc | Improvements in and relating to directive antenna systems |
| JP2005106654A (en) * | 2003-09-30 | 2005-04-21 | Hitachi Ltd | Automatic inspection system |
| CN103868997A (en) * | 2012-12-12 | 2014-06-18 | 南车洛阳机车有限公司 | Small-angle longitudinal wave flaw detection scanning rack for railway locomotive axle |
| CN103675101A (en) * | 2013-12-24 | 2014-03-26 | 南车青岛四方机车车辆股份有限公司 | Ultrasound flaw detection method, device and system for intercity train solid wheel pair with gear box |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118062520A (en) * | 2024-04-25 | 2024-05-24 | 广东汕头超声电子股份有限公司 | Detection system for longitudinal tear crack of mineral conveyor belt |
| CN118062520B (en) * | 2024-04-25 | 2024-06-25 | 广东汕头超声电子股份有限公司 | Detection system for longitudinal tear crack of mineral conveyor belt |
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| CN114674929B (en) | 2022-08-30 |
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