Ultrasonic flaw detection auxiliary device for steel plate and use method of ultrasonic flaw detection auxiliary device

Abstract

The invention belongs to the technical field of ultrasonic flaw detection, and particularly discloses an ultrasonic flaw detection auxiliary device for a steel plate, which comprises five test blocks, a set rule I and an ultrasonic probe, the five test blocks are in a step shape, V-shaped grooves are formed in the test blocks, a clamping groove is formed in the long vertical beam end of the set rule I, the ultrasonic probe is clamped with the clamping groove, the set rule I is in a cross shape, and the set rule I is connected with the ultrasonic probe. Five limiting strip holes are formed in the short vertical beam end of the first positioning ruler, second positioning rulers are arranged in the limiting strip holes, triangular prism holes are formed in the second positioning ruler and the first positioning ruler, limiting pins are arranged in the triangular prism holes, and limiting assemblies are arranged on the limiting pins; after the positions of the first positioning ruler and the second positioning ruler are determined, the ultrasonic probe is clamped into the clamping groove, the auxiliary device is pulled out, and the detection point is directly determined through the auxiliary device, so that the practicability and the detection rate of ultrasonic detection are improved, and the problem that when steel plates made of the same material and non-uniform in thickness need to be tested, a found test block needs to be turned over or the detection point needs to be calculated for multiple times is solved. And the detection efficiency and precision are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic flaw detection, and in particular to an ultrasonic flaw detection auxiliary device for steel plates and a method for using the device. Background Art

[0002] Ultrasonic testing is an industrial non-destructive testing technology that uses high-frequency sound waves to penetrate the interior of materials and analyze the reflected or transmitted sound wave signals (such as echo amplitude, propagation time and waveform characteristics) to non-destructively detect internal defects (such as cracks, pores, inclusions), structural anomalies or measure material thickness. Its core process is: the probe emits sound wave pulses, receives echoes reflected from defects or interfaces, and the instrument converts the signals into visual waveforms, thereby locating the defect position, assessing the size and determining the nature. Among them, ultrasonic flaw detection test blocks are standard reference objects used to calibrate instruments, calibrate detection sensitivity and establish quantitative benchmarks for defects. Their core function is to provide reproducible acoustic responses under the same detection conditions through preset artificial defects (such as flat-bottom holes and transverse through holes) or specific geometric structures, thereby compensating for material attenuation (such as drawing DAC curves), verifying probe performance, and unifying detection standards. Although test blocks are indispensable, their design and use have inherent deficiencies: the artificial defects prefabricated in the test blocks (such as flat-bottom holes and transverse holes) have regular shapes, resulting in reduced detection accuracy; when it is necessary to test steel plates of the same material but different thicknesses, it is necessary to find the corresponding test blocks and calculate the test points multiple times, which reduces detection efficiency and accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide an ultrasonic flaw detection auxiliary device for steel plates to solve the problem that when testing steel plates of the same material but different thicknesses, it is necessary to find the corresponding test blocks and calculate the test points multiple times, resulting in reduced detection efficiency and accuracy.

[0004] In order to achieve the above-mentioned purpose, the basic scheme provided by the present invention is: an ultrasonic flaw detection auxiliary device for steel plates, comprising five test blocks, a positioning ruler 1 and an ultrasonic probe, the five test blocks are arranged in a stepped manner, each test block is provided with a V-groove, each layer of V-grooves is staggered with adjacent V-grooves, the ultrasonic probe is located on the test block, the positioning ruler 1 is in the shape of a cross, a card slot is provided at the long vertical beam end of the positioning ruler 1, the ultrasonic probe and the card slot are clamped, five limit bar holes are provided at the short vertical beam end of the positioning ruler 1, the positioning ruler 2 is clamped in the limit bar hole, and a triangular prism hole is provided at the intersection of the positioning ruler 2 and the positioning ruler 1, a limit pin is movably passed through the triangular prism hole, and the limit pin is provided with a limit component for fixing the limit pin.

[0005] The principle and beneficial effect of the present invention are as follows: before use, the corresponding test block is first determined according to the steel plate to be tested, and then the corresponding limit bar hole is determined according to the thickness of the test block, and then the positioning ruler 2 is inserted into the corresponding limit bar hole, so that the corresponding triangular prism holes on the positioning ruler 1 and the positioning ruler 2 coincide with each other, and then the positioning ruler 1 and the positioning ruler 2 are fixed by the limit assembly; the edges and corners of the triangular prism hole provide precise geometric positioning points to reduce positioning errors. When in use, first apply coupling agent on the surface of the test block, and then the short crossbeam end of the positioning ruler 1 is pressed against the adjacent test block, so that the positioning ruler 1 and the positioning ruler 2 are tightly fitted to the side and surface of the test block respectively, and then the ultrasonic probe is inserted. The head is inserted into the slot. At this time, the ultrasonic probe determines the position, and then the positioning ruler 1 and the positioning ruler 2 are pulled out, and the ultrasonic probe can emit ultrasonic waves for detection. The device fixes and connects the commonly used test blocks of the same material together to reduce the time of finding the test blocks. The prefabricated V-grooves on adjacent test blocks are staggered. If the prefabricated V-grooves on adjacent test blocks are on the same side, the V-grooves of adjacent test blocks will affect the test results during ultrasonic testing. Therefore, staggered arrangement of the V-grooves on adjacent test blocks can increase the accuracy of ultrasonic testing. When it is necessary to determine the detection point of the ultrasonic probe, the detection point can be directly determined by the auxiliary device without the need for calculation, thereby improving the practicality and detection rate of ultrasonic testing.

[0006] Option 2, which is the preferred option of the basic option, the limit assembly includes limit slot 1 and limit slot 2, which are located at both ends of the limit pin, a spring is fixed in limit slot 1, a block is fixed on the spring, a main shaft is rotatably connected in limit slot 2, a clamp is fixed on the main shaft, a torsion spring is fixed on the side of the clamp, the other end of the torsion spring is against limit slot 2, and the block and the clamp are both against positioning ruler 1; when in use, the limit pin passes through positioning ruler 1, positioning ruler 2 and positioning ruler 1 in sequence, when the block When the movement passes through the positioning ruler 1, the spring is subjected to downward pressure, so that the blocking block is pressed into the limiting groove 1. At this time, the clamping block is in an upward flip-up state due to the torsion spring. When the positioning ruler 1 passes through the positioning ruler 1, the spring relaxes, driving the blocking block to pop out, so that the positioning ruler 1 is stuck between the blocking block and the clamping block, limiting the positioning ruler 1 and the positioning ruler 2. The edges and corners of the triangular prism hole provide precise positioning points, reducing positioning errors. The blocking block and the clamping block automatically clamp the positioning ruler 1. The component is easy to operate.

[0007] Option three is the preferred option of the basic option. The top of the limit pin near the limit groove one is in the shape of a triangular pyramid. The top of the triangular pyramid is convenient for passing through the triangular prism hole, which reduces the difficulty of operation and improves the operation efficiency.

[0008] Option 4 is the preferred option for the basic option. Each test block is 220 mm long and 50 mm wide. The thicknesses of the five test blocks are 16.4 mm, 20 mm, 24.4 mm, 29.8 mm, and 36.4 mm, respectively. The depths of the V-grooves in the five test blocks are 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm, and 1.1 mm, respectively. The V-groove is 30 mm away from the edge of the test block. The V-groove is 30 mm long and 0.5 mm wide. The limit bars are located at the short vertical beam end of the positioning ruler 1, and the card slot is located at the long vertical beam end of the positioning ruler 1. The distances between the five limit bars and the card slot are 63.3 mm, 70.5 mm, 79.3 mm, 90.1 mm, and 103.3 mm, respectively. The depth calculation formula for the V-groove is: H depth = 3%·h 厚 , where H 深 is the V-groove depth, h 厚 is the thickness of the test block. When the ultrasonic probe is at the secondary reflection wave detection point, the calculation formula for the distance between the limit bar hole and the card slot is: L = 2·h 厚 +l v +l, where L is the distance between the limit bar hole and the card slot, h 厚 is the thickness of the test block, l v is the width of the V-groove, l is the distance between the V-groove and the edge of the test block, and when the ultrasonic probe is at the fourth reflected wave detection point, the calculation formula for the distance between the limit bar hole and the card slot is: L = 4·h 厚 +l v +l, where L is the distance between the limit bar hole and the card slot, h 厚 is the thickness of the test block, l v is the width of the V-groove, l is the distance between the V-groove and the edge of the test block, and the distances between the five limit bar holes and the card slot are 96.1mm, 110.5mm, 128.1mm, 149.7mm and 176.1mm respectively.

[0009] Solution 5, which is a basic solution, is a method for using an ultrasonic flaw detection auxiliary device for steel plates, comprising the following steps:

[0010] S1. The operator first uses a CSK-IA test block to measure the ultrasonic probe multiple times. The average of these measurements is used as the actual incident point and refraction angle. The actual incident point and refraction angle are then compared with the incident point and refraction angle of the ultrasonic probe to determine the correct incident point and refraction angle.

[0011] S2. After verifying the incident point and refraction angle, the operator applies coupling agent to the surface of the test block. Adjust the height of Positioning Ruler 1 on Positioning Ruler 2 until it is at the same height as the test block. Then, place the short crossbar of Positioning Ruler 1 against the adjacent test block and place the ultrasonic probe in the slot to determine the detection point of the secondary reflection wave.

[0012] S3. After the detection point of the secondary reflection wave is determined, remove the positioning rulers 1 and 2, and transmit the ultrasonic probe toward the V-groove, adjusting the ultrasonic incident angle according to the beam coverage width;

[0013] S4. After the ultrasonic incident angle is determined, the ultrasonic probe transmits the ultrasonic wave. When the ultrasonic wave contacts the V-groove, it generates a secondary reflection wave. The ultrasonic probe receives the secondary reflection wave and uses an oscilloscope to determine the maximum amplitude of the secondary reflection defect wave.

[0014] S5. After the maximum value of the secondary reflection defect wave amplitude is determined, repeat step S2 to determine the detection point of the fourth reflection wave, then repeat step S4 to obtain the maximum value of the fourth reflection defect wave amplitude. The maximum value of the secondary reflection defect wave amplitude and the maximum value of the fourth reflection defect wave amplitude are connected to obtain the DAC curve;

[0015] S6. After determining the DAC curve, the ultrasonic probe is used to detect the steel plate to be tested, and the reflected wave of the steel plate to be tested is observed through an oscilloscope. If the peak value of the reflected wave from the steel plate to be tested is higher than the DAC curve, the steel plate to be tested is unqualified; if the peak value of the reflected wave from the steel plate to be tested is lower than the DAC curve, the steel plate to be tested is qualified.

[0016] Solution 6, which is a preferred solution of Solution 5, the steps for adjusting the ultrasonic incident angle in step S3 are:

[0017] A. Launch ultrasonic waves toward the V-groove, with the initial ultrasonic incident angle being 45°;

[0018] B. With the probe as the center, slowly move the probe perpendicular to the acoustic beam while observing the echo amplitude on the oscilloscope. When the echo amplitude drops to half of the maximum value at the center, mark the probe's current position. The distance between the two boundaries is the acoustic beam coverage width at that location.

[0019] C. The width of the sound beam coverage determines whether the ultrasonic probe half-divergence angle needs to be adjusted. The calculation formula for the half-divergence angle is:

[0020]

[0021] , where θ is the half-diffusion angle, λ is the wavelength of the ultrasonic wave in the test block, b is the length of the short side of the oblique probe wafer, and β is the refraction angle.

[0022] Solution 7, which is a preferred solution of Solution 6, in step C, the method for determining whether the ultrasonic probe half-angle of diffusion needs to be adjusted is as follows:

[0023] C1. First, calculate the vertical distance of the sound beam spread based on the half-diffusion angle of the ultrasonic probe. The calculation formula for the vertical distance of the sound beam spread is: dvertical = 4·h 厚 tanα, where d 垂is the vertical distance of the sound beam diffusion, hthick is the thickness of the test block, and α is the half diffusion angle of the ultrasonic probe (15);

[0024] C2. After determining the vertical distance of the sound beam spread, compare it with the spacing between adjacent V-grooves on the same side. If the vertical distance is less than the spacing between adjacent V-grooves on the same side, there is no need to adjust the half-divergence angle. If the vertical distance is greater than or equal to the spacing between adjacent V-grooves on the same side, the half-divergence angle needs to be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a perspective view of an ultrasonic flaw detection auxiliary device for steel plates according to the present invention;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is an exploded view of a latch in an auxiliary device for ultrasonic flaw detection of steel plates according to the present invention;

[0028] Figure 4 The utility model is a schematic diagram of the installation of an ultrasonic flaw detection auxiliary device for steel plates according to the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below through specific embodiments:

[0030] The reference numerals in the drawings of the specification include: 1. test block, 2. V-groove, 3. Positioning ruler 1, 4. Positioning ruler 2, 5. Limit bar hole, 6. Triangular prism hole, 7. Limit pin, 8. Slot, 9. Limit slot 1, 10. Limit slot 2, 11. Block, 12. Spring, 13. Block, 14. Torsion spring, 15. Ultrasonic probe, 17. Spindle.

[0031] Example 1

[0032] like Figures 1 to 3As shown: An ultrasonic flaw detection auxiliary device for steel plates, including five test blocks, a positioning ruler and an ultrasonic probe, the ultrasonic probe model is a 2.5P10×12K1 oblique probe, each test block is 220mm long and 50mm wide, the thickness of the five test blocks are 16.4mm, 20mm, 24.4mm, 29.8mm and 36.4mm respectively, the five test blocks are arranged in a stepped manner, each test block is provided with a V-groove, each layer of V-grooves is staggered with adjacent V-grooves, the depths of the V-grooves in the five test blocks are 0.5mm, 0.6mm, 0.7mm, 0.9mm and 1.1mm respectively, the V-groove is 30mm away from the edge of the test block, the V-groove is 30mm long and 0.5mm wide, the ultrasonic probe is located on the test block, the positioning ruler is in the shape of a cross, the long vertical beam end of the positioning ruler is provided with a slot, the ultrasonic probe and the slot are snapped together, and the short vertical beam end of the positioning ruler is opened. There are five limit bar holes, which are located in sequence at the short vertical beam end of the positioning ruler one, and the card slot is located at the long vertical beam end of the positioning ruler one. The distances between the five limit bar holes and the card slot are 63.3mm, 70.5mm, 79.3mm, 90.1mm and 103.3mm respectively. The positioning ruler two is connected in the limit bar hole. There is a triangular prism hole at the intersection of the positioning ruler two and the positioning ruler one. The triangular prism hole is movable through the limit pin, and the limit pin is close to the limit slot. The top of one is in the shape of a triangular pyramid, and a limit assembly for fixing the limit pin is provided on the limit pin, and the limit assembly includes limit slot one and limit slot two, and limit slot one and limit slot two are located at both ends of the limit pin, a spring is fixedly connected in limit slot one, a blocking block is fixed on the spring, a main shaft is rotatably connected in limit slot two, a clamping block is fixed on the main shaft, a torsion spring is fixed on the side of the clamping block, and the other end of the torsion spring is against limit slot two, and the blocking block and the clamping block are both against positioning ruler one.

[0033] The implementation method of this embodiment is as follows: before use, first determine the test block according to the steel plate to be tested, then determine the corresponding limit bar hole according to the thickness of the test block, then insert the positioning ruler 2 into the corresponding limit bar hole, so that the corresponding triangular prism holes on the positioning ruler 1 and the positioning ruler 2 coincide with each other, and then fix the positioning ruler 1 and the positioning ruler 2 through the limit assembly; when in use, first apply coupling agent on the surface of the test block, then press the short crossbeam end of the positioning ruler 1 against the adjacent test block, so that the positioning ruler 1 and the positioning ruler 2 are tightly fitted with the side and surface of the test block respectively, and then insert the ultrasonic probe into the slot. At this time, the ultrasonic probe determines the position, and then the positioning ruler 1 and the positioning ruler 2 are pulled out, and ultrasonic waves can be emitted by the ultrasonic probe for detection.

[0034] The formula for calculating the depth of the V-groove is: H depth = 3% h 厚 , where H 深 is the V-groove depth, h 厚 is the thickness of the test block. When the ultrasonic probe is at the secondary reflection wave detection point, the calculation formula for the distance between the limit bar hole and the card slot is: L = 2·h 厚 +l v+l, where L is the distance between the limit bar hole and the card slot, h 厚 is the thickness of the test block, l v is the width of the V-groove, l is the distance between the V-groove and the edge of the test block, and when the ultrasonic probe is at the fourth reflected wave detection point, the calculation formula for the distance between the limit bar hole and the card slot is: L = 4·h 厚 +l v +l, where L is the distance between the limit bar hole and the card slot, h 厚 is the thickness of the test block, l v is the width of the V-groove, l is the distance between the V-groove and the edge of the test block, and the distances between the five limit bar holes and the card slot are 96.1mm, 110.5mm, 128.1mm, 149.7mm and 176.1mm respectively

[0035] Example 2

[0036] like Figure 4 As shown: A method for using an ultrasonic flaw detection auxiliary device for steel plates, comprising the following steps:

[0037] S1. The operator first uses a CSK-IA test block to measure the ultrasonic probe multiple times. The average of these measurements is used as the actual incident point and refraction angle. The actual incident point and refraction angle are then compared with the incident point and refraction angle of the ultrasonic probe to determine the correct incident point and refraction angle.

[0038] S2. After verifying the incident point and refraction angle, the operator applies coupling agent to the surface of the test block. Adjust the height of Positioning Ruler 1 on Positioning Ruler 2 until it is at the same height as the test block. Then, place the short crossbar of Positioning Ruler 1 against the adjacent test block and place the ultrasonic probe in the slot to determine the detection point of the secondary reflection wave.

[0039] S3. After determining the detection point for the secondary reflection wave, remove the first and second positioning rulers. The ultrasonic probe transmits ultrasonic waves in the direction of the V-groove. Adjust the ultrasonic incident angle based on the beam width. The steps for adjusting the ultrasonic incident angle are as follows:

[0040] A. Launch ultrasonic waves toward the V-groove, with the initial ultrasonic incident angle being 45°;

[0041] B. With the probe as the center, slowly move the probe perpendicular to the acoustic beam while observing the echo amplitude on the oscilloscope. When the echo amplitude drops to half of the maximum value at the center, mark the probe's current position. The distance between the two boundaries is the acoustic beam coverage width at that location.

[0042] C. Determine whether the ultrasonic probe half-angle of diffusion needs to be adjusted based on the width of the sound beam coverage. The method for determining whether the ultrasonic probe half-angle of diffusion needs to be adjusted is as follows:

[0043] C1. First, calculate the vertical distance of the sound beam spread based on the half-diffusion angle of the ultrasonic probe. The calculation formula for the vertical distance of the sound beam spread is: dvertical = 4·h 厚 tanα, where d 垂 is the vertical distance of the sound beam diffusion, hthick is the thickness of the test block, and α is the half-diffusion angle of the ultrasonic probe;

[0044] C2. After determining the vertical distance of the sound beam spread, compare the vertical distance with the spacing between adjacent V-grooves on the same side. If the vertical distance is less than the spacing between adjacent V-grooves on the same side, there is no need to adjust the half-divergence angle. If the vertical distance is greater than or equal to the spacing between adjacent V-grooves on the same side, the half-divergence angle needs to be adjusted. The formula for calculating the half-divergence angle is:

[0045]

[0046] , where θ is the half-diffusion angle, λ is the wavelength of the ultrasonic wave in the test block, b is the length of the short side of the oblique probe wafer, and β is the refraction angle;

[0047] S4. After the ultrasonic incident angle is determined, the ultrasonic probe transmits the ultrasonic wave. When the ultrasonic wave contacts the V-groove, it generates a secondary reflection wave. The ultrasonic probe receives the secondary reflection wave and uses an oscilloscope to determine the maximum amplitude of the secondary reflection defect wave.

[0048] S5. After the maximum value of the secondary reflection defect wave amplitude is determined, repeat step S2 to determine the detection point of the fourth reflection wave, then repeat step S4 to obtain the maximum value of the fourth reflection defect wave amplitude. The maximum value of the secondary reflection defect wave amplitude and the maximum value of the fourth reflection defect wave amplitude are connected to obtain the DAC curve;

[0049] S6. After determining the DAC curve, the ultrasonic probe is used to detect the steel plate to be tested, and the reflected wave of the steel plate to be tested is observed through an oscilloscope. If the peak value of the reflected wave from the steel plate to be tested is higher than the DAC curve, the steel plate to be tested is unqualified; if the peak value of the reflected wave from the steel plate to be tested is lower than the DAC curve, the steel plate to be tested is qualified.

[0050] The implementation method of this embodiment is as follows: before the test, the operator first uses the CSK-IA test block to measure the ultrasonic probe multiple times. The measurement method is as follows: place the probe on the CSK-IA test block, with the incident point mark direction of the probe roughly facing the R100mm arc circle of the test block, select a suitable range on the instrument, move the probe back and forth parallel to each other while observing the reflected wave on the screen, find the highest echo of the R100 arc reflected wave, when the echo reaches the highest, fix the probe and measure the incident point with a ruler or vernier caliper, then move slightly on both sides of the probe mark line, find the highest wave and measure it several times, take the average value as the final front length value, take the average of the multiple measurement results as the actual incident point and refraction angle, compare the actual incident point and refraction angle with the incident point and refraction angle of the ultrasonic probe respectively, and obtain the correct incident point and refraction angle. The operator Apply coupling agent and adjust the height of positioning ruler 1 on positioning ruler 2. The height of positioning ruler 1 should be the same as that of the test block. Then, place the short crossbeam end of positioning ruler 1 against the adjacent test block. Then, place the ultrasonic probe in the slot to determine the detection point of the secondary reflection wave. Remove positioning rulers 1 and 2. The ultrasonic probe transmits ultrasonic waves in the direction of the V-groove. The initial ultrasonic incident angle is 45°. With the probe as the center, slowly move the probe in the direction perpendicular to the sound beam while observing the echo amplitude on the oscilloscope. When the echo amplitude drops to half of the maximum value at the center, mark the current position of the probe. The distance between the two side boundaries is the sound beam coverage width at that location. The sound beam coverage width is used to determine whether the angle of the ultrasonic probe half-diffusion angle needs to be adjusted. First, calculate the vertical distance of the sound beam diffusion based on the half-diffusion angle of the ultrasonic probe. The calculation formula for the vertical distance of the sound beam diffusion is: dvertical = 4·h 厚 tanα, where d 垂 is the vertical distance of the sound beam diffusion, hthick is the thickness of the test block, and α is the half-diffusion angle of the ultrasonic probe. After determining the vertical distance of the sound beam diffusion, compare the vertical distance of the sound beam diffusion with the spacing of adjacent V-grooves on the same side. If the vertical distance of the sound beam diffusion is less than the spacing of adjacent V-grooves on the same side, there is no need to adjust the half-diffusion angle; if the vertical distance of the sound beam diffusion is greater than or equal to the spacing of adjacent V-grooves on the same side, the half-diffusion angle needs to be adjusted. The calculation formula for the half-diffusion angle is:

[0051]

[0052] , where θ is the half-diffusion angle, λ is the wavelength of the ultrasonic wave in the test block, b is the short side length of the oblique probe chip, and β is the refraction angle; as shown in Table 1 below, the thickness range of the steel plate that can be detected by the stepped test block is:

[0053] Table 1 The thickness range of steel plates that can be detected by the stepped test block

[0054]

[0055]

[0056] During the detection, ultrasonic waves are emitted, and after the ultrasonic waves contact the V-shaped groove (2), secondary reflected waves are generated. The ultrasonic probe receives the secondary reflected waves, and the maximum value of the secondary reflected defect wave amplitude is determined by an oscilloscope. Step S2 is repeated to determine the detection point of the fourth reflected wave, and then step S4 is repeated to obtain the maximum value of the fourth reflected defect wave amplitude. The maximum value of the secondary reflected defect wave amplitude and the maximum value of the fourth reflected defect wave amplitude are connected to obtain a DAC curve. The ultrasonic probe is then used to perform flaw detection on the steel plate to be tested, and the reflected wave of the steel plate to be tested is observed by an oscilloscope. If the peak value of the reflected wave of the steel plate to be tested is higher than the DAC curve, the steel plate to be tested is unqualified; if the peak value of the reflected wave from the steel plate to be tested is lower than the DAC curve, the steel plate to be tested is qualified.

[0057] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An ultrasonic flaw detection auxiliary device for steel plates, characterized in that: The invention comprises five test blocks (1), a positioning ruler (3) and an ultrasonic probe (15), wherein the five test blocks (1) are arranged in a stepped manner, each test block (1) is provided with a V-shaped groove (2), and each layer of the V-shaped grooves (2) is arranged in a staggered manner with adjacent V-shaped grooves (2), the ultrasonic probe (15) is located on the test block (1), the positioning ruler (3) is in a cross shape, and a slot (8) is provided at the end of the long vertical beam of the positioning ruler (3). The ultrasonic probe (15) is snap-fitted to the slot (8); the short vertical beam end of the positioning ruler (3) is provided with five limit bar holes (5); the positioning ruler (4) is snap-fitted into the limit bar holes (5); the intersection of the positioning ruler (4) and the positioning ruler (3) is provided with a triangular prism hole (6); a limit pin (7) is movably passed through the triangular prism hole (6); and a limit assembly for fixing the limit pin (7) is provided on the limit pin (7).

2. The ultrasonic flaw detection auxiliary device for steel plates according to claim 1, characterized in that: The limiting assembly includes a limiting groove 1 (9) and a limiting groove 2 (10), wherein the limiting groove 1 (9) and the limiting groove 2 (10) are located at both ends of the limiting pin (7), a spring (12) is fixedly connected in the limiting groove 1 (9), a blocking block (11) is fixedly connected to the spring (12), a main shaft (17) is rotatably connected in the limiting groove 2 (10), a clamping block (13) is fixedly connected to the main shaft (17), a torsion spring (14) is fixedly connected to the side of the clamping block (13), the other end of the torsion spring (14) is against the limiting groove 2 (10), and the blocking block (11) and the clamping block (13) are both against the positioning ruler 1 (3).

3. The ultrasonic flaw detection auxiliary device for steel plates according to claim 2, characterized in that: The top end of the limiting pin (7) close to the limiting groove (9) is in the shape of a triangular pyramid.

4. The ultrasonic flaw detection auxiliary device for steel plates according to claim 3, characterized in that: Each test block (1) is 220 mm long and 50 mm wide. The thicknesses of the five test blocks (1) are 16.4 mm, 20 mm, 24.4 mm, 29.8 mm and 36.4 mm, respectively. The depths of the V-shaped grooves (2) of the five test blocks (1) are 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm and 1.1 mm, respectively. The distance between the V-shaped grooves (2) and the edge of the test block (1) is 30 mm. The length of the V-shaped grooves (2) is 30 mm and the width is 0.5 mm. The limiting strip holes (5) are located at the short vertical beam end of the positioning ruler (3), and the clamping groove (8) is located at the long vertical beam end of the positioning ruler (3). The distances between the five limiting strip holes (5) and the clamping groove (8) are 63.3 mm, 70.5 mm, 79.3 mm, 90.1 mm and 103.3 mm, respectively.

5. A method for using an ultrasonic flaw detection auxiliary device for steel plates, characterized in that: The following steps are involved: S1. The operator first uses a CSK-IA test block to measure the ultrasonic probe multiple times. The average of these measurements is used as the actual incident point and refraction angle. The actual incident point and refraction angle are then compared with the incident point and refraction angle of the ultrasonic probe to determine the correct incident point and refraction angle. S2. After the incident point and refraction angle are verified, the operator applies coupling agent on the surface of the test block (1), adjusts the height of the positioning ruler (3) on the positioning ruler (4), and makes the height of the positioning ruler (3) the same as that of the test block (1). Then, the short crossbeam end of the positioning ruler (3) is placed against the adjacent test block (1), and the ultrasonic probe is placed in the slot to determine the detection point of the secondary reflection wave. S3. After the detection point of the secondary reflected wave is determined, remove the positioning ruler (3) and the positioning ruler (4), and the ultrasonic probe transmits ultrasonic waves in the direction of the V-groove (2), adjusting the ultrasonic incident angle according to the sound beam coverage width; S4. After the ultrasonic incident angle is determined, the ultrasonic probe transmits an ultrasonic wave, and the ultrasonic wave contacts the V-shaped groove (2) to generate a secondary reflected wave. The ultrasonic probe receives the secondary reflected wave and determines the maximum amplitude of the secondary reflected defect wave by an oscilloscope; S5. After the maximum value of the secondary reflection defect wave amplitude is determined, repeat step S2 to determine the detection point of the fourth reflection wave, then repeat step S4 to obtain the maximum value of the fourth reflection defect wave amplitude. The maximum value of the secondary reflection defect wave amplitude and the maximum value of the fourth reflection defect wave amplitude are connected to obtain the DAC curve; S6. After determining the DAC curve, the ultrasonic probe is used to detect the steel plate to be tested, and the reflected wave of the steel plate to be tested is observed through an oscilloscope. If the peak value of the reflected wave from the steel plate to be tested is higher than the DAC curve, the steel plate to be tested is unqualified; if the peak value of the reflected wave from the steel plate to be tested is lower than the DAC curve, the steel plate to be tested is qualified.

6. The method for using the ultrasonic flaw detection auxiliary device for steel plates according to claim 5, characterized in that: The steps for adjusting the ultrasonic incident angle in step S3 are: A. Emitting ultrasonic waves in the direction of the V-shaped groove (2), with the initial ultrasonic wave incident angle being 45°; B. With the probe as the center, slowly move the probe perpendicular to the acoustic beam while observing the echo amplitude on the oscilloscope. When the echo amplitude drops to half of the maximum value at the center, mark the probe's current position. The distance between the two boundaries is the acoustic beam coverage width at that location. C. Determine whether the half-diffusion angle of the ultrasonic probe (15) needs to be adjusted based on the sound beam coverage width. The calculation formula for the half-diffusion angle is: ， Where θ is the half-diffusion angle, λ is the wavelength of the ultrasonic wave in the test block, b is the short side length of the oblique probe wafer, and β is the refraction angle.

7. The method for using the ultrasonic flaw detection auxiliary device for steel plates according to claim 6, characterized in that: In step C, a method for determining whether the half-diffusion angle of the ultrasonic probe (15) needs to be adjusted is as follows: C1. First, calculate the vertical distance of the sound beam diffusion based on the half-diffusion angle of the ultrasonic probe (15). The calculation formula for the vertical distance of the sound beam diffusion is: dvertical = 4·h 厚 tanα, where d 垂 is the vertical distance of the sound beam diffusion, hthick is the thickness of the test block, and α is the half diffusion angle of the ultrasonic probe (15); C2. After determining the vertical distance of the sound beam spread, compare it with the spacing between adjacent V-grooves on the same side. If the vertical distance is less than the spacing between adjacent V-grooves on the same side, there is no need to adjust the half-divergence angle. If the vertical distance is greater than or equal to the spacing between adjacent V-grooves on the same side, the half-divergence angle needs to be adjusted.

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