Transverse wave longitudinal inclined probe coupling device

Abstract

The invention discloses a transverse wave longitudinal inclined probe coupling device, which comprises a seat body, a probe and a sound absorption part, the seat body is provided with a detection end face used for being attached to the surface of a detected object, a containing cavity and a detection opening, the containing cavity is used for being filled with a coupling agent, and the detection opening is communicated with the containing cavity and the detection end face; the probe is arranged in the containing cavity and used for emitting ultrasonic waves towards the detection opening, the emitting direction of the ultrasonic waves is inclined to the detection end face, and the probe can receive the ultrasonic waves reflected by the outside. The sound absorption part is arranged in the containing cavity and located on a reflection path of the ultrasonic waves emitted by the probe on the surface of the detected object. According to the scheme, the detection port of the seat body does not have a contact surface with the detected object, but is filled with the coupling agent, so that the condition of flaw detection distortion caused by abrasion of the contact surface is avoided; meanwhile, the sound absorption part can absorb sound waves emitted from the surface of the detected object, so that the sound waves emitted from the surface of the detected object are prevented from being reflected again in the accommodating cavity to influence defect judgment, and the flaw detection precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic flaw detection, and in particular to a shear wave longitudinal oblique probe coupling device. Background Art

[0002] Ultrasonic flaw detection is a method of using ultrasonic beams to detect defects in metal parts. The key component of ultrasonic flaw detection instruments is the phased array probe. For example, patent CN2648445Y discloses a shear wave oblique probe for ultrasonic flaw detection, which uses an acoustic matching layer set between the inclined surface of the organic glass block of the shear wave oblique probe and the piezoelectric ceramic sheet, which not only realizes the acoustic impedance transition between two propagation media with large differences in acoustic impedance, increases the energy of sound transmission, but also makes the acoustic impedance of the piezoelectric ceramic sheet and the organic glass block more matched, greatly improving the sensitivity and axial resolution of the probe.

[0003] However, the sound waves emitted by the probe in this patent are transmitted to the object to be inspected via the plexiglass block, which requires the plexiglass block to be in contact with the object to be inspected. Friction occurs when the plexiglass block moves in contact with the object to be inspected, which makes the contact surface between the plexiglass block and the object to be inspected prone to wear, resulting in an uneven contact surface, which has an adverse effect on flaw detection. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a transverse wave longitudinal oblique probe coupling device to solve the technical problem that in the prior art, the sound waves emitted by the probe are transmitted to the object to be inspected via the organic glass block, and the organic glass block needs to be in contact with the object to be inspected, which makes the contact surface between the organic glass block and the object to be inspected prone to wear, resulting in an uneven contact surface, which has an adverse effect on flaw detection.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a shear wave longitudinal oblique probe coupling device, comprising: The base body has a detection end face for being attached to the surface of the object to be detected, and is provided with a receiving cavity and a detection port, wherein the receiving cavity is used to fill the coupling agent, and the detection port communicates with the receiving cavity and the detection end face; a probe, disposed in the accommodating cavity, for emitting ultrasonic waves toward the detection port, with the emitting direction of the ultrasonic waves inclined to the detection end surface, and capable of receiving ultrasonic waves reflected from the outside; and The sound absorbing part is arranged in the accommodating cavity and is located on the reflection path of the ultrasonic wave emitted by the probe on the surface of the object to be inspected, and is used for absorbing the ultrasonic wave reflected from the surface of the object to be inspected.

[0006] In some embodiments, the sound absorbing part includes a sound absorbing plate, which is located on the reflection path of the ultrasonic wave emitted by the probe on the surface of the object to be inspected and has a sound absorbing end face facing the detection port, and the sound absorbing end face is provided with a plurality of sound absorbing serrations.

[0007] In some embodiments, the included angle of the sound absorbing sawtooth is α, satisfying 58°≤α≤62°; and / or, The sound absorbing plate is made of soft rubber.

[0008] In some embodiments, the sound absorbing plate is provided with a mounting screw hole, and the mounting screw hole and the sound absorbing serrations are located on opposite sides of the sound absorbing plate; The sound absorbing part further comprises a connecting plate and a mounting bolt. The connecting plate is connected to the seat body and is provided with a connecting hole. The mounting bolt passes through the connecting hole and is screwed into the mounting screw hole.

[0009] In some embodiments, one end of the connecting plate is connected to the inner wall of the accommodating cavity, and the other end is suspended in the accommodating cavity, wherein the connecting hole is provided at the end of the connecting plate suspended in the accommodating cavity.

[0010] In some embodiments, the shear wave longitudinal oblique probe coupling device further includes an air nozzle valve, and the air nozzle valve connects the outside with the top of the accommodating cavity.

[0011] In some embodiments, the orthographic projection of the probe on the plane where the detection port is located is a first projection area, and the orthographic projection of the end of the sound absorbing plate close to the probe on the plane where the detection port is located is a second projection area, and the second projection area falls within the first projection area.

[0012] In some embodiments, the shear wave longitudinal oblique probe coupling device further comprises a partition, which is arranged in the accommodating cavity and divides the accommodating cavity into a static coupling cavity and a dynamic coupling cavity, and has a sound-transmitting area, a static coupling agent is placed in the static coupling cavity, and the dynamic coupling cavity has an inlet and an outlet, and the inlet is used to introduce a flowing coupling agent into the dynamic coupling cavity; The detection port is connected to the detection end surface and the dynamic coupling cavity, and is located on a side of the dynamic coupling cavity away from the sound-transmitting area. The inlet and the outlet are located on two opposite sides of the detection port. The probe is located in the static coupling cavity and can emit ultrasonic waves along the layout direction of the sound-transmitting area and the detection port.

[0013] In some embodiments, the outlet is spaced apart and disposed on a side of the inlet close to the static coupling cavity.

[0014] In some embodiments, the partition is tilted from an end close to the inlet to an end close to the outlet in a direction away from the detection port.

[0015] Compared with the prior art, the transverse wave longitudinal oblique probe coupling device provided by the present invention fits the detection end face of the base body to the surface of the object to be inspected when inspecting the object to be inspected, and at the same time ensures that the sealed accommodating cavity formed by the base body and the object to be inspected is filled with a coupling agent; in this way, when the probe emits sound waves toward the detection port, the sound waves can be transmitted to the object to be inspected via the coupling agent, thereby realizing the flaw detection of the object to be inspected; since there is no contact surface between the detection port of the base body and the object to be inspected, but the coupling agent is filled, there will be no distortion of the flaw detection due to wear of the contact surface; at the same time, the sound absorbing part can absorb the sound waves emitted on the surface of the object to be inspected, thereby preventing the sound waves emitted from the surface of the object to be inspected from being reflected again in the accommodating cavity and affecting the defect judgment, thereby improving the flaw detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a shear wave longitudinal oblique probe coupling device provided by an embodiment of the present invention; Figure 2 yes Figure 1 A schematic cross-sectional view of a medium-shear wave longitudinal oblique probe coupling device; Figure 3 It is a schematic diagram of the transmission path of ultrasonic waves in the object being tested; Figure 4 yes Figure 2 Schematic diagram of the structure of the middle sound absorbing panel; Figure 5 yes Figure 2 Schematic diagram of the structure of the middle sound absorption part; Figure 6 yes Figure 4 A schematic diagram of the structure of the middle sound absorbing panel from another angle; Figure 7 yes Figure 2 A schematic cross-sectional view of the middle upper seat; Figure 8 yes Figure 2 Schematic diagram of the structure of the middle and lower seats; Fig. 9 yes Figure 7 Schematic diagram of the structure of the middle and upper seat; Fig.10 yes Figure 2 Schematic diagram of the structure of the middle partition; Fig.11 yes Figure 1 Front view of the medium shear wave longitudinal oblique probe coupling device; Fig.12 yes Fig.11 Structural diagram of the middle assembly board; Fig.13 yes Fig. 9A schematic diagram of the structure of the middle upper seat from another angle; Fig.14 yes Fig.11 Structural diagram of the middle limit plate; Fig.15 yes Fig.11 Schematic diagram of the probe structure.

[0017] Description of reference numerals: 1. seat; 1a. accommodating cavity; 1b. detection port; 1c. static coupling cavity; 1d. dynamic coupling cavity; 1e. inlet; 1d1. outlet; 1f. flow slot; 1g. water inlet channel; 1h. connecting port; 11. detection end face; 12. mounting protrusion; 12a. fastening screw hole; 13. upper seat; 13a. assembly screw hole; 13b. probe port; 131. positioning rod; 14. lower seat; 14a. positioning hole; 141. limit block; 15. assembly plate; 15a. fixing hole; 15b. limit 1. Groove; 16. Fastening screw; 17. Adjusting nut; 18. Limiting plate; 18a. Avoidance; 19. Assembly bolt; 2. Probe; 21. Detection head; 22. Probe seat; 23. Baffle; 3. Sound absorption part; 31. Sound absorption plate; 31a. Mounting screw hole; 32. Sound absorption serration; 33. Connecting plate; 33a. Connecting hole; 4. Air nozzle valve; 5. Partition; 51. Sound-transmitting area; 52. Mounting plate; 52a. Matching hole; 53. Sound-transmitting membrane; 54. Fixing bolt; 6. Flow stabilizing block; 7. Object to be inspected. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem in the prior art that the sound waves emitted by the probe are transmitted to the object to be inspected via the organic glass block, the organic glass block needs to be in contact with the object to be inspected, which makes the contact surface between the organic glass block and the object to be inspected prone to wear, resulting in an uneven contact surface and an adverse effect on flaw detection, the present invention provides a transverse wave longitudinal oblique probe coupling device, which will not cause flaw detection distortion due to contact surface wear, and the sound absorbing part can absorb the sound waves emitted on the surface of the object to be inspected, so as to avoid the sound waves emitted from the surface of the object to be inspected from being reflected again in the accommodating cavity to affect the defect judgment, thereby improving the flaw detection accuracy.

[0020] See also Figure 1 and Figure 2 , Figure 1 and Figure 2It is a structural schematic diagram of a shear wave longitudinal oblique probe coupling device in an embodiment of the present invention, wherein the shear wave longitudinal oblique probe coupling device comprises a base 1, a probe 2 and a sound absorbing portion 3; the base 1 has a detection end face 11 for being attached to the surface of the object to be inspected 7, and is provided with a receiving cavity 1a and a detection port 1b, the receiving cavity 1a is used to fill a coupling agent, and the detection port 1b connects the receiving cavity 1a and the detection end face 11; the probe 2 is arranged in the receiving cavity 1a, and is used to emit ultrasonic waves toward the detection port 1b, and its ultrasonic wave emission direction is inclined to the detection end face 11, and can receive ultrasonic waves reflected from the outside; the sound absorbing portion 3 is arranged in the receiving cavity 1a, and is located on the reflection path of the ultrasonic wave emitted by the probe 2 on the surface of the object to be inspected 7, and is used to absorb the ultrasonic wave reflected from the surface of the object to be inspected 7.

[0021] When the transverse wave longitudinal oblique probe coupling device provided by the present invention detects flaws on the object 7, the detection end face 11 of the base 1 is attached to the surface of the object 7, and at the same time, it is ensured that the sealed accommodating chamber 1a formed by the base 1 and the object 7 is filled with a coupling agent; in this way, when the probe 2 emits sound waves toward the detection port 1b, the sound waves can be transmitted to the object 7 through the coupling agent, thereby realizing the flaw detection of the object 7; since there is no contact surface between the detection port 1b of the base 1 and the object 7, but the coupling agent is filled, there will be no distortion of the flaw detection due to wear of the contact surface; at the same time, the sound absorbing part 3 can absorb the sound waves emitted on the surface of the object 7, so as to avoid the sound waves emitted from the surface of the object 7 being reflected again in the accommodating chamber 1a and affecting the defect judgment, thereby improving the flaw detection accuracy.

[0022] It should be noted that, taking the steel plate with a maximum thickness of 80 mm for the object 7 to be tested, and using the probe 2 at an incident angle of 19° in the coupling agent, that is, the angle between the ultrasonic wave emitted by the probe 2 and the normal line of the detection end surface 11 is 19°. The ultrasonic wave is converted into a 45° shear wave in the object 7 for detection. The limit value of the primary sound path in the object 7 is 113 mm, and the limit value of the secondary sound path is 226 mm. Please refer to Figure 3 The sound absorbing probe structure needs to satisfy L1+L2>L1+T1+T2, so that if there is a reflected signal at the end of L2, it will appear behind the reflected signal of T2; in this way, a time difference is reserved for T1 and T2 for defect assessment, ensuring that there are no other signals before the reflected signal of T2, effectively avoiding the superposition of the reflected signal of L2 on the reflected signals of T1 and T2. In this solution, the sound absorbing part 3 is set on the emission path of the sound wave on the surface of the inspected object 7, so that the reflected wave on the surface of the inspected object 7 cannot return to the probe 2 along the original sound path, thereby ensuring the detection accuracy.

[0023] In one embodiment, see Figure 4 The sound absorbing part 3 includes a sound absorbing plate 31, which is located on the reflection path of the ultrasonic wave emitted by the probe 2 on the surface of the object 7, and has a sound absorbing end face facing the detection port 1b, and the sound absorbing end face is provided with a plurality of sound absorbing serrations 32.

[0024] In this embodiment, when the sound waves reflected from the surface of the object under test 7 are transmitted to the sound absorbing end surface of the sound absorbing plate 31, they will propagate and collide with each other between the sound absorbing serrations 32, extend the propagation path, and finally attenuate and cannot return to the probe 2, thereby achieving effective sound absorption, simple structure and low cost.

[0025] In one embodiment, the included angle of the sound absorbing teeth 32 is α, which satisfies 58°≤α≤62°; and the material of the sound absorbing plate 31 is soft rubber.

[0026] In this embodiment, the angle of each sound absorbing sawtooth 32 is set to between 58° and 62° to improve the attenuation capability of the sound absorbing sawtooth 32 to sound waves. Specifically, in this solution, the angle of the sound absorbing sawtooth 32 is set to 60°. In addition, the entire sound absorbing plate 31 is made of soft rubber material to further improve the absorption capability of sound waves.

[0027] In one embodiment, see Figure 5 and Figure 6 The sound absorbing plate 31 is provided with a mounting screw hole 31a, and the mounting screw hole 31a and the sound absorbing serrations 32 are located on opposite sides of the sound absorbing plate 31; the sound absorbing part 3 also includes a connecting plate 33 and a mounting bolt, the connecting plate 33 is connected to the base body 1, and is provided with a connecting hole 33a, the mounting bolt is passed through the connecting hole 33a, and is screwed into the mounting screw hole 31a.

[0028] In this embodiment, the sound absorbing plate 31 is detachably mounted on the connecting plate 33 by means of the mounting bolts, the connecting holes 33a and the mounting screw holes 31a, so that the sound absorbing plate 31 can be regularly removed from the connecting plate 33 for cleaning, thereby ensuring that the sound absorbing plate 31 has good sound absorbing ability. At the same time, it is also convenient for operators to replace the sound absorbing plate 31 when it is damaged.

[0029] In one embodiment, one end of the connecting plate 33 is connected to the inner wall of the accommodating cavity 1a, and the other end is suspended in the accommodating cavity 1a, wherein the connecting hole 33a is provided at the end of the connecting plate 33 suspended in the accommodating cavity 1a.

[0030] In this embodiment, one end of the connecting plate 33 is fixed to the inner wall of the accommodating cavity 1a, and the other end is suspended in the accommodating cavity 1a, that is, the sound absorbing plate 31 is suspended in the accommodating cavity 1a. In this way, when the sound wave falls on the sound absorbing plate 31, the sound absorbing plate 31 is driven to vibrate to a certain extent, so as to drive the bubbles between the sound absorbing teeth 32 of the sound absorbing plate 31 to float up, so as to avoid the bubbles between the sound absorbing teeth 32 and reduce the sound absorption effect of the sound absorbing plate 31.

[0031] In one of the embodiments, the shear wave longitudinal oblique probe coupling device further includes an air nozzle valve 4, which communicates with the outside and the top of the accommodating chamber 1a.

[0032] In this embodiment, a gas nozzle valve 4 is further provided to connect the top of the accommodating chamber 1a with the outside world, so as to regularly discharge the gas in the top of the accommodating chamber 1a and reduce the probability of the coupling agent entraining the gas. Specifically, in this solution, two gas nozzle valves 4 are provided on the top of the seat body 1, and the two gas nozzle valves 4 are spaced apart at both ends of the extending direction of the accommodating chamber 1a.

[0033] In one embodiment, the orthographic projection of the probe 2 on the plane where the detection port 1b is located is the first projection area, and the orthographic projection of the end of the sound absorbing plate 31 close to the probe 2 on the plane where the detection port 1b is located is the second projection area, and the second projection area falls within the first projection area.

[0034] In this embodiment, the projections of the probe 2 and the sound absorbing plate 31 on the horizontal plane are arranged to partially overlap, so as to ensure that the reflected waves of the ultrasonic wave on the surface of the object 7 can all fall on the sound absorbing plate 31, thereby effectively avoiding the influence of the reflected waves on the surface of the object 7.

[0035] In one embodiment, see Figure 2 and Figure 7 The shear wave longitudinal oblique probe coupling device also includes a partition 5, which is arranged in the accommodating chamber 1a, and divides the accommodating chamber 1a into a static coupling chamber 1c and a dynamic coupling chamber 1d, and has a sound-transmitting area 51. The static coupling chamber 1c contains a static coupling agent, and the dynamic coupling chamber 1d has an inlet 1e and an outlet 1d1. The inlet 1e is used to introduce a flowing coupling agent into the dynamic coupling chamber 1d; the detection port 1b connects the detection end face 11 and the dynamic coupling chamber 1d, and is located on a side of the dynamic coupling chamber 1d away from the sound-transmitting area 51. The inlet 1e and the outlet 1d1 are located on two opposite sides of the detection port 1b. The probe 2 is located in the static coupling chamber 1c, and can emit ultrasonic waves along the layout direction of the sound-transmitting area 51 and the detection port 1b.

[0036] In this embodiment, the detection end face 11 provided with the detection port 1b is attached to the surface of the object to be inspected 7 to form a closed space between the dynamic coupling cavity 1d and the surface of the object to be inspected 7, and then the flowing coupling agent is continuously injected into the dynamic coupling cavity 1d through the water pipe via the inlet 1e, so that the dynamic coupling cavity 1d is continuously filled with the dynamic coupling agent, and the position of the object to be inspected 7 corresponding to the detection port 1b is ensured to have the coupling agent infiltration effect. Then, the ultrasonic wave is emitted through the probe 2, and the ultrasonic wave reaches the object to be inspected 7 after passing through the static coupling cavity 1c, the sound-transmitting area 51, the dynamic coupling cavity 1d and the detection port 1b, and then returns to the probe 2 along the original route to realize the flaw detection of the object. In this way, there is no need to set up a separate water tank, nor is there any need to place the probe 2 frame or pipe fittings in the water of the water tank, and the operation is relatively convenient.

[0037] It should be noted that in this solution, water is used as a coupling agent to keep the probe 2 away from the object 7 to avoid direct contact between the probe 2 and the object 7 and wear, and to ensure that the near field of the probe 2 is in the water, which is conducive to ultrasonic detection and has good practicality. It should be noted that the use of a dynamic water flow setting can also quickly remove dirt on the surface of the object 7 to improve detection accuracy.

[0038] In one embodiment, the outlet 1d1 is spaced apart from the inlet 1e on a side close to the static coupling cavity 1c.

[0039] In this embodiment, the outlet 1d1 is spaced apart from the inlet 1e, specifically, the outlet 1d1 is spaced apart above the inlet 1e. In this way, after water is supplied, the water will overflow from the low place to the high place, and the air will also be compressed from the low place to the high place, and then discharged from the outlet 1d1, so that the dynamic coupling cavity 1d can achieve second stability. At the same time, the bubbles entrained by the dynamic coupling water in the dynamic coupling cavity 1d can float to the outlet 1d1 and be discharged through the outlet 1d1, so as to avoid the accumulation of bubbles in the dynamic coupling cavity 1d and affect the flaw detection accuracy.

[0040] In one embodiment, the partition plate 5 is tilted from an end close to the inlet 1e to an end close to the outlet 1d1 in a direction away from the detection port 1b.

[0041] In this embodiment, the partition 5 is also tilted upward in the direction close to the outlet 1d1, so that it is further convenient for the bubbles entrained in the dynamic coupling water to be discharged from the outlet 1d1 along the tilt direction of the partition 5, so that the bubbles in the dynamic coupling water can be discharged quickly.

[0042] In one embodiment, see Figure 2 and Figure 8 The dynamic coupling cavity 1d is open on one side in the horizontal direction to form an inlet 1e; the seat body 1 also has a flow groove 1f and a water inlet channel 1g. The flow groove 1f is located on the side of the inlet 1e away from the outlet 1d1, and its side wall close to the inlet 1e is open to connect to the inlet 1e. The water inlet channel 1g is connected to the flow groove 1f and the water pipe.

[0043] In this embodiment, the side of the flow groove 1f close to the dynamic coupling cavity 1d is open to communicate with the dynamic coupling cavity 1d. Specifically, the dynamic coupling cavity 1d is connected with the flow groove 1f at various locations along the length direction of the pipe. In this way, water can be injected into the flow groove 1f through the water inlet channel 1g, and the flow groove 1f then quickly fills the dynamic coupling cavity 1d at various locations on the axis of the pipe with the flowing water, thereby ensuring that the water flow direction of the dynamic coupling cavity 1d at various locations on the axial direction of the pipe is relatively stable and consistent, thereby improving the detection accuracy.

[0044] In one of the embodiments, the shear wave longitudinal oblique probe coupling device also includes a flow stabilizer block 6, which is arranged in the inlet 1e and is spaced apart from the inner wall of the inlet 1e close to the partition 5. The flow groove 1f is provided with a connecting port 1h connected to the water inlet channel 1g, and the connecting port 1h is located on the side of the inlet 1e away from the flow stabilizer block 6.

[0045] In this embodiment, a flow stabilizing block 6 is further provided at the inlet 1e to prevent the flowing water from directly being ejected into the dynamic coupling cavity 1d after entering the flow groove 1f from the water inlet channel 1g. Specifically, after the flowing water enters the flow groove 1f, it is stopped on the flow stabilizing block 6, which slows down the flow velocity of the flowing water to a certain extent and improves the stability of the dynamically coupled water.

[0046] In one of the embodiments, the connecting port 1h is located in the middle of the flow groove 1f, and the flow stabilizing block 6 is arranged in a wave shape near the side wall of the flow groove 1f, and is provided with a main wave crest and multiple sub-wave crests. The main wave crest is opposite to the connecting port 1h, and the multiple sub-wave crests are symmetrically arranged on both sides of the main wave crest, and their peak values ​​gradually decrease in the direction away from the main wave crest and are smaller than the peak value of the main wave crest.

[0047] In this embodiment, the main wave peak corresponds to the part where the flow slot 1f connects to the water inlet channel 1g, and the peak value of the main wave peak is set to be greater than the peak value of the secondary wave peak. In this way, the flow velocity at the part of the flow slot 1f corresponding to the water inlet channel 1g can be relatively greatly slowed down, so that the flow velocity at various places entering the dynamic coupling cavity 1d from the flow slot 1f is relatively consistent and stable, effectively improving the waveform stability.

[0048] In one embodiment, see Fig. 9 and Fig.10 The inner wall of the accommodating cavity 1a is provided with a mounting protrusion 12, and the mounting protrusion 12 is provided with a fastening screw hole 12a; the partition 5 includes a mounting plate 52, a sound-transmitting membrane 53 and a fixing bolt 54. A mounting opening is provided in the middle of the mounting plate 52, and a matching hole 52a is provided corresponding to the fastening screw hole 12a. The main part of the sound-transmitting membrane 53 is located at the mounting opening to form a sound-transmitting area 51, and its edge is pressed against the mounting protrusion 12 by the mounting plate 52. The fixing bolt 54 is passed through the matching hole 52a and is screwed into the fastening screw hole 12a.

[0049] In this embodiment, the sound-transmitting membrane 53 is pressed against the mounting protrusion 12 through the mounting plate 52, and the mounting plate 52 is screwed to the mounting protrusion 12 through the fixing bolts 54. In this way, the sound-transmitting membrane 53 can be replaced in time when it is damaged, and the operation is simple and convenient, and the cost is low. It should be noted that in this solution, the acoustic impedance of the sound-transmitting membrane 53 is similar to that of water, which reduces the loss of ultrasonic energy.

[0050] In one embodiment, see Figures 11 to 13The seat body 1 includes an upper seat 13, a lower seat 14, an assembly plate 15 and an assembly bolt 19. The upper seat 13 and the lower seat 14 are jointly surrounded by an accommodating cavity 1a. A positioning rod 131 is provided on one side of the upper seat 13, and an assembly screw hole 13a is provided on the other side. A positioning hole 14a is provided on the inner side of the lower seat 14 corresponding to the positioning rod 131, and a limiting block 141 is provided on the side close to the assembly screw hole 13a. The assembly plate 15 is provided with a fixing hole 15a corresponding to the assembly screw hole 13a, and a limiting groove 15b is provided corresponding to the limiting block 141; wherein, the positioning rod 131 is inserted into the positioning hole 14a, the limiting block 141 is inserted into the limiting groove 15b, and the assembly bolt 19 is passed through the fixing hole 15a and screwed in the assembly screw hole 13a.

[0051] In this embodiment, the seat body 1 is configured as an upper seat 13, a lower seat 14, an assembly plate 15 and assembly bolts 19 according to the above requirements, so that the seat body 1 can be disassembled and assembled, and the inner wall of the static coupling cavity 1c and the dynamic coupling cavity 1d can be cleaned regularly to avoid dirt accumulation in the cavity and affect the accuracy of flaw detection, and the assembly operation is relatively convenient. It should be noted that in this solution, the detection port 1b is arranged on the lower seat 14, and the lower seat 14 is made of wear-resistant material. Specifically, a white steel alloy rod is organically combined with ABS plastic, which is wear-resistant, controls noise, and does not cause damage to the pipe. It should be noted that the probe structure in the example of the attached figure is used for flaw detection of pipes, and the detection end face 11 of the lower seat 14 is set to an arc corresponding to the surface of the pipe.

[0052] In one embodiment, see Figures 13 to 15 The upper seat 13 is provided with a probe port connected to the static coupling cavity 1c. The probe 2 includes a connected detection head 21 and a probe seat 22. The detection head 21 extends into the static coupling cavity 1c from the probe port. A baffle 23 is provided at one end of the probe seat 22 away from the detection head 21. The baffle 23 is stopped at the end edge of the probe port. The seat body 1 also includes multiple groups of fastening screws 16 and multiple groups of limiting plates 18. The fastening screws 16 and the probe port are located on the same side of the upper seat 13. Each group of fastening screws 16 is provided with two. The fastening screws 16 of the same group are located on both sides of the probe port, and each fastening screw 16 is provided with two adjusting nuts 17. The multiple groups of limiting plates 18 correspond to the multiple groups of fastening screws 16. The two ends of each limiting plate 18 are respectively provided with avoidance openings 18a. The avoidance openings 18a are provided for the fastening screws 16 to pass through and are pressed between the two adjusting nuts 17. The limiting plates 18 are pressed against the probe seat 22.

[0053] In this embodiment, the probe 2 is pressed against the probe port edge of the upper seat 13 by the limit plate 18, which is simple and convenient to operate. The position of the limit plate 18 can be moved by loosening and tightening the adjustment nut 17, and the length of the probe 2 extending into the static coupling cavity 1c can be adjusted by adding or removing gaskets under the baffle 23. That is, the distance between the probe 2 and the sound-transmitting plate can be flexibly adjusted, which has good practicality.

[0054] In order to better understand the present invention, the following Figures 1 to 15 The technical solution of the present invention is described in detail: The probe 2 emits sound waves at an angle toward the detection end face 11. A part of the emitted sound waves is reflected on the surface of the object to be inspected 7. The sound waves reflected from the surface of the object to be inspected 7 propagate to the sound-absorbing serrations 32 of the sound-absorbing plate 31, and propagate and collide with each other between the sound-absorbing serrations 32, extending the propagation path, and finally attenuate and cannot return to the probe 2; the other part of the sound waves enters the interior of the object to be inspected 7 to perform flaw detection. At the same time, since there is no contact surface between the detection port 1b of the base 1 and the object to be inspected 7, the sound waves emitted by the probe 2 are transmitted through the coupling agent and directly fall on the object to be inspected 7 after passing through the detection port 1b, that is, there will be no distortion of flaw detection due to wear of the contact surface, thereby improving the flaw detection accuracy.

[0055] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A shear wave longitudinal oblique probe coupling device, characterized in that: include: The base body has a detection end face for being attached to the surface of the object to be detected, and is provided with a receiving cavity and a detection port, wherein the receiving cavity is used to fill the coupling agent, and the detection port communicates with the receiving cavity and the detection end face; a probe, disposed in the accommodating cavity, for emitting ultrasonic waves toward the detection port, with the emitting direction of the ultrasonic waves inclined to the detection end surface, and capable of receiving ultrasonic waves reflected from the outside; and The sound absorbing part is arranged in the accommodating cavity and is located on the reflection path of the ultrasonic wave emitted by the probe on the surface of the object to be inspected, and is used for absorbing the ultrasonic wave reflected from the surface of the object to be inspected.

2. The shear wave longitudinal oblique probe coupling device according to claim 1, characterized in that: The sound absorbing part comprises a sound absorbing plate, which is located on the reflection path of the ultrasonic wave emitted by the probe on the surface of the object to be inspected and has a sound absorbing end face facing the detection port, and the sound absorbing end face is provided with a plurality of sound absorbing serrations.

3. The shear wave longitudinal oblique probe coupling device according to claim 2, characterized in that: The included angle of the sound absorbing sawtooth is α, which satisfies 58°≤α≤62°; and / or, The sound absorbing plate is made of soft rubber.

4. The shear wave longitudinal oblique probe coupling device according to claim 2, characterized in that: The sound absorbing plate is provided with a mounting screw hole, and the mounting screw hole and the sound absorbing serrations are located on opposite sides of the sound absorbing plate; The sound absorbing part further comprises a connecting plate and a mounting bolt. The connecting plate is connected to the seat body and is provided with a connecting hole. The mounting bolt passes through the connecting hole and is screwed into the mounting screw hole.

5. The shear wave longitudinal oblique probe coupling device according to claim 4, characterized in that: One end of the connecting plate is connected to the inner wall of the accommodating cavity, and the other end is suspended in the accommodating cavity, wherein the connecting hole is provided at the end of the connecting plate suspended in the accommodating cavity.

6. The shear wave longitudinal oblique probe coupling device according to claim 5, characterized in that: The shear wave longitudinal oblique probe coupling device also includes an air nozzle valve, which communicates with the outside and the top of the accommodating cavity.

7. The shear wave longitudinal oblique probe coupling device according to claim 2, characterized in that: The orthographic projection of the probe on the plane where the detection port is located is a first projection area, and the orthographic projection of the end of the sound absorbing plate close to the probe on the plane where the detection port is located is a second projection area, and the second projection area falls within the first projection area.

8. The shear wave longitudinal oblique probe coupling device according to claim 1, characterized in that: The shear wave longitudinal oblique probe coupling device also includes a partition, which is arranged in the accommodating cavity and divides the accommodating cavity into a static coupling cavity and a dynamic coupling cavity, and has a sound-transmitting area, a static coupling agent is placed in the static coupling cavity, and the dynamic coupling cavity has an inlet and an outlet, and the inlet is used to introduce a flowing coupling agent into the dynamic coupling cavity; The detection port is connected to the detection end surface and the dynamic coupling cavity, and is located on a side of the dynamic coupling cavity away from the sound-transmitting area. The inlet and the outlet are located on two opposite sides of the detection port. The probe is located in the static coupling cavity and can emit ultrasonic waves along the layout direction of the sound-transmitting area and the detection port.

9. The shear wave longitudinal oblique probe coupling device according to claim 8, characterized in that: The outlet is spaced apart and arranged at a side of the inlet close to the static coupling cavity.

10. The shear wave longitudinal oblique probe coupling device according to claim 9, characterized in that: The partition is inclined from one end close to the inlet to one end close to the outlet in a direction away from the detection port.

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