LCR wave sensor assembly for curved surface stress measurement

Abstract

The invention discloses an LCR wave sensor assembly for curved surface stress measurement, and belongs to the technical field of ultrasonic stress measurement. The problems that an existing LCR wave sensor assembly cannot be suitable for a curved surface measured piece, the distance between a transmitting end ultrasonic transducer and a receiving end ultrasonic transducer is difficult to regulate and control, the existing LCR wave sensor assembly cannot be suitable for measured pieces made of different materials, and accurate coupling layer thickness control is difficult to achieve are solved. Comprising a main shell, a transmitting end assembly, a receiving end assembly and a distance adjusting assembly, the transmitting end assembly, the receiving end assembly and the distance adjusting assembly are arranged in the main shell, and pressing force between the transmitting end assembly and a tested piece and pressing force between the receiving end assembly and the tested piece are correspondingly adjusted through the two pressure adjusting assemblies. The distance between the transmitting end assembly and the receiving end assembly is adjusted through the distance adjusting assembly. The device and the method are suitable for curved surface stress measurement of measured pieces with different diameters and materials.

Description

Technical Field

[0001] This invention relates to an LCR wave sensor assembly for measuring surface stress, belonging to the field of ultrasonic stress measurement technology. Background Technology

[0002] For curved structures such as ducts, stress testing is necessary during assembly to ensure stable operation. Taking aero-engines as an example, the internal air ducts operate in harsh environments. The working conditions vary significantly between different parts of the duct. Assembly stress is one of the main factors affecting the operational status of aero-engine ducts. To improve the reliability and stability of aero-engines, ensure the safe and stable operation of the overall aero-engine piping system, and prevent failure of aero-engine piping under extremely harsh conditions, it is necessary to measure the assembly stress of the ducts during the assembly process.

[0003] Currently, there are three main methods for stress measurement: non-destructive (NDT), micro-destructive (MDD), and destructive (DSD). DSD and MSD methods include drilling and deep-hole methods, respectively. NDT methods include X-ray diffraction, neutron diffraction, strain gauge methods, electromagnetic methods, eddy current testing, and ultrasonic methods. Among NDT methods, ultrasonic methods have advantages such as high spatial resolution and a large measurement range. The critical refraction longitudinal wave (LCR) method, compared with other ultrasonic stress measurement methods, has significant advantages in residual stress measurement due to its sensitivity to stress fields and minimal influence from material structure. Furthermore, LCR waves can propagate parallel to the surface of the measured component, making LCR wave measurement a highly promising method for measuring assembly stress in curved structures such as pipes.

[0004] Currently, the following important problems still exist in the LCR wave stress measurement method: 1. The LCR wave stress measurement method is often used to measure planar test pieces. In the stress measurement process of curved structures, the sensor group is difficult to adapt to the curved test piece due to its rigid wedge. Therefore, the coupling effect between the sensor or wedge and the test piece is poor when performing stress measurement, resulting in low stress measurement accuracy.

[0005] 2. The fixed wedge angle of traditional sensor sets means that they can only measure test pieces made of fixed materials, which limits their application range.

[0006] 3. In stress measurement, the coupling layer is used to transmit ultrasonic waves between the transducer and the test piece. Because stress needs to be measured at different locations, the position of the ultrasonic transducer needs to be changed multiple times, making it difficult to maintain a constant coupling layer thickness. Even changes in coupling layer thickness on the order of micrometers can cause nanosecond-level propagation time differences in ultrasonic waves. However, stress-induced changes in ultrasonic wave propagation speed have a weaker impact, resulting in propagation time differences on the order of nanoseconds. Therefore, inconsistent coupling layer thickness introduces additional acoustic time differences, thereby reducing the accuracy of stress measurement. Furthermore, some liquid coupling agents can remain on the surface of the test piece after measurement, causing rust and corrosion.

[0007] 4. The distance between the transmitting and receiving ultrasonic transducers is crucial for the accuracy of stress measurement. As the propagation distance of LCR waves increases, the cumulative effect of residual stress within the material on its acoustoelastic action becomes more pronounced. Therefore, a longer propagation distance allows for a more thorough interaction between the sound wave and the internal stress of the material, thereby improving the sensitivity and accuracy of the measurement. However, due to signal attenuation, an increased transmission distance leads to lower signal strength and susceptibility to interference signals. Therefore, the optimal distance between transducers varies depending on the experimental conditions and the device under test. However, the fixed spacing between transducers in traditional sensor arrays limits the measurement conditions.

[0008] Therefore, there is an urgent need for an LCR wave sensor assembly that can be applied to stress measurement of curved surfaces of different diameters to solve the aforementioned technical problems in the prior art. Summary of the Invention

[0009] The present invention addresses the problems of existing LCR wave sensor assemblies, such as their inability to be applied to curved test surfaces, difficulty in adjusting the distance between the transmitting and receiving ultrasonic transducers, inability to be applied to test surfaces made of different materials, and difficulty in achieving precise control of the coupling layer thickness. Therefore, the present invention provides an LCR wave sensor assembly for measuring curved surface stress.

[0010] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: An LCR wave sensor assembly for measuring surface stress includes a main housing and a transmitter assembly, a receiver assembly, and a distance adjustment assembly disposed inside the main housing. Two sets of pressure regulating components are installed on the upper part of the main housing. These two sets of pressure regulating components are used to adjust the clamping force between the transmitting end component and the test object, as well as between the receiving end component and the test object. The transmitter and receiver components have the same structure and are arranged symmetrically about the distance adjustment component. The transmitting end assembly includes a rubber wedge, an ultrasonic transducer, a housing, a first clamping bolt, a movable plate, and an angle adjustment assembly. The bottom of the rubber wedge has an arc-shaped structure and contacts the surface of the test piece. The housing covers the rubber wedge and is fixedly connected to it. The pressure adjustment assembly is correspondingly arranged above the housing. The inclined surfaces of the transmitting end rubber wedge and the receiving end rubber wedge are arranged in a V-shape. The ultrasonic transducer is correspondingly embedded in the inclined surface of the rubber wedge. The angle adjustment assembly is mounted on the main housing. One end of the movable plate is hinged to the housing, and the other end overlaps above the movable end of the angle adjustment assembly. The first clamping bolt is threaded onto the movable plate and abuts against the surface of the ultrasonic transducer. The distance between the transmitting and receiving components is adjusted using a distance adjustment component. The main housing and the test piece are bound together by a strip.

[0011] Furthermore, the distance adjustment assembly includes an adjusting rod, a worm gear, and a worm, wherein the two ends of the worm are respectively threaded to two housings and the external threads at the two ends of the worm have opposite directions of rotation. One end of the adjusting rod is mounted on the upper part of the main housing and a handle is fixedly mounted on one end of the adjusting rod. The worm gear is coaxially fixedly mounted on the other end of the adjusting rod and meshes with the worm.

[0012] Furthermore, a compression spring is provided between the other end of the adjusting rod and the upper part of the main housing.

[0013] Furthermore, the pressure regulating assembly includes a second clamping bolt, a clamping nut, and a pressure sensor. The top of the main housing has two first limiting elongated holes, which are stepped holes. The two clamping nuts are correspondingly arranged in the large diameter sections of the two first limiting elongated holes, and the clamping nuts are circumferentially limited by the inner wall of the large diameter section of the first limiting elongated holes. The second clamping bolt is threaded into the clamping nut, and the two second clamping bolts are correspondingly arranged in the small diameter sections of the two first limiting elongated holes. The pressure sensor is installed between the second clamping bolt and the top of the housing.

[0014] Furthermore, the length of the first limiting elongated hole is equal to the maximum distance that the ultrasonic transducer can move.

[0015] Furthermore, the angle adjustment assembly includes a mounting base, a knob, and a slider. The mounting base is fixedly installed in the lower part of the housing. The upper part of the mounting base has an upward-facing groove. The knob is inserted into the upper part of the mounting base, with one end of the knob located in the groove. A gear is installed at one end of the knob. The slider is vertically slidably inserted into the groove, and a rack that meshes with the gear is vertically installed on the slider. The other end of the movable plate overlaps the top of the slider.

[0016] Furthermore, the two angle adjustment components are installed at opposite ends of the two housings.

[0017] Furthermore, both the main shell and the outer shell are inverted U-shaped structures.

[0018] Furthermore, the lower two sides of the rubber wedge are machined with stepped surfaces, the bottom end of the outer shell overlaps on the stepped surfaces, the upper part of the rubber wedge is machined with a first limiting through hole, the upper part of the outer shell is machined with a second limiting through hole, and the first limiting through hole and the second limiting through hole are arranged coaxially.

[0019] Furthermore, second limiting elongated holes are machined laterally on both sides of the main housing of the transmitter assembly and both sides of the main housing of the receiver assembly. The first limiting through hole, the second limiting through hole and the second limiting elongated hole are arranged coaxially. The connection between the transmitter assembly and the main housing and the receiver assembly and the main housing is achieved by inserting fixing bolts into the second limiting elongated hole, the second limiting through hole and the first limiting through hole.

[0020] Compared with the prior art, the present invention has the following advantages: The ultrasonic transducer at the transmitting end and the ultrasonic transducer at the receiving end are used to excite and receive ultrasonic waves, respectively. The main housing is bound to the test piece via the strip, preventing the LCR wave sensor assembly from detaching from the test piece. The length of the strip is adjustable, allowing the LCR wave sensor assembly to be fixed to test pieces of different diameters by adjusting the strip length.

[0021] The tilt angle of the movable plate is adjusted by adjusting the angle adjustment component. The flexibility of the rubber wedge is used to adjust the tilt angle of the ultrasonic transducer, thereby adjusting the incident angle of the sensor component. This is very important for the generation of LCR waves because the first critical refraction angle is closely related to the sound velocity of the material being measured. This angle is different when measuring different materials.

[0022] Rubber wedges are used to ensure tight contact with the workpiece under test. Utilizing flexible rubber with a machined arc-shaped structure as a wedge, and applying a certain clamping force through a pressure regulating component, tight contact with workpieces of different diameters can be achieved. Simultaneously, the rubber wedge serves as a coupling layer between the ultrasonic wave and the workpiece. Its coupling characteristics can be precisely adjusted and controlled through pressure regulating components at both the transmitter and receiver ends, making it easier to control and maintain consistent coupling characteristics compared to traditional coupling layers. This not only ensures stable ultrasonic wave transmission but also overcomes the drawbacks of separate coupling layers or liquid coupling, thereby improving stress measurement accuracy.

[0023] The pressure regulating component can accurately display and adjust the clamping force applied to the housing.

[0024] The distance adjustment component allows for adjustment of the distance between the ultrasonic transducers at both ends of the transmitter and receiver, further adapting to test objects of different materials and experimental conditions.

[0025] In summary, the LCR wave sensor assembly for measuring curved surface stress of the present invention is applicable to test pieces of different diameters and materials, expanding its applicability compared to existing technologies. At the same time, by employing rubber wedges, angle adjustment components, and distance adjustment components, the stress measurement accuracy is greatly improved. Attached Figure Description

[0026] Figure 1 This is a first three-dimensional structural schematic diagram of the LCR wave sensor assembly for measuring curved surface stress according to the present invention. Figure 2 This is a second three-dimensional structural schematic diagram of the LCR wave sensor assembly for measuring curved surface stress according to the present invention. Figure 3 This is a perspective view of the LCR wave sensor assembly for measuring surface stress according to the present invention. Figure 4 This is a three-dimensional half-sectional view of the LCR wave sensor assembly for measuring curved surface stress according to the present invention. Figure 5 This is a three-dimensional structural schematic diagram of the LCR wave sensor assembly for measuring curved surface stress according to the present invention (main housing not shown). Figure 6 A schematic diagram of the main shell and strip structure; Figure 7 This is a first structural schematic diagram of the housing and mounting base; Figure 8 This is a second structural schematic diagram of the housing and mounting base; Figure 9 This is a schematic diagram of the three-dimensional structure of the movable board; Figure 10 This is a perspective view of the rubber wedge.

[0027] In the picture: 1. Main housing; 11. First limiting elongated hole; 12. Second limiting elongated hole; 2. Transmitter assembly; 21. Rubber wedge; 211. Arc-shaped through groove; 212. Stepped surface; 213. First limiting through hole; 22. Ultrasonic transducer; 23. Outer shell; 231. Second limiting through hole; 232. Boss; 24. First clamping bolt; 25. Movable plate; 26. Angle adjustment assembly; 261. Mounting base; 262. Knob; 263. Slider; 264. Groove; 3. Receiver assembly; 4. Distance adjustment assembly; 41. Adjusting rod; 42. Worm gear; 43. Worm; 44. Handle; 45. Compression spring; 5. Pressure adjustment assembly; 51. Second clamping bolt; 52. Compression nut; 53. Pressure sensor; 6. Roller strip; 7. Fixing bolt; 100. Test piece. Detailed Implementation

[0028] Specific implementation method one: Combining Figures 1-10This description of embodiments provides a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the descriptions of "front," "rear," "left," "right," "inner," "outer," "left side," "right side," "upper part," "lower part," "top," and "bottom" in this invention are defined based on the orientation or positional relationships shown in the accompanying drawings. They are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the described structure must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] An LCR wave sensor assembly for measuring surface stress includes a main housing 1 and a transmitter assembly 2, a receiver assembly 3, and a distance adjustment assembly 4 disposed inside the main housing 1. Two sets of pressure regulating components 5 are installed on the upper part of the main housing 1. The two sets of pressure regulating components 5 are used to adjust the clamping force between the transmitting end component 2 and the test object 100, and between the receiving end component 3 and the test object 100. Transmitter component 2 and receiver component 3 have the same structure and are arranged symmetrically about distance adjustment component 4. The transmitting end assembly 2 includes a rubber wedge 21, an ultrasonic transducer 22, a housing 23, a first clamping bolt 24, a movable plate 25, and an angle adjustment assembly 26. The bottom of the rubber wedge 21 has an arc-shaped structure and contacts the surface of the test piece 100. The housing 23 covers the rubber wedge 21 and is fixedly connected to it. The pressure adjustment assembly 5 is correspondingly arranged above the housing 23. The inclined surfaces of the transmitting end rubber wedge 21 and the receiving end rubber wedge 21 are distributed in a V-shape. The ultrasonic transducer 22 is correspondingly embedded in the inclined surface of the rubber wedge 21. The angle adjustment assembly 26 is mounted on the main housing 1. One end of the movable plate 25 is hinged to the housing 23, and the other end overlaps the movable end of the angle adjustment assembly 26. The first clamping bolt 24 is threaded through the movable plate 25 and abuts against the surface of the ultrasonic transducer 22. The distance between the transmitting end component 2 and the receiving end component 3 is adjusted by the distance adjustment component 4. The main housing 1 and the test piece 100 are bound together by a strip 6.

[0032] The first clamping bolt 24 is threadedly connected to the movable plate 25, and the ultrasonic transducer 22 is pressed into the rubber wedge block 21 by the first clamping bolt 24.

[0033] The main housing 1 is bound to the test piece 100 by the strip 6 to prevent the LCR wave sensor assembly from falling off the test piece 100. The length of the strip 6 is adjustable, thus, by adjusting the length of the strip 6, the LCR wave sensor assembly can be fixed to the test piece 100 of different diameters.

[0034] The outer shell 23 is used to fix the rubber wedge 21.

[0035] The tilt angle of the movable plate 25 is adjusted by the angle adjustment component 26, utilizing the flexibility of the rubber wedge to adjust the tilt angle of the ultrasonic transducer 22, thereby adjusting the incident angle of the sensor assembly. This is crucial for the generation of LCR waves because the first critical refraction angle is closely related to the sound velocity of the measured material, and this angle differs when measuring different materials. The angle between the ultrasonic transducer in the transmitting end assembly 2 and the normal direction is the first critical refraction angle. α According to Snell's law, the following can be calculated: α=arcsin(V W / V M ) Where V W V is the ultrasonic longitudinal wave velocity in the rubber wedge 21. M The ultrasonic longitudinal wave velocity in the tested component 100 is denoted as 100.

[0036] The ultrasonic transducer 22 at the transmitting end and the ultrasonic transducer 22 at the receiving end are used to excite and receive ultrasonic waves, respectively. The rubber wedge 21 is used to tightly fit against the test piece 100. Utilizing a flexible rubber with a machined arc-shaped structure as a wedge, and applying a certain clamping force to the rubber wedge 21 through the pressure regulating component 5, tight fit with test pieces of different diameters can be achieved. Simultaneously, the rubber wedge 21 serves as a coupling layer between the ultrasonic wave and the test piece 100. Its coupling characteristics can be precisely adjusted and controlled through the pressure regulating components 5 at both the transmitting and receiving ends. Compared to traditional coupling layers, it is easier to control and maintain consistent coupling characteristics. This not only ensures stable ultrasonic wave transmission but also overcomes the disadvantages of separate coupling layers or liquid coupling, thereby improving stress measurement accuracy.

[0037] The bottom arc structure of the rubber wedge 21 can be, for example, an arc-shaped through groove 211 machined at the bottom of the rubber wedge 21 to adapt to the surface of cylindrical or cylindrical test pieces with different diameters.

[0038] The pressure regulating component 5 can accurately display and adjust the clamping force on the housing 23.

[0039] The distance between the ultrasonic transducers 22 at both ends of the transmitter and receiver can be adjusted by the distance adjustment component 4, which can further adapt to test pieces 100 made of different materials and experimental conditions.

[0040] In summary, the LCR wave sensor assembly for measuring curved surface stress of the present invention is applicable to test pieces of different diameters and materials, expanding the scope of application compared with the prior art. At the same time, by adopting the rubber wedge 21, the angle adjustment assembly 26 and the distance adjustment assembly 4, the stress measurement accuracy is greatly improved.

[0041] The distance adjustment assembly 4 includes an adjustment rod 41, a worm gear 42, and a worm 43. The two ends of the worm 43 are threadedly connected to the two outer shells 23, with opposite directions of the external threads at both ends. One end of the adjustment rod 41 is mounted on the upper part of the main housing 1, and a handle 44 is fixedly attached to one end of the adjustment rod 41. The worm gear 42 is coaxially fixed to the other end of the adjustment rod 41, and meshes with the worm 43. With this design, the two ends of the worm 43 are threadedly connected to the outer shell 23 of the transmitting end and the outer shell 23 of the receiving end, respectively. To facilitate the connection between the worm 43 and the outer shell 23, a boss 232 can be machined on the upper part of the outer shell 23. The size of the boss 232 is smaller than the size of the outer shell 23, which reduces weight and facilitates machining. The handle 44 drives the adjusting rod 41 to rotate, which in turn drives the worm gear 42 to rotate, and in turn drives the worm 43 meshing with the worm gear 42 to rotate. Since the two ends of the worm 43 are machined with external threads in opposite directions, the distance between the transmitter assembly 2 and the receiver assembly 3 is adjusted synchronously. The upper part of the main housing 1 is machined with a through hole for installing the adjusting rod 41.

[0042] A compression spring 45 is connected between the other end of the adjusting rod 41 and the upper part of the main housing 1. With this design, a bracket can be installed on the other end of the adjusting rod 41, the lower end of the compression spring 45 is fixed on the bracket, and the upper end is fixed on the top of the main housing 1. When adjusting the pressure of the transmitter assembly 2 and the receiver assembly 3, the compression spring 45 keeps the worm gear 42 and the worm 43 in close contact.

[0043] The pressure regulating assembly 5 includes a second clamping bolt 51, a clamping nut 52, and a pressure sensor 53. The top of the main housing 1 has two first limiting elongated holes 11, which are stepped holes. The two clamping nuts 52 are correspondingly arranged in the large diameter sections of the two first limiting elongated holes 11, and the clamping nuts 52 are circumferentially limited by the inner wall of the large diameter section of the first limiting elongated holes 11. The second clamping bolt 51 is threaded through the clamping nut 52, and the two second clamping bolts 51 are correspondingly inserted into the small diameter sections of the two first limiting elongated holes 11. The pressure sensor 53 is installed between the second clamping bolt 51 and the top of the housing 23. This design limits the circumferential movement of the clamping nut 52 by the inner wall of the large-diameter section of the first limiting elongated hole 11, preventing circumferential rotation and allowing it to move only along the length of the first limiting elongated hole 11. This enables the application of pressure to the housing 23 by rotating the second clamping bolt 51, thereby ensuring a tight fit between the rubber wedge 21 and the workpiece 100. The pressure sensor 53 is preferably fixedly mounted to the end of the second clamping bolt 51. By accurately displaying the clamping force on the two housings 23, the contact characteristics between the two rubber wedges 21 and the workpiece 100 can be controlled to be consistent.

[0044] The length of the first limiting elongated hole 11 is equal to the maximum distance that the ultrasonic transducer 22 can move.

[0045] The angle adjustment assembly 26 includes a mounting base 261, a knob 262, and a slider 263. The mounting base 261 is fixedly mounted on the lower part of the housing 23. The upper part of the mounting base 261 has an upward-facing groove 264. The knob 262 is rotatably inserted into the upper part of the mounting base 261, with one end of the knob located within the groove 264. A gear is mounted on one end of the knob 262. The slider 263 is vertically slidably inserted into the groove 264, and a rack that meshes with the gear is vertically mounted on the slider 263. The other end of the movable plate 25 overlaps the top of the slider 263. With this design, the slider 263 is the movable end of the angle adjustment assembly 26. By rotating the knob 262, the slider 263 moves vertically, thereby changing the angle between the movable plate 25 and the ultrasonic transducer 22. Then, by tightening the first clamping bolt 24, the flexible properties of the rubber wedge allow for adjustment of the incident angle of the ultrasonic transducer.

[0046] Two angle adjustment components 26 are installed at opposite ends of the two housings. This design facilitates angle adjustment.

[0047] Both the main housing 1 and the outer shell 23 are inverted U-shaped structures. With this design, the transmitter assembly 2 and the receiver assembly 3 are respectively arranged at the two ends of the main housing 1, which facilitates the installation of the transmitter assembly 2 and the receiver assembly 3, as well as the angle adjustment of the ultrasonic transducer 22.

[0048] The rubber wedge 21 has stepped surfaces 212 machined on both sides of its lower part. The bottom end of the outer shell 23 overlaps on the stepped surfaces 212. The upper part of the rubber wedge 21 has a first limiting through hole 213, and the upper part of the outer shell 23 has a second limiting through hole 231. The first limiting through hole 213 and the second limiting through hole 231 are arranged coaxially. This design ensures that the outer shell 23 and the rubber wedge 21 remain synchronized when displacement changes. To ensure that the outer shell 23 and the rubber wedge 21 do not deflect during the test, there are two of each of the first limiting through hole 213 and the second limiting through hole 231, arranged in a one-to-one correspondence. The axes of the two first limiting through holes 213 are staggered vertically, which facilitates the connection with the main shell 1 and the lateral displacement adjustment of the transmitter assembly 2 and the receiver assembly 3 relative to the main shell 1 when adjusting the distance between them.

[0049] Second limiting elongated holes 12 are machined laterally on both sides of the main housing 1 of the transmitter assembly 2 and both sides of the main housing 1 of the receiver assembly 3. The first limiting through hole 213, the second limiting through hole 231, and the second limiting elongated hole 12 are arranged coaxially. The connection between the transmitter assembly 2 and the main housing 1, and between the receiver assembly 3 and the main housing 1, is achieved by inserting fixing bolts 7 into the second limiting elongated holes 12, the second limiting through holes 231, and the first limiting through hole 213. In this design, the height of the second limiting elongated hole 12 is aligned with the direction shown in the figure. The axes of the two limiting through holes are on the same horizontal plane as the axis of the second limiting elongated hole 12, and the diameters of the two limiting through holes are smaller than the height of the second limiting elongated hole 12, ensuring longitudinal freedom when adjusting the rubber wedge 21. The transmitter assembly 2 and the main housing 1, and the receiver assembly 3 and the main housing 1, are fixed together by the fixing bolts 7.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An LCR wave sensor assembly for measuring surface stress, characterized in that: It includes a main housing (1) and a transmitter assembly (2), a receiver assembly (3), and a distance adjustment assembly (4) disposed inside the main housing (1), wherein, Two sets of pressure regulating components (5) are installed on the upper part of the main housing (1). The two sets of pressure regulating components (5) are used to adjust the clamping force between the transmitting end component (2) and the test object (100) and between the receiving end component (3) and the test object (100). The transmitter assembly (2) and receiver assembly (3) have the same structure and are arranged symmetrically about the distance adjustment assembly (4). The transmitting end assembly (2) includes a rubber wedge (21), an ultrasonic transducer (22), a housing (23), a first clamping bolt (24), a movable plate (25), and an angle adjustment assembly (26). The bottom of the rubber wedge (21) has an arc-shaped structure and is in contact with the surface of the test piece (100). The housing (23) covers the rubber wedge (21) and is fixedly connected to the rubber wedge (21). The pressure adjustment assembly (5) is correspondingly arranged above the housing (23). The inclined surface of the block (21) and the inclined surface of the receiving end rubber wedge block (21) are distributed in a figure-eight shape. The ultrasonic transducer (22) is correspondingly embedded on the inclined surface of the rubber wedge block (21). The angle adjustment component (26) is installed on the main housing (1). One end of the movable plate (25) is hinged to the outer shell (23), and the other end overlaps above the movable end of the angle adjustment component (26). The first clamping bolt (24) is threaded through the movable plate (25) and abuts against the surface of the ultrasonic transducer (22). The distance between the transmitter assembly (2) and the receiver assembly (3) is adjusted by the distance adjustment component (4). The main housing (1) and the test piece (100) are bound together by a strip (6).

2. The LCR wave sensor assembly for measuring surface stress according to claim 1, characterized in that: The distance adjustment assembly (4) includes a distance adjustment rod (41), a worm gear (42) and a worm (43). The two ends of the worm (43) are threaded to the two outer shells (23) respectively, and the external threads at the two ends of the worm (43) are opposite in direction. One end of the distance adjustment rod (41) is mounted on the upper part of the main shell (1), and a handle (44) is fixedly mounted on one end of the distance adjustment rod (41). The worm gear (42) is coaxially fixedly mounted on the other end of the distance adjustment rod (41), and the worm gear (42) meshes with the worm (43).

3. The LCR wave sensor assembly for measuring surface stress according to claim 2, characterized in that: A compression spring (45) is provided between the other end of the adjusting rod (41) and the upper part of the main housing (1).

4. The LCR wave sensor assembly for measuring surface stress according to claim 1, characterized in that: The pressure regulating assembly (5) includes a second clamping bolt (51), a clamping nut (52), and a pressure sensor (53). The top of the main housing (1) has two first limiting elongated holes (11). The first limiting elongated holes (11) are stepped holes. The two clamping nuts (52) are respectively set in the large diameter section of the two first limiting elongated holes (11), and the clamping nuts (52) are circumferentially limited by the inner wall of the large diameter section of the first limiting elongated holes (11). The second clamping bolt (51) is threaded into the clamping nut (52), and the two second clamping bolts (51) are respectively installed in the small diameter section of the two first limiting elongated holes (11). The pressure sensor (53) is installed between the second clamping bolt (51) and the top of the housing (23).

5. An LCR wave sensor assembly for measuring surface stress according to claim 4, characterized in that: The length of the first limiting elongated hole (11) is equal to the maximum distance that the ultrasonic transducer (22) can move.

6. The LCR wave sensor assembly for measuring surface stress according to claim 1, characterized in that: The angle adjustment assembly (26) includes a mounting base (261), a knob (262), and a slider (263). The mounting base (261) is fixedly mounted on the lower part of the outer shell (23). The upper part of the mounting base (261) has an upward-facing groove (264). The knob (262) is rotatably inserted into the upper part of the mounting base (261), and one end of the knob is located in the groove (264). One end of the knob (262) is equipped with a gear. The slider (263) is vertically slidably inserted into the groove (264), and a rack that meshes with the gear is vertically mounted on the slider (263). The other end of the movable plate (25) overlaps the top of the slider (263).

7. An LCR wave sensor assembly for measuring surface stress according to claim 6, characterized in that: Two angle adjustment components (26) are installed at opposite ends of the two housings (23).

8. An LCR wave sensor assembly for measuring surface stress according to claim 1, characterized in that: Both the main shell (1) and the outer shell (23) are inverted U-shaped structures.

9. An LCR wave sensor assembly for measuring surface stress according to claim 1, characterized in that: The rubber wedge (21) has stepped surfaces (212) on both sides of its lower part. The bottom end of the outer shell (23) overlaps on the stepped surfaces (212). The rubber wedge (21) has a first limiting through hole (213) on its upper part. The outer shell (23) has a second limiting through hole (231) on its upper part. The first limiting through hole (213) and the second limiting through hole (231) are arranged coaxially.

10. An LCR wave sensor assembly for measuring surface stress according to claim 9, characterized in that: The main housing (1) on both sides of the transmitter assembly (2) and the main housing (1) on both sides of the receiver assembly (3) are machined with second limiting elongated holes (12) along the transverse direction. The first limiting through hole (213), the second limiting through hole (231) and the second limiting elongated hole (12) are arranged coaxially. The connection between the transmitter assembly (2) and the main housing (1) and the receiver assembly (3) and the main housing (1) is realized by inserting the fixing bolt (7) into the second limiting elongated hole (12), the second limiting through hole (231) and the first limiting through hole (213).

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