Testing support and ultrasonic testing device

Abstract

The utility model relates to a testing support and ultrasonic testing device, the testing support comprises a support body, a piezoelectric sensor, a caulking piece, an elastic piece and a pressing device, the support body comprises a supporting plate, the supporting plate is provided with a first surface and a second surface which are oppositely arranged along a first direction, the support body is provided with a first surface and a second surface, the first surface is provided with a groove recessed towards the second surface, one end of the elastic piece is fixed on the bottom wall of the groove, the piezoelectric sensor is fixed on the other end of the elastic piece, and the gap filling piece is used for filling a gap between the piezoelectric sensor and the end face of one end, close to the support body, of a threaded piece to be detected. According to the test support, the piezoelectric sensor does not need to be pasted one day before the test, the test preparation time is saved, and the test efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the field of testing technology, and in particular relates to a testing bracket and an ultrasonic testing device. Background Art

[0002] Ultrasonic axial force testing is a non-destructive testing method that does not require destroying the original connection structure. It is simple to operate and low in cost, so ultrasonic axial force testers are often used to measure the axial force.

[0003] When testing a bolt, an existing ultrasonic axial force tester uses an ultrasonic probe tip against a sensor attached to the bolt head. The ultrasonic signal emitted by the probe enters the bolt through the sensor, travels along the entire length of the bolt, and is reflected back at the bolt's end face. By comparing the propagation time difference between the original (untightened) bolt and the tightened bolt, the difference in bolt length before and after tightening is calculated, and the resulting axial force is then determined.

[0004] In the existing technology, the sensor (piezoelectric ceramic piece) is first glued to the center of the bolt head plane. After the glue solidifies, the ultrasonic probe is attached to the bolt head plane to ensure that the probe of the ultrasonic probe (electrical signal transmission rod) is against the sensor.

[0005] However, the existing technology requires the sensor to be glued to the bolt head in advance. Since the glue takes a long time to cure, the sensor usually needs to be glued at least one day in advance, which increases the test preparation time and reduces the test efficiency. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a test bracket and an ultrasonic test device to shorten the ultrasonic axial force test time of threaded parts such as bolts.

[0007] In order to solve the above problems, on the one hand, an embodiment of the present invention provides a test bracket, including a bracket body, a piezoelectric sensor, a caulking member, an elastic member and a pressing device, wherein the bracket body includes a support plate, the support plate having a first surface and a second surface arranged opposite to each other along a first direction, the first surface being provided with a groove recessed toward the second surface, one end of the elastic member being fixed to the bottom wall of the groove, the piezoelectric sensor being fixed to the other end of the elastic member, and the caulking member being used to fill a gap between the piezoelectric sensor and an end surface of a threaded member to be tested close to the bracket body;

[0008] The bracket body is provided with a first through hole penetrating the bottom wall and the second surface of the groove along the first direction, and the elastic member is provided with a second through hole penetrating along the first direction, the first through hole and the second through hole being connected to form a test through hole suitable for a probe of an ultrasonic probe to pass through;

[0009] The pressing device is connected to the bracket body and is used to apply force to the bracket body to compress the elastic member, thereby allowing the first surface and the filler to fit the end surface of the threaded member to be tested close to the bracket body.

[0010] According to the test bracket of the present invention, during testing, the clamping device presses the first surface of the support plate and the caulking member tightly against the end face of the threaded member to be tested that is close to the bracket body. Since the caulking member fills the gap between the piezoelectric sensor and the end face of the threaded member to be tested that is close to the bracket body, the ultrasonic signal emitted by the ultrasonic probe can pass through the piezoelectric sensor and the caulking member and enter the threaded member to be tested. By testing the threaded member to be tested in its original state (untightened) and after being tightened, the time difference in the propagation of the ultrasonic waves between the untightened threaded member to be tested and the tightened threaded member to be tested is compared to calculate the length of the threaded member to be tested that is stretched after being tightened, and then calculate the axial force of the threaded member to be tested after being tightened. It can be seen that the test bracket of the present invention does not require the piezoelectric sensor to be attached one day in advance before the test, which saves test preparation time and improves test efficiency.

[0011] In addition, the piezoelectric sensor, the elastic member and the bracket body are integrated into one body, and the piezoelectric sensor can be easily detached from the threaded member to be tested, so that the piezoelectric sensor can be reused and the test cost can be saved.

[0012] Optionally, when the elastic member is not compressed, the piezoelectric sensor protrudes from the groove;

[0013] When the first surface and the caulking member are in contact with the threaded member to be tested and close to one end surface of the bracket body, the elastic member and the piezoelectric sensor are both accommodated in the groove;

[0014] When the force applied by the pressing device to the bracket body is released, the elastic member can recover its deformation.

[0015] Optionally, the elastic member is a sponge block, a spring, a spring or a flexible rubber member.

[0016] Optionally, the filler is a flexible rubber pad or adhesive layer.

[0017] Optionally, the piezoelectric sensor is a piezoelectric ceramic piece.

[0018] Optionally, the groove is a cylindrical groove, the elastic member is annular, and the piezoelectric sensor is in the shape of a circular sheet.

[0019] Optionally, the first through hole and the second through hole are circular holes, and the first through hole and the second through hole are coaxially arranged.

[0020] Optionally, the support plate is provided with a first marking hole and a second marking hole extending along the first direction, and the shapes and / or sizes of the first marking hole and the second marking hole are different. The first marking hole can form a first mark on the end face of the threaded component to be measured close to the bracket body, and the second marking hole can form a second mark different from the first mark on the end face of the threaded component to be measured close to the bracket body.

[0021] Optionally, the first marking hole and the second marking hole are both circular holes, and the aperture of the first marking hole is larger than the aperture of the second marking hole.

[0022] Optionally, the support plate is a long strip extending in a second direction perpendicular to the first direction, and the bracket body further includes a first handle plate and a second handle plate connected to both ends of the support plate in the longitudinal direction;

[0023] The first handle plate and the second handle plate protrude from the support plate in a direction away from the first surface.

[0024] Optionally, the first handle plate includes a first connecting portion extending along the first direction and a first handle portion extending along the second direction, and the first handle portion protrudes from the first connecting portion in a direction away from the support plate;

[0025] The second handle plate includes a second connecting portion extending along the first direction and a second handle portion extending along the second direction, and the second handle portion protrudes from the second connecting portion in a direction away from the support plate.

[0026] Optionally, one end of the elastic member close to the second surface is glued to the bottom wall of the groove, and one end of the elastic member away from the second surface is glued to the piezoelectric sensor.

[0027] Optionally, the filler is an adhesive layer, and the adhesive layer is bonded between the piezoelectric sensor and an end surface of the threaded member to be measured close to the bracket body;

[0028] The adhesive force between the adhesive layer and the piezoelectric sensor is greater than the adhesive force between the adhesive layer and an end surface of the threaded component to be tested close to the bracket body, so that the piezoelectric sensor can be separated from the threaded component to be tested.

[0029] Optionally, the bracket body is a magnetic conductive member, the pressing device is a permanent magnet, and the permanent magnet is magnetically attracted to the second surface, so that the support plate can be magnetically attracted to an end surface of the threaded member to be tested close to the bracket body;

[0030] The permanent magnet can also magnetically fix the ultrasonic probe.

[0031] Optionally, the permanent magnet has a through hole in the middle, and a column protruding away from the first surface is formed on the bottom of the groove on a side away from the first surface, and the permanent magnet is sleeved on the outer periphery of the column;

[0032] The first through hole is formed on the column and penetrates the column along the first direction.

[0033] Optionally, the permanent magnet is in a ring shape, and the column is a cylinder.

[0034] Optionally, the pressing device is an electromagnet, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder or a linear motor.

[0035] On the other hand, an embodiment of the present invention provides an ultrasonic testing device, comprising an ultrasonic probe and the above-mentioned test bracket, wherein the ultrasonic probe is connected to the bracket body or the clamping device, and the probe of the ultrasonic probe can pass through the test through hole and abut against the piezoelectric sensor;

[0036] The ultrasonic signal emitted by the ultrasonic probe enters the threaded part to be tested through the piezoelectric sensor and the caulking piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a three-dimensional diagram of a test stand provided by an embodiment of the present utility model;

[0038] Figure 2 This is an exploded view of a test stand provided in one embodiment of the present utility model;

[0039] Figure 3 yes Figure 2 Another perspective of the picture;

[0040] Figure 4 This is a test schematic diagram of an ultrasonic testing device provided by an embodiment of the present utility model.

[0041] Description of reference numerals:

[0042] 1. Bracket body; 11. Support plate; 111. First surface; 112. Second surface; 113. Groove; 114. First through hole; 115. First marking hole; 116. Second marking hole; 117. Column; 12. First handle plate; 121. First connecting portion; 122. First handle portion; 13. Second handle plate; 131. Second connecting portion; 132. Second handle portion;

[0043] 2. Piezoelectric sensor;

[0044] 3. Elastic member; 31. Second through hole;

[0045] 4. Permanent magnet; 41. Perforation;

[0046] 10. Threaded parts to be tested;

[0047] 20. Ultrasonic probe; 201. Probe. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to 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.

[0049] like Figures 1 to 4 As shown, an embodiment of the present invention provides a test bracket, including a bracket body 1, a piezoelectric sensor 2, a caulking member, an elastic member 3 and a clamping device, wherein the bracket body 1 includes a support plate 11, the support plate 11 having a first surface 111 and a second surface 112 arranged opposite to each other along a first direction, the first surface 111 being provided with a groove 113 recessed toward the second surface 112, one end of the elastic member 3 being fixed to the bottom wall of the groove 113, the piezoelectric sensor 2 being fixed to the other end of the elastic member 3, and the caulking member being used to fill the gap between the piezoelectric sensor 2 and an end face of the threaded member 10 to be tested close to the bracket body 1. The bracket body 1 is provided with a first through hole 114 extending through the bottom wall of the groove 113 and the second surface 112 along the first direction, the elastic member 3 is provided with a second through hole 31 extending through the first direction, the first through hole 114 being connected to the second through hole 31 to form a test through hole suitable for the probe 201 of the ultrasonic probe 20 to pass through. The pressing device is connected to the bracket body 1 and is used to apply force to the bracket body 1 to compress the elastic member 3 so that the first surface 111 and the filler can fit the end surface of the threaded member 10 to be tested close to the bracket body 1.

[0050] In this paper, the first direction and the second direction are Figure 1 The directions indicated by lines a and b in .

[0051] According to the test bracket of the utility model, during testing, the clamping device presses the first surface 111 of the support plate 11 and the caulking member tightly against the end face of the threaded member 10 to be tested close to the bracket body 1. Since the caulking member fills the gap between the piezoelectric sensor 2 and the end face of the threaded member to be tested close to the bracket body 1, the ultrasonic signal emitted by the ultrasonic probe 20 can enter the threaded member 10 to be tested through the piezoelectric sensor 2 and the caulking member, avoiding the ultrasonic signal from being interrupted at the gap between the piezoelectric sensor 2 and the end face of the threaded member to be tested close to the bracket body 1, thereby ensuring that the ultrasonic signal can propagate throughout the entire process in the solid. The test bracket of the utility model does not require the piezoelectric sensor 2 to be attached one day in advance before the test, which saves test preparation time and improves test efficiency.

[0052] In addition, the piezoelectric sensor 2, the elastic member 3 and the bracket body 1 are integrated into one body, and the piezoelectric sensor 2 can be easily separated from the threaded member 10 to be tested, so that the piezoelectric sensor 2 can be reused and the test cost can be saved.

[0053] See also Figure 4 In one embodiment, the threaded member 10 to be tested is a bolt, and the end surface of the threaded member 10 to be tested close to the bracket body 1 is the head plane of the bolt. However, in other embodiments, the threaded member 10 to be tested may also be a stud, or other threaded fasteners with similar structures.

[0054] In one embodiment, when the elastic member 3 is not compressed, the piezoelectric sensor 2 protrudes from the groove 113; when the first surface 111 and the caulking member are in contact with the end face of the threaded member 10 to be tested, close to the end face of the bracket body 1, the elastic member 3 and the piezoelectric sensor 2 are both accommodated in the groove 113; when the force applied by the clamping device to the bracket body 1 is released, the elastic member 3 can recover its deformation. In other words, the groove 113 provides deformation space for the elastic member 3, allowing the first surface 111 of the support plate 11 and the caulking member to form good contact with the end face of the threaded member 10 to be tested, close to the end face of the bracket body 1. In addition, the elastic member 3 can provide a buffer to prevent the piezoelectric sensor 2 from being crushed.

[0055] In one embodiment, the elastic member 3 is a sponge block. However, in other embodiments, the elastic member 3 can also be a spring or a flexible rubber member.

[0056] In one embodiment, the filler is an adhesive layer. The piezoelectric sensor 2 is connected to the threaded member 10 to be tested via the adhesive layer. The main function of the adhesive layer is to fill the gap between the piezoelectric sensor 2 and the end face of the threaded member to be tested that is close to the bracket body 1, so that the ultrasonic signal emitted by the ultrasonic probe 20 can smoothly enter the threaded member 10 to be tested through the piezoelectric sensor 2 and the filler, thereby preventing the ultrasonic signal from being reflected in the gap between the piezoelectric sensor 2 and the threaded member to be tested. Therefore, the viscosity of the adhesive layer is relatively unimportant and can be set to a relatively low viscosity. However, in other embodiments, a solid filler, such as a flexible rubber pad, may also be used.

[0057] In one embodiment, the piezoelectric sensor 2 is a piezoelectric ceramic sheet. The piezoelectric ceramic sheet is a piezoelectric polycrystalline material. However, in other embodiments, the piezoelectric sensor 2 may also be a piezoelectric single crystal or an organic piezoelectric material.

[0058] In one embodiment, see Figure 2 and Figure 3 The piezoelectric sensor 2 is in the shape of a circular sheet, the groove 113 is a cylindrical groove, and the elastic member 3 is in the shape of a ring. The outer edge of the circular sheet-shaped piezoelectric sensor 2 (such as a piezoelectric ceramic sheet) is relatively smooth and not prone to cracking.

[0059] However, in other embodiments, the piezoelectric sensor 2 may also be a polygonal shape such as a triangle or a quadrilateral, and the shapes of the groove 113 and the elastic member 3 may be adapted to the shape of the piezoelectric sensor 2. The piezoelectric sensor 2 may also be an ellipse, and the piezoelectric sensor 2 may be a regular shape or an irregular shape.

[0060] In one embodiment, see Figure 2 and Figure 3 The first through hole 114 and the second through hole 31 are circular holes, and the first through hole 114 and the second through hole 31 are coaxially arranged. The first through hole 114 and the second through hole 31 have the same inner diameter. Circular holes are easy to machine, and their inner walls are smooth, which is not likely to damage the probe 201 of the ultrasonic probe 20.

[0061] In one embodiment, see Figure 2 and Figure 3The support plate 11 is provided with a first marking hole 115 and a second marking hole 116 that pass through along the first direction. The first marking hole 115 and the second marking hole 116 have different shapes and / or sizes. The first marking hole 115 can form a first mark on the end surface of the threaded component 10 to be tested that is close to the bracket body 1, and the second marking hole 116 can form a second mark different from the first mark on the end surface of the threaded component 10 to be tested that is close to the bracket body 1. In this way, when testing the threaded component 10 to be tested in its original state (untightened), the first marking hole 115 can form a first mark on the end surface of the threaded component 10 to be tested that is close to the bracket body 1, and the second marking hole 116 can form a second mark different from the first mark on the end surface of the threaded component 10 to be tested that is close to the bracket body 1. Then, when testing the tightened threaded member 10 to be tested, the first marking hole 115 is aligned as much as possible with the first mark on the threaded member 10 to be tested, and the second marking hole 116 is aligned as much as possible with the second mark on the threaded member 10 to be tested, so that when the original state (not tightened) threaded member 10 to be tested and the tightened threaded member 10 to be tested are tested respectively, the end face of the threaded member 10 to be tested close to the bracket body 1 maintains approximately the same position as the bracket body 1, so as to enhance the accuracy of the test.

[0062] In one embodiment, both first marking hole 115 and second marking hole 116 are circular holes, and the diameter of first marking hole 115 is larger than that of second marking hole 116. For example, a paintbrush can be passed through first marking hole 115 to draw a circle to form a first mark, and a paintbrush can be passed through second marking hole 116 to draw a circle to form a second mark. Since the diameter of first marking hole 115 is larger than that of second marking hole 116, incorrect installation during two tests can be prevented.

[0063] In one embodiment, see Figure 2 The support plate 11 is a long strip extending along a second direction perpendicular to the first direction, and the bracket body 1 also includes a first handle plate 12 and a second handle plate 13 connected at both ends of the length direction of the support plate 12; the first handle plate 12 and the second handle plate 13 protrude from the support plate 11 in a direction away from the first surface 111.

[0064] In one embodiment, see Figure 2The first handle plate 12 includes a first connection portion 121 extending along the first direction and a first handle portion 122 extending along the second direction, and the first handle portion 122 protrudes from the first connection portion 121 in a direction away from the support plate 11; the second handle plate 13 includes a second connection portion 131 extending along the first direction and a second handle portion 132 extending along the second direction, and the second handle portion 132 protrudes from the second connection portion 131 in a direction away from the support plate 11.

[0065] In one embodiment, one end of the elastic member 3 close to the second surface 112 is glued to the bottom wall of the groove 113 , and one end of the elastic member 3 away from the second surface 112 is glued to the piezoelectric sensor 2 .

[0066] In one embodiment, the caulking member is an adhesive layer that is bonded between the piezoelectric sensor 2 and the end surface of the threaded member 10 to be tested that is close to the bracket body 1. The adhesive force between the adhesive layer and the piezoelectric sensor 2 is greater than the adhesive force between the adhesive layer and the end surface of the threaded member 10 to be tested that is close to the bracket body 1, so that the piezoelectric sensor 2 can be separated from the threaded member 10 to be tested. In this way, after the test is completed, the entire test bracket can be easily separated from the threaded member 10 to be tested.

[0067] In one embodiment, see Figure 2 The bracket body 1 is a magnetically conductive member, such as a sheet metal. The clamping device is a permanent magnet 4, which is magnetically attracted to the second surface 112, allowing the support plate 11 to be magnetically attracted to the end surface of the threaded member 10 to be tested, which is closest to the bracket body 1. The permanent magnet 4 can also magnetically secure the ultrasonic probe 20. This simplifies the securing method for the ultrasonic probe 20.

[0068] However, in other embodiments, the ultrasonic probe 20 may also be fixed on the support body 1. The ultrasonic probe 20 may also be fixed on other stationary components outside the test support.

[0069] In one embodiment, see Figure 2 and Figure 3 The permanent magnet 4 has a through hole 41 in the middle, and a column 117 protruding away from the first surface 111 is formed on the bottom of the groove 113 on the side away from the first surface 111, and the permanent magnet 4 is sleeved on the outer periphery of the column 117; the first through hole 114 is formed on the column 117 and penetrates the column 117 along the first direction.

[0070] In one embodiment, see Figure 3The permanent magnet 4 is in a ring shape, the inner hole of the permanent magnet 4 is a circular hole, and the column 117 is a cylinder adapted to the shape of the inner hole of the permanent magnet 4.

[0071] However, in other embodiments, the inner hole of the permanent magnet 4 may be a polygonal hole such as a triangular hole, a quadrilateral hole, or an elliptical hole. The inner hole of the permanent magnet 4 may be a regular shape or an irregular shape. The clamping device may also be an electromagnet, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, or a linear motor.

[0072] In existing technology, when measuring axial force on bolts installed inside engines and transmissions, there's a risk of piezoelectric ceramic discs falling off due to oil disturbance. This not only prevents axial force measurement but also poses a performance risk to the engine and transmission. Because the test stand in this embodiment doesn't pre-attach the piezoelectric sensor 2 (piezoelectric ceramic disc), there's no need to worry about the piezoelectric sensor 2 falling off when testing bolts inside engines and transmissions, potentially creating performance and safety hazards.

[0073] In the prior art, when testing the bolt axial force of a vehicle after a durability test, traditional piezoelectric ceramic sheet bonding solutions often result in the piezoelectric ceramic sheet falling off or being damaged, making it impossible to complete the measurement. With the test stand of the present utility model, the piezoelectric sensor 2 will not fall off after the vehicle completes the endurance test, preventing the axial force measurement from being impossible.

[0074] On the other hand, see Figure 4 An embodiment of the present invention also provides an ultrasonic testing device, including an ultrasonic probe 20 and the test bracket of the above embodiment, wherein the ultrasonic probe 20 is connected to the bracket body 1 or the clamping device, and the probe 201 of the ultrasonic probe 20 can pass through the test through hole and abut against the piezoelectric sensor 2; the ultrasonic signal emitted by the ultrasonic probe 20 enters the threaded part 10 to be tested through the piezoelectric sensor 2 and the filler.

[0075] In the embodiment where the pressing device is the permanent magnet 4 , the ultrasonic probe 20 is directly adsorbed on the bracket body 1 through the permanent magnet 4 , which has a simple structure, fewer parts, and low cost.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test stand, characterized in that: The invention comprises a bracket body, a piezoelectric sensor, a caulking member, an elastic member and a pressing device, wherein the bracket body comprises a support plate, the support plate having a first surface and a second surface arranged opposite to each other along a first direction, the first surface being provided with a groove recessed toward the second surface, one end of the elastic member being fixed to the bottom wall of the groove, the piezoelectric sensor being fixed to the other end of the elastic member, and the caulking member being used to fill the gap between the piezoelectric sensor and an end surface of the threaded member to be tested close to the bracket body; The bracket body is provided with a first through hole penetrating the bottom wall and the second surface of the groove along the first direction, and the elastic member is provided with a second through hole penetrating along the first direction, the first through hole and the second through hole being connected to form a test through hole suitable for a probe of an ultrasonic probe to pass through; The pressing device is connected to the bracket body and is used to apply force to the bracket body to compress the elastic member, thereby allowing the first surface and the filler to fit the end surface of the threaded member to be tested close to the bracket body.

2. The test stand according to claim 1, characterized in that When the elastic member is not compressed, the piezoelectric sensor protrudes from the groove; When the first surface and the caulking member are in contact with the threaded member to be tested and close to one end surface of the bracket body, the elastic member and the piezoelectric sensor are both accommodated in the groove; When the force applied by the pressing device to the bracket body is released, the elastic member can recover its deformation.

3. The test stand according to claim 1, characterized in that The support plate is provided with a first marking hole and a second marking hole penetrating along the first direction, and the first marking hole and the second marking hole have different shapes and / or sizes. The first marking hole can form a first mark on the end surface of the threaded component to be measured close to the bracket body, and the second marking hole can form a second mark different from the first mark on the end surface of the threaded component to be measured close to the bracket body.

4. The test stand according to claim 1, wherein: The support plate is a long strip extending in a second direction perpendicular to the first direction, and the bracket body further includes a first handle plate and a second handle plate connected to both ends of the support plate in the longitudinal direction; The first handle plate and the second handle plate protrude from the support plate in a direction away from the first surface.

5. The test stand according to claim 4, characterized in that: The first handle plate includes a first connecting portion extending along the first direction and a first handle portion extending along the second direction, wherein the first handle portion protrudes from the first connecting portion in a direction away from the support plate; The second handle plate includes a second connecting portion extending along the first direction and a second handle portion extending along the second direction, and the second handle portion protrudes from the second connecting portion in a direction away from the support plate.

6. The test stand according to claim 1, characterized in that: One end of the elastic member close to the second surface is glued to the bottom wall of the groove, and one end of the elastic member away from the second surface is glued to the piezoelectric sensor.

7. The test stand according to claim 6, characterized in that: The filler is a glue layer, and the glue layer is bonded between the piezoelectric sensor and an end surface of the threaded member to be tested close to the bracket body; The adhesive force between the adhesive layer and the piezoelectric sensor is greater than the adhesive force between the adhesive layer and an end surface of the threaded component to be tested close to the bracket body, so that the piezoelectric sensor can be separated from the threaded component to be tested.

8. The test stand according to any one of claims 1 to 7, characterized in that: The bracket body is a magnetic conductive member, the pressing device is a permanent magnet, and the permanent magnet is magnetically attracted to the second surface, so that the support plate can be magnetically attracted to the end surface of the threaded member to be tested close to the bracket body; The permanent magnet can also magnetically fix the ultrasonic probe.

9. The test stand according to claim 8, characterized in that: The permanent magnet has a through hole in the middle, and a column protruding away from the first surface is formed on the bottom of the groove on a side away from the first surface, and the permanent magnet is sleeved on the outer periphery of the column; The first through hole is formed on the column and penetrates the column along the first direction.

10. An ultrasonic testing device, characterized in that: The test bracket comprises an ultrasonic probe and the test bracket according to any one of claims 1 to 9, wherein the ultrasonic probe is connected to the bracket body or the pressing device, and the probe of the ultrasonic probe can pass through the test through hole and abut against the piezoelectric sensor; The ultrasonic signal emitted by the ultrasonic probe enters the threaded part to be tested through the piezoelectric sensor and the caulking piece.

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