Ultrasonic bolt stress high-precision detection device and detection method

Abstract

The invention relates to the technical field of bolt detection, and discloses an ultrasonic bolt stress high-precision detection device and method, and the device comprises a support seat and an ultrasonic detector disposed in the support seat. The support seat is of a box body structure with openings in the top and the front part, and a group of clamping rod assemblies which are matched with each other to clamp a bolt test piece are arranged in the support seat; a detection moving assembly which drives the clamping rod assembly to rotate and synchronously drives the ultrasonic detector to horizontally move is further arranged in the support base. Through the detection moving assembly, the clamping rod assembly drives the bolt test piece to rotate in the support seat, and meanwhile, the ultrasonic detector horizontally moves to perform uniform searchlighting detection on all positions of the surface of the bolt test piece; the crack on the bolt test piece can be conveniently and quickly found, so that the comprehensiveness of crack detection of the bolt test piece is effectively improved, the situation that local omission is easily caused during manual crack detection is greatly reduced, the detection accuracy is higher, the detection operation and the overall structure are simpler, and the use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt detection, and in particular to an ultrasonic bolt stress high-precision detection device and a detection method. Background Art

[0002] Bolts are commonly used mechanical parts in daily life. Their actual use range is very wide and they can be used in various fields. If they are used in some fields with very high requirements, the material and quality requirements of the bolts are very strict. Therefore, before the bolts are used, they need to be ultrasonically tested. The stress of the bolts during the force process is analyzed by ultrasound. The staff uses the ultrasonic test values ​​to determine whether the bolts are suitable for actual use.

[0003] For example, the patent document with the publication number CN111537621A discloses a device called ultrasonic detection of bolt stress, which includes a bottom plate, a hydraulic cylinder, a slide groove, a limit plate and a sleeve, wherein a limit plate is welded to one end of the upper surface of the bottom plate, a limit groove is provided inside the limit plate, and slots are provided on both sides of the limit plate, a hydraulic cylinder is provided at the other end of the upper surface of the bottom plate, a travel rod is provided at one end of the hydraulic cylinder, a push block is installed at the end of the travel rod away from the hydraulic cylinder, a groove is provided on the outer wall of the push block away from the hydraulic cylinder, a sleeve is provided between the hydraulic cylinder and the limit plate, an ultrasonic generator and an ultrasonic acquisition module are provided inside the sleeve, a connecting plate is installed on the lower surface of the sleeve, and a slide groove is provided on the upper surface of the bottom plate, a slider is slidably installed inside the slide groove, and the lower end of the connecting plate is connected to the upper surface of the slider. The present invention can squeeze the bolt body by setting a hydraulic cylinder to drive the push block to move, so as to facilitate ultrasonic detection of the bolt body.

[0004] There are still some deficiencies in the above patent documents. When the detection device is used, due to the large surface area of ​​large bolts, it is easy to cause local missed detection, and small stress micro cracks are difficult to find, which affects the detection accuracy and detection efficiency, and the overall detection effect is not good. Therefore, it is necessary to provide an ultrasonic bolt stress high-precision detection device and detection method to solve the above technical problems. Summary of the invention

[0005] In view of the shortcomings still existing in the above patent documents, when the detection device is used, due to the large surface area of ​​large bolts, it is easy to cause local missed detection, and small stress micro cracks are difficult to find, which affects the detection accuracy and detection efficiency, and the overall detection effect is not good. Therefore, the present invention provides an ultrasonic bolt stress high-precision detection device and detection method.

[0006] The technical solution adopted by the present invention is: An ultrasonic bolt stress high-precision detection device comprises a bracket seat and an ultrasonic detector arranged in the bracket seat; the bracket seat is a box structure with openings on the top and the front, and is provided with a group of clamping rod assemblies that cooperate with each other to clamp a bolt test piece; the bracket seat is also provided with a detection moving assembly that drives the clamping rod assembly to rotate and synchronously drives the ultrasonic detector to move horizontally; through the detection moving assembly, the clamping rod assembly drives the bolt test piece to rotate in the bracket seat, while the ultrasonic detector moves horizontally to uniformly detect all positions on the surface of the bolt test piece.

[0007] Furthermore, the clamping rod assembly on one side of the bracket seat includes a connecting rod passing through a side wall of the bracket seat and being transmission connected to the bracket seat; the rod body section of the connecting rod on the outside of the bracket seat is transmission connected to the detection moving assembly; an electric hydraulic push rod is installed at one end of the connecting rod extending into the bracket seat, and a clamping rod a for clamping the bolt test piece is installed on the output end of the electric hydraulic push rod.

[0008] Furthermore, an outer sleeve is rotatably installed on the side wall of the other side of the bracket seat; the other clamping rod assembly includes a clamping rod b that slides through the outer sleeve and can rotate relative to the bracket seat through the outer sleeve, and the clamping rod b is at the same horizontal height as the clamping rod a; a locking bolt is threadedly connected on the tube wall of the outer sleeve, and the locking bolt can pass through the outer sleeve and cooperate with the locking hole on the clamping rod b to limit the sliding of the clamping rod b.

[0009] Furthermore, the detection moving component includes a screw rod rotatably installed in the bracket seat, a screw nut is threadedly connected to the screw rod, and one end of the screw rod extends to the outside of one side of the bracket seat; a guide block is provided on the outer side surface of the screw nut, and a guide groove for sliding with the guide block is provided on the inner wall of the bracket seat; the ultrasonic detector is fixed on the outer side surface of the screw nut, and the ultrasonic detector is located above the clamping rod a and the clamping rod b; the detection moving component also includes a joint plate installed at the outer end of the connecting rod on the bracket seat, and a gear assembly located between the screw rod and the connecting rod for transmission connection.

[0010] Furthermore, the gear assembly includes a gear a installed on the connecting rod located on the external rod body section of the bracket seat, a gear c installed on the lead screw located at the external end of the bracket seat, and a gear b installed on the outer wall of one side of the bracket seat through a shaft; gear a and gear c are located on both sides of gear b and mesh with gear b; the outer diameters of gear a and gear b are equal, and the outer diameter of gear c is 2-5 times the outer diameter of gear b.

[0011] Furthermore, a handle rod is fixed on the side of the joint plate away from the connecting rod, and a rubber sleeve is sleeved on the surface of the handle rod.

[0012] Furthermore, the ends of the clamping rod b and the clamping rod a that are close to each other are tapered ends, and a silicone layer is fixedly installed on the side surfaces of the tapered ends of the clamping rod b and the clamping rod a.

[0013] Furthermore, a support assembly for auxiliary support of the bolt test piece is provided directly below the clamping rod b and the clamping rod a in the bracket seat; the support assembly includes a support plate provided directly below the clamping rod b and the clamping rod a, and a plurality of equidistantly distributed springs are provided at the bottom of the support plate.

[0014] Furthermore, a plurality of equally spaced balls are mounted on the top surface of the support plate.

[0015] An ultrasonic bolt stress detection method is provided, which is based on the ultrasonic bolt stress high-precision detection device and comprises the following steps: S1. First, place the bolt test piece between the clamping rod a and the clamping rod b, and drive the clamping rod a to move through the output end of the electric hydraulic push rod, so that the clamping rod a cooperates with the clamping rod b to clamp the two ends of the bolt test piece, thereby clamping and fixing the bolt test piece and applying pressure to the bolt test piece at the same time; S2. Turn on the ultrasonic detector, so as to detect the bolt test piece through the ultrasonic detector; manually rotate the joint plate, and the joint plate drives the clamping rod a, the bolt test piece and the clamping rod b to rotate synchronously through the connecting rod; at the same time, the connecting rod drives the screw rod to rotate through the gear assembly, and the ultrasonic detector is moved horizontally through the screw rod, the screw rod nut, the guide groove and the guide block; S3. The ultrasonic detector fixed on the screw nut is driven to move horizontally, so that the ultrasonic detector moves horizontally while the bolt test piece rotates, thereby performing uniform searchlight detection on all positions on the surface of the bolt test piece; at the same time, since the outer diameter of gear c is larger than the outer diameter of gear a, the moving speed of the ultrasonic detector is lower than the rotation speed of the bolt test piece.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The ultrasonic bolt stress high-precision detection device drives the clamping rod assembly and the bolt test piece clamped between a group of clamping rod assemblies to rotate through the detection moving assembly, and drives the ultrasonic detector to move horizontally at the same time, so that when the bolt test piece rotates, the ultrasonic detector moves horizontally relative to it, completing uniform searchlight detection of all positions on the surface of the bolt test piece; it is convenient to quickly find cracks on the bolt test piece, thereby effectively improving the comprehensiveness of crack detection on the bolt test piece, greatly reducing the situation where local omissions are easy to occur when manually detecting cracks, and the detection accuracy is higher. The detection operation and overall structure are relatively simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 The three-dimensional diagram of the overall structure of the ultrasonic bolt stress high-precision detection device of the present invention Figure 1 ; Figure 2 The three-dimensional diagram of the overall structure of the ultrasonic bolt stress high-precision detection device of the present invention Figure 2 ; Figure 3 It is a schematic diagram of the installation of the clamping rod assembly of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure at D in FIG. Figure 5 It is a schematic diagram of the transmission structure of the detection moving assembly of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at center; Figure 7 For the present invention Figure 5 A magnified view of the structure at B in the middle; In the figure: 1. detection moving assembly; 101. locking bolt; 102. connecting rod; 103. joint plate; 104. handle rod; 105. gear a; 106. gear b; 107. gear c; 108. screw rod; 109. screw rod nut; 110. guide groove; 111. guide block; 112. outer sleeve; 2. electric hydraulic push rod; 3. support assembly; 301. support plate; 302. spring; 303. ball; 4. bracket seat; 5. bottom plate; 6. rubber pad; 7. battery; 8. ultrasonic detector; 9. clamping rod a; 10. silicone layer; 11. clamping rod b; 12. baffle; 13. rubber sleeve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] For high-precision detection of bolts, this embodiment provides an ultrasonic bolt stress high-precision detection device; Figure 1 and Figure 2As shown, the ultrasonic bolt stress high-precision detection device comprises a bracket seat 4 and an ultrasonic detector 8 arranged in the bracket seat 4. The bracket seat 4 is a box structure with an opening at the top and the front, and a rubber pad 6 is installed on the bottom plate 5 of the bracket seat 4; a group of clamping rod assemblies that cooperate with each other to clamp the bolt test piece are arranged in the bracket seat 4; at the same time, a detection moving assembly 1 that drives the clamping rod assembly to rotate and synchronously drives the ultrasonic detector 8 to move horizontally is also arranged in the bracket seat 4.

[0020] When the ultrasonic bolt stress high-precision detection device is used, the bolt test piece is first placed between a set of clamping rod assemblies, and the two ends of the bolt test piece are clamped by the clamping rod assemblies to clamp and fix the bolt test piece. Then, the ultrasonic detector 8 is turned on to perform searchlight detection on the bolt test piece.

[0021] Manually rotate the detection moving component 1, thereby driving a group of bolt test pieces between the clamping rod components to rotate through the detection moving component 1; at the same time, drive the ultrasonic detector 8 to move horizontally, so that while the bolt test piece rotates, the ultrasonic detector 8 moves horizontally to complete uniform searchlight detection of all positions on the surface of the bolt test piece, which is convenient for rapid discovery of cracks on the bolt test piece, thereby effectively improving the comprehensiveness of crack detection on the bolt test piece, greatly reducing the situation where local omissions are easy to occur during manual crack detection, and having higher detection accuracy, and the detection operation and overall structure are relatively simple and easy to use.

[0022] A set of clamping rod assemblies in this embodiment adopts the following structure to clamp and fix the bolt test piece: like Figure 1 , Figure 2 and Figure 3 As shown, the clamping rod assembly on one side of the bracket seat 4 includes a connecting rod 102 that passes through a side wall of the bracket seat 4 and is transmission-connected to the bracket seat 4. The connecting rod 102 is transmission-connected to the detection moving assembly 1 at the rod body section outside the bracket seat 4, so as to cooperate with the detection moving assembly 1 to drive the clamping rod assembly and the ultrasonic detector 8 to move simultaneously. An electric hydraulic push rod 2 is installed at one end of the connecting rod 102 extending into the bracket seat 4, and a clamping rod a9 for clamping the bolt test piece is installed on the output end of the electric hydraulic push rod 2; the electric hydraulic push rod 2 can enable the clamping rod a9 to cooperate with another clamping rod assembly to clamp the bolt test piece, and can also apply a certain pressure value to the bolt test piece, so that the bolt test piece is searchlighted and detected under pressure.

[0023] Considering the installation of another clamping rod assembly, such as Figure 1 , Figure 3 and Figure 4 As shown, an outer sleeve 112 is rotatably mounted on the other side wall of the bracket seat 4 through a bearing. Figure 1 , Figure 2 and Figure 3 As shown, another clamping rod assembly includes a clamping rod b11 that slides through an outer sleeve 112 and can rotate relative to the bracket seat 4 through the outer sleeve 112. The clamping rod b11 is located at the same horizontal height as the clamping rod a9, and a baffle 12 is installed at the end of the clamping rod b11 located at the bracket seat 4; at the same time, considering the sliding limit problem of the clamping rod b11 under the premise of being able to rotate automatically, in this embodiment, a locking bolt 101 is threadedly connected to the tube wall of the outer sleeve 112, and the locking bolt 101 passes through the outer sleeve 112 and cooperates with the locking hole on the clamping rod b11 to achieve sliding limit of the clamping rod b11, and at the same time, the distance between the clamping rod b11 and the clamping rod a9 is adjusted to adapt to clamping and fixing bolt test pieces of different sizes.

[0024] The detection moving assembly 1 in this embodiment adopts the following structure to drive the clamping rod assembly to rotate and synchronously drive the ultrasonic detector 8 to move horizontally: like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the detection moving assembly 1 includes a screw rod 108 rotatably mounted in the bracket seat 4, a joint plate 103 mounted on the outer end of the connecting rod 102 on the bracket seat 4, and a gear assembly located between the screw rod 108 and the connecting rod 102. A screw nut 109 is threadedly connected to the screw rod 108, and one end of the screw rod 108 extends to the outside of one side of the bracket seat 4; the ultrasonic detector 8 and the battery 7 for powering it are fixed on the outer side of the screw nut 109, and the ultrasonic detector 8 is located above the clamping rod a9 and the clamping rod b11. Since the ultrasonic detector 8 needs to move horizontally to achieve uniform searchlight detection of all positions on the surface of the bolt test piece, in this embodiment, a guide block 111 is provided on the outer surface of the screw nut 109, and a guide groove 110 is provided on the inner wall of the bracket seat 4 to cooperate with the sliding of the guide block 111; the ultrasonic detector 8 is moved horizontally through the screw 108, the screw nut 109, the guide groove 110 and the guide block 111, so as to achieve uniform searchlight detection of all positions on the surface of the bolt test piece.

[0025] In addition, if Figure 1 As shown, a handle bar 104 is fixed on the side of the joint plate 103 away from the connecting rod 102, and a rubber sleeve 13 is sleeved on the surface of the handle bar 104. The handle bar 104 and the rubber sleeve 13 are provided to facilitate manual rotation of the joint plate 103, increase friction, and facilitate operation.

[0026] When the ultrasonic bolt stress high-precision detection device is used, pressure is applied to the bolt test piece through the output end of the electric hydraulic push rod 2; the joint plate 103103 is manually rotated, and the joint plate 103103 drives the clamping rod a9, the bolt test piece and the clamping rod b11 to rotate synchronously through the connecting rod 102; at the same time, the connecting rod 102 drives the screw rod 108 to rotate through the gear assembly, and the ultrasonic detector 8 is moved horizontally through the screw rod 108, the screw nut 109, the guide groove 110 and the guide block 111, so that when the bolt test piece rotates, the ultrasonic detector 8 moves it horizontally, completing uniform searchlight detection of all positions on the surface of the bolt test piece, facilitating the rapid discovery of cracks on the bolt test piece, thereby effectively improving the comprehensiveness of crack detection on the bolt test piece, greatly reducing the situation where local omissions are easy to occur when manually detecting cracks, and the detection accuracy is higher. The detection operation and overall structure are relatively simple and easy to use.

[0027] Further, as a preferred technical solution of this embodiment, Figure 1 , Figure 5 and Figure 6 As shown, the gear assembly in this embodiment includes a gear a105 installed on the connecting rod 102 located on the external rod body section of the bracket seat 4, a gear c107 installed on the screw rod 108 located at the external end of the bracket seat 4, and a gear b106 installed on the outer wall of one side of the bracket seat 4 through a shaft; the gear a105 and the gear c107 are located on both sides of the gear b106 and mesh with the gear b106; the outer diameters of the gear a105 and the gear b106 are equal, and the outer diameter of the gear c107 is 2-5 times the outer diameter of the gear b106. When the connecting rod 102 rotates, it drives the gear a105 to rotate, and the gear a105, gear b106 and gear c107 cooperate to drive the screw rod 108 to rotate; in this process, the outer diameter of the gear c107 is set to be larger than the outer diameter of the gear a105, so that the moving speed of the ultrasonic detector 8 is lower than the rotation speed of the bolt test piece, thereby ensuring that all positions on the bolt test piece can be illuminated by the ultrasonic detector 8 when it rotates, thereby ensuring the accuracy of the crack detection results.

[0028] Further, as a preferred technical solution of this embodiment, Figure 1 and Figure 4 As shown, the ends of the clamping rod b11 and the clamping rod a9 in this embodiment that are close to each other are set as tapered ends; at the same time, a silicone layer 10 is fixed on the side surfaces of the tapered ends of the clamping rod b11 and the clamping rod a9; the two ends of the bolt test piece can be point clamped by the set tapered ends, and the set silicone layer 10 effectively improves the stability of the clamping of the two ends of the bolt test piece.

[0029] Further, as a preferred technical solution of this embodiment, Figure 1 and Figure 2 As shown, in this embodiment, a support assembly 3 for auxiliary support of the bolt test piece is also arranged directly below the clamping rod b11 and the clamping rod a9 in the bracket seat 4; the support assembly 3 includes a support plate 301 arranged directly below the clamping rod b11 and the clamping rod a9, and a plurality of springs 302 are arranged at an equal distance at the bottom of the support plate 301. The bottom of the bolt test piece can be auxiliary supported by the support plate 301, and the spring 302 allows the support plate 301 to move up and down, and makes the top surface of the support plate 301 close to the bottom of the bolt test piece, thereby improving its stability during rotation.

[0030] In addition, if Figure 5 and Figure 6 As shown, a plurality of equally spaced ball bearings 303 are rollingly connected to the top side surface of the support plate 301; the plurality of ball bearings 303 are effectively arranged to reduce the friction force when the top surface of the support plate 301 and the bottom surface of the bolt test piece rotate relative to each other, and the rotation of the bolt test piece is not affected while being supported by the support plate 301.

[0031] Based on the structure of the above-mentioned ultrasonic bolt stress high-precision detection device, this embodiment also proposes an ultrasonic bolt stress detection method, which includes the following steps: S1. First, place the bolt test piece between the clamping rod a9 and the clamping rod b11, and drive the clamping rod a9 to move through the output end of the electric hydraulic push rod 2, so that the clamping rod a9 cooperates with the clamping rod b11 to clamp the two ends of the bolt test piece, thereby clamping and fixing the bolt test piece and applying pressure to the bolt test piece; S2. Turn on the ultrasonic detector 8, so as to detect the bolt test piece through the ultrasonic detector 8; manually rotate the joint plate 103, and the joint plate 103 drives the clamping rod a9, the bolt test piece and the clamping rod b11 to rotate synchronously through the connecting rod 102; at the same time, the connecting rod 102 drives the screw rod 108 to rotate through the gear assembly, and the ultrasonic detector 8 is moved horizontally through the screw rod 108, the screw nut 109, the guide groove 110 and the guide block 111; S3. The ultrasonic detector 8 fixed thereon is driven to move horizontally by the screw nut 109, so that the ultrasonic detector 8 moves horizontally while the bolt test piece rotates, thereby performing uniform searchlight detection on all positions on the surface of the bolt test piece; at the same time, since the outer diameter of the gear c107 is larger than the outer diameter of the gear a105, the moving speed of the ultrasonic detector 8 is lower than the rotation speed of the bolt test piece.

[0032] In addition, when the bolt test piece is clamped between the clamping rod a9 and the clamping rod b11, the bottom of the bolt test piece is auxiliary supported by the support plate 301; the spring 302 allows the support plate 301 to move up and down, and makes the top surface of the support plate 301 close to the bottom of the bolt test piece.

[0033] To sum up, the ultrasonic bolt stress high-precision detection device drives the clamping rod assembly and the bolt test piece clamped between a group of clamping rod assemblies to rotate through the detection moving assembly 1, and drives the ultrasonic detector 8 to move horizontally at the same time, so that while the bolt test piece rotates, the ultrasonic detector 8 moves it horizontally, completing uniform searchlight detection of all positions on the surface of the bolt test piece; it is convenient to quickly find cracks on the bolt test piece, thereby effectively improving the comprehensiveness of crack detection on the bolt test piece, greatly reducing the situation where local omissions are easy to occur during manual crack detection, and the detection accuracy is higher, and the detection operation and overall structure are relatively simple and easy to use.

[0034] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the same elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An ultrasonic bolt stress high-precision detection device, characterized in that: The ultrasonic bolt stress high-precision detection device includes a bracket seat and an ultrasonic detector arranged in the bracket seat; the bracket seat is a box structure with openings on the top and the front, and is provided with a group of clamping rod assemblies that cooperate with each other to clamp the bolt test piece; the bracket seat is also provided with a detection moving assembly that drives the clamping rod assembly to rotate and synchronously drives the ultrasonic detector to move horizontally; through the detection moving assembly, the clamping rod assembly drives the bolt test piece to rotate in the bracket seat, while the ultrasonic detector moves horizontally to uniformly detect all positions on the surface of the bolt test piece.

2. The ultrasonic bolt stress high-precision detection device according to claim 1 is characterized in that: The clamping rod assembly on one side of the bracket seat includes a connecting rod passing through a side wall of the bracket seat and being transmission-connected to the bracket seat; the rod body section of the connecting rod on the outside of the bracket seat is transmission-connected to the detection moving assembly; an electric hydraulic push rod is installed at one end of the connecting rod extending into the bracket seat, and a clamping rod a for clamping the bolt test piece is installed on the output end of the electric hydraulic push rod.

3. The ultrasonic bolt stress high-precision detection device according to claim 2 is characterized in that: An outer sleeve is rotatably mounted on the side wall of the other side of the bracket seat; the other clamping rod assembly includes a clamping rod b that slides through the outer sleeve and can rotate relative to the bracket seat through the outer sleeve, and the clamping rod b is at the same horizontal height as the clamping rod a; a locking bolt is threadedly connected on the tube wall of the outer sleeve, and the locking bolt can pass through the outer sleeve and cooperate with the locking hole on the clamping rod b to limit the sliding of the clamping rod b.

4. The ultrasonic bolt stress high-precision detection device according to claim 3 is characterized in that: The detection moving component includes a screw rod rotatably installed in the bracket seat, a screw nut is threadedly connected to the screw rod, and one end of the screw rod extends to the outside of one side of the bracket seat; a guide block is provided on the outer side surface of the screw nut, and a guide groove for sliding with the guide block is provided on the inner wall of the bracket seat; the ultrasonic detector is fixed on the outer side surface of the screw nut, and the ultrasonic detector is located above the clamping rod a and the clamping rod b; the detection moving component also includes a joint plate installed at the outer end of the connecting rod on the bracket seat, and a gear assembly located between the screw rod and the connecting rod for transmission connection.

5. The ultrasonic bolt stress high-precision detection device according to claim 4 is characterized in that: The gear assembly includes a gear a installed on the rod body section of the connecting rod located outside the bracket seat, a gear c installed on the screw rod located at the end of the bracket seat, and a gear b installed on the outer wall of one side of the bracket seat through a shaft; gear a and gear c are located on both sides of gear b and mesh with gear b; the outer diameters of gear a and gear b are equal, and the outer diameter of gear c is 2-5 times the outer diameter of gear b.

6. The ultrasonic bolt stress high-precision detection device according to claim 4 is characterized in that: A handle bar is fixed on the side of the joint plate away from the connecting rod, and a rubber sleeve is sleeved on the surface of the handle bar.

7. The ultrasonic bolt stress high-precision detection device according to claim 3 is characterized in that: The ends of the clamping rod b and the clamping rod a that are close to each other are tapered ends, and silicone layers are fixedly installed on the side surfaces of the tapered ends of the clamping rod b and the clamping rod a.

8. The ultrasonic bolt stress high-precision detection device according to claim 3 is characterized in that: A support assembly for auxiliary support of the bolt test piece is also arranged directly below the clamping rod b and the clamping rod a in the bracket seat; the support assembly includes a support plate arranged directly below the clamping rod b and the clamping rod a, and a plurality of springs distributed equidistantly are arranged at the bottom of the support plate.

9. The ultrasonic bolt stress high-precision detection device according to claim 8, characterized in that: A plurality of equally spaced balls are mounted on the top surface of the support plate.

10. An ultrasonic bolt stress detection method, the ultrasonic bolt stress detection method is based on the ultrasonic bolt stress high-precision detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. First, place the bolt test piece between the clamping rod a and the clamping rod b, and drive the clamping rod a to move through the output end of the electric hydraulic push rod, so that the clamping rod a cooperates with the clamping rod b to clamp the two ends of the bolt test piece, thereby clamping and fixing the bolt test piece and applying pressure to the bolt test piece at the same time; S2. Turn on the ultrasonic detector, so as to detect the bolt test piece through the ultrasonic detector; manually rotate the joint plate, and the joint plate drives the clamping rod a, the bolt test piece and the clamping rod b to rotate synchronously through the connecting rod; at the same time, the connecting rod drives the screw rod to rotate through the gear assembly, and the ultrasonic detector is moved horizontally through the screw rod, the screw rod nut, the guide groove and the guide block; S3. The ultrasonic detector fixed on the screw nut is driven to move horizontally, so that the ultrasonic detector moves horizontally while the bolt test piece rotates, thereby performing uniform searchlight detection on all positions on the surface of the bolt test piece; at the same time, since the outer diameter of gear c is larger than the outer diameter of gear a, the moving speed of the ultrasonic detector is lower than the rotation speed of the bolt test piece.

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