A tool for ultrasonic testing of a bolt

Abstract

The utility model provides a kind of bolt ultrasonic detection tool, belong to nondestructive testing technical field.Bolt ultrasonic detection tool includes fixed device in the same axis fixed in bolt exterior when using, probe driving device for being installed on fixed device to drive probe rotation and the probe clamping device being connected on probe driving device, fixed device includes the extension part extending out bolt end face, probe clamping device is located in extension part inside, extension part end portion is equipped with end plate, probe driving device includes the driving motor being fixed on end plate, the output shaft of driving motor is coaxial and penetrates the center of end plate and extends into extension part inside and is connected with the probe clamping device, the structure of gear and gear ring cooperation drive rotation is saved, the output shaft of driving motor can directly drive probe clamping device rotation, structure is simpler, solve the problem of complex structure, high machining precision requirement, great manufacturing difficulty caused by gear and gear ring drive rotation.

Description

Technical Field

[0001] This utility model relates to a tooling for ultrasonic testing of bolts, belonging to the field of non-destructive testing technology. Background Technology

[0002] Bolts are widely used as key connecting components in various mechanical equipment and building structures. The quality of bolts is directly related to the safety and reliability of the overall structure. However, due to factors such as manufacturing process and service environment, bolts are prone to internal defects such as cracks, inclusions, and porosity, which are difficult to detect with traditional testing methods.

[0003] Ultrasonic sensing technology is a high-precision, non-destructive testing technique. Phased array ultrasonic testing can intuitively, efficiently, and accurately identify the service condition of bolts and guide the precise maintenance of problematic bolts, thereby improving their safe and reliable service life and ultimately ensuring the safe and reliable operation of the overall structure. Currently, for small bolts, the ultrasonic probe can be placed on the bolt end face to completely scan the entire bolt interior without the need for probe movement or rotation. However, for large bolts, the ultrasonic probe needs to be rotated around the bolt axis to ensure that the entire bolt is inspected. Manual operation, however, cannot precisely center the probe on the bolt end face, resulting in complex ultrasonic signal reflections caused by the bolt structure, interfering with defect identification. Furthermore, once a defect is detected, the test results are difficult to reproduce, and there are also issues such as low efficiency, missed detections, and false detections.

[0004] To address the aforementioned issues, Chinese utility model patent CN209117632U discloses a scanning device for ultrasonic testing of bolts. This scanning device includes a fixing device, a circular track, a probe driving device, and a probe clamping device. The fixing device comprises a circular base and a support arm. The circular base is fitted over the bolt, and multiple locking screws arranged at circumferential intervals tighten the outer surface of the bolt, thus fixing the scanning device to the bolt. The circular track is fixed to the upper end of the support arm, with a gear ring at the top and the circular base at the bottom. The probe driving device is mounted on the circular track and includes a motor and gears. The gears mesh with the gear ring, driving the probe driving device to move along the circular track. The probe clamping device is mounted on the probe driving device and includes a U-shaped support arm. Each of the two main arms of the U-shaped support arm has a tightening screw, and the end of each tightening screw has a rubber pad. Rotating the tightening screws on both main arms clamps the ultrasonic probe.

[0005] The aforementioned scanning device enables automatic rotation of the ultrasonic probe, improving the reliability and repeatability of the detection, and enhancing detection accuracy compared to manual inspection. However, the structure is relatively complex due to the need for the meshing of the gear ring and gears to ensure that the rotation axis of the probe clamping device is coaxial with the bolt, and the high precision requirements for the machining of the gear ring and gears increase the manufacturing difficulty. Utility Model Content

[0006] The purpose of this invention is to provide a tooling for ultrasonic testing of bolts, so as to solve the problems of complex structure, high processing accuracy requirements and high manufacturing difficulty caused by the use of gears and gear rings to drive the probe clamping device to rotate in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A fixture for ultrasonic testing of bolts includes a fixing device coaxially fixed to the outside of the bolt during use, a probe driving device mounted on the fixing device for driving a probe to rotate around the bolt axis, and a probe clamping device connected to the probe driving device for holding the probe. The fixing device includes an extension portion that extends beyond the bolt end face during use. The probe clamping device is located inside the extension portion. The end of the extension portion is provided with an end plate that is parallel to the bolt end face during use. The probe driving device includes a drive motor fixed on the end plate. The output shaft of the drive motor coaxially passes through the center of the end plate and extends into the extension portion and is connected to the probe clamping device.

[0008] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, which further defines the fixing device, the probe driving device, and the probe clamping device. Specifically, the fixing device includes an extension portion that extends beyond the bolt end face during use. The probe clamping device is located inside the extension portion. The end of the extension portion is provided with an end plate that is parallel to the bolt end face during use. The probe driving device includes a drive motor fixed on the end plate. The output shaft of the drive motor coaxially passes through the center of the end plate and extends into the extension portion to connect with the probe clamping device. This eliminates the need for a gear and gear ring to drive the rotation. The output shaft of the drive motor can directly drive the probe clamping device to rotate, making the structure simpler and solving the problems of complex structure, high processing accuracy requirements, and high manufacturing difficulty caused by using gears and gear rings to drive rotation.

[0009] Furthermore, the output shaft of the drive motor is connected to a coaxial circular chuck, and the inner wall of the outer extension is provided with a circumferential slide rail that guides and cooperates with the edge of the circular chuck in the circumferential direction. The probe clamping device is connected to the side of the circular chuck facing away from the drive motor.

[0010] Furthermore, the probe clamping device includes a linear slide rail, a slider mounted on the linear slide rail, and an adjustment and locking mechanism for changing and locking the position of the slider. The guiding direction of the linear slide rail is in the same direction as the axial direction of the output shaft. Two clamping claws are spaced apart at the end of the slider, and clamping screws for clamping the probe from both sides are installed on the two clamping claws.

[0011] Furthermore, the adjustment and locking mechanism includes an adjustment motor mounted on the slider and a gear that is directly or indirectly driven to rotate by the adjustment motor, and a rack that meshes with the gear is provided on the linear slide rail.

[0012] Furthermore, the linear guide rail, slider, or adjusting motor is fixed with a power source for providing electrical energy to the adjusting motor.

[0013] Furthermore, the U-shaped slot formed by the two gripping claws and the slider is arranged facing the bolt end face.

[0014] Furthermore, a bearing is installed between the central hole in the end plate and the output shaft of the drive motor.

[0015] Furthermore, the fixing device includes a fixing cylinder, the inner wall of which is provided with internal threads for direct connection with the end of the bolt.

[0016] Furthermore, the fixing device includes a fixing cylinder, a part of which constitutes the extended portion, and an observation window is provided on the fixing cylinder at a position corresponding to the circular chuck and the probe clamping device.

[0017] Furthermore, the output shaft of the drive motor is fixedly connected to the center of the circular chuck, or the output shaft of the drive motor is coaxially connected to a rotating shaft, which is fixedly connected to the center of the circular chuck. Attached Figure Description

[0018] Figure 1 This is a perspective view of Embodiment 1 of the tooling for ultrasonic testing of bolts according to this utility model; Figure 2 This is a perspective view of the tooling for ultrasonic testing of bolts according to Embodiment 1 of this utility model after removing the connecting cylinder; Figure 3 This is a perspective view of the mounting cylinder in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 4 This is a perspective view of the probe driving device and probe clamping device in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 5 This is a perspective view of the probe clamping device in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 6 This is a front view of the probe clamping device in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 7 This is a schematic diagram of the driving principle of the probe clamping device in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 8 This is a perspective view of the connecting cylinder in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 9 This is an exploded view of the connecting cylinder and the protective cover in Embodiment 1 of the tooling for ultrasonic testing of bolts of this utility model; Figure 10 This is a perspective view of embodiment 2 of the tooling for ultrasonic testing of bolts according to this utility model; Figure 11 This is a perspective view of the connecting cylinder in Embodiment 2 of the tooling for ultrasonic testing of bolts according to this utility model.

[0019] In the diagram: 1. Fixing device; 11. Connecting cylinder; 111. Small diameter cylinder; 1111. Internal thread; 1112. Slot; 112. Large diameter cylinder; 12. Mounting cylinder; 121. End plate; 1211. Center hole; 122. Observation window; 123. Claw; 124. Circumferential slide rail; 2. Probe driving device; 21. Drive motor; 22. Control system; 23. Rotating shaft; 24. Circular chuck; 25. Bearing; 3. Probe clamping device; 31 311 Linear guide rail; 32 Rack; 33 Slider; 34 Clamping claw; 35 Adjustment and locking mechanism; 360 Drive gear; 371 First gear; 382 Second gear; 392 First sprocket; 303 First chain; 304 First chain; 315 Second chain; 326 Second chain; 337 First transmission gear; 348 Idler gear; 349 Second transmission gear; 340 Power supply; 35 Probe; 46 Protective cover; 57 Spring claw; 68 Bolt. Detailed Implementation

[0020] To address the technical problems existing in the prior art, the basic concept of this utility model is to change the structural form of the fixing device and the probe driving device, as well as the arrangement position of the probe clamping device. The fixing device includes an extension portion that extends beyond the bolt end face, and the probe clamping device is located inside the extension portion. The drive motor is directly fixed to the end plate at the end of the extension portion, and the output shaft of the drive motor directly coaxially passes through the center of the end plate and extends into the extension portion to connect with the probe clamping device, thereby directly driving the probe clamping device to rotate. This eliminates the need for the gear ring and gear matching structure, making the structure simpler.

[0021] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0022] The implementation method of the tooling for ultrasonic testing of bolts in this utility model is as follows: Combination Figure 1 and Figure 2As shown, the fixture for ultrasonic testing of bolts includes a fixing device 1 that is coaxially fixed to the outside of the bolt 6 during use, a probe driving device 2 mounted on the fixing device 1 for driving the probe 4 to rotate around the axis of the bolt 6, and a probe clamping device 3 connected to the probe driving device 2 for clamping the probe 4.

[0023] Bolt 6 is a bolt in service, meaning it is in a state where it is engaged with a nut (not shown in the figure) to fix two or more components together, with the end of the bolt shank and the nut both exposed. Probe 4 is the probe of the phased array detector, used for online inspection of the end face of bolt 6 to identify its service status. Due to the large size of bolt 4, probe 4 needs to rotate around the axis of bolt 6 to ensure that the entire bolt is inspected.

[0024] In this embodiment, the fixing device 1 is cylindrical, meaning it is a fixing cylinder, and the fixing cylinder is divided into two sections: a connecting cylinder 11 and a mounting cylinder 12. The connecting cylinder 11 is responsible for direct connection with the bolt 6, thus combining... Figure 8 As shown, an internal thread 1111 is provided on the inner wall of the connecting cylinder 11 to directly connect with the end of the bolt 6. Through this direct connection, the fixing device 1 can be easily fixed to the outside of the bolt 6 and coaxial with the bolt 6. Compared with the prior art, which tightens the bolt by controlling the extension length of multiple set screws, the fixing method of this utility model is simpler to operate and more accurate.

[0025] The mounting cylinder 12 is responsible for mounting the probe drive device 2 and the probe clamping device 3. The mounting cylinder 12 and the connecting cylinder 11 are connected by a snap-fit. The two cylinders are detachable. Therefore, when installing the entire fixture onto the end of the bolt 6, the connecting cylinder 11 can be assembled onto the end of the bolt 6 first. After the connecting cylinder 11 is assembled, the mounting cylinder 12 with the probe drive device 2 and the probe clamping device 3 can be snapped onto the connecting cylinder 11. The structure of the connecting cylinder 11 is simpler, lighter, and easier to install.

[0026] Furthermore, after the inspection is completed, the mounting cylinder 12 and the connecting cylinder 11 can be disconnected, allowing the mounting cylinder 12, the probe drive device 2, and the probe clamping device 3 to be removed, while the connecting cylinder 11 remains at the end of the bolt 6. This way, for bolts that require periodic monitoring, it is not necessary to reinstall the connecting cylinder 11 for the next inspection; the mounting cylinder 12 can be directly snapped into the connecting cylinder 11, making the operation more convenient.

[0027] Meanwhile, the remaining connecting sleeve 11 also provides protection for the end of the bolt 6. The connecting sleeve 11 is preferably made of a non-metallic material, such as nylon or PEEK. Of course, in this embodiment, to improve the protective effect, such as... Figure 9As shown, the tooling for ultrasonic testing of bolts also includes a cover 5 for installation at the end of the connecting cylinder 11 after the mounting cylinder 12 is removed, thereby sealing the port of the connecting cylinder 11 and providing effective protection for the external thread at the end of the bolt 6 and the end face of the bolt 6.

[0028] Of course, to facilitate future testing and without adding additional connecting structures, the cover 5 and the connecting cylinder 11 are connected by a snap-fit ​​mechanism, thus making full use of the snap-fit ​​structure of the connecting cylinder 11 itself. Specifically, as... Figure 8 and Figure 9 As shown, the end of the connecting cylinder 11 is provided with a plurality of slots 1112 spaced circumferentially, and the cover 5 is provided with spring claws 51 corresponding to the slots 1112. Figure 2 and Figure 3 As shown, the end of the mounting cylinder 12 is provided with a claw 123 corresponding to the slot 1112. In other embodiments, a claw may also be provided at the end of the connecting cylinder 11, while slots may be provided at the end of the mounting cylinder 12 and on the cover 5.

[0029] Furthermore, such as Figure 8 and Figure 9 As shown, the connecting cylinder 11 in this embodiment is not a uniform diameter cylinder. The connecting cylinder 11 includes a small diameter cylinder 111 and a large diameter cylinder 112. The internal thread 1111 and the groove 1112 are both provided on the small diameter cylinder 111. The inner diameter of the large diameter cylinder 112 is larger than the diameter of the circumscribed circle of the nut, so the nut can enter the large diameter cylinder 112 to protect the nut.

[0030] In other embodiments, such as Figure 10 and Figure 11 As shown, in this embodiment, the connecting cylinder 11 is an equal-diameter cylinder with a uniform outer diameter, which is equivalent to only including the small-diameter cylinder. At this time, the connecting cylinder 11 can only cover the end of the bolt. With the protective cover, it only protects the end of the bolt and does not protect the nut.

[0031] In this embodiment, combined with Figure 1 and Figure 2 As shown, probe 4 is located outside mounting cylinder 12. Since probe 4 is in contact with the end face of bolt 6, and the end face of mounting cylinder 12 is in contact with the end face of connecting cylinder 11, the end face of bolt 6 is located inside connecting cylinder 11. Simultaneously, the end of connecting cylinder 11 extends beyond the bolt end face. Of course, the entire mounting cylinder 12 is also located outside the bolt end face. Compared to existing technologies where the end of the fixing device is basically flush with the bolt end face, the fixing device 1 in this invention is equivalent to having an extended portion extending beyond the bolt end face. Furthermore, both connecting cylinder 11 and mounting cylinder 12 are fixing cylinders, meaning a portion of the fixing cylinder constitutes the extended portion.

[0032] In this utility model, the probe clamping device 3 is located inside the outer extension portion, specifically, a portion is located inside the mounting cylinder 12 and the remaining portion is located inside the connecting cylinder 11. Of course, in other embodiments, if the connecting cylinder 11 and the mounting cylinder 12 are an integral fixed cylinder, then the probe clamping device 3 is located inside the outer extension portion of the integral fixed cylinder.

[0033] The mounting cylinder 12 in this embodiment is made of lightweight alloy material, possessing lightweight and corrosion-resistant properties. Combined with... Figure 2 , Figure 3 and Figure 4 As shown, the end of the mounting cylinder 12 (i.e. the end of the extended portion) is provided with an end plate 121 that is parallel to the end face of the bolt 6 during use. The probe driving device 2 includes a drive motor 21 fixed on the end plate 121. The output shaft of the drive motor 21 coaxially passes through the center of the end plate 121 and extends into the interior of the mounting cylinder 12 to connect with the probe clamping device 3. In this way, the output shaft of the drive motor 21 can directly drive the probe clamping device 3 to rotate, eliminating the structure of gear and gear ring drive rotation in the prior art. The structure is simpler and solves the problems of complex structure, high processing accuracy requirements and high manufacturing difficulty caused by using gear and gear ring drive rotation.

[0034] In this embodiment, the drive motor 21 is a stepper motor, and the drive motor 21 is equipped with a control system 22 for controlling the speed and angle of the output shaft, thereby controlling the speed and angle of the probe clamping device 3. The drive motor 21 can also be equipped with a portable power supply for convenient outdoor use. In other embodiments, the drive motor 21 can also be a servo motor.

[0035] Furthermore, the probe driving device 2 also includes a circular chuck 24 arranged coaxially with the output shaft of the drive motor 21. Depending on the length of the output shaft of the drive motor 21, when the output shaft is short, the output shaft can be coaxially connected to the rotating shaft 23 (the output shaft of the drive motor 21 and the coupling between the output shaft and the rotating shaft 23 are not separately marked in the attached figures), and the rotating shaft 23 is fixedly connected to the center of the circular chuck 24; when the output shaft is long enough, the output shaft can be directly fixedly connected to the center of the circular chuck 24, so that the output shaft of the drive motor 21 drives the circular chuck 24 to rotate. Figure 1 , Figure 2 , Figure 4 The rotating shaft 23 is the output shaft of the drive motor 21.

[0036] The inner wall of the mounting cylinder 12 is provided with a circumferential slide rail 124 that guides and engages with the edge of the circular chuck 24 in the circumferential direction. Specifically, the circumferential slide rail 124 is an annular groove, into which the edge of the circular chuck 24 is engaged. In other embodiments, an annular groove can also be provided on the edge of the circular chuck 24, into which the circumferential slide rail 124 is engaged. Of course, for ease of assembly, the circular chuck 24 can be made of a slightly deformable material for forced engagement. Alternatively, the mounting cylinder 12 can be designed as a two-part structure, with the circumferential slide rail 124 and the circular chuck 24 assembled by interlocking the two sides.

[0037] The circumferential slide rail 124 is located in the middle of the height direction of the mounting cylinder 12. The circular chuck 24 and the circumferential slide rail 124 are guided and engaged in the circumferential direction, which can ensure the rotational stability of the rotating shaft 23, constrain the rotational trajectory, and prevent the probe clamping device 3 from causing the rotating shaft 23 to deflect and become out of center.

[0038] Meanwhile, a bearing 25 is installed between the central hole 1211 at the center of the end plate 121 and the output shaft of the drive motor 21 to ensure that the probe clamping device 3 rotates smoothly and that the axis of rotation is collinear with the axis of the bolt 6. In other embodiments, the bearing 25 may not be provided, and the rotational accuracy may be ensured solely by the circular chuck 24 and the circumferential slide rail 124; of course, the circular chuck 24 and the circumferential slide rail 124 may not be provided, and the rotational accuracy may be ensured solely by the bearing 25; of course, neither the circular chuck 24 and the circumferential slide rail 124 nor the bearing 25 may be provided, and the rotational accuracy of the probe clamping device 3 may be ensured solely by the rotational accuracy of the drive motor 21 itself.

[0039] Combination Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the probe clamping device 3 is connected to the side of the circular chuck 24 facing away from the drive motor 21. The probe clamping device 3 includes a linear slide rail 31, a slider 32 guided and mounted on the linear slide rail 31, and an adjustment and locking mechanism 34 for changing and locking the position of the slider 32. The guiding direction of the linear slide rail 31 is in the same direction as the axis of the output shaft of the drive motor 21. By adjusting the locking mechanism 34, the probe 4 can be brought close to and pressed against the bolt end face for inspection of the bolt end face.

[0040] Two clamping claws 33 are spaced apart at the end of the slider 32. Each clamping claw 33 has a threaded hole for mounting a tightening screw. The tightening screws on both sides tighten the probe 4, thus fixing the probe 4 to the probe clamping device 3. Furthermore, the U-shaped groove formed by the two clamping claws 33 and the slider 32 is oriented towards the bolt end face, meaning the groove is perpendicular to the bolt end face. This allows the fixed position of the probe 4 to be adjusted radially on the bolt, ensuring the probe 4 covers the appropriate position on the bolt end face. Alternatively, for large bolts, the entire bolt end face can be inspected by repeatedly adjusting the position of the probe 4.

[0041] In this embodiment, combined with Figure 5 , Figure 6 and Figure 7 As shown, the adjustment locking mechanism 34 includes an adjustment motor (not shown) mounted on the slider 32 and a gear that is directly or indirectly driven to rotate by the adjustment motor. The linear slide rail 31 is provided with a rack 311 that meshes with the gear, so that the slider 32 is driven to move along the linear slide rail 31 through the gear and rack mechanism.

[0042] Specifically, in this embodiment, racks 311 are respectively provided on both sides of the linear slide rail 31. The racks include two first gears 341 meshing with one rack 311 and two second gears 342 meshing with the other rack 311. The two first gears 341 and the two second gears 342 rotate synchronously but in opposite directions to achieve the movement of the slider 32 along the linear slide rail 31. Since both sides are equipped with racks and pinions, the movement is more stable. It should be noted that... Figure 2 and Figure 4 Gears and racks are not shown in the drawing; this is a simplified representation.

[0043] Specifically, such as Figure 7 As shown, first sprockets 343 are mounted on the first shafts where the two first gears 341 are located, and first chains 344 are mounted on the two first sprockets 343. Second sprockets 345 are mounted on the second shafts where the two second gears 342 are located, and second chains 346 are mounted on the two second sprockets 345. A first transmission gear 347 is also mounted on one of the first shafts, and a second transmission gear 349 is also mounted on one of the second shafts. A drive gear 340 is mounted on the output end of the regulating motor. The drive gear 340 meshes with the second transmission gear 349 to drive the second transmission gear 349 to rotate, thereby causing the two second sprockets 345 to rotate synchronously through the second chains 346. Ultimately, the two second gears 342 rotate synchronously in the same direction, but in the opposite direction to the drive gear 340.

[0044] An idler gear 348 is provided between the drive gear 340 and the first transmission gear 347. The idler gear 348 meshes with both the drive gear 340 and the first transmission gear 347, acting as an intermediate transition to drive the first transmission gear 347 to rotate, and ensuring that the direction of rotation of the first transmission gear 347 is the same as that of the drive gear 340. When the first transmission gear 347 rotates, it causes the two first sprockets 343 to rotate synchronously via the first chain 344, ultimately achieving synchronous rotation of the two first gears 341 in the same direction, with the direction of rotation being the same as that of the drive gear 340.

[0045] In use, the drive gear 340 is rotated by adjusting the motor, so that the first gear 341 and the second gear 342 on both sides rotate synchronously in opposite directions, thereby controlling the movement of the slider 32. This allows the probe 4 to approach and press against the end face of the bolt during detection, and to move away from the end face of the bolt after detection. In other embodiments, two adjusting motors can be configured, one of which directly drives the first shaft to rotate, and the other directly drives the second shaft to rotate, thus eliminating the need for the drive gear 340, the first transmission gear 347, the idler gear 348, and the second transmission gear 349. Of course, if two adjusting motors can be configured, only one first gear 341 and one second gear 342 can be set, with one adjusting motor directly driving the first gear 341 to rotate and the other adjusting motor directly driving the second gear 342 to rotate, thus eliminating the need for the first sprocket 343, the first chain 344, the second sprocket 345, and the second chain 346. In other embodiments, only one first gear 341 or only one second gear 342 can be set, in which case only one adjusting motor is configured to directly drive the gear to rotate.

[0046] To control the pressure of probe 4 against the bolt end face, avoiding insufficient pressure that could affect the test results and excessive pressure that could damage probe 4, a pressure sensor chip can be installed at the end of probe 4. The adjusting locking mechanism 34 has a built-in control unit. Simultaneously with probe 4 contacting the bolt end face, the pressure sensor chip also contacts the bolt end face, continuously monitoring the contact pressure and feeding it back to the control unit. When the contact pressure reaches the preset pressure value of the control unit, the adjusting motor stops working, fixing the position of probe 4 and maintaining the preset pressure between probe 4 and the bolt end face. Alternatively, besides using a pressure sensor chip, the adjusting motor can also have a built-in torque detection module, directly detecting the torque of the output shaft. When probe 4 contacts the bolt end face, the torque of the adjusting motor's output shaft increases. When it increases to a preset value, the output shaft stops rotating, similarly controlling the pressure between probe 4 and the bolt end face within a suitable range.

[0047] Furthermore, since the probe clamping device 3 rotates during use, to prevent the wires connected to the adjusting motor from getting tangled or even breaking, a power supply 35 for providing power to the adjusting motor is fixed on the linear slide rail 31. The wire between the power supply 35 and the adjusting motor is very short, and the two rotate synchronously, so there will be no wire tangling. In other embodiments, the power supply 35 can also be fixed on the slider or the adjusting motor. Of course, in other embodiments, the adjusting motor can also be connected to an external power source via a wire. In this case, sufficient wire length should be reserved, and the probe clamping device 3 should be rotated clockwise at a certain angle and then counterclockwise at a certain angle to avoid wire tangling.

[0048] In addition, such as Figure 2 and Figure 3 As shown, observation windows 122 are provided on the wall of the mounting cylinder 12 at positions corresponding to the circular chuck 24 and the probe clamping device 3, allowing observation of the internal conditions. If any abnormality occurs, the detection can be stopped immediately. There are four observation windows 122 in total, arranged in pairs, symmetrically between the pairs. The two observation windows 122 in each pair are symmetrically arranged with the circumferential slide rail 124 as the boundary. Of course, in other embodiments, only one set of observation windows, one observation window, or no observation windows may be provided.

[0049] When using the ultrasonic testing fixture for bolts of this utility model, firstly, select a suitable connecting sleeve 11 according to the specifications of the bolt to be tested, install the connecting sleeve 11 onto the end of the bolt, apply coupling agent to the bolt end face, and assemble the remaining fixture components together. The clamps 123 on the mounting sleeve 12 engage with the grooves 1112 at the end of the connecting sleeve 11. Then, adjust the locking mechanism 34 to control the slider 32 to move towards the bolt end face, so that the probe 4 presses against the bolt end face with a predetermined pressure. Then, drive the motor 21 to control the probe clamping device 3 to rotate. Every 45° of rotation, the test results are stored (in the control system 22), ensuring that all parts of the bolt end face are detected. During the process, observe the internal situation through the observation window 122. If any abnormality occurs, stop the test immediately. After the test, remove the mounting sleeve 12. If protection is required, the connecting sleeve 11 remains at the bolt end, and a protective cover 5 is installed to protect the bolt end and nut. For the next test, simply remove the protective cover 5 to reconnect the connecting sleeve 11 to the mounting sleeve 12. Of course, if no protection is needed after the test is completed, the connecting sleeve 11 can be removed and reinstalled during the next test.

[0050] In other embodiments of the fixture for ultrasonic testing of bolts: the fixing method between the fixing device and the bolt may not be a direct threaded connection, but rather, as in the prior art, multiple tightening screws are used to tighten the outer circumferential surface of the bolt together.

[0051] In other embodiments of the fixture for ultrasonic testing of bolts: the fixing device may not be a cylindrical structure, but rather, as in the prior art, includes two fixing rings and multiple support arms fixed between the two fixing rings.

[0052] In other embodiments of the fixture for ultrasonic testing of bolts: the opening of the U-shaped groove formed by the two clamping claws and the slider may not be directly opposite the bolt end face. As with the prior art, the opening is parallel to the bolt end face.

[0053] In other embodiments of the fixture for ultrasonic testing of bolts: the adjusting locking mechanism is not an adjusting motor and gear rack mechanism, but as in the prior art, a tightening screw is installed on the slider. When the tightening screw is loosened, the slider can move, and when the tightening screw is tightened, it can press against the linear slide rail to lock the position of the slider.

[0054] In other embodiments of the fixture for ultrasonic testing of bolts: the guiding direction of the linear slide rail can also be the radial direction of the bolt. In this case, the locking mechanism is adjusted to adjust the radial position of the probe on the bolt end face. As for the movement of the probe closer to and away from the bolt end face, it can be achieved by the threaded connection between the fixed cylinder and the bolt. The probe can be moved closer to or away from the bolt end face by rotating the fixed cylinder.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A fixture for ultrasonic testing of bolts, comprising a fixing device coaxially fixed to the outside of the bolt during use, a probe driving device mounted on the fixing device for driving a probe to rotate around the bolt axis, and a probe clamping device connected to the probe driving device for clamping the probe, characterized in that, The fixing device includes an extension portion that extends beyond the bolt end face during use. The probe clamping device is located inside the extension portion. The end of the extension portion is provided with an end plate that is parallel to the bolt end face during use. The probe driving device includes a drive motor fixed on the end plate. The output shaft of the drive motor coaxially passes through the center of the end plate and extends into the extension portion to connect with the probe clamping device.

2. The fixture for ultrasonic testing of bolts according to claim 1, characterized in that, The output shaft of the drive motor is connected to a coaxial circular chuck. The inner wall of the outer extension is provided with a circumferential slide rail that guides and cooperates with the edge of the circular chuck in the circumferential direction. The probe clamping device is connected to the side of the circular chuck facing away from the drive motor.

3. The fixture for ultrasonic testing of bolts according to claim 1 or 2, characterized in that the probe... The clamping device includes a linear slide rail, a slider mounted on the linear slide rail, and an adjustment and locking mechanism for changing and locking the position of the slider. The guiding direction of the linear slide rail is in the same direction as the axis of the output shaft. Two clamping claws are spaced apart at the end of the slider, and clamping screws for clamping the probe from both sides are installed on the two clamping claws.

4. The fixture for ultrasonic testing of bolts according to claim 3, characterized in that, The adjustment and locking mechanism includes an adjustment motor mounted on the slider and a gear that is directly or indirectly driven to rotate by the adjustment motor. A rack that meshes with the gear is provided on the linear slide rail.

5. The fixture for ultrasonic testing of bolts according to claim 4, characterized in that, The linear guide, slider, or adjusting motor is equipped with a power source for providing electrical power to the adjusting motor.

6. The fixture for ultrasonic testing of bolts according to claim 3, characterized in that, The U-shaped slot formed by the two gripping claws and the slider is arranged facing the bolt end face.

7. The fixture for ultrasonic testing of bolts according to claim 1 or 2, characterized in that, A bearing is installed between the center hole of the end plate and the output shaft of the drive motor.

8. The fixture for ultrasonic testing of bolts according to claim 1 or 2, characterized in that, The fixing device includes a fixing cylinder, the inner wall of which is provided with internal threads for direct connection with the end of the bolt.

9. The fixture for ultrasonic testing of bolts according to claim 2, characterized in that, The fixing device includes a fixing cylinder, a part of which constitutes the extension portion. An observation window is provided on the fixing cylinder at a position corresponding to the circular chuck and the probe clamping device.

10. The fixture for ultrasonic testing of bolts according to claim 2, characterized in that, The output shaft of the drive motor is fixedly connected to the center of the circular chuck, or the output shaft of the drive motor is coaxially connected to a rotating shaft, which is fixedly connected to the center of the circular chuck.

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