A bolt ultrasonic detection tool and bolt end protection connecting device

Abstract

The utility model provides a kind of bolt ultrasonic testing tool and bolt end protection connecting device, belong to nondestructive testing technical field.Bolt ultrasonic testing tool includes fixed device, fixed device includes connecting barrel and installation barrel, installation barrel is used to install probe clamping rotating device, connecting barrel is equipped with with bolt end connection internal thread and with installation barrel coaxial and can dismantle connection connecting structure, connecting barrel is equipped with the cover of plugging the barrel mouth of connecting barrel, connecting barrel is equipped with for with the cover can dismantle connection connecting structure.The utility model in the directly threaded connection of connecting barrel in bolt end, without adjusting can guarantee with bolt coaxial, can improve detection efficiency;Installation barrel is coaxial with connecting barrel can dismantle, indirectly realize with bolt coaxial, to guarantee the accuracy of detection result further.Detection ends, connecting barrel remains in bolt end, and is equipped with cover and forms protection to bolt end, avoid bolt end surface appear rust or dirt and affect the accuracy of detection result.

Description

Technical Field

[0001] This utility model relates to a bolt ultrasonic testing fixture and a bolt end protection connection device, 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. Tightening screws are installed on the two main arms of the U-shaped support arm, allowing the ultrasonic probe to be clamped.

[0005] The probe drive device and probe clamping device in the aforementioned scanning device (inspection fixture) constitute a probe clamping and rotating device, realizing the automatic rotation of the ultrasonic probe and improving the reliability and repeatability of the inspection. However, when the aforementioned fixing device is fixedly connected to the end of the bolt, the extension length of multiple locking screws needs to be the same to ensure that the fixing device is coaxial with the bolt, and thus ensure that the rotation axis of the probe is coaxial with the bolt axis. However, this is difficult to control precisely in actual operation. Slight deviations in the number of rotations and rotation angle of the locking screws will result in different extension lengths. Therefore, this method makes it difficult to ensure that the fixing device is coaxial with the bolt, which will affect the accuracy of the inspection results.

[0006] Furthermore, in practical applications, bolts in use are typically inspected periodically to ensure they are in normal service condition. However, existing inspection fixtures require reinstallation and adjustment of the fixing device and bolt coaxiality for each inspection, affecting inspection efficiency. Additionally, because each inspection involves scanning the bolt end face, there is a lack of means to protect the bolt ends during off-inspection periods. If rust or dirt appears on the bolt end face, it will affect the accuracy of the inspection results. Utility Model Content

[0007] The purpose of this utility model is to provide a bolt ultrasonic testing fixture to solve the problems of existing testing fixtures, such as difficulty in ensuring the coaxiality of the fixing device and the bolt, which affects the accuracy of the test results; the need to reinstall and adjust the coaxiality of the fixing device and the bolt each time it is used, which affects the testing efficiency; and the lack of means to protect the bolt end during non-testing periods, which leads to rust or dirt on the bolt end face and affects the accuracy of the test results. The purpose of this utility model is also to provide a bolt end protection connection device to solve the above problems.

[0008] To achieve the above objectives, the ultrasonic testing fixture for bolts in this utility model adopts the following technical solution: An ultrasonic testing fixture for bolts includes a fixing device for fixing to the outside of the bolt and for mounting a probe clamping and rotating device. The fixing device includes a connecting cylinder and a mounting cylinder. The inner wall of the connecting cylinder is provided with an internal thread for engaging with the external thread at the end of the bolt. The mounting cylinder is used to mount the probe clamping and rotating device. The connecting cylinder is provided with a connecting structure that is coaxial with and detachably connected to the mounting cylinder, so that the mounting cylinder can be removed after the test and the connecting cylinder can remain at the end of the bolt. The connecting cylinder is provided with a protective cover for sealing the opening of the connecting cylinder. The connecting cylinder is provided with a connecting structure that is detachably connected to the protective cover, so that the protective cover can be removed and the connecting cylinder can be connected to the mounting cylinder when the test is required.

[0009] 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 fixing device includes a connecting cylinder and a mounting cylinder. The inner wall of the connecting cylinder is provided with an internal thread for engaging with the external thread of the bolt end. In this way, during testing, the connecting cylinder can be directly screwed onto the bolt end, which can ensure that the connecting cylinder and the bolt are coaxial, and at the same time, it is easy to install without repeated adjustments, which can improve the testing efficiency.

[0010] The mounting cylinder is used to mount the probe clamping and rotating device. The connecting cylinder is provided with a connecting structure that is coaxial with and detachably connected to the mounting cylinder. By being coaxial with the connecting cylinder, the mounting cylinder indirectly achieves coaxiality with the bolt, thereby ensuring that the rotation axis of the probe clamping and rotating device is coaxial with the bolt, thus guaranteeing the accuracy of the test results. Furthermore, after the test is completed, the mounting cylinder can be removed, leaving the connecting cylinder at the bolt end. This eliminates the need to reinstall the connecting cylinder for subsequent tests; simply connecting the connecting cylinder to the mounting cylinder is sufficient.

[0011] The connecting cylinder is equipped with a protective cap for sealing its opening. The connecting cylinder also features a detachable connection structure for attaching to the cap. During periods of non-inspection, the cap can be installed on the connecting cylinder to seal its opening, protecting the external threads and end face of the bolts and preventing corrosion or contamination, thus ensuring the accuracy of subsequent inspection results. When inspection is required again, the cap can be simply removed, and the connecting cylinder can be connected to the mounting cylinder, making operation very convenient.

[0012] Furthermore, the connecting structure on the connecting cylinder for connecting the mounting cylinder and the connecting structure for connecting the protective cover are the same structure.

[0013] Furthermore, during use, the connecting cylinder and the mounting cylinder, as well as the connecting cylinder and the cover, are connected by a snap-fit ​​structure. The end of the connecting cylinder is provided with a claw, and the mounting cylinder and the cover are provided with corresponding slots, or the end of the connecting cylinder is provided with a slot, and the mounting cylinder and the cover are provided with corresponding claws.

[0014] Furthermore, the connecting cylinder includes a small-diameter cylinder and a large-diameter cylinder coaxially connected to the small-diameter cylinder. The inner wall of the small-diameter cylinder is provided with the internal thread, and the inner cavity of the large-diameter cylinder forms a protective cavity for accommodating the nut at the end of the bolt and protecting the nut.

[0015] Furthermore, the stepped surface between the small-diameter cylinder and the large-diameter cylinder forms a stop surface for stop engagement with the end face of the nut.

[0016] To achieve the above objectives, the bolt end protection connection device of this utility model adopts the following technical solution: A bolt end protection connection device includes a connecting cylinder. The inner wall of the connecting cylinder is provided with an internal thread for engaging with the external thread of the bolt end. The connecting cylinder is provided with a connection structure that is coaxial with and detachably connected to an installation cylinder of a bolt ultrasonic testing fixture, so that the installation cylinder can be removed after the test and the connecting cylinder can remain at the bolt end. The bolt end protection connection device also includes a cover for sealing the opening of the connecting cylinder. The connecting cylinder is provided with a connection structure that is detachably connected to the cover, so that the cover can be removed and the connecting cylinder can be connected to the installation cylinder when testing is required.

[0017] The beneficial effects of the above technical solution are as follows: This utility model is a pioneering invention. The bolt end protection connection device includes a connecting cylinder. The inner wall of the connecting cylinder is provided with an internal thread for engaging with the external thread of the bolt end. The connecting cylinder is provided with a connection structure that is coaxial with and detachably connected to the mounting cylinder of the bolt ultrasonic testing fixture. In this way, during testing, the connecting cylinder can be directly screwed onto the bolt end, which can ensure that the connecting cylinder is coaxial with the bolt and is easy to install without repeated adjustments, thereby improving testing efficiency.

[0018] The mounting sleeve, coaxially connected to the connecting sleeve, indirectly achieves coaxiality with the bolt, thus ensuring that the rotation axis of the probe clamping and rotating device is coaxial with the bolt, guaranteeing the accuracy of the test results. Furthermore, after the test is completed, the mounting sleeve can be removed, leaving the connecting sleeve at the bolt end. This eliminates the need to reinstall the connecting sleeve for subsequent tests; simply connect the connecting sleeve to the mounting sleeve.

[0019] The bolt end protection connection device also includes a cover for sealing the opening of the connecting cylinder. The connecting cylinder has a detachable connection structure for attaching to the cover. During periods when not under inspection, the cover can be installed on the connecting cylinder to seal the opening, thus protecting the external threads and end face of the bolt and preventing corrosion or contamination, ensuring the accuracy of subsequent inspection results. When inspection is required again, the cover can be simply removed, and the connecting cylinder can be connected to the mounting cylinder, making operation very convenient.

[0020] Furthermore, the connecting structure on the connecting cylinder for connecting the mounting cylinder and the connecting structure for connecting the protective cover are the same structure.

[0021] Furthermore, during use, the connecting cylinder and the mounting cylinder, as well as the connecting cylinder and the cover, are connected by a snap-fit ​​structure. The end of the connecting cylinder is provided with a claw, and the mounting cylinder and the cover are provided with corresponding slots, or the end of the connecting cylinder is provided with a slot, and the mounting cylinder and the cover are provided with corresponding claws.

[0022] Furthermore, the connecting cylinder includes a small-diameter cylinder and a large-diameter cylinder coaxially connected to the small-diameter cylinder. The inner wall of the small-diameter cylinder is provided with the internal thread, and the inner cavity of the large-diameter cylinder forms a protective cavity for accommodating the nut at the end of the bolt and protecting the nut.

[0023] Furthermore, the stepped surface between the small-diameter cylinder and the large-diameter cylinder forms a stop surface for stop engagement with the end face of the nut. Attached Figure Description

[0024] Figure 1 This is a perspective view of Embodiment 1 of the ultrasonic testing fixture for bolts of this utility model; Figure 2 This is a perspective view of the ultrasonic testing fixture for bolts of this utility model after removing the connecting cylinder in Embodiment 1; Figure 3 This is a perspective view of the mounting cylinder in Embodiment 1 of the ultrasonic testing fixture for 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 ultrasonic testing fixture for bolts of this utility model; Figure 5 This is a perspective view of the probe clamping device in Embodiment 1 of the ultrasonic testing fixture for bolts of this utility model; Figure 6 This is a front view of the probe clamping device in Embodiment 1 of the ultrasonic testing fixture for 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 ultrasonic testing fixture for bolts of this utility model; Figure 8 This is a perspective view of the connecting cylinder in Embodiment 1 of the ultrasonic testing fixture for 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 ultrasonic testing fixture for bolts of this utility model; Figure 10 This is a perspective view of Embodiment 2 of the ultrasonic testing fixture for bolts of this utility model; Figure 11 This is a perspective view of the connecting cylinder in Embodiment 2 of the ultrasonic testing fixture for bolts of this utility model; Figure 12 This is an exploded view of the connecting cylinder and the protective cover in Embodiment 2 of the ultrasonic testing fixture for bolts of this utility model.

[0025] 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. Mounting cylinder jaw; 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; 1. Linear guide rail; 311. Rack; 32. Slider; 33. Clamping claw; 34. Adjustment and locking mechanism; 340. Drive gear; 341. First gear; 342. Second gear; 343. First sprocket; 344. First chain; 345. Second sprocket; 346. Second chain; 347. First transmission gear; 348. Idler gear; 349. Second transmission gear; 35. Power supply; 4. Probe; 5. Protective cover; 51. Protective cover claw; 6. Bolt. Detailed Implementation

[0026] To address the technical problems existing in the prior art, the basic concept of this utility model is to configure the fixing device as including a connecting cylinder and a mounting cylinder. The connecting cylinder is directly threaded to the end of the bolt, ensuring coaxiality with the bolt without adjustment. The mounting cylinder is coaxial with and detachable from the connecting cylinder, indirectly achieving coaxiality with the bolt. This ensures that the rotation axis of the probe clamping and rotating device is coaxial with the bolt, guaranteeing the accuracy of the test results. After the test, the connecting cylinder remains at the end of the bolt and is fitted with a protective cap to protect the bolt end from rust or dirt. The protective cap is detachable from the connecting cylinder; for the next test, the protective cap can be removed and the connecting cylinder connected to the mounting cylinder.

[0027] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0028] The implementation method of the ultrasonic testing fixture for bolts in this utility model is as follows: Combination Figure 1 and Figure 2 As shown, the ultrasonic testing fixture for bolts includes a fixing device 1 that is coaxially fixed to the outside of the bolt 6 during use, a probe driving device 2 that is mounted on the fixing device 1 to drive 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 to clamp the probe 4. The probe driving device 2 and the probe clamping device 3 together constitute a probe clamping and rotating device, and therefore the probe clamping and rotating device is mounted on the fixing device 1.

[0029] 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. The end of the bolt shank and the nut are 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 condition. 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.

[0030] The fixing device 1 in this utility model includes a connecting cylinder 11 and a mounting cylinder 12. The connecting cylinder 11 is responsible for direct connection with the bolt 6. Figure 8 As shown, the inner wall of the connecting cylinder 11 is provided with an internal thread 1111 for engaging with the external thread at the end of the bolt 6. Through this direct connection, the connecting cylinder 11 can be easily fixed to the outside of the bolt 6 and coaxial with the bolt 6. Compared with the existing technology of tightening the bolt by controlling the extension length of multiple set screws, the fixing method of this utility model is simpler to operate, does not require repeated adjustment of the set screws, can improve the detection efficiency, and ensures coaxial accuracy.

[0031] 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 coaxially and detachably connected. Therefore, the connecting cylinder 11 is provided with a connection structure for coaxial and detachable connection with the mounting cylinder 12. During testing, the connecting cylinder 11 can be first assembled to the end of the bolt 6. After the connecting cylinder 11 is in place, the mounting cylinder 12, which contains the probe drive device 2 and the probe clamping device 3, is then connected to the connecting cylinder 11. The connecting cylinder 11 has a simpler structure, is lighter, and is easier to install. By being coaxial with the connecting cylinder 11, the mounting cylinder 12 indirectly achieves coaxiality with the bolt 6, thereby ensuring that the rotation axis of the probe clamping device 3 is coaxial with the bolt 6, thus guaranteeing the accuracy of the test results.

[0032] Furthermore, after the inspection is completed, the mounting cylinder 12 can be disconnected from the connecting cylinder 11, 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 connected to the connecting cylinder 11, making the operation more convenient.

[0033] At the same time, such as Figure 9As shown, the connecting cylinder 11 is equipped with a protective cover 5 for sealing the opening of the connecting cylinder 11. The connecting cylinder 11 is provided with a connecting structure for detachable connection with the protective cover 5. During periods when not under inspection, the protective cover 5 can be installed on the connecting cylinder 11 to seal the opening, thereby protecting the external threads and end face of the bolt, preventing rust or contamination, and ensuring the accuracy of the next inspection result. Furthermore, when the next inspection is required, the protective cover 5 can be directly removed and the connecting cylinder 11 connected to the mounting cylinder 12, making the operation very convenient.

[0034] Furthermore, the connecting structure on the connecting cylinder 11 for connecting the mounting cylinder 12 and the connecting structure for connecting the cover 5 are the same structure. This eliminates the need to process two sets of connecting structures on the connecting cylinder 11, making the structure of the connecting cylinder 11 simpler and the manufacturing cost lower.

[0035] Specifically, in this embodiment, the connecting cylinder 11 and the mounting cylinder 12, and the connecting cylinder 11 and the protective cover 5 are connected by snap-fit ​​structures. For example... Figure 8 and Figure 9 As shown, the end of the connecting cylinder 11 is provided with a slot 1112, and multiple slots 1112 are evenly distributed circumferentially; in this embodiment, there are four. The cover 5 is provided with a corresponding number of cover claws 51, and the mounting cylinder 12 is provided with a corresponding number of mounting cylinder claws 123. Figure 2 and Figure 3 As shown, the cover claw 51 and the mounting cylinder claw 123 are the same size and are both adapted to the slot 1112 to ensure the snap-fit ​​accuracy. In particular, for the mounting cylinder 12, the coaxial connection between the mounting cylinder 12 and the connecting cylinder 11 is achieved through the snap-fit ​​between multiple mounting cylinder claws 123 and the corresponding slots 1112.

[0036] The snap-fit ​​structure is existing technology. Specifically, the slot 1112 includes an insertion slot and a locking slot. The opening of the insertion slot is located on the end face of the connecting cylinder 11. The locking slot is connected to the end of the insertion slot and extends through the outer circumferential surface of the connecting cylinder 11, forming a slot on the outer circumferential surface as well. Both the cover claw 51 and the mounting cylinder claw 123 are elastic and have locking protrusions at their ends. During installation, the cover claw 51 or the mounting cylinder claw 123 is first inserted into the insertion slot and undergoes elastic deformation. Guided by the insertion slot, when it reaches the end, the locking protrusion pops out and engages with the locking slot, achieving the snap-fit ​​connection with the connecting cylinder 11.

[0037] In other embodiments, a claw can be provided at the end of the connecting cylinder 11. In this case, the mounting cylinder 12 and the cover 5 are provided with corresponding slots, and the snap-fit ​​installation effect is the same.

[0038] In other embodiments, the connection between the connecting cylinder 11 and the mounting cylinder 12, and between the connecting cylinder 11 and the cover 5, may not be via a snap-fit ​​structure. For example, the connecting cylinder 11 and the mounting cylinder 12 may be connected by bolts to ensure coaxiality. Specifically, a flange with bolt holes is provided at the end of the connecting cylinder 11, and a flange with bolt holes is also provided at the end of the mounting cylinder 12. Bolts pass through the bolt holes on both the connecting cylinder 11 and the mounting cylinder 12 and are connected to nuts to secure them. In this case, the cover 5 also has bolt holes, and the cover 5 and the connecting cylinder 11 are connected by the same set of bolts and nuts.

[0039] In other embodiments, the connecting cylinder 11 and the mounting cylinder 12, and the connecting cylinder 11 and the cover 5, can also be magnetically connected. For example, the end of the connecting cylinder 11 has a built-in magnetic block, the mounting cylinder 12 and the cover 5 are both made of metal, and the connecting cylinder 11 is fixed by adsorption with the mounting cylinder 12 and the cover 5.

[0040] In other embodiments, the connecting cylinder 11 and the mounting cylinder 12, and the connecting cylinder 11 and the cover 5, can also be connected by threads. For example, an internal thread is provided on the inner wall of the connecting cylinder 11, and the mounting cylinder 12 and the cover 5 are provided with matching external threads. Alternatively, an external thread is provided on the outer wall of the connecting cylinder 11, and the mounting cylinder 12 and the cover 5 are provided with matching internal threads.

[0041] All the above embodiments enable the connecting structure on the connecting cylinder 11 for connecting the mounting cylinder 12 and the connecting structure for connecting the cover 5 to be the same structure. Of course, in other embodiments, the connecting structures for connecting the mounting cylinder 12 and the cover 5 may not be the same structure. For example, a snap-fit ​​connection may still be used, but two sets of slots are provided at the end of the connecting cylinder 11. The two sets of slots have different specifications, and the specifications of the connected claws are also different. One set of slots engages with the claws of the mounting cylinder, and the other set of slots engages with the claws of the cover. Alternatively, a flange and a set of slots may be provided at the end of the connecting cylinder 11. The flange is bolted to the mounting cylinder, and the slot engages with the claws of the cover. Or, the flange is bolted to the cover, and the slot engages with the claws of the mounting cylinder.

[0042] 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 coaxially connected to the small diameter cylinder 111. 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. Therefore, the inner cavity of the large diameter cylinder 112 constitutes a protective cavity for accommodating the nut at the end of the bolt 6 and protecting the nut, thus protecting both the end of the bolt 6 and the nut.

[0043] Furthermore, the stepped surface between the small-diameter cylinder 111 and the large-diameter cylinder 112 forms a stop surface for a stop engagement with the end face of the nut. Thus, when installing the connecting cylinder 11, it is simply screwed until the stepped surface stops the nut end face. The stepped surface forms an installation standard, facilitating the installation of the connecting cylinder 11. Of course, in other embodiments, the stepped surface may not form a stop surface. For example, when the connecting cylinder 11 is screwed to a certain extent, the end face of the connecting cylinder 11 directly abuts against the component, at which point the stepped surface has not yet abutted against the end face of the nut.

[0044] In other embodiments, such as Figure 10 , Figure 11 and Figure 12 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 5, it only protects the end of the bolt and does not protect the nut.

[0045] Furthermore, in this embodiment, the connecting cylinder 11 is preferably made of a non-metallic material, such as nylon or PEEK, but in other embodiments it can also be made of a metallic material. The mounting cylinder 12 and the cover 5 are both made of lightweight alloy material, which has lightweight and corrosion-resistant properties, but non-metallic materials such as nylon or PEEK can also be used.

[0046] Combination 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.

[0047] The probe clamping device 3 is located inside the outer extension portion, specifically, part of it is located inside the mounting cylinder 12 and the rest is located inside the connecting cylinder 11. Of course, if in other embodiments the connecting cylinder 11 and the mounting cylinder 12 are a fixed cylinder as a whole, then the probe clamping device 3 is located inside the outer extension portion of the integrated fixed cylinder.

[0048] Combination Figure 2 , Figure 3 and Figure 4As 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.

[0049] 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.

[0050] 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 figure). 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this embodiment, racks 311 are respectively provided on both sides of the linear slide rail 31. The aforementioned gears include two first gears 341 meshing with the rack 311 on one side and two second gears 342 meshing with the rack 311 on the other side. The two first gears 341 and the two second gears 342 rotate synchronously but in opposite directions to realize 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] In addition, such as Figure 2 and Figure 3As 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.

[0064] 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, the connecting sleeve 11 can be removed and reinstalled during the next test.

[0065] The implementation method of the bolt end protection connection device in this utility model is as follows: The bolt end protection connection device includes a connecting cylinder and a cover. The specific structure of the connecting cylinder is the same as that of the connecting cylinder in the above-mentioned bolt ultrasonic testing fixture implementation method. The specific structure of the cover is the same as that of the cover in the above-mentioned bolt ultrasonic testing fixture implementation method. The connection method and function are also the same, and will not be repeated here.

[0066] 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. An ultrasonic testing tool for a bolt, comprising a fixing device for fixing to the outside of the bolt and for mounting a probe holding and rotating device, characterized in that, The fixing device includes a connecting cylinder and a mounting cylinder. The inner wall of the connecting cylinder is provided with an internal thread for engaging with the external thread at the end of the bolt. The mounting cylinder is used to install the probe clamping and rotating device. The connecting cylinder is provided with a connecting structure that is coaxial with and detachably connected to the mounting cylinder, so that the mounting cylinder can be removed after the test and the connecting cylinder can remain at the end of the bolt. The connecting cylinder is provided with a protective cover for sealing the opening of the connecting cylinder. The connecting cylinder is provided with a connecting structure that is detachably connected to the protective cover, so that the protective cover can be removed and the connecting cylinder can be connected to the mounting cylinder when the test is required.

2. The ultrasonic testing tooling for bolts according to claim 1, wherein, The connecting structure on the connecting cylinder for connecting the mounting cylinder and the connecting structure for connecting the protective cover are the same structure.

3. The ultrasonic testing tooling for a bolt of claim 2, wherein, During use, the connecting cylinder and the mounting cylinder, as well as the connecting cylinder and the cover, are connected by a snap-fit ​​structure. The end of the connecting cylinder is provided with a claw, and the mounting cylinder and the cover are provided with corresponding slots, or the end of the connecting cylinder is provided with a slot, and the mounting cylinder and the cover are provided with corresponding claws.

4. The ultrasonic testing tool for a bolt according to any one of claims 1 to 3, characterized in that, The connecting cylinder includes a small-diameter cylinder and a large-diameter cylinder coaxially connected to the small-diameter cylinder. The inner wall of the small-diameter cylinder is provided with the internal thread, and the inner cavity of the large-diameter cylinder forms a protective cavity for accommodating the nut at the end of the bolt and protecting the nut.

5. The ultrasonic testing tooling for a bolt of claim 4, wherein, The stepped surface between the small-diameter cylinder and the large-diameter cylinder forms a stop surface for repositioning with the end face of the nut.

6. A bolt end protection connection device, characterized in that, The device includes a connecting cylinder with an internal thread on its inner wall for engaging with the external thread of the bolt end. The connecting cylinder has a coaxial and detachable connection structure for connecting with the mounting cylinder of the bolt ultrasonic testing fixture, so that the mounting cylinder can be removed after testing and the connecting cylinder can remain at the bolt end. The bolt end protective connection device also includes a cover for sealing the opening of the connecting cylinder. The connecting cylinder has a detachable connection structure for connecting with the cover, so that the cover can be removed and the connecting cylinder can be connected to the mounting cylinder when testing is required.

7. The bolt end protection connection device according to claim 6, characterized in that, The connecting structure on the connecting cylinder for connecting the mounting cylinder and the connecting structure for connecting the protective cover are the same structure.

8. The bolt end protection connection device according to claim 7, characterized in that, In use, the connecting cylinder and the mounting cylinder, and the connecting cylinder and the cover are connected by a snap-fit ​​structure. The end of the connecting cylinder is provided with a claw, and the mounting cylinder and the cover are provided with corresponding slots, or the end of the connecting cylinder is provided with a slot, and the mounting cylinder and the cover are provided with corresponding claws.

9. The bolt end protective connection device according to any one of claims 6 to 8, characterized in that, The connecting cylinder includes a small-diameter cylinder and a large-diameter cylinder coaxially connected to the small-diameter cylinder. The inner wall of the small-diameter cylinder is provided with the internal thread, and the inner cavity of the large-diameter cylinder forms a protective cavity for accommodating the nut at the end of the bolt and protecting the nut.

10. The bolt end protection connection device according to claim 9, characterized in that, The stepped surface between the small-diameter cylinder and the large-diameter cylinder forms a stop surface for repositioning with the end face of the nut.

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