Small tapping device with crack detection

Abstract

The application provides a small tapping device with crack detection, which comprises a rack and a tapping assembly arranged on the rack. The tapping assembly comprises a mounting frame, a driving unit and a tapping rod. The driving unit drives the tapping rod to rotate to complete tapping processing. A detection mechanism is further arranged on the rack. The detection mechanism comprises a mounting assembly and a detection assembly. The detection assembly is mounted on the rack through the mounting assembly and adopts an ultrasonic detection method. The detection assembly comprises a bearing part in a ring structure and a detection part sliding on a circular track of the bearing part. A positioning part is arranged at the center of the circular track and can be inserted into a bottom hole to be tapped. The positioning part is inserted into the bottom hole to achieve pre-positioning. The movement track of the detection part is coaxial with the hole axis, thereby driving the detection part to continuously scan and detect the surrounding area of the hole along the ring track, effectively covering the thread bearing area, improving the detection accuracy and consistency, reducing the risk of missed detection, and providing reliable protection for subsequent tapping processing.

Description

Technical Field

[0001] This invention relates to the field of tapping, specifically to a small tapping device with crack detection. Background Technology

[0002] Tapping, a common machining process, involves using a tap to cut or shape the wall of a pre-drilled hole to create an internal thread. This process is widely used in the connection structures of various mechanical parts, and its quality directly affects the thread's fit accuracy and load-bearing capacity. However, during tapping, the tap must withstand significant torque and radial stress. If the material around the pre-drilled hole has defects such as cracks, inclusions, or localized porosity, these defects can easily propagate during tapping, leading to tap breakage or thread failure, thus affecting product quality and machining safety.

[0003] Therefore, non-destructive testing (NDT) of the area near the bottom hole before tapping is of great significance. While existing technologies include ultrasonic testing for workpiece flaw detection, these processes often rely on manual operation or simple reciprocating scanning paths, lacking clear path planning and geometric constraints, resulting in significant randomness and uncertainty in the detection trajectory. Since the area around the bottom hole is a stress concentration zone, its defect distribution exhibits certain circumferential characteristics. Existing testing methods struggle to perform targeted coverage scanning of this area, easily leading to localized blind spots or uneven repeated testing.

[0004] Meanwhile, because the detection path is not regular, the relative posture and coupling state between the probe and the workpiece surface are difficult to maintain during the movement, which can easily cause fluctuations in the detection signal, thereby reducing the consistency and reliability of the detection results.

[0005] Therefore, a small tapping device with crack detection is provided to address the above problems. Summary of the Invention

[0006] To address the problems of irregular detection paths, insufficient coverage, blind spots, and poor detection stability and consistency in existing ultrasonic testing of the area near the bottom hole before tapping, this invention provides a small tapping device with crack detection.

[0007] The present invention solves the above-mentioned technical problems through the following technical solutions: The present invention provides a small tapping device with crack detection, including a frame, at least one tapping assembly is provided on the frame, the tapping assembly includes a mounting frame, the mounting frame is fixed on the frame, and a drive unit is provided on the mounting frame, the drive unit drives the tapping rod to rotate. The testing organization includes a mounting assembly and a testing assembly that performs ultrasonic testing. The testing assembly is mounted on a frame via the mounting assembly. The testing assembly includes a ring-shaped support portion and a testing portion that slides along a circular trajectory on the support portion. The detection assembly also includes a positioning part for positioning. The positioning part is located at the center of the circular trajectory of the detection part and can be inserted into the hole to be tapped. The detection part moves in a circular trajectory on the bearing part with the positioning part as the central axis.

[0008] By pre-positioning the positioning part into the pilot hole to be tapped, a stable reference center can be established using the hole itself. This ensures that the movement trajectory of the detection part maintains good coaxiality with the hole axis, thereby reducing offset errors and improving positioning accuracy and repeatability. Based on this, the detection part moves along a circular trajectory on the bearing part, causing the ultrasonic probe to continuously scan the surrounding circumferential area around the hole center, achieving effective coverage of the thread bearing area.

[0009] In this technical solution, the drive unit includes a drive motor and a transmission unit. The drive motor is fixed on the mounting bracket. The drive motor is connected to the drive pulley through the transmission unit. The drive pulley is connected to two driven pulleys through the transmission belt. A drill rod and a tapping rod are fixed at the bottom center of the two driven pulleys, respectively.

[0010] Specifically, both the drive pulley and the driven pulley are mounted on the top of the top side wall of the mounting frame, and the drill rod and tapping rod extend through the top side wall of the mounting frame to the surface of the frame.

[0011] In this technical solution, the installation component includes a support plate, which is fixed on the frame and the top side wall of the support plate is flush with the top side wall of the frame. The top of the support plate is fixed with a support frame by multiple support vertical rods, and a support beam is slidably connected to the support frame. The load-bearing part is mounted on the load-bearing crossbeam, and the load-bearing part can slide on the load-bearing crossbeam.

[0012] Specifically, both ends of the load-bearing crossbeam are fixed with load-bearing sliders, and the two load-bearing sliders are slidably connected to the surfaces of the two opposite side beams of the load-bearing frame.

[0013] In this technical solution, the bearing part includes a ring-shaped bearing guide rail, on which a first guide slider is slidably connected, and the detection part is fixed on the outer wall of the first guide block and located in the inner ring cavity of the bearing guide rail; The positioning part includes a positioning vertical rod, which coincides with the central axis of the bearing guide rail. The positioning vertical rod is fixed on the first guide slider by a synchronizing rod. The bottom of the positioning vertical rod is provided with a positioning unit that can extend into the hole. The positioning vertical rod is aligned with the central axis of the hole by the positioning unit. The load-bearing guide rail is connected to the mounting assembly via connectors.

[0014] In this technical solution, the positioning vertical rod includes an upper connecting rod and a lower connecting rod that are slidably sleeved together. A first spring is sleeved at the connection between the upper connecting rod and the lower connecting rod. The two ends of the first spring are respectively fixed to the outer walls of the upper connecting rod and the lower connecting rod. The positioning unit is installed in the bottom area of ​​the lower connecting rod. The upper connecting rod is fixed to the first guide slider by a synchronizing rod, and the detection end face of the detection part is higher than the positioning unit.

[0015] In this technical solution, the connector includes at least two connecting vertical rods arranged in a ring array. The connecting vertical rods are fixed on the annular outer wall of the bearing guide rail. The bearing vertical rods are telescopic, and a second spring is sleeved on the surface of the bearing vertical rods. The top of the bearing vertical rods is fixed on the first slider through a connecting frame. The first slider is slidably connected to the bearing crossbeam.

[0016] Preferably, the top of the upper connecting rod passes through the first slider and extends to the top of the first slider, and a first sliding groove is provided on the bearing beam for the upper connecting rod and the first slider to slide synchronously.

[0017] In this technical solution, the detection unit includes a connecting crossbar and a fixing rod. One end of the connecting crossbar is fixed on the guide rail, and the other end is fixed with a fixing rod arranged vertically. A detection probe is fixed at the bottom of the fixing rod.

[0018] In this technical solution, the positioning unit includes three positioning rods arranged in a ring array. The bottom end of the positioning rod is rotatably connected to the outer wall of the bottom area of ​​the lower connecting rod, and a coil spring is provided at the rotatable connection between the positioning rod and the lower connecting rod. The positioning rod is tilted away from the side of the lower connecting rod.

[0019] This technical solution also includes an adjustment component for adjusting the radius of the circular motion of the adjustable detection probe. The adjustment component includes a limiting ring plate coaxially arranged with the bearing guide rail, and a wave-shaped guide ring surface is provided on the inner ring of the limiting ring plate. The detection unit can move and rebound radially along the limiting ring plate. The bottom of the area where the detection unit moves and rebounds radially along the limiting ring plate is connected to an overlapping member, which is always overlapping the outer wall of the limiting ring plate. The drive unit drives the limit ring plate to rotate.

[0020] In this technical solution, the driving unit includes a driving component and a transmission component. The transmission component includes an annular transmission rack. The transmission rack is fixed with an equal number of second guide sliders through multiple second connecting rods arranged in an annular array. The second guide sliders are slidably connected to an annular guide rail. The annular guide rail is fixed to the bottom side wall of the bearing guide rail through multiple evenly distributed first connecting rods. The driving component includes a driving gear, which meshes with a ring-shaped transmission rack. A rotating vertical rod is fixed at the center of the circular surface at the top of the driving gear. A bushing is fitted onto the surface of the rotating vertical rod, and the bushing is fixed to the bearing guide rail by a rod. The bushing allows the rotating vertical rod to move synchronously with the bearing guide rail and the transmission rack in the vertical direction without affecting the rotation of the rotating vertical rod.

[0021] The present invention has at least the following positive and progressive effects: By inserting the positioning part into the pilot hole to be tapped, pre-positioning is achieved. The hole itself can be used as a reference to establish a stable geometric center, thus ensuring that the movement trajectory of the detection part is highly coaxial with the hole axis. This effectively eliminates eccentricity errors caused by manual placement or external clamping, improving the consistency of the detection starting point and the repeatability of positioning. Based on this, the detection part moves along a preset annular trajectory on the bearing part, allowing the ultrasonic probe to continuously scan the circumferential area with the hole as the center. This enables full coverage detection of the main bearing area (i.e., the material area around the hole) after thread forming.

[0022] This circular scanning method gives the detection path a clear geometric regularity. Compared with random or reciprocating scanning, it not only significantly reduces the probability of blind spots and avoids missing local areas, but also allows for stable overlap between adjacent scanning areas, thereby improving the detection rate of micro-cracks or early defects. Simultaneously, the regularized motion trajectory helps maintain the relative posture stability between the probe and the workpiece surface, reducing the impact of coupling fluctuations on the echo signal and improving the consistency and comparability of the detection signal.

[0023] Furthermore, the aforementioned structure facilitates integration with automatic control systems, enabling standardized and procedural testing processes. This results in higher repeatability and traceability of test results, and provides a reliable basis for quality judgment in subsequent tapping processes, thereby reducing the risk of broken taps or thread failures during the tapping process at the source. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the external structure of a small tapping device with crack detection according to a specific embodiment of the present invention. Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 This is a schematic diagram illustrating the structure of the detection mechanism of a small tapping device with crack detection according to a specific embodiment of the present invention; Figure 4 for Figure 3 A structural diagram from another perspective; Figure 5 for Figure 4 A magnified schematic diagram of the structure at point I; Figure 6 This is a schematic diagram illustrating the structure of the clamping assembly of a small tapping device with crack detection according to a specific embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the connection structure between the detection component and the supporting beam of a small tapping device with crack detection according to a specific embodiment of the present invention. Figure 8 for Figure 7 A schematic diagram of the structure viewed from below; Figure 9 for Figure 7 A top-view structural diagram; Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure at point AA; Figure 11 for Figure 10 A magnified schematic diagram of the structure at point J; Figure 12 for Figure 9 Schematic diagram of the cross-sectional structure at BB; Figure 13 This is a schematic diagram illustrating the structure of the positioning unit of a small tapping device with crack detection according to a specific embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures 1. Rack; 2. Tapping assembly; 21. Mounting bracket; 22. Drive motor; 23. Transmission unit; 24. Drive pulley; 25. Driven pulley; 26. Drill rod; 27. Tapping rod; 3. Installation components; 31. Bearing plate; 32. Bearing frame; 33. Supporting vertical rod; 34. Bearing crossbeam; 341. Bearing slider; 342. First sliding through groove; 35. Second sliding through groove; 4. Detection Components; 41. First Slider; 42. Upper Connecting Rod; 43. Lower Connecting Rod; 431. First Spring; 44. Positioning Unit; 441. Overlap Plate; 442. Positioning Rod; 443. Guide Arc Rod; 45. First Guide Slider; 451. Synchronizing Rod; 46. Bearing Guide Rail; 47. Connecting Vertical Rod; 471. Connecting Frame; 472. Second Spring; 48. Connecting Horizontal Rod; 481. Fixing Rod; 482. Detection Probe; 483. Third Spring; 5. Adjustment assembly; 51. Transmission rack; 52. Guide rail; 521. First connecting rod; 53. Second guide slider; 531. Second connecting rod; 532. Third connecting rod; 54. Limiting ring plate; 55. Guide ring surface; 56. Driving component; 561. Drive gear; 562. Rotating vertical rod; 563. Second slider; 57. Transmission rod; 571. Rotating roller; 6. Clamping assembly; 61. Transmission plate; 62. Clamping plate; 63. Screw; 64. Connecting sleeve; 65. Threaded sleeve. Detailed Implementation

[0026] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0027] like Figure 1 and Figure 2 As shown, the small tapping device with crack detection includes a frame 1, on which at least one tapping assembly 2 is mounted. The tapping assembly 2 includes a mounting frame 21, which is fixed to the frame 1. A drive unit is mounted on the mounting frame 21, which drives the tapping rod 27 to rotate. It also includes a detection mechanism, which includes a mounting assembly 3 and a detection assembly 4 for ultrasonic detection. The detection assembly 4 is mounted on the frame 1 via the mounting assembly 3. The detection assembly 4 includes a ring-shaped support part and a detection part that slides in a circular trajectory on the support part. The detection assembly 4 also includes a positioning part for positioning. The positioning part is located at the center of the circular trajectory of the detection part and can be inserted into the hole to be tapped. The detection part moves in a circular trajectory on the support part with the positioning part as the central axis to realize the flaw detection of the area near the hole to be tapped.

[0028] Example 1

[0029] In this embodiment, as Figure 1 and Figure 2 As shown, the drive unit includes a drive motor 22 and a transmission unit 23. The drive motor 22 is fixed on the mounting bracket 21. The drive motor 22 is connected to the drive pulley 24 via the transmission unit 23. The drive pulley 24 is connected to two driven pulleys 25 via a transmission belt. A drill rod 26 and a tapping rod 27 are fixed at the bottom center of the two driven pulleys 25, respectively. The transmission unit 23 is preferably a speed reducer.

[0030] Specifically, both the drive pulley and the driven pulley 25 are mounted on the top of the top side wall of the mounting frame 21, and the drill rod 26 and the tapping rod 27 extend through the top side wall of the mounting frame 21 to the surface of the frame 1.

[0031] Both the drill rod 26 and the tapping rod 27 include a vertical rod, and a drilling bit and a tapping bit are respectively fixed to the bottom of the vertical rod on the drill rod 26 and the tapping rod 27.

[0032] On the surface of the frame 1 below the drill rod 26 and tapping rod 27, corresponding fixtures are respectively provided for clamping and positioning the workpiece. A lifting structure is set around the machining station, which can be implemented in two ways: one is that the area of ​​the machine body where the fixtures are located is a lifting structure, which drives the workpiece to rise and fall as a whole, realizing the switching between the drilling station and the tapping station; the other is that the top area of ​​the mounting bracket 21 that supports the drill rod 26, tapping rod 27 and drive motor 22 is a lifting structure, which drives the machining execution components to rise and fall, aligning them with the workpiece, thereby completing the drilling and tapping processes sequentially.

[0033] After drilling is completed and before tapping, an inspection mechanism is set up to conduct ultrasonic flaw detection on the area near the bottom hole to determine whether there are defects such as cracks, thereby providing quality assurance for subsequent tapping. The aforementioned lifting structure can be achieved through the telescopic movement of drive components such as hydraulic push rods and electric push rods.

[0034] Example 2

[0035] like Figure 3 As shown, the mounting assembly 3 includes a support plate 31, which is fixed on the frame 1. The top side wall of the support plate 31 is flush with the top side wall of the frame 1. A support frame 32 is fixed to the top of the support plate 31 by multiple support vertical rods 33. A support beam 34 is slidably connected to the support frame 32. The support part is mounted on the support beam 34 and can slide on the support beam 34.

[0036] Specifically, each end of the load-bearing crossbeam 34 is fixed with a load-bearing slider 341, and the two load-bearing sliders 341 are slidably connected to the surfaces of the two opposite side beams of the load-bearing frame 32. The side beams slidably connected to the load-bearing sliders 341 are not arranged parallel to the load-bearing crossbeam 34.

[0037] like Figure 7 and Figure 8 As shown, the bearing part includes a ring-shaped bearing guide rail 46, on which a first guide slider 45 is slidably connected. The detection part is fixed on the outer wall of the first guide block and located in the inner cavity of the bearing guide rail 46. The positioning part includes a positioning vertical rod, which coincides with the central axis of the bearing guide rail 46. The positioning vertical rod is fixed on the first guide slider 45 by a synchronizing rod 451. A positioning unit 44 that can extend into the hole is provided at the bottom of the positioning vertical rod. The positioning vertical rod is made to coincide with the central axis of the hole by the positioning unit 44. The bearing guide rail 46 is connected to the mounting assembly 3 by a connector.

[0038] During inspection, the positioning unit 44 at the bottom of the positioning vertical rod is inserted into the hole to be tapped. The positioning unit 44 makes the positioning vertical rod coincide with the central axis of the corresponding hole, so that the bearing guide rail 46 is coaxially set with the corresponding hole in the vertical direction. Then, the first guide slider 45 is pushed to slide on the bearing guide rail 46, which drives the inspection unit to move in a circle with the corresponding hole as the center, and performs flaw detection on the area near the hole.

[0039] like Figure 10 As shown, the positioning rod includes an upper connecting rod 42 and a lower connecting rod 43 that are slidably connected to each other. A first spring 431 is sleeved at the connection between the upper connecting rod 42 and the lower connecting rod 43. The two ends of the first spring 431 are respectively fixed to the outer walls of the upper connecting rod 42 and the lower connecting rod 43. The positioning unit 44 is installed in the bottom area of ​​the lower connecting rod 43. The upper connecting rod 42 is fixed to the first guide slider 45 through a synchronizing rod 451. The detection end face of the detection part is higher than the positioning unit 44.

[0040] Preferably, both the upper connecting rod 42 and the lower connecting rod 43 are round rods. The upper connecting rod 42 wraps around the surface of the connecting rod. The inner wall of the upper connecting rod 42 and the outer wall of the lower connecting rod 43 are respectively provided with a sliding groove in the form of an elongated strip and a connecting protrusion. The connecting protrusion slides inside the sliding groove. Through the engagement between the connecting protrusion and the sliding groove, the upper connecting rod 42 and the lower connecting rod 43 do not rotate relative to each other in the radial direction.

[0041] like Figure 7 As shown, the connector includes at least two connecting vertical rods 47 arranged in a ring array. The connecting vertical rods 47 are fixed on the annular outer wall of the bearing guide rail 46. The bearing vertical rods are telescopic, and a second spring 472 is sleeved on the surface of the bearing vertical rods. The two ends of the second spring 472 are respectively fixed to the two ends of the bearing vertical rods. The top of the bearing vertical rods is fixed to the first slider 41 through the connecting frame 471. The first slider 41 is slidably connected to the bearing crossbeam 34.

[0042] Specifically, the spring force coefficient of the first spring 431 is greater than that of the second spring 472.

[0043] like Figure 10 As shown, preferably, the top of the upper connecting rod 42 passes through the first slider 41 and extends to the top of the first slider 41, and the supporting crossbeam 34 is provided with a first sliding groove 342 for the upper connecting rod 42 and the first slider 41 to slide synchronously.

[0044] During inspection, the workpiece is placed on the support plate 31. Then, by sliding the support beam 34 on the support frame 32 and the first slider 41 on the beam, the positioning vertical rod is pre-adjusted to the area near the corresponding hole. Then, the positioning vertical rod is pressed down until the positioning unit 44 at the bottom of the positioning vertical rod is inserted into the corresponding hole. The self-centering positioning unit 44 makes the positioning vertical rod coaxial with the corresponding hole.

[0045] During the above process, the connecting vertical rod 47 is stretched, the second spring 472 on its surface is deformed, while the length of the positioning vertical rod remains unchanged, the first spring 431 on its surface does not deform, and the bearing guide rail 46 and the detection unit descend synchronously.

[0046] In one aspect, the positioning rod is then pressed down further. After the positioning unit 44 reaches its limit position, the lower connecting rod 43 remains in the vertical position along with the positioning unit 44. The upper connecting rod 42 begins to slide on the surface of the lower connecting rod 43, thereby driving the bearing guide rail 46 and the detection part to move further down until the detection end face on the detection part overlaps with the surface of the area near the hole. Then, the upper connecting rod 42 is pushed to rotate. The upper connecting rod 42 drives the first guide slider 45 to rotate on the bearing guide rail 46 through the synchronous rod 451, thereby driving the test component to perform circumferential operation in the area near the hole to detect whether there are cracks or other defects in the area near the hole.

[0047] On the other hand, when the depth of the corresponding hole is sufficient, during the continuous pressing of the positioning rod, the positioning unit 44 is completely submerged inside the corresponding hole, and then the pressing stops when the detection end face overlaps the workpiece surface.

[0048] After positioning is completed, the upper connecting rod 42 is rotated. The upper connecting rod 42 drives the first guide slider 45 to slide on the bearing guide rail 46 through the synchronous rod 451, thereby causing the detection end face on the detection part to make a circular motion on the workpiece surface near the hole. This performs regular circular trajectory detection.

[0049] The detection unit includes a connecting crossbar 48 and a fixing rod 481. One end of the connecting crossbar 48 is fixed on the guide rail 52, and the other end is fixed with the vertically arranged fixing rod 481. The bottom of the fixing rod 481 is fixed with a detection probe 482.

[0050] Specifically, the bottom sidewall of the detection probe 482 is the detection end face.

[0051] like Figure 13As shown, the positioning unit 44 includes three positioning rods 442 arranged in a circular array. The bottom end of the positioning rod 442 is rotatably connected to the outer wall of the bottom area of ​​the lower connecting rod 43, and a coil spring is provided at the rotatable connection between the positioning rod 442 and the lower connecting rod 43. The positioning rod 442 is inclined to the side away from the lower connecting rod 43, that is, in the normal state, the positioning rod 442 is inclined.

[0052] Preferably, a retractable guide arc rod 443 is connected to the outer wall of the positioning rod 442 and the lower connecting rod 43. An arc spring is sleeved on the surface of the guide arc rod 443. The rotation of the positioning rod 442 is guided by the guide arc rod 443. The arc spring increases the reaction force of the positioning rod 442 on the inner wall of the corresponding hole, thereby improving the reliability of positioning.

[0053] Preferably, an overlapping plate 441 is fixed to the surface of the lower connecting rod 43 at the top of the positioning rod 442. The overlapping plate 441 covers the surface of the corresponding hole. When the overlapping plate 441 overlaps the workpiece, it represents the limit position and state of the positioning plate's downward movement. Specifically, the normal state refers to the state where neither the arc spring nor the coil spring undergoes deformation.

[0054] When the positioning part is inserted into the corresponding hole, the inclined positioning rod 442 is pushed by the inner wall of the corresponding hole to rotate towards the side closer to the lower connecting rod 43. During the rotation of the positioning rod 442, the coil spring and the arc spring are deformed. Through the reaction of the coil spring and the arc spring, the lower connecting rod 43 is pushed to move, so that the lower connecting rod 43 is finally positioned on the central axis of the corresponding hole, thus completing the self-centering and positioning of the detection part.

[0055] Example 3

[0056] like Figure 7 and Figure 8 As shown, it also includes an adjustment component 5 for adjusting the radius of the circular motion of the detection probe 482. The adjustment component 5 includes a limiting ring plate 54 coaxially arranged with the bearing guide rail 46. A wave-shaped guide ring surface 55 is provided on the inner ring of the limiting ring plate 54. The detection part can move and rebound radially along the limiting ring plate 54. The bottom of the area where the detection part moves and rebounds radially along the limiting ring plate 54 is connected to an overlapping member. The overlapping member is always overlapping on the outer wall of the limiting ring plate 54. The limiting ring plate 54 is fixed to the second guide slider 53 by a third connecting rod 532. The driving part drives the limiting ring plate 54 to rotate.

[0057] The detection probe 482 is preferably an ultrasonic probe, used for ultrasonic flaw detection of the area to be tested. The other components of the ultrasonic flaw detection device, such as the ultrasonic generator, signal receiving and processing unit, and display unit, are all conventional technical configurations in the art, and therefore will not be described in detail in this solution, nor are they shown in the accompanying drawings.

[0058] The drive unit drives the limiting ring plate 54 to rotate, which in turn drives the guide ring surface 55 on the limiting ring plate 54 to rotate. The wavy guide ring surface 55 drives the detection unit to move radially in the limiting ring plate 54 through the overlapping parts, that is, drives the detection unit to move radially in the bearing guide rail 46, so as to realize the infinitely adjustable radius of the detection end face to make circular motion, thereby expanding the detection area and making the detection more flexible.

[0059] Specifically, such as Figure 11 As shown, the connecting crossbar 48 on the detection unit is a telescopic rod, and a third spring 483 is sleeved on the surface of the connecting crossbar 48. The two ends of the third spring 483 are respectively fixed to the two ends of the connecting crossbar 48. The end of the connecting crossbar 48 that is not connected to the first guide slider 45 is the area of ​​movement and rebound, that is, the bottom of the end of the connecting crossbar 48 away from the first guide slider 45 is fixed with an overlapping member.

[0060] Furthermore, the connecting member includes a vertically arranged transmission rod 57, which is fixed to the bottom of the end of the connecting crossbar 48 away from the first guide slider 45. A self-rotating roller 571 is sleeved on the surface of the transmission rod 57, and the self-rotating roller 571 is always connected to the guide ring surface 55 under the action of the elastic force of the third spring 483.

[0061] The drive unit includes a drive component 56 and a transmission component. The transmission component includes an annular transmission rack 51. A number of second guide sliders 53 are fixed to the transmission rack 51 in a corresponding annular array via multiple second connecting rods 531. The second guide sliders 53 are slidably connected to an annular guide rail 52. The annular guide rail is fixed to the bottom side wall of the bearing guide rail 46 via multiple evenly distributed first connecting rods 521. The drive component 56 includes a drive gear 561, which meshes with the annular transmission rack 51. A rotating vertical rod 562 is fixed at the center of the circular surface at the top of the drive gear 561. A bushing is fitted onto the surface of the rotating vertical rod 562, and the bushing is fixed to the bearing guide rail 46 via a rod. The bushing allows the rotating vertical rod 562 to move synchronously with the bearing guide rail 46 and the transmission rack 51 in the vertical direction without affecting the rotation of the rotating vertical rod 562.

[0062] The bushing is not shown in the figure. The bushing allows the rotating vertical rod 562 to move synchronously with the bearing guide rail 46 while being able to rotate, so that the drive gear 561 is always engaged with the transmission rack 51.

[0063] The annular guide rail 52, the annular transmission rack 51, and the annular load-bearing guide rail 46 are all coaxially arranged.

[0064] Preferably, the rotating vertical rod 562 passes through the first sliding groove 342 on the supporting crossbeam 34, and the rotating vertical rod 562 also passes through the second slider 563 that is slidably connected to the supporting crossbeam 34.

[0065] This ensures that the rotating vertical rod 562 and the positioning vertical rod are on the same vertical plane, making installation and operation easier.

[0066] Rotating the vertical rod causes the drive gear 561 to rotate, which in turn causes the transmission rack 51 to rotate, which in turn causes the limiting ring plate 54 to rotate. The guide ring surface 55 on the limiting ring plate 54 also rotates accordingly. During the rotation, the guide ring surface 55 pushes the detection probe 482 to move, thereby changing the radius of the circular motion of the detection probe 482 and adjusting the detection range.

[0067] After adjustment, lock the rotating vertical rod 562 by hand or other braking mechanism to stop it from rotating.

[0068] The braking structure can be a screw, which penetrates the side wall of the bushing or the side wall of the slider and overlaps the rotating vertical rod 562. The screw is threaded to the side wall of the bushing or the side wall of the slider.

[0069] Alternatively, a motor with a braking function can be directly fixed to the top of the rotating vertical rod 562, which drives the rotating vertical rod 562 to rotate. At the same time, the motor is mounted on the slider.

[0070] Example 4

[0071] like Figures 4-6 As shown, at least one clamping assembly 6 for clamping and fixing workpieces is provided on the support plate 31. The clamping assembly 6 includes two clamping units arranged in a centrally symmetrical manner. The clamping unit includes a transmission plate 61, which is slidably connected to the second sliding through groove 35 on the support plate 31. The transmission plate 61 passes through the support plate 31 through the second sliding through groove 35. A clamping plate 62 that overlaps with the workpiece is fixed to the top of the transmission plate 61. The bottom of the transmission plate 61 has an "L"-shaped structure. A threaded sleeve 65 arranged in a transverse direction is fixed to the end of the "L"-shaped structure area of ​​the transmission plate 61. A screw 63 is sleeved inside the threaded sleeve 65. The screw 63 and the threaded sleeve 65 are connected by threaded engagement. The screw 63 is installed on the connecting sleeve 64 and can rotate on the connecting sleeve 64. The connecting sleeve 64 is fixed to the support plate 31 by a rod.

[0072] Place the workpiece between the two clamping plates 62, and then rotate the two screws 63 one after the other or simultaneously. The rotation of the screws 63 drives the threaded sleeve 65 to move on its surface, thereby moving the clamping plates 62 to one side of the workpiece until the two clamping plates 62 clamp the workpiece on both sides.

[0073] Handles can be fixed to the corresponding ends of the rotating vertical rod 562, the positioning vertical rod, and the screw 63, or a motor can be directly installed. Combined with the motor's control system, mechanized testing can be achieved.

[0074] In summary, the present invention has been described in detail through specific embodiments. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various changes or modifications to these embodiments. Without departing from the principle and essence of the present invention, any changes or modifications made to its shape or structure should fall within the protection scope of the present invention, which is defined by the appended claims.

Claims

1. A small tapping device with crack detection, comprising a frame (1), wherein at least one tapping assembly (2) is disposed on the frame (1), the tapping assembly (2) comprising a mounting bracket (21), the mounting bracket (21) being fixed on the frame (1), and a drive unit being disposed on the mounting bracket (21), the drive unit driving the tapping rod (27) to rotate, characterized in that: The testing mechanism includes an installation component (3) and a testing component (4) for ultrasonic testing. The testing component (4) is installed on a frame (1) via the installation component (3). The testing component (4) includes a ring-shaped support part and a testing part that slides in a circular trajectory on the support part. The detection component (4) also includes a positioning part for positioning. The positioning part is located at the center of the circular trajectory of the detection part and can be inserted into the hole to be tapped. The detection part moves in a circular trajectory on the bearing part with the positioning part as the central axis.

2. The miniature tapping device with crack detection as described in claim 1, characterized in that: The drive unit includes a drive motor (22) and a transmission part (23). The drive motor (22) is fixed on the mounting bracket (21). The drive motor (22) is connected to the drive pulley (24) through the transmission part (23). The drive pulley (24) is connected to two driven pulleys (25) through the transmission belt. A drill rod (26) and a tapping rod (27) are fixed at the bottom center of the two driven pulleys (25), respectively.

3. The miniature tapping device with crack detection as described in claim 1, characterized in that: The mounting assembly (3) includes a support plate (31), which is fixed on the frame (1). A support frame (32) is fixed to the top of the support plate (31) by a plurality of support vertical rods (33). A support beam (34) is slidably connected to the support frame (32). The load-bearing part is installed on the load-bearing crossbeam (34).

4. The miniature tapping device with crack detection as described in claim 3, characterized in that: The bearing part includes a ring-shaped bearing guide rail (46), on which a first guide slider (45) is slidably connected, and the detection part is fixed on the outer wall of the first guide block; The positioning part includes a positioning vertical rod, which coincides with the central axis of the bearing guide rail (46), and the positioning vertical rod is fixed on the first guide slider (45) by a synchronizing rod (451). The bottom of the positioning vertical rod is provided with a positioning unit (44) that can extend into the hole. The load-bearing guide rail (46) is connected to the mounting assembly (3) via a connector.

5. The miniature tapping device with crack detection as described in claim 4, characterized in that: The positioning vertical rod includes an upper connecting rod (42) and a lower connecting rod (43) that are slidably sleeved together. A first spring (431) is sleeved at the connection between the upper connecting rod (42) and the lower connecting rod (43). The positioning unit (44) is installed in the bottom area of ​​the lower connecting rod (43). The upper connecting rod (42) is fixed on the first guide slider (45) by the synchronizing rod (451), and the detection end face of the detection part is higher than the positioning unit (44).

6. The miniature tapping device with crack detection as described in claim 4, characterized in that: The connector includes at least two connecting vertical rods (47) arranged in a ring array. The connecting vertical rods (47) are fixed on the outer wall of the bearing guide rail (46). The bearing vertical rods are telescopic and a second spring (472) is sleeved on the surface of the bearing vertical rods. The top of the bearing vertical rods is fixed on the first slider (41) through the connecting frame (471). The first slider (41) is slidably connected to the bearing beam (34).

7. The miniature tapping device with crack detection as described in claim 5, characterized in that: The detection unit includes a connecting crossbar (48) and a fixing rod (481). One end of the connecting crossbar (48) is fixed on the guide rail (52), and the other end is fixed with a fixing rod (481) arranged vertically. A detection probe (482) is fixed at the bottom of the fixing rod (481).

8. The miniature tapping device with crack detection as described in claim 4, characterized in that: The positioning unit (44) includes three positioning rods (442) arranged in a ring array. The bottom end of the positioning rod (442) is rotatably connected to the outer wall of the bottom area of ​​the lower connecting rod (43), and a coil spring is provided at the rotatable connection between the positioning rod (442) and the lower connecting rod (43). The positioning rod (442) is inclined toward the side away from the lower connecting rod (43).

9. The miniature tapping device with crack detection as described in claim 4, characterized in that: It also includes an adjustment component (5) for the radius of circular motion of the adjustable detection probe (482). The adjustment component (5) includes a limiting ring plate (54) coaxially arranged with the bearing guide rail (46). The inner ring of the limiting ring plate (54) is provided with a wave-shaped guide ring surface (55). The detection part can move and rebound radially along the limiting ring plate (54). The bottom of the area where the detection part moves and rebounds radially along the limiting ring plate (54) is connected to an overlapping member. The overlapping member is always overlapping on the outer wall of the limiting ring plate (54). The driving unit drives the limiting ring plate (54) to rotate.

10. The miniature tapping device with crack detection as described in claim 9, characterized in that: The drive unit includes a drive component (56) and a transmission component. The transmission component includes an annular transmission rack (51). The transmission rack (51) is fixed with an equal number of second guide sliders (53) through multiple second connecting rods (531) arranged in an annular array. The second guide sliders (53) are slidably connected to an annular guide rail (52). The annular guide rail is fixed to a bearing guide rail (46) through multiple evenly distributed first connecting rods (521). The driving component (56) includes a driving gear (561), which meshes with an annular transmission rack (51). A rotating vertical rod (562) is fixed at the center of the circular surface at the top of the driving gear (561), and a bushing is sleeved on the surface of the rotating vertical rod (562).

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