Shaft crack detection device

Abstract

The invention relates to a shaft crack detection device, and relates to the technical field of crack detection, the shaft crack detection device comprises a detection table, a first detection head and a second detection head, the detection table is provided with a detection column, the first detection head is slidably arranged on the detection column and is used for axial detection of shaft parts, and the second detection head is slidably arranged on the detection column. The second detection head is arranged on the detection table and used for detecting steps of the shaft parts, the detection table is rotationally provided with a first detection wheel and a second detection wheel, the detection table is provided with a driving assembly, and the driving assembly is used for driving the first detection wheel and the second detection wheel to rotate; the first detection wheel and the second detection wheel are used for placing the shaft part and driving the shaft part to rotate through friction, the detection column is provided with a moving assembly, and the moving assembly is used for driving the first detection head to move. The method has the effect of improving the detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of crack detection technology, and in particular to a shaft crack detection device. Background Technology

[0002] As core components of mechanical transmission systems, the surface integrity of shaft parts directly affects the operational safety of equipment. Currently, the industry commonly uses methods such as magnetic particle testing, ultrasonic testing, or laser probes for defect screening. However, traditional methods suffer from low testing efficiency and significant human error. With the upgrading of intelligent manufacturing, the demand for high-precision automated testing has surged, reflecting the market's urgent need for new testing technologies.

[0003] Related technologies include a dedicated inspection head for shaft parts that uses lasers or other methods to inspect shaft parts. During the inspection process, the user needs to hold the inspection head and scan it across the shaft part.

[0004] In actual testing, shaft parts not only need to be scanned along the axial direction, but many shaft parts also have annular step structures for installation. During testing, the shaft parts need to be rotated to scan both sides of the step again. The overall labor intensity of testing by hand is high and the efficiency is low when conducting large-scale testing. Summary of the Invention

[0005] To improve detection efficiency, this application provides a shaft crack detection device.

[0006] The shaft crack detection device provided in this application adopts the following technical solution: A shaft crack detection device includes a detection platform, a first detection head, and a second detection head. The detection platform is provided with a detection column. The first detection head is slidably mounted on the detection column and used for axial detection of shaft parts. The second detection head is mounted on the detection platform and used for detecting steps on shaft parts. The detection platform is rotatably provided with a first detection wheel and a second detection wheel. The detection platform is provided with a driving assembly for driving the first and second detection wheels to rotate. The first and second detection wheels are used to place shaft parts and drive the shaft parts to rotate through friction. The detection column is provided with a moving assembly for driving the first detection head to move.

[0007] By adopting the above technical solution, shaft-like parts are placed on the first and second detection wheels, and the first and second detection wheels are driven to rotate by the drive assembly, thereby causing the axial parts to rotate through friction. During this process, the second detection head detects crack defects at the steps of the axial parts during rotation. At the same time, the first detection head is moved by the moving assembly to perform a spiral scanning path on the axial parts, thereby detecting sand holes and microcracks on the surface of the shaft-like parts. This allows for two sets of inspections to be performed simultaneously, reducing labor intensity, saving inspection time, and improving inspection efficiency.

[0008] Preferably, the driving assembly includes a drive motor, a first drive screw, a second drive screw, a first drive block, and a second drive block. The detection table is provided with a drive groove, the drive motor is disposed in the drive groove, the first drive screw and the second drive screw are both rotatably disposed in the drive groove, the drive motor shaft is connected to the first drive screw, the first drive screw is connected to the first detection wheel, the second drive screw is connected to the second detection wheel, the first drive block is slidably disposed in the drive groove and is threaded through by the first drive screw, the second drive block is slidably disposed in the drive groove and is threaded through by the second drive screw, and the first drive block and the second drive block are connected.

[0009] By adopting the above technical solution, the drive motor is started to drive the first drive screw to rotate, thereby driving the first drive block to move in the drive groove, and at the same time driving the first detection wheel to rotate. The movement of the first drive block synchronously drives the second drive block to move, thereby driving the second drive screw to rotate through the thread, so as to drive the second detection wheel to rotate, thus realizing the drive. The operation is convenient and simple, and saves a set of drive components, reducing costs and achieving energy saving and consumption reduction.

[0010] Preferably, a lifting block is slidably disposed in the drive groove, the second detection wheel and the second drive screw are both rotatably disposed on the lifting block, the second drive block is slidably disposed on the lifting block, the second drive block is slidably connected to the first drive block, and a lifting cylinder is disposed in the drive groove, the piston rod of the lifting cylinder is connected to the lifting block.

[0011] By adopting the above technical solution, the lifting cylinder can drive the lifting block to move up and down, thereby adjusting the height of the second detection wheel and changing the size of the gap between the first and second detection wheels. This makes it easier to place shaft parts with different cross-sectional sizes, thus improving the applicability of the detection equipment.

[0012] Preferably, an extension seat is slidably disposed in the drive groove, and a first extension wheel and a second extension wheel are rotatably disposed on the extension seat. The shaft of the second extension wheel is slidably connected to the extension seat. An auxiliary cylinder is disposed on the extension seat, and the piston rod of the auxiliary cylinder is rotatably connected to the shaft of the second extension wheel. The first extension wheel and the second extension wheel are used to place shaft-type parts.

[0013] By adopting the above technical solution, an extension seat is set up, and a first extension wheel and a second extension wheel are rotatably set on the extension seat. The two ends of the shaft part are placed on the two detection wheels and the two extension wheels respectively, which improves the stability of the shaft part rotation. At the same time, the sliding extension seat allows the device to be used for the detection of shaft parts of different lengths, improving its applicability. Simultaneously, the lifting cylinder and the auxiliary cylinder are activated to drive the second detection wheel and the second extension wheel to rise and fall. The operation is simple and convenient, and the device can be easily adjusted to suit shaft parts of different sizes.

[0014] Preferably, an extension screw is rotatably disposed in the drive groove, the extension screw is threaded through the extension seat, and a rotating handwheel is rotatably disposed in the extension seat, the rotating handwheel being connected to the extension screw.

[0015] By adopting the above technical solution, manually pushing the rotating handwheel can rotate the electric extension screw, thereby driving the extension seat to move back and forth. The operation is simple and convenient, and the position of the extension seat can be easily adjusted to suit shaft parts of different lengths.

[0016] Preferably, the detection platform is provided with an auxiliary rod, the auxiliary rod is provided with an auxiliary groove, an auxiliary block is slidably disposed in the auxiliary groove, the second detection head is disposed on the auxiliary block, and a linkage component is provided between the auxiliary block and the lifting block, the linkage component being used to drive the auxiliary block to move according to the lifting of the lifting block.

[0017] By adopting the above technical solution, when the lifting cylinder is activated to adjust the height of the lifting block and the second detection wheel, the auxiliary block is moved up and down through the linkage component, thereby adjusting the height of the second detection head. This ensures that the second detection head is always aligned with the step of the shaft part, eliminating the need for manual adjustment of the height of the second detection head and improving ease of use.

[0018] Preferably, the linkage assembly includes a linkage block and a linkage screw. The linkage screw is rotatably disposed in the drive groove. The linkage screw is inserted into the auxiliary groove and threaded through the auxiliary block. The linkage block is disposed on the lifting block, and the linkage screw is threaded through the linkage block.

[0019] By adopting the above technical solution, when the lifting block moves up and down, it drives the linkage block to move synchronously. The screw drives the connecting screw to rotate, thereby driving the auxiliary block to move up and down, which in turn drives the second detection head to move up and down, thus achieving linkage. The operation is simple and convenient, easy to use, and does not require additional adjustment, reducing labor intensity and improving ease of use.

[0020] Preferably, two sets of auxiliary rods are provided, with the auxiliary rods located on both sides of the first detection wheel. A first auxiliary sprocket and a second auxiliary sprocket are rotatably arranged in the drive groove. The first auxiliary sprocket is connected to one of the connecting screws, and the second auxiliary sprocket is connected to the other connecting screw. An auxiliary chain is meshed on the first auxiliary sprocket and the second auxiliary sprocket.

[0021] By adopting the above technical solution, when one of the connecting screws rotates, it drives the first auxiliary sprocket or the second auxiliary sprocket to rotate, and the transmission is achieved through the auxiliary chain, so that the first auxiliary sprocket and the second auxiliary sprocket rotate synchronously, thereby driving the two sets of second detection heads to move synchronously. The two sets of second detection heads can then perform crack detection on the steps of shaft parts from both sides, improving the comprehensiveness and accuracy of the detection.

[0022] Preferably, the moving component includes a moving lead screw and a moving block, the detection column is provided with a detection rod, the detection rod is provided with a moving groove, the moving lead screw is rotatably disposed in the moving groove, the moving block is slidably disposed in the detection groove, the first detection head is disposed on the moving block, and a transmission component is provided between the moving lead screw and the first driving lead screw, the transmission component being used to drive the moving lead screw to rotate according to the rotation of the first driving lead screw.

[0023] By adopting the above technical solution, when the drive motor starts and drives the first detection wheel and the second detection wheel to rotate, the rotation of the first drive screw drives the moving screw to rotate through the transmission component, thereby driving the moving block to move in the moving groove, thereby driving the first detection head to move for detection. The operation is simple and convenient, and easy to use.

[0024] Preferably, the transmission assembly includes a transmission block and a transmission screw, the transmission screw is rotatably disposed in the moving groove and connected to the moving screw, the transmission block is slidably disposed in the moving groove and is threaded through by the moving screw, and the transmission block is connected to the first drive block.

[0025] By adopting the above technical solution, when the first drive screw rotates and drives the first drive block to move, it synchronously drives the transmission block to move, thereby driving the transmission screw to rotate through the thread, which in turn drives the moving screw to rotate, and the movement of the moving block drives the first detection head to move, thus realizing transmission, saving the cost of drive components, reducing energy consumption during use, and the synchronous transmission of the first detection wheel and the movement of the second detection head does not require additional operation, reducing labor intensity, saving operation time, and improving detection efficiency.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a testing platform, a first testing head, a second testing head, a testing column, a first testing wheel, a second testing wheel, a drive assembly, and a moving assembly, shaft-like parts are placed on the first and second testing wheels of the testing platform. The drive assembly drives the first and second testing wheels to rotate, thereby rotating the shaft-like parts. The second testing head performs crack detection on the steps of the rotating shaft-like parts. At the same time, the moving assembly drives the first testing head to move on the testing column, thereby coordinating with the rotation of the shaft-like parts to perform crack detection on the axial sidewalls of the shaft-like parts. Two sets of inspections are performed simultaneously, saving inspection time and improving inspection efficiency. 2. By setting up a drive groove, a drive motor, a first drive screw, a second drive screw, a first drive block, and a second drive block, the drive motor is started to drive the first drive screw to rotate. While driving the first detection wheel to rotate, it also drives the first drive block to move in the drive groove, thereby driving the second drive block to move. When the threaded second drive block moves, the electric second drive screw rotates, thereby driving the second detection wheel to rotate, thus achieving drive. The operation is simple and convenient, and easy to use. 3. By setting up an extension seat, a first extension wheel, a second extension wheel, an extension screw, and a rotating handwheel, the handwheel is manually rotated, which in turn rotates the extension screw, thereby driving the extension seat to move back and forth. The moving position of the extension seat is determined according to the length of the shaft part to be inspected. One end of the shaft part is placed on the first and second inspection wheels, and the other end of the shaft part is placed on the first and second extension wheels, thereby improving the stability of the shaft part's rotation and thus improving the accuracy of the inspection. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of a shaft crack detection device provided in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram used to illustrate the internal structure of the testing station.

[0029] Explanation of reference numerals in the attached drawings: 1. Detection table; 11. Drive groove; 12. Detection column; 121. Detection rod; 122. Moving groove; 13. First detection wheel; 14. Second detection wheel; 15. First detection head; 16. Second detection head; 2. Drive assembly; 21. Drive motor; 22. First drive screw; 23. Second drive screw; 24. First drive block; 241. Vertical block; 25. Second drive block; 3. Lifting block; 31. Lifting cylinder; 4. Extension seat ; 41. First extension wheel; 42. Second extension wheel; 43. Auxiliary cylinder; 44. Extension screw; 45. Rotating handwheel; 5. Auxiliary rod; 51. Auxiliary groove; 52. Auxiliary block; 6. Linkage assembly; 61. Linkage block; 62. Linkage screw; 621. First auxiliary sprocket; 622. Second auxiliary sprocket; 623. Auxiliary chain; 7. Moving assembly; 71. Moving screw; 72. Moving block; 8. Transmission assembly; 81. Transmission screw; 82. Transmission block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0031] This application discloses a shaft crack detection device. (Refer to...) Figure 1 and Figure 2 The device includes a testing platform 1, a first testing head 15, and two sets of second testing heads 16. A testing column 12 is fixedly mounted on the surface of the testing platform 1, and a testing rod 121, arranged horizontally, is fixedly mounted on the testing column 12. The first testing head 15 is slidably mounted on the testing rod 121 and is used for axial crack detection of shaft parts. The testing rod 121 is equipped with a moving assembly 7, which drives the first testing head 15 to move. A driving groove 11 is provided on the surface of the testing platform 1, and a first testing wheel 13 and a second testing wheel 14 are rotatably mounted within the driving groove 11. The testing platform 1 is equipped with a driving assembly 2, which drives the first testing wheel 13 and the second testing wheel 14 to rotate. The first testing wheel 13 and the second testing wheel 14 are used to place shaft parts and drive them to rotate through friction. The second testing heads 16 are located on both sides of the first testing wheel 13 and are used for crack detection on both sides of the shaft parts. The drive assembly 2 drives the first detection wheel 13 and the second detection wheel 14 to rotate, which in turn drives the placed shaft parts to rotate through friction. At the same time, the first detection head 15 and the second detection head 16 simultaneously detect the axial outer wall and steps of the shaft parts, achieving synchronous detection, saving detection time and improving detection efficiency.

[0032] For ease of use, please refer to Figure 1 and Figure 2The drive assembly 2 includes a drive motor 21, a first drive screw 22, a second drive screw 23, a first drive block 24, and a second drive block 25 (the screw threads are not shown in detail). The first drive screw 22 is rotatably mounted in the drive groove 11 and is coaxially and fixedly connected to the first detection wheel 13. The second drive screw 23 is rotatably mounted in the drive groove 11 and is coaxially and fixedly connected to the second detection wheel 14. The drive motor 21 is mounted in the drive groove 11, and the shaft of the drive motor 21 is coaxially and fixedly connected to the first drive screw 22. The first drive block 24 is slidably mounted in the drive groove 11 and is threaded through by the first drive screw 22. The second drive block 25 is slidably mounted in the drive groove 11 and is threaded through by the second drive screw 23. A vertical block 241 is fixedly mounted on the side wall of the first drive block 24. The second drive block 25 is slidably connected to the vertical block 241, and the sliding direction is perpendicular to the length direction of the first drive screw 22. After the drive motor 21 is started, the first detection wheel 13 is driven to rotate through the first drive screw 22. At the same time, the second drive block 25 is moved through the first drive block 24, and the second drive screw 23 is driven to rotate through the thread, so as to drive the second detection wheel 14 to rotate. The first detection wheel 13 and the second detection wheel 14 rotate synchronously to achieve driving.

[0033] To improve applicability, refer to Figure 1 and Figure 2 A lifting block 3 is slidably mounted vertically within the drive groove 11. The second detection wheel 14 and the second drive screw 23 are rotatably mounted on the lifting block 3, and the second drive block 25 is slidably mounted on the lifting block 3. Two sets of lifting cylinders 31 are installed within the drive groove 11, with the piston rods of the lifting cylinders 31 connected to the bottom wall of the lifting block 3. The lifting cylinders 31 drive the lifting block 3 to move up and down, thereby raising and lowering the second detection wheel 14. This controls the gap between the first detection wheel 13 and the second detection wheel 14, allowing the detection device to be applied to shaft parts of more cross-sectional sizes, thus improving its applicability.

[0034] To further improve applicability, refer to Figure 1 and Figure 2An extension seat 4 is slidably disposed within the drive groove 11. A first extension wheel 41 and a second extension wheel 42 are rotatably disposed on the extension seat 4 via a rotating shaft. The rotating shaft of the second extension wheel 42 is slidably connected to the extension seat 4. The first extension wheel 41 and the second extension wheel 42 are used to hold shaft-like parts. An auxiliary cylinder 43 is fixedly disposed within the extension seat 4. The rotating shaft of the second extension wheel 42 is adapted to pass through the piston rod of the auxiliary cylinder 43 and is rotatably connected to the piston rod of the auxiliary cylinder 43. An extension lead screw 44 (the thread of the lead screw is not shown in detail) is rotatably disposed within the drive groove 11. The extension lead screw 44 is threaded through the extension seat 4. A rotating handwheel 45 is rotatably disposed on the side of the extension seat 4 away from the first rotating wheel. The rotating handwheel 45 is coaxially and fixedly connected to the extension lead screw 44. In another embodiment, a motor can be additionally provided to drive the extension lead screw 44 to rotate, thereby improving the convenience of sliding adjustment of the extension seat 4. By rotating the handwheel 45, the extension screw 44 is rotated, which in turn moves the extension seat 4, adjusting the positions of the first extension wheel 41 and the second extension wheel 42 so that the detection device can be applied to shaft parts of different lengths, thus improving its applicability.

[0035] For ease of use, please refer to Figure 1 and Figure 2 The detection column 12 is fixedly equipped with a detection rod 121 arranged horizontally. The detection rod 121 has a moving groove 122 arranged along its length. The moving assembly 7 includes a moving lead screw 71 and a moving block 72 (the lead screw thread is not shown in detail). The moving lead screw 71 is rotatably disposed within the moving groove 122. The moving block 72 is adapted to slide within the moving groove 122 and is threaded through by the moving lead screw 71. The moving block 72 extends out of the moving groove 122. The first detection head 15 is fixedly disposed on the moving block 72 and is vertically downward. The first detection head 15 can pass directly between the first detection wheel 13 and the second detection wheel 14. A transmission assembly 8 is provided between the moving lead screw 71 and the first drive lead screw 22. The transmission assembly 8 is used to drive the moving lead screw 71 to rotate according to the rotation of the first drive lead screw 22. During use, when the first drive screw 22 rotates and drives the first detection wheel 13 to rotate, the transmission assembly 8 drives the moving screw 71 to rotate, thereby driving the moving block 72 to move, so that the first detection head 15 moves to perform detection while the shaft part rotates, simplifying operation and making it convenient to use.

[0036] For ease of use, please refer to Figure 1 and Figure 2The transmission assembly 8 includes a transmission block 82 and an L-shaped transmission screw 81 (the screw thread is not shown in detail). The transmission screw 81 is rotatably mounted in the moving groove 122 and is coaxially and fixedly connected to the moving screw 71. The transmission block 82 is adapted to slide within the moving groove 122 and is threaded through by the moving screw 71. The first drive block 24 extends out of the drive groove 11 and is fixedly connected to the transmission block 82. The transmission block 82 moves with the first drive block 24 and drives the transmission screw 81 to rotate through the thread, thereby driving the moving screw 71 to rotate synchronously, realizing transmission. The operation is simple and convenient.

[0037] For ease of adjustment, refer to Figure 1 and Figure 2 Two sets of auxiliary rods 5 are fixedly installed on the surface of the detection table 1. The auxiliary rods 5 are located on both sides of the first detection wheel 13. An auxiliary groove 51 is vertically rectangularly arranged on the side wall of the auxiliary rod 5 near the first detection wheel 13. An auxiliary block 52 is slidably installed within the auxiliary groove 51, extending out of the auxiliary groove 51. The second probe is fixedly installed on the auxiliary block 52 and faces the gap between the first detection wheel 13 and the second detection wheel 14. A linkage component 6 is provided between the auxiliary block 52 and the lifting block 3. The linkage component 6 is used to move the auxiliary block 52 according to the lifting of the lifting block 3. In other embodiments, the linkage component 6 may not be provided, and a motor slider or cylinder structure may be additionally provided to move the auxiliary block 52 to adjust the height of the second probe 16 independently. When the lifting block 3 is raised and lowered to adjust the position of the second detection wheel 14, the linkage component 6 moves the auxiliary block 52 to adjust the height of the second probe 16, ensuring that the height of the second probe 16 is always located at the protruding step of the shaft-like part for easy adjustment.

[0038] For ease of use, please refer to Figure 1 and Figure 2 The linkage assembly 6 includes a linkage block 61 and a pair of linkage screws 62 (the screw threads are not shown in detail). The linkage screws 62 are rotatably mounted inside the detection table 1. The linkage screws 62 are rotatably inserted into the auxiliary groove 51 and threaded through the auxiliary block 52. The linkage block 61 is fixedly mounted on the side wall of the lifting block 3 and threaded through by the linkage screws 62. A first auxiliary sprocket 621 and a second auxiliary sprocket 622 are rotatably mounted inside the detection table 1. The first auxiliary sprocket 621 and the second auxiliary sprocket 622 are respectively sleeved on a linkage screw 62. An auxiliary chain 623 is meshed on the first auxiliary sprocket 621 and the second auxiliary sprocket 622. When the lifting block 3 moves, it drives the linkage block 61 to move, and drives the linkage screws 62 to rotate through the threads. The two linkage screws 62 are driven by a chain and sprocket, rotating synchronously, thereby driving the auxiliary block 52 to move up and down to adjust the height of the second detection head 16. The operation is simple and convenient, and easy to use.

[0039] The implementation principle of the shaft crack detection device in this application embodiment is as follows: The shaft part is placed on the detection table 1, with one end of the shaft part located between the first detection wheel 13 and the second detection wheel 14, and the other end of the shaft part located between the first extension wheel 41 and the second extension wheel 42. Then, the first detection wheel 13 and the second detection wheel 14 are driven to rotate synchronously by the drive assembly 2, and the shaft part is rotated by friction. During this process, when the first drive screw 22 in the drive assembly 2 rotates, it drives the transmission screw 81 to rotate through the first drive block 24 and the transmission block 82, so as to drive the moving screw 71 to rotate. The moving block 72 drives the first detection head 15 to move over the rotating shaft part to complete the axial crack detection. At the same time, the second detection head 16 detects the protruding stage of the shaft part from both sides, and completes two sets of detections simultaneously, reducing the labor intensity of detection and saving detection time to improve detection efficiency.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A shaft crack detection device, characterized in that: The device includes a testing platform (1), a first testing head (15), and a second testing head (16). The testing platform (1) is provided with a testing column (12). The first testing head (15) is slidably disposed on the testing column (12) and used for axial testing of shaft parts. The second testing head (16) is disposed on the testing platform (1) and used for testing the steps of shaft parts. The testing platform (1) is rotatably provided with a first testing wheel (13) and a second testing wheel (14). The testing platform (1) is provided with a driving assembly (2). The driving assembly (2) is used to drive the first testing wheel (13) and the second testing wheel (14) to rotate. The first testing wheel (13) and the second testing wheel (14) are used to place shaft parts and drive the shaft parts to rotate through friction. The testing column (12) is provided with a moving assembly (7). The moving assembly (7) is used to drive the first testing head (15) to move.

2. The shaft crack detection device according to claim 1, characterized in that: The drive assembly (2) includes a drive motor (21), a first drive screw (22), a second drive screw (23), a first drive block (24), and a second drive block (25). The detection table (1) is provided with a drive groove (11). The drive motor (21) is disposed in the drive groove (11). The first drive screw (22) and the second drive screw (23) are both rotatably disposed in the drive groove (11). The shaft of the drive motor (21) is connected to the first drive screw (22). The first drive screw (22) is connected to the first detection wheel (13). The second drive screw (23) is connected to the second detection wheel (14). The first drive block (24) is slidably disposed in the drive groove (11) and is threaded through by the first drive screw (22). The second drive block (25) is slidably disposed in the drive groove (11) and is threaded through by the second drive screw (23). The first drive block (24) and the second drive block (25) are connected.

3. The shaft crack detection device according to claim 2, characterized in that: A lifting block (3) is slidably disposed in the drive groove (11). The second detection wheel (14) and the second drive screw (23) are rotatably disposed on the lifting block (3). The second drive block (25) is slidably disposed on the lifting block (3). The second drive block (25) is slidably connected to the first drive block (24). A lifting cylinder (31) is disposed in the drive groove (11). The piston rod of the lifting cylinder (31) is connected to the lifting block (3).

4. The shaft crack detection device according to claim 3, characterized in that: An extension seat (4) is slidably disposed in the drive groove (11). The extension seat (4) is rotatably disposed with a first extension wheel (41) and a second extension wheel (42). The shaft of the second extension wheel (42) is slidably connected to the extension seat (4). The extension seat (4) is provided with an auxiliary cylinder (43). The piston rod of the auxiliary cylinder (43) is rotatably connected to the shaft of the second extension wheel (42). The first extension wheel (41) and the second extension wheel (42) are used to place shaft parts.

5. The shaft crack detection device according to claim 4, characterized in that: An extension screw (44) is rotatably disposed in the drive groove (11). The extension screw (44) is threaded through the extension seat (4). A rotating handwheel (45) is rotatably disposed in the extension seat (4). The rotating handwheel (45) is connected to the extension screw (44).

6. The shaft crack detection device according to claim 3, characterized in that: The testing platform (1) is provided with an auxiliary rod (5), the auxiliary rod (5) is provided with an auxiliary groove (51), an auxiliary block (52) is slidably arranged in the auxiliary groove (51), the second testing head (16) is arranged on the auxiliary block (52), and a linkage component (6) is provided between the auxiliary block (52) and the lifting block (3). The linkage component (6) is used to drive the auxiliary block (52) to move according to the lifting of the lifting block (3).

7. The shaft crack detection device according to claim 6, characterized in that: The linkage assembly (6) includes a linkage block (61) and a linkage screw (62). The linkage screw (62) is rotatably disposed in the drive groove (11). The linkage screw (62) is inserted into the auxiliary groove (51) and threaded through the auxiliary block (52). The linkage block (61) is disposed on the lifting block (3). The linkage screw (62) is threaded through the linkage block (61).

8. The shaft crack detection device according to claim 7, characterized in that: Two sets of auxiliary rods (5) are provided. The auxiliary rods (5) are located on both sides of the first detection wheel (13). A first auxiliary sprocket (621) and a second auxiliary sprocket (622) are rotatably arranged in the drive groove (11). The first auxiliary sprocket (621) is connected to one of the connecting screws (62), and the second auxiliary sprocket (622) is connected to the other connecting screw (62). An auxiliary chain (623) is meshed on the first auxiliary sprocket (621) and the second auxiliary sprocket (622).

9. A shaft crack detection device according to claim 2, characterized in that: The moving component (7) includes a moving lead screw (71) and a moving block (72). The detection column (12) is provided with a detection rod (121). The detection rod (121) is provided with a moving groove (122). The moving lead screw (71) is rotatably disposed in the moving groove (122). The moving block (72) is slidably disposed in the detection groove. The first detection head (15) is disposed on the moving block (72). A transmission component (8) is provided between the moving lead screw (71) and the first driving lead screw (22). The transmission component (8) is used to drive the moving lead screw (71) to rotate according to the rotation of the first driving lead screw (22).

10. A shaft crack detection device according to claim 9, characterized in that: The transmission assembly (8) includes a transmission block (82) and a transmission screw (81). The transmission screw (81) is rotatably disposed in the moving groove (122) and connected to the moving screw (71). The transmission block (82) is slidably disposed in the moving groove (122) and threaded through by the moving screw (71). The transmission block (82) is connected to the first drive block (24).

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