A crack detection device and method based on the structure of automotive gears

Abstract

The present invention belongs to the technical field of automotive gears, and in particular, relates to a crack detection device and method based on the structure of automotive gears. Aiming at the difficulty in adapting to the surface changes of gears and maintaining the detection angle and distance, the following solution is proposed. It includes a workbench, on the top of which a crack observation display is fixedly connected. A support base is fixedly connected to the top of the workbench, and a connecting frame is fixedly connected to the top of the support base. An automatic rotating base is movably connected to the top of the workbench, and a support frame is fixedly connected to the top of the automatic rotating base. A gear body is arranged on the top of the support frame, and a surface detection component is arranged inside the gear body. The disclosed crack detection device and method based on the structure of automotive gears of the present invention have the effects of being able to comprehensively scan the outer surface of the gear, avoiding detection dead angles, ensuring that no cracks are missed, enabling the syringe camera to adapt to the shape changes of the gear surface, and always maintaining an appropriate detection angle and distance, thereby improving the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive gears, and in particular to a crack detection device and method based on the structure of automotive gears. Background Art

[0002] The automotive gear structure mainly includes a planetary gear mechanism and a transmission gear mechanism. These structures play a crucial role in the automotive transmission system. By different fixing or constraining methods, various transmission ratios can be achieved to meet different power requirements. Their application in automobiles not only improves the operation convenience and comfort but also enhances the vehicle's passability and the flexibility of power distribution.

[0003] Existing devices can only detect partial areas of the automotive gear structure, prone to detection dead angles, very likely to miss some cracks, unable to adapt to the shape changes of the gear surface, and difficult to maintain appropriate detection angles and distances, thus reducing the detection accuracy. Summary of the Invention

[0004] The present invention discloses a crack detection device and method based on the structure of automotive gears, aiming to solve the technical problems of low flushing treatment efficiency and easy damage to the device in the background art.

[0005] A crack detection device based on the structure of automotive gears proposed by the present invention includes a workbench. A crack observation display is fixedly connected to the top end of the workbench. A support base is fixedly connected to the top end of the workbench. A connecting frame is fixedly connected to the top end of the support base. An automatic rotating base is movably connected to the top end of the workbench, and a support frame is fixedly connected to the top end of the automatic rotating base. A gear body is arranged at the top end of the support frame. A surface detection component is arranged inside the gear body, and a crack detection component is arranged outside the gear body;

[0006] The crack detection component includes a syringe camera. The syringe camera is located outside the gear body, and a connector is fixedly connected to the bottom end of the syringe camera;

[0007] The surface detection component includes symmetric arc-shaped support plates. The outer sides of the arc-shaped support plates are in contact with the inner side of the gear body. Symmetric detection heads are arranged on the opposite sides of the arc-shaped support plates, and the detection heads are all located above the gear body.

[0008] In a preferred embodiment, the crack detection assembly further includes a driving motor. The power output shaft of the driving motor is connected to a rotating rod through a coupling. A bracket is fixedly connected to the outer side of the top end of the rotating rod. A limiting ring frame is arranged on the outer side of the bracket. A telescopic driving rod is fixedly connected to the bottom end of the limiting ring frame. A telescopic rod is fixedly connected to the bottom end of the side of the limiting ring frame away from the telescopic driving rod. A compression spring is arranged on the outer side of the telescopic rod. The top end of the compression spring is fixedly connected to the bottom end of the limiting ring frame. A base is fixedly connected to the top end of the bracket. A movable rod is movably connected to the inner side of the base. One end of the movable rod close to the telescopic rod is movably connected to a mounting member. The bottom end of the mounting member is fixedly connected to the top end of the bracket. A U-shaped frame is fixedly connected to the outer side of the movable rod. The top end of the U-shaped frame is fixedly connected to the bottom end of the connector. A fixed shaft is fixedly connected to the outer side of the end of the movable rod away from the mounting member. An L-shaped rod is fixedly connected to the bottom end of the fixed shaft. A roller is movably connected to the outer side of one end of the L-shaped rod. An annular chute is formed in the inner side of the limiting ring frame. The roller is located outside the annular chute.

[0009] When detecting cracks on the outer side of an automotive gear through the crack detection assembly, the syringe camera is located outside the gear body. When the driving motor starts, it drives the rotating rod to rotate. When the rotating rod rotates, the bracket also rotates accordingly, driving the syringe camera to adjust the angle of the gear body. The fixed shaft fixed to one end of the movable rod drives the L-shaped rod and the roller to move. The roller rolls in the annular chute inside the limiting ring frame. Since the roller is in the annular chute, the movement track of the movable rod can be restricted. The telescopic driving rod can be extended or shortened as needed. When it extends, it will push the limiting ring frame, and then through the compression spring, etc., the syringe camera can adjust the angle according to the shape of the outer tooth grooves of the gear body when approaching the gear body, so as to more clearly detect the crack situation on the gear surface; when it shortens, it will pull the limiting ring frame, making the syringe camera and the like move away from the gear body. When the telescopic driving rod acts or the gear surface is uneven, causing the syringe camera to be subjected to an external force, the compression spring plays a buffering and adjusting role. When the syringe camera is subjected to an outward force, the compression spring compresses, and the movable rod will move a certain distance away from the gear; when the external force disappears, the compression spring returns to its original shape, making the syringe camera return to the appropriate detection position. During the process, the outer surface of the gear can be scanned comprehensively, avoiding detection dead angles, ensuring that no cracks are missed, enabling the syringe camera to adapt to the shape change of the gear surface, and always maintaining an appropriate detection angle and distance, thereby improving the detection accuracy.

[0010] In a preferred embodiment, a fixing frame is fixedly connected to the bottom end of the driving motor. The bottom ends of the telescopic driving rod, the telescopic rod and the compression spring are all fixedly connected to the top end of the fixing frame. Symmetric connecting round rods are fixedly connected to the inner side of the fixing frame. Sliding frames are fixedly connected to both ends of the two connecting round rods. A connecting rod is movably connected to the inner side of the rear end of the sliding frame. The top end of the connecting rod is fixedly connected to the inner side of the top end of the connecting frame, and the bottom end of the connecting rod is fixedly connected to the top end of the support base. A fixing seat is fixedly connected to the top end of the connecting frame. A rotating rod is movably connected to the inner side of the fixing seat. Rotating shafts are fixedly connected to the outer sides of both ends of the rotating rod. A rotating motor is connected to one end of the rotating rod close to the crack observation display through a coupling. Pulling ropes are movably connected to the outer sides of the rotating shafts. Symmetric round holes are formed in the connecting frame, and the pulling ropes are movably connected between the round holes. The bottom end of the pulling rope is fixedly connected to the top end of the sliding frame. The pulling ropes are located on both sides of the connecting round rod.

[0011] In a preferred embodiment, the surface detection assembly further includes a mounting frame. The bottom end of the mounting frame is fixedly connected to the top end of the support frame. An upper and lower connecting member is fixedly connected to the top end of the mounting frame. The upper and lower connecting member is located between the inner sides of the gear body. A bidirectional telescopic electric rod is fixedly connected to the inner side of the upper and lower connecting member. Connecting plates are fixedly connected to both ends of the bidirectional telescopic electric rod. Buffer springs are fixedly connected to the opposite sides of the connecting plates. The buffer springs are fixedly connected to the opposite sides of the arc-shaped support plates away from the connecting plates. An upper plate is fixedly connected to the top end of the upper and lower connecting member. A bidirectional servo motor is fixedly connected to the top end of the upper plate. Power output heads at both ends of the bidirectional servo motor are connected to rotating threaded rods through couplings. Limiting frames are movably connected to the outer sides of the rotating threaded rods. Symmetric auxiliary round rods are fixedly connected to the inner sides of the limiting frames. Sliding members are movably connected to the outer sides of the auxiliary round rods and the rotating threaded rods. The top ends of the sliding members are fixedly connected to the bottom ends of the detection heads.

[0012] By setting up a surface detection component, when detecting the surface of the automotive gear, the bidirectional telescopic electric rod starts to work. According to the size of the gear body, its two ends extend or shorten. When extending, it pushes the connecting plates at both ends, and the connecting plates then push the arc-shaped support plate away from the upper and lower connectors through the buffer springs, making the arc-shaped support plate fit more closely to the inner side of the gear body, playing a role in stable support and positioning. When shortening, it pulls the connecting plates, making the arc-shaped support plate close to the upper and lower connectors, which can adapt to gears of different sizes. During the operation of the bidirectional telescopic electric rod, the buffer springs play a role in buffering and adjusting. When the arc-shaped support plate is subjected to a large external force, the buffer springs are compressed to prevent the arc-shaped support plate from damaging the inner side of the gear body; when the external force disappears, the buffer springs return to their original shape, making the arc-shaped support plate return to the appropriate position. The bidirectional servo motor starts, and both ends drive the rotating threaded rod to rotate. The rotation of the rotating threaded rod causes the sliding part to move on the auxiliary round rod and the rotating threaded rod. The movement of the sliding part drives the detection head to move horizontally above the gear body. By the forward and reverse rotation of the bidirectional servo motor, the detection head can perform reciprocating motion above the gear body, thereby comprehensively detecting the surface of the gear. The auxiliary round rod provides stable guidance for the sliding part, ensuring that the sliding part does not shift or shake during the movement, enabling the detection head to move smoothly along a straight track, improving the accuracy and reliability of the detection. During the process, the surface of the gear can be fully covered to achieve non-blind-spot detection, ensuring that various defects on the gear surface can be discovered.

[0013] A usage method of a crack detection device based on the structure of an automotive gear. Using a crack detection device based on the structure of an automotive gear as described above, it includes the following steps:

[0014] Step 1: Place the automotive gear to be detected on the top of the support frame on the automatic rotating seat, ensure that the gear body is in a stable state, start the crack observation display, the surface detection component, and the crack detection component, and check whether each component is working properly, such as checking whether the syringe camera can take normal pictures and whether the detection head can collect data normally, etc.;

[0015] Step 2: Start the surface detection component, push the arc-shaped support plate into contact with the inner side of the gear body, the detection head is located above the gear, and the detection head scans along the surface of the gear to collect the image and data information on the surface of the gear to detect whether there are defects such as cracks on the surface of the gear;

[0016] Step 3: Start the automatic rotating seat to drive the gear body to rotate slowly. At the same time, by adjusting the position and angle of the syringe camera, make it able to aim at the outer side of the gear body. The syringe camera takes pictures of the outer side of the gear and transmits the taken images to the crack observation display. The operator judges whether there are cracks on the outer side of the gear by observing the images on the display.

[0017] As can be seen from the above, a crack detection device based on the structure of an automotive gear provided by the present invention has the effect of being able to comprehensively scan the outer surface of the gear, avoiding detection dead angles, ensuring that no cracks are missed, enabling the syringe camera to adapt to the shape changes of the gear surface, and always maintaining an appropriate detection angle and distance, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0019] Figure 2 FIG. is a schematic diagram of the structure above the workbench of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0020] Figure 3 FIG. is a schematic diagram of the inner structure of the gear of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0021] Figure 4 FIG. is a schematic diagram of the structure above the bracket of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0022] Figure 5 FIG. is a schematic diagram of the structure of the crack detection component of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0023] Figure 6 FIG. is a partial structure schematic diagram of the crack detection component of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0024] Figure 7 FIG. is a schematic diagram of the structure of the surface detection component of a crack detection device based on the structure of an automotive gear proposed by the present invention;

[0025] Figure 8 FIG. is a partial structure schematic diagram of the surface detection component of a crack detection device based on the structure of an automotive gear proposed by the present invention.

[0026] In the figure: 1. Workbench; 2. Crack observation display; 3. Bracket; 4. Automatic rotating seat; 5. Support frame; 6. Gear body; 7. Surface detection component; 701. Mounting frame; 702. Upper and lower connecting parts; 703. Bidirectional telescopic electric rod; 704. Connecting plate; 705. Buffer spring; 706. Arc-shaped support plate; 707. Upper plate; 708. Bidirectional servo motor; 709. Rotating threaded rod; 710. Limit frame; 711. Auxiliary round rod; 712. Sliding part; 713. Detection head; 8. Connecting frame; 9. Crack detection component; 901. Driving motor; 902. Rotating rod; 903. Bracket; 904. Telescopic driving rod; 905. Compression spring; 906. Telescopic rod; 907. Limit ring frame; 908. Base; 909. Mounting part; 910. Movable rod; 911. U-shaped frame; 912. Fixed shaft; 913. L-shaped rod; 914. Roller; 915. Connector; 916. Syringe camera; 10. Sliding frame; 11. Connecting rod; 12. Fixed seat; 13. Rotating rod; 14. Rotating shaft; 15. Rotating motor; 16. Pulling rope; 17. Fixed frame; 18. Connecting round rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] A crack detection device based on an automotive gear structure disclosed by the present invention is mainly applied to scenarios where only the outer part of the gear can be detected, dead corners are easily present, cracks are easily missed, the syringe camera cannot adapt to the surface changes of the gear, it is difficult to maintain the detection angle and distance, and the detection accuracy is reduced.

[0029] Referring to Figure 1-8 , a crack detection device based on an automotive gear structure includes a workbench 1. A crack observation display 2 is fixedly connected to the top end of the workbench 1. A bracket 3 is fixedly connected to the top end of the workbench 1. A connecting frame 8 is fixedly connected to the top end of the bracket 3. An automatic rotating seat 4 is movably connected to the top end of the workbench 1. And a support frame 5 is fixedly connected to the top end of the automatic rotating seat 4. A gear body 6 is arranged at the top end of the support frame 5. A surface detection component 7 is arranged inside the gear body 6. A crack detection component 9 is arranged outside the gear body 6;

[0030] The crack detection component 9 includes a syringe camera 916. The syringe camera 916 is located outside the gear body 6. And a connector 915 is fixedly connected to the bottom end of the syringe camera 916;

[0031] The surface detection assembly 7 includes symmetric arc-shaped support plates 706. The outer sides of the arc-shaped support plates 706 are in contact with the inner sides of the gear body 6. Symmetric detection heads 713 are provided on the opposite sides of the arc-shaped support plates 706, and the detection heads 713 are all located above the gear body 6.

[0032] Refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 , the crack detection assembly 9 further includes a driving motor 901. The power output shaft of the driving motor 901 is connected to a rotating rod 902 through a coupling. A bracket 903 is fixedly connected to the outer side of the top end of the rotating rod 902. A limiting ring frame 907 is provided on the outer side of the bracket 903. A telescopic driving rod 904 is fixedly connected to the bottom end of the limiting ring frame 907. A telescopic rod 906 is fixedly connected to the bottom end of the side of the limiting ring frame 907 away from the telescopic driving rod 904. A compression spring 905 is provided on the outer side of the telescopic rod 906. The top end of the compression spring 905 is fixedly connected to the bottom end of the limiting ring frame 907. A base 908 is fixedly connected to the top end of the bracket 903. A movable rod 910 is movably connected to the inner side of the base 908. One end of the movable rod 910 close to the telescopic rod 906 is movably connected to a mounting member 909. The bottom end of the mounting member 909 is fixedly connected to the top end of the bracket 903. A U-shaped frame 911 is fixedly connected to the outer side of the movable rod 910. The top end of the U-shaped frame 911 is fixedly connected to the bottom end of the connector 915. A fixed shaft 912 is fixedly connected to the outer side of the end of the movable rod 910 away from the mounting member 909. An L-shaped rod 913 is fixedly connected to the bottom end of the fixed shaft 912. A roller 914 is movably connected to the outer side of one end of the L-shaped rod 913. An annular chute is formed in the inner side of the limiting ring frame 907. The roller 914 is located outside the annular chute.

[0033] Specifically, when detecting cracks on the outer side of an automotive gear, the syringe camera 916 is located outside the gear body 6. The driving motor 901 is started to drive the rotating rod 902 and the bracket 903 to rotate, adjusting the angle of the syringe camera 916. The roller 914 at one end of the movable rod 910 rolls in the annular chute of the limiting ring frame 907, restricting the trajectory of the movable rod 910. The telescopic driving rod 904 expands and contracts as needed. When it extends, it pushes the syringe camera 916 closer to the gear and adjusts the angle according to the tooth grooves, facilitating the detection of cracks; when it shortens, it pulls the syringe camera 916 away. During the expansion and contraction, the compression spring 905 buffers and adjusts. When compressed by an external force, it makes the movable rod 910 move away from the gear, and when the external force disappears, it returns to its original position.

[0034] Refer to Figure 1 , Figure 2 and Figure 3, in a preferred embodiment, a fixed frame 17 is fixedly connected to the bottom end of the drive motor 901. The bottom ends of the telescopic drive rod 904, the telescopic rod 906, and the compression spring 905 are all fixedly connected to the top end of the fixed frame 17. Symmetric connecting round rods 18 are fixedly connected to the inner side of the fixed frame 17. Sliding frames 10 are fixedly connected to both ends of the two connecting round rods 18. A connecting rod 11 is movably connected to the inner side of the rear end of the sliding frame 10. The top end of the connecting rod 11 is fixedly connected to the inner side of the top end of the connecting frame 8, and the bottom end of the connecting rod 11 is fixedly connected to the top end of the support base 3. A fixed seat 12 is fixedly connected to the top end of the connecting frame 8. A rotating rod 13 is movably connected to the inner side of the fixed seat 12. Rotating shafts 14 are fixedly connected to the outer sides of both ends of the rotating rod 13. A rotating motor 15 is connected to one end of the rotating rod 13 close to the crack observation display 2 through a coupling. Pulling ropes 16 are movably connected to the outer sides of the rotating shafts 14. Symmetric round holes are formed in the connecting frame 8, and the pulling ropes 16 are movably connected between the round holes. The bottom end of the pulling rope 16 is fixedly connected to the top end of the sliding frame 10. The pulling ropes 16 are located on both sides of the connecting round rod 18.

[0035] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 , the surface detection assembly 7 further includes a mounting frame 701. The bottom end of the mounting frame 701 is fixedly connected to the top end of the support frame 5. An up-and-down connecting member 702 is fixedly connected to the top end of the mounting frame 701. The up-and-down connecting member 702 is located between the inner sides of the gear body 6. A bidirectional telescopic electric rod 703 is fixedly connected to the inner side of the up-and-down connecting member 702. Connecting plates 704 are fixedly connected to both ends of the bidirectional telescopic electric rod 703. Buffer springs 705 are fixedly connected to the opposite sides of the connecting plates 704. The buffer springs 705 are fixedly connected to the opposite sides of the arc-shaped support plates 706 away from the connecting plates 704. An upper plate 707 is fixedly connected to the top end of the up-and-down connecting member 702. A bidirectional servo motor 708 is fixedly connected to the top end of the upper plate 707. Rotating threaded rods 709 are connected to the power output heads at both ends of the bidirectional servo motor 708 through couplings. Limit frames 710 are movably connected to the outer sides of the rotating threaded rods 709. Symmetric auxiliary round rods 711 are fixedly connected to the inner sides of the limit frames 710. Sliding members 712 are movably connected to the outer sides of the auxiliary round rods 711 and the rotating threaded rods 709. The top ends of the sliding members 712 are fixedly connected to the bottom ends of the detection heads 713.

[0036] Specifically, when detecting the surface of an automotive gear, the bidirectional telescopic electric rod 703 expands and contracts according to the gear size. When it extends, it pushes the connecting plate 704 through the buffer spring 705 to make the arc-shaped support plate 706 fit the inner side of the gear body 6, playing a role in stable support and positioning. When it shortens, it pulls the connecting plate 704 to make the arc-shaped support plate 706 approach the connecting piece to adapt to different gears. During the movement, the buffer spring 705 buffers and adjusts, compressing to prevent damage when subjected to external forces and restoring when the external forces disappear. The bidirectional servo motor 708 is started to drive the rotating threaded rod 709 to rotate, causing the sliding part 712 to move on the auxiliary round rod 711 and the rotating threaded rod 709, thereby driving the detection head 713 to move horizontally. Forward and reverse rotations achieve reciprocating motion to comprehensively detect the gear surface. The auxiliary round rod 711 guides the sliding part 712 to ensure the smooth linear movement of the detection head 713, improving the detection accuracy and reliability.

[0037] A method for using a crack detection device based on the structure of an automotive gear, using a crack detection device based on the structure of an automotive gear as described above, includes the following steps:

[0038] Step 1: Place the automotive gear to be detected on the top of the support frame 5 on the automatic rotating base 4, ensure that the gear body 6 is in a stable state, start the crack observation display 2, the surface detection component 7, and the crack detection component 9, and check whether each component is working properly, such as checking whether the syringe camera 916 can take normal pictures and whether the detection head 713 can collect data normally, etc.;

[0039] Step 2: Start the surface detection component 7, push the arc-shaped support plate 706 into contact with the inner side of the gear body 6, the detection head 713 is located above the gear, and the detection head 713 scans along the gear surface to collect the image and data information of the gear surface to detect whether there are defects such as cracks on the gear surface;

[0040] Step 3: Start the automatic rotating base 4 to drive the gear body 6 to rotate slowly. At the same time, by adjusting the position and angle of the syringe camera 916, make it able to align with the outer side of the gear body 6. The syringe camera 916 takes pictures of the outer side of the gear and transmits the taken images to the crack observation display 2. The operator judges whether there are cracks on the outer side of the gear by observing the images on the display.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A crack detection device based on an automobile gear structure, comprising a workbench (1), characterized in that: The top of the workbench (1) is fixedly connected to a crack observation display (2), the top of the workbench (1) is fixedly connected to a bracket (3), the top of the bracket (3) is fixedly connected to a connecting frame (8), the top of the workbench (1) is movably connected to an automatic rotating seat (4), and the top of the automatic rotating seat (4) is fixedly connected to a supporting frame (5), the top of the supporting frame (5) is provided with a gear body (6), the inner side of the gear body (6) is provided with a surface detection component (7), and the outer side of the gear body (6) is provided with a crack detection component (9); The crack detection assembly (9) comprises a pinhole camera (916), the pinhole camera (916) is located outside the gear body (6), and the bottom end of the pinhole camera (916) is fixedly connected to a connector (915); The surface detection assembly (7) comprises a symmetrical arc-shaped support plate (706), the outer side of the arc-shaped support plate (706) contacts the inner side of the gear body (6), and symmetrical detection heads (713) are arranged on the opposite side of the arc-shaped support plate (706), and the detection heads (713) are all located above the gear body (6); The crack detection assembly (9) further comprises a driving motor (901), wherein the power output shaft of the driving motor (901) is connected to a rotating rod (902) via a coupling, the top outer side of the rotating rod (902) is fixedly connected to a bracket (903), and a limit ring frame (907) is arranged on the outer side of the bracket (903), the bottom end of the limit ring frame (907) is fixedly connected to a telescopic driving rod (904), and the bottom end of the limit ring frame (907) away from the telescopic driving rod (904) is fixedly connected to a telescopic rod (906); a compression spring (905) is arranged on the outer side of the telescopic rod (906), the top end of the compression spring (905) is fixedly connected to the bottom end of the limit ring frame (907), the top end of the bracket (903) is fixedly connected to a base (908), and the base (908) is fixedly connected to the bottom end of the limit ring frame (908). A movable rod (910) is movably connected to the inner side, and one end of the movable rod (910) close to the telescopic rod (906) is movably connected to a mounting member (909), and the bottom end of the mounting member (909) is fixedly connected to the top end of the bracket (903); the outer side of the movable rod (910) is fixedly connected to a U-shaped frame (911), and the top end of the U-shaped frame (911) is fixedly connected to the bottom end of the connector (915); the outer side of one end of the movable rod (910) away from the mounting member (909) is fixedly connected to a fixed shaft (912), and the bottom end of the fixed shaft (912) is fixedly connected to an L-shaped rod (913); one end of the L-shaped rod (913) is movably connected to a roller (914) on the outer side; an annular groove is provided on the inner side of the limiting ring frame (907), and the roller (914) is located on the outer side of the annular groove.

2. A crack detection device based on an automobile gear structure according to claim 1, characterized in that: The bottom end of the driving motor (901) is fixedly connected to a fixing frame (17), the bottom ends of the telescopic driving rod (904), the telescopic rod (906) and the compression spring (905) are all fixedly connected to the top end of the fixing frame (17), and a symmetrical connecting round rod (18) is fixedly connected to the inner side of the fixing frame (17).

3. A crack detection device based on an automobile gear structure according to claim 2, characterized in that: Both ends of the two connecting round rods (18) are fixedly connected to a sliding frame (10), the inner side of the rear end of the sliding frame (10) is movably connected to a connecting rod (11), the top end of the connecting rod (11) is fixedly connected to the inner side of the top end of the connecting frame (8), and the bottom end of the connecting rod (11) is fixedly connected to the top end of the bracket (3), the top end of the connecting frame (8) is fixedly connected to a fixed seat (12), the inner side of the fixed seat (12) is movably connected to a rotating rod (13), and the outer sides of both ends of the rotating rod (13) are fixedly connected to rotating shafts (14).

4. The crack detection device based on the automobile gear structure according to claim 3 is characterized in that: The end of the rotating rod (13) close to the crack observation display (2) is connected to a rotating motor (15) through a coupling, and the outer side of the rotating shaft (14) is movably connected to a pulling rope (16). Symmetrical circular holes are opened on the connecting frame (8), and the pulling rope (16) is movably connected inside the circular holes. The bottom end of the pulling rope (16) is fixedly connected to the top end of the sliding frame (10), and the pulling rope (16) is located on both sides of the connecting round rod (18).

5. A crack detection device based on an automobile gear structure according to claim 4, characterized in that: The surface detection assembly (7) further comprises a mounting frame (701), wherein the bottom end of the mounting frame (701) is fixedly connected to the top end of the support frame (5), the top end of the mounting frame (701) is fixedly connected to an upper and lower connecting member (702), the upper and lower connecting members (702) are located between the inner sides of the gear body (6), and the inner sides of the upper and lower connecting members (702) are fixedly connected to a bidirectional telescopic electric rod (703), both ends of the bidirectional telescopic electric rod (703) are fixedly connected to a connecting plate (704), the opposite side of the connecting plate (704) is fixedly connected to a buffer spring (705), and the side of the buffer spring (705) away from the connecting plate (704) is fixedly connected to the side opposite to the arc-shaped support plate (706).

6. A crack detection device based on an automobile gear structure according to claim 5, characterized in that: The top ends of the upper and lower connecting members (702) are fixedly connected to an upper plate (707), the top ends of the upper plate (707) are fixedly connected to a bidirectional servo motor (708), the power output heads at both ends of the bidirectional servo motor (708) are connected to a rotating threaded rod (709) via a coupling, and the outer sides of the rotating threaded rod (709) are movably connected to a limit frame (710), the inner sides of the limit frames (710) are fixedly connected to symmetrical auxiliary round rods (711), the outer sides of the auxiliary round rods (711) and the rotating threaded rods (709) are movably connected to a sliding member (712), and the top end of the sliding member (712) is fixedly connected to the bottom end of the detection head (713).

7. A method for using a crack detection device based on an automobile gear structure, using the crack detection device based on an automobile gear structure according to claim 6, characterized in that: The steps include: Step 1: Place the automobile gear to be inspected on the top of the support frame (5) on the automatic rotating seat (4), ensure that the gear body (6) is in a stable state, start the crack observation display (2), the surface detection component (7) and the crack detection component (9), and check whether each component is working normally, such as checking whether the needle tube camera (916) can take pictures normally and whether the detection head (713) can collect data normally; Step 2: Start the surface detection component (7), push the arc-shaped support plate (706) to contact the inner side of the gear body (6), and position the detection head (713) above the gear. The detection head (713) scans along the surface of the gear to collect images and data information of the surface of the gear to detect whether there are crack defects on the surface of the gear; Step 3: Start the automatic rotating seat (4) to drive the gear body (6) to rotate slowly. At the same time, adjust the position and angle of the needle tube camera (916) so that it can be aligned with the outside of the gear body (6). The needle tube camera (916) takes a picture of the outside of the gear and transmits the captured image to the crack observation display (2). The operator determines whether there is a crack on the outside of the gear by observing the image on the display.

Images