Crack detection equipment and method based on automobile gear structure

Abstract

The invention belongs to the technical field of automobile gears, particularly relates to crack detection equipment and method based on an automobile gear structure, and provides the following scheme aiming at adapting to gear surface change and being difficult to maintain detection angle and distance: the crack detection equipment comprises a workbench, and the top end of the workbench is fixedly connected with a crack observation display; a bracket is fixedly connected to the top end of the workbench, a connecting frame is fixedly connected to the top end of the bracket, an automatic rotating seat is movably connected to the top end of the workbench, a supporting frame is fixedly connected to the top end of the automatic rotating seat, a gear body is arranged at the top end of the supporting frame, and a surface detection assembly is arranged on the inner side of the gear body. The crack detection equipment and method based on the automobile gear structure have the advantages that the outer side surface of the gear can be comprehensively scanned, detection dead angles are avoided, no crack is missed, the needle tube camera can adapt to the shape change of the surface of the gear, proper detection angle and distance are kept all the time, and the detection accuracy is improved. Therefore, the detection precision is improved.

Description

Technical Field

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

[0002] The automobile gear structure mainly includes planetary gear mechanisms and speed change gear mechanisms. These structures play a vital role in the automobile transmission system. Through different fixing or constraint methods, a variety of transmission ratios can be achieved to meet different power requirements. Their application in automobiles not only improves the convenience and comfort of operation, but also enhances the vehicle's passability and the flexibility of power distribution.

[0003] Existing devices can only detect partial areas of the automobile gear structure, which is prone to blind spots and is likely to miss some cracks. They cannot adapt to the shape changes of the gear surface and it is difficult to maintain a suitable detection angle and distance, thereby reducing the detection accuracy. Summary of the invention

[0004] The invention discloses a crack detection device and method based on an automobile gear structure, aiming to solve the technical problems in the background technology that the eyewash treatment efficiency is low and the equipment is easily damaged.

[0005] The present invention proposes a crack detection device based on an automobile gear structure, comprising a workbench, a crack observation display fixedly connected to the top of the workbench, a bracket fixedly connected to the top of the workbench, a connecting frame fixedly connected to the top of the bracket, an automatic rotating seat movably connected to the top of the workbench, and a support frame fixedly connected to the top of the automatic rotating seat, a gear body is arranged at the top of the support frame, a surface detection component is arranged on the inner side of the gear body, and a crack detection component is arranged on the outer side of the gear body; The crack detection assembly includes a pinhole camera, which is located outside the gear body, and a connector is fixedly connected to the bottom end of the pinhole camera; The surface detection component comprises a symmetrical arc-shaped support plate, the outer side of the arc-shaped support plate contacts the inner side of the gear body, and symmetrical detection heads are arranged on the opposite side of the arc-shaped support plate, and the detection heads are both located above the gear body.

[0006] In a preferred scheme, the crack detection assembly also includes a driving motor, a power output shaft of the driving motor is connected to a rotating rod through a coupling, the top outer side of the rotating rod is fixedly connected to a bracket, and a limiting ring frame is arranged on the outside of the bracket, the bottom end of the limiting ring frame is fixedly connected to a telescopic driving rod, the bottom end of the limiting ring frame away from the telescopic driving rod is fixedly connected to the telescopic rod, a compression spring is arranged on the outside of the telescopic rod, the top of the compression spring is fixedly connected to the bottom end of the limiting ring frame, the top of the bracket is fixedly connected to a base, the inner side of the base is movably connected to a movable rod, and one end of the movable rod close to the telescopic rod is movably connected to a mounting piece, the bottom end of the mounting piece is fixedly connected to the top of the bracket, a U-shaped frame is fixedly connected to the outside of the movable rod, the top of the U-shaped frame is fixedly connected to the bottom end of the connector, the outer side of one end of the movable rod away from the mounting piece is fixedly connected to a fixed shaft, and the bottom end of the fixed shaft is fixedly connected to an L-shaped rod, one end of the L-shaped rod is movably connected to a roller, and an annular groove is provided on the inner side of the limiting ring frame, and the roller is located on the outside of the annular groove.

[0007] By providing a crack detection component, when detecting cracks on the outer side of automobile gears, the pinhole camera is located on the outer side of the gear body, and the start of the drive motor drives the rotating rod to rotate. When the rotating rod rotates, the bracket also rotates, driving the pinhole camera to adjust the angle of the gear body. The fixed shaft fixed at one end of the movable rod drives the L-shaped rod and the roller to move, and the roller rolls in the annular groove on the inner side of the limiting ring frame. Since the roller is in the annular groove, the movement trajectory of the movable rod can be limited. The telescopic driving rod can be extended or shortened as needed. When extended, it will push the limiting ring frame, and then the pinhole camera is close to the gear body through the compression spring, etc., and the angle is adjusted according to the outer tooth groove shape of the gear body, so as to see more clearly. Detect cracks on the gear surface; when it is shortened, it will pull the limit ring frame to keep the pinhole camera away from the gear body. When the telescopic drive rod moves or the gear surface is uneven and causes the pinhole camera to be subjected to external force, the compression spring plays a role of buffering and adjustment. When the pinhole camera is subjected to outward force, the compression spring is compressed, and the movable rod will move a certain distance away from the gear; when the external force disappears, the compression spring restores its deformation, allowing the pinhole camera to return to the appropriate detection position. During the process, the outer surface of the gear can be fully scanned to avoid blind angles and ensure that no cracks are missed. The pinhole camera can adapt to the shape changes of the gear surface and always maintain a suitable detection angle and distance, thereby improving detection accuracy.

[0008] The top end of the connecting rod is fixedly connected to the fixing frame, and the bottom end of the telescopic driving rod, the telescopic rod and the compression spring are fixedly connected to the top end of the fixing frame, and the inner side of the fixing frame is fixedly connected with a symmetrical connecting round rod, and the two connecting round rods are fixedly connected to the sliding frame at both ends, and the inner side of the rear end of the sliding frame is movably connected with a connecting rod, 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 bracket, the top end of the connecting frame is fixedly connected to the fixing seat, the inner side of the fixing seat is movably connected with a rotating rod, and the outer sides of the two ends of the rotating rod are fixedly connected to the rotating shaft, the end of the rotating rod close to the crack observation display is connected to the rotating motor through a coupling, and the outer side of the rotating shaft is movably connected with a pulling rope, and the connecting frame is provided with symmetrical circular holes, and the pulling rope is movably connected between the inside of the circular holes, the bottom end of the pulling rope is fixedly connected to the top end of the sliding frame, and the pulling rope is located on both sides of the connecting round rod.

[0009] In a preferred scheme, the surface detection assembly also includes a mounting frame, the bottom end of the mounting frame is fixedly connected to the top end of the supporting frame, the top end of the mounting frame is fixedly connected with an upper and lower connecting piece, the upper and lower connecting pieces are located between the inner sides of the gear body, and the inner sides of the upper and lower connecting pieces are fixedly connected with a two-way telescopic electric rod, both ends of the two-way telescopic electric rod are fixedly connected with a connecting plate, the opposite side of the connecting plate is fixedly connected with a buffer spring, the side of the buffer spring away from the connecting plate and the side opposite to the arc-shaped supporting plate are fixedly connected, the top ends of the upper and lower connecting pieces are fixedly connected with an upper plate, the top end of the upper plate is fixedly connected with a two-way servo motor, the power output heads at both ends of the two-way servo motor are connected with a rotating threaded rod through a coupling, and the outer sides of the rotating threaded rod are movably connected to a limiting frame, the inner sides of the limiting frames are fixedly connected with symmetrical auxiliary round rods, the auxiliary round rods and the outer sides of the rotating threaded rods are movably connected with sliding pieces, and the top of the sliding piece is fixedly connected to the bottom end of the detection head.

[0010] By providing a surface detection component, when the surface of the automobile gear is detected, the two-way telescopic electric rod starts to work, and its two ends are extended or shortened according to the size of the gear body. When extended, the connecting plates at both ends are pushed, and the connecting plates then push the arc-shaped support plates to move away from the upper and lower connecting parts through the buffer spring, so that the arc-shaped support plates are more closely fitted to the inner side of the gear body, playing a role of stable support and positioning. When shortened, the connecting plates are pulled to make the arc-shaped support plates close to the upper and lower connecting parts, which can adapt to gears of different sizes. During the action of the two-way telescopic electric rod, the buffer spring plays a role of buffering and adjustment. When the arc-shaped support plate is subjected to a large external force, the buffer spring is compressed to prevent the arc-shaped support plate from causing damage to the inner side of the gear body; when the external force disappears, the buffer The spring restores its deformation, causing the arc-shaped support plate to return to the appropriate position, and the bidirectional servo motor starts, driving the rotating threaded rods at both ends to rotate. The rotation of the rotating threaded rod will cause 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 laterally above the gear body. Through the forward and reverse rotation of the bidirectional servo motor, the detection head can perform reciprocating motion above the gear body, thereby performing a comprehensive inspection of the gear surface. The auxiliary round rod provides a stable guide for the sliding part to ensure that the sliding part will not deviate or shake during the movement, so that the detection head can move smoothly along a straight line trajectory, thereby improving the accuracy and reliability of the inspection. During the process, the gear surface can be fully covered to achieve detection without dead angles, ensuring that various defects on the gear surface can be found.

[0011] 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 as described above, comprises the following steps: Step 1: Place the automotive gear to be tested 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, surface detection component and crack detection component, and check whether each component is working normally, such as checking whether the needle tube camera can shoot normally and whether the detection head can collect data normally; Step 2: Start the surface detection component, push the arc-shaped support plate to contact the inner side of the gear body, and the detection head is located above the gear. The detection head scans along the gear surface to collect images and data information on the gear surface to detect whether there are defects such as cracks on the gear surface; Step 3: Start the automatic rotating seat to drive the gear body to rotate slowly. At the same time, adjust the position and angle of the pinhole camera so that it can be aimed at the outside of the gear body. The pinhole camera shoots the outside of the gear and transmits the captured image to the crack observation display. The operator determines whether there is a crack on the outside of the gear by observing the image on the display.

[0012] From the above, it can be seen that the crack detection equipment based on the automobile gear structure provided by the present invention has the ability to comprehensively scan the outer surface of the gear, avoid blind angles in detection, ensure that no cracks are missed, and allow the pinhole camera to adapt to the shape changes of the gear surface and always maintain a suitable detection angle and distance, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 2 This is a schematic diagram of the structure above the workbench of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 3 A schematic diagram of the inner structure of a gear body of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 4 This is a schematic diagram of the upper structure of a support of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 5 A schematic diagram of the structure of a crack detection component of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 6 A partial structural schematic diagram of a crack detection component of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 7 This is a schematic diagram of the structure of a surface detection component of a crack detection device based on an automobile gear structure proposed by the present invention; Figure 8 This is a partial structural schematic diagram of a surface detection component of a crack detection device based on an automobile gear structure proposed by the present invention.

[0014] 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, two-way telescopic electric rod; 704, connecting plate; 705, buffer spring; 706, arc support plate; 707, upper plate; 708, two-way 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, drive 1. 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 piece; 910. movable rod; 911. U-shaped frame; 912. fixed shaft; 913. L-shaped rod; 914. roller; 915. connector; 916. needle tube 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 DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] The crack detection device based on the automobile gear structure disclosed in the present invention is mainly used in scenarios where only a partial area on the outer side of the gear can be detected, blind spots and cracks are easily missed, the pinhole camera cannot adapt to changes in the gear surface, and it is difficult to maintain the detection angle and distance, thereby reducing the detection accuracy.

[0017] Reference Figure 1-8 A crack detection device based on an automobile gear structure comprises a workbench 1, a crack observation display 2 is fixedly connected to the top of the workbench 1, a bracket 3 is fixedly connected to the top of the workbench 1, a connecting frame 8 is fixedly connected to the top of the bracket 3, an automatic rotating seat 4 is movably connected to the top of the workbench 1, and a support frame 5 is fixedly connected to the top of the automatic rotating seat 4, a gear body 6 is arranged at the top of the support frame 5, a surface detection component 7 is arranged on the inner side of the gear body 6, and a crack detection component 9 is arranged on the outer side of the gear body 6; The crack detection assembly 9 includes a pinhole camera 916, which 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 includes 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 a symmetrical detection head 713 is provided on the opposite side of the arc-shaped support plate 706 , and the detection head 713 is located above the gear body 6 .

[0018] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 The crack detection component 9 also includes a driving motor 901, the power output shaft of the driving motor 901 is connected to a rotating rod 902 through a coupling, the top outer side of the rotating rod 902 is fixedly connected to a bracket 903, and a limiting ring frame 907 is arranged on the outer side of the bracket 903, the bottom end of the limiting ring frame 907 is fixedly connected to a telescopic driving rod 904, the bottom end of the limiting 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 limiting ring frame 907, the top end of the bracket 903 is fixedly connected to a base 908, and the inner side of the base 908 A movable rod 910 is movably connected, and the end of the movable rod 910 close to the telescopic rod 906 is movably connected to a mounting piece 909, the bottom end of the mounting piece 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, the outer side of one end of the movable rod 910 away from the mounting piece 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 the outer side of a roller 914, 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.

[0019] Specifically, when detecting cracks on the outside of automobile gears, the needle tube camera 916 is located on the outside of the gear body 6, and the driving motor 901 is started to drive the rotating rod 902 and the bracket 903 to rotate, so as to adjust the angle of the needle tube camera 916. The roller 914 at one end of the movable rod 910 rolls in the annular groove of the limiting ring frame 907 to limit the trajectory of the movable rod 910. The telescopic driving rod 904 is telescopic as needed. When extended, it pushes the needle tube camera 916 close to the gear and adjusts the angle according to the tooth groove to facilitate the detection of cracks; when shortened, it pulls the needle tube camera 916 away. When extended and retracted, the compression spring 905 is buffered and adjusted, and the movable rod 910 is compressed by the outward force to move away from the gear, and the position is restored when the external force disappears.

[0020] Reference Figure 1 , Figure 2 and Figure 3In a preferred embodiment, 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 fixedly connected to the top of the fixing frame 17, and the inner side of the fixing frame 17 is fixedly connected to a symmetrical connecting round rod 18, both ends of the two connecting round rods 18 are fixedly connected to the 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 of the bracket 3. The top 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, the outer sides of both ends of the rotating rod 13 are fixedly connected to rotating shafts 14, the end of the rotating rod 13 close to the crack observation display 2 is connected to a rotating motor 15 through a coupling, the outer sides of the rotating shaft 14 are movably connected to pulling ropes 16, symmetrical circular holes are opened on the connecting frame 8, and the pulling ropes 16 are movably connected between the insides of the circular holes, the bottom ends of the pulling ropes 16 are fixedly connected to the top of the sliding frame 10, and the pulling ropes 16 are located on both sides of the connecting round rod 18.

[0021] Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 and Figure 8 The surface detection assembly 7 also includes a mounting frame 701, the bottom end of the mounting frame 701 is fixedly connected to the top of the support frame 5, the top of the mounting frame 701 is fixedly connected with an upper and lower connecting member 702, the upper and lower connecting member 702 is 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 with a two-way telescopic electric rod 703, both ends of the two-way telescopic electric rod 703 are fixedly connected with a connecting plate 704, and the opposite side of the connecting plate 704 is fixedly connected with a buffer spring 705, and the buffer spring 705 is away from the connecting plate 704. The side opposite to the arc support plate 706 is fixedly connected. The upper and lower connecting members 702 are fixedly connected to an upper plate 707 at the top, and a bidirectional servo motor 708 is fixedly connected to the top of the upper plate 707. The power output heads at both ends of the bidirectional servo motor 708 are connected to a rotating threaded rod 709 through a coupling, and the outer side of the rotating threaded rod 709 is movably connected to a limit frame 710, and the inner side of the limit frame 710 is fixedly connected to a symmetrical auxiliary round rod 711, and the auxiliary round rod 711 and the outer side of the rotating threaded rod 709 are movably connected to a sliding member 712, and the top of the sliding member 712 is fixedly connected to the bottom end of the detection head 713.

[0022] Specifically, when detecting the surface of automobile gears, the bidirectional telescopic electric rod 703 is extended and retracted according to the size of the gear. When extended, the connecting plate 704 is pushed through the buffer spring 705 to make the arc support plate 706 fit the inner side of the gear body 6, which plays a role of stable support and positioning; when shortened, the connecting plate 704 is pulled to make the arc support plate 706 close to the connecting piece to adapt to different gears. During the operation, the buffer spring 705 is buffered and adjusted. When subjected to external force, it is compressed to prevent damage, and it recovers when the external force disappears. The bidirectional servo motor 708 is started, driving the rotating threaded rod 709 to rotate, so that the sliding member 712 moves on the auxiliary round rod 711 and the rotating threaded rod 709, thereby driving the detection head 713 to move horizontally, and the forward and reverse rotation realizes reciprocating motion, and the gear surface is fully detected. The auxiliary round rod 711 guides the sliding member 712 to ensure that the detection head 713 moves smoothly and linearly, thereby improving the detection accuracy and reliability.

[0023] 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 as described above, comprises the following steps: Step 1: Place the automobile gear to be tested 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 shoot normally, whether the detection head 713 can collect data normally, etc.; 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 the detection head 713 is located above the gear. The detection head 713 scans along the gear surface to collect images and data information on the gear surface to detect whether there are defects such as cracks on the gear surface; Step three, start the automatic rotating seat 4 to drive the gear body 6 to rotate slowly. At the same time, by adjusting the position and angle of the needle tube camera 916 so that it can be aimed at the outside of the gear body 6, the needle tube camera 916 shoots 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.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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).

2. A crack detection device based on an automobile gear structure according to claim 1, characterized in that: The crack detection assembly (9) further comprises a driving motor (901), wherein a power output shaft of the driving motor (901) is connected to a rotating rod (902) via a coupling, a bracket (903) is fixedly connected to the outer side of the top end of the rotating rod (902), and a limit ring frame (907) is arranged on the outer side of the bracket (903), a telescopic driving rod (904) is fixedly connected to the bottom end of the limit ring frame (907), and a telescopic rod (906) is fixedly connected to the bottom end of the limit ring frame (907) on a side away from the telescopic driving rod (904).

3. A crack detection device based on an automobile gear structure according to claim 2, characterized in that: 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 limiting ring frame (907), the top end of the bracket (903) is fixedly connected to the base (908), the inner side of the base (908) is movably connected to a movable rod (910), 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).

4. The crack detection device based on the automobile gear structure according to claim 3 is characterized in that: The outer side of the movable rod (910) is fixedly connected to a U-shaped frame (911), the top of the U-shaped frame (911) is fixedly connected to the bottom 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), the outer side of one end of the L-shaped rod (913) is movably connected to a roller (914), 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.

5. The crack detection device based on the automobile gear structure according to claim 4 is 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).

6. A crack detection device based on an automobile gear structure according to claim 5, 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).

7. The crack detection device based on the automobile gear structure according to claim 6 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).

8. The crack detection device based on the automobile gear structure according to claim 7 is 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).

9. The crack detection device based on the automobile gear structure according to claim 8, 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).

10. 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 9, 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, whether the detection head (713) can collect data normally, etc.; 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 defects such as cracks 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