Nondestructive testing device for size of automobile injection molded part

Abstract

The invention discloses a nondestructive testing device for the size of an automobile injection molded part, and belongs to the technical field of automobile injection molded part detection.The nondestructive testing device for the size of the automobile injection molded part comprises a detection cabinet body, heat dissipation holes are formed in the two sides of the detection cabinet body in a penetrating mode, and two door plates are hinged to the front face of the detection cabinet body; meanwhile, a control panel is installed on the front face of a door plate located at the top of the detection cabinet body, a partition plate is fixedly connected into the detection cabinet body, and a multi-angle detection assembly is installed in the center of the surface of the top end of the partition plate and used for comprehensively scanning and measuring all faces and positions of injection molding parts at different angles, so that comprehensive size data is obtained. By adopting the multi-angle detection assembly, the size scanner can scan the injection molding part in multiple directions, it is ensured that all parts of the injection molding part are subjected to comprehensive size measurement, meanwhile, the injection molding parts of various different shapes can be subjected to adaptive scanning, and the detection accuracy is improved. And the accurate size detection of a complicated or irregular part can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile injection molded parts detection, and in particular relates to a non-destructive detection device for automobile injection molded parts dimensions. Background Art

[0002] The automotive industry has extremely high requirements for the precision of components, especially injection molded parts, which directly affect the performance and safety of the entire vehicle. The non-destructive testing device for the dimensions of automotive injection molded parts is a device used to detect the dimensional accuracy of automotive injection molded parts. Its most significant feature is that it does not require any damage or contact to the object being tested. Through advanced sensors and detection technology, it can accurately measure the size, shape, thickness and other indicators of injection molded parts in real time.

[0003] When existing equipment inspects the dimensions of automotive injection molded parts, since these parts often have irregular structural shapes, it is often impossible to align these irregularly shaped parts with the inspection equipment's fixed measuring points or surfaces in one go. Therefore, the equipment needs to be constantly adjusted or manually intervened to ensure the comprehensiveness and accuracy of the inspection. This operation not only increases the cost of manual intervention, but also greatly reduces inspection efficiency and increases the overall production cycle. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a non-destructive testing device for the dimensions of automobile injection molded parts.

[0005] The technical solution adopted to solve the above technical problems is: a non-destructive testing device for the size of automobile injection molded parts, including a testing cabinet, heat dissipation holes are opened on both sides of the testing cabinet, and two door panels are hinged on the front of the testing cabinet, and a control panel and a display screen are installed on the front of the door panel at the top of the testing cabinet. A handle is welded on one side of the front of the door panel, and four supporting feet are installed at the bottom corners of the testing cabinet. A partition is fixedly connected to the inside of the testing cabinet, and a multi-angle detection component is installed at the center of the top surface of the partition, which is used to comprehensively scan and measure various surfaces and positions of the injection molded parts at different angles, so as to obtain comprehensive size data.

[0006] Through the above technical solutions, the dimensional scanner can provide high-precision, multi-angle dimensional detection, adapt to the complex shapes of injection molded parts, while improving detection efficiency, reducing human errors, and improving the consistency of product quality.

[0007] Furthermore, the multi-angle detection component includes a first bevel gear fixedly connected to the center of the top surface of the partition, and the top of the first bevel gear is rotatably connected to a U-shaped frame, and the inside of the U-shaped frame is rotatably connected to a driving gear, the driving gear connecting shaft is rotatably connected to the U-shaped frame, and the driving gear connecting shaft is rotatably connected to a second bevel gear, and the second bevel gear is meshed with the first bevel gear for transmission, a driving motor is installed at the center of the bottom surface of the partition, and the output end of the driving motor is rotatably connected to the partition and the first bevel gear, and the through end of the driving motor is fixedly connected to the U-shaped frame.

[0008] Through the above technical solution, the dual-axis rotation of the dimensional scanner in the horizontal and vertical directions can fully cover all directions of automotive injection molded parts. This multi-angle scanning ensures that the inspection process is not restricted by angles and that the dimensions of each part can be accurately measured without missing any details of complex shapes.

[0009] Furthermore, the top of the driving gear is connected to an outer gear ring, and the U-shaped frame engages and limits the outer gear ring. At the same time, the outer gear ring is slidably connected to the U-shaped frame. A size scanner is installed on the inner wall of the outer gear ring, and the connection between the size scanner installation shaft and the outer gear ring is the same width as the limited sliding part of the U-shaped frame and the outer gear ring. After the size scanner moves synchronously with the outer gear ring, the size scanner installation shaft is slidably connected to the U-shaped frame.

[0010] Through the above technical solution, the cooperation between the second bevel gear and the first bevel gear, and the synchronous movement of the drive gear and the outer ring gear ensure that there will be no deviation or uneven movement during the rotation of the dimension scanner, thereby ensuring high precision of dimension detection.

[0011] Furthermore, fixed plates are fixedly connected to both sides of the top of the U-shaped frame, and the fixed plates are arranged in an L-shaped structure. A first rotating frame arranged in a rectangular structure is rotatably connected between the two fixed plates, and the first rotating frame connecting shaft is rotatably connected to the fixed plate. At the same time, a connecting shaft on one side of the first rotating frame is rotatably connected to the second bevel gear, the second bevel gear is fixedly connected to the fixed plate, and a servo motor is installed on one side of the fixed plates away from the first rotating frame, the output end of the servo motor is rotatably connected to the fixed plate, and the through end of the servo motor is fixedly connected to the first rotating frame connecting shaft, and the second rotating frame is rotatably connected at the inner center of the first rotating frame.

[0012] Through the above technical solution, injection molded parts often have complex shapes and may have irregular features such as curves, bumps, etc. The dual-axis cyclic rotation motion allows the dimensional scanner to scan injection molded parts from different directions, especially for parts that are difficult to obtain comprehensive data through single-axis rotation. This dual-axis system provides more angles and perspectives, which can better adapt to various complex shapes.

[0013] Furthermore, the second rotating frame has the same structural setting as the first rotating frame, and the second rotating frame is smaller than the first rotating frame. Slide grooves are opened on both sides of the interior of the second rotating frame, and a double threaded rod is provided inside the slide groove. At the same time, the middle part of the double threaded rod rotates through the second rotating frame, and the two ends of the double threaded rod are rotatably connected to the second rotating frame, and clamps are threadedly connected on both sides of the double threaded rod.

[0014] Furthermore, the clamping jaw is located in the sliding groove, the clamping jaw is slidingly connected to the second rotating frame, and the second rotating frame limits the clamping jaw, a knob is rotatably connected to one side of the second rotating frame, and the knob connecting shaft is rotatably connected to the second rotating frame, and the through end of the knob connecting shaft is fixedly connected to the double threaded rod.

[0015] Through the above technical solution, during the entire rotation process, the self-rotation and rotation of the second double bevel gear rod and the first double bevel gear rod are coordinated, so that the first bevel gear and the second rotating frame rotate synchronously. This precise synchronous control ensures the stable rotation of the injection molded part and can achieve high-precision dimensional detection.

[0016] Furthermore, a first bevel gear is rotatably connected to the top center of the first rotating frame, and the first bevel gear connecting shaft is rotatably connected to the first rotating frame. At the same time, the through end of the first bevel gear connecting shaft is fixedly connected to the second rotating frame, and a first double bevel gear rod is transmission-connected to one side of the first bevel gear.

[0017] Furthermore, the first double bevel gear rod is rotatably connected to the first rotating frame, the first double bevel gear rod is transmission-connected to the second double bevel gear rod at one end away from the first bevel gear, and the second double bevel gear rod is rotatably connected to the first rotating frame, and the second double bevel gear rod is meshed with the second bevel gear at one end away from the first double bevel gear rod.

[0018] Through the above technical solution, the speed and rotation angle of the servo motor can be adjusted to flexibly adapt to injection molded parts of different shapes and sizes, so that the system can handle a variety of different types of injection molded parts, with a wide range of applications and high production flexibility.

[0019] The beneficial effects of the present invention are as follows: (1) The present invention can drive the first rotating frame to rotate with the connection with the fixed plate as the origin through the operation of the servo motor, so that the second double bevel gear rod on one side of the first rotating frame rotates along the circumferential direction of the second bevel gear while the second double bevel gear rod rotates on its own. When the second double bevel gear rod rotates on its own, the first double bevel gear rod can be rotated, thereby causing the first bevel gear to rotate, driving the second rotating frame to rotate inside the first rotating frame with the connection with the first rotating frame as the origin during the rotation of the first rotating frame, thereby causing the automobile injection molded parts to perform dual-axis cyclic rotation motion. The injection molded parts can be continuously rotated from different angles, so that each part of the injection molded parts can be accurately scanned or inspected. In particular, for injection molded parts with complex shapes or multiple faces, this rotation method can ensure that the inspection covers all areas that need to be inspected in multiple directions, avoiding omissions caused by angle limitations. (2) When the driving motor of the present invention is in operation, the U-shaped frame can be driven to rotate horizontally, so that the second bevel gear moves along the circumference of the first bevel gear and rotates on its own, thereby driving the driving gear to rotate in the vertical direction while following the horizontal rotation of the U-shaped frame, so that the outer gear ring moves synchronously with the driving gear, thereby causing the dimension scanner to rotate in a circular motion in the horizontal and vertical directions, and perform dimension detection on the automotive injection molded parts that perform dual-axis circular rotation motion, so that the dimension scanner can complete multi-angle detection of the injection molded parts in a continuous cycle. Compared with the traditional manual operation or single-axis rotation system, this design greatly improves the detection efficiency and reduces the detection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the first perspective of the present invention; Figure 2 It is a schematic structural diagram of the second viewing angle of the present invention; Figure 3 It is a schematic diagram of the internal structure of the detection cabinet of the present invention; Figure 4 This is a schematic structural diagram of the connection between the outer gear ring and the size scanner of the present invention; Figure 5 This is a schematic structural diagram of the connection between the first bevel gear and the second bevel gear of the present invention; Figure 6 This is a schematic structural diagram of the connection between the U-shaped frame and the outer gear ring of the present invention; Figure 7 It is a structural schematic diagram of the connection between the fixed plate and the first rotating frame of the present invention; Figure 8 yes Figure 6 A schematic diagram of the enlarged structure at point A; Figure 9 yes Figure 7 Schematic diagram of the enlarged structure at point B.

[0021] Figure numerals: 11. Detection cabinet; 12. Heat dissipation hole; 13. Support foot; 14. Door panel; 15. Handle; 16. Display screen; 17. Control panel; 18. Partition; 2. Multi-angle detection component; 21. Drive motor; 22. First bevel gear; 23. Second bevel gear; 24. U-shaped frame; 25. Drive gear; 26. External gear ring; 27. Dimension scanner; 28. Fixed plate; 29. ​​Servo motor; 210. First rotating frame; 211. Second rotating frame; 212. First bevel gear; 213. First double bevel gear rod; 214. Second double bevel gear rod; 215. Second bevel gear; 216. Knob; 217. Slide groove; 218. Double threaded rod; 219. Clamp. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1-Figure 3 As shown, a non-destructive testing device for the size of automotive injection molded parts of this embodiment includes a testing cabinet 11, with heat dissipation holes 12 running through both sides of the testing cabinet 11, and two door panels 14 hinged on the front of the testing cabinet 11, and a control panel 17 and a display screen 16 are installed on the front of the door panel 14 at the top of the testing cabinet 11, a handle 15 is welded on one side of the front of the door panel 14, and four supporting legs 13 are installed at the bottom corners of the testing cabinet 11, a partition 18 is fixedly connected to the inside of the testing cabinet 11, and a multi-angle detection component 2 is installed at the center of the top surface of the partition 18, which is used to comprehensively scan and measure various surfaces and positions of the injection molded parts at different angles, so as to obtain comprehensive size data, the multi-angle detection component 2 includes a first bevel gear 22 fixedly connected to the center of the top surface of the partition 18, and the top of the first bevel gear 22 is rotatably connected to a U-shaped frame 24, and fixed plates 28 are fixedly connected on both sides of the top of the U-shaped frame 24, and the fixed plate 28 is arranged in an L-shaped structure.

[0024] like Figures 1-9As shown, a first rotating frame 210 with a rectangular structure is rotatably connected between the two fixed plates 28, and the connecting shaft of the first rotating frame 210 is rotatably connected to the fixed plate 28. At the same time, a connecting shaft on one side of the first rotating frame 210 is rotatably connected to a second bevel gear 215, and the second bevel gear 215 is fixedly connected to the fixed plate 28, and a servo motor 29 is installed on one side of the fixed plate 28 away from the first rotating frame 210. The speed and rotation angle of the servo motor 29 can be adjusted to flexibly adapt to injection molded parts of different shapes and sizes, so that the system can cope with a variety of different types of injection molded parts, with a wide range of applications and high production flexibility. The output end of the servo motor 29 is rotatably connected to the fixed plate 28, and the through end of the servo motor 29 is fixedly connected to the connecting shaft of the first rotating frame 210. The second rotating frame 211 is rotatably connected to the center of the first rotating frame 210. The second rotating frame 211 has the same structural setting as the first rotating frame 210, and the second rotating frame 211 is smaller than the first rotating frame 210. The first bevel gear 212 is rotatably connected to the center of the top of the first rotating frame 210, and the first bevel gear 212 connecting shaft is rotatably connected to the first rotating frame 210. At the same time, the through end of the connecting shaft of the first bevel gear 212 is fixedly connected to the second rotating frame 211, and one side of the first bevel gear 212 is transmission-connected to the first double bevel gear rod 213. During the entire rotation process, the second double bevel gear rod 214 and the first double bevel gear rod 213 rotate in coordination with each other, so that the first bevel gear 212 and the second rotating frame 211 rotate synchronously. This precise synchronous control ensures the stable rotation of the injection molded part and can achieve high-precision dimensional detection. The first double bevel gear rod 213 is rotatably connected to the first rotating frame 210.

[0025] like Figure 2-Figure 9The first double bevel gear rod 213 is transmission-connected to the second double bevel gear rod 214 at one end away from the first bevel gear 212, and the second double bevel gear rod 214 is rotationally connected to the first rotating frame 210, and the second double bevel gear rod 214 is meshed with the second bevel gear 215 at one end away from the first double bevel gear rod 213 for transmission. Slide grooves 217 are provided on both sides of the interior of the second rotating frame 211, and double threaded rods 218 are provided inside the slide grooves 217. At the same time, the middle part of the double threaded rod 218 rotates through the second rotating frame 211, and the two ends of the double threaded rod 218 are rotationally connected to the second rotating frame 211. Injection molded parts often have complex shapes and may have irregular features such as curves, bumps, etc. The dual-axis cyclic rotation motion allows the size scanner 27 to scan injection molded parts from different directions, especially for those that are difficult to scan through a single axis rotation. The components for obtaining comprehensive data are rotated. This dual-axis system provides more angles and viewing angles and can better adapt to various complex shapes. The double-threaded rod 218 has threaded connections on both sides with clamping jaws 219. The clamping jaws 219 are located in the slide groove 217. The clamping jaws 219 are slidably connected to the second rotating frame 211, and the second rotating frame 211 limits the clamping jaws 219. One side of the second rotating frame 211 is rotatably connected to a knob 216, and the knob 216 connecting shaft is rotatably connected to the second rotating frame 211. At the same time, the knob 216 connecting shaft through-end is fixedly connected to the double-threaded rod 218. At the same time, the U-shaped frame 24 is rotatably connected to the driving gear 25, and the top of the driving gear 25 is transmission-connected to the outer gear ring 26, and the U-shaped frame 24 is engaged and limited to the outer gear ring 26, and the outer gear ring 26 is slidably connected to the U-shaped frame 24.

[0026] like Figure 3-Figure 9It is shown that a dimension scanner 27 is installed on the inner wall of the outer gear ring 26. The dimension scanner 27 can provide high-precision, multi-angle dimension detection, adapt to complex-shaped injection molded parts, and at the same time improve detection efficiency, reduce human errors, and improve product quality consistency. The connection between the mounting shaft of the dimension scanner 27 and the outer gear ring 26 is the same width as the limited sliding part of the U-shaped frame 24 and the outer gear ring 26. After the dimension scanner 27 moves synchronously with the outer gear ring 26, the mounting shaft of the dimension scanner 27 is slidably connected to the U-shaped frame 24, and the connecting shaft of the driving gear 25 is rotatably connected to the U-shaped frame 24, and the connecting shaft of the driving gear 25 is fixedly connected to the second bevel gear 23. Through the double-axis rotation of the dimension scanner 27 in the horizontal and vertical directions, it can fully cover Covering all directions of automobile injection molded parts, this multi-angle scanning can ensure that the detection process is not restricted by angles, ensure that the size of each part can be accurately measured, and will not miss any details of complex shapes. At the same time, the second bevel gear 23 is engaged with the first bevel gear 22 for transmission, the cooperation of the second bevel gear 23 and the first bevel gear 22, and the synchronous movement of the drive gear 25 and the outer gear ring 26 ensure that there will be no deviation or uneven movement during the rotation of the size scanner 27, thereby ensuring high precision of size detection. A drive motor 21 is installed at the center of the bottom surface of the partition 18, and the output end of the drive motor 21 is rotatably connected to the partition 18 and the first bevel gear 22, and the through end of the drive motor 21 is fixedly connected to the U-shaped frame 24.

[0027] The working principle of this embodiment is as follows: first, the door panel 14 on the top of the detection cabinet 11 is opened by the handle 15, and then the automobile injection molded part is placed between the four clamping jaws 219, and then the two knobs 216 on one side of the second rotating frame 211 are rotated to drive the double threaded rod 218 to rotate, so that the two clamping jaws 219 located in the slide groove 217 move toward each other, thereby clamping and fixing the automobile injection molded part, and then the door panel 14 is closed. The staff can operate the control panel 17 to make the drive motor 21 and the servo motor 29 run simultaneously.

[0028] The operation of the servo motor 29 can drive the first rotating frame 210 to rotate with the connection with the fixed plate 28 as the origin, so that the second double bevel gear rod 214 on one side of the first rotating frame 210 rotates along the circumferential direction of the second bevel gear 215, while the second double bevel gear rod 214 rotates on its own. When the second double bevel gear rod 214 rotates on its own, the first double bevel gear rod 213 can be rotated, thereby rotating the first bevel gear 212, driving the second rotating frame 211 to rotate inside the first rotating frame 210 with the connection with the first rotating frame 210 as the origin during the rotation of the first rotating frame 210, thereby prompting the automobile injection molded parts to perform dual-axis cyclic rotation motion.

[0029] When the drive motor 21 is running, it can drive the U-shaped frame 24 to rotate horizontally, so that the second bevel gear 23 moves along the circumference of the first bevel gear 22 and rotates on its own, thereby driving the drive gear 25 to rotate in the vertical direction while following the horizontal rotation of the U-shaped frame 24, so that the outer gear ring 26 moves synchronously with the drive gear 25, thereby causing the size scanner 27 to perform cyclic rotation in the horizontal and vertical directions, and perform dimensional inspection on the automobile injection molded parts that perform dual-axis cyclic rotation. After the inspection is completed, the inspection results are displayed on the display screen 16. Multi-angle and multi-directional inspections can be performed in a smaller space, avoiding the trouble of repeatedly adjusting the position of parts and greatly improving the efficiency of inspection.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A non-destructive testing device for the size of automotive injection molded parts, comprising a testing cabinet (11), heat dissipation holes (12) extending through both sides of the testing cabinet (11), two door panels (14) hingedly connected to the front of the testing cabinet (11), a control panel (17) and a display screen (16) being mounted on the front of the door panel (14) located at the top of the testing cabinet (11), a handle (15) being welded to one side of the front of the door panel (14), and four supporting legs (13) being mounted at the bottom corners of the testing cabinet (11), characterized in that: A partition (18) is fixedly connected to the interior of the detection cabinet (11), and a multi-angle detection component (2) is installed at the center of the top surface of the partition (18) for comprehensively scanning and measuring various surfaces and positions of the injection molded part at different angles, thereby obtaining comprehensive dimensional data.

2. The non-destructive testing device for automobile injection molded parts according to claim 1, characterized in that: The multi-angle detection component (2) includes a first bevel gear (22) fixedly connected to the center of the top surface of the partition (18), and the top of the first bevel gear (22) is rotatably connected to a U-shaped frame (24), and the inside of the U-shaped frame (24) is rotatably connected to a driving gear (25), the driving gear (25) connecting shaft is rotatably connected to the U-shaped frame (24), and the driving gear (25) connecting shaft is rotatably connected to a second bevel gear (23), and the second bevel gear (23) is meshed with the first bevel gear (22) for transmission, a driving motor (21) is installed at the center of the bottom surface of the partition (18), and the output end of the driving motor (21) is rotatably connected to the partition (18) and the first bevel gear (22), and the through end of the driving motor (21) is fixedly connected to the U-shaped frame (24).

3. The non-destructive testing device for automobile injection molded parts according to claim 2, characterized in that: The top of the driving gear (25) is connected to the outer gear ring (26) in a transmission manner, and the U-shaped frame (24) is engaged with the outer gear ring (26) to limit the position. At the same time, the outer gear ring (26) is slidably connected to the U-shaped frame (24). A size scanner (27) is installed on the inner wall of the outer gear ring (26). The connection between the mounting shaft of the size scanner (27) and the outer gear ring (26) is the same width as the limiting sliding portion between the U-shaped frame (24) and the outer gear ring (26). After the size scanner (27) moves synchronously with the outer gear ring (26), the mounting shaft of the size scanner (27) is slidably connected to the U-shaped frame (24).

4. The non-destructive testing device for automobile injection molded parts according to claim 2, characterized in that: Fixed plates (28) are fixedly connected to both sides of the top of the U-shaped frame (24), and the fixed plates (28) are arranged in an L-shaped structure. A first rotating frame (210) arranged in a rectangular structure is rotatably connected between the two fixed plates (28), and the connecting shaft of the first rotating frame (210) is rotatably connected to the fixed plate (28). At the same time, a second bevel gear (215) is rotatably connected to the connecting shaft on one side of the first rotating frame (210). The second bevel gear (215) is fixedly connected to the fixed plate (28), and a servo motor (29) is installed on a side of one of the fixed plates (28) away from the first rotating frame (210). The output end of the servo motor (29) is rotatably connected to the fixed plate (28), and the through end of the servo motor (29) is fixedly connected to the connecting shaft of the first rotating frame (210). The second rotating frame (211) is rotatably connected to the center of the first rotating frame (210).

5. The non-destructive testing device for automobile injection molded parts according to claim 4, characterized in that: The second rotating frame (211) and the first rotating frame (210) have the same structural setting, and the second rotating frame (211) is smaller than the first rotating frame (210). Slide grooves (217) are provided on both sides of the interior of the second rotating frame (211), and a double-threaded rod (218) is provided inside the slide groove (217). At the same time, the middle part of the double-threaded rod (218) rotates through the second rotating frame (211), and the two ends of the double-threaded rod (218) are rotatably connected to the second rotating frame (211), and clamping claws (219) are threadedly connected to the two sides of the double-threaded rod (218).

6. The non-destructive testing device for automobile injection molded parts dimensions according to claim 5, characterized in that: The clamping claw (219) is located in the sliding groove (217), the clamping claw (219) is slidably connected to the second rotating frame (211), and the second rotating frame (211) limits the clamping claw (219), and a knob (216) is rotatably connected to one side of the second rotating frame (211), and the knob (216) connecting shaft is rotatably connected to the second rotating frame (211), and the through end of the knob (216) connecting shaft is fixedly connected to the double-threaded rod (218).

7. The non-destructive testing device for automobile injection molded parts dimensions according to claim 4, characterized in that: A first bevel gear (212) is rotatably connected to the center of the top of the first rotating frame (210), and a connecting shaft of the first bevel gear (212) is rotatably connected to the first rotating frame (210), while a through-end of the connecting shaft of the first bevel gear (212) is fixedly connected to the second rotating frame (211), and a first double bevel gear rod (213) is transmission-connected to one side of the first bevel gear (212).

8. The non-destructive testing device for automobile injection molded parts dimensions according to claim 7, characterized in that: The first double bevel gear rod (213) is rotatably connected to the first rotating frame (210); one end of the first double bevel gear rod (213) away from the first bevel gear (212) is transmission-connected to the second double bevel gear rod (214); the second double bevel gear rod (214) is rotatably connected to the first rotating frame (210); and one end of the second double bevel gear rod (214) away from the first double bevel gear rod (213) is meshed with the second bevel gear (215) for transmission.

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