A bluetooth earphone testing device

Abstract

The application relates to the technical field of Bluetooth earphone testing, in particular to a Bluetooth earphone testing device, which comprises a Bluetooth earphone charging box tool, a Bluetooth earphone tool, a pressing testing device, a data analysis processing device, a mechanical arm, a camera device and a protection piece. The beneficial effect is that the mechanical arm drives the connecting sleeve to move around the Bluetooth earphone charging box body and the Bluetooth earphone body, the camera device in the connecting sleeve shoots the surfaces of the Bluetooth earphone charging box body and the Bluetooth earphone body, and the image data is uploaded to the data analysis processing device, the data analysis processing device analyzes and compares the image data, judges defects and analyzes faults, effectively prevents a large number of product defects caused by production line mechanical faults, effectively puts forward products with defects, and guarantees the yield of products.

Description

Technical Field

[0001] This invention relates to the field of Bluetooth headset testing technology, specifically to a Bluetooth headset testing device. Background Technology

[0002] Bluetooth headsets apply Bluetooth technology to hands-free headsets, allowing users to be free from the entanglement of annoying wires and make calls freely and easily in various ways. During the production of Bluetooth headsets, testing equipment is required to test the Bluetooth headset and the charging case, to check the pairing of the two or the buttons, and a visual inspection system can be installed on the testing equipment to detect surface defects of the Bluetooth headset and the charging case.

[0003] A vision inspection system uses industrial cameras to replace human eyes in performing functions such as identification, measurement, and positioning. A typical vision inspection system consists of a camera, lens, and light source. It can replace manual labor in inspecting barcode characters, cracks, packaging, surface coating integrity, dents, and other defects. Using a vision inspection system can effectively improve the inspection speed and accuracy of production lines, significantly increase output and quality, reduce labor costs, and prevent misjudgments caused by human eye fatigue.

[0004] Existing Bluetooth headset testing devices equipped with vision inspection systems use robotic arms to move camera devices, allowing the cameras to inspect the Bluetooth headsets and charging cases from all angles. However, during inspection, the camera device may come into contact with other objects while the robotic arm is moving, causing damage to the camera device and reducing the lifespan of the vision inspection system. Furthermore, existing vision inspection systems can only detect surface defects and cannot determine whether a specific mechanism of the production equipment has malfunctioned based on a large number of specific defects. Summary of the Invention

[0005] The purpose of this invention is to provide a Bluetooth headset testing device to solve the problem of camera devices being bumped and damaged when moved.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A Bluetooth headset testing device, the Bluetooth headset testing device comprising:

[0008] A Bluetooth earphone charging case fixture is set on the top surface of the test device body and limits the Bluetooth earphone charging case body;

[0009] A Bluetooth headset fixture is mounted on the top surface of the testing device body and limits the movement of the Bluetooth headset body.

[0010] The pressure testing device is located on the top surface of the main body of the testing device.

[0011] A data analysis and processing device is provided on the top surface of the test device body;

[0012] A robotic arm is provided on the top surface of the test device body, and the robotic arm is connected with a connecting sleeve;

[0013] A camera device is provided inside the connecting sleeve; and

[0014] A protective member is provided on the surface of the connecting sleeve and protects the camera device.

[0015] Preferably, one end of the connecting sleeve is provided with a protective inclined surface, and a protective outer ring is provided at the outer end of the protective inclined surface. The protective outer ring is in a ring structure. When the camera device works, it is arranged close to the protective outer ring, and the camera device does not extend out of the protective outer ring.

[0016] Preferably, a pressure sensor and an infrared sensor are provided on the surface of the protective outer ring away from the protective inclined surface. An electric telescopic rod is provided at the innermost end inside the connecting sleeve. The extending end of the electric telescopic rod is connected with the camera device. Both the pressure sensor and the infrared sensor are connected with the electric telescopic rod and control the contraction of the electric telescopic rod.

[0017] Preferably, a protective groove is provided inside the connecting sleeve. The cross-section of the protective groove is in a fan-shaped structure, and a protective plate is provided inside the protective groove. One end of the protective plate is sleeved on the surface of a protective rotating shaft. Both ends of the protective rotating shaft extend out of the protective plate and are rotatably connected with the protective groove, and the protective plate rotates synchronously with the protective rotating shaft.

[0018] Preferably, a protective adjustment groove is provided inside the connecting sleeve. The protective adjustment groove is located between the protective groove and the electric telescopic rod, and an adjustment rotating plate is provided inside the protective adjustment groove. The adjustment rotating plate is in a hollow cylinder structure, and the inner diameter of the adjustment rotating plate is larger than the diameter of the camera device.

[0019] Preferably, rotating limit grooves are provided on both side surfaces of the protective adjustment groove. Rotating limit blocks are provided on both side surfaces of the adjustment rotating plate, and the rotating limit blocks are located inside the rotating limit grooves. Both the rotating limit blocks and the rotating limit grooves are in a ring structure, and their cross-sections are in a "C" - shaped structure. The rotating limit grooves and the rotating limit blocks cooperate to limit the rotation of the adjustment rotating plate.

[0020] Preferably, a linkage baffle is provided inside the adjustment rotating plate. The cross-section of the linkage baffle is in an "L" - shaped structure. Teeth are provided on the inner wall of the linkage baffle. There are multiple groups of teeth, and the teeth are distributed in a circular pattern with the axis of the linkage baffle as the center. A linkage rotating shaft is provided on the side surface of the protective adjustment groove close to the protective groove. One end of the linkage rotating shaft is located inside the protective adjustment groove, and the other end passes through the connecting sleeve and extends into the protective groove. A linkage gear is sleeved on the end of the linkage rotating shaft close to the linkage baffle, and the linkage gear meshes with the teeth.

[0021] Preferably, a protective fixing groove is formed on the surface of the protective plate close to the side of the linkage rotating shaft. The cross-section of the protective fixing groove is in a "C" shape and penetrates through the protective plate. A first bevel gear is connected to one end of the linkage rotating shaft close to the protective fixing groove. A second bevel gear is sleeved on the surface of the protective rotating shaft, and the second bevel gear is located inside the protective fixing groove. The second bevel gear is meshed with the first bevel gear. A limiting retaining groove is formed inside the connecting sleeve. A limiting retaining block is sleeved on the middle end surface of the linkage rotating shaft, and the limiting retaining block is located inside the limiting retaining groove. The limiting retaining groove and the limiting retaining block cooperate to axially limit the linkage rotating shaft.

[0022] Preferably, adjusting guide grooves are formed on the inner wall of the adjusting rotating plate. An adjusting guide rod is connected to one end of the camera device close to the electric telescopic rod. The other end of the adjusting guide rod is inserted into the adjusting guide grooves. There are two groups of adjusting guide grooves and adjusting guide rods, and they are circumferentially distributed with the axis of the camera device as the center of the circle.

[0023] Preferably, the adjusting guide groove includes a first guide groove, a second guide groove and a third guide groove. One end of the second guide groove is connected to the first guide groove, and the other end is connected to the third guide groove. The first guide groove is close to the protective groove. The first guide groove and the third guide groove are arranged in parallel, and the second guide groove is in a spiral structure.

[0024] In this invention, the Bluetooth headset charging box body is placed on the surface of the Bluetooth headset charging box tooling, the Bluetooth headset body is placed on the surface of the Bluetooth headset tooling, and the Bluetooth headset tooling and the Bluetooth headset charging box tooling place the Bluetooth headset body inside the Bluetooth headset charging box body, so as to test the matching degree between the Bluetooth headset charging box body and the Bluetooth headset body. And press the test device to press the buttons on the surface of the Bluetooth headset charging box body to test whether the buttons are normal. When testing the Bluetooth headset charging box body and the Bluetooth headset body, the robotic arm drives the connecting sleeve to move around the Bluetooth headset charging box body and the Bluetooth headset body, and the camera device inside the connecting sleeve takes pictures of the surfaces of the Bluetooth headset charging box body and the Bluetooth headset body, and uploads the image data to the data analysis and processing device. The data analysis and processing device analyzes and compares the image data for defect judgment and fault analysis, effectively preventing a large number of product defects caused by mechanical failures on the production line, and effectively detecting defective products, ensuring the yield rate of the products;

[0025] By combining pressure sensors and infrared sensors installed on the surface of the protective outer ring, when other objects come into contact with the outer ring, the pressure sensors detect pressure and transmit a signal to the electric telescopic rod, causing it to retract. When other objects are not in contact with the outer ring but are at a relatively close distance to the infrared sensors, the infrared sensors transmit a signal causing the electric telescopic rod to retract. During retraction, the electric telescopic rod moves the camera device toward the inside of the connecting sleeve. The camera device then moves the adjusting guide rod within the adjusting guide groove, from the first guide groove through the second guide groove to the third guide groove. This causes the adjusting plate to rotate, which in turn rotates the connecting baffle. The teeth on the surface of the connecting baffle engage with the connecting gears, causing the first bevel gear to rotate. This, in turn, engages with the second bevel gear, causing the protective shaft to rotate. This causes the protective plate to flip downwards and, in conjunction with the protective groove, protect the camera device, preventing contact and damage. This improves the lifespan of the visual inspection system and prevents inaccurate visual inspections caused by camera damage. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the connecting sleeve of the present invention;

[0028] Figure 3 This is a cross-sectional perspective view of the connecting sleeve of the present invention.

[0029] Figure 4 for Figure 3 An enlarged schematic diagram of the structure at point A;

[0030] Figure 5 This is a partial three-dimensional structural diagram of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the linkage baffle and protective rotating shaft of the present invention;

[0032] Figure 7 This is a partial three-dimensional structural diagram of the adjusting plate of the present invention.

[0033] In the diagram: 1. Test device body; 2. Data analysis and processing device; 3. Robotic arm; 4. Connecting sleeve; 4. Protective inclined surface; 401. Protective outer ring; 402. Bluetooth headset charging case fixture; 5. Bluetooth headset charging case body; 6. Bluetooth headset fixture; 7. Bluetooth headset body; 8. Press test device; 9. Pressure sensor; 10. Infrared sensor; 11. Camera device; 12. Protective groove; 13. Rotation limit groove; 14. Rotation limit block; 15. Protective adjustment groove; 16. Adjustment rotating plate; 17. Adjustment guide groove; 18. First guide groove; 1801; Second guide groove; 1802; Third guide groove; 1803; Adjustment guide rod; 19. Electric telescopic rod; 20. Linkage baffle; 21. Protective rotating shaft; 22. First bevel gear; 23. Linkage rotating shaft; 24. Limiting stop groove; 25. Limiting stop block; 26. Linkage gear; 27. Protective plate; 28. Teeth; 29. ​​Protective fixing groove; 30. Second bevel gear; 31. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 7 The present invention provides a technical solution:

[0036] A Bluetooth headset testing device includes: a Bluetooth headset charging case fixture 5, disposed on the top surface of the testing device body 1 and limiting the Bluetooth headset charging case body 6; a Bluetooth headset fixture 7, disposed on the top surface of the testing device body 1 and limiting the Bluetooth headset body 8; a pressing testing device 9, disposed on the top surface of the testing device body 1; a data analysis and processing device 2, disposed on the top surface of the testing device body 1; a robotic arm 3, disposed on the top surface of the testing device body 1 and connected to a connecting sleeve 4; a camera device 12, disposed inside the connecting sleeve 4; and a protective component, disposed on the surface of the connecting sleeve 4 and protecting the camera device 12; a protective inclined surface 401 is provided at one end of the connecting sleeve 4, and a protective outer ring 402 is provided at the outer end of the protective inclined surface 401. The protective outer ring 402 has a ring-shaped structure. When the camera device 12 is working, it is positioned close to the protective outer ring 402, and the camera device 12 does not extend out of the protective outer ring 402.

[0037] The present invention can be further configured such that a pressure sensor 10 and an infrared sensor 11 are provided on the surface of the outer protection ring 402 away from the protection inclined surface 401. An electric telescopic rod 20 is provided at the innermost end inside the connecting sleeve 4. The extending end of the electric telescopic rod 20 is connected to the imaging device 12. Both the pressure sensor 10 and the infrared sensor 11 are connected to the electric telescopic rod 20 and control the contraction of the electric telescopic rod 20. A protection groove 13 is formed inside the connecting sleeve 4. The cross-section of the protection groove 13 is in a fan-shaped structure, and a protection plate 28 is provided inside the protection groove 13. One end of the protection plate 28 is sleeved on the surface of the protection rotating shaft 22. Both ends of the protection rotating shaft 22 extend out of the protection plate 28 and are rotationally connected to the protection groove 13, and the protection plate 28 rotates synchronously with the protection rotating shaft 22.

[0038] The present invention can be further configured such that a protection adjustment groove 16 is formed inside the connecting sleeve 4. The protection adjustment groove 16 is located between the protection groove 13 and the electric telescopic rod 20. An adjustment rotating plate 17 is provided inside the protection adjustment groove 16. The adjustment rotating plate 17 is in a hollow cylindrical structure, and the inner diameter of the adjustment rotating plate 17 is larger than the diameter of the imaging device 12. Rotating limiting grooves 14 are formed on both side surfaces of the protection adjustment groove 16. Rotating limiting blocks 15 are provided on both side surfaces of the adjustment rotating plate 17, and the rotating limiting blocks 15 are located inside the rotating limiting grooves 14. Both the rotating limiting grooves 14 and the rotating limiting blocks 15 are in a ring structure, and their cross-sections are both in a "C" - shaped structure. The rotating limiting grooves 14 and the rotating limiting blocks 15 cooperate to limit the rotation of the adjustment rotating plate 17.

[0039] The present invention can be further configured such that a linkage baffle 21 is provided inside the adjustment rotating plate 17. The cross-section of the linkage baffle 21 is in an "L" - shaped structure. Teeth 29 are provided on the inner wall of the linkage baffle 21. There are multiple groups of teeth 29, and the teeth 29 are distributed in a circular pattern with the axis of the linkage baffle 21 as the center. A linkage rotating shaft 24 is provided on the side surface of the protection adjustment groove 16 close to the protection groove 13. One end of the linkage rotating shaft 24 is located inside the protection adjustment groove 16, and the other end passes through the connecting sleeve 4 and extends into the protection groove 13. A linkage gear 27 is sleeved on the end of the linkage rotating shaft 24 close to the linkage baffle 21. The linkage gear 27 is engaged with the teeth 29. A protection fixing groove 30 is formed on the side surface of the protection plate 28 close to the linkage rotating shaft 24. The cross-section of the protection fixing groove 30 is in a "C" - shaped structure and penetrates through the protection plate 28. A first bevel gear 23 is connected to the end of the linkage rotating shaft 24 close to the protection fixing groove 30. A second bevel gear 31 is sleeved on the surface of the protection rotating shaft 22, and the second bevel gear 31 is located inside the protection fixing groove 30. The second bevel gear 31 is engaged with the first bevel gear 23. A limiting retaining groove 25 is formed inside the connecting sleeve 4. A limiting retaining block 26 is sleeved on the middle surface of the linkage rotating shaft 24, and the limiting retaining block 26 is located inside the limiting retaining groove 25. The limiting retaining groove 25 and the limiting retaining block 26 cooperate to axially limit the linkage rotating shaft 24.

[0040] The invention can be further configured such that an adjustment guide groove 18 is provided on the inner wall of the adjustment plate 17, and an adjustment guide rod 19 is connected to one end of the camera device 12 near the electric telescopic rod 20. The other end of the adjustment guide rod 19 is inserted into the adjustment guide groove 18. Two sets of adjustment guide grooves 18 and adjustment guide rods 19 are provided, and they are distributed circumferentially with the axis of the camera device 12 as the center. The adjustment guide groove 18 includes a first guide groove 1801, a second guide groove 1802, and a third guide groove 1803. One end of the second guide groove 1802 is connected to the first guide groove 1801, and the other end is connected to the third guide groove 1803. The first guide groove 1801 is located near the protective groove 13, and the first guide groove 1801 and the third guide groove 1803 are arranged parallel to each other. The second guide groove 1802 has a spiral structure.

[0041] The present invention can be further configured such that a fault analysis system is provided inside the data analysis and processing device 2. By performing fractal comparison on the corresponding product parts produced by each mechanism of the production line, the environmental data of the production line, and the defect data captured by the camera device 12, a fault model is established through the data analysis and processing device 2, thereby performing fault analysis on the defects. By identifying the corresponding faults of specific mechanisms on the production line, multiple repetitive defects can be effectively reduced due to production line faults.

[0042] By placing the Bluetooth headset charging case body 6 on the surface of the Bluetooth headset charging case fixture 5, and the Bluetooth headset body 8 on the surface of the Bluetooth headset fixture 7, with the Bluetooth headset fixture 7 and Bluetooth headset charging case fixture 5 placing the Bluetooth headset body 8 inside the Bluetooth headset charging case body 6, the matching degree between the Bluetooth headset charging case body 6 and the Bluetooth headset body 8 is tested. A pressing test device 9 presses the button on the surface of the Bluetooth headset charging case body 6 to test its functionality. During the testing of the Bluetooth headset charging case body 6 and the Bluetooth headset body 8, a robotic arm 3 moves a connecting sleeve 4 around the Bluetooth headset charging case body 6 and the Bluetooth headset body 8. A camera device 12 inside the connecting sleeve 4 captures images of the surfaces of the Bluetooth headset charging case body 6 and the Bluetooth headset body 8, and uploads the image data to a data analysis and processing device 2. The data analysis and processing device 2 analyzes and compares the image data, performs defect judgment and fault analysis, effectively preventing a large number of product defects caused by production line mechanical failures, and effectively identifying defective products, thus ensuring the product yield rate.

[0043] The pressure sensor 10 and infrared sensor 11, installed on the surface of the protective outer ring 402, work together to cause pressure sensors 10 to sense pressure when other objects come into contact with the protective outer ring 402. This pressure sensor transmits a signal to the electric telescopic rod 20, causing it to retract. When other objects are not in contact with the protective outer ring 402 and are relatively close to the infrared sensor 11, the infrared sensor 11 transmits a signal causing the electric telescopic rod 20 to retract. When the electric telescopic rod 20 retracts, it moves the camera device 12 towards the inside of the connecting sleeve 4. The camera device 12 then moves the adjusting guide rod 19 within the adjusting guide groove 18, thus moving the adjusting guide rod 19... 9 moves from the first guide groove 1801 through the second guide groove 1802 to the inside of the third guide groove 1803, thereby driving the adjusting plate 17 to rotate. The adjusting plate 17 drives the connecting baffle 21 to rotate. The teeth 29 on the surface of the connecting baffle 21 cooperate with the connecting gear 27 to drive the first bevel gear 23 to rotate. In turn, the first bevel gear 23 cooperates with the second bevel gear 31 to drive the protective rotating shaft 22 to rotate, causing the protective plate 28 to flip downward and cooperate with the protective groove 13 to protect the camera device 12, preventing it from being touched and damaged. This improves the service life of the visual inspection system and prevents inaccurate visual inspection caused by damage to the camera device 12.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A Bluetooth headset testing device, characterized in that: The described Bluetooth headset testing device includes: A Bluetooth headset charging case tooling (5), which is arranged on the top surface of the testing device body (1) and limits the Bluetooth headset charging case body (6); A Bluetooth headset tooling (7), which is arranged on the top surface of the testing device body (1) and limits the Bluetooth headset body (8); A pressing testing device (9), which is arranged on the top surface of the testing device body (1); A data analysis and processing device (2), which is arranged on the top surface of the testing device body (1); A robotic arm (3), which is arranged on the top surface of the testing device body (1), and a connecting sleeve (4) is connected to the robotic arm (3); A camera device (12), which is arranged inside the connecting sleeve (4); and The protective member is disposed on the surface of the connecting sleeve (4) and protects the imaging device (12); a protective adjustment groove (16) is formed inside the connecting sleeve (4), and the protective adjustment groove (16) is located between the protective groove (13) and the electric telescopic rod (20), and an adjustment rotating plate (17) is provided inside the protective adjustment groove (16). The adjustment rotating plate (17) has a hollow cylindrical structure, and the inner diameter of the adjustment rotating plate (17) is larger than the diameter of the imaging device (12); a protective groove (13) is formed inside the connecting sleeve (4), and the cross-section of the protective groove (13) is in a fan-shaped structure, and a protective plate (28) is provided inside the protective groove (13). One end of the protective plate (28) is sleeved on the surface of the protective rotating shaft (22), and both ends of the protective rotating shaft (22) extend out of the protective plate (28) and are rotatably connected to the protective groove (13), and the protective plate (28) rotates synchronously with the protective rotating shaft (22); a protective fixing groove (30) is formed on one side surface of the protective plate (28) close to the linkage rotating shaft (24). The cross-section of the protective fixing groove (30) is in a "C" shape structure and penetrates through the protective plate (28). A first bevel gear (23) is connected to one end of the linkage rotating shaft (24) close to the protective fixing groove (30), and a second bevel gear (31) is sleeved on the surface of the protective rotating shaft (22), and the second bevel gear (31) is located inside the protective fixing groove (30). The second bevel gear (31) is meshed with the first bevel gear (23). A limiting retaining groove (25) is formed inside the connecting sleeve (4), and a limiting retaining block (26) is sleeved on the middle end surface of the linkage rotating shaft (24), and the limiting retaining block (26) is located inside the limiting retaining groove (25). The limiting retaining groove (25) and the limiting retaining block (26) cooperate to axially limit the linkage rotating shaft (24); an adjustment guiding groove (18) is formed on the inner wall of the adjustment rotating plate (17). An adjustment guiding rod (19) is connected to one end of the imaging device (12) close to the electric telescopic rod (20), and the other end of the adjustment guiding rod (19) is inserted into the adjustment guiding groove (18). Both the adjustment guiding groove (18) and the adjustment guiding rod (19) are provided in two groups and are circumferentially distributed with the axis of the imaging device (12) as the center; the adjustment guiding groove (18) includes a first guiding groove (1801), a second guiding groove (1802) and a third guiding groove (1803). One end of the second guiding groove (1802) is connected to the first guiding groove (1801), and the other end is connected to the third guiding groove (1803). The first guiding groove (1801) is close to the protective groove (13), the first guiding groove (1801) and the third guiding groove (1803) are arranged in parallel, and the second guiding groove (1802) is in a spiral structure;The adjusting plate (17) is equipped with a connecting baffle (21). The connecting baffle (21) has an "L" shaped cross-section. The inner wall of the connecting baffle (21) is provided with teeth (29). There are multiple sets of teeth (29), and the teeth (29) are distributed in a circle with the axis of the connecting baffle (21) as the center. The protective adjusting groove (16) is provided with a connecting shaft (24) on the side surface near the protective groove (13). One end of the connecting shaft (24) is located inside the protective adjusting groove (16), and the other end passes through the connecting sleeve (4) and extends into the protective groove (13). A connecting gear (27) is sleeved on the end of the connecting shaft (24) near the connecting baffle (21). The connecting gear (27) meshes with the teeth (29).

2. The Bluetooth headset testing device according to claim 1, characterized in that: One end of the connecting sleeve (4) is provided with a protective inclined surface (401), and a protective outer ring (402) is arranged at the outer end of the protective inclined surface (401). The protective outer ring (402) is of a ring structure. When the camera device (12) works, it is arranged close to the protective outer ring (402), and the camera device (12) does not extend out of the protective outer ring (402).

3. The Bluetooth headset testing device according to claim 2, characterized in that: A pressure sensor (10) and an infrared sensor (11) are arranged on the surface of the protective outer ring (402) away from the protective inclined surface (401). An electric telescopic rod (20) is arranged at the innermost end inside the connecting sleeve (4). The extending end of the electric telescopic rod (20) is connected to the camera device (12). Both the pressure sensor (10) and the infrared sensor (11) are connected to the electric telescopic rod (20) and control the contraction of the electric telescopic rod (20).

4. The Bluetooth headset testing device according to claim 1, characterized in that: Rotating limit grooves (14) are formed on both side surfaces of the protective adjustment groove (16). Rotating limit blocks (15) are arranged on both side surfaces of the adjustment rotating plate (17), and the rotating limit blocks (15) are located inside the rotating limit grooves (14). Both the rotating limit blocks (15) and the rotating limit grooves (14) are of a ring structure, and their cross-sections are both of a "匚" - shaped structure. The rotating limit grooves (14) and the rotating limit blocks (15) cooperate to limit the rotation of the adjustment rotating plate (17).

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