Multi-angle adjustable oral implant implantation positioner
Patent Information
- Application Number
- CN202411332930.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2026-10-13
AI Technical Summary
[0003]现有的口腔种植体植入工作中,需要在口腔指定位置钻孔,钻出种植体适配的安装槽,才能将种植体装入,若孔洞钻取位置不够准确或偏移,则种植牙可能无法完成安装或无法与原本牙齿匹配,造成种植失败的问题,且在对上颚进行种植体植入工作时,会因为患者口腔不自觉的张合导致钻孔或植入偏移,极大的提高了治疗难度
[0014]通过设置两个口腔定位套,可稳定的套设在患者的上下颚上,且两个口腔定位套之间设置有角度调节机构,两个口腔定位套通过角度调节机构可改变二者的角度,方便患者自己进行咬合佩戴,且在完成佩戴后,只需医生通过工具伸入患者口腔内并向外拉动勾环,解除对两个口腔定位套的锁定,此时患者便可自由的将口腔张开,张开过程中两个口腔定位套随患者上下颚的角度进行改变,直至张至合适角度后,医生松开勾环,两个弹簧的弹力作用下再次锁定两个口腔定位套,使两个口腔定位套的角度固定,此时患者自身也无法不自觉的口腔张合,医生便可以在稳定的口腔环境和种植角度进行种植体的种植工作,使用简单方便。
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Figure CN122894073A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical assistive device technology, and in particular to a multi-angle adjustable oral implant placement positioner. Background Technology
[0002] Dental implants, also known as dental implants or artificial tooth roots, are surgically implanted into the upper or lower jawbone at the site of tooth loss. After the surgical wound heals, a prosthetic tooth is attached to it. They consist of two parts: the lower supporting implant and the upper dental prosthesis. They are primarily used for the treatment of tooth defects and loss. Dental implants utilize a medical approach, precisely designed and manufactured from pure titanium metal with high biocompatibility, shaped like a tooth root (cylinder or other form). This implant is then guided and positioned into the alveolar bone in the edentulous area. Once the artificial tooth root has integrated with the alveolar bone, a porcelain crown is then fabricated on top of the artificial root.
[0003] In current dental implant procedures, it is necessary to drill holes in designated locations in the mouth to create mounting slots for the implant before it can be inserted. If the holes are not drilled accurately or are misaligned, the implant may not be able to be installed or may not match the original teeth, resulting in implant failure. Furthermore, when implanting implants in the maxilla, the patient's involuntary opening and closing of the mouth can cause drilling or implant misalignment, greatly increasing the difficulty of the treatment.
[0004] To address the above issues, we propose a multi-angle adjustable dental implant positioning device. Summary of the Invention
[0005] The purpose of this invention is to solve the problems in the background art by proposing a multi-angle adjustable oral implant positioning device.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-angle adjustable oral implant positioning device, comprising two oral positioning sleeves arranged opposite each other, the oral positioning sleeves being arranged according to the distribution of teeth in the oral cavity, and a rubber protective sleeve being fixedly connected to the far end of each of the two oral positioning sleeves; each of the two inner walls of the oral positioning sleeves having a sliding opening, and a V-shaped groove being formed at the end of each sliding opening near the rubber protective sleeve; a movable box being slidably fitted on the inner wall of each groove away from the groove; a spherical pulley being rotatably connected to the end of each movable box near the groove; the spherical pulley sliding in the corresponding groove; an L-shaped mounting block being fixedly connected to the far end of each of the two movable boxes located on the same oral positioning sleeve; an implant positioning component being provided at the end of the oral positioning sleeve away from the rubber protective sleeve; and friction textures being provided on the end face of each oral positioning sleeve away from the rubber protective sleeve.
[0007] An angle adjustment mechanism is provided between the two oral positioning sleeves. The angle adjustment mechanism includes an adjustment box. Both ends of the adjustment box are fixedly connected to a coaxially arranged central tube. A rotating column is rotatably connected to the inner wall of the end of each central tube away from the adjustment box. An arc-shaped opening is provided on the outer circumferential surface of each central tube at the position of the rotating column. A lower connector is fixedly connected between the outer circumferential surface of each central tube and the rear end of the lower oral positioning sleeve. Two upper connectors are fixedly connected to the rear end of the upper oral positioning sleeve. The ends of the two upper connectors away from the oral positioning sleeve pass through the two arc-shaped openings and are fixedly connected to the corresponding rotating columns.
[0008] In the aforementioned multi-angle adjustable oral implant positioning device, the oral positioning sleeve is U-shaped and set according to the distribution of teeth in the oral cavity.
[0009] In the aforementioned multi-angle adjustable oral implant positioning device, the implant positioning component includes a plate fixedly connected to the upper ends of two mounting blocks. A circular limiting opening is provided at the center of the upper end of the plate. Fixing blocks are fixedly connected to the center of both the front and rear ends of the plate. Metal plates are fixedly connected to the left and right ends of each of the two fixing blocks. The ends of the metal plates away from the fixing blocks extend above the oral positioning sleeve. A braking block near the friction groove is fixedly connected to the lower end of each metal plate. An inclined block is fixedly connected to the upper surface of each metal plate, with two corresponding inclined blocks arranged symmetrically on the left and right. The upper end of the plate is fixedly connected to... Four rectangular end blocks are provided. The two front end blocks are rotatably connected to a bidirectional threaded rod, and the two rear end blocks are fixedly connected to a sliding rod. Each of the bidirectional threaded rod and the sliding rod is fitted with two left-right distributed and corresponding movable sleeves. The movable sleeves are threaded to the bidirectional threaded rod and slidably connected to the sliding rod. A connecting rod is fixedly connected between every two front-rear opposite movable sleeves. A cylindrical push rod is fixedly connected to the end of each movable sleeve near the inclined block. The push rod extends to the corresponding inclined block and slides in contact with the inclined surface of the inclined block. The left end of the bidirectional threaded rod passes through the end block and is fixedly fitted with a rotating block.
[0010] In the above-mentioned multi-angle adjustable oral implant positioning device, each of the mounting blocks has a threaded hole at its upper end, and the flat plate is fixedly connected to the mounting block by bolts.
[0011] In the aforementioned multi-angle adjustable oral implant positioning device, a rotating rod is coaxially fixedly connected between two rotating columns. The rotating rod passes through an adjustment box, and a rotating wheel is fixedly sleeved on the rotating rod and inside the adjustment box. Multiple limiting slots are evenly distributed on the outer circumference of the rotating wheel. Two limiting rods are fixedly connected to the front end of the adjustment box, spaced apart to the left and right. A movable plate is slidably sleeved on the two limiting rods. A limiting insert plate is fixedly inserted through the center of the movable plate. The rear end of the limiting insert plate movably passes through the front end of the adjustment box and is inserted into the limiting slot located at the front. A limiting cap is fixedly connected to the front end of each of the two limiting rods. A spring is fixedly connected between the limiting cap and the movable plate. The two springs are respectively sleeved on the corresponding limiting rods. A hook ring is provided at the front end of the limiting insert plate.
[0012] In the above-mentioned multi-angle adjustable oral implant positioning device, the right end of the mounting block located on the right side is fixedly connected to a mounting seat with a U-shaped cross section. The mounting seat has corresponding insertion holes at both the front and rear ends. A crossbar is connected to the mounting seat by a pin. An arc-shaped baffle is fixedly connected to the end of the crossbar away from the mounting seat.
[0013] Compared to existing technologies, the advantages of this multi-angle adjustable dental implant positioning device are:
[0014] By using two oral positioning sleeves, the device can be stably fitted onto the patient's upper and lower jaws. An angle adjustment mechanism between the two sleeves allows for easy adjustment of their angle, facilitating proper bite placement by the patient. After placement, the dentist simply inserts a tool into the patient's mouth and pulls the hook outward to release the sleeves. The patient can then freely open their mouth. During this opening, the sleeves adjust to the angle of the patient's upper and lower jaws until a suitable angle is achieved. The dentist then releases the hook, and the spring force of the two springs locks the sleeves back in place, fixing their angle. At this point, the patient cannot involuntarily open or close their mouth, allowing the dentist to perform implant placement in a stable oral environment and at the correct angle. The device is simple and convenient to use.
[0015] By setting up a sliding opening, a moving box, spherical pulleys, mounting blocks, and implant positioning components, the implant positioning components can effectively help doctors limit the implantation site during implantation, avoiding implant displacement. Furthermore, the implant positioning components can move freely on the designated oral positioning sleeve as needed to find the designated implantation position, greatly facilitating the doctor's oral implantation work. Attached Figure Description
[0016] Figure 1This is a three-dimensional view of a multi-angle adjustable oral implant positioning device proposed in this invention;
[0017] Figure 2 This is a perspective view of the lower oral positioning sleeve in a multi-angle adjustable oral implant positioning device proposed in this invention.
[0018] Figure 3 for Figure 2 Enlarged structural diagram at point A;
[0019] Figure 4 This is a perspective view of the angle adjustment mechanism in a multi-angle adjustable oral implant positioning device proposed in this invention.
[0020] Figure 5 This is a three-dimensional view of a portion of the angle adjustment mechanism in a multi-angle adjustable oral implant positioning device proposed in this invention.
[0021] Figure 6 This is a perspective view of the upper positioning sleeve in a multi-angle adjustable oral implant positioning device proposed in this invention.
[0022] In the diagram: 1. Oral positioning sleeve, 2. Rubber protective sleeve, 3. Sliding opening, 4. Sliding groove, 5. Moving box, 6. Spherical pulley, 7. Mounting block, 8. Implant positioning assembly, 9. Flat plate, 10. Limiting opening, 11. Fixing block, 12. Metal plate, 13. Braking block, 14. Inclined block, 15. End block, 16. Bidirectional threaded rod, 17. Sliding rod, 18. Moving sleeve, 19. Push rod, 20. Connecting rod, 21. Rotating block, 22. Adjusting box, 23. Central tube, 24. Rotating column, 25. Arc-shaped opening, 26. Lower connector, 27. Upper connector, 28. Rotating rod, 29. Rotating wheel, 30. Limiting slot, 31. Limiting rod, 32. Movable plate, 33. Limiting insert plate, 34. Spring, 35. Mounting base, 36. Arc-shaped baffle. Detailed Implementation
[0023] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0024] Reference Figures 1-6 A multi-angle adjustable oral implant positioning device includes two upper and lower opposing oral positioning sleeves 1, which can be effectively fitted onto U-shaped teeth. The ends of the two oral positioning sleeves that are far apart are fixedly connected to rubber protective sleeves 2. The rubber protective sleeves 2 can wrap around the gums below the teeth after the oral positioning sleeves 1 are fitted onto the teeth. The softness of the rubber clamps the gums, thereby stabilizing the position of the oral positioning sleeves 1 and effectively preventing the upper oral positioning sleeve 1 from falling off.
[0025] The oral positioning sleeve 1 has sliding openings 3 on both inner walls. Each sliding opening 3 has a V-shaped groove 4 at its end near the rubber protective sleeve 2. A movable box 5 is slidably fitted onto the inner wall of each groove 4 away from the groove 4. A spherical pulley 6 is rotatably connected to the end of each movable box 5 near the groove 4. The spherical pulley 6 slides within the corresponding groove 4. Utilizing the sliding of the spherical pulley 6 within the groove 4 and the limiting effect of the inner wall of the sliding opening 3, the movable box 5 can move stably within the sliding opening 3 and cannot detach from it. Two movable boxes 5 located on the same oral positioning sleeve 1 have L-shaped mounting blocks 7 fixedly connected to their opposite ends. The movement of the movable box 5 allows the corresponding mounting blocks 7 to also move along the outside of the sliding opening 3 along the oral positioning sleeve 1. An implant positioning component 8 is provided at the end of the oral positioning sleeve 1 away from the rubber protective sleeve 2 for auxiliary positioning during implant placement. Each end face of the oral positioning sleeve 1 away from the rubber protective sleeve 2 has friction textures.
[0026] The implant positioning component 8 includes a flat plate 9 fixedly connected to the upper ends of two mounting blocks 7. The flat plate 9 can move on the oral positioning sleeve 1 via the two mounting blocks 7. A circular limiting opening 10 is provided at the center of the upper end of the flat plate 9. The limiting opening 10 allows the dentist to easily align the implant with the designated implant position after the flat plate 9 has moved above it, thus ensuring accurate implant placement. Fixing blocks 11 are fixedly connected to the center of both the front and rear ends of the flat plate 9. Metal plates 12 are fixedly connected to the left and right ends of the two fixing blocks 11. The metal plates 12 are made of shape memory metal, which has good deformation and recovery capabilities. The ends of the metal plates 12 away from the fixing blocks 11 extend above the oral positioning sleeve 1. A braking block 13 is fixedly connected to the lower end of each metal plate 12 near the friction groove. The braking block 13 is made of rubber material and has a high coefficient of friction. Each metal sheet 12 has a fixedly connected inclined block 14 on its upper end face. The two inclined blocks 14 on the left and right are symmetrically arranged. Under the condition that no external force is applied, each metal sheet 12 remains horizontal and each brake block 13 will not come into contact with the friction pattern.
[0027] Four rectangular end blocks 15 are fixedly connected to the upper end of the plate 9. A bidirectional threaded rod 16 is rotatably connected between the two front end blocks 15, and a sliding rod 17 is fixedly connected between the two rear end blocks 15. Two left-right distributed and corresponding movable sleeves 18 are fitted on both the bidirectional threaded rod 16 and the sliding rod 17. The movable sleeves 18 are threaded to the bidirectional threaded rod 16 and slidably connected to the sliding rod 17. A connecting rod 20 is fixedly connected between every two front-to-back movable sleeves 18, which can connect the two corresponding movable sleeves 18 together, so that they move synchronously. When the bidirectional threaded rod 16 rotates, the movable sleeves 18 on both sides can move relative to each other. A cylindrical push rod 19 is fixedly connected to one end of the movable sleeve 19 near the inclined block 14. The push rod 19 extends to the corresponding inclined block 14 and slides in contact with the inclined surface of the inclined block 14. The left end of the bidirectional threaded rod 18 passes through the end block 15 and is fixedly fitted with a rotating block 21.
[0028] Each mounting block 7 has a threaded hole at its upper end. The flat plate 9 is fixedly connected to the mounting block 7 by bolts. This design allows for easy removal of the implant positioning component 8 from the oral positioning sleeve 1, and subsequent repositioning to the upper or lower oral positioning sleeve 1 depending on the actual implant location. Specifically, after fixing the implant positioning component 8 to the designated oral positioning sleeve 1, the spherical pulley 6 can be used to move the implant positioning component 8 to the designated implant location. Then, rotating the rotating block 21 causes the rotation of the bidirectional threaded rod 18 to drive the push rods 19 on both sides to move relative to each other. The push rods 19 can move laterally along the inclined surface of the inclined block 14, thereby pushing the inclined block 14 downward and causing the metal plate 12 to bend downward, thus making the lower ends of the four braking blocks 13 tightly contact the friction texture, achieving a braking effect. At this point, the implant positioning component 8 can stop in that position. This work can be completed outside the oral cavity. The designated implant location can be found in advance, and then the oral positioning sleeve 1 can be placed into the patient's oral cavity.
[0029] An angle adjustment mechanism is provided between the two oral positioning sleeves 1. The angle adjustment mechanism includes an adjustment box 5. Both ends of the adjustment box 5 are fixedly connected to a coaxial central tube 23. The inner wall of the end of each central tube 23 away from the adjustment box 6 is rotatably connected to a rotating column 24. An arc-shaped opening 25 is opened on the outer circumference of each central tube 23 at the position of the rotating column 24. A lower connector 26 is fixedly connected between the outer circumference of each central tube 23 and the rear end of the lower oral positioning sleeve 1. Two upper connectors 27 are fixedly connected to the rear end of the upper oral positioning sleeve 1. The ends of the two upper connectors 27 away from the oral positioning sleeve 1 pass through the two arc-shaped openings 25 and are fixedly connected to the corresponding rotating columns 24. Through the setting of the angle adjustment mechanism, the two oral positioning sleeves 1 can rotate up and down with the two central tubes 23 as the axis, thereby changing the opening and closing angle. Under the limiting action of the arc-shaped openings 25, the range of the minimum and maximum included angles of the two oral positioning sleeves 1 can be controlled, making it easier to put the positioning device into the oral cavity and effectively attach it.
[0030] A rotating rod 28 is coaxially fixedly connected between the two rotating columns 24. The rotating rod 28 passes through the adjustment box 22. A rotating wheel 29 is fixedly sleeved on the rotating rod 28 and inside the adjustment box 22. The arrangement of the rotating wheel 29 and the rotating rod 28 allows them to rotate synchronously when the oral cavity positioning sleeve 1 located above rotates. Multiple limiting slots 30 are evenly distributed on the outer circumference of the rotating wheel 29. Two limiting rods 31, spaced apart to the left and right, are fixedly connected to the front end of the adjusting box 22. A movable plate 32 is slidably sleeved on the two limiting rods 31. A limiting insert plate 32 is fixedly inserted through the center of the movable plate 32. The rear end of the limiting insert plate 32 movably passes through the front end of the adjusting box 22 and is inserted into the limiting slot 30 located at the front. A limiting cap is fixedly connected to the front end of each of the two limiting rods 31. A spring 34 is fixedly connected between the limiting cap and the movable plate 32. The two springs 34 are respectively sleeved on the corresponding limiting rods 31. A hook ring is provided at the front end of the limiting insert plate 32. The setting of the spring 34 can ensure that the limiting insert plate 32 can always be inserted into the limiting slot 30 without the influence of external force. In this state, the rotating wheel 29 and the rotating rod 28 cannot rotate. Thus, the two oral positioning sleeves 1 cannot change angle, achieving the locking effect of the positioner.
[0031] Specifically, after the two oral positioning sleeves 1 are placed in the patient's mouth in a parallel position, the patient uses their own biting force to complete the biting and locking of the two oral positioning sleeves 1. Then, the doctor only needs to insert a tool into the patient's mouth and pull the hook outward to remove the limiting plate 32 from the limiting slot 30 and release the lock. At this time, the patient can open their mouth. During the opening process, the two oral positioning sleeves 1 change with the angle of the patient's upper and lower jaws until the appropriate angle is reached. After the doctor releases the hook, the limiting plate 32 can be reinserted into the limiting slot 30 at the front end under the elastic force of the two springs 34, and then lock the two oral positioning sleeves 1 again, fixing the angle of the two oral positioning sleeves 1. At this time, the patient cannot open and close their mouth unconsciously. The doctor can then perform the implant placement work with a stable oral environment and implant angle.
[0032] The mounting block 7 on the right side is fixedly connected to a U-shaped mounting base 35. The mounting base 35 has corresponding insertion holes at both ends. A crossbar is connected to the mounting base 35 by a pin. An arc-shaped baffle 36 is fixedly connected to the end of the crossbar away from the mounting base 35. The arc-shaped baffle 36 can effectively block the oral cavity wall on the side of the implant placement location, avoid obstructing the view of the implant placement location from the oral cavity, and further ensure a clear implantation environment.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A multi-angle adjustable oral implant positioning device, comprising two upper and lower opposing oral positioning sleeves (1), characterized in that, The oral positioning sleeve (1) is set according to the distribution of teeth in the oral cavity. The ends of the two oral positioning sleeves that are far apart are fixedly connected to rubber protective sleeves (2). The inner walls of both sides of the oral positioning sleeve (1) are provided with sliding openings (3). The end of each sliding opening (3) near the rubber protective sleeve (2) is provided with a V-shaped groove (4). The inner wall of each groove (4) away from the groove (4) is slidably fitted with a movable box (5). The end of each movable box (5) near the groove (4) is rotatably connected to a spherical pulley (6). The spherical pulley (6) slides in the corresponding groove (4). The ends of the two movable boxes (5) on the same oral positioning sleeve (1) that are far apart are fixedly connected to an L-shaped mounting block (7). The end of the oral positioning sleeve (1) away from the rubber protective sleeve (2) is provided with an implant positioning component (8). The end face of each oral positioning sleeve (1) away from the rubber protective sleeve (2) is provided with friction texture. An angle adjustment mechanism is provided between the two oral positioning sleeves (1). The angle adjustment mechanism includes an adjustment box (5). Both ends of the adjustment box (6) are fixedly connected to a coaxial central tube (23). The inner wall of the two central tubes (23) away from the adjustment box (6) is rotatably connected to a rotating column (24). An arc-shaped opening (25) is opened on the outer circumferential surface of the two central tubes (23) at the position of the rotating column (24). A lower connector (26) is fixedly connected between the outer circumferential surface of the two central tubes (23) and the rear end of the lower oral positioning sleeve (1). Two upper connectors (27) are fixedly connected to the rear end of the upper oral positioning sleeve (1). The ends of the two upper connectors (27) away from the oral positioning sleeve (1) pass through the two arc-shaped openings (25) and are fixedly connected to the corresponding rotating column (24).
2. The multi-angle adjustable oral implant positioning device according to claim 1, characterized in that, The oral positioning sleeve (1) is U-shaped and is set according to the distribution of teeth in the oral cavity.
3. The multi-angle adjustable oral implant positioning device according to claim 1, characterized in that, The implant positioning component (8) includes a plate (9) fixedly connected to the upper ends of two mounting blocks (7). A circular limiting opening (10) is provided at the center of the upper end of the plate (9). Fixing blocks (11) are fixedly connected to the center of both the front and rear ends of the plate (9). Metal plates (12) are fixedly connected to the left and right ends of the two fixing blocks (11). The end of the metal plate (12) away from the fixing block (11) extends to the top of the oral positioning sleeve (1). A braking block (13) close to the friction texture is fixedly connected to the lower end of each metal plate (12). An inclined block (14) is fixedly connected to the upper surface of each metal plate (12). The two inclined blocks (14) on the left and right are symmetrically arranged. Four rectangular end blocks (15) are fixedly connected to the upper end of the plate (9). The two end blocks located in front are... A bidirectional threaded rod (16) is rotatably connected between the end blocks (15). A slide rod (17) is fixedly connected between the two end blocks (15) located at the rear. Two movable sleeves (18) are sleeved on the bidirectional threaded rod (16) and the slide rod (17), which are distributed to the left and right and are corresponding to each other. The movable sleeves (18) are threaded to the bidirectional threaded rod (16) and slidably connected to the slide rod (17). A connecting rod (20) is fixedly connected between each pair of movable sleeves (18) that are opposite to each other. A cylindrical push rod (19) is fixedly connected to one end of the movable sleeve (19) near the inclined block (14). The push rod (19) extends to the corresponding inclined block (14) and slides in contact with the inclined surface of the inclined block (14). The left end of the bidirectional threaded rod (18) passes through the end block (15) and is fixedly sleeved with a rotating block (21).
4. The multi-angle adjustable oral implant positioning device according to claim 3, characterized in that, Each of the mounting blocks (7) has a threaded hole at its upper end, and the plate (9) is fixedly connected to the mounting block (7) by bolts.
5. The multi-angle adjustable oral implant positioning device according to claim 1, characterized in that, A rotating rod (28) is coaxially fixedly connected between the two rotating columns (24). The rotating rod (28) passes through the adjusting box (22). A rotating wheel (29) is fixedly sleeved on the rotating rod (28) and inside the adjusting box (22). Multiple limiting slots (30) are evenly opened on the outer circumference of the rotating wheel (29). Two limiting rods (31) are fixedly connected to the front end of the adjusting box (22) and are spaced apart from each other. A movable plate (32) is slidably sleeved on the two limiting rods (31). The movable plate (32) is fixedly penetrated by a limiting insert plate (32) at its center position. The rear end of the limiting insert plate (32) is movable through the front end of the adjusting box (22) and inserted into the limiting slot (30) located in front. The front ends of the two limiting rods (31) are fixedly connected to limiting caps. The limiting caps and the movable plate (32) are fixedly connected to a spring (34). The two springs (34) are respectively sleeved on the corresponding limiting rods (31). The front end of the limiting insert plate (32) is provided with a hook ring.
6. The multi-angle adjustable oral implant positioning device according to claim 1, characterized in that, The mounting block (7) located on the right side is fixedly connected to a mounting base (35) with a U-shaped cross section. The mounting base (35) has corresponding insertion holes at both the front and rear ends. A crossbar is connected to the mounting base (35) by a pin. An arc-shaped baffle (36) is fixedly connected to the end of the crossbar away from the mounting base (35).