A turnover device for processing a heater control panel
Patent Information
- Application Number
- CN202522004797.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-09-18
AI Technical Summary
[0003]本实用新型的目的在于提供一种取暖器控制板加工用翻转装置,通过设置翻转机构,具体是启动电机一带动齿轮一顺时针转动,因齿轮一与齿轮二啮合,齿轮二会逆时针转动,同时齿轮二通过圆管与左侧C形块固定,且控制板被四个夹持块固定,左侧和右侧C形块及自身的两个夹持块借助控制板构成一个整体,故左侧C形块随齿轮二逆时针转动,右侧C形块也同步转动,也可启动电机一逆时针转,使控制板顺时针转,此设置能够快速且精准地调节控制板的翻转角度,提高整体生产效率,解决了现有对控制板进行翻转大多通过人工手动进行,该方式不仅效率低、易导致控制板损伤,同时也难以精准调节控制板的翻转角度,导致难以适应于规模化生产的问题
1、本实用新型通过设置翻转机构,具体是启动电机一带动齿轮一顺时针转动,因齿轮一与齿轮二啮合,齿轮二会逆时针转动,同时齿轮二通过圆管与左侧C形块固定,且控制板被四个夹持块固定,左侧和右侧C形块及自身的两个夹持块借助控制板构成一个整体,故左侧C形块随齿轮二逆时针转动,右侧C形块也同步转动,也可启动电机一逆时针转,使控制板顺时针转,此设置能够快速且精准地调节控制板的翻转角度,提高整体生产效率。
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Figure CN224826460U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of heater control board processing technology, and in particular relates to a flipping device for processing heater control boards. Background Technology
[0002] A flipping device for processing heater control boards is a special automated equipment designed for the automated processing of heater control boards (containing precision electronic components such as resistors, chips, and pins, responsible for heater temperature regulation, power on / off functions, etc.). The core objective is to achieve precise flipping of the control board, adapt to double-sided processing requirements (such as double-sided SMT placement, double-sided soldering, double-sided inspection), while ensuring that the control board is undamaged and accurately positioned, replacing manual flipping to improve processing efficiency and product consistency. Traditionally, control panels are mostly flipped manually, which is inefficient and can easily damage the control panel during the flipping process. When it is necessary to precisely adjust the flipping angle of the control panel (such as when detecting defects in the control panel), manual flipping is difficult to meet the usage requirements. Therefore, this method is inefficient overall and difficult to adapt to large-scale production. To address this, we have proposed a flipping device for processing heater control panels. Utility Model Content
[0003] The purpose of this utility model is to provide a flipping device for processing heater control boards. By setting up a flipping mechanism, specifically, starting a motor one drives a gear one to rotate clockwise. Since gear one meshes with gear two, gear two will rotate counterclockwise. At the same time, gear two is fixed to the left C-shaped block through a round tube, and the control board is fixed by four clamping blocks. The left and right C-shaped blocks and their two clamping blocks form a whole with the help of the control board. Therefore, when the left C-shaped block rotates counterclockwise with gear two, the right C-shaped block also rotates synchronously. Alternatively, starting motor one to rotate counterclockwise can make the control board rotate clockwise. This setting can quickly and accurately adjust the flipping angle of the control board, improve the overall production efficiency, and solve the problem that most of the current flipping of control boards is done manually. This method is not only inefficient and prone to damaging the control board, but also difficult to accurately adjust the flipping angle of the control board, making it difficult to adapt to large-scale production.
[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a flipping device for processing a heater control board, comprising a base, two support boxes fixedly connected to the top of the base, and a square tube fixedly connected to one side of the two support boxes that are close to each other. It also includes: a flipping mechanism, which is located inside the left support box and is used to flip the control board; the flipping mechanism includes two round tubes, each with an anti-displacement ring fixedly connected to one side of the two round tubes that are close to each other; a gear two fixedly connected to the left side of the left round tube; and a gear one located inside the left support box; and a fixing mechanism, located on one side of the two support boxes that are close to each other, used to fix and release the control board; the two support boxes are symmetrically arranged, and the bottom of the square tube contacts the top of the base.
[0005] Furthermore, the flipping mechanism includes a motor, the left side of which is fixedly connected to the left side of the inner wall of the left support box; the support box on the left side is used to support and install the motor.
[0006] Furthermore, the fixing mechanism includes two C-shaped blocks, and two clamping blocks are provided on the inner side of the C-shaped blocks. The two clamping blocks are arranged symmetrically. The C-shaped blocks are C-shaped, and corrugated rubber pads are installed on the side of the two clamping blocks that are close to each other.
[0007] Furthermore, the right output end of the first motor is fixedly connected to the left side of the first gear, and a support column is fixedly connected to the right side of the first gear. The support column is rotatably connected to the right side of the inner wall of the left support box. The right side of the first gear contacts the right side of the inner wall of the left support box, and the support column is used to support the first gear.
[0008] Furthermore, the two C-shaped blocks are fixedly connected to the sides of the two circular tubes that are close to each other, the first gear and the second gear are meshed together, and the circular tubes are rotatably connected to the support box; the sides of the second gear and the anti-displacement ring on the left side are in contact with the right side of the inner wall and the right side of the outer surface of the left support box, respectively. This arrangement can prevent the circular tubes from shifting horizontally.
[0009] Furthermore, two limiting posts are fixedly connected to the two clamping blocks on the left side, which are far apart from each other. The two limiting posts are slidably limited by the C-shaped block. A spring is sleeved on the outside of the limiting post. One end of the spring is fixedly connected to the C-shaped block, and the other end of the spring is fixedly connected to the limiting post. The two clamping blocks are provided with inclined grooves inside. The inclined grooves are inclined, and the inclined directions of the inclined grooves in the two clamping blocks on the same side are opposite. Since the inclined directions of the inclined grooves in the two clamping blocks are opposite, when the two round rods squeeze the two inclined grooves respectively, the two clamping blocks will move closer to each other.
[0010] Furthermore, the fixing mechanism includes two movable rods, each with a connecting frame fixedly connected to one side of the two movable rods that are close to each other. Each connecting frame has two round rods fixedly connected to one side of the two connecting frames that are close to each other. The movable rods slide and limit the movement of the round tubes. A fixing ring is fixedly connected to the outer surface of each movable rod. A second spring is sleeved on the outer side of each movable rod. One end of the second spring is fixedly connected to the side of the gear two near the fixing ring, and the other end of the second spring is fixedly connected to the side of the fixing ring near the gear two. A spherical surface is provided at the end of the round rod that contacts the inclined groove. The second spring is used to push the movable rod to reset. The spherical surface at the end of the round rod that contacts the inclined groove can more smoothly compress the inclined groove. Even when the two movable rods are moved away from each other to their extreme positions, the two round rods connected to them still contact the inclined groove, thus preventing the round rods from leaving the inclined groove.
[0011] Furthermore, each of the two support boxes is equipped with a movable plate, and a bearing is fixedly connected inside the movable plate. The bearing is in sliding limit engagement with the movable rod. A limit rod is fixedly connected to the inner wall of the support box, and the movable plate is in sliding limit engagement with the limit rod. A bidirectional lead screw is rotatably connected inside the two support boxes. A second motor is fixedly connected to the left side of the left support box. The right output end of the second motor is fixedly connected to the left end of the bidirectional lead screw via a coupling. Both movable plates are slidably connected to the bidirectional lead screw. Two anti-displacement rings are fixedly connected to the outer surface of the bidirectional lead screw. The two anti-displacement rings are respectively in contact with the sides of the two support boxes that are close to each other. When the movable plate moves, the bearing inside it will push the fixed ring to move. When the movable rod rotates, it will rotate the bearing along with it. The bidirectional lead screw passes through the square tube.
[0012] This utility model has the following beneficial effects: 1. This utility model features a flipping mechanism. Specifically, starting motor one drives gear one to rotate clockwise. Since gear one meshes with gear two, gear two rotates counterclockwise. At the same time, gear two is fixed to the left C-shaped block through a round tube, and the control board is fixed by four clamping blocks. The left and right C-shaped blocks and their two clamping blocks form a whole with the help of the control board. Therefore, when the left C-shaped block rotates counterclockwise with gear two, the right C-shaped block also rotates synchronously. Alternatively, starting motor one to rotate counterclockwise will cause the control board to rotate clockwise. This design allows for quick and precise adjustment of the flipping angle of the control board, improving overall production efficiency.
[0013] 2. This utility model, through the setting of a fixing mechanism, specifically places the control board on top of the two clamping blocks below. Starting motor two drives the bidirectional lead screw to rotate clockwise, bringing the two moving plates closer together. The bearings inside the moving plates push the two moving rods and the connecting frame closer together. The round rod of the connecting frame presses against the inclined groove of the clamping block, thereby pushing the upper and lower clamping blocks closer together to fix the control board. Subsequently, starting motor two drives the bidirectional lead screw to rotate counterclockwise, moving the moving plates away from each other. Spring two pushes the moving rods back to their original position, the inclined groove is no longer under force, and spring one pushes the clamping block back to its original position, allowing the control board to be removed. This setting enables quick fixing and releasing of the control board, is convenient and fast, and can significantly improve processing efficiency.
[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the support box of this utility model; Figure 3 This is a schematic diagram of the inclined groove structure of this utility model; Figure 4 This is a schematic diagram of the support column structure of this utility model; Figure 5 This is a schematic diagram of the circular tube structure of this utility model.
[0017] The attached diagram lists the components represented by each number as follows: 1. Base; 11. Support box; 12. Square tube; 2. Tilting mechanism; 21. Motor 1; 211. Gear 1; 212. Support column; 22. Round tube; 221. Anti-displacement ring 1; 222. Gear 2; 3. Fixing mechanism; 31. C-shaped block; 32. Clamping block; 321. Limiting column; 322. Spring 1; 323. Inclined groove; 33. Moving rod; 331. Connecting frame; 332. Round rod; 333. Fixing ring; 334. Spring 2; 34. Moving plate; 341. Bearing; 342. Limiting rod; 35. Two-way lead screw; 351. Motor 2; 352. Anti-displacement ring 2. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figures 1-5As shown, this utility model is a flipping device for processing a heater control board, including a base 1, with two support boxes 11 fixedly connected to the top of the base 1. A square tube 12 is fixedly connected to one side of the two support boxes 11 that are close to each other. It also includes: a flipping mechanism 2, which is located inside the left support box 11 and is used to flip the control board. The flipping mechanism 2 includes two round tubes 22, each with an anti-displacement ring 221 fixedly connected to one side of the two round tubes 22 that are close to each other. A gear 222 is fixedly connected to the left side of the left round tube 22, and a gear 211 is located inside the left support box 11; a fixing mechanism 3, located on one side of the two support boxes 11 that are close to each other, is used to fix and release the control board. The two support boxes 11 are symmetrically arranged, with the bottom of the square tube 12 contacting the top of the base 1. The flipping mechanism 2 includes a motor 21, with the left side of the motor 21 fixedly connected to the left side of the inner wall of the left support box 11. The left support box 11 is used to support and install the motor 21. The fixing mechanism 3 includes two C-shaped blocks 31, and two clamping blocks 32 are arranged symmetrically on the inner side of the C-shaped blocks 31. The C-shaped blocks 31 are C-shaped, and corrugated rubber pads are installed on the sides of the two clamping blocks 32 that are close to each other. The right output end of the motor 21 is fixedly connected to the left side of the gear 211. A support column 212 is fixedly connected to the right side of the gear 211. The support column 212 is rotatably connected to the right side of the inner wall of the left support box 11. The right side of the gear 211 contacts the right side of the inner wall of the left support box 11, and the support column 212 is used to support the gear 211. The two C-shaped blocks 31, with their opposite sides facing away from each other, are fixedly connected to the opposite sides of the two circular tubes 22. Gear 1 211 meshes with Gear 2 222, and the circular tubes 22 are rotatably connected to the support box 11. When the motor 1 21 is started, it drives Gear 1 211 to rotate clockwise. Because Gear 1 211 meshes with Gear 2 222, Gear 2 222 will rotate counterclockwise. At the same time, Gear 2 222 is fixed to the left C-shaped block 31 through the circular tube 22, and the control board is fixed by four clamping blocks 32. The left and right C-shaped blocks... Block 31 and its two clamping blocks 32 form a whole with the help of the control board. Therefore, when the left C-shaped block 31 rotates counterclockwise with the gear 222, the right C-shaped block 31 also rotates synchronously. The motor 21 can also be started to rotate counterclockwise, so that the control board rotates clockwise. This setting can quickly and accurately adjust the flip angle of the control board and improve the overall production efficiency. The gear 222 and the anti-displacement ring 221 on the left side are close to each other and contact the right side of the inner wall of the left support box 11 and the right side of the outer surface, respectively.
[0020] On the left side, each of the two clamping blocks 32 is fixedly connected to a limiting post 321 on the side that is far apart from each other. Both limiting posts 321 are slidably limited by the C-shaped block 31. A spring 322 is sleeved on the outside of the limiting post 321. One end of the spring 322 is fixedly connected to the C-shaped block 31, and the other end of the spring 322 is fixedly connected to the limiting post 321. Both clamping blocks 32 have inclined grooves 323 inside. The inclined grooves 323 are inclined, and the inclination directions of the inclined grooves 323 inside the two clamping blocks 32 on the same side are opposite. The fixing mechanism 3 includes two movable rods 33. Each movable rod 33 is fixedly connected to a connecting frame 331 on one side close to each other. Each connecting frame 331 is fixedly connected to two round rods 332 on one side close to each other. The movable rods 33 are slidably limited to the round tube 22. A fixing ring 333 is fixedly connected to the outer surface of the movable rods 33. A second spring 334 is sleeved on the outer side of the movable rods 33. One end of the second spring 334 is fixedly connected to the side of the second gear 222 near the fixing ring 333. The other end of the second spring 334 is fixedly connected to the side of the fixing ring 333 near the second gear 222. A spherical surface is provided at the end of the round rod 332 that contacts the inclined groove 323. The second spring 334 is used to push the movable rod 33 to reset. Both support boxes 11 have a movable plate 34 inside, and a bearing 341 is fixedly connected inside the movable plate 34. The bearing 341 is slidably limited to the movable rod 33. A limit rod 342 is fixedly connected to the inner wall of the support box 11. The movable plate 34 is slidably limited to the limit rod 342. A bidirectional lead screw 35 is rotatably connected inside the two support boxes 11. A motor 351 is fixedly connected to the left side of the left support box 11. The right output end of the motor 351 is fixedly connected to the left end of the bidirectional lead screw 35 through a coupling. Both movable plates 34 are slidably connected to the bidirectional lead screw 35. Two anti-displacement rings 352 are fixedly connected to the outer surface of the bidirectional lead screw 35. Place the control board on top of the two clamping blocks 32 below, and start the motor 351 to drive the bidirectional lead screw. Rotating clockwise, the two moving plates 34 approach each other, and the bearings 341 inside push the two moving rods 33 and the connecting frame 331 closer together. The round rod 332 of the connecting frame 331 presses the inclined groove 323 of the clamping block 32, thereby pushing the upper and lower clamping blocks 32 closer together to fix the control plate. Then, the motor 351 is started to drive the bidirectional lead screw 35 to rotate counterclockwise, and the moving plates 34 move away from each other. The spring 334 pushes the moving rod 33 to reset, the inclined groove 323 is no longer under force, and the spring 322 pushes the clamping block 32 to reset, so the control plate can be removed. This setting can quickly fix and release the control plate, which is convenient and quick and can significantly improve processing efficiency. The two anti-displacement rings 352 on the side that are far apart from each other contact the two support boxes 11 on the side that are close to each other.
[0021] A specific application of this embodiment is as follows: In use, the control board is placed on top of the two clamping blocks 32 below, and then the motor 351 is started to drive the bidirectional lead screw 35 to rotate clockwise. Since both moving plates 34 are slidably connected to the bidirectional lead screw 35, the two moving plates 34 will move closer to each other. The C-shaped block 31 is rotatably connected to the support box 11 through the round tube 22, and the moving rod 33 is rotatably connected to the round tube 22. Therefore, when the two moving plates 34 move closer to each other, the bearings 341 inside the two moving plates 34 will push the two fixed rings 333 closer to each other. At this time, the two springs 334 are compressed, and thus... When the two connecting frames 331 are pushed closer to each other, the two round rods 332 on the connecting frame 331 will squeeze the inclined grooves 323 in the two clamping blocks 32 on the same side, and push the two clamping blocks 32 closer to each other to clamp and fix the control board. At this time, the spring 322 is squeezed, and when the clamping block 32 fixes the control board, the wavy rubber pad at the contact part with the control board will be squeezed and deformed. This can prevent the clamping block 32 from directly contacting the control board and causing damage to it, and can also increase the friction to make the fixation more secure. During the movement of the moving plate 34, the limiting rod 342 guides it to prevent it from rotating. When the control board needs to be rotated, start motor 21 to drive gear 211 to rotate clockwise. Since gear 211 meshes with gear 222, gear 222 will rotate counterclockwise. Since gear 222 is fixedly connected to the left C-shaped block 31 through the round tube 22, and the control board is fixed by four clamping blocks 32, the two C-shaped blocks 31 and its own two clamping blocks 32 are connected into a whole through the control board. Therefore, when gear 222 rotates counterclockwise with the left round tube 22 and C-shaped block 31, the right C-shaped block 31 will also rotate. At the same time, motor 21 can be started to rotate counterclockwise, so that the control board rotates clockwise. After rotating to the appropriate angle, motor 21 is turned off. After processing is completed, start motor 2 351 drives the bidirectional lead screw 35 to rotate counterclockwise. At this time, the two moving plates 34 will move away from each other and no longer squeeze the two moving rods 33. Then, the two springs 2 334 push the two moving rods 33 away from each other through their own elastic force. At this time, the inclined groove 323 is no longer squeezed and pushed by the round rod 332. The two springs 1 322 on the clamping block 32 push the clamping block 32 to reset through their own elastic force. At this time, the two clamping blocks 32 above no longer contact the control board, and then the control board can be removed. It should be noted that the control of motor 1 21 and motor 2 351 in this application can both be achieved by using a program set in the control panel and inputting relevant parameters as needed for automated control. This control method can be implemented using existing technologies, such as PLC.
[0022] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0023] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A flipping device for processing a heater control panel, comprising a base (1), wherein two support boxes (11) are fixedly connected to the top of the base (1), and a square tube (12) is fixedly connected to one side of the two support boxes (11) that are close to each other, characterized in that, Also includes: A flipping mechanism (2) is disposed inside the left support box (11). The flipping mechanism (2) is used to flip the control board. The flipping mechanism (2) includes two round tubes (22). Anti-displacement ring 1 (221) is fixedly connected to the side of the two round tubes (22) that are close to each other. Gear 2 (222) is fixedly connected to the left side of the round tube (22) located on the left side. Gear 1 (211) is disposed inside the support box (11) located on the left side. The fixing mechanism (3) is located on one side of the two support boxes (11) that are close to each other. The fixing mechanism (3) is used to fix and release the control board. The two support boxes (11) are symmetrically arranged, and the bottom of the square tube (12) is in contact with the top of the base (1).
2. The flipping device for processing a heater control board according to claim 1, characterized in that, The flipping mechanism (2) includes a motor (21), the left side of which is fixedly connected to the left side of the inner wall of the left support box (11); The support box (11) located on the left is used to support and install motor 1 (21).
3. The flipping device for processing a heater control board according to claim 2, characterized in that, The fixing mechanism (3) includes two C-shaped blocks (31), and two clamping blocks (32) are provided on the inner side of the C-shaped blocks (31). The two clamping blocks (32) are arranged symmetrically. The C-shaped block (31) is C-shaped, and the two clamping blocks (32) are fitted with wavy rubber pads on the side that is close to each other.
4. The flipping device for processing a heater control board according to claim 3, characterized in that, The right output end of the motor (21) is fixedly connected to the left side of the gear (211), and a support column (212) is fixedly connected to the right side of the gear (211). The support column (212) is rotatably connected to the right side of the inner wall of the left support box (11). The right side of the gear (211) contacts the right side of the inner wall of the left support box (11), and the support column (212) is used to support the gear (211).
5. A flipping device for processing a heater control board according to claim 4, characterized in that, The two C-shaped blocks (31) are fixedly connected to the two round tubes (22) on opposite sides, and the gear one (211) and gear two (222) are meshed and connected. The round tube (22) is rotatably connected to the support box (11). Among them, the gear two (222) and the anti-displacement ring one (221) located on the left side are in contact with the right side of the inner wall and the right side of the outer surface of the left support box (11), respectively.
6. A flipping device for processing a heater control board according to claim 3, characterized in that, Two limiting posts (321) are fixedly connected to the two clamping blocks (32) on the left side, which are far apart from each other. The two limiting posts (321) are slidably limited by the C-shaped block (31). A spring (322) is sleeved on the outside of the limiting post (321). One end of the spring (322) is fixedly connected to the C-shaped block (31), and the other end of the spring (322) is fixedly connected to the limiting post (321). The two clamping blocks (32) are provided with inclined grooves (323) inside. The inclined groove (323) is inclined, and the inclined grooves (323) in the two clamping blocks (32) on the same side are inclined in opposite directions.
7. A flipping device for processing a heater control board according to claim 6, characterized in that, The fixing mechanism (3) includes two movable rods (33). A connecting frame (331) is fixedly connected to the side of the two movable rods (33) that are close to each other. Two round rods (332) are fixedly connected to the side of the two connecting frames (331) that are close to each other. The movable rods (33) are slidably limited to the round tube (22). A fixing ring (333) is fixedly connected to the outer surface of the movable rods (33). A second spring (334) is sleeved on the outside of the movable rods (33). One end of the second spring (334) is fixedly connected to the side of the second gear (222) that is close to the fixing ring (333). The other end of the second spring (334) is fixedly connected to the side of the fixing ring (333) that is close to the second gear (222). The end of the round rod (332) that contacts the inclined groove (323) is provided with a spherical surface, and the second spring (334) is used to push the moving rod (33) to reset.
8. A flipping device for processing a heater control board according to claim 7, characterized in that, Both of the support boxes (11) are equipped with movable plates (34), and bearings (341) are fixedly connected inside the movable plates (34). The bearings (341) and movable rods (33) are slidably limited. Limit rods (342) are fixedly connected to the inner wall of the support box (11). The movable plates (34) and limit rods (342) are slidably limited. Both of the support boxes (11) are rotatably connected to bidirectional lead screws (35). The left side of the support box (11) on the left side is fixedly connected to a second motor (351). The right output end of the second motor (351) is fixedly connected to the left end of the bidirectional lead screw (35) through a coupling. Both movable plates (34) are slidably connected to the bidirectional lead screw (35). Two anti-displacement rings (352) are fixedly connected to the outer surface of the bidirectional lead screw (35). Among them, the two anti-displacement rings (352) are respectively in contact with the two support boxes (11) on the side that are close to each other.