Inwardly folding rotating mechanism

Abstract

The application discloses an inner folding rotary mechanism, comprising a first folding mechanism and a second folding mechanism, wherein the bottom of the first folding mechanism and the second folding mechanism is connected with a screen, the upper part of the first folding mechanism and the second folding mechanism is provided with a connecting piece, the number of the first folding mechanism and the second folding mechanism is two, and two first folding mechanisms are symmetrically distributed on the two sides of two second folding mechanisms. The first gear, the synchronous gear shaft and the synchronous gear block are arranged, so that the two synchronous gear blocks can be synchronously moved during the folding of the screen, the synchronous compensation movement of the two compensation fixed blocks can be realized, the second gear and the gear groove are arranged, so that the compensation fixed block can be driven to fold and compensate when the synchronous gear block is turned over, the self-locking cam and the self-locking concave wheel are arranged, so that the folding self-locking of the first folding mechanism can be realized, and the folding angle of the screen can be conveniently adjusted.

Description

Technical Field

[0001] This invention relates to the field of inward folding rotation mechanism technology, specifically to an inward folding rotation mechanism. Background Technology

[0002] Foldable screens, as a type of flexible screen that can be bent significantly, can be used in electronic products to allow the entire product to be folded, thereby reducing the space occupied by the product. In recent years, with the rapid development of foldable screens, electronic products with folding functions have gradually come into people's view. Looking back at the development history of foldable screens, after solving the problem of how to fold them, foldable screens have entered the optimization stage, including three aspects: display, thickness, and user experience.

[0003] Because foldable screens have a separate rotating mechanism, electronic products using foldable screens have a more complex internal structure compared to traditional displays, and generally suffer from excessive weight. Therefore, improving the existing internal folding rotating mechanism, which has complex and space-consuming parts, has become one of the main ways to promote the development of foldable screens. In addition, the asynchronous bending of the two sides of the foldable screen increases the crease rate, resulting in a shorter lifespan. Another very important reason affecting the mainstream adoption of foldable screens is price. The rotating mechanism with a precision structure has a higher manufacturing cost, which in turn increases the cost of electronic products using foldable screens. Summary of the Invention

[0004] The purpose of this invention is to provide an inwardly folding rotating mechanism to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an inward folding rotating mechanism, comprising a first folding mechanism and a second folding mechanism, wherein a screen is connected to the bottom of the first folding mechanism and the second folding mechanism, and a connecting piece is provided above the first folding mechanism and the second folding mechanism, wherein there are two of each of the first folding mechanism and the second folding mechanism, and the two first folding mechanisms are symmetrically distributed on both sides of the two second folding mechanisms.

[0006] Preferably, the first folding mechanism includes a compensation fixing component, a synchronous gear block is provided inside the compensation fixing component, a support back plate is connected to one side of the synchronous gear block, a synchronous gear shaft is provided through the middle of the support back plate, a rotating shaft is provided through the support back plate and the synchronous gear block, nuts are connected to both ends of the rotating shaft, flat wire springs are sleeved on the outer side of both ends of the rotating shaft, a self-locking cam is sleeved on the outer side of the middle of the rotating shaft, a self-locking concave wheel is provided on the rotating shaft on one side of the self-locking cam, and a first gear is embedded in the bottom of the support back plate.

[0007] Preferably, a tooth groove is formed in a middle portion of the compensation fixing member, a second gear is disposed inside the tooth groove, a first fixing groove is formed on an upper surface of one side of the compensation fixing member, the compensation fixing member is concave, and the synchronous gear block is embedded inside the compensation fixing member.

[0008] Preferably, both ends of the sides of the support back plate and the synchronous gear block that are away from each other are provided with self-locking cam fixing grooves, middle portions of the support back plate and the synchronous gear block are both provided with self-locking concave wheel fixing grooves, a middle portion of both sides of the support back plate is in a first gear shape to form a crisscross shape, a middle portion of a side of the synchronous gear block close to the support back plate is in a first gear shape to form an F shape, there are two synchronous gear blocks, which are symmetrically distributed on both sides of the support back plate, a middle portion of a side of the synchronous gear block close to the support back plate meshes with the first gear, and the synchronous gear shaft penetrates through the first gear.

[0009] Preferably, the second gear is located inside the synchronous gear block, one side of the second gear meshes with a middle portion of both sides of the support back plate, and a bottom surface of the second gear meshes with the tooth groove.

[0010] Preferably, a side wall of the self-locking cam is connected with a fixing boss, a side of the self-locking concave wheel away from the self-locking cam is connected with a fixing pin, there are four self-locking cams and four self-locking concave wheels respectively, two of which form a group symmetrically distributed on front and rear sides of the support back plate, the self-locking cam and the self-locking concave wheel located on the front side of the support back plate are both installed in the synchronous gear block, and the self-locking cam and the self-locking concave wheel located on the rear side of the support back plate are both installed in the support back plate.

[0011] Preferably, the second folding mechanism comprises a semi-circular arc body, a semi-circular arc groove is formed inside the semi-circular arc body, rotating blocks are disposed on both sides of the semi-circular arc body, a moving member is disposed at an end of the rotating block away from the semi-circular arc body, second fixing grooves are penetratingly formed on both sides of an upper surface of the moving member, and a moving groove is formed in a middle portion of the moving member.

[0012] Preferably, the rotating block consists of a rectangular plate and a semi-cylinder, the rectangular plate and the semi-cylinder are connected integrally, movable bosses are connected to both sides of the rectangular plate, semi-circular grooves are formed on both sides of the semi-cylinder, and there are two rotating blocks, which are symmetrically arranged relative to the semi-circular arc body.

[0013] Preferably, the movable boss is integrally connected with the rotating block, cross sections of the movable boss and the moving groove are both inverted T-shaped, and the movable boss is clamped inside the moving groove to form a sliding connection.

[0014] Preferably, the semi-circular arc groove is clamped with the semi-circular groove, and the rotating block is inserted into the semi-circular arc groove to form a rotational connection with the semi-circular arc body.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This internal folding rotating mechanism, by setting a first gear, a synchronous gear shaft, and a synchronous gear block, drives two first gears to rotate during the screen folding process. The two first gears mesh with the two synchronous gear blocks respectively, driving the two synchronous gear blocks to move synchronously, thereby realizing synchronous compensation movement of the two compensation fixing blocks and ensuring that both sides of the screen fold synchronously.

[0017] 2. This internal folding rotating mechanism, by setting a second gear and a tooth groove, the second gear is installed inside the synchronous gear block and meshes with the tooth groove. Under the premise of saving the space occupied by the second gear, the rotation of the second gear drives the movement of the compensation fixed block, so as to drive the compensation fixed block to fold and compensate when the synchronous gear block flips.

[0018] 3. This internal folding rotating mechanism, by setting a self-locking cam and a self-locking concave wheel, both of which are inserted into the synchronous gear block and the support back plate, saves space. The self-locking cam and the concave wheel rotate and cooperate with each other to realize the folding self-locking function of the first folding mechanism, which makes it easy to adjust the folding angle of the screen.

[0019] 4. This inward folding rotating mechanism uses a semi-circular groove and a rotating block. One end of the rotating block is inserted into the semi-circular groove and rotates with the semi-circular body. The rotating block rotates in the semi-circular groove and drives the screen to fold through the moving parts. There is no need to use a rotating shaft connection. This reduces the production cost of the second folding mechanism while avoiding jamming when the screen rotates. Attached Figure Description

[0020] Figure 1 This is an overall structural unfolded view of the present invention;

[0021] Figure 2 This is a folded diagram of the overall structure of the present invention;

[0022] Figure 3 This is an overall structural diagram of the first folding mechanism of the present invention;

[0023] Figure 4 This is an exploded view of the overall structure of the first folding mechanism of the present invention;

[0024] Figure 5 This is an exploded view of the overall structure of the first folding mechanism of the present invention from the reverse side;

[0025] Figure 6 This is an exploded view of the self-locking structure of the first folding mechanism of the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of the second folding mechanism of the present invention;

[0027] Figure 8This is an exploded view of the overall structure of the second folding mechanism of the present invention.

[0028] The diagram is labeled as follows: 1. First folding mechanism; 10. Nut; 11. Flat wire spring; 12. Compensating fastener; 120. Gear groove; 121. Second gear; 122. First fixing groove; 13. Synchronous gear block; 14. Self-locking cam; 140. Fixing boss; 15. Self-locking concave wheel; 150. Fixing pin; 16. Synchronous gear shaft; 17. Support back plate; 170. Self-locking cam fixing groove; 171. Self-locking concave wheel fixing groove; 18. Rotating shaft core; 19. First gear; 2. Second folding mechanism; 20. Semicircular arc body; 200. Semicircular arc groove; 21. Rotating block; 210. Movable boss; 22. Moving part; 220. Moving groove; 221. Second fixing groove; 3. Screen; 4. Connecting piece. Detailed Implementation

[0029] 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.

[0030] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figures 1 to 8As shown, the internal folding rotating mechanism in this embodiment includes a first folding mechanism 1 and a second folding mechanism 2. Both the first folding mechanism 1 and the second folding mechanism 2 are used to support and fix the screen 3. The screen 3 is connected to the bottom of the first folding mechanism 1 and the second folding mechanism 2. A connecting piece 4 is provided above the first folding mechanism 1 and the second folding mechanism 2. The folding and locking of the rotating mechanism is realized by fixing the connecting piece 4. There are two first folding mechanisms 1 and two second folding mechanisms 2. The two first folding mechanisms 1 are symmetrically distributed on both sides of the two second folding mechanisms 2. The two first folding mechanisms 1 are located at the front and rear ends of the upper surface of the middle part of the screen 3, respectively. The second folding mechanism 2 is located between the two first folding mechanisms 1. The folding action of the first folding mechanism 1 and the second folding mechanism 2 realizes the folding function of the screen 3.

[0033] Specifically, the first folding mechanism 1 includes a compensation fixing member 12, inside which a synchronous gear block 13 is provided. There are two synchronous gear blocks 13 and two compensation fixing members 12, symmetrically arranged relative to the support back plate 17. One side of the synchronous gear block 13 is connected to the support back plate 17. A synchronous gear shaft 16 is passed through the middle of the support back plate 17, supporting the first gear 19. A rotating shaft core 18 is passed through between the support back plate 17 and the synchronous gear block 13. The rotating shaft core 18 is used for quick installation of the synchronous gear block 13 and the support back plate 17. Nuts 10 are connected to both ends of the rotating shaft core 18, and flat wire springs 11 are sleeved on the outer sides of both ends of the rotating shaft core 18. Both ends of the rotating shaft core 18 are threaded. A flat wire spring 11 is threadedly connected to a nut 10. Rotating the nut 10 drives it to move on a rotating shaft 18. When the nut 10 rotates on the rotating shaft 18, it compresses the flat wire spring 11, thereby adjusting the tightness of the connection between the synchronous gear block 13 and the support back plate 17. The rotating shaft 18 provides a movable connection between the support back plate 17 and the synchronous gear block 13, making the rotation mechanism easier to assemble and disassemble. A self-locking cam 14 is sleeved on the outer side of the middle part of the rotating shaft 18. A self-locking concave wheel 15 is provided on one side of the self-locking cam 14 on the rotating shaft 18. The self-locking cam 14 and the self-locking concave wheel 15 cooperate to realize the folding and self-locking function of the rotation mechanism. Two first gears 19 are embedded in the bottom of the support back plate 17 to realize the synchronous folding of the two synchronous gear blocks 13.

[0034] Further, a tooth groove (120) is provided in the middle of the compensation fixing member (12), a second gear (121) is arranged inside the tooth groove (120), a first fixing groove (122) is provided on the upper surface of one side of the compensation fixing member (12), the upper surface of the compensation fixing member (12) is connected to the electronic product screen (3) through the first fixing groove (122), the compensation fixing member (12) is concave-shaped, the synchronous gear block (13) is embedded inside the compensation fixing member (12), a clamping groove is provided in the middle of the compensation fixing member (12), and the synchronous gear block (13) is clamped inside the compensation fixing member (12) through the clamping groove.

[0035] Further, self-locking cam fixing grooves (170) are respectively provided at both ends of the sides of the support back plate (17) and the synchronous gear block (13) that are away from each other, for mounting self-locking cams (14); self-locking concave wheel fixing grooves (171) are respectively provided in the middle of the support back plate (17) and the synchronous gear block (13), for mounting self-locking concave wheels (15). The self-locking cams (14) and the self-locking concave wheels (15) are inserted into the synchronous gear block (13) and the support back plate (17), which saves space. The middle parts of both sides of the support back plate (17) are in a first gear shape and form a soil-shaped structure, and the middle parts of both sides of the support back plate (17) mesh with the second gear (121). The middle part of one side of the synchronous gear block (13) close to the support back plate (17) is in a first gear shape and forms an F-shaped structure, the F-shaped synchronous gear block (13) is embedded and butted with the soil-shaped support back plate (17), there are two synchronous gear blocks (13), which are symmetrically distributed on both sides of the support back plate (17), the middle part of one side of the synchronous gear block (13) close to the support back plate (17) meshes with the first gear (19), a synchronous gear shaft (16) penetrates the first gear (19), and the two synchronous gear blocks (13) realize synchronous folding through the first gear (19) and the synchronous gear shaft (16).

[0036] Further, the second gear (121) is located inside the synchronous gear block (13), an accommodation space is provided at the bottom of the synchronous gear block (13), and the second gear (121) is arranged in the accommodation space, which reduces the space occupied by the second gear (121), makes the structure of the rotating mechanism more compact and smaller in size. One side of the second gear (121) meshes with the middle parts of both sides of the support back plate (17), and the bottom surface of the second gear (121) meshes with the tooth groove (120). On the premise of meeting the requirement of synchronous compensation, the rotating mechanism is more convenient to disassemble and assemble, which saves cost.

[0037] Furthermore, a fixing boss 140 is connected to the side wall of the self-locking cam 14. The fixing boss 140 is fixed to the self-locking cam 14 by connecting to the self-locking cam fixing groove 170 in the synchronous gear block 13 and the support back plate 17. A fixing pin 150 is connected to the side of the self-locking concave wheel 15 away from the self-locking cam 14. The fixing pin is inserted into the self-locking concave wheel fixing groove 171 in the synchronous gear block 13 and the support back plate 17 to fix the self-locking concave wheel 15. There are four self-locking cams 14 and four self-locking concave wheels 15, which are symmetrically distributed in pairs on the support. On the front and rear sides of the back plate 17, the self-locking cam 14 is provided with a boss, and the self-locking concave wheel 15 is provided with a groove. The boss on the self-locking cam 14 and the groove on the self-locking concave wheel 15 rotate and engage, thereby realizing the folding and self-locking function of the rotating mechanism. The self-locking cam 14 and the self-locking concave wheel 15 located on the front side of the supporting back plate 17 are both installed in the synchronous gear block 13. When rotating, the self-locking cam 14 rotates. The self-locking cam 14 and the self-locking concave wheel 15 located on the rear side of the supporting back plate 17 are both installed in the supporting back plate 17. When rotating, the self-locking concave wheel 15 moves.

[0038] Furthermore, the second folding mechanism 2 includes a semi-circular arc body 20, with a semi-circular arc groove 200 inside the semi-circular arc body 20. The semi-circular arc groove 200 is used to connect the rotating block 21. A locking platform is provided inside the semi-circular arc groove 200. The locking platform is inserted into the rotating block 21 to limit the rotation block 21 and prevent the rotating block 21 from falling out of the semi-circular arc body 20. Rotating blocks 21 are provided on both sides of the semi-circular arc body 20. A moving part 22 is provided at the end of the rotating block 21 away from the semi-circular arc body 20. The moving part 22 is used to connect to the back of the electronic product screen 3. A second fixing groove 221 is provided through both sides of the upper surface of the moving part 22. The moving part 22 is connected to the electronic product screen 3 through the second fixing groove 221. The screen 3 is installed through the first fixing groove 122 and the second fixing groove 221, realizing the connection and fixation of the first folding mechanism 1, the second folding mechanism 2 and the screen 3. A moving groove 220 is provided in the middle of the moving part 22. The moving part 22 is connected to the rotating block 21 through the moving groove 220.

[0039] Furthermore, the rotating block 21 is composed of a rectangular plate and a semi-cylinder. The upper surfaces of the rectangular plate and the semi-cylinder are flush and integrally connected. Movable bosses 210 are connected to both sides of the rectangular plate, and semi-circular grooves are opened on both sides of the semi-cylinder. There are two rotating blocks 21, which are symmetrically arranged relative to the semi-circular body 20. The end of the rotating block 21 near the rectangular plate is connected to the moving part 22, and the end near the semi-cylinder is connected to the semi-circular body 20. The rotating blocks 21 are distributed on both sides of the semi-circular body 20 to drive the moving part 22 to rotate.

[0040] Furthermore, the movable boss 210 is integrally connected with the rotating block 21. Both the movable boss 210 and the moving groove 220 have an L-shaped cross section. After the movable boss 210 is inserted into the moving groove 220, the inner walls on both sides of the moving groove 220 limit the movable boss 210 vertically. The movable boss 210 is locked inside the moving groove 220 to form a sliding connection. On the one hand, the relative sliding of the moving part 22 and the rotating block 21 can be realized. By adjusting the position of the movable boss 210 in the moving groove 220, the screen 3 of different specifications of electronic products can be installed. On the other hand, when the rotating block 21 rotates, the screen 3 bends and drives the moving part 22 to slide relative to the rotating block 21. At this time, the moving part 22 moves outward to avoid movement obstruction.

[0041] Furthermore, the semi-circular groove 200 is engaged with the semi-circular groove, and the rotating block 21 is inserted into the semi-circular groove 200 to form a rotatable connection with the semi-circular body 20. When the rotating block 21 rotates, the semi-circular groove moves within the semi-circular groove 200. This connection structure does not require the use of a rotating shaft connection, which reduces the production cost of the rotating mechanism while avoiding jamming when the screen 3 rotates.

[0042] The usage method of this embodiment is as follows: The user first installs the first folding mechanism 1 and the second folding mechanism 2 onto the upper surface of the middle part of the screen 3 through the first fixing groove 122 and the second fixing groove 221, respectively, and installs the connecting piece 4 in the middle of the first folding mechanism 1 and the second folding mechanism 2. When folding the screen 3, the screen 3 drives the first folding mechanism 1 to fold. At this time, the synchronous gear block 13 flips and drives the first gear 19 to rotate. The first gear 19 rotates around the synchronous gear shaft 16, driving the two synchronous gear blocks 13 to flip synchronously. At the same time, the synchronous gear block 13 drives the second gear 121 to rotate relative to the supporting back plate 17. The wheel 121 rolls on the toothed groove 120, pushing the two sides of the compensation fixing member 12 to move synchronously. During this process, the boss on the self-locking cam 14 and the groove on the self-locking concave wheel 15 rotate and cooperate to complete the folding self-locking of the first folding mechanism 1. At the same time, the second folding mechanism 2 folds. The screen 3 drives the rotating block 21 to rotate through the moving member 22. The semi-circular groove slides in the semi-circular arc groove 200, causing the rotating block 21 to flip on both sides of the semi-circular arc body 20. At the same time, the movable boss 210 slides relative to the moving member 22 in the moving groove 220, completing the folding of the first folding mechanism 1 and the second folding mechanism 2.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An inward folding rotating mechanism, comprising a first folding mechanism (1) and a second folding mechanism (2), characterized in that: A screen (3) is connected to the bottoms of said first folding mechanism (1) and second folding mechanism (2), a connecting plate (4) is arranged above said first folding mechanism (1) and second folding mechanism (2), the number of said first folding mechanism (1) and said second folding mechanism (2) are both two, and two said first folding mechanisms (1) are symmetrically distributed on both sides of two said second folding mechanisms (2); Said first folding mechanism (1) comprises a compensation fixing member (12), a synchronous gear block (13) is arranged inside said compensation fixing member (12), a support back plate (17) is connected to one side of said synchronous gear block (13), a synchronous gear shaft (16) is penetratingly arranged in the middle of said support back plate (17), a rotating shaft core (18) is penetratingly arranged between said support back plate (17) and said synchronous gear block (13), both ends of said rotating shaft core (18) are connected with nuts (10), flat wire springs (11) are sleeved on outer sides of both ends of said rotating shaft core (18), a self-locking cam (14) is sleeved on an outer side of a middle portion of said rotating shaft core (18), a self-locking concave wheel (15) is arranged on said rotating shaft core (18) at one side of said self-locking cam (14), and a first gear (19) is embedded in the middle of said support back plate (17); A tooth groove (120) is formed in the middle of said compensation fixing member (12), a second gear (121) is arranged inside said tooth groove (120), a first fixing groove (122) is formed on an upper surface of one side of said compensation fixing member (12), said compensation fixing member (12) is concave-shaped, and said synchronous gear block (13) is embedded inside said compensation fixing member (12); Self-locking cam fixing grooves (170) are formed at both ends of mutually far sides of said support back plate (17) and two said synchronous gear blocks (13), self-locking concave wheel fixing grooves (171) adjacent to said self-locking cam fixing grooves (170) are formed on both said support back plate (17) and said synchronous gear block (13), said support back plate (17) is in a soil-shaped structure, said synchronous gear block (13) is F-shaped, two F-shaped said synchronous gear blocks (13) are symmetrically distributed on both sides of soil-shaped said support back plate (17), a gear-shaped structure meshed with said first gear (19) is arranged in a middle portion of one side of said synchronous gear block (13) close to said support back plate (17), and said synchronous gear shaft (16) penetrates said first gear (19); Said second gear (121) is located inside said synchronous gear block (13), a gear-shaped structure meshed with said second gear (121) is arranged in a middle portion of one side of said support back plate (17) close to said synchronous gear block (13), and a bottom surface of said second gear (121) is also meshed with said tooth groove (120); The self-locking cam (14) has a fixed boss (140) connected to its side wall, and the self-locking concave wheel (15) has a fixed pin (150) connected to the side away from the self-locking cam (14). There are four self-locking cams (14) and four self-locking concave wheels (15), which are symmetrically distributed on the front and rear sides of the support back plate (17) in pairs. The self-locking cams (14) and self-locking concave wheels (15) on the front side of the support back plate (17) are installed in the synchronous gear block (13), and the self-locking cams (14) and self-locking concave wheels (15) on the rear side of the support back plate (17) are installed in the support back plate (17).

2. The inward-folding rotating mechanism according to claim 1, characterized in that: The second folding mechanism (2) includes a semi-circular arc body (20), a semi-circular arc groove (200) is provided inside the semi-circular arc body (20), a rotating block (21) is provided on both sides of the semi-circular arc body (20), a moving part (22) is provided at the end of the rotating block (21) away from the semi-circular arc body (20), a second fixing groove (221) is provided through both sides of the upper surface of the moving part (22), and a moving groove (220) is provided in the middle of the moving part (22).

3. The inward-folding rotating mechanism according to claim 2, characterized in that: The rotating block (21) is composed of a rectangular plate and a semi-cylinder. The rectangular plate and the semi-cylinder are integrally connected. Movable bosses (210) are connected to both sides of the rectangular plate. Semi-circular grooves are opened on both sides of the semi-cylinder. There are two rotating blocks (21), which are arranged symmetrically relative to the semi-circular body (20).

4. The inward-folding rotating mechanism according to claim 3, characterized in that: The movable boss (210) is integrally connected with the rotating block (21). The cross-sections of the movable boss (210) and the moving groove (220) are both L-shaped. The movable boss (210) is locked inside the moving groove (220) to form a sliding connection.

5. The inward-folding rotating mechanism according to claim 2, characterized in that: The rotating block (21) is inserted into the semi-circular groove (200) and forms a rotating connection with the semi-circular body (20).

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