Rotating shaft assembly, folding housing and electronic equipment

Abstract

This invention provides a rotating shaft device, comprising a rotating aid mechanism and a supporting mechanism. The rotating aid mechanism includes a base, a rotating mechanism rotatably connected to one side of the base, and a linkage mechanism. The linkage mechanism includes a first linkage assembly rotatably connected to one side of the base, with one end of the first linkage assembly slidably connected to the rotating mechanism away from the base. The supporting mechanism includes a side support member and a central support member rotatably connected to the side support member. The side support member away from the central support member is rotatably connected to the rotating mechanism via a first rotating rail and a first rotating groove. The central support member is movably connected to the base via an adjusting rod and an adjusting groove. The adjusting groove includes a first positioning section and a second positioning section. When the side support member and the central support member are in a flattened or folded state, the adjusting rod is positioned in the first positioning section or the second positioning section. This invention also provides a folding housing and an electronic device equipped with a rotating shaft device.

Description

Technical Field

[0001] This invention relates to the field of electronic devices, and more particularly to a pivot device for supporting a flexible screen, a folding housing provided with the pivot device, and an electronic device provided with the folding housing. Background Technology

[0002] With the development of display equipment, foldable flexible displays have emerged, and foldable screen devices equipped with these displays are becoming increasingly popular due to their unique shapes and diverse functions. Currently, foldable flexible displays employ both inward and outward folding schemes. Existing inward folding schemes generally include U-shaped and teardrop-shaped inward folding. In related technologies, foldable flexible displays in foldable screen devices typically use a hinge mechanism for support, meaning the hinge mechanism is located on the back of the foldable flexible screen.

[0003] Existing hinge devices typically employ a central support plate and two side support plates hinged to opposite sides of the central support plate. When the two side support plates and the central support plate are in a flattened state, the foldable flexible display screen unfolds to a flattened state along with the two side support plates; when the two side support plates and the central support plate are in a folded state, the foldable flexible display screen bends to a folded state along with the two side support plates. However, in existing technologies, the central support plate is generally fixedly connected to its base, meaning the central support plate cannot move relative to the base. This results in a small space formed by the central support plate and the two side support plates in the folded state for housing the foldable flexible display screen, leading to high bending stress on the foldable flexible display screen. This can easily cause display failure and reduce the reliability of the foldable flexible display screen. Summary of the Invention

[0004] This application provides a rotating shaft device, a folding housing equipped with the rotating shaft device, and an electronic device equipped with the folding housing.

[0005] This application provides a rotating shaft device, which includes a rotation-aiding mechanism and a support mechanism. The rotation-aiding mechanism includes a base, a rotating mechanism rotatably connected to one side of the base, and a linkage mechanism. The linkage mechanism includes a first linkage assembly rotatably connected to one side of the base, and the end of the first linkage assembly away from the base is slidably connected to the rotating mechanism. The support mechanism includes a side support member and a middle support member, which are rotatably connected. The side support member away from the middle support member is rotatably connected to the rotating mechanism through a first rotating rail and a first rotating groove. The middle support member is movably connected to the base through an adjusting rod and an adjusting groove. The adjusting groove includes a first positioning section and a second positioning section located at opposite ends. When the side support member and the middle support member are in a flattened state, the adjusting rod is positioned in the first positioning section. When the side support member and the middle support member are in a folded state, the adjusting rod is positioned in the second positioning section.

[0006] This application also provides a folding housing, which includes a pivot device and two frames. The pivot device is located between the two frames, and the opposite sides of the pivot device are respectively connected to the two frames.

[0007] This application also provides an electronic device, which includes a flexible screen, two frames and a hinge device. The hinge device is located between the two frames, and the opposite sides of the hinge device are respectively connected to the two frames. The flexible screen is connected to the front of the two frames and the front of the hinge device.

[0008] The central support member and side support member of the rotating shaft device of this invention are rotatably connected. The side support member is rotatably connected to the rotating mechanism, and the central support member is slidably connected to the base through the cooperation of an adjusting rod and an adjusting groove. During the folding process of the rotating shaft device, the side support member rotates relative to the rotating mechanism, the central support member rotates relative to the side support member, and the central support member slides and rotates relative to the base until the adjusting rod is positioned at the second positioning section. The central support member tilts relative to the base, increasing the space for accommodating the flexible screen and reducing the failure of the flexible screen during the folding or drop process. In the fully folded state, the pair of central support members and the pair of side support members form a teardrop-shaped receiving space, increasing the space of the bendable area for accommodating the flexible screen. This reduces the bending stress of the flexible screen, thereby avoiding display failure, improving the reliability of the flexible screen, and extending its service life. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below relate to some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0010] Figure 1 This is a three-dimensional structural schematic diagram of an electronic device in one embodiment of this application;

[0011] Figure 2 yes Figure 1 An exploded view of the folding housing and flexible screen of an electronic device.

[0012] Figure 3 yes Figure 2 An exploded view of the three-dimensional structure of the folded shell in the diagram;

[0013] Figure 4 yes Figure 3 An exploded three-dimensional structural diagram of the rotating shaft device in the diagram;

[0014] Figure 5 yes Figure 4 A three-dimensional structural diagram of the rotating shaft device from another perspective;

[0015] Figure 6 yes Figure 4 A three-dimensional exploded view of the supporting mechanism;

[0016] Figure 7 yes Figure 6 A three-dimensional structural diagram of the supporting mechanism from another perspective;

[0017] Figure 8 yes Figure 4 An enlarged view of the first folding mechanism in the middle;

[0018] Figure 9 yes Figure 8 An exploded three-dimensional structural diagram of the first folding mechanism in the diagram;

[0019] Figure 10 yes Figure 9 A further exploded diagram of the first folding mechanism in the diagram;

[0020] Figure 11 yes Figure 10 A further exploded schematic diagram of the first folding mechanism from another perspective;

[0021] Figure 12 yes Figure 10 An exploded three-dimensional structural diagram of the linkage mechanism, the first abutment, the second abutment, the first elastic element, the second elastic element, the positioning element, and a pair of connecting shafts.

[0022] Figure 13 yes Figure 12 An exploded three-dimensional structural diagram from another perspective of the linkage mechanism, the first abutment, the second abutment, the first elastic element, the second elastic element, the positioning element, and a pair of connecting shafts.

[0023] Figure 14 yes Figure 12 A three-dimensional structural diagram of the first connecting rod in the middle;

[0024] Figure 15 yes Figure 14 A three-dimensional structural diagram of the first link in the structure from another perspective;

[0025] Figure 16 yes Figure 12 A three-dimensional structural diagram of the second connecting rod in the diagram;

[0026] Figure 17 yes Figure 16 A three-dimensional structural diagram of the second link in the middle from another perspective;

[0027] Figure 18 yes Figure 12 A three-dimensional structural diagram of the third link in the diagram;

[0028] Figure 19 yes Figure 18 A three-dimensional structural diagram of the third link in the structure from another perspective;

[0029] Figure 20 yes Figure 12 A three-dimensional structural diagram of the fourth link in the diagram;

[0030] Figure 21 yes Figure 20 A three-dimensional structural diagram of the fourth link in the structure from another perspective;

[0031] Figure 22 yes Figure 8 A schematic diagram of the front structure of the first folding mechanism in the middle;

[0032] Figure 23 yes Figure 8 A three-dimensional sectional view of the first folding mechanism in the middle;

[0033] Figure 24 yes Figure 4 Enlarged three-dimensional view of the second folding mechanism in the diagram;

[0034] Figure 25 yes Figure 24 An exploded view of the three-dimensional structure of the second folding mechanism in the diagram;

[0035] Figure 26 yes Figure 25 An exploded three-dimensional structural diagram of the linkage mechanism, the first abutment, the second abutment, the first elastic element, and a pair of connecting shafts.

[0036] Figure 27 yes Figure 24 A schematic diagram of the front structure of the second folding mechanism in the diagram;

[0037] Figure 28 yes Figure 24 A three-dimensional sectional view of the second folding mechanism in the middle;

[0038] Figure 29 yes Figure 1 A sectional view along line A1-A1;

[0039] Figure 30 yes Figure 1 A sectional view along line B1-B1;

[0040] Figure 31 yes Figure 1 A sectional view along line C1-C1;

[0041] Figure 32 yes Figure 1 A sectional view along line D1-D1;

[0042] Figure 33 yes Figure 1 A sectional view along line E1-E1;

[0043] Figure 34 yes Figure 1 A sectional view along line F1-F1 in the middle;

[0044] Figure 35 yes Figure 2 A three-dimensional structural diagram of the partially folded shell in the middle;

[0045] Figure 36 yes Figure 35 An exploded view of the three-dimensional structure of the folded shell in the diagram;

[0046] Figure 37 yes Figure 36 Enlarged view of the rotating shaft device in the diagram;

[0047] Figure 38 yes Figure 37 A three-dimensional structural diagram of the rotating shaft device from another perspective;

[0048] Figure 39 yes Figure 37 A sectional view along line A2-A2;

[0049] Figure 40 yes Figure 37 A sectional view along line B2-B2;

[0050] Figure 41 yes Figure 37 A sectional view along line D2-D2;

[0051] Figure 42 yes Figure 37A sectional view along line E2-E2;

[0052] Figure 43 yes Figure 1 A three-dimensional structural diagram of the electronic device in its fully folded state;

[0053] Figure 44 yes Figure 43 An exploded view of the three-dimensional structure of the electronic equipment in the diagram;

[0054] Figure 45 yes Figure 43 A sectional view along line A3-A3;

[0055] Figure 46 yes Figure 43 Sectional view along line B3-B3;

[0056] Figure 47 yes Figure 43 A sectional view along line C3-C3;

[0057] Figure 48 yes Figure 43 A sectional view along line D3-D3;

[0058] Figure 49 yes Figure 43 Cross-sectional view along line E3-E3;

[0059] Figure 50 yes Figure 43 A sectional view along line F3-F3.

[0060] Explanation of main labels:

[0061] 100. Electronic equipment; 20. Folding housing; 21. Frame; 211. Front; 213. Back; 214. Side; 215. End face; 216. Mounting groove; 22. Rotating shaft device; 220. Connecting shaft; 2201. Shaft body; 2203. Cover; 2205. Snap-fit ​​groove; 221. Base; 2210. Adjusting rod; 222. Support bar; 2221. Guide rail; 223. First mounting part; 2232. First protrusion; 2233. First arc groove; 2234. Second protrusion; 2235. Second arc groove; 2236. First rotation aid groove; 2237. Second rotation aid groove; 224. Second mounting part; 2241. Support plate; 2242. Through hole; 2243. First anti-slip plate; 224 5. First anti-slip plate; 2245a. First shaft hole; 2246. Second anti-slip plate; 2247. Second anti-slip plate; 2247a. Second shaft hole; 2248. Positioning block; 2248a. First positioning surface; 2248b. Second positioning surface; 226. Third mounting part; 2262. Guide block; 23. Support mechanism; 231. Side support member; 2310. First rotating rail; 2311. Rotating hole; 2312. Support part; 2313. Side support plate; 2313a. Second front; 2313b. Second back; 2313c. Second side; 2314. Limiting block; 2315. Limiting groove; 2315a. First limiting section; 2315b. Second limiting section; 2316. Positioning block; 23 17. Positioning groove; 2317a. First end; 2317b. Second end; 234. Middle support member; 2340. Adjustment groove; 2341. First positioning section; 2342. Middle support plate; 2342a. First front; 2342b. First back; 2342c. First side; 2343. Second positioning section; 2344. Adjustment block; 2345. Middle section; 2346. Rotating shaft; 2347. Clearance opening; 236. Receiving space; 24. First folding mechanism; 24a. Second folding mechanism; 240. First abutment member; 241. First sleeve; 2410. First shaft hole; 242. First abutment cam; 2421. Third protrusion; 2423. Third recess; 244. First elasticity Components; 245, gasket; 2451, annular gasket; 2453, first connecting strip; 246, second abutting component; 2460, second abutting cam; 2461, second sleeve; 2465, second shaft hole; 2462, fourth protrusion; 2464, fourth recess; 248, second elastic component; 249, snap-fit ​​piece; 2491, C-shaped buckle; 2493, second connecting strip; 250, first rotating mechanism; 251, first rotating component; 2511, first arc track; 2512, first rotating part; 2514, first connecting part; 2515, first sleeve; 2515a, first shaft hole; 252, first connecting component; 2520, first sliding groove; 2521, first transition part; 2522, first rotating groove;2523, First guide slide; 2524, First clearance opening; 2525, First connecting hole; 2526, First guide groove; 2527, First positioning rod; 2528, First clearance opening; 253, First adapter shaft; 255, Second rotating mechanism; 256, Second rotating component; 2561, Second arc track; 2562, Second rotating part; 2564, Second connecting part; 2565, Second sleeve; 2565a, Second shaft hole; 257, Second connecting component; 2570, Second slide groove; 2571, Second adapter part; 2572, Second rotating groove; 2573, Second guide slide; 2574, Second clearance opening; 2575, Second connecting hole; 2576, Second guide groove; 2577, Second positioning rod; 257 8. Second clearance opening; 258. Second adapter shaft; 261. First connecting rod assembly; 262. First connecting rod member; 2620. First slide rail; 2621. First rotating part; 2622. First connecting bar; 2623. First limiting rod; 2624. First rotating hole; 2625. First connecting rod part; 2626. First cam; 2626a. First protrusion; 2626b. First recess; 2627. First anti-slip groove; 2633. First abutting spiral surface; 2634. Second abutting spiral surface; 2637. Third abutting spiral surface; 2638. Fourth abutting spiral surface; 264. Second connecting rod member; 2640. Second slide rail; 2641. Second rotating part; 2642. Second connecting bar; 2644. 2645. Second rotating hole; 2646. Second connecting rod portion; 2646. Second cam; 2646a. Second protrusion; 2646b. Second recess; 2647. Second anti-slip groove; 265. Second connecting rod assembly; 266. Third connecting rod; 2660. Third slide rail; 2661. Third rotating portion; 2662. Third connecting bar; 2663. Second limiting rod; 2664. Third rotating hole; 2665. Third connecting rod portion; 2666. Third cam; 2666a. Third protrusion; 2666b. Third recess; 2667. Third anti-slip groove; 268. Fourth connecting rod; 2680. Fourth slide rail; 2681. Fourth rotating portion; 2682. Fourth connecting bar; 2684. Fourth rotating hole; 2685. 2686, Fourth cam; 2686a, Fourth protrusion; 2686b, Fourth recess; 2687, Fourth anti-slip groove; 27, Positioning component; 272, Positioning part; 2721, Third arc groove; 275, Connecting part; 2724, Connecting post; 276, Guide groove; 28, Linkage component; 281, First sliding part; 2811, First sliding hole; 283, Second sliding part; 2831, Second sliding hole; 2841, First helical surface; 2842, Second helical surface; 2843, Third helical surface; 2844, Fourth helical surface; 285, Connecting part; 2852, Guide groove; 29, Back shell; 291, Positioning part; 293, Positioning post; 30, Flexible screen; 31, Bendable area;33. Non-bending area. Detailed Implementation

[0062] 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.

[0063] Furthermore, the following descriptions of various embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used in this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying illustrations. Therefore, the use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," and "set on" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] Please refer to the following: Figures 1 to 7In one embodiment of the present invention, the electronic device 100 includes a folding housing 20 and a flexible screen 30 disposed on the folding housing 20. The flexible screen 30 can be bent or flattened with the folding housing 20. The folding housing 20 includes two frames 21 and a pivot device 22. The pivot device 22 is located between the two frames 21, and the opposite sides of the pivot device 22 are respectively connected to the two frames 21. The flexible screen 30 is connected to the front of the two frames 21 and the front of the pivot device 22. The rotating shaft device 22 includes a support mechanism 23, a first folding mechanism 24, and a back shell 29. The first folding mechanism 24 is disposed between the back shell 29 and the support mechanism 23. The first folding mechanism 24 includes a base 221, a rotating mechanism rotatably connected to one side of the base 221, and a linkage mechanism. The linkage mechanism includes a first link assembly 261 and a second link assembly 265. The first link assembly 261 is rotatably connected to one side of the base 221, and the second link assembly 265 is rotatably connected to the opposite side of the base 221. The end of the first link assembly 261 away from the base 221 is slidably connected to one of the rotating mechanisms, and the end of the second link assembly 265 away from the base 221 is slidably connected to the other rotating mechanism. The support mechanism 23 includes a side support member 231 and a middle support member 234. The side support member 231 and the middle support member 234 are rotatably connected. The side of the side support member 231 away from the middle support member 234 is rotatably connected to the rotating mechanism through the cooperation of a first rotating rail 2310 and a first rotating groove. The rotation axis between the middle support member 234 and the side support member 231 is parallel to the rotation axis between the side support member 231 and the rotating mechanism. The middle support member 234 and the base 221 are connected by an adjusting rod 2210. The joint groove 2340 is movably connected, and the axis of the adjusting rod 2210 is parallel to the rotation axis between the central support member 234 and the side support member 231. The adjusting groove 2340 includes a first positioning section 2341 and a second positioning section 2343 located at its opposite ends. When the side support member 231 and the central support member 234 are in a flattened state, the adjusting rod 2210 is positioned in the first positioning section 2341; when the side support member 231 and the central support member 234 are in a folded state, the adjusting rod 2210 is positioned in the second positioning section 2343. The flexible screen 30 includes a bendable area 31 corresponding to the rotating shaft device 22, and two non-bendable areas 33 connected to opposite sides of the bendable area 31. The two non-bendable areas 33 of the flexible screen 30 can be fixed to the front of the two frames 21 respectively, and the bendable area 31 is attached to the front of the rotating shaft device 22. The bendable area 31 of the flexible screen 30 can be bent or flattened with the rotating shaft device 22. The flexible screen 30 can be, but is not limited to, flexible display screens, flexible touch screens, flexible touch display screens, and other flexible components with corresponding functions, or flexible components that are fixedly attached to a flexible support plate, such as flexible display screens and flexible touch screens attached to flexible steel plates.

[0065] Specifically, the folding mechanism includes a first folding mechanism 24 and a second folding mechanism 24a. The back of the support mechanism 23 is provided with at least one first folding mechanism 24 and at least one second folding mechanism 24a, spaced apart from each other. In this embodiment, the back of the support mechanism 23 is provided with two first folding mechanisms 24 and one second folding mechanism 24a, wherein one first folding mechanism 24 and the second folding mechanism 24a are located at opposite ends of the support mechanism 23, and the other first folding mechanism 24 is located between one of the first folding mechanisms 24 and the second folding mechanism 24a. There is a gap between the second folding mechanism 24a and the adjacent first folding mechanism 24, the gap being used for the insertion of components such as flexible circuit boards. In other embodiments, the back of the support mechanism 23 may also have only one first folding mechanism 24 and one second folding mechanism 24a, respectively located at opposite ends of the support mechanism 23, with a gap between the first folding mechanism 24 and the second folding mechanism 24a. The first folding mechanism 24 and the second folding mechanism 24a each have a rotating mechanism, which includes a first rotating mechanism 250 and a second rotating mechanism 255. The first rotating mechanism 250 and the second rotating mechanism 255 are rotatably connected to opposite sides of the base 221. The support mechanism 23 includes a pair of side support members 231 and a pair of central support members 234. The pair of central support members 234 are located between the pair of side support members 231. Each side support member 231 is rotatably connected to the adjacent central support member 234. The side of one side support member 231 away from the central support member 234 is rotatably connected to the first rotating mechanism 250 through the cooperation of a first rotating rail 2310 and a first rotating groove 2522. The side of the other side support member 231 away from the central support member 234 is rotatably connected to the second rotating mechanism 255 through the cooperation of a first rotating rail 2310 and a second rotating groove 2572. The rotation axes between each side support 231 and the corresponding middle support 234, the rotation axis between the first rotation mechanism 250 and the corresponding side support 231, the rotation axis between the second rotation mechanism 255 and the corresponding side support 231, and the rotation axes between the first rotation mechanism 250 and the second rotation mechanism 255 and the base 221 are parallel to each other; a pair of middle supports 234 are located on opposite sides of the base 221, and the pair of middle supports 234 and the base 221 are movably connected by adjusting rods 2210 and adjusting grooves 2340 respectively; when the pair of side supports 231 and the pair of middle supports 234 are in a flattened state, the two adjusting rods 2210 are respectively positioned in two first positioning sections 2341; when the pair of side supports 231 and the pair of middle supports 234 are in a folded state, the two adjusting rods 2210 are respectively positioned in two second positioning sections 2343.

[0066] In this embodiment, the front side refers to the side facing the same direction as the light-emitting surface of the flexible screen 30, and the back side refers to the side facing away from the light-emitting surface of the flexible screen 30. The electronic device 100 is, for example, but not limited to, mobile phones, tablets, monitors, LCD panels, OLED panels, televisions, smartwatches, VR headsets, automotive displays, and any other products and components with display functions.

[0067] In this invention, the central support member 234 of the support mechanism 23 of the rotating shaft device 22 is rotatably connected to the side support member 231, the side support member 231 is rotatably connected to the rotating mechanism, and the central support member 234 is slidably connected to the base 221 through the cooperation of the adjusting rod 2210 and the adjusting groove 2340. During the folding process of the rotating shaft device 22, the side support member 231 rotates relative to the rotating mechanism, the central support member 234 rotates relative to the side support member 231, and the central support member 234 slides and rotates relative to the base 221 until the adjusting rod 2210 is positioned at the second positioning section 2343, and the central support member 234 tilts relative to the base 221, which increases the space for accommodating the flexible screen 30 and reduces the failure of the flexible screen 30 of the electronic device 100 during the folding process or drop. Specifically, in the fully folded state, the pivot device 22 allows a pair of central support members 234 to rotate relative to a pair of side support members 231, and the central support members 234 to rotate and slide relative to the base 221, so that the pair of central support members 234 and the pair of side support members 231 form a teardrop-shaped receiving space 236 (e.g., Figure 45 As shown, the accommodating space 236 is increased to fully accommodate the bendable area 31 of the flexible screen 30. This means the bendable area 31 can be lowered into the accommodating space 236 without its back side touching the support mechanism 23. This reduces the bending stress on the flexible screen 30, preventing display failure, improving its reliability, and extending its lifespan. Alternatively, the bending angle R of the bendable area 31 in the teardrop shape can be increased during the thinning and narrowing of the pivot device 22 (e.g., ...). Figure 45 As shown in the figure, this is to prevent the flexible screen 30 from breaking or delaminating during the bending process due to the bending angle R being too small and the transition being too abrupt, thereby affecting the display function.

[0068] like Figures 4-7As shown, the adjustment groove 2340 is disposed on the back of the central support member 234. The first positioning segment 2341 is closer to the side support member 231 than the second positioning segment 2343. The adjustment rod 2210 is disposed on the base 221, and the axis of the adjustment rod 2210 is parallel to the rotation axis between the central support member 234 and the side support member 231. In this embodiment, the first positioning segment 2341 of the adjustment groove 2340 on the back of each central support member 234 is close to the adjacent side support member 231, and the second positioning segment 2343 is away from the adjacent side support member 231. Specifically, the central support member 234 includes a rectangular central support plate 2342. The central support plate 2342 includes a first front side 2342a, a first back side 2342b, and two first side sides 2342c located on opposite sides of the central support plate 2342. The first back surface 2342b of the central support member 234 is provided with a strip-shaped adjusting block 2344. The length direction of the adjusting block 2344 is perpendicular to the length direction of the central support plate 2342. The opposite ends of the adjusting block 2344 are located on opposite sides of the central support member, that is, the opposite ends of the adjusting block 2344 extend to the two first side surfaces 2342c of the central support plate 2342. An adjusting groove 2340 is formed in the adjusting block 2344. The adjusting groove 2340 also includes an intermediate section 2345 connecting the first positioning section 2341 and the second positioning section 2343. The adjusting rod 2210 can move in the intermediate section 2345 to the first positioning section 2341 or the second positioning section 2343. Specifically, the adjustment groove 2340 is an arc-shaped groove, and the adjustment groove 2340 is opened on one side of the adjustment block 2344. The adjustment groove 2340 may or may not pass through the opposite middle side of the adjustment block 2344. The adjustment groove 2340 extends curvedly from the first positioning section 2341 to the second positioning section 2343. The first positioning section 2341 is closer to the first front face 2342a of the middle support plate 2342 than the second positioning section 2343. The opposite ends of the middle section 2345 are respectively connected to the first positioning section 2341 and the second positioning section 2343.

[0069] In this embodiment, the first back surface 2342b of the central support plate 2342 is provided with three pairs of mutually spaced adjusting blocks 2344. The space between each pair of adjusting blocks 2344 is used to accommodate a base 221 of a folding mechanism. Therefore, the two first folding mechanisms 24 and one second folding mechanism 24a in this embodiment are respectively housed between the three pairs of adjusting blocks 2344. Each base 221 has a pair of adjusting rods 2210 at its opposite ends, and the pair of adjusting rods 2210 are respectively inserted into the two adjusting slots 2340 corresponding to a pair of central support members 234. In other embodiments, the first back surface 2342b of the central support plate 2342 is provided with two pairs of mutually spaced adjusting blocks 2344. The two pairs of adjusting blocks 2344 are respectively located at the opposite ends of the central support plate 2342. The two bases 221 are respectively housed between the two pairs of adjusting blocks 2344, and the adjusting rods 2210 on the bases 221 are respectively inserted into the corresponding adjusting slots 2340. Understandably, the number of adjustment blocks 2344 on the first back side 2342b of the central support plate 2342 is the same as the number of auxiliary rotation mechanisms on the back side of the support mechanism 23.

[0070] In other embodiments, the base 221 is provided with an adjustment groove 2340, and the middle support member 234 is provided with an adjustment rod 2210, which is slidably and rotatably inserted into the adjustment groove 2340.

[0071] The central support member 234 and the adjacent side support member 231 are rotatably connected by a rotating shaft and a rotating hole. The rotating shaft is located on one of the central support member 234 and the side support member 231, and the rotating hole is located on the other. The axis of the rotating shaft is collinear with the axis of rotation between the central support member 234 and the side support member 231. In this embodiment, the first back surface 2342b of the central support member 234 is provided with a rotating shaft 2346, and the side support member 231 is provided with a rotating hole 2311. The rotating shaft 2346 is rotatably inserted into the rotating hole 2311. Specifically, each adjusting block 2344 has a rotating shaft 2346 at one end adjacent to the adjacent side support member 231. The central support plate 2342 has a clearance opening 2347 on its first side 2342c near the adjacent side support member 231. Specifically, the first side 2342c has a clearance opening 2347 near each rotation axis 2346. In this embodiment, the first side 2342c has six clearance openings 2347.

[0072] Optionally, the side support member 231 includes a support portion 2312, which is located on the side of the side support member 231 near the central support member 234. The support portion 2312 supports the back of the central support member 234. The adjusting block 2344 and the support portion 2312 are rotatably connected via a rotating shaft 2346 and a rotating hole 2311. The rotating shaft 2346 is located on one of the adjusting block 2344 and the support portion 2312, and the rotating hole 2311 is located on the other. In this embodiment, the rotating hole 2311 is located on the support portion 2312, and the rotating shaft 2346 is rotatably inserted into the rotating hole 2311. Specifically, the side support member 231 includes a rectangular side support plate 2313, which includes a second front side 2313a, a second back side 2313b, and two second side sides 2313c located on opposite sides of the side support plate 2313. The support portion 2312 is a support block protruding from the side support plate 2313 near the central support member 234. Multiple support blocks are provided on the side support plate 2313, and each support portion 2312 corresponds to a multiple adjusting block 2344. In this embodiment, six support portions 2312 are provided on the side of the side support plate 2313 facing the central support member 234. Each support portion 2312 has a support surface 2312a, which supports the back side of the central support member 234 when the central support member 234 and the side support member 231 are flattened.

[0073] The side support 231 and the first connector 252 are rotatably connected by a first rotating rail and a first rotating groove. The first rotating rail is located on one of the side support 231 and the first connector 252, and the first rotating groove is located on the other of the side support 231 and the first connector 252. In this embodiment, the first rotating rail 2310 is located on the side of the second back surface 2313b of the side support 231 away from the central support 234. The first rotating rail 2310 is an arc rail, and its axis is parallel to the axis of the rotating hole 2311. In this embodiment, three pairs of first rotating rails 2310 are provided on the side of the second back surface 2313b away from the central support 234. The three pairs of first rotating rails 2310 are coaxial. Specifically, one pair of first rotating rails 2310 is provided at each of the opposite ends of the side support 231, and another pair of first rotating rails 2310 is provided in the middle of the side support 231. The second back surface 2313b of the side support member 231 is provided with a limiting block 2314 between each pair of first rotating rails 2310. One side of the limiting block 2314 is provided with an arc-shaped limiting groove 2315. The limiting groove 2315 includes a first limiting segment 2315a and a second limiting segment 2315b located at opposite ends. The first limiting segment 2315a is farther away from the central support member 234 than the second limiting segment 2315b. That is, the first limiting segment 2315a is farther away from one side of the support part 2312 than the second limiting segment 2315b. The first limiting segment 2315a is also farther away from the second front surface 2313a of the side support member 231 than the second limiting segment 2315b. The second back surface 2313b of the side support member 231 is provided with a positioning block 2316. One side of the positioning block 2316 is provided with an arc-shaped positioning groove 2317. The positioning groove 2317 includes a first end 2317a and a second end 2317b located at opposite ends. The first end 2317a is further away from the back surface of the side support member 231 than the second end 2317b. That is, the first end 2317a is far away from the second back surface 2313b of the side support plate 2313, and the second end 2317b is close to the second back surface 2313b of the side support plate 2313.

[0074] like Figure 3As shown, the frame 21 includes a front face 211, a back face 213, two opposite sides 214, and two end faces 215. A pivot device 22 connects the two adjacent sides 214 of the two frames 21. The bendable area 31 of the flexible screen 30 is attached to the front face of the pivot device 22, and the non-bendable area 33 of the flexible screen 30 is connected to the front face 211 of the frame 21. Each frame 21 has a mounting groove 216 on the side of its front face 211 near the pivot device 22. The mounting groove 216 passes through the front face 211 of the frame 21, and its opposite ends extend to opposite end faces 215 near the frame 21. The opposite sides of the pivot device 22 are respectively accommodated in the mounting grooves 216 of the two frames 21. Optionally, the back face 213 of the frame 21 near the pivot device 22 has multiple connecting holes, each connecting hole connecting to the mounting groove 216, and the multiple connecting holes are arranged along the length of the mounting groove 216. The back of the frame 21 has several storage spaces (not shown in the figure) for installing electronic devices such as circuit boards, batteries, speakers, earpieces, cameras or buttons.

[0075] like Figures 9-11 As shown, the base 221 is elongated and includes a support bar 222. The support bar 222 is provided with a first mounting part 223, a second mounting part 224 and a third mounting part 226. The first mounting part 223 and the second mounting part 224 are located at opposite ends of the support bar 222, and the third mounting part 226 is located between the first mounting part 223 and the second mounting part 224. Specifically, on the front side of the first mounting part 223 away from the second mounting part 224, a first protrusion 2232 and a second protrusion 2234 are respectively provided on opposite sides. The side of the first protrusion 2232 facing the third mounting part 226 is provided with a first arc groove 2233, and the end of the first arc groove 2233 passes through the front side of the first protrusion 2232. The side of the second protrusion 2234 facing the third mounting part 226 is provided with a second arc groove 2235, and the end of the second arc groove 2235 passes through the front side of the second protrusion 2234. The axis of the first arc groove 2233 is parallel to the axis of the second arc groove 2235. The front side of the first mounting part 223 is provided with a first auxiliary rotation groove 2236 and a second auxiliary rotation groove 2237 on opposite sides. Optionally, the inner surfaces of the first auxiliary rotation groove 2236 and the second auxiliary rotation groove 2237 are provided with arc surfaces. The axis of the first auxiliary rotation groove 2236 is collinear with the axis of the first arc groove 2233, and the axis of the second auxiliary rotation groove 2237 is collinear with the axis of the second arc groove 2235. Adjusting rods 2210 are provided on opposite sides of the end face of the first mounting part 223 away from the third mounting part 226. The axes of the two adjusting rods 2210 are parallel to the axis of the first arc groove 2233.

[0076] The second mounting portion 224 of the base 221 includes a support plate 2241, a first stop plate 2243, and a second stop plate 2246. The support plate 2241 is located on the front side of the base 221 away from the third mounting portion 226. The second stop plate 2246 is located on the front side of the base 221 near the third mounting portion 226. The first stop plate 2243 is located on the front side of the base 221 between the support plate 2241 and the second stop plate 2246. The opposite ends of the support plate 2241 protrude from the opposite sides of the support bar 222, and the opposite ends of the support plate 2241 extend from the opposite sides of the support bar 222. Two adjusting rods 2210 are respectively located on the opposite ends of the same side of the support plate 2241. The opposite ends of the support plate 2241 are respectively provided with through holes 2242 along the axial direction of the adjusting rods 2210. The opposite ends of the first anti-slip plate 2243 extend to the opposite sides of the base 221 to form two first anti-slip pieces 2245. Each first anti-slip piece 2245 has a first axial hole 2245a along the length of the support bar 222. The opposite ends of the second anti-slip plate 2246 extend to the opposite sides of the base 221 to form two second anti-slip pieces 2247. Each second anti-slip piece 2247 has a second axial hole 2247a along the length of the support bar 222. The first axial hole 2245a and the second axial hole 2247a on the same side of the support bar 222 are coaxial. A guide rail 2221 is provided between the first anti-slip plate 2243 and the second anti-slip plate 2246 on the support bar 222. The length of the guide rail 2221 is parallel to the axial direction of the first axial hole 2245a. Positioning blocks 2248 are respectively provided at opposite ends of the second stop plate 2246. Two second shaft holes 2247a pass through the two positioning blocks 2248 respectively. The positioning block 2248 includes a first positioning surface 2248a and a second positioning surface 2248b. The first positioning surface 2248a and the second positioning surface 2248b on each positioning block 2248 are located around the corresponding second shaft hole 2247a. The first positioning surface 2248a is on the side away from the support bar 222, and the second positioning surface 2248b is on the side close to the support bar 222. In other embodiments, positioning blocks may also be provided at opposite ends of the first stop plate 2243. Two first shaft holes 2245a pass through the two positioning blocks respectively. The positioning block includes a first positioning surface and a second positioning surface. The first positioning surface and the second positioning surface on each positioning block are located around the corresponding first shaft hole. The first positioning surface is on the side away from the support bar 222, and the second positioning surface is on the side close to the support bar 222.

[0077] The third mounting portion 226 includes guide sliders 2262 disposed on opposite sides of the support bar 222. The guide sliders 2262 are parallel to the length direction of the support bar 222 and are located at one end near the first mounting portion 223. The end of the first rotating member 251 away from the first connecting member 252 is rotatably connected to the base 221 through the cooperation of a first arc groove and a first arc rail. The first arc groove is disposed on one of the first rotating member 251 and the base 221, and the first arc rail is disposed on the other of the first rotating member 251 and the base 221. In this embodiment, the first protrusion 2232 of the base 221 is provided with a first arc groove 2233, and the first rotating member 251 is provided with a first arc rail 2511, which is rotatably connected to the first arc groove 2233. Specifically, the first rotating member 251 includes a first rotating portion 2512 and a first connecting portion 2514, which are respectively located at opposite ends of the first rotating member 251. A first arc track 2511 is located at the end of the first rotating portion 2512, and the end of the first connecting portion 2514 away from the first rotating portion 2512 is rotatably connected to the first connecting member 252 via a first adapter shaft 253. In this embodiment, the opposite ends of the first rotating portion 2512 are respectively provided with first arc tracks 2511, and the two first arc tracks 2511 are coaxial. Optionally, the first connecting portion 2514 is a first semi-cylinder, which is a first connecting piece connected to the peripheral wall of the first semi-cylinder. The opposite ends of the first semi-cylinder along its axial direction are respectively provided with first arc tracks 2511. Further, the axis of the first arc track 2511 is coaxial with the first semi-cylinder. Optionally, the outer peripheral surface of the first arc track 2511 is coplanar with the outer peripheral surface of the first semi-cylinder. The first connecting part 2514 is provided with two mutually spaced first lugs on the side opposite to the first rotating part 2512. Each first lug is provided with a first sleeve 2515 at one end opposite to the first rotating part 2512. The first sleeve 2515 is provided with a first shaft hole 2515a along its axial direction. The two first sleeves 2515 are coaxial.

[0078] The structure of the second rotating member 256 is the same as that of the first rotating member 251. Specifically, the second rotating member 256 includes a second rotating part 2562 and a second connecting part 2564, which are located at opposite ends of the second rotating member 256. A second arc track 2561 is provided at the end of the second rotating part 2562, and the end of the second connecting part 2564 away from the second rotating part 2562 is rotatably connected to the second connecting member 257. The second rotating member 256 and the base 221 are rotatably connected by the cooperation of a second arc groove and a second arc track. The second arc groove is provided in one of the second rotating member 256 and the base 221, and the second arc track is provided in the other of the second rotating member 256 and the base 221. In this embodiment, the second protrusion 2234 of the base 221 is provided with a second arcuate groove 2235, and the second rotating member 256 is provided with a second arcuate rail 2561, which is rotatably connected to the second arcuate groove 2235. Specifically, the second arcuate rail 2561 is located at the end of the second rotating part 2562, and the end of the second connecting part 2564 away from the second rotating part 2562 is rotatably connected to the second connecting member 257 via a second adapter shaft 258. In this embodiment, the two opposite ends of the second rotating part 2562 are respectively provided with second arcuate rails 2561, and the two second arcuate rails 2561 are coaxial. Optionally, the second rotating part 2562 is a second semi-cylinder, and the second connecting part 2564 is a second connecting piece connected to the peripheral wall of the second semi-cylinder. The two opposite ends of the second semi-cylinder along its axial direction are respectively provided with second arcuate rails 2561. Optionally, the axis of the second arcuate rail 2561 is coaxial with the second semi-cylinder. The second connecting part 2564 is provided with two second lugs spaced apart from each other on the side opposite to the second rotating part 2562. Each second lug is provided with a second sleeve 2565 at one end opposite to the second rotating part 2562. The second sleeve 2565 is provided with a second shaft hole 2565a along its axial direction. The two second sleeves 2565 are coaxial.

[0079] The first connecting member 252 is strip-shaped, and each of its two opposite ends on the side away from the first rotating member 251 has a first rotating groove 2522. The first connecting member 252 includes a first transition portion 2521 and a first guide portion 2523 located at its opposite ends; one first rotating groove 2522 is located on the end face of the first transition portion 2521 opposite to the end face of the first guide portion 2523, and the other first rotating groove 2522 is located on the end face of the first guide portion 2523 opposite to the end face of the first transition portion 2521. The first connecting portion 2514 of the first rotating member 251 is rotatably connected to the first transition portion 2521, and the first guide portion 2523 has a first sliding groove 2520 along a direction perpendicular to the length of the first connecting member 252. The first connecting rod assembly 261 is slidably connected to the first sliding groove 2520. Specifically, the front of the first adapter 2521 is provided with two first clearance openings 2524 spaced apart. The first adapter 2521 is provided with a first connecting hole 2525 along the length of the first connector 252. The first connecting hole 2525 connects the two first clearance openings 2524. The two first clearance openings 2524 are used to accommodate two first sleeves 2515 respectively. When the two first sleeves 2515 are rotatably accommodated in the two first clearance openings 2524, the first shaft hole 2515a is coaxial with the first connecting hole 2525. The first adapter shaft 253 passes through the first connecting hole 2525 and the first shaft hole 2515a. The first adapter shaft 253 and the inner surface of the first connecting hole 2525 are press-fitted or interference-fitted to achieve a fastening effect. Optionally, the first adapter shaft 253 is welded to the first adapter 2521. The front of the first guide slide 2523 is provided with a first guide groove 2526. The opposite ends of the first guide groove 2526 pass through the opposite sides of the first guide slide 2523. The end of the first connecting rod assembly 261 away from the base 221 is slidably accommodated in the first guide groove 2526. The opposite two inner sides of the first guide groove 2526 are respectively provided with first sliding grooves 2520. The opposite ends of the first sliding grooves 2520 pass through the opposite sides of the first guide slide 2523. In this embodiment, the opposite two inner sides of the first guide groove 2526 are respectively provided with first sliding grooves 2520. The connecting member and the side support member are connected by the cooperation of a positioning rod and a positioning groove. The positioning rod is provided in one of the connecting member and the side support member, and the positioning groove is provided in the other of the connecting member and the side support member. The axis of the positioning rod is parallel to the rotation axis between the central support member 234 and the side support member 231. In this embodiment, a first positioning rod 2527 is provided at one end of the first connecting member 252 near the end of the first rotating member 251, and a positioning groove 2317 is provided on the side support member 231. The axis of the first positioning rod 2527 is parallel to the axis of the first connecting hole 2525, and the first positioning rod 2527 can be rotatably inserted into the positioning groove 2317. A first clearance opening 2528 is provided on the side of the first connecting member 252 away from the first rotating member 251 near each first rotating groove 2522.

[0080] The second connecting member 257 is strip-shaped, and second rotating grooves 2572 are respectively provided at opposite ends on the side of the second connecting member 257 away from the second rotating member 256. The second connecting member 257 includes a second transition portion 2571 and a second guide portion 2573, which are respectively provided at opposite ends of the second connecting member 257. One second rotating groove 2572 is provided at the end of the second transition portion 2571 away from the second guide portion 2573, and the other second rotating groove 2572 is provided at the end of the second guide portion 2573 away from the second transition portion 2571. The second connecting portion 2564 of the second rotating member 256 is rotatably connected to the second transition portion 2571, and the second guide portion 2573 has a second sliding groove 2570 along the length direction perpendicular to the second connecting member 257. The second connecting rod assembly 265 is slidably connected to the second sliding groove 2570. Specifically, the second adapter portion 2571 has two second recessed openings 2574 spaced apart on its front side. The second adapter portion 2571 has a second connecting hole 2575 along the length of the second connector 257, and the second connecting hole 2575 connects to the two second recessed openings 2574. The two second recessed openings 2574 are used to respectively accommodate two second sleeves 2565. When the two second sleeves 2565 are rotatably accommodated in the two second recessed openings 2574, the second shaft hole 2565a is coaxial with the second connecting hole 2575. The second adapter shaft 258 passes through the second connecting hole 2575 and the second shaft hole 2565a, and the second adapter shaft 258 is press-fitted or interference-fitted with the inner surface of the second connecting hole 2575 to achieve a fastening effect. Optionally, the second adapter shaft 258 is welded to the second adapter portion 2571. The second guide slide 2573 has a second guide groove 2576 on its front side. The two opposite ends of the second guide groove 2576 pass through the opposite sides of the second guide slide 2573. The end of the second connecting rod assembly 265 away from the base 221 is slidably accommodated in the second guide groove 2576. The two opposite inner sides of the second guide groove 2576 are respectively provided with second sliding grooves 2570. The two opposite ends of the second sliding grooves 2570 pass through the opposite sides of the second guide slide 2573. One end of the second connecting member 257, near the end of the second rotating member 256, is provided with a second positioning rod 2577. The side support member 231 is provided with a positioning groove 2317. The axis of the second positioning rod 2577 is parallel to the axis of the second connecting hole 2575. The second positioning rod 2577 is rotatably inserted into the positioning groove 2317.

[0081] The second connector 257 has a second clearance opening 2578 on the side opposite to the second rotating member 256 near each second rotating groove 2572.

[0082] Please refer to the following: Figures 9-23The first folding mechanism 24 further includes a pair of connecting shafts 220 connected to opposite sides of the base 221, with the axes L0 of the pair of connecting shafts 220 spaced parallel together. The linkage mechanism further includes a linkage member 28 located between the first linkage assembly 261 and the second linkage assembly 265. The first linkage assembly 261 includes a first rotating portion 2621 and a second rotating portion 2641 rotatably connected to one of the connecting shafts 220. The second linkage assembly 265 includes a third rotating portion 2661 and a fourth rotating portion 2681 rotatably connected to the other connecting shaft 220. The linkage member 28 is slidably connected to the pair of connecting shafts 220 along the axial direction of the connecting shafts 220. The linkage member 28 includes a first sliding portion 281 located between the first rotating portion 2621 and the second rotating portion 2641, and a portion located between the third rotating portion 2661 and the fourth rotating portion 2681. The second sliding part 283, the first rotating part 2621 and the first sliding part 281, and the third rotating part 2661 and the second sliding part 283 are respectively connected by the cooperation of the first double helical surface group; the second rotating part 2641 and the first sliding part 281, and the fourth rotating part 2681 and the second sliding part 283 are respectively connected by the cooperation of the second double helical surface group; when the linkage 28 moves relative to the base 221 along the axial direction of the connecting shaft 220, the first connecting rod assembly 261 and the second connecting rod assembly 265 rotate synchronously in opposite directions relative to the base 221. Specifically, the first linkage assembly 261 includes a first linkage 262 and a second linkage 264 connected to one of the connecting shafts 220. The first linkage 262 includes a first rotating portion 2621 rotatably sleeved on one of the connecting shafts 220, and the second linkage 264 includes a second rotating portion 2641 rotatably sleeved on the one of the connecting shafts 220. The second linkage assembly 265 includes a third linkage 266 and a fourth linkage 268 connected to another connecting shaft 220. The third linkage 266 includes a third rotating portion 2661 rotatably sleeved on the other connecting shaft 220, and the fourth linkage 268 includes a fourth rotating portion 2681 rotatably sleeved on the other connecting shaft 220. When the first rotating part 2621 and the second rotating part 2641 rotate about one of the connecting shafts 220, and / or the third rotating part 2661 and the fourth rotating part 2681 rotate about the other connecting shaft 220, the linkage 28 moves along the axial direction of the connecting shaft 220, so that the first connecting rod assembly 261 and the second connecting rod assembly 265 rotate synchronously in opposite directions relative to the linkage 28 about a pair of connecting shafts 220 respectively, and the first connecting rod assembly 261 and the second connecting rod assembly 265 synchronously move closer to each other or synchronously move away from each other. Each connecting shaft 220 includes a shaft body 2201 and a cover 2203 provided at one end of the shaft body 2201. The outer peripheral surface of the shaft body 2201 away from the cover 2203 is provided with a locking groove 2205, which surrounds the circumference of the shaft body 2201.In this embodiment, the cover 2203 is a circular cover, and the diameter of the cover 2203 is smaller than the inner diameter of the through hole 2242 of the base 221.

[0083] The first link assembly 261 further includes a first link portion 2625 connected to the first rotating portion 2621 and a second link portion 2645 connected to the second rotating portion 2641. The second link assembly 265 further includes a third link portion 2665 connected to the third rotating portion 2661 and a fourth link portion 2685 connected to the fourth rotating portion 2681. The first link portion 2625 is connected to the second link portion 2645. Specifically, the first link portion 2625 and the second link portion 2645 are connected through the cooperation of the first connecting bar 2622 and the second connecting bar 2642. The third link portion 2665 is connected to the fourth link portion 2685. Specifically, the third link portion 2665 and the fourth link portion 2685 are connected through the cooperation of the third connecting bar 2662 and the fourth connecting bar 2682. The first link 262 further includes a first connecting portion connecting the first rotating part 2621 and the first link part 2625; the second link 264 further includes a second connecting portion connecting the second rotating part 2641 and the second link part 2645; the third link 266 further includes a third connecting portion connecting the third rotating part 2661 and the third link part 2665; and the fourth link 268 further includes a fourth connecting portion connecting the fourth rotating part 2681 and the fourth link part 2685. In this embodiment, the first rotating part 2621 is a first rotating cylinder rotatably sleeved on the connecting shaft 220. The first rotating cylinder has a first rotating hole 2624 along its axial direction. The first connecting rod part 2625 is a strip-shaped first rod body. The first connecting part is connected to the outer peripheral surface of the first rotating cylinder and one end of the first rod body. The axis of the first rotating cylinder is perpendicular to the length direction of the first connecting rod part 2625. The second rotating part 2641 is a second rotating cylinder rotatably sleeved on the connecting shaft 220. The second rotating cylinder has a second rotating hole 2644 along its axial direction. The second connecting rod part 2645 is a strip-shaped second rod body. The second connecting part is connected to the outer peripheral surface of the second rotating cylinder and one end of the second rod body. The axis of the second rotating cylinder is perpendicular to the length direction of the second connecting rod part 2645. The third rotating part 2661 is a third rotating cylinder rotatably fitted onto the connecting shaft 220. The third rotating cylinder has a third rotating hole 2664 along its axial direction. The third connecting rod part 2665 is a strip-shaped third rod body. The third connecting part is connected to the outer peripheral surface of the third rotating cylinder and one end of the third rod body. The axis of the third rotating cylinder is perpendicular to the length direction of the third connecting rod part 2665. The fourth rotating part 2681 is a fourth rotating cylinder rotatably fitted onto the connecting shaft 220. The fourth rotating cylinder has a fourth rotating hole 2684 along its axial direction. The fourth connecting rod part 2685 is a strip-shaped fourth rod body. The fourth connecting part is connected to the outer peripheral surface of the fourth rotating cylinder and one end of the fourth rod body. The axis of the fourth rotating cylinder is perpendicular to the length direction of the fourth connecting rod part 2685.The first sliding part 281 of the linkage 28 is provided with a first sliding hole 2811, and the second sliding part 283 is provided with a second sliding hole 2831. The axis of the first sliding hole 2811 is parallel to the axis of the second sliding hole 2831. The first sliding part 281 of the linkage 28 is located between the first rotating part 2621 and the second rotating part 2641, wherein a connecting shaft 220 passes through the first rotating hole 2624, the first sliding hole 2811 and the second rotating hole 2644; the second sliding part 283 is located between the third rotating part 2661 and the fourth rotating part 2681, and another connecting shaft 220 passes through the third rotating hole 2664, the second sliding hole 2831 and the fourth rotating hole 2684.

[0084] The first link assembly 261 and the connector are connected by a sliding groove and a sliding rail. The length direction of the sliding groove is perpendicular to the rotation axis of the rotating member and the base 221. The sliding groove is provided in one of the first link assembly 261 and the connector, and the sliding rail is provided in the other. Specifically, the first link portion 2625 has a first sliding rail 2620 on the side opposite to the second link member 264. The length direction of the first sliding rail 2620 is perpendicular to the axis of the first rotating hole 2624. The first sliding rail 2620 is slidably inserted into one of the first sliding grooves 2520 of the first connector 252. The first rotating portion 2621 has a first cam 2626 at the end opposite to the second link member 264. The first rotating portion 2621 and the first cam 2626 are coaxial. The first sliding rail 2620 and the first cam 2626 are located on the same side of the first link member 262. The first cam 2626 includes a concave-convex surface disposed at the end of the first rotating cylinder. This concave-convex surface includes first protrusions 2626a and first recesses 2626b arranged sequentially at intervals along the circumference of the first rotating cylinder. The number of first protrusions 2626a and the number of first recesses 2626b can be set as needed. For example, the first cam 2626 may include one first protrusion 2626a and one first recess 2626b, two first protrusions 2626a and two first recesses 2626b, three first protrusions 2626a and three first recesses 2626b, or four first protrusions 2626a and four first recesses 2626b, etc. In this embodiment, the first cam 2626 includes three first protrusions 2626a and three first recesses 2626b arranged at intervals along the circumference of the first rotating cylinder. The first rotating part 2621 is provided with a first anti-slip groove 2627 that communicates with the first rotating hole 2624. Specifically, the first anti-slip groove 2627 is located on the outer peripheral surface of the first rotating part 2621 and extends radially to the first connecting part along the first rotating part 2621. The first link assembly 261 and the side support member 231 are connected by a limiting rod and a limiting groove. The axis of the limiting rod is parallel to the rotation axis between the middle support member 234 and the side support member 231. The limiting rod is provided in one of the first link assembly 261 and the side support member 231, and the limiting groove is provided in the other of the first link assembly 261 and the side support member 231. In this embodiment, the first link assembly 261 is provided with a first limiting rod 2623, and the side support member 231 is provided with a limiting groove 2315. Optionally, the first link part 2625 is provided with a first limiting rod 2623 at the end away from the first slide rail 2620 and away from the first rotating part 2621. The axis of the first limiting rod 2623 is parallel to the axis of the first rotating part 2621, and the first limiting rod 2623 is rotatably inserted into the limiting groove 2315. In other embodiments, a first limiting rod is provided at the end of the second connecting rod portion 2645 away from the second slide rail 2640 and away from the second rotating portion 2641.In this embodiment, the first connecting bar 2622 is a connecting rod with an L-shaped cross-section.

[0085] The second connecting rod portion 2645 has a second slide rail 2640 on the side opposite to the first connecting rod 262. The length direction of the second slide rail 2640 is perpendicular to the axis of the second rotating hole 2644. The second slide rail 2640 is slidably inserted into another first slide groove 2520 of the first connector 252. The second rotating portion 2641 has a second cam 2646 at the end opposite to the first connecting rod 262. The second rotating portion 2641 and the second cam 2646 are coaxial. The second slide rail 2640 and the second cam 2646 are located on the same side of the second connecting rod 264. The second cam 2646 includes a concave-convex surface disposed at the end of the second rotating cylinder. This concave-convex surface includes second protrusions 2646a and second recesses 2646b arranged sequentially at intervals along the circumference of the second rotating cylinder. The number of second protrusions 2646a and second recesses 2646b can be configured as needed. For example, the second cam 2646 may include one second protrusion 2646a and one second recess 2646b, two second protrusions 2646a and two second recesses 2646b, three second protrusions 2646a and three second recesses 2646b, or four second protrusions 2646a and four second recesses 2646b, etc. In this embodiment, the second cam 2646 includes three second protrusions 2646a and three second recesses 2646b arranged at intervals along the circumference of the second rotating cylinder. The second rotating part 2641 is provided with a second anti-slip groove 2647 communicating with the second rotating hole 2644. Specifically, the second anti-slip groove 2647 is located on the outer peripheral surface of the second rotating part 2641 and extends radially to the second connecting part. The second rotating part 2641 is provided with a first anti-rotation block 2648 on one side of the second anti-slip groove 2647. Specifically, the second rotating part 2641 is provided with a first clearance opening on one side of the second anti-slip groove 2647. The first clearance opening is located on the outer peripheral surface of the second rotating part 2641 away from the second connecting rod part 2645. The first clearance opening communicates with the second anti-slip groove 2647 to form a first anti-rotation block 2648 on the side of the second rotating part 2641 near the second connecting rod part 2645. In this embodiment, the second connecting bar 2642 is a connecting rod with an L-shaped cross-section, and the second connecting bar 2642 can overlap the first connecting bar 2622.

[0086] The second link assembly 265 and the connector are connected by a sliding groove and a sliding rail. The length direction of the sliding groove is perpendicular to the rotation axis of the rotating member and the base 221. The sliding groove is provided in one of the second link assembly 265 and the connector, and the sliding rail is provided in the other. Specifically, the third link portion 2665 has a third sliding rail 2660 on the side opposite to the fourth link member 268. The length direction of the third sliding rail 2660 is perpendicular to the axis of the third rotating hole 2664. The third sliding rail 2660 is slidably inserted into one of the second sliding grooves 2570. The third rotating portion 2661 has a third cam 2666 at the end opposite to the fourth link member 268. The third rotating portion 2661 and the third cam 2666 are coaxial, and the third sliding rail 2660 and the third cam 2666 are located on the same side of the third link member 266. The third cam 2666 includes a concave-convex surface disposed at the end of the third rotating cylinder. This concave-convex surface includes third protrusions 2666a and third recesses 2666b arranged sequentially at intervals along the circumference of the third rotating cylinder. The number of third protrusions 2666a and the number of third recesses 2666b can be configured as needed. For example, the third cam 2666 may include one third protrusion 2666a and one third recess 2666b, two third protrusions 2666a and two third recesses 2666b, three third protrusions 2666a and three third recesses 2666b, or four third protrusions 2666a and four third recesses 2666b, etc. In this embodiment, the third cam 2666 includes three third protrusions 2666a and three third recesses 2666b arranged at intervals along the circumference of the third rotating cylinder. The third rotating part 2661 is provided with a third anti-slip groove 2667 that communicates with the third rotating hole 2664. Specifically, the third anti-slip groove 2667 is located on the outer peripheral surface of the third rotating part 2661 and extends radially to the third connecting part.

[0087] The second link assembly 265 and the side support member 231 are connected by a limiting rod and a limiting groove. The axis of the limiting rod is parallel to the rotation axis between the middle support member 234 and the side support member 231. The limiting rod is provided on one of the second link assembly 265 and the side support member 231, and the limiting groove is provided on the other. In this embodiment, the second link assembly 265 is provided with a second limiting rod 2663, and the side support member 231 is provided with a limiting groove 2315. Optionally, the third link portion 2665 is provided with a second limiting rod 2663 at the end away from the third slide rail 2660 and away from the third rotating portion 2661. The axis of the second limiting rod 2663 is parallel to the axis of the third rotating portion 2661. In other embodiments, the fourth link portion 2685 is provided with a second limiting rod at the end away from the fourth slide rail 2680 and away from the fourth rotating portion 2681. In this embodiment, the third connecting bar 2662 is a connecting rod with an L-shaped cross-section.

[0088] A fourth slide rail 2680 is provided on the side of the fourth link 2685 opposite to the third link 266. The length direction of the fourth slide rail 2680 is perpendicular to the axis of the fourth rotating hole 2684. The fourth slide rail 2680 is slidably inserted into the second slide groove 2570. A fourth cam 2686 is provided at the end of the fourth rotating part 2681 opposite to the third link 266. The fourth rotating part 2681 and the fourth cam 2686 are coaxial. The fourth slide rail 2680 and the fourth cam 2686 are located on the same side of the fourth link 268. The fourth cam 2686 includes a concave-convex surface disposed at the end of the fourth rotating cylinder. This concave-convex surface includes fourth protrusions 2686a and fourth recesses 2686b arranged sequentially at intervals along the circumference of the fourth rotating cylinder. The number of fourth protrusions 2686a and fourth recesses 2686b can be configured as needed. For example, the fourth cam 2686 may include one fourth protrusion 2686a and one fourth recess 2686b, two fourth protrusions 2686a and two fourth recesses 2686b, three fourth protrusions 2686a and three fourth recesses 2686b, or four fourth protrusions 2686a and four fourth recesses 2686b, etc. In this embodiment, the fourth cam 2686 includes three fourth protrusions 2686a and three fourth recesses 2686b arranged at intervals along the circumference of the fourth rotating cylinder. The fourth rotating part 2681 is provided with a fourth anti-slip groove 2687 communicating with the fourth rotating hole 2684. Specifically, the fourth anti-slip groove 2687 is located on the outer peripheral surface of the fourth rotating part 2681 and extends radially to the fourth connecting part. The fourth rotating part 2681 is provided with a second anti-rotation block 2688 on one side of the fourth anti-slip groove 2687. Specifically, the fourth rotating part 2681 is provided with a second clearance opening on one side of the fourth anti-slip groove 2687. The second clearance opening is located on the outer peripheral surface of the fourth rotating part 2681 away from the fourth connecting rod part 2685. The second clearance opening communicates with the fourth anti-slip groove 2687 to form a second anti-rotation block 2688 on the side of the fourth rotating part 2681 near the fourth connecting rod part 2685. In this embodiment, the fourth connecting bar 2682 is a connecting rod with an L-shaped cross-section, and the fourth connecting bar 2682 can overlap the third connecting bar 2662.

[0089] The linkage 28 also includes a connecting portion 285 connecting the first sliding portion 281 and the second sliding portion 283. The first rotating portion 2621 and the third rotating portion 2661 are located on opposite sides of one end of the connecting portion 285, and the second rotating portion 2641 and the fourth rotating portion 2681 are located on opposite sides of the other end of the connecting portion 285. The first rotating portion 2621 and the first sliding portion 281 are rotatably engaged by a first double helix surface group, and the third rotating portion 2661 and the second sliding portion 283 are rotatably engaged by a first double helix surface group. The two first double helix surface groups are symmetrical about the center line O of the connecting portion 285. The second rotating portion 2641 and the first sliding portion 281 are rotatably engaged by a second double helix surface group, and the fourth rotating portion 2681 and the second sliding portion 283 are rotatably engaged by a second double helix surface group. The two second double helix surface groups are symmetrical about the center line O of the connecting portion 285. Optionally, the linkage 28 and the base 221 are slidably connected by a guide rail and a guide groove. The guide rail is provided on one of the linkage 28 and the base 221, and the guide groove is provided on the other of the linkage 28 and the base 221. The sliding direction of the linkage 28 relative to the base 221 is parallel to the axial direction of the connecting shaft 220. In this embodiment, the back of the connecting part 285 is provided with a guide groove 2852. When the linkage 28 is installed on the base 221, the guide rail 2221 is slidably accommodated in the guide groove 2852 of the linkage 28.

[0090] The first rotating part 2621 and the first sliding part 281, and the third rotating part 2661 and the second sliding part 283, are respectively connected by a first double helical surface assembly. The first double helical surface assembly includes a first helical surface 2841, a second helical surface 2842, a first abutting helical surface 2633, and a second abutting helical surface 2634. The first sliding part 281 and the second sliding part 283 are respectively provided with a first helical surface 2841 and a second helical surface 2842 at the same end. The rotation direction of the first helical surface 2841 is opposite to that of the second helical surface 2842. The first helical surface 2841 on the first sliding part 281 and the first helical surface 2841 on the second sliding part 283 are symmetrical about the center line O of the connecting part 285. The second helical surface 2842 on the first sliding part 281 and the second helical surface 2842 on the second sliding part 283 are symmetrical about the center line O of the connecting part 285. The ends of the first rotating part 2621 and the third rotating part 2661 facing the linkage 28 are respectively provided with a first abutting spiral surface 2633 and a second abutting spiral surface 2634. The first spiral surface 2841 and the first abutting spiral surface 2633 are rotatably engaged with each other, and the second spiral surface 2842 and the second abutting spiral surface 2634 are rotatably engaged with each other. Specifically, the first spiral surface 2841 and the second spiral surface 2842 are provided at one end of the first sliding part 281 facing the first rotating part 2621, and the first spiral surface 2841 and the second spiral surface 2842 are arranged circumferentially along the first sliding part 281. In this embodiment, the first spiral surface 2841 and the second spiral surface 2842 are located on opposite sides of the first sliding hole 2811, and the first spiral surface 2841 and the second spiral surface 2842 are located on opposite sides of the connecting part 285. The first rotating part 2621 is provided with a first abutting spiral surface 2633 and a second abutting spiral surface 2634 at one end opposite to the first cam 2626. The first abutting spiral surface 2633 and the second abutting spiral surface 2634 are arranged circumferentially along the first rotating part 2621, and the rotation direction of the first abutting spiral surface 2633 is opposite to that of the second abutting spiral surface 2634. In this embodiment, the first abutting spiral surface 2633 and the second abutting spiral surface 2634 are located on opposite sides of the first rotating hole 2624 of the first rotating part 2621. The first abutting spiral surface 2633 is located on the side away from the first connecting rod part 2625, and the second abutting spiral surface 2634 is located on the side close to the first connecting rod part 2625.The third rotating part 2661 is provided with a first abutting spiral surface 2633 and a second abutting spiral surface 2634 at one end opposite to the third cam 2666. The first abutting spiral surface 2633 and the second abutting spiral surface 2634 are arranged circumferentially along the third rotating part 2661, and the rotation direction of the first abutting spiral surface 2633 is opposite to that of the second abutting spiral surface 2634. In this embodiment, the first abutting spiral surface 2633 and the second abutting spiral surface 2634 are located on opposite sides of the third rotating hole 2664 of the third rotating part 2661. The first abutting spiral surface 2633 is located on the side away from the third connecting rod part 2665, and the second abutting spiral surface 2634 is located on the side close to the third connecting rod part 2665.

[0091] The second rotating part 2641 and the first sliding part 281, and the fourth rotating part 2681 and the second sliding part 283, are respectively connected by a second double helical surface assembly. The second double helical surface assembly includes a third helical surface 2843, a fourth helical surface 2844, a third abutting helical surface 2637, and a fourth abutting helical surface 2638. The first sliding part 281 is provided with the third helical surface 2843 and the fourth helical surface 2844 at one end away from the first rotating part 2621. The second sliding part 283 is provided with the third helical surface 2843 and the fourth helical surface 2844 at one end away from the third rotating part 2621. One end of the moving part 2661 is provided with a third helical surface 2843 and a fourth helical surface 2844. The direction of rotation of the third helical surface 2843 is opposite to that of the fourth helical surface 2844. The third helical surface 2843 on the first sliding part 281 and the third helical surface 2843 on the second sliding part 283 are symmetrical about the center line O of the connecting part 285. The fourth helical surface 2844 on the first sliding part 281 and the fourth helical surface 2844 on the second sliding part 283 are symmetrical about the center line O of the connecting part 285. The ends of the second rotating part 2641 and the fourth rotating part 2681 facing the linkage member 28 are respectively provided with a third abutting helical surface 2637 and a fourth abutting helical surface 2638. The third helical surface 2843 and the third abutting helical surface 2637 are rotatably engaged with each other, and the fourth helical surface 2844 and the fourth abutting helical surface 2638 are rotatably engaged with each other. Specifically, the first sliding portion 281 has a third helical surface 2843 and a fourth helical surface 2844 at one end facing the second rotating portion 2641, and the third helical surface 2843 and the fourth helical surface 2844 are arranged circumferentially along the first sliding portion 281; the third helical surface 2843 and the fourth helical surface 2844 of the second double helical surface group are located on opposite sides of the axis of the corresponding connecting shaft 220. In this embodiment, the third helical surface 2843 is located on the side closer to the connecting portion 285, and the fourth helical surface 2844 is located on the side away from the connecting portion 285. The second rotating part 2641 has a third abutting helical surface 2637 and a fourth abutting helical surface 2638 at the end opposite to the second cam 2646. The third abutting helical surface 2637 and the fourth abutting helical surface 2638 are arranged circumferentially around the third rotating part 2661, and the rotation direction of the third abutting helical surface 2637 is opposite to that of the fourth abutting helical surface 2638. In this embodiment, the third abutting helical surface 2637 and the fourth abutting helical surface 2638 are located on opposite sides of the third connecting hole 2644 of the third rotating part 2661. The third abutting helical surface 2637 is located on the side away from the second connecting rod part 2645, and the fourth abutting helical surface 2638 is located on the side closer to the second connecting rod part 2645. The second sliding part 283 has a third helical surface 2843 and a fourth helical surface 2844 at the end facing the fourth rotating part 2681, and the third helical surface 2843 and the fourth helical surface 2844 are arranged circumferentially around the second sliding part 283. In this embodiment, the third helical surface 2843 is located on the side closer to the connecting portion 285, and the fourth helical surface 2844 is located on the side away from the connecting portion 285.The fourth rotating part 2681 has a third abutting spiral surface 2637 and a fourth abutting spiral surface 2638 at one end away from the fourth cam 2686. The third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 are arranged circumferentially along the fourth rotating part 2681. In this embodiment, the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 are located on opposite sides of the fourth rotating hole 2684 of the fourth rotating part 2681. The third abutting spiral surface 2637 is located on the side away from the fourth connecting rod part 2685, and the fourth abutting spiral surface 2638 is located on the side close to the fourth connecting rod part 2685.

[0092] The first folding mechanism 24 further includes a first abutment 240 and a second abutment 246 slidably sleeved on a pair of connecting shafts 220. A first rotating portion 2621 and / or a third rotating portion 2661 engages with the first abutment 240 via a first cam assembly, and a second rotating portion 2641 and / or a fourth rotating portion 2681 engages with the second abutment 246 via a second cam assembly. In this embodiment, the first rotating portion 2621 and the third rotating portion 2661 engage with the first abutment 240 via the first cam assembly, and the second rotating portion 2641 and the fourth rotating portion 2681 engage with the second abutment 246 via the second cam assembly. In other embodiments, the first abutment 240 or the second abutment 246 may be omitted. If the first abutment 240 is omitted, the second abutment 246 cooperates with the second rotating part 2641 and the fourth rotating part 2681 respectively through the second cam assembly. If the second abutment 246 is omitted, the first abutment 240 cooperates with the first rotating part 2621 and the third rotating part 2661 respectively through the first cam assembly.

[0093] The first abutment member 240 includes two first sleeves 241 slidably sleeved on a pair of connecting shafts 220. Each of the two first sleeves 241 has a first abutting cam 242 at one end facing the first rotating part 2621 and the third rotating part 2665. The first sleeves 241 and their first abutting cams 242 are coaxial. The first rotating part 2621 is connected to one of the first sleeves 241 via a first cam 2626 engaging with the first abutting cam 242. The third rotating part 2661 is connected to the other first sleeve 241 via a third cam 2666 engaging with the first abutting cam 242. When the first link assembly 261 and / or the second link assembly 265 rotates around the corresponding connecting shaft 220, the first cam 2626 and the third cam 2666 respectively have frictional resistance with the two first abutting cams 242. This frictional resistance can prevent the first link assembly 261 and the second link assembly 265 from rotating around the corresponding connecting shaft 220. Specifically, one connecting shaft 220 passes through the first cam 2626 of the first connecting rod 262 and one of the first abutting cams 242 of the first abutting member 290, and the other connecting shaft 220 passes through the third cam 2666 of the third connecting rod 266 and another first abutting cam 242 of the first abutting member 240. The two first abutting cams 242 rotatably abut against the first cam 2626 and the third cam 2666, respectively. Further, the first abutting member 240 also includes a first connecting portion 243 connecting the two first sleeves 241, whose axes are parallel. The axis of each first sleeve 241 is collinear with the axis of the corresponding first shaft hole 2410, and the first abutting cam 242 is located at the end of the first sleeve 241 facing away from the first elastic member 244. Each first abutting cam 242 includes a concave-convex surface disposed on the end of the first sleeve 241 opposite to the first elastic member 244. This concave-convex surface includes third protrusions 2421 and third recesses 2423 arranged sequentially at intervals along the circumference of the first sleeve 241. The number of third protrusions 2421 and third recesses 2423 can be configured as needed. For example, the first abutting cam 242 may include one third protrusion 2421 and one third recess 2423, two third protrusions 2421 and two third recesses 2423, three third protrusions 2421 and three third recesses 2423, or four third protrusions 2421 and four third recesses 2423, etc. In this embodiment, the first abutting cam 242 includes three third protrusions 2421 and three third recesses 2423 arranged at intervals along the circumference of the first sleeve 241. One of the first abutting cams 242 has its axis coaxial with the corresponding first sleeve 241, and the other first abutting cam 242 has its axis coaxial with the corresponding first sleeve 241. Preferably, the opposite end faces of the first abutting member 240 form arc surfaces to facilitate the folding or unfolding of the rotating shaft device 22.In some embodiments, one of the first abutting cams 242 on the two first sleeves 241 can be omitted, that is, the first cam 2626 of the first link 262 or the third cam 2666 of the third link 266 can be omitted.

[0094] The second abutment member 246 includes two second sleeves 2461 that are slidably sleeved on a pair of connecting shafts 220. The two second sleeves 2461 are respectively provided with a second abutting cam 2460 at one end facing the second rotating part 2641 and the fourth rotating part 2681. The second sleeves 2461 and the second abutting cams 2460 thereon are coaxial. The second rotating part 2641 is connected to one of the second sleeves 2461 through the cooperation of the second cam 2646 and the second abutting cam 2460. The fourth rotating part 2681 is connected to the other second sleeve 2461 through the cooperation of the fourth cam 2686 and the second abutting cam 2460. When the first link assembly 261 and / or the second link assembly 265 rotates around the corresponding connecting shaft 220, the second cam 2646 and the fourth cam 2686 respectively have frictional resistance with the two second abutting cams 2460. This frictional resistance can prevent the first link assembly 261 and the second link assembly 265 from rotating around the corresponding connecting shaft 220. Specifically, one connecting shaft 220 passes through the second cam 2646 of the second link member 264 and one of the second abutting cams 2460 of the second abutting member 246, and the other connecting shaft 220 passes through the fourth cam 2686 of the fourth link member 268 and the other second abutting cam 2460 of the second abutting member 246. The two second abutting cams 2460 respectively rotatably abut against the second cam 2646 and the fourth cam 2686. Furthermore, the second abutment member 246 also includes a second connecting portion 2463 connecting the two second sleeves 2461, the axes of the two second sleeves 2461 being parallel and spaced apart. The axis of each second sleeve 2461 is collinear with the axis of the corresponding second shaft hole 2465, and a second abutting cam 2460 is disposed at the end of the second sleeve 2461 opposite to the second elastic member 248. Each second abutting cam 2460 includes a concave-convex surface disposed at the end of the second sleeve 2461 opposite to the second elastic member 248, the concave-convex surface including a fourth protrusion 2462 and a fourth recess 2464 arranged sequentially and spaced apart along the circumference of the second sleeve 2461. The number of fourth protrusions 2462 and fourth recesses 2464 can be set as needed. For example, the second abutting cam 2460 may include one fourth protrusion 2462 and one fourth recess 2464, two fourth protrusions 2462 and two fourth recesses 2464, three fourth protrusions 2462 and three fourth recesses 2464, or four fourth protrusions 2462 and four fourth recesses 2464, etc. In this embodiment, the second abutting cam 2460 includes three fourth protrusions 2462 and three fourth recesses 2464 arranged circumferentially along the second sleeve 246. The axis of one second abutting cam 2460 is coaxial with the corresponding second sleeve 2461, and the axis of the other second abutting cam 2460 is coaxial with the corresponding second sleeve 2461. Preferably, the opposite end faces of the second abutting member 246 form arc surfaces to facilitate the folding or unfolding of the rotating shaft device 22.In some embodiments, one of the second abutting cams 2460 on the two second sleeves 2461 can be omitted, that is, the second cam 2646 of the second link 264 or the fourth cam 2686 of the fourth link 268 can be omitted.

[0095] The first folding mechanism 24 further includes a first elastic element 244 and / or a second elastic element 248. The first elastic element 244 is used to push the first abutting element 240 against the first rotating part 2621 and the third rotating part 2661, and the second elastic element 248 is used to push the second abutting element 246 against the second rotating part 2641 and the fourth rotating part 2681. Specifically, the first elastic element 244 is used to push the first abutting cams 242 of the two first sleeves 241 against the first cam 2626 and the third cam 2666 respectively, and the second elastic element 248 is used to drive the second abutting cams 2460 of the two second sleeves 2461 against the second cam 2646 and the fourth cam 2686 respectively.

[0096] like Figures 9-13As shown, the first folding mechanism 24 further includes a positioning member 27 slidably connected to the base 221. The first rotating member 251 and the positioning member 27 are rotatably connected by a first arc track and a third arc groove. The first arc track is provided on one of the first rotating member 251 and the positioning member 27, and the third arc groove is provided on the other. The second rotating member 256 and the positioning member 27 are rotatably connected by a second arc track and a third arc groove. The second arc track is provided on one of the second rotating member 256 and the positioning member 27, and the third arc groove is provided on the other. The axes of the two third arc grooves are collinear with the axes of the first arc groove 2233 and the second arc groove 2235, respectively. The positioning member 27 is connected to the third mounting portion 226 of the base 221, and the positioning member 27 and the base 221 jointly position the first rotating member 251 and the second rotating member 256. The positioning member 27 includes positioning portions 272 located at opposite ends, and a connecting portion 275 connecting the two positioning portions 272. A third arcuate groove 2721 is provided on the same side of each of the two positioning portions 272. The axes of the two third arcuate grooves 2721 are parallel. One of the first arcuate rails 2511 of the first rotating member 251 and one of the second arcuate rails 2561 of the second rotating member 256 are rotatably accommodated in the two third arcuate grooves 2721. In other embodiments, the sides of the two positioning portions 272 facing the first rotating member 251 are respectively provided with arcuate rails, and the sides of the first rotating portion 2512 of the first rotating member 251 and the second rotating portion 2562 of the second rotating member 256 facing the positioning member 27 are respectively provided with arcuate grooves. The two arcuate rails are rotatably accommodated in the two arcuate grooves. The positioning member 27 and the base 221 are slidably connected by a guide slider and a guide groove. The guide slider is provided on one of the positioning member 27 and the base 221, and the guide groove is provided on the other. In this embodiment, the back of the positioning member 27 is provided with a guide groove 276, and the third mounting part 226 is slidably accommodated in the guide groove 276, so that the positioning member 27 can move along an axial direction parallel to the connecting shaft 220. Optionally, the back of the connecting part 275 is provided with a guide groove 2752 along the axial direction of the third arc groove 2721. The opposite ends of the guide groove 2752 pass through the opposite sides of the positioning member 27, and the guide slider 2262 is slidably inserted into the guide groove 2752. The opposite sides of the guide groove 276 are provided with guide grooves 2752, which extend along the axial direction of the connecting shaft 220. The opposite ends of the guide groove 2752 pass through the opposite sides of the positioning member 27, and the two guide sliders 2262 of the third mounting part 226 are slidably accommodated in the two guide grooves 276 of the positioning member 27. The opposite ends of the sides of the two positioning parts 272 away from the third arc groove 2721 are provided with connecting posts 2724.

[0097] The first folding mechanism 24 further includes a gasket 245 sleeved on one end of a pair of connecting shafts 220 and a snap-fit ​​piece 249 connected to the opposite end of the pair of connecting shafts 220. The gasket 245 includes two annular pads 2451 and a first connecting strip 2453 connected between the two annular pads 2451. The two annular pads 2451 are respectively sleeved on the pair of connecting shafts. The snap-fit ​​piece 249 includes C-shaped buckles 2491 respectively snapped onto the pair of connecting shafts 220 and a second connecting strip 2493 connected between the two C-shaped buckles 2491.

[0098] like Figure 4 and Figure 5 As shown, the front of the back shell 29 is provided with a positioning part 291 for positioning on the base 221. The positioning part 291 and the base 221 can be fixedly connected by means of, but not limited to, snap-fit, screw-fit, or adhesive bonding. In this embodiment, the positioning part 291 is provided with a positioning post 293, and the back of the base 221 is provided with a positioning hole. The positioning post 293 is snapped into the positioning hole so that the base 221 is fixedly connected to the positioning part 291. In other embodiments, the positioning part 221 may also have a positioning hole, and the back of the base 221 may be provided with a positioning post. The positioning post and the positioning hole are connected to each other so that the base 221 is fixedly connected to the positioning part. In this embodiment, the front of the back shell 29 is provided with three positioning parts 291, and the three positioning parts 291 are arranged at intervals along the length direction of the back shell 29. In other embodiments, the front of the back shell 29 is provided with at least one positioning part 291, and the number of positioning parts 291 on the back shell 29 is the same as the number of bases 221 on the first folding mechanism 24.

[0099] Please refer to the following: Figures 8-13 and Figures 22-23When assembling the first folding mechanism 24, the first rotating part 2621 of the first connecting rod 262 and the second rotating part 2641 of the second connecting rod 264 are respectively placed at opposite ends of the first sliding part 281 of the linkage 28, so that the first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the first rotating part 2621 are respectively attached to the first spiral surface 2841 and the second spiral surface 2842 of the first sliding part 281, and the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the second rotating part 2641 are respectively attached to the third spiral surface 2843 and the fourth spiral surface 2844 of the first sliding part 281, so that the first sliding part 281 is coaxial with the first rotating part 2621 and the second rotating part 2641, and the first sliding hole 2811 is directly opposite the first rotating hole 2624 and the second rotating hole 2644. The third rotating part 2661 of the third connecting rod 266 and the fourth rotating part 2681 of the fourth connecting rod 268 are respectively placed at opposite ends of the second sliding part 283 of the linkage 28, so that the first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the third rotating part 2661 are respectively attached to the first spiral surface 2841 and the second spiral surface 2842 of the second sliding part 283, and the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the fourth rotating part 2681 are respectively attached to the first spiral surface 2841 and the second spiral surface 2842 of the second sliding part 283. The three helical surfaces 2843 and 2844 make the second sliding part 283 coaxial with the third rotating part 2661 and the fourth rotating part 2681, and the second sliding hole 2831 is directly opposite the third rotating hole 2664 and the fourth rotating hole 2684; the first connecting strip 2622 and the second connecting strip 2642 are overlapped with each other and can be fixedly connected by means of welding, gluing or other methods, but not limited to welding or gluing; the third connecting strip 2662 and the fourth connecting strip 2682 are overlapped with each other and can be fixedly connected by means of welding or gluing or other methods, but not limited to welding or gluing. The first abutment 240 is placed on the side of the first link 262 away from the second link 264, such that the two first abutting cams 242 of the first abutment 240 respectively cooperate with the first cam 2626 of the first link 262 and the third link 266 of the third link 266. The second abutment 246 is placed on the side of the second link 264 away from the first abutment 240, such that the two second abutting cams 2460 of the second abutment 246 respectively cooperate with the second cam 2646 of the second link 264 and the fourth cam 2686 of the fourth link 268.

[0100] The linkage 28 is placed on the second mounting portion 224 of the base 221, so that the guide rail 2221 is slidably accommodated in the guide groove 2852 of the linkage 28. The two first anti-slip plates 2245 of the first anti-slip plate 2243 are respectively accommodated in the first anti-slip groove 2627 and the third anti-slip groove 2667 to restrict the movement of the first rotating part 2621 and the third rotating part 2661 along the connecting shaft 220. The two first shaft holes 2245a are respectively aligned with the first rotating hole 2624 and the third rotating hole 2664; the second anti-slip plate 2246... Two second anti-slip plates 2247 are respectively housed in the second anti-slip groove 2647 and the fourth anti-slip groove 2687 to restrict the movement of the second transition part 2571 and the fourth rotating part 2681 along the connecting shaft 220. Two second shaft holes 2247a are respectively aligned with the second rotating hole 2644 and the fourth rotating hole 2684. Two first elastic members 244 are placed on the side of the first abutment member 240 away from the first connecting rod member 262, and a washer 245 is placed on the end of the two first elastic members away from the first abutment member 240. The two connecting shafts 2247a are respectively aligned with the second rotating hole 2644 and the fourth rotating hole 2684. The 0 has a locking groove 2205, one end of which passes through two through holes 2242 of the base 221, the inner cavities of two annular pads 2451, the inner cavities of two first elastic members 244, the two first shaft holes 2410 of the first abutment member 240, the first rotating hole 2624 of the first connecting rod member 262 and the third rotating hole 2664 of the third connecting rod member 266, two first shaft holes 2245a, the first sliding hole 2811 and the second sliding hole 2833 of the linkage member 28, the second rotating hole 2644 of the second connecting rod member 264 and the first... The fourth rotating hole 2684 of the four-link member 268 and the two second shaft holes 2465 of the second abutment member 246 are connected until the snap-fit ​​grooves 2205 of the two connecting shafts 220 are exposed on the side of the second abutment member 246 away from the second abutment member 264. The two C-shaped buckles 2491 of the snap-fit ​​piece 249 are respectively snapped into the snap-fit ​​grooves 2205 of the two connecting shafts 220, so that the cover body 2203 of the two connecting shafts 220 passes through the two through holes 2242 of the base 221 and abuts against the two annular pads 2451 of the pad 245. At this time, the two first elastic members 244 are elastically clamped between the gasket 245 and the first abutment member 240. The two first elastic members 244 elastically push the first abutment member 240 respectively, so that the two first abutting cams 242 abut against the first cam 2626 and the third cam 2666 respectively. The first connecting rod 262 and the second connecting rod 264 can only rotate synchronously around one of the connecting shafts 220 and cannot move along the axial direction of the connecting shaft 220. The third connecting rod 266 and the fourth connecting rod 268 can only rotate synchronously around the other connecting shaft 220 and cannot move along the axial direction of the connecting shaft 220. The linkage member 28 can slide along the guide rail 2221. The two second abutting cams 2460 abut against the second cam 2646 and the fourth cam 2686 respectively.

[0101] Positioning member 27 is placed on the third mounting portion 226 of base 221, with the third arc groove 2721 facing the first mounting portion 223, and the two guide sliders 2262 of base 221 are slidably accommodated in the two guide grooves 276 respectively; two second elastic members 248 are placed between positioning member 27 and snap-fit ​​piece 249, so that two connecting posts 2724 are snapped into the inner cavity at the same end of the two second elastic members 248 respectively, and the ends of the two connecting shafts 220 are snapped into the inner cavity at the other end of the two second elastic members 248 respectively. The first rotating part 2512 is placed in the first auxiliary rotating groove 2236 of the base 221, so that the first arc rails 2511 at opposite ends of the first rotating part 2512 are rotatably accommodated in the first arc groove 2233 and one of the third arc grooves 2721 of the positioning member 27; the second rotating part 2562 is placed in the second auxiliary rotating groove 2237 of the base 221, so that the second arc rails 2561 at opposite ends of the second rotating part 2562 are rotatably accommodated in the second arc groove 2235 and the other third arc groove 2721 of the positioning member 27. The first link assembly 261 is slidably housed in the first guide groove 2526 of the first connector 252, such that the first slide rail 2620 and the second slide rail 2640 are slidably inserted into the two first slide grooves 2520 of the first connector 252; the second link assembly 265 is slidably housed in the second guide groove 2576 of the second connector 257, such that the third slide rail 2660 and the fourth slide rail 2680 are slidably inserted into the two second slide grooves 2570 of the second connector 257. At this time, the two opposite ends of the second elastic member 248 elastically push against the positioning member 27 and the snap-fit ​​piece 249 respectively, so that the positioning member 27 abuts against the first rotating member 251 and the second rotating member 256, and the first rotating member 251 and the second rotating member 256 abut against the first protrusion 2232 and the second protrusion 2234 of the base 221 respectively. At the same time, the two second abutting cams 2460 of the first abutting member 246 abut against the second cam 2646 and the fourth cam 2686 respectively.The first elastic element 244 and the second elastic element 248 together compress the first connecting rod assembly 261 and the second connecting rod assembly 265, thereby enabling the engagement between the first abutting helical surface 2633 and the second abutting helical surface 2634 of the first connecting rod 262 and the first helical surface 2841 and the second helical surface 2842 of the first sliding part 281, respectively; the engagement between the third abutting helical surface 2637 and the fourth abutting helical surface 2638 of the second connecting rod 264 and the third helical surface 2843 and the fourth helical surface 2638 of the first sliding part 281, respectively; and the engagement between the first abutting helical surface 2637 and the fourth abutting helical surface 2638 of the second connecting rod 264 and the first abutting helical surface 2638 of the second connecting rod 264. The fit between the second abutting spiral surface 2634 and the first spiral surface 2841 and the second spiral surface 2842 of the second sliding part 283, respectively, and the fit gap between the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the fourth connecting rod 268 and the third spiral surface 2843 and the fourth spiral surface 2638 of the second sliding part 283, respectively, will be squeezed and reduced as much as possible. This ensures that the first connecting rod assembly 261 and the second connecting rod assembly 265 are tightly fitted with the linkage member 28 during the rotation of the connecting shaft 220, and reduces the asynchronous effect caused by the fit gap. When the first rotating member 251 and the second rotating member 256 rotate relative to the base 221, the linkage member 28 slides relative to the base 221 to achieve synchronous reverse rotation of the first linkage assembly 261 and the second linkage assembly 265. The first rotating member 251 and the second rotating member 256 have frictional resistance with the base 221, and the first rotating member 251 and the second rotating member 256 have frictional resistance with the positioning member 27. The two first abutting cams 242 of the first abutting member 240 have frictional torque with the first cam 2626 and the third cam 2666, and the two second abutting cams 2460 of the second abutting member 246 have frictional torque with the second cam 2646 and the fourth cam 2686, respectively. These frictional resistances and frictional torques are used to limit the rotation of the first rotating member 251 and the second rotating member 256 relative to the base 221.

[0102] Please refer to the following: Figures 24-28The structure of the second folding mechanism 24a is similar to that of the first folding mechanism 24, except that the second folding mechanism 24a omits the second elastic element 248 and the positioning element 27, and the structure of the first mounting part 223a of the second folding mechanism 24a is slightly different from that of the first mounting part 223 of the first folding mechanism 24. The base 221a of the second folding mechanism 24a includes a support bar 222, a first mounting part 223a, and a second mounting part 224. That is, the base 221a of the second folding mechanism 24a omits the third mounting part 226, thereby reducing the overall length of the base 221a. The first mounting part 223a is located at one end of the support bar 222, and the second mounting part 224 is located at the opposite end of the support bar 222. The first mounting portion 223a includes a pair of first protrusions 2232 spaced apart from each other and a pair of second protrusions 2234 spaced apart from each other. The pair of first protrusions 2232 are located on one side of the support bar 222 and are arranged along the length direction of the support bar 222. The pair of second protrusions 2234 are located on the opposite side of the support bar 222 and are arranged along the length direction of the support bar 222. The sides of the pair of first protrusions 2232 facing each other are respectively provided with first arc grooves 2233. The end of each first arc groove 2233 passes through the front of the corresponding first protrusion 2232, and the two first arc grooves 2233 are coaxial. The sides of the pair of second protrusions 2234 facing each other are respectively provided with second arc grooves 2235. The end of each second arc groove 2235 passes through the front of the corresponding second protrusion 2234, and the two second arc grooves 2235 are coaxial. The axis of the first arc grooves 2233 is parallel to the axis of the second arc grooves 2235. The front of the first mounting part 223a has a first auxiliary rotation groove 2236 and a second auxiliary rotation groove 2237 on opposite sides. Optionally, the inner surfaces of the first auxiliary rotation groove 2236 and the second auxiliary rotation groove 2237 are arc-shaped. The first auxiliary rotation groove 2236 is located between a pair of first protrusions 2232, and the axis of the first auxiliary rotation groove 2236 is collinear with the axis of the first arc groove 2233. The second auxiliary rotation groove 2237 is located between a pair of second protrusions 2234, and the axis of the second auxiliary rotation groove 2237 is collinear with the axis of the second arc groove 2235. Adjusting rods 2210 are provided on opposite sides of the end face of the first mounting part 223a away from the second mounting part 224. The axes of the two adjusting rods 2210 are parallel to the axis of the first arc groove 2233.

[0103] In other embodiments, such as Figure 25As shown, the first mounting portion 223a of the base 221 is separated along line L1 to form two mounting blocks that can be spliced ​​together. The two mounting blocks are placed on opposite sides of the first rotating portion 2512 and the second rotating portion 2562, so that the two first arc rails 2511 are respectively accommodated in the two first arc grooves 2233, and the two second arc rails 2561 are respectively accommodated in the two second arc grooves 2235. The two mounting blocks are then fixedly connected by welding, snap-fitting or gluing.

[0104] In other embodiments, such as Figure 26 As shown, in order to eliminate the fit gap between the linkage 28 and the first link assembly 261 and the second link assembly 265 on the double helix surface, the linkage 28 can be separated along line L2 to form two linkage blocks that can be spliced ​​together. After the two linkage blocks are assembled with the first link assembly 261 and the second link assembly 265 respectively, the two linkage blocks are fixedly connected by welding, snap-fitting or gluing. Alternatively, the two linkage blocks can be welded first and then assembled with the first link assembly 261 and the second link assembly 265 respectively.

[0105] Please refer to the following: Figures 4-9 , Figures 24-25 and Figures 29-34When assembling the support mechanism 23 onto the base 221, the multiple support portions 2312 of the side support member 231 are respectively inserted into the multiple clearance slots 2347 of the middle support member 234, and the multiple rotating shafts 2346 are respectively rotatably inserted into the multiple rotating holes 2311, so that the two side support members 231 and the two middle support members 234 are respectively rotatably connected through the rotating shafts 2346; the two first folding mechanisms 24 and the one second folding mechanism 24a are placed on the back of the support mechanism 23, and the two first folding mechanisms 24 and the one second folding mechanism 24a are arranged along the length direction of the side support member 231, so that the two adjusting rods 2210 of each base 221 are respectively inserted into the corresponding adjusting slots 2340 of the two middle support members 234; the two side support members 231 are respectively placed on the first rotating mechanism 250. The front of the first link assembly 261 and the front of the second rotating mechanism 255 allow the first positioning rod 2527 of the first link assembly 261 to rotate and slide into the positioning groove 2317 of one side support member 231, and the second positioning rod 2577 of the second link assembly 255 to rotate and slide into the positioning groove 2317 of the other side support member 231. The first rotating rails 2310 of the two side support members 231 are respectively rotatably accommodated in the first rotating groove 2522 of the first connector 252 and the second rotating groove 2572 of the second connector 257. The first limiting rod 2623 of the first link assembly 261 is rotatably accommodated in the limiting groove 2315 of one side support member 231, and the second limiting rod 2663 of the second link assembly 265 is rotatably accommodated in the limiting groove 2315 of the other side support member 231. Multiple bases 221 are fixedly connected to the back shell 29. Specifically, positioning pins 293 are inserted into the connecting holes on the back of the base 221, and the base 221 is fixedly connected to the back shell 29 by gluing or welding. At this time, a through groove 2211 is formed between the support mechanism 23 and the back shell 29 between two adjacent folding mechanisms. The through groove 2211 is used for the flexible circuit board to pass through. In this embodiment, a through groove 2211 is formed between the second folding mechanism 24a and the adjacent first folding mechanism 24. The second folding mechanism 24a omits the second elastic element 248 and the positioning element 27 based on the first folding mechanism 24. The second folding mechanism 24a has a shorter length in the axial direction parallel to the connecting shaft 220, and the width of the through groove 2211 is larger, which can meet the requirements for the flexible circuit board to pass through.

[0106] At this time, the two first abutting cams 242 of the first abutting member 240 abut against the first cam 2626 and the third cam 2666 respectively, and the two second abutting cams 2460 of the second abutting member 246 abut against the second cam 2646 and the fourth cam 2686 respectively. When the first connecting rod assembly 261 and / or the second connecting rod assembly 265 rotates relative to the base 221 about the corresponding connecting shaft 220, the first rotating member 251 and the second rotating member 256 have frictional resistance with the base 221 and the positioning member 27 respectively, the two first abutting cams 242 of the first abutting member 240 have frictional torque with the first cam 2626 and the third cam 2666 respectively, and the two second abutting cams 2460 of the second abutting member 246 have frictional torque with the second cam 2646 and the fourth cam 2686 respectively. Resistance and frictional torque prevent the first link assembly 261 and the second link assembly 265 from rotating relative to the base 221. Without external force, the first link assembly 261 and the second link assembly 265 are limited relative to the base 221. The rotation of the first link assembly 261 or the second link assembly 265 can drive the linkage 28 to move axially along the connecting shaft 220, so as to realize the synchronous folding or flattening of the first link assembly 261 and the second link assembly 265. The support mechanism 23 folds or flattens with the first folding mechanism 24 and the second folding mechanism 24a.

[0107] When the support mechanism 23 is fully flattened, the first rotating mechanism 250 and the second rotating mechanism 255 are also fully flattened, as are the first connecting rod assembly 261 and the second connecting rod assembly 265. The two adjusting rods 2210 of each base 221 are respectively positioned at the first positioning segments 2341 corresponding to the two central support members 234. The first positioning rod 2527 of the first connector 252 is positioned at the first end 2317a of the corresponding positioning groove 2317, and the second positioning rod 2577 of the second connector 257 is positioned at the first end 2317a of the corresponding positioning groove 2317. The first limiting rod 2623 of the first connecting rod assembly 261 is positioned at the first limiting segment 2315a of the corresponding limiting groove 2315, and the second limiting rod 2663 of the second connecting rod assembly 265 is positioned at the first limiting segment 2315a of the corresponding limiting groove 2315. Furthermore, the support portions 2312 of the two side support members abut against the back of the two central support members 234. The first anti-rotation block 2648 of the second linkage 264 and the second anti-rotation block 2688 of the fourth linkage 268 respectively stop at the two first positioning surfaces 2248a of the base 221; the first elastic member 244 pushes against the first abutting member 240 against the first linkage 262 and the second linkage 264, so that the two first abutting cams 242 have frictional resistance with the first cam 2626 and the third cam 2666 respectively, and the second abutting cam 2460 has frictional resistance with the second cam 2646 and the second cam 2626 and the third cam 2666 respectively. There is frictional resistance between the fourth cams 2686, and the second elastic member 248 pushes the positioning member 27 against the first rotating member 251 and the second rotating member 256, so that the first rotating member 251 and the second rotating member 256 have frictional resistance with the positioning member 27 and the base 221 respectively. These frictional resistances keep the support mechanism 23 in a completely flat state; the first front surface 2342a of the two central support plates 2342 and the second front surface 2313a of the two side support members 231 are coplanar.

[0108] When the support mechanism 23 is in a fully folded state, the first rotating mechanism 250 and the second rotating mechanism 255 are also fully folded, as are the first connecting rod assembly 261 and the second connecting rod assembly 265. The two adjusting rods 2210 of each base 221 are respectively positioned at the second positioning sections 2343 corresponding to the two central support members 234. The first positioning rod 2527 of the first connecting member 252 is positioned at the second end 2317b of the corresponding positioning groove 2317, and the second positioning rod 2577 of the second connecting member 257 is positioned... The second end 2317b of the corresponding positioning groove 2317 is located; and the first limiting rod 2623 of the first connecting rod assembly 261 is positioned in the second limiting segment 2315b of the corresponding limiting groove 2315, the second limiting rod 2663 of the second connecting rod assembly 265 is positioned in the second limiting segment 2315b of the corresponding limiting groove 2315, and the first anti-rotation block 2648 of the second connecting rod 264 and the second anti-rotation block 2688 of the fourth connecting rod 268 respectively stop on the two second positioning surfaces 2248b of the base 221; The central support member 234 is bent relative to the pair of side supports 231, and the central support member 234 is bent relative to the base 221, thereby increasing the receiving space 236 enclosed by the pair of central supports 234 and the pair of side supports 231; the first elastic member 244 pushes against the first abutting member 240 and abuts against the first connecting rod 262 and the second connecting rod 264, so that the two first abutting cams 242 have frictional resistance with the first cam 2626 and the third cam 2666 respectively, and the second abutting cam 2460 has frictional resistance with the first cam 2626 and the third cam 2666 respectively. There is frictional resistance between the second cam 2646 and the fourth cam 2686, and the second elastic member 248 pushes the positioning member 27 against the first rotating member 251 and the second rotating member 256, so that the first rotating member 251 and the second rotating member 256 have frictional resistance with the positioning member 27 and the base 221 respectively. These frictional resistances are used to keep the support mechanism 23 in a fully folded state; the first front face 2342a of the two central support members 234 and the second front face 2313a of the two side support members 231 form a teardrop-shaped space.When the two central support members 234 and the two side support members 231 are in the intermediate state, the first linkage assembly 261 and the second linkage assembly 265 rotate synchronously relative to the base 221 and fold to a specific angle. The linkage member 28 slides along the connecting shaft 220. The first rotating mechanism 250 and the second rotating mechanism 255 rotate synchronously relative to the base 221 and fold to a specific angle. The two first abutting cams 242 have frictional resistance with the first cam 2626 and the third cam 2666 respectively. The two second abutting cams 2460 have frictional resistance with the second cam 2646 and the fourth cam 2686 respectively. The first rotating member 251 and the second rotating member 256 have frictional resistance with the base 221 and the positioning member 27 respectively. Without external force, the two side support members 231 and the two central support members 234 can be maintained in any folded state other than the fully flattened state and the fully folded state, so that the electronic device 100 is in any hovering state.

[0109] It should be noted that: the fully flattened state refers to the front faces of the two side support members 231 and the two middle support members 234 being coplanar, that is, the angle between the front faces of the side support members 231 and the middle support members 234 is 180 degrees, and the angle between the front faces of the two middle support members 234 is 180 degrees; the fully folded state refers to the front faces of the two side support members 231 and the two middle support members 234 forming a teardrop-shaped space; the intermediate state is any folded state other than coplanarity and teardrop-shaped space formed by the front faces of the two side support members 231 and the two middle support members 234, that is, the folded state of the electronic device 100 where the angle between the front faces of the two frames 21 is greater than 0 degrees and less than 180 degrees.

[0110] Please refer to the following: Figures 1-13 and Figures 35-50When the rotating shaft device 22 is folded from its flattened state, the first rotating mechanism 250 rotates relative to the base 221 toward the second rotating mechanism 255, causing the two first arc tracks 2511 of the first rotating member 251 of the first folding mechanism 24 to rotate within the first arc groove 2233 of the base 221 and one of the third arc grooves 2721 of the positioning member 27, respectively. Simultaneously, the two first arc tracks 2511 of the first rotating member 251 of the second folding mechanism 24a rotate within the two first arc grooves 2233 of the base 221a, respectively. The first connecting member 252 drives the first connecting rod assembly 261 to rotate relative to the base 221 toward the second connecting rod assembly 265 along the axis of the corresponding connecting shaft 220. The first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the first rotating part 2621 slidably abut against the first spiral surface 2841 and the second spiral surface 2842 of the first sliding part 281, respectively. The third abutting spiral surface 2633 of the second rotating part 2641... 37 and the fourth abutting spiral surface 2638 slidably abut against the third spiral surface 2843 and the fourth spiral surface 2844 of the first sliding part 281, causing the linkage 28 to slide on the base along the axial direction of the connecting shaft 220 in the first direction, causing the first spiral surface 2841 and the second spiral surface 2842 of the second sliding part 283 to slidably abut against the first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the third rotating part 2661, and the third spiral surface 2843 and the fourth spiral surface 2844 of the second sliding part 283 to slidably abut against the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the fourth rotating part 2681, causing the first connecting rod assembly 261 and the second connecting rod assembly 265 to rotate synchronously around a pair of connecting shafts 220 and move closer to each other; the first connecting rod assembly 261 and the second connecting rod assembly 265 synchronously drive the first rotating mechanism 250 and the second rotating mechanism 255 to rotate relative to the base 221 and move closer to each other. Simultaneously, during the mutual approach and rotation of the first rotating mechanism 250 and the second rotating mechanism 255, the first connecting member 252 and one side support member 231 are engaged through the rotational cooperation of the first rotating rail 2310 and the first rotating groove 2522, and the rolling cooperation of the first positioning rod 2527 and the corresponding positioning groove 2317. The second connecting member 257 and the other side support member 231 are engaged through the rotational cooperation of the first rotating rail 2310 and the second rotating groove 2572, and the rolling cooperation of the second positioning rod 2577 and the corresponding positioning groove 2317. The slot 2317 rolls into contact with the first limiting rod 2623 of the first connecting rod assembly 261 and the second limiting rod 2663 of the second connecting rod assembly 265, respectively, rotating and sliding in the limiting slots 2315 of the two side supports 231, so that the two middle supports 234 rotate relative to the two side supports 231, and the adjusting rod 2210 of the base 221 rolls along the corresponding adjusting groove 2340 until the two side supports 231 and the two middle supports 234 bend into a teardrop shape.Specifically, the first positioning rod 2527 rolls from the first end 2317a to the second end 2317b of the corresponding positioning groove 2317, while the second positioning rod 2577 rolls from the first end 2317a to the second end 2317b of the corresponding positioning groove 2317; the first limiting rod 2623 rolls from the first limiting segment 2315a to the second limiting segment 2315b of the corresponding limiting groove 2315, while the second limiting rod 2663 rolls from the first limiting segment 2315a to the second limiting segment 2315b of the corresponding limiting groove 2315; the adjusting rod 2210 rolls from the first positioning segment 2341 of the corresponding adjusting groove 2340 through the middle segment 2345 to the second positioning segment 2343, so that the two side supports 231 move away from each other, and the two middle supports 234 move away from each other, until the adjustment... The link 2210 is limited to the second positioning section 2343, the first positioning rod 2527 and the second positioning rod 2577 are respectively positioned in the two second limiting sections 2315b, the first anti-rotation block 2648 of the second connecting rod 264 and the second anti-rotation block 2688 of the fourth connecting rod 268 respectively stop on the two second positioning surfaces 2248b of the base 221; the two first abutting cams 242 of the first abutting member 240 respectively rotatably abut the first cam 2626 and the third cam 2666, the two second abutting cams 2460 of the second abutting member 246 respectively rotatably abut the second cam 2646 and the fourth cam 2686, the first connecting rod assembly 261 and the second connecting rod assembly 265 stop rotating, and the front of the two side support members 231 and the front of the two secondary support members 234 form a teardrop-shaped cross section.

[0111] During the bending process of the support mechanism 23, the first link assembly 261 and the second link assembly 265 rotate around the two connecting shafts 220 and move closer to each other. The first cam 2626 of the first link 262 and the third cam 2666 of the third link 266 rotatably abut against the two first abutting cams 242 of the first abutting member 240. The third cam 2666 of the second link 264 and the fourth cam 2686 of the fourth link 268 rotatably abut against the two second abutting cams 2460 of the second abutting member 246. At the same time, the first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the first rotating part 2621 slide against the first spiral surface 2841 and the second spiral surface 284 of the first sliding part 281. 2. The third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the second rotating part 2641 slidably abut the third spiral surface 2843 and the fourth spiral surface 2844 of the first sliding part 281, respectively. The first spiral surface 2841 and the second spiral surface 2842 of the second sliding part 283 slidably abut the first abutting spiral surface 2633 and the second abutting spiral surface 2634 of the third rotating part 2661, respectively. The third spiral surface 2843 and the fourth spiral surface 2844 of the second sliding part 283 slidably abut the third abutting spiral surface 2637 and the fourth abutting spiral surface 2638 of the fourth rotating part 2681, respectively. This causes the linkage 28 to slide along the axial direction of the connecting shaft 220 in the first direction, thereby realizing the synchronous folding of the support mechanism 23.Therefore, compared to existing rotating shaft devices that generally use four-gear transmission to achieve synchronous and opposite rotation, which are complex to manufacture and assemble, costly, and subject to wear on the gear surfaces during operation, thus affecting functionality, the linkage mechanism of the rotating shaft device 22 in this application does not require gear meshing. This simplifies the structure of the rotating shaft device 22, reduces manufacturing costs, and decreases its overall size, which is beneficial for the miniaturization of the rotating shaft device 22 and the lightweight and miniaturization of the electronic device 100. Secondly, the miniaturization trend in existing rotating shaft devices reduces the size of the gears, which not only increases the difficulty of processing and manufacturing but also results in insufficient torque to achieve the opening and closing feel and hovering effect. When the first cam 2626 and the third cam 2666 of the rotating shaft device 22 rotate relative to the two first abutting cams 242, the frictional resistance between the first cam 2626 and the corresponding first abutting cam 242, and the friction between the second cam 2646 and the corresponding second abutting cam 2460 are respectively... The frictional resistance between the third cam 2666 and the corresponding first abutting cam 242, the frictional resistance between the fourth cam 2686 and the corresponding second abutting cam 2460, and the frictional resistance between the first rotating member 251 and the second rotating member 256 and the base 221 and the positioning member 27 respectively, enables the first rotating member 251 and the second rotating member 256 to be positioned relative to the base 221, and the first link assembly 261 and the second link assembly 265 to be positioned relative to the base 221, so that the first rotating member 251 and the second rotating member 256 are positioned relative to the base 221 at any angle between 0 degrees and 90 degrees; at the same time, it enables the two side support members 231 to be positioned relative to the base 221 at any angle between 0 degrees and 120 degrees, and the middle support member 234 to be positioned relative to the side support members 231 at any angle between 0 degrees and 90 degrees, so that the electronic device 100 can achieve a large-angle hovering.

[0112] In other folding configurations of the rotating shaft device 22, the second rotating mechanism 255 can be rotated relative to the base 221 toward the first rotating mechanism 250, or the first rotating mechanism 250 and the second rotating mechanism 255 can be rotated together relative to the base 221 in opposite directions. The relative motion relationships of the components are similar to those in the above embodiment, and therefore will not be described further.

[0113] When the rotating shaft device 22 is unfolded from its fully folded state, the movement process of each component is the reverse of that when the rotating shaft device 22 is folded from its unfolded state, which will not be described in detail here.

[0114] The first connecting rod 262, the second connecting rod 264, the third connecting rod 266, and the fourth connecting rod 268 of the rotating shaft device 22 of this application are respectively engaged with the linkage member 28 through a double helical curved surface. Compared with the single helical curved surface engagement, this can more stabilize the concentricity of the engagement between the first connecting rod 262 and the second connecting rod 264 and the first sliding part 281, as well as the concentricity of the engagement between the third connecting rod 266 and the fourth connecting rod 268 and the second sliding part 283. This also has a limiting effect in the axial direction of the connecting shaft 220, which is more conducive to the stable and synchronous reverse rotation of the first connecting rod assembly 261 and the second connecting rod assembly 265.

[0115] In other embodiments, first folding aids 24 may be assembled at opposite ends of the back side of the support mechanism 23, and a second folding aid 24a may be installed between the two first folding aids 24 on the back side of the support mechanism 23. In other embodiments, the second folding aid 24a may be omitted, and only the first folding aids 24 may be assembled at opposite ends of the back side of the support mechanism 23.

[0116] In other embodiments, a first folding mechanism 24 is provided at opposite ends of the back side of the support mechanism 23, and a second folding mechanism 24a is provided between the two first folding mechanisms 24 on the back side of the support mechanism 23. The second folding mechanism 24a omits the linkage mechanism, the first abutment 240, the second abutment 246 and the first elastic member 244, thereby reducing the length of the second folding mechanism 24a in the axial direction of the connecting shaft 220, thereby increasing the length of the through groove 2211 between the second folding mechanism 24a and the first folding mechanism 24, which facilitates the insertion of the flexible circuit board.

[0117] like Figures 1-2As shown, the installed pivot device 22 is placed between two frames 21, and the opposite sides of the pivot device 22 are fixedly connected to the two frames 21 respectively. Specifically, the two side support members 231 on opposite sides of the back shell 29 are respectively accommodated in the mounting grooves 216 of the two frames 21, and the first connector 252 is connected to one frame 21, and the second connector 257 is connected to the other frame 21. At this time, the front faces 211 of the two frames 21, the first front faces 2342a of the two central support members 234, and the second front faces 2313a of the two side support members 231 are coplanar. The back of the flexible screen 30 is connected to the front faces 211 of the two frames 21 and the front face of the pivot device 22. Specifically, the bendable area 31 is connected to the second front surface 2313a of the two side supports 231 and the first front surface 2342a of the two central supports 234 of the rotating shaft device 22 via an adhesive 301. The two non-bendable areas 33 are respectively attached to the front surface 211 of the two frames 21. The adhesive 301 includes a first adhesive strip 302 and a second adhesive strip 304. The shape of the first adhesive strip 302 is the same as the shape of the second front surface 2313a of the side supports 231, and the shape of the second adhesive strip 304 is the same as the shape of the first front surface 2342a of the central supports 234. The first adhesive strip 302 connects the bendable area 31 and the side supports 231, and the second adhesive strip 304 connects the bendable area 31 and the central supports 234.

[0118] Compared to existing rotating shaft devices that achieve synchronous linkage through gear sets, where gear sets occupy a large amount of internal space in the thickness direction of the rotating shaft device, making it possible to place only the hinge back shell below the existing rotating shaft device, and other connecting parts cannot pass through the synchronization mechanism to achieve the connection between the two frames; the rotating shaft device 22 of this application has a smaller overall volume, thus reducing the internal space occupied by the rotating shaft device 22 in the folding housing 20, so as to leave more space for the stacking of batteries, motherboards, etc., and is conducive to the layout of other components such as motherboards or batteries, which is conducive to the miniaturization and thinning of electronic device 100. Secondly, a through groove 2211 is formed between the two mutually spaced-apart auxiliary rotating mechanisms on the back of the support mechanism 23, which facilitates the passage of the flexible circuit board and the layout of electronic components. In addition, the rotating shaft device 22, through the frictional resistance between the first abutment member 240 and the second abutment member and the first connecting rod assembly 261 and the second connecting rod assembly 265 respectively, and the frictional resistance between the first rotating member 251 and the second rotating member 256 and the base 221 and the positioning member 27 respectively, allows the bendable area 31 of the flexible screen 30 to be positioned at any bending angle, thereby enabling the two frames 21 to be freely adjusted in the unfolded state, folded state, and intermediate state, that is, the electronic device 100 can be positioned in the unfolded state, folded state, and any intermediate state. Furthermore, the first connecting rod assembly 261, the linkage member 28, and the second connecting rod assembly 265 are all sleeved on a pair of connecting shafts 220, making the connection of each component more stable, and the parts are less likely to break when the rotating shaft device 22 is dropped, thus improving the rigidity of each component.

[0119] The rotating shaft device 22 of the electronic device 100 of the present invention can realize the synchronous reverse rotation of the two side support members 231 and the two middle support members 234 through the linkage member 28 disposed between the first linkage assembly 261 and the second linkage assembly 265, which is convenient to operate. The rotating shaft device 22 has fewer components, simple structure, and low manufacturing cost. The thickness of the linkage member 28 is small, which reduces the internal space occupied by the rotating shaft device 22 in the folding shell 20 and reduces the overall thickness of the rotating shaft device 22, which is conducive to the thinner development of the electronic device 100. Secondly, the frictional resistance between the first cam 2626 of the first connecting rod 262 and the third cam 2666 of the third connecting rod 266 and the two first abutting cams 242 respectively, the frictional resistance between the second cam 2646 of the second connecting rod 264 and the fourth cam 2686 of the fourth connecting rod 268 and the two second abutting cams 2460 respectively, the frictional resistance between the first rotating member 251 and the base 221 and the positioning member 27, and the frictional resistance between the second rotating member 256 and the base 221 and the positioning member 27, makes the bendable area 31 of the flexible screen 30 fixed. The hinge device 22 is positioned at any bending angle to ensure that it maintains sufficient torque to achieve a smooth opening and closing feel and a hovering effect. This allows the two frames 21 to be freely adjusted in the unfolded, folded, and intermediate states. In other words, the electronic device 100 can be positioned in the unfolded, folded, and any intermediate state, giving the two frames 21 of the electronic device 100 a hovering function from 0 degrees to 180 degrees, with a large hovering angle range. In addition, the flexible circuit board can pass through the through slot 2211 of the hinge device 22 so that the flexible circuit board can be electrically connected to the electronic devices in the two frames 21.

[0120] The above are the embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A rotational coupling device, characterized by The rotating shaft device comprises: The rotating mechanism comprises a rotating member and a connecting member rotatably connected to the rotating member, and an axis of rotation between the rotating member and the connecting member is parallel to an axis of rotation between the middle support and the side support. The support mechanism comprises a side support and a middle support rotatably connected, and a side of the side support away from the middle support is rotatably connected to the rotating mechanism through cooperation of a first rotating rail and a first rotating groove. When the side support and the middle support are in an unfolded state, the adjusting rod is positioned at the first positioning section; when the side support and the middle support are in a folded state, the adjusting rod is positioned at the second positioning section.

2. The rotational shaft device according to claim 1, characterized by The adjusting groove is arranged on the back of the middle support, the first positioning section is closer to the side support than the second positioning section, the adjusting rod is arranged on the base, and an axial direction of the adjusting rod is parallel to the axis of rotation between the middle support and the side support.

3. The rotational shaft device according to claim 2, characterized by The adjusting block is arranged on the back of the middle support, the first positioning section is closer to the front of the middle support than the second positioning section, and the adjusting rod is arranged on the base.

4. The rotational coupling device of claim 1, wherein The rotating mechanism comprises a rotating member and a connecting member rotatably connected to the rotating member, and an axis of rotation between the rotating member and the connecting member is parallel to an axis of rotation between the middle support and the side support.

5. The rotational shaft device according to claim 4, characterized by The connecting member and the side support are connected through cooperation of a positioning rod and a positioning groove, an axis of the positioning rod is parallel to the axis of rotation between the middle support and the side support, and the positioning groove comprises a first end and a second end at opposite ends thereof. The positioning rod is positioned at the first end when the side support and the middle support are in the unfolded state; and the positioning rod is positioned at the second end when the side support and the middle support are in the folded state.

6. The rotational shaft device according to claim 4, characterized by The first connecting rod assembly and the side support are connected through cooperation of a limiting rod and a limiting groove, an axis of the limiting rod is parallel to an axis of rotation of the middle support and the side support, and the limiting groove comprises a first limiting section and a second limiting section at opposite ends thereof, the first limiting section being farther away from the middle support than the second limiting section; The limiting rod is positioned at the first limiting section when the side support and the middle support are in the unfolded state; and the limiting rod is positioned at the second limiting section when the side support and the middle support are in the folded state.

7. A rotational coupling device according to any one of claims 1-6, characterized in that The assisting rotating mechanism further comprises a pair of connecting shafts connected to opposite sides of the base, the rotating mechanism comprises a first rotating mechanism and a second rotating mechanism, the first rotating mechanism and the second rotating mechanism are respectively rotatably connected to opposite sides of the base, The linkage mechanism further comprises a second connecting rod assembly and a linkage member, the first connecting rod assembly comprises a first rotating part and a second rotating part rotatably connected to one of the connecting shafts, the second connecting rod assembly comprises a third rotating part and a fourth rotating part rotatably connected to the other connecting shaft, the linkage member comprises a first sliding part between the first rotating part and the second rotating part, and a second sliding part between the third rotating part and the fourth rotating part, the first rotating part and the first sliding part, and the third rotating part and the second sliding part are respectively connected through cooperation of a first double helical surface group, the second rotating part and the first sliding part, and the fourth rotating part and the second sliding part are respectively connected through cooperation of a second double helical surface group; when the linkage member moves relative to the base along an axial direction of the connecting shaft, the first connecting rod assembly and the second connecting rod assembly synchronously and reversely rotate relative to the base.

8. The rotational coupling device of claim 7, wherein, The first double helical surface group comprises a first helical surface, a second helical surface, a first abutting helical surface and a second abutting helical surface, the same end of the first sliding part and the second sliding part is provided with the first helical surface and the second helical surface, a rotation direction of the first helical surface is opposite to that of the second helical surface, the first rotating part and the third rotating part are provided with the first abutting helical surface and the second abutting helical surface at end parts close to the linkage member, the first helical surface and the first abutting helical surface are rotatably connected to each other, and the second helical surface and the second abutting helical surface are rotatably connected to each other; The second double helical surface set comprises a third helical surface, a fourth helical surface, a third abutting helical surface and a fourth abutting helical surface, the first sliding part is provided with the third helical surface and the fourth helical surface at one end away from the first rotating part, the second sliding part is provided with the third helical surface and the fourth helical surface at one end away from the third rotating part, and the third helical surface has an opposite helical direction to the fourth helical surface; the second rotating part and the fourth rotating part are both provided with the third abutting helical surface and the fourth abutting helical surface at the end facing the linkage, the third helical surface and the third abutting helical surface are in mutual rotating cooperation, and the fourth helical surface and the fourth abutting helical surface are in mutual rotating cooperation.

9. The rotational coupling device of claim 8, wherein, The first abutting helical surface and the second abutting helical surface are arranged along the circumferences of the first rotating part and the third rotating part, the first abutting helical surface has an opposite helical direction to the second abutting helical surface, the first abutting helical surface is attached to the corresponding first helical surface, and the second abutting helical surface is attached to the corresponding second helical surface; the third abutting helical surface and the fourth abutting helical surface are arranged along the circumferences of the second rotating part and the fourth rotating part, the third abutting helical surface has an opposite helical direction to the fourth abutting helical surface, the third abutting helical surface is attached to the corresponding third helical surface, and the fourth abutting helical surface is attached to the corresponding fourth helical surface.

10. The rotational coupling device of claim 7, wherein, The first sliding part is provided with a first sliding hole, the second sliding part is provided with a second sliding hole, the first rotating part is provided with a first rotating hole, the second rotating part is provided with a second rotating hole, the third rotating part is provided with a third rotating hole, and the fourth rotating part is provided with a fourth rotating hole; one of the connecting shafts is arranged through the first sliding hole, the first rotating hole and the second rotating hole, and the other connecting shaft is arranged through the second sliding hole, the third rotating hole and the fourth rotating hole.

11. The rotational coupling device of claim 10, wherein, The front surface of the base is provided with a first anti-skid plate, opposite ends of the first anti-skid plate extend out of opposite sides of the base to form two first anti-skid pieces, each first anti-skid piece is provided with a first shaft hole, and the pair of connecting shafts are arranged through the two first shaft holes; the first rotating part is provided with a first anti-skid groove communicating with the first rotating hole, the third rotating part is provided with a third anti-skid groove communicating with the third rotating hole, and the two first anti-skid pieces are respectively accommodated in the first anti-skid groove and the third anti-skid groove to limit the movement of the first rotating part and the third rotating part along the connecting shafts.

12. The rotational coupling device of claim 10, wherein, The front surface of the base is provided with a second anti-skid plate, opposite ends of the second anti-skid plate extend out of opposite sides of the base to form two second anti-skid pieces, each of the second anti-skid pieces is provided with a second shaft hole, the pair of connecting shafts are respectively arranged in the two second shaft holes; the second rotating part is provided with a second anti-skid groove communicating with the second rotating hole, the fourth rotating part is provided with a fourth anti-skid groove communicating with the fourth rotating hole, the two second anti-skid pieces are respectively accommodated in the second anti-skid groove and the fourth anti-skid groove to limit the movement of the second rotating part and the fourth rotating part along the connecting shafts.

13. The rotational coupling device of claim 12, wherein, The opposite ends of the second anti-skid plate are respectively provided with positioning blocks, the positioning blocks include first positioning surfaces and second positioning surfaces, the second rotating part is provided with a first rotation stopping block on one side of the second anti-skid groove, the fourth rotating part is provided with a second rotation stopping block on one side of the fourth anti-skid groove; When the first linkage assembly and the second linkage assembly are in the unfolded state, the first rotation stopping block and the second rotation stopping block are respectively stopped by the two first positioning surfaces; when the first linkage assembly and the second linkage assembly are in the folded state, the first rotation stopping block and the second rotation stopping block are respectively abutted against the two second positioning surfaces.

14. The rotational coupling device of claim 7, wherein, The first linkage assembly further includes a first linkage part connected to the first rotating part and a second linkage part connected to the second rotating part, the second linkage assembly further includes a third linkage part connected to the third rotating part and a fourth linkage part connected to the fourth rotating part, the first linkage part is connected to the second linkage part, and the third linkage part is connected to the fourth linkage part.

15. The rotational coupling device of claim 7, wherein, The rotation assisting mechanism further includes a first abutting member and / or a second abutting member which are slidingly sleeved on the pair of connecting shafts, the first rotating part and / or the third rotating part are cooperated with the first abutting member through a first cam assembly, and the second rotating part and / or the fourth rotating part are cooperated with the second abutting member through a second cam assembly.

16. The rotational coupling device of claim 15, wherein, The rotation assisting mechanism further includes a first elastic member and / or a second elastic member, the first elastic member is used to abut the first abutting member against the first rotating part and the third rotating part, and the second elastic member is used to abut the second abutting member against the second rotating part and the fourth rotating part.

17. The rotational coupling device of claim 1, wherein, The back surface of the support mechanism is provided with at least two rotation assisting mechanisms which are spaced apart from each other, and a through groove is formed between adjacent two rotation assisting mechanisms.

18. A foldable housing characterized by, The folding shell includes the rotating shaft device and two frame bodies, the rotating shaft device is located between the two frame bodies, and opposite sides of the rotating shaft device are connected to the two frame bodies.

19. An electronic device, comprising: The electronic device includes a flexible screen, two frame bodies and the rotating shaft device, the rotating shaft device is located between the two frame bodies, opposite sides of the rotating shaft device are connected to the two frame bodies, and the flexible screen is connected to the front surfaces of the two frame bodies and the front surface of the rotating shaft device.

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