Rotating shaft device, folding housing and electronic device

Abstract

The application provides a rotating shaft device, which comprises a base, a first rotating mechanism, a second rotating mechanism, a first connecting rod, a second connecting rod and two middle supporting sheets. The first rotating mechanism comprises a first rotating piece and a first connecting piece which are rotatably connected to one side of the base. The second rotating mechanism comprises a second rotating piece and a second connecting piece which are rotatably connected to the other side of the base. One side of the first connecting rod is rotatably connected to the base, and the other side of the first connecting rod is slidably connected to the first connecting piece. One side of the second connecting rod is rotatably connected to the base, and the other side of the second connecting rod is slidably connected to the second connecting piece. The two middle supporting sheets are connected to the first connecting rod and the second connecting rod respectively, and the two middle supporting sheets can rotate with the first connecting rod and the second connecting rod respectively. The application also provides a folding shell and an electronic device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic devices, in particular to a hinge device for supporting a flexible screen, a folding housing provided with the hinge device, and an electronic device provided with the folding housing. BACKGROUND

[0002] The bendable flexible display screen of the folding screen device in the related art is generally supported by a hinge device. The existing hinge device generally comprises a supporting mechanism for supporting the flexible display screen, and a supporting plate is arranged between the flexible display screen and the supporting mechanism. The folding or unfolding of the supporting mechanism can drive the bendable flexible display screen to fold or unfold. The supporting mechanism generally comprises a middle supporting hinge joint and two side supporting hinge joints, and the two side supporting hinge joints are respectively arranged on the opposite sides of the middle supporting hinge joint. However, the total thickness of the middle supporting hinge joint, the side supporting hinge joint and the supporting plate is relatively large, which cannot meet the demand for thinning development of the folding screen device. SUMMARY

[0003] The present application provides a hinge device, a folding housing provided with the hinge device, and an electronic device provided with the folding housing.

[0004] The hinge device provided by the present application comprises a base, a first rotating mechanism, a second rotating mechanism, a first connecting rod, a second connecting rod and a pair of middle supporting plates. The first rotating mechanism comprises a first rotating member and a first connecting member. The first rotating member is rotatably connected to the first connecting member, and one end of the first rotating member away from the first connecting member is rotatably connected to one side of the base. The second rotating mechanism comprises a second rotating member and a second connecting member. The second rotating member is rotatably connected to the second connecting member, and one end of the second rotating member away from the second connecting member is rotatably connected to the opposite side of the base. One side of the first connecting rod is rotatably connected to one side of the base, and the side of the first connecting rod away from the base is slidably connected to the first connecting member. One side of the second connecting rod is rotatably connected to one side of the base, and the side of the second connecting rod away from the base is slidably connected to the second connecting member. One of the middle supporting plates is connected to the side of the first connecting rod close to the base and can rotate relative to the base with the first connecting rod, and the other middle supporting plate is connected to the side of the second connecting rod close to the base and can rotate relative to the base with the second connecting rod.

[0005] The application also provides a folding shell, which comprises a hinge device and two frame bodies. The hinge device comprises a base, a first rotating mechanism, a second rotating mechanism, a first connecting rod, a second connecting rod and a pair of middle supporting plates. The first rotating mechanism comprises a first rotating piece and a first connecting piece. The first rotating piece is rotatably connected to the first connecting piece. One end of the first rotating piece, which is away from the first connecting piece, is rotatably connected to one side of the base. The second rotating mechanism comprises a second rotating piece and a second connecting piece. The second rotating piece is rotatably connected to the second connecting piece. One end of the second rotating piece, which is away from the second connecting piece, is rotatably connected to the other side of the base. One side of the first connecting rod is rotatably connected to one side of the base. The side of the first connecting rod, which is away from the base, is slidably connected to the first connecting piece. One side of the second connecting rod is rotatably connected to one side of the base. The side of the second connecting rod, which is away from the base, is slidably connected to the second connecting piece. One of the middle supporting plates is connected to the side of the first connecting rod, which is close to the base, and can rotate relative to the base along with the first connecting rod. The other middle supporting plate is connected to the side of the second connecting rod, which is close to the base, and can rotate relative to the base along with the second connecting rod. The opposite sides of the hinge device are connected to the two frame bodies respectively.

[0006] The application also provides an electronic device, which comprises a flexible screen, two frame bodies and a hinge device. The hinge device comprises a base, a first rotating mechanism, a second rotating mechanism, a first connecting rod, a second connecting rod and a pair of middle supporting plates. The first rotating mechanism comprises a first rotating piece and a first connecting piece. The first rotating piece is rotatably connected to the first connecting piece. One end of the first rotating piece, which is away from the first connecting piece, is rotatably connected to one side of the base. The second rotating mechanism comprises a second rotating piece and a second connecting piece. The second rotating piece is rotatably connected to the second connecting piece. One end of the second rotating piece, which is away from the second connecting piece, is rotatably connected to the other side of the base. One side of the first connecting rod is rotatably connected to one side of the base. The side of the first connecting rod, which is away from the base, is slidably connected to the first connecting piece. One side of the second connecting rod is rotatably connected to one side of the base. The side of the second connecting rod, which is away from the base, is slidably connected to the second connecting piece. One of the middle supporting plates is connected to the side of the first connecting rod, which is close to the base, and can rotate relative to the base along with the first connecting rod. The other middle supporting plate is connected to the side of the second connecting rod, which is close to the base, and can rotate relative to the base along with the second connecting rod. The opposite sides of the hinge device are connected to the two frame bodies respectively. The flexible screen is connected to the two frame bodies and the hinge device.

[0007] The side support sheet and the middle support sheet of the hinge device replace the support mechanism and the support plate between the support mechanism and the bendable flexible display screen in the prior art, thereby reducing the thickness of the hinge device, reducing the overall thickness of the electronic device, and meeting the requirement of light and thin development of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings described in the following are related to some embodiments of the present application. Other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0009] Figure 1 is a perspective structural schematic diagram of an electronic device in an embodiment of the present application;

[0010] Figure 2 is Figure 1 is a perspective structural exploded schematic diagram of the folding housing and the flexible screen of the electronic device in

[0011] Figure 3 is Figure 2 is a perspective structural exploded schematic diagram of the folding housing in

[0012] Figure 4 is Figure 3 is a perspective structural exploded schematic diagram of the hinge device in

[0013] Figure 5 is Figure 4 is a perspective structural schematic diagram of the hinge device in from another angle;

[0014] Figure 6 is Figure 4 is a perspective structural exploded schematic diagram of the hinge device in

[0015] Figure 7 is Figure 5 is a perspective structural exploded schematic diagram of the hinge device in

[0016] Figure 8 is Figure 6 is a perspective structural enlarged diagram of one of the assisting mechanisms in

[0017] Figure 9 is Figure 8 is a perspective structural schematic diagram of the assisting mechanism in from another angle;

[0018] Figure 10 is Figure 8 is a perspective structural exploded schematic diagram of the assisting mechanism in

[0019] Figure 11 is Figure 9 is a perspective exploded view of the assisting mechanism in

[0020] Figure 12 is Figure 10 is a further perspective exploded view of the assisting mechanism in

[0021] Figure 13 is Figure 12 is a perspective view of the assisting mechanism in

[0022] Figure 14 is Figure 13 is a perspective view of one of the connecting seats in

[0023] Figure 15 is Figure 13 is a perspective view of one of the assisting support frames in

[0024] Figure 16 is Figure 4 is a perspective view of the pivot device in

[0025] Figure 17 is Figure 16 is a cross-sectional view of the pivot device in

[0026] Figure 18 is Figure 4 is a perspective view of the pivot device in

[0027] Figure 19 is Figure 18 is a cross-sectional view of the pivot device in

[0028] Figure 20 is Figure 4 is a perspective view of the pivot device in

[0029] Figure 21 is Figure 20 is a cross-sectional view of the pivot device in

[0030] Figure 22 is Figure 2 is a perspective view of the folding housing in

[0031] Figure 23 is Figure 22 is a side view of the folding housing in

[0032] Figure 24 is Figure 22 is a perspective view of the pivot device in

[0033] Figure 25 is Figure 24Figure 2 is a cross-sectional view of the rotary shaft device of Figure 1 ;

[0034] Figure 26 Figure 3 is a cross-sectional view of the rotary shaft device of Figure 1 ; Figure 25

[0035] Figure 27 Figure 4 is another cross-sectional view of the rotary shaft device of Figure 1 ; Figure 24

[0036] Figure 28 Figure 5 is a cross-sectional view of the rotary shaft device of Figure 1 ; Figure 27

[0037] Figure 29 Figure 6 is yet another cross-sectional view of the rotary shaft device of Figure 1 ; Figure 24

[0038] Figure 30 Figure 7 is a cross-sectional view of the rotary shaft device of Figure 1. Figure 29

[0039] MAIN REFERENCE NUMERALS:

[0040] ​​​​​100, electronic device; 20, folding housing; 30, flexible screen; 31, bendable area; 33, non-bendable area; 40, frame; 402, front surface; 404, side surface; 405, end surface; 406, mounting groove; 50, rotating shaft device; 501, side support sheet; 505, middle support sheet; 506, support sheet body; 507, connecting sheet body; 509, back cover; 5091, fixing groove; 51, rotating assisting mechanism; 510, base; 5101, first rotating groove; 5102, first protrusion; 5103, second rotating groove; 5104, second protrusion; 5105, avoiding space; 5107, connecting cylinder; 5108, connecting hole; 515, connecting shaft; 52, first rotating mechanism; 521, first rotating piece; 5210, first circular arc rail; 5211, first adapter; 5212, first fitting surface; 5213, first back surface; 5215, first rotating part; 5216, first rotating rail; 525, first connecting piece; 5250, first circular arc groove; 5251, first rotating part; 5252, first avoiding groove; 5253, first front surface; 5255, first guide sliding part; 5256, first avoiding space; 5257, first sliding groove; 5258, first rotating groove; 53, second rotating mechanism; 531, second rotating piece; 5310, second circular arc rail; 5311, second adapter; 5312, second fitting surface; 5313, second back surface; 5315, second rotating part; 5316, second rotating rail; 535, second connecting piece; 5350, second circular arc groove; 5351, second rotating part; 5352, second avoiding groove; 5353, second front surface; 5355, second guide sliding part; 5356, second avoiding space; 5357, second sliding groove; 5358, second rotating groove; 54, first connecting link; 541, first rotating part; 5410, first rotating hole; 5411, first support block; 5412, first support surface; 5414, first connecting surface; 5416, first rotating assisting column; 545, first sliding part; 5450, first sliding rail; 5452, first avoiding groove; 5453, first adjusting rod; 546, first connecting frame; 5460, first rotating assisting groove; 5460a, first abutting end; 5460b, second abutting end; 5461, first support part; 5462, first support strip; 5463, first connecting strip; 5465, first rotating sheet; 5466, first rotating opening; 556, second connecting frame; 5560, second rotating assisting groove; 5560a, third abutting part; 5560b, fourth abutting part; 5561, second support part; 5562, second support strip; 5563, second connecting strip; 5565, second rotating sheet; 5566, second rotating opening; 55, second connecting link; 551, second rotating part; 5510, second rotating hole; 5511, second support block; 5512, second support surface; 5514, second connecting surface; 5516, second rotating assisting column; 555, second sliding part;5550, second slide rail; 5552, second avoiding groove; 5553, second adjusting rod; 56, first connecting seat; 560, third abutting surface; 561, first rotating rail; 562, first adapter; 563, first adjusting groove; 5632, first positioning section; 5634, second positioning section; 564, first adjusting part; 566, first connecting part; 567, first sleeving groove; 57, second connecting seat; 570, fourth abutting surface; 571, second rotating rail; 572, second adapter; 573, second adjusting groove; 5732, third positioning section; 5734, fourth positioning section; 574, second adjusting part; 576, second connecting part; 577, second sleeving groove. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0042] In addition, the descriptions of the following embodiments are with reference to the additional drawings to illustrate the specific embodiments that can be used to implement the present application. The directional terms mentioned in the present application, such as “up”, “down”, “front”, “back”, “left”, “right”, “inner”, “outer”, “side” and the like, are only the directions of the additional drawings, therefore, the directional terms used are for better, clearer illustration and understanding of the present application, and are not indicative or implied that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connecting”, “connecting”, “arranged on” should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] Please refer to Figures 1 to 3The electronic device 100 in an embodiment of the present application comprises a folding shell 20 and a flexible screen 30 arranged on the folding shell 20. The folding shell 20 comprises two frame bodies 40 and a rotating shaft device 50 connected between the two frame bodies 40. The opposite sides of the rotating shaft device 50 are connected to the two frame bodies 40 respectively. The two frame bodies 40 are synchronously rotated by the rotating shaft device 50 to realize mutual folding or mutual unfolding. The flexible screen 30 comprises a bendable area 31 corresponding to the rotating shaft device 50 and two non-bendable areas 33 connected to the opposite sides of the bendable area 31. The flexible screen 30 is arranged on the front surface of the two frame bodies 40 and the front surface of the rotating shaft device 50. Specifically, the two non-bendable areas 33 of the flexible screen 30 can be fixed on the front surface of the two frame bodies 40 respectively, and the bendable area 31 is attached to the front surface of the rotating shaft device 50. The bendable area 31 of the flexible screen 30 can be bent or unfolded with the rotating shaft device 50. The flexible screen 30 can be, but is not limited to, a flexible display screen, a flexible touch screen, a flexible touch display screen and various flexible components with corresponding functions, or a flexible component fixedly attached to a flexible support plate, such as a flexible display screen attached to a flexible steel plate, a flexible touch screen and the like.

[0045] For reference Figures 4-9The rotation shaft device 50 comprises an assisting rotation mechanism 51, a pair of side supporting sheets 501, a pair of middle supporting sheets 505 and a back cover 509. The assisting rotation mechanism 51 comprises a base 510, a pair of connecting shafts 515, a first rotation mechanism 52, a second rotation mechanism 53, a first connecting rod 54 and a second connecting rod 55. The first rotation mechanism 52 comprises a first rotating piece 521 and a first connecting piece 525. The first rotating piece 521 is rotatably connected to the first connecting piece 525. An end of the first rotating piece 521, which is away from the first connecting piece 525, is rotatably connected to one side of the base 510. The second rotation mechanism 53 comprises a second rotating piece 531 and a second connecting piece 535. The second rotating piece 531 is rotatably connected to the second connecting piece 535. An end of the second rotating piece 531, which is away from the second connecting piece 535, is rotatably connected to the other side of the base 510. One side of the first connecting rod 54 is rotatably connected to one side of the base 510. The other side of the first connecting rod 54, which is away from the base 510, is slidably connected to the first connecting piece 525. One side of the second connecting rod 55 is rotatably connected to one side of the base 510. The other side of the second connecting rod 55, which is away from the base 510, is slidably connected to the second connecting piece 535. Specifically, the pair of connecting shafts 515 are connected to the opposite sides of one end of the base 510. One of the connecting shafts 515, to which the other side of the first connecting rod 54, which is away from the first connecting piece 525, is rotatably connected, is connected to the base 510. The other of the connecting shafts 515, to which the other side of the second connecting rod 55, which is away from the second connecting piece 535, is rotatably connected, is connected to the base 510. The two side supporting sheets 501 are respectively located on the opposite sides of the base 510. One of the side supporting sheets 501 is connected to the front surface of the first rotating piece 521 and can rotate with the first rotating piece 521 relative to the base 510. The other of the side supporting sheets 501 is connected to the front surface of the second rotating piece 531 and can rotate with the second rotating piece 531 relative to the base 510. One of the middle supporting sheets 505 is connected to the side of the first connecting rod 54, which is close to the base 510, and can rotate with the first connecting rod 54 relative to the base 510. The other of the middle supporting sheets 505 is connected to the side of the second connecting rod 55, which is close to the base 510, and can rotate with the second connecting rod 55 relative to the base 510. Thus, the pair of side supporting sheets 501 and the pair of middle supporting sheets 505 can be folded or unfolded relative to each other. When the rotation shaft device 50 is in the unfolded state, the front surfaces of the side supporting sheets 501 and the front surfaces of the middle supporting sheets 505 are coplanar. The back surface of the bendable area 31 of the flexible screen 30 is attached to the front surfaces of the side supporting sheets 501 and the front surfaces of the middle supporting sheets 505. When the rotation shaft device 50 is in the folded state, the front surfaces of the side supporting sheets 501 and the front surfaces of the middle supporting sheets 505 form a U-shaped space or a water-drop-shaped space. The bendable area 31 is bent and accommodated in the U-shaped space or the water-drop-shaped space. In this embodiment, the front surfaces of the side supporting sheets 501 and the front surfaces of the middle supporting sheets 505 form a water-drop-shaped space.

[0046] In the embodiment, the front surface refers to the surface with the same direction as the light-out surface of the flexible screen 30, and the back surface refers to the surface with the opposite direction as the light-out surface of the flexible screen 30. The electronic device 100 is, for example, but not limited to, a mobile phone, a tablet computer, a display, a liquid crystal panel, an OLED panel, a television, a smart watch, a VR head-mounted display, a vehicle-mounted display, and other any product and component with a display function.

[0047] When the hinge device 50 is folded, the first rotating mechanism 52 and the second rotating mechanism 53 rotate relative to the base 510 to approach each other, and the two side support sheets 501 rotate relative to the first rotating member 521 and the second rotating member 531 to approach each other; meanwhile, the first connecting member 525 drives the first connecting rod member 54 to rotate relative to the base 510, the second connecting member 535 drives the second connecting rod member 55 to rotate relative to the base 510, and the two middle support sheets 505 rotate relative to the first connecting rod member 54 and the second connecting rod member 55 to approach each other, until the two side support sheets 501 and the middle support sheets 505 form a water-drop-shaped space, and the bendable area 31 is bent along with the side support sheets 501 and the middle support sheets 505 and accommodated in the water-drop-shaped space. When the hinge device 50 is unfolded, the first rotating mechanism 52 and the second rotating mechanism 53 rotate relative to the base 510 to move away from each other, and the two side support sheets 501 rotate relative to the first rotating member 521 and the second rotating member 531 to move away from each other; meanwhile, the first connecting member 525 drives the first connecting rod member 54 to rotate relative to the base 510, the second connecting member 535 drives the second connecting rod member 55 to rotate relative to the base 510, and the two middle support sheets 505 rotate relative to the first connecting rod member 54 and the second connecting rod member 55 to move away from each other, until the front surface of the side support sheet 501 and the front surface of the middle support sheet 505 are coplanar, and the bendable area 31 is unfolded along with the side support sheets 501 and the middle support sheets 505.

[0048] The side support sheets 501 and the middle support sheets 505 of the hinge device 50 of the present application replace the support mechanism and the support plate between the support mechanism and the bendable flexible display screen in the prior art, thereby reducing the thickness of the hinge device 50 and the overall thickness of the electronic device 100, and meeting the requirement of thinning development of the electronic device 100.

[0049] Optionally, the thickness of the side support sheet 501 ranges from 0.03 mm to 0.50 mm, and specifically, the thickness of the side support sheet 501 can be, but is not limited to, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc.; the thickness of the middle support sheet 505 ranges from 0.03 mm to 0.50 mm, and specifically, the thickness of the middle support sheet 505 can be, but is not limited to, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc.

[0050] Optionally, the side support sheet 501 and the middle support sheet 505 can be, but are not limited to, stainless steel sheets, carbon fiber sheets, polyimide sheets, terylene resin sheets, etc. sheets with supporting effect.

[0051] As shown in FIG. 1, the flexible screen 30 comprises a bendable area 31 and a non-bendable area 33. The bendable area 31 is connected to the hinge device 50, and the non-bendable area 33 is connected to the front face 402 of the frame 40. Figure 2 As shown in FIG. 1, the flexible screen 30 comprises a bendable area 31 and a non-bendable area 33. The bendable area 31 is connected to the hinge device 50, and the non-bendable area 33 is connected to the front face 402 of the frame 40. Figure 7 As shown in FIG. 1, the flexible screen 30 comprises a bendable area 31 and a non-bendable area 33. The bendable area 31 is connected to the hinge device 50, and the non-bendable area 33 is connected to the front face 402 of the frame 40. As shown in FIG. 1, the frame 40 comprises a front face 402, a back face, two opposite side faces 404, and two end faces 405. The hinge device 50 is connected between the two side faces 404 of two adjacent frames 40. The bendable area 31 of the flexible screen 30 is attached to the front face of the hinge device 50, and the non-bendable area 33 of the flexible screen 30 is connected to the front face 402 of the frame 40. The front face 402 of each frame 40 is provided with a mounting groove 406 on the side close to the hinge device 50. One side of the mounting groove 406 penetrates the front face 402 of the frame 40, and the opposite ends of the mounting groove 406 penetrate the opposite end faces 405 of the frame 40. The opposite sides of the hinge device 50 are accommodated in the mounting grooves 406 of the two frames 40, that is, the first connecting piece 525 of the first rotating mechanism 52 is connected to the mounting groove 406 of one frame 40, and the second connecting piece 535 of the second rotating mechanism 53 is connected to the mounting groove 406 of the other frame 40. The back face of the frame 40 is provided with a plurality of accommodation spaces (not shown in the figure) for mounting circuit boards, batteries, and other electronic devices.

[0052] As shown in FIG. 1, the flexible screen 30 comprises a bendable area 31 and a non-bendable area 33. The bendable area 31 is connected to the hinge device 50, and the non-bendable area 33 is connected to the front face 402 of the frame 40. Figures 3-13As shown, the first rotation axis L1 between the first rotating member 521 and the first connecting member 525, the second rotation axis L2 between the first rotating member 521 and the base 510, and the third rotation axis L3 between the first connecting rod 54 and the base 510 are parallel to each other; the first rotation axis L1 between the second rotating member 531 and the second connecting member 535, the second rotation axis L2 between the second rotating member 531 and the base 510, and the third rotation axis L3 between the second connecting rod 55 and the base 510 are parallel to each other; the two first rotation axes L1 are located on opposite sides of the base 510, and the two second rotation axes L2 and the two third rotation axes L3 are located between the two first rotation axes L1.

[0053] The first rotating member 521 is rotatably connected with the first connecting member 525 through a first circular arc track and a first circular arc groove. The first circular arc track is arranged in one of the first rotating member 521 and the first connecting member 525, and the first circular arc groove is arranged in the other one of the first rotating member 521 and the first connecting member 525. In the embodiment, one end of the first connecting member 525 away from one side of the base 510 is provided with the first circular arc groove 5250, and one end of the first rotating member 521 away from the base 510 is provided with the first circular arc track 5210. Specifically, the first connecting member 525 includes the first rotating part 5251 and the first guide sliding part 5255 located at opposite ends of the first connecting member 525. The first front surface 5253 of the first rotating part 5251 is provided with the first avoiding groove 5252. The opposite sides of the first avoiding groove 5252 respectively penetrate the first front surface 5253 and the back surface of the first rotating part 5251. The first rotating part 5251 is provided with the first circular arc grooves 5250 spaced from each other at opposite end surfaces of the first avoiding groove 5252. The opposite ends of the first circular arc groove 5250 close to the base 510 respectively penetrate the first front surface 5253 and the back surface of the first rotating part 5251. The opposite ends of the first circular arc groove 5250 away from the base 510 respectively penetrate the first front surface 5253 and the side surface away from the base 510 of the first rotating part 5251. Optionally, the first front surface 5253 of the first rotating part 5251 is an inclined surface. The first rotating member 521 includes the first adapter part 5211 and the first rotating part 5215 located at opposite ends of the first rotating member 521. The first adapter part 5211 is rotatably connected with the first rotating part 5251. The first rotating member 521 has the first fitting surface 5212 and the first back surface 5213 away from the first fitting surface 5212. The first back surface 5213 is provided with the first circular arc track 5210. Specifically, the first back surface 5213 of the first adapter part 5211 away from one side of the first rotating part 5215 is provided with two first circular arc tracks 5210 spaced from each other. The two first circular arc tracks 5210 are rotatably inserted into the two first circular arc grooves 5250 respectively. Optionally, the first back surface 5213 of the first rotating part 5251 is an inclined surface. When the rotating shaft device 50 is in the folded state, the first front surface 5253 of the first connecting member 525 is fitted to the first back surface 5213 of the first rotating part 5251.

[0054] In other embodiments, the first rotating part 5251 is provided with the first circular arc track at opposite end surfaces of the first avoiding groove 5252. The back surface 5213 of the first rotating part 5251 away from one end of the base 510 is provided with the first circular arc groove. The first circular arc track is rotatably inserted into the first circular arc groove.

[0055] The first rotating part 5215 is rotatably connected with one side of the base 510 through the cooperation of a first rotating rail and a first rotating groove; the first rotating rail is arranged on one of the first rotating part 5215 and the base 510, and the first rotating groove is arranged on the other one of the first rotating part 5215 and the base 510. In this embodiment, the opposite sides of the first rotating part 5215 are respectively provided with first rotating rails 5216, the two first rotating rails 5216 share an axis line, and the opposite ends of one side of the base 510 are respectively provided with first rotating grooves 5101, the two first rotating grooves 5101 share an axis line, and the two first rotating rails 5216 are rotatably arranged in the two first rotating grooves 5101 respectively.

[0056] In other embodiments, the opposite sides of the first rotating part 5215 are respectively provided with first rotating grooves, the two first rotating grooves share an axis line, the opposite ends of one side of the base 510 are respectively provided with first rotating rails, the two first rotating rails share an axis line, and the two first rotating rails are rotatably arranged in the two first rotating grooves respectively.

[0057] The first connecting member 54 is slidably connected between the end of the first connecting member 54 away from the base 510 and the first guide sliding part 5255 through the cooperation of a first sliding rail and a first sliding groove, the first sliding rail is arranged in one of the first connecting member 54 and the first guide sliding part 5255, and the first sliding groove is arranged in the other one of the first connecting member 54 and the first guide sliding part 5255. The first guide sliding part 5255 is provided with a first avoiding space 5256, in the embodiment, the front surface of the first guide sliding part 5255 is provided with the first avoiding space 5256, and the first guide sliding part 5255 is provided with first sliding grooves 5257 on the opposite two inner side surfaces of the first avoiding space 5256, the length direction of the first sliding grooves 5257 is perpendicular to the axis of the first circular arc groove 5250, and the opposite two ends of the first sliding grooves 5257 respectively penetrate through the opposite two side surfaces of the first guide sliding part 5255. The end of the first guide sliding part 5255 away from the first rotating part 5251 is provided with a first rotating groove 5258, the first rotating groove 5258 is a circular arc groove, the axis of the first circular arc groove 5250 is parallel to the axis of the first rotating groove 5258; preferably, the first rotating groove 5258 is coaxial with the first circular arc groove 5250. The first connecting member 54 comprises a first rotating part 541 and a first sliding part 545 connected to the first rotating part 541, the first rotating part 541 is connected to one of the connecting shafts 515, and the first rotating part 541 can rotate relative to the base 510 about the axis of the corresponding connecting shaft 515; the first sliding part 545 is slidably accommodated in the first avoiding space 5256, and the first sliding part 545 is slidably connected between the first connecting member 525 through the cooperation of a first sliding rail and a first sliding groove, the length direction of the first sliding rail is perpendicular to the rotating axis between the first connecting member 54 and the base 510, the first sliding rail is arranged in one of the first sliding part 545 and the first guide sliding part 5255, and the first sliding groove is arranged in the other one of the first sliding part 545 and the first guide sliding part 5255. In the embodiment, the first rotating part 541 is a first rotating cylinder, the first rotating cylinder is provided with a first rotating hole 5410 along the axial direction thereof; the first sliding part 545 is a first sliding plate, one side of the first sliding plate is connected to the outer circumferential surface of the first rotating part 541, the first sliding part 545 is provided with first sliding rails 5450 on the opposite two sides along the axial direction of the first rotating cylinder, the length direction of the first sliding rails 5450 is perpendicular to the axial direction of the first rotating part 541, and the two first sliding rails 5450 are respectively slidably accommodated in the two first sliding grooves 5257 of the first guide sliding part 5255. The first sliding part 545 is provided with a first avoiding groove 5452, the length direction of the first avoiding groove 5452 is perpendicular to the axial direction of the first rotating part 541; specifically, the first avoiding groove 5452 is located at the end of the first sliding part 545 away from the first rotating part 541, one end of the first avoiding groove 5452 penetrates through the end surface of the first sliding part 545 away from the first rotating part 541, and the opposite other end of the first avoiding groove 5452 is close to the first rotating part 541.In other embodiments, the first guide and slide portion 5255 is provided with a first slide rail on each of the opposite sides of the first avoiding space 5256, and the first slide portion 545 is provided with a first slide groove at each of the opposite ends of the first slide portion 545, and the two first slide rails are slidably accommodated in the two first slide grooves. The first slide portion 545 is provided with a first adjusting rod 5453 protruding from one of the inner sides of the first avoiding groove 5452, and the axial direction of the first adjusting rod 5453 is parallel to the axial direction of the first rotating portion 541. The outer circumferential surface of the first rotating portion 541 is provided with a first supporting surface 5412 and a first connecting surface 5414 connected to the first supporting surface 5412, the first connecting surface 5414 is connected to the first supporting surface 5412, and the first connecting surface 5414 is closer to the first slide portion 545 than the first supporting surface 5412; specifically, the outer circumferential surface of the first guide and slide portion 5255 is provided with a first supporting block 5411 close to the first slide portion 545, the first connecting surface 5414 and the first supporting surface 5412 are located on the side of the first supporting block 5411 away from the first rotating portion 541, and the first connecting surface 5414 is inclined relative to the first supporting surface 5412. The opposite end surfaces of the first rotating portion 541 along the axial direction are respectively provided with a first assisting rotating column 5416, and the two first assisting rotating columns 5416 share an axial line, and the axial line of the first assisting rotating column 5416 is parallel to the axial line of the first rotating portion 541.

[0058] The second rotating member 531 is rotatably connected with the second connecting member 535 through a second circular arc track and a second circular arc groove. The second circular arc track is arranged in one of the second rotating member 531 and the second connecting member 535, and the second circular arc groove is arranged in the other one of the second rotating member 531 and the second connecting member 535. In the embodiment, one end of the second connecting member 535 away from one side of the base 510 is provided with the second circular arc groove 5350, and one end of the second rotating member 531 away from the base 510 is provided with the second circular arc track 5310. Specifically, the second connecting member 535 includes the second rotating part 5351 and the second guide sliding part 5355 located at opposite ends thereof. The second front surface 5353 of the second rotating part 5351 is provided with the second avoiding groove 5352. The opposite sides of the second avoiding groove 5352 respectively penetrate the second front surface 5353 and the back surface of the second rotating part 5351. The second rotating part 5351 is respectively provided with the second circular arc grooves 5350 spaced from each other at opposite end surfaces of the second avoiding groove 5352. The opposite ends of the second circular arc groove 5350 close to the base 510 respectively penetrate the second front surface 5353 and the back surface of the second rotating part 5351. The opposite ends of the second circular arc groove 5350 away from the base 510 respectively penetrate the second front surface 5353 and the side surface away from the base 510 of the second rotating part 5351. Optionally, the second front surface 5353 of the second rotating part 5351 is an inclined surface. The second rotating member 531 includes the second adapter part 5311 and the second rotating part 5315 located at opposite ends thereof. The second adapter part 5311 is rotatably connected with the second rotating part 5351. The second rotating member 531 has the second fitting surface 5312 and the second back surface 5313 away from the second fitting surface 5312. The second back surface 5313 is provided with the second circular arc track 5310. Specifically, the second back surface 5313 of the second adapter part 5311 away from one side of the second rotating part 5315 is provided with two second circular arc tracks 5310 spaced from each other. The two second circular arc tracks 5310 are respectively rotatably inserted into the two second circular arc grooves 5350. Optionally, the second back surface 5313 of the second adapter part 5311 is an inclined surface. When the rotating shaft device 50 is in the folded state, the second front surface 5353 of the second connecting member 535 is fitted to the second back surface 5313 of the second adapter part 5311.

[0059] In other embodiments, the second rotating part 5351 is respectively provided with the second circular arc tracks at opposite end surfaces of the second avoiding groove 5352. The second back surface 5313 of the second adapter part 5311 away from one end of the base 510 is provided with the second circular arc groove. The second circular arc track is rotatably inserted into the second circular arc groove.

[0060] The second rotating part 5315 is rotatably connected with one side of the base 510 through the cooperation of a second rotating rail and a second rotating groove; the second rotating rail is arranged on one of the second rotating part 5315 and the base 510, and the second rotating groove is arranged on the other one of the second rotating part 5315 and the base 510. In the embodiment, the opposite two sides of the second rotating part 5315 are respectively provided with second rotating rails 5316, the two second rotating rails 5316 share an axial line, and the opposite two ends of the opposite other side of the base 510 are respectively provided with second rotating grooves 5103, the two second rotating grooves 5103 share an axial line, and the two second rotating rails 5316 are rotatably accommodated in the two second rotating grooves 5103 respectively.

[0061] In other embodiments, the opposite two sides of the second rotating part 5315 are respectively provided with second rotating grooves, the two second rotating grooves share an axial line, the opposite two ends of the opposite other side of the base 510 are respectively provided with second rotating rails, the two second rotating rails share an axial line, and the two second rotating rails are rotatably accommodated in the two second rotating grooves respectively.

[0062] The second connecting rod 55 is slidably connected between the end away from the base 510 and the second guide sliding part 5355 through the cooperation of a first sliding rail and a first sliding groove, the first sliding rail is arranged on one of the second connecting rod 55 and the second guide sliding part 5355, and the first sliding groove is arranged on the other one of the second connecting rod 55 and the second guide sliding part 5355. The second guide sliding part 5355 is provided with a second avoiding space 5356, in the embodiment, the front surface of the second guide sliding part 5355 is provided with the second avoiding space 5356, and the second guide sliding part 5355 is provided with second sliding grooves 5357 on the opposite two inner side surfaces of the second avoiding space 5356, the length direction of the second sliding grooves 5357 is perpendicular to the axis of the second circular arc groove 5350, and the opposite two ends of the second sliding grooves 5357 respectively penetrate through the opposite two side surfaces of the second guide sliding part 5355. The end away from the second rotating part 5351 of the second guide sliding part 5355 is provided with a second rotating groove 5358, the second rotating groove 5358 is a circular arc groove, the axis of the second circular arc groove 5350 is parallel to the axis of the second rotating groove 5358; preferably, the second rotating groove 5358 is coaxial with the second circular arc groove 5350. The second connecting rod 55 comprises a second rotating part 551 and a second sliding part 555 connected to the second rotating part 551, the second rotating part 551 is connected to the other connecting shaft 515, and the second rotating part 551 can rotate relative to the base 510 about the axis of the connecting shaft 515; the second sliding part 555 is slidably accommodated in the second avoiding space 5356, and the second sliding part 555 is slidably connected between the second connecting rod 5355 and the second guide sliding part 5355 through the cooperation of a second sliding rail and a second sliding groove, the length direction of the second sliding rail is perpendicular to the rotating axis between the second connecting rod 55 and the base 510, the second sliding rail is arranged on one of the second sliding part 555 and the second guide sliding part 5355, and the second sliding groove is arranged on the other one of the second sliding part 555 and the second guide sliding part 5355. In the embodiment, the second rotating part 551 is a second rotating cylinder, the second rotating cylinder is provided with a second rotating hole 5510 along the axial direction thereof; the second sliding part 555 is a second sliding plate, one side of the second sliding plate is connected to the outer circumferential surface of the second rotating part 551, the opposite two sides of the second sliding part 555 along the axial direction of the second rotating cylinder are respectively provided with second sliding rails 5550, the length direction of the second sliding rails 5550 is perpendicular to the axial direction of the second rotating part 551, and the two second sliding rails 5550 are respectively slidably accommodated in the two second sliding grooves 5357 of the second guide sliding part 5355. The second sliding part 555 is provided with a second avoiding groove 5552, the length direction of the second avoiding groove 5552 is perpendicular to the axial direction of the second rotating part 551; specifically, the second avoiding groove 5552 is located at the end of the second sliding part 555 away from the second rotating part 551, one end of the second avoiding groove 5552 penetrates through the end surface of the second sliding part 555 away from the second rotating part 551, and the opposite other end of the second avoiding groove 5552 is close to the first rotating part 541.In other embodiments, the second guide sliding portion 5355 is provided with a second sliding rail on each of the opposite sides of the second avoiding space 5356, and the second sliding portion 555 is provided with a second sliding groove at each of the opposite ends thereof, and the two second sliding rails are slidably accommodated in the two second sliding grooves. The second sliding portion 555 is provided with a second adjusting rod 5553 protruding from one of the inner sides of the second avoiding groove 5552, and the axial direction of the second adjusting rod 5553 is parallel to the axial direction of the second rotating portion 551. The outer circumferential surface of the second rotating portion 551 is provided with a second supporting surface 5512 and a second connecting surface 5514 connected to the second supporting surface 5512, and the second connecting surface 5514 is connected to the second supporting surface 5512 and is closer to the second sliding portion 555 than the second supporting surface 5512. Specifically, the outer circumferential surface of the second rotating portion 551 is provided with a second supporting block 5511 close to the second sliding portion 555, the second connecting surface 5514 and the second supporting surface 5512 are located on the side of the second supporting block 5511 away from the second rotating portion 551, and the second connecting surface 5514 is inclined relative to the second supporting surface 5512. The opposite end surfaces of the second rotating portion 551 along the axial direction thereof are respectively provided with a second assisting rotating column 5516, and the two second assisting rotating columns 5516 share an axial center line, and the axial center line of the second assisting rotating column 5516 is parallel to the axial center line of the second rotating portion 551.

[0063] As shown in Figure 12 and Figure 13 The base 510 is a rectangular block, one side of the front surface of the base 510 is provided with a pair of first protrusions 5102, and the opposite side of the front surface of the base 510 is provided with a pair of second protrusions 5104. Two first rotating grooves 5101 are respectively located on the two end surfaces of the pair of first protrusions 5102 facing each other, and two second rotating grooves 5103 are respectively located on the two end surfaces of the pair of second protrusions 5104 facing each other. The front surface of the base 510 is provided with an avoiding space 5105 between the pair of first protrusions 5102 and the pair of second protrusions 5104. One of the end surfaces of the base 510 is provided with a connecting cylinder 5107 on each of the opposite sides thereof, and the axial direction of the connecting cylinder 5107 is parallel to the axial direction of the first rotating groove 5101. The connecting cylinder 5107 is provided with a connecting hole 5108 along the axial direction thereof.

[0064] Please refer to Figures 3-7 and Figures 12-14The assisting mechanism 51 further comprises a first connecting seat 56 and a second connecting seat 57. The first connecting seat 56 is rotatably connected to the first connecting member 525. The first connecting rod 54 is movably connected to the first connecting seat 56 away from the base 510. One side of the side support plate 501 is connected to the front surface of the first connecting seat 56. The second connecting seat 57 is rotatably connected to the second connecting member 535. The second connecting rod 55 is movably connected to the second connecting seat 57 away from the base 510. The other side of the side support plate 501 is connected to the front surface of the second connecting seat 57. The front surface of the first connecting seat 56 is a third fitting surface 560. The front surface of the second connecting seat 57 is a fourth fitting surface 570. The back surface of one side of the side support plate 501 is fitted to the third fitting surface 560. The back surface of the other side of the side support plate 501 is fitted to the fourth fitting surface 570. The first connecting seat 56 and the first connecting member 525 are rotatably connected through the cooperation of a first rotating rail and a first rotating groove. The first rotating rail is arranged in one of the first connecting seat 56 and the first connecting member 525. The first rotating groove is arranged in the other of the first connecting seat 56 and the first connecting member 525. In this embodiment, one end of the first connecting member 525 is provided with a first rotating groove 5258. The first connecting seat 56 is provided with a first rotating rail 561. The first rotating rail 561 is rotatably inserted into the first rotating groove 5258. The second connecting seat 57 and the second connecting member 535 are rotatably connected through the cooperation of a second rotating rail and a second rotating groove. The second rotating rail is arranged in one of the second connecting seat 57 and the second connecting member 535. The second rotating groove is arranged in the other of the second connecting seat 57 and the second connecting member 535. In this embodiment, one end of the second connecting member 535 is provided with a second rotating groove 5358. The second connecting seat 57 is provided with a second rotating rail 571. The second rotating rail 571 is rotatably inserted into the second rotating groove 5358.

[0065] Optionally, the first connecting seat 56 and the first connecting rod 54 are connected through the cooperation of a first adjusting slot and a first adjusting rod, the first adjusting slot is arranged in one of the first connecting seat 56 and the first connecting rod 54, and the first adjusting rod is arranged in the other one of the first connecting seat 56 and the first connecting rod 54. In the embodiment, the first connecting rod 54 is provided with a first adjusting rod 5453, and the first connecting seat 56 is provided with a first adjusting slot 563. The first adjusting slot 563 has a first positioning section 5632 and a second positioning section 5634 at opposite ends thereof, and the first positioning section 5632 is farther away from the base 510 than the second positioning section 5634. The second connecting seat 57 and the second connecting rod 55 are connected through the cooperation of a second adjusting slot and a second adjusting rod, the second adjusting slot is arranged in one of the second connecting seat 57 and the second connecting rod 55, and the second adjusting rod is arranged in the other one of the second connecting seat 57 and the second connecting rod 55. In the embodiment, the second connecting rod 55 is provided with a second adjusting rod 5553, and the second connecting seat 57 is provided with a second adjusting slot 573. The second adjusting slot 573 has a third positioning section 5732 and a fourth positioning section 5734 at opposite ends thereof, and the third positioning section 5732 is farther away from the base 510 than the fourth positioning section 5734. When the pair of side support sheets 501 and the pair of middle support sheets 505 are in the unfolded state, the first adjusting rod 5453 is positioned in the first positioning section 5632, and the second adjusting rod 5553 is positioned in the third positioning section 5732. When the pair of side support sheets 501 and the pair of middle support sheets 505 are in the folded state, the first adjusting rod 5453 is positioned in the second positioning section 5634, and the second adjusting rod 5553 is positioned in the fourth positioning section 5734.

[0066] The first connecting seat 56 comprises a first adapter 562, a first adjusting part 564, and a first connecting part 566 connected to the first adapter 562 and the first adjusting part 564, the first rotating rail 561 is arranged on the first adapter 562, and the first adjusting groove 563 is arranged on the first adjusting part 564; the second connecting seat 57 comprises a second adapter 572, a second adjusting part 574, and a second connecting part 576 connected to the second adapter 572 and the second adjusting part 574, the second rotating rail 571 is arranged on the second adapter 572, and the second adjusting groove 573 is arranged on the second adjusting part 574. Specifically, the first connecting part 566 is a first rectangular plate, the first adapter 562 and the first adjusting part 564 are arranged on opposite ends of one side of the first rectangular plate, and the first adapter 562, the first adjusting part 564, and the first connecting part 566 surround the first sleeve groove 567; the second connecting part 576 is a second rectangular plate, the second adapter 572 and the second adjusting part 574 are arranged on opposite ends of the second rectangular plate, and the second adapter 572, the second adjusting part 574, and the second connecting part 576 surround the second sleeve groove 577. Optionally, the side of the first adjusting part 564 away from the first connecting part 566 is a first arc surface, and the side of the second adjusting part 574 away from the second connecting part 576 is a second arc surface. The first adjusting part 564 is accommodated in the first avoiding groove 5452, so that the first adjusting rod 5453 is slidably accommodated in the first adjusting groove 563; the second adjusting part 574 is accommodated in the second avoiding groove 5552, so that the second adjusting rod 5553 is slidably accommodated in the second adjusting groove 573.

[0067] Please refer to Figures 4-7 、 Figures 12-13 and Figure 15The assisting mechanism 51 further comprises a first connecting frame 546 and a second connecting frame 556. The first connecting frame 546 is rotatably sleeved on one of the connecting shafts 515 and connected to the first rotating part 541. The second connecting frame 556 is rotatably sleeved on the other connecting shaft 515 and connected to the second rotating part 551. One of the middle supporting plates 505 is connected to the first connecting frame 546, and the other middle supporting plate 505 is connected to the second connecting frame 556. When the first connecting rod 54 rotates around the axis of the corresponding connecting shaft 515, the first connecting frame 546 and the corresponding middle supporting plate 505 are driven to rotate together. When the second connecting rod 55 rotates around the axis of the corresponding connecting shaft 515, the second connecting frame 556 and the corresponding middle supporting plate 505 are driven to rotate together. The first connecting frame 546 and the first rotating part 541 are connected through the cooperation of a first assisting groove and a first assisting column. The first assisting groove is arranged on one of the first rotating part 541 and the first connecting frame 546, and the first assisting column is arranged on the other one. In this embodiment, the first connecting frame 546 is provided with the first assisting groove 5460, and the first assisting column 5416 is arranged on the first rotating part 541. The second connecting frame 556 and the second rotating part 551 are connected through the cooperation of a second assisting groove and a second assisting column. The second assisting groove is arranged on one of the second rotating part 551 and the second connecting frame 556, and the second assisting column is arranged on the other one. In this embodiment, the second connecting frame 556 is provided with the second assisting groove 5560, and the second assisting column 5516 is arranged on the second rotating part 551. The first assisting groove 5460 is a first circular arc groove, and the first assisting column 5416 can slide along the first assisting groove 5460. The second assisting groove 5560 is a second circular arc groove, and the second assisting column 5516 can slide along the second assisting groove 5560. Specifically, the first connecting frame 546 comprises a first supporting part 5461 and two first rotating plates 5465 connected to opposite ends of the first supporting part 5461. The two first rotating plates 5465 can be respectively attached to opposite end faces of the first rotating part 541. The first assisting groove 5460 is arranged on the first rotating plate 5465, and the first assisting column 5416 is arranged on the end face of the first rotating part 541. One end of the first rotating plate 5465 away from the first supporting part 5461 is rotatably sleeved on the corresponding connecting shaft 515. The second connecting frame 556 comprises a second supporting part 5561 and second rotating plates 5565 connected to opposite ends of the second supporting part 5561. The two second rotating plates 5565 are respectively attached to opposite end faces of the second rotating part 551. The second assisting groove 5560 is arranged on the second rotating plate 5565, and the second assisting column 5516 is arranged on the end face of the second rotating part 551. One end of the second rotating plate 5565 away from the second supporting part 5561 is rotatably sleeved on the corresponding connecting shaft 515.The first rotating piece 5465 is provided with a first rotating opening 5466 at one end away from the first supporting part 5461, the first rotating opening 5466 is rotatably sleeved on the corresponding connecting shaft 515, and the first auxiliary rotating groove 5460 is located between the first supporting part 5461 and the first rotating opening 5466; the second rotating piece 5565 is provided with a second rotating opening 5566 at one end away from the second supporting part 5561, the second rotating opening 5566 is rotatably sleeved on the corresponding connecting shaft 515, and the second auxiliary rotating groove 5560 is located between the second supporting part 5561 and the second rotating opening 5566. In the embodiment, the first rotating opening 5466 is a semicircular opening, and the two first rotating openings 5466 share an axial line; the second rotating opening 5566 is a semicircular opening, and the two second rotating openings 5566 share an axial line.

[0068] Optionally, the first auxiliary rotating groove 5460 includes a first abutting end 5460a and a second abutting end 5460b at opposite ends thereof, the first abutting end 5460a is farther away from the base 510 than the second abutting end 5460b; the second auxiliary rotating groove 5560 includes a third abutting end 5560a and a fourth abutting end 5560b at opposite ends thereof, the third abutting end 5560a is farther away from the base 510 than the fourth abutting end 5560b. When the pair of side supporting pieces 501 and the pair of middle supporting pieces 505 are in the unfolded state, the first auxiliary rotating column 5416 abuts against the first abutting end 5460a, and the second auxiliary rotating column 5516 abuts against the third abutting end 5560a; when the pair of side supporting pieces 501 and the pair of middle supporting pieces 505 are in the folded state, the first auxiliary rotating column 5416 abuts against the second abutting end 5460b, and the second auxiliary rotating column 5516 abuts against the fourth abutting end 5560b.

[0069] The first supporting part 5461 includes a first supporting strip 5462 and a first connecting strip 5463 connected to one side of the first supporting strip 5462, and the first connecting strip 5463 is inclined relative to the first supporting strip 5462; the second supporting part 5561 includes a second supporting strip 5562 and a second connecting strip 5563 connected to one side of the second supporting strip 5562, and the second connecting strip 5563 is inclined relative to the second supporting strip 5562. Specifically, the first supporting strip 5462 and the first connecting strip 5463 are both rectangular pieces, and the two first rotating pieces 5465 are connected to opposite ends of the rectangular pieces respectively; the second supporting strip 5562 and the second connecting strip 5563 are both rectangular pieces, and the two second rotating pieces 5565 are connected to opposite ends of the rectangular pieces respectively. When the rotating shaft device 50 is in the unfolded state, the front surface of the first supporting strip 5462 is coplanar with the front surface of the second supporting strip 5562.

[0070] As Figures 4-7 and Figures 12-13As shown, the middle support piece 505 comprises a strip-shaped support piece body 506 and a connecting piece body 507 connected to one side of the support piece body 506, wherein the connecting piece body 507 of one middle support piece 505 is connected to the first connecting strip 5463, and the connecting piece body 507 of the other middle support piece 505 is connected to the second connecting strip 5563; when the rotating shaft device 50 is in the unfolded state, the first support strip 5462 and the second support strip 5562 are respectively supported on the corresponding support piece body 506. Optionally, the support piece body 506 is bendable, the bending axis of the support piece body 506 is parallel to the axis of the connecting shaft 515, when the rotating shaft device 50 is in the folded state, the support piece body 506 is in the bent state, the two support pieces 505 enclose an arc-shaped accommodation space, and the support piece body 506 has an elastic restoring force. In some embodiments, the front surface of the middle support piece 505 is provided with a plurality of through holes to facilitate the bending or restoring of the middle support piece 505; specifically, the front surface of the support piece body 506 is provided with a plurality of through holes. The front surface of the back cover 509 is provided with a fixing groove 5091 for fixing the base 510. In some embodiments, the front surface of the side support piece 501 can also be provided with a plurality of through holes to improve the rigid rebound distribution of the side support piece 501 on the basis of having sufficient supporting force.

[0071] In this embodiment, the rotating shaft device 50 comprises three assisting mechanisms 51, a pair of side support pieces 501 and two pairs of middle support pieces 505, the three assisting mechanisms 51 are arranged along the direction parallel to the folding axis of the rotating shaft device 50; the back surface of one side support piece 501 is connected to the first fitting surface 5212 of the three first rotating members 521 and the third fitting surface 560 of the three first connecting seats 56 on one side of the rotating shaft device 50, and the back surface of the other side support piece 501 is connected to the second fitting surface 5312 of the three second rotating members 531 and the fourth fitting surface 570 of the three second connecting seats 57 on the opposite side of the rotating shaft device 50; one of the two pairs of middle support pieces 505 is connected to the two first connecting rod members 54 on the same side of the two adjacent assisting mechanisms 51, and the other is connected to the two second connecting rod members 55 on the opposite side of the two assisting mechanisms 51; one of the other pair of middle support pieces 505 is connected to the first connecting rod member 54 on one side of the other assisting mechanism 51, and the other is connected to the second connecting rod member 55 on the opposite side of the other assisting mechanism 51.

[0072] In other embodiments, the rotating shaft device 50 comprises two rotating assisting mechanisms 51, a pair of side supporting plates 501 and a pair of middle supporting plates 505, the two rotating assisting mechanisms 51 are located at opposite ends of the rotating shaft device 50, the back of one side supporting plate 501 is connected to the first fitting surface 5212 of the two first rotating members 521 and the third fitting surface 560 of the two first connecting seats 56 at one side of the rotating shaft device 50, the back of the other side supporting plate 501 is connected to the second fitting surface 5312 of the two second rotating members 531 and the fourth fitting surface 570 of the two second connecting seats 57 at the opposite side of the rotating shaft device 50; one middle supporting plate 505 is connected to the two first connecting rods 54 at one side of the rotating shaft device 50, and the other middle supporting plate 505 is connected to the two second connecting rods 55 at the opposite side of the rotating shaft device 50.

[0073] For your reference, please also see Figures 8-13, when assembling the assisting rotating mechanism 51, the first connecting frame 546 is installed to the first rotating part 541, the first connecting strip 5463 is opposite to the first connecting surface 5414, the first supporting strip 5462 is opposite to the first supporting surface 5412, and the two first assisting rotating columns 5416 are respectively inserted into the two first assisting rotating grooves 5460; the second connecting frame 556 is installed to the second rotating part 551, the second connecting strip 5563 is opposite to the second connecting surface 5514, and the second supporting strip 5562 is opposite to the second supporting surface 5512. The two connecting shafts 515 are respectively inserted into the first rotating hole 5410 of the first rotating part 541 and the second rotating hole 5510 of the second rotating part 551, and the same side ends of the two connecting shafts 515 are respectively inserted into the two connecting holes 5108 of the base 510, so that the two connecting shafts 515 are respectively rotatably accommodated in the first rotating port 5466 and the second rotating port 5566; the first circular arc rail 5210 of the first rotating part 521 is rotatably inserted into the first circular arc groove 5250 of the first connecting part 525, the second circular arc rail 5310 of the second rotating part 531 is rotatably inserted into the second circular arc groove 5350 of the first connecting part 535, the first rotating rail 5216 of the first rotating part 521 is rotatably inserted into the first rotating groove 5101 of the base 510, and the second rotating rail 5316 of the second rotating part 531 is rotatably inserted into the second rotating groove 5103 of the base 510; the two first sliding rails 5450 of the first sliding part 545 are respectively slidably inserted into the two first sliding grooves 5257 of the first connecting part 525, and the two second sliding rails 5550 of the second sliding part 555 are respectively slidably inserted into the two second sliding grooves 5357 of the second connecting part 535; the first rotating rail 561 of the first connecting seat 56 is rotatably inserted into the first rotating groove 5258 of the first connecting part 525, the first adjusting part 564 is rollingly accommodated in the first avoiding groove 5452, and the first adjusting rod 5453 is slidably inserted into the first adjusting groove 563; the second rotating rail 571 of the second connecting seat 57 is rotatably inserted into the second rotating groove 5358 of the second connecting part 535, the second adjusting part 574 is rollingly accommodated in the second avoiding groove 5552, and the second adjusting rod 5553 is slidably inserted into the second adjusting groove 573.At this time, the first auxiliary rotating groove 5460 is coaxial with the corresponding connecting shaft 515, the first rotating part 541 can rotate relative to the first connecting frame 546 around the axis of the corresponding connecting shaft 515, the first auxiliary rotating column 5416 can slide along the first auxiliary rotating groove 5460, when the first auxiliary rotating column 5416 pushes against the end of the first auxiliary rotating groove 5460, the first connecting frame 546 and the first rotating part 541 rotate around the axis of the corresponding connecting shaft 515 together; the second auxiliary rotating groove 5560 is coaxial with the corresponding connecting shaft 515, the second rotating part 551 can rotate relative to the second connecting frame 556 around the axis of the corresponding connecting shaft 515, the second auxiliary rotating column 5516 can slide along the second auxiliary rotating groove 5560, when the second auxiliary rotating column 5516 pushes against the end of the second auxiliary rotating groove 5560, the second connecting frame 556 and the second rotating part 551 rotate around the axis of the corresponding connecting shaft 515 together.

[0074] When assembling the rotating shaft device 50, the three installed base 510 of the assisting rotating mechanism 51 are fixedly connected to the fixing groove 5091 of the back cover 509 at intervals, specifically, two assisting rotating mechanisms 51 are respectively located at opposite ends of the back cover 509, and the other assisting rotating mechanism 51 is located at the middle of the back cover 509; the connecting piece body 507 of two middle supporting sheets 505 are respectively connected to the corresponding first connecting strip 5463 on one side of the back cover 509, so that the supporting piece body 506 of the middle supporting sheet 505 faces the first supporting strip 5462; the connecting piece body 507 of the other two middle supporting sheets 505 are respectively connected to the corresponding second connecting strip 5563 on the opposite side of the back cover 509, so that the supporting piece body 506 of the middle supporting sheet 505 faces the second supporting strip 5562. The back surface of one side supporting sheet 501 is connected to the first lamination surface 5212 of the first rotating piece 521 and the third lamination surface 560 of the first connecting seat 56 on one side of the back cover 509, and the back surface of the other side supporting sheet 501 is connected to the second lamination surface 5312 of the second rotating piece 531 and the fourth lamination surface 570 of the second connecting seat 57 on the opposite side of the back cover 509. When the rotating shaft device 50 is in the flat state, the first supporting surface 5412 is supported on the first supporting strip 5462, the first assisting rotating column 5416 is positioned at the first abutting end 5460a, the second supporting surface 5512 is supported on the second supporting strip 5562, the second assisting rotating column 5516 is positioned at the third abutting end 5560a, and the front surfaces of the supporting piece bodies 506 of the middle supporting sheets 505 are coplanar; the first rotating mechanism 52 and the second rotating mechanism 53 are in the flat state, the first connecting rod 54 and the second connecting rod 55 are in the flat state, the first adjusting rod 5453 is positioned at the first positioning section 5632 of the first connecting seat 56, the second adjusting rod 5553 is positioned at the third positioning section 5732 of the second connecting seat 57, and the front surfaces of the two side supporting sheets 501 are coplanar. When the rotating shaft device 50 is in the folded state, the first supporting surface 5412 is separated from the first supporting strip 5462, the first assisting rotating column 5416 is positioned at the second abutting end 5460b, the second supporting surface 5512 is separated from the second supporting strip 5562, the second assisting rotating column 5516 is positioned at the fourth abutting end 5560b, and the front surfaces of the supporting piece bodies 506 of the middle supporting sheets 505 and the front surface of the base 501 form a water drop-shaped space; the first rotating mechanism 52 and the second rotating mechanism 53 are in the folded state, the first connecting rod 54 and the second connecting rod 55 are in the folded state, the first adjusting rod 5453 is positioned at the second positioning section 5634 of the first connecting seat 56, the second adjusting rod 5553 is positioned at the fourth positioning section 5734 of the second connecting seat 57, and the front surfaces of the two side supporting sheets 501 are close and parallel.

[0075] Please see Figures 4-9 and Figures 16-30When the shaft device 50 is folded from the unfolded state to the folded state, the first rotating mechanism 52 rotates along the corresponding second rotating axis L2 relative to the base 510 to the second rotating mechanism 53, the two first rotating rails 5216 of the first rotating member 521 rotate in the two first rotating grooves 5101 of the base 510 respectively, the first circular arc rail 5210 of the first rotating member 521 rotates in the first circular arc groove 5250 of the first connecting member 525, and the first rotating member 521 rotates along the corresponding first rotating axis L1 relative to the first connecting member 525; the first connecting member 525 drives the first connecting link 54 to rotate along the corresponding third rotating axis L3 relative to the base 510 to the second connecting link 55, the two first sliding rails 5450 of the first connecting link 54 slide in the two first sliding grooves 5257 of the first connecting member 525 respectively, at the same time, the first rotating rail 561 of the first connecting seat 56 rotates in the first rotating groove 5258, the first adjusting rod 5453 rolls in the first adjusting groove 563 from the first positioning section 5632 to the second positioning section 5634, the first rotating part 541 rotates around the axis of the corresponding connecting shaft 515 relative to the first connecting frame 546, the first auxiliary rotating column 5416 slides in the first auxiliary rotating groove 5460 from the first abutting end 5460a to the second abutting end 5460b, the first auxiliary rotating column 5416 abuts against the second abutting end 5460b, so that the first rotating part 541, the first connecting frame 546 and the corresponding middle support sheet 505 rotate to the second connecting link 55 together, and one side support sheet 501 rotates relative to the base 510 with the first rotating member 521 and the first connecting seat 56.The second rotating mechanism 53 rotates relative to the base 510 along the corresponding second rotating axis L2 toward the first rotating mechanism 52, the two second rotating rails 5316 of the second rotating member 531 rotate in the two second rotating grooves 5103 of the base 510 respectively, the second circular arc rail 5310 of the second rotating member 531 rotates in the second circular arc groove 5350 of the second connecting member 535, and the second rotating member 531 rotates relative to the second connecting member 535 along the corresponding first rotating axis L1; the second connecting member 535 drives the second connecting link 55 to rotate relative to the first connecting link 54 along the corresponding third rotating axis L3, the two second sliding rails 5550 of the second connecting link 55 slide in the two second sliding grooves 5357 of the second connecting member 535 respectively, at the same time, the second rotating rail 571 of the second connecting seat 57 rotates in the second rotating groove 5358, the second adjusting rod 5553 rolls in the second adjusting groove 573 from the third positioning section 5732 to the fourth positioning section 5734, the second rotating part 551 rotates relative to the second connecting frame 556 around the axis of the corresponding connecting shaft 515, the second rotating column 5516 slides in the second rotating groove 5560 from the third abutting end 5560a to the fourth abutting end 5560b, the second rotating column 5516 abuts against the fourth abutting end 5560b, so that the second rotating part 551, the second connecting frame 556 and the corresponding middle support sheet 505 rotate together toward the first connecting link 54, and the other side support sheet 501 rotates relative to the base 510 with the second rotating member 531 and the second connecting seat 57. The front faces of the two side support sheets 501, the front face of the middle support sheet 505 and the front face of the base 501 form a water-drop-shaped space. One of the middle support sheets 505 is connected to the first rotating part 541 through the first connecting frame 546, and the first connecting frame 546 and the first rotating part 541 are connected through the cooperation of the first rotating groove 5460 and the first rotating column 5416, so that the first rotating column 5416 slides in the first rotating groove 5460 to the second positioning section 5634, and then drives the first connecting frame 546 and the middle support sheet 505 fixed on the first connecting frame 546 to rotate together; the other middle support sheet 505 is connected to the second rotating part 551 through the second connecting frame 556, and the second connecting frame 556 and the second rotating part 551 are connected through the cooperation of the second rotating shaft 5560 and the second rotating column 5516, so that the second rotating column 5516 slides in the second rotating groove 5560 to the fourth positioning section 5734, and then drives the second connecting frame 556 and the middle support sheet 505 fixed on the second connecting frame 556 to rotate together; that is, the rotation angle of the middle support sheet 505 can be adjusted by using intermittent motion, so as to avoid excessive bending of the middle support sheet 505 caused by 90-degree rotation of the middle support sheet 505.

[0076] When the rotating shaft device 50 is unfolded from the folded state to the flat state, the first rotating mechanism 52 rotates away from the second rotating mechanism 53 along the corresponding second rotating axis L2 relative to the base 510, the two first rotating rails 5216 of the first rotating piece 521 rotate in the two first rotating grooves 5101 of the base 510 respectively, the first circular arc rail 5210 of the first rotating piece 521 rotates in the first circular arc groove 5250 of the first connecting piece 525, and the first rotating piece 521 rotates relative to the first connecting piece 525 along the corresponding first rotating axis L1; the first connecting piece 525 drives the first connecting link 54 to rotate away from the second connecting link 55 along the corresponding third rotating axis L3 relative to the base 510, the two first sliding rails 5450 of the first connecting link 54 slide in the two first sliding grooves 5257 of the first connecting piece 525 respectively, at the same time, the first rotating rail 561 of the first connecting seat 56 rotates in the first rotating groove 5258, the first adjusting rod 5453 rolls in the first adjusting groove 563 from the second positioning section 5634 to the first positioning section 5632, the first rotating part 541 rotates relative to the first connecting frame 546 around the axis of the corresponding connecting shaft 515, makes the first auxiliary rotating column 5416 slide in the first auxiliary rotating groove 5460 from the second abutting end 5460b to the first abutting end 5460a, and the first auxiliary rotating column 5416 abuts against the first abutting end 5460a, so that the first rotating part 541, the first connecting frame 546 and the corresponding middle support sheet 505 rotate away from the second connecting link 55 together, and at the same time, one side support sheet 501 unfolds relative to the base 510 with the first rotating piece 521 and the first connecting seat 56.The second rotating mechanism 53 is unfolded by rotating away from the first rotating mechanism 52 along the corresponding second rotating axis L2 relative to the base 510, the two second rotating rails 5316 of the second rotating member 531 rotate in the two second rotating grooves 5103 of the base 510 respectively, the second circular arc rail 5310 of the second rotating member 531 rotates in the second circular arc groove 5350 of the second connecting member 535, and the second rotating member 531 rotates away from the first rotating member 521 along the corresponding first rotating axis L1 relative to the second connecting member 535; the second connecting member 535 drives the second connecting link 55 to rotate away from the first connecting link 54 along the corresponding third rotating axis L3 relative to the base 510, the two second sliding rails 5550 of the second connecting link 55 slide in the two second sliding grooves 5357 of the second connecting member 535 respectively, at the same time, the second rotating rail 571 of the second connecting seat 57 rotates in the second rotating groove 5358, the second adjusting rod 5553 rolls in the second adjusting groove 573 from the fourth positioning section 5734 to the third positioning section 5732, the second rotating part 551 rotates around the axis of the corresponding connecting shaft 515 relative to the second connecting frame 556, makes the second auxiliary rotating column 5516 slide in the second auxiliary rotating groove 5560 from the fourth abutting end 5560b to the third abutting end 5560a, and the second auxiliary rotating column 5516 abuts against the third abutting end 5560a, so that the second rotating part 551, the second connecting frame 556 and the corresponding middle support sheet 505 rotate away from the first connecting link 54 together, at the same time, the other side support sheet 501 rotates relative to the base 510 with the second rotating member 531 and the second connecting seat 57. Until the two side support sheets 501 and the middle support sheet 505 are unfolded to be in a horizontal state.

[0077] Please see Figures 1-3The installed rotating shaft device 50 is arranged between the two frame bodies 40, and the opposite sides of the rotating shaft device 50 are fixedly connected with the two frame bodies 40 respectively. Specifically, the first rotating mechanism 52 on one side of the base 510 is arranged in the installation slot 406 of one frame body 40, and the first connecting member 525 of the first rotating mechanism 52 is connected with the frame body 40; the second rotating mechanism 53 on the opposite side of the base 510 is arranged in the installation slot 406 of the other frame body 40, and the second connecting member 535 of the second rotating mechanism 53 is connected with the frame body 40. At this time, the front surface 402 of the two frame bodies 40, the front surface of the side support piece 501 and the front surface of the middle support piece 505 are coplanar. The back surface of the flexible screen 30 is connected with the front surface 402 of the two frame bodies 40 and the front surface of the rotating shaft device 50; specifically, the bendable area 31 is connected with the front surface of the side support piece 501 and the front surface of the middle support piece 505 of the rotating shaft device 50, and the two non-bendable areas 33 are connected with the front surface 402 of the two frame bodies 40 respectively. Since the ultra-thin side support piece 501 and the middle support piece 505 are used to replace the support mechanism and the support piece in the prior art, the overall thickness of the rotating shaft device 50 is reduced, the overall thickness of the electronic device 100 is reduced, and the thin development of the electronic device 100 is facilitated.

[0078] Please refer to Figures 1-5 and Figures 16-30 When the electronic device 100 is bent, a bending force is applied to at least one of the two frame bodies 40 of the electronic device 100, so that the first connecting member 525 and the second connecting member 535 connected with the two frame bodies 40 drive the first rotating member 521 and the second rotating member 256 to rotate synchronously relative to the base 510 in the direction of approaching each other. One side support piece 501 rotates towards the other side support piece 501 with the first rotating member 521 and the first connecting seat 56, and the rotation of the first connecting rod member 54 drives the corresponding middle support piece 505 to rotate; the other side support piece 501 rotates towards the first rotating member 521 with the second rotating member 531 and the second connecting seat 57, and the rotation of the second connecting rod member 55 drives the corresponding middle support piece 505 to rotate, until the two side support pieces 501 and the middle support pieces 505 form a water drop-shaped space, so as to realize the folding of the rotating shaft device 50, and the bendable area 31 of the flexible screen 30 is bent with the rotating shaft device 50, until the bendable area 31 is bent into a water drop shape, so that the support piece body 506 of the middle support piece 505 is curved and supports the bendable area 31, thereby realizing the folding of the electronic device 100. In the process of bending the electronic device 100, the middle support piece 505 changes from a flat state to a curved state, so that the middle support piece 505 has a rebounding force.

[0079] When unfolding the electronic device 100, an unfolding force is applied to at least one of the two frame bodies 40 of the electronic device 100, so that the first connecting member 525 and the second connecting member 535 connected to the two frame bodies 40 drive the first rotating member 521 and the second rotating member 256 to rotate reversely relative to the base 510 and rotate in a direction away from each other, and one side of the side support sheet 501 away from the middle support sheet 505 rotates relative to the first connecting member 525, one side of the side support sheet 501 away from the other side of the side support sheet 501 rotates with the first rotating member 521 and the first connecting seat 56, and the rotation of the first connecting rod 54 drives the corresponding middle support sheet 505 to rotate; the other side of the side support sheet 501 away from the first rotating member 521 rotates with the second rotating member 531 and the second connecting seat 57, and the rotation of the second connecting rod 55 drives the corresponding middle support sheet 505 to rotate, until the two side support sheets 501 and the middle support sheet 505 are unfolded, so as to realize the unfolding of the rotating shaft device 50, and the bendable area 31 of the flexible screen 30 is unfolded with the rotating shaft device 50 until the flexible screen 30 is completely unfolded, and the middle support sheet 505 and the side support sheet 501 support the bendable area 31, so as to realize the unfolding of the electronic device 100. During the unfolding of the electronic device 100, the middle support sheet 505 changes from a curved state to an unfolded state, and therefore the middle support sheet 505 has a rebounding force, which is more helpful for the unfolding of the electronic device 100.

[0080] The middle support sheet 505 of the rotating shaft device 50 of the electronic device 100 is directly connected to the first connecting surface 5414 of the first connecting rod 54 and the second connecting surface 5514 of the second connecting rod 55, the middle support sheet 505 on the first connecting rod 54 can rotate with the first connecting rod 54, and the middle support sheet 505 on the second connecting rod 55 can rotate with the second connecting rod 55, one side of the side support sheet 501 is directly connected to the first rotating member 521 and the first connecting seat 56, and the side support sheet 501 can rotate with the first rotating member 521, and the other side of the side support sheet 501 is directly connected to the second rotating member 531 and the second connecting seat 57, so as to drive the bendable area 31 of the flexible screen 30 to bend or unfold; because the thickness of the middle support sheet 505 and the side support sheet 501 is thin, the overall thickness of the rotating shaft device 50 is reduced, the overall thickness of the electronic device 100 is reduced, and the development requirement of thinning of the electronic device 100 is met; in addition, the structure of the side support sheet 501 and the middle support sheet 505 is simple, and the connection relationship between the side support sheet 501, the middle support sheet 505 and the rotating assisting mechanism 51 is simple, so as to be helpful for manufacturing and assembly time, reduce cost, and improve manufacturing efficiency.

[0081] The above is the implementation of the embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the embodiment of the present application, a number of improvements and refinements can be made, which are also considered as the protection scope of the present application.

Claims

1. A rotating shaft device characterized by comprising: The rotating shaft device comprises: a base; a first rotating mechanism comprising a first rotating member and a first connecting member, the first rotating member being rotatably connected to the first connecting member, one end of the first rotating member away from the first connecting member being rotatably connected to one side of the base; a second rotating mechanism comprising a second rotating member and a second connecting member, the second rotating member being rotatably connected to the second connecting member, one end of the second rotating member away from the second connecting member being rotatably connected to the other side of the base; a first connecting rod, one side of the first connecting rod being rotatably connected to one side of the base, the other side of the first connecting rod away from the base being slidably connected to the first connecting member; a second connecting rod, one side of the second connecting rod being rotatably connected to one side of the base, the other side of the second connecting rod away from the base being slidably connected to the second connecting member; a pair of middle supporting plates, one of the middle supporting plates being connected to one side of the first connecting rod close to the base and being rotatable with the first connecting rod relative to the base, the other middle supporting plate being connected to one side of the second connecting rod close to the base and being rotatable with the second connecting rod relative to the base, the middle supporting plate comprising a strip-shaped supporting plate body and a connecting plate body connected to one side of the supporting plate body, the supporting plate body being bendable; and a pair of side supporting plates, one of the side supporting plates being connected to the front of the first rotating member and being rotatable with the first rotating member relative to the base, the other side supporting plate being connected to the front of the second rotating member and being rotatable with the second rotating member relative to the base; when the rotating shaft device is in a folded state, the supporting plate body is in a bent state, the two supporting plates and the pair of side supporting plates form an arc-shaped receiving space, and the supporting plate body has an elastic restoring force.

2. The rotational shaft device according to claim 1, characterized by The first connecting seat is rotatably connected to the first connecting member, the other side of the first connecting rod away from the base is movably connected to the first connecting seat, and one of the side supporting plates is connected to the front of the first connecting seat; the second connecting seat is rotatably connected to the second connecting member, the other side of the second connecting rod away from the base is movably connected to the second connecting seat, and the other side supporting plate is connected to the front of the second connecting seat.

3. The rotational shaft device according to claim 2, characterized by The first rotating member and the first connecting member are rotatably connected through the cooperation of a first arc rail and a first arc groove, the first connecting seat and the first connecting member are rotatably connected through the cooperation of a first rotating rail and a first rotating groove, and the axis of the first arc groove is parallel to the axis of the first rotating groove; the second rotating member and the second connecting member are rotatably connected through the cooperation of a second arc rail and a second arc groove, the second connecting seat and the second connecting member are rotatably connected through the cooperation of a second rotating rail and a second rotating groove, and the axis of the second arc groove is parallel to the axis of the second rotating groove.

4. The rotational shaft device according to claim 3, characterized by The first connecting seat and the first connecting rod are connected through the cooperation of a first adjusting groove and a first adjusting rod, the first adjusting groove has a first positioning section and a second positioning section at opposite ends thereof, the first positioning section is farther away from the base than the second positioning section; the second connecting seat and the second connecting rod are connected through the cooperation of a second adjusting groove and a second adjusting rod, the second adjusting groove has a third positioning section and a fourth positioning section at opposite ends thereof, the third positioning section is farther away from the base than the fourth positioning section; when a pair of the side support pieces and a pair of the middle support pieces are in a flat state, the first adjusting rod is positioned in the first positioning section, and the second adjusting rod is positioned in the third positioning section; when a pair of the side support pieces and a pair of the middle support pieces are in a folded state, the first adjusting rod is positioned in the second positioning section, and the second adjusting rod is positioned in the fourth positioning section.

5. The rotational shaft device according to claim 4, characterized by The first connecting seat comprises a first adapter, a first adjusting part and a first connecting part connected to the first adapter and the first adjusting part, the first rotating rail is arranged on the first adapter, the first rotating groove is arranged on the first connecting piece, the first adjusting groove is arranged on the first adjusting part, and the first adjusting rod is arranged on the first connecting rod; the second connecting seat comprises a second adapter, a second adjusting part and a second connecting part connected to the second adapter and the second adjusting part, the second rotating rail is arranged on the second adapter, the second rotating groove is arranged on the second connecting piece, the second adjusting groove is arranged on the second adjusting part, and the second adjusting rod is arranged on the second connecting rod.

6. The rotational shaft device according to claim 5, wherein The first connecting rod comprises a first sliding part, the first sliding part and the first connecting piece are connected through the cooperation of a first sliding rail and a first sliding groove, the length direction of the first sliding rail is perpendicular to the rotating axis between the first connecting rod and the base, the first sliding part is provided with a first avoiding groove, and the first adjusting part is rollably accommodated in the first avoiding groove; the second connecting rod comprises a second sliding part, the second sliding part and the second connecting piece are connected through the cooperation of a second sliding rail and a second sliding groove, the length direction of the second sliding rail is perpendicular to the rotating axis between the second connecting rod and the base, the second sliding part is provided with a second avoiding groove, and the second adjusting part is rollably accommodated in the second avoiding groove.

7. The rotational coupling device of claim 1, wherein A pair of connecting shafts, a first connecting frame and a second connecting frame are further included, a pair of the connecting shafts are respectively connected to opposite sides of the base, the first connecting rod comprises a first rotating part, the first rotating part is connected to one of the connecting shafts, the second connecting rod comprises a second rotating part, the second rotating part is connected to the other connecting shaft, the first connecting frame is rotatably sleeved on one of the connecting shafts, and the first connecting frame is connected to the first rotating part, the second connecting frame is rotatably sleeved on the other connecting shaft, and the second connecting frame is connected to the second rotating part.

8. The rotational coupling device of claim 7, wherein, One of the middle support pieces is connected to the first connecting frame, and the other middle support piece is connected to the second connecting frame. The first connecting rod can rotate around the axis of the corresponding connecting shaft to drive the first connecting frame and the corresponding middle support piece to rotate. The second connecting rod can rotate around the axis of the corresponding connecting shaft to drive the second connecting frame and the corresponding middle support piece to rotate.

9. The rotational coupling device of claim 7, wherein, The first connecting frame and the first rotating part are connected through the cooperation of the first auxiliary rotating groove and the first auxiliary rotating column. The first auxiliary rotating groove is a first circular arc groove and shares the same axis with the corresponding connecting shaft. The first auxiliary rotating column can slide along the first auxiliary rotating groove. The second connecting frame and the second rotating part are connected through the cooperation of the second auxiliary rotating groove and the second auxiliary rotating column. The second auxiliary rotating groove is a second circular arc groove and shares the same axis with the corresponding connecting shaft. The second auxiliary rotating column can slide along the second auxiliary rotating groove.

10. The rotational coupling device of claim 9, wherein, The first auxiliary rotating groove includes a first abutting end and a second abutting end at opposite ends. The first abutting end is farther away from the base than the second abutting end. The second auxiliary rotating groove includes a third abutting end and a fourth abutting end at opposite ends. The third abutting end is farther away from the base than the fourth abutting end. When a pair of the side support pieces and the middle support pieces are in an unfolded state, the first auxiliary rotating column abuts against the first abutting end, and the second auxiliary rotating column abuts against the third abutting end. When the pair of the side support pieces and the middle support pieces are in a folded state, the first auxiliary rotating column abuts against the second abutting end, and the second auxiliary rotating column abuts against the fourth abutting end.

11. The rotational coupling device of claim 10, wherein, When the rotating shaft device is folded from the unfolded state to the folded state, the first rotating part rotates around the axis of the corresponding connecting shaft relative to the first connecting frame, causing the first auxiliary rotating column to slide in the first auxiliary rotating groove from the first abutting end to the second abutting end. The first auxiliary rotating column abuts against the second abutting end to drive the first rotating part, the first connecting frame, and the corresponding middle support piece to rotate. The second rotating part rotates around the axis of the corresponding connecting shaft relative to the second connecting frame, causing the second auxiliary rotating column to slide in the second auxiliary rotating groove from the third abutting end to the fourth abutting end. The second auxiliary rotating column abuts against the fourth abutting end to drive the second rotating part, the second connecting frame, and the corresponding middle support piece to rotate.

12. The rotational coupling device of claim 9, wherein, The first connecting frame comprises a first support part and two first rotating pieces connected to opposite ends of the first support part, the two first rotating pieces are respectively attached to opposite end faces of the first rotating part, the first rotating groove is arranged on the first rotating piece, the first rotating column is arranged on the end face of the first rotating part, and one end of the first rotating piece away from the first support part is rotatably sleeved on the corresponding connecting shaft; the second connecting frame comprises a second support part and two second rotating pieces connected to opposite ends of the second support part, the two second rotating pieces are respectively attached to opposite end faces of the second rotating part, the second rotating groove is arranged on the second rotating piece, the second rotating column is arranged on the end face of the second rotating part, and one end of the second rotating piece away from the second support part is rotatably sleeved on the corresponding connecting shaft.

13. The rotational coupling device of claim 12, wherein, One end of the first rotating piece away from the first support part is provided with a first rotating port, the first rotating port is rotatably sleeved on the corresponding connecting shaft, and the first rotating groove is located between the first support part and the first rotating port; one end of the second rotating piece away from the second support part is provided with a second rotating port, the second rotating port is rotatably sleeved on the corresponding connecting shaft, and the second rotating groove is located between the second support part and the second rotating port.

14. The rotational coupling device of claim 12, wherein, The first support part comprises a first support strip and a first connecting strip connected to one side of the first support strip, the first connecting strip is inclined relative to the first support strip; the second support part comprises a second support strip and a second connecting strip connected to one side of the second support strip, the second connecting strip is inclined relative to the second support strip; the connecting piece body of one of the middle support pieces is connected to the first connecting strip, and the connecting piece body of the other middle support piece is connected to the second connecting strip; when the rotating shaft device is in the unfolded state, the first support strip and the second support strip are respectively supported on the corresponding support piece body.

15. The rotational coupling device of claim 14, wherein, The outer circumferential surface of the first rotating part is provided with a first support surface, and the outer circumferential surface of the second rotating part is provided with a second support surface; when the rotating shaft device is in the unfolded state, the first support surface supports the first connecting strip, and the second support surface supports the second connecting strip.

16. The rotational coupling device of claim 7, wherein, The bending axis of the support piece body is parallel to the axis of the connecting shaft.

17. A foldable housing characterized by, The folding shell comprises the rotating shaft device and two frame bodies, and opposite sides of the rotating shaft device are respectively connected to the two frame bodies.

18. An electronic device, comprising: The electronic device comprises a flexible screen, two frame bodies and the rotating shaft device, opposite sides of the rotating shaft device are respectively connected to the two frame bodies, and the flexible screen is connected to the two frame bodies and the rotating shaft device.

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