Folding hinge mechanism for preventing screen from arching

Abstract

The invention relates to the technical field of folding hinges, in particular to a folding hinge mechanism for preventing a screen from arching, which comprises a middle plate module, a torsion module, a door plate and a middle frame. The two middle frames are bonded to the two ends of the screen respectively to form a first constraint point A for the screen, the connecting pieces rotate relative to the middle plate module and drive the torsion module, the door plate and the middle frames to be linked so as to fold the screen, and the two connecting pieces slide through the first guide sliding parts and the first guide grooves of the door plate respectively; the folding center point G of the screen abuts against the middle plate module, the damping arms slide through second guide sliding parts and second guide grooves of the door plates, the two door plates are bonded with the screen to form a second constraint point D1 for the screen, the middle frame rotates along the connecting piece and moves through third guide sliding parts and third guide grooves of the door plates, the two door plates rotate, and the screen is folded. The second constraint point D1 moves upwards by a distance H towards the direction of the middle frame to form a third constraint point D2, so that the screen between the first constraint point A and the third constraint point D2 is kept in a straight state.

Description

Technical Field

[0001] The present invention relates to the technical field of folding hinges, and in particular to a folding hinge mechanism for preventing a screen from arching. Background Art

[0002] The folding hinge of a mobile phone is a crucial component of a foldable screen mobile phone, which realizes the function of folding and unfolding the screen.

[0003] The folding hinges of some mobile phones are more laborious when the screen is folded or unfolded, and the screen is difficult to fold straight when folded, and the screen part has obvious arches and unevenness. The arched and uneven screen will affect the life of the screen and the user experience after long-term use, so it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a folding hinge mechanism for preventing a screen from arching. The two middle frames are respectively bonded to the two ends of the screen to form a first constraint point A for the screen, and the two door panels are respectively bonded to the screen to form a second constraint point D1 for the screen. The connecting member is rotated relative to the middle plate module and drives the torque module, the door panel and the middle frame to work in conjunction to fold the screen. The two connecting members slide through the first guide slide portion and the first guide groove of the door panel respectively, the middle frame rotates along the connecting member and moves through the third guide slide portion and the third guide groove of the door panel. The two door panels rotate, and the second constraint point D1 moves up a distance H toward the middle frame to form a third constraint point D2, so that the screen between the first constraint point A and the third constraint point D2 remains in a straight state, thereby achieving the purpose of preventing the screen from arching, effectively extending the service life of the screen and improving the user experience.

[0005] To achieve the above object, the present invention provides a folding hinge mechanism for preventing the screen from arching, comprising a middle plate module, a torsion module, a door panel and a middle frame.

[0006] The middle plate module is rotatably provided with a connecting piece, the connecting piece is hinged to the middle frame, the connecting piece is provided with a first guide slide portion, and the door panel is provided with a first guide groove matched with the first guide slide portion;

[0007] The torsion module is fixed to the middle plate module, the torsion module is rotatably provided with a damping arm, the damping arm is slidably connected with the door panel, the damping arm is provided with a second guide slide portion, and the door panel is provided with a second guide groove matched with the second guide slide portion;

[0008] The door panel is slidably connected to the middle frame, the door panel is provided with a third guide groove, and the middle frame is provided with a third guide sliding portion matched with the third guide groove;

[0009] The number of the middle frame, the door panel, the connecting member and the damping arm are all two and they are arranged relative to the middle panel module;

[0010] The two middle frames are respectively bonded to the two ends of the screen to form a first constraint point A for the screen, the connecting member rotates relative to the middle plate module to approach each other and drive the torsion module, the door panel and the middle frame to link to fold the screen, the two connecting members slide through the first guide slide portion and the first guide groove of the door panel respectively, the first guide slide portion slides along the first guide groove in a direction away from the middle plate module, the folding center point G of the screen abuts against the middle plate module, the damping arm slides through the second guide slide portion and the second guide groove of the door panel, the two door panels are respectively bonded to the screen to form a second constraint point D1 for the screen, the middle frame rotates along the connecting member and moves through the third guide slide portion and the third guide groove of the door panel in a direction away from the middle plate module, the second guide slide portion slides along the second guide groove to one end of the second guide groove close to the middle plate module, leading the two door panels to rotate, so that the second constraint point D1 moves up a distance H toward the middle frame to form a third constraint point D2, so that the screen between the first constraint point A and the third constraint point D2 remains in a straight state.

[0011] Beneficial effects of the present invention: The present invention forms a first constraint point A for the screen by respectively bonding two middle frames to two ends of the screen, and forms a second constraint point D1 for the screen by respectively bonding two door panels to the screen. The connecting member is rotated relative to the middle panel module and drives the torque module, the door panel and the middle frame to work in conjunction to fold the screen. The two connecting members slide through the first guide sliding portion and the first guide groove of the door panel respectively, the middle frame rotates along the connecting member and moves through the third guide sliding portion and the third guide groove of the door panel. The two door panels rotate, and the second constraint point D1 moves up a distance H toward the middle frame to form a third constraint point D2, so that the screen between the first constraint point A and the third constraint point D2 remains in a straight state, thereby achieving the purpose of preventing the screen from arching, effectively extending the service life of the screen and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Figure 2 It is a schematic diagram of the front view structure of the screen of the present invention in an open state.

[0014] Figure 3 It is a schematic diagram of the dynamic structure of the door panel rotation of the present invention.

[0015] Figure 4 It is a schematic diagram of the front view structure of the screen of the present invention in a folded state.

[0016] Figure 5 It is a schematic diagram of the structure of the middle plate module and the torsion module of the present invention.

[0017] Figure 6 It is a schematic diagram of the structure of the middle plate module of the present invention.

[0018] Figure 7 It is a structural schematic diagram of the connection state of the middle plate A and the middle plate B of the present invention.

[0019] Figure 8 It is a structural schematic diagram of the middle plate A and the middle plate B in the separated state of the present invention.

[0020] Fig. 9 It is a schematic structural diagram of the middle plate of the present invention in a disassembled state.

[0021] Fig.10 It is a schematic diagram of the torque module structure of the present invention.

[0022] Fig.11 It is a schematic diagram of the damping arm structure of the present invention.

[0023] Fig.12 It is a schematic diagram of the structure of the wear-resistant part of the present invention.

[0024] Fig.13 It is a schematic diagram of the gear arm structure of the present invention.

[0025] Fig.14 It is a schematic structural diagram of the damping mechanism of the present invention in an exploded state.

[0026] Fig.15 It is a schematic diagram of the door panel and middle frame structure of the present invention.

[0027] Reference numerals include:

[0028] 1. Middle plate module; 11. Connecting piece; 111. Fourth guide slide; 112. Abutting groove; 12. First guide slide; 13. Middle plate A; 131. First connecting part; 132. Matching connecting groove; 133. First bevel; 14. Middle plate B; 141. Second connecting part; 142. Extending edge; 143. Second bevel; 144. Connecting hole; 15. Sliding matching part; 151. Protruding piece; 16. Limiting piece; 17. Fourth guide groove; 18. Sinking groove; 181. Avoidance position; 182. Positioning protrusion; 100. Screen; 101. Connection adjustment groove; 102. Welding groove; 103. Through-connecting groove; 2. Torque module; 21. Damping arm; 211. Fixing seat; 2111. Shaft rod; 212. Gear arm ; 2121, the fifth guide slide; 2122, the stop block; 213, the gear; 214, the damping mechanism; 2141, the slide seat; 2142, the reset member; 2143, the limit seat; 2144, the limit plate; 2145, the limit block; 215, the fixed slot; 216, the matching slide; 22, the second guide slide; 23, the wear-resistant part; 231, the connecting end; 232, the friction wave end; 3, the door panel; 31, the first guide groove; 32, the second guide groove; 321, the first guide slide section; 322, the second guide slide section; 323, the third guide slide section; 324, the damping step; 33, the third guide groove; 34, the friction block; 4, the middle frame; 41, the third guide slide; 42, the connecting seat; 43, the fifth guide groove; 44, the limit groove. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings.

[0030] See also Figures 1 to 15 As shown, a folding hinge mechanism for preventing a screen from arching of the present invention comprises a middle plate module 1, a torsion module 2, a door panel 3 and a middle frame 4.

[0031] The middle plate module 1 is rotatably provided with a connecting member 11, the connecting member 11 is hinged with the middle frame 4, the connecting member 11 is provided with a first guide slide portion 12, and the door panel 3 is provided with a first guide groove 31 that cooperates with the first guide slide portion 12. The connecting member 11 and the door panel 3 slide in cooperation with each other through the first guide slide portion 12 and the first guide groove 31. Specifically, the first guide slide portion 12 is a guide slide block or a guide slide rod, and the first guide groove 31 is an arc-shaped guide groove, such as a C-shaped, U-shaped or V-shaped. In this embodiment, the first guide slide portion 12 is a guide slide block, and the first guide groove 31 is an example of a C-shaped guide groove.

[0032] The torque module 2 is fixed to the middle plate module 1, and the torque module 2 is rotatably provided with a damping arm 21, and the damping arm 21 is slidably connected with the door panel 3, and the damping arm 21 is provided with a second guide slide portion 22, and the door panel 3 is provided with a second guide groove 32 that cooperates with the second guide slide portion 22. The door panel 3 and the damping arm 21 slide in cooperation with each other through the second guide slide portion 22 and the second guide groove 32. Specifically, the second guide slide portion 22 is a guide slide block or a guide slide rod, and the second guide groove 32 is an arc-shaped guide groove, such as an S-shaped or Z-shaped guide groove. In this embodiment, the second guide slide portion 22 is a guide slide block, and the second guide groove 32 is an S-shaped guide groove.

[0033] The door panel 3 is slidably connected with the middle frame 4, the door panel 3 is provided with a third guide groove 33, and the middle frame 4 is provided with a third guide slide portion 41 that cooperates with the third guide groove 33. The door panel 3 and the middle frame 4 slide in cooperation with each other through the third guide slide portion 41 and the third guide groove 33. Specifically, the third guide slide portion 41 is a guide slide block or a guide slide rod, and the third guide groove 33 is an arc-shaped guide groove, such as a C-shaped or J-shaped one. In this embodiment, the third guide slide portion 41 is a guide slide block, and the third guide groove 33 is an example of a C-shaped guide groove.

[0034] The number of the middle frame 4 , the door panel 3 , the connecting member 11 and the damping arm 21 are all two and they are arranged relative to the middle panel module 1 .

[0035] When in use, the two middle frames 4 are respectively bonded to the two ends of the screen 100 to form the first constraint point A of the screen 100, the connecting member 11 rotates relative to the middle plate module 1 to approach each other and drive the torque module 2, the door panel 3 and the middle frame 4 to fold the screen 100, the two connecting members 11 slide respectively through the first guide slide 12 and the first guide groove 31 of the door panel 3, the first guide slide 12 slides along the first guide groove 31 away from the middle plate module 1, and the folding center point G of the screen 100 abuts against the middle plate module 1. The screen 100 continues to fold, the damping arm 21 slides through the second guide slide 22 and the second guide groove 32 of the door panel 3, and the two door panels 3 are respectively bonded to the screen 100 to form the second constraint point D1 of the screen 100. As the screen 100 continues to fold, the middle frame 4 rotates along the connecting piece 11 and moves away from the middle plate module 1 through the third guide slide portion 41 and the third guide groove 33 of the door panel 3. The second guide slide portion 22 slides along the second guide groove 32 to the end of the second guide groove 32 close to the middle plate module 1, leading the two door panels 3 to rotate, so that the second constraint point D1 moves up a distance H along the Y axis toward the middle frame 4 to form a third constraint point D2, so that the screen 100 between the first constraint point A and the third constraint point D2 remains in a straight state, thereby preventing the screen 100 from arching, effectively extending the service life of the screen 100 and improving the user experience.

[0036] On the other hand, the connecting member 11 and the door panel 3 slide together through the first guide portion 12 and the first guide groove 31, the door panel 3 and the damping arm 21 slide together through the second guide portion 22 and the second guide groove 32, and the door panel 3 and the middle frame 4 slide together through the third guide portion 41 and the third guide groove 33, so that the folding hinge mechanism folding the screen 100 or unfolding the screen 100 is limited and guided by the torque module 2, and the use process of the folding hinge mechanism folding the screen 100 or unfolding the screen 100 is more labor-saving, thereby improving the user experience.

[0037] The distance between the first constraint point A and the second constraint point D1 is greater than the distance between the first constraint point A and the third constraint point D2. The height of the distance H is 0.2-0.7 MM, and the embodiment takes the height of H as 0.3 MM as an example.

[0038] See also Figures 5 to 9 As shown, the middle plate module 1 of this embodiment includes a middle plate A13 and a middle plate B14.

[0039] Both ends of the middle plate A13 are provided with a first connecting portion 131 , and the middle plate B14 is provided with a second connecting portion 141 . The first connecting portion 131 is provided with a matching connecting groove 132 and a first oblique edge 133 , and the second connecting portion 141 is provided with an extending edge 142 and a second oblique edge 143 .

[0040] Specifically, the first connection portion 131 is a concave or convex structure, and the second connection portion 141 is a concave or convex structure. In this embodiment, the first connection portion 131 is a convex structure, and the second connection portion 141 is a concave structure.

[0041] There are two middle plates B14, and the two middle plates B14 are respectively connected to the first connecting parts 131 at both ends of the middle plate A13 through the second connecting parts 141. The matching connecting grooves 132 and the extended edges 142 abut against each other, and the distance between the first connecting parts 131 and the second connecting parts 141 forms a connecting adjustment groove 101. The size of the middle plate module 1 is changed by adjusting the distance between the adjustment grooves 101, so that the middle plate module 1 can adapt to screens 100 of different sizes.

[0042] The first bevel 133 and the second bevel 143 form a welding groove 102. The welding groove 102 facilitates the first connection portion 131 and the second connection portion 141 to be fixed by welding.

[0043] See also Figure 7 and Figure 8 As shown, the middle plate A13 and the middle plate B14 of this embodiment are both provided with a through-connecting groove 103, and the through-connecting groove 103 is arranged along the axis of the middle plate A13 and the middle plate B14.

[0044] The second bevel 143 is penetrated by a connecting hole 144, and the second bevel 143 is connected to the through connecting groove 103 through the connecting hole 144, so that the connection adjustment groove 101, the welding groove 102 and the through connecting groove 103 are all connected. Solder enters the connection adjustment groove 101, the welding groove 102 and the through connecting groove 103 respectively, so that the first connection part 131 and the second connection part 141 are more firmly welded and fixed.

[0045] See also Fig. 9 As shown, the middle plate A13 and the middle plate B14 of this embodiment are both provided with a sliding fitting portion 15 and a limiting member 16, wherein the limiting member 16 is a limiting cover.

[0046] The sliding fitting portion 15 and the stopper 16 are both provided with a fourth guide groove 17, and the connecting member 11 is provided with a fourth guide slide portion 111, and the fourth guide slide portion 111 is slidably connected with the fourth guide groove 17. Specifically, the fourth guide slide portion 111 is a C-shaped slider, and the fourth guide groove 17 is a C-shaped slide groove. The fourth guide slide portion 111 is slidably connected with the fourth guide groove 17 to guide the connecting member 11 and the middle plate module 1 to rotate.

[0047] The sliding fitting portion 15 is provided with a protrusion 151, and the connecting member 11 is provided with an abutting groove 112, and the abutting groove 112 is matched and connected with the protrusion 151. Specifically, when the screen 100 is flattened, the abutting groove 112 abuts against the protrusion 151 to play a role of limiting.

[0048] See also Figures 10 to 14 As shown, the damping arm 21 of this embodiment includes a fixing seat 211 , a gear arm 212 , a gear 213 and a damping mechanism 214 .

[0049] The gear arm 212 is rotatably connected to the fixing base 211 .

[0050] There are two damping mechanisms 214, which are respectively slidably connected to the two ends of the gear arm 212 and frictionally connected relative to the wheel arm. A wear-resistant part 23 is provided at the connection between the damping mechanism 214 and the gear arm 212. The wear-resistant part 23 reduces the friction and wear at the connection between the damping mechanism 214 and the gear arm 212. The service life of the gear arm 212 is extended, thereby achieving higher stability and extended service life of the equipment.

[0051] There are two gears 213 , and the two gears 213 are meshed with each other. The gears 213 are rotatably disposed between the fixing seat 211 and the damping mechanism 214 . Both damping arms 21 are meshed and connected with the gears 213 , and the two damping arms 21 are linked.

[0052] Specifically, the wear-resistant part 23 is made of zirconia ceramics, and the Mohs hardness of zirconia ceramics is between 8.5 and 9.1, which reduces scratches on the wear-resistant part 23 caused by metal materials and avoids wear and deformation of the wear-resistant part 23 during friction.

[0053] The surface glossiness of the polished zirconium oxide ceramic is Ra value ≤ 0.03, which reduces the fine cutting caused by the friction between the two wear-resistant parts 23. The greater the hardness of the wear-resistant part 23 material, the smoother the surface, and the smaller the friction coefficient between the products.

[0054] Zirconia ceramics are less affected by thermal expansion and contraction, reducing the impact of temperature differences on spatial changes and affecting work performance.

[0055] The three-point bending strength of zirconia ceramics is at least 1000Mpa to ensure stable operation of the product.

[0056] Since ceramics are highly resistant to corrosion, the effects of dimensional changes caused by contact with cosmetics and chemicals are reduced, thus ensuring normal operation.

[0057] The wear-resistant part 23 has high strength and hardness, excellent mechanical properties, wear resistance, scratch resistance, good chemical stability, acid and alkali corrosion resistance, and can remain stable in many harsh environments. It has a high melting point, can work normally in a high temperature environment, and has good electrical insulation.

[0058] See also Figures 10 to 12 As shown, the damping mechanism 214 and the gear arm 212 of this embodiment are both provided with a fixed slot 215 , one end of the wear-resistant part 23 is provided with a connecting end 231 , and the other end of the wear-resistant part 23 is provided with a friction wave end 232 .

[0059] The wear-resistant member 23 is respectively fixed to the damping mechanism 214 and the fixing slot 215 of the gear arm 212 through the connecting end 231 , so that the wear-resistant member 23 is connected between the damping mechanism 214 and the gear arm 212 .

[0060] The two wear-resistant parts 23 arranged opposite to each other are connected to each other by friction and rotation through the friction wave ends 232 , and the mutual friction and rotation of the friction wave ends 232 provide damping when the damping arm 21 rotates.

[0061] See also Figure 2 and Fig.13As shown, the gear arm 212 of this embodiment is provided with a matching slide groove 216, the second guide slide portion 22 is provided inside the matching slide groove 216, the second guide groove 32 is provided with a first guide slide section 321, a second guide slide section 322 and a third guide slide section 323 in sequence in a direction away from the middle plate module 1, and a damping step 324 is provided at one end of the third guide slide section 323 away from the second guide slide section 322. When the screen 100 is unfolded, the second guide slide portion 22 is clamped on the damping step 324, so that the screen 100 has a certain damping when unfolded, so that the screen 100 can be kept in the unfolded state.

[0062] See also Figure 4 As shown, when the second guide slide 22 slides along the directions of the third guide slide 323, the second guide slide 322 and the first guide slide 321 through the guidance of the first guide slide section 321, the second guide slide section 322 and the third guide slide section 323, the two door panels 3 rotate and approach each other, so that the second constraint point D1 moves up toward the middle plate module 1, and the first constraint point A and the second constraint point D1 move away from each other, so that the screen 100 between the first constraint point A and the second constraint point D1 remains in a straight state, thereby achieving the purpose of preventing the screen 100 from arching.

[0063] See also Fig.15 As shown, preferably, the door panel 3 is provided with a friction block 34 frictionally connected with the matching slide groove 216. The friction between the matching slide groove 216 and the friction block 34 increases the stability of the sliding connection between the door panel 3 and the gear arm 212.

[0064] The middle frame 4 of this embodiment is provided with a connecting seat 42 , the connecting seat 42 is hinged to the connecting member 11 , and the third sliding guide 41 is provided on the connecting seat 42 , so that the middle frame 4 is slidably connected with the middle frame 4 through the connecting seat 42 .

[0065] The connecting seat 42 is provided with a fifth guide groove 43, and the gear arm 212 is provided with a fifth guide slide portion 2121 matched with the fifth guide groove 43. Specifically, the fifth guide slide portion 2121 is a guide slide block or a guide slide edge, and in this embodiment, the fifth guide slide portion 2121 is exemplified by a guide slide edge.

[0066] The connection seat 42 is provided with a limiting groove 44, and the gear arm 212 is provided with a stopper 2122 matched with the limiting groove 44, and the limiting groove 44 is matched and connected with the stopper 2122. Specifically, when the screen 100 is flattened, the stopper 2122 abuts against the limiting groove 44.

[0067] See also Figures 10 to 14 As shown, shafts 2111 are respectively provided on both sides of the fixing base 211 of this embodiment, so that the gear arm 212 is rotatably connected to the fixing base 211 through the shafts 2111 .

[0068] The two damping mechanisms 214 are both disposed at the two ends of the shaft 2111 , so that the two damping mechanisms 214 are respectively slidably connected to the two ends of the gear arm 212 and frictionally connected relative to the wheel arm.

[0069] See also Fig.14 As shown, the damping mechanism 214 includes a sliding seat 2141 , a restoring member 2142 , a limiting seat 2143 and a limiting plate 2144 .

[0070] The sliding seat 2141 is slidably connected to the two shaft rods 2111 respectively, and the limiting seat 2143 and the limiting plate 2144 are fixed to the ends of the two shaft rods 2111 respectively.

[0071] There are two reset members 2142, which are springs or shrapnel. In this embodiment, the reset members 2142 are springs. The two reset members 2142 are respectively sleeved on the two shafts 2111 and abut between the slide seat 2141 and the limit seat 2143. The damping mechanism 214 is provided with a reverse force through the reset members 2142, so that the damping mechanism 214 has linear damping, so that the two wear-resistant members 23 at the connection between the damping mechanism 214 and the gear arm 212 keep in contact with each other.

[0072] The wear-resistant member 23 is disposed at one end of the slide seat 2141 facing the gear arm 212. The wear-resistant member 23 is disposed at the connection between the damping mechanism 214 and the gear arm 212.

[0073] The limit seat 2143 is provided with a limit block 2145 for limiting the sliding stroke of the slide seat 2141. The sliding stroke of the slide seat 2141 is limited by the limit block 2145.

[0074] See also Fig. 9 As shown, the middle plate B14 of this embodiment is provided with a sinking groove 18 for accommodating the gear arm 212, and the sinking groove 18 is provided with an avoidance position 181 and a positioning protrusion 182, the avoidance position 181 is provided in the middle of the sinking groove 18, and the positioning protrusion 182 is provided at one end of the sinking groove 18.

[0075] The gear arm 212 is given space by the avoidance position 181 to avoid the middle plate B14 from interfering with the rotation of the gear arm 212. The damping mechanism 214 is conveniently positioned and installed by the positioning protrusion 182 contacting with the damping mechanism 214.

[0076] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A folding hinge mechanism for preventing a screen from arching, characterized in that: It includes a middle plate module (1), a torque module (2), a door panel (3) and a middle frame (4). The middle plate module (1) is rotatably provided with a connecting piece (11), the connecting piece (11) is hinged to the middle frame (4), the connecting piece (11) is provided with a first guide slide portion (12), and the door panel (3) is provided with a first guide groove (31) matched with the first guide slide portion (12); The torque module (2) is fixed to the middle plate module (1); the torque module (2) is rotatably provided with a damping arm (21); the damping arm (21) is slidably connected with the door panel (3); the damping arm (21) is provided with a second guide slide portion (22); and the door panel (3) is provided with a second guide groove (32) matched with the second guide slide portion (22); The door panel (3) is slidably connected to the middle frame (4); the door panel (3) is provided with a third guide groove (33); and the middle frame (4) is provided with a third guide slide portion (41) matched with the third guide groove (33); The number of the middle frame (4), the door panel (3), the connecting member (11) and the damping arm (21) are all two and they are arranged relative to the middle panel module (1); The two middle frames (4) are respectively bonded to the two ends of the screen (100) to form a first constraint point A for the screen (100); the connecting member (11) rotates relative to the middle plate module (1) to approach each other and drive the torque module (2), the door panel (3) and the middle frame (4) to work together to fold the screen (100); the two connecting members (11) slide respectively through the first guide slide portion (12) and the first guide groove (31) of the door panel (3); the first guide slide portion (12) slides along the first guide groove (31) in a direction away from the middle plate module (1); the folding center point G of the screen (100) abuts against the middle plate module (1); the damping arm (21) is connected to the door panel (3) through the second guide slide portion (22); The second guide groove (32) slides, and the two door panels (3) are respectively bonded to the screen (100) to form a second constraint point D1 for the screen (100). The middle frame (4) rotates along the connecting piece (11) and moves in a direction away from the middle plate module (1) through the third guide slide portion (41) and the third guide groove (33) of the door panel (3). The second guide slide portion (22) slides along the second guide groove (32) to an end of the second guide groove (32) close to the middle plate module (1), leading the two door panels (3) to rotate, so that the second constraint point D1 moves up a distance H in the direction of the middle frame (4) to form a third constraint point D2, so that the screen (100) between the first constraint point A and the third constraint point D2 remains in a straight state.

2. A folding hinge mechanism for preventing screen from arching according to claim 1, characterized in that: The middle plate module (1) comprises a middle plate A (13) and a middle plate B (14), Both ends of the middle plate A (13) are provided with a first connecting portion (131), and the middle plate B (14) is provided with a second connecting portion (141), the first connecting portion (131) is provided with a matching connecting groove (132) and a first oblique edge (133), and the second connecting portion (141) is provided with an extended edge (142) and a second oblique edge (143), The number of the middle plates B (14) is two, and the two middle plates B (14) are respectively connected to the first connecting parts (131) at both ends of the middle plate A (13) through the second connecting parts (141), the matching connecting groove (132) and the extending edge (142) abut against each other, and the distance between the first connecting part (131) and the second connecting part (141) forms a connecting adjustment groove (101), and the first oblique edge (133) and the second oblique edge (143) form a welding groove (102).

3. The folding hinge mechanism for preventing the screen from arching according to claim 2, characterized in that: The middle plate A (13) and the middle plate B (14) are both provided with a through-connecting groove (103), and the through-connecting groove (103) is arranged along the axis of the middle plate A (13) and the middle plate B (14); the second bevel (143) is provided with a connecting hole (144) through it, and the second bevel (143) is connected with the through-connecting groove (103) through the connecting hole (144), so that the connection adjustment groove (101), the welding groove (102) and the through-connecting groove (103) are all connected.

4. The folding hinge mechanism for preventing the screen from arching according to claim 2, characterized in that: The middle plate A (13) and the middle plate B (14) are both provided with a sliding matching portion (15) and a limiting member (16), the sliding matching portion (15) and the limiting member (16) are both provided with a fourth guide groove (17), the connecting member (11) is provided with a fourth guide sliding portion (111), and the fourth guide sliding portion (111) is slidably connected to the fourth guide groove (17); The sliding fitting portion (15) is provided with a protruding piece (151), and the connecting piece (11) is provided with an abutting groove (112), and the abutting groove (112) is matched and connected with the protruding piece (151).

5. The folding hinge mechanism for preventing screen from arching according to claim 2, characterized in that: The damping arm (21) comprises a fixing seat (211), a gear arm (212), a gear (213) and a damping mechanism (214). The gear arm (212) is rotatably connected to the fixing seat (211); The number of the damping mechanisms (214) is two, the two damping mechanisms (214) are respectively slidably connected to the two ends of the gear arm (212) and are frictionally connected relative to the wheel arm, and a wear-resistant part (23) is provided at the connection between the damping mechanism (214) and the gear arm (212); The gear (213) is rotatably disposed between the fixing seat (211) and the damping mechanism (214), and both of the damping arms (21) are meshingly connected with the gear (213).

6. The folding hinge mechanism for preventing the screen from arching according to claim 5, characterized in that: The damping mechanism (214) and the gear arm (212) are both provided with a fixed slot (215); one end of the wear-resistant part (23) is provided with a connecting end (231); and the other end of the wear-resistant part (23) is provided with a friction wave end (232); The wear-resistant parts (23) are respectively fixed to the damping mechanism (214) and the fixed slot (215) of the gear arm (212) through the connecting ends (231), and the two wear-resistant parts (23) arranged opposite to each other are frictionally rotatably connected to each other through the friction wave ends (232).

7. The folding hinge mechanism for preventing screen from arching according to claim 5, characterized in that: The gear arm (212) is provided with a matching slide groove (216), the second guide slide portion (22) is arranged inside the matching slide groove (216), the second guide groove (32) is provided with a first guide slide section (321), a second guide slide section (322) and a third guide slide section (323) in sequence along a direction away from the middle plate module (1), and a damping step (324) is provided at one end of the third guide slide section (323) away from the second guide slide section (322).

8. The folding hinge mechanism for preventing screen from arching according to claim 7, characterized in that: The middle frame (4) is provided with a connecting seat (42), the connecting seat (42) is hinged to the connecting member (11), and the third guide slide portion (41) is provided on the connecting seat (42); The connecting seat (42) is provided with a fifth guide groove (43), and the gear arm (212) is provided with a fifth guide sliding portion (2121) matched with the fifth guide groove (43); The connection seat (42) is provided with a limiting groove (44), the gear arm (212) is provided with a stop block (2122) matched with the limiting groove (44), and the limiting groove (44) is matched and connected with the stop block (2122).

9. The folding hinge mechanism for preventing screen from arching according to claim 5, characterized in that: A shaft (2111) is provided on both sides of the fixing seat (211), and the two damping mechanisms (214) are both passed through the two ends of the shaft (2111); The damping mechanism (214) comprises a sliding seat (2141), a reset member (2142), a limiting seat (2143) and a limiting plate (2144); The sliding seat (2141) is slidably connected to the two shafts (2111) respectively, and the limiting seat (2143) and the limiting plate (2144) are respectively fixed to the ends of the two shafts (2111); The number of the reset members (2142) is two, and the two reset members (2142) are respectively sleeved on the two shafts (2111) and abutted between the sliding seat (2141) and the limiting seat (2143); The wear-resistant part (23) is arranged at one end of the slide seat (2141) facing the gear arm (212); The limit seat (2143) is provided with a limit block (2145) for limiting the sliding stroke of the slide seat (2141).

10. The folding hinge mechanism for preventing screen from arching according to claim 9, characterized in that: The middle plate B (14) is provided with a sinking groove (18) for accommodating the gear arm (212); the sinking groove (18) is provided with an avoidance position (181) and a positioning protrusion (182); the avoidance position (181) is provided at the middle of the sinking groove (18); and the positioning protrusion (182) is provided at one end of the sinking groove (18).

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