Folding screen hinge mechanism and folding electronic equipment

Abstract

The invention discloses a folding screen hinge mechanism and folding electronic equipment, and relates to the technical field of screen folding, the folding screen hinge mechanism comprises a substrate, and the substrate is provided with at least one torsion assembly and at least two hinge assemblies used for driving a folding screen to be opened and closed; the hinge assembly comprises a hinge plate movably connected with the base plate, a cover plate used for restraining the rotating angle of the hinge plate is installed on the base plate, an opening allowing the hinge plate to penetrate through is formed in the cover plate, a connecting plate is hinged to the side, away from the base plate, of the hinge plate, and an integrally-formed protrusion is arranged on the base plate. The bulge is used for restraining the rotation angle of the hinged plate; the torsion assembly is connected with a guide base and a guide cover, and a guide groove is formed in the side wall of the guide base. Motion damping is provided for the two hinge assemblies at the same time through the torsion assembly, and synchronism of the two hinge assemblies in the folding and unfolding process can be effectively balanced. Therefore, the technical problem of asynchronous opening and closing movement of the hinge in the folding electronic equipment is solved.

Description

Technical Field

[0001] The present invention relates to the field of screen folding technology, and in particular to a folding screen hinge mechanism and a folding electronic device. Background Art

[0002] With the rapid development of mobile Internet and the increasing power of smart terminals, users have dual, almost contradictory demands for screen size and portability of electronic devices (especially smartphones and tablets). On the one hand, they want larger screens to enhance the immersion and efficiency of audio and video entertainment, multitasking, reading, and productivity applications. On the other hand, they want devices that are thin, light, and compact enough to be held in one hand, put in a pocket, or carried around.

[0003] In existing technology, the core components of foldable electronic devices are the foldable display screen and the folding structure that supports it for reliable, stable, and repeated opening and closing. Through the designed folding structure, the electronic device can provide a large-screen experience similar to that of a tablet in the unfolded state, while reducing its size in the folded state. However, foldable electronic devices typically have two or more screens connected by a hinge. During the opening and closing process, the movement of the left and right hinges is asynchronous (for example, one side moves faster than the other), causing uneven stress on the flexible screen area connecting the two screens, which can easily cause distortion, wrinkles, and even damage to the screen. Summary of the Invention

[0004] The purpose of the present invention is to provide a folding screen hinge mechanism and a folding electronic device, which solves the technical problem of asynchronous opening and closing movement of the hinge in the folding electronic device.

[0005] To achieve this object, the present invention adopts the following technical solutions: According to a first aspect, the present invention provides a folding screen hinge mechanism, comprising a base plate, on which is provided at least one torsion assembly and at least two hinge assemblies for driving the folding screen to open and close, wherein the at least two hinge assemblies are distributed on both sides of the base plate, and each torsion assembly is used to provide damping for the movement of the two hinge assemblies; The hinge assembly includes a hinge plate movably connected to the base plate, a cover plate mounted on the base plate for restricting the rotation angle of the hinge plate, the cover plate being provided with an opening for accommodating the hinge plate, a connecting plate being hingedly connected on a side of the hinge plate away from the base plate, and an integrally formed protrusion being provided on the base plate for restricting the rotation angle of the hinge plate; The torsion assembly is connected to a guide seat and a guide cover. The side wall of the guide seat is provided with a guide groove for providing a movement trajectory for the movement of the torsion assembly. The guide seat and the guide cover are fixedly connected by a guide screw.

[0006] Optionally, the torsion assembly includes a torsion base frame, the torsion base frame is rotatably connected to two torsion arms and a torsion gear located between the two torsion arms, and the two torsion gears are meshed with each other; One end of the torque arm away from the torque gear is slidably connected to the connecting plate, one end of the torque arm is provided with a gear portion meshing with the torque gear, and the other end of the torque arm is provided with a moving portion embedded in the guide groove; Two first torsion springs are installed in the torsion base frame, and the first torsion springs correspond to the torsion arms one by one.

[0007] Optionally, the torsion base comprises two first torsion bars arranged in parallel, a first torsion plate, a first torsion seat, a second torsion seat and a third torsion seat are sequentially sleeved on the first torsion bars, and the second torsion seat is fixedly connected to the base plate; The first torsion spring is sleeved with the first torsion rod, and the two ends of the first torsion spring are respectively abutted against the first torsion plate and the first torsion seat; the torsion arm is respectively rotationally abutted against the first torsion seat and the third torsion seat, and the torsion gear is rotationally connected between the second torsion seat and the third torsion seat.

[0008] Optionally, a second torsion rod is provided between the first torsion plate and the first torsion seat and is arranged parallel to the first torsion rod, and a second torsion spring is sleeved on the second torsion rod; One end of the second torsion rod is fixedly connected to the first torsion plate, and the first torsion seat is movably connected to the other end of the second torsion rod.

[0009] Optionally, a plurality of first protrusions are provided at both ends of the first torque seat, a plurality of second protrusions are provided at one end of the torque arm close to the first torque seat, the second protrusions are in contact with the first protrusions, and the first protrusions and the second protrusions are alternately distributed along the circumference of the first torsion bar; A plurality of third protrusions are provided at both ends of the third torque seat, and a plurality of fourth protrusions are provided at one end of the torque arm close to the third torque seat. The fourth protrusions are in contact with the third protrusions, and the fourth protrusions and the third protrusions are alternately distributed along the circumference of the first torsion bar.

[0010] Optionally, the first protrusion is provided with two first torsion inclined surfaces arranged at an angle, and the second protrusion is provided with two second torsion inclined surfaces arranged at an angle and corresponding to the first torsion inclined surfaces; The third protrusion is provided with two third torsion inclined surfaces arranged at an angle, and the fourth protrusion is provided with two fourth torsion inclined surfaces arranged at an angle and corresponding to the third torsion inclined surfaces.

[0011] Optionally, the torque arm is provided with a rotation groove located between the second protrusion and the fourth protrusion, and the end of the second torque seat is embedded in the rotation groove; The torque arm is provided with a rotating part located in the rotating groove, the second torque seat is provided with a limiting part that cooperates with the rotating part, and the limiting part is provided with a first limiting surface, a second limiting surface and a third limiting surface that are connected in sequence, and the first limiting surface and the third limiting surface are both used for limiting abutment with the rotating part; the second limiting surface is an arc surface and abuts with the first torsion bar.

[0012] Optionally, a second torsion plate is provided on a side of the first torsion plate opposite to the first torsion spring, a first mounting groove is provided on the first torsion rod, and a second mounting groove is provided on the second torsion plate to be inserted and matched with the first mounting groove; The second torsion plate is provided with an integrally formed plug post, and the first torsion plate is provided with a socket for plugging with the plug post.

[0013] Optionally, the base plate is provided with an integrally formed positioning post, the cover plate is provided with a positioning hole plugged into and mated with the positioning post, the four sides of the cover plate are fixedly connected to the base plate by a first fastening screw, and the middle of the cover plate is fixedly connected to the base plate by a second fastening screw; The cover plate is provided with two first abutting portions and two second abutting portions, the first abutting portions and the second abutting portions correspond one to one and enclose the opening, the two first abutting portions are symmetrically arranged, and the two second abutting portions are symmetrically arranged.

[0014] According to a second aspect, the present invention provides a foldable electronic device, comprising a first foldable screen, a second foldable screen, and a third foldable screen, wherein the foldable screen hinge mechanism described in the first aspect is connected between the first foldable screen and the second foldable screen, and between the second foldable screen and the third foldable screen, respectively; Among them, the third folding screen is folded and overlapped with the second folding screen, and the first folding screen is folded and overlapped with the third folding screen; the first folding screen and the third folding screen are both wedge-shaped.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a folding screen hinge mechanism and a folding electronic device, which provide motion damping to two hinge assemblies at the same time through a torsion assembly, can effectively balance the synchronization of the two hinge assemblies during the folding and unfolding process, and prevent the folding screen from shaking or getting stuck due to uneven force during the opening or closing process, thereby improving the smoothness of the folding process and the stability of the structure. Through the coordinated use of the hinge assembly and the torsion assembly, the overall structural layout is compact and reasonable, suitable for the design of various forms of folding screen devices, with good compatibility and scalability, easy to achieve modular integration and batch manufacturing, and reduce the difficulty of overall machine design and production costs. The torsion assembly is protected and limited by a guide seat and a guide cover, wherein the side wall of the guide seat is provided with a guide groove to provide an accurate trajectory for the movement of the torsion assembly. Through the use of the cover plate and the protrusion, the rotation range of the hinge plate can be precisely controlled, effectively avoiding structural interference or damage to the folding screen due to excessive rotation. Therefore, the present invention solves the technical problem of asynchronous hinge opening and closing movement in folding electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 2 A schematic diagram of the exploded structure of a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 3 A schematic structural diagram of a substrate in a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A; Figure 5 A schematic diagram of the partial structure of a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 6 This is a schematic structural diagram of a cover plate in a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 7 A schematic diagram of the three-dimensional structure of a torsion assembly in a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 8 This is a schematic diagram of the exploded structure of a torsion assembly in a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 9 This is a schematic diagram of the exploded structure of a torsion base in a folding screen hinge mechanism provided in Example 1 of the present invention; Figure 10 This is a schematic diagram of a partial structure of a torsion assembly in a folding screen hinge mechanism provided in the first embodiment of the present invention; Figure 11 This is a second schematic diagram of a partially exploded structure of a torsion assembly in a folding screen hinge mechanism provided in the first embodiment of the present invention; Figure 12 A schematic diagram of the three-dimensional structure of a foldable electronic device provided in Example 2 of the present invention.

[0019] Illustration: 10. Base plate; 11. Protrusion; 12. Positioning column; 20. Torque assembly; 21. Torque base; 211. First torsion bar; 2111. First mounting slot; 212. First torsion plate; 2121. Insertion hole; 213. First torque seat; 2131. First protrusion; 2132. First torsion inclined surface; 214. Second torque seat; 2141. Limiting portion; 2142. First limiting surface; 2143. Second limiting surface; 2144. Third limiting surface; 215. Third torque seat; 2151. Third protrusion; 2152, third torsion ramp; 216, second torsion bar; 217, second torsion plate; 2171, second mounting slot; 2172, plug post; 22, torque arm; 221, gear portion; 222, moving portion; 223, second protrusion; 2231, second torsion ramp; 224, fourth protrusion; 2241, fourth torsion ramp; 225, rotating slot; 226, rotating portion; 23, torque gear; 24, first torsion spring; 25, second torsion spring; 30. Hinge assembly; 31. Hinge plate; 32. Cover plate; 321. Opening; 322. Positioning hole; 323. First abutting portion; 324. Second abutting portion; 33. Connecting plate; 34. First fastening screw; 35. Second fastening screw; 40. Guide seat; 41. Guide groove; 50. Guide cover; 60. Guide screw; 100, first folding screen; 200, second folding screen; 300, third folding screen. DETAILED DESCRIPTION

[0020] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] Example 1: The embodiment of the present invention provides a folding screen hinge mechanism, such as Figures 1 to 12 As shown, the foldable screen includes a base plate 10, on which at least one torsion assembly 20 and at least two hinge assemblies 30 for driving the foldable screen to open and close are provided. The at least two hinge assemblies 30 are distributed on both sides of the base plate 10, and each torsion assembly 20 is used to provide damping for the movement of the two hinge assemblies 30; The hinge assembly 30 includes a hinge plate 31 movably connected to the base plate 10. A cover plate 32 is mounted on the base plate 10 to constrain the rotation angle of the hinge plate 31. The cover plate 32 has an opening 321 for allowing the hinge plate 31 to pass through. A connecting plate 33 is hingedly connected to the side of the hinge plate 31 away from the base plate 10. The base plate 10 has an integrally formed protrusion 11 for constraining the rotation angle of the hinge plate 31. The torsion assembly 20 is connected to a guide base 40 and a guide cover 50. The sidewall of the guide base 40 is provided with a guide groove 41 for providing a movement trajectory for the torsion assembly 20. The guide base 40 and the guide cover 50 are fixedly connected by guide screws 60. In this embodiment, the guide base 40 is connected to the folding screen.

[0024] It should be noted that the folding screen hinge mechanism provided by the present invention uses a torsion assembly 20 to simultaneously provide motion damping to both hinge assemblies 30. This effectively balances the synchronization of the two hinge assemblies 30 during folding and unfolding, preventing jitter or jamming of the folding screen due to uneven force during opening or closing, thereby improving the smoothness of the folding process and the stability of the structure. The coordinated use of the hinge assembly 30 and the torsion assembly 20 results in a compact and rational overall structural layout, suitable for various folding screen device designs. It offers excellent compatibility and scalability, facilitates modular integration and mass production, and reduces overall device design complexity and production costs. The torsion assembly 20 is protected and positioned by a guide base 40 and a guide cover 50. The sidewalls of the guide base 40 are provided with guide grooves 41, which provide a precise trajectory for the movement of the torsion assembly 20. The coordinated use of the cover plate 32 and the protrusion 11 enables precise control of the rotation range of the hinge plate 31, effectively preventing structural interference or damage to the folding screen due to excessive rotation. Therefore, the present invention solves the technical problem of asynchronous hinge opening and closing in folding electronic devices.

[0025] like Figures 1 to 8 As shown, the torsion assembly 20 includes a torsion base 21, to which two torsion arms 22 and a torsion gear 23 located between the two torsion arms 22 are rotatably connected, and the two torsion gears 23 are meshed with each other; Among them, one end of the torque arm 22 away from the torque gear 23 is slidingly connected to the connecting plate 33, one end of the torque arm 22 is provided with a gear portion 221 engaged with the torque gear 23, and the other end of the torque arm 22 is provided with a moving portion 222 embedded in the guide groove 41; two first torsion springs 24 are installed in the torsion base 21, and the first torsion springs 24 correspond to the torque arms 22 one by one.

[0026] It should be noted that the two torsion arms 22 can achieve torsional linkage between the hinge assemblies 30 on both sides through the torsion gear 23 that meshes with each other in the middle. When the torsion arm 22 on one side rotates, the torsion arm 22 on the other side can respond synchronously through the gears, thereby achieving coordinated control of the entire hinge system and improving the consistency and smoothness of the screen during folding or unfolding. Each torsion arm 22 is corresponding to a first torsion spring 24. The torsion spring provides continuous and controllable elastic damping during the rotation of the hinge, so that there is appropriate feedback force during the opening and closing process, preventing the folding screen from being impacted or damaged due to excessive changes in the folding angle, and also improving the user interaction experience. The torsion arm 22 is slidably connected to the connecting plate 33 and can achieve controlled displacement in the guide groove 41, effectively limiting the motion trajectory of the torsion arm 22, ensuring that it maintains controlled rotation under stress, avoiding the instability of the mechanism caused by free swinging, and enhancing the reliability and durability of the overall structure.

[0027] like Figures 7 to 9As shown, the torsion base 21 includes two first torsion bars 211 arranged in parallel, and the first torsion bars 211 are sequentially spaced and sleeved with a first torsion plate 212, a first torsion seat 213, a second torsion seat 214 and a third torsion seat 215, and the second torsion seat 214 is fixedly connected to the base plate 10; The first torsion spring 24 is sleeved with the first torsion rod 211, and the two ends of the first torsion spring 24 are respectively in contact with the first torsion plate 212 and the first torsion seat 213; the torque arm 22 is respectively in rotational contact with the first torsion seat 213 and the third torsion seat 215, and the torque gear 23 is rotationally connected between the second torsion seat 214 and the third torsion seat 215.

[0028] It should be noted that by sequentially mounting the first torsion plate 212, the first torsion seat 213, the second torsion seat 214, and the third torsion seat 215 on the first torsion rod 211, a hierarchical structural combination is formed. In particular, the second torsion seat 214 is fixedly connected to the base plate 10, making the entire torsion transmission path more stable, effectively improving the deformation resistance and overall structural strength of the torsion assembly 20 during operation. The provision of the first torsion spring 24 can generate a stable elastic restoring force during the folding or unfolding of the hinge assembly 30, with good linear torsional response, avoiding uneven elastic force output or hysteresis, and helping to achieve a more precise and smooth damping control effect. By the torque arm 22 being respectively rotatably abutted against the first torsion seat 213 and the third torsion seat 215, the distribution of the force support points of the torque arm 22 during movement is more rational, reducing rotational friction resistance, improving the stability and consistency of the overall movement, and preventing structural deflection or abnormal wear caused by single-point force. The torque gear 23 is arranged between the second torque seat 214 and the third torque seat 215 to form a double support structure, which not only ensures the axial stability of the torque gear 23 during the engagement process, but also reduces the tooth clearance fluctuation caused by torque changes, ensuring that the linkage effect between the two torque arms 22 is always reliable and stable.

[0029] like Figures 7 to 9 As shown, a second torsion rod 216 is provided between the first torsion plate 212 and the first torsion seat 213 and is arranged parallel to the first torsion rod 211 , and a second torsion spring 25 is sleeved on the second torsion rod 216 ; One end of the second torsion rod 216 is fixedly connected to the first torsion plate 212 , and the first torsion seat 213 is movably connected to the other end of the second torsion rod 216 .

[0030] It should be noted that by arranging the second torsion rod 216 parallel to the first torsion rod 211 and respectively housing the second torsion spring 25 and the first torsion spring 24, a dual-spring and dual-rod combination structure is formed. This effectively disperses stress concentration along the torsion transmission path, enhancing the torsional stability and structural fatigue life of the entire hinge system during repeated opening and closing. Since one end of the second torsion rod 216 is fixedly connected to the first torsion plate 212 and the other end is movably connected to the first torsion seat 213, the second torsion spring 25 generates an effective compression or recovery stroke during folding and opening. This, in turn, allows the second torsion spring 25 and the first torsion spring 24 to work synergistically, achieving a more flexible and precise elastic control curve that adapts to the mechanical requirements of different usage angles. While sharing the mechanical load, the dual torsion springs also mitigate the impact response of a single torsion spring under extreme conditions. This significantly improves impact resistance and fatigue durability, particularly during frequent use or large-angle folding, thereby extending the overall life of the hinge mechanism.

[0031] like Figures 7 to 11 As shown, a plurality of first protrusions 2131 are provided at both ends of the first torque seat 213, and a plurality of second protrusions 223 are provided at one end of the torque arm 22 close to the first torque seat 213. The second protrusions 223 are in contact with the first protrusions 2131, and the first protrusions 2131 and the second protrusions 223 are alternately distributed along the circumference of the first torsion bar 211; A plurality of third protrusions 2151 are provided at both ends of the third torque seat 215, and a plurality of fourth protrusions 224 are provided at one end of the torque arm 22 close to the third torque seat 215. The fourth protrusions 224 are in contact with the third protrusions 2151, and the fourth protrusions 224 and the third protrusions 2151 are alternately distributed along the circumference of the first torsion bar 211.

[0032] It should be noted that the alternating arrangement of the first and second protrusions 2131, 223, and the third and fourth protrusions 2151, 224 along the circumference of the first torsion bar 211, and their contact between the torsion arm 22 and the corresponding torsion seat, creates mechanical interference between adjacent protrusions when the torsion arm 22 rotates to a certain angle, thereby forming a physical limit, preventing excessive rotation of the torsion arm 22 and effectively protecting the torsion spring and torsion gear 23. The equidistant alternating structure formed by the multiple protrusions enables precise angular spacing control, keeping the relative rotation angle between each pair of protrusions within a certain range. This facilitates predictable and repeatable rotational travel during the hinge folding and unfolding process, improving the consistency and controllability of the overall motion behavior.

[0033] When the torque arm 22 is subjected to external impact or the user rapidly opens and closes it, the contact between the bumps effectively cushions the instantaneous impact, acting as a force transmitter and energy absorber. This prevents structural misalignment or abnormal rotation caused by severe vibration or spring rebound, thereby improving the mechanism's impact resistance and service life. Compared to a continuous sliding friction structure, the alternating bump contact structure only involves limited contact within a specific angular range during each opening and closing, significantly reducing the wear area and frequency between components. This extends the actual service life of the torque arm 22 and the torque seat, enhancing overall durability.

[0034] like Figures 7 to 12 As shown, the first protrusion 2131 is provided with two first torsion inclined surfaces 2132 arranged at an angle, and the second protrusion 223 is provided with two second torsion inclined surfaces 2231 arranged at an angle and corresponding to the first torsion inclined surfaces 2132; The third protrusion 2151 is provided with two third torsion inclined surfaces 2152 arranged at an angle thereto. The fourth protrusion 224 is provided with two fourth torsion inclined surfaces 2241 arranged at an angle thereto and corresponding to the third torsion inclined surfaces 2152 .

[0035] It should be noted that the torsion ramps provided on each protrusion correspond to each other, forming a stable inclined contact pairing relationship. During the rotation of the torque arm 22, when the two corresponding protrusions come into contact, the ramps form surface contact. Compared to traditional point or line contact, this can more evenly distribute stress, improve contact stability, and effectively mitigate impact force. Due to the angled fit between the two corresponding torsion ramps, when the torque arm 22 rotates, a certain oblique force component is generated, providing a rotational feedback force similar to "slow rise and slow fall", effectively improving the damping feel and operational smoothness felt by the user during folding or unfolding.

[0036] When the torque arm 22 rotates to near the set limit angle, the second torsion ramp 2231 will gradually contact the first torsion ramp 2132, forming surface contact between the ramps rather than point collision, thereby achieving a gradually applied limiting effect, reducing the impact force at the rotating end, significantly reducing noise and impact stress, and improving the smoothness and comfort of use. Inclined surface contact can disperse torque or external force from local point contact to extensive contact in the inclined surface area, effectively reducing the force intensity per unit area, alleviating wear, chipping, or material fatigue caused by hard limiting, and helping to improve component service life and structural reliability. The relative sliding of the inclined surface structure has a certain buffer stroke and works in conjunction with the first torsion spring 24 and the second torsion spring 25, which is equivalent to introducing a flexible damping mechanism into the structural limit, giving the rotating end a nonlinear deceleration characteristic, thereby improving the dynamic response and flexibility of the overall mechanical system.

[0037] like Figures 7 to 12As shown, the torque arm 22 is provided with a rotation groove 225 located between the second protrusion 223 and the fourth protrusion 224, and the end of the second torque seat 214 is embedded in the rotation groove 225; The torque arm 22 is provided with a rotating portion 226 located in the rotating groove 225, and the second torque seat 214 is provided with a limiting portion 2141 that cooperates with the rotating portion 226. The limiting portion 2141 is provided with a first limiting surface 2142, a second limiting surface 2143 and a third limiting surface 2144 that are connected in sequence. The first limiting surface 2142 and the third limiting surface 2144 are both used for limiting and abutting with the rotating portion 226; the second limiting surface 2143 is an arc surface and abuts against the first torsion rod 211.

[0038] It should be noted that the arc-shaped second limiting surface 2143 acts as a guide rail during the angle change during the entire rotation process, so that the rotating part 226 rotates along the preset path without easily deviating; the first limiting surface 2142 and the third limiting surface 2144 respectively control the starting and ending angles, avoiding the torque arm 22 from rotating beyond the limit, thereby improving the overall control performance and user experience.

[0039] As shown in the figure, a second torsion plate 217 is provided on one side of the first torsion plate 212 relative to the first torsion spring 24. A first mounting groove 2111 is provided on the first torsion rod 211, and a second mounting groove 2171 is provided on the second torsion plate 217 to be inserted and matched with the first mounting groove 2111. An integrally formed plug post 2172 is provided on the second torsion plate 217 , and a socket 2121 for plugging with the plug post 2172 is provided on the first torsion plate 212 .

[0040] It should be noted that the interlocking fit between the first mounting slot 2111 on the first torsion plate 212 and the second mounting slot 2171 on the second torsion plate 217 ensures accurate alignment during assembly, preventing component misalignment or loose connections caused by assembly errors, thereby improving the positioning accuracy and stability of the overall structure. The precise fit between the pin 2172 and the socket 2121, as well as the embedded structure of the mounting slots, simplifies the component assembly process, avoiding issues such as improper assembly or lost fasteners that can occur with traditional connection methods. Furthermore, the interlocking structure allows for more precise component positioning, adapting to the demands of high-precision machining and mass production, and reducing the difficulty of manufacturing and assembly.

[0041] like Figures 1 to 6 As shown, the base plate 10 is provided with an integrally formed positioning post 12, and the cover plate 32 is provided with a positioning hole 322 that plugs into the positioning post 12. The four sides of the cover plate 32 are fixedly connected to the base plate 10 by first fastening screws 34, and the middle of the cover plate 32 is fixedly connected to the base plate 10 by second fastening screws 35; The cover plate 32 has two first abutting portions 323 and two second abutting portions 324 . The first abutting portions 323 and the second abutting portions 324 correspond to each other and enclose the opening 321 . The two first abutting portions 323 and the two second abutting portions 324 are symmetrically arranged.

[0042] It should be noted that the interlocking engagement of the positioning posts 12 and the positioning holes 322 provides accurate positioning guidance during assembly of the cover plate 32 and the base plate 10, effectively preventing the cover plate 32 from misaligning or shifting before tightening, thereby improving overall assembly accuracy and consistency. The cover plate 32 is fixed to the base plate 10 on all four sides by first fastening screws 34 and reinforced in the middle by second fastening screws 35, achieving distributed fastening at multiple points. This significantly enhances the connection strength between the cover plate 32 and the base plate 10, effectively preventing the cover plate 32 from loosening or falling off due to long-term use, vibration, or external forces, and enhancing the overall structure's seismic resistance and long-term reliability. The first abutment portion 323 and the second abutment portion 324 correspond one-to-one and enclose an opening 321, which serves to constrain the passage path of the hinge plate 31. This structure not only provides mechanical guidance but also prevents the hinge plate 31 from deviating from its predetermined motion trajectory, thereby improving the accuracy and smoothness of the folding process.

[0043] Working principle: Before folding, the folding screen hinge mechanism is in a flat state, the moving portion 222 of the torque arm 22 is adjacent to the guide cover 50, the protrusion 11 is not in contact with the hinge plate 31, and the limiting portion 2141 of the torque arm 22 is in contact with the first limiting surface 2142; During the folding operation, since the guide seat 40 is connected to the folding screen, one of the guide seats 40 begins to fold. At the same time, the guide groove 41 on the side wall of the guide seat 40 pushes the movable portion 222 embedded therein, forcing the torque arm 22 to rotate around the first torsion bar 211. The gear portion 221 of the torque arm 22 drives the torque gear 23 to rotate. Since the two torque gears 23 are engaged with each other, the torque arm 22 on the other side rotates synchronously in the opposite direction, ensuring that the hinge assemblies 30 on both sides move synchronously, solving the technical problem of asynchronous opening and closing of the hinge in folding electronic devices. Since the torque arm 22 is slidably connected to the connecting plate 33, when the torque arm 22 moves, the connecting plate 33 drives the hinge plate 31 to fold. When the torque arm 22 rotates, the second torsion inclined surface 2231 contacts the first torsion inclined surface 2132, pushing the first torsion seat 213 to compress the first torsion spring 24 and the second torsion spring 25. At the same time, the fourth torsion inclined surface 2241 contacts the third torsion inclined surface 2152, pushing the third torsion seat 215 away from the second torsion seat 214, and driving the first torsion rod 211 and the second torsion rod 216 to move in the same direction, pulling the second torsion plate 217 and the first torsion plate 212 to move, so that the first torsion plate 212 also compresses the first torsion spring 24 and the second torsion spring 25, providing folding damping and improving the folding experience of the operator. When the second protrusion 223 passes over the currently contacted first protrusion 2131 and the fourth protrusion 224 passes over the currently contacted third protrusion 2151, the second protrusion 223 enters the gap between the two first protrusions 2131 and the fourth protrusion 224 enters the gap between the two third protrusions 2151. As the first torsion seat 213 and the third torsion seat 215 return to their original positions, the first torsion spring 24 and the second torsion spring 25 rebound, thereby limiting the folding of the torsion arm 22 and ensuring that the folding screen is stably limited after rotating to a certain angle, thereby solving the technical problem of limiting the rotation of the folding screen. When the torque arm 22 folds, the limiting portion 2141 of the torque arm 22 gradually moves away from the first limiting surface 2142. When the limiting portion 2141 contacts the third limiting surface 2144, the folding stroke of the torque arm 22 is limited to prevent the torque arm 22 from folding excessively. At the same time, the hinge plate 31 contacts the protrusion 11, realizing double limiting of the folding screen hinge mechanism, and solving the technical problem of folding limiting of the folding screen hinge mechanism.

[0044] Example 2: An embodiment of the present invention provides a foldable electronic device, such as Figure 12 As shown, it includes a foldable first folding screen 100, a second folding screen 200 and a third folding screen 300, and the folding screen hinge mechanism as described in Example 1 is connected between the first folding screen 100 and the second folding screen 200, and between the second folding screen 200 and the third folding screen 300 respectively; Among them, the third folding screen 300 is folded and overlapped with the second folding screen 200, and the first folding screen 100 is folded and overlapped with the third folding screen 300; the first folding screen 100 and the third folding screen 300 are both wedge-shaped.

[0045] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A folding screen hinge mechanism, characterized in that: The invention comprises a base plate (10), wherein the base plate (10) is provided with at least one torsion assembly (20) and at least two hinge assemblies (30) for driving the folding screen to open and close, wherein the at least two hinge assemblies (30) are distributed on both sides of the base plate (10), and each torsion assembly (20) is used to provide damping for the movement of the two hinge assemblies (30); The hinge assembly (30) comprises a hinge plate (31) movably connected to the base plate (10); a cover plate (32) for restricting the rotation angle of the hinge plate (31) is mounted on the base plate (10); an opening (321) for allowing the hinge plate (31) to pass through is provided on the cover plate (32); a connecting plate (33) is hingedly connected to a side of the hinge plate (31) away from the base plate (10); an integrally formed protrusion (11) is provided on the base plate (10); the protrusion (11) is used to restrict the rotation angle of the hinge plate (31); The torsion assembly (20) is connected to a guide seat (40) and a guide cover (50). A guide groove (41) is provided on a side wall of the guide seat (40) for providing a movement trajectory for the torsion assembly (20). The guide seat (40) and the guide cover (50) are fixedly connected via a guide screw (60).

2. The folding screen hinge mechanism according to claim 1, characterized in that: The torsion assembly (20) comprises a torsion base (21), two torsion arms (22) being rotatably connected to the torsion base (21) and a torsion gear (23) located between the two torsion arms (22), the two torsion gears (23) being meshed with each other; One end of the torque arm (22) away from the torque gear (23) is slidably connected to the connecting plate (33); one end of the torque arm (22) is provided with a gear portion (221) meshing with the torque gear (23); and the other end of the torque arm (22) is provided with a moving portion (222) embedded in the guide groove (41); Two first torsion springs (24) are installed in the torsion base frame (21), and the first torsion springs (24) correspond one to one to the torsion arms (22).

3. The folding screen hinge mechanism according to claim 2, characterized in that: The torsion base frame (21) comprises two first torsion bars (211) arranged in parallel, a first torsion plate (212), a first torsion seat (213), a second torsion seat (214) and a third torsion seat (215) being sequentially spaced apart on the first torsion bars (211), and the second torsion seat (214) being fixedly connected to the base plate (10); The first torsion spring (24) is sleeved with the first torsion rod (211), and the two ends of the first torsion spring (24) are respectively in contact with the first torsion plate (212) and the first torsion seat (213); the torsion arm (22) is respectively in rotational contact with the first torsion seat (213) and the third torsion seat (215), and the torsion gear (23) is rotationally connected between the second torsion seat (214) and the third torsion seat (215).

4. The folding screen hinge mechanism according to claim 3, characterized in that: A second torsion rod (216) is provided between the first torsion plate (212) and the first torsion seat (213) and is arranged parallel to the first torsion rod (211). A second torsion spring (25) is sleeved on the second torsion rod (216). One end of the second torsion rod (216) is fixedly connected to the first torsion plate (212), and the first torsion seat (213) is movably connected to the other end of the second torsion rod (216).

5. The folding screen hinge mechanism according to claim 3 or 4, characterized in that: A plurality of first protrusions (2131) are provided at both ends of the first torque seat (213); a plurality of second protrusions (223) are provided at one end of the torque arm (22) close to the first torque seat (213); the second protrusions (223) are in contact with the first protrusions (2131); and the first protrusions (2131) and the second protrusions (223) are alternately distributed along the circumference of the first torsion bar (211); A plurality of third protrusions (2151) are provided at both ends of the third torque seat (215), and a plurality of fourth protrusions (224) are provided at one end of the torque arm (22) close to the third torque seat (215), wherein the fourth protrusions (224) are in contact with the third protrusions (2151), and the fourth protrusions (224) and the third protrusions (2151) are alternately distributed along the circumference of the first torsion bar (211).

6. The folding screen hinge mechanism according to claim 5, characterized in that: The first convex block (2131) is provided with two first torsion inclined surfaces (2132) arranged at an angle, and the second convex block (223) is provided with two second torsion inclined surfaces (2231) arranged at an angle and corresponding to the first torsion inclined surfaces (2132); The third convex block (2151) is provided with two third torsion inclined surfaces (2152) arranged at an angle, and the fourth convex block (224) is provided with two fourth torsion inclined surfaces (2241) arranged at an angle and corresponding to the third torsion inclined surfaces (2152).

7. The folding screen hinge mechanism according to claim 6, characterized in that: The torque arm (22) is provided with a rotation groove (225) located between the second protrusion (223) and the fourth protrusion (224), and the end of the second torque seat (214) is embedded in the rotation groove (225); The torque arm (22) is provided with a rotating portion (226) located in the rotating groove (225); the second torque seat (214) is provided with a limiting portion (2141) that is matched with the rotating portion (226); the limiting portion (2141) is provided with a first limiting surface (2142), a second limiting surface (2143) and a third limiting surface (2144) that are connected in sequence; the first limiting surface (2142) and the third limiting surface (2144) are both used for limiting contact with the rotating portion (226); the second limiting surface (2143) is an arc surface and is in contact with the first torsion bar (211).

8. The folding screen hinge mechanism according to claim 7, characterized in that: A second torsion plate (217) is provided on one side of the first torsion plate (212) relative to the first torsion spring (24); a first mounting groove (2111) is provided on the first torsion rod (211); and a second mounting groove (2171) is provided on the second torsion plate (217) that is inserted and matched with the first mounting groove (2111); An integrally formed plug post (2172) is provided on the second torsion plate (217), and a socket (2121) that is plugged into and matched with the plug post (2172) is provided on the first torsion plate (212).

9. The folding screen hinge mechanism according to claim 1, characterized in that: The base plate (10) is provided with an integrally formed positioning column (12), the cover plate (32) is provided with a positioning hole (322) plugged into and mated with the positioning column (12), the four sides of the cover plate (32) are fixedly connected to the base plate (10) via a first fastening screw (34), and the middle of the cover plate (32) is fixedly connected to the base plate (10) via a second fastening screw (35); The cover plate (32) is provided with two first abutting portions (323) and two second abutting portions (324); the first abutting portions (323) and the second abutting portions (324) correspond one to one and enclose the opening (321); the two first abutting portions (323) are symmetrically arranged, and the two second abutting portions (324) are symmetrically arranged.

10. A foldable electronic device, characterized in that: Comprising a foldable first folding screen (100), a second folding screen (200) and a third folding screen (300), wherein a folding screen hinge mechanism according to any one of claims 1 to 9 is connected between the first folding screen (100) and the second folding screen (200) and between the second folding screen (200) and the third folding screen (300); The third folding screen (300) is folded and overlapped on the second folding screen (200), and the first folding screen (100) is folded and overlapped on the third folding screen (300); the first folding screen (100) and the third folding screen (300) are both arranged in a wedge shape.

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