Folding connection structure and splicing display screen

Abstract

This utility model discloses a folding connection structure and a splicing display screen. The folding connection structure effectively solves the problem of insufficient strength in existing folding connection structures by adopting a symmetrical multi-link linkage structure with a central axis as the core. It uses two sets of hinge components arranged symmetrically along the axis of rotational symmetry. Each hinge component includes an inner hinge body with a first arm and a second arm, and an outer hinge body hinged to it. It achieves linkage connection with adjacent sub-display screens through a base structure. When unfolded, when the two sub-display screens move to their coplanar limit positions, the first arms on both sides rigidly abut against the limiting stop, forming a triangular stable support structure with multi-point force. This not only achieves mechanical self-locking and eliminates structural gaps, but also distributes the weight of the display screen and external loads to the central axis and the two hinge components through the multi-arm body, significantly improving the overall stiffness and torsional resistance of the connection area.

Description

Technical Field

[0001] This utility model relates to the field of display device technology, and in particular to a folding connection structure and a splicing display screen. Background Technology

[0002] With the development of display technology, large-size splicing displays have been widely used in exhibitions, conference centers, and commercial advertising due to their scalability and high visual impact. To meet the needs of flexible deployment and transportation of equipment in different venues, in recent years, a structural solution has emerged that designs adjacent sub-displays as relatively foldable structures to significantly reduce the overall size of the equipment and lower packaging and logistics costs.

[0003] However, most folding structures use single-point or simple double-hinge connections, resulting in a limited number of connection points and insufficient overall structural rigidity. When the display is unfolded and in operation, the weight of each sub-display generates continuous bending and torque moments in the connection area. The weak connection structure struggles to effectively resist these loads, making it prone to elastic or even plastic deformation. Secondly, the limiting mechanisms of existing folding structures mostly rely on flexible buffers or hard contacts with gap fits, lacking precise and rigid mechanical locking. When the display is unfolded to a flat state, the connection structure still has slight degrees of freedom of movement. Under external vibration or long-term use, cumulative displacement can easily occur, leading to visible steps or gaps between adjacent sub-displays, severely affecting the integrity and visual consistency of the displayed image. Therefore, how to provide a folding connection structure with high structural strength, high rigidity, and high stability in the unfolded state has become a pressing technical challenge in this field. Utility Model Content

[0004] The present invention provides a folding connection structure and a splicing display screen, which aims to solve the technical problem of insufficient strength of the folding connection structure between the sub-display screens in the existing splicing display screen.

[0005] In a first aspect, this utility model provides a folding connection structure, defining a symmetry axis. The folding connection structure includes: a central axis, the symmetry axis extending radially along the midpoint of the central axis; a hinge assembly rotatably disposed on the central axis, with two hinge assemblies rotate symmetrically arranged along the symmetry axis; each hinge assembly includes: an inner hinge body rotatably connected to the central axis, on which a first arm and a second arm are provided, the first and second arms extending radially along the central axis; an outer hinge body including a limiting stop and a base connecting part, the limiting stop and the second arm being rotatably connected; and a base structure including a mounting surface parallel to the axis of the central axis, the base structure being rotatably connected to the first arm of another hinge assembly, and the base structure being rotatably connected to the base connecting part. The mounting surface is used to connect to a sub-display screen and is parallel to the visible surface of the display screen; wherein, when the two mounting surfaces move away from each other to their extreme positions, the first arms belonging to the two hinge assemblies abut against the limiting stop.

[0006] In the folding connection structure provided by this utility model, the base structure also includes a support surface adjacent to the mounting surface. When the mounting surfaces move close to each other to the limit position, the two support surfaces belonging to the two hinge components abut against each other.

[0007] The folding connection structure provided by this utility model further includes a first rotating shaft, a second rotating shaft, and a third rotating shaft arranged in the same direction as the central shaft. The limiting stop and the second arm are rotatably connected through the first rotating shaft. The base structure is rotatably connected to the first arm of another hinge assembly through the second rotating shaft. The base structure is rotatably connected to the base connecting part through the third rotating shaft.

[0008] In the folding connection structure provided by this utility model, the first arm body is provided with a convex curved surface, the limiting stop part is provided with a concave curved surface, the convex curved surface and the concave curved surface in another hinge component are arranged facing each other, and when the two mounting surfaces move away from each other to the limit position, the convex curved surface and the concave curved surface in another hinge component embrace and abut.

[0009] In the folding connection structure provided by this utility model, the concave curved surface is disposed near the base connection portion.

[0010] In the folding connection structure provided by this utility model, the limiting stop part is provided with a first auxiliary protrusion on the side away from the base connection part, and the first arm body is provided with a second auxiliary protrusion. The second auxiliary protrusion is located between the concave curved surface and the central axis. When the two mounting surfaces move away from each other to the limit position, the first auxiliary protrusion and the second auxiliary protrusion of the other hinge assembly approach each other.

[0011] In the folding connection structure provided by this utility model, the third rotating shaft is closer to the mounting surface than the second rotating shaft.

[0012] In the folding connection structure provided by this utility model, the outer hinge body is also provided with a recessed avoidance portion. The recessed avoidance portion is formed from the limiting stop portion toward the base connection portion. When the mounting surfaces move close to each other to the limit position, the second arm body is located in the recessed avoidance portion.

[0013] In the folding connection structure provided by this utility model, when the two mounting surfaces move away from each other to their extreme positions, and when the mounting surfaces move closer to each other to their extreme positions, the two mounting surfaces belonging to the two hinge components are parallel to each other.

[0014] Secondly, this utility model also provides a splicing display screen, characterized in that it includes the folding connection structure described above.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] In the technical solution of this utility model, the folding connection structure effectively solves the problem of insufficient strength in existing folding connection structures by adopting a symmetrical multi-link linkage structure with a central axis as the core. It uses two sets of hinge components symmetrically arranged along the axis of rotational symmetry. Each hinge component includes an inner hinge body with a first arm and a second arm, and an outer hinge body hinged to it. It achieves linkage connection with adjacent sub-display screens through a base structure. During unfolding, when the two sub-display screens move to their coplanar limit positions, the first arms on both sides rigidly abut against the limiting stop, forming a triangular stable support structure with multi-point force. This not only achieves mechanical self-locking and eliminates structural gaps, but also distributes the weight of the display screens and external loads to the central axis and the two hinge components through the multi-arm bodies, significantly improving the overall stiffness and torsional resistance of the connection area. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the folding connection structure of this utility model in the folded storage state of the sub-display screen;

[0019] Figure 2This is a schematic diagram of the front and oblique sides of the folding connection structure in the unfolded and aligned state of the sub-display screen, according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the anti-slanted two-sided structure of the folding connection structure in the unfolded and aligned state of the sub-display screen, according to an embodiment of the present utility model.

[0021] Figure 4 This is a front view of the folding connection structure of this utility model embodiment in the unfolded and aligned state of the sub-display screen;

[0022] Figure 5 This is a cross-sectional schematic diagram of the folding connection structure of this utility model in the unfolded and aligned state of the sub-display screen;

[0023] Figure 6 This is a cross-sectional schematic diagram of the folding connection structure of this utility model in the folded storage state of the sub-display screen;

[0024] Figure 7 This is an exploded view of the structure of each pin of the folding connection structure in the folded storage state of the sub-display screen according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the inner hinge body's front and oblique sides of the folding connection structure according to an embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the inner hinge body anti-oblique two-sided structure of the folding connection structure according to an embodiment of the present utility model;

[0027] Figure 10 This is a schematic diagram of the front and oblique sides of the outer hinge body of the folding connection structure according to an embodiment of the present utility model;

[0028] Figure 11 This is a schematic diagram of the reverse oblique two sides of the outer hinge body of the folding connection structure according to an embodiment of the present utility model;

[0029] Figure 12 This is a top view of the splicing display screen in its unfolded and used state according to an embodiment of the present utility model;

[0030] Figure 13 This is a top view of the splicing display screen in the transition state between unfolded use and folded storage according to an embodiment of the present utility model;

[0031] Figure 14 This is a top view of the splicing display screen in a folded and stored state according to an embodiment of the present invention;

[0032] Figure 15 This is a front view of the splicing display screen in its unfolded and used state according to an embodiment of the present utility model;

[0033] Figure 16 This is a front view of the splicing display screen in a folded and stored state according to an embodiment of the present invention;

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Folding connection structure; 11. First pivot; 12. Second pivot; 13. Third pivot;

[0036] 20. Hinge assembly; 21. Central shaft;

[0037] 30. Inner hinge body; 31. First arm body; 311. Convex curved surface; 312. Second auxiliary protrusion; 32. Second arm body;

[0038] 40. External hinge body; 41. Limiting and stopping part; 411. Concave curved surface; 412. First auxiliary protrusion; 42. Base connecting part; 43. Alignment recess;

[0039] 50. Base structure; 51. Mounting surface; 52. Supporting surface;

[0040] 60. Sub-display screen; 61. Visible surface. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] This invention addresses the technical problem of insufficient strength in the folding connection structure between sub-displays of a splicing display screen in existing technologies. A folding connection structure 10 is proposed. (Refer to...) Figures 1 to 11For ease of explanation, a symmetry axis is defined on the folding connection structure 10. The folding connection structure 10 includes: a central axis 21, the symmetry axis extending radially along the midpoint of the axis of the central axis 21; and hinge components 20 rotatably disposed on the central axis 21, with two hinge components 20 arranged symmetrically about the symmetry axis. Each hinge component 20 includes: an inner hinge body 30 rotatably connected to the central axis 21, on which a first arm body 31 and a second arm body 32 are provided, the first arm body 31 and the second arm body 32 extending radially along the central axis 21; and an outer hinge body 40, including a limiting stop part 41 and a base. The connecting part 42 is rotatably connected to the limiting stop part 41 and the second arm 32; the base structure 50 includes a mounting surface 51, which is parallel to the axis of the central shaft 21. The base structure 50 is rotatably connected to the first arm 31 of another hinge assembly 20. The base structure 50 is rotatably connected to the base connecting part 42. The mounting surface 51 is used to connect the sub-display screen 60 and is parallel to the visible surface 61 of the display screen. When the two mounting surfaces 51 move away from each other to their extreme positions, the first arm 31 belonging to the two hinge assemblies 20 abuts against the limiting stop part 41.

[0044] The folding connection structure 10 is used to achieve a foldable connection between two adjacent sub-display screens 60 in a large-size splicing display screen, to adapt to changes in the size of the equipment during transportation and deployment. For ease of structural description, the structure is defined by a rotational symmetry axis, and the overall layout is a mirror image distribution with rotational symmetry around this axis, ensuring balanced force on both sides. The core of the folding connection structure 10 is a central axis 21, which serves as the rotational reference for the entire mechanism. Its axis runs through the middle of the structure, and the rotational symmetry axis extends radially along the midpoint of the central axis 21, used to determine the symmetrical arrangement of the two sets of hinge components 20. The two sets of hinge components 20 are rotatably mounted on the central axis 21 and are arranged symmetrically left and right along the rotational symmetry axis, thereby maintaining synchronization and stability during movement.

[0045] Each hinge assembly 20 includes an inner hinge body 30, which is rotatably connected to the central shaft 21 via a bearing or bushing structure, allowing it to rotate around the central shaft 21. The inner hinge body 30 has an integrally formed first arm 31 and a second arm 32, both extending outwards along the radial direction of the central shaft 21, forming the active transmission arm in the multi-link mechanism. The first arm 31 is used to form a linkage connection with the base structure 50 of the opposite hinge assembly 20, while the second arm 32 forms a rotating pair with the limiting stop 41 in the outer hinge body 40 via a pin, realizing force transmission and motion guidance. The outer hinge body 40 includes a limiting stop 41 and a base connection 42. The limiting stop 41 is structurally designed as a boss or block with a certain thickness, used to provide a rigid support surface 52 when in the extended limit position. The base connection part 42 serves as a connection structure with the base structure 50, and has a certain thickness to ensure structural strength.

[0046] The base structure 50 is a load-bearing component directly connected to the sub-display screen 60. It has a mounting surface 51 for mounting the sub-display screen 60. This mounting surface 51 is structurally parallel to the axis of the central shaft 21 and, in its final unfolded state, parallel to the visible surface 61 of the sub-display screen 60 to ensure the flatness of the display surface. The base structure 50 is coupled to the entire hinge system through two rotating connection points. One is a cross-linking structure formed with the first arm 31 of the opposite hinge assembly 20 via a first rotating shaft 11; the other is a hinged connection with the base connection part 42 of the external hinge body 40 on this side via a second rotating shaft 12, thereby connecting multiple moving components into a complete multi-link mechanism. When the two sub-display screens 60 move from a folded state to an unfolded state, the two sets of hinge assemblies 20 move synchronously, and the base structure 50 drives the mounting surface 51 to gradually move away until it reaches its fully flattened limit position. At this extreme position, the first arm 31, belonging to the two sets of hinge components 20, moves to its limit stroke, and its end rigidly abuts against the limiting stop 41 on the opposite side, forming a mechanical hard limit. This abutment relationship transforms the entire connection structure from a movable mechanism into a stable triangular support system, effectively transferring and distributing the gravitational load from the sub-display screen 60, and preventing sagging, torsion, or step-off phenomena caused by structural flexibility or gaps. To ensure that the user's frontal viewing effect is seamless and without steps when the sub-display screens 60 are flattened and used in the entire splicing screen, avoiding a sense of discontinuity, the mounting surface 51 needs to be installed on the machined surface of the back shell of the sub-display screen 60, rather than on the molded surface of the back shell of the directly molded sub-display screen 60.

[0047] To enhance structural strength and durability, the inner hinge 30, outer hinge 40, and central shaft 21 can be made of high-strength aluminum alloy through die casting or precision machining to ensure dimensional accuracy and mechanical properties. The pins at each rotating connection can be made of free-cutting steel and surface-hardened to guarantee a lifespan exceeding 100,000 repeated folding cycles. Furthermore, the connection area between the base structure 50 and the sub-display screen 60 uses a precision-machined flat surface to ensure high flatness of the mounting reference, further improving the overall flatness and consistency of the splicing surface.

[0048] In the technical solution of this utility model, the folding connection structure 10 effectively solves the problem of insufficient strength of the existing folding connection structure 10 by adopting a symmetrical multi-link linkage structure with the central axis 21 as the core. It uses two sets of hinge components 20 arranged symmetrically along the axis of rotational symmetry. Each hinge component 20 includes an inner hinge body 30 with a first arm 31 and a second arm 32, and an outer hinge body 40 hinged thereto. It achieves linkage connection with adjacent sub-display screens 60 through the base structure 50. During unfolding, when the two sub-display screens 60 move to their coplanar limit positions, the first arm bodies 31 on both sides rigidly abut against the limiting stop parts 41, forming a triangular stable support structure with multi-point force. This not only achieves mechanical self-locking and eliminates structural gaps, but also distributes the weight of the display screen and external loads to the central axis 21 and the two hinge components 20 through the multi-arm bodies, significantly improving the overall rigidity and torsional resistance of the connection area.

[0049] In one embodiment, reference is made to Figures 1 to 11The base structure 50 also includes a support surface 52 adjacent to the mounting surface 51. When the mounting surfaces 51 move closer to each other to their limit positions, the two support surfaces 52 belonging to the two hinge components 20 abut against each other. Each base structure 50 includes a support surface 52, which is adjacent to the mounting surface 51 used to connect the sub-displays 60 and located in the side or end region of the base structure 50. During the operation of the folding connection structure 10, when the two sub-displays 60 move from the unfolded state to the folded state, the two sets of hinge components 20 rotate synchronously under the drive of the central shaft 21, and the base structure 50 undergoes relative displacement accordingly, with the mounting surfaces 51 on it gradually approaching each other. When the folding action reaches its limit position, that is, when the two sub-displays 60 are completely folded forward and fit together, the support surfaces 52 on the base structures 50 belonging to the two hinge components 20 contact each other and rigidly abut against each other. The design of this support surface 52 not only limits the final folding angle but also provides an additional load-bearing support point for the connection structure in the folded state. The contact of the support surface 52 effectively disperses the concentrated stress between components during folding, preventing mechanical damage to internal connecting rods or hinge points due to excessive rotation, while also enhancing the compactness and stability of the overall structure after folding. The support surface 52 is preferably a planar structure and is manufactured integrally with the base structure 50 to ensure its structural strength and positional accuracy. In practical applications, the support surface 52 also cooperates with the limiting structure of the external packaging material, allowing the folded splicing screen to be securely embedded in the transport box, preventing shaking or accidental unfolding during transportation, further improving the safety and portability of the equipment. Furthermore, buffer pads or wear-resistant coatings are provided in the contact area of ​​the two support surfaces 52 to reduce wear caused by repeated contact and extend the service life of the structure.

[0050] In one embodiment, reference is made to Figures 1 to 11It also includes a first rotating shaft 11, a second rotating shaft 12, and a third rotating shaft 13 arranged coaxially with the central shaft 21. The limiting stop part 41 and the second arm 32 are rotatably connected through the first rotating shaft 11. The base structure 50 is rotatably connected to the first arm 31 of another hinge assembly 20 through the second rotating shaft 12. The base structure 50 and the base connecting part 42 are rotatably connected through the third rotating shaft 13. The first rotating shaft 11 is used to realize the rotational connection between the limiting stop part 41 on the outer hinge body 40 and the second arm 32 on the inner hinge body 30. As the hinge shaft of this rotating pair, its two ends are respectively fixed in the ear structure of the limiting stop part 41. The second arm 32 is sleeved on the first rotating shaft 11 through the through hole, thereby allowing the second arm 32 to rotate relative to the first rotating shaft 11, realizing the motion transmission of the linkage mechanism. The second pivot 12 connects the base structure 50 on this side with the first arm 31 in the hinge assembly 20 on the opposite side. This connection is a key component of the cross-linking structure. When the first arm 31 on one side rotates with the inner hinge 30, the second pivot 12 pushes the base structure 50 on the opposite side to move synchronously, ensuring that the two sub-display screens 60 remain coordinated during unfolding and folding. The third pivot 13 is used to realize the rotational connection between the base structure 50 and the base connection part 42 of the outer hinge 40 on this side. The base connection part 42 is provided with a shaft hole, and the base structure 50 is provided with a corresponding shaft hole. The third pivot 13 passes through it, forming a stable hinge fulcrum, allowing the base structure 50 to swing smoothly around the axis. All three pivots are arranged parallel to each other along the same axial direction as the central axis 21 and are spatially staggered to avoid interference. Their axes are parallel to each other and together form the motion skeleton of the multi-link mechanism. Each shaft can be made of metal, such as free-cutting steel, to form cylindrical pins or stepped shaft structures, and fixed to the corresponding components by pressing, locking with nuts, or limiting with snap rings to ensure connection reliability under long-term and frequent folding. To improve rotational smoothness and wear resistance, copper sleeves or self-lubricating bearings can be installed between each shaft and the connecting hole.

[0051] In one embodiment, reference is made to Figures 1 to 11 The first arm body 31 is provided with a convex curved surface 311, and the limiting stop part 41 is provided with a concave curved surface 411. The convex curved surface 311 and the concave curved surface 411 in the other hinge assembly 20 are arranged facing each other. When the two mounting surfaces 51 move away from each other to the limit position, the convex curved surface 311 and the concave curved surface 411 in the other hinge assembly 20 embrace and abut.

[0052] The end of the first arm 31 is provided with an outwardly protruding convex surface 311, which extends along the movement trajectory of the first arm 31 to form an arc-shaped protrusion structure. Correspondingly, the limiting stop portion 41 of the opposite hinge assembly 20 is provided with a concave surface 411 that matches the convex surface 311. The concave surface 411 is concave and its curvature is adapted to match the convex surface 311. The two are arranged facing each other to form a pair of mating curved surface limiting pairs. When the two sub-display screens 60 move from the folded state to the unfolded state, with the linkage of the hinge assembly 20, the first arm 31 drives the convex surface 311 to swing outward along an arc path until it reaches the limit position of being completely flattened. At this position, the convex surface 311 on this side of the first arm 31 and the concave surface 411 on the opposite side of the limiting stop portion 41 achieve a hugging and abutting contact, that is, the convex surface 311 is embedded in the concave surface 411, forming a surface contact type rigid limiting fit. Compared to traditional point or line contact limiting methods, this curved surface engagement structure significantly increases the contact area, effectively dispersing contact stress generated during the limiting moment and long-term load-bearing process, preventing material deformation or wear caused by local stress concentration, thereby improving the durability and stability of the structure. Simultaneously, the curved surface engagement has a certain self-aligning guiding function, guiding the component to automatically adjust to the optimal limiting posture when approaching the flattened position, ensuring accurate positioning each time it unfolds, and avoiding insufficient limiting due to assembly errors or minor deformations. The curvature centers of the convex surface 311 and the concave surface 411 are preferably located near the axis of the central axis 21, so that their motion trajectory is consistent with the overall rotation path, ensuring a reasonable force transmission direction and further enhancing the overall rigidity of the structure. In actual manufacturing, the convex surface 311 and the concave surface 411 can be obtained by precision machining or molding the inner hinge body 30 and the outer hinge body 40. The contact area between the convex curved surface 311 and the concave curved surface 411 is reinforced with a surface treatment such as electroplating or spraying a wear-resistant coating, or an elastic buffer layer is provided at the bottom of the concave curved surface 411 to absorb the impact energy when it is deployed into place, reduce motion noise, and improve the user experience.

[0053] In one embodiment, reference is made to Figures 1 to 11The concave surface 411 is located near the base connection portion 42. The concave surface 411 on the limiting stop portion 41 is located near the end that connects to the base structure 50, i.e., near the base connection portion 42. This arrangement is to consider the force transmission path and structural stability requirements of the entire hinge assembly 20 in the unfolded state. When the sub-display screen 60 is unfolded to its limit position, the outer hinge body 40 not only bears the tensile or compressive load from the base structure 50 through the base connection portion 42, but also needs to bear the reaction force transmitted from the first arm 31 on the opposite side through the convex surface 311 at the moment of limiting. By placing the concave surface 411 near the base connection portion 42, the point of application of the limiting force is closer to the connection fulcrum between the outer hinge body 40 and the base structure 50, thereby significantly shortening the lever arm length, reducing the bending moment acting on the outer hinge body 40, and avoiding structural bending deformation or stress concentration caused by excessive lever arm length. Meanwhile, this layout allows the limiting reaction force to be transmitted more directly to the base structure 50 through the base connection part 42, and further to the cabinet structure of the sub-display 60, forming a short and efficient force transmission path, thus improving the rigidity and torsional resistance of the entire connection area. Furthermore, since the base connection part 42 itself is a relatively thick and strong area on the outer hinge body 40, placing the concave curved surface 411 here can fully utilize the material strength and structural stability of this area, ensuring that the limiting structure maintains its shape accuracy and functional reliability under long-term repeated stress. In actual assembly, the concave curved surface 411 and the base connection part 42 can be integrally formed on the outer hinge body 40, avoiding additional connection interfaces and further improving the overall structural integrity. As an optional extended design, reinforcing ribs or locally thickened structures can be added to the transition area between the concave curved surface 411 and the base connection part 42 to further enhance the mechanical strength of this critical stress area.

[0054] In one embodiment, reference is made to Figures 1 to 11 The limiting stop part 41 is provided with a first auxiliary protrusion 412 on the side away from the base connection part 42, and the first arm body 31 is provided with a second auxiliary protrusion 312. The second auxiliary protrusion 312 is located between the concave curved surface 411 and the central axis 21. When the two mounting surfaces 51 move away from each other to the limit position, the first auxiliary protrusion 412 and the second auxiliary protrusion 312 of the other hinge assembly 20 approach each other.

[0055] The limiting stop part 41 has a first auxiliary protrusion 412 on its side away from the base connection part 42. The first auxiliary protrusion 412 extends outward from the end or side of the limiting stop part 41 to form a protruding structure. Correspondingly, a second auxiliary protrusion 312 is provided on the first arm 31 of the opposite hinge assembly 20. The second auxiliary protrusion 312 is located in the arm area between the concave curved surface 411 and the central axis 21, that is, a section near the inner hinge body 30. When the two sub-displays 60 move from the folded state to the unfolded state and approach the limit position of being completely flattened, as the first arm 31 drives the convex curved surface 311 to gradually approach and finally achieve a hugging and abutting with the opposite concave curved surface 411, the first auxiliary protrusion 412 on this side and the second auxiliary protrusion 312 on the opposite side also approach synchronously. When the structure is fully deployed, the first auxiliary protrusion 412 and the second auxiliary protrusion 312, belonging to the two hinge components 20, approach each other but do not fully contact, or are designed to make slight contact, forming a pair of spatially corresponding auxiliary limiting pairs. The pair of auxiliary protrusions serves a dual purpose: firstly, as an auxiliary guide and anti-over-rotation structure for deployment, when the first arm 31 moves to its limit angle, the approach or slight contact of the two auxiliary protrusions can effectively prevent the mechanism from undergoing slight over-rotation or rebound due to inertia or external forces, thereby ensuring that it can stably stop at the preset coplanar position each time it is deployed; secondly, the pair of auxiliary protrusions form a lateral constraint in the structure, enhancing the torsional stiffness of the connecting components in the direction perpendicular to the plane of rotation, effectively suppressing lateral swaying caused by external vibration or uneven force, and further improving the overall structural stability of the splicing screen after deployment. The opposing surfaces of the first auxiliary protrusion 412 and the second auxiliary protrusion 312 are provided with elastic buffer pads or magnetic adsorption structures. The former can absorb energy and reduce noise when a slight collision occurs, while the latter can generate pre-tightening force when approaching, thus assisting in achieving the self-alignment function.

[0056] In one embodiment, reference is made to Figures 1 to 11The third pivot 13 is closer to the mounting surface 51 than the second pivot 12. The third pivot 13 is positioned closer to the mounting surface 51 than the second pivot 12, meaning it is closer to the mounting position of the sub-display screen 60. This layout design fully considers the stress characteristics and structural deformation control requirements of the base structure 50 in its unfolded state. When the sub-display screen 60 is unfolded and in operation, its own weight is transmitted to the base structure 50 through the mounting surface 51, forming a downward bending moment on the base structure 50. Positioning the third pivot 13 closer to the mounting surface 51 means that this critical connection point is closer to the center of load application, effectively shortening the lever arm of the gravity load on the third pivot 13, significantly reducing the bending stress acting on this connection point, and improving the stability and fatigue resistance of the connection. Meanwhile, this layout allows the base structure 50 to receive more direct support on the side closer to the display screen, enhancing the local rigidity of the installation area and helping to prevent the mounting surface 51 from sagging or twisting due to the cantilever effect, thereby ensuring the coplanarity and flatness of the splicing surfaces between adjacent sub-display screens 60. In contrast, the second pivot 12, as the linkage connection point with the first arm 31 on the opposite side, can be appropriately arranged at a position slightly further away from the mounting surface 51 to adapt to the motion trajectory requirements of the multi-link mechanism and ensure the smoothness of the folding and unfolding process. The arrangement of the third pivot 13 close to the mounting surface 51, together with the central shaft 21, the multi-arm body, and the limiting structure, constitutes a mechanical system with reasonable force distribution and optimized rigidity distribution. This allows external loads to be quickly transmitted to the outer hinge body 40 through the third pivot 13, and then distributed to the entire hinge assembly 20 through the abutment structure between the limiting stop part 41 and the first arm body 31, ultimately borne by the central shaft 21, forming an efficient and stable force transmission path.

[0057] In one embodiment, reference is made to Figures 1 to 11 The outer hinge body 40 is also provided with a clearance recess 43. The clearance recess 43 is formed by recessing from the limiting stop part 41 toward the base connection part 42. When the mounting surfaces 51 move close to each other to the limit position, the second arm body 32 is located in the clearance recess 43.

[0058] The recessed portion 43 is formed by recessing into the body of the outer hinge 40 from the limiting stop portion 41 toward the base connection portion 42, constituting a partially sunken or hollowed-out structural area. When the two sub-display screens 60 rotate from the unfolded state to the folded state, the inner hinge 30 drives the second arm 32 on it to rotate synchronously around the central axis 21, and its movement trajectory is arc-shaped. As the folding angle increases, the second arm 32 gradually moves closer to the outer hinge 40 on its side. When the folding action reaches the limit position, that is, when the two sub-display screens 60 are completely folded forward and fit together, the second arm 32 moves exactly to the area directly opposite the recessed portion 43 and extends partially or completely into the recessed space, achieving embedded accommodation in the structure. The design of the recessed portion 43 effectively solves the problem of physical interference that may occur between the second arm 32 and the body of the outer hinge 40 during large-angle folding, ensuring the smooth completion of the folding action and avoiding jamming, deformation or wear caused by structural collision. Meanwhile, by housing the second arm 32 within the recess 43, the overall volume of the entire connecting structure in the thickness direction after folding can be significantly reduced, allowing the two sub-displays 60 to fit more tightly. This further reduces the space requirements for transport packaging materials, improving the portability and packaging efficiency of the device. The shape and size of the recess 43 are designed to match the outer contour of the second arm 32 and its motion envelope. It is typically an arc-shaped or U-shaped groove that fits the outer edge of the second arm 32, ensuring sufficient safety clearance throughout the full folding process.

[0059] In one embodiment, reference is made to Figures 1 to 11 When the two mounting surfaces 51 move away from each other to their extreme positions, and when the mounting surfaces 51 move closer to each other to their extreme positions, the two mounting surfaces 51 belonging to the two hinge components 20 remain parallel to each other. That is, when the two sub-displays 60 are unfolded to their use state or folded to their storage state, the two mounting surfaces 51 belonging to the two hinge components 20 always maintain a parallel relationship. Correspondingly, the two sub-displays 60 are folded back-to-back in a combination on the same plane to maximize space utilization.

[0060] During the unfolding process, when the two mounting surfaces 51 move away from each other and reach their extreme positions, the entire hinge system, through the coordinated movement of the central shaft 21, the inner hinge body 30, the outer hinge body 40, and the base structure 50, causes the two mounting surfaces 51 to rotate synchronously and finally stop at a coplanar and flat position. At this time, the visible surfaces 61 of the two mounting surfaces 51 and each sub-display screen 60 are not only parallel to each other, but also tend to be coplanar, thereby providing a consistent installation reference for adjacent sub-display screens 60 and ensuring seamless splicing of display surfaces.

[0061] During the folding process, when the two mounting surfaces 51 move towards each other to their extreme positions, the multi-link mechanism, constrained by symmetrical arrangement and synchronous rotation, ensures that the two mounting surfaces 51 fold inward with the same angular velocity and rotational trajectory, ultimately forming a state of front-to-back stacking or lateral contact. Furthermore, at the end of the entire folding stroke, the two mounting surfaces 51 maintain a strict parallel relationship, avoiding angular deviations such as "inward folding" or "outward folding." This parallel relationship relies on the axial symmetry of the two sets of hinge components 20 along the rotational symmetry axis, the coaxiality and positional accuracy control of each axis, and the precise matching of the link length and connection point layout. For example, the length ratio of the first arm 31 to the second arm 32, and the spatial relative positions of the limiting stop 41 and the base connection 42, have all undergone kinematic simulation and structural optimization to ensure a symmetrical force transmission path and no additional torsional torque at the extreme positions. In addition, the central axis 21, serving as the rotational reference for the entire mechanism, further ensures the synchronicity of the movements on both sides through its straightness and installation stability. In addition, in practical use, when unfolded, the parallel and coplanar mounting surfaces 51 can effectively prevent step differences or gaps between the displays; when folded, the parallel and fitting mounting surfaces 51 allow the entire device to be compactly and evenly packaged in the transport packaging, avoiding structural damage caused by local protrusions or uneven stress.

[0062] This utility model also provides a splicing display screen, see reference. Figures 12 to 16 The splicing display screen includes multiple detachable or fixedly connected sub-display screens 60, wherein at least two adjacent sub-display screens 60 are rotatably connected by a folding connection structure 10 as described in any of the above embodiments. The folding connection structure 10 is disposed between the side frames of adjacent sub-display screens 60, and its two ends of the mounting surface 51 are respectively fixedly connected to the back plate or cabinet structure of the corresponding sub-display screen 60, for example, by bolting it into the preset mounting holes on the back plate of the sub-display screen 60, to ensure the firmness and positional accuracy of the connection.

[0063] In practical applications, each sub-display 60 is an independent display module with a complete driving circuit, power interface, and display panel. Its shape is typically rectangular, facilitating regular arrangement in rows or columns. When the spliced ​​display is used in exhibitions, conferences, or other scenarios requiring frequent movement, the user can manually or with an auxiliary driving device operate the folding connection structure 10 to rotate adjacent sub-displays 60 relative to each other around the central axis 21. In the unfolded state, the visible surfaces 61 of the two sub-displays 60 are coplanar and seamlessly spliced. The folding connection structure 10 forms a rigid support through the abutment of the first arm 31 and the limiting stop 41, the curved surface engagement, and the synergistic effect of the auxiliary protrusions, ensuring a flat and level display surface. In the folded state, the two sub-displays 60 flip forward and fit together. The recessed portion 43 in the folding connection structure 10 accommodates the second arm 32, and the support surface 52 provides limiting. The overall structure is compact, significantly reducing the projected area of ​​the equipment in the transportation direction.

[0064] This splicing display screen can be composed of multiple sub-display screens 60 arranged in rows and columns, such as a 5×5 array of 135-inch displays. The aforementioned folding connection structure 10 can be integrated between adjacent cabinets in each column or row, enabling segmented folding or single-sided folding of the entire screen, greatly improving the convenience of transportation and storage. To enhance the overall stability after unfolding, detachable connecting pieces can be added to the back of the multiple folding connection structures 10. Screws can be used to further tighten and lock the back panels of adjacent sub-display screens 60, forming multiple layers of fixation. Furthermore, strong magnetic components can be embedded at the mating edges of adjacent sub-display screens 60, automatically attracting them when near the flattened position, helping to eliminate tiny gaps and improving the visual integration effect. Signal and power cables can be connected through pre-reserved wiring channels inside the folding connection structure 10 or through an external flexible sheath, ensuring that the cables are not damaged by pulling during repeated folding. This splicing display screen not only solves the problems of large transportation volume and low deployment efficiency of traditional large-size display devices, but also ensures the structural strength and display quality in the unfolded state through a high-rigidity, multi-point limiting folding connection structure 10. It is suitable for various application scenarios such as mobile display, temporary broadcasting, and outdoor exhibitions, and has good practicality and market prospects.

[0065] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A folding connection structure, characterized in that, The folded connection structure is defined by having an axis of symmetry and includes: The central axis, the axis of symmetry extends radially along the midpoint of the central axis; A hinge assembly is rotatably disposed on the central axis, and the two hinge assemblies are arranged symmetrically about the axis of symmetry; The hinge assembly includes: An inner hinge body is rotatably connected to the central shaft, and a first arm and a second arm are provided thereon, the first arm and the second arm extending in the radial direction of the central shaft; The external hinge body includes a limiting stop and a base connecting part, wherein the limiting stop and the second arm are rotatably connected; A base structure includes a mounting surface parallel to the axis of the central shaft. The base structure is rotatably connected to the first arm of another hinge assembly. The base structure is rotatably connected to the base connecting portion. The mounting surface is used to connect a sub-display screen and is parallel to the visible surface of the display screen. When the two mounting surfaces move away from each other to their extreme positions, the first arm of each of the two hinge components abuts against the limiting stop.

2. The folding connection structure according to claim 1, characterized in that, The base structure also includes a support surface adjacent to the mounting surface. When the mounting surfaces move close to each other to their limit positions, the two support surfaces belonging to the two hinge components abut against each other.

3. The folding connection structure according to claim 2, characterized in that, It also includes a first rotating shaft, a second rotating shaft, and a third rotating shaft arranged in the same direction as the central shaft. The limiting stop and the second arm are rotatably connected through the first rotating shaft. The base structure is rotatably connected to the first arm of another hinge assembly through the second rotating shaft. The base structure is rotatably connected to the base connecting part through the third rotating shaft.

4. The folding connection structure according to claim 2, characterized in that, The first arm body has a convex curved surface, and the limiting stop part has a concave curved surface. The convex curved surface and the concave curved surface in another hinge assembly are arranged facing each other. When the two mounting surfaces move away from each other to the limit position, the convex curved surface and the concave curved surface in the other hinge assembly embrace and abut.

5. The folding connection structure according to claim 4, characterized in that, The concave surface is located near the base connection portion.

6. The folding connection structure according to claim 5, characterized in that, The limiting stop portion is provided with a first auxiliary protrusion on the side away from the base connection portion, and the first arm body is provided with a second auxiliary protrusion. The second auxiliary protrusion is located between the concave curved surface and the central axis. When the two mounting surfaces move away from each other to the limit position, the first auxiliary protrusion and the second auxiliary protrusion of the other hinge assembly approach each other.

7. The folding connection structure according to claim 3, characterized in that, The third rotating shaft is closer to the mounting surface than the second rotating shaft.

8. The folding connection structure according to claim 2, characterized in that, The outer hinge body is also provided with a recessed part, which is recessed from the limiting stop part toward the base connection part. When the mounting surfaces move close to each other to the limit position, the second arm body is located in the recessed part.

9. The folding connection structure according to any one of claims 1 to 8, characterized in that, When the two mounting surfaces move away from each other to their extreme positions, and when the mounting surfaces move closer to each other to their extreme positions, the two mounting surfaces belonging to the two hinge assemblies are parallel to each other.

10. A splicing display screen, characterized in that, Includes the folding connection structure as described in any one of claims 1 to 9.

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