A folding door hinge structure

Abstract

The utility model discloses a folding door hinge structure solves the problem that existing folding door hinge guide wheel integration is difficult, assembly is complex and is inconvenient to open and close. The structure includes first box body and second box body, and the first box body and the second box body are equipped with first and second mounting column for assembling guide wheel respectively, and the both ends of opening and closing spare are hinged with two box bodies respectively, so that two box bodies can be in the opening state of same straight line or the closed state of mutual parallel, and reset spare is arranged outside two box bodies and is connected with linkage spare in the box body, and reset spare provides reset force for the movement of opening and closing spare to the opening state or the closed state. This structure integrates guide wheel in hinge body, simplifies the structure, reduces assembly cost, and reset spare assists opening and closing, and the operation is smooth, and the use experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of folding door hinge technology, and in particular to a folding door hinge structure. Background Technology

[0002] Currently, folding door systems are increasingly widely used in interior partitions, cabinet doors, and other fields. The structural design of the hinge, the core component of a folding door, directly affects its performance and ease of installation. Existing folding door hinges mostly employ simple hinge structures, their main function limited to enabling rotational connections between adjacent door panels, allowing the panels to switch between open and folded states. However, this type of hinge structure has significant limitations in spatial layout, making it difficult to integrate guide wheel assemblies. This necessitates the use of additional guide rails and wheels for the sliding function of the folding door, increasing the number of components and complicating the overall structure.

[0003] However, due to the compact structure and limited internal space of traditional hinges, it is difficult to integrate guide wheel assemblies into the hinge body. This necessitates the use of additional guide rails and guide wheels for the sliding function of folding doors, increasing the number of components and complicating the overall structure. Therefore, in practical applications, guide wheels typically need to be installed independently on the door leaf or guide rail, occupying extra space and increasing assembly steps and costs. Furthermore, existing hinges lack an effective reset mechanism during opening and closing, resulting in less smooth operation of folding doors, especially in heavy-duty door applications where users need to apply considerable force to complete the opening and closing action, leading to a poor user experience. Utility Model Content

[0004] The purpose of this utility model is to disclose a folding door hinge structure that solves the problems of space limitations in the prior art, such as the inability to integrate guide wheels, complex assembly, and inconvenient opening and closing operations.

[0005] To achieve the above objectives, this utility model discloses a folding door hinge structure, comprising: a first housing, wherein the first housing is provided with a first mounting post, a guide wheel is assembled inside the first mounting post, and a first linkage member for avoiding the first mounting post is slidably disposed inside the first housing; a second housing, wherein the second housing is provided with a second mounting post, a guide wheel is assembled inside the second mounting post, and a second linkage member for avoiding the second mounting post is slidably disposed inside the second housing; an opening / closing member, comprising a first crank member and a second crank member hinged together by a hinge member, one end of the first crank member being hinged to the first housing and the other end being connected to the second linkage member; one end of the second crank member being hinged to the second housing and the other end being connected to the first linkage member, the opening / closing member being used to bring the first housing and the second housing into an open state or a closed state parallel to each other; and a reset member, wherein the reset member is respectively disposed outside the first housing and connected to the first linkage member, and disposed outside the second housing and connected to the second linkage member, for providing a reset force for the opening / closing member to move toward the open or closed state.

[0006] By adopting the above solution, the guide wheel is integrated into the hinge structure body, overcoming the problem of not being able to integrate the guide wheel due to space limitations, reducing additional parts, simplifying the overall structure, reducing assembly processes and costs, and solving the problem of complex assembly. The first and second crank components can rotate and slide flexibly, coordinating their movements to ensure that the first and second boxes are in the same straight line when open and parallel to each other when closed, achieving stable opening and closing actions. They can also share some of the force through sliding connections, reducing the force on a single hinge point, reducing wear, improving the stability and durability of the overall hinge structure, and extending its service life. The reset components are respectively located outside the first box and connected to the first linkage component, and located outside the second box and connected to the second linkage component. They can provide a reset force for the opening and closing components to move towards the open or closed state, assisting the opening and closing of the folding door, making the operation smoother, and improving the user experience.

[0007] Furthermore, the reset component includes a first spring and a first spring rod. One end of the first spring rod slides synchronously with the first linkage component. The first spring is sleeved on the first spring rod, with one end abutting against the other end of the first spring rod and the other end abutting against the first housing. The reset component also includes a second spring and a second spring rod. One end of the second spring rod slides synchronously with the second linkage component. The second spring is sleeved on the second spring rod, with one end abutting against the other end of the second spring rod and the other end abutting against the second housing.

[0008] By adopting the above solution, the spring can generate corresponding elastic deformation according to the door's movement state when the folding door is opened and closed. During the opening and closing process, the spring's elastic force can provide continuous and stable reset assistance, making the door smoother and less strenuous when open or closed, especially effective for heavy-duty door panels. At the same time, this structure can buffer the impact force during opening and closing, reduce wear between components, extend the overall service life of the hinges, and ensure accurate positioning of the door after it is fully opened or closed, thus improving the stability and reliability of the folding door.

[0009] Furthermore, the first linkage component is provided with a first clearance section corresponding to the first mounting post, and the first housing is provided with a first limiting groove for the first clearance section to slide along the length direction of the first housing; the second linkage component is provided with a second clearance section corresponding to the second mounting post, and the second housing is provided with a second limiting groove for the second clearance section to slide along the length direction of the second housing.

[0010] By adopting the above solution, when the folding door opens and closes, the movement of the crank component is transmitted to the linkage component through the hook-shaped part. The linkage component slides accordingly, ensuring that the spring lever can move synchronously, thus allowing the reset component to perform its assist function normally. The avoidance section design on the linkage component cleverly avoids the central mounting post, preventing movement interference. At the same time, the limiting groove on the housing precisely constrains the sliding trajectory of the linkage component, allowing it to move stably only in a specific direction. These designs together enable the components to be compactly and rationally arranged and cooperate within a limited space, ensuring smooth opening and closing while improving the stability and reliability of the overall structure.

[0011] Furthermore, one end of the first linkage member is bent to form a first rod connecting plate, which is connected to the first spring rod; one end of the second linkage member is bent to form a second rod connecting plate, which is connected to the second spring rod.

[0012] By adopting the above scheme, the linkage effect between the linkage component and the reset component is effectively improved through the first rod connecting plate and the second rod connecting plate, making the force transmission more stable.

[0013] Furthermore, the other end of the first linkage component is provided with a first hook-shaped portion, which engages with the other end of the second crank component; the other end of the second linkage component is provided with a second hook-shaped portion, which engages with the other end of the first crank component.

[0014] By adopting the above solution, the hook-shaped part and the crank part are snapped together, making installation and disassembly convenient and facilitating the assembly and maintenance of the hinge. At the same time, the snap-fit ​​structure can ensure that the linkage part and the crank part are tightly matched. During the opening and closing of the folding door, the linkage part moves precisely and synchronously with the crank part, thereby allowing the reset part to play a stable role and improving the overall performance of the hinge and the reliability of the folding door.

[0015] Furthermore, the first housing is provided with a first clearance hole for accommodating the first spring rod. One end of the first spring rod extends into the first clearance hole, and the other end is provided with a first stop edge. The diameter of the first stop edge is larger than the diameter of the first clearance hole, and the first spring abuts against the first stop edge and the first clearance hole. The second housing is provided with a second clearance hole for accommodating the second spring rod. One end of the second spring rod extends into the second clearance hole, and the other end is provided with a second stop edge. The diameter of the second stop edge is larger than the diameter of the second clearance hole, and the second spring abuts against the second stop edge and the second clearance hole.

[0016] By adopting the above solution, the clearance hole provides movement space for the spring rod, ensuring that it can slide smoothly with the opening and closing action; the diameter of the stop edge is larger than the diameter of the clearance hole, which can effectively prevent the spring rod from coming out of the clearance hole and play a limiting role; the spring abuts between the stop edge and the clearance hole, which can stably exert the reset force, ensuring accurate and reliable reset when the folding door is opened and closed. At the same time, this structure is compact and reasonable, making full use of the internal space of the box and improving the stability and durability of the overall hinge structure.

[0017] Furthermore, a first waist-shaped groove is provided on the surface of the first housing along its length direction, and the other end of the second crank is slidably disposed in the first waist-shaped groove. A second waist-shaped groove is provided on the surface of the second housing along its length direction, and the other end of the first crank is slidably disposed in the second waist-shaped groove. By providing the first waist-shaped groove, the sliding stability of the other end of the second crank is further improved. Similarly, by providing the second waist-shaped groove, the sliding stability of the other end of the first crank is further improved.

[0018] Furthermore, the first mounting post is located at the center of the first housing, and the second mounting post is located at the center of the second housing.

[0019] By adopting the above solution, the force on the folding door is more evenly distributed during sliding after the guide wheels are installed. This effectively avoids problems such as jamming and shaking caused by force offset, making the sliding process smoother and more stable. At the same time, the central position optimizes the overall spatial structure of the hinge, making the distribution of each component more reasonable, improving the compactness and stability of the structure. While ensuring the normal use of the folding door, it enhances the load-bearing capacity of the hinge, extends its service life, and also improves the overall aesthetics of the folding door.

[0020] Furthermore, both the first box and the second box are formed by two semi-open shells fastened together, and a receiving cavity is formed between the two semi-open shells. A first alignment post is provided in the receiving cavity of the first box, and a second alignment post is provided in the receiving cavity of the second box.

[0021] By adopting the above solution, on the one hand, this structure facilitates processing and manufacturing, breaking down the complex whole into two relatively simple semi-open shells, reducing production difficulty and cost; on the other hand, the interlocking cavity provides a regular installation space for internal components, which is conducive to reasonable layout. Furthermore, the alignment posts inside the cavity play a precise positioning role when the two semi-open shells are interlocked, ensuring accurate assembly, improving assembly efficiency and precision, making the overall hinge structure more stable and reliable, and guaranteeing the long-term stable operation of the folding door hinge.

[0022] Furthermore, one end of the first box body is folded outward to provide a first mounting edge, and the first mounting edge is provided with at least two first screw holes; one end of the second box body is folded outward to provide a second mounting edge, and the second mounting edge is provided with at least two second screw holes.

[0023] By adopting the above solution, the outward-folding mounting edge increases the contact area with the door leaf, improving the stability of the hinge-door leaf connection. The design with at least two screw holes allows for fixing with multiple screws, further enhancing the reliability of the connection and effectively preventing loosening or detachment during use. This structure not only facilitates installation and quickly secures the hinge to the door leaf, but also ensures a stable connection between the hinge and door leaf during frequent opening and closing, extending the lifespan of the folding door.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. A first mounting post is set on the first housing and a second mounting post is set on the second housing to assemble the guide wheel, directly integrating the guide wheel into the hinge structure body. This overcomes the problem that traditional hinges cannot integrate guide wheels due to space limitations, eliminating the need to separately install guide wheels on the door leaf or guide rail, reducing the number of parts, saving space, and making the overall structure more compact and reasonable; 2. Integrating the guide wheels eliminates the need for additional components such as guide rails for installing individual guide wheels, simplifying the overall structure of the folding door system. Simultaneously, assembly eliminates the need for separate installation and adjustment of multiple independent components, reducing the complexity of the assembly process and consequently lowering assembly costs. The first housing is directly assembled with one door leaf, and the second housing is directly assembled with another adjacent door leaf. This clear assembly design ensures more accurate positioning of the hinges and door leaves, facilitating installation and improving efficiency and accuracy. 3. Reset components are respectively disposed outside the first housing and connected to the first linkage component, and disposed outside the second housing and connected to the second linkage component. These components provide a reset force to the opening and closing components during the opening and closing of the folding door, guiding them towards the open or closed state. This reset assistance mechanism makes the folding door open and close more smoothly, requiring less force from the user. Especially in heavy-duty door applications, it significantly improves the user experience. The stable reset force provided by the reset components ensures that the first and second housings are on the same straight line when open and parallel to each other when closed, achieving stable opening and closing actions. This avoids problems such as jamming and shaking caused by uneven opening and closing, improving the reliability and stability of the folding door. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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 these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the open state of an embodiment of the present utility model; Figure 2 This is a three-dimensional structural diagram of the closed state of an embodiment of the present utility model; Figure 3 This is a partial exploded structural diagram of an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure in the open state of an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure in the closed state of an embodiment of the present invention.

[0027] Explanation of key figure labels: 1. First housing; 11. First hinge hole; 12. First waist-shaped slide groove; 13. First mounting post; 14. First assembly edge; 15. First screw hole; 16. First limiting groove; 17. First alignment post; 18. First clearance hole; 2. Second housing; 21. Second hinge hole; 22. Second waist-shaped slide groove; 23. Second mounting post; 24. Second assembly edge; 25. Second screw hole; 26. Second limiting groove; 27. Second alignment post; 28. Second clearance hole; 3. Opening / closing component; 31. First crank component; 32. Second crank component; 33. Hinge component; 4. Reset component; 41. First spring; 42. First spring rod; 421. First stop; 43. Second spring; 44. Second spring rod; 441. Second stop; 45. First linkage component; 451. First clearance section; 452. First rod connecting plate; 453. First hook-shaped part; 46. Second linkage component; 461. Second clearance section; 462. Second rod connecting plate; 463. Second hook-shaped part. Detailed Implementation

[0028] 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.

[0029] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0031] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0032] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0033] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0034] Please refer to Embodiment 1 of this utility model. Figures 1 to 5 As shown in the figure, this application embodiment provides a folding door hinge structure, including a first housing 1, a second housing 2, an opening / closing component 3, and a resetting component 4. The first housing 1 is assembled with a door leaf. A first mounting post 13 is provided in the center of the first housing 1. The first mounting post 13 is used to assemble a guide wheel. A first linkage component 45 for avoiding the first mounting post 13 is slidably provided in the first housing 1. One end of the first housing 1 is folded outward to provide a first mounting edge 14. The first mounting edge 14 is provided with at least two first screw holes 15 for fixed connection with the door leaf by screws.

[0035] Similarly, the second housing 2 is assembled with another adjacent door leaf. A second mounting post 23 is provided in the center of the second housing 2. A guide wheel is mounted inside the second mounting post 23, and a second linkage member 46 is slidably disposed inside the second housing 2 to avoid the second mounting post 23. One end of the second housing 2 is folded outward to provide a second mounting edge 24, which has at least two second screw holes 25 for fixed connection with the adjacent door leaf via screws.

[0036] Preferably, the first box 1 and the second box 2 have completely identical structures and are arranged in a mirror image symmetrical arrangement.

[0037] The opening / closing component 3 includes a first crank component 31 and a second crank component 32 hinged together by a hinge component 33. One end of the first crank component 31 is hinged to the first housing 1, and the other end is connected to the second linkage component 46. One end of the second crank component 32 is hinged to the second housing 2, and the other end is connected to the first linkage component 45. The opening / closing component 3 is used to bring the first housing 1 and the second housing 2 into an open state or a closed state where they are parallel to each other. The reset component 4 is respectively disposed outside the first housing 1 and connected to the first linkage component 45, and disposed outside the second housing 2 and connected to the second linkage component 46, and is used to provide a reset force for the opening / closing component 3 to move toward the open or closed state.

[0038] In this embodiment 1, by setting a first mounting post 13 and a second mounting post 23 on the first housing 1 and the second housing 2, the guide wheel is directly integrated into the hinge structure. Furthermore, through the linkage and avoidance structure of the linkage component, the problem of traditional hinges being unable to integrate guide wheels due to space limitations is effectively solved. The setting of the reset component 4 makes the opening and closing of the folding door more effortless and smooth, making it particularly suitable for heavy-duty door applications.

[0039] In one specific embodiment, the inner walls on both sides of the first box body 1 are provided with first hinge holes 11 that are hinged to one end of the first crank member 31, and the inner walls on both sides of the second box body 2 are provided with second hinge holes 21 that are hinged to one end of the second crank member 32. The inner walls on both sides of the first box body 1 are provided with first waist-shaped sliding grooves 12 so that the other end of the second crank member 32 can slide in the first waist-shaped sliding grooves 12. The inner walls on both sides of the second box body 2 are also provided with second waist-shaped sliding grooves 22 so that the other end of the first crank member 31 can slide in the second waist-shaped sliding grooves 22.

[0040] In one specific embodiment, the reset member 4 includes a first spring 41 and a first spring rod 42. One end of the first spring rod 42 slides synchronously with the first linkage member 45. The first spring 41 is sleeved on the first spring rod 42, with one end abutting against the other end of the first spring rod 42 and the other end abutting against the first housing 1. Specifically, in this embodiment 1, the first linkage member 45 is provided with a first clearance section 451 corresponding to the first mounting post 13 to avoid interference with the first mounting post 13. The first housing 1 is provided with a first limiting groove 16 to allow the first clearance section 451 to slide along the length direction of the first housing 1. The first limiting groove 16 is formed by the inner wall of the first housing 1 and the first mounting post 13.

[0041] The reset component 4 further includes a second spring 43 and a second spring rod 44. One end of the second spring rod 44 slides synchronously with the second linkage component 46. The second spring 43 is sleeved on the second spring rod 44, with one end abutting against the other end of the second spring rod 44 and the other end abutting against the second housing 2. Specifically, in this embodiment 1, the second linkage component 46 is provided with a second clearance section 461 corresponding to the second mounting post 23 to avoid interference with the second mounting post 23. The second housing 2 is provided with a second limiting groove 26 to allow the second clearance section 461 to slide along the length direction of the second housing 2. The second limiting groove 26 is formed by the inner wall of the second housing 2 and the second mounting post 23.

[0042] To improve the connection stability of the first linkage 45 and the second linkage 46, in this embodiment 1, a first rod connecting plate 452 is formed by bending one end of the first linkage 45, and a first hook-shaped portion 453 is provided at the other end. The first rod connecting plate 452 is connected to the first spring rod 42. Specifically, the first rod connecting plate 452 is provided with a threaded sleeve for threaded connection with the end of the first spring rod 42. The first hook-shaped portion 453 is engaged with the other end of the second crank 32. A second linkage 46 is formed by bending one end of the second linkage 46 to form a second rod connecting plate 462, and a second hook-shaped portion 463 is provided at the other end. The second rod connecting plate 462 is connected to the second spring rod 44. Specifically, the second rod connecting plate 462 is provided with a threaded sleeve for threaded connection with the end of the second spring rod 44. The second hook-shaped portion 463 is engaged with the other end of the first crank 31, thereby achieving a stable transmission effect between the first linkage 45 and the second linkage 46.

[0043] In some embodiments, to facilitate the maintenance and replacement of internal parts of the first housing 1 and the second housing 2, both the first housing 1 and the second housing 2 are designed to be formed by two semi-open shells fastened together. A receiving cavity is formed between the two semi-open shells. A first alignment post 17 is provided in the receiving cavity of the first housing 1, and a second alignment post 27 is provided in the receiving cavity of the second housing, for precise positioning during fastening. Based on the above opening and closing structure, the first housing 1 is provided with a first clearance hole 18, which is formed by fastening between the two semi-open shells to avoid the first spring rod 42. One end of the first spring rod 42 extends into the first clearance hole 18, and the other end is provided with a first stop 421. The diameter of the first stop 421 is larger than the diameter of the first clearance hole 18, and the first spring 41 abuts against the first stop 421 and the first clearance hole 18. The second housing 2 is provided with a second clearance hole 28, which is also formed by fastening between the two semi-open shells to avoid the second spring rod 44. One end of the second spring rod 44 extends into the second clearance hole 28, and the other end is provided with a second stop 441. The diameter of the second stop 441 is larger than the diameter of the second clearance hole 28, and the second spring 43 abuts against the second stop 441 and the second clearance hole 28.

[0044] When the folding door is closed, the first housing 1 and the second housing 2 are aligned, and the reset member 4 is in its initial state. When the folding door needs to be opened, an external force is applied to rotate the door panels relative to each other, causing the first crank member 31 and the second crank member 32 to rotate relative to each other. Simultaneously, the other end of the first crank member 31 slides within the second housing 2, and the other end of the second crank member 32 slides within the first housing 1. During this process, the first linkage member 45 moves synchronously with the second crank member 32, compressing the first spring 41 via the first spring rod 42; at the same time, the second linkage member 46 moves synchronously with the first crank member 31, compressing the second spring 43 via the second spring rod 44. The elastic potential energy stored in the springs is released when the folding door needs to be opened, providing a reset force to assist the door panels in returning to the open state. The guide wheel is mounted on the hinge via the first mounting post 13 and the second mounting post 23, moving with the hinge and rolling in the guide rail to achieve smooth sliding of the folding door.

[0045] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A folding door hinge structure, characterized in that, include: The first box (1) is provided with a first mounting post (13), the first mounting post (13) is used to assemble guide wheels, and the first box (1) is slidably provided with a first linkage (45) for avoiding the first mounting post (13). The second box (2) is provided with a second mounting post (23), the second mounting post (23) is used to assemble guide wheels, and the second box (2) is slidably provided with a second linkage (46) for avoiding the second mounting post (23); The opening and closing component (3) includes a first crank (31) and a second crank (32) hinged together by a hinge (33). One end of the first crank (31) is hinged to the first box (1) and the other end is connected to the second linkage (46). One end of the second crank (32) is hinged to the second box (2) and the other end is connected to the first linkage (45). The opening and closing component (3) is used to make the first box (1) and the second box (2) be in an open state or in a closed state that are parallel to each other. The reset member (4) is respectively disposed outside the first box (1) and connected to the first linkage member (45), and disposed outside the second box (2) and connected to the second linkage member (46), for providing the opening and closing member (3) with a reset force to move toward the open or closed state.

2. The folding door hinge structure according to claim 1, characterized in that, The reset component (4) includes a first spring (41) and a first spring rod (42). One end of the first spring rod (42) slides synchronously with the first linkage component (45). The first spring (41) is sleeved on the first spring rod (42), and one end abuts against the other end of the first spring rod (42), while the other end abuts against the first box body (1). The reset component (4) further includes a second spring (43) and a second spring rod (44). One end of the second spring rod (44) slides synchronously with the second linkage component (46). The second spring (43) is sleeved on the second spring rod (44), and one end abuts against the other end of the second spring rod (44), while the other end abuts against the second box body (2).

3. A folding door hinge structure according to claim 2, characterized in that, The first linkage (45) is provided with a first clearance section (451) corresponding to the first mounting post (13), and the first housing (1) is provided with a first limiting groove (16) for the first clearance section (451) to slide along the length direction of the first housing (1); the second linkage (46) is provided with a second clearance section (461) corresponding to the second mounting post (23), and the second housing (2) is provided with a second limiting groove (26) for the second clearance section (461) to slide along the length direction of the second housing (2).

4. A folding door hinge structure according to claim 2, characterized in that, One end of the first linkage member (45) is bent to form a first rod connecting plate (452), and the first rod connecting plate (452) is connected to the first spring rod (42); One end of the second linkage (46) is bent to form a second rod connecting plate (462), and the second rod connecting plate (462) is connected to the second spring pull rod (44).

5. A folding door hinge structure according to claim 1, characterized in that, The first linkage (45) has a first hook-shaped part (453) at the other end, and the first hook-shaped part (453) is engaged with the other end of the second crank (32); the second linkage (46) has a second hook-shaped part (463) at the other end, and the second hook-shaped part (463) is engaged with the other end of the first crank (31).

6. A folding door hinge structure according to claim 2, characterized in that, The first box body (1) is provided with a first clearance hole (18), which is used to avoid the first spring rod (42). One end of the first spring rod (42) extends into the first clearance hole (18), and the other end is provided with a first stop (421). The diameter of the first stop (421) is larger than the diameter of the first clearance hole (18). The first spring (41) abuts between the first stop (421) and the first clearance hole (18). The second box body (2) is provided with a second clearance hole (28), which is used to avoid the second spring rod (44). One end of the second spring rod (44) extends into the second clearance hole (28), and the other end is provided with a second stop (441). The diameter of the second stop (441) is larger than the diameter of the second clearance hole (28). The second spring (43) abuts between the second stop (441) and the second clearance hole (28).

7. A folding door hinge structure according to claim 1, characterized in that, The surface of the first box body (1) is provided with a first waist-shaped groove (12) along its length direction, and the other end of the second crank (32) is slidably disposed in the first waist-shaped groove (12). The surface of the second box body (2) is provided with a second waist-shaped groove (22) along its length direction, and the other end of the first crank (31) is slidably disposed in the second waist-shaped groove (22).

8. A folding door hinge structure according to claim 1, characterized in that, The first mounting post (13) is located in the center of the first housing (1), and the second mounting post (23) is located in the center of the second housing (2).

9. A folding door hinge structure according to claim 1, characterized in that, The first box (1) and the second box (2) are both formed by two semi-open shells fastened together, and a receiving cavity is formed between the two semi-open shells. The receiving cavity of the first box (1) is provided with a first alignment post (17), and the receiving cavity of the second box (2) is provided with a second alignment post (27).

10. A folding door hinge structure according to claim 1, characterized in that, The first box body (1) has a first mounting edge (14) that is folded outward at one end, and the first mounting edge (14) has at least two first screw holes (15). The second box body (2) has a second mounting edge (24) that is folded outward at one end, and the second mounting edge (24) has at least two second screw holes (25).

Images