Interlocking type anti-springback three-section force hinge

Abstract

The invention relates to the technical field of hinges, and particularly discloses an interlocking type anti-rebound three-section force hinge which comprises a base, a hinge cup, a connecting rod mechanism and a buffer mechanism. One ends of a first swing arm and a second swing arm of the connecting rod mechanism are connected with the hinge arm of the base, and the other ends are respectively hinged to a third connecting hole and a fourth connecting hole of the hinge cup through connecting shafts to form a swingable four-connecting-rod structure; the buffer mechanism is arranged on the base and is linked with the second swing arm. When the hinge is closed, the third connecting hole is located above the rear portion of the fourth connecting hole. And after the door is opened and overturned, the third connecting hole is moved to the front lower part. A buckling part is arranged on a side wing of the first swing arm, when the door is opened to about 90 degrees, the buckling part is in contact with the fourth connecting shaft to generate resistance, and the door opening speed is buffered; when the door plate is opened to the maximum angle, the buckling part and the fourth connecting shaft are automatically locked to form mechanical interlocking, inertia springback of the door plate is thoroughly eliminated through forced clamping, three-section force segmented buffering and maximum opening accurate positioning in the door opening process are achieved, and it is guaranteed that the door plate is opened and closed stably without springback shaking.

Description

Technical Field

[0001] The present invention relates to the technical field of hardware accessories, and in particular to an interlocking anti-rebound three-stage force hinge. Background Art

[0002] The furniture hardware hinge industry has long faced a technical bottleneck: rebound and swaying when the door panel is opened to its maximum angle. Traditional one-stage hinges rely on a single spring return mechanism. When the door panel is opened to an intermediate angle (such as 45°) and the external force is released, the door panel is forced to rebound to its maximum angle (105°), causing a continuous 5°-10° rebound swing. This repeated impact can lead to serious quality defects such as loss of preload in the self-tapping screws, thread stripping and loosening, and even door panel detachment.

[0003] Although the two-stage force hinge is divided into an automatic reset section (0°-60°) and a free hovering section (60°-105°) through a four-bar linkage and a spring lever, it still has fundamental limitations: its hovering section lacks a dynamic damping mechanism. When the user opens the door vigorously, the door panel is likely to skip over the hovering section and go straight to the maximum angle; and the spring deformation limiter cannot completely absorb the inertia of the door panel movement. After the door body reaches the maximum angle, it will still produce 2-3 attenuated rebounds (swing time > 0.5 seconds). Long-term effects will accelerate the failure of the hinge and cabinet connection structure.

[0004] In summary, existing solutions all rely on spring-loaded buffering mechanisms and lack a rigid braking structure, resulting in a compromise between two core requirements: 1. Users cannot achieve stable hovering within a wide range exceeding 30°; 2. The door panel inevitably experiences dampening sway after reaching its maximum angle. This contradiction has become a long-standing technical obstacle hindering the development of high-precision furniture hardware. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing hinge swings back and forth due to inertia when the door panel is opened to the maximum angle, and to provide an interlocking anti-rebound three-stage force hinge.

[0006] In order to achieve the above invention objectives, the present invention adopts the following technical solutions:

[0007] The interlocking anti-rebound three-stage hinge includes a base, a hinge cup, a connecting rod mechanism and a buffer mechanism; the base includes a hinge arm, the connecting rod mechanism includes a first swing arm and a second swing arm, the two ends of the first swing arm and the second swing arm are respectively configured as a hinge arm connecting end and a hinge cup connecting end; a third connecting hole and a fourth connecting hole are provided on the hinge cup; the first swing arm and the second swing arm are respectively connected to the hinge arm through the hinge arm connecting end, the hinge cup connecting end of the first swing arm is connected to the third connecting hole of the hinge cup through the third connecting shaft, and the hinge cup connecting end of the second swing arm is connected to the fourth connecting hole through the fourth connecting shaft. The hinge is connected to the first swing arm, the hinge cup and the second swing arm to form a swingable four-bar linkage; the buffer mechanism is arranged on the base, and its movable end is linked to the linkage mechanism; and the first swing arm includes a swing arm body and side wings extending downward from the swing arm body, and the side wings are provided with a buckling portion; the hinge has an open door state and a closed door state, when the hinge is in the closed door state, the third connecting hole is located above and behind the fourth connecting hole; when the hinge is in the open door state, the third connecting hole is located below and in front of the fourth connecting hole, and the buckling portion is buckled on the fourth connecting shaft.

[0008] In this invention, the hinge switches between closed and open positions by flipping the hinge cup. During this process, the fourth connecting shaft moves upward and backward relative to the first swing arm. When the door is opened to approximately 90°, the edge of the locking portion contacts the axial surface of the fourth connecting shaft, generating resistance that prevents the door from rapidly opening to its maximum angle. When the hinge reaches its maximum angle, the locking portion and the fourth connecting shaft interlock, ensuring that the door stops at its maximum opening and prevents it from swinging back and forth due to inertia.

[0009] Furthermore, the side wing includes a front wing with a flat bottom and a rear wing extending downwardly from the front wing, and the buckling portion includes a buffer guide groove provided on the front wing and opening toward the rear. The front end of the buffer guide groove is in an arc shape that matches the fourth connecting shaft, and the rear end passes through the front wing and extends to the rear wing. A buffer top pressure portion is formed between the lower end of the buffer guide groove and the bottom of the front wing. In this solution, the buckling portion on the side wing has a restraining and guiding effect on the movement of the fourth connecting shaft. In the process of the hinge switching from the closed door state to the open door state, the fourth connecting shaft enters the buffer guide groove from the lower side of the front wing, and finally slides into the front end of the buffer guide groove and buckles with its front end. In this process, the fourth connecting shaft contacts the buffer top pressure portion to generate buffer resistance. In the process of the hinge switching from the open door state to the closed door state, the fourth connecting shaft slides backward from the buffer guide groove and finally disengages from the buckling portion.

[0010] Furthermore, the buffer mechanism includes an elastic buffer and a pressure shaft. The hinge arm is U-shaped with an open lower end, and a first connecting hole and a second connecting hole are provided on both sides of the front end of the U shape, and the second connecting hole is located behind and below the first connecting hole. The hinge arm is connected to the first swing arm through the first connecting hole, and is connected to the rear lower part of the second swing arm through the second connecting hole. The hinge arm connecting end of the second swing arm is provided with mounting holes running through both ends thereof, and the pressure shaft is arranged on the rear upper part of the second swing arm through the mounting holes; the elastic buffer includes a connecting portion and a first pressure foot and a second pressure foot extending obliquely outward from both sides of the connecting portion, the first pressure foot, the connecting portion and the second pressure foot form a V-shaped structure, the connecting portion is sleeved on the first connecting shaft, and the first pressure foot presses against the hinge arm, and the second pressure foot presses against the pressure shaft. In this solution, the second pressure foot contacts the cylindrical surface of the pressure shaft. During the hinge rotation, the pressure shaft rotates to change the force point of the spring, achieving compression and force storage of the spring and opening and releasing of pressure. The positional relationship between the length of the spring clamping foot and the pressure shaft constitutes a balance between the spring elastic force and the gravity of the door panel within a certain angle range, thereby achieving hovering at any position within the range of 30-90 degrees when the door is open, which is convenient for users. When the second swing arm swings from the closed door state to the open door state, the pressure shaft moves along a circular arc trajectory, causing its contact point with the second pressure foot to move downward along the circumferential surface of the pressure shaft; this movement causes the degree to which the second pressure foot is compressed by the pressure shaft (or the amount of compression deformation of the elastic buffer) to continue to increase, forcing the V-shaped elastic buffer to further compress and store energy, thereby achieving gradual absorption of the kinetic energy of door opening.

[0011] Furthermore, the middle diameter of the pressing shaft is larger than the diameters on both sides, and the pressing shaft is connected to the middle of the mounting hole by an interference fit, and the two sides of the pressing shaft are connected to the mounting hole by a clearance fit.

[0012] Furthermore, the buffer mechanism includes a hydraulic cylinder that is compressed when the hinge is in the closed state and stretched when the hinge is in the open state. This solution utilizes an elastic-hydraulic dual-stage buffer system to manage kinetic energy throughout the entire door opening and closing stroke: during the door opening phase, the elastic buffer compresses and stores energy, providing a 30-90° stepless hover, while the hydraulic cylinder stretches to temporarily store residual kinetic energy. During the door closing phase, the elastic member releases energy to assist in the smooth start of the door, while the hydraulic cylinder compresses strongly in the final stage to dissipate energy and eliminate the impact of the door closing. The dual buffers synergistically reduce the door panel's movement speed by over 40%, and there is no rebound in either the fully open or fully closed position.

[0013] Furthermore, the distal end of the first presser foot is provided with an outwardly protruding bent portion, which abuts the U-shaped top wall of the hinge arm via the bent portion. In this embodiment, the addition of the bent portion to the first presser foot alters the spring's force curve at different opening and closing angles, ensuring a weak balance between the spring's elastic force and the weight of the door panel, thereby enabling the door to hover at any position within a 30-90 degree opening range. Furthermore, the bent shape helps reduce the angle of the spring's compression effort, lowering the spring's workload and increasing its lifespan.

[0014] Furthermore, the rear middle portion of the second swing arm is connected to the buffer mechanism.

[0015] Furthermore, a driving protrusion is provided at the rear of the second swing arm. The buffer mechanism is connected to the second swing arm by a transmission mechanism. The transmission mechanism includes a first transmission arm and a second transmission arm. The upper ends of the first transmission arm and the second transmission arm are hinged to each other to form an openable and closable V-shaped structure. The lower end of the first transmission arm is hinged to the movable end of the buffer mechanism, and the lower end of the second transmission arm is hinged to the driving protrusion of the second swing arm. As a result, the V-shaped structure is folded or stretched under the drive of the driving protrusion of the second swing arm, and at the same time drives the buffer mechanism to stretch or compress. In this solution, when the hinge is in the open state, the hinge cup is parallel to the base, the driving protrusion pushes the V-shaped structure to fold, and the movable end of the buffer mechanism is stretched; when the hinge is changed to the closed state, the hinge cup and the base change from parallel to vertical, the front end of the second swing arm swings downward, and the driving protrusion moves to unfold the V-shaped structure, thereby compressing the movable end of the buffer mechanism toward its main body.

[0016] Furthermore, the base also includes a fixed base. The fixed base includes a hinge arm connecting portion adapted to the hinge arm and cabinet connecting portions connected to both sides of the hinge arm connecting portion, and the buffer mechanism is provided on the inner side of the hinge arm connecting portion and is connected to the hinge arm connecting portion via a mounting structure.

[0017] Furthermore, the mounting structure includes a guide shaft disposed at the rear side of the buffer mechanism, wherein both ends of the guide shaft are respectively slidably engaged with linear guide grooves disposed on both sides of the hinge arm connection portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the structural decomposition of the hinge in the expanded state Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the hinge's unfolded state. Figure 1 ;

[0020] Figure 3 It is the structural decomposition of the hinge in the expanded state Figure 2 ;

[0021] Figure 4 This is the structural decomposition of the hinge's expanded state. Figure 3 ;

[0022] Figure 5 It is the structural decomposition of the hinge in the closed state Figure 1 ;

[0023] Figure 6 This is the structural decomposition of the hinge in the hovering state Figure 2 ;

[0024] Figure 7 This is the assembly drawing of the connecting rod mechanism and the buffer mechanism in the closed door state;

[0025] Figure 8 This is the assembly drawing of the connecting rod mechanism and the buffer mechanism in the hovering state;

[0026] Figure 9 This is the assembly drawing of the first swing arm in the closed door state;

[0027] Figure 10 It is a structural diagram of an elastic buffer.

[0028] Description of labels:

[0029] Base 1, fixed base 2, hinge arm connecting part 21, cabinet connecting part 22, mounting structure, guide shaft 23, linear guide groove 24, hinge arm 3, first connecting hole 31, second connecting hole 32, hinge cup 4, third connecting hole 41, fourth connecting hole 42, third connecting shaft 43, fourth connecting shaft 44, second connecting shaft 45, connecting rod mechanism 5, first swing arm 6, side wing 61, front wing 61a, rear wing 61b, buckling part 62, first hinge hole 63, buffering top pressure part 64, third hinge hole 65, first connecting shaft 66, second swing arm 7, driving protrusion 71, buffer mechanism, elastic buffer 81, connecting part 811, first top pressure foot 812, second top pressure foot 813, bending part 814, top pressure shaft 82, hydraulic cylinder 83, transmission mechanism 9, first transmission arm 91, second transmission arm 92. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below with reference to the accompanying drawings:

[0031] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by “front”, “rear”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] See also Figure 1-10As shown, the present invention discloses an interlocking anti-rebound three-stage hinge, comprising a base 1, a hinge cup 4, a connecting rod mechanism 5 and a buffer mechanism; the base 1 comprises a hinge arm 3, the connecting rod mechanism 5 comprises a first swing arm 6 and a second swing arm 7, the two ends of the first swing arm 6 and the second swing arm 7 are respectively configured as hinge arm connection ends and hinge cup connection ends; the hinge cup 4 is provided with a third connection hole 41 and a fourth connection hole 42; the first swing arm 6 and the second swing arm 7 are respectively connected to the hinge arm 3 through the hinge arm connection ends, the hinge cup connection end of the first swing arm 6 is connected to the third connection hole 41 of the hinge cup 4 through a third connection shaft 43, and the hinge cup connection end of the second swing arm 7 is connected to the hinge arm 3 through a fourth connection shaft 44 It is connected to the fourth connecting hole 42, so that a swingable four-bar linkage is formed between the hinge arm 3, the first swing arm 6, the hinge cup 4 and the second swing arm 7; the buffer mechanism is arranged on the base 1, and its movable end is linked to the connecting rod mechanism 5; the first swing arm 6 includes a swing arm body and a side wing 61 extending downward from the swing arm body, and the side wing 61 is provided with a buckling portion 62; the hinge has an open door state and a closed door state. When the hinge is in the closed door state, the third connecting hole 41 is located above and behind the fourth connecting hole 42; when the hinge is in the open door state, the third connecting hole 41 is located below and in front of the fourth connecting hole 42, and the buckling portion 62 is buckled on the fourth connecting shaft 44.

[0033] Furthermore, the side wing 61 includes a front wing 61a with a flush bottom and a rear wing 61b extending downwardly from the front wing 61a. The buckling portion 62 includes a buffer guide groove provided on the front wing 61a and opening toward the rear. The front end of the buffer guide groove is in an arc shape that matches the fourth connecting shaft 44, and the rear end passes through the front wing 61a and extends to the rear wing 61b. A buffer top pressure portion 64 is formed between the lower end of the buffer guide groove and the bottom of the front wing 61a. In this solution, the buckling portion 62 on the side wing 61 has a restraining and guiding effect on the movement of the fourth connecting shaft 44. During the process of the hinge switching from the closed door state to the open door state, the fourth connecting shaft 44 enters the buffer guide groove from the lower side of the front wing 61a, and finally slides into the front end of the buffer guide groove and buckles with its front end. During this process, the fourth connecting shaft 44 contacts the buffer top pressure portion 64 to generate buffering resistance. During the process of the hinge switching from the door-opening state to the door-closing state, the fourth connecting shaft 44 slides backward from the buffer guide groove and eventually disengages from the locking portion 62 .

[0034] Furthermore, the buffer mechanism includes an elastic buffer 81 and a pressure shaft 82. The hinge arm 3 is U-shaped with an open lower end, and a first connecting hole 31 and a second connecting hole 32 are provided on both sides of the front end of the U shape, and the second connecting hole 32 is located below and behind the first connecting hole 31. The hinge arm 3 is connected to the first swing arm 6 through the first connecting hole 31, and is connected to the lower rear part of the second swing arm 7 through the second connecting hole 32. The hinge arm connecting end of the second swing arm 7 is provided with mounting holes running through both ends thereof, and the pressure shaft 82 is arranged on the upper rear part of the second swing arm 7 through the mounting holes; the elastic buffer 81 includes a connecting portion 811 and a first pressure foot 812 and a second pressure foot 813 extending obliquely outward from both sides of the connecting portion 811, and the first pressure foot 812, the connecting portion 811 and the second pressure foot 813 form a V-shaped structure. The elastic buffer 81 is connected to the first connecting hole 31 through the connecting portion 811, and is pressed against the top wall of the U-shaped hinge arm 3 through the first pressing foot 812, and is pressed against the pressing shaft 82 through the second pressing foot 813, and is compressed or expanded as the second swing arm 7 swings. The pressing shaft 82 changes the position of its contact point with the second pressing foot 813 by rotation. In this solution, the second pressing foot 813 contacts the cylindrical surface of the pressing shaft 82. During the hinge rotation process, the pressing shaft 82 rotates to change the force point of the spring, realizing the compression and storage of the spring and the release of pressure when the spring is opened. The positional relationship between the length of the spring clamping foot and the pressing shaft 82 constitutes a balanced relationship between the spring elastic force and the gravity of the door panel within a certain angle range, thereby achieving hovering at any position within the range of 30-90 degrees when the door is opened, which is convenient for users. When the second swing arm 7 swings from the closed state to the open state, the pressing shaft 82 moves along a circular arc trajectory, so that the contact point between it and the second pressing foot 813 moves downward along the circumferential surface of the pressing shaft 82; this movement causes the degree to which the second pressing foot 813 is pressed by the pressing shaft 82 (or the amount of compression deformation of the elastic buffer 81) to continue to increase, forcing the V-shaped elastic buffer 81 to further compress and store energy, thereby realizing the gradual absorption of the kinetic energy of opening the door.

[0035] Furthermore, the hinge arm connection end of the first swing arm 6 is connected to the first connection hole 31 through the first connection shaft 66 , and the hinge arm connection end of the second swing arm 7 is connected to the second connection hole 32 through the second connection shaft.

[0036] Furthermore, the front end and the rear end of the side wing 61 are respectively provided at the third hinge hole 65 and the first hinge hole 63 connected to the third connecting shaft 43 and the first connecting shaft 66 .

[0037] Furthermore, the buffer mechanism includes a hydraulic cylinder 83, which is compressed when the hinge is in the closed state and stretched when the hinge is in the open state. This solution utilizes a dual-stage elastic-hydraulic buffer system to manage kinetic energy throughout the entire door opening and closing stroke: during the door opening phase, the elastic buffer 81 compresses and stores energy, providing a 30-90° stepless hover, while the hydraulic cylinder 83 stretches to temporarily store residual kinetic energy. During the door closing phase, the elastic member releases energy to assist in the smooth start of the door, while the hydraulic cylinder 83 compresses strongly in the final stage to dissipate energy and eliminate the impact of the door closing. The dual buffering synergistically reduces the door panel's movement speed by over 40%, and there is no rebound in either the fully open or fully closed position.

[0038] Furthermore, the end of the first presser foot 812 is provided with an outwardly protruding bent portion 814, which abuts the U-shaped top wall of the hinge arm 3 via the bent portion 814. In this embodiment, the first presser foot 812, by adding the bent portion 814, changes the spring's force curve at different opening and closing angles, ensuring a weak balance between the spring's elastic force and the weight of the door panel, thereby achieving hovering at any position within the door opening range of 30-90 degrees. Furthermore, the change to a bent shape helps reduce the angle of the spring's compression each time, reducing the spring's workload and increasing its durability.

[0039] Furthermore, the middle portion of the rear side of the second swing arm 7 is connected to the buffer mechanism.

[0040] Furthermore, the rear portion of the second swing arm 7 is provided with a driving protrusion 71. The buffer mechanism and the second swing arm 7 are connected via a transmission mechanism 9. The transmission mechanism 9 comprises a first transmission arm 91 and a second transmission arm 92. The upper ends of the first transmission arm 91 and the second transmission arm 92 are hingedly connected to each other, forming an openable and closable V-shaped structure. The lower end of the first transmission arm 91 is hinged to the movable end of the buffer mechanism, while the lower end of the second transmission arm 92 is hinged to the driving protrusion 71 of the second swing arm 7. As a result, the V-shaped structure is driven by the driving protrusion 71 of the second swing arm 7 to fold or extend, simultaneously causing the buffer mechanism to stretch or compress. In this embodiment, when the hinge is in the open position, the hinge cup 4 is parallel to the base 1, and the driving protrusion 71 pushes the V-shaped structure to fold, stretching the movable end of the buffer mechanism. When the hinge is closed, the hinge cup 4 and the base 1 transition from parallel to perpendicular, the front end of the second swing arm 7 swings downward, and the driving protrusion 71 moves, causing the V-shaped structure to unfold, thereby compressing the movable end of the buffer mechanism toward its main body.

[0041] Furthermore, the base 1 also includes a fixed base 2. The fixed base 2 includes a hinge arm connection portion 21 adapted to the hinge arm 3 and cabinet connection portions 22 connected to both sides of the hinge arm connection portion 21. The buffer mechanism is provided on the inner side of the hinge arm connection portion 21 and is connected to the hinge arm connection portion 21 via a mounting structure.

[0042] Furthermore, the mounting structure includes a guide shaft 23 disposed at the rear side of the buffer mechanism. Both ends of the guide shaft 23 are slidably engaged with linear guide grooves 24 disposed on both sides of the hinge arm connecting portion 21.

[0043] In the present invention, the hinge switches between closed and open positions by flipping the hinge cup 4. During this process, the fourth connecting shaft 44 moves upward and backward relative to the first swing arm 6. When the door is opened approximately 90°, the edge of the locking portion 62 contacts the axial surface of the fourth connecting shaft 44, generating resistance that prevents the door from rapidly opening to its maximum angle. Furthermore, when the hinge reaches its maximum angle, the locking portion 62 and the fourth connecting shaft 44 interlock, ensuring that the door stops at its maximum opening and prevents it from swinging back and forth due to inertia.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Based on the disclosure and teachings of the above description, those skilled in the art to which the present invention belongs can also change and modify the above-mentioned embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An interlocking anti-rebound three-stage hinge, The invention comprises a base (1), a hinge cup (4), a connecting rod mechanism (5) and a buffer mechanism; the base (1) comprises a hinge arm (3), the connecting rod mechanism (5) comprises a first swing arm (6) and a second swing arm (7), and the two ends of the first swing arm (6) and the second swing arm (7) are respectively configured as hinge arm connection ends and hinge cup connection ends; The hinge cup (4) is provided with a third connecting hole (41) and a fourth connecting hole (42); The first swing arm (6) and the second swing arm (7) are respectively connected to the hinge arm (3) via the hinge arm connection end; the hinge cup connection end of the first swing arm (6) is connected to the third connection hole (41) of the hinge cup (4) via the third connection shaft (43); and the hinge cup connection end of the second swing arm (7) is connected to the fourth connection hole (42) via the fourth connection shaft (44), so that a swingable connecting rod mechanism is formed between the hinge arm (3), the first swing arm (6), the hinge cup (4) and the second swing arm (7); The buffer mechanism is arranged on the base (1), and its movable end is linked to the connecting rod mechanism (5); Its characteristics are: The first swing arm (6) comprises a swing arm body and a side wing (61) extending downward from the swing arm body, and a buckling portion (62) is provided on the side wing (61); the hinge has an open door state and a closed door state, and when the hinge is in the open door state, the buckling portion (62) is buckled on the fourth connecting shaft (44).

2. The hinge according to claim 1, characterized in that The side wing (61) includes a front wing (61a) with a flush bottom and a rear wing (61b) extending obliquely downward from the front wing (61a); the buckling portion (62) includes a buffer guide groove provided on the front wing (61a) and opening toward the rear; the front end of the buffer guide groove is in an arc shape adapted to the fourth connecting shaft (44); the rear end passes through the front wing (61a) and extends to the rear wing (61b); a buffer pressing portion (64) is formed between the lower end of the buffer guide groove and the bottom of the front wing (61a).

3. The hinge according to claim 2, characterized in that The buffer mechanism includes an elastic buffer member (81) and a top pressure shaft (82); the hinge arm (3) is in a U-shape with an open lower end, and a first connecting hole (31) and a second connecting hole (32) are provided on both sides of the front end of the U-shape, and the second connecting hole (32) is located at the rear and lower part of the first connecting hole (31); the hinge arm (3) is connected to the first swing arm (6) through the first connecting hole (31), and is connected to the rear lower part of the second swing arm (7) through the second connecting hole (32); the hinge arm connecting end of the second swing arm (7) is provided with mounting holes running through both ends thereof, and the top pressure shaft (82) is provided with a plurality of mounting holes running through the hinge arm (8) and the top pressure shaft (82). The elastic buffer (81) is arranged on the upper rear side of the second swing arm (7) through a mounting hole; the elastic buffer (81) includes a connecting portion (811) and a first pressing foot (812) and a second pressing foot (813) extending obliquely outward from both sides of the connecting portion (811); the first pressing foot (812), the connecting portion (811) and the second pressing foot (813) form a V-shaped structure; the connecting portion (811) is sleeved on the first connecting shaft (66), and the first pressing foot (812) abuts against the hinge arm (3), and the second pressing foot (813) abuts against the pressing shaft (82).

4. The hinge according to claim 3, characterized in that The buffer mechanism comprises a hydraulic cylinder (83) which is compressed when the hinge is in a door-closed state and stretched when the hinge is in a door-open state.

5. The hinge according to claim 3, characterized in that The end of the first presser foot (812) is provided with a bent portion (814) protruding outward, and the first presser foot (812) abuts against the U-shaped top wall of the hinge arm (3) through the bent portion (814).

6. The hinge according to claim 1, wherein: The middle portion of the rear side of the second swing arm (7) is connected to the buffer mechanism.

7. The hinge according to claim 6, characterized in that A driving convex portion (71) is provided at the rear of the second swing arm (7), and the buffer mechanism and the second swing arm (7) are connected by a transmission mechanism (9), the transmission mechanism (9) comprising a first transmission arm (91) and a second transmission arm (92), the upper ends of the first transmission arm (91) and the second transmission arm (92) being hinged to each other to form an openable V-shaped structure, the lower end of the first transmission arm (91) being hinged to the movable end of the buffer mechanism, and the lower end of the second transmission arm (92) being hinged to the driving convex portion (71) of the second swing arm (7), so that the V-shaped structure is folded or extended under the drive of the driving convex portion (71) of the second swing arm (7), and simultaneously drives the buffer mechanism to stretch or compress.

8. The hinge according to claim 5, characterized in that The bending portion (814) is in an arc shape.

9. The hinge according to claim 1, wherein: The base (1) further comprises a fixed base (2), the fixed base (2) comprising a hinge arm connecting portion (21) adapted to the hinge arm (3) and cabinet connecting portions (22) connected to both sides of the hinge arm connecting portion (21), the buffer mechanism being arranged on the inner side of the hinge arm connecting portion (21) and connected to the hinge arm connecting portion (21) via a mounting structure.

10. The hinge according to claim 9, characterized in that The mounting structure comprises a guide shaft (23) arranged at the rear side of the buffer mechanism, and both ends of the guide shaft (23) are respectively slidably matched with linear guide grooves (24) arranged on both sides of the hinge arm connecting portion (21).

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