A hydraulic buffer hinge

Abstract

This utility model discloses a hydraulic buffer hinge, comprising: a first hinge, a second hinge, a first rotating sleeve, a second rotating sleeve, a third rotating sleeve, a buffer cylinder, a compression spring, a sliding pin, a first fixed pin, and a transmission component. The first hinge, the first rotating sleeve, the third rotating sleeve, the buffer cylinder, the sliding pin, and the first fixed pin are fixedly connected. Then, the second hinge is fixedly connected to the second rotating sleeve. The transmission component is circumferentially fixed within the second rotating sleeve via a guide structure. When the first hinge rotates relative to the second hinge, the sliding pin moves along the arc-shaped groove on the surface of the transmission component. Since the transmission component is fixed to the output end of the buffer cylinder and is movable, when the transmission component moves towards the buffer cylinder under the action of the sliding pin, the buffer cylinder provides a buffering force to the transmission component, thereby achieving the buffering function. Compared to existing hinge transmission structures, this solution has a simpler structure and can effectively reduce production costs.

Description

Technical Field

[0001] This utility model relates to the field of hinge technology, specifically to a hydraulic buffer hinge. Background Technology

[0002] Hinges, as the core functional component connecting the door body and the door frame, mainly function to enable the flexible rotation and stable support of the door body. At the same time, they control the opening and closing speed and buffering effect of the door through damping adjustment and other mechanisms. They are widely used in building decoration, furniture manufacturing, industrial equipment and other fields.

[0003] For a long time, the transmission structure of a buffer hinge has mainly consisted of a sliding pin, a ramp on a tubular transmission component, and a guide rail on the outer collar of the tubular transmission component. Referring to patent CN202422220338.X, the hinge's transmission operation is mainly accomplished through the cooperation of the ramp 530 on the second tube 120, the guide rail 520 on the collar 200, and the sliding pin 510. However, the above structure is relatively complex, resulting in high costs. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a hydraulic buffer hinge to solve the technical problems of complex transmission structure and high production cost of existing buffer hinges.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a hydraulic buffer hinge, comprising: a first hinge, a second hinge, a first rotating bushing, a second rotating bushing, a third rotating bushing, a buffer cylinder, a compression spring, a sliding pin, a first fixing pin, and a transmission component; the first rotating bushing, the second rotating bushing, and the third rotating bushing are arranged coaxially and rotate sequentially; the transmission component is circumferentially fixed and axially slidingly engaged with the inner side of the second rotating bushing through a guide structure; the buffer cylinder is fixedly disposed within the first rotating bushing, and the output end of the buffer cylinder is connected to the transmission component; one end of the first fixing pin is fixedly disposed within the third rotating bushing. The other end is connected to the sliding pin and extends into the second rotating bushing; one end of the compression spring is connected to the first rotating bushing, and the other end is connected to the transmission component and drives the transmission component to abut against the sliding pin; both ends of the first hinge are fixedly connected to the first rotating bushing and the third rotating bushing, respectively; the middle part of the second hinge is fixedly connected to the second rotating bushing; the transmission component is provided with an arc-shaped groove on the side facing the sliding pin. When the first hinge and the second hinge rotate relative to each other, the sliding pin can slide or roll along the groove surface of the arc-shaped groove, thereby driving the transmission component to continuously approach the buffer cylinder, and the buffering function is achieved by the resistance of the buffer cylinder.

[0006] As a further improvement to the above technical solution, the buffer cylinder is slidably disposed on the inner side of the first rotating bushing along the axial direction; the buffer cylinder also includes a first fastening screw and a second fastening screw, the first fastening screw is threadedly connected to the first rotating bushing and abuts against the side of the buffer cylinder away from the transmission component, the second fastening screw is threadedly connected to the side of the first rotating bushing, and the second fastening screw passes through the side wall of the first rotating bushing and abuts against the side of the first fastening screw.

[0007] As a further improvement to the above technical solution, a spring groove is provided on the side of the first rotating bushing facing the second rotating bushing, and one end of the compression spring abuts against the bottom of the spring groove, and the other end abuts against the transmission component.

[0008] As a further improvement to the above technical solution, the second rotating bushing is rotatably sleeved on the outside of the first rotating bushing; the third rotating bushing is rotatably sleeved on the outside of the second rotating bushing; a first limiting boss is provided on the first rotating bushing; a first rotating washer is provided between the first limiting boss and the end of the second rotating bushing; a second limiting boss is provided on the second rotating bushing; a second rotating washer is provided between the second limiting boss and the end of the third rotating bushing.

[0009] As a further improvement to the above technical solution, a torsion spring is also included. The torsion spring is sleeved on the outside of the first fixing pin, and one end of the torsion spring is connected to the second rotating bushing, and the other end is connected to the third rotating bushing. A torsion spring receiving cavity is provided on the side of the third rotating bushing facing the second bushing, and the torsion spring is disposed in the torsion spring receiving cavity. A first torsion spring mounting hole and a second torsion spring mounting hole are respectively provided on the second rotating bushing and the third rotating bushing. The two ends of the torsion spring are connected to the second rotating bushing and the third rotating bushing respectively through the first torsion spring mounting hole and the second torsion spring mounting hole.

[0010] As a further improvement to the above technical solution, an isolation bushing is also included, which is disposed between the torsion spring and the first fixing pin; the isolation bushing includes a first isolation tube and a second isolation tube coaxially disposed, the first isolation tube and the second isolation tube are respectively fixedly disposed on the second rotating bushing and the third rotating bushing, the second isolation tube is disposed between the torsion spring and the first fixing pin, the first isolation tube is disposed between the torsion spring and the first fixing pin, and the first isolation tube is rotatably connected to the first fixing pin.

[0011] As a further improvement to the above technical solution, the materials of the first rotating bushing, the second rotating bushing, the third rotating bushing, the sliding pin, the first fixed pin, and the transmission component are all engineering plastics.

[0012] As a further improvement to the above technical solution, a first connecting sleeve and a second connecting sleeve are respectively provided at both ends of one side of the first hinge, and the first connecting sleeve and the second connecting sleeve are respectively sleeved on the first rotating shaft sleeve and the third rotating shaft sleeve; the second fastening screw passes through the first connecting sleeve and is threadedly connected to the first rotating shaft sleeve; the second connecting sleeve is fixedly connected to the third rotating shaft sleeve and the first fixed pin through a second fixing pin; and / or a third connecting sleeve is provided in the middle of one side of the second hinge, and the third connecting sleeve is fixedly sleeved on the outside of the second rotating shaft sleeve through a third fastening screw.

[0013] As a further improvement to the above technical solution, a sliding pin hole is provided at the end of the first fixed pin, and the sliding pin is installed in the sliding pin hole; an avoidance groove is provided in the middle of the transmission component; when the sliding pin moves along the groove wall of the arc-shaped groove, the avoidance groove can accommodate the end of the first fixed pin to enter.

[0014] As a further improvement to the above technical solution, the guide structure includes a plurality of guide grooves arranged circumferentially along the inner side of the second rotating bushing, and a guide protrusion disposed on the outer side of the transmission component; the guide protrusion is slidably disposed in the guide groove.

[0015] The beneficial effects of this utility model are as follows: by fixing the first hinge, the first rotating bushing, the third rotating bushing, the buffer cylinder, the sliding pin, and the first fixing pin together, and then fixing the second hinge to the second rotating bushing, and fixing the transmission component circumferentially within the second rotating bushing through the guide structure, when the first hinge rotates relative to the second hinge, the sliding pin will move along the arc groove on the surface of the transmission component. Since the transmission component is fixed to the output end of the buffer cylinder and is movable, when the transmission component moves towards the buffer cylinder under the action of the sliding pin, the buffer cylinder will provide a buffering force for the transmission component, thereby realizing the buffering function. Compared with the existing hinge rotation structure, the structure of this solution is simpler and can effectively reduce production costs. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the hydraulic buffer hinge (with part of the rotating sleeve removed) according to an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the hydraulic buffer hinge (omitting the first and second hinges) according to an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the rotating bushing mounting structure (with part of the rotating bushing removed) according to an embodiment of this utility model;

[0020] Figure 4This is an exploded view of a hydraulic buffer hinge (partial component) according to an embodiment of this utility model. Figure 1 ;

[0021] Figure 5 This is an exploded view of a hydraulic buffer hinge (partial component) according to an embodiment of this utility model. Figure 2 .

[0022] Figure label:

[0023] 11. First hinge; 111. First connecting sleeve; 112. Second connecting sleeve; 113. First through hole; 114. Second through hole; 12. Second hinge; 121. Third connecting sleeve; 122. Third fastening screw;

[0024] 21. First rotating bushing; 211. Spring groove; 212. First limiting boss; 22. Second rotating bushing; 221. Second limiting boss; 222. First torsion spring mounting hole; 223. First isolation tube; 224. Guide groove; 23. Third rotating bushing; 231. Torsion spring receiving cavity; 232. Second torsion spring mounting hole; 233. Second isolation tube; 234. Third through hole; 235. Snap ring groove; 24. First rotating washer; 25. Second rotating washer;

[0025] 31. Buffer cylinder; 311. First fastening screw; 312. Second fastening screw; 32. Compression spring; 33. Torsion spring;

[0026] 4. Transmission components; 41. Arc-shaped groove; 42. Guide ridge;

[0027] 5. First fixing pin; 51. Sliding pin; 52. Fourth through hole; 53. Second fixing pin; 531. Slot; 54. Sliding pin hole;

[0028] 6. Snap ring. Detailed Implementation

[0029] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct connection of components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / installations can use accessories such as screws and bolts, or can be directly connected by welding, bonding, etc. The various technical features in this utility model can be combined interactively without contradicting each other.

[0030] Reference Figure 1-5 This utility model provides a hydraulic buffer hinge, comprising: a first hinge 11, a second hinge 12, a first rotating bushing 21, a second rotating bushing 22, a third rotating bushing 23, a buffer cylinder 31, a compression spring 32, a sliding pin 51, a first fixing pin 5, and a transmission component 4; the first rotating bushing 21, the second rotating bushing 22, and the third rotating bushing 23 are arranged coaxially and rotate sequentially; the transmission component 4 is circumferentially fixed to the inner side of the second rotating bushing 22 and axially slidingly engaged through a guide structure; the buffer cylinder 31 is disposed within the first rotating bushing 21, and the output end of the buffer cylinder 31 is connected to the transmission component 4; one end of the first fixing pin 5 is fixedly disposed within the third rotating bushing 23, and the other end is engaged with the sliding pin 51. Pin 51 is connected to and extends into the second rotating bushing 22; one end of the compression spring 32 is connected to the first rotating bushing 21, and the other end is connected to the transmission member 4 and drives the transmission member 4 to abut against the sliding pin 51; both ends of the first hinge 11 are fixedly connected to the first rotating bushing 21 and the third rotating bushing 23 respectively; the middle part of the second hinge 12 is fixedly connected to the second rotating bushing 22; the transmission member 4 is provided with an arc-shaped groove 41 on the side facing the sliding pin 51. When the first hinge 11 and the second hinge 12 rotate relative to each other, the sliding pin 51 can slide or roll along the groove surface of the arc-shaped groove 41, thereby driving the transmission member 4 to continuously approach the buffer cylinder 31, and the buffering function is achieved by the resistance of the buffer cylinder 31.

[0031] The beneficial effects of this embodiment are as follows: by fixing the first hinge 11, the first rotating bushing 21, the third rotating bushing 23, the buffer cylinder 31, the sliding pin 51, and the first fixing pin 5 together, and then fixing the second hinge 12 to the second rotating bushing 22 together, and fixing the transmission component 4 circumferentially within the second rotating bushing through the guide structure, when the first hinge 11 rotates relative to the second hinge 12, the sliding pin 51 will move along the arc groove 41 on the surface of the transmission component 4. When the transmission component 4 moves toward the buffer cylinder 31 under the action of the sliding pin 51, the buffer cylinder 31 will provide a buffering force for the transmission component 4, thereby realizing the buffering function. Specifically, the transmission component 4 is fixed to the output end of the buffer cylinder 31 and can move axially along the second rotating sleeve 22, while the sliding pin 51 is fixed to the end of the first fixed pin and cannot move axially. When the first hinge 11 and the second hinge 12 rotate relative to each other, the sliding pin 51 will move from the bottom to the top of the arc-shaped groove 41 along the groove wall. That is, the relative position of the transmission component 4 and the sliding pin 51 changes. Since the axial position of the sliding pin 51 is fixed, it will drive the transmission component 4 to move axially closer to the buffer cylinder 31. At this time, the buffer cylinder 31 will provide a buffering force to slow down the rotation, thus realizing the buffering function.

[0032] In this embodiment, the cross-section of the transmission component 4 matches the shape of the inner hole of the second rotating bushing 22. The arc-shaped groove 41 extends through both sides of the transmission component 4. Compared with the existing structure that uses inclined tracks on tubular transmission components for transmission, the structure of the transmission component 4 in this embodiment is simpler, easier to manufacture, and can effectively reduce production costs.

[0033] Specifically, refer to Figures 1 to 2 The buffer cylinder 31 is axially slidably disposed inside the first rotating bushing 21. The buffer cylinder 31 also includes a first fastening screw 311 and a second fastening screw 312. The first fastening screw 311 is threadedly connected to the first rotating bushing 21 and abuts against the side of the buffer cylinder 31 away from the transmission component 4. The second fastening screw 312 is threadedly connected to the side of the first rotating bushing 21 and passes through the side wall of the first rotating bushing 21, pressing against the side of the first fastening screw 311. By sliding the buffer cylinder 31 and the first rotating bushing 21 together, the position of the buffer cylinder 31 can be adjusted using the first fastening screw 311, thereby adjusting the buffer angle conveniently and quickly. The addition of the first fastening screw 311 secures the buffer cylinder 31 after position adjustment, effectively preventing position changes during use and ensuring the stability of the hydraulic buffer hinge.

[0034] Furthermore, refer to Figures 1 to 3The first rotating bushing 21 has a spring groove 211 on the side facing the second rotating bushing 22. One end of the compression spring 32 abuts against the bottom of the spring groove 211, and the other end abuts against the transmission member 4. In this embodiment, the spring groove 211 communicates with the inner hole of the first rotating bushing 21, and part of the buffer cylinder 31 protrudes from the inner hole of the first rotating bushing 21 into the spring groove 211. One end of the compression spring 32 is sleeved on the outside of the buffer cylinder 31, and the outside of the compression spring 32 is clearance-fitted with the spring groove 211. By adding the spring groove 211, it can be used to prevent the compression spring 32 from tilting to one side when compressed, ensuring the normal deformation of the compression spring 32, and thus ensuring the service life of the compression spring 32.

[0035] Furthermore, refer to Figures 1 to 3 The second rotating bushing 22 is rotatably sleeved on the outside of the first rotating bushing 21; the third rotating bushing 23 is rotatably sleeved on the outside of the second rotating bushing 22; the first rotating bushing 21 is provided with a first limiting boss 212; a first rotating washer 24 is provided between the first limiting boss 212 and the end of the second rotating bushing 22; the second rotating bushing 22 is provided with a second limiting boss 221; a second rotating washer 25 is provided between the second limiting boss 221 and the end of the third rotating bushing 23.

[0036] By rotatably fitting the second rotating bushing 22 onto the outside of the first rotating bushing 21 and rotatably fitting the third rotating bushing 23 onto the outside of the second rotating bushing 22, a coaxial rotational connection can be achieved between the first rotating bushing 21, the second rotating bushing 22, and the third rotating bushing 23. The first limiting boss 212 and the second limiting boss 221 are provided for positioning, ensuring the accuracy of the installation position between the first rotating bushing 21, the second rotating bushing 22, and the third rotating bushing 23. The first rotating washer 24 and the second rotating washer 25 improve the stability of the first rotating bushing 21, the second rotating bushing 22, and the third rotating bushing 23 when they rotate relative to each other. In this embodiment, the outer diameters of the first rotating bushing 21, the second rotating bushing 22, and the third rotating bushing 23 are the same.

[0037] Furthermore, refer to Figures 1 to 3It also includes a torsion spring 33, which is sleeved on the outside of the first fixing pin 5, with one end of the torsion spring 33 connected to the second rotating bushing 22 and the other end connected to the third rotating bushing 23; the third rotating bushing 23 has a torsion spring receiving cavity 231 on the side facing the second bushing, and the torsion spring 33 is disposed in the torsion spring receiving cavity 231; the second rotating bushing 22 and the third rotating bushing 23 are respectively provided with a first torsion spring mounting hole 222 and a first torsion spring mounting hole 232, and the two ends of the torsion spring 33 are connected to the second rotating bushing 22 and the third rotating bushing 23 respectively through the first torsion spring mounting hole 222 and the first torsion spring mounting hole 232.

[0038] By adding a torsion spring 33 between the second rotating bushing 22 and the third rotating bushing 23, a torque can be provided. When the door is opened, the torque enables the door to close automatically, effectively improving the user experience. The torsion spring receiving cavity 231 provides a mounting position for the torsion spring 33, while the first torsion spring mounting holes 222 and 232 facilitate the installation of the torsion spring 33, reducing the installation difficulty of the hydraulic buffer hinge.

[0039] Furthermore, it also includes an isolation bushing, which is disposed between the torsion spring 33 and the first fixing pin 5.

[0040] By adding an isolation bushing, the torsion spring 33 and the first fixing pin 5 can be isolated to prevent the torsion spring 33 from rubbing against the first fixing pin 5 and damaging the first fixing pin 5 during the operation of the torsion spring 33, thereby ensuring the service life of the first fixing pin 5.

[0041] In this embodiment, the isolation bushing includes a first isolation tube 223 and a second isolation tube 233 coaxially arranged. The first isolation tube and the second isolation tube 233 are respectively fixedly arranged on the second rotating bushing 22 and the third rotating bushing 23. The second isolation tube 233 is arranged between the torsion spring 33 and the first fixing pin 5. The first isolation tube 223 is arranged between the torsion spring 33 and the first fixing pin 5, and the first isolation tube 223 is rotatably connected to the first fixing pin 5. In another embodiment, the isolation sleeve only includes a first isolation tube 223 fixedly mounted on the second rotating bushing 22, but the first isolation tube 223 extends to one side of the third rotating bushing 23 and is clearance-fitted with the third rotating bushing 23, which can also realize the functions of the isolation torsion spring 33 and the first fixing pin 5; or in another embodiment, the isolation sleeve only includes a second isolation tube 233 fixedly mounted on the third rotating bushing 23, but the second isolation tube 233 extends to one side of the second rotating bushing 22 and is clearance-fitted with the second rotating bushing 22, which can also realize the functions of the isolation torsion spring 33 and the first fixing pin 5.

[0042] Furthermore, the first rotating bushing 21, the second rotating bushing 22, the third rotating bushing 23, the sliding pin 51, the first fixed pin 5, and the transmission component 4 are all made of engineering plastics. By using engineering plastics, the production cost can be effectively reduced while ensuring the cushioning effect. In another embodiment, the first rotating bushing 21, the second rotating bushing 22, the third rotating bushing 23, the sliding pin 51, the first fixed pin 5, and the transmission component 4 can also be made of materials such as aluminum alloy, zinc alloy, or cast iron.

[0043] Furthermore, refer to Figures 4 to 5 The first hinge 11 has a first connecting sleeve 111 and a second connecting sleeve 112 respectively at both ends on one side. The first connecting sleeve 111 and the second connecting sleeve 112 are respectively sleeved on the first rotating shaft sleeve 21 and the third rotating shaft sleeve 23. The second fastening screw 312 passes through the first connecting sleeve 111 and is threadedly connected to the first rotating shaft sleeve 21. The second connecting sleeve 112 is fixedly connected to the third rotating shaft sleeve 23 and the first fixed pin 5 through the second fixing pin 53. And / or the third connecting sleeve 121 is provided in the middle of one side of the second hinge 12. The third connecting sleeve 121 is fixedly sleeved on the outside of the second rotating shaft sleeve 22 through the third fastening screw 122.

[0044] By providing a first connecting sleeve 111 and a second connecting sleeve 112, the connection between the first hinge 11 and the first rotating bushing 21 and the third rotating bushing 23 can be facilitated, improving installation convenience and reducing installation costs. In this embodiment, a first through hole 113 is provided on the first connecting sleeve 111, and fixation can be achieved by cooperating with the second fastening screw 312 through the first through hole 113. The second fastening screw 311 can also be used to fix the buffer cylinder 31. The fixing method of this solution can effectively reduce fixing costs.

[0045] Similarly, please refer to Figures 1 to 5The second connecting sleeve 112 has a second through hole 114, the third rotating bushing 23 has a third through hole 234, and the first fixing pin 5 has a fourth through hole 52. The second through hole 114, the third through hole 234, and the fourth through hole 52 are coaxially arranged and have the same diameter. By adding a second fixing pin 53 and passing it sequentially through the second through hole 114, the third through hole 234, and the fourth through hole 52, the positions of the second connecting sleeve 112, the third rotating bushing 23, and the first fixing pin 5 can be fixed, making the installation convenient. In addition, the bottom of the third rotating bushing 23 is provided with a retaining spring groove 235 communicating with the third through hole 234. The position of the second fixing pin 53 can be fixed by the retaining spring 6, further improving the stability of the installation of the second fixing pin 53. Specifically, the second fixing pin 53 is provided with an annular retaining groove 531, and the retaining spring 6 can be engaged with the retaining groove 531 to fix the position of the second fixing pin 53.

[0046] Furthermore, refer to Figures 1 to 5 The first fixed pin 5 has a sliding pin hole 54 at its end, and the sliding pin 51 is installed in the sliding pin hole 54. The transmission member 4 has a relief groove in its middle. When the sliding pin 51 moves along the wall of the arc-shaped groove 41, the relief groove can accommodate the end of the first fixed pin 5. By providing the sliding pin hole 54, the sliding pin 51 can be rotated, reducing the friction between the sliding pin 51 and the arc-shaped groove 41, thereby ensuring the service life of the sliding pin 51. The relief groove prevents interference between the end of the first fixed pin 5 and the rotating member, ensuring the normal operation of the sliding pin 51.

[0047] Furthermore, refer to Figure 5 The guiding structure includes a plurality of guide grooves 224 arranged circumferentially along the inner side of the second rotating bushing 22, and a guide protrusion 42 disposed on the outer side of the transmission component 4; the guide protrusion 42 is slidably disposed in the guide grooves 224. Through the cooperation of the guide grooves 224 and the guide protrusion 42, the transmission component 4 can be circumferentially fixed to the second rotating bushing 22, and the transmission component 4 can be moved axially along the second rotating bushing 22. It has the characteristics of simple structure and low production cost.

[0048] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A hydraulic cushion hinge, characterized in that, include: The system comprises a first hinge, a second hinge, a first rotating bushing, a second rotating bushing, a third rotating bushing, a buffer cylinder, a compression spring, a sliding pin, a first fixing pin, and a transmission component. The first, second, and third rotating bushings are coaxially arranged and rotate sequentially. The transmission component is circumferentially fixed to the inner side of the second rotating bushing via a guide structure and axially slidingly engaged. The buffer cylinder is fixedly disposed within the first rotating bushing, and its output end is connected to the transmission component. One end of the first fixing pin is fixedly disposed within the third rotating bushing, and the other end is connected to the sliding pin and extends into the second rotating bushing. Inside the rotating bushing; one end of the compression spring is connected to the first rotating bushing, and the other end is connected to the transmission component and drives the transmission component to abut against the sliding pin; both ends of the first hinge are fixedly connected to the first rotating bushing and the third rotating bushing, respectively; the middle part of the second hinge is fixedly connected to the second rotating bushing; the transmission component is provided with an arc-shaped groove on the side facing the sliding pin. When the first hinge and the second hinge rotate relative to each other, the sliding pin can slide or roll along the groove surface of the arc-shaped groove, thereby driving the transmission component to continuously approach the buffer cylinder, and the buffering function is achieved by the resistance of the buffer cylinder.

2. The hydraulic buffer hinge according to claim 1, characterized in that: The buffer cylinder is slidably disposed on the inner side of the first rotating bushing along the axial direction; the buffer cylinder also includes a first fastening screw and a second fastening screw, the first fastening screw is threadedly connected to the first rotating bushing and abuts against the side of the buffer cylinder away from the transmission component, the second fastening screw is threadedly connected to the side of the first rotating bushing and passes through the side wall of the first rotating bushing and abuts against the side of the first fastening screw.

3. The hydraulic buffer hinge according to claim 1, characterized in that: The first rotating bushing has a spring groove on the side facing the second rotating bushing. One end of the compression spring abuts against the bottom of the spring groove, and the other end abuts against the transmission component.

4. The hydraulic buffer hinge according to claim 3, characterized in that: The second rotating bushing is rotatably sleeved on the outside of the first rotating bushing; the third rotating bushing is rotatably sleeved on the outside of the second rotating bushing; the first rotating bushing is provided with a first limiting boss; a first rotating washer is provided between the first limiting boss and the end of the second rotating bushing; the second rotating bushing is provided with a second limiting boss; a second rotating washer is provided between the second limiting boss and the end of the third rotating bushing.

5. The hydraulic buffer hinge according to claim 1, characterized in that: It also includes a torsion spring, which is sleeved on the outside of the first fixing pin, with one end of the torsion spring connected to the second rotating bushing and the other end connected to the third rotating bushing; the third rotating bushing has a torsion spring receiving cavity on the side facing the second bushing, and the torsion spring is disposed in the torsion spring receiving cavity; the second rotating bushing and the third rotating bushing are respectively provided with a first torsion spring mounting hole and a second torsion spring mounting hole, and the two ends of the torsion spring are connected to the second rotating bushing and the third rotating bushing respectively through the first torsion spring mounting hole and the second torsion spring mounting hole.

6. The hydraulic buffer hinge according to claim 5, characterized in that: It also includes an isolation bushing, which is disposed between the torsion spring and the first fixing pin; the isolation bushing includes a first isolation tube and a second isolation tube coaxially disposed, the first isolation tube and the second isolation tube are respectively fixedly disposed on the second rotating bushing and the third rotating bushing, the second isolation tube is disposed between the torsion spring and the first fixing pin, the first isolation tube is disposed between the torsion spring and the first fixing pin, and the first isolation tube is rotatably connected to the first fixing pin.

7. The hydraulic buffer hinge according to claim 1, characterized in that: The first rotating bushing, the second rotating bushing, the third rotating bushing, the sliding pin, the first fixed pin, and the transmission components are all made of engineering plastics.

8. The hydraulic buffer hinge according to claim 2, characterized in that: A first connecting sleeve and a second connecting sleeve are respectively provided at both ends of one side of the first hinge. The first connecting sleeve and the second connecting sleeve are respectively sleeved on the first rotating shaft sleeve and the third rotating shaft sleeve. The second fastening screw passes through the first connecting sleeve and is threadedly connected to the first rotating shaft sleeve. The second connecting sleeve is fixedly connected to the third rotating shaft sleeve and the first fixed pin through a second fixing pin. And / or a third connecting sleeve is provided in the middle of one side of the second hinge. The third connecting sleeve is fixedly sleeved on the outside of the second rotating shaft sleeve through a third fastening screw.

9. The hydraulic buffer hinge according to claim 1, characterized in that: The first fixed pin has a sliding pin hole at its end, and the sliding pin is installed in the sliding pin hole; the transmission component has a relief groove in the middle; when the sliding pin moves along the groove wall of the arc-shaped groove, the relief groove can accommodate the end of the first fixed pin.

10. The hydraulic buffer hinge according to claim 1, characterized in that: The guide structure includes a plurality of guide grooves arranged circumferentially along the inner side of the second rotating bushing, and a guide protrusion disposed on the outer side of the transmission component; the guide protrusion is slidably disposed in the guide groove.

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