Hinge assembly

Abstract

The utility model discloses a hinge assembly. The hinge assembly comprises a fixed hinge and a movable hinge, the hinge shaft is fixed in the static hinge in a penetrating manner, and a threaded section is arranged at the upper end of the hinge shaft; the movable hinge is arranged on the hinge shaft in a sleeving manner and can rotate relative to the hinge shaft and the static hinge, a convex seat is further arranged in the middle of the movable hinge, and the convex seat is arranged outside the hinge shaft in a sleeving manner and can rotate; the friction damping assembly comprises a movable limiting ring which is arranged on the protruding base in a sleeving mode and can rotate along with the protruding base, a static limiting ring which is arranged on the hinge shaft in a sleeving mode and cannot rotate relative to the hinge shaft, a spring which is arranged on the hinge shaft in a sleeving mode and elastically abuts against the static limiting ring, and a nut which is spirally installed on the threaded section and abuts against the spring. The static limiting ring elastically abuts against the movable limiting ring under the elastic force effect of the spring. The damper module comprises a linear damper and a cam block, the linear damper is transversely mounted on the movable hinge, the cam block is fixed on the hinge shaft and is in contact with the tail end of a piston rod of the linear damper, and the curvature radius of the outer arc surface of the cam block is gradually increased.

Description

Technical fields:

[0001] This utility model relates to the technical field of hinge products, and specifically to a hinge assembly. Background technology:

[0002] Chinese utility model patent application number 202321525868.4 discloses a hovering hinge, which includes an upper bracket and a lower bracket. A pin mechanism is provided between the upper and lower brackets. The pin mechanism includes a first friction plate and a second friction plate. The first friction plate has a shaft groove, and a pin is disposed inside the shaft groove. The second friction plate is fixedly installed on the upper bracket. The upper bracket has a first shaft hole, and the lower bracket has a second shaft hole. This hovering hinge uses the first and second friction plates to surround and fix the pin to the outside, with axial contact, to achieve damping through the axial friction between them. However, the first and second friction plates are in rigid contact with the pin, and the first and second friction plates are locked on both sides by screws, resulting in only line contact between the first and second friction plates and the pin. This leads to a small contact area, i.e., a very small damping force. It is only suitable for hovering very light cover plates, and the damping durability is poor, making it prone to failure after long-term use. Furthermore, this structure requires a large amount of space, which is not conducive to miniaturization design, and since it is a fixed friction force, it does not meet the limit requirement of a larger force at a certain angle.

[0003] Furthermore, even with the aforementioned existing hovering hinges, their function is typically to allow the cover to hover at any angle. This means that the resistance of the hovering hinge is greater than the weight of the cover itself. When subjected to external vibration, the cover will still fall freely, failing to achieve true hovering and thus not meeting the requirements for hovering use. In many actual applications, the hovering hinge needs a limit function when it is opened to its maximum angle or a certain special angle. That is, when subjected to external force or vibration within a certain value, the cover should still remain in its original position, causing considerable inconvenience to the user.

[0004] In view of the above, the inventors propose the following technical solution. Utility model content:

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hinge assembly.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The hinge assembly includes: a stationary hinge; a hinge shaft, which is fixedly inserted into the stationary hinge and has a threaded section at its upper end; a movable hinge, which is sleeved on the hinge shaft and can rotate relative to the hinge shaft and the stationary hinge, and the movable hinge also has a protrusion in its middle, which is sleeved outside the hinge shaft and can rotate; a friction damping assembly, which includes a movable limiting ring sleeved on the protrusion and rotating with the protrusion, and a ring sleeved on the hinge... The assembly includes a stationary limiting ring that cannot rotate relative to the hinge shaft, a spring fitted onto the hinge shaft and elastically pressing against the stationary limiting ring, and a nut screwed onto the threaded section and pressing against the spring. The stationary limiting ring elastically presses against the moving limiting ring under the elastic force of the spring. The damper module includes a linear damper that is laterally mounted on the moving hinge and a cam block fixed on the hinge shaft and in contact with the piston rod end of the linear damper. The radius of curvature of the outer arc surface of the cam block gradually increases.

[0007] Furthermore, in the above technical solution, the upper end of the moving limiting ring is provided with a plurality of spaced first arc-shaped protrusions; the lower end of the stationary limiting ring is provided with a plurality of spaced second arc-shaped protrusions, and a limiting groove is formed between two adjacent second arc-shaped protrusions to accommodate the first arc-shaped protrusions; when the moving limiting ring and the stationary limiting ring rotate relative to each other, the first arc-shaped protrusions and the second arc-shaped protrusions gradually come into contact, and drive the stationary limiting ring to move away from the moving limiting ring, and compress the spring to increase the friction between the moving limiting ring and the stationary limiting ring.

[0008] Furthermore, in the above technical solution, a first polygonal segment is provided in the middle of the hinge shaft, and the hole of the static limiting ring is a first polygonal hole adapted to the first polygonal segment. The static limiting ring is sleeved on the first polygonal segment through the first polygonal hole.

[0009] Furthermore, in the above technical solution, a first limiting groove is provided on the outside of the protrusion, and a first positioning post is provided at the lower end of the moving limiting ring. The first positioning post is inserted into the first limiting groove to form circumferential positioning with the outside of the protrusion.

[0010] Furthermore, in the above technical solution, the moving hinge has a horizontally distributed mounting groove in the middle, the linear damper is fixed in the mounting groove on the rear side, and the piston rod of the linear damper protrudes out of the mounting groove.

[0011] Furthermore, in the above technical solution, the cam block has a first mounting hole that passes through its upper and lower end faces, and the cam block has a first through hole that passes through the first mounting hole laterally; the hinge shaft has a second through hole that corresponds to the first through hole, the cam block is sleeved on the hinge shaft through the first mounting hole, and the first through hole corresponds to the second through hole, and the positioning member passes through the first through hole and the second through hole to fix the cam block to the outside of the hinge shaft.

[0012] Furthermore, in the above technical solution, the hinge shaft is also provided with a first washer and a second washer. The first washer is placed between the upper end face of the moving limit ring and the lower end face of the spring; the second washer is placed between the upper end face of the spring and the lower end face of the nut.

[0013] Furthermore, in the above technical solution, there are two nuts, both of which are helically fixed on the threaded section and in contact with each other.

[0014] Furthermore, in the above technical solution, the lower end of the hinge shaft is provided with a second polygonal segment, the lower end of the static hinge is provided with a second polygonal hole adapted to the second polygonal segment, the second polygonal segment passes through the second polygonal hole, and the upper end of the hinge shaft passes through the second mounting hole provided at the upper end of the static hinge and is limited by a snap ring.

[0015] Furthermore, in the above technical solution, the upper and lower ends of the movable hinge are respectively provided with a first bushing and a second bushing; the first bushing and the second bushing are sleeved outside the hinge shaft and can rotate relative to the hinge shaft.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention provides damping force in two different ways: the friction force generated by the spring compression of the friction damping component applying pressure to the static limit ring and the dynamic limit ring serves as a damping force, while the second damping force is formed by the linear damper of the damper module and the cam block. In this way, the present invention has excellent damping effect, which can make the cover plate fall slowly after being released, without causing hand injury, and at the same time, it will not generate noise or generate very little noise, so as to meet the different usage requirements of the module. Furthermore, the damping force of this hinge assembly can be adjusted in two ways: by adjusting the viscosity of the damping oil in the linear damper and by adjusting the compression of the spring. This allows the hinge assembly to be applicable to products with various resistance torques. The hinge can also achieve arbitrary angle suspension by adjusting the viscosity of the damping oil in the linear damper and the compression of the spring. It also provides a cover plate angle limiting function, meeting the requirement that the cover plate needs a limiting function when opened to its maximum angle or a specific angle. That is, when subjected to external forces or vibrations within a certain value, the hinge assembly can remain stable and not wobble, and the cover plate can remain in its original position, demonstrating excellent quality. Moreover, the main components of this invention, such as the linear damper, nut, spring, moving limit ring, stationary limit ring, and cam block, are all located within the hinge assembly, resulting in a compact structure that reduces the space required for installation, which is beneficial for applications in structures with high installation space requirements. Attached image description:

[0017] Figure 1This is a perspective view of the present invention;

[0018] Figure 2 This is an exploded perspective view of the present invention;

[0019] Figure 3 This is a perspective view of the static limiting ring in this utility model;

[0020] Figure 4 This is a perspective view of the moving limit ring in this utility model. Detailed implementation method:

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0022] See Figure 1-4 The image shows a hinge assembly that can be used in home appliances, smart homes, doors, automobiles, machinery, etc. It is suitable for any environment that requires damping for slow descent and has hovering and limiting functions.

[0023] This utility model hinge assembly includes: a stationary hinge 1, a hinge shaft 2, a movable hinge 3, a friction damping assembly 4, and a damper module 5. The movable hinge 3 and the stationary hinge 1 are connected by the hinge shaft 2 to form a rotatable structure. More specifically, the stationary hinge 1 and the hinge shaft 2 are fixedly assembled and cannot rotate, while the movable hinge 3 and the hinge shaft 2 are rotatably assembled, allowing the movable hinge 3 to rotate relative to the hinge shaft 2. The friction damping assembly 4 is mounted on the hinge shaft 2 and the movable hinge 3, enabling friction damping between the movable hinge 3 and the hinge shaft 2. The damper module 5 is also mounted on the hinge shaft 2 and the movable hinge 3, providing rotational damping.

[0024] The stationary hinge 1 is in the shape of a semi-square frame, and the movable hinge 3 is in the shape of an E.

[0025] In practical use, the static hinge 1 is fixed to the main body of the product, and the movable hinge 3 is fixed to the cover plate (or door), so that the cover plate (or door) can be opened and closed relative to the main body of the product.

[0026] The static hinge 1, hinge shaft 2, and moving hinge 3 are preferably made of metal, which has high hardness, better rigidity, and longer service life. Of course, for some small and light cover plates, when this utility model is used to connect the cover plate to the main body, since the cover plate is small and light, the static hinge 1 and moving hinge 3 can be made of hard plastic, which can also ensure product quality and service life.

[0027] The hinge shaft 2 is fixedly inserted into the stationary hinge 1, and its upper end is provided with a threaded section 21; the movable hinge 3 is sleeved on the hinge shaft 2 and can rotate relative to the hinge shaft 2 and the stationary hinge 1, and the movable hinge 3 is also provided with a boss 31 in the middle, which is sleeved on the outside of the hinge shaft 2 and can rotate; the friction damping assembly 4 includes a movable limiting ring 41 sleeved on the boss 31 and can rotate with the boss 31, a stationary limiting ring 42 sleeved on the hinge shaft 2 and cannot rotate relative to the hinge shaft 2, and a movable limiting ring 43 sleeved on the hinge shaft 2 and... The spring 43 elastically presses against the static limiting ring 42 and the nut 44 is helically installed on the threaded section 21 and presses against the spring 43. The static limiting ring 42 elastically presses against the moving limiting ring 41 under the elastic force of the spring 43. The damper module 5 includes a linear damper 51 horizontally installed on the moving hinge 3 and a cam block 52 fixed on the hinge shaft 2 and in contact with the end of the piston rod 511 of the linear damper 51. The radius of curvature of the outer arc surface 520 of the cam block 52 gradually increases.

[0028] The working principle of this invention is as follows: the movable hinge 3 rotates relative to the hinge shaft 2 and the stationary hinge 1. At this time, since the movable hinge 3 rotates synchronously with the movable limiting ring 41, the hinge shaft 2 and the stationary limiting ring 42 are fixed to each other and cannot rotate. The spring 43 provides elastic force on the stationary limiting ring 42, causing the stationary limiting ring 42 and the movable limiting ring 41 to elastically press against each other. As a result, when the movable hinge 3 rotates, it will drive the movable limiting ring 41 to rotate relative to the hinge shaft 2 and the stationary limiting ring 42. At this time, the movable limiting ring 41 and the stationary limiting ring 42 form elastic friction damping. The friction force is large, and the compression of the spring 43 can be adjusted by the spiral nut to adjust the magnitude of the elastic friction damping force, so as to achieve the hovering function. At the same time, the linear damper 51 also rotates with the movable hinge 3 and interacts with the outer arc surface of the cam block 52. Upon contact, the outer arc surface of the cam block 52 continuously compresses the linear damper 51, causing the linear damper 51 to exert a damping effect. Simultaneously, linear dampers 51 with different damping oil viscosities can be used to adjust the damping force, thereby achieving a hovering function. In other words, this invention provides damping force in two different ways: the friction force generated by the spring compression of the friction damping assembly 4 applying pressure to the static limit ring and the moving limit ring serves as a damping force; simultaneously, a second damping force is formed by the cooperation of the linear damper 51 and the cam block 52 in the damper module 5. This gives the invention excellent damping performance, allowing the released cover to fall slowly without pinching hands, and generating minimal or no noise, thus meeting different usage requirements of the module. Furthermore, the damping force of this hinge assembly can be adjusted in two ways: one is by adjusting the viscosity of the damping oil in the linear damper, and the other is by adjusting the compression of the spring. This allows a single hinge assembly to be applicable to products with various resistance torques. The hinge can also be stopped at any angle by adjusting the viscosity of the damping oil in the linear damper and the compression of the spring. Additionally, it provides a cover plate angle limit function, meeting the following requirements: when the cover plate is opened to its maximum angle or a specific angle, a limit function is needed. That is, when subjected to external force or vibration within a certain value, the hinge assembly of this invention can remain stable and not wobble, and the cover plate can still maintain its original position, thus exhibiting excellent quality.

[0029] The main components of this invention, such as the linear damper, nut, spring, moving limit ring, stationary limit ring, and cam block, are all located within the hinge assembly. This compact structure reduces the space required for hinge assembly installation, making it suitable for applications in structures with high installation space requirements.

[0030] The upper end of the moving limiting ring 41 is provided with a plurality of spaced first arc-shaped protrusions 410; the lower end of the stationary limiting ring 42 is provided with a plurality of spaced second arc-shaped protrusions 420, and a limiting groove 4200 is formed between two adjacent second arc-shaped protrusions 420 to accommodate the first arc-shaped protrusions 410. When the moving limiting ring 41 and the stationary limiting ring 42 rotate relative to each other, the first arc-shaped protrusions 410 and the second arc-shaped protrusions 420 gradually come into contact, and drive the stationary limiting ring 42 to move away from the moving limiting ring 41, and compress the spring 43 to increase the friction between the moving limiting ring 41 and the stationary limiting ring 42.

[0031] The hinge assembly of this utility model achieves its limiting function by having the first arc-shaped protrusion 410 of the moving limiting ring 41 fall into the limiting groove 4200 of the stationary limiting ring 41 and fit tightly together. When the first arc-shaped protrusion 410 falls into the next limiting groove 4200, it can perform the limiting function. By pressing down the cover plate, the hinge assembly continues to close, and the first arc-shaped protrusion 410 falls into the next limiting groove 4200, which can perform the next limiting function. Furthermore, when the moving limiting ring 41 and the stationary limiting ring 42 rotate relative to each other, the first arc-shaped protrusion 410 gradually contacts the second arc-shaped protrusion 420, driving the stationary limiting ring 42 to move away from the moving limiting ring 41 and compressing the spring 43 to increase the friction between the moving limiting ring 41 and the stationary limiting ring 42, thereby forming an excellent friction damping effect. The magnitude of the limiting force, the limiting spring force, and the height difference of the arc-shaped protrusions on the moving and stationary limiting rings are all related to the actual usage requirements.

[0032] The assembly structure of the static limiting ring 42 and the hinge shaft 2 is as follows: a first polygonal segment 22 is provided in the middle of the hinge shaft 2, and the hole of the static limiting ring 42 is a first polygonal hole 421 that is adapted to the first polygonal segment 22. The static limiting ring 42 is sleeved on the first polygonal segment 22 through the first polygonal hole 421, that is, it can form a quick assembly and can form circumferential positioning to achieve synchronous rotation. In this embodiment, the cross-section of the first polygonal segment 22 and the first polygonal hole 421 are both rectangular.

[0033] The outer side of the protrusion 31 is provided with a first limiting groove 311, and the lower end of the moving limiting ring 41 is provided with a first positioning post 411. The first positioning post 411 is inserted into the first limiting groove 311 to form circumferential positioning with the outer side of the protrusion 31, so as to achieve synchronous rotation. Its assembly structure is simple.

[0034] The hinge 3 has a horizontally distributed mounting groove 32 in the middle. The linear damper 51 is fixed in the mounting groove 32 through its rear side. The piston rod 511 of the linear damper 51 protrudes out of the mounting groove 32. It is a replaceable assembly structure, that is, the linear damper 51 is external. By replacing the linear damper 51 with one of different resistance values, the falling time of the cover plate can be changed to accommodate cover plates of different weights. Since the outer arc surface of the cam block 52 is a variable radius arc surface, it is always in contact with the piston rod 511 on the linear damper 31. During the closing process of the hinge assembly, the radius of curvature of the outer arc surface of the cam block 52 gradually increases, and the linear damper 51 is gradually compressed to generate damping force, so that the hinge achieves the function of damped buffer falling.

[0035] The assembly structure of the cam block 52 and the hinge shaft 2 is as follows: the cam block 52 has a first mounting hole 521 that passes through its upper and lower end faces, and the cam block 52 has a first through hole 522 that passes through the first mounting hole 521 laterally; the hinge shaft 2 has a second through hole 23 that corresponds to the first through hole 522; the cam block 52 is sleeved on the hinge shaft 2 through the first mounting hole 521, and the first through hole 522 corresponds to the second through hole 23; the positioning member 53 (a pin) passes through the first through hole 522 and the second through hole 23 to fix the cam block 52 to the outside of the hinge shaft 2, ensuring that no relative movement occurs. The assembly structure is simple and easy to install.

[0036] The hinge shaft 2 is also provided with a first washer 24 and a second washer 25. The first washer 24 is placed between the upper end face of the moving limit ring 41 and the lower end face of the spring 43; the second washer 25 is placed between the upper end face of the spring 43 and the lower end face of the nut 44.

[0037] There are two nuts 44, both of which are screwed onto the threaded section 21 and in contact with each other, thus achieving an interlocking function, which allows the compression of the spring to remain constant during rotation.

[0038] The lower end of the hinge shaft 2 is provided with a second polygonal segment 26, and the lower end of the static hinge 1 is provided with a second polygonal hole 11 that is adapted to the second polygonal segment 26. The second polygonal segment 26 passes through the second polygonal hole 11. The upper end of the hinge shaft 2 passes through the second mounting hole 12 provided at the upper end of the static hinge 1 and is locked and limited by a snap ring 27. Its assembly structure is simple and easy to install.

[0039] The upper and lower ends of the movable hinge 3 are respectively provided with a first bushing 33 and a second bushing 34; the first bushing 33 and the second bushing 34 are sleeved on the outside of the hinge shaft 2 and can rotate relative to the hinge shaft 2, which can reduce wear and improve the service life of the product.

[0040] In summary, this invention provides damping force in two different ways: the friction force generated by the spring compression of the friction damping component 4 applying pressure to the static limiting ring and the moving limiting ring serves as a damping force; simultaneously, a second damping force is formed by the linear damper 51 of the damper module 5 cooperating with the cam block 52. This gives the invention excellent damping effect, allowing the cover to fall slowly after being released, preventing hand injuries, and generating little or no noise, thus meeting different usage requirements of the module. Furthermore, the damping force of this hinge assembly can be adjusted in two ways: by adjusting the viscosity of the damping oil in the linear damper and by adjusting the compression of the spring. This allows the hinge assembly to be applicable to products with various resistance torques. The hinge can also achieve arbitrary angle suspension by adjusting the viscosity of the damping oil in the linear damper and the compression of the spring. It also provides a cover plate angle limiting function, meeting the requirement that the cover plate needs a limiting function when opened to its maximum angle or a specific angle. That is, when subjected to external forces or vibrations within a certain value, the hinge assembly of this invention can remain stable and not wobble, and the cover plate can still maintain its original position, thus exhibiting excellent quality. The main components of this invention, such as the linear damper, nut, spring, moving limit ring, stationary limit ring, and cam block, are all located within the hinge assembly, resulting in a compact structure that reduces the space required for installation, which is beneficial for applications in structures with high installation space requirements.

[0041] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. A hinge assembly, characterized in that: include: Quiet hinge (1); The hinge shaft (2) is fixed in the static hinge (1) and has a threaded section (21) at its upper end; The movable hinge (3) is sleeved on the hinge shaft (2) and can rotate relative to the hinge shaft (2) and the stationary hinge (1). The movable hinge (3) is also provided with a protrusion (31) in the middle. The protrusion (31) is sleeved on the outside of the hinge shaft (2) and can rotate. The friction damping assembly (4) includes a moving limiting ring (41) sleeved on the boss (31) and rotatable with the boss (31), a stationary limiting ring (42) sleeved on the hinge shaft (2) and not rotatable relative to the hinge shaft (2), a spring (43) sleeved on the hinge shaft (2) and elastically pressing against the stationary limiting ring (42), and a nut (44) screwed on the threaded section (21) and pressing against the spring (43). The stationary limiting ring (42) elastically presses against the moving limiting ring (41) under the elastic force of the spring (43). The damper module (5) includes a linear damper (51) mounted laterally on the hinge (3) and a cam block (52) fixed on the hinge shaft (2) and in contact with the end of the piston rod (511) of the linear damper (51). The radius of curvature of the outer arc surface (520) of the cam block (52) gradually increases.

2. A hinge assembly according to claim 1, characterized in that: The upper end of the moving limiting ring (41) is provided with a plurality of spaced first arc-shaped protrusions (410); the lower end of the stationary limiting ring (42) is provided with a plurality of spaced second arc-shaped protrusions (420), and a limiting groove (4200) is formed between two adjacent second arc-shaped protrusions (420) to accommodate the first arc-shaped protrusions (410); when the moving limiting ring (41) and the stationary limiting ring (42) rotate relative to each other, the first arc-shaped protrusions (410) and the second arc-shaped protrusions (420) gradually come into contact, and drive the stationary limiting ring (42) to move away from the moving limiting ring (41), and compress the spring (43) to increase the friction between the moving limiting ring (41) and the stationary limiting ring (42).

3. A hinge assembly according to claim 1, characterized in that: The hinge shaft (2) has a first polygonal segment (22) in the middle. The hole of the static limiting ring (42) is a first polygonal hole (421) that is adapted to the first polygonal segment (22). The static limiting ring (42) is sleeved on the first polygonal segment (22) through the first polygonal hole (421).

4. A hinge assembly according to claim 1, characterized in that: The protrusion (31) is provided with a first limiting groove (311) on the outside, and the lower end of the moving limiting ring (41) is provided with a first positioning post (411). The first positioning post (411) is inserted into the first limiting groove (311) to form circumferential positioning with the outside of the protrusion (31).

5. A hinge assembly according to claim 1, characterized in that: The hinge (3) has a horizontally distributed mounting groove (32) in the middle. The linear damper (51) is fixed in the mounting groove (32) on the rear side. The piston rod (511) of the linear damper (51) protrudes out of the mounting groove (32).

6. A hinge assembly according to claim 5, characterized in that: The cam block (52) has a first mounting hole (521) that passes through its upper and lower end faces, and the cam block (52) has a first through hole (522) that passes through the first mounting hole (521) laterally. The hinge shaft (2) has a second through hole (23) that corresponds to the first through hole (522). The cam block (52) is sleeved on the hinge shaft (2) through the first mounting hole (521), and the first through hole (522) corresponds to the second through hole (23). The positioning member (53) passes through the first through hole (522) and the second through hole (23) to fix the cam block (52) to the outside of the hinge shaft (2).

7. A hinge assembly according to any one of claims 1-6, characterized in that: The hinge shaft (2) is also provided with a first washer (24) and a second washer (25). The first washer (24) is placed between the upper end face of the moving limit ring (41) and the lower end face of the spring (43); the second washer (25) is placed between the upper end face of the spring (43) and the lower end face of the nut (44).

8. A hinge assembly according to any one of claims 1-6, characterized in that: There are two nuts (44), both of which are screwed onto the threaded section (21) and in contact with each other.

9. A hinge assembly according to any one of claims 1-6, characterized in that: The lower end of the hinge shaft (2) is provided with a second polygonal segment (26), and the lower end of the static hinge (1) is provided with a second polygonal hole (11) that is adapted to the second polygonal segment (26). The second polygonal segment (26) passes through the second polygonal hole (11), and the upper end of the hinge shaft (2) passes through the second mounting hole (12) provided at the upper end of the static hinge (1) and is then locked by a retaining ring (27).

10. A hinge assembly according to any one of claims 1-6, characterized in that: The upper and lower ends of the movable hinge (3) are respectively provided with a first bushing (33) and a second bushing (34); the first bushing (33) and the second bushing (34) are sleeved on the outside of the hinge shaft (2) and can rotate relative to the hinge shaft (2).

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