A damping hinge

Abstract

The present invention relates to a damping hinge, comprising a housing, a damping shaft is arranged in the housing and filled with damping liquid, at least two damping baffles are arranged on the damping shaft, the damping shaft can drive the damping baffles to rotate, at least one damping valve is arranged on the damping baffle, a blade is hinged on the damping valve, the damping liquid can push the blade to rotate to open the damping valve, a first limiting structure and a second limiting structure are arranged on the damping valve, the first limiting structure is used to limit the rotation of the blade when the damping shaft rotates forward, so that the damping valve is in a first open gear, the second limiting structure is used to limit the rotation of the blade when the damping shaft rotates reversely, so that the damping valve is in a second open gear, and the liquid flow channel of the first open gear is larger than the liquid flow channel of the second open gear. The damping hinge of the present invention can achieve the effect of fast forward rotation and slow reverse rotation, and has a simple structure, reliable operation, and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of hinges, and more specifically to a damping hinge. Background Art

[0002] With the gradual popularization of smart homes, damping hinges are increasingly used in various home products, such as curtains, rolling blinds, projection screens, clothes hangers, rice cooker lids and other products that need to be extended, lifted and flipped. Damping hinges use damping oil to flow in a closed container in a directional manner to achieve a buffering effect, which has the effect of shockproof and noise reduction, can improve the grade of the product and extend the service life of the product. In addition, in order to meet the urgent requirements of customers when using the product, the damping hinges used in the product also need to have different damping forces when rotating forward and reverse, and can achieve the effects of fast forward rotation and slow reverse rotation. The damping hinges of the existing technology need to use springs and oil tanks for damping adjustment, and the structure is complex. The service life of the hinge is restricted by the spring. Once the spring fails, the hinge will no longer be usable. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a damping hinge which can achieve the effects of fast forward rotation and slow reverse rotation, and has a simple structure, reliable operation and low manufacturing cost.

[0004] The technical solution of the present invention is to provide a damping hinge, including a shell, in which a damping shaft is arranged and filled with damping fluid, at least two damping baffles are arranged on the damping shaft, the damping shaft can drive the damping baffles to rotate, at least one damping valve is arranged on the damping baffle, blades are hinged on the damping valve, the damping fluid can drive the blades to rotate to open the damping valve, and a first limiting structure and a second limiting structure are arranged on the damping valve. The first limiting structure is used to limit the rotation of the blades when the damping shaft rotates forward, so that the damping valve is in a first open position, and the second limiting structure is used to limit the rotation of the blades when the damping shaft rotates reversely, so that the damping valve is in a second open position, and the flow channel of the first open position is larger than the flow channel of the second open position.

[0005] Compared with the prior art, the damping hinge of the present invention has the following advantages: when it is necessary to make the damping hinge realize rapid forward rotation, the damping shaft is driven to rotate in the forward direction, the damping baffle rotates synchronously with the damping shaft, and the damping fluid generates a blocking force on the damping baffle, so that the damping fluid moves in the opposite direction relative to the damping baffle. Therefore, the damping fluid pushes the blades on the damping valve to move in the opposite direction relative to the damping baffle until the blades are limited by the first limiting structure. At this time, the damping valve is in the first open gear. The first open gear has a large liquid flow channel relative to the second open gear, that is, the opening degree of the damping valve is large. In unit time, the flow rate of the damping fluid through the damping valve is large, so that the blocking force of the damping fluid on the damping baffle is weakened, and the damping force inside the damping hinge is small. In the weak damping state, the damping hinge can realize fast forward rotation; when the damping hinge needs to realize slow reversal, the damping shaft is driven to rotate in the opposite direction, the damping baffle rotates synchronously with the damping shaft, the damping fluid generates a blocking force on the damping baffle, and pushes the blade on the damping valve to move in the opposite direction relative to the damping baffle until the blade is limited by the second limiting structure. At this time, the damping valve is in the second open gear. The second open gear is relative to the first open gear, and the flow channel is small, that is, the opening degree of the damping valve is small. In unit time, the flow volume of the damping fluid through the damping valve is also small, so that the damping force of the damping fluid on the damping baffle is weakened to a small extent, the damping force inside the damping hinge is large, and a strong damping state is presented, and the damping hinge can realize slow reversal. The damping valve is a structure set on the damping baffle, and the damping change is completely controlled by the flow direction of the damping fluid, without the need for spring control. It has a simple structure, reliable operation, and low manufacturing cost. All parts of the damping hinge are in the shell, and the service life is long.

[0006] Preferably, the hinge axis between the blade and the damping valve is parallel to the damping axis, the hinge axis is located in the middle of the blade, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are respectively located on the front and rear sides of the damping valve, the second limiting structure is located on the side opposite to the hinge axis and the damping axis, one side of the blade is opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0007] With this structure, one side of the blade is always opposite to the first limiting structure and the second limiting structure, and the side is opposite to the damping shaft. When the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. Due to the principle of centrifugal force, the force on the side of the blade away from the damping shaft is greater than the force on the side of the blade close to the damping shaft. When the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping fluid pushes the blade to swing in the opposite direction until the side of the blade opposite to the first limiting structure and the second limiting structure conflicts with the first limiting structure. The first limiting structure limits the blade, and the thrust of the damping fluid on the blade is balanced with the force of the first limiting structure on the blade. The damping valve will be stable in the first open position. In unit time, the flow rate of the damping fluid through the damping valve is stable. Due to the connection between the first limiting structure and the hinge shaft When the distance between the blade and the first limiting structure and the second limiting structure is smaller than the distance between the second limiting structure and the hinge shaft, the angle between the blade and the damping baffle is large, the degree of opening of the damping valve is also large, and the damping hinge rotates forward stably and rapidly; when the damping baffle rotates in the opposite direction synchronously with the damping shaft, the damping fluid pushes the blade to swing forward until the side of the blade opposite to the first limiting structure and the second limiting structure conflicts with the second limiting structure. The second limiting structure limits the blade, and the thrust of the damping fluid on the blade is balanced by the force of the second limiting structure on the blade. The damping valve will stabilize in the second open position. Per unit time, the flow rate of the damping fluid through the damping valve is stable. Compared with the time when the blade conflicts with the first limiting structure, the angle between the blade and the damping baffle is small at this time, the degree of opening of the damping valve is also small, and the damping hinge reverses slowly and stably. The first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively. The first limiting structure can also be located when the blade rotates to a plane perpendicular to the damping baffle. The first limiting structure and the second limiting structure can both prevent the blade from rotating to a plane that coincides with or is parallel to the damping baffle, so that the damping valve is normally open.

[0008] Preferably, the hinge axis between the blade and the damping valve is parallel to the damping axis, the hinge axis is located in the middle of the blade, the blade can swing bidirectionally around its hinge axis, the first limiting structure and the second limiting structure are respectively located on the front and rear sides of the damping valve, the second limiting structure is located on the side opposite to the hinge axis and the damping axis, one side of the blade is opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0009] This structure is similar to the above-mentioned preferred scheme, with the difference that the side of the blade that is always opposite to the first limiting structure and the second limiting structure is opposite to the damping shaft. With this structure, when the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. Also due to the centrifugal force principle, the force on the side of the blade away from the damping shaft is greater than the force on the side of the blade close to the damping shaft. When the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping fluid pushes the blade to swing in the opposite direction until the side of the blade opposite to the damping shaft conflicts with the first limiting structure, so that the damping valve is stabilized in the first open position and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously with the damping shaft in the reverse direction, the damping fluid pushes the blade to swing in the forward direction until the side of the blade opposite to the damping shaft conflicts with the second limiting structure, so that the damping valve is stabilized in the second open position and the damping hinge rotates slowly. The first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively. The first limiting structure can also be located when the blade rotates to a plane perpendicular to the damping baffle. The first limiting structure and the second limiting structure can both prevent the blade from rotating to a plane that coincides with or is parallel to the damping baffle, so that the damping valve is normally open.

[0010] Preferably, the hinge axis between the blade and the damping valve is parallel to the damping axis, the hinge axis is located in the middle of the blade, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are both located on the front side or the rear side of the damping valve, the two side surfaces of the blade are respectively opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0011] With this structure, the blade is always located between the first limiting structure and the second limiting structure. When the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. Also due to the centrifugal force principle, the force on the side of the blade away from the damping shaft is greater than the force on the side of the blade close to the damping shaft. When the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping fluid pushes the blade to swing in the reverse direction until the side of the blade opposite to the first limiting structure conflicts with the first limiting structure, so that the damping valve is stabilized in the first open position and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously with the damping shaft in the reverse direction, the damping fluid pushes the blade to swing in the forward direction until the side of the blade opposite to the second limiting structure conflicts with the second limiting structure, so that the damping valve is stabilized in the second open position and the damping hinge rotates slowly. The first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively. The first limiting structure can also be located when the blade rotates to a plane perpendicular to the damping baffle. The first limiting structure and the second limiting structure can both prevent the blade from rotating to a plane that coincides with or is parallel to the damping baffle, so that the damping valve is normally open.

[0012] Preferably, the hinge axis between the blade and the damping valve is parallel to the damping axis, the hinge axis is located in the middle of the blade, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are both located on the front side or the rear side of the damping valve, one side of the blade is opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0013] With this structure, one side of the blade is always opposite to the first limiting structure and the second limiting structure, and the blade can swing to a plane that coincides with or is parallel to the damping baffle. Even if the damping valve is closed, the damping hinge can stop rotating by itself when the damping valve is closed; when the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. Similarly, due to the principle of centrifugal force, the force on the side of the blade away from the damping shaft is greater than the force on the side of the blade close to the damping shaft. When the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping fluid pushes the blade to swing in the opposite direction until the side of the blade opposite to the first limiting structure and the second limiting structure coincides with the first limiting structure. The limiting structures conflict with each other, so that the damping valve is stabilized in the first open position, and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously in the opposite direction with the damping shaft, the damping fluid pushes the blade to swing forward until the side of the blade opposite to the first limiting structure and the second limiting structure conflicts with the second limiting structure, so that the damping valve is stabilized in the second open position, and the damping hinge reverses slowly; the first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively, the first limiting structure can also be located in a plane where the blade rotates to be perpendicular to the damping baffle, and the first limiting structure can be flush with the hinge shaft.

[0014] Preferably, the hinge axis between the blade and the damping valve is perpendicular to the damping axis, the area of ​​the blade on one side of the hinge axis is larger than the area of ​​the blade on the other side of the hinge axis, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are respectively located on the front and rear sides of the damping valve, the two side surfaces of the blade are respectively opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0015] With this structure, the blade is always located between the first limit structure and the second limit structure. Under the push of the damping fluid, the blade can swing between the first limit structure and the second limit structure. The blade can swing to a plane that coincides with or is parallel to the damping baffle. Even if the damping valve is closed, the damping hinge can stop rotating by itself when the damping valve is closed. When the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. The part of the blade with a larger area on one side of the hinge shaft receives a greater thrust from the damping fluid than the part of the blade with a smaller area on the other side of the hinge shaft. This can avoid the problem of uncertain rotation direction of the blade due to force balance at both ends of the blade. When the damping baffle rotates synchronously with the damping shaft During forward rotation, the damping fluid pushes the blade to swing in the opposite direction until the side of the blade opposite to the first limiting structure conflicts with the first limiting structure, so that the damping valve is stabilized in the first open position, and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously in the opposite direction with the damping shaft, the damping fluid pushes the blade to swing in the forward direction until the side of the blade opposite to the second limiting structure conflicts with the second limiting structure, so that the damping valve is stabilized in the second open position, and the damping hinge reverses slowly; the first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively, and the first limiting structure can also be located in a plane where the blade rotates to be perpendicular to the damping baffle, and the first limiting structure can be flush with the hinge shaft.

[0016] Preferably, the hinge axis between the blade and the damping valve is perpendicular to the damping axis, the area of ​​the blade on one side of the hinge axis is larger than the area of ​​the blade on the other side of the hinge axis, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are respectively located on the front and rear sides of the damping valve, one side of the blade is respectively opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0017] With this structure, one side of the blade is always opposite to the first limiting structure and the second limiting structure, and the first limiting structure and the second limiting structure can prevent the blade from rotating to a plane that coincides with or is parallel to the damping baffle, even if the damping valve is normally open; when the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle, and the part of the blade with a larger area on one side of the hinge shaft is subjected to a thrust of the damping fluid that is greater than the part of the blade with a smaller area on the other side of the hinge shaft. In this way, the problem of uncertain rotation direction of the blade due to force balance at both ends of the blade can be avoided; when the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping fluid pushes the blade to swing in the reverse direction. , until the side surfaces of the blade opposite to both the first limiting structure and the second limiting structure conflict with the first limiting structure, so that the damping valve is stabilized in the first open position, and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously in the opposite direction with the damping shaft, the damping fluid pushes the blade to swing forward, until the side surfaces of the blade opposite to both the first limiting structure and the second limiting structure conflict with the second limiting structure, so that the damping valve is stabilized in the second open position, and the damping hinge reverses slowly; the first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively, and the first limiting structure can also be located in a plane where the blade rotates to be perpendicular to the damping baffle.

[0018] Preferably, the hinge axis between the blade and the damping valve is perpendicular to the damping axis, the area of ​​the blade on one side of the hinge axis is larger than the area of ​​the blade on the other side of the hinge axis, the blade can swing in both directions around its hinge axis, the first limiting structure and the second limiting structure are both located on the front side or the rear side of the damping valve, one side of the blade is opposite to the first limiting structure and the second limiting structure, and the distance between the first limiting structure and the hinge axis is smaller than the distance between the second limiting structure and the hinge axis.

[0019] With this structure, since the first limiting structure and the second limiting structure are both located on the front side or the rear side of the damping valve and on the same side of the blade, the blade can swing to a plane that coincides with or is parallel to the damping baffle. Even if the damping valve is closed, the damping hinge can stop rotating by itself when the damping valve is closed. When the damping shaft rotates, the damping fluid generates a blocking force on the damping baffle. The thrust of the damping fluid on the larger area of ​​the blade on one side of the hinge shaft is greater than the thrust of the damping fluid on the smaller area of ​​the blade on the other side of the hinge shaft. This can avoid the problem of uncertain rotation direction of the blade due to force balance at both ends of the blade. When the damping baffle rotates synchronously with the damping shaft in the forward direction, the damping The liquid pushes the blade to swing in the opposite direction until the side of the blade opposite to the first limiting structure and the second limiting structure conflicts with the first limiting structure, so that the damping valve is stabilized in the first open position, and the damping hinge rotates forward rapidly; when the damping baffle rotates synchronously in the opposite direction with the damping shaft, the damping liquid pushes the blade to swing in the forward direction until the side of the blade opposite to the first limiting structure and the second limiting structure conflicts with the second limiting structure, so that the damping valve is stabilized in the second open position, and the damping hinge reverses slowly; the first limiting structure and the second limiting structure can be located on the same side of the hinge shaft, or on both sides of the hinge shaft respectively, and the first limiting structure can also be located in a plane where the blade rotates to be perpendicular to the damping baffle.

[0020] Preferably, the first limiting structure is configured as two protrusions, the two protrusions are located on the same straight line and the straight line is parallel to the hinge axis, and the two protrusions are respectively located on two opposite sides of the damping valve; or the first limiting structure is a columnar structure, the columnar structure is parallel to the hinge axis, and the two ends of the columnar structure are respectively connected to the two opposite sides of the damping valve. With this structure, the first limiting structure can simultaneously contact the two opposite ends of the blade, ensuring that the force of the first limiting structure on the blade can be balanced with the thrust of the damping fluid on the blade, so that the damping valve is stably in the first open gear.

[0021] Preferably, the second limiting structure is configured as two protrusions, the two protrusions are located on the same straight line and the straight line is parallel to the hinge axis, and the two protrusions are respectively located on two opposite sides of the damping valve; or the second limiting structure is a columnar structure, the columnar structure is parallel to the hinge axis, and the two ends of the columnar structure are respectively connected to the two opposite sides of the damping valve. With this structure, the second limiting structure can simultaneously contact the two opposite ends of the blade, ensuring that the force of the second limiting structure on the blade can be balanced with the thrust of the damping fluid on the blade, so that the damping valve is stably in the second open gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the damping hinge of the present invention.

[0023] Figure 2 It is an exploded view of Example 1 of the damping hinge of the present invention.

[0024] Figure 3 for Figure 2 AA direction cross-sectional view.

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the damping hinge in Example 2 of the damping hinge of the present invention.

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the damping hinge in Example 3 of the damping hinge of the present invention.

[0027] Figure 6 It is a schematic diagram of the cross-sectional structure of the damping hinge in Example 4 of the damping hinge of the present invention.

[0028] Figure 7 This is a schematic diagram of the internal structure of the damping hinge in Example 5 of the damping hinge of the present invention.

[0029] Figure 8 It is a schematic diagram of the side sectional structure of the damping valve in Example 5 of the damping hinge of the present invention.

[0030] Fig. 9 It is a schematic diagram of the side sectional structure of the damping valve in Example 6 of the damping hinge of the present invention.

[0031] Fig.10 It is a schematic diagram of the side sectional structure of the damping valve in Example 7 of the damping hinge of the present invention.

[0032] As shown in the figure: 1. outer shell, 2. front end cover, 3. rear end cover, 4. oil separator ring, 5. damping shaft, 6. damping baffle, 6-1. damping valve, 6-2. first limiting structure, 6-3. second limiting structure, 6-4. hinge pin, 6-5. blade, 7. connector. DETAILED DESCRIPTION

[0033] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0034] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0035] It should also be understood that the terms "comprises", "having", "includes", "comprising", when used in this specification, indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof. In addition, when a statement such as "...at least one" appears after a list of listed features, it modifies the entire listed features rather than modifying the individual elements in the list.

[0036] Embodiment 1:

[0037] like Figure 1 and Figure 2 As shown in, the damping hinge of this embodiment includes a cylindrical shell, in which a damping shaft 5 is arranged and filled with damping fluid, the shell includes an outer shell 1 and a front end cover 2 and a rear end cover 3 respectively located on the front and rear sides of the outer shell 1, the outer shell 1 and the rear end cover 3 are an integral structure, the front end cover 2 is welded to the outer shell 1, and can also be connected by thread or snap connection, the middle of the front end cover 2 and the rear end cover 3 are both provided with connecting holes, the front and rear ends of the damping shaft 5 are both sleeved with oil separator rings 4, the inner rings of the front and rear oil separator rings 4 are both interference fit with the damping shaft 5, and the front and rear ends of the damping shaft 5 are The two ends respectively pass through the oil separator ring 4 and are rotatably connected to the connecting holes on the front end cover 2 and the rear end cover 3. The outer rings of the oil separator rings 4 are interference fit with the outer shell 1. The damping fluid in the shell is sealed by the oil separator ring 4 and will not leak out from the connecting holes of the front end cover 2 and the rear end cover 3 along the outer shell 1 or the damping shaft 5. A connecting head 7 is provided at the front end of the damping shaft 5. The connecting head 7 passes through the connecting hole of the front end cover 2 and is exposed to the outside. An external thread for external connection is provided on the connecting head 7. A keyway or a buckle can also be provided on the connecting head 7 according to the object of external connection.

[0038] like Figure 2 and 3 As shown in , three damping baffles 6 are arranged on the damping shaft 5. The damping shaft 5 is driven to rotate and can drive the damping baffles 6 to rotate synchronously. Two damping valves 6-1 are arranged on each damping baffle 6; a blade 6-5 is hinged on the damping valve 6-1. The blade 6-5 is hinged in the damping valve 6-1 through a hinge pin 6-4. The hinge pin 6-4 is the hinge axis of the blade 6-5. The hinge pin 6-4 is parallel to the damping shaft 5 and is located in the middle of the blade 6-5; two strip structures of different lengths are arranged on the damping valve 6-1. The two strip structures are respectively located on the front and rear sides of the damping valve 6-1, and are both located on the side opposite to the hinge pin 6-4 and the damping shaft 5. One side of the blade 6-5 is opposite to the two strip structures, and this side of the blade 6-5 is set as abutment surface. The front and rear sides of the damping valve 6-1 described in this application correspond to the front and rear sides of the damping baffle 6, respectively.

[0039] One of the longer strip structures has one end connected to the inner side wall of the damping valve 6-1, and the other end is set as a first limiting structure 6-2, the first limiting structure 6-2 is opposite to the abutting surface of the blade 6-5, and the first limiting structure 6-2 is used to contact the abutting surface of the blade 6-5 when the blade 6-5 rotates toward the first limiting structure 6-2, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear. Another shorter strip structure has one end also connected to the inner side wall of the damping valve 6-1, and the other end is set as a second limiting structure 6-3, the second limiting structure 6-3 is opposite to the abutting surface of the blade 6-5, and is used to contact the abutting surface of the blade 6-5 when the blade 6-5 rotates toward the second limiting structure 6-3, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. The distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. When the blade 6-5 abuts against the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is larger, and when the blade 6-5 abuts against the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is smaller.

[0040] That is to say, when the damping valve 6-1 is in the first open gear, the opening degree of the damping valve 6-1 is large, the flow channel is large, and the flow rate of the damping liquid through the damping valve 6-1 per unit time is large, so that the blocking force of the damping liquid on the damping baffle 6-1 is weakened, and the damping force inside the damping hinge is small, presenting a weak damping state; and when the damping valve 6-1 is in the second open gear, the opening degree of the damping valve 6-1 is small, the flow channel is small, and the flow rate of the damping liquid through the damping valve 6-1 per unit time is also small, so that the degree of weakening of the blocking force of the damping liquid on the damping baffle 6-1 is small, and the damping force inside the damping hinge is large, presenting a strong damping state.

[0041] The working principle of the damping hinge of this embodiment is: when the damping shaft 5 is driven to rotate, the damping baffle 6 rotates and the damping fluid generates a blocking force on the damping baffle 6, so that the damping fluid generates a reverse flow relative to the damping baffle 6. The damping fluid exerts a thrust on the blade 6-5 on the damping valve 6-1. Due to the centrifugal force principle, the thrust of the damping fluid on the side of the blade 6-5 away from the damping shaft 5 is greater than the thrust of the damping fluid on the side of the blade 6-5 close to the damping shaft 5. Therefore, the damping fluid can push the blade 6-5 on the damping valve 6-1 to rotate and open the damping valve 6-1. The forward or backward rotation of the blade 6-5 around the hinge pin 6-4 is controlled by the flow direction of the damping fluid relative to the damping baffle 6. Figure 3Taking the structure in as an example, when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid counterclockwise rotation; when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow clockwise rotation at this time; set the damping shaft 5 to rotate counterclockwise as forward rotation and clockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0042] In this embodiment, the longer strip structure where the first limiting structure 6-2 is located can be set with only one strip, which is opposite to one end of the hinge pin 6-4 or the middle part of the hinge pin 6-4. In this way, the first limiting structure 6-2 has only one contact point with the abutment surface of the blade 6-5. The strip structure may not be set, and a protrusion opposite to the abutment surface of the blade 6-5 is directly set at the position of the first limiting structure 6-2 to replace the first limiting structure 6-2; the longer strip structure may also be set with two strips, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the first limiting structure 6-2 and the abutment surface of the blade 6-5 can have two contact points opposite to each other in the air. The strip structure may not be set, and two protrusions opposite to each other in the air are directly set at the position of the first limiting structure 6-2, and the two protrusions are opposite to the abutment surface of the blade 6-5. The first limiting structure 6-2 can also be set as a columnar structure. The first limiting structure 6-2 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the first limiting structure 6-2 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the first limiting structure 6-2 and the abutting surface of the blade 6-5 can achieve line contact.

[0043] Similarly, the shorter strip structure where the second limiting structure 6-3 is located can be set with only one strip, which is opposite to one end of the hinge pin 6-4 or the middle part of the hinge pin 6-4. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 have only one contact point. The strip structure may also be omitted, and a protrusion opposite to the abutment surface of the blade 6-5 may be directly set at the position of the second limiting structure 6-3 to replace the second limiting structure 6-3; the shorter strip structure may also be set with two strips, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 may have two contact points opposite to each other in the air. The strip structure may also be omitted, and two protrusions opposite to each other in the air may be directly set at the position of the second limiting structure 6-3, and the two protrusions are opposite to the abutment surface of the blade 6-5. The second limiting structure 6-3 can also be set as a columnar structure. The second limiting structure 6-3 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the second limiting structure 6-3 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 can achieve line contact.

[0044] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 can prevent the blade 6-5 from rotating to a plane that is coincident with or parallel to the damping baffle 6, so that the blade 6-5 can only swing back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the damping valve is normally open, and the damping hinge can be easily rotated forward or reversed. In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side opposite to the hinge pin 6-4 and the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches the maximum, the damping force inside the damping hinge is the minimum, and when the damping hinge changes the direction of rotation, the internal damping force will first decrease and then increase. As a variation of this embodiment, the longer strip structure can be appropriately extended so that the first limiting structure 6-2 is located on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. In this way, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the direction of rotation, the internal damping force will gradually decrease or increase.

[0045] The damping valve 6-1 of this embodiment is a structure arranged on the damping baffle 6. The damping change is completely controlled by the flow direction of the damping fluid and does not require the help of spring control. It has a simple structure, reliable operation, and low manufacturing cost. All parts of the damping hinge are in the shell and have a long service life.

[0046] Embodiment 2:

[0047] like Figure 4 As shown in , the difference between the damping hinge in this embodiment and the embodiment 1 is that the two strip structures of different lengths provided on the damping valve 6-1 are respectively located at the front and rear sides of the damping valve 6-1, and are both located at the side of the hinge pin 6-4 opposite to the damping shaft 5. One side surface of the blade 6-5 is opposite to both the strip structures and also opposite to the damping shaft 5, and this side surface of the blade 6-5 is set as an abutment surface.

[0048] The longer strip structure provided on the damping valve 6-1 has one end connected to the inner side wall of the damping valve 6-1 and the other end provided as a first limiting structure 6-2, the first limiting structure 6-2 is opposite to the abutting surface of the blade 6-5, the first limiting structure 6-2 is used to abut against the abutting surface of the blade 6-5 when the blade 6-5 rotates toward the first limiting structure 6-2, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear. Another shorter strip structure has one end also connected to the inner side wall of the damping valve 6-1, and the other end provided as a second limiting structure 6-3, the second limiting structure 6-3 is opposite to the abutting surface of the blade 6-5, and is used to abut against the abutting surface of the blade 6-5 when the blade 6-5 rotates toward the second limiting structure 6-3, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. The distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. When the blade 6-5 abuts against the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is larger, and the liquid flow channel is also larger. When the blade 6-5 abuts against the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is smaller, and the liquid flow channel is also smaller.

[0049] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 can prevent the blade 6-5 from rotating to a plane that is coincident with or parallel to the damping baffle 6, so that the blade 6-5 can only swing back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the damping valve is normally open, and the damping hinge can be conveniently rotated forward or reversed. In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side opposite to the hinge pin 6-4 and the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches the maximum, the damping force inside the damping hinge is the minimum, and when the damping hinge changes the direction of rotation, the internal damping force will first decrease and then increase. As a variation of this embodiment, the longer strip structure can be appropriately extended so that the first limiting structure 6-2 is located on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. In this way, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the direction of rotation, the internal damping force will gradually decrease or increase.

[0050] In this embodiment, the longer strip structure where the first limiting structure 6-2 is located can be set with only one strip, which is opposite to one end of the hinge pin 6-4 or the middle part of the hinge pin 6-4. The first limiting structure 6-2 has only one contact point with the abutment surface of the blade 6-5. The strip structure may not be set, and a protrusion opposite to the abutment surface of the blade 6-5 is directly set at the position of the first limiting structure 6-2 to replace the first limiting structure 6-2; the longer strip structure may also be set with two strips, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the first limiting structure 6-2 and the abutment surface of the blade 6-5 can have two contact points opposite to each other in the air. The strip structure may not be set, and two protrusions opposite to each other in the air are directly set at the position of the first limiting structure 6-2, and the two protrusions are opposite to the abutment surface of the blade 6-5. The first limiting structure 6-2 can also be set as a columnar structure. The first limiting structure 6-2 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the first limiting structure 6-2 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the first limiting structure 6-2 and the abutting surface of the blade 6-5 can achieve line contact.

[0051] Similarly, the shorter strip structure where the second limiting structure 6-3 is located can be set with only one strip, which is opposite to one end of the hinge pin 6-4 or the middle part of the hinge pin 6-4. The second limiting structure 6-3 has only one contact point with the abutment surface of the blade 6-5. The strip structure may not be set, and a protrusion opposite to the abutment surface of the blade 6-5 is directly set at the position of the second limiting structure 6-3 to replace the second limiting structure 6-3; the shorter strip structure may also be set with two strips, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 can have two contact points opposite to each other in the air. The strip structure may not be set, and two protrusions opposite to each other in the air are directly set at the position of the second limiting structure 6-3, and the two protrusions are opposite to the abutment surface of the blade 6-5. The second limiting structure 6-3 can also be set as a columnar structure. The second limiting structure 6-3 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the second limiting structure 6-3 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 can achieve line contact.

[0052] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 is driven to rotate, the damping baffle 6 rotates, and the damping fluid generates a blocking force on the damping baffle 6, so that the damping fluid generates a reverse flow relative to the damping baffle 6, and the damping fluid has a thrust on the blade 6-5 on the damping valve 6-1. Due to the principle of centrifugal force, the thrust of the damping fluid on the side of the blade 6-5 away from the damping shaft 5 is greater than the thrust of the damping fluid on the side of the blade 6-5 close to the damping shaft 5, so that Figure 4 Taking the structure in as an example, when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid counterclockwise rotation; when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow clockwise rotation at this time; set the damping shaft 5 counterclockwise rotation as forward rotation and clockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0053] Embodiment 3:

[0054] like Figure 5As shown in , the difference between the damping hinge in this embodiment and embodiments 1 and 2 is that two protrusions are provided on one side (front side or rear side) of the damping valve 6-1, which are the first limiting structure 6-2 and the second limiting structure 6-3 respectively, and the two side surfaces of the blade 6-5 are respectively opposite to the first limiting structure 6-2 and the second limiting structure 6-3, and the two side surfaces are respectively the first gear abutment surface and the second gear abutment surface, and the distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4.

[0055] When the blade 6-5 rotates toward the first limiting structure 6-2, the first limiting structure 6-2 contacts the first gear abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear; when the blade 6-5 rotates toward the second limiting structure 6-3, the second limiting structure 6-3 contacts the second gear abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. When the blade 6-5 contacts the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is large, and the liquid flow channel is also large, while when the blade 6-5 contacts the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is small, and the liquid flow channel is also small.

[0056] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 can prevent the blade 6-5 from rotating to a plane that is coincident with or parallel to the damping baffle 6, so that the blade 6-5 can only swing back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the damping valve is normally open, and the damping hinge can be easily rotated forward or reversed. In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side opposite to the hinge pin 6-4 and the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes its rotation direction, the internal damping force will gradually decrease or increase. The first limiting structure 6-2 can also be set on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. In this way, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches its maximum, and the damping force inside the damping hinge is the smallest. When the damping hinge changes its rotation direction, the internal damping force will first decrease and then increase.

[0057] In this embodiment, only one convex column can be set where the first limiting structure 6-2 is located, which is opposite to one end of the hinge pin 6-4. The first limiting structure 6-2 has only one contact point with the abutment surface of the blade 6-5. The first limiting structure 6-2 can also be set as a strip structure, one end of which is connected to the inner wall of the damping valve 6-1, and the first limiting structure 6-2 is at the other end of the strip structure; the first limiting structure 6-2 can also be provided with two convex columns, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the first limiting structure 6-2 can have two contact points with the abutment surface of the blade 6-5 in the air. The first limiting structure 6-2 can also be set as two strip structures, which are respectively opposite to the two ends of the hinge pin 6-4. On the two strip structures, one of the ends is connected to the inner wall of the damping valve 6-1, and the first limiting structure 6-2 is set at the other end. The first limiting structure 6-2 can also be set as a columnar structure. The first limiting structure 6-2 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the first limiting structure 6-2 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the first limiting structure 6-2 and the abutting surface of the blade 6-5 can achieve line contact.

[0058] Similarly, only one convex column can be set where the second limiting structure 6-3 is located, which is opposite to one end of the hinge pin 6-4. The second limiting structure 6-3 has only one contact point with the abutment surface of the blade 6-5. The second limiting structure 6-3 can also be set as a strip structure, one end of which is connected to the inner wall of the damping valve 6-1, and the second limiting structure 6-3 is at the other end of the strip structure; the second limiting structure 6-3 can also be provided with two convex columns, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the second limiting structure 6-3 can have two contact points with the abutment surface of the blade 6-5 that are opposite to each other in the air. The second limiting structure 6-3 can also be set as two strip structures, which are respectively opposite to the two ends of the hinge pin 6-4. On the two strip structures, one of the ends is connected to the inner wall of the damping valve 6-1, and the second limiting structure 6-3 is set at the other end. The second limiting structure 6-3 can also be set as a columnar structure. The second limiting structure 6-3 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the second limiting structure 6-3 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the second limiting structure 6-3 and the abutment surface of the blade 6-5 can achieve line contact.

[0059] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 is driven to rotate, the damping baffle 6 rotates, and the damping fluid generates a blocking force on the damping baffle 6, so that the damping fluid generates a reverse flow relative to the damping baffle 6, and the damping fluid has a thrust on the blade 6-5 on the damping valve 6-1. Due to the principle of centrifugal force, the thrust of the damping fluid on the side of the blade 6-5 away from the damping shaft 5 is greater than the thrust of the damping fluid on the side of the blade 6-5 close to the damping shaft 5, so that Figure 5 Taking the structure in as an example, when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the first gear abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid clockwise rotation; when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the second gear abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow counterclockwise rotation at this time; set the damping shaft 5 clockwise rotation as forward rotation and counterclockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0060] Embodiment 4:

[0061] like Figure 6 As shown in , the difference between the damping hinge in this embodiment and embodiment 3 is that two protrusions are provided on one side (front side or rear side) of the damping valve 6-1, which are the first limiting structure 6-2 and the second limiting structure 6-3 respectively, and one side surface of the blade 6-5 is opposite to both the first limiting structure 6-2 and the second limiting structure 6-3, and this side surface is abutting surface, and the distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4.

[0062] When the blade 6-5 rotates toward the first limiting structure 6-2, the first limiting structure 6-2 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear; when the blade 6-5 rotates toward the second limiting structure 6-3, the second limiting structure 6-3 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. When the blade 6-5 contacts the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is large, and the liquid flow channel is also large, while when the blade 6-5 contacts the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is small, and the liquid flow channel is also small.

[0063] In this embodiment, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the blade 6-5 can swing to a plane that coincides with or is parallel to the damping baffle 6. Even if the damping valve 6-1 is closed, when the damping valve 6-1 is closed, the damping hinge can stop rotating by itself. In this way, by rotating the damping shaft 5 to any angle and then rotating it in the opposite direction, the damping hinge can stop and maintain the current state.

[0064] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side of the hinge pin 6-4 opposite to the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane where the blade 6-5 is perpendicular to the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches its maximum and the damping force inside the damping hinge is minimum. When the damping hinge changes its rotation direction, the blade 6-5 changes from rotating toward the second limiting structure 6-3 to rotating toward the first limiting structure 6-2, and the internal damping force will experience a process of increasing, decreasing, and increasing. When the blade 6-5 changes from rotating toward the first limiting structure 6-2 to rotating toward the second limiting structure 6-3, the internal damping force will experience a process of decreasing, increasing, and decreasing. The first limiting structure 6-2 can also be set on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. In this way, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the rotation direction, the internal damping force will first increase and then decrease.

[0065] In this embodiment, only one convex column can be set where the first limiting structure 6-2 is located, which is opposite to one end of the hinge pin 6-4. The first limiting structure 6-2 has only one contact point with the abutment surface of the blade 6-5. Alternatively, a strip structure can be set, which is opposite to one end of the hinge pin 6-4. One end of the strip structure is set as the first limiting structure 6-2, and the other end is set as the second limiting structure 6-3. The first limiting structure 6-2 can also be provided with two convex columns, which are respectively opposite to the two ends of the hinge pin 6-4. In this way, the first limiting structure 6-2 and the abutment surface of the blade 6-5 can have two contact points opposite to each other in the air. Alternatively, two strip structures can be set, which are respectively opposite to the two ends of the hinge pin 6-4. On the two strip structures, one end is set as the first limiting structure 6-2, and the other end is set as the second limiting structure 6-3. The first limiting structure 6-2 can also be set as a columnar structure. The first limiting structure 6-2 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the first limiting structure 6-2 are respectively connected to the opposite sides of the damping valve 6-1. In this way, the first limiting structure 6-2 and the abutting surface of the blade 6-5 can achieve line contact.

[0066] Similarly, the second limiting structure 6-3 may be provided with only one convex column, which is opposite to one end of the hinge pin 6-4, and the second limiting structure 6-3 has only one contact point with the abutting surface of the blade 6-5; the second limiting structure 6-3 may also be provided with two convex columns, which are opposite to the two ends of the hinge pin 6-4 respectively, so that the second limiting structure 6-3 and the abutting surface of the blade 6-5 may have two contact points opposite to each other in the air. The second limiting structure 6-3 may also be provided as a columnar structure, and the second limiting structure 6-3 of the columnar structure is parallel to the hinge pin 6-4, and the two ends of the second limiting structure 6-3 are respectively connected to the two opposite sides in the damping valve 6-1, so that the second limiting structure 6-3 and the abutting surface of the blade 6-5 can achieve line contact.

[0067] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 is driven to rotate, the damping baffle 6 rotates, and the damping fluid generates a blocking force on the damping baffle 6, so that the damping fluid generates a reverse flow relative to the damping baffle 6, and the damping fluid has a thrust on the blade 6-5 on the damping valve 6-1. Due to the principle of centrifugal force, the thrust of the damping fluid on the side of the blade 6-5 away from the damping shaft 5 is greater than the thrust of the damping fluid on the side of the blade 6-5 close to the damping shaft 5, so that Figure 6 Taking the structure in as an example, when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid counterclockwise rotation; when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow clockwise rotation at this time; set the damping shaft 5 counterclockwise rotation as forward rotation and clockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0068] Embodiment 5:

[0069] like Figure 7 and Figure 8As shown in , the difference between the damping hinge in this embodiment and the embodiments 1, 2, 3 and 4 is that the hinge pin 6-4 of the blade 6-5 and the damping valve 6-1 is perpendicular to the damping shaft 5, the area of ​​the blade 6-5 on one side of the hinge pin 6-4 is larger than the area of ​​the blade 6-5 on the other side of the hinge pin 6-4, and a columnar structure is respectively provided on the front and rear sides of the damping valve 6-1, and the two columnar structures are parallel to the hinge pin 6-4, and the two ends of the two columnar structures are respectively connected to the opposite sides of the damping valve 6-1, and the damping valve 6-1 is provided with a columnar structure. One of the columnar structures is the first limiting structure 6-2, and the other columnar structure is the second limiting structure 6-3. The first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side of the hinge pin 6-4 opposite to the damping shaft 5. The two side surfaces of the blade 6-5 are respectively opposite to the first limiting structure 6-2 and the second limiting structure 6-3. The two side surfaces are respectively the first gear abutment surface and the second gear abutment surface. The distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4.

[0070] When the blade 6-5 rotates toward the first limiting structure 6-2, the first limiting structure 6-2 contacts the first gear abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear; when the blade 6-5 rotates toward the second limiting structure 6-3, the second limiting structure 6-3 contacts the second gear abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. When the blade 6-5 contacts the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is large, and the liquid flow channel is also large, while when the blade 6-5 contacts the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is small, and the liquid flow channel is also small.

[0071] In this embodiment, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the blade 6-5 can swing to a plane that coincides with or is parallel to the damping baffle 6. Even if the damping valve 6-1 is closed, when the damping valve 6-1 is closed, the damping hinge can stop rotating by itself. In this way, by rotating the damping shaft 5 to any angle and then rotating it in the opposite direction, the damping hinge can stop and maintain the current state.

[0072] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side of the hinge pin 6-4 opposite to the damping shaft 5. The first limiting structure 6-2 and the second limiting structure 6-3 can prevent the blade 6-5 from rotating to a plane perpendicular to the damping baffle 6. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the rotation direction, the internal damping force will first increase and then decrease. The first limiting structure 6-2 can also be set on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4, so that when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches its maximum and the damping force inside the damping hinge is the minimum. When the damping hinge changes its rotation direction, the blade 6-5 changes from rotating toward the second limiting structure 6-3 to rotating toward the first limiting structure 6-2, and the internal damping force will experience a process of increasing, decreasing, and increasing. When the blade 6-5 changes from rotating toward the first limiting structure 6-2 to rotating toward the second limiting structure 6-3, the internal damping force will experience a process of decreasing, increasing, and decreasing.

[0073] In this embodiment, the first limiting structure 6-2 is set as a columnar structure, so that the first limiting structure 6-2 can achieve line contact with the abutting surface of the blade 6-5. A convex block can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the first limiting structure 6-2, so that the first limiting structure 6-2 has only one contact point with the first gear abutting surface of the blade 6-5. Two convex blocks facing each other in space can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the first limiting structure 6-2, so that the first limiting structure 6-2 can have two contact points facing each other in space with the first gear abutting surface of the blade 6-5.

[0074] Similarly, the second limiting structure 6-3 is set to a columnar structure so that the second limiting structure 6-3 and the abutting surface of the blade 6-5 can achieve line contact. A convex block can also be set at the position of the second limiting structure 6-3 of the columnar structure on the inner side wall of the damping valve 6-1, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 have only one contact point. Two convex blocks facing each other in space can also be set at the position of the second limiting structure 6-3 on the inner side wall of the damping valve 6-1, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 can have two contact points facing each other in space.

[0075] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 rotates, the damping fluid generates a blocking force on the damping baffle 6, and the thrust of the damping fluid on the larger area of ​​the blade 6-5 on the side of the hinge pin 6-4 is greater than the thrust of the damping fluid on the smaller area of ​​the blade on the other side of the hinge pin 6-4. This can avoid the problem of the blade 6-5's rotation direction being uncertain due to the force balance at both ends. Figure 8 Taking the structure in as an example, when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the first gear abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid counterclockwise rotation; when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the second gear abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow clockwise rotation at this time; set the damping shaft 5 to rotate counterclockwise as forward rotation and clockwise as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0076] Embodiment 6:

[0077] like Fig. 9 As shown in , the difference between the damping hinge in this embodiment and embodiment 5 is that one side of the blade 6-5 is opposite to the first limiting structure 6-2 and the second limiting structure 6-3, and at the same time, this side is opposite to the damping shaft 5, and this side of the blade 6-5 is set as a supporting surface.

[0078] When the blade 6-5 rotates toward the first limiting structure 6-2, the first limiting structure 6-2 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear; when the blade 6-5 rotates toward the second limiting structure 6-3, the second limiting structure 6-3 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. The distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. When the blade 6-5 contacts the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is larger, and the liquid flow channel is also larger. When the blade 6-5 contacts the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is smaller, and the liquid flow channel is also smaller.

[0079] In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 can prevent the blade 6-5 from rotating to a plane that is coincident with or parallel to the damping baffle 6, so that the blade 6-5 can only swing back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the damping valve is normally open, and the damping hinge can be easily rotated forward or reversed. In this embodiment, the first limiting structure 6-2 and the second limiting structure 6-3 are both located on the side opposite to the hinge pin 6-4 and the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches the maximum, the damping force inside the damping hinge is the minimum, and when the damping hinge changes the direction of rotation, the internal damping force will first decrease and then increase. The first limiting structure 6-2 can be set on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. In this way, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the rotation direction, the internal damping force will gradually decrease or increase.

[0080] In this embodiment, the first limiting structure 6-2 is set as a columnar structure, so that the first limiting structure 6-2 can achieve line contact with the abutting surface of the blade 6-5. A convex block can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the first limiting structure 6-2, so that the first limiting structure 6-2 has only one contact point with the first gear abutting surface of the blade 6-5. Two convex blocks facing each other in space can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the first limiting structure 6-2, so that the first limiting structure 6-2 can have two contact points facing each other in space with the first gear abutting surface of the blade 6-5.

[0081] Similarly, the second limiting structure 6-3 is set to a columnar structure so that the second limiting structure 6-3 and the abutting surface of the blade 6-5 can achieve line contact. A convex block can also be set at the position of the second limiting structure 6-3 of the columnar structure on the inner side wall of the damping valve 6-1, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 have only one contact point. Two convex blocks facing each other in space can also be set at the position of the second limiting structure 6-3 on the inner side wall of the damping valve 6-1, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 can have two contact points facing each other in space.

[0082] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 rotates, the damping fluid generates a blocking force on the damping baffle 6, and the thrust of the damping fluid on the larger area of ​​the blade 6-5 on the side of the hinge pin 6-4 is greater than the thrust of the damping fluid on the smaller area of ​​the blade on the other side of the hinge pin 6-4. This can avoid the problem of the blade 6-5's rotation direction being uncertain due to the force balance at both ends. Fig. 9 Taking the structure in as an example, when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid clockwise rotation; when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow counterclockwise rotation at this time; set the damping shaft 5 clockwise rotation as forward rotation and counterclockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0083] Embodiment 7:

[0084] like Fig.10 As shown in , the difference between the damping hinge in this embodiment and embodiments 5 and 6 is that two columnar structures are provided on one side (front side or rear side) of the damping valve 6-1, and the two columnar structures are parallel to the hinge pin 6-4, and the two ends of the two columnar structures are respectively connected to the opposite sides inside the damping valve 6-1, one of the columnar structures is the first limiting structure 6-2, and the other columnar structure is the second limiting structure 6-3, and one side surface of the blade 6-5 is opposite to both the first limiting structure 6-2 and the second limiting structure 6-3, and this side surface is abutting surface, and the distance between the first limiting structure 6-2 and the hinge pin 6-4 is smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4.

[0085] When the blade 6-5 rotates toward the first limiting structure 6-2, the first limiting structure 6-2 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the first open gear; when the blade 6-5 rotates toward the second limiting structure 6-3, the second limiting structure 6-3 contacts the abutting surface of the blade 6-5, so that the blade 6-5 is limited, and the damping valve 6-1 is stably in the second open gear. When the blade 6-5 contacts the first limiting structure 6-2, the angle between the blade 6-5 and the damping baffle 6 is large, and the liquid flow channel is also large, while when the blade 6-5 contacts the second limiting structure 6-3, the angle between the blade 6-5 and the damping baffle 6 is small, and the liquid flow channel is also small.

[0086] In this embodiment, when the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3 around the hinge pin 6-4, the blade 6-5 can swing to a plane that coincides with or is parallel to the damping baffle 6. Even if the damping valve 6-1 is closed, when the damping valve 6-1 is closed, the damping hinge can stop rotating by itself. In this way, by rotating the damping shaft 5 to any angle and then rotating it in the opposite direction, the damping hinge can stop and maintain the current state.

[0087] In this embodiment, the first limiting structure 6-2 is located on the side of the hinge pin 6-4 opposite to the damping shaft 5, and the second limiting structure 6-3 is located on the side of the hinge pin 6-4 opposite to the damping shaft 5. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will not pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the damping hinge changes the rotation direction, the internal damping force will first increase and then decrease. The first limiting structure 6-2 can also be set on the side of the hinge pin 6-4 opposite to the damping shaft 5, but the distance between the first limiting structure 6-2 and the hinge pin 6-4 is still smaller than the distance between the second limiting structure 6-3 and the hinge pin 6-4. When the blade 6-5 swings back and forth between the first limiting structure 6-2 and the second limiting structure 6-3, it will pass through the plane perpendicular to the blade 6-5 and the damping baffle 6. When the blade 6-5 is perpendicular to the damping baffle 6, the liquid flow channel reaches the maximum and the damping force inside the damping hinge is the minimum. When the damping hinge changes the rotation direction, the blade 6-5 changes from rotating toward the second limiting structure 6-3 to rotating toward the first limiting structure 6-2, and the internal damping force will experience a process of increasing, decreasing, and increasing. When the blade 6-5 changes from rotating toward the first limiting structure 6-2 to rotating toward the second limiting structure 6-3, the internal damping force will experience a process of decreasing, increasing, and decreasing.

[0088] In this embodiment, the first limiting structure 6-2 is set as a columnar structure, so that the first limiting structure 6-2 can achieve line contact with the abutting surface of the blade 6-5. A convex block can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the first limiting structure 6-2, so that the first limiting structure 6-2 has only one contact point with the first gear abutting surface of the blade 6-5. Two convex blocks facing each other in space can also be set at the position where the first limiting structure 6-2 of the columnar structure on the inner side wall of the damping valve 6-1 is located, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the first limiting structure 6-2, so that the first limiting structure 6-2 can have two contact points facing each other in space with the first gear abutting surface of the blade 6-5.

[0089] Similarly, the second limiting structure 6-3 is set to a columnar structure so that the second limiting structure 6-3 and the abutting surface of the blade 6-5 can achieve line contact. A convex block can also be set at the position of the second limiting structure 6-3 of the columnar structure on the inner side wall of the damping valve 6-1, and the convex block is opposite to the middle part of the hinge pin 6-4, and the end of the convex block is the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 have only one contact point. Two convex blocks facing each other in space can also be set at the position of the second limiting structure 6-3 on the inner side wall of the damping valve 6-1, and the two convex blocks are opposite to the middle part of the hinge pin 6-4, and the ends of the two convex blocks are the second limiting structure 6-3, so that the second limiting structure 6-3 and the second gear abutting surface of the blade 6-5 can have two contact points facing each other in space.

[0090] The working principle of the damping hinge of this embodiment is that when the damping shaft 5 rotates, the damping fluid generates a blocking force on the damping baffle 6, and the thrust of the damping fluid on the larger area of ​​the blade 6-5 on the side of the hinge pin 6-4 is greater than the thrust of the damping fluid on the smaller area of ​​the blade on the other side of the hinge pin 6-4. This can avoid the problem of the blade 6-5's rotation direction being uncertain due to the force balance at both ends. Fig.10 Taking the structure in as an example, when the damping shaft 5 rotates clockwise, the damping fluid pushes the blade 6-5 to rotate counterclockwise until the abutting surface of the blade 6-5 conflicts with the first limiting structure 6-2, so that the damping valve 6-1 is in the first open gear, and the damping hinge can achieve rapid clockwise rotation; when the damping shaft 5 rotates counterclockwise, the damping fluid pushes the blade 6-5 to rotate clockwise until the abutting surface of the blade 6-5 conflicts with the second limiting structure 6-3, so that the damping valve 6-1 is in the second open gear, and the damping hinge can achieve slow counterclockwise rotation at this time; set the damping shaft 5 clockwise rotation as forward rotation and counterclockwise rotation as reverse rotation, then the damping hinge of this embodiment can achieve the effect of rapid forward rotation and slow reverse rotation.

[0091] The above are only specific embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, they should all be included in the protection scope of the claims of the present invention.

Claims

1. A damping hinge, It is characterized in that The invention comprises a housing, wherein a damping shaft (5) is arranged in the housing and filled with damping fluid, at least two damping baffles (6) are arranged on the damping shaft (5), the damping shaft (5) can drive the damping baffles (6) to rotate, at least one damping valve (6-1) is arranged on the damping baffle (6), a blade (6-5) is hingedly connected to the damping valve (6-1), the damping fluid can push the blade (6-5) to rotate so that the damping valve (6-1) is opened, and a first limit valve is arranged on the damping valve (6-1). The invention relates to a first limit structure (6-2) and a second limit structure (6-3), wherein the first limit structure (6-2) is used to limit the rotation of the blade (6-5) when the damping shaft (5) rotates forward, so that the damping valve (6-1) is in a first open gear position, and the second limit structure (6-3) is used to limit the rotation of the blade (6-5) when the damping shaft (5) rotates reversely, so that the damping valve (6-1) is in a second open gear position, and the liquid flow channel of the first open gear position is larger than the liquid flow channel of the second open gear position.

2. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is parallel to the damping axis (5), the hinge axis is located in the middle of the blade (6-5), the blade (6-5) can swing bidirectionally around its hinge axis, the first limiting structure (6-2) and the second limiting structure (6-3) are respectively located on the front and rear sides of the damping valve (6-1), the second limiting structure (6-3) is located on the side opposite to the hinge axis and the damping axis (5), one side surface of the blade (6-5) is opposite to both the first limiting structure (6-2) and the second limiting structure (6-3), and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

3. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is parallel to the damping axis (5), the hinge axis is located in the middle of the blade (6-5), the blade (6-5) can swing bidirectionally around its hinge axis, the first limiting structure (6-2) and the second limiting structure (6-3) are respectively located at the front and rear sides of the damping valve (6-1), the second limiting structure (6-3) is located on the side opposite to the hinge axis and the damping axis (5), one side surface of the blade (6-5) is opposite to both the first limiting structure (6-2) and the second limiting structure (6-3), and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

4. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is parallel to the damping axis (5), the hinge axis is located in the middle of the blade (6-5), the blade (6-5) can swing bidirectionally around its hinge axis, the first limiting structure (6-2) and the second limiting structure (6-3) are both located at the front side or the rear side of the damping valve (6-1), the two side surfaces of the blade (6-5) are respectively opposite to the first limiting structure (6-2) and the second limiting structure (6-3), and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

5. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is parallel to the damping axis (5), the hinge axis is located in the middle of the blade (6-5), the blade (6-5) can swing bidirectionally around its hinge axis, the first limiting structure (6-2) and the second limiting structure (6-3) are both located on the front side or the rear side of the damping valve (6-1), one side surface of the blade (6-5) is opposite to the first limiting structure (6-2) and the second limiting structure (6-3), and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

6. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is perpendicular to the damping axis (5); the area of ​​the blade (6-5) on one side of the hinge axis is larger than the area of ​​the blade (6-5) on the other side of the hinge axis; the blade (6-5) can swing bidirectionally around its hinge axis; the first limiting structure (6-2) and the second limiting structure (6-3) are respectively located on the front and rear sides of the damping valve (6-1); the two side surfaces of the blade (6-5) are respectively opposite to the first limiting structure (6-2) and the second limiting structure (6-3); and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

7. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is perpendicular to the damping axis (5); the area of ​​the blade (6-5) on one side of the hinge axis is larger than the area of ​​the blade (6-5) on the other side of the hinge axis; the blade (6-5) can swing bidirectionally around its hinge axis; the first limiting structure (6-2) and the second limiting structure (6-3) are respectively located on the front and rear sides of the damping valve (6-1); one side surface of the blade (6-5) is opposite to both the first limiting structure (6-2) and the second limiting structure (6-3); and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

8. The damping hinge according to claim 1, It is characterized in that The hinge axis of the blade (6-5) and the damping valve (6-1) is perpendicular to the damping axis (5); the area of ​​the blade (6-5) on one side of the hinge axis is larger than the area of ​​the blade (6-5) on the other side of the hinge axis; the blade (6-5) can swing bidirectionally around its hinge axis; the first limiting structure (6-2) and the second limiting structure (6-3) are both located on the front side or the rear side of the damping valve (6-1); one side surface of the blade (6-5) is opposite to the first limiting structure (6-2) and the second limiting structure (6-3); and the distance between the first limiting structure (6-2) and the hinge axis is smaller than the distance between the second limiting structure (6-3) and the hinge axis.

9. The damping hinge according to any one of claims 2 to 8, It is characterized in that The first limiting structure (6-2) is configured as two protrusions, the two protrusions are located on the same straight line and the straight line is parallel to the hinge axis, and the two protrusions are respectively located on two opposite sides of the damping valve (6-1); or the first limiting structure (6-2) is a columnar structure, the columnar structure is parallel to the hinge axis, and two ends of the columnar structure are respectively connected to two opposite sides of the damping valve (6-1).

10. The damping hinge according to any one of claims 2 to 8, It is characterized in that The second limiting structure (6-3) is configured as two protrusions, the two protrusions are located on the same straight line and the straight line is parallel to the hinge axis, and the two protrusions are respectively located on two opposite sides of the damping valve (6-1); or the second limiting structure (6-3) is a columnar structure, the columnar structure is parallel to the hinge axis, and two ends of the columnar structure are respectively connected to two opposite sides of the damping valve (6-1).

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