Hinge mechanism and opening and closing equipment

Abstract

The utility model discloses a hinge mechanism and opening and closing equipment, the hinge mechanism comprises a first hinge seat, a second hinge seat and a connecting shaft, and a first hinge part of the first hinge seat is provided with a first matching structure; a second hinge part of the second hinge seat is rotatably connected with the first hinge part, the second hinge part is provided with a second containing cavity and a second opening, a piston with a second matching structure is arranged in the second containing cavity, and the second matching structure abuts against the first matching structure through the second opening; the connecting shaft penetrates through the first hinge part, the piston and the second hinge part so that the first hinge part and the second hinge part can be relatively fixed in the axial direction, a first limiting structure is arranged between the abutting faces of the first matching structure and the second matching structure, and the first limiting structure comprises a first limiting part and a second limiting part; the first limiting part and the second limiting part are in limiting fit. According to the hinge mechanism, initial state positioning of the hinge mechanism can be achieved, and the strength of the hinge mechanism is prevented from being affected.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of hinge mechanisms, and in particular, to a hinge mechanism and an opening / closing device. Background Art

[0002] A hinge mechanism is a device installed on a door body to realize the opening and closing of the door body. For example, the hinge mechanism installed on a freezer includes a fixed seat connected to the cabinet body, a rotating seat connected to the door body, and a core shaft passing through the fixed seat and the rotating seat. Some hinge mechanisms also include an elastic member.

[0003] In the related art, the initial state of the hinge mechanism is positioned by protrusions and grooves provided on the outer walls of the fixed seat and the rotating seat. After the hinge mechanism is used, the protrusions will fall off, which may reduce the strength of the fixed seat or the rotating seat, and also affect the overall appearance neatness and beauty of the hinge mechanism. Summary of the Utility Model

[0004] Embodiments of the present disclosure provide a hinge mechanism and an opening / closing device to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a hinge mechanism, including

[0006] A first hinge seat, including a first hinge portion, and the first hinge portion is provided with a first mating structure;

[0007] A second hinge seat, including a second hinge portion, the second hinge portion is rotatably connected to the first hinge portion, the second hinge portion is provided with a second accommodation cavity and a second opening, a piston is arranged in the second accommodation cavity, the piston has a second mating structure, and the second mating structure abuts against the first mating structure through the second opening;

[0008] A connecting shaft passes through the first hinge portion, the piston and the second hinge portion to axially fix the first hinge portion and the second hinge portion relative to each other. A first limiting structure is arranged between the abutting surfaces of the first mating structure and the second mating structure. The first limiting structure includes a first limiting portion located on the first mating structure and a second limiting portion located on the second mating structure. When the hinge mechanism is in the initial state, the first limiting portion and the second limiting portion are in limiting cooperation.

[0009] In some possible implementations, the second mating structure includes a first helical surface and a first top surface, the first mating structure includes a first mating surface and a second top surface, one end of the first top surface is connected to the top end of the first helical surface, the first helical surface and the first mating surface cooperate with each other, the first top surface and the second top surface correspond to each other, the first limiting portion is arranged on the second top surface, the second limiting portion is arranged on the first top surface, and when the hinge mechanism is in an open state, the first helical surface and the first mating surface abut against each other.

[0010] In some possible implementations, the first limiting portion is a protrusion, and the second limiting portion is a recessed portion matched with the protrusion; or, the first limiting portion is a recessed portion, and the second limiting portion is a protrusion matched with the recessed portion.

[0011] In some possible implementations, the diameter of the recessed portion is greater than or equal to the diameter of the raised portion.

[0012] In some possible implementations, the side wall of the piston is provided with an axially extending guide groove, the side wall of the second accommodating chamber is provided with a corresponding guide protrusion, and the guide protrusion is arranged in the guide groove; and / or,

[0013] The hinge mechanism further includes a fastener connected to both ends of the connecting shaft so as to relatively fix the first hinge seat and the second hinge seat in the axial direction; and / or,

[0014] The hinge mechanism further comprises a gasket, wherein the center of the gasket has a non-circular hole, and the end of the connecting shaft penetrates into the non-circular hole and is riveted to the gasket; or, the center of the gasket has a polygonal hole, and the end of the connecting shaft penetrates into the polygonal hole and is riveted to the gasket; and / or,

[0015] The piston is provided with a weight-reducing hole.

[0016] In some possible implementations, the hinge mechanism further includes an elastic member, which is disposed in the second accommodating cavity and located at an end of the piston away from the second matching structure, and the elastic member can provide assistance for the abutting state;

[0017] A first positioning protrusion is provided along the center of the bottom end of the piston, and the first positioning protrusion is used to position the elastic member; and / or,

[0018] A second positioning protrusion is provided along the center of the bottom end of the second accommodating cavity, and the second positioning protrusion is used to position the elastic member.

[0019] In some possible implementation manners, the first hinge seat further includes a first mounting portion for connecting with a door body of an opening and closing device, the second hinge seat further includes a second mounting portion for connecting with a box body of the opening and closing device, a first mounting hole is provided on the first mounting portion, and a second mounting hole is provided on the second mounting portion; and / or,

[0020] A first reinforcing rib is provided on the first mounting portion, and a second reinforcing rib is provided on the second mounting portion; and / or,

[0021] The first hinge portion and the first mounting portion are integrally formed, and the second hinge portion and the second mounting portion are integrally formed.

[0022] In some possible implementation manners, the first hinge seat further includes a first mounting portion for connecting with a door body of an opening and closing device, the second hinge seat further includes a second mounting portion for connecting with a box body of the opening and closing device, a reinforcing hole is further provided on the second hinge portion, and the reinforcing hole is docked with a reinforcing protrusion on the box body of the opening and closing device; and / or,

[0023] A first reinforcing rib is provided on the first mounting portion, and a second reinforcing rib is provided on the second mounting portion; and / or,

[0024] The first hinge portion and the first mounting portion are integrally formed, and the second hinge portion and the second mounting portion are integrally formed.

[0025] In some possible implementation manners, the hinge mechanism further includes a second limiting structure, the second limiting structure includes a limiting protrusion and a limiting groove, the limiting protrusion is provided on a side of the first mounting portion close to the second hinge portion, the limiting groove is provided on a surface of the second mounting portion facing away from the box body of the opening and closing device, and when the door body of the opening and closing device is at the maximum opening and closing angle, at least a part of the limiting protrusion is clamped and pressed in the limiting groove.

[0026] As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide an opening and closing device, including:

[0027] A box body having a box opening;

[0028] A door body, and the door body is hinged at the box opening of the box body through the hinge mechanism according to any one of the embodiments of the present disclosure.

[0029] The technical solution of the embodiments of the present disclosure can obtain the following beneficial effects: For this hinge mechanism, a first limiting structure is provided between the abutting surfaces of the first matching structure and the second matching structure. When the hinge mechanism is in the initial state, the first limiting portion and the second limiting portion are in limiting cooperation, in the hinge mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Exploded view of the hinge mechanism according to an embodiment of the present disclosure Figure 1 ;

[0031] Figure 2 Exploded view of the hinge mechanism according to an embodiment of the present disclosure Figure 2 ;

[0032] Figure 3 Schematic diagram of the head end structure of the piston according to an embodiment of the present disclosure;

[0033] Figure 4 Schematic diagram of the tail end structure of the piston according to an embodiment of the present disclosure;

[0034] Figure 5 Schematic diagram of the side view of the piston according to an embodiment of the present disclosure;

[0035] Figure 6 Schematic diagram of the perspective view of the first hinge seat according to an embodiment of the present disclosure;

[0036] Figure 7 Schematic diagram of the perspective view of the other side of the first hinge seat according to an embodiment of the present disclosure;

[0037] Figure 8 Schematic diagram of the perspective view of the second hinge seat according to an embodiment of the present disclosure;

[0038] Figure 9 Internal schematic diagram of the second hinge seat according to an embodiment of the present disclosure;

[0039] Figure 10 Schematic diagram of the gasket according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following further describes the content of the present utility model in detail with reference to the drawings and specific embodiments.

[0041] Figure 1 Exploded view of the hinge mechanism according to an embodiment of the present disclosure Figure 1 ; Figure 2 Exploded view of the hinge mechanism according to an embodiment of the present disclosure Figure 2 ; Figure 3 Schematic diagram of the head end structure of the piston according to an embodiment of the present disclosure; Figure 4 Schematic diagram of the tail end structure of the piston according to an embodiment of the present disclosure; Figure 5 Schematic diagram of the side view of the piston according to an embodiment of the present disclosure. Refer to Figures 1 to 5As shown in the figure, an embodiment of the present disclosure provides a hinge mechanism, which includes a first hinge seat 10, a second hinge seat 20, and a connecting shaft 40. Specifically, the first hinge seat 10 includes a first hinge portion 11, and the first hinge portion 11 is provided with a first mating structure 12. The second hinge seat 20 includes a second hinge portion 21, the second hinge portion 21 is rotatably connected to the first hinge portion 11, and the second hinge portion 21 is provided with a second accommodation cavity 22 and a second opening 23. A piston 30 is disposed in the second accommodation cavity 22, the piston 30 has a second mating structure 31, and the second mating structure 31 abuts against the first mating structure 12 through the second opening 23. The connecting shaft 40 passes through the first hinge portion 11, the piston 30, and the second hinge portion 21 to axially fix the first hinge portion 11 and the second hinge portion 21 relative to each other. A first limiting structure 50 is disposed between the abutting surfaces of the first mating structure 12 and the second mating structure 31. The first limiting structure 50 includes a first limiting portion 51 located on the first mating structure 12 and a second limiting portion 52 located on the second mating structure 31. When the hinge mechanism is in the initial state, the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation.

[0042] Exemplarily, the first hinge seat 10 can be a rotating seat, and the second hinge seat 20 can be a fixed seat. The hinge mechanism can be installed between the door body and the box body of the opening and closing device, so that the door body can be opened and closed relatively. The first hinge seat 10 can be connected to the side wall of the door body, and the second hinge seat 20 can be connected to the side wall of the box body. When the door body and the box body are closed, the first hinge portion and the second hinge portion can be regarded as being in the same plane.

[0043] Exemplarily, when the hinge mechanism is in the initial state, the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation to position the hinge mechanism to the initial state, so that the initial state of the hinge mechanism will not change due to transportation or other external forces. For example, when the included angle between the first hinge seat and the second hinge seat is less than 180°, the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation. For example, when the included angle between the first hinge seat and the second hinge seat is 175°, the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation. When the hinge mechanism is actually assembled on the box body of the opening and closing device, the included angle range between the first hinge seat and the second hinge seat is greater than 180° during normal use of the door body. During normal use, the first limiting portion 51 and the second limiting portion 52 are in a misaligned state, so that the first limiting portion 51 and the second limiting portion 52 hardly play a role, thereby avoiding affecting the normal use of the hinge mechanism.

[0044] For the hinge mechanism of the related art, the initial state of the hinge mechanism is positioned by the protrusions and grooves provided on the outer walls of the first hinge seat and the second hinge seat. For example, a groove is provided on the outer wall of the first hinge seat near the second hinge seat, and a protrusion adapted to the groove is provided on the second hinge seat. When the hinge mechanism is in the initial angle, the protrusion is adapted to be located in the groove. When the hinge mechanism is in use, that is, when the hinge mechanism is opened, the protrusion is subjected to a corresponding force and falls off or breaks and peels off from the second hinge seat. The peeling off of the protrusion may peel off some materials on the second hinge seat, which may affect the structural strength of the second hinge seat and also affect the overall appearance neatness and beauty of the hinge mechanism. The peeling off of the protrusion also requires further cleaning of the peeled-off structure, increasing the installation workload. However, the hinge mechanism of the embodiment of the present disclosure realizes the positioning of the initial state of the hinge mechanism by providing a first limiting structure 50 between the abutting surfaces of the first mating structure 12 and the second mating structure 31, thus avoiding the reduction of the structural strength of the second hinge seat caused by the peeling off of the protrusion, and the first limiting structure is hidden between the abutting surfaces of the first mating structure 12 and the second mating structure 31, avoiding affecting the overall appearance neatness and beauty of the hinge mechanism.

[0045] The hinge mechanism of the embodiments of the present disclosure includes a first hinge seat 10, a second hinge seat 20, and a connecting shaft 40. The first hinge seat 10 includes a first hinge portion 11, and the first hinge portion 11 is provided with a first mating structure 12. The second hinge seat 20 includes a second hinge portion 21, the second hinge portion 21 is rotatably connected to the first hinge portion 11, the second hinge portion 21 is provided with a second accommodation cavity 22 and a second opening 23. A piston 30 is disposed in the second accommodation cavity 22, the piston 30 has a second mating structure 31, and the second mating structure 31 abuts against the first mating structure 12 through the second opening 23. The connecting shaft 40 passes through the first hinge portion 11, the piston 30, and the second hinge portion 21 to axially fix the first hinge portion 11 and the second hinge portion 21 relatively. A first limiting structure 50 is disposed between the abutting surfaces of the first mating structure 12 and the second mating structure 31. The first limiting structure 50 includes a first limiting portion 51 located on the first mating structure 12 and a second limiting portion 52 located on the second mating structure 31. When the hinge mechanism is in the initial state, the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation. With such a setting, the first limiting portion 51 and the second limiting portion 52 are located between the abutting surfaces of the first mating structure 12 and the second mating structure 31, and the first limiting portion 51 and the second limiting portion 52 are in limiting cooperation to realize the positioning of the initial state of the hinge mechanism, thereby avoiding the change of the initial state of the hinge mechanism due to transportation or other external forces. The embodiments of the present disclosure can avoid the reduction of the structural strength of the first hinge seat or the second hinge seat caused by the shedding of the protrusion, and the first limiting structure is hidden between the abutting surfaces of the first mating structure and the second mating structure, avoiding affecting the overall appearance neatness and beauty of the hinge mechanism, and eliminating the need to clean the shed protrusion structure, reducing the installation workload.

[0046] Figure 6 Schematic diagram of the perspective of the first hinge seat of the embodiments of the present disclosure; Figure 7 Schematic diagram of the other perspective of the first hinge seat of the embodiments of the present disclosure. Refer to Figures 1 to 7 As shown, in an embodiment of the disclosure, the second mating structure 31 includes a first helical surface 311 and a first top surface 312, the first mating structure 12 includes a first mating surface 121 and a second top surface 122, one end of the first top surface 312 is connected to the top end of the first helical surface 311, the first helical surface 311 cooperates with the first mating surface 121, the first top surface 312 corresponds to the second top surface 122, the first limiting portion 51 is disposed on the second top surface 122, the second limiting portion 52 is disposed on the first top surface 312, and when the hinge mechanism is in the open state, the first helical surface 311 abuts against the first mating surface 121.

[0047] In the hinge mechanism of the embodiments of the present disclosure, the first helical surface 311 is used to support the door body to reach a balanced state when opening the door, so that the door body can achieve a hovering effect. A second limiting portion 52 is provided on the first top surface 312, and a first limiting portion 51 is provided on the second top surface 122. The first top surface 312 and the second top surface 122 cooperate to limit the relative positions of the first hinge seat 10 and the second hinge seat 20 before the hinge mechanism is installed and used, preventing the hinge mechanism from accidentally popping open during storage and transportation.

[0048] Referring to Figures 1 to 6 As shown, in an embodiment of the present disclosure, the first limiting portion 51 is a convex portion, and the second limiting portion 52 is a concave portion adapted to the convex portion. Alternatively, the first limiting portion 51 is a concave portion, and the second limiting portion 52 is a convex portion adapted to the concave portion. It should be noted that the specific shapes and sizes of the convex portion and the concave portion are not limited herein, as long as they can meet the limiting cooperation of the initial state of the hinge mechanism.

[0049] Exemplarily, the cross-sectional shape of the concave portion is generally circular, and the cross-sectional shape of the convex portion is generally circular. The diameter of the concave portion is greater than or equal to the diameter of the convex portion. With such a setting, the convex portion can be more conveniently inserted into the concave portion, the assembly of the piston is easier, the fault tolerance is higher, and the effect is better.

[0050] Figure 8 Schematic view of the second hinge seat perspective of the embodiments of the present disclosure; Figure 9 Internal schematic view of the second hinge seat of the embodiments of the present disclosure. Referring to Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, in an embodiment of the present disclosure, the side wall of the piston 30 is provided with an axially extending guide groove 32, and the side wall of the second accommodation cavity 22 is provided with a corresponding guide protrusion 221, and the guide protrusion 221 is disposed in the guide groove 32.

[0051] In an embodiment of the present disclosure, the hinge mechanism further includes a fastener, and the fastener is connected to both ends of the connecting shaft 40 to axially fix the first hinge seat 10 and the second hinge seat 20 relative to each other.

[0052] Figure 10 Schematic view of the gasket of the embodiments of the present disclosure. Referring to Figure 1 、 Figure 2 and Figure 10 As shown, in an embodiment of the present disclosure, the hinge mechanism further includes a gasket 60, the center of the gasket 60 has a non-circular hole, and the end of the connecting shaft 40 penetrates into the non-circular hole and is riveted to the gasket 60.

[0053] As Figure 10As shown, exemplarily, the center of the gasket 60 has a polygonal hole, and the end of the connecting shaft 40 penetrates into the polygonal hole and is riveted to the gasket 60. Exemplarily, the polygonal hole at the center of the gasket 60 can be a regular hexagon. With such a setting, when the connecting shaft 40 and the gasket 60 are riveted, the relative fixation of the gasket 60 and the connecting shaft 40 can be ensured, playing a limiting role. Since continuous friction occurs during the relative rotation of the connecting shaft 40 and the gasket 60, it may cause wear and fracture at the riveting part, thereby affecting the strength of the hinge mechanism. However, setting the non-circular hole as a polygonal hole in the embodiments of the present disclosure can avoid damage.

[0054] Referring to Figure 4 As shown, in an exemplary embodiment, the piston 30 is provided with weight-reducing holes 34. Exemplarily, the piston 30 is provided with a plurality of weight-reducing holes 34, and the plurality of weight-reducing holes 34 are circumferentially spaced based on the central axis of the piston 30. With such a setting, the weight of the piston 30 and the hinge mechanism can be reduced, and injection molding defects generated during the solid injection molding of the piston 30 can be avoided.

[0055] Referring to Figure 1 and Figure 2 As shown, in an exemplary embodiment, the hinge mechanism further includes an elastic member 70. The elastic member 70 is disposed in the second accommodation cavity 22 and at one end of the piston 30 facing away from the second mating structure 31. The elastic member 70 can provide assistance for the abutting state.

[0056] Exemplarily, the elastic member 70 can be a spring. In the embodiments of the present disclosure, the elastic member 70 can provide assistance for the abutting state. During the process of closing the door body of the opening and closing device, the problem of violent collision between the door body and the box body caused by the rapid descent of the door body of the opening and closing device can be alleviated, thereby improving the user experience. Moreover, both the piston 30 and the elastic member 70 are disposed in the second accommodation cavity 22 of the second hinge seat 20, and the first hinge seat 10, the second hinge seat 20, the piston 30, and the elastic member 70 can be assembled and connected through the connecting shaft 40. The hinge mechanism has a simple structure, is convenient to assemble, and reduces the space occupied by the hinge mechanism.

[0057] Referring to Figure 4 and Figure 5 As shown, in an exemplary embodiment, a first positioning protrusion 33 is provided along the center at the bottom end of the piston 30. The first positioning protrusion 33 is used to position the elastic member 70. Exemplarily, the first positioning protrusion 33 is adapted to the hole at the first end of the elastic member 70. Thus, by installing the elastic member 70 with the first positioning protrusion 33, the positioning of the first end of the elastic member 70 can be achieved, preventing the elastic member 70 from shaking and reducing the wear of the elastic member 70.

[0058] Referring to Figure 1 , Figure 8 and Figure 9As shown, in an exemplary embodiment, a second positioning protrusion 222 is provided along the center at the bottom end of the second receiving cavity 22. The second positioning protrusion 222 is used to position the elastic member 70. Exemplarily, the second positioning protrusion 222 is adapted to the hole at the second end of the elastic member 70. By installing the elastic member 70 with the second positioning protrusion 222, the positioning of the second end of the elastic member 70 is achieved, which can prevent the elastic member 70 from shaking and reduce the wear of the elastic member 70. Moreover, when a counterbore is provided at the bottom end of the second hinge seat 20 corresponding to the fastener at the end of the connecting shaft 40, the second positioning protrusion 222 can also improve the structural strength of the second hinge seat 20.

[0059] It should be noted that the first positioning protrusion 33 and the second positioning protrusion 222 can be provided simultaneously. The first positioning protrusion 33 and the second positioning protrusion 222 can respectively position both ends of the elastic member 70, which can further prevent the elastic member 70 from shaking and reduce the wear of the elastic member 70.

[0060] Refer to Figure 1 and Figure 2 As shown, in an exemplary embodiment, the first hinge seat 10 further includes a first mounting portion 13, and the first mounting portion 13 is used to connect with the door body of the opening and closing device. The second hinge seat 20 further includes a second mounting portion 24, and the second mounting portion 24 is used to connect with the box body of the opening and closing device. A first mounting hole 131 is provided on the first mounting portion 13, and a second mounting hole 241 is provided on the second mounting portion 24. The first mounting portion 13 can be connected with the door body of the opening and closing device by screwing a screw or a bolt through the first mounting hole 131, and the second mounting portion 24 can be connected with the box body of the opening and closing device by screwing a screw or a bolt through the second mounting hole 241.

[0061] Refer to Figure 7 and Figure 8 As shown, exemplarily, a first reinforcing rib 132 is provided on the first mounting portion 13, and a second reinforcing rib 242 is provided on the second mounting portion 24. With such a setting, the first reinforcing rib 132 can enhance the structural strength of the first mounting portion 13, and the second reinforcing rib 242 can enhance the structural strength of the second mounting portion 24, improving the overall structural strength and reliability of the hinge mechanism.

[0062] Refer to Figure 7 and Figure 8 As shown, exemplarily, the first hinge portion 11 and the first mounting portion 13 are integrally formed, and the second hinge portion 21 and the second mounting portion 24 are integrally formed. For example, the first hinge portion 11 and the first mounting portion 13 can be integrally formed by injection molding, and the second hinge portion 221 and the second mounting portion 22 can be integrally formed by injection molding.

[0063] Refer to Figure 1 and Figure 2As shown, in an exemplary embodiment, the first hinge seat 10 further includes a first mounting portion 13, and the first mounting portion 13 is used to connect to the door body of the opening and closing device. The second hinge seat 20 further includes a second mounting portion 24, and the second mounting portion 24 is used to connect to the box body of the opening and closing device. A strengthening hole 243 is further provided on the second hinge portion 24, and the strengthening hole 243 is docked with a strengthening protrusion on the box body of the opening and closing device. When the second mounting portion 24 is connected to the box body, the strengthening protrusion is inserted into the strengthening hole 243. Through the cooperation of the strengthening hole 243 and the strengthening protrusion, the connection strength between the second hinge seat 20 and the box body can be further enhanced. Moreover, when the opening and closing device opens the door, the strengthening protrusion of the box body can play a limiting role on the second hinge seat through the strengthening hole 243, so that the hinge mechanism will no longer tilt backward after being stressed, thereby achieving the anti-backward-tilting effect, further improving the stability and reliability of the hinge mechanism, and preventing loosening.

[0064] Exemplarily, the strengthening hole 243 is arranged along the extending direction of the second hinge portion 24, and the second hinge portion 24 can be assembled with the box body of the opening and closing device in a flat insertion manner. With such a setting, when installing the hinge mechanism, there is no need to lift the door body, and the second hinge seat 20 can be directly inserted. Moreover, compared with the downward insertion hinge in the related art, which has a risk of tilting backward and disengaging during the strength test, the hinge mechanism of the present exemplary embodiment has better strength and can be limited in both the backward and upward directions, reducing the risk of tilting backward and disengaging.

[0065] Exemplarily, a first strengthening rib 132 is provided on the first mounting portion 13, and a second strengthening rib 242 is provided on the second mounting portion 24. With such a setting, the first strengthening rib 132 can enhance the structural strength of the first mounting portion 13, and the second strengthening rib 242 can enhance the structural strength of the second mounting portion 24. The first hinge portion 11 and the first mounting portion 13 are integrally formed, and the second hinge portion 21 and the second mounting portion 24 are integrally formed. For example, the first hinge portion 11 and the first mounting portion 13 can be integrally formed by injection molding, and the second hinge portion 221 and the second mounting portion 22 can be integrally formed by injection molding.

[0066] Refer to Figure 2 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9As shown, in an exemplary embodiment, the hinge mechanism further includes a second limiting structure 80. The second limiting structure 80 includes a limiting protrusion 81 and a limiting groove 82. The limiting protrusion 81 is disposed on a side of the first mounting portion 13 close to the second hinge portion 21, and the limiting groove 82 is disposed on a surface of the second mounting portion 24 facing away from the cabinet of the opening and closing device. When the door of the opening and closing device is at the maximum opening and closing angle, at least a part of the limiting protrusion 81 is clamped and pressed into the limiting groove 82. When the opening and closing device is at the maximum opening and closing angle, a part of the limiting protrusion 81 is clamped and pressed into the limiting groove 82, and an interference fit is formed between the limiting protrusion 81 and the limiting groove 82, which can prevent the generation of frictional noise caused by the shaking due to the elasticity of the hinge. Moreover, it can also limit the door body when the opening and closing device is at the maximum opening and closing angle, preventing the door body from closing accidentally.

[0067] The limiting protrusion 81 is a block structure rather than a strip structure, which can ensure that the hinge mechanism cannot fail within a certain door-opening force range, while the hinge mechanism can fail but cannot break within a range exceeding a certain door-opening force. For example, when the design requirement is that the door is pushed with a force of 0 - 80N, the hinge mechanism cannot fail, so the limiting protrusion 81 and the limiting groove 82 are provided to achieve the limitation. When the design requirement is that the door is pushed with a force exceeding 80N, the hinge can fail, but it cannot be damaged or broken, and the limiting protrusion is broken according to a force of about 80N. In this way, when the door is pushed with a greater force, it will not cause the hinge to break, but only cause the hinge mechanism to rotate excessively and fail.

[0068] The exemplary embodiment of the present disclosure further provides an opening and closing device, which includes a cabinet and a door. The cabinet has a cabinet opening, and the door is hinged to the cabinet opening of the cabinet through the hinge mechanism described in any one of the embodiments of the present disclosure.

[0069] Exemplarily, the opening and closing device can be a freezer. For example, the opening and closing device can be a horizontal freezer with an upward-opening door, or the opening and closing device can also be other devices that can be opened and closed, such as a dishwasher or a storage locker, etc.

[0070] The above detailed description is a specific description of the feasible embodiments of the present invention, and this embodiment is not intended to limit the protection scope of the present invention. Any equivalent implementation or modification made without departing from the present invention shall be included in the protection scope of the present invention.

Claims

1. A hinge mechanism, characterized in that: include A first hinge seat, comprising a first hinge portion, wherein the first hinge portion is provided with a first matching structure; A second hinge seat, comprising a second hinge part, the second hinge part is rotatably connected to the first hinge part, the second hinge part is provided with a second accommodating cavity and a second opening, a piston is provided in the second accommodating cavity, the piston has a second matching structure, and the second matching structure abuts against the first matching structure through the second opening; A connecting shaft is passed through the first hinged part, the piston and the second hinged part so that the first hinged part and the second hinged part are relatively fixed in the axial direction. A first limiting structure is arranged between the abutting surfaces of the first matching structure and the second matching structure. The first limiting structure includes a first limiting part located on the first matching structure and a second limiting part located on the second matching structure. When the hinge mechanism is in an initial state, the first limiting part and the second limiting part are limitedly matched.

2. The hinge mechanism according to claim 1, characterized in that: The second mating structure includes a first helical surface and a first top surface, the first mating structure includes a first mating surface and a second top surface, one end of the first top surface is connected to the top end of the first helical surface, the first helical surface and the first mating surface are matched, the first top surface and the second top surface correspond to each other, the first limiting portion is arranged on the second top surface, the second limiting portion is arranged on the first top surface, and when the hinge mechanism is in an open state, the first helical surface and the first mating surface are abutted.

3. The hinge mechanism according to claim 1 or 2, characterized in that: The first limiting portion is a raised portion, and the second limiting portion is a recessed portion matched with the raised portion; or the first limiting portion is a recessed portion, and the second limiting portion is a raised portion matched with the recessed portion.

4. The hinge mechanism according to claim 3, characterized in that: The diameter of the recessed portion is greater than or equal to the diameter of the raised portion.

5. The hinge mechanism according to claim 1, characterized in that: The side wall of the piston is provided with an axially extending guide groove, and the side wall of the second accommodating chamber is provided with a corresponding guide protrusion, and the guide protrusion is arranged in the guide groove; and / or, The hinge mechanism further includes a fastener connected to both ends of the connecting shaft so as to relatively fix the first hinge seat and the second hinge seat in the axial direction; and / or, The hinge mechanism further comprises a gasket, wherein the center of the gasket has a non-circular hole, and the end of the connecting shaft penetrates into the non-circular hole and is riveted to the gasket; or, the center of the gasket has a polygonal hole, and the end of the connecting shaft penetrates into the polygonal hole and is riveted to the gasket; and / or, The piston is provided with a weight-reducing hole.

6. The hinge mechanism according to claim 1, characterized in that: The hinge mechanism further comprises an elastic member, which is disposed in the second accommodating cavity and located at an end of the piston away from the second matching structure, and the elastic member can provide assistance for the abutting state; A first positioning protrusion is provided along the center of the bottom end of the piston, and the first positioning protrusion is used to position the elastic member; and / or, A second positioning protrusion is provided along the center of the bottom end of the second accommodating cavity, and the second positioning protrusion is used to position the elastic member.

7. The hinge mechanism according to claim 1, characterized in that: The first hinge seat further includes a first mounting portion, the first mounting portion is used to connect to the door body of the opening and closing device, the second hinge seat further includes a second mounting portion, the second mounting portion is used to connect to the box body of the opening and closing device, the first mounting portion is provided with a first mounting hole, and the second mounting portion is provided with a second mounting hole; and / or, The first mounting portion is provided with a first reinforcing rib, and the second mounting portion is provided with a second reinforcing rib; and / or, The first hinged portion and the first mounting portion are integrally formed, and the second hinged portion and the second mounting portion are integrally formed.

8. The hinge mechanism according to claim 1, characterized in that: The first hinge seat further includes a first mounting portion, the first mounting portion is used to connect with the door body of the opening and closing device, the second hinge seat further includes a second mounting portion, the second mounting portion is used to connect with the box body of the opening and closing device, and the second hinge portion is further provided with a reinforcement hole, the reinforcement hole is docked with the reinforcement protrusion on the box body of the opening and closing device; and / or, The first mounting portion is provided with a first reinforcing rib, and the second mounting portion is provided with a second reinforcing rib; and / or, The first hinged portion and the first mounting portion are integrally formed, and the second hinged portion and the second mounting portion are integrally formed.

9. The hinge mechanism according to claim 7 or 8, characterized in that: The hinge mechanism also includes a second limiting structure, which includes a limiting protrusion and a limiting groove. The limiting protrusion is arranged on a side of the first mounting part close to the second hinged part, and the limiting groove is arranged on a surface of the second mounting part facing away from the box body of the closing and opening device. When the door body of the opening and closing device is at the maximum opening and closing angle, the limiting protrusion is at least partially clamped and pressed into the limiting groove.

10. An opening and closing device, characterized in that: include: A box body having a box opening; A door body, wherein the door body is hinged at the box opening of the box body through the hinge mechanism described in any one of claims 1 to 9.

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