Hinge device and opening and closing device

Abstract

The utility model discloses hinge equipment and an opening and closing device, the hinge equipment comprises a first hinge seat and a second hinge seat, the second hinge seat comprises a second hinge part and a second mounting part, the second hinge part is rotatably connected with the first hinge part, the second mounting part is used for being mounted and embedded in a mounting cavity of an opening and closing device main body, and the mounting cavity comprises a front side wall; an elastic sheet structure and an accommodating groove are arranged on the front surface, close to the front side wall, of the second mounting part along the height direction of the second mounting part; the containing groove penetrates through the front face of the second installation part, the elastic piece structure comprises a fixed end and a free end, the fixed end is connected with the top end of the containing groove, at least part of the free end protrudes out of the front face of the second installation part, and after the free end of the elastic piece structure is pressed, the free end can elastically retract to be close to the containing groove. The hinge equipment can be prevented from loosening after being used for a long time, and the installation reliability is improved through the elastic piece structure arranged on the front face, close to the front side wall, of the second installation part.

Description

Technical Field

[0001] This disclosure relates to the field of hinge devices, and more particularly to a hinge device and an opening / closing mechanism. Background Technology

[0002] A hinge is a device installed on a door to open and close it. For example, a hinge installed in a freezer includes a fixed base connected to the freezer body, a rotating base connected to the door body, and a spindle passing through the fixed base and the rotating base. Some hinges also include a spring element.

[0003] In related technologies, due to the pushing force of opening the door, the elastic force of the elastic element, and inertia, a very large torque is generated. This can cause the rotating seat to be subjected to a large force when rotating. Since the rotating seat and the fixed seat are fixed together by a spindle, the force on the rotating seat will cause the fixed seat to tilt backward. In related technologies, the fixed seat is connected to the cabinet by screws, which cannot completely prevent the hinge from tilting backward, resulting in reduced reliability of the hinge device. After long-term use, the hinge device is prone to loosening. Utility Model Content

[0004] As a first aspect of the present disclosure, an embodiment of the present disclosure provides a hinge device.

[0005] The first hinge seat includes a first hinge portion;

[0006] The second hinge seat includes a second hinge part and a second mounting part. The second hinge part is rotatably connected to the first hinge part. The second mounting part is used to install and embed in the mounting cavity of the opening and closing device body. The mounting cavity includes a front side wall. The front of the second mounting part near the front side wall is provided with a spring structure and a receiving groove.

[0007] The spring structure and the receiving groove are arranged along the height direction of the second mounting part. The receiving groove is arranged through the front of the second mounting part. The spring structure includes a fixed end and a free end. The fixed end is connected to the top of the receiving groove. The free end protrudes at least partially from the front of the second mounting part. After the free end of the spring structure is pressed, the free end can elastically retract close to the receiving groove.

[0008] As a second aspect of the present disclosure, an opening and closing device is provided, the opening and closing device including...

[0009] The device body has a third opening, and the outer wall of the device body has a mounting cavity recessed into the device body. The mounting cavity has a fourth opening facing the outside of the device body.

[0010] The door body is closably connected to the third opening of the device body via a hinge device as described in any of the embodiments of the present disclosure. The first hinge seat is connected to the side wall of the door body, and the second hinge portion is at least partially located within the mounting cavity. The second mounting portion is installed and embedded in the mounting cavity.

[0011] The technical solution of this disclosure embodiment can achieve the following beneficial effects: In this hinge device, the second hinge seat is connected to the main body of the opening and closing device through the second mounting part. The second mounting part is used to install and embed in the mounting cavity of the main body of the opening and closing device. When the opening and closing device opens the door, the mounting cavity can limit the second hinge seat through the second mounting part, so that the hinge device will not tilt backward after being subjected to force, thereby achieving the anti-tilting effect, improving the stability and reliability of the hinge device, and preventing the hinge device from loosening after long-term use. The spring sheet structure set at the front can improve the reliability of the insertion. Attached Figure Description

[0012] Figure 1a This is a schematic diagram of the main assembly of the chain device and opening / closing device according to an embodiment of the present disclosure;

[0013] Figure 1b This is an exploded view of the main body of the hinge device and opening / closing mechanism according to an embodiment of this disclosure;

[0014] Figure 1c This is a side view of the second hinge seat according to an embodiment of the present disclosure;

[0015] Figure 1d This is a schematic diagram of the rear view of the second hinge seat according to an embodiment of the present disclosure;

[0016] Figure 1e This is a side view of the second hinge seat according to an embodiment of the present disclosure;

[0017] Figure 1f This is a schematic diagram of the main body of the device according to an embodiment of the present disclosure;

[0018] Figure 2a This is a schematic diagram of the rear view of the first hinge seat according to an embodiment of the present disclosure;

[0019] Figure 2b This is a side view of the first hinge seat according to an embodiment of the present disclosure;

[0020] Figure 3a This is a schematic diagram of a piston according to an embodiment of the present disclosure;

[0021] Figure 3b This is a schematic diagram of a piston according to an embodiment of the present disclosure;

[0022] Figure 4a This is a schematic diagram of the main body of the device according to an embodiment of the present disclosure;

[0023] Figure 4bThis is a schematic diagram of the main body of the device according to an embodiment of the present disclosure;

[0024] Figure 4c This is a side view of the second hinge seat according to an embodiment of the present disclosure;

[0025] Figure 4d This is a second schematic diagram of the side view of the second hinge seat according to an embodiment of this disclosure;

[0026] Figure 5a This is a schematic diagram of the main body of the device according to an embodiment of the present disclosure;

[0027] Figure 5b This is a schematic diagram from another side of the main body of the device according to an embodiment of this disclosure;

[0028] Figure 5c This is a side view of the second hinge seat according to an embodiment of the present disclosure;

[0029] Figure 5d This is a schematic diagram of the other side of the second hinge seat in an embodiment of this disclosure. Detailed Implementation

[0030] The contents of this disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1a-1f As shown, this embodiment of the present disclosure provides a hinge device 100. The hinge device 100 includes a first hinge seat 10 and a second hinge seat 20. The first hinge seat 10 includes a first hinge portion 11. The second hinge seat 20 includes a second hinge portion 21 and a second mounting portion 22, the second hinge portion 21 being rotatably connected to the first hinge portion 11. The second mounting portion 22 is used to mount and embed in the mounting cavity 201 of the opening and closing device body 200. The mounting cavity 201 includes a front sidewall 2011 and inner sidewalls 2012 located on both sides of the front sidewall 2011. The second mounting portion 22 is provided with a spring sheet structure 90 and a receiving groove S near the front sidewall 2011.

[0032] like Figures 1c-1d As shown, the spring-loaded structure 90 and the receiving groove S extend along the height direction of the second mounting portion 22, with the receiving groove S penetrating the front of the second mounting portion 22. The spring-loaded structure 90 includes a free end 91 and a fixed end 92, with the free end 91 positioned away from the second hinge portion 21 relative to the fixed end 92. The fixed end 92 is connected to the top of the receiving groove S. The free end 91 at least partially protrudes from the front of the second mounting portion 22, and after the free end 91 of the spring-loaded structure 90 is compressed, the free end 91 can elastically retract towards the receiving groove.

[0033] For example, in its initial state, the second mounting portion 22 of the spring structure 90 is not under any pressure, the free end of the spring structure 90 is not compressed, and the free end 91 at least partially protrudes from the front of the second mounting portion 22. When the second mounting portion 22 is inserted into the mounting cavity 201, due to the compression of the free end of the spring structure 90, the free end of the spring structure 90 retracts into the receiving groove along the direction close to the receiving groove S. When the second mounting portion 22 is installed in place, the spring structure 90 loses pressure and resets to its initial state, thereby allowing the free end 91 to engage with the first engaging groove of the mounting cavity, thus fixing the second mounting portion 22. This configuration further improves the stability and reliability of the second mounting portion fixing.

[0034] like Figure 1c As shown, exemplarily, the front of the second mounting part 22 is provided with a number of receiving grooves S equal to the number of spring sheet structures 90. The shape of the receiving grooves S can approximately match the shape of the spring sheet structure 90. For example, the spring sheet structure 90 is a square sheet, and the receiving grooves S are square grooves. The specific shape of the receiving grooves S is not limited; the receiving grooves S can also be set to a circle or other irregular shapes. The specific size of the receiving grooves S is not limited here and can be set according to the size of the spring sheet structure 90.

[0035] The spring-loaded structure 90 and the receiving groove S extend along the height direction of the second mounting portion 22. The top of the receiving groove S is the side of the receiving groove closest to the second hinge portion 21. The fixed end 92 of the spring-loaded structure 90 is connected to the top of the receiving groove S and extends along the height of the receiving groove S. In the initial state, the free end 91 protrudes at least partially from the front. When the second mounting portion 22 is inserted into the mounting cavity 201, the free end 91 of the spring-loaded structure 90 is compressed, causing elastic deformation, thereby compressing and retracting into the receiving groove S. When the pressure on the free end 91 of the spring-loaded structure 90 disappears, the free end 91 of the spring-loaded structure 90 returns to its initial state, thereby securing the spring-loaded structure 90 and further improving the stability and reliability of the installation.

[0036] The front sidewall 2011 of the main body 200 of the opening and closing device is provided with two first snap-fit ​​grooves 203. There are also two spring clip structures 90. Two vertically oriented receiving grooves S are provided on the front of the second mounting part 22. The spring clip structure 90 extends along the length of the receiving groove S. The fixed end 92 of the spring clip structure 90 connects to the top of the receiving groove S, and the free end 91 of the spring clip structure 90 protrudes from the receiving groove S. The free end 91 is wedge-shaped, with the wedge-shaped surface facing outwards. The free end 91 protrudes relative to the fixed end 92, forming a step between them. The free end 91 engages with the first snap-fit ​​grooves 203 for secure fixing, thus ensuring the stability and reliability of the second mounting part 22.

[0037] For example, the second mounting part 22 is installed and embedded in the mounting cavity, and the free end 91 of the spring structure 90 can be snapped into the first snap-fit ​​groove 203, thereby fixing the second mounting part 22. When the second mounting part 22 is inserted along the mounting cavity 201, the free end 91 of the spring structure 90 is subjected to pressure from the front side wall of the mounting cavity 201, causing it to elastically contract into the receiving groove S. When the second mounting part 22 is inserted into place, that is, when the spring structure 90 is in the first snap-fit ​​groove 203, the free end 91 of the spring structure 90 recovers its elastic deformation and snaps into the first snap-fit ​​groove 203, thereby fixing the second mounting part 22 and the mounting cavity 201.

[0038] For example, in the embodiment of this disclosure, the free end 91 of the spring structure 90 is disposed away from the second hinge portion 21 relative to the fixed end 92, that is, the free end 91 is located below the fixed end 92.

[0039] For example, the first hinge seat 10 is a rotating seat, and the second hinge seat 20 is a fixed seat. The hinge device can be connected between the door of an opening and closing device (e.g., a freezer) and the opening and closing device body, so that the door and the opening and closing device body are hinged.

[0040] For example, the first hinge seat 10 can be connected to the side wall of the door of the opening and closing device and rotate with the door. The second hinge seat 20 is connected to the main body 200 of the opening and closing device through the second mounting part 22. When the door and the main body 200 of the opening and closing device are closed, the first hinge part 11 and the second hinge part 21 can be regarded as being on the same plane.

[0041] For example, the hinge device has a first posture and a second posture. The first hinge seat 10 can reciprocate relative to the second hinge seat 20 within a preset angle range, causing the first mating structure and the second mating structure to slide relative to each other, so that the hinge device can switch between the first posture and the second posture. During assembly, the first posture of the hinge device can correspond to the closed state of the door of the opening and closing device and the state with a small door opening angle, and the second posture can correspond to the maximum open state of the door of the opening and closing device and the state with a large door opening angle.

[0042] For example, the second mounting portion 22 is used to be installed and embedded in the mounting cavity 201 of the opening and closing device body 200. The opening and closing device body 200 has a mounting cavity 201, which may include a first cavity and a second cavity arranged in a left-right direction. The depth of the first cavity is greater than the depth of the second cavity. The first hinge seat 10 is installed through the second cavity, and the second hinge seat 20 is installed through the first cavity. For example, the second mounting portion 22 of the second hinge seat 20 is completely installed and embedded in the second cavity of the opening and closing device body 200, and the second hinge portion 21 is at least partially located in the second cavity. The first hinge portion 11 is installed through the first cavity and is at least partially located outside the first cavity.

[0043] Reference Figures 1a-1b As shown, by way of example, the second mounting part 22 is embedded in the mounting cavity 201 of the opening and closing device body 200. The second mounting part 22 may be spaced a certain distance from the inner sidewall of the mounting cavity 201 or the second mounting part 22 may be in contact with the inner sidewall of the mounting cavity 201.

[0044] For example, in the front-rear direction of the opening and closing device body 200, the second mounting portion 22 can be constrained by the inner wall of the mounting cavity 201. In the vertical direction of the opening and closing device body, the second mounting portion 22 can be constrained by the bottom of the mounting cavity 201. This prevents the hinge from tilting backward under force, thus achieving an anti-tilting effect, improving the reliability of the hinge, and preventing the hinge from loosening after long-term use.

[0045] In this embodiment of the hinge device, a spring-loaded structure 90 is provided on the front of the second mounting portion 22, which can engage with the first engaging groove 203 of the mounting cavity 201. The free end 91 of the spring-loaded structure 90 is positioned away from the fixed end 92 of the second hinge portion 21, and the spring-loaded structure 90 can be integrally engaged in the first engaging groove 203. This allows the second mounting portion 22 to be engaged and fixed within the mounting cavity 201 of the opening and closing device body 200, improving the reliability of the second mounting portion 22's fixation. The mounting cavity 201 also serves as a limit for the second mounting portion 22, preventing the hinge device from tilting backward under force, achieving an anti-tilting effect, improving the stability and reliability of the hinge device, and preventing the hinge device from loosening after long-term use.

[0046] In one disclosed embodiment, the spring-loaded structure 90 and the second mounting portion 22 are integrally formed. The material of the spring-loaded structure 90 can be selected according to actual usage requirements.

[0047] For example, the spring structure 90 can also be installed in a detachable manner, and the spring structure 90 and the top of the receiving groove S can be detachably connected and fixed.

[0048] In one disclosed embodiment, the bottom end of the receiving groove S extends through the bottom of the second mounting portion 22. That is, the front end of the receiving groove S extends through the front end of the second mounting portion 22, and the bottom surface of the receiving groove S extends through the bottom of the second mounting portion 22.

[0049] Reference Figure 1c As shown, exemplarily, the spring structure 90 includes a flat plate portion 901 and a wedge-shaped portion 902. One end of the flat plate portion 901 is connected to the top of the receiving groove S to form a fixed end 92. The flat plate portion 901 is generally square in shape to match the receiving groove S. The flat plate portion 901 can be entirely accommodated in the receiving groove S, and the back surfaces of the flat plate portion 901 and the receiving groove S are spaced apart by a certain distance. The flat plate portion 901 can be slightly smaller than the size of the receiving groove S. The side of the flat plate portion 901 away from the fixed end 92 is connected to the wedge-shaped portion 902. The wedge-shaped portion 902 is generally formed as a free end 91.

[0050] For example, the plate portion 901 is located in the receiving groove S, and there are gaps between the left and right sides of the plate portion 901 and the sides of the receiving groove S. There is also a gap between the back of the plate portion 901 and the back of the receiving groove S. This allows the spring sheet structure 90 to elastically retract a certain distance in the receiving groove S.

[0051] Reference Figure 1cAs shown, exemplarily, the connection position between the wedge-shaped portion 902 and the flat plate portion 901 forms a step shape, that is, the thickness between the wedge-shaped portion 902 and the flat plate portion 901 is inconsistent, so that the outer side of the wedge-shaped portion 902 protrudes from the flat plate portion 901, i.e., the wedge-shaped portion 902 protrudes from the front relative to the flat plate portion 901. The wedge-shaped portion 902 includes a planar positioning surface. The positioning surface can mate with the inner wall of the mounting cavity 201 during installation, facilitating the insertion of the second mounting portion 22. An inclined surface is formed between the positioning surface and the bottom surface of the wedge-shaped portion 902.

[0052] Reference Figures 1c to 1e As shown, in one disclosed embodiment, the thickness of the second mounting portion 22 is less than the diameter of the second hinge portion 21, and the step difference between the back surface of the second mounting portion 22 and the back surface of the second hinge portion 21 is less than or equal to a preset value. The thickness of the second mounting portion 22 can be understood as the dimension of the second mounting portion 22 in the direction perpendicular to the axis of the second hinge portion 21 (front-back direction in the figure).

[0053] It should be noted that the step difference between the back surface of the second mounting portion 22 and the back surface of the second hinge portion 21 is less than or equal to a preset value. This can be understood as the back surface of the second mounting portion 22 and the back surface of the second hinge portion 21 being approximately flush. For example, the step difference can be 0, meaning that the back surface of the second mounting portion 22 and the back surface of the second hinge portion 21 are flush, i.e., the back surface of the second mounting portion 22 and the back surface of the second hinge portion 21 are in the same plane.

[0054] With this configuration, the back of the second mounting part 22 and the back of the second hinge part 21 can both abut against the inner wall of the device body, which can improve the reliability of the second hinge seat.

[0055] It should be noted that the specific value of the step difference between the back of the second mounting part 22 and the back of the second hinge part 21 is not limited here. For example, the step difference between the back of the second mounting part 22 and the back of the second hinge part 21 can be 5mm-8mm.

[0056] In one embodiment, the back side of the second mounting portion 22 is flush with the back side of the second hinge portion 21, and both the back side of the second mounting portion 22 and the back side of the second hinge portion 21 are planar. The back side of the second mounting portion 22 and the back side of the second hinge portion 21 are flush with each other.

[0057] In one embodiment, the second mounting portion 22 may be provided with multiple grooves, that is, the second mounting portion 22 is provided with a second reinforcing rib, and the back side of the second mounting portion 22 can be understood as the surface of the second reinforcing rib.

[0058] Reference Figures 1c to 1eAs shown, in one disclosed embodiment, the second mounting portion 22 includes a back surface 222 and a bottom surface 223, both of which are planar. The back surface 222 fits against the inner wall of the mounting cavity, and the bottom surface 223 fits against the bottom surface of the mounting cavity 201. Thus, the bottom surface and inner wall of the mounting cavity 201 can limit the bottom and back of the second mounting portion 22, preventing it from tilting backward.

[0059] Reference Figure 1e As shown, in one disclosed embodiment, the thickness d of the second mounting portion 22 gradually increases from the end of the second mounting portion 22 away from the second hinge portion 21 to the end of the second mounting portion 22 closer to the second hinge portion 21.

[0060] Reference Figure 1e As shown, in one disclosed embodiment, the thickness d of the second mounting portion 22 gradually increases from the end of the second mounting portion 22 away from the second hinge portion 21 to the end of the second mounting portion 22 closer to the second hinge portion 21. The second mounting portion 22 also includes a front face 224, which is disposed opposite to the back face of the second mounting portion 22, and the front face 224 and the back face of the second mounting portion 22 are disposed at an angle α, where the angle α is an acute angle.

[0061] Reference Figure 1e As shown, by way of example, the thickness d at the bottom of the second mounting portion 22 is less than the thickness d at the position of the second mounting portion 22 near the second hinge portion 21. That is, the thickness d of the second mounting portion 22 gradually increases from the bottom to the top near the second hinge portion 21.

[0062] Reference Figure 1e As shown, by way of example, the back surface and the bottom surface of the second mounting part 22 can be set at approximately a right angle, and the front surface 224 of the second mounting part 22 is set at an acute angle α relative to the vertical direction, so that the cross-section of the second mounting part 22 is approximately a right trapezoid, and the front surface 224 of the second mounting part 22 is the hypotenuse of the right trapezoid.

[0063] In related art hinge devices, the second mounting portion 22 is generally configured as a flat plate inserted into a flat groove. This results in a gap between the second mounting portion and the flat groove, leading to insufficient tightness in the installation of the second mounting portion 22 and the flat groove. However, in the hinge device of this disclosure, the thickness of the second mounting portion 22 gradually increases from the end of the second mounting portion 22 away from the second hinge portion 21 to the end of the second mounting portion 22 closer to the second hinge portion 21. Furthermore, the front end 224 of the second mounting portion 22 is set at an acute angle to the back end of the second mounting portion 22, meaning the second mounting portion 22 is generally shaped like a right trapezoid. The mounting cavity of the device body can be adapted to the second mounting portion 22 as a right trapezoidal mounting groove. A gap can exist between the bottom surface of the second mounting portion 22 and the mounting cavity. This ensures a tighter fit between the second mounting portion 22 and reduces gaps.

[0064] Reference Figure 1b As shown, in one disclosed embodiment, the first hinge seat 10 further includes a first mounting portion 12, the first hinge portion 11 and the second hinge portion 21 are arranged along the central axis, the first hinge portion 11 and the second hinge portion 21 can be rotatably connected by a connecting shaft, and the first mounting portion 12 and the second mounting portion 22 are respectively located on both sides of the central axis.

[0065] Reference Figure 1b As shown, exemplarily, the first mounting portion 12 and the second mounting portion 22 are located on opposite sides of the central axis. For example, the first mounting portion 12 is generally offset to the left of the central axis, and the second mounting portion 22 is generally offset to the right of the central axis. Alternatively, the first mounting portion 12 is generally offset to the right of the central axis, and the second mounting portion 22 is generally offset to the left of the central axis.

[0066] For example, the first mounting portion 12 and the second mounting portion 22 are respectively located on different sides of the first hinge seat and the second hinge seat. For instance, when the opening and closing device is in the closed state, the second mounting portion 22 is located on the back side of the second hinge portion 21 near the mounting cavity, and the first mounting portion 12 is located on the back side of the first hinge portion 11 away from the mounting cavity. The back side of the mounting cavity is adapted to the back side of the second mounting portion 22.

[0067] Reference Figure 1e As shown, in one disclosed embodiment, the thickness d of the second mounting portion 22 is 10mm-14mm. Exemplarily, the thickness d of the second mounting portion 22 can be understood as the average thickness of the second mounting portion 22, or it can also be understood as the thickness of the second mounting portion 22 at all positions in the height direction. For example, the thickness d of the second mounting portion 22 can be 10mm, 10.8mm, 11mm, 12mm, 13mm, 14mm, etc. The specific value of the thickness d of the second mounting portion 22 can be set according to actual usage requirements.

[0068] Reference Figure 1eAs shown, in one disclosed embodiment, the sum of the heights h of the back surfaces of the second mounting portion 22 and the second hinge portion 21 is less than 40 mm. Exemplarily, the back surface of the second hinge portion 21 can represent the planar portion adjacent to the second mounting portion 22. The sum of the heights h of the back surfaces of the second mounting portion 22 and the second hinge portion 21 is less than 40 mm. Designing the back surfaces of the second mounting portion 22 and the second hinge portion 21 too high would result in an excessively high mounting box for the corresponding device body, potentially affecting the transportation of the opening and closing device and also potentially impacting the internal structure of the opening and closing device body. Setting the sum of the heights of the back surfaces of the second mounting portion 22 and the second hinge portion 21 to be less than 40 mm is appropriate, saving materials and facilitating transportation. Furthermore, the height of the second mounting portion 22 can be set as needed to ensure a more stable hinge device.

[0069] Refer to 1b. Figure 2a and Figure 2b As shown, in one disclosed embodiment, the first hinge seat 10 further includes a first mounting portion 12, on which a first mounting hole 121 is provided. The first mounting hole 121 is used to cooperate with a fastener to fix the first mounting portion 12 to the door body of the opening and closing device. For example, the first hinge seat 10 can be connected to the side wall of the door body through the first mounting portion 12 and rotate with the door body. When the door body and the main body of the opening and closing device are closed, the first hinge portion 11 and the second hinge portion 21 can be regarded as being on the same plane.

[0070] Reference Figure 2a and Figure 2b As shown, for example, the number of first mounting holes 121 can be multiple, for example, the number of first mounting holes 121 can be three. The number, shape and size of the first mounting holes 121 can be set according to actual usage requirements.

[0071] Reference Figure 1b As shown, in one disclosed embodiment, the first hinge seat 10 further includes a first mounting portion 12, which is integrally formed with the first hinge portion 11, and the second mounting portion 22 and the second hinge portion 21 are integrally formed. Exemplarily, the first hinge portion 11 and the first mounting portion 12 can be injection molded into an integral structure, and the second hinge portion 21 and the second mounting portion 22 can be injection molded into an integral structure.

[0072] Reference Figure 1b , Figure 1d , reference Figure 2aAs shown, in one disclosed embodiment, the first hinge seat 10 further includes a first mounting portion 12, on which a first reinforcing rib 13 is provided, and a second reinforcing rib 23 is provided on the second mounting portion 22. Exemplarily, the second mounting portion 22 is provided with the second reinforcing rib 23, which is located on the side of the second mounting portion 22 that is in contact with the side wall of the mounting cavity. There can be multiple second reinforcing ribs 23, and they can be arranged in a regularly intersecting pattern, forming a rhomboid or square grid. The specific shape and number of the second reinforcing ribs 23 are not limited here. The back surface of the second reinforcing rib 23 is flat, and the second reinforcing rib 23 at least partially overlaps the second hinge portion 21. There can be multiple first reinforcing ribs 13, which can be arranged in a regularly intersecting pattern. In this disclosed embodiment, the reinforcing ribs on the first mounting portion 12 and the second mounting portion 22 enhance the structural strength of the first mounting portion 12 and the second mounting portion 22.

[0073] Reference Figure 1b , Figure 1c , Figure 2a , Figure 2b As shown, in one disclosed embodiment, the hinge device further includes a second limiting structure 30. The second limiting structure 30 includes a first limiting protrusion 31 and a first limiting groove 32. The first limiting protrusion 31 is disposed on the side of the first mounting portion 12 near the second hinge portion 21, and the first limiting groove 32 is disposed on the side of the second mounting portion 22 near the first hinge portion 11. The first limiting protrusion 31 and the first limiting groove 32 cooperate to limit the maximum opening and closing angle of the door body of the opening and closing device.

[0074] The first limiting protrusion 31 is a block structure rather than a strip structure. This ensures that the hinge mechanism does not fail within a certain range of opening force, while exceeding that range allows it to fail but not break. For example, if the design requires the hinge mechanism to remain in place when the door is pushed with a force of 0-80N, the first limiting protrusion 31 and the first limiting groove 32 are used to achieve this limitation. If the design requires the hinge to fail when the door is pushed with a force exceeding 80N, it will not break; the first limiting protrusion will break at approximately 80N. This prevents the hinge from breaking when the door is pushed with greater force, instead causing it to over-rotate and fail.

[0075] Reference Figure 1b , Figure 1d , Figure 2b , Figure 3aAs shown, in one disclosed embodiment, the hinge device further includes a piston 40, an elastic element 50, and a connecting shaft 60. The first hinge portion 11 has a first mating structure 113, and the second hinge portion 21 is provided with a second receiving cavity 211 and a second opening 212. The piston 40 is disposed within the second receiving cavity 211, and the piston 40 has a second mating structure 41. The second mating structure 41 abuts against the first mating structure 113 through the second opening 212, and the first hinge seat 10 and the second hinge seat 20 are capable of reciprocating relative to each other in the abutting state. The elastic element 50 is disposed within the second receiving cavity 211 and located at the end of the piston 40 opposite to the second mating structure 41. The elastic element 50 provides assistance in the abutting state. The connecting shaft 60 passes through the first hinge portion 11, the piston 40, the elastic element 50, and the second hinge portion 21, so that the first hinge portion 11 and the second hinge portion 21 are fixed relative to each other axially.

[0076] Reference Figure 1b , Figure 2b , Figure 3a As shown, exemplarily, the first hinge portion 11 is provided with a first receiving cavity 111, the first receiving cavity 111 is provided with a first opening 112, the first opening 112 is opposite to and communicates with the second opening 212, and a first mating structure is provided in the first receiving cavity 111. One end of the first hinge portion 11 with the first opening 112 is connected to one end of the second hinge portion 21 with the second opening 212.

[0077] The hinge device of this embodiment, because the elastic element 50 can provide assistance in the abutment state, can alleviate the problem of violent collision between the door and the housing caused by the rapid descent of the door during the closing process, thus improving the user experience. Meanwhile, the piston 40 and the elastic element 50 are both disposed within the second receiving cavity 211 of the second hinge seat 20. Furthermore, the first hinge seat 10, the second hinge seat 20, the piston 40, and the elastic element 50 can be assembled and connected via the connecting shaft 60, making the hinge device simple, easy to assemble, and reducing the space occupied by the hinge device.

[0078] Reference Figure 2b and Figure 3a As shown, a first limiting structure 80 is provided between the abutting surfaces of the first mating structure 113 and the second mating structure 41. The first limiting structure 80 includes a first limiting part 81 located on the first mating structure 113 and a second limiting part 82 located on the second mating structure 41. When the hinge device is in the initial state, the first limiting part 81 and the second limiting part 82 are engaged in a limiting fit.

[0079] For example, when the hinge device is in its initial state, the first limiting part 81 and the second limiting part 82 engage to position the hinge device in its initial state, preventing changes in the initial state due to transportation or other external forces. For instance, when the angle between the first hinge seat 10 and the second hinge seat 20 is less than 180°, the first limiting part 81 and the second limiting part 82 engage. For example, if the angle between the first hinge seat and the second hinge seat is 175°, the first limiting part 81 and the second limiting part 82 engage. When the hinge device is actually assembled on the housing of the opening and closing device, the angle between the first hinge seat and the second hinge seat is greater than 180° during normal use. During normal use, the first limiting part 81 and the second limiting part 82 are misaligned, thus rendering them almost ineffective and preventing any impact on the normal use of the hinge device.

[0080] The hinge device of this embodiment achieves initial positioning by providing a first limiting structure 80 between the abutting surfaces of the first mating structure 113 and the second mating structure 41, thus preventing the protrusion from falling off and reducing the structural strength of the second hinge seat. Furthermore, the first limiting structure 80 is hidden between the abutting surfaces of the first mating structure 113 and the second mating structure 41, avoiding affecting the overall neatness and aesthetics of the hinge device.

[0081] Reference Figures 2a-2b , Figures 3a-3b As shown, in one disclosed embodiment, the second mating structure 41 includes a first helical surface 42 and a first top surface 43, and the first mating structure 113 includes a first mating surface 114 and a second top surface 115. One end of the first top surface 43 is connected to the top end of the first helical surface 42. The first helical surface 42 and the first mating surface 114 mate with each other, and the first top surface 43 and the second top surface 115 correspond to each other. A first limiting part 81 is disposed on the second top surface 115, and a second limiting part 82 is disposed on the first top surface 43. When the hinge device is in the open state, the first helical surface 42 and the first mating surface 114 abut against each other.

[0082] In this embodiment of the hinge device, the first helical surface 42 is used to support the door body to achieve a balanced state when the door is opened, so that the door body can achieve a hovering effect. The first top surface 43 is provided with a second limiting part 82, and the second top surface 115 is provided with a first limiting part 81. The first top surface 43 and the second top surface 115 cooperate to limit the relative position of the first hinge seat 10 and the second hinge seat 20 before the hinge device is installed and used, so as to prevent the hinge device from accidentally popping open during storage and transportation.

[0083] Reference Figure 2b , Figure 3aAs shown, exemplarily, the first limiting part 81 is a protrusion, and the second limiting part 82 is a recess that matches the protrusion. Alternatively, the first limiting part 81 is a recess, and the second limiting part 82 is a protrusion that matches the recess. It should be noted that the specific shape and size of the protrusion and the recess are not limited here, as long as they can satisfy the initial state of the limiting and engaging hinge device.

[0084] For example, the recessed portion has a roughly circular cross-sectional shape, and the protruding portion also has a roughly circular cross-sectional shape. The diameter of the recessed portion is greater than or equal to the diameter of the protruding portion. This arrangement allows the protruding portion to be more easily inserted into the recessed portion, making piston assembly easier, more forgiving, and more effective.

[0085] Reference Figure 1d , Figures 3a-3b As shown, in one disclosed embodiment, the sidewall of the piston 40 is provided with an axially extending guide groove 44, and the sidewall of the second receiving cavity 211 is provided with a corresponding guide protrusion 213. The guide protrusion 213 is disposed within the guide groove 44. When the opening and closing device is at the maximum opening angle, the guide protrusion 213 abuts against the limiting protrusion 115, which can help limit the maximum opening angle.

[0086] In one disclosed embodiment, the hinge device further includes fasteners connected to both ends of the connecting shaft 60 to fix the first hinge seat 10 and the second hinge seat 20 axially relative to each other.

[0087] Reference Figure 1b As shown, in one disclosed embodiment, the hinge device further includes a washer 70, the washer 70 having a non-circular hole 71 at its center, and the end of the connecting shaft 60 passing through the non-circular hole 71 and riveted to the washer 70.

[0088] Reference Figure 1b As shown, exemplarily, the washer 70 has a polygonal hole at its center, and the end of the connecting shaft 60 passes through the polygonal hole and is riveted to the washer. For example, the polygonal hole of the washer 70 is a regular hexagon. This arrangement ensures that the washer 70 and the connecting shaft 60 are relatively fixed when riveted, serving as a limiting function and preventing damage. Because the continuous friction caused by the relative rotation of the connecting shaft 60 and the washer 70 may cause strength problems, such as wearing down the riveted part, thereby affecting the strength of the hinge device, the present disclosure embodiment uses a polygonal hole instead of a circular hole to avoid damage.

[0089] Reference Figure 3bAs shown, in one disclosed embodiment, the piston 40 is provided with weight-reducing holes 45. The number of weight-reducing holes 45 can be one or more, and the multiple weight-reducing holes 45 are arranged circumferentially at intervals based on the central axis of the piston 40 itself. This arrangement can reduce the weight of the piston 40 and the hinge device, and avoid injection molding defects that occur when the piston 40 is solidly injection molded.

[0090] Reference Figure 2b , Figure 3a and Figure 3b As shown, in one disclosed embodiment, a first positioning protrusion 46 is provided at the bottom end of the piston 40 along the center, and the first positioning protrusion 46 is used to position the elastic member 50. A second positioning protrusion 214 is provided at the bottom end of the second receiving cavity 211 along the center, and the second positioning protrusion 214 is used to position the elastic member 50.

[0091] The hinge device of this embodiment uses the first positioning protrusion 46 and the second positioning protrusion 214 to position the elastic member 50, which can prevent the elastic member 50 from shaking and reduce the wear of the elastic member 50. Moreover, when the bottom end of the second hinge seat 20 is provided with a countersunk hole corresponding to the fastener at the end of the connecting shaft, the second positioning protrusion 214 can also improve the structural strength of the second hinge seat 20.

[0092] Reference Figures 1a-1b , Figure 1f As shown, this disclosure also provides an opening and closing device, which includes a device body 200 and a door. The device body 200 has a third opening, and the outer wall of the device body 200 has a mounting cavity 201 recessed into the device body. The mounting cavity 201 has a fourth opening 202 facing outward from the device body 200. The door is closably connected to the third opening of the device body 200 by a hinge device 100 as described in any of the embodiments of this disclosure. A first hinge seat 10 is connected to the side wall of the door, a second hinge portion 21 is at least partially located within the mounting cavity 201, and a second mounting portion 22 is mounted and embedded in the mounting cavity 201.

[0093] In this embodiment, the second mounting part 22 is provided with a spring-loaded structure 90 at its front. This spring-loaded structure engages with the first engaging groove of the mounting cavity. The free end 91 of the spring-loaded structure is positioned away from the fixed end 92 of the second hinge part 21. The spring-loaded structure 90 can be integrally engaged and installed in the first engaging groove, thereby securing the second mounting part 22 within the mounting cavity 201 of the opening and closing device body 200, improving the reliability of the second mounting part's fixation. The mounting cavity 201 further limits the movement of the second mounting part 22, preventing the hinge from tilting backward under force, achieving an anti-tilting effect, improving the stability and reliability of the hinge, and preventing the hinge from loosening after long-term use.

[0094] For example, the second mounting part 22 can be fixedly connected to the device body 200 via a spring clip structure 90. This allows the user to easily fix it without screws.

[0095] It should be noted that the second mounting part 22 can also be provided with screw holes, and the second mounting part 22 can also be fixed by screws. For example, for opening and closing devices with a large door body, such as those used for glass doors, a screwless solution may not provide sufficient stability. Therefore, screws can be used for fixing, or a combination of screws and spring clips can be used to enhance stability. For lighter door bodies, a screwless solution can be used, which can further reduce costs and improve production efficiency.

[0096] For example, the opening and closing device can be a freezer, such as a top-opening horizontal freezer, or other devices that can be opened and closed, such as a dishwasher or a storage cabinet.

[0097] Reference Figure 1f As shown, exemplarily, the mounting cavity 201 includes a first cavity and a second cavity, which are respectively connected to the outer side wall of the device body. The first cavity and the second cavity are arranged along the axis of the hinge device and are connected to each other. The first hinge portion 11 is mounted through the first cavity, with a portion of the first hinge portion 11 located within the first cavity and a portion of the first hinge portion 11 extending outside the first cavity. The second mounting portion 22 is located within the second cavity, and the second hinge portion 21 is at least partially located within the second cavity.

[0098] Refer to Figure 1b , 1f As shown, in one disclosed embodiment, the mounting cavity 201 includes a first part and a second part, the second part being located at the lower end of the first part, the second hinge portion 21 being at least partially located within the first part, and the second mounting portion 22 being snapped into the second part.

[0099] In one embodiment, the device body 200 includes a frame portion 200a, which has a mounting cavity 201. Exemplarily, the frame portion 200a can be detachably mounted on the device body 200, or the frame portion 200a can be integrally formed with the device body. The mounting cavity 201 can cooperate with a second mounting portion 22, meaning the second mounting portion 22 can be installed and embedded within the mounting cavity 201.

[0100] In one embodiment, there are two spring-loaded structures 90, which are spaced apart and positioned at the front of the second mounting portion 22 near the front sidewall. The free end 91 of the spring-loaded structure 90 is wedge-shaped. A first snap-fit ​​groove 203 is provided on the front sidewall 2011 of the mounting cavity 201, and the free end 91 of the elastic structure 90 is adapted to the first snap-fit ​​groove 203 to fix the second mounting portion 22.

[0101] For example, when the second mounting part 22 is inserted along the mounting cavity 201, the thickness of the second mounting part 22 is approximately equal to the thickness of the mounting cavity 201. The free end 91 of the spring structure 90 protrudes from the front of the second mounting part 22, so that the free end 91 of the spring structure 90 is subjected to the pressure of the front side wall 2011 of the mounting cavity 201, thereby elastically contracting into the receiving groove. When the second mounting part 22 is inserted into place, that is, when the spring structure 90 is in place in the first locking groove 203, the free end 91 of the spring structure 90 restores its elastic deformation and locks into the first locking groove 203, thereby fixing the second mounting part 22 and the mounting cavity.

[0102] For example, the first locking groove 203 is provided through the front side wall 2011 of the mounting cavity 201, so that a tool can be inserted into the first locking groove 203 to push out the spring structure 90, which facilitates the disassembly of the hinge device.

[0103] In one disclosed embodiment, the mounting cavity 201 includes a first sidewall B1 and a second sidewall B2 located on both sides. The second sidewall B2 is disposed near the first hinge portion, and at least a portion of the first and second sidewalls are inclined relative to the vertical direction. A first wedge portion 24 and a second wedge portion 25 are respectively disposed on both sides of the second hinge seat 20. The first wedge portion 24 is fitted with the first sidewall B1, and the second wedge portion 25 is fitted with the second sidewall.

[0104] Reference Figures 4a to 4d As shown, the mounting cavity 201 includes a first part 201a and a second part 201b. The second part 201b is located at the lower end of the first part 201a. The first part 201a includes a first sidewall B1 and a second sidewall B2. The second sidewall B2 is disposed near the first hinge portion 10. The first sidewall B1 and the second sidewall B2 are disposed at an inclination relative to the vertical direction. A first wedge portion 24 and a second wedge portion 25 are respectively disposed on both sides of the second hinge portion 21. The first wedge portion 24 is fitted and assembled with the first sidewall B1, and the second wedge portion 25 is fitted and assembled with the second sidewall B2.

[0105] It should be noted that at least a portion of the first and second sidewalls are inclined relative to the vertical direction. This can be understood as a portion of the first and second sidewalls being inclined relative to the vertical direction, or a portion of the first and second sidewalls having inclined surfaces. Figure 4a and Figure 4b As shown, the upper part of the mounting cavity, namely the first part 201a, has its two side walls inclined relative to the vertical direction. The side walls of the second part 201b are not limited here.

[0106] For example, the first sidewall B1 and the second sidewall B2 represent the left and right sides of the first part. Figure 4a The side walls on both sides (left and right) are arranged with the first side wall B1 inclined relative to the vertical direction. The distance between the outer end of the first side wall B1 and the first hinge is smaller than the distance between the inner end of the second side wall and the first hinge. The inclination angle of the first side wall B1 is not limited here and can be set according to actual use needs.

[0107] For example, the second sidewall B2 is inclined relative to the vertical direction, and the distance between the outer end of the second sidewall B2 and the center of the mounting cavity is less than the distance between the inner end of the second sidewall B2 and the center of the mounting cavity. The inclination angle of the second sidewall B2 is not limited here. The first sidewall B1 and the second sidewall B2 together form a figure-eight shape.

[0108] The first sidewall B1 and the second sidewall B2 of the first part 201a of the mounting cavity in this embodiment are inclined and respectively cooperate with the first wedge-shaped part and the second wedge-shaped part, thereby increasing the strength by adding two force points between the device body and the second mounting part.

[0109] When the sidewalls of the frame of the main body 200 are vertical, during door opening or hinge strength testing, the force on the frame of the main body 200 is entirely borne by the protruding edge of the front opening, which may affect the strength of the hinge. However, this embodiment addresses this by providing a first wedge-shaped portion 24 on one side of the second mounting portion to engage with the inclined surface of the first sidewall B1, and a second wedge-shaped portion 25 on the other side of the second mounting portion to engage with the inclined surface of the second sidewall B2. This adds two stress points to the frame, further increasing the overall strength.

[0110] Reference Figures 5a to 5d As shown, in one disclosed embodiment, the mounting cavity 201 includes a first sidewall B1 and a second sidewall B2 located on both sides, with the second sidewall B2 disposed near the first hinge portion 10. At least a portion of the first sidewall B1 and the second sidewall B2 are inclined relative to the vertical direction. A first wedge-shaped portion 24 is located on one side of the second hinge portion 21 and the second mounting portion 22, and a second wedge-shaped portion 25 is located on the other side of the second hinge portion 21 and the second mounting portion 22. The first wedge-shaped portion 24 is fitted to the first sidewall B1, and the second wedge-shaped portion 25 is fitted to the second sidewall B2.

[0111] For example, the first sidewall B1 and the second sidewall B2 are at least partially inclined relative to the vertical direction. This can be understood as the first sidewall B1 and the second sidewall B2 being divided into an inclined portion and a vertical portion in the width direction of the mounting cavity. One end of the vertical portion is connected to the back of the mounting cavity, and the other end of the vertical portion is connected to the inclined portion. The portion of the inclined portion connected to the vertical portion is disposed away from the mounting cavity relative to the other end of the inclined portion.

[0112] like Figure 5a and 5b As shown, the fact that the first sidewall B1 and the second sidewall B2 are at least partially inclined relative to the vertical direction can be understood as the first sidewall B1 and the second sidewall B2 being divided into two parts in the vertical direction, one of which is inclined relative to the vertical direction. The end face shapes of the first wedge-shaped portion 24 and the second wedge-shaped portion 25 can be adapted to the shapes of the first sidewall B1 and the second sidewall B2, so that the first wedge-shaped portion 24 and the second wedge-shaped portion 25 can be fitted and assembled with the first sidewall B1 and the second sidewall B2.

[0113] When the sidewalls of the frame of the main body 200 are vertical, during door opening or hinge strength testing, the force on the frame of the main body 200 is entirely borne by the protruding edge of the front opening, which may affect the strength of the hinge. However, this embodiment addresses this by providing a first wedge-shaped portion 24 on one side of the second mounting portion and the second hinge portion to engage with the inclined surface of the first sidewall B1, and a second wedge-shaped portion 25 on the other side of the second mounting portion and the second hinge portion to engage with the inclined surface of the second sidewall B2. This increases the number of stress points on the frame, further enhancing its overall strength.

[0114] It should be noted that the first wedge-shaped portion 24 can also be integrally disposed on one side of the second mounting portion 22, and the second wedge-shaped portion 25 can also be integrally disposed on the other side of the second mounting portion 22.

[0115] In one disclosed embodiment, a first clearance portion 204 is further provided in the mounting cavity 201. The first clearance portion 204 is located between the bottom of the mounting cavity 201 and the front sidewall 2011. A third wedge-shaped portion 26 is further provided at the bottom end of the second mounting portion 22. The third wedge-shaped portion 26 is fitted and assembled with the first clearance portion 204.

[0116] For example, the first clearance portion 204 is located between the bottom of the mounting cavity 201 and the front sidewall 2011. The first clearance portion 204 is an inclined surface that cooperates with the third wedge-shaped portion 26. The inclination angle of the first clearance portion 204 can be set according to actual usage requirements. By setting the first clearance portion 204 and the third wedge-shaped portion 26 to cooperate, the overall strength can be further increased in this embodiment of the disclosure.

[0117] The above detailed description is a specific description of the feasible embodiments of this disclosure. These embodiments are not intended to limit the scope of protection of this disclosure. All equivalent implementations or modifications that do not depart from this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A hinge device, characterized in that, include The first hinge seat includes a first hinge portion; The second hinge seat includes a second hinge part and a second mounting part. The second hinge part is rotatably connected to the first hinge part. The second mounting part is used to install and embed in the mounting cavity of the opening and closing device body. The mounting cavity includes a front sidewall. The front of the second mounting part near the front sidewall is provided with a spring structure and a receiving groove. The spring sheet structure and the receiving groove are arranged along the height direction of the second mounting part. The receiving groove is arranged through the front of the second mounting part. The spring sheet structure includes a fixed end and a free end. The fixed end is connected to the top of the receiving groove. The free end protrudes at least partially from the front of the second mounting part. After the free end of the spring sheet structure is pressed, the free end can elastically retract close to the receiving groove.

2. The hinge device according to claim 1, characterized in that, The receiving groove is provided through the bottom of the second mounting part; and / or, the spring sheet structure includes a flat plate part and a wedge-shaped part, one end of the flat plate part is connected to the top of the receiving groove to form the fixed end, the other end of the flat plate part is connected to the wedge-shaped part, and the wedge-shaped part forms the free end.

3. The hinge device according to claim 2, characterized in that, The flat plate is located in the receiving groove, and the wedge-shaped part is connected to the flat plate to form a step. The wedge-shaped part protrudes from the front and includes a planar positioning surface. An inclined surface is formed between the positioning surface and the bottom surface of the wedge-shaped part.

4. The hinge device according to claim 1, characterized in that, The thickness of the second mounting part is less than the diameter of the second hinge part, and the step difference between the back surface of the second mounting part and the back surface of the second hinge part is less than or equal to a preset value.

5. The hinge device according to claim 4, characterized in that, The back of the second mounting part is flat and fits against the inner wall of the mounting cavity; and / or, the thickness of the second mounting part gradually increases from the end of the second mounting part away from the second hinge part to the end of the second mounting part closer to the second hinge part; and / or, the second mounting part also includes a front side, which is disposed opposite to the back of the second mounting part, and the front side and the back of the second mounting part form an acute angle.

6. The hinge device according to claim 4, characterized in that, The thickness of the second mounting part is 10mm-14mm; and / or the sum of the heights of the back of the second mounting part and the back of the second hinge part is less than 40mm.

7. The hinge device according to claim 1, characterized in that, The first hinge seat also includes a first mounting part. When the opening and closing device is in the closed state, the second mounting part is disposed on the side of the second hinge part near the back of the mounting cavity, and the first mounting part is disposed on the side of the first hinge part away from the back of the mounting cavity.

8. The hinge device according to claim 1, characterized in that, The first hinge seat further includes a first mounting portion, which has a first mounting hole for engaging with a fastener to fix the first mounting portion to the door body of the opening and closing device; and / or, The first hinge seat further includes a first mounting portion, which is integrally formed with the first hinge portion; the second mounting portion and the second hinge portion are integrally formed; and / or, The first hinge seat further includes a first mounting part, on which a first reinforcing rib is provided, and on which a second mounting part is provided a second reinforcing rib.

9. The hinge device according to claim 8, characterized in that, The hinge device further includes a second limiting structure, which includes a first limiting protrusion and a first limiting groove. The first limiting protrusion is disposed on the side of the first mounting part near the second hinge part, and the first limiting groove is disposed on the side of the second mounting part near the first hinge part. When the door of the opening and closing device is at its maximum opening and closing angle, the limiting protrusion is at least partially engaged and pressed into the limiting groove.

10. The hinge device according to any one of claims 1 to 9, characterized in that, The hinge device also includes: The piston has a first hinge portion having a first mating structure, and a second hinge portion having a second receiving cavity and a second opening. The piston is disposed in the second receiving cavity and has a second mating structure. The second mating structure abuts against the first mating structure through the second opening. An elastic element is disposed within the second receiving cavity and located at one end of the piston away from the second mating structure; the elastic element can provide assistance for the abutting state. A connecting shaft passes through the first hinge portion, the piston, the elastic element, and the second hinge portion, so that the first hinge portion and the second hinge portion are fixed relative to each other along the axial direction.

11. The hinge device according to claim 10, characterized in that, A first limiting structure is provided between the abutting surfaces of the first mating structure and the second mating structure. The first limiting structure includes a first limiting part located on the first mating structure and a second limiting part located on the second mating structure. When the hinge device is in the initial state, the first limiting part and the second limiting part are mutually limitingly engaged. The first limiting part is a protrusion, and the second limiting part is a recessed part adapted to the protrusion, or the first limiting part is a recessed part, and the second limiting part is a protrusion adapted to the recessed part. The diameter of the recessed part is greater than or equal to the diameter of the protrusion.

12. The hinge device according to claim 11, characterized in that, The second mating structure includes a first spiral 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 spiral surface. The first spiral surface and the first mating surface mate with each other. The first top surface and the second top surface correspond to each other. The first limiting part is disposed on the second top surface, and the second limiting part is disposed on the first top surface. When the hinge device is in the open state, the first spiral surface and the first mating surface abut against each other.

13. An opening and closing device, characterized in that, The opening and closing device includes: The device body has a third opening, and the outer side wall of the device body has a mounting cavity recessed into the device body. The mounting cavity has a fourth opening facing the outer side of the device body. A door body, which is closably connected to the third opening of the device body via a hinge device as described in any one of claims 1 to 12, wherein the first hinge seat is connected to the side wall of the door body, and the second hinge portion is at least partially located within the mounting cavity, and the second mounting portion is installed and embedded in the mounting cavity.

14. The opening and closing device according to claim 13, characterized in that, The front sidewall of the mounting cavity includes a first wall near the bottom and a second wall above the first wall. The second wall is located at the fourth opening and has a first snap-fit ​​groove. The free end of the spring structure is adapted to the first snap-fit ​​groove to fix the second mounting part.

15. The opening and closing device according to claim 14, characterized in that, The main body of the device includes a frame portion, the frame portion being provided with the mounting cavity, and the first snap-fit ​​groove penetrating the second wall.

16. The opening and closing device according to claim 13, characterized in that, The mounting cavity includes a first sidewall and a second sidewall located on both sides. The second sidewall is disposed near the first hinge portion, and at least a portion of the first sidewall and the second sidewall are inclined relative to the vertical direction. The second hinge seat has a first wedge-shaped portion and a second wedge-shaped portion on both sides. The first wedge-shaped portion is fitted to the first sidewall, and the second wedge-shaped portion is fitted to the second sidewall. The first wedge-shaped portion and the second wedge-shaped portion are located on the second mounting portion; and / or, the first wedge-shaped portion and the second wedge-shaped portion are located on the second hinge portion; and / or The mounting cavity is further provided with a first clearance portion, which is located between the bottom of the mounting cavity and the front sidewall. The bottom end of the second mounting portion is provided with a third wedge-shaped portion, which fits and is assembled with the first clearance portion.

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