Opening and closing device

Abstract

The utility model relates to the technical field of household appliances, and discloses an opening and closing device which comprises a box body and a door body, the box body is provided with an opening, the door body is connected to the opening in a pivoted mode through a hinge assembly, the hinge assembly comprises a hinge base, two connecting pieces and two elastic pieces, and two hinge shaft sleeves are arranged at one end of the hinge base in the axial direction of the hinge base at intervals. One ends of the two connecting pieces are inserted into one of the two hinge shaft sleeves respectively and are rotationally connected with the hinge shaft sleeves, the other ends, deviating from the hinge base, of the connecting pieces are connected with the door body, and the two elastic pieces are installed at the ends, inserted into the hinge shaft sleeves, of the two connecting pieces one by one and are connected with the two hinge shaft sleeves one by one. Compared with the prior art, by arranging the two elastic piece structures, uniform torque can be provided, the hinge assembly moves more stably in the opening and closing process, the stress borne by each elastic piece is relatively small, and therefore the service life of the elastic pieces is prolonged, and the stability and reliability of opening and closing of the door body are improved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to an opening and closing device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Household appliances such as freezers, refrigerators, and dishwashers typically consist of a cabinet and a door that can be opened and closed relative to the cabinet. The door and cabinet are connected by a hinge assembly to open or close. The hinge assembly in related technologies generally uses a single torsion spring structure, which has low torque and is prone to uneven force when the door is opened and closed, resulting in problems such as door tilting and wobbling. Utility Model Content

[0004] The purpose of this invention is to at least solve the problem of uneven force distribution on the door during opening and closing. This purpose is achieved through the following technical solution:

[0005] This utility model proposes an opening and closing device, comprising:

[0006] The box has an opening;

[0007] The door body is pivotally connected to the opening via a hinge assembly;

[0008] The hinge assembly includes a hinge base, two connectors, and two elastic elements. One end of the hinge base has two hinge bushings spaced apart along the axial direction of the hinge assembly, and the other end is connected to the housing. One end of each of the two connectors is inserted into one of the two hinge bushings and rotatably connected to the hinge bushing. The other end of each connector, away from the hinge base, is connected to the door body. The two elastic elements are installed one at a time on the two connectors inserted into the hinge bushings and connected to the two hinge bushings. The elastic elements are used to apply an auxiliary force to the door body to rotate in the opening direction.

[0009] The hinge assembly of the opening and closing device of this utility model is provided with a hinge base, two connecting parts and two elastic parts. The two connecting parts are respectively inserted into two hinge bushings, and the two elastic parts are connected to the hinge bushings one by one. The structure of the two elastic parts can provide a more uniform torque, so that the hinge assembly moves more smoothly during the opening and closing of the door, and the stress borne by each elastic part is relatively small, thereby extending the service life of the elastic parts and improving the stability and reliability of the door opening and closing.

[0010] In addition, the opening and closing device according to this utility model may also have the following additional technical features:

[0011] In some embodiments of this utility model, the hinge seat includes a first mounting plate, one end of which is connected to the two hinge bushings, and the other end of which is connected to the housing. The connecting member includes a rotating shaft, which is rotatably mounted inside the hinge bushings. An elastic element is sleeved on the rotating shaft, and one end of the elastic element is connected to the first mounting plate, and the other end of the elastic element is connected to the rotating shaft.

[0012] In some embodiments of this utility model, the elastic element is a torsion spring.

[0013] In some embodiments of this utility model, each of the connecting members has an assembly groove at one end inserted into the hinge bushing, and one end of the torsion spring is installed in the assembly groove.

[0014] In some embodiments of this utility model, the connector further includes a second mounting plate, which is connected to the rotating shaft and extends along the axial direction of the rotating shaft, and is mounted on the door body.

[0015] In some embodiments of this invention, the thickness of the second mounting plate is less than the diameter of the rotating shaft.

[0016] In some embodiments of this utility model, a mating structure is provided between the hinge bushing and the rotating shaft. The mating structure is configured to restrict the relative axial movement of the rotating shaft and the hinge bushing, and to limit the maximum angle of relative rotation between the rotating shaft and the hinge bushing.

[0017] In some embodiments of this utility model, the mating structure includes a guide portion and a mating portion. The guide portion is disposed on one of the hinge bushing and the rotating shaft, and the mating portion is disposed on the other of the hinge bushing and the rotating shaft. The guide portion includes a guide groove or a guide hole, and the mating portion is slidably connected to the guide portion.

[0018] In some embodiments of this utility model, the rotating shaft is provided with a connecting hole, and the mating part includes a sliding member, which is inserted into the connecting hole and slidably connected to the guide groove or the guide hole.

[0019] In some embodiments of this utility model, the outer wall surface of the door body is provided with a mounting cavity recessed into the door body, the mounting cavity accommodating at least part of the hinge assembly, the hinge seat being connected to the housing, both of the connecting members being connected to the door body, and the pivot axis of the hinge assembly being located within the mounting cavity. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 A schematic diagram of the opening and closing device according to an embodiment of the present invention is shown.

[0022] Figure 2 for Figure 1 Cross-sectional view at point AA;

[0023] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0024] Figure 4 A schematic diagram of the hinge assembly of an opening and closing device according to an embodiment of the present invention is shown.

[0025] Figure 5 An exploded view of the hinge assembly of an opening and closing device according to an embodiment of the present invention is shown schematically.

[0026] The attached figures are labeled as follows:

[0027] 100. Opening and closing equipment;

[0028] 1. Enclosure; 11. Opening; 12. Mounting section;

[0029] 2. Door body; 21. Mounting cavity; 22. First surface; 23. Second surface; 24. Reference plane;

[0030] 3. Hinge assembly; 31. Hinge seat; 311. Hinge bushing; 312. First mounting plate; 3121. First mounting hole; 3122. Assembly hole; 32. Connector; 321. Rotating shaft; 3211. Assembly groove; 3212. Connecting hole; 322. Second mounting plate; 3221. Second mounting hole; 33. Elastic element; 331. Torsion spring;

[0031] 4. Mating structure; 41. Mating part; 411. Slider; 42. Guide part; 421. Guide groove;

[0032] P, pivot axis; X, first direction. Detailed Implementation

[0033] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0034] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0037] Household appliances such as freezers, refrigerators, and dishwashers typically consist of a cabinet and a door that can be opened and closed relative to the cabinet. The door and cabinet are connected by a hinge assembly to open or close. The hinge assembly in related technologies generally uses a single torsion spring structure, which has low torque and is prone to uneven force when the door is opened and closed, resulting in problems such as door tilting and wobbling.

[0038] In view of this, this embodiment provides an opening and closing device 100, which aims to improve the stability and reliability of the door opening and closing by setting a structure with two elastic elements, so as to make the hinge assembly 3 move more smoothly during the opening and closing of the door body 2, thereby solving the above-mentioned technical problems.

[0039] like Figures 1 to 5 As shown, according to an embodiment of the present invention, an opening and closing device 100 is proposed, including a housing 1 and a door 2.

[0040] The housing 1 has an opening 11. The door 2 is pivotally connected to the opening 11 via a hinge assembly 3. The hinge assembly 3 includes a hinge base 31, two connectors 32, and two elastic elements 33. One end of the hinge base 31 has two hinge bushings 311 spaced apart along the axial direction of the hinge assembly 3, and the other end is connected to the housing 1. One end of each connector 32 is inserted into one of the two hinge bushings 311, i.e., one end of each connector 32 is inserted into the hinge bushing 311 and rotatably connected to the hinge bushing 311. The other end of each connector 32 away from the hinge base 31 is connected to the door 2. The two elastic elements 33 are installed one by one at the end of each connector 32 inserted into the hinge bushing 311 and connected to each of the two hinge bushings 311. The elastic elements 33 are used to apply an auxiliary force to the door 2 to rotate in the opening direction. The function of the elastic element 33 is to apply an elastic force to the door 2 to assist in opening, making the door 2 easier to open, or in some cases, to achieve the effect of the door 2 being suspended.

[0041] The number of hinge components 3 can be one or more (two or more) depending on the weight of the door body 2. The position of the hinge components 3 can be symmetrical about the center of the door body 2 or asymmetrical.

[0042] The hinge assembly 3 of the opening and closing device 100 of this utility model is provided with a hinge base 31, two connecting parts 32 and two elastic parts 33. The two connecting parts 32 are respectively inserted into two hinge bushings 311, and the two elastic parts 33 are connected to the hinge bushings 311 one by one. The structure of the two elastic parts 33 can provide a more uniform torque, so that the movement of the hinge assembly 3 is more stable during the opening and closing of the door 2, and the stress borne by each elastic part 33 is relatively small, thereby extending the service life of the elastic parts 33 and improving the stability and reliability of the opening and closing of the door 2.

[0043] In some embodiments of this utility model, the hinge base 31 includes a first mounting plate 312, one end of which is connected to two hinge bushings 311, and the other end of the first mounting plate 312 is connected to the housing 1. The connecting member 32 includes a rotating shaft 321, which is rotatably mounted inside the hinge bushings 311. An elastic member 33 is sleeved on the rotating shaft 321, and one end of the elastic member 33 is connected to the first mounting plate 312, and the other end of the elastic member 33 is connected to the rotating shaft 321.

[0044] Specifically, the two hinge bushings 311, two connectors 32, and two elastic elements 33 have the same structure and assembly structure. This embodiment will be described using one hinge bushing 311, one connector 32, and one elastic element 33. The hinge bushing 311 is used to accommodate and support the rotating shaft 321 of the connector 32. It is a cylindrical sleeve structure with an axially extending receiving cavity. The rotating shaft 321 extends into the receiving cavity and can rotate relative to the hinge bushing 311 within the receiving cavity. The elastic element 33 is sleeved on the rotating shaft 321, with one end connected to the first mounting plate 312 and the other end connected to the rotating shaft 321. The first mounting plate 312 is mounted on the outer peripheral wall of the hinge bushing 311 and extends in a direction perpendicular to the pivot axis P. The length of the first mounting plate 312 can be set to be relatively long to ensure that the hinge seat 31 can be stably fixed on the housing 1, providing support for the opening and closing of the door 2. The first mounting plate 312 is detachably mounted on the back of the housing 1. Optionally, the first mounting plate 312 may be provided with a first mounting hole 3121, which is used to cooperate with a fastener to fix the first mounting plate 312 to the housing 1. The number of first mounting holes 3121 can be one or multiple holes spaced apart. The fastener can be a bolt, screw, etc. In one specific implementation, the first mounting hole 3121 is a mounting hole, and the fastener is a bolt. The housing 1 may have a mounting part 12 recessed into the housing 1, and the first mounting plate 312 is installed in the mounting part 12, or the first mounting plate 312 can be directly installed on the back of the housing 1.

[0045] In some embodiments of this utility model, the connector 32 further includes a second mounting plate 322, which is connected to the rotating shaft 321 and extends along the axial direction of the rotating shaft 321. The second mounting plate 322 is mounted on the door body 2.

[0046] Specifically, the second mounting plate 322 is connected to the rotating shaft 321, serving to fix and support it. Since the second mounting plate 322 extends along the axis of the rotating shaft 321, it provides guidance during the movement of the rotating shaft 321, ensuring the accuracy of its movement trajectory. The second mounting plate 322 is detachably mounted on the door body 2. Optionally, the second mounting plate 322 may be provided with a second mounting hole 3221, which is used to cooperate with a fastener to fix the second mounting plate 322 to the door body 2. The number of second mounting holes 3221 can be one or multiple holes spaced apart. The fastener can be a bolt, screw, etc. In one specific implementation, the second mounting hole 3221 is a mounting hole, and the fastener is a bolt.

[0047] In some embodiments of this utility model, the thickness of the second mounting plate 322 is less than the diameter of the rotating shaft 321. By reducing the thickness of the second mounting plate 322, the overall installation space of the hinge assembly 3 can be saved while ensuring the strength of the rotating shaft 321.

[0048] In some embodiments of this utility model, the elastic element 33 is a torsion spring 331. The stiffness and size of the torsion spring 331 can be selected according to the load of the door body 2. The greater the load, the higher the stiffness of the torsion spring 331 is required to provide sufficient rebound force and stability.

[0049] In some embodiments of this utility model, each connecting member 32 has an assembly groove at one end inserted into the hinge bushing 311, and one end of the torsion spring 331 is mounted in the assembly groove 3211. The assembly groove 3211 extends radially along the rotating shaft 321 and is provided on the rotating shaft 321. The shape and size of the assembly groove are adapted to the shape and size of the torsion spring. The assembly groove is used for the installation of the torsion spring to ensure that the torsion spring can be stably connected to the rotating shaft. An assembly hole 3122 is provided on the first mounting plate 312 near one end of the hinge bushing 311. One end of the torsion spring 331 is embedded in the assembly groove 3211, and the other end is inserted into the assembly hole 3122, so that the elastic member 33 is connected to the rotating shaft 321 and the hinge seat 31. The torsion spring 331 is interference-fitted with the assembly groove 3211 and the assembly hole 3122 to ensure the tightness and reliability of the connection.

[0050] In some embodiments of this utility model, a mating structure 4 is provided between the hinge bushing 311 and the rotating shaft 321. The mating structure 4 is configured to restrict the relative axial movement of the rotating shaft 321 and the hinge bushing 311, and to limit the maximum angle of relative rotation between the rotating shaft 321 and the hinge bushing 311.

[0051] Specifically, the mating structure 4 includes a guide portion 42 and a mating portion 41. The guide portion 42 is disposed on one of the hinge bushing 311 and the rotating shaft 321, and the mating portion 41 is disposed on the other of the hinge bushing 311 and the rotating shaft 321. The guide portion 42 includes a guide groove 421 or a guide hole. The mating portion 41 is slidably connected to the guide portion 42. The mating portion 41 and the guide portion 42 cooperate to limit the maximum angle of relative rotation between the hinge bushing 311 and the rotating shaft 321. That is, when the mating portion 41 slides along the guide groove 421 or the guide hole, when the mating portion 41 abuts against the groove wall of the guide groove 421 or the hole wall of the guide hole, the rotation of the rotating shaft 321 is restricted, so that the door 2 reaches the maximum opening angle and cannot continue to move away from the box 1. In addition, the guide groove 421 or the guide hole can also guide and limit the rotation of the rotating shaft 321, so that the rotating shaft 321 can rotate smoothly along the predetermined direction during rotation, avoiding shaking or deviation.

[0052] In some embodiments of this utility model, the rotating shaft 321 is provided with a connecting hole 3212, and the mating part 41 includes a sliding member, which is inserted into the connecting hole and slidably connected to the guide groove 421 or the guide hole.

[0053] In one specific implementation, the rotating shaft 321 is provided with a connecting hole 3212, the sliding member includes a slider 411, the slider 411 is inserted into the connecting hole 3212, the hinge bushing 311 is provided with a circumferentially extending guide groove 421, and the slider 411 slides along the guide groove 421.

[0054] During assembly, first insert the rotating shaft 321 into the receiving cavity of the hinge bushing 311, aligning the position of the connecting hole 3212 with the position of the guide groove 421. Then, insert the slider 411 into the connecting hole 3212 and ensure an interference fit between the slider 411 and the connecting hole 3212 to ensure the tightness and reliability of the slider 411 connection. In addition, there should be an appropriate gap between the slider 411 and the guide groove 421 to ensure the flexibility of movement and prevent excessive wear.

[0055] When the rotating shaft 321 rotates, the slider 411 moves along the guide groove 421. When the slider 411 reaches the end of the guide groove 421, the movement of the rotating shaft 321 is stopped, thus limiting the maximum rotation angle of the rotating shaft 321. This effectively prevents the door 2 from opening or closing excessively, ensuring that the door 2 moves within a safe range and guaranteeing the smooth operation of the opening and closing device 100. The rotation angle of the rotating shaft 321 (the rotation angle of the door 2) ranges from -2.5° to 90°. That is, when the slider 411 is located at the first end of the guide groove 421, the angle between the rotating shaft 321 and the hinge sleeve 311 is -2.5°, and when the slider 411 is located at the second end of the guide groove 421 opposite to the first end, the angle between the rotating shaft 321 and the hinge sleeve 311 is 90°. The angles mentioned above can be -2.5°, -1°, 0°, 5°, 10°, 16°, 40°, 50°, 60°, 66°, 70°, 80°, 90°, etc.

[0056] The resistance torque generated by the friction between the hinge bushing 311 and the rotating shaft 321 acts as a damper during the opening and closing of the door 2, preventing the door 2 from closing or opening too quickly, while providing a certain degree of stability and safety. The load (weight and size) of the door 2 directly affects the magnitude of the friction torque; the greater the load, the greater the required friction torque, to prevent the door 2 from generating excessive inertial force during opening and closing. Assuming the weight of the door 2 is G, the width of the door 2 is L, the friction torque generated by the hinge bushing 311 is M1, the torque generated by the torsion spring 331 is M2, and the angle between the door 2 and the horizontal plane of the housing 1 is α, the torque balance equation (door 2 suspension equation) during movement is: G*L*cos(α)=M2±M1. The torsion spring 331 can be reasonably set according to the weight of the door 2, so that the torque generated by the hinge assembly 3 when opening the door can be greater than the torque generated by the weight of the door 2, allowing the door 2 to be suspended when open.

[0057] In some embodiments of this utility model, the outer wall of the door body 2 is provided with an installation cavity 21 that is recessed into the door body 2. The installation cavity 21 accommodates at least part of the hinge assembly 3. The hinge seat 31 is connected to the housing 1. Both connecting pieces 32 are connected to the door body 2. The pivot axis of the hinge assembly 3 is located inside the installation cavity 21.

[0058] Specifically, the housing 1 may have only one opening 11 or multiple openings 11. The openings 11 are usually located at the top of the housing 1. When multiple openings 11 are provided, multiple doors 2 may also be provided. At least some of the doors 2 may be pivotally connected to the housing 1 by hinge assemblies 3 to open or close the corresponding openings 11. The hinge assembly 3 may be completely or partially hidden within the mounting cavity 21, as long as the pivot axis P of the hinge assembly 3 is located within the mounting cavity 21. This minimizes the distance the hinge assembly 3 protrudes outward from the plane of the outer side wall, which is beneficial for placing the opening and closing device 100 against the wall.

[0059] The opening and closing device 100 of this utility model has an installation cavity 21 on the door body 2. The hinge assembly 3 includes a hinge seat 31, a connector 32, and an elastic element 33. The hinge seat 31 is connected to the housing 1. The connector 32 is installed in the installation cavity 21 and connected to the door body 2. The two ends of the elastic element 33 are connected to the hinge seat 31 and the connector 32, respectively. Since the pivot axis P of the hinge assembly 3 is located in the installation cavity 21, the rotation trajectory of the door body 2 is closer to the housing 1, reducing the range of the door body 2 protruding outward during opening. This reduces the distance of the door body 2 beyond the back of the housing 1, allowing it to be placed against the wall. At the same time, it reduces the possibility of the door body 2 scraping against the wall during opening, improving the user experience.

[0060] In some embodiments of this utility model, the door body 2 includes a first surface 22 disposed on the same side as the mounting cavity 21, and one side of the housing 1 has a reference surface 24 disposed on the same side as the first surface 22. When the door body 2 is closed on the opening 11, the reference surface 24 and the first surface 22 are flush with each other along a first direction X perpendicular to the reference surface 24. During the process of the door body 2 rotating relative to the housing 1 to the maximum opening angle, the maximum distance by which the door body 2 extends beyond the reference surface 24 along the first direction X is the over-cabin amount L. The over-cabin amount L satisfies the following condition: 0 <L≤20mm。

[0061] The door body 2 covers the opening 11 of the box body 1. At this time, the reference plane 24 and the first surface 22 are flush along the first direction X, which can not only improve the aesthetics of the opening and closing device 100, but also reduce the distance between the door body 2 and the wall surface. Since there is generally a skirting board at the junction of the wall surface and the ground in the interior decoration project, and the wall thickness of the skirting board is generally 10 mm, the reference plane 24 of the box body 1 is arranged to fit the skirting board. Considering the assembly error between the opening and closing device 100 and the ground, the gap between the first surface 22 of the door body 2 and the wall surface of the wall is ≥ 10 mm. During the process of the door body 2 rotating relative to the box body 1 to the maximum opening angle, the door body 2 will exceed the reference plane 24 by a certain distance along the first direction X. Define the maximum distance that the door body 2 exceeds the reference plane 24 along the first direction X as the over-box amount L, and limit the over-box amount L ≤ 20 mm, which can尽可能地减小门体2的第一表面22与墙体的墙面之间的间隙,同时降低门体2在打开过程中与墙面发生剐蹭的可能性。

[0062] In some embodiments of the present invention, the over-box amount L satisfies the following conditions: 0 < L ≤ 10 mm. At this time, the reference plane 24 of the box body 1 is completely arranged to fit the skirting board, the assembly error between the opening and closing device 100 and the ground is small, the maximum gap between the first surface 22 of the door body 2 and the wall surface of the wall is 10 mm, and during the process of the door body 2 rotating relative to the box body 1 to the maximum opening angle, the over-box amount L of the door body 2 does not exceed the maximum gap between the first surface 22 of the door body 2 and the wall surface of the wall, so that it can be placed against the wall, and the over-box amount is further reduced.

[0063] In some embodiments of the present invention, the distance between the pivot axis P and the first surface 22 is L1, the vertical plane perpendicular to the pivot axis P is the reference plane, the positive projection of the pivot axis P reference plane in the reference plane is the point O, the side of the door body 2背离箱体1的一侧为第二表面23,第二表面23与第一表面22的相交线在参考面内的正投影为A点,O点至A点之间的距离为L2,超箱量L=L2-L1。

[0064] Specifically, the distance between the pivot axis P and the second surface 23 is L3. When the connection between the first surface 22 and the second surface 23 is a right angle, that is, the plane where the first surface 22 is located and the plane where the second surface 23 is located are perpendicular to each other. At this time, L2 2 =L1 2 +L3 2 It should be noted that there is an unclear expression "尽可能地减小门体2的第一表面22与墙体的墙面之间的间隙,同时降低门体2在打开过程中与墙面发生剐蹭的可能性。" in the original text which may need to be further refined for a more accurate translation. The above translation is based on the existing text as much as possible.L2 can be calculated using the above formula, and then the overfill amount L can be calculated using the formula L = L2 - L1. When the connection between the first surface 22 and the second surface 23 is a rounded corner, that is, the plane containing the first surface 22 and the plane containing the second surface 23 are connected by an arc structure transition, the radius of the rounded corner is r, and the distance from point O to the center of the rounded corner is R1. In this case, L2 = R1 + r, and L2 can be calculated using the above formula, and then the overfill amount L can be calculated using the formula L = L2 - L1. When the connection between the first surface 22 and the second surface 23 is an angled angle, that is, the first surface 22 and the second surface 23 are connected by an inclined plane, and the length of the inclined plane is c, then L2... 2 =(L1-C) 2 +L3 2 L2 can be calculated using the above formula, and then the oversized container L can be calculated using the formula L = L2 - L1.

[0065] During the rotation of door 2 relative to box 1, point A will rotate around point O with the length between OA as the radius. Figure 3 The dotted arc in the middle moves, when door 2 rotates to Figure 3 When the position indicated by the dashed line is reached, point A reaches point A' and point B reaches point B'. At this time, the over-cabinet amount L is the distance between point A' and the reference surface 24 of the box body 1. It can be seen that as the rotation angle of the door body 2 increases, the over-cabinet amount L gradually increases. When the line connecting point O and point A is a horizontal line, that is, when the intersection line of the second surface 23 and the first surface 22 is on the same horizontal plane as the pivot axis P of the hinge assembly 3, the over-cabinet amount L is at its maximum, and then the over-cabinet amount L gradually decreases.

[0066] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An opening and closing device, characterized in that, include: The box has an opening; The door body is pivotally connected to the opening via a hinge assembly; The hinge assembly includes a hinge base, two connectors, and two elastic elements. One end of the hinge base has two hinge bushings spaced apart along the axial direction of the hinge assembly, and the other end is connected to the housing. One end of each of the two connectors is inserted into one of the two hinge bushings and rotatably connected to the hinge bushing. The other end of each connector, away from the hinge base, is connected to the door body. The two elastic elements are installed one at a time on the two connectors inserted into the hinge bushings and connected to the two hinge bushings. The elastic elements are used to apply an auxiliary force to the door body to rotate in the opening direction.

2. The opening and closing device according to claim 1, characterized in that, The hinge base includes a first mounting plate, one end of which is connected to the two hinge bushings, and the other end of which is connected to the housing. The connecting member includes a rotating shaft, which is rotatably mounted inside the hinge bushings. An elastic element is sleeved on the rotating shaft, and one end of the elastic element is connected to the first mounting plate, and the other end of the elastic element is connected to the rotating shaft.

3. The opening and closing device according to claim 2, characterized in that, The elastic element is a torsion spring.

4. The opening and closing device according to claim 3, characterized in that, Each of the connecting members has an assembly groove at one end inserted into the hinge bushing, and one end of the torsion spring is installed in the assembly groove.

5. The opening and closing device according to claim 2, characterized in that, The connector further includes a second mounting plate, which is connected to the rotating shaft and extends along the axial direction of the rotating shaft. The second mounting plate is mounted on the door body.

6. The opening and closing device according to claim 5, characterized in that, The thickness of the second mounting plate is less than the diameter of the rotating shaft.

7. The opening and closing device according to claim 2, characterized in that, A mating structure is provided between the hinge bushing and the rotating shaft. The mating structure is configured to restrict the relative axial movement of the rotating shaft and the hinge bushing, and to limit the maximum angle of relative rotation between the rotating shaft and the hinge bushing.

8. The opening and closing device according to claim 7, characterized in that, The mating structure includes a guide portion and a mating portion. The guide portion is disposed on one of the hinge bushing and the rotating shaft, and the mating portion is disposed on the other of the hinge bushing and the rotating shaft. The guide portion includes a guide groove or a guide hole, and the mating portion is slidably connected to the guide portion.

9. The opening and closing device according to claim 8, characterized in that, The rotating shaft is provided with a connecting hole, and the mating part includes a sliding member. The sliding member is inserted into the connecting hole and slidably connected to the guide groove or the guide hole.

10. The opening and closing device according to any one of claims 1-9, characterized in that, The outer wall of the door body is provided with a mounting cavity that is recessed into the door body. The mounting cavity accommodates at least part of the hinge assembly. The hinge seat is connected to the housing. Both of the connecting members are connected to the door body. The pivot axis of the hinge assembly is located within the mounting cavity.

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