A lid opening and closing structure and a container

Abstract

The utility model relates to buffer structure technical field discloses a kind of opening and closing lid structure and container. Opening and closing lid structure includes: lid body, elastic member and buffer assembly installed in lid body and / or shell;Buffer assembly includes at least two buffer blocks;Part of buffer block of buffer assembly is installed to form forward buffer block, another part of buffer block is installed to form reverse buffer block in reverse inversion, so that the resultant moment change of lid body is gentle in the process of opening, and the opening speed is more stable, avoid the situation that container jumps when automatic opening, improve use experience.

Description

Technical Field

[0001] This utility model relates to the field of buffer structure technology, specifically to an opening and closing cover structure and container. Background Technology

[0002] The flip-top mechanism of a container typically uses a pre-tension spring at the pivot point. Pressing the open button causes the lid to open automatically due to the spring's rebound. If the spring torque is less than the lid's gravitational torque, the lid may not open fully. If the spring torque is greater than the lid's gravitational torque, the entire container may tip over or even fall over. For example, the "cooking off" phenomenon in rice cookers is caused by the hinge spring torque exceeding the lid's gravitational torque. The commonly used solution is to first increase the spring torque to ensure the lid opens fully, and then use a damper or buffer to address the issue of the spring torque exceeding the lid's gravitational torque.

[0003] Adding a damper requires adding a velocity term and solving a second-order differential equation to obtain an accurate damping value when calculating the motion state. The whole process is cumbersome, and it is not always possible to find a damper whose damping value matches the required result obtained from the calculation. It needs to be customized, which is too costly.

[0004] The buffer block consists of several elastic elements added between the lid and the shell. When the lid moves to a certain position during opening, it compresses the buffer block, thus receiving a spring torque in the opposite direction to the spring torque, thereby reducing the impact. However, the relationship between the elastic torque and the angle of motion is linear, while the relationship between the gravitational torque and the angle of motion is a cosine function, which is a non-linear relationship. Therefore, no matter how the parameters are adjusted, the resultant torque on the lid during its movement cannot maintain a relatively slow changing trend, meaning that the lid cannot be opened at a relatively smooth speed, and the container will still be subjected to a large impact, affecting the user experience. Utility Model Content

[0005] In view of this, the present invention provides an opening and closing lid structure and container to solve the problem that even with the addition of a buffer block, the resultant torque on the lid during the opening process cannot maintain a slow changing trend, and the lid cannot be opened at a relatively stable speed, and the container will still be subjected to a large impact, affecting the user experience.

[0006] In a first aspect, this utility model provides an opening and closing lid structure, suitable for installation on the shell of a container, comprising:

[0007] A cover having a hinge axis; the cover is adapted to be hinged to the housing via the hinge axis;

[0008] An elastic element, disposed on the hinge shaft, provides an opening driving force to the cover body;

[0009] A buffer assembly, installed on the cover and / or the housing, is capable of frictional contact with the housing during the opening of the cover, providing a buffering force opposite to the elastic force of the elastic element;

[0010] The buffer assembly includes at least two buffer blocks; some of the buffer blocks are installed facing forward to form a forward buffer block, and the other part of the buffer blocks are installed in reverse to form a reverse buffer block.

[0011] Beneficial effects: Some buffer blocks of the buffer assembly are installed facing forward to form a forward buffer block, while other buffer blocks are installed in reverse to form a reverse buffer block. Under the synergistic effect of the forward and reverse buffer blocks, the buffer assembly generates a larger buffer torque in the early and late stages of the opening stroke, and a smaller buffer torque in the middle stage of the opening stroke. This makes the change of the resultant torque tend to be gradual throughout the opening process, and the opening speed tends to be uniform, thereby reducing the impact on the shell and improving the user experience.

[0012] In one optional embodiment, the buffer block has a strong buffer section and a weak buffer section, and during the opening process, the strong buffer section and the weak buffer section make frictional contact with the shell in a preset order.

[0013] Beneficial effects: The strong buffer section is the area where the buffer block exerts a greater buffering force on the mating surface of the shell after being squeezed by the shell, while the weak buffer section is the area where the buffer block exerts a smaller buffering force on the mating surface of the shell after being squeezed by the shell. By setting strong and weak buffer sections, the strong buffer section of the forward buffer block and the weak buffer section of the reverse buffer block are in frictional contact with the shell, and vice versa. This effectively controls the magnitude of the buffering torque, achieving the goal of keeping the resultant torque constant or allowing it to change gradually throughout the entire opening process.

[0014] In one optional implementation, the strong buffer section of the positive buffer block is located on the lower side and the weak buffer section is located on the upper side; the strong buffer section of the reverse buffer block is located on the upper side and the weak buffer section is located on the lower side.

[0015] Beneficial effects: During the opening process, the strong and weak buffer sections of the forward and reverse buffer blocks respectively rub against the shell in a preset order. As the opening process progresses, in the early stage of opening, when the strong buffer section of the forward buffer block contacts the shell first, the weak buffer section of the reverse buffer block contacts the shell first. In the later stage of opening, when the weak buffer section of the forward buffer block contacts the shell, the strong buffer section of the reverse buffer block contacts the shell. With this setting, the combined torque of the buffer block's buffering torque, the elastic torque of the elastic element, and the gravitational torque of the cover can always maintain a sufficiently slow change trend at different stages of opening. Especially in the early and late stages of the opening stroke, the cooperation of the strong and weak buffer sections provides appropriate frictional buffering force, ensuring that the opening speed can remain stable throughout the entire opening stroke, preventing the shell from being subjected to a large impact and jumping off the placement surface.

[0016] In one optional implementation, the buffer block includes:

[0017] Buffer body;

[0018] A buffer mating part is located on the compression side of the buffer body, and at least the buffer mating part of the buffer body is made of an elastic material.

[0019] Beneficial effects: At least the buffer mating part of the buffer body is made of elastic material. The elastic deformation of the buffer mating part after being squeezed by the shell provides frictional resistance when the cover rotates. The structure is simple and the buffer reliability is high.

[0020] In one optional embodiment, the buffer mating part includes:

[0021] The first arc surface, with the hinge axis as the axis of rotation;

[0022] The plane connects with the first arc surface.

[0023] Beneficial effects: When the first arc surface rotates around the hinge axis and engages with the corresponding third arc surface on the housing, the deformation of the buffer block is stable and relatively small. However, when the plane connecting with the first arc surface engages with the third arc surface through frictional rotation, the deformation is larger. With this configuration, when the buffer block is installed in the forward or inverted position, if one of its planes contacts the third arc surface, the other one of its first arc surfaces will also contact the third arc surface. Conversely, if one of its planes contacts the third arc surface, one of its first arc surfaces will also contact the third arc surface.

[0024] In one alternative embodiment, the first angle between the tangent of the first arc surface at the connection point and the plane is an obtuse angle.

[0025] Beneficial effects: The first angle between the tangent of the first arc surface at the connection point and the plane is an obtuse angle. Through structural changes and boundaries, the strong buffer section and the weak buffer section are effectively distinguished, so that the strong buffer section and the weak buffer section of the forward buffer block and the reverse buffer block cooperate in the early and late stages of the opening stroke, so as to achieve the purpose of smooth opening speed.

[0026] In one alternative embodiment, the buffer block has a strong buffer section and a weak buffer section, with the first arc surface located in the strong buffer section and the plane located in the weak buffer section.

[0027] Beneficial effects: When the first arc surface rotates around the hinge axis and mates with the corresponding third arc surface on the shell, the deformation of the first arc surface is stable and relatively large, resulting in a larger buffer force; while when the plane mates with the third arc surface and rotates, the deformation is smaller and the buffer force is smaller.

[0028] In one optional embodiment, the buffer block has a strong buffer section and a weak buffer section; the buffer mating part includes:

[0029] The second arc surface is rotated about the hinge axis, and both the strong buffer section and the weak buffer section are formed on the second arc surface.

[0030] Beneficial effects: Both the strong and weak buffer sections are formed on the second arc surface, resulting in a smoother transition and simpler processing technology.

[0031] In one optional embodiment, the friction stroke length between the strong buffer section and the housing is greater than the friction stroke length between the weak buffer section and the housing.

[0032] Beneficial effects: The friction stroke length between the strong buffer section and the shell is greater than that between the weak buffer section and the shell, which facilitates the provision of a larger deformation friction force. Throughout the entire opening stroke, the buffer force can be matched with the elastic force of the elastic element and the weight of the cover, so as to maintain a smooth opening throughout the entire stroke.

[0033] In one alternative embodiment, the cover includes:

[0034] A first card slot, wherein at least one of the reverse buffer blocks is disposed in the first card slot;

[0035] The second card slot is spaced apart from the first card slot; at least one of the positive buffer blocks is disposed in the second card slot.

[0036] Beneficial effects: The reverse buffer block and the forward buffer block are respectively set in the first and second slots on the cover, which improves the installation reliability of the buffer block; moreover, the installation space on the cover is larger than the installation space on the shell, which effectively utilizes the space on the cover and facilitates the arrangement and installation of the buffer block.

[0037] In one optional embodiment, the first slot is provided with at least one first mounting position, and the reverse buffer block is detachably mounted in the first mounting position;

[0038] And / or, the second slot is provided with at least one second mounting position, in which the positive buffer block is detachably mounted.

[0039] Beneficial effect: The mounting positions for accommodating buffer blocks are arranged in the first and / or second slots. The number of first mounting positions in the first slot and the number of second mounting positions in the second slot can be determined according to the number of reverse and forward buffer blocks, so that each buffer block is set in one mounting position.

[0040] In one optional embodiment, both the first slot and the second slot are disposed on the cover near the hinge axis; and at least two of the second slots are distributed on both sides of the first slot along the axial direction of the hinge axis.

[0041] Beneficial effects: The slot is located near the hinge axis, so the buffer block is closer to the housing after installation, which makes it easier for the buffer block to contact the housing during the flipping of the cover and provide cushioning force.

[0042] In one optional implementation, the buffer block further includes:

[0043] The force-reducing hole is located near the strong buffer section.

[0044] Beneficial effect: The force-reducing holes are set near the strong buffer section to prevent the buffer block from being too thick and hard, thus avoiding excessive elastic force that would affect normal opening of the lid.

[0045] Secondly, this utility model also provides a container, comprising:

[0046] case;

[0047] In any of the above-described opening and closing cover structures, the cover body is hinged to the housing.

[0048] Beneficial effects: Due to the opening and closing structure of this utility model, the buffer component generates a large buffer torque in the early and late stages of the opening stroke, and a small buffer torque in the middle stage of the opening stroke, under the synergistic effect of the forward buffer block and the reverse buffer block. This makes the resultant torque after adding the buffer component change more gradually throughout the opening process, and the opening speed tends to be uniform, thereby reducing the impact on the shell and providing a better user experience.

[0049] In one optional embodiment, a third arc surface is formed at the mating point between the housing and the buffer block, with the hinge axis as the center of the third arc surface.

[0050] Beneficial effect: A third arc surface with the hinge axis as the center is provided on the shell to guide the buffer block when it flips with the cover, making the movement of the cover smoother.

[0051] In one alternative implementation, the container is a cooking utensil.

[0052] Beneficial effects: With the synergistic effect of the forward and reverse buffer blocks, the buffer assembly generates a larger buffer torque in the early and late stages of the lid opening stroke, and a smaller buffer torque in the middle stage of the lid opening stroke. This makes the resultant torque after adding the buffer assembly change more gradually throughout the lid opening process, and the lid opening speed tends to be uniform. This reduces the impact on the shell, prevents the pot from jumping out of the pot, improves the reliability of the cooking appliance, and provides a better user experience. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a perspective view of an opening and closing cover structure according to an embodiment of the present utility model;

[0055] Figure 2 for Figure 1 A magnified view of a portion of section A;

[0056] Figure 3 This is a three-dimensional structural diagram of a positive buffer block according to an embodiment of the present utility model;

[0057] Figure 4 This is a three-dimensional structural diagram of a reverse buffer block according to an embodiment of the present utility model;

[0058] Figure 5This is a first cross-sectional view of an opening and closing cover structure according to an embodiment of the present utility model. The view shows the connection relationship between the positive buffer block and the cover body when the cover is closed.

[0059] Figure 6 This is a second cross-sectional view of an opening and closing cover structure according to an embodiment of the present utility model. The view shows the connection relationship between the reverse buffer block and the cover body when the cover is closed.

[0060] Figure 7 for Figure 6 A magnified schematic diagram of part C in the middle section;

[0061] Figure 8 This is a schematic diagram of the reverse buffer block and the shell in a buffering engagement state during the opening and closing process of the opening and closing cover structure of this utility model;

[0062] Figure 9 This is a three-dimensional structural diagram of a first card slot according to an embodiment of the present utility model;

[0063] Figure 10 A three-dimensional structural diagram of the second buffer block of this utility model is provided;

[0064] Figure 11 This is a schematic diagram of the assembly state of a buffer component according to another embodiment of the present invention. The structures of the two types of buffer blocks in the figure are different.

[0065] Figure 12 for Figure 11 A magnified view of a portion of section B;

[0066] Figure 13 The curves showing the relationship between the elastic element's spring torque, the lid's gravitational torque, and the resultant torque as a function of the lid opening angle when no buffer block is provided in the relevant technology;

[0067] Figure 14 A schematic diagram is provided showing the state when the curves of the resultant torque M1 and the curves of the resultant torque M0 form a symmetrical curve.

[0068] Figures 15-17 The diagram shows the friction state between the forward and reverse buffer blocks of this invention and the shell at different stages of the opening stroke.

[0069] Explanation of reference numerals in the attached figures:

[0070] 1. Cover;

[0071] 11. First slot; 111. First engagement hole; 112. Guide surface; 1121. Smooth section; 113. Rib;

[0072] 2. Shell;

[0073] 3. Hinge shaft;

[0074] 4. Elastic components;

[0075] 5. Spring mounting position;

[0076] 6. Buffer components;

[0077] 61. Reverse buffer block; 62. Forward buffer block; 63. Second buffer block;

[0078] 601, Strong buffer section; 6011, Compressed surface; 602, Weak buffer section; 603, Mounting part; 6031, Conical surface; 604, Neck; 605, Force reduction hole. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0080] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0081] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0082] The following is combined with Figures 1 to 17 The following describes embodiments of the present invention.

[0083] According to embodiments of the present invention, on the one hand, such as Figure 1 and Figure 2As shown, an opening and closing lid structure is provided, suitable for mounting on the shell 2 of a container, comprising:

[0084] The cover 1 has a hinge shaft 3; the cover 1 is adapted to be hinged to the housing 2 by means of the hinge shaft 3.

[0085] The elastic element 4 is located on the hinge shaft 3 and provides the opening driving force to the cover body 1;

[0086] The buffer assembly 6 is installed on the cover 1 and can make frictional contact with the shell 2 during the opening of the cover 1, providing a buffering force opposite to the elastic force of the elastic element 4.

[0087] The buffer assembly 6 includes at least two buffer blocks; some of the buffer blocks of the buffer assembly 6 are installed facing forward to form a forward buffer block 62, and the other part of the buffer blocks are installed in reverse to form a reverse buffer block 61.

[0088] The buffer assembly 6 has some buffer blocks installed in the forward direction to form a forward buffer block 62, and another part of the buffer blocks installed in the reverse direction to form a reverse buffer block 61. Under the synergistic effect of the forward buffer block 62 and the reverse buffer block 61, the buffer assembly 6 generates a larger buffer torque in the early and late stages of the opening stroke, and a smaller buffer torque in the middle stage of the opening stroke. This makes the change of the resultant torque tend to be gradual throughout the opening process, and the opening speed tends to be uniform, thereby reducing the impact on the shell 2 and providing a better user experience.

[0089] The resultant torque of the buffer assembly 6, the gravitational torque of the cover 1, and the elastic torque of the elastic element 4 remains constant or nearly constant during the opening stroke. Let M1 be the resultant torque of the buffer forces generated by at least two buffer blocks, and M0 be the resultant torque of the gravitational torque of the cover 1 and the elastic torque of the elastic element 4. During the opening stroke, the curve of the resultant torque M1 versus the opening angle forms a symmetrical curve to the curve of the resultant torque M0 versus the opening angle (see [reference]). Figure 14 (or approximately symmetrical curves.)

[0090] The combined torque of the buffer component 6, the gravitational torque of the lid 1, and the elastic torque of the elastic element 4 remains constant or close during the opening stroke. This design ensures that during the opening process, especially in the early and late stages of the opening stroke, at least two buffer blocks can balance the large changes in the combined torque, making the change in the combined torque on the lid 1 smoother. The combined torque approaches a linear trend throughout the entire opening stroke. By balancing the nonlinear changes in the gravitational torque through the buffer component 6, the opening speed is more stable, preventing the container from jumping during automatic opening and improving the user experience.

[0091] It should be noted that the resultant torque being close during the opening stroke means that, due to manufacturing errors and installation errors, after the buffer block is assembled, the resultant torque of the buffer component 6, the gravitational torque of the cover 1, and the elastic torque of the elastic element 4 is allowed to fluctuate within a very small range throughout the entire opening stroke. The change in resultant torque is gradual, and the resultant torque tends to be a smooth straight line parallel to the coordinate axis as the opening angle changes.

[0092] It should be noted that the frictional contact between the buffer assembly 6 and the housing 2 can be caused by the compressive rebound force generated by the elastic deformation of the buffer block itself when the buffer block and the housing 2 are pressed against each other. Of course, it can also be caused by setting a friction structure on the surface of the buffer block. There is no specific limitation here, as long as it can provide buffer damping in the opposite direction to the rebound force of the elastic element 4.

[0093] Figures 15-17 A schematic diagram of the connection state between the forward buffer block and the reverse buffer block and the housing 2 at different stages of the opening stroke is given (the diagram shows the state of the buffer block before deformation).

[0094] In some other embodiments, the buffer assembly 6 can also be mounted on the housing 2 and can make frictional contact with the cover 1 during the opening process. After being compressed and deformed, at least two buffer blocks of the buffer assembly 6 can provide a buffering force in the opposite direction to the elastic force of the cover 1 and the elastic element 4. Of course, in practical applications, some of the buffer blocks of the at least two buffer blocks can be mounted on the upper cover 1, and the other part of the buffer blocks can be mounted on the housing 2. In specific applications, the installation position of the buffer blocks can be determined by comprehensively considering factors such as installation space and product structure.

[0095] In some embodiments, at least two buffer blocks include a first buffer block and a second buffer block 63; the forces acting on the cover 1 during the opening process satisfy the following relationship:

[0096]

[0097] In the formula, n2 is the number of the first buffer blocks, K2 is the elastic coefficient of the buffer blocks, and in this embodiment, the buffer blocks are made of the same material. α α represents the compression deformation of the first buffer block at different opening angles, and α represents the opening angle of the cover 1. max n1 represents the maximum opening angle of the cover 1, and n1 represents the number of the second buffer blocks 63. K1 is the compression deformation of the second buffer block 63 at different opening angles, G is the elastic coefficient of the elastic element 4, L is the gravity of the cover 1, and L is the distance from the center of gravity of the cover 1 to the hinge axis 3.

[0098] The forces acting on lid 1 during the opening process satisfy the following relationship: This indicates that during the entire opening process with the opening angle α as the variable, the resultant torque of the buffer component 6, the elastic torque of the elastic element 4, and the gravitational torque of the cover 1 is 0. That is, under the synergistic action of the positive buffer block 62 and the reverse buffer block 61, the buffer component 6 generates a larger buffer torque in the early and late stages of the opening stroke, and a smaller buffer torque in the middle stage of the opening stroke. This makes the resultant torque after adding the buffer component 6 change more gradually throughout the entire opening process, and the opening speed tends to be uniform, thereby reducing the impact on the shell 2.

[0099] In the following embodiments, at least two buffer blocks are identical as an example. However, in some other embodiments, the at least two buffer blocks may not be identical, including cases where the structures, sizes, or materials are different, as long as the variation curve of the resultant torque M1 of the buffer assembly 6 constitutes a non-linear symmetrical curve of the variation curve of the resultant torque M0 of the gravitational torque of the cover 1 and the elastic torque of the elastic element 4.

[0100] In some embodiments, such as Figure 3 , Figure 4 , Figure 7 , Figure 8 and Figure 10 As shown, the buffer block has a strong buffer section 601 and a weak buffer section 602. During the opening process, the strong buffer section 601 and the weak buffer section 602 rub against the shell 2 in a preset order. Some of the buffer blocks of the buffer assembly 6 are installed in the forward direction to form a forward buffer block 62, and the other part of the buffer blocks are installed in the reverse direction to form a reverse buffer block 61.

[0101] The strong buffer section 601 is the section with a large buffering force acting on the mating surface of the shell 2 after being squeezed by the shell 2, while the weak buffer section 602 is the section with a small buffering force acting on the mating surface of the shell 2 after being squeezed by the shell 2.

[0102] The buffer assembly 6 consists of two parts: a forward buffer block 62 and a reverse buffer block 61. During the opening process, the strong buffer section 601 and the weak buffer section 602 of both the forward and reverse buffer blocks 62 and 61 respectively come into contact with the housing 2 in a predetermined sequence. As the opening process progresses, when the strong buffer section 601 of the forward buffer block 62 contacts the housing 2, the weak buffer section 602 of the reverse buffer block 61 also contacts the housing 2. Conversely, when the weak buffer section 602 of the forward buffer block 62 contacts the housing 2, the strong buffer section 602 of the reverse buffer block 61 also contacts the housing 2. The punch section 601 contacts the shell 2. With this configuration, the combined torque of the buffer block, the elastic torque of the elastic element 4, and the gravitational torque of the lid 1 can always maintain a sufficiently slow change trend at different stages of opening the lid. Especially in the early and late stages of the opening stroke, the cooperation of the strong buffer section 601 and the weak buffer section 602 provides appropriate frictional buffering force, ensuring that the opening speed can remain stable throughout the entire opening stroke, preventing the shell 2 from being subjected to large impacts. Applying this structure to cooking appliances such as rice cookers can prevent the rice cooker from jumping out of the pot and improve the user experience.

[0103] Specifically, all buffer blocks in buffer assembly 6 use the same type of buffer block; that is, the forward buffer block 62 and the reverse buffer block 61 have the same structure, shape, and size, only their installation directions are opposite. Figure 3 and Figure 4 When installed in the forward direction, a forward buffer block 62 is formed; when installed in the reverse direction, a reverse buffer block is formed. In another embodiment, Figure 10 The buffer blocks shown can also be installed upright or upside down to form upright buffer block 62 and upside-down buffer block 61. This only requires one set of molds, saving costs. When in use, some buffer blocks are installed upright and some are installed upside down, which allows the strong buffer section 601 to be matched with the weak buffer section 602 to balance the nonlinear change of the gravitational torque, so that the resultant torque on the cover 1 can maintain a slower trend of change, making the opening of the cover smoother and more reliable. Figure 8 The compressive fit between the reverse buffer block 61 and the shell 2 during the opening process is given.

[0104] In some embodiments, such as Figure 3 and Figure 4 As shown, the buffer block includes:

[0105] Buffer body;

[0106] A buffer mating part is located on the compression side of the buffer body, and at least the buffer mating part of the buffer body is made of an elastic material; a strong buffer section 601 and a weak buffer section 602 are formed in the buffer mating part;

[0107] The mounting part 603 is located on the non-extrusion side of the buffer body away from the buffer mating part.

[0108] At least the buffer mating part of the buffer body is made of elastic material. The elastic deformation of the buffer mating part after being squeezed by the shell 2 provides frictional resistance when the cover 1 rotates. The structure is simple and the buffer reliability is high.

[0109] It should be noted that in the following embodiments, for ease of molding and processing, the buffer body, buffer mating part and mounting part 603 of the buffer block are integrally molded, and the buffer block is made of elastic material.

[0110] In some embodiments, the strong buffer segment 601 is connected to the weak buffer segment 602, and the surface where the strong buffer segment 601 is located forms an angle with the surface where the weak buffer segment 602 is located.

[0111] The strong buffer section 601 and the weak buffer section 602 are connected and their surfaces are at an angle to each other. This adapts to different stages of the opening stroke and ensures that the opening speed remains stable throughout the entire opening stroke, preventing the shell 2 from being subjected to large impacts.

[0112] The length of the strong buffer section 601 is greater than the length of the weak buffer section 602, ensuring that the change in the resultant torque on the cover 1 is smoother throughout the entire opening process.

[0113] In some embodiments, the strong buffer section 601 includes a first arc surface, and the weak buffer section 602 includes a plane, wherein the first arc surface is connected to the plane.

[0114] Provided that the resultant torque requirement is met, the arc surface of the strong buffer section 601 is easy to design and manufacture, and the flat surface of the weak buffer section 602 is easy to process.

[0115] In some embodiments, such as Figure 4 As shown, the first angle γ formed by the tangent of the first arc surface at the connection point and the plane is an obtuse angle.

[0116] In some embodiments, the radius R0 of the first arc surface satisfies 18mm≤R0≤19mm, which can provide a suitable buffer torque when subjected to compression deformation.

[0117] In some embodiments, the radius R1 of the second arc surface satisfies 21mm≤R1≤22mm.

[0118] The radius of the second arc surface satisfies 21mm≤R1≤22mm, and the second buffer block 63 can provide a suitable buffer torque when subjected to compression deformation.

[0119] The thickness value h1 of the second buffer block 63 corresponding to the strong buffer section 601 is (4.6±0.3) mm, and the thickness value h2 of the second buffer block 63 corresponding to the weak buffer section 602 is (3.5±0.3) mm.

[0120] The thicker end of the second arc surface of the second buffer block 63 provides greater compressive rebound force, which is the strong buffer section 601; while the thinner end of the second arc surface provides less compressive rebound force, which is the weak buffer section 602.

[0121] It should be noted that both the first and second arc surfaces are set with the hinge point of the cover 1 as the center.

[0122] In some embodiments, the buffer block further includes a neck 604, through which the mounting portion 603 is connected to the buffer body.

[0123] The neck 604 is designed to facilitate the installation of the buffer block in the mating structure of the inner cover via the mounting part 603, thereby achieving a limiting fit and increasing the ease of installation.

[0124] In some embodiments, such as Figure 7 As shown, the angle between the plane of the weak buffer section 602 and the parallel plane of the cross-section of the neck 604 is β, and the angle β satisfies 30°≤β≤40°.

[0125] If the angle β between the parallel planes of the weak buffer section 602 and the neck 604 is less than 30°, the elastic force of the weak buffer section 602 under compression is small, failing to achieve its purpose of being used in conjunction with the strong buffer section 601. If the angle β is greater than 40°, the elastic force of the weak buffer section 602 under compression is large, and the combined effect of this with the elastic force of the strong buffer section 601 under compression results in an excessively large buffer torque, making it impossible to achieve a smooth change in the resultant torque during the early and late stages of the opening stroke. When the angle β satisfies 30°≤β≤40°, the change in the resultant torque is very smooth during the early and late stages of the opening stroke, and the opening speed tends to be constant throughout the entire opening stroke.

[0126] In some embodiments, in the first direction in which the strong buffer section 601 and the weak buffer section 602 are arranged, the mounting part 603 is eccentrically disposed on the non-compression side.

[0127] In the first direction where the strong buffer section 601 and the weak buffer section 602 are arranged, the mounting part 603 is eccentrically positioned on the non-compression side, so that the height of the mounting part 603 is different when installed in the forward and reverse directions. The center heights of the first engaging hole 111 corresponding to the reverse buffer block 61 and the second engaging hole corresponding to the forward buffer block 62 on the cover 1 are also different, which plays a role in preventing mistake-proofing and ensuring the correct installation of the forward buffer block 62 and the reverse buffer block 61, avoiding the situation where the forward buffer block 62 and the reverse buffer block 61 are installed in the wrong direction or in the wrong position.

[0128] In some embodiments, the mounting portion 603 includes a frustoconical resilient snap.

[0129] The elastic buckle is easy to install and disassemble. The snap-fit ​​method is convenient to operate, and also easy to maintain and replace the buffer block as needed. The elastic buckle is truncated cone-shaped, and the cone surface 6031 is used as the installation guide surface to improve the ease of installation. Moreover, the bottom surface of the truncated cone is used as the limiting surface, which makes the structure simple.

[0130] Specifically, the elastic buckle is shaped like a frustum of a cone with small edges, making it easier to install.

[0131] In some embodiments, such as Figure 7 As shown, the angle θ between the cone surface 6031 of the frustum-shaped elastic buckle and its upper bottom surface satisfies 30°≤θ≤60°.

[0132] If the angle θ between the conical surface 6031 and its upper bottom surface is too small, the buffer block will be difficult to install. If the angle θ is too large, the axial dimension of the buffer block will be too large. The angle θ satisfies 30°≤θ≤60°, which improves the ease of installation and makes it convenient to install the buffer block into the limited space on the cover 1, thus avoiding increasing the product volume.

[0133] In some embodiments, the cover 1 includes:

[0134] First slot 11, at least one reverse buffer block 61 is disposed in first slot 11;

[0135] The second card slot is spaced apart from the first card slot 11; at least one positive buffer block 62 is disposed in the second card slot.

[0136] The reverse buffer block 61 and the forward buffer block 62 are respectively set in the first slot 11 and the second slot on the cover 1 to improve the installation reliability of the buffer block.

[0137] In some embodiments, the first slot 11 is provided with at least one first mounting position, and the reverse buffer block 61 is detachably mounted in the first mounting position;

[0138] The second slot is provided with at least one second mounting position, and the positive buffer block 62 is detachably installed in the second mounting position.

[0139] Mounting positions for accommodating buffer blocks are arranged in the first slot 11 and / or the second slot. The number of first mounting positions in the first slot 11 and the number of second mounting positions in the second slot can be determined according to the number of reverse buffer blocks 61 and forward buffer blocks 62, so that each buffer block is set in one mounting position.

[0140] In some embodiments, the first mounting position includes:

[0141] First snap-fit ​​receiving cavity;

[0142] The mounting part 603 of the reverse buffer block 61 passes through the first engagement hole 111 and is disposed in the first buckle receiving cavity;

[0143] The second mounting position includes:

[0144] Second snap-fit ​​receiving cavity;

[0145] The second engaging hole allows the mounting portion 603 of the positive buffer block 62 to pass through and be positioned in the second snap-fit ​​cavity.

[0146] In some embodiments, the first mounting position includes:

[0147] First snap-fit ​​receiving cavity;

[0148] The mounting portion 603 of the reverse buffer block 61 passes through the first engagement hole 111 and is disposed in the first buckle receiving cavity.

[0149] In some embodiments, the second mounting position includes:

[0150] Second snap-fit ​​receiving cavity;

[0151] The second engaging hole allows the mounting portion 603 of the positive buffer block 62 to pass through and be positioned in the second snap-fit ​​cavity.

[0152] In the three embodiments above, the mounting position includes a snap-fit ​​cavity and a snap-fit ​​hole, which facilitates the mounting part 603 to pass through the snap-fit ​​hole and be placed into the snap-fit ​​cavity to achieve reliable fixation.

[0153] In some embodiments, the structures of the first snap-fit ​​cavity and the second snap-fit ​​cavity are both matched with the structure of the mounting portion 603, and a first fitting gap is formed in the first snap-fit ​​cavity near the first engagement hole 111, and a second fitting gap is formed in the second snap-fit ​​cavity near the second engagement hole.

[0154] The structure of the receiving cavity matches the structure of the mounting part 603 to prevent the mounting part 603 from shifting and coming out of the receiving cavity during use; the fitting clearance provides a certain installation buffer space to facilitate the quick installation of the buffer block into place.

[0155] In some embodiments, such as Figure 7 As shown, the gap width δ1 of the first fitting gap satisfies 0.15mm≤δ1≤0.3mm; the gap width δ2 of the second fitting gap satisfies 0.15mm≤δ2≤0.3mm.

[0156] In some embodiments, the gap width δ1 of the first mating gap satisfies 0.15mm≤δ1≤0.3mm.

[0157] In some embodiments, the gap width δ2 of the second mating gap satisfies 0.15mm≤δ2≤0.3mm.

[0158] If the clearance is too large, the buffer block will not be installed securely and will easily shake. If the clearance is too small, it will be difficult to install and will affect the assembly efficiency. When the clearance width δ meets the requirement of 0.15mm≤δ≤0.3mm, it can ensure both the security and ease of installation.

[0159] In some embodiments, such as Figure 7 and Figure 9 As shown, the first mounting position also includes:

[0160] The first guide surface is formed at the first mounting position near the first engagement hole 111;

[0161] The second mounting position also includes:

[0162] The second guide surface is formed at the second mounting position near the second engagement hole.

[0163] In some embodiments, the first mounting position further includes a first guide surface, and the first mounting position is formed near the first engagement hole 111.

[0164] In some embodiments, the second mounting position further includes a second guide surface, and the second mounting position is formed near the second engagement hole.

[0165] In the three embodiments above, a guide surface 112 is provided at the mounting position, and the assembly efficiency of the mounting part 603 is improved under the guiding action of the guide surface 112.

[0166] In some embodiments, the first guide surface includes:

[0167] First inclined section;

[0168] The first gentle section is located on the outer wall surface near the first engaging hole 111;

[0169] The second guide surface includes:

[0170] The second inclined section;

[0171] The second gentle section is located on the outer wall near the second engagement hole.

[0172] In some embodiments, the first guide surface includes:

[0173] First inclined section;

[0174] The first gentle section is located on the outer wall near the first engaging hole 111.

[0175] In some embodiments, the second guide surface includes:

[0176] The second inclined section;

[0177] The second gentle section is located on the outer wall near the second engagement hole.

[0178] In the three embodiments above, the inclined section of the guide surface 112 provides installation guidance, while the gentle section 1121 avoids the formation of a sharp edge between the outer wall of the engagement hole and the guide surface 112, protecting the buffer block from being scratched.

[0179] like Figure 9 As shown, multiple ribs 113 are provided around the first slot 11. Each rib 113 has an inclination. The ribs 113 can guide the buffer block. The support of the ribs 113 can also prevent the contact area between the buffer block and the installation mating surface from being too large, thus improving the ease of installation of the buffer block. At the same time, it also plays a supporting and fixing role for the buffer block, improving the reliability of the installation.

[0180] In some embodiments, the center of the first engagement hole 111 is lower than the center of the second engagement hole.

[0181] The center of the first engaging hole 111 is lower than the center of the second engaging hole, which adapts to the offset of the mounting part 603 on the buffer block and serves to prevent mistaken installation when the forward buffer block 62 and the reverse buffer block 61 are installed upside down.

[0182] In some embodiments, the first slot 11 includes n first mounting positions arranged side by side, where n is a positive integer and n∈[1,4].

[0183] The number of first installation positions ranges from 1 to 4, and 1 to 4 reverse buffer blocks 61 can be set as needed to broaden the scope of application.

[0184] In some embodiments, the first slot 11 and the second slot are both disposed on the cover 1 near the hinge shaft 3; and at least two second slots are distributed on both sides of the first slot 11 along the axial direction of the hinge shaft 3.

[0185] The slot is located near the hinge shaft 3. After the buffer block is installed, it is closer to the housing 2, which makes it easier for the buffer block to contact the housing 2 during the flipping process of the cover 1 and provide buffering force.

[0186] In some embodiments, such as Figure 3 and Figure 4 As shown, the buffer block also includes:

[0187] The force-reducing hole 605 is located near the strong buffer section 601.

[0188] A force-reducing hole 605 is provided near the strong buffer section 601 to prevent the buffer block at the strong buffer section 601 from being too thick and having too high hardness, thereby preventing the generation of excessive elastic force and affecting normal buffering.

[0189] In some embodiments, the structure of the first buffer block is different from that of the second buffer block 63, and the arrangement direction of the strong buffer segment 601 and the weak buffer segment 602 of the first buffer block is opposite to that of the strong buffer segment 601 and the weak buffer segment 602 of the second buffer block 63.

[0190] Under the premise of meeting the resultant torque requirements, buffering is provided by buffer blocks with different structures. On the one hand, it can prevent mistaken installation and avoid incorrect installation. On the other hand, the different structural designs of the strong buffer section 601 and the weak buffer section 602 of the different buffer blocks can also achieve greater adjustment and matching possibilities.

[0191] In some embodiments, such as Figure 11 and Figure 12 As shown, the first buffer block adopts Figure 4 The structures of the reverse buffer block 61 and the second buffer block 63 shown are described in [reference needed]. Figure 10 The second buffer block 63 includes a second arc surface, and both the strong buffer section 601 and the weak buffer section 602 of the second buffer block 63 are formed on the second arc surface. During installation, the second buffer block 63 is placed in the middle, and the two first buffer blocks are installed on both sides of the second buffer block 63 at intervals. During installation, the strong buffer section 601 of the first buffer block is located on the upper side and the weak buffer section 602 is located on the lower side, while the weak buffer section 602 of the second buffer block 63 is located on the upper side and the strong buffer section 601 is located on the lower side.

[0192] It should be noted that the "upper side" and "lower side" of the strong buffer section 601 and the weak buffer section 602 mentioned in the embodiments of this utility model refer to the vertical position relationship of the strong buffer section 601 and the weak buffer section 602 of the buffer block when the cover 1 is in a horizontal state after the buffer block is assembled.

[0193] The strong buffer section 601 and the weak buffer section 602 of the second buffer block 63 are both formed on the second arc surface, resulting in a smoother transition and a simpler processing technology.

[0194] According to an embodiment of the present invention, another aspect provides a container, comprising:

[0195] Casing 2;

[0196] The cover has an opening and closing structure, with the cover 1 hinged to the shell 2.

[0197] Since the container is equipped with the opening and closing lid structure of this application, it has the same technical effect as the opening and closing lid structure, which will not be described in detail here.

[0198] In some embodiments, such as Figure 8 As shown, a third arc surface is formed at the mating point between the housing 2 and the buffer block, and the radius R of the third arc surface is...x satisfy:

[0199] 22.5mm≤R x ≤23.5mm.

[0200] The third arc surface also uses the hinge point as its center.

[0201] The radius of the third arc surface is compatible with the radius of the first and second arc surfaces on the buffer block, resulting in a good fit.

[0202] In some embodiments, the container is a cooking utensil.

[0203] With the synergistic effect of at least two buffer blocks, the buffer component 6 generates a larger buffer torque in the early and late stages of the opening stroke, and a smaller buffer torque in the middle stage of the opening stroke. This makes the resultant torque after adding the buffer component 6 change more gradually throughout the opening process, and the opening speed becomes more uniform. This reduces the impact on the shell 2, prevents the cooker from jumping out of the pot, improves the reliability of the cooking appliance, and provides a better user experience.

[0204] A specific embodiment of this utility model also provides a rice cooker, including the opening and closing lid structure of this utility model.

[0205] Figure 13 The curves showing the variation of the elastic torque of the elastic element 4, the gravitational torque of the lid, and the resultant torque with the opening angle (zero degrees when the lid is closed) are presented when no buffer block is set in the relevant technology. The resultant torque on the lid has a non-linear relationship with the opening angle of the lid. The resultant torque changes significantly in the early stage of opening and at the end of the opening stroke, resulting in a large impact.

[0206] The housing 2 includes a support ring disposed at its top, a hinge shaft 3 passing through the support ring, and a cover 1 hinged to the support ring to achieve a sealed engagement of the accommodating cavity (cooking cavity) formed by the housing 2. The cover 1 includes an inner cover and a decorative cover, with the inner cover located on the side of the cover 1 closer to the cooking cavity.

[0207] In this embodiment, as Figure 1 As shown, the opening and closing cover structure includes: an inner cover, a support ring, a hinge shaft, two hinge springs as elastic elements 4, a reverse buffer block 61, and two forward buffer blocks 62.

[0208] The hinge shaft passes through corresponding holes on the inner cover and the support ring, forming the basic structure of the opening and closing cover assembly; both hinge springs are torsion springs, fitted onto the hinge shaft, with one end of the hinge spring limited by the support ring and the other end installed at spring mounting position 5 on the inner cover; two positive buffer blocks 62 are respectively installed on the inner cover via their respective flexible snaps, such as... Figure 3As shown. The reverse buffer block 61, which is inverted from the forward buffer block 62, is installed in the first slot 11 on the inner cover. The structure of the first slot 11 is shown in [reference needed]. Figure 9 In this embodiment, only two first mounting positions are designed in the first slot 11. In actual application, the actual buffering force can be adjusted according to the elastic coefficient of the buffer block and the opening and closing cover structure. The number of first mounting positions n is n∈[1,4].

[0209] like Figure 7 As shown, θ represents the angle between the conical surface 6031 of the elastic buckle on the buffer block and its lower surface. The reference value range is θ∈[30°, 60°]. If the angle θ is too small, the buffer block will be difficult to install; if the angle θ is too large, the axial dimension of the buffer block will be too large. A small, gentle section 1121 is designed on the guide surface 112 of the support ring that mates with the conical surface 6031 of the elastic buckle. Its function is to reduce the possibility of sharp edges appearing at the hole position of the support ring, so as to avoid scratching the buffer block. δ represents the mating clearance of the flexible buckle after the buffer block is installed. If the mating clearance is too large, the buffer block will not be installed firmly and will easily wobble. If the mating clearance is too small, it will affect the efficiency of the assembly process. Therefore, the reference value range is δ∈[0.15mm, 0.3mm]. β represents the angle between the weak buffer section 602 of the buffer block and the parallel plane of the cross-section of the neck 604. Its size is positively correlated with the buffering force generated when the weak buffer section 602 is compressed. The reference value range is β∈[30°, 40°]. In the diagram, 'x' represents the distance between the compressed surface 6011 and the uncompressed surface of the buffer block, i.e., the amount of buffer deformation. The uncompressed surface represents the position of the buffer block in contact with the support ring in its fully relaxed state, while the compressed surface 6011 represents the surface of the buffer block after deformation. The amount of deformation 'x' varies depending on the opening angle of the rice cooker.

[0210]

[0211] Force analysis yields the following results:

[0212]

[0213] By iterating through different opening angles α (which are also angular displacements) within the integer domain, the corresponding x can be derived from the above formula, thus determining the relationship between the uncompressed surface and the compressed surface 6011 of the buffer block. In this embodiment, the reference values ​​for the elastic coefficients K1 and K2 of the hinge spring are K1∈[950N·mm / rad,1050N·mm / rad] and K2∈[400N·mm / rad,450N·mm / rad].

[0214] In this embodiment, the compressed surface 6011 can be approximately fitted as an arc surface with a radius of R at one end, and its reference value range is R∈[17.5mm,18.5mm]. In specific applications, if the elastic coefficient of the hinge spring, the elastic coefficient of the buffer block, and other parameters are different from the reference values ​​in this example, causing the compressed surface 6011 to be unable to be approximately fitted as an arc surface, then the compressed surface 6011 should be fitted using the above formula.

[0215] Depend on Figure 3 and Figure 4 It is known that the buffer block has a strong buffer section 601 and a weak buffer section 602. When the buffer block moves with the inner cover and is squeezed by the support ring, if the strong buffer section 601 is squeezed, the buffer block as a whole will produce a large elastic deformation, and thus generate a large elastic force, and vice versa. This utility model installs some buffer blocks in reverse so that the inner cover is subjected to the buffering force (elastic force) of the strong buffer section 601 and the buffering force (elastic force) of the weak buffer section 602 of the buffer block simultaneously throughout the entire opening stroke. As the opening angle increases, the squeezed part of the reverse buffer block 61 shifts from the weak buffer section 602 to the strong buffer section 601, and the generated elastic force gradually increases; the forward buffer block 62 is exactly the opposite, its squeezed part shifts from the strong buffer section 601 to the weak buffer section 602, and the generated elastic force gradually decreases, thereby making the change trend of the resultant torque on the inner cover tend to be gentle, achieving the purpose of buffering.

[0216] Given that the elastic torque generated by the pressure on the buffer block is opposite in direction to the resultant torque on the lid, as long as the buffer block generates a larger torque at the beginning and end of the lid opening stroke and a smaller torque during the lid opening stroke, the resultant torque after adding the buffer block will tend to change gradually throughout the lid opening process.

[0217] Therefore, by restricting the shape of the compressed surface of the buffer block through the relationship between the buffer deformation x and the opening angle mentioned above, the elastic deformation of the buffer block gradually increases (positive) and vice versa during the process of the buffer block being compressed from the weak buffer section 602 to the strong buffer section 601. That is, the elastic torque generated by the positive buffer block 62 gradually increases during the opening process, while the elastic torque generated by the negative buffer block 61 gradually decreases.

[0218] The resultant torque of the lid opening stroke is controlled to manage the impact and the shape of the compressed surface of the buffer block. In other words, the shape of the compressed surface of the buffer block is designed based on the changes in the resultant torque of the lid opening stroke.

[0219] This invention uses a reverse arrangement of buffer blocks to ensure that the change in the resultant torque on the lid 1 during movement remains relatively gradual, thereby reducing the impact of the lid 1 on the entire rice cooker during movement.

[0220] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A lid opening and closing structure adapted to be provided on a housing (2) of a container, characterized in that, include: A cover (1) having a hinge shaft (3); the cover (1) is adapted to be hinged to the housing (2) by means of the hinge shaft (3); An elastic element (4) is disposed on the hinge shaft (3) and provides an opening driving force to the cover (1); A buffer assembly (6) is installed on the cover (1) and / or the housing (2) and is able to make frictional contact with the housing (2) during the opening of the cover (1) to provide a buffering force opposite to the elastic force of the elastic member (4); The buffer assembly (6) includes at least two buffer blocks; part of the buffer blocks of the buffer assembly (6) are installed facing forward to form a forward buffer block (62), and another part of the buffer blocks are installed in reverse to form a reverse buffer block (61).

2. The lid opening and closing structure according to claim 1, characterized by The buffer block has a strong buffer section (601) and a weak buffer section (602). During the opening process, the strong buffer section (601) and the weak buffer section (602) make frictional contact with the shell (2) in a preset order.

3. The lid opening and closing structure according to claim 2, characterized by The strong buffer section (601) of the positive buffer block (62) is located on the lower side and the weak buffer section (602) is located on the upper side; the strong buffer section (601) of the reverse buffer block (61) is located on the upper side and the weak buffer section (602) is located on the lower side.

4. The opening and closing cover structure according to claim 1, characterized in that, The buffer block includes: Buffer body; A buffer mating part is located on the compression side of the buffer body, and at least the buffer mating part of the buffer body is made of an elastic material.

5. The opening and closing cover structure according to claim 4, characterized in that, The buffer mating part includes: The first arc surface, with the hinge axis (3) as the axis of rotation; The plane connects with the first arc surface.

6. The opening and closing cover structure according to claim 5, characterized in that, The first angle between the tangent of the first arc surface at the connection point and the plane is an obtuse angle.

7. The opening and closing cover structure according to claim 5, characterized in that, The buffer block has a strong buffer section (601) and a weak buffer section (602), with the first arc surface located in the strong buffer section (601) and the plane located in the weak buffer section (602).

8. The opening and closing cover structure according to claim 4, characterized in that, The buffer block has a strong buffer section (601) and a weak buffer section (602); the buffer mating part includes: The second arc surface is rotated about the hinge axis (3), and both the strong buffer section (601) and the weak buffer section (602) are formed on the second arc surface.

9. The opening and closing cover structure according to any one of claims 2, 3, 7, and 8, characterized in that, The friction stroke length between the strong buffer section (601) and the housing (2) is greater than the friction stroke length between the weak buffer section (602) and the housing (2).

10. The opening and closing cover structure according to claim 1, characterized in that, The cover (1) includes: A first card slot (11), at least one of the reverse buffer blocks (61) is disposed in the first card slot (11); The second card slot is spaced apart from the first card slot (11); at least one of the positive buffer blocks (62) is disposed in the second card slot.

11. The opening and closing cover structure according to claim 10, characterized in that, The first slot (11) is provided with at least one first mounting position, and the reverse buffer block (61) is detachably mounted in the first mounting position; And / or, the second slot is provided with at least one second mounting position, in which the positive buffer block (62) is detachably mounted.

12. The opening and closing cover structure according to claim 10, characterized in that, The first slot (11) and the second slot are both located on the cover (1) near the hinge shaft (3); and at least two of the second slots are distributed along the axial direction of the hinge shaft (3) on both sides of the first slot (11).

13. The opening and closing cover structure according to claim 2, characterized in that, The buffer block also includes: The force-reducing hole (605) is located near the strong buffer section (601).

14. A container, characterized in that, include: Shell (2); The opening and closing cover structure according to any one of claims 1 to 13, wherein the cover body (1) is hinged to the housing (2).

15. The container according to claim 14, characterized in that, The housing (2) and the buffer block form a third arc surface at the joint, with the hinge shaft (3) as the center.

16. The container according to claim 14 or 15, characterized in that, The container is a cooking utensil.

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