Cover opening and closing structure and container

Abstract

The invention relates to the technical field of buffer structures, and discloses a cover opening and closing structure and a container. The cover opening and closing structure comprises a cover body, an elastic piece and a buffer assembly installed on the cover body and / or the shell. The buffer assembly comprises at least two buffer blocks; the resultant moment of the buffering moment of the buffering assembly, the gravitational moment of the cover body and the elastic moment of the elastic piece is kept unchanged or close in the uncovering stroke, so that the resultant moment borne by the cover body changes gently in the uncovering process, the uncovering speed is more stable, the situation that the container jumps during automatic uncovering is avoided, and the use experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of buffer structures, and in particular to an opening and closing cover structure and a container. Background Art

[0002] The flip-opening structure of a container generally has a preloaded spring installed at the rotating shaft. After pressing the lid-opening button, the lid automatically opens due to the rebound action of the preloaded spring. If the elastic torque is less than the weight torque of the lid, the lid will not open completely. If the elastic torque is greater than the weight torque of the lid, it will easily cause the entire container to flip or even topple under the action of the elastic force. Taking the rice cooker as an example, the rice cooker jumping phenomenon is caused by the elastic torque of the hinge spring being greater than the weight torque of the lid. The currently commonly used solution is to first increase the elastic torque of the spring to ensure that the lid can be fully opened, and then solve the problem of the spring elastic torque being greater than the weight torque of the lid by adding a damper or buffer block.

[0003] When adding a damper, it is necessary to add a velocity term and solve the second-order differential equation to obtain the accurate damping value when calculating the motion state. The whole process is cumbersome, and it is not certain that a damper with a damping value that matches the required result can be found. It needs to be customized separately, which is too costly.

[0004] Buffer blocks are elastic bodies added between the lid and the shell. When the lid moves to a certain position during opening, they squeeze the buffer blocks, applying a torque opposite to the spring's, thus reducing the impact. However, the relationship between the elastic torque and the angle of movement is linear, while the relationship between the gravitational torque and the angle of movement is a cosine function, which is nonlinear. Therefore, no matter how the parameters are adjusted, the resultant torque acting on the lid during movement cannot maintain a relatively slow change trend. In other words, the lid cannot be opened at a relatively stable speed, and the container will still be subjected to significant impact, affecting the user experience. Summary of the Invention

[0005] In view of this, the present invention provides an opening and closing lid structure and a container to solve the problem that even if a buffer block is added, the resultant torque applied to the lid during the opening process cannot maintain a relatively slow change trend, 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, the present invention provides an opening and closing cover structure suitable for being arranged on a shell of a container, comprising:

[0007] The cover body has a hinge shaft; the cover body is suitable for being flipped and hinged to the housing through the hinge shaft;

[0008] an elastic member, disposed on the hinge shaft, and providing a driving force for opening the cover to the cover body;

[0009] a buffer assembly, mounted on the cover and / or the housing, capable of frictionally contacting the housing during the opening of the cover to provide a buffer force in the opposite direction to the elastic force of the elastic member;

[0010] The buffer assembly includes at least two buffer blocks; the combined torque of the buffer assembly, the gravity torque of the cover body and the elastic torque of the elastic member remains unchanged or close to each other during the cover opening stroke.

[0011] It should be noted that the resultant torque is close during the cover opening stroke, which means that after the buffer block is assembled due to production errors and installation errors, the resultant torque of the buffer assembly, the gravity torque of the cover body and the elastic torque of the elastic member are allowed to fluctuate within a very small range during the entire cover opening stroke. The change of the resultant torque is smooth, and the resultant torque approaches a smooth straight line parallel to the coordinate axis as the cover opening angle changes.

[0012] Beneficial effect: The combined torque of the buffering torque of the buffering assembly, the gravity torque of the cover body and the elastic torque of the elastic member remains unchanged or close during the cover opening stroke. Such an arrangement allows at least two buffer blocks to balance the large changes in the combined torque during the cover opening process, especially in the early and end stages of the cover opening stroke, so that the combined torque acting on the cover body remains unchanged or changes more slowly. The combined torque forms a straight line or approaches a straight line throughout the entire cover opening stroke. By balancing the nonlinear changes in the gravity torque through the buffering assembly, the cover opening speed is smoother, avoiding the container from jumping during automatic cover opening, and improving the user experience.

[0013] In an optional embodiment, the at least two buffer blocks include a first buffer block and a second buffer block; the force applied to the cover during the opening process satisfies the relationship:

[0014]

[0015] Where n2 is the number of the first buffer blocks, K2 is the elastic coefficient of the buffer blocks, and x α is the compression deformation of the first buffer block at different opening angles, α is the opening angle of the cover body, and α max is the maximum opening angle of the cover body, n1 is the number of the second buffer blocks, is the compression deformation of the second buffer block at different cover opening angles, K1 is the elastic coefficient of the elastic member, G is the gravity exerted on the cover body, and L is the distance from the center of gravity of the cover body to the hinge axis.

[0016] Beneficial effect: The force on the cover during opening satisfies the following relationship: It shows that during the entire opening process with the opening angle α as a variable, the resultant torque of the buffer assembly, the elastic torque of the elastic part and the body torque of the cover is 0, that is, the resultant torque remains unchanged. That is, under the coordinated action of the positive buffer block and the reverse buffer block, the buffer assembly generates a larger buffer torque in the early and end stages of the opening stroke, and a smaller buffer torque in the middle stage of the opening stroke, so that the resultant torque after adding the buffer assembly tends to change smoothly during the entire opening process, and the opening speed tends to be uniform, thereby reducing the impact on the shell.

[0017] In an optional embodiment, the buffer block has a strong buffer section and a weak buffer section, and during the cover opening process, the strong buffer section and the weak buffer section are in frictional contact with the shell in a preset order.

[0018] Beneficial Effects: The strong buffer section is the section 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 section where the buffer block exerts a lesser buffering force on the mating surface of the shell after being squeezed by the shell. Providing strong and weak buffer sections facilitates controlling the magnitude of the buffering torque by adjusting the contact sequence between the strong and weak buffer sections of different buffer blocks and the shell, thereby achieving the goal of maintaining a constant or gradually changing resultant torque throughout the entire lid opening process.

[0019] In an optional embodiment, the strong buffer section of a part of the buffer blocks of the buffer assembly is located on the lower side and the weak buffer section is located on the upper side to form a positive buffer block, and the strong buffer section of another part of the buffer blocks is located on the upper side and the weak buffer section is located on the lower side to form a reverse buffer block.

[0020] Beneficial effect: some buffer blocks of the buffer assembly are installed forward (with the strong buffer section at the lower side and the weak buffer section at the upper side) to form a forward buffer block, and the other part of the buffer blocks are installed reversely (with the strong buffer section at the upper side and the weak buffer section at the lower side) to form a reverse buffer block. During the process of opening the cover, the strong buffer section and the weak buffer section of the forward buffer block and the reverse buffer block respectively make frictional contact with the shell in a preset order. As the cover is opened, when the strong buffer section of the forward buffer block contacts the shell, the weak buffer section of the reverse buffer block contacts the shell, and when the weak buffer section of the forward buffer block contacts the shell, When the lid is opened, the strong buffer section of the reverse buffer block contacts the shell. With this arrangement, the combined torque of the buffer torque of the buffer block, the elastic torque of the elastic member and the gravity torque of the lid body can always maintain a sufficiently slow changing trend at different stages of opening the lid; especially in the early and final stages of the lid opening stroke, the cooperation of the strong buffer section and the weak buffer section is utilized to provide appropriate friction buffering force, thereby ensuring that the lid opening speed can maintain a stable state throughout the entire lid opening stroke, preventing the shell from being subjected to a large impact. Applying this structure to cooking appliances such as rice cookers can avoid the phenomenon of rice cooker jumping and enhance the user experience.

[0021] In addition, all buffer blocks of the buffer assembly are of the same type, and only one set of molds is required, which saves costs. When in use, some buffer blocks are installed forward and some buffer blocks are installed inverted, so that the strong buffer section and the weak buffer section can be matched to balance the nonlinear change of the gravity torque, so that the resultant torque acting on the cover body can maintain a slower change trend, and the cover opening is smoother and more reliable.

[0022] In an optional embodiment, the buffer block includes:

[0023] Buffer body;

[0024] A buffer fitting portion is located on the squeezed side of the buffer body, and at least the buffer fitting portion of the buffer body is made of elastic material; the strong buffer section and the weak buffer section are formed in the buffer fitting portion;

[0025] The mounting portion is arranged on the buffer body at a non-extrusion side away from the buffer fitting portion.

[0026] Beneficial effect: at least the buffer fitting part of the buffer body is made of elastic material, and the elastic deformation of the buffer fitting part after being squeezed by the shell is used to provide friction resistance when the cover rotates. The structure is simple and the buffer reliability is high.

[0027] In an optional embodiment, the strong buffer section is connected to the weak buffer section, and the surface where the strong buffer section is located forms an angle with the surface where the weak buffer section is located.

[0028] Beneficial effect: The connected strong buffer section and weak buffer section form an angle between their surfaces, which adapt to different stages of the lid opening stroke, ensuring that the lid opening speed can remain stable throughout the entire lid opening stroke, and preventing the shell from being subjected to a large impact.

[0029] In an optional embodiment, the strong buffer section includes a first arc surface, the weak buffer section includes a plane, and the first arc surface is connected to the plane.

[0030] Beneficial effect: Under the premise of meeting the resultant torque requirements, the arc surface of the strong buffer section is easy to design and manufacture, and the plane of the weak buffer section is easy to process.

[0031] In an optional embodiment, the arc radius R0 of the first arc surface satisfies 18 mm ≤ R0 ≤ 19 mm, which can provide a buffer torque of appropriate size when subjected to extrusion deformation.

[0032] In an optional embodiment, the buffer block further includes a neck, and the mounting portion is connected to the buffer body via the neck.

[0033] Beneficial effect: The setting of the neck makes it easier for the buffer block to be set in the matching structure of the inner cover through the mounting portion, thereby achieving limited matching and increasing the convenience of installation.

[0034] In an optional embodiment, the angle between the plane where the weak buffer section is located and the parallel plane of the cross section of the neck is β, and the angle β satisfies 30°≤β≤40°.

[0035] Beneficial Effects: If the angle β between the weak buffer section and the parallel plane of the neck cross section is less than 30°, the weak buffer section has a small elastic force when squeezed, failing to achieve its purpose of being used in conjunction with the strong buffer section. If the angle β is greater than 40°, the weak buffer section has a large elastic force when squeezed, and when combined with the buffering force of the strong buffer section, the buffering torque is too large, making it impossible to achieve a smooth change in the resultant torque at the beginning and end of the opening stroke. When the angle β satisfies 30°≤β≤40°, the resultant torque changes very smoothly at the beginning and end of the opening stroke, and the opening speed tends to be constant throughout the entire opening stroke.

[0036] In an optional embodiment, in the first direction of arranging the strong buffer section and the weak buffer section, the mounting portion is eccentrically arranged on the non-extrusion side.

[0037] Beneficial effect: In the first direction of arranging the strong buffer section and the weak buffer section, the mounting portion is eccentrically arranged on the non-extrusion side, so that the height of the mounting portion is different during forward installation and reverse installation, and the center heights of the first snap-fitting hole corresponding to the reverse buffer block and the second snap-fitting hole corresponding to the forward buffer block on the cover body are also different, which plays an anti-mistake effect, ensures the correct installation of the forward buffer block and the reverse buffer block, and avoids the situation where the forward buffer block and the reverse buffer block are installed in the wrong direction or in the wrong position.

[0038] In an optional embodiment, the mounting portion includes a frustum-shaped elastic buckle.

[0039] Beneficial effects: The elastic buckle is easy to install and disassemble, the clamping method is easy to operate, and it is also convenient for maintenance and replacement of the buffer block as needed; the elastic buckle adopts a frustum shape, and the conical surface is used as the installation guide surface to improve the convenience of installation, and the lower bottom surface of the frustum is used as the limiting surface, which has a simple structure.

[0040] In an optional embodiment, the angle θ between the conical surface of the frustum-shaped elastic buckle and its upper bottom surface satisfies 30°≤θ≤60°.

[0041] Beneficial effect: If the angle θ between the conical surface 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 size of the buffer block will be too large. The angle θ satisfies 30°≤θ≤60°, which improves the installation convenience and facilitates the installation of the buffer block into the limited space on the cover body, avoiding increasing the product volume.

[0042] In an optional embodiment, the cover includes:

[0043] a first card slot, wherein at least one reverse buffer block is disposed in the first card slot;

[0044] The second card slot is spaced apart from the first card slot; at least one positive buffer block is disposed in the second card slot.

[0045] Beneficial effect: the reverse buffer block and the forward buffer block are respectively arranged in the first card slot and the second card slot on the cover body, thereby improving the installation reliability of the buffer blocks.

[0046] In an optional embodiment, the first card slot is provided with at least one first installation position, and the reverse buffer block is detachably installed in the first installation position;

[0047] And / or, the second slot is provided with at least one second installation position, and the positive buffer block is detachably installed in the second installation position.

[0048] Beneficial effect: The installation positions for accommodating the buffer blocks are arranged in the first card slot and / or the second card slot. The number of first installation positions in the first card slot and the number of second installation positions in the second card slot can be determined according to the number of reverse buffer blocks and forward buffer blocks, so that each buffer block is correspondingly set in a installation position.

[0049] In an optional embodiment, the first installation position includes:

[0050] a first buckle accommodating cavity;

[0051] a first engaging hole, through which the mounting portion of the reverse buffer block is disposed in the first buckle accommodating cavity;

[0052] And / or, the second installation location includes:

[0053] a second buckle accommodating cavity;

[0054] A second engaging hole, through which the mounting portion of the positive buffer block passes and is disposed in the second buckle accommodating cavity.

[0055] Beneficial effect: The installation position includes a snap-fit ​​accommodating cavity and a snap-fit ​​hole, which facilitates the installation part to pass through the snap-fit ​​hole and be set in the accommodating cavity to achieve the purpose of reliable fixation.

[0056] In an optional embodiment, the structure of the first snap-fit ​​accommodating cavity and the structure of the second snap-fit ​​accommodating cavity both match the structure of the mounting portion, and a first fitting gap is formed in the first snap-fit ​​accommodating cavity near the first snap-fit ​​hole, and a second fitting gap is formed in the second snap-fit ​​accommodating cavity near the second snap-fit ​​hole.

[0057] Beneficial effects: The structure of the accommodating cavity matches the structure of the mounting portion, preventing the mounting portion from being displaced and falling out of the accommodating cavity during use; a certain installation buffer space is provided by setting the fitting clearance, which facilitates the quick installation of the buffer block.

[0058] In an optional embodiment, the gap width δ1 of the first fitting gap satisfies 0.15mm≤δ1≤0.3mm; and / or the gap width δ2 of the second fitting gap satisfies 0.15mm≤δ2≤0.3mm.

[0059] Beneficial effect: If the fitting clearance is too large, the buffer block will not be installed firmly and will easily shake. If the fitting clearance is too small, it will be difficult to install, affecting the assembly efficiency. When the gap width δ satisfies 0.15mm≤δ≤0.3mm, it can ensure both firmness and convenience of installation.

[0060] In an optional embodiment, the first installation position further includes:

[0061] a first guide surface formed at the first installation position near the first engaging hole;

[0062] And / or, the second installation location further includes:

[0063] The second guide surface is formed at the second installation position close to the second engaging hole.

[0064] Beneficial effect: a guide surface is provided at the installation position, and the assembly efficiency of the installation part is improved under the guiding effect of the guide surface.

[0065] In an optional embodiment, the first guide surface includes:

[0066] a first inclined section;

[0067] A first flat section is located near the outer wall of the first engaging hole;

[0068] And / or, the second guide surface includes:

[0069] a second inclined section;

[0070] The second flat section is located near the outer wall of the second engaging hole.

[0071] Beneficial effect: the inclined section of the guide surface provides an installation guide, and the flat section avoids the formation of sharp edges between the outer wall of the engaging hole and the guide surface, thereby protecting the buffer block from being easily scratched.

[0072] In an optional embodiment, the center of the first engaging hole is lower than the center of the second engaging hole.

[0073] Beneficial effect: The center of the first engaging hole is lower than the center of the second engaging hole, which adapts to the offset of the mounting portion on the buffer block and plays a role in preventing the forward buffer block and the reverse buffer block from being inverted when being installed.

[0074] In an optional embodiment, the first card slot includes n first installation positions arranged side by side, where n is a positive integer and n∈[1,4].

[0075] Beneficial effect: The number of first installation positions ranges from 1 to 4, and 1 to 4 reverse buffer blocks can be set as needed to broaden the scope of application.

[0076] In an optional embodiment, the first card slot and the second card slot are both arranged on the cover body near the hinge shaft; and at least two second card slots are distributed on both sides of the first card slot along the axial direction of the hinge shaft.

[0077] Beneficial effect: the card slot is arranged near the hinge axis, and the buffer block is closer to the shell after being installed, so that the buffer block is convenient to contact with the shell during the flipping process of the cover body to provide buffering force.

[0078] In an optional embodiment, the buffer block further includes:

[0079] The force reducing hole is opened near the strong buffer section.

[0080] Beneficial effect: The force-reducing hole is arranged near the strong buffer section to avoid the buffer block in the strong buffer section being too thick and resulting in too high hardness, thereby preventing excessive elastic force from affecting normal buffering.

[0081] In an optional embodiment, the structure of the first buffer block is different from that of the second buffer block, and the arrangement direction of the strong buffer segment and the weak buffer segment of the first buffer block is opposite to that of the second buffer block.

[0082] Beneficial effect: 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 mistakes during installation and avoid installation errors. On the other hand, the different structural designs of the strong buffer sections and weak buffer sections of different buffer blocks can also achieve greater adjustment and matching possibilities.

[0083] In an optional embodiment, the second buffer block includes a second arc surface, and the strong buffer section and the weak buffer section of the second buffer block are both formed on the second arc surface.

[0084] Beneficial effect: the strong buffer section and the weak buffer section of the second buffer block are both formed on the second arc surface, the transition is smoother, and the processing technology is simple.

[0085] In an optional embodiment, the arc radius R1 of the second arc surface satisfies 21 mm ≤ R1 ≤ 22 mm.

[0086] Beneficial effect: when 21mm≤R1≤22mm is satisfied, the second buffer block can provide a buffer torque of appropriate size when deformed by extrusion.

[0087] In a second aspect, the present invention further provides a container, comprising:

[0088] case;

[0089] In any of the above-mentioned opening and closing cover structures, the cover body is hinged to the shell.

[0090] Beneficial effect: Since the container is provided with the opening and closing cover structure of the present application, it has the same technical effect as the opening and closing cover structure, which will not be described in detail here.

[0091] In an optional embodiment, a third arc surface is formed at the joint between the housing and the buffer block, and the arc radius R of the third arc surface is x satisfy:

[0092] 22.5mm≤R x ≤23.5mm.

[0093] Beneficial effect: the arc radius of the third arc surface is adapted to the arc radii of the first arc surface and the second arc surface on the buffer block, and the matching effect is good.

[0094] In an optional embodiment, the container is a cooking utensil.

[0095] Beneficial effect: Under the coordinated action of at least two buffer blocks, the buffer assembly generates a larger buffer torque in the early and end stages of the lid opening stroke, and generates a smaller buffer torque in the middle stage of the lid opening stroke, so that the combined torque after adding the buffer assembly tends to change smoothly during the entire process of opening the lid, and the lid opening speed tends to be uniform, thereby reducing the impact on the shell, preventing the pot from jumping, improving the reliability of the cooking appliance, and providing a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0097] Figure 1 A three-dimensional structural diagram of an opening and closing cover structure according to an embodiment of the present invention;

[0098] Figure 2 for Figure 1 A partial enlarged structural diagram of part A;

[0099] Figure 3 A three-dimensional structural diagram of a positive buffer block according to an embodiment of the present invention;

[0100] Figure 4 A three-dimensional structural diagram of a reverse buffer block according to an embodiment of the present invention;

[0101] Figure 5 This is a first cross-sectional structural diagram of an opening and closing cover structure according to an embodiment of the present invention, showing the connection relationship between the positive buffer block and the cover body in the closed state;

[0102] Figure 6 This is a second cross-sectional structural diagram of an openable and closable cover structure according to an embodiment of the present invention, showing the connection between the reverse buffer block and the cover body in the closed state;

[0103] Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure of part C in the middle;

[0104] Figure 8 It is a structural schematic diagram of the buffering cooperation state between the reverse buffer block and the shell during the opening process of the opening and closing cover structure of the present invention;

[0105] Figure 9 This is a three-dimensional structural diagram of a first card slot according to an embodiment of the present invention;

[0106] Figure 10 A three-dimensional structural diagram of the second buffer block of the present invention is provided;

[0107] Figure 11 This is a schematic diagram of an assembled state of a buffer assembly according to another embodiment of the present invention, in which the structures of the two buffer blocks are different;

[0108] Figure 12 for Figure 11 A partial enlarged structural diagram of part B;

[0109] Figure 13 The curve is a relationship between the elastic moment of the elastic member, the gravity moment of the pot lid and the resultant moment as the lid opening angle changes when no buffer block is provided in the related art;

[0110] Figure 14 A schematic diagram of the state when the variation curve of the resultant torque M1 and the variation curve of the resultant torque M0 form a symmetrical curve is given.

[0111] Description of reference numerals:

[0112] 1. Cover;

[0113] 11. First engaging groove; 111. First engaging hole; 112. Guide surface; 1121. Flat section; 113. Rib;

[0114] 2. Shell;

[0115] 3. Articulated shaft;

[0116] 4. Elastic parts;

[0117] 5. Spring installation position;

[0118] 6. Buffer component;

[0119] 61. Reverse buffer block; 62. Forward buffer block; 63. Second buffer block;

[0120] 601, strong buffer section; 6011, compressed surface; 602, weak buffer section; 603, mounting portion; 6031, conical surface; 604, neck; 605, force reduction hole. DETAILED DESCRIPTION

[0121] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0122] In the description of the invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0123] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention depending on the specific circumstances.

[0124] The following combination Figures 1 to 14 , describing embodiments of the present invention.

[0125] According to an embodiment of the present invention, on the one hand, Figure 1 and Figure 2 As shown, an opening and closing cover structure is provided, which is suitable for being arranged on the shell 2 of the container, comprising:

[0126] The cover 1 has a hinge shaft 3; the cover 1 is suitable for being flipped and hinged to the housing 2 through the hinge shaft 3;

[0127] The elastic member 4 is provided on the hinge shaft 3 to provide the cover body 1 with a driving force for opening the cover;

[0128] The buffer assembly 6 is mounted on the cover 1 and is capable of frictionally contacting the housing 2 during the opening process of the cover 1 to provide a buffer force opposite to the elastic force of the elastic member 4;

[0129] The buffer assembly 6 includes at least two buffer blocks; the combined torque of the buffer torque of the buffer assembly 6, the gravity torque of the cover body 1 and the elastic torque of the elastic member 4 remains unchanged or close to each other during the cover opening stroke.

[0130] Assume that the resultant moment of the buffer torque generated by at least two buffer blocks is M1, and the resultant moment of the gravity moment of the cover body 1 and the elastic moment of the elastic member 4 is M0. In the opening stroke, the curve of the change of the resultant moment M1 with the opening angle forms a symmetrical curve of the curve of the change of the resultant moment M0 with the opening angle (see Figure 14 ) or approximately symmetrical curves.

[0131] The resultant torque of the buffering torque of the buffering assembly 6, the gravity torque of the cover body 1 and the elastic torque of the elastic member 4 remains unchanged or close during the cover opening stroke. With such an arrangement, during the cover opening process, especially in the early and end stages of the cover opening stroke, at least two buffer blocks can balance the large changes in the resultant torque, so that the change in the resultant torque on the cover body 1 is smoother, and the resultant torque approaches a straight line throughout the entire cover opening stroke. By balancing the nonlinear changes in the gravity torque through the buffering assembly 6, the cover opening speed is smoother, avoiding the container from jumping when the cover is automatically opened, and improving the user experience.

[0132] It should be noted that the resultant torque is close during the cover opening stroke, which means that after the buffer block is assembled due to production errors and installation errors, the resultant torque of the buffer assembly 6, the gravity torque of the cover body 1 and the elastic torque of the elastic member 4 are allowed to fluctuate within a very small range during the entire cover opening stroke, and the change of the resultant torque is smooth. The resultant torque approaches a smooth straight line parallel to the coordinate axis as the cover opening angle changes.

[0133] It should be noted that the frictional contact between the buffer assembly 6 and the housing 2 can be caused by the elastic deformation of the buffer block itself when the buffer block and the housing 2 are squeezed together, resulting in an extrusion rebound force. Of course, a friction structure can also be provided on the surface of the buffer block, and this is not specifically limited here, as long as it can provide a buffer damping in the opposite direction of the rebound force of the elastic member 4.

[0134] In some other embodiments, the buffer assembly 6 can also be mounted on the housing 2 and can frictionally contact the cover 1 during the opening process. After being squeezed and deformed, the at least two buffer blocks of the buffer assembly 6 can provide a buffering force opposite to the elastic force of the cover 1 and the elastic member 4. Of course, in actual applications, some of the at least two buffer blocks can be mounted on the upper cover 1, while the other buffer blocks are mounted on the housing. In specific applications, the installation position of the buffer blocks can be determined based on a combination of considerations such as the installation space and product structure.

[0135] In some embodiments, the at least two buffer blocks include a first buffer block and a second buffer block 63; the force applied to the cover body 1 during the opening process satisfies the relationship:

[0136]

[0137] Where 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 as the basis, x α is the compression deformation of the first buffer block at different opening angles, α is the opening angle of the cover body 1, and α max is the maximum opening angle of the cover body 1, n1 is the number of the second buffer blocks 63, is the compression deformation of the second buffer block 63 at different cover opening angles, K1 is the elastic coefficient of the elastic member 4, G is the gravity exerted on the cover body 1, and L is the distance from the center of gravity of the cover body 1 to the hinge axis 3.

[0138] The force on the cover body 1 during the opening process satisfies the following relationship: It shows that during the entire process of opening the cover with the opening angle α as a variable, the resultant torque of the buffering torque of the buffering assembly 6, the elastic torque of the elastic member 4 and the gravity torque of the cover body 1 is 0, that is, under the coordinated action of the positive buffer block 62 and the reverse buffer block 61, the buffering assembly 6 generates a larger buffering torque in the early and end stages of the opening stroke, and generates a smaller buffering torque in the middle stage of the opening stroke, so that the resultant torque after adding the buffering assembly 6 tends to change smoothly during the entire process of opening the cover, and the opening speed tends to be uniform, thereby reducing the impact on the shell.

[0139] In the following embodiments, at least two buffer blocks are identical. However, in other embodiments, the at least two buffer blocks may be different, including having different structures, sizes, or materials, as long as the variation curve of the resultant moment M1 of the buffering torque generated by the buffer assembly 6 forms a nonlinear symmetrical curve of the variation curve of the resultant moment M0 of the gravity moment of the cover body 1 and the elastic moment of the elastic member 4.

[0140] In some embodiments, 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 of the cover, the strong buffer section 601 and the weak buffer section 602 are in frictional contact with the shell 2 in a preset order; some buffer blocks of the buffer assembly 6 are installed in a forward direction to form a forward buffer block 62, and the other part of the buffer blocks are installed in a reverse direction to form a reverse buffer block 61.

[0141] The strong buffer section 601 is a section where the buffer force acting on the mating surface of the shell 2 is larger after being squeezed by the shell 2 , while the weak buffer section 602 is a section where the buffer force acting on the mating surface of the shell 2 is smaller after being squeezed by the shell 2 .

[0142] Part 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 reverse and upside down to form a reverse buffer block 61. During the process of opening the cover, the strong buffer section 601 and the weak buffer section 602 of the forward buffer block 62 and the reverse buffer block 61 are respectively in friction contact with the shell 2 in a preset order. As the cover is opened, when the strong buffer section 601 of the forward buffer block 62 contacts the shell 2, the weak buffer section 602 of the reverse buffer block 61 contacts the shell 2, and when the weak buffer section 602 of the forward buffer block 62 contacts the shell 2, the strong buffer section 601 of the reverse buffer block 61 contacts the shell 2. The punch section 601 is in contact with the shell 2. With such an arrangement, the combined torque of the buffering torque of the buffer block, the elastic torque of the elastic member 4 and the gravity torque of the cover body 1 can always maintain a sufficiently slow changing trend at different stages of opening the cover; especially in the early and final stages of the cover opening stroke, the strong buffer section 601 and the weak buffer section 602 are used in conjunction to provide appropriate friction buffering force, ensuring that the cover opening speed can maintain a stable state throughout the entire cover opening stroke, preventing the shell 2 from being subjected to a large impact. Applying this structure to cooking appliances such as rice cookers can avoid the phenomenon of rice cooker jumping and enhance the user experience.

[0143] In addition, all buffer blocks of the buffer assembly 6 are of the same type, and only one set of molds is required, which saves costs. When in use, some buffer blocks are installed forwardly and some buffer blocks are installed inverted, so that the strong buffer section 601 and the weak buffer section 602 can be matched to balance the nonlinear change of the gravity torque, so that the resultant torque acting on the cover body 1 can maintain a relatively slow change trend, and the opening of the cover is smoother and more reliable. Figure 8 The extrusion fit state between the reverse buffer block 61 and the housing 2 during the cover opening process is shown.

[0144] In some embodiments, as Figure 3 and Figure 4 As shown, the buffer block includes:

[0145] Buffer body;

[0146] The buffer fitting portion is located on the squeezed side of the buffer body, and at least the buffer fitting portion of the buffer body is made of elastic material; the strong buffer section 601 and the weak buffer section 602 are formed in the buffer fitting portion;

[0147] The mounting portion 603 is disposed on the non-extrusion side of the buffer body away from the buffer fitting portion.

[0148] At least the buffer fitting portion of the buffer body is made of elastic material, and the elastic deformation of the buffer fitting portion after being squeezed by the shell 2 is utilized to provide friction resistance when the cover body 1 rotates. The structure is simple and the buffer reliability is high.

[0149] It should be noted that, in the following embodiments, in order to facilitate molding and processing, the buffer body, the buffer fitting portion and the mounting portion 603 of the buffer block are integrally molded, and the buffer block is made of elastic material.

[0150] In some embodiments, the strong buffer section 601 is connected to the weak buffer section 602 , and the surface where the strong buffer section 601 is located forms an angle with the surface where the weak buffer section 602 is located.

[0151] The connected strong buffer section 601 and weak buffer section 602 have an angle between their surfaces, which adapts to different stages of the lid opening stroke, ensures that the lid opening speed can be kept stable throughout the entire lid opening stroke, and prevents the shell 2 from being subjected to a large impact.

[0152] The length of the strong buffer section 601 is greater than that of the weak buffer section 602 , ensuring that the resultant torque acting on the cover body 1 changes more gradually during the entire opening stroke.

[0153] In some embodiments, the strong buffer section 601 includes a first arc surface, the weak buffer section 602 includes a plane, and the first arc surface is connected to the plane.

[0154] On the premise of meeting the resultant torque requirement, the arc surface of the strong buffer section 601 is convenient for design and manufacture, and the flat surface of the weak buffer section 602 is convenient for processing.

[0155] In some embodiments, the arc radius R0 of the first arc surface satisfies 18 mm ≤ R0 ≤ 19 mm, and can provide a buffer torque of appropriate size when deformed by extrusion.

[0156] In some embodiments, the arc radius R1 of the second arc surface satisfies 21 mm ≤ R1 ≤ 22 mm.

[0157] The radius of the second arc surface satisfies 21mm≤R1≤22mm, and the second buffer block can provide a buffer torque of appropriate size when it is squeezed and deformed.

[0158] The thickness value of the second buffer block 63 at the portion corresponding to the strong buffer section 601 is h1 = (4.6±0.3) mm, and the thickness value of the second buffer block 63 at the portion corresponding to the weak buffer section 602 is h2 = (3.5±0.3) mm.

[0159] The thicker end of the second arc surface of the second buffer block 63 provides a greater extrusion rebound force, and is a strong buffer section 601 ; while the thinner end of the second arc surface provides a smaller extrusion rebound force, and is a weak buffer section 602 .

[0160] It should be noted that the first arc surface and the second arc surface are both arranged with the hinge point of the cover body 1 as the center.

[0161] In some embodiments, the buffer block further includes a neck portion 604 , and the mounting portion 603 is connected to the buffer body via the neck portion 604 .

[0162] The setting of the neck 604 makes it easier for the buffer block to be set in the matching structure of the inner cover through the mounting portion 603, thereby achieving limited fit and increasing the convenience of installation.

[0163] In some embodiments, as Figure 7 As shown, the angle β formed between the plane where the weak buffer section 602 is located and the parallel plane of the cross section of the neck 604 is 30°≤β≤40°.

[0164] If the angle β formed between the weak buffer section 602 and the parallel plane of the cross section of the neck 604 is less than 30°, the elastic force of the weak buffer section 602 when squeezed 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 when squeezed is large. When combined with the elastic force of the strong buffer section 601 when squeezed, the buffering torque is too large, and the goal of achieving a smooth change in the resultant torque in the early and final stages of the lid opening stroke cannot be achieved. When the angle β satisfies 30°≤β≤40°, the resultant torque changes very smoothly in the early and final stages of the lid opening stroke, and the lid opening speed tends to be constant throughout the entire lid opening stroke.

[0165] In some embodiments, in the first direction of arranging the strong buffer section 601 and the weak buffer section 602 , the mounting portion 603 is eccentrically disposed on the non-extrusion side.

[0166] In the first direction of arranging the strong buffer section 601 and the weak buffer section 602, the mounting portion 603 is eccentrically arranged on the non-extrusion side, so that the height of the mounting portion 603 is different during forward installation and reverse installation, and the center heights of the first snap-fit ​​hole 111 corresponding to the reverse buffer block 61 and the second snap-fit ​​hole corresponding to the forward buffer block 62 on the cover body 1 are also different, which plays an anti-mistake effect, ensures the correct installation of the forward buffer block 62 and the reverse buffer block 61, and avoids the situation where the forward buffer block 62 and the reverse buffer block 61 are installed in the wrong direction or position.

[0167] In some embodiments, the mounting portion 603 includes a frustum-shaped elastic buckle.

[0168] The elastic clip is used for easy installation and disassembly. The clip-on method is easy to operate and also convenient for maintenance and replacement of the buffer block as needed. The elastic clip adopts a frustum shape, and the conical surface 6031 is used as the installation guide surface to improve the installation convenience. The lower bottom surface of the frustum is used as the limit surface, and the structure is simple.

[0169] Specifically, the elastic buckle is in the shape of a truncated cone with small edges, making installation more convenient.

[0170] In some embodiments, as Figure 7 As shown, the angle θ between the conical surface 6031 of the frustum-shaped elastic buckle and its upper bottom surface satisfies 30°≤θ≤60°.

[0171] 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 size of the buffer block will be too large. The angle θ satisfies 30°≤θ≤60°, which improves the installation convenience and facilitates the installation of the buffer block into the limited space on the cover body 1, avoiding increasing the product volume.

[0172] In some embodiments, the cover 1 includes:

[0173] A first card slot 11, wherein at least one reverse buffer block 61 is disposed in the first card slot 11;

[0174] 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.

[0175] The reverse buffer block 61 and the forward buffer block 62 are respectively disposed in the first slot 11 and the second slot on the cover 1 , thereby improving the installation reliability of the buffer blocks.

[0176] In some embodiments, the first card slot 11 is provided with at least one first installation position, and the reverse buffer block 61 is detachably installed in the first installation position;

[0177] The second slot is provided with at least one second installation position, and the positive buffer block 62 is detachably installed in the second installation position.

[0178] The mounting positions for accommodating the buffer blocks are arranged in the first card slot 11 and / or the second card slot. The number of the first mounting positions in the first card slot 11 and the number of the second mounting positions in the second card slot can be determined according to the number of the reverse buffer blocks 61 and the forward buffer blocks 62, so that each buffer block is correspondingly set in a mounting position.

[0179] In some embodiments, the first mounting location includes:

[0180] a first buckle accommodating cavity;

[0181] A first engaging hole 111, through which the mounting portion 603 of the reverse buffer block 61 is disposed in the first buckle accommodating cavity;

[0182] The second installation location includes:

[0183] a second buckle accommodating cavity;

[0184] The second engaging hole, through which the mounting portion 603 of the positive buffer block 62 passes, is disposed in the second buckle accommodating cavity.

[0185] In some embodiments, the first mounting location includes:

[0186] a first buckle accommodating cavity;

[0187] The first engaging hole 111 , through which the mounting portion 603 of the reverse buffer block 61 passes, is disposed in the first buckle accommodating cavity.

[0188] In some embodiments, the second mounting location includes:

[0189] a second buckle accommodating cavity;

[0190] The second engaging hole, through which the mounting portion 603 of the positive buffer block 62 passes, is disposed in the second buckle accommodating cavity.

[0191] In the above three embodiments, the mounting position includes a buckle receiving cavity and a snap-fit ​​hole, so that the mounting portion 603 can be passed through the snap-fit ​​hole and set into the buckle receiving cavity to achieve reliable fixation.

[0192] In some embodiments, the structure of the first snap-fit ​​accommodating cavity and the structure of the second snap-fit ​​accommodating cavity both match the structure of the mounting portion 603, and the first snap-fit ​​accommodating cavity forms a first fitting gap near the first snap-fit ​​hole 111, and the second snap-fit ​​accommodating cavity forms a second fitting gap near the second snap-fit ​​hole.

[0193] The structure of the accommodating cavity matches the structure of the mounting portion 603 to prevent the mounting portion 603 from being displaced and falling out of the accommodating cavity during use; a matching gap is provided to provide a certain installation buffer space, which facilitates the quick installation of the buffer block.

[0194] In some embodiments, 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.

[0195] In some embodiments, the gap width δ1 of the first fitting gap satisfies 0.15 mm ≤ δ1 ≤ 0.3 mm.

[0196] In some embodiments, the gap width δ2 of the second fitting gap satisfies 0.15 mm ≤ δ2 ≤ 0.3 mm.

[0197] If the fit clearance is too large, the buffer block will not be installed firmly and will easily shake. If the fit clearance is too small, it will be difficult to install, affecting the assembly efficiency. When the gap width δ satisfies 0.15mm≤δ≤0.3mm, it can ensure both firmness and convenience of installation.

[0198] In some embodiments, as Figure 7 and Figure 9 As shown, the first installation position also includes:

[0199] A first guide surface is formed at the first installation position near the first engaging hole 111;

[0200] The second installation location also includes:

[0201] The second guide surface is formed at the second installation position close to the second engaging hole.

[0202] In some embodiments, the first mounting position further includes a first guide surface, and the first mounting position is formed at the first mounting position close to the first engaging hole 111 .

[0203] In some embodiments, the second mounting position further includes a second guide surface, and the second mounting position is formed at the second mounting position close to the second engaging hole.

[0204] In the above three embodiments, the guide surface 112 is provided at the installation position, and the assembly efficiency of the installation portion 603 is improved under the guiding effect of the guide surface 112 .

[0205] In some embodiments, the first guide surface comprises:

[0206] a first inclined section;

[0207] The first flat section is located near the outer wall of the first engaging hole 111;

[0208] The second guide surface comprises:

[0209] a second inclined section;

[0210] The second flat section is located near the outer wall of the second engaging hole.

[0211] In some embodiments, the first guide surface comprises:

[0212] a first inclined section;

[0213] The first flat section is located near the outer wall of the first engaging hole 111 .

[0214] In some embodiments, the second guide surface comprises:

[0215] a second inclined section;

[0216] The second flat section is located near the outer wall of the second engaging hole.

[0217] In the above three embodiments, the inclined section of the guide surface 112 provides an installation guide, and the flat section 1121 avoids forming a sharp edge between the outer wall of the engaging hole and the guide surface 112, thereby protecting the buffer block from being scratched.

[0218] like Figure 9 As shown, a plurality of ribs are provided on the peripheral side of the first slot, and each rib has an inclination. The ribs can guide the buffer block. The support of the ribs can also avoid excessive contact area between the buffer block and the mounting mating surface, thereby improving the installation convenience of the buffer block. At the same time, the ribs also play a role in supporting and fixing the buffer block, thereby improving the installation reliability.

[0219] In some embodiments, the center of the first engaging hole 111 is lower than the center of the second engaging hole.

[0220] 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 portion 603 on the buffer block and plays a role in preventing the positive buffer block 62 and the reverse buffer block 61 from being installed upside down.

[0221] In some embodiments, the first card slot 11 includes n first installation positions arranged side by side, where n is a positive integer and n∈[1,4].

[0222] The number of the first installation positions ranges from 1 to 4, and 1 to 4 reverse buffer blocks 61 can be provided as needed to broaden the scope of application.

[0223] In some embodiments, the first card slot 11 and the second card slot are both disposed on the cover 1 near the hinge shaft 3 ; and at least two second card slots are distributed on both sides of the first card slot 11 along the axial direction of the hinge shaft 3 .

[0224] The card slot is arranged near the hinge shaft 3 , and the buffer block is closer to the shell 2 after being installed, so that the buffer block can contact with the shell 2 and provide buffering force when the cover body 1 is turned over.

[0225] In some embodiments, as Figure 3 and Figure 4 As shown, the buffer block also includes:

[0226] The force reducing hole 605 is opened near the strong buffer section 601 .

[0227] 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 resulting in too high a hardness, thereby preventing excessive elastic force from being generated and affecting normal buffering.

[0228] 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 the arrangement direction of the strong buffer segment 601 and the weak buffer segment 602 of the second buffer block 63 .

[0229] On the premise of meeting the combined torque requirements, buffering is provided by buffer blocks with different structures. On the one hand, it can prevent mistakes during installation and avoid installation errors. On the other hand, the different structural designs of the strong buffer section 601 and the weak buffer section 602 of different buffer blocks can also achieve greater adjustment and matching possibilities.

[0230] In some embodiments, 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 are shown in FIG. Figure 10 The second buffer block 63 includes a second arcuate 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 arcuate surface. During installation, the second buffer block 63 is positioned in the middle, and the two first buffer blocks are installed on either side of the second buffer block 63 with spacing. 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.

[0231] It should be noted that the "upper side" and "lower side" of the positions of the strong buffer segment 601 and the weak buffer segment 602 mentioned in the embodiment of the present invention refer to the upper and lower position relationship of the strong buffer segment 601 and the weak buffer segment 602 of the buffer block when the buffer block is assembled and the cover body is in a horizontal state.

[0232] 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, which makes the transition smoother and simplifies the processing technology.

[0233] According to an embodiment of the present invention, on the other hand, a container is provided, comprising:

[0234] Shell 2;

[0235] Opening and closing cover structure, the cover body 1 is hinged to the shell 2.

[0236] Since the container is provided with the opening and closing cover structure of the present application, it has the same technical effect as the opening and closing cover structure, and will not be described in detail here.

[0237] In some embodiments, as Figure 8 As shown, the housing 2 and the buffer block form a third arc surface at the joint, and the arc radius of the third arc surface is R x satisfy:

[0238] 22.5mm≤R x ≤23.5mm.

[0239] The third arc surface also takes the hinge point as its center.

[0240] The arc radius of the third arc surface is adapted to the arc radius of the first arc surface and the second arc surface on the buffer block, and the matching effect is good.

[0241] In some embodiments, the container is a cooking utensil.

[0242] Under the coordinated action of at least two buffer blocks, the buffer component 6 generates a larger buffer torque in the early and end stages of the lid opening stroke, and generates a smaller buffer torque in the middle stage of the lid opening stroke, so that the combined torque after adding the buffer component 6 tends to change smoothly during the entire process of opening the lid, and the lid opening speed tends to be uniform, thereby reducing the impact on the shell, preventing the pot from jumping, improving the reliability of the cooking appliance, and providing a good user experience.

[0243] A specific embodiment of the present invention further provides an electric rice cooker, comprising the opening and closing cover structure of the present invention.

[0244] Figure 13The following curves show how the elastic moment of the elastic element 4, the weight moment of the lid, and the resulting moment change with the lid opening angle (the angle is zero degrees when the lid is closed) when no buffer block is provided in the related art. The resulting moment acting on the lid has a nonlinear relationship with the opening angle, with significant variations in the resulting moment between the early and final stages of the opening stroke, resulting in a significant impact.

[0245] The housing 2 includes a support ring at its top, through which a hinge shaft 3 passes. The lid 1 is hingedly connected to the support ring to achieve a sealed fit within the accommodating chamber (cooking chamber) formed by the housing 2. The lid 1 comprises an inner cover and a decorative cover, with the inner cover located on the side of the lid 1 closest to the cooking chamber.

[0246] In this embodiment, if 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 members 4 , a reverse buffer block 61 and two forward buffer blocks 62 .

[0247] The hinge shaft passes through the corresponding holes on the inner cover and the support ring to form the basic structure of the opening and closing cover assembly; the two hinge springs are torsion springs, which are sleeved on the hinge shaft, one end of the hinge spring is limited by the support ring, and the other end is installed on the spring installation position 5 on the inner cover; the two positive buffer blocks 62 are respectively installed on the inner cover through their own flexible buckles, such as Figure 3 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 FIG. Figure 9 In this embodiment, only two first mounting positions are designed in the first card slot 11. In actual application, the actual demand for buffering force can be adjusted according to the elastic coefficient of the buffer block used and the opening and closing cover structure. The number n of the first mounting positions is n∈[1,4].

[0248] like Figure 7As shown, θ represents the angle between the conical surface 6031 of the elastic clip on the buffer block and its lower base. The reference value range is θ∈[30°, 60°]. If the angle θ is too small, the buffer block will be difficult to install, while if the angle θ is too large, the buffer block's axial size will be too large. A small flat section 1121 is designed on the guide surface 112 of the support ring that mates with the conical surface 6031 of the elastic clip. Its function is to reduce the possibility of sharp edges in the hole of the support ring at this location to avoid scratching the buffer block. δ represents the clearance between the flexible clip after the buffer block is installed. If the clearance is too large, the buffer block is not installed firmly and is prone to shaking. If the clearance is too small, the efficiency of the assembly process is affected. 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 figure, x represents the distance between the compressed surface 6011 and the pre-compression surface of the buffer block, i.e., the amount of buffer deformation. The pre-compression surface represents the position of the surface of the buffer block in contact with the support ring in a completely relaxed state, and the compressed surface 6011 represents the surface of the buffer block after being squeezed and deformed. The corresponding deformation x varies at different lid opening angles of the rice cooker, i.e.,

[0249]

[0250] The force analysis yields:

[0251]

[0252] By traversing different opening angles α (also known as angular displacements) within the integer domain, the corresponding x can be derived from the above formula, thereby determining the relationship between the uncompressed surface and the compressed surface 6011 of the buffer block. The reference value ranges of the hinge spring's elastic coefficient K1 and the buffer block's elastic coefficient K2 in this embodiment are K1∈[950N·mm / rad, 1050N·mm / rad] and K2∈[400N·mm / rad, 450N·mm / rad].

[0253] In this embodiment, the compressed surface 6011 can be approximately fitted into an arc surface with a radius 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 ​​of this example, resulting in the compressed surface 6011 being unable to be approximately fitted into an arc surface, then the compressed surface 6011 should be fitted using the above formula.

[0254] Depend on Figure 3 and Figure 4It can be seen 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 larger elastic deformation, thereby generating a larger elastic force, and vice versa. The present invention installs some buffer blocks in reverse so that the inner cover is simultaneously affected by the buffer force (elastic force) of the strong buffer section 601 and the buffer force (elastic force) of the weak buffer section 602 of the buffer block during the entire opening stroke. As the opening angle increases, the squeezed part of the reverse buffer block 61 turns from the weak buffer section 602 to the strong buffer section 601, and the elastic force generated gradually increases; the positive buffer block 62 is just the opposite, and its squeezed part turns from the strong buffer section 601 to the weak buffer section 602, and the elastic force generated gradually decreases, thereby making the change trend of the resultant torque acting on the inner cover tend to be gentle, thereby achieving the purpose of buffering.

[0255] Under the condition that it is known that the elastic torque generated by the pressure on the buffer block is in the opposite direction to the resultant torque on the lid, as long as the buffer block generates a larger torque at the beginning and end stages of the lid opening stroke and a smaller torque during the lid opening stroke, the resultant torque after adding the buffer block can be made to change more smoothly during the entire lid opening process.

[0256] Therefore, the compressed surface shape of the buffer block is restricted by the relationship between the buffer deformation x and the cover opening angle in the previous article, so that the elastic deformation of the buffer block gradually increases (positive direction) and vice versa (reverse direction) during the process of compressing the buffer block 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 cover opening process, while the elastic torque generated by the reverse buffer block 61 gradually decreases.

[0257] Controlling the resulting moment of the lid opening stroke to control the impact is related to 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 resulting moment of the lid opening stroke.

[0258] The present invention arranges some buffer blocks in reverse so that the change of the resultant torque applied to the cover body 1 during movement is always maintained at a relatively gentle state, thereby reducing the impact of the cover body 1 on the entire rice cooker during movement.

[0259] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this application.

Claims

1. An opening and closing cover structure, suitable for being arranged on a shell (2) of a container, characterized in that: include: The cover (1) has a hinge shaft (3); the cover (1) is suitable for being flipped and hinged to the housing (2) via the hinge shaft (3); An elastic member (4) is provided on the hinge shaft (3) and provides a driving force for opening the cover body (1); A buffer component (6) is mounted on the cover (1) and / or the housing (2), and is capable of frictionally contacting the housing (2) during the opening process of the cover (1), thereby providing a buffer force in the opposite direction to the elastic force of the elastic member (4); The buffer assembly (6) comprises at least two buffer blocks; the combined torque of the buffer assembly (6), the gravity torque of the cover body (1) and the elastic torque of the elastic member (4) remains constant or close to each other during the cover opening stroke.

2. The opening and closing cover structure according to claim 1, characterized in that: At least two of the buffer blocks include a first buffer block and a second buffer block; the force applied to the cover body (1) during the opening process satisfies the relationship: Where n2 is the number of the first buffer blocks, K2 is the elastic coefficient of the buffer blocks, and x α is the compression deformation of the first buffer block at different opening angles, α is the opening angle of the cover body (1), and α max is the maximum opening angle of the cover body (1), n1 is the number of the second buffer blocks, is the compression deformation of the second buffer block at different cover opening angles, K1 is the elastic coefficient of the elastic member (4), G is the gravity exerted on the cover body (1), and L is the distance from the center of gravity of the cover body (1) to the hinge axis (3).

3. The opening and closing cover structure according to claim 1 or 2, characterized in that: The buffer block comprises a strong buffer section (601) and a weak buffer section (602); during the lid opening process, the strong buffer section (601) and the weak buffer section (602) are in frictional contact with the housing (2) in a preset order.

4. The opening and closing cover structure according to claim 3, characterized in that: The strong buffer section (601) of a portion of the buffer blocks of the buffer assembly (6) is located at the lower side and the weak buffer section (602) is located at the upper side to form a positive buffer block (62), while the strong buffer section (601) of another portion of the buffer blocks is located at the upper side and the weak buffer section (602) is located at the lower side to form a negative buffer block (61).

5. The opening and closing cover structure according to claim 4, characterized in that: The buffer block includes: Buffer body; A buffer fitting portion is located on the squeezed side of the buffer body, and at least the buffer fitting portion of the buffer body is made of elastic material; the strong buffer section (601) and the weak buffer section (602) are formed in the buffer fitting portion; The mounting portion (603) is arranged on the non-extrusion side of the buffer body away from the buffer fitting portion.

6. The opening and closing cover structure according to claim 3, characterized in that: The strong buffer section (601) is connected to the weak buffer section (602), and the surface where the strong buffer section (601) is located forms an angle with the surface where the weak buffer section (602) is located.

7. The opening and closing cover structure according to claim 6, characterized in that: 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.

8. The opening and closing cover structure according to claim 7, characterized in that: The arc radius R0 of the first arc surface satisfies: 18mm≤R0≤19mm.

9. The opening and closing cover structure according to claim 5, characterized in that: The buffer block further comprises a neck portion (604), and the mounting portion (603) is connected to the buffer body via the neck portion (604).

10. The opening and closing cover structure according to claim 9, characterized in that: The angle β formed between the plane where the weak buffer section (602) is located and the parallel plane of the cross section of the neck (604) is 30°≤β≤40°.

11. The opening and closing cover structure according to claim 5, characterized in that: In a first direction of arranging the strong buffer section (601) and the weak buffer section (602), the mounting portion (603) is eccentrically arranged on the non-extrusion side.

12. The opening and closing cover structure according to claim 5, characterized in that: The mounting portion (603) comprises a frustum-shaped elastic buckle.

13. The opening and closing cover structure according to claim 12, characterized in that: The angle θ between the conical surface (6031) of the frustum-shaped elastic buckle and its upper bottom surface satisfies 30°≤θ≤60°.

14. The opening and closing cover structure according to claim 5, characterized in that: The cover (1) comprises: a first card slot (11), wherein at least one reverse buffer block (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 positive buffer block (62) is arranged in the second card slot.

15. The opening and closing cover structure according to claim 14, characterized in that: The first card slot (11) is provided with at least one first installation position, and the reverse buffer block (61) is detachably installed in the first installation position; And / or, the second card slot is provided with at least one second installation position, and the positive buffer block (62) is detachably installed in the second installation position.

16. The opening and closing cover structure according to claim 15, characterized in that: The first installation position includes: a first buckle accommodating cavity; a first engaging hole (111), wherein the mounting portion (603) of the reverse buffer block (61) passes through the first engaging hole (111) and is disposed in the first buckle accommodating cavity; And / or, the second installation location includes: a second buckle accommodating cavity; A second snap-fitting hole, through which the mounting portion (603) of the forward buffer block (62) passes and is disposed in the second snap-fitting accommodating cavity.

17. The opening and closing cover structure according to claim 16, characterized in that: The structure of the first buckle accommodating cavity and the structure of the second buckle accommodating cavity both match the structure of the mounting portion (603), and the first buckle accommodating cavity forms a first fitting gap near the first engaging hole (111), and the second buckle accommodating cavity forms a second fitting gap near the second engaging hole.

18. The opening and closing cover structure according to claim 17, characterized in that: A gap width δ1 of the first fitting gap satisfies 0.15 mm ≤ δ1 ≤ 0.3 mm; and / or a gap width δ2 of the second fitting gap satisfies 0.15 mm ≤ δ2 ≤ 0.3 mm.

19. The opening and closing cover structure according to claim 16, characterized in that: The first installation position also includes: A first guide surface is formed at the first installation position near the first engaging hole (111); And / or, the second installation location further includes: The second guide surface is formed at the second installation position close to the second engaging hole.

20. The opening and closing cover structure according to claim 19, characterized in that: The first guide surface comprises: a first inclined section; A first flat section is located near the outer wall of the first engaging hole (111); And / or, the second guide surface includes: a second inclined section; The second flat section is located near the outer wall of the second engaging hole.

21. The opening and closing cover structure according to claim 16, characterized in that: The center of the first engaging hole (111) is lower than the center of the second engaging hole.

22. The opening and closing cover structure according to claim 15, characterized in that: The first card slot (11) includes n first installation positions arranged side by side, where n is a positive integer and n∈[1,4].

23. The opening and closing cover structure according to claim 14, characterized in that: The first card slot (11) and the second card slot are both arranged on the cover body (1) near the hinge shaft (3); and at least two of the second card slots are distributed on both sides of the first card slot (11) along the axial direction of the hinge shaft (3).

24. The opening and closing cover structure according to claim 3, characterized in that: The buffer block further includes: The force reducing hole (605) is opened near the strong buffer section (601).

25. The opening and closing cover structure according to claim 2, characterized in that: All the buffer blocks have a strong buffer section (601) and a weak buffer section (602); 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 section (601) and the weak buffer section (602) of the first buffer block is opposite to the arrangement direction of the strong buffer section (601) and the weak buffer section (602) of the second buffer block (63).

26. The opening and closing cover structure according to claim 25, characterized in that: The second buffer block (63) comprises a second arc surface, and 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.

27. The opening and closing cover structure according to claim 26, characterized in that: The arc radius R1 of the second arc surface satisfies: 21mm≤R1≤22mm.

28. A container, characterized in that include: Housing (2); The opening and closing cover structure according to any one of claims 1 to 27, wherein the cover body (1) is hinged to the shell (2).

29. The container according to claim 28, characterized in that A third arc surface is formed at the joint between the housing (2) and the buffer block, and the arc radius R of the third arc surface is x satisfy: 22.5mm≤R x ≤23.5mm。 30. The container according to claim 28 or 29, characterized in that The container is a cooking utensil.

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