Food box sealing mechanism

Abstract

The utility model discloses a kind of food box sealing mechanisms, belong to food packaging container technical field.The utility model is used Technical scheme for a kind of food box sealing mechanism, including the box body with the opening of upper end and the box cover component for sealing the upper end opening of box body, box cover component inside is equipped with the annular mounting seat extending to the opening side of box body, several clamping grooves are arranged along the circumferential interval of mounting seat;Annular sealing ring, it is set in the outside of annular mounting seat, several connecting units are arranged in the circumferential interval of annular sealing ring inside, matched with clamping groove;The utility model is matched with the connecting unit of clamping groove by annular mounting seat, sealing ring accurate positioning and stable locking are realized, in combination with extension and box body inner wall adhere, integrated design and reinforcing rib structure, effectively solve the problem that sealing ring shifts, locking is insufficient and poor durability, with the advantages that prevent sealing ring shift and fall off, improve sealing locking stability, enhance the durability and sealing integrity of sealing ring.

Description

Technical Field

[0001] This utility model belongs to the field of food packaging container technology, and specifically relates to a food box sealing mechanism. Background Technology

[0002] In the storage and portability of non-sauce foods, the sealing performance of food containers directly affects the food's ability to prevent moisture, cross-contamination, and contamination, which is crucial for ensuring the freshness and taste of the food.

[0003] The sealing structures of mainstream food containers on the current market suffer from the following technical defects: First, the positioning and fixing of the sealing rings are problematic. Existing sealing rings are mostly connected to the lid by simply slipping or pasting them on, lacking a dedicated positioning and limiting structure, which makes the sealing rings prone to displacement and detachment during repeated opening and closing. Second, the sealing and locking performance is insufficient. Most products rely solely on simple pressing to achieve a seal, failing to create a stable sealing environment. Third, the adaptability to inclined opening structures is poor. Existing sealing structures cannot ensure a uniform fit between the sealing ring and the edge of the inclined opening. Finally, the durability and sealing integrity of the sealing rings are insufficient. The detachable design makes them prone to loss during cleaning, and there are gaps in the side walls.

[0004] These problems seriously affect the actual use of food boxes, and there is an urgent need for an innovative sealing solution that can simultaneously solve the problems of sealing ring positioning, locking performance, structural adaptability and durability. Utility Model Content

[0005] This utility model provides a food box sealing mechanism to solve at least one of the above-mentioned technical problems.

[0006] The technical solution adopted in this utility model is as follows: A food box sealing mechanism includes a box body with an opening at the top and a lid assembly for sealing the opening at the top of the box body. The lid assembly has an annular mounting seat extending toward the opening of the box body on its inner side, and a plurality of snap-fit ​​grooves are provided at intervals along the circumference of the mounting seat. An annular sealing ring is sleeved on the outer side of the annular mounting seat, and a plurality of connecting units that cooperate with the snap-fit ​​grooves are provided at intervals along the circumference of the inner side of the annular sealing ring.

[0007] Furthermore, this application also proposes that the snap-fit ​​groove includes a V-shaped guide groove and an O-shaped limiting groove, the end of the V-shaped guide groove is connected to the O-shaped limiting groove, and the connecting unit passes through the V-shaped guide groove in an interference fit manner to form a limiting and locking structure with the O-shaped limiting groove.

[0008] Furthermore, this application also proposes that the connecting unit includes a connecting shaft circumferentially disposed inside the annular sealing ring, and an anti-detachment protrusion is provided at the outer end of the connecting shaft, the diameter of which is larger than the diameter of the O-ring limiting groove.

[0009] Furthermore, this application also proposes that the outer side of the annular sealing ring has an extension that fits against the inner wall of the box.

[0010] Furthermore, this application also proposes that the annular sealing ring, connecting shaft, and anti-detachment protrusion be integrated into a single design.

[0011] Furthermore, this application also proposes that outwardly extending anti-detachment support plates are provided at the four corners of the upper edge of the mounting base.

[0012] Furthermore, this application also proposes that the mounting base has several reinforcing ribs arranged circumferentially on the inner side, and the reinforcing ribs are arranged on both sides of the snap-fit ​​groove.

[0013] Furthermore, this application also proposes that the lid assembly includes a lid plate, which is engaged with the upper end of the box body away from the retrieval side, and a closing plate is rotatably connected to the side of the lid plate near the retrieval side, with a mounting base disposed on the closing plate.

[0014] Furthermore, this application also proposes that the inner side of the cover plate is provided with a number of slots spaced apart circumferentially, the outer wall of the upper opening of the box body is provided with a number of snap-fit ​​flanges spaced apart circumferentially to cooperate with the slots, and the inner side of the cover plate is provided with a number of ribs, the ribs located at the edge position forming a connecting groove with the inner wall of the cover plate to engage with the edge of the upper opening of the box body.

[0015] Furthermore, this application also proposes that the upper opening of the box is inclined, the upper opening of the box is inclined towards the side of taking out the item, and the cover is symmetrically provided with locking ears on both sides, the locking ears are located on the side of the cover near the closing plate, and the upper opening of the box is symmetrically provided with locking blocks that cooperate with the locking ears.

[0016] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows: 1. This solution achieves multi-point positioning through a mechanical snap-fit ​​structure, solving the circumferential displacement problem. Conventional lid sealing surfaces are planar, while the extended structure of this solution's annular mounting base adapts to the geometry of the inclined opening. In existing technologies, the sealing ring and the box body have single-point contact; this solution's extension increases the lateral sealing area.

[0017] This application achieves reliable three-dimensional fixation of the sealing ring, preventing displacement accumulation caused by repeated opening and closing. The engagement of the snap-fit ​​groove and the connecting unit ensures that the sealing pressure is evenly distributed in the circumferential direction, eliminating the risk of localized seal failure. The extension fills the gap between the lid and the side wall of the box body, blocking the penetration path of external contaminants. The mounting base structure enhances the support rigidity of the sealing ring, preventing a decrease in sealing performance due to pressure deformation.

[0018] 2. This solution utilizes the synergistic effect of V-shaped guide grooves and O-shaped limiting grooves to achieve precise positioning during installation and create mechanical constraints during locking, preventing displacement of the sealing ring due to vibration or impact. This solves the problem of insufficient sealing and locking performance, ensuring uniform contact pressure between the sealing ring and the box opening. Even when the food box is subjected to external impact, it maintains the stability of the sealing interface, preventing moisture or contaminants from seeping in through gaps.

[0019] 3. This solution utilizes the interference fit between the anti-detachment protrusion and the limiting groove to create a physical barrier, maintaining connection stability even under vibration or temperature changes. This effectively prevents the sealing ring from circumferentially sliding or axially disengaging during long-term use, ensuring a consistently tight seal at the sealing interface. The mechanical locking characteristic of the anti-detachment protrusion avoids the glue aging and failure problems associated with traditional adhesive bonding methods, thus extending the service life of the sealing structure.

[0020] 4. This solution adds four corner anti-detachment support plates, which provide extra support to the sealing ring in the four corner areas where the stress is concentrated. This avoids sealing failure caused by local deformation, effectively suppresses the displacement trend of the sealing ring in the four corner areas, solves the problem of the sealing ring falling off due to insufficient local support, and enhances the uniformity of the fit between the sealing ring and the inner wall of the box, making the sealing pressure distribution more stable.

[0021] 5. This application significantly improves the fatigue resistance of the mounting base by setting reinforcing ribs on both sides of the snap-fit ​​groove, so that the snap-fit ​​groove can still maintain shape stability under dynamic load. It solves the problem of sealing ring connection failure caused by insufficient structural strength of the mounting base in existing sealing mechanisms. Through the supporting effect of the reinforcing ribs on the snap-fit ​​groove, it ensures that the sealing ring and the mounting base form a durable and reliable limit lock, and avoids the sealing pressure from decreasing due to structural deformation.

[0022] 6. This solution uses a rotating connection between a split cover and a closing plate to allow the sealing ring to adaptively adjust its contact angle as the closing plate moves. At the same time, the positioning function of the mounting base ensures a complete fit between the sealing ring and the inclined opening, solving the problem of poor sealing adaptability of inclined openings. This ensures that the sealing ring maintains a uniform fit during the opening and closing of the lid, avoiding unbalanced sealing pressure caused by the inclined opening. Furthermore, the split lid structure achieves a balance between rapid opening and closing on the retrieval side and sealing stability.

[0023] 7. This solution utilizes a multi-point circumferential fixing mechanism between the slot and the snap-fit ​​flange, combined with the connecting groove's wrapping around the box edge, ensuring the lid maintains even pressure on the sealing ring even when tilted, eliminating dead zones in the seal. Furthermore, the raised ribs enhance the lid's structural strength, preventing deformation due to uneven stress. This application solves the problem of poor fit between the lid and box body snap-fit ​​structure in tilted-opening food boxes, ensuring uniform contact of the sealing ring at the tilted opening edge and preventing moisture or dust infiltration due to uneven sealing pressure. Simultaneously, the connecting groove's wrapping around the box edge further restricts lid displacement, improving sealing stability. Attached Figure Description

[0024] Figure 1 This is an exploded view of the box cover assembly in this utility model; Figure 2 This is a top view of a specific embodiment of the present utility model; Figure 3 This utility model Figure 2 Schematic diagram of the cross-sectional structure along the AA direction; Figure 4 This is a schematic diagram of the structure of the box cover assembly in this utility model; Figure 5 This is a front view of the enclosed plate in this utility model; Figure 6 This is a schematic diagram of the annular sealing ring in this utility model; Figure 7 This is a structural schematic diagram of a specific embodiment of the present utility model; Figure 8 This utility model Figure 3 Enlarged view of section B; Figure 9 This utility model Figure 4 Enlarged view of section C; Figure 10 This utility model Figure 5 Enlarged view of section D in the middle; Figure 11 This utility model Figure 6 Enlarged view of section E in the middle.

[0025] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0026] In the attached diagram: 1. Box body; 2. Cover plate; 21. Slot; 22. Rib; 23. Snap-fit ​​ear; 3. Sealing plate; 31. Mounting base; 32. Snap-fit ​​groove; 321. V-shaped guide groove; 322. O-shaped limiting groove; 33. Reinforcing rib; 34. Anti-detachment support plate; 4. Annular sealing ring; 41. Connecting shaft; 42. Anti-detachment protrusion; 43. Extension. Detailed Implementation

[0027] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0029] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] In existing technologies, non-spicy food storage containers generally use a sealing method where the lid and body are directly pressed together. This type of structure relies on the friction between the sealing ring and the contact surface to maintain its position, and is prone to circumferential sliding or radial displacement of the sealing ring during frequent opening and closing. Food containers with slanted openings suffer from varying sealing surface angles, making it difficult for traditional sealing rings to evenly conform to the edge areas, leading to localized seal failure. Existing snap-fit ​​structures lack a limiting mechanism, resulting in uneven sealing pressure distribution, allowing external contaminants to easily seep into the container through gaps.

[0033] To address these issues, designers observed that seal ring displacement primarily stemmed from a lack of mechanical positioning structures, and that relying solely on elastic deformation could not provide sustained constraint. Analysis of the seal ring's force direction revealed that circumferentially spaced locking points effectively limited displacement. For the challenge of sealing angled openings, an extension structure was considered on the inner side of the lid assembly to accommodate contact surfaces at different angles. To resolve locking stability issues, a separate guide and limit design was adopted, ensuring an interference fit between the seal ring and the assembly process.

[0034] Therefore, this application proposes a box body 1 with an opening at the top and a box cover assembly for sealing the opening at the top of the box body 1. The inner side of the box cover assembly is provided with an annular mounting seat 31 extending toward the opening side of the box body 1, and a plurality of snap-fit ​​grooves 32 are provided circumferentially along the mounting seat 31. An annular sealing ring 4 is sleeved on the outer side of the annular mounting seat 31, and a plurality of connecting units that cooperate with the snap-fit ​​grooves 32 are provided circumferentially along the inner side of the annular sealing ring 4.

[0035] The annular mounting base 31 refers to a ring-shaped support structure extending downward from the inside of the cover assembly, which can be implemented using an injection-molded plastic flange. The snap-fit ​​groove 32 is a snap-fit ​​structure located circumferentially around the mounting base 31, which can be implemented using a combination of V-shaped and circular cross-sections. The V-shaped portion guides the connecting unit into place, while the circular portion provides circumferential restraint. The connecting unit is a connecting component protruding from the inside of the sealing ring, which can be implemented using a combination of a cylindrical connecting shaft 41 and a hemispherical protrusion. The diameter of the protrusion is larger than the end diameter of the snap-fit ​​groove 32 to prevent dislodgement.

[0036] Specifically, the annular mounting base 31 extends into the opening of the housing 1, forming radial support for the sealing ring. Snap-fit ​​grooves 32 are evenly distributed along the circumference of the mounting base 31, each groove including an inclined guide section and a circular locking section. During assembly, the connecting unit inside the sealing ring slides into the V-shaped guide groove 321. When the connecting shaft 41 reaches the O-ring limiting groove 322, the sealing ring undergoes elastic deformation, causing the anti-disengagement protrusion 42 to engage with the limiting groove. The space between the mounting base 31 and the inner wall of the housing 1 accommodates the sealing ring extension 43, forming a double sealing interface.

[0037] Compared to existing technologies, traditional sealing rings rely solely on friction for fixation. This solution utilizes a mechanical snap-fit ​​structure to achieve multi-point positioning, thus resolving the circumferential displacement problem. While conventional lid sealing surfaces are planar, the extended structure of the annular mounting base 31 in this solution adapts to the geometry of the inclined opening. In existing technologies, the sealing ring and the box body 1 have a single-point contact; this solution's extension 43 increases the lateral sealing area.

[0038] Through the above technical solution, this application achieves reliable fixation of the sealing ring in three dimensions, preventing displacement accumulation caused by repeated opening and closing. The engagement of the snap-fit ​​groove 32 with the connecting unit ensures that the sealing pressure is evenly distributed in the circumferential direction, eliminating the risk of local sealing failure. The extension 43 fills the gap between the lid and the side wall of the box body 1, blocking the penetration path of external contaminants. The structure of the mounting base 31 enhances the support rigidity of the sealing ring, avoiding a decrease in sealing performance caused by pressure deformation.

[0039] This application further proposes that the snap-fit ​​groove 32 includes a V-shaped guide groove 321 and an O-shaped limiting groove 322. The end of the V-shaped guide groove 321 is connected to the O-shaped limiting groove 322. The connecting unit passes through the V-shaped guide groove 321 in an interference fit manner and forms a limiting and locking structure with the O-shaped limiting groove 322.

[0040] The V-shaped guide groove 321 is a guide channel with a V-shaped cross-section. It can be implemented by symmetrically tilting the inner walls on both sides at a preset angle, used to guide the connecting unit along a specific path. The O-shaped limiting groove 322 is a limiting cavity with a circular cross-section. It can be implemented by a closed space formed by an arc-shaped inner wall, used to accommodate the end of the connecting unit and limit its displacement. The interference fit refers to the dimensional difference between the connecting unit and the guide groove. It can be implemented by making the outer diameter of the connecting unit slightly larger than the inner diameter of the guide groove, used to generate a clamping force between the contact surfaces. The limiting locking structure refers to the mechanical constraint formed by the connecting unit and the limiting groove. It can be implemented by embedding an anti-detachment protrusion 42 into the limiting groove, used to prevent the connecting unit from detaching in the opposite direction.

[0041] Specifically, during installation, the connecting unit is subjected to external force, causing it to slide along the inclined inner wall of the V-shaped guide groove 321. The symmetrical design of the inner walls on both sides automatically corrects the movement trajectory of the connecting unit. When the frictional resistance generated by the interference fit is overcome by the external force, the end of the connecting unit enters the O-shaped limiting groove 322. At this time, the anti-detachment protrusion 42 is completely wrapped by the arc-shaped inner wall of the limiting groove, forming a radial constraint. Due to the closed structure of the limiting groove, the connecting unit cannot retract along the original path, thus achieving one-way locking.

[0042] Compared with existing technologies, traditional sealing structures rely solely on the planar pressing of the cover and body 1, lacking both guiding and locking mechanisms. External impacts can easily cause the sealing ring to shift. This solution achieves precise positioning during installation and forms mechanical constraints during locking through the synergistic effect of the V-shaped guide groove 321 and the O-shaped limiting groove 322, preventing the sealing ring from shifting due to vibration or collision.

[0043] Through the above technical solution, this application solves the problem of insufficient sealing and locking performance, so that a uniform contact pressure is formed between the sealing ring and the opening of the box body 1, and the stability of the sealing interface can still be maintained when the food box is subjected to external impact, preventing moisture or contaminants from seeping in through the gap.

[0044] This application further proposes that the connecting unit includes a connecting shaft 41 circumferentially disposed inside the annular sealing ring 4, and an anti-detachment protrusion 42 is provided at the outer end of the connecting shaft 41, the diameter of the anti-detachment protrusion 42 being larger than the diameter of the O-ring limiting groove 322.

[0045] The connecting shaft 41 is a cylindrical body made of elastic material, with its axis aligned radially with the annular mounting base 31. The anti-detachment protrusion 42 can be implemented using a hemispherical or trapezoidal protrusion structure, with its diameter designed to be slightly larger than the inner diameter of the O-ring limiting groove 322. This structure undergoes elastic deformation under interference fit conditions, and returns to its original shape after entering the limiting groove, forming a mechanical lock.

[0046] The annular sealing ring 4 is initially installed by inserting the connecting shaft 41 into the snap-fit ​​groove 32 of the mounting base 31. When the connecting shaft 41 moves along the V-shaped guide groove 321 to the O-shaped limiting groove 322, the anti-detachment protrusion 42 is compressed and undergoes elastic deformation, returning to its original shape after fully entering the limiting groove. Since the diameter of the anti-detachment protrusion 42 is larger than the inner diameter of the limiting groove, a radial constraint is formed, preventing the connecting shaft 41 from detaching in the opposite direction. This structure limits the sealing ring in both the circumferential and radial directions, avoiding displacement of the sealing ring caused by repeated opening and closing of the cover.

[0047] Compared to existing technologies, traditional sealing rings rely solely on friction or adhesives for fixation, lacking a mechanical locking structure. This solution utilizes the interference fit between the anti-detachment protrusion 42 and the limiting groove to create a physical barrier, maintaining connection stability even under vibration or temperature changes. This effectively prevents circumferential sliding or axial detachment of the sealing ring during long-term use, ensuring a consistently tight seal. The mechanical locking characteristic of the anti-detachment protrusion 42 avoids the adhesive aging and failure problems associated with traditional bonding methods, extending the service life of the sealing structure.

[0048] This application further proposes that the outer side of the annular sealing ring 4 has an extension 43 that fits against the inner wall of the box body 1.

[0049] The extension 43 refers to an elastic structure extending outward from the outer side of the annular sealing ring 4. Specifically, it can be integrally molded from a flexible material of the same material as the main body of the annular sealing ring 4, and its radial extension length can be adapted to the curvature of the inner wall of the box body 1 of different specifications. When the box lid is closed, the extension 43 is compressed and deformed, forming a continuous pressing force on the inner wall of the box body 1.

[0050] Specifically, when the lid assembly is fastened to the opening of the box body 1, the extension 43 is compressed by the inner wall of the box body 1, resulting in elastic deformation. The rebound force generated by the deformation causes the outer surface of the extension 43 to form a surface contact with the inner wall of the box body 1. This contact surface is continuously distributed along the circumference of the opening of the box body 1, forming a secondary sealing barrier for the gap between the edge of the opening of the box body 1 and the lid assembly.

[0051] Compared with existing technologies, traditional sealing rings rely solely on the line contact between the main body of the annular sealing ring 4 and the upper edge of the opening of the box body 1 for sealing. However, the extension 43 increases the lateral sealing contact area, fills the lateral gap between the lid assembly and the inner wall of the box body 1, and blocks the path of external pollutants intruding along the side wall.

[0052] Through the above technical solution, this application effectively solves the problem of incomplete sealing caused by the gap between the side wall of the box body 1 and the lid assembly, preventing moisture or dust from entering the interior of the box body 1 from the side. The elastic fit design between the extension 43 and the inner wall of the box body 1 can maintain a stable sealing pressure during repeated opening and closing of the lid, improving the durability of the sealing structure.

[0053] This application further proposes that the annular sealing ring 4, the connecting shaft 41, and the anti-detachment protrusion 42 be designed as an integrated unit.

[0054] The annular sealing ring 4 is an annular elastic component fitted onto the outside of the annular mounting base 31, forming a sealing interface with the inner wall of the housing 1. It can be injection molded from silicone or rubber. The connecting shaft 41 on its inner side forms a mechanical connection with the locking groove 32. The connecting shaft 41 is a columnar extension structure circumferentially located inside the annular sealing ring 4, which can be a cylinder made of the same material as the annular sealing ring 4. An anti-detachment protrusion 42 at its outer end forms an interference fit with the O-ring limiting groove 322. The anti-detachment protrusion 42 is a raised structure with an increased diameter at the end of the connecting shaft 41, which can be spherical or mushroom-shaped, with a diameter larger than the inner diameter of the O-ring limiting groove 322 to achieve a locking function. The integrated design means that the annular sealing ring 4, connecting shaft 41, and anti-detachment protrusion 42 are integrally formed through injection molding, specifically using single-mold molding technology, eliminating assembly gaps in split structures.

[0055] Specifically, the connecting shaft 41 and the anti-detachment protrusion 42 on the inner side of the annular sealing ring 4 are formed simultaneously during the injection molding process, with no seam or connection interface between them. When the sealing ring is fitted onto the outer side of the annular mounting base 31, the connecting shaft 41 is inserted along the V-shaped guide groove 321 and finally embedded into the O-shaped limiting groove 322. The anti-detachment protrusion 42 cannot be pulled out in the reverse direction because its diameter is larger than that of the limiting groove. Since the sealing ring, connecting shaft 41, and anti-detachment protrusion 42 are an integral structure, the parts will not separate during repeated opening and closing of the lid, and will not be lost due to disassembly during cleaning.

[0056] Compared to existing technologies, traditional sealing rings use separate assembly for their connecting components, such as adhesive bonding or snap-fit ​​assembly, which is prone to connection failure due to material aging or mechanical stress. This solution eliminates the weak points of separate assembly through an integrated structure, avoiding the risk of the connecting shaft 41 detaching from the sealing ring.

[0057] Through the above technical solution, this application solves the problem of easy detachment and loss of split sealing ring components, enhances the overall mechanical strength of the sealing structure, ensures that the sealing ring maintains stable sealing pressure during long-term use, reduces the probability of component loss during cleaning and maintenance, and extends the service life of the sealing mechanism.

[0058] This application further proposes that the four corners of the mounting base 31 are provided with outwardly extending anti-detachment support plates 34.

[0059] The anti-detachment support plate 34 is a plate-like structure extending outward from the four corners of the mounting base 31. It can be integrally manufactured with the mounting base 31 using injection molding. Its extension direction forms an angle with the axis of the mounting base 31, and it is used to apply radial support force to the annular sealing ring 4. The four corner positions refer to the four corner points distributed circumferentially around the mounting base 31. Specifically, they can be located near the contact points between the mounting base 31 and the opening edge of the housing 1, providing multi-point support when the sealing ring is under force, preventing the sealing ring from shifting due to uneven local force.

[0060] Specifically, the anti-detachment support plate 34 extends outward from the four corners of the mounting base 31, and its outer surface forms a contact surface with the inner wall of the annular sealing ring 4. When the lid is closed, the sealing ring is compressed by the inner wall of the box body 1, resulting in radial deformation. At this time, the anti-detachment support plate 34 applies a reverse support force to the sealing ring through the four corner support points, keeping the sealing ring in a uniformly compressed state in the circumferential direction. At the same time, the outwardly extending end of the anti-detachment support plate 34 forms a limiting structure. When the sealing ring undergoes axial displacement due to external force, the end of the support plate can prevent the sealing ring from detaching from the mounting base 31.

[0061] Compared with existing technologies, the mounting base 31 in traditional sealing mechanisms lacks support structures for the four corner areas of the sealing ring, causing the sealing ring to easily warp or detach from the four corners during repeated opening and closing. This solution adds anti-detachment support plates 34 at the four corners, providing extra support for the sealing ring in the stress-concentrated areas, preventing sealing failure due to local deformation, effectively suppressing the displacement tendency of the sealing ring in the four corner areas, solving the problem of detachment caused by insufficient local support, and enhancing the uniformity of the fit between the sealing ring and the inner wall of the housing 1, making the sealing pressure distribution more stable.

[0062] This application further proposes that the mounting base 31 has a plurality of reinforcing ribs 33 arranged in the inner circumferential direction, and the reinforcing ribs 33 are arranged on both sides of the snap-fit ​​groove 32.

[0063] The reinforcing rib 33 is a strip-shaped protrusion distributed along the inner circumference of the mounting base 31. It can be implemented in the form of a rib plate. It is set on both sides of the snap-fit ​​groove 32 to improve the overall structural strength of the mounting base 31 and prevent the snap-fit ​​groove 32 from deforming due to force during the assembly or use of the sealing ring.

[0064] The reinforcing ribs 33 distributed circumferentially on the inner side of the mounting base 31 are symmetrically arranged on both sides of the snap-fit ​​groove 32, forming a clamping support for the snap-fit ​​groove 32. When the connecting unit of the sealing ring slides into the O-ring limiting groove 322 along the V-shaped guide groove 321, the reinforcing ribs 33 on both sides of the snap-fit ​​groove 32 can effectively disperse the radial pressure applied by the connecting unit, avoiding plastic deformation caused by stress concentration in local areas of the mounting base 31. During the repeated opening and closing of the cover, the reinforcing ribs 33 continuously maintain the geometric accuracy of the snap-fit ​​groove 32, ensuring a stable fit clearance between the connecting unit and the limiting groove.

[0065] Compared with existing technologies, traditional sealing mechanisms lack reinforcing ribs 33 in the mounting base 31, making the locking groove 32 prone to wall expansion or bottom cracking during long-term use, leading to displacement or detachment of the sealing ring connection unit. This application significantly improves the fatigue resistance of the mounting base 31 by providing reinforcing ribs 33 on both sides of the locking groove 32, ensuring the locking groove 32 maintains shape stability under dynamic loads. This solves the problem of sealing ring connection failure caused by insufficient structural strength of the mounting base 31 in existing sealing mechanisms. The supporting effect of the reinforcing ribs 33 on the locking groove 32 ensures a durable and reliable locking mechanism between the sealing ring and the mounting base 31, preventing the sealing pressure from decreasing due to structural deformation.

[0066] This application further proposes a box cover assembly including a cover plate 2, which is engaged with the upper end of the box body 1 away from the side where the item is taken out. A sealing plate 3 is rotatably connected to the side of the cover plate 2 near the side where the item is taken out, and a mounting base 31 is disposed on the sealing plate 3.

[0067] The cover plate 2 is a plate-like structure that covers the opening of the box body 1. It can be made of injection-molded plastic, and its edges engage with the edge of the opening of the box body 1 to initially secure the cover assembly. The closing plate 3 is a plate-like structure rotatably connected to the cover plate 2. It can be implemented using a hinge or flexible connector to form an openable and closable sealing surface on the item retrieval side. The mounting base 31 is an annular protrusion structure located inside the closing plate 3. It can be implemented using an annular step integrally molded with the closing plate 3 to support the sealing ring and guide its engagement with the opening of the box body 1.

[0068] Specifically, the cover plate 2 is fixedly connected to the snap-fit ​​blocks on both sides of the opening at the upper end of the box body 1 via the snap-fit ​​ears 23, keeping the end of the cover plate 2 away from the retrieval side stable; the closing plate 3 achieves flexible opening and closing of the retrieval side through a rotating connection structure, and the mounting base 31 adjusts its position as the closing plate 3 rotates, ensuring that the sealing ring fitted on the mounting base 31 always maintains uniform contact with the inner wall of the inclined opening of the box body 1. When the closing plate 3 is closed, the mounting base 31 drives the sealing ring to apply pressure along the inclined direction of the opening of the box body 1, preventing the sealing ring from partially dislodging due to the inclination of the opening.

[0069] Compared with existing technologies, traditional box lid assemblies use a single cover plate 2 to directly press the inclined opening, and the sealing ring is prone to gaps due to uneven force. However, this solution uses a rotating connection between the split cover plate 2 and the closing plate 3, so that the sealing ring adaptively adjusts the contact angle as the closing plate 3 moves. At the same time, the positioning function of the mounting base 31 ensures that the sealing ring and the inclined opening are completely fitted, which solves the problem of poor sealing adaptability of the inclined opening. This ensures that the sealing ring maintains a uniform fit during the opening and closing of the box lid, avoiding the imbalance of sealing pressure caused by the inclined opening. In addition, the split box lid structure achieves a balance between rapid opening and closing on the retrieval side and sealing stability.

[0070] This application further proposes that the inner side of the cover plate 2 is provided with a plurality of slots 21 spaced apart, the outer wall of the upper opening of the box body 1 is provided with a plurality of snap-fit ​​flanges spaced apart, which cooperate with the slots 21, and the inner side of the cover plate 2 is provided with a plurality of ribs 22, the ribs 22 located at the edge position and the inner wall of the cover plate 2 form a connecting groove that engages with the edge of the upper opening of the box body 1.

[0071] The slot 21 is a recessed structure circumferentially spaced on the inner side of the cover plate 2, which can be rectangular or trapezoidal grooves. It is used to form a snap-fit ​​with the snap-fit ​​flange on the outer wall of the box body 1, restricting the relative displacement between the cover plate 2 and the box body 1. The snap-fit ​​flange is a protruding structure circumferentially spaced on the outer wall of the upper opening of the box body 1, which can be trapezoidal or arc-shaped protrusions that match the shape of the slot 21. It is embedded in the slot 21 to achieve a fixed connection between the cover plate 2 and the box body 1. The rib 22 is a strip-shaped protrusion on the inner side of the cover plate 2, which can be a strip-shaped protrusion parallel to the edge of the cover plate 2. The rib 22 located at the edge forms a connecting groove with the inner wall of the cover plate 2 to accommodate the edge of the upper opening of the box body 1, enhancing the fixing effect between the cover plate 2 and the box body 1. The connecting groove is a groove-shaped space formed by the protruding ribs 22 at the edge and the inner wall of the cover plate 2. Specifically, it can be implemented using a U-shaped or L-shaped groove structure. By embedding the edge of the opening at the upper end of the box body 1 into the groove, a tight fit between the cover plate 2 and the box body 1 can be achieved.

[0072] Specifically, multiple slots 21 are provided circumferentially on the inner side of the cover plate 2, and a corresponding snap-fit ​​flange is provided on the outer wall of the upper opening of the box body 1. When the cover plate 2 is fastened onto the box body 1, the snap-fit ​​flange is embedded in the slots 21, forming a preliminary fixation. At the same time, the ribs 22 on the inner side of the cover plate 2 are distributed circumferentially, and the ribs 22 at the edge positions form a connecting groove with the inner wall of the cover plate 2. The edge of the upper opening of the box body 1 is embedded in the connecting groove, further restricting the relative displacement between the cover plate 2 and the box body 1. Through the cooperation of the slots 21 and the snap-fit ​​flange, and the wrapping of the connecting groove around the edge of the box body 1, it is ensured that the cover plate 2 can still apply sealing pressure evenly when the opening is tilted, avoiding poor local fitting of the sealing ring caused by the tilt of the opening of the box body 1.

[0073] Compared with existing technologies, the lid 2 and box body 1 of existing food boxes mostly adopt a single snap-fit ​​structure, which cannot adapt to the sealing requirements of inclined openings and is prone to uneven distribution of sealing pressure. This solution uses the slot 21 and the snap-fit ​​flange for circumferential multi-point fixation, combined with the connecting groove wrapping the edge of the box body 1, so that the lid 2 can still evenly press the sealing ring in the inclined state, eliminating sealing dead corners. In addition, the setting of the rib 22 enhances the structural strength of the lid 2 and avoids deformation caused by uneven force. This application solves the problem of poor compatibility of the snap-fit ​​structure between the lid 2 and the box body 1 in inclined opening food boxes, ensuring that the sealing ring fits evenly at the edge of the inclined opening and preventing moisture or dust from seeping in due to uneven sealing pressure. At the same time, the wrapping of the box body 1 by the connecting groove further restricts the displacement of the lid 2 and improves the sealing stability.

[0074] This application further proposes a food box sealing mechanism, wherein the upper opening of the box body 1 is inclined and the upper opening of the box body 1 is inclined towards the side for taking out the object, and the cover plate 2 is symmetrically provided with locking ears 23 on both sides, the locking ears 23 being located on the side of the cover plate 2 close to the sealing plate 3, and the upper opening of the box body 1 is symmetrically provided with locking blocks that cooperate with the locking ears 23.

[0075] The inclined opening at the top of box 1 refers to a non-perpendicular angle between the opening plane and the bottom surface of box 1. For example, the opening plane can be inclined from 15° to 45°. This can be achieved by adjusting the mold angle during injection molding. The inclined opening facilitates one-handed access for the user. The latching lugs 23 are protruding structures extending from both sides of the cover plate 2. For example, the latching lugs 23 can be designed as L-shaped or T-shaped. They can be integrally injection molded with the cover plate 2 and are used to position and engage with the latching blocks of box 1. The latching blocks are recessed or protruding structures located on both sides of the opening of box 1. For example, the latching blocks can be designed as grooves complementary to the shape of the latching lugs 23. This can be achieved by pre-reserving slots during the injection molding of box 1 and is used to restrict the movement direction of the latching lugs 23.

[0076] Specifically, when the cover 2 is closed, the locking ears 23 are embedded in the locking blocks on both sides of the box body 1. The complementary shapes of the locking ears 23 and the locking blocks restrict the displacement of the cover 2 in the inclined opening direction. The locking ears 23 and locking blocks of the inclined opening of the box body 1 cooperate with the cover 2 to apply uniform pressure in the inclined direction when the cover 2 is closed, ensuring that the annular sealing ring 4 fits tightly against the edge of the opening of the box body 1. The symmetrical distribution of the locking ears 23 and locking blocks can balance the force on the cover 2 and avoid the sealing ring from partially dislodging due to uneven force on one side.

[0077] Compared to existing technologies, traditional food boxes typically have horizontally designed openings, and the snap-fit ​​structure of the lid 2 is not adapted for inclined openings, resulting in uneven pressure distribution between the sealing ring and the opening edge. This solution addresses this by directionally engaging the inclined opening with the snap-fit ​​ear 23 and the snap-fit ​​block, ensuring that the sealing pressure direction aligns with the opening's inclination direction, thus eliminating sealing gaps caused by the opening angle.

[0078] Through the above technical solution, this application solves the problem of uneven sealing pressure distribution in tilted opening food boxes, ensuring that the sealing ring fits evenly in the circumferential direction at the edge of the tilted opening, while maintaining the closing stability of the cover plate 2 through the directional snap-fit ​​structure, thus taking into account both the convenience of taking out items and the reliability of sealing.

[0079] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0080] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0081] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A food box sealing mechanism, comprising a box body (1) with an opening at its upper end and a lid assembly for sealing the opening at the upper end of the box body (1), characterized in that, The inner side of the box cover assembly is provided with an annular mounting seat (31) extending toward the opening side of the box body (1), and a number of snap-fit ​​grooves (32) are provided circumferentially along the mounting seat (31). An annular sealing ring (4) is fitted on the outside of the annular mounting base (31), and the inner side of the annular sealing ring (4) is provided with a plurality of connecting units that cooperate with the snap-fit ​​groove (32) at circumferential intervals.

2. The food box sealing mechanism according to claim 1, characterized in that, The snap-fit ​​groove (32) includes a V-shaped guide groove (321) and an O-shaped limiting groove (322). The end of the V-shaped guide groove (321) is connected to the O-shaped limiting groove (322). The connecting unit passes through the V-shaped guide groove (321) in an interference fit manner and forms a limiting locking structure with the O-shaped limiting groove (322).

3. The food box sealing mechanism according to claim 2, characterized in that, The connecting unit includes a connecting shaft (41) circumferentially disposed inside the annular sealing ring (4), and an anti-detachment protrusion (42) is provided at the outer end of the connecting shaft (41). The diameter of the anti-detachment protrusion (42) is larger than the diameter of the O-shaped limiting groove (322).

4. A food box sealing mechanism according to claim 3, characterized in that, The annular sealing ring (4) has an extension (43) on its outer side that fits against the inner wall of the box (1).

5. A food box sealing mechanism according to claim 4, characterized in that, The annular sealing ring (4), connecting shaft (41), anti-detachment protrusion (42), and extension (43) are designed as a single unit.

6. A food box sealing mechanism according to claim 1, characterized in that, The mounting base (31) has outwardly extending anti-detachment support plates (34) at the four corners of its upper edge.

7. A food box sealing mechanism according to claim 1, characterized in that, The mounting base (31) is provided with several reinforcing ribs (33) on its inner circumferential side, and the reinforcing ribs (33) are provided on both sides of the snap-fit ​​groove (32).

8. A food box sealing mechanism according to claim 1, characterized in that, The box cover assembly includes a cover plate (2), which is engaged with the upper end of the box body (1) away from the side where the object is taken out. A sealing plate (3) is rotatably connected to the side of the cover plate (2) near the side where the object is taken out. The mounting base (31) is set on the sealing plate (3).

9. A food box sealing mechanism according to claim 8, characterized in that, The inner side of the cover plate (2) is provided with a number of slots (21) spaced apart. The outer wall of the upper opening of the box body (1) is provided with a number of snap-fit ​​flanges that cooperate with the slots (21) spaced apart. The inner side of the cover plate (2) is provided with a number of ribs (22). The ribs (22) located at the edge position form a connecting groove with the inner wall of the cover plate (2) and engage with the edge of the upper opening of the box body (1).

10. A food box sealing mechanism according to claim 9, characterized in that, The upper opening of the box body (1) is inclined and the upper opening of the box body (1) is inclined towards the side of taking out the object. The cover plate (2) is symmetrically provided with snap-fit ​​ears (23) on both sides. The snap-fit ​​ears (23) are located on the side of the cover plate (2) close to the closing plate (3). The upper opening of the box body (1) is symmetrically provided with snap-fit ​​blocks that cooperate with the snap-fit ​​ears (23).

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