Plastic box with sealing structure

Abstract

The utility model discloses a plastic box with sealing structure, including the box body with upper opening and the cover plate of cover is placed in the upper opening of box body, its characterized in that: the cover plate downside is equipped with the positioning convex part along its edge contour, the positioning convex part with opening of box body is adapted, the positioning convex part is recessed with the sealing groove along the circumference, is equipped with the first sealing ring in the sealing groove can with the side wall of box body inner chamber abuts, the recessed groove is recessed in the positioning convex part upside, is equipped with a plurality of groove holes that can be communicated with the sealing groove in the recessed groove interval along the circumference, can be pressed in each groove hole respectively and is set up the inside top pressure piece of first sealing ring in the movable setting, is equipped with the connecting member in the recessed groove can make the top pressure piece keep the top pressure state.

Description

Technical Field

[0001] This utility model specifically relates to a plastic box with a sealing structure. Background Technology

[0002] Plastic boxes are widely used in industrial packaging, food storage, and the transportation of precision components due to their low cost, lightweight, and ease of molding. However, the sealing performance of existing plastic boxes often fails to meet the demands of high-requirement applications. Traditional plastic boxes typically achieve sealing only by adhering the edges of the box body and lid. Due to the thermal expansion and contraction properties of plastic materials, gaps easily appear at the edges after prolonged use. Furthermore, the simple positioning structure of the lid and box body makes them prone to misalignment during the closing process, leading to uneven stress on the sealing surface and further exacerbating sealing failure.

[0003] In humid environments or scenarios requiring the isolation of liquids and gases, such sealing defects can lead to moisture absorption, contamination, or leakage of the contents. This is especially problematic for environmentally sensitive items such as electronic components and precision instruments, where seal failure can directly damage the product and result in economic losses. Furthermore, some existing plastic boxes with sealing structures use fixed sealing mechanisms, making it impossible to adjust the sealing force according to actual usage needs. As the seals age, it becomes difficult to maintain sealing performance through adjustment, leading to a shortened overall lifespan of the plastic box. Utility Model Content

[0004] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a plastic box with a sealing structure.

[0005] A plastic box with a sealing structure includes a box body with an upper opening and a cover plate placed on the upper opening of the box body. The lower side of the cover plate has a positioning protrusion along its edge contour, the positioning protrusion being adapted to the opening of the box body. The positioning protrusion has a sealing groove recessed along its circumference, and a first sealing ring is provided in the sealing groove, which can abut against the inner wall of the box body. The upper side of the positioning protrusion has a groove recessed, and a plurality of slots that can communicate with the sealing groove are provided in the groove at intervals along its circumference. A pressing member that can press against the inner side of the first sealing ring is movably disposed in each slot. A connecting member that can keep the pressing member in a pressing state is provided in the groove.

[0006] In one embodiment, each of the four sides of the groove is rotatably provided with a flap, which can rotate to drive the top pressure member to move.

[0007] In one embodiment, the top pressing member is a pressing block, which is integrally formed with the flip plate.

[0008] In one embodiment, the connecting member includes a connecting plate and a clamping member. The connecting plate is adapted to move up and down in the groove. A limiting flange extends from the lower side of the connecting plate and can press against the flip plate to cause the flip plate to flip. The clamping member is connected to the cover plate and presses against the connecting plate so that the limiting flange is kept in a tight contact with the flip plate.

[0009] In one embodiment, the clamping element is a fastening screw that passes through the connecting plate and is threadedly connected to the cover plate.

[0010] In one embodiment, a screw hole is provided on the bottom side of the groove, and a recessed groove is provided on the upper side of the connecting plate. A through hole is provided on the recessed groove corresponding to the screw hole. The clamping member passes through the through hole and is threadedly connected to the screw hole, so that the clamping member is pressed onto the connecting plate along the thread.

[0011] In one embodiment, a second sealing ring abuts between the connecting plate and the groove.

[0012] In summary, the advantages of this utility model over the prior art are:

[0013] This utility model achieves precise positioning of the cover plate and the box body by setting a positioning protrusion on the lower side of the cover plate that matches the opening of the box body, avoiding misalignment of the sealing surface caused by offset when the cover is closed, thus ensuring the stability of the sealing base from a structural perspective. In addition, a first sealing ring is set in the sealing groove on the positioning protrusion. When the cover plate is closed on the box body, the first sealing ring can directly abut against the inner cavity side wall of the box body to form an initial seal.

[0014] A movable top-pressing component is installed through a slot in the groove, and the connecting component keeps the top-pressing component pressing against the inside of the first sealing ring, allowing for active adjustment of the compression of the first sealing ring. This design not only enhances the sealing effect by increasing the contact pressure between the first sealing ring and the inner wall of the box cavity, but also compensates for the sealing performance by applying secondary pressure through the top-pressing component when the elasticity of the first sealing ring decreases due to aging, thus extending the service life of the plastic box. At the same time, the top-pressing components are spaced along the circumference, which ensures that the force is evenly distributed across all parts of the first sealing ring, avoiding local sealing failure and significantly improving the sealing reliability of the plastic box. This meets the usage requirements of complex environments such as humid, dusty, and gas-barrier environments. Attached Figure Description

[0015] Figure 1 This is one of the exploded views of a plastic box with a sealing structure according to one embodiment of the present invention;

[0016] Figure 2 As one embodiment of this utility model Figure 1 Enlarged view of point A;

[0017] Figure 3This is a second exploded view of a plastic box with a sealing structure according to one embodiment of the present invention;

[0018] Figure 4 This is a perspective view of a plastic box with a sealing structure according to one embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] like Figures 1 to 4 The present invention preferably provides a plastic box with a sealing structure, including a box body 1 with an upper opening and a cover plate 2 that covers the upper opening of the box body 1. The cover plate 2 has a positioning protrusion 3 along its edge contour on its lower side. The positioning protrusion 3 is adapted to the opening of the box body 1. The positioning protrusion 3 has a sealing groove 4 recessed in its circumference. The sealing groove 4 is provided with a first sealing ring 5 that can abut against the inner wall of the box body 1. The positioning protrusion 3 has a groove 6 recessed in its upper side. The groove 6 is provided with a plurality of slot holes 7 that can communicate with the sealing groove 4 at intervals along its circumference. A pressing member 8 that can press against the inner side of the first sealing ring 5 is movably arranged in each slot hole 7. A connecting member 9 that can keep the pressing member 8 in a pressing state is provided in the groove 6.

[0021] Specifically, by setting a positioning protrusion on the underside of the cover plate that matches the opening of the box, precise positioning of the cover plate and the box body is achieved, avoiding misalignment of the sealing surface caused by offset when closing. This structurally ensures the stability of the sealing base. Furthermore, a first sealing ring is installed in the sealing groove on the positioning protrusion. When the cover plate is closed on the box body, the first sealing ring can directly abut against the inner wall of the box cavity, forming an initial seal. When the cover plate is closed, the positioning protrusion is embedded into the box opening for positioning, and the first sealing ring in the sealing groove initially adheres to the inner wall of the box cavity. The pressing component in the groove acts on the inner side of the first sealing ring through the slot hole. Under the action of the connecting component, the pressing component maintains a pressing state, causing the first sealing ring to deform and tightly adhere to the inner wall of the box cavity, forming an effective seal.

[0022] In summary, by using a movable top-pressing component installed in the groove and a connecting member to maintain the top-pressing component pressing against the inner side of the first sealing ring, the compression of the first sealing ring can be actively adjusted. This design not only enhances the sealing effect by increasing the contact pressure between the first sealing ring and the inner wall of the box cavity, but also compensates for the sealing performance by applying secondary pressure through the top-pressing component when the elasticity of the first sealing ring decreases due to aging, thus extending the service life of the plastic box. At the same time, the top-pressing components are spaced along the circumference, which ensures that the force is evenly distributed across all parts of the first sealing ring, avoiding local sealing failure and significantly improving the sealing reliability of the plastic box. This design can meet the usage requirements of complex environments such as humid, dusty, and gas-barrier environments.

[0023] In one embodiment, further, as Figure 2 As shown, each of the four sides of the groove 6 is rotatably equipped with a flap 10, which can rotate to drive the top pressing member 8 to move. The top pressing member 8 is a pressing block, which is integrally formed with the flap 10. The connecting member 9 includes a connecting plate 11 and a clamping member 12. The connecting plate 11 is adapted to be movably mounted in the groove 6. The lower side of the connecting plate 11 extends a limiting flange 13 that can press against the flap 10 to cause the flap 10 to flip. The clamping member 12 is connected to the cover plate 2 and is pressed tightly against the connecting plate 11 so that the limiting flange 13 is kept in a tight abutment with the flap 10.

[0024] Specifically, the flaps are rotatably mounted on all four sides of the groove. When the flaps rotate towards the groove, their ends push the pressing member along the groove towards the sealing groove, thereby pressing the first sealing ring. When the flaps rotate in the opposite direction, the pressing member loses its thrust, and the first sealing ring elastically resets. The pressing member and the flaps are integrally formed. When the flaps rotate around the rotating axis, the pressing member moves synchronously with the flaps, directly applying pressure to the first sealing ring, reducing the assembly gap of the split structure and improving the stability of the pressing action. The connecting plate moves up and down in the groove. When the limiting flange on its lower side moves down with the connecting plate, it presses against the flaps, causing them to flip, and then the pressing member presses the first sealing ring tightly. The clamping member presses the connecting plate tightly into the groove, keeping the limiting flange in a pressing state against the flaps, maintaining the sealing pressure.

[0025] In another embodiment, further, as Figure 3 The connecting member 9 shown includes a connecting plate 11 and a clamping member 12. The connecting plate 11 is adapted to move up and down in the groove 6. A limiting flange 13 extends from the lower side of the connecting plate 11. The side of the limiting flange near the pressing member is a first inclined surface, and the end of the pressing member located in the groove is a second inclined surface. The pressing member is displaced to abut against the sealing ring by the first inclined surface and the second inclined surface abutting against each other and by the transmission drive when the connecting plate moves downward.

[0026] Specifically, when a seal is required, the cover plate 2 is placed on the box body 1, so that the positioning protrusion 3 is embedded in the opening of the box body 1. At this time, the first sealing ring 5 initially contacts the inner cavity sidewall of the box body 1. Subsequently, the clamping member 12 is tightened, and under the action of the thread driving force, the connecting plate 11 slides downward along the groove 6, and the limiting flange 13 moves downward synchronously with the connecting plate 11. Since the first inclined surface of the limiting flange 13 and the second inclined surface of the pressing member 8 are in contact with each other, the downward displacement of the connecting plate 11 is converted into the horizontal displacement of the pressing member 8 along the axial direction of the slot 7 towards the sealing groove 4 through the transmission of the inclined surface. During the displacement process, the pressing member 8 gradually presses against the inner side of the first sealing ring 5, causing the first sealing ring 5 to undergo elastic deformation and tightly fit against the inner cavity sidewall of the box body 1, ultimately forming a reliable seal. When the plastic box needs to be opened, the tightening member 12 is rotated in the opposite direction. Under the elastic reaction force of the first sealing ring 5 and the thrust of the top pressing member 8, the connecting plate 11 is reset upward. The limiting flange 13 is disengaged from the top pressing member 8. Under the rebound action of the first sealing ring 5, the top pressing member 8 is retracted into the slot 7, and the sealing state is released.

[0027] Furthermore, the clamping member 12 is a fastening screw, which passes through the connecting plate 11 and is threadedly connected to the cover plate 2. Specifically, after the fastening screw passes through the connecting plate, it is threadedly connected to the cover plate. When the fastening screw is tightened, the axial force of the screw presses the connecting plate downward, so that the limiting flange presses against the flip plate and keeps it in a flipped state; when the screw is loosened, the connecting plate can move upward, relieving the pressure on the flip plate.

[0028] Furthermore, a screw hole 14 is provided on the bottom side of the groove 6, and a recessed groove 15 is provided on the upper side of the connecting plate 11. A through hole is provided on the recessed groove 15 corresponding to the screw hole 14. The clamping member 12 passes through the through hole and is threadedly connected to the screw hole 14, so that the clamping member 12 is pressed onto the connecting plate 11 along the thread. Specifically, after the clamping member passes through the through hole of the connecting plate, it is threadedly connected to the screw hole on the bottom side of the groove. When the clamping member is tightened, its head moves downward along the thread and is pressed into the recessed groove of the connecting plate, causing the connecting plate to move downward so that the limiting flange presses against the flip plate; when the clamping member is loosened in the opposite direction, the pressure is released and the connecting plate can be lifted.

[0029] Furthermore, a second sealing ring abuts between the connecting plate 11 and the groove 6.

[0030] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic box with a sealing structure, comprising a box body (1) having an upper opening and a cover plate (2) covering the upper opening of the box body (1), characterized in that: The cover plate (2) has a positioning protrusion (3) along its edge contour on the lower side. The positioning protrusion (3) is adapted to the opening of the box body (1). The positioning protrusion (3) has a sealing groove (4) recessed along the circumference. The sealing groove (4) is provided with a first sealing ring (5) that can abut against the inner wall of the box body (1). The positioning protrusion (3) has a groove (6) recessed on the upper side. The groove (6) is provided with a number of slots (7) that can communicate with the sealing groove (4) at intervals along the circumference. Each slot (7) is provided with a pressing member (8) that can press against the inner side of the first sealing ring (5). The groove (6) is provided with a connecting member (9) that can keep the pressing member (8) in a pressing state.

2. A plastic box with a sealing structure according to claim 1, characterized in that: Each of the four sides of the groove (6) is provided with a flap (10) that can rotate to drive the top pressure member (8) to move.

3. A plastic box with a sealing structure according to claim 2, characterized in that: The top pressing component (8) is a pressing block, which is integrally formed with the flip plate (10).

4. A plastic box with a sealing structure according to claim 2, characterized in that: The connecting member (9) includes a connecting plate (11) and a clamping member (12). The connecting plate (11) is adapted to move up and down in the groove (6). The lower side of the connecting plate (11) extends a limiting flange (13) that can press against the flip plate (10) to cause the flip plate (10) to flip. The clamping member (12) is connected to the cover plate (2) and pressed tightly on the connecting plate (11) so that the limiting flange (13) is kept in a tight connection state with the flip plate (10).

5. A plastic box with a sealing structure according to claim 4, characterized in that: The clamping element (12) is a fastening screw that passes through the connecting plate (11) and is threadedly connected to the cover plate (2).

6. A plastic box with a sealing structure according to claim 4, characterized in that: The groove (6) has a screw hole (14) on the bottom side, and the upper side of the connecting plate (11) has a recessed groove (15). The groove (15) has a through hole corresponding to the screw hole (14). The clamping member (12) passes through the through hole and is threadedly connected to the screw hole (14) so ​​that the clamping member (12) is pressed onto the connecting plate (11) along the thread.

7. A plastic box with a sealing structure according to claim 4, characterized in that: A second sealing ring abuts between the connecting plate (11) and the groove (6).

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