Preservation container and manufacturing mold thereof

Abstract

The application relates to a fresh-keeping container, which comprises a container body and a cover body, the cover body comprises a cover surface, a ring edge and a sealing ring, the ring edge is arranged around the cover surface, the cover surface is made of glass, the ring edge is made of a material other than glass, and the cover surface and the ring edge are integrally formed. A manufacturing mold comprises a lower mold and an upper mold, the lower mold has a cover surface placing area, a lower forming area is formed around the cover surface placing area, and a vacuum adsorption assembly is arranged at the bottom of the cover surface placing area; the upper mold has a pressing block, an upper forming area is formed around the pressing block, when the mold is closed, the upper and lower forming areas jointly enclose a ring body forming area, and a forming flow channel is in communication with the ring body forming area. The integrated design of the application improves the sealing performance of the cover body of the fresh-keeping container, the vacuum degree of the fresh-keeping container is better, and the vacuum time is longer; meanwhile, the strength of the cover body is improved, and the cover body will not be deformed under negative pressure; the cover body prepared by the mold has higher machining precision and better consistency, and the machining efficiency of the cover body is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fresh-keeping containers, in particular to a fresh-keeping container and a manufacturing mold thereof. BACKGROUND

[0002] A fresh-keeping box is a container used for the storage, quality preservation and cooking process of food. Generally, the fresh-keeping box includes a box cover and a box body, the box cover is arranged on the box body, and the inside and outside of the box are isolated by the sealing between the two to achieve preservation. However, the air in the box itself will affect the preservation time.

[0003] Compared with the ordinary fresh-keeping box, the vacuum fresh-keeping box can extract the air in the box, so as to keep the vacuum state in the box, prolong the preservation time and improve the preservation effect. Generally, the vacuum fresh-keeping box is provided with an air hole on the box cover for vacuumizing, and a sealing plug is arranged in the air hole for keeping the vacuum. The structure of the sealing plug will directly affect the sealing performance of the vacuum fresh-keeping box.

[0004] The existing vacuum fresh-keeping box is usually made of plastic or glass. The box cover made of plastic is easy to process, but it is easy to deform under the influence of negative pressure in the box when the vacuum fresh-keeping box is vacuumized. Although the box cover made of glass is not easy to deform compared with the plastic, the glass material is not conducive to the connection of the sealing ring, which also affects the sealing effect of the vacuum fresh-keeping box.

[0005] Therefore, the existing box cover usually combines the glass cover surface and the plastic ring edge. This structure usually manufactures the glass cover surface and the plastic ring edge separately, and then assembles them, such as embedding the glass cover surface into the plastic ring edge, and then connecting the sealing ring to the plastic ring edge. However, it is obvious that this kind of separate connection mode makes the sealing performance of the whole box cover poor. When in use, the vacuum degree and the vacuum time in the fresh-keeping box under the negative pressure state cannot be guaranteed. After the two are manufactured separately and then assembled, the consistency of the box cover is difficult to guarantee, and the quality of the box cover also causes the reduction of the sealing performance in use. In addition, the assembly puts forward higher requirements for the structure design of the ring edge matched with the cover surface, and also reduces the processing efficiency. SUMMARY

[0006] An object of the present application is to provide a fresh-keeping container which adopts an integrally formed glass cover surface and a non-glass ring edge, so that the fresh-keeping container is not easy to deform under the vacuum state, has good sealing performance, high vacuum degree and long vacuum time.

[0007] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0008] A fresh-keeping container, comprising a container main body and a cover body, the container main body has an opening and an internal storage space, the cover body can be arranged on the opening of the container main body,

[0009] The cover body comprises a cover surface, a rim and a sealing ring, the cover surface is located in the middle, the rim is arranged around the cover surface, and the sealing ring is connected to the rim; the cover surface is made of glass, the rim is made of a material other than glass, and the cover surface and the rim are integrally formed.

[0010] Preferably, the cover surface and the rim are integrally formed by the following method, which comprises:

[0011] The cover surface is placed in a cover surface placement area of a lower mold, the lower mold has a lower forming area around the cover surface placement area, and the cover surface is adsorbed from the bottom by a vacuum adsorption assembly below the cover surface placement area; an upper mold is used to close the lower mold, the upper mold is pressed on the top of the cover surface by a pressing block, the upper mold has an upper forming area around the pressing block, and the upper forming area and the lower forming area jointly form a rim forming area after the mold is closed, and the periphery of the cover surface extends into the rim forming area.

[0012] Liquid material is injected into the rim forming area, and the liquid material is cooled and solidified to form a rim, and the rim covers the periphery of the cover surface.

[0013] The upper mold and the lower mold are opened to obtain the integrally formed cover surface and rim.

[0014] Preferably, the rim is made of plastic.

[0015] Preferably, the glass is tempered glass.

[0016] Preferably, the projection area of the cover body on the bottom surface of the container body is larger than the bottom surface area of the container body. This structure can prevent the container body from deforming during vacuumization.

[0017] Preferably, the fresh-keeping container is a vacuum fresh-keeping container, and a gas hole is formed in the cover body; the fresh-keeping container further comprises a sealing plug, and the sealing plug is arranged in the gas hole. The sealing plug can be used to vacuumize the inside of the fresh-keeping container to achieve better fresh-keeping effect.

[0018] Further preferably, the sealing plug comprises a columnar central body, the central body is arranged in the air hole, an air extraction channel is formed between the central body and the air hole, the central body is provided with an upper sealing portion and a lower sealing portion extending radially therefrom, the upper sealing portion has a greater extending distance than the lower sealing portion, the upper sealing portion is located on the side of the top surface of the cover body, the lower sealing portion is located on the side of the bottom surface of the cover body, the bottom surface of the upper sealing portion is connected with the outer circumferential surface of the central body through an upper sealing inclined surface, the upper sealing inclined surface extends from bottom to top and inclines away from the central body, and the bottom surface of the upper sealing portion inclines from top to bottom and inclines away from the central body in a natural state. In a normal pressure state, the upper sealing portion and the lower sealing portion jointly seal, and in a negative pressure state, the upper sealing portion can realize double sealing, so that the fresh-keeping container has better sealing performance in both the normal pressure state and the negative pressure state, the sealing time is longer, and a better vacuum degree is achieved.

[0019] Further preferably, when the cover body is arranged on the container body and the storage space is in a normal pressure state, the upper sealing inclined surface is located outside the air extraction channel, and the end of the upper sealing portion abuts against the top surface of the cover body; when the cover body is arranged on the container body and the storage space is in a negative pressure state, the upper sealing inclined surface moves into the air extraction channel, and the bottom surface of the upper sealing portion is tightly attached to the top surface of the cover body. The bottom surface of the upper sealing portion is arranged to be inclined in a natural state, the end thereof can abut against the top surface of the cover body, and the upper sealing portion and the lower sealing portion jointly seal in the normal pressure state; in addition, during air extraction, the sealing plug moves downward in the air hole, the root of the inclined upper sealing portion moves downward first, so that the bottom surface thereof is gradually flattened and is completely attached to the top surface of the cover body, and the upper sealing portion is not easy to be warped, so that the attachment of the bottom surface to the top surface of the cover body is ensured.

[0020] Further preferably, the lower sealing portion has a lower sealing surface, when the cover body is arranged on the container body and the storage space is in a normal pressure state, the lower sealing surface abuts against the bottom surface of the cover body or is at least partially located in the air extraction channel. The lower sealing portion can block the air extraction channel in the normal pressure state, and the upper sealing portion and the lower sealing portion jointly bear force, so that the storage space has good sealing performance in the normal pressure state, and the sealing plug is prevented from moving upward and downward in the air hole.

[0021] Still further preferably, the lower sealing surface is an inclined surface, an arc surface or a stepped surface.

[0022] Further preferably, the central body is provided with a radial extension preventing part extending radially therefrom, the radial extension preventing part is located below the lower sealing part, and the radial extension preventing part has an extension distance greater than that of the lower sealing part. The radial extension preventing part abuts against the bottom surface of the cover body when the sealing plug is opened, thereby preventing the sealing plug from falling off the cover body.

[0023] Further preferably, the central body is provided with an indication channel extending therethrough, the indication channel has an upper end and a lower end, the upper end of the indication channel is provided with an indication part, the indication part is convex upward in a natural state, and the indication part is concave downward into the indication channel in a negative pressure state. The indication part can be used to intuitively understand the sealing state.

[0024] Further preferably, the sealing plug is integrally formed, and the sealing plug is made of silica gel.

[0025] Another object of the present application is to provide a manufacturing mold for the cover body of the fresh-keeping container.

[0026] To achieve the above objects, the present application adopts the following technical scheme:

[0027] A manufacturing mold for the cover body of the fresh-keeping container, the cover body being the cover body of the vacuum fresh-keeping container, the manufacturing mold comprising a mold unit, the mold unit comprising:

[0028] a lower mold, the lower mold being provided with a cover surface placement area for placing the cover surface, a lower forming area for partially forming the ring body being formed around the cover surface placement area, and a vacuum suction assembly being arranged at the bottom of the cover surface placement area for adsorbing and fixing the cover surface;

[0029] an upper mold, the upper mold being provided with a pressing block for pressing the top of the cover surface, and an upper forming area for partially forming the ring body being formed around the pressing block,

[0030] a forming flow channel,

[0031] when the upper mold and the lower mold are closed, the upper forming area and the lower forming area jointly form a ring body forming area, and the forming flow channel is in communication with the ring body forming area.

[0032] Preferably, the vacuum suction assembly comprises a vacuum suction disc, the lower mold is provided with a suction disc placement area below the cover surface placement area for placing the vacuum suction disc, and an air flow channel in communication with the suction disc placement area. The vacuum suction disc is arranged in the suction disc placement area. The vacuum suction disc can avoid the appearance of processing marks on the glass cover surface during the forming process, maintain the smoothness of the cover surface, and improve the quality of the cover body.

[0033] Preferably, the vacuum adsorption assembly is provided in multiple groups, and the multiple groups of the vacuum adsorption assembly are uniformly distributed at the bottom of the cover surface placement area. The uniformly distributed vacuum adsorption assembly can make the force on the bottom of the cover uniform, stable in positioning, and ensure the processing precision in the forming process.

[0034] Preferably, the mold unit further comprises a positioning pin assembly, the positioning pin assembly comprises multiple positioning pins, the multiple positioning pins are arranged in the lower mold and can move along the length direction thereof, and when the multiple positioning pins pass through the upper surface of the lower mold, the multiple positioning pins enclose the cover surface placement area. The multiple positioning pins can quickly find the placement position of the cover surface placement area, thereby improving the manufacturing efficiency and the manufacturing precision.

[0035] Preferably, the mold unit further comprises a demolding pin assembly, the demolding pin assembly comprises multiple demolding pins, the multiple demolding pins are arranged in the lower mold and can move along the length direction thereof and pass through the lower forming area.

[0036] Preferably, the mold unit is provided in multiple numbers. The multiple mold units can simultaneously perform forming, thereby improving the manufacturing efficiency.

[0037] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:

[0038] The cover body of the fresh-keeping container adopts the design of integrally forming the glass cover surface and the ring edge, and air leakage does not occur between the cover surface and the ring edge, the sealing property of the cover body of the fresh-keeping container is improved, the vacuum degree of the fresh-keeping container is better, and the vacuum time is longer; meanwhile, the strength of the cover body is increased, and the cover surface does not deform under the negative pressure state of the fresh-keeping container.

[0039] The mold for integrally forming the cover surface and the ring edge is specially designed, the cover body with higher processing precision and better consistency can be obtained, and the processing efficiency of the cover body is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a perspective view of a circular vacuum fresh-keeping container in the present application; Figure 1 FIG. 2 is a perspective view of a rectangular vacuum fresh-keeping container in the present application;

[0041] FIG. 3 is a perspective view of a square vacuum fresh-keeping container in the present application; Figure 2 FIG. 4 is a perspective view of a circular vacuum fresh-keeping container in the present application;

[0042] Figure 3 FIG. 5 is a perspective view of a rectangular vacuum fresh-keeping container in the present application;

[0043] FIG. 6 is a perspective view of a square vacuum fresh-keeping container in the present application;​Figure 4 Fig. 1 is a perspective view of the present application; Figure 1 Fig. 2 is a top view of the present application;

[0044] Fig. 3 is a sectional view of the present application; Figure 5 Fig. 4 is a sectional view of the present application; Figure 4 Fig. 5 is a sectional view of the present application;

[0045] Fig. 6 is a sectional view of the present application; Figure 6 Fig. 7 is a sectional view of the present application; Figure 5 Fig. 8 is an enlarged view of the present application;

[0046] Fig. 9 is a sectional view of the present application; Figure 7 Fig. 10 is a top view of the present application;

[0047] Fig. 11 is a sectional view of the present application; Figure 8 Fig. 12 is a sectional view of the present application; Figure 7 Fig. 13 is a sectional view of the present application;

[0048] Fig. 14 is a sectional view of the present application; Figure 9 Fig. 15 is an enlarged view of the present application; Figure 8 Fig. 16 is a sectional view of the present application;

[0049] Fig. 17 is a front view of the present application; Figure 10 Fig. 18 is a front view of the present application; Fig. 19 is a front view of the present application;

[0050] Fig. 20 is a front view of the present application; Figure 11 Fig. 21 is a front view of the present application; Fig. 22 is a perspective view of the present application;

[0051] Fig. 23 is a top view of the present application; Figure 12 Fig. 24 is a sectional view of the present application; Fig. 25 is a top view of the present application;

[0052] Fig. 26 is a sectional view of the present application; Figure 13 Fig. 27 is a sectional view of the present application; Fig. 28 is a sectional view of the present application;

[0053] Fig. 29 is a sectional view of the present application; Figure 14 Fig. 30 is a sectional view of the present application; Fig. 31 is a sectional view of the present application;

[0054] Fig. 32 is a sectional view of the present application; Figure 15 Fig. 33 is a sectional view of the present application; Figure 13 Fig. 34 is a sectional view of the present application; Fig. 35 is a sectional view of the present application;

[0055] Fig. 36 is a sectional view of the present application; Figure 16 Fig. 37 is a top view of the present application;

[0056] In the above figures:

[0057] 1. container body

[0058] 2. cover 20. sealing ring 21. air hole 22. air suction passage 23. cover surface 24. ring edge 240. notch groove

[0059] 3, sealing plug; 30, center body; 300, indicating channel; 301, indicating member; 31, upper sealing portion; 310, bottom surface; 311, upper sealing slope; 32, lower sealing portion; 320, lower sealing surface; 33, anti-extraction portion;

[0060] 4, mold unit; 40, lower mold; 400, cover surface placement area; 401, lower molding area; 402, suction cup placement area; 403, air flow channel; 41, upper mold; 410, pressing block; 411, upper molding area; 42, molding runner; 43, positioning ejector pin; 44, demolding ejector pin. DETAILED DESCRIPTION

[0061] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0062] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0063] A fresh-keeping container includes a container body 1, a cover body 2, and a sealing plug 3. Wherein:

[0064] The container body 1 has an opening and an interior forming a storage space. The shape of the container body 1 can be circular, rectangular, or square, etc., as shown in Figures 1-3 Preferably, the size of the opening at the top of the container body 1 is larger than the size of the opening at the bottom, presenting an upper large and lower small shape.

[0065] The lid 2 can be placed over the opening of the container body 1 to seal the storage space of the container body 1. A sealing ring 20 is distributed around the lid 2. When the lid 2 is placed on top of the container body 1, the lid 2 and the container body 1 are sealed by the sealing ring 20. An air hole 21 is provided on the lid 2 for placing the sealing plug 3. Since the size of the lid 2 matches the opening at the top of the container body 1, that is, the projected area of ​​the lid 2 on the bottom surface of the container body 1 is larger than the bottom surface area of ​​the container body 1, i.e., the area of ​​the lid 2 is also larger than the bottom surface area of ​​the container body 1, this structure can prevent the container body 1 from deforming during the process of evacuating the container body 1.

[0066] In this embodiment: the cover 2 includes a cover surface 23 and a rim 24. The cover surface 23 is located in the center, and the rim 24 is arranged around the cover surface 23. A sealing ring 20 is connected to the rim 24. A notch 240 is provided on the edge of the rim 24. During operation, the cover 2 can be opened more easily by pushing the notch 240. The cover surface 23 is made of glass, preferably tempered glass, and the rim 24 is made of recycled glass material, specifically plastic. The cover surface 23 and the rim 24 are integrally formed.

[0067] This embodiment provides a dedicated manufacturing mold for the integrated molding of the cover 23 and the rim 24, as shown in the figure:

[0068] like Figures 12-16 The invention shown is a manufacturing mold for a vacuum preservation container lid. The manufacturing mold includes a mold unit 4, and multiple mold units 4 can be set as needed. Multiple mold units 4 can be formed simultaneously to improve manufacturing efficiency.

[0069] Mold unit 4 includes a lower mold 40, an upper mold 41, and a forming runner 42. Wherein:

[0070] The lower mold 40 has a cover placement area 400 for placing the cover 23, and a lower forming area 401 for partially forming the ring body 24 is formed around the cover placement area 400. Since the cover placement area 400 and the lower forming area 401 are connected, the mold unit 4 also includes a positioning ejector assembly to facilitate accurate placement of the cover 23 in the cover placement area 40.

[0071] The positioning ejector pin assembly includes a plurality of positioning ejector pins 43 which are arranged in the lower mold 40 and can move along the length direction thereof. Eight positioning ejector pins 43 are shown in the figure. Each positioning ejector pin 43 can be equipped with a corresponding driving mechanism. The driving mechanism can be a commonly used linear driving mechanism, and thus will not be described herein. The plurality of positioning ejector pins 43 can pass through the upper surface of the lower mold 40, and the eight positioning ejector pins 43 enclose a cover surface placement area 400. The cover surface 23 can be directly placed in the area enclosed by the eight positioning ejector pins 43, which can improve the manufacturing efficiency and the manufacturing precision.

[0072] In order to avoid the cover surface 23 placed on the cover surface placement area 400 from moving during the molding process, a vacuum suction assembly for adsorbing and fixing the cover surface 23 is arranged at the bottom of the cover surface placement area 400. The vacuum suction assembly can be arranged in multiple groups as needed. Two groups are shown in the figure. The two groups of vacuum suction assemblies are uniformly arranged at the bottom of the cover surface placement area 400, which can make the force on the bottom of the cover body 23 uniform and stable, and ensure the processing precision during the molding process. In addition, the use of vacuum suction can avoid the appearance of processing marks such as clamping marks on the glass cover surface 23 during the molding process, maintain the smoothness of the surface of the cover surface 26, and improve the quality of the cover body.

[0073] In the embodiment, the vacuum suction assembly includes a vacuum chuck (not shown in the figure). The lower mold 40 is provided with a chuck placement area 402 below the cover surface placement area 400 for placing the vacuum chuck, and an airflow channel 403 in communication with the chuck placement area 402. The vacuum chuck is arranged in the chuck placement area 402. During use, a vacuum pump is connected to the airflow channel 403 to control the adsorption of the vacuum chuck.

[0074] The upper mold 41 has a pressing block 410 for pressing the top of the cover surface 23. The pressing block 410 is surrounded by an upper molding area 411 for partially forming a ring body. When the upper mold 41 and the lower mold 40 are closed, the upper molding area 411 and the lower molding area 401 jointly enclose a ring body molding area. The molding runner 42 is in communication with the ring body molding area.

[0075] In addition, the mold unit 4 also includes a demolding ejector pin assembly which includes a plurality of demolding ejector pins 44 arranged in the lower mold 40 and can move along the length direction thereof. Eight demolding ejector pins 44 are shown in the figure. Each demolding ejector pin 44 can be equipped with a corresponding driving mechanism. The driving mechanism can be a commonly used linear driving mechanism, and thus will not be described herein. During demolding, the demolding ejector pins 44 pass through the lower molding area 401 to eject the molded cover body 2 from the lower mold 40.

[0076] The preparation process of the mold of the embodiment will be described in detail below.

[0077] 8 positioning pins 43 first pass through the upper surface of the lower mold 40, and the area enclosed between the 8 positioning pins 43 is the cover surface placement area 400. The cover surface 23 is placed in the cover surface placement area 400 enclosed by the positioning pins 43, and after placement, the vacuum chuck adsorbs the bottom surface of the cover surface 23 from the bottom,

[0078] The 8 positioning pins 43 are retracted, the upper mold 41 and the lower mold 40 are closed, and the pressing block 410 of the upper mold 41 is pressed against the top surface of the cover surface 23. The cover surface 23 is inserted into the circle body forming area which is jointly enclosed by the upper forming area 411 and the lower forming area 401,

[0079] The material liquid is injected into the circle body forming area through the forming flow channel 42, and the material liquid wraps around the four sides of the cover surface 23 in the circle body forming area. After the material liquid is injected, the material liquid is cooled and solidified to form the final circle edge 24,

[0080] The upper mold 41 and the lower mold 40 are opened, the 8 demolding pins 44 are pulled out from the lower forming area 401, and the circle edge 24 is pulled out upwards, so that the cover surface is pulled out of the lower mold 40, and the cover body 2 with the cover surface 23 and the circle edge 24 integrally formed is obtained.

[0081] As shown in Figure 10 : The sealing plug 3 is made of silica gel, and preferably, the sealing plug 3 is integrally formed.

[0082] As shown in Figures 4-9 : In this embodiment, the sealing plug 3 includes a columnar central body 30, the sealing plug 3 is arranged in the air hole 21 through the central body 30, and the central body 30 and the air hole 21 form an air extraction channel 22. An indication channel 300 is formed in the central body 30, the indication channel 300 penetrates the lower end of the central body 30, the upper end of the indication channel 300 has an indication piece 301, and the indication channel 300 can directly communicate with the inside of the container body 1. In a natural state, the storage space in the container body 1 is at normal pressure, and the indication piece 301 also remains in a natural state and bulges upwards, as shown in Figure 10 : When the container body 1 becomes negative pressure, the indication piece 301 is sucked into the indication channel 300 under pressure, forming a state of being concave into the indication channel 300, as shown in Figure 11 : In this way, the sealing state of the container can be directly and intuitively understood through the indication piece 301.

[0083] The central body 30 is provided with an upper sealing portion 31 and a lower sealing portion 32 extending radially therefrom, and the extension distance of the upper sealing portion 31 is greater than that of the lower sealing portion 32. The upper sealing portion 31 has a longer extension distance, which facilitates better sealing with the top surface of the cover surface 23 when the container is in a negative pressure state.

[0084] The upper sealing part 31 is located on the top side of the cover surface 23. The bottom surface 310 of the upper sealing part 31 is connected with the outer circumferential surface of the central body 30 through an upper sealing slope 311. The upper sealing slope 311 extends from bottom to top and inclines to the direction away from the central body 30. Meanwhile, the bottom surface 310 of the upper sealing part 31 inclines to the direction away from the central body 30 from top to bottom in the natural state.

[0085] The lower sealing part 32 is located on the bottom side of the cover surface 23. The lower sealing part 32 has a lower sealing surface 320, which is a slope or a stepped surface.

[0086] As shown in Figures 4-6 : the cover body 2 is covered on the container main body 1. At this time, the storage space in the container main body 1 is in the normal pressure state. The upper sealing slope 311 is located on the outside of the air exhaust channel 22. The bottom surface 310 of the upper sealing part 31 is in the inclined state. The end of the upper sealing part 21 abuts against the top surface of the cover body 2. Meanwhile, the lower sealing surface 320 abuts against the bottom surface of the cover body 2 or is at least partially located in the air exhaust channel 22, so that the storage space can maintain a good sealing effect in the normal pressure state.

[0087] As shown in Figures 4-6 : the cover body 2 is covered on the container main body 1. At this time, the container main body 1 is in the sealed state. The bottom surface 310 of the upper sealing part 31 is in the inclined state. The lower sealing surface 320 abuts against the bottom surface of the cover surface 23 or is at least partially located in the air exhaust channel 22, which maintains a good sealing effect in the natural state. The vacuum pump is used to exhaust air into the container main body 1 at the sealing plug 3. The gas is exhausted from the air exhaust channel 22 between the central body 30 and the air hole 21, so that the negative pressure is formed in the container main body 1. When the vacuum pump is removed, the sealing plug 3 moves downward in the air hole 21 under the action of the negative pressure. The upper sealing slope 311 moves into and is clamped in the air exhaust channel 22. Meanwhile, the root of the inclined upper sealing part 31 moves downward first, so that the bottom surface 310 is gradually flattened and completely adheres to the top surface of the cover surface 23, forming a double sealing state as shown in Figures 7-9 : so as to achieve the vacuum degree and vacuum time that other products cannot achieve.

[0088] When the cover body 2 needs to be opened, the negative pressure state of the storage space in the container main body 1 needs to be released. At this time, the sealing plug 3 is pulled upward. The upper sealing slope 311 is pulled out of the air exhaust channel 22. The adhesion of the bottom surface 310 of the upper sealing part 31 to the top surface of the cover body 2 is destroyed. The gas can enter the container main body 1 from the air exhaust channel 22, so that the negative pressure state disappears and the cover body 2 can be easily opened. Meanwhile, the sealing plug 3 will not fall off from the cover body 2 due to the blockage of the anti-falling part 33.

[0089] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A fresh-keeping container, comprising a container body and a cover, the container body having an opening and an interior forming a storage space, and the cover being capable of being arranged on the opening of the container body, characterized in that: the cover comprises a cover surface, a rim and a sealing ring, the cover surface being located in the middle, the rim being arranged around the cover surface, and the sealing ring being connected to the rim, the cover surface being made of glass, the rim being made of a material other than glass, and the cover surface and the rim being integrally formed, a gas hole being formed in the cover, the fresh-keeping container further comprising a sealing plug arranged in the gas hole, the sealing plug comprising a columnar central body arranged in the gas hole, an air extraction channel being formed between the central body and the gas hole, the central body being provided with an upper sealing part and a lower sealing part extending radially therefrom, the upper sealing part being located on one side of the top surface of the cover, the lower sealing part being located on one side of the bottom surface of the cover, the bottom surface of the upper sealing part being connected to the outer circumferential surface of the central body through an upper sealing inclined surface extending from bottom to top and inclined away from the central body, the bottom surface of the upper sealing part extending from top to bottom and inclined away from the central body in a natural state, and the lower sealing part being provided with a lower sealing surface, when the cover is arranged on the container body and the storage space is in a normal pressure state, the upper sealing inclined surface being located outside the air extraction channel, the end of the upper sealing part abutting against the top surface of the cover, and the lower sealing surface abutting against the bottom surface of the cover or at least partially located in the air extraction channel, and when the cover is arranged on the container body and the storage space is in a negative pressure state, the upper sealing inclined surface moving into the air extraction channel, and the bottom surface of the upper sealing part being tightly attached to the top surface of the cover, the cover surface and the rim being integrally formed by the following method, comprising: placing the cover surface in a cover surface placing area of a lower mold, the lower mold being provided with a lower forming area around the cover surface placing area, and the cover surface being adsorbed from the bottom by a vacuum adsorption assembly below the cover surface placing area, an upper mold being combined with the lower mold, the upper mold being tightly pressed on the top of the cover surface by a pressing block, the upper mold being provided with an upper forming area around the pressing block, the upper forming area and the lower forming area jointly forming a rim forming area after the molds are combined, and the periphery of the cover surface extending into the rim forming area, injecting liquid material into the rim forming area, and cooling and solidifying the liquid material to form the rim, the rim covering the periphery of the cover surface, and the upper mold and the lower mold being separated to obtain the integrally formed cover surface and rim. The rim is made of plastic. The projection area of the cover on the bottom surface of the container body is greater than the bottom surface area of the container body. The fresh-keeping container is a vacuum fresh-keeping container. ​ 2. The crisper container of claim 1, wherein: ​ ​ ​ ​ 3. The crisper container of claim 1, wherein: ​ 4. The crisper container of claim 1, wherein: ​ 5. The crisper container of claim 1, wherein: ​ 6. The crisper container of claim 5, wherein: The upper sealing part has a longer protruding distance than the lower sealing part.

7. The crisper container of claim 1, wherein: The lower sealing surface is an inclined surface, an arc surface or a stepped surface.

8. The crisper container of claim 1, wherein: The center body is provided with a radial protruding anti-extraction part, which is below the lower sealing part and has a longer protruding distance than the lower sealing part.

9. The crisper container of claim 1, wherein: The center body is provided with an indicating channel, which penetrates the lower end of the center body and has an indicating part at the upper end.

10. The crisper container of claim 1, wherein: The sealing plug is integrally formed and made of silica gel.

11. The crisper container of claim 2, wherein: The cover body is manufactured by a manufacturing mold, which comprises a mold unit. The lower mold has a cover surface placement area for placing the cover surface, and a lower forming area for partially forming the ring body is formed around the cover surface placement area. The upper mold has a pressing block for pressing the top of the cover surface, and an upper forming area for partially forming the ring body is formed around the pressing block. A forming flow channel is formed. When the upper mold and the lower mold are closed, the upper forming area and the lower forming area jointly form a ring body forming area, and the forming flow channel is in communication with the ring body forming area.

12. The crisper container of claim 11, wherein: The vacuum suction assembly comprises a vacuum suction disc.

13. The crisper container of claim 11 or 12, wherein: The lower mold is provided with a suction disc placement area below the cover surface placement area for placing the vacuum suction disc, and an airflow channel in communication with the suction disc placement area.

14. The crisper container of claim 11, wherein: The vacuum suction assembly is provided with multiple groups, which are evenly distributed at the bottom of the cover surface placement area.

15. The crisper container of claim 11, wherein: The mold unit further comprises a positioning pin assembly, which comprises multiple positioning pins.

16. The crisper container of claim 11, wherein: The mold unit further comprises a demolding pin assembly, which comprises multiple demolding pins. The mold unit is provided with multiple mold units.

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