Fresh-keeping packaging cover with leakage-proof function

Abstract

The utility model relates to a fresh-keeping packaging cover with a leakage-proof function, the fresh-keeping packaging cover with the leakage-proof function comprises an upper cover, a base and a puncturing piece, the upper cover is screwed on the base in a covering manner, a cylindrical driving piece is arranged on the inner wall of the top of the upper cover, a sealing membrane is arranged at the opening of the bottom of the base, and the puncturing piece is arranged on the base. An annular sealing groove matched with the bottom of the driving piece is formed in the top face of the sealing diaphragm, the bottom of the driving piece is embedded in the sealing groove and is in interference fit with the inner wall of the sealing groove, and therefore a storage space for containing materials is formed among the inner wall of the top of the upper cover, the inner wall of the driving piece and the top face of the sealing diaphragm in a sealed and defined mode. The puncturing piece can move up and down and can be arranged between the outer wall of the driving piece and the inner wall of the base in a circumferential rotating mode, and when the upper cover is in a screwing upward-moving state, the driving piece pushes the puncturing piece to rotate and move downwards and cut the sealing membrane open. The utility model solves the technical problem that the sealing diaphragm is easy to leak.

Description

Technical Field

[0001] The utility model relates to the field of packaging containers, and further to a fresh-keeping packaging cover with a leak-proof function, in particular to a fresh-keeping packaging cover with a leak-proof structure arranged at a sealing film inside the cover. Background Art

[0002] At present, a lid with a separate sealed storage space has appeared on the beverage market. Its working principle is: basic raw materials (such as solid powder, concentrated liquid, medicine or probiotics, etc.) are filled into a lid with a separate sealed chamber to achieve storage and preservation of the basic raw materials. The container under the lid and matching the lid is filled with pure water or basic solution for mixing with or dissolving the basic raw materials. When drinking, the sealed chamber is opened through the switch mechanism set on the lid, and the basic raw materials are put into the packaging container below. After being fully shaken, it can be directly drunk.

[0003] The lid of the above structure generally includes an upper cover, a piercing member and a base. A membrane is arranged in the base, and a cylindrical structure is arranged in the upper cover. When the upper cover and the base are assembled, the membrane blocks the bottom opening of the cylindrical structure, thereby forming a storage chamber in the cylindrical structure for accommodating the basic raw materials. When in use, the upper cover is rotated to drive the piercing member to rotate downward through the driving structure, and the piercing member penetrates the membrane to open the storage chamber, and the solute inside the storage chamber will fall into the container below. However, in the existing structure, the basic raw materials are prone to leakage at the sealing part of the membrane, which causes the space for the piercing member or the track driving the piercing member to move to be blocked, resulting in the piercing member being unable to successfully open the membrane, which seriously affects the use effect and experience of the packaging cover.

[0004] With regard to the problem of easy leakage at the sealing part of the diaphragm in the related technology, no effective solution has been given so far.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a fresh-keeping packaging cover with a leak-proof function to overcome the defects of the prior art. Utility Model Content

[0006] The utility model aims to provide a fresh-keeping packaging cover with a leak-proof function, wherein an interference sealing structure is arranged at a sealing film to improve the sealing performance of the sealing film, avoid leakage of raw materials in the packaging cover, and ensure smooth opening of the sealing film.

[0007] The purpose of the utility model can be achieved by adopting the following scheme:

[0008] The utility model provides a fresh-keeping packaging cover with a leak-proof function, which is used to be arranged at the opening of a container body. The fresh-keeping packaging cover with a leak-proof function comprises an upper cover, a base and a puncture piece, the upper cover is screwed on the base, a cylindrical driving piece with a top seal and a bottom opening is vertically arranged on the top inner wall of the upper cover, a sealing film is arranged at the bottom opening of the base, the top surface of the sealing film is provided with an annular sealing groove that matches the bottom of the driving piece, the bottom of the driving piece is embedded in the sealing groove and is interference-fitted with the inner wall of the sealing groove, so as to seal and enclose between the top inner wall of the upper cover, the inner wall of the driving piece and the top surface of the sealing film to form a storage space for accommodating materials, the puncture piece can move up and down and can be rotatably arranged between the outer wall of the driving piece and the inner wall of the base, and when the upper cover is in a screwed upward state, the driving piece pushes the puncture piece to rotate downward and cut the sealing film.

[0009] In a preferred embodiment of the present invention, the middle portion of the sealing film protrudes upward to form a first protrusion, and the sealing film and the outer periphery of the first protrusion have a second protrusion protruding upward to form an annular sealing groove between the first protrusion and the second protrusion.

[0010] In a preferred embodiment of the present invention, in the radial direction of the sealing film, the width of the sealing groove is smaller than the thickness of the driving member, so that the bottom of the driving member is interference-fitted with the sealing groove.

[0011] In a preferred embodiment of the present invention, a first annular rib is provided at the bottom of the driving member, and the first rib is pressed tightly against the inner wall of the sealing groove.

[0012] In a preferred embodiment of the present invention, the first rib is located on the bottom inner wall and / or the bottom outer wall of the driving member.

[0013] In a preferred embodiment of the present invention, a second annular rib is provided on the inner wall of the sealing groove, and the second rib is pressed tightly against the bottom wall of the driving member.

[0014] In a preferred embodiment of the present invention, the second convex rib is located on the inner wall of the sealing groove close to the first convex portion and / or the inner wall of the sealing groove close to the second convex portion.

[0015] In a preferred embodiment of the present invention, the piercing member is a vertically arranged cylindrical structure with openings at both ends, the bottom of the piercing member is provided with cutting teeth, and the piercing member can move up and down and can rotate circumferentially so as to be sleeved on the outer side of the driving member;

[0016] A driving structure for driving the piercing member to rotate and move downward is arranged between the driving member and the piercing member, and the driving structure includes at least one driving block arranged on the outer wall of the driving member and a driving slide arranged on the inner wall of the piercing member. The upper cover is in a screwed upward state, and the driving slide abuts against the driving block and pushes the driving block to slide from bottom to top along the driving slide to push the piercing member to rotate and move downward.

[0017] In a preferred embodiment of the present invention, the number of the cutting teeth is two, and the two cutting teeth are non-radially symmetrically arranged on the piercing member.

[0018] In a preferred embodiment of the present invention, a push plate is provided at the bottom of the piercing member and at least on one side of the cutting teeth to push the sealing film to open downward after the cutting teeth cut the sealing film.

[0019] In a preferred embodiment of the present invention, an annular thin-walled area is provided on the sealing film and near its annular outer edge, the thin-walled area is provided around the outer periphery of the sealing groove, the thickness of the thin-walled area is less than the thickness of the sealing film body, and in the vertical direction, the cutting teeth are opposite to the thin-walled area;

[0020] The thin-walled area includes a connected cutting section and a retaining section, and the cutting teeth cut the sealing film along the cutting section.

[0021] In a preferred embodiment of the present invention, the inner wall of the upper cover and the outer wall of the base are provided with internal threads and external threads that are threadedly matched.

[0022] In a preferred embodiment of the present invention, a first guide thread is provided on the outer wall of the piercing member, a second guide thread is provided on the inner wall of the base, and the piercing member and the base are screwed together through the first guide thread and the second guide thread;

[0023] The number of groups of the first guide thread and the second guide thread is greater than or equal to the number of groups of the internal thread and the external thread.

[0024] In a preferred embodiment of the present invention, the first guide thread and the second guide thread are provided with matching limiting notches and limiting blocks, and the limiting blocks can be embedded in the notches to limit the initial position of the piercing member.

[0025] In a preferred embodiment of the present invention, an annular flange is formed at the bottom of the base along its circumference, and the lower part of the flange has an annular inclined surface extending from top to bottom away from the central axis, and the annular inclined surface is provided with a plurality of third ribs for heat sealing with the opening of the packaging container.

[0026] In a preferred embodiment of the present invention, a raised undercut structure is formed on the bottom inner wall of the annular slope.

[0027] In a preferred embodiment of the present utility model, the base is used to be bonded to the container body through an angle structure, a flange, a snap connection or a threaded connection.

[0028] As described above, the features and advantages of the fresh-keeping packaging cover with leak-proof function of the utility model are:

[0029] A sealing film is arranged at the bottom opening of the base, and a driving member is arranged on the top inner wall of the upper cover. By extending the bottom position of the driving member to the setting position of the sealing film, the bottom of the driving member can be pressed against the top surface of the sealing film, so that a closed storage space is formed between the top inner wall of the upper cover, the inner wall of the driving member and the top surface of the sealing film. Materials can be filled in the storage space. During the opening process, it is only necessary to screw the upper cover to move it upward, and the piercing member is pushed by the driving member to rotate downward and cut the sealing film. The materials in the storage space can pass through the bottom opening of the base and the opening on the packaging container in turn and fall into the packaging container. The material can be put into the packaging container only by screwing the upper cover. The operation is simple and convenient, which improves the consumer's experience and is suitable for promotion and use.

[0030] In order to ensure good sealing at the sealing film, an annular sealing groove matching the bottom of the driving member is provided on the top surface of the sealing film. The bottom of the driving member is embedded in the sealing groove and has an interference fit with the inner wall of the sealing groove to ensure good sealing of the storage space, avoid leakage of raw materials in the storage space when the sealing film is not opened, and ensure that the piercing member can rotate downward smoothly to achieve smooth opening of the sealing film. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0032] Figure 1 : It is one of the three-dimensional diagrams of the fresh-keeping packaging cover with leak-proof function of the utility model.

[0033] Figure 2 : It is a front cross-sectional view of the utility model with a leak-proof fresh-keeping packaging cover.

[0034] Figure 3 : It is one of the structural schematic diagrams of the matching positions of the driving member and the sealing groove in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0035] Figure 4: This is the second structural schematic diagram of the matching position of the driving member and the sealing groove in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0036] Figure 5 : This is the third structural schematic diagram of the matching position of the driving member and the sealing groove in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0037] Figure 6 : This is the fourth structural schematic diagram of the matching position of the driving member and the sealing groove in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0038] Figure 7 : It is a schematic diagram of the internal structure of the upper cover of the fresh-keeping packaging cover with a leak-proof function of the utility model.

[0039] Figure 8 : It is a three-dimensional diagram of the base in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0040] Fig. 9 : It is a front cross-sectional view of the base in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0041] Fig.10 : It is one of the three-dimensional views of the piercing member in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0042] Fig.11 : This is the second stereoscopic view of the piercing member in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0043] Fig.12 : It is a schematic diagram of the cutting position on the sealing film in the fresh-keeping packaging cover with leak-proof function of the utility model.

[0044] Fig.13 : It is the second stereoscopic view of the fresh-keeping packaging cover with leak-proof function of the utility model.

[0045] Fig.14 : It is the third stereogram of the fresh-keeping packaging cover with leak-proof function of the utility model.

[0046] The accompanying drawings in the present utility model are as follows:

[0047] 1. Upper cover; 101. Internal thread;

[0048] 2. Base; 201. External thread;

[0049] 202, second guide thread; 2021, limit block;

[0050] 203, flange; 204, annular bevel;

[0051] 205. third convex rib; 206. undercut structure;

[0052] 3. piercing member; 301. cutting teeth;

[0053] 302, driving slide; 303, push plate;

[0054] 304, first guide thread; 3041, notch;

[0055] 4. driving member; 401. first convex rib;

[0056] 402, driving block; 5, sealing film;

[0057] 501. Sealing groove; 502. First convex part;

[0058] 503, second convex portion; 504, thin-walled area;

[0059] 5041, cutting section; 5042, retaining section;

[0060] 505. Second convex rib; 6. Storage space. DETAILED DESCRIPTION

[0061] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0062] Implementation Method 1

[0063] like Figures 1 to 12 As shown, the utility model provides a fresh-keeping packaging cover with a leak-proof function, which is used to be fixedly arranged at the opening of a container body. The fresh-keeping packaging cover with a leak-proof function comprises an upper cover 1, a base 2 and a piercing member 3. The upper cover 1 is a vertically arranged cylindrical structure with a top seal and a bottom opening, and the base 2 is a vertically arranged cylindrical structure with a top opening and a bottom opening. The upper cover 1 is screwed onto the top opening of the base 2 (i.e., the upper cover 1 and the base 2 can be connected by threads), and a cylindrical driving member 4 with a top seal and a bottom opening is vertically arranged on the top inner wall of the upper cover 1, and a sealing film 5 is arranged at the bottom opening of the base 2. The top surface of the sealing film 5 has an annular sealing groove 501 that matches the bottom of the driving member 4. When the upper cover 1 and the base 2 are assembled, the bottom of the driving member 4 is embedded in the sealing groove 501 and has an interference fit with the inner wall of the sealing groove 501, so that a storage space 6 for accommodating materials is sealed and enclosed between the top inner wall of the upper cover 1, the inner wall of the driving member 4 and the top surface of the sealing film 5; the piercing member 3 can move up and down and can rotate circumferentially between the outer wall of the driving member 4 and the inner wall of the base 2. When the upper cover 1 is in a screwed upward state, the driving member 4 pushes the piercing member 3 to rotate downward and cut the sealing film 5 along a position close to the edge of the sealing film 5.

[0064] The utility model is provided with a sealing film 5 at the bottom opening of the base 2, and a driving member 4 is provided on the top inner wall of the upper cover 1. By extending the bottom position of the driving member 4 to the setting position of the sealing film 5, the bottom of the driving member 4 can be pressed against the top surface of the sealing film 5, so that a closed storage space 6 is formed between the top inner wall of the upper cover 1, the inner wall of the driving member 4 and the top surface of the sealing film 5, and materials can be filled in the storage space 6. During the opening process, it is only necessary to screw the upper cover 1 to move it upward, and the driving member 4 pushes the piercing member 3 to rotate downward and cut the sealing film 5. The materials in the storage space 6 can pass through the bottom opening of the base 2 and the opening on the packaging container in turn and fall into the packaging container. It is only necessary to screw the upper cover 1 to complete the delivery of materials. The operation is simple and convenient, which improves the consumer's experience and is suitable for popularization and use. In order to ensure good sealing performance at the sealing film 5, the utility model provides an annular sealing groove 501 matched with the bottom of the driving member 4 on the top surface of the sealing film 5, and the bottom of the driving member 4 is embedded in the sealing groove 501 and has an interference fit with the inner wall of the sealing groove 501 to ensure good sealing performance of the storage space, avoid leakage of raw materials in the storage space 6 when the sealing film 5 is not opened, and ensure that the piercing member 3 can rotate downward smoothly to realize the smooth opening of the sealing film 5.

[0065] Furthermore, the sealing film 5 can be made of, but not limited to, aluminum foil. Of course, the sealing film 5 can also be made of other easily punctured materials, which are not limited here.

[0066] Furthermore, the material may be, but is not limited to, solid powder, solid particles, concentrated liquid and other fillers.

[0067] In an optional embodiment of the present invention, Figures 2 to 6 , Fig. 9 As shown, a cylindrical first convex portion 502 is protruded upward in the middle of the sealing film 5, and a second convex portion 503 is protruded upward to form a circular ring on the sealing film 5 and located on the outer periphery of the first convex portion 502, so as to form a circular ring-shaped sealing groove 501 between the first convex portion 502 and the second convex portion 503. In the radial direction of the sealing film 5, the width of the sealing groove 501 is smaller than the thickness of the driving member 4, so that the bottom of the driving member 4 and the sealing groove 501 are interference fit, thereby ensuring good sealing between the bottom of the driving member 4 and the sealing film 5, and preventing the material in the storage space 6 from leaking from the position where the driving member 4 and the sealing film 5 are connected.

[0068] In an optional embodiment of the present invention, a first annular rib 401 is provided at the bottom of the driving member 4. When the bottom of the driving member 4 is embedded in the sealing groove 501, the first rib 401 is pressed against the inner wall of the sealing groove 501 to achieve an interference fit between the bottom of the driving member 4 and the sealing groove 501. Figure 3As shown, the first rib 401 can be arranged on the inner side wall of the bottom of the driving member 4 along the circumference of the driving member 4; in addition, as shown Figure 4 As shown, the first convex rib 401 can also be arranged on the bottom outer wall of the driving member 4 along the circumference of the driving member 4. Of course, there can be multiple first convex ribs 401, and the multiple first convex ribs 401 are respectively arranged on the bottom inner wall and the bottom outer wall of the driving member 4 along the circumference of the driving member 4 to achieve a better sealing effect.

[0069] In an optional embodiment of the present invention, an annular second rib 505 is provided on the inner wall of the sealing groove 501, and the second rib 505 is pressed against the bottom wall of the driving member 4. The second rib 505 has the same function as the first rib 401, which is to achieve an interference fit between the bottom of the driving member 4 and the sealing groove 501. Figure 5 As shown, the second rib 505 can be arranged on the inner wall of the sealing groove 501 close to the first convex portion 502 (i.e., the annular outer edge of the first convex portion 502) along the circumferential direction of the sealing groove 501; in addition, as Figure 6 As shown, the second rib 505 can also be arranged on the inner wall of the sealing groove 501 near the second convex portion 503 (i.e., the annular inner edge of the second convex portion 503) along the circumference of the sealing groove 501. Of course, the second rib 505 can also exist together with the first rib 401; there can also be multiple second ribs 505, which are respectively arranged on the inner wall of the sealing groove 501 near the first convex portion 502 and the inner wall of the sealing groove 501 near the second convex portion 503 along the circumference of the sealing groove 501. In this case, the multiple second ribs 505 are respectively pressed against the inner wall and the outer wall of the bottom of the driving member 4 to achieve a better sealing effect.

[0070] In an optional embodiment of the present invention, Figure 2 , Fig.10 , Fig.11As shown, the piercing member 3 is a cylindrical structure arranged vertically and opened at both ends. A cutting tooth 301 is arranged at the bottom of the piercing member 3. The piercing member 3 can move up and down and can be rotatably sleeved on the outer side of the driving member 4. A driving structure for driving the piercing member 3 to rotate and move downward is arranged between the driving member 4 and the piercing member 3, wherein the driving structure includes at least one driving block 402 arranged on the outer wall of the driving member 4 and a driving slide 302 arranged on the inner wall of the piercing member 3 and inclined from bottom to top. When the upper cover 1 is in the rotation When the upper edge of the driving slide 302 is in the upward state, the upper edge of the driving slide 302 is in contact with the driving block 402, and the driving member 4 and the driving block 402 are driven to rotate synchronously by rotating the upper cover 1, so that the driving block 402 can slide from bottom to top along the driving slide 302. In this process, the driving block 402 also applies an oblique thrust to the driving slide 302, so that the piercing member 3 rotates circumferentially while moving downward, so as to push the piercing member 3 to rotate downward and cut the sealing film 5 along the position close to the edge of the sealing film 5. Among them, the specific structure of the driving slide 302 (such as the driving slide 302 may include a first driving section, a second driving section and a terminal limit section) can refer to the structure of the driving slide in the Chinese utility model patent (Announcement No.: CN 217375577 U).

[0071] Furthermore, the driving member 4 and the upper cover 1 may be, but are not limited to, an integrally formed structure.

[0072] Furthermore, the number of the driving slides 302 and the number of the driving blocks 402 are both multiple and the same, and each driving slide 302 is evenly distributed along the circumference of the piercing member 3, and each driving block 402 is evenly distributed along the circumference of the driving member 4. When the upper cover 1, the base 2 and the piercing member 3 are assembled, each driving block 402 abuts against the same position on the corresponding driving slide 302. In the process of opening the sealing film 5, each driving block 402 and the corresponding driving slide 302 play a driving role, thereby increasing the driving force of the piercing member 3 and ensuring the force balance of the piercing member 3, so that the piercing member 3 can rotate and move downward smoothly, ensuring the smooth opening of the sealing film 5.

[0073] In an optional embodiment of the present invention, Fig.10 , Fig.11As shown, there are two cutting teeth 301, and the two cutting teeth 301 are arranged non-radially symmetrically on the piercing member 3 (i.e., the angle between the two cutting teeth 301 and the axis line is not 180 degrees), so that when the sealing film 5 is cut by the cutting teeth 301, a part of the sealing film 5 can be left uncut, so that when the sealing film 5 is opened, the sealing film 5 can still be connected to the base 2 and will not fall into the packaging container. Compared with only one cutting tooth 301, two cutting teeth 301 have a larger cutting range when the piercing member 3 rotates the same angle, so that the sealing film 5 can be opened without significantly rotating the upper cover 1.

[0074] Further, such as Figure 2 , Figures 9 to 12 As shown, a circular thin-walled area 504 is provided on the sealing film 5 and near its annular outer edge. The thickness of the thin-walled area 504 is less than the thickness of the main body of the sealing film 5. In the vertical direction, the cutting teeth 301 are opposite to the thin-walled area 504, so that the cutting teeth 301 can smoothly pierce the thin-walled area 504 and cut and open the sealing film 5 along the thin-walled area 504. The thin-walled area 504 includes a connected cutting section 5041 and a retaining section 5042. The cutting teeth 301 cut the sealing film 5 along the cutting section 5041, and the retaining section 5042 remains in a cutting state.

[0075] Further, such as Fig.10 , Fig.11 As shown, a push plate 303 is provided at the bottom of the piercing member 3 and at least on one side of the cutting tooth 301. In the axial direction, the length of the push plate 303 is smaller than the length of the cutting tooth 301, so that after the cutting tooth 301 cuts the sealing film 5, the sealing film 5 can be pushed downward by the push plate 303 to ensure that the material in the storage space 6 can fall smoothly into the packaging container.

[0076] In an optional embodiment of the present invention, Figure 2 , Figures 7 to 9 As shown, an internal thread 101 is provided on the inner wall of the upper cover 1 , and an external thread 201 which can be screwed together with the internal thread 101 is provided on the outer wall of the base 2 , and the upper cover 1 is screwed to the base 2 .

[0077] Further, such as Figure 2 , Figures 8 to 11As shown, the outer wall of the piercing member 3 is provided with a first guide thread 304, and the inner wall of the base 2 is provided with a second guide thread 202 that can be screwed with the first guide thread 304. The piercing member 3 and the base 2 are screwed together through the first guide thread 304 and the second guide thread 202. When the upper cover 1 is in the screwed upward state, the downward position of the piercing member 3 can be guided and limited by the cooperation of the first guide thread 304 and the second guide thread 202, so as to ensure the smooth rotation and downward movement of the piercing member 3.

[0078] Furthermore, the number of groups of the first guide thread 304 and the second guide thread 202 is greater than or equal to the number of groups of the internal thread 101 and the external thread 201. That is, one group of threads on the internal thread 101 and the external thread 201 corresponds to multiple groups of threads on the first guide thread 304 and the second guide thread 202, so that when the upper cover 1 moves one group of threads, the piercing member 3 moves multiple groups of threads correspondingly, thereby ensuring that the upper cover 1 only needs to be screwed a small number of times to achieve a large downward movement of the piercing member 3, and ensuring that the piercing member 3 can smoothly move downward to pierce the sealing film 5.

[0079] In an optional embodiment of the present invention, Figures 9 to 11 As shown, a notch 3041 is provided on the first guide thread 304, and a stopper 2021 capable of limiting the notch 3041 is provided on the second guide thread 202, and the stopper 2021 can be embedded in the notch 3041 to limit the initial position of the piercing member 3. Since the piercing member 3 and the base 2 are screwed, the first guide thread 304 on the piercing member 3 and the second guide thread 202 on the base 2 are screwed after assembly. If there is no stopper structure, the piercing member 3 can rotate and move along the thread structure, which will cause the piercing member 3 to be out of position, and there is a risk of puncturing the sealing film 5 and driving failure when the upper cover 1 is not unscrewed. The stopper structure that matches the notch 3041 with the stopper 2021 can position the piercing member 3 at the initial position, and the stopper 2021 will be destroyed when the upper cover 1 is unscrewed for the first time.

[0080] In an optional embodiment of the present invention, Figure 1 , Figure 2 , Figure 8 , Fig. 9 , Fig.12The edge of the bottom opening of the base 2 is formed with an annular flange 203 along its circumference. The lower part of the flange 203 has an annular slope 204 extending from top to bottom in a direction away from the central axis. The annular slope 204 is provided with a plurality of third ribs 205 for heat sealing with the opening of the packaging container. When the base 2 is connected to the packaging container, the annular slope 204 is matched with the opening of the packaging container. When the packaging container adopts a paper-based packaging material, the third rib 205 will be heated and melted to be bonded and fixed with the paper-based packaging material to ensure the bonding strength.

[0081] Further, such as Figure 2 , Fig. 9 As shown, the inner wall of the bottom of the annular slope 204 is formed with an annular raised undercut structure 206 along its circumference. When the base 2 is connected to the packaging container, the undercut structure 206 can limit the assembly of the base 2 and the packaging container.

[0082] In the present invention, the base 2 is used to be bonded with the container body through an angle structure, a flange, a snap connection or a threaded connection. Of course, other connection structures can also be used between the base 2 and the container body, which are not limited here.

[0083] Among them, Fig.13 As shown, the base 2 and the container body are bonded by a folded corner structure, which folds the packaging material near the opening position of the container body to form a shape matching the base 2 near the opening position of the container body, and then the base 2 and the container body are bonded, such as the connection structure in the Chinese patent (grant announcement number: CN 102673859B).

[0084] Among them, the base 2 is bonded to the container body through a flange, which forms a certain angle on the container body near the opening position, and the bottom of the base 2 has a connecting structure or a flange structure adapted to the angle, and the connecting structure or the flange structure of the base 2 is bonded to the container body near the opening position, such as the connecting structure in the Chinese patent (authorization announcement number: CN107735332 B).

[0085] The base 2 is connected to the container body by a snap-fit ​​connection, and matching bosses and grooves are respectively arranged on the container body near the opening position and on the base 2. The connection between the base 2 and the container body is achieved by the matching snap-fit ​​connection between the boss and the groove.

[0086] Among them, Fig.14 As shown, the base 2 is connected to the container body through a threaded connection, and matching threaded structures are respectively provided on the container body near the opening position and on the base 2 to achieve the threaded connection between the base 2 and the container body (such as a bottle).

[0087] The features and advantages of the fresh-keeping packaging cover with leak-proof function of the utility model are:

[0088] 1. A storage space 6 for storing materials separately is formed in the fresh-keeping packaging cover with a leak-proof function. The upper cover 1 only needs to be screwed to move it upward. The driving member 4 inside the upper cover 1 cooperates with the driving slide 302 formed on the piercing member 3 to drive the piercing member 3 to rotate in the circumferential direction and move downward at the same time, thereby cutting the sealing film 5 at the bottom of the base 2. The materials in the storage space 6 can pass through the bottom opening of the base 2 and the opening on the packaging container in turn and fall into the packaging container. The material can be put into the packaging container only by screwing the upper cover 1. The operation is simple and convenient, which improves the consumer's use experience.

[0089] 2. In the fresh-keeping packaging cover with a leak-proof function, an annular sealing groove 501 matching with the bottom of the driving member 4 is provided on the top surface of the sealing film 5, and the bottom of the driving member 4 is embedded in the sealing groove 501 and has an interference fit with the inner wall of the sealing groove 501, thereby ensuring good sealing of the storage space, avoiding leakage of raw materials in the storage space 6 when the sealing film 5 is not opened, and ensuring that the piercing member 3 can rotate downward smoothly to achieve smooth opening of the sealing film 5.

[0090] 3. The fresh-keeping packaging cover with leak-proof function can store solid, semi-solid or liquid substances, and can pierce the sealing film when assembled with other packaging. The external addition technology perfectly solves the problem of adding high-temperature easily lost or easily inactivated raw materials in aseptic packaging in the liquid milk product processing technology, improves product value, diversifies packaging application technology solutions, and maximizes the value of functional additives.

[0091] Implementation Method 2

[0092] The utility model provides a packaging container, which comprises a container body and the above-mentioned fresh-keeping packaging cover with a leak-proof function. The top of the container body is provided with an opening communicated with its inner cavity, and the fresh-keeping packaging cover with a leak-proof function is arranged at the opening of the container body.

[0093] The fresh-keeping packaging cover with a leak-proof function can be fixed to the opening of the packaging container by hot melting. Of course, the fresh-keeping packaging cover with a leak-proof function can also be connected to the packaging container by bonding, snapping, threading or other fixing methods, and the specific connection method and structure are not limited here.

[0094] The container body in the utility model can be, but is not limited to, a bottle (such as an HDPE bottle, a PET bottle), a cup (such as a plastic cup), a box (such as a paper-based packaging box), or other containers that can hold beverages.

[0095] The packaging container of the utility model has the same characteristics and advantages as the above-mentioned fresh-keeping packaging cover with leak-proof function, which will not be described in detail here.

[0096] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A fresh-keeping packaging cover with a leak-proof function, which is used to be arranged at the opening of a container body, characterized in that: The fresh-keeping packaging cover with leak-proof function comprises an upper cover, a base and a piercing member, the upper cover is screwed on the base, a cylindrical driving member with top sealing and bottom opening is vertically arranged on the top inner wall of the upper cover, a sealing film is arranged at the bottom opening of the base, the top surface of the sealing film has an annular sealing groove matching the bottom of the driving member, the bottom of the driving member is embedded in the sealing groove and has an interference fit with the inner wall of the sealing groove, so as to seal and enclose between the top inner wall of the upper cover, the inner wall of the driving member and the top surface of the sealing film to form a storage space for accommodating materials, the piercing member can move up and down and can be rotatably arranged between the outer wall of the driving member and the inner wall of the base, when the upper cover is in a screwed upward state, the driving member pushes the piercing member to rotate downward and cut the sealing film.

2. The fresh-keeping packaging cover with leak-proof function as claimed in claim 1, characterized in that: The middle part of the sealing film is convex upward to form a first convex part, and the sealing film is provided with a second convex part convex upward at the periphery of the first convex part, so as to form the annular sealing groove between the first convex part and the second convex part.

3. The fresh-keeping packaging cover with leak-proof function as claimed in claim 2, characterized in that: In the radial direction of the sealing film, the width of the sealing groove is smaller than the thickness of the driving member, so that the bottom of the driving member is interference-fitted with the sealing groove.

4. The fresh-keeping packaging cover with leak-proof function as claimed in claim 2, characterized in that: A first annular rib is provided at the bottom of the driving member, and the first rib is pressed tightly against the inner wall of the sealing groove.

5. The fresh-keeping packaging cover with leak-proof function as claimed in claim 4, characterized in that: The first convex rib is located on the bottom inner side wall and / or the bottom outer side wall of the driving member.

6. The fresh-keeping packaging cover with leak-proof function as claimed in claim 2, characterized in that: An annular second convex rib is arranged on the inner wall of the sealing groove, and the second convex rib is pressed tightly against the bottom wall of the driving member.

7. The fresh-keeping packaging cover with leak-proof function as claimed in claim 6, characterized in that: The second convex rib is located on an inner wall of the sealing groove close to the first convex portion and / or an inner wall of the sealing groove close to the second convex portion.

8. The fresh-keeping packaging cover with leak-proof function as claimed in claim 1, characterized in that: The piercing member is a vertically arranged cylindrical structure with openings at both ends, and a cutting tooth is arranged at the bottom of the piercing member. The piercing member can move up and down and can rotate circumferentially so as to be sleeved on the outer side of the driving member; A driving structure for driving the piercing member to rotate and move downward is arranged between the driving member and the piercing member, and the driving structure includes at least one driving block arranged on the outer wall of the driving member and a driving slide arranged on the inner wall of the piercing member. The upper cover is in a screwed upward state, and the driving slide abuts against the driving block and pushes the driving block to slide from bottom to top along the driving slide to push the piercing member to rotate and move downward.

9. The fresh-keeping packaging cover with leak-proof function as claimed in claim 8, characterized in that: The number of the cutting teeth is two, and the two cutting teeth are arranged on the piercing member in a non-radially symmetrical manner.

10. The fresh-keeping packaging cover with leak-proof function according to claim 8 or 9, characterized in that: A push plate is provided at the bottom of the piercing member and at least on one side of the cutting teeth, so as to push the sealing film to open downward after the cutting teeth cut the sealing film.

11. The fresh-keeping packaging cover with leak-proof function according to claim 9, characterized in that: An annular thin-walled area is arranged on the sealing film and near its annular outer edge. The thin-walled area is arranged around the outer periphery of the sealing groove. The thickness of the thin-walled area is less than the thickness of the sealing film body. In the vertical direction, the cutting teeth are opposite to the thin-walled area. The thin-walled area includes a connected cutting section and a retaining section, and the cutting teeth cut the sealing film along the cutting section.

12. The fresh-keeping packaging cover with leak-proof function according to claim 1, characterized in that: An inner wall of the upper cover and an outer wall of the base are provided with an inner thread and an outer thread which are screwed together.

13. The fresh-keeping packaging cover with leak-proof function as claimed in claim 12, characterized in that: The outer wall of the piercing member is provided with a first guide thread, the inner wall of the base is provided with a second guide thread, and the piercing member and the base are screwed together through the first guide thread and the second guide thread; The number of groups of the first guide thread and the second guide thread is greater than or equal to the number of groups of the internal thread and the external thread.

14. The fresh-keeping packaging cover with leak-proof function as claimed in claim 13, characterized in that: The first guide thread and the second guide thread are provided with matching limiting notches and limiting blocks, and the limiting blocks can be embedded in the notches to limit the initial position of the piercing member.

15. The fresh-keeping packaging cover with leak-proof function as claimed in claim 1, characterized in that: The bottom of the base is formed with an annular flange along its circumference, and the lower part of the flange has an annular inclined surface extending from top to bottom away from the central axis, and the annular inclined surface is provided with a plurality of third ribs for heat sealing with the opening of the container body.

16. The fresh-keeping packaging cover with leak-proof function as claimed in claim 15, characterized in that: A raised undercut structure is formed on the inner wall of the bottom of the annular slope.

17. The fresh-keeping packaging cover with leak-proof function as claimed in claim 1, characterized in that: The base is used to be bonded to the container body through an angle structure, a flange, a snap connection or a threaded connection.

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