Water-locking sealing cover die for hemming lunch box

Abstract

The utility model discloses a mould for a water locking sealing cover of a curled lunch box, which comprises a forming mould and an edge locking mould, the forming mould is used for stamping a raw material sheet to form a primary edge folding cover with an N-shaped edge structure, and the edge locking mould is used for carrying out secondary processing on the primary edge folding cover to manufacture a finished lunch box sealing cover. The forming die comprises a movable die part and a static die part, the overlock die comprises a stamping die and a stock die, a die cavity B with the middle bottom identical to the die cavity A is formed between the stamping die and the stock die, and a guide groove is formed in the position, opposite to the stamping die, of the edge of the die cavity B; the N-shaped edge structure of the primary edge-folded cover is curled towards the inner side of the upper part based on the guide of the guide groove to prepare a meal box sealing cover; according to the sealing cover die, a group of two dies are arranged for one-time punch forming, a meal box cover which is matched with a hemming meal box and has a water locking and sealing effect can be rapidly manufactured, the die is simple in structure and convenient to manufacture, and a pressed sealing cover finished product is high in consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of lunch box molds, and particularly relates to a water-lock sealing cover mold for a curled-edge lunch box. Background Art

[0002] Thin-walled lunch boxes are widely used in occasions such as food packaging. In the prior art, paper lunch boxes are usually obtained by a casting molding method. The production molds are complex, the production is difficult, and the production cost is also high. In order to improve the manufacturing efficiency of paper lunch box tableware, the prior art also provides some prefabricated material sheets and then a die-casting process for stamping them. A mold is a tool for forming physical objects, and different molds are composed of different parts. In reality, the production of some products cannot do without molds. The lids of thin-walled lunch boxes are also manufactured through molds. At present, the structure of the lunch box lid forming machine on the market is relatively complex, the operation is cumbersome, and its production efficiency is low, which is not suitable for large-scale production. Content of the Utility Model

[0003] In view of the prior art, the purpose of the utility model is to provide a production mold for a sealed lunch box lid that can be used in cooperation with a lunch box with a curled edge and can perform water-lock sealing.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A water-lock sealing cover mold for a curled-edge lunch box includes a forming mold and a locking edge mold. The forming mold is used to stamp a raw material sheet to form a once-folded edge lid, and the locking edge mold is used to perform secondary processing on the once-folded edge lid to obtain a finished lunch box sealing cover. The forming mold includes a moving mold part and a static mold part. The moving mold part and the static mold part form a mold cavity A. At the upper edge of the mold cavity A, the moving mold part is provided with an N-shaped pressing part, and the static mold part is correspondingly provided with an N-shaped groove part. The N-shaped pressing part and the N-shaped groove part cooperate to stamp and manufacture the N-shaped edge structure of the once-folded edge lid. The locking edge mold includes a stamping mold and a shaping mold. A mold cavity B with the same middle bottom as the mold cavity A is provided between the stamping mold and the shaping mold. A guiding groove is provided at the edge of the mold cavity B opposite to the stamping mold, and a shaping ring edge is provided on the shaping mold. The N-shaped edge structure of the once-folded edge lid is curled upward and inward based on the guiding of the guiding groove to obtain a lunch box sealing cover.

[0005] As a further setting of the above solution, the forming mold and the locking edge mold include square-shaped and circular-shaped lid molds.

[0006] As a further setting of the above solution, a top material part for material demolding and a connecting rod for controlling the opening and closing of the mold are provided in both the forming mold and the locking edge mold.

[0007] As a further setting of the above solution, the stamping die of the edge-locking die includes an inner die and an outer pressing die. The outer pressing die is movably arranged relative to the inner die. The inner die is used to position the N-shaped edge structure of the once-folded lid, and the outer pressing die is used to close the die and press the N-shaped edge structure and guide it to form a curling shape after the inner die is positioned.

[0008] As a further setting of the above solution, the lunch box sealing lid made by the forming die and the edge-locking die is provided with a lid body, an inner ring edge and an outer curled edge. The inner ring edge and the outer curled edge are cooperatively buckled with the curled edge of the supporting lunch box to form a water-lock seal.

[0009] Beneficial effects: Compared with the prior art, the sealing lid die of the present utility model can quickly produce a lunch box lid that cooperates with a curled-edge lunch box to form a water-lock seal effect through one-time stamping of a set of two dies. Compared with the prior art, the die structure of this embodiment is simple and easy to manufacture, and the finished sealing lids pressed by it have strong consistency. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the forming die of the present utility model.

[0011] Figure 2 It is a schematic structural diagram of the edge-locking die of the present utility model.

[0012] Figure 3 It is a schematic three-dimensional sectional view of the forming die of the present utility model.

[0013] Figure 4 It is a schematic sectional view of the forming die of the present utility model.

[0014] Figure 5 It is a schematic three-dimensional sectional view of the edge-locking die of the present utility model.

[0015] Figure 6 It is a schematic sectional view of the edge-locking die of the present utility model.

[0016] Figure 7 It is a schematic structural diagram of the finished product of the lunch box sealing lid of the present utility model.

[0017] Figure 8 It is a schematic diagram of the forming die of the circular sealing lid of another embodiment of this example.

[0018] Figure 9 It is a schematic diagram of the edge-locking die of the circular sealing lid of another embodiment of this example.

[0019] Figure 10 It is a schematic structural diagram of the finished product of the circular lunch box sealing lid designed in another embodiment of this example.

[0020] Reference numerals: 1, forming die; 11, moving die part; 111, N-shaped pressing part; 12, stationary die part; 121, N-shaped groove part; 13, cavity A; 14, connecting rod; 15, ejector part; 2, edge-locking die; 201, inner die; 202, outer pressing die; 21, stamping die; 211, guiding groove; 22, shaping die; 221, shaping ring rib; 23, cavity B; 8, once-folded lid; 9, lunch box sealing lid; 91, lid body; 92, inner ring edge; 93, N-shaped edge structure; 94, outer curled edge. Detailed implementation manners

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] As Figure 1-7 shown, a water-lock sealing lid mold for a curled lunch box includes a forming die 1 and an edge-locking die 2. The forming die 1 is used to stamp a raw material sheet to form a once-folded lid 8, and the edge-locking die 2 is used to perform secondary processing on the once-folded lid 8 to obtain a finished lunch box sealing lid 9. The forming die 1 includes a moving die part 11 and a stationary die part 12. The moving die part 11 and the stationary die part 12 form a cavity A13. At the upper edge of the cavity A13, the moving die part 11 is provided with an N-shaped pressing part 111, and the stationary die part 12 is correspondingly provided with an N-shaped groove part 121 for the N-shaped pressing part 111. The N-shaped pressing part 111 and the N-shaped groove part 121 cooperate to stamp and manufacture the N-shaped edge structure 93 of the once-folded lid 8. The edge-locking die 2 includes a stamping die 21 and a shaping die 22. A cavity B23 with the same bottom as the cavity A13 is arranged between the stamping die 21 and the shaping die 22. A guiding groove 211 is arranged at the edge of the cavity B23 opposite to the stamping die 21. A shaping ring rib 221 is arranged on the shaping die 22. The N-shaped edge structure 93 of the once-folded lid 8 is curled upward and inward based on the guiding of the guiding groove 211 to obtain the lunch box sealing lid 9.

[0023] As a further setting of the above solution, the forming die 1 and the edge-locking die 2 include lid molds in square and circular shapes. The shape and mold structure of the circular lid body are as Figure 8-10 shown, and its internal design and principle refer to the square mold structure in 1-7.

[0024] As a further setting of the above solution, ejector parts 15 for material demolding and connecting rods 14 for controlling mold opening and closing are arranged in both the forming die 1 and the edge-locking die 2.

[0025] As a further setting of the above solution, the stamping die 21 of the edge-locking die 2 includes an inner die 201 and an outer pressing die 202. The outer pressing die 202 is movably arranged relative to the inner die 201. The inner die 201 is used to position the N-shaped edge structure 93 of the once-folded edge lid 8, and the outer pressing die 202 is used to close the die and press the N-shaped edge structure 93 and guide it to be curled and formed after the inner die 201 is positioned.

[0026] As a further setting of the above solution, the lunch box sealing lid 9 made by the forming die 1 and the edge-locking die 2 is provided with a lid body 91, an inner ring edge 92 and an outer curled edge 94. The inner ring edge 92 and the outer curled edge 94 are matched with the curled edges of the supporting lunch box to form a water-lock seal by buckling.

[0027] The mold of this embodiment includes a forming die 1. The forming die 1 is provided with a moving die part 11 and a static die part 12 that constitute a mold cavity A13. During use, driven by an external power mechanism connected by a connecting rod 14, the moving die part 11 closes the die towards the static die part 12, clamps and stamps the raw material sheet placed on the static die part 12 to form a once-folded edge lid 8. The formed once-folded edge lid 8 includes a lid body 91 formed by the cooperation of the middle parts of the moving die part 11 and the static die part 12, and an N-shaped edge structure 93 formed by the closing of the N-shaped pressing part 111 and the N-shaped groove part 121 surrounding the moving die part 11 and the static die part 12. At this point, the forming die 1 has completed pressing. Subsequently, the moving die part 11 is pulled by the connecting rod 14 to be separated from the static die part 12. Then, the ejector part 15 pushes the once-folded edge lid 8 upward to eject it from the static die part 12 for unloading;

[0028] Subsequently, the once-folded edge lid 8 as a semi-finished product is transferred into the shaping die 22 of the edge-locking die 2 at the next working station. At this time, the lid body 91 part of the once-folded edge lid 8 is basically in alignment with the groove in the die cavity B23 of the shaping die 22. Subsequently, the stamping die 21 is driven towards the shaping die 22 for die closing along with the connecting rod 14. It should be noted that when die closing, the inner die 201 of the stamping die 21 closes the die relative to the shaping die 22, while the outer pressing die 202 does not close the die temporarily. The inner die 201 and the shaping die 22 mainly constitute the lid body 91 part. After die closing, the outer pressing die 202 and the inner die 201 form a guiding groove 211, which cooperates with the shaping ring edge 221 provided on the shaping die 22, causing the N-shaped edge structure 93 to deform and curl to form an outer curled edge 94. The action process includes that after the inner die 201 and the shaping die 22 are closed, the outer pressing die 202 moves towards the shaping die 22. Based on the outer pressing die 202 moving downward closely along the outer side of the inner die 201, before approaching and not yet contacting the shaping die 22, the hemispherical groove on the outer pressing die 202 will first abut against the outer edge of the N-shaped edge structure 93, and based on the guiding of the arc surface structure, the outer edge of the N-shaped edge structure 93 extends along the arc of the spherical arc surface to generate an inward and upward curling deformation, thus forming the outer curled edge 94. After the outer curled edge 94 is shaped, it can cooperate with the inner ring edge 92 to form a groove. The groove of the sealing lid matches the annular curled edge of the curled-edge lunch box. When in use, the two are fitted together, and the annular curled edge is snapped into the groove of the sealing lid to form a deformation shrinkage type sealing structure, which has a certain strength of sealing for water, gas, etc., can improve the heat preservation ability of the box body, reduce the internal and external air circulation, and reduce the pollution of the food in the box body by the external environment.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model also intends to include these changes and modifications therein.

Claims

1. A water-locking sealing cover mold for a curled lunch box, characterized in that: The invention comprises a forming die (1) and a locking die (2), wherein the forming die (1) is used for punching a raw material sheet to form a primary folded lid (8), and the locking die (2) is used for performing secondary processing on the primary folded lid (8) to obtain a finished lunch box sealing lid (9), and the forming die (1) comprises a movable die (11) and a stationary die (12), wherein the movable die (11) and the stationary die (12) form a die cavity A (13), and an N-shaped pressing piece (111) is arranged on the upper edge of the die cavity A (13), and an N-shaped groove piece (121) is arranged on the stationary die (12) corresponding to the N-shaped pressing piece (111), and the N-shaped pressing piece (111) is provided on the stationary die (12) 1) and an N-shaped groove member (121) are used to cooperate with stamping to produce an N-shaped edge structure (93) of a one-time folding lid (8), the edge locking die (2) comprising a stamping die (21) and a shaping die (22), a cavity B (23) having a middle bottom identical to the cavity A (13) is provided between the stamping die (21) and the shaping die (22), a guide groove (211) is provided at the edge of the cavity B (23) relative to the stamping die (21), a shaping ring edge (221) is provided on the shaping die (22), and the N-shaped edge structure (93) of the one-time folding lid (8) is curled upward and inwardly based on the guidance of the guide groove (211) to produce a lunch box sealing lid (9).

2. The water-locking sealing cover mold for a curled lunch box according to claim 1, characterized in that: The forming mold (1) and the locking mold (2) include square-shaped and round-shaped cover molds.

3. The water-locking sealing cover mold for a curled lunch box according to claim 1, characterized in that: The molding die (1) and the edge locking die (2) are both provided with a material ejecting member (15) for demoulding the material and a connecting rod (14) for controlling the opening and closing of the die.

4. The water-locking sealing cover mold for a curled lunch box according to claim 1, characterized in that: The stamping die (21) of the locking die (2) comprises an inner die (201) and an outer die (202); the outer die (202) is movably arranged relative to the inner die (201); the inner die (201) is used to position the N-shaped edge structure (93) of the one-time folding cover (8); and the outer die (202) is used to close the die and press the N-shaped edge structure (93) after the inner die (201) is positioned, and guide it to perform curling forming.

5. The water-locking sealing cover mold for a curled lunch box according to claim 1, characterized in that: The lunch box sealing cover (9) produced by the forming die (1) and the edge-locking die (2) comprises a cover body (91), an inner ring edge (92) and an outer curling edge (94); the inner ring edge (92) and the outer curling edge (94) are engaged with the curling edge of the accompanying lunch box to form a water-locking seal.

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