Hemmed lunch box mold structure

Abstract

The utility model discloses a hemming lunch box mold structure which comprises a forming mold and a hemming mold, movable guide rods are arranged on the forming mold and the hemming mold, linear bearings are sleeved on the movable guide rods and used for mold closing and opening limiting of the forming mold and the hemming mold, and the hemming mold comprises a hemming bottom mold, a hemming upper mold and a core mold. The curling upper die is sleeved on the core die and moves relative to the curling bottom die and the core die through the guide of a movable guide rod, and the bakelite of the core die is also provided with an annular edge oil baffle groove; according to the hemming lunch box die, the linear bearing is arranged to replace direct contact between a guide rod and the die, abrasion is reduced, dirt is avoided, the oil blocking groove is further formed in the upper die bakelite of the hemming die, oil is prevented from being pressed and pushed to the upper die part in the die closing and splitting process of the hemming die, the overall structure is optimized by details, and the production efficiency of the hemming lunch box die is improved. The multi-target improvement of manufacturing precision, reduction of abrasion, clean production and product quality is achieved, and the method is particularly suitable for a large-scale manufacturing scene of food-grade edge-curled meal boxes.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper lunch box mould technical field, concretely relates to a kind of edge curling lunch box mould structure. BACKGROUND

[0002] Punching die is a kind of special process equipment in cold punching process, which processes materials (metal or non-metal) into parts (or semi-finished products), and is called cold punching die (commonly known as cold punching die). Punching is a kind of pressure processing method that separates or plastically deforms materials at room temperature by using dies installed on a press.

[0003] The existing technology is to make the lunch box by gluing paper sheets with seams. This lunch box is troublesome in quality and production. In addition, the lunch box is usually provided with an edge curl on the upper edge for easy use. However, the production of edge curl requires high-quality molds. The existing molds are not only complex in structure, but also have a relatively high rate of defective products. Therefore, the existing technology also designs a punching die to produce and manufacture the lunch box. The lunch box formed by punching has no seams, which is one of its characteristics. However, it is difficult to produce edge curl with a punching die. The reasons include that the raw paper sheet and the mold are easily bent under the pressure of the mold, which causes the final product to be inconsistent with the design.

[0004] The applicant's prior granted patent CN202422163938.7, a mold for edge curling lunch box, provides a set of processing molds that can quickly and smoothly curl the edge, with lower defective rate and easier molding. However, after long-term use, it is found that the mold wears out and is contaminated by oil. In addition, the existing lunch box preparation mold is prone to move during the closing of the mold, especially during the processing of the edge curling mold. The first edge curling mold is prone to shake during closing, which can cause product damage and other problems. UTILITY MODEL CONTENTS

[0005] In view of the existing technology, the purpose of the utility model is to provide an edge curling lunch box mold structure to solve the problem of dirt caused by mold friction affecting the product and the mold itself in the existing technology.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of an edge curling lunch box mold structure, which includes a forming die and an edge curling die. The forming die and the edge curling die are provided with movable guide rods. Linear bearings are sleeved on the movable guide rods. The movable guide rods are used for limiting the mold closing and opening of the forming die and the edge curling die. The edge curling die includes an edge curling bottom die, an edge curling upper die and a core die. The edge curling upper die is sleeved on the core die and guided by the movable guide rod to move relative to the edge curling bottom die and the core die.

[0007] As a further arrangement of the above-mentioned scheme, the burl edge oil blocking groove is arranged outside the bakelite and is higher than the movable stroke height of the burl edge upper die on the bakelite.

[0008] As a further arrangement of the above-mentioned scheme, the movable guide rod is fixed on the lower die of the forming die and the burl edge die, and the upper die of the forming die and the burl edge die is provided with a guide hole matched with the movable guide rod, and the inner hole diameter of the guide hole is matched with the linear bearing.

[0009] As a further arrangement of the above-mentioned scheme, the movable guide rod comprises a guide shaft rod between the mold core assemblies, a positioning guide column with a positioning guide sleeve between the mold assemblies, and an air suction and blowing pipe rod for adsorbing the raw paper sheet or the semi-finished product lunch box.

[0010] As a further arrangement of the above-mentioned scheme, the burl edge oil blocking groove is arranged outside the bakelite and is higher than the movable stroke height of the burl edge upper die on the bakelite.

[0011] As a further arrangement of the above-mentioned scheme, the burl edge die is further provided with a limiting guide shaft, the burl edge bottom die of the burl edge die is movably arranged relative to the main body, the limiting guide shaft is arranged on the burl edge bottom die and the burl edge die main body, and an ejection spring abutting at both ends on the burl edge die main body and the burl edge bottom die is further arranged, and the limiting guide shaft is used for limiting the movement of the burl edge bottom die away from the burl edge die main body.

[0012] As a further arrangement of the above-mentioned scheme, the burl edge die is further provided with a limiting guide shaft, the burl edge bottom die of the burl edge die is movably arranged relative to the main body, the limiting guide shaft is arranged on the burl edge bottom die and the burl edge die main body, and an ejection spring abutting at both ends on the burl edge die main body and the burl edge bottom die is further arranged, and the limiting guide shaft is used for limiting the movement of the burl edge bottom die away from the burl edge die main body.

[0013] Advantages: the burl edge lunch box mold has the following advantages: 1. based on the existing mold precision, wear and other problems between the mold closing and opening, the linear bearing is arranged to replace the direct contact between the guide rod and the mold, the direct contact and friction between the air pipe and the guide column and the mold are prevented, the movable guide rod further realizes the rigid positioning between the mold assemblies, effectively eliminates the cumulative error, and reduces the dirt caused by the friction of the mold; 2. the bakelite is further arranged on the upper die of the burl edge die, so that the oil is prevented from being pressed to the upper die part during the closing and opening of the burl edge die, the overall structure is optimized in details, the precision is improved, the wear is reduced, and the multiple targets of clean production are realized, and the burl edge lunch box is especially suitable for large-scale manufacturing scenes; 3. the burl edge die is further provided with a burl edge die with a push spring in the lower die cavity, the burl edge die is movably received when the semi-finished paper sheet is placed, the four edges of the burl edge die are clamped with the upper die to position the paper sheet, the horizontal movement of the paper sheet is avoided, the displacement of the paper sheet during the pressing process is avoided, and the product quality of the production and manufacturing is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1The utility model discloses a structure schematic diagram of edge curling lunch box mould.

[0015] Fig. 2 The utility model discloses an inside section schematic diagram of edge curling lunch box mould.

[0016] Fig. 3 The utility model discloses a structure schematic diagram of edge curling mould.

[0017] Fig. 1, forming mould; 2, oil immersion mould; 3, edge curling mould; 31, edge curling bottom die; 32, edge curling upper die; 33, core mould; 34, bakelite; 35, ring edge oil retaining groove; 4, movable guide rod; 41, guide shaft; 42, air suction and blowing pipe rod; 43, positioning guide column; 44, positioning guide sleeve; 45, edge folding mould; 5, linear bearing; 6, guide hole. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] As Figs. 1-3 The utility model discloses a structure of edge curling lunch box mould, including forming mould 1 and edge curling mould 3, the forming mould 1 and edge curling mould 3 are equipped with movable guide rod 4, the movable guide rod 4 is equipped with linear bearing 5, and the movable guide rod 4 is used for the mould combination of forming mould 1 and edge curling mould 3 and parting limit, the edge curling mould 3 includes edge curling bottom die 31, edge curling upper die 32 and core mould 33, the edge curling upper die 32 is equipped with on core mould 33 and is guided to the relative edge curling bottom die 31 and core mould 33 activity through movable guide rod 4.

[0020] As a further setting of the above-mentioned scheme, the bakelite 34 of the core mould 33 is further provided with a ring edge oil retaining groove 35, which is located outside the bakelite 34 and is higher than the active travel height of the edge curling upper die 32 on the bakelite 34. The purpose of this setting is to destroy the inertia of the oil upward during the operation of the edge curling upper die 32, thereby preventing the oil from flowing upward into the upper die due to the continuous upward and downward movement of the edge curling upper die 32.

[0021] As a further setting of the above-mentioned scheme, the movable guide rod 4 is fixed to the lower die of the forming mould 1 and the edge curling mould 3, and the upper die of the forming mould 1 and the edge curling mould 3 is provided with a guide hole 6 matched with the movable guide rod 4. The inner diameter of the guide hole 6 is matched with the linear bearing 5.

[0022] As a further arrangement of the above solution, the movable guide rod 4 comprises a guide shaft 41 for the mold core assembly, a positioning guide column 43 with a positioning guide sleeve 44 between the mold assemblies, and a suction and blowing pipe rod 42 for suction of the raw paper sheet or semi-finished food box.

[0023] As a further arrangement of the above solution, the edge rolling mold 3 is further provided with a limiting guide shaft 36, the edge rolling bottom die 31 of the edge rolling mold 3 is movably arranged relative to the main body, the limiting guide shaft 36 is arranged on the edge rolling bottom die 31 and the main body of the edge rolling mold 3, and a ejection spring 37 abutting at both ends on the main body of the edge rolling mold 3 and the edge rolling bottom die 31 is further arranged, the limiting guide shaft 36 is used for limiting the movement of the edge rolling bottom die 31 away from the main body of the edge rolling mold 3, as described above, the lower die of the edge rolling mold 3 of the embodiment is further provided with a movable structure relative to the main body of the lower die of the edge rolling mold 3, i.e. the limiting guide shaft 36, which is used for limiting the movement stroke of the edge rolling bottom die 31 based on the elastic pushing action of the ejection spring 37, which occurs when the mold is separated, i.e. the upper die of the edge rolling mold 3 is separated from the lower die, at this time the ejection spring 37 will elastically push the edge rolling bottom die 31 upward, and the limiting guide shaft 36 is arranged to avoid excessive movement of the ejection with a movable stroke limit.

[0024] As a further arrangement of the above solution, the edge rolling mold 3 is further provided with a folding edge mold 45, the folding edge mold 45 is provided with a pushing spring relative to the edge rolling mold 3, which is used for pushing the folding edge mold 45 to move towards the core mold 33 direction when the mold is separated, and the movable height of the folding edge mold 45 is greater than or equal to the upper end of the edge rolling bottom die 31, the purpose of this structure is to prevent the semi-finished food box from moving during the first edge rolling process, which will cause the semi-finished food box to move during the subsequent edge rolling process, and the upward movement of the folding edge mold 45 will lift the semi-finished food box from the bottom, and the semi-finished food box will be clamped and positioned on the upper pressure, which will prevent the semi-finished food box from moving, thereby ensuring the precision of the pressing process and the quality of the product.

[0025] Based on the foregoing structural configuration scheme, the embodiment optimizes and innovatively designs the forming die 1 and the two sets of edge rolling die 3 on the basis of the prior art patent CN202422163938.7 entitled “Mold for edge rolling lunch box”. Specifically, the movable guide rod 4 is additionally arranged in the forming die 1 and the edge rolling die 3, and a linear bearing 5 or a positioning guide sleeve 44 is sleeved outside the movable guide rod 4 according to the function of the movable guide rod 4. Specifically, the linear bearing 5 is arranged on the air suction and blowing pipe rod 42 and the guide shaft rod 41, and the positioning guide sleeve 44 is arranged on the positioning guide column 43 on the mold tray of the edge rolling die 3. The design significantly reduces the direct mechanical friction between the pipe rod and the mold assembly for performing the air suction and blowing operation on the raw paper sheet, thereby effectively inhibiting the dirt caused by friction from entering the mold cavity, and ensuring that the mold can maintain a clean state for a long time during the production process. In addition, the movable guide rod 4 also has a positioning function, which significantly improves the position accuracy and motion stability of the mold during the opening and closing mold movement, which is also a guarantee for the product manufacturing quality.

[0026] Further, in the edge rolling die 3 design of the embodiment, the ring edge oil blocking groove 35 is additionally arranged at the bakelite 34 part of the core die 33. It should be particularly pointed out that the position of the ring edge oil blocking groove 35 is accurately laid out and is opened in the outer side bakelite 34 area corresponding to the edge rolling upper die 32 when the edge rolling bottom die 31 does the maximum stroke movement, and is in the form of a ring groove. The main purpose of this design is to block the lubricating oil coated on the edge of the paper box by the oil immersion die 2 from penetrating into the upper mold internal structure of the edge rolling die 3 along the bakelite surface upward during the high-frequency up-and-down movement of the edge rolling upper die 32 of the subsequent edge rolling die 3 due to the adsorption and carrying effect. By effectively isolating the lubricating oil from other impurities such as mold powder that may exist in the mold interior, it can prevent the mixture of the two from forming black dirt, thereby maintaining the overall cleanliness of the mold, and further avoiding corrosion of the mold surface caused by oil stains, prolonging the service life of the mold.

[0027] Further, the edge rolling die 3 of the embodiment is based on the folding edge die 45 provided with a push spring in the lower mold cavity. The folding edge die 45 is upwardly movable when the semi-finished paper sheet is placed, and is located at the highest position of the lower mold to serve as a material receiving part. When the equipment starts to close the mold, the folding edge die 45 supporting the paper sheet is used to support the four corner edges of the paper sheet. When the upper mold is pressed down during the mold closing, the four corner edges of the folding edge die 45 will first contact the upper mold to clamp and position the paper sheet, thereby avoiding horizontal movement of the paper sheet. Further, under the continuous pressing of the upper mold, the folding edge die 45 moves downward to be completely embedded in the lower mold groove, cooperating with the mold cavity of the stroke pressing mold. This design makes the semi-finished paper box cavity adhere to the core die 33 of the upper mold, and the outer side surface adhere to the folding edge die 45 and the lower mold, thereby avoiding displacement of the paper sheet during pressing, resulting in a box with one large and one small folding edge, and ensuring product quality.

[0028] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and equivalent technology, the present application also intends to include these modifications and variations.

Claims

1. A curling box mould structure comprising a forming die (1) and a curling die (3), characterised in that: The forming die (1) and the edge curling die (3) are provided with a movable guide rod (4), the movable guide rod (4) is provided with a linear bearing (5), the movable guide rod (4) is used for limiting the mold opening and closing of the forming die (1) and the edge curling die (3), the edge curling die (3) comprises an edge curling bottom die (31), an edge curling upper die (32) and a core die (33), the edge curling upper die (32) is sleeved on the core die (33) and guided by the movable guide rod (4) to move relative to the edge curling bottom die (31) and the core die (33).

2. A curled rim lunch box mold structure according to claim 1, characterized in that: The core die (33) is further provided with a ring edge oil blocking groove (35) on the bakelite (34).

3. A curled edge lunch box mold structure according to claim 1, characterized in that: The movable guide rod (4) is fixed on the lower die of the forming die (1) and the edge curling die (3), and the upper die of the forming die (1) and the edge curling die (3) is provided with a guide hole (6) matched with the movable guide rod (4), and the inner diameter of the guide hole (6) is matched with the linear bearing (5).

4. A curled edge lunch box mold structure according to claim 1, characterized in that: The movable guide rod (4) comprises a guide shaft (41) for guiding between the mold core assemblies, a positioning guide column (43) with a positioning guide sleeve (44) between the mold assemblies, and an air suction and blowing pipe rod (42) for adsorbing raw paper sheets or semi-finished product lunch boxes.

5. A curled edge lunch box mold structure according to claim 2, wherein: The ring edge oil blocking groove (35) is located outside the bakelite (34) and is higher than the movable stroke height of the edge curling upper die (32) on the bakelite (34).

6. A curled edge lunch box mold structure according to claim 1, wherein: The edge curling die (3) is further provided with a limiting guide shaft (36), the edge curling bottom die (31) of the edge curling die (3) is movably arranged relative to the main body, the limiting guide shaft (36) is arranged on the edge curling bottom die (31) and the main body of the edge curling die (3), and further provided with a ejection spring (37) abutting at both ends on the main body of the edge curling die (3) and the edge curling bottom die (31), the limiting guide shaft (36) is used for limiting the movement of the edge curling bottom die (31) away from the main body of the edge curling die (3).

7. A curled edge lunch box mold structure according to claim 1, wherein: The edge curling die (3) is further provided with a folding edge die (45) in the cavity, the folding edge die (45) is provided with a push spring relative to the edge curling die (3), used for pushing the folding edge die (45) to move towards the core die (33) when the mold is opened, and the movable height of the folding edge die (45) is greater than or equal to the upper end of the edge curling bottom die (31).

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