Plastic EVA (Ethylene Vinyl Acetate) forming mold with crease-resistant edge

Abstract

The utility model belongs to the technical field of EVA (Ethylene Vinyl Acetate) molds, and discloses a plastic EVA forming mold with a crease-resistant edge, which comprises an upper mold, a lower mold and a crease-resistant component, the upper mold is connected with a heating module, and the upper mold is connected with a hydraulic cylinder and is used for moving downwards to apply pressure to an EVA material; a lower mold groove is formed in the lower mold, and the lower mold is used for bearing the upper mold and the EVA material; the anti-wrinkling device comprises a lower mold, an anti-wrinkling assembly, a supporting plate, a driving part, a first roller, a second roller, a rope and an ejection assembly, the supporting plate is connected to the lower mold, the driving part is connected to the supporting plate, and the first roller and the second roller are matched with each other to drive the rope to be in a tightened state; through the arranged crease-resistant assembly, the frame can move upwards and be inserted into the upper mold, so that edge limiting is carried out on the heating module and the lower mold groove, it is ensured that the EVA material keeps stable in the shape in the thermoplastic process, and the phenomenon that the edge is folded and protrudes is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of EVA mold technology, and in particular relates to a plastic EVA molding mold with anti-wrinkle edge. Background Technology

[0002] EVA is a copolymer of ethylene and vinyl acetate. Due to its good elasticity, flexibility and environmental protection properties, EVA material is widely used in footwear, bags, toys and sporting goods. In the hot pressing process, EVA particles are heated and melted and then injected into the mold cavity, and after cooling and solidification, they form the desired shape.

[0003] In actual use, existing EVA molding dies lack a precise limiting mechanism at the contact surface between the upper and lower molds when the molds are closed. This causes the EVA material to overflow from the lower mold groove when heated and melted, forming wrinkles or burrs on the edges of the product, which seriously affects the appearance quality and dimensional accuracy of the product. Utility Model Content

[0004] This invention addresses the problem in existing technologies where the contact surface between the upper and lower molds lacks a precise limiting mechanism during mold closing, causing EVA material to overflow from the lower mold groove during heating and melting, resulting in wrinkles or burrs at the edges of the product, severely affecting the product's appearance quality and dimensional accuracy. The following technical solution is proposed:

[0005] A plastic EVA molding die with anti-wrinkle edges, comprising:

[0006] The upper mold is connected to a heating module and is connected to a hydraulic cylinder to apply pressure to the EVA material as it moves downwards.

[0007] The lower mold is equipped with a lower mold groove, and the lower mold is used to support the upper mold and EVA material;

[0008] The anti-wrinkle assembly includes a support plate, a drive component, roller one, roller two, a rope, and an ejection assembly. The support plate is connected to the lower mold, and the drive component is connected to the support plate. Rollers one and two cooperate to drive the rope to be in a taut state, and the ejection assembly can move vertically under the action of roller one, roller two, and the rope.

[0009] As a preferred embodiment of the above technical solution, a connecting frame is connected to the driving component, and the first roller is rotatably connected to the connecting frame; a mounting frame is connected to the lower mold, and the second roller is rotatably connected to the mounting frame.

[0010] As a preferred embodiment of the above technical solution, the upper mold is provided with a side groove.

[0011] As a preferred embodiment of the above technical solution, the ejection component includes:

[0012] A movable plate is located directly above the rope, which is used to propel the movable plate vertically.

[0013] Guide posts are connected to the movable plate;

[0014] Elastic element one is connected to the movable plate and is used to push the movable plate to move;

[0015] The frame, connected to the guide post, is used to be inserted into the side groove.

[0016] As a preferred embodiment of the above technical solution, it further includes an air blowing assembly, which comprises:

[0017] An air pump, connected to the lower mold, is used for blowing air;

[0018] An air inlet box and a distribution pipe, wherein the air inlet box is used to deliver gas to the distribution pipe;

[0019] A movable ring and a top cover, wherein the movable ring is used to push the top cover to move vertically.

[0020] As a preferred embodiment of the above technical solution, a ring block is connected inside the branch pipe, and an elastic element two is connected to the movable ring, with the other end of the elastic element two connected to the ring block.

[0021] The beneficial effects of this utility model are as follows:

[0022] (1) By setting up anti-wrinkle components, the frame can be moved up and inserted into the upper mold, thereby limiting the heating module and the lower mold groove at the edge, preventing EVA material from overflowing from the lower mold groove during the thermoplastic molding process, ensuring that the EVA material maintains a stable shape during the thermoplastic process, and finally obtaining the molded product of the required shape, avoiding the phenomenon of edge wrinkles and protrusions.

[0023] (2) The present invention, through the air blowing component, can move the top cover upward and push the finished product in the lower mold groove upward, so that the EVA product can be quickly separated from the lower mold groove, making it convenient for workers to quickly pick up the formed product. Attached Figure Description

[0024] Figure 1 The diagram shown is a schematic representation of the overall structure in Embodiment 1;

[0025] Figure 2 The diagram shown is a structural schematic of the upper and lower molds after they have been separated.

[0026] Figure 3 The diagram shown is a schematic representation of the internal structure of the lower mold.

[0027] Figure 4 What is shown is Figure 3 Schematic diagram of the structure of region A in the middle;

[0028] Figure 5 The diagram shown is a cross-sectional view of the lower mold and its internal structure;

[0029] Figure 6 What is shown is Figure 5 A schematic diagram of the structure of region B in the middle.

[0030] In the diagram: 1. Upper mold; 2. Lower mold; 3. Heating module; 4. Lower mold groove; 5. Support plate; 6. Drive component; 7. Connecting frame; 8. Roller 1; 9. Mounting frame; 10. Roller 2; 11. Rope; 12. Moving plate; 13. Guide column; 14. Elastic component 1; 15. Frame; 16. Side groove; 17. Air pump; 18. Air inlet box; 19. Branch pipe; 20. Ring block; 21. Movable ring; 22. Top cover; 23. Elastic component 2; 24. Support shaft. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0032] Example 1

[0033] This utility model provides a plastic EVA molding die with anti-wrinkle edges, such as Figures 1 to 6 As shown, the edge-wrinkling EVA molding die includes an upper mold 1, a lower mold 2, and a wrinkle-resistant assembly. A heating module 3 is fixedly connected to the upper mold 1, which is connected to a hydraulic cylinder for downward movement and applying pressure to the EVA material. A lower mold groove 4 is formed inside the lower mold 2, and EVA material is placed within the groove 4. The lower mold 2 supports the upper mold 1 and the EVA material. The wrinkle-resistant assembly includes a support plate 5, a driving component 6, a connecting frame 7, a first roller 8, a mounting frame 9, a second roller 10, a rope 11, and an ejection assembly. The support plate 5 is fixedly connected to... Between the inner walls of the lower mold 2, the driving component 6 is fixedly installed on the top of the support plate 5, and the top of the driving component 6 is fixedly connected to the connecting frame 7. The first roller 8 is rotatably installed on the connecting frame 7. The bottom of the inner wall of the lower mold 2 is symmetrically fixedly installed with mounting frames 9, and each set of mounting frames 9 is rotatably installed with a second roller 10. The rope 11 is movably installed on the first roller 8 and the second roller 10. The first roller 8 and the second roller 10 cooperate with each other to keep the rope 11 in a taut state. The ejection assembly can move vertically under the action of the first roller 8, the second roller 10 and the rope 11.

[0034] In this embodiment, the ejection assembly includes a movable plate 12, a guide post 13, an elastic element 14, and a frame 15. The movable plate 12 is installed directly above the rope 11, and when the rope 11 is taut, it can push the movable plate 12 to move upward. The guide post 13 is fixedly connected to the top of the movable plate 12. One end of the elastic element 14 is fixedly connected to the movable plate 12, and the other end is fixedly connected to the top of the inner wall of the lower mold 2. The frame 15 is fixedly installed on the top of the guide post 13. The upper mold 1 also has a side groove 16 inside, and the frame 15 can be inserted into the side groove 16 when it moves vertically upward.

[0035] By moving the connecting frame 7 vertically downwards, the roller 8 moves downwards and drives the lower half of the rope 11 downwards. Through the two sets of symmetrically arranged rollers 10, while the lower half of the rope 11 moves downwards, the upper half of the rope 11 gradually tends to a taut and horizontal state, thereby pushing the moving plate 12 upwards. When the moving plate 12 moves, it drives the frame 15 to be inserted into the side groove 16, thereby limiting the edge of the lower mold groove 4 and preventing edge wrinkling during the thermoplastic molding of EVA material.

[0036] In use, the EVA material to be thermoplasticized is placed into the lower mold groove 4. The operator connects the top of the upper mold 1 to the hydraulic cylinder, and drives the hydraulic cylinder to move the upper mold 1 downward, thereby moving the heating module 3 into the lower mold groove 4. Then, the drive component 6 is energized and pushes the connecting frame 7 downward. As the connecting frame 7 moves downward, it drives the roller 8 to move downward synchronously, thereby moving the lower half of the rope 11 downward. Under the action of the two sets of rollers 10, the upper half of the rope 11 gradually comes to a taut horizontal state. When the rope 11 is taut, it can push the moving plate 12 upward. When the moving plate 12 moves upward, it drives the frame 15 upward, so that the frame 15 can be inserted into the side groove 16 to limit the edge of the lower mold groove 4. Then, the heating module 3 heats and softens the material. Under the action of the frame 15, it ensures that the EVA material maintains a stable shape during the thermoplasticization process, and finally obtains the molded product of the required shape, avoiding the phenomenon of edge wrinkles and protrusions.

[0037] Specifically, the heating module 3 is equipped with a resistance wire, which is an existing heating component; the driving component 6 in this embodiment can be specifically set as an electric telescopic tube or a cylinder, and the elastic component 14 is specifically set as a spring; the rope 11 is a closed design, and the rope 11 is movably sleeved on the outside of the roller 8 and the roller 10.

[0038] It is worth noting that a support shaft 24 is also fixedly installed on the lower mold 2. There are four support shafts 24 in total, which are installed symmetrically. The upper mold 1 is slidably installed on the outer surface of the four support shafts 24. When the upper mold 1 is driven to move down by the hydraulic cylinder, the support shafts 24 provide a stable sliding path for the upper mold 1, preventing the upper mold 1 from shaking and slipping during the up and down movement.

[0039] To facilitate the removal of the thermoformed finished product, the edge-wrinkling EVA molding die also includes an air blowing assembly. The air blowing assembly includes an air pump 17, an air inlet box 18, a branch pipe 19, a ring block 20, a movable ring 21, a top cover 22, and an elastic element 23. The air pump 17 is fixedly installed on the inner wall of the lower mold 2. The air inlet box 18 is connected to the air pump 17. The end of the branch pipe 19 is fixedly connected to the air inlet box 18. The number of branch pipes 19 corresponds one-to-one with the number of lower mold slots 4 and they are all embedded inside the lower mold 2. The ring block 20 is fixedly installed inside the end of the branch pipe 19 away from the air inlet box 18. The movable ring 21 is slidably installed inside the branch pipe 19. The top end of the movable ring 21 is fixedly connected to the top cover 22. An elastic element 23 is provided between the ring block 20 and the movable ring 21. The elastic element 23 is also set as a spring. One end of the elastic element 23 is fixedly connected to the ring block 20, and the other end is fixedly connected to the movable ring 21.

[0040] In this embodiment, the top cover 22 consists of two parts: a vertical rod and a round cover. The round cover of the top cover 22 is embedded in the lower mold groove 4, and the top of the round cover is flush with the lower mold groove 4. The vertical rod of the top cover 22 is fixedly connected to the movable ring 21. A round hole is provided inside the ring block 20. The size of the round hole is equal to the inner diameter of the vertical rod of the top cover 22. Through the ring block 20, the top cover 22 can be pushed upward by the movable ring 21, and the movable ring 21 will not slide out of the branch pipe 19.

[0041] Air is blown into the air inlet box 18 by energizing the air pump 17. The gas entering the air inlet box 18 is dispersed into the branch pipe 19. When air enters the branch pipe 19, it pushes the movable ring 21 to move upward. When the movable ring 21 moves, it drives the top cover 22 to move upward synchronously, thereby pushing the molded EVA product out of the lower mold groove 4. This allows the molded EVA product to quickly leave the lower mold groove 4, making it convenient for workers to pick up and process it quickly.

[0042] Working principle: In actual use, the operator puts the EVA material into the lower mold groove 4 and connects the top of the upper mold 1 to the hydraulic cylinder, so that the hydraulic cylinder pushes the upper mold 1 to move down, thereby moving the heating module 3 into the lower mold groove 4. Then, the drive component 6 is energized to drive the connecting frame 7 to move down. When the roller 8 moves down, it drives the lower half of the rope 11 to move down. Under the action of the two sets of rollers 10, the upper half of the rope 11 is gradually brought into a taut and horizontal state. When the upper half of the rope 11 gradually tightens, it can push the moving plate 12 to move up. When the moving plate 12 moves, it drives the frame 15 to be inserted into the side groove 16, thereby limiting the edges of the lower mold groove 4 and the heating module 3. Then, the heating module 3 is energized to start heating the material in the lower mold groove 4. Under the action of the frame 15, it can ensure that the EVA material maintains a stable shape during the thermoplastic process, and finally obtain the molded product of the required shape, avoiding the phenomenon of edge wrinkles and protrusions.

[0043] After the EVA material in the lower mold groove 4 is thermoformed, the drive component 6 reverses its operation and drives the roller 8 to move upward. At this time, the compressed elastic component 14 releases its elastic potential energy, causing the moving plate 12 to move downward, thereby causing the frame 15 to be pulled out of the side groove 16. When the moving plate 12 moves downward, it squeezes the upper part of the rope 11, thereby causing the taut rope 11 in the upper part to gradually return to its original state (e.g., Figure 3 (As shown), then the hydraulic cylinder drives the upper mold 1 to move upward, so that the heating module 3 slides out of the lower mold groove 4;

[0044] Next, the air blowing assembly starts working. The air pump 17 is powered on and blows air into the air inlet box 18. After the air enters the air inlet box 18, it is evenly distributed into the branch pipe 19. Due to the increased pressure, the gas inside the branch pipe 19 pushes the movable ring 21 upward. When the movable ring 21 moves, it pushes the top cover 22 upward, thereby causing the round cover part of the top cover 22 to be ejected from the lower mold groove 4 and ejecting the molded EVA product, making it easy for the staff to pick it up quickly.

[0045] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A plastic EVA molding mold with anti-wrinkle edges, characterized in that, include: The upper mold (1) is connected to a heating module (3). The upper mold (1) is connected to a hydraulic cylinder for moving downward to apply pressure to the EVA material. The lower mold (2) is provided with a lower mold groove (4). The lower mold (2) is used to support the upper mold (1) and EVA material. The anti-wrinkle assembly includes a support plate (5), a drive component (6), a first roller (8), a second roller (10), a rope (11), and an ejection assembly. The support plate (5) is connected to the lower mold (2), and the drive component (6) is connected to the support plate (5). The first roller (8) and the second roller (10) cooperate to drive the rope (11) to be in a taut state. The ejection assembly can move vertically under the action of the first roller (8), the second roller (10), and the rope (11).

2. The edge-wrinkling plastic EVA molding die according to claim 1, characterized in that, The drive component (6) is connected to a connecting frame (7), and the first roller (8) is rotatably connected to the connecting frame (7); the lower mold (2) is connected to a mounting frame (9), and the second roller (10) is rotatably connected to the mounting frame (9).

3. The edge-wrinkling anti-wrinkle plastic EVA molding die according to claim 1, characterized in that, The upper mold (1) has a side groove (16) inside.

4. The edge-wrinkling anti-wrinkle plastic EVA molding die according to claim 1, characterized in that, The ejection component includes: A movable plate (12) is located directly above the rope (11), which is used to push the movable plate (12) to move vertically; Guide column (13) is connected to the movable plate (12); Elastic element 1 (14) is connected to the movable plate (12) and is used to push the movable plate (12) to move; The frame (15) is connected to the guide post (13) and is used to be inserted into the side groove (16).

5. The edge-wrinkling anti-wrinkle plastic EVA molding die according to claim 1, characterized in that, It also includes an air blowing assembly, the air blowing assembly comprising: An air pump (17), connected to the lower mold (2), is used for blowing air; An air intake box (18) and a branch pipe (19), wherein the air intake box (18) is used to deliver gas to the branch pipe (19); The movable ring (21) and the top cover (22) are used to push the top cover (22) to move vertically.

6. The edge-wrinkling anti-wrinkle plastic EVA molding die according to claim 5, characterized in that, The branch pipe (19) is connected to a ring block (20), and an elastic element (23) is connected to the movable ring (21). The other end of the elastic element (23) is connected to the ring block (20).

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