One-mold multi-cavity double-color plastic part injection molding mold

Abstract

The utility model relates to a plastic mold, in particular to a one-mold multi-cavity double-color plastic part injection molding mold, which comprises a fixed mold part and a movable mold part, a mold cavity is arranged between the fixed mold part and the movable mold part, the mold cavity comprises an upper cover mold cavity, a lower cover mold cavity and a folding sheet mold cavity, and a runner blocking structure is arranged in the folding sheet mold cavity. The runner blocking structure comprises a blocking plate, the blocking plate is inserted into the folding piece mold cavity, an upper sliding rod and a lower sliding rod are arranged in the fixed mold part, one end of the upper sliding rod and one end of the lower sliding rod are connected with an oil cylinder through a movable structure, and an upper fixing rod and a lower fixing rod are arranged between the upper sliding rod and the lower sliding rod. An upper protruding block and an upper groove which are correspondingly arranged and provided with inclined faces and straight faces are arranged between the upper sliding rod and the upper fixing rod, a lower protruding block and a lower groove which are correspondingly arranged and provided with inclined faces and straight faces are arranged between the lower sliding rod and the lower fixing rod, and the upper protruding block and the upper groove are staggered with the lower protruding block and the lower groove. And the blocking plate is connected to the lower sliding rod.

Description

Technical Field

[0001] This utility model relates to an injection mold, and more particularly to a multi-cavity, two-color, integrated injection mold for plastic parts, belonging to the field of plastic molds. Background Technology

[0002] Plastic products, such as milk powder can lids, are manufactured using injection molds. Based on the product's shape and structure, the milk powder can lid includes an upper lid and a lower lid (connecting ring) integrally connected by folded pieces. The upper lid, lower lid, and folded pieces are integrally injection molded. However, in recent years, two-color milk powder can lids, where the upper and lower lids are different colors, have appeared on the market and have become popular. To achieve two-color injection molding based on existing milk powder can lid molds, a flow channel sealing structure needs to be set between the upper and lower lid mold cavities. Announcement No. CN217752457U discloses an insert barrier structure for a two-color injection mold. The insert barrier structure includes a linkage block and inserts. The linkage block is installed between the inclined slider and the insert. Sliding grooves are formed on both outer surfaces of the inclined slider, and a concave groove is formed on the top surface of the linkage block. Limiting parts are provided at both ends of the concave groove. The outer surface of the inclined slider is movably installed in the concave groove, and the two limiting parts are movably installed in their respective sliding grooves. Its disadvantages are: First, the inserts rub against the fixed mold wall and the moving mold core during the production process, which can easily cause wear and deformation, resulting in poor precision and burrs on the product, affecting the product yield. Second, the insert blocking structures cannot be linked together. For example, a mold with four, six, or eight outputs requires four, six, or eight sets of insert blocking structures, which not only occupies the internal space of the mold and affects the arrangement of the cooling water channels, but also increases the cost. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multi-cavity, two-color plastic injection mold with a high-precision flow channel sealing structure, low wear, and especially the ability to perform multi-cavity linkage sealing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multi-cavity, two-color plastic injection mold includes a fixed mold section and a moving mold section. At least two sets of mold cavities are provided between the fixed mold section and the moving mold section. Each set of mold cavities includes an upper cover mold cavity and a lower cover mold cavity, as well as a folded piece mold cavity connecting the upper cover mold cavity and the lower cover mold cavity. The fixed mold section is equipped with an upper cover injection system and a lower cover injection system. The upper cover injection system is connected to the upper cover mold cavity, and the lower cover injection system is connected to the lower cover mold cavity. An ejection system is provided in the moving mold section. Each folded piece mold cavity is equipped with a flow channel sealing structure, which includes a sealing plate and a mechanism for moving the sealing plate. The linkage mechanism, in which the sealing plate is inserted into the folding mold cavity, is located in the fixed mold section. It includes an upper sliding rod and a lower sliding rod, one end of which is connected to a hydraulic cylinder via a hinged structure. An upper fixed rod and a lower fixed rod are provided between the upper and lower sliding rods. Corresponding upper protrusions and upper grooves, each with an inclined surface and a straight surface, are respectively provided between the upper sliding rod and the upper fixed rod. Corresponding lower protrusions and lower grooves, each with an inclined surface and a straight surface, are respectively provided between the lower sliding rod and the lower fixed rod. The upper protrusions and upper grooves are staggered from the lower protrusions and lower grooves. The sealing plate is connected to the lower sliding rod.

[0006] Furthermore, a sealing flow channel is provided in the cavity of the folded sheet mold, and the sealing plate cooperates with the sealing flow channel.

[0007] Furthermore, a limiting structure is provided between the upper sliding rod and the lower sliding rod and the upper fixed rod and the lower fixed rod. The limiting structure includes corresponding limiting elongated grooves on the upper sliding rod and the lower sliding rod, corresponding through holes on the upper fixed rod and the lower fixed rod, and a limiting rod on the moving mold part, the limiting rod passing through the limiting elongated grooves and the through holes.

[0008] Furthermore, guide structures are provided on both outer sides of the upper sliding rod and the lower sliding rod. Each guide structure includes a fixing pin disposed in the fixed mold part, and a guide pulley is disposed on the fixing pin. The guide pulley contacts the outer side wall of the upper sliding rod and the lower sliding rod.

[0009] Furthermore, the movable structure includes an I-beam block movably connected to one end of the upper sliding rod and the lower sliding rod via a pin, and the I-beam groove on the I-beam block is connected to the cylinder rod of the hydraulic cylinder.

[0010] Furthermore, the upper cover mold cavity, lower cover mold cavity, and folding piece mold cavity may have two, four, six, or eight sets.

[0011] The advantages of this utility model of a multi-cavity, two-color plastic part injection mold are as follows:

[0012] 1. A sealing plate is set in the mold cavity of the folded sheet. After the product is formed, sealing marks will be left on the folded sheet. However, the folded sheet itself has fold marks, and the sealing marks can overlap with the fold marks, ensuring the overall appearance of the product.

[0013] Second, the sealing plates are driven by the linkage mechanism, that is, the sealing plates in each folding plate mold cavity can be linked. Only one set of linkage mechanism is needed to drive multiple sealing plates to move, which reduces the space occupied by the linkage mechanism in the fixed mold part, facilitates the design of the cooling water channel in the fixed mold part, and saves costs.

[0014] Third, the linkage mechanism adopts the upper and lower structure of protrusions and grooves, and is equipped with limit structure and guide slide structure. Compared with the existing technology of inclined wedge slider, the movement is more stable and smooth. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a multi-cavity, two-color plastic part injection molding die of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of a multi-cavity, two-color plastic part injection mold according to this utility model;

[0017] Figure 3 yes Figure 2 A magnified view of part A;

[0018] Figure 4 This is a schematic diagram of the guide pulley installation of this utility model;

[0019] Figure 5 This is a schematic diagram of the linkage mechanism of this utility model sliding forward and the sealing plate descending.

[0020] Figure 6 This is a schematic diagram of the linkage mechanism of this utility model retracting backward and the sealing plate rising.

[0021] Figure 7 This is a cross-sectional schematic diagram of the linkage mechanism of this utility model;

[0022] Figure 8 This is a schematic diagram of the milk powder can lid of this utility model.

[0023] The diagram shows: 1. Fixed mold section; 2. Moving mold section; 3. Upper cover mold cavity; 4. Lower cover mold cavity; 5. Folded piece mold cavity; 6. Upper cover injection system; 7. Lower cover injection system; 8. Ejection system; 9. Sealing plate; 10. Upper sliding rod; 11. Lower sliding rod; 12. Hydraulic cylinder; 13. Upper fixed rod; 14. Lower fixed rod; 15. Upper protrusion; 16. Upper groove; 17. Lower protrusion; 18. Lower groove; 19. Sealing flow channel; 20. Limiting long groove; 21. Through hole; 22. Concentric sleeve; 23. Limiting... 24. Positioning rod; 25. Fixing pin; 26. Guide pulley; 27. Pin; 28. I-beam block; 39. I-beam groove; 30. Fixed mold plate; 31. Fixed template; 32. Fixed mold insert; 33. Moving mold plate; 34. Mold foot; 35. Moving template; 36. Moving mold insert; 37. Runner frame; 38. Runner plate; 39. Top cover sprue; 40. Bottom cover sprue; 41. Top cover sprue nozzle; 42. Bottom cover sprue nozzle; 43. Top plate; 44. Ejector rod; 50. Top cover; 51. Bottom cover; 52. Folding piece. Detailed Implementation

[0024] The present invention will be described in detail below with reference to specific implementation examples. The following implementation examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way.

[0025] like Figure 1 — Figure 8 As shown, this utility model relates to a multi-cavity, two-color plastic injection molding die, comprising a fixed mold portion 1 and a moving mold portion 2. At least two sets of mold cavities are provided between the fixed mold portion 1 and the moving mold portion 2. Each set of mold cavities includes an upper cover mold cavity 3 and a lower cover mold cavity 4, and a folded piece mold cavity 5 connecting the upper cover mold cavity 3 and the lower cover mold cavity 4. An upper cover injection system 6 and a lower cover injection system 7 are provided on the fixed mold portion. The upper cover injection system 6 communicates with the upper cover mold cavity 3, and the lower cover injection system 7 communicates with the lower cover mold cavity 4. An ejection system 8 is provided in the moving mold portion 2. Each folded piece mold cavity 5 is provided with a flow channel sealing structure, which includes a sealing plate 9 and a linkage mechanism that drives the sealing plate to move. The baffle plate 9 is inserted into the folding plate mold cavity 5. The linkage mechanism is set in the fixed mold part 1, including an upper sliding rod 10 and a lower sliding rod 11 set at the top and bottom. One end of the upper sliding rod 10 and the lower sliding rod 11 is connected to the oil cylinder 12 through a movable structure. An upper fixed rod 13 and a lower fixed rod 14 are set between the upper sliding rod 10 and the lower sliding rod 11. Corresponding upper protrusions 15 and upper grooves 16 with inclined surfaces and straight surfaces are respectively set between the upper sliding rod 10 and the upper fixed rod 13. Corresponding lower protrusions 17 and lower grooves 18 with inclined surfaces and straight surfaces are respectively set between the lower sliding rod 11 and the lower fixed rod 14. The upper protrusions 15 and upper grooves 16 are staggered from the lower protrusions 17 and lower grooves 18. The sealing baffle plate 9 is connected to the lower sliding rod 11.

[0026] The fixed mold part 1 described in this solution generally includes a fixed mold plate 30, a fixed mold plate 31, and a fixed mold insert 32, etc. The moving mold part 2 generally includes a moving mold plate 33, a mold foot 34, a moving mold plate 35, and a moving mold insert 36, etc. The upper cover injection system 6 and the lower cover injection system 7 generally include a runner frame 37, a runner plate 38, an upper cover injection port 39, a lower cover injection port 40, an upper cover injection hot nozzle 41, and a lower cover injection hot nozzle 42, etc. The ejection system 7 generally includes an ejector plate 43 and an ejector rod 44, etc., all of which are existing technologies. The main feature of this solution is the flow channel sealing structure set in the folding piece mold cavity 5. During operation, the upper cover injection system 6 first injects the upper cover mold cavity 3. At this time, the sealing plate 9 is driven by the linkage mechanism to insert into the folding piece mold cavity 5, separating the upper cover mold cavity 3 from the folding piece mold cavity 5 and the lower cover mold cavity 4. After the upper cover mold cavity 3 is injected, the upper cover 50 is obtained. Then, the linkage mechanism drives the sealing plate 9 to leave the folding piece mold cavity 5, and the lower cover mold cavity 4 and the folding piece mold cavity 5 are connected to the upper cover mold cavity 3. At this time, the lower cover injection system 7 injects the lower cover mold cavity 4 and the folding piece mold cavity 5 to obtain the integrated lower cover 51 and folding piece 52. The folding piece 52 is fused with the upper cover 50 to obtain an integrally formed milk powder can lid.

[0027] The working principle of the linkage mechanism is as follows: the hydraulic cylinder 12 drives the upper sliding rod 10 and the lower sliding rod 11 to slide forward synchronously. Under the action of the flexible structure, the upper protrusion 15 slides into the upper groove 16, and the lower protrusion 17 slides out from the lower groove 18 and abuts against the lower fixed rod 14, causing the lower sliding rod 11 to drive the sealing plate 9 to descend and insert into the folding piece mold cavity 5. When resetting, the hydraulic cylinder 12 drives the upper sliding rod 10 and the lower sliding rod 11 to retract backward synchronously. Under the action of the flexible structure, the upper protrusion 15 slides out from the upper groove 16 and abuts against the upper fixed rod 13, and the lower protrusion 17 slides into the lower groove 18, causing the lower sliding rod 11 to drive the sealing plate 9 to rise and be pulled out from the folding piece mold cavity 5.

[0028] Furthermore, a sealing flow channel 19 is provided in the folding plate mold cavity 5, and the sealing plate 9 cooperates with the sealing flow channel 19. The sealing flow channel and the sealing plate cooperate more closely, reducing sealing marks.

[0029] Furthermore, a limiting structure is provided between the upper sliding rod 10 and the lower sliding rod 11 and the upper fixed rod 13 and the lower fixed rod 14. The limiting structure includes corresponding limiting elongated grooves 20 on each of the upper sliding rod 10 and the lower sliding rod 11, corresponding through holes 21 on each of the upper fixed rod 13 and the lower fixed rod 14, with concentric sleeves 22 placed in the through holes, and a limiting rod 23 on the moving mold part 2, passing through the limiting elongated grooves 20 and the concentric sleeves 22. During operation, the upper fixed rod and the lower fixed rod are fixed by the limiting rod, while the upper sliding rod and the lower sliding rod slide within the range of the limiting elongated grooves, making the fit between the upper protrusion and the upper groove, as well as the lower protrusion and the lower groove, more reliable.

[0030] Furthermore, guide structures are provided on both outer sides of the upper sliding rod 10 and the lower sliding rod 11. Each guide structure includes a fixing pin 24 disposed in the fixed mold part 1, and a guide wheel 25 disposed on the fixing pin 24. The guide wheel 25 contacts the outer side wall of the upper sliding rod 10 and the lower sliding rod 11. With the guide wheel, the friction of the upper sliding rod and the lower sliding rod is reduced during sliding, and the sliding is smoother.

[0031] Furthermore, the movable structure includes an I-beam block 27 movably connected to one end of the upper sliding rod 10 and the lower sliding rod 11 via a pin 26. The I-beam groove 28 on the I-beam block 27 is connected to the cylinder rod of the hydraulic cylinder 12. The connection between the pin and the I-beam groove allows the upper sliding rod 10 and the lower sliding rod 11 to move up and down.

[0032] Furthermore, the upper cover mold cavity 3, the lower cover mold cavity 4, and the folding piece mold cavity 5 are in two, four, six, or eight groups, with one mold having multiple cavities, resulting in high production efficiency.

[0033] The above specific embodiments are used to explain and illustrate the present utility model, and are not intended to limit the present utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A multi-cavity, two-color plastic injection mold, comprising a fixed mold portion and a moving mold portion, wherein at least two sets of mold cavities are provided between the fixed mold portion and the moving mold portion, each set of mold cavities comprising an upper cover mold cavity and a lower cover mold cavity, and a folded piece mold cavity connecting the upper cover mold cavity and the lower cover mold cavity, wherein an upper cover injection system and a lower cover injection system are provided on the fixed mold portion, the upper cover injection system being connected to the upper cover mold cavity, and the lower cover injection system being connected to the lower cover mold cavity, and an ejection system is provided in the moving mold portion, characterized in that: Each of the folded sheet mold cavities is provided with a flow channel sealing structure, which includes a sealing plate and a linkage mechanism that drives the sealing plate to move. The sealing plate is inserted into the folded sheet mold cavity. The linkage mechanism is located in the fixed mold part and includes an upper sliding rod and a lower sliding rod arranged vertically. One end of the upper sliding rod and the lower sliding rod is connected to a hydraulic cylinder through a hinged structure. An upper fixed rod and a lower fixed rod are arranged between the upper sliding rod and the lower sliding rod. Corresponding upper protrusions and upper grooves with inclined surfaces and straight surfaces are respectively arranged between the upper sliding rod and the upper fixed rod. Corresponding lower protrusions and lower grooves with inclined surfaces and straight surfaces are respectively arranged between the lower sliding rod and the lower fixed rod. The upper protrusions and upper grooves are staggered from the lower protrusions and lower grooves. The sealing plate is connected to the lower sliding rod.

2. The multi-cavity, two-color plastic injection mold as described in claim 1, characterized in that... The folded sheet mold cavity is provided with a sealing flow channel, and the sealing plate cooperates with the sealing flow channel.

3. The multi-cavity, two-color plastic injection mold as described in claim 1, characterized in that... A limiting structure is provided between the upper sliding rod and the lower sliding rod and the upper fixed rod and the lower fixed rod. The limiting structure includes a corresponding limiting long groove on each of the upper sliding rod and the lower sliding rod, a corresponding through hole on each of the upper fixed rod and the lower fixed rod, a concentric sleeve in the through hole, and a limiting rod on the moving mold part, the limiting rod passing through the limiting long groove and the concentric sleeve.

4. The multi-cavity, two-color plastic injection mold as described in claim 1, characterized in that... The upper sliding rod and the lower sliding rod are each provided with a guide structure on their outer sides. The guide structure includes a fixing pin provided in the fixed mold part, and a guide pulley is provided on the fixing pin. The guide pulley contacts the outer side wall of the upper sliding rod and the lower sliding rod.

5. The multi-cavity, two-color plastic injection mold as described in claim 1, characterized in that... The movable structure includes an I-beam block movably connected to one end of the upper sliding rod and the lower sliding rod via a pin, and the I-beam groove on the I-beam block is connected to the cylinder rod of the hydraulic cylinder.

6. The multi-cavity, two-color plastic injection mold as described in claim 1, characterized in that... The upper cover mold cavity, lower cover mold cavity, and folding piece mold cavity may have two, four, six, or eight sets.

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