Double-color injection mold heating device

Abstract

The utility model relates to a double-color injection mold heating device which comprises two injection molding machines, a heating box, a feeding hopper, a mold, a heating column and a rotating mechanism, the two injection molding machines are arranged at an interval, and the injection molding machines are arranged in the heating box, so that materials in the injection molding machines are fully melted, and the injection molding machines are in butt joint with the mold in a translation mode; a mold plate a and a mold core a arranged in the mold are each provided with two cylindrical grooves in a spaced mode, the cylindrical grooves formed in the mold plate a and the mold core a correspond to each other, the mold plate a and the mold core a are each provided with two injection molding holes in a spaced mode and located between the corresponding cylindrical grooves, and the cylindrical grooves and the injection molding holes are the same in concentricity. Injection molding pipes are fixed to the two correspondingly-formed injection molding holes correspondingly, the middles of the injection molding pipes are arranged in the heating column, and the injection molding machines are in butt joint with the injection molding holes of the mold plate a correspondingly; the rotating mechanism is fixedly connected to the middle of the template a and located between the two heating boxes.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a heating device for a two-color injection mold. Background Technology

[0002] Traditional injection molding primarily involves molding single-component materials. Traditional injection molds generally do not require complex heating devices because the molding process is relatively simple, and the material flowability and molding temperature requirements are relatively straightforward. However, two-color injection molding involves two different plastic materials, which often have different thermal properties. For example, the first material may flow well and fill the mold cavity at a lower temperature, while the second material may require a higher temperature to achieve the desired flow.

[0003] A search revealed a utility model patent in China with publication number CN210910906U, which discloses a heating device for a two-color injection mold. The device includes a housing, a steering shaft at the bottom of the housing, a foot pedal on one side of the steering shaft, a steering wheel below the foot pedal, a shock-absorbing spring on one side of the steering wheel, a motor platform on one side of the housing, a servo motor above the motor platform, a drive wheel at one end of the servo motor, a driven wheel above the drive wheel, an end cap on one side of the driven wheel, an injection port on the other side of the housing, a vent above the injection port, a hopper above the housing, a control box on one side of the hopper, a heating chamber inside the housing, a stirring shaft inside the heating chamber, turbine blades on the outer wall of the stirring shaft, a heating tube on the outer wall of the heating chamber, a heat insulation chamber on the outer wall of the heating tube, and a support plate below the heat insulation chamber. In this structure, only the injection molding machine has a heating device, while the mold itself lacks one. This can easily lead to blockage and difficulty in cleaning the injection port in the mold.

[0004] A search revealed a heating device for a plastic injection mold disclosed in Chinese utility model patent publication number CN212124096U. The device includes an injection mold body with an injection cavity at its top and a heating cavity at its bottom. A heat-conducting column is fixedly connected to the top of the heating cavity, extending from the top of the column to the bottom of the injection cavity. A support plate is fixedly connected to the bottom right side of the heating cavity's inner wall, and a through groove is formed on the left side of the inner wall. A pull plate is located at the bottom left side of the injection mold body, with a pull ring fixedly connected to its left side. A heating mechanism is located on the right side of the pull plate, extending from its right side into the heating cavity. The heating mechanism includes a heating shell, with its left side fixedly connected to the right side of the pull plate. Heating tubes are fixedly connected to the top and bottom of the inner wall of the heating shell, and the surface of the heating tubes is fitted with a heating element. The heating wire has both ends fixedly connected to the inner wall of the heating shell. First slots are provided on both sides of the top of the pull plate. A box is fixedly connected to the top left side of the injection mold body. Anti-sway mechanisms are provided on both sides of the inner wall of the box. A movable plate is fixedly connected to the inner side of the anti-sway mechanism. A return spring is fixedly connected to the top of the movable plate. The top of the return spring is fixedly connected to the top of the inner wall of the box. A threaded block is fixedly connected to the inner side of the movable plate. A threaded rod is threadedly connected to the inner cavity of the threaded block. The top of the threaded rod extends through to the top of the box and is fixedly connected to a turntable. A handle is fixedly connected to the right side of the top of the turntable. A clamping mechanism is provided on the left side of the top of the box. A first locking block is fixedly connected to the bottom of the movable plate. The bottom of the first locking block extends through to the inner cavity of the first slot. This structure does not have added heat insulation, which makes it easy for the injected plastic to stick to the mold after injection.

[0005] Therefore, the heating device for a two-color injection mold and the heating device for a plastic injection mold need further improvement. Hence, a heating device for a two-color injection mold is proposed. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a two-color injection mold heating device, which has advantages such as easy cleaning and preventing blockage of the injection port, thus solving the problem of injection heating.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a two-color injection mold heating device, comprising an injection molding machine, a heating box, a feeding hopper, a mold, a heating column, and a rotating mechanism. Two injection molding machines are spaced apart and are installed inside the heating box to ensure that the material inside the injection molding machine is fully melted and then moved to connect with the mold.

[0008] The mold has a template a and a core a, each with two cylindrical grooves spaced apart, and the cylindrical grooves on both are correspondingly arranged. The template a and the core a each have two injection holes spaced apart, and are located in the middle of the corresponding cylindrical grooves. The cylindrical grooves and the injection holes are concentric. An injection tube is fixed to each of the two corresponding injection holes, and the injection tube is set in the middle of the heating column. The injection molding machine is connected to the injection holes of the template a.

[0009] The rotating mechanism is fixedly connected to the middle of template a and located between the two heating boxes.

[0010] Furthermore, the injection molding machine has a feed port a on one side and an injection end on the other side, which is connected to the injection hole of the template a.

[0011] Furthermore, a feed inlet b is provided on one side of the heating box, and a feed inlet a is provided corresponding to the feed inlet b, and a feed hopper is provided on it. A feed pipe is fixedly connected below the feed hopper, and feed inlet a and feed inlet b are fixedly connected above and below the feed pipe, respectively.

[0012] Furthermore, the heating box has through holes a on both sides, and the two through holes a are respectively fitted on both sides of the injection molding machine. The heating box has several equally spaced connecting shafts a, and the connecting shafts a are arranged around the injection molding machine. Each connecting shaft a is provided with a heating wire a, and the inner layer of the heating box is provided with a vacuum layer a.

[0013] Furthermore, the mold also includes a template b, on which four positioning posts are spaced apart. The template b is fixedly connected to the mold core b via the positioning posts. The mold core a is provided with four positioning holes spaced apart. The positioning posts are movably fitted into the positioning holes. Each side of the mold core a and the mold core b is provided with two injection cavities spaced apart. The injection holes communicate with the injection cavities. The injection cavities contain the injection-molded mouse.

[0014] Furthermore, the heating column is hollow inside and has through holes b on both sides. The two through holes b are fitted onto the injection molding tube. The heating column has several equally spaced connecting shafts b on its inner side and is arranged around the injection molding tube. Each connecting shaft b is provided with a heating wire b. The inner layer of the heating column is provided with a vacuum layer b.

[0015] Furthermore, in the rotating mechanism, the conveying shaft is fixedly connected to the middle of the template a, and a pulley is sleeved on the conveying shaft. Two pulleys are arranged vertically at intervals, and the two pulleys are connected by a conveyor belt. The other pulley is connected to the output end of the motor.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] In this utility model, the inner layer of the heating box is provided with a vacuum layer a. The vacuum layer a can prevent the heated air in the heating box from leaking out and can also keep the outside of the heating box at a constant temperature, avoiding burns and excessively high temperature inside the control box, which would cause the injection molded product to cool down slowly. The heating box and the heating column are two independent heating systems, and the temperature can be adjusted according to the melting point of different plastics. The inner layer of the heating column is provided with a vacuum layer b to prevent the heat in the heating column 5 from leaking out and affecting the slow cooling of the plastic product injected in the injection cavity 47. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the mold of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the heating box of this utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the template a and the mold core a of this utility model;

[0022] Figure 5 This is a cross-sectional structural diagram of the heating column of this utility model.

[0023] In the diagram: 1. Injection molding machine; 10. Feed port a; 11. Injection end; 2. Heating box; 20. Feed port b; 21. Through hole a; 22. Connecting shaft a; 23. Heating wire a; 24. Vacuum layer a; 3. Feed hopper; 30. Feed pipe; 4. Mold; 40. Template a; 41. Mold core a; 411. Positioning hole; 42. Cylindrical groove; 43. Injection hole; 44. Template b; 420. Positioning pin; 45. Mold core b; 46. Injection tube; 47. Injection cavity; 48. Mouse; 5. Heating pin; 50. Connecting shaft b; 51. Heating wire b; 52. Vacuum layer b; 53. Through hole b; 6. Rotating mechanism; 60. Conveyor shaft; 61. Pulley; 62. Conveyor belt; 63. Motor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5The two-color injection mold heating device in this embodiment includes an injection molding machine 1, a heating box 2, a feeding hopper 3, a mold 4, a heating column 5, and a rotating mechanism 6. Two injection molding machines 1 are spaced apart and are placed inside the heating box 2 so that the material inside the injection molding machine 1 is fully melted and then moved to dock with the mold 4.

[0026] The mold 4 has a template a40 and a mold core a41 with two cylindrical grooves 42 spaced apart, and the cylindrical grooves 42 on both are correspondingly arranged. The template a40 and the mold core a41 are each provided with two injection holes 43 spaced apart, and are located in the middle of the corresponding cylindrical grooves 42. The cylindrical grooves 42 and the injection holes 43 are concentric. Injection tubes 46 are fixed on the two corresponding injection holes 43, and the injection tubes 46 are arranged in the middle of the heating column 5. The injection molding machine 1 is connected to the injection holes 43 of the template a40.

[0027] The rotating mechanism 6 is fixedly connected to the middle of the template a40 and located between the two heating boxes 2.

[0028] This equipment allows for simultaneous dual-cavity injection molding, and the two injection molding machines 1 can be filled with plastic granules of different colors. The heating chamber 2 and heating column 5 are two independent heating systems, and the temperature can be adjusted according to the melting point of different plastics. This equipment is housed in an intelligent control box, which controls the opening, closing, and rotation of the mold. Each of the two injection molding machines 1 has a feed port a10 on one side and an injection end 11 on the other side. The injection end 11 connects to the injection hole 43 of the template a40. The heating chamber 2 melts the plastic granules in the injection molding machines 1 and injects them into the mold 4.

[0029] A feed inlet b20 is machined on one side of the heating chamber 2. Feed inlets a10 and b20 are arranged in the same vertical direction and corresponding to each other. A feed hopper 3 is set on it, and a feed pipe 30 is welded to the bottom of the feed hopper 3. The upper and lower parts of the feed pipe 30 are welded to the feed inlets a10 and b20, respectively, so that plastic granules can enter the injection molding machine 1 from the feed hopper 3. The feed hopper 3 is conical when viewed from the side, which can accelerate the entry of plastic granules into the injection molding machine 1 and prevent plastic granules from being stuck in the feed hopper 3. Circular through holes a21 are machined on both sides of the heating chamber 2, and the two through holes a21 are welded to the two sides of the injection molding machine 1, so that the injection molding machine 1 is enclosed in the heating chamber 2. The heating chamber 2 is provided with several equally spaced connecting shafts a22, and the connecting shafts a22 are arranged around the injection molding machine 1. Each connecting shaft a22 is provided with a heating wire a23. The inner layer of the heating chamber 2 is provided with a vacuum layer a24. The vacuum layer a24 can prevent the heated air in the heating chamber 2 from leaking out, and can also keep the outside of the heating chamber 2 at a constant temperature, avoiding burns and excessively high temperature inside the control chamber, which would cause the injection molded product to cool down slowly.

[0030] After one color of plastic is injected into mold 4, the rotating mechanism can be activated to rotate mold 4 180 degrees and exchange the positions of injection cavities 47. Simultaneously, different colors of plastic can be injected when injection molding machine 1 is turned on. Template b44 is fixedly connected in the control box and can slide horizontally to accommodate the need for template a40 and mold core a41 to rotate and exchange injection cavities 47. When template a40 and mold core a41 are rotated by the rotating mechanism 6, injection molding machine 1 also needs to be moved horizontally. Template b44 has four spaced positioning posts 420, which fix mold core b45 to template b44. Mold core a41 has four spaced positioning holes 411, and the positioning posts 420 are movably fitted into the positioning holes 411. After injection molding is completed, the control box controls template b44 and mold core b45 to close together on mold core a41 and mold core b45 via the positioning posts 420. The positioning posts 420 and positioning holes 411 serve to return the mold to its original position. Two injection cavities 47 are provided on the corresponding sides of mold core a41 and mold core b45, with injection holes 43 communicating with the injection cavities 47, and a mouse 48 is installed in the injection cavity 47.

[0031] Heating columns 5 are positioned within two corresponding cylindrical grooves 42, ensuring the plastic remains in a liquid state throughout the injection molding process. The heating column 5 is hollow and has through holes b53 on both sides. These through holes b53 are fitted onto the injection tube 46, whose sides are welded to corresponding injection holes 43. This allows the plastic from the injection molding machine 1 to pass through the injection holes 43, the injection tube 46, and into the injection cavity 47 to complete the injection process. The inner side of the heating column 5 has several equally spaced connecting shafts b50 surrounding the injection tube 46. Each connecting shaft b50 is equipped with a heating wire b51 made of copper wire. Copper conducts heat quickly, ensuring the plastic in the injection tube 46 remains liquid and preventing blockage of the injection holes 43 and the injection tube 46, thus facilitating cleaning. A vacuum layer b52 is provided inside the heating column 5 to prevent heat loss and ensure the slow cooling of the plastic product injected into the injection cavity 47.

[0032] In the rotating mechanism 6, the conveyor shaft 60 is fixedly connected to the middle of the template a40. A pulley 61 is sleeved on the conveyor shaft 60. Two pulleys 61 are vertically spaced apart and connected by a conveyor belt 62. The other pulley 61 is connected to the output end of the motor 63. When the two injection cavities 47 of the mold 4 are each injected with plastic of a certain color, the rotating mechanism 6 can rotate the template a40 and the mold core a41 by 180 degrees to change the position of the two cavities and then inject plastic of a different color. When changing the position, the injection molding machine 1, the heating box 2, the template b44, and the mold core b45 are moved away to avoid safety accidents.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heating device for a two-color injection mold, comprising an injection molding machine (1), a heating box (2), a feeding hopper (3), a mold (4), a heating column (5), and a rotating mechanism (6), characterized in that: Two injection molding machines (1) are spaced apart, and the injection molding machines (1) are placed inside the heating box (2) so that the material inside the injection molding machine (1) is fully melted and then moved to the mold (4); The mold (4) has a template a (40) and a mold core a (41) with two cylindrical grooves (42) spaced apart, and the cylindrical grooves (42) on both are correspondingly arranged. The template a (40) and the mold core a (41) are respectively provided with two injection holes (43) spaced apart, and are respectively located in the middle of the corresponding cylindrical grooves (42). The cylindrical grooves (42) and the injection holes (43) are concentric. The two corresponding injection holes (43) are respectively fixed with injection tubes (46), and the injection tubes (46) are arranged in the middle of the heating column (5). The injection molding machine (1) is respectively connected to the injection holes (43) of the template a (40). The rotating mechanism (6) is fixedly connected to the middle of the template a (40) and located between the two heating boxes (2).

2. The heating device for a two-color injection mold according to claim 1, characterized in that: The injection molding machine (1) has a feed port a (10) on one side and an injection end (11) on the other side. The injection end (11) is connected to the injection hole (43) of the template a (40).

3. The heating device for a two-color injection mold according to claim 2, characterized in that: The heating box (2) has a feed inlet b (20) on one side, and the feed inlet a (10) is correspondingly provided with the feed inlet b (20), and a feed hopper (3) is provided on it. A feed pipe (30) is fixedly connected below the feed hopper (3), and the feed inlet a (10) and the feed inlet b (20) are fixedly connected above and below the feed pipe (30) respectively.

4. The heating device for a two-color injection mold according to claim 1, characterized in that: The heating box (2) has through holes a (21) on both sides, and the two through holes a (21) are respectively fitted on both sides of the injection molding machine (1). The heating box (2) has several equally spaced connecting shafts a (22), and the connecting shafts a (22) are arranged around the injection molding machine (1). Each connecting shaft a (22) is provided with a heating wire a (23). The inner layer of the heating box (2) is provided with a vacuum layer a (24).

5. The heating device for a two-color injection mold according to claim 1, characterized in that: The mold (4) is also provided with a template b (44), and four positioning pins (420) are provided on the template b (44) at intervals. The template b (44) is fixedly connected to the mold core b (45) through the positioning pins (420). The mold core a (41) is provided with four positioning holes (411) at intervals. The positioning pins (420) are movably sleeved in the positioning holes (411). The mold core a (41) and the mold core b (45) are provided with two injection cavities (47) at intervals on the opposite side. The injection hole (43) is connected to the injection cavity (47). The injection cavity (47) is provided with an injection-molded mouse (48).

6. The heating device for a two-color injection mold according to claim 1, characterized in that: The heating column (5) is hollow inside and has through holes b (53) on both sides. The two through holes b (53) are sleeved on the injection tube (46). The heating column (5) has several equally spaced connecting shafts b (50) on its inner side and is arranged around the injection tube (46). Each connecting shaft b (50) is provided with a heating wire b (51). The inner layer of the heating column (5) is provided with a vacuum layer b (52).

7. A heating device for a two-color injection mold according to claim 1, characterized in that: In the rotating mechanism (6), the conveying shaft (60) is fixedly connected to the middle of the template a (40). A pulley (61) is sleeved on the conveying shaft (60). Two pulleys (61) are arranged vertically at intervals. The two pulleys (61) are connected by a conveyor belt (62). The other pulley (61) is connected to the output end of the motor (63).

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