Two-color injection molding device and two-color injection molding structure

Abstract

This application provides a two-color injection molding apparatus and a two-color injection molding structure. The aforementioned two-color injection molding apparatus includes a movable mold and a pin assembly. The movable mold is configured to sequentially form a primary molding cavity or a secondary molding cavity during mold closing. The movable mold has a mounting through hole that communicates with the primary molding cavity. Further, the pin assembly is located at the mounting through hole and connected to the movable mold, with one end of the pin assembly extending into the primary molding cavity and sealing the end of the mounting through hole near the primary molding cavity. Further, in the direction from the end of the pin assembly near the primary molding cavity to the other end, the outer diameter of the pin assembly located within the primary molding cavity decreases from large to small. The aforementioned two-color injection molding apparatus can effectively reduce the detachment of the one-time molded product, thereby improving processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a two-color injection molding device and a two-color injection molding structure. Background Technology

[0002] Two-color injection molding involves injecting two different materials or colors of plastic into the same mold twice, ultimately creating a single, seamlessly integrated plastic product composed of the two materials or colors. This means that the product formed after the first injection molding is not demolded but remains within the mold as it moves to another cavity, where it is then closed for a second injection molding. For example, in utility model patent application CN202010271758.4, the large mold core pulls the product out of the moving mold, then rotates 180° to return it to its original position for a second molding within the moving mold. In other words, the moving mold core is used to move the product while the product remains in the mold. In cases where a primary molded product falls off during secondary molding, as described in utility model patent application CN202223574897.8, a concave-convex structure is used on the side of the primary molded product closest to the mold that supports its movement. Specifically, the mold has a molding block groove on the side closest to the primary molded product to achieve the effect of embedding the mold into the primary molded product, enhancing the adhesion strength of the primary molded product to the mold. However, if the side of the primary molded product closest to the mold that supports its movement is a smooth surface, and the side of the primary molded product furthest from the mold that supports its movement has a more irregular shape, such as... Figure 1 As shown, a is the side closer to the mold used to support the movement of the one-piece molded product, and b is the side farther away from the mold used to support the movement of the one-piece molded product. Therefore, even with the addition of an embedded structure design on a, it is still relatively easy for the one-piece molded product to detach from the mold that supports its movement during mold opening, which affects the processing efficiency of the two-color injection molding structure. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a two-color injection molding device and a two-color injection molding structure that can effectively reduce the detachment of one-time molded products and thus improve processing efficiency.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A two-color injection molding apparatus, comprising:

[0006] A movable mold, configured to sequentially form a primary molding cavity or a secondary molding cavity during mold closing, the movable mold having a mounting through hole communicating with the primary molding cavity;

[0007] A pin-pulling assembly is provided at the mounting through hole and connected to the movable mold, and one end of the pin-pulling assembly extends into the primary molding cavity and is sealed at the end of the mounting through hole near the primary molding cavity;

[0008] In the direction from one end of the pin assembly near the primary molding cavity to the other end, the outer diameter of the pin assembly located within the primary molding cavity decreases from large to small.

[0009] In one embodiment, the pin assembly includes a fixing member and a pulling member. The fixing member is disposed at the mounting through hole, and the end of the fixing member near the primary molding cavity is blocked in the mounting through hole. The fixing member is provided with a limiting through hole, which communicates with the mounting through hole and the primary molding cavity respectively. The pulling member passes through the limiting through hole and the mounting through hole respectively and is connected to the fixing member. The end of the pulling member that is blocked in the limiting through hole near the primary molding cavity extends into the primary molding cavity.

[0010] In the direction from one end of the pulling member near the primary molding cavity to the other end, the outer diameter of the pulling member located in the primary molding cavity decreases from large to small.

[0011] In one embodiment, at least part of the end of the fixing member near the primary molding cavity extends into the primary molding cavity, and the end of the pulling member near the primary molding cavity protrudes from the end of the fixing member near the primary molding cavity.

[0012] In one embodiment, the end face of the fastener near the primary molding cavity is spaced apart from the cavity wall of the primary molding cavity.

[0013] In one embodiment, the end face of the pulling member near the primary molding cavity is spaced apart from the cavity wall of the primary molding cavity.

[0014] In one embodiment, the pulling member includes a sliding rod, a limiting block, and a pulling block. The sliding rod is slidably connected to the limiting through hole and the mounting through hole, and one end of the sliding rod protrudes from the mounting through hole away from the one-time molding cavity, while the other end of the sliding rod is connected to the limiting block.

[0015] The pulling block is disposed at one end of the limiting through hole near the primary molding cavity. The limiting block is slidably connected to the pulling block. One end of the pulling block is rotatably connected to the fixing member. The rotation axis of the pulling block intersects the sliding direction of the sliding rod. The other end of the pulling block extends at least partially into the primary molding cavity. In the direction from the end of the pulling block near the primary molding cavity to the other end, the outer diameter of the pulling block decreases from large to small.

[0016] When the sliding rod moves the limiting block to the end near the pulling block close to the primary molding cavity, the pulling block and the limiting block together block the end of the limiting through hole close to the primary molding cavity, and the end of the pulling block close to the primary molding cavity is clamped on the wall of the limiting block and the limiting through hole; when the sliding rod moves the limiting block to the end away from the primary molding cavity, the end of the pulling block away from the primary molding cavity is positioned away from the wall of the limiting through hole.

[0017] In one embodiment, the end of the limiting block away from the sliding rod protrudes from the end face of the pulling block near the primary molding cavity.

[0018] In one embodiment, the pulling block is provided with a first wedge-shaped surface on the side wall near the wall of the limiting through hole, and the first wedge-shaped surface is disposed away from the one-time forming cavity.

[0019] In one embodiment, there are two pulling blocks, each of which is disposed at one end of the limiting through hole near the primary molding cavity. The two pulling blocks are disposed opposite to each other on the two sides of the limiting block. Each pulling block has a first wedge-shaped surface on the side away from the limiting block. The first wedge-shaped surface of each pulling block is disposed away from the primary molding cavity. One end of each pulling block is rotatably connected to the fixing member. The rotation axis of each pulling block intersects with the sliding direction of the sliding rod. The other end of each pulling block extends at least partially into the primary molding cavity. The limiting block is slidably connected between the two pulling blocks.

[0020] When the sliding rod moves the limiting block to the end near the pull block close to the primary molding cavity, the two pull blocks and the limiting block together block the end of the limiting through hole close to the primary molding cavity, and the end of each pull block close to the primary molding cavity is clamped on the wall of the limiting block and the limiting through hole; when the sliding rod moves the limiting block to the end away from the primary molding cavity, the end of each pull block away from the primary molding cavity is positioned away from the wall of the limiting through hole.

[0021] In one embodiment, each of the pulling blocks has an intersecting sliding surface and a second wedge-shaped surface on the side near the limiting block. The sliding surface is located at the end of the pulling block near the primary molding cavity, and the second wedge-shaped surface is located at the end of the pulling block away from the primary molding cavity. The sliding surface is parallel to the sliding direction of the sliding rod, and the second wedge-shaped surface is disposed towards the primary molding cavity.

[0022] When the sliding rod moves the limiting block to the end near the end of the pulling block close to the primary molding cavity, the sliding surfaces of the two pulling blocks are attached to the opposite side surfaces of the limiting block; when the sliding rod moves the limiting block to the end near the end of the pulling block away from the primary molding cavity, the limiting block abuts against the second wedge-shaped surface of each pulling block, and the end of each pulling block near the primary molding cavity rotates toward the direction close to the limiting block.

[0023] In one embodiment, the two sides of the limiting block and the two pulling blocks opposite each other are parallel to the direction of gravity.

[0024] A two-color injection molding structure is obtained by injection molding using the two-color injection molding device described in any of the above embodiments, so that a waste groove is formed on the two-color injection molding structure, and the wall of the waste groove is provided with a wedge-shaped surface, the wedge-shaped surface being disposed towards the bottom of the waste groove.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] This utility model discloses a two-color injection molding device in which the movable mold serves as the carrier and moving part of the product formed in the primary molding cavity. A pin assembly is positioned at the mounting through hole and connected to the movable mold. One end of the pin assembly extends into the primary molding cavity and seals the end of the mounting through hole near the primary molding cavity. In the direction from the end of the pin assembly near the primary molding cavity to the other end, the outer diameter of the pin assembly within the primary molding cavity decreases from large to small. This allows the pin assembly to extend into the primary molding cavity and embed itself in the product formed within the cavity. Since the outer diameter of the end of the pin assembly near the primary molding cavity is larger than the outer diameter at other locations, mechanical interference occurs between the pin assembly and the product formed in the primary molding cavity, preventing the product from detaching from the pin assembly. This effectively reduces the likelihood of the product detaching from the movable mold within the primary molding cavity, thereby significantly improving the processing efficiency of the two-color injection molding structure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a two-color injection molding structure;

[0029] Figure 2 This is a schematic diagram of the structure of a two-color injection molding device according to one embodiment of the present invention;

[0030] Figure 3 for Figure 2 A partial view of the two-color injection molding unit shown;

[0031] Figure 4 for Figure 2 Another partial view of the two-color injection molding apparatus shown;

[0032] Figure 5 for Figure 2 A partial cross-sectional view of the two-color injection molding apparatus shown.

[0033] Figure 6 for Figure 5 A partial enlarged view of point A in the two-color injection molding unit shown;

[0034] Figure 7 for Figure 2 A partial cross-sectional view of the two-color injection molding apparatus shown.

[0035] Figure 8 This is a partial cross-sectional view of a two-color injection molding device according to another embodiment of the present invention;

[0036] Figure 9 for Figure 8 Another partial cross-sectional view of the two-color injection molding apparatus shown. Detailed Implementation

[0037] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] This application provides a two-color injection molding apparatus. The two-color injection molding apparatus includes a movable mold and a pin assembly. The movable mold is configured to sequentially form a primary molding cavity or a secondary molding cavity during mold closing. The movable mold has a mounting through hole that communicates with the primary molding cavity. Further, the pin assembly is located at the mounting through hole and connected to the movable mold, with one end of the pin assembly extending into the primary molding cavity and sealing the end of the mounting through hole near the primary molding cavity. Further, in the direction from the end of the pin assembly near the primary molding cavity towards the other end, the outer diameter of the pin assembly located within the primary molding cavity decreases from large to small.

[0041] The aforementioned two-color injection molding device uses a movable mold as the carrier and moving part of the product molded in the primary molding cavity. A pin assembly is positioned at the mounting through-hole and connected to the movable mold. One end of the pin assembly extends into the primary molding cavity and seals the end of the mounting through-hole near the primary molding cavity. In the direction from the end of the pin assembly near the primary molding cavity to the other end, the outer diameter of the pin assembly within the primary molding cavity decreases from large to small. This allows the pin assembly to extend into the primary molding cavity and embed itself in the product molded within the cavity. Since the outer diameter of the end of the pin assembly near the primary molding cavity is larger than the outer diameter at other locations, mechanical interference occurs between the pin assembly and the product molded in the primary molding cavity, preventing the product from detaching from the pin assembly. This effectively reduces the likelihood of the product detaching from the movable mold within the primary molding cavity, thereby significantly improving the processing efficiency of the two-color injection molding structure.

[0042] To better understand the two-color injection molding apparatus of this application, the following further explanation is provided:

[0043] Please refer to the following: Figures 2 to 5One embodiment of the two-color injection molding apparatus 10 includes a movable mold 100 and a pin assembly 200. The movable mold 100 is configured to sequentially form a primary molding cavity 101 or a secondary molding cavity (not shown) during mold closing. The movable mold 100 has a mounting through hole 102 that communicates with the primary molding cavity 101. Further, the pin assembly 200 is located at the mounting through hole 102 and connected to the movable mold 100, with one end of the pin assembly 200 extending into the primary molding cavity 101 and sealing the end of the mounting through hole 102 near the primary molding cavity 101. Further, in the direction from the end of the pin assembly 200 near the primary molding cavity 101 towards the other end, the outer diameter of the pin assembly 200 located within the primary molding cavity 101 decreases from large to small.

[0044] The aforementioned two-color injection molding device 10 allows the movable mold 100 to serve as the carrier and moving part of the product being molded within the primary molding cavity 101. The pin pull assembly 200 is positioned at the mounting through hole 102 and connected to the movable mold 100. One end of the pin pull assembly 200 extends into the primary molding cavity 101 and is sealed at the end of the mounting through hole 102 near the primary molding cavity 101. In the direction from the end of the pin pull assembly 200 near the primary molding cavity 101 to the other end, the outer diameter of the pin pull assembly 200 within the primary molding cavity 101 decreases from large to small, thus ensuring that the pin pull assembly 200... The needle pin assembly 200 extends into the primary molding cavity 101 and causes it to be embedded in the product molded in the primary molding cavity 101. Since the outer diameter of the end of the needle pin assembly 200 near the primary molding cavity 101 is larger than the outer diameter of other positions of the needle pin assembly 200, mechanical interference occurs between the needle pin assembly 200 and the product molded in the primary molding cavity 101, preventing the product molded in the primary molding cavity 101 from detaching from the needle pin assembly 200. This effectively reduces the likelihood of the product molded in the primary molding cavity 101 detaching from the moving mold 100, thereby improving the processing efficiency of the two-color injection molding structure.

[0045] Please refer to the following: Figures 5 to 7In one embodiment, the pin-pulling assembly 200 includes a fixing member 210 and a pulling member 220. The fixing member 210 is disposed at the mounting through hole 102, and the end of the fixing member 210 near the primary molding cavity 101 is sealed in the mounting through hole 102. The fixing member 210 has a limiting through hole 201, which communicates with both the mounting through hole 102 and the primary molding cavity 101. The pulling member 220 passes through the limiting through hole 201 and the mounting through hole 102 and is connected to the fixing member 210. The end of the pulling member 220 that is sealed in the limiting through hole 201 near the primary molding cavity 101 extends into the primary molding cavity 101. Further, in the direction from the end of the pulling member 220 near the primary molding cavity 101 to the other end, the outer diameter of the pulling member 220 located in the primary molding cavity 101 decreases from large to small. It is understandable that since the tension member 220 needs to extend into the primary molding cavity 101 and leave a waste groove at the product formed in the primary molding cavity 101, the outer diameter of the tension member 220 cannot be set too large, otherwise it will affect the structural strength of the two-color injection molding structure. Therefore, in this application, the fixing member 210 is set at the mounting through hole 102, which is conducive to the stable installation of the tension member 220 on the moving mold 100 by the fixing member 210.

[0046] Please refer to the following: Figures 5 to 7In one embodiment, at least part of the end of the fixing member 210 near the primary molding cavity 101 extends into the primary molding cavity 101, and the end of the pulling member 220 near the primary molding cavity 101 protrudes from the end of the fixing member 210 near the primary molding cavity 101. Further, the projection of the pulling member 220 within the primary molding cavity 101 is within the projection of the fixing member 210 within the primary molding cavity 101, meaning the projection of the fixing member 210 within the primary molding cavity 101 covers the projection of the pulling member 220 within the primary molding cavity 101, and the peripheral wall of the fixing member 210 within the primary molding cavity 101 surrounds the peripheral wall of the pulling member 210 within the primary molding cavity 101. It is understandable that the pulling member 220 in the pin assembly 200 extends into the primary molding cavity 101. The outer diameter of the pulling member 220 within the primary molding cavity 101 decreases, causing mechanical interference between the pulling member 220 and the product being molded in the primary molding cavity 101. This prevents the product from detaching from the pulling member 220, effectively reducing the likelihood of the product detaching from the moving mold 100. However, due to this mechanical interference, when the product detaches from the pulling member 220, it is easy for the pulling member 220 to scrape against the product, resulting in a waste groove between the product and the corresponding part of the pulling member 220. Blinders are easily generated at the molding cavity 101, affecting the use of the two-color injection molding structure. In order to reduce the generation of blinders in the product molded in the molding cavity 101, in this application, at least one end of the fixing member 210 near the molding cavity 101 extends into the molding cavity 101. Thus, due to the presence of the fixing member 210, a groove is formed at the position occupied by the fixing member 210 in the product molded in the molding cavity 101. The groove is located on the outer periphery of the waste groove and is connected to the waste groove. In this way, the blinders formed at the waste groove are still a certain distance from the side of the product molded in the molding cavity 101, that is, the depth of the waste groove is reduced, thereby better reducing the generation of blinders in the product molded in the molding cavity 101 and better reducing the impact on the use of the two-color injection molding structure.

[0047] Please refer to the following: Figures 5 to 7 In one embodiment, the end face of the fixing member 210 near the primary molding cavity 101 is spaced apart from the cavity wall of the primary molding cavity 101. Furthermore, the end face of the pulling member 220 near the primary molding cavity 101 is spaced apart from the cavity wall of the primary molding cavity 101, thereby preventing the formation of through holes in the product formed in the primary molding cavity 101.

[0048] Please refer to the following: Figures 5 to 7In one embodiment, the pulling member 220 includes a sliding rod 221, a limiting block 222, and a pulling block 223. The sliding rod 221 is slidably connected to the limiting through hole 201 and the mounting through hole 102, and one end of the sliding rod 221 protrudes from the mounting through hole 102 away from the primary molding cavity 101. The other end of the sliding rod 221 is connected to the limiting block 222. Further, the pulling block 223 is disposed at one end of the limiting through hole 201 near the primary molding cavity 101. The limiting block 222 is slidably connected to the pulling block 223. One end of the pulling block 223 is rotatably connected to the fixing member 210, and the rotation axis of the pulling block 223 intersects the sliding direction of the sliding rod 221. The other end of the pulling block 223 extends at least partially into the primary molding cavity 101. In the direction from the end of the pulling block 223 near the primary molding cavity 101 to the other end, the outer diameter of the pulling block 223 decreases from large to small. Furthermore, when the sliding rod 221 moves the limiting block 222 to the end near the pulling block 223 close to the primary molding cavity 101, the pulling block 223 and the limiting block 222 together block the end of the limiting through hole 201 near the primary molding cavity 101, and the end of the pulling block 223 near the primary molding cavity 101 is clamped on the wall of the limiting block 222 and the limiting through hole 201; when the sliding rod 221 moves the limiting block 222 to the end near the pulling block 223 away from the primary molding cavity 101, the end of the pulling block 223 away from the primary molding cavity 101 is positioned away from the wall of the limiting through hole 201. Furthermore, the rotation axis of the pulling block 223 is perpendicular to the sliding direction of the sliding rod 221. Furthermore, the end of the pulling block 223 near the primary molding cavity 101 is spaced apart from the cavity wall of the primary molding cavity 101. Furthermore, the limiting block 222 is rotatably connected to the fixing member 210 via a rotating shaft. Furthermore, the end of the pulling block 223 away from the one-time molding cavity 101 is disposed in a way that avoids the limiting through hole 201. Furthermore, the side wall of the limiting through hole 201 is provided with a clearance groove, and the end of the pulling block 223 away from the one-time molding cavity 101 is disposed in a way that avoids the clearance groove.

[0049] Please refer to the following: Figures 5 to 7It is understandable that although the groove design can effectively reduce the generation of burrs and mitigate the impact of using two-color injection molding structures, in reality, the groove design will still cause burrs to be generated at the waste groove, especially for the brittle plastic materials used in two-color injection molding structures, where the generation of burrs is still more serious and affects the use of two-color injection molding structures. Therefore, in this application, the sliding rod 221 is slidably connected to the mounting through hole 102 and the limiting through hole 201, that is, the sliding rod 221 can drive the limiting block 222 to move towards and away from the primary molding cavity 101, and pull the block The end of the pull block 223 away from the primary molding cavity 101 is rotatably connected to the fixing member 210, so that the end of the pull block 223 near the primary molding cavity 101 can be swayed and set inside the primary molding cavity 101. When the sliding rod 221 drives the limiting block 222 to be set near the end of the pull block 223 near the primary molding cavity 101, the pull block 223 and the limiting block 222 together block the end of the limiting through hole 201 near the primary molding cavity 101, and the end of the pull block 223 near the primary molding cavity 101 is clamped on the wall of the limiting block 222 and the limiting through hole 201, so that it can be used in the primary molding cavity 101. During the molding process in the primary molding cavity 101, the limiting block 222 and the pulling block 223 together block the mounting through hole 102 and extend into the primary molding cavity 101, so that the limiting block 222 and the pulling block 223 are embedded in the product molded in the primary molding cavity 101. This effectively reduces the risk of the product molding in the primary molding cavity 101 detaching from the moving mold 100. After the two-color injection molded structure is obtained in the secondary molding cavity, the limiting block 222 moves away from the primary molding cavity 101, that is, away from the secondary molding cavity, so that the limiting block 222 is located in the pulling cavity. The portion of block 223 that is positioned to avoid the wall of the limiting through hole 201 allows the limiting block 222 and the wall of the limiting through hole 201 to have a certain position to allow the pulling block 223 to rotate. When the two-color injection molded structure detaches from the pulling block 223, the mechanical interference between the two-color injection molded structure and the pulling block 223 causes the pulling block 223 to rotate away from the two-color injection molded structure, or to rotate closer to the limiting block 222. This effectively reduces the friction and scratching of the pulling block 223 on the two-color injection molded structure, further reducing the generation of burrs. In one embodiment, the end of the limiting block 222 away from the sliding rod 221 protrudes from the end face of the pulling block 223 near the primary molding cavity 101.It is understandable that, since the limiting block 222 and the pulling block 223 together block the limiting through hole 201 and are embedded into the product molded in the one-time molding cavity 101, it is difficult to ensure a complete and seamless fit between the limiting block 222 and the pulling block 223. This makes it easy for plastic to overflow between the limiting block 222 and the pulling block 223. The overflowing plastic will hinder the rotation of the end of the pulling block 223 near the one-time molding cavity 101 towards the limiting block 222. This will result in a significant amount of burrs still being generated at the waste groove of the two-color injection molding structure, thus affecting the use of the two-color injection molding structure. Therefore, in this application, it is made... The end of the limiting block 222 away from the sliding rod 221 protrudes from the end face of the pulling block 223 close to the primary molding cavity 101. This ensures that the position of the limiting block 222 in the primary molding cavity 101 forms a step for falling relative to the pulling block 223. This also ensures that a groove is formed at the position corresponding to the limiting block 222 in the product molded in the primary molding cavity 101, that is, a groove is further formed at the bottom of the waste groove. This better ensures that the product molded in the primary molding cavity 101 and the end of the pulling block 223 close to the primary molding cavity 101 are properly positioned to avoid misalignment. This improves the rotational effectiveness of the pulling block 223 and thus effectively reduces the friction and scratches of the pulling block 223 on the two-color injection molding structure.

[0050] Please refer to the following: Figures 8 to 9 In one embodiment, the pulling block 223 is provided with a first wedge-shaped surface 202 on the side wall near the hole wall of the limiting through hole 201. The first wedge-shaped surface 202 is set away from the primary molding cavity 101, so that the outer diameter of the pulling block 223 located in the primary molding cavity 101 changes continuously. This is beneficial to further reduce the generation of burrs while ensuring that the product formed in the primary molding cavity 101 is removed from the moving mold 100.

[0051] Please refer to the following: Figures 8 to 9In one embodiment, there are two pulling blocks 223. Both pulling blocks 223 are disposed at one end of the limiting through hole 201 near the primary molding cavity 101. The two pulling blocks 223 are disposed opposite to each other on the two sides of the limiting block 222. Each pulling block 223 has a first wedge-shaped surface 202 on the side away from the limiting block 222. The first wedge-shaped surface 202 of each pulling block 223 is disposed away from the primary molding cavity 101. One end of each pulling block 223 is rotatably connected to the fixing member 210. The rotation axis of each pulling block 223 intersects the sliding direction of the sliding rod 221. The other end of each pulling block 223 extends at least partially into the primary molding cavity 101. The limiting block 222 is slidably connected between the two pulling blocks 223. Furthermore, when the sliding rod 221 moves the limiting block 222 to the end near the primary molding cavity 101 adjacent to the pull block 223, the two pull blocks 223 and the limiting block 222 together block the end of the limiting through hole 201 near the primary molding cavity 101, and the end of each pull block 223 near the primary molding cavity 101 is clamped on the wall of the limiting block 222 and the limiting through hole 201; when the sliding rod 221 moves the limiting block 222 to the end near the pull block 223 away from the primary molding cavity 101, the end of each pull block 223 away from the primary molding cavity 101 is offset from the wall of the limiting through hole 201. Furthermore, the opposite sides of the limiting block 222 opposite to the two pull blocks 223 are parallel. Furthermore, the opposite sides of the limiting block 222 opposite to the two pull blocks 223 are parallel to the direction of gravity. Furthermore, the two sides of the limiting block 222 that are opposite to the two pulling blocks 223 are parallel to the direction of gravity. That is, each side of the limiting block 222 that is opposite to the two pulling blocks 223 is parallel to the direction of gravity, which further effectively reduces the product formed in the molding cavity 101 from leaving the moving mold 100, thereby improving the processing efficiency of the two-color injection molding structure.

[0052] Please refer to the following: Figures 8 to 9In one embodiment, each pulling block 223 has an intersecting sliding surface 203 and a second wedge-shaped surface 204 on the side near the limiting block 222. The sliding surface 203 is located at the end of the pulling block 223 near the primary molding cavity 101, and the second wedge-shaped surface 204 is located at the end of the pulling block 223 away from the primary molding cavity 101. The sliding surface 203 is parallel to the sliding direction of the sliding rod 221, and the second wedge-shaped surface 204 is disposed towards the primary molding cavity 101. Furthermore, when the sliding rod 221 moves the limiting block 222 to the end of the adjacent pulling block 223 near the primary molding cavity 101, the sliding surfaces 203 of the two pulling blocks 223 are attached to the opposite side surfaces of the limiting block 222; when the sliding rod 221 moves the limiting block 222 to the end of the adjacent pulling block 223 away from the primary molding cavity 101, the limiting block 222 abuts against the second wedge-shaped surface 204 of each pulling block 223, and the end of each pulling block 223 near the primary molding cavity 101 rotates toward the direction near the limiting block 222, so that when the limiting block 222 slides away from the primary molding cavity 101, the pulling block 223 slides on the sliding surface 203. At this time, the limiting block 222 is displaced in the sliding direction and does not exert any force on the pulling block 223. Mechanical interference occurs, and then the pulling block 223 slides into the second wedge surface 204, where the second wedge surface 204 intersects with the sliding surface 203 and is positioned towards the primary molding cavity 101. At this time, the limiting block 222 is displaced in the sliding direction, and under the mechanical interference of the second wedge surface 204, the end of the pulling block 223 away from the primary molding cavity 101 is forced to move away from the limiting block 222. Consequently, the end of the pulling block 223 near the primary molding cavity 101 moves towards the limiting block 222. This causes the pulling block 223 to detach from the two-color injection molding structure. When the moving mold 100 drives the pulling block 223 to detach from the two-color injection molding structure, the friction and scratching between the two-color injection molding structure and the pulling block 223 are reduced, further effectively reducing the generation of burrs.

[0053] This application also provides a two-color injection molding process, performed using the two-color injection molding apparatus of any of the above embodiments. One embodiment of the two-color injection molding process includes the following steps: performing a primary injection molding process into a primary molding cavity to obtain a primary injection molded part; using a moving mold to move and close the primary injection molded part, so that the primary injection molded part is housed in a secondary molding cavity; performing a secondary injection molding process into the secondary molding cavity to obtain a two-color injection molded structure; and performing a demolding process on the two-color injection molded structure to detach the two-color injection molded structure from the pin assembly.

[0054] The aforementioned two-color injection molding process utilizes a pin assembly to seal the mounting through hole and extend into the primary molding cavity, thereby embedding the pin assembly within the primary injection molded part and causing mechanical interference with it. This effectively reduces the likelihood of the product being ejected from the moving mold within the primary molding cavity, thus significantly improving the processing efficiency of the two-color injection molding structure.

[0055] To better understand the two-color injection molding process of this application, the following further explanation is provided. One embodiment of the two-color injection molding process includes the following steps:

[0056] S100. Perform a single injection molding process into the primary molding cavity to obtain a one-piece injection molded part. This involves sealing the mounting through-hole with the pin assembly and extending it into the primary molding cavity for conventional plastic injection and cooling molding. This plastic injection and cooling molding is a relatively standard operation and will not be elaborated upon here. The pin assembly is embedded within the one-piece injection molded part and mechanically interferes with it, effectively reducing the likelihood of the molded product detaching from the moving mold within the primary molding cavity, thereby significantly improving the processing efficiency of the two-color injection molding structure.

[0057] S200. A moving mold is used to move and close the primary injection molded part so that the primary injection molded part is housed in the secondary molding cavity. This means that the primary injection molded part is transferred via the moving mold, such as by rotating it 180° and then closing the mold to form the secondary molding cavity. This can be achieved with a relatively conventional structure, such as a robotic arm, and will not be elaborated upon here.

[0058] S300. Perform a secondary injection molding process into the secondary molding cavity to obtain a two-color injection molded structure. This secondary injection molding process involves injecting and cooling plastic into the secondary molding cavity, a relatively standard operation that will not be elaborated upon here. This process yields the two-color injection molded structure.

[0059] S400: Demolding process is performed on the two-color injection molded structure to allow the two-color injection molded structure to detach from the pin assembly.

[0060] The aforementioned two-color injection molding process utilizes a pin assembly to seal the mounting through hole and extend into the primary molding cavity, thereby embedding the pin assembly within the primary injection molded part and causing mechanical interference with it. This effectively reduces the likelihood of the product being ejected from the moving mold within the primary molding cavity, thus significantly improving the processing efficiency of the two-color injection molding structure.

[0061] Please refer to the following: Figures 8 to 9In one embodiment, prior to the step of performing a primary injection molding process into the primary molding cavity 101, the two-color injection molding process further includes the following steps: sealing the pin assembly 200 so that the pin assembly 200 is sealed at the end of the mounting through hole 102 near the primary molding cavity 101, and such that the pin assembly 200 extends at least partially into the primary molding cavity 101. Furthermore, the sliding rod 221 is moved toward the primary molding cavity 101, so that the sliding rod 221 drives the limiting block 222 to move toward the molding cavity until it and the pulling block 223 together block the end of the mounting through hole 102 near the primary molding cavity 101. The limiting block 222 and the pulling block 223 both partially extend into the primary molding cavity 101, and the pulling block 223 is sandwiched between the hole wall of the limiting through hole 201 and the limiting block 222, which further effectively reduces the product formed in the primary molding cavity 101 from leaving the moving mold 100, thereby improving the processing efficiency of the two-color injection molding structure.

[0062] Please refer to the following: Figures 8 to 9 In one embodiment, the demolding process of the two-color injection molded structure is performed as follows: the sliding rod 221 is driven to move away from the primary molding cavity 101, so that the sliding rod 221 drives the limiting block 222 to move away from the primary molding cavity 101. Further, the sliding rod 221 drives the limiting block 222 to slide at least partially to the second wedge surface 204, and the limiting block 222 pushes the end of the pulling member 220 near the primary molding cavity 101 to rotate towards the limiting block 222, thereby causing the pulling member 220 to move away from the primary injection molded part to detach from the two-color injection molded structure. Then, the moving mold 100 is driven to move the pulling member 220 away from the two-color injection molded structure until the moving mold 100 and the pulling member 220 detach from the two-color injection molded structure together. When the moving mold 100 drives the pulling block 223 to detach from the two-color injection molded structure, the friction and scratching between the two-color injection molded structure and the pulling block 223 are reduced, further effectively reducing the generation of burrs.

[0063] This application also discloses a two-color injection molded structure, prepared using the two-color injection molding process of any of the above embodiments. Further, the two-color injection molded structure is obtained by injection molding using the two-color injection molding apparatus described in any of the above embodiments, so that a waste groove is formed on the two-color injection molded structure. The groove wall of the waste groove is provided with a wedge-shaped surface, and the wedge-shaped surface is positioned facing the bottom of the waste groove. Further, in this embodiment, the two-color injection molding apparatus 10 includes a movable mold 100 and a pin assembly 200. The movable mold 100 is configured to sequentially form a primary molding cavity 101 or a secondary molding cavity (not shown) during mold closing. The movable mold 100 is provided with a mounting through hole 102, which communicates with the primary molding cavity 101. Further, the pin assembly 200 is disposed at the mounting through hole 102 and connected to the movable mold 100, and one end of the pin assembly 200 extends into the primary molding cavity 101 and seals the end of the mounting through hole 102 near the primary molding cavity 101. Furthermore, in the direction from one end of the pin assembly 200 near the primary molding cavity 101 toward the other end, the outer diameter of the pin assembly 200 located in the primary molding cavity 101 decreases from large to small, effectively improving the processing efficiency of the two-color injection molding structure.

[0064] Compared with the prior art, the present invention has at least the following advantages:

[0065] The two-color injection molding device 10 of this utility model allows the movable mold 100 to serve as the carrier and moving part of the product being molded within the primary molding cavity 101. The pin pull assembly 200 is located at the mounting through hole 102 and connected to the movable mold 100. One end of the pin pull assembly 200 extends into the primary molding cavity 101 and is sealed at the end of the mounting through hole 102 near the primary molding cavity 101. From the end of the pin pull assembly 200 near the primary molding cavity 101 towards the other end, the outer diameter of the pin pull assembly 200 within the primary molding cavity 101 decreases from large to small, thus ensuring that the pin pull assembly 200... The pin assembly 200 extends into the primary molding cavity 101, causing it to be embedded in the product molded within the primary molding cavity 101. Since the outer diameter of the end of the pin assembly 200 near the primary molding cavity 101 is larger than the outer diameter at other locations, mechanical interference occurs between the pin assembly 200 and the product molded within the primary molding cavity 101, preventing the product from detaching from the pin assembly 200. This effectively reduces the likelihood of the product detaching from the moving mold 100, thereby improving the processing efficiency of the two-color injection molding structure.

[0066] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A two-color injection molding device, characterized in that, include: A movable mold, configured to sequentially form a primary molding cavity or a secondary molding cavity during mold closing, wherein the movable mold is provided with a mounting through hole that communicates with the primary molding cavity; A pin-pulling assembly is provided at the mounting through hole and connected to the movable mold, and one end of the pin-pulling assembly extends into the primary molding cavity and is sealed at the end of the mounting through hole near the primary molding cavity; In the direction from one end of the pin assembly near the primary molding cavity to the other end, the outer diameter of the pin assembly located within the primary molding cavity decreases from large to small.

2. The two-color injection molding apparatus according to claim 1, characterized in that, The pin assembly includes a fixing member and a pulling member. The fixing member is disposed at the mounting through hole, and the end of the fixing member near the primary molding cavity is sealed in the mounting through hole. The fixing member is provided with a limiting through hole, which communicates with the mounting through hole and the primary molding cavity respectively. The pulling member passes through the limiting through hole and the mounting through hole respectively and is connected to the fixing member. The end of the pulling member that is sealed in the limiting through hole near the primary molding cavity extends into the primary molding cavity. In the direction from one end of the pulling member near the primary molding cavity to the other end, the outer diameter of the pulling member located in the primary molding cavity decreases from large to small.

3. The two-color injection molding apparatus according to claim 2, characterized in that, The fixing member has at least a partial extension into the primary molding cavity at one end near the primary molding cavity, and the pulling member has its end near the primary molding cavity protruding from the fixing member's end near the primary molding cavity; and / or, The end face of the fixing member near the primary molding cavity is spaced apart from the cavity wall of the primary molding cavity; and / or, The end face of the pulling member near the primary molding cavity is spaced apart from the cavity wall of the primary molding cavity.

4. The two-color injection molding apparatus according to claim 2, characterized in that, The pulling component includes a sliding rod, a limiting block, and a pulling block. The sliding rod is slidably connected to the limiting through hole and the mounting through hole, and one end of the sliding rod protrudes from the mounting through hole away from the one-time molding cavity, while the other end of the sliding rod is connected to the limiting block. The pulling block is disposed at one end of the limiting through hole near the primary molding cavity. The limiting block is slidably connected to the pulling block. One end of the pulling block is rotatably connected to the fixing member. The rotation axis of the pulling block intersects the sliding direction of the sliding rod. The other end of the pulling block extends at least partially into the primary molding cavity. In the direction from the end of the pulling block near the primary molding cavity to the other end, the outer diameter of the pulling block decreases from large to small. When the sliding rod moves the limiting block to the end near the pulling block close to the primary molding cavity, the pulling block and the limiting block together block the end of the limiting through hole close to the primary molding cavity, and the end of the pulling block close to the primary molding cavity is clamped on the wall of the limiting block and the limiting through hole; when the sliding rod moves the limiting block to the end away from the primary molding cavity, the end of the pulling block away from the primary molding cavity is positioned away from the wall of the limiting through hole.

5. The two-color injection molding apparatus according to claim 4, characterized in that, The end of the limiting block away from the sliding rod protrudes from the end face of the pulling block near the primary forming cavity.

6. The two-color injection molding apparatus according to claim 4, characterized in that, The pulling block has a first wedge-shaped surface on the side wall near the limiting through hole, and the first wedge-shaped surface is set away from the one-time forming cavity.

7. The two-color injection molding apparatus according to claim 6, characterized in that, The number of the pulling blocks is two, and both pulling blocks are disposed at one end of the limiting through hole near the primary molding cavity. The two pulling blocks are disposed opposite to each other on the two sides of the limiting block. Each pulling block has a first wedge-shaped surface on the side away from the limiting block. The first wedge-shaped surface of each pulling block is disposed away from the primary molding cavity, and one end of each pulling block is rotatably connected to the fixing member. The rotation axis of each pulling block intersects the sliding direction of the sliding rod. The other end of each pulling block extends at least partially into the primary molding cavity. The limiting block is slidably connected between the two pulling blocks. When the sliding rod moves the limiting block to the end near the pull block close to the primary molding cavity, the two pull blocks and the limiting block together block the end of the limiting through hole close to the primary molding cavity, and the end of each pull block close to the primary molding cavity is clamped on the wall of the limiting block and the limiting through hole; when the sliding rod moves the limiting block to the end away from the primary molding cavity, the end of each pull block away from the primary molding cavity is positioned away from the wall of the limiting through hole.

8. The two-color injection molding apparatus according to claim 7, characterized in that, Each of the pulling blocks has an intersecting sliding surface and a second wedge-shaped surface on the side near the limiting block. The sliding surface is located at the end of the pulling block near the primary molding cavity, and the second wedge-shaped surface is located at the end of the pulling block away from the primary molding cavity. The sliding surface is parallel to the sliding direction of the sliding rod, and the second wedge-shaped surface is oriented towards the primary molding cavity. When the sliding rod moves the limiting block to the end near the end of the pulling block close to the primary molding cavity, the sliding surfaces of the two pulling blocks are attached to the opposite side surfaces of the limiting block; when the sliding rod moves the limiting block to the end near the end of the pulling block away from the primary molding cavity, the limiting block abuts against the second wedge-shaped surface of each pulling block, and the end of each pulling block near the primary molding cavity rotates toward the direction close to the limiting block.

9. The two-color injection molding apparatus according to claim 7, characterized in that, The two sides of the limiting block and the two pulling blocks are parallel to the direction of gravity.

10. A two-color injection molding structure, characterized in that, The two-color injection molding apparatus according to any one of claims 1 to 9 is used to form a waste groove on the two-color injection molding structure, wherein the wall of the waste groove is provided with a wedge-shaped surface and the wedge-shaped surface is disposed facing the bottom of the waste groove.

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