Double-color plastic product injection mold

Abstract

The double-color plastic product injection mold comprises an outer plate, the middle of the upper end of the outer plate is fixedly connected with a material guiding block and two supporting plates, the upper ends of the material guiding block and the supporting plates are jointly and fixedly connected with a lower forming plate, and the middle of the lower forming plate protrudes upwards to form a protrusion; an outer forming structure and inner forming plates are arranged at the upper end of the lower forming plate, a forming inner core is arranged in the outer forming structure, and the two inner forming plates are movably arranged at the left end and the right end of the outer forming structure in a penetrating mode correspondingly; the two inner forming plates are matched with the lower end of the forming inner core; and pressurizing structures are fixedly connected to the outer side faces of the two inner forming plates correspondingly, and the two pressurizing structures are movably connected with the left supporting plate and the right supporting plate in a penetrating and inserting mode correspondingly. The pressure between the second injection molding raw material and the first injection molding raw material can be increased, so that the second injection molding raw material and the first injection molding raw material are fused more tightly, the injection molding raw materials in two colors can be effectively prevented from being separated from each other after injection molding, and the quality of a finished product is better.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and particularly to two-color plastic product injection molds. Background Technology

[0002] Two-color plastic products are a type of product made by injection molding two different colored raw materials. During injection molding, the first colored raw material is first injected into the mold and allowed to cool and solidify initially. Then, the second colored raw material is injected, and the heat from the second colored raw material melts the junction between the first and second raw materials, causing them to fuse together and form a single unit. After both raw materials have cooled and solidified, the finished injection molded product is formed.

[0003] In the injection molding process of two-color plastic products, there may be issues with the first and second injection molding materials not fusing properly. This can lead to separation of the first and second color materials in the molded product, posing a risk to the quality of the finished product. Therefore, we propose the concept of two-color plastic product injection molds. Summary of the Invention

[0004] The main objective of this invention is to provide a two-color injection mold for plastic products, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A two-color plastic product injection mold includes an outer plate. A guide block and support plates are fixedly connected to the upper center of the outer plate. Two support plates are provided, located on the left and right sides of the guide block, respectively. A lower molding plate is fixedly connected to the upper ends of the guide block and support plates. The middle of the lower molding plate protrudes upwards to form a bulge. An outer molding structure and an inner molding plate are provided at the upper end of the lower molding plate. A molding core is provided inside the outer molding structure. Two inner molding plates are provided, movably inserted through the left and right ends of the outer molding structure. Both inner molding plates mate with the lower ends of the molding core. Pressure structures are fixedly connected to the outer surfaces of both inner molding plates, and the two pressure structures are movably connected to the left and right support plates, respectively. The cavity formed by the outer molding structure, molding core, and two inner molding plates is used for injection molding of a first type of injection molding material. After the first type of injection molding material is injection molded, the cavity formed by the first injection molding structure, outer molding structure, molding core, two inner molding plates, and lower molding plate is used for injection molding of a second type of injection molding material.

[0007] Preferably, the lower forming plate has a first guide hole that runs vertically through the middle, the guide block has a second guide hole that runs vertically through the middle, and the outer plate has a first injection hole that runs vertically through the middle. The first guide hole, the second guide hole, and the first injection hole are coaxially arranged. The lower inner side of the two inner forming plates is provided with a pusher groove. The two pusher grooves are arranged symmetrically from left to right. The pusher grooves divide the inner end face of the inner forming plate into two vertical surfaces and an inclined surface that slopes outward from the bottom to connect the upper and lower vertical surfaces. The two inclined surfaces are arranged in an inverted V shape. The two pusher grooves cooperate with the first guide hole.

[0008] Preferably, the pressurizing structure includes a connecting plate and a transmission frame. The connecting plate is fixed to the outer end face of the inner forming plate. The transmission frame is a U-shaped frame with one end longer than the other. The shorter end of the transmission frame is fixed to the end of the connecting plate away from the inner forming plate. The longer end of the transmission frame moves through the left and right end faces of the support plate and extends between the left and right support plates. A nut is threaded to the end of the longer end of the transmission frame. A spring is sleeved on the transmission frame, and the spring is located between the nut and the support plate.

[0009] Preferably, each pressurizing structure includes two transmission frames located on the front and rear sides of the guide block, respectively, and two springs located on the same side of the guide block are spaced apart.

[0010] Preferably, the outer molding structure includes an outer molding mold, the lower end of which is open, a molding core fixed to the upper inner wall of the outer molding mold, the molding core and the four vertical walls of the outer molding mold being spaced apart, a flow channel being provided on the upper inner wall of the outer molding mold, the flow channel being connected to the vertical walls of the outer molding mold, a second injection hole being provided at the upper end of the outer molding mold, the second injection hole being connected to the flow channel; and baffles being fixedly connected to the lower front and lower rear of the outer molding mold.

[0011] Preferably, the front and rear baffles abut against the upper front and upper rear parts of the lower forming plate, respectively, and the inner sides of the front and rear baffles abut against the front and rear ends of the protrusion on the lower forming plate, respectively; the upper and lower ends of the inner forming plate abut against the lower end of the outer forming mold and the upper end of the lower forming plate, respectively, and the front and rear ends of the inner forming plate abut against the inner sides of the front and rear baffles, respectively.

[0012] Preferably, a support column is fixedly connected to the upper end of the outer panel, and the support column is fixed to the lower end of the lower forming plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] During the injection molding of the first type of injection molding material, the inner sides of the two inner molding plates abut together, and the molding core abuts against the upper ends of the two inner molding plates. The first type of injection molding material enters the cavity formed by the outer molding structure, the molding core, and the two inner molding plates through the outer molding structure, where it undergoes initial cooling and molding. Then, the second type of injection molding material is injected into the first injection hole and enters the two ejector grooves through the second guide hole and the first guide hole. As the second type of injection molding material is gradually injected, the two ejector grooves are pushed open, causing the two inner molding plates to slide left and right respectively. This allows the second type of injection molding material to gradually come into contact with the first type of injection molding material, melting the first type and forming a single unit. As the two inner molding plates move to the left and right, the pressure exerted on them by the two pressing structures gradually increases, slowing down their movement. This increases the pressure on the second injection molding material, leading to a greater pressure between the second and first injection molding materials. This results in a tighter fusion between the two materials, creating a stronger bond at the color interface after injection molding. The resulting two-color rubber product has greater structural strength and effectively prevents the two colors from separating after injection molding, leading to better finished product quality. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the two-color plastic product injection mold of the present invention;

[0016] Figure 2 This is a cross-sectional view of the two-color plastic product injection mold of the present invention when the mold is closed;

[0017] Figure 3 This is a cross-sectional view of the structure of the two-color plastic product injection mold of the present invention;

[0018] Figure 4 This is a partial structural cross-sectional view of the two-color plastic product injection mold of the present invention;

[0019] Figure 5 This is a schematic diagram of the pressure structure of the two-color plastic product injection mold of the present invention;

[0020] Figure 6 This is a schematic diagram showing the arrangement of the two inner forming plates in the two-color plastic product injection mold of the present invention;

[0021] Figure 7 This is a cross-sectional view of the external molding structure of the two-color plastic product injection mold of the present invention.

[0022] Figure 8This is a schematic diagram of the structure of the two-color plastic product injection mold of the present invention during the molding of two-color plastic products.

[0023] In the diagram: 1. Outer plate; 101. Injection hole No. 1; 2. Support column; 3. Support plate; 4. Lower molding plate; 41. Guide hole No. 1; 5. Pressurizing structure; 6. Inner molding plate; 61. Push groove; 7. Outer molding structure; 8. Molding core; 9. Guide block; 91. Guide hole No. 2; 51. Connecting plate; 52. Transmission frame; 53. Nut; 54. Spring; 71. Molding outer mold; 72. Baffle; 73. Flow groove; 74. Injection hole No. 2. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] like Figure 1-8As shown, a two-color plastic product injection mold includes an outer plate 1. A guide block 9 and a support plate 3 are fixedly connected to the upper middle part of the outer plate 1. Two support plates 3 are provided and are located on the left and right sides of the guide block 9, respectively. The upper ends of the guide block 9 and the support plate 3 are fixedly connected to a lower molding plate 4. The middle part of the lower molding plate 4 protrudes upward to form a protrusion. An outer molding structure 7 and an inner molding plate 6 are provided at the upper end of the lower molding plate 4. A molding core 8 is provided inside the outer molding structure 7. Two inner molding plates 6 are provided and are movably inserted through the left and right ends of the outer molding structure 7, respectively. Both inner molding plates 6 are engaged with the lower end of the molding core 8. A pressure structure 5 is fixedly connected to the outer surface of both inner molding plates 6. The two pressure structures 5 are movably connected to the left and right support plates 3, respectively.

[0028] The lower forming plate 4 has a first guide hole 41 that runs vertically through the middle, the guide block 9 has a second guide hole 91 that runs vertically through the middle, and the outer plate 1 has a first injection hole 101 that runs vertically through the middle. The first guide hole 41, the second guide hole 91 and the first injection hole 101 are coaxially arranged. The lower inner side of the two inner forming plates 6 are provided with push grooves 61. The two push grooves 61 are arranged symmetrically from left to right. The push grooves 61 divide the inner end face of the inner forming plate 6 into two vertical surfaces and an inclined surface that slopes outward from the bottom to connect the upper and lower vertical surfaces. The two inclined surfaces are arranged in an inverted V shape. The two push grooves 61 cooperate with the first guide hole 41.

[0029] The cavity formed by the outer molding structure 7, the molding core 8, and the two inner molding plates 6 is used for the injection molding of the first injection molding material; after the first injection molding material is injection molded, the cavity formed by the injection molding structure of the first injection molding material, the outer molding structure 7, the molding core 8, the two inner molding plates 6, and the lower molding plate 4 is used for the injection molding of the second injection molding material. Specifically, during the injection molding of the first type of injection molding material, the inner sides of the two inner molding plates 6 abut together, and the molding core 8 abuts against the upper ends of the two inner molding plates 6. The first type of injection molding material enters the cavity formed by the outer molding structure 7, the molding core 8, and the two inner molding plates 6 through the outer molding structure 7, undergoing preliminary cooling and molding. Then, the second type of injection molding material is injected into the first injection hole 101, and enters the two pusher grooves 61 through the second guide hole 91 and the first guide hole 41. As the second type of injection molding material is gradually injected, the two pusher grooves 61 are pushed open, causing the two inner molding plates 6 to slide to the left and right respectively, so that the second type of injection molding material gradually comes into contact with the first type of injection molding material and melts the first type of injection molding material, so that the second type of injection molding material and the first type of injection molding material... A single injection molding material is formed. As the two inner molding plates 6 move to the left and right, the pressure exerted by the two pressure structures 5 on the two inner molding plates 6 gradually increases, slowing down the movement of the two inner molding plates 6 to the left and right. This causes the pressure on the injected second injection molding material to gradually increase, resulting in a greater pressure between the second and first injection molding materials. This leads to a tighter fusion between the two materials, resulting in a stronger bond at the interface between the two colors after injection molding. The resulting two-color rubber product has greater structural strength and effectively prevents the two colors from separating after injection molding, resulting in better finished product quality.

[0030] During the injection molding process of the second type of injection molding material, when the two inner molding plates 6 on the left and right sides move to their respective extreme positions, the injection pressure of the second type of injection molding material is maintained for a period of time. After the second type of injection molding material has initially cooled and solidified, the injection pressure of the second type of injection molding material can be reduced to zero. Then, the entire two-color plastic product injection mold is kept in the injection molding state for a period of time to solidify the first and second types of injection molding materials. Then, the mold is opened and the solidified finished product is taken out.

[0031] As a further explanation of the above technical solution, the pressurizing structure 5 includes a connecting plate 51 and a transmission frame 52. The connecting plate 51 is fixed to the outer end face of the inner forming plate 6. The transmission frame 52 is a U-shaped frame with one end longer than the other. The shorter end of the transmission frame 52 is fixed to the end of the connecting plate 51 that is away from the inner forming plate 6. The longer end of the transmission frame 52 moves through the left and right end faces of the support plate 3 and extends between the left and right support plates 3. Specifically, for the left and right pressurizing structures 5, the left and right connecting plates 51 are fixedly connected to the outer surfaces of the left and right inner forming plates 6 respectively, and the transmission frames 52 on the left and right sides move through the left and right support plates 3 respectively.

[0032] A nut 53 is threaded onto the longer end of the transmission frame 52. A spring 54 is fitted onto the transmission frame 52, located between the nut 53 and the support plate 3. During the injection molding process of the second injection molding material, the inner molding plate 6 slides outward, driving the corresponding transmission frame 52 to slide outward relative to the support plate 3 via the connecting plate 51. This causes the nut 53 on the transmission frame 52 to move towards the corresponding support plate 3, compressing the spring 54. The compressed spring 54 then reacts through the nut 53 onto the transmission frame 52 and applies a force opposite to the sliding direction of the inner molding plate 6 via the connecting plate 51, reducing the outward sliding speed of the inner molding plate 6. This increases the difficulty for the second injection molding material to push away the inner molding plate 6, thereby pressurizing the second injection molding material and increasing the pressure between the second and first injection molding materials. This promotes the fusion of the second and first injection molding materials, thereby improving the structural strength of the obtained two-color rubber product.

[0033] It should be noted that each pressurizing structure 5 includes two transmission frames 52 located on the front and rear sides of the guide block 9, and two springs 54 located on the same side of the guide block 9 are spaced apart, so that the two inner forming plates 6 on the left and right remain stable during the outward sliding process.

[0034] As a further explanation of the above technical solution, the outer molding structure 7 includes an outer molding mold 71, the lower end of which is open. An inner molding core 8 is fixed to the upper inner wall of the outer molding mold 71. The inner molding core 8 and the four vertical walls of the outer molding mold 71 are spaced apart. The cavity formed by the inner molding core 8 and the outer molding mold 71 is used for injection molding of the first type of injection molding material. A flow channel 73 is provided on the upper inner wall of the outer molding mold 71, connecting to the vertical walls of the outer molding mold 71. A second injection hole 74 is provided at the upper end of the outer molding mold 71, communicating with the flow channel 73. When injecting the first type of injection molding material, the first type of injection molding material is injected through the second injection hole 74 and flows into the cavity formed by the inner molding core 8 and the outer molding mold 71 via the flow channel 73 for molding. Baffles 72 are fixedly connected to both the front and rear lower ends of the outer molding mold 71.

[0035] The front and rear baffles 72 abut against the upper front and upper rear parts of the lower forming plate 4, respectively, and the inner sides of the front and rear baffles 72 abut against the front and rear ends of the protrusions on the lower forming plate 4, respectively; the upper and lower ends of the inner forming plate 6 abut against the lower end of the outer forming mold 71 and the upper end of the lower forming plate 4, respectively, and the front and rear ends of the inner forming plate 6 abut against the inner sides of the front and rear baffles 72, respectively.

[0036] The upper end of the outer panel 1 is fixedly connected to a support column 2, which is fixed to the lower end of the lower forming plate 4.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A two-color plastic product injection mold, comprising an outer panel (1), characterized in that: The upper middle part of the outer plate (1) is fixedly connected to a guide block (9) and a support plate (3). There are two support plates (3) located on the left and right sides of the guide block (9). The upper ends of the guide block (9) and the support plate (3) are fixedly connected to a lower forming plate (4). The middle part of the lower forming plate (4) protrudes upward to form a protrusion. The upper end of the lower forming plate (4) is provided with an outer forming structure (7) and an inner forming plate (6). The outer forming structure (7) is provided with a forming core (8). There are two inner forming plates (6) that are movably inserted through the left and right ends of the outer forming structure (7). The plates (6) are all fitted to the lower end of the molding core (8); a pressure structure (5) is fixedly connected to the outer side of the two inner molding plates (6), and the two pressure structures (5) are respectively connected to the left and right support plates (3); the cavity formed by the outer molding structure (7), the molding core (8) and the two inner molding plates (6) is used for the injection molding of the first injection molding material; after the first injection molding material is injection molded, the cavity formed by the injection molding structure of the first injection molding material, the outer molding structure (7), the molding core (8), the two inner molding plates (6) and the lower molding plate (4) is used for the injection molding of the second injection molding material.

2. The two-color plastic product injection mold according to claim 1, characterized in that: The lower forming plate (4) has a first guide hole (41) that runs vertically through the middle, the guide block (9) has a second guide hole (91) that runs vertically through the middle, and the outer plate (1) has a first injection hole (101) that runs vertically through the middle. The first guide hole (41), the second guide hole (91) and the first injection hole (101) are coaxially arranged. The lower inner side of the two inner forming plates (6) is provided with a pusher groove (61). The two pusher grooves (61) are arranged symmetrically from left to right. The pusher grooves (61) divide the inner end face of the inner forming plate (6) into two vertical surfaces and an inclined surface that connects the upper and lower vertical surfaces and slopes outward from the bottom. The two inclined surfaces are arranged in an inverted V shape. The two pusher grooves (61) cooperate with the first guide hole (41).

3. The two-color plastic product injection mold according to claim 1, characterized in that: The pressurizing structure (5) includes a connecting plate (51) and a transmission frame (52). The connecting plate (51) is fixed to the outer end face of the inner forming plate (6). The transmission frame (52) is a U-shaped frame with one end longer than the other. The shorter end of the transmission frame (52) is fixed to the end of the connecting plate (51) away from the inner forming plate (6). The longer end of the transmission frame (52) moves through the left and right end faces of the support plate (3) and extends between the left and right support plates (3). The end of the longer end of the transmission frame (52) is threaded with a nut (53). A spring (54) is sleeved on the transmission frame (52). The spring (54) is located between the nut (53) and the support plate (3).

4. The two-color plastic product injection mold according to claim 2, characterized in that: Each of the pressurizing structures (5) includes two transmission frames (52) located on the front and rear sides of the guide block (9) respectively, and two springs (54) located on the same side of the guide block (9) are spaced apart.

5. The two-color plastic product injection mold according to claim 4, characterized in that: The outer forming structure (7) includes an outer forming mold (71), the lower end of which is open. The inner forming core (8) is fixed on the upper inner wall of the outer forming mold (71). The inner forming core (8) is spaced apart from the four vertical walls of the outer forming mold (71). A flow channel (73) is provided on the upper inner wall of the outer forming mold (71). The flow channel (73) is connected to the vertical walls of the outer forming mold (71). A second injection hole (74) is provided at the upper end of the outer forming mold (71). The second injection hole (74) is connected to the flow channel (73). A baffle (72) is fixedly connected to the front and rear parts of the lower end of the outer forming mold (71).

6. The two-color plastic product injection mold according to claim 5, characterized in that: The front and rear baffles (72) abut against the front and rear upper parts of the lower forming plate (4) respectively, and the inner sides of the front and rear baffles (72) abut against the front and rear ends of the protrusion on the lower forming plate (4) respectively; the upper and lower ends of the inner forming plate (6) abut against the lower end of the outer forming mold (71) and the upper end of the lower forming plate (4) respectively, and the front and rear ends of the inner forming plate (6) abut against the inner sides of the front and rear baffles (72) respectively.

7. The two-color plastic product injection mold according to claim 1, characterized in that: The upper end of the outer plate (1) is fixedly connected to a support column (2), and the support column (2) is fixed to the lower end of the lower forming plate (4).

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