Injection mold for forming double-color product
By introducing a two-stage lifting and adjusting mechanism into the two-color injection mold, the problem of product defects caused by temperature changes inside the mold was solved, and efficient and precise thickness adjustment of two-color products was achieved, improving processing quality and efficiency.
Patent Information
- Application Number
- CN202520218458.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-12
AI Technical Summary
Existing two-color injection molds require two sets of molds to complete the injection of two colors. After each injection, the blank needs to be removed, resulting in large temperature changes inside and outside the mold cavity, causing product defects, difficulty in adjusting thickness, and affecting processing quality.
A two-stage lifting and adjusting mechanism is adopted. The height position of the pressure plate is controlled by the first and second lifting cylinders to achieve precise adjustment of the pressure plate during the two injection processes, ensuring the consistency of the thickness of the two colors.
It improves the processing efficiency and quality of two-color products, avoids injection molding failures caused by incorrect pressure plate position, and ensures the thickness consistency and tight fit of two-color products.
Smart Images
Figure CN223644168U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an injection mold for molding two-color products. Background Technology
[0002] Two-color molding refers to the injection molding of two different plastic materials on the same injection molding machine, resulting in two separate molding processes, but the product only exits the mold once. This molding process is also generally called two-material injection molding. It is usually completed using a single mold and requires a dedicated two-color injection molding machine.
[0003] Plastic injection molding machines are widely used in the production of plastic products. Plastic products that use two different types of plastics and whose two types of plastics can be clearly distinguished on the product are called two-color products. The mold that is installed on the same injection molding machine with two sets of injection molding devices (i.e., a two-color injection molding machine) and injects the two types of plastics in sequence to produce two-color products is called a two-color mold. Two-color plastic products are generally molded by injection molding machines.
[0004] Existing two-color injection molds require two sets of molds to complete the injection of two colors. After each injection of one type of material, the blank needs to be removed. Due to the large temperature difference between the inside and outside of the mold cavity, the blank will shrink significantly, resulting in defective final products. It is difficult to guarantee the thickness of each color injection molded product and difficult to adjust the thickness. Summary of the Invention
[0005] The purpose of this utility model is to provide an injection mold for molding two-color products, including a mold, an internal mold cavity, a pressure regulating plate movably disposed inside the mold cavity, a first injection port and a second injection port communicating with the mold cavity on the side of the mold, the first injection port and the second injection port being arranged vertically, the second injection port being connected to the lowest point of the mold cavity, an opening at the top of the mold cavity, a cover plate on the opening, a two-stage lifting adjustment mechanism on the cover plate, the two-stage lifting adjustment mechanism being connected to the pressure regulating plate, the two lifting strokes of the two-stage lifting adjustment mechanism corresponding to the height positions of the first injection port and the second injection port respectively.
[0006] Preferably, the two-stage lifting adjustment mechanism includes a bracket, a mounting plate, a first lifting cylinder, and a second lifting cylinder. The bracket is mounted on the cover plate, the first lifting cylinder is mounted on the bracket, the bottom of the first lifting cylinder is provided with a first piston rod, the mounting plate is fixedly mounted on the first piston rod, the mounting plate is fixedly mounted with a second lifting cylinder, the bottom of the second lifting cylinder is provided with a second piston rod, and the lower end of the second piston rod extends into the mold cavity and is fixedly connected to the pressure regulating plate.
[0007] Preferably, the lifting stroke of the first lifting cylinder corresponds to the distance from the mold cavity opening to the first injection port.
[0008] Preferably, the lifting stroke of the second lifting cylinder corresponds to the distance from the first injection port to the bottom surface of the mold cavity.
[0009] Preferably, the bottom surface of the cover plate is provided with a storage groove, which is adapted to the pressure regulating plate.
[0010] The advantages and beneficial effects of this utility model are as follows:
[0011] This utility model discloses an injection mold for molding two-color products. By setting a two-stage lifting and adjusting mechanism, the height of the pressure plate in the mold cavity can be adjusted, which facilitates the adjustment of the thickness of the two-color injection molded products and improves processing efficiency and processing quality.
[0012] This utility model discloses an injection mold for molding two-color products. During the two-color injection molding process, the vertical displacement of the pressure plate is controlled in two stages by a two-stage lifting and adjusting mechanism. This makes the adjustment of the relative height position between the pressure plate and the first and second injection ports simpler and more convenient, reduces the likelihood of incorrect operation, and improves processing efficiency and quality. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation
[0014] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.
[0015] The specific technical solution of this utility model is as follows:
[0016] like Figure 1 As shown, an injection mold for molding two-color products includes a mold 1. The mold 1 has a mold cavity 2 inside, and a pressure regulating plate 3 is movably installed inside the mold cavity 2. The side of the mold 1 has a first injection port 4 and a second injection port 5 communicating with the mold cavity 2. The first injection port 4 and the second injection port 5 are arranged vertically. The second injection port 5 is connected to the lowest point of the mold cavity 2. The top of the mold cavity 2 has an opening, and a cover plate 6 is provided on the opening. The cover plate 6 is provided with a two-stage lifting adjustment mechanism 7. The two-stage lifting adjustment mechanism 7 is connected to the pressure regulating plate 3. The two lifting strokes of the two-stage lifting adjustment mechanism 7 correspond to the height positions of the first injection port 4 and the second injection port 5, respectively.
[0017] The aforementioned two-stage lifting adjustment mechanism 7 includes a bracket 71, a mounting plate 72, a first lifting cylinder 73, and a second lifting cylinder 74. The bracket 71 is mounted on the cover plate 6, and the first lifting cylinder 73 is mounted on the bracket 71. The bottom of the first lifting cylinder 73 is provided with a first piston rod 731, and the mounting plate 72 is fixedly mounted on the first piston rod 731. The second lifting cylinder 74 is fixedly mounted on the mounting plate 72, and the bottom of the second lifting cylinder 74 is provided with a second piston rod 741. The lower end of the second piston rod 741 extends into the mold cavity 2 and is fixedly connected to the pressure regulating plate 3.
[0018] The lifting stroke of the first lifting cylinder 73 corresponds to the distance from the opening of the mold cavity 2 to the first injection port 4.
[0019] The lifting stroke of the second lifting cylinder 74 corresponds to the distance from the first injection port 4 to the bottom surface of the mold cavity 2.
[0020] Specifically, since the pressure regulating plate 3 is inside the mold cavity 2, its height position cannot be directly observed. In the two injection processes, the relative height position between the pressure regulating plate 3 and the first injection port 4 and the second injection port 5 is particularly important. When the pressure regulating plate 3 is in the wrong position, it can easily lead to injection failure.
[0021] Therefore, before injection molding, the first lifting cylinder 73 drives the mounting plate 72 to move down. When the mounting plate 72 abuts against the cover plate 6, the pressure regulating plate 3 is always below the first injection port 4, so that the first color can be injected through the second injection port 5. During the injection of the first color, the second lifting cylinder 74 can drive the pressure regulating plate 3 to continue to move down, so as to adjust the thickness of the first color plastic body to meet the production requirements.
[0022] After the first color injection is completed, the first lifting cylinder 73 moves the mounting plate 72 upward, and the second lifting cylinder 74 moves the pressure regulating plate 3 upward, so that the pressure regulating plate 3 is above the first injection port 4, so that the second color can be injected through the first injection port 4. During the second color injection process, the second lifting cylinder 74 can move the pressure regulating plate 3 downward, so as to adjust the thickness of the second color plastic body to meet production requirements. The two-stage lifting adjustment mechanism 7 avoids errors caused by not being able to observe the height position of the pressure regulating plate 3, making the operation simpler and more convenient, and improving processing efficiency and processing quality.
[0023] The bottom surface of the cover plate 6 is provided with a storage groove 8, which is adapted to the pressure regulating plate 3; specifically, the storage groove 8 facilitates the storage of the pressure regulating plate 3 into the cover plate 6, thus avoiding the pressure regulating plate 3 from forming an obstruction in the mold cavity 2.
[0024] In use, before injection molding, the first lifting cylinder 73 is activated. The first piston rod 731 of the first lifting cylinder 73 drives the mounting plate 72 to move down. When the mounting plate 72 abuts against the cover plate 6, the pressure regulating plate 3 moves to below the first injection port 4. The first lifting cylinder 73 is then closed, so that the pressure regulating plate 3 is always below the first injection port 4. Then, the first color plastic body is injected through the second injection port 5. The second lifting cylinder 74 is activated. The second piston rod 741 of the second lifting cylinder 74 drives the pressure regulating plate 3 to continue to move down, so as to adjust the thickness of the first color plastic body to meet the production requirements.
[0025] After the first color plastic body is injected, the first lifting cylinder 73 and the second lifting cylinder 74 are activated. The first piston rod 731 of the first lifting cylinder 73 moves the mounting plate 72 upward, and the second piston rod 741 of the second lifting cylinder 74 moves the pressure regulating plate 3 upward, so that the pressure regulating plate 3 moves above the first injection port 4. The first lifting cylinder 73 is then closed. Afterward, during the injection of the second color plastic body through the first injection port 4, the second piston rod 741 of the second lifting cylinder 74 moves the pressure regulating plate 3 downward, thereby facilitating the adjustment of the thickness of the second color plastic body. This allows for the injection molding of two-color plastic products using the same mold, which is convenient, improves processing efficiency, and results in a tighter fit between the two colors of plastic body, leading to higher processing quality.
[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An injection mold for molding two-color products, characterized in that: The device includes a mold, which has a mold cavity inside. A pressure regulating plate is movably installed inside the mold cavity. The side of the mold has a first injection port and a second injection port that communicate with the mold cavity. The first injection port and the second injection port are arranged vertically. The second injection port is connected to the lowest point of the mold cavity. The top of the mold cavity has an opening with a cover plate. The cover plate has a two-stage lifting adjustment mechanism connected to the pressure regulating plate. The two lifting strokes of the two-stage lifting adjustment mechanism correspond to the height positions of the first injection port and the second injection port, respectively.
2. The injection mold for molding two-color products according to claim 1, characterized in that, The two-stage lifting adjustment mechanism includes a bracket, a mounting plate, a first lifting cylinder, and a second lifting cylinder. The bracket is mounted on the cover plate, and the first lifting cylinder is mounted on the bracket. The bottom of the first lifting cylinder is provided with a first piston rod, and the mounting plate is fixedly mounted on the first piston rod. The second lifting cylinder is fixedly mounted on the mounting plate, and the bottom of the second lifting cylinder is provided with a second piston rod. The lower end of the second piston rod extends into the mold cavity and is fixedly connected to the pressure regulating plate.
3. The injection mold for molding two-color products according to claim 2, characterized in that, The lifting stroke of the first lifting cylinder corresponds to the distance from the mold cavity opening to the first injection port.
4. The injection mold for molding two-color products according to claim 3, characterized in that, The lifting stroke of the second lifting cylinder corresponds to the distance from the first injection port to the bottom surface of the mold cavity.
5. The injection mold for molding two-color products according to claim 4, characterized in that, The bottom surface of the cover plate is provided with a storage groove, which is adapted to the pressure regulating plate.