Double-color co-injection molding machine

Abstract

The utility model relates to the technical field of hydraulic forming machines, and discloses a double-color co-injection forming machine which comprises a machine body, a lower die holder, a die groove, a die core and a cold water system. The lower die holder is mounted in the middle of the machine body and used for supporting the die; the die groove is formed in the table top of the lower die base; the mold core is assembled in the mold cavity and is used for forming a double-color product; the cold water system comprises an upper runner and a lower runner which are both laid in the mold core, the upper runner extends from the water inlet end of the mold core along the interior of the mold core, the extending direction of the upper runner is parallel to the extending direction of the inner wall of a cavity of the mold core, the lower runner is vertically away from the cavity of the mold core, and the lower runner is connected between the tail end of the upper runner and the water outlet end of the mold core; and the vertical height difference exists between the upper runner and the lower runner, so that a closed-loop cooling path is formed.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic molding machine technology, specifically a two-color co-injection molding machine. Background Technology

[0002] In the field of two-color co-injection molding technology, the cooling effect of the mold during injection molding plays a decisive role in product quality and production efficiency. With the increasing market demand for two-color plastic products, higher requirements are being placed on product precision, surface quality, and production efficiency, thus demanding more effective cooling.

[0003] The existing two-color co-injection molding machines still have the following problems in their cooling systems: Traditional mold cooling systems usually use simple straight cooling channels, which are often limited to the surface of the mold, resulting in a limited heat exchange area between the coolant and the inner wall of the mold cavity, and low cooling efficiency.

[0004] Therefore, there is an urgent need for a two-color co-injection molding machine to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a two-color co-injection molding machine to solve the problem of low cooling efficiency of the cooling system in the two-color co-injection molding machine.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a two-color co-injection molding machine, comprising:

[0007] body;

[0008] The lower mold base is installed in the middle of the machine body and is used to support the mold;

[0009] A mold groove is formed on the platform of the lower mold base;

[0010] A mold core, assembled in the mold groove, is used to form two-color products;

[0011] The cooling water system includes an upper flow channel and a lower flow channel both laid inside the mold core. The upper flow channel extends from the water inlet end of the mold core along the interior of the mold core, and the extension direction of the upper flow channel is parallel to the extension direction of the inner wall of the mold core cavity. The lower flow channel is vertically away from the mold core cavity and is connected between the end of the upper flow channel and the water outlet end of the mold core. The upper flow channel and the lower flow channel have a vertical height difference, forming a closed-loop cooling path.

[0012] As a preferred embodiment of a two-color co-injection molding machine, the upper runner includes an inlet runner, a branch runner, and an outlet runner connected in sequence. The inlet runner extends from the water inlet end of the mold core along the interior of the mold core. The branch runner is disposed inside the mold core and extends parallel to the inner wall of the mold core cavity from the extension end of the inlet runner. The outlet runner is connected to the lower runner from the extension end of the branch runner. The vertical centerline of the inlet runner and the vertical centerline of the outlet runner have a distance difference.

[0013] As a preferred embodiment of a two-color co-injection molding machine, the branch channel body includes at least one transverse branch, one longitudinal branch, and one connecting branch. The adjacent and parallel transverse branches are vertically arranged on the inlet channel body and the outlet channel body. The adjacent and parallel longitudinal branches are vertically connected to the adjacent transverse branches. The connecting branch is connected to the adjacent longitudinal branch.

[0014] As a preferred embodiment of a two-color co-injection molding machine, the direction of the lower runner is inclined from the extension point of the upper runner towards the water outlet end of the mold core, and the height of the extension point of the upper runner is higher than the height of the water outlet end of the mold core.

[0015] As a preferred embodiment of a two-color co-injection molding machine, it also includes a rotary station located at the bottom of the lower mold base, the rotary station being used to rotate the lower mold base to achieve the two-color injection molding operation.

[0016] As a preferred embodiment of a two-color co-injection molding machine, the rotating station includes a base, a rotating plate, and a locking position. The base is positioned on the bottom surface of the lower mold base, the rotating plate is disposed on the bottom surface of the base, the locking position is opened on the top surface of the rotating plate, and the base is embedded in the locking position.

[0017] As a preferred embodiment of a two-color co-injection molding machine, it also includes a mold closing auxiliary station, which is disposed on the lower mold base, and the mold closing auxiliary station is used to close the lower mold base.

[0018] As a preferred embodiment of a two-color co-injection molding machine, the mold closing auxiliary station includes an upper mold base, an upper air extraction channel, a lower air extraction channel, and a vacuum actuator. The upper mold base is located on top of the lower mold base, the upper air extraction channel is laid on the bottom surface of the upper mold base, and the lower air extraction channel is laid on the top surface of the lower mold base. When the upper mold base descends, the upper air extraction channel can cooperate with the lower air extraction channel of the lower mold base. The vacuum actuator is located on the side of the lower mold base, and the channel opening of the lower air extraction channel is connected to the air extraction end of the vacuum actuator.

[0019] As a preferred embodiment of a two-color co-injection molding machine, it also includes a support station located on the top of the machine body, the support station being used to support the injection gun.

[0020] As a preferred embodiment of a two-color co-injection molding machine, the support station includes a connecting frame and an auxiliary housing. The connecting frame is positioned on the top surface of the machine body, and the auxiliary housing is positioned on the connecting frame. The inner wall of the auxiliary housing has a mating opening, and the inner wall shape of the mating opening matches the gun surface of the injection gun.

[0021] The beneficial effects of this invention are as follows: By setting up a cooling water system, including an upper runner and a lower runner evenly laid within the mold core, the upper runner extends parallel to the inner wall of the mold core cavity. During the flow of the coolant in the upper runner, it can achieve large-area contact with the inner wall of the cavity, allowing the coolant to fully absorb the heat released by the molten plastic during injection molding, increasing the heat exchange area and thus improving cooling efficiency. The lower runner is vertically away from the mold core cavity, preventing high-temperature water from transferring heat back to the mold core and product, thus preventing localized overheating that could lead to deformation, shrinkage, and surface quality problems. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure in the first direction of a two-color co-injection molding machine provided by this utility model;

[0023] Figure 2 A schematic diagram of the overall structure in the second direction of a two-color co-injection molding machine provided by this utility model;

[0024] Figure 3 A schematic diagram of the overall structure of the cooling water system in a two-color co-injection molding machine provided by this utility model;

[0025] Figure 4 A schematic diagram of the overall structure of the cooling water system for the mold core assembly in a two-color co-injection molding machine provided by this utility model;

[0026] Figure 5 for Figure 4 Side view.

[0027] The reference numerals in the figures are as follows: 1. Machine body; 2. Lower mold base; 3. Mold groove; 4. Mold core; 5. Cooling water system; 51. Upper runner; 61. Inlet runner body; 62. Branch runner body; 71. Horizontal support; 72. Vertical support; 73. Connecting support; 63. Outlet runner body; 52. Lower runner; 8. Rotating station; 81. Base; 82. Rotating plate; 83. Locking position; 9. Mold closing auxiliary station; 91. Upper mold base; 92. Upper air extraction channel; 93. Lower air extraction channel; 94. Vacuum actuator; 10. Mold injection station; 101. Top seat; 102. Injection port; 103. Support station; 104. Connecting frame; 105. Auxiliary shell. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 utility model.

[0032] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0033] In one embodiment of this utility model, such as Figure 1-5 As shown, a two-color co-injection molding machine is provided, including: a machine body 1, a lower mold base 2, a mold groove 3, a mold core 4, and a cooling water system 5. The lower mold base 2 is installed in the middle of the machine body 1 and is used to support the mold; the mold groove 3 is formed on the platform of the lower mold base 2; the mold core 4 is assembled in the mold groove 3 and is used to mold two-color products; the cooling water system 5 includes an upper runner 51 and a lower runner 52 evenly laid in the mold core 4. The upper runner 51 extends from the water inlet end of the mold core 4 along the interior of the mold core 4, and the extension direction of the upper runner 51 is parallel to the extension direction of the inner wall of the cavity of the mold core 4. The lower runner 52 is vertically away from the cavity of the mold core 4, and the lower runner 52 is connected between the end of the upper runner 51 and the water outlet end of the mold core 4. The upper runner 51 and the lower runner 52 have a vertical height difference, forming a closed-loop cooling path.

[0034] The two-color co-injection molding machine provided by this utility model features a cooling water system 5, including an upper runner 51 and a lower runner 52 evenly distributed within the mold core 4. The upper runner 51 extends parallel to the inner wall of the mold core 4 cavity, allowing the coolant to make large-area contact with the cavity wall during its flow. This enables the coolant to fully absorb the heat released by the molten plastic during injection molding, increasing the heat exchange area and thus improving cooling efficiency. The lower runner 52 is vertically away from the mold core 4 cavity, preventing high-temperature water from transferring heat back to the mold core 4 and the product, thus preventing localized overheating that could lead to deformation, shrinkage, and surface quality issues.

[0035] Preferably, the upper flow channel 51 and the lower flow channel 52 have a vertical height difference, forming a closed-loop cooling path, which makes the coolant form a continuous flow circulation inside the mold core 4, improving the flow efficiency and heat exchange efficiency of the coolant.

[0036] Preferably, the upper flow channel 51 includes an inlet channel 61, a branch channel 62, and an outlet channel 63 connected in sequence, further optimizing the flow path and cooling effect of the coolant. The inlet channel 61 extends from the water inlet end of the mold core 4 along the interior of the mold core 4. The branch channel 62 is disposed inside the mold core 4, and extends parallel to the inner wall of the cavity of the mold core 4 from the extension end of the inlet channel 61. The outlet channel 63 connects to the lower flow channel 52 from the extension end of the branch channel 62. There is a distance difference between the vertical centerline of the inlet channel 61 and the vertical centerline of the outlet channel 63.

[0037] Preferably, the direction of the lower flow channel 52 is inclined from the extension point of the upper flow channel 51 towards the outlet end of the mold core 4, and the height of the extension point of the upper flow channel 51 is higher than the height of the outlet end of the mold core 4. By setting the inclined lower flow channel 52, the cooling liquid can gain additional power during flow by means of gravity. When the coolant flows from the upper flow channel 51 into the lower flow channel 52, since the extension point of the upper flow channel 51 is higher than the outlet end of the mold core 4, the coolant can flow more smoothly downwards by utilizing the gravitational potential energy generated by the height difference. This reduces the dependence on external pumping equipment, thereby reducing energy consumption. At the same time, the inclined lower flow channel 52 can effectively prevent the coolant from stagnating in the mold core 4, ensuring that the coolant always remains in a flowing state and is discharged from the mold core 4 in a timely manner, ensuring the consistency and stability of the cooling effect.

[0038] The inlet channel 61 introduces coolant into the mold core 4, while the branch channel 62 extends parallel to the inner wall of the cavity, enabling the coolant to precisely cool the area around the cavity and ensuring efficient heat exchange. The outlet channel 63 smoothly leads the coolant, after absorbing heat, out to the lower channel 52.

[0039] Furthermore, the design of a distance difference between the vertical center lines of the inlet channel 61 and the outlet channel 63 increases the flow path and residence time of the coolant in the mold core 4, allowing the coolant to exchange heat more fully with the mold core 4, thereby further improving the cooling efficiency.

[0040] Specifically, the branch channel body 62 includes at least one transverse branch 71, a longitudinal branch 72, and a connecting branch 73. Adjacent and parallel transverse branches 71 are vertically arranged in the inlet channel body 61 and the outlet channel body 63. Adjacent and parallel longitudinal branches 72 are vertically connected to adjacent transverse branches 71. The connecting branch 73 is connected to adjacent longitudinal branches 72.

[0041] The transverse supports 71 are vertically positioned between the inlet channel 61 and the outlet channel 63. After the coolant flows from the inlet channel 61 into the transverse supports 71, it can quickly and evenly disperse, increasing the contact area and contact points between the coolant and the mold core 4. Simultaneously, adjacent and parallel longitudinal supports 72 are vertically connected to adjacent transverse supports 71, further expanding the coolant flow path and allowing the coolant to cover more areas of the mold core 4 cavity. Connecting supports 73 link adjacent longitudinal supports 72, enabling the coolant to form a continuous and smooth circulation throughout the network of branch channels 62. This multi-dimensional, networked flow channel layout significantly increases the heat exchange area and time between the coolant and the inner wall of the mold core 4 cavity, ensuring that the coolant can fully absorb the heat released by the molten plastic during injection molding, achieving efficient cooling.

[0042] This two-color co-injection molding machine also includes a rotary station 8, which is located at the bottom of the lower mold base 2. The rotary station 8 is used to rotate the lower mold base 2 to realize the two-color injection molding operation.

[0043] Specifically, the rotary station 8 includes a base 81, a rotating plate 82, and a retaining position 83. The base 81 is positioned on the bottom surface of the lower mold base 2, the rotating plate 82 is located on the bottom surface of the base 81, and the retaining position 83 is located on the top surface of the rotating plate 82. The base 81 is embedded in the retaining position 83. The rotary station 8 is located at the bottom of the lower mold base 2, allowing for convenient rotation of the lower mold base 2. In the two-color injection molding process, after one injection is completed, the operator only needs to rotate the lower mold base 2 by a certain angle using the rotary station 8 to quickly switch to the secondary injection position, eliminating the need for cumbersome mold disassembly and reinstallation steps, thus optimizing the injection molding process.

[0044] Furthermore, the locking position 83 fits tightly with the base 81, limiting the wobbling and displacement of the lower mold base 2 during rotation. During injection molding machine operation, the powerful injection pressure causes vibration and impact forces on the mold, and the presence of the locking position 83 effectively disperses these external forces, enhancing rotational stability.

[0045] This dual-color co-injection molding machine also includes a mold closing auxiliary station 9, which is set on the lower mold base 2. The mold closing auxiliary station 9 is used to close the lower mold base 2 tightly.

[0046] Specifically, the mold closing auxiliary station 9 includes an upper mold base 91, an upper air extraction channel 92, a lower air extraction channel 93, and a vacuum driver 94. The upper mold base 91 is located on the top of the lower mold base 2. The upper air extraction channel 92 is laid on the bottom surface of the upper mold base 91, and the lower air extraction channel 93 is laid on the top surface of the lower mold base 2. When the upper mold base 91 descends, the upper air extraction channel 92 can cooperate with the lower air extraction channel 93 of the lower mold base 2. The vacuum driver 94 is located on the side of the lower mold base 2, and the channel opening of the lower air extraction channel 93 is connected to the air extraction end of the vacuum driver 94.

[0047] In this embodiment, when the mold closing action begins, the upper mold base 91 descends, and the upper suction channel 92 and the lower suction channel 93 cooperate with each other. At this time, the vacuum driver 94 is activated, and air is extracted between the upper and lower mold bases 2 through the lower suction channel 93 to form a local vacuum environment. Under atmospheric pressure, the upper and lower mold bases 2 fit tightly together, effectively avoiding problems such as plastic melt leakage, product flash, and dimensional deviations caused by loose mold closing. Moreover, it ensures that the vacuum suction is evenly distributed on the contact surface of the mold base, so that the mold closing pressure is evenly applied to the entire mold, effectively preventing deformation caused by uneven local stress on the mold, ensuring the precise shape of the mold cavity, which is conducive to the uniform filling of the plastic melt in the cavity, and further improving the molding quality and internal structural stability of the product.

[0048] The two-color co-injection molding machine also includes a mold injection station 10, which is located on the top of the machine body 1. The mold injection station 10 is used to inject liquid substrate.

[0049] Specifically, the mold injection station 10 includes a top seat 101 and at least two injection ports 102. The top seat 101 is located on the top of the upper mold base 91. The mold injection station 10 can be raised or lowered along the lower mold base 2 under the action of a lifting component such as a cylinder. The injection ports 102 are located on the top of the top seat 101.

[0050] In this embodiment, by setting multiple injection ports 102, the injection volume and injection position of the liquid substrate can be precisely controlled for different injection molding needs. During two-color injection molding, liquid substrates of different colors or materials can be precisely injected into specific areas of the mold cavity according to the product design requirements, ensuring that the color distribution and material combination of the product meet the design expectations.

[0051] The two-color co-injection molding machine also includes a support station 103, which is located on the top of the machine body 1. The support station 103 is used to support the injection gun.

[0052] Specifically, the support station 103 includes a connecting frame 104 and an auxiliary housing 105. The connecting frame 104 is positioned on the top surface of the machine body 1, and the auxiliary housing 105 is positioned on the connecting frame 104. The inner wall of the auxiliary housing 105 is provided with a mating opening, and the shape of the inner wall of the mating opening matches the gun surface of the injection gun.

[0053] In this embodiment, a connecting frame 104 is securely positioned on the top surface of the machine body 1, and an auxiliary housing 105 is mounted on the connecting frame 104. The shape of the mating opening on its inner wall matches the surface of the injection gun. This ensures that the injection gun is stably supported during operation, effectively preventing instability such as shaking or displacement of the injection gun. This ensures that the liquid substrate can be accurately injected into the mold cavity, thereby improving injection precision and product quality.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A two-color co-injection molding machine, characterized in that, include: body; The lower mold base is installed in the middle of the machine body and is used to support the mold; A mold groove is formed on the platform of the lower mold base; A mold core, assembled in the mold groove, is used to form two-color products; The cooling water system includes an upper flow channel and a lower flow channel both laid inside the mold core. The upper flow channel extends from the water inlet end of the mold core along the interior of the mold core, and the extension direction of the upper flow channel is parallel to the extension direction of the inner wall of the mold core cavity. The lower flow channel is vertically away from the mold core cavity and is connected between the end of the upper flow channel and the water outlet end of the mold core. The upper flow channel and the lower flow channel have a vertical height difference, forming a closed-loop cooling path.

2. The two-color co-injection molding machine according to claim 1, characterized in that, The upper flow channel includes an inlet channel, a branch channel, and an outlet channel connected in sequence. The inlet channel extends from the water inlet end of the mold core along the interior of the mold core. The branch channel is disposed inside the mold core and extends parallel to the inner wall of the mold core cavity from the extension end of the inlet channel. The outlet channel is connected to the lower flow channel from the extension end of the branch channel. The vertical center line of the inlet channel and the vertical center line of the outlet channel have a distance difference.

3. A two-color co-injection molding machine according to claim 2, characterized in that, The branch channel includes at least one transverse branch, one longitudinal branch, and one connecting branch. The adjacent and parallel transverse branches are perpendicularly arranged in the inlet channel and the outlet channel. The adjacent and parallel longitudinal branches are perpendicularly connected to the adjacent transverse branches. The connecting branch is connected to the adjacent longitudinal branch.

4. A two-color co-injection molding machine according to any one of claims 1-3, characterized in that, The direction of the lower flow channel is inclined from the extension point of the upper flow channel toward the water outlet end of the mold core, and the height of the extension point of the upper flow channel is higher than the height of the water outlet end of the mold core.

5. A two-color co-injection molding machine according to any one of claims 1-3, characterized in that, It also includes a rotary station, which is located at the bottom of the lower mold base. The rotary station is used to rotate the lower mold base to achieve two-color injection molding operation.

6. A two-color co-injection molding machine according to claim 5, characterized in that, The rotating station includes a base, a rotating plate, and a locking position. The base is positioned on the bottom surface of the lower mold base, the rotating plate is disposed on the bottom surface of the base, the locking position is opened on the top surface of the rotating plate, and the base is embedded in the locking position.

7. A two-color co-injection molding machine according to any one of claims 1-3 or 6, characterized in that, It also includes a mold closing auxiliary station, which is set on the lower mold base, and the mold closing auxiliary station is used to close the lower mold base.

8. A two-color co-injection molding machine according to claim 7, characterized in that, The mold closing auxiliary station includes an upper mold base, an upper air extraction channel, a lower air extraction channel, and a vacuum actuator. The upper mold base is located on top of the lower mold base. The upper air extraction channel is laid on the bottom surface of the upper mold base, and the lower air extraction channel is laid on the top surface of the lower mold base. When the upper mold base descends, the upper air extraction channel can cooperate with the lower air extraction channel of the lower mold base. The vacuum actuator is located on the side of the lower mold base, and the channel opening of the lower air extraction channel is connected to the air extraction end of the vacuum actuator.

9. A two-color co-injection molding machine according to any one of claims 1-3, 6, or 8, characterized in that, It also includes a support station, which is located on the top of the machine body and is used to support the injection gun.

10. A two-color co-injection molding machine according to claim 9, characterized in that, The support station includes a connecting frame and an auxiliary housing. The connecting frame is positioned on the top surface of the machine body, and the auxiliary housing is positioned on the connecting frame. The inner wall of the auxiliary housing has a mating opening, and the inner wall shape of the mating opening matches the gun surface of the injection gun.

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