A two-color injection head of an injection molding machine

Abstract

The utility model discloses a double -color injection molding head of injection molding machine, including injection molding body and inner core, and the inner core rotation is connected in the injection molding body, is provided with the first runner and second runner for medium flow on the injection molding body, and the center of inner core is provided with inner runner, and the outer runner is formed between inner core and injection molding body, is seted up first intercommunication groove on the inner core, and first intercommunication groove one end communicates with the outer runner, and the other end is used for communicating with the first runner, is seted up second intercommunication groove on the inner core, and second intercommunication groove one end communicates with the inner runner, and the other end is used for communicating with the second runner, and the inner core of rotation setting can adjust the open and close of inner runner and outer runner feed, realizes double -color injection molding, and can use the raw material of higher quality in the actual use outside layer, and the inner layer can adopt relatively lower cost raw material, and the product outside layer raw material of double -color injection molding completely covers the inner layer raw material, not only has the quality guarantee, and can effectively reduce the raw material cost.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and in particular to a two-color injection head for an injection molding machine. Background Technology

[0002] An injection molding machine is a specialized molding equipment that melts plastic by heating it, applies high pressure to the molten plastic, and rapidly injects it into a closed mold cavity. After cooling and solidification, it produces a plastic product that conforms to the shape of the mold cavity.

[0003] Currently, injection molding machines can usually only perform injection molding of one type of material. In actual use, some plastic products have high requirements for surface material. If the same material is used for injection molding, the material cost will increase sharply. Therefore, how to achieve injection molding of different materials for the exterior and interior of the product is a problem that needs to be overcome. This way, relatively cheaper materials can be used for the interior to reduce costs. Utility Model Content

[0004] To further reduce production costs and enable the injection molding of two materials, this application provides a two-color injection head for an injection molding machine.

[0005] This application provides a two-color injection head for an injection molding machine, employing the following technical solution: A two-color injection head for an injection molding machine includes an injection body and an inner core. The inner core is rotatably connected to the injection body. The injection body is provided with a first flow channel and a second flow channel for media flow. An inner flow channel is provided at the center of the inner core. An outer flow channel is formed between the inner core and the injection body. A first connecting groove is provided on the inner core. One end of the first connecting groove is connected to the outer flow channel, and the other end is used to connect to the first flow channel. A second connecting groove is provided on the inner core. One end of the second connecting groove is connected to the inner flow channel, and the other end is used to connect to the second flow channel.

[0006] Optionally, the first flow channel and the second flow channel are symmetrically arranged, and the opening of the first connecting groove is larger than the opening of the second connecting groove.

[0007] Optionally, the inner core includes two rotation states. In the first rotation state, the first connecting groove is connected to the first flow channel, and the second connecting groove is not connected to the second flow channel. In the second rotation state, the first connecting groove is connected to the first flow channel, and the second connecting groove is connected to the second flow channel.

[0008] Optionally, the inner core further includes a third rotation state, in which the first connecting groove is not connected to the first flow channel, and the second connecting groove is not connected to the second flow channel.

[0009] Optionally, the diameter of the first connecting groove gradually decreases from top to bottom.

[0010] Optionally, the injection molding body includes a main body and a head. The head is threadedly connected to the end of the main body. The head has an injection head at its center. The injection head has an injection hole at its center. The injection hole communicates with the outer flow channel and the inner flow channel.

[0011] Optionally, the injection head is axially slidably connected to the head, and the diameter of the injection hole gradually decreases from the outside to the inside.

[0012] Optionally, the injection head has a protruding anti-detachment part at one end inside the head, and a retaining ring is threadedly connected to the end of the injection head that protrudes outside the head.

[0013] Optionally, a plug rod is axially slidably connected within the inner flow channel of the inner core, and the opening of the second connecting groove is located on the moving path of the plug rod. The plug rod is used to block the opening of the second connecting groove, and a first driving source is connected to the plug rod to drive its axial movement.

[0014] Optionally, the inner core has an outlet end adapted to the injection hole, the inner core is axially slidably connected to the injection molding body, and a second driving source is connected to the inner core to drive its axial movement.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. The inner core can be rotated to adjust the opening and closing of the inner and outer flow channels. In actual use, the outer and inner materials can flow into the first and second flow channels respectively and finally be discharged from the injection hole, realizing two-color injection molding. In actual use, the outer layer can use high-quality raw materials, while the inner layer can use relatively low-cost raw materials. In this way, the outer material of the two-color injection molded product completely covers the inner material. Finally, the plastic products obtained by two-color injection molding not only have guaranteed quality, but also effectively reduce raw material costs. 2. The opening of the first connecting groove is larger than the opening of the second connecting groove. This way, when the inner core is rotated to switch, it can be switched to the first connecting groove and the first flow channel first. At this time, the outer layer material enters the outer flow channel first. Then, the inner core is rotated to switch to the state of simultaneous feeding of the inner and outer flow channels. This ensures that the outer layer material can enter first in the early stage, so that the inner layer material can be fully covered on the outside, avoiding the phenomenon that the material in the inner flow channel is located on the outside of the injection molded product. 3. The conical design of the injection hole and the axial sliding connection of the injection head ensure that during the separation of the injection head from the mold after injection, the material break point will be located at the end of the smallest diameter of the injection hole, achieving accurate material break position. This ensures that the material break position is located inside the injection head, where the temperature is higher, so that the injected raw material can be well ensured to be in a good molten state and have good fluidity when the next product is injected. 4. The axial movement of the plug rod and inner core can block the outer and inner flow channels. Combined with the rotation of the inner core, it can play a dual role in closing off the blockage. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of an embodiment of this application.

[0017] Figure 2 This is a cross-sectional view of an embodiment of this application, used to show that both the first flow channel and the second flow channel are in a closed state.

[0018] Figure 3 This is a cross-sectional view of an embodiment of this application, used to show that the first flow channel and the outer flow channel are in a connected state, and the second flow channel is in a closed state.

[0019] Figure 4 This is a cross-sectional view of an embodiment of this application, used to show that both the first flow channel and the second flow channel are in the open state.

[0020] Figure 5 This is a structural diagram of the inner core in an embodiment of this application, used to show the first connecting groove.

[0021] Figure 6 This is a side view of the inner core in an embodiment of this application.

[0022] Figure 7 This is a perspective view of the inner core in an embodiment of this application.

[0023] Figure 8 This is a structural diagram of the head and injection head in the embodiments of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Injection body; 2. Inner core; 3. First flow channel; 4. Second flow channel; 5. Main body; 6. Head; 7. Injection head; 8. Injection hole; 9. Outer flow channel; 10. Inner flow channel; 11. First connecting groove; 12. Second connecting groove; 13. Anti-detachment part; 14. Retaining ring; 15. Plug rod; 16. First drive source; 17. Discharge end; 18. Second drive source; 19. Base; 20. Drive component. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0026] A two-color injection head for an injection molding machine, such as Figure 1 and Figure 2As shown, the injection molding body 1 and the inner core 2 are rotatably connected inside the injection molding body 1. A first flow channel 3 and a second flow channel 4 for the flow of raw material medium are symmetrically arranged inside the injection molding body 1. The injection molding body 1 includes a main body 5 and a front end head 6. The head 6 is threadedly connected to the main body 5 to achieve detachment. An injection head 7 is installed on the head 6. An injection hole 8 is opened in the center of the injection head 7. The raw material medium is finally discharged through the injection hole 8 and enters the mold cavity to achieve injection molding.

[0027] like Figures 2-4 As shown, there is a gap between the head 6 and the end of the inner core 2, forming an outer flow channel 9. One end of the outer flow channel 9 is used to communicate with the injection hole 8, and the other end of the outer flow channel 9 is used to communicate with the first flow channel 3. An inner flow channel 10 is provided in the center of the inner core 2. One end of the inner flow channel 10 passes through the end of the inner core 2. The inner flow channel 10 is located in the center of the outer flow channel 9 and is surrounded by the outer flow channel 9. One end of the inner flow channel 10 is used to communicate with the injection hole 8, and the other end is used to communicate with the second flow channel 4. A first connecting groove 11 and a second connecting groove 12 are provided on the inner core 2. One end of the first connecting groove 11 is used to communicate with the outer flow channel 9, and the other end is used to communicate with the first flow channel 3. One end of the second connecting groove 12 is used to communicate with the inner flow channel 10, and the other end is used to communicate with the second flow channel 4. In actual use, the position of the first connecting groove 11 and the second connecting groove 12 can be switched by rotating the inner core 2, so that the raw material medium in the first flow channel 3 can enter the outer flow channel 9 and the raw material medium in the second flow channel 4 can enter the inner flow channel 10.

[0028] like Figures 5-7 As shown, the first connecting groove 11 and the second connecting groove 12 are arranged opposite each other on the surface of the inner core 2, and the opening of the second connecting groove 12 is larger than the opening of the first connecting groove 11. In this way, when rotating the inner core 2 to switch, it can first switch to the first connecting groove 11 and the first flow channel 3 to flow. At this time, the outer layer material enters the outer flow channel 9 first. Then, the inner core 2 is rotated to switch to the first connecting groove 11 and the first flow channel 3 to flow and the second connecting groove 12 and the second flow channel 4 to flow. At this time, the inner flow channel 10 and the outer flow channel 9 are in a state of simultaneous feeding. This ensures that the outer layer material can enter first, so that the inner layer material can be fully covered from the outside, avoiding the phenomenon that the material in the inner flow channel 10 is located outside the injection molded product. In addition, the diameter of the first connecting groove 11 gradually decreases from top to bottom. In this way, the material enters from the opening of the first connecting groove 11 and gradually gathers and finally enters the outer flow channel 9, which plays a role in gathering and guiding the incoming material.

[0029] like Figures 2-4As shown, the inner core 2 has multiple rotational states. In this embodiment, the inner core 2 has three rotational states. In the first rotational state, the first connecting groove 11 is connected to the first flow channel 3, and the second connecting groove 12 is not connected to the second flow channel 4. In this state, the outer layer material in the first flow channel 3 passes through the first connecting groove 11 and enters the outer flow channel 9. At this time, only the outer layer material is injected. For specific states, see [link to documentation]. Figure 3 In the second rotating state, the first connecting groove 11 is connected to the first flow channel 3, and the second connecting groove 12 is connected to the second flow channel 4. At this time, the raw material in the first flow channel 3 enters the outer flow channel 9, and the raw material in the second flow channel 4 enters the inner flow channel 10. The inner flow channel 10 is covered by the outer flow channel 9 and both exit from the injection hole 8. See the specific state for details. Figure 4 In the third rotating state, the first connecting groove 11 is not connected to the first flow channel 3, and the second connecting groove 12 is not connected to the second flow channel 4. At this time, neither the outer flow channel 9 nor the inner flow channel 10 is receiving material. See the specific state for details. Figure 2 In this way, the rotation state can be switched by rotating the inner core 2, thereby changing the feeding method of the dual-color injection head 7, and finally achieving the injection of two different materials.

[0030] like Figure 2 and Figure 8 As shown, the injection head 7 is axially slidably connected to the head 6, and the injection hole 8 is tapered. The diameter of the injection hole 8 gradually decreases from the outside to the inside. In this way, after injection molding, during the separation of the injection head 7 from the mold, the material break will be located at the end of the smallest diameter of the injection hole 8, achieving accurate material break position. This material break position is located inside the injection head 7, where the temperature is higher. When the next product is injected, it can be well ensured that the injected raw material is in a good molten state and has good fluidity. At the same time, it can also ensure that when the next product is first injected, the raw material in the injection head 7 is the raw material in the outer flow channel 9, thereby ensuring that the raw material in the inner flow channel 10 is well covered by the outer flow channel 9.

[0031] like Figure 2 and Figure 8 As shown, the injection head 7 has an outwardly protruding anti-detachment part 13 at one end inside the head 6, and a retaining ring 14 is threadedly connected to the end of the injection head 7 that protrudes from the head 6. The retaining ring 14 and the anti-detachment part 13 effectively prevent the injection head 7 from coming out, so that the injection head 7 can move axially within a limited stroke. In this embodiment, the stroke of the injection head is about 2 mm. The retaining ring 14 and the injection head 7 are connected by a thread, which facilitates the installation and removal of the injection head 7.

[0032] like Figure 3 , Figure 4 and Figure 8As shown, a blocking rod 15 is axially slidably connected in the inner flow channel 10 of the inner core 2, and the slot of the second connecting groove 12 is located on the moving path of the blocking rod 15. A first driving source 16 is connected to the blocking rod 15 to drive it to move axially. The first driving source 16 is a first hydraulic cylinder. In this way, the blocking rod 15 can be driven to move axially by the first driving source 16 to block the second connecting groove 12, thus achieving double blocking.

[0033] like Figure 2 , Figure 3 and Figure 8 As shown, the inner core 2 has a discharge end 17 that is adapted to the injection hole 8 at its end. The outlet of the inner flow channel 10 is set on the discharge end 17. At the same time, a second drive source 18 is connected to the inner core 2 to drive it to move axially. The second drive source 18 is a second hydraulic cylinder. In this way, the inner core 2 is driven to move axially by the second drive source 18 so that the discharge end 17 is inserted into the injection hole 8. At this time, the outer flow channel 9 is no longer connected to the injection hole 8, so that the raw material in the outer flow channel 9 will no longer flow out.

[0034] like Figure 1 As shown, a drive component 20 is provided on the inner core 2 to drive it to rotate and adjust its state position. In actual use, the two-color injection head 7 is installed on the feeding base 19. The drive component 20 includes a third hydraulic cylinder. One end of the cylinder body of the third hydraulic cylinder is ball-jointed on the base 19, and the end of the piston rod of the third hydraulic cylinder is ball-jointed to the inner core 2. The inner core 2 can be driven to rotate by the extension and retraction of the piston rod to achieve state adjustment. The ball-joint connection means that the inner core 2 can not only be adjusted in circumferential rotation, but also has a certain degree of axial adjustability.

[0035] Working principle: Initially, the first flow channel 3 is not connected to the outer flow channel 9, and the second flow channel 4 is not connected to the inner flow channel 10. When injection molding begins, the inner core 2 is driven to rotate to the first rotation state. At this time, the outer layer material in the first flow channel 3 flows through the first connecting groove 11 to the outer flow channel 9 and finally flows into the injection hole 8. The inner layer material in the second flow channel 4 is not connected to the inner flow channel 10. Then, the inner core 2 is driven to rotate to the second rotation state. At this time, the outer layer material in the first flow channel 3 flows to the outer flow channel 9, and the inner layer material in the second flow channel 4 flows to the inner flow channel 10. The material flows through the second connecting channel 12 into the inner flow channel 10, meaning that the inner flow channel 10 and the outer flow channel 9 are simultaneously fed into the injection hole 8, ultimately achieving two-color injection molding where the outer material covers the inner material. After injection molding is completed, the feeding of the inner material in the second flow channel 4 is first closed, allowing the outer material to continue feeding to finish. Finally, the feeding of the first flow channel 3 is closed to complete the entire injection molding process. In the end, the inner material of the injection molded product is completely covered by the outer material. In this way, the inner material can be made of a lower-cost material, thereby ultimately reducing material costs and production costs.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-color injection head for an injection molding machine, characterized in that: The device includes an injection molding body (1) and an inner core (2). The inner core (2) is rotatably connected inside the injection molding body (1). The injection molding body (1) is provided with a first flow channel (3) and a second flow channel (4) for the flow of medium. The center of the inner core (2) is provided with an inner flow channel (10). An outer flow channel (9) is formed between the inner core (2) and the injection molding body (1). A first connecting groove (11) is provided on the inner core (2). One end of the first connecting groove (11) is connected to the outer flow channel (9), and the other end is used to connect to the first flow channel (3). A second connecting groove (12) is provided on the inner core (2). One end of the second connecting groove (12) is connected to the inner flow channel (10), and the other end is used to connect to the second flow channel (4).

2. The two-color injection head of an injection molding machine according to claim 1, characterized in that: The first flow channel (3) and the second flow channel (4) are symmetrically arranged, and the opening of the first connecting groove (11) is larger than the opening of the second connecting groove (12).

3. A two-color injection head for an injection molding machine according to claim 1 or 2, characterized in that: The inner core (2) includes two rotation states. In the first rotation state, the first connecting groove (11) is connected to the first flow channel (3), and the second connecting groove (12) is not connected to the second flow channel (4). In the second rotation state, the first connecting groove (11) is connected to the first flow channel (3), and the second connecting groove (12) is connected to the second flow channel (4).

4. The two-color injection head of an injection molding machine according to claim 3, characterized in that: The inner core (2) also includes a third rotation state, in which the first connecting groove (11) is not connected to the first flow channel (3) and the second connecting groove (12) is not connected to the second flow channel (4).

5. The two-color injection head of an injection molding machine according to claim 1, characterized in that: The diameter of the first connecting groove (11) gradually decreases from top to bottom.

6. The two-color injection head of an injection molding machine according to claim 1, characterized in that: The injection molding body (1) includes a main body (5) and a head (6). The head (6) is threaded to the end of the main body (5). The head (6) has an injection head (7) at its center. The injection head (7) has an injection hole (8) at its center. The injection hole (8) is connected to the outer flow channel (9) and the inner flow channel (10).

7. A two-color injection head for an injection molding machine according to claim 6, characterized in that: The injection head (7) is axially slidably connected to the head (6), and the diameter of the injection hole (8) gradually decreases from the outside to the inside.

8. A two-color injection head for an injection molding machine according to claim 7, characterized in that: The injection head (7) has a protruding anti-detachment part (13) at one end inside the head (6), and a retaining ring (14) is threaded to the end of the injection head (7) that protrudes outside the head (6).

9. A two-color injection head for an injection molding machine according to claim 1, characterized in that: A plug rod (15) is axially slidably connected in the inner flow channel (10) of the inner core (2). The opening of the second connecting groove (12) is located on the moving path of the plug rod (15). The plug rod (15) is used to block the opening of the second connecting groove (12). A first driving source (16) that drives the plug rod (15) to move axially is connected to the plug rod (15).

10. A two-color injection head for an injection molding machine according to claim 6 or 7, characterized in that: The inner core (2) has an outlet end (17) adapted to the injection hole (8) at its end. The inner core (2) is axially slidably connected in the injection body (1). A second drive source (18) is connected to the inner core (2) to drive its axial movement.

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