A two-color injection mold head

Abstract

This utility model discloses a two-color injection mold head, including a mold head body. One end of the mold head body is provided with an injection port. A first material channel is provided inside the mold head body. The mold head body is hollow and rotatably connected to a mandrel. An outer material channel is formed between the end of the mandrel and the mold head body. The outer material channel is connected to the injection port. A first connecting groove for connecting the outer material channel and the first material channel is opened on the mandrel. The mandrel is axially slidably connected in the mold head body. The end of the mandrel has a plug-in end adapted to the injection port. The rotation of the mandrel can not only realize the opening and closing of the first material channel, but also, after the product injection is completed, by driving the mandrel axially, the outer material channel can be closed by the cooperation of the plug-in end and the injection port. This effectively prevents material leakage when switching injection molds, realizes the multi-purpose of the mandrel, and has a simple and compact overall structure.

Description

Technical Field

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

[0002] Injection molding machines are among the most commonly used equipment in the plastics processing industry. They heat and melt thermoplastic or thermosetting plastics, then inject them into a mold cavity under high pressure. After cooling and solidification, molded plastic parts are obtained. They are widely used in various industries and fields.

[0003] The injection mold head is a key component in injection molds, responsible for guiding molten plastic from the injection machine nozzle to the mold cavity. Its design and performance directly affect the quality of the plastic parts, production efficiency, and mold life. The injection mold head mainly consists of a body and an injection port. The body has a feeding channel connected to the injection port. The raw material flows through the feeding channel to the injection port and is injected into the mold cavity. The body usually also has a switching element that controls the opening and closing of the feeding channel. After injection, the switching element closes the feeding channel to prevent further material from being delivered to the injection port. However, in actual use, after a product is injection molded, although the switching element closes and cuts off further material from the feeding channel, some raw material still remains in the feeding channel within the body. After the injection port is removed from the current mold, there is a tendency for raw material in the feeding channel to leak out, which needs further improvement. Utility Model Content

[0004] To further reduce material leakage at the injection port, this application provides a two-color injection mold head.

[0005] This application provides a two-color injection mold head, which adopts the following technical solution: A two-color injection mold head includes a mold head body, an injection port at one end of the mold head body, a first material channel inside the mold head body, a hollow interior of the mold head body rotatably connected to a mandrel, an outer material channel formed between the end of the mandrel and the mold head body, the outer material channel communicating with the injection port, a first connecting groove for connecting the outer material channel and the first material channel on the mandrel, the mandrel being axially slidably connected within the mold head body, and an insertion end at the end of the mandrel adapted to the injection port.

[0006] Optionally, the mandrel has an inner material channel at its center, one end of which is a through-hole. The die head body has a second material channel, and the mandrel has a second connecting groove for connecting the second material channel and the inner material channel. An inner rod for closing the second connecting groove is axially slidably connected inside the inner material channel.

[0007] Optionally, the die head body is provided with a first drive source for driving the mandrel to move axially and a second drive source for driving the inner rod to move axially. The first drive source includes a first cylinder and a first piston. The first piston is slidably connected to the first cylinder and is connected to the mandrel. The second drive source includes a second piston. The first piston has a sliding cavity. The second piston is slidably connected to the sliding cavity and is connected to the inner rod.

[0008] Optionally, the mold head body includes a main body and a head. The head is threadedly connected to the main body, and an injection head is axially slidably connected to the head. The injection port is disposed on the injection head and is tapered, with the diameter of the injection port gradually decreasing from the outside to the inside.

[0009] Optionally, the diameter of the first connecting groove is larger than the diameter of the second connecting groove.

[0010] Optionally, the mandrel has three rotation states: in the first rotation state, the first material channel is not connected to the first connecting groove and the second material channel is not connected to the second connecting groove; in the second rotation state, the first material channel is connected to the first connecting groove and the second material channel is not connected to the second connecting groove; in the third rotation state, the first material channel is connected to the first connecting groove and the second material channel is connected to the second connecting groove.

[0011] Optionally, it also includes a base, on which a drive cylinder is provided, one end of the drive cylinder being ball-jointed to the base, and the other end of the drive cylinder being ball-jointed to the spindle.

[0012] Optionally, the drive cylinder includes a second cylinder body, in which chambers are symmetrically arranged. Each chamber is slidably connected to a piston body, and each piston body is connected to a piston rod. One end of each piston rod extends through both ends of the cylinder body for ball joint connection.

[0013] Optionally, the ends of the piston rods are threaded with hinges, the hinges have mounting holes, a ball is ball-jointed in the mounting holes, and a through hole for connection is provided through the ball.

[0014] Optionally, the second cylinder is provided with cooling pipes, and the cylinder is provided with an inlet and an outlet communicating with the cooling pipes.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. The rotation of the mandrel can not only open and close the first material channel, but also close the outer material channel by driving the mandrel axially after the product injection is completed, thanks to the cooperation between the plug end and the injection port. This effectively prevents material leakage when switching injection molds, realizing the multi-purpose use of the mandrel. The overall structure is simple and compact. 2. The special design of the inner and outer material channels allows for the simultaneous supply of two raw materials, ultimately achieving the injection molding effect where the outer material of the product wraps around the inner material. This allows for the selection of raw materials with different costs for simultaneous injection molding as needed, thereby reducing raw material costs. 3. The combined design of the first and second drive sources allows the second piston to move first when oil is supplied to the cylinder. At this time, the inner rod can close the second connecting groove. Then, the first piston is driven to move, which drives the mandrel to move and achieve the engagement of the insertion end with the injection port, thus closing the external material channel. Finally, the mandrel moves automatically with a delay relative to the inner rod. Only one oil supply action is needed to drive the movement of the inner rod and the mandrel. Compared with setting two separate drive sources, the overall structure is more compact and simple. 4. Through the special design of the drive cylinder, the length can be adjusted in three states, and the piston body is located at the end of the chamber in each state, which has better stability and accuracy. The design of the cooling pipe on the second cylinder can realize circulating cooling, which has a good cooling effect on the drive cylinder and avoids the temperature from being too high during operation. In addition, the ball joints at both ends of the drive cylinder can not only adapt to the rotation adjustment of the spindle, but also adapt to the fine adjustment of the axial movement of the spindle, which has good applicability. Attached Figure Description

[0016] Figure 1 This is a structural diagram from a first perspective of an embodiment of this application.

[0017] Figure 2 This is a structural diagram from a second perspective of an embodiment of this application.

[0018] Figure 3 This is a front view of the first state of the embodiment of this application.

[0019] Figure 4 This is a cross-sectional view of the first state of the embodiment of this application.

[0020] Figure 5 This is a front view of the second state of the embodiment of this application.

[0021] Figure 6 This is a cross-sectional view of the second state of the embodiment of this application.

[0022] Figure 7 This is a front view of the third state of the embodiment of this application.

[0023] Figure 8 This is a cross-sectional view of the third state of the embodiments of this application.

[0024] Figure 9 This is a side view of the mandrel from the first perspective in an embodiment of this application.

[0025] Figure 10 This is a side view of the mandrel from a second perspective in an embodiment of this application.

[0026] Figure 11 This is a side view of the mandrel from a third perspective in an embodiment of this application.

[0027] Figure 12 This is a perspective view of the mandrel in an embodiment of this application.

[0028] Figure 13 This is a perspective view of the drive cylinder in an embodiment of this application.

[0029] Figure 14 This is a cross-sectional view of the drive cylinder in an embodiment of this application.

[0030] Figure 15 This is a structural diagram of the hinge component in an embodiment of this application.

[0031] Figure 16 yes Figure 6 Enlarged view of point A in the middle.

[0032] Explanation of reference numerals in the attached figures: 1. Mold head body; 2. Base; 3. Drive cylinder; 4. First material channel; 5. Second material channel; 6. Mandrel; 7. Injection port; 8. Outer material channel; 9. Inner material channel; 10. Inlet; 11. First connecting groove; 12. Second connecting groove; 13. Insertion end; 14. Inner rod; 15. First cylinder body; 16. First piston; 17. Second piston; 18. Slide cavity; 19. Oil supply port; 20. Second cylinder body; 21. Chamber; 22. Piston body; 23. Piston rod; 24. Oil passage port; 25. Hinge; 26. Mounting hole; 27. Ball; 28. Perforation; 29. ​​End cap; 30. Liquid inlet pipe; 31. Liquid return pipe; 32. Liquid inlet; 33. Liquid return port; 34. Main body; 35. Head; 36. Injection head; 37. Convex ring; 38. Retaining ring. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-15 This application will be described in further detail.

[0034] A two-color injection mold head, such as Figures 1-4As shown, the device includes a mold head body 1, a base 2, and a drive cylinder 3. Both the mold head body 1 and the drive cylinder 3 are mounted on the base 2. The mold head body 1 has a first material channel 4 and a second material channel 5 symmetrically arranged inside. The mold head body 1 is hollow at its center and rotatably connected to a mandrel 6. The end of the mold head body 1 has an injection port 7. An outer material channel 8 is formed between the mandrel 6 and the inner wall of the mold head body 1. One end of the outer material channel 8 is connected to the injection port 7, and the other end of the outer material channel 8 is used to connect to the first material channel 4. An inner material channel 9 is arranged at the center of the mandrel 6, and one end of the inner material channel 9 passes through the mandrel 6. The end is connected to the outer material channel 8 and the injection port 7. The inner material channel 9 is used to connect with the second material channel 5. The base 2 has a feed port 10 that connects with the first material channel 4 and the second material channel 5. The spindle 6 has a first connecting groove 11 and a second connecting groove 12. The first connecting groove 11 is used to connect the first material channel 4 and the outer material channel 8. The second connecting groove 12 is used to connect the second material channel 5 and the inner material channel 9. In actual use, the position of the first connecting groove 11 and the second connecting groove 12 can be switched by rotating the spindle 6, thereby realizing the switching between opening and closing of the connection with the first material channel 4 and the second material channel 5.

[0035] like Figure 4-12 As shown, the first connecting groove 11 and the second connecting groove 12 on the mandrel 6 are symmetrically designed, and the opening of the first connecting groove 11 is larger than the opening of the second connecting groove 12. In actual use, rotating the mandrel 6 can make the first connecting groove 11 connect with the first material channel 4 first. After rotating the mandrel 6, the first connecting groove 11 and the first material channel 4 and the second connecting groove 12 and the second material channel 5 can be connected at the same time to achieve simultaneous material feeding.

[0036] like Figures 3-8 As shown, the mandrel 6 has three rotation states. In the first rotation state, the first material channel 4 and the first connecting groove 11 are not connected, and the second material channel 5 and the second connecting groove 12 are not connected. That is, in this state, the material supply to the injection port 7 is stopped. See the first rotation state for details. Figure 4 In the second rotation state, the first connecting groove 11 is connected to and corresponds to the first material channel 4. The raw material in the first material channel 4 flows through the first connecting groove 11 to the outer material channel 8, and is finally discharged from the injection port 7 to achieve injection molding. At this time, the second connecting groove 12 is not connected to the second material channel 5, and the inner material channel 9 does not supply material. See the second rotation state for details. Figure 6 In the third rotation state, the first material channel 4 is connected to the first connecting groove 11 and the second material channel 5 is connected to the second connecting groove 12. At this time, the raw material in the first material channel 4 is fed to the outer material channel 8, and the raw material in the second material channel 5 is fed to the inner material channel 9, achieving simultaneous feeding. See the third rotation state for details. Figure 8 .

[0037] In this way, during the actual injection molding process, the material can be fed from the outer material channel 8 first. After the material is fed from the outer material channel 8 for a period of time, the material from both the outer material channel 8 and the inner material channel 9 can be fed simultaneously. Finally, the material supply from the inner material channel 9 is closed first, and the material supply from the outer material channel 8 is then completed. This ensures that the molded product has a structure in which the outer material completely encloses the inner material. This results in the outer surface of the molded product being entirely filled with the material from the first material channel 4, while the material from the second material channel 5 is completely inside. In practical use, the material from the second material channel 5 can be made from relatively low-cost materials, while the material from the first material channel 4 can be made from higher-cost and higher-quality materials. This effectively reduces material costs and results in a higher quality product. It achieves the injection molding of two materials with a single injection mold head, and the overall structure is compact and simple. The feeding of the two material channels can be combined by driving the mandrel 6 to rotate, making the operation simple and convenient.

[0038] like Figure 8 As shown, the mandrel 6 is axially slidably connected inside the mold head body 1, and has a plug end 13 at the end of the mandrel 6 that is adapted to the injection port 7. At the same time, a first drive source is provided on the mold head body 1 to drive the mandrel 6 to move axially. In this way, the plug end 13 is driven by the first drive source to cooperate with the injection port 7, thereby achieving the closure of the injection port 7. At this time, the external material channel 8 cuts off the connection with the injection port 7, thereby effectively preventing material leakage when the injection port 7 is switched to the injection mold. This realizes the multi-purpose use of the mandrel 6, and the overall structure is simple and compact. At the same time, an inner rod 14 for closing the second connecting groove 12 is axially slidably connected in the inner material channel 9. The second connecting groove 12 is located on the moving path of the inner rod 14. A second drive source is provided on the mold head body 1 to drive the inner rod 14 to move axially. The movement of the inner rod 14 by the second drive source can achieve the closure of the second connecting groove 12, preventing the material in the second material channel 5 from continuously entering the inner material channel 9. Combined with the rotation and closure of the mandrel 6, a double closure effect is achieved.

[0039] like Figure 8As shown, the first driving source includes a first cylinder 15 and a first piston 16. The first piston 16 is slidably connected inside the first cylinder 15 and is connected to the spindle 6. The second driving source includes a second piston 17. A sliding cavity 18 is provided on the first piston 16, and the second piston 17 is slidably connected inside the sliding cavity 18. The second piston 17 is connected and fixed to the inner rod 14 by a rod. The volume of the second piston 17 is smaller than that of the first piston 16. The end of the first cylinder 15 away from the spindle 6 has an oil supply port 19 for supplying oil to its interior. Oil enters the first cylinder 15 through the oil supply port 19 to drive it. Since the volume and weight of the second piston 17 are smaller than those of the first piston 16, the second piston 17 will be pushed forward first. The inner rod 14 moves forward to first close the second connecting groove 12, and then the oil drives the first piston 16. Moving forward drives the mandrel 6 to move forward synchronously, achieving the engagement of the insertion end 13 with the injection port 7; a single oil supply and pressurization action is sufficient to drive the inner rod 14 and the mandrel 6 forward sequentially to achieve sealing, making the entire structure more compact and the operation simpler and more convenient; when it is necessary to drive the inner rod 14 and the mandrel 6 back to their original positions, after the oil in the first cylinder 15 is depressurized, it is only necessary to maintain the connection between the first material channel 4 and the first connecting groove 11. At this time, the raw material in the first material channel 4 continuously enters the outer material channel 8, and the increased pressure will first push the mandrel 6 back to its original position, disengaging the insertion end 13 from the injection port 7. At the same time, some raw material enters the inner material channel 9 and pushes the inner rod 14 back to its original position, so that the inner rod 14 no longer blocks the second connecting groove 12, ensuring that the raw material in the second material channel 5 can enter the inner material channel 9 through the second connecting groove 12.

[0040] like Figure 1 , Figure 13 and Figure 14As shown, the drive cylinder 3 is used to drive the spindle 6 to rotate to switch different rotation states. The drive cylinder 3 includes a second cylinder body 20, which has two chambers 21 symmetrically arranged inside. A piston body 22 is slidably connected to each chamber 21, and a piston rod 23 is connected to each piston body 22. The ends of the two piston rods 23 away from the piston body 22 protrude from both ends of the second cylinder body 20, respectively. The end of one piston rod 23 is ball-jointed to the base 2, and the end of the other piston rod 23 is ball-jointed to the spindle 6. At the same time, an oil port 24 for communicating with the chambers 21 is provided at the bottom of the second cylinder body 20. By supplying oil to different sides of the piston body 22, the piston body 22 can be driven to reciprocate in the chambers 21. The movement is achieved by using a single drive cylinder 3 to move the two pistons 22 to different positions at the end of the chamber 21, thereby enabling the drive cylinder 3 to extend and retract in three different lengths. These three length extensions correspond to three rotational states of the spindle 6. This driving method ensures that the pistons 22 are always located at the end of the chamber 21 in all three length switching states, resulting in better accuracy and stability. If the pistons 22 were located in the middle of the chamber 21 and stopped to correspond to the corresponding state, it would be difficult to control and the accuracy would be unstable. A single drive cylinder 3 can achieve stable switching between the three extension lengths, ultimately achieving stable and accurate rotation of the spindle 6. The structure is compact and practical.

[0041] like Figures 13-15 As shown, a hinge 25 is threadedly connected to the end of the piston rod 23 extending out of the second cylinder 20. A mounting hole 26 is provided in the center of the hinge 25. A ball 27 is mounted in the mounting hole 26 by a ball joint. A through hole 28 is provided in the center of the ball 27 for connection. The ball 27 is connected to the base 2 and the spindle 6 through the through hole 28. First, the threaded connection between the hinge 25 and the piston rod 23 can be disassembled and replaced. In actual use, the axial length can be finely adjusted by rotating the hinge 25. In addition, the ball joint connection can not only adapt to the switching of the circumferential rotation of the spindle 6, but also to the appropriate movement of the spindle 6 in the axial direction. It has good adaptability and ensures that the spindle 6 can not only rotate circumferentially, but also move axially without interference or jamming.

[0042] like Figure 13As shown, end caps 29 are provided at both ends of the first cylinder body 15. A cooling pipe is provided between the two end caps 29 to connect them. The cooling pipe includes an inlet pipe 30 and a return pipe 31. At the same time, an inlet port 32 and a return port 33 are provided at the bottom of one of the end caps 29. The inlet port 32 is connected to the inlet pipe 30, and the return pipe 31 is connected to the return port 33. A flow channel connecting the inlet pipe 30 and the return pipe 31 is provided inside the end cap 29. The coolant enters the inlet pipe 30 from the inlet port 32, flows through the drive cylinder 3, and then exits through the return pipe 31 and the return port 33, realizing the circulation of the coolant. This achieves good cooling of the drive cylinder 3, thereby preventing the overheating phenomenon caused by the drive cylinder 3 being close to the injection mold head, ensuring the continuous good use of the drive cylinder 3, and effectively improving its durability.

[0043] like Figure 6 and Figure 16 As shown, the mold head body 1 includes a main body 34 and a head 35. The head 35 is threadedly connected to the main body 34 for detachable connection. An injection head 36 is axially slidably connected to the head 35. The injection port 7 is located at the center of the injection head 36, and the diameter of the injection port 7 gradually decreases from the outside to the inside. The conical design of the injection port 7 and the axial sliding connection of the injection head 36 ensure that, after injection molding, during the separation of the injection head 36 from the mold, the material break point will be located at the end of the smallest diameter of the injection port 7, achieving accurate material break position. In this way, the material break position is located inside the injection head 36, where the temperature is higher, which can ensure that the injected raw material is in a good molten state and has good fluidity when the next product is injected. The injection head 36 has a protruding ring 37 at the end inside the head 35, and a retaining ring 38 is threadedly connected to the end of the injection head 36 outside the head 35. The combination of the retaining ring 38 and the protruding ring 37 can limit the stroke of the axial movement of the injection head 36. The threaded connection of the retaining ring 38 is detachable, which facilitates the installation and removal of the injection head 36.

[0044] The working principle of this embodiment is as follows: Initially, both the first connecting groove 11 and the second connecting groove 12 are closed. When injection molding begins, the drive cylinder 3 drives the mandrel 6 to rotate to the second rotation state. The raw material in the first material channel 4 flows into the outer material channel 8 through the first connecting groove 11. Then, the mandrel 6 is pushed to retract axially, and the raw material in the outer material channel 8 enters the injection port 7 and is injected into the injection mold. At the same time, the raw material in the outer material channel 8 pushes the inner rod 14 to retract, no longer closing the second connecting groove 12. After the raw material in the first material channel 4 has been injected for a period of time, the drive cylinder 3 drives the mandrel 6 to rotate to the third rotation state. At this time, the outer material channel 12 is closed. While material is being supplied from material channel 8, the material in the second material channel 5 flows through the inner material channel 9 to the injection port 7 and enters the injection mold together, realizing the simultaneous injection of the two materials. When the injection is about to end, the drive cylinder 3 drives the mandrel 6 to rotate to the second rotation state, allowing the material in the outer material channel 8 to finish. Finally, the drive cylinder 3 drives the mandrel 6 to rotate to the first rotation state, realizing the simultaneous closure of the first material channel 4 and the second material channel 5. Then, oil is introduced into the first cylinder 15 to pressurize it, driving the inner rod 14 to move forward and block the second connecting groove 12. After that, the mandrel 6 is continuously driven forward so that the insertion end 13 cooperates with the injection port 7 to achieve closure.

[0045] 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 mold head, characterized in that: The device includes a mold head body (1), one end of which is provided with an injection port (7). A first material channel (4) is provided inside the mold head body (1). The mold head body (1) is hollow inside and rotatably connected to a mandrel (6). An outer material channel (8) is formed between the end of the mandrel (6) and the mold head body (1). The outer material channel (8) is connected to the injection port (7). A first connecting groove (11) for connecting the outer material channel (8) and the first material channel (4) is provided on the mandrel (6). The mandrel (6) is axially slidably connected inside the mold head body (1). The end of the mandrel (6) has a plug-in end (13) adapted to the injection port (7).

2. The two-color injection mold head according to claim 1, characterized in that: The mandrel (6) has an inner material channel (9) at its center. One end of the inner material channel (9) passes through the insertion end (13). The die head body (1) has a second material channel (5). The mandrel (6) has a second connecting groove (12) for connecting the second material channel (5) and the inner material channel (9). The inner material channel (9) has an inner rod (14) for closing the second connecting groove (12) axially slidably connected inside the inner material channel (9).

3. A two-color injection mold head according to claim 2, characterized in that: The die head body (1) is provided with a first drive source for driving the spindle (6) to move axially and a second drive source for driving the inner rod (14) to move axially. The first drive source includes a first cylinder (15) and a first piston (16). The first piston (16) is slidably connected in the first cylinder (15) and is connected to the spindle (6). The second drive source includes a second piston (17). The first piston (16) has a sliding cavity (18) opened on it. The second piston (17) is axially slidably connected in the sliding cavity (18) and is connected to the inner rod (14).

4. A two-color injection mold head according to claim 1 or 3, characterized in that: The mold head body (1) includes a main body (34) and a head (35). The head (35) is threadedly connected to the main body (34). An injection head (36) is axially slidably connected to the head (35). The injection port (7) is set on the injection head (36). The injection port (7) is conical and its diameter gradually decreases from the outside to the inside.

5. A two-color injection mold head according to claim 2, characterized in that: The diameter of the first connecting groove (11) is larger than the diameter of the second connecting groove (12).

6. A two-color injection mold head according to claim 5, characterized in that: The mandrel (6) has three rotation states. In the first rotation state, the first material channel (4) is not connected to the first connecting groove (11) and the second material channel (5) is not connected to the second connecting groove (12). In the second rotation state, the first material channel (4) is connected to the first connecting groove (11) and the second material channel (5) is not connected to the second connecting groove (12). In the third rotation state, the first material channel (4) is connected to the first connecting groove (11) and the second material channel (5) is connected to the second connecting groove (12).

7. A two-color injection mold head according to claim 1 or 3, characterized in that: It also includes a base (2), on which a drive cylinder (3) is provided. One end of the drive cylinder (3) is ball-jointed to the base (2), and the other end of the drive cylinder (3) is ball-jointed to the spindle (6).

8. A two-color injection mold head according to claim 7, characterized in that: The drive cylinder (3) includes a second cylinder body (20), in which chambers (21) are symmetrically arranged. Each chamber (21) is slidably connected to a piston body (22), and each piston body (22) is connected to a piston rod (23). One end of each piston rod (23) passes through both ends of the second cylinder body (20) for ball joint connection.

9. A two-color injection mold head according to claim 8, characterized in that: The piston rod (23) is threaded to the end of a hinge (25), and the hinge (25) is provided with a mounting hole (26). A ball (27) is ball-jointed in the mounting hole (26), and a through hole (28) for connection is provided through the ball (27).

10. A two-color injection mold head according to claim 8, characterized in that: The second cylinder (20) is provided with a cooling pipe, and the second cylinder (20) is provided with an inlet (32) and an outlet (33) connected to the cooling pipe.

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