Combined multicolor injection mold

Abstract

The invention discloses a combined multicolor injection mold, and relates to the technical field of multicolor injection molding, the combined multicolor injection mold comprises a bottom mold, the top surface of the bottom mold is fixedly connected with a female mold, the top surface of the female mold is provided with a guide hole, the top surface of the bottom mold is fixedly connected with a fixed cylinder, and a telescopic rod is slidably sleeved in the fixed cylinder; the multi-color injection mold has the advantages that the multi-color injection mold does not need to consider discharge of plastic parts, so that the mold design difficulty is reduced, meanwhile, a part arrangement device is not needed, electrical circuits are reduced, meanwhile, the cost is further reduced, meanwhile, the mold cavities of the mold can be detached, the mold cavities can be finely carved in blocks, and therefore the design of the multi-color injection mold is simple and convenient, and the production efficiency is improved. Integrated fine carving is not needed, internal details of a complex cavity can be controlled, the quality of multicolor plastic parts is guaranteed, the production cost of the mold is reduced, control over cooling water during mold cooling does not need additional electrical elements, and automatic regulation and control can be achieved according to the specific process during mold working.

Description

Technical Field

[0001] The invention relates to the technical field of multi-color injection molding, in particular to a combined multi-color injection molding mold. Background Art

[0002] Combined multi-color injection molding, also known as two-color injection molding or multi-color injection molding, uses special injection molding technology and equipment to achieve combined molding of multiple color materials in one injection molding process. This technology controls the injection order, amount and position of different color materials, as well as the design and cooling system of the mold to ensure that the various materials do not penetrate each other during the molding process and are strictly distinguished. Mold design is the key to combined multi-color injection molding. It is necessary to ensure that different materials can be accurately distributed in various parts of the mold during the injection molding process and are not allowed to penetrate each other.

[0003] After searching, Chinese patent number CN217531648U discloses a combined multi-color injection mold. Although it is convenient to install the injection mold body and the turntable, the mold design of multi-color injection is relatively complicated. The one-piece precision carving cannot control the details inside the complex cavity, which not only affects the quality of multi-color plastic parts, but also increases the cost of mold production. At the same time, the discharge of plastic parts needs to be considered after the multi-color injection mold is separated, which increases the difficulty of mold design. At the same time, an additional arrangement device needs to be set up, which increases the electrical circuit and further increases the cost. In addition, the control of cooling water inflow during mold cooling requires the participation of additional electrical components, and cannot be automatically adjusted according to the specific process of the mold working. Summary of the invention

[0004] The purpose of the present invention is to provide a combined multi-color injection mold.

[0005] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a combined multi-color injection mold, comprising a bottom mold, the top surface of the bottom mold is fixedly connected to a concave mold, the top surface of the concave mold is provided with a guide hole, and the top surface of the bottom mold is fixedly connected to a fixed cylinder, a telescopic rod is slidably sleeved in the fixed cylinder, one end of the telescopic rod is fixedly connected to a first piston, the other end of the telescopic rod is fixedly connected to a top mold, an injection hole is through-opened on the top mold, and a first sealing cavity is provided in the top mold, a sliding groove is provided on the bottom surface of the top mold, a slider is slidably sleeved in the sliding groove, a punch is fixedly connected to the bottom surface of the slider, a guide column is fixedly connected to the bottom surface of the punch, and a flow channel is provided in the punch, and the bottom surface of the top mold is fixedly connected to a combined mold; A connecting tube is fixedly sleeved in the top mold, one end of the connecting tube is communicated with the first sealed cavity, and the other end of the connecting tube is communicated with the telescopic rod, the telescopic rod is a hollow tubular structure, a second piston is slidably sleeved in the first sealed cavity, one end of the first pull rope is fixedly connected to the end surface of the second piston, the other end of the first pull rope is in contact with the slider, and the first guide wheel and the second guide wheel are slidably sleeved on the outer surface of the first pull rope, and a return spring is fixedly connected between the slider and the end surface of the slide groove; The end of the first pull rope is fixedly connected to one end of the second pull rope, the other end of the second pull rope is wound with a roller, the bottom surface of the roller is fixedly connected to one end of the transmission shaft, the other end of the transmission shaft is fixedly connected to a gear, the outer surface of the gear is meshed with a rack, the end of the rack is fixedly connected to a sealing ring, an inclined cavity is provided at the port of the flow channel, a second sealing cavity is provided in the punch, one end of a guide rod is slidably sleeved in the second sealing cavity, and the other end of the guide rod is fixedly connected to a blocking ball.

[0006] As a further solution of the present invention: there are two fixed cylinders and two telescopic rods, and the two fixed cylinders and the two telescopic rods are symmetrically arranged with respect to the bisecting plane of the bottom mold, the first piston is slidably sleeved with the fixed cylinder, there are four punches, and the four punches are evenly stepped about the central axis of the die, and the four punches, the combined mold and the die together form a cavity, there are multiple injection holes, and the multiple injection holes are connected to the cavity.

[0007] As a further solution of the present invention: the cross-sections of the slide groove and the slider are both T-shaped, and the slide groove and the slider correspond to the punch one-to-one, the guide column and the guide hole are slidably connected, the first sealing cavity is arranged parallel to the slide groove, the flow channel corresponds to the punch one-to-one, and the ports of the flow channel are in contact with each other.

[0008] As a further solution of the present invention: the connecting tube is arranged in a Y shape, and there are two connecting tubes, and the two connecting tubes are symmetrically arranged about the bisecting plane of the top mold, the first pull rope is distributed in a "X" shape, the first pull rope is slidably sleeved with the top mold, and one end of the first pull rope extends into the first sealing cavity, and the other end of the first pull rope extends into the slide groove, a fixed sealing plug is arranged between the first pull rope and the top mold, and there are two first guide wheels, one first guide wheel is rotatably connected to the inner surface of the first sealing cavity, the other first guide wheel is slidably sleeved with the top mold, and the second guide wheel is rotatably connected to the side wall of the slide groove.

[0009] As a further solution of the present invention: the second piston pulls the slider and the punch to translate through the first pull rope, the first guide wheel and the second guide wheel.

[0010] As a further solution of the present invention: the roller is rotatably sleeved with the slider, the second pull rope is slidably sleeved with the slider, and a torsion spring is fixedly connected between the roller and the slider, the transmission shaft and the gear are both rotatably sleeved with the punch, and the rack is slidably sleeved with the punch.

[0011] As a further solution of the present invention: the sealing ring is sleeved with the port of the flow channel, the sealing ring is slidably sleeved with the side wall of the punch, the bottom end of the second sealing cavity is connected with the exhaust duct of the punch, the blocking ball is slidably sleeved with the inclined cavity, and the diameter of the blocking ball is larger than the diameter of the flow channel.

[0012] As a further solution of the present invention: the blocking ball is sleeved and engaged with the flow channel, and the convex mold pushes the guide rod upward through compressed air.

[0013] Adopting the above technical solution: Compared with the prior art, the beneficial effects of the present invention are: The present invention drives four punches to gather toward the center through a slider until the punches contact each other and clamp the combined mold. At this time, the die and the punch are not closed. Due to the continuous driving of the injection molding machine, the guide pin on the punch is inserted into the guide hole on the die until the closing is completed. After the multi-color plastic parts are injection molded, the bottom mold and the die are reset by the injection molding machine, so that the reset spring on the slider limits the contact, and the reset spring drives the slider and the punch to reset, so that the four punches are dispersed and the combined mold is exposed, so that the cavity of the mold is separated, and then the restrictions on the plastic parts are completely released, so that the plastic parts fall naturally, so that the multi-color injection mold does not need to consider the discharge of the plastic parts, thereby reducing the difficulty of mold design, and at the same time, no arrangement device is required, and while reducing electrical circuits, the cost is further reduced.

[0014] The first pull rope of the present invention is further stretched, and the punch and the slider cannot move at this time, so that a relative displacement occurs between the first pull rope and the slider, so that the first pull rope pulls one end of the second pull rope and compresses the torsion spring, and then the other end of the second pull rope drives the roller to rotate, so that the roller drives the gear to rotate through the transmission shaft, so that the gear drives the rack to translate, so that the rack pushes the sealing ring to extend out of the punch, and then the sealing rings are squeezed against each other, so that the flow channel ports on the four punches can all be sealed, so that the closing of the four punches after the mold is separated does not affect the sealing of the flow channel, so that the cavity of the mold can be fully split, so that the cavity can be divided into blocks for fine carving, and then the design of the mold for multi-color injection molding is relatively simple, without the need for integrated fine carving, and the internal details of the complex cavity can be controlled, which not only ensures the quality of multi-color plastic parts, but also reduces the cost of mold production.

[0015] The present invention injects molten material so that the air in the cavity flows into the bottom end of the second sealed cavity along the exhaust duct, so that the compressed air lifts the top end of the guide rod, thereby causing the guide rod to lift the baffle ball, causing the baffle ball to slide into the top end of the inclined cavity, and then the baffle ball no longer seals the flow channel, so that the flow channels in the four punches are completely unobstructed. In this process, no human control is required, so that the control of cooling water during mold cooling does not require the participation of additional electrical components, and can be automatically adjusted according to the specific progress of the mold when it is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a combined multi-color injection mold of the present invention; Figure 2 It is a bottom view schematic diagram of the top mold structure in an embodiment of the present invention; Figure 3 A half-section schematic diagram of a top mold structure in an embodiment of the present invention; Figure 4 In the embodiment of the present invention Figure 3 A magnified view of the structure of part A; Figure 5 This is a schematic diagram of the structure of the first sealed cavity in an embodiment of the present invention; Figure 6 In the embodiment of the present invention Figure 5 A magnified view of the structure of part B; Figure 7 It is a schematic cross-sectional view of the male mold structure in an embodiment of the present invention; Figure 8 In the embodiment of the present invention Figure 7 A magnified view of the structure of part C in the middle; Fig. 9 Schematic diagram of the sealing ring structure in an embodiment of the present invention.

[0017] In the figure: 1. bottom mold; 2. concave mold; 3. guide hole; 4. fixed cylinder; 5. telescopic rod; 6. first piston; 7. top mold; 8. injection hole; 9. first sealing chamber; 10. slide groove; 11. slider; 12. punch; 13. guide column; 14. combined mold; 15. flow channel; 16. connecting pipe; 17. second piston; 18. first pull rope; 19. first guide wheel; 20. second guide wheel; 21. second pull rope; 22. roller; 23. transmission shaft; 24. gear; 25. rack; 26. sealing ring; 27. return spring; 28. oblique chamber; 29. ​​second sealing chamber; 30. guide rod; 31. ball stop. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example 1

[0019] See also Figure 1-Figure 6 The present invention provides a technical solution: a combined multi-color injection mold, including a bottom mold 1, a top surface of the bottom mold 1 is fixedly connected to a cavity 2, a top surface of the cavity 2 is provided with a guide hole 3, and a top surface of the bottom mold 1 is fixedly connected to a fixed cylinder 4, a telescopic rod 5 is slidably sleeved in the fixed cylinder 4, one end of the telescopic rod 5 is fixedly connected to a first piston 6, and the other end of the telescopic rod 5 is fixedly connected to a top mold 7, an injection hole 8 is through-opened on the top mold 7, and a first sealing cavity 9 is provided in the top mold 7, a slide groove 10 is provided on the bottom surface of the top mold 7, a slider 11 is slidably sleeved in the slide groove 10, a punch 12 is fixedly connected to the bottom surface of the slider 11, a guide column 13 is fixedly connected to the bottom surface of the punch 12, and a flow channel 15 is provided in the punch 12, and a combined mold 14 is fixedly connected to the bottom surface of the top mold 7.

[0020] See also Figure 1 , Figure 2 and Figure 4 There are two fixed cylinders 4 and two telescopic rods 5, and the two fixed cylinders 4 and the two telescopic rods 5 are symmetrically arranged with respect to the bisecting plane of the bottom mold 1. The first piston 6 is slidably sleeved with the fixed cylinder 4. There are four punches 12, and the four punches 12 are evenly stepped about the central axis of the die 2. The four punches 12, the combined mold 14 and the die 2 together form a cavity. There are multiple injection holes 8, and the multiple injection holes 8 are connected to the cavity.

[0021] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 The cross sections of the slide groove 10 and the slider 11 are both T-shaped, and the slide groove 10 and the slider 11 correspond to the punch 12 one by one, the guide column 13 is slidably connected to the guide hole 3, the first sealing cavity 9 is arranged parallel to the slide groove 10, the flow channel 15 corresponds to the punch 12 one by one, and the ports of the flow channel 15 are in contact with each other.

[0022] Specifically, in the process of closing the female mold 2 and the male mold 12, as the bottom mold 1 and the female mold 2 move forward, the fixed cylinder 4 on the bottom mold 1 is gradually sleeved with the telescopic rod 5, so that the telescopic rod 5 compresses the air in the fixed cylinder 4 through the first piston 6, so that the compressed air flows into the connecting tube 16 through the telescopic rod 5, and is guided by the connecting tube 16 so that the compressed air enters the first sealed cavity 9, and then the second piston 17 in the first sealed cavity 9 is compressed and translated, so that the second piston 17 pulls one end of the first pull rope 18 to move, so that the other end of the first pull rope 18 is guided by the first guide wheel 19 and the second guide wheel 20 to pull the slider 11 to move in opposite directions, so that the slider 11 drives the four male molds 12 to gather toward the center until the male molds 12 contact each other and clamp Tighten the combined mold 14. At this time, the die 2 and the punch 12 are not closed. Due to the continuous driving of the injection molding machine, the guide post 13 on the punch 12 is inserted into the guide hole 3 on the die 2 until the closing is completed. After the multi-color plastic parts are injected, the bottom mold 1 and the die 2 are reset by the injection molding machine, so that the reset spring 27 on the slider 11 limits the contact, and the reset spring 27 drives the slider 11 and the punch 12 to reset, so that the four punches 12 are dispersed and the combined mold 14 is exposed, so that the cavity of the mold is separated, and then the restrictions on the plastic parts are completely released, so that the plastic parts fall naturally, so that the multi-color injection mold does not need to consider the discharge of the plastic parts, thereby reducing the difficulty of mold design, and at the same time, there is no need for a piece arrangement device, reducing electrical circuits, and further reducing costs. Example 2

[0023] See also Figure 3 and Figure 5-Figure 8 The present invention provides a technical solution: a combined multi-color injection mold, a connecting tube 16 is fixedly sleeved in the top mold 7, one end of the connecting tube 16 is communicated with the first sealed cavity 9, and the other end of the connecting tube 16 is communicated with the telescopic rod 5, the telescopic rod 5 is a hollow tubular structure, a second piston 17 is slidably sleeved in the first sealed cavity 9, one end of the first pull rope 18 is fixedly connected to the end surface of the second piston 17, the other end of the first pull rope 18 is in contact with the slider 11, and the outer surface of the first pull rope 18 is slidably sleeved with the first guide wheel 19 and the second guide wheel 20, and a return spring 27 is fixedly connected between the slider 11 and the end surface of the slide groove 10.

[0024] See also Figure 5-Figure 7The connecting tube 16 is arranged in a Y shape, and there are two connecting tubes 16, and the two connecting tubes 16 are symmetrically arranged about the bisecting plane of the top mold 7. The first pull rope 18 is distributed in a "F" shape. The first pull rope 18 is slidably sleeved with the top mold 7, and one end of the first pull rope 18 extends into the first sealing cavity 9, and the other end of the first pull rope 18 extends into the slide groove 10. A fixed sealing plug is arranged between the first pull rope 18 and the top mold 7. There are two first guide wheels 19, one first guide wheel 19 is rotatably connected to the inner surface of the first sealing cavity 9, and the other first guide wheel 19 is slidably sleeved with the top mold 7. The second guide wheel 20 is rotatably connected to the side wall of the slide groove 10.

[0025] See also Figure 6 The second piston 17 pulls the slider 11 and the punch 12 to translate through the first pull rope 18, the first guide wheel 19 and the second guide wheel 20.

[0026] Specifically, when the four convex molds 12 are combined, as the injection molding machine is further driven, the air in the fixed cylinder 4 is further compressed. According to the above process, the first pull rope 18 is further stretched. At this time, the convex mold 12 and the slider 11 cannot move, so that the first pull rope 18 and the slider 11 are relatively displaced, so that the first pull rope 18 pulls one end of the second pull rope 21 and compresses the torsion spring, and then the other end of the second pull rope 21 drives the roller 22 to rotate, so that the roller 22 drives the gear 24 to rotate through the transmission shaft 23, so that the gear The wheel 24 drives the rack 25 to translate, so that the rack 25 pushes the sealing ring 26 to extend out of the punch 12, and then the sealing rings 26 are squeezed against each other, so that the ports of the flow channels 15 on the four punches 12 can be sealed, so that the closing of the mold after the four punches 12 are separated does not affect the sealing of the flow channels 15, so that the cavity of the mold can be fully split, and the cavity can be divided into blocks for fine carving, thereby making the design of the multi-color injection mold relatively simple, without the need for integrated fine carving, and the internal details of the complex cavity can be controlled, which not only ensures the quality of multi-color plastic parts, but also reduces the cost of mold production. Example 3

[0027] See also Figure 7-Figure 9 The present invention provides a technical solution: a combined multi-color injection mold, the end of the first pull rope 18 is fixedly connected to one end of the second pull rope 21, the other end of the second pull rope 21 is wound with a roller 22, the bottom surface of the roller 22 is fixedly connected to one end of a transmission shaft 23, the other end of the transmission shaft 23 is fixedly connected to a gear 24, the outer surface of the gear 24 is meshed with a rack 25, the end of the rack 25 is fixedly connected to a sealing ring 26, an oblique cavity 28 is opened at the end of the flow channel 15, a second sealing cavity 29 is opened in the punch 12, one end of a guide rod 30 is slidably sleeved in the second sealing cavity 29, and a blocking ball 31 is fixedly connected to the other end of the guide rod 30.

[0028] See also Figure 7 and Figure 8The roller 22 is rotatably sleeved with the slider 11, the second pull rope 21 is slidably sleeved with the slider 11, and a torsion spring is fixedly connected between the roller 22 and the slider 11, the transmission shaft 23 and the gear 24 are both rotatably sleeved with the punch 12, and the rack 25 is slidably sleeved with the punch 12.

[0029] See also Figure 2 , Figure 4 , Figure 5 and Figure 7 The sealing ring 26 is sleeved with the port of the flow channel 15, the sealing ring 26 is slidably sleeved with the side wall of the punch 12, the bottom end of the second sealing cavity 29 is connected to the exhaust duct of the punch 12, the blocking ball 31 is slidably sleeved with the inclined cavity 28, and the diameter of the blocking ball 31 is greater than the diameter of the flow channel 15.

[0030] See also Fig. 9 The blocking ball 31 is engaged with the flow channel 15, and the punch 12 pushes the guide rod 30 upward through compressed air.

[0031] Specifically, after the multi-color injection mold is closed, the punch 12, the die 2 and the combined mold 14 together constitute a cavity, and the injection molding machine then injects molten material into the cavity through the injection hole 8. At this time, as the molten material is injected, the air in the cavity flows into the bottom end of the second sealed cavity 29 along the exhaust duct, so that the compressed air lifts the top of the guide rod 30, thereby causing the guide rod 30 to lift the baffle ball 31, causing the baffle ball 31 to slide into the top of the inclined cavity 28, and then the baffle ball 31 no longer seals the flow channel 15, so that the flow channels 15 in the four punches 12 are completely unobstructed. In this process, no human control is required, so that the control of cooling water during mold cooling does not require the participation of additional electrical components, and can be automatically adjusted according to the specific progress of the mold when it is working.

[0032] The working principle and use process of the present invention are as follows: when it is necessary to produce multi-color plastic parts, the bottom mold 1 and the top mold 7 are fixed on the injection molding machine, and the cooling water pipeline is connected to the flow channel 15, and then the bottom mold 1 and the concave mold 2 are driven forward by the injection molding machine, so that the concave mold 2 and the convex mold 12 are molded together. In this process, as the bottom mold 1 and the concave mold 2 move forward, the fixed cylinder 4 on the bottom mold 1 is gradually sleeved with the telescopic rod 5, so that the telescopic rod 5 compresses the air in the fixed cylinder 4 through the first piston 6, so that the compressed air flows into the connecting pipe 16 through the telescopic rod 5, and is guided by the connecting pipe 16 so that the compressed air enters The first sealed cavity 9 is formed, and then the second piston 17 in the first sealed cavity 9 is pressed and translated, so that the second piston 17 pulls one end of the first pull rope 18 to move, so that the other end of the first pull rope 18 is guided by the first guide wheel 19 and the second guide wheel 20 to pull the slider 11 to move in opposite directions, so that the slider 11 drives the four punches 12 to gather toward the center until the punches 12 contact each other and clamp the combined mold 14. At this time, the die 2 and the punch 12 are not molded together. Due to the continuous driving of the injection molding machine, the guide column 13 on the punch 12 is inserted into the guide hole 3 on the die 2 until the mold is closed; During the above process, when the four convex molds 12 are combined, the air in the fixed cylinder 4 is further compressed as the injection molding machine is further driven. According to the above process, the first pull rope 18 is further stretched. At this time, the convex mold 12 and the slider 11 cannot move, so that a relative displacement occurs between the first pull rope 18 and the slider 11, so that the first pull rope 18 pulls one end of the second pull rope 21 and compresses the torsion spring, and then the other end of the second pull rope 21 drives the roller 22 to rotate, so that the roller 22 drives the gear 24 to rotate through the transmission shaft 23, so that the gear The wheel 24 drives the rack 25 to translate, so that the rack 25 pushes the sealing ring 26 out of the punch 12, and then the sealing rings 26 are squeezed against each other, so that the ports of the flow channels 15 on the four punches 12 can be sealed, so that the mold closing after the four punches 12 are separated does not affect the sealing of the flow channels 15, so that the mold cavity can be fully split, so that the mold cavity can be finely carved in blocks, and then the design of the multi-color injection mold is relatively simple, without the need for integral fine carving, and the internal details of the complex cavity can be controlled, which not only ensures the quality of the multi-color plastic parts, but also reduces the cost of mold production; After the multi-color injection mold is closed, the male mold 12, the female mold 2 and the combined mold 14 together form a mold cavity, and the injection molding machine then injects molten material into the mold cavity through the injection hole 8. At this time, as the molten material is injected, the air in the mold cavity flows into the bottom end of the second sealed cavity 29 along the exhaust duct, so that the compressed air lifts the top of the guide rod 30, thereby causing the guide rod 30 to lift the baffle ball 31, so that the baffle ball 31 slides into the top of the inclined cavity 28, and then the baffle ball 31 no longer seals the flow channel 15, so that the flow channels 15 in the four male molds 12 are completely unblocked. In this process, no manual control is required, so that the control of cooling water during mold cooling does not require the participation of additional electrical components, and can be automatically adjusted according to the specific process of the mold working; After the multi-color plastic parts are injection molded, the bottom mold 1 and the concave mold 2 are reset by the injection molding machine, so that the reset spring 27 on the slider 11 limits the contact, and the reset spring 27 drives the slider 11 and the punch 12 to reset, so that the four punches 12 are dispersed and the combined mold 14 is exposed, so that the mold cavity is separated, and then the restrictions on the plastic parts are completely released, so that the plastic parts fall naturally, and the multi-color injection mold does not need to consider the discharge of the plastic parts, thereby reducing the difficulty of mold design. At the same time, there is no need for a piece arrangement device, which reduces electrical circuits and further reduces costs to complete the operation.

[0033] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A combined multi-color injection mold, characterized in that: The invention comprises a bottom mold (1), the top surface of the bottom mold (1) is fixedly connected to a concave mold (2), the top surface of the concave mold (2) is provided with a guide hole (3), and the top surface of the bottom mold (1) is fixedly connected to a fixed cylinder (4), a telescopic rod (5) is slidably sleeved in the fixed cylinder (4), one end of the telescopic rod (5) is fixedly connected to a first piston (6), the other end of the telescopic rod (5) is fixedly connected to a top mold (7), an injection hole (8) is formed through the top mold (7), and a first sealing cavity (9) is formed in the top mold (7), a sliding groove (10) is formed on the bottom surface of the top mold (7), a sliding block (11) is slidably sleeved in the sliding groove (10), a punch (12) is fixedly connected to the bottom surface of the sliding block (11), a guide column (13) is fixedly connected to the bottom surface of the punch (12), a flow channel (15) is formed in the punch (12), and a combined mold (14) is fixedly connected to the bottom surface of the top mold (7); A connecting tube (16) is fixedly sleeved in the top mold (7), one end of the connecting tube (16) is in communication with the first sealed cavity (9), the other end of the connecting tube (16) is in communication with the telescopic rod (5), the telescopic rod (5) is a hollow tubular structure, a second piston (17) is slidably sleeved in the first sealed cavity (9), one end of a first pull rope (18) is fixedly connected to the end surface of the second piston (17), the other end of the first pull rope (18) is in contact with and connected to the slider (11), and a first guide wheel (19) and a second guide wheel (20) are slidably sleeved on the outer surface of the first pull rope (18), and a return spring (27) is fixedly connected between the slider (11) and the end surface of the slide groove (10); The end of the first pull rope (18) is fixedly connected to one end of the second pull rope (21), the other end of the second pull rope (21) is wound with a roller (22), the bottom surface of the roller (22) is fixedly connected to one end of a transmission shaft (23), the other end of the transmission shaft (23) is fixedly connected to a gear (24), the outer surface of the gear (24) is meshingly connected to a rack (25), the end of the rack (25) is fixedly connected to a sealing ring (26), an oblique cavity (28) is provided at the end of the flow channel (15), a second sealing cavity (29) is provided in the punch (12), one end of a guide rod (30) is slidably sleeved in the second sealing cavity (29), and the other end of the guide rod (30) is fixedly connected to a blocking ball (31).

2. A combined multi-color injection mold according to claim 1, characterized in that: The fixed cylinder (4) and the telescopic rod (5) are both provided with two, and the two fixed cylinders (4) and the two telescopic rods (5) are symmetrically arranged with respect to the bisecting plane of the bottom mold (1), the first piston (6) is slidably sleeved with the fixed cylinder (4), the punches (12) are provided with four, and the four punches (12) are evenly spaced with respect to the central axis of the die (2), and the four punches (12), the combined mold (14) and the die (2) together form a cavity, and the injection holes (8) are provided with a plurality, and the plurality of injection holes (8) are all connected to the cavity.

3. The combined multi-color injection mold according to claim 1, characterized in that: The cross sections of the slide groove (10) and the slider (11) are both T-shaped, and the slide groove (10) and the slider (11) correspond to the punch (12) one by one. The guide column (13) is slidably sleeved with the guide hole (3). The first sealing cavity (9) is arranged parallel to the slide groove (10). The flow channel (15) corresponds to the punch (12) one by one, and the ports of the flow channel (15) are in contact with each other.

4. The combined multi-color injection mold according to claim 1, characterized in that: The connecting tube (16) is arranged in a Y shape, and there are two connecting tubes (16), and the two connecting tubes (16) are symmetrically arranged with respect to the bisecting plane of the top mold (7). The first pull rope (18) is distributed in a "F" shape, the first pull rope (18) is slidably sleeved with the top mold (7), and one end of the first pull rope (18) extends into the first sealing cavity (9), and the other end of the first pull rope (18) extends into the slide groove (10). A fixed sealing plug is arranged between the first pull rope (18) and the top mold (7). There are two first guide wheels (19), one first guide wheel (19) is rotatably connected to the inner surface of the first sealing cavity (9), and the other first guide wheel (19) is slidably sleeved with the top mold (7), and the second guide wheel (20) is rotatably connected to the side wall of the slide groove (10).

5. The combined multi-color injection mold according to claim 1, characterized in that: The second piston (17) pulls the slider (11) and the punch (12) to translate via the first pull rope (18), the first guide wheel (19) and the second guide wheel (20).

6. The combined multi-color injection mold according to claim 1, characterized in that: The rotating roller (22) is rotatably sleeved with the slider (11), the second pull rope (21) is slidably sleeved with the slider (11), a torsion spring is fixedly connected between the rotating roller (22) and the slider (11), the transmission shaft (23) and the gear (24) are both rotatably sleeved with the punch (12), and the rack (25) is slidably sleeved with the punch (12).

7. The combined multi-color injection mold according to claim 1, characterized in that: The sealing ring (26) is sleeved with the port of the flow channel (15), the sealing ring (26) is slidably sleeved with the side wall of the punch (12), the bottom end of the second sealing cavity (29) is connected to the exhaust duct of the punch (12), the blocking ball (31) is slidably sleeved with the inclined cavity (28), and the diameter of the blocking ball (31) is greater than the diameter of the flow channel (15).

8. The combined multi-color injection mold according to claim 1, characterized in that: The blocking ball (31) is engaged and sleeved with the flow channel (15), and the convex mold (12) pushes the guide rod (30) upward through compressed air.

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