A precision injection molding die

Abstract

This invention discloses a precision injection molding mold, belonging to the technical field of injection molding molds. The invention includes a lower mold base, a lower mold fixed to the upper end of the lower mold base, and an upper mold mounted above the lower mold. The upper mold has an injection port, and the lower mold has an injection core embedded in it. A positioning vertical rod is fixed between the lower mold and the lower mold base, and a movable base plate is mounted on the positioning vertical rod. The lower center of the movable base plate is mounted on the telescopic end of a cylinder. A connecting frame is provided on the side of the movable base plate, and the middle of the side of the connecting frame is mounted on the telescopic end of another cylinder. The connecting frame has a first carrier plate and a second carrier plate. This precision injection molding mold, by providing a movable connecting frame between the lower mold and the lower mold base, and simultaneously mounting multiple sets of movable and switchable lifting modules on the connecting frame, allows for the adaptation to the lifting and demolding of mold cores of different shapes by switching between different lifting modules.

Description

Technical Field

[0001] This invention relates to the field of injection molding mold technology, specifically to a precision injection molding mold. Background Technology

[0002] Injection molding is a method of making various shapes of plastic products from thermoplastic or thermosetting plastics using molds. It has the advantages of low processing cost, high production efficiency and the ability to mold complex shapes. It has become one of the most important and commonly used methods in the manufacture of polymer products. During injection molding, some excess waste is generated. In order to avoid waste, the waste generated is usually recycled and reused in the subsequent molding of plastic parts.

[0003] For example, in the case of an ejection and demolding device for an injection molding die, as disclosed in CN221339422U, a base plate is provided. Two sets of first fixing rings are symmetrically arranged on the upper outer surfaces of both sides of the base plate. Each set of first fixing rings has a set of first support rods on its upper outer surface. The base plate and the first support rods are connected by the first fixing rings. Each set of first support rods has a set of first connecting blocks on its upper outer surface. The upper outer surfaces of the four sets of first connecting blocks are provided with a set of injection molds. A support block is provided on the upper outer surface of the center of the base plate. A fixing block is provided on the upper outer surface of the support block. Two sets of spring rods are provided on the upper inner wall of the fixing block. The existing technology has the following technical problems: When demolding, the existing injection molding mold pushes the molded part outward by moving the ejector block upward. However, the ejector block, as a lifting mechanism, can only be adapted to one type of injection mold. In order to achieve "one mold for multiple uses", the mold core in the injection mold in some factory workshops will be replaced to process injection molded parts of different shapes. However, the lifting mechanism with a fixed shape at the top cannot be adapted to different mold cores. The most common method is to disassemble and replace the lifting mechanism and the mold core at the same time, which greatly reduces the working efficiency of injection molding production.

[0004] Therefore, we propose a precision injection molding die to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a precision injection molding mold to solve the problem mentioned in the background art that the lifting mechanism with a fixed shape at the top of the existing injection molding mold cannot be adapted to different mold cores during demolding.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision injection molding mold, comprising a lower mold base, a lower mold fixed to the upper end of the lower mold base, and an upper mold installed above the lower mold. The upper mold is provided with an injection port, and the lower mold is inlaid with an injection core. A positioning vertical rod is fixed between the lower mold and the lower mold base, and a movable base plate is installed on the positioning vertical rod. The lower middle part of the movable base plate is installed on the telescopic end of a cylinder. A connecting frame is provided on the side of the movable base plate, and the middle part of the side of the connecting frame is installed on the telescopic end of another cylinder. A first carrier plate and a second carrier plate are provided on the connecting frame, and the first carrier plate and the second carrier plate are respectively installed through two guide rods. The first carrier plate and the second carrier plate are connected to each other by an auxiliary spring and the connecting frame. The first carrier plate and the second carrier plate are respectively provided with a first ejector rod and a second ejector rod, which can be switched and adjusted according to the injection core inside the lower mold.

[0007] Preferably, both the lower ends of the first and second carrier plates are equipped with sliders, and the sliders at the lower ends of the first and second carrier plates can slide in the limiting grooves opened on the movable substrate, and the movable substrate can slide along the positioning vertical rod.

[0008] By adopting the above technical solution, the sliding of the bottom sliders of the first and second carrier plates in the limiting groove can push the first or second carrier plate to move upward synchronously when the movable substrate moves upward.

[0009] Preferably, both the first carrier plate and the second carrier plate are slidable on the guide rod, and multiple first push rods and second push rods are bolted to the first carrier plate and the second carrier plate respectively.

[0010] By adopting the above technical solution, the movement of the first or second carrier plate can adapt to injection mold cores of different shapes via the first and second ejector pins.

[0011] Preferably, the first and second push rods have the same structure, and both the first and second push rods include a fixed column. A floating rod is inserted into the middle of the upper end of the fixed column, and a lifting head is fixed to the upper end of the floating rod. The lower end of the floating rod is connected to the fixed column through a return spring.

[0012] By adopting the above technical solution, the movement of the floating rod at the bottom of the lifting head on the fixed column can play a buffering role when lifting and demolding the injection molded part.

[0013] Preferably, the lifting head end shapes on the first and second push rods are different, and the lifting head end surface on the first push rod is a plane, while the lifting head end surface on the second push rod is a curved surface.

[0014] By adopting the above technical solution, different shaped lifting heads can be used to adapt to injection mold cores of different shapes.

[0015] Preferably, the diameter of the lifting head is larger than the diameter of the floating rod, and both the lower circumferential end of the lifting head and the upper circumferential end of the fixed column are provided with arc-shaped chamfers.

[0016] By adopting the above technical solution, the circumferential arc-shaped chamfer of the lifting head and the end of the fixed column facilitates the squeezing and pushing of the limiting rod.

[0017] Preferably, the injection mold core has a blocking groove inside, and a limiting rod is inserted inside the blocking groove. The limiting rod is connected to the blocking groove through an adjusting spring. The blocking groove is connected to the conveying channel inside the injection mold core. The conveying channel is connected to the liquid inlet channel and the liquid outlet channel on the lower mold. Both the liquid inlet channel and the liquid outlet channel are equipped with control valves.

[0018] By adopting the above technical solution, the liquid inlet channel and the liquid outlet channel can be set up to facilitate the introduction of liquid into the conveying channel and the interior of the blocking tank, and can also facilitate the discharge of liquid from the blocking tank and the conveying channel.

[0019] Preferably, one end of the limiting rod located inside the blocking groove is circumferentially wrapped with a sealing ring, and the limiting rod is able to slide inside the blocking groove.

[0020] By adopting the above technical solution, the sealing performance can be improved when the rod moves inside the blocking groove through the sealing ring at the end of the limiting rod.

[0021] Preferably, the limiting rod is perpendicular to the first or second ejector rod inserted inside the injection mold core, and the end of the limiting rod facing the first or second ejector rod is set with an arc-shaped structure.

[0022] By adopting the above technical solution, the movement of the limiting rod can be used to conveniently limit and fix the first or second push rod.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the precision injection molding mold, by setting a movable connecting frame between the lower mold and the lower mold base, and installing multiple sets of movable and switchable lifting modules on the connecting frame, can adapt to the lifting and demolding of mold cores of different shapes by switching different lifting modules; 1. By setting a first carrier plate and a second carrier plate on the connecting frame, and installing a first ejector pin and a second ejector pin on the first carrier plate and the second carrier plate respectively, after the injection mold core inside the lower mold is replaced, the connecting frame can be moved by the cylinder, so that the ejector pin on the corresponding carrier plate can be moved to the top of the movable base plate, and the first carrier plate or the second carrier plate can be moved by the movable base plate, thereby quickly replacing the corresponding ejector pin according to the injection mold core of different shapes; 2. By setting a floating rod and a lifting head on the fixed column, when the injection molded part is lifted upward, the lifting head collapses under force, causing the floating rod to move inside the fixed column. The movement of the floating rod can utilize the return spring to play a lifting buffering role. Attached Figure Description

[0024] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a schematic diagram of the lower mold and upper mold structure of the present invention; Figure 3 This is a schematic diagram of the liquid inlet channel and liquid outlet channel of the present invention; Figure 4 This is a schematic diagram of the positioning vertical rod and movable base plate structure of the present invention; Figure 5 This is a schematic diagram of the structure after the first ejector pin of the present invention is inserted into the injection mold core; Figure 6 This is a schematic diagram of the connecting frame and guide rod structure of the present invention; Figure 7 This is a schematic diagram of the floating rod and lifting head structure of the present invention; Figure 8 This is a schematic diagram of the limiting rod and adjusting spring structure of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle.

[0025] In the diagram: 1. Lower mold base; 2. Lower mold; 3. Upper mold; 4. Injection port; 5. Injection mold core; 6. Positioning vertical rod; 7. Movable base plate; 8. Connecting frame; 9. First carrier plate; 10. Second carrier plate; 11. Guide rod; 12. Auxiliary spring; 13. Limiting groove; 14. First ejector rod; 15. Second ejector rod; 16. Fixed column; 17. Floating rod; 18. Lifting head; 19. Return spring; 20. Limiting rod; 21. Adjusting spring; 22. Conveying channel; 23. Liquid inlet channel; 24. Blocking groove; 25. Liquid drain channel. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: Please refer to Figures 1-9Existing injection molding molds eject the molded part by moving the ejector block upwards during demolding. However, the ejector block, as a lifting mechanism, can only be adapted to one type of injection mold. In some factory workshops, injection molds are used for "multi-purpose" applications, with the mold core being replaced to process injection molded parts of different shapes. The fixed-shape ejector mechanism cannot be adapted to different mold cores. The most common method is to disassemble and replace the ejector mechanism and mold core simultaneously, which greatly reduces the efficiency of injection molding production. To solve this technical problem, this embodiment discloses the following technical content: a precision injection molding mold, including a lower mold base 1, a lower mold 2 fixed to the upper end of the lower mold base 1, and an upper mold 3 installed above the lower mold 2. The upper mold 3 is provided with an injection port 4, and the lower mold 2 is inlaid with an injection mold core 5. A positioning vertical rod 6 is fixed between the lower mold 2 and the lower mold base 1, and a movable base plate 7 is installed on the positioning vertical rod 6. The lower middle part of the movable base plate 7 is installed on the telescopic end of a cylinder, and a connecting frame 8 is provided on the side of the movable base plate 7. The first carrier plate 9 and the second carrier plate 10 are mounted on the telescopic end of another cylinder. The first carrier plate 9 and the second carrier plate 10 are respectively mounted through two guide rods 11. The first carrier plate 9 and the second carrier plate 10 are connected to the connecting frame 8 by auxiliary springs 12. The first carrier plate 9 and the second carrier plate 10 are respectively equipped with a first ejector rod 14 and a second ejector rod 15, which can be switched and adjusted according to the injection mold core 5 inside the lower mold 2. The lower ends of the first carrier plate 9 and the second carrier plate 10 are both equipped with sliders. The slider at the lower end of the carrier plate 10 can slide in the limiting groove 13 opened on the movable base plate 7. The movable base plate 7 can slide along the positioning vertical rod 6. The first carrier plate 9 and the second carrier plate 10 can both slide on the guide rod 11. A plurality of first push rods 14 and second push rods 15 are bolted to the first carrier plate 9 and the second carrier plate 10 respectively. The lifting head 18 on the first push rod 14 and the second push rod 15 have different end shapes. The end surface of the lifting head 18 on the first push rod 14 is flat, while the end surface of the lifting head 18 on the second push rod 15 is curved.

[0028] During injection molding, the corresponding injection mold core 5 is first installed inside the lower mold 2 as needed. At this time, the connecting frame 8 is moved by opening the cylinder. After the connecting frame 8 moves, it can drive the first carrier plate 9 and the second carrier plate 10 to move synchronously. The positions of the first carrier plate 9 and the second carrier plate 10 are adjusted according to the shape of the injection mold core 5. When the injection mold core 5 is flat, the second carrier plate 10 is moved above the movable base plate 7, and the first carrier plate 9 is offset from the movable base plate 7. When the injection mold core 5 is curved, the first carrier plate 9 is moved above the movable base plate 7, and the second carrier plate 10 is offset from the movable base plate 7. Since the lifting operation method is the same regardless of whether it is a curved surface or a flat surface, the following explanation will use injection mold core 5 as a flat surface as an example: When the second carrier plate 10 moves above the movable base plate 7, the movable base plate 7 is pushed upward by the cylinder. After the movable base plate 7 moves upward along the positioning vertical rod 6, the movement of the movable base plate 7 can push the second carrier plate 10 to move upward synchronously. At this time, the second carrier plate 10 moves upward along the guide rod 11. After the second carrier plate 10 moves upward, the first ejector rod 14 on it is inserted into the lower mold 2 and the injection mold core 5 until the upper surface of the end of the first ejector rod 14 and the surface of the injection mold core 5 are flush with each other. Then, the molten plastic is injected into the cavity through the injection port 4. After cooling and shaping, the movable base plate 7 is pushed upward by the cylinder. The first ejector rod 14 on the second carrier plate 10 can be used to lift and demold the molded injection part. By utilizing the movement and switching of the first carrier plate 9 and the second carrier plate 10, the switching efficiency of the lifting mechanism can be improved, avoiding the need for disassembly for replacement. This method is suitable for lifting and demolding in the "one mold for multiple uses" scenario, thereby improving the processing efficiency of injection molded parts in the factory workshop.

[0029] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. To reduce damage to the injection-molded part from the upper end of the ejector pin during demolding, such as... Figures 3-9 As shown, the following technical contents are disclosed in this embodiment: the first ejector rod 14 and the second ejector rod 15 have the same structure, and both the first ejector rod 14 and the second ejector rod 15 include a fixed post 16. A floating rod 17 is inserted into the middle of the upper end of the fixed post 16, and a lifting head 18 is fixed to the upper end of the floating rod 17. The lower end of the floating rod 17 is connected to the fixed post 16 through a return spring 19. The diameter of the lifting head 18 is larger than the diameter of the floating rod 17, and both the lower circumferential end of the lifting head 18 and the upper circumferential end of the fixed post 16 are provided with arc-shaped chamfers. A blocking groove 24 is opened inside the injection mold core 5, and a limiting rod 20 is inserted inside the blocking groove 24. 20 is connected to the adjusting spring 21 and the blocking groove 24, and the blocking groove 24 is connected to the conveying channel 22 inside the injection mold core 5. The conveying channel 22 is connected to the liquid inlet channel 23 and the liquid outlet channel 25 on the lower mold 2, and control valves are installed on the liquid inlet channel 23 and the liquid outlet channel 25. One end of the limiting rod 20 located inside the blocking groove 24 is circumferentially wrapped with a sealing ring, and the limiting rod 20 can slide inside the blocking groove 24. The limiting rod 20 is perpendicular to the first ejector rod 14 or the second ejector rod 15 inserted inside the injection mold core 5. The end of the limiting rod 20 facing the first ejector rod 14 or the second ejector rod 15 is set with an arc structure.

[0030] Since the first push rod 14 and the second push rod 15 have the same structure, the following description will use the first push rod 14 as an example. When the first ejector rod 14 moves upward to lift and demold the injection molded part, after the first ejector rod 14 moves upward, the lifting head 18 above the fixed column 16 comes into contact with the injection molded part. At this time, the lifting head 18 collapses after being subjected to force, allowing the floating rod 17 to move inside the fixed column 16. The elastic deformation of the return spring 19 after the floating rod 17 moves can play a buffering role, avoiding excessive lifting force from damaging the injection molded part. Because the first push rod 14 is designed as a collapsible elastic structure, when the first push rod 14 moves upward, the lifting head 18 contacts the arc-shaped end of the limiting rod 20. The lifting head 18 can then push the limiting rod 20, causing it to move away from the first push rod 14 until the lifting head 18 completely exceeds the limiting rod 20. The limiting rod 20 then resets under the action of the adjusting spring 21, and the reset limiting rod 20 is located below the lifting head 18. Next, the control valve on the drain channel 25 is closed, and liquid is injected into the delivery channel 22 through the inlet channel 23. At this time, the liquid enters the delivery channel. The interior of 22 and the blocking groove 24 utilizes the near incompressibility of the liquid to ensure that the limiting rod 20 cannot move during injection molding. Since the limiting rod 20 cannot move, the lifting head 18 cannot move downward and collapse. This prevents the lifting head 18 from moving downward due to excessive injection pressure in the cavity during injection molding, which would affect the molding quality of the injection molded part. When lifting and demolding are required, the liquid inside the blocking groove 24 and the conveying channel 22 is discharged outward through the drain channel 25, allowing the limiting rod 20 to move normally under pressure. Furthermore, in this application, when switching between the first ejector pin 14 and the second ejector pin 15, the first ejector pin 14 or the second ejector pin 15 needs to be detached from the injection mold core 5 and the lower mold 2. Therefore, in this case, it is also easy to replace the first ejector pin 14 or the second ejector pin 15 when fatigue damage occurs in the collapsing part, so as to prevent the lifting head 18 on the first ejector pin 14 from having a height difference with the plane of the injection mold core 5, thereby affecting the final injection molding quality.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision injection molding die, comprising a lower mold base (1), a lower mold (2) fixed to the upper end of the lower mold base (1), and an upper mold (3) mounted above the lower mold (2), wherein the upper mold (3) is provided with an injection port (4), and the lower mold (2) is inlaid with an injection mold core (5), characterized in that: A positioning rod (6) is fixed between the lower mold (2) and the lower mold base (1), and a movable base plate (7) is installed on the positioning rod (6). The lower middle part of the movable base plate (7) is installed on the telescopic end of the cylinder. A connecting frame (8) is provided on the side of the movable base plate (7), and the middle part of the side of the connecting frame (8) is installed on the telescopic end of another cylinder. A first carrier plate (9) and a second carrier plate (10) are provided on the connecting frame (8), and the first carrier plate (9) and the second carrier plate (10) are respectively installed through two guide rods (11). The first carrier plate (9) and the second carrier plate (10) are connected to each other by an auxiliary spring (12) and the connecting frame (8). The first carrier plate (9) and the second carrier plate (10) are respectively provided with a first ejector rod (14) and a second ejector rod (15), which can be switched and adjusted according to the injection mold core (5) inside the lower mold (2).

2. The precision injection molding die according to claim 1, characterized in that: The lower ends of the first carrier plate (9) and the second carrier plate (10) are both equipped with sliders, and the sliders at the lower ends of the first carrier plate (9) and the second carrier plate (10) can slide in the limiting groove (13) opened on the movable substrate (7), and the movable substrate (7) can slide along the positioning rod (6).

3. The precision injection molding die according to claim 1, characterized in that: Both the first carrier plate (9) and the second carrier plate (10) can slide on the guide rod (11), and multiple first push rods (14) and second push rods (15) are bolted to the first carrier plate (9) and the second carrier plate (10) respectively.

4. A precision injection molding die according to claim 3, characterized in that: The first push rod (14) and the second push rod (15) have the same structure, and both the first push rod (14) and the second push rod (15) include a fixed column (16). A floating rod (17) is inserted into the middle of the upper end of the fixed column (16), and a lifting head (18) is fixed to the upper end of the floating rod (17). The lower end of the floating rod (17) is connected to the fixed column (16) through a return spring (19).

5. A precision injection molding die according to claim 4, characterized in that: The lifting head (18) ends on the first push rod (14) and the second push rod (15) have different shapes, and the end surface of the lifting head (18) on the first push rod (14) is flat, while the end surface of the lifting head (18) on the second push rod (15) is curved.

6. A precision injection molding die according to claim 5, characterized in that: The diameter of the lifting head (18) is larger than the diameter of the floating rod (17), and the lower circumferential end of the lifting head (18) and the upper circumferential end of the fixed column (16) are both provided with arc-shaped chamfers.

7. A precision injection molding die according to claim 6, characterized in that: The injection mold core (5) has a blocking groove (24) inside, and a limiting rod (20) is inserted inside the blocking groove (24). The limiting rod (20) is connected to the blocking groove (24) through an adjusting spring (21). The blocking groove (24) is connected to the conveying channel (22) inside the injection mold core (5). The conveying channel (22) is connected to the liquid inlet channel (23) and the liquid outlet channel (25) on the lower mold (2). Control valves are installed on both the liquid inlet channel (23) and the liquid outlet channel (25).

8. A precision injection molding die according to claim 7, characterized in that: The limiting rod (20) is circumferentially wrapped with a sealing ring at one end inside the blocking groove (24), and the limiting rod (20) can slide inside the blocking groove (24).

9. A precision injection molding die according to claim 8, characterized in that: The limiting rod (20) is perpendicular to the first ejector rod (14) or the second ejector rod (15) inserted inside the injection mold core (5), and the end of the limiting rod (20) facing the first ejector rod (14) or the second ejector rod (15) is set with an arc structure.

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