A high-pressure syringe barrel injection molding setting device

Abstract

This utility model discloses a high-pressure injector syringe injection molding and shaping device, including a front mold, a middle mold, and a rear mold. The front mold has multiple cavities, with a connecting block at the front end of each cavity. The connecting block has multiple melt conduits extending towards the middle mold, and multiple melt nozzles are located on the outer ends of the melt conduits. The front mold has an injection hole at its front end. The front mold has multiple annularly distributed first mating grooves on the outer sides of the melt conduits, each containing a shell molding component with a molding cavity. The middle mold has multiple second mating grooves, each containing a sealing sleeve. The rear mold has multiple inner cavity molding components on the side facing the front mold. The front mold has an external cooling mechanism, and the rear mold has an internal cooling mechanism. This utility model injects molten adhesive from the melt conduits into the interiors of multiple molding components through multiple melt nozzles, improving injection molding efficiency and production efficiency.

Description

Technical Field

[0001] This utility model relates to an injection molding shaping device, specifically a high-pressure injector syringe injection molding shaping device, belonging to the field of injection molding production technology. Background Technology

[0002] High-pressure injectors are common medical devices, with the syringe being one of their most important components. High-pressure injectors require high levels of airtightness and smoothness in their syringes. Injection molding is commonly used to produce high-pressure injector syringes, which is convenient and ensures high quality. To address this, various injection molding devices have been developed. For example, Chinese utility model patent CN208497506U discloses a high-pressure injector syringe injection molding device, specifically comprising a base, an injection box, and a fixing plate. A pair of first supports are fixedly connected to the bottom of the base, and a support plate is horizontally fixed between the two first supports. A wastewater storage tank is located on the surface of the support plate. A movable plate is fixedly connected to the surface of the base, and a hydraulic cylinder is fixedly connected to one end of the movable plate. A hydraulic rod is fixedly connected to one side of the hydraulic cylinder. However, this device can only perform injection molding on a single syringe shell mold per injection tube, which somewhat affects injection molding efficiency and suggests room for improvement in production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure injector syringe injection molding and shaping device. This invention injects molten adhesive from a melt conduit into the interior of multiple molded parts through multiple melt nozzles, thereby improving injection molding efficiency and production efficiency.

[0004] The technical solution of this utility model is as follows: A high-pressure injector syringe injection molding and shaping device includes a front mold, a middle mold, and a rear mold; the front mold has multiple cavities, and the front end of each cavity has a connecting block. The connecting block has multiple melt conduits extending towards the middle mold, and the outer end of each melt conduit has multiple melt nozzles; the front end of the front mold has an injection hole that communicates with the interior of the melt conduits; the front mold has multiple annularly distributed first mating grooves on the outside of the melt conduits, each first mating groove containing a shell molding component, and the shell molding component containing a molding cavity; the melt nozzles pass through the first mating grooves and the shell molding component and communicate with the molding cavity; the middle mold has multiple second mating grooves corresponding to the first mating grooves; the second mating grooves contain sealing sleeves; the rear mold has multiple inner cavity molding components on the side facing the front mold, and these inner cavity molding components pass through the sealing sleeves and are inserted into the molding cavity; the front mold has an external cooling mechanism; the rear mold has an internal cooling mechanism.

[0005] The aforementioned high-pressure injector syringe injection molding and shaping device includes an external cooling mechanism comprising multiple first cooling interfaces disposed on both sides of the front mold and first cooling ports disposed on both sides of the first mating groove, wherein the first cooling ports are connected to the first cooling interfaces on the same side.

[0006] The aforementioned high-pressure injector syringe injection molding device includes an internal cooling mechanism comprising multiple second cooling interfaces disposed on both sides of the rear mold and a cooling channel disposed inside the inner cavity molded part, wherein the cooling channel is connected to the second cooling interfaces via a pipe.

[0007] In the aforementioned high-pressure injector syringe injection molding and shaping device, mounting blocks are symmetrically arranged at the bottom of the front mold, and a guide rail is fixedly connected below the mounting blocks; a first slider is symmetrically arranged at the bottom of the middle mold, and the first slider is slidably connected to the guide rail; a second slider is symmetrically arranged at the bottom of the rear mold, and the second slider is slidably connected to the guide rail.

[0008] The aforementioned high-pressure injector syringe injection molding device includes a plurality of guide rods on the side of the rear mold facing the front mold; a plurality of first sliding grooves on the middle mold, with a first sleeve inside the groove, the first sleeve being slidably connected to the guide rods; and a plurality of second sliding grooves on the front mold, with a second sleeve inside the groove, the second sleeve being slidably connected to the guide rods.

[0009] In the aforementioned high-pressure injector syringe injection molding and shaping device, the rear mold has symmetrically arranged first side plates on both sides, and electric push rods are provided on the first side plates; the middle mold has symmetrically arranged second side plates on both sides; and the other end of the electric push rod is connected to the second side plate.

[0010] In the aforementioned high-pressure injector syringe injection molding and shaping device, there is a gap between the middle part of the outer shell molding part and the first mating groove.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, before injection molding, the front mold, middle mold, and rear mold are closed. The inner cavity molded part of the rear mold passes through the sealing sleeve and is inserted into the molding cavity of the outer shell molded part, forming a closed injection space. During injection molding, molten plastic is injected into the melt conduit through the injection hole at the front end of the front mold. The molten plastic is transmitted through the conduit to multiple melt nozzles on its outer side. After passing through the first mating groove and the outer shell molded part, the nozzles evenly inject the molten plastic into the molding cavity. At this time, the sealing sleeve in the second mating groove of the middle mold tightly fits the mating point between the inner cavity molded part and the outer shell molded part, effectively ensuring the sealing between the molding cavity and the inner cavity molded part and preventing the molten plastic from overflowing from the gap. During the injection molding process, the external cooling mechanism in the front mold cools the outer shell molded part outside the first mating groove, while the internal cooling mechanism in the rear mold cools the inner cavity molded part inserted into the molding cavity. The synergistic cooling of the inside and outside accelerates the solidification of the molten plastic. After cooling, the rear mold drives the middle mold to move outward in the opposite direction of mold closing. At this time, the formed syringe is sleeved on the end of the inner cavity molded part and located outside the middle mold. Subsequently, the middle mold continues to move outward and separates from the rear mold. The moving force of the middle mold is used to smoothly remove the syringe from the inner cavity molded part, completing the entire injection molding process of the high-pressure injector syringe. This allows for simultaneous injection molding of multiple molding cavities, improving production efficiency.

[0012] 2. In this utility model, a first slider is provided at the bottom of the middle mold, and a second slider is provided at the bottom of the rear mold. The first and second sliders are respectively slidably engaged with the guide rail. Through the precise guidance of the sliders and the guide rail, the middle mold and the rear mold are ensured to run smoothly along a predetermined trajectory during movement, avoiding deviation. During mold closing and opening, the guide rods are respectively inserted into the first and second sleeves and slidably engaged with them. Through the precise clearance fit between the guide rods and the sleeves, the relative positions of the front mold, middle mold, and rear mold are precisely positioned, thereby ensuring the accuracy of alignment when the three are closed and ensuring the precise fit of the molded structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the front mold.

[0014] The labels in the attached diagram are as follows: 1-front mold, 2-middle mold, 3-rear mold, 4-cavity, 5-connecting block, 6-melt conduit, 7-melt nozzle, 8-injection hole, 9-first mating groove, 10-outer shell molding part, 11-molding cavity, 12-second mating groove, 13-sealing sleeve, 14-inner cavity molding part, 15-external cooling mechanism, 151-first cooling interface, 152-first cooling port, 16-internal cooling mechanism, 161-second cooling interface, 162-cooling channel, 17-mounting block, 18-guide rail, 19-first slider, 20-second slider, 21-guide rod, 22-first slide groove, 23-first sleeve, 24-second slide groove, 25-second sleeve, 26-first side plate, 27-electric push rod, 28-second side plate. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example: A high-pressure injector syringe syringe injection molding and shaping device, configured as follows Figure 1-3 As shown, the system includes a front mold 1, a middle mold 2, and a rear mold 3; all three are made of S136 alloy steel, a material with excellent corrosion resistance and polishing properties, meeting the high requirements of medical products for mold surface precision and hygiene. They provide the basic structure for the entire injection molding process, ensuring the overall rigidity and molding accuracy of the mold. The outer end of the rear mold is connected to an external driving device, such as a pneumatic cylinder or hydraulic cylinder. Figure 2As shown, the front mold 1 has multiple cavities 4, and the front end of each cavity 4 has a connecting block 5. The connecting block 5 is made of 45# steel, which has moderate strength and is easy to precision machine, fixing the melt conduit 6 and ensuring the stability of the melt conduit 6 during injection molding. Multiple melt conduits 6 extending towards the middle mold 2 are provided on the connecting block 5. The melt conduits 6 are made of H13 hot work die steel, which has good high temperature resistance and wear resistance, guiding the flow of melt and stably conveying the melt from the injection hole 8 to the melt nozzle 7. Their smooth internal channel structure reduces melt flow resistance and prevents melt from stagnating or decomposing during conveying. Multiple melt nozzles 7 are provided on the outer side of the melt conduit 6. The melt nozzles 7 are made of tungsten cobalt hard alloy, which has high hardness and strong wear resistance, and can withstand the high temperature and impact of the melt, accurately injecting the melt into the molding cavity 11 and ensuring that the melt is evenly distributed in each molding cavity 11. The front mold 1 has an injection hole 8 at its front end, which is integrally formed with the front mold 1 and connects to an external melt supply device, serving as the inlet for the melt to enter the device. A sealed connection with the external device prevents melt leakage during injection. The injection hole 8 is internally connected to the melt conduit 6, ensuring smooth entry of the melt into the conduit 6. The front mold 1 has multiple annularly distributed first mating grooves 9 on the outside of the melt conduit 6, integrally formed with the front mold 1. A shell molding component 10 is housed within the first mating grooves 9. The shell molding component 10 is made of P20 pre-hardened steel, facilitating machining and possessing sufficient hardness to ensure the dimensional stability of the molding cavity 11. The molding cavity 11 within the shell molding component 10 provides molding space for the melt and directly determines the shape accuracy of the syringe's exterior. A gap exists between the middle of the shell molding component 10 and the first mating grooves 9, ensuring sufficient heat exchange contact between the cooling water and the shell molding component 10 during flow, thus improving cooling efficiency. The melt nozzle 7 passes through the first mating groove 9 and the outer shell molding part 10 and is connected to the molding cavity 11, ensuring that the melt can be directly injected into the molding cavity 11. The intermediate mold 2 is provided with multiple second mating grooves 12, which are integrally formed with the intermediate mold 2. The second mating grooves 12 correspond to the first mating groove 9, ensuring that the sealing sleeve 13 accurately aligns with the mating point between the outer shell molding part 10 and the inner cavity molding part 14 when the mold is closed. The sealing sleeve 13 has a ring structure, allowing the inner cavity molding part 14 to pass through, and its outer side is fixedly connected to the second mating groove 12. The sealing sleeve 13 is provided inside the second mating groove 12. The sealing sleeve 13 is made of high-temperature resistant silicone rubber, which has good elasticity and temperature resistance, can withstand the high temperature of the melt without failure, and seals the mating gap between the inner cavity molding part 14 and the outer shell molding part 10, preventing the melt from overflowing from the gap during injection molding. The rear mold 3 is provided with a plurality of inner cavity forming parts 14 on the side facing the front mold 1. The inner cavity forming parts 14 are made of S136 alloy steel and the surface is precision polished to form a forming structure of the internal shape of the syringe. The inner cavity forming parts 14 pass through the sealing sleeve 13 and are inserted into the forming cavity 11, together with the forming cavity 11 of the outer shell forming part 10 to form the complete forming space of the syringe.The front mold 1 is equipped with an external cooling mechanism 15; the rear mold 3 is equipped with an internal cooling mechanism 16. When the front mold 1, the middle mold 2, and the rear mold 3 are closed, the inner cavity molding part 14 of the rear mold 3 passes through the sealing sleeve 13 and is inserted into the molding cavity 11 of the outer shell molding part 10, forming a closed injection space. During injection, molten glue is injected into the melt conduit 6 through the injection hole 8 at the front end of the front mold 1. The molten glue is transmitted through the melt conduit 6 to multiple melt nozzles 7 on its outer end side. After the nozzles pass through the first mating groove 9 and the outer shell molding part 10, the molten glue is evenly injected into the molding cavity 11. At this time, the sealing sleeve 13 in the second mating groove 12 of the middle mold 2 tightly fits the mating point between the inner cavity molding part 14 and the outer shell molding part 10, effectively ensuring the sealing between the molding cavity 11 and the inner cavity molding part 14 and preventing the molten glue from overflowing from the gap. During injection molding, the external cooling mechanism 15 inside the front mold 1 cools the outer shell molding part 10 outside the first mating groove 9, while the internal cooling mechanism 16 inside the rear mold 3 cools the inner cavity molding part 14 inserted into the molding cavity 11. This coordinated internal and external cooling accelerates the solidification of the molten plastic. After cooling, the rear mold 3 drives the middle mold 2 to move outward in the opposite direction of mold closing. At this time, the molded syringe is fitted onto the end of the inner cavity molding part 14 and located outside the middle mold 2. Subsequently, the middle mold 2 continues to move outward, separating from the rear mold 3. The moving force of the middle mold 2 is used to smoothly remove the syringe from the inner cavity molding part 14, completing the entire injection molding and solidification process of the high-pressure injector syringe. Figure 3 As shown, the external cooling mechanism 15 includes multiple first cooling interfaces 151 disposed on both sides of the front mold 1 and first cooling ports 152 disposed on both sides of the first mating groove 9. The first cooling interfaces 151 are made of brass, which has good corrosion resistance and thermal conductivity, and are connected to an external cooling water source to introduce cooling water into the external cooling mechanism 15. The first cooling ports 152 are connected to the first cooling interfaces 151 on the same side. The first cooling ports 152 are through holes opened in the side wall of the first mating groove 9, guiding cooling water into the gap between the outer shell molding part 10 and the first mating groove 9. Heat is removed through heat exchange between the cooling water and the outer shell molding part 10, accelerating the cooling of the outer shell molding part 10. Figure 1 and 2 As shown, the internal cooling mechanism 16 includes multiple second cooling ports 161 disposed on both sides of the rear mold 3 and a cooling channel 162 disposed inside the inner cavity molding part 14. The second cooling ports 161 are also made of brass and are connected to an external cooling water source to introduce cooling water into the internal cooling mechanism 16. The cooling channel 162 is a long, narrow channel formed inside the inner cavity molding part 14, guiding the cooling water to flow inside the inner cavity molding part 14. Through direct heat exchange between the cooling water and the inner cavity molding part 14, heat from the molten adhesive is carried away from the inside of the syringe, accelerating the cooling and solidification of the molten adhesive from the inside. The cooling channel 162 is connected to the second cooling ports 161 via pipes to ensure the circulation of cooling water. Figure 1As shown, mounting blocks 17 are symmetrically arranged at the bottom of the front mold 1. The mounting blocks 17 are made of 45# steel and are fixedly connected to the front mold 1 by bolts. A guide rail 18 is fixedly connected below the mounting blocks 17. The guide rail 18 is made of alloy tool steel and has high surface hardness and wear resistance after quenching treatment. It provides a sliding track for the sliders, restricting the movement direction of the middle mold 2 and the rear mold 3, ensuring their smooth movement along a preset trajectory. A first slider 19 is symmetrically arranged at the bottom of the middle mold 2, and a second slider 20 is symmetrically arranged at the bottom of the rear mold 3. Both the first slider 19 and the second slider 20 are made of bearing steel and have ground surfaces, possessing good wear resistance and a low coefficient of friction. They respectively drive the middle mold 2 and the rear mold 3 to slide along the guide rail 18, realizing the opening and closing movement of the middle mold 2 and the rear mold 3. The first slider 19 and the second slider 20 are slidably connected to the guide rail 18. Through the precise guidance of the sliders and the guide rail 18, the middle mold 2 and the rear mold 3 are ensured to run smoothly along the predetermined trajectory during movement, avoiding deviation. Figure 2 As shown, the rear mold 3 has multiple guide rods 21 facing the front mold 1. The guide rods 21 are made of alloy structural steel with a chrome-plated surface, providing excellent wear resistance and rust prevention. They provide positioning and guidance for the closing of the front mold 1, middle mold 2, and rear mold 3, ensuring precise relative positioning during mold closing. The middle mold 2 has multiple first sliding grooves 22, each containing a first sleeve 23. The first sleeve 23 is made of bronze, providing excellent wear resistance and self-lubricating properties. The first sleeve 23 is slidably connected to the guide rods 21, cooperating with them to guide the mold and reduce wear on the guide rods 21 during sliding, while ensuring the smooth movement of the middle mold 2 along the guide rods 21. The front mold 1 has multiple second sliding grooves 24, each containing a second sleeve 25. The second sleeve 25 is made of the same material as the first sleeve 23, and its function and purpose are the same as the first sleeve 23, used to guide the front mold 1 in conjunction with the guide rods 21. The second sleeve 25 is slidably connected to the guide rods 21. During mold closing and opening, guide rods 21 are inserted into the first sleeve 23 and the second sleeve 25 respectively and slide with them. The guide rods 21 and the sleeves have a clearance fit, with a precision grade of H7 / g6. They are lubricated with lubricating oil to precisely position the relative positions of the front mold 1, the middle mold 2, and the rear mold 3, thereby ensuring accurate alignment during mold closing and ensuring precise fit of the molded structure. Figure 1As shown, the rear mold 3 has symmetrically arranged first side plates 26 on both sides. The first side plates 26 are made of 45# steel and are welded or bolted to the rear mold 3. An electric actuator 27 is provided on the first side plate 26. The electric actuator 27 is an electrically driven linear actuator that provides driving force to separate the middle mold 2 from the rear mold 3. The middle mold 2 has symmetrically arranged second side plates 28 on both sides. The other end of the electric actuator 27 is connected to the second side plate 28. The second side plate 28 is made of the same material as the first side plate 26 and connects to the electric actuator 27, transmitting the thrust of the electric actuator 27 to the middle mold 2. When the middle mold 2 separates from the rear mold 3, the two are separated by the extension and retraction movement of the electric actuator 27.

[0017] Working principle: The mold is closed to form a closed space: the front mold 1, the middle mold 2 and the rear mold 3 are closed. The inner cavity molding part 14 of the rear mold 3 passes through the sealing sleeve 13 in the second mating groove 12 of the middle mold 2 and is inserted into the molding cavity 11 of the outer shell molding part 10 in the first mating groove 9 of the front mold 1, forming a closed injection space.

[0018] Injection filling: Molten glue is injected into the melt conduit 6 through the injection hole 8 at the front end of the front mold 1. The molten glue is then transported through the melt conduit 6 to multiple melt nozzles 7 on its outer side. After passing through the first mating groove 9 and the outer shell molding part 10, the nozzles evenly inject the molten glue into the molding cavity 11. During this process, the sealing sleeve 13 of the middle mold 2 tightly fits the mating point between the inner cavity molding part 14 and the outer shell molding part 10 to ensure sealing and prevent molten glue from overflowing.

[0019] Synergistic cooling and shaping: During the injection molding process, the external cooling mechanism 15 in the front mold 1 introduces cooling water through the first cooling port 151 on one side, and flows to the outer shell molded part 10 through the first cooling port 152 to cool the outer shell molded part 10. The cooling water flows out from the first cooling port 151 on the other side. The internal cooling mechanism 16 in the rear mold 3 introduces cooling water through the second cooling port 161 on one side, and flows inside the inner cavity molded part 14 through the cooling channel 162. After cooling the inner cavity molded part 14, it flows out from the second cooling port 161 on the other side. The internal and external cooling mechanisms work together to accelerate the shaping of the melt.

[0020] Mold opening and part removal: After cooling, the external drive mechanism causes the rear mold 3 and the middle mold 2 to move outward in the opposite direction of mold closing. At this time, the formed syringe is sleeved on the end of the inner cavity molded part 14 and located outside the middle mold 2. Then, the middle mold 2 continues to move outward under the action of the electric push rod 27 and separates from the rear mold 3. The syringe on the inner cavity molded part 14 is successfully removed by the moving force of the middle mold 2, completing the entire injection molding process.

Claims

1. A high-pressure injector syringe barrel injection molding and shaping device, characterized in that: The system includes a front mold (1), a middle mold (2), and a rear mold (3). The front mold (1) has multiple cavities (4), and the front end of each cavity (4) has a connecting block (5). The connecting block (5) has multiple melt conduits (6) extending toward the middle mold (2), and the outer end of each melt conduit (6) has multiple melt nozzles (7). The front end of the front mold (1) has an injection hole (8), which is connected to the inside of the melt conduit (6). The front mold (1) has multiple first mating grooves (9) arranged in a ring on the outside of the melt conduit (6). The first mating grooves (9) have shell molding parts (10) inside them. The shell molding parts (10) have multiple first mating grooves (9) arranged in a ring on the outside of the melt conduit (6). There is a molding cavity (11); the melt nozzle (7) passes through the first mating groove (9) and the outer shell molding part (10) and is connected to the molding cavity (11); the middle mold (2) is provided with a plurality of second mating grooves (12), the second mating grooves (12) are corresponding to the first mating grooves (9); the second mating grooves (12) are provided with a sealing sleeve (13); the rear mold (3) is provided with a plurality of inner cavity molding parts (14) on the side facing the front mold (1), the inner cavity molding parts (14) pass through the sealing sleeves (13) and are inserted into the molding cavity (11); the front mold (1) is provided with an external cooling mechanism (15); the rear mold (3) is provided with an internal cooling mechanism (16).

2. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: The external cooling mechanism (15) includes multiple first cooling interfaces (151) on both sides of the front mold (1) and first cooling ports (152) on both sides of the first mating groove (9). The first cooling ports (152) are connected to the first cooling interfaces (151) on the same side.

3. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: The internal cooling mechanism (16) includes multiple second cooling ports (161) on both sides of the rear mold (3) and a cooling channel (162) inside the inner cavity molding part (14). The cooling channel (162) is connected to the second cooling ports (161) via a pipe.

4. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: The front mold (1) has symmetrical mounting blocks (17) at its bottom, and a guide rail (18) is fixedly connected below the mounting blocks (17); the middle mold (2) has symmetrical first sliders (19) at its bottom, and the first sliders (19) are slidably connected to the guide rails (18); the rear mold (3) has symmetrical second sliders (20) at its bottom, and the second sliders (20) are slidably connected to the guide rails (18).

5. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: The rear mold (3) is provided with multiple guide rods (21) on the side facing the front mold (1); the middle mold (2) is provided with multiple first sliding grooves (22), and a first sleeve (23) is provided in the sliding groove, and the first sleeve (23) is slidably connected to the guide rods (21); the front mold (1) is provided with multiple second sliding grooves (24), and a second sleeve (25) is provided in the sliding groove, and the second sleeve (25) is slidably connected to the guide rods (21).

6. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: The rear mold (3) is symmetrically provided with first side plates (26) on both sides, and electric push rods (27) are provided on the first side plates (26); the middle mold (2) is symmetrically provided with second side plates (28) on both sides; the other end of the electric push rod (27) is connected to the second side plate (28).

7. The high-pressure injector syringe injection molding and shaping device according to claim 1, characterized in that: There is a gap between the middle of the outer shell molding (10) and the first mating groove (9).

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