Single-nozzle multi-head needle valve hot runner

Abstract

The utility model relates to the field of hot runners, in particular to a single-nozzle multi-head needle valve hot runner, which comprises a main nozzle and a needle valve driving component, a main runner and more than two sub-runners are arranged in the main nozzle, the more than two sub-runners are communicated with one end of the main runner, a nozzle core for ejecting plastics is arranged at one end of each sub-runner far away from the main runner, and the needle valve driving component is arranged in the nozzle core. A flange used for being in butt joint with an injection molding machine is arranged at the end, away from the branch runners, of the main runner, a temperature control assembly is arranged on the main nozzle, the needle valve driving assembly comprises an upper die plate, valve needles, a push plate and a driving air cylinder, the driving air cylinder is arranged in the upper die plate, and the number of the valve needles is consistent with that of the nozzle cores. The more than two valve needles are connected with the driving cylinder through the push plate, a plurality of hot nozzles and splitter plates do not need to be arranged, the overall size of the mold is reduced, the thickness of the mold is reduced, the driving cylinder drives the plurality of valve needles through the push plate, the arrangement space required between the sub-runners is greatly reduced, and the overall size of the mold is correspondingly and remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of hot runners, and in particular to hot runners for single-nozzle multi-head needle valves. Background Technology

[0002] Hot runner technology is a crucial technology in modern injection molding. It utilizes a constant-temperature heating system within the mold to keep the plastic in a molten state until it is injected into the product cavity. This technology not only improves injection molding efficiency but also ensures the consistency and quality of the molded products. In a hot runner system, plastic is precisely delivered to each injection point through the main runner and branch runners, achieving a highly efficient and precise injection process. Traditional hot runner systems typically employ a structure of one cylinder and one hot nozzle per cavity. Each injection point has an independent cylinder to drive the opening and closing of the valve needle, and a hot nozzle to maintain the molten plastic. An additional manifold is also required to distribute the plastic from the main runner to the various injection points.

[0003] The design of one cylinder and one hot runner per injection cavity increases the spacing between injection points in the mold. This is because each cylinder and hot runner requires space, which is often independent within the mold and cannot be effectively integrated. Therefore, as the number of injection points increases, the overall size of the mold also increases. This not only increases the difficulty and cost of mold processing but also makes the mold heavier and more inconvenient to transport, install, and use. The use of a manifold further increases the complexity and size of the mold. Furthermore, the increased mold size restricts the selection of injection molding machines, further increasing production costs. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a hot runner for a single-nozzle multi-head needle valve, which can effectively solve the technical problem of large overall size.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A single-nozzle multi-head needle valve hot runner includes a main nozzle and a needle valve drive assembly. The main nozzle has a main flow channel and two or more branch flow channels, each of which is connected to one end of the main flow channel. Each branch flow channel has a nozzle core for injecting plastic at the end away from the main flow channel. The main flow channel has a flange for docking with an injection molding machine at the end away from the branch flow channel. A temperature control assembly is installed on the main nozzle. The needle valve drive assembly includes an upper template, valve needles, a push plate, and a drive cylinder. The drive cylinder is located in the upper template. The number of valve needles is the same as the number of nozzle cores. Two or more valve needles are connected to the drive cylinder through the push plate. The end of the valve needle away from the push plate passes through the main nozzle and enters the branch flow channel, and the end of the valve needle away from the push plate also extends into the nozzle core. The drive cylinder can drive the push plate to move horizontally in the upper template. The push plate drives the valve needles away from or towards the nozzle core, thereby opening and closing the nozzle core.

[0007] Furthermore, the driving cylinder includes a piston and a cylinder body. The cylinder body is disposed in the upper template, and the piston is disposed in the cylinder body, dividing the cylinder body into two air chambers. One end of the piston extends out of the cylinder body and is connected to the push plate. When air enters one of the two air chambers, the piston can be pushed to move in the cylinder body under the action of air pressure, thereby driving the push plate and needle valve to move.

[0008] Furthermore, the surface of the upper template is provided with an air valve, and two air chambers are connected to the air valve through air passages. The upper template is provided with two or more drive cylinders, each drive cylinder is connected to an air valve, and each air valve can be controlled independently.

[0009] Furthermore, the main flow channel includes a main nozzle and a branch nozzle. The main flow channel is disposed in the main nozzle, and the branch flow channel and nozzle core are disposed in the branch nozzle. The main nozzle and the branch nozzle are connected by bolts.

[0010] Furthermore, both the main nozzle and the diverter nozzle are equipped with temperature control components.

[0011] Furthermore, the main channel is provided with a positioning hole, which is connected to the branch channel. The nozzle core is set in the positioning hole through a connector, which is connected to the positioning hole through a thread, so that the nozzle core is pressed into the positioning hole and connected to the branch channel.

[0012] Furthermore, a guide ring is provided in the positioning hole, and the guide ring is located between the nozzle core and the bottom surface of the positioning hole. The valve needle passes through the guide ring and is slidably connected to the guide ring.

[0013] Compared with existing technologies, the beneficial effects of this invention are as follows: By using a main nozzle for flow diversion, multiple hot nozzles and manifolds are eliminated, reducing the overall size and thickness of the mold, thus lowering mold costs. The drive cylinder, via a push plate, drives multiple valve needles to control the opening and closing of the nozzle core, significantly reducing the required spacing between the manifolds. Consequently, the overall size of the mold is also significantly reduced, further lowering the mold processing difficulty and manufacturing costs. It also makes the mold lighter, easier to operate and maintain. Since multi-cavity injection can be achieved with a single main nozzle, the number of hot nozzles is reduced, requiring only one temperature control unit, thus lowering operating costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0016] The following are the labels in the diagram: 1-Upper template, 2-Valve needle, 3-Push plate, 4-Piston, 5-Cylinder body, 6-Flange, 7-Main nozzle, 701-Main channel, 8-Diverter nozzle, 801-Diverter channel, 802-Positioning hole, 9-Nose core, 10-Connector, 11-Guide ring, 12-Temperature control component. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The following is combined with Figures 1-2 A detailed description of the hot runner of the single-nozzle multi-head needle valve of this utility model is provided below:

[0019] A single-nozzle multi-head needle valve hot runner system includes a main nozzle 7 and a needle valve drive assembly. The main nozzle 7 has a main flow channel 701 and multiple branch flow channels 801. Each branch flow channel 801 is connected to one end of the main flow channel 701. Each branch flow channel 801 has a nozzle core 9 for injecting plastic at its end away from the main flow channel 701. The end of the main flow channel 701 away from the branch flow channels 801 has a flange 6 for docking with an injection molding machine. A temperature control assembly 12 is installed on the main nozzle 7. The needle valve drive assembly includes an upper mold. The assembly consists of a plate 1, valve needles 2, a push plate 3, and a drive cylinder. The drive cylinder is located in the upper template 1. The number of valve needles 2 is the same as the number of nozzle cores 9. Multiple valve needles 2 are connected to the drive cylinder through the push plate 3. The end of the valve needle 2 away from the push plate 3 passes through the main nozzle 7 and enters the diversion channel 801. The end of the valve needle 2 away from the push plate 3 also extends into the nozzle core 9. The drive cylinder can drive the push plate 3 to move horizontally in the upper template 1. The push plate 3 drives the valve needles 2 away from or closer to the nozzle core 9, thereby enabling the nozzle core 9 to open and close.

[0020] By using a main nozzle 7 for flow distribution, multiple hot nozzles are eliminated, reducing the overall size and thickness of the mold and lowering mold costs. The drive cylinder, via the push plate 3, actuates multiple valve needles 2, controlling the opening and closing of the nozzle core 9, significantly reducing the required spacing between the flow channels 801. Consequently, the overall mold size is also significantly reduced, further lowering the mold's processing difficulty and manufacturing cost. This also makes the mold lighter, easier to operate, and easier to maintain. Since multi-cavity injection can be achieved with a single main nozzle 7, the number of hot nozzles is reduced, requiring only one temperature control assembly 12, thus lowering operating costs.

[0021] The driving cylinder includes a piston 4 and a cylinder body 5. The cylinder body 5 is disposed in the upper template 1, and the piston 4 is disposed in the cylinder body 5, dividing the cylinder body 5 into two air chambers. One end of the piston 4 extends out of the cylinder body 5 and is connected to the push plate 3. When air enters one of the two air chambers, it can push the piston 4 to move in the cylinder body 5 under the action of air pressure, thereby driving the push plate 3 and the needle valve to move. The surface of the upper template 1 is provided with an air valve. The two air chambers are connected to the air valve through air passages. Multiple driving cylinders are disposed in the upper template 1, and each driving cylinder is individually connected to an air valve. Each air valve can be independently controlled, and the number of driving cylinders can be increased according to the required thrust.

[0022] The main flow channel 701 includes a main nozzle 7 and a branch nozzle 8. The main flow channel 701 is disposed in the main nozzle 7, and the branch flow channel 801 and the nozzle core are disposed in the branch nozzle 8. The main nozzle 7 and the branch nozzle 8 are connected by bolts, which simplifies the structure of the hot runner system, facilitates disassembly and replacement of components, and reduces maintenance difficulty and cost.

[0023] The main flow channel 701 is provided with a positioning hole 802, which mates with the branch flow channel 801. The nozzle core 9 is set in the positioning hole 802 through a connector 10. The connector 10 is connected to the positioning hole 802 by threads, so that the nozzle core 9 is pressed into the positioning hole 802 and mates with the branch flow channel 801. This achieves a stable installation and precise positioning of the nozzle core 9, preventing loosening and falling off during the injection molding process, and ensuring the safety and reliability of the injection molding process. A guide ring 11 is provided in the positioning hole 802. The guide ring 11 is set between the nozzle core 9 and the bottom surface of the positioning hole 802. The valve needle 2 passes through the guide ring 11 and slides in connection with the guide ring 11. The guide ring 11 ensures that the valve needle 2 will not be misaligned.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A single-nozzle multi-head needle valve hot runner, comprising a main nozzle and a needle valve drive assembly, characterized in that: The main nozzle is provided with a main channel and two or more branch channels. The two or more branch channels are all connected to one end of the main channel. Each branch channel is provided with a nozzle core for injecting plastic at the end away from the main channel. The main channel is provided with a flange for docking with the injection molding machine at the end away from the branch channel. The main nozzle is provided with a temperature control component. The needle valve drive component includes an upper template, a valve needle, a push plate and a drive cylinder. The drive cylinder is located in the upper template. The number of valve needles is the same as the number of nozzle cores. Two or more valve needles are connected to the drive cylinder through the push plate. The end of the valve needle away from the push plate passes through the main nozzle and enters the branch channel. The end of the valve needle away from the push plate also extends into the nozzle core. The drive cylinder can drive the push plate to move horizontally in the upper template. The push plate drives the valve needle away from or towards the nozzle core, thereby opening and closing the nozzle core. The driving cylinder includes a piston and a cylinder body. The cylinder body is set in the upper template, and the piston is set in the cylinder body, dividing the cylinder body into two air chambers. One end of the piston extends out of the cylinder body and is connected to the push plate. When air enters one of the two air chambers, it can push the piston to move in the cylinder body under the action of air pressure, thereby driving the push plate and needle valve to move. The surface of the upper template is provided with an air valve. The two air chambers are connected to the air valve through an air passage. There are two or more driving cylinders in the upper template. Each driving cylinder is connected to an air valve, and each air valve can be controlled independently.

2. The hot runner of the single-nozzle multi-head needle valve according to claim 1, characterized in that: The main flow channel includes a main nozzle and a branch nozzle. The main flow channel is located in the main nozzle, and the branch flow channel and nozzle core are located in the branch nozzle. The main nozzle and the branch nozzle are connected by bolts.

3. The hot runner of the single-nozzle multi-head needle valve according to claim 2, characterized in that: Both the main nozzle and the diverter nozzle are equipped with temperature control components.

4. The hot runner of the single-nozzle multi-head needle valve according to any one of claims 1-3, characterized in that: The main channel is provided with a positioning hole, which is connected to the branch channel. The nozzle core is set in the positioning hole through a connector. The connector is connected to the positioning hole through a thread, so that the nozzle core is pressed into the positioning hole and connected to the branch channel.

5. The hot runner of the single-nozzle multi-head needle valve according to claim 4, characterized in that: A guide ring is provided in the positioning hole. The guide ring is located between the nozzle core and the bottom surface of the positioning hole. The valve needle passes through the guide ring and is slidably connected to the guide ring.

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