Split valve needle independently controls flow hot nozzle

Abstract

This utility model discloses a split-type valve needle independent flow control hot runner, relating to the field of injection mold hot runner technology. It includes a flange with a split mechanism inside for independent valve needle control. The split mechanism includes: a valve needle unit, located inside the flange, comprising a hot runner body with a flow channel and a valve needle channel inside. The right end outlet of the flow channel is coaxial with the valve needle channel, and a valve needle is slidably mounted inside the valve needle channel. The valve needle's independence is achieved by separating the flow channel from the valve needle; and an injection port unit, located to the right of the valve needle unit, used for opening and closing with the valve needle. The flow channel and valve needle channel are designed as independent coaxial structures, with the valve needle sliding only within the valve needle channel, completely detached from contact with the melt within the flow channel. The valve needle independently completes its opening and closing action inside the gate, thereby eliminating mechanical damage to the reinforcing fibers and significantly improving the quality of the plastic part.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology for injection molds, specifically a split-type valve needle independent flow control hot nozzle. Background Technology

[0002] The main function of hot runner nozzles is to keep the plastic in a molten state at the runner and gate to ensure that the plastic can flow smoothly and fill the mold cavity, thereby producing high-quality plastic parts.

[0003] According to the patent titled "A Hot Runner Multi-Head Needle Valve Nozzle" (patent publication number: CN223030265U, patent publication date: 2025-06-27), it includes a multi-head needle valve nozzle body and multiple movable valve cores. The top of the multi-head needle valve nozzle body is provided with a support platform and a fixed platform. The fixed platform is located above the support platform. Multiple drive rods are slidably connected to the support platform. The bottom of the drive rods is fixedly connected to a drive shaft. The bottom of the drive shaft is fixedly connected to the valve core for driving the valve core to move. The top of the drive rod is fixedly connected to a magnetic ring. The top of the support platform is provided with a lifting ring that can move up and down. By setting a motor and a micro electric telescopic rod, the lifting ring can be driven up and down by the motor, and the lifting ring drives all the valve cores to move synchronously. Alternatively, the micro electric telescopic rod can be controlled independently by using an electromagnet to attract the magnetic ring, so that the movement of each valve core can be controlled independently.

[0004] Based on the aforementioned existing technology, the current valve needle independent flow control hot nozzle still has the following problems: the existing traditional valve needle usually penetrates the flow channel, and the surface of the valve needle rubs against the melt when it moves. The scraping of the valve needle can cause the glass fiber or carbon fiber to break. Therefore, this utility model provides a split valve needle independent flow control hot nozzle. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an independent flow control hot nozzle for valve needles, which solves the following problems that still exist in existing split-type independent flow control hot nozzles for valve needles: the existing traditional valve needles usually penetrate the flow channel, and the surface of the valve needle rubs against the melt when it moves, and the scraping of the valve needle can cause the glass fiber or carbon fiber to break.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a split-type valve needle independent flow control hot nozzle, including a flange, wherein the flange has a split mechanism inside for achieving valve needle independence, the split mechanism including:

[0007] The valve needle unit is located inside the flange and includes a hot nozzle body. The hot nozzle body has a flow channel and a valve needle channel inside. The right end outlet of the flow channel is coaxial with the valve needle channel. A valve needle is slidably installed inside the valve needle channel. The valve needle is independent by separating the flow channel from the valve needle.

[0008] The injection port unit is located on the right side of the valve needle unit and is used to achieve opening and closing with the valve needle.

[0009] Preferably, a valve needle sleeve is fixedly installed inside the valve needle channel, and a limiting tube is rotatably installed inside the valve needle channel with threads. One end of the limiting tube is inserted into the inside of the valve needle sleeve, and the valve needle slides between the limiting tube and the valve needle sleeve to limit the movement of the valve needle.

[0010] Preferably, a rubber gasket is fixedly installed between the limiting tube and the valve needle sleeve to seal the connection between the limiting tube and the valve needle sleeve.

[0011] Preferably, a plurality of embedded heating wires are fixedly installed inside the hot nozzle body through grooves, thereby heating the hot nozzle body and heating the melt flowing inside the flow channel.

[0012] Preferably, the outer contour of the hot nozzle body adopts an elliptical or shoulder-shaped cross-section, and its major axis is perpendicular to the arrangement direction of adjacent hot nozzles.

[0013] Preferably, the injection nozzle unit includes a sprue screw threadedly mounted on the right end of the hot nozzle body, and a heat insulation cap is fixedly mounted on the right end of the sprue screw.

[0014] This invention provides a split-type valve needle with independent flow control. Compared with the prior art, it has the following advantages:

[0015] Beneficial effects:

[0016] 1. This split-type valve needle independent flow control nozzle features an independent coaxial structure between the flow channel and the valve needle channel. The valve needle slides only within the valve needle channel, completely detached from the melt contact within the flow channel. The valve needle independently completes its opening and closing action inside the gating system, thereby eliminating mechanical damage to the reinforcing fibers and significantly improving the quality of the plastic parts.

[0017] 2. This split-type valve needle independently controls the flow of the hot nozzle. The outer contour of the hot nozzle body adopts an elliptical or shoulder-shaped cross-section, and its long axis is perpendicular to adjacent hot nozzles, significantly reducing the spacing of multiple hot nozzles installed in parallel and improving the utilization of mold space. At the same time, the hot nozzle body is directly heated by the embedded heating wire in the groove, reducing heat conduction loss, ensuring uniform and stable melt temperature in the flow channel, avoiding cold material blockage, and improving the reliability of injection molding. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 3This is a three-dimensional structural diagram of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0022] In the diagram: 1-Flange, 2-Separate mechanism, 21-Valve needle unit, 211-Hot nozzle body, 212-Flow channel, 213-Valve needle passage, 214-Valve needle, 215-Valve needle sleeve, 216-Rubber pad, 217-Limiting pipe, 218-Embedded heating wire, 22-Injection port unit, 221-Gating nozzle, 222-Insulation cap. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-4 This utility model provides a technical solution:

[0025] The split-type valve needle independent flow control hot nozzle includes a flange 1. The flange 1 has a split mechanism 2 inside to achieve valve needle independence. The split mechanism 2 includes:

[0026] The valve needle unit 21 is located inside the flange 1 and includes a hot nozzle body 211. The hot nozzle body 211 has a flow channel 212 and a valve needle channel 213 inside. The right end outlet of the flow channel 212 is coaxial with the valve needle channel 213. A valve needle 214 is slidably installed inside the valve needle channel 213. The valve needle is independent by separating the flow channel 212 from the valve needle 214.

[0027] The injection port unit 22 is located on the right side of the valve needle unit 21 and is used to open and close with the valve needle 214.

[0028] In this embodiment, a valve needle sleeve 215 is fixedly installed inside the valve needle channel 213, and a limiting tube 217 is rotatably installed inside the valve needle channel 213. One end of the limiting tube 217 is inserted into the valve needle sleeve 215, and the valve needle 214 slides inside the limiting tube 217 and the valve needle sleeve 215 to limit the movement of the valve needle 214.

[0029] The dual guidance of the valve needle sleeve 215 and the limiting tube 217 ensures that the valve needle 214 moves linearly without deviation, thus improving the stability of the opening and closing action.

[0030] In this embodiment, a rubber pad 216 is fixedly installed between the limiting tube 217 and the valve needle sleeve 215 to seal the connection between the limiting tube 217 and the valve needle sleeve 215.

[0031] The rubber pad 216 seals the connection gap between the limiting tube and the valve needle sleeve to prevent high-temperature melt from seeping into the valve needle channel 213, which could cause the needle to get stuck or become contaminated.

[0032] In this embodiment, a number of embedded heating wires 218 are fixedly installed inside the hot nozzle body 211 through grooves. The embedded heating wires 218 are used to heat the hot nozzle body 211 and heat the melt flowing inside the flow channel 212.

[0033] The heating wire 218 is embedded in the groove of the hot nozzle body, which shortens the distance between the heat source and the melt, resulting in fast heating and uniform temperature distribution.

[0034] In this embodiment, the outer contour of the hot nozzle body 211 adopts an elliptical or shoulder-shaped cross section, and its major axis direction is perpendicular to the arrangement direction of adjacent hot nozzles.

[0035] The outer contour of the hot nozzle body 211 is elliptical or shoulder-shaped, with the major axis perpendicular to the direction of adjacent hot nozzles. The cross-sectional shape increases the contact area between the hot nozzle body and the mold, reducing heat loss to the mold and lowering energy consumption.

[0036] In this embodiment, the injection nozzle unit 22 includes a gate screw 221 that is threadedly mounted on the right end of the hot nozzle body 211, and a heat insulation cap 222 is fixedly mounted on the right end of the gate screw 221.

[0037] The 221 threaded gate cap facilitates disassembly and replacement, resolving overflow issues caused by gate wear. The 222 heat shield prevents heat transfer from the gate to the mold, preventing localized overheating from affecting the cooling and solidification of the plastic part.

[0038] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0039] During operation, the hot nozzle body 211 is first fixedly installed inside the flange 1 with bolts. The valve needle 214 is inserted into the valve needle sleeve 215 and the valve needle channel 213. The valve needle sleeve 215 is padded with a rubber pad 216. The limiting tube 217 is threadedly installed inside the valve needle channel 213. One end of the limiting tube 217 is inserted into the valve needle sleeve 215. The gate screw 221 is threadedly installed at the outlet of the flow channel 212.

[0040] During operation, valve needle 214 moves to the left, and the right end of valve needle 214 separates from the inside of gate 221, thus opening gate 221. Embedded heating wire 218 heats the inside of flow channel 212, and the melt flows out through flow channel 212 and gate 221. When valve needle 214 moves to the right, valve needle 214 contacts gate 221, thus closing gate 221. The opening and closing operation of valve needle 214 and gate 221 is completed inside gate 221.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A split-type valve needle independent flow control hot nozzle, including a flange (1), characterized in that: The flange (1) is internally provided with a split mechanism (2) for realizing the independence of the valve needle. The split mechanism (2) includes: The valve needle unit (21) is located inside the flange (1) and includes a hot nozzle body (211). The hot nozzle body (211) has a flow channel (212) and a valve needle channel (213) inside. The right end outlet of the flow channel (212) is coaxial with the valve needle channel (213). A valve needle (214) is slidably installed inside the valve needle channel (213). The valve needle is independent by separating the flow channel (212) and the valve needle (214). The injection port unit (22) is located on the right side of the valve needle unit (21) and is used to open and close with the valve needle (214).

2. The split-type valve needle independent flow control hot nozzle according to claim 1, characterized in that: A valve needle sleeve (215) is fixedly installed inside the valve needle channel (213). A limiting tube (217) is rotatably installed inside the valve needle channel (213) and one end of the limiting tube (217) is inserted into the valve needle sleeve (215). The valve needle (214) slides inside the limiting tube (217) and the valve needle sleeve (215) to limit the movement of the valve needle (214).

3. The split-type valve needle independent flow control hot nozzle according to claim 2, characterized in that: A rubber pad (216) is fixedly installed between the limiting tube (217) and the valve needle sleeve (215) to seal the connection between the limiting tube (217) and the valve needle sleeve (215).

4. The split-type valve needle independent flow control hot nozzle according to claim 1, characterized in that: The interior of the hot nozzle body (211) is fixedly installed with a number of embedded heating wires (218) through grooves. The hot nozzle body (211) is heated by the embedded heating wires (218), thereby heating the melt flowing inside the flow channel (212).

5. The split-type valve needle independent flow control hot nozzle according to claim 1, characterized in that: The outer contour of the hot nozzle body (211) adopts an elliptical or shoulder-shaped cross section, and its major axis is perpendicular to the arrangement direction of adjacent hot nozzles.

6. The split-type valve needle independent flow control hot nozzle according to claim 1, characterized in that: The injection nozzle unit (22) includes a gate valve (221) that is threadedly mounted on the right end of the hot nozzle body (211), and a heat insulation cap (222) is fixedly mounted on the right end of the gate valve (221).

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