External cooling single-point needle valve hot nozzle

Abstract

The utility model provides an external cooling single-point needle valve hot nozzle. The external cooling single-point needle valve hot nozzle comprises an air cylinder unit, an injection nozzle body, a hot nozzle body, a hot nozzle heating ring and a valve needle assembly, wherein the injection nozzle body is positioned in the air cylinder unit; the hot nozzle heating ring extends outwards from one side of the air cylinder unit; the needle sealing connector and the needle opening connector are connected with one side of the air cylinder unit; the other end, opposite to the needle sealing connector and the needle opening connector, of the air cylinder unit is connected with a water inlet connector and a water outlet connector. The air cylinder unit comprises an air cylinder top cover, an air cylinder body, an air cylinder piston located on the inner side of the air cylinder body and a cold cutting ring base located at the bottom of the air cylinder body. The cold cutting ring base is connected with the air cylinder body through a base screw; the piston push block is connected with a piston of the air cylinder in a matched manner; in practical application, heat gathering at the central positions of the air cylinder and the hot nozzle can be well reduced, failure and abnormity of single-valve production operation are reduced, and the service life of the single-valve hot nozzle is guaranteed.

Description

[Technical Field]

[0001] This utility model relates to the technical field of single-point needle valve cylinder assembly, and in particular to an externally cooled single-point needle valve hot nozzle that can effectively reduce heat accumulation at the center of the cylinder and hot nozzle, reduce abnormal failures in single-valve production operations, and ensure the service life of the single-valve hot nozzle. [Background Technology]

[0002] The hot nozzle in a hot runner system is a key component for molten plastic to enter the mold cavity from the runner.

[0003] Traditional hot air nozzles have the following problems:

[0004] A. Low cooling efficiency: The built-in cooling channel is easily affected by thermal expansion, resulting in uneven cooling and a short lifespan for the heat nozzle.

[0005] B. Complex needle valve control: Multi-needle valve systems require multiple points of drive, resulting in complex structures and high costs.

[0006] C. Thermal stress concentration: It is prone to deformation under long-term high temperature, which affects the injection molding accuracy and product surface quality.

[0007] In existing technologies, for example, patent application number CN201620341062.3, entitled "A Cooling Mechanism for a Moving Mold Hot Nozzle," specifically discloses a cooling mechanism for a moving mold hot nozzle, belonging to the field of plastic mold manufacturing technology. It solves the problems of poor cooling effect and uncontrollable temperature in existing injection mold hot nozzle cooling devices. This moving mold hot nozzle cooling mechanism includes a moving mold, a fixed mold, and a hot nozzle inserted within the fixed mold. The cooling device includes a cooling water well, an inlet channel, and an outlet channel, all located within the moving mold. The upper part of the cooling water well is a cooling chamber, which is located below the hot nozzle. The inlet channel and outlet channel are both connected to the cooling water well. The cooling water well is equipped with a guide component that allows cooling water flowing from the inlet channel into the cooling water well to pass through the cooling chamber and then flow to the outlet channel. This moving mold hot nozzle cooling mechanism can quickly reduce the temperature of the hot nozzle and the injection molded part, and the technology uses a built-in cooling structure. However, it cannot solve the problem of melt leakage caused by excessively high temperatures on the outer wall of the hot nozzle.

[0008] Therefore, there is an urgent need for a heat nozzle solution that is highly efficient in cooling, simple in structure, and has a long service life. [Utility Model Content]

[0009] The problem with the prior art that this application addresses is:

[0010] A. Low cooling efficiency: The built-in cooling channel is easily affected by thermal expansion, resulting in uneven cooling and a short lifespan for the heat nozzle.

[0011] B. Complex needle valve control: Multi-needle valve systems require multiple points of drive, resulting in complex structures and high costs.

[0012] C. Thermal stress concentration: Prolonged exposure to high temperatures can easily lead to deformation, affecting injection molding accuracy and product surface quality.

[0013] The solution to the technical problem of this utility model is:

[0014] An externally cooled single-point needle valve hot nozzle is provided, comprising a cylinder unit, an injection nozzle body located inside the cylinder unit, a hot nozzle body, a hot nozzle heating coil extending outward from one side of the cylinder unit, and a valve needle assembly; it also includes a sealing needle connector and an opening needle connector connected to one side of the cylinder unit; the other end of the cylinder unit relative to the sealing needle connector and the opening needle connector is connected to a water inlet connector and a water outlet connector; the cylinder unit includes a cylinder top cover, a cylinder body, a cylinder piston located inside the cylinder body, and a cold-cutting ring base located at the bottom of the cylinder body; the cold-cutting ring base... The base is connected to the cylinder body via base screws; it also includes a piston pusher block that matches and connects to the cylinder piston; both sides of the piston pusher block are connected to the cylinder piston via pusher block screws; an injection nozzle core is provided on the outer side of the injection nozzle body; and a through hole is provided in the center of the cylinder top cover to expose the injection nozzle core; gas drives the cylinder piston, and the piston pusher block drives the valve needle assembly to move up and down, thereby realizing the opening and closing action of the valve needle assembly; the valve needle assembly includes a valve needle and a valve needle sleeve; it also includes an injection nozzle heating coil located on the outer side of the injection nozzle body.

[0015] Preferably, a gas channel is formed inside the heating coil of the heating nozzle and the injection nozzle body; the gas channel is connected to the injection nozzle core; and an opening is formed at one end of the heating coil of the heating nozzle.

[0016] Preferably, the push block screws are arranged symmetrically to each other; the bottom sides of the cylinder piston are L-shaped to be embedded in the push block screws.

[0017] Preferably, the valve needle assembly is located at the center of the inner side of the cylinder unit.

[0018] Preferably, the outer wall of the hot nozzle body is provided with a spiral cooling groove; the pitch of the spiral cooling groove gradually increases from the head to the tail of the hot nozzle; the driving unit of the valve needle assembly is a servo motor or a pneumatic cylinder; and the surface of the hot nozzle body is plated with a nickel-based wear-resistant layer.

[0019] The technical effects achieved by this application in solving the technical problem are as follows:

[0020] Compared with the prior art, the structure of the externally cooled single-point needle valve hot nozzle of this utility model adopts the following technical solution: a cylinder unit, an injection nozzle body inside the cylinder unit, a hot nozzle body, a hot nozzle heating coil extending outward from one side of the cylinder unit, and a valve needle assembly; it also includes a sealing needle connector and an opening needle connector connected to one side of the cylinder unit; the other end of the cylinder unit relative to the sealing needle connector and the opening needle connector is connected to a water inlet connector and a water outlet connector; the cylinder unit includes a cylinder top cover, a cylinder body, a cylinder piston located inside the cylinder body, and a cold-cutting ring base located at the bottom of the cylinder body; the cold-cutting ring base is connected to the cylinder body by a base screw. The system is connected to the cylinder piston; it also includes a piston pusher block that matches and connects to the cylinder piston; the piston pusher block is connected to the cylinder piston on both sides by pusher block screws; an injection nozzle core is provided on the outer side of the injection nozzle body; and a through hole is provided in the center of the cylinder top cover to expose the injection nozzle core; gas drives the cylinder piston, and the piston pusher block drives the valve needle assembly to move up and down, thereby realizing the opening and closing action of the valve needle assembly; the valve needle assembly includes a valve needle and a valve needle sleeve; it also includes an injection nozzle heating coil located on the outer side of the injection nozzle body. In practical applications, it can effectively reduce heat accumulation at the center of the cylinder and the hot nozzle, reduce single valve production operation failures and abnormalities, and ensure the service life of the single valve hot nozzle. [Image Description]

[0021] Figure 1 This is a three-dimensional structural diagram of an externally cooled single-point needle valve heat nozzle according to the present invention.

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of an externally cooled single-point needle valve heat nozzle according to this utility model. [Detailed Implementation]

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] Please see Figure 1 and Figure 2 The present invention discloses an externally cooled single-point needle valve hot nozzle 1, comprising a cylinder unit, an injection nozzle body located inside the cylinder unit, a hot nozzle body, a hot nozzle heating coil 14 extending outward from one side of the cylinder unit, and a valve needle assembly; it also includes a sealing needle connector 15 and an opening needle connector 16 connected to one side of the cylinder unit; the other end of the cylinder unit relative to the sealing needle connector 15 and the opening needle connector 16 is connected to a water inlet connector and a water outlet connector; the cylinder unit includes a cylinder top cover 11, a cylinder body 12, a cylinder piston located inside the cylinder body 12, and a cold-cutting ring base 13 located at the bottom of the cylinder body 12. The cold-cutting ring base 13 is connected to the cylinder body 12 via base screws; it also includes a piston pusher block that matches and connects to the cylinder piston; both sides of the piston pusher block are connected to the cylinder piston via pusher block screws; an injection nozzle core 171 is provided on the outer side of the injection nozzle body; and a through hole for exposing the injection nozzle core 171 is provided in the center of the cylinder top cover 11; gas drives the cylinder piston, and the piston pusher block drives the valve needle assembly to move up and down, thereby realizing the opening and closing action of the valve needle assembly; the valve needle assembly includes a valve needle and a valve needle sleeve; it also includes an injection nozzle heating coil located on the outer side of the injection nozzle body.

[0031] In some other embodiments, a gas channel is formed inside the heating coil of the heating nozzle and the injection nozzle body; the gas channel is connected to the injection nozzle core; and an opening is also formed at one end of the heating coil of the heating nozzle.

[0032] The push block screws are arranged symmetrically to each other; the bottom sides of the cylinder piston are L-shaped to be embedded in the push block screws.

[0033] The valve needle assembly is located at the center of the inner side of the cylinder unit.

[0034] The outer wall of the hot nozzle body is provided with a spiral cooling groove; the pitch of the spiral cooling groove gradually increases from the head to the tail of the hot nozzle; the driving unit of the valve needle assembly is a servo motor or a pneumatic cylinder; the surface of the hot nozzle body is plated with a nickel-based wear-resistant layer.

[0035] The externally cooled single-point needle valve cylinder consists of a cylinder (with a cooling water ring), an injection nozzle body, a hot nozzle body, a heating coil, and a valve needle assembly. Gas drives the cylinder piston, and then the piston pusher moves the valve needle up and down to open and close the valve needle.

[0036] This patented design incorporates a cooling water ring in the cylinder body 12. During single-valve production, high-temperature heating ensures stable flow of molten plastic within the flow channel, and the cooling water promptly removes heat dissipated from the outer periphery of the injection nozzle heating ring. This cooling process protects the cylinder sealing ring, extends its service life, and prevents the sealing ring from expanding due to heat, which could lead to piston jamming.

[0037] The piston moves within the cylinder, effectively reducing the temperature of the piston pusher block and preventing heat buildup at the center of the hot nozzle, overflow of adhesive during high-temperature movement of the valve needle and valve sleeve, or high-temperature dry burning and jamming of the valve needle.

[0038] This patented structure reduces heat accumulation at the center of the cylinder and hot nozzle, minimizes abnormal failures during single-valve production, and ensures the service life of the single-valve hot nozzle.

[0039] Externally cooled single-point needle valves reduce heat accumulation at the center of the cylinder and hot nozzle, minimize single-valve production operation failures and ensure the service life of single-valve hot nozzles.

[0040] By combining an external cooling system with a single-point needle valve, the problems of uneven cooling, complex structure, and short lifespan of traditional hot nozzles are solved.

[0041] Heating nozzle body:

[0042] It has an internal melt channel and an integrated spiral external cooling tank on the outer wall, which is connected to an external cooling system.

[0043] The material is a high thermal conductivity alloy (such as beryllium copper), and the surface is plated with a nickel layer to improve wear resistance.

[0044] Single-point needle valve mechanism:

[0045] Located at the hot nozzle outlet, it is driven by a single cylinder / servo motor to control the flow of melt.

[0046] The needle valve tip adopts a conical sealing structure, which forms linear contact with the inner wall of the hot nozzle, reducing wear.

[0047] External cooling system:

[0048] Independent of the hot runner, it connects to an external circulating coolant (such as water or oil) via a quick connector.

[0049] The cooling tank is designed with an involute spiral structure to optimize the flow path of the coolant and improve heat exchange efficiency;

[0050] Technical effects:

[0051] The external cooling system reduces the temperature of the outer wall of the hot nozzle by 30%-50%, reducing thermal deformation and extending service life.

[0052] The single-point needle valve simplifies the drive structure, reduces the failure rate, and achieves precise flow control (error ≤ 0.1mm).

[0053] The spiral cooling groove design improves cooling uniformity by 40%, preventing premature solidification or leakage of the melt.

[0054] Example 1:

[0055] The hot nozzle body is installed on the fixed mold side of the mold, and the external cooling tank is connected to an external constant temperature circulation device (temperature set to 80℃) through pipeline.

[0056] During injection molding, the melt enters the hot nozzle through the runner, and the needle valve is controlled by a servo motor to open and close (response time ≤ 10ms).

[0057] The coolant flows through the spiral groove at a flow rate of 0.5 m / s, carrying away the heat from the outer wall of the hot nozzle and stabilizing the temperature of the hot nozzle head at 200±5℃.

[0058] Example 2:

[0059] For high-viscosity materials (such as PC), the needle valve tip can be replaced with a hard alloy material, and the coolant can be changed to heat transfer oil to improve heat capacity.

[0060] The technical effects achieved by this application in solving the technical problem are as follows:

[0061] Compared with the prior art, the externally cooled single-point needle valve hot nozzle 1 of this utility model can effectively reduce heat accumulation at the center of the cylinder and hot nozzle in practical applications, reduce abnormal failures in single valve production operations, and ensure the service life of the single valve hot nozzle.

[0062] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An externally cooled single-point needle valve hot nozzle, characterized in that: The system includes a cylinder unit, an injection nozzle body inside the cylinder unit, a heating nozzle body, a heating coil extending outward from one side of the cylinder unit, and a valve needle assembly; it also includes a sealing needle connector and an opening needle connector connected to one side of the cylinder unit; the other end of the cylinder unit relative to the sealing needle connector and the opening needle connector is connected to a water inlet connector and a water outlet connector; the cylinder unit includes a cylinder top cover, a cylinder body, a cylinder piston located inside the cylinder body, and a cold-cutting ring base located at the bottom of the cylinder body; the cold-cutting ring base is connected to the cylinder body by base screws. The cylinder body is connected to the cylinder body; it also includes a piston pusher block that is matched and connected to the cylinder piston; the piston pusher block is connected to the cylinder piston on both sides by pusher block screws; an injection nozzle core is provided on the outer side of the injection nozzle body; and a through hole for exposing the injection nozzle core is opened at the center of the cylinder top cover; gas drives the cylinder piston, and the piston pusher block drives the valve needle assembly to move up and down, thereby realizing the opening and closing action of the valve needle assembly; the valve needle assembly includes a valve needle and a valve needle sleeve; it also includes an injection nozzle heating coil located on the outer side of the injection nozzle body.

2. The externally cooled single-point needle valve hot nozzle as described in claim 1, characterized in that: The heating element and the injection nozzle body have gas channels inside; the gas channels are connected to the injection nozzle core; and an opening is also provided at one end of the heating element.

3. The externally cooled single-point needle valve hot nozzle as described in claim 1, characterized in that: The push block screws are arranged symmetrically to each other; the bottom sides of the cylinder piston are L-shaped to be embedded in the push block screws.

4. The externally cooled single-point needle valve hot nozzle as described in claim 1, characterized in that: The valve needle assembly is located at the center of the inner side of the cylinder unit.

5. The externally cooled single-point needle valve hot nozzle as described in claim 1, characterized in that: The outer wall of the hot nozzle body is provided with a spiral cooling groove; the pitch of the spiral cooling groove gradually increases from the head to the tail of the hot nozzle; the driving unit of the valve needle assembly is a servo motor or a pneumatic cylinder; the surface of the hot nozzle body is plated with a nickel-based wear-resistant layer.

Images