Hot nozzle preparation method and hot nozzle

Abstract

The invention belongs to the technical field of hot runner systems, and discloses a hot nozzle preparation method and a hot nozzle. The preparation method of the hot nozzle comprises the following steps: processing a heating channel in the hot nozzle body, wherein the heating channel extends to the foremost end of the hot nozzle body; the heating element is arranged in the heating channel, so that at least part of the heating area of the heating element extends to the end, close to the foremost end of the hot nozzle body, of the heating channel, and the foremost end of the hot nozzle body is directly heated. The heating element directly acts on the foremost end of the hot nozzle body, so that the heat transfer path is shortened, the heat loss in the transfer process is reduced, and the heat transfer efficiency is improved. Besides, the foremost end of the hot nozzle body is directly heated by the heating element, so that the foremost end of the hot nozzle body can obtain more direct heat supply, the problem of non-uniform heat distribution is solved, and the condition that the temperature of the foremost end of the hot nozzle body is insufficient is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hot runner systems, and in particular to a hot nozzle preparation method and a hot nozzle. Background Art

[0002] Hot nozzles are widely used in injection molding, hot melt extrusion and other fields, and they play the important role of heating the material to a molten state and transporting it to the designated workstation.

[0003] In the existing technology, the heating of the hot nozzle mostly adopts the traditional external heating method. Its structure is usually to set a heating element (such as a heating coil or heating sleeve) on the outside of the hot nozzle body. The working principle is to generate heat by energizing the heating element, and then rely on heat conduction to transfer the heat from the outside of the hot nozzle to the inside, and finally make the whole hot nozzle temperature rise to meet the material heating requirements.

[0004] However, when heat is transferred from the outside of the nozzle to the front end, the transfer efficiency is low due to the long heat conduction path and large heat loss. It is also difficult to ensure uniform heat distribution, resulting in insufficient temperature at the tip of the nozzle.

[0005] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] The object of the present invention is to provide a method for preparing a hot nozzle and a hot nozzle, so as to improve the heat transfer efficiency and improve the problem of uneven heat distribution, thereby avoiding the situation where the temperature at the front end of the hot nozzle body is insufficient.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A method for preparing a hot nozzle, comprising the following steps:

[0009] A heating channel is machined in the nozzle body, and the heating channel extends to the front end of the nozzle body;

[0010] The heating element is arranged in the heating channel so that the heating area of ​​the heating element at least partially extends to the end of the heating channel close to the front end of the nozzle body, so as to directly heat the front end of the nozzle body.

[0011] Preferably, the hot nozzle preparation method further comprises the following steps:

[0012] The gaps in the heating channel are filled with thermally conductive material.

[0013] Preferably, the hot nozzle preparation method further comprises the following steps:

[0014] The heating channel is sealed at the front end of the hot nozzle body by using wear-resistant material.

[0015] Preferably, the heating channel is a blind hole, and the closed side of the blind hole is close to the front end of the hot nozzle body.

[0016] Preferably, the wear-resistant material forms a pointed end at the front end of the hot nozzle body.

[0017] Preferably, a glue injection port is provided on the tip.

[0018] Preferably, the thermally conductive material is lead.

[0019] Preferably, the heating element is a heating wire.

[0020] A hot nozzle, comprising a hot nozzle body and a heating element, wherein:

[0021] A heating channel is provided in the nozzle body, and the heating channel extends to the front end of the nozzle body;

[0022] The heating element is arranged in the heating channel and is used to directly heat the front end of the nozzle body.

[0023] Preferably, the heating channel extends from the side or rear of the hot nozzle body to the front end of the hot nozzle body.

[0024] Beneficial effects of the present invention:

[0025] Because the heating element directly acts on the front end of the nozzle body, the heat transfer path is shortened, reducing heat loss during the transfer process and improving heat transfer efficiency. Furthermore, by directly heating the front end of the nozzle body through the heating element, the front end of the nozzle body receives a more direct heat supply, improving the problem of uneven heat distribution and avoiding insufficient temperature at the front end of the nozzle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of the method for preparing a hot nozzle provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of the hot nozzle provided by the present invention;

[0028] Figure 3 It is a structural schematic diagram of the front end of the hot nozzle provided by the present invention.

[0029] In the picture:

[0030] 1. Nozzle body; 2. Heating channel; 3. Heating element; 4. Tip. DETAILED DESCRIPTION

[0031] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0032] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0033] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent three situations: the existence of a centrifugal vortex magnetic pump alone, the existence of a centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump at the same time, and the existence of a centrifugal vortex magnetic pump alone. In addition, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0034] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0035] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0036] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0037] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0038] See also Figures 1 to 3 This embodiment provides a method for preparing a hot nozzle, which includes the following steps:

[0039] A heating channel 2 is machined in the nozzle body 1 and extends to the front end of the nozzle body 1;

[0040] The heating element 3 is disposed in the heating channel 2 so that the heating area of ​​the heating element 3 at least partially extends to the front end of the heating channel 2 close to the nozzle body 1, so as to directly heat the front end of the nozzle body 1.

[0041] This arrangement allows the heating element 3 to directly act on the front end of the nozzle body 1, shortening the heat transfer path and reducing heat loss during the transfer process, thereby improving heat transfer efficiency. Furthermore, by having the heating element 3 directly heat the front end of the nozzle body 1, the front end of the nozzle body 1 receives a more direct heat supply, improving the problem of uneven heat distribution and avoiding insufficient temperature at the front end of the nozzle body 1.

[0042] It's important to note that when processing high-temperature materials or highly abrasive materials like those containing glass fiber or mineral fiber, the nozzle's heating effectiveness and durability directly impact product quality and production efficiency. For high-temperature materials, insufficient temperature at the front end of the nozzle body 1 can lead to incomplete melting and poor fluidity. Furthermore, for highly abrasive materials like those containing glass fiber, insufficient temperature can cause intense friction at the tip 4 due to poor fluidity, exacerbating wear and tear at the front end of the nozzle body 1. This ultimately leads to wear and tear at the front end of the nozzle body 1, severely impacting the nozzle's service life and material processing effectiveness.

[0043] As can be seen above, the heating channel 2 extends to the very front end of the nozzle body 1, and the heating area of ​​the heating element 3 acts directly on the front end of the nozzle body 1. Heat does not need to be conducted externally via a long path, but instead forms a direct heat source within the nozzle body 1 to the very front end. This significantly reduces heat loss during heat transfer, allowing the front end of the nozzle body 1 to quickly reach the required melting temperature for high-temperature materials. When the material receives sufficient heat at the front end of the nozzle body 1, molecular chain movement becomes more active, the melt state becomes more uniform, and fluidity naturally improves, thus avoiding the problem of incomplete melting caused by insufficient temperature.

[0044] Correspondingly, highly abrasive materials such as glass fiber fully melt at a sufficient temperature, improving their fluidity and allowing them to pass more smoothly through the front end of the nozzle body 1, reducing the frequency and intensity of friction caused by stagnation. Secondly, because heat acts directly on the front end of the nozzle body 1, the front end of the nozzle body 1 itself is at a higher temperature, and the contact between the material and the front end surface of the nozzle body 1 is more inclined to molten sliding, further reducing the intensity of friction. On this basis, even if the material itself is abrasive, the wear and tear on the front end of the nozzle body 1 will be reduced due to the reduced friction intensity, thereby extending the service life of the nozzle and ensuring the stability of the material processing effect.

[0045] In this embodiment, the heating element 3 is a heating wire. The heating wire is slender and easily formed, allowing it to better fit into the heating channel 2 extending to the front end of the nozzle body 1. In particular, when the heating channel 2 is elongated due to structural limitations of the nozzle body 1, the heating wire can be precisely positioned within the heating channel 2 by bending, threading, or other methods, ensuring that its heating area can stably extend to a position close to the front end of the nozzle body 1.

[0046] More importantly, the heating wire, as a linear heating element, has a continuously distributed heating area along the extension of the heating channel 2. Once the heating wire is positioned within the heating channel 2, heat is continuously supplied along the nozzle body 1, rather than the discontinuous heat supply pattern of traditional external heating methods, where an external heat source radiates internally. This ensures continuous and direct heat input to the very front end of the nozzle body 1, further improving the problem of insufficient temperature at the very front end of the nozzle body 1 found in traditional methods.

[0047] It should be noted that the heating wire is conventional technology. Its operating principle is that when energized, the heating wire utilizes its own resistance characteristics. When current passes through it, it generates heat due to the Joule effect. This heat is then transferred to the nozzle body 1 through direct contact or through a thermally conductive material. This will not be described in detail. It should also be noted that in other embodiments, the heating element 3 can also be a conventional heating structure such as a heating rod or a heating plate, so this will not be described in detail.

[0048] Generally speaking, if there are gaps in the heating channel 2, significant thermal resistance will be formed. Specifically, the heat generated by the heating element 3 must first pass through the air layer before it can be transferred to the nozzle body 1, resulting in some heat loss inside the heating channel 2, affecting the heating effect.

[0049] For this purpose, the hot nozzle preparation method further comprises the following steps:

[0050] The gaps in the heating channel 2 are filled with thermally conductive material.

[0051] Once the thermally conductive material fills the heating channel 2, it maintains close contact with the heating element 3 and the inner wall of the heating channel 2, eliminating thermal resistance caused by air gaps. Heat is transferred directly and quickly from the heating element 3 to the nozzle body 1 through the thermally conductive material, reducing heat loss within the channel and further ensuring sufficient heat is available at the very front of the nozzle body 1. This is particularly suitable for high-temperature materials requiring high heat input.

[0052] In addition, the thermally conductive material has good thermal diffusivity. After filling, it can evenly conduct the heat of the heating element 3 to the nozzle body 1 around the heating channel 2, so that the heat can be diffused more widely and evenly, thereby avoiding local temperature fluctuations caused by poor contact, ensuring a more balanced temperature distribution at the front end of the nozzle and the entire nozzle, which not only solves the problem of insufficient melting of high-temperature materials, but also reduces the fluidity fluctuations of highly abrasive materials such as glass fiber caused by local temperature fluctuations.

[0053] In addition, the heat-conducting material can be solidified and formed after filling, so as to stably fix the heating element 3 in the channel to prevent displacement or collision due to vibration or deformation.

[0054] In this embodiment, the thermally conductive material is lead. Lead has a low melting point and readily melts, filling the gaps in the heating channel 2. It can closely adhere to the heating element 3 and the inner wall of the heating channel 2, eliminating gaps and enhancing thermal conductivity. Furthermore, lead exhibits good ductility and can adapt to slight deformations of the nozzle body 1, maintaining contact stability. It is also relatively low-cost and suitable for industrial mass production. In other embodiments, the thermally conductive material can also be selected from existing materials with high thermal conductivity, such as thermal paste and graphite powder, which will not be described in detail.

[0055] In order to further improve the heating effect, the hot nozzle preparation method further includes the following steps:

[0056] The heating channel 2 is sealed at the front end of the nozzle body 1 by using wear-resistant material.

[0057] As you can understand, the wear-resistant material seal enhances the wear resistance of the front end of the nozzle, protecting it from erosion and wear from molten material, and extending its service life. Furthermore, the seal isolates the heating channel 2 from the injection port, preventing material from seeping into the heating channel 2 and causing blockage or corrosion of the heating element 3, thus ensuring heating stability.

[0058] In other embodiments, to improve processing efficiency, the heating channel 2 is formed as a blind hole, with the closed side of the blind hole positioned near the front end of the nozzle body 1. As can be appreciated, heat near the closed side is less likely to diffuse toward the rear end of the nozzle body 1, concentrating the heat at the front end of the nozzle body 1, reducing heat dissipation and facilitating the maintenance of a high front temperature. It is also appreciated that directly forming the heating channel 2 as a blind hole reduces the number of steps and improves efficiency.

[0059] It should be noted that the wear-resistant material may be a highly wear-resistant material such as cemented carbide, high-chromium cast iron, etc., and the heating channel 2 may be sealed by brazing. This embodiment does not impose any specific requirements or restrictions on this.

[0060] Specifically, the wear-resistant material forms a tip 4 at the very front end of the nozzle body 1. Due to its small size and low heat capacity, the tip 4 quickly absorbs and transfers heat, maintaining a constant high temperature near the injection port. This prevents the material from solidifying and clogging due to a sudden drop in temperature during flow, thus ensuring the material's melt flowability. Furthermore, the wear-resistant material is much stronger than the nozzle body 1. After being securely bonded to the nozzle body through brazing, the tip 4 can withstand the high pressure impacts of injection molding, preventing deformation of the injection port due to excessive force and maintaining the dimensional accuracy of the injection port over time.

[0061] Furthermore, a glue injection port (not shown) is provided on the tip 4. The tip 4 is the area at the front end of the nozzle body 1 where heat is most concentrated. This location allows the glue injection port to be directly exposed to a high-temperature environment, reducing the risk of material solidification at the injection port due to a sudden drop in temperature, avoiding blockage and ensuring the stability of continuous injection molding. Furthermore, the glue injection port and the tip 4, made of wear-resistant material, are integrally machined, eliminating the need for additional connecting components. This reduces structural gaps and the possibility of material infiltrating the joint between the tip 4 and the nozzle body 1. This also makes the front end structure more compact, with higher mechanical strength, and can withstand higher injection pressures.

[0062] This embodiment also provides a hot nozzle, comprising a nozzle body 1 and a heating element 3. A heating channel 2 is provided within the nozzle body 1, extending to the front end of the nozzle body 1. The heating element 3 is disposed within the heating channel 2 and is configured to directly heat the front end of the nozzle body 1.

[0063] It can be understood that the heat transfer efficiency of the hot nozzle prepared by the above-mentioned hot nozzle preparation method is improved, the problem of uneven heat distribution is improved, and the situation of insufficient temperature at the front end of the hot nozzle body 1 is avoided.

[0064] To ensure the structural strength of the nozzle body 1, the heating channel 2 extends from the side or rear of the nozzle body 1 to the very front end. The front end of the nozzle body 1 houses the core area of ​​the injection port and the wear-resistant tip 4, which must withstand the impact of high-pressure injection molding, material erosion, and high-temperature cycles, placing extremely high demands on structural strength and dimensional accuracy. Therefore, extending from the side or rear completely avoids structural damage to the core functional area at the front end of the nozzle body 1, ensuring the mechanical stability and dimensional accuracy of the front end of the nozzle body 1.

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a hot nozzle, characterized in that: The hot nozzle preparation method comprises the following steps: A heating channel (2) is machined in the nozzle body (1), and the heating channel (2) extends to the front end of the nozzle body (1); The heating element (3) is arranged in the heating channel (2) so that the heating area of ​​the heating element (3) at least partially extends to the end of the heating channel (2) close to the front end of the nozzle body (1), so as to directly heat the front end of the nozzle body (1).

2. A method for preparing a hot nozzle according to claim 1, characterized in that: The hot nozzle preparation method further comprises the following steps: A heat-conducting material is used to fill the gaps in the heating channel (2).

3. A method for preparing a hot nozzle according to claim 1, characterized in that: The hot nozzle preparation method further comprises the following steps: The heating channel (2) is sealed with wear-resistant material at the front end of the nozzle body (1).

4. A method for preparing a hot nozzle according to claim 1, characterized in that: The heating channel (2) is a blind hole, and the closed side of the blind hole is close to the front end of the nozzle body (1).

5. A method for preparing a hot nozzle according to claim 3, characterized in that: The wear-resistant material forms a tip (4) at the front end of the nozzle body (1).

6. A method for preparing a hot nozzle according to claim 5, characterized in that: The tip (4) is provided with a glue injection port.

7. A method for preparing a hot nozzle according to claim 2, characterized in that: The thermal conductive material is lead.

8. A method for preparing a hot nozzle according to claim 1, characterized in that: The heating element (3) is a heating wire.

9. A hot nozzle, characterized in that: The hot nozzle comprises a hot nozzle body (1) and a heating element (3), wherein: A heating channel (2) is provided in the nozzle body (1), and the heating channel (2) extends to the front end of the nozzle body (1); The heating element (3) is arranged in the heating channel (2) and is used to directly heat the front end of the nozzle body (1).

10. The hot nozzle according to claim 9, characterized in that: The heating channel (2) extends from the side or rear of the hot nozzle body (1) to the front end of the hot nozzle body (1).

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