Guide sleeve structure and hot runner system

Abstract

The utility model relates to the technical field of hot runners, and discloses a guide sleeve structure and a hot runner system.The guide structure comprises a guide sleeve body arranged at the joint of an air cylinder and a first runner, and the guide sleeve body is provided with a transition section extending into a second runner communicated with the first runner; the section of the end, facing the second runner, of the transition section is a curved surface. According to the guide sleeve structure provided by the utility model, the transition section of the guide sleeve body extends to the second flow channel communicated with the first flow channel, so that the flow channels are communicated more smoothly, the flow path of gas at the matching part of the guide sleeve and the splitter plate is optimized, and the accumulation of decomposition gas of a fireproof material at a gap is reduced. Meanwhile, due to the curved surface design of the end part of the transition section, the attachment probability of decomposed substances is reduced, and the formation of black powder is avoided; furthermore, during injection molding, black impurities entering a product are reduced, the problem of different colors of the product is effectively avoided, and the appearance quality and the yield of the product are improved.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, specifically to a guide sleeve structure and a hot runner system. Background Technology

[0002] In the production of fire-retardant (PC) materials using hot runner needle valve systems, the fire-retardant material itself is heat-sensitive. During long-term production, gases produced by the material's decomposition adhere to the gap between the guide sleeve and the manifold. However, since this gap cannot be structurally fitted with venting channels, the adhered material gradually turns into black powder after prolonged exposure. During injection molding, these black impurities enter the product along with the plastic fire-retardant material, ultimately causing discoloration issues.

[0003] In the production of fire-retardant (PC) materials using hot runner needle valve systems, the heat-sensitive nature of the fire-retardant material causes it to decompose and generate gases during prolonged production. These gases are difficult to expel effectively at the junction of the guide sleeve and the manifold because the transition section of the existing guide sleeve structure cannot smoothly connect with the flow channel, and the end section is planar. Consequently, the decomposition products easily adhere to the gap between the guide sleeve and the manifold. Since no venting channels can be installed in this gap, the adhered material gradually turns into black powder after prolonged exposure. During injection molding, these black impurities enter the product along with the fire-retardant plastic, ultimately causing discoloration and severely impacting product quality. Utility Model Content

[0004] In view of this, the present invention provides a guide sleeve structure and a hot runner system to solve the problem of product discoloration caused by the blackening of gasification material adhering to the gap between the guide sleeve and the manifold during long-term production.

[0005] In a first aspect, this utility model provides a guide sleeve structure, comprising:

[0006] The guide sleeve body is disposed at the connection between the cylinder and the first flow channel. The guide sleeve body has a transition section extending into a second flow channel that communicates with the first flow channel. The end section of the transition section facing the second flow channel is curved.

[0007] Optionally, the curved surface is an arc surface facing away from the indentation of the second flow channel.

[0008] Optionally, the highest point of the arc surface is flush with the highest point of the second flow channel, and the lowest point of the arc surface extends into the first flow channel and is set lower than the lowest point of the second flow channel.

[0009] Optionally, the guide sleeve body is interference-fitted with the inner cavity surface of the first flow channel.

[0010] Optionally, the outer diameter of the guide sleeve body is larger than the inner diameter of the first flow channel, and the difference ranges from 0.005 mm to 0.008 mm.

[0011] Optionally, it also includes:

[0012] An insert, which is fitted at the connection between the first flow channel and the second flow channel, has an arc-shaped transition surface for connecting the first flow channel and the second flow channel.

[0013] Optionally, the insert is a columnar insert.

[0014] Optionally, the cylinder moves in the same direction as the axis of the first flow channel.

[0015] Optionally, the first flow channel and the second flow channel are arranged perpendicular to each other.

[0016] Beneficial effects

[0017] The guide sleeve structure provided by this utility model includes a guide sleeve body disposed at the connection between the cylinder and the first flow channel. The guide sleeve body has a transition section extending into a second flow channel communicating with the first flow channel. The end section of the transition section facing the second flow channel is curved. The extension of the transition section of the guide sleeve body into the second flow channel makes the flow channel connection smoother, optimizes the gas flow path at the interface between the guide sleeve and the distributor plate, and reduces the accumulation of decomposition gases from the fire retardant material at the gap. Simultaneously, the curved design at the end of the transition section reduces the probability of adhesion of decomposition substances, avoiding the formation of black powder; thus, during injection molding, it reduces black impurities entering the product, effectively preventing discoloration problems and improving product appearance quality and yield.

[0018] Secondly, this utility model also provides a hot runner system, including the guide sleeve structure described in any of the above. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional schematic diagram of a hot runner system according to an embodiment of the present invention;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Guide sleeve body; 11. Transition section; 12. Arc surface; 2. Cylinder; 3. First flow channel; 4. Second flow channel; 5. Insert. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, in one aspect, a guide sleeve structure is provided, comprising:

[0026] The guide sleeve body 1 is located at the connection between the cylinder 2 and the first flow channel 3. The guide sleeve body 1 has a transition section 11 extending into the second flow channel 4 which is connected to the first flow channel 3. The end section of the transition section 11 facing the second flow channel 4 is curved.

[0027] The guide sleeve structure provided in this embodiment has a transition section 11 extending from the guide sleeve body 1 to the second flow channel 4, which communicates with the first flow channel 3. This makes the flow channel connection smoother, optimizes the gas flow path at the interface between the guide sleeve and the flow divider, and reduces the accumulation of decomposition gases from the fire retardant material at the gap. Simultaneously, the curved surface design at the end of the transition section 11 causes the fire retardant material to impact the curved surface at different speeds, reducing the probability of adhesion of decomposition substances and preventing the formation of black powder. Furthermore, during injection molding, this reduces black impurities entering the product, effectively preventing discoloration issues and improving product appearance quality and yield. The curved surface is formed by a cutting tool obliquely cutting the end of the transition section 11 away from the cylinder 2 along a certain arc.

[0028] Furthermore, the curved surface is an arc surface 12 that is recessed away from the second flow channel 4.

[0029] Intuitively, the recessed arc surface 12 guides the smooth discharge of gases decomposing from the fire-retardant material, reducing their accumulation in the gap between the guide sleeve and the diverter plate. This curved surface forms a smooth flow channel, reducing gas flow resistance and allowing it to pass quickly through the gap without lingering. Simultaneously, the irregularity of the curved surface structure causes gases to impact the surface at varying speeds, further mitigating the problem of gas adhering to the guide sleeve surface. The curved surface can be a regular arc surface or a combination of multiple irregular curved surfaces with protrusions or recesses connected together.

[0030] In an optional embodiment, the recessed arc surface 12 can be approximated by a segmented combination of planes. Designing the end of the guide sleeve as multiple interconnected small planes, while not forming a perfect flow curve, can still guide gas flow and reduce impurity adhesion to a certain extent. Furthermore, it is easy to manufacture, requires less precision from equipment, and can reduce costs, making it suitable for production scenarios where cost control is paramount and product quality requirements are moderate.

[0031] Furthermore, the highest point of the arc surface 12 is flush with the highest point of the second flow channel 4, and the lowest point of the arc surface 12 extends into the first flow channel 3 and is set below the lowest point of the second flow channel 4.

[0032] Intuitively, when the highest point of the arc surface 12 is flush with the highest point of the second flow channel 4, and the lowest point extends to the first flow channel 3 but is lower than the lowest point of the second flow channel 4, the gas transition path is optimized, allowing the fire-retardant material to flow unimpeded from the second flow channel 4 to the first flow channel 3, reducing the probability of it accumulating in the gaps. Simultaneously, extending to the lowest point of the first flow channel 3 allows any potentially adhering impurities to be quickly carried away by the fire-retardant material, preventing accumulation, discoloration, and the formation of black powder, ensuring product quality, and improving the stability and production efficiency of the hot runner needle valve system.

[0033] Furthermore, the guide sleeve body 1 and the inner cavity surface of the first flow channel 3 are interference-fitted.

[0034] In essence, the interference fit between the guide sleeve body 1 and the inner cavity of the first flow channel 3 enhances sealing performance, prevents leakage of fire-retardant material, and reduces the risk of gas accumulation in the gaps. It also improves structural stability, preventing guide sleeve displacement and loosening, ensuring stable flow channel connectivity, and guaranteeing smooth flow of fire-retardant material. Furthermore, it reduces the amount of fire-retardant material entering the flow channel gaps, preventing its accumulation and subsequent degradation and discoloration, maintaining the normal operation of the hot runner needle valve system, and improving product quality and production efficiency.

[0035] Furthermore, the outer diameter of the guide sleeve body 1 is larger than the inner diameter of the first flow channel 3, and the difference ranges from 0.005 mm to 0.008 mm.

[0036] It should be noted that the outer diameter of the guide sleeve body 1 is 0.005mm to 0.008mm larger than the inner diameter of the first flow channel 3. This precision difference ensures an ideal interference fit. During assembly, it avoids poor sealing and structural instability due to insufficient interference, and also prevents assembly difficulties or component damage due to excessive interference. In terms of sealing, it effectively fills the flow channel gaps, enhances sealing performance, prevents leakage of fire-retardant materials, and reduces the risk of gas accumulation in the gaps. Regarding structural stability, it ensures a tight fit between the guide sleeve body 1 and the first flow channel 3, preventing displacement and loosening, ensuring stable flow channel connectivity, and allowing smooth flow of gas and fire-retardant materials. Furthermore, it prevents impurities from accumulating in the flow channel gaps, maintains the normal operation of the hot runner needle valve system, helps improve product quality and production efficiency, and ensures long-term stable production. Specifically, during installation, the guide sleeve body 1 is first frozen in liquid nitrogen for 30 minutes before being assembled into the first flow channel 3. When the temperature of the guide sleeve body 1 matches that of the first flow channel 3, it is in an interference fit state, with no gap space between the two parts.

[0037] Of course, in other alternative embodiments, other suitable differences can be set according to the actual production equipment. Here, the specific range of the difference setting is not limited.

[0038] Furthermore, it also includes:

[0039] Insert 5 is fitted at the connection between the first flow channel 3 and the second flow channel 4, and has an arc-shaped transition surface for connecting the first flow channel 3 and the second flow channel 4.

[0040] It should be noted that the insert 5 makes the connection between the two flow channels smoother, eliminates right angles and sharp corners, optimizes the flow path, and makes the transition of the fire retardant material smoother; it can reduce the resistance at the connection, improve the uniformity of the flow rate, and improve the injection molding efficiency; it can also reduce the adhesion of fire retardant decomposition products, reduce the possibility of black powder formation, ensure product quality, and maintain the stable operation of the hot runner needle valve system. Specifically, a first mounting hole is provided vertically inside the insert 5, and at the same time, a second mounting hole is provided horizontally to connect with the second flow channel. At the intersection of the first mounting hole and the second mounting hole, an arc-shaped transition surface is formed that smoothly connects with the inner wall of the first flow channel 3 and the inner wall of the second flow channel 4, respectively.

[0041] Specifically, inlay 5 is a columnar inlay.

[0042] It is easy to understand that during the installation process, the regular columnar shape of the columnar insert facilitates positioning and installation, and can be accurately fitted at the connection between the first flow channel 3 and the second flow channel 4, reducing installation errors and improving assembly efficiency.

[0043] Specifically, the direction of movement of cylinder 2 is the same as the axial direction of the first flow channel 3.

[0044] It is easy to understand that when the movement direction of cylinder 2 is in the same direction as the axis of the first flow channel 3, the thrust generated by cylinder 2 can act directly and efficiently on the fireproof material in the first flow channel 3, avoiding energy loss caused by deviation of the force direction and maximizing the utilization of power.

[0045] Specifically, the first flow channel 3 and the second flow channel 4 are arranged perpendicular to each other.

[0046] According to an embodiment of the present invention, another aspect provides a hot runner system, including the guide sleeve structure described in any of the above embodiments.

[0047] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A guide sleeve structure, characterized by, Comprising: A guide sleeve body (1) is arranged at the connection between the cylinder (2) and the first flow channel (3), the guide sleeve body (1) has a transition section (11) extending into the second flow channel (4) arranged in communication with the first flow channel (3), the cross section of the transition section (11) towards the end of the second flow channel (4) is curved.

2. The guide sleeve structure of claim 1, wherein The curved surface is a circular arc surface (12) which is recessed away from the second flow channel (4).

3. The guide sleeve structure of claim 2, wherein The highest point of the circular arc surface (12) is flush with the highest point of the second flow channel (4), the lowest point of the circular arc surface (12) extends into the first flow channel (3) and is arranged lower than the lowest point of the second flow channel (4).

4. The guide sleeve structure according to any one of claims 1-3, characterized in that, The guide sleeve body (1) is interference fit with the inner cavity surface of the first flow channel (3).

5. The guide sleeve structure of claim 4, wherein The outer diameter of the guide sleeve body (1) is greater than the inner diameter of the first flow channel (3), and the difference is in the range of 0.005mm to 0.008mm.

6. The guide sleeve structure of any one of claims 1-3, wherein, Also comprising: An insert (5) is arranged at the connection between the first flow channel (3) and the second flow channel (4), and has an arc-shaped transition surface for connecting the first flow channel (3) and the second flow channel (4).

7. The guide sleeve structure of claim 6, wherein The insert (5) is a cylindrical insert.

8. The guide sleeve structure of any one of claims 1-3, wherein, The movement direction of the cylinder (2) is the same as the axial direction of the first flow channel (3).

9. The guide sleeve structure of any one of claims 1-3, wherein, The first flow channel (3) and the second flow channel (4) are arranged perpendicular to each other.

10. A hot runner system characterized by, Comprising: The guide sleeve structure of any one of claims 1-9.

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