Corrosion-resistant hot nozzle core structure and hot runner system

Abstract

This utility model provides a corrosion-resistant hot nozzle core structure and hot runner system, relating to the technical field of hot runner systems. It solves the technical problem in existing technologies where beryllium copper nozzle cores have poor corrosion resistance, easily leading to abnormal glue injection and affecting production. The corrosion-resistant hot nozzle core structure and hot runner system includes a beryllium copper pad with a central channel within it; a nozzle body made of stainless steel with a guide channel within it; and a first end of the nozzle body connected to the beryllium copper pad, connecting the central channel and the guide channel to form an intermediate flow channel. This utility model provides a corrosion-resistant hot nozzle core structure and hot runner system with enhanced corrosion resistance, extended nozzle structure service life, reduced component costs, the ability to mass-produce flame-retardant materials, meeting production requirements, and reducing maintenance frequency and costs.

Description

Technical Field

[0001] This utility model relates to the field of hot runner system technology, and in particular to a corrosion-resistant hot nozzle core structure and hot runner system. Background Technology

[0002] Home appliances, such as air conditioners and electrical boxes, typically require the use of flame-retardant injection molding materials. Flame-retardant materials are ordinary injection molding materials (ABS / HIPS / PP) with added halogenated flame retardants (bromine-based or phosphorus-based) to achieve the desired flame-retardant effect. Flame-retardant materials have poor flowability and heat resistance. During the injection molding process, under high temperatures and high shear, the flame retardant is prone to degradation, producing acidic gases such as hydrogen halides (HBr). HBr has high reactivity and is more likely to generate active groups. Because of the unstable double bonds in the ABS molecular chain, the active groups generated by the flame retardant trigger a reaction in these double bonds, creating a chain reaction within the molecular chain, ultimately decomposing into carbides and affecting the flowability of the rubber compound.

[0003] Flame-retardant materials are easily decomposed and highly corrosive to needle valve hot runner systems. Existing hot runner systems use beryllium copper nozzles. Because beryllium copper is relatively soft and has poor corrosion resistance, it is prone to perforation corrosion, which leads to corrosion of the beryllium copper nozzle. When the nozzle is corroded, the front end of the nozzle will not dispense glue due to its poor thermal conductivity, which in turn leads to abnormal glue feeding in the hot runner and affects production. Utility Model Content

[0004] The purpose of this invention is to provide a corrosion-resistant hot runner nozzle core structure and hot runner system to solve the technical problem in the prior art where the beryllium copper nozzle core has poor corrosion resistance, easily leading to abnormal glue injection and affecting production. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The corrosion-resistant hot nozzle core structure provided by this utility model includes: A beryllium copper pad, wherein a central channel is provided inside the beryllium copper pad; The nozzle body is made of stainless steel and has a guide channel inside. The first end of the nozzle body is connected to the beryllium copper pad so that the central channel and the guide channel are connected to form an intermediate flow channel.

[0006] As an optional implementation, a sealing adhesive is also included, which is disposed at the second end of the nozzle body to wrap the end face of the second end of the nozzle body.

[0007] As an optional implementation, the second end of the nozzle core body and the sealing adhesive are connected by an inverted snap-fit ​​structure; And / or, the undercut structure includes an undercut groove and an undercut protrusion, the undercut groove being disposed on one of the nozzle body and the sealing compound, the undercut protrusion being disposed on the other of the nozzle body and the sealing compound, and the undercut protrusion and the undercut groove cooperating with each other.

[0008] As an optional implementation, the sealing colloid is made of polyimide.

[0009] As an optional implementation, the guide channel includes an upper channel, a middle channel, and a lower channel, with the middle channel connecting the upper channel and the lower channel, and the upper channel communicating with the central channel.

[0010] As an optional implementation, the intermediate channel is a conical structure, with the large-diameter end of the conical structure connected to the upper channel and the small-diameter end of the conical structure connected to the lower channel.

[0011] As an optional implementation, the upper channel and the central channel have the same diameter.

[0012] As an optional implementation, the inner surface of the beryllium copper pad is chrome-plated.

[0013] A hot runner system includes a hot nozzle body, a sealing ring, and a corrosion-resistant hot nozzle core structure as described above, wherein the sealing ring sequentially secures the beryllium copper pad and the nozzle core body to the hot nozzle body.

[0014] As an optional implementation, a fixed mold insert is also included, with the sealing adhesive disposed between the nozzle body and the fixed mold insert. The beneficial effects of this utility model are: the corrosion-resistant hot nozzle core structure and hot runner system provided by this utility model include a beryllium copper pad and a nozzle body. A central channel is provided within the beryllium copper pad. The nozzle body is made of stainless steel and has a guide channel. The first end of the nozzle body is connected to the beryllium copper pad, so that the central channel and the guide channel are connected to form an intermediate flow channel. The intermediate flow channel is connected to the flow channel within the hot nozzle body. When the injection signal is triggered, the valve needle is in the open state, and the adhesive... The fluid flows into the central channel of the nozzle core structure through the flow channel holes inside the hot nozzle body, passing through the beryllium copper pad and the stainless steel nozzle core body, and finally into the mold cavity to form the product. The beryllium copper pad has good thermal conductivity, which meets the thermal conductivity requirements. The nozzle core body is designed to be made of stainless steel. Stainless steel has strong corrosion resistance and can withstand the corrosion of the nozzle core body by flame retardant materials. Its corrosion resistance is superior, which can extend the service life of the nozzle core structure, reduce the cost of spare parts, enable the mass production of flame retardant materials, meet production requirements, and reduce the number of maintenance times and costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial structural schematic diagram of the hot runner system in the prior art of this utility model; Figure 2 This is a perspective view of the hot nozzle core structure in the prior art of this utility model; Figure 3 This is a cross-sectional view of the hot nozzle core structure in the prior art of this utility model; Figure 4 This is a partial structural schematic diagram of the hot runner system of this utility model; Figure 5 This is a partial structural diagram of the hot nozzle core structure of this utility model; Figure 6 This is a perspective view of the hot nozzle core structure of this utility model; Figure 7 This is a front view of the hot nozzle core structure of this utility model; Figure 8 This is a cross-sectional view of the hot nozzle core structure of this utility model.

[0017] In the picture: 100. Heating nozzle structure; 200. Fixed mold insert; 110. Main body of the heating nozzle; 120. Sealing ring; 130. Hot nozzle core structure; 131. Beryllium copper pad; 132. Nozzle core body; 133. Sealing colloid; 134. Central passageway; 135. Guiding passageway; 1321. Inverted groove; 1331. Inverted protrusion; 1351, Upper Passage; 1352, Middle Passage; 1353, Lower Passage. Detailed Implementation

[0018] Please refer to the attached diagram below. Figures 1 to 8This document explains the content of this utility model and its differences from existing technologies. The technical solutions (including preferred solutions) of this utility model are further described in detail below through accompanying drawings and examples of optional embodiments. It should be noted that any technical feature or solution in this embodiment is one or more of a variety of optional technical features or solutions. For the sake of brevity, this document cannot exhaustively list all alternative technical features and solutions of this utility model, nor is it convenient to emphasize that each implementation of a technical feature is one of multiple optional implementations. Therefore, those skilled in the art should understand that any technical means provided by this utility model can be replaced, or any two or more technical means or features provided by this utility model can be combined to obtain a new technical solution. No technical feature or solution in this embodiment limits the scope of protection of this utility model. The scope of protection of this utility model should include any alternative technical solutions that can be conceived by those skilled in the art without creative effort, as well as new technical solutions obtained by combining any two or more technical means or features provided by this utility model.

[0019] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] This invention provides a corrosion-resistant hot nozzle core structure and hot runner system that has stronger corrosion resistance, extends the service life of the nozzle core structure, reduces parts costs, enables mass production of flame-retardant materials, meets production requirements, and reduces maintenance frequency and costs.

[0022] The following is combined Figures 1 to 8 The technical solution provided by this utility model will be described in more detail.

[0023] In the prior art, the needle valve hot runner system includes a main nozzle, a manifold, a hot nozzle structure 100, a needle valve system, and a fixed mold insert 200. Since the main nozzle, manifold, and needle valve system are all existing technologies, they are not shown in the figure.

[0024] The hot nozzle structure 100 includes a hot nozzle body 110, a sealing ring 120, and a hot nozzle core structure 130. The needle valve hot runner system drives the valve needle to move upward through the piston. When the valve needle opens, plastic is injected into the main nozzle by the injection molding machine. It flows through the manifold, the valve needle sleeve, and the flow channel holes in the hot nozzle structure 100, and then through the intermediate flow channel in the hot nozzle core structure 130 at the front end of the hot nozzle structure 100, into the cavity of the fixed mold insert 200 to form a product.

[0025] This utility model provides a corrosion-resistant hot nozzle core structure 130, comprising: A beryllium copper pad 131, wherein a central channel 134 is provided inside the beryllium copper pad 131; The nozzle body 132 is made of stainless steel and has a guide channel 135 inside. The first end of the nozzle body 132 is connected to the beryllium copper pad 131 so that the central channel 134 and the guide channel 135 are connected to form an intermediate flow channel.

[0026] The corrosion-resistant hot nozzle core structure 130 provided by this utility model includes a beryllium copper pad 131 and a core body 132. A central channel 134 is provided within the beryllium copper pad 131. The core body 132 is made of stainless steel and has a guide channel 135. The first end of the core body 132 is connected to the beryllium copper pad 131, so that the central channel 134 and the guide channel 135 are connected to form an intermediate flow channel. This intermediate flow channel is connected to the flow channel within the hot nozzle body 110. When the injection signal is triggered, the valve needle is in the open state, and the adhesive... The material flows into the middle channel of the nozzle core structure through the flow channel holes in the hot nozzle body 110, that is, through the beryllium copper pad 131 and the stainless steel nozzle core body 132, and finally flows into the mold cavity to form the product. The beryllium copper pad 131 has good thermal conductivity and meets the thermal conductivity requirements. The nozzle core body 132 is designed to be made of stainless steel. Stainless steel has strong corrosion resistance and can withstand the corrosion of the nozzle core body 132 by flame retardant materials. It has better corrosion resistance, thereby extending the service life of the nozzle core structure, reducing the cost of parts, enabling mass production of flame retardant materials, meeting production requirements, and reducing the number of maintenance and costs.

[0027] It is understandable that the diameter of the connection between the central channel 134 in the beryllium copper pad 131 and the guide channel 135 in the nozzle body 132 is the same. After the central channel 134 and the guide channel 135 are connected, they form a complete intermediate flow channel. The valve needle can pass through the intermediate flow channel to open or block the intermediate flow channel, ensuring smooth glue injection.

[0028] It should be noted that the nozzle core body 132 is made of stainless steel, specifically S136 stainless steel with quenching and hardening, which has a hardness of 55~58HRC, higher than that of beryllium copper (36~44HRC), and stronger wear resistance. Stainless steel has relatively poor thermal conductivity, while beryllium copper has good thermal conductivity. The thermal conductivity of stainless steel is about 25w / m.k20℃, which is worse than that of beryllium copper (105w / m.k20℃). If the nozzle core structure is entirely made of stainless steel, the molten plastic will be stuck at the nozzle core due to the excessive cooling of the nozzle core structure, which can easily lead to the phenomenon of cold nozzle not dispensing. Therefore, the nozzle core body 132 is made of beryllium copper, taking advantage of its good thermal conductivity to meet production requirements.

[0029] In some embodiments of this utility model, a sealing colloid 133 is also included, which is disposed at the second end of the nozzle body 132 to wrap the end face of the second end of the nozzle body 132.

[0030] In some embodiments of the present invention described above, a sealing colloid 133 is provided at the second end of the nozzle core body 132. The sealing colloid 133 is used to wrap the end face of the second end of the nozzle core body 132. The sealing colloid 133 protects the end face of the second end of the nozzle core body 132, preventing the hot nozzle core structure 130 from failing to dispense adhesive and preventing abnormal adhesive feeding in the hot runner from affecting production.

[0031] In some embodiments of this utility model, the sealing colloid 133 uses a special engineering material (polyimide). This material has good elasticity and heat resistance, can withstand temperatures up to 350 degrees without decomposition, and will not crack at high temperatures, thereby avoiding the phenomenon of no glue being dispensed from the hot nozzle core structure 130 and avoiding abnormal glue inlet in the hot runner affecting production.

[0032] In some embodiments of this utility model, the second end of the nozzle body 132 and the sealing colloid 133 are connected by an inverted snap structure.

[0033] In some of the embodiments of this utility model described above, the second end of the nozzle body 132 and the sealing colloid 133 are connected by an inverted snap structure to ensure that the sealing colloid 133 and the second end of the nozzle body 132 have a good connection and to ensure that they will not fall off.

[0034] Specifically, the inverted structure includes an inverted groove 1321 and an inverted protrusion 1331. The inverted groove 1321 is disposed on one of the nozzle body 132 and the sealing colloid 133, and the inverted protrusion 1331 is disposed on the other of the nozzle body 132 and the sealing colloid 133. The inverted protrusion 1331 and the inverted groove 1321 cooperate with each other.

[0035] In this specific embodiment, the undercut groove 1321 and the undercut protrusion 1331 are detachably connected. The undercut groove 1321 and the undercut protrusion 1331 cooperate to achieve a better connection and ensure that they will not fall off.

[0036] More specifically, the second end of the nozzle body 132 is provided with an undercut groove 1321, and the sealing colloid 133 is provided with an undercut protrusion 1331, the undercut protrusion 1331 and the undercut groove 1321 cooperate with each other.

[0037] In some embodiments of this utility model, the guide channel 135 includes an upper channel 1351, a middle channel 1352 and a lower channel 1353, the middle channel 1352 is connected between the upper channel 1351 and the lower channel 1353, and the upper channel 1351 is connected to the central channel 134.

[0038] In some embodiments of the present invention described above, the guide channel 135 includes an upper channel 1351, a middle channel 1352, and a lower channel 1353. The upper channel 1351 is connected to the central channel 134. The diameter of the connection end between the upper channel 1351 and the central channel 134 is the same as the diameter of the central channel 134. When the valve needle moves to the lower channel 1353, it can block the lower channel 1353 and terminate the glue injection.

[0039] In some embodiments of this utility model, the intermediate channel 1352 is a conical structure, with the large-diameter end of the conical structure connected to the upper channel 1351 and the small-diameter end of the conical structure connected to the lower channel 1353.

[0040] In some embodiments of the present invention described above, the intermediate channel 1352 is a conical structure. The large-diameter end of the conical structure is connected to the upper channel 1351, and the small-diameter end of the conical structure is connected to the lower channel 1353. The intermediate channel 1352 of the conical structure can increase the thickness of the bottom of the stainless steel nozzle body 132, increase the strength of the stainless steel nozzle body 132, improve the service life of the stainless steel nozzle body 132, further reduce the phenomenon of non-adhesive dispensing, and ensure normal production.

[0041] In some embodiments of this utility model, the inner surface of the beryllium copper pad 131 is chrome plated.

[0042] In some of the embodiments of this utility model described above, the inner surface of the beryllium copper pad 131 is chrome-plated, which reduces the abnormality of product contamination caused by corrosion of the inner surface of the nozzle body 132, thereby improving the product qualification rate.

[0043] This utility model also provides a hot runner system, including a hot nozzle body 110, a sealing ring 120, and a corrosion-resistant hot nozzle core structure 130 as described above. The sealing ring 120 sequentially fastens the beryllium copper pad 131 and the nozzle core body 132 onto the hot nozzle body 110.

[0044] The present invention also provides a hot runner system, including a hot nozzle body 110, a sealing ring 120, and a corrosion-resistant hot nozzle core structure 130 as described above. The sealing ring 120 can sequentially fasten the beryllium copper pad 131 and the core body 132 to the hot nozzle body 110, thereby ensuring that the flow channel hole in the hot nozzle body 110, the central channel 134 of the beryllium copper pad 131, and the guide channel 135 in the core body 132 are connected to form an intermediate flow channel, and the valve core reciprocates within the intermediate flow channel.

[0045] Specifically, the hot nozzle body 110 has a countersunk hole with threads below it. A beryllium copper washer 131 is disposed within the countersunk hole. The upper outer diameter of the stainless steel nozzle core body 132 is the same as that of the beryllium copper washer 131. The stainless steel nozzle core body 132 and the beryllium copper washer 131 are disposed within the countersunk hole. The lower outer diameter of the stainless steel nozzle core body 132 is smaller than that of the upper outer diameter, forming an annular boss. The sealing ring 120 has threads and is connected to the threads, thereby abutting the stainless steel nozzle core body 132 and the beryllium copper washer 131 within the hot nozzle body 110. This ensures the positioning accuracy of the beryllium copper washer 131 and the stainless steel nozzle core body 132, and connects the flow channel hole in the hot nozzle body 110, the central channel 134 of the beryllium copper washer 131, and the guide channel 135 in the nozzle core body 132 to form a complete intermediate flow channel.

[0046] In some embodiments of this utility model, a fixed mold insert 200 is also included, and the sealing colloid 133 is disposed between the nozzle core body 132 and the fixed mold insert 200.

[0047] In some embodiments of the present invention described above, the sealing colloid 133 wraps around the end face of the second end of the nozzle body 132, protecting the end face of the second end of the nozzle body 132. When the hot nozzle body 110 is placed on the electric motor insert, the sealing colloid 133 is placed between the nozzle body 132 and the fixed mold insert 200, ensuring that the flame-retardant fuel will not overflow between the fixed mold insert 200 and the nozzle body 132, and ensuring that the outer side of the stainless steel nozzle body 132 is not easily corroded.

[0048] Example 1:

[0049] The hot runner system provided by this utility model includes a fixed mold insert 200 and a hot nozzle structure 100. The hot nozzle structure 100 is installed on the fixed mold insert 200. The hot nozzle structure 100 includes a hot nozzle body 110, a sealing ring 120 and a corrosion-resistant hot nozzle core structure 130. The sealing ring 120 can install the corrosion-resistant hot nozzle core structure 130 on the hot nozzle body 110.

[0050] Furthermore, the corrosion-resistant hot nozzle core structure 130 includes a beryllium copper pad 131, a nozzle core body 132, and a sealing colloid 133. The beryllium copper pad 131 has a central channel 134, and the inner surface of the beryllium copper pad 131 is chrome-plated. The nozzle body 132 is made of stainless steel. A guide channel 135 is provided inside the nozzle body 132. The first end of the nozzle body 132 is connected to the beryllium copper pad 131 so that the central channel 134 and the guide channel 135 are connected to form an intermediate flow channel. The sealing colloid 133 is made of polyimide and is disposed at the second end of the nozzle body 132 to wrap the end face of the second end of the nozzle body 132. After the hot nozzle structure 100 is installed on the fixed mold insert 200, the sealing colloid 133 is disposed between the nozzle body 132 and the fixed mold insert 200.

[0051] Furthermore, the second end of the nozzle body 132 and the sealing colloid 133 are connected by an undercut structure; the undercut structure includes an undercut groove 1321 and an undercut protrusion 1331, the undercut groove 1321 is disposed on the nozzle body 132, the undercut protrusion 1331 is disposed on the sealing colloid 133, and the undercut protrusion 1331 and the undercut groove 1321 cooperate with each other.

[0052] Furthermore, the guide channel 135 includes an upper channel 1351, a middle channel 1352, and a lower channel 1353. The middle channel 1352 connects the upper channel 1351 and the lower channel 1353. The upper channel 1351 is connected to the central channel 134. The upper channel 1351 and the central channel 134 have the same diameter. The middle channel 1352 has a tapered structure. The larger diameter end of the tapered structure is connected to the upper channel 1351, and the smaller diameter end of the tapered structure is connected to the lower channel 1353.

[0053] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A corrosion-resistant hot nozzle core structure, characterized in that, include: A beryllium copper pad, wherein a central channel is provided inside the beryllium copper pad; The nozzle body is made of stainless steel and has a guide channel inside. The first end of the nozzle body is connected to the beryllium copper pad so that the central channel and the guide channel are connected to form an intermediate flow channel.

2. The corrosion-resistant hot nozzle core structure according to claim 1, characterized in that, It also includes a sealing compound disposed at the second end of the nozzle body to wrap the end face of the second end of the nozzle body.

3. The corrosion-resistant hot nozzle core structure according to claim 2, characterized in that, The second end of the nozzle core body and the sealing colloid are connected by an inverted snap structure; And / or, the undercut structure includes an undercut groove and an undercut protrusion, the undercut groove being disposed on one of the nozzle body and the sealing compound, the undercut protrusion being disposed on the other of the nozzle body and the sealing compound, and the undercut protrusion and the undercut groove cooperating with each other.

4. The corrosion-resistant hot nozzle core structure according to claim 2, characterized in that, The sealing colloid is made of polyimide.

5. The corrosion-resistant hot nozzle core structure according to claim 2, characterized in that, The guide channel includes an upper channel, a middle channel, and a lower channel. The middle channel connects the upper channel and the lower channel, and the upper channel is connected to the central channel.

6. The corrosion-resistant hot nozzle core structure according to claim 5, characterized in that, The middle channel has a conical structure, with the larger diameter end of the conical structure connected to the upper channel and the smaller diameter end of the conical structure connected to the lower channel.

7. The corrosion-resistant hot nozzle core structure according to claim 5, characterized in that, The upper channel and the central channel have the same diameter.

8. The corrosion-resistant hot nozzle core structure according to claim 2, characterized in that, The inner surface of the beryllium copper pad is chrome plated.

9. A hot runner system, characterized in that, It includes a hot nozzle body, a sealing ring, and a corrosion-resistant hot nozzle core structure as described in any one of claims 2-8, wherein the sealing ring sequentially fastens the beryllium copper pad and the core body to the hot nozzle body.

10. The hot runner system according to claim 9, characterized in that, It also includes a fixed mold insert, wherein the sealing colloid is disposed between the nozzle core body and the fixed mold insert.

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