Hot nozzle structure suitable for high-temperature materials

Abstract

The utility model relates to a hot nozzle structure suitable for high-temperature materials, which comprises a hot nozzle body and a feeding nozzle connected to the end part of the hot nozzle body, the feeding nozzle comprises a heating groove arranged on the outer side surface and a heating wire arranged in the heating groove, the heating groove is provided with a plurality of inflection points, and the inflection points are arranged on the outer side surface of the feeding nozzle. Inflection points are arranged on the hot nozzle body, a plurality of U-shaped parts are formed through the inflection points, a metal sleeve heater is arranged on the hot nozzle body, the metal sleeve heater is arranged at the end, close to the feeding nozzle, of the hot nozzle body in a sleeving mode, and a first heating part is installed on one side of the metal sleeve heater. The hot nozzle can effectively guarantee that the temperature of materials in the hot nozzle is uniform, can be better suitable for injection molding of high-temperature materials, improves the phenomena of gas marks and material flowers on the appearance of a product, and meanwhile can effectively prevent the problems that glue cannot be discharged and a valve needle is blocked due to the too low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner injection molding, and particularly relates to a nozzle structure suitable for high-temperature materials. Background Art

[0002] When the existing ordinary single-point needle valve type nozzle is used for injection molding, the material enters through the feed nozzle at the top, flows through the nozzle body and then flows out from the gate at the bottom to the mold. Generally, a heater is provided at the lower part of the nozzle body to heat the material flowing inside. However, when injecting some high-temperature materials (such as PA66+glass fiber, PBT+glass fiber, PPSU, PPS, PPA, etc.), since it is necessary to always maintain a very high temperature, there is a relatively long unheated section in the upper part of the existing nozzle (that is, the feed nozzle and the top part of the nozzle body), which easily causes the temperature of the high-temperature material entering the nozzle to be uneven (the upper and lower temperatures are high, and the middle temperature is low), resulting in phenomena such as air streaks and material flowers on the appearance of the injection-molded product, and it cannot meet the production of some products with high appearance requirements, seriously affecting the quality of the product. Secondly, the relatively low temperature in the middle of the nozzle may also cause a certain degree of curing of the material, resulting in problems such as inability to discharge glue and needle valve jamming, affecting the normal progress of injection molding. Summary of the Utility Model

[0003] In view of this, in order to solve the above problems in the prior art, the utility model provides a nozzle structure suitable for high-temperature materials.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A nozzle structure suitable for high-temperature materials includes a nozzle body and a feed nozzle connected to the end of the nozzle body. The feed nozzle includes a heating groove provided on the outer surface and a heating wire installed in the heating groove. The heating groove has a plurality of inflection points, and a plurality of U-shaped parts are formed through the inflection points. A metal sleeve heater is provided on the nozzle body, and the metal sleeve heater is sleeved on one end of the nozzle body close to the feed nozzle. A first heating part is installed on one side of the metal sleeve heater.

[0006] In the above technical solution, a hot nozzle structure is provided for injection molding of a hot runner mold. It includes a hot nozzle body and a feed nozzle installed on the top of the hot nozzle body. The material enters the hot nozzle body through the feed nozzle and finally flows out from the gate at the bottom of the hot nozzle body to complete the injection molding work. A heating groove is provided on the outer surface of the feed nozzle, and a heating wire is embedded in the heating groove. The material entering the feed nozzle can be heated by the heating wire. And by setting the heating groove, without changing the size of the feed nozzle and the mold size, the heating wire can be closer to the material inside the feed nozzle, so that the center of the material can also be fully heated to ensure uniform material temperature. Among them, the heating groove forms a plurality of connected U-shaped parts through a plurality of inflection points, which can increase the length of the heating wire and increase the contact area between the heating wire and the feed nozzle, thereby improving the heating effect. In addition, a metal sleeve heater is sleeved on the top of the hot nozzle body. The first heating part is connected to the heating wire of the hot runner system to generate heat in the metal sleeve heater. The metal sleeve heater can heat the upper part of the hot nozzle body, and the sleeved heating method does not require changing the structural shape of the hot nozzle body. Through the continuously arranged heating wire and metal sleeve heater, the interval where the material is not heated can be effectively shortened, ensuring uniform material temperature throughout the process, being better applicable to the injection molding of high-temperature materials, effectively improving the appearance air streaks and material flowers of the injection molded products. At the same time, it can also avoid problems such as the material inside the hot nozzle body solidifying due to low temperature, resulting in no glue output and valve needle jamming.

[0007] As a further solution of the present application, a body heater is sleeved on the hot nozzle body, and the body heater is arranged on the side of the metal sleeve heater away from the feed nozzle.

[0008] In the above technical solution, the body heater is located below the metal sleeve heater and is used to heat the lower part of the hot nozzle body to keep the material at a suitable temperature before entering the mold. Through the continuously arranged heating wire, metal sleeve heater and body heater, it effectively ensures uniform material temperature throughout the process and meets the injection molding of high-temperature materials.

[0009] As a further solution of the present application, a second heating part is installed on one side of the body heater.

[0010] In the above technical solution, the second heating part is used to be connected to the heating wire of the hot runner system so that the body heater can generate heat for heating work.

[0011] As a further solution of the present application, the hot nozzle body includes a valve needle, a gate bushing and a nozzle core. A material flow channel is provided inside the hot nozzle body. The valve needle is inserted and installed in the material flow channel. The nozzle core is installed at the end inside the material flow channel, and the gate bushing is sleeved on the outside of the nozzle core.

[0012] In the above technical solution, the nozzle core is installed in the material flow channel and is located at the bottom of the material flow channel. A channel for the material to pass through is opened inside it. After the material passes through the nozzle core, it flows out from the gate at the bottom of the hot nozzle body. The gate bushing is sleeved outside the nozzle core to play a role in heat insulation and pressure bearing, ensuring the normal progress of injection molding. The valve pin is inserted into the material flow channel and controls the opening and closing of the gate of the hot nozzle body by moving up and down.

[0013] As a further solution of the present application, the feeding nozzle is provided with a driving groove, the driving groove penetrates the side surface of the feeding nozzle, and one end of the valve pin is arranged in the driving groove.

[0014] In the above technical solution, after the valve pin is inserted into the material flow channel, its top end extends out of the hot nozzle body and is located in the driving groove. The driving groove is used to connect the external driving device with the top end of the valve pin, so as to control the up and down movement of the valve pin to realize the opening and closing of the gate.

[0015] As a further solution of the present application, a positioning block is installed in the material flow channel, and the positioning block is provided with a positioning hole matching with the valve pin.

[0016] In the above technical solution, the positioning block is used to guide and position the valve pin, prevent the valve pin from shifting, and ensure its normal function of opening and closing.

[0017] As a further solution of the present application, a feeding port is opened at the top of the feeding nozzle, a first feeding channel connected to the feeding port is arranged inside the feeding nozzle, a second feeding channel communicating with the material flow channel is arranged inside the hot nozzle body, and the first feeding channel is communicated with the second feeding channel.

[0018] In the above technical solution, during injection molding, the material sequentially passes through the feeding port, the first feeding channel, the second feeding channel and the material flow channel, and then flows out from the gate at the bottom of the hot nozzle body.

[0019] As a further solution of the present application, both the first feeding channel and the second feeding channel are inclined to the axis of the material flow channel.

[0020] In the above technical solution, the first feeding channel and the second feeding channel are inclined to make way for the valve pin at the central position of the hot nozzle body, and at the same time, the material can be closer to the external heating wire to enhance the heating effect.

[0021] As a further solution of the present application, a plurality of connecting holes are arranged at the end of the feeding nozzle.

[0022] In the above technical solution, the connecting holes are used to connect and fix the feeding nozzle with the structure of the external hot runner system.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] In the present application, by means of the heating wires and the metal sleeve heaters arranged continuously up and down, the interval where the material is not heated can be effectively shortened, the temperature of the material can be ensured to be uniform throughout the process, and the temperature of the material can be controlled to be appropriate, which can be better applied to the injection molding of high-temperature materials, effectively improving phenomena such as air streaks and material flowers on the appearance of injection molded products. At the same time, it can also avoid the phenomena of inability to discharge glue and valve needle jamming caused by the low temperature of the material inside the hot nozzle body. In addition, by arranging a heating groove for installing the heating wire on the feed nozzle, without changing the size of the feed nozzle and the mold, the heating wire can be closer to the material inside the feed nozzle, so that the center of the material can also be fully heated, ensuring uniform material temperature. Moreover, the heating groove is formed with multiple connected U-shaped parts through multiple inflection points, which can increase the length of the heating wire and the contact area between the heating wire and the feed nozzle, effectively improving the heating effect. The overall structure is simple and easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a perspective view of the hot nozzle structure of an embodiment.

[0027] Figure 2 It is a front view of the hot nozzle structure of the present application.

[0028] Figure 3 It is an exploded schematic view of the hot nozzle structure of the present application.

[0029] Figure 4 It is a top view of the hot nozzle structure of the present application.

[0030] Figure 5 It is Figure 4 a cross-sectional view at the A-A position in

[0031] Explanation of the reference numerals in the drawings:

[0032] 1 - hot nozzle body; 11 - second feed channel; 12 - material flow channel; 121 - positioning block; 13 - valve needle; 14 - nozzle core; 15 - gate bushing; 2 - feed nozzle; 21 - heating groove; 22 - drive groove; 23 - feed port; 24 - first feed channel; 25 - connection hole; 3 - metal sleeve heater; 31 - first heating part; 4 - body heater; 41 - second heating part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. The components of the embodiments of this application usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] Please refer to Figures 1 to 3 , in a preferred embodiment, a nozzle structure suitable for high-temperature materials is provided for injection molding of a hot runner mold. It includes a nozzle body 1 and a feed nozzle 2 connected to the top of the nozzle body 1. A heating groove 21 is provided on the outer surface of the feed nozzle 2. The heating groove 21 has a plurality of inflection points and forms a plurality of U-shaped parts through the plurality of inflection points. The U-shaped parts are in a vertical or horizontal state. A heating wire (the heating wire in the figure is in a removed state and is not specifically shown) is inlaid and installed in the heating groove 21. A metal sleeve heater 3 is sleeved on the upper part of the nozzle body 1, and a body heater 4 is sleeved on the lower part. A first heating part 31 is installed on the side of the metal sleeve heater 3, and a second heating part 41 is installed on the side of the body heater 4. Both the first heating part 31 and the second heating part 41 are connected to the heating wire of the hot runner system, so that the metal sleeve heater 3 and the body heater 4 can generate heat.

[0037] Specifically, during injection molding, the material first passes through the feed nozzle 2, then enters the nozzle body 1, and finally flows out from the gate at the bottom of the nozzle body 1. After the material enters the feed nozzle 2, the heating wire in the heating groove 21 can heat the material. Then, when the material reaches the upper part of the nozzle body 1, the metal sleeve heater 3 heats and keeps the temperature of the material here. After the material reaches the lower part of the nozzle body 1, it is heated by the body heater. By continuously arranging the heating wire, the metal sleeve heater 3 and the body heater 4, the temperature of the material is effectively guaranteed to be uniform throughout the process, thereby shortening the interval where the material is not heated, ensuring that the temperature of the material is uniform throughout the process, being better suitable for the injection molding work of high-temperature materials, effectively improving phenomena such as air streaks and material flowers on the appearance of the injection molded product. At the same time, it can also prevent the material inside the nozzle body 1 from solidifying due to low temperature, resulting in the valve needle 13 being stuck.

[0038] Among them, by setting the heating groove 21 to embed the heating wire, the heating wire is closer to the material inside the feed nozzle 2, so that the center of the material can also be fully heated, controlling the material temperature evenly, and without changing the size of the feed nozzle 2 and the mold size, which is more convenient to use. Among them, the heating groove 21 forms a plurality of connected U-shaped parts through a plurality of inflection points, so as to increase the length of the heating wire and increase the contact area between the heating wire and the feed nozzle 2, thereby improving the heating effect.

[0039] Preferably, the metal sleeve heater 3 in this embodiment is a copper sleeve heater, which has good heating performance and heat preservation effect.

[0040] Please refer to Figures 3 to 5 , in some embodiments, the hot nozzle body 1 includes a valve pin 13, a sprue bushing 15 and a nozzle core 14. A material flow channel 12 is provided inside the hot nozzle body 1. The valve pin 13 is inserted into the material flow channel 12 and controls the gate switch of the hot nozzle body 1 by moving up and down. The nozzle core 14 is installed at the bottom of the material flow channel 12, and the material flows out from the bottom gate after passing through the nozzle core 14. The sprue bushing 15 is sleeved outside the nozzle core 14 to play a role in heat insulation and pressure bearing, ensuring the normal progress of injection molding.

[0041] Please refer to Figures 3 to Figure 5 , in some embodiments, a feed port 23 is opened at the top of the feed nozzle 2. A first feed channel 24 connected to the feed port 23 is provided inside the feed nozzle 2. A second feed channel 11 communicating with the material flow channel 12 is provided inside the hot nozzle body 1. The first feed channel 24 is communicated with the second feed channel 11. During injection molding, the material passes through the feed port 23, the first feed channel 24, the second feed channel 11 and the material flow channel 12 in sequence, and then flows out from the gate at the bottom of the hot nozzle body 1. Both the first feed channel 24 and the second feed channel 11 are inclined to the axis of the material flow channel 12 to make way for the valve pin 13, and at the same time, the material can be closer to the external heating wire, strengthening the heating effect.

[0042] Specifically, two first feed channels 24 are provided. Correspondingly, two second feed channels 11 are also provided correspondingly. The first feed channel 24 and the second feed channel 11 are symmetric about the axis of the material flow channel 12. The number of the first feed channel 24 and the second feed channel 11 can be adjusted according to actual needs.

[0043] Please refer to Figures 1 to 3 , in some embodiments, the feed nozzle 2 is provided with a driving groove 22, and the driving groove 22 penetrates from the side of the feed nozzle 2. After the valve pin 13 is inserted into the material flow channel 12, the top part of it extends out of the hot nozzle body 1 and is located in the driving groove 22. The output end of the driving device (such as a cylinder) of the hot runner system is connected to the top of the valve pin 13 through the driving groove 22 to drive the valve pin 13 to move up and down to realize the opening and closing of the gate.

[0044] Preferably, please refer to Figure 3 , a protruding ring is provided at the top end of the valve needle 13, which is convenient for connecting with the output end of the driving device.

[0045] Please refer to Figures 3 to 5 , in some embodiments, a positioning block 121 is installed in the material flow channel 12. The positioning block 121 is provided with a positioning hole that cooperates with the valve needle 13 to guide and position the valve needle 13, prevent the valve needle 13 from shifting, and ensure its normal switching function.

[0046] Please refer to Figure 4 , in some embodiments, the end of the feed nozzle 2 is provided with four connection holes 25. The connection holes 25 are used to connect and fix the feed nozzle 2 to the external hot runner system structure, and the number of the connection holes 25 is adjusted according to the actual situation.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0048] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0050] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A hot nozzle structure applicable to high-temperature materials, comprising a hot nozzle body and a feed nozzle connected to the end of the hot nozzle body, characterized in that, The feed nozzle includes a heating groove provided on the outer surface and a heating wire installed in the heating groove. The heating groove is provided with a plurality of inflection points, and a plurality of U-shaped parts are formed through the inflection points. A metal sleeve heater is provided on the hot nozzle body, and the metal sleeve heater is sleeved on one end of the hot nozzle body close to the feed nozzle. A first heating part is installed on one side of the metal sleeve heater.

2. The hot nozzle structure applicable to high-temperature materials according to claim 1, characterized in that, A body heater is sleeved on the hot nozzle body, and the body heater is provided on the side of the metal sleeve heater away from the feed nozzle.

3. The hot nozzle structure applicable to high-temperature materials according to claim 2, characterized in that, A second heating part is installed on one side of the body heater.

4. The hot nozzle structure applicable to high-temperature materials according to claim 1, characterized in that The hot nozzle body includes a valve pin, a sprue bushing and a nozzle core. A material flow channel is provided inside the hot nozzle body. The valve pin is inserted and installed in the material flow channel. The nozzle core is installed at the end of the material flow channel, and the sprue bushing is sleeved on the outside of the nozzle core.

5. The hot nozzle structure applicable to high-temperature materials according to claim 4, characterized in that, The feed nozzle is provided with a driving groove, the driving groove penetrates through the side surface of the feed nozzle, and one end of the valve pin is arranged in the driving groove.

6. The hot nozzle structure applicable to high-temperature materials according to claim 5, characterized in that, A positioning block is installed in the material flow channel, and the positioning block is provided with a positioning hole that cooperates with the valve pin.

7. The hot nozzle structure applicable to high-temperature materials according to claim 4, characterized in that, The top of the feed nozzle is provided with a feed port. A first feed channel connected to the feed port is provided inside the feed nozzle. A second feed channel communicated with the material flow channel is provided inside the hot nozzle body, and the first feed channel is communicated with the second feed channel.

8. The hot nozzle structure applicable to high-temperature materials according to claim 7, characterized in that, Both the first feed channel and the second feed channel are inclined to the axis of the material flow channel.

9. The hot nozzle structure applicable to high-temperature materials according to claim 1, characterized in that, The end of the feed nozzle is provided with a plurality of connection holes.

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