Tip heating structure and hot tip, hot runner system thereof

Abstract

The present application belongs to hot runner technical field, especially relate to nozzle tip heating structure and its hot nozzle, hot runner system. A nozzle tip heating structure, including nozzle tip body, the nozzle tip body is equipped with nozzle tip runner, the nozzle tip body outer wall surface is equipped with nozzle tip heating wire outlet slot I.

Description

Technical Field

[0001] This invention belongs to the field of hot runner technology, and in particular relates to a nozzle tip heating structure and its hot nozzle and hot runner system. Background Technology

[0002] Hot runner systems maintain the molten plastic in the runner and gate by heating. Because heating rods and coils are located near or in the center of the runner, the entire runner from the injection molding machine nozzle to the gate is kept at a high temperature, keeping the plastic molten. After shutdown, there is no need to open the runner to remove the solidified material; upon restarting, the runner only needs to be heated to the required temperature. Hot runner technology offers advantages such as saving raw materials, reducing costs, shortening molding cycles, improving machine efficiency, improving the surface quality and mechanical properties of molded products, and enhancing the aesthetics of the molded product surface. However, with the widespread application of hot runner technology, various defects have also appeared to varying degrees in some high-quality plastic parts applications. Furthermore, with the diversification of products, the structural requirements for hot runners are increasing, and customers hope to maximize the advantages of hot runners while achieving maximum profit.

[0003] Conventional hot runner heating systems typically have the heater mounted externally on the nozzle body, while the nozzle tip and pressure cap are installed internally, with the protruding parts not heated. Because various materials have different injection molding characteristics and processes, their temperature requirements also differ. For materials like super engineering plastics and nylon reinforced with glass fiber, injection molding is more difficult. These materials have higher temperature requirements, and sometimes temperature imbalances can lead to various problems such as cold material and wear. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a method for more precise control of the gate end temperature by embedding an independent heating wire on the nozzle tip to optimize the temperature balance of the nozzle tip. This method is applied to hot nozzle and hot runner systems to improve the molding stability and production efficiency of products, while also improving product quality.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A nozzle tip heating structure includes a nozzle tip body, a nozzle tip flow channel is provided inside the nozzle tip body, a nozzle tip heating wire is circumferentially wound on the outer wall surface of the nozzle tip body, and a nozzle tip heating wire outlet groove I is provided on the outer wall surface of the nozzle tip body.

[0007] Furthermore, the outer wall surface of the nozzle body is provided with an embedded groove for embedding the nozzle heating wire.

[0008] Furthermore, an anti-rotation outlet groove sleeve is fixed on the outer wall surface of the nozzle body near the nozzle tip heating wire outlet groove I. The anti-rotation outlet groove sleeve includes a nozzle tip heating wire outlet groove II and an anti-rotation protrusion. The nozzle tip heating wire outlet groove II is aligned and connected with the nozzle tip heating wire outlet groove I.

[0009] Furthermore, the dispensing end of the nozzle body is provided with a heat-insulating cap groove.

[0010] Furthermore, one end of the tip heating wire is installed in the embedded groove below the tip body, and the other end of the tip heating wire is continuously wound into the embedded groove above the tip body. The other end of the tip heating wire passes through tip heating wire outlet groove I and tip heating wire outlet groove II.

[0011] A hot nozzle includes a hot nozzle body, a hot nozzle flow channel is provided in the hot nozzle body, a tip mounting groove is provided at the bottom of the hot nozzle body, an elongated anti-rotation protrusion groove is vertically formed on the inner wall of the tip mounting groove, a tip heating wire outlet hole is formed on the inner wall of the tip mounting groove above the anti-rotation protrusion groove, and the tip heating wire outlet hole is connected to the tip heating wire outlet groove III formed in the hot nozzle body.

[0012] A tip heating structure is installed in the tip mounting slot.

[0013] Furthermore, the nozzle tip body and the anti-rotation cable groove sleeve are installed in the nozzle tip mounting groove;

[0014] The anti-rotation protrusion is installed in the anti-rotation protrusion groove;

[0015] The nozzle tip channel is connected to the hot nozzle channel and is equipped with a valve needle;

[0016] A tip cap is installed between the tip body and the tip mounting groove;

[0017] A nozzle tip body reinforcement sleeve is installed on the outer wall of the hot nozzle body near the anti-rotation protrusion groove.

[0018] A heat-insulating cap is installed inside the heat-insulating cap groove;

[0019] Heating elements are installed on the outer wall of the heating nozzle body.

[0020] Furthermore, the other end of the heating wire that passes through the tip heating wire outlet groove I and tip heating wire outlet groove II passes through the tip heating wire outlet hole and tip heating wire outlet groove III and exits outside the hot nozzle body.

[0021] A hot runner system comprising a hot nozzle as described in any of the preceding claims.

[0022] Compared with existing technologies, the advantages of this invention are as follows: A separate set of heating wires is added to the nozzle tip, optimizing the temperature balance of the nozzle tip area to improve product molding stability and production efficiency, while also improving product quality. It can meet the high temperature balance requirements of transparent materials and super engineering materials at the gate end. The heating wires on the nozzle tip can independently control the temperature of the nozzle tip area, creating two independent heating zones with the heating elements on the hot nozzle, allowing for more accurate temperature control of the material entering the gate and improving temperature balance.

[0023] After adding a heating wire to the nozzle tip, the question arises regarding the wire routing and the fabrication and installation of various components. While ensuring improved temperature balance, the nozzle structure is optimized, and the manufacturing process is simplified. The innovation lies in replacing the conventional external sleeve or embedded heater with an internal nozzle tip embedded heater, machining the nozzle tip separately, and optimizing temperature balance at the tip to improve product molding stability and production efficiency, while simultaneously enhancing product quality. This structure minimizes mold losses and the impact of mold cooling water on resin temperature, and uses a heat insulation ring to improve insulation, optimizing the balance of resin temperature control. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the tip structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the anti-rotation cable slot pressure sleeve structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the hot nozzle structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 A schematic diagram of the AA-direction view structure;

[0028] Figure 5 This is a schematic diagram of the hot nozzle assembly tip structure of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the exploded structure;

[0030] Figure 7 This is a schematic diagram of the tip cap structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the hot runner system structure for the hot nozzle used in this invention. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] like Figure 1 , 2 As shown:

[0034] A tip heating structure includes a tip body 1, a tip flow channel 15 inside the tip body 1, a tip heating wire 11 circumferentially wound on the outer wall of the tip body 1, and a tip heating wire outlet groove I 12 on the outer wall of the tip body 1.

[0035] The outer wall surface of the nozzle body 1 is provided with an embedded groove 14 for embedding the nozzle heating wire 11.

[0036] An anti-rotation wire outlet groove pressure sleeve 2 is fixed on the outer wall of the tip body 1 near the tip heating wire outlet groove I12. The anti-rotation wire outlet groove pressure sleeve 2 includes a tip heating wire outlet groove II21 and an anti-rotation protrusion 22. The tip heating wire outlet groove II21 is aligned and connected with the tip heating wire outlet groove I12.

[0037] The nozzle body 1 has a heat insulation cap groove 13 at the glue dispensing end.

[0038] One end of the tip heating wire 11 is installed in the embedded groove 14 below the tip body 1, and the other end of the tip heating wire 11 is continuously wound into the embedded groove 14 above the tip body 1. The other end of the tip heating wire 11 passes through the tip heating wire outlet groove I 12 and the tip heating wire outlet groove II 21.

[0039] like Figure 3 , 4 As shown in Figures 5 and 6:

[0040] A heating nozzle includes a heating nozzle body 3, a heating nozzle flow channel 35 inside the heating nozzle body 3, a nozzle tip mounting groove 31 below the heating nozzle body 3, an elongated anti-rotation protruding groove 32 vertically formed on the inner wall of the nozzle tip mounting groove 31, a nozzle tip heating wire outlet hole 33 formed above the anti-rotation protruding groove 32 on the inner wall of the nozzle tip mounting groove 31, and the nozzle tip heating wire outlet hole 33 is connected to a nozzle tip heating wire outlet groove Ⅲ34 formed in the heating nozzle body 3; a nozzle tip heating structure is installed in the nozzle tip mounting groove 31.

[0041] The nozzle tip body 1 and the anti-rotation cable groove sleeve 2 are installed in the nozzle tip mounting groove 31; the anti-rotation protrusion 22 is installed in the anti-rotation protrusion groove 32; the nozzle tip flow channel 15 is connected to the hot nozzle flow channel 35 and is equipped with a valve needle 6; a nozzle tip pressure cap 4 is installed between the nozzle tip body 1 and the nozzle tip mounting groove 31; a nozzle tip body reinforcing sleeve 5 is installed on the outer wall of the hot nozzle body 3 near the anti-rotation protrusion groove 32; a heat insulation cap 7 is installed in the heat insulation cap groove 13; and a heating element 8 is installed on the outer wall of the hot nozzle body 3.

[0042] The other end of the heating wire 11, which passes through the heating wire outlet groove I12 and the heating wire outlet groove II21, passes through the heating wire outlet hole 33 and the heating wire outlet groove III34 and exits outside the heating nozzle body 3.

[0043] like Figure 8 As shown:

[0044] A hot runner system comprising a hot nozzle as described above.

[0045] Reference Figure 1-8 As shown:

[0046] Installation and use of nozzle tip, hot nozzle and hot runner system: Injection nozzle 9, manifold 10, center pin and commonly used manifold heating wire, thermocouple, anti-rotation pin, etc. are all conventional structures, processed according to conventional processing methods, and the processing technology and sequence remain unchanged.

[0047] First, install and fix the tip heating wire 11 and thermocouple (the thermocouple is a conventional device and is not shown in the figure) on the tip body 1. Then, install the anti-rotation wire outlet sleeve 2 on the tip body 1, align the tip heating wire outlet slot I 12 with the tip heating wire outlet slot II 21, and let the tip heating wire 11 and thermocouple exit from the tip heating wire outlet slot I 12 aligned with the tip heating wire outlet slot II 21. Then, use tools to fix the tip body 1 and the anti-rotation wire outlet sleeve 2 together and weld them together.

[0048] The second step is to install the assembled and welded tip into the tip mounting groove 31 of the hot nozzle body 3. First, the heating wire 11 and the thermocouple (the thermocouple is a conventional device and is not shown in the figure) are inserted into the tip heating wire outlet hole 33 of the hot nozzle body 3 and exited through the tip heating wire outlet groove Ⅲ 34. The anti-rotation protrusion 22 is used as a guide to install it into the anti-rotation protrusion groove 32 provided in the hot nozzle body 3. Then, the tip cap 4 is installed. The tip cap 4 has an external thread 41 that matches and is fixed with the internal thread 36 provided in the tip mounting groove 31. The positioning surface Ⅰ 42 of the tip cap 4 is positioned and engaged with the positioning surface Ⅱ 37 provided in the tip mounting groove 31.

[0049] The third step is to install the external heating element 8, thermocouple, and related retaining ring accessories.

[0050] Fourth step, install the valve needle 6 and heat insulation cap 7 onto the hot nozzle; finally, install the nozzle tip reinforcement sleeve 5.

[0051] Installed on the hot runner body 3, it prevents cracking at the thin-walled position of the anti-rotation protrusion groove 32 on the hot runner body 3. Then, following the standard procedure, assemble the system components such as the manifold, hot runner, injection nozzle, center pin, screws, and anti-rotation pin. The entire hot runner system can then be installed in the pre-machined mold.

[0052] The hot runner system mainly relies on the structural design and coordination of the nozzle tip and the hot runner. The injection molding process is a standard procedure. The rubber material sequentially passes through the injection nozzle 9, the manifold 10, the hot runner body 3, and the nozzle tip body 1. The downward movement of the valve needle 6 seals the material, while the upward movement completes the entire injection molding process. A temperature control box individually regulates the temperature of the external heating element 8 of the hot runner body 3 and the nozzle tip heating wire 11 embedded in the nozzle tip body 1, ensuring a more balanced temperature of the rubber material at the nozzle head.

[0053] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or variations to the present invention without departing from the technical concept of the present invention, and such modifications or variations naturally fall within the protection scope of the present invention.

Claims

1. A nozzle tip heating structure, characterized in that: Includes a nozzle body (1), a nozzle flow channel (15) is provided inside the nozzle body (1), a nozzle heating wire (11) is wound around the outer wall of the nozzle body (1) in a circumferential direction, and a nozzle heating wire outlet groove I (12) is provided on the outer wall of the nozzle body (1). The outer wall surface of the nozzle body (1) is provided with an embedded groove (14) for embedding the nozzle heating wire (11). The outer wall of the tip body (1) is fixed with an anti-rotation outlet groove sleeve (2) near the tip heating wire outlet groove I (12). The anti-rotation outlet groove sleeve (2) includes a tip heating wire outlet groove II (21) and an anti-rotation protrusion (22). The tip heating wire outlet groove II (21) is aligned and connected with the tip heating wire outlet groove I (12).

2. The tip heating structure according to claim 1, characterized in that: The nozzle body (1) has a heat insulation cap groove (13) at the glue dispensing end.

3. The tip heating structure according to claim 2, characterized in that: One end of the tip heating wire (11) is installed in the embedded groove (14) below the tip body (1), and the other end of the tip heating wire (11) is continuously wound into the embedded groove (14) above the tip body (1). The other end of the tip heating wire (11) passes through the tip heating wire outlet groove I (12) and the tip heating wire outlet groove II (21).

4. A heating nozzle, characterized in that: The device includes a hot nozzle body (3), which has a hot nozzle flow channel (35) inside. The hot nozzle body (3) has a nozzle tip mounting groove (31) below it. The inner wall of the nozzle tip mounting groove (31) has a long strip-shaped anti-rotation protrusion groove (32) vertically opened. The inner wall of the nozzle tip mounting groove (31) above the anti-rotation protrusion groove (32) has a nozzle tip heating wire outlet hole (33). The nozzle tip heating wire outlet hole (33) is connected to the nozzle tip heating wire outlet groove III (34) opened in the hot nozzle body (3). The tip heating structure as described in claim 3 is installed in the tip mounting groove (31).

5. The hot nozzle according to claim 4, characterized in that: The nozzle body (1) and the anti-rotation cable groove sleeve (2) are installed in the nozzle mounting groove (31); The anti-rotation protrusion (22) is installed in the anti-rotation protrusion groove (32); The nozzle tip channel (15) is connected to the hot nozzle channel (35) and is equipped with a valve needle (6); A tip cap (4) is installed between the tip body (1) and the tip mounting groove (31); A nozzle tip body reinforcement sleeve (5) is installed on the outer wall of the hot nozzle body (3) near the anti-rotation protrusion groove (32); A heat insulation cap (7) is installed inside the heat insulation cap groove (13); Heating elements (8) are installed on the outer wall of the hot nozzle body (3).

6. The hot nozzle according to claim 5, characterized in that: The other end of the heating wire (11) that passes through the heating wire outlet groove I (12) and the heating wire outlet groove II (21) passes through the heating wire outlet hole (33) and the heating wire outlet groove III (34) and exits outside the heating nozzle body (3).

7. A hot runner system, characterized in that: The hot runner system includes a hot nozzle as described in any one of claims 4 to 6.

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