A hot runner nozzle

Abstract

The utility model discloses a hot runner nozzle, including hot runner mainboard, main injection nozzle and 2 or more than that nozzle, main injection nozzle and nozzle install on hot runner mainboard, and the export of main injection nozzle is connected with the nozzle import through the mainboard runner on hot runner mainboard, the inside of main injection nozzle evenly is provided with 3 or more than that first helical groove, and first helical groove extends to the bottom end terminal point after rotating 15~30 degrees from the inside top end starting point of main injection nozzle downward. The utility model can make hot runner system glue fluid temperature even, and the glue is more powerful, and mixes evenly, and the flowability of material is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of hot runner dispensing systems, specifically a hot runner nozzle. Background Technology

[0002] Hot runner nozzles in injection molding machines are core components for precise molten material delivery during plastic molding. Molten plastic flows from the injection molding machine barrel through the hot runner system to the mold cavity. Throughout this process, the nozzle must maintain the high-temperature melt flowability while precisely controlling the timing and location of material delivery. Hot runner nozzles typically consist of four main parts: an alloy steel body, a heating element, a temperature measuring device, and heat insulation components. The body contains hot runner orifices and is classified into two types based on the mold structure: open type and needle valve type.

[0003] The flow characteristics of the melt in the hot runner directly affect the molding quality. In existing technologies, a flow divider structure is incorporated inside the nozzle to force shear flow in the melt, preventing material stagnation in low-temperature zones. Needle valve nozzles feature a tapered guide surface at the end of the runner, ensuring uniform distribution of the melt in a laminar flow state during injection. The gradient angle design of the transition zone between the main runner and the gate directly impacts pressure loss; an empirical value of 15°-25° balances flow resistance and shear heating.

[0004] Existing hot runner nozzles generally have the following problems: uneven or no glue dispensing, uneven color of the mixture, insufficient injection volume, poor melt flow, shrinkage marks, cold glue, etc. If the glue dispensing is not in place, it will lead to defects in the injection molded products, such as bubbles, surface depressions, substandard product density, and unstable dimensions.

[0005] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] In view of the above-mentioned defects, the purpose of this utility model is to provide a hot runner nozzle that can make the adhesive fluid temperature uniform in the hot runner system, make the adhesive discharge more powerful, mix evenly, and greatly improve the fluidity of the material.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A hot runner nozzle includes a hot runner main board, a main injection nozzle, and two or more nozzles. The main injection nozzle and the nozzles are mounted on the hot runner main board. The outlet of the main injection nozzle is connected to the nozzle inlet through a main board flow channel on the hot runner main board. The inner side of the main injection nozzle is uniformly provided with three or more first spiral grooves. The first spiral grooves extend from the inner top starting point of the main injection nozzle by rotating downwards by 15 to 30 degrees to the bottom end point.

[0009] Furthermore, the nozzle has two or more second spiral grooves evenly arranged on its inner side. The second spiral grooves extend from the top of the nozzle's inner side, rotating downwards by 15 to 30 degrees to the bottom end.

[0010] Furthermore, the sum of the widths of the first spiral grooves is less than the perimeter of the inner cross-section of the main injection nozzle, but greater than 2 / 3 of the perimeter of the inner cross-section of the main injection nozzle.

[0011] Furthermore, the sum of the widths of the second spiral grooves is less than the circumference of the inner cross-section of the nozzle, but greater than 1 / 2 of the circumference of the inner cross-section of the nozzle.

[0012] Furthermore, the depth of the first spiral groove is 1 / 4 to 1 / 3 of the thickness of the main injection nozzle.

[0013] Furthermore, the depth of the second spiral groove is 1 / 3 to 1 / 2 of the nozzle thickness.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention utilizes spiral grooves evenly arranged on the inner sides of the main injection nozzle and the nozzle to form a vortex-shaped inner cavity. When the high-temperature plastic raw material flows through the main injection nozzle and the nozzle, it forces the colloid to form a rotating fluid, increases the pressure of the plastic raw material fluid and generates rotational force, thereby achieving the purpose of fully mixing the raw materials and increasing the pressure and speed in the injection cavity, thus reducing various product defects. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a hot runner nozzle according to the present invention;

[0017] Figure 2 This is a top view of the nozzle cavity described in this utility model;

[0018] In the diagram, 1-hot runner main board, 2-main injection nozzle, 3-nozzle, 4-main board flow channel, 5-first spiral groove, 6-second spiral groove. Detailed Implementation

[0019] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. In the description of these embodiments, it should be understood that terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing these embodiments and simplifying the description. They do not indicate or imply that the device or component 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 utility model.

[0020] like Figure 1-2As shown, a hot runner nozzle includes a hot runner main board 1, a main injection nozzle 2, and two or more nozzles 3. The main injection nozzle 2 and the nozzles 3 are mounted on the hot runner main board 1. The outlet of the main injection nozzle 2 is connected to the inlet of the nozzle 3 through a main board flow channel 4 on the hot runner main board 1. The inner channel of the main injection nozzle 2 is uniformly provided with three or more first spiral grooves 5. The first spiral grooves 5 extend downwards from the inner top end of the main injection nozzle 2 by rotating 15-30 degrees to the bottom end. In this embodiment, the number of first spiral grooves 5 is four. Figure 2 As shown; the first spiral groove 5 extends from the inner top end of the main injection nozzle 2, rotating downwards by 30 degrees to the bottom end, as... Figure 2 Angle A shown is 30 degrees.

[0021] This invention creates a vortex-shaped inner cavity channel by uniformly arranging the first spiral groove 5 in the inner channel of the main injection nozzle 2. When the high-temperature plastic raw material flows through the main injection nozzle 2, it forces the colloid to form a rotating fluid, increases the pressure of the plastic raw material fluid and generates a rotational force, thereby achieving the purpose of fully mixing the raw materials.

[0022] As a preferred embodiment of the above implementation, such as Figure 2 Similar to the main injection nozzle 2, two or more second spiral grooves 6 can be evenly arranged inside the channel of the nozzle 3. The second spiral grooves 6 extend downwards from the top of the nozzle 3 by rotating 15-30 degrees to the bottom. By evenly arranging the first spiral grooves 6 inside the channel of the nozzle 3, a vortex-shaped inner cavity channel is formed within the nozzle 3. When the high-temperature plastic raw material flows through the nozzle 3, it forces the colloid to form a rotating fluid, further increasing the pressure of the plastic raw material fluid and generating rotational force, thus achieving the purpose of further and more thoroughly mixing the raw materials.

[0023] As a preferred embodiment of the above implementation, the sum of the widths of the first spiral grooves 5 is less than the perimeter of the inner cross-section of the main injection nozzle 2, but greater than 2 / 3 of the perimeter of the inner cross-section of the main injection nozzle 2. By increasing the size of the vortex channel, the rotational force and mixing effect of the vortex can be further improved.

[0024] In a preferred embodiment of the above-described method, the sum of the widths of the second spiral grooves 6 is less than the perimeter of the inner cross-section of the nozzle 3, but greater than half the perimeter of the inner cross-section of the nozzle. By increasing the size of the vortex channel, the rotational force and mixing effect of the vortex can be further improved.

[0025] As a preferred embodiment of the above implementation, the depth of the first spiral groove 5 is 1 / 4 to 1 / 3 of the maximum thickness of the main injection nozzle 2. This takes into account both the size of the vortex channel and the structural strength of the main injection nozzle 2.

[0026] As a preferred embodiment of the above-described method, the depth of the second spiral groove 6 is 1 / 3 to 1 / 2 of the thickness of the nozzle 3. This takes into account both the size of the vortex channel and the structural strength of the nozzle 3.

[0027] This invention utilizes spiral grooves evenly arranged on the inner sides of the main injection nozzle and the nozzle to form a vortex-shaped inner cavity. When the high-temperature plastic raw material flows through the main injection nozzle and the nozzle, it forces the colloid to form a rotating fluid, increases the pressure of the plastic raw material fluid and generates rotational force, thereby achieving the purpose of fully mixing the raw materials and increasing the pressure and speed in the injection cavity, thus reducing various product defects.

[0028] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A hot runner nozzle, characterized in that: It includes a hot runner main board, a main injection nozzle, and two or more nozzles. The main injection nozzle and the nozzles are mounted on the hot runner main board. The outlet of the main injection nozzle is connected to the nozzle inlet through the main board flow channel on the hot runner main board. The inner side of the main injection nozzle is uniformly provided with three or more first spiral grooves. The first spiral grooves extend from the inner top starting point of the main injection nozzle by rotating downwards by 15 to 30 degrees to the bottom end point.

2. The hot runner nozzle according to claim 1, characterized in that: The nozzle has two or more second spiral grooves evenly arranged on its inner side. The second spiral grooves extend from the top of the nozzle's inner side, rotating downwards by 15 to 30 degrees to the bottom end.

3. A hot runner nozzle according to claim 1, characterized in that: The sum of the widths of the first spiral grooves is less than the perimeter of the inner cross-section of the main injection nozzle, but greater than 2 / 3 of the perimeter of the inner cross-section of the main injection nozzle.

4. A hot runner nozzle according to claim 2, characterized in that: The sum of the widths of the second spiral grooves is less than the circumference of the inner cross-section of the nozzle, but greater than 1 / 2 of the circumference of the inner cross-section of the nozzle.

5. A hot runner nozzle according to claim 1, characterized in that: The depth of the first spiral groove is 1 / 4 to 1 / 3 of the thickness of the main injection nozzle.

6. A hot runner nozzle according to claim 2, characterized in that: The depth of the second spiral groove is 1 / 3 to 1 / 2 of the nozzle thickness.

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