Multi-head hot nozzle and hot runner system having the same

Abstract

The present invention provides a multi-head hot nozzle and a hot runner system having the same. A plurality of flow channels extending up and down are arranged in the main body of the multi-head hot nozzle. The main body has a central axis extending in the up and down directions. The plurality of flow channels are evenly arranged around the central axis. The multi-head hot nozzle also includes an arc portion arranged on the outside of the flow channel, and a transition portion connecting two adjacent arc portions. The outer surface of the arc portion is concentrically arranged with the flow channel, and the distance between the outer surface of the transition portion and the central axis is smaller than the distance between the outer surface of the arc portion and the central axis. Compared with the prior art, the multi-head hot nozzle of the present invention can reduce the volume of the multi-head hot nozzle by arranging the arc portion and the transition portion, avoid mutual interference between adjacent multi-head hot nozzles, and realize that multiple multi-head hot nozzles can simultaneously inject dense products with multiple injection points and a small distance between the injection points, and reduce the area of ​​the injection points on the mold, thereby improving the mold strength.

Description

Technical Field

[0001] The invention relates to the technical field of hot runner injection molding, in particular to a multi-head hot nozzle and a hot runner system having the same. Background Art

[0002] When using hot runner system for injection molding, in order to improve the injection molding efficiency, multi-head hot nozzles are often used for injection molding, and even multiple multi-head hot nozzles are used for injection molding at the same time. However, when injecting intensive products with multiple injection points and small injection point spacing, the currently commonly used multi-head hot nozzles will interfere with each other due to the limitations of shape and volume, and it is impossible to inject intensive products with multiple injection points and small injection point spacing. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a multi-head hot nozzle and a hot runner system having the same, so as to solve the problem of interference between adjacent multi-head hot nozzles when injecting dense products with multiple injection points and small injection point spacing.

[0004] To achieve one of the above-mentioned purposes of the invention, the present invention provides a multi-head hot nozzle, including a main body, in which a plurality of flow channels extending upward and downward are arranged, the main body has a central axis extending upward and downward, and the plurality of flow channels are evenly arranged around the central axis, the multi-head hot nozzle also includes an arc portion arranged on the outside of the flow channel, and a transition portion connecting two adjacent arc portions, the outer surface of the arc portion is concentrically arranged with the flow channel, and the distance between the outer surface of the transition portion and the central axis is smaller than the distance between the outer surface of the arc portion and the central axis.

[0005] As a further improvement of an embodiment of the present invention, the transition portion is an arc-shaped groove recessed toward the central axis.

[0006] As a further improvement of an embodiment of the present invention, four flow channels are provided.

[0007] As a further improvement of one embodiment of the present invention, the multi-head hot nozzle also includes a connecting portion connected to the upper end of the main body, and the connecting portion is provided with a drainage channel connected to the flow channel.

[0008] As a further improvement of an embodiment of the present invention, it further includes a heating device and a cavity for accommodating the heating device, wherein the cavity extends from the connecting portion to the main body.

[0009] As a further improvement of an embodiment of the present invention, the cavity is formed by rotating around the central axis.

[0010] As a further improvement of an embodiment of the present invention, it further includes a temperature sensing wire and a hole for accommodating the temperature sensing wire, and the hole passes through the connecting portion and the main body from top to bottom.

[0011] As a further improvement of an embodiment of the present invention, a receiving groove is provided at the upper end of the connecting portion, the receiving groove penetrates the connecting portion in a direction perpendicular to the central axis, and the cavity and the hole are respectively connected to the receiving groove.

[0012] As a further improvement of one embodiment of the present invention, it also includes a nozzle tip arranged at the lower end of the main body, the nozzle tip is connected to the flow channel, the end of the nozzle tip away from the main body has a positioning tip, the nozzle tip is provided with a feeding hole, and the feeding hole is connected to the flow channel.

[0013] In order to achieve one of the above-mentioned purposes of the invention, one embodiment of the present invention further provides a hot runner system, including the multi-head hot nozzle as described above.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the multi-head hot nozzle and the hot runner system having the same of the present invention, the multiple runners of the multi-head hot nozzle are evenly arranged around the central axis, and multiple points can be injected at the same time. The distance between the outer surface of the transition part and the central axis is smaller than the distance between the outer surface of the arc part and the central axis, which can reduce the volume of the multi-head hot nozzle. When injecting dense products with multiple injection points, not only the mutual interference between adjacent multi-head hot nozzles is avoided, but also multiple multi-head hot nozzles can be used to inject dense products with multiple injection points and the injection points having a very small distance at a time, thereby further improving the injection molding efficiency, reducing the area of ​​the injection points on the mold, and improving the mold strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of a multi-head hot nozzle according to an embodiment of the present invention;

[0016] Figure 2 This is a front view of a multi-head hot nozzle according to an embodiment of the present invention;

[0017] Figure 3 yes Figure 2 The longitudinal section view along the AA line;

[0018] Figure 4 It is a right side view of a multi-head hot nozzle according to an embodiment of the present invention;

[0019] Figure 5 yes Figure 4 The longitudinal section along line BB;

[0020] Figure 6 is a top view of a multi-head hot nozzle according to an embodiment of the present invention;

[0021] Figure 7 1. It is a bottom view of a multi-head hot nozzle according to an embodiment of the present invention;

[0022] Figure 8 It is a three-dimensional structural schematic diagram of a multi-head hot nozzle from another angle according to an embodiment of the present invention;

[0023] Fig. 9 yes Figure 8 Enlarged schematic diagram of part C in the middle. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings.

[0025] In various drawings of the present invention, for the sake of convenience of illustration, some sizes of structures or parts are exaggerated relative to other structures or parts, and thus, only the basic structure of the subject matter of the present invention is illustrated.

[0026] See also Figures 1 to 5 A hot runner system provided by one embodiment of the present invention adopts a multi-head hot nozzle 100, which includes a main body 1, in which a plurality of flow channels 11 extending up and down are arranged, wherein the main body 1 has a central axis extending in the up and down directions, and the plurality of flow channels 11 are evenly arranged around the central axis to realize simultaneous injection molding of multiple injection points of the mold.

[0027] See also Figure 1 The multi-head hot nozzle 100 also includes an arc portion 12 arranged on the outside of the flow channel 11, and a transition portion 13 connecting two adjacent arc portions 12. The outer surface of the arc portion 12 is concentrically arranged with the flow channel 11, that is, the arc portion 12 and the flow channel 11 are arranged one by one, and the number of the arc portions 12 is the same as the number of the flow channels 11. There are also multiple arc portions 12. Correspondingly, since the multiple flow channels 11 are evenly arranged around the central axis, the number of the transition portions 13 and the flow channels 11 is also the same.

[0028] On a plane perpendicular to the central axis, the distances from the outer surfaces of the multiple arc-shaped portions 12 to the central axis are equal. In order to reduce the volume and occupied space of the multi-head hot nozzle 100, the distance between the outer surface of the transition portion 13 and the central axis is smaller than the distance between the outer surface of the arc-shaped portion 12 and the central axis. In this way, when injecting a dense product with multiple injection molding points, not only is the mutual interference between adjacent multi-head hot nozzles 100 avoided, but multiple multi-head hot nozzles 100 can be used to inject dense products with multiple injection molding points and a small distance between the injection molding points at the same time, thereby further improving the injection molding efficiency, reducing the area of ​​the injection molding points on the mold, and improving the mold strength.

[0029] Furthermore, in this embodiment, the transition portion 13 is an arc-shaped groove that is concave toward the central axis. The transition portion 13 smoothly transitions from the connecting portion 2 to the central axis, which further reduces the volume of the multi-head hot nozzle 100 while ensuring the strength of the multi-head hot nozzle 100, saves materials, and avoids the mold strength reduction or mold deformation caused by the injection point opening on the mold being too large.

[0030] See also Figure 6 Preferably, in this embodiment, four flow channels 11 are provided, and the four flow channels 11 are distributed around the central axis at intervals of 90°. On a plane perpendicular to the central axis, the flow channels 11 are circular, and the distances from the centers of the four flow channels 11 to the central axis are equal. Correspondingly, four arc-shaped portions 12 are also provided, and four transition portions 13 are also provided.

[0031] In other embodiments, the number of flow channels 11 and corresponding arc portions 12 and transition portions 13 can be set according to actual needs, as long as the distance between the outer surface of the transition portion 13 and the central axis is smaller than the distance between the outer surface of the arc portion 12 and the central axis.

[0032] See also Figures 1 to 5 Furthermore, the multi-head hot nozzle 100 also includes a connecting portion 2 connected to the upper end of the main body 1. In this embodiment, in order to reduce the interference spacing between the multi-head hot nozzles 100, the connecting portion 2 is square in the direction perpendicular to the central axis, and the four flow channels 11 are respectively located at the two ends of the two diagonals of the square, and the four arc-shaped portions 12 are approximately located at the four corners of the square. In this way, the strength of the multi-head hot nozzle 100 is guaranteed under the premise of reducing the interference spacing between adjacent hot nozzles. In addition, the connecting portion 2 is provided with a drainage channel 21 connected to the flow channel 11. In this embodiment, correspondingly, there are four drainage channels 21, which are respectively connected to the four flow channels 11 to play a drainage role.

[0033] Furthermore, the multi-head hot nozzle 100 further includes a heating device and a cavity 3 for accommodating the heating device, the cavity 3 extending from the connecting portion 2 to the main body 1, but the cavity 3 does not penetrate the main body 1, so that it is not only avoided that the heating device is arranged outside the multi-head hot nozzle 100 to increase its volume, but also it is possible to avoid heat loss caused by the external placement of the heating device, thereby ensuring the heating efficiency of the multi-head hot nozzle 100. The heating device can be a heating rod or a heating wire.

[0034] See also Figure 3 and Figure 5 In this embodiment, the cavity 3 is formed by rotating around the central axis. When the heating device is placed in the cavity 3, the distance between the heating device and each flow channel 11 is the same, so that each flow channel 11 is heated evenly.

[0035] See also Figure 6 Furthermore, the multi-head hot nozzle 100 also includes a temperature-sensitive wire and a hole 4 for accommodating the temperature-sensitive wire, the hole 4 passes through the connecting part 2 and the main body 1 from top to bottom, and a probe for measuring temperature is provided at the end of the temperature-sensitive wire to measure the temperature of the multi-head hot nozzle 100.

[0036] See also Figures 1 to 3 ,as well as Figure 5 to Figure 6 Furthermore, a receiving groove 22 is provided at the upper end of the connecting portion 2. In the present embodiment, the receiving groove 22 penetrates the connecting portion 2 in a direction perpendicular to the central axis, the cavity 3 and the hole 4 are respectively connected to the receiving groove 22, the temperature sensing wire extends into the hole 4 through the receiving groove 22, and the connecting wire of the heating device extends into the cavity 3 through the receiving groove 22, so that the receiving groove 22 accommodates the temperature sensing wire and the connecting wire of the heating device.

[0037] See also Figures 7 to 9 Furthermore, the multi-head hot nozzle 100 also includes a nozzle tip 5 disposed at the lower end of the main body 1. Specifically, the nozzle tip 5 is connected to the flow channel 11. The end of the nozzle tip 5 away from the main body 1 has a positioning tip 51. The positioning tip 51 is inserted into the injection point of the mold to play a positioning role. A feed hole 52 is provided in the nozzle tip 5. The feed hole 52 is connected to the flow channel 11 to inject the fluid in the flow channel 11 into the mold cavity.

[0038] Compared with the prior art, the multi-head hot nozzle 100 and the hot runner system having the same provided by the present invention have the following beneficial effects: the multiple flow channels 11 of the multi-head hot nozzle 100 are evenly arranged around the central axis, so that multiple points can be injected at the same time, and the distance between the outer surface of the transition portion 13 and the central axis is smaller than the distance between the outer surface of the arc portion 12 and the central axis, which can reduce the volume of the multi-head hot nozzle 100 and save materials. When injecting a dense product with multiple injection points, not only can the interference between adjacent multi-head hot nozzles 100 be avoided, but multiple multi-head hot nozzles 100 can be simultaneously injected into a dense product with multiple injection points and a small distance between the injection points, further improving the injection molding process. Efficiency is improved, and the area of ​​the injection point on the mold is reduced, so as to avoid the situation that the opening of the injection point on the mold is too large, resulting in reduced mold strength or mold deformation; by providing a cavity 3 for accommodating the heating device, the cavity 3 extends from the connecting part 2 to the main body 1, so as to avoid the heating device being arranged on the outside of the multi-head hot nozzle 100 and increasing its volume; the cavity 3 is formed by rotating around the central axis, so that each flow channel 11 is heated evenly; by providing a hole 4 for accommodating the temperature sensing line, the temperature of the fluid in the flow channel 11 can be measured; the upper end of the connecting part 2 is provided with a accommodating groove 22 to accommodate the temperature sensing line and the connecting line of the heating device; the nozzle tip 5 provided at the lower end of the main body 1 can not only inject the fluid in the flow channel 11 into the mold cavity, but also play a positioning role.

[0039] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0040] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-head hot nozzle, comprising a main body, wherein a plurality of flow channels extending up and down are arranged in the main body, characterized in that: The main body has a central axis extending in the up-down direction, and the plurality of flow channels are evenly arranged around the central axis. The multi-head hot nozzle also includes an arc portion arranged on the outside of the flow channel, and a transition portion connecting two adjacent arc portions. The outer surface of the arc portion is concentrically arranged with the flow channel, and the distance between the outer surface of the transition portion and the central axis is smaller than the distance between the outer surface of the arc portion and the central axis. The multi-head hot nozzle also includes a connecting portion connected to the upper end of the main body, a nozzle tip arranged at the lower end of the main body, a heating device, a cavity for accommodating the heating device, a temperature sensing line and a hole for accommodating the temperature sensing line. The nozzle tip is connected to the flow channel, and the cavity extends from the connecting portion to the main body. The connecting portion is provided with a drainage channel connected to the flow channel. The upper end of the connecting portion is provided with a accommodating groove, and the accommodating groove passes through the connecting portion in a direction perpendicular to the central axis. The cavity and the hole are respectively connected to the accommodating groove.

2. The multi-head hot nozzle according to claim 1, characterized in that: The transition portion is an arc-shaped groove recessed toward the central axis.

3. The multi-head hot nozzle according to claim 1, characterized in that: There are four flow channels.

4. The multi-head hot nozzle according to claim 1, characterized in that: The cavity is formed by rotation about the central axis.

5. The multi-head hot nozzle according to claim 4, characterized in that: The hole passes through the connecting portion and the main body in an up-and-down manner.

6. The multi-head hot nozzle according to claim 1, characterized in that: The nozzle tip has a positioning tip at one end away from the main body, and a material passing hole is provided on the nozzle tip, and the material passing hole is communicated with the flow channel.

7. A hot runner system, characterized in that: It comprises a multi-head hot nozzle as described in any one of claims 1 to 6.

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