A cooling jacket and hot runner system

Abstract

The present application belongs to the technical field of injection mold, the cooling jacket and hot runner system are provided in the present application, the cooling jacket can be used for reducing the temperature of the product adjacent to the injection port of the mold core, and the temperature of the head part of the hot runner main body is kept stable. The cooling jacket comprises a sleeve body made of heat insulation material, and / or the sleeve body has a heat insulation structure, the sleeve body is arranged on the mold core, the peripheral wall of the sleeve body and the mold core can be combined into a cooling channel, and the cooling medium flows in the cooling channel. The circulating cooling medium can reduce the temperature of the product adjacent to the injection port of the mold core, thereby avoiding the problems of product scalding or carbonization caused by the high temperature of the product at the injection port after pouring. Moreover, during the cooling process of the mold core, since the cooling jacket is made of heat insulation material, the temperature of the molten plastic in the hot runner main body will not be affected by the circulating cooling medium, thereby avoiding the shear heat of the molten plastic.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and in particular to a cooling jacket and a hot runner system. Background Art

[0002] Hot runners are widely used in mold injection production. If the nozzle in the hot runner system is not cooled properly, the temperature of the product at the injection port may be too high, which may cause burns on the molded product, wire drawing or carbonization of the glue mouth, etc. At present, the cooling of hot runners during injection molding is mainly achieved by adding cooling water channels or cooling water jackets on the mold core to achieve the cooling effect.

[0003] However, the current cooling jacket only has a cooling effect. When the hot runner body is heated, the cooling jacket is also cooled at the same time, which can easily cause shear heat in the molten plastic inside the hot runner body. This can easily cause the molten plastic to turn yellow or carbonize due to excessive temperature, affecting product production.

[0004] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0005] The object of the present invention is to provide a cooling jacket and a hot runner system that can not only reduce the temperature of the product near the injection port, but also prevent the molten plastic inside the hot runner body from generating shear heat.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A cooling sleeve is used to reduce the temperature of a product near an injection port on a mold core. The cooling sleeve includes a sleeve body, which is made of a heat-insulating material and / or has a heat-insulating structure. The sleeve body is arranged on the mold core and is arranged opposite to the injection port. A cooling channel can be formed between the peripheral wall of the sleeve body and the mold core, and a cooling medium flows inside the cooling channel.

[0008] Preferably, the casing comprises:

[0009] An inner sleeve, the inner sleeve comprising an annular sleeve wall and an annular sleeve seat, the sleeve wall and the sleeve seat forming a barrel shape, and the inner sleeve is made of a heat-insulating material;

[0010] The outer sleeve is shaped like the inner sleeve, the outer sleeve is arranged on the mold core, the inner sleeve is arranged inside the outer sleeve, and the outer sleeve and the inner sleeve form a heat-insulating cavity, the notch is arranged on the outer side wall of the outer sleeve, and a flow port is provided at the bottom of the outer sleeve, and the flow port and the center of the sleeve seat are arranged opposite to the injection port.

[0011] Preferably, the heat-insulating cavity portion is located above the cooling channel.

[0012] Preferably, the sleeve wall includes a connecting portion and a cavity side portion arranged upper and lower, the connecting portion is connected to the inner wall of the outer sleeve, and the insulation cavity is located between the cavity side portion and the inner wall of the outer sleeve.

[0013] Preferably, the cooling jacket further comprises a heat insulator, which is arranged between the inner jacket and the outer jacket and around the axis of the flow port.

[0014] Preferably, a flange is provided on the top of the sleeve wall, and the flange is overlapped with the top of the outer sleeve.

[0015] Preferably, the inner sleeve is made of titanium alloy.

[0016] Preferably, sealing bodies are provided on both sides of the notch along the length direction of the sleeve body, and the sealing bodies are clamped between the sleeve body and the mold core.

[0017] A hot runner system includes a hot runner body, a hot nozzle core, a valve needle and a hot nozzle cover, wherein the hot nozzle cover is arranged at the end of the hot runner body and is arranged opposite to the injection port, the hot nozzle core is sleeved inside the hot nozzle cover, and the valve needle is arranged on the hot nozzle core. The hot runner system also includes the cooling jacket as described above, which can be sleeved on the outside of the hot runner body.

[0018] Preferably, the cooling jacket further comprises a heat insulator, which is arranged between the inner jacket and the outer jacket and around the axis of the flow port;

[0019] The heat insulator is arranged in the heat insulation cavity and is sleeved on the outer side of the hot nozzle cover.

[0020] Beneficial effects of the present invention:

[0021] The cooling jacket and hot runner system proposed in this invention cools the product near the mold core and injection port by circulating a cooling medium within the cooling channel. This prevents problems such as burns, stringing, or carbonization at the injection port caused by excessively high temperatures at the injection port after casting. Furthermore, during the mold core cooling process, the cooling jacket, made of a thermally insulating material, prevents the temperature of the molten plastic in the hot runner body from being affected by the circulating cooling medium, thereby preventing shear heating of the molten plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a hot runner system provided in an embodiment of the present invention;

[0023] Figure 2 1 is a schematic structural diagram of a sleeve provided in an embodiment of the present invention;

[0024] Figure 3 yes Figure 1 A partial enlarged view of point A in the middle.

[0025] In the picture:

[0026] 100, cooling jacket; 200, hot runner body; 300, hot nozzle core; 400, valve needle; 500, hot nozzle cover; 600, mold core; 700, pipeline;

[0027] 1. Sleeve body; 11. Inner sleeve; 111. Sleeve wall; 1111. Connecting part; 1112. Cavity side; 112. Sleeve seat; 113. Flanged edge; 12. Outer sleeve; 121. Spout; 122. Protrusion; 123. Notch; 13. Insulation cavity; 2. Insulation body; 3. Sealing body. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0032] See also Figures 1 to 3 In this embodiment, a hot runner system is proposed, which includes a cooling jacket 100, a hot runner body 200, a hot nozzle core 300, a valve needle 400, a hot nozzle cover 500 and a mold core 600. The hot runner body 200 is connected to the inside of the mold core 600, the hot nozzle cover 500 is arranged at the end of the hot runner body 200 and is arranged opposite to the injection port of the mold core 600, the hot nozzle core 300 is sleeved inside the hot nozzle cover 500, the valve needle 400 is arranged on the hot nozzle core 300, and the valve needle 400 can be used to open and close the injection port, the cooling jacket 100 can be sleeved on the outside of the hot runner body 200, and can wrap the side walls of the hot nozzle cover 500 and the side walls of the hot nozzle core 300. It can be understood that after the molten plastic passes through the hot runner body 200, it flows into the molding cavity of the mold (not shown in the figure) through the flow channel between the hot nozzle core 300 and the hot nozzle cover 500. The valve needle 400 provided can control the molten plastic to enter the molding cavity through the driving device. After the molten plastic enters the molding cavity, the cooling sleeve 100 provided can cool the molded product to avoid problems such as product burns, plastic nozzle wire drawing or carbonization due to excessive temperature of the product at the injection port.

[0033] Based on the above, this embodiment also proposes a cooling sleeve 100 for reducing the temperature of the product near the injection port on the mold core 600. The cooling sleeve 100 includes a sleeve body 1, wherein the sleeve body 1 is made of a heat-insulating material, and / or the sleeve body 1 has a heat-insulating structure. The sleeve body 1 is arranged on the mold core 600, and the sleeve body 1 is arranged opposite to the injection port. The peripheral wall of the sleeve body 1 and the mold core 600 can be assembled into a cooling channel, and a cooling medium circulates inside the cooling channel. Specifically, an annular notch 123 is provided on the peripheral wall of the sleeve body 1, and the mold core 600 can cover the opening of the notch 123 so that the mold core 600 and the inner wall of the notch 123 are assembled into a cooling channel, and a circulating cooling medium is provided inside the cooling channel.

[0034] In this embodiment, a circulation line 700 is provided within the mold core 600. The circulation line 700 can communicate with the cooling channel to facilitate the circulation of a cooling medium in the cooling pipe. The cooling medium circulates in the cooling pipe and absorbs heat from the mold core 600 during the flow process, thereby reducing the temperature of the product at the injection port, thereby preventing problems such as burns, stringing, or carbonization of the product. The cooling medium is preferably a heat-absorbing liquid medium such as water.

[0035] It is understood that by providing a circulating cooling medium within the cooling channel, the cooling medium can absorb some of the heat from the mold core 600 during its flow, thereby cooling the mold core 600. This can prevent problems such as product burns, stringing, or carbonization at the injection port due to excessive temperatures at the injection port of the cast product. Furthermore, during the cooling process of the mold core 600, the thermal insulation properties of the cooling jacket 100 prevent the temperature within the hot runner body 200 from being affected by the circulating cooling medium, thereby preventing shear heat from being generated by the molten plastic.

[0036] Specifically, the sleeve body 1 includes an inner sleeve 11 and an outer sleeve 12. The inner sleeve 11 includes an annular sleeve wall 111 and an annular sleeve seat 112. The sleeve wall 111 and the sleeve seat 112 form a barrel shape, and the inner sleeve 11 has thermal insulation properties. It is understood that one end of the hot runner body 200 extends into the interior of the inner sleeve 11, and the hot nozzle cover 500 is positioned opposite the center of the sleeve seat 112, with the peripheral wall of the hot nozzle cover 500 connected to the central side wall of the sleeve seat 112. It is important to note that a gap is provided between the inner sleeve 11 and the outer wall of the hot runner body 200 to prevent heat from the hot runner body 200 from transferring to the inner sleeve 11, thereby further improving the thermal insulation performance of the inner sleeve 11. In particular, the material of the inner sleeve 11 can be selected from a material with good thermal insulation properties, such as titanium alloy, and is not specifically limited in this embodiment.

[0037] The outer sleeve 12 is contoured to the inner sleeve 11. The outer sleeve 12 is positioned within the mold core 600, and the inner sleeve 11 is positioned within the outer sleeve 12. An insulating cavity 13 is formed between the outer sleeve 12 and the inner sleeve 11. A notch 123 is provided on the outer wall of the outer sleeve 12, and the inner wall of the notch 123 and the mold core 600 form a cooling channel. The insulating cavity 13 not only improves the thermal insulation effect of the cooling sleeve 100, but also prevents the cooling medium from removing heat from the inner sleeve 11 during flow, thereby further improving the thermal insulation effect of the cooling sleeve 100 on the hot runner body 200 and further protecting the molten plastic in the hot runner body 200 from shear heat. The outer sleeve 12 and inner sleeve 11 constitute the insulating structure of the sleeve body 1, which can maintain the temperature inside the hot runner body 200 while the cooling medium flows, while also reducing the temperature of the product near the injection port.

[0038] It should be noted that a flow port 121 is provided at the bottom of the outer sleeve 12 . The flow port 121 and the center of the sleeve 112 are both arranged opposite to the injection port to facilitate the flow of molten plastic into the molding cavity.

[0039] Furthermore, the insulating cavity 13 is partially located above the notch 123, that is, the insulating cavity 13 is partially located above the cooling channel. It is understood that while the cooling medium in the cooling channel flows, it may absorb some of the heat from within the insulating cavity 13. However, since the air within the insulating cavity 13 is heated by the temperature within the hot runner body 200, the heated air moves toward the top of the insulating cavity 13. This significantly reduces the amount of heat absorbed by the cooling medium from within the insulating cavity 13, thereby further improving the thermal insulation performance of the cooling jacket 100 and further protecting the molten plastic in the hot runner body 200 from shear heat. In particular, the outer jacket 12 is preferably made of a high-hardness, corrosion-resistant material such as alloy steel.

[0040] In this embodiment, the sleeve wall 111 includes a connecting portion 1111 and a cavity side portion 1112 disposed above and below. The connecting portion 1111 is connected to the inner wall of the outer sleeve 12, and the thermal insulation cavity 13 is located between the cavity side portion 1112 and the inner wall of the outer sleeve 12. The inner sleeve 11 and the outer sleeve 12 can be connected via the connecting portion 1111. Here, the connection between the inner sleeve 11 and the outer sleeve 12 is preferably a detachable connection such as a thread. When the inner sleeve 11 and the outer sleeve 12 are connected by a thread, the outer sleeve 12 can be removed from the inner sleeve 11. This facilitates the replacement of the outer sleeve 12 when burrs appear at the flow port 121 after long-term injection molding of the hot runner system, thereby saving costs.

[0041] See also Figure 2 or Figure 3 The cooling jacket 100 also includes an insulator 2, which is disposed between the inner jacket 11 and the outer jacket 12 and arranged around the axis of the flow port 121. The rotating insulator 2 prevents the molten plastic from transferring heat to the bottom of the outer jacket 12 as it flows through the jacket seat 112. This prevents heat from being transferred from the bottom of the outer jacket 12 to the molding cavity, causing the sidewalls of the molding cavity to overheat and leading to carbonization of the molded product. The insulator 2 is preferably made of a thermally insulating material such as polyimide.

[0042] Specifically, the heat insulator 2 is disposed in the heat insulation cavity 13 and sleeved on the outside of the nozzle cover 500. This ensures that the temperature of the molten plastic at the nozzle cover 500 is stable and does not lose heat, and hinders heat transfer between the nozzle cover 500 and the mold core 600.

[0043] In this embodiment, a flange 113 is provided at the top of the sleeve wall 111, and the flange 113 overlaps the top of the outer sleeve 12. Specifically, the flange 113 can be annular, or multiple, and evenly distributed across the top of the sleeve wall 111. Correspondingly, a groove is provided at the top of the outer sleeve 12, and the flange 113 can overlap the groove. The provision of the flange 113 facilitates the placement of the inner sleeve 11 within the outer sleeve 12.

[0044] It should be noted that the top of the outer sleeve 12 is provided with an outwardly extending extension portion, through which the outer sleeve 12 can be placed inside the mold core 600. In addition, in order to prevent the outer sleeve 12 from rotating in the mold core 600, features such as protrusions 122 can be provided on the outer side wall of the outer sleeve 12 to form a limit.

[0045] Furthermore, along the length of the sleeve 1, seals 3 are provided on both sides of the notch 123, sandwiched between the sleeve 1 and the mold core 600. These seals 3 prevent the cooling medium from leaking from the cooling channel into the molding cavity. In other feasible embodiments, the outer sleeve 12 may have a variable diameter along its length. In this case, to prevent cooling medium leakage, seals 3 should also be provided on both sides of any variable diameter location of the outer sleeve 12. The seals 3 are preferably made of a material with good water absorption properties.

[0046] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A cooling jacket for reducing the temperature of a product at an injection port adjacent to a mold core (600), characterized in that: The cooling sleeve (100) comprises a sleeve body (1), the sleeve body (1) is made of a heat-insulating material, and / or the sleeve body (1) has a heat-insulating structure, the sleeve body (1) is arranged on the mold core (600), and the sleeve body (1) is arranged opposite to the injection port, and a cooling channel can be formed between the peripheral wall of the sleeve body (1) and the mold core (600), and a cooling medium flows inside the cooling channel; the sleeve body (1) comprises: An inner sleeve (11), the inner sleeve (11) comprising an annular sleeve wall (111) and an annular sleeve seat (112), the sleeve wall (111) and the sleeve seat (112) forming a barrel shape, and the inner sleeve (11) being made of a heat-insulating material; and An outer sleeve (12), the outer sleeve (12) is shaped like the inner sleeve (11), the outer sleeve (12) is arranged on the mold core (600), the inner sleeve (11) is sleeved inside the outer sleeve (12), and a heat-insulating cavity (13) is formed between the outer sleeve (12) and the inner sleeve (11), a flow port (121) is provided at the bottom of the outer sleeve (12), the flow port (121) and the center of the sleeve seat (112) are both arranged opposite to the injection port; the heat-insulating cavity (13) is partially located above the cooling channel.

2. The cooling jacket according to claim 1, characterized in that The sleeve wall (111) comprises a connecting portion (1111) and a cavity side portion (1112) arranged above and below, the connecting portion (1111) is connected to the inner wall of the outer sleeve (12), and the heat-insulating cavity (13) is located between the cavity side portion (1112) and the inner wall of the outer sleeve (12).

3. The cooling jacket according to claim 1, wherein: The cooling jacket (100) further comprises a heat insulator (2), wherein the heat insulator (2) is arranged between the inner jacket (11) and the outer jacket (12), and is arranged around the axis of the flow port (121).

4. The cooling jacket according to claim 1, wherein: The top of the sleeve wall (111) is provided with a flange (113), and the flange (113) is overlapped with the top of the outer sleeve (12).

5. The cooling jacket according to claim 1, characterized in that The material of the inner sleeve (11) is titanium alloy.

6. The cooling jacket according to claim 1, characterized in that Along the length direction of the sleeve (1), sealing bodies (3) are provided on both sides of the cooling channel, and the sealing bodies (3) are clamped between the sleeve (1) and the mold core (600).

7. A hot runner system, comprising a hot runner body (200), a hot nozzle core (300), a valve needle (400) and a hot nozzle cover (500), wherein the hot nozzle cover (500) is arranged at the end of the hot runner body (200) and is arranged opposite to the injection port, the hot nozzle core (300) is sleeved inside the hot nozzle cover (500), and the valve needle (400) is arranged on the hot nozzle core (300), characterized in that: The hot runner system further comprises a cooling jacket (100) as claimed in any one of claims 1 to 6, and the cooling jacket (100) can be sleeved on the outside of the hot runner body (200).

8. The hot runner system according to claim 7, characterized in that: The sleeve body (1) includes an inner sleeve (11) and an outer sleeve (12), the inner sleeve (11) includes an annular sleeve wall (111) and an annular sleeve seat (112), the sleeve wall (111) and the sleeve seat (112) form a barrel shape, and the inner sleeve (11) is made of a heat-insulating material; the outer sleeve (12) is shaped like the inner sleeve (11), the outer sleeve (12) is arranged on the mold core (600), the inner sleeve (11) is sleeved inside the outer sleeve (12), and a heat-insulating cavity (13) is formed between the outer sleeve (12) and the inner sleeve (11), the bottom of the outer sleeve (12) is provided with a flow port (121), the centers of the flow port (121) and the sleeve seat (112) are both arranged opposite to the injection port; The cooling jacket (100) further comprises a heat insulator (2), wherein the heat insulator (2) is arranged in the heat insulation cavity (13) and is sleeved on the outer side of the hot nozzle cover (500).

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