Nozzle device capable of preventing cold charge from remaining

Abstract

The utility model discloses a nozzle device capable of preventing cold charge from remaining, the nozzle device capable of preventing cold charge from remaining comprises a nozzle main body, a feeding hole and a discharging hole opposite to the feeding hole are formed in the nozzle main body, the feeding hole and the discharging hole are communicated through a melt channel, and the melt channel is communicated with the nozzle main body. A spraying section is defined at the position, close to the discharging hole, of the melt channel, the spraying section is communicated with the discharging hole, the inner diameter of the spraying section is smaller than the inner diameter of the feeding section and the inner diameter of the heating section, and the spraying section inclines by a preset angle at the position away from the discharging hole by a preset distance; the spraying section is arranged in the discharging hole, so that the inner diameter of the spraying section in the direction towards the discharging hole is gradually increased and is in a radial shape, and the inner diameter of the discharging hole is larger than that of the spraying section.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machine nozzles, in particular to a nozzle device capable of preventing cold material from remaining. Background Art

[0002] An injection molding machine is a device used to manufacture plastic products. It can meet the production needs of plastic products of various shapes and sizes, such as plastic containers, toys, and electrical appliance housings. The injection molding machine first heats solid plastic to a molten state, then applies high pressure to inject the molten plastic into the mold cavity for cooling and shaping, and finally forms a plastic product that meets production requirements. Among them, the injection system is one of the most critical parts of the injection molding machine, and the injection system consists of multiple components such as a nozzle, a heater, and a screw.

[0003] During the injection process, in order to prevent salivation (the phenomenon of molten plastic flowing out of the hole at the front end of the nozzle), the operator usually lowers the temperature of the front end of the nozzle. When the temperature of the mold surface is too low, part of the heat at the front end of the nozzle will also be dispersed by the mold, causing the molten plastic passing through the front end of the nozzle to become solidified or semi-solidified plastic due to the low temperature. This is cold material. Cold material generally appears as poor gloss or jetting marks on the surface of the molded plastic product, which reduces the quality of the plastic product. Therefore, it is necessary to set a cold material receiving container at the root of the main channel and the branch channel on one side of the mold cavity to prevent cold material from entering the mold cavity.

[0004] In theory, the purpose of preventing cold material and drooling can be achieved by increasing the temperature of the mold and the nozzle at the same time, but the temperature range is difficult to control, which undoubtedly increases the difficulty of operation. In the prior art, the inside of the nozzle is set as a straight section, which not only makes it difficult to ensure that the cold material can be smoothly pushed out from the front end of the nozzle every time, but also after long-term use, a small amount of cold material will accumulate in the nozzle, thereby reducing the effect of the next injection. In severe cases, the cold material will be directly pulled off inside the nozzle, affecting the injection process of the entire injection molding machine. Utility Model Content

[0005] In order to solve the above technical problems and achieve at least one advantage of the utility model, the utility model provides a nozzle device capable of preventing cold material from remaining, and the nozzle device capable of preventing cold material from remaining comprises:

[0006] A nozzle body, wherein the nozzle body forms a feed hole and a discharge hole opposite to the feed hole, the feed hole and the discharge hole are connected via a melt channel, the melt channel defines a spray section at a position close to the discharge hole, the spray section and the discharge hole are connected, the inner diameter of the spray section is smaller than the inner diameters of the feed section and the heating section, and the spray section is inclined at a predetermined angle at a predetermined distance away from the discharge hole, so that the inner diameter of the spray section gradually increases radially in the direction toward the discharge hole, and the inner diameter of the discharge hole is larger than the inner diameter of the spray section.

[0007] According to an embodiment of the present invention, the melt channel defines a feed section at a position close to the feed hole, the feed section is communicated with the feed hole, and the melt channel defines a heating section between the feed section and the injection section.

[0008] According to an embodiment of the present invention, the nozzle body is made of a material with high heat resistance and corrosion resistance to prevent the molten plastic from melting or corroding the nozzle body during the injection process.

[0009] According to an embodiment of the present invention, the nozzle body defines a nozzle end, and the feed hole is arranged close to the nozzle end.

[0010] According to an embodiment of the utility model, the nozzle device capable of preventing cold material residue also includes a heating component, which is installed on the nozzle body to heat the molten plastic in the melt channel so that the molten plastic always remains in a molten state.

[0011] According to an embodiment of the utility model, the heating assembly includes a heating coil, which is sleeved on the nozzle end and arranged close to the feed hole to continuously heat the molten plastic flowing to the nozzle end.

[0012] According to an embodiment of the utility model, the inner wall of the injection section is configured to be polished to reduce the friction of the molten plastic and the cold material formed after the molten plastic is cooled through the injection section, and reduce the resistance of the cold material through the discharge hole.

[0013] According to an embodiment of the utility model, the heating component further comprises a heating wire, and the heating wire is arranged to be evenly distributed in the heating section of the melt channel. When the heating wire is heated, the temperature of the heating section increases.

[0014] According to one embodiment of the utility model, the nozzle device that can prevent cold material residue also includes a mounting portion, and the mounting portion is implemented to include an external thread that matches the internal thread of the nozzle mounting hole of the injection molding machine, so that the nozzle device that can prevent cold material residue can be detachably mounted to the injection molding machine through the mounting portion.

[0015] According to an embodiment of the present invention, the inner diameter of the injection section is smaller than the inner diameters of the feeding section and the heating section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a nozzle device capable of preventing cold material from remaining according to the utility model is shown.

[0017] Figure 2 A stereoscopic view of a nozzle device capable of preventing cold material from remaining according to the utility model is shown.

[0018] Figure 3 A cross-sectional view of the injection molding process of the nozzle device capable of preventing cold material residue according to the utility model is shown.

[0019] Figure 4 An exploded view of the nozzle device of the utility model capable of preventing cold material from remaining is shown. DETAILED DESCRIPTION

[0020] The following description is used to disclose the utility model so that operators in the field can implement the utility model. The preferred embodiments described below are only examples, and operators in the field can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other implementation schemes, variations, improvements, equivalent schemes, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0021] Operators in the field should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0022] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0023] refer to Figures 1 to 4 The nozzle device capable of preventing cold material residue according to a preferred embodiment of the utility model is described in detail below. The nozzle device capable of preventing cold material residue is installed on an injection molding machine, and the molten plastic in the injection molding machine is injected into a mold cavity 900 through the nozzle device capable of preventing cold material residue for molding.

[0024] It is understandable that, during the process of the molten plastic being injected from the injection molding machine into the mold cavity 900 through the nozzle device capable of preventing cold material from remaining, part of the molten plastic may cool down to form solid or semi-solid cold material.

[0025] The mold cavity 900 defines an injection hole 901. The nozzle device capable of preventing cold material from remaining can smoothly bring the cold material generated during the injection process to the injection hole 901 during the injection process aimed at the injection hole 901 of the mold cavity 900, thereby preventing the cold material from accumulating or breaking inside the nozzle device capable of preventing cold material from remaining and affecting the secondary injection.

[0026] Specifically, the nozzle device capable of preventing cold material residue comprises a nozzle body 10. The nozzle body 10 is made of a material with high heat resistance and corrosion resistance to prevent the molten plastic from melting or corroding the nozzle body 10 during the injection process.

[0027] The nozzle body 10 defines a nozzle end 11. The nozzle body 10 forms a feed hole 101 and a discharge hole 102 opposite to the feed hole 101, and the feed hole 101 is arranged close to the nozzle end 11. The feed hole 101 and the discharge hole 102 are connected through a melt channel 103.

[0028] During the injection operation, the nozzle end 11 is arranged to align with the injection hole 901 of the mold cavity 900, and the discharge hole 102 is connected to the injection hole 901. In this way, the molten plastic in the injection molding machine can flow from the feed hole 101 into the melt channel 103, and flow out of the discharge hole 102 along the melt channel 103, and finally flow into the mold cavity 900 through the injection hole 901 connected to the discharge hole 102 for molding and shaping.

[0029] It is understandable that there is a temperature difference between the nozzle end 11 and the mold cavity 900. According to the principle of heat conduction, when the nozzle end 11 contacts the mold cavity 900, the heat of the higher temperature nozzle end 11 will be absorbed by the lower temperature mold cavity 900, so that the temperature of the nozzle end 11 is reduced, and the molten plastic flowing to the nozzle end 11 is easily cooled to form cold material.

[0030] Furthermore, the nozzle device capable of preventing cold material residue further comprises a heating assembly 20. The heating assembly 20 is mounted on the nozzle body 10 to heat the molten plastic so that the molten plastic in the nozzle body 10 is always kept in a molten state, and to a certain extent, the molten plastic before being injected into the mold cavity 900 can be prevented from being rapidly cooled and solidified.

[0031] The heating assembly 20 includes a heating coil 21, which is sleeved on the nozzle end 11 and arranged close to the feed hole 101, so as to continuously heat the molten plastic flowing to the nozzle end 11 and slow down the speed at which the molten plastic cools and solidifies at the nozzle end 11 to form the cold material.

[0032] Specifically, the melt channel 103 defines a feeding section 10301 at a position close to the feeding hole 101, and the feeding section 10301 is connected to the feeding hole 101. The melt channel 103 defines an injection section 10302 at a position close to the discharge hole 102, and the injection section 10302 is connected to the discharge hole 102. Further, the melt channel 103 further defines a heating section 10303 between the feeding section 10301 and the injection section 10302.

[0033] It is worth mentioning that the inner diameter of the injection section 10302 is much smaller than the inner diameters of the feeding section 10301 and the heating section 10303, and the injection section 10302 is inclined at a predetermined angle at a predetermined distance away from the discharge hole 102, so that the inner diameter of the injection section 10302 gradually increases radially in the direction toward the discharge hole 102.

[0034] In this way, by increasing the demolding slope of the inner wall of the injection section 10302, the inner diameter of the discharge hole 102 is made larger than the inner diameter of the injection section 10302. At this time, the cold material formed in the injection section 10302 can be more smoothly brought out from the discharge hole 102 by the subsequent molten plastic, and further enter the mold cavity 900 through the injection hole 901 connected to the discharge hole 102, so as to prevent the cold material from being blocked in the discharge hole 102, thereby preventing the cold material from remaining.

[0035] Specifically, during one injection process, the cold material formed by the cooling and solidification of the molten plastic through the injection section 10302 is temporarily stored in the injection section 10302. When the next injection is performed, the molten plastic flowing from the feed section 10301 to the injection section 10302 brings the cold material temporarily stored in the injection section 10302 out of the discharge hole 102, and flows into the mold cavity 900 along with the molten plastic flowing in from the feed section 10301. In this reciprocating manner, the cold material temporarily stored in the injection section 10302 can be stably and smoothly brought out of the discharge hole 102 by the subsequent molten plastic, thereby avoiding excessive accumulation of the cold material in the injection section 10302 and blocking the discharge hole 102, and preventing the cold material from breaking in the injection section 10302.

[0036] Preferably, the inner wall of the injection section 10302 is configured to be polished so that the friction of the molten plastic and the cold material formed after the molten plastic is cooled passing through the injection section 10302 is reduced, and then during the injection process, the resistance of the cold material in the injection section 10302 passing through the discharge hole 102 is reduced, so that the cold material can be more smoothly brought out of the discharge hole 102 by the subsequent molten plastic.

[0037] The heating assembly 20 further includes a heating wire 22, which is evenly distributed in the heating section 10303 of the melt channel 103. When the heating wire 22 is heated, the temperature of the heating section 10303 rises, thereby ensuring that the molten plastic entering the feeding section 10301 from the feeding hole 101 remains in a molten state without cooling and solidifying, thereby ensuring that the entire injection process proceeds smoothly.

[0038] The nozzle device capable of preventing cold material residue also includes a mounting portion 30, which is implemented as an external thread matching the internal thread of the nozzle mounting hole of the injection molding machine, so that the nozzle device capable of preventing cold material residue can be detachably mounted on the injection molding machine through the mounting portion 30.

[0039] Operators in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A nozzle device capable of preventing cold material from remaining, characterized in that: The nozzle device capable of preventing cold material from remaining comprises: A nozzle body, wherein the nozzle body forms a feed hole and an outlet hole opposite to the feed hole, the feed hole and the outlet hole are connected via a melt channel, the melt channel defines an injection section at a position close to the outlet hole, the melt channel defines a feed section at a position close to the feed hole, the feed section and the feed hole are connected, the melt channel defines a heating section between the feed section and the injection section, the injection section and the outlet hole are connected, the inner diameter of the injection section is smaller than the inner diameters of the feed section and the heating section, and the injection section is inclined at a predetermined angle at a predetermined distance away from the outlet hole, so that the inner diameter of the injection section gradually increases radially in the direction toward the outlet hole, and the inner diameter of the outlet hole is larger than the inner diameter of the injection section.

2. The nozzle device capable of preventing cold material from remaining according to claim 1, characterized in that: The nozzle body defines a nozzle end, and the feed aperture is disposed proximate the nozzle end.

3. The nozzle device capable of preventing cold material from remaining according to claim 2, characterized in that: The nozzle device capable of preventing cold material from remaining further comprises a heating component, which is installed on the nozzle body and is used for heating the molten plastic in the melt channel so that the molten plastic always remains in a molten state.

4. The nozzle device capable of preventing cold material from remaining according to claim 3, characterized in that: The heating assembly comprises a heating coil, which is sleeved on the nozzle end and arranged close to the feed hole to continuously heat the molten plastic flowing to the nozzle end.

5. The nozzle device capable of preventing cold material from remaining according to claim 4, characterized in that: The inner wall of the injection section is configured to be polished so that the friction of the molten plastic and the cold material formed after the molten plastic is cooled through the injection section is reduced, and the resistance of the cold material through the discharge hole is reduced.

6. The nozzle device capable of preventing cold material from remaining according to claim 4, characterized in that: The heating assembly further comprises a heating wire, and the heating wire is arranged to be evenly distributed in the heating section of the melt channel. When the heating wire is heated, the temperature of the heating section increases.

7. The nozzle device capable of preventing cold material from remaining according to claim 5, characterized in that: The nozzle device capable of preventing cold material residue also includes a mounting portion, which is implemented to include an external thread matching the internal thread of the nozzle mounting hole of the injection molding machine, so that the nozzle device capable of preventing cold material residue can be detachably mounted to the injection molding machine through the mounting portion.

8. The nozzle device capable of preventing cold material from remaining according to claim 7, characterized in that: The inner diameter of the injection section is smaller than the inner diameters of the feeding section and the heating section.

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