A spiral hot runner hot nozzle and injection molding apparatus using the same

Abstract

The utility model discloses a kind of spiral hot runner hot nozzle and injection molding device using it, spiral hot runner hot nozzle includes heating pipe, nozzle core, nozzle core fixing piece and valve needle;Heating pipe is equipped with first hot runner along X axis direction, and nozzle core mounting cavity is equipped in the discharge end of first hot runner;Nozzle core fixing piece is sleeved in the outer periphery of nozzle core, and nozzle core fixing piece and the side wall of nozzle core mounting cavity are detachably connected, and nozzle core fixing piece fixes nozzle core in nozzle core mounting cavity;Second hot runner is equipped in nozzle core, and second hot runner includes valve needle channel and several spiral channels that are interconnected;Valve needle passes through first hot runner and valve needle channel in turn, and is worn from the discharge port of nozzle core. The spiral hot runner hot nozzle is equipped with valve needle channel and several spiral channels in nozzle core, and the contact area of second hot runner is increased by spiral channel, and the flow distance of molten plastic is prolonged, so that molten plastic can be heated sufficiently, and molten plastic is heated uniformly, avoid that molten plastic temperature is not uniform, and affect injection molding effect.

Description

Technical Field

[0001] This utility model relates to the field of thermoplastic processing parts, and in particular to a spiral hot runner nozzle and an injection molding device using the same. Background Technology

[0002] Hot runner technology uses heating to keep the plastic in the runner and gate molten for injection molding. Existing needle valve hot runners use a single-hole direct-injection structure, injecting the product through a single orifice. However, in existing single-hole direct-injection hot runner structures, the molten plastic near the sidewall of the hot runner is closer to the heating element and therefore has a slightly higher temperature than the molten plastic in the center of the hot runner. This uneven molten plastic temperature affects the injection molding effect. Utility Model Content

[0003] The purpose of this invention is to provide a spiral hot runner nozzle and an injection molding device using it, so as to solve the problem of uneven heating of the needle valve type hot nozzle.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This utility model provides a spiral hot runner nozzle, including a heating tube, a nozzle core, a nozzle core fixing component, and a valve needle;

[0006] The heating tube is provided with a first hot runner along the X-axis direction, and the discharge end of the first hot runner is provided with a nozzle mounting cavity; the nozzle fixing member is sleeved on the outer periphery of the nozzle, and the nozzle fixing member is detachably connected to the side wall of the nozzle mounting cavity, and the nozzle fixing member fixes the nozzle to the nozzle mounting cavity.

[0007] The nozzle core is provided with a second hot runner that communicates with the first hot runner. The second hot runner includes a valve needle channel and several spiral channels that communicate with each other. The valve needle channel is arranged along the X-axis and is coaxial with the first hot runner. The several spiral channels are arranged around the outer periphery of the valve needle channel with the axis of the valve needle channel as the spiral axis.

[0008] The diameter of the valve needle is adapted to the inner diameter of the valve needle channel; the valve needle passes through the first hot runner and the valve needle channel in sequence, and exits from the discharge port of the nozzle.

[0009] In the spiral hot runner nozzle, a fixed boss is provided on the outer periphery of the nozzle core feed end. The end of the fixed boss facing away from the discharge port is tightly abutted against the nozzle core mounting cavity. The nozzle core fixing member is tightly abutted against the end of the fixed boss facing the discharge port. The side wall of the fixed boss and the side wall of the nozzle core fixing member are in contact with the inner wall of the nozzle core mounting cavity.

[0010] In the spiral hot runner nozzle, the nozzle core fixing component includes an integrally formed fixing cylinder and a hexagonal boss, and the hexagonal boss is disposed on the side wall of the middle part of the fixing cylinder.

[0011] One end of the fixed cylinder is detachably connected to the nozzle mounting cavity, the other end of the fixed cylinder extends out of the nozzle mounting cavity, and the end of the heating tube abuts against the hexagonal boss.

[0012] In the spiral hot runner nozzle, the nozzle core fixing component is made of beryllium copper.

[0013] In the spiral hot runner nozzle, the side wall of the heating tube is provided with a spiral groove, which is wound around the outer circumference of the heating tube with the axis of the heating tube as the spiral axis; the spiral groove is used to install the heating wire.

[0014] In the spiral hot runner nozzle, the heating tube includes an integrally formed nozzle fixing part, a transition part, and a nozzle core fixing part;

[0015] The outer diameter of the hot nozzle fixing part is larger than the outer diameter of the nozzle core fixing part. One end of the transition part is connected to the hot nozzle fixing part, and the other end of the transition part is connected to the nozzle core fixing part. The outer diameter of the transition part gradually decreases along the direction from the hot nozzle fixing part to the nozzle core fixing part.

[0016] The nozzle fixing part is disposed in the nozzle mounting cavity, and the hot nozzle fixing part, the transition part and the nozzle fixing part cooperate to form a first hot flow channel.

[0017] In the spiral hot runner nozzle, the spacing between the spiral grooves located in the nozzle fixing part is greater than the spacing between the spiral grooves located in the nozzle core fixing part, and the spacing between the spiral grooves located in the nozzle fixing part is the same as the spacing between the spiral grooves located in the transition part.

[0018] This utility model also provides an injection molding device, which uses the above-mentioned spiral hot runner nozzle.

[0019] One of the technical solutions of this utility model can have the following beneficial effects:

[0020] The spiral hot runner nozzle has a valve needle channel and several spiral channels in the nozzle core. The spiral channels increase the contact area of ​​the second hot runner and extend the flow path of the molten plastic, so that the molten plastic can be fully heated and heated evenly, avoiding uneven temperature of the molten plastic, which would affect the injection molding effect. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of one embodiment of the present utility model;

[0022] Figure 2This is a cross-sectional schematic diagram of one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the heating tube in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the nozzle core in one embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram showing the connection relationship between the nozzle core and the nozzle core fixing member in one embodiment of this utility model;

[0026] In the attached diagram: 1. Heating tube; 2. Nozzle core; 3. Nozzle core fixing component; 4. Valve needle.

[0027] First hot runner 10; nozzle mounting cavity 11; spiral groove 12; second hot runner 21; fixing boss 22; fixing cylinder 31; hexagonal boss 32;

[0028] Valve needle channel 211, spiral channel 212; hot nozzle fixing part 101, transition part 102, nozzle core fixing part 103. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis.

[0031] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please refer to Figures 1-5 This utility model provides a spiral hot runner nozzle, including a heating tube 1, a nozzle core 2, a nozzle core fixing component 3, and a valve needle 4;

[0034] The heating tube 1 is provided with a first hot runner 10 along the X-axis direction, and the discharge end of the first hot runner 10 is provided with a nozzle mounting cavity 11; the nozzle fixing member 3 is sleeved on the outer periphery of the nozzle 2, and the nozzle fixing member 3 is detachably connected to the side wall of the nozzle mounting cavity 11, and the nozzle fixing member 3 fixes the nozzle 2 to the nozzle mounting cavity 11.

[0035] The nozzle core 2 is provided with a second hot runner 21 that communicates with the first hot runner 10. The second hot runner 21 includes a valve needle channel 211 and a plurality of spiral channels 212 that are interconnected. The valve needle channel 211 is arranged along the X-axis and is coaxial with the first hot runner 10. The plurality of spiral channels 212 are arranged around the outer periphery of the valve needle channel 211 with the axis of the valve needle channel 211 as the spiral axis.

[0036] The diameter of the valve needle 4 is adapted to the inner diameter of the valve needle channel 211; the valve needle 4 passes through the first hot flow channel 10 and the valve needle channel 211 in sequence, and exits from the discharge port of the nozzle core 2.

[0037] Heating tube 1 is used to heat and maintain the temperature of the molten plastic in the first hot runner 10 and the second hot runner 21. Nozzle 2 cooperates with valve needle 4 to control or stop the flow of molten plastic; valve needle 4 is connected to the drive end of an external cylinder, which controls the movement of valve needle 4. The first hot runner 10 is connected to the outlet of the molten plastic. Molten plastic flows into the first hot runner 10 from the inlet of heating tube 1, and then flows from the first hot runner 10 to the spiral channel 212. Nozzle fixing member 3 is used to fix nozzle 2 to heating tube 1.

[0038] When molten plastic needs to flow out, the drive end of the cylinder controls the valve needle 4 to move upward, pulling the lower end of the valve needle 4 out of the valve needle channel 211, thereby connecting the outlet of the nozzle core 2 with the outside. The molten plastic flows into the valve needle channel 211 from the spiral channel 212 and is discharged from the spiral hot runner nozzle through the valve needle channel 211. When it is necessary to stop the flow of molten plastic, the drive end of the cylinder controls the valve needle 4 to move downward, the lower end of the valve needle 4 is reinserted into the valve needle channel 211, and the outlet is blocked, preventing the molten plastic from continuing to flow out.

[0039] The spiral hot runner nozzle has a valve needle channel 211 and several spiral channels 212 in the nozzle core 2. The spiral channels 212 increase the contact area of ​​the second hot runner 21 and extend the flow path of the molten plastic, so that the molten plastic can be fully heated and uniformly heated, avoiding uneven temperature of the molten plastic and affecting the injection molding effect.

[0040] Specifically, a fixed boss 22 is provided on the outer periphery of the feed end of the nozzle core 2. The end of the fixed boss 22 facing away from the discharge port is tightly abutted against the nozzle core mounting cavity 11. The nozzle core fixing member 3 is tightly abutted against the end of the fixed boss 22 facing the discharge port. The side wall of the fixed boss 22 and the side wall of the nozzle core fixing member 3 are in contact with the inner wall of the nozzle core mounting cavity 11.

[0041] With the above structure, the nozzle core fixing member 3 fixes the nozzle core 2 to the nozzle core mounting cavity 11 through the fixing boss 22, which prevents molten plastic from leaking out from the assembly gap between the nozzle core 2 and the heating tube 1 and improves the stability of the spiral hot runner nozzle.

[0042] Specifically, the nozzle core fixing member 3 includes an integrally formed fixing cylinder 31 and a hexagonal boss 32, wherein the hexagonal boss 32 is disposed on the side wall of the middle part of the fixing cylinder 31;

[0043] One end of the fixed cylinder 31 is detachably connected to the nozzle mounting cavity 11, and the other end of the fixed cylinder 31 extends out of the nozzle mounting cavity 11. The end of the heating tube 1 is tightly abutted against the hexagonal boss 32.

[0044] The fixed cylinder 31 is cylindrical, and the hexagonal boss 32 is hexagonal cylindrical. The structure of the hexagonal boss 32 provides better torque transmission efficiency. During operations requiring manual or automatic tools for tightening or loosening, the hexagonal shape provides a larger contact surface than a circle, thus transmitting torque more effectively. The nozzle core 2 can be connected to the heating tube 1 via the nozzle core retainer 3, and the first hot runner 10 can be connected to the second hot runner 21, preventing molten plastic from leaking out from the assembly gap between the nozzle core 2 and the heating tube 1, thereby improving the stability and reliability of the spiral hot runner nozzle.

[0045] In one specific embodiment of this utility model, a snap-fit ​​structure is provided on one end sidewall of the fixed cylinder 31 and the nozzle mounting cavity 11, respectively, and the fixed cylinder 31 and the nozzle mounting cavity 11 are detachably connected through the snap-fit ​​structure. In another specific embodiment, a thread is provided on one end sidewall of the fixed cylinder 31 and the nozzle mounting cavity 11, respectively, and the fixed cylinder 31 and the nozzle mounting cavity 11 are detachably connected through the threaded connection.

[0046] Preferably, the nozzle core fixing member 3 is made of beryllium copper.

[0047] Due to its high strength, elasticity, wear resistance, fatigue resistance, and heat resistance, beryllium copper is an excellent thermal conductive material. It can effectively transfer heat from the nozzle retainer 3 to the mold and nozzle 2, thereby shortening the injection molding cycle and improving production efficiency. At the same time, beryllium copper maintains good stability and durability during the continuous high-temperature and high-pressure injection molding process, extending the service life of the spiral hot runner nozzle.

[0048] Optionally, the side wall of the heating tube 1 is provided with a spiral groove 12, which is wound around the outer periphery of the heating tube 1 with the axis of the heating tube 1 as the spiral axis; the spiral groove 12 is used to install the heating wire.

[0049] The heating wire is installed in the spiral groove 12, which is spirally arranged on the side wall of the heating tube 1. This allows the heating wire to be evenly distributed on the outside of the heating tube 1, forming a more uniform heat flow distribution. The heat diffuses better inside the tube, making the temperature distribution of the first heat flow channel 10 and the second heat flow channel 21 more uniform, avoiding local overheating or uneven temperature, thereby improving the overall heating efficiency.

[0050] Furthermore, the heating tube 1 includes an integrally formed hot nozzle fixing part 101, a transition part 102, and a nozzle core fixing part 103;

[0051] The outer diameter of the hot nozzle fixing part 101 is larger than the outer diameter of the nozzle core fixing part 103. One end of the transition part 102 is connected to the hot nozzle fixing part 101, and the other end of the transition part 102 is connected to the nozzle core fixing part 103. The outer diameter of the transition part 102 gradually decreases along the direction from the hot nozzle fixing part 101 to the nozzle core fixing part 103.

[0052] The nozzle fixing part 103 is disposed in the nozzle mounting cavity 11, and the hot nozzle fixing part 101, the transition part 102 and the nozzle fixing part 103 cooperate to form the first hot flow channel 10.

[0053] The heating tube 1 consists of three parts: a heating nozzle fixing part 101, a transition part 102, and a nozzle core fixing part 103. The heating nozzle fixing part 101 has a large outer diameter, which increases the strength of the heating tube 1, helps support the first hot flow channel 10, and reduces the risk of deformation or damage to the heating tube 1 due to external forces or gravity during use. The nozzle core fixing part 103 has a smaller outer diameter, which allows for more concentrated heat and improves heating efficiency. The transition part 102 connects the heating nozzle fixing part 101 and the nozzle core fixing part 103, making the connection between them smoother.

[0054] Furthermore, the spacing of the spiral grooves 12 located in the hot nozzle fixing part 101 is greater than the spacing of the spiral grooves 12 located in the nozzle core fixing part 103, and the spacing of the spiral grooves 12 located in the hot nozzle fixing part 101 is the same as the spacing of the spiral grooves 12 located in the transition part 102.

[0055] The structure of the second hot runner 21 is relatively complex, making it difficult to clean once the molten plastic solidifies within it. With the above structure, the spacing of the spiral grooves 12 in the transition section 102 is smaller, and the heating wires are more tightly packed, allowing for more concentrated heat and improved heating efficiency. This also prevents the molten plastic from solidifying in the second hot runner 21.

[0056] This invention also provides an injection molding device that uses the aforementioned spiral hot runner nozzle.

[0057] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A spiral hot runner nozzle, characterized in that, Includes heating element, nozzle core, nozzle core fixing component and valve needle; The heating tube is provided with a first hot runner along the X-axis direction, and the discharge end of the first hot runner is provided with a nozzle mounting cavity; the nozzle fixing member is sleeved on the outer periphery of the nozzle, and the nozzle fixing member is detachably connected to the side wall of the nozzle mounting cavity, and the nozzle fixing member fixes the nozzle to the nozzle mounting cavity. The nozzle core is provided with a second hot runner that communicates with the first hot runner. The second hot runner includes a valve needle channel and several spiral channels that communicate with each other. The valve needle channel is arranged along the X-axis and is coaxial with the first hot runner. The several spiral channels are arranged around the outer periphery of the valve needle channel with the axis of the valve needle channel as the spiral axis. The diameter of the valve needle is adapted to the inner diameter of the valve needle channel; the valve needle passes through the first hot runner and the valve needle channel in sequence, and exits from the discharge port of the nozzle.

2. The spiral hot runner nozzle according to claim 1, characterized in that, The outer periphery of the feed end of the nozzle is provided with a fixed boss. The end of the fixed boss facing away from the discharge port is tightly abutted against the nozzle mounting cavity. The nozzle fixing member is tightly abutted against the end of the fixed boss facing the discharge port. The side wall of the fixed boss and the side wall of the nozzle fixing member are in contact with the inner wall of the nozzle mounting cavity.

3. A spiral hot runner nozzle according to claim 1, characterized in that, The nozzle core fixing component includes an integrally formed fixing cylinder and a hexagonal boss, wherein the hexagonal boss is disposed on the side wall of the middle part of the fixing cylinder; One end of the fixed cylinder is detachably connected to the nozzle mounting cavity, the other end of the fixed cylinder extends out of the nozzle mounting cavity, and the end of the heating tube abuts against the hexagonal boss.

4. A spiral hot runner nozzle according to claim 1, characterized in that, The nozzle core fixing component is made of beryllium copper.

5. A spiral hot runner nozzle according to claim 1, characterized in that, The heating tube has a spiral groove on its side wall, and the spiral groove is wound around the outer circumference of the heating tube with the axis of the heating tube as the spiral axis; the spiral groove is used to install the heating wire.

6. A spiral hot runner nozzle according to claim 5, characterized in that, The heating tube includes an integrally formed heating nozzle fixing part, a transition part, and a nozzle core fixing part; The outer diameter of the hot nozzle fixing part is larger than the outer diameter of the nozzle core fixing part. One end of the transition part is connected to the hot nozzle fixing part, and the other end of the transition part is connected to the nozzle core fixing part. The outer diameter of the transition part gradually decreases along the direction from the hot nozzle fixing part to the nozzle core fixing part. The nozzle fixing part is disposed in the nozzle mounting cavity, and the hot nozzle fixing part, the transition part and the nozzle fixing part cooperate to form a first hot flow channel.

7. A spiral hot runner nozzle according to claim 6, characterized in that, The spacing between the spiral grooves in the hot nozzle fixing part is greater than the spacing between the spiral grooves in the nozzle core fixing part, and the spacing between the spiral grooves in the hot nozzle fixing part is the same as the spacing between the spiral grooves in the transition part.

8. An injection molding device, characterized in that, The injection molding apparatus uses the spiral hot runner nozzle as described in any one of claims 1 to 7.

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