Hot nozzle assembly

Abstract

The application relates to a hot nozzle assembly, which comprises a hot nozzle with a hot runner arranged along the axial direction of the hot nozzle, a gate arranged at the bottom of the hot runner, a valve needle sleeve arranged in the hot runner, a valve needle arranged at least partially in the valve needle sleeve, and a force storage component arranged between the valve needle and the valve needle sleeve; the valve needle sleeve comprises a containing cavity coaxially arranged with the hot runner and a through channel communicated with the hot runner; when the valve needle is subjected to the fluid pressure flowing downwards through the through channel, the valve needle moves away from the gate to open the gate. The application only needs to arrange the valve needle to extend from the containing cavity to the gate to realize the opening and closing of the gate, the size of the valve needle is smaller than that of the valve needle penetrating through the whole hot runner in the prior art, and a driving mechanism is not needed to drive the movement of the valve needle, so that the application has the advantages of simple structure and cost reduction.

Description

Technical Field

[0001] This invention relates to the field of mold processing, and in particular to hot runner assemblies. Background Technology

[0002] Currently, the most commonly used injection molds in the injection molding industry are hot runner injection molds. Compared with ordinary molds, plastic products injection molded through hot runner systems are of higher quality, and hot runner systems have advantages such as saving raw materials, improving production efficiency, and high degree of automation.

[0003] In existing technologies, hot runner assemblies control the opening and closing of valve needles by driving a cylinder to move the needle up and down. Because the cylinder occupies a certain amount of installation space, hot runner injection molds require a large installation space to mount the hot runner assembly, resulting in drawbacks such as large installation space requirements, inconvenient assembly, high cost, and complex structure. Therefore, it is necessary to research a hot runner assembly to solve these problems. Summary of the Invention

[0004] The present invention aims to provide a hot nozzle assembly that is simple in structure, reduces cost, and is easy to assemble.

[0005] To achieve the above objectives, one embodiment of the present invention provides a hot nozzle assembly, including a hot nozzle having a hot runner extending along its axial direction and a gate disposed at the bottom of the hot runner. The hot nozzle assembly further includes a valve needle sleeve disposed within the hot runner, a valve needle at least partially disposed within the valve needle sleeve, and a power storage component disposed between the valve needle and the valve needle sleeve.

[0006] The valve needle sleeve includes a receiving chamber coaxially arranged with the hot runner and a through channel communicating with the hot runner, and the valve needle extends from the receiving chamber toward the gate;

[0007] When the valve needle is subjected to the pressure of the fluid flowing downward through the through-channel, it moves away from the gate to open the gate, and the energy storage component stores deformation force.

[0008] When the fluid pressure is removed, the accumulator drives the valve needle to move closer to the gate to close the gate.

[0009] As a further improvement of one embodiment of the present invention, the hot runner includes an inclined runner defined between the inner wall of the hot nozzle and the outer wall of the valve needle sleeve, and the inclined runner extends from the through channel toward the receiving chamber.

[0010] The inclined flow channel gradually approaches the axis of the receiving chamber from top to bottom.

[0011] As a further improvement of one embodiment of the present invention, the through channel includes a first end opening communicating with the hot runner, a second end opening communicating with the inclined flow channel receiving chamber, and a vertical through channel communicating with the first end opening and the second end opening, wherein the vertical through channel is arranged parallel to the receiving chamber.

[0012] As a further improvement of one embodiment of the present invention, the outer wall of the valve needle is recessed inward to form a thrust groove;

[0013] The thrust groove is located at the downstream end of the inclined flow channel.

[0014] As a further improvement of one embodiment of the present invention, the thrust groove is configured as an arc groove, and the valve needle has an arc surface forming the arc groove;

[0015] The arc surface forming the arc groove is in contact with the inclined surface forming the inclined flow channel.

[0016] As a further improvement of one embodiment of the present invention, the valve needle includes a conical structure that gradually tapers downward from the thrust groove;

[0017] The hot nozzle has a mating hole that mates with the conical structure.

[0018] As a further improvement of one embodiment of the present invention, the first end opening is provided at the top of the valve needle sleeve;

[0019] The top of the valve needle sleeve protrudes upward to form a tip, and the tip has a flow-guiding inclined surface.

[0020] As a further improvement of one embodiment of the present invention, the valve needle includes a valve needle body and an annular protrusion formed by the valve needle body extending outward.

[0021] The energy storage component is a spring;

[0022] One end of the spring abuts against the annular protrusion, and the other end of the spring abuts against the inner wall of the valve needle sleeve.

[0023] As a further improvement of one embodiment of the present invention, the valve needle sleeve is respectively formed with a first limiting groove that limits and cooperates with the annular boss, and a second limiting groove formed with the end of the valve needle body away from the gate.

[0024] As a further improvement of one embodiment of the present invention, the valve needle sleeve includes an upper cover and a base disposed opposite to each other.

[0025] The upper cover and the base together define the receiving chamber and the through passage;

[0026] The base has an extension that extends into the upper cover to engage with the upper cover.

[0027] As a further improvement of one embodiment of the present invention, the hot nozzle includes a hot nozzle body and a sprue sleeve fixed along the axial direction of the hot nozzle body to the bottom of the hot nozzle body.

[0028] The hot runner includes a first runner formed by the hot nozzle body extending along its axial direction and a second runner formed by the sprue sleeve that is coaxially connected to the first runner.

[0029] The gate is formed at the bottom of the gate sleeve.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: The hot runner assembly provided by the present invention, through a valve needle sleeve disposed in the hot runner, a valve needle at least partially disposed in the valve needle sleeve, and a force-accumulating component disposed between the valve needle and the valve needle sleeve, encloses the valve needle and the force-accumulating component in the valve needle sleeve. The valve needle sleeve is provided with a receiving chamber coaxially disposed with the hot runner and a through channel communicating with the hot runner. When the valve needle is subjected to the pressure of molten plastic flowing downward through the through channel, it moves away from the gate to open the gate. During injection molding, the impact force generated by the molten plastic pushes the valve needle upward, causing the valve needle to move away from the gate. At the same time, the force-accumulating component accumulates an upward deformation force, thereby opening the gate. When the pressure of the molten plastic is removed, the force-accumulating component drives the valve needle to move closer to the gate to close the gate. The function of opening or closing the gate can be achieved simply by extending the valve needle from the receiving chamber to the gate. The size of the valve needle is much smaller than that of the valve needle that runs through the entire hot runner in the prior art. Moreover, there is no need to set up a drive mechanism to drive the valve needle to move up and down. It has the advantages of simple structure, reduced cost and easy assembly. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the mounting structure of the hot nozzle assembly of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the hot nozzle assembly of the present invention;

[0033] Figure 3 This is an exploded structural diagram of the hot nozzle assembly of the present invention.

[0034] In the diagram: 1. Hot nozzle; 11. Hot runner; 111. Inclined runner; 12. Gate; 13. Hot nozzle body; 14. Gate sleeve; 141. Mating hole; 142. Receiving cavity; 2. Valve needle sleeve; 21. Receiving chamber; 22. Through channel; 221. First end opening; 222. Vertical through channel; 224. Second end opening; 23. Tip; 231. Guide inclined surface; 24. First limiting groove; 25. Second limiting groove; 26. Top cover; 27. Base; 271. Extension; 3. Valve needle; 31. Valve needle body; 32. Annular boss; 33. Thrust groove; 34. Conical structure; 4. Energy storage component; 5. Heater. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0036] Combination Figure 1 As shown, the present invention mainly relates to: a hot runner assembly, which includes a hot runner 1, the hot runner 1 having a hot runner 11 extending along its axial direction and a gate 12 disposed at the bottom of the hot runner 11. Molten plastic is injected into the cavity of a mold assembly that mates with the hot runner assembly through the hot runner 11 and the gate 12.

[0037] In this embodiment, the axial direction of the hot nozzle 1 is vertical.

[0038] The hot nozzle assembly also includes a valve needle sleeve 2 disposed within the hot runner 11, a valve needle 3 at least partially disposed within the valve needle sleeve 2, and a power storage component 4 disposed between the valve needle 3 and the valve needle sleeve 2. The valve needle 3 and the power storage component 4 are enclosed within the valve needle sleeve 2.

[0039] The valve needle sleeve 2 includes a receiving chamber 21 coaxially connected to the hot runner 11. A valve needle 3 extends from the receiving chamber 21 toward the gate 12. A portion of the valve needle 3 is disposed in the receiving chamber 21, and another portion extends into the hot runner 11 and toward the gate 12 to open or close the gate 12. The top of the receiving chamber 21 is not connected to the hot runner 11, and the valve needle sleeve 2 and the valve needle 3 are fitted with a small tolerance to ensure that molten plastic does not flow into the valve needle sleeve 2. The hot runner 11 includes a portion disposed above the valve needle sleeve 2 and a portion disposed below the valve needle sleeve 2.

[0040] The valve needle sleeve 2 also includes a through channel 22 communicating with the hot runner 11. The through channel 22 is disposed around the receiving chamber 21. The bottom of the valve needle 3 is subjected to fluid pressure passing through the hot runner 11 and the through channel 22, causing the gate to be in an open state. Molten plastic passes through the hot runner 11 and the through channel 22, and is finally injected through the gate 12 into the cavity of the mold assembly that mates with the hot nozzle assembly. When the valve needle 3 is subjected to fluid pressure flowing downward through the through channel 22, it moves away from the gate 12 to open the gate 12, and the force-accumulating component 4 accumulates deformation force. The through channel 22 is designed to generate an impact force on the valve needle 3 from the fluid.

[0041] In this embodiment, the fluid is molten plastic. During injection molding, the molten plastic is injected into the hot runner 11 through the top of the hot runner 11, and then flows towards the gate through the through channel 22. The impact force generated by the molten plastic pushes the valve needle 3 upward, causing the valve needle 3 to move away from the gate 12. At the same time, the force storage component 4 accumulates upward deformation force, thereby opening the gate 12. The molten plastic is injected into the cavity of the mold assembly that mates with the hot nozzle assembly through the through channel 22 and the gate 12.

[0042] When the pressure of the molten plastic is removed, the accumulator 4 drives the valve needle 3 to move toward the gate 12 to close the gate 12.

[0043] Specifically, when the injection pressure is zero at the end of the injection process, or when the injection pressure is less than the upward deformation force accumulated by the accumulator component 4, the accumulator component 4 drives the valve needle 3 to move downward, thereby closing the gate 12.

[0044] In this embodiment, the valve needle 3 only needs to extend from the receiving chamber 21 to the gate 12 to open or close the gate 12. Therefore, the size of the valve needle 3 is much smaller than that of the valve needle 3 that runs through the entire hot runner 11 in the prior art, and only a short valve needle 3 is needed. Moreover, there is no need to set a drive mechanism to move the valve needle 3 up and down, which has the advantages of simple structure and reduced cost.

[0045] Furthermore, the hot runner 11 includes an inclined flow channel 111 defined between the inner wall of the hot nozzle 1 and the outer wall of the valve needle sleeve 2, the inclined flow channel 111 extending from the through channel 22 toward the receiving chamber 21. The inclined flow channel 111 connects the through channel 22 and the receiving chamber 21.

[0046] The inclined flow channel 111 gradually approaches the axis of the receiving chamber 21 from top to bottom. The inclined flow channel 111 enhances the impact force generated when the molten plastic flows downward, thus making the impact force on the valve needle 3 stronger as the molten plastic passes through the through channel 22 and the inclined flow channel 111 in sequence. This makes it easier for the valve needle 3 to move away from the gate 12, thereby making the gate 12 open faster.

[0047] Furthermore, the inclined flow channel 111 is formed between the inner wall of the hot nozzle 1 and the lower side wall of the valve needle sleeve 2.

[0048] Combination Figure 2 As shown, the through channel 22 further includes a first end opening 221 communicating with the hot runner, a second end opening 224 communicating with the inclined flow channel 111, and a vertical through channel 222 connecting the first end opening 221 and the second end opening 224, wherein the vertical through channel 222 is arranged parallel to the receiving chamber 21.

[0049] The inclined flow channel 111 extends downward from the second end opening 224 and connects the second end opening 224 with the receiving chamber 21.

[0050] The first end opening 221 is open and exposed within the hot runner 11. The first end opening 221 is spaced apart from the upper opening of the receiving chamber 21. The vertical through channel 222 is spaced apart from the hot runner 11 in parallel. The second end opening 224 faces the hot runner 11.

[0051] The molten plastic sequentially enters through the first end opening 221, the vertical through channel 222, the second end opening 224, and the inclined flow channel 111, generating a large impact force on the valve needle 3. This makes it easier for the valve needle 3 to move away from the gate 12, thereby allowing the gate 12 to open faster.

[0052] Preferably, the connection between the vertical through channel 222 and the inclined flow channel 111 is an arc transition, which makes the liquid flow more smoothly and facilitates the smooth passage of the liquid through the inclined flow channel 111.

[0053] Combination Figure 3 As shown, further, the outer wall of the valve needle 3 is recessed inward to form a thrust groove 33. The thrust groove 33 is provided at the downstream end of the inclined flow channel 111. The downstream end of the inclined flow channel 111 is the lower end of the inclined flow channel 111.

[0054] Molten plastic flows sequentially from the first end opening 221, the vertical through channel 222, the second end opening 224, the inclined flow channel 111, and the thrust groove 33. Part of the molten plastic enters the thrust groove 33, thereby generating an upward thrust on the valve needle 3, making it easier for the valve needle 3 to move away from the gate 12, thus making the gate 12 open faster.

[0055] Furthermore, the thrust groove 33 is arranged around the valve needle 3 axially. It is formed by turning around the valve needle 3 axially during machining, thereby generating a strong thrust on the valve needle 3, making it easier for the valve needle 3 to move away from the gate 12, thus making the gate 12 open faster.

[0056] Furthermore, the thrust groove 33 is configured as an arc groove, and the valve needle 3 has an arc surface forming the arc groove.

[0057] The arc surface forming the arc groove is in contact with the inclined surface forming the inclined flow channel 111. When the molten plastic passes through the inclined flow channel 111, the molten plastic directly flows through the arc surface of the arc groove of the inclined flow channel 111, which maximizes the upward thrust generated by the arc groove, thereby generating a strong thrust on the valve needle 3. This makes it easier for the valve needle 3 to move away from the gate 12, thus making the gate 12 open faster.

[0058] Preferably, the thrust groove 33 is a semi-circular arc-shaped groove structure.

[0059] Furthermore, the valve needle 3 includes a conical structure 34 that gradually tapers downward from the self-pushing groove 33. The hot runner 1 has a mating hole 141 that mates with the conical structure 34. When the impact force generated by the molten plastic pushes the valve needle 3 upward, the conical structure 34 further promotes the upward movement of the valve needle 3 while ensuring that the valve needle 3 does not protrude excessively beyond the outside of the gate 12.

[0060] The hot nozzle 1 includes a hot nozzle body 13 and a sprue sleeve 14 fixed axially to the bottom of the hot nozzle body 13. The sprue sleeve 14 forms a mating hole 141 and surrounds the conical structure 34.

[0061] Furthermore, a first end opening 221 is provided on the top of the valve needle sleeve 2. The top of the valve needle sleeve 2 protrudes upward to form a tip 23, and the tip 23 has a flow-guiding inclined surface 231. A portion of the hot runner 11 is provided on the top of the valve needle sleeve 2.

[0062] During injection molding, molten plastic is injected into the hot runner 11 through the top opening of the hot runner 11. Then, the molten plastic flows along the guide slope 231 through the tip 23 into the first end opening 221 and into the through channel 22. The tip 23 accelerates the flow rate of the molten plastic through the first end opening 221 into the through channel 22, making it easier for the valve needle 3 to move away from the gate 12, thereby allowing the gate 12 to open faster.

[0063] Preferably, the first end opening 221 is disposed adjacent to the tip 23 and is disposed on the downstream side of the guide inclined surface 231.

[0064] Furthermore, multiple through channels 22 are provided, with the tip 23 positioned at the center of the top of the valve needle sleeve 2. The multiple through channels 22 are arranged symmetrically around the tip 23 to enhance the impact force on the valve needle 3. This makes it easier for the valve needle 3 to move away from the gate 12, thereby allowing the gate 12 to open faster.

[0065] Furthermore, the valve needle 3 includes a valve needle body 31 and an annular boss 32 formed by extending the valve needle body 31 outward. Preferably, the annular boss 32 is disposed in the middle region of the valve needle body 31.

[0066] Preferably, the energy storage component 4 is a spring.

[0067] One end of the spring abuts against the annular boss 32, and the other end of the spring abuts against the inner wall of the valve needle sleeve 2. Preferably, the other end of the spring abuts against the inner top wall of the valve needle sleeve 2.

[0068] Furthermore, the valve needle sleeve 2 forms a first limiting groove 24 that is mutually limiting and engaged with the annular boss 32, and a second limiting groove 25 that is formed with the end of the valve needle body 31 facing away from the gate 12. The extreme position of the downward movement of the valve needle 3 is when the annular boss 32 is in limiting contact with the first limiting groove 24, and the extreme position of the upward movement of the valve needle 3 is when the end of the valve needle body 31 facing away from the gate 12 is in limiting contact with the second limiting groove 25. The valve needle 3 moves downward to close the gate 12, and moves upward to open the gate 12.

[0069] Furthermore, the valve needle sleeve 2 includes an upper cover 26 and a base 27 disposed opposite to each other. The upper cover 26 and the base 27 together define a receiving chamber 21 and a through channel 22. The base 27 has an extension 271 that extends into the upper cover 26 for installation in conjunction with the upper cover 26. The valve needle sleeve 2, with its separate upper cover 26 and base 27, facilitates the installation of the valve needle 3.

[0070] Furthermore, the hot nozzle 1 includes a hot nozzle body 13 and a sprue sleeve 14 fixed axially to the bottom of the hot nozzle body 13. The sprue sleeve 14 is coaxially arranged with the hot nozzle body 13, ensuring the structural stability and balance of the hot nozzle assembly.

[0071] The hot runner 11 includes a first runner formed by the hot nozzle body 13 extending axially therefrom, and a second runner formed by the sprue sleeve 14 coaxially communicating with the first runner. The upper part of the sprue sleeve 14 is recessed downward to form a receiving cavity 142 for receiving a portion of the hot nozzle body 13. The bottom of the sprue sleeve 14 forms a sprue 12.

[0072] Furthermore, the hot nozzle assembly also includes a heater 5 fitted onto the outer wall of the hot nozzle body 13. The heater 5 heats and controls the temperature of the injection plastic, allowing the molten plastic to be poured into the cavity of the mold assembly through the hot runner 11 and the gate 12, thus preventing the formation of solidified material in the gating system.

[0073] To address the aforementioned problems, the present invention also provides a mold.

[0074] A mold includes a hot nozzle assembly as described above.

[0075] Compared to existing technologies, the hot runner assembly provided by this invention encloses the valve needle 3 and the energy storage component 4 within the valve needle sleeve 2, which is disposed within the hot runner 11. The valve needle sleeve 2 has a receiving chamber 21 coaxially arranged with the hot runner 11 and a through channel 22 communicating with the hot runner 11. When the valve needle 3 is subjected to the pressure of molten plastic flowing downward through the through channel 22, it moves away from the gate 12 to open the gate 12. During injection molding, the impact force generated by the molten plastic pushes the valve needle 3 upward, causing it to move away from the gate 12. At the same time, the energy storage component 4 accumulates an upward deformation force, thereby opening the gate 12. When the pressure of the molten plastic is removed, the energy storage component 4 drives the valve needle 3 to move closer to the gate 12 to close the gate 12. The function of opening or closing the gate 12 can be achieved simply by extending the valve needle 3 from the receiving chamber 21 to the gate 12. The size of the valve needle 3 is much smaller than that of the valve needle 3 that runs through the entire hot runner 11 in the prior art, and there is no need to set a drive mechanism to drive the valve needle 3 to move up and down. It has the advantages of simple structure, reduced cost and easy assembly.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A hot runner assembly, comprising a hot runner having a hot runner channel extending along its axial direction and a gate disposed at the bottom of the hot runner channel, characterized in that, The hot nozzle assembly further includes a valve needle sleeve disposed in the hot runner, a valve needle at least partially disposed in the valve needle sleeve, and a power storage component disposed between the valve needle and the valve needle sleeve; The valve needle sleeve includes a receiving chamber coaxially arranged with the hot runner and a through channel communicating with the hot runner, and the valve needle extends from the receiving chamber toward the gate; When the valve needle is subjected to the pressure of the fluid flowing downward through the through-channel, it moves away from the gate to open the gate, and the energy storage component stores deformation force. When the fluid pressure is removed, the accumulator drives the valve needle to move toward the gate to close the gate; The hot runner includes an inclined runner defined between the inner wall of the hot nozzle and the outer wall of the valve needle sleeve, the inclined runner extending from the through channel toward the receiving chamber; wherein, the inclined runner gradually converges toward the axis of the receiving chamber in a downward direction. The outer wall of the valve needle is recessed inward to form a thrust groove; The thrust groove is located at the downstream end of the inclined flow channel.

2. The hot nozzle assembly according to claim 1, characterized in that: The through channel includes a first end opening communicating with the hot runner, a second end opening communicating with the inclined flow channel receiving chamber, and a vertical through channel connecting the first end opening and the second end opening, wherein the vertical through channel is arranged parallel to the receiving chamber.

3. The hot nozzle assembly according to claim 1, characterized in that: The thrust groove is configured as an arc groove, and the valve needle has an arc surface forming the arc groove; The arc surface forming the arc groove is in contact with the inclined surface forming the inclined flow channel.

4. The hot nozzle assembly according to claim 1, characterized in that: The valve needle includes a conical structure that gradually tapers downward from the thrust groove; The hot nozzle has a mating hole that mates with the conical structure.

5. The hot nozzle assembly according to claim 2, characterized in that: The first end opening is located at the top of the valve needle sleeve; The top of the valve needle sleeve protrudes upward to form a tip, and the tip has a flow-guiding inclined surface.

6. The hot nozzle assembly according to claim 1, characterized in that: The valve needle includes a valve needle body and an annular protrusion formed by the valve needle body extending outward. The energy storage component is a spring; One end of the spring abuts against the annular protrusion, and the other end of the spring abuts against the inner wall of the valve needle sleeve.

7. The hot nozzle assembly according to claim 6, characterized in that: The valve needle sleeve forms a first limiting groove that is matched with the annular boss and a second limiting groove that is formed at the end of the valve needle body away from the gate.

8. The hot nozzle assembly according to claim 1, characterized in that: The valve needle sleeve includes an upper cover and a base arranged opposite to each other; The upper cover and the base together define the receiving chamber and the through passage; The base has an extension that extends into the upper cover to engage with the upper cover.

9. The hot nozzle assembly according to claim 1, characterized in that: The hot nozzle includes a hot nozzle body and a sprue sleeve fixed along the axial direction of the hot nozzle body to the bottom of the hot nozzle body; The hot runner includes a first runner formed by the hot nozzle body extending along its axial direction and a second runner formed by the sprue sleeve that is coaxially connected to the first runner. The gate is formed at the bottom of the gate sleeve.

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