Hot nozzle assembly and hot runner system

Abstract

The present invention provides a hot nozzle assembly, comprising a hot nozzle, a nozzle tip unit connected to a first end of the hot nozzle, and a drive unit. The nozzle tip unit comprises a nozzle tip and a shearing piece. The nozzle tip is provided on the first end of the hot nozzle and has a liquid outlet. The shearing piece comprises a plurality of connecting blocks. The drive unit is connected to the plurality of connecting blocks to drive the plurality of connecting blocks to separate or abut and close to form a barrier surface. The barrier surface is located on a flow channel extending from the inside of the liquid outlet to the outside of the nozzle tip. The present invention solves the problems of burrs on the liquid outlet and excessively high dispensing points during the glue sealing process of needle-valve hot runner nozzles in the prior art.

Description

Technical Field

[0001] The present invention relates to the fields of hot runner molds and injection molding, and in particular to a hot nozzle assembly and a hot runner system. Background Art

[0002] In current injection molding, valve pins seal the mold by fitting their head to the mold's outlet. This process often results in issues like loose sealing, burrs at the outlet, excessive resistance to the pin when the plastic near the outlet is too cold, and excessively high dispensing points.

[0003] It can be seen that in the prior art, the needle valve hot runner nozzle has problems such as burrs on the liquid outlet and excessively high glue points during the glue sealing process. Summary of the Invention

[0004] The object of the present invention is to provide a hot nozzle assembly to solve the problems in the prior art of needle valve hot runner hot nozzles such as burrs on the liquid outlet and excessively high glue points during the glue sealing process.

[0005] In order to achieve the above-mentioned purpose of the present invention, one embodiment of the present invention provides a hot nozzle assembly, which includes a hot nozzle, a nozzle tip unit connected to the first end of the hot nozzle, and a driving unit, the nozzle tip unit includes a nozzle tip and a shearing piece, the nozzle tip is arranged on the first end of the hot nozzle and has a liquid outlet, the shearing piece includes a plurality of connecting blocks, the driving unit is connected to the plurality of connecting blocks to drive the plurality of connecting blocks to separate or abut against each other and close to form a barrier surface, and the barrier surface is located on the flow channel extending from the liquid outlet to the outside of the nozzle tip.

[0006] As a further improvement of an embodiment of the present invention, when the multiple connecting blocks are abutted and closed, the abutting portions of the multiple connecting blocks are provided with cutting edges.

[0007] As a further improvement of one embodiment of the present invention, the driving unit includes a transmission member, which includes an active member passing through the liquid outlet, a plurality of first connecting rods and a plurality of second connecting rods, the first end of the first connecting rod is connected to the connecting block, the second end of the first connecting rod is pivotally connected to the active member, the first end of the second connecting rod is pivotally connected between the first end and the second end of the first connecting rod, and the second end of the second connecting rod is pivotally connected to the inner side of the liquid outlet, and the active member can be driven to move relative to the nozzle tip along the axial direction of the nozzle tip to drive the plurality of connecting blocks to separate or abut and close.

[0008] As a further improvement of one embodiment of the present invention, the active part is configured as a valve needle, the valve needle having a needle rod portion and a needle tip portion, the nozzle tip is connected to the hot nozzle to define an injection channel located inside the nozzle tip and the hot nozzle, the needle rod portion is at least partially located in the injection channel, the needle tip portion is connected to one end of the needle rod portion and protrudes out of the nozzle tip, and the second end of the first connecting rod is connected to the portion of the needle tip portion located outside the nozzle tip.

[0009] As a further improvement of one embodiment of the present invention, the hot nozzle assembly includes a diverter plate connected to the second end of the hot nozzle, the driving unit also includes a driving member, the driving member is connected to the side of the diverter plate facing away from the hot nozzle, the part of the needle rod protruding from the hot nozzle passes through the diverter plate and is connected to the driving member, and the driving member can drive the valve needle to move axially along the nozzle tip.

[0010] As a further improvement of an embodiment of the present invention, a plurality of connecting seats are provided on the portion of the needle tip portion located outside the tip of the nozzle, and the second end of the first connecting rod is pivotally connected to the connecting seat.

[0011] As a further improvement of an embodiment of the present invention, the plurality of connecting seats are evenly distributed along the circumference of the needle tip.

[0012] As a further improvement of an embodiment of the present invention, a plurality of mounting seats are provided on the inner side of the liquid outlet, and the second end of the second connecting rod is pivotally connected to the mounting seats.

[0013] As a further improvement of an embodiment of the present invention, the plurality of mounting seats are evenly distributed along the circumference of the liquid outlet.

[0014] One embodiment of the present invention also provides a hot runner system, which includes the hot nozzle assembly and mold as described above, the first end of the hot nozzle is connected to the injection part of the mold to form an injection cavity, the cavity wall of the injection cavity is provided with a gate corresponding to the liquid outlet, a plurality of connecting blocks are located in the injection cavity, and the barrier surface cuts off the flow channel leading to the gate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The driving unit can drive multiple connecting blocks to separate or abut against each other to form a barrier surface. The barrier surface is located on the flow channel extending from the inside of the liquid outlet to the outside of the nozzle tip. Through the cooperation of the hot nozzle assembly and the injection part of the mold, the flow channel leading to the gate on the injection part can be closed through the barrier surface, thereby solving the problems of burrs on the liquid outlet and excessively high glue points in the glue sealing process of the needle valve hot runner hot nozzle in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a hot nozzle assembly in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 Explosion diagram of

[0019] Figure 3 for Figure 1 Right view;

[0020] Figure 4 for Figure 3 Cross-section view in the AA direction;

[0021] Figure 5 for Figure 4 Enlarged view of the M in the middle;

[0022] Figure 6 for Figure 1 Schematic diagram of the structure of the middle transmission member and the shear member;

[0023] Figure 7 for Figure 6 Enlarged view of point N in the middle;

[0024] Figure 8 for Figure 1 A schematic structural diagram of the nozzle tip being mounted on the first end of the hot nozzle;

[0025] Figure 9 for Figure 8 Enlarged view of the X in the middle;

[0026] Figure 10 This is a schematic structural diagram of a heat flow system in one embodiment of the present invention;

[0027] Figure 11 for Figure 10 Right view;

[0028] Figure 12 for Figure 11 Cross-section in the middle BB direction;

[0029] Figure 13 for Figure 12 Enlarged view of Y in the middle.

[0030] The above description of the drawings includes the following reference numerals:

[0031] 1. Hot nozzle; 11. Hot nozzle body; 12. Pressure cap;

[0032] 2. Nozzle tip unit; 21. Nozzle tip; 211. Liquid outlet; 2111. Mounting seat; 23. Shear member; 231. Connecting block;

[0033] 31. Transmission member; 311. First connecting rod; 312. Second connecting rod; 313. Valve needle; 3131. Needle rod; 3132. Needle tip; 31321. Connecting seat; 32. Driving member;

[0034] 4. Liquid injection channel; 5. Liquid injection part; 51. Liquid injection cavity; 511. Gate; 6. Diverter plate. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0037] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0038] When sealing glue in existing needle-valve hot runner nozzles, the valve needle is inserted into the liquid outlet at the nozzle tip to block the glue. After the valve needle is blocked in the liquid outlet, some injection liquid will remain in the space outside the valve needle in the liquid outlet. This injection liquid will still flow to the glue dispensing point after sealing, causing burrs to appear at the glue dispensing point. In addition, during the process of the valve needle extending into the liquid outlet, the injection liquid near the liquid outlet is easily cooled, thereby generating resistance to the valve needle, delaying the time it takes for the valve needle to block the liquid outlet. During this delayed period, injection liquid still flows out of the liquid outlet, causing the glue dispensing point to be located higher. To address these problems, the present invention provides a hot nozzle assembly.

[0039] like Figure 1-9 As shown, a hot nozzle assembly of this embodiment includes a hot nozzle 1, a nozzle tip unit 2 connected to the first end of the hot nozzle 1, and a driving unit 3, the nozzle tip unit 2 includes a nozzle tip 21 and a shearing piece 23, the nozzle tip 21 is provided on the first end of the hot nozzle 1 and has a liquid outlet 211, the shearing piece 23 includes a plurality of connecting blocks 231, the driving unit 3 is connected to the plurality of connecting blocks 231 to drive the plurality of connecting blocks 231 to separate or abut and close to form a barrier surface, and the barrier surface is located on the flow channel extending from the liquid outlet 211 to the outside of the nozzle tip 23.

[0040] In the above-mentioned setting, the driving unit 3 can drive multiple connecting blocks 231 to separate or abut against each other to form a barrier surface. The barrier surface is located on the flow channel extending from the liquid outlet 211 to the outside of the nozzle tip 23. Through the hot nozzle assembly and the injection part 5 of the mold, the flow channel leading to the gate 5 on the injection part 5 can be closed through the barrier surface, thereby solving the problem of burrs or increased point positions at the dispensing points on the product.

[0041] In this embodiment, preferably, when the driving unit 3 drives the multiple connecting blocks 231 to abut and close, the abutting portions of the multiple connecting blocks 231 are provided with cutting edges. This ensures that when the connecting blocks 231 are driven to abut and close, they can better shear the injection liquid, so that the sealing effect is not affected by the state of the injection liquid.

[0042] Furthermore, in order to drive the multiple connecting blocks 231 to separate or abut against each other, the driving unit can be configured as a telescopic cylinder configured for each connecting block 232, and the multiple connecting blocks 231 can be separated or abutted against each other by the extension and contraction of each telescopic cylinder.

[0043] Of course, the driving unit may also be configured as other power devices to achieve separation or contact between the multiple connecting blocks 231. The present invention does not limit this.

[0044] Specifically, in this embodiment, the driving unit 3 includes a transmission member 31, and the transmission member 31 includes an active member passing through the liquid outlet 211, a plurality of first connecting rods 311 and a plurality of second connecting rods 312, the first end of the first connecting rod 311 is connected to the connecting block 231, the second end of the first connecting rod 311 is pivotally connected to the active member, the first end of the second connecting rod 312 is pivotally connected between the first end and the second end of the first connecting rod, and the second end of the second connecting rod 312 is pivotally connected to the inner side of the liquid outlet 211, and the active member can be driven to move relative to the nozzle tip 21 along the axial direction of the nozzle tip 21 to separate the plurality of connecting blocks 231 or abut against each other to form a blocking surface.

[0045] In this embodiment, when the active member is driven to move relative to the nozzle tip 21 along the axial direction of the nozzle tip 21, the active member drives the first connecting rod 311 to move, and the first connecting rod 311 pivots relative to the second connecting rod 312 during the movement, and the second end of the second connecting rod 312 that is not connected to the first connecting rod 311 is pivotally connected to the inner side of the liquid outlet 211, thereby realizing the opening and closing of multiple connecting blocks 231.

[0046] Furthermore, the active part is configured as a valve needle 313, and the valve needle 313 has a needle rod portion 3131 and a needle tip portion 3132. The nozzle tip 21 is connected to the hot nozzle 1 to define an injection channel 4 located inside the nozzle tip and the hot nozzle. The needle rod portion 3131 is at least partially located in the injection channel 4, and the needle tip portion 3132 is connected to one end of the needle rod portion and protrudes out of the nozzle tip. The second end of the first connecting rod 311 is connected to the portion of the needle tip portion 3132 located outside the nozzle tip 21.

[0047] It can be understood that the active component is set as the valve needle 313, which facilitates the transformation of the hot nozzle assembly in the prior art into the hot nozzle assembly required by the present invention.

[0048] It should be noted that the liquid injection channel 4 includes a first section located inside the hot nozzle and a second section located in the nozzle tip 21. The first section and the second section are connected to form the liquid injection channel 4. The liquid outlet 211 is located in the nozzle tip and is connected to the end of the second section away from the first section.

[0049] Furthermore, the hot nozzle assembly includes a diverter plate 6 connected to the second end of the hot nozzle 1, and the driving unit also includes a driving member 32, which is connected to the side of the diverter plate 6 facing away from the hot nozzle 1. The part of the needle rod portion 3131 protruding from the hot nozzle 1 passes through the diverter plate 6 and is connected to the driving member 32 to drive the valve needle 313 to move axially along the nozzle tip 31.

[0050] Exemplarily, a plurality of connection seats 31321 are provided on the portion of the needle tip portion 3132 located outside the mouth tip 21 , and the second end of the first connection rod 311 is pivotally connected to the connection seat 31321 .

[0051] As a preferred embodiment, the plurality of connecting seats 31321 are evenly distributed along the circumference of the needle tip 3132 , so that the second end of the first connecting rod 311 is evenly connected to the circumference of the valve needle 313 .

[0052] Correspondingly, a plurality of mounting seats 2111 are provided on the inner side of the liquid outlet 211 , and the second end of the second connecting rod 312 is pivotally connected to the mounting seat 2111 .

[0053] Preferably, the plurality of mounting seats 2111 are evenly distributed along the circumference of the liquid outlet 211 , so that the second end of the second connecting rod 312 is evenly connected to the inner side of the liquid outlet 211 along the circumference of the liquid outlet 211 .

[0054] In some embodiments, the hot nozzle 1 includes a hot nozzle body 11 and a pressure cap 12 fixedly connected to the inner side of the hot nozzle body by threads, and in the extension direction of the axis of the hot nozzle body 11, the pressure cap 12 abuts against the nozzle tip 21 to fix the nozzle tip 21 to the inner side of the hot nozzle body 11.

[0055] like Figure 10-13 An embodiment of the present invention further provides a hot runner system, comprising the hot nozzle assembly and a mold as described above (not shown in the figure), wherein the first end of the hot nozzle 1 is connected to the liquid injection part 5 of the mold to form a liquid injection cavity 51, and a gate 511 corresponding to the liquid outlet 211 is provided on the cavity wall of the liquid injection cavity 51, a plurality of connecting blocks 231 are located in the liquid injection cavity 51, and the barrier surface cuts off the flow channel leading to the gate 511.

[0056] The above-mentioned setting method connects and cooperates the hot nozzle 1 with the injection part 5 of the mold to form an injection cavity 51, and the nozzle tip 21 is provided with a liquid outlet 211, and the cavity wall of the injection cavity 51 is provided with a gate 511 corresponding to the liquid outlet 211. Multiple connecting blocks 231 are located in the injection cavity, and the driving unit 3 drives the multiple connecting blocks 231 to abut and close to form a blocking surface. The blocking surface can cut off the flow channel leading to the gate 511, thereby putting the hot nozzle assembly in a closed state.

[0057] Understandably, since the multiple connecting blocks 231 are located within the injection chamber 51, the injection liquid is less susceptible to cooling within this chamber, and therefore, the resistance exerted on the connecting blocks 231 is relatively low. Therefore, when the multiple connecting blocks 231 are driven into abutment and closed, they can promptly shear the flow path leading to the gate 511, thereby preventing the injection liquid from flowing out even after the flow path is closed. Furthermore, since the multiple connecting blocks 231 are driven into abutment and closed, a certain shear force is generated, which can cut through plastic in any state, ensuring that the closure of the gate 511 is not affected by the state of the injection liquid.

[0058] The above arrangement can solve the problems in the prior art of the needle valve hot runner nozzle having burrs on the liquid outlet and the glue point being too high during the glue sealing process.

[0059] It should be noted that, in this embodiment, the liquid injection portion 5 of the mold generally has the following Figure 10-13The gate 511 is arranged on the hemispherical wall relative to the liquid outlet 211. The multiple connecting blocks 231 can be configured as curved surfaces. Therefore, the driving unit 3 drives the connecting blocks 231 to abut and close together to form a hemispherical barrier surface. The hemispherical barrier surface can cooperate with the hemispherical wall and abut against the inner side of the gate 511. With this configuration, the multiple connecting blocks 231 can shear the injection liquid during the abutment and closing process, and can better prevent the liquid from flowing out of the gate 511.

[0060] Of course, the plurality of connecting blocks 231 may also be driven to abut against each other and closed to form a barrier surface of other shapes to block the flow passage leading to the gate 511 , thereby achieving the function of intercepting the flow, which is not limited in the present invention.

[0061] In summary, the embodiments of the present invention achieve the following technical effects:

[0062] The driving unit 3 can drive multiple connecting blocks 231 to separate or abut against each other to form a barrier surface. The barrier surface is located on the flow channel extending from the inside of the liquid outlet 211 to the outside of the nozzle tip 23. Through the hot nozzle assembly and the injection part 5 of the mold, the flow channel leading to the gate 5 on the injection part 5 can be closed through the barrier surface, thereby solving the problems of burrs on the liquid outlet and excessively high glue points in the glue sealing process of the needle valve hot runner hot nozzle in the prior art.

[0063] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A hot nozzle assembly, characterized in that: The invention comprises a hot nozzle (1), a nozzle tip unit (2) connected to the first end of the hot nozzle (1), and a driving unit (3), wherein the nozzle tip unit (2) comprises a nozzle tip (21) and a shearing piece (23), wherein the nozzle tip (21) is arranged on the first end of the hot nozzle (1) and has a liquid outlet (211), and the shearing piece (23) comprises a plurality of connecting blocks (231), and the driving unit (3) is connected to the plurality of connecting blocks (231) to drive the plurality of connecting blocks (231) to separate or abut and close to form a barrier surface, wherein the barrier surface is located on a flow channel extending from the liquid outlet (211) to the outside of the nozzle tip (21); When the plurality of connecting blocks (231) are abutted and closed, a cutting edge is provided at the abutting portions of the plurality of connecting blocks (231); The driving unit (3) includes a transmission member (31), the transmission member (31) includes an active member penetrating the liquid outlet (211), a plurality of first connecting rods (311), and a plurality of second connecting rods (312), the first end of the first connecting rod (311) is connected to the connecting block (231), the second end of the first connecting rod (311) is pivotally connected to the active member, the first end of the second connecting rod (312) is pivotally connected between the first end and the second end of the first connecting rod, and the second end of the second connecting rod (312) is pivotally connected to the inner side of the liquid outlet (211), the active member can be driven to move relative to the nozzle tip (21) along the axial direction of the nozzle tip (21) to drive the plurality of connecting blocks (231) to separate or abut and close; The active component is configured as a valve needle (313), and the valve needle (313) has a needle rod portion (3131) and a needle tip portion (3132). The nozzle tip (21) is connected to the hot nozzle (1) to define an injection flow channel (4) located inside the nozzle tip (21) and the hot nozzle. The needle rod portion (3131) is at least partially located in the injection flow channel. The needle tip portion (3132) is connected to one end of the needle rod portion and protrudes from the nozzle tip (21). The second end of the first connecting rod is connected to a portion of the needle tip portion (3132) located outside the nozzle tip (21).

2. The hot nozzle assembly according to claim 1, characterized in that The hot nozzle assembly includes a diverter plate (6) connected to the second end of the hot nozzle (1), and the drive unit (3) also includes a drive member (32). The drive member is connected to the side of the diverter plate (6) facing away from the hot nozzle (1). The part of the needle rod (3131) protruding from the hot nozzle (1) passes through the diverter plate (6) and is connected to the drive member (32). The drive member (32) can drive the valve needle (313) to move axially along the nozzle tip (21).

3. The hot nozzle assembly according to claim 1, characterized in that The needle tip portion (3132) is provided with a plurality of connecting seats (31321) at a portion located outside the mouth tip (21), and the second end of the first connecting rod (311) is pivotally connected to the connecting seat (31321).

4. The hot nozzle assembly according to claim 3, characterized in that The plurality of connecting seats (31321) are evenly distributed along the circumference of the needle tip.

5. The hot nozzle assembly according to claim 1, characterized in that A plurality of mounting seats (2111) are provided on the inner side of the liquid outlet (211), and the second end of the second connecting rod (312) is pivotally connected to the mounting seat (2111).

6. The hot nozzle assembly according to claim 5, characterized in that: The plurality of mounting seats (2111) are evenly distributed along the circumference of the liquid outlet.

7. A hot runner system, characterized in that: The invention comprises a hot nozzle assembly and a mold according to any one of claims 1 to 6, wherein the first end of the hot nozzle (1) is connected to the liquid injection part (5) of the mold to form a liquid injection cavity (51), a gate (511) corresponding to the liquid outlet (211) is provided on the cavity wall of the liquid injection cavity (51), a plurality of connecting blocks (231) are located in the liquid injection cavity (51), and the blocking surface cuts off the flow channel leading to the gate (511).

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