An extrusion die with quick change spinning nozzle

Abstract

The utility model discloses an extrusion mould of quick replacement spinning nozzle, including mould body, the mould body of first runner's inside setting, runner bush's inside setting second runner, the spinning nozzle of third runner's inside setting and spinning fixed plate, and the mould body lower extreme is equipped with the installation sunken platform, and the runner bush is embedded therein, and spinning fixed plate can detachable connection in the mould body and compress the runner bush, and spinning nozzle is connected with fixed plate screw thread, and is contacted with bush, realizes runner sealed intercommunication, and the mould body is equipped with heating component with spinning fixed plate. The structure supports quick replacement different specifications' spinning nozzle and runner bush, and can adjust length -diameter ratio and hole type flexibly, satisfies the diversified experimental demand, reduces the cost and workload of changing mould, and promotes the experimental efficiency.

Description

Technical Field

[0001] This utility model relates to the field of extruder die technology, specifically an extrusion die with a quick-change spinning nozzle. Background Technology

[0002] Melt spinning is a widely used spinning technology. The geometry of the spinning nozzle (e.g., orifice diameter, flow channel aspect ratio, shrinkage angle) and process parameters (e.g., die temperature, extrusion speed) significantly influence fiber specifications, quality, and production efficiency. To determine the optimal spinning nozzle for different polymers, experiments require frequent changes of nozzles with different orifice diameters and flow channels. However, current methods using a shoulder-pressure structure that clamps the spinneret onto an annular boss, while self-sealing, necessitate stopping the machine, cooling, and removing the retaining ring, requiring the replacement of the entire nozzle assembly. This process is extremely time-consuming, resulting in low experimental efficiency and hindering the evaluation of the effects of different flow channel structures on the spinning process. Therefore, to meet the laboratory requirements for melt spinning process testing, a new extrusion die with a rapidly and reliably replaceable spinning nozzle is needed for melt spinning experiments of polymer materials. Utility Model Content

[0003] This invention provides an extrusion die with a quick-change spinning nozzle that can significantly improve experimental efficiency.

[0004] The extrusion die with a quick-change spinning nozzle of this utility model includes a die body connected to an extruder and having a first flow channel, a flow channel bushing having a second flow channel, a spinning nozzle having a third flow channel, and a spinning fixing plate. The lower end face of the die body is provided with a mounting platform corresponding to the outlet of the first flow channel. The flow channel bushing is embedded in the mounting platform. The spinning fixing plate is detachably installed on the lower end face of the die body and axially presses and fixes the flow channel bushing. The spinning nozzle and the spinning fixing plate are coaxially and detachably connected through a threaded pair, and the spinning nozzle abuts against the flow channel bushing to seal and connect the first flow channel, the second flow channel, and the third flow channel in sequence. The die body and the spinning fixing plate are also provided with heating components for heating the melt in each flow channel.

[0005] The extrusion die with a rapidly replaceable spinning nozzle features a die body, flow channel bushing, and spinning nozzle sequentially sealed and connected via first, second, and third flow channels, forming a multi-stage variable melt channel. This structure allows for the replacement of flow channel bushings and spinning nozzles of different specifications as needed, enabling rapid switching of aspect ratios and orifice parameters to meet diverse experimental requirements for fiber diameter and structure, significantly reducing die costs and die-changing workload. The spinning nozzle and spinning fixing plate of this invention are threaded together, facilitating easy assembly and disassembly. Process adjustments can be achieved simply by replacing the nozzle, greatly shortening the development cycle. The spinning fixing plate is detachably connected to the lower end of the die body, and the flow channel bushing is embedded in the mounting platform, ensuring precise positioning and reliable sealing, further improving experimental efficiency and operational flexibility.

[0006] As a preferred embodiment of this utility model, the end of the flow channel bushing that abuts against the spinning nozzle is provided with a conical boss, and the spinning nozzle is provided with a conical concave platform that matches the conical boss.

[0007] As a preferred embodiment of this utility model, the mold body is provided with a flange interface for connecting to an extruder.

[0008] As a preferred embodiment of this utility model, the inner side of the flange interface is recessed with a step for placing the solvent filter screen.

[0009] As a preferred embodiment of this utility model, the end of the mold body connected to the extruder is provided with an inlet channel with a diameter larger than that of the first flow channel, and a transition flow channel with a sidewall converging angle of 15-90 degrees is provided between the inlet flow channel and the first flow channel.

[0010] As a preferred embodiment of this utility model, the mold body is composed of upper and lower sections. The upper section is a box body that connects to the extruder, and the lower section is a cylinder body that connects to the spinning fixing plate. The heating assembly includes a heating rod inserted into the box body and heating rings that cover the flange interface, the cylinder, and the outer periphery of the spinning fixing plate. The box body is provided with a first mounting hole for installing the heating rod, and a second mounting hole is provided on the side of the box body on the first mounting hole for screwing in and tightening the heating rod.

[0011] As a preferred embodiment of this utility model, the side wall of the cylinder is provided with a third mounting hole for inserting a thermocouple temperature sensor.

[0012] As a preferred embodiment of this utility model, the lower end face of the cylinder is provided with a plurality of bolt fixing holes for connecting and fixing the spinning fixing plate.

[0013] As a preferred embodiment of this utility model, the sidewall of the spinning nozzle's spinning outlet section is a regular hexagonal prism. Attached Figure Description

[0014] Figure 1 Exploded view of an extrusion die with a quick-change spinning nozzle. Figure 1 .

[0015] Figure 2 Exploded view of an extrusion die with a quick-change spinning nozzle. Figure 2 .

[0016] Figure 3 This is a cross-sectional view of an extrusion die with a quick-change spinning nozzle.

[0017] Figure 4 This is a cross-sectional view of the flow channel bushing structure.

[0018] Figure 5This is a cross-sectional view of the spinning nozzle structure. Detailed Implementation

[0019] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "equipped with," "connected," and "linked" 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.

[0022] If the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "several" means one or more, "multiple" means two or more, and "above," "below," and "within" are all understood to include the stated number. Furthermore, the technical features of each embodiment can be arbitrarily combined. For the sake of brevity, not all possible combinations of the technical features in the embodiments are described; however, as long as these combinations of technical features do not contradict each other, they should be considered within the scope of this specification.

[0023] like Figure 1-5As shown, an extrusion die with a quick-change spinning nozzle includes a die body 1 connected to an extruder and having a first flow channel 101 inside, a flow channel bushing 2 having a second flow channel 201 inside, a spinning nozzle 3 having a third flow channel 301 inside, and a spinning fixing plate 4. The lower end face of the die body 1 is provided with a mounting platform 102 corresponding to the outlet of the first flow channel. The flow channel bushing 2 is embedded in the mounting platform 102. The spinning fixing plate 4 is detachably installed on the lower end face of the die body and axially presses and fixes the flow channel bushing. The spinning nozzle 3 and the spinning fixing plate 4 are coaxially and detachably connected by a threaded pair, and the spinning nozzle abuts against the flow channel bushing to seal and connect the first flow channel, the second flow channel, and the third flow channel in sequence. The die body and the spinning fixing plate are also provided with heating components for heating the melt in each flow channel. The extrusion die with a rapidly replaceable spinning nozzle features a die body, flow channel bushing, and spinning nozzle sequentially sealed and connected via first, second, and third flow channels, forming a multi-stage variable melt channel. This structure allows for the replacement of flow channel bushings and spinning nozzles of different specifications as needed, enabling rapid switching of aspect ratios and orifice parameters to meet diverse experimental requirements for fiber diameter and structure, significantly reducing die costs and die-changing workload. The spinning nozzle and spinning fixing plate of this invention are threaded together, facilitating easy assembly and disassembly. Process adjustments can be achieved simply by replacing the nozzle, greatly shortening the development cycle. The spinning fixing plate is detachably connected to the lower end of the die body, and the flow channel bushing is embedded in the mounting platform, ensuring precise positioning and reliable sealing, further improving experimental efficiency and operational flexibility.

[0024] The flow channel bushing 2 has a conical boss 202 at one end that abuts against the spinning nozzle, and the spinning nozzle 3 has a conical recess 302 that matches the conical boss. When the conical boss and conical recess are axially pressed together, they form a self-centering conical seal, eliminating radial assembly errors and achieving precise coaxial positioning and leak-free end-face docking between the flow channel bushing and the spinning nozzle. Furthermore, the seal remains consistent even after repeated disassembly and reassembly, significantly improving spinning accuracy and experimental repeatability after replacing the spinning nozzle.

[0025] The mold body 1 is provided with a flange interface 103 for connecting to an extruder. The inner side of the flange interface 103 is recessed with a step 104 for placing the melt filter screen, so that the melt filter screen can be embedded and installed, eliminating the need for additional pressure rings or brackets, making the structure more compact and the installation more convenient and faster.

[0026] The end of the die 1 connected to the extruder is provided with an inlet channel 105 with a diameter larger than that of the first channel 101. Between the inlet channel and the first channel, there is a transition channel 106 with a sidewall converging angle of 15-90 degrees. The inlet channel diameter is larger than that of the first channel, which can form a buffer cavity when the melt enters the die, reducing inlet pressure fluctuations; the 15-90 degree converging transition channel enables the melt to achieve laminar contraction in a short distance, eliminating eddies and stagnant zones, and providing a stable and uniform melt flow.

[0027] Specifically, the flow channel of this invention is composed of a first flow channel of the die body, a second flow channel of the flow channel bushing, and a third flow channel of the spinning nozzle connected in series. Molten material is extruded from the extruder head, enters the die body through a melt filter installed at the flange interface of the die body, and sequentially passes through the inlet flow channel and a transition flow channel with a sidewall convergence angle of 15-90 degrees before converging into the first flow channel. The flow channel bushing is embedded in the mounting countersunk surface of the lower end face of the die body and is fixed by the shoulder of the spinning fixing plate to ensure that the second flow channel and the first flow channel are coaxially connected. The second flow channel inside the flow channel bushing has a second-stage flow channel convergence section. The flow channel bushing and the spinning nozzle are connected and sealed through the cooperation of a conical concave platform and a conical convex platform, and the molten material then enters the spinning nozzle. The third flow channel inside the spinning nozzle has a third-stage flow channel convergence section, serving as the final die section for melt spinning and forming. The molten material is extruded in a filament shape after passing through the die, leaves the die, and is wound up by an auxiliary machine.

[0028] The mold body 1 consists of two sections, upper and lower. The upper section is a box 107 that connects to the extruder, and the lower section is a cylinder 108 that connects to the spinning fixing plate. The heating assembly includes heating rods inserted into the box body and heating rings covering the flange interface, the cylinder, and the outer periphery of the spinning fixing plate. The box body 107 is provided with a first mounting hole 109 for installing the heating rods. On the side of the first mounting hole, the box body is also provided with a second mounting hole 110 for screwing in and tightening the limiting heating rods, so as to provide continuous and uniform heat supply to the mold body, ensure constant temperature throughout the process, and avoid local overcooling or overheating.

[0029] The cylinder 108 has a third mounting hole 111 radially provided on its side wall for inserting a thermocouple temperature sensor. Real-time temperature measurement and closed-loop feedback via the thermocouple temperature sensor enable precise control of the heating assembly.

[0030] Specifically, the thermocouple, heating ring, and thermocouple temperature sensor are all individually supplied with power and controlled by the extruder PCL temperature control system to achieve temperature feedback and control.

[0031] The lower end face of the cylinder is provided with several bolt fixing holes 112 for connecting and fixing the spinning fixing plate. The spinning fixing plate is connected to the cylinder by several bolts and is fixed with the flow channel bushing by shoulder pressure, which is conducive to the quick replacement of the flow channel bushing.

[0032] The spinning nozzle 3 has a hexagonal prism-shaped sidewall at its spinning outlet. It can be quickly aligned and disassembled using a standard hex wrench, improving the speed of changing the spinning nozzle assembly.

[0033] The above description is merely a preferred embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model. In the description of this utility model, the terms "one embodiment," "some embodiments," "embodiment," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Those skilled in the art will understand, explicitly and implicitly, that, without conflict, the embodiments described herein can be combined with other embodiments, and the embodiments of this utility model and the features within those embodiments can be combined with each other.

Claims

1. An extrusion die with a quick-change spinning nozzle, characterized in that, The device includes a die body (1) connected to an extruder and having a first flow channel (101) inside, a flow channel bushing (2) having a second flow channel (201) inside, a spinning nozzle (3) having a third flow channel (301) inside, and a spinning fixing plate (4). The lower end face of the die body (1) is provided with a mounting platform (102) corresponding to the outlet of the first flow channel. The flow channel bushing (2) is embedded in the mounting platform (102). The spinning fixing plate (4) is detachably installed on the lower end face of the die body and axially presses and fixes the flow channel bushing. The spinning nozzle (3) and the spinning fixing plate (4) are coaxially and detachably connected through a threaded pair. The spinning nozzle abuts against the flow channel bushing to seal and connect the first flow channel, the second flow channel, and the third flow channel in sequence. The die body and the spinning fixing plate are also provided with heating components for heating the melt in each flow channel.

2. The extrusion die with a quick-change spinning nozzle according to claim 1, characterized in that, The flow channel bushing (2) has a conical boss (202) at one end that abuts against the spinning nozzle, and the spinning nozzle (3) has a conical recess (302) that matches the conical boss.

3. The extrusion die with a quick-change spinning nozzle according to claim 1, characterized in that, The mold (1) is provided with a flange interface (103) for connecting to an extruder.

4. The extrusion die with a quick-change spinning nozzle according to claim 3, characterized in that, The flange interface (103) has a recessed step (104) for placing a melt filter screen.

5. The extrusion die with a quick-change spinning nozzle according to claim 1, characterized in that, The mold (1) is connected to the extruder at one end and has an inlet channel (105) with a diameter larger than the first channel (101). A transition channel (106) with a sidewall angle of 15-90 degrees is provided between the inlet channel and the first channel.

6. The extrusion die with a quick-change spinning nozzle according to claim 3, characterized in that, The mold body (1) consists of two sections, an upper section (107) which is connected to the extruder, and a lower section (108) which is connected to the spinning fixing plate. The heating assembly includes a heating rod inserted into the box body and heating rings covering the flange interface, the cylinder and the outer periphery of the spinning fixing plate. The box body (107) is provided with a first mounting hole (109) for installing the heating rod, and a second mounting hole (110) is provided on the box body on one side of the first mounting hole for screwing in and tightening the limiting heating rod.

7. The extrusion die with a quick-change spinning nozzle according to claim 6, characterized in that, The cylinder (108) has a third mounting hole (111) radially provided on its side wall for inserting a thermocouple temperature sensor.

8. The extrusion die with a quick-change spinning nozzle according to claim 6, characterized in that, The lower end face of the cylinder is provided with several bolt fixing holes (112) for connecting and fixing the spinning fixing plate.

9. The extrusion die with a quick-change spinning nozzle according to claim 1, characterized in that, The sidewall of the spinning nozzle (3) at the spinning outlet section is a regular hexagonal prism.

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