A multi-thread spinning head system

Abstract

The utility model belongs to the field of spinning, disclose a kind of multi-line spinning head system, comprising: main glue supply pipeline, be configured as conveying spinning dope;Filtering device, configured as filtering spinning dope;N head boxes, the two sides of each head box are respectively provided with glue port;N-n head boxes are respectively provided with filtering device at the glue port of one side, and communicate with main glue supply pipeline;The glue port of other side respectively communicates with balance pipeline;The glue port of the two sides of balance pipeline and remaining n head boxes communicates, and spinning dope in balance pipeline enters remaining n head boxes.The utility model, at least one side glue port of multiple head boxes is communicated by balance pipeline, and the pressure of the glue port of each head box is substantially consistent, and the temperature difference of each glue port is also reduced, and the uniformity of spinning filament is improved.

Description

Technical Field

[0001] This utility model belongs to the field of spinning, specifically, it relates to a multi-wire spinning head system. Background Technology

[0002] The demand for polyacrylonitrile (PA) as the main raw material for producing carbon fiber is increasing. The spinning methods for PA fiber mainly include wet spinning, dry-wet spinning, gel spinning, and electrospinning. Among them, wet spinning and dry-jet wet spinning are important spinning methods for PA fiber.

[0003] In both wet spinning and dry-jet wet spinning processes, fibers undergo a coagulation bath forming process. In wet spinning, after the spinning solution is extruded from the spinneret into the coagulation bath, the surface layer of the spinning stream first contacts the coagulation medium and quickly solidifies into a thin layer. The coagulant in the coagulation bath continuously diffuses through this surface layer into the interior of the stream, while the solvent in the stream also continuously diffuses through the surface layer into the coagulation bath. This process is the double diffusion process in wet spinning. Due to the continuous double diffusion, the skin layer of the spinning stream continuously thickens. When the solvent concentration in the middle part of the stream decreases below a certain critical value, phase separation occurs in the spinning stream, meaning the nascent fibers precipitate out of the bath solution, accompanied by a certain degree of volume shrinkage.

[0004] The spinning solution enters the coagulation bath through the spinning head assembly, which includes a pre-spinning glue supply line, a precision filter, a head box, a pressure sensor, a metering pump, a gooseneck tube, and a spinneret. The specific process is as follows: the glue supply pump delivers the spinning solution through the pre-spinning regulating valve and the pre-spinning glue supply line to the precision filter in the head box. After filtration by the precision filter, the solution is distributed to both sides of the head box via the precision filter side. After entering the head box, it is pumped by the metering pump to the gooseneck tube and spinneret, and finally into the coagulation bath.

[0005] For example, CN222878173U discloses a coagulation bath head box, comprising: a box body, the box body having a glue cavity, the glue cavity being connected to a plurality of glue distribution channels; a first glue inlet and a second glue inlet, disposed on opposite sides of the glue cavity and connected to the glue cavity; the spinning solution entering the glue cavity through the first glue inlet and the second glue inlet, and then being output through the glue distribution channels.

[0006] However, the current method of distributing the glue from the rear of the precision filter in the headstock to both sides still has the following drawbacks:

[0007] (1) In actual production, multiple sets of spinneret boxes are set up in parallel, and the spinning solution enters the spinneret box and spinneret plate of each spinneret box assembly for spinning. However, each spinneret box needs to be equipped with a precision filter. After being filtered by the precision filter, the solution is distributed to the glue inlet on both sides. Due to various factors such as different installation methods of the filters, different impurities in the glue passing through the filters, different lengths of the glue supply lines to each filter, inconsistent number of bends, and different number of days the filters are online, the inlet pressure of different spinneret boxes deviates. The maximum difference can reach 200 kPa, which indirectly leads to differences in the inlet pressure of the metering pump, and ultimately results in uneven yarn bundles.

[0008] (2) Each head box has glue inlet on both sides, but one side glue inlet is close to the filter, while the other side glue inlet needs to be transported through a longer pipeline and is farther from the filter. This will cause a difference in the amount of glue inlet on both sides, which in turn will cause a large difference in the glue inlet temperature on both sides. The maximum temperature difference will reach 15℃, which is not conducive to the uniformity of the fibers.

[0009] (3) When the pressure difference of the precision filter is too high, the filter needs to be replaced. Before replacing the filter, the eight spindles of the whole machine head need to be lifted before the filter can be replaced, which affects the output and increases the workload of cleaning the spinneret.

[0010] In view of this, this utility model is proposed. Utility Model Content

[0011] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a multi-wire spinning head system. One side of the glue outlet of Nn head boxes is connected through a balance pipe, and the balance pipe is connected to the two sides of the glue outlet of the remaining n head boxes. In this way, the pressure of the glue outlet of the N head boxes is basically the same, which greatly reduces the temperature difference of the glue outlet and improves the uniformity of spinning.

[0012] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0013] This utility model provides a multi-wire spinning head system, including:

[0014] The main adhesive supply pipeline is configured to transport spinning solution.

[0015] The filtration device is configured to filter the spinning solution;

[0016] N head boxes, each with a glue port on both sides;

[0017] A filter device is installed at the glue inlet on one side of each of the Nn head boxes and is connected to the main glue supply pipeline; the glue inlet on the other side is connected to the balance pipeline; the balance pipeline is connected to the glue inlets on both sides of the remaining n head boxes, and the spinning solution in the balance pipeline enters the remaining n head boxes.

[0018] A further scheme is proposed where Nn > n.

[0019] In a further embodiment, the glue inlets on both sides of the remaining n machine head boxes are connected to the balance pipe through the first liquid inlet branch and the second liquid inlet branch, respectively; the first liquid inlet branch and the second liquid inlet branch are of the same length.

[0020] A further proposed solution involves arranging N head boxes side-by-side. The glue outlets on one side of the first N-1 head boxes are connected to the main glue supply pipeline, while the glue outlets on the other side are connected to the balancing pipeline. The glue outlets on both sides of the last head box are connected to the balancing pipeline.

[0021] In a further embodiment, the balancing pipe is equipped with an exhaust device.

[0022] In a further embodiment, the exhaust devices are respectively installed at both ends of the balance pipe, and the balance pipe between the two ends is connected to the rubber inlets on one or both sides of each head box through multiple branch pipes.

[0023] In a further embodiment, a pressure detection device is installed on the balancing pipe.

[0024] In a further embodiment, a temperature detection device is installed on the balancing pipe.

[0025] A further proposed solution involves placing a greater number of filters at the glue outlet of the upstream headbox than in other headboxes, based on the flow direction of the spinning solution in the balancing pipeline.

[0026] A further solution is to install a temperature detection device at the outlet of each filtration unit.

[0027] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art.

[0028] 1. The multi-thread spinning head system of this utility model connects one side of the glue outlet of Nn head boxes through a balance pipe, and the balance pipe is connected to the two sides of the glue outlet of the remaining n head boxes. In this way, the pressure of the glue outlet of the N head boxes is basically the same, and the maximum pressure difference of the glue outlet is reduced from 200Kpa to 30Kpa, resulting in more uniform yarn output and improved spinning uniformity.

[0029] 2. In the multi-line spinning head system of this utility model, since each head box has at least one glue port connected through a balance pipe, the supply of spinning solution is interconnected. When one head box needs to replace the filter device, the other head boxes can supply spinning solution to it through the balance pipe. In this way, the filter device can be replaced without lifting the spindle (i.e., stopping the machine), which can ensure spinning output and reduce the workload of spinneret cleaning.

[0030] 3. In the multi-thread spinning head system of this utility model, the temperature difference between the glue inlets on both sides of each head box is significantly reduced. In the original method of glue inlet on both sides, the maximum temperature difference would reach 15℃, while in this utility model, the maximum temperature difference between the glue inlets on both sides is reduced to 3℃.

[0031] 4. In the multi-thread spinning head system of this utility model, the pressure is basically the same, making it inconvenient to judge whether the filter needs to be replaced based on pressure changes. In order to facilitate the timely replacement of filter devices with problems such as blockage, a temperature detection device is added to the outlet of each filter device. When the detected temperature is lower than a certain value, it indicates that the flow rate is too low and the filter device needs to be replaced, ensuring safe and stable production operation.

[0032] 5. In the multi-line spinning head system of this utility model, according to the flow direction of the spinning solution in the balance pipe, the number of filter devices at the glue inlet of the upstream head box is greater than the number of filter devices in other head boxes. This can increase the glue inlet of the upstream head box, ensure the glue supply flow of the downstream head boxes that need to be supplied with glue through the balance pipe, increase the flow rate of materials in the balance pipe, ensure stable glue temperature, and ensure stable production of the entire system.

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the multi-line spinning machine head system before the improvement;

[0036] Among them, 100 is the main glue supply pipe, 200 is the filter, 300 is the machine head box, 301 is the first glue inlet, 302 is the second glue inlet, 303 is the glue inlet branch pipe, and 400 is the pressure sensor;

[0037] Figure 2 This is a schematic diagram of the structure of the multi-thread spinning head system of this utility model;

[0038] The system includes: 1. Main glue supply pipeline; 2. Filtering device: 21. First filter; 22. Second filter; 23. Third filter; 24. Fourth filter; 25. Fifth filter; 3. Head unit box: 31. First head unit box; 32. Second head unit box; 33. Third head unit box; 34. Fourth head unit box; 35. Fifth head unit box; 36. Glue inlet; 37. First liquid inlet branch; 38. Second liquid inlet branch; 4. Balancing pipeline: 41. First branch pipeline; 42. Second branch pipeline; 43. Third branch pipeline; 44. Fourth branch pipeline; 45. Fifth branch pipeline; 5. Exhaust device; 6. Pressure detection device; 7. Temperature detection device; 8. Control valve.

[0039] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0042] 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The spinning headbox is the very beginning of the spinning line, downstream of which is the coagulation bath. The main glue supply pipe for conveying the spinning solution is connected to the spinning headbox, which is connected to the spinnerets via gooseneck tubes. Each spinneret is located in a glue channel within the coagulation bath. The coagulation bath is filled with coagulation liquid. After entering the spinning headbox, the spinning solution is redistributed and output to each spinneret via the gooseneck tubes. The spinning solution is extruded through the spinneret orifices into the coagulation bath, where it undergoes double diffusion to form nascent fibers, which then undergo subsequent drawing and other steps to form the final fiber.

[0044] It should be noted that the spinning solution mentioned above is also called the spinning solution, commonly known as the glue. In the following description of the embodiments, "glue" or "glue solution" refers to the spinning solution.

[0045] Figure 1 This is an example of an improved multi-line spinning head system. The existing multi-line spinning head system includes multiple head boxes 300 arranged side-by-side. A main glue supply pipe 100 is connected to each head box 300, simultaneously supplying spinning solution to multiple head boxes. Each head box 300 includes a housing with a glue chamber connected to multiple distribution channels (typically eight). A first glue inlet 301 and a second glue inlet 302 are located on opposite sides of the glue chamber and are connected to it. The spinning solution enters the glue chamber through the first glue inlet 301 and the second glue inlet 302, and then exits through the distribution channels. A filter 200 is installed on the pipe near the first glue inlet 301 of each head box. After filtration by the filter 200, a portion of the spinning solution enters the glue chamber through the first glue inlet 301, and a portion enters the second glue inlet 302 through a glue inlet branch pipe 303. A pressure sensor 400 is installed at the outlet end of the filter 200.

[0046] Therefore, the existing multi-headbox assembly is set up in parallel, with the spinning solution entering the headbox and spinneret of each assembly for spinning. However, due to differences in filter installation, the amount of impurities filtered, and the length of the glue supply pipeline, the inlet pressure of different headboxes deviates, with a maximum difference of up to 200 kPa. This indirectly leads to differences in the inlet pressure of the metering pump, ultimately resulting in uneven fiber bundles. The glue inlet method on both sides of each headbox results in inconsistent glue flow rates and significant temperature differences, which is detrimental to fiber uniformity. Furthermore, changing filters requires lifting the spindle, impacting production output.

[0047] In this utility model, reference is made to Figure 2 As shown, a multi-wire spinning head system is provided, comprising:

[0048] Main adhesive supply pipe 1 is configured to transport spinning solution;

[0049] Filter device 2 is configured to filter spinning solution;

[0050] N machine head boxes 3, each machine head box 3 has a glue port 36 on both sides;

[0051] A filter device 2 is installed at the glue inlet on one side of each of the Nn head boxes 3 and is connected to the main glue supply pipe 1; the glue inlet on the other side is connected to the balance pipe 4; the balance pipe 4 is connected to the glue inlets on both sides of the remaining n head boxes 3, and the spinning solution in the balance pipe 4 enters the remaining n head boxes 3.

[0052] The multi-wire spinning head system of this utility model connects one side of the glue outlets of Nn head boxes 3 through a balance pipe 4. The balance pipe 4 is connected to the two sides of the glue outlets of the remaining n head boxes 3. In this way, the glue outlets of N head boxes 3 are all connected, the pressure of each glue outlet is basically the same, and the maximum pressure difference between different glue outlets is reduced from 200Kpa to 30Kpa, resulting in more uniform yarn output and improved spinning uniformity.

[0053] Furthermore, since at least one nozzle in each spinneret box 3 is connected to other nozzles through the balance pipe 4, the supply of spinning solution to different spinneret boxes 3 is interconnected. When a spinneret box 3 needs to replace the filter device 2, the other spinneret boxes 3 can supply spinning solution to it through the balance pipe. In this way, the filter device 2 can be replaced without lifting the spindle (i.e., stopping the machine), which can ensure spinning output and reduce the workload of spinneret cleaning.

[0054] In this multi-line spinning head system, the temperature difference between the glue inlets on both sides of each head box 3 is significantly reduced. In the original method of glue inlet on both sides, the maximum temperature difference would reach 15℃, while in this invention, the maximum temperature difference between the glue inlets on both sides is reduced to 3℃, which is beneficial to improving the uniformity of the fibers.

[0055] To ensure sufficient glue supply to the remaining n machine head boxes 3, as one implementation method, Nn > n. That is, the number of machine head boxes 3 with one glue inlet connected to the main glue supply pipe 1 is greater than the number of machine head boxes 3 with glue inlets on both sides connected to the balance pipe. In this way, the glue from Nn machine head boxes 3 enters the balance pipe 4 and supplies it to n machine head boxes 3, which can ensure the glue supply to all machine head boxes 3.

[0056] In one implementation, the glue inlets on both sides of the remaining n machine head boxes 3 are connected to the balance pipe 4 through the first liquid inlet branch 37 and the second liquid inlet branch 38, respectively; the first liquid inlet branch 37 and the second liquid inlet branch 38 have the same length.

[0057] Since the glue inlets on both sides of the remaining n head boxes 3 are all connected to the balance pipe 4, and the pipe length and diameter of the glue inlets on both sides are the same, it can be ensured that the pressure and temperature of the glue entering the glue inlets on both sides are basically similar, avoiding large temperature differences and helping to ensure the uniformity of spinning.

[0058] In one implementation, N machine head boxes 3 are arranged side by side. The glue inlet on one side of the first N-1 machine head boxes 3 is connected to the main glue supply pipe 1, and the glue inlet on the other side is connected to the balance pipe 4 respectively; the glue inlets on both sides of the last machine head box 3 are connected to the balance pipe 4.

[0059] In this embodiment, n is 1. The first N-1 head boxes 3 have one glue inlet connected to the main glue supply pipe 1 and one glue inlet connected to the balance pipe 4. The filtered glue enters the balance pipe 4 to supply glue to both sides of the last head box 3. In this way, the glue supply to the last head box 3 is sufficient, and the glue inlet pressure of each head box 3 is basically the same.

[0060] In one implementation, the balance pipe 4 is equipped with an exhaust device 5 to facilitate the venting of gases from the pipe during operation.

[0061] In one embodiment, the exhaust device 5 is respectively installed at both ends of the balance pipe 4, and the balance pipe 4 between the two ends is connected to the rubber inlet on one or both sides of each head box 3 through multiple branch pipes.

[0062] In one embodiment, the balancing pipe 4 is provided with a pressure detection device 6, which can be a pressure sensor.

[0063] As one implementation, the balancing pipe 4 is equipped with a temperature detection device 7.

[0064] In one embodiment, each filter device 2 is provided with a temperature detection device 7 and a pressure detection device 6 at its outlet.

[0065] The temperature detection device 7 can be a temperature sensor.

[0066] Pressure and temperature sensors are added at both ends and in the middle of the balance pipe 4, and temperature sensors are added at the outlet of each precision filter to facilitate the detection of its operating status.

[0067] In one implementation, according to the flow direction of the spinning solution in the balance pipe 4, the number of filter devices 2 at the glue outlet of the upstream head box 3 is greater than the number of filter devices 2 in other head boxes 3.

[0068] In the multi-line spinning head system of this utility model, according to the flow direction of the spinning solution in the balance pipe 4, the number of filter devices 2 at the glue inlet of the upstream head box 3 is greater than the number of filter devices 2 in other head boxes 3. This can increase the glue inlet of the upstream head box 3, ensure the glue supply flow of the downstream head box 3 that needs to be supplied by the balance pipe, and ensure the stable production of the entire system.

[0069] Example 1

[0070] The multi-line spinning head system of this embodiment includes a main glue supply pipe 1, five head boxes 3 and a balance pipe 4;

[0071] The first spinning head box 31 has a first filter 21 and a second filter 22 arranged side-by-side at one end of its glue inlet, connected to the main glue supply pipe. The other end of the glue inlet is connected to the balance pipe 4 via a first branch pipe 41. The second spinning head box 32 has a third filter 23 at one end of its glue inlet, connected to the main glue supply pipe 1. The other end of the glue inlet is connected to the balance pipe 4 via a second branch pipe 42. The third spinning head box 33 has a fourth filter 24 at one end of its glue inlet, connected to the main glue supply pipe 1. The other end of the glue inlet is connected to the balance pipe via a third branch pipe 43. The fourth spinning head box 34 has a fifth filter 25 at one end of its glue inlet, connected to the main glue supply pipe 1. The other end of the glue inlet is connected to the balance pipe 4 via a fourth branch pipe 44. The filtered spinning solution in the balance pipe 4 enters the first inlet branch 37 and the second inlet branch 38 via the fifth branch pipe 45, and then enters the glue inlets on both sides of the fifth spinning head box 35. The balance pipe has exhaust valves at both ends and a pressure sensor and a temperature sensor in the middle.

[0072] Each filter is equipped with a temperature sensor and a pressure sensor at its outlet to determine the degree of clogging based on temperature changes. Each filter also has a control valve 8 at both its inlet and outlet. When a filter in one of the headboxes needs replacement, the control valves at both ends of the filter are closed. Without stopping the machine, the spinning solution filtered by other headboxes can temporarily supply the solution to that filter through the balancing pipeline. After replacing the filter, the control valves at both ends of the filter are opened to restore the original solution supply method.

[0073] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A multi-wire spinning head system, characterized in that, include: The main adhesive supply pipeline is configured to transport spinning solution. The filtration device is configured to filter the spinning solution; N head boxes, each with a glue port on both sides; A filter device is installed at the glue inlet on one side of each of the Nn head boxes and is connected to the main glue supply pipeline; the glue inlet on the other side is connected to the balance pipeline; the balance pipeline is connected to the glue inlets on both sides of the remaining n head boxes, and the spinning solution in the balance pipeline enters the remaining n head boxes; where Nn > n.

2. The multi-wire spinning head system according to claim 1, characterized in that, The remaining n machine head boxes have their respective inlets connected to the balance pipe via the first liquid inlet branch and the second liquid inlet branch; the first liquid inlet branch and the second liquid inlet branch are of the same length.

3. The multi-wire spinning head system according to claim 1 or 2, characterized in that, N head boxes are arranged side by side. The glue outlet on one side of the first N-1 head boxes is connected to the main glue supply pipe, and the glue outlet on the other side is connected to the balance pipe respectively. The glue outlets on both sides of the last head box are connected to the balance pipe.

4. The multi-wire spinning head system according to claim 1 or 2, characterized in that, The balancing pipe is equipped with an exhaust device.

5. The multi-wire spinning head system according to claim 4, characterized in that, The exhaust devices are respectively installed at both ends of the balance pipe, and the balance pipe between the two ends is connected to the rubber inlet on one or both sides of each head box through multiple branch pipes.

6. The multi-wire spinning head system according to claim 1 or 2, characterized in that, The balancing pipe is equipped with a pressure detection device.

7. The multi-wire spinning head system according to claim 1 or 2, characterized in that, The balancing pipe is equipped with a temperature detection device.

8. The multi-wire spinning head system according to claim 1 or 2, characterized in that, According to the flow direction of the spinning solution in the balance pipeline, the number of filter devices at the glue outlet of the upstream head box is greater than the number of filter devices in other head boxes.

9. The multi-wire spinning head system according to claim 1 or 2, characterized in that, Temperature detection devices are installed at the outlet of each filtration unit.

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