A device and method for isolating and cleaning filamentous impurities in a dry-jet wet spinning coagulation bath

Abstract

The present application relates to the general cleaning and dirt prevention technical field, especially relates to a kind of dry spray wet spinning coagulation bath filament impurity isolation cleaning device and method.The device includes coagulation bath tank, spinneret assembly, coagulation bath godet and vertically extractable partition, the partition separates the inside space of coagulation bath tank into the coagulation bath spinneret godet area in middle part and glove placement area located at its both sides;Glove placement area is provided with glove operating hole with sealed glove.The liquid level of each area coagulation bath is adjusted to consistent height before cleaning, and the partition is extracted under the condition that liquid level has no pressure difference, so that each area is connected, and the operator can clean the filament impurity on coagulation bath godet in line without disturbing the main process liquid level.The present application realizes the local isolation of coagulation bath hair in dry spray wet spinning process, zero liquid level disturbance cleaning, avoids spinneret plate paste plate risk, and guarantees the continuous and stable operation of spinning.

Description

Technical Field

[0001] This invention relates to the field of general cleaning and dirt removal technology, specifically to an isolation and cleaning device and method for filamentous impurities in the coagulation bath during dry-jet wet spinning processes, applicable to continuous spinning production processes such as polyacrylonitrile-based carbon fiber precursor. Background Technology

[0002] Dry-jet wet spinning is a widely used spinning method in the industrial production of high-performance carbon fiber precursor. In this process, the spinneret is positioned above the surface of the coagulation bath, and the fiber bundle enters the coagulation bath after passing through an air section of a certain length to complete coagulation and shaping. The stability of the air section length has a decisive influence on the uniformity of fiber structure and the quality of the finished product. Therefore, in actual production, the height of the coagulation bath surface is usually strictly controlled, with minimal allowable fluctuations.

[0003] During the coagulation process of dry-jet wet spinning, filamentous impurities such as fuzz, broken filaments, and tangled filaments can easily be generated at the guide rollers of the coagulation bath due to factors such as micro-defects in the spinneret, fluctuations in the spinning solution, sudden changes in interfacial tension between the dry and wet sections, disturbances in the flow field of the coagulation bath, or mechanical contact damage. Once these impurities become entangled on the guide rollers, if they are not cleaned in time, they will further lead to roller wrapping, increased filament breakage, spinneret clogging, and may even force the production line to stop for cleaning, seriously affecting production continuity and equipment utilization.

[0004] In existing technologies, long-handled scrapers or similar tools are typically used to remove the fuzz from the coagulation bath. However, this method has the following drawbacks:

[0005] If the tool enters the coagulation bath during operation, it can easily cause fluctuations in the liquid surface and disrupt the stability of the spinneret air section.

[0006] The cleaning location is at the underwater guide roller, which limits the field of vision and results in low operational precision.

[0007] Cleaning often requires reducing or stopping spinning operations, which affects continuous production.

[0008] There is a risk of scratching the guide rollers or spinneret assembly.

[0009] Therefore, how to achieve online cleaning of filamentous impurities in the coagulation bath without disturbing the main liquid surface of the coagulation bath or affecting the continuous operation of the spinneret has become a technical problem that urgently needs to be solved in the field of dry-jet wet spinning. Summary of the Invention

[0010] The purpose of this invention is to provide a device and method for isolating and cleaning filamentous impurities in a dry-jet wet spinning coagulation bath, so as to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a device for isolating and cleaning filamentous impurities in a dry-jet wet-spinning coagulation bath, comprising:

[0012] Solidification bath body;

[0013] The spinneret and coagulation bath guide roller are disposed in the coagulation bath.

[0014] At least two vertically insertable and retractable partitions divide the interior space of the coagulation bath into multiple areas that can be isolated from or connected to each other.

[0015] The plurality of regions include:

[0016] The coagulation bath spinneret and guide area is located in the middle. The spinneret assembly is located above this area. The filaments are ejected and enter below the surface of the coagulation bath liquid through the air section and bypass the coagulation bath guide roller.

[0017] The left glove placement area and the right glove placement area are located on both sides of the coagulation bath spinneret and guide area;

[0018] The tank walls corresponding to the left glove placement area and the right glove placement area are respectively provided with glove operation holes for sealing gloves, so that the operator can clean the filamentous impurities on the coagulation bath guide roller by using the sealed gloves when the partition is pulled out and the areas are connected, and the coagulation bath liquid level in the coagulation bath spinneret and guide area is not disturbed during the cleaning process.

[0019] Furthermore, when the partition is inserted into the working position, its lower end extends below the surface of the coagulation bath liquid and its upper end extends above the surface of the coagulation bath liquid, so as to isolate the left glove placement area, the coagulation bath spinneret guide area and the right glove placement area from each other in terms of fluid.

[0020] Furthermore, under normal operating conditions, the height of the coagulation bath liquid level in the coagulation bath spinneret guide area is a constant height h0, which is used to maintain the stability of the length of the spinneret air section.

[0021] Furthermore, the side wall or front wall of the coagulation bath is provided with a transparent observation window for observing the filamentous impurities on the coagulation bath guide roller when the partition is inserted.

[0022] Furthermore, the sealing glove provided on the glove operation hole is a flexible sealing glove resistant to corrosion by the coagulation bath medium.

[0023] A method for cleaning filamentous impurities in a dry-jet wet-spinning coagulation bath using the aforementioned device includes the following steps:

[0024] S1. Under normal spinning operation, the left glove placement area, the coagulation bath spinneret guide area and the right glove placement area are isolated from each other by a partition, and the coagulation bath liquid level in the coagulation bath spinneret guide area is kept at a constant height h0.

[0025] S2. When filamentous impurities are observed on the coagulation bath guide roller, the operator puts both hands into the sealed gloves in the left glove placement area and the right glove placement area, respectively.

[0026] S3. Adjust the height of the coagulation bath liquid level in the left glove placement area and the right glove placement area to make it consistent with the height h0 of the coagulation bath liquid level in the coagulation bath spinneret and guide area;

[0027] S4. With the liquid level in each area being the same, the partition is pulled out vertically and smoothly to connect the left glove placement area, the coagulation bath spinneret guide area and the right glove placement area, and the coagulation bath liquid level remains stable during the connection process.

[0028] S5. The operator enters the coagulation bath spinneret and guide area through sealed gloves to clean the filamentous impurities on the coagulation bath guide roller. During the cleaning process, the spinneret continuously spins filaments and the filament bundle runs continuously.

[0029] S6. After cleaning, the operator exits the coagulation bath spinneret area and reinserts the partition into the working position to restore the isolation state of each area.

[0030] Furthermore, in step S3, the liquid level in the left glove placement area and the right glove placement area is adjusted by removing or replenishing the coagulation bath liquid.

[0031] Furthermore, in step S4, since the liquid level is consistent in each region before connection, no flow driving force that causes fluctuations in the coagulation bath liquid level is generated during the process of removing the baffle and connecting the regions.

[0032] Furthermore, the filamentous impurity removal process is completed without changing the length of the spinneret air section.

[0033] Furthermore, the filamentous impurities are fuzzy fibers generated during the dry-jet wet spinning process and entangled on the coagulation bath guide roller.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] By combining partition partitioning with liquid level pre-leveling, zero liquid level disturbance can be achieved when the local area of ​​the coagulation bath is connected;

[0036] By setting up a transparent observation window, the cleaning process becomes visible and controllable, significantly improving operational safety and accuracy;

[0037] The process of cleaning fuzz is completed without stopping the spinning process or changing the length of the air section, ensuring continuous production.

[0038] Avoid having operating tools directly enter the spinneret area to reduce the risk of spinneret clogging;

[0039] It is suitable for dry-jet wet spinning production lines that have extremely high requirements for process stability, such as high-end carbon fiber precursor. Attached Figure Description

[0040] Figure 1 : Schematic diagram of the structure of the device for isolating and cleaning filamentous impurities in the coagulation bath according to the present invention.

[0041] In the diagram: 1. Coagulation bath tank; 2. Glove operating hole; 3. Transparent observation window; 4. Spinneret assembly; 5. Baffle; 6. Coagulation bath guide roller; 7. Left glove placement area; 8. Coagulation bath spinneret and guide area; 9. Right glove placement area. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0043] like Figure 1 As shown, one embodiment of the present invention provides an isolation and cleaning device for filamentous impurities in a dry-jet wet spinning coagulation bath, comprising: a coagulation bath tank 1, a glove operation hole 2, a transparent observation window 3, a spinneret assembly 4, two partitions 5, a coagulation bath guide roller 6, a left glove placement area 7, a coagulation bath spinneret guide area 8, and a right glove placement area 9.

[0044] The spinneret 4 and the coagulation bath guide roller 6 are disposed within the coagulation bath tank 1. The spinneret 4 is fixedly installed on the upper part of the coagulation bath tank 1, with the spinneret nozzle facing downwards, located directly above the coagulation bath spinneret and guide area 8. A preset distance is maintained between the spinneret surface of the spinneret 4 and the surface of the coagulation bath liquid to form a stable air section for spinning. The coagulation bath guide roller 6 is rotatably installed on the lower part of the coagulation bath tank 1, located within the coagulation bath spinneret and guide area 8. Its axis is arranged horizontally, and it is used to guide and deflect the filaments ejected from the spinneret 4 and entering the coagulation bath, causing the filaments to form a predetermined path within the coagulation bath.

[0045] Two partitions 5 can be vertically inserted into and removed from the interior of the coagulation bath 1. The two partitions 5 divide the interior space of the coagulation bath 1 into three regions that can be isolated from each other or connected to each other. The three regions are: the coagulation bath spinneret guide region 8 located in the middle, and the left glove placement region 7 and the right glove placement region 9 located on both sides of the coagulation bath spinneret guide region 8. When the partitions 5 are inserted into the working position, their lower ends extend below the surface of the coagulation bath liquid and their upper ends extend above the surface of the coagulation bath liquid, so as to isolate the left glove placement region 7, the coagulation bath spinneret guide region 8 and the right glove placement region 9 from each other in terms of fluid.

[0046] Furthermore, to reduce liquid surface disturbance when the baffle 5 is withdrawn, the baffle 5 adopts a thin-walled structure with reduced thickness, and has an arc-shaped transition section at its lower end, with flexible sealing strips embedded on both sides and the bottom. The lower part of the baffle 5 also has several flow-limiting holes, which are circular through holes arranged in a matrix, used to balance the liquid pressure on both sides when the baffle 5 is withdrawn, reducing liquid surface disturbance. Simultaneously, a lifting drive structure can be provided to control the uniform lifting and lowering of the baffle 5.

[0047] The spinneret 4 is located above the spinneret guide area 8 in the coagulation bath. The ejected filaments enter below the surface of the coagulation bath liquid through the air section and pass around the coagulation bath guide roller 6. Under normal operating conditions, the height of the coagulation bath liquid level in the spinneret guide area 8 is a constant height h0. This constant height is used to maintain a stable length of the spinneret air section.

[0048] A transparent observation window 3 is provided on the side wall or front wall of the coagulation bath 1, and is used to observe the filamentous impurities on the coagulation bath guide roller 6 when the partition 5 is inserted.

[0049] The left glove placement area 7 and the right glove placement area 9 are respectively provided with glove operation holes 2 with sealed gloves on the tank wall. The sealed gloves are flexible sealed gloves that are resistant to the corrosion of the coagulation bath medium, so that the operator can clean the filamentous impurities on the coagulation bath guide roller 6 with the sealed gloves when the partition 5 is pulled out and the areas are connected, and the coagulation bath liquid level in the coagulation bath spinneret guide area 8 is not disturbed during the cleaning process.

[0050] Based on the same inventive concept, this embodiment also provides a method for cleaning filamentous impurities in a dry-jet wet spinning coagulation bath using the above-mentioned device. This method can achieve online cleaning of filamentous impurities without affecting normal spinning operation, and specifically includes the following steps:

[0051] S1. Under normal spinning operation, the left glove placement area 7, the coagulation bath spinneret guide area 8 and the right glove placement area 9 are isolated from each other by the partition 5, and the coagulation bath liquid level in the coagulation bath spinneret guide area 8 is kept at a constant height h0.

[0052] S2. When filamentous impurities are observed on the coagulation bath guide roller 6, the filamentous impurities are hairs generated during the dry-jet wet spinning process and wrapped around the coagulation bath guide roller 6. The operator puts both hands into the sealed gloves in the left glove placement area 7 and the right glove placement area 9 respectively.

[0053] S3. Adjust the liquid level in the left glove placement area 7 and the right glove placement area 9 by removing or replenishing the coagulation bath liquid, so that it is consistent with the coagulation bath liquid level h0 in the coagulation bath spinneret and guide area 8.

[0054] S4. With the liquid level in each area being the same, the partition 5 is pulled out vertically and smoothly, so that the left glove placement area 7, the coagulation bath spinneret guide area 8 and the right glove placement area 9 are connected. Since the liquid level in each area is the same before connection, no flow driving force that causes the coagulation bath liquid level to fluctuate is generated during the pulling out of the partition 5 and the connection of the areas, so that the coagulation bath liquid level remains stable during the connection process.

[0055] S5. The operator enters the coagulation bath spinneret and guide area 8 through sealed gloves to clean the filamentous impurities on the coagulation bath guide roller 6. The cleaning is completed under the condition that the spinneret 4 continues to spin, the filament bundle runs continuously, and the length of the spinneret air section is not changed.

[0056] S6. After cleaning, the operator exits the coagulation bath spinneret and guide wire area 8, and reinserts the partition 5 into the working position to restore the isolation state of each area.

Claims

1. A method for isolating and cleaning filamentous impurities in a dry-jet wet-spinning coagulation bath, characterized in that, A separation and cleaning device is used, the device comprising: Solidification bath body (1); The spinneret assembly (4) and the coagulation bath guide roller (6) are installed inside the coagulation bath tank (1). At least two vertically insertable and removable partitions (5) divide the interior space of the coagulation bath (1) into multiple areas that can be isolated from or connected to each other; The plurality of regions include: The coagulation bath spinneret guide area (8) is located in the middle, and the spinneret assembly (4) is located above this area. The spinneret enters the coagulation bath liquid surface through the air section and passes around the coagulation bath guide roller (6). The left glove placement area (7) and the right glove placement area (9) are located on both sides of the coagulation bath spinneret and guide area (8). The left glove placement area (7) and the right glove placement area (9) are respectively provided with glove operation holes (2) with sealed gloves on the tank walls, so that the operator can clean the filamentous impurities on the coagulation bath guide roller (6) with sealed gloves when the partition (5) is pulled out and the areas are connected, and the coagulation bath liquid level in the coagulation bath spinneret guide area (8) is not disturbed during the cleaning process. The method includes the following steps: S1. Under normal spinning operation, the left glove placement area (7), the coagulation bath spinneret guide area (8) and the right glove placement area (9) are isolated from each other by the partition (5), and the coagulation bath liquid level in the coagulation bath spinneret guide area (8) is kept at a constant height h0. S2. When filamentous impurities are observed on the coagulation bath guide roller (6), the operator puts both hands into the sealed gloves in the left glove placement area (7) and the right glove placement area (9), respectively. S3. Adjust the height of the coagulation bath liquid level in the left glove placement area (7) and the right glove placement area (9) to make it consistent with the height h0 of the coagulation bath liquid level in the coagulation bath spinneret and guide area (8); S4. With the liquid level in each area being the same, the partition (5) is pulled out vertically and smoothly, so that the left glove placement area (7), the coagulation bath spinneret guide area (8) and the right glove placement area (9) are connected, and the liquid level in the coagulation bath remains stable during the connection process. S5. The operator enters the coagulation bath spinneret and guide area (8) through sealed gloves to clean the filamentous impurities on the coagulation bath guide roller (6), and the spinneret assembly (4) continues to spin and the filament bundle runs continuously during the cleaning process; S6. After cleaning, the operator exits the coagulation bath spinneret guide area (8) and reinserts the partition (5) into the working position to restore the isolation state of each area.

2. The method according to claim 1, characterized in that: When the partition (5) is inserted into the working position, its lower end extends below the surface of the coagulation bath liquid and its upper end extends above the surface of the coagulation bath liquid, so as to isolate the left glove placement area (7), the coagulation bath spinneret guide area (8) and the right glove placement area (9) from each other in terms of fluid.

3. The method according to claim 1 or 2, characterized in that: Under normal operating conditions, the height of the coagulation bath liquid level in the coagulation bath spinneret guide area (8) is a constant height h0, which is used to maintain the stability of the length of the spinneret air section.

4. The method according to claim 1, characterized in that: The side or front wall of the coagulation bath tank (1) is provided with a transparent observation window (3) for observing the filamentous impurities on the coagulation bath guide roller (6) when the partition (5) is inserted.

5. The method according to claim 1, characterized in that: The sealing glove installed on the glove operation hole (2) is a flexible sealing glove resistant to corrosion by the coagulation bath medium.

6. The method according to claim 1, characterized in that: In step S3, the liquid level in the left glove placement area (7) and the right glove placement area (9) is adjusted by removing or replenishing the coagulation bath liquid.

7. The method according to claim 1, characterized in that: In step S4, since the liquid level is consistent in each region before connection, no flow driving force that causes fluctuation of the solidification bath liquid level is generated during the process of the partition (5) being pulled out and the regions being connected.

8. The method according to claim 1, characterized in that: The process of removing filamentous impurities is completed without changing the length of the spinneret air section.

9. The method according to claim 1, characterized in that: The filamentous impurities are fuzzy fibers generated during the dry-jet wet spinning process and wrapped around the coagulation bath guide roller (6).

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