Efficient washing equipment for polyimide fiber production

Abstract

The utility model discloses efficient washing equipment for polyimide fiber production, which comprises an equipment rack, a driving roller group, a top shower pipeline and a plurality of waterfall washing plates, a soaking water tank is arranged at the lower part in the equipment rack, and the driving roller group comprises a plurality of lower driving rollers which are arranged in the soaking water tank and are distributed in a row at intervals; the plurality of upper transmission rollers are arranged in the equipment rack above the soaking water tank and are distributed in a row at intervals, the plurality of upper transmission rollers and the plurality of lower transmission rollers are vertically staggered, and the cellosilk is wound between the plurality of upper transmission rollers and the plurality of lower transmission rollers in a snakelike manner. The top flushing pipeline outputs washing liquid to the position above the upper transmission roller, the multiple waterfall washing plates are distributed between the upper transmission roller and the lower transmission roller in a row at intervals, and each waterfall washing plate is provided with an inclined face used for allowing fibers to pass through. The soaking water tank is divided into the multiple soaking and washing tanks by the multiple partition plates, washing liquid of the next-stage soaking and washing tank is circularly pumped into the waterfall washing plate above the previous-stage soaking and washing tank, and the washing liquid can be fully utilized.

Description

Technical Field

[0001] This utility model relates to the field of water washing equipment technology, and in particular to a high-efficiency water washing equipment for the production of polyimide fibers. Background Technology

[0002] Polyimide fiber is produced by using a dry-wet spinning process to spin slightly gelled polyamic acid to a certain degree of pre-imidization. The slightly gelled polyamic acid is extruded through a spinneret and then enters a coagulation bath through an air layer. After washing and drying, partially imidized fibers are obtained, which are then thermally cyclized to produce polyimide fibers. Washing is a crucial step in the wet spinning process of polyimide fibers. Washing with a washing solution removes polymer solvents and organic and inorganic impurities adhering to the fiber surface to obtain higher-performance polyimide fibers. Incomplete washing leaves a large amount of solvent residue inside and on the surface of the fiber, which is detrimental to subsequent imidization and stretching. During the heating and imidization process of the nascent fiber, a large amount of solvent evaporates, creating voids inside the fiber, reducing its density and significantly decreasing its mechanical properties. Most washing equipment currently uses a single, multi-stage spray washing method, which involves using a large amount of clean deionized water pressurized by a water pump and sprayed onto multiple rotating yarn rollers. This method results in a short contact time between the water and the fiber, incomplete rinsing, and solvent residue on the yarn surface, leading to severe yarn sticking and bundling. The imidized yarn has poor dispersion and flexibility, and this washing method wastes a large amount of deionized water. Utility Model Content

[0003] In view of this, this utility model proposes a high-efficiency water washing equipment for the production of polyimide fibers. The achievement lies in reducing the amount of water washing liquid used, allowing the nascent fibers to enter the water washing equipment for spraying, rinsing and soaking. The longer the contact time between the fiber and deionized water, the more beneficial it is for the bidirectional penetration of the solvent inside the fiber, so that the fiber can fully wash away impurities and solvents.

[0004] The technical solution disclosed in this utility model is a high-efficiency washing equipment for polyimide fiber production, including a frame, a drive roller assembly within the frame, a top shower pipe, and multiple cascading wash plates. The lower part of the frame is a soaking tank. The drive roller assembly includes multiple lower drive rollers arranged in a row at intervals within the soaking tank, and multiple upper drive rollers arranged in a row at intervals within the frame above the soaking tank. The upper and lower drive rollers are staggered vertically. Fiber filaments are wound in a serpentine pattern between the upper and lower drive rollers, and the ends of the fiber filaments are equipped with take-up rollers that pull and wind them up. The take-up rollers are driven by a motor. The top shower pipe has multiple branch pipes, each with a shower nozzle at both ends, facing the upper drive rollers. Washing liquid is introduced into the top shower pipe. The multiple cascading wash plates are arranged in a row at intervals between the upper and lower drive rollers, and each wash plate has an inclined surface where the fiber filaments abut against the upper and lower drive rollers in a serpentine pattern.

[0005] The soaking tank is divided into multiple soaking and washing tanks along the fiber filament's forward direction by multiple partitions. The height of the partitions is higher than the height of the lower drive roller. The side wall of the first soaking and washing tank near the fiber filament's entry side is provided with an overflow port, and the height of the overflow port is close to the height of the partitions.

[0006] Furthermore, a guide wheel is provided on the frame of the equipment near the leftmost and rightmost upper drive rollers, and the apex of the guide wheel is at the same height as the apex of the upper drive roller.

[0007] Furthermore, a partition is provided in the soaking water tank every two lower drive rollers, or every one lower drive roller. Along the direction of fiber advance, the washing liquid in the subsequent soaking and washing tank is pumped through a pipe to the corresponding cascading washing plate above the previous soaking and washing tank for output.

[0008] Furthermore, a filter is provided at the end of the pipe connecting the water pump inside the soaking water washing tank.

[0009] Furthermore, the pipe connecting the water pump in the soaking water washing tank is equipped with a digital display flow control valve.

[0010] Furthermore, the top shower pipe is equipped with a digital display flow control valve.

[0011] Furthermore, a partition door is provided on the front of the equipment frame above the soaking water tank, and the partition door is made of acrylic material.

[0012] Furthermore, the upper edge of the outer wall of the soaking tank and the edge of the corresponding equipment frame above the outer wall of the soaking tank are provided with guide rails for installing partition doors. The partition doors are sliding doors composed of multiple acrylic plates that can move left and right.

[0013] The beneficial effects of this utility model are as follows: The high-efficiency washing equipment designed by this technical solution is mainly used for the production of polyimide fibers. This washing equipment achieves a serpentine traction of the nascent polyimide fiber filaments, performing a three-stage washing process: top rinsing, a sloping waterfall washing plate in the middle, and bottom soaking. Soaking allows for a longer contact time between the fiber filaments and deionized water, facilitating bidirectional penetration of the solvent within the fiber and removing impurities and solvents. The bottom soaking tank is pre-filled with washing liquid, and the top rinsing pipe rinses the fiber filaments pulled by the upper drive roller. Some of the washing liquid flows to the waterfall washing plate, where the sloping water flow is slower, reducing the pulling force on the fiber and preventing damage to the internal structure of the fiber.

[0014] Furthermore, the soaking tank is divided into multiple soaking and washing tanks by partitions, forming a multi-stage soaking and washing tank system along the fiber's forward direction. The first-stage soaking and washing tank is located near the fiber entry end, followed by the second, third, and so on, sequentially moving forward. Each stage of the soaking and washing tank corresponds to a top rinse and a middle waterfall rinse, resulting in progressively higher cleanliness. Simultaneously, the washing liquid from the next stage is circulated to the waterfall rinse plate above the previous stage, maximizing the utilization of the washing liquid and conserving its consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-efficiency water washing equipment of this utility model.

[0016] Figure 2 A schematic diagram illustrating the effect of the high-efficiency water washing equipment of this utility model with a baffle door.

[0017] Figure label:

[0018] 1. Equipment frame; 2. Lower drive roller; 3. Upper drive roller; 4. Top shower pipe; 41. Branch pipe; 5. Waterfall plate; 6. Baffle plate; 7. Water pump; 8. Filter; 9. Overflow outlet; 10. Fiber filament; 11. Guide roller; 101. First-stage soaking and washing tank; 102. Second-stage soaking and washing tank; 103. Third-stage soaking and washing tank. Detailed Implementation

[0019] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this disclosure.

[0020] Please refer to Figure 1 This technical solution provides a high-efficiency washing equipment for polyimide fiber production, comprising a frame 1, a drive roller assembly within the frame 1, a top shower pipe 4, and multiple cascading washing plates 5. The lower part of the frame 1 is a soaking tank. The drive roller assembly includes multiple lower drive rollers 2 arranged in a row at intervals within the soaking tank, and multiple upper drive rollers 3 arranged in a row at intervals within the frame 1 above the soaking tank. The upper drive rollers 3 and lower drive rollers 2 are staggered vertically. Fiber filaments 10 are wound in a serpentine pattern between the upper drive rollers 3 and lower drive rollers 2. The ends of the fiber filaments 10 are equipped with take-up rollers that pull and wind them up, and the take-up rollers are driven by a motor. The top shower pipe 4 has multiple branch pipes 41, each with shower nozzles at both ends. The shower nozzles are positioned directly above the upper drive rollers 3, and the top shower pipe 4 receives washing liquid. The multiple cascading wash plates 5 are arranged in a row at intervals between the upper drive roller 3 and the lower drive roller 2. Each cascading wash plate 5 has an inclined surface where the fiber filaments 10 abut against the upper drive roller 3 and the lower drive roller 2 in a serpentine pattern. The soaking tank is divided into multiple soaking and washing tanks along the direction of fiber filament 10 travel by multiple partitions 6. The height of the partitions 6 is higher than the height of the lower drive roller 2. An overflow port 9 is provided on the side wall of the first soaking and washing tank near the entry side of the fiber filament 10. The height of the overflow port 9 is close to the height of the partition 6. By dividing the soaking tank into multiple soaking and washing tanks, the concentration of impurities and solvents in the washing liquid in the soaking and washing tanks along the direction of fiber filament 10 travel gradually decreases, preventing them from mixing together. This facilitates the graded cleaning of the washing liquid and achieves the cleaning purpose.

[0021] As a preferred embodiment, a partition 6 is provided in the soaking water tank every two lower drive rollers 2, or every one lower drive roller 2. Along the forward direction of the fiber filament 10, the washing liquid in the subsequent soaking and washing tank is pumped to the corresponding cascading washing plate 5 above the previous soaking and washing tank via a pipe connected to a water pump 7, forming a recycled washing liquid. The cleaning liquid is then sequentially transported to the cascading washing plate 5 of the next level for cascading washing of the fiber filament. This is beneficial for making full use of the washing liquid and saving the consumption of the washing liquid. The washing liquid is usually deionized water.

[0022] This washing equipment achieves a serpentine traction of the nascent polyimide fiber filaments 10, followed by a three-stage washing process: top rinsing, a sloping waterfall washing plate 5 in the middle, and bottom soaking. Soaking allows for a longer contact time between the fiber filaments 10 and deionized water, facilitating bidirectional penetration of the solvent within the fiber and removing impurities and solvents. The bottom soaking tank is pre-filled with washing liquid, while the top rinsing pipe 4 irrigates the fiber filaments 10 pulled by the upper drive roller 3. Some of the washing liquid flows to the waterfall washing plate 5, where the slow, sloping water flow reduces the pulling force on the fiber, preventing damage to the internal fiber structure.

[0023] This solution divides the soaking water tank into multiple soaking and washing tanks by partition 6, forming a multi-level soaking and washing tank along the forward direction of the fiber filament 10. The soaking and washing tank closest to the entry end of the fiber filament 10 is the first-level soaking and washing tank 101, and then the second-level soaking and washing tank 102, the third-level soaking and washing tank 103, and so on, in sequence towards the forward direction of the fiber filament 10. Each level of soaking and washing tank corresponds to the top rinsing and the middle waterfall washing, and the cleanliness of the soaking and washing tank will continuously improve with each level.

[0024] As a preferred embodiment, a guide wheel 11 is provided on the frame 1 of the equipment, near the leftmost and rightmost upper transmission rollers 3 respectively. The apex of the guide wheel 11 is at the same height as the apex of the upper transmission roller 3, making it easier to drive the fiber filament 10 through the guide wheel 11.

[0025] As a preferred embodiment, the end of the pipe connecting the water pump 7 in the soaking and washing tank is equipped with a filter 8. The filter 8 prevents the fiber from breaking repeatedly during the washing process, which could lead to the fiber filaments 10 entering the next process and affecting the quality of the product.

[0026] As a preferred embodiment, the pipe connecting the water pump 7 in the soaking water washing tank is equipped with a digital display flow control valve, and the top shower pipe 4 is equipped with a digital display flow control valve to facilitate flow balance adjustment.

[0027] Reference Figure 1 , Figure 2 As a preferred embodiment, a partition door made of acrylic material is provided on the front of the equipment frame 1 above the soaking tank. Guide rails for installing the partition door are provided on the upper edge of the outer wall of the soaking tank and the edge of the equipment frame 1 above the outer wall of the soaking tank. The partition door is a sliding door composed of multiple acrylic panels that moves left and right. Through the acrylic partition door, the internal situation can be observed, and it also serves to prevent splashing washing liquid.

[0028] It should be noted that the structural diagram shown in the accompanying drawings is only a partial view of the device. As needed, more soaking and washing tanks can be added to the right side of the device to create more stages of washing.

[0029] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A high-efficiency water washing device for polyimide fiber production, characterized in that, include: The equipment frame, the lower part of which is a soaking water tank; The transmission roller assembly includes multiple lower transmission rollers arranged in a row at intervals in the soaking water tank, and multiple upper transmission rollers arranged in a row at intervals in the equipment frame above the soaking water tank. The multiple upper transmission rollers and multiple lower transmission rollers are staggered vertically. The fiber filaments are wound in a serpentine shape between the multiple upper transmission rollers and lower transmission rollers. The ends of the fiber filaments are provided with take-up rollers that pull and wind them up. The take-up rollers are driven to rotate by a motor. The top shower pipe has multiple branch pipes, and each branch pipe has a shower nozzle at both ends. The shower nozzle is directly above the upper drive roller, and the top shower pipe is supplied with washing liquid. Multiple cascading washers are arranged in a row between the upper and lower drive rollers at intervals. Each cascading washer has an inclined surface that abuts when the fiber filaments are wound in a serpentine shape around the upper and lower drive rollers. The soaking tank is divided into multiple soaking and washing tanks along the fiber filament's forward direction by multiple partitions. The height of the partitions is higher than the height of the lower drive roller. The side wall of the first soaking and washing tank near the fiber filament's entry side is provided with an overflow port, and the height of the overflow port is close to the height of the partitions.

2. The high-efficiency water washing equipment for polyimide fiber production according to claim 1, characterized in that, The equipment frame is equipped with a guide wheel at the position of the upper drive roller near the leftmost and rightmost positions, and the top of the guide wheel is at the same height as the top of the upper drive roller.

3. The high-efficiency water washing equipment for polyimide fiber production according to claim 1, characterized in that, The soaking tank is equipped with a partition every two lower drive rollers, or every one lower drive roller. Along the direction of fiber advance, the washing liquid in the subsequent soaking and washing tank is pumped through a pipe to the corresponding cascading washing plate above the previous soaking and washing tank for output.

4. The high-efficiency water washing equipment for polyimide fiber production according to claim 3, characterized in that, The pipe connecting the water pump inside the soaking water washing tank is equipped with a filter.

5. The high-efficiency water washing equipment for polyimide fiber production according to claim 3, characterized in that, The pipe connecting the water pump in the soaking water washing tank is equipped with a digital flow control valve.

6. The high-efficiency water washing equipment for polyimide fiber production according to claim 1, characterized in that, The top shower pipe is equipped with a digital flow control valve.

7. The high-efficiency water washing equipment for polyimide fiber production according to claim 1, characterized in that, A partition door is provided on the front of the equipment frame above the soaking water tank, and the partition door is made of acrylic material.

8. The high-efficiency water washing equipment for polyimide fiber production according to claim 7, characterized in that, The upper edge of the outer wall of the soaking tank and the edge of the corresponding equipment frame above the outer wall of the soaking tank are provided with guide rails for installing partition doors. The partition doors are sliding doors composed of multiple acrylic plates that can move left and right.

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