Dry PAN-based carbon fiber precursor solvent wave washing device

Abstract

This utility model belongs to the field of carbon fiber preparation technology, specifically relating to a solvent wave-generating washing device for dry-process PAN-based carbon fiber precursor. The device includes a delivery pump connected to a primary, secondary, and tertiary washing tank via pipelines. Spray guns and washing water inlets are installed on the side walls of both the primary and secondary washing tanks. Wave-generating pumps are installed on the bottom walls of all three tanks, and a conveyor roller assembly is installed at the precursor output end above the primary and tertiary washing tanks. This dry-process PAN-based carbon fiber precursor solvent wave-generating washing device utilizes wave-generating pumps at the bottom of the tanks to enhance mass transfer through dynamic wave water, promoting solvent diffusion from internal pores to the outside, shortening washing time, and reducing energy consumption. Furthermore, the combination of a spray device, an extrusion device, and multi-stage washing tanks improves washing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of carbon fiber preparation technology, specifically relating to a dry PAN-based carbon fiber precursor solvent wave washing device. Background Technology

[0002] As a strategic new material, the core of carbon fiber's preparation technology lies in the quality control of the precursor fiber. Dry spinning, due to its dense fiber structure and excellent mechanical properties, has become the mainstream technology for high-end carbon fiber production. However, regardless of the precursor fiber production process used, residual solvents in the precursor fiber must be washed with water to prevent them from affecting the performance of the finished carbon fiber product.

[0003] Currently, the main methods for washing carbon fiber precursor include: immersion, spraying, and ultrasonic methods. However, traditional immersion or countercurrent spraying methods are difficult to break through the mass transfer barrier of the dense structure of the fiber cortex, and ultrasonic methods are very easy to damage the fiber and cause damage to the precursor.

[0004] CN214142842U discloses a washing device for large-tow carbon fiber precursors. Through a multi-stage reverse circulation and dynamic traction design, namely, using reverse circulation spraying of washing liquid, combined with angle control of the stretching roller group and a double-sided spraying system, it effectively solves the problems of poor uniformity and high solvent residue in the washing of large-tow precursors, and achieves high removal efficiency, dynamic uniformity assurance and process stability. However, it has problems such as complex equipment, twice the number of spray pipes as the number of yarns, the need for precise matching of nozzle layout with the width of the filament bundle, high installation and debugging difficulty, and high energy consumption due to pump circulation and multi-stage series design.

[0005] CN118792744A discloses a 75k carbon fiber precursor, its preparation method, carbon fiber, and washing equipment. The washing equipment uses polygonal beating rollers with a central angle of 18°-45° set in the washing tank. The fiber bundle comes into contact with the roller edges during operation. Through periodic pressing and rebound, the fiber bundle is dispersed and solvent diffusion is promoted, reducing the phenomena of tangled and sticky fibers, and improving the dispersion and uniformity of the fiber bundle. However, the polygonal beating rollers require high processing precision and are prone to wear after long-term operation, which affects the washing effect. In addition, the frequent pressure and rebound of the fiber bundle can easily cause fuzz on the fiber surface. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a solvent wave washing device for dry PAN-based carbon fiber precursors. By setting multiple sets of variable frequency wave pumps at the bottom of the water tank, the mass transfer is enhanced by dynamic wave water, which promotes the diffusion of solvent from the internal pores to the outside, shortens the washing time, and reduces energy consumption. At the same time, the combination of spray device, extrusion device and multi-stage washing tank improves the efficiency of water washing.

[0007] The dry-process PAN-based carbon fiber precursor solvent wave-making washing device of this utility model includes a conveying pump, which is equipped with pipelines connected to a primary washing tank, a secondary washing tank, and a tertiary washing tank for conveying washing water. Spray guns and washing water inlets are installed on the side walls of both the primary and secondary washing tanks, wherein the spray guns are used to pre-wet the input precursor fibers. Wave-making pumps are installed on the bottom walls of the primary, secondary, and tertiary washing tanks, and heated rollers are installed above each wave-making pump for conveying the precursor fibers during the washing process. A conveyor roller assembly is installed at the precursor fiber output end above the primary and tertiary washing tanks. The conveyor roller assembly includes an upper roller and a lower roller, the center points of which are located on the same vertical line, and the conveyor roller assembly is used to compress the precursor fibers.

[0008] Preferably, the primary, secondary, and tertiary washing tanks are all equipped with concentration and temperature detection devices, and each has a drain pipe at the bottom. Furthermore, the concentration detection devices on the primary, secondary, and tertiary washing tanks are used to detect the concentration of the washing water, facilitating regular drainage and replacement of the washing water.

[0009] Preferably, the pipeline connecting the delivery pump and the primary washing tank is equipped with a primary washing tank delivery valve and a primary three-way valve. Two branch lines are provided after the primary three-way valve, which are respectively connected to the spray gun and the washing water inlet on the primary washing tank. Furthermore, the primary washing tank delivery valve and the primary three-way valve form a control loop with the concentration detection device to realize timely replacement of the washing water.

[0010] Preferably, the pipeline connecting the delivery pump and the secondary washing tank is equipped with a secondary washing tank delivery valve and a secondary three-way valve. Two branch lines are provided after the secondary three-way valve, which are respectively connected to the spray gun and the washing water inlet on the secondary washing tank. Furthermore, the working principle of the secondary washing tank delivery valve and the secondary three-way valve is the same as that of the primary washing tank delivery valve and the primary three-way valve.

[0011] Preferably, a tertiary washing tank conveying valve is installed on the pipeline connecting the conveying pump and the tertiary washing tank, and a pipeline for returning to the secondary washing tank is installed at the bottom of one side wall of the tertiary washing tank; furthermore, when the washing water in the secondary washing tank is replaced, the washing water returned from the tertiary washing tank is used preferentially.

[0012] Preferably, a conveying channel is provided on the side wall of the raw filament input end of the three-stage washing tank for conveying raw filament. Furthermore, the conveying of raw filament between each washing tank is achieved by a transmission roller.

[0013] Preferably, the primary and secondary washing pools are located on the same horizontal plane, and the tertiary washing pool is higher than the secondary washing pool. Furthermore, the height difference between the tertiary and secondary washing pools is designed so that the washing water overflows into the secondary washing pool under the action of gravity, thereby realizing the circulation of washing water.

[0014] Preferably, the wave-generating pump consists of a base, a rotating shaft, and a wave-generating assembly connected in sequence. The wave-generating assembly has blades installed inside its cavity for generating waves. The blades are connected to a power supply mechanism, and a housing is provided outside the blades and the power supply mechanism. A protective net is connected around the base, and the protective net covers the wave-generating pump on all sides and top. Furthermore, the rotating shaft can be used to adjust the direction of the wave-generating assembly, and the protective net is used to protect against and reduce the water vortices caused by the wave-generating assembly.

[0015] Specifically, the dry-process PAN-based carbon fiber precursor solvent wave-making washing device of this utility model operates as follows: In the initial washing stage, washing water of different temperatures is delivered to the primary washing tank, secondary washing tank, and tertiary washing tank via a conveyor pump. Under the action of the conveyor device, the precursor enters the primary washing tank, where spray guns on the side wall are activated to pre-wet the precursor. Under the action of the hot rollers, the precursor undergoes solvent washing in the water. At this time, the wave-making pump is activated, and the washing water soaks and washes the pre-wetted precursor. After washing in the primary washing tank, the precursor passes through a conveyor roller assembly, consisting of an upper and lower roller, which squeezes the precursor to expel some solution. The precursor then enters the secondary washing tank for repeated washing. After washing in the secondary washing tank, the precursor is directly conveyed to the tertiary washing tank without further squeezing. The tertiary washing tank is high-temperature... In the secondary washing tank, the raw yarn enters through the conveyor channel on the side wall for final washing. After washing, it is squeezed by the conveyor roller group and enters the subsequent device. During the raw yarn washing process, all three washing tanks are equipped with concentration detection devices. When the concentration exceeds the process concentration, the wave pump shuts down, the sewage pipes at the bottom of the primary and secondary washing tanks are connected to discharge the sewage, and the primary three-way valve is connected to the washing water inlet to deliver the washing water. The washing water in the secondary washing tank is supplied by the tertiary washing tank, and the washing water in the tertiary washing tank is delivered by the conveyor pump through the tertiary washing tank conveyor valve. At the same time, in order to ensure the solvent dissolution rate, all three washing tanks can be connected to steam pipelines to heat the washing water. Temperature detection devices are also equipped to monitor the entire process. The valve opening can be adjusted according to the real-time water temperature in the tank to control the steam flow and thus achieve temperature regulation.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The dry PAN-based carbon fiber precursor solvent wave washing device of this utility model has multiple sets of variable frequency wave pumps arranged at intervals along the length direction at the bottom of the washing tank, which improves the mass transfer efficiency and accelerates the solvent removal rate. Combined with the spray gun, it shortens the precursor washing time; the solvent residue is reduced at the same time; the dynamic water flow realizes synchronous washing of the precursor inside and outside, and the water consumption is significantly reduced. The wave pump is designed to reduce the loss of precursor, and the conveyor roller group is set to reduce the phenomena of precursor yarn tangling and adhesion. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the dry-process PAN-based carbon fiber precursor solvent wave-generating washing device described in this utility model;

[0018] Figure 2 This is a schematic diagram of the wave-generating pump in the solvent-generating wave washing device for dry PAN-based carbon fiber precursor described in this utility model.

[0019] In the diagram: 1. Primary washing tank; 2. Secondary washing tank; 3. Tertiary washing tank; 4. Hot roller; 5. Spray gun; 6. Conveyor roller assembly; 601. Upper roller; 602. Lower roller; 7. Wave-making pump; 701. Base; 702. Rotating shaft; 703. Wave-making assembly; 704. Protective net; 8. Primary three-way valve; 9. Sewage discharge pipeline; 10. Secondary three-way valve; 11. Secondary washing tank conveyor valve; 12. Primary washing tank conveyor valve; 13. Tertiary washing tank conveyor valve; 14. Conveyor pump; 15. Conveying channel. Detailed Implementation

[0020] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0021] like Figures 1-2 As shown, the dry-process PAN-based carbon fiber precursor solvent wave washing device includes a conveying pump 14, a primary washing tank 1, a secondary washing tank 2, and a tertiary washing tank 3. The conveying pump 14 is equipped with pipelines connected to the primary washing tank 1, the secondary washing tank 2, and the tertiary washing tank 3 for conveying washing water. Spray guns 5 and washing water inlets are provided on the side walls of the primary washing tank 1 and the secondary washing tank 2. The spray guns 5 are used to pre-wet the input precursor fibers. Wave-making pumps 7 are provided on the bottom walls of the primary washing tank 1, the secondary washing tank 2, and the tertiary washing tank 3. Hot rollers 4 are provided above the wave-making pumps 7 for conveying the precursor fibers during the washing process. A conveyor roller group 6 is provided at the precursor fiber output end above the primary washing tank 1 and the tertiary washing tank. The conveyor roller group 6 includes an upper roller 601 and a lower roller 602. The center points of the upper roller 601 and the lower roller 602 are located on the same vertical line. The conveyor roller group 6 is used to squeeze the precursor fibers.

[0022] Each of the primary washing tank 1, secondary washing tank 2, and tertiary washing tank 3 is equipped with a concentration detection device and a temperature detection device, and each is equipped with a sewage discharge pipe 9 at the bottom.

[0023] The pipeline connecting the delivery pump 14 to the primary washing tank 1 is equipped with a primary washing tank delivery valve 12 and a primary three-way valve 8. Two branch lines are provided after the primary three-way valve 8, which are respectively connected to the spray gun 5 on the primary washing tank 1 and the washing water inlet.

[0024] The pipeline connecting the delivery pump 14 and the secondary washing tank 2 is equipped with a secondary washing tank delivery valve 11 and a secondary three-way valve 10. Two branch lines are provided after the secondary three-way valve 10, which are respectively connected to the spray gun 5 on the secondary washing tank 2 and the washing water inlet.

[0025] A tertiary water washing tank conveying valve 13 is installed on the pipeline connecting the conveying pump 14 and the tertiary water washing tank 3. A pipeline for returning to the secondary water washing tank 2 is installed at the bottom of one side wall of the tertiary water washing tank 3.

[0026] The three-stage washing tank 3 has a conveying channel 15 on the side wall of the raw yarn input end for conveying raw yarn.

[0027] The primary washing tank 1 and the secondary washing tank 2 are located on the same horizontal plane, and the tertiary washing tank 3 is higher than the secondary washing tank 2.

[0028] The wave pump 7 consists of a base 701, a rotating shaft 702, and a wave-generating component 703 connected in sequence. The wave-generating component 703 has blades installed in its inner cavity for generating waves. The blades are connected to a power supply mechanism, and a shell is provided outside the blades and the power supply mechanism. A protective net 704 is connected to the periphery of the base 701, and the protective net 704 wraps around the wave pump 7 and its top.

[0029] The dry-process PAN-based carbon fiber precursor solvent wave washing device operates as follows: In the initial washing stage, washing water at different temperatures is delivered to the primary washing tank 1, secondary washing tank 2, and tertiary washing tank 3 via a conveyor pump 14. Under the action of the conveyor device, the precursor fiber enters the primary washing tank 1. The spray guns 5 on the side wall of the primary washing tank 1 are activated to pre-wet the precursor fiber. Under the action of the heated rollers 4, the precursor fiber undergoes solvent washing in the water. At this time, the wave-generating pump 7 is activated, and the washing water soaks and washes the pre-wetted precursor fiber. After washing in the primary washing tank 1, the fiber passes through the conveyor roller group 6, which consists of an upper roller 601 and a lower roller 602, to squeeze out some solution. The fiber then enters the secondary washing tank 2 for repeated washing. After washing in the secondary washing tank 2, the fiber does not require squeezing and is directly conveyed to the tertiary washing tank 3. The tertiary washing tank 3 is higher than... In the secondary washing tank 2, the raw yarn enters through the conveyor channel 15 on the side wall for final washing. After washing, it is squeezed by the conveyor roller group 6 and enters the subsequent device. During the raw yarn washing process, all three washing tanks are equipped with concentration detection devices. When the concentration exceeds the process concentration, the wave pump 7 is shut down in conjunction with the process. The sewage pipes 9 at the bottom of the primary washing tank 1 and the secondary washing tank 2 are connected to discharge the sewage. The primary three-way valve 8 is connected to the washing water inlet to transport the washing water. The washing water in the secondary washing tank 2 is supplied by the tertiary washing tank 3. The washing water in the tertiary washing tank 3 is transported by the conveyor pump 14 through the tertiary washing tank conveyor valve 13. At the same time, in order to ensure the solvent dissolution rate, all three washing tanks can be connected to steam pipes to heat the washing water. Temperature detection devices are also equipped to monitor the entire process. The valve opening can be adjusted according to the real-time water temperature in the tank to control the steam flow and thus achieve temperature regulation.

Claims

1. A dry-process PAN-based carbon fiber precursor solvent wave-generating washing device, characterized in that, The system includes a transfer pump (14), a primary washing tank (1), a secondary washing tank (2), and a tertiary washing tank (3). The transfer pump (14) is equipped with pipelines connected to the primary washing tank (1), the secondary washing tank (2), and the tertiary washing tank (3) for transporting washing water. The primary washing tank (1) and the secondary washing tank (2) are each equipped with a spray gun (5) and a washing water inlet on their side walls. The spray gun (5) is used to pre-wet the input raw yarn. The primary washing tank (1) and the secondary washing tank (3) are equipped with a primary washing tank (14), a primary washing tank (1), a secondary washing tank (2), and a tertiary washing tank (3). (2) and the bottom wall of the three-stage washing tank (3) are equipped with wave-making pumps (7), and hot rollers (4) are installed above the wave-making pumps (7) for conveying the raw yarn during the washing process; a conveyor roller group (6) is installed at the raw yarn output end above the first-stage washing tank (1) and the three-stage washing tank (3). The conveyor roller group (6) includes an upper roller (601) and a lower roller (602). The center points of the upper roller (601) and the lower roller (602) are located on the same vertical line. The conveyor roller group (6) is used to squeeze the raw yarn.

2. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, The primary washing tank (1), secondary washing tank (2), and tertiary washing tank (3) are all equipped with concentration detection devices and temperature detection devices, and each has a sewage discharge pipe (9) at the bottom.

3. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, The pipeline connecting the delivery pump (14) and the primary washing tank (1) is equipped with a primary washing tank delivery valve (12) and a primary three-way valve (8). Two branch lines are provided after the primary three-way valve (8), which are respectively connected to the spray gun (5) on the primary washing tank (1) and the washing water inlet.

4. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, The pipeline connecting the delivery pump (14) and the secondary washing tank (2) is equipped with a secondary washing tank delivery valve (11) and a secondary three-way valve (10). Two branch lines are provided after the secondary three-way valve (10), which are respectively connected to the spray gun (5) on the secondary washing tank (2) and the washing water inlet.

5. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, A three-stage water washing tank conveying valve (13) is installed on the pipeline connecting the conveying pump (14) and the three-stage water washing tank (3). A pipeline for returning to the two-stage water washing tank (2) is installed at the bottom of one side wall of the three-stage water washing tank (3).

6. The dry-process PAN-based carbon fiber precursor solvent wave-generating washing device according to claim 1, characterized in that, The three-stage washing tank (3) has a conveying channel (15) on the side wall of the raw silk input end for conveying raw silk.

7. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, The primary washing tank (1) and the secondary washing tank (2) are located on the same horizontal plane, and the tertiary washing tank (3) is higher than the secondary washing tank (2).

8. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 1, characterized in that, The wave pump (7) consists of a base (701), a rotating shaft (702) and a wave-making assembly (703) connected in sequence. The wave-making assembly (703) has blades installed in its inner cavity for creating waves. The blades are connected to the power supply mechanism, and the blades and the power supply mechanism are covered by a housing.

9. The dry-process PAN-based carbon fiber precursor solvent wave washing device according to claim 8, characterized in that, The base (701) is surrounded by a protective net (704), which wraps around and tops the wave pump (7).

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