Industrial grade alumina continuous fiber thousand-hole spinning tunnel and bundling device

Abstract

The present invention discloses an industrial-grade alumina continuous fiber thousand-hole spinning tunnel and a bundling device, and belongs to the technical field of alumina spinning equipment. In the thousand-hole spinning tunnel and the bundling device described in the present invention, one end of the liquid suction device is connected to the liquid supply device, and the other end is connected to the spinneret assembly; the spinneret assembly and the upper annular blowing device are located at the upper part of the tunnel body, and the upper annular blowing device is located on the outer side of the spinneret assembly; the side annular blowing device and the annular heating device are located on both sides of the tunnel body, and the side annular blowing device is located at the upper part of the annular heating device; the central axis of the oiling device and the central axis of the crossbar are on the same straight line; the twisting device is located at the lower part of the oiling device, the air supply device is located at the lower part of the twisting device, and the drafting device is located at the lower part of the air supply device. The device of the present invention can control the average fiber diameter to reach the level of 9μm±1.5μm, solving the problem of floating and broken fibers that has been unsolvable in the spinning process.

Description

Technical Field

[0001] The invention relates to an industrial-grade alumina continuous fiber thousand-hole spinning corridor and a bundling device, belonging to the technical field of alumina spinning equipment. Background Art

[0002] Alumina fiber is a new type of high-performance inorganic fiber, and its main component is Al2O3. Alumina fiber belongs to high-performance ceramic fiber, which has high strength, high modulus, high temperature resistance and good oxidation resistance. It can maintain good chemical stability in oxidizing or reducing atmosphere. It also has the advantages of low thermal conductivity, low thermal expansion coefficient and good thermal shock resistance. At present, the preparation process of alumina fiber mainly adopts sol-gel method. Normal spinning generally adopts top annular blowing, and the humidity of the tunnel is controlled by adjusting the dry and wet air flow rate and suction flow rate of the tunnel intake to keep it in the silk-out state, and the humidity test point is close to the tunnel wall. However, when there are many spinneret holes (4 to 6 circles), it is difficult to adjust the humidity to a state where there is no dripping and no break in the inner and outer circles. The main manifestation is rolling (too high humidity will cause dripping, and too low humidity will break the fiber, and there will be dripping after breaking). The fibers in the outermost circle may even break (too dry), while the inner circle may still drip from time to time (too wet). This results in the ineffective evaporation of the solvent and cannot meet the needs of multi-head and large-scale production.

[0003] In view of the characteristics of industrial-grade alumina spinning, the spinning shaft is a key factor affecting the formation and quality of fiber precursors. Among them, temperature, humidity and airflow control are the core technologies for the stable production of high-performance fiber precursors, which are the difficult problems that most domestic companies need to solve for continuous spinning of alumina fibers. Summary of the invention

[0004] In order to solve at least one of the above problems, the present invention prepares a special spinning channel for alumina fibers according to the heat and mass transfer process and the matching of the solvent volatilization rate and the stretching rate, so that the average fiber diameter is controlled to reach 9μm±1.5μm, solving the problem of floating and broken fibers that has not been solved in the spinning process.

[0005] The first object of the present invention is to provide an industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device, the device comprising a liquid feeding device, a liquid suction device, a spinneret assembly, a tunnel body, an upper annular blowing device, a side annular blowing device, an annular heating device, an oiling device, a cross bar, a twisting device, an air supply device, and a drafting device; wherein one end of the liquid suction device is connected to the liquid feeding device, and the other end is connected to the spinneret assembly; the spinneret assembly and the upper annular blowing device are located at the upper part of the tunnel body, and the upper annular blowing device is located on the outside of the spinneret assembly; the side annular blowing device and the annular heating device are located on both sides of the tunnel body. side, and the side annular blowing device is located at the upper part of the annular heating device; the central axes of the spinneret assembly, the upper annular blowing device, the side annular blowing device, the annular heating device and the tunnel body are in the same straight line; the central axis of the oiling device and the central axis of the cross bar are in the same straight line and are located at the lower part of the tunnel body, perpendicular to the center line of the tunnel body; the twisting device is located at the lower part of the oiling device, the air supply device is located at the lower part of the twisting device, and the drawing device is located at the lower part of the air supply device, and the drawing jaws of the drawing device, the central axis of the air supply device, the central axis of the twisting device, the central axis of the tunnel body and the midpoint of the cross bar are in the same straight line.

[0006] In one embodiment of the present invention, the industrial-grade alumina continuous fiber thousand-hole spinning channel and bundling device also includes a pressure monitor and a liquid flow rate detector. The pressure monitor and the liquid flow rate detector are located on the liquid suction device and between the liquid supply device and the spinneret assembly. The function is to ensure that the liquid supply device supplies liquid evenly.

[0007] In one embodiment of the present invention, the air supply device comprises an air inlet and a fixed bracket, and the air inlet and the fixed bracket are located in the middle of both sides of the air supply device; the wind speed of the air supply device is 0.1-0.3 m / s.

[0008] In one embodiment of the present invention, the spinneret assembly is a cylindrical tubular spinneret, the middle part of which is hollow, and the cross-section of the cylindrical tube is uniformly distributed through holes (thousands of holes); the function of the through holes is to spin the spinning liquid, and the function of the hollow middle is to pass hot air; the diameter of the middle part is 1 / 5 to 3 / 5 of the diameter of the spinneret assembly.

[0009] In one embodiment of the present invention, the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device also includes a humidity detection point; the humidity detection point is located between the upper part of the tunnel body and the side annular blowing device; its function is to detect the humidity inside the tunnel body.

[0010] In one embodiment of the present invention, the liquid feeding device is a container for holding aluminum oxide spinning solution; the liquid suction device is a liquid suction tube; and the drafting device is a drafting roller.

[0011] In one embodiment of the present invention, the oiling device is fluoroether oil oiling.

[0012] In one embodiment of the present invention, the twisting device is in the shape of a disc, and its function is to use the rotor on the disc to twist the ejected fiber bundles and bundle the fibers into fiber bundles.

[0013] In one embodiment of the present invention, the length of the corridor is 8 to 10 m.

[0014] In one embodiment of the present invention, the humidity of the tunnel body is controlled at 70% to 75%.

[0015] In one embodiment of the present invention, the flow rate of the liquid aspiration device (the flow rate of the spinning solution) is 18 to 22 L / min.

[0016] In one embodiment of the present invention, the wind speed of the upper annular blowing device is 0.3-0.7 m / s, the wind force is level 1, and the height is 40-60 mm.

[0017] In one embodiment of the present invention, the wind speed of the side annular blowing device is 0.3-0.5 m / s, the wind force is level 1, and the height is 50-70 mm.

[0018] In one embodiment of the present invention, the flow rate of the hot air in the center of the spinneret assembly is 0.7-1.0 m / s.

[0019] In one embodiment of the present invention, the annular heating device is used to ensure that the temperature of the tunnel body is 25-30°C.

[0020] The second object of the present invention is to provide a method for spinning alumina fibers, wherein the method adopts the industrial-grade alumina continuous fiber thousand-hole spinning channel and bundling device described in the present invention.

[0021] The working principle of the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device described in the present invention is:

[0022] The liquid suction device sucks the alumina spinning liquid in the liquid feeding device into the spinneret assembly, and controls the speed of the spinning liquid flowing into the spinneret assembly through the pressure monitoring meter and the liquid flow rate detector; then the spinning liquid is drawn out of the fiber through the spinneret assembly, and the fiber enters the channel body, and the upper annular blowing device, the side annular blowing device, and the annular heating device blow and heat the channel body, and hot gas flows out from the center of the spinneret assembly, so that the humidity in the channel body detected by the humidity detection point is controlled at 70% to 75%, and the temperature is controlled at 25°C to 30°C; in such an environment, the dispersed fibers are drawn out of the channel body along a specific path, and then oiled in the oiling device to solve the problem of fiber sticking; then the fibers are introduced into the twisting device to twist into fiber bundles to increase the cohesion between the fibers; then the fibers are blown and stretched in the air supply device and the drawing device, and air is taken in at the air inlet at the same time, so that the air flow acts evenly on the filament bundles, reducing the mutual entanglement between the filament bundles, and at the same time improving the production efficiency, so as to achieve the production of industrialized alumina fibers.

[0023] Beneficial effects of the present invention:

[0024] (1) The present invention improves the spinneret assembly by drilling holes on the middle edge of the hollow space and injecting hot air into the middle to solve the problem of wet inside and dry outside in the fiber spinning process.

[0025] (2) The present invention designs the spinning tunnel so that the tunnel is lengthened to 8 to 10 meters, thereby increasing the humidity range of the spinnable fibers, enabling faster adjustment to a good spinning state and reducing the dripping phenomenon. A humidity detection point is set in the tunnel body so that the humidity in the tunnel body is controlled at 70% to 75%, and the temperature is controlled at 25°C to 30°C, thereby increasing the fiber fineness, reducing the breakage phenomenon caused by the influence of humidity, and ensuring the uniformity of the fibers.

[0026] (3) The airflow distribution in the tunnel body of the present invention adopts a cyclic operation of upper annular blowing, central suction of the spinneret assembly and accompanied by side annular heating, so that a large amount of solvent can be effectively volatilized and precipitated by the airflow in time, maintaining the temperature and humidity balance in the tunnel, reducing the impact of blowing and suction on the fibers, and making the airflow act evenly on the filament bundles, reducing the mutual entanglement between the filament bundles, and at the same time improving the production efficiency, thereby achieving the production of industrialized alumina fibers.

[0027] (4) The fibers are first oiled with fluoroether oil outside the tube body. Generally, the fibers are first bundled and then oiled. The present invention adopts the oiling operation first, which can solve the problem of fiber sticking and reduce the phenomenon of fiber breakage or fiber unevenness. After the oiling operation, the fibers are twisted and bundled. Different from the previous method of first stretching and then twisting, the purpose of this operation is to increase the adhesion between the fibers and provide support for the subsequent sintering and de-loosening. Then, the fiber bundle is stretched, and the method of bundle stretching is changed. The air supply device is used directly for stretching, which reduces the difficulty of spinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device of the present invention;

[0029] Figure 2 This is the front view of the industrial-grade alumina continuous fiber thousand-hole spinning tunnel;

[0030] Figure 3 is a top view of a spinneret assembly;

[0031] Among them, there are a liquid feeding device 1, a liquid suction device 2, a pressure monitoring meter 3, a liquid flow rate detector 4, a spinneret assembly 5, an upper annular blowing device 6, a humidity detection point 7, a channel body 8, a side annular blowing device 9, an annular heating device 10, an oiling device 11, a cross bar 12, a twisting device 13, an air supply device 14, an air inlet 15, a fixed bracket 16, and a stretching device 17. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explaining the present invention and are not used to limit the present invention.

[0033] Example 1

[0034] An industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device, the device comprises a liquid feeding device 1, a liquid suction device 2, a spinneret assembly 5, a tunnel body 8, an upper annular blowing device 6, a side annular blowing device 9, an annular heating device 10, an oiling device 11, a cross bar 12, a twisting device 13, an air supply device 14, and a drafting device 17; wherein one end of the liquid suction device 2 is connected to the liquid feeding device 1, and the other end is connected to the spinneret assembly 5; the spinneret assembly 5 and the upper annular blowing device 6 are located at the upper part of the tunnel body 8, and the upper annular blowing device 6 is located on the outer side of the spinneret assembly 5; the side annular blowing device 9 and the annular heating device 10 are located on both sides of the tunnel body 8, and the side annular blowing device 14 ... Device 9 is located at the upper part of the annular heating device 10; the central axes of the spinneret assembly 5, the upper annular blowing device 6, the side annular blowing device 9, the annular heating device 10 and the tunnel body 8 are on the same straight line; the central axis of the oiling device 11 and the central axis of the cross bar 12 are on the same straight line and are located at the lower part of the tunnel body 8, perpendicular to the center line of the tunnel body 8; the twisting device 13 is located at the lower part of the oiling device 11, the air supply device 14 is located at the lower part of the twisting device 13, and the drawing device 17 is located at the lower part of the air supply device 14, and the drawing jaws of the drawing device 17, the central axis of the air supply device 14, the central axis of the twisting device 13, the central axis of the tunnel body 8, and the midpoint of the cross bar 12 are on the same straight line.

[0035] Furthermore, the industrial-grade alumina continuous fiber thousand-hole spinning channel and bundling device also includes a pressure monitor 3 and a liquid flow rate detector 4. The pressure monitor 3 and the liquid flow rate detector 4 are located on the liquid suction device 2 and are located between the liquid feeding device 1 and the spinneret assembly 5. Their function is to ensure that the liquid feeding device feeds liquid evenly.

[0036] Furthermore, the air supply device 14 includes an air inlet 15 and a fixing bracket 16, and the air inlet 15 and the fixing bracket 16 are located in the middle of both sides of the air supply device 14; the wind speed of the air supply device 14 is 0.1-0.3 m / s.

[0037] Furthermore, the spinneret assembly 5 is a cylindrical tubular spinneret, the middle part of which is hollow, and the cross-section of the cylindrical tube is uniformly distributed through holes (thousands of holes); the function of the through holes is to spin the spinning liquid, and the function of the hollow middle is to pass the hot air; the diameter of the middle part is 1 / 5 to 3 / 5 of the diameter of the spinneret assembly.

[0038] Furthermore, the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device also includes a humidity detection point 7; the humidity detection point 7 is located between the upper part of the tunnel body 8 and the side annular blowing device 9; the function is to detect the humidity in the tunnel body.

[0039] Furthermore, the liquid feeding device 1 is a container for holding spinning liquid; the liquid suction device 2 is a liquid suction tube; and the drafting device 17 is a drafting roller.

[0040] Furthermore, the oiling device 11 is a fluoroether oil oiling device.

[0041] Furthermore, the twisting device 13 is in the shape of a disk, and its function is to use the rotor on the disk to twist the ejected fiber bundles and bundle the fibers into fiber bundles.

[0042] Furthermore, the length of the tunnel body 8 is 8 to 10 m.

[0043] Furthermore, the humidity of the tunnel body 8 is controlled at 70% to 75%.

[0044] Furthermore, the annular heating device is used to ensure that the temperature of the tunnel body is between 25 and 30°C.

[0045] Furthermore, the flow rate of the liquid aspiration device 2 (the flow rate of the spinning solution) is 18 to 22 L / min.

[0046] Furthermore, the wind speed of the upper annular blowing device 6 is 0.3-0.7 m / s, the wind force is level 1, and the height is 40-60 mm.

[0047] Furthermore, the wind speed of the side annular blowing device 9 is 0.3-0.5 m / s, the wind force is level 1, and the height is 50-70 mm.

[0048] Furthermore, the flow rate of the hot air in the center of the spinneret assembly 5 is 0.7-1.0 m / s.

[0049] The working principle of the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device is as follows:

[0050] The liquid suction device 2 sucks the aluminum oxide spinning solution in the liquid feeding device 1 into the spinneret assembly 5, and controls the speed of the spinning solution flowing into the spinneret assembly 5 through the pressure monitoring meter 3 and the liquid flow rate detector 4; then the spinning solution passes through the spinneret assembly 5 to lead out the fiber, and the fiber enters the channel body 8, and the upper side annular blowing device 6, the side annular blowing device 9, and the annular heating device 10 blow and heat the channel body 8, and the hot gas flows out from the center of the spinneret assembly 5, so that the humidity in the channel body 8 detected by the humidity detection point 7 is controlled at 70% to 75%. %, and the temperature is controlled at 25℃~30℃; in such an environment, the dispersed fibers are led out of the channel body 8 along a specific path, and then oiled in the oiling device 11 to solve the problem of fiber sticking; then the fibers are introduced into the twisting device 13 and twisted into fiber bundles to increase the adhesion between the fibers; then the fibers are blown and stretched in the air supply device 14 and the stretching device 17, and at the same time, air is taken in through the air inlet 15, so that the air flow acts evenly on the filament bundles, reducing the mutual entanglement between the filament bundles and improving the production efficiency, thereby achieving the production of industrialized alumina fibers.

[0051] Example 2

[0052] A spinning method for alumina fibers, wherein the method adopts the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device described in Example 1.

[0053] Among them, the length of the corridor body 8 is 8m; the humidity of the corridor body 8 is controlled at 75% and the temperature is 25°C; the flow rate of the liquid absorption device 2 (the flow rate of the spinning liquid) is 20L / min; the wind speed of the upper annular blowing device 6 is 0.4m / s, the wind force is level 1; the height is 50mm; the wind speed of the side annular blowing device 9 is 0.4m / s, the wind force is level 1; the height is 60mm; the flow rate of the hot air in the center of the spinneret assembly 5 is 0.8m / s.

[0054] The obtained fiber is then sintered, and the sintering process is to sinter the fiber in stages under air atmosphere. The first stage is low-speed low-temperature sintering: slowly heat the fiber to 700℃ at a low heating rate (10℃ / min) and keep it warm for 30 minutes; then the second stage is fast high-temperature sintering: heat the fiber from 700℃ to a specified temperature of 1100℃ at a higher heating rate (60 / min), take it out after keeping it warm for a period of time, and air cool it to obtain alumina fiber with a certain microstructure.

[0055] The obtained fiber was tested for performance, and the average value of 30 groups was taken. The test results were: the fiber fineness was 0.9dtex, and the fiber diameter was 5.26μm. At the same time, the XQ-1C high-strength and high-modulus fiber strength and elongation tester was used to measure the strength and elongation of the fiber (according to the national standard "GB / T 14344-2008 Chemical Fiber Filament Tensile Performance Test Method", the clamping distance was 500mm, the stretching speed was 500mm / min, and the pre-tension was 0.05cN / dtex). The test results showed that the breaking strength was 2.89GPa.

[0056] Comparative Example 1

[0057] The spinneret assembly 5 is adjusted to be solid in the middle and the rest is kept consistent with Example 2 to obtain alumina fibers.

[0058] The test results show that the fibers are sticky and breakage is serious during the spinning process.

[0059] Comparative Example 2

[0060] The length of the spinning tunnel body 8 was adjusted to 5 m, and the other parameters were kept consistent with those in Example 2 to obtain alumina fibers.

[0061] The test results show that during the spinning process, the fibers adhered and dripping occurred, resulting in poor fiber quality.

[0062] Comparative Example 3

[0063] The order of twisting and oiling was adjusted to twist first and then oiling, and the rest was kept consistent with Example 2 to obtain alumina fibers.

[0064] The test results show that the fibers are sticky and breakage is serious during the spinning process.

[0065] Comparative Example 4

[0066] The order of drawing and twisting was adjusted, drawing first and then twisting, and the rest was kept consistent with Example 2 to obtain alumina fibers.

[0067] The test results show that the fibers are easy to fall apart during the subsequent sintering process, resulting in poor adhesion between the fibers.

[0068] Comparative Example 5

[0069] The flow rate of the spinning solution was adjusted to 30 L / min, and the other conditions were kept consistent with Example 2 to obtain alumina fibers.

[0070] The test results showed that the fibers were severely adhered during the spinning process.

[0071] Comparative Example 6

[0072] The flow rate of the spinning solution was adjusted to 10 L / min, and the other conditions were kept consistent with Example 2 to obtain alumina fibers.

[0073] The test results showed that the fibers broke seriously during the spinning process.

[0074] Comparative Example 7

[0075] The wind speed of the upper annular blowing device 6 was adjusted to 2 m / s or 0.1 m / s, and the rest was kept consistent with Example 2 to obtain alumina fibers.

[0076] The test results found that the fibers could not be spun along the path during the spinning process, resulting in severe adhesion between the fibers.

[0077] Comparative Example 8

[0078] The wind speed of the side annular blowing device 9 was adjusted to 2 m / s or 0.1 m / s, and the other parameters were kept consistent with those in Example 2 to obtain alumina fibers.

[0079] The test results found that the fibers could not be spun along the path during the spinning process, resulting in severe adhesion between the fibers.

[0080] Comparative Example 9

[0081] The diameter of the middle part of the spinning assembly 5 is adjusted to only 1 / 6 of the spinning assembly, and the rest is consistent with Example 2 to obtain alumina fibers.

[0082] The test results found that the hot air could not be discharged in time, resulting in excessive hot air in the channel and serious adhesion between fibers.

[0083] Although the present invention has been disclosed as above in the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the technology and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. An industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device, characterized in that: The device comprises a liquid supply device (1), a liquid absorption device (2), a spinneret assembly (5), a channel body (8), an upper annular blowing device (6), a side annular blowing device (9), an annular heating device (10), an oiling device (11), a cross bar (12), a twisting device (13), an air supply device (14), and a drafting device (17); wherein one end of the liquid absorption device (2) is connected to the liquid supply device (1), and the other end is connected to the spinneret assembly (5); the spinneret assembly (5) and the upper annular blowing device (6) are located at the upper part of the channel body (8), and the upper annular blowing device (6) is located on the outer side of the spinneret assembly (5); the side annular blowing device (9) and the annular heating device (10) are located on both sides of the channel body (8), and the side annular blowing device (9) is located on the annular heating device (10). The spinneret assembly (5), the upper annular blowing device (6), the side annular blowing device (9), the annular heating device (10) and the central axis of the tunnel body (8) are on the same straight line; the central axis of the oiling device (11) and the central axis of the cross bar (12) are on the same straight line and are located at the lower part of the tunnel body (8) and are perpendicular to the central line of the tunnel body (8); the twisting device (13) is located at the lower part of the oiling device (11), the air supply device (14) is located at the lower part of the twisting device (13), the drafting device (17) is located at the lower part of the air supply device (14), and the drafting jaws of the drafting device (17), the central axis of the air supply device (14), the central axis of the twisting device (13), the central axis of the tunnel body (8) and the midpoint of the cross bar (12) are on the same straight line; The spinneret assembly (5) is a cylindrical tube-shaped spinneret, the middle part of which is hollow, and the cross section of the cylindrical tube is a uniformly distributed through hole; the diameter of the middle part is 1 / 5 to 3 / 5 of the diameter of the spinneret assembly (5); The length of the tunnel body (8) is 8 to 10 m; the humidity of the tunnel body (8) is controlled at 70% to 75%; the temperature is 25 to 30° C.; The flow rate of the spinning solution in the liquid absorption device (2) is 18 to 22 L / min; The wind speed of the upper annular blowing device (6) is 0.3-0.7 m / s, the wind force is level 1, and the height is 40-60 mm; the wind speed of the side annular blowing device (9) is 0.3-0.5 m / s, the wind force is level 1, and the height is 50-70 mm; The industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device also includes a pressure monitor (3) and a liquid flow rate detector (4). The pressure monitor (3) and the liquid flow rate detector (4) are located on the liquid suction device (2) and between the liquid feeding device (1) and the spinneret assembly (5). The air supply device (14) comprises an air inlet (15) and a fixed bracket (16), wherein the air inlet (15) and the fixed bracket (16) are located in the middle of both sides of the air supply device (14); the wind speed of the air supply device (14) is 0.1-0.3 m / s.

2. The device according to claim 1, characterized in that The industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device also includes a humidity detection point (7); the humidity detection point (7) is located between the upper part of the tunnel body (8) and the side annular blowing device (9).

3. The device according to claim 1 or 2, characterized in that: The flow rate of the hot air in the center of the spinneret assembly (5) is 0.7-1.0 m / s.

4. A method for spinning alumina fibers, wherein the method comprises using the industrial-grade alumina continuous fiber thousand-hole spinning tunnel and bundling device as described in any one of claims 1 to 3.

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