CN218932509U - Multi-row blowing device for assisting formation of alumina continuous fiber blanket - Google Patents
Multi-row blowing device for assisting formation of alumina continuous fiber blanket Download PDFInfo
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- CN218932509U CN218932509U CN202223360294.8U CN202223360294U CN218932509U CN 218932509 U CN218932509 U CN 218932509U CN 202223360294 U CN202223360294 U CN 202223360294U CN 218932509 U CN218932509 U CN 218932509U
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Abstract
The utility model discloses an auxiliary alumina continuous fiber blanket forming multi-row blowing device, and belongs to the technical field of textile accessories. The device includes storage tank, multirow jetting mechanism and hollow section of thick bamboo, the storage tank pass through the pipeline with multirow jetting mechanism intercommunication, multirow jetting mechanism's below be provided with hollow section of thick bamboo and with hollow section of thick bamboo intercommunication, hollow section of thick bamboo's below intercommunication has negative pressure suction fan, multirow jetting mechanism's upper and lower surface is provided with first layer spinneret orifice and second floor spinneret orifice respectively. The utility model can ensure that the alumina fiber blanket can not be broken into powder alumina fibers due to shearing of the alumina fibers in the process of processing and forming so as to reduce the strength of the alumina continuous fiber blanket; the utility model can ensure that the alumina fiber is not damaged in the preparation process, the existence of powdery alumina fiber is stopped, and the forming strength and quality of the alumina continuous fiber blanket are ensured.
Description
Technical Field
The utility model relates to an auxiliary alumina continuous fiber blanket forming multi-row blowing device, and belongs to the technical field of textile accessories.
Background
In recent years, with the increasing demands of the fields of military industry, aerospace and civil use for high-temperature resistant heat insulation materials and reinforcing materials, the alumina fiber serving as a novel high-performance inorganic nonmetallic fiber material has the ultra-conventional high-temperature resistant oxidation performance and the equivalent mechanical performance, so that the alumina fiber becomes the focus of research in the field.
The alumina fiber can be prepared from metal oxide powder, polymer, inorganic salt of aluminum and the like by a melting method, electrostatic spinning, an impregnation method, a sol-gel method and the like, wherein the sol-gel method is most common, and the precursor gel alumina fiber with uniform components, higher purity and uniform performance can be obtained. After a suitable heat treatment, the final polycrystalline alumina continuous fibers are obtained.
Alumina continuous fiber blanket, as a refractory separator material currently under development in all countries, faces many difficulties in the manufacturing process. If the traditional short felt forming mode is adopted, the alumina fiber is easy to be influenced by transverse shearing acting force, and the break points are formed into powdery short fibers, so that the forming strength of the alumina continuous fiber blanket is influenced, the overall mechanical property is reduced, and the final practical application is influenced.
Therefore, how to design a device for assisting in forming an alumina continuous fiber blanket is a technical problem to be solved.
Disclosure of Invention
[ technical problem ]
If the traditional short felt forming mode is adopted, the alumina fiber is easy to be influenced by transverse shearing acting force, and the break points are formed into powdery short fibers, so that the forming strength of the alumina continuous fiber blanket is influenced, the overall mechanical property is reduced, and the final practical application is influenced.
Technical scheme
In order to solve the problems, the utility model provides an auxiliary alumina continuous fiber blanket forming multi-row blowing device, which can ensure that the strength of the alumina continuous fiber blanket is reduced because the alumina fiber blanket is formed into powdery alumina fibers by shearing damage to the alumina fibers in the process of processing and forming. Compared with other alumina continuous fiber blanket forming methods or devices, the device can ensure that alumina fibers are not damaged and destroyed in the preparation process, prevent powdery alumina fibers from being existed, ensure the forming strength and quality of the alumina continuous fiber blanket, and simplify the preparation flow of the alumina continuous fiber blanket and improve the preparation efficiency.
The utility model provides an auxiliary aluminum oxide continuous fiber blanket forming multi-row blowing device which comprises a storage tank, a multi-row blowing mechanism and a hollow cylinder, wherein the storage tank is communicated with the multi-row blowing mechanism through a pipeline, the hollow cylinder is arranged below the multi-row blowing mechanism and is communicated with the hollow cylinder, a negative pressure suction fan is communicated below the hollow cylinder, a negative pressure suction net and a conveying belt are further arranged between the hollow cylinder and the negative pressure suction fan, the negative pressure suction net is positioned above the conveying belt, and the conveying belt drives the negative pressure suction net to move; the upper surface and the lower surface of the multi-row blowing mechanism are respectively provided with a first layer of spinning holes and a second layer of spinning holes, and a plurality of first layer of spinning holes and a plurality of second layer of spinning holes are in one-to-one correspondence.
In one embodiment of the present utility model, the inside of the multi-row blowing mechanism is hollow, and the size of the first layer of spinning holes is the same as that of the second layer of spinning holes.
In one embodiment of the present utility model, a plurality of vent holes are provided on the side surface of the multi-row blowing mechanism.
In one embodiment of the utility model, the radius of the first layer of spinning holes and the second layer of spinning holes of the multi-row blowing mechanism is 0.3-0.6mm, and the distance between the spinning holes is 2-15mm.
In one embodiment of the utility model, the ratio of the radius of the orifices to the spacing of the first and second layers of orifices is 1:10-1:80.
in one embodiment of the utility model, the pipeline is provided with a safety valve and a metering pump.
In one embodiment of the present utility model, the safety valve is a solenoid valve or an electrically operated valve.
In one embodiment of the utility model, the storage tank is connected with a screw extruder, and the screw extruder is used for conveying materials in the storage tank to the multi-row blowing mechanism through the pipeline.
In one embodiment of the utility model, the conveyor belt and the negative pressure suction net are provided with meshes, and the negative pressure suction fan is positioned in the conveyor belt.
In one embodiment of the present utility model, the material of the multi-row blowing mechanism is stainless steel, ceramic or silicon carbide.
Advantageous effects
(1) The multi-row blowing device for forming the auxiliary alumina continuous fiber blanket can ensure that the powdery alumina fibers formed by shearing damage to the alumina fibers in the process of processing and forming can not be damaged when the alumina fiber blanket is formed, so that the strength of the alumina continuous fiber blanket is reduced. Compared with other alumina continuous fiber blanket forming methods or devices, the method can ensure that alumina fibers are not damaged and destroyed in the preparation process, prevent powdery alumina fibers from being existed, and ensure the forming strength and quality of the alumina continuous fiber blanket.
(2) The device can simplify the preparation flow of the alumina continuous fiber blanket and improve the preparation efficiency.
(3) When the negative pressure suction fan works, air cools and shapes filiform spinning solution through side vent holes of the multi-row blowing mechanism, and in addition, the negative pressure suction fan can blow off alumina precursor fibers which have passed through the second layer of spinning holes to form alumina short fibers.
(4) The pipeline is provided with the safety valve and the metering pump, and the safety valve and the metering pump can observe and regulate the capacity and the flow rate of materials in the pipeline at any time.
(5) The multi-row blowing mechanism is hollow, and the multi-row blowing mechanism comprises the uniformly distributed spinneret orifices, so that the alumina precursor fibers can be ensured to be uniformly cooled, and short fibers are formed by blowing down by the negative pressure suction fan, so that the damage of the alumina precursor fibers in the preparation process is avoided.
(6) The radius, arrangement distance and interval between two layers of spinneret holes of the multi-row spinneret mechanism can be adjusted according to the actual requirements of the alumina continuous fiber blanket. Thereby obtaining the proper radius, length of the alumina fiber and the thickness and strength of the final alumina continuous fiber blanket.
(7) According to the utility model, the conveyor belt and the negative pressure suction net are respectively provided with mesh openings, and the falling precursor oxidized fibers can be adsorbed into a net by the negative pressure suction net through the negative pressure suction machine, so that the conveyor belt drives the negative pressure suction net to move forwards, and a precursor alumina continuous fiber blanket with the thickness of 1-100mm can be formed.
Drawings
FIG. 1 is a schematic diagram of a multi-row blowing device for assisting in forming an alumina continuous fiber blanket according to the present utility model;
FIG. 2 is a top view of a multiple row blowing mechanism of the present utility model, where R is the orifice radius, tx is the orifice lateral spacing, and Ty is the orifice longitudinal spacing;
fig. 3 is a side view of the multiple row blowing mechanism of the present utility model, where R is the vent radius, tx is the vent lateral spacing, ty is the vent longitudinal spacing, the spacing of the first layer of orifices and the second layer of orifices is Y, and the ratio of the orifice radius R to the spacing Y (R/Y) is referred to as the aperture ratio.
Wherein: 1. a storage tank; 2. a safety valve; 3. a metering pump; 4. a multi-row blowing mechanism; 5. negative pressure air suction net; 6. a negative pressure suction fan; 7. creating and feeding a belt; 8. a hollow cylinder; 9. a first layer of orifices; 10. a second layer of orifices; 11. and (3) a vent hole.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Example 1
As shown in fig. 1-3, the embodiment provides an auxiliary multi-row blowing device for forming an alumina continuous fiber blanket, which comprises a storage tank 1, a multi-row blowing mechanism 4 and a hollow cylinder 8, wherein the storage tank 1 is communicated with the multi-row blowing mechanism 4 through a pipeline, the hollow cylinder 8 is arranged below the multi-row blowing mechanism 4 and is communicated with the hollow cylinder 8, a negative pressure suction fan 6 is communicated below the hollow cylinder 8, a negative pressure suction net 5 and a conveying belt 7 are further arranged between the hollow cylinder 8 and the negative pressure suction fan 6, the negative pressure suction net 5 is positioned above the conveying belt 7, and the conveying belt 7 drives the negative pressure suction net 5 to move; the upper surface and the lower surface of the multi-row blowing mechanism 4 are respectively provided with a first layer of spinning holes 9 and a second layer of spinning holes 10, and a plurality of first layer of spinning holes 9 are in one-to-one correspondence with a plurality of second layer of spinning holes 10.
Optionally, the inside of the multi-row blowing mechanism 4 is hollow, the upper surface and the lower surface of the multi-row blowing mechanism 4 are respectively provided with a first layer of spinning holes 9 and a second layer of spinning holes 10, and the sizes of the first layer of spinning holes 9 and the second layer of spinning holes 10 are the same, i.e. the upper surface and the lower surface of the multi-row blowing mechanism 4 are provided with the spinning holes which are completely consistent.
Optionally, a plurality of ventilation holes 11 are arranged on the side surface of the multi-row blowing mechanism 4, and the ventilation holes 11 are used for cooling the alumina precursor fibers between the first layer of spinning holes 9 and the second layer of spinning holes 10.
Optionally, the multiple rows of blowing mechanisms 4 are integrally formed from stainless steel, ceramic or silicon carbide materials.
Optionally, the radius of the first layer of spinneret holes 9 and the second layer of spinneret holes 10 of the multi-row spinneret mechanism 4 is 0.3-0.6mm, and the distance between the spinneret holes is 2-15mm.
Optionally, the number of the spinneret holes of the multi-row blowing mechanism 4 is 2*5-20×100.
As shown in fig. 2 and 3, R is the orifice radius, tx is the orifice lateral spacing, ty is the orifice longitudinal spacing; r is the vent radius, tx is the vent lateral spacing, ty is the vent longitudinal spacing, the spacing of the first layer of orifices and the second layer of orifices is Y, and the ratio of the orifice radius R to the spacing Y (R/Y) is referred to as the aperture ratio. The ratio of the radius of the orifices to the spacing of the first layer of orifices 9 and the second layer of orifices 10 is referred to as the aperture ratio, which is 1:10-1:80.
further, the working frequency of the negative pressure suction fan 6 is 0.5-2Hz, the rotating speed of the negative pressure suction fan is 200-300r/min, further, the rotating speed of the negative pressure suction fan 6 is preferably 250r/min, when the negative pressure suction fan 6 works, air cools and shapes filiform spinning solution through side vent holes 11 of the multi-row blowing mechanism 4, and in addition, the negative pressure suction fan 6 blows off alumina precursor fibers which have passed through the second layer of spinneret holes 10 to form alumina short fibers.
Optionally, the pipeline is provided with a safety valve 2 and a metering pump 3, and the safety valve 2 and the metering pump 3 can observe and regulate the capacity and the flow rate of materials in the pipeline at any time. Optionally, the rotating speed of the metering pump 3 is 0.1-0.2r/min; the safety valve 2 is an electromagnetic valve or an electric valve.
Further, the material storage tank 1 is connected with a screw extruder, and the screw extruder is used for conveying materials in the material storage tank 1 to the multi-row blowing mechanism 4 through the pipeline.
Optionally, meshes are arranged on the conveyor belt 7 and the negative pressure air suction net 5, the negative pressure air suction fan 6 is positioned in the conveyor belt 7, and the falling precursor oxide fiber can be adsorbed by the negative pressure air suction net 5 to form a net (the wind speed is 100-200 r/s) through the negative pressure air suction fan 6, and the conveyor belt 7 drives the negative pressure air suction net 5 to move forwards at the speed of 1-5mm/s, so that the precursor alumina continuous fiber blanket with the thickness of 1-100mm is formed.
The working principle of the embodiment is as follows: raw materials required by a sol-gel method are added into a storage tank, spinning solution in the storage tank is conveyed into a multi-row blowing mechanism through a metering pump at a proper rotating speed (0.1-0.2 r/min), the radius of a first layer of spinning holes of the multi-row blowing mechanism is 0.3-0.6mm, a second layer of spinning holes are positioned right below the first layer of spinning holes, and the ratio of the radius of the spinning holes to the distance between the two layers of spinning holes is 1:10-1:80, the spinneret holes are arranged in a manner of 2*5-20 x 100, and the hole spacing is 2-15mm. The negative pressure suction fan works at the frequency of 0.5-2Hz, so that on one hand, the precursor alumina fiber between the two layers of spinning holes can be cooled, and on the other hand, the precursor alumina fiber can be blown off by virtue of the side vent holes. The falling precursor oxidized fiber is adsorbed by a negative pressure air suction net to form a net (the wind speed is 100-200 r/s), a conveyor belt drives the negative pressure air suction net to move forwards at the speed of 1-5mm/s to form a precursor alumina continuous fiber blanket with the thickness of 1-100mm, and then sintering is started, wherein the specific process of sintering is as follows: heating to 700 ℃ at a low rate, and preserving heat for 30min; and then heating the blanket from 700 ℃ to 800, 900, 1000, 1100 and 1200 ℃ in turn at a higher heating rate, preserving heat for 30min, taking out, and cooling at room temperature to obtain the alumina continuous fiber blanket with the final thickness of 5-150 mm.
Example 2
The embodiment provides an auxiliary alumina continuous fiber blanket forming method, which adopts the auxiliary alumina continuous fiber blanket forming multi-row blowing device provided by the embodiment 1, and comprises the following steps:
(1) Placing the prepared alumina spinning solution in a storage tank, and conveying the alumina spinning solution through a safety valve and a safety pump;
(2) Introducing the alumina spinning solution in the step (1) into a multi-row blowing mechanism;
(3) In the step (2), the upper surface and the lower surface of the multi-row blowing mechanism are provided with spinning holes according to actual demands, the radius of the spinning holes is 0.25-1mm, the distance between the spinning holes is 2-15mm, the side surface of the multi-row blowing mechanism is provided with vent holes, the radius of the vent holes is 1-20mm, and the ratio (aperture ratio) of the diameter of the spinning holes to the distance between the first layer of spinning holes and the second layer of spinning holes is 1:10-1:80;
(4) Drawing spinning solution into filaments through a multi-row blowing mechanism in the step (3) through a spinneret hole, cooling through a vent hole, and blowing off the filaments by a negative pressure suction fan to form alumina short fibers;
(5) The alumina short fibers obtained in the step (4) are adsorbed by a negative pressure air suction net to form a net, and a conveyor belt drives the negative pressure air suction net to move forwards at a speed of 1-5mm/s to form a precursor alumina continuous fiber blanket with a thickness of 1-100 mm;
(6) And (5) performing heat treatment on the alumina continuous fiber blanket preform obtained in the step (5) to form a final alumina continuous fiber blanket.
Example 3
This example is a process flow explored to obtain alumina continuous fiber blankets of relatively thin (< 20 mm) thickness.
The storage tank is mainly used for storing the aluminum oxide spinning solution synthesized according to the formula. Further, the alumina spinning solution is provided by the company of the Luoyang refractory materials institute of middle-steel group, aluminum powder is poured into hot crystalline aluminum chloride aqueous solution in batches and stirred uniformly to obtain polyaluminium chloride mother solution, the mother solution is mixed with silica sol in proportion, and then PEG is added, and then the mixture is distilled under reduced pressure to obtain gel spinning solution with certain viscosity.
The alumina spinning solution reaches the metering pump through the safety valve, the rotating speed of the metering pump is 0.1-0.5r/min, and further, the rotating speed is preferably 0.15r/min.
The alumina spinning solution reaches the multi-row blowing mechanism through the metering pump, the inside of the multi-row blowing mechanism is hollow, and the upper surface and the lower surface of the multi-row blowing mechanism are provided with completely consistent spinneret orifices, as shown in figure 2, the radius R of the spinneret orifices is 0.25-1mm, and further, the radius R of the spinneret orifices is preferably 0.5mm. The transverse and longitudinal orifices are aligned 9*2. The lateral pitch Tx of the orifices is 2-15mm and the longitudinal pitch Ty is 2-15mm, and further, the lateral pitch Tx of the orifices is preferably 4mm and the longitudinal pitch Ty is preferably 8mm.
The side surfaces of the multiple row blowing mechanism are provided with vent holes, as shown in fig. 3, the radius r of the vent holes is 1-20mm, further, the radius r of the vent holes is preferably 2mm, the number arrangement of vent holes is preferably 18 x 2, and the ratio (aperture ratio) of the vent hole radius to the space Y between the first layer of spinneret holes and the second layer of spinneret holes is 1:10-1:80, further, the aperture ratio is preferably 1:20, the spacing Y between the first layer of orifices and the second layer of orifices was 10mm.
The negative pressure suction fans arranged on the side of the multi-row blowing mechanism work at the frequency of 0.5Hz-2Hz, and further, the frequency of the negative pressure suction fans is preferably 1Hz. The rotating speed of the negative pressure suction fan is 200-300r/min, further, the rotating speed of the negative pressure suction fan is preferably 250r/min, when the negative pressure suction fan works, air cools and shapes filiform spinning solution through side vent holes of the multi-row blowing mechanism, and in addition, the negative pressure suction fan blows off alumina precursor fibers which have passed through the second layer of spinning holes to form alumina short fibers.
The alumina short fibers obtained through the multi-row blowing mechanism are adsorbed onto the negative pressure suction net by the negative pressure suction fan, the rotating speed of the negative pressure suction fan is 100-200r/min, further, the rotating speed of the negative pressure suction fan is preferably 150r/min, meanwhile, the negative pressure suction net moves forwards at a speed of 1-5mm/s, and further, the speed of the negative pressure suction net moving forwards is preferably 4mm/min.
The thickness of the alumina continuous fiber blanket preform obtained by the above steps was up to 15mm. Further, starting sintering, heating to 700 ℃ at a low rate, and preserving heat for 30min; and then heating the blanket from 700 ℃ to 800, 900, 1000, 1100 and 1200 ℃ in turn at a higher heating rate, preserving heat for 30min, taking out, and cooling at room temperature to obtain the alumina continuous fiber blanket with the final thickness reaching 10mm.
The alumina continuous fiber blanket obtained by the process has good forming and tensile strength reaching 5.78MPa.
Comparative example 1
The radius R of the spinneret holes in example 3 was adjusted to 0.2mm in order to obtain lower fineness of the alumina precursor staple fibers, to enhance the bond strength of the alumina continuous fiber blanket, and otherwise to remain the same as in example 3.
In the preparation process, it can be found that the alumina spinning solution with certain viscosity is difficult to pass through the spinneret orifices because the radius of the spinneret orifices is too small, continuous alumina precursor fibers cannot be formed, the alumina short fibers obtained on the negative pressure induced draft net are different in length, and the length uniformity rate cannot meet the actual requirements.
Comparative example 2
The radius R of the spinneret hole in example 3 was adjusted to 1mm in order to obtain alumina precursor staple fibers having higher fineness, and the uniformity of formation of the staple fibers was improved, which remained the same as in example 3.
In the preparation process, it can be found that the existing negative pressure suction fan cannot blow the alumina precursor fiber to form short fibers because the fiber is thicker, but after the rotation speed of the negative pressure suction fan is increased, the wind speed between the first layer of spinning holes and the second layer of spinning holes is too high, so that the fiber is blown off without being molded, and the length uniformity of the short fibers is not improved, so that the actual requirements cannot be met.
Comparative example 3
The aperture ratios in adjustment example 3 were 1: 10. 1: 30. 1: 40. 1: 50. 1: 60. 1:70 and 1:80. other procedure was consistent with example 3 to give alumina continuous fiber blanket tensile strengths of example 3 at different pore ratios as shown in table 1 below.
Table 1 tensile strength of alumina continuous fiber blanket of different aperture ratios in example 3
| Aperture ratio | Tensile Strength (MPa) |
| 1：10 | 5.6 |
| 1:20 Example 3 | 5.78 |
| 1：30 | 5.7 |
| 1：40 | 5.0 |
| 1：50 | 4.1 |
| 1：60 | 4.1 |
| 1：70 | 2.8 |
| 1：80 | 0.1 |
From the results obtained in table 1, it was found that the strength of the resulting alumina continuous fiber blanket was significantly reduced with an increase in the aperture ratio because the entanglement between fibers was more pronounced due to the increase in fiber length, but because the uniformity of fiber length was reduced, defects were likely to occur in the alumina continuous fiber blanket, and stress concentration and breakage were more likely to occur at the defects in the strength test.
Example 4
This example is a process flow explored to obtain alumina continuous fiber blankets of relatively thick (> 100 mm) thickness.
The alumina spinning solution prepared in the storage tank reaches the metering pump through the safety valve, and the rotating speed of the metering pump is further preferably 0.5r/min.
The alumina spinning solution reaches the position of the multi-row blowing mechanism through a metering pump, and the radius R of the spinning holes is further preferably 0.8mm. The number of cross-direction and machine-direction orifices is preferably arranged in an array of 18 x 5. The lateral spacing of the orifices is preferably 10mm and the longitudinal spacing Ty is preferably 10mm.
The side surfaces of the multiple rows of blowing mechanisms are provided with vent holes, as shown in fig. 3, the radius r of the vent holes is preferably 5mm, the number and arrangement of vent holes are preferably 36 x 3, and the aperture ratio is preferably 1:60, the spacing Y between the first layer of orifices and the second layer of orifices is 30mm.
The negative pressure suction fan frequency is preferably 2Hz. The rotation speed of the negative pressure suction fan is preferably 200r/min, and the fiber is blown off to form short fibers while the alumina precursor fiber is cooled.
The alumina short fibers obtained through the multi-row blowing mechanism are adsorbed onto the negative pressure suction net by the negative pressure suction fan, the rotating speed of the negative pressure suction fan is preferably 120r/min, and the forward moving speed of the negative pressure suction net is preferably 2mm/min.
The thickness of the alumina continuous fiber blanket preform obtained by the above steps was up to 120mm. Further, starting sintering, heating to 700 ℃ at a low rate, and preserving heat for 30min; and then heating the blanket from 700 ℃ to 800, 900, 1000, 1100 and 1200 ℃ in turn at a higher heating rate, preserving heat for 30min, taking out, and cooling at room temperature to obtain the alumina continuous fiber blanket with the final thickness reaching 100 mm.
The alumina continuous fiber blanket obtained by the process has good forming and tensile strength reaching 7.32MPa.
Comparative example 4
The aperture ratios in adjustment example 4 were 1: 10. 1: 30. 1: 40. 1: 50. 1: 60. 1:70 and 1:80. other procedure was consistent with example 4 to give alumina continuous fiber blanket tensile strengths of example 4 at different pore ratios as shown in table 2 below.
Table 2 tensile strength of alumina continuous fiber blanket of different aperture ratios in example 4
| Aperture ratio | Tensile Strength (MPa) |
| 1：10 | 2.56 |
| 1：20 | 4.10 |
| 1：30 | 5.34 |
| 1：40 | 6.66 |
| 1：50 | 6.54 |
| 1：60 | 7.21 |
| 1:70 Example 4 | 7.32 |
| 1：80 | 7.10 |
It can be seen that as the aperture ratio increases, the tensile strength of the alumina continuous fiber blanket is greatly improved, because as the fineness of the alumina precursor staple fibers increases, the overall strength of the fibers is improved, and the greater aperture ratio makes the staple fibers falling on the negative pressure suction net more likely to intertwine, and the frictional force between the fibers is improved, so that the overall strength of the alumina continuous fiber blanket is improved.
The scope of the present utility model is not limited to the above-described embodiments, but is intended to be limited to the appended claims, any modifications, equivalents, improvements and alternatives falling within the spirit and principle of the inventive concept, which can be made by those skilled in the art.
Claims (10)
1. The multi-row blowing device for assisting in forming the aluminum oxide continuous fiber blanket is characterized by comprising a storage tank, a multi-row blowing mechanism and a hollow cylinder, wherein the storage tank is communicated with the multi-row blowing mechanism through a pipeline, the hollow cylinder is arranged below the multi-row blowing mechanism and is communicated with the hollow cylinder, a negative pressure suction fan is communicated below the hollow cylinder, a negative pressure suction net and a conveying belt are further arranged between the hollow cylinder and the negative pressure suction fan, the negative pressure suction net is positioned above the conveying belt, and the conveying belt drives the negative pressure suction net to move; the upper surface and the lower surface of the multi-row blowing mechanism are respectively provided with a first layer of spinning holes and a second layer of spinning holes, and a plurality of first layer of spinning holes and a plurality of second layer of spinning holes are in one-to-one correspondence.
2. The apparatus of claim 1, wherein the interior of the multi-row blowing mechanism is hollow, and the first layer of orifices have the same size as the second layer of orifices.
3. The multi-row blowing device for assisting in forming an alumina continuous fiber blanket according to claim 1, wherein a plurality of vent holes are arranged on the side surface of the multi-row blowing mechanism.
4. The multi-row blowing device for assisting in forming the continuous fiber blanket of aluminum oxide according to claim 2, wherein the radius of the first layer of the spinneret holes and the radius of the second layer of the spinneret holes of the multi-row blowing mechanism are 0.3-0.6mm, and the distance between the spinneret holes is 2-15mm.
5. The apparatus of claim 4, wherein the ratio of the radius of the orifices to the spacing between the first and second orifices is 1:10-1:80.
6. a multi-row blowing device for assisting in the formation of alumina continuous fiber blanket according to claim 1, wherein the pipe is provided with a safety valve and a metering pump.
7. The multi-row blowing device for assisting in the formation of alumina continuous fiber blanket according to claim 6, wherein the safety valve is an electromagnetic valve or an electric valve.
8. The multi-row blowing device for assisting in the formation of alumina continuous fiber blanket according to claim 1, wherein the material storage tank is connected with a screw extruder for conveying the material in the material storage tank to the multi-row blowing mechanism through the pipeline.
9. The multi-row blowing device for assisting in forming an alumina continuous fiber blanket according to claim 1, wherein the conveyor belt and the negative pressure suction net are provided with meshes, and the negative pressure suction fan is positioned in the conveyor belt.
10. The multi-row blowing device for assisting in forming the alumina continuous fiber blanket according to claim 1, wherein the multi-row blowing mechanism is made of stainless steel, ceramic or silicon carbide.
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