Preparation method of silicon carbide nanowire aerogel and calcining furnace

Abstract

The invention belongs to the technical field of calcining furnaces, and particularly relates to a silicon carbide nanowire aerogel preparation method and a calcining furnace kilney.The calcining furnace comprises a base, an adjusting seat is rotationally arranged on the left side of the upper end face of the base, and a mounting disc is fixedly connected to the right end of the upper side of the adjusting seat; a plurality of shifting plates used for pushing mixed powder are arranged on the furnace body in an inserted and sliding mode, a magnetic block is arranged in the middle of one side of each shifting plate, and the magnetic blocks can be attracted to the edge of the furnace body. According to the device, in the calcination process of mixed powder, the furnace body is driven to rotate, the multiple stirring plates push the mixed powder in the inner cavity of the furnace body, when the mixed powder is pushed to the position above the inner cavity of the furnace body by the stirring plates, the mixed powder can fall off under the action of gravity, and the mixed powder can continuously move under the cooperation of the multiple stirring plates, so that the mixed powder is uniformly calcined. The dispersion degree of the mixed powder is improved by adding the dispersing agent, and the situation that the whole calcination effect is affected due to insufficient combustion of part of materials caused by the accumulation state of the mixed powder is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of calcining furnaces, in particular to a method for preparing silicon carbide nanowire aerogel and a calcining furnace. Background Art

[0002] Silicon carbide nanowire aerogel is a porous gel material formed by the self-assembly of silicon carbide nanowires. It has broad application prospects in many fields. During the preparation process of silicon carbide nanowire aerogel, a certain proportion of silicon powder, polytetrafluoroethylene powder and tungsten powder need to be evenly mixed to obtain a mixed powder. The mixed powder is dried and sieved, and then calcined. Calcination can promote the continuous growth of silicon carbide nanowires.

[0003] The patent with the announcement number CN216347721U discloses a multi-effect calcining furnace with a stable processing environment, including a box body, the inside of which is rotatably connected to the calcining furnace body, a furnace cover fixed to one side of the calcining furnace body, a gas supply branch pipe installed on both sides of the calcining furnace body inside the box body, a plurality of air nozzles installed on the gas supply branch pipe, an igniter installed on one side of the air nozzle, the gas supply branch pipe is connected to the gas supply main pipe passing through the box body, the tail end of the calcining furnace body is connected to a rotating disk rotating on the outer wall of the box body, and a plurality of driving slots are provided on the rotating disk. The patent has a novel structure and an ingenious design. The driving disk is driven to rotate by the rotating motor provided, and the rotating disk is driven to rotate intermittently through the driving arm, and finally the calcining furnace body is driven to rotate intermittently, which can ensure that the temperature inside the calcining furnace body is uniform, so that the material can be kept in a stable working environment, and the calcination quality of the material is guaranteed.

[0004] However, the above technical solution still has the following deficiencies in practical application: The materials are calcined by adding them into the calcining furnace body and then heating the calcining furnace body. However, after the materials are added into the calcining furnace body, they may be in a piled state. When the materials are piled up, some of the materials will not be heated enough, resulting in incomplete combustion and affecting the overall calcination effect.

[0005] To this end, the present invention provides a method for preparing silicon carbide nanowire aerogel and a calcining furnace. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background technology, the present invention proposes a method for preparing silicon carbide nanowire aerogel and a calcining furnace.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a silicon carbide nanowire aerogel calcining furnace, comprising a base, an adjustment seat is rotatably provided on the left side of the upper end surface of the base, a mounting plate is fixedly connected to the upper right end of the adjustment seat, a furnace body is rotatably provided on the left end surface of the mounting plate, a furnace door is rotatably provided on one side of the left end of the furnace body, a plurality of paddles for pushing mixed powder are plugged and slidably provided on the furnace body, and a magnetic block is provided in the middle of one side of the paddle plate, the magnetic block can be adsorbed with the edge of the furnace body, an igniter is fixedly connected to the middle of the right end surface of the mounting plate, the flame nozzle of the igniter and the mounting plate penetrate and extend into the inner cavity of the furnace body, and an intermittent plug-in lifting mechanism is provided on the mounting plate to prevent the mixed powder from being stuck at the angle between the paddle plate and the inner wall of the furnace body; The intermittent plug-in lifting mechanism includes a slide rail fixedly connected to the upper side of the left end surface of the mounting plate, the slide rail is plugged and slidably connected to a lifting plate, two slide rods are slidably connected to the left side of the lifting plate, a plug block is fixedly connected to the rear end of the slide rod, a plug interface is provided on one side of the shift plate, and the plug block can be plugged with the plug interface.

[0008] Preferably, a vacuum pump is fixedly connected to the upper side of the right end surface of the mounting plate, and the air inlet end of the vacuum pump is connected to an exhaust pipe, and the exhaust pipe passes through the mounting plate and extends to the inner cavity of the furnace body. An air inlet passes through and is fixedly connected to one side of the mounting plate, and the air inlet extends to the inner cavity of the furnace body.

[0009] Preferably, a gear ring is sleeved and fixedly connected on the right side of the furnace body, a gear is rotatably arranged on the middle part of the front side of the left end face of the mounting plate, the gear is meshed with the outer ring tooth block of the gear ring, a motor is fixedly connected on the middle part of the front side of the right end face of the mounting plate, and the output end of the motor is fixedly connected to the gear.

[0010] Preferably, a motor three is fixedly connected to the upper side of the left end surface of the mounting plate, a threaded rod one is fixedly connected to the output end of the motor three, the upper and lower ends of the threaded rod one are rotatably arranged on the mounting plate, and the threaded rod one is threadedly connected to the right end of the lifting plate.

[0011] Preferably, an electric push rod is fixedly connected to the left side of the front end surface of the lifting plate, and the piston end of the electric push rod is fixedly connected to the middle part of the front end of the plug block.

[0012] Preferably, a flattening column is inserted and slidably connected to one side of the mounting plate, the flattening column is threadedly connected to a threaded rod three, a mounting rod is rotatably provided at the right end of the threaded rod three, and the left end of the mounting rod is fixedly connected to the mounting plate.

[0013] Preferably, the right end surface of the mounting rod is fixedly connected to the motor 2, and the output end of the motor 2 is fixedly connected to the right end of the threaded rod 3.

[0014] Preferably, a connecting rod is rotatably provided at the middle part of the lower end surface of the adjustment seat, a sliding block is rotatably provided at the lower end of the connecting rod, and the sliding block is slidably connected to the base.

[0015] Preferably, the lower end of the slider is threadedly connected to a threaded rod 2, both ends of the threaded rod 2 are rotatably arranged on the base, a motor 4 is fixedly connected to the middle of the right end surface of the base, and the output end of the motor 4 is fixedly connected to the right end of the threaded rod 2.

[0016] A method for preparing silicon carbide nanowire aerogel comprises the following specific steps: S1. Using anhydrous ethanol as solvent, a certain proportion of silicon powder, polytetrafluoroethylene powder and tungsten powder are mixed uniformly by ball milling; S2, drying and sieving the mixed powder, and transferring it to the furnace body; S3, after the furnace is evacuated, argon gas of a certain pressure is filled in, and the mixed powder is ignited locally using an igniter. The high heat released by the combustion reaction and the high gas pressure generated can promote the continuous growth of silicon carbide nanowires, thereby quickly constructing aerogel in three-dimensional space; S4. After the combustion reaction is completed, the lightweight block in the furnace is taken out and oxidized and decarbonized in the air to obtain silicon carbide nanowire aerogel.

[0017] The beneficial effects of the present invention are as follows: 1. The method for preparing silicon carbide nanowire aerogel and the calcining furnace of the present invention can drive the furnace body to rotate during the calcination of the mixed powder, and multiple paddles can push the mixed powder in the inner cavity of the furnace body. When the mixed powder is pushed to the top of the inner cavity of the furnace body by the paddle, the mixed powder will fall under the action of gravity. The mixed powder will disperse during the falling process and fall to the bottom of the inner cavity of the furnace body again, and then be pushed by the remaining paddles. With the cooperation of multiple paddles, the mixed powder can be kept in motion to improve the dispersion degree of the mixed powder. This avoids the situation where part of the materials are not fully burned due to the accumulation of mixed powder, thereby affecting the overall calcination effect. In addition, since the furnace body rotates intermittently and uses an intermittent plug-in lifting mechanism, when a paddle is in the middle position above the furnace body and is in a vertical state, the plug block is driven to move and insert into the plug interface, and then the lifting plate is raised. The plug block can be used to drive the paddle plate to rise, so that the end surfaces on both sides of the paddle plate are scraped against the edge of the furnace body until the bottom of the paddle plate is retracted to the edge of the furnace body, and the paddle plate does not separate from the furnace body. At this time, The paddle plate and the inner wall of the furnace body no longer form an angle, so that the mixed powder stuck at the angle can fall off, thereby avoiding the situation that when the mixed powder accumulates at the angle between the paddle plate and the inner wall of the furnace body, part of the mixed powder is stuck at the angle due to the mutual extrusion between the mixed powders, resulting in the mixed powder being unable to fall normally, affecting the dispersion effect of the mixed powder. In addition, when the mixed powder is at the angle between the paddle plate and the inner wall of the furnace body and is aligned with the flattening column, the flattening column can be driven to slide horizontally to push the mixed powder, and the mixed powder above the lower end surface of the flattening column can be pushed. It will collapse and become a flat state, so that the mixed powder can be evenly spread at the angle between the paddle and the inner wall of the furnace body. Then the flattening column is reset, and the paddle is driven to move to push the mixed powder, so that the mixed powder will not be concentrated in the same position when it falls, further ensuring the dispersion of the mixed powder, and every time a paddle is driven up by the plug block, the flattening column can also move to flatten the mixed powder, ensuring that the mixed powder is in a flat state before each fall, thereby ensuring the continuous combustion effect of the mixed powder.

[0018] 2. The method for preparing silicon carbide nanowire aerogel and the calcining furnace described in the present invention utilize motor 4 to drive threaded rod 2 to rotate, so that the slider can be moved laterally and the connecting rod can be rotated, thereby rotating the furnace body. When it is necessary to take out the lightweight blocks obtained by combustion, the furnace body can be driven to tilt so that the lightweight blocks can slide out of the furnace body under the action of gravity, thereby making it easier to collect the lightweight blocks obtained by combustion.

[0019] 3. The silicon carbide nanowire aerogel preparation method and calcination furnace described in the present invention have excellent properties such as high temperature resistance, acid and alkali corrosion resistance, low thermal conductivity, high compressible recovery performance, and good hydrophobicity. In addition, its density can be controlled in a wide range and can be used as high-temperature filter materials, thermal insulation materials, catalyst carriers, etc. There is a huge market demand in the fields of aerospace, automobile industry, energy, chemical industry, construction, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the local three-dimensional structure at the installation plate; Figure 3 It is a schematic diagram of the local three-dimensional structure at the lifting plate; Figure 4 It is a schematic diagram of the local three-dimensional structure of the slider; Figure 5 It is a schematic diagram of the local three-dimensional structure of the furnace body; Figure 6 It is a schematic diagram of the local three-dimensional structure of the adjustment seat; Figure 7 yes Figure 6 A partial enlarged view of the middle part; Figure 8 1. It is a schematic diagram of the planar structure of the dial plate; Fig. 9 It is a schematic diagram of the local three-dimensional structure at the flattened column; Fig.10 It is a process flow chart of the preparation of silicon carbide nanowire aerogel; Fig.11 This is a macroscopic photo of silicon carbide nanowire aerogel; Fig.12 is the XRD pattern of silicon carbide nanowire aerogel; Fig.13 is a SEM photo of silicon carbide nanowire aerogel; Fig.14 This is a table of properties of silicon carbide nanowire aerogel.

[0022] In the figure: 1. base; 2. adjustment seat; 3. furnace body; 4. furnace door; 5. mounting plate; 6. dial plate; 7. plug interface; 8. gear; 9. motor one; 10. mounting rod; 11. leveling column; 12. motor two; 13. gear ring; 14. motor three; 15. threaded rod one; 16. lifting plate; 17. electric push rod; 18. slide rod; 19. plug block; 20. flame nozzle; 21. air inlet; 22. exhaust pipe; 23. motor four; 24. connecting rod; 25. threaded rod two; 26. slide block; 27. vacuum pump; 28. igniter; 29. ​​threaded rod three; 30. slide rail; 31. magnetic block. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Please refer to Figure 1-Figure 14 The present invention provides a technical solution: a silicon carbide nanowire aerogel calcining furnace, comprising a base 1, an adjusting seat 2 is rotatably provided on the left side of the upper end surface of the base 1, a mounting plate 5 is fixedly connected to the upper right end of the adjusting seat 2, a furnace body 3 is rotatably provided on the left end surface of the mounting plate 5, a furnace door 4 is rotatably provided on one side of the left end of the furnace body 3, a plurality of paddles 6 for pushing mixed powder are plugged and slidably provided on the furnace body 3, and a magnetic block 31 is provided in the middle of one side of the paddle 6, the magnetic block 31 can be adsorbed with the edge of the furnace body 3, an igniter 28 is fixedly connected to the middle of the right end surface of the mounting plate 5, a flame nozzle 20 of the igniter 28 and the mounting plate 5 penetrate and extend to the inner cavity of the furnace body 3, and an intermittent plug-in lifting mechanism is provided on the mounting plate 5 to prevent the mixed powder from being stuck at the angle between the paddle 6 and the inner wall of the furnace body 3; The intermittent plug-in lifting mechanism includes a slide rail 30 fixedly connected to the upper side of the left end surface of the mounting plate 5, the slide rail 30 is plugged and slidably connected to the lifting plate 16, two slide rods 18 are slidably connected to the left side of the lifting plate 16, and a plug block 19 is fixedly connected to the rear end of the slide rod 18. A plug interface 7 is provided on one side of the dial plate 6, and the plug block 19 can be plugged with the plug interface 7.

[0025] In this embodiment, Figure 1-3 , Figure 5-Figure 9 As shown, a vacuum pump 27 is fixedly connected to the upper side of the right end surface of the mounting plate 5, and an exhaust pipe 22 is connected to the air inlet end of the vacuum pump 27. The exhaust pipe 22 penetrates the mounting plate 5 and extends to the inner cavity of the furnace body 3. An air inlet 21 is penetrated and fixedly connected to one side of the mounting plate 5, and the air inlet 21 extends to the inner cavity of the furnace body 3; A gear ring 13 is sleeved and fixedly connected to the right side of the furnace body 3, a gear 8 is rotatably arranged in the middle of the front side of the left end face of the mounting plate 5, the gear 8 is meshed with the outer ring gear block of the gear ring 13, a motor 9 is fixedly connected to the middle of the front side of the right end face of the mounting plate 5, and the output end of the motor 9 is fixedly connected to the gear 8; A motor 3 14 is fixedly connected to the upper side of the left end surface of the mounting plate 5, and a threaded rod 15 is fixedly connected to the output end of the motor 3 14. The upper and lower ends of the threaded rod 15 are rotatably arranged on the mounting plate 5, and the threaded rod 15 is threadedly connected to the right end of the lifting plate 16; An electric push rod 17 is fixedly connected to the left side of the front end surface of the lifting plate 16, and the piston end of the electric push rod 17 is fixedly connected to the middle part of the front end of the plug block 19; A flattening column 11 is inserted and slidably connected to one side of the mounting plate 5, and the flattening column 11 is threadedly connected to a threaded rod 3 29, and a mounting rod 10 is rotatably provided at the right end of the threaded rod 3 29, and the left end of the mounting rod 10 is fixedly connected to the mounting plate 5; The right end surface of the mounting rod 10 is fixedly connected to the motor 2 12, and the output end of the motor 2 12 is fixedly connected to the right end of the threaded rod 3 29; Specifically, silicon carbide nanowire aerogel is a porous gel material formed by self-assembly of silicon carbide nanowires, and has broad application prospects in multiple fields. In the preparation process of silicon carbide nanowire aerogel, a certain proportion of silicon powder, polytetrafluoroethylene powder and tungsten powder need to be evenly mixed to obtain a mixed powder, and the mixed powder is dried and sieved, and then calcined. The calcination can promote the continuous growth of silicon carbide nanowires. When the existing calcining furnace is used, the material is added into the calcining furnace body, and then the calcining furnace body is heated to calcine the material. However, after the material is added into the calcining furnace body, it may be in a piled state. When the material is piled up, part of the material will be insufficiently heated, resulting in incomplete combustion, affecting the overall calcination effect. Therefore, in order to solve the above problems, when using this embodiment, the mixed powder to be calcined is added into the furnace body 3, and then the furnace door 4 is closed, and the inside of the furnace body 3 is evacuated into a vacuum by using the vacuum pump 27 and the exhaust pipe 22, and then a certain pressure of argon gas is filled into the furnace body 3 by using the air inlet 21, and then the mixed powder is ignited by the igniter 28. The high heat released by the combustion reaction and the high pressure generated can promote the continuous growth of silicon carbide nanowires; At the same time, the gear 8 is driven to rotate by the motor 9, so that the gear ring 13 and the furnace body 3 can rotate at the same time. When the furnace body 3 rotates, the multiple paddles 6 will also rotate synchronously to push the mixed powder in the inner cavity of the furnace body 3. When the mixed powder is pushed to the upper part of the inner cavity of the furnace body 3 by the paddle 6, the mixed powder will fall under the action of gravity. The mixed powder will disperse in the falling process and fall to the bottom of the inner cavity of the furnace body 3 again, and then be pushed by the remaining paddles 6. With the cooperation of the multiple paddles 6, the mixed powder can be continuously moved to improve the dispersion degree of the mixed powder, thereby avoiding the situation that the mixed powder is in a piled state, resulting in incomplete combustion of some materials, thereby affecting the overall calcination effect. Furthermore, since the mixed powder is at the angle between the paddle plate 6 and the inner cavity of the furnace body 3 when it moves, when the mixed powder accumulates at the angle, part of the mixed powder may be stuck at the angle due to the mutual squeezing between the mixed powders, and then the mixed powder cannot fall normally, affecting the dispersion effect of the mixed powder. Therefore, the rotation mode of the furnace body 3 is intermittent rotation, and when a paddle plate 6 is in the middle position above the furnace body 3 and is in a vertical state, the electric push rod 17 drives the plug block 19 to move and insert it into the plug interface 7, and then the motor three 14 drives the threaded rod one 15 to rotate, so that the lifting plate 16 rises, and the plug block 19 can be used to drive the paddle plate 6 to rise, so that the end surfaces on both sides of the paddle plate 6 are aligned with the plug interface 7. The edge of the furnace body 3 is scraped until the bottom of the paddle 6 is retracted to the edge of the furnace body 3, and the paddle 6 does not separate from the furnace body 3. At this time, the paddle 6 and the inner wall of the furnace body 3 no longer form an angle, so that the mixed powder stuck at the angle can fall off, thereby avoiding the situation that when the mixed powder accumulates at the angle between the paddle 6 and the inner wall of the furnace body 3, part of the mixed powder is stuck at the angle due to the mutual extrusion between the mixed powders, and then the mixed powder cannot fall normally, affecting the dispersion effect of the mixed powder. When the powder at the angle falls, the paddle 6 is driven to reset again, and the paddle 6 is positioned by the magnetic block 31 and the furnace body 3 by adsorption, and will not slide into the furnace body 3, and the paddle 6 can continue to work; Furthermore, when the mixed powder is put into the furnace body 3, if the mixed powder is in a piled state, the mixed powder will fall to the same position each time it falls, and then pile up at the same position, which will still lead to incomplete combustion. Therefore, when the mixed powder is at the angle between the paddle plate 6 and the inner wall of the furnace body 3 and is aligned with the flattening column 11, the motor 2 12 can be used to drive the threaded rod 3 29 to rotate, so that the flattening column 11 slides horizontally to push the mixed powder, and the mixed powder that is higher than the lower end surface of the flattening column 11 will collapse and become flat. The mixed powder can be evenly spread on the angle between the paddle plate 6 and the inner wall of the furnace body 3, and then the flattening column 11 is reset, and the paddle plate 6 is driven to move to push the mixed powder, so that the mixed powder will not be concentrated in the same position when falling, and the dispersion of the mixed powder is further guaranteed. Moreover, every time a paddle plate 6 is driven to rise by the insert block 19, the flattening column 11 can also move to flatten the mixed powder, ensuring that the mixed powder is in a flat state before each fall, and ensuring the continuous combustion effect of the mixed powder. Finally, after the combustion reaction is finished, the furnace door 4 is opened and the light blocks obtained by the combustion are taken out.

[0026] In this embodiment, Figure 4 and Figure 6 As shown, a connecting rod 24 is rotatably provided at the middle of the lower end surface of the adjusting seat 2, and a sliding block 26 is rotatably provided at the lower end of the connecting rod 24, and the sliding block 26 is slidably connected to the base 1; The lower end of the slider 26 is threadedly connected with a threaded rod 25, both ends of the threaded rod 25 are rotatably arranged on the base 1, and the middle part of the right end surface of the base 1 is fixedly connected with a motor 4 23, and the output end of the motor 4 23 is fixedly connected to the right end of the threaded rod 25; Specifically, the motor 4 23 is used to drive the threaded rod 25 to rotate, so that the slider 26 can be moved laterally, and the connecting rod 24 can be rotated, thereby rotating the furnace body 3. When it is necessary to take out the lightweight blocks obtained by combustion, the furnace body 3 can be driven to tilt so that the lightweight blocks can slide out of the furnace body 3 under the action of gravity, thereby making it easier to collect the lightweight blocks obtained by combustion.

[0027] A method for preparing silicon carbide nanowire aerogel comprises the following specific steps: S1. Using anhydrous ethanol as solvent, a certain proportion of silicon powder, polytetrafluoroethylene powder and tungsten powder are mixed uniformly by ball milling; S2, drying and sieving the mixed powder, and then transferring it to the furnace body 3; S3, after the furnace body 3 is evacuated, argon gas of a certain pressure is filled into it, and the mixed powder is ignited locally by using the igniter 28. The high heat released by the combustion reaction and the high pressure generated can promote the continuous growth of silicon carbide nanowires, thereby quickly constructing aerogel in three-dimensional space; S4. After the combustion reaction is completed, the light blocks in the furnace body 3 are taken out and oxidized and decarbonized in the air to obtain silicon carbide nanowire aerogel.

[0028] Figure 10-Figure 14 They are respectively the preparation process flow chart of silicon carbide nanowire aerogel, the macroscopic photo of silicon carbide nanowire aerogel, the XRD spectrum of silicon carbide nanowire aerogel, the SEM photo of silicon carbide nanowire aerogel, and the performance table of silicon carbide nanowire aerogel.

[0029] Working principle: add the mixed powder to be calcined into the furnace body 3, then close the furnace door 4, use the vacuum pump 27 and the exhaust pipe 22 to evacuate the interior of the furnace body 3, then use the air inlet 21 to fill the interior of the furnace body 3 with argon gas of a certain pressure, and then use the igniter 28 to ignite the mixed powder. The high heat released by the combustion reaction and the high pressure generated can promote the continuous growth of silicon carbide nanowires; at the same time, use the motor 9 to drive the gear 8 to rotate, so that the ring gear 13 and the furnace body 3 can rotate at the same time. When the furnace body 3 rotates, the multiple paddles 6 will also rotate synchronously to push the mixed powder in the inner cavity of the furnace body 3. When the mixed powder When the powder is pushed to the top of the inner cavity of the furnace body 3 by the paddle 6, the mixed powder will fall down under the action of gravity, and the mixed powder will be dispersed in the falling process and fall to the bottom of the inner cavity of the furnace body 3 again, and then be pushed by the remaining paddles 6. With the cooperation of multiple paddles 6, the mixed powder can be kept moving to improve the dispersion of the mixed powder, thereby avoiding the situation that part of the material is not fully burned due to the accumulation of the mixed powder, thereby affecting the overall calcination effect; and, because the mixed powder is at the angle between the paddle 6 and the inner cavity of the furnace body 3 when it moves, when the mixed powder accumulates at the angle, it can be The mutual squeezing of the mixed powders may cause part of the mixed powders to be stuck at the angle, and the mixed powders may not fall normally, affecting the dispersion effect of the mixed powders. Therefore, the furnace body 3 rotates intermittently, and when a paddle plate 6 is in the middle position above the furnace body 3 and is in a vertical state, the electric push rod 17 drives the plug block 19 to move and insert it into the plug interface 7, and then the motor three 14 drives the threaded rod one 15 to rotate, so that the lifting plate 16 rises, and the plug block 19 can be used to drive the paddle plate 6 to rise, so that the end surfaces on both sides of the paddle plate 6 are scraped against the edge of the furnace body 3 until the bottom of the paddle plate 6 retracts to the edge of the furnace body 3. , and the paddle 6 does not separate from the furnace body 3. At this time, the paddle 6 and the inner wall of the furnace body 3 no longer form an angle, so that the mixed powder stuck at the angle can fall off, thereby avoiding the situation that when the mixed powder accumulates at the angle between the paddle 6 and the inner wall of the furnace body 3, part of the mixed powder is stuck at the angle due to the mutual squeezing between the mixed powders, and then the mixed powder cannot fall normally, affecting the dispersion effect of the mixed powder. When the powder at the angle falls, the paddle 6 is driven to reset again, and the paddle 6 is positioned by the magnetic block 31 and the furnace body 3 by adsorption, and will not slide into the furnace body 3, and the paddle 6 can continue to work;Furthermore, when the mixed powder is put into the furnace body 3, if the mixed powder is in a piled state, the mixed powder will fall to the same position every time it falls, and then accumulate at the same position, which will still lead to incomplete combustion. Therefore, when the mixed powder is at the angle between the paddle plate 6 and the inner wall of the furnace body 3 and is aligned with the flattening column 11, the motor 2 12 can be used to drive the threaded rod 3 29 to rotate, so that the flattening column 11 slides horizontally to push the mixed powder, and the mixed powder that is higher than the lower end surface of the flattening column 11 will collapse and become a flat state, so that the mixed powder can be evenly spread at the angle between the paddle plate 6 and the inner wall of the furnace body 3, and then the flattening column 11 is reset, and the paddle plate 6 is driven to move to flatten the mixed powder. The mixed powder is pushed, so that the mixed powder will not be concentrated in the same position when it falls, further ensuring the dispersion of the mixed powder, and every time a paddle 6 is driven up by the plug block 19, the flattening column 11 will also move to flatten the mixed powder, ensuring the continuous combustion effect of the mixed powder; finally, after the combustion reaction is completed, the furnace door 4 is opened, and the motor 4 23 is used to drive the threaded rod 25 to rotate, so that the slider 26 can be moved horizontally, and the connecting rod 24 can be rotated, so that the furnace body 3 can be rotated. When it is necessary to take out the light blocks obtained by combustion, the furnace body 3 can be driven to tilt, so that the light blocks slide out of the furnace body 3 under the action of gravity, and the light blocks obtained by combustion can be collected. ;

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A silicon carbide nanowire aerogel calcining furnace, comprising a base (1), characterized in that: An adjustment seat (2) is rotatably provided on the left side of the upper end surface of the base (1); a mounting plate (5) is fixedly connected to the upper right end of the adjustment seat (2); a furnace body (3) is rotatably provided on the left end surface of the mounting plate (5); a furnace door (4) is rotatably provided on one side of the left end of the furnace body (3); a plurality of paddles (6) for pushing the mixed powder are plugged in and slidably provided on the furnace body (3); a magnetic block (31) is provided in the middle of one side of the paddles (6); the magnetic block (31) can be adsorbed on the edge of the furnace body (3); an igniter (28) is fixedly connected to the middle of the right end surface of the mounting plate (5); a flame nozzle (20) of the igniter (28) and the mounting plate (5) penetrate and extend to the inner cavity of the furnace body (3); and an intermittent plug-in lifting mechanism is provided on the mounting plate (5) to prevent the mixed powder from being stuck at the angle between the paddles (6) and the inner wall of the furnace body (3); The intermittent plug-in lifting mechanism comprises a slide rail (30) fixedly connected to the upper side of the left end surface of the mounting plate (5); the slide rail (30) is plugged and slidably connected to a lifting plate (16); two slide bars (18) are slidably connected to the left side of the lifting plate (16); a plug block (19) is fixedly connected to the rear end of the slide bar (18); a plug interface (7) is provided on one side of the shifting plate (6); and the plug block (19) can be plugged into the plug interface (7).

2. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: A vacuum pump (27) is fixedly connected to the upper side of the right end surface of the mounting plate (5); an air inlet end of the vacuum pump (27) is connected to an exhaust pipe (22); the exhaust pipe (22) penetrates the mounting plate (5) and extends to the inner cavity of the furnace body (3); an air inlet (21) penetrates and is fixedly connected to one side of the mounting plate (5); and the air inlet (21) extends to the inner cavity of the furnace body (3).

3. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: A gear ring (13) is sleeved and fixedly connected to the right side of the furnace body (3); a gear (8) is rotatably arranged in the middle of the front side of the left end face of the mounting plate (5); the gear (8) and the outer ring gear block of the gear ring (13) are meshed with each other; a motor 1 (9) is fixedly connected to the middle of the front side of the right end face of the mounting plate (5); the output end of the motor 1 (9) is fixedly connected to the gear (8).

4. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: A motor three (14) is fixedly connected to the upper side of the left end surface of the mounting plate (5); a threaded rod one (15) is fixedly connected to the output end of the motor three (14); both upper and lower ends of the threaded rod one (15) are rotatably arranged on the mounting plate (5); and the threaded rod one (15) is threadedly connected to the right end of the lifting plate (16).

5. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: An electric push rod (17) is fixedly connected to the left side of the front end surface of the lifting plate (16), and the piston end of the electric push rod (17) is fixedly connected to the middle part of the front end of the insert block (19).

6. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: A flattening column (11) is plugged and slidably connected to one side of the mounting plate (5); a threaded rod three (29) is threadedly connected to the flattening column (11); a mounting rod (10) is rotatably provided at the right end of the threaded rod three (29); and a left end of the mounting rod (10) is fixedly connected to the mounting plate (5).

7. The silicon carbide nanowire aerogel calcining furnace according to claim 6, characterized in that: The right end surface of the mounting rod (10) is fixedly connected to the second motor (12), and the output end of the second motor (12) is fixedly connected to the right end of the third threaded rod (29).

8. The silicon carbide nanowire aerogel calcining furnace according to claim 1, characterized in that: A connecting rod (24) is rotatably provided at the middle of the lower end surface of the adjustment seat (2), a sliding block (26) is rotatably provided at the lower end of the connecting rod (24), and the sliding block (26) is slidably connected to the base (1).

9. The silicon carbide nanowire aerogel calcining furnace according to claim 8, characterized in that: The lower end of the slider (26) is threadedly connected to a second threaded rod (25), both ends of the second threaded rod (25) are rotatably arranged on the base (1), a fourth motor (23) is fixedly connected to the middle of the right end surface of the base (1), and the output end of the fourth motor (23) is fixedly connected to the right end of the second threaded rod (25).

10. A method for preparing silicon carbide nanowire aerogel, characterized in that: The calcining furnace kiln according to any one of claims 1 to 9 is used for preparation, comprising the following specific steps: S1. Using anhydrous ethanol as solvent, a certain proportion of silicon powder, polytetrafluoroethylene powder and tungsten powder are mixed uniformly by ball milling; S2, drying and sieving the mixed powder, and then transferring it to the furnace body (3); S3, after evacuating the furnace body (3), filling it with argon gas of a certain pressure, and using an igniter (28) to ignite the mixed powder locally. The high heat released by the combustion reaction and the high gas pressure generated can promote the continuous growth of silicon carbide nanowires, thereby quickly constructing aerogel in three-dimensional space; S4. After the combustion reaction is completed, the light block in the furnace body (3) is taken out and oxidized and decarbonized in air to obtain silicon carbide nanowire aerogel.

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