Aerogel composite sheet modification apparatus and method

Abstract

The application relates to a modification device and method of aerogel composite sheet. The modification device of the aerogel composite sheet comprises a modification box, a modifier supply component, a first modification gas path and a second modification gas path; an air outlet end of an air flow driving component is selectively communicated with the modifier supply component. The first modification gas path comprises a first modification gas inlet branch and a first modification gas outlet branch; the second modification gas path comprises a second modification gas inlet branch and a second modification gas outlet branch; the first modification gas inlet branch and the second modification gas inlet branch are both communicated with the modifier supply component; the first modification gas outlet branch and the second modification gas outlet branch are both communicated with an air inlet end of the air flow driving component; the first modification gas inlet branch and the second modification gas outlet branch are both selectively communicated with a first interface; and the second modification gas inlet branch and the first modification gas outlet branch are both selectively communicated with a second interface. The modification device of the gel composite sheet can realize uniform modification and is beneficial to improving the modification consistency of the aerogel composite sheet.

Description

Technical Field

[0001] This application relates to the field of aerogel modification technology, and in particular to a method and apparatus for modifying aerogel composite sheets. Background Technology

[0002] Aerogel composite sheets have low density, high porosity, excellent thermal insulation, flame retardancy and heat preservation properties, and are widely used in building energy conservation, industrial insulation, rail transportation, aerospace and other fields.

[0003] Traditional aerogel composite sheet modification equipment is mostly online. This type of aerogel composite sheet modification equipment has the following shortcomings: during modification, the modifier is not evenly distributed, resulting in poor modification consistency of the aerogel composite sheet. Summary of the Invention

[0004] Therefore, it is necessary to provide a device and method for modifying aerogel composite sheets to address the above problems. The modification is uniform, which is beneficial to improving the consistency of the modification of aerogel composite sheets.

[0005] On the one hand, an apparatus for modifying aerogel composite sheets is provided, comprising:

[0006] A modified box, wherein the modified box has a first interface and a second interface, the first interface and the second interface being arranged opposite to each other in the axial direction of the modified box; and

[0007] A modifier supply component capable of outputting atomized modifier;

[0008] An airflow driving component, wherein the air outlet of the airflow driving component can be selectively connected to the modifier supply component, and the airflow driving component is used to drive the flow of modifier airflow;

[0009] The first modified gas path includes a first modified intake branch and a first modified exhaust branch;

[0010] The second modified gas path includes a second modified intake branch and a second modified exhaust branch;

[0011] The first modified air intake branch and the second modified air intake branch are both connected to the modifier supply component, the first modified air outlet branch and the second modified air outlet branch are both connected to the air inlet end of the airflow drive component, the first modified air intake branch and the second modified air outlet branch are both selectively connected to the first interface, and the second modified air intake branch and the first modified air outlet branch are both selectively connected to the second interface.

[0012] In one embodiment, the modification box includes a box body, a first diversion plate group, and a second diversion plate group. The box body has a first interface and a second interface. The first diversion plate group and the second diversion plate group are both disposed within the box body. The first diversion plate group and the second diversion plate group are distributed at intervals along the axial direction of the modification box. The first diversion plate group is disposed near the first interface, and the second diversion plate group is disposed near the second interface. A receiving area is formed between the first diversion plate group and the second diversion plate group. The receiving area is used to receive the aerogel composite sheet to be modified. The first diversion plate group and the second diversion plate group both include a diversion baffle. The diversion baffle is connected to the box body, and the diversion baffle has multiple diversion holes that penetrate along the axial direction of the modification box. The multiple diversion holes on the same diversion baffle are distributed at intervals.

[0013] In one embodiment, the first diversion plate group includes at least two diversion baffles, the at least two diversion baffles in the first diversion plate group are distributed at intervals along the axial direction of the modified box, and the diversion holes on two adjacent diversion baffles in the first diversion plate group are staggered.

[0014] And / or, the second diversion plate group includes at least two diversion baffles, the at least two diversion baffles in the second diversion plate group are distributed at intervals along the axial direction of the modified box, and the diversion holes on two adjacent diversion baffles in the second diversion plate group are staggered.

[0015] In one embodiment, the box also includes a support, and the box body is rotatably connected to the support via a rotating shaft. The axis of the rotating shaft is perpendicular to the axis of the modified box, and the box body is rotatable about the axis of the rotating shaft. The modified box also includes a cover, and the box body has a loading port at the position between the first interface and the second interface. The cover is used to seal the loading port.

[0016] In one embodiment, the system further includes modified valve components, which include a first modified valve, a second modified valve, a third modified valve, and a fourth modified valve. The first modified valve is disposed on the first modified intake branch, the second modified valve is disposed on the first modified outlet branch, the third modified valve is disposed on the second modified intake branch, and the fourth modified valve is disposed on the second modified outlet branch.

[0017] In one embodiment, the system further includes a heater, a first residual gas path, a second residual gas path, an exhaust gas treatment unit, and a residual gas discharge valve. The air inlet of the heater is selectively connected to the air outlet of the airflow drive component. The first residual gas path includes a first residual gas inlet branch and a first residual gas outlet branch. The second residual gas path includes a second residual gas inlet branch and a second residual gas outlet branch. The residual gas discharge valve includes a first residual gas discharge valve. The modified valve also includes a fifth modified valve and a sixth modified valve. The first residual gas discharge valve and the fifth modified valve are both disposed on the air inlet of the airflow drive component, and the sixth modified valve is disposed on the air outlet of the airflow drive component.

[0018] The first and second residual air intake branches are selectively connected to the air outlet of the heater, the first and second residual air outlet branches are connected to the waste gas treatment unit, the first and second residual air intake branches are selectively connected to the first interface, and the first and second residual air intake branches are selectively connected to the second interface.

[0019] In one embodiment, the system further includes a residual discharge valve assembly, which includes a second residual discharge valve, a third residual discharge valve, a fourth residual discharge valve, and a fifth residual discharge valve. The second residual discharge valve is disposed on the first residual discharge inlet branch, the third residual discharge valve is disposed on the first residual discharge outlet branch, the fourth residual discharge valve is disposed on the second residual discharge inlet branch, and the fifth residual discharge valve is disposed on the second residual discharge outlet branch.

[0020] On the other hand, a method for modifying an aerogel composite sheet is also provided, comprising the above-mentioned modification apparatus, including the following steps: loading the aerogel composite sheet into the modification chamber; the modifier supply component outputting an atomized modifier; the modifier entering the interior of the modification chamber from the first modification inlet branch, then exiting from the first modification outlet branch and flowing back to the modifier supply component via the airflow drive component, thereby forming a positive circulation flow of the modifier in the modification chamber; after a predetermined time, switching the airflow direction of the modifier, so that the modifier enters the interior of the modification chamber from the second modification inlet branch, then exiting from the second modification outlet branch and flowing back to the modifier supply component via the airflow drive component, thereby forming a reverse circulation flow of the modifier in the modification chamber.

[0021] In one embodiment, the modifier is kept in forward circulation in the modification chamber for a duration of t1, and the modifier is kept in reverse circulation in the modification chamber for a duration of t2, where t1 = t2.

[0022] In one embodiment, a residue removal operation is further included, which comprises the following steps:

[0023] The heated exhaust gas is fed into the modified box from the first interface through the first exhaust gas inlet branch, and output from the second interface and transported to the waste gas treatment unit through the first exhaust gas outlet branch, so that the exhaust gas flows in the positive direction inside the modified box.

[0024] The heated exhaust gas is fed into the modified box through the second interface via the second exhaust gas inlet branch, and then output from the first interface and transported to the waste gas treatment unit via the second exhaust gas outlet branch, so that the exhaust gas flows in reverse inside the modified box.

[0025] The aforementioned aerogel composite sheet modification device is configured such that both the first modification inlet branch and the second modification outlet branch are selectively connected to the first interface, and both the second modification inlet branch and the first modification outlet branch are selectively connected to the second interface. With the cooperation of the modifier supply component and the airflow drive component, the device can switch between the first modification air path and the second modification air path, allowing one of them to be connected in the modification device. This switches the interface for the modifier to enter and exit the modification box, enabling the modifier to circulate forward and backward within the modification box. During these forward and reverse circulations, the modifier is evenly distributed throughout the modification box, ensuring uniform contact between the modifier and the aerogel composite sheet inside. This results in uniform modification of the aerogel composite sheet within the modification box, effectively improving the modification consistency of the aerogel composite sheet. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the device for modifying aerogel composite sheets in some embodiments of the present invention.

[0027] Figure 2 This is a schematic diagram of the modified box and support structure at an angle in some embodiments of the present invention.

[0028] Figure 3 This is a schematic diagram of the modified box and bracket from another angle in some embodiments of the present invention.

[0029] Figure 4 This is a structural diagram of the suspended basket and aerogel composite sheet assembly in some embodiments of the present invention.

[0030] 1. Modification box; 11. Box body; 12. First interface; 13. Second interface; 14. Diversion baffle; 15. Spare vent; 16. Cover; 17. Rotating shaft; 2. Airflow drive component; 3. Modifier supply component; 31. Atomizing tank; 311. Air inlet; 312. Air outlet; 32. Feed pump; 33. Weighing tank; 4. Support; 5. Basket; 51. Main body; 52. Ventilation support; 6. Heater; 7. Modification valve; 71. First modification valve; 72. Second modification valve; 73. Third modification valve; 74. Fourth modification valve; 75. Fifth modification valve; 76. Sixth modification valve; 8. Residue discharge valve; 81. First residue discharge valve; 8 2. Second residual gas valve; 83. Third residual gas valve; 84. Fourth residual gas valve; 85. Fifth residual gas valve; 86. Sixth residual gas valve; 9. First temperature detector; 10. Second temperature detector; 100. Aerogel composite sheet; 200. Waste gas treatment unit; 300a. First modified air inlet branch; 300b. First modified air outlet branch; 400a. Second modified air inlet branch; 400b. Second modified air outlet branch; 500a. First residual gas inlet branch; 500b. First residual gas outlet branch; 600a. Second residual gas inlet branch; 600b. Second residual gas outlet branch; 700. Third modified gas path; 800. Third residual gas path. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figures 1 to 4This application discloses a modification device (hereinafter referred to as the modification device) for an aerogel composite sheet 100, comprising a modification box 1, a modifier supply component 3, an airflow driving component 2, a first modification air path, and a second modification air path. The modification box 1 has a first interface 12 and a second interface 13, which are arranged axially opposite to each other. The modifier supply component 3 can output atomized modifier. The airflow driving component 2 is disposed outside the modification box 1, and its outlet end can selectively communicate with the modifier supply component 3. The airflow driving component 2 is used to drive the flow of the modifier airflow. The first modification air path includes a first modification inlet branch 300a and a first modification outlet branch 300b; the second modification air path includes a second modification inlet branch 400a and a second modification outlet branch 400b. The first modified air intake branch 300a and the second modified air intake branch 400a are both connected to the modifier supply component 3, the first modified air outlet branch 300b and the second modified air outlet branch 400b are both connected to the air inlet end of the airflow drive component 2, the first modified air intake branch 300a and the second modified air outlet branch 400b are both selectively connected to the first interface 12, and the second modified air intake branch 400a and the first modified air outlet branch 300b are both selectively connected to the second interface 13.

[0038] The modifier supply component 3 is provided with an air outlet 312 and an air inlet 311. The first modified air inlet branch 300a and the second modified air inlet branch 400a are both connected to the modifier supply component 3 through the air outlet 312.

[0039] The aerogel composite sheet 100 to be modified is placed inside the modification box 1, which provides a place for the aerogel composite sheet 100 to be modified.

[0040] When modifying the aerogel composite sheet 100, the first modification inlet branch 300a is connected to the first interface 12 of the modification box 1, and the first modification outlet branch 300b is connected to the second interface 13. The connection between the second modification inlet branch 400a and the second interface 13, and the connection between the second modification outlet branch 400b and the first interface 12 are then disconnected. This allows the atomized modifier output from the modifier supply component 3 to enter the modification box 1 from the first interface 12, and then output from the second interface 13 and return to the modifier supply component 3 via the airflow drive component 2. This creates a positive circulating airflow in the modification box 1. (Preset time) Afterwards, the connection between the first modified air intake branch 300a and the first interface 12 of the modified box 1 is cut off, and the connection between the first modified air outlet branch 300b and the second interface 13 is cut off. The second modified air intake branch 400a is connected to the second interface 13, and the second modified air outlet branch 400b is connected to the first interface 12, so as to switch the flow direction of the modifier airflow, so that the atomized modifier output from the modifier supply component 3 can enter the interior of the modified box 1 from the second interface 13, and then be output from the first interface 12 and flow back to the modifier supply component 3 through the airflow drive component 2, thereby making the modifier form a reverse circulation airflow in the modified box 1. This type of modification device features a first modified air inlet branch 300a and a second modified air outlet branch 400b, both of which are selectively connected to the first interface 12. It also features a second modified air inlet branch 400a and a first modified air outlet branch 300b, both of which are selectively connected to the second interface 13. With the cooperation of the modifier supply component 3 and the airflow drive component, the device can switch between the first and second modified air paths, allowing either the first or second modified air path to be selectively connected within the modification device. This allows the interface for the modifier to enter and exit the modification box 1 to be switched, enabling the modifier to circulate in both forward and reverse directions within the modification box 1. During these forward and reverse circulations, the modifier can be evenly distributed throughout the modification box 1, ensuring uniform contact between the modifier and the aerogel composite sheet 100 inside the modification box. This results in uniform modification of the aerogel composite sheet 100 within the modification box 1, effectively improving the modification consistency of the aerogel composite sheet 100.

[0041] In some embodiments, combined with Figure 1 and Figure 2The modification box 1 includes a box body 11, a first diversion plate assembly, and a second diversion plate assembly. A first interface 12 and a second interface 13 are provided on the box body 11. Both the first and second diversion plate assemblies are disposed within the box body 11. The first and second diversion plate assemblies are spaced apart along the axial direction of the modification box 1. The first diversion plate assembly is positioned near the first interface 12, and the second diversion plate assembly is positioned near the second interface 13. A receiving area is formed between the first and second diversion plate assemblies to receive the aerogel composite sheet 100 to be modified. Both the first and second diversion plate assemblies include a diversion baffle 14, which is connected to the box body 11. Multiple diversion holes are provided through the diversion baffle 14 along the axial direction of the modification box 1, and the multiple diversions on the same diversion baffle 14 are spaced apart. The housing 11 is made of 304 stainless steel. Inside the housing 11, a first diversion plate group and a second diversion plate group are arranged at intervals along the axial direction of the modification box 1. The first diversion plate group is close to the first interface 12 and the second diversion plate group is close to the second interface 13. After the modifier gas flow enters the housing 11 from the first interface 12, it can be dispersed by the first diversion plate group. After the gas flow enters the housing 11 from the second interface 13, it can be dispersed by the second diversion plate group. This helps to make the modifier evenly distributed in the containment area, thereby promoting the uniform contact between the modifier and the aerogel composite sheet 100 in the containment area.

[0042] Combination Figure 2 The first flow divider assembly includes at least two flow divider baffles 14, which are spaced apart along the axial direction of the modification box 1, and the flow divider holes on adjacent flow divider baffles 14 are staggered. The second flow divider assembly includes at least two flow divider baffles 14, which are spaced apart along the axial direction of the modification box 1, and the flow divider holes on adjacent flow divider baffles 14 are staggered.

[0043] The diameter of the diversion orifice is d, where 2mm ≥ d ≥ 10mm. In this example, d = 4mm.

[0044] At least two flow dividers 14 are provided in the same flow divider group. The staggered distribution of two adjacent flow dividers 14 in the same flow divider group can buffer the airflow and facilitate the dispersion of the airflow, so that the airflow is evenly distributed in various parts inside the box 11.

[0045] Of course, in actual implementation, the number of diversion baffles 14 in the first diversion plate group and the second diversion plate group can be flexibly adjusted according to the needs. For example, the number of diversion baffles 14 in the first diversion plate group can be set to one, two or more, and the number of diversion baffles 14 in the first diversion plate group can be set to one, two or more. Here, no specific limit is made on the number of diversion baffles 14 in the first diversion plate group and the second diversion plate group.

[0046] In some embodiments, combined with Figure 2 and Figure 3 The modification device also includes a support frame. The housing 11 is rotatably connected to the support frame 4 via a rotating shaft 17. The axis of the rotating shaft 17 is perpendicular to the axis of the modification housing 1, allowing the housing 11 to rotate around the axis of the rotating shaft 17. The modification housing 1 also includes a cover 16. A loading port is provided on the housing 11 between the first interface 12 and the second interface 13, and the cover 16 is used to seal the loading port. The housing 11 is rotatably connected to the support frame 4 via the rotating shaft 17, and the support frame 4 provides support for the housing 11. Since the axis of the rotating shaft 17 is perpendicular to the axis of the modification housing 1, flipping the housing 11 relative to the support frame 4 can adjust the positions of the first interface 12, the second interface 13, and the loading port on the horizontal plane. When it is necessary to load the aerogel composite sheet 100 into the modification box 1, the box body 11 is flipped to the loading position. With the box body 11 in the loading position, the axis of the rotating shaft 17 is horizontal, and the box body 11 is in a horizontal posture. At this time, the loading port faces the horizontal direction, facilitating the loading of the aerogel composite sheet 100. When it is necessary to modify the aerogel composite sheet 100, the box body 11 is flipped to the modification position. With the box body 11 in the modification position, the axis of the rotating shaft 17 is vertical, and the box body 11 is in a horizontal posture. 1 is set in a vertical position. The first interface 12 is located at the bottom of the box 11, and the second interface 13 is located at the top of the box 11. When the aerogel composite sheet 100 is modified, the second modification air inlet branch 400a inputs the modifier gas through the second interface 13. After the modifier gas enters the box 11, it is output from the first interface 12. During the flow of the modifier gas, the effect of gravity is used to reduce the airflow short-circuiting along the side wall of the box 11, thereby improving the uniformity of the contact between the modifier airflow and the surface of the aerogel composite sheet 100.

[0047] Specifically, the support 4 is rotatably connected to the housing 11 of the modification box 1 via a rotating shaft 17. The support 4 is provided with two spaced-apart bearing seats, and rotating shafts 17 are provided on opposite sides of the housing 11. The two rotating shafts 17 are rotatably connected to the two bearing seats respectively, so that the housing 11 can rotate smoothly and prevent the housing 11 from tilting.

[0048] In this example, the maximum rotation angle of the modification box 1 relative to the support 4 is set to 90°. Of course, in actual implementation, the maximum rotation angle of the modification box 1 relative to the support 4 can be flexibly adjusted as needed, and no limit is placed on the maximum rotation angle of the modification box 1 relative to the support 4 here.

[0049] In actual implementation, the modification device also includes a locking element for the modification box 1. This locking element secures the position of the modification box 1, preventing it from rotating arbitrarily and affecting its use. The locking element can be a pin or a fixing rope; after the modification box 1 is flipped into place, it is locked in place by the pin or rope. In other examples, the locking element can be other structures, such as a locking cylinder. The locking cylinder limits the position of the modification box 1, thereby locking its position. Any structure capable of locking the position of the modification box 1 is acceptable; no specific limitations are placed on the locking structure here.

[0050] The housing 11 also has two spare vents 15, which are arranged opposite each other. In this example, both the first port 12 and the second port 13 are greater than or equal to 50 mm. Optionally, the diameter of the two spare vents 15 can be smaller than the diameter of the first port 12 or the second port 13. During normal operation of the modification device, the two spare vents 15 are closed. When the aerogel composite sheet 100 inside the housing 11 shows poor modification, the spare vents 15 are opened to allow gas to enter, facilitating the investigation and analysis of the cause of the poor modification (confirming whether there is insufficient gas flow).

[0051] It is understandable that the aerogel composite sheet 100 requires a relatively high temperature during modification. In some embodiments, the airflow drive component 2 is equipped with a heating element. The modifier is heated by this heating element as it passes through the airflow drive component 2, causing it to vaporize. Furthermore, the high-temperature modifier carries heat into the modification chamber 1 as it passes through, providing heat for the modification process and ensuring its smooth execution. Of course, in other examples, a heating source can also be installed on the modification chamber 1 to heat it and provide heat for the modification.

[0052] The modification device also includes a modification valve 7, which includes a first modification valve 71, a second modification valve 72, a third modification valve 73, and a fourth modification valve 74. The first modification valve 71 is disposed on the first modified intake branch 300a, the second modification valve 72 is disposed on the first modified exhaust branch 300b, the third modification valve 73 is disposed on the second modified intake branch 400a, and the fourth modification valve 74 is disposed on the second modified exhaust branch 400b. When the first modified gas path needs to be connected to the modification device, the first modification valve 71 and the second modification valve 72 are opened, while the third modification valve 73 and the fourth modification valve 74 are kept closed. In this way, the modified agent supply component 3 outputs atomized modified agent, which can be input into the modification box 1 through the first modified air inlet branch 300a and the first interface 12 in sequence, and then output from the second interface 13 and transported to the modified agent supply component 3 through the first modified air outlet branch 300b, so that the modified agent forms a positive circulation flow in the modification box 1. When the second modified gas path needs to be connected to the modification device, the third modified valve 73 and the fourth modified valve 74 are opened, while the first modified valve 71 and the second modified valve 72 are kept closed. In this way, the modified agent supply component 3 outputs atomized modified agent, which can be input into the modification box 1 through the second modified air intake branch 400a and the second interface 13 in sequence, and then output from the first interface 12 and transported to the modified agent supply component 3 through the second modified air outlet branch 400b, so that the modified agent forms a reverse circulation flow in the modification box 1.

[0053] Combination Figure 1 The modification device also includes a third modifying gas path 700. The air outlet of the airflow drive component 2 is connected to the modifier supply component 3 through the third modifying gas path 700. The modification valve also includes a fifth modifying valve 75, which is disposed on the third modifying gas path 700. The third modifying gas path 700 in the modification device allows the airflow drive component 2 to connect to the modifier supply component 3 through the third modifying gas path 700, eliminating the need for direct connection between the airflow drive component 2 and the modifier supply component 3. The fifth modifying valve 75 on the third modifying gas path 700 facilitates control of its opening and closing. During modification, the fifth modifying valve 75 is opened, keeping the third modifying gas path 700 open. When the modifier supply component 3 has an air inlet 311, the third modifying gas path 700 is connected to the modifier supply component 3 through the air inlet 311.

[0054] Continue to combine Figure 1The modification device also includes a heater 6, a first residual gas path, a second residual gas path, an exhaust gas treatment unit 200, and a residual gas discharge valve 8. The air inlet of the heater 6 can be selectively connected to the air outlet of the airflow drive component 2. The first residual gas path includes a first residual gas inlet branch 500a and a first residual gas outlet branch 500b. The second residual gas path includes a second residual gas inlet branch 600a and a second residual gas outlet branch 60b. The residual gas discharge valve 8 includes a first residual gas discharge valve 81. The modification valve 7 also includes a fifth modification valve 75. The first residual gas discharge valve 81 and the fifth modification valve 75 are both located on the air inlet of the airflow drive component 2. The sixth modification valve 76 is located on the air outlet of the airflow drive component 2. Specifically, the first residual air inlet branch 500a and the second residual air inlet branch 600a are selectively connected to the air outlet of the heater 6; the first residual air outlet branch 500b and the second residual air outlet branch 600b are both connected to the waste gas treatment unit 200; the first residual air inlet branch 500a and the second residual air outlet branch 600b are selectively connected to the first interface 12; and the first residual air outlet branch 500b and the second residual air inlet branch 600a are selectively connected to the second interface 13. It is understood that after the aerogel composite sheet 100 is modified, the waste gas and residual solvent inside the modification box 1 need to be removed. A fifth modification valve 75 and a first residual discharge valve 81 are provided at the air inlet end of the airflow drive component 2, and a sixth modification valve 76 is provided at the air outlet end of the airflow drive component 2. When residual discharge operation is required, the fifth modification valve 75 and the sixth modification valve 76 are kept closed, so that both the first and second modified gas paths are disconnected from the airflow drive component 2, and the first residual discharge valve 81 is kept open, so that the residual gas can enter the airflow drive component 2 from the first residual discharge valve 81. In this example, the residual gas is air. The first residual discharge inlet branch 500a and the second residual discharge inlet branch 600a are selectively connected to the air outlet end of the heater 6, and the first residual discharge outlet branch 500b and the second residual discharge outlet branch 600b are both connected to the waste gas treatment unit 200, so that the first residual gas path and the second residual gas path can be selectively connected to the modification device.Specifically, when the first residual gas path is connected to the modification device, the first residual gas inlet branch 500a is connected to the heater 6, and the first residual gas outlet branch 500b is connected to the exhaust gas treatment unit 200. Meanwhile, the second residual gas inlet branch 600a is kept disconnected from the heater 6, and the second residual gas outlet branch 600b is kept disconnected from the exhaust gas treatment unit 200. This disconnects the second residual gas path within the modification device. At this time, the residual gas can enter the airflow drive component 2 from the first residual gas valve 81, and sequentially pass through the heater 6, the first residual gas inlet branch 500a, and the first interface 12 into the modification box 1. It is then discharged from the second interface 13 and discharged through the first residual gas outlet branch 500b to the exhaust gas treatment unit 200, allowing the residual gas to form a positive gas flow inside the modification box 1. In the modified device, when the second residual gas path is connected, the second residual gas inlet branch 600a is connected to the heater 6, and the second residual gas outlet branch 600b is connected to the exhaust gas treatment unit 200. The first residual gas inlet branch 500a is kept disconnected from the heater 6 and the first residual gas outlet branch 500b is kept disconnected from the exhaust gas treatment unit 200, so that the first residual gas path is disconnected in the modified device. At this time, external air can enter the airflow drive component 2 from the first residual valve 81, and enter the modified box 1 through the heater 6, the second residual gas inlet branch 600a and the second interface 13 in sequence. It is discharged from the first interface 12 and discharged to the exhaust gas treatment unit 200 through the second residual gas outlet branch 600b, so that the residual gas can form a reverse airflow inside the modified box 1. By allowing forward and reverse airflows to flow inside the modification chamber 1, the external air is evenly distributed inside the modification chamber 1, which helps to remove odors and residues inside the modification chamber 1, thereby helping to reduce solvent residue.

[0055] It should be noted that the residual gas is not limited to air; it can also be other gases, such as inert gases.

[0056] In this example, the principle of waste gas treatment unit 200 is based on a combination of activated carbon adsorption and catalytic combustion. Of course, in actual implementation, the principle of waste gas treatment unit 200 can be flexibly adjusted as needed.

[0057] The modification device also includes a residual discharge valve component 8, which includes a second residual discharge valve 82, a third residual discharge valve 83, a fourth residual discharge valve 84, and a fifth residual discharge valve 85. The first residual discharge valve 81 is installed on the first residual discharge inlet branch 500a, the second residual discharge valve 82 is installed on the outlet branch of the first residual discharge valve 81, the third residual discharge valve 83 is installed on the second residual discharge inlet branch 600a, and the fourth residual discharge valve 84 is installed on the second residual discharge outlet branch 600b. By controlling the opening and closing of the above residual discharge valves, it is convenient to control the on / off of the residual discharge inlet branch and the residual discharge outlet branch.

[0058] The modification device also includes a third residual gas passage 800. The air outlet of the airflow drive component 2 is connected to the air inlet of the heater 6 through the third residual gas passage 800. The residual gas discharge valve component 8 also includes a sixth residual gas discharge valve 86, which is located on the air outlet of the airflow drive component 2. When it is necessary to perform residual gas discharge operation on the modification device, the sixth modification valve 76 is closed and the sixth residual gas discharge valve 86 is opened, so that the residual gas can be output from the air outlet of the airflow drive component 2 and delivered to the heater 6 through the third residual gas passage 800.

[0059] In this example, the airflow drive component 2 is a high-pressure vortex blower. The high-pressure vortex blower is explosion-proof and has an energy efficiency of not less than level 2. The air inlet of the high-pressure vortex blower can be accelerated by the impeller rotation, and the modifier airflow is accelerated inside the high-pressure vortex blower to form a high-speed airflow. The high-speed airflow is discharged from the air outlet of the high-pressure vortex blower. The high-speed airflow formed by the high-pressure vortex blower passes through the air inlet 311 of the modifier supply component 3 and enters the bottom of the modifier supply component 3. During the process of the high-speed airflow entering the modifier supply component 3, it blows up and atomizes the modifier inside. The atomized modifier is sprayed out through the air outlet 312 of the modifier supply component 3 and enters the modification box 1. At the same time, the air inlet of the high-pressure vortex blower forms a negative pressure through the impeller rotation. The negative pressure back suction function causes the unreacted modifier gas in the modification box 1 to flow back to the modifier supply component 3 through the high-pressure vortex blower, realizing the recycling of the modifier. Among them, the high-pressure vortex blower can generate a certain amount of heat, which can make the airflow temperature in the circulation pipe reach 50℃~80℃, which can be used for auxiliary modification. In this way, there is no need to set up a separate heating system for auxiliary modification.

[0060] In other examples, the airflow driving component 2 can also be other; for example, the airflow driving component 2 can also be an airflow generating component.

[0061] In this example, the first residual discharge valve 81, the second residual discharge valve 82, the third residual discharge valve 83, the fourth residual discharge valve 84, the fifth residual discharge valve 85, and the sixth residual discharge valve 86 are all temperature-resistant and corrosion-resistant pneumatic ball valves. The first modified valve 71, the second modified valve 72, the third modified valve 73, the fourth modified valve 74, the fifth modified valve 75, and the sixth modified valve 76 are all temperature-resistant and corrosion-resistant pneumatic ball valves.

[0062] Combination Figure 1 The heater 6 is equipped with a first temperature detector 9, which can detect the heating temperature of the heater 6. The air outlet of the heater 6 is equipped with a second temperature detector 10, which can detect the temperature of the air input into the modification box 1.

[0063] The modifier supply component 3 includes an atomizing tank 31, a feeding pump 32, and a weighing tank 33 connected sequentially by pipes. Both the air outlet 312 and the air inlet 311 are located on the atomizing tank 31. The atomizing tank 31 has internal packing material and a DN25 safety valve at the top. The atomizing tank 31 atomizes the modifier. The packing material is a standard component and can be made of metal, ceramic, or plastic, allowing for various selections. Adding packing material improves the atomization effect of the modifier discharged from the modifier supply component 3. The packing material acts as a barrier, allowing airflow to pass smoothly while blocking liquid. It is understandable that if the modifier is fed too quickly, it will affect the atomization effect of the atomizing tank 31, and the liquid modifier may damage the surface of the aerogel composite sheet 100 during modification. If the modifier is fed too slowly, a longer modification time is required, affecting production efficiency. With the cooperation of the feed pump 32 and the weighing tank 33, a set amount of modifier can be added to the atomizing tank 31 at a set rate.

[0064] Combination Figure 4 The modification device also includes a suspended basket 5, which can be selectively installed inside the housing 11. The suspended basket 5 has air permeability and load-bearing capacity, and is used to support the aerogel composite sheet 100 to be modified. In actual use, the aerogel composite sheet 100 to be modified is installed inside the housing 11 via the suspended basket 5. Specifically, the suspended basket 5 includes a main body 51 and air-permeable supports 52. The main body 51 is a hollow structural component, and the main body 51 is a porous 304 stainless steel component, that is, air holes are provided at the bottom and side walls of the main body 51. There are multiple air-permeable supports 52, all of which are installed inside the main body 51. The multiple air-permeable supports 52 are distributed sequentially and spaced apart along the direction from the bottom to the top of the main body 51. There are receiving portions for accommodating the aerogel composite sheet 100 between two adjacent air-permeable supports 52 and between the air-permeable supports 52 and the bottom of the main body 51. In this embodiment, the breathable support 52 is a woven mesh. The breathable support 52 with the woven mesh structure has good breathability, which is beneficial to the contact between the modifier and the aerogel composite sheet 100.

[0065] The housing 11 has conical structures at both axial ends. The first interface 12 and the second interface 13 are both located on these conical structures, and the flow dividers 14 are located within them, with their edges abutting against the inner wall of the housing 11. By placing the first interface 12 and the second interface 13 on the conical structures at both ends of the housing 11, the modifier gas flow, after entering through either the first interface 12 or the second interface 13, is buffered inside the conical structures and passes through the flow dividers 14 within the conical structures, which is more conducive to the uniform dispersion of the modifier gas flow.

[0066] In some embodiments, a method for modifying an aerogel composite sheet 100 (hereinafter referred to as the modification method) is also provided, wherein the modification method includes the modification apparatus of any of the above embodiments. This modification method includes the following steps:

[0067] Aerogel composite sheet 100 is loaded into the modification box 1. Modifier supply component 3 outputs atomized modifier. The modifier enters the modification box 1 from the first modification inlet branch 300a, and then exits from the first modification outlet branch 300b, passes through the airflow drive component 2, and flows back to the modifier supply component 3, so that the modifier forms a positive circulation flow in the modification box 1. After a preset time, the airflow direction of the modifier is switched so that the modifier enters the modification box 1 from the second modification inlet branch 400a, and then exits from the second modification outlet branch 400b, passes through the airflow drive component 2, and flows back to the modifier supply component 3, forming a reverse circulation flow.

[0068] During modification, all residual discharge valves are closed. Before the modifier is fed into the modification chamber 1 from the first port 12 during the positive circulation process of the modifier, the third modification valve 73 and the fourth modification valve 74 are closed, while the first modification valve 71, the second modification valve 72, the fifth modification valve 75, and the sixth modification valve 76 remain open. This allows the modifier, after being discharged from the modifier supply component 3, to enter the modification chamber 1 from the first port 12 via the first modification inlet branch 300a, and then be discharged from the second port 13. It then passes sequentially through the first modification outlet branch 300b and the airflow drive component 2, before flowing back to the modifier supply component 3. While flowing inside the modification chamber 1, the modifier contacts the aerogel composite sheet 100 inside the modification chamber 1. During the reverse circulation process of the modifier, before the modifier is fed into the modification box 1 from the second port 13, the first modification valve 71 and the second modification valve 72 are closed, while the third modification valve 73, the fourth modification valve 74, the fifth modification valve 75 and the sixth modification valve 76 are kept open. This allows the modifier to enter the modification box 1 from the second port 13 after being output from the modifier supply component 3, through the second modification air intake branch 400a, and then be discharged from the first port 12, through the second modification air outlet branch 400b and the airflow drive component 2, and then flow back to the modifier supply component 3. When the modifier flows in the modification box 1, it comes into contact with the aerogel composite sheet 100 inside the modification box 1 and undergoes a modification reaction.

[0069] In this modification method, during modification, a modifier that flows in a forward circulation and a modifier that flows in a reverse circulation are introduced into the modification box 1, so that the modifier is evenly distributed in every corner of the modification box 1, thereby making the aerogel composite sheet 100 uniformly modified inside the modification box 1, resulting in good modification consistency of the aerogel composite sheet 100.

[0070] In one example, the duration for which the modifier is kept in forward circulation within modification chamber 1 is t1, and the duration for which it is kept in reverse circulation within modification chamber 1 is t2, where t1 = t2. This design ensures that the forward and reverse circulation times of the modifier during modification are the same, further improving the uniformity of the modifier's distribution within modification chamber 1. 10 min ≥ t1 ≥ 60 min, 10 min ≥ t2 ≥ 60 min. Of course, in actual implementation, the duration for which the modifier is kept in forward circulation within modification chamber 1 (t1) and the duration for which it is kept in reverse circulation within modification chamber 1 (t2) can be set as needed; no specific limitations are imposed on t1 and t2 here.

[0071] The number of times the modifier circulates forward in modification chamber 1 and the number of times the modifier circulates backward in modification chamber 1 can be adjusted as needed.

[0072] For example, the modifier is set to circulate forward twice and reverse twice in modification chamber 1. Specifically, the modifier is first circulated forward in modification chamber 1 for 20 minutes. Then, the airflow direction of the modifier is switched to circulate reversely in modification chamber 1 for 20 minutes. This process is repeated, and finally, the airflow drive component 2 stops operating. By repeatedly adjusting the flow direction of the modifier in modification chamber 1, the speed at which the modifier is evenly distributed inside modification chamber 1 can be accelerated, which helps to shorten the modification time and improve the uniformity of the modifier's distribution inside modification chamber 1. Specifically, the first modification valve 71, the second modification valve 72, the fifth modification valve 75, and the sixth modification valve 76 are all kept open, the third modification valve 73 and the fourth modification valve 74 are closed, and the airflow drive component 2 and the feed pump 32 are run for 20 minutes to allow the modifier to circulate in the modification tank 1 in a forward direction for 20 minutes. Then, the airflow drive component 2 and the feed pump 32 are paused, the third modification valve 73, the fourth modification valve 74, the fifth modification valve 75, and the sixth modification valve 76 are all kept open, the first modification valve 71 and the second modification valve 72 are closed, and the airflow drive component 2 and the feed pump 32 are restarted to allow the modifier to circulate in the modification tank 1 in a reverse direction for 20 minutes. Then, the above steps are repeated once.

[0073] In actual implementation, the modification device includes a main controller and an alarm. The main controller can control the operation of each modification valve and each residue discharge valve. The main controller is communicatively connected to the feeding pump 32 and the weighing tank 33. Before modification, parameters such as modification time, total modifier dosage, and feeding pump 32 speed are preset via the main controller. After starting the airflow drive component 2 and the feeding pump 32, modification begins. During modification, the main controller controls the relevant components according to the preset parameters. Once the modification time is reached, an alarm is automatically triggered, the airflow drive component 2 and the feeding pump 32 are shut down, and the device switches to residue discharge mode for residue discharge. The residue discharge mode can be switched manually or automatically.

[0074] Optionally, before the modifier enters the modifying tank 1, the modification method further includes a loading operation, which includes the following steps:

[0075] Multiple aerogel composite sheets 100 are loaded into the hanging basket 5, and then the hanging basket 5 is assembled into the modified box 1;

[0076] In the suspended platform 5, multiple aerogel composite sheets 100 are stacked sequentially, and a breathable support 52 is laid between two adjacent aerogel composite sheets.

[0077] A breathable support 52 is laid between two aerogel composite sheets 100. The breathable support 52 can separate the two adjacent aerogel composite sheets 100, so as to avoid the two aerogel composite sheets 100 overlapping and failing to fully contact the modifier airflow.

[0078] In this example, the breathable support 52 is a woven mesh, which has good air permeability. It should be noted that the breathable support 52 is not limited to woven mesh, but can also be other structures.

[0079] Optionally, before loading, the modification box 1 is adjusted to a first posture to make its axial direction horizontal. During modification, the modification box 1 is adjusted to a second posture to make its axial direction vertical. The first posture refers to the modification box 1 being set in a horizontal position; the second posture refers to the modification box 1 being set in a vertical position. Before loading, the modification box 1 is adjusted to a first position, so that the loading port faces the horizontal direction to facilitate loading of the aerogel composite sheet 100. During modification, the modification box 1 is adjusted to a second position. For the modification box 1 in the second position, the first interface 12 is located at the bottom of the box body 11, and the second interface 13 is located at the top of the box body 11. During the modification of the aerogel composite sheet 100, the second modification air inlet branch 400a inputs the modifier gas through the second interface 13. After the modifier gas enters the box body 11, it is output from the first interface 12. During the flow of the modifier gas, gravity is used to reduce the airflow short-circuiting along the side wall of the box body 11, thereby improving the uniformity of contact between the modifier gas and the surface of the aerogel composite sheet 100.

[0080] In some embodiments, the modification method further includes a residue removal operation, which includes the following steps: heating the residue gas and feeding it into the modification chamber 1 from the first interface 12 via the first residue inlet branch 500a, then outputting it from the second interface 13 and conveying it to the waste gas treatment unit 200 via the first residue outlet branch 500b, so that the residue gas flows forward within the modification chamber 1; heating the residue gas and feeding it into the modification chamber 1 from the second interface 13 via the second residue inlet branch 600a, then outputting it from the first interface 12 and conveying it to the waste gas treatment unit 200 via the second residue outlet branch 600b, so that the residue gas flows backward within the modification chamber 1. In this embodiment, the residue gas is air. In other embodiments, the residue gas can also be other gases, such as inert gases. During the residue removal operation, the order in which the residue gas enters the modification chamber 1 can be flexibly changed according to actual needs. That is, the heated exhaust gas can be first fed into the modification box 1 through the first interface 12 and then output to the exhaust gas treatment unit 200 through the second interface 13. After a set time, the heated exhaust gas can be fed into the modification box 1 through the second interface 13 and then output to the exhaust gas treatment unit 200 through the first interface 12. Alternatively, the heated exhaust gas can be first fed into the modification box 1 through the second interface 13 and then output to the exhaust gas treatment unit 200 through the first interface 12. After a certain period of time, the heated exhaust gas can be fed into the modification box 1 through the first interface 12 and then output to the exhaust gas treatment unit 200 through the second interface 13.

[0081] It is important to note that during the residue removal operation, all modification valves should be closed to ensure that all modification valves remain in the closed state.

[0082] In actual operation, the number of times the residual gas flows forward and backward inside the modification chamber 1 can be flexibly adjusted as needed. For example, the number of times the residual gas flows forward inside the modification chamber 1 can be one, two, or more times; similarly, the number of times the residual gas flows backward inside the modification chamber 1 can be one, two, or more times. The duration of the forward and reverse flow of the residual gas inside the modification chamber 1 can also be set as needed.

[0083] In some embodiments, the residual gas is set to flow forward and backward once inside the modification chamber 1. First, the fourth and fifth residual gas discharge valves 84 and 85 are closed. Then, the first, second, third, and sixth residual gas discharge valves 81, 82, 83, and 86 are kept open. The airflow drive component 2 and heater 6 are started and operated for at least 30 minutes. Then, the airflow drive component 2 and heater 6 are stopped, the second and third residual gas discharge valves 82 and 83 are closed, and the fourth and fifth residual gas discharge valves 84 and 85 are opened. Then, the airflow drive component 2 and heater 6 are restarted. By switching the discharge valves, the residual substances in the modification chamber 1 can be effectively removed.

[0084] In actual implementation, the duration of residue removal, the switching of the residue removal valve, and the operation of the airflow drive component 2 and the heater 6 can all be controlled by the main controller. After the residue removal is completed, an alarm signal is issued and the heater 6 and the airflow drive component 2 are turned off, and the modification device automatically enters the unloading mode.

[0085] Before performing the residue removal operation, the heating temperature of heater 6 should be set. The heating temperature of heater 6 should not exceed 120℃. If the temperature is too high, the modification chamber 1 may explode. The temperature of heater 6 is T1, and the temperature detected by the second temperature detector 10 is T2. Under normal circumstances, T2 ≤ T1. If T2 > T1, it indicates that there is an abnormality in heater 6.

[0086] In actual operation, turn on the airflow drive component 2 first, then turn on the heater 6; turn off the heater 6 first, then turn off the airflow drive component 2. When the pressure in the atomizing tank 31 exceeds the set threshold, an alarm will sound, and the heater 6, the hot airflow drive component 2, and the feed pump 32 will be shut down in conjunction.

[0087] In some embodiments, during modification: the total modification time is set to 60 minutes, the amount of modifier is 5 kg, and the modification valve is switched every 15 minutes; during residue removal operation: the total running time of the airflow drive component 2 is 40 minutes, the temperature detected by the first temperature detector 9 is 80°C, the temperature detected by the second temperature detector 10 is 100°C, and the residue removal valve is switched every 20 minutes.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A device for modifying aerogel composite sheets, characterized in that, include: A modified box, wherein the modified box has a first interface and a second interface, the first interface and the second interface being arranged opposite to each other in the axial direction of the modified box; A modifier supply component capable of outputting atomized modifier; An airflow driving component, wherein the air outlet of the airflow driving component can be selectively connected to the modifier supply component, and the airflow driving component is used to drive the flow of modifier airflow; The first modified gas path includes a first modified intake branch and a first modified exhaust branch; and The second modified gas path includes a second modified intake branch and a second modified exhaust branch; The first modified air intake branch and the second modified air intake branch are both connected to the modifier supply component, the first modified air outlet branch and the second modified air outlet branch are both connected to the air inlet end of the airflow drive component, the first modified air intake branch and the second modified air outlet branch are both selectively connected to the first interface, and the second modified air intake branch and the first modified air outlet branch are both selectively connected to the second interface.

2. The device for modifying aerogel composite sheets according to claim 1, characterized in that, The modification box includes a box body, a first diversion plate group, and a second diversion plate group. The box body has a first interface and a second interface. The first diversion plate group and the second diversion plate group are both disposed inside the box body. The first diversion plate group and the second diversion plate group are distributed at intervals along the axial direction of the modification box. The first diversion plate group is disposed near the first interface, and the second diversion plate group is disposed near the second interface. A receiving area is formed between the first diversion plate group and the second diversion plate group. The receiving area is used to accommodate the aerogel composite sheet to be modified. The first diversion plate group and the second diversion plate group both include a diversion baffle. The diversion baffle is connected to the box body, and the diversion baffle has multiple diversion holes that penetrate along the axial direction of the modification box. The multiple diversion holes on the same diversion baffle are distributed at intervals.

3. The device for modifying aerogel composite sheets according to claim 2, characterized in that, The first diversion plate group includes at least two diversion baffles, the at least two diversion baffles in the first diversion plate group are distributed at intervals along the axial direction of the modified box, and the diversion holes on two adjacent diversion baffles in the first diversion plate group are staggered. And / or, the second diversion plate group includes at least two diversion baffles, the at least two diversion baffles in the second diversion plate group are distributed at intervals along the axial direction of the modified box, and the diversion holes on two adjacent diversion baffles in the second diversion plate group are staggered.

4. The device for modifying aerogel composite sheets according to claim 2, characterized in that, It also includes a support, and the box body is rotatably connected to the support via a rotating shaft. The axis of the rotating shaft is perpendicular to the axis of the modified box, and the box body can rotate around the axis of the rotating shaft. The modified box also includes a cover, and the box body has a loading port located between the first interface and the second interface. The cover is used to seal the loading port.

5. The device for modifying aerogel composite sheets according to claim 1, characterized in that, It also includes modified valve components, which include a first modified valve, a second modified valve, a third modified valve and a fourth modified valve. The first modified valve is disposed on the first modified intake branch, the second modified valve is disposed on the first modified outlet branch, the third modified valve is disposed on the second modified intake branch, and the fourth modified valve is disposed on the second modified outlet branch.

6. The device for modifying aerogel composite sheets according to claim 5, characterized in that, It also includes a heater, a first exhaust gas path, a second exhaust gas path, an exhaust gas treatment unit, and an exhaust valve. The air inlet of the heater is selectively connected to the air outlet of the airflow drive component. The first exhaust gas path includes a first exhaust gas inlet branch and a first exhaust gas outlet branch. The second exhaust gas path includes a second exhaust gas inlet branch and a second exhaust gas outlet branch. The exhaust valve includes a first exhaust valve. The modified valve also includes a fifth modified valve and a sixth modified valve. The first exhaust valve and the fifth modified valve are both located on the air inlet of the airflow drive component, and the sixth modified valve is located on the air outlet of the airflow drive component. The first and second residual air intake branches are selectively connected to the air outlet of the heater, the first and second residual air outlet branches are connected to the waste gas treatment unit, the first and second residual air intake branches are selectively connected to the first interface, and the first and second residual air intake branches are selectively connected to the second interface.

7. The apparatus for modifying aerogel composite sheets according to claim 6, characterized in that, It also includes a residual discharge valve, which includes a second residual discharge valve, a third residual discharge valve, a fourth residual discharge valve and a fifth residual discharge valve. The second residual discharge valve is disposed on the first residual discharge inlet branch, the third residual discharge valve is disposed on the first residual discharge outlet branch, the fourth residual discharge valve is disposed on the second residual discharge inlet branch, and the fifth residual discharge valve is disposed on the second residual discharge outlet branch.

8. A method for modifying an aerogel composite sheet, characterized in that, A modification apparatus according to any one of claims 1 to 7 is provided, comprising the following steps: loading an aerogel composite sheet into the modification chamber; outputting an atomized modifier from a modifier supply component; the modifier entering the interior of the modification chamber from a first modification inlet branch, then exiting from the first modification outlet branch and flowing back to the modifier supply component via the airflow drive component, thereby forming a positive circulation flow of the modifier in the modification chamber; after a predetermined time, switching the airflow direction of the modifier so that the modifier enters the interior of the modification chamber from a second modification inlet branch, then exiting from the second modification outlet branch and flowing back to the modifier supply component via the airflow drive component, thereby forming a reverse circulation flow of the modifier in the modification chamber.

9. The method for modifying the aerogel composite sheet according to claim 8, characterized in that, The duration for which the modifier is kept in forward circulation in the modification box is t1, and the duration for which the modifier is kept in reverse circulation in the modification box is t2, where t1 = t2.

10. The method for modifying the aerogel composite sheet according to claim 8, characterized in that, It also includes a residue removal operation, which includes the following steps: The heated exhaust gas is fed into the modified box from the first interface through the first exhaust gas inlet branch, and output from the second interface and transported to the waste gas treatment unit through the first exhaust gas outlet branch, so that the exhaust gas flows in the positive direction inside the modified box. The heated exhaust gas is fed into the modified box through the second interface via the second exhaust gas inlet branch, and then output from the first interface and transported to the waste gas treatment unit via the second exhaust gas outlet branch, so that the exhaust gas flows in reverse inside the modified box.

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