Method for preparing a multilayer aerogel mat and a gluing device therefor

Abstract

This invention relates to a method for preparing multilayer aerogel felt and its coating apparatus, comprising the following steps: S1: adding hot melt adhesive liquid to the coating apparatus, the coating apparatus including a coating roller and an adhesive tank, the adhesive tank being used to hold the hot melt adhesive liquid, and the coating roller being partially immersed in the adhesive tank; S2: unwinding a first felt body through a first feeding mechanism, passing the first felt body through the gap between the adhesive amount adjustment component and the coating component, and rolling the first felt body with the coating roller to prepare a pre-coated felt; S3: bonding the pre-coated felt prepared in step S2 with a second felt body conveyed by a second feeding mechanism to prepare a composite felt; S4: cooling and curing the composite felt in step S3 to obtain the final product; the composite felt is cooled at room temperature, causing the hot melt adhesive between the first and second felt bodies to condense and solidify, eliminating the need to heat the aerogel felt to achieve adhesive curing, avoiding thermal damage to the composite felt, and ensuring that the composite felt has better thermal insulation performance.

Description

Technical Field

[0001] This invention belongs to the field of felt processing and production technology, and particularly relates to a method for preparing multilayer aerogel felt and its coating device. Background Technology

[0002] Aerogel felt is a felt structure formed by combining aerogel liquid with fiber felt. Because aerogel felt has excellent thermal insulation properties, high temperature resistance and does not produce harmful gases, aerogel felt products are used as high-efficiency thermal insulation materials in many fields such as new energy vehicles, home appliances, and smart electronic products.

[0003] Aerogel coating and stacking: In the process of preparing multi-layer aerogel mats, the aerogel mats are coated with adhesive, so that the layers of aerogel mats are bonded and stacked to prepare aerogel mats of the required thickness.

[0004] Currently, in production applications, thermosetting adhesives are frequently used for coating aerogel mats. This involves applying the adhesive liquid to the aerogel sheets, then heating the layers to accelerate curing and achieve bonding between the aerogel mat layers. However, because aerogel mats have excellent thermal insulation properties, the curing process of the adhesive liquid is slow due to heating, resulting in a slower bonding rate between the aerogel mat layers and affecting the preparation rate. Furthermore, heating can cause thermal damage to the aerogel sheets, affecting the thermal insulation performance of the prepared multilayer aerogel mats. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method for preparing multilayer aerogel mats to solve the problem that heating aerogel mats to cure the adhesive will cause thermal damage to the aerogel sheets in the prior art. The present invention also provides an adhesive coating device for preparing multilayer aerogel mats.

[0006] Firstly, to achieve the above objectives, this invention discloses a method for preparing multilayer aerogel mats, the technical solution of which is:

[0007] A method for preparing a multilayer aerogel mat includes the following steps:

[0008] S1: Add hot melt adhesive liquid to the adhesive applicator. The adhesive applicator includes an adhesive applicator roller and an adhesive tank. The adhesive tank is used to hold the hot melt adhesive liquid, and the adhesive applicator roller is partially immersed in the adhesive tank.

[0009] S2: The adhesive coating device also includes a first feeding mechanism, an adhesive quantity adjustment component and an adhesive coating component. The first feeding mechanism unwinds the first felt body, and the first felt body passes through the gap between the adhesive quantity adjustment component and the adhesive coating component. The adhesive coating roller coats the first felt body to prepare a pre-coated felt.

[0010] S3: The pre-coated felt prepared in step S2 is bonded to the second felt body conveyed by the second feeding mechanism in the adhesive coating device to prepare a composite felt.

[0011] S4: Cool and solidify the composite felt from step S3 to obtain the final product.

[0012] Beneficial effects: In the production process of multi-layer stacked thermal insulation felt, by using hot melt adhesive, which cures upon cooling, after the layers of adhesive are stacked, there is no need to heat the stacked aerogel felt. The bonding and stacking of the layers of aerogel felt can be achieved by simply allowing them to cool. Therefore, the stacking and bonding rate of the layers of aerogel felt is faster and the process is simpler. On the other hand, the aerogel felt does not need to be heated, which results in a slower curing of the adhesive due to the thermal insulation properties of the aerogel felt, and also reduces the thermal damage to the thermal insulation pad caused by heating and curing.

[0013] Furthermore, in step S2, the thickness of the adhesive applied to the first felt body by the roller is 0.02-0.2 mm; in step S4, the cooling and curing time is 1-2 min.

[0014] Beneficial effects: By adjusting the curing time and adhesive thickness, the adhesive thickness has a significant impact on the thermal insulation performance of the composite felt. When the adhesive thickness is too thick, the adhesive has good heat transfer properties, which will affect the thermal insulation performance of the finished product. However, when the adhesive thickness is too thin, the internal bonding performance of the composite felt is poor, the stability of the composite felt is poor, and it will affect subsequent use. Therefore, the choice of adhesive thickness has a critical impact on the thermal insulation performance of the composite felt. Both the curing time and the adhesive thickness will affect the bonding between the first and second felt bodies, reducing the possibility of stringing due to too short a curing time, while too long a curing time will affect production efficiency.

[0015] Secondly, this application provides a multilayer aerogel felt preparation apparatus, comprising the following scheme:

[0016] A coating apparatus for use in conjunction with a method for preparing multilayer aerogel mats, the coating apparatus comprising:

[0017] The first feeding mechanism is configured to transfer the first felt body;

[0018] The glue-applying mechanism, located near the first feeding mechanism, is used to apply glue to one side of the first felt body; and

[0019] The second feeding mechanism is located on the side of the adhesive coating mechanism away from the first feeding mechanism. The second feeding mechanism is used to convey the second felt body and to cover the adhesive-coated side of the first felt body, thus obtaining a composite felt; wherein...

[0020] The glue application mechanism includes a frame, a glue application assembly, a glue supply assembly, and a glue quantity adjustment assembly;

[0021] The glue application assembly, glue supply assembly, and glue quantity adjustment assembly are respectively mounted on the frame;

[0022] The adhesive supply assembly contains molten hot melt adhesive;

[0023] A gap is formed between the adhesive amount adjustment component and the adhesive application component to allow the first felt to pass through. The size of the gap is adjustable to adjust the thickness of the hot melt adhesive layer applied to the first felt.

[0024] Beneficial effects: In this invention, a first feeding mechanism conveys a first felt body, which then passes through an adhesive coating mechanism to coat one side of the first felt body with hot melt adhesive. A second feeding mechanism conveys a second felt body, which covers the adhesive-coated side of the first felt body, resulting in a composite felt. The composite felt is cooled at room temperature, causing the hot melt adhesive between the first and second felt bodies to solidify. This eliminates the need to heat the aerogel felt to solidify the adhesive, avoiding thermal damage to the composite felt and ensuring excellent thermal insulation performance. The adhesive coating mechanism includes an adhesive quantity adjustment component, forming a gap between the adhesive quantity adjustment component and the adhesive coating component for the first felt body to pass through. The size of the gap is adjustable, facilitating the adjustment of the hot melt adhesive thickness coated on the first felt body and preventing hot melt adhesive waste.

[0025] Furthermore, the glue supply assembly includes a glue tank fixedly disposed relative to the frame, and the glue application assembly includes a glue application roller rotatably disposed relative to the frame, with the bottom of the glue application roller immersed in the hot melt glue in the glue tank.

[0026] Beneficial effect: Rotating the coating roller facilitates the adhesion of hot melt adhesive in the glue tank to the coating roller, allowing the coating roller to transfer the hot melt adhesive onto the first felt body it passes through.

[0027] Furthermore, the adhesive quantity adjustment assembly includes a mounting shell fixed on the frame, and the mounting shell is provided with a first receiving cavity and a second receiving cavity that are adjacent to each other front and rear.

[0028] The first receiving cavity is equipped with a first scraper that is guided vertically in the first receiving cavity, and the bottom of the first receiving cavity is provided with a first opening for the first scraper to extend out.

[0029] The second cavity is equipped with a second scraper that is guided vertically, and the bottom of the second cavity has a second opening for the second scraper to extend out.

[0030] The mounting housing is provided with a locking structure, which includes a first state in which the first scraper is kept extending out of the first opening and the second scraper is kept inserted into the second receiving cavity, and a second state in which the first scraper is kept inserted into the first receiving cavity and the second scraper is kept extending out of the second opening.

[0031] The first scraper and the second scraper have different lengths, and the gap formed between the first scraper and the coating roller after the first scraper extends out of the mounting housing is different from the gap formed between the second scraper and the coating roller after the second scraper extends out of the mounting housing.

[0032] Beneficial effects: A first scraper extends from the adhesive amount adjustment component, which can form a gap between itself and the adhesive roller to allow the first felt to pass through; a second scraper extends, which can also form a gap between itself and the adhesive roller to allow the first felt to pass through. Since the first and second scrapers are of different lengths, the gaps formed between the first scraper and the adhesive roller are different from those formed between the second scraper and the adhesive roller, thereby facilitating the adjustment of the thickness of the adhesive layer covering one side of the first felt.

[0033] Furthermore, the first scraper includes a first blade body and a first button fixed on the first blade body. The first blade body is provided with a first protrusion adapted to slide along the first receiving cavity. A first limiting block is fixed in the first receiving cavity. The first protrusion is located above the first limiting block. A first elastic telescopic structure is provided between the first protrusion and the first limiting block. The second scraper includes a second blade body and a second button fixed on the second blade body. The second blade body is provided with a second protrusion adapted to slide along the second receiving cavity. A second limiting block is fixed in the second receiving cavity. The second protrusion is located above the second limiting block. A second elastic telescopic structure is provided between the second protrusion and the second limiting block.

[0034] Beneficial effects: The design of the first and second buttons facilitates downward pressing of the first and second scrapers, and the design of the first and second elastic telescopic structures facilitates the reset of the first and second scrapers.

[0035] Furthermore, the locking structure includes a locking plate that is slidably guided relative to the mounting shell, and the locking plate is provided with a first locking hole and a second locking hole respectively. A first locking tongue corresponding to the first locking hole is fixed on the first button, and a second locking tongue corresponding to the second locking hole is fixed on the second button.

[0036] Beneficial effects: The locking structure, through the back-and-forth movement of the locking plate, achieves the limiting or unlocking of the first and second locking bolts.

[0037] Furthermore, the first lock hole and the second lock hole have the same structure. The first lock hole includes a pressing cavity, a clearance cavity, and a limiting cavity that are connected sequentially from top to bottom. The pressing cavity includes an inclined surface that is inclined from top to bottom and from back to front. When the first lock tongue moves downward, the pressing inclined surface causes the lock plate to move backward, so as to facilitate the first lock tongue to move downward through the clearance cavity and enter the limiting cavity. The rear side wall of the limiting cavity is located behind the rear side wall of the clearance cavity, so that when the first lock tongue enters the limiting cavity, the lock plate moves forward, so that the first lock tongue and the limiting cavity are matched in a vertical limiting manner.

[0038] Beneficial effects: The structure of the first and second lock holes allows the limiting cavity in the second lock hole to release the second lock tongue during the process of the first lock tongue moving downward and pressing the inclined surface into the limiting cavity, ensuring that the first scraper and the second scraper have only one downward protruding mounting shell and glue roller to form a gap for the first felt body to pass through.

[0039] Furthermore, a locking plate guide limiting structure is fixed in the mounting shell. The guide limiting structure has a rear guide member that slides with the rear end of the locking plate and a front guide member that slides with the front end of the locking plate. The rear guide member includes a rear guide groove that is adapted to slide with the rear end of the locking plate. An elastic member that is fixedly connected to the locking plate is provided in the rear guide groove.

[0040] The front guide is fixed to the front side of the mounting shell. The front guide has a rearward-facing front guide groove, which is adapted to guide and slide with the front end of the locking piece.

[0041] Beneficial effects: The front and rear guide members facilitate the movement of the lock plate in the front and rear directions. The elastic element allows the lock plate to return to its original position when the lock tongue enters the limiting cavity, thus creating a stop and limit between the lock tongue and the limiting cavity in the vertical direction.

[0042] It also includes a bonding mechanism, which includes a circular guide disk and a limiting wheel disposed on the outer circumference of the guide disk. The outer circumferential surface of the circular guide disk forms a support surface for the composite felt. The limiting wheel presses the composite felt tightly against the outer circumferential surface of the circular guide disk. A bonding channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide disk.

[0043] Beneficial effects: The bonding mechanism can, on the one hand, cool and solidify the hot melt adhesive between the first and second felts when the composite felt passes through the bonding mechanism; on the other hand, it can further bond the first and second felts when the composite felt passes through the bonding mechanism. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the multilayer aerogel felt stacking and coating device of the present invention;

[0045] Figure 2 yes Figure 1 A schematic diagram of the adhesive quantity adjustment component of the multilayer aerogel felt superposition coating device;

[0046] Figure 3 yes Figure 2 Diagram showing the first usage state of the medium glue amount adjustment component;

[0047] Figure 4 yes Figure 2 Diagram showing the second usage state of the medium glue amount adjustment component;

[0048] Figure 5 yes Figure 3 A magnified view of a portion of the image.

[0049] Reference numerals: 1-First feeding mechanism; 2-Frame; 3-Glue tank; 4-Glue roller; 5-Glue quantity adjustment component; 6-Second feeding mechanism; 7-Circular guide plate; 8-Limiting wheel; 9-Rewinding mechanism; 10-Mounting shell; 11-First button; 12-First blade; 13-First limiting block; 14-First protrusion; 15-First elastic telescopic structure; 16-First receiving cavity; 17-First locking tongue; 18-Third spring; 19-Locking plate; 20-Second receiving cavity; 21-Second button; 22-Second blade; 23-Second limiting block; 24-Second protrusion; 25-Second locking tongue; 26-Second locking hole; 27-Rear guide component. Detailed Implementation

[0050] The following is a more detailed description of the multilayer aerogel felt overlay coating method and coating device of the present invention, with reference to the accompanying drawings and specific embodiments:

[0051] Example 1:

[0052] A method for preparing multilayer aerogel mats includes the following steps:

[0053] S1: The glue application device includes a glue application roller and a glue tank. Hot melt adhesive liquid is added to the glue tank, which is used to hold the hot melt adhesive liquid. The glue application roller is partially immersed in the glue tank.

[0054] S2: The first feeding mechanism 1 in the adhesive coating device unwinds the first felt body, passes the first felt body through the gap between the adhesive amount adjustment component 5 and the adhesive coating component, and rolls the first felt body with adhesive coating roller to prepare a pre-coated felt; the adhesive thickness is 0.02mm.

[0055] Before the first felt body passes through the gap between the glue amount adjustment component and the glue application component, the gap between the glue amount adjustment component and the glue application component is adjusted according to the sum of the thickness of the glue and the thickness of the first felt body. Specifically, pressing down on the first button 11 causes the first blade 12 to move downward, the first elastic telescopic structure to contract, and the first locking tongue to move downward through the clearance cavity and into the limiting cavity, thereby limiting the first blade 12 relative to the mounting shell 10 in the vertical direction. At this time, the first scraper extends out of the first receiving cavity 16 and forms a gap with the glue application roller 4 for the first felt body to pass through. When the first felt body passes through the gap, the glue application roller applies glue to the first felt body to form a pre-coated felt.

[0056] S3: The pre-coated felt prepared in step S2 is bonded to the second felt body conveyed by the second feeding mechanism 6 to prepare a composite felt; the first felt body and the second felt body are both ceramic fiber felt with a thickness of 2mm.

[0057] S4: Cool and solidify the composite felt from step S3 for 30 seconds.

[0058] In this embodiment, by pressing down on the second button 21, the second button 21 drives the second blade 22 to move downward. At this time, the second elastic telescopic structure in the second receiving cavity 20 contracts, and the lower end of the second locking tongue 25 presses down against the inclined surface in the second locking hole 26 pressing cavity. The locking plate 19 moves backward, and the third spring 18 is compressed, causing the second locking tongue 25 to move downward through the clearance cavity and enter the limiting cavity. When the second locking tongue 25 passes through the clearance cavity, the clearance cavity of the first locking hole corresponds to the first locking tongue 17. The first locking tongue 17 moves upward along the clearance cavity. Under the reset action of the first elastic telescopic structure 15, the first scraper moves upward and extends into the first receiving cavity 16. When the second locking tongue 25 passes through the clearance cavity and reaches the limiting cavity, the third spring 18 resets, the locking plate 19 moves forward, and the second locking tongue 25 and the limiting cavity of the second locking hole 26 are vertically limited. The second scraper extends out of the second receiving cavity 20 and forms a gap with the coating roller 4 for the first felt body to pass through, thus completing the gap size adjustment. The cooling time can be adjusted by regulating the unwinding speed of the first and second feeding mechanisms.

[0059] To ensure the bonding and cooling effect of the composite felt, a bonding mechanism is provided. The bonding mechanism includes a circular guide disk 7 and a limiting wheel 8 located on the outer circumference of the guide disk. The outer circumferential surface of the circular guide disk 7 forms the support surface of the composite felt, and the limiting wheel 8 presses the composite felt tightly against the outer circumferential surface of the circular guide disk 7. A bonding channel for the composite felt to pass through is formed between the limiting wheel 8 and the circumferential surface of the guide disk. In this embodiment, the composite felt passes through the bonding channel of the bonding mechanism, and the composite felt cools naturally during the process of passing through the bonding channel, so that the hot melt adhesive between the first felt body and the second felt body is cured; this also makes the composite felt bonded more firmly.

[0060] In this invention, heating of the composite felt is reduced to avoid thermal damage, ensuring that the composite felt has better thermal insulation performance and shortening the production time. The setting of the adhesive amount adjustment component 5 reduces the amount of adhesive used and lowers the production cost. Specifically, the hot melt adhesive application amount of the adhesive application device of this invention is 5-40g / ㎡, which is more than 50% less than the amount of thermosetting adhesive used.

[0061] In step S4, the finished product can also be wound up by the winding mechanism 9 to form a multi-layer aerogel felt.

[0062] It should be noted that the multilayer gel mat lamination and coating device of the present invention is applicable to pre-oxidized fiber aerogel mat, ceramic fiber aerogel mat, wet glass fiber aerogel mat, etc., that is, the first mat body and the second mat body can be pre-oxidized fiber aerogel mat, ceramic fiber aerogel mat, wet glass fiber aerogel mat, etc.

[0063] Example 2

[0064] The difference between this embodiment and embodiment 1 is that the adhesive thickness in step S2 is 0.08 mm and the cooling time in step S4 is 2 min, while the rest are the same as in embodiment 1.

[0065] Example 3

[0066] The difference between this embodiment and embodiment 1 is that the adhesive thickness in step S2 is 0.15 mm and the cooling time in step S4 is 80 s. All other aspects are the same as in embodiment 1.

[0067] Example 4

[0068] The difference between this embodiment and Embodiment 1 is that the adhesive thickness in step S2 is 0.08 mm, and the cooling time in step S4 is 80 seconds; all other aspects are the same as in Embodiment 1. In this embodiment, the gap between the blade and the adhesive roller can be changed by altering the blade length in the adhesive quantity adjustment assembly, thus facilitating the adjustment of the adhesive thickness covering one side of the first felt body.

[0069] Comparative Example

[0070] Comparative Example 1

[0071] The difference between this comparative example and Example 1 is that the adhesive thickness in step S2 is 0.02 mm, and thermosetting adhesive is used. The pre-coated felt prepared in step S2 is bonded to the second felt body conveyed by the second feeding mechanism 6 to form a composite felt. After the composite felt is heated, the thermosetting adhesive is cured to obtain the final product.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 1 is that the adhesive thickness in step S2 is 0.3 mm, while the rest is the same as in Example 1. The composite felt is heated to cure the thermosetting adhesive, thus obtaining the final product.

[0074] Experimental test:

[0075] The samples prepared in Examples 1-4 and Comparative Examples 1-2 were tested. The main steps included: placing the sample on a heating stage with a sample size of 80*80mm, pressing it at 0.9MPa for 5 minutes at 675±15℃, then depressurizing it to 0.03MPa for 20 minutes, and recording the temperature difference between the hot and cold surfaces of the sample after 20 minutes; the results are recorded in the table below.

[0076] Example Temperature difference between hot and cold surfaces (°C) Example 1 528 Example 2 535 Example 3 540 Example 4 543 Comparative Example 1 524 Comparative Example 2 520

[0077] The multilayer aerogel felt preparation apparatus of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0078] like Figures 1-5As shown, the multilayer gel felt preparation apparatus of the present invention includes a first feeding mechanism 1, a coating mechanism, and a second feeding mechanism 6. The first feeding mechanism 1 is used to convey a first felt body. The coating mechanism is disposed close to the first feeding mechanism 1 and is used to coat one side of the first felt body with adhesive. The second feeding mechanism 6 is disposed on the side of the coating mechanism away from the first feeding mechanism. The second feeding mechanism 6 is used to convey a second felt body and to cover the coated side of the first felt body with the second felt body, thereby obtaining a composite felt. In this embodiment, the first feeding mechanism 1 is a first feeding roller, and the second feeding mechanism 6 is a second feeding roller.

[0079] The glue application mechanism includes a frame 2, a glue application assembly, a glue supply assembly, and a glue quantity adjustment assembly 5, which are respectively mounted on the frame 2. The glue supply assembly contains molten hot melt glue. In this embodiment, the glue supply assembly is fixedly mounted relative to the frame 2 in a glue tank 3, which contains molten hot melt glue. The glue application assembly includes a glue application roller 4 that is rotatably mounted relative to the frame 2, with the bottom of the glue application roller 4 immersed in the hot melt glue in the glue tank 3.

[0080] To facilitate the rotation of the coating roller 4, both ends of the coating roller 4 are rotatably mounted on the frame 2 via bearings. One end of the roller shaft of the coating roller 4 is fixed with a first sprocket, a transition sprocket is rotatably mounted on the frame 2, a drive motor is fixed on the frame 2, and a second sprocket is fixed on the output shaft of the drive motor. The second sprocket, the transition sprocket, and the first sprocket are connected by a chain drive that meshes with them, thereby driving the coating roller 4 to rotate via the drive motor.

[0081] In this embodiment, the adhesive quantity adjustment component 5 is positioned directly above the coating roller 4, forming a gap between the adhesive quantity adjustment component 5 and the coating component for the passage of the first felt body. Specifically, the adhesive quantity adjustment component 5 includes a mounting shell 10 fixed on the frame 2. The mounting shell 10 has a first receiving cavity 16 and a second receiving cavity 20 adjacent to each other. A first scraper is vertically guided in the first receiving cavity 16, and a first opening for the first scraper to extend from the bottom of the first receiving cavity 16. A second scraper is vertically guided in the second receiving cavity 20, and a second opening for the second scraper to extend from the bottom of the second receiving cavity 20. In this embodiment, both the first receiving cavity 16 and the second receiving cavity 20 are cavities extending axially along the coating roller 4.

[0082] The first scraper includes a first blade body 12 and a first button 11 fixed on the first blade body 12. The first blade body 12 has a first protrusion 14 that slides and is guided by a first receiving cavity 16. A first limiting block 13 is fixed in the first receiving cavity 16. The first protrusion 14 is located above the first limiting block 13. In this embodiment, the first protrusion 14 is correspondingly arranged on the front and rear sides of the first blade body 12. The first limiting block 13 is fixed on the front and rear sides of the first receiving cavity 16. A first elastic telescopic structure 15 is provided between the first protrusion 14 and the first limiting block 13. In this embodiment, the first elastic telescopic structure 15 includes a telescopic cylinder capable of telescopic movement in the vertical direction. The telescopic cylinder passes through a first spring. The upper end of the first spring is fixedly connected to the first protrusion 14, and the lower end of the first spring is fixedly connected to the first limiting block 13. The telescopic cylinder includes a lower guide cylinder fixed on the first limiting block 13 and an upper guide rod fixed on the first protrusion 14. The upper guide rod is inserted into and adapted to the lower guide cylinder. In this embodiment, the first button 11 slides and is guided by the first receiving cavity 16.

[0083] The second scraper includes a second blade body 22 and a second button 21 fixed on the second blade body 22. The second blade body 22 has a second protrusion 24 that slides and guides the second receiving cavity 20. A second limiting block 23 is fixed in the second receiving cavity 20. The second protrusion 24 is located above the second limiting block 23. In this embodiment, the second protrusion 24 is correspondingly arranged on the front and rear sides of the second blade body 22, and the second limiting block 23 is fixed on the front and rear sides of the second receiving cavity 20. A second elastic telescopic structure is provided between the second protrusion 24 and the second limiting block 23. In this embodiment, the second elastic telescopic structure includes a telescopic cylinder capable of telescopic movement in the vertical direction. The telescopic cylinder passes through a second spring, with the upper end of the second spring fixedly connected to the second protrusion 24 and the lower end of the second spring fixedly connected to the second limiting block 23. The telescopic cylinder includes a lower guide cylinder fixed on the second limiting block 23 and an upper guide rod fixed on the second protrusion 24. The upper guide rod is inserted into and adapted to the lower guide cylinder. In this embodiment, the second button 21 slides and guides the second receiving cavity 20.

[0084] The first scraper and the second scraper have different lengths in the vertical direction. The gap formed between the first scraper and the coating roller 4 after the first scraper extends out of the mounting shell 10 is different from the gap formed between the second scraper and the coating roller 4 after the second scraper extends out of the mounting shell 10. Therefore, by selecting whether the first scraper extends or the second scraper extends, the gap between the scraper and the coating roller 4 can be adjusted, thereby adjusting the thickness of the coated hot melt adhesive layer.

[0085] The mounting housing 10 is provided with a locking structure, which includes a first state in which the first scraper is kept extending out of the first opening and the second scraper is kept extending into the second receiving cavity 20, and a second state in which the first scraper is kept extending into the first receiving cavity 16 and the second scraper is kept extending out of the second opening.

[0086] The locking structure includes a locking piece 19 that is slidably guided relative to the mounting housing 10. A locking piece guide limiting structure is fixed in the mounting housing 10. The guide limiting structure is slidably guided to the rear end of the locking piece 19 by a rear guide member 27 and slidably guided to the front end of the locking piece 19 by a front guide member. The rear guide member 27 includes a rear guide groove that is adapted to the rear end of the locking piece 19. An elastic member that is fixedly connected to the locking piece 19 is provided in the rear guide groove. In this embodiment, the elastic member is a horizontally arranged third spring 18. The front guide member is fixed to the front side of the mounting housing 10. A front guide groove with an opening facing rearward is provided on the front guide member. The front guide groove is adapted to the front end of the locking piece 19 by a guide.

[0087] The lock plate 19 is provided with a first lock hole and a second lock hole 26 respectively. The first button 11 is fixed with a first latch 17 corresponding to the first lock hole, and the second button 21 is fixed with a second latch 25 corresponding to the second lock hole 26.

[0088] The first lock hole and the second lock hole 26 have the same structure. The first lock hole includes a pressing cavity, a relief cavity, and a limiting cavity that are connected sequentially from top to bottom. The pressing cavity includes an inclined surface that is inclined from top to bottom and from back to front. When the first lock tongue 17 moves downward, the pressing inclined surface causes the locking plate 19 to move backward, so that the first lock tongue 17 can move downward through the relief cavity and enter the limiting cavity. The rear side wall of the limiting cavity is located behind the rear side wall of the relief cavity, so that when the first lock tongue 17 enters the limiting cavity, the locking plate 19 moves forward, so that the first lock tongue 17 and the limiting cavity are in upper and lower limiting fit.

[0089] It also includes a bonding mechanism, which includes a circular guide disk 7 and a limiting wheel 8 disposed on the outer circumference of the guide disk. The outer circumferential surface of the circular guide disk 7 forms a support surface for the composite felt, and the limiting wheel 8 presses the composite felt tightly against the outer circumferential surface of the circular guide disk 7. A bonding channel for the composite felt to pass through is formed between the limiting wheel 8 and the circumferential surface of the guide disk.

[0090] In use, the first feeding mechanism 1 conveys the first felt body, which passes through the adhesive coating mechanism. The adhesive coating mechanism coats one side of the first felt body with hot melt adhesive. The second feeding mechanism 6 conveys the second felt body, which covers the adhesive-coated side of the first felt body to obtain a composite felt. The composite felt is cooled at room temperature, which causes the hot melt adhesive between the first and second felt bodies to solidify. This eliminates the need to heat the aerogel felt to solidify the adhesive, avoiding heat damage to the composite felt and ensuring that the composite felt has better thermal insulation performance.

[0091] The bonding mechanism serves two purposes: firstly, it allows the hot melt adhesive between the first and second felt bodies to cool and solidify as the composite felt passes through it; secondly, it allows the first and second felt bodies to be further bonded together as the composite felt passes through it.

[0092] The adhesive application mechanism includes an adhesive amount adjustment component 5. A gap is formed between the adhesive amount adjustment component 5 and the adhesive application component to allow the first felt body to pass through. The size of the gap is adjustable to facilitate the adjustment of the thickness of the hot melt adhesive applied to the first felt body and avoid waste of hot melt adhesive. In specific use, the first scraper is kept in the state of being extended out of the first opening, and the second scraper is kept in the state of being inserted into the first receiving cavity 16. At this time, the first locking tongue 17 of the locking structure is located in the limiting cavity of the first locking hole, the second locking tongue 25 of the locking structure is located in the top pressure cavity of the second locking hole 26, and the third spring 18 in the guide limiting structure is in the natural state.

[0093] When the adhesive thickness needs to be adjusted, in this embodiment, the second button 21 is pressed down, which drives the second blade 22 to move downward. At this time, the second elastic telescopic structure in the second receiving cavity 20 contracts, and the lower end of the second locking tongue 25 presses down against the inclined surface in the second locking hole 26 pressing cavity. The locking plate 19 moves backward, and the third spring 18 is compressed, causing the second locking tongue 25 to move downward through the clearance cavity and into the limiting cavity. When the second locking tongue 25 passes through the clearance cavity, the clearance cavity of the first locking hole corresponds to the first locking tongue 17. The first locking tongue 17 moves upward along the clearance cavity. Under the reset action of the first elastic telescopic structure 15, the first scraper moves upward and extends into the first receiving cavity 16. When the second locking tongue 25 passes through the clearance cavity and reaches the limiting cavity, the third spring 18 resets, the locking plate 19 moves forward, and the second locking tongue 25 and the limiting cavity of the second locking hole 26 are vertically limited. The second scraper extends out of the second receiving cavity 20 and forms a gap with the adhesive roller 4 for the first felt to pass through, thus completing the gap size adjustment.

[0094] In the above embodiments, the mounting shell is provided with a first accommodating cavity and a second accommodating cavity that are adjacent to each other; in other embodiments, the mounting shell is provided with a first accommodating cavity, a second accommodating cavity and a third accommodating cavity that are adjacent to each other.

[0095] In the above embodiments, the locking structure includes a locking plate that is slidably guided relative to the mounting shell. The locking plate is provided with a first locking hole and a second locking hole respectively. A first locking tongue corresponding to the first locking hole is fixed on the first button, and a second locking tongue corresponding to the second locking hole is fixed on the second button. In other embodiments, the locking structure may also be configured in other structural forms.

[0096] In the above embodiments, a locking plate guide and limiting structure is fixed in the mounting shell. The guide and limiting structure has a rear guide member that slides with the rear end of the locking plate and a front guide member that slides with the front end of the locking plate. The rear guide member includes a rear guide groove that is adapted to slide with the rear end of the locking plate. An elastic member that is fixedly connected to the locking plate is provided in the rear guide groove. In other embodiments, the locking plate guide and limiting structure may also be other structural forms.

[0097] In the above embodiments, a bonding mechanism is also included, which includes a circular guide disk and a limiting wheel disposed on the outer circumference of the guide disk. The outer circumferential surface of the circular guide disk forms a support surface for the composite felt, and the limiting wheel presses the composite felt tightly against the outer circumferential surface of the circular guide disk. A bonding channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide disk. In other embodiments, the bonding mechanism may not be provided.

Claims

1. A glue-applying device, characterized in that, The adhesive application device includes: The first feeding mechanism is configured to transfer the first felt body; The glue-applying mechanism, located near the first feeding mechanism, is used to apply glue to one side of the first felt body; and The second feeding mechanism is located on the side of the adhesive coating mechanism away from the first feeding mechanism. The second feeding mechanism is used to convey the second felt body and to cover the adhesive-coated side of the first felt body, thus obtaining a composite felt; wherein... The glue application mechanism includes a frame, a glue application assembly, a glue supply assembly, and a glue quantity adjustment assembly; The glue application assembly, glue supply assembly, and glue quantity adjustment assembly are respectively mounted on the frame; The adhesive supply assembly contains molten hot melt adhesive; A gap is formed between the adhesive amount adjustment component and the adhesive application component to allow the first felt body to pass through. The size of the gap can be adjusted to adjust the thickness of the hot melt adhesive layer applied to the first felt body. The glue supply assembly includes a glue tank fixedly disposed relative to the frame, and the glue application assembly includes a glue application roller rotatably disposed relative to the frame, with the bottom of the glue application roller immersed in the hot melt glue in the glue tank; The adhesive quantity adjustment assembly includes a mounting shell fixed on the frame, and the mounting shell is provided with a first receiving cavity and a second receiving cavity that are adjacent to each other at the front and rear. The first receiving cavity is equipped with a first scraper that is guided vertically in the first receiving cavity, and the bottom of the first receiving cavity is provided with a first opening for the first scraper to extend out. The second cavity is equipped with a second scraper that is guided vertically, and the bottom of the second cavity has a second opening for the second scraper to extend out. The mounting housing is provided with a locking structure, which includes a first state in which the first scraper is kept extended out of the first opening and the second scraper is kept inserted into the second receiving cavity; and a second state in which the first scraper is kept inserted into the first receiving cavity and the second scraper is kept extended out of the second opening. The first scraper and the second scraper have different lengths, and the gap formed between the first scraper and the coating roller after the first scraper extends out of the mounting housing is different from the gap formed between the second scraper and the coating roller after the second scraper extends out of the mounting housing.

2. The adhesive applicator according to claim 1, characterized in that, The first scraper includes a first blade body and a first button fixed on the first blade body. The first blade body is provided with a first protrusion that is adapted to slide along a first receiving cavity. A first limiting block is fixed in the first receiving cavity. The first protrusion is located above the first limiting block. A first elastic telescopic structure is provided between the first protrusion and the first limiting block. The second scraper includes a second blade body and a second button fixed on the second blade body. The second blade body is provided with a second protrusion that is adapted to slide along a second receiving cavity. A second limiting block is fixed in the second receiving cavity. The second protrusion is located above the second limiting block. A second elastic telescopic structure is provided between the second protrusion and the second limiting block.

3. The adhesive applicator according to claim 2, characterized in that, The locking structure includes a locking plate that is slidably guided relative to the mounting shell. The locking plate is provided with a first locking hole and a second locking hole. A first locking tongue corresponding to the first locking hole is fixed on the first button, and a second locking tongue corresponding to the second locking hole is fixed on the second button.

4. The adhesive applicator according to claim 3, characterized in that, The first lock hole and the second lock hole have the same structure. The first lock hole includes a pressing cavity, a clearance cavity, and a limiting cavity that are connected sequentially from top to bottom. The pressing cavity includes an inclined surface that is inclined from top to bottom and from back to front. When the first lock tongue moves downward, the pressing inclined surface causes the lock plate to move backward, so that the first lock tongue can move downward through the clearance cavity and enter the limiting cavity. The rear side wall of the limiting cavity is located behind the rear side wall of the clearance cavity, so that when the first lock tongue enters the limiting cavity, the lock plate moves forward, so that the first lock tongue and the limiting cavity are matched in a vertical limiting manner.

5. The adhesive applicator according to claim 4, characterized in that, The mounting housing is fixed with a locking plate guide limiting structure, a rear guide member that slides with the rear end of the locking plate and a front guide member that slides with the front end of the locking plate. The rear guide member includes a rear guide groove that is adapted to slide with the rear end of the locking plate, and an elastic member that is fixedly connected to the locking plate is provided in the rear guide groove. The front guide is fixed to the front side of the mounting shell. The front guide has a rearward-facing front guide groove, which is adapted to guide and slide with the front end of the locking piece.

6. The adhesive applicator according to any one of claims 1-5, characterized in that, It also includes a bonding mechanism, which includes a circular guide disk and a limiting wheel disposed on the outer circumference of the guide disk. The outer circumferential surface of the circular guide disk forms a support surface for the composite felt. The limiting wheel presses the composite felt tightly against the outer circumferential surface of the circular guide disk. A bonding channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide disk.

7. A method for preparing a multilayer aerogel mat using the coating apparatus according to any one of claims 1-5, characterized in that, Includes the following steps: S1: Add hot melt adhesive liquid to the adhesive applicator. The adhesive applicator includes an adhesive applicator roller and an adhesive tank. The adhesive tank is used to hold the hot melt adhesive liquid, and the adhesive applicator roller is partially immersed in the adhesive tank. S2: The adhesive coating device also includes a first feeding mechanism, an adhesive quantity adjustment component and an adhesive coating component. The first feeding mechanism unwinds the first felt body, and the first felt body passes through the gap between the adhesive quantity adjustment component and the adhesive coating component. The adhesive coating roller coats the first felt body to prepare a pre-coated felt. S3: The pre-coated felt prepared in step S2 is bonded to the second felt body conveyed by the second feeding mechanism in the adhesive coating device to prepare a composite felt. S4: Cool and solidify the composite felt from step S3 to obtain the final product.

8. The method for preparing multilayer aerogel mat according to claim 7, characterized in that: In step S2, the thickness of the adhesive applied to the first felt body by roller is 0.02-0.15 mm; in step S4, the cooling and curing time is 30 seconds to 2 minutes.

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