Preparation method of multi-layer aerogel felt and gluing device of multi-layer aerogel felt

Abstract

The invention relates to a multilayer aerogel felt preparation method and a gluing device.The method comprises the following steps that S1, a hot melt adhesive solution is added into the gluing device, the gluing device comprises a gluing roller and a glue tank, the glue tank is used for containing the hot melt adhesive solution, and the gluing roller is partially immersed in the glue tank; s2, a first felt body is unwound through a first feeding mechanism, the first felt body passes through a gap between a glue amount adjusting assembly and a gluing assembly, roller coating is conducted on the first felt body through a gluing roller, and a pre-coating felt is prepared; s3, laminating the pre-coated felt prepared in the step S2 with a second felt body conveyed by a second feeding mechanism to prepare a composite felt; and S4, cooling and curing the composite felt in the step S3 to obtain the composite felt. The composite felt is cooled at normal temperature, so that the hot melt adhesive between the first felt body and the second felt body is condensed and cured, the curing of the adhesive solution is realized without heating the aerogel felt, the thermal damage to the composite felt is avoided, and the composite felt is ensured to have better heat insulation performance.

Description

Technical Field

[0001] The invention belongs to the technical field of felt body processing and production, and in particular relates to a method for preparing a multi-layer aerogel felt and a gluing device thereof. Background Art

[0002] Aerogel felt is a felt structure formed by compounding aerogel glue and fiber felt. Since aerogel felt has excellent thermal insulation properties, is resistant to high temperatures and does not produce harmful gases, aerogel felt products are used as high-efficiency thermal insulation materials in many fields such as the new energy vehicle industry, home appliances, and smart electronic products.

[0003] Aerogel glue coating and stacking: In the process of preparing multiple layers of aerogel felt, the aerogel felt is coated with glue so that the sheets of aerogel felt are fitted and stacked to prepare an aerogel felt of a desired thickness.

[0004] At present, in production, thermosetting glue is often used for gluing aerogel felt, that is, the glue liquid is applied to the aerogel sheet layer, and after stacking, it is heated to accelerate the curing of the liquid glue liquid, so as to achieve bonding between the aerogel felt sheets and complete the stacking of the aerogel sheets; however, since the aerogel felt has good thermal insulation properties, the curing process of the glue liquid is achieved by heating the aerogel felt, and the curing process of the glue liquid is slow, and the bonding rate between the aerogel felt sheets is slow, which affects the preparation rate; at the same time, the heating method will cause thermal damage to the aerogel sheet layer, affecting the thermal insulation properties of the prepared multi-layer aerogel felt. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for preparing a multilayer aerogel felt to solve the problem in the prior art that heating the aerogel felt to achieve curing of the glue solution will cause thermal damage to the aerogel sheet layer. The present invention also provides a gluing device for preparing a multilayer aerogel felt.

[0006] In the first aspect, in order to achieve the above-mentioned purpose, the present invention discloses a method for preparing a multi-layer aerogel felt by stacking. The technical scheme adopted is:

[0007] A method for preparing a multilayer aerogel felt comprises the following steps:

[0008] S1: adding hot melt adhesive liquid to the glue coating device, the glue coating device comprises a glue coating roller and a glue tank, the glue tank is used to hold the hot melt adhesive liquid, and the glue coating roller is partially immersed in the glue tank;

[0009] S2: The glue coating device further comprises a first feeding mechanism, a glue quantity adjusting component and a glue coating component. The first felt body is unwound by the first feeding mechanism, the first felt body is passed through a gap between the glue quantity adjusting component and the glue coating component, and the first felt body is roll-coated by a glue coating roller to prepare a pre-coated felt;

[0010] S3: laminating the pre-coated felt prepared in step S2 with the second felt body conveyed by the second feeding mechanism in the gluing device to prepare a composite felt;

[0011] S4: Cooling and solidifying the composite felt in step S3 to obtain.

[0012] Beneficial effect: In the production process of multi-layer stacked insulation felt, hot melt adhesive is used. The hot melt adhesive is solidified by cooling. After the sheets are coated with glue and stacked, there is no need to heat the sheets of aerogel felt after the glue is coated and stacked. The sheets of aerogel felt can be bonded and stacked by cooling. Therefore, the stacking and bonding rate of the sheets of aerogel felt is faster and the process is simpler. On the other hand, there is no need to heat the aerogel felt, which results in a slower solidification effect of the colloid due to the thermal insulation performance of the aerogel felt, and reduces the thermal damage to the insulation pad caused by heating and curing.

[0013] Furthermore, in step S2, the thickness of the glue coating on the first felt body is 0.02-0.2 mm; and in step S4, the cooling and curing time is 1-2 min.

[0014] Beneficial effects: By adjusting the curing time and the thickness of the glue coating, the thickness of the glue has a more obvious effect on the thermal insulation performance of the composite felt. When the thickness of the glue is too thick, the glue has better heat transfer, which will affect the thermal insulation performance of the finished product; however, when the thickness of the glue is thin, the internal bonding performance of the composite felt is poor, and the stability of the composite felt is poor, which affects the subsequent use. Therefore, the choice of glue thickness has a more critical influence on the thermal insulation performance of the composite felt. Both the curing time and the thickness of the glue coating will affect the bonding of the first felt body and the second felt body, reducing the occurrence of wire drawing due to too short curing time. At the same time, too long curing time will affect production efficiency.

[0015] In a second aspect, the present application provides a multilayer aerogel felt preparation device, including the following scheme:

[0016] A glue coating device is used in conjunction with a method for preparing a multi-layer aerogel felt, the glue coating device comprising:

[0017] A first feeding mechanism, the first feeding mechanism is configured to transfer a first felt body;

[0018] A gluing mechanism, disposed close to the first feeding mechanism, for gluing one side of the first felt body; and

[0019] The second feeding mechanism is arranged on the side of the gluing mechanism away from the first feeding mechanism, and the second feeding mechanism is used to convey the second felt body and make the second felt body cover the gluing side of the first felt body to obtain a composite felt; wherein,

[0020] The glue coating mechanism includes a frame, a glue coating component, a glue supply component, and a glue quantity adjustment component;

[0021] The glue coating component, glue supply component and glue quantity adjustment component are respectively arranged on the frame;

[0022] The glue supply component contains molten hot melt glue;

[0023] A gap is formed between the glue quantity regulating component and the glue coating component for the first felt body to pass through, and the size of the gap is adjustable to adjust the thickness of the hot melt adhesive layer coated on the first felt body.

[0024] Beneficial effect: In the present invention, the first feeding mechanism conveys the first felt body, the first felt body passes through the gluing mechanism, the gluing mechanism coats hot melt adhesive on one side of the first felt body, the second feeding mechanism conveys the second felt body, the second felt body covers the gluing side of the first felt body, and a composite felt is obtained. The composite felt is cooled at room temperature, so that the hot melt adhesive between the first felt body and the second felt body condenses and solidifies, and there is no need to heat the aerogel felt to solidify the adhesive liquid, thereby avoiding thermal damage to the composite felt and ensuring that the composite felt has better thermal insulation performance. The gluing mechanism includes a glue amount adjustment component, and a gap is formed between the glue amount adjustment component and the gluing component for the first felt body to pass through. The size of the gap is adjustable, so as to facilitate the adjustment of the thickness of the hot melt adhesive coated on the first felt body and avoid waste of hot melt adhesive.

[0025] Furthermore, the glue supply component includes a glue groove fixedly arranged relative to the frame, and the glue coating component includes a glue coating roller rotatably arranged relative to the frame, and the bottom of the glue coating roller is immersed in the hot melt glue in the glue groove.

[0026] Beneficial effect: The glue coating roller is rotated to facilitate the hot melt glue in the glue tank to adhere to the glue coating roller, so that the glue coating roller transfers the hot melt glue to the first felt body passing by.

[0027] Furthermore, the glue quantity adjustment component comprises a mounting shell fixed on the frame, and a first accommodating cavity and a second accommodating cavity adjacent to each other are arranged in the mounting shell;

[0028] A first scraper is provided in the first accommodating cavity for guiding upward and downward movement, and a first opening is provided at the bottom of the first accommodating cavity for the first scraper to extend out;

[0029] A second scraper is arranged in the second accommodating cavity for guiding upward and downward movement, and a second opening is provided at the bottom of the second accommodating cavity for the second scraper to extend out;

[0030] A locking structure is provided in the mounting shell, the locking structure including 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 accommodating cavity, and a second state in which the first scraper is kept extending into the first accommodating 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 glue coating roller after the first scraper extends out of the mounting shell is different from the gap formed between the second scraper and the glue coating roller after the first scraper extends out of the mounting shell.

[0032] Beneficial effects: a first scraper is extended from the glue amount adjustment component, and a gap is formed between the first scraper and the glue coating roller for the first felt body to pass through; a second scraper is extended, and a gap is also formed between the second scraper and the glue coating roller for the first felt body to pass through. Since the first scraper and the second scraper have different lengths, the gap formed between the first scraper and the glue coating roller is different from the gap formed between the second scraper and the glue coating roller, thereby facilitating the adjustment of the thickness of the glue layer covering one side of the first felt body.

[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 convex rib that is adapted to slide with the guide of the first accommodating cavity, a first limiting block is fixed in the first accommodating cavity, the first convex rib is located above the first limiting block, and a first elastic telescopic structure is provided between the first convex rib 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 convex rib that is adapted to slide with the guide of the second accommodating cavity, a second limiting block is fixed in the second accommodating cavity, the second convex rib is located above the second limiting block, and a second elastic telescopic structure is provided between the second convex rib and the second limiting block.

[0034] Beneficial effects: The setting of the first button and the second button facilitates the downward pressing of the first scraper and the second scraper, and the setting of the first elastic telescopic structure and the second elastic telescopic structure facilitates the resetting of the first scraper and the second scraper.

[0035] Furthermore, the locking structure includes a locking plate that is slidingly arranged to guide forward and backward relative to the mounting shell, and the locking plate is respectively 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.

[0036] Beneficial effect: The locking structure achieves the limitation or unlocking of the first locking tongue and the second locking tongue by moving the locking plate forward and backward.

[0037] Furthermore, the first lock hole has the same structure as the second lock hole, and the first lock hole includes a top pressure chamber, an avoidance chamber, and a limit chamber which are sequentially connected from top to bottom, and the top pressure chamber includes an inclined surface which is inclined from top to bottom and from back to front, and when the first lock tongue moves downward, the top pressure inclined surface causes the locking plate to move backward to facilitate the first lock tongue to move downward through the avoidance chamber and enter the limit chamber; the rear side wall of the limit chamber is located behind the rear side wall of the avoidance chamber, so that when the first lock tongue enters the limit chamber, the locking plate moves forward, so that the first lock tongue cooperates with the upper and lower limit positions of the limit chamber.

[0038] Beneficial effect: The structure of the first lock hole and the second lock hole can release the limitation of the second lock tongue by the limiting cavity in the second lock hole when the first lock tongue moves downward to press the inclined surface and enter the limiting cavity, thereby ensuring that only one of the first scraper and the second scraper extends downward to form a gap for the first felt body to pass through between the mounting shell and the glue coating roller.

[0039] Furthermore, a locking plate guide limiting structure is fixed in the mounting shell, the guide limiting structure is connected to a rear guide member that guides and slides with the rear end of the locking plate and a front guide member that guides and 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;

[0040] The front guide piece is fixed on the front side of the installation shell. The front guide piece is provided with a front guide groove with an opening facing backwards. The front guide groove is slidingly adapted to guide the front end of the locking piece.

[0041] Beneficial effects: The setting of the front guide member and the rear guide member facilitates the movement of the locking plate in the front and rear directions. The setting of the elastic member can reset the locking plate forward when the locking tongue enters the limiting cavity, so that the locking tongue and the limiting cavity form a blocking limit in the upper and lower directions.

[0042] It also includes a fitting mechanism, which includes a circular guide plate and a limiting wheel arranged outside the circumference of the guide plate, the outer circumferential surface of the circular guide plate forms a supporting surface for the composite felt, and the limiting wheel presses the composite felt and the outer circumferential surface of the circular guide plate into fit; a fitting channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide plate.

[0043] Beneficial effects: The setting of the bonding mechanism can, on the one hand, cool and solidify the hot melt adhesive between the first felt body and the second felt body when the composite felt passes through the bonding mechanism; on the other hand, can further bond the first felt body and the second felt body when the composite felt passes through the bonding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of a multi-layer aerogel felt superimposed glue coating device of the present invention;

[0045] Figure 2 yes Figure 1 A schematic diagram of the structure of the glue quantity adjustment component of the multi-layer aerogel felt superimposed glue coating device;

[0046] Figure 3 yes Figure 2 The first use state diagram of the middle glue amount adjustment component;

[0047] Figure 4 yes Figure 2 The second use state diagram of the middle glue amount adjustment component;

[0048] Figure 5 yes Figure 3 A partial enlarged view of .

[0049] Figure markings: 1-first feeding mechanism; 2-frame; 3-glue groove; 4-glue coating roller; 5-glue quantity adjustment assembly; 6-second feeding mechanism; 7-circular guide plate; 8-limiting wheel; 9-winding mechanism; 10-installation shell; 11-first button; 12-first knife body; 13-first limiting block; 14-first convex rib; 15-first elastic telescopic structure; 16-first accommodating cavity; 17-first locking tongue; 18-third spring; 19-locking plate; 20-second accommodating cavity; 21-second button; 22-second knife body; 23-second limiting block; 24-second convex rib; 25-second locking tongue; 26-second locking hole; 27-rear guide. DETAILED DESCRIPTION

[0050] The following is a further detailed description of the multi-layer aerogel felt superimposed gluing method and the gluing device of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0051] Embodiment 1:

[0052] The method for preparing a multilayer aerogel felt comprises the following steps:

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

[0054] S2: The first feeding mechanism 1 in the glue coating device unwinds the first felt body, passes the first felt body through the gap between the glue quantity adjustment component 5 and the glue coating component, and is roll-coated by a glue coating roller to prepare a pre-coated felt; the glue liquid thickness is 0.02 mm;

[0055] Before the first felt body passes through the gap between the glue amount adjusting component and the glue coating component, the gap between the glue amount adjusting component and the glue coating component is adjusted according to the sum of the thickness of the glue liquid and the first felt body. Specifically, the first button 11 is pressed downward, and the first button 11 drives the first blade body 12 to move downward, the first elastic telescopic structure contracts, and the first lock tongue moves downward through the avoidance cavity and moves into the limiting cavity, so as to limit the first blade body 12 relative to the mounting shell 10 in the vertical direction. At this time, the first scraper extends out of the first accommodating cavity 16 and forms a gap with the glue coating roller 4 for the first felt body to pass through. When the first felt body passes through the gap, the glue coating roller coats the first felt body with glue to form a pre-coated felt;

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

[0057] S4: Cooling and curing the composite felt in step S3, the cooling time is 30S.

[0058] In this embodiment, by pressing the second button 21 downward, the second button 21 drives the second blade 22 to move downward, at which time the second elastic telescopic structure in the second accommodating cavity 20 contracts, and the lower end of the second lock tongue 25 presses downward against the inclined surface in the second lock hole 26. The lock plate 19 moves backward, and the third spring 18 is compressed, so that the second lock tongue 25 moves downward through the avoidance cavity and enters the limit cavity. When the second lock tongue 25 passes through the avoidance cavity, the avoidance cavity of the first lock hole corresponds to the first lock tongue 17, and the first lock tongue 17 moves upward along the avoidance cavity. Under the reset action of the first elastic telescopic structure 15, the first scraper moves upward and extends into the first accommodating cavity 16; when the second lock tongue 25 passes through the avoidance cavity and reaches the limit cavity, the third spring 18 is reset, the lock plate 19 moves forward, the second lock tongue 25 and the limit cavity of the second lock hole 26 are limited up and down, and the second scraper extends out of the second accommodating cavity 20 and forms a gap for the first felt body to pass through with the glue roller 4, and the gap size adjustment is also completed. The cooling time is adjusted by adjusting the unwinding speed of the first feeding mechanism and the second feeding mechanism.

[0059] In order to ensure the laminating and cooling effect of the composite felt, a laminating mechanism is provided, which includes a circular guide plate 7 and a limiting wheel 8 arranged outside the circumference of the guide plate. The outer circumference of the circular guide plate 7 forms a supporting surface of the composite felt, and the limiting wheel 8 presses the composite felt and the outer circumference of the circular guide plate 7 into a close fit; a laminating channel for the composite felt to pass through is formed between the limiting wheel 8 and the circumference of the guide plate; in this embodiment, the composite felt passes through the laminating channel of the laminating mechanism, and the composite felt is naturally cooled during the process of passing through the laminating channel, so that the hot melt adhesive between the first felt body and the second felt body is solidified; it can also make the composite felt more firmly adhered;

[0060] In the present invention, the heating of the composite felt is reduced, thermal damage to the composite felt is avoided, the composite felt is ensured to have better thermal insulation performance, and the production time is shortened; the setting of the glue amount adjustment component 5 reduces the amount of glue liquid and reduces the production cost. Specifically, the glue coating device of the present invention has a hot melt glue coating amount of 5-40g / ㎡, which is more than 50% less than the amount of thermosetting glue;

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

[0062] It should be noted that the multi-layer gel felt stacking and gluing device of the present invention is suitable for pre-oxidized silk aerogel felt, ceramic fiber aerogel felt, wet-process glass fiber aerogel felt, etc., that is, the first felt body and the second felt body can be pre-oxidized silk aerogel felt, ceramic fiber aerogel felt, wet-process glass fiber aerogel felt, etc.

[0063] Example 2

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

[0065] Example 3

[0066] The difference between this embodiment and embodiment 1 is that the coating thickness in step S2 is 0.15 mm, the cooling time in step S4 is 80 seconds, and the rest is the same as in embodiment 1.

[0067] Example 4

[0068] The difference between this embodiment and embodiment 1 is that the glue coating thickness in step S2 is 0.08 mm, the cooling time in step S4 is 80 seconds, and the rest is the same as that in embodiment 1. In this embodiment, the length of the knife body in the glue amount adjustment assembly can be changed to change the size of the gap formed between the knife body and the glue coating roller, so as to facilitate the adjustment of the thickness of the glue 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 glue coating thickness in step S2 is 0.02 mm, and thermosetting glue 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, and then the composite felt is heated to cure the thermosetting glue.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 1 is that the thickness of the glue coating in step S2 is 0.3 mm, and the rest is the same as in Example 1, and the composite felt is heated to solidify the thermosetting glue.

[0074] Experimental test:

[0075] The samples prepared in Examples 1-4 and Comparative Examples 1-2 were tested, and the main steps included: placing the samples on a heating table, sample size: 80*80mm, at 675±15°C, first pressurizing at 0.9MPa for 5min, then unloading the pressure to 0.03MPa for 20min, and recording the temperature difference between the hot and cold surfaces of the samples after 20min; recording in the table below;

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

[0077] The following is a further detailed description of the multilayer aerogel felt preparation device of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0078] like Figure 1-Figure 5As shown, the multi-layer gel felt preparation device of the present invention comprises a first feeding mechanism 1, a gluing mechanism, and a second feeding mechanism 6. The first feeding mechanism 1 is used to convey a first felt body, and the gluing mechanism is arranged close to the first feeding mechanism 1, and the gluing mechanism is used to gluing one side of the first felt body; the second feeding mechanism 6 is arranged on a side of the gluing mechanism away from the first feeding structure, and the second feeding mechanism 6 is used to convey a second felt body, and make the second felt body cover the gluing side of the first felt body, so as to obtain 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 coating mechanism includes a frame 2, a glue coating component, a glue supply component, and a glue quantity adjustment component 5, which are respectively arranged on the frame 2. The glue supply component contains molten hot melt glue. In this embodiment, the glue supply component is fixedly arranged in the glue groove 3 relative to the frame 2, and the glue groove 3 contains molten hot melt glue. The glue coating component includes a glue coating roller 4 rotatably arranged relative to the frame 2, and the bottom of the glue coating roller 4 is immersed in the hot melt glue in the glue groove 3.

[0080] In order to facilitate the rotation of the glue coating roller 4, both ends of the glue coating roller 4 are rotatably arranged on the frame 2 through bearings, a first sprocket is fixed to one end of the roller shaft of the glue coating roller 4, a transition sprocket is rotatably arranged on the frame 2, a driving motor is fixed to the frame 2, and a second sprocket is fixed to the output shaft of the driving motor. The second sprocket, the transition sprocket and the first sprocket are connected by a chain transmission engaged therewith, thereby driving the glue coating roller 4 to rotate through the driving motor.

[0081] In this embodiment, the glue quantity adjustment component 5 is correspondingly arranged just above the glue coating roller 4, and a gap is formed between the glue quantity adjustment component 5 and the glue coating component for the first felt body to pass through. Specifically, the glue quantity adjustment component 5 includes a mounting shell 10 fixed on the frame 2, and the mounting shell 10 is provided with a first accommodating chamber 16 and a second accommodating chamber 20 adjacent to each other in front and back. A first scraper is arranged in the first accommodating chamber 16 for upward and downward guidance, and a first opening is provided at the bottom of the first accommodating chamber 16 for the first scraper to extend out; a second scraper is arranged in the second accommodating chamber 20 for upward and downward guidance, and a second opening is provided at the bottom of the second accommodating chamber 20 for the second scraper to extend out. In this embodiment, the first accommodating chamber 16 and the second accommodating chamber 20 are both cavities extending along the axial direction of the glue 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 is provided with a first convex rib 14 that is adapted to slide and guide the first accommodating cavity 16. A first stop block 13 is fixed in the first accommodating cavity 16. The first convex rib 14 is located above the first stop block 13. In this embodiment, the first convex rib 14 is correspondingly arranged on the front and rear sides of the first blade body 12. The first stop block 13 is fixed on the front and rear sides of the first accommodating cavity 16. A first elastic telescopic structure 15 is arranged between the first convex rib 14 and the first stop block 13. In this embodiment, the first elastic telescopic structure 15 includes a telescopic cylinder that can be telescopic in the up and down directions. The telescopic cylinder is inserted in the first spring. The upper end of the first spring is fixedly connected to the first convex rib 14, and the lower end of the first spring is fixedly connected to the first stop block 13. The telescopic cylinder includes a lower guide cylinder fixed on the first stop block 13 and an upper guide rod fixed on the first convex rib 14. The upper guide rod is plugged and adapted to the lower guide cylinder. In this embodiment, the first button 11 is adapted to slide and guide the first accommodating 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 is provided with a second convex rib 24 adapted to slide with the second accommodating cavity 20. A second stop block 23 is fixed in the second accommodating cavity 20. The second convex rib 24 is located above the second stop block 23. In this embodiment, the second convex rib 24 is correspondingly arranged on the front and rear sides of the second blade body 22. The second stop block 23 is fixed on the front and rear sides of the second accommodating cavity 20. A second elastic telescopic structure is arranged between the second convex rib 24 and the second stop block 23. In this embodiment, the second elastic telescopic structure includes a telescopic cylinder that can be telescoped in the up and down directions. The telescopic cylinder is inserted in the second spring. The upper end of the second spring is fixedly connected to the second convex rib 24, and the lower end of the second spring is fixedly connected to the second stop block 23. The telescopic cylinder includes a lower guide cylinder fixed on the second stop block 23 and an upper guide rod fixed on the second convex rib 24. The upper guide rod is plugged and adapted to the lower guide cylinder. In this embodiment, the second button 21 is adapted to slide with the second accommodating cavity 20.

[0084] The first scraper and the second scraper have different lengths in the up and down directions. The gap formed between the first scraper and the glue 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 glue coating roller 4 after the second scraper extends out of the mounting shell 10. Therefore, by selecting the first scraper to extend or the second scraper to extend, the gap between the scraper and the glue coating roller 4 is adjusted, thereby adjusting the thickness of the coated hot melt adhesive layer.

[0085] A locking structure is provided in the mounting shell 10, 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 accommodating cavity 20, and a second state in which the first scraper is kept extending into the first accommodating cavity 16 and the second scraper is kept extending out of the second opening.

[0086] The locking structure includes a locking plate 19 which is arranged to slide forward and backward relative to the mounting shell 10, a locking plate guide limiting structure is fixed in the mounting shell 10, a rear guide member 27 which slides with the rear end guide of the locking plate 19 and a front guide member which slides with the front end guide of the locking plate 19, the rear guide member 27 includes a rear guide groove which is adapted to slide with the rear end guide of the locking plate 19, an elastic member which is fixedly connected to the locking plate 19 is arranged in the rear guide groove, in this embodiment, the elastic member is a third spring 18 which is arranged horizontally; the front guide member is fixed to the front side of the mounting shell 10, a front guide groove which opens toward the rear is provided on the front guide member, and the front guide groove is adapted to slide with the front end guide of the locking plate 19.

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

[0088] The first lock hole has the same structure as the second lock hole 26. The first lock hole includes a top pressure chamber, an avoidance chamber, and a limit chamber which are sequentially connected from top to bottom. The top pressure chamber includes an inclined surface which is inclined from top to bottom and from back to front. When the first lock tongue 17 moves downward, the top pressure inclined surface causes the locking plate 19 to move backward, so as to facilitate the first lock tongue 17 to move downward through the avoidance chamber and enter the limit chamber; the rear side wall of the limit chamber is located behind the rear side wall of the avoidance chamber, so that when the first lock tongue 17 enters the limit chamber, the locking plate 19 moves forward, so that the first lock tongue 17 cooperates with the upper and lower limit positions of the limit chamber.

[0089] It also includes a fitting mechanism, which includes a circular guide plate 7 and a limiting wheel 8 arranged on the outer side of the guide plate. The outer peripheral surface of the circular guide plate 7 forms a supporting surface for the composite felt, and the limiting wheel 8 presses the composite felt and the outer peripheral surface of the circular guide plate 7 into fit; a fitting channel for the composite felt to pass through is formed between the limiting wheel 8 and the peripheral surface of the guide plate.

[0090] During use, the first feeding mechanism 1 conveys the first felt body, the first felt body passes through the glue coating mechanism, the glue coating mechanism coats hot melt adhesive on one side of the first felt body, the second feeding mechanism 6 conveys the second felt body, the second felt body covers the glue coated side of the first felt body, and a composite felt is obtained. The composite felt is cooled at room temperature, so that the hot melt adhesive between the first felt body and the second felt body condenses and solidifies. There is no need to solidify the glue by heating the aerogel felt, so as to avoid thermal damage to the composite felt and ensure that the composite felt has better thermal insulation performance.

[0091] The setting of the bonding mechanism can, on the one hand, cool and solidify the hot melt adhesive between the first felt body and the second felt body when the composite felt passes through the bonding mechanism; on the other hand, can further bond the first felt body and the second felt body when the composite felt passes through the bonding mechanism.

[0092] The glue coating mechanism includes a glue quantity adjustment component 5, and a gap is formed between the glue quantity adjustment component 5 and the glue coating component for the first felt body to pass through. The size of the gap is adjustable so as to facilitate the adjustment of the thickness of the hot melt adhesive coated on the first felt body and avoid the waste of hot melt adhesive. When in use, the first scraper is kept in a state of extending out of the first opening, and the second scraper is kept in a state of being deeply inserted into the first accommodating 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 a natural state.

[0093] When the glue coating thickness needs to be adjusted, in this embodiment, the second button 21 is pressed downward, and the second button 21 drives the second blade 22 to move downward. At this time, the second elastic telescopic structure in the second accommodating chamber 20 contracts, and the lower end of the second lock tongue 25 presses downward against the inclined surface in the second lock hole 26. The lock plate 19 moves backward, and the third spring 18 is compressed, so that the second lock tongue 25 moves downward through the avoidance chamber and enters the limit chamber. When the second lock tongue 25 passes through the avoidance chamber, the avoidance chamber of the first lock hole corresponds to the first lock tongue 17, and the first lock tongue 17 moves upward along the avoidance chamber. Under the reset action of the first elastic telescopic structure 15, the first scraper moves upward and extends into the first accommodating chamber 16; when the second lock tongue 25 passes through the avoidance chamber and reaches the limit chamber, the third spring 18 is reset, the lock plate 19 moves forward, the second lock tongue 25 and the limit chamber of the second lock hole 26 are limited up and down, and the second scraper extends out of the second accommodating chamber 20 and forms a gap for the first felt body to pass through with the glue roller 4, and the gap size adjustment is also completed.

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

[0095] In the above embodiment, the locking structure includes a locking plate that is slidingly arranged to guide forward and backward relative to the mounting shell, and a first locking hole and a second locking hole are respectively arranged on the locking plate. 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 can also be set to other structural forms.

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

[0097] The above embodiment also includes a fitting mechanism, which includes a circular guide plate and a limiting wheel arranged on the outer side of the circumference of the guide plate, the outer circumferential surface of the circular guide plate forms a support surface for the composite felt, and the limiting wheel presses the composite felt and the outer circumferential surface of the circular guide plate into fit; a fitting channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide plate; in other embodiments, the fitting mechanism may not be set.

Claims

1. A method for preparing a multilayer aerogel felt, characterized in that: The following steps are involved: S1: adding hot melt adhesive liquid to the glue coating device, the glue coating device comprises a glue coating roller and a glue tank, the glue tank is used to hold the hot melt adhesive liquid, and the glue coating roller is partially immersed in the glue tank; S2: The glue coating device further comprises a first feeding mechanism, a glue quantity adjusting component and a glue coating component. The first felt body is unwound by the first feeding mechanism, the first felt body is passed through a gap between the glue quantity adjusting component and the glue coating component, and the first felt body is roll-coated by a glue coating roller to prepare a pre-coated felt; S3: laminating the pre-coated felt prepared in step S2 with the second felt body conveyed by the second feeding mechanism in the gluing device to prepare a composite felt; S4: Cooling and solidifying the composite felt in step S3 to obtain.

2. The method for preparing a multilayer aerogel felt according to claim 1, characterized in that: In step S2, the thickness of the first felt body roller coating is 0.02-0.15 mm; in step S4, the cooling and curing time is 30 seconds to 2 minutes.

3. A glue coating device, characterized in that: Used in conjunction with the method for preparing the multilayer aerogel felt according to claim 1 or 2, the glue coating device comprises: A first feeding mechanism, the first feeding mechanism is configured to transfer a first felt body; A gluing mechanism, disposed close to the first feeding mechanism, for gluing one side of the first felt body; and The second feeding mechanism is arranged on the side of the gluing mechanism away from the first feeding mechanism, and the second feeding mechanism is used to convey the second felt body and make the second felt body cover the gluing side of the first felt body to obtain a composite felt; wherein, The glue coating mechanism includes a frame, a glue coating component, a glue supply component, and a glue quantity adjustment component; The glue coating component, glue supply component and glue quantity adjustment component are respectively arranged on the frame; The glue supply component contains molten hot melt glue; A gap is formed between the glue quantity regulating component and the glue coating component for the first felt body to pass through, and the size of the gap is adjustable to adjust the thickness of the hot melt adhesive layer coated on the first felt body.

4. The gluing device according to claim 3 is characterized in that: The glue supply component includes a glue groove fixedly arranged relative to the frame, and the glue coating component includes a glue coating roller rotatably arranged relative to the frame, and the bottom of the glue coating roller is immersed in the hot melt glue in the glue groove.

5. The gluing device according to claim 4, characterized in that: The glue quantity adjustment component comprises a mounting shell fixed on the frame, and a first accommodating cavity and a second accommodating cavity adjacent to each other are arranged in the mounting shell; A first scraper is provided in the first accommodating cavity for guiding upward and downward movement, and a first opening is provided at the bottom of the first accommodating cavity for the first scraper to extend out; A second scraper is arranged in the second accommodating cavity for guiding upward and downward movement, and a second opening is provided at the bottom of the second accommodating cavity for the second scraper to extend out; A locking structure is provided in the mounting shell, the locking structure comprising 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 accommodating cavity; the locking structure comprises a second state in which the first scraper is kept extending into the first accommodating cavity and the second scraper is kept extending 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 glue coating roller after the first scraper extends out of the mounting shell is different from the gap formed between the second scraper and the glue coating roller after the first scraper extends out of the mounting shell.

6. The gluing device according to claim 5, 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 convex rib that is adapted to slide with the guide of the first accommodating cavity, a first limiting block is fixed in the first accommodating cavity, the first convex rib is located above the first limiting block, and a first elastic telescopic structure is provided between the first convex rib 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 convex rib that is adapted to slide with the guide of the second accommodating cavity, a second limiting block is fixed in the second accommodating cavity, the second convex rib is located above the second limiting block, and a second elastic telescopic structure is provided between the second convex rib and the second limiting block.

7. The gluing device according to claim 6, characterized in that: The locking structure includes a locking plate that is slidingly arranged relative to the mounting shell, the locking plate is respectively provided with a first locking hole and a second locking hole, the first button is fixed with a first locking tongue corresponding to the first locking hole, and the second button is fixed with a second locking tongue corresponding to the second locking hole.

8. The gluing device according to claim 7, characterized in that: The first lock hole has the same structure as the second lock hole. The first lock hole includes a top pressure chamber, an avoidance chamber, and a limit chamber which are sequentially connected from top to bottom. The top pressure chamber includes an inclined surface which is inclined from top to bottom and from back to front. When the first lock tongue moves downward, the top pressure inclined surface causes the locking plate to move backward to facilitate the first lock tongue to move downward through the avoidance chamber and enter the limit chamber. The rear side wall of the limit chamber is located behind the rear side wall of the avoidance chamber, so that when the first lock tongue enters the limit chamber, the locking plate moves forward to cooperate with the upper and lower limit positions of the limit chamber.

9. The gluing device according to claim 8, characterized in that: A locking plate guide and limiting structure is fixed in the mounting shell, the guide and limiting structure is connected to a rear guide member that guides and slides with the rear end of the locking plate, and a front guide member that guides and 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 arranged in the rear guide groove; The front guide piece is fixed on the front side of the installation shell. The front guide piece is provided with a front guide groove with an opening facing backwards. The front guide groove is slidingly adapted to guide the front end of the locking piece.

10. The gluing device according to any one of claims 3 to 9, characterized in that: It also includes a fitting mechanism, which includes a circular guide plate and a limiting wheel arranged outside the circumference of the guide plate, the outer circumferential surface of the circular guide plate forms a supporting surface for the composite felt, and the limiting wheel presses the composite felt and the outer circumferential surface of the circular guide plate into fit; a fitting channel for the composite felt to pass through is formed between the limiting wheel and the circumferential surface of the guide plate.

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