Composite air pipe plate with fire-resistant and fireproof performance and preparation method of composite air pipe plate

Abstract

The composite air pipe plate comprises a plate body, multiple sets of screw holes are formed in the outer wall of the plate body, and sliding grooves are formed in one sides of the multiple sets of screw holes; the preparation method of the composite air duct plate with the fire-resistant and fireproof performance comprises the following steps that S1, the plate body structure layer is prepared, specifically, the outer-layer galvanized steel plate is treated, and the galvanized steel plate with the thickness being 0.5-1.0 mm is selected as an outer-layer material; by adopting the double-sealing design and combining with the spring and the adjustable connecting rod, it is ensured that the first sealing plug can be rapidly and tightly attached to the screw hole after being installed, water and moisture are effectively prevented from entering the screw hole, and the problem that a traditional sealing plug is aged or fails after being used for a long time is solved; the corrosion risk of the screws caused by the humid environment is greatly reduced, the long-term stability and reliability of the screws and connecting parts are ensured, and therefore the service life of the air pipe is prolonged, and faults and replacement frequency caused by corrosion are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air duct plates, and in particular to a composite air duct plate with fire resistance and fireproof performance and a preparation method thereof. Background Art

[0002] Air duct is a pipe system used for air delivery and distribution, mainly divided into composite air duct and inorganic air duct. Phenolic foam has excellent properties such as flame retardancy, heat resistance, low smoke and low toxicity, and is widely used in central air conditioning ventilation ducts, exterior wall insulation and other occasions.

[0003] In the prior art, air ducts are assembled by connecting air duct plates with screws. Before assembly, screw holes need to be preset on the air duct plates to facilitate subsequent installation. However, in specific usage environments, such as air ducts installed in basements, the usage environment is usually poorly ventilated and has high humidity. Moisture easily accumulates in the air. This humid environment can cause the screws in the screw holes to be corroded. Most of the prior art means install sealing plugs at the hole openings, but the sealing plugs may lose their effectiveness or age after a certain period of use, leading to corrosion problems in the screw holes. Therefore, it is necessary to propose a composite air duct plate with fire-resistant and fire-proof properties and a preparation method thereof to address the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a composite air duct plate with fire resistance and fireproof performance and a preparation method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A composite air duct plate with fire resistance and fireproof performance, including a plate body, wherein the outer wall of the plate body is provided with multiple groups of screw holes, and one side of the multiple groups of screw holes is provided with a slide groove, a sleeve is slidably connected in the slide groove, and a connecting rod is rotatably connected to the end of the sleeve, and the outer wall of the connecting rod is U-shaped, and a sealing plug 1 is fixedly connected to the end of the connecting rod, and a sealing plug 2 is sleeved on the outer wall of the sleeve, and the sealing plug 1 and the sealing plug 2 are both composed of two groups of sealing components, the two groups of sealing components are coaxially arranged, and the diameters are inconsistent, and an elastic component that drives the sealing plug 1 to tightly engage in the screw hole is installed in the slide groove.

[0007] Preferably, the elastic component comprises a sliding rod fixedly connected to the bottom of the sliding groove, one end of the sleeve is open, and the sleeve is slidably connected to the outside of the sliding rod.

[0008] Preferably, a spring is fixedly connected to the top of the sleeve, and the other end of the spring is fixedly connected to the end of the sliding rod.

[0009] Preferably, the outer wall of the sealing component of the sealing plug 1 close to the lower end is in close contact with the inner wall of the screw hole, and the sealing component of the sealing plug 2 close to the lower end is in close contact with the inner wall of the slide groove.

[0010] Preferably, the plate body consists of an outer layer, a heat insulating layer and an inner layer, the outer layer and the inner layer are located at the upper layer and the bottom layer respectively, and the heat insulating layer is embedded between the outer layer and the inner layer.

[0011] Preferably, the outer layer is made of galvanized steel plate with a thickness of 0.5-1.0 mm, the heat insulation layer is made of expanded perlite board with a thickness of 10-30 mm, and the inner layer is made of high-density glass fiber cloth with a thickness of 1-3 mm.

[0012] Preferably, the outer wall of the outer layer is sprayed with an anti-corrosion coating, and the outer wall of the anti-corrosion coating is sprayed with a waterproof material.

[0013] Preferably, the anti-corrosion coating is made of polyurethane material, and the waterproof material is made of acrylic material.

[0014] The present invention also provides a method for preparing a composite air duct plate with fire resistance and fireproof performance, comprising the following steps:

[0015] S1. Preparation of plate structure layer: Treatment of outer galvanized steel plate: Select galvanized steel plate with a thickness of 0.5-1.0mm as the outer layer material; firstly, pre-treat the surface of the galvanized steel plate to remove surface oil, impurities, etc., and use alkaline cleaning agent to clean it, then rinse it with clean water and dry it; then grind it on the surface to make the surface roughness meet certain requirements to enhance the adhesion of subsequent coatings, and clean the surface again after grinding;

[0016] Preparation of expanded perlite board for thermal insulation layer: Select expanded perlite as raw material and mix it evenly with an appropriate amount of binder; the binder can be inorganic binder such as cement, etc., and it is mixed in a certain ratio (such as expanded perlite: binder = 5-8:1); the mixed material is poured into a mold and pressed into an expanded perlite board with a thickness of 10-30mm through a pressure molding process. The molding pressure is controlled at 1-3MPa. After molding, it is cured under the conditions of temperature 20-30℃, humidity 50-70%, and curing time 24-48 hours;

[0017] Preparation of inner layer high-density glass fiber cloth: directly select high-density glass fiber cloth with a thickness of 1-3mm as the inner layer material, and check its quality before use to ensure that there are no defects such as damage and holes;

[0018] Composite board forming: Place the prepared expanded perlite board between two layers of galvanized steel plates to make the expanded perlite board and the galvanized steel plates fit closely together, then cover the innermost layer with high-density fiberglass cloth, and use a hot pressing composite process to composite the three layers of materials together; the hot pressing temperature is controlled at 150-200℃, the pressure is 0.5-1.5MPa, and the hot pressing time is determined according to the size of the board, generally 10-30 minutes, to obtain the initial finished board;

[0019] S2. Coating treatment

[0020] Anti-corrosion coating spraying: spray polyurethane anti-corrosion coating on the surface of the outer galvanized steel plate of the primary finished plate; first, mix the polyurethane coating to a suitable viscosity, add a proper amount of diluent, and control the amount of diluent to 5-10% of the total amount of coating; use a spray gun for spraying, keep the spraying distance at 20-30cm, and move the spray gun at a uniform speed to ensure uniform coating thickness. The thickness of the anti-corrosion coating is controlled at 0.1-0.3mm; dry it after spraying, the drying temperature is 60-80℃, and the drying time is 2-4 hours;

[0021] Waterproof material coating spraying: spray acrylic waterproof material on the surface of the anti-corrosion coating; acrylic paint also needs to be formulated, and an appropriate amount of curing agent and diluent can be added. The amount of curing agent is 2-5% of the total amount of coating, and the amount of diluent is 5-8%; the spraying process is similar to the anti-corrosion coating, and the coating thickness is controlled at 0.05-0.15mm. After spraying, it is naturally dried at room temperature for 24-48 hours;

[0022] S3. Sealing structure installation

[0023] Processing of screw holes and slide grooves: Process screw holes and slide grooves on the plate after coating treatment; determine the position and size of the screw holes according to the requirements of duct connection, use drilling equipment to drill holes, and the diameter of the screw holes is 5-10mm; process the slide groove on one side of the screw hole, the size of the slide groove is 10-15mm wide and 20-30mm deep. The slide groove is connected to the screw hole and the direction of the slide groove has a certain angle with the edge of the plate, which is convenient for the subsequent installation of sealing components;

[0024] S4. Sealing parts assembly

[0025] Preparation of sealing plug 1: The sealing plug 1 is composed of two sets of coaxial sealing components with different diameters; firstly, the inner sealing component is made of rubber material, and is formed into a shape that fits closely with the inner wall of the screw hole through a mold, and its diameter is 0.5-1mm smaller than the inner diameter of the screw hole, and its height is 5-10mm; the outer sealing component is made of silicone material, and is formed into a shape that wraps around the outer side of the inner sealing component, and its diameter is 2-5mm larger than the inner sealing component, and its height is 10-15mm, and the two layers of sealing components are bonded and fixed together;

[0026] Preparation of sealing plug 2: Sealing plug 2 is also composed of two sets of coaxial sealing components; the inner sealing component is made of soft plastic material and is formed into a shape that fits the inner wall of the slide groove. Its diameter is 0.3-0.8mm smaller than the inner diameter of the slide groove and its height is 15-20mm; the outer sealing component is made of rubber material and is formed into a shape that wraps the inner sealing component. Its diameter is 3-6mm larger than the inner sealing component and its height is 20-25mm. The two layers of sealing components are bonded and fixed;

[0027] Installation of sleeve, connecting rod and elastic component: put the sleeve on the sliding rod, fix the sliding rod at the bottom of the slide groove, and the sleeve can slide freely on the sliding rod; install the spring at the top of the sleeve, one end of the spring is fixed to the top of the sleeve, and the other end is fixed to the end of the sliding rod; rotate one end of the connecting rod to the end of the sleeve, the outer wall of the connecting rod is U-shaped, and the other end is fixed to the sealing plug one; then put the sealing plug two on the outer wall of the sleeve to ensure that the sealing component at the lower end of the sealing plug two fits with the inner wall of the slide groove.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention adopts a double sealing design, combined with a spring and an adjustable connecting rod, to ensure that the sealing plug can quickly and tightly fit into the screw hole after installation, effectively preventing water and moisture from entering the screw hole, avoiding the problem of aging or failure of traditional sealing plugs after long-term use, greatly reducing the corrosion risk of the screws caused by a humid environment, ensuring the long-term stability and reliability of the screws and connecting parts, thereby extending the service life of the air duct and reducing the failure and replacement frequency caused by corrosion.

[0030] 2. The plate body of the present invention adopts a three-layer structure of an outer layer of galvanized steel plate, a middle layer of expanded perlite plate, and an inner layer of high-density glass fiber cloth, and is sprayed with a polyurethane anti-corrosion layer and an acrylic waterproof layer, providing excellent corrosion resistance, heat insulation and fire resistance. Combined with a double sealing design, it effectively prevents moisture penetration and corrosion, reduces maintenance requirements, and significantly extends the service life of the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A structural schematic diagram of a composite air duct plate with fire resistance and fireproof performance and a preparation method thereof proposed by the present invention;

[0032] Figure 2 for Figure 1 Structural diagram.

[0033] Figure 3 for Figure 1 Section view.

[0034] Figure 4 for Figure 3 Schematic diagram of the structure of the middle sleeve and sealing plug.

[0035] Figure 5 for Figure 4 Section view.

[0036] In the figure: 1. plate body; 2. screw hole; 3. slide groove; 4. outer layer; 5. heat insulation layer; 6. inner layer; 7. sealing plug 1; 8. connecting rod; 9. sealing plug 2; 10. sleeve; 11. spring; 12. slide rod. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Reference Figure 1-5 A composite air duct plate with fire resistance and fireproof performance comprises a plate body 1, wherein the outer wall of the plate body 1 is provided with a plurality of screw holes 2, and one side of each of the plurality of screw holes 2 is provided with a slide groove 3, wherein a sleeve 10 is slidably connected in the slide groove 3, and a connecting rod 8 is rotatably connected at the end of the sleeve 10, and the outer wall of the connecting rod 8 is U-shaped, and a sealing plug 1 7 is fixedly connected at the end of the connecting rod 8, and a sealing plug 2 9 is sleeved on the outer wall of the sleeve 10, and the sealing plug 1 7 and the sealing plug 2 9 are both composed of two groups of sealing components, which are coaxially arranged and have different diameters, and an elastic component is installed in the slide groove 3 to drive the sealing plug 1 7 to be tightly engaged in the screw hole 2; the sealing plug 1 7 and the sealing plug 2 9 are composed of two groups of coaxial sealing components but with different diameters, thereby forming a double sealing barrier, and even if one group of sealing components fails slightly due to environmental factors such as temperature change, material aging, etc., the other group can still maintain good sealing performance, thereby effectively preventing moisture and air from entering the screw hole 2.

[0039] The elastic component includes a slide rod 12 fixedly connected to the bottom of the slide groove 3, one end of the sleeve 10 is open, the sleeve 10 is slidably connected to the outside of the slide rod 12, a spring 11 is fixedly connected to the top of the sleeve 10, the other end of the spring 11 is fixedly connected to the end of the slide rod 12, the outer wall of the sealing component at the lower end of the sealing plug 7 is in contact with the inner wall of the screw hole 2, and the sealing component at the lower end of the sealing plug 2 9 is in contact with the inner wall of the slide groove 3; the provided sealing plug 2 9 can seal the slide groove 3 to ensure that moisture does not corrode its internal components, and at the same time, the spring 11 can automatically adjust the pressure of the sealing plug 1 7 according to environmental changes, so that it always maintains close contact with the screw hole 2 and the inner wall of the slide groove 3. This dynamic adjustment function can effectively cope with the expansion and contraction caused by changes in temperature and humidity, thereby maintaining a good sealing effect, preventing moisture and humidity from entering the screw hole 2, and reducing the risk of corrosion.

[0040] The plate body 1 is composed of an outer layer 4, an insulating layer 5, and an inner layer 6. The outer layer 4 and the inner layer 6 are respectively located at the upper layer and the bottom layer. The insulating layer 5 is embedded between the outer layer 4 and the inner layer 6. The outer layer 4 is made of galvanized steel plate with a thickness of 0.5-1.0 mm. The insulating layer 5 is made of expanded perlite board with a thickness of 10-30 mm. The inner layer 6 is made of high-density fiberglass cloth with a thickness of 1-3 mm. The outer wall of the outer layer 4 is sprayed with an anti-corrosion coating, and the outer wall of the anti-corrosion coating is sprayed with a waterproof material. The anti-corrosion coating is made of polyurethane material, and the waterproof material is made of acrylic material.

[0041] In the present invention, when the device is specifically used: outer layer 4: galvanized steel plate is selected with a thickness of 0.5-1.0mm to ensure corrosion resistance and structural strength. Insulation layer 5: expanded perlite board is selected with a thickness of 10-30mm to provide good thermal insulation performance. Inner layer 6: high-density glass fiber cloth is selected with a thickness of 1-3mm to increase the fire resistance and structural stability of the air duct. Polyurethane material is used for the anti-corrosion coating, and acrylic material is used for the waterproof coating. The anti-corrosion coating and the waterproof coating form double protection, which significantly improves the durability of the air duct in a humid environment and ensures its long-term reliability under high temperature and humid conditions.

[0042] When installing the plate body 1, the connecting rod 8 can be pulled upwards. At this time, the spring 11 is in a stretched state, and the sealing plug 7 is pulled out from the screw hole 2. Then it is rotated to one side to avoid obstruction to the subsequent screwing of the screw. After installing the plate body 1, the connecting rod 8 is rotated until the sealing plug 7 overlaps the top of the screw hole 2, and then the hand is released. Under the elastic force of the spring 11, the sealing plug 7 is driven to slide into the screw hole 2. At this time, the sealing plug 2 9 is in contact with the inner wall of the slide groove 3 to achieve rapid and effective sealing. Through this design, the internal corrosion of the screw hole 2 caused by moisture and water penetration can be effectively reduced, the service life of the air duct is extended, and the need for later maintenance and replacement is reduced.

[0043] The present invention also provides a method for preparing a composite air duct plate with fire resistance and fireproof performance, which is characterized by comprising the following steps:

[0044] S1. Preparation of plate structure layer: Treatment of outer galvanized steel plate: Select galvanized steel plate with a thickness of 0.5-1.0mm as the outer layer material; firstly, pre-treat the surface of the galvanized steel plate to remove surface oil, impurities, etc., and use alkaline cleaning agent to clean it, then rinse it with clean water and dry it; then grind it on the surface to make the surface roughness meet certain requirements to enhance the adhesion of subsequent coatings, and clean the surface again after grinding;

[0045] Preparation of expanded perlite board for thermal insulation layer: Select expanded perlite as raw material and mix it evenly with an appropriate amount of binder; the binder can be inorganic binder such as cement, etc., and it is mixed in a certain ratio (such as expanded perlite: binder = 5-8:1); the mixed material is poured into a mold and pressed into an expanded perlite board with a thickness of 10-30mm through a pressure molding process. The molding pressure is controlled at 1-3MPa. After molding, it is cured under the conditions of temperature 20-30℃, humidity 50-70%, and curing time 24-48 hours;

[0046] Preparation of inner layer high-density glass fiber cloth: directly select high-density glass fiber cloth with a thickness of 1-3mm as the inner layer material, and check its quality before use to ensure that there are no defects such as damage and holes;

[0047] Composite board forming: Place the prepared expanded perlite board between two layers of galvanized steel plates to make the expanded perlite board and the galvanized steel plates fit closely together, then cover the innermost layer with high-density fiberglass cloth, and use a hot pressing composite process to composite the three layers of materials together; the hot pressing temperature is controlled at 150-200℃, the pressure is 0.5-1.5MPa, and the hot pressing time is determined according to the size of the board, generally 10-30 minutes, to obtain the initial finished board;

[0048] S2. Coating treatment

[0049] Anti-corrosion coating spraying: spray polyurethane anti-corrosion coating on the surface of the outer galvanized steel plate of the primary finished plate; first, mix the polyurethane coating to a suitable viscosity, add a proper amount of diluent, and control the amount of diluent to 5-10% of the total amount of coating; use a spray gun for spraying, keep the spraying distance at 20-30cm, and move the spray gun at a uniform speed to ensure uniform coating thickness. The thickness of the anti-corrosion coating is controlled at 0.1-0.3mm; dry it after spraying, the drying temperature is 60-80℃, and the drying time is 2-4 hours;

[0050] Waterproof material coating spraying: spray acrylic waterproof material on the surface of the anti-corrosion coating; acrylic paint also needs to be formulated, and an appropriate amount of curing agent and diluent can be added. The amount of curing agent is 2-5% of the total amount of coating, and the amount of diluent is 5-8%; the spraying process is similar to the anti-corrosion coating, and the coating thickness is controlled at 0.05-0.15mm. After spraying, it is naturally dried at room temperature for 24-48 hours;

[0051] S3. Sealing structure installation

[0052] Processing of screw holes and slide grooves: Process screw holes and slide grooves on the plate after coating treatment; determine the position and size of the screw holes according to the requirements of duct connection, use drilling equipment to drill holes, and the diameter of the screw holes is 5-10mm; process the slide groove on one side of the screw hole, the size of the slide groove is 10-15mm wide and 20-30mm deep. The slide groove is connected to the screw hole and the direction of the slide groove has a certain angle with the edge of the plate, which is convenient for the subsequent installation of sealing components;

[0053] S4. Sealing parts assembly

[0054] Preparation of sealing plug 1: The sealing plug 1 is composed of two sets of coaxial sealing components with different diameters; firstly, the inner sealing component is made of rubber material, and is formed into a shape that fits closely with the inner wall of the screw hole through a mold, and its diameter is 0.5-1mm smaller than the inner diameter of the screw hole, and its height is 5-10mm; the outer sealing component is made of silicone material, and is formed into a shape that wraps around the outer side of the inner sealing component, and its diameter is 2-5mm larger than the inner sealing component, and its height is 10-15mm, and the two layers of sealing components are bonded and fixed together;

[0055] Preparation of sealing plug 2: Sealing plug 2 is also composed of two sets of coaxial sealing components; the inner sealing component is made of soft plastic material and is formed into a shape that fits the inner wall of the slide groove. Its diameter is 0.3-0.8mm smaller than the inner diameter of the slide groove and its height is 15-20mm; the outer sealing component is made of rubber material and is formed into a shape that wraps the inner sealing component. Its diameter is 3-6mm larger than the inner sealing component and its height is 20-25mm. The two layers of sealing components are bonded and fixed;

[0056] Installation of sleeve, connecting rod and elastic component: put the sleeve on the sliding rod, fix the sliding rod at the bottom of the slide groove, and the sleeve can slide freely on the sliding rod; install the spring at the top of the sleeve, one end of the spring is fixed to the top of the sleeve, and the other end is fixed to the end of the sliding rod; rotate one end of the connecting rod to the end of the sleeve, the outer wall of the connecting rod is U-shaped, and the other end is fixed to the sealing plug one; then put the sealing plug two on the outer wall of the sleeve to ensure that the sealing component at the lower end of the sealing plug two fits with the inner wall of the slide groove.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A composite air duct plate with fire resistance and fireproof performance, comprising a plate body (1), characterized in that: The outer wall of the plate body (1) is provided with a plurality of screw holes (2), one side of each of the plurality of screw holes (2) is provided with a slide groove (3), a sleeve (10) is slidably connected in the slide groove (3), the end of the sleeve (10) is rotatably connected with a connecting rod (8), the outer wall of the connecting rod (8) is U-shaped, the end of the connecting rod (8) is fixedly connected with a sealing plug 1 (7), the outer wall of the sleeve (10) is sleeved with a sealing plug 2 (9), the sealing plug 1 (7) and the sealing plug 2 (9) are both composed of two groups of sealing components, the two groups of sealing components are coaxially arranged, and the diameters are inconsistent with each other, and an elastic component is installed in the slide groove (3) to drive the sealing plug 1 (7) to tightly engage in the screw hole (2).

2. The composite air duct plate with fire resistance and fireproof performance according to claim 1, characterized in that: The elastic component comprises a sliding rod (12) fixedly connected to the bottom of the sliding groove (3); one end of the sleeve (10) is open, and the sleeve (10) is slidably connected to the outside of the sliding rod (12).

3. The composite air duct plate with fire resistance and fireproofing performance according to claim 2, characterized in that: A spring (11) is fixedly connected to the top of the sleeve (10), and the other end of the spring (11) is fixedly connected to the end of the slide rod (12).

4. The composite air duct plate with fire resistance and fireproofing performance according to claim 3, characterized in that: The outer wall of the sealing component at the lower end of the sealing plug 1 (7) is in close contact with the inner wall of the screw hole (2), and the sealing component at the lower end of the sealing plug 2 (9) is in close contact with the inner wall of the slide groove (3).

5. The composite air duct plate with fire resistance and fireproofing performance according to claim 4, characterized in that: The plate body (1) is composed of an outer layer (4), a heat insulating layer (5), and an inner layer (6); the outer layer (4) and the inner layer (6) are located at the upper layer and the bottom layer respectively; and the heat insulating layer (5) is embedded between the outer layer (4) and the inner layer (6).

6. The composite air duct plate with fire resistance and fireproofing performance according to claim 5, characterized in that: The outer layer (4) is made of galvanized steel plate with a thickness of 0.5-1.0 mm, the heat insulation layer (5) is made of expanded perlite board with a thickness of 10-30 mm, and the inner layer (6) is made of high-density glass fiber cloth with a thickness of 1-3 mm.

7. The composite air duct plate with fire resistance and fireproofing performance according to claim 6, characterized in that: The outer wall of the outer layer (4) is sprayed with an anti-corrosion coating, and the outer wall of the anti-corrosion coating is sprayed with a waterproof material.

8. The composite air duct plate with fire resistance and fireproofing performance according to claim 7, characterized in that: The anti-corrosion coating is made of polyurethane material, and the waterproof material is made of acrylic material.

9. A method for preparing a composite air duct plate with fire resistance and fireproof performance, characterized in that: The following steps are involved: S1. Preparation of plate structure layer: Treatment of outer galvanized steel plate: Select galvanized steel plate with a thickness of 0.5-1.0mm as the outer layer material; firstly, pre-treat the surface of the galvanized steel plate to remove surface oil, impurities, etc., and use alkaline cleaning agent to clean it, then rinse it with clean water and dry it; then grind it on the surface to make the surface roughness meet certain requirements to enhance the adhesion of subsequent coatings, and clean the surface again after grinding; Preparation of expanded perlite board for thermal insulation layer: Select expanded perlite as raw material and mix it evenly with an appropriate amount of binder; the binder can be an inorganic binder such as cement, etc., and it is mixed in a certain ratio (such as expanded perlite: binder = 5-8:1); the mixed material is poured into a mold and pressed into an expanded perlite board with a thickness of 10-30mm through a pressure molding process. The molding pressure is controlled at 1-3MPa. After molding, it is cured under the conditions of temperature 20-30℃, humidity 50-70%, and curing time 24-48 hours; Preparation of inner layer high-density glass fiber cloth: directly select high-density glass fiber cloth with a thickness of 1-3mm as the inner layer material, and check its quality before use to ensure that there are no defects such as damage and holes; Composite board forming: Place the prepared expanded perlite board between two layers of galvanized steel plates to make the expanded perlite board and the galvanized steel plates fit closely together, then cover the innermost layer with high-density fiberglass cloth, and use a hot pressing composite process to composite the three layers of materials together; the hot pressing temperature is controlled at 150-200℃, the pressure is 0.5-1.5MPa, and the hot pressing time is determined according to the size of the board, generally 10-30 minutes, to obtain the initial finished board; S2. Coating treatment Anti-corrosion coating spraying: spray polyurethane anti-corrosion coating on the surface of the outer galvanized steel plate of the primary finished plate; first, mix the polyurethane coating to a suitable viscosity, add a proper amount of diluent, and control the amount of diluent to 5-10% of the total amount of coating; use a spray gun for spraying, keep the spraying distance at 20-30cm, and move the spray gun at a uniform speed to ensure uniform coating thickness. The thickness of the anti-corrosion coating is controlled at 0.1-0.3mm; dry it after spraying, the drying temperature is 60-80℃, and the drying time is 2-4 hours; Waterproof material coating spraying: spray acrylic waterproof material on the surface of the anti-corrosion coating; acrylic paint also needs to be formulated, and an appropriate amount of curing agent and diluent can be added. The amount of curing agent is 2-5% of the total amount of coating, and the amount of diluent is 5-8%; the spraying process is similar to the anti-corrosion coating, and the coating thickness is controlled at 0.05-0.15mm. After spraying, it is naturally dried at room temperature for 24-48 hours; S3. Sealing structure installation Processing of screw holes and slide grooves: Process screw holes and slide grooves on the plate after coating treatment; determine the position and size of the screw holes according to the requirements of duct connection, use drilling equipment to drill holes, and the diameter of the screw holes is 5-10mm; process the slide groove on one side of the screw hole, the size of the slide groove is 10-15mm wide and 20-30mm deep. The slide groove is connected to the screw hole and the direction of the slide groove has a certain angle with the edge of the plate, which is convenient for the subsequent installation of sealing components; S4. Sealing parts assembly Preparation of sealing plug 1: The sealing plug 1 is composed of two sets of coaxial sealing components with different diameters; firstly, the inner sealing component is made of rubber material, and is formed into a shape that fits closely with the inner wall of the screw hole through a mold, and its diameter is 0.5-1mm smaller than the inner diameter of the screw hole, and its height is 5-10mm; the outer sealing component is made of silicone material, and is formed into a shape that wraps around the outer side of the inner sealing component, and its diameter is 2-5mm larger than the inner sealing component, and its height is 10-15mm, and the two layers of sealing components are bonded and fixed together; Preparation of sealing plug 2: Sealing plug 2 is also composed of two sets of coaxial sealing components; the inner sealing component is made of soft plastic material and is formed into a shape that fits the inner wall of the slide groove. Its diameter is 0.3-0.8mm smaller than the inner diameter of the slide groove and its height is 15-20mm; the outer sealing component is made of rubber material and is formed into a shape that wraps the inner sealing component. Its diameter is 3-6mm larger than the inner sealing component and its height is 20-25mm. The two layers of sealing components are bonded and fixed; Installation of sleeve, connecting rod and elastic component: put the sleeve on the sliding rod, fix the sliding rod at the bottom of the slide groove, and the sleeve can slide freely on the sliding rod; install the spring at the top of the sleeve, one end of the spring is fixed to the top of the sleeve, and the other end is fixed to the end of the sliding rod; rotate one end of the connecting rod to the end of the sleeve, the outer wall of the connecting rod is U-shaped, and the other end is fixed to the sealing plug one; then put the sealing plug two on the outer wall of the sleeve to ensure that the sealing component at the lower end of the sealing plug two fits with the inner wall of the slide groove.

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