Inorganic fire-retardant board and method for producing the same

Abstract

This invention discloses an inorganic flame-retardant board and its production method, relating to the field of inorganic flame-retardant board production technology. Specifically, it includes fibers and a flame retardant, which are fused together by an adhesive and water in a 3:1 ratio. The fibers comprise 30-35 parts by weight of glass fiber, 20-25 parts by weight of wood fiber, and 15-25 parts by weight of seaweed fiber. The flame retardant comprises 8-12 parts by weight of magnesium oxide and 6-10 parts by weight of magnesium sulfate. The adhesive comprises 30-40 parts by weight of epoxy resin. The inorganic flame-retardant board of this invention incorporates seaweed fiber, ensuring the board has a certain moisture absorption function, thereby directly alleviating indoor humidity and regulating indoor humidity. Simultaneously, it gives the board high antibacterial properties, preventing corrosion from harsh outdoor environments. Furthermore, the epoxy resin completes the fusion of the various raw materials, achieving fast curing speed, high electrical insulation performance, high corrosion resistance, and high environmental resistance.

Description

Technical Field

[0001] This invention relates to the field of inorganic flame retardant board production technology, and in particular to an inorganic flame retardant board and its production method. Background Technology

[0002] Inorganic flame-retardant boards are flame-retardant material boards made from inorganic materials. Unlike traditional organic flame-retardant materials, inorganic flame-retardant boards do not contain organic components, thus possessing advantages such as fire resistance, high temperature resistance, pressure resistance, shock resistance, heat insulation, and sound insulation. Inorganic flame-retardant boards are commonly used in construction, shipbuilding, and power industries to enhance the fire resistance of buildings and protect equipment. Furthermore, because inorganic flame-retardant boards do not contain organic substances, they do not release toxic or harmful gases or smoke in the event of a fire, effectively reducing the harm caused by fire to humans and the environment. In the market, inorganic flame-retardant boards vary in thickness, density, and fire resistance rating; the appropriate specifications should be selected based on the specific application scenario and requirements.

[0003] A search revealed Chinese patent application CN2018213580761, which discloses an environmentally friendly, paint-free, waterproof, and fireproof decorative board. This board includes an upper layer and a lower layer, which are interlocked. Both the upper and lower layers have an inorganic flame-retardant magnesium oxide board bonded to their outer surfaces. A honeycomb aluminum foil is adhered to the top of the inorganic flame-retardant magnesium oxide board, and a thin wood decorative layer is adhered to the outer surface of the honeycomb aluminum foil. A retaining strip is fused to one end of each of the upper and lower layers. The aforementioned environmentally friendly, paint-free, waterproof, and fireproof decorative board has the following shortcomings:

[0004] Although the overall structure achieves high temperature resistance, fireproof and waterproof functions, the overall board adopts a stacked structure and uses honeycomb aluminum foil inside. Its surface is prone to corrosion in harsh environments. Therefore, there is an urgent need for an inorganic flame-retardant board and its production method. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an inorganic flame-retardant board and its production method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An inorganic flame-retardant board includes fibers and a flame retardant, wherein the fibers and the flame retardant are fused together by an adhesive and water, and the ratio of water to adhesive is 3:1.

[0008] Preferably, the fiber comprises the following components by weight: 30-35 parts glass fiber, 20-25 parts wood fiber, and 15-25 parts seaweed fiber.

[0009] Further: the flame retardant comprises the following components by weight: 8-12 parts magnesium oxide and 6-10 parts magnesium sulfate.

[0010] Based on the aforementioned scheme: the adhesive comprises 30-40 parts by weight of epoxy resin and 100-120 parts by weight of water.

[0011] A method for producing an inorganic flame-retardant board includes the following steps:

[0012] S1: Fiber preparation: Glass fiber, wood fiber and seaweed fiber are cut into strips with a length of 150-200mm using a cutting machine. The glass fiber, wood fiber and seaweed fiber are then put into a pulverizer in sequence to make fiber blocks with a length of 1-3mm and a width of 2-4mm. The various fiber blocks are then stirred and mixed to obtain mixed fibers.

[0013] S2: Mixing and stirring: Mixed fibers, magnesium oxide, magnesium sulfate and water are introduced into a mixing tank and stirred at a speed of 30 r / s for 45 min at a temperature of 15-30℃. During this process, epoxy resin is added through a feeder to obtain a mixed material.

[0014] S3: Wood board blank production: After the mixture is cooled and dried, it is placed in a wood mold for pre-pressing treatment. The aging time of the blank is 20-40 minutes, the unit pressure is 0.8-1.2 MPa, and the processing time is 30-60 minutes.

[0015] S4: Cold pressing: The pre-pressed wooden board blank is placed into a cold press for cold pressing. The cold pressing pressure is 2-3 MPa.

[0016] S5: Board drying: Place the cold-pressed board into the steam drying chamber, and use steam to promote the evaporation of moisture from the board, so that the board is dried. The drying time is 1-2 hours and the drying temperature is 45-60℃.

[0017] S6: Plate polishing: The dried plate is placed on a grinding wheel machine and polished with 120-mesh and 320-mesh grinding wheels to complete the production of inorganic flame retardant board.

[0018] As a further embodiment of the present invention: the feeder includes a fixed plate, and an installation cylinder is provided on the outer wall of the front side of the fixed plate. An intermittent mechanism is provided inside the installation cylinder. A bracket is provided on the outer wall of the bottom side of the fixed plate. A U-shaped limiting plate is welded to the bottom of the bracket. Guide rings are welded to the top and bottom of the U-shaped limiting plate. A spring is welded to the inner wall of the top of the U-shaped limiting plate. A guide nozzle is provided at the bottom end of the intermittent mechanism.

[0019] Meanwhile, the intermittent mechanism includes a guide rod, a guide tube, a rotating shaft, a guide shaft, a ratchet, a guide plate, a guide shaft, a guide cylinder, a limiting post, a rotating plate, a pawl, a connecting shaft, and a torsion spring;

[0020] The rotating shaft is connected to the middle side of the fixed plate via a bearing;

[0021] The guide shaft is located at the center of the inner wall of the mounting cylinder;

[0022] The ratchet is located on the end circumference of the guide shaft;

[0023] The rotating plate is rotatably connected to the circumference of the end of the guide shaft;

[0024] The guide plate is located at the end of the rotating shaft, and a guide protrusion is provided at one end of the guide plate.

[0025] As a preferred embodiment of the present invention: the limiting post is disposed on one side of the rotating plate, and the guide protrusion is adapted to the limiting post;

[0026] The connecting shaft is located on one side of the top of the rotating plate;

[0027] The pawl is rotatably connected to the circumference of the connecting shaft, and the ratchet is adapted to the pawl;

[0028] The two ends of the torsion spring are fixed to the end of the connecting shaft and one side of the pawl, respectively.

[0029] The guide tube is welded to one side of the top of the rotating plate;

[0030] The guide rod is rotatably connected to one end of the guide cylinder;

[0031] The guide shaft is located at the bottom U-end of the guide rod;

[0032] The top of the catheter is rotatably connected to the circumference of the guide shaft, and the catheter is slidably connected inside the guide ring. The nozzle is connected to the bottom of the catheter via a thread.

[0033] Meanwhile, a fixing ring is sleeved on the outer circumference of the middle section of the conduit, and a spring is welded to the top outer wall of the fixing ring. The top outer wall of the spring is welded to the top inner wall of the U-shaped limiting plate.

[0034] As a preferred embodiment of the present invention: a guide pipe is provided on the outer wall of one side of the bottom of the fixing plate, and a conveying hose is provided at one end of the guide pipe, and one end of the conveying hose is connected to one side of the circumference of the guide pipe by a thread.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. An inorganic flame-retardant board and its production method, wherein the inorganic flame-retardant board contains seaweed fiber to ensure that the board has a certain moisture absorption function, thereby directly alleviating indoor humidity and playing a role in regulating indoor humidity. At the same time, the board has high antibacterial properties, preventing the board from being corroded by harsh outdoor environments. Furthermore, the various raw materials are fused together through epoxy resin, achieving functions such as fast curing speed, high electrical insulation performance, high corrosion resistance, and high environmental resistance.

[0037] 2. This inorganic flame-retardant board and its production method involve connecting a rotating shaft to a motor via a coupling. Starting the motor causes the rotating shaft to rotate, which in turn drives a guide plate to rotate. During rotation, the guide plate pushes a limiting post, causing the rotating plate to rotate and causing a guide rod on one side of the guide tube at one end of the rotating plate to swing, resulting in vertical sliding of the guide tube within the guide ring. Simultaneously, during the rotation of the rotating plate, a pawl on the circumference of the guide shaft at one end of the rotating plate also rotates faster than the guide plate. When the spring returns to its original position, the pawl engages with the ratchet groove of the ratchet wheel via a torsion spring, preventing the ratchet from rotating. This facilitates the intermittent addition of epoxy resin to the mixing tank, improving the mixing quality of various raw materials, ensuring uniform fusion of epoxy resin and various raw materials, and increasing the pass rate of subsequent board processing.

[0038] 3. In this inorganic flame-retardant plate and its manufacturing method, when the conduit slides within the guide ring, the spring completes its extension and retraction, promoting stable repositioning of the conduit and ensuring the smoothness of intermittent sliding of the conduit.

[0039] 4. In this inorganic flame-retardant board and its production method, when the conduit slides vertically up and down within the guide ring, the conduit pulls the delivery hose. When the nozzle is slid to the bottom, the delivery hose is pulled to its limit, and the connection between the delivery hose and the guide pipe is squeezed under the pull of the conduit, achieving a temporary seal. This ensures intermittent discharge of epoxy resin, promotes the mixing effect of various raw materials in the mixing tank, and improves the various properties of the inorganic flame-retardant board. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the production method of an inorganic flame-retardant board proposed in this invention;

[0041] Figure 2 This is a schematic diagram of the main structure of the feeder in the production method of inorganic flame retardant board proposed in this invention;

[0042] Figure 3 This is a side view of the feeding machine in the production method of an inorganic flame-retardant board proposed in this invention.

[0043] Figure 4 This is a schematic diagram of the intermittent mechanism of the feeder in the production method of an inorganic flame retardant board proposed in this invention;

[0044] Figure 5 This is a partial structural diagram of the feeder in the production method of an inorganic flame-retardant board proposed in this invention.

[0045] In the diagram: 1. Fixing plate; 2. Mounting cylinder; 3. Guide rod; 4. Guide tube; 5. Bracket; 6. Conveying hose; 7. U-shaped limiting plate; 8. Guide ring; 9. Fixing ring; 10. Spring; 11. Conduit; 12. Rotating shaft; 13. Guide shaft; 14. Ratchet; 15. Guide plate; 16. Guide shaft; 17. Guide cylinder; 18. Limiting post; 19. Rotating plate; 20. Pawl; 21. Connecting shaft; 22. Torsion spring. Detailed Implementation

[0046] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0047] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0048] Example 1:

[0049] An inorganic flame-retardant board includes fibers and a flame retardant, wherein the fibers and the flame retardant are fused together by an adhesive and water, and the ratio of water to adhesive is 3:1.

[0050] The fiber composition includes the following components by weight: 30-35 parts glass fiber, 20-25 parts wood fiber, and 15-25 parts seaweed fiber.

[0051] The flame retardant comprises the following components by weight: 8-12 parts magnesium oxide and 6-10 parts magnesium sulfate;

[0052] The adhesive comprises 30-40 parts by weight of epoxy resin;

[0053] The water comprises 100-120 parts by weight;

[0054] A method for producing an inorganic flame-retardant board, such as Figure 1 As shown, it includes the following steps:

[0055] S1: Fiber preparation: Glass fiber, wood fiber and seaweed fiber are cut into strips with a length of 150-200mm using a cutting machine. The glass fiber, wood fiber and seaweed fiber are then put into a pulverizer in sequence to make fiber blocks with a length of 1-3mm and a width of 2-4mm. The various fiber blocks are then stirred and mixed to obtain mixed fibers.

[0056] S2: Mixing and stirring: Mixed fibers, magnesium oxide, magnesium sulfate and water are introduced into a mixing tank and stirred at a speed of 30 r / s for 45 min at a temperature of 15-30℃. During this process, epoxy resin is added through a feeder to obtain a mixed material.

[0057] S3: Wood board blank production: After the mixture is cooled and dried, it is placed in a wood mold for pre-pressing treatment. The aging time of the blank is 20-40 minutes, the unit pressure is 0.8-1.2 MPa, and the processing time is 30-60 minutes.

[0058] S4: Cold pressing: The pre-pressed wooden board blank is placed into a cold press for cold pressing. The cold pressing pressure is 2-3 MPa.

[0059] S5: Board drying: Place the cold-pressed board into the steam drying chamber, and use steam to promote the evaporation of moisture from the board, so that the board is dried. The drying time is 1-2 hours and the drying temperature is 45-60℃.

[0060] S6: Plate polishing: The dried plate is placed on a grinding wheel machine and polished with 120-mesh and 320-mesh grinding wheels to complete the production of inorganic flame retardant board.

[0061] Example 2:

[0062] A method for producing an inorganic flame-retardant board, such as Figure 2-5 As shown, in order to promote the uniform and thorough integration of epoxy resin with various raw materials, the feeder includes a fixed plate 1, and an installation cylinder 2 is fixed to the outer wall of the front side of the fixed plate 1 by bolts. An intermittent mechanism is provided inside the installation cylinder 2. A bracket 5 is fixed to the outer wall of the bottom side of the fixed plate 1 by bolts. A U-shaped limiting plate 7 is welded to the bottom of the bracket 5. Guide rings 8 are welded to the top and bottom of the U-shaped limiting plate 7. A spring 10 is welded to the inner wall of the top of the U-shaped limiting plate 7. A guide nozzle is threaded to the bottom end of the intermittent mechanism.

[0063] To facilitate the intermittent addition of epoxy resin to the mixing tank and improve the mixing quality of various raw materials; such as Figure 2-5 As shown, the intermittent mechanism includes a guide rod 3, a guide tube 11, a rotating shaft 12, a guide shaft 13, a ratchet 14, a guide plate 15, a guide shaft 16, a guide cylinder 17, a limiting post 18, a rotating plate 19, a pawl 20, a connecting shaft 21, and a torsion spring 22.

[0064] The rotating shaft 12 is connected to the middle side of the fixed plate 1 via a bearing;

[0065] Guide shaft 13 is threadedly connected to the center of the inner wall of mounting cylinder 2;

[0066] Ratchet 14 is threadedly connected to the end circumference of guide shaft 13;

[0067] Rotating plate 19 is rotatably connected to the circumference of the end of the guide shaft 13;

[0068] Guide plate 15 is threaded to the end of rotating shaft 12, and one end of guide plate 15 is provided with a guide protrusion;

[0069] The limiting post 18 is threaded to one side of the rotating plate 19, and the guide protrusion is adapted to the limiting post 18.

[0070] Connecting shaft 21 is threaded to one side of the top of rotating plate 19;

[0071] Pawl 20 is rotatably connected to the circumference of connecting shaft 21, and ratchet 14 is adapted to pawl 20;

[0072] Torsion spring 22, with its two ends fixed to the end of connecting shaft 21 and one side of pawl 20, respectively;

[0073] Guide cylinder 17 is welded to one side of the top of rotating plate 19;

[0074] Guide rod 3 is rotatably connected to one end of guide cylinder 17;

[0075] Guide shaft 16 is threaded to the bottom U end of guide rod 3;

[0076] The catheter 11 has its top end rotatably connected to the circumference of the guide shaft 16, and the catheter 11 is slidably connected to the guide ring 8. The guide nozzle is connected to the bottom end of the catheter 11 by a thread.

[0077] To facilitate the stable repositioning of catheter 11; such as Figure 3 As shown, a fixing ring 9 is sleeved on the outer circumference of the middle section of the conduit 11, and a spring 10 is welded to the top outer wall of the fixing ring 9. The top outer wall of the spring 10 is welded to the top inner wall of the U-shaped limiting plate 7. When the conduit 11 slides in the guide ring 8, the spring 10 completes the extension and retraction, which promotes the stable reset of the conduit 11 and ensures the smoothness of the intermittent sliding of the conduit 11.

[0078] During operation, the rotating shaft 12 is connected to the motor via a coupling, and the motor is started. The motor drives the rotating shaft 12 to rotate, which in turn drives the guide plate 15 to rotate. During the rotation of the guide plate 15, the guide plate 15 pushes the limiting post 18, causing the rotating plate 19 to rotate. This causes the guide rod 3 on one side of the guide cylinder 17 at one end of the rotating plate 19 to swing, causing the guide tube 11 to slide vertically within the guide ring 8. During the rotation of the rotating plate 19, the pawl 20 on the circumference of the guide shaft 16 at one end of the rotating plate 19 also rotates. The rotation speed of the pawl 20 is faster than that of the guide plate 15. When the spring 10 completes its reset, it is engaged in the ratchet groove of the ratchet wheel 14 by the torsion spring 22, and the ratchet wheel 14 does not rotate. This promotes the intermittent addition of epoxy resin to the mixing tank, improves the mixing quality of various raw materials, ensures the uniform fusion of epoxy resin and various raw materials, and improves the pass rate of subsequent board processing.

[0079] To achieve uniform intermittent discharge of epoxy resin; such as Figure 2 As shown, the bottom side outer wall of the fixed plate 1 is connected to a guide pipe 4 by a thread, and one end of the guide pipe 4 is connected to a conveying hose 6 by a thread. One end of the conveying hose 6 is connected to one side of the circumference of the conduit 11 by a thread. When the conduit 11 slides vertically up and down in the guide ring 8, the conduit 11 will pull the conveying hose 6. When the guide nozzle is slid to the bottom, the conveying hose 6 is pulled to the limit, and the connection between the conveying hose 6 and the guide pipe 4 will be squeezed under the pull of the conduit 11 to achieve a temporary seal. This ensures the intermittent discharge of epoxy resin, promotes the mixing effect of various raw materials in the mixing tank, and improves the various properties of the inorganic flame retardant board.

[0080] In this embodiment, the rotating shaft 12 is connected to the motor via a coupling, and the motor is started. The motor drives the rotating shaft 12 to rotate, which in turn drives the guide plate 15 to rotate. During the rotation, the rotating guide plate 15 pushes the limiting post 18, causing the rotating plate 19 to rotate. This causes the guide rod 3 on one side of the guide cylinder 17 at one end of the rotating plate 19 to swing, which in turn causes the guide tube 11 to slide vertically within the guide ring 8. During the rotation of the rotating plate 19, the pawl 20 on the circumference of the guide shaft 16 at one end of the rotating plate 19 also rotates. The rotation speed of the pawl 20 is faster than that of the guide plate 15. When the spring 10 completes its reset, it is locked into the ratchet groove of the ratchet wheel 14 by the torsion spring 22. The ratchet wheel 14 does not rotate, thereby promoting the intermittent addition of epoxy resin to the mixing tank. When the guide tube 11 slides within the guide ring 8, the spring 10 completes its extension and retraction, promoting the stable reset of the guide tube 11 and ensuring the smoothness of the intermittent sliding of the guide tube 11.

[0081] When the conduit 11 slides vertically up and down within the guide ring 8, the conduit 11 will pull the delivery hose 6. When the nozzle is slid to the bottom, the delivery hose 6 is pulled to its limit, and the connection between the delivery hose 6 and the guide pipe 4 will be squeezed under the pull of the conduit 11 to achieve a temporary seal, thus ensuring intermittent epoxy resin discharge.

[0082] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An inorganic flame-retardant board, comprising fibers and a flame retardant, characterized in that, The fibers and flame retardant are fused together by an adhesive and water, with the ratio of water to adhesive being 3:

1. The production method of this inorganic flame-retardant board includes the following steps: S1: Fiber preparation: Glass fiber, wood fiber and seaweed fiber are cut into strips with a length of 150-200mm using a cutting machine. The glass fiber, wood fiber and seaweed fiber are then put into a pulverizer in sequence to make fiber blocks with a length of 1-3mm and a width of 2-4mm. The various fiber blocks are then stirred and mixed to obtain mixed fibers. S2: Mixing and stirring: Mixed fibers, magnesium oxide, magnesium sulfate and water are introduced into a mixing tank and stirred at a speed of 30 r / s for 45 min at a temperature of 15-30℃. During this process, epoxy resin is added through a feeder to obtain a mixed material. S3: Wood board blank production: After the mixture is cooled and dried, it is placed in a wood mold for pre-pressing treatment. The aging time of the blank is 20-40 minutes, the unit pressure is 0.8-1.2 MPa, and the processing time is 30-60 minutes. S4: Cold pressing: The pre-pressed wooden board blank is placed into a cold press for cold pressing. The cold pressing pressure is 2-3 MPa. S5: Board drying: Place the cold-pressed board into the steam drying chamber, and use steam to promote the evaporation of moisture from the board, so that the board is dried. The drying time is 1-2 hours and the drying temperature is 45-60℃. S6: Plate polishing: The dried plate is placed on a grinding wheel machine and the surface of the plate is polished using 120-mesh and 320-mesh grinding wheels to complete the production of inorganic flame retardant board; The feeder includes a fixed plate (1), and an installation cylinder (2) is provided on the outer wall of the front side of the fixed plate (1). An intermittent mechanism is provided inside the installation cylinder (2). A bracket (5) is provided on the outer wall of the bottom side of the fixed plate (1). A U-shaped limiting plate (7) is welded to the bottom of the bracket (5). A guide ring (8) is welded to the top and bottom of the U-shaped limiting plate (7). A spring (10) is welded to the inner wall of the top of the U-shaped limiting plate (7). A guide nozzle is provided at the bottom end of the intermittent mechanism. The intermittent mechanism includes a guide rod (3), a guide tube (11), a rotating shaft (12), a guide shaft (13), a ratchet (14), a guide plate (15), a guide shaft (16), a guide cylinder (17), a limiting post (18), a rotating plate (19), a pawl (20), a connecting shaft (21), and a torsion spring (22). The rotating shaft (12) is connected to the middle side of the fixed plate (1) via a bearing; The guide shaft (13) is located at the center of the inner wall of the mounting cylinder (2); The ratchet (14) is located on the end circumference of the guide shaft (13); The rotating plate (19) is rotatably connected to the circumference of the end of the guide shaft (13); The guide plate (15) is located at the end of the rotating shaft (12). One end of the guide plate (15) is provided with a guide protrusion. The bottom side of the fixed plate (1) is provided with a guide pipe (4), and one end of the guide pipe (4) is provided with a conveying hose (6). One end of the conveying hose (6) is connected to one side of the circumference of the conduit (11) by a thread.

2. The inorganic flame-retardant board according to claim 1, characterized in that, The fibers include the following parts by weight: 30-35 parts glass fiber, 20-25 parts wood fiber, and 15-25 parts seaweed fiber.

3. The inorganic flame-retardant board according to claim 1, characterized in that, The flame retardant comprises the following parts by weight: 8-12 parts magnesium oxide and 6-10 parts magnesium sulfate.

4. An inorganic flame-retardant board according to claim 1, characterized in that, The adhesive comprises 30-40 parts by weight of epoxy resin and 100-120 parts by weight of water.

5. An inorganic flame-retardant board according to claim 1, characterized in that, The limiting post (18) is located on one side of the rotating plate (19), and the guide protrusion is adapted to the limiting post (18); The connecting shaft (21) is located on one side of the top of the rotating plate (19); The pawl (20) is rotatably connected to the circumference of the connecting shaft (21), and the ratchet (14) is adapted to the pawl (20); The two ends of the torsion spring (22) are fixed to the end of the connecting shaft (21) and one side of the pawl (20), respectively; The guide tube (17) is welded to one side of the top of the rotating plate (19); The guide rod (3) is rotatably connected to one end of the guide cylinder (17); The guide shaft (16) is located at the bottom U end of the guide rod (3); The top end of the catheter (11) is rotatably connected to the circumference of the guide shaft (16), and the catheter (11) is slidably connected to the guide ring (8). The guide nozzle is connected to the bottom end of the catheter (11) by a thread.

6. An inorganic flame-retardant board according to claim 5, characterized in that, A fixing ring (9) is sleeved on the outer circumference of the middle section of the conduit (11), and a spring (10) is welded to the top outer wall of the fixing ring (9). The top outer wall of the spring (10) is welded to the top inner wall of the U-shaped limiting plate (7).

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