A powder coating spraying device and method for fireproof and corrosion-resistant steel structure

Abstract

The application discloses a kind of powder coating spraying device and method for fireproof corrosion-resistant steel structure, including translation mechanism, driving installation is lifted driving mechanism on translation mechanism, driving installation is supplied with powder mechanism and injection mechanism on lifting driving mechanism, and powder mechanism and injection mechanism are communicated by hose;One end of the distribution barrel is fixedly installed with the powder gun communicated with its inside, the other end of the distribution barrel is provided with the annular array of several horn-like interfaces, and the center between several horn-like interfaces of the distribution barrel is provided with conical groove;Injection mechanism includes installation cylinder, and the one end of installation cylinder is installed with the annular array of several glass powder hot melting components, and the center between several glass powder hot melting components of installation cylinder is fixedly installed with paint gun, and the application relates to spraying equipment technical field.The application solves the problem that steel structure is easily oxidized and corroded when exposed to natural environment.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, and in particular to a powder coating spraying device and method for fireproof and corrosion-resistant steel structures. Background Technology

[0002] In the construction and industrial sectors, steel structures are widely used due to their high strength, lightweight, and corrosion resistance. However, when exposed to the natural environment, steel structures are susceptible to oxidation and corrosion, leading to a decline in structural performance and potentially causing safety issues. To improve the service life and stability of steel structures, surface treatment and coating are necessary. Among these, fire-retardant and corrosion-resistant powder coatings are gaining increasing attention due to their excellent fire-resistant and corrosion-resistant properties, as well as their decorative effects.

[0003] As is well known, glass powder is a colorless and transparent granular substance that plays the following roles in coatings:

[0004] It increases the hardness and abrasion resistance of the coating. Due to its high hardness and high abrasion resistance, it can make the coating surface harder, more wear-resistant, and more corrosion-resistant; it also improves the gloss and transparency of the coating. Adding an appropriate amount of glass powder can make the coating surface smoother and more transparent, thereby improving the gloss and aesthetics of the coating; and it enhances the coating's resistance to ultraviolet rays. The alumina component in glass powder can absorb ultraviolet rays, thereby reducing the damage of ultraviolet rays to the coating and extending the service life of the coating.

[0005] Therefore, based on fire-retardant and corrosion-resistant powder coatings and glass powder, we propose a powder coating spraying device and method for fire-retardant and corrosion-resistant steel structures. Summary of the Invention

[0006] To address the problem of steel structures being susceptible to oxidation and corrosion when exposed to the natural environment, the present invention aims to provide a powder coating application device and method for fire-resistant and corrosion-resistant steel structures.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a powder coating spraying device for fireproof and corrosion-resistant steel structures, comprising a translation mechanism, a lifting drive mechanism driven on the translation mechanism, a powder supply mechanism and a spraying mechanism driven on the lifting drive mechanism, and the powder supply mechanism and the spraying mechanism being connected through several hoses;

[0008] The powder supply mechanism includes a distribution cylinder, one end of which is fixedly equipped with a powder spraying gun that communicates with its interior, and the other end of which is provided with a number of horn-shaped interfaces in a ring array. A conical groove is provided at the center of the distribution cylinder between the number of horn-shaped interfaces.

[0009] The spraying mechanism includes a mounting cylinder, one end of which is equipped with a plurality of glass powder hot-melting components arranged in a ring array, and a paint gun is fixedly mounted on the mounting cylinder at the center between the plurality of glass powder hot-melting components;

[0010] The glass powder hot-melt assembly includes a steel pipe with an electromagnetic coil surrounding its outer circumference. One end of the steel pipe is threaded with a powder spraying nozzle, and the other end of the steel pipe is threaded with an interface that connects to one end of a flexible hose.

[0011] Preferably, the translation mechanism includes a T-shaped guide rail, a movable platform is slidably connected to the outer wall of the T-shaped guide rail, a first hydraulic cylinder is fixedly connected to the top surface of the T-shaped guide rail, and the telescopic end of the first hydraulic cylinder is fixedly connected to the side of the movable platform for driving the movable platform to translate on the T-shaped guide rail.

[0012] Preferably, the lifting drive mechanism includes a second hydraulic cylinder fixedly mounted on the top surface of the movable platform. The top of the second hydraulic cylinder is a telescopic end, and a U-shaped bracket is fixedly connected to the top of the telescopic end.

[0013] Preferably, the dispensing cylinder is fixedly installed on the top of the U-shaped bracket, and the mounting cylinder is fixedly installed on the top of the U-shaped bracket.

[0014] Preferably, the larger opening end of the horn-shaped interface is connected to the dispensing cylinder, and the smaller opening end is connected to the flexible hose.

[0015] Preferably, two connecting rods are fixedly connected to both ends of the electromagnetic coil, and the two connecting rods are fixedly connected to the outer wall of the steel pipe.

[0016] Preferably, one end of the mounting cylinder is open, and a cap is fitted onto the outer wall of the opening; the other end of the mounting cylinder has a plurality of first through holes arranged in a ring, a second through hole is located at the center of the mounting cylinder between the plurality of first through holes, a plurality of third through holes are arranged in a ring, and a fourth through hole is located at the center of the cap between the plurality of third through holes; one end of the steel pipe is fixedly provided with a threaded opening, which is threadedly connected to the powder spray nozzle, the steel pipe is located inside the mounting cylinder, the threaded opening passes through the first through hole, and the steel pipe and the powder spray nozzle are respectively pressed against the inner and outer ends of the first through hole; the powder spray nozzle has a small powder spray hole communicating with the inside of the steel pipe; the end of the steel pipe away from the powder spray nozzle passes through the third through hole, and the interface is pressed against the outer wall of the cap; the outer wall of the spray gun near its nozzle end is fixedly connected to the inner wall of the second through hole, and the outer wall of the other end of the spray gun is fixedly connected to the inner wall of the fourth through hole; a bent pipe is connected to the outer end of the spray gun located outside the cap.

[0017] Preferably, a first fixing block is fixedly connected to the outer wall of the mounting cylinder, and a threaded hole is opened on the side wall of the first fixing block. A second fixing block is fixedly connected to the outer wall of the cover, and a through hole is opened on the side wall of the second fixing block. A bolt that is threaded to the threaded hole passes through the through hole, and the head of the bolt is pressed against the side wall of the second fixing block.

[0018] A powder coating application method for fire-resistant and corrosion-resistant steel structures includes the following steps:

[0019] Step 1: Connect the powder spray gun to the powder spray pump for supplying glass powder, and connect the paint spray gun to the paint spray pump.

[0020] Step 2: The powder spray gun sprays glass powder into the inside of the distribution cylinder. The glass powder enters several funnel-shaped interfaces with the airflow and then enters several steel pipes through several hoses.

[0021] Step 3: The electromagnetic coil is energized to electromagnetically heat the steel pipe. The high temperature generated inside the steel pipe melts the glass powder inside the steel pipe, and the molten glass powder is sprayed out from the powder spraying nozzle.

[0022] Step 5: Simultaneously, the paint pump delivers paint to the paint gun, which sprays the paint out in a mist. Several powder nozzles arranged in a ring array spray out molten glass powder in a mist, and the molten glass powder surrounds the sprayed paint in the center.

[0023] Step six: The lifting drive mechanism drives the powder supply mechanism and the spraying mechanism to move vertically, and the paint gun and several powder nozzles spray the steel structure product together.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0025] 1. This invention uses a combination of fire-retardant and corrosion-resistant powder coating and glass powder for spraying steel structures, which gives the steel structures good fire-retardant and corrosion-resistant properties, while also giving the steel structure surface good hardness and wear resistance.

[0026] 2. In this invention, molten glass powder is sprayed out in a mist form through several powder spraying nozzles arranged in a ring array. The molten glass powder surrounds the sprayed paint at the center, so that during the movement of the spraying mechanism, the mist-like paint first covers the steel structure product to form a base coat, then the molten glass powder covers the paint, and then the paint covers the molten glass powder again to form a top coat. The molten glass powder can cool and fuse with the base coat and top coat to solidify, which can greatly improve the role of glass powder in the coating.

[0027] 3. In this invention, the conical groove located inside the material distribution cylinder plays a role in guiding the airflow, reducing wind resistance, and allowing the powder to be evenly guided to several funnel-shaped interfaces.

[0028] 4. In this invention, an electromagnetic coil is energized to electromagnetically heat a steel pipe, and the high temperature generated inside the steel pipe melts the glass powder inside the steel pipe.

[0029] 5. In this invention, the glass powder hot-melt assembly, paint gun, and cap are installed in the mounting cylinder for easy installation and disassembly, facilitating later maintenance. Attached Figure Description

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the powder supply mechanism of the present invention;

[0033] Figure 3 This is a cross-sectional structural schematic diagram of the material distribution cylinder of the present invention;

[0034] Figure 4 This is a schematic diagram of the spray mechanism of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of the mounting cylinder and the cap in an explosion-proof configuration according to the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the mounting cylinder of the present invention;

[0037] Figure 7 This is a schematic diagram of the glass powder hot-melting assembly of the present invention;

[0038] Figure 8 For the present invention Figure 7 A schematic diagram of the structure of part A;

[0039] Figure 9 This is a schematic diagram of the powder spray nozzle structure of the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the paint spray gun of the present invention.

[0041] In the diagram: 1-Translation mechanism, 2-Lifting drive mechanism, 3-Powder supply mechanism, 4-Spraying mechanism, 5-Hose, 101-T-shaped guide rail, 102-Moving table, 103-First hydraulic cylinder, 201-Second hydraulic cylinder, 202-U-shaped bracket, 301-Distribution cylinder, 302-Powder spraying gun, 303-Flare-shaped interface, 304-Conical groove, 401-Mounting cylinder, 402-Glass powder hot-melt assembly, 403-Paint spraying gun, 404-Cap. 405-First through hole, 406-Second through hole, 407-Third through hole, 408-Fourth through hole, 409-Bend, 410-First fixing block, 411-Threaded hole, 412-Second fixing block, 413-Through hole, 414-Bolt, 40201-Steel pipe, 40202-Electromagnetic coil, 40203-Connecting rod, 40204-Powder spray nozzle, 40205-Interface, 40206-Threaded opening, 40207-Powder spray hole. Detailed Implementation

[0042] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0043] Please see Figures 1 to 10 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0044] This invention provides a technical solution: a powder coating spraying device for fireproof and corrosion-resistant steel structures, comprising a translation mechanism 1, a lifting drive mechanism 2 driven on the translation mechanism 1, the translation mechanism 1 enabling the lifting drive mechanism 2 to move in a horizontal straight direction, a powder supply mechanism 3 and a spraying mechanism 4 driven on the lifting drive mechanism 2, the lifting drive mechanism 2 being driven in a vertical direction, the powder supply mechanism 3 and the spraying mechanism 4 being connected through several hoses 5; the powder supply mechanism 3 supplies glass powder to the spraying mechanism 4 through the hoses 5.

[0045] The powder supply mechanism 3 includes a distribution cylinder 301. One end of the distribution cylinder 301 is fixedly installed with a powder spraying gun 302 that communicates with its interior. The powder spraying gun 302 is connected to a powder spraying pump for supplying glass powder. The other end of the distribution cylinder 301 is provided with a plurality of funnel-shaped interfaces 303 arranged in a ring. The funnel-shaped interfaces 303 communicate with the distribution cylinder 301 and the distribution cylinder 301 distributes powder to the funnel-shaped interfaces 303. A conical groove 304 is provided at the center of the distribution cylinder 301 between the funnel-shaped interfaces 303. The conical surface of the conical groove 304 inside the distribution cylinder 301 plays a role in guiding the airflow, reducing wind resistance, and making the powder flow evenly into the funnel-shaped interfaces 303.

[0046] The spraying mechanism 4 includes a mounting cylinder 401. A plurality of glass powder hot-melt components 402 arranged in a ring array are mounted on one end of the mounting cylinder 401. A paint spray gun 403 is fixedly mounted at the center of the mounting cylinder 401 between the plurality of glass powder hot-melt components 402. The mounting cylinder 401 is used to fix the glass powder hot-melt components 402 and the paint spray gun 403. The paint spray gun 403 sprays out atomized paint.

[0047] The glass powder hot-melt assembly 402 includes a steel pipe 40201, an electromagnetic coil 40202 surrounding the outer periphery of the steel pipe 40201, a powder spraying nozzle 40204 threaded onto one end of the steel pipe 40201, which is easy to install and disassemble; and an interface 40205 threaded onto the other end of the steel pipe 40201, which is connected to one end of the hose 5, and the interface 40205 is easy to install and disassemble.

[0048] The translation mechanism 1 includes a T-shaped guide rail 101, a movable platform 102 slidably passing through the outer wall of the T-shaped guide rail 101, and a first hydraulic cylinder 103 fixedly connected to the top surface of the T-shaped guide rail 101. The telescopic end of the first hydraulic cylinder 103 is fixedly connected to the side of the movable platform 102 and is used to drive the movable platform 102 to translate on the T-shaped guide rail 101. By driving its telescopic end, the first hydraulic cylinder 103 can move the movable platform 102 on the T-shaped guide rail 101 so that the spraying mechanism 4 can approach the sprayed steel structure product.

[0049] The lifting drive mechanism 2 includes a second hydraulic cylinder 201 fixedly installed on the top surface of the movable platform 102. The top of the second hydraulic cylinder 201 is a telescopic end, and a U-shaped bracket 202 is fixedly connected to the top of the telescopic end. The dispensing cylinder 301 is fixedly installed on the top of the U-shaped bracket 202, and the mounting cylinder 401 is fixedly installed on the top of the U-shaped bracket 202. The second hydraulic cylinder 201 drives its telescopic end to make the U-shaped bracket 202 rise or fall, so that the spraying mechanism 4 can move and spray in the vertical direction.

[0050] The larger opening end of the horn-shaped interface 303 is connected to the dispensing cylinder 301, and the smaller opening end is connected to the hose 5.

[0051] Two connecting rods 40203 are fixedly connected to both ends of the electromagnetic coil 40202. The two connecting rods 40203 are fixedly connected to the outer wall of the steel pipe 40201. The two ends of the electromagnetic coil 40202 are connected to a power source, which can control the electromagnetic coil 40202 to be energized and de-energized.

[0052] One end of the mounting cylinder 401 is open, and a cover 404 is fitted onto the outer wall of the opening; the other end of the mounting cylinder 401 has a plurality of first through holes 405 arranged in a ring, a second through hole 406 is provided at the center of the mounting cylinder 401 between the plurality of first through holes 405, a plurality of third through holes 407 are provided on the cover 404 arranged in a ring, and a fourth through hole 408 is provided at the center of the cover 404 between the plurality of third through holes 407; steel pipe 40 One end of the steel pipe 201 is fixedly provided with a threaded port 40206, which is threadedly connected to the powder spraying nozzle 40204. The steel pipe 40201 is located inside the mounting cylinder 401. The threaded port 40206 passes through the first through hole 405. The steel pipe 40201 and the powder spraying nozzle 40204 are respectively pressed against the inner and outer ends of the first through hole 405. The powder spraying nozzle 40204 has a small powder spraying hole 40207 that communicates with the inside of the steel pipe 40201. The steel pipe 40201 is away from... One end of the powder nozzle 40204 passes through the third through hole 407, and the interface 40205 is pressed against the outer wall of the cover 404; the outer wall of the paint gun 403 near its nozzle end is fixedly connected to the inner wall of the second through hole 406, and the outer wall of the other end of the paint gun 403 is fixedly connected to the inner wall of the fourth through hole 408; a bent tube 409 is connected to one end of the paint gun 403 located outside the cover 404, and a first fixing block 410 is fixedly connected to the outer wall of the mounting cylinder 401. The side wall of the fixed block 410 is provided with a threaded hole 411. The outer wall of the cover 404 is fixedly connected to a second fixed block 412. The side wall of the second fixed block 412 is provided with a through hole 413. A bolt 414 threadedly connected to the threaded hole 411 is passed through the through hole 413. The head of the bolt 414 is pressed against the side wall of the second fixed block 412, so that the glass powder hot melt assembly 402, the paint gun 403, and the cover 404 can be easily installed and disassembled in the mounting cylinder 401 for later maintenance.

[0053] A powder coating application method for fire-resistant and corrosion-resistant steel structures includes the following steps:

[0054] Step 1: The powder spray gun 302 is connected to the powder spray pump for supplying glass powder, and the paint spray gun 403 is connected to the paint spray pump, which supplies fire-retardant and corrosion-resistant paint.

[0055] Step 2: The powder spraying gun 302 sprays glass powder into the inside of the dispensing cylinder 301. The glass powder enters several funnel-shaped interfaces 303 with the airflow and enters several steel pipes 40201 through several hoses 5.

[0056] Step 3: The electromagnetic coil 40202 is energized to electromagnetically heat the steel pipe 40201. The high temperature generated inside the steel pipe 40201 melts the glass powder inside the steel pipe 40201, and the molten glass powder is sprayed out from the powder spraying nozzle 40204.

[0057] Step 5: Simultaneously, the paint pump delivers paint to the paint gun 403, which sprays the paint in a mist. Several powder nozzles 40204 arranged in a ring array spray molten glass powder in a mist, and the molten glass powder surrounds the sprayed paint in the center.

[0058] Step six: The lifting drive mechanism 2 drives the powder supply mechanism 3 and the spraying mechanism 4 to move vertically. The paint gun 403 and several powder nozzles 40204 spray the paint towards the steel structure product. During the movement of the spraying mechanism 4, the mist-like paint first covers the steel structure product to form the base coat. Then, the molten glass powder covers the paint, and then the paint covers the molten glass powder again to form the top coat. The molten glass powder can cool and fuse with the base coat and the top coat, which can greatly improve the role of the glass powder in the coating.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A powder coating spraying method for fireproof and corrosion-resistant steel structures, the spraying device comprising a translation mechanism (1), a lifting drive mechanism (2) being driven on the translation mechanism (1), a powder supply mechanism (3) and a spraying mechanism (4) being driven on the lifting drive mechanism (2), the powder supply mechanism (3) and the spraying mechanism (4) being connected by a plurality of hoses (5); the powder supply mechanism (3) comprising a dispensing cylinder (301), one end of the dispensing cylinder (301) being fixedly mounted with a powder spraying gun (302) communicating with its interior, the other end of the dispensing cylinder (301) being provided with a plurality of horn-shaped interfaces (303) arranged in a ring array, the dispensing cylinder (301) being located at the center between the plurality of horn-shaped interfaces (303) The spraying mechanism (4) includes a conical groove (304); the spraying mechanism (4) includes a mounting cylinder (401), one end of which is equipped with a plurality of glass powder hot-melt components (402) arranged in a ring array, and a paint gun (403) is fixedly installed at the center between the plurality of glass powder hot-melt components (402); the glass powder hot-melt component (402) includes a steel pipe (40201), an electromagnetic coil (40202) is surrounded around the outer periphery of the steel pipe (40201), one end of the steel pipe (40201) is threaded with a powder spraying nozzle (40204), and the other end of the steel pipe (40201) is threaded with an interface (40205) connected to one end of a hose (5); characterized in that, It includes the following steps: Step 1: The powder spray gun (302) is connected to the powder spray pump for supplying glass powder, and the paint spray gun (403) is connected to the paint spray pump. Step 2: The powder spray gun (302) sprays glass powder into the inside of the distribution cylinder (301). The glass powder enters several funnel-shaped interfaces (303) with the airflow and enters several steel pipes (40201) through several hoses (5). Step 3: The electromagnetic coil (40202) is energized to electromagnetically heat the steel pipe (40201). The high temperature generated inside the steel pipe (40201) melts the glass powder in the steel pipe (40201), and the molten glass powder is sprayed out from the powder spraying nozzle (40204). Step 5: Simultaneously, the paint pump delivers paint to the paint gun (403), the paint gun (403) sprays the paint in a mist, and several powder nozzles (40204) arranged in a ring array spray molten glass powder in a mist, and the molten glass powder surrounds the sprayed paint in the center. Step six, the lifting drive mechanism (2) drives the powder supply mechanism (3) and the spraying mechanism (4) to move in the vertical direction, and the paint gun (403) and several powder nozzles (40204) spray the steel structure product together.

2. The powder coating spraying method for fireproof and corrosion-resistant steel structures according to claim 1, characterized in that: The translation mechanism (1) includes a T-shaped guide rail (101), and a movable platform (102) is slidably connected to the outer wall of the T-shaped guide rail (101). A first hydraulic cylinder (103) is fixedly connected to the top surface of the T-shaped guide rail (101). The telescopic end of the first hydraulic cylinder (103) is fixedly connected to the side of the movable platform (102) and is used to drive the movable platform (102) to translate on the T-shaped guide rail (101).

3. The powder coating spraying method for fireproof and corrosion-resistant steel structures according to claim 2, characterized in that: The lifting drive mechanism (2) includes a second hydraulic cylinder (201) fixedly installed on the top surface of the movable platform (102). The top of the second hydraulic cylinder (201) is a telescopic end, and a U-shaped bracket (202) is fixedly connected to the top of the telescopic end.

4. The powder coating spraying method for fireproof and corrosion-resistant steel structures according to claim 3, characterized in that: The dispensing cylinder (301) is fixedly installed on the top of the U-shaped bracket (202), and the mounting cylinder (401) is fixedly installed on the top of the U-shaped bracket (202).

5. A powder coating spraying method for fire-resistant and corrosion-resistant steel structures according to claim 1, characterized in that: The larger opening end of the horn-shaped interface (303) is connected to the dispensing cylinder (301), and the smaller opening end is connected to the hose (5).

6. The powder coating spraying method for fireproof and corrosion-resistant steel structures according to claim 1, characterized in that: The electromagnetic coil (40202) has two connecting rods (40203) fixedly connected to its two ends, and the two connecting rods (40203) are fixedly connected to the outer wall of the steel pipe (40201).

7. A powder coating spraying method for fire-resistant and corrosion-resistant steel structures according to claim 1, characterized in that: One end of the mounting cylinder (401) is open, and a cap (404) is fitted onto the outer wall of the opening; the other end of the mounting cylinder (401) has a plurality of first through holes (405) arranged in a ring, and a second through hole (406) is provided at the center of the mounting cylinder (401) between the plurality of first through holes (405); the cap (404) has a plurality of third through holes (407) arranged in a ring, and a fourth through hole (408) is provided at the center of the cap (404) between the plurality of third through holes (407); one end of the steel pipe (40201) is fixedly provided with a threaded port (40206), and the threaded port (40206) is threadedly connected to the powder spraying port (40204); the steel pipe (40201) is located inside the mounting cylinder (401), and the threaded port... (40206) Passing through the first through hole (405), the steel pipe (40201) and the powder spray nozzle (40204) are respectively pressed against the inner and outer ports of the first through hole (405); the powder spray nozzle (40204) is provided with a small powder spray hole (40207) communicating with the inside of the steel pipe (40201); the end of the steel pipe (40201) away from the powder spray nozzle (40204) passes through the third through hole (407), and the interface (40205) is pressed against the outer wall of the cover (404); the outer wall of the paint gun (403) near its nozzle end is fixedly connected to the inner wall of the second through hole (406), and the outer wall of the other end of the paint gun (403) is fixedly connected to the inner wall of the fourth through hole (408); the end of the paint gun (403) located outside the cover (404) is connected to a bent pipe (409).

8. A powder coating spraying method for fire-resistant and corrosion-resistant steel structures according to claim 7, characterized in that: The outer wall of the mounting cylinder (401) is fixedly connected to a first fixing block (410), and the side wall of the first fixing block (410) is provided with a threaded hole (411). The outer wall of the cover (404) is fixedly connected to a second fixing block (412), and the side wall of the second fixing block (412) is provided with a through hole (413). A bolt (414) that is threadedly connected to the threaded hole (411) is passed through the through hole (413), and the head of the bolt (414) is pressed against the side wall of the second fixing block (412).

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