Steel structure fireproof coating spraying device and method for unconventional positions

Abstract

The invention discloses a steel structure fireproof coating spraying device and method for unconventional positions, and belongs to the technical field of fireproof coating spraying, the device comprises an electric trolley, a lifting device, a coating box, a longitudinal driving device and an arc-shaped spraying device, an arc-shaped support mounting frame is mounted on the longitudinal driving device, and a through groove is formed in the arc-shaped support mounting frame; the first gear is rotationally installed in the through groove, the first motor is installed at the top end of the arc-shaped support installation frame and connected with a rotating shaft of the first gear, the inner side wall of the arc-shaped rack support is slidably connected with the through groove, the arc-shaped rack support is meshed with the first gear, and the spraying heads are installed at the two ends of the arc-shaped rack support. And the nozzle is communicated with the spraying device through a spraying pipe. According to the spraying device, the arc-shaped rack support is driven to rotate on the arc-shaped support mounting frame, the sprayers at the two ends can be driven to spray unconventional positions such as free faces of corner columns and side columns of a steel structure, operation is easy, and the spraying efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of fire retardant coating spraying, and in particular relates to a device and method for spraying fire retardant coating on steel structures at unconventional positions. Background Art

[0002] Steel structures are widely used in the construction of high-rise buildings and factories, and are mainly composed of crossbeams, longitudinal beams and some reinforcing beams. Steel structures deform in high temperature environments, resulting in a reduction in the bearing capacity of steel structures. Therefore, during the construction of steel structures, fire retardant coatings must be sprayed on the surface of the steel structures to improve the fire resistance of the steel structures. At present, most steel structure construction is done by manual spraying. The thickness of the fire retardant coating is uneven during manual spraying. The spraying quality is poor for the free surfaces of corner columns and side columns, higher positions, and unconventional positions where crossbeams and longitudinal beams intersect. At the same time, the spraying efficiency for these unconventional positions is low, and the safety of the spraying operation is poor. It is urgent for technical personnel in this field to propose a steel structure fire retardant coating spraying device for unconventional positions, which can improve the spraying quality and efficiency of fire retardant coatings at unconventional positions of steel structures. Summary of the invention

[0003] In view of this, the present invention provides a fire retardant coating spraying device and method for steel structures in unconventional positions, which are used to solve the above-mentioned problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A fire retardant coating spraying device for steel structures in unconventional positions, comprising: an electric trolley, a lifting device, a coating box, a longitudinal driving device and an arc-shaped spraying device, wherein the arc-shaped spraying device comprises an arc-shaped rack bracket, a spray head, a spray pipe, a spraying device, an arc-shaped bracket mounting frame, a first gear and a first motor, wherein the lifting device is mounted on the electric trolley, a coating box placement box is arranged at the top of the lifting device, the coating box is mounted in the coating box placement box, the longitudinal driving device is mounted on the side wall of the coating box placement box, and the arc-shaped bracket mounting frame is mounted on the longitudinal driving device. On the device, a through groove is provided on the arc-shaped bracket mounting frame, the rotating shaft of the first gear is rotatably mounted in the through groove, the first motor is mounted on the top of the arc-shaped bracket mounting frame, the output end of the first motor is fixedly connected to one end of the rotating shaft of the first gear, the inner side wall of the arc-shaped rack bracket is slidably connected to the through groove, the arc-shaped rack bracket is meshed with the first gear, the two nozzles are mounted at both ends of the arc-shaped rack bracket, the spray device is mounted on the paint box and connected to the paint box, and the nozzle is connected to the spray device through the spray pipe.

[0006] Furthermore, the longitudinal drive device includes a lead screw, a sliding rod, a block, a second motor and a longitudinal bracket, the longitudinal bracket is installed on the side wall of the paint box placement box, the lead screw and the sliding rod are vertically installed side by side in the longitudinal bracket, both ends of the lead screw are rotatably connected to the longitudinal bracket, the sliding rod is fixedly connected to the longitudinal bracket, the second motor is installed at the top of the longitudinal bracket, the output end of the second motor is fixedly connected to the top of the lead screw, the block is sleeved on the lead screw and the sliding rod, the lead screw is threadedly connected to the slider, the sliding rod is slidably connected to the slider, and the arc bracket mounting frame is installed on the slider.

[0007] Furthermore, a telescopic rod is provided on the side wall of the sliding block, and the arc-shaped bracket mounting frame is installed on the output end of the telescopic rod.

[0008] Furthermore, it also includes a horizontal rotation device, which includes a third motor and a second gear. The telescopic rod is rotatably connected to the slider, and a toothed portion is provided on the side wall of the telescopic rod. The third motor is installed on the side wall of the slider and is located directly below the telescopic rod. The second gear is installed at the output end of the third motor, and the second gear is meshed with the toothed portion.

[0009] Furthermore, the lifting device is a scissors-type lifting platform.

[0010] Furthermore, the spray tube is a PU spring tube.

[0011] A method for spraying fire retardant coating on steel structures at unconventional locations comprises the following steps:

[0012] S1. Move the electric trolley to the corner column or side column of the steel structure;

[0013] S2. Extend the telescopic rod to move the arc-shaped rack bracket forward so that the corner column or side column is located at the center of the arc-shaped rack bracket;

[0014] S3. Turn on the second motor, so that the second motor drives the lead screw to rotate in the longitudinal bracket, driving the slider to move upward from the bottom end of the longitudinal bracket. When the slider moves to the top end of the longitudinal bracket, the second motor stops rotating, and the scissor-type lifting platform drives the longitudinal bracket to move upward for spraying; during the process, the spraying device is turned on, and the fire retardant paint is sprayed from the paint box to the surface of the steel structure through the PU spring tube and the nozzle; at the same time, the first motor is turned on, and the first motor drives the first gear to rotate, driving the arc-shaped rack bracket to rotate around the center of the arc-shaped rack bracket in the arc-shaped bracket mounting frame, and the two nozzles spray the fire retardant paint 360 degrees around the central diagonal column or side column of the arc-shaped rack bracket;

[0015] S4. When the arc-shaped rack bracket moves to the intersection of the steel structure cross beam and the longitudinal beam, the telescopic rod shrinks, the arc-shaped rack bracket leaves the steel structure, the third motor is turned on, the third motor drives the second gear to rotate, so that the telescopic rod drives the arc-shaped rack bracket to rotate 45 degrees around the center of the telescopic rod, the telescopic rod is extended, and the arc-shaped rack bracket enters the intersection of the cross beam and the longitudinal beam, the first motor is turned on, and the two nozzles spray the fire retardant coating 360 degrees on the intersection of the cross beam and the longitudinal beam;

[0016] S5. The telescopic rod is retracted, the arc-shaped rack bracket leaves the steel structure, the third motor is turned on, the third motor drives the second gear to rotate, so that the telescopic rod drives the arc-shaped rack bracket to rotate 90 degrees around the center of the telescopic rod, the telescopic rod is extended, and the arc-shaped rack bracket enters the intersection of the crossbeam and the longitudinal beam, the first motor is turned on, and the two nozzles spray the fire retardant coating 360 degrees on the other two quadrants of the intersection of the crossbeam and the longitudinal beam;

[0017] S6. The telescopic rod is retracted, the arc-shaped rack bracket leaves the steel structure, the third motor is turned on, and the third motor drives the second gear to rotate, so that the telescopic rod drives the arc-shaped rack bracket to rotate 45 degrees around the center of the telescopic rod, and the arc-shaped rack bracket becomes vertical. The telescopic rod is extended so that the beam is located at the center of the arc-shaped rack bracket, and the first motor is turned on to make the two nozzles spray the fire retardant coating on the beam at 360 degrees; at the same time, the electric trolley moves to spray the fire retardant coating on the beam;

[0018] S7. Repeat S1 to S6 to spray the fire retardant coating on the entire steel structure.

[0019] The beneficial effects of the present invention are:

[0020] The first motor of the present invention drives the first gear to rotate on the arc-shaped bracket mounting frame, and the first gear drives the arc-shaped rack bracket to rotate, driving the nozzles at both ends to rotate around the axis of the arc-shaped rack bracket, thereby realizing the spraying of fire-retardant coating on the free surfaces of the corner columns and side columns of the steel structure by the nozzles; the second motor drives the lead screw to rotate, thereby realizing the vertical movement of the slider on the lead screw and the slider, so that the arc-shaped rack bracket moves downward with the two nozzles to the lower part of the steel structure corresponding to the lifting device and the electric trolley; the third motor drives the telescopic rod to rotate horizontally, thereby realizing the rotation of the arc-shaped rack bracket with the two nozzles around the axis of the telescopic rod, thereby spraying the fire-retardant coating in unconventional positions such as the cross-intersection of the crossbeam and the longitudinal beam, and the spraying is uniform and the spraying quality is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 The figure is a schematic diagram of the structure of a fire retardant coating spraying device for steel structures in unconventional locations.

[0023] Figure 2 The figure is a front view of a steel structure fire retardant coating spraying device for non-conventional locations.

[0024] Figure 3 This is a left view of a steel structure fire retardant coating spraying device for unconventional locations.

[0025] Figure 4 A top view of a fire retardant coating spraying device for steel structures in unconventional locations.

[0026] Figure 5 It is a schematic diagram of the structure of the arc-shaped rack bracket and the arc-shaped bracket mounting frame.

[0027] Among them, in the figure:

[0028] 10-electric trolley, 20-scissor lift platform, 21-paint box placement box, 30-paint box, 40-longitudinal drive device, 41-screw, 42-slide rod, 43-slider, 44-second motor, 45-longitudinal bracket, 46-telescopic rod, 461-tooth portion, 51-arc rack bracket, 52-spray head, 53-PU spring tube, 54-spraying device, 55-arc bracket mounting frame, 551-through slot, 56-first gear, 57-first motor, 60-horizontal rotation device, 61-third motor, 62-second gear. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] Refer to the attached Figure 1-5As shown, the present invention provides a fire retardant coating spraying device for steel structures in unconventional positions, comprising: an electric trolley 10, a lifting device, a coating box 30, a longitudinal driving device 40 and an arc spraying device, the arc spraying device comprising an arc rack bracket 51, a spray head 52, a spray pipe, a spraying device 54, an arc bracket mounting frame 55, a first gear 56 and a first motor 57, the lifting device is mounted on the electric trolley 10, a coating box placing box 21 is arranged at the top of the lifting device, the coating box 30 is installed in the coating box placing box 21, the longitudinal driving device 40 is installed on the side wall of the coating box placing box 21, and the arc bracket mounting frame 55 is installed on the side wall of the coating box placing box 21. Installed on the longitudinal driving device 40, a through groove 551 is provided on the arc-shaped bracket mounting frame 55, the rotating shaft of the first gear 56 is rotatably installed in the through groove 551, the first motor 57 is installed at the top of the arc-shaped bracket mounting frame 55, the output end of the first motor 57 is fixedly connected to one end of the rotating shaft of the first gear 56, the inner side wall of the arc-shaped rack bracket 51 is slidably connected to the through groove 551, the arc-shaped rack bracket 51 is meshed with the first gear 56, two nozzles 52 are installed at both ends of the arc-shaped rack bracket 51, the spraying device 54 is installed on the paint box 30 and is connected to the paint box 30, and the nozzle 52 is connected to the spraying device 54 through a spraying pipe. The first motor 57 drives the first gear 56 to rotate, and through the meshing transmission with the arc-shaped rack bracket 51, the arc-shaped rack bracket 51 is rotated on the arc-shaped bracket mounting bracket 55, so that the two nozzles 52 rotate around the center line of the arc-shaped rack bracket 51, thereby realizing the spraying of fire retardant coating on the free surfaces such as corner columns or side columns of the steel structure.

[0032] In a preferred embodiment, the longitudinal drive device 40 includes a lead screw 41, a sliding rod 42, a slider 43, a second motor 44 and a longitudinal bracket 45. The longitudinal bracket 45 is installed on the side wall of the paint box placement box 21, the lead screw 41 and the sliding rod 42 are vertically installed side by side in the longitudinal bracket 45, both ends of the lead screw 41 are rotatably connected to the longitudinal bracket 45, the sliding rod 42 is fixedly connected to the longitudinal bracket 45, the second motor 44 is installed at the top of the longitudinal bracket 45, the output end of the second motor 44 is fixedly connected to the top of the lead screw 41, the slider 43 is sleeved on the lead screw 41 and the sliding rod 42, the lead screw 41 is threadedly connected to the slider 43, the sliding rod 42 is slidably connected to the slider 43, and the arc bracket mounting frame 55 is installed on the slider 43. The spray head 52 is located on the electric trolley 10 and the lifting device at a relatively high position. In order to realize the spraying of the lower position of the steel structure corresponding to the electric trolley 10 and the lifting device, the second motor 44 drives the lead screw 41 to rotate, so that the slider 43 rotates on the lead screw 41 and the slide rod 42, and the spray head 52 can be used to spray the fire retardant paint on the lower lower position of the steel structure corresponding to the lifting device and the electric trolley 10.

[0033] In a preferred embodiment, a telescopic rod 46 is provided on the side wall of the slider 43, and an arc-shaped bracket mounting frame 55 is installed at the output end of the telescopic rod 46. The telescopic rod 46 drives the arc-shaped bracket mounting frame 55, the arc-shaped rack bracket 51 and the nozzle 52 to approach or move away from the steel structure.

[0034] In a preferred embodiment, a fire retardant coating spraying device for steel structures at unconventional positions further includes a horizontal rotation device 60, which includes a third motor 61 and a second gear 62. The telescopic rod 46 is rotatably connected to the slider 43. A toothed portion 461 is provided on the side wall of the telescopic rod 46. The third motor 61 is mounted on the side wall of the slider 43, directly below the telescopic rod 46. The second gear 62 is mounted on the output end of the third motor 61, and the second gear 62 is meshed with the toothed portion 461. The third motor 61 is meshed with the toothed portion 461 on the telescopic rod 46 through the meshing transmission of the second gear 62 and the toothed portion 461 on the telescopic rod 46, so as to realize the rotation of the arc-shaped rack bracket 51 with the two nozzles 52 around the axis of the telescopic rod 46, thereby increasing the degree of freedom of spraying the fire retardant coating and adapting to the spraying at unconventional positions on the steel structure.

[0035] In a preferred embodiment, the lifting device is a scissor-type lifting platform 20, which is a conventional technical means and will not be described in detail here.

[0036] In a preferred embodiment, the spray tube is a PU spring tube 53 , which can increase the length of the spray tube to adapt to the movement of the nozzle 52 .

[0037] Example 2

[0038] A method for spraying fire retardant coating on steel structures at unconventional locations comprises the following steps:

[0039] S1. Move the electric trolley 10 to the corner column or side column of the steel structure;

[0040] S2. The telescopic rod 46 is extended to move the arc-shaped rack bracket 51 forward so that the corner column or the side column is located at the center of the arc-shaped rack bracket 51;

[0041] S3. Turn on the second motor 44, so that the second motor 44 drives the lead screw 41 to rotate in the longitudinal bracket 45, and drives the slider 43 to move upward from the bottom end of the longitudinal bracket 45. When the slider 43 moves to the top end of the longitudinal bracket 45, the second motor 44 stops rotating, and the scissor-type lifting platform 20 drives the longitudinal bracket 45 to move upward for spraying; during the process, the spraying device 54 is turned on, and the fire retardant paint is sprayed from the paint box 30 to the surface of the steel structure through the PU spring tube 53 and the nozzle 52; at the same time, the first motor 57 is turned on, and the first motor 57 drives the first gear 56 to rotate, driving the arc rack bracket 51 to rotate around the center of the arc rack bracket 51 in the arc bracket mounting frame 55, and the two nozzles 52 spray the fire retardant paint 360 degrees around the central diagonal column or side column of the arc rack bracket 51;

[0042] S4. When the arc-shaped rack bracket 51 moves to the intersection of the steel structure cross beam and the longitudinal beam, the telescopic rod 46 contracts, the arc-shaped rack bracket 51 leaves the steel structure, and the third motor 61 is turned on. The third motor 61 drives the second gear 62 to rotate, so that the telescopic rod 46 drives the arc-shaped rack bracket 51 to rotate 45 degrees around the center of the telescopic rod 46, and the telescopic rod 46 is extended, so that the arc-shaped rack bracket 51 enters the intersection of the cross beam and the longitudinal beam, and the first motor 57 is turned on, so that the two nozzles 52 spray the fire retardant coating on the intersection of the cross beam and the longitudinal beam at 360 degrees;

[0043] S5. The telescopic rod 46 is retracted, the arc-shaped rack bracket 51 leaves the steel structure, and the third motor 61 is turned on. The third motor 61 drives the second gear 62 to rotate, so that the telescopic rod 46 drives the arc-shaped rack bracket 51 to rotate 90 degrees around the center of the telescopic rod 46, and the telescopic rod 46 is extended, so that the arc-shaped rack bracket 51 enters the intersection of the crossbeam and the longitudinal beam, and the first motor 57 is turned on, so that the two nozzles 52 spray the fire retardant coating on the other two quadrants of the intersection of the crossbeam and the longitudinal beam at 360 degrees;

[0044] S6. The telescopic rod 46 is retracted, the arc-shaped rack bracket 51 leaves the steel structure, and the third motor 61 is turned on. The third motor 61 drives the second gear 62 to rotate, so that the telescopic rod 46 drives the arc-shaped rack bracket 51 to rotate 45 degrees around the center of the telescopic rod 46, and the arc-shaped rack bracket 51 becomes vertical. The telescopic rod 46 is extended, so that the beam is located at the center of the arc-shaped rack bracket 51, and the first motor 57 is turned on, so that the two nozzles 52 spray the fire retardant coating on the beam 360 degrees; at the same time, the electric trolley 10 moves to spray the fire retardant coating on the beam;

[0045] S7. Repeat S1 to S6 to spray the fire retardant coating on the entire steel structure. It should be noted that in S4 to S5, the rotation of the telescopic rod 46 around its axis is not limited to 45 degrees and 90 degrees. During the specific spraying, the telescopic rod 46 can be rotated around its axis at an appropriate angle to adapt to the spraying of fire retardant coating at unconventional positions of the steel structure.

[0046] The above is only a specific embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fire retardant coating spraying device for steel structures in unconventional locations, characterized in that: include: An electric trolley (10), a lifting device, a paint box (30), a longitudinal drive device (40) and an arc spraying device, wherein the arc spraying device comprises an arc rack support (51), a spray head (52), a spray pipe, a spraying device (54), an arc support mounting frame (55), a first gear (56) and a first motor (57), the lifting device is mounted on the electric trolley (10), a paint box placement box (21) is arranged at the top of the lifting device, the paint box (30) is mounted in the paint box placement box (21), the longitudinal drive device (40) is mounted on the side wall of the paint box placement box (21), the arc support mounting frame (55) is mounted on the longitudinal drive device (40), and the arc support mounting frame (55) is mounted on the longitudinal drive device (40). A through groove (551) is provided, the rotating shaft of the first gear (56) is rotatably installed in the through groove (551), the first motor (57) is installed at the top end of the arc-shaped bracket mounting frame (55), the output end of the first motor (57) is fixedly connected to one end of the rotating shaft of the first gear (56), the inner side wall of the arc-shaped rack bracket (51) is slidably connected to the through groove (551), the arc-shaped rack bracket (51) is meshed with the first gear (56), the two spray heads (52) are installed at both ends of the arc-shaped rack bracket (51), the spray device (54) is installed on the paint box (30) and is connected to the paint box (30), and the spray head (52) is connected to the spray device (54) through the spray pipe.

2. The fire retardant coating spraying device for steel structures at unconventional locations according to claim 1 is characterized in that: The longitudinal drive device (40) comprises a lead screw (41), a sliding rod (42), a slider (43), a second motor (44) and a longitudinal bracket (45). The longitudinal bracket (45) is installed on the side wall of the paint box placement box (21). The lead screw (41) and the sliding rod (42) are vertically installed side by side in the longitudinal bracket (45). Both ends of the lead screw (41) are rotatably connected to the longitudinal bracket (45). The sliding rod (42) is fixedly connected to the longitudinal bracket (45). The second motor (44) is installed at the top end of the longitudinal bracket (45). The output end of the second motor (44) is fixedly connected to the top end of the lead screw (41). The slider (43) is sleeved on the lead screw (41) and the sliding rod (42). The lead screw (41) is threadedly connected to the slider (43). The sliding rod (42) is slidably connected to the slider (43). The arc bracket mounting frame (55) is installed on the slider (43).

3. The fire retardant coating spraying device for steel structures at unconventional locations according to claim 2 is characterized in that: A telescopic rod (46) is provided on the side wall of the sliding block (43), and the arc-shaped bracket mounting frame (55) is mounted on the output end of the telescopic rod (46).

4. The fire retardant coating spraying device for steel structures at unconventional locations according to claim 3 is characterized in that: The invention also comprises a horizontal rotation device (60), wherein the horizontal rotation device (60) comprises a third motor (61) and a second gear (62); the telescopic rod (46) is rotatably connected to the slider (43); a toothed portion (461) is provided on the side wall of the telescopic rod (46); the third motor (61) is mounted on the side wall of the slider (43) and is located directly below the telescopic rod (46); the second gear (62) is mounted on the output end of the third motor (61); and the second gear (62) is meshed with the toothed portion (461).

5. The fire retardant coating spraying device for steel structures at unconventional locations according to claim 1 is characterized in that: The lifting device is a scissor-type lifting platform (20).

6. The fire retardant coating spraying device for steel structures at unconventional locations according to claim 1 is characterized in that: The spraying tube is a PU spring tube (53).

7. A method for spraying fire retardant coating on steel structures at unconventional locations, characterized in that: The steps include: S1. Move the electric trolley (10) to the corner column or side column of the steel structure; S2. The telescopic rod (46) is extended to move the arc-shaped rack bracket (51) forward so that the corner column or the side column is located at the center of the arc-shaped rack bracket (51); S3. Turn on the second motor (44), so that the second motor (44) drives the lead screw (41) to rotate in the longitudinal bracket (45), driving the slider (43) to move upward from the bottom end of the longitudinal bracket (45), and when the slider (43) moves to the top end of the longitudinal bracket (45), the second motor (44) stops rotating, and the scissor-type lifting platform (20) drives the longitudinal bracket (45) to move upward for spraying; during the process, the spraying device (54) is turned on, and the fire retardant coating is sprayed from the coating box (30) through the PU spring tube (53) and the nozzle (52) onto the surface of the steel structure; at the same time, turn on the first motor (57), and the first motor (57) drives the first gear (56) to rotate, driving the arc-shaped rack bracket (51) to rotate around the center of the arc-shaped rack bracket (51) in the arc-shaped bracket mounting frame (55), and the two nozzles (52) spray the fire retardant coating 360 degrees around the central diagonal column or side column of the arc-shaped rack bracket (51); S4. When the arc-shaped rack bracket (51) moves to the intersection of the steel structure cross beam and the longitudinal beam, the telescopic rod (46) contracts, the arc-shaped rack bracket (51) leaves the steel structure, and the third motor (61) is turned on. The third motor (61) drives the second gear (62) to rotate, so that the telescopic rod (46) drives the arc-shaped rack bracket (51) to rotate 45 degrees around the center of the telescopic rod (46). The telescopic rod (46) is extended, so that the arc-shaped rack bracket (51) enters the intersection of the cross beam and the longitudinal beam, and the first motor (57) is turned on, so that the two nozzles (52) spray the fire retardant coating 360 degrees on the intersection of the cross beam and the longitudinal beam; S5. The telescopic rod (46) is retracted, the arc-shaped rack bracket (51) leaves the steel structure, the third motor (61) is turned on, and the third motor (61) drives the second gear (62) to rotate, so that the telescopic rod (46) drives the arc-shaped rack bracket (51) to rotate 90 degrees around the center of the telescopic rod (46), and the telescopic rod (46) is extended, so that the arc-shaped rack bracket (51) enters the intersection of the crossbeam and the longitudinal beam, and the first motor (57) is turned on, so that the two nozzles (52) spray the fire retardant coating on the other two quadrants of the intersection of the crossbeam and the longitudinal beam at 360 degrees; S6. The telescopic rod (46) is retracted, the arc-shaped rack bracket (51) leaves the steel structure, and the third motor (61) is turned on. The third motor (61) drives the second gear (62) to rotate, so that the telescopic rod (46) drives the arc-shaped rack bracket (51) to rotate 45 degrees around the center of the telescopic rod (46), and the arc-shaped rack bracket (51) becomes vertical. The telescopic rod (46) is extended, so that the beam is located at the center of the arc-shaped rack bracket (51), and the first motor (57) is turned on, so that the two nozzles (52) spray the fire retardant coating on the beam at 360 degrees; at the same time, the electric trolley (10) moves to spray the fire retardant coating on the beam; S7. Repeat S1 to S6 to spray the fire retardant coating on the entire steel structure.

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