An adjustable steel structure spraying device

Abstract

This application relates to the field of steel structure surface treatment technology, specifically disclosing an adjustable steel structure spraying device, including a frame and a shell. The shell is located at the upper end of the frame, and a primer tank is located on one side of the frame. A primer hose is connected to the primer tank, and the end of the primer hose away from the primer tank is located inside the shell. A spraying pump is installed on the primer hose, with the inlet end connected to the primer tank and the outlet end connected to the primer hose. A conveying assembly is installed on the frame, and a spraying mechanism is installed inside the shell. A cylindrical steel material is placed on the frame, and the conveying assembly in this application can convey the steel material. When the steel material is conveyed into the shell, the spraying pump is activated, and the primer in the primer tank is conveyed to the primer hose. At this time, the spraying mechanism can evenly spray the primer onto the inner and outer peripheral walls of the cylindrical steel material. Compared with the handheld spray gun spraying in the prior art, this improves the spraying effect and coverage uniformity of the primer, and enhances the adhesion and corrosion resistance of the primer.

Description

Technical Field

[0001] This application relates to the field of steel structure surface treatment technology, and in particular to an adjustable steel structure spraying device. Background Technology

[0002] Steel structures are building structural systems with steel as the core load-bearing component. They are widely used in large industrial plants, bridges, super high-rise buildings, and energy facilities. During processing, after cutting and welding, the surface of the steel is exposed to the air and is susceptible to corrosion from moisture, chloride ions, and other corrosive media, leading to rust or even structural failure. To ensure its long-term service safety, anti-corrosion primer must be sprayed on the surface of the steel. Through cathodic protection and physical shielding, corrosive media are isolated, extending the service life.

[0003] In existing technologies, steel structure spraying typically relies on airless spraying systems. The core structure includes a high-pressure pump set, a material delivery hose, a spray gun body, and a compressed air system. These components are modularly assembled using quick-connect clamps. Compressed air output from the air compressor is connected to the pneumatic motor of the pump set via a pressure regulating valve, which pushes the piston to pressurize the paint. The high-pressure paint is delivered to the spray gun via a hose and then sprayed by the operator. Although this device can efficiently cover flat and simple curved surfaces, it has poor uniformity in covering irregularly shaped components and relies entirely on manual experience to adjust the spraying angle and distance.

[0004] Regarding the aforementioned technologies, when spraying primer onto the inner circumferential wall of cylindrical steel, it may be impossible to spray both the inner and outer circumferential walls simultaneously. This makes it difficult to adapt to steels of different pipe diameters, and manual hand-held spraying may not allow for observation of the coating condition within the enclosed space, resulting in uneven primer film thickness. This reduces the adhesion of the primer to the inner circumferential wall and lowers the corrosion resistance of the steel. Therefore, improvements are being made to address these issues. Utility Model Content

[0005] To improve the coating effect of primer on cylindrical steel, this application provides an adjustable steel structure spraying device.

[0006] The adjustable steel structure spraying device provided in this application adopts the following technical solution:

[0007] An adjustable steel structure spraying device includes a frame and a housing. The housing is located at the upper end of the frame. Two sets of housing doors are symmetrically arranged at both ends of the housing along its length. A spraying chamber and a drying chamber are arranged inside the housing. A primer tank is arranged on one side of the frame. A primer hose is connected to the primer tank. The end of the primer hose away from the primer tank is located in the spraying chamber. A spraying pump is arranged on the primer hose, with the inlet end connected to the primer tank and the outlet end connected to the primer hose. A conveying assembly for conveying cylindrical steel is arranged on the frame. A spraying mechanism for simultaneously spraying primer onto the inner and outer circumferential walls of cylindrical steel of different diameters is arranged in the spraying chamber.

[0008] By adopting the above technical solution, the cylindrical steel is placed on the frame and the shell door is opened. The conveying component in this application can convey the steel. When the steel is conveyed to the spraying chamber, the shell door is closed and the spraying pump is started. The spraying pump delivers the primer in the primer tank to the primer hose. At this time, the spraying mechanism can evenly spray the primer onto the inner and outer peripheral walls of the cylindrical steel, thereby improving the spraying effect of the primer on the cylindrical steel and enhancing the adhesion and corrosion resistance of the primer.

[0009] Optionally, the conveying assembly includes a first drive motor, a rotating shaft, and a conveyor belt. The first drive motor is fixedly mounted on the frame. There are two sets of rotating shafts, which are rotatably mounted at both ends of the frame. One set of rotating shafts is fixedly connected to the output end of the first drive motor. The conveyor belt is sleeved on the two sets of rotating shafts.

[0010] By adopting the above technical solution, the first drive motor is started, and the output end of the first drive motor rotates, which can drive the rotating shaft fixedly connected to it to rotate. Since the conveyor belt is sleeved on two sets of rotating shafts, the rotation of the rotating shaft fixedly connected to the first drive motor can drive the other set of rotating shafts and the conveyor belt to rotate, thereby realizing the conveying of cylindrical steel materials, avoiding contact between workers and steel materials during the primer spraying process, and also improving production efficiency.

[0011] Optionally, the spraying mechanism includes a valve, a telescopic tube, nozzles, and an adjusting component. The valve is disposed on the primer hose, the telescopic tube is horizontally disposed at the end of the primer hose away from the primer tank, two sets of nozzles are disposed at intervals on the telescopic end of the telescopic tube, and the adjusting component is disposed on the inner top wall of the spraying chamber for extending, rotating, and raising / lowering the telescopic tube.

[0012] By adopting the above technical solution, since the telescopic tube is connected to the primer hose and the telescopic tube has two sets of nozzles spaced apart, the primer can be delivered to the two sets of nozzles through the primer hose and the telescopic tube. The two sets of nozzles are located on the inner and outer peripheral walls of the cylindrical steel, respectively, thereby achieving primer spraying on the inner and outer peripheral walls of the cylindrical steel. Compared with the handheld spray gun spraying in the prior art, the spraying effect and coverage uniformity of the primer are improved, thereby improving the adhesion and corrosion resistance of the primer. The valve can adjust the spraying rate according to the working conditions.

[0013] Optionally, the adjustment assembly includes a second drive motor, a mounting frame, a first electric telescopic rod, and a second electric telescopic rod. The first electric telescopic rod is vertically mounted on the inner top wall of the spray chamber. The mounting frame is fixedly mounted on the telescopic end of the first electric telescopic rod. The second drive motor is fixedly mounted on the mounting frame, and its output end is fixedly connected to the end of the telescopic tube away from the nozzle. The second electric telescopic rod is horizontally mounted on the outer peripheral wall of the telescopic tube, and its telescopic end is fixedly connected to the telescopic end of the telescopic tube.

[0014] By adopting the above technical solution, the second electric telescopic rod is activated. The movement of the telescopic end of the second electric telescopic rod can drive the telescopic end of the telescopic tube and the two sets of nozzles to move, thereby realizing the adjustment of the nozzle position according to the diameter of the cylindrical steel, improving the processing capacity of steel with different diameters. After the adjustment is completed, the first electric telescopic rod is activated. The telescopic end of the first electric telescopic rod can drive the mounting frame, the second drive motor, the second electric telescopic rod, the telescopic tube, the primer hose and the two sets of nozzles to move up and down synchronously. At the same time, the second drive motor is activated. The rotation of the output end of the second drive motor can drive the telescopic tube and the two sets of nozzles to rotate, thereby realizing all-round primer spraying on the inner and outer peripheral walls of the cylindrical steel, improving the uniformity of primer coverage and spraying efficiency.

[0015] Optionally, a third electric telescopic rod is vertically installed on the inner top wall of the drying chamber, and a hot air duct is installed at the telescopic end of the third electric telescopic rod. A hot air fan is installed on one side of the frame, and a hot air hose is connected between the air outlet of the hot air fan and the hot air duct.

[0016] By adopting the above technical solution, when the steel after the primer is sprayed enters the drying chamber, the hot air blower is started. The hot air blower can deliver hot air to the hot air duct through the hot air hose. The third electric telescopic rod is started. The telescopic end of the third electric telescopic rod can drive the hot air duct to the bottom of the steel, thereby realizing the rapid drying of the sprayed primer, shortening the drying time of the primer, improving production efficiency, and the rapid drying of the primer can also improve adhesion and corrosion resistance.

[0017] Optionally, an activated carbon adsorber is provided on one side of the frame.

[0018] By adopting the above technical solution, the activated carbon adsorber can adsorb the harmful gases generated during the application of primer in the spraying room, thereby preventing the harmful gases from volatilizing to the outside and providing a safe working environment for the staff.

[0019] Optionally, the telescopic tube is provided with a connecting block for communicating with the primer hose.

[0020] By adopting the above technical solution, the connecting block is rotatably connected to the end of the telescopic tube near the second drive motor, and is also connected to the end of the primer hose away from the primer tank, thereby preventing the primer hose from rotating when the telescopic tube rotates, and also allowing the primer to be delivered into the telescopic tube.

[0021] Optionally, the outer peripheral wall of the conveyor belt is coated with an anti-stick coating.

[0022] By adopting the above technical solution, the anti-stick coating can reduce the adhesion of the primer, thereby facilitating the cleaning of the conveyor belt and reducing the difficulty and cost of cleaning.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The conveying assembly in this application can convey cylindrical steel. When the first drive motor is started, the output end of the first drive motor rotates, which can drive the rotating shaft fixedly connected to it to rotate. Since the conveyor belt is sleeved on two sets of rotating shafts, the rotation of the rotating shaft fixedly connected to the first drive motor can drive the other set of rotating shafts and the conveyor belt to rotate, thereby realizing the conveying of cylindrical steel, avoiding contact between workers and steel during the primer spraying process, and also improving production efficiency;

[0025] 2. The spraying mechanism in this application can spray primer onto cylindrical steel. Since the telescopic tube is connected to the primer hose and two sets of nozzles are spaced apart on the telescopic end of the telescopic tube, the primer can be delivered to the two sets of nozzles through the primer hose and the telescopic tube. The two sets of nozzles are located on the inner and outer peripheral walls of the cylindrical steel, thereby achieving primer spraying on the inner and outer peripheral walls of the cylindrical steel. Compared with the handheld spray gun spraying in the prior art, it improves the spraying effect and coverage uniformity of the primer, thereby improving the adhesion and corrosion resistance of the primer.

[0026] 3. The adjustment component in this application can extend, rotate, and raise / lower the telescopic tube. Activating the second electric telescopic rod allows its extension end to move, driving the extension end of the telescopic tube and the two sets of nozzles to move as well. This allows for nozzle position adjustment based on the diameter of the cylindrical steel, improving the processing capacity for steel of different diameters. After adjustment, activating the first electric telescopic rod allows its extension end to move the mounting frame, second drive motor, second electric telescopic rod, telescopic tube, primer hose, and two sets of nozzles to move synchronously. Simultaneously, activating the second drive motor allows its output end to rotate, driving the telescopic tube and the two sets of nozzles to rotate. This enables all-around primer spraying on the inner and outer walls of the cylindrical steel, improving the uniformity of primer coverage and spraying efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0029] Figure 2 This is another schematic diagram of the overall structure;

[0030] Figure 3 This is a partial structural diagram;

[0031] Figure 4 This is a schematic diagram of another part of the structure;

[0032] Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0033] Reference numerals: 1. Frame; 11. Shell; 12. Shell door; 13. Spraying chamber; 14. Drying chamber; 15. Primer tank; 16. Primer hose; 17. Spraying pump; 2. Conveying assembly; 21. First drive motor; 22. Rotating shaft; 23. Conveyor belt; 3. Spraying mechanism; 31. Valve; 32. Telescopic pipe; 33. Nozzle; 4. Adjusting assembly; 41. Second drive motor; 42. Mounting frame; 43. First electric telescopic rod; 44. Second electric telescopic rod; 5. Third electric telescopic rod; 51. Hot air blower; 52. Hot air hose; 53. Hot air duct; 6. Activated carbon adsorber; 7. Connecting block. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses an adjustable steel structure spraying device, referring to... Figure 1 , Figure 2 and Figure 3 The adjustable steel structure spraying device includes a frame 1 and a housing 11. The housing 11 is fixedly installed on the upper end of the frame 1. Two sets of housing doors 12 are symmetrically installed at both ends of the housing 11 along its length. A spraying chamber 13 and a drying chamber 14 are provided inside the housing 11. A primer tank 15 is fixedly installed on one side of the frame 1. A primer hose 16 is connected to the primer tank 15. The end of the primer hose 16 away from the primer tank 15 is fixedly installed in the spraying chamber 13. A spraying pump 17 is fixedly installed on the primer hose 16, with the inlet end connected to the primer tank 15 and the outlet end connected to the primer hose 16. A conveying assembly 2 is installed on the frame 1, and a spraying mechanism 3 is installed inside the spraying chamber 13.

[0036] The cylindrical steel is placed on the frame 1 and the housing door 12 is opened. In this embodiment, the conveying component 2 can convey the steel. When the steel is conveyed to the spraying chamber 13, the housing door 12 is closed and the spraying pump 17 is started. The spraying pump 17 conveys the primer in the primer tank 15 to the primer hose 16. At this time, the spraying mechanism 3 can evenly spray the primer onto the inner and outer peripheral walls of the cylindrical steel, thereby improving the spraying effect of the primer on the cylindrical steel and enhancing the adhesion and corrosion resistance of the primer.

[0037] Reference Figure 3 In order to avoid workers coming into contact with the steel during the spraying process, the conveying assembly 2 in this embodiment includes a first drive motor 21, a rotating shaft 22 and a conveyor belt 23. The first drive motor 21 is bolted to the frame 1. There are two sets of rotating shafts 22, which are rotatably installed at both ends of the frame 1. One set is fixedly connected to the output end of the first drive motor 21. The conveyor belt 23 is sleeved on the two sets of rotating shafts 22.

[0038] When the first drive motor 21 is started, the output end of the first drive motor 21 rotates, which drives the rotating shaft 22 fixedly connected to it to rotate. Since the conveyor belt 23 is sleeved on the two sets of rotating shafts 22, the rotation of the rotating shaft 22 fixedly connected to the first drive motor 21 can drive the other set of rotating shafts 22 and the conveyor belt 23 to rotate, thereby realizing the conveying of cylindrical steel. This avoids the workers from coming into contact with the steel during the primer spraying process and can also improve production efficiency. In this embodiment, the conveyor belt 23 is filled with support blocks, and the conveyor belt 23 is made of steel. The support blocks and the steel conveyor belt can prevent the steel from deforming the conveyor belt 23 and causing the steel to tilt.

[0039] Reference Figure 2 , Figure 3 and Figure 5Compared with the handheld spray gun spraying in the prior art, the spraying mechanism 3 in this embodiment improves the spraying effect and coverage uniformity of the primer. It includes a valve 31, a telescopic tube 32, a nozzle 33 and an adjustment component 4. The valve 31 is fixedly installed on the primer hose 16. The telescopic tube 32 is horizontally installed at the end of the primer hose 16 away from the primer tank 15. Two sets of nozzles 33 are provided. The two sets of nozzles 33 are fixedly installed at intervals on the telescopic end of the telescopic tube 32. The adjustment component 4 is installed on the inner top wall of the spraying chamber 13.

[0040] Since the telescopic tube 32 is connected to the primer hose 16, and two sets of nozzles 33 are spaced apart on the telescopic end of the telescopic tube 32, the primer can be delivered to the two sets of nozzles 33 through the primer hose 16 and the telescopic tube 32. The two sets of nozzles 33 are located on the inner and outer peripheral walls of the cylindrical steel, respectively, thereby achieving primer spraying on the inner and outer peripheral walls of the cylindrical steel. Compared with the handheld spray gun spraying in the prior art, the spraying effect and coverage uniformity of the primer are improved, thereby improving the adhesion and corrosion resistance of the primer. The valve 31 can adjust the spraying rate according to the working conditions.

[0041] Reference Figure 4 and Figure 5 When the nozzle 33 is used to spray primer onto the cylindrical steel, it needs to be raised, lowered, and rotated. Therefore, the adjustment component 4 in this embodiment includes a second drive motor 41, a mounting frame 42, a first electric telescopic rod 43, and a second electric telescopic rod 44. The first electric telescopic rod 43 is vertically bolted to the inner top wall of the spray chamber 13. The mounting frame 42 is welded to the telescopic end of the first electric telescopic rod 43. The second drive motor 41 is bolted to the mounting frame 42, and its output end is fixedly connected to the end of the telescopic tube 32 away from the nozzle 33. The second electric telescopic rod 44 is horizontally welded to the outer peripheral wall of the telescopic tube 32, and its telescopic end is fixedly connected to the telescopic end of the telescopic tube 32. In this embodiment, a corrugated pipe is provided inside the fixed end of the telescopic tube 32. One end of the corrugated pipe is connected to the telescopic end of the telescopic tube 32, and the other end is connected to the primer hose 16. The fixed end of the telescopic tube 32 can prevent the corrugated pipe from bending.

[0042] The second electric telescopic rod 44 is activated. The movement of the telescopic end of the second electric telescopic rod 44 can drive the telescopic end of the telescopic tube 32 and the two sets of nozzles 33 to move, thereby adjusting the position of the nozzles 33 according to the diameter of the cylindrical steel, improving the processing capacity for steel with different diameters. After adjustment, the first electric telescopic rod 43 is activated. The telescopic end of the first electric telescopic rod 43 can drive the mounting frame 42, the second drive motor 41, the second electric telescopic rod 44, the telescopic tube 32, the primer hose 16 and the two sets of nozzles 33 to move up and down synchronously. At the same time, the second drive motor 41 is activated. The rotation of the output end of the second drive motor 41 can drive the telescopic tube 32 and the two sets of nozzles 33 to rotate, thereby achieving all-round primer spraying on the inner and outer circumference of the cylindrical steel, improving the uniformity of primer coverage and spraying efficiency.

[0043] In this embodiment, the second drive motor 41 is covered with a housing 11. The housing 11 can prevent paint mist generated during primer spraying from entering the second drive motor 41, thereby improving the safety of the second drive motor 41. In addition, in this embodiment, two sets of second electric telescopic rods 44 and telescopic tubes 32 are symmetrically arranged, and four sets of nozzles 33 are symmetrically arranged. The two sets of second electric telescopic rods 44 and telescopic tubes 32 and the four sets of nozzles 33 can further improve the primer spraying efficiency.

[0044] Reference Figure 3 After the primer is applied, the steel needs to be dried quickly. Therefore, in this embodiment, a third electric telescopic rod 5 is installed on the inner top wall of the drying chamber 14 with vertical bolts. A hot air tube 53 is welded to the telescopic end of the third electric telescopic rod 5. A hot air blower 51 is fixedly installed on one side of the frame 1. A hot air hose 52 is connected between the air outlet of the hot air blower 51 and the hot air tube 53.

[0045] When the steel after the primer is applied enters the drying chamber 14, the hot air blower 51 is started. The hot air blower 51 delivers hot air to the hot air duct 53 through the hot air hose 52. The third electric telescopic rod 5 is started. The telescopic end of the third electric telescopic rod 5 can drive the hot air duct 53 to the bottom of the steel, thereby realizing the rapid drying of the sprayed primer, shortening the drying time of the primer, improving production efficiency, and the rapid drying of the primer can also improve adhesion and corrosion resistance.

[0046] Reference Figure 1 To prevent harmful gases from evaporating to the outside, an activated carbon adsorber 6 is fixedly installed on one side of the frame 1 in this embodiment. The activated carbon adsorber 6 can adsorb the harmful gases generated when the primer is sprayed in the spraying chamber 13, thereby providing a safe working environment for the staff.

[0047] Reference Figure 5When the telescopic tube 32 rotates, it may drive the primer hose 16 to rotate as well. In order to prevent the primer hose 16 from rotating synchronously, a connecting block 7 is fixedly installed on the housing 11 of the second drive motor 41 in this embodiment. The connecting block 7 is rotatably connected to the end of the telescopic tube 32 near the second drive motor 41 and is connected to the end of the primer hose 16 away from the primer tank 15. This prevents the primer hose 16 from rotating synchronously while still delivering the primer into the telescopic tube 32.

[0048] Reference Figure 3 During primer spraying, some primer may adhere to the conveyor belt 23. Therefore, in this embodiment, the outer peripheral wall of the conveyor belt 23 is coated with an anti-stick coating. The anti-stick coating can reduce the adhesion of the primer, thereby facilitating the cleaning of the conveyor belt 23, reducing the cleaning difficulty and cleaning cost. In this embodiment, the anti-stick coating is made of polytetrafluoroethylene (PTFE), which is a preferred material in this embodiment. It can also be made of silicone composite material, etc.

[0049] The implementation principle of the adjustable steel structure spraying device in this application embodiment is as follows:

[0050] When the first drive motor 21 is started, the output end of the first drive motor 21 rotates, driving the rotating shaft 22 fixedly connected to it to rotate. Since the conveyor belt 23 is sleeved on the two sets of rotating shafts 22, the rotation of the rotating shaft 22 fixedly connected to the first drive motor 21 can drive the other set of rotating shafts 22 and the conveyor belt 23 to rotate, thereby realizing the conveying of cylindrical steel, avoiding contact between workers and steel during the primer spraying process, and also improving production efficiency;

[0051] Since the telescopic tube 32 is connected to the primer hose 16, and two sets of nozzles 33 are installed at intervals on the telescopic end of the telescopic tube 32, the primer can be delivered to the two sets of nozzles 33 through the primer hose 16 and the telescopic tube 32. The two sets of nozzles 33 are located on the inner and outer peripheral walls of the cylindrical steel, thereby achieving primer spraying on the inner and outer peripheral walls of the cylindrical steel. Compared with the handheld spray gun spraying in the prior art, the spraying effect and coverage uniformity of the primer are improved, thereby improving the adhesion and corrosion resistance of the primer.

[0052] The second electric telescopic rod 44 is activated. The telescopic end of the second electric telescopic rod 44 moves, causing the telescopic end of the telescopic tube 32 and the two sets of nozzles 33 to move, thereby adjusting the position of the nozzles 33 according to the diameter of the cylindrical steel, improving the processing capacity for steel with different diameters. After adjustment, the first electric telescopic rod 43 is activated. The telescopic end of the first electric telescopic rod 43 can drive the mounting frame 42, the second drive motor 41, the second electric telescopic rod 44, the telescopic tube 32, the primer hose 16, and the two sets of nozzles 33 to move up and down synchronously. At the same time, the second drive motor 41 is activated. The output end of the second drive motor 41 rotates, which drives the telescopic tube 32 and the two sets of nozzles 33 to rotate, thereby achieving all-round primer spraying on the inner and outer circumference of the cylindrical steel, improving the uniformity of primer coverage and spraying efficiency.

[0053] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An adjustable steel structure painting device, characterized by: The device includes a frame (1) and a housing (11). The housing (11) is located at the upper end of the frame (1). Two sets of housing doors (12) are symmetrically arranged at both ends of the housing (11) along its length. A spraying chamber (13) and a drying chamber (14) are arranged inside the housing (11). A primer tank (15) is arranged on one side of the frame (1). A primer hose (16) is connected to the primer tank (15). The primer hose (16) is located away from the primer tank. One end of (15) is located in the spraying chamber (13). A spraying pump (17) is provided on the primer hose (16), and the inlet end is connected to the primer tank (15), and the outlet end is connected to the primer hose (16). A conveying assembly (2) for conveying cylindrical steel is provided on the frame (1). A spraying mechanism (3) for simultaneously spraying primer on the inner and outer circumferential walls of cylindrical steel with different diameters is provided in the spraying chamber (13).

2. An adjustable steel structure painting device according to claim 1, characterized in that: The conveying assembly (2) includes a first drive motor (21), a rotating shaft (22) and a conveyor belt (23). The first drive motor (21) is fixedly mounted on the frame (1). There are two sets of rotating shafts (22), which are rotatably mounted at both ends of the frame (1). One set is fixedly connected to the output end of the first drive motor (21). The conveyor belt (23) is sleeved on the two sets of rotating shafts (22).

3. An adjustable steel structure painting device according to claim 1, characterized in that: The spraying mechanism (3) includes a valve (31), a telescopic tube (32), a nozzle (33), and an adjustment component (4). The valve (31) is located on the primer hose (16). The telescopic tube (32) is horizontally located at one end of the primer hose (16) away from the primer tank (15). There are two sets of nozzles (33), which are spaced apart on the telescopic end of the telescopic tube (32). The adjustment component (4) is located on the inner top wall of the spraying chamber (13) and is used to extend, rotate, and raise / lower the telescopic tube (32).

4. An adjustable steel structure painting device according to claim 3, characterized in that: The adjustment assembly (4) includes a second drive motor (41), a mounting frame (42), a first electric telescopic rod (43), and a second electric telescopic rod (44). The first electric telescopic rod (43) is vertically mounted on the inner top wall of the spray chamber (13). The mounting frame (42) is fixedly mounted on the telescopic end of the first electric telescopic rod (43). The second drive motor (41) is fixedly mounted on the mounting frame (42), and its output end is fixedly connected to the end of the telescopic tube (32) away from the nozzle (33). The second electric telescopic rod (44) is horizontally mounted on the outer peripheral wall of the telescopic tube (32), and its telescopic end is fixedly connected to the telescopic end of the telescopic tube (32).

5. An adjustable steel structure painting device according to claim 1, characterized in that: A third electric telescopic rod (5) is vertically installed on the inner top wall of the drying chamber (14). A hot air duct (53) is installed at the telescopic end of the third electric telescopic rod (5). A hot air blower (51) is installed on one side of the frame (1). A hot air hose (52) is connected between the air outlet of the hot air blower (51) and the hot air duct (53).

6. The adjustable steel structure spraying device according to claim 1, characterized in that: An activated carbon adsorber (6) is provided on one side of the frame (1).

7. An adjustable steel structure spraying device according to claim 3, characterized in that: The telescopic tube (32) is provided with a connecting block (7) for connecting the telescopic tube (32) and the primer hose (16).

8. An adjustable steel structure spraying device according to claim 2, characterized in that: The outer peripheral wall of the conveyor belt (23) is coated with an anti-stick coating.

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