Steel surface corrosion-resistant treatment method and equipment

Abstract

The invention relates to the technical field of steel processing, and discloses a steel surface corrosion-resistant treatment method and equipment, the equipment comprises a bottom frame, and one side of the bottom frame is provided with a coating assembly for synchronously coating the outer surface and the inner surface of a steel pipe with a corrosion-resistant coating; the coating assembly comprises a liquid storage tank, the liquid storage tank is fixedly connected to one side of the bottom frame through a support, one side of the liquid storage tank is connected with a conveying pipe in a penetrating mode, a conveying pump is installed in the middle of the conveying pipe in a penetrating mode, one end of the conveying pipe is connected with a flow dividing pipe in a penetrating mode, and one end of the flow dividing pipe is connected with a longitudinal folding pipe in a penetrating mode. Efficient and automatic operation of anticorrosion treatment of the inner wall and the outer wall of the steel pipe is achieved, the distance can be adjusted through an electric cylinder, different pipe wall thicknesses can be adapted, clamping assemblies stably limit the two ends of the steel pipe through the synergistic effect of inner clamping plates, outer clamping plates and rotating rings, a drying assembly is in linkage with a coating unit, hot air is blown out immediately after coating, and surface drying and curing of a coating are accelerated; and sagging is reduced.

Description

Technical Field

[0001] This invention relates to the field of steel processing technology, and in particular to a method and equipment for surface corrosion resistance treatment of steel. Background Technology

[0002] Steel is a material with specific shape, size and properties made from steel ingots, billets or steel through pressure processing. Its core component is iron-carbon alloy and contains elements such as silicon, manganese, sulfur and phosphorus. Steel pipe is a tubular material with a hollow cross section. Its length is much greater than its outer diameter or side length. Because steel has poor corrosion resistance, its surface needs to be coated with a protective anti-corrosion coating.

[0003] Currently, the main methods for anti-corrosion treatment of steel pipes include spraying, dip coating, electroplating, and hot-dip galvanizing. These traditional methods generally have some limitations: for example, spraying is difficult to ensure the uniformity and integrity of the coating on the inner wall of the steel pipe; dip coating consumes a large amount of paint and the thickness of the inner wall coating is not easy to control; electroplating and hot-dip galvanizing processes involve complex equipment, high energy consumption, and may cause environmental pollution problems. In particular, for hollow pipes that require long-term anti-corrosion treatment of both the inner and outer walls, the existing technology often requires manual coating of the steel pipe surface in steps, with repeated coating operations, which is cumbersome and results in low efficiency of coating anti-corrosion coatings on the steel pipe surface. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method and equipment for surface corrosion resistance treatment of steel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a steel surface corrosion resistant treatment device, including a base frame, wherein a coating component for simultaneously applying anti-corrosion coating to the outer and inner surfaces of steel pipes is provided on one side of the base frame; The coating assembly includes a liquid storage tank, which is fixedly connected to one side of the base frame via a bracket. A delivery pipe is connected through one side of the liquid storage tank, and a delivery pump is installed through the middle of the delivery pipe. A diversion pipe is connected through one end of the delivery pipe, and a longitudinally folded pipe is connected through one end of the diversion pipe. A bending pipe is connected through one end of the longitudinally folded pipe, and a transversely folded pipe is connected through one end of the bending pipe and the other end of the diversion pipe.

[0006] As a further description of the above technical solution: One end of the transversely folded tube is connected to a U-shaped tube, and both ends of the U-shaped tube are rotatably connected to rotating tubes. The rotating tubes have multiple liquid outlet holes on their exterior and an applicator roller is provided on their exterior.

[0007] As a further description of the above technical solution: A rack rod is fixedly connected to the middle of one side of the U-shaped tube, and side rods are fixedly connected to both sides of the rack rod. A fixed frame is fixedly connected to one side of the upper surface of the base frame, and a lower frame is fixedly connected to one side of the fixed frame. An upper frame is slidably connected inside the lower frame. The bending tube is fixedly connected to the inner wall of the upper frame, and the diverter tube is fixedly connected to the inner wall of the lower frame. An electric cylinder is fixedly installed on one side of the interior of the lower frame, and the output end of the electric cylinder is fixedly connected to the bottom side of the upper frame.

[0008] As a further description of the above technical solution: A stepper motor is fixedly installed on one side of both the lower and upper frames. The output end of the stepper motor is fixedly connected to a gear through a shaft. The gear and the rack are meshed. A cross groove is opened inside both the lower and upper frames. The rack is connected through the cross groove. The two side rods are slidably connected inside the cross groove.

[0009] As a further description of the above technical solution: The upper surface of the base frame is provided with a clamping assembly for clamping and fixing one end of the steel pipe. The clamping assembly includes a variable speed motor, which is fixedly installed on the other side of the upper surface of the base frame. The output end of the variable speed motor is fixedly connected to a transmission frame, and a round shell is fixedly connected to one side of the transmission frame.

[0010] As a further description of the above technical solution: Multiple electric cylinders are fixedly installed on the outside of the circular shell. The multiple electric cylinders are distributed on the top, bottom and middle of one side of the circular shell. The output ends of two of the electric cylinders are fixedly connected to outer clamping plates, and the output ends of the other two electric cylinders are fixedly connected to inner clamping plates.

[0011] As a further description of the above technical solution: A hydraulic cylinder is fixedly installed on one side of the base frame. An upright annular frame is fixedly connected to the output end of the hydraulic cylinder. A rotating ring is rotatably connected inside the upright annular frame. The upright annular frame is slidably connected to the inside of the upper surface of the base frame.

[0012] As a further description of the above technical solution: A drying assembly for blowing hot air onto steel pipes coated with anti-corrosion paint is provided on one side of the base frame. The drying assembly includes a hot air blower, the output end of which is connected to an air supply pipe. One end of the air supply pipe is connected to a corrugated angle pipe, which is fixedly connected to one side of the inner wall of the lower and upper frames.

[0013] As a further description of the above technical solution: Both ends of the corrugated angle tube are connected to corrugated tubes, and one end of the corrugated tube is connected to a T-shaped air outlet tube. The T-shaped air outlet tube is fixedly connected to one side of the U-shaped tube, and multiple air outlet holes are opened on one side of the T-shaped air outlet tube.

[0014] This invention also provides a method for surface corrosion-resistant treatment of steel, using the aforementioned surface corrosion-resistant treatment equipment for steel, and the method of use is as follows: Step 1: Place the steel pipe on the base frame and start the electric cylinder 2 of the clamping assembly. Use the inner and outer clamping plates to clamp one end of the steel pipe from both the inside and outside to fix it in the round shell. Then start the hydraulic cylinder to drive the rotating ring to move laterally. Use the rotating ring to press the other end of the steel pipe against it and limit the other end. Then start the variable speed motor to make the steel pipe rotate at a constant speed. Step 2: When the steel pipe is fixed, the coating roller at the bottom will be on the inner wall of the steel pipe and in contact with the inner wall of the steel pipe. Then, start the electric cylinder one to adjust the height of the upper frame so that the upper rotating tube and coating roller are aligned with the outer wall of the steel pipe and in contact with the outer wall. Then start the delivery pump to pump the anti-corrosion coating in the storage tank into the delivery pipeline until the coating reaches the position of the rotating tube. Step 3: The coating seeps out from the outlet of the rotating tube to the coating roller. Start the stepper motor, and through the meshing of the gear and rack, drive the U-shaped tube to move smoothly along the cross groove, so that the coating roller can evenly apply the anti-corrosion coating to the inner and outer surfaces of the rotating steel tube. Step 4: Start the hot air blower. Hot air is blown onto the coated steel pipe surface through the air supply pipe, corrugated corner pipe and T-shaped air outlet pipe. After the steel pipe is coated, the coated surface of the steel pipe is blown with air in time to accelerate the surface drying and curing of the coating and form a complete corrosion-resistant protective layer. Step 5: After processing is complete, stop all power units, release the clamping assembly, remove the steel pipe, return the coating assembly to its initial position, clean the equipment, and the operation is complete.

[0015] The present invention has the following beneficial effects: 1. This invention, through the setting of the coating assembly, utilizes coating rollers located on the outer and inner surfaces of the steel pipe and in contact with the steel pipe, which can move synchronously. Under the conveying action of the coating material by the U-shaped tube, rotating tube, transverse folding tube, bending tube, and longitudinal folding tube, and relying on the supporting force formed by the side rod on the U-shaped tube and the transverse driving force generated by the rack rod on the U-shaped tube, the synchronous, continuous, and automated coating of the anti-corrosion coating on the inner and outer walls of the steel pipe is realized. It eliminates the tedious work of manually coating the outer surface of the steel pipe and then coating the inner surface after drying, which significantly improves the work efficiency and helps to improve the consistency of the inner and outer coating quality. The coating rollers located at the top and bottom are driven by the upper and lower frames through the electric cylinder, which makes it easy to adjust their spacing according to the thickness of the steel pipe, thus improving the adaptability to steel pipes of different thicknesses.

[0016] 2. This invention, through the design of the clamping assembly, utilizes the outer clamping plates on both sides to easily clamp the outer surface of one end of the steel pipe, while the inner clamping plate facilitates further clamping and fixing the inner surface of one end of the steel pipe, thereby improving the stability of the steel pipe after clamping. Furthermore, the rotating ring, which is supported laterally by the upright annular frame, helps to press against the other end of the steel pipe, thus limiting the steel pipe between the circular shell and the rotating ring, further improving the stability of the steel pipe during the coating process. Finally, the transmission frame transmits the rotational power from the output end of the variable speed motor to the circular shell, enabling the steel pipe to rotate, which helps to improve the uniformity of the coating assembly on the steel pipe, thereby improving the coating quality.

[0017] 3. The present invention utilizes the setting of the drying component, which facilitates the simultaneous lateral movement of the T-shaped air outlet pipe during the coating process of the steel pipe and the lateral movement of the U-shaped frame. This helps to spray hot air from the T-shaped air outlet pipe onto the coated area after the coating roller has coated the steel pipe surface, thereby facilitating the drying process, initially curing the coating, reducing coating sagging, and thus improving coating quality and drying speed.

[0018] This invention achieves highly efficient and automated anti-corrosion treatment of the inner and outer walls of steel pipes through integrated design. The coating assembly utilizes upper and lower arranged coating rollers in conjunction with U-shaped tubes, rotating tubes, and multiple pipe sections, moving synchronously under the drive of gears and racks to complete continuous and uniform coating of the inner and outer walls. The spacing can be adjusted by an electric cylinder to adapt to different pipe wall thicknesses. The clamping assembly uses inner and outer clamping plates and a rotating ring to stably limit the two ends of the steel pipe, and is driven to rotate by a variable speed motor to ensure coating uniformity. The drying assembly is linked with the coating unit, blowing hot air immediately after coating to accelerate the surface drying and curing of the coating, reduce sagging, and improve coating quality and drying efficiency. The entire system significantly improves work efficiency, coating consistency, and equipment adaptability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a schematic diagram of the upright annular tube structure proposed in this invention; Figure 3 This is a schematic diagram of the T-shaped air outlet duct structure proposed in this invention; Figure 4 This is a schematic diagram of the U-shaped tube structure proposed in this invention; Figure 5 This is a schematic diagram of the fixing frame structure proposed in this invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the lower frame proposed in this invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the circular shell proposed in this invention.

[0020] Legend: 1. Base frame; 2. Liquid storage tank; 3. Delivery pipe; 4. Delivery pump; 5. Diverter pipe; 6. Longitudinal folded pipe; 7. Bending pipe; 8. Transverse folded pipe; 9. U-shaped pipe; 10. Rotating pipe; 11. Liquid outlet; 12. Spreading roller; 13. Rack and pinion; 14. Side rod; 15. Fixing frame; 16. Lower frame; 17. Upper frame; 18. Stepper motor; 19. Gear; 20. Electric cylinder one; 21. Variable speed motor; 22. Transmission frame; 23. Round shell; 24. Electric cylinder two; 25. Outer clamping plate; 26. Inner clamping plate; 27. Hydraulic cylinder; 28. Upright ring frame; 29. ​​Rotating ring; 30. Hot air blower; 31. Air supply pipe; 32. Corrugated angled pipe; 33. Corrugated pipe; 34. T-shaped air outlet pipe. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Example 1: As attached Figure 1-7 As shown, one embodiment of the present invention provides: a surface corrosion-resistant treatment device for steel, including a base frame 1, and a coating component for simultaneously applying anti-corrosion coating to the outer and inner surfaces of steel pipes is provided on one side of the base frame 1; The coating assembly includes a liquid storage tank 2, which is fixedly connected to one side of the base frame 1 via a bracket. A delivery pipe 3 is connected through one side of the liquid storage tank 2. A delivery pump 4 is installed through the middle of the delivery pipe 3 to facilitate the delivery of coating. A diversion pipe 5 for diverting the flow is connected through one end of the delivery pipe 3. A longitudinally retractable and foldable longitudinal folding pipe 6 is connected through one end of the longitudinal folding pipe 6. A bending pipe 7 is connected through one end of the bending pipe 7 and the other end of the diversion pipe 5. A transversely retractable and foldable transverse folding pipe 8 is connected through both the bending pipe 7 and the diversion pipe 5.

[0023] As attached Figure 4 As shown, one end of the transverse folded tube 8 is connected to a U-shaped tube 9, and both ends of the U-shaped tube 9 are rotatably connected to a rotating tube 10. The rotating tube 10 has multiple outlet holes 11 for discharging coating liquid on its outside. The rotating tube 10 is equipped with a coating roller 12 that can absorb coating liquid and apply the coating liquid to the surface of the steel pipe.

[0024] As attached Figure 2 As shown, a rack rod 13 is fixedly connected to the middle of one side of the U-shaped tube 9 to drive the U-shaped tube 9 to move laterally, and side rods 14 are fixedly connected to both sides of the rack rod 13 to facilitate the stable lateral movement of the U-shaped tube 9.

[0025] As attached Figure 5As shown, a fixed frame 15 is fixedly connected to one side of the upper surface of the base frame 1, and a U-shaped lower frame 16 with hollow interiors on both sides is fixedly connected to one side of the fixed frame 15.

[0026] As attached Figure 6 As shown, the lower frame 16 has an internally slidingly connected upper frame 17 that is adjustable in height and has a U-shape. The bent tube 7 is fixedly connected to the inner wall of the upper frame 17, and the diverter tube 5 is fixedly connected to the inner wall of the lower frame 16. An electric cylinder 20 is fixedly installed on one side of the lower frame 16. The output end of the electric cylinder 20 is fixedly connected to the bottom side of the upper frame 17. Both the lower frame 16 and the upper frame 17 have a stepper motor 18 whose output end can rotate in both directions. The output end of the stepper motor 18 is fixedly connected to a gear 19 for transmitting rotational force through a shaft. The gear 19 and the rack 13 are meshed, which facilitates the conversion of rotation into linear lateral movement. Both the lower frame 16 and the upper frame 17 have cross grooves inside to limit the rack 13 and the side rods 14. The rack 13 is connected through the cross groove, and the two side rods 14 are slidably connected inside the cross groove.

[0027] The implementation principle of this embodiment is as follows: The coating process is performed by the coating component. The delivery pump 4 is started, and the anti-corrosion coating in the storage tank 2 is pumped out through the delivery pipe 3 and delivered to the upper and lower paths through the diversion pipe 5. The coating enters the transverse folding pipes 8 on both sides through the longitudinal folding pipe 6, the bending pipe 7 or directly through the diversion pipe 5, and finally flows into the U-shaped pipe 9 and reaches the two rotating pipes 10. The electric cylinder 20 is activated, driving the upper frame 17 to rise and fall relative to the lower frame 16, thereby driving the coating roller 12 in the upper coating unit to adjust to the position of contact with the outer wall of the steel pipe, while the lower coating unit contacts the inner wall of the steel pipe. The coating seeps out from the multiple liquid outlet holes 11 on the surface of the rotating pipe 10 and wets the coating roller 12 wrapped around the outside of the rotating pipe 10. As the steel pipe rotates at a constant speed driven by the variable speed motor 21, the stepper motor 18, mounted on the lower frame 16 and the upper frame 17, starts to drive the output end to rotate, which in turn drives the gear 19 to rotate. The gear 19 meshes with the rack 13 fixed on the U-shaped tube 9, thereby pushing the entire assembly of the U-shaped tube 9, the rotating tube 10, and the coating roller 12 to move smoothly and at a constant speed axially along the direction of the cross grooves opened inside the lower frame 16 and the upper frame 17. During this process, the coating roller 12, which is wetted with paint, rolls on the inner and outer walls of the steel pipe along with the rotating tube 10, evenly applying the paint to the inner and outer surfaces of the rotating steel pipe, completing synchronous coating.

[0028] Example 2: Based on the above embodiments, this implementation discloses a surface corrosion-resistant treatment device for steel, as shown in the attached figure. Figure 2As shown, the upper surface of the base frame 1 is provided with a clamping assembly for clamping and fixing one end of the steel pipe. The clamping assembly includes a variable speed motor 21, which is fixedly installed on the other side of the upper surface of the base frame 1. The output end of the variable speed motor 21 is fixedly connected to a transmission frame 22 that transmits rotational force. A circular shell 23 that limits one end of the steel pipe is fixedly connected to one side of the transmission frame 22. Multiple electric cylinders 24 for outputting pressure are fixedly installed on the outside of the circular shell 23. The multiple electric cylinders 24 are distributed at the top and bottom and the middle of one side of the circular shell 23.

[0029] As attached Figure 7 As shown, the output ends of two electric cylinders 24 are fixedly connected to outer clamping plates 25 that clamp the outer wall of the steel pipe, and the output ends of the other two electric cylinders 24 are fixedly connected to inner clamping plates 26 that clamp the inner wall of the steel pipe.

[0030] As attached Figure 1 As shown, a hydraulic cylinder 27 for driving the vertical ring frame 28 to move laterally is fixedly installed on one side of the base frame 1.

[0031] As attached Figure 2 As shown, the output end of the hydraulic cylinder 27 is fixedly connected to an upright annular frame 28, which is annular in shape and supported by a square plate at the bottom. The interior of the upright annular frame 28 is rotatably connected to a rotating ring 29 that contacts and presses against the other end of the steel pipe. The upright annular frame 28 is slidably connected to the interior of the upper surface of the base frame 1.

[0032] The implementation principle of this embodiment is as follows: First, the steel pipe to be processed is placed horizontally inside the circular shell 23 of the base frame 1. The clamping assembly starts to work. Multiple electric cylinders 24 drive two outer clamping plates 25 to clamp the outer wall of one end of the steel pipe, while two inner clamping plates 26 clamp the inner wall of one end of the steel pipe, so that one end of the steel pipe is fixed. Then, the hydraulic cylinder 27 drives the upright ring frame 28 and the rotating ring 29 to press against the other end of the steel pipe, thereby providing auxiliary support and limiting. Then, the variable speed motor 21 is turned on, and its output end drives the circular shell 23 to rotate, which drives the fixed steel pipe to rotate, so that the steel pipe can be evenly coated.

[0033] Example 3: Based on the above embodiments, this implementation discloses a surface corrosion-resistant treatment device for steel, as shown in the attached figure. Figure 3As shown, a drying assembly for blowing hot air onto steel pipes coated with anti-corrosion paint is provided on one side of the base frame 1. The drying assembly includes a hot air blower 30 for outputting hot air. An air supply pipe 31 is connected to the output end of the hot air blower 30. One end of the air supply pipe 31 is connected to a U-shaped corrugated corner pipe 32 with retractable and foldable corrugated folding pipes on both sides of the middle. The corrugated corner pipe 32 is fixedly connected to one side of the inner wall of the lower frame 16 and the upper frame 17. Both ends of the corrugated corner pipe 32 are connected to retractable and foldable corrugated pipes 33. One end of the corrugated pipe 33 is connected to a T-shaped and bent T-shaped air outlet pipe 34. The T-shaped air outlet pipe 34 is fixedly connected to one side of the U-shaped pipe 9. Multiple air outlet holes for air outlet are opened on one side of the T-shaped air outlet pipe 34.

[0034] The implementation principle of this embodiment is as follows: the coating is carried out simultaneously when the coating is completed. The drying component is started and the hot air generated by the hot air blower 30 is transported through the air duct 31 and distributed to the corrugated pipes 33 on both sides through the corrugated corner pipe 32. Finally, it is blown out from multiple air outlets on the T-shaped air outlet pipe 34 fixed to one side of the U-shaped pipe 9, and directly acts on the surface of the coating that has just been coated. The hot air accelerates the evaporation of the solvent in the coating and promotes the surface drying and initial curing of the coating.

[0035] This invention also provides a method for surface corrosion-resistant treatment of steel, using the aforementioned surface corrosion-resistant treatment equipment for steel, and the method of use is as follows: Step 1: Place the steel pipe on the base frame 1, start the electric cylinder 24 of the clamping assembly, and use the inner clamping plate 26 and the outer clamping plate 25 to clamp one end of the steel pipe from the inside and outside to fix it in the round shell 23. Then start the hydraulic cylinder 27 to drive the rotating ring 29 to move laterally, and use the rotating ring 29 to press the other end of the steel pipe and limit the other end. Then start the variable speed motor 21 to make the steel pipe rotate at a uniform speed. Step 2: When the steel pipe is fixed, the coating roller 12 at the bottom will be on the inner wall of the steel pipe and in contact with the inner wall of the steel pipe. Then, start the electric cylinder 20 to adjust the height of the upper frame 17 so that the upper rotating tube 10 and the coating roller 12 are aligned with the outer wall of the steel pipe and in contact with the outer wall. Then start the delivery pump 4 to pump the anti-corrosion coating in the storage tank 2 into the delivery pipeline until the coating reaches the position of the rotating tube 10. Step 3: The coating seeps out from the outlet hole 11 of the rotating tube 10 to the coating roller 12. Start the stepper motor 18, which meshes with the rack rod 13 through the gear 19, and drive the U-shaped tube 9 to move smoothly along the cross groove, so that the coating roller 12 can evenly apply the anti-corrosion coating to the inner and outer surfaces of the rotating steel tube. Step 4: Start the hot air blower 30. Hot air is blown onto the coated steel pipe surface through the air supply pipe 31, the corrugated angle pipe 32 and the T-shaped air outlet pipe 34. After the steel pipe is coated, the coated surface of the steel pipe is blown with air in time to accelerate the surface drying and curing of the coating and form a complete corrosion-resistant protective layer. Step 5: After processing is complete, stop all power units, release the clamping assembly, remove the steel pipe, return the coating assembly to its initial position, clean the equipment, and the operation is complete.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface corrosion-resistant treatment device for steel, comprising a base frame (1), characterized in that: One side of the base frame (1) is provided with a coating component for simultaneously applying anti-corrosion coating to the outer and inner surfaces of the steel pipe; The coating assembly includes a liquid storage tank (2), which is fixedly connected to one side of the base frame (1) by a bracket. A delivery pipe (3) is connected through one side of the liquid storage tank (2). A delivery pump (4) is installed through the middle of the delivery pipe (3). A diversion pipe (5) is connected through one end of the delivery pipe (3). A longitudinal folded pipe (6) is connected through one end of the diversion pipe (5). A bent pipe (7) is connected through one end of the longitudinal folded pipe (6). A transverse folded pipe (8) is connected through one end of the bent pipe (7) and the other end of the diversion pipe (5).

2. The surface corrosion-resistant treatment equipment for steel according to claim 1, characterized in that: One end of the transverse folded tube (8) is connected to a U-shaped tube (9), and the two ends of the U-shaped tube (9) are rotatably connected to a rotating tube (10). The rotating tube (10) has multiple liquid outlet holes (11) on its outside, and an applicator roller (12) is provided on the outside of the rotating tube (10).

3. The steel surface corrosion-resistant treatment equipment according to claim 2, characterized in that: A rack rod (13) is fixedly connected to the middle of one side of the U-shaped tube (9). Side rods (14) are fixedly connected to both sides of the rack rod (13). A fixed frame (15) is fixedly connected to one side of the upper surface of the base frame (1). A lower frame (16) is fixedly connected to one side of the fixed frame (15). An upper frame (17) is slidably connected inside the lower frame (16). The bent tube (7) is fixedly connected to the inner wall of the upper frame (17). The diverter tube (5) is fixedly connected to the inner wall of the lower frame (16). An electric cylinder (20) is fixedly installed on one side of the interior of the lower frame (16). The output end of the electric cylinder (20) is fixedly connected to the bottom side of the upper frame (17).

4. The surface corrosion-resistant treatment equipment for steel according to claim 3, characterized in that: A stepper motor (18) is fixedly installed on one side of both the lower frame (16) and the upper frame (17). The output end of the stepper motor (18) is fixedly connected to a gear (19) through a shaft. The gear (19) is meshed with the rack (13). Both the lower frame (16) and the upper frame (17) have cross grooves inside. The rack (13) is connected through the inside of the cross groove. The two side rods (14) are slidably connected inside the cross groove.

5. The surface corrosion-resistant treatment equipment for steel according to claim 1, characterized in that: The upper surface of the base frame (1) is provided with a clamping assembly for clamping and fixing one end of the steel pipe. The clamping assembly includes a variable speed motor (21). The variable speed motor (21) is fixedly installed on the other side of the upper surface of the base frame (1). The output end of the variable speed motor (21) is fixedly connected to a transmission frame (22). A round shell (23) is fixedly connected to one side of the transmission frame (22).

6. The surface corrosion-resistant treatment equipment for steel according to claim 5, characterized in that: Multiple electric cylinders (24) are fixedly installed on the outside of the circular shell (23). The multiple electric cylinders (24) are distributed on the top, bottom and middle of one side of the circular shell (23). The output ends of two of the electric cylinders (24) are fixedly connected to outer clamping plates (25), and the output ends of the other two electric cylinders (24) are fixedly connected to inner clamping plates (26).

7. The surface corrosion-resistant treatment equipment for steel according to claim 1, characterized in that: A hydraulic cylinder (27) is fixedly installed on one side of the base frame (1). An upright ring frame (28) is fixedly connected to the output end of the hydraulic cylinder (27). A rotating ring (29) is rotatably connected inside the upright ring frame (28). The upright ring frame (28) is slidably connected to the inside of the upper surface of the base frame (1).

8. The surface corrosion-resistant treatment equipment for steel according to claim 1, characterized in that: A drying assembly for blowing hot air onto steel pipes coated with anti-corrosion paint is provided on one side of the base frame (1). The drying assembly includes a hot air blower (30). An air supply pipe (31) is connected through the output end of the hot air blower (30). A corrugated angle pipe (32) is connected through one end of the air supply pipe (31). The corrugated angle pipe (32) is fixedly connected to one side of the inner wall of the lower frame (16) and the upper frame (17).

9. The steel surface corrosion-resistant treatment equipment according to claim 8, characterized in that: Both ends of the corrugated angle tube (32) are connected to a corrugated tube (33), and one end of the corrugated tube (33) is connected to a T-shaped air outlet tube (34). The T-shaped air outlet tube (34) is fixedly connected to one side of the U-shaped tube (9), and multiple air outlet holes are opened on one side of the T-shaped air outlet tube (34).

10. A method for surface corrosion resistance treatment of steel, using the surface corrosion resistance treatment equipment for steel according to any one of claims 1-9, characterized in that, The usage method is as follows: Step 1: Place the steel pipe on the base frame (1), start the electric cylinder 2 (24) of the clamping assembly, use the inner clamping plate (26) and the outer clamping plate (25) to clamp one end of the steel pipe from the inside and outside to fix it in the round shell (23), then start the hydraulic cylinder (27) to drive the rotating ring (29) to move laterally, use the rotating ring (29) to press the other end of the steel pipe against it and limit the other end, then start the variable speed motor (21) to make the steel pipe rotate at a constant speed; Step 2: When the steel pipe is fixed, the coating roller (12) at the bottom will be on the inner wall of the steel pipe and in contact with the inner wall of the steel pipe. Then start the electric cylinder (20) and adjust the height of the upper frame (17) so that the upper rotating tube (10) and the coating roller (12) are aligned with the outer wall of the steel pipe and in contact with the outer wall. Then start the delivery pump (4) to pump the anti-corrosion coating in the storage tank (2) into the delivery pipeline until the coating reaches the position of the rotating tube (10). Step 3: The coating seeps out from the liquid outlet (11) of the rotating tube (10) to the coating roller (12). Start the stepper motor (18), and drive the U-shaped tube (9) to move smoothly along the cross groove through the meshing of the gear (19) and the rack rod (13), so as to drive the coating roller (12) to evenly apply the anti-corrosion coating on the inner and outer surfaces of the rotating steel tube. Step 4: Start the hot air blower (30). The hot air is blown onto the coated steel pipe surface through the air supply pipe (31), corrugated corner pipe (32) and T-shaped air outlet pipe (34). After the steel pipe is coated, blow air onto the coated surface of the steel pipe in time to accelerate the surface drying and curing of the coating and form a complete corrosion-resistant protective layer. Step 5: After processing is complete, stop all power units, release the clamping assembly, remove the steel pipe, return the coating assembly to its initial position, clean the equipment, and the operation is complete.

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