A building duct painting device

Abstract

The utility model discloses a kind of building pipeline paint brushing device, including workbench, multiple lower wheel frame and at least one conveying mechanism, workbench side is equipped with support plate, support plate side is equipped with side plate, and spray gun is installed on side plate;Lower wheel frame includes base, and the both sides of base are equipped with driving wheel, and driving wheel's wheel shaft is fixedly installed with driven pulley, and base is rotatably connected with main shaft, and main shaft is equipped with driving pulley;Multiple conveying mechanism is arranged at intervals with multiple lower wheel frame, and conveying mechanism and lower wheel frame jointly act, make pipeline spiral advance, including two symmetrically arranged mounting bracket, and several conveying rollers are rotatably connected on mounting bracket.The utility model's lower wheel frame and conveying mechanism jointly act and drive pipeline spiral advance, when pipeline spiral advances, spray gun is evenly sprayed paint to pipeline outer wall, so that the paint spraying length of pipeline is not influenced by workbench length, and the flexibility and adaptability of paint brushing device are enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of painting equipment, and specifically relates to a painting device for building pipes. Background Technology

[0002] In the field of construction engineering, pipeline systems, as core infrastructure, require fixed color markings based on the different media being transported. This requirement is clearly specified in the "Basic Identification Colors, Identification Symbols and Safety Markings for Industrial Pipelines" (GB 7231): for example, fire-fighting pipelines must be red, gas pipelines must be yellow, heating water supply pipes must be red, and heating return pipes must be blue. Such color markings not only ensure the safe operation of pipeline systems but also significantly improve the efficiency of identification during later maintenance and repairs, preventing safety accidents or maintenance delays caused by media confusion.

[0003] Traditional pipe painting in construction has long relied on manual operation, which has many significant drawbacks: on the one hand, manual painting requires workers to use hand brushes or rollers to paint section by section, resulting in extremely low work efficiency and making it difficult to meet the time requirements of large-scale construction projects; on the other hand, the volatile organic compounds (VOCs) contained in paint can directly harm the respiratory system and skin of workers.

[0004] To address the drawbacks of manual painting, CN221433629U discloses a pipe exterior rust removal and painting device. This device uses a base plate with two sets of fixed frames. A positioning mechanism inside the fixed frames limits and fixes the pipe, while a first motor on the base plate drives the fixed plate of the positioning mechanism to rotate, keeping the pipe in a continuous rotational state. Furthermore, the device is equipped with a transmission assembly consisting of a second motor, a screw, and a sleeve. The second motor drives the screw to rotate, causing the sleeve to move the painting mechanism horizontally, thus achieving integrated rust removal and painting of the pipe exterior. Compared to traditional manual painting, this device effectively improves painting efficiency and reduces the safety risks of manual operation.

[0005] However, in actual building pipeline construction scenarios, this device still has significant technical limitations: the horizontal movement range of its painting mechanism depends entirely on the stroke of the screw sleeve on the screw rod. When dealing with long-distance pipelines commonly found in building engineering (such as heating main pipes and fire-fighting main pipes whose length exceeds the screw rod's stroke), the pipeline needs to be painted in sections. After each section is painted, the machine needs to be stopped, the pipeline disassembled, the device position adjusted, and repositioned. This not only increases the complexity of the operation steps, but more importantly, to avoid the paint from sticking and dripping onto the undried paint surface of the previous section, resulting in paint damage or color mixing, the operators must wait for the previous section to be completely dry before starting the next section. This waiting process significantly prolongs the overall construction cycle, making it difficult to meet the high requirements for construction efficiency in building engineering. At the same time, segmented painting may also cause obvious paint joint marks on the pipeline surface, affecting the continuity and aesthetics of the markings, and may even lead to irregular color boundaries due to multiple positioning deviations. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a building pipe painting device to solve the problem that the existing pipe painting devices cannot meet the needs of painting long pipes.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A painting device for building pipes, comprising: A workbench with a support plate on one side and a side plate on the other side, on which a spray gun is mounted; Multiple lower wheel frames are used to support and rotate the pipes. Each lower wheel frame includes a base, with drive wheels on both sides of the base. Driven pulleys are fixedly mounted on the axles of the drive wheels. A main shaft is rotatably connected to the base. Multiple lower wheel frames share a single main shaft. A drive pulley is mounted on the main shaft. The drive pulley and the driven pulley are connected by a transmission belt. Both the drive pulley and the driven pulley are located inside a transmission box. A reducer and a first motor are located on one side of one of the bases. The output shaft of the reducer is connected to the main shaft. At least one conveying mechanism is used to drive the pipeline forward. Multiple conveying mechanisms and multiple lower wheel frames are arranged at intervals. The conveying mechanisms and lower wheel frames work together to make the pipeline spiral forward. It includes two symmetrically arranged mounting frames. Several conveying rollers are rotatably connected to the mounting frames. The conveying rollers abut against the outer wall of the pipeline. The lower end of the roller shaft of the conveying roller is fixedly connected to a fourth bevel gear. Several transmission shafts are rotatably connected to the worktable through a bracket. One end of the transmission shaft is fixedly connected to a second bevel gear that meshes with the first bevel gear. A third bevel gear that meshes with the fourth bevel gear is also fixedly connected to the transmission shaft. The third bevel gear is rotatably connected to the mounting frame.

[0008] Furthermore, an air duct is also installed on the side plate, with one end of the air duct connected to a compressed air fan for drying the pipe after painting.

[0009] Furthermore, both the driving pulley and the driven pulley are synchronous pulleys, and the transmission belt is a synchronous belt.

[0010] Furthermore, it also includes an adjustment mechanism for adjusting the spacing between the conveying rollers on both sides of the conveying mechanism to accommodate pipes of different diameters. The drive shaft is a splined shaft, and the third bevel gear has a spline groove that is clearance-fitted with the drive shaft. The adjustment mechanism includes two mounting seats fixedly installed on the workbench. The middle of the two mounting seats is connected by a fixed plate. The mounting seats are provided with guide rails, and each end of the guide rail is slidably connected to a slide block. The lower end of the mounting frame is fixedly installed on the slide block. A swing arm is rotatably connected to the fixed plate. Each end of the swing arm is pivotally connected to a connecting rod, and the other end of the connecting rod is connected to the middle of the slide block. A telescopic cylinder is provided at the lower part of the fixed plate, and the piston rod end of the telescopic cylinder is connected to the bottom of one of the slide blocks.

[0011] Furthermore, the upper end of the support plate is provided with a top plate, and the top plate is provided with a clamping mechanism for clamping the upper part of the pipe. The clamping mechanism includes a clamping cylinder installed on the top plate. The piston rod of the clamping cylinder passes through the top plate and is connected to an upper wheel frame. Both ends of the upper wheel frame are rotatably connected to driven wheels. The driven wheels and the drive wheels together clamp the pipe to limit the radial runout of the pipe.

[0012] Furthermore, guide rods are fixedly connected to both ends of the upper wheel frame, and a connecting plate is fixedly connected to the lower end of the piston rod of the pressing cylinder. The upper end of the guide rod passes through the connecting plate, and a spring is sleeved on the outside of the guide rod. The upper end of the spring is connected to the connecting plate, and the lower end of the spring is connected to the upper wheel frame.

[0013] Furthermore, the upper wheel frame is arranged at an angle, and the angle of the upper wheel frame is consistent with the forward direction of the pipeline.

[0014] Furthermore, a rust removal mechanism is provided on one side of the workbench for rust removal before pipe painting. The rust removal mechanism includes two symmetrically arranged brushes. One end of the brush is rotatably connected to the base of the lower wheel frame on the side, and a driven gear is fixedly connected to one end of the brush. A driving gear is fixedly connected to one end of the main shaft, and both driven gears mesh with the driving gear.

[0015] Furthermore, a collection box is provided at the lower part of the brush, and the collection box is installed on one side of the workbench for collecting rust and impurities brushed off.

[0016] Furthermore, it also includes a mobile vehicle for supporting the end of the pipe. The mobile vehicle includes a scissor lift, which can be either unpowered or powered. The scissor lift has a support seat on its upper part, a second motor on one side of the support seat, and a pipe support mechanism on the other side of the support seat. The pipe support mechanism includes a central wheel, which is connected to the output shaft of the second motor. At least three planetary gears are meshed on the outer side of the central wheel and are evenly distributed along the circumference of the central wheel. The planetary gears are rotatably connected to the support seat. Each planetary gear has a support arm, and one end of the support arm is rotatably connected to a roller. Multiple rollers jointly support the inner wall of the pipe. An end cap is also provided on one side of the pipe support mechanism.

[0017] The beneficial effects of this utility model are: (1) The lower wheel frame and the conveying mechanism of this utility model work together to drive the pipe spiral forward. When the pipe spirals forward, the spray gun sprays paint evenly on the outer wall of the pipe, so that the paint spraying length of the pipe is not affected by the length of the workbench, thus enhancing the flexibility and adaptability of the painting device.

[0018] (2) Air ducts were installed on the side panel to quickly dry the painted pipes, which improved the drying efficiency of the pipes after painting.

[0019] (3) Adjust the distance between the conveying rollers on both sides of the conveying mechanism using the adjustment mechanism. This is suitable for painting pipes of different diameters.

[0020] (4) By setting up a clamping mechanism, the driven wheel and the driving wheel clamp the pipe together, which restricts the radial runout of the pipe. In addition, the upper wheel frame is placed at an angle. When the inclined driven wheel rotates, it exerts a horizontal thrust on the pipe, which in turn drives the pipe to move in a spiral motion, thus enhancing the effect of the pipe's spiral motion.

[0021] (5) By setting up a rust removal mechanism, rust removal and impurity removal operations are carried out on the pipeline before painting, ensuring the quality of pipeline painting.

[0022] (6) By setting up a moving vehicle at the end of the pipe to support the pipe, bending and deformation of the long pipe is avoided when it spirals forward. Attached Figure Description

[0023] Figure 1 This is a diagram showing the usage status of a painting device for building pipes according to this utility model.

[0024] Figure 2 This is an assembly diagram of the lower wheel frame, conveying mechanism, clamping mechanism, and rust removal mechanism.

[0025] Figure 3 This is a schematic diagram of the lower wheel frame structure.

[0026] Figure 4 This is a schematic diagram of the interior of the lower wheel frame.

[0027] Figure 5 This is a schematic diagram of the conveying mechanism.

[0028] Figure 6 This is a schematic diagram of the adjustment mechanism.

[0029] Figure 7 This is a schematic diagram of the rust removal mechanism.

[0030] Figure 8 This is a schematic diagram of the clamping mechanism.

[0031] Figure 9 This is a schematic diagram of the mobile vehicle structure.

[0032] Figure 10 This is a schematic diagram of the tube support mechanism.

[0033] In the picture: 1. Workbench; 11. Support plate; 12. Top plate; 13. Side plate; 14. Spray gun; 15. Air duct; 2. Lower wheel frame; 21. Base; 22. Drive wheel; 23. Main shaft; 24. Transmission box; 25. Reducer; 26. First motor; 27. Drive pulley; 28. Driven pulley; 3. Conveying mechanism; 31. Mounting frame; 32. Conveying roller; 33. First bevel gear; 34. Drive shaft; 35. Second bevel gear; 36. Third bevel gear; 37. Fourth bevel gear; 4. Adjustment mechanism; 41. Mounting base; 42. Guide rail; 43. Slide block; 44. Fixing plate; 45. Swing arm; 46. Telescopic cylinder; 47. Connecting rod; 5. Clamping mechanism; 51. Clamping cylinder; 52. Connecting plate; 53. Guide rod; 54. Upper wheel frame; 55. Driven wheel; 56. Spring; 6. Rust removal mechanism; 61. Drive gear; 62. Driven gear; 63. Brush; 64. Collection box; 7. Mobile vehicle; 71. Scissor lift vehicle; 72. Support seat; 73. Second motor; 74. Center wheel; 75. Planetary gears; 76. Support arm; 77. Roller; 78. End cover. Detailed Implementation

[0034] The following will be combined with the appendix Figures 1-10 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] like Figure 1 , Figure 2 As shown, a building pipe painting device includes a workbench 1, multiple lower wheel frames 2 and at least one conveying mechanism 3. A support plate 11 is provided on one side of the workbench 1, and a side plate 13 is provided on one side of the support plate 11. A spray gun 14 is installed on the side plate 13 for spraying paint on the pipe. The lower wheel frame 2 is used to support the pipe and drive the pipe to rotate, such as Figure 3 , Figure 4 As shown, the lower wheel frame 2 includes a base 21, with drive wheels 22 on both sides of the base 21. A driven pulley 28 is fixedly mounted on the axle of the drive wheel 22. A main shaft 23 is rotatably connected to the base 21, and multiple lower wheel frames 2 share a main shaft 23. A drive pulley 27 is provided on the main shaft 23. The drive pulley 27 and the driven pulley 28 are connected by a transmission belt. Both the drive pulley 27 and the driven pulley 28 are located inside the transmission box 24. A reducer 25 and a first motor 26 are provided on one side of one of the bases 21. The output shaft of the reducer 25 is connected to the main shaft 23. The first motor 26 drives the main shaft 23 to rotate through the reducer 25. The driving pulley 27 drives the driven pulley 28 and the drive wheel 22 to rotate in the same direction through the transmission belt, thereby driving the pipe placed on the drive wheel 22 to rotate.

[0037] The conveying mechanism 3 is used to drive the pipeline forward. Multiple conveying mechanisms 3 and multiple lower wheel frames 2 are arranged at intervals. The conveying mechanisms 3 and the lower wheel frames 2 work together to make the pipeline spiral forward, such as... Figure 5 As shown, the conveying mechanism 3 includes two symmetrically arranged mounting frames 31. Several conveying rollers 32 are rotatably connected to the mounting frames 31. The conveying rollers 32 abut against the outer wall of the pipe. A fourth bevel gear 37 is fixedly connected to the lower end of the roller shaft of the conveying roller 32. Several transmission shafts 34 are rotatably connected to the worktable 1 through a bracket (not shown in the figure). A second bevel gear 35 that meshes with the first bevel gear 33 is fixedly connected to one end of the transmission shaft 34. A third bevel gear 36 that meshes with the fourth bevel gear 37 is also fixedly connected to the transmission shaft 34. The third bevel gear 36 is rotatably connected to the mounting frame 31. The second bevel gears 35 on both sides of the first bevel gear 33 rotate in opposite directions, driving the transmission shafts 34 on both sides to rotate in opposite directions. This, in turn, is transmitted through the third bevel gear 36 and the fourth bevel gear 37, causing the conveying rollers 32 on both sides to rotate in opposite directions, thus realizing the forward conveying of the pipeline.

[0038] like Figure 8 As shown, an air duct 15 is also installed on the side plate 13. One end of the air duct 15 is connected to a compressed air fan for drying the pipe after painting, thereby improving the drying efficiency of the pipe after painting.

[0039] like Figure 4 As shown, both the driving pulley 27 and the driven pulley 28 are synchronous pulleys, and the transmission belt is a synchronous belt, which ensures the stability of the lower wheel frame 2 in driving the rotation of the pipeline.

[0040] like Figure 5 , Figure 6 As shown, it also includes an adjustment mechanism 4, used to adjust the spacing between the conveying rollers 32 on both sides of the conveying mechanism 3 to accommodate pipes of different diameters. The drive shaft 34 is a splined shaft, and the third bevel gear 36 is provided with a spline groove that is clearance-fitted with the drive shaft 34. The adjustment mechanism 4 includes two mounting seats 41 fixedly installed on the workbench 1. The middle parts of the two mounting seats 41 are connected by a fixing plate 44. The mounting seats 41 are provided with guide rails 42. Each end of the guide rails 42 is slidably connected to a slide block 43. The lower end of the mounting frame 31 is fixedly installed on the slide block 43. A swing arm 45 is rotatably connected to the fixing plate 44. Each end of the swing arm 45 is pivotally connected to a connecting rod 47. The other end of the connecting rod 47 is connected to the middle part of the slide block 43. A telescopic cylinder 46 is provided at the lower part of the fixing plate 44. The piston rod end of the telescopic cylinder 46 is connected to the bottom of one of the slide blocks 43.

[0041] When the telescopic cylinder 46 extends or retracts, it drives the slide block 43 connected to it to move on the guide rail 42. When the slide block 43 moves, it uses the connecting rod 47 and the swing arm 45 to drive another slide block 43 to move synchronously, thereby realizing the adjustment of the distance between the two conveying rollers 32.

[0042] like Figure 8 As shown, the support plate 11 has a top plate 12 at its upper end, and a clamping mechanism 5 is provided on the top plate 12 for clamping the upper part of the pipe to prevent the pipe from jumping during transportation. The clamping mechanism 5 includes a clamping cylinder 51 installed on the top plate 12. The piston rod of the clamping cylinder 51 passes through the top plate 12 and is connected to an upper wheel frame 54. Both ends of the upper wheel frame 54 are rotatably connected to driven wheels 55. The driven wheels 55 and the drive wheel 22 together clamp the pipe to limit the radial jump of the pipe.

[0043] like Figure 8As shown, guide rods 53 are fixedly connected to both ends of the upper wheel frame 54, and a connecting plate 52 is fixedly connected to the lower end of the piston rod of the pressing cylinder 51. The upper end of the guide rod 53 passes through the connecting plate 52, and a spring 56 is sleeved on the outside of the guide rod 53. The upper end of the spring 56 is connected to the connecting plate 52, and the lower end of the spring 56 is connected to the upper wheel frame 54. The spring 56 is used to compensate for the stroke error of the pressing cylinder 51 and avoid excessive displacement of the driven wheel 55 during descent, which could cause pipe deformation.

[0044] like Figure 8 As shown, the upper wheel frame 54 is arranged at an angle, and the angle of the upper wheel frame 54 is consistent with the forward direction of the pipeline. The friction between the driven wheel 55 and the pipeline drives the driven wheel 55 to rotate. When the inclined driven wheel 55 rotates, it also has a horizontal thrust, which in turn drives the pipeline to move in a spiral motion, thus enhancing the effect of the pipeline spiral motion.

[0045] like Figure 7 As shown, a rust removal mechanism 6 is provided on one side of the workbench 1 for rust removal before pipe painting. The rust removal mechanism 6 includes two symmetrically arranged brushes 63. One end of the brushes 63 is rotatably connected to the base 21 of the lower wheel frame 2 on the side, and a driven gear 62 is fixedly connected to one end of the brushes 63. A driving gear 61 is fixedly connected to one end of the main shaft 23, and both driven gears 62 mesh with the driving gear 61. When the main shaft 23 rotates, the brushes 63 on both sides are driven to rotate in opposite directions by the gear transmission to brush and remove rust from the pipe, thus ensuring the quality of the steel pipe painting.

[0046] like Figure 7 As shown, the brush 63 is provided with a collection box 64 at its lower part. The collection box 64 is installed on one side of the workbench 1 and is used to collect rust and impurities from the brush.

[0047] like Figure 9 , Figure 10 As shown, it also includes a mobile vehicle 7 for supporting the end of the pipe. The mobile vehicle 7 includes a scissor lift 71, which can be a non-powered or powered scissor lift 71. The upper part of the scissor lift 71 is provided with a support seat 72. A second motor 73 is provided on one side of the support seat 72. A pipe support mechanism is provided on the other side of the support seat 72. The pipe support mechanism includes a central wheel 74, which is connected to the output shaft of the second motor 73. At least three planetary gears 75 are evenly distributed along the circumference of the central wheel 74 and meshed on the outer side of the central wheel 74. The planetary gears 75 are rotatably connected to the support seat 72. Each planetary gear 75 is provided with a support arm 76. One end of the support arm 76 is rotatably connected to a roller 77. Multiple rollers 77 jointly support the inner wall of the pipe. An end cap 78 is also provided on one side of the pipe support mechanism.

[0048] During pipe painting, roller 77 is supported on the inner wall of one end of the pipe, and moving carriage 7 moves the pipe forward with the pipe and supports the end of the pipe, thus avoiding bending and deformation when painting long pipes.

[0049] In this embodiment, the second motor 73 is a servo motor. When the inner diameter of the pipe to be painted changes, the second motor 73 drives the center wheel 74 to rotate, and the center wheel 74 drives multiple planetary gears 75 to rotate. In turn, the position of the roller 77 is changed through the support arm 76 to adapt to the change in the inner diameter of the pipe.

[0050] During pipe painting, one end of the pipe is suspended on the lower wheel frame 2, the clamping cylinder 51 extends, and the driven wheel 55 and the drive wheel 22 clamp the pipe together. The first motor 26 is started, and the first motor 26 drives the lower wheel frame 2 to rotate through the main shaft 23, thereby driving the pipe to rotate. At the same time, the main shaft 23 drives the conveying roller 32 of the conveying mechanism 3 to rotate, driving the pipe to move forward. The lower wheel frame 2 and the conveying mechanism 3 work together to drive the pipe to move forward in a spiral. At the same time, the inclined upper wheel frame 54 also has a horizontal component force on the pipe, which further enhances the effect of the pipe moving forward in a spiral.

[0051] The main shaft 23 drives the brush 63 of the rust removal mechanism 6 to rotate, cleaning the outer wall of the pipe and ensuring the effect and quality of the pipe painting.

[0052] A movable vehicle 7 can be installed at the front end or both ends of the pipe to support the ends of the pipe and prevent deformation when the pipe spirals forward.

[0053] The above content is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the utility model, they should all fall within the protection scope of this utility model.

Claims

1. A device for painting building pipes, comprising: A workbench with a support plate on one side and a side plate on the other side, on which a spray gun is mounted; The feature is that it further includes multiple lower wheel frames for supporting the pipe and driving the pipe to rotate. Each lower wheel frame includes a base, with drive wheels on both sides of the base. A driven pulley is fixedly installed on the axle of the drive wheel. A main shaft is rotatably connected to the base. Multiple lower wheel frames share a main shaft. A drive pulley is provided on the main shaft. The drive pulley and the driven pulley are connected by a transmission belt. Both the drive pulley and the driven pulley are located inside a transmission box. A reducer and a first motor are provided on one side of one of the bases. The output shaft of the reducer is connected to the main shaft. At least one conveying mechanism is used to drive the pipeline forward. Multiple conveying mechanisms and multiple lower wheel frames are arranged at intervals. The conveying mechanisms and lower wheel frames work together to make the pipeline spiral forward. It includes two symmetrically arranged mounting frames. Several conveying rollers are rotatably connected to the mounting frames. The conveying rollers abut against the outer wall of the pipeline. The lower end of the roller shaft of the conveying roller is fixedly connected to a fourth bevel gear. Several transmission shafts are rotatably connected to the worktable through a bracket. One end of the transmission shaft is fixedly connected to a second bevel gear that meshes with the first bevel gear. A third bevel gear that meshes with the fourth bevel gear is also fixedly connected to the transmission shaft. The third bevel gear is rotatably connected to the mounting frame.

2. A building duct painting device according to claim 1, wherein The side panel is also equipped with an air duct, one end of which is connected to a compressed air fan for drying the pipe after painting.

3. A building duct painting device according to claim 1, wherein Both the driving pulley and the driven pulley are synchronous pulleys, and the transmission belt is a synchronous belt.

4. The building pipe painting device according to claim 1, characterized in that, It also includes an adjustment mechanism for adjusting the spacing between the conveying rollers on both sides of the conveying mechanism to accommodate pipes of different diameters. The drive shaft is a splined shaft, and the third bevel gear has a spline groove that is clearance-fitted with the drive shaft. The adjustment mechanism includes two mounting seats fixedly installed on the workbench. The middle of the two mounting seats is connected by a fixing plate. The mounting seats are provided with guide rails, and each end of the guide rail is slidably connected to a slide block. The lower end of the mounting frame is fixedly installed on the slide block. A swing arm is rotatably connected to the fixing plate. Each end of the swing arm is pivotally connected to a connecting rod, and the other end of the connecting rod is connected to the middle of the slide block. A telescopic cylinder is provided at the lower part of the fixing plate, and the piston rod end of the telescopic cylinder is connected to the bottom of one of the slide blocks.

5. A painting device for building pipes according to claim 1, characterized in that, The support plate has a top plate at its upper end, and the top plate has a clamping mechanism for clamping the upper part of the pipe. The clamping mechanism includes a clamping cylinder installed on the top plate. The piston rod of the clamping cylinder passes through the top plate and is connected to an upper wheel frame. Both ends of the upper wheel frame are rotatably connected to driven wheels. The driven wheels and the drive wheels together clamp the pipe to limit the radial runout of the pipe.

6. A painting device for building pipes according to claim 5, characterized in that, Guide rods are fixedly connected to both ends of the upper wheel frame. A connecting plate is fixedly connected to the lower end of the piston rod of the pressing cylinder. The upper end of the guide rod passes through the connecting plate. A spring is sleeved on the outside of the guide rod. The upper end of the spring is connected to the connecting plate, and the lower end of the spring is connected to the upper wheel frame.

7. A painting device for building pipes according to claim 5, characterized in that, The upper wheel frame is arranged at an angle, and the angle of the upper wheel frame is consistent with the forward direction of the pipeline.

8. A painting device for building pipes according to claim 1, characterized in that, A rust removal mechanism is provided on one side of the workbench for rust removal before pipe painting. The rust removal mechanism includes two symmetrically arranged brushes. One end of the brush is rotatably connected to the base of the lower wheel frame on the side, and a driven gear is fixedly connected to one end of the brush. A driving gear is fixedly connected to one end of the main shaft, and both driven gears mesh with the driving gear.

9. A painting device for building pipes according to claim 8, characterized in that, The brush has a collection box at its lower part, which is installed on one side of the workbench to collect rust and impurities brushed off.

10. A painting device for building pipes according to any one of claims 1-9, characterized in that, It also includes a mobile vehicle for supporting the end of the pipe. The mobile vehicle includes a scissor lift, which can be either unpowered or powered. The scissor lift has a support seat on its upper part, a second motor on one side of the support seat, and a pipe support mechanism on the other side of the support seat. The pipe support mechanism includes a central wheel, which is connected to the output shaft of the second motor. At least three planetary gears are meshed on the outer side of the central wheel and are evenly distributed along the circumference of the central wheel. The planetary gears are rotatably connected to the support seat. Each planetary gear has a support arm, and one end of the support arm is rotatably connected to a roller. The multiple rollers jointly support the inner wall of the pipe. An end cap is also provided on one side of the pipe support mechanism.

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