Spraying equipment for antiseptic treatment of interior of adsorption tower of pressure swing adsorption nitrogen making machine

Abstract

Spraying equipment for anticorrosion treatment of the interior of an adsorption tower of a pressure swing adsorption nitrogen making machine relates to the technical field of surface spraying and comprises a spraying workbench, and a conveying and feeding assembly, a clamping and transferring assembly, a pretreatment assembly, a double spraying assembly and a drying and curing assembly are arranged on the spraying workbench. The pretreatment assembly, the double spraying assembly and the drying and curing assembly are arranged on the same annular track. The problems that when spraying equipment in the traditional technology is used for spraying the interior of an adsorption tower, the efficiency of the feeding and discharging process is low, manual work is relied on, workpiece transferring and positioning precision is insufficient, the pretreatment effect is poor, consequently, coating adhesive force is insufficient, the spraying technology efficiency and uniformity are insufficient, curing time is long, and procedure connection is not coherent are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of surface spraying, and particularly to a spraying device for internal anti-corrosion treatment of an adsorption tower of a pressure swing adsorption nitrogen generator. Background Art

[0002] A pressure swing adsorption nitrogen generator is a device that separates nitrogen from air through the principle of physical adsorption and is widely used in industries such as chemical engineering, electronics, food, and medicine.

[0003] The adsorption tower is the core component of a PSA nitrogen generator, directly affecting nitrogen purity, output, and equipment life. Its function is to separate oxygen and nitrogen through the selective adsorption of carbon molecular sieve (CMS).

[0004] In a pressure swing adsorption (PSA) nitrogen generator, the anti-corrosion treatment of the adsorption tower directly affects equipment life and gas purity. Since compressed air may contain moisture, trace amounts of oil, and acidic gases (such as CO 2 、H 2 S), long-term operation easily leads to corrosion of the inner wall of the tower body, which in turn contaminates the molecular sieve or causes leakage. Therefore, internal anti-corrosion spraying is a key process in the manufacturing and maintenance of adsorption towers.

[0005] However, when using existing spraying equipment for internal spraying of adsorption towers, the following problems generally exist: 1. In traditional painting processes, the loading (before spraying) and unloading (after spraying) of the adsorption tower shell may rely on step-by-step operations or manual handling, resulting in interruptions in the production process, low efficiency, and difficulty in achieving fully automated management.

[0006] 2. When the adsorption tower shell is transferred between multiple workstations (grinding, spraying, drying, etc.), it needs to be repeatedly clamped or adjusted, which is time-consuming and prone to positioning errors; during the spraying process, the workpiece remains stationary, resulting in coating dead spots (such as uneven coverage of the inner wall or complex curved surfaces).

[0007] 3. Foundry defects on the inner wall of the adsorption tower are not effectively treated, or the roughness is insufficient, resulting in easy peeling of the coating under high-temperature and high-pressure environments; the pretreatment waste chips are not thoroughly cleaned, affecting the subsequent spraying quality.

[0008] 4. Traditional spray guns have limited fixing or adjustment ranges, resulting in uneven spraying coverage, especially difficult to control the thickness in arc-shaped areas; the paint ratio is prone to sticking and curing during the process, affecting the continuity of spraying.

[0009] 5. Natural curing takes a long time, prolonging the production cycle; each workstation (pretreatment, spraying, drying) is dispersed and independent, resulting in process interruptions and efficiency losses.

[0010] In summary, it is obvious that the existing technology has inconveniences and defects in actual use, so it is necessary to improve. Summary of the Invention

[0011] Aiming at the defects in the prior art, the present invention provides a spraying device for internal anti-corrosion treatment of the adsorption tower of a pressure swing adsorption nitrogen generator, so as to solve the problems existing in the traditional spraying device when used for internal spraying of the adsorption tower, such as low efficiency of the loading and unloading process and dependence on manual labor, insufficient accuracy of workpiece transfer and positioning, poor pretreatment effect resulting in insufficient coating adhesion, insufficient efficiency and uniformity of the spraying process, long curing time and discontinuous process connection, etc.

[0012] To achieve the above object, the present invention provides the following technical solutions: A spraying device for internal anti-corrosion treatment of the adsorption tower of a pressure swing adsorption nitrogen generator, including a spraying workbench, on which a conveying and loading component, a clamping and transferring component, a pretreatment component, a double spraying component and a drying and curing component are respectively arranged, and the pretreatment component, the double spraying component and the drying and curing component are arranged on the same annular track.

[0013] As an optimized scheme, the clamping and transferring component includes a support base, on which a clamping side plate is rotatably arranged, a circular rotating plate is rotatably arranged on the side surface of the clamping side plate, a turning limit frame is fixedly connected to the lower side of the horizontal outer end surface of the circular rotating plate, a turning seat is arranged in the turning limit frame, an intermediate turntable is rotatably installed in the middle of the lower surface of the turning seat, a clamping and positioning block is telescopically arranged on the intermediate turntable, and arc-shaped clamping plates are telescopically arranged on each side end surface of the clamping and positioning block.

[0014] As an optimized scheme, a sliding base is arranged on one side of the upper surface of the spraying workbench, a support vertical plate is fixedly connected to the middle of the upper surface of the sliding base, the pretreatment component includes a connecting half cylinder fixedly connected to the horizontal end surface of the support vertical plate, a horizontal pretreatment mesh cylinder is externally connected to the connecting half cylinder, coarse abrasive is arranged in the pretreatment mesh cylinder, the particle size of the coarse abrasive is larger than the aperture of the pretreatment mesh cylinder, and several centrally symmetric turning blades are also arranged in the pretreatment mesh cylinder.

[0015] As an optimized scheme, the double spraying component includes a first spraying seat and a second spraying seat arranged symmetrically, horizontal first and second telescopic cylinders are respectively fixedly connected to the support vertical plate, the telescopic end of the first telescopic cylinder is fixedly connected to the first spraying seat, the telescopic end of the second telescopic cylinder is fixedly connected to the second spraying seat, a primer spray gun is rotatably arranged at the end of the first spraying seat, and a topcoat spray gun is rotatably arranged at the end of the second spraying seat.

[0016] As an optimized solution, the drying and curing assembly is arranged directly above the pretreatment assembly. The drying and curing assembly includes an inner air box and an outer air box. Both the inner air box and the outer air box are fixedly connected to the supporting vertical plate and are respectively arranged on the inner and outer sides thereof. A connecting pipe is arranged between the inner air box and the outer air box.

[0017] As an optimized solution, a fan driving motor is fixedly connected to the lateral outer wall of the outer air box. The end of the output shaft of the fan driving motor extends into the outer air box and is fixedly connected with a fan impeller.

[0018] As an optimized solution, a ring-shaped electric heating tube is fixedly arranged in the inner air box. Two symmetrically arranged power supply modules are fixedly connected to the outer peripheral wall of the inner air box. The power supply modules are connected to the ring-shaped electric heating tube for power supply.

[0019] As an optimized solution, a horizontal drying cylinder is fixedly connected to the lateral end face of the inner air box. A plurality of air flow nozzles are fixedly connected to the drying cylinder along the circumferential and axial directions.

[0020] As an optimized solution, the inner air box is externally connected with four intake elbow pipes, and the end of each intake elbow pipe is respectively fixedly connected and communicated to the drying cylinder.

[0021] As an optimized solution, a longitudinally extending conveying clamping plate is fixedly connected to one side of the upper surface of the spraying workbench. The conveying clamping plate is arranged in parallel with the supporting base. The conveying and feeding assembly includes two symmetrically arranged conveying rollers. The two conveying rollers are rotatably installed between the conveying clamping plate and the supporting base, and a conveyor belt is sleeved between the two conveying rollers.

[0022] As an optimized solution, a transmission box is fixedly connected to the lateral outer wall of the conveying clamping plate. A conveying driving motor is fixedly connected to the longitudinal side wall of the transmission box. Two meshing bevel gears are arranged in the transmission box. One of the bevel gears is fixedly connected to the side end face of one of the conveying rollers through a horizontal coupling shaft, and the other bevel gear is fixedly connected to the output shaft of the conveying driving motor.

[0023] As an optimized solution, the supporting base is a longitudinally extending U-shaped seat with an opening facing downward. The lower end of the supporting base is fixedly connected to the upper surface of the spraying workbench. A vertical connecting rotating shaft is fixedly connected to the middle of the lower surface of the clamping side plate. The end of the connecting rotating shaft passes through the supporting base downward and is fixedly connected with a central driving wheel.

[0024] As an optimized solution, a transmission driving motor is fixedly connected to one side of the upper surface of the supporting base. The end of the output shaft of the transmission driving motor passes through the supporting base downward and is fixedly connected with a side driving wheel. A transmission belt is sleeved between the side driving wheel and the central driving wheel.

[0025] As an optimized solution, rotation avoidance openings are respectively formed on each longitudinal side end face of the clamping side plate, and the rotation avoidance openings can avoid the transmission drive motor during the rotation of the clamping side plate.

[0026] As an optimized solution, a rotation mounting opening is formed on one transverse end face of the clamping side plate, the circular rotating plate is rotatably arranged in the rotation mounting opening, a steering drive motor is fixedly connected to the other transverse end face of the clamping side plate, and the end of the output shaft of the steering drive motor passes through the clamping side plate and is fixedly connected to the back surface of the circular rotating plate.

[0027] As an optimized solution, the flipping limit frame is a horizontally arranged U-shaped frame with a transverse opening, and flipping drive motors are respectively fixedly connected to each longitudinal outer wall of the flipping limit frame. The end of the output shaft of the flipping drive motor passes through the flipping limit frame and is fixedly connected to the side end face of the flipping seat.

[0028] As an optimized solution, a rotation drive motor is fixedly connected to the middle of the upper surface of the flipping seat. The end of the output shaft of the rotation drive motor passes downward through the flipping seat and is fixedly connected to the middle turntable. A hydraulic telescopic cylinder is fixedly connected to the center of the lower surface of the middle turntable. The lower telescopic end of the hydraulic telescopic cylinder is fixedly connected to the upper surface of the clamping positioning block. The clamping positioning block is a horizontally arranged square block, and clamping telescopic cylinders are respectively fixedly connected to each side end face of the clamping positioning block. The telescopic end of the clamping telescopic cylinder is fixedly connected to the corresponding arc-shaped clamping plate.

[0029] As an optimized solution, a horizontally extending sliding limit groove is formed on the upper surface of the spraying workbench, a limit sliding block is fixedly connected to the lower surface of the sliding base, and the limit sliding block is slidably clamped in the sliding limit groove.

[0030] As an optimized solution, two symmetrically arranged sliding drive motors are also fixedly connected to the upper surface of the spraying workbench. The end of the output shaft of each sliding drive motor is fixedly connected with a horizontally extending drive threaded rod. Each drive threaded rod respectively passes through and is threadedly connected to the sliding base, and the end of the drive threaded rod is rotatably supported on the transverse outer wall of the support base.

[0031] As an optimized solution, the inner diameter dimensions of the pretreatment mesh cylinder and the connecting half cylinder are the same, and the outer diameter dimensions of the pretreatment mesh cylinder are slightly smaller than the inner ring dimensions of the adsorption tower shell to be sprayed.

[0032] As an optimized solution, an electric control box is fixedly connected to the lateral end face on the other side of the supporting vertical plate. The electric control box is externally connected to a control module, and the control module is arranged inside the connecting half-cylinder. Four centrally symmetric electric control telescopic cylinders are arranged outside the control module, and the telescopic ends of the electric control telescopic cylinders are fixedly connected to the supporting vertical plate. The four electric control telescopic cylinders are fixedly connected to the control module through electric control pipelines.

[0033] As an optimized solution, transverse push circular plates are fixedly connected to the telescopic ends of the four electric control telescopic cylinders, and the transverse push circular plates are arranged closely against the inner peripheral wall of the connecting half-cylinder.

[0034] As an optimized solution, a turning material driving motor is fixedly connected to the center of the back surface of the transverse push circular plate. The end of the output shaft of the turning material driving motor passes through the transverse push circular plate and is fixedly connected to a turning material transverse shaft. A number of turning material paddle blades are fixedly connected to the turning material transverse shaft in a centrally symmetric manner, and the turning material paddle blades are arranged closely against the inner peripheral wall of the pretreatment mesh cylinder.

[0035] As an optimized solution, a first fixing plate is fixedly connected to the lateral end face of the first spraying seat. A first steering wheel is arranged on the first fixing plate. A first swinging seat is fixedly connected to the side end face of the first steering wheel, and the primer spray gun is fixedly connected to the lower end of the first swinging seat.

[0036] As an optimized solution, a first driving motor is fixedly connected to the back surface of the first fixing plate. The end of the output shaft of the first driving motor passes through the first fixing plate and is fixedly connected to a first driving wheel, and the first driving wheel is in contact transmission with the first steering wheel.

[0037] As an optimized solution, a primer supply pump is fixedly connected to the longitudinal outer wall of the first spraying seat. A primer proportioning box is fixedly connected to the transverse end face of the supporting vertical plate corresponding to the first spraying seat, and a proportioning and stirring mechanism is arranged inside the primer proportioning box.

[0038] As an optimized solution, the primer proportioning box is externally connected to a first spiral pipe. The first spiral pipe passes through the supporting vertical plate and is fixedly connected and communicated to the primer supply pump. The primer supply pump is externally connected to a primer supply pipe. The primer supply pipe sequentially passes through the first fixing plate, the first steering wheel, and the first swinging seat, and is fixedly connected and communicated to the primer spray gun.

[0039] As an optimized solution, the proportioning and stirring mechanism includes a stirring driving motor. The stirring driving motor is fixedly connected to the center of the lower surface of the primer proportioning box. The end of the output shaft of the stirring driving motor passes through the primer proportioning box upward and is fixedly connected to a stirring vertical shaft, and a number of stirring paddle blades are fixedly connected to the stirring vertical shaft.

[0040] As an optimized solution, a second fixed plate is fixedly connected to the lateral side end face of the second spraying seat. A second steering wheel is provided on the second fixed plate. A second swinging seat is fixedly connected to the side end face of the second steering wheel. The topcoat spray gun is fixedly connected to the lower end of the second swinging seat.

[0041] As an optimized solution, a second driving motor is fixedly connected to the back surface of the second fixed plate. The end of the output shaft of the second driving motor passes through the second fixed plate and is fixedly connected with a second driving wheel. The second driving wheel is in contact transmission with the second steering wheel.

[0042] As an optimized solution, a topcoat supply pump is fixedly connected to the longitudinal outer wall of the second spraying seat. A topcoat proportioning tank corresponding to the second spraying seat is fixedly connected to the lateral end face of the supporting vertical plate. The same proportioning and stirring mechanism as described above is also provided in the topcoat proportioning tank.

[0043] As an optimized solution, a second spiral tube is externally connected to the topcoat proportioning tank. The second spiral tube passes through the supporting vertical plate and is fixedly connected and communicated to the topcoat supply pump. The topcoat supply pump is externally connected to a topcoat supply pipe. The topcoat supply pipe sequentially passes through the second fixed plate, the second steering wheel, the second swinging seat, and is fixedly connected and communicated to the topcoat spray gun.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows: The feeding and conveying assembly provided in the present invention adopts an integrated design, which can synchronously complete the feeding before spraying and the discharging and conveying after spraying, and realize the full-automatic management of the circulation of the adsorption tower shell.

[0045] The clamping and transferring assembly provided in the present invention realizes the accurate and rapid transfer of the adsorption tower shell among the workstations of grinding pretreatment, primer spraying, drying and curing, and topcoat spraying through a multi-degree-of-freedom adjustment system (including actions such as the rotation of the clamping side plate, the steering of the circular turntable, and the flipping of the flipping seat), greatly shortening the clamping time; further, the clamping and transferring assembly adopts a four-arc clamping plate linkage clamping structure, and cooperates with the rotating driving motor to continuously rotate the workpiece during spraying / drying, effectively eliminating the treatment dead angle.

[0046] In the present invention, the pre-treatment component is provided to perform rotational friction pre-treatment on the inner peripheral wall of the adsorption tower housing before primer spraying, so as to increase the roughness of the inner wall of the adsorption tower and eliminate casting defects, thereby increasing the adhesion of the coating and avoiding the problem of coating peeling off under high temperature and high pressure environment; specifically, the pre-treatment component mainly drives the coarse abrasive in the pre-treatment cylinder to rotate circumferentially through the pusher blade, so that the part of the coarse abrasive passing through the mesh holes of the pre-treatment cylinder is in frictional contact with the inner wall of the adsorption tower, thereby realizing grinding pre-treatment; further, driven by the clamping and transfer component, the adsorption tower housing after pre-treatment can be turned to the side, and then the pre-treatment waste chips are blown and cleaned by manually holding a vacuum cleaner or the like to avoid affecting the subsequent spraying process; after testing, the roughness Ra of the inner wall of the adsorption tower after pre-treatment is ≥ 3.2 μm, the adhesion of the primer reaches Grade 1 of the GB / T 9286-1998 standard, and the thickness deviation of the topcoat is ≤ ± 5 μm The dual spraying component provided in the present invention includes a symmetrically arranged first spraying seat and a second spraying seat. A primer spray gun is rotatably provided on the first spraying seat, and a topcoat spray gun is rotatably provided on the second spraying seat. Both the primer spray gun and the topcoat spray gun can adjust the working angle by swinging during the spraying process, so as to expand the spraying range, and ensure the uniformity of the spraying thickness by controlling the spraying distance during the arc spraying process; further, a primer proportioning tank and a topcoat proportioning tank are respectively provided on the support vertical plate corresponding to the first spraying seat and the second spraying seat, and a proportioning stirring mechanism is provided in both the primer proportioning tank and the topcoat proportioning tank, and the proportioning stirring mechanism is driven to rotate and stir to avoid the paint from sticking and curing.

[0047] The drying and curing component provided in the present invention can perform surface drying and curing on it respectively after the primer spraying is completed and after the topcoat spraying is completed, thereby shortening the natural curing time of the paint.

[0048] The pre-treatment component, the dual spraying component and the drying and curing component in the present invention are arranged on the same annular track, so the continuous conversion of the processing stations can be carried out by driving the circular turntable to rotate. Description of the Drawings

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0050] Figure 1 It is a schematic cross-sectional view of the internal structure of each component in the present invention in the main viewing direction; Figure 2 It is a schematic cross-sectional view of the internal structure of each component in the present invention in the top viewing direction; Figure 3Schematic diagram of the spatial positions of the processing component, double spraying component and drying and curing component in the present invention in the side view direction; Figure 4 Schematic diagram of the internal structure of the clamping and transfer component in the present invention in the side view direction with a half-section; Figure 5 Schematic diagram of the overall external structure of the present invention in the front view direction; Figure 6 Schematic diagram of the overall external structure of the present invention in the top view direction; Figure 7 Schematic diagram of the overall external structure of the present invention in the left side view direction; Figure 8 is Figure 1 Partial enlarged schematic diagram of the position A in

[0051] In the figure: 1 - spraying workbench, 2 - support base, 3 - clamping side plate, 4 - connecting rotating shaft, 5 - central driving wheel, 6 - driving motor, 7 - side driving wheel, 8 - transmission belt, 9 - rotating avoidance opening, 10 - rotating mounting opening, 11 - circular rotating plate, 12 - steering driving motor, 13 - flipping limit frame, 14 - flipping seat, 15 - flipping driving motor, 16 - rotating driving motor, 17 - intermediate turntable, 18 - hydraulic telescopic cylinder, 19 - clamping positioning block, 20 - clamping telescopic cylinder, 21 - arc-shaped clamping plate, 22 - conveying clamping plate, 23 - conveying rotating roller, 24 - conveyor belt, 25 - transmission box, 26 - conveying driving motor, 27 - bevel gear, 28 - sliding limit groove, 29 - sliding base, 30 - limit sliding block, 31 - sliding driving motor, 32 - driving threaded rod, 33 - support vertical plate, 34 - connecting half cylinder, 35 - pretreatment mesh cylinder, 36 - coarse abrasive, 37 - electric control box, 38 - control module, 39 - electric control telescopic cylinder, 40 - horizontal pushing circular plate, 41 - turning material driving motor, 42 - turning material horizontal shaft, 43 - turning material paddle, 44 - inner air box, 45 - outer air box, 46 - connecting pipe, 47 - fan driving motor, 48 - fan impeller, 49 - annular electric heating tube, 50 - power supply module, 51 - drying column cylinder, 52 - air flow nozzle, 53 - intake elbow, 54 - first spraying seat, 55 - second spraying seat, 56 - first telescopic cylinder, 57 - second telescopic cylinder, 58 - primer spray gun, 59 - topcoat spray gun, 60 - first fixing plate, 61 - first steering wheel, 62 - first swinging seat, 63 - first driving motor, 64 - first driving wheel, 65 - primer supply pump, 66 - primer proportioning tank, 67 - first spiral tube, 68 - primer supply pipe, 69 - stirring driving motor, 70 - stirring vertical shaft, 71 - stirring paddle, 72 - second fixing plate, 73 - second steering wheel, 74 - second swinging seat, 75 - second driving motor, 76 - second driving wheel, 77 - topcoat supply pump, 78 - topcoat proportioning tank, 79 - second spiral tube, 80 - topcoat supply pipe. Detailed implementation manners

[0052] The embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0053] As Figures 1 to 8 shown, the spraying equipment for the internal anti-corrosion treatment of the adsorption tower of a pressure swing adsorption nitrogen generator includes a spraying workbench 1. The spraying workbench 1 is a horizontally arranged square table. A conveying and feeding component, a clamping and transferring component, a pretreatment component, a double spraying component and a drying and curing component are respectively arranged on the spraying workbench 1. The pretreatment component, the double spraying component and the drying and curing component are arranged on the same annular track.

[0054] The clamping and transferring component includes a support base 2. The support base 2 is a longitudinally extending U-shaped seat with an opening facing downwards. The lower end of the support base 2 is fixedly connected to the upper surface of the spraying workbench 1. A clamping side plate 3 is rotatably arranged in the middle of the upper surface of the support base 2. A vertical connecting rotating shaft 4 is fixedly connected to the middle of the lower surface of the clamping side plate 3. The end of the connecting rotating shaft 4 passes through the support base 2 downwards and is fixedly connected to a central driving wheel 5.

[0055] A driving motor 6 is fixedly connected to one side of the upper surface of the support base 2. The end of the output shaft of the driving motor 6 passes through the support base 2 downwards and is fixedly connected to a side driving wheel 7. A transmission belt 8 is sleeved between the side driving wheel 7 and the central driving wheel 5.

[0056] A rotating avoidance opening 9 is respectively opened on each longitudinal side end surface of the clamping side plate 3. The rotating avoidance opening 9 can avoid the driving motor 6 during the rotation of the clamping side plate 3.

[0057] A rotating installation opening 10 is opened on one lateral end surface of the clamping side plate 3. A circular rotating plate 11 is rotatably arranged in the rotating installation opening 10. A steering driving motor 12 is fixedly connected to the other lateral end surface of the clamping side plate 3. The end of the output shaft of the steering driving motor 12 passes through the clamping side plate 3 and is fixedly connected to the back surface of the circular rotating plate 11.

[0058] A turning limit frame 13 is fixedly connected to the lower side of the lateral outer end surface of the circular rotating plate 11. The turning limit frame 13 is a horizontally arranged U-shaped frame with a lateral opening.

[0059] A turning seat 14 is arranged in the turning limit frame 13. A turning driving motor 15 is fixedly connected to each longitudinal outer wall of the turning limit frame 13. The end of the output shaft of the turning driving motor 15 passes through the turning limit frame 13 and is fixedly connected to the side end surface of the turning seat 14.

[0060] The transmission drive motor 6, the steering drive motor 12, and the flipping drive motor 15 are linked through the PLC controller to achieve the spatial positioning of the adsorption tower housing in the X / Y / Z three axes.

[0061] A rotation drive motor 16 is fixedly connected to the middle of the upper surface of the flipping seat 14. The end of the output shaft of the rotation drive motor 16 passes downward through the flipping seat 14 and is fixedly connected to an intermediate turntable 17. A hydraulic telescopic cylinder 18 is fixedly connected to the center of the lower surface of the intermediate turntable 17. The lower telescopic end of the hydraulic telescopic cylinder 18 is fixedly connected to a clamping and positioning block 19. The clamping and positioning block 19 is a horizontally arranged square block. Clamping telescopic cylinders 20 are respectively fixedly connected to each lateral end surface of the clamping and positioning block 19. Arc-shaped clamping plates 21 are respectively fixedly connected to the telescopic ends of each clamping telescopic cylinder 20.

[0062] A longitudinally extending conveying clamping plate 22 is fixedly connected to one side of the upper surface of the spraying workbench 1. The conveying clamping plate 22 is arranged in parallel with the support base 2. The conveying and feeding assembly includes two symmetrically arranged conveying rollers 23. The two conveying rollers 23 are rotatably installed between the conveying clamping plate 22 and the support base 2. A conveyor belt 24 is sleeved between the two conveying rollers 23.

[0063] A transmission box 25 is fixedly connected to the transverse outer wall of the conveying clamping plate 22. A conveying drive motor 26 is fixedly connected to the longitudinal side wall of the transmission box 25. Two meshing bevel gears 27 are arranged in the transmission box 25. One of the bevel gears 27 is fixedly connected to the side end surface of one of the conveying rollers 23 through a horizontal coupling shaft, and the other bevel gear 27 is fixedly connected to the output shaft of the conveying drive motor 26.

[0064] A laterally extending sliding limit groove 28 is formed on the other side of the upper surface of the spraying workbench 1. A sliding base 29 is arranged above the sliding limit groove 28. A limit slider 30 is fixedly connected to the lower surface of the sliding base 29. The limit slider 30 is slidably clamped in the sliding limit groove 28.

[0065] Two symmetrically arranged sliding drive motors 31 are also fixedly connected to the upper surface of the spraying workbench 1. The end of the output shaft of each sliding drive motor 31 is fixedly connected to a laterally extending drive threaded rod 32. Each drive threaded rod 32 respectively passes through and is threadedly connected to the sliding base 29. The end of the drive threaded rod 32 is rotatably supported on the transverse outer wall of the support base 2.

[0066] A support vertical plate 33 is fixedly connected to the middle of the upper surface of the sliding base 29. The pretreatment assembly includes a connecting half cylinder 34 fixedly connected to the transverse end surface of the support vertical plate 33. The connecting half cylinder 34 is externally connected to a horizontal pretreatment mesh cylinder 35. The inner diameter of the pretreatment mesh cylinder 35 is the same as that of the connecting half cylinder 34. The outer diameter of the pretreatment mesh cylinder 35 is slightly smaller than the inner ring size of the adsorption tower housing to be sprayed.

[0067] The pre-treatment cylinder 35 is internally provided with coarse abrasive 36, the particle size of the coarse abrasive 36 is larger than the pore diameter of the pre-treatment cylinder 35, the coarse abrasive 36 is silicon carbide particles, and the Mohs hardness is ≥9.

[0068] On the transverse end surface on the other side of the supporting vertical plate 33, an electric control box 37 is fixedly connected. The electric control box 37 is externally connected to a control module 38. The control module 38 is arranged inside the connecting half-cylinder 34. Four electrically controlled telescopic cylinders 39 are arranged symmetrically around the center outside the control module 38. The telescopic ends of the electrically controlled telescopic cylinders 39 are fixedly connected to the supporting vertical plate 33. The four electrically controlled telescopic cylinders 39 are fixedly connected to the control module 38 through electric control pipelines.

[0069] The telescopic ends of the four electrically controlled telescopic cylinders 39 are fixedly connected with a transverse pushing circular plate 40, and the transverse pushing circular plate 40 is arranged closely against the inner peripheral wall of the connecting half-cylinder 34.

[0070] At the center of the back surface of the transverse pushing circular plate 40, a turning driving motor 41 is fixedly connected. The end of the output shaft of the turning driving motor 41 passes through the transverse pushing circular plate 40 and is fixedly connected with a turning transverse shaft 42. A number of turning paddle blades 43 are symmetrically arranged around the center on the turning transverse shaft 42, and the turning paddle blades 43 are arranged closely against the inner peripheral wall of the pre-treatment cylinder 35.

[0071] The drying and curing assembly is arranged directly above the pre-treatment assembly. The drying and curing assembly includes an inner air box 44 and an outer air box 45. Both the inner air box 44 and the outer air box 45 are fixedly connected to the supporting vertical plate 33 and are respectively arranged on the inner and outer sides thereof. A communicating pipe 46 is arranged between the inner air box 44 and the outer air box 45.

[0072] On the transverse outer wall of the outer air box 45, a fan driving motor 47 is fixedly connected. The end of the output shaft of the fan driving motor 47 extends into the outer air box 45 and is fixedly connected with a fan impeller 48.

[0073] An annular electric heating tube 49 is fixedly arranged inside the inner air box 44. Two symmetrically arranged power supply modules 50 are fixedly connected to the outer peripheral wall of the inner air box 44, and the power supply modules 50 are connected to the annular electric heating tube 49 for power supply.

[0074] On the transverse end surface of the inner air box 44, a horizontal drying cylinder 51 is fixedly connected. A number of air flow nozzles 52 are fixedly connected to the drying cylinder 51 along the circumferential and axial directions.

[0075] The inner air box 44 is externally connected to four intake elbow pipes 53, and the end of each intake elbow pipe 53 is respectively fixedly connected and communicated with the drying cylinder 51.

[0076] The first spraying seat 54 and the second spraying seat 55 with symmetrical double spraying components are respectively fixedly connected with a horizontal first telescopic cylinder 56 and a second telescopic cylinder 57 on the supporting vertical plate 33. The telescopic end of the first telescopic cylinder 56 is fixedly connected to the first spraying seat 54, and the telescopic end of the second telescopic cylinder 57 is fixedly connected to the second spraying seat 55. A primer spray gun 58 is rotatably provided at the end of the first spraying seat 54, and a topcoat spray gun 59 is rotatably provided at the end of the second spraying seat 55.

[0077] A first fixing plate 60 is fixedly connected to the lateral side end face of the first spraying seat 54. A first steering wheel 61 is provided on the first fixing plate 60. A first swinging seat 62 is fixedly connected to the side end face of the first steering wheel 61. The primer spray gun 58 is fixedly connected to the lower end of the first swinging seat 62.

[0078] A first driving motor 63 is fixedly connected to the back of the first fixing plate 60. The end of the output shaft of the first driving motor 63 passes through the first fixing plate 60 and is fixedly connected with a first driving wheel 64. The first driving wheel 64 is in contact transmission with the first steering wheel 61.

[0079] A primer supply pump 65 is fixedly connected to the longitudinal outer wall of the first spraying seat 54. A primer proportioning tank 66 is fixedly connected to the lateral end face of the supporting vertical plate 33 corresponding to the first spraying seat 54. A proportioning stirring mechanism is provided in the primer proportioning tank 66.

[0080] The primer proportioning tank 66 is externally connected with a first spiral pipe 67. The first spiral pipe 67 passes through the supporting vertical plate 33 and is fixedly connected and communicated to the primer supply pump 65. The primer supply pump 65 is externally connected with a primer supply pipe 68. The primer supply pipe 68 sequentially passes through the first fixing plate 60, the first steering wheel 61, and the first swinging seat 62, and is fixedly connected and communicated to the primer spray gun 58.

[0081] The proportioning stirring mechanism includes a stirring drive motor 69. The stirring drive motor 69 is fixedly connected to the center of the lower surface of the primer proportioning tank 66. The end of the output shaft of the stirring drive motor 69 passes upward through the primer proportioning tank 66 and is fixedly connected with a stirring vertical shaft 70. A plurality of stirring blades 71 are fixedly connected to the stirring vertical shaft 70.

[0082] A second fixing plate 72 is fixedly connected to the lateral side end face of the second spraying seat 55. A second steering wheel 73 is provided on the second fixing plate 72. A second swinging seat 74 is fixedly connected to the side end face of the second steering wheel 73. The topcoat spray gun 59 is fixedly connected to the lower end of the second swinging seat 74.

[0083] A second driving motor 75 is fixedly connected to the back of the second fixing plate 72. The end of the output shaft of the second driving motor 75 passes through the second fixing plate 72 and is fixedly connected with a second driving wheel 76. The second driving wheel 76 is in contact transmission with the second steering wheel 73.

[0084] A topcoat supply pump 77 is fixedly connected to the longitudinal outer wall of the second spraying seat 55. A topcoat proportioning tank 78 is fixedly connected to the transverse end face of the support vertical plate 33 corresponding to the second spraying seat 55. A proportioning and stirring mechanism is also provided in the topcoat proportioning tank 78.

[0085] The topcoat proportioning tank 78 is externally connected to a second spiral tube 79. The second spiral tube 79 passes through the support vertical plate 33 and is fixedly connected and communicated to the topcoat supply pump 77. The topcoat supply pump 77 is externally connected to a topcoat supply pipe 80. The topcoat supply pipe 80 sequentially passes through the second fixing plate 72, the second steering wheel 73, and the second swinging seat 74, and is fixedly connected and communicated to the topcoat spray gun 59.

[0086] When the present invention is in use: In the initial state, the clamping and transferring assembly is located above the conveyor belt 24. A single adsorption tower housing is placed flat on the conveyor belt 24 with the opening facing downwards. Then, the conveyor driving motor 26 is periodically started. Through the transmission of two bevel gears 27, the conveyor roller 23 is driven to rotate, and then the conveyor belt 24 is driven to circulate and roll, moving the adsorption tower housing to directly below the clamping and positioning block 19. The hydraulic telescopic cylinder 18 is controlled to extend, driving the clamping and positioning block 19 to move down until its lower surface abuts against the upper end of the adsorption tower housing. Then, the clamping telescopic cylinder 20 is controlled to shorten, and the adsorption tower housing is clamped by four arc-shaped clamping plates 21; the transmission driving motor 6 is started, and the transmission driving motor 6 drives the transmission side wheel to rotate. Through the transmission of the transmission belt 8 and the central transmission wheel 5, the clamping side plate 3 is driven to rotate 180°, thereby transferring the adsorption tower housing between the clamping side plate 3 and the supporting vertical plate 33; two flipping driving motors 15 are respectively started, and the flipping driving motors 15 drive the flipping seats 14 to rotate counterclockwise by 90°, controlling the adsorption tower housing to swing up to a horizontal state; the steering driving motor 12 is started, and the steering driving motor 12 drives the circular turntable 11 to rotate 180°. At this time, the adsorption tower housing is horizontally opposite to the pretreatment mesh cylinder 35; two sliding driving motors 31 are respectively started, and the sliding driving motors 31 drive the driving threaded rods 32 to rotate, and then drive the sliding base 29 to slide horizontally towards the supporting base 2 until the adsorption tower housing is sleeved onto the pretreatment mesh cylinder 35; the electric control box 37 is started, and the electric control telescopic cylinder 39 is controlled to extend, pushing the transverse pushing circular plate 40 to move. At the same time, the turning material driving motor 41 is started, and the turning material driving motor 41 drives the turning material cross shaft 42 and the turning material blades 43 to rotate, thereby realizing the turning of the coarse abrasive 36. During the turning process, a part of the coarse abrasive 36 passes through the mesh holes on the pretreatment mesh cylinder 35 and contacts and rubs against the inner peripheral wall of the adsorption tower housing, thereby increasing the roughness of the inner peripheral wall of the adsorption tower housing and eliminating defects; the hydraulic telescopic cylinder 18 is controlled to retract, so that the adsorption tower housing is separated from the pretreatment mesh cylinder 35; the steering driving motor 12 is started again, and the steering driving motor 12 drives the circular turntable 11 to rotate clockwise by 90°. At the same time, the flipping driving motor 15 is started, and the flipping driving motors 15 drive the flipping seats 14 to rotate counterclockwise by 90°, driving the adsorption tower housing to swing to the longitudinal direction, and a worker holds a vacuum cleaner or the like to blow and clean the grinding waste chips in the adsorption tower housing. After the cleaning is completed, the adsorption tower housing is controlled to swing to the transverse direction again; the hydraulic telescopic cylinder 18 is controlled to extend, moving the adsorption tower housing to the outside of the first spraying seat 54. The primer raw material is put into the primer proportioning tank 66, the stirring driving motor 69 is started, and the raw material is stirred and proportioned by the stirring blades 71. The primer supply pump 65 is started, and the primer is pumped out of the primer proportioning tank 66 by the first spiral pipe 67 and then injected into the primer spray gun 58 through the primer supply pipe 68;Start the first drive motor 63 to drive the primer spray gun 58 to swing circumferentially. At the same time, start the rotation drive motor 16, and the rotation drive motor 16 drives the adsorption tower housing in the clamp to rotate around the axis. Then turn on the primer spray gun 58 to spray the primer inside the adsorption tower housing. Control the hydraulic telescopic cylinder 18 to retract. At the same time, start the steering drive motor 12 to drive the circular turntable 11 to rotate clockwise by 90°. Then control the hydraulic telescopic cylinder 18 to extend and fit the adsorption tower housing outside the drying cylinder 51. Start the fan drive motor 47, and the fan drive motor 47 drives the fan impeller 48 to rotate, sucking outside air into the outer air box 45. The air then enters the inner air box 44 through the connecting pipe 46, is heated by the annular electric heating pipe 49, and then enters the drying cylinder 51 through the intake elbow 53 and is finally ejected through the air flow nozzle 52 to dry and cure the primer inside the adsorption tower housing. After the primer is dried, control the hydraulic telescopic cylinder 18 to retract. At the same time, start the steering drive motor 12 to drive the circular turntable 11 to rotate clockwise by 90°. Then control the hydraulic telescopic cylinder 18 to extend and move the adsorption tower housing to the outside of the second spraying seat 55, and repeat the above spraying operation to spray the topcoat inside the adsorption tower housing using the topcoat spray gun 59. After the topcoat is sprayed, transfer the adsorption tower housing to the drying and curing assembly for topcoat curing. After spraying, transfer the adsorption tower housing to the conveyor belt 24 again through the clamping and transfer assembly for transportation.;

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. Spraying equipment for anti-corrosion treatment inside the adsorption tower of a pressure swing adsorption nitrogen generator, characterized by: It includes a spraying workbench, on which a conveying and loading component, a clamping and transferring component, a pretreatment component, a double spraying component and a drying and curing component are respectively provided, and the pretreatment component, the double spraying component and the drying and curing component are arranged on the same circular track; The clamping transfer assembly comprises a supporting base, a clamping side plate is rotatably provided on the supporting base, a circular rotating plate is rotatably provided on the side of the clamping side plate, a flip limit frame is fixedly connected to the lower side of the lateral outer end surface of the circular rotating plate, a flip seat is provided in the flip limit frame, an intermediate rotating disk is rotatably installed on the middle part of the lower surface of the flip seat, a clamping positioning block is telescopically provided on the intermediate rotating disk, and an arc clamping plate is telescopically provided on each side end surface of the clamping positioning block; A sliding base is provided on one side of the upper surface of the spraying workbench, a supporting vertical plate is fixedly connected to the middle of the upper surface of the sliding base, the pretreatment component comprises a connecting half-cylinder fixedly connected to the transverse end surface of the supporting vertical plate, the connecting half-cylinder is externally connected to a horizontal pretreatment net cylinder, the pretreatment net cylinder is internally provided with coarse-grained abrasive, the particle size of the coarse-grained abrasive is larger than the aperture of the pretreatment net cylinder, and the pretreatment net cylinder is also provided with a plurality of centrally symmetrical material turning paddles; The double spraying assembly comprises a first spraying seat and a second spraying seat symmetrically arranged, and the support vertical plate is respectively fixed with a first horizontal telescopic cylinder and a second telescopic cylinder, the telescopic end of the first telescopic cylinder is fixed to the first spraying seat, and the telescopic end of the second telescopic cylinder is fixed to the second spraying seat, and a primer spray gun is rotatably provided at the end of the first spraying seat, and a topcoat spray gun is rotatably provided at the end of the second spraying seat.

2. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The drying and curing assembly is arranged directly above the pretreatment assembly, and the drying and curing assembly comprises an inner bellows and an outer bellows, both of which are fixedly connected to the support vertical plate and are arranged on the inner and outer sides thereof, and a connecting pipe is fixedly arranged between the inner bellows and the outer bellows; A fan drive motor is fixedly connected to the transverse outer wall of the outer wind box, and the output shaft end of the fan drive motor extends into the inner part of the outer wind box and is fixedly connected to a fan impeller; An annular electric heating tube is fixedly arranged in the inner bellows, and two power supply modules symmetrical in upper and lower directions are fixedly connected to the outer peripheral wall of the inner bellows, and the power supply modules are connected to the annular electric heating tube for power supply; A horizontal drying column is fixedly connected to the transverse end surface of the inner bellows, and a plurality of air flow nozzles are fixedly connected to the drying column along the circumferential direction and the axial direction; The inner bellows is externally connected to four air intake elbows, and the end of each of the air intake elbows is respectively fixedly connected to the drying column.

3. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: A longitudinally extending conveying clamp is fixedly connected to one side of the upper surface of the spraying workbench, and the conveying clamp is arranged in parallel with the supporting base. The conveying and loading assembly includes two symmetrically arranged conveying rollers, which are rotatably installed between the conveying clamp and the supporting base, and a conveyor belt is sleeved between the two conveying rollers; A transmission box is fixedly connected to the transverse outer wall of the conveying splint, and a conveying drive motor is fixedly connected to the longitudinal side wall of the transmission box. Two meshing bevel gears are arranged in the transmission box, one of the bevel gears is fixedly connected to the side end face of one of the conveying rollers through a horizontal connecting shaft, and the other bevel gear is fixedly connected to the output shaft of the conveying drive motor.

4. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The support base is a U-shaped seat extending longitudinally and opening downward, the lower end of the support base is fixedly connected to the upper surface of the spraying workbench, the middle part of the lower surface of the clamping side plate is fixedly connected with a vertical connecting shaft, the end of the connecting shaft passes downward through the support base and is fixedly connected with a central transmission wheel; A transmission drive motor is fixedly connected to one side of the upper surface of the support base, the output shaft end of the transmission drive motor passes downward through the support base and is fixedly connected to a side transmission wheel, and a transmission belt is sleeved between the side transmission wheel and the central transmission wheel; A rotation avoidance opening is respectively provided on each longitudinal side end surface of the clamping side plate, and the rotation avoidance opening can avoid the transmission drive motor during the rotation of the clamping side plate.

5. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 4 is characterized in that: A rotating installation opening is opened on one lateral end surface of the clamping side plate, and the circular rotating plate is rotatably arranged in the rotating installation opening. A steering drive motor is fixedly connected to the other lateral end surface of the clamping side plate, and the output shaft end of the steering drive motor passes through the clamping side plate and is fixedly connected to the back side of the circular rotating plate.

6. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1, characterized in that: The flip limit frame is a U-shaped frame which is horizontally arranged and transversely opened, and a flip drive motor is fixedly connected to each longitudinal outer wall of the flip limit frame, and the output shaft end of the flip drive motor passes through the flip limit frame and is fixedly connected to the side end surface of the flip seat; A rotating drive motor is fixedly connected to the middle of the upper surface of the flip seat, and the end of the output shaft of the rotating drive motor passes downward through the flip seat and is fixedly connected to the intermediate turntable. A hydraulic telescopic cylinder is fixedly connected to the center of the lower surface of the intermediate turntable, and the lower telescopic end of the hydraulic telescopic cylinder is fixedly connected to the upper surface of the clamping positioning block. The clamping positioning block is a horizontally arranged square block, and a clamping telescopic cylinder is respectively fixedly connected to each side end face of the clamping positioning block, and the telescopic end of the clamping telescopic cylinder is fixedly connected to the corresponding arc-shaped clamping plate.

7. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1, characterized in that: The upper surface of the spraying workbench is provided with a sliding limit groove extending laterally, the lower surface of the sliding base is fixedly connected to a limit slider, and the limit slider is slidably mounted in the sliding limit groove; The upper surface of the spraying workbench is also fixedly connected to two symmetrically arranged sliding drive motors, and the end of the output shaft of each sliding drive motor is fixedly connected to a laterally extending driving threaded rod, and each of the driving threaded rods passes through and is threadedly connected to the sliding base respectively, and the end of the driving threaded rod is rotatably supported on the lateral outer wall of the support base.

8. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1 is characterized in that: The inner diameter of the pretreatment net cylinder is the same as that of the connecting half cylinder, and the outer diameter of the pretreatment net cylinder is slightly smaller than the inner circle size of the adsorption tower shell to be sprayed; An electric control box is fixedly connected to the lateral end surface of the other side of the support vertical plate, and the electric control box is externally connected to a control module, and the control module is arranged in the connecting half cylinder. Four centrally symmetrical electric control telescopic cylinders are arranged on the outside of the control module, and the telescopic ends of the electric control telescopic cylinders are fixedly connected to the support vertical plate. The four electric control telescopic cylinders are fixedly connected to the control module through electric control pipelines; The telescopic ends of the four electrically controlled telescopic cylinders are fixedly connected with a transverse push circular plate, and the transverse push circular plate is arranged closely against the inner peripheral wall of the connecting half cylinder; A material turning drive motor is fixedly connected to the center of the back side of the horizontal pushing circular plate, the end of the output shaft of the material turning drive motor passes through the horizontal pushing circular plate and is fixedly connected to a material turning horizontal axis, a plurality of material turning paddles are fixedly connected to the material turning horizontal axis in a centrally symmetrical manner, and the material turning paddles are arranged closely against the inner circumferential wall of the pretreatment net cylinder.

9. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 1, characterized in that: A first fixing plate is fixedly connected to the lateral side end surface of the first spraying seat, a first steering wheel is provided on the first fixing plate, a first swing seat is fixedly connected to the side end surface of the first steering wheel, and the primer spray gun is fixedly connected to the lower end of the first swing seat; A first driving motor is fixedly connected to the back of the first fixing plate, an output shaft end of the first driving motor passes through the first fixing plate and is fixedly connected to a first driving wheel, and the first driving wheel is in contact with the first steering wheel for transmission; A primer supply pump is fixedly connected to the longitudinal outer wall of the first spray seat, and a primer proportioning box is fixedly connected to the transverse end surface of the supporting vertical plate corresponding to the first spray seat, and a proportioning and stirring mechanism is provided in the primer proportioning box; The primer proportioning box is externally connected to a first spiral tube, the first spiral tube passes through the support vertical plate and is fixedly connected to the primer supply pump, the primer supply pump is externally connected to a primer supply pipe, the primer supply pipe passes through the first fixed plate, the first steering wheel, the first swing seat in sequence, and is fixedly connected to the primer spray gun; The proportioning and stirring mechanism includes a stirring drive motor, which is fixedly connected to the center of the lower surface of the primer proportioning box. The end of the output shaft of the stirring drive motor passes upward through the primer proportioning box and is fixedly connected to a stirring vertical shaft, on which a plurality of stirring blades are fixedly connected.

10. The spraying equipment for anti-corrosion treatment of the interior of the adsorption tower of a pressure swing adsorption nitrogen generator according to claim 9, characterized in that: A second fixing plate is fixedly connected to the lateral side end surface of the second spraying seat, a second steering wheel is provided on the second fixing plate, a second swing seat is fixedly connected to the side end surface of the second steering wheel, and the topcoat spray gun is fixedly connected to the lower end of the second swing seat; A second driving motor is fixedly connected to the back of the second fixing plate, an output shaft end of the second driving motor passes through the second fixing plate and is fixedly connected to a second driving wheel, and the second driving wheel contacts and drives the second steering wheel; A topcoat supply pump is fixedly connected to the longitudinal outer wall of the second spraying seat, a topcoat proportioning box is fixedly connected to the transverse end surface of the supporting vertical plate corresponding to the second spraying seat, and the topcoat proportioning box is also provided with the proportioning stirring mechanism with the same structure; The topcoat mixing box is externally connected to a second spiral tube, which passes through the supporting vertical plate and is fixedly connected to the topcoat supply pump. The topcoat supply pump is externally connected to a topcoat supply pipe, which passes through the second fixed plate, the second steering wheel, and the second swing seat in sequence and is fixedly connected to the topcoat spray gun.

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