Water-based paint spraying device and method for steel structure

Abstract

The invention relates to the technical field of water-based paint spraying devices, in particular to a water-based paint spraying device for a steel structure and a spraying method.The water-based paint spraying device comprises a shot blasting unit, an edge polishing unit, a blending unit and a spraying unit, and the blending unit comprises a rack and a first water tank, a second water tank and a blending tank which are arranged on the rack; a rotating sleeve rotating along the axis of the blending tank is arranged in the blending tank, and a driving mechanism for driving the rotating sleeve to rotate is arranged on the rack; a stirring shaft is arranged outside the lower end of the rotating sleeve, a water pipe is arranged at the upper end of the rotating sleeve in the radial direction, and a plurality of nozzles are distributed on the water pipe along the axis; a plurality of water pumping pipes communicated with the water pipe are arranged in the rotating sleeve, pistons are arranged in the water pumping pipes, a reciprocating lifting mechanism is arranged at the lower end in the rotating sleeve, the operation of gradually adding water is realized through the rotating sleeve, the driving mechanism, the water pipe, the water pumping pipes, the pistons and the reciprocating lifting mechanism, and the viscosity of the coating is detected in real time through a plurality of viscosity sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of water-based paint spraying devices, in particular to a water-based paint spraying device for a steel structure, and in particular to a spraying method for a water-based paint spraying device for a steel structure. Background Art

[0002] In the field of steel structure processing and coating, water-based paint is increasingly favored due to its environmental protection and low volatile organic compound (VOC) emission characteristics. However, the spraying effect and quality of water-based paint depend to a large extent on the precise control of its mixing process. The traditional method of mixing water-based paint often relies on the experience and habits of workers, which easily leads to a series of problems in actual operation. Workers may not understand the characteristics of water-based paint enough, or be influenced by long-term construction habits, and add all the water to the paint at one time during the watering process, resulting in the paint being unable to be fully mixed with water, resulting in uneven mixing. This uneven mixing state will directly affect the fluidity and adhesion of the paint.

[0003] In addition, the traditional water-based paint mixing method lacks precise measurement and control methods. Workers usually determine the water-to-water ratio based on experience or rough estimation, which not only makes it difficult to ensure the accuracy of the ratio, but also makes it impossible to monitor the viscosity changes of the paint in real time during the mixing process. Viscosity is one of the important factors affecting the spraying effect of paint. Too high or too low viscosity will lead to uneven coating, sagging or dry spraying.

[0004] In order to solve the above problems, there is an urgent need in the prior art for a mixing device that can accurately control the water-to-water ratio of water-based paint, achieve gradual water addition and monitor the viscosity of the paint in real time. Summary of the invention

[0005] In view of the above problems, a water-based paint spraying device and a spraying method with a steel structure are provided, in which a piston in a water pumping pipe is driven to move up and down by a lifting rod. When the piston moves down, the water in the second water tank is gradually sucked into the water pumping pipe; when the piston moves up, the water in the water pumping pipe is gradually introduced into the water pipe and sprayed onto the paint in the mixing tank through a nozzle, thereby realizing the operation of gradually adding water, and the viscosity of the paint is detected in real time through multiple viscosity sensors.

[0006] In order to solve the problems of the prior art, the present invention provides a water-based paint spraying device of a steel structure, comprising a shot blasting unit, an edge grinding unit, a mixing unit and a spraying unit, wherein the mixing unit comprises a frame and a first water tank, a second water tank and a mixing tank respectively arranged on the frame;

[0007] The mixing tank is vertically arranged on the frame, a feed pipe is arranged at the upper end of the mixing tank, a discharge pipe is arranged at the lower end of the mixing tank, and a pump is connected to the end of the discharge pipe;

[0008] The first water tank and the second water tank are connected via a first pipe, and a water pump is connected to the first pipe;

[0009] A rotating sleeve rotating along its axis is provided inside the mixing tank, and a driving mechanism driving the rotating sleeve to rotate is provided on the frame;

[0010] A plurality of stirring shafts are arranged outside the lower end of the rotating sleeve, a plurality of water pipes are arranged along the radial direction of the upper end of the rotating sleeve, and a plurality of nozzles are distributed on the water pipes along the axis thereof;

[0011] A plurality of water pumping pipes connected to the water pipes are arranged inside the rotating sleeve, a water supply connection structure is arranged on the top of the mixing tank, the water supply connection structure is connected to each water pumping pipe through a second pipe, the second water tank is connected to the water supply connection structure through a third pipe, a piston is arranged inside the water pumping pipe, a reciprocating lifting mechanism is arranged at the lower end of the interior of the rotating sleeve, the reciprocating lifting mechanism includes a lifting rod connected to each piston, and is used to drive the piston to reciprocate along the water pumping pipe.

[0012] Preferably, the reciprocating lifting mechanism further comprises a sleeve and a movable plate;

[0013] The lower end of the rotating sleeve can rotate through the bottom of the mixing tank and extend downward for a certain distance. The outer portion of the rotating sleeve is axially connected to the bottom of the mixing tank through a first waterproof bearing. The sleeve is arranged directly below the rotating sleeve. The sleeve is composed of a first tube body and a second tube body. The second tube body is sleeved on the first tube body, and the second tube body is connected to the frame through a connecting plate.

[0014] The movable plate is arranged inside the first tube body and can move up and down along the inside of the first tube body. A guide plate that can move along the internal axis of the rotating sleeve is provided on the top of the movable plate. The guide plate is movably connected to the inside of the rotating sleeve through a limiting structure. The end of the lifting rod away from the piston is connected to the top of the guide plate. The movable plate is provided with a sliding column along its own radial direction, and a cam groove for the sliding column to move is opened on the inner wall of the first tube body.

[0015] Preferably, the limiting structure comprises a limiting slider which is radially arranged on the guide plate, and a strip-shaped limiting groove for the limiting slider to move along the axis of the rotating sleeve is arranged inside the rotating sleeve.

[0016] Preferably, a ball capable of slidingly cooperating with a cam groove provided in the first tube body is provided at the end of the sliding column, and the ball is freely rotatably provided at the end of the sliding column.

[0017] Preferably, the water supply connection structure comprises an extension plate, a diverter pipe, a fixed casing and a guide connection pipe;

[0018] The extension plate is spaced apart and arranged at one end of the rotating sleeve away from the casing;

[0019] The shunt pipe is vertically arranged on the extension plate, and the shunt pipe is connected to a second pipe, the axis of the shunt pipe intersects with the axis of the rotating sleeve, one end of each second pipe is respectively connected to the inside of the shunt pipe, and the upper end of the shunt pipe can be rotated to pass through the top of the batching tank;

[0020] The fixed sleeve is arranged at the top center of the batching tank, and a water inlet pipe extends upward from the center of the fixed sleeve. One end of the third pipe is connected to the water inlet pipe, and the extended end of the diversion pipe extends to the inside of the water inlet pipe. A second waterproof bearing is arranged between the diversion pipe and the water inlet pipe.

[0021] Preferably, a first one-way valve is disposed inside the second pipeline, and a second one-way valve is disposed inside the water pipe.

[0022] Preferably, the plurality of nozzles are inclined and staggered along the axis of the water pipe.

[0023] Preferably, one end of the stirring shaft on the rotating sleeve is rotatably arranged on the outside of the rotating sleeve, and one end of the stirring shaft extends into the inside of the rotating sleeve. The stirring shaft and the rotating sleeve are axially connected through a third waterproof bearing. The end of the stirring shaft extending into the inside of the rotating sleeve is connected to a worm gear, and a worm meshing with the worm gear is provided below the worm gear. The worm is horizontally arranged, and a bracket is provided in the rotating sleeve. Both ends of the worm are rotatably arranged on the bracket, and a transmission structure that can drive the worm to rotate is provided on the top of the guide plate.

[0024] Preferably, the transmission structure comprises a rack which is vertically arranged on the top of the guide plate, and the outer part of the worm is provided with a gear which can mesh with the rack.

[0025] The present invention also provides a spraying method of a water-based paint spraying device for a steel structure, which is applied to the water-based paint spraying device for the steel structure, and comprises the following steps:

[0026] S1. Shot blast the steel structure with a shot blasting unit to remove rust, oil and impurities on the surface and improve the adhesion of the coating;

[0027] S2. Grind the edges of the steel structure parts by edge grinding unit to remove sharp edges and burrs;

[0028] S3. The water-based paint is mixed with water by a mixing unit, and the water-mixing ratio of the water-based paint is between 5% and 20%. The specific ratio should be adjusted according to the viscosity of the paint and the spraying method.

[0029] S4. Spray the steel structure through the spray unit, which includes a paint supply system and a spray gun. During the spraying process, the spray gun is moved at a uniform speed to ensure that the coating is uniform and without omissions; spray 1-2 times, and adjust the oil output and air flow of the spray gun to control the thickness of the coating;

[0030] S5. After the steel structure is sprayed, the water-based paint on the steel structure is air-dried. During the air-drying process, the temperature and humidity of the construction site should be controlled. The air-drying time is generally 2 to 3 hours. The specific time should be determined based on the type and thickness of the paint and the environmental conditions of the construction site.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. While the rotating sleeve rotates, each lifting rod can move up and down, and the piston in the water pumping pipe is driven up and down by the lifting rod. When the piston moves down, the water in the second water tank will be gradually sucked into the water pumping pipe; when the piston moves up, the water in the water pumping pipe will be gradually introduced into the water pipe, and sprayed onto the paint in the mixing tank through the nozzle, so as to realize the operation of gradual water addition. By gradually adding water, on the one hand, water can be added evenly, and on the other hand, it can avoid the uneven mixing of the paint caused by adding water too quickly due to one-time water addition. The prepared water-based paint is more uniform when spraying the steel structure in the future.

[0033] 2. When the extension plate moves up and down along the rotating sleeve, it drives the worm to rotate through the rotating mechanism. After the worm rotates, it drives the worm wheel to rotate through the gear meshing mechanism, and the worm wheel then drives the stirring shaft connected to it to rotate. Therefore, during the rotation of the rotating sleeve, the stirring shaft can rotate synchronously, thereby achieving uniform mixing of water and paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the mixing unit in the present invention.

[0035] Figure 2 It is a structural cross-sectional view of the mixing unit in the present invention.

[0036] Figure 3 It is a three-dimensional structural cross-sectional view of the mixing unit in the present invention.

[0037] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0038] Figure 5 It is a three-dimensional structural sectional view of the mixing tank in the present invention.

[0039] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0040] Figure 7 yes Figure 5 Enlarged view of point C in the middle.

[0041] Figure 8 It is a partial three-dimensional structural schematic diagram of the rotating sleeve in the present invention.

[0042] Fig. 9 It is a schematic diagram of the internal structure of the rotating sleeve in the present invention.

[0043] Fig.10 It is a partial three-dimensional structural sectional view of the rotating sleeve in the present invention.

[0044] Fig.11 It is a schematic diagram of the local internal structure of the rotating sleeve in the present invention.

[0045] Fig.12 yes Fig.11 Enlarged view of point D in the middle.

[0046] Fig.13 It is a structural exploded view of the sleeve in the present invention.

[0047] Fig.14 yes Fig.13 Enlarged view of point E in the middle.

[0048] Fig.15 It is a flow chart of the spraying method of the present invention.

[0049] The numbers in the figure are: 1, shot blasting unit; 2, edge grinding unit; 3, mixing unit; 31, frame; 311, driving mechanism; 32, first water tank; 321, first pipeline; 322, water pump; 33, second water tank; 331, third pipeline; 34, mixing tank; 341, feed pipe; 342, discharge pipe; 3421, feed pump; 343, rotating sleeve; 3431, stirring shaft; 34311, worm gear; 34312, worm; 3432, transmission structure; 34321, rack; 34322, gear; 3433, water pipe; 34331, nozzle; 34332, second one-way valve; 344, water pipe; 3441, piston; 345, water supply connection structure ; 3451, second pipeline; 34511, first one-way valve; 3452, extension plate; 3453, diverter pipe; 3454, fixed casing; 34541, water inlet pipe; 3455, guide connecting pipe; 3456, second waterproof bearing; 346, reciprocating lifting mechanism; 3461, lifting rod; 3462, sleeve; 34621, connecting plate; 3463, movable plate; 34631, sliding column; 34632, ball bearing; 34633, cam groove; 3464, guide plate; 34651, limit slider; 34652, strip limit groove; 35, controller; 36, viscosity sensor; 4, spray unit; 34622, first tube body; 34623, second tube body. DETAILED DESCRIPTION

[0050] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] like Fig.15 As shown, when the spraying device of the present invention sprays paint on a steel structure, the steel structure needs to be processed by a shot blasting unit 1 and an edge grinding unit 2, and then the paint is mixed by a mixing unit 3 and then sprayed on the steel structure by a spraying unit 4 to complete the paint spraying operation. Figure 1 as well as Figure 2 As shown, the mixing unit 3 in this embodiment includes a frame 31 and a first water tank 32, a second water tank 33 and a mixing tank 34 respectively arranged on the frame 31; the mixing tank 34 is vertically arranged on the frame 31, and a feeding pipe 341 is arranged at the upper end of the mixing tank 34, and a discharging pipe 342 is arranged at the lower end of the mixing tank 34, and a suction pump 3421 is connected to the end of the discharge pipe 342; the first water tank 32 and the second water tank 33 are connected by a first pipe 321, and the first pipe 321 is connected to the water pump 322; a rotating sleeve 343 rotating along its axis is arranged inside the mixing tank 34, and a driving mechanism 311 for driving the rotating sleeve 343 to rotate is arranged on the frame 31; a plurality of stirring shafts 3431 are arranged on the outside of the lower end of the rotating sleeve 343, and a plurality of water pipes 3433 are arranged on the upper end of the rotating sleeve 343 along its radial direction, and a plurality of nozzles 34331 are distributed on the water pipe 3433 along its axis.

[0052] In this embodiment, Figure 1-4 As shown, a plurality of water pumping pipes 344 connected to the water pipe 3433 are provided inside the rotating sleeve 343, a water supply connection structure 345 is provided on the top of the mixing tank 34, and the water supply connection structure 345 is connected to each water pumping pipe 344 through a second pipe 3451, and the second water tank 33 is connected to the water supply connection structure 345 through a third pipe 331, as shown in FIG. Figure 2 as well as Figure 3 As shown, in this embodiment, a piston 3441 is provided inside the water pumping pipe 344, and a reciprocating lifting mechanism 346 is provided at the lower end of the inner part of the rotating sleeve 343. The reciprocating lifting mechanism 346 includes a lifting rod 3461 connected to each piston 3441, which is used to drive the piston 3441 to reciprocate along the water pumping pipe 344.

[0053] like Figure 1 As shown, the water-based paint spraying device for steel structure in this embodiment also includes a controller 35 and a viscosity sensor 36. The viscosity sensor 36 is provided in multiple numbers and is evenly distributed inside the mixing tank 34. The controller 35 is arranged on the frame 31. The viscosity sensor 36, the driving mechanism 311, the feed pump 3421 and the water pump 322 are electrically connected to the controller 35 respectively.

[0054] In this embodiment, the welded steel structure is first processed, specifically including the shot blasting unit 1 and the edge grinding unit 2. After the processing, the water-based paint is diluted with water to mix the paint, specifically through the mixing unit 3. After mixing, the steel structure is sprayed. The specific process is as follows.

[0055] Processing of welded steel structures:

[0056] The steel structure is shot blasted by the shot blasting unit 1 to remove rust, oil stains and impurities on the surface and improve the adhesion of the coating.

[0057] The edge of the steel structure is ground by the edge grinding unit 2 to remove sharp edges and burrs.

[0058] Water-based paint mixing:

[0059] The water-based paint is mixed with water by the mixing unit 3. The water-based paint mixing ratio should be determined according to the actual situation on site. The water adding ratio is between 5% and 20%. The specific ratio should be adjusted according to the viscosity of the paint and the spraying method. For example, it may be necessary to add 20% when spraying, but only 10% when brushing.

[0060] Steel structure spraying:

[0061] The steel structure is sprayed by the spray unit 4, which includes a paint supply system and a spray gun. The worker checks whether the spray gun and the paint supply system are working properly and adjusts the pressure and flow of the compressed air system. During the spraying process, the worker needs to keep the spray gun at a moderate distance from the surface of the steel structure, generally 40 to 60 cm, and move the spray gun at a uniform speed to ensure that the coating is uniform and without omissions. According to the customer's requirements for the thickness of the paint film, it is usually sprayed 1-2 times, and the oil output and air flow of the spray gun are adjusted to control the thickness of the coating.

[0062] After the steel structure is sprayed, the water-based paint on the steel structure is air-dried. During the air-drying process, the temperature and humidity of the construction site should be controlled. The air-drying time is generally 2 to 3 hours. The specific time should be determined according to the type and thickness of the paint and the environmental conditions of the construction site.

[0063] Based on the water-based paint mixing process in the above steps, the mixing process of water-based paint has a crucial impact on the subsequent painting effect and quality. If it is not mixed properly, the paint cannot be evenly attached to the surface of the steel structure after spraying, but flows along the wall or other vertical surfaces, forming an uneven coating. This phenomenon is often caused by workers' insufficient understanding of the characteristics of water-based paint, or long-term construction habits that are difficult to change. Especially in the water mixing process, workers may add all the water to the paint at once, resulting in the paint being unable to be fully mixed with water, resulting in uneven mixing.

[0064] When mixing water-based paint, you also need to follow these steps:

[0065] First, the water-addition ratio is determined according to the actual situation on site; the volume of the paint to be mixed is prepared in advance, and the prepared paint is fed into the batching tank through the feed pipe 341. According to the amount of paint fed into the batching tank, the water-addition ratio is calculated and determined by the controller 35.

[0066] After the water mixing ratio is determined, the pump 322 is driven by the controller 35 to pump the amount of water in the first water tank 32 calculated according to the water mixing ratio into the second water tank 33; at this time, the amount of water in the second water tank 33 is equal to the proportioned capacity.

[0067] When the water to be proportioned is injected into the second water tank 33 , the controller 35 starts the driving mechanism 311 , which is used to drive the rotating sleeve 343 to rotate. The driving mechanism 311 drives the rotating sleeve 343 to rotate, and then drives the stirring shaft 3431 to rotate, so as to stir the paint in the mixing tank 34 .

[0068] While the rotating sleeve 343 rotates, each lifting rod 3461 can move up and down, and the piston 3441 in the water suction pipe 344 is driven to move up and down through the lifting rod 3461; when the piston 3441 moves downward, the water in the second water tank 33 will be gradually sucked into the water suction pipe 344; when the piston 3441 moves upward, the water in the water suction pipe 344 will be gradually introduced into the water pipe 3433, and sprayed onto the paint in the mixing tank 34 through the nozzle 34331, thereby realizing the operation of gradually adding water.

[0069] By gradually adding water, on the one hand, water can be added evenly, and on the other hand, it can avoid adding water too quickly due to adding water all at once, which will cause uneven mixing of the paint. The prepared water-based paint will make the subsequent spraying of the steel structure more uniform.

[0070] When mixing is completed, the controller 35 starts each viscosity sensor 36 to detect the viscosity of the mixed paint in the mixing tank 34 and sends the data to the controller 35; if it is detected that the paint viscosity is unqualified, paint or water is added according to the situation and mixed again through the above steps until the viscosity sensor 36 detects that it is qualified.

[0071] Reference Figures 2 to 4 and Figure 6 as well as Fig.13 As shown: the reciprocating lifting mechanism 346 also includes a sleeve 3462 and a movable plate 3463;

[0072] The lower end of the rotating sleeve 343 can rotate to pass through the bottom of the mixing tank 34 and extend downward for a certain distance. The outside of the rotating sleeve 343 is axially connected to the bottom of the mixing tank 34 through a first waterproof bearing. The rotating sleeve 343 is connected to the power mechanism on the outside through a transmission assembly. The power mechanism can drive the rotating sleeve 343 to rotate through the transmission assembly. In this embodiment, the sleeve 3462 is arranged directly below the rotating sleeve 343. The sleeve 3462 is composed of a first tube body 34622 and a second tube body 34623. The second tube body 34623 is sleeved on the first tube body 34622, and the second tube body 34623 is connected to the frame 31 through a connecting plate 34621.

[0073] The movable plate 3463 is arranged in the first tube body 34622 and can move up and down along the inside of the first tube body 34622. A guide plate 3464 is arranged on the top of the movable plate 3463 and can move along the inner axis of the rotating sleeve 343. The guide plate 3464 is movably connected to the inside of the rotating sleeve 343 through a limiting structure. The end of the lifting rod 3461 away from the piston 3441 is connected to the top of the guide plate 3464. Figure 5 , Figure 6 , Fig.13 as well as Fig.14 As shown, the movable plate 3463 is provided with a sliding post 34631 along its radial direction, and the inner wall of the first tube body 34622 is provided with a cam groove 34633 for the sliding post 34631 to move.

[0074] When the rotating sleeve 343 rotates, the limiting structure drives the guide plate 3464 to rotate accordingly, and the rotation of the guide plate 3464 further drives the movable plate 3463 to rotate. At this time, the movable plate 3463 moves along the cam groove 34633 on the inner wall of the first tube body 34622 through the sliding column 34631; the cooperation between the sliding column 34631 and the cam groove 34633 enables the movable plate 3463 and the guide plate 3464 to achieve up and down reciprocating movement, and the reciprocating motion of the movable plate 3463 is transmitted to the piston 3441 through the lifting rod 3461, thereby realizing the up and down reciprocating motion of the piston 3441.

[0075] Reference Fig.10As shown: the limiting structure includes a limiting slider 34651, which is radially arranged on the guide plate 3464, and a strip-shaped limiting groove 34652 is arranged inside the rotating sleeve 343 for the limiting slider 34651 to move along the axis of the rotating sleeve 343. When the rotating sleeve 343 rotates, the limiting slider 34651 set on the guide plate 3464 is restricted in the strip limiting groove 34652; the length direction of the strip limiting groove 34652 remains parallel to the axis of the rotating sleeve 343. Through the cooperation of the limiting slider 34651 and the strip limiting groove 34652, the rotating sleeve 343 can drive the guide plate 3464 and the movable plate 3463 to rotate while rotating. In addition, when the movable plate 3463 rotates and moves up and down, the movable plate 3463 drives the guide plate 3464 to move up and down, and the limiting slider 34651 can move stably in the vertical direction along the strip limiting groove 34652, thereby ensuring that the movable plate 3463 and the guide plate 3464 maintain a high degree of stability during the rotation and up and down movement.

[0076] Reference Figure 6 , Fig.13 and Fig.14 As shown, the end of the sliding column 34631 is provided with a ball 34632 that can slide with the cam groove 34633 provided in the first tube 34622, and the ball 34632 can be freely rotatably provided at the end of the sliding column 34631. When the sliding column 34631 moves along the cam groove 34633 provided in the first tube 34622, the contact surface with the cam groove 34633 is increased by the ball 34632, and at the same time, it is ensured that the sliding column 34631 can move more smoothly along the cam groove 34633.

[0077] Reference Figure 1 , Figure 2 and Figure 7As shown in the figure, the water supply connection structure 345 includes an extension plate 3452, a diverter pipe 3453, a fixed casing 3454 and a guide connection pipe 3455; the extension plate 3452 is arranged at an interval at one end of the rotating sleeve 343 away from the casing 3462; the diverter pipe 3453 is arranged vertically through the extension plate 3452, and the diverter pipe 3453 is connected to the second pipe 3451, the axis of the diverter pipe 3453 intersects with the axis of the rotating sleeve 343, and one end of each second pipe 3451 is respectively connected to the diverter pipe 3453. The upper end of the shunt pipe 3453 can be rotatably connected to the inside of the batching tank and extend upward a certain distance through the top of the batching tank; the fixed sleeve 3454 is arranged at the top center of the batching tank, and an inlet pipe 34541 extends upward from the center of the fixed sleeve 3454; one end of the third pipeline 331 is connected to the inlet pipe 34541; the guide connecting pipe 3455 on the shunt pipe 3453 extends to the inside of the water inlet pipe 34541; and a second waterproof bearing 3456 is arranged between the shunt pipe 3453 and the water inlet pipe 34541.

[0078] When the piston 3441 moves downward along the water extraction pipe 344, the water in the second water tank 33 flows sequentially through the third pipe 331, the water inlet pipe 34541, the guide connecting pipe 3455, the diverter pipe 3453, the second pipe 3451 and the water extraction pipe 344. When the rotating sleeve 343 starts to rotate, it will drive the extension plate 3452, the diverter pipe 3453, the second pipe 3451 and the guide connecting pipe 3455 to rotate together. Since the water inlet pipe 34541 is firmly fixed to the top of the mixing tank 34 through the fixed sleeve 3454, and the water inlet pipe 34541 and the guide connecting pipe 3455 are connected through the second waterproof bearing 3456, when the guide connecting pipe 3455 rotates, the water inlet pipe 34541 can remain stationary and will not rotate with it, which helps the water inlet pipe 34541 to supply water to each water extraction pipe 344 more stably and effectively.

[0079] Reference Figure 2 , Figure 5 and Figure 7 As shown, the second pipe 3451 is provided with a first one-way valve 34511, and the water pipe 3433 is provided with a second one-way valve 34332. When the piston 3441 moves downward along the water pumping pipe 344, the water in the second water tank 33 flows into the water pumping pipe 344 through the second pipe 3451. At this time, due to the action of the second one-way valve 34332 provided inside the water pumping pipe 344, negative pressure is generated in the water pumping pipe 344, so that the water in the second water tank 33 is more effectively pumped in. When the piston 3441 moves upward along the water pumping pipe 344, the first one-way valve 34511 provided inside the second pipe 3451 prevents the water from flowing back from the water pumping pipe 344 to the second pipe 3451; at this time, the water can only continue to flow into the water pipe 3433 through the second one-way valve 34332, so as to realize the function of gradually filling the water pipe 3433.

[0080] Reference Figure 8 As shown: multiple nozzles 34331 are tilted at a specific angle and staggered along the axis of the water pipe 3433. Two adjacent nozzles 34331 on the water pipe 3433 are arranged at an angle, and the water spraying port of each nozzle 34331 is tilted downward. When the nozzle 34331 sprays water, it can cover the paint area in the mixing tank more widely, ensuring that the water can be evenly sprayed on the paint surface, thereby promoting uniform mixing of the paint and water.

[0081] Reference Figure 2 , Fig. 9 , Fig.11 and Fig.12 As shown: one end of the stirring shaft 3431 on the rotating sleeve 343 is rotatably arranged on the outside of the rotating sleeve 343, and one end of the stirring shaft 3431 extends to the inside of the rotating sleeve 343, the stirring shaft 3431 and the rotating sleeve 343 are axially connected through a third waterproof bearing, and the end of the stirring shaft 3431 extending to the inside of the rotating sleeve 343 is connected to a worm gear 34311, and a worm 34312 meshing with the worm gear 34311 is provided below the worm gear 34311, and the worm 34312 is horizontally arranged, and a bracket is provided in the rotating sleeve 343, and both ends of the worm 34312 are rotatably arranged on the bracket, and a transmission structure 3432 that can drive the worm 34312 to rotate is provided on the top of the guide plate 3464.

[0082] When the guide plate 3464 moves up and down along the rotating sleeve 3462, the worm 34312 is driven to rotate through the transmission structure 3432. After the worm 34312 rotates, the worm wheel 34311 is driven to rotate through the meshing mechanism of the gear 34322. The worm wheel 34311 then drives the stirring shaft 3431 connected thereto to rotate. Therefore, during the rotation of the rotating sleeve 343, the stirring shaft 3431 can rotate synchronously, thereby achieving uniform mixing of water and paint.

[0083] Reference Figure 4 , Fig. 9 , Fig.11 and Fig.12 As shown, the transmission structure 3432 includes a rack 34321, which is vertically arranged on the top of the guide plate 3464, and the outer part of the worm 34312 is provided with a gear 34322 that can mesh with the rack 34321.

[0084] When the guide plate 3464 moves up and down, it will drive the rack 34321 connected to it to move accordingly. The movement of the rack 34321 drives the corresponding gear 34322 to rotate. The gear 34322 also drives the worm 34312 connected to it to rotate, so that the stirring shaft 3431 can achieve reciprocating rotation, further increasing the mixing efficiency of the paint and water.

[0085] Reference Figures 1 to 15 As shown: The present invention also provides a spraying method of a water-based paint spraying device for a steel structure, which is applied to a water-based paint spraying device for a steel structure, and comprises the following steps:

[0086] S1. Shot blast the steel structure by shot blasting unit 1 to remove rust, oil stains and impurities on the surface and improve the adhesion of the coating.

[0087] S2. Grind the edge of the steel structure by edge grinding unit 2 to remove sharp edges and burrs.

[0088] S3. The water-based paint is mixed with water by mixing unit 3. The water-based paint mixing ratio should be determined according to the actual situation on site. The water adding ratio is between 5% and 20%. The specific ratio should be adjusted according to the viscosity of the paint and the spraying method. For example, it may be necessary to add 20% when spraying, but only 10% when brushing.

[0089] S4. Spray the steel structure through the spray unit 4, which includes a paint supply system and a spray gun. The worker checks whether the spray gun and the paint supply system are working properly and adjusts the pressure and flow of the compressed air system. During the spraying process, the worker needs to keep the spray gun at a moderate distance from the surface of the steel structure, generally 40 to 60 cm, and move the spray gun at a uniform speed to ensure that the coating is uniform and without omissions. According to the customer's requirements for the thickness of the paint film, it is usually sprayed 1-2 times, and the oil output and air flow of the spray gun are adjusted to control the thickness of the coating.

[0090] S5. After the steel structure is sprayed, the water-based paint on the steel structure is air-dried. During the air-drying process, the temperature and humidity of the construction site should be controlled. The air-drying time is generally 2 to 3 hours. The specific time should be determined based on the type and thickness of the paint and the environmental conditions of the construction site.

[0091] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A water-based paint spraying device for a steel structure, comprising a shot blasting unit (1), an edge grinding unit (2), a mixing unit (3) and a spraying unit (4), characterized in that: The mixing unit (3) comprises a frame (31) and a first water tank (32), a second water tank (33) and a mixing tank (34) respectively arranged on the frame (31); The mixing tank (34) is vertically arranged on the frame (31), a feed pipe (341) is arranged at the upper end of the mixing tank (34), a discharge pipe (342) is arranged at the lower end of the mixing tank (34), and a feed pump (3421) is connected to the end of the discharge pipe (342); The first water tank (32) and the second water tank (33) are connected via a first pipe (321), and a water pump (322) is connected to the first pipe (321); A rotating sleeve (343) is provided inside the mixing tank (34) and rotates along its axis, and a driving mechanism (311) is provided on the frame (31) and drives the rotating sleeve (343) to rotate; A plurality of stirring shafts (3431) are disposed outside the lower end of the rotating sleeve (343), a plurality of water pipes (3433) are disposed along the radial direction of the upper end of the rotating sleeve (343), and a plurality of nozzles (34331) are distributed on the water pipes (3433) along the axis thereof; A plurality of water pumping pipes (344) connected to the water pipe (3433) are arranged inside the rotating sleeve (343); a water supply connection structure (345) is arranged on the top of the mixing tank (34); the water supply connection structure (345) is connected to each water pumping pipe (344) through a second pipe (3451); the second water tank (33) is connected to the water supply connection structure (345) through a third pipe (331); a piston (3441) is arranged inside the water pumping pipe (344); a reciprocating lifting mechanism (346) is arranged at the lower end of the rotating sleeve (343); the reciprocating lifting mechanism (346) comprises a lifting rod (3461) connected to each piston (3441) and is used to drive the piston (3441) to reciprocate along the water pumping pipe (344).

2. According to the water-based paint spraying device for a steel structure as described in claim 1, the reciprocating lifting mechanism (346) further includes a sleeve (3462) and a movable plate (3463); The lower end of the rotating sleeve (343) can rotate to penetrate the bottom of the mixing tank (34) and extend downward for a certain distance. The outside of the rotating sleeve (343) is axially connected to the bottom of the mixing tank (34) through a first waterproof bearing. The sleeve (3462) is arranged directly below the rotating sleeve (343). The sleeve (3462) is composed of a first tube body (34622) and a second tube body (34623). The second tube body (34623) is sleeved on the first tube body (34622). The second tube body (34623) is connected to the frame (31) through a connecting plate (34621). The movable plate (3463) is arranged inside the first tube body (34622) and can move up and down along the inside of the first tube body (34622). A guide plate (3464) is arranged on the top of the movable plate (3463) and can move along the internal axis of the rotating sleeve (343). The guide plate (3464) is movably connected to the inside of the rotating sleeve (343) through a limiting structure. The end of the lifting rod (3461) away from the piston (3441) is connected to the top of the guide plate (3464). The movable plate (3463) is provided with a sliding column (34631) along its own radial direction. The inner wall of the first tube body (34622) is provided with a cam groove (34633) for the sliding column (34631) to move.

3. The water-based paint spraying device for steel structure according to claim 2 is characterized in that: The limiting structure comprises a limiting slider (34651), which is radially arranged on the guide plate (3464) along the guide plate (3464), and a strip-shaped limiting groove (34652) is arranged inside the rotating sleeve (343) for the limiting slider (34651) to move along the axis of the rotating sleeve (343).

4. The water-based paint spraying device for steel structure according to claim 1, characterized in that: The end of the sliding column (34631) is provided with a ball (34632) that can slide with the cam groove (34633) opened in the first tube (34622), and the ball (34632) is freely rotatably arranged at the end of the sliding column (34631).

5. The water-based paint spraying device for steel structure according to claim 2 is characterized in that: The water supply connection structure (345) includes an extension plate (3452), a diversion pipe (3453), a fixed casing (3454) and a guide connection pipe (3455); The extension plate (3452) is spaced apart and arranged at one end of the rotating sleeve (343) away from the sleeve (3462); The shunt pipe (3453) is vertically penetrated on the extension plate (3452), and the shunt pipe (3453) is connected to the second pipe (3451), the axis of the shunt pipe (3453) intersects with the axis of the rotating sleeve (343), one end of each second pipe (3451) is respectively connected to the inside of the shunt pipe (3453), and the upper end of the shunt pipe (3453) can be rotated to penetrate the top of the batching tank; The fixed casing (3454) is arranged at the top center of the batching tank, and a water inlet pipe (34541) extends upward from the center of the fixed casing (3454). One end of the third pipeline (331) is connected to the water inlet pipe (34541), and an extended end of the diverter pipe (3453) extends to the inside of the water inlet pipe (34541). A second waterproof bearing (3456) is arranged between the diverter pipe (3453) and the water inlet pipe (34541).

6. The water-based paint spraying device for steel structure according to claim 1, characterized in that: A first one-way valve (34511) is disposed inside the second pipeline (3451), and a second one-way valve (34332) is disposed inside the water pipe (3433).

7. The water-based paint spraying device for steel structure according to claim 1 is characterized in that: The plurality of nozzles (34331) are inclined and staggered along the axis of the water pipe (3433).

8. The water-based paint spraying device for steel structure according to claim 2, characterized in that: One end of the stirring shaft (3431) on the rotating sleeve (343) is rotatably arranged outside the rotating sleeve (343), and one end of the stirring shaft (3431) extends into the interior of the rotating sleeve (343). The stirring shaft (3431) and the rotating sleeve (343) are axially connected via a third waterproof bearing. One end of the stirring shaft (3431) extending into the interior of the rotating sleeve (343) is connected to a worm gear (34311). A worm (34312) meshing with the worm gear (34311) is provided below the worm gear (34311). The worm gear (34312) is horizontally arranged. A bracket is provided inside the rotating sleeve (343). Two ends of the worm gear (34312) are rotatably arranged on the bracket respectively. A transmission structure (3432) capable of driving the worm gear (34312) to rotate is provided on the top of the guide plate (3464).

9. The water-based paint spraying device for steel structure according to claim 8, characterized in that: The transmission structure (3432) includes a rack (34321) which is vertically arranged on the top of the guide plate (3464), and a gear (34322) which can mesh with the rack (34321) is sleeved on the outside of the worm (34312).

10. A method for spraying a water-based paint spraying device for a steel structure, applied to a water-based paint spraying device for a steel structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Shot blasting the steel structure by shot blasting unit (1) to remove rust, oil and impurities on the surface and improve the adhesion of the coating; S2. Grinding the edge of the steel structure by the edge grinding unit (2) to remove sharp edges and burrs; S3. The water-based paint is mixed with water by the mixing unit (3), and the water-based paint is mixed with water at a ratio of 5% to 20%; the specific ratio should be adjusted according to the viscosity of the paint and the spraying method; S4. The steel structure is sprayed by a spray unit (4), the spray unit (4) includes a paint supply system and a spray gun. During the spraying process, the spray gun is moved at a uniform speed to ensure that the coating is uniform and without omissions; spray 1-2 times, and adjust the oil output and air flow of the spray gun to control the thickness of the coating; S5. After the steel structure is sprayed, the water-based paint on the steel structure is air-dried. During the air-drying process, the temperature and humidity of the construction site should be controlled. The air-drying time is generally 2 to 3 hours. The specific time should be determined based on the type and thickness of the paint and the environmental conditions of the construction site.

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