CN116140108A - Surface paint spraying device of steel structure - Google Patents

Abstract

The invention relates to the technical field of spraying devices, in particular to a surface paint spraying device of a steel structure, which comprises a bracket, a clamp, a spraying mechanism, a travelling mechanism and a driving mechanism, wherein the bracket is arranged on the bracket; the spraying mechanism comprises a spray gun, a first travelling frame, a pressurizing pump and a paint storage cylinder; according to the invention, the travelling mechanism drives the spraying mechanism to automatically travel along the workpiece from front to back, the paint in the paint storage cylinder is pumped into the spray guns by the pressurizing pump, and two spray guns positioned on two sides of the workpiece simultaneously spray the workpiece, so that the spraying efficiency is improved. Further, through setting up clearance subassembly and stirring subassembly, clear away the rust on work piece surface before the spraying, avoid the paint in the spray gun to take place to solidify the caking in the spraying process to guaranteed the normal clear of spraying work and to the spraying effect of work piece. Further, the curved workpiece can be sprayed, and the spraying amount can be adjusted according to the bending degree of the curved workpiece, so that the uniformity and consistency of spraying different arc surfaces are ensured.

Description

A surface paint spraying device for steel structures

technical field

The invention relates to the technical field of spraying devices, in particular to a surface paint spraying device for steel structures.

Background technique

Spraying operation is a very important link in the manufacturing industry. Spraying is a method of spraying paint on the workpiece after spraying tools such as spray guns to atomize the paint. Since most steel structures need to be in contact with the outside world, before use It needs to be sprayed for anti-rust treatment; while the traditional spraying method requires manual hand-held spray guns to spray the workpiece, which is labor-intensive, and there will be problems of uneven spraying.

The Chinese patent with publication number CN113019776A discloses a surface paint coating spraying device for high-rise steel structures. It can move on the surface of the spraying device, which improves the applicability of the spraying device, but in the process of spraying, this invention still needs manual participation in more operations, the automation of the spraying work is low, and it will endanger the health of workers.

Contents of the invention

The invention provides a steel structure surface paint spraying device to solve the problem of low automation of the spraying work existing in the existing spraying transposition.

A surface paint spraying device for a steel structure of the present invention adopts the following technical scheme: a surface paint spraying device for a steel structure, comprising:

A bracket, including a support plate arranged along the front and rear directions;

a fixture configured to hold the workpiece on the support plate;

The spraying mechanism includes two spray guns, two first walking frames, a booster pump and a paint storage tank; the spray guns are tubular, and the two spray guns are respectively located on both sides of the workpiece, and the side of the spray gun facing the workpiece is provided with multiple injection ports. The two injection ports are evenly distributed along the length direction of the spray gun; the spray gun is provided with a paint inlet, which is connected with the pressure pump and the paint storage tank in turn; two first walking frames are respectively arranged at both ends of the spray gun, and the two The ends are respectively connected with the two first walking frames;

Two traveling mechanisms are respectively arranged on the two first walking frames; the traveling mechanism includes a driving wheel and a driven wheel; the driving wheel and the driven wheel are respectively located on both sides of the workpiece and are driven by friction with the workpiece; the driving wheel and the driven wheel are hinged on the first walking frame;

The driving mechanism is connected with one of the driving wheels to drive the driving wheel to rotate, thereby driving the two spray guns to move from front to back through the first walking frame.

Further, the traveling mechanism also includes a second walking frame, a walking plate, two follower wheels, and two return springs; the upper and lower second walking frames are connected by two limit posts, and the two limit posts are respectively located on the workpiece. On both sides of the two sides, the limit column is set parallel to the spray gun; the second walking frame is set behind the first walking frame; the two follower wheels are respectively coaxially set with the two limit columns; The moving wheels can be rotatably connected to the second walking frame; the walking plate is located on one side of the workpiece, and the two ends of the walking plate are respectively hinged with the first walking frame and the second walking frame; the other side of the workpiece is provided with a distance sensor, and the distance sensor Scalable setting, and there is always a tendency of elongation; the two ends of the distance sensor are respectively hinged with the first walking frame and the second walking frame; a controller is provided on the booster pump; when the length of the distance sensor changes, the controller After a preset period of time, change the paint feed pressure of the spray gun on the same side as the distance sensor; the longer the distance sensor, the greater the paint feed pressure of the spray gun on the same side as the distance sensor; one end of the two return springs is in line with the travel The other ends are respectively connected to the first walking frame and the second walking frame.

Further, a surface paint spraying device for steel structures also includes a cleaning assembly, which includes two cleaning rollers and multiple cleaning transmission assemblies; The shaft is arranged; the cleaning roller is located at the rear side of the spray gun; the cleaning roller and the follower wheel are connected by a cleaning transmission assembly, and when the follower wheel rotates, the cleaning transmission assembly drives the cleaning roller to rotate synchronously.

Further, the cleaning transmission assembly includes a transmission wheel and a reversing wheel; the transmission wheel is fixedly installed on the end of the cleaning roller, and the reversing wheel meshes with both the transmission wheel and the follower wheel.

Further, a steel structure surface paint spraying device also includes a stirring assembly, the stirring assembly includes two stirring rods and a stirring transmission assembly; the two stirring rods are respectively arranged in the two spray guns, and can rotate relative to the spray guns; when the spray gun is from the front When moving backward, the agitating transmission assembly is driven by the driving mechanism to make the agitating rod rotate in the spray gun.

Further, the support plate is arranged vertically, and the two spray guns are respectively located on the front and rear sides of the workpiece.

Further, the first walking frame and the second walking frame can be stretched along the front-to-back direction, and both of them include tension springs arranged along the front-to-back direction, and the tension springs in the first walking frame make the two spray guns close to each other or have such This tendency, the tension spring in the second walking frame makes the two cleaning rollers close to each other or has this tendency.

Further, the fixture includes two slides, multiple struts, multiple fixing bolts and multiple limit bolts; the two slides are slidably mounted on the support plate back and forth; the struts are arranged horizontally, and the struts can slide up and down Installed on the sliding frame, a plurality of fixing bolts are threadedly engaged with one end of the plurality of struts facing the workpiece respectively; the limit bolts are used to keep the struts at a vertical height.

The beneficial effects of the present invention are: by setting the walking mechanism, the spraying mechanism can automatically walk along the workpiece from front to back, which improves the automation of the spraying work, does not require too much manual operation, and improves the efficiency of the spraying work while ensuring the health of workers. Efficiency: The pressurized pump pumps the paint in the paint storage tank into the spray gun, and the two spray guns located on both sides of the workpiece spray the workpiece at the same time, further improving the spraying efficiency.

Further, by setting the cleaning assembly and the stirring assembly, when the driving mechanism drives the driving wheel to rotate, the cleaning transmission assembly drives the cleaning roller to remove impurities and rust on the surface of the workpiece; the stirring transmission assembly drives the stirring rod to rotate in the spray gun to avoid rust in the spray gun The paint solidifies and agglomerates, thus ensuring the normal progress of the spraying work and the spraying effect on the workpiece.

Further, the present invention can spray on curved workpieces; when the follower wheel contacts concave or convex surfaces with different radii, the length of the distance sensor changes, and then the controller adjusts the length according to the length of the distance sensor after a preset time length. The paint feed pressure of the spray gun located on the same side of the workpiece as the distance sensor changes the amount of sprayed paint; the invention can adaptively adjust the amount of sprayed paint according to the bending degree of the curved workpiece, ensuring the uniformity and consistency of spraying on different arc surfaces.

Further, by setting the support plate in a vertical state, and fixing the workpiece vertically on the support plate through the fixture; avoiding the influence of gravity on the surface paint spraying device of a steel structure, ensuring the movement of the traveling mechanism from front to back The speed ensures the efficiency of spraying work.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural representation of the embodiment of the surface paint spraying device of a kind of steel structure of the present invention;

Figure 2 is a partial enlarged view of A in Figure 1;

Fig. 3 is the structural representation of support;

Fig. 4 is the structural representation of spraying mechanism, running mechanism and cleaning assembly in the embodiment of the present invention;

Fig. 5 is a partial enlarged view of place B in Fig. 4;

Fig. 6 is the exploded structural view of Fig. 4;

Fig. 7 is a partial enlarged view at C in Fig. 6;

FIG. 8 is a partially enlarged view at D in FIG. 6 .

In the figure: 100, bracket; 110, support plate; 200, fixture; 210, carriage; 220, strut; 230, fixing bolt; 240, limit bolt; 300, workpiece; 400, spraying mechanism; 410, spray gun; 411, injection port; 412, paint inlet; 420, first walking frame; 430, booster pump; 440, paint storage tank; 450, distance sensor; 460, controller; 500, traveling mechanism; 510, driving wheel; 520, driven wheel; 530, second walking frame; 531, limit post; 540, walking plate; 550, follower wheel; 560, return spring; 600, driving mechanism; 700, cleaning assembly; 710, cleaning roller; 720, Clean up the transmission assembly; 721, the transmission wheel; 722, the reversing wheel; 800, the stirring assembly; 810, the stirring rod; 820, the stirring transmission assembly.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The accompanying drawings in the present invention are only used to show the specific structure and its connection relationship, which are only schematic, and do not represent the specific dimensions and the proportional relationship between the parts.

An embodiment of a surface paint spraying device for a steel structure of the present invention, as shown in FIGS. And drive mechanism 600; Support 100 comprises the support plate 110 that is arranged along front-back direction; Fixture 200 is configured to clamp workpiece 300 on support plate 110; Spraying mechanism 400 comprises two spray guns 410, two first walking frames 420, add Pressure pump 430 and paint storage cylinder 440; Spray gun 410 is tubular, and two spray guns 410 are respectively positioned at the both sides of workpiece 300, and spray gun 410 is provided with a plurality of injection ports 411 toward the one side of workpiece 300, and a plurality of injection ports 411 are arranged along the spray gun 410. The length direction is evenly distributed; the spray gun 410 is provided with a paint inlet 412, and the booster pump 430 is provided with an output port. Connected by hoses; two first walking frames 420 are respectively arranged at both ends of the spray gun 410, and the two ends of the spray gun 410 are respectively connected with the two first walking frames 420; two traveling mechanisms 500 are respectively arranged at the two first walking frames Frame 420; traveling mechanism 500 comprises driving wheel 510 and driven wheel 520; driving wheel 510 and driven wheel 520 are respectively located at the both sides of workpiece 300 and friction transmission with workpiece 300; driving wheel 510 and driven wheel 520 are hinged on the first traveling frame 420 The driving mechanism 600 is a driving motor, and the driving motor drives one of the driving wheels 510 to rotate through the belt, so that the first walking frame 420 drives the two spray guns 410 to move from front to back.

In this embodiment, the traveling mechanism 500 also includes a second walking frame 530, a walking plate 540, two follower wheels 550 and two return springs 560; two limit columns are arranged between the upper and lower second walking frames 530 531; two limit columns 531 are respectively located on both sides of the workpiece 300, and the limit columns 531 are arranged in parallel with the spray gun 410; the upper and lower two second walking frames 530 are connected by two limit columns 531; the second walking frame 530 is arranged on the rear of the first walking frame 420;

The two follower wheels 550 are arranged coaxially with the two limit columns 531 respectively; the follower wheels 550 and the workpiece 300 are frictionally driven; the two follower wheels 550 are rotatably connected to the second walking frame 530;

The walking plate 540 is located on one side of the workpiece 300, and the two ends of the walking plate 540 are respectively hinged with the first walking frame 420 and the second walking frame 530;

The other side of workpiece 300 is provided with distance sensor 450, and distance sensor 450 is telescopically arranged, and has the tendency of elongation all the time; The two ends of distance sensor 450 are respectively hinged with first walking frame 420 and second walking frame 530; The pump 430 is provided with a controller 460; when the length of the distance sensor 450 changes, the controller 460 changes the paint feed pressure of the spray gun 410 located on the same side of the workpiece 300 as the distance sensor 450 after a preset period of time; the longer the distance sensor 450 , the paint inlet pressure of the spray gun 410 located on the same side of the workpiece 300 as the distance sensor 450 is greater;

One ends of the two return springs 560 are connected to the running plate 540 , and the other ends are respectively connected to the first walking frame 420 and the second walking frame 530 . When the radius of the workpiece 300 increases, the angle between the walking plate 540 and the second walking frame 530, and the angle between the walking plate 540 and the first walking frame 420 will change. During this process, the return spring 560 accumulates force ; When the radius of the workpiece 300 decreases, the return spring 560 releases energy, so that the first walking frame 420, the second walking frame 530, the walking plate 540 and the distance sensor 450 return to the initial state.

When the follower wheel 550 on the same side as the distance sensor 450 was in contact with the concave surface, the distance sensor 450 was pushed by the concave surface. Because the length of the walking plate 540 was constant, the thickness of the workpiece 300 was constant, and the length of the distance sensor 450 was shortened. The angle between the walking plates 540 decreases, and the return spring 560 accumulates force; the shorter the length of the distance sensor 450, the smaller the radius of the concave surface, the smaller the area of the concave surface, the smaller the amount of paint required, and the required paint intake. less pressure;

When the follower wheel 550 on the same side as the distance sensor 450 was in contact with the convex surface, the distance sensor 450 would elongate, the angle between the second walking frame 530 and the walking plate 540 would increase, and the back-moving spring 560 would store power; Longer, indicating that the larger the radius of the convex surface, the larger the area of the convex surface, the more paint required, and the greater the paint inlet pressure required;

The controller 460 adjusts the paint feed pressure of the spray gun 410 located on the same side of the workpiece 300 as the distance sensor 450 according to the change of the length of the distance sensor 450, thereby changing the amount of spray paint; When spraying, it can ensure the uniformity and consistency of spraying on different arc surfaces.

In this embodiment, a cleaning assembly 700 is also included, and the cleaning assembly 700 includes two cleaning rollers 710 and a plurality of cleaning transmission assemblies 720; Coaxial arrangement; the cleaning roller 710 is positioned at the rear side of the spray gun 410; the cleaning roller 710 and the follower wheel 550 are connected by a cleaning transmission assembly 720, and when the follower wheel 550 rotates, the cleaning transmission assembly 720 drives the cleaning roller 710 to rotate synchronously. The cleaning roller 710 is in contact with the surface of the workpiece 300. When the cleaning roller 710 rotates, the rust and impurities on the surface of the workpiece 300 are scraped and cleaned, so as to avoid affecting the service life of the steel structure due to the existence of the rust.

In this embodiment, the cleaning transmission assembly 720 includes a transmission wheel 721 and a reversing wheel 722 ; When the follower wheel 550 rotates, the driving wheel 721 and the reversing wheel 722 drive the cleaning roller 710 to rotate around the limit post 531, and the rotation direction of the cleaning roller 710 is opposite to that of the follower wheel 550; The reversing function of the cleaning transmission assembly 720 prevents the cleaned impurities from adhering to the freshly sprayed paint surface and affecting the spraying effect.

In the present embodiment, a stirring assembly 800 is also included, and the stirring assembly 800 includes two stirring rods 810 and a stirring transmission assembly 820; the two stirring rods 810 are respectively arranged in the two spray guns 410, and can rotate relative to the spray guns 410; when the spray guns When 410 moves from front to back, the stirring transmission assembly 820 is driven by the driving mechanism 600 to make the stirring rod 810 rotate in the spray gun 410 . Avoid paint solidification and agglomeration inside the spray gun 410 .

In this embodiment, the support plate 110 is vertically arranged, and the two spray guns 410 are respectively located on the front and rear sides of the workpiece 300 . By setting the support plate 110 in a vertical state, and fixing the workpiece 300 on the support plate 110 through the clamp 200; avoiding the phenomenon that the surface paint spraying device of a steel structure is affected by gravity, and the walking wheel slips, ensuring walking The speed at which the mechanism 500 moves from front to back ensures the efficiency of spraying work.

In this embodiment, both the first walking frame 420 and the second walking frame 530 include a telescopic plate and a telescopic rod; the telescopic rod and the telescopic plate are arranged along the thickness direction of the workpiece 300, and both of them are provided with tension springs along the front and rear directions. , the tension spring makes the expansion rod and the expansion plate have a tendency to shorten all the time; the two ends of the expansion plate are respectively hinged with the walking plate and the distance sensor 450; the bottom of the two ends of the expansion plate is vertically provided with a mounting column; The installation columns at both ends of the expansion plate are connected; the driving wheel 510 and the driven wheel 520 are respectively set on the two installation columns below the first walking frame 420; the two follower wheels 550 are respectively set on the two installation columns below the second walking frame 530 Above; the first walking frame 420 also includes two extension boards arranged in line with the telescopic board; the two extension boards are respectively arranged at both ends of the telescopic board; the extension board includes a connecting end and a mounting end; the connecting end is sleeved on the mounting column , the spray gun 410 is connected to the installation end.

In this embodiment, the fixture 200 includes two sliding frames 210, a plurality of struts 220, a plurality of fixing bolts 230 and a plurality of limit bolts 240; 210 can slide back and forth and be installed in the limit groove; Slider 210 is vertically provided with chute; Strut 220 is horizontally arranged, and Strut 220 can slide up and down and is installed in the chute, and a plurality of fixing bolts 230 are respectively connected with a plurality of One end of a strut 220 facing the workpiece 300 is screwed together; the limit bolt 240 is used to keep the strut 220 at a vertical height. Before the spraying work starts, the workpiece 300 is placed vertically, the first traveling frame 420 and the second traveling frame 530 are pulled apart, and the workpiece 300 is passed between the two spray guns 410 and the two cleaning rollers 710, according to the workpiece 300 Adjust the distance between the two carriages 210 and the vertical position of the struts 220, limit the vertical height of the struts 220 by the limit bolts 240, and fix the workpiece 300 to multiple struts by the fixing bolts 230 220 on.

In conjunction with the above-mentioned embodiments, the use principle and working process of the present invention are as follows: the workpiece 300 is placed vertically, the first walking frame 420 and the second walking frame 530 are pulled apart, and the workpiece 300 is sprayed from the two spray guns 410 and the two cleaning rollers. 710, adjust the distance between the two carriages 210 according to the size of the workpiece 300, and the vertical position of the strut 220, limit the vertical height of the strut 220 by the limit bolt 240, and pass the fixing bolt 230 The workpiece 300 is fixed on the plurality of support rods 220, and the preparatory work is completed.

Start the booster pump 430, the controller 460 and the driving mechanism 600; the booster pump 430 pumps the paint in the paint storage tank 440 into the spray gun 410 through the hose and the paint inlet 412 in turn; the spray gun 410 sprays the paint from the injection port 411 to the surface of the workpiece 300; the driving mechanism 600 drives the driving wheel 510 to rotate, and when the driving wheel 510 rotates, the first walking frame 420 drives the driven wheel 520 to rotate, and then drives the two spray guns 410 to move from front to back. When the spray gun 410 moves backward, The first walking frame 420 pushes the second walking frame 530 to move backward through the walking plate 540, and the friction between the workpiece 300 and the follower wheel 550 drives the follower wheel 550 to rotate, and then drives the cleaning roller 710 through the transmission wheel 721 and the reversing wheel 722 Rotate around the limit post 531, and the rotation direction of the cleaning roller 710 is opposite to that of the follower wheel 550; the driving mechanism 600 drives the stirring assembly 800 to start stirring. After starting the driving mechanism 600 , the cleaning component 700 first scrapes and cleans the impurities and rust on the surface of the workpiece 300 , and then the spray gun 410 sprays paint on the surface of the workpiece 300 . Because the direction of rotation of the cleaning roller 710 is opposite to that of the follower wheel 550, the cleaned-up impurities move to the rear of the workpiece 300. By cleaning the reversing function of the transmission assembly 720, the cleaned-up impurities are prevented from adhering to the paint surface just sprayed. affect the spraying effect. During the spraying process of the spray gun 410 , the rotation of the stirring rod 810 is driven by the stirring transmission assembly 820 , so as to prevent the paint inside the spray gun 410 from solidifying and agglomerating.

When spraying the curved workpiece 300, the curved workpiece 300 has a concave surface and a convex surface. Since the thickness of the workpiece 300 is constant, under the premise of the same length, the area of the convex surface is larger than the area of the concave surface, and the smaller the radius, the greater the difference between the concave surface and the convex surface. The larger the area difference.

When the follower wheel 550 on the same side as the distance sensor 450 is in contact with the concave surface, the distance sensor 450 is pushed by the concave surface. Since the length of the walking plate 540 is constant and the thickness of the workpiece 300 is constant, when the distance sensor 450 is pushed by the concave surface workpiece 300 , the length of the distance sensor 450 is shortened, the angle between the second walking frame 530 and the walking plate 540 is reduced, and the return spring 560 is charged; The paint feed pressure of the spray gun 410 on the same side; the shorter the distance from the sensor 450, the smaller the radius of the concave surface, the more the area of the concave surface shrinks, the smaller the amount of paint required, and the smaller the required paint feed pressure;

When the follower wheel 550 on the same side as the distance sensor 450 is in contact with the convex surface, the distance sensor 450 will elongate, the angle between the second walking frame 530 and the walking plate 540 will increase, and the return spring 560 will store force; The controller 460 increases the paint feed pressure of the spray gun 410 located on the same side of the workpiece 300 as the distance sensor 450 according to a preset formula; the longer the distance sensor 450, the larger the radius of the convex surface and the larger the area of the convex surface. The more the amount of paint, the greater the required pressure into the paint;

The controller 460 adjusts the paint feed pressure of the spray gun 410 located on the same side of the workpiece 300 as the distance sensor 450 after a preset period of time according to the change of the length of the distance sensor 450, thereby changing the amount of spray paint; so that the spray gun 410 is spraying the curved workpiece 300 When spraying, it can ensure the uniformity and consistency of spraying on different arc surfaces.

When the radius of the workpiece 300 decreases, the return spring 560 releases energy, so that the first traveling frame 420 , the second traveling frame 530 , the traveling plate 540 and the distance sensor 450 return to the initial state. Until the traveling mechanism 500 moves to the rearmost end of the workpiece 300 , the spraying work of the workpiece 300 by the spraying mechanism 400 ends.

By setting the support plate 110 to a vertical state, and fixing the workpiece 300 on the support plate 110 by the clamp 200; avoiding the surface paint spraying device of a steel structure from being affected by gravity, ensuring that the traveling mechanism 500 moves from front to back The speed ensures the efficiency of spraying work.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (8)

1. A surface paint spraying apparatus for a steel structure, comprising:

a bracket including a support plate disposed in a front-rear direction;

a clamp configured to clamp a workpiece on the support plate;

the spraying mechanism comprises two spray guns, two first travelling frames, a pressurizing pump and a paint storage cylinder; the spray guns are tubular, the two spray guns are respectively positioned at two sides of the workpiece, one surface of the spray gun facing the workpiece is provided with a plurality of spray openings, and the plurality of spray openings are uniformly distributed along the length direction of the spray gun; the spray gun is provided with a paint inlet which is sequentially connected with the booster pump and the paint storage cylinder; the two first travelling frames are respectively arranged at two ends of the spray gun, and the two ends of the spray gun are respectively connected with the two first travelling frames;

the two travelling mechanisms are respectively arranged on the two first travelling frames; the travelling mechanism comprises a driving wheel and a driven wheel; the driving wheel and the driven wheel are respectively positioned at two sides of the workpiece and are in friction transmission with the workpiece; the driving wheel and the driven wheel are hinged to the first travelling frame;

the driving mechanism is connected with one of the driving wheels to drive the driving wheel to rotate, so that the first walking frame drives the two spray guns to move from front to back.

2. The steel structure surface paint spraying apparatus of claim 1 wherein: the travelling mechanism further comprises a second travelling frame, a travelling plate, two follower wheels and two reset springs; two limit posts are arranged between the upper and lower second walking frames; the two limiting columns are respectively positioned at two sides of the workpiece, and the limiting columns are arranged in parallel with the spray gun; the upper and lower second walking frames are connected through two limit posts; the second walking frame is arranged behind the first walking frame;

the two follower wheels are coaxially arranged with the two limit posts respectively; the follower wheel is in friction transmission with the workpiece; the two follower wheels are rotatably connected to the second walking frame;

the walking plate is positioned on one side of the workpiece, and two ends of the walking plate are respectively hinged with the first walking frame and the second walking frame;

the other side of the workpiece is provided with a distance sensor which can be arranged in a telescopic way and always has a trend of elongation; two ends of the distance sensor are respectively hinged with the first walking frame and the second walking frame; a controller is arranged on the pressurizing pump; when the length of the distance sensor is changed, the controller changes the paint feeding pressure of the spray gun which is positioned on the same side of the workpiece as the distance sensor after the preset time length; the longer the distance sensor is, the larger the paint inlet pressure of the spray gun which is positioned on the same side of the workpiece with the distance sensor is;

one end of each of the two return springs is connected with the walking plate, and the other end of each of the two return springs is connected with the first walking frame and the second walking frame respectively.

3. The steel structure surface paint spraying apparatus as claimed in claim 2, wherein: the cleaning assembly comprises two cleaning rollers and a plurality of cleaning transmission assemblies; the two cleaning rollers are respectively positioned at two sides of the workpiece and are coaxially arranged with the follow-up wheels at the same side; the cleaning roller is positioned at the rear side of the spray gun; the cleaning roller is connected with the follower through a cleaning transmission assembly, and when the follower rotates, the cleaning transmission assembly drives the cleaning roller to synchronously rotate.

4. A steel structure surface paint spraying apparatus as claimed in claim 3 wherein: the cleaning transmission assembly comprises a transmission wheel and a reversing wheel; the driving wheel is fixedly arranged at the end part of the cleaning roller, and the reversing wheel is meshed with the driving wheel and the follower wheel.

5. The steel structure surface paint spraying apparatus of claim 4 wherein: the stirring assembly comprises two stirring rods and a stirring transmission assembly; the two stirring rods are respectively arranged in the two spray guns,

and can rotate relative to the spray gun; when the spray gun moves from front to back, the stirring transmission assembly is driven by the driving mechanism to enable the stirring rod to rotate in the spray gun.

6. A steel structure surface paint spraying apparatus as claimed in any one of claims 2 to 5 wherein: the backup pad is vertical to be set up, and two spray guns are located the front and back both sides of work piece respectively.

7. The steel structure surface paint spraying apparatus of claim 6 wherein: the first walking frame and the second walking frame can stretch out and draw back along the front-back direction, and both include the extension spring that sets up along the front-back direction, and the extension spring in the first walking frame makes two spray guns be close to each other or has such trend, and the extension spring in the second walking frame makes two cleaning rollers be close to each other or has such trend.

8. The steel structure surface paint spraying apparatus of claim 6 wherein: the fixture comprises two sliding carriages, a plurality of stay bars, a plurality of fixing bolts and a plurality of limit bolts; the two sliding carriages are arranged on the supporting plate in a front-back sliding way; the support rods are horizontally arranged and can be installed on the sliding frame in an up-down sliding mode, and the fixing bolts are respectively in threaded fit with one ends of the support rods, facing the workpiece; the limit bolts are used for keeping the stay bars at a vertical height.

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