Building exterior wall spraying device and method thereof

Abstract

The application discloses a building outer wall spraying device and a method thereof. The spraying device comprises a suspension frame hung on the outer side of a wall body. The suspension frame comprises a bottom plate and side plates. A reciprocating screw rod is rotatably connected between the side plates. A threaded sleeve is arranged on the reciprocating screw rod. An installation plate is fixedly connected to the threaded sleeve. A paint nozzle is arranged on the installation plate. An air suction duct is installed on the bottom plate. An air extractor is arranged in the air suction duct. The air extractor is used to suck the inner cavity of the air suction duct close to the wall body surface to negative pressure so that the end of the air suction duct is attached to the wall body surface. The air pressure of the air suction duct is used to suck and adsorb the spraying device on the wall body surface, so that the stability of the spraying device is maintained. The reciprocating screw rod is rotated to drive the paint nozzle to move back and forth along the reciprocating screw rod to spray the wall body surface, so that the spraying effect is improved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and specifically to a building exterior wall spraying device and method. Background Technology

[0002] Exterior wall spraying is a type of building exterior wall engineering. It involves spraying a layer of paint onto the exterior wall surface. This paint prevents rainwater, dew, and water vapor from penetrating the building structure, thus achieving waterproofing and moisture protection. Furthermore, it improves the color and aesthetics of the building's exterior, offering a rich variety of colors and styles to decorate the building's appearance, enhance its beauty, extend its lifespan, and reduce maintenance and repair costs.

[0003] Currently, exterior wall spraying is done manually by operators in suspended baskets, which is inefficient. To improve efficiency, automated spraying devices have emerged, which automatically spray exterior walls, reducing labor intensity and increasing efficiency.

[0004] For example, Chinese Patent Publication No. CN108118870A discloses an automatic coating spraying mechanism for building exterior walls, which includes: an L-shaped platform with four steering wheels at the bottom for easy movement; two suction cups at the front for attaching to the wall during operation; a guide rail at the top for sliding a multi-joint robotic arm and a coating tank integrated with a counterweight to move left and right; a nozzle at the end of the multi-joint robotic arm with a vision sensor at the top to automatically detect whether there is a wall in front after operation is started; a pipe opening above the nozzle for connecting the pipe to the coating tank; two motors at the rear of the platform connected to a reducer for driving a coaxial winch; and a crane connected to the platform via a cable. The crane has four steering wheels at the bottom for easy movement and an imbalance locking device at the top. It is capable of effectively spraying building exterior walls.

[0005] The existing technologies described above have the following drawbacks: such spraying devices cannot effectively maintain the spraying distance and there is shaking during the movement, which makes it impossible to maintain uniform spraying and brings uncontrollable risks to the stability of spraying. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems and provide a building exterior wall spraying device and method.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] An exterior wall spraying device includes a suspension frame suspended from the outside of a wall. The suspension frame includes a base plate and side plates fixed to both sides of the base plate. A reciprocating screw is rotatably connected between the side plates. A drive motor is fixedly mounted on one side plate, and the output shaft of the drive motor is driven by the reciprocating screw to drive the reciprocating screw to rotate. A threaded sleeve is provided on the reciprocating screw, and a mounting plate is fixedly connected to the threaded sleeve. A paint nozzle facing the wall surface is provided on the mounting plate. A guide rod is fixedly connected to the mounting plate, and the guide rod is arranged parallel to the reciprocating screw. A guide block is fixedly connected to the bottom of the mounting plate, and the guide block is slidably connected to the guide rod to slide along the axial direction of the guide rod. An air suction duct is installed on the base plate, and the air suction duct is located below the paint nozzle. The air suction end of the air suction duct faces the wall surface. An exhaust fan is installed in the air suction duct. The exhaust fan is used to draw the inner cavity of the air suction duct near the wall surface into negative pressure so that the end of the air suction duct is attached to the wall surface.

[0009] Furthermore, the air intake duct includes an air intake opening section, a first straight cylindrical section, a filter section, and a second straight cylindrical section connected in sequence. The air intake opening section is shaped like a trumpet in the horizontal direction. The filter section is equipped with a filter screen, which has a frustum-shaped structure. The second straight cylindrical section is located on the side of the filter section away from the first straight cylindrical section, and an exhaust fan is installed inside the second straight cylindrical section. The exhaust fan includes an air intake motor installed inside the second straight cylindrical section. An air intake fan blade is fixedly connected to the output shaft of the air intake motor. The air intake motor drives the air intake fan blade to rotate, causing air in the air intake duct near the wall to be drawn away from the wall.

[0010] Furthermore, bristles are fixedly connected to the periphery of the end face of the air intake section, and the ends of the bristles abut against the wall surface.

[0011] Furthermore, a first rotating shaft is rotatably connected to the inner wall of the air intake section. The first rotating shaft is horizontally arranged, and a grinding cylinder is fixedly connected to the first rotating shaft. The grinding cylinder abuts against the wall surface to grind the wall surface. The output shaft of the air intake motor is fixedly connected to a second rotating shaft. The end of the second rotating shaft extends to one side of the first rotating shaft and is fixedly connected to a worm gear. A turbine is fixedly connected to the first rotating shaft. The worm gear and the turbine gear mesh to form a worm gear transmission. The air intake motor drives the air intake fan blades to rotate and draw in air while simultaneously driving the second rotating shaft to rotate and drive the grinding cylinder to grind the wall surface.

[0012] Furthermore, grooves are provided on the inner walls of both sides of the air intake opening section, and sliders are slidably connected in the grooves. The two ends of the first rotating shaft are rotatably connected to the sliders. A compression spring is provided on the side of the slider away from the wall. One end of the compression spring abuts against the slider, and the other end of the compression spring abuts against the end of the groove.

[0013] Furthermore, a storage tank for storing paint is fixedly connected to the lower center of the base plate. A paint pump is installed on the storage tank, and the outlet of the paint pump is connected to a paint nozzle through a pipeline to pump the paint into the paint nozzle for spraying.

[0014] Furthermore, a receiving box is provided at the upper end of the air intake section. The receiving box is located below the nozzle, and the bottom of the receiving box is connected to the storage tank through a pipe. The receiving box is used to collect the paint overflowing from the paint nozzle. A receiving plate is hinged in the receiving box. The receiving plate is inclined, and the side of the receiving plate away from the receiving box is attached to the wall surface. A first tension spring is provided at the bottom of the receiving plate. One end of the first tension spring is fixedly connected to the receiving plate, and the other end of the first tension spring is fixedly connected to the upper surface of the air intake section.

[0015] Furthermore, a rack is fixedly connected to one side of the guide rod, and a third rotating shaft is rotatably connected to the mounting plate. The third rotating shaft is vertically arranged and its lower end passes through the mounting plate and is fixedly connected to a first gear. The first gear and the rack mesh to form a gear and rack transmission. A turntable is fixedly connected to the upper end of the third rotating shaft, and a drive shaft is fixedly connected to an eccentric position on the turntable. A mounting base is rotatably connected to the mounting plate, and the paint nozzle is fixedly connected to the mounting base. A drive block is fixedly connected to the bottom of the mounting base, and a drive groove is provided on the drive block. The drive groove is elongated, and the drive shaft passes through the drive groove to drive the drive block to swing.

[0016] Furthermore, a fixing plate is fixedly connected to the side of the suspension frame closest to the wall, and rollers are rotatably connected to the fixing plate.

[0017] Furthermore, the side plate is provided with a suspension rope for suspending.

[0018] The present invention also provides a spraying method for a building exterior wall spraying device, applied to the aforementioned building exterior wall spraying device, comprising the following steps:

[0019] 1. Suspend the spraying device on the outside of the wall using ropes;

[0020] 2. Turn on the exhaust fan. The suction duct generates negative pressure, which keeps the spraying device in contact with the wall surface.

[0021] 3. Start the paint pump to deliver paint, and spray the paint onto the wall surface through the paint nozzle;

[0022] 4. The drive motor drives the reciprocating screw to rotate, which in turn drives the paint nozzle to move back and forth to spray paint on the wall surface. The spraying device moves from top to bottom by lowering the rope, thereby spraying paint on the wall surface from top to bottom.

[0023] The present invention provides a building exterior wall spraying device and method, which has the following beneficial effects: the exhaust fan draws air into the suction duct to create negative pressure, causing the air pressure to adhere the spraying device to the wall surface, thereby maintaining the stability of the entire spraying device and preventing the spraying device from shaking and causing uneven spraying; the reciprocating screw drives the paint nozzle to move back and forth along the reciprocating screw to spray the wall surface, improving the spraying effect and making the spraying more uniform; the grinding cylinder and the suction fan blades rotate synchronously, so that while the grinding cylinder grinds the wall surface, the suction fan blades draw in air to collect dust in a timely manner. Attached Figure Description

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a building exterior wall spraying device provided by the present invention;

[0026] Figure 2 This is a top view schematic diagram of a building exterior wall spraying device provided by the present invention;

[0027] Figure 3 for Figure 1 Schematic diagram of a partial structure at part A in the middle;

[0028] Figure 4 for Figure 3 A top view of the components that mate at the turntable;

[0029] Figure 5 for Figure 1 Schematic diagram of a local structure in the middle;

[0030] Figure 6 This is a partial structural diagram of the mating component at the groove in this invention.

[0031] Explanation of the numbers in the diagram: 1. Suspension frame; 11. Base plate; 12. Side plate; 13. Drive motor; 14. Guide rod; 15. Rack; 16. Fixing plate; 17. Roller; 18. Suspension rope; 2. Reciprocating screw; 21. Threaded sleeve; 3. Mounting plate; 31. Paint nozzle; 32. Guide block; 33. Mounting base; 34. Drive block; 341. Drive groove; 4. Suction duct; 41. Suction opening section; 411. First rotating shaft; 412. Grinding cylinder; 413. Turbine; 41 4. Slide rail; 415. Slider; 416. Compression spring; 42. First straight section; 43. Filter section; 44. Second straight section; 45. Filter screen; 46. Brush bristles; 5. Exhaust fan; 51. Suction motor; 52. Suction fan blade; 6. Storage tank; 61. Paint pump; 7. Receiving box; 71. Receiving plate; 72. First tension spring; 8. Third rotating shaft; 81. First gear; 82. Turntable; 83. Drive shaft; 9. Second rotating shaft; 91. Worm gear; 10. Wall. Detailed Implementation

[0032] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that in the embodiments of the present invention, all directional indications (such as up-down-left-right-forward-backward...) are only used to explain the relative positional relationship and movement between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0035] like Figures 1-6As shown, a building exterior wall spraying device includes a suspension frame 1 suspended on the outside of a wall 10. The suspension frame 1 includes a base plate 11 and side plates 12 fixed on both sides of the base plate 11. A reciprocating screw 2 is rotatably connected between the side plates 12. A drive motor 13 is fixedly installed on one side plate 12. The output shaft of the drive motor 13 is connected to the reciprocating screw 2 to drive the reciprocating screw 2 to rotate. A threaded sleeve 21 is provided on the reciprocating screw 2, which moves back and forth along the reciprocating screw 2. A mounting plate 3 is fixedly connected to the threaded sleeve 21. A paint nozzle 31 facing the surface of the wall 10 is provided on the mounting plate 3. The two side plates... A guide rod 14 is fixedly connected between 12, and the guide rod 14 is arranged parallel to the reciprocating screw 2. A guide block 32 is fixedly connected to the bottom of the mounting plate 3, and the guide block 32 is slidably connected to the guide rod 14 to slide along the axial direction of the guide rod 14. An air intake duct 4 is installed on the base plate 11, and the air intake duct 4 is located below the paint nozzle 31. The air intake end of the air intake duct 4 faces the surface of the wall 10. An exhaust fan 5 is provided in the air intake duct 4. The exhaust fan 5 is used to draw the inner cavity of the air intake duct 4 close to the surface of the wall 10 to create a negative pressure so that the end of the air intake duct 4 is attached to the surface of the wall 10.

[0036] Using the above scheme, the exhaust fan 5 draws air from the suction duct 4 into a negative pressure, causing the air pressure to adhere the spraying device to the surface of the wall 10, thereby maintaining the stability of the entire spraying device and preventing the spraying device from shaking and causing uneven spraying; the paint nozzle 31 is driven by the rotation of the reciprocating screw 2, moving back and forth along the reciprocating screw 2 to spray the surface of the wall 10, improving the spraying effect and making the spraying more uniform.

[0037] The air intake duct 4 includes an air intake opening section 41, a first straight cylindrical section 42, a filter section 43, and a second straight cylindrical section 44 connected in sequence. The air intake opening section 41 is shaped like a trumpet in the horizontal direction. A filter screen 45 is provided in the filter section 43. The filter screen 45 has a frustum structure. The filter screen 45 increases the ventilation area through the inclined surface of the side of the frustum structure, which facilitates the passage of air. The second straight cylindrical section 44 is located on the side of the filter section 43 away from the first straight cylindrical section 42, and an exhaust fan 5 is provided in the second straight cylindrical section 44. The exhaust fan 5 includes an air intake motor 51 installed in the second straight cylindrical section 44. An air intake fan blade 52 is fixedly connected to the output shaft of the air intake motor 51. The air intake motor 51 drives the air intake fan blade 52 to rotate, so that the air in the air intake duct 4 near the wall is drawn out to the side away from the wall. The suction motor 51 drives the suction fan blades 52 to rotate, expelling the gas in the suction duct 4 outward. This creates a negative pressure at the end of the suction duct 4 near the wall 10, which in turn keeps the spraying device close to and in contact with the surface of the wall 10. The suction opening section 41 faces the wall 10 and is shaped like a trumpet, thereby increasing the adsorption area and improving adhesion, thus maintaining the stability of the device.

[0038] A brush bristle 46 is fixedly connected to the periphery of the end face of the air intake section 41, and the ends of the brush bristle 46 abut against the surface of the wall 10. Through the contact between the brush bristle 46 and the wall 10, the softness of the brush bristle 46 allows it to remain in close contact with the surface of the wall 10. During the spraying process of the spraying device spraying the wall 10 from top to bottom, the brush bristle 46 brushes and cleans the unsprayed surface of the wall 10, thereby removing foreign objects.

[0039] The inner wall of the air intake opening section 41 is rotatably connected to a first rotating shaft 411, which is horizontally arranged. A grinding cylinder 412 is fixedly connected to the first rotating shaft 411. The grinding cylinder 412 abuts against the surface of the wall 10 to grind the surface of the wall 10. The output shaft of the air intake motor 51 is fixedly connected to a second rotating shaft 9. The end of the second rotating shaft 9 extends to one side of the first rotating shaft 411 and is fixedly connected to a worm gear 91. A turbine 413 is fixedly connected to the first rotating shaft 411. The worm gear 91 and the turbine 413 mesh to form a turbine 413 worm gear 91 transmission. The air intake motor 51 drives the air intake fan blade 52 to rotate and draw air while driving the second rotating shaft 9 to rotate and drive the grinding cylinder 412 to grind the surface of the wall 10. The surface of the wall 10 is sanded by the sanding cylinder 412, which increases the surface roughness of the wall 10 and thus improves the adhesion of the paint. The dust generated by sanding is drawn in by the suction fan blade 52 and filtered and collected by the filter screen 45, thus preventing the sanding dust from drifting into the external space and causing air pollution. The sanding cylinder 412 and the suction fan blade 52 rotate synchronously, so that while the sanding cylinder 412 is sanding the surface of the wall 10, the suction fan blade 52 draws in air to collect the dust in time. Since the suction opening section 41 is equipped with bristles 46 around its perimeter, the upper bristles 46 clean the sanded surface of the wall 10 and are collected by the suction, thus keeping the sanded wall 10 clean and preventing dust from reducing the adhesion between the sprayed paint and the surface of the wall 10.

[0040] The air intake section 41 has grooves 414 on both sides of its inner wall. A slider 415 is slidably connected in the grooves 414. Both ends of the first rotating shaft 411 are rotatably connected to the slider 415. A compression spring 416 is provided on the side of the slider 415 away from the wall 10. One end of the compression spring 416 abuts against the slider 415, and the other end abuts against the end of the groove 414. The elastic force provided by the compression spring 416 keeps the slider 415 moving towards the wall 10, thereby keeping the grinding cylinder 412 on the first rotating shaft 411 abutting against the wall 10. This allows the grinding cylinder 412 to remain in contact with the surface of the wall 10 during rotation, thus grinding the wall 10.

[0041] A storage tank 6 for storing paint is fixedly connected to the lower center of the base plate 11. A paint pump 61 is installed on the storage tank 6. The outlet of the paint pump 61 is connected to a paint nozzle 31 through a pipeline, allowing the paint to be pumped into the nozzle and sprayed out. The paint pump 61 is located below the base plate 11, and the weight of the storage tank 6 provides counterweight to the base plate 11, preventing the base plate 11 from tilting due to the storage tank 6 being placed on it.

[0042] A receiving box 7 is provided at the upper end of the air intake opening section 41. The receiving box 7 is located below the nozzle, and its bottom is connected to the storage tank 6 via a pipe. The receiving box 7 is used to collect paint overflowing from the paint nozzle 31. A receiving plate 71 is hinged to the receiving box 7. The receiving plate 71 is inclined, and the side of the receiving plate 71 away from the receiving box 7 is attached to the surface of the wall 10. A first tension spring 72 is provided at the bottom of the receiving plate 71. One end of the first tension spring 72 is fixedly connected to the receiving plate 71, and the other end of the first tension spring 72 is fixedly connected to the upper surface of the air intake opening section 41. The inclined receiving plate 71 collects the dripping paint and guides it into the receiving box 7. Under the tension of the first tension spring 72, the side of the receiving plate 71 away from the receiving box 7 remains attached to the surface of the wall 10, thereby ensuring effective collection of dripping paint.

[0043] A rack 15 is fixedly connected to one side of the guide rod 14. A third rotating shaft 8 is rotatably connected to the mounting plate 3. The third rotating shaft 8 is vertically arranged and its lower end passes through the mounting plate 3 and is fixedly connected to a first gear 81. The first gear 81 and the rack 15 mesh to form a gear-rack 15 transmission. A turntable 82 is fixedly connected to the upper end of the third rotating shaft 8. A drive shaft 83 is fixedly connected to the turntable 82 at an eccentric position. A mounting base 33 is rotatably connected to the mounting plate 3. The paint nozzle 31 is fixedly connected to the mounting base 33. A drive block 34 is fixedly connected to the bottom of the mounting base 33. A drive groove 341 is provided on the drive block 34. The drive groove 341 is elongated. The drive shaft 83 is inserted into the drive groove 341 to drive the drive block 34 to swing. As the mounting plate 3 moves back and forth along the reciprocating screw 2, the first gear 81 rotates through the gear transmission of the rack 15. The rotation of the first gear 81 drives the drive block 34 to swing, which in turn drives the paint nozzle 31 on the mounting base 33 to swing, thereby swinging the spraying of the wall panel 10, improving the spraying efficiency and uniformity.

[0044] Specifically, a fixing plate 16 is fixedly connected to the side of the suspension frame 1 closest to the wall 10, and a roller 17 is rotatably connected to the fixing plate 16. The roller 17 is used to abut against the surface of the wall 10, thereby enabling rolling movement and reducing movement resistance. A suspension rope 18 is provided on the side plate 12 for suspension. This facilitates the suspension of the device. In use, the device is fixed to the suspension rope 18 by a rope set on the ceiling. By controlling the extension length of the suspension rope, the vertical movement of the spraying device suspended at the lower end of the suspension rope is controlled, thus facilitating the vertical spraying of the surface of the wall 10.

[0045] A spraying method for a building exterior wall spraying device, applied to the aforementioned building exterior wall spraying device, comprises the following steps:

[0046] 1. The spraying device is suspended on the outside of the wall 10 by a rope;

[0047] 2. Start the exhaust fan 5. The suction duct 4 generates negative pressure, which keeps the spraying device attached to the surface of the wall 10.

[0048] 3. Start the paint pump 61 to begin delivering paint, and spray the paint onto the surface of the wall 10 through the paint nozzle 31;

[0049] 4. The drive motor 13 drives the reciprocating screw 2 to rotate, which in turn drives the paint nozzle 31 to move back and forth to spray paint on the surface of the wall 10. The spraying device moves from top to bottom by lowering the rope, thereby spraying paint on the surface of the wall 10 from top to bottom.

[0050] The parts not covered in this technical solution can be implemented using existing technologies.

[0051] The foregoing has shown and described the basic principles, main features, and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A building exterior wall spraying device, characterized in that: The system includes a suspension frame suspended from the outside of a wall. The suspension frame comprises a base plate and side plates fixed to both sides of the base plate. A reciprocating screw is rotatably connected between the side plates. A drive motor is fixedly mounted on one side plate, and the output shaft of the drive motor is connected to the reciprocating screw to drive its rotation. A threaded sleeve is provided on the reciprocating screw, and a mounting plate is fixedly connected to the threaded sleeve. A paint nozzle facing the wall surface is provided on the mounting plate. A [missing information - likely a device or mechanism] is fixedly connected between the two side plates. A guide rod is provided, which is parallel to the reciprocating lead screw. A guide block is fixedly connected to the bottom of the mounting plate, and the guide block is slidably connected to the guide rod to slide along the axial direction of the guide rod. An air intake duct is installed on the base plate, which is located below the paint nozzle. The air intake end of the air intake duct faces the wall surface. An exhaust fan is installed in the air intake duct, which is used to draw negative pressure into the inner cavity of the air intake duct near the wall surface so that the end of the air intake duct is in contact with the wall surface. The air intake duct includes an air intake opening section, a first straight section, a filter section, and a second straight section connected in sequence. The air intake opening section is shaped like a trumpet in the horizontal direction. The filter section is equipped with a filter screen, which has a frustum-shaped structure. The second straight section is located on the side of the filter section away from the first straight section, and an exhaust fan is installed inside the second straight section. The exhaust fan includes an air intake motor installed inside the second straight section. An air intake fan blade is fixedly connected to the output shaft of the air intake motor. The air intake motor drives the air intake fan blade to rotate, causing air in the air intake duct near the wall to be drawn away from the wall. The inner wall of the air intake section is rotatably connected to a first rotating shaft, which is horizontally arranged. A grinding cylinder is fixedly connected to the first rotating shaft, and the grinding cylinder abuts against the wall surface to grind the wall surface. The output shaft of the air intake motor is fixedly connected to a second rotating shaft. The end of the second rotating shaft extends to one side of the first rotating shaft and is fixedly connected to a worm gear. A turbine is fixedly connected to the first rotating shaft. The worm gear and the turbine gear mesh to form a worm gear transmission. The air intake motor drives the air intake fan blades to rotate and draw in air while driving the second rotating shaft to rotate and drive the grinding cylinder to grind the wall surface. A rack is fixedly connected to one side of the guide rod. A third rotating shaft is rotatably connected to the mounting plate. The third rotating shaft is vertically arranged and its lower end passes through the mounting plate and is fixedly connected to a first gear. The first gear and the rack mesh to form a rack and pinion transmission. A turntable is fixedly connected to the upper end of the third rotating shaft. A drive shaft is fixedly connected to an eccentric position on the turntable. A mounting base is rotatably connected to the mounting plate. The paint nozzle is fixedly connected to the mounting base. A drive block is fixedly connected to the bottom of the mounting base. A drive groove is provided on the drive block. The drive groove is elongated. The drive shaft passes through the drive groove to drive the drive block to swing.

2. The building exterior wall spraying device according to claim 1, characterized in that: The end face of the air intake section is fixedly connected with bristles, and the ends of the bristles abut against the wall surface.

3. The building exterior wall spraying device according to claim 2, characterized in that: The inner walls on both sides of the air intake section are provided with sliding grooves, and a slider is slidably connected in the sliding groove. The two ends of the first rotating shaft are rotatably connected to the slider. A compression spring is provided on the side of the slider away from the wall. One end of the compression spring abuts against the slider, and the other end of the compression spring abuts against the end of the sliding groove.

4. The building exterior wall spraying device according to claim 1, characterized in that: A storage tank for storing paint is fixedly connected to the lower center of the base plate. A paint pump is installed on the storage tank. The outlet of the paint pump is connected to the paint nozzle through a pipeline to pump the paint into the paint nozzle for spraying.

5. The building exterior wall spraying device according to claim 1, characterized in that: A receiving box is provided at the upper end of the air intake section. The receiving box is located below the nozzle. The bottom of the receiving box is connected to the storage tank through a pipe. The receiving box is used to collect paint overflowing from the paint nozzle. A receiving plate is hinged in the receiving box. The receiving plate is inclined and the side of the receiving plate away from the receiving box is attached to the wall surface. A first tension spring is provided at the bottom of the receiving plate. One end of the first tension spring is fixedly connected to the receiving plate, and the other end of the first tension spring is fixedly connected to the upper surface of the air intake section.

6. The building exterior wall spraying device according to claim 1, characterized in that: A fixing plate is fixedly connected to the side of the suspension frame closest to the wall, and rollers are rotatably connected to the fixing plate.

7. A spraying method for a building exterior wall spraying device, applied to the building exterior wall spraying device as described in claim 4, characterized in that: Follow these steps:

1. Suspend the spraying device on the outside of the wall using ropes; 2. Turn on the exhaust fan. The suction duct generates negative pressure, which keeps the spraying device in contact with the wall surface.

3. Start the paint pump to deliver paint, and spray the paint onto the wall surface through the paint nozzle; 4. The drive motor drives the reciprocating screw to rotate, which in turn drives the paint nozzle to move back and forth to spray paint on the wall surface. The spraying device moves from top to bottom by lowering the rope, thereby spraying paint on the wall surface from top to bottom.

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