Automatic paint spraying device for construction site and its spraying method

Abstract

The present invention provides an automatic paint spraying device for a construction site and a spraying method thereof. The spraying device includes a trolley, a trolley support, multiple sets of traveling mechanisms installed on the trolley support, and a spraying device installed on the trolley. The trolley support is an annular support sleeved outside the structure to be sprayed. The multiple sets of traveling mechanisms are dispersedly arranged on the inner ring surface of the trolley support. An annular trolley track is installed on the trolley support, and the trolley is located above the trolley support. When spraying, the trolley support and the traveling mechanisms are installed on the outer surface of the structure to be sprayed, the trolley is installed on the annular trolley track, paint is added to the spraying container, it is moved to the starting position, and spraying is carried out during the movement of the trolley. After one round of spraying is completed, it is moved to the next spraying position. The present invention improves the paint spraying efficiency and spraying quality, reduces the work of high-altitude operations, reduces safety risks, the equipment is safe and reliable, and has wide application value and economic value.

Description

Technical Field

[0001] The present invention relates to the field of paint spraying, and more specifically to an automatic paint spraying device for construction sites and its spraying method. Background Art

[0002] Common construction methods of paint include brushing, flooding, spraying, etc. Equipment and structural painting are generally completed in the workshop. Painting in the workshop has the advantages of high efficiency, uniform thickness, guaranteed quality, and environmental protection.

[0003] After long-term use and corrosion of factory building column structures, large pipelines, etc., the originally painted paint will peel off and fall off, resulting in a weakened protective performance of the structural members. To ensure the normal use of the structural members, technical transformation and re-painting are generally required. However, these structures cannot be removed and can only be constructed on-site. Manual brushing not only has low efficiency and difficult quality assurance, but also has significant safety hazards such as working at heights.

[0004] For the above reasons, the present invention provides a device and construction method with simple equipment, high construction efficiency, safety and reliability, which have wide application value and economic value. Summary of the Invention

[0005] The present invention provides an automatic paint spraying device for construction sites and its spraying method. The spraying device can walk on structures such as columns and pipelines and automatically spray paint, enabling on-site construction to ensure that the paint is evenly sprayed onto the surfaces of the construction structures and components.

[0006] To achieve the above technical objectives, the present invention provides an automatic paint spraying device for construction sites. The automatic paint spraying device includes a trolley, a spraying device, a trolley support, and multiple groups of traveling mechanisms installed on the trolley support. The trolley support is an annular support sleeved outside the structure to be sprayed. Multiple groups of traveling mechanisms are dispersedly arranged on the inner ring surface of the trolley support. An annular trolley track is installed on the trolley support, and the trolley is located above the trolley support;

[0007] The traveling mechanism includes a traveling support, a driving motor and traveling wheels installed on the traveling support. The traveling support is fixedly installed on the trolley support and extends to the inner ring surface of the trolley support. The traveling wheels are rotatably installed at one end of the traveling support extending to the inner ring surface of the trolley support, and their roller surfaces are in contact with the outer surface of the structure to be sprayed. A pressure regulator for controlling the contact force between the traveling wheels and the outer surface of the structure to be sprayed is provided on the traveling support; The driving motor is connected to the traveling wheels through a transmission mechanism and controls the traveling wheels to move along the structure to be sprayed;

[0008] The trolley includes a trolley frame, a trolley drive system and a trolley drive gear arranged on the trolley frame. The trolley frame is mounted on a trolley support. The trolley track is a gear track. The trolley drive gear meshes with the trolley track and is driven by the trolley drive system to move along the trolley track.

[0009] The spraying device includes a jet pressurizing device, a paint tank, a spray pipe and a spray head arranged at the end of the spray pipe. The jet pressurizing device and the paint tank are installed on the trolley frame. Its spray pipe extends vertically to the inner ring of the trolley support, and the spray head faces the outer surface of the structure to be sprayed.

[0010] A preferred technical solution of the present invention: The trolley support is an annular support structure composed of two semi-circular supports or multiple arc-shaped supports connected by connecting flanges. The annular support structure includes an annular inner support and an annular outer support connected by a support rod. Both the annular inner support and the annular outer support are made of arc-shaped or semi-circular skeleton sheets formed by square pipes. There are four groups of traveling mechanisms, which are evenly and dispersedly arranged on the inner ring surface of the annular inner support and are connected to the trolley support by bolts. The trolley track is installed on the inner ring surface of the annular outer support.

[0011] A preferred technical solution of the present invention: The transmission mechanism includes a drive gear installed on the output shaft of the drive motor, a transmission gear coaxially installed on the rotating shaft of the traveling wheel, and a drive chain drivingly connecting the drive gear and the transmission gear. A gearbox and a speed control device are provided on the drive motor. The drive motor transmits power to the transmission gear through the gearbox and the drive chain, and drives the traveling wheel to rotate and move through the transmission gear.

[0012] A preferred technical solution of the present invention: The jet pressurizing device is fixed to the trolley frame by bolts. The paint tank is installed on the jet pressurizing device. The distance between the spray head and the outer surface of the structure to be sprayed is 200 - 300 mm. The paint in the paint tank is evenly sprayed on the outer surface of the structure to be sprayed through the spray pipe and the spray head by the jet pressurizing device.

[0013] A preferred technical solution of the present invention: The structure to be sprayed is a construction structure with a circular or square cross-section, including columns, large pipes or support structures. The inner diameter of the trolley support is 300 - 500 mm larger than the diameter or side length of the structure to be sprayed.

[0014] A preferred technical solution of the present invention: The traveling mechanism is powered by a cable. The power device of the trolley is powered by a battery. The traveling wheel is a rubber wheel. The traveling support is a length-adjustable support, and the traveling speed of the traveling support is adapted to the moving speed of the trolley.

[0015] Preferred technical solution of the present invention: The trolley frame includes a horizontal support frame and vertical support frames vertically connecting both ends of the horizontal support frame. The width between the two vertical support frames matches the width of the trolley support. Guide wheels are respectively provided at the bottoms of the two vertical support frames of the trolley frame. At the bottom of the horizontal support frame, a set of support wheels are respectively provided at positions corresponding to the annular inner support and the annular outer support. The trolley drive gear is installed between the two support wheels through a bracket. When the trolley frame is mounted on the trolley support, the two guide wheels are respectively in contact with the inner ring surface of the annular inner support and the outer ring surface of the annular outer support. The two sets of support wheels are respectively in contact with the upper end surfaces of the annular inner support and the annular outer support. The trolley drive gear meshes with the trolley track installed on the inner ring surface of the annular outer support. The trolley drive system transmits power to the trolley drive gear, causing the trolley to rotate along the trolley track.

[0016] To achieve the above technical objectives, the present invention also provides a spraying method for an automatic paint spraying device used at a construction site, which is characterized by the following specific steps:

[0017] (1) Install a trolley support and a traveling mechanism on the structure to be sprayed. Adjust the traveling wheels through the traveling support to make them contact the outer surface of the structure to be sprayed, and apply pressure through a pressure regulator to make it closely adhere to the outer surface of the structure to be sprayed;

[0018] (2) Install a trolley and a spraying device on the trolley support, and load the paint prepared according to the design requirements into the paint tank. Conduct a joint debugging of the traveling system and the spraying system to determine the construction parameters. Make the spray head perpendicular to the outer surface of the structure to be sprayed, and the distance is 200 - 300 mm;

[0019] (3) Start the drive system of the trolley and the spraying device, make the trolley move in a circular motion along the trolley support. At the same time, the pressurizing device applies pressure to the paint tank, and sprays the paint onto the object surface through the spray pipe and the spray head to form a paint film;

[0020] (4) After the first round of spraying is completed, control the traveling mechanism to move, driving the entire trolley support to move to the next position for the paint spraying process of the next part.

[0021] Preferred technical solution of the present invention: In step (3), the process of spraying paint while moving in a circular motion is repeated 2 - 3 times, and then the shift in step (4) is carried out. During the shift process, the traveling mechanism determines the number of starts according to needs.

[0022] Preferred technical solution of the present invention: The traveling mechanism is powered by a cable; the power device of the trolley is powered by a storage battery; the speed of the traveling mechanism is adapted to the moving speed of the trolley to ensure uniform spraying.

[0023] Advantages of the present invention:

[0024] (1) The present invention is provided with a pulley bracket that matches the construction structure, and an automatic walking mechanism is arranged on the pulley bracket. It advances by the friction force between the walking wheels of the walking mechanism and the surface of the structural member. By adjusting the pressure between the walking wheels and the structural surface, the greater the pressure, the greater the friction force and the greater the driving force, so that it can overcome the resistance and advance. It can ensure that it stably walks along the surfaces of columns, large pipelines and other structures that need to be painted at the construction site, and can climb up and down or move horizontally along structures such as columns or large pipelines, avoiding the problems of inability to climb due to the smooth surface of the structure and the danger of manual climbing.

[0025] (2) The pulley bracket in the present invention can be assembled and welded on-site, and can be applicable to various construction structures with different shapes; the walking wheels of its walking device are made of rubber wheels, and a pressurizing device is provided. The pressure is adjusted by the driving wheel regulator to closely adhere to the surface of the component, ensuring good contact with the surface of the object to be painted and no slippage during walking; the driving motor transmits the power to the driving gear through the gearbox and the driving chain, enabling the entire device to automatically walk along the structural surface. The walking speed of the bracket is adapted to the rotation speed of the pulley to ensure uniform spraying;

[0026] (3) The present invention is provided with a pulley track on the pulley bracket. The spraying device is installed on the pulley and driven by the pulley to move along the pulley track for spraying. When the pulley bracket moves to a certain position, the spraying device can be driven by the pulley to move annularly around the surface of the construction structure to be sprayed, ensuring that the entire surface of the structure is painted, improving the construction efficiency and the spraying quality.

[0027] (4) The spraying device in the present invention can automatically adjust the distance between the nozzle and the surface of the object through the distance sensing device, ensuring that the nozzle is perpendicular to the surface of the object and enabling the paint to be evenly sprayed onto the structural surface.

[0028] The spraying device and the spraying method in the present invention can effectively solve the problems of low construction efficiency on-site for paint, difficult quality assurance, difficult high-altitude operation, and dangerous manual paint spraying, making the on-site paint construction efficient, safe, and reliable in quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The plan view of the spraying device in the present invention;

[0030] Figure 2 is Figure 1 The sectional view taken along A - A in

[0031] Figure 3 The structural schematic diagram of the walking structure in the present invention;

[0032] Figure 4 is Figure 3 The sectional view taken along B - B in

[0033] Figure 5 Schematic structural diagram of the pulley support in the present invention;

[0034] Figure 6 Cross-sectional view of the connection part of the pulley support in the present invention;

[0035] Figure 7 Schematic structural diagram of the pulley in the present invention

[0036] Figure 8 is Figure 7 Cross-sectional view C-C in

[0037] In the figure: 1 - traveling mechanism; 100 - driving motor; 101 - driving chain; 102 - transmission gear; 103 - traveling wheel; 104 - pressure regulator; 105 - traveling support; 106 - driving gear; 107 - gearbox; 2 - pulley support; 200 - annular inner support; 201 - connecting flange, 202 - annular outer support; 3 - pulley track; 4 - pulley; 400 - pulley frame; 401 - pulley drive system; 402 - pulley drive gear; 403 - guide wheel; 404 - support wheel; 5 - structure to be sprayed; 6 - injection pressurizing device; 7 - paint tank; 8 - spray pipe; 9 - spray head. Specific embodiments

[0038] The present invention will be further described below with reference to the drawings and embodiments. The attached Figures 1 to 8 All are drawings of the embodiments, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the purpose of the embodiments of the present invention. The technical solutions shown in the drawings below are the specific solutions of the embodiments of the present invention and are not intended to limit the scope of the present invention claimed. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the invention product is usually placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] An automatic paint spraying device for construction sites provided by the embodiment, such as Figure 1 and Figure 2As shown in the figure, the automatic paint spraying device includes a trolley 4, a spraying device, a trolley support 2, and multiple sets of traveling mechanisms 1 installed on the trolley support 2. The trolley support 2 is an annular support sleeved outside the structure 5 to be sprayed. The multiple sets of traveling mechanisms 1 are dispersedly arranged on the inner ring surface of the trolley support 2. An annular trolley track 3 is installed on the trolley support 2. The trolley 4 is located above the trolley support 2. The spraying device includes a jet pressurizing device 6, a paint tank 7, a spray pipe 8, and a nozzle 9 provided at the end of the spray pipe 8. The jet pressurizing device 6 and the paint tank 7 are installed on the trolley frame 400. Its spray pipe 8 vertically extends to the inner ring of the trolley support 2, and the nozzle 9 faces the outer surface of the structure 5 to be sprayed. As Figure 5 shown, the trolley support 2 is an annular support structure composed of two semi-circular supports or multiple arc-shaped supports connected by a connecting flange 201. The annular support structure includes an annular inner support 200 and an annular outer support 202 connected by a support rod. Both the annular inner support 200 and the annular outer support 202 are made of arc-shaped or semi-circular skeleton sheets formed by square pipes. The trolley track 3 is installed on the inner ring surface of the annular outer support 202. The structure 5 to be sprayed is a construction structure with a circular or square cross-section, including columns, large pipes, or support structures. The inner diameter of the trolley support 2 is 300 - 500 mm larger than the diameter or side length of the structure 5 to be sprayed.

[0041] An automatic paint spraying device for a construction site provided by the embodiment, as Figure 1 and Figure 5 shown, there are four sets of traveling mechanisms 1, which are equidistantly and dispersedly arranged on the inner ring surface of the annular inner support 200 and are connected to the trolley support 2 by bolts. As Figure 3 and Figure 4 shown, each set of traveling mechanisms 1 includes a traveling support 105, a driving motor 100, and a traveling wheel 103 installed on the traveling support. The traveling support 105 is fixedly installed on the trolley support 2 and extends to the inner ring surface of the trolley support 2. The traveling wheel 103 is rotatably installed at one end of the traveling support 105 extending to the inner ring surface of the trolley support 2. Its roller surface contacts the outer surface of the structure 5 to be sprayed, and a pressure regulator 104 for controlling the contact force between the traveling wheel 103 and the outer surface of the structure 5 is provided on the traveling support 105. The driving motor 100 is connected to the traveling wheel 103 through a transmission mechanism and controls the traveling wheel 103 to travel along the structure 5 to be sprayed. The transmission mechanism includes a driving gear 106 installed on the output shaft of the driving motor 100, a transmission gear 102 coaxially installed on the rotating shaft of the traveling wheel 103, and a driving chain 101 drivingly connecting the driving gear 106 and the transmission gear 102. A gearbox 107 and a speed control device are provided on the driving motor 100. The driving motor 104 transmits power to the transmission gear 102 through the gearbox 107 and the driving chain 101, and drives the traveling wheel 103 to rotate and travel through the transmission gear 102.

[0042] An automatic paint spraying device for construction sites provided by the embodiment is as follows Figure 7 and Figure 8 As shown, the trolley 4 includes a trolley frame 400, a trolley drive system 401 and a trolley drive gear 402 arranged on the trolley frame 400. The trolley frame 400 includes a transverse support frame and vertical support frames vertically connecting both ends of the transverse support frame. The width between the two vertical support frames matches the width of the trolley support 2. Guide wheels 403 are respectively arranged at the bottoms of the two vertical support frames of the trolley frame 400. A set of support wheels 404 are respectively arranged at the bottom of the transverse support frame corresponding to the annular inner support 200 and the annular outer support 202. The trolley drive gear 402 is installed between the two sets of support wheels 404 through a bracket; the trolley track 3 is a gear track. The trolley frame 400 is erected on the trolley support 2. The two guide wheels 403 are respectively in contact with the inner ring surface of the annular inner support 200 and the outer ring surface of the annular outer support 202. The two support wheels 404 are respectively in contact with the upper end surfaces of the annular inner support 200 and the annular outer support 202. The trolley drive gear 402 meshes with the trolley track 3 installed on the inner ring surface of the annular outer support 202; the trolley drive system 401 transmits power to the trolley drive gear 402 to make the trolley move circumferentially along the trolley track 3. The spray pressurizing device 6 is fixed on the trolley frame 400 through bolts. The paint tank 7 is installed on the spray pressurizing device 6. A distance sensing device can be provided on the spray head 9, and through the distance sensing device, the distance between the spray head 9 and the outer surface of the structure 5 to be sprayed is automatically adjusted to 200 - 300 mm; the paint in the paint tank 7 is evenly sprayed on the outer surface of the structure 5 to be sprayed through the spray pipe 8 and the spray head 9 by the spray pressurizing device 6.

[0043] The traveling mechanism 1 in the present invention is powered by a cable; the power device of the trolley 4 is powered by a storage battery; the traveling wheel 103 is a rubber wheel, and the traveling support 105 is a length-adjustable support. The traveling speed of the traveling support 105 is adapted to the moving speed of the trolley 4.

[0044] When using the present invention for on-site paint construction, after the design drawings are determined, the trolley support and the trolley track are fabricated. The specific construction method of paint spraying is as follows:

[0045] (1) According to the dimensions of the structural member, fabricate the trolley support 2 and the trolley track 3, install the trolley support 2 and the traveling mechanism 1 on the structure 5 to be sprayed. Adjust the traveling wheel 102 through the traveling support 105 to make it in contact with the outer surface of the structure 5 to be sprayed, and apply pressure to the traveling wheel 102 through the pressure regulator 104 to make it closely adhere to the outer surface of the structure 5 to be sprayed;

[0046] (2) Install a pulley and a spraying device on the pulley support, load the paint prepared according to the design requirements into the paint tank, conduct a joint commissioning of the walking system and the spraying system, and determine the construction parameters such as the speed of the walking system, the rotation speed of the pulley around the structural member, the paint spraying distance, and the pressure; make the nozzle perpendicular to the outer surface of the structure to be sprayed, and the distance is 200 - 300 mm;

[0047] (3) Turn on the driving system of the pulley and the spraying device, make the pulley move in a circular motion along the pulley support, and at the same time, the pressurizing device applies pressure to the paint tank, and sprays the paint onto the object surface through the spray pipe and the nozzle to form a paint film; after repeating the above paint spraying process 2 - 3 times;

[0048] (4) After the first - round spraying is completed, control the movement of the walking mechanism 1 to drive the entire pulley support 2 to move to the next position for the paint spraying process of the next part; during the displacement process, the walking mechanism 1 determines the number of units to be turned on as needed; the walking mechanism is powered by a cable; the power device of the pulley is powered by a storage battery; the speed of the walking mechanism is adapted to the moving speed of the pulley to ensure uniform spraying.

[0049] Example: The present invention is directed to the high - temperature - resistant paint coating of the columns in the main workshop of a certain factory. The columns are 12 - 15 m high, with a rectangular cross - section, and two specifications of cross - section sizes of 1.6 * 1.9 m and 0.9 * 1.6 m. There are many equipment and materials around the columns of the workshop, and the light is dim. The measured surface temperature of the columns can reach 300 °C, and it is difficult to implement conventional manual brushing construction. The construction personnel use the installation method described in the present invention to install the drainage board. The specific installation process is as follows:

[0050] (1) Fabricate the pulley support 2 according to the columns to be sprayed, and install four groups of walking mechanisms 1 on the pulley support 2; install the pulley support 2 and the walking mechanism 1 on the column, adjust the walking wheels through the pressure regulator 104 and apply a certain pressure to make it contact with the column surface;

[0051] (2) Install a pulley 4 and a spraying device on the pulley support 2, load the paint prepared according to the design requirements into the paint tank, conduct a joint commissioning of the walking system and the spraying system, and determine the construction parameters such as the speed of the walking system, the rotation speed of the pulley around the structural member, the paint spraying distance, and the pressure; make the nozzle perpendicular to the outer surface of the structure to be sprayed, and the distance is 200 - 300 mm;

[0052] (3) After the commissioning is completed, move the entire device to the spraying starting point through the walking mechanism 1; turn on the device, and the system automatically sprays according to the set parameters; during the spraying process, turn on the driving system of the pulley 4 and the spraying device, make the pulley 4 move in a circular motion along the pulley support 2, and at the same time, the pressurizing device 6 applies pressure to the paint tank 7, and sprays the paint onto the three - dimensional surface through the spray pipe 8 and the nozzle 9 to form a paint film;

[0053] (4) After the paint is dry, repeat the spraying process in (3) for the second spraying, and it can be repeated 2 to 3 times;

[0054] (5) After the first round of spraying is completed, control the movement of the traveling mechanism 1 to drive the overall movement of the trolley support 2 to the next position to perform the paint spraying process for the next part.

[0055] As mentioned above, this is only one embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An automatic paint spraying device for a construction site, characterized in that: The automatic paint spraying device includes a trolley (4), a spraying device, a trolley support (2), and multiple groups of traveling mechanisms (1) installed on the trolley support (2). The trolley support (2) is an annular support sleeved outside the structure to be sprayed (5). The multiple groups of traveling mechanisms (1) are dispersedly arranged on the inner ring surface of the trolley support (2). An annular trolley track (3) is installed on the trolley support (2). The trolley (4) is located above the trolley support (2). The traveling mechanism (1) includes a traveling support (105), a driving motor (100) and a traveling wheel (103) installed on the traveling support. The traveling support (105) is fixedly installed on the trolley support (2) and extends to the inner ring surface of the trolley support (2). The traveling wheel (103) is rotatably installed at one end of the traveling support (105) extending to the inner ring surface of the trolley support (2). Its roller surface contacts the outer surface of the structure to be sprayed (5). A pressure regulator (104) for controlling the contact force between the traveling wheel (103) and the outer surface of the structure to be sprayed (5) is provided on the traveling support (105). The driving motor (100) is connected to the traveling wheel (103) through a transmission mechanism and controls the traveling wheel (103) to travel along the structure to be sprayed (5). The trolley (4) includes a trolley frame (400), a trolley drive system (401) and a trolley drive gear (402) provided on the trolley frame (400). The trolley frame (400) is erected on the trolley support (2). The trolley track (3) is a gear track. The trolley drive gear (402) meshes with the trolley track (3), and the trolley drive gear (402) is driven to move along the trolley track (3) through the trolley drive system (401). The spraying device includes a jet pressurizing device (6), a paint tank (7), a spray pipe (8) and a spray head (9) provided at the end of the spray pipe (8). The jet pressurizing device (6) and the paint tank (7) are installed on the trolley frame (400). Its spray pipe (8) vertically extends to the inner ring of the trolley support (2), and the spray head (9) faces the outer surface of the structure to be sprayed (5). The transmission mechanism includes a drive gear (106) installed on the output shaft of the driving motor (100), a transmission gear (102) coaxially installed on the rotating shaft of the traveling wheel (103), and a drive chain (101) drivingly connecting the drive gear (106) and the transmission gear (102). A gearbox (107) and a speed control device are provided on the driving motor (100). The driving motor (100) transmits power to the transmission gear (102) through the gearbox (107) and the drive chain (101), and drives the traveling wheel (103) to rotate and travel through the transmission gear (102).

2. The automatic paint spraying device for construction sites according to claim 1, characterized in that: The pulley support (2) is an annular support structure composed of two semi-circular supports or multiple arc-shaped supports connected by a connecting flange (201). The annular support structure includes an annular inner support (200) and an annular outer support (202) connected by a support rod. Both the annular inner support (200) and the annular outer support (202) are made of arc-shaped or semi-circular skeleton sheets formed by square tubes. Four groups of traveling mechanisms (1) are provided, evenly and dispersedly arranged on the inner ring surface of the annular inner support (200), and are bolted to the pulley support (2). The pulley track (3) is installed on the inner ring surface of the annular outer support (202).

3. The automatic paint spraying device for the construction site according to claim 1 or 2, characterized in that: The spraying and pressurizing device (6) is fixed to the pulley frame (400) by bolts. The paint tank (7) is installed on the spraying and pressurizing device (6). The distance between the spray head (9) and the outer surface of the structure to be sprayed (5) is 200 - 300 mm. The paint in the paint tank (7) is evenly sprayed on the outer surface of the structure to be sprayed (5) through the spray pipe (8) and the spray head (9) by the spraying and pressurizing device (6).

4. An automatic paint spraying device for a construction site according to claim 1 or 2, characterized in that: The structure to be sprayed (5) is a construction structure with a circular or square cross-section, including columns, large pipelines or support structures. The inner diameter of the pulley support (2) is 300 - 500 mm larger than the diameter or side length of the structure to be sprayed (5).

5. The automatic paint spraying device for a construction site according to claim 1 or 2, characterized in that: The traveling mechanism (1) is powered by a cable. The power device of the pulley (4) is powered by a storage battery. The traveling wheel (103) is a rubber wheel. The traveling support (105) is a length-adjustable support. The traveling speed of the traveling support (105) is adapted to the moving speed of the pulley (4).

6. The automatic paint spraying device for construction site according to claim 2, characterized in that: The pulley frame (400) includes a transverse support frame and vertical support frames vertically connecting both ends of the transverse support frame. The width between the two vertical support frames matches the width of the pulley support (2). Guide wheels (403) are respectively provided at the bottoms of the two vertical support frames of the pulley frame (400). A set of support wheels (404) are respectively provided at the bottom of the transverse support frame corresponding to the annular inner support (200) and the annular outer support (202). The pulley drive gear (402) is installed between the two support wheels (404) through a support. When the pulley frame (400) is mounted on the pulley support (2), the two guide wheels (403) are respectively in contact with the inner ring surface of the annular inner support (200) and the outer ring surface of the annular outer support (202). The two sets of support wheels (404) are respectively in contact with the upper end surfaces of the annular inner support (200) and the annular outer support (202). The pulley drive gear (402) meshes with the pulley track (3) installed on the inner ring surface of the annular outer support (202). The pulley drive system (401) transmits power to the pulley drive gear (402) to make the pulley rotate along the pulley track (3).

7. A spraying method implemented by using the automatic paint spraying device for the construction site according to any one of claims 1 to 6, characterized in that The specific steps are as follows: (1) Install the pulley support and the traveling mechanism on the structure to be sprayed. Adjust the traveling wheels through the traveling support to make them contact the outer surface of the structure to be sprayed, and apply pressure through a pressure regulator to make it closely adhere to the outer surface of the structure to be sprayed; (2) Install the pulley and the spraying device on the pulley bracket, load the paint prepared according to the design requirements into the paint tank, conduct a joint debugging of the walking system and the spraying system, and determine the construction parameters; make the nozzle perpendicular to the outer surface of the structure to be sprayed, and the distance is 200-300 mm; (3) Start the driving system of the pulley and the spraying device, make the pulley move in a circular motion along the pulley bracket, and at the same time, the pressurizing device applies pressure to the paint tank, and the paint is sprayed onto the surface of the object through the spray pipe and the nozzle to form a paint film; (4) After the first round of spraying is completed, control the movement of the walking mechanism to drive the overall movement of the pulley bracket to the next position for the paint spraying process of the next part.

8. The spraying method according to claim 7, wherein: In step (3), after the process of spraying paint by moving in a circular motion is repeated 2-3 times, then perform the displacement in step (4); during the displacement process, the walking mechanism determines the number of starts according to needs.

9. The spraying method according to claim 7, wherein: The walking mechanism is powered by a cable; the power device of the pulley is powered by a battery; the speed of the walking mechanism is adapted to the moving speed of the pulley to ensure uniform spraying.

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