Pipeline outer wall spraying device

Abstract

The pipeline outer wall spraying device comprises a crawler body, a driving mechanism and a spraying mechanism, the spraying mechanism comprises a pair of semicircular nozzle supports, a pair of support rotating mechanisms and a pair of rotating shafts, the first end of each nozzle support is connected with the first end of the corresponding rotating shaft, and the second end of each nozzle support is connected with the corresponding rotating shaft. The second ends of the rotating shafts are rotationally connected with the crawl device body, the pair of support rotating mechanisms drive the pair of nozzle supports to rotate through the corresponding pair of rotating shafts, and the pair of first ends and the pair of second ends of the pair of nozzle supports are combined or separated at the same time. When a pair of first ends and a pair of second ends of a pair of nozzle supports are combined oppositely at the same time, an annular support is formed, the annular support is arranged on the outer wall of the pipeline in a sleeving mode, the nozzles conduct comprehensive spraying on the periphery of the outer wall of the pipeline, and the nozzles can move in the axial direction of the long-distance pipeline or the vertical pipeline along with movement of the crawler body to conduct spraying work on the outer wall of the pipeline. And meanwhile, the pipeline outer wall paint spraying device is convenient to use and maintain.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe exterior painting, and specifically to a pipe exterior painting device. Background Technology

[0002] Pipeline external anti-corrosion painting is a process of treating the outer surface of pipelines with anti-corrosion coatings. Its main function is to form a protective film by spraying anti-corrosion paint, thereby preventing damage to the pipeline caused by environmental factors (such as moisture, corrosive gases, and chemicals). The spraying equipment typically includes spray guns, spray pumps, and air compressors, which use high pressure to spray the paint onto the pipeline surface. The anti-corrosion paint is stored and supplied through a paint supply system to ensure a uniform supply.

[0003] Currently, in chemical production and other fields, overhead long-distance pipelines are pipeline systems used for transporting fluids (such as oil, natural gas, chemicals, water, etc.) over long distances. They are typically laid along the ground or on supports, rather than buried underground. These pipeline systems play a vital role in many industrial and infrastructure projects, especially in areas with complex terrain or harsh environments. Due to long-term exposure to the external environment, overhead pipelines require effective corrosion protection measures, such as painting and galvanizing. Similarly, vertical pipelines can also be part of an overhead pipeline system, especially when connecting facilities at different heights, such as transporting liquids or gases from one horizontal plane to another higher or lower horizontal plane. Because vertical pipelines are also exposed to the environment, corrosion protection and safety measures are necessary.

[0004] For corrosion protection of the outer walls of long-distance overhead or vertical pipelines, the commonly used methods are manual brush application or air compressor spraying. However, the safety measures required, such as scaffolding erection, involve a large amount of work, are slow, and are time-consuming and labor-intensive. Therefore, it is necessary to design a pipeline outer wall spraying device. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, this utility model provides a pipeline outer wall spraying device to solve the problem of rapid anti-corrosion spraying of the outer wall of overhead long-distance pipelines or vertical pipelines, and to meet the requirements of pipeline outer wall painting.

[0006] To achieve the above and other related objectives, this utility model provides a pipe outer wall spraying device, comprising:

[0007] Crawler body 1;

[0008] Drive mechanism 2 is mounted on crawler body 1 and contacts the outer wall of the pipe to drive crawler body 1 to move along its axial direction on the outer wall of the pipe.

[0009] The spraying mechanism 3 comprises a pair of semicircular nozzle supports 31, a pair of support rotating mechanisms 32 and a pair of rotating shafts 33, each nozzle support 31 is uniformly provided with a nozzle 311, the first end 312 of each nozzle support 31 is connected with the second end 332 of the corresponding rotating shaft 33, the first end 331 of the rotating shaft 33 is rotationally connected with the crawler body 1, the support rotating mechanism 32 drives the corresponding rotating shaft 33 to rotate, thereby driving the corresponding nozzle support 31 to rotate around the first end 312, so as to realize the closing or opening of the pair of first ends 312 and the pair of second ends 313 of the pair of nozzle supports 31.

[0010] As one of the embodiments of the utility model, each support rotating mechanism 32 comprises an electric telescopic cylinder 321 and a gear and a toothed plate engaged with each other, a gear is sleeved on each rotating shaft 33, a toothed plate is installed on the piston rod of the corresponding electric telescopic cylinder 321, and the toothed plate is arranged along the length direction of the piston rod; when the electric telescopic cylinder 321 works, the toothed plate telescopes, drives the rotating shaft 33 to rotate through the gear transmission.

[0011] As one of the embodiments of the utility model, the end of the first end 331 of each rotating shaft 33 is a bent part, and the pair of bent parts of the pair of rotating shafts 33 are close to each other when the pair of first ends 312 of the pair of nozzle supports 31 are closed, and the pair of bent parts are away from each other when the pair of first ends 312 of the pair of nozzle supports 31 are opened.

[0012] As one of the embodiments of the utility model, the crawler body 1 is a cube, the length direction of the cube is consistent with the axial direction of the pipeline, and the bottom surface of the cube is provided with four support legs 11 at the corresponding four right-angled positions, respectively, each support leg 11 is provided with an elastic mounting plate 12 at the rotating end, and each elastic mounting plate 12 is provided with a friction roller 13.

[0013] As one of the embodiments of the utility model, each elastic mounting plate 12 is arranged to be inclined with respect to the support leg 11, so that the corresponding pair of elastic mounting plates of the first end 14 or the second end 15 of the crawler body 1 are inclined and close to each other, and the opposite sides of the pair of elastic mounting plates are respectively provided with friction rollers 13, so that the four elastic mounting plates 12 of the crawler body are arranged on the outer wall of the pipeline, and each friction roller 13 is in rolling contact with the outer wall of the pipeline.

[0014] As one of the embodiments of the utility model, the driving mechanism 2 comprises a roller mechanism, the roller mechanism comprises a driving roller mechanism 21 and a transmission roller 22, the driving roller mechanism 21 and the transmission roller 22 are installed at the first end 14 and the second end 15 of the crawler body 1, respectively, the driving roller mechanism 21 comprises a driving motor 211 and a pair of driving rollers 212, the driving motor 211 drives the pair of driving rollers 212 to rotate through a gear transmission mechanism 213.

[0015] As one of the embodiments of the utility model, the axial direction of the transmission roller 22 is consistent with the width direction of the crawler body 1; a pair of driving rollers 212 of the driving roller mechanism 21 are installed at the second end 15 of the crawler body 1 in a spaced manner, the driving motor 211 is installed between the pair of driving rollers 212, and the axial direction of the pair of driving rollers 212 is located in the same width direction of the crawler body 1.

[0016] As one of the embodiments of the utility model, the gear transmission mechanism 213 comprises a first transmission gear set 2131 and a second transmission gear set 2132, the first transmission gear set 2131 is engaged with the output shaft gear 2111 of the driving motor 211 and the roller shaft gear 2121 of one of the driving rollers 212 respectively, the second transmission gear set 2132 is coaxially connected with the first transmission gear set 2131, and the second transmission gear set 2132 is engaged with the roller shaft gear 2121 of the other driving roller 212.

[0017] As one of the embodiments of the utility model, the first transmission gear set 2131 and the second transmission gear set 2132 respectively comprise at least two spur gears 2133 engaged with each other.

[0018] As one of the embodiments of the utility model, the spraying mechanism 3 further comprises a pair of paint tanks 34 and a pair of gear pumps 35, adjacent nozzles 311 on each nozzle support 31 are communicated through a spray pipe, each paint tank 34 is communicated through a paint conveying pipe 36 through the import of the corresponding gear pump 35 and the corresponding spray pipe.

[0019] The utility model has at least the following beneficial technical effects:

[0020] The utility model discloses a pipeline outer wall spraying device, including crawler body, drive mechanism and spraying mechanism, wherein, spraying mechanism includes a pair of half -round nozzles support, a pair of support rotation mechanism and a pair of rotating shafts, each nozzle support is uniformly provided with the nozzle, the first end of each nozzle support and the first end of corresponding rotating shaft are connected, and the second end of rotating shaft is rotatably connected with crawler body, a pair of support rotation mechanism drives a pair of nozzle support to rotate through corresponding pair of rotating shafts, realizes a pair of first end and a pair of second end of a pair of nozzle support simultaneously closing or separating. When a pair of first end and a pair of second end of a pair of nozzle support simultaneously close, form circular ring support, and circular ring support is set in the pipeline outer wall, drive mechanism drives crawler body to move on the pipeline outer wall and along its axial direction, and the nozzle is overall sprayed to the pipeline outer wall, and along with the movement of crawler body, can move along the axial movement of long pipeline or vertical pipeline, carries out the spraying work of pipeline outer wall, satisfies the requirement of pipeline outer wall paint spraying use. When a pair of first end and a pair of second end of a pair of nozzle support simultaneously separate, the above-mentioned circular ring support separates from the middle, when a pair of nozzle support can be taken off from the pipeline, the spraying pipeline or nozzle support or nozzle etc. are replaced, therefore the utility model discloses a pipeline outer wall spraying device uses and its maintenance are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a structural schematic diagram of the pipeline outer wall spraying device provided by the utility model one embodiment;

[0022] Fig. 2 It is a structural schematic diagram of the spraying mechanism of the pipeline outer wall spraying device provided by the utility model one embodiment;

[0023] Fig. 3 It is the drive mechanism structural schematic diagram of the pipeline outer wall spraying device provided by the utility model one embodiment.

[0024] Element symbol explanation:

[0025] Crawler body 1, drive mechanism 2, spraying mechanism 3, nozzle support 31, support rotation mechanism 32, rotation shaft 33, nozzle 311, first end 331 of rotation shaft 33, second end 332 of rotation shaft 33, first end 312 and second end 313 of nozzle support 31, electric telescopic cylinder 321, support leg 11, elastic mounting plate 12, friction roller 13, first end 14 of crawler body 1, second end 15 of crawler body 1, drive roller mechanism 21, transmission roller 22, drive motor 211, drive roller 212, gear transmission mechanism 213, first transmission gear set 2131, second transmission gear set 2132, output shaft gear 2111, roller shaft gear 2121, spur gear 2133, shaft mounting bracket 2134, first toothed shaft 2135, second toothed shaft 2136, paint tank 34, gear pump 35, paint delivery pipe 36. DETAILED DESCRIPTION

[0026] The above and other advantages and effects of the present application will become readily apparent to those skilled in the art from the following description in conjunction with the accompanying drawings. The present application can be carried out by one of ordinary skill in the art without departing from the spirit and essential characteristics of the present application. Any embodiment and feature stated in the present application can be replaced by alternative embodiment and feature without departing from the scope of the present application. The terms used in the present application are intended to describe particular embodiments and are not intended to limit the scope of the present application. Unless otherwise defined, the test methods used in the following examples were conducted under conventional conditions or under the conditions recommended by the manufacturer.

[0027] Please refer to Figs. 1 to 3 It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present application are merely intended to illustrate the content disclosed in the present application, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" used in the present application are merely for the convenience of clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0028] When the embodiments give a numerical range, it should be understood that, unless otherwise stated by the utility model, each numerical range of two endpoints and any one numerical between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the utility model are used by the skilled in the art of the present technology and the description of the utility model, and any method, equipment and material of the prior art similar or equivalent to the method, equipment and material in the embodiments of the utility model can be used to realize the utility model.

[0029] Please refer to Fig. 1 and Fig. 2 To achieve the above object and other related purposes, the utility model provides a pipeline outer wall spraying device, including crawler body 1, drive mechanism 2 and spraying mechanism 3, drive mechanism 2 is installed on crawler body 1, and contacts the pipeline outer wall, to drive crawler body 1 on the pipeline outer wall along its axial movement;Spraying mechanism 3 includes a pair of half-round nozzle support 31, a pair of support rotation mechanism 32 and a pair of rotating shaft 33, each nozzle support 31 is uniformly provided with nozzle 311, the first end 312 of each nozzle support 31 and the second end 332 of the corresponding rotating shaft 33 are connected, the first end 331 of rotating shaft 33 and crawler body 1 are rotationally connected, support rotation mechanism 32 drives the corresponding rotating shaft 33 to rotate, and then drives the corresponding nozzle support 31 to rotate around its first end 312, to realize that a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are closed or separated.

[0030] Spraying mechanism 3 further includes a pair of paint tanks 34 and a pair of gear pumps 35, adjacent nozzles 311 on each nozzle support 31 are communicated through a spray pipe, and each paint tank 34 is communicated through a paint delivery pipe 36 by the inlet of the corresponding spray pipe through the gear pump 35. A pair of paint tanks 34 and a pair of gear pumps 35 can be arranged in the internal accommodation cavity of the crawler body 1.

[0031] The above-mentioned pipeline outer wall spraying device, when a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are closed simultaneously, a circular ring-shaped support is formed, and the circular ring-shaped support is sleeved on the pipeline outer wall, at this time, drive mechanism 2 drives crawler body 1 to move on the pipeline outer wall and along its axial movement, nozzle 311 is fully sprayed to a week of the pipeline outer wall, and can move along the axial movement of long pipeline or vertical pipeline along with the movement of crawler body 1, to carry out the spraying work of the whole pipeline outer wall, when a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are separated simultaneously, the circular ring-shaped support is separated from the middle, at this time, a pair of nozzle supports 31 can be taken off from the pipeline, to facilitate the replacement of spraying pipeline or nozzle support 31 or nozzle, etc., so as to solve the problem of rapid anticorrosion spraying of the outer wall of overhead long pipeline or vertical pipeline, meet the requirements of pipeline outer wall paint spraying, and convenient to use and maintain.

[0032] As one of the embodiments of the utility model, each support rotating mechanism 32 includes electric telescopic cylinder 321, and gear and toothed plate (not shown in the figure) engaged with each other, gear is sleeved on each rotating shaft 33, toothed plate is installed on the piston rod of corresponding electric telescopic cylinder 321, and toothed plate is arranged along the length direction of piston rod; when electric telescopic cylinder 321 works, toothed plate telescopic motion is driven to rotate rotating shaft 33 through gear transmission. The end of the first end 331 of each rotating shaft 33 is bent, and the pair of bent portions of the pair of rotating shafts 33 are close to each other when the pair of first ends 312 of the pair of nozzle supports 31 are closed, and the pair of bent portions are away from each other when the pair of first ends 312 of the pair of nozzle supports 31 are separated.

[0033] It should be noted that the pair of rotating shafts 33 can rotate 180° in opposite directions to realize the closing or separation of the pair of first ends 312 and the pair of second ends 313 of the pair of nozzle supports 31, for example, the pair of rotating shafts 33 are a first rotating shaft and a second rotating shaft, when the first rotating shaft rotates counterclockwise by 90° and the second rotating shaft rotates clockwise by 90°, the pair of first ends 312 and the pair of second ends of the pair of nozzle supports 31 are in a closed state at the same time, forming a circular support, at this time, the pair of bent portions of the pair of rotating shafts 33 are close to each other, and the circular support is sleeved on the outer wall of the pipeline. Then, the first rotating shaft rotates clockwise by 90°, and the second rotating shaft rotates counterclockwise by 90°, at this time, the circular support is separated from the middle, that is, the circular support is removed from the outer wall of the pipeline, at this time, the pair of bent portions of the pair of rotating shafts 33 are away from each other. The angle of rotation of the first rotating shaft and the second rotating shaft can be adjusted as needed, and at the same time, the pair of nozzle supports 31 can be made of plastic material, and the shape thereof can be adjusted to adapt to and correspond to the adjustment needs of the relative position of the outer wall of the pipeline.

[0034] It should be noted that the above-mentioned gear and toothed plate (not shown in the figure) are arranged to convert the linear motion of the electric telescopic cylinder 321 into the rotation of the corresponding rotating shaft 33, so any other structure device can be used instead of the gear and toothed plate to realize the rotating motion of the rotating shaft 33.

[0035] As one of the embodiments of the utility model, the crawler body 1 is a cube, the length direction of the cube is consistent with the axial direction of the pipeline, and the bottom surface of the cube is provided with four support legs 11 at the corresponding four right-angled positions, respectively. The rotating end of each support leg 11 is provided with an elastic mounting plate 12, and each elastic mounting plate 12 is provided with a friction roller 13. Each elastic mounting plate 12 is inclinedly arranged corresponding to the support leg 11, so that the corresponding pair of elastic mounting plates of the first end 14 or the second end 15 of the crawler body 1 are inclinedly close, and the opposite sides of the pair of elastic mounting plates are respectively provided with friction rollers 13, so that the four elastic mounting plates 12 of the crawler body are clamped on the outer wall of the pipeline, and each friction roller 13 and the outer wall of the pipeline are in rolling contact.

[0036] Please refer to Fig. 3 As one of the embodiments of the utility model, the driving mechanism 2 comprises a drum mechanism, the drum mechanism comprises a driving drum mechanism 21 and a transmission drum 22, the driving drum mechanism 21 and the transmission drum 22 are arranged at the first end 14 and the second end 15 of the crawler body 1 respectively, the driving drum mechanism 21 comprises a driving motor 211 and a pair of driving drums 212, the driving motor 211 drives the pair of driving drums 212 to rotate through a gear transmission mechanism 213.The transmission drum 22 is installed at the first end 14 of the crawler body 1, and the axial direction of the transmission drum 22 is consistent with the width direction of the crawler body 1;The pair of driving drums 212 of the driving drum mechanism 21 are spaced apart and arranged at the second end 15 of the crawler body 1, and the axial direction of the pair of driving drums 212 is located in the same width direction of the crawler body 1.

[0037] The driving mechanism 2 can be a drum mechanism or other driving mechanism that can realize the movement of the crawler body 1 along the axial direction of the pipeline, for example, the friction roller 13 is provided as a motor-driven wheel.

[0038] The gear transmission mechanism 213 comprises a first transmission gear set 2131 and a second transmission gear set 2132, the first transmission gear set 2131 is engaged with the output shaft gear 2111 of the driving motor 211 and the drum shaft gear 2121 of one of the driving drums 212 respectively, the second transmission gear set 2132 is coaxially connected with the first transmission gear set 2131, and the second transmission gear set 2132 is engaged with the drum shaft gear 2121 of the other driving drum 212.The first transmission gear set 2131 and the second transmission gear set 2132 respectively comprise at least two spur gears 2133 that are engaged with each other.

[0039] It should be noted that the transmission drum 22 is rotatably installed at the first end 14 of the crawler body 1 through a bearing. The ends of the pair of driving drums 212 away from each other are rotatably installed at the second end 15 of the crawler body 1 through a bearing respectively, and the ends of the pair of driving drums 212 close to each other are respectively provided with drum shaft gears 2121. The pair of driving drums 212 are a first driving drum and a second driving drum, the first transmission gear set 2131 comprises two spur gears 2133 that are engaged with each other, which are a first spur gear and a second spur gear, wherein the first spur gear is engaged with the drum shaft gear 2121 of the first driving drum, and the second spur gear is engaged with the output shaft gear 2111, so that the driving motor 211 drives the first driving drum to rotate.

[0040] The second transmission gear set 2132 comprises two intermeshing straight gears 2133, namely a third straight gear and a fourth straight gear, the first straight gear and the third straight gear are installed on a first gear shaft 2135, and the second straight gear and the fourth straight gear are installed on a second gear shaft 2136. The first straight gear and the second straight gear rotate to drive the third straight gear and the fourth straight gear to rotate respectively, the fourth straight gear is meshed with the drum shaft gear 2121, so that the pair of driving drums 212 rotate in the same direction under the driving of the driving motor 211. The pair of drum shafts of the pair of driving drums 212, the first gear shaft 2135 and the second gear shaft 2136 can be installed on the corresponding crawler body 1 through the shaft installation support 2134.

[0041] In summary, the pipeline outer wall spraying device of the utility model, when a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are closed at the same time, a circular ring-shaped support is formed, and the circular ring-shaped support is sleeved on the pipeline outer wall. At this time, the driving mechanism 2 drives the crawler body 1 to move on the pipeline outer wall and along the axial direction thereof, the nozzle 311 sprays the entire circumference of the pipeline outer wall, and along with the movement of the crawler body 1, the axial movement along the long-distance pipeline or the vertical pipeline can be realized, and the overall spraying work of the pipeline outer wall can be carried out. When a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are separated at the same time, the circular ring-shaped support is separated from the middle. Since the end part of the first end 331 of each rotating shaft 33 is a bending part, the bending part and the rotating shaft 33 are integrally formed or fixedly connected, the pair of bending parts of the pair of rotating shafts 33 are close to each other when the pair of first ends 312 of the pair of nozzle supports 31 are closed, and the pair of bending parts are away from each other when the pair of first ends 312 of the pair of nozzle supports 31 are separated. Therefore, when a pair of first ends 312 and a pair of second ends 313 of a pair of nozzle supports 31 are separated at the same time, the distance between the pair of second ends 313 of the pair of nozzle supports 31 is greater than the distance between the pair of first ends 312, which facilitates the extraction or entry of the pipeline into the circular ring-shaped support. Therefore, the utility model solves the problem of rapid corrosion prevention and spraying of the outer wall of the overhead long-distance pipeline or the vertical pipeline, meets the requirements of pipeline outer wall paint spraying, and is convenient to use and maintain.

[0042] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A pipe exterior wall spraying device characterized by, The utility model relates to a pipeline crawler spraying device, which comprises: a crawler body (1); a driving mechanism (2) mounted on the crawler body (1) and in contact with the outer wall of the pipeline to drive the crawler body (1) to move along the axial direction of the pipeline; a spraying mechanism (3) comprising a pair of semicircular nozzle holders (31), a pair of holder rotating mechanisms (32) and a pair of rotating shafts (33), each nozzle holder (31) being uniformly provided with nozzles (311), the first end (312) of each nozzle holder (31) being connected to the second end (332) of the corresponding rotating shaft (33), the first end (331) of the rotating shaft (33) being rotatably connected to the crawler body (1), and the holder rotating mechanism (32) driving the corresponding rotating shaft (33) to rotate, thereby driving the corresponding nozzle holder (31) to rotate around the first end (312) thereof to achieve the folding or separation of the pair of first ends (312) and the pair of second ends (313) of the pair of nozzle holders (31).

2. The pipe exterior wall spraying apparatus according to claim 1, characterized by, Each holder rotating mechanism (32) comprises an electric telescopic cylinder (321) and a gear and a toothed plate in engagement, the gear being sleeved on each rotating shaft (33), the toothed plate being mounted on the piston rod of the corresponding electric telescopic cylinder (321) and being arranged along the length direction of the piston rod, and the electric telescopic cylinder (321) driving the toothed plate to perform telescopic movement when the electric telescopic cylinder (321) is working, the gear being driven to rotate and the rotating shaft (33) being driven to rotate.

3. The pipe exterior wall spraying apparatus according to claim 2, characterized by, The end of the first end (331) of each rotating shaft (33) is a bent portion, and the pair of bent portions are close to each other when the pair of first ends (312) of the pair of nozzle holders (31) are folded, and the pair of bent portions are away from each other when the pair of first ends (312) of the pair of nozzle holders (31) are separated.

4. The pipe exterior wall spraying apparatus according to claim 1, characterized by The crawler body (1) is a cuboid, the length direction of the cuboid is consistent with the axial direction of the pipeline, and four support legs (11) are arranged at the corresponding four right-angled corners of the bottom surface of the cuboid, respectively, each support leg (11) being provided with an elastic mounting plate (12) at the rotating end thereof, and a friction roller (13) being mounted on each elastic mounting plate (12).

5. The pipe exterior wall spraying apparatus according to claim 4, wherein Each elastic mounting plate (12) is arranged to be inclined to the corresponding support leg (11), so that the pair of elastic mounting plates corresponding to the first end (14) or the second end (15) of the crawler body (1) are inclined to be close to each other, and the friction rollers (13) are arranged on the opposite sides of the pair of elastic mounting plates, respectively, so that the four elastic mounting plates (12) of the crawler body are arranged on the outer wall of the pipeline, and each friction roller (13) is in rolling contact with the outer wall of the pipeline.

6. The pipe exterior wall spraying apparatus according to claim 5, wherein The driving mechanism (2) comprises a drum mechanism, the drum mechanism comprises a driving drum mechanism (21) and a transmission drum (22), the driving drum mechanism (21) and the transmission drum (22) are respectively installed at the first end (14) and the second end (15) of the crawler body (1), the driving drum mechanism (21) comprises a driving motor (211) and a pair of driving drums (212), the driving motor (211) drives the pair of driving drums (212) to rotate through a gear transmission mechanism (213).

7. The pipe exterior wall spraying apparatus according to claim 6, wherein The axial direction of the transmission drum (22) is consistent with the width direction of the crawler body (1); the pair of driving drums (212) of the driving drum mechanism (21) are installed at the second end (15) of the crawler body (1) in a spaced manner, the driving motor (211) is installed between the pair of driving drums (212), and the axial direction of the driving drum (212) is located in the same width direction of the crawler body (1).

8. The pipe exterior wall spraying apparatus according to claim 7, wherein The gear transmission mechanism (213) comprises a first transmission gear set (2131) and a second transmission gear set (2132), the first transmission gear set (2131) is respectively engaged with the output shaft gear (2111) of the driving motor (211) and the drum shaft gear (2121) of the corresponding driving drum (212), the second transmission gear set (2132) is coaxially connected with the first transmission gear set (2131), and the second transmission gear set (2132) is engaged with the drum shaft gear (2121) of the other driving drum (212).

9. The pipe exterior wall spraying apparatus according to claim 8, wherein The first transmission gear set (2131) and the second transmission gear set (2132) respectively comprise at least two spur gears (2133) engaged with each other.

10. The pipe exterior wall spraying apparatus according to claim 1, wherein The spraying mechanism (3) further comprises a pair of paint tanks (34) and a pair of gear pumps (35), each adjacent nozzle (311) on the nozzle support (31) is communicated through a spray pipe, and each paint tank (34) is communicated with the corresponding spray pipe inlet through a paint conveying pipe (36) through the corresponding gear pump (35).

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