Crawling spraying device with compact structure

Abstract

The utility model relates to the technical field of spraying devices, and particularly discloses a crawling spraying device with a compact structure, which can be applied to the spraying operation of the inner and outer surfaces of a steel pipe, when a crawling device circumferentially crawl along the inner wall surface or the outer wall surface of the steel pipe, the wall surface of the steel pipe can be heated through a first heating module, and the crawling device continuously moves along with the crawling device. The driving mechanism can drive the spraying mechanism to move to the position above the wall face of the heated steel pipe, so that hot melting or thermosetting powder is sprayed to the wall face of the heated steel pipe. The processing area is formed in the middle of the machine body frame, and the heating mechanism and the spraying mechanism are both arranged in the processing area, so that the heating mechanism and the spraying mechanism are located in the middle of the advancing direction of the crawler, and compared with an existing side arm type structure, the structure is more compact, and the heating mechanism and the spraying mechanism are directly installed on the machine body frame; and the situation of shaking can be avoided, and the stability is better.

Description

Technical Field

[0001] This utility model relates to the field of spraying device technology, and in particular to a compact crawling spraying device. Background Technology

[0002] After the steel pipe is manufactured, anti-corrosion treatment is usually applied to the inner and outer walls of the steel pipe. However, a 150mm length is reserved at the weld joints at both ends of the steel pipe for temporary anti-corrosion or no anti-corrosion treatment is applied. During the welding process after on-site connection, the temporary anti-corrosion treatment near the weld joint is removed. After the welding is completed and the inspection is passed, anti-corrosion treatment is carried out.

[0003] For steel pipes using hot-melt or thermosetting spraying for corrosion protection, the lack of on-site conditions for performing these coatings hinders their widespread application. Traditionally, the application of hot-melt or thermosetting spraying coatings to on-site weld joints of steel pipes typically involves two-component paints, which reduces the quality of corrosion protection at the weld joints, prolongs the protection time, and severely impacts the overall pipeline quality and project schedule.

[0004] The new process currently employs equipment for applying anti-corrosion coatings to the inner and outer walls of pipes via a crawling spraying method. A similar device can be found in Chinese Patent Publication No. CN221245661U, which discloses a crawling spraying apparatus comprising a spray gun, a high-frequency heater, an induction coil electrically connected to the high-frequency heater, a crawler, and a controller. By installing the spray gun and induction coil on a crawler capable of circumferentially crawling along the wall of a large-diameter steel pipe, when steel pipes are welded together and anti-corrosion treatment is required on the outer wall near the pipe opening, the crawling spraying apparatus can be used to spray hot-melt or thermosetting powder onto the inner and outer walls of the steel pipe.

[0005] Existing crawling spraying devices have the following problems: 1. The spray gun and induction coil are located on one side of the crawler, resulting in a large overall size. To improve the structural strength of existing steel pipes, reinforcing rings are installed on the outer wall. If these reinforcing rings are too close together at the weld, the existing crawling spraying device may not be able to be placed on the outer wall of the pipe, resulting in limited working space. 2. Existing steel pipes are made by rolling steel plates and then welding them together. Therefore, there are welds along the axial direction of the pipe wall. When the crawler moves circumferentially to the axial weld, the uneven weld can cause the crawler to vibrate. Since the spray gun and induction coil of existing crawling sprayers are mounted on a lateral extension arm, vibration during crawling will also cause the spray gun and induction coil to vibrate, leading to uneven spraying.

[0006] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a compact crawling spraying device to solve the problems of large size and swaying of spray gun and induction coil caused by the extension arm structure of the prior art crawling spraying device.

[0008] A compact crawling spraying device includes:

[0009] The crawler includes a body frame and movable components fixed to the left and right ends of the body frame, with a processing area formed in the middle of the body frame;

[0010] The heating mechanism includes a first heating module that is located on the front or inner side of the processing area and is height-adjustable;

[0011] The spraying mechanism, located behind the heating mechanism in the direction of movement, includes a guide rail fixed to the machine frame, a spray gun that slides along the guide rail in the left-right direction, and a translation drive device for driving the spray gun to reciprocate in the left-right direction. The nozzle of the spray gun faces the processing area.

[0012] Specifically, the moving component includes a traveling trolley fixed to the left and right sides of the fuselage frame.

[0013] Specifically, the heating mechanism further includes a lifting assembly for adjusting the height of the first heating module. The lifting assembly includes a mounting base fixed to the body frame, a first lifting drive device disposed on the mounting base, and a frame connected to the output end of the first lifting drive device. The first heating module is fixed to the frame.

[0014] Specifically, the first lifting drive device is a screw adjuster, a pneumatic lifting device, a hydraulic lifting device, or an electric lifting device.

[0015] Specifically, the crawling spraying device also includes a heating mechanism, which is located between the heating mechanism and the heating mechanism.

[0016] Specifically, the temperature compensation mechanism includes a second heating module located behind the spraying mechanism and with adjustable height.

[0017] Specifically, the heating mechanism also includes a second lifting drive device connected to the body frame and used to adjust the height of the second heating module.

[0018] Specifically, the second lifting drive device is a screw adjuster, a pneumatic lifting device, a hydraulic lifting device, or an electric lifting device.

[0019] The beneficial effects of this utility model are:

[0020] This invention relates to a crawling spraying device, which can be applied to the spraying of the inner and outer surfaces of steel pipes. When the crawler crawls circumferentially along the inner or outer wall of the steel pipe, the wall of the steel pipe can be heated by the first heating module. As the crawler continues to move, it can drive the spraying mechanism to move above the wall of the heated steel pipe, thereby spraying hot melt or hot solid powder onto the inner or outer wall surface of the heated steel pipe. Moreover, a processing area is formed in the middle of the machine frame, and the heating mechanism and the spraying mechanism are both set in the processing area, so that the heating mechanism and the spraying mechanism are located in the middle of the crawler's travel direction. Compared with the existing side-arm structure, the structure is more compact, and the heating mechanism and the spraying mechanism are directly installed on the machine frame, which can avoid shaking and improve stability. Attached Figure Description

[0021] Figure 1 The three-dimensional representation of the crawling spraying device in Example 1 Figure 1 ;

[0022] Figure 2 The three-dimensional representation of the crawling spraying device in Example 1 Figure 2 ;

[0023] Figure 3 This is a top view of the crawling spraying device of Example 1;

[0024] Figure 4 This is a rear view of the crawling spraying device of Example 1;

[0025] Figure 5 for Figure 4 A sectional view along line AA.

[0026] Figure 6 This is a perspective view of the mounting base and the first lifting drive device in Embodiment 1;

[0027] Figure 7 This is a perspective view of the mounting base and the first lifting drive device in Embodiment 2;

[0028] Figure 8 This is a top view of the crawling spraying device of Example 3;

[0029] Figure 9 This is a top view of the crawling spraying device of Example 4.

[0030] The attached figures are labeled as follows: crawler 10, body frame 11, moving component 12, processing area 13, heating mechanism 20, first heating module 21, spraying mechanism 30, guide rail 31, spray gun 32, translation drive device 33, control box 121, caster frame 122, walking wheel 123, drive wheel 125, magnetic component 124, lifting component 22, mounting base 221, first lifting drive device 222, frame 223, heat replenishment mechanism 40, second heating module 41, second lifting drive device 42. Detailed Implementation

[0031] This utility model provides a compact crawling spraying device. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes the utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0032] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Example 1

[0034] Please refer to Figures 1-6 As shown, this embodiment discloses a compact crawling spraying device, comprising:

[0035] The crawler 10 includes a body frame 11 and moving components 12 fixed to the left and right ends of the body frame 11. A processing area 13 is formed in the middle of the body frame 11.

[0036] The heating mechanism 20 includes a first heating module 21 that is located on the front or inside of the processing area 13 and is height adjustable;

[0037] The spraying mechanism 30 is located behind the heating mechanism 20 in the direction of movement. It includes a guide rail 31 fixed to the machine frame 11, a spray gun 32 that slides along the guide rail 31 in the left and right direction, and a translation drive device 33 for driving the spray gun 32 to reciprocate in the left and right direction. The nozzle of the spray gun 32 faces the processing area 13.

[0038] The crawling spraying device of this embodiment can be applied to the spraying of the inner and outer surfaces of steel pipes. When the crawler 10 crawls circumferentially along the inner or outer wall of the steel pipe, the inner or outer wall of the steel pipe can be heated by the first heating module 21. After the wall of the steel pipe is heated, as the crawler 10 continues to move, it can drive the spraying mechanism 30 to move above the wall of the heated steel pipe, thereby spraying the wall of the heated steel pipe with hot melt or hot-setting powder. Therefore, when two steel pipes are welded together and it is necessary to perform anti-corrosion treatment on the part of the outer wall of the steel pipe near the pipe opening, the crawling spraying device provided in this embodiment can be used to spray hot melt or hot-setting powder onto the outer wall of the steel pipe. The crawler 10 crawls onto the outer wall of the steel pipe, and the spray gun 32 of the spraying mechanism 30 and the first heating module 21 are both facing the part of the steel pipe wall near the pipe opening, thereby enabling the part of the steel pipe wall near the pipe opening to be quickly sprayed with hot melt or hot-setting powder. Because hot-melt or thermosetting powder can quickly solidify upon contact with the heated steel pipe wall, and the resulting hot-melt or thermosetting powder coating can be firmly bonded to the outer wall of the steel pipe, once the area connecting two steel pipes is coated, the welded and anti-corrosion steel pipe can be pushed into the tunnel by a tunnel boring machine without waiting for a long time. Furthermore, the hot-melt or thermosetting powder coating on the steel pipe wall will not be scraped off by the tunnel wall, and the part of the steel pipe wall near the pipe opening can maintain excellent anti-corrosion performance.

[0039] Furthermore, in this embodiment, by hollowing out the middle of the body frame 11, a processing area 13 is formed in the middle of the body frame 11, and the heating mechanism 20 and the spraying mechanism 30 are both set in the processing area 13, so that the heating mechanism 20 and the spraying mechanism 30 are located in the middle position of the crawler 10 in the direction of travel. Compared with the existing side arm structure, the structure is more compact, and the heating mechanism 20 and the spraying mechanism 30 are directly installed on the body frame 11, which can avoid shaking and improve stability.

[0040] Furthermore, the spraying mechanism 30 of this embodiment adopts a single spray gun 32 structure. Compared with the existing multi-nozzle structure, it can simplify the structure of the spraying part and make the overall structure more compact. Moreover, the spray gun 32 is set on the guide rail 31. One end of the spray gun 32 is the nozzle, and the other end is connected to the hot melt or thermosetting powder supply box through the pipe. The hot melt or thermosetting powder supply box provides hot melt or thermosetting powder to the spray gun 32.

[0041] Furthermore, in this embodiment, the spray gun 32 is driven to reciprocate in the left and right direction by the translation drive device 33. During the spraying process, the hot melt or thermosetting powder can be evenly coated on the outer wall of the steel pipe. By adopting the reciprocating spraying method, the coating uniformity is better and the spraying width and thickness are easier to control.

[0042] Furthermore, the travel of the spray gun 32 in the left and right direction can be controlled by the translation drive device 33, thereby controlling the spraying width of the hot melt or thermosetting powder in the left and right direction. In this embodiment, the translation drive device 33 adopts a ball screw, which can accurately control the travel and ensure the consistency of the spraying width.

[0043] Of course, in other embodiments, the translation drive device 33 may also adopt linear modules such as synchronous belts, electric push rods, and electric cylinders, and is not limited to the ball screw of this embodiment.

[0044] For further details, please refer to... Figure 2 In this embodiment, the mobile component 12 includes a traveling trolley fixed to the left and right sides of the body frame 11, and a control box 121 is fixed on the traveling trolley.

[0045] The mobile trolley includes caster frames 122 connected to the front and rear ends of the control box 121, rotatable wheels 123 and drive wheels 125 rotatably mounted at both ends of the caster frames 122. The mobile assembly 12 can be front-wheel drive, rear-wheel drive, or four-wheel drive. When the mobile assembly 12 is front-wheel drive, the drive wheels 125 are located at the front end of the caster frame 122. When the mobile assembly 12 is rear-wheel drive, the drive wheels 125 are located at the rear end of the caster frame 122. When the mobile assembly 12 is four-wheel drive, drive wheels 125 are provided at both the front and rear ends of the caster frame 122, that is, at least one set of wheels in the front-rear direction. As the drive wheel 125, the drive wheel 125 can be controlled to rotate by a servo motor. The servo motor has higher control precision and response speed. Through a dedicated controller, precise forward and reverse rotation control can be achieved. When the steel pipe has a problem of poor coating at the end of the stroke, the drive wheel 125 can be controlled to rotate in reverse by the servo motor, so that the coating mechanism 30 returns to the position of poor coating and re-coating. This ensures that all parts of the steel pipe surface are covered with hot melt or thermosetting coating, thereby avoiding the subsequent corrosion and rust problems caused by poor coating.

[0046] Furthermore, the walking trolley also includes a magnetic component 124, which can be a permanent magnet. Through magnetic adsorption, the moving component 12 can be adsorbed onto the wall of the steel pipe, increasing the attractive force of the walking trolley and making it easier to walk on the surface of the steel pipe.

[0047] In a preferred embodiment, the magnetic component 124 is installed at the positions of the walking wheel 123 and the drive wheel 125. Of course, in other embodiments, the magnetic component 124 can also be installed at the bottom of the caster frame 122, the bottom of the control box 121, etc., and is not limited to the positions of the walking wheel 123 and the drive wheel 125.

[0048] The height of the first heating module 21 in this embodiment is adjustable, so that the distance between the first heating module 21 and the steel pipe wall can be adjusted according to the outer diameter of the steel pipe, so that the first heating module 21 can achieve the best heating effect on the steel pipe wall. When the hot melt or hot solid powder is sprayed on the steel pipe wall, a uniform coating can be formed, which can effectively protect the steel pipe wall.

[0049] For further details, please refer to... Figure 1 The heating mechanism 20 in this embodiment also includes a lifting component 22 for adjusting the height of the first heating module 21. The lifting component 22 includes a mounting base 221 fixed to the body frame 11, a first lifting drive device 222 disposed on the mounting base 221, and a frame 223 connected to the output end of the first lifting drive device 222. The first heating module 21 is fixed to the frame 223, and the height of the first heating module 21 can be adjusted by the first lifting drive device 222. The structure is simple and the adjustment is easy.

[0050] Instead of directly fixing the first heating module 21 to the output end of the first lifting drive device 222, a frame 223 is set up, and the first heating module 21 is fixed to the frame 223. The function of the frame 223 is that a transformer for controlling the voltage of the first heating module 21 can be installed on the top of the frame 223, as well as a clamp for fixing the line or pipe.

[0051] For further details, please refer to... Figures 4 to 6 In this embodiment, the first lifting drive device 222 is a manually adjustable component, specifically a screw adjusting component. The screw adjusting component includes a screw, a screw sleeve that cooperates with the screw, a movable plate that is fixedly connected to the screw sleeve, and a handle connected to the upper end of the screw. The movable plate is also fixedly connected to the frame 223 by bolts. When it is necessary to adjust the height of the first heating module 21, the operator can rotate the screw through the handle. Since the screw and the screw sleeve are threadedly engaged, the movable plate is driven to move up and down. The movable plate drives the frame 223 and the first heating module 21 to move up and down, thereby realizing the position adjustment of the first heating module 21 in the vertical direction. The structure is simple and the operation is easy.

[0052] It should be noted that the first lifting drive device 222 in this embodiment is a manually adjustable component, which is only a preferred implementation. In other embodiments, the first lifting drive device 222 may also be a pneumatic lifting device, a hydraulic lifting device, or an electric lifting device.

[0053] Please refer to Figure 2 and Figure 3In this embodiment, the first heating module 21 adopts a vortex coil and utilizes the principle of magnetic field induction eddy current heating. When current passes through the first heating module 21, a magnetic field is generated. When the magnetic force in the magnetic field passes through the steel pipe, the steel pipe is heated through the eddy current effect, thereby achieving the effect of heating the steel pipe.

[0054] When the first heating module 21 is working, it heats the steel pipe wall to a high temperature rapidly. However, the high temperature of the steel pipe wall can be transferred to the first heating module 21, causing it to overheat significantly. Therefore, in this embodiment, the first heating module 21 is provided with a water channel (not shown in the attached figure), through which cooling water circulates. This cooling water helps to remove the heat from the first heating module 21, preventing it from overheating significantly and extending its service life.

[0055] Example 2

[0056] Please refer to Figure 7 Compared with Embodiment 1, the difference in this embodiment is that the first lifting drive device 222 is a pneumatic lifting device, specifically a cylinder. The design and construction of cylinder-driven lifting are relatively simple, making its maintenance and upkeep relatively easy and low-cost. Because it uses a pneumatic method, the first heating module 21 can achieve rapid and smooth movement, thereby improving adjustment efficiency. Furthermore, the cylinder avoids problems such as motor overheating or damage, thus offering high safety and reliability.

[0057] Example 3

[0058] Please refer to Figure 8 Compared with Embodiment 1, this embodiment differs in that the dimensions of the frame 11 along the front-to-back direction are shortened, and the heating mechanism 20 is located on the front side of the processing area 13, while the spraying mechanism 30 is located on the inner side of the processing area 13. This arrangement reduces the overall weight of the crawling spraying device and prevents the crawling spraying device from falling off during the crawling process due to insufficient magnetic attraction of the magnetic component 124 to the steel pipe.

[0059] Example 4

[0060] Please refer to Figure 9 The difference between this embodiment and Embodiment 1 is that:

[0061] The crawling spraying device also includes a heating mechanism 40, with the spraying mechanism 30 located between the heating mechanism 20 and the heating mechanism 40. The heating mechanism 20, the spraying mechanism 30, and the heating mechanism 40 are arranged sequentially along the traveling direction of the crawler 10. In specific spraying operations, the heating mechanism 20 can be used to preheat the areas of the steel pipe wall that have not been powder-coated, while the heating mechanism 40 can be used to maintain the temperature of the steel pipe wall area that has been sprayed with hot melt or hot-curing powder, thereby ensuring that the hot melt or hot-curing powder is fully cured and the resulting hot melt or hot-curing powder coating can be firmly bonded to the steel pipe wall.

[0062] Furthermore, the heat replenishment mechanism 40 includes a second heating module 41 located behind the spraying mechanism 30 and with adjustable height. In this embodiment, the heat replenishment mechanism 40 includes a second heating module 41, which also uses a vortex coil and utilizes the principle of magnetic field induction eddy current heating. When current passes through the second heating module 41, a magnetic field is generated. When the magnetic force in the magnetic field passes through the steel pipe, the steel pipe is heated through the eddy current effect, thereby achieving the effect of heat preservation for the steel pipe.

[0063] It should be noted that the second heating module 41 in this embodiment uses a vortex coil, which is only one preferred implementation. In other embodiments, the second heating module 41 can be replaced by an infrared heating device, a resistance heating heat transfer device, a microwave heating device, etc., and is not limited to the magnetic effect heating of the second heating module 41 in this embodiment.

[0064] Furthermore, the heating compensation mechanism 40 also includes a second lifting drive device 42 connected to the body frame 11 and used to adjust the height of the second heating module 41. The second lifting drive device 42 can be a screw adjustment component, a pneumatic lifting device, a hydraulic lifting device or an electric lifting device. The height of the second heating module 41 can be adjusted by the second lifting drive device 42 to adapt to the heating compensation or heat preservation of steel pipes of different sizes.

[0065] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A compact crawling spraying device, characterized in that, include: The crawler (10) includes a body frame (11) and moving components (12) fixed to the left and right ends of the body frame (11), and a processing area (13) is formed in the middle of the body frame (11); The heating mechanism (20) includes a first heating module (21) located on the front or inside of the processing area (13) and with adjustable height; The spraying mechanism (30) is located behind the heating mechanism (20) in the direction of movement. It includes a guide rail (31) fixed to the body frame (11), a spray gun (32) that slides along the guide rail (31) in the left and right direction, and a translation drive device (33) for driving the spray gun (32) to reciprocate in the left and right direction. The nozzle of the spray gun (32) faces the processing area (13).

2. The compact crawling spraying device according to claim 1, characterized in that, The moving component (12) includes a traveling trolley fixed to the left and right sides of the fuselage frame (11).

3. The compact crawling spraying device according to claim 1, characterized in that, The heating mechanism (20) further includes a lifting assembly (22) for adjusting the height of the first heating module (21). The lifting assembly (22) includes a mounting base (221) fixed to the body frame (11), a first lifting drive device (222) provided on the mounting base (221), and a frame (223) connected to the output end of the first lifting drive device (222). The first heating module (21) is fixed to the frame (223).

4. The compact crawling spraying device according to claim 3, characterized in that, The first lifting drive device (222) is a screw adjuster, a pneumatic lifting device, a hydraulic lifting device or an electric lifting device.

5. The compact crawling spraying device according to claim 1, characterized in that, The crawling spraying device also includes a heating mechanism (40), and the spraying mechanism (30) is located between the heating mechanism (20) and the heating mechanism (40).

6. The compact crawling spraying device according to claim 5, characterized in that, The heating mechanism (40) includes a second heating module (41) located behind the spraying mechanism (30) and with adjustable height.

7. A compact crawling spraying device according to claim 6, characterized in that, The heating mechanism (40) further includes a second lifting drive device (42) connected to the fuselage frame (11) and used to adjust the height of the second heating module (41).

8. A compact crawling spraying device according to claim 7, characterized in that, The second lifting drive device (42) is a screw adjuster, a pneumatic lifting device, a hydraulic lifting device or an electric lifting device.

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