Steel pipe support-free inner spraying device

Abstract

The invention relates to the technical field of steel pipe machining, in particular to a support-free inner spraying device for a steel pipe. Which comprises a walking trolley, walking rollers are arranged below the walking trolley, and a walking track matched with the walking rollers for use is arranged below the walking rollers, and is characterized in that a mounting plate is arranged above the walking trolley, a conical spraying gun barrel is arranged on the mounting plate, and a spraying head is arranged at the end, away from the mounting plate, of the spraying gun barrel; the projection of the spraying head on the horizontal plane is located outside the projection of the walking vehicle on the horizontal plane, a spraying channel communicating with the spraying head is arranged in the spraying gun barrel, and the spraying channel communicates with a spraying box arranged on the walking vehicle through a spraying pipe. According to the spraying device, the spraying gun barrel is arranged on the mounting plate in a cantilever mode, when the inner wall of the pipeline is sprayed, the spraying gun barrel is conveyed into the pipeline through the trolley, the interior of the pipeline is sprayed through the spraying head, the whole device does not make contact with the interior of the pipeline, and the spraying quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe processing, and particularly relates to a steel pipe non-support internal spraying device. Background Art

[0002] By using spraying technology, coatings with wear resistance, corrosion resistance, heat insulation, electrical conductivity, insulation, sealing, lubrication, and other special mechanical physical and chemical properties can be obtained on various substrates. The application range is very wide, covering all sectors of the national economy and various fields including cutting-edge technologies. At present, the inner walls of large-diameter steel pipes are all treated with paint or powder coatings for inner wall anti-corrosion to improve the service life of the steel pipes.

[0003] Chinese Patent CN215586904U discloses a steel pipe internal spraying system, including a steel pipe positioning and supporting device, a spraying machine, and a spraying machine positioning and conveying device. The steel pipe positioning and supporting device includes a support frame and a turning table. One end of the turning table is hinged to the front end of the support frame through a rotating shaft. An elevating oil cylinder is provided at the rear end of the support frame, and the turning table is driven by the elevating oil cylinder to swing up and down around the rotating shaft. A guide rail is provided on the top of the turning table, and a pair of support sliders are provided on the guide rail. The support slider and the guide rail are locked by a screw. An adjustable steel pipe end limit block is provided on the support slider near the front end of the guide rail. The spraying machine includes a main shaft, a liquid extraction pump, a pair of spray heads, and a set of telescopic frames. The advantages of the present invention are: spraying is carried out by the spraying machine walking inside the pipe, effectively improving work efficiency and spraying quality.

[0004] Although the above patent can spray the inner wall of the steel pipe, there are still some problems in the use process: when the spraying machine moves inside the pipeline, it is necessary to use the rollers on the inner boom and the outer boom to support on the inner wall of the steel pipe. Due to the weld protrusions inside the steel pipe, when the rollers contact the welds, the spraying machine will jump, affecting the surface quality of the inner spraying of the steel pipe, reducing the qualified rate of products, and increasing production costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a steel pipe non-support internal spraying device for improving spraying quality.

[0006] The technical solution adopted by the present invention to solve its technical problems is a steel pipe non-support internal spraying device, including a walking vehicle. Walking rollers are arranged below the walking vehicle, and a walking track cooperating with the walking rollers is arranged below the walking rollers. It is characterized in that: an installation plate is arranged above the walking vehicle, a conical spraying gun rod is arranged on the installation plate along the length direction of the walking track, a spraying head is arranged at the end of the spraying gun rod far away from the installation plate, the projection of the spraying head on the horizontal plane is located outside the projection of the walking vehicle on the horizontal plane, a spraying channel communicating with the spraying head is arranged inside the spraying gun rod, and the spraying channel is communicated with a spraying box arranged on the walking vehicle through a spraying pipe.

[0007] Further, the cross-section of the spraying gun rod is a regular octagon.

[0008] Further, the material of the spraying gun rod is Q235.

[0009] Further, the spraying gun rod includes a first gun rod and a second gun rod arranged coaxially. The spraying head is arranged at the small end of the second gun rod. The lengths of the first gun rod and the second gun rod are 8m. The outer diameter of the large end of the first gun rod is 300mm, and the outer diameter of the small end is 220mm; the outer diameter of the large end of the second gun rod is 220mm, and the outer diameter of the small end is 140mm.

[0010] Further, support rings are arranged inside both the first gun rod and the second gun rod.

[0011] Further, a counterweight block is arranged on the walking vehicle.

[0012] Further, an adjusting mechanism for adjusting the height of the spraying gun rod is arranged between the installation plate and the spraying gun rod.

[0013] Further, the adjusting mechanism includes at least 3 groups of adjusting holes arranged on the installation plate. Each group of adjusting holes includes at least two first bolt holes. At least two of the first bolt holes are arranged vertically. Second bolt holes cooperating with the first bolt holes are arranged on the spraying gun rod, and the first bolt holes and the second bolt holes are connected by bolts.

[0014] Further, the adjusting mechanism includes at least 3 groups of long holes arranged vertically on the installation plate. Second bolt holes cooperating with the long holes are arranged on the spraying gun rod, and the long holes and the second bolt holes are connected by bolts.

[0015] Further, a limiting groove cooperating with the walking track is arranged on the walking rollers.

[0016] The beneficial effects of the present invention are:

[0017] 1. The spraying gun rod is arranged on the mounting plate in a cantilever manner. When spraying the inner wall of the pipeline, the spraying gun rod is transported into the pipeline by a trolley, and the inner wall of the pipeline is sprayed by the spraying head. The whole device will not come into contact with the inner part of the pipeline, improving the spraying quality.

[0018] 2. The diameter of the first end of the spraying gun rod is smaller than that of the second end, so that the first end of the spraying gun rod is not prone to sagging, and the spraying head can be maintained at the axial position of the steel pipe, greatly improving the spraying uniformity of the inner wall of the steel pipe.

[0019] 3. By setting an adjusting mechanism, the adjusting mechanism can adjust the height of the spraying gun rod, thereby adjusting the concentricity between the nozzle and the steel pipe, further improving the adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a top view of the spraying gun rod;

[0022] Figure 3 is a schematic diagram of the first gun rod;

[0023] Figure 4 is a schematic diagram of the second gun rod;

[0024] Figure 5 is a schematic diagram of the first embodiment of the adjusting mechanism;

[0025] Figure 6 is a schematic diagram of the second embodiment of the adjusting mechanism;

[0026] Figure 7 is a schematic diagram of the cooperation between the traveling roller and the traveling track.

[0027] REFERENCE SIGNS: 1 - traveling vehicle; 2 - traveling roller; 201 - limiting groove; 3 - traveling track; 4 - spraying gun rod; 401 - first gun rod; 402 - second gun rod; 403 - support ring; 404 - second bolt hole; 405 - spraying channel; 5 - mounting plate; 6 - spraying head; 7 - spraying box; 8 - spraying pipe; 9 - adjusting mechanism; 901 - adjusting hole; 902 - first bolt hole; 903 - long hole; 10 - steel pipe; 11 - counterweight. DETAILED DESCRIPTION OF THE INVENTION

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0029] As shown Figures 1 - 7 in the figure, a steel pipe non-support internal spraying device of the present invention includes a walking vehicle 1. A walking roller 2 is arranged below the walking vehicle 1, and a walking track 3 used in cooperation with the walking roller 2 is arranged below the walking roller 2. It is characterized in that: an installation plate 5 is arranged above the walking vehicle 1, a conical spraying gun rod 4 is arranged on the installation plate 5 along the length direction of the walking track 3, a spraying head 6 is arranged at the end of the spraying gun rod 4 far away from the installation plate 5, the projection of the spraying head 6 on the horizontal plane is located outside the projection of the walking vehicle 1 on the horizontal plane, a spraying channel 405 communicated with the spraying head 6 is arranged inside the spraying gun rod 4, and the spraying channel 405 is communicated with a spraying box 7 arranged on the walking vehicle 1 through a spraying pipe 8.

[0030] Among them, the walking vehicle 1 is used to install components such as the walking roller 2 and the spraying gun rod 4. The walking roller 2 is rotatably connected to the walking vehicle 1. The number of walking rollers 2 is 4, 6 or 8. A driving motor is arranged on the walking vehicle 1 to drive the walking roller 2 to rotate. A walking track 3 used in cooperation with the walking roller 2 is arranged below the walking roller 2. The walking track 3 is used to guide the walking roller 2. The walking roller 2 moves on the walking track 3, thereby driving the spraying gun rod 4 to move inside the steel pipe 10; the installation plate 5 is a steel plate and can be bolted to the walking vehicle 1. If the walking vehicle 1 is made of steel, welding can also be used for connection; a conical spraying gun rod 4 is arranged on the installation plate 5 along the length direction of the walking track 3. The connection method between the spraying gun rod 4 and the installation plate 5 can be bolted. If the spraying gun rod 4 is made of steel, welding connection can also be used to connect with the installation plate 5. The spraying gun rod 4 is set to be conical, so that the diameter of the head end of the spraying gun rod 4 is smaller than the diameter of the tail end of the spraying gun rod 4, so that the head end of the spraying gun rod 4 is not easy to sag, and the spraying head 6 can be maintained at the axis position of the steel pipe 10, which can improve the spraying uniformity of the inner wall of the steel pipe 10; the spraying head 6 is used to spray the coating material onto the inner wall of the steel pipe 10. The projection of the spraying head 6 on the horizontal plane is located outside the projection of the walking vehicle 1 on the horizontal plane. Such a setting makes the spraying gun rod 4 form a cantilever structure. When the walking vehicle 1 approaches the steel pipe 10, the spraying head 6 can enter the steel pipe 10. It should be noted here that the walking vehicle 1 forms a support for the spraying gun rod 4, and the mass of the walking vehicle 1 needs to be greater than the mass of the spraying gun rod 4 to ensure that the spraying gun rod 4 will not overturn during work; the function of the spraying channel 405 is to allow the coating material to pass through and enter the spraying head 6. Through holes are arranged on the mounting seat, the spraying pipe 8 passes through the through holes and is communicated with the spraying channel 405 through a flange, so that the coating material in the spraying box 7 can be conveyed to the spraying head 6 to spray the inner wall of the pipeline.

[0031] The cross-section of the spraying gun rod 4 can be circular or square, but since the spraying gun rod 4 needs to extend outwards as much as possible, in order to improve the bending resistance of the spraying gun rod 4, further, seeFigure 2 , the cross-section of the spraying gun rod 4 is a regular octagon.

[0032] Furthermore, the material of the spraying gun rod 4 is Q235. The spraying gun rod 4 is formed by bending Q235 steel and welded at the joint.

[0033] In the actual production process, the length of the spraying gun rod 4 is 16 m. For the convenience of manufacturing, furthermore, referring to Figure 3 and Figure 4 , the spraying gun rod 4 includes a first gun rod 401 and a second gun rod 402 arranged coaxially. The spraying head 6 is arranged at the small end of the second gun rod 402. The lengths of the first gun rod 401 and the second gun rod 402 are 8 m. The outer diameter of the large end of the first gun rod 401 is 300 mm, and the outer diameter of the small end is 220 mm; the outer diameter of the large end of the second gun rod 402 is 220 mm, and the outer diameter of the small end is 140 mm. Dividing the spraying gun rod 4 into the first gun rod 401 and the second gun rod 402 with the same length is more convenient for manufacturing; the outer diameter of the small end of the first gun rod 401 is the same as the outer diameter of the large end of the second gun rod 402, enabling better docking of the first gun rod 401 and the second gun rod 402. The small end of the second gun rod 402 is smaller than the large end of the second gun rod 402, making the weight of the head end of the spraying gun rod 4 small, so that the end of the spraying gun rod 4 far from the mounting plate 5 is not prone to sagging, enabling the spraying head 6 to be maintained at the axial position of the steel pipe 10 and improving the spraying uniformity of the inner wall of the steel pipe 10.

[0034] Due to the long lengths of the first gun rod 401 and the second gun rod 402, for the support of the first gun rod 401 and the second gun rod 402, furthermore, referring to Figure 3 and Figure 4 , support rings 403 are arranged inside both the first gun rod 401 and the second gun rod 402. The support rings 403 are regular octagonal steel rings, and when manufacturing the spraying gun rod 4, the support rings 403 are welded to the inner walls of the first gun rod 401 and the second gun rod 402.

[0035] To prevent the spraying gun rod 4 from tipping over, furthermore, referring to Figure 1 , a counterweight 11 is arranged on the walking vehicle 1. The counterweight 11 is an iron block or a steel block, placed on the upper surface of the walking vehicle 1 or inside the walking vehicle 1.

[0036] When spraying the inner wall of the steel pipe 10, there may be a situation where the diameters of the steel pipes 10 are inconsistent. To enable the spraying head 6 to be located on the axis of the steel pipe 10, furthermore, referring to Figure 1 , an adjusting mechanism 9 for adjusting the height of the spraying gun rod 4 is arranged between the mounting plate 5 and the spraying gun rod 4.

[0037] Example 1 of the adjusting mechanism 9, see Figure 3 and Figure 5 , the adjusting mechanism 9 includes at least 3 groups of adjusting holes 901 arranged on the mounting plate 5. Each group of adjusting holes 901 includes at least two first bolt holes 902. At least two of the first bolt holes 902 are arranged vertically. A second bolt hole 404 cooperating with the first bolt hole 902 is arranged on the spraying gun rod 4. The first bolt hole 902 and the second bolt hole 404 are connected by bolts. Among them, the preferred number of adjusting holes 901 is 4 groups, and the number of first bolt holes 902 in each group of adjusting holes 901 is 5. When the inner wall of the first steel pipe 10 is completely sprayed, the diameter of the second steel pipe 10 is smaller than that of the first steel pipe 10. At this time, the bolt is screwed out from the first bolt hole 902 and the second bolt hole 404, and another first bolt hole 902 and the second bolt hole 404 are connected, so as to realize the adjustment of the height of the spraying gun rod 4.

[0038] Example 2 of the adjusting mechanism 9, see Figure 3 and Figure 6 , the adjusting mechanism 9 includes at least 3 groups of long holes 903 arranged vertically on the mounting plate 5. A second bolt hole 404 cooperating with the long hole 903 is arranged on the spraying gun rod 4. The long hole 903 and the second bolt hole 404 are connected by bolts. The preferred number of long holes 903 is four groups. When the inner wall of the first steel pipe 10 is completely sprayed, the diameter of the second steel pipe 10 is smaller than that of the first steel pipe 10. At this time, the bolt is loosened from the second bolt hole 404, so that the bolt moves downward in the long hole 903, and then the bolt is tightened, so as to realize the adjustment of the height of the spraying gun rod 4.

[0039] During the process of the spraying trolley moving forward, in order to prevent the spraying gun rod 4 from swinging left and right and affecting the spraying effect, further, see Figure 7 , a limiting groove 201 cooperating with the walking track 3 is arranged on the walking roller 2.

[0040] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An inner spraying device for steel pipes without support, comprising a walking vehicle (1), walking rollers (2) are arranged below the walking vehicle (1), and a walking track (3) for cooperating with the walking rollers (2) is arranged below the walking rollers (2). Characterized in that: An installation plate (5) is arranged above the walking vehicle (1), a conical spraying gun rod (4) is arranged on the installation plate (5) along the length direction of the walking track (3), a spraying head (6) is arranged at the end of the spraying gun rod (4) far from the installation plate (5), the projection of the spraying head (6) on the horizontal plane is located outside the projection of the walking vehicle (1) on the horizontal plane, a spraying channel (405) communicating with the spraying head (6) is arranged inside the spraying gun rod (4), and the spraying channel (405) is communicated with a spraying box (7) arranged on the walking vehicle (1) through a spraying pipe (8).

2. An inner spraying device for steel pipes without support according to claim 1, Characterized in that: The cross-section of the spraying gun rod (4) is a regular octagon.

3. An inner spraying device for steel pipes without support according to claim 2, Characterized in that: The material of the spraying gun rod (4) is Q235.

4. An inner spraying device for steel pipes without support according to claim 3, Characterized in that: The spraying gun rod (4) comprises a first gun rod (401) and a second gun rod (402) arranged coaxially, the spraying head (6) is arranged at the small end of the second gun rod (402), the lengths of the first gun rod (401) and the second gun rod (402) are 8m, the outer diameter of the circumscribed circle of the large end of the first gun rod (401) is 300mm, and the outer diameter of the circumscribed circle of the small end is 220mm; the outer diameter of the circumscribed circle of the large end of the second gun rod (402) is 220mm, and the outer diameter of the circumscribed circle of the small end is 140mm.

5. An inner spraying device for steel pipes without support according to claim 4, Characterized in that: Support rings (403) are arranged inside both the first gun rod (401) and the second gun rod (402).

6. An inner spraying device for steel pipes without support according to claim 1, Characterized in that: A counterweight block (11) is arranged on the walking vehicle (1).

7. An inner spraying device for steel pipes without support according to claim 1, Characterized in that: An adjusting mechanism (9) for adjusting the height of the spraying gun rod (4) is arranged between the installation plate (5) and the spraying gun rod (4).

8. An inner spraying device for steel pipes without support according to claim 7, Characterized in that: The adjusting mechanism (9) comprises at least 3 groups of adjusting holes (901) arranged on the installation plate (5), each group of adjusting holes (901) comprises at least two first bolt holes (902), at least two of the first bolt holes (902) are arranged vertically, second bolt holes (404) for cooperating with the first bolt holes (902) are arranged on the spraying gun rod (4), and the first bolt holes (902) and the second bolt holes (404) are connected by bolts.

9. An inner spraying device for steel pipes without support according to claim 7, Characterized in that: The adjusting mechanism (9) includes at least three groups of long holes (903) vertically arranged on the mounting plate (5). A second bolt hole (404) cooperating with the long holes (903) is provided on the spraying gun rod (4). The long holes (903) and the second bolt hole (404) are connected by bolts.

10. A steel pipe non-support internal spraying device according to any one of claims 1-9, characterized in that: A limiting groove (201) cooperating with the traveling track (3) is provided on the traveling roller (2).

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