Anti-corrosion spraying device for steel pipe

Abstract

The invention discloses an anti-corrosion spraying device for a steel pipe, and relates to the technical field of steel pipe anti-corrosion spraying. The spraying efficiency is improved. The device specifically comprises walking assemblies, a sliding rod and a sleeve are fixed to one ends of the two walking assemblies through screws correspondingly, the sleeve and the sliding rod are movably connected, a driving motor and a limiting column are fixed to one side of one walking assembly, the output end of the driving motor is connected with a threaded rod through a coupler, and a movable spraying mechanism is fixed to one end of the threaded rod. And the spraying mechanism is movably connected with the other walking assembly. The whole device walks along the inner wall of the steel pipe in a wriggling mode by controlling expansion and contraction of the two sets of air bag main bodies, the spraying mechanism sprays different positions of the inner wall of the steel pipe, spraying dead angles are reduced, and meanwhile when spraying is completed and the two air bag main bodies expand at the same time, the spraying dead angles are reduced. And when the drying mechanism dries the anti-corrosion coating, heat loss is reduced, and therefore the drying rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion spraying of steel pipes, and in particular to an anti-corrosion spraying device for steel pipes. Background Art

[0002] In the prior art, steel pipes are important components for conveying fluids and exchanging heat energy, and play an important role in water conservancy projects, and in the transportation of oil and natural gas. A rust layer is easily formed on the surface of the steel pipe during placement, so a protective coating needs to be sprayed on the surface of the steel pipe. Spraying on the outer surface of the steel pipe is generally more convenient, and it is only necessary to aim the spray head at the outer wall of the steel pipe for spraying. However, for the inner wall of the steel pipe, when the length of the steel pipe is long, the spray head is not convenient to extend into the inner position of the steel pipe, which makes it inconvenient to spray the inner wall of the steel pipe. After searching, the Chinese patent application number 202020793786.8 discloses an anti-corrosion spray device for steel pipes. An adjusting rod is arranged above the base of the anti-corrosion spray device for steel pipes. The adjusting rod and the base are connected by a sliding mechanism. A nozzle is arranged on the telescopic rod of the cylinder on the mounting plate above the adjusting rod. A plurality of nozzles are evenly arranged on the side of the nozzle. The nozzle is connected to an external paint box through a liquid outlet pipe and a liquid inlet pipe. A supporting mechanism is arranged at one end of the nozzle. A conical slider is arranged inside the protective cover of the supporting mechanism. A spring is arranged between the slider and the outer surface of the nozzle. A plurality of connecting rods are arranged on the side wall of the protective cover. The connecting rod is slidably connected to the protective cover. One end of the connecting rod located outside the protective cover is rotatably connected to a support wheel.

[0003] The anti-corrosion spraying device for steel pipes in the above patent has the following shortcomings: when the length of the steel pipe is long, the cylinder cannot effectively drive the nozzle to extend into the interior of the steel pipe to spray it, resulting in only shorter steel pipes being sprayed, which limits the use of the device. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an anti-corrosion spraying device for a steel pipe.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A corrosion protection spraying device for steel pipes includes a traveling assembly, wherein a sliding rod and a sleeve are fixed to one end of two traveling assemblies by screws respectively, and the sleeve and the sliding rod are movably connected, a driving motor and a limiting column are fixed to one side of one of the traveling assemblies, and the output end of the driving motor is connected to a threaded rod via a coupling, and a movable spraying mechanism is fixed to one end of the threaded rod, and the spraying mechanism and the other traveling assembly are movably connected, and a driving member for driving the movement to the spraying mechanism is movably connected to the outer wall of the limiting column, and the driving member and the threaded rod are threadedly connected, a bracket assembly is fixed to one end of one of the traveling assemblies, and airbag assemblies are fixed to one side of the bracket assembly and one side of the other traveling assembly, and the airbag assembly uses an air guide mechanism for air guide.

[0006] Preferably: the walking assembly includes a support ring and a roller mechanism, the roller mechanism includes a spring and a T-shaped rod, the T-shaped rod is movably connected to the inner wall of the through hole opened on the surface of the support ring, and the spring is sleeved on the outer wall of the T-shaped rod, and the two ends of the spring are respectively clamped on the inner surface of the support ring and the inner wall of one side of the T-shaped rod, a U-shaped frame is welded at one end of the T-shaped rod, and a walking wheel is movably connected between the inner walls on both sides of the U-shaped frame.

[0007] Preferably: the spraying mechanism includes a guide rod, a rotating plate one and a rotating plate two, the rotating plate one is fixed to one end of the threaded rod by a pin, and the guide rod is movably connected to the inner wall of a through hole opened on the surface of the rotating plate one, and the rotating plate two is fixed to one end of the guide rod by a pin, a spring one is sleeved on the outer wall of the guide rod, and the two ends of the spring one are respectively clamped between the outer wall of one side of the rotating plate one and the inner wall of one side of the rotating plate two, the spraying mechanism also includes a spray plate and a nozzle, and the spray plate is fixed to one end of the guide rod by a screw, and a plurality of nozzles are annularly threadedly connected to the outer wall of the spray plate, and the spray plate is connected to the pipeline assembly.

[0008] Preferably: the pipeline assembly includes a feed pipe, a slide and a rotary connector, the slide is movably connected to the outer wall of the limit column, and the feed pipe is fixed to the inner wall of the through hole opened on the surface of the slide by embedding, the rotary connector is fixed to the outer wall of one side of the spray plate, and the feed pipe and the rotary connector are movably connected.

[0009] Preferably: the driving member includes a threaded sleeve and a driving plate, the driving plate is movably connected to the outer wall of the limiting column, and the threaded sleeve is welded to the bottom of the driving plate, the threaded sleeve and the threaded rod are threadedly connected, a square plate is welded on the top of the threaded sleeve, and a mounting shell is welded on the inner wall of one side of the square plate, and a rolling ball is movably connected inside the mounting shell.

[0010] Preferably: the airbag assembly includes a connecting tube, a hollow tube and a hollow column, one of the connecting tubes is fixed to the outer wall of one side of the mounting plate, and the other connecting tube is movably connected to the spray plate, the hollow tube and the connecting tube are welded and fixed, and the hollow column and rotating plate one are welded and fixed, a support ring is welded at the end of rotating plate two away from the hollow tube, and the airbag body is bonded to the circumferential outer wall of the support ring, a sealing plate is welded to the inner wall of the support ring, and the airbag body and the hollow column are connected.

[0011] On the basis of the above scheme: the air guide mechanism includes a vertical plate and an air pump, the vertical plate and the sliding rod are fixedly connected, and the air pump is fixed to the outer wall of one side of the vertical plate, the output end of the air pump is fixed with a connecting pipe through a joint, and a hose is fixed at one end of the connecting pipe, and the input end of the air pump is fixed with an air intake pipe through a joint, and solenoid valve 2 and solenoid valve 1 are respectively fixed at the ends of the hose, the two solenoid valves 1 are respectively fixedly connected to the two connecting pipes, a drying mechanism is fixed at one end of the solenoid valve 2, the drying mechanism includes a nozzle and a heating wire, the nozzle and solenoid valve 2 are fixedly connected, and the heating wire is fixed to the end of the nozzle.

[0012] Based on the above scheme, it is further preferred that: the bracket assembly includes a mounting plate and an intermediate rod, the intermediate rod and one of the support rings are welded and fixed, and the mounting plate and one end of the intermediate rod are welded and fixed.

[0013] On the basis of the above scheme, it is preferred that: the nozzle is replaced by a telescopic spray assembly, and the roller mechanism is replaced by a moving mechanism, the moving mechanism includes a sliding rod and an electric telescopic rod, the sliding rod is slidably connected to the inner wall of the through hole opened on the surface of the support ring, the electric telescopic rod is fixed to the circumferential inner wall of the support ring by a screw, one end of the sliding rod and the output end of the electric telescopic rod are fixed to a guide frame by a pin, and the inner wall of the guide frame is rotatably connected to a second walking wheel, the inner wall of the guide frame is rotatably connected to a connecting rod, and the ends of the multiple connecting rods away from the guide frame are rotatably connected to the same driving ring.

[0014] On the basis of the above scheme, it is preferred that: the telescopic spray assembly includes a bellows and a nozzle, the nozzle is bonded to the circumferential outer wall of the spray plate, and the nozzle is fixed to one end of the bellows, a guide rod is welded to the circumferential outer wall of the spray plate, and the guide rod and the nozzle are slidably connected, a spring 2 is clamped between the guide rod and the nozzle, the outer wall on one side of the drive ring is rotatably connected to a conical top plate, and a triangular plate used in conjunction with the conical top plate is welded to the side wall of the nozzle.

[0015] The beneficial effects of the present invention are: By controlling the expansion and contraction of the two groups of airbag bodies, the entire device moves along the inner wall of the steel pipe in a peristaltic manner, so that the spraying mechanism sprays different positions of the inner wall of the steel pipe, reducing the spraying blind angle. At the same time, when the spraying is completed, the two airbag bodies expand at the same time, and the drying mechanism reduces heat loss when drying the anti-corrosion coating, thereby increasing the drying rate.

[0016] The elastic force of the spring is utilized to ensure that the walking wheel 1 and the inner wall of the steel pipe are closely fitted when the walking assembly walks along the inner wall of the steel pipe with different inner diameters, thereby ensuring the stability of the walking assembly when walking along the inner wall of the steel pipe.

[0017] By arranging the rotating plate 2 to be able to move laterally under the drive of the rolling ball during the rotation process, the rotating plate 2 drives the spray disc and the nozzle to move during the movement, so that the nozzle sprays different positions in the lateral direction inside the steel pipe.

[0018] By setting up an air pump, external wind can be introduced into the hose through the air inlet pipe. When the airbag body needs to be inflated, the inflation and deflation of the airbag body can be achieved by controlling the switches of solenoid valve 1 and solenoid valve 2.

[0019] When it is necessary to dry the anti-corrosion coating after spraying, one of the two solenoid valves is closed and the other is opened, so that the air blown in by the air pump is heated by the heating wire and finally ejected through the nozzle, and the hot air is used to dry the anti-corrosion coating sprayed inside the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the side structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the overall explosion structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the main structure of the present invention.

[0024] Figure 5 It is a schematic diagram of the partial structure of the main body of the present invention.

[0025] Figure 6 It is a schematic diagram of the explosion structure of the spraying mechanism of the present invention.

[0026] Figure 7 It is a schematic diagram of the overall structure of the airbag assembly of the present invention.

[0027] Figure 8 It is a schematic diagram of the local structure of the airbag assembly of the present invention.

[0028] Fig. 9 This is a schematic diagram of the installation of the spray assembly and moving mechanism of Example 2 of the present invention.

[0029] Fig.10 It is an exploded schematic diagram of the spray assembly and moving mechanism of Example 2 of the present invention.

[0030] In the figure: slide bar 1, walking wheel 2, connecting pipe 3, hose 4, airbag body 5, support ring 6, drive motor 7, mounting plate 8, sealing plate 9, guide rod 10, vertical plate 11, air pump 12, nozzle 13, connecting pipe 14, U-shaped frame 15, support ring 16, feed pipe 17, spring 18, T-shaped rod 19, intermediate rod 20, threaded rod 21, limit column 22, slide seat 23, spray plate 24, nozzle 25, spring 26, rotary connector 27, rotating plate 28 , rotating plate 29, rolling ball 30, threaded sleeve 31, driving plate 32, mounting shell 33, square plate 34, solenoid valve 1 35, solenoid valve 2 36, heating wire 37, hollow tube 38, hollow column 39, air intake pipe 40, sleeve 41, walking wheel 2 42, sliding rod 43, guide frame 44, connecting rod 45, electric telescopic rod 46, conical top plate 47, driving ring 48, guide rod 49, bellows 50, triangular plate 51, nozzle 52, spring 2 53. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Example 1

[0033] An anti-corrosion spraying device for a steel pipe, such as Figures 1 to 8 As shown, it includes a walking component, and a slide bar 1 and a sleeve 41 are fixed to one end of the two walking components by screws, and the sleeve 41 and the slide bar 1 are slidably connected. A driving motor 7 and a limiting column 22 are fixed to one side of one of the walking components, and the output end of the driving motor 7 is connected to a threaded rod 21 through a coupling, and a mobile spraying mechanism is fixed to one end of the threaded rod 21, and the spraying mechanism and the other walking component are rotatably connected. The outer wall of the limiting column 22 is slidably connected with a driving member for driving the movement to the spraying mechanism, and the driving member and the threaded rod 21 are threadedly connected. A bracket assembly is fixed to one end of one of the walking components, and an airbag assembly is fixed to one side of the bracket assembly and one side of the other walking component, and the airbag assembly uses an air guide mechanism for air guide.

[0034] When it is necessary to spray the inside of the steel pipe, the steel pipe is placed on the ground, the entire spraying device is placed inside the steel pipe, and the driving motor 7 is used to drive the threaded rod 21 to rotate. The threaded rod 21 drives the spraying mechanism to rotate during the rotation process, and the spraying mechanism is used to perform rotational spraying on the circumferential inner wall of the steel pipe to reduce the dead angle of spraying. Before spraying, the air guide mechanism is used to guide air to the airbag assembly located in front of the device. At this time, the airbag assembly in the front is expanded and fits against the inner wall of the steel pipe. The friction between the airbag assembly and the inner wall of the steel pipe is used to ensure the stability of the spraying mechanism during spraying. At this time, the airbag assembly located at the rear remains in a contracted state. When the threaded rod 21 rotates under the drive of the driving motor 7, the driving member slides along the outer wall of the threaded rod 21 under the guidance of the limiting column 22. During the movement, the driving member drives the spraying mechanism to move along the direction of the threaded rod 21, so that the spraying mechanism sprays the steel pipe in the horizontal direction during the movement. During the movement, the spraying mechanism drives the rear walking component to move along the inner wall of the steel pipe. Since the front walking component is limited by the inflated airbag component, the rear walking component moves forward a certain distance. In this process, the sliding rod 1 and the sleeve 41 are used to guide the two walking components.

[0035] When the driving member drives the spraying mechanism to move from the rear end of the threaded rod 21 to the front end of the threaded rod 21, the air guide mechanism is used to guide the air to the airbag assembly at the rear. At this time, the two airbag assemblies seal the sprayed area inside the steel pipe. At this time, the air guide mechanism is used to blow air toward the sprayed area, and the wind force is used to accelerate the drying rate of the paint in the sprayed area. Since the sprayed area is sealed by the airbag assembly, when the introduced gas is heated, the hot air is more concentrated to dry the sprayed area, effectively avoiding heat loss and increasing the drying rate of the sprayed area.

[0036] After drying is completed, the airbag assembly at the front is deflated. At this time, the driving motor 7 drives the threaded rod 21 to rotate in reverse, and the spraying mechanism is reset relative to the threaded rod 21, so that the front walking assembly moves forward a certain distance along the inside of the steel pipe. The entire device moves along the steel pipe in a manner similar to peristalsis, which is convenient for the subsequent spraying mechanism to spray new areas until all areas inside the steel pipe are sprayed.

[0037] Furthermore, the walking assembly includes a support ring 16 and a roller mechanism, the roller mechanism includes a spring 18 and a T-bar 19, the T-bar 19 is slidably connected to the inner wall of the through hole opened on the surface of the support ring 16, and the spring 18 is sleeved on the outer wall of the T-bar 19, and the two ends of the spring 18 are respectively clamped on the inner surface of the support ring 16 and the inner wall of one side of the T-bar 19, a U-shaped frame 15 is welded at one end of the T-bar 19, and a walking wheel 2 is rotatably connected between the inner walls on both sides of the U-shaped frame 15.

[0038] When the walking assembly needs to move on the inner wall of the guide rod 10, the elastic force of the spring 18 is used to make the walking assembly move along the inner wall of the steel pipe with different inner diameters. The walking wheel 2 and the inner wall of the steel pipe are tightly fitted to ensure the stability of the walking assembly when moving along the inner wall of the steel pipe.

[0039] Furthermore, the spraying mechanism includes a guide rod 10, a rotating plate 28 and a rotating plate 29, the rotating plate 28 is fixed to one end of the threaded rod 21 by a pin, and the guide rod 10 is slidably connected to the inner wall of the through hole opened on the surface of the rotating plate 28, and the rotating plate 29 is fixed to one end of the guide rod 10 by a pin, the outer wall of the guide rod 10 is sleeved with a spring 26, and the two ends of the spring 26 are respectively clamped between the outer wall of one side of the rotating plate 28 and the inner wall of one side of the rotating plate 29, the spraying mechanism also includes a spray plate 24 and a nozzle 25, and the spray plate 24 is fixed to one end of the guide rod 10 by screws, and a plurality of nozzles 25 are annularly threadedly connected to the outer wall of the spray plate 24, and the spray plate 24 is connected to the pipeline assembly.

[0040] When the driving motor 7 drives the threaded rod 21 to rotate, the spray disc 24 drives the nozzle 25 to rotate. During the rotation of the nozzle 25, the anti-corrosion paint can be evenly sprayed on the inner wall of the steel pipe. The anti-corrosion paint can be injected into the spray disc 24 by providing a pipeline assembly.

[0041] Furthermore, the pipeline assembly includes a feed pipe 17, a slide 23 and a rotary connector 27, the slide 23 is slidably connected to the outer wall of the limit column 22, and the feed pipe 17 is fixed to the inner wall of the through hole opened on the surface of the slide 23 by embedding, the rotary connector 27 is fixed to the outer wall of one side of the spray plate 24, and the feed pipe 17 and the rotary connector 27 are rotatably connected.

[0042] By providing the feeding pipe 17 , the anti-corrosion paint is introduced into the spray plate 24 through the rotary connector 27 , and finally guided out through the spray head 25 to spray the inner wall of the steel pipe.

[0043] Furthermore, the driving member includes a threaded sleeve 31 and a driving plate 32, the driving plate 32 is slidably connected to the outer wall of the limiting column 22, and the threaded sleeve 31 is welded to the bottom of the driving plate 32, the threaded sleeve 31 and the threaded rod 21 are threadedly connected, a square plate 34 is welded to the top of the threaded sleeve 31, and a mounting shell 33 is welded to the inner wall of one side of the square plate 34, and a ball 30 is rotatably connected inside the mounting shell 33.

[0044] By threading the threaded sleeve 31 and the threaded rod 21 together, when the driving motor 7 drives the threaded rod 21 to rotate, the driving plate 32 and the threaded sleeve 31 move laterally under the guidance of the limiting column 22. During the movement of the threaded sleeve 31, the ball 30 pushes the rotating plate 29. During the rotation, the rotating plate 29 can also move laterally under the drive of the ball 30. During the movement, the rotating plate 29 drives the spray disc 24 and the nozzle 25 to move, so that the nozzle 25 sprays different positions of the inside of the steel pipe in the horizontal direction.

[0045] Furthermore, the bracket assembly includes a mounting plate 8 and an intermediate rod 20 , the intermediate rod 20 and one of the support rings 16 are welded and fixed, and the mounting plate 8 and one end of the intermediate rod 20 are welded and fixed.

[0046] The airbag assembly can be installed and fixed by providing the mounting plate 8 .

[0047] Furthermore, the airbag assembly includes a connecting tube 14, a hollow tube 38 and a hollow column 39, wherein one of the connecting tubes 14 is fixed to the outer wall of one side of the mounting plate 8, and the other connecting tube 14 is rotatably connected to the spray plate 24, the hollow tube 38 and the connecting tube 14 are welded and fixed, and the hollow column 39 and the rotating plate 1 28 are welded and fixed, a support ring 6 is welded at one end of the rotating plate 29 away from the hollow tube 38, and the airbag body 5 is bonded to the circumferential outer wall of the support ring 6, a sealing plate 9 is welded to the inner wall of the support ring 6, and the airbag body 5 and the hollow column 39 are connected.

[0048] When the gas guide mechanism introduces gas into the connecting pipe 14 , the gas is introduced into the airbag body 5 through the hollow tube 38 and the hollow column 39 , so that the airbag body 5 expands after the gas is introduced.

[0049] Furthermore, the air guide mechanism includes a vertical plate 11 and an air pump 12, the vertical plate 11 and the sliding rod 1 are fixedly connected, and the air pump 12 is fixed to the outer wall of one side of the vertical plate 11 by bolts, the output end of the air pump 12 is fixed with a connecting pipe 3 through a joint, and a hose 4 is fixed at one end of the connecting pipe 3, and the input end of the air pump 12 is fixed with an air intake pipe 40 through a joint, and the ends of the hose 4 are respectively fixed with solenoid valve 2 36 and solenoid valve 1 35, the two solenoid valves 1 35 are respectively fixedly connected to the two connecting pipes 14, and a drying mechanism is fixed at one end of the solenoid valve 2 36.

[0050] By setting up the air pump 12, external wind can be introduced into the hose 4 through the air inlet pipe 40. When the airbag body 5 needs to be inflated, the inflation and deflation of the airbag body 5 can be achieved by controlling the switching of the solenoid valve 1 35 and the solenoid valve 2 36.

[0051] Furthermore, the drying mechanism includes an air jet head 13 and a heating wire 37 . The air jet head 13 and the second solenoid valve 36 are fixedly connected, and the heating wire 37 is fixed to the end of the air jet head 13 .

[0052] When it is necessary to dry the anti-corrosion coating after spraying, the two solenoid valves 1 35 are closed and the solenoid valve 2 36 is opened. The air blown in by the air pump 12 is heated by the heating wire 37 and finally ejected through the nozzle 13, and the hot air is used to dry the anti-corrosion coating inside the steel pipe.

[0053] When the present embodiment is in use, when it is necessary to spray the inner wall of the steel pipe, the entire spraying device is placed inside the steel pipe and the driving motor 7 is used to drive the threaded rod 21 to rotate. The threaded rod 21 drives the spraying mechanism to rotate during the rotation process, and the spraying mechanism is used to perform rotational spraying on the circumferential inner wall of the steel pipe. Before spraying, the air guide mechanism is used to guide air to the airbag assembly located in the front of the device. At this time, the airbag assembly in the front is expanded and fits against the inner wall of the steel pipe. The friction between the airbag assembly and the inner wall of the steel pipe is used to ensure the stability of the spraying mechanism during spraying. The airbag assembly at the rear remains in a contracted state. While the threaded rod 21 rotates under the drive of the driving motor 7, the driving member is in a Under the guidance of the limiting column 22, it slides along the outer wall of the threaded rod 21, and the driving part drives the spraying mechanism to move horizontally during the movement, so that the spraying mechanism sprays the steel pipe horizontally during the movement; when the driving part drives the spraying mechanism to move from the rear end of the threaded rod 21 to the front end of the threaded rod 21, the air guide mechanism is used to guide the air of the airbag assembly at the rear, and the two airbag assemblies seal the sprayed area inside the steel pipe. At this time, the drying mechanism is used to dry the anti-corrosion paint sprayed inside the steel pipe. Since the spraying area is sealed by the airbag assembly, when the introduced gas is heated by the heating wire 37, the hot air dries the spraying area more concentratedly. Example 2

[0054] An anti-corrosion spraying device for a steel pipe, such as Figures 9 and 10 As shown, this embodiment makes the following improvements on the basis of Embodiment 1: the nozzle 25 is replaced by a telescopic spraying assembly, and the roller mechanism is replaced by a moving mechanism, wherein the moving mechanism includes a sliding rod 43 and an electric telescopic rod 46, wherein the sliding rod 43 is slidably connected to the inner wall of the through hole opened on the surface of the support ring 16, and the electric telescopic rod 46 is fixed to the circumferential inner wall of the support ring 16 by screws, and one end of the sliding rod 43 and the output end of the electric telescopic rod 46 are fixed to a guide frame 44 by pins, and the inner wall of the guide frame 44 is rotatably connected to a walking wheel 2 42, and the inner wall of the guide frame 44 is rotatably connected to a connecting rod 45, and the ends of multiple connecting rods 45 away from the guide frame 44 are rotatably connected to the same driving ring 48.

[0055] By utilizing the connection between the connecting rod 45 and the driving ring 48, when the electric telescopic rod 46 drives the guide frame 44 to move, the other guide frames 44 can keep moving synchronously, thereby making the multiple walking wheels 42 keep close contact with the inner wall of the steel pipe according to the different inner diameters of the steel pipe.

[0056] The telescopic spray assembly includes a bellows 50 and a nozzle 52, the nozzle 52 is bonded to the circumferential outer wall of the spray plate 24, and the nozzle 52 is fixed to one end of the bellows 50, a guide rod 49 is welded to the circumferential outer wall of the spray plate 24, and the guide rod 49 and the nozzle 52 are slidably connected, a spring 2 53 is clamped between the guide rod 49 and the nozzle 52, the outer wall of one side of the drive ring 48 is rotatably connected to the conical top plate 47, and the side wall of the nozzle 52 is welded to a triangular plate 51 used in conjunction with the conical top plate 47.

[0057] When the inner diameter of the steel pipe is different, when the walking wheel 242 fits against the inner wall of the steel pipe, the position of the conical top plate 47 relative to the triangular plate 51 will change, that is, when the steel pipe is thicker, the straight-line distance between the conical top plate 47 and the support ring 16 is shorter, and the inclination angle of the connecting rod 45 is larger. The degree of extrusion of the conical top plate 47 on the inclined surface of the triangular plate 51 is greater. After the triangular plate 51 is squeezed, the distance between the end of the nozzle 52 and the spray plate 24 is larger, thereby ensuring that the nozzle 52 is closer to the circumferential inner wall of the steel pipe, avoiding the nozzle 52 being too far away from the circumferential inner wall of the steel pipe, resulting in the inability to spray the anti-corrosion paint onto the inner wall of the steel pipe, thereby ensuring the spraying effect. By rotatably connecting the conical top plate 47 and the drive ring 48, the conical top plate 47 and the triangular plate 51 rotate synchronously when the nozzle 52 rotates. The fit between the triangular plate 51 and the conical top plate 47 can be ensured by providing a guide rod 49 and a spring 253.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-corrosion spraying device for a steel pipe, comprising a traveling assembly, characterized in that: A slide bar (1) and a sleeve (41) are fixed to one end of the two walking assemblies by screws, respectively, and the sleeve (41) and the slide bar (1) are movably connected. A drive motor (7) and a limit column (22) are fixed to one side of one of the walking assemblies, and the output end of the drive motor (7) is connected to a threaded rod (21) via a coupling, and a movable spraying mechanism is fixed to one end of the threaded rod (21), and the spraying mechanism and the other walking assembly are movably connected. A driving member for driving the movement to the spraying mechanism is movably connected to the outer wall of the limit column (22), and the driving member and the threaded rod (21) are threadedly connected. A bracket assembly is fixed to one end of one of the walking assemblies, and an air bag assembly is fixed to one side of the bracket assembly and one side of the other walking assembly, and the air bag assembly uses an air guide mechanism to guide air.

2. The anti-corrosion spraying device for a steel pipe according to claim 1, characterized in that: The walking assembly comprises a support ring (16) and a roller mechanism, the roller mechanism comprises a spring (18) and a T-shaped rod (19), the T-shaped rod (19) is movably connected to the inner wall of a through hole opened on the surface of the support ring (16), the spring (18) is sleeved on the outer wall of the T-shaped rod (19), and the two ends of the spring (18) are respectively clamped on the inner surface of the support ring (16) and the inner wall of one side of the T-shaped rod (19), one end of the T-shaped rod (19) is welded with a U-shaped frame (15), and a walking wheel (2) is movably connected between the inner walls on both sides of the U-shaped frame (15).

3. The anti-corrosion spraying device for a steel pipe according to claim 2, characterized in that: The spraying mechanism comprises a guide rod (10), a rotating plate 1 (28) and a rotating plate 2 (29), wherein the rotating plate 1 (28) is fixed to one end of the threaded rod (21) by a pin, and the guide rod (10) is movably connected to the inner wall of a through hole opened on the surface of the rotating plate 1 (28), and the rotating plate 2 (29) is fixed to one end of the guide rod (10) by a pin, a spring 1 (26) is sleeved on the outer wall of the guide rod (10), and two ends of the spring 1 (26) are respectively clamped between the outer wall of one side of the rotating plate 1 (28) and the inner wall of one side of the rotating plate 2 (29), and the spraying mechanism also comprises a spray plate (24) and a spray head (25), and the spray plate (24) is fixed to one end of the guide rod (10) by a screw, and a plurality of spray heads (25) are connected to the outer wall of the spray plate (24) in the form of an annular thread, and the spray plate (24) is connected to the pipeline assembly.

4. The anti-corrosion spraying device for a steel pipe according to claim 3, characterized in that: The pipeline assembly comprises a feed pipe (17), a slide seat (23) and a rotary connector (27); the slide seat (23) is movably connected to the outer wall of the limit column (22); the feed pipe (17) is fixed to the inner wall of a through hole opened on the surface of the slide seat (23) by embedding; the rotary connector (27) is fixed to the outer wall of one side of the spray plate (24); and the feed pipe (17) and the rotary connector (27) are movably connected.

5. The anti-corrosion spraying device for steel pipe according to claim 4, characterized in that: The driving member comprises a threaded sleeve (31) and a driving plate (32), wherein the driving plate (32) is movably connected to the outer wall of the limiting column (22), and the threaded sleeve (31) is welded to the bottom of the driving plate (32), the threaded sleeve (31) and the threaded rod (21) are threadedly connected, a square plate (34) is welded to the top of the threaded sleeve (31), and a mounting shell (33) is welded to the inner wall of one side of the square plate (34), and a rolling ball (30) is movably connected inside the mounting shell (33).

6. The anti-corrosion spraying device for a steel pipe according to claim 5, characterized in that: The airbag assembly comprises a connecting tube (14), a hollow tube (38) and a hollow column (39), wherein one connecting tube (14) is fixed to an outer wall of one side of a mounting plate (8), and the other connecting tube (14) is movably connected to a spray plate (24), the hollow tube (38) and the connecting tube (14) are welded and fixed, and the hollow column (39) and the first rotating plate (28) are welded and fixed, a support ring (6) is welded to an end of the second rotating plate (29) away from the hollow tube (38), and an airbag body (5) is bonded to the circumferential outer wall of the support ring (6), a sealing plate (9) is welded to the inner wall of the support ring (6), and the airbag body (5) and the hollow column (39) are connected.

7. The anti-corrosion spraying device for a steel pipe according to claim 6, characterized in that: The air guide mechanism comprises a vertical plate (11) and an air pump (12), wherein the vertical plate (11) and the sliding rod (1) are fixedly connected, and the air pump (12) is fixed to an outer wall of one side of the vertical plate (11), the output end of the air pump (12) is fixed with a connecting pipe (3) through a joint, and a hose (4) is fixed to one end of the connecting pipe (3), and the input end of the air pump (12) is fixed with an air intake pipe (40) through a joint, and the ends of the hose (4) are respectively fixed with a second solenoid valve (36) and a first solenoid valve (35), the two first solenoid valves (35) are respectively fixedly connected to the two connecting pipes (14), and a drying mechanism is fixed to one end of the second solenoid valve (36), wherein the drying mechanism comprises a nozzle (13) and a heating wire (37), the nozzle (13) and the second solenoid valve (36) are fixedly connected, and the heating wire (37) is fixed to the end of the nozzle (13).

8. The anti-corrosion spraying device for steel pipe according to claim 7, characterized in that: The bracket assembly comprises a mounting plate (8) and an intermediate rod (20); the intermediate rod (20) and one of the support rings (16) are fixed by welding, and the mounting plate (8) and one end of the intermediate rod (20) are fixed by welding.

9. The anti-corrosion spraying device for a steel pipe according to claim 8, characterized in that: The spray head (25) is replaced with a telescopic spray assembly, and the roller mechanism is replaced with a moving mechanism, wherein the moving mechanism comprises a sliding rod (43) and an electric telescopic rod (46), wherein the sliding rod (43) is slidably connected to the inner wall of a through hole opened on the surface of the support ring (16), and the electric telescopic rod (46) is fixed to the circumferential inner wall of the support ring (16) by means of screws, and one end of the sliding rod (43) and the output end of the electric telescopic rod (46) are both fixed to a guide frame (44) by means of pins, and the inner wall of the guide frame (44) is rotatably connected to a second walking wheel (42), and the inner wall of the guide frame (44) is rotatably connected to a connecting rod (45), and the ends of the plurality of connecting rods (45) away from the guide frame (44) are rotatably connected to the same driving ring (48).

10. The anti-corrosion spraying device for steel pipe according to claim 9, characterized in that: The telescopic spray assembly comprises a bellows (50) and a nozzle (52), wherein the nozzle (52) is bonded to the circumferential outer wall of the spray plate (24), and the nozzle (52) is fixed to one end of the bellows (50), a guide rod (49) is welded to the circumferential outer wall of the spray plate (24), and the guide rod (49) and the nozzle (52) are slidably connected, a second spring (53) is clamped between the guide rod (49) and the nozzle (52), a conical top plate (47) is rotatably connected to the outer wall of one side of the drive ring (48), and a triangular plate (51) used in conjunction with the conical top plate (47) is welded to the side wall of the nozzle (52).

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