Steel pipe coating device and process thereof

Abstract

The invention belongs to the technical field of pipeline machining, and particularly relates to a steel pipe coating device which comprises a first translation mechanism, a spray head, a clamping mechanism and a second translation mechanism, the first translation mechanism can drive the spray head to translate in the axial direction of a steel pipe, and the clamping mechanism comprises a left fixing frame and a right moving frame. A rotating mechanism and a rotating cylinder are installed on the left fixing frame, a jacking piece is arranged on the rotating cylinder in the circumferential direction, the second translation mechanism can push the right moving frame to enable the steel pipe on the conveying mechanism to be clamped, the rotating cylinder extends into the steel pipe, and the jacking piece jacks the inner wall of the steel pipe; according to the purpose, in the spraying process, clamping and lifting are achieved at the same time, so that a steel pipe does not make contact with a conveying mechanism any more, coating is not prone to being accumulated on the conveying mechanism, and the coating quality of the steel pipe is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of pipeline processing technology, specifically to a steel pipe coating device and its process. Background Technology

[0002] Steel pipe coating is a crucial protective process used to extend the service life of steel pipes. During spraying, two spray guns are usually set up in the spraying room, one above the other, to spray the upper and lower sides respectively. However, the powder above the steel pipe will fall onto the upper surface of the steel pipe under the action of gravity, resulting in a thicker coating on the upper surface of the steel pipe.

[0003] The existing patent CN115921190A steel pipe spraying system uses a steel pipe tensioning device to rotate the steel pipe during the spraying process, so that the entire circumference of the steel pipe is sprayed evenly, avoiding uneven coating thickness caused by gravity. Furthermore, since the steel pipe can rotate during the spraying process, there is no need to set spray guns on the top and bottom sides, reducing powder dispersion and waste during the spraying process.

[0004] While the above solution can make the coating more uniform, the steel pipe is still in contact with the transmission mechanism (usually a drive roller or chain conveyor) when the steel pipe tensioning device drives the steel pipe to rotate. The coating will inevitably adhere to the transmission mechanism, affecting the quality of the steel pipe coating. Furthermore, the coating gradually accumulates on the transmission mechanism, which can lead to poor transmission and increase the motor load. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a steel pipe coating device, which ensures the quality of the steel pipe coating by preventing the steel pipe from contacting the transmission mechanism during the spraying process, thus preventing the paint from accumulating on the transmission mechanism.

[0006] The technical solution adopted in this invention is as follows: A steel pipe coating device includes a first translation mechanism, a spray head, a clamping mechanism, and a second translation mechanism. The first translation mechanism can drive the spray head to translate along the axial direction of the steel pipe. The clamping mechanism includes a left fixed frame and a right movable frame. A rotating mechanism and a rotating cylinder are installed on the left fixed frame. A clamping member is provided circumferentially on the rotating cylinder. The second translation mechanism can push the right movable frame to clamp the steel pipe on the transmission mechanism and cause the rotating cylinder to extend into the steel pipe. The clamping member presses against the inner wall of the steel pipe. When the steel pipe is on the transmission mechanism, the center of the rotating cylinder is higher than the center of the steel pipe. When the steel pipe is clamped, the center of the rotating cylinder and the center of the steel pipe are at the same height.

[0007] Working principle: The steel pipe can be axially limited by the left fixed frame and the right movable frame, and the steel pipe is tightened and fixed from the inside by the clamping part, which can lift the steel pipe and separate it from the bottom transmission mechanism. At this time, the steel pipe is sprayed with coating, so that the coating on the steel pipe is not easy to fall onto the transmission mechanism.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. With the above settings, the steel pipe no longer comes into contact with the transmission mechanism during the spraying process, and the paint is less likely to accumulate on the transmission mechanism, thus ensuring the quality of the steel pipe coating. 2. The left fixed frame and the right movable frame axially limit the steel pipe, making the steel pipe rotate more smoothly.

[0009] In a preferred embodiment of the present invention, the clamping member includes a push rod, the rotating cylinder has a plurality of sliding holes circumferentially opened, the push rod slides radially along the corresponding sliding holes, the lower end of the push rod has an inclined surface on the side facing the right moving frame, a crossbar is installed on the right moving frame, the crossbar can extend into the sliding cylinder, and the push rod is pushed to the inner wall of the steel pipe by the inclined surface.

[0010] Beneficial effects: With the above settings, when the second translation mechanism drives the right moving frame, while pushing the steel pipe to move to the left fixed frame, the crossbar will force the top rod to press against the inner wall of the steel pipe through the inclined surface, thus completing the axial limit of the steel pipe and clamping the steel pipe at the same time.

[0011] In a preferred embodiment of the present invention, a lifting mechanism and a lifting frame are also included. The lifting mechanism can drive the lifting frame to move up and down. The clamping mechanism, the first translation mechanism, and the second translation mechanism are all installed on the lifting frame.

[0012] Beneficial effects: By setting up an adjustable lifting frame, the entire steel pipe spraying device can be positioned according to the size of the steel pipe and can meet the obstacle avoidance requirements during the steel pipe transportation process.

[0013] In a preferred embodiment of the present invention, a support base is also included. The steel pipe is transported by two sets of transmission rollers, which are located on both sides of the lower part of the steel pipe in a V-shape. The support base is located between the two sets of transmission rollers and can support the left fixed frame and the right movable frame.

[0014] Beneficial effect: By setting up support bases, the upper left fixed frame and right movable frame are prevented from being suspended in the air, thus ensuring the support of the steel pipe.

[0015] In a preferred embodiment of the present invention, the lifting frame is provided with a rack, and both the first translation mechanism and the second translation mechanism include a first motor and a first gear. The first motor can slide along the lifting frame, and the first gear meshes with the rack.

[0016] Beneficial effect: By setting a rack, the first translation mechanism and the second translation mechanism share the rack, which can meet the coating needs of steel pipes of different lengths.

[0017] In a preferred embodiment of the present invention, a rotating hole is provided laterally on the left fixed frame, the rotating cylinder passes through the rotating hole and is rotatably connected to the left fixed frame, a gear ring is fixedly connected to the side of the rotating cylinder away from the right moving frame, a second motor is fixedly connected to the left fixed frame, and a second gear that meshes with the gear ring is fixedly connected to the output shaft of the second motor.

[0018] Beneficial effect: By setting a second motor and using a second gear and gear ring for transmission, the rotating drum can be driven to rotate, thereby controlling the rotation of the steel pipe.

[0019] In a preferred embodiment of the present invention, the clamping member includes a top block, and the rotating cylinder is provided with a first air passage. After gas is introduced into the first air passage, the top block can move radially outward and clamp the steel pipe.

[0020] Beneficial effect: By introducing gas through the first air passage, the pressure inside the first air passage rises, which allows the top blocks in multiple directions to press the steel pipe tightly.

[0021] In a preferred embodiment of the present invention, the left fixed frame is provided with a second air passage and a plurality of air blowing holes, all of which are located below the steel pipe, and the airflow direction of the air blowing holes is the same as the axial direction of the steel pipe.

[0022] Beneficial effects: By setting up the above structure, the axial airflow can be used to remove dust from the steel pipe before spraying. During spraying, the axial airflow can be used to blow the paint that has detached from the steel pipe forward, making it less likely for the paint to fall onto the conveying mechanisms on both sides.

[0023] This invention also provides a steel pipe coating process, using the steel pipe coating device described above, comprising the following steps: S1: The transmission mechanism transmits the steel pipe into the spraying chamber and is located between the left fixed frame and the right moving frame; S2: The lifting mechanism drives the lifting frame to descend, so that the left fixed frame and the right movable frame are supported by the support seat; S3: The second translation mechanism drives the right moving frame to press the steel pipe against the left fixed frame, and causes the pressing component to lift and press the steel pipe against the frame. S4: The rotating cylinder drives the steel pipe to rotate, and the first translation mechanism drives the nozzle to translate, so as to perform spiral spraying on the steel pipe.

[0024] Beneficial effects: Through the above process, during spiral spraying, the nozzle is always positioned above the steel pipe, making it less likely for the paint to fall onto the outside of the steel pipe, and the steel pipe is separated from the transmission mechanism, thus ensuring the quality of the steel pipe spraying.

[0025] In a preferred embodiment of the present invention, electrostatic spraying is used during spraying, and the coating on the steel pipe is cured by radiation heating.

[0026] Beneficial effects: Electrostatic spraying has a high paint coverage rate, which can effectively reduce the amount of paint falling off, and the coating can be stabilized after heating and curing for 10-20 minutes after electrostatic spraying. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the clamping structure in Embodiment 1 of the steel pipe coating device of the present invention; Figure 2 This is a schematic diagram of the structure of a steel pipe coating device according to Embodiment 1 of the present invention when it is not clamped. Figure 3 This is a cross-sectional view of the steel pipe coating device according to Embodiment 1 of the present invention during clamping; Figure 4 This is a cross-sectional view of the steel pipe coating device of the present invention during clamping in Embodiment 1; Figure 5 This is a schematic diagram of the transmission structure in Embodiment 2 of the steel pipe coating device of the present invention; Figure 6 This is a cross-sectional view of the rotating cylinder in Embodiment 2 of the steel pipe coating device of the present invention.

[0028] The reference numerals in the attached drawings include: 1. Conveyor roller; 2. Steel pipe; 3. Lifting frame; 31. Rack; 4. First translation mechanism; 41. Nozzle; 5. Second translation mechanism; 51. First motor; 52. First gear; 61. Left fixed frame; 62. Rotating cylinder; 63. Second motor; 64. Gear ring; 65. Second gear; 66. Top rod; 67. Arc block; 71. Right moving frame; 72. Crossbar; 8. Support seat; 91. Top block; 92. Main air passage; 93. First air passage; 94. Second air passage; 95. Sealing ring; 96. Annular groove; 97. Overflow valve; 98. Air blowing hole. Detailed Implementation

[0029] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0030] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Example 1 See Figure 1As shown, this embodiment discloses a steel pipe coating device. The steel pipe 2 is transported by two sets of transmission rollers 1. The two sets of transmission rollers 1 are located on both sides of the lower part of the steel pipe 2, and are transported in a V-shape. The steel pipe 2 can be transported to the spraying chamber. The steel pipe 2 coating device is set in the spraying chamber. The steel pipe 2 coating device includes a lifting mechanism, a lifting frame 3, a first translation mechanism 4, a spray head 41, a clamping mechanism, a second translation mechanism 5, and a support base.

[0032] The lifting mechanism is a hydraulic cylinder, which is located at the top of the spraying chamber and can drive the lifting frame 3 to rise and fall. The lifting frame 3 is equipped with a rack 31. The first translation mechanism 4 and the second translation mechanism 5 both include a first motor 51 and a first gear 52. The first motor 51 can slide along the lifting frame 3, and the first gear 52 meshes with the rack 31.

[0033] In other embodiments, the lifting mechanism may be a cylinder or a lead screw, and the first translation mechanism 4 and the second translation mechanism 5 may also be a hydraulic cylinder or a lead screw.

[0034] Among them, see Figures 2 to 4 As shown, the clamping mechanism includes a left fixed frame 61 and a right movable frame 71. The left fixed frame 61 is equipped with a rotating mechanism and a rotating cylinder 62. The first translation mechanism 4 can drive the nozzle 41 to translate axially along the steel pipe 2. The second translation mechanism 5 can push the right movable frame 71 to clamp the steel pipe 2 on the transmission mechanism and cause the rotating cylinder 62 to extend into the rotating cylinder 62. The clamping member presses against the inner wall of the steel pipe 2. The left fixed frame 61 is equipped with a rotating mechanism and a rotating cylinder 62. The rotating cylinder 62 is circumferentially provided with a clamping member. The clamping member includes a push rod 66. The rotating cylinder 62 is circumferentially provided with multiple sliding holes. The push rod 66 slides radially along the corresponding sliding holes. The lower end of the push rod 66 is provided with an inclined surface on the side facing the right movable frame 71. The right movable frame 71 is rotatably mounted with a crossbar 72. The crossbar 72 can extend into the sliding cylinder and push the push rod 66 against the inner wall of the steel pipe 2 through the inclined surface.

[0035] The top rod 66 is provided with an arc-shaped block 67. A compression spring (not shown in the figure) is radially connected between the inner wall of the arc-shaped block 67 and the outer wall of the rotating cylinder 62 to prevent the arc-shaped block 67 from disengaging from the sliding hole and to assist its reset.

[0036] The contact surface between the top rod 66 and the steel pipe 2 is provided with a friction layer made of rubber to increase friction and accommodate a certain degree of pipe diameter error.

[0037] The left fixed frame 61 has a horizontally opening for a rotating hole. The rotating cylinder 62 passes through the rotating hole and is rotatably connected to the left fixed frame 61. A gear ring 64 is fixedly connected to the side of the rotating cylinder 62 away from the right moving frame 71. A second motor 63 is fixedly connected to the left fixed frame 61. The output shaft of the second motor 63 is fixedly connected to a second gear 65 that meshes with the gear ring 64. By setting the second motor 63 and using the second gear 65 and the gear ring 64 for transmission, the rotating cylinder 62 can be driven to rotate, thereby controlling the rotation of the steel pipe 2.

[0038] The support base 8 is located between the two sets of transmission rollers 1 and can support the left fixed frame 61 and the right movable frame 71.

[0039] The lifting frame 3 is provided with multiple mounting holes, and the left fixing frame 61 is provided with through holes corresponding to the mounting holes. It can be fixed by screws, thereby adjusting the position of the left fixing frame 61 to accommodate steel pipes of different lengths.

[0040] This embodiment also discloses a steel pipe coating process, which uses the steel pipe coating device described above and includes the following steps: S1: The transmission mechanism transmits the steel pipe 2 to the spraying chamber and is located between the left fixed frame 61 and the right movable frame 71; S2: The lifting mechanism drives the lifting frame 3 to descend, so that the left fixed frame 61 and the right movable frame 71 are supported by the support seat; S3: The second translation mechanism 5 drives the right moving frame 71 to press the steel pipe 2 against the left fixed frame 61, and the pressing part lifts and presses the steel pipe 2 against it. S4: The rotating cylinder 62 drives the steel pipe 2 to rotate, and the first translation mechanism 4 drives the nozzle 41 to translate, so as to perform spiral spraying on the steel pipe 2.

[0041] In this embodiment, a radiant heating lamp is installed in the spraying chamber to heat the steel pipe 2. Electrostatic spraying is used during spraying, and the coating on the steel pipe 2 is cured by radiant heating.

[0042] Example 2 Please see Figure 5 and Figure 6 , Figure 6 The direction of the middle arrow is the airflow transmission direction. In the first embodiment, the steel pipe 2 coating device of this embodiment includes a top block 91 as the clamping member. The rotating cylinder 62 is provided with a first air passage 93. After the first air passage 93 is filled with gas, the top block 91 can move radially outward and clamp the steel pipe 2. The left fixed frame 61 is provided with a second air passage 94 and multiple air blowing holes 98. All of the multiple air blowing holes 98 are located below the steel pipe 2, and the airflow direction of the air blowing holes 98 is the same as the axial direction of the steel pipe 2. The multiple air blowing holes 98 are arranged in a [missing information - likely a specific orientation or pattern]. Figure 5The middle distribution extends to both sides of the lower part of steel pipe 2; The lower part of the left fixed frame 61 is provided with a main air passage 92 and an annular groove 96 coaxially arranged with the rotating cylinder 62. Two spaced sealing rings 95 are provided in the annular groove 96 to ensure airtightness. An air pump supplies air to the main air passage 92, so that the gas flows from the main air passage 92 to between the two sealing rings 95, and then enters the first air passage 93, thereby causing the top block 91 to be pushed outward, thus pressing the steel pipe 2. A spring is provided between the top block 91 and the outer wall of the rotating cylinder 62 for reset. The main air passage 92 is also connected to the second air passage 94. The second air passage 94 is provided with an overflow valve 97. When the air pressure in the first air passage 93 reaches a preset value, the air pressure passes through the overflow valve 97, thereby blowing out through the air blowing hole 98.

[0043] The working method and principle of this embodiment are as follows: The transmission mechanism transports the steel pipe 2 to the spraying chamber and positions it between the left fixed frame 61 and the right moving frame 71. The lifting mechanism drives the lifting frame 3 to descend, so that the left fixed frame 61 is supported by the support seat 8 (to avoid the paint adhering to the support seat 8 later, the support seat is shortened to support only the left fixed frame 61). The second translation mechanism 5 drives the right moving frame 71 to move the steel pipe 2 to the rotating cylinder 62. The air pump is started and the clamping part lifts and clamps the steel pipe 2. The right moving frame 71 retracts, so that both ends of the steel pipe 2 are exposed, no longer causing wear during rotation, and can be sprayed. At this time, the rotating cylinder 62 drives the steel pipe 2 to rotate one revolution, and the air blowing hole 98 at the bottom blows air continuously to clean the outer surface of the steel pipe 2. After cleaning, the spraying work is carried out. The spraying area is always on the upper part of the steel pipe 2. Once the steel pipe 2 is rotating, if the paint that is not tightly adhered is scattered, or when the end face is sprayed, it is affected by the airflow of the air blowing hole 98 and blown onto the inner wall of the right moving frame 71, so as to minimize the paint adhering to the transmission mechanism. The right moving frame 71 can be set as a metal plate, which carries the opposite static electricity to the paint particles, making it easier to capture the paint. The concentrated capture facilitates subsequent cleaning. The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A steel pipe coating device, comprising a first translation mechanism and a spray head, wherein the first translation mechanism can drive the spray head to translate along the axial direction of the steel pipe, characterized in that: It also includes a clamping mechanism and a second translation mechanism. The clamping mechanism includes a left fixed frame and a right movable frame. A rotating mechanism and a rotating cylinder are installed on the left fixed frame. A clamping member is provided circumferentially on the rotating cylinder. The second translation mechanism can push the right movable frame to clamp the steel pipe on the transmission mechanism and allow the rotating cylinder to extend into the steel pipe. The clamping member presses against the inner wall of the steel pipe. When the steel pipe is on the transmission mechanism, the center of the rotating cylinder is higher than the center of the steel pipe. When the steel pipe is clamped, the center of the rotating cylinder and the center of the steel pipe are at the same height.

2. The steel pipe coating device according to claim 1, characterized in that: The clamping component includes a push rod. The rotating cylinder has multiple sliding holes circumferentially. The push rod slides radially along the corresponding sliding holes. The lower end of the push rod has an inclined surface facing the right moving frame. A crossbar is installed on the right moving frame. The crossbar can extend into the sliding cylinder and push the push rod against the inner wall of the steel pipe through the inclined surface.

3. The steel pipe coating device according to claim 1, characterized in that: It also includes a lifting mechanism and a lifting frame. The lifting mechanism can drive the lifting frame to rise and fall. The clamping mechanism, the first translation mechanism, and the second translation mechanism are all installed on the lifting frame.

4. The steel pipe coating device according to claim 3, characterized in that: It also includes a support base. The steel pipe is transported by two sets of transmission rollers. The two sets of transmission rollers are located on both sides of the lower part of the steel pipe, and are transported in a V-shape. The support base is located between the two sets of transmission rollers and can support the left fixed frame and the right movable frame.

5. The steel pipe coating device according to claim 3, characterized in that: The lifting frame is equipped with a rack, and both the first translation mechanism and the second translation mechanism include a first motor and a first gear. The first motor can slide along the lifting frame, and the first gear meshes with the rack.

6. The steel pipe coating device according to claim 1, characterized in that: A rotating hole is provided horizontally on the left fixed frame. The rotating cylinder passes through the rotating hole and is rotatably connected to the left fixed frame. A gear ring is fixedly connected to the side of the rotating cylinder away from the right moving frame. A second motor is fixedly connected to the left fixed frame. A second gear that meshes with the gear ring is fixedly connected to the output shaft of the second motor.

7. The steel pipe coating device according to claim 1, characterized in that: The clamping component includes a top block, and the rotating cylinder is provided with a first air passage. After gas is introduced into the first air passage, the top block can move radially outward and clamp the steel pipe.

8. The steel pipe coating device according to claim 7, characterized in that: The left fixed frame is provided with a second air passage and multiple air blowing holes. The multiple air blowing holes are all located below the steel pipe, and the airflow direction of the air blowing holes is the same as the axial direction of the steel pipe.

9. A steel pipe coating process, employing the steel pipe coating apparatus according to any one of claims 1-6, characterized in that, Includes the following steps: S1: The transmission mechanism transmits the steel pipe into the spraying chamber and is located between the left fixed frame and the right movable frame; S2: The lifting mechanism drives the lifting frame to descend, so that the left fixed frame and the right movable frame are supported by the support seat; S3: The second translation mechanism drives the right moving frame to press the steel pipe against the left fixed frame, and causes the pressing component to lift and press the steel pipe against the frame. S4: The rotating cylinder drives the steel pipe to rotate, and the first translation mechanism drives the nozzle to translate, so as to perform spiral spraying on the steel pipe.

10. The steel pipe coating process according to claim 7, characterized in that: Electrostatic spraying is used during the spraying process, and the coating on the steel pipe is cured by radiation heating.

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