A centrifugal pipe inner wall spraying device

Abstract

The present invention is applicable to the technical field of spraying equipment, and provides a centrifugal pipe inner wall spraying device, comprising: a control tube extending to the inside of the pipe to be sprayed, a limit assembly and a spray assembly being provided at the end of the control tube; the limit assembly comprising a fixed block fixedly mounted on the control tube and a sliding block slidably connected to the control tube, a plurality of support groups being provided between the sliding block and the fixed block, and an end of each support group away from the control tube abuts against the inner wall of the pipe to be sprayed; the spray assembly comprising a rotating sleeve rotatably connected to the end of the control tube, at least one nozzle rotatably connected to the rotating sleeve, and a connecting rod for controlling the inclination angle of the nozzle, thereby, the present invention provides a device that can automatically adjust the angle of the nozzle, so that when the spraying device moves to the transition part of the variable diameter, the nozzle can be automatically directed to the inner wall bevel structure, thereby ensuring that the transition part can be evenly sprayed, thereby optimizing the spraying effect of the inner wall of the pipe.

Description

Technical Field

[0001] The invention relates to the technical field of spraying equipment, and in particular to a centrifugal pipeline inner wall spraying device. Background Art

[0002] In modern industry, after the processing of pipe fittings is completed, the inner and outer walls need to be sprayed. For example, some pipe fittings used to transport corrosive materials need to be sprayed with corrosion-resistant coatings on their inner walls.

[0003] In the prior art, there is a Chinese invention patent with a patent publication number of CN112642622A, which discloses a spin-coating pipe inner wall spraying device, including an outer support tube, a mounting seat coaxially arranged inside the outer support tube, the mounting seat can slide axially inside the outer support tube, the upper cavity inside the mounting seat is connected to the solenoid valve at the top of the outer support tube, the upper end of the spray tube is rotatably mounted in the circular groove in the mounting seat, the lower end of the spray tube extends to the bottom of the mounting seat, and a spray port is arranged around the lower end of the spray tube, a driven gear is fixed to the spray tube body, and a driving gear is rotatably installed at the bottom of the mounting seat to mesh with the driven gear, and the driving gear is driven by the motor on the mounting seat to rotate, and the device can enter the interior of the pipe fitting to spray the inner wall of the pipe fitting, but the spray head of the device is a fixed angle spray head, because some pipe fittings will have a certain variable diameter part, when spraying the variable diameter transition part, the angle of the spray head cannot be adjusted, resulting in uneven spraying of the variable diameter part by the spray head, affecting the uniformity of spraying the inner wall of the pipe fitting.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] In view of the above-mentioned defects, the purpose of the present invention is to provide a centrifugal pipe inner wall spraying device, which can be equipped with a device that can automatically adjust the angle of the nozzle. When the spraying device moves to the transition part of the variable diameter, the nozzle can be automatically facing the inner wall bevel structure to ensure that the transition part can be evenly sprayed, thereby optimizing the spraying effect of the inner wall of the pipe.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a centrifugal pipeline inner wall spraying device, comprising: a control tube extending to the inside of the pipeline to be sprayed, the end of the control tube is provided with a limit assembly for controlling the position of the control tube and a spray assembly rotatably connected to the end of the control tube; the limit assembly comprises a fixed block fixed to the control tube and a sliding block slidably connected to the control tube, a plurality of support groups are arranged between the sliding block and the fixed block, and one end of each support group away from the control tube abuts against the inner wall of the pipeline to be sprayed; the spray assembly comprises a rotating sleeve rotatably connected to the end of the control tube, at least one nozzle rotatably connected to the rotating sleeve and a connecting rod for controlling the inclination angle of the nozzle, and when the support group moves to the bevel structure inside the pipeline to be sprayed, the connecting rod controls the nozzle to rotate in the direction facing the bevel structure.

[0007] According to the centrifugal pipe inner wall spraying device of the present invention, each of the support groups includes: a first support rod rotatably connected to the fixed block; a second support rod rotatably connected to the sliding block, the second support rod is rotatably connected to the first support rod, a limiting flange is provided on the outside of the control tube, and a thrust spring is provided between the sliding block and the limiting flange to move the sliding block toward the fixed block, and the first support rod and the second support rod are abutted against the inner wall of the pipe to be sprayed under the action of the thrust spring.

[0008] According to the centrifugal pipe inner wall spraying device of the present invention, the first support rod and the second support rod are slidably connected to a roller sleeve at one end away from the control tube, a return spring is provided inside the roller sleeve to push the roller sleeve outward, a pressure sensor is provided between the return spring and the first support rod and the second support rod, and an angle sensor is provided at the hinge point of the first support rod and the second support rod.

[0009] According to the centrifugal pipe inner wall spraying device of the present invention, a sliding space is provided inside the fixed block, and the sliding space is slidably connected to a control sleeve extending from the inside of the sliding space to one end of the fixed block adjacent to the spraying component, and the sliding of the control sleeve drives the connecting rod to move.

[0010] According to the centrifugal pipe inner wall spraying device of the present invention, flanges are provided at both ends of the control sleeve, the flanges located inside the sliding space are close to the inner wall of the sliding space, the outer sleeve of the control sleeve is provided with a compression spring, the interior of the sliding space is filled with hydraulic fluid, and the position of the control sleeve inside the sliding space is controlled by controlling the flow of the hydraulic fluid, and a hydraulic control pipeline is provided outside the sliding space.

[0011] According to the centrifugal pipe inner wall spraying device of the present invention, one end of the connecting rod is rotatably connected to the end of the control sleeve located outside the sliding space through a ring sleeve, and a rotating bearing is provided between the ring sleeve and the control sleeve. The movement of the control sleeve drives the rotating bearing and the ring sleeve to move synchronously.

[0012] According to the centrifugal pipe inner wall spraying device of the present invention, the outer wall of the rotating sleeve is provided with a hinged seat, the spray head is rotatably connected to the hinged seat, a spraying channel is opened inside the spray head, the spraying channel is provided with an inlet pipe, and a supply pipe is provided at the end of the rotating sleeve, and the supply pipe is connected to the inlet pipe through a hose.

[0013] According to the centrifugal pipeline inner wall spraying device of the present invention, a connecting sleeve rotatably connected to the control pipe is provided inside the rotating sleeve, a driven gear is provided outside the connecting sleeve, a driving motor for driving the connecting sleeve to rotate is provided inside the control pipe, a driving gear meshing with the driven gear is provided on the output shaft of the driving motor, a main pipe is provided inside the control pipe, and the connecting sleeve is rotatably connected to the main pipe.

[0014] The present invention provides a centrifugal pipeline inner wall spraying device, comprising: a control tube extending into the interior of the pipeline to be sprayed, through which a spraying assembly and a limiting assembly are deeply inserted into the interior of the pipeline to be sprayed, so as to ensure that the interior of the pipeline to be sprayed can be sprayed, the end of the control tube is provided with a limiting assembly for controlling the position of the control tube and a spraying assembly rotatably connected to the end of the control tube, so as to ensure that the axis of the control tube can be controlled to a position coincident with the axis of the pipeline to be sprayed, further ensuring that the spraying assembly can evenly spray the interior of the pipeline; the limiting assembly comprises a fixed block fixedly arranged on the control tube and a sliding block slidably connected to the control tube, a plurality of support groups are arranged between the sliding block and the fixed block, each of the support groups abuts against the inner wall of the pipeline to be sprayed at one end away from the control tube, and by adjusting the distance between the sliding block and the fixed block, the support group can support the inner walls of pipelines of different diameters, so that pipelines of different diameters can be sprayed. Spraying; the spraying assembly includes a rotating sleeve rotatably connected to the end of the control tube, at least one nozzle rotatably connected to the rotating sleeve and a connecting rod for controlling the inclination angle of the nozzle. When the support group moves to the bevel structure inside the pipe to be sprayed, the connecting rod controls the nozzle to rotate in the direction facing the bevel structure, thereby ensuring that the nozzle performs uniform rotational centrifugal spraying on the inner wall of the bevel structure to prevent the bevel structure from being sprayed unevenly. At the same time, the inclination angle of the bevel structure is detected by the support group, thereby facilitating the control of the inclination angle of the nozzle to prevent the angle of the nozzle from not corresponding to the inclination angle of the bevel structure, and failing to spray the bevel structure uniformly. In summary, the technical effect produced by the present invention is that by setting a device that can automatically adjust the angle of the nozzle, when the spraying device moves to the transition part of the variable diameter, the nozzle can be automatically facing the inner wall bevel structure, ensuring that the transition part can be evenly sprayed, and optimizing the spraying effect of the inner wall of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the bevel structure part of the present invention in a spraying state;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the internal spraying state of the straight tube of the present invention;

[0018] Figure 4 yes Figure 3 The enlarged structural diagram of part A in the middle;

[0019] Figure 5 It is a schematic diagram of the cross-sectional structure of the control tube of the present invention;

[0020] Figure 6It is a schematic diagram of the three-dimensional structure of the control sleeve of the present invention;

[0021] Figure 7 It is a schematic diagram of the three-dimensional structure of the rotating sleeve of the present invention;

[0022] Figure 8 It is a schematic diagram of the three-dimensional structure of the ring sleeve of the present invention;

[0023] In the figure, 1-control tube, 2-limiting flange, 3-thrust spring, 4-sliding block, 5-roller sleeve, 51-reset spring, 52-roller, 53-sliding sleeve, 6-first support rod, 61-angle sensor, 7-fixed block, 8-control sleeve, 81-flange, 82-mounting groove, 9-rotating sleeve, 91-driven gear, 92-supply pipe, 93-articulated seat, 10-sprinkler, 11-inlet pipe, 12-connecting rod, 13-hydraulic control pipeline, 14-sliding space, 15-compression spring, 17-bevel structure, 18-hydraulic fluid, 19-main pipeline, 20-ring sleeve, 201-ring sleeve body. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] See also Figure 1~Figure 4The present invention provides a centrifugal pipeline inner wall spraying device, which includes a control tube 1 extending into the interior of the pipeline to be sprayed, through which the spraying assembly and the limiting assembly are deeply inserted into the interior of the pipeline to be sprayed, so as to ensure that the interior of the pipeline to be sprayed can be sprayed, and the end of the control tube 1 is provided with a limiting assembly for controlling the position of the control tube 1 and a spraying assembly rotatably connected to the end of the control tube 1, so as to ensure that the axis of the control tube 1 can be controlled to a position that coincides with the axis of the pipeline to be sprayed, further ensuring that the spraying assembly can evenly spray the interior of the pipeline; the limiting assembly includes a fixed block 7 fixedly arranged on the control tube 1 and a sliding block 4 slidably connected to the control tube 1, and a plurality of support groups are arranged between the sliding block 4 and the fixed block 7, and the end of each support group away from the control tube 1 abuts against the inner wall of the pipeline to be sprayed, and by adjusting the sliding block 4 and the distance between the fixed block 7, so that the support group can support the inner wall of the pipe with different diameters, so that the pipe with different diameters can be sprayed; the spraying assembly includes a rotating sleeve 9 rotatably connected to the end of the control pipe 1, at least one nozzle 10 rotatably connected to the rotating sleeve 9 and a connecting rod 12 for controlling the inclination angle of the nozzle 10. When the support group moves to the bevel structure 17 inside the pipe to be sprayed, the connecting rod 12 controls the nozzle 10 to rotate in the direction facing the bevel structure, so as to ensure that the nozzle 10 sprays the inner wall of the bevel structure 17 evenly, and prevents the bevel structure 17 from being partially sprayed unevenly. At the same time, the inclination angle of the bevel structure 17 is detected by the support group, so as to facilitate the control of the inclination angle of the nozzle 10, and prevent the angle of the nozzle 10 from not corresponding to the inclination angle of the bevel structure 17, so that the bevel structure 17 cannot be sprayed evenly.

[0026] Preferably, each of the support groups of the present invention comprises: a first support rod 6 rotatably connected to the fixed block 7 and a second support rod rotatably connected to the sliding block 4, the second support rod being rotatably connected to the first support rod 6 to ensure that the first support rod 6 and the second support rod form a scissors structure, when the diameters of the pipes to be sprayed are different, the first support rod 6 and the second support rod can adjust the angle between the support rods to ensure that the inner walls of pipes with different diameters can be supported, a limiting flange 2 is provided on the outside of the control pipe 1, a thrust spring 3 is provided between the sliding block 4 and the limiting flange 2 to move the sliding block 4 toward the fixed block 7, the first support rod 6 and the second support rod abut against the inner wall of the pipe to be sprayed under the action of the thrust spring 3, the thrust spring 3 ensures that the free ends of the first support rod 6 and the second support rod can extend outward, so as to abut against the inner wall of the pipe at all times, and locate the position of the control pipe 1, the first support rod 6 and the second support rod are slidably connected to a roller sleeve 5 at one end away from the control pipe 1, and the sliding sleeve 53 of the roller sleeve 5 is provided on the A roller 52 is provided to ensure that the sliding sleeve 53 can slide on the support rod. A reset spring 51 is provided inside the roller sleeve 5 to push the roller sleeve 5 outward. A pressure sensor is provided between the reset spring 51 and the first support rod 6 and the second support rod. By arranging the reset spring 51 and the pressure sensor, it is ensured that the extension length or retraction length of the sliding sleeve 53 can be measured by the measured pressure of the reset spring 51, and the distance between the hinge point on the first support rod 6 and the second support rod to the inner wall of the pipeline is further calculated. When calculating the telescopic length of the reset spring 51, the spring itself can be used for calculation (Hooke's law, which will not be repeated). An angle sensor 61 is provided on the hinge point of the first support rod 6 and the second support rod. The angle α between the first support rod 6 and the second support rod is measured by the angle sensor 61, and then the inclination angle of the hypotenuse structure can be clearly calculated according to the triangle law. Further, the inclination angle of the spray head 10 can be controlled by the control sleeve 8, so that the spray head 10 can spray directly facing the hypotenuse structure 17 to ensure the spraying effect of the hypotenuse structure 17.

[0027] See also Figure 1 to Figure 8In addition, a sliding space 14 is provided inside the fixed block 7 of the present invention, and a control sleeve 8 extending from the inside of the sliding space 14 to one end of the fixed block 7 near the spray assembly is slidably connected inside the sliding space 14. The sliding of the control sleeve 8 drives the connecting rod 12 to move, thereby controlling the inclination angle of the spray head 10 through the movement of the control sleeve 8. Flanges 81 are provided at both ends of the control sleeve 8, and the flange 81 located inside the sliding space 14 is close to the inner wall of the sliding space 14. A compression spring 15 is provided on the outer sleeve of the control sleeve 8 to ensure that the control sleeve 8 can be reset. The interior of the sliding space 14 is filled with a hydraulic fluid 18. The position of the control sleeve 8 inside the sliding space 14 is controlled by controlling the flow of the hydraulic fluid 18, so as to further control the inclination angle of the spray head 10. A hydraulic control pipeline 13 is provided outside the sliding space 14, and the hydraulic control pipeline 13 is connected to the hydraulic mechanism. The pressure of the hydraulic fluid 18 is controlled by the hydraulic mechanism, so as to control the position of the control sleeve 8 inside the sliding space 14.

[0028] Furthermore, one end of the connecting rod 12 of the present invention is rotatably connected to the end of the control sleeve 8 located outside the sliding space 14 through the ring sleeve 20, a rotating bearing is provided between the ring sleeve body 201 and the control sleeve 8, and the rotating bearing is installed inside the mounting groove 82 of the control sleeve to ensure that the ring sleeve 20 can rotate on the control sleeve 8, and the movement of the control sleeve 8 can drive the rotating bearing and the ring sleeve 20 to move synchronously, and the outer wall of the rotating sleeve 9 is provided with a hinge seat 93, and the spray head 10 is rotatably connected to the hinge seat 93, and the ring sleeve 20 and the spray head 10 are driven to rotate synchronously through the rotation of the rotating sleeve 9 to prevent the ring sleeve 20 from affecting the rotation centrifugal spraying process of the spray head 10, and a spraying channel is opened inside the spray head 10, and the spraying channel is provided with an inlet pipe 11, and a supply pipe 92 is provided at the end of the rotating sleeve 9, and the supply pipe 92 is connected to the inlet pipe 11 through a hose to ensure that the spraying effect can be achieved while the spray head 10 and the rotating sleeve 9 are rotating, and to ensure that the angle of the spray head 10 can be adjusted normally.

[0029] Better yet, the interior of the rotating sleeve 9 of the present invention is provided with a connecting sleeve rotatably connected to the control tube 1, the exterior of the connecting sleeve is provided with a driven gear 91, the interior of the control tube 1 is provided with a driving motor for driving the connecting sleeve to rotate, the output shaft of the driving motor is provided with a driving gear meshing with the driven gear 91, the connecting sleeve is driven to rotate synchronously by the driving motor, thereby controlling the spray assembly to rotationally spray the inner wall of the pipeline, the interior of the control tube 1 is provided with a main pipe 19, the connecting sleeve is rotatably connected to the main pipe 19, the main pipe 19 supplies spray liquid to the interior of the spray assembly, to ensure a rotating centrifugal spraying process.

[0030] In this embodiment, combined with Figure 1 to Figure 8When in use, when it is necessary to spray the pipeline, the control pipe 1 is inserted into the inside of the corresponding pipeline. At this time, the roller sleeves 5 and the rollers 52 on the first support rod 6 and the second support rod abut against the inner wall of the pipeline. The rollers 52 are pressed against the inner wall of the pipeline by the thrust of the thrust spring 3 to locate the position of the control pipe 1. Then, when passing through the straight pipe, the telescopic distances of the roller sleeves 5 on the two support rods are the same, so that the inclination angle of the inner wall of the straight pipe can be calculated to be 0°. The hydraulic mechanism controls the hydraulic fluid 18 to move the control sleeve 8, and the control sleeve 8 drives the ring sleeve 20 to move, thereby vertically moving the spray head 10. Along the inner wall of the pipe, when passing through the bevel structure 17 of the pipe, the telescopic distances of the two support rods are different at this time, so the telescopic distance is calculated by the force of the reset spring 51, and the angle between the first support rod 6 and the second support rod is further measured by the angle sensor 61, and then the angle of the bevel structure 17 is calculated, and the nozzle 10 is further controlled to spray in a direction perpendicular to the bevel structure 17 to ensure the uniformity of the spraying of the bevel structure 17. In order to ensure the control accuracy of the nozzle 10, an angle sensor 61 can be set on the hinge seat 93 of the nozzle 10 to ensure the accuracy of the control of the nozzle 10.

[0031] In summary, the present invention provides a centrifugal pipe inner wall spraying device, comprising: a control tube extending to the inside of the pipe to be sprayed, through which the spraying assembly and the limiting assembly are penetrated into the inside of the pipe to be sprayed, to ensure that the inside of the pipe to be sprayed can be sprayed, the end of the control tube is provided with a limiting assembly for controlling the position of the control tube and a spraying assembly rotatably connected to the end of the control tube, to ensure that the axis of the control tube can be controlled to a position coincident with the axis of the pipe to be sprayed, further ensuring that the spraying assembly can uniformly spray the inside of the pipe; the limiting assembly comprises a fixed block fixedly arranged on the control tube and a sliding block slidably connected to the control tube, a plurality of support groups are arranged between the sliding block and the fixed block, each of the support groups is abutted against the inner wall of the pipe to be sprayed at one end away from the control tube, and by adjusting the distance between the sliding block and the fixed block, the support group can support the inner walls of pipes of different diameters, so that different The pipe of the diameter is sprayed; the spraying assembly includes a rotating sleeve rotatably connected to the end of the control pipe, at least one nozzle rotatably connected to the rotating sleeve and a connecting rod for controlling the inclination angle of the nozzle. When the support group moves to the bevel structure inside the pipe to be sprayed, the connecting rod controls the nozzle to rotate in the direction facing the bevel structure, thereby ensuring that the nozzle evenly sprays the inner wall of the bevel structure to prevent the bevel structure from being sprayed unevenly. At the same time, the inclination angle of the bevel structure is detected by the support group, thereby facilitating the control of the inclination angle of the nozzle to prevent the angle of the nozzle from not corresponding to the inclination angle of the bevel structure, and failing to evenly spray the bevel structure. In summary, the technical effect produced by the present invention is that by setting a device that can automatically adjust the angle of the nozzle, when the spraying device moves to the transition part of the variable diameter, the nozzle can be automatically facing the inner wall bevel structure, ensuring that the transition part can be evenly sprayed, and optimizing the spraying effect of the inner wall of the pipe.

[0032] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

Claims

1. A centrifugal pipe inner wall spraying device, characterized in that: include: A control tube extending into the interior of the pipeline to be sprayed, wherein the end of the control tube is provided with a limit assembly for controlling the position of the control tube and a spray assembly rotatably connected to the end of the control tube; The limiting assembly includes a fixed block fixed on the control tube and a sliding block slidably connected to the control tube, and a plurality of support groups are arranged between the sliding block and the fixed block, and one end of each support group away from the control tube abuts against the inner wall of the pipe to be sprayed; The spray assembly includes a rotating sleeve rotatably connected to the end of the control pipe, at least one spray head rotatably connected to the rotating sleeve, and a connecting rod for controlling the inclination angle of the spray head. When the support group moves to the bevel structure inside the pipeline to be sprayed, the connecting rod controls the spray head to rotate in the direction facing the bevel structure. The interior of the fixed block is provided with a sliding space, and the interior of the sliding space is slidably connected with a control sleeve extending from the interior of the sliding space to one end of the fixed block adjacent to the spraying assembly, and the sliding of the control sleeve drives the connecting rod to move, and flanges are provided at both ends of the control sleeve, and the flanges located inside the sliding space are tightly attached to the inner wall of the sliding space, and a compression spring is provided on the outer sleeve of the control sleeve, and the interior of the sliding space is filled with hydraulic fluid, and the position of the control sleeve inside the sliding space is controlled by controlling the flow of the hydraulic fluid, and a hydraulic control pipeline is provided outside the sliding space; Each of the support groups comprises: a first support rod rotatably connected to the fixed block; A second support rod rotatably connected to the sliding block, the second support rod rotatably connected to the first support rod, an angle sensor is provided at a hinge point of the first support rod and the second support rod, an articulated seat is provided on the outer wall of the rotating sleeve, the spray head is rotatably connected to the articulated seat, a spray channel is provided inside the spray head, the spray channel is provided with an inlet pipe, a supply pipe is provided at the end of the rotating sleeve, and the supply pipe is connected to the inlet pipe through a hose; One end of the connecting rod is rotatably connected to one end of the control sleeve located outside the sliding space through a ring sleeve, and a rotating bearing is provided between the ring sleeve and the control sleeve. The movement of the control sleeve drives the rotating bearing and the ring sleeve to move synchronously.

2. The centrifugal pipe inner wall spraying device according to claim 1 is characterized in that: A limiting flange is provided on the outside of the control tube, and a thrust spring is provided between the sliding block and the limiting flange to move the sliding block toward the fixed block. The first support rod and the second support rod abut against the inner wall of the pipe to be sprayed under the action of the thrust spring.

3. The centrifugal pipe inner wall spraying device according to claim 2 is characterized in that: The first support rod and the second support rod are slidably connected to a roller sleeve at one end away from the control tube, and a return spring is provided inside the roller sleeve to push the roller sleeve outward, and a pressure sensor is provided between the return spring and the first support rod and the second support rod.

4. The centrifugal pipe inner wall spraying device according to claim 3 is characterized in that: A connecting sleeve rotatably connected to the control tube is provided inside the rotating sleeve, a driven gear is provided outside the connecting sleeve, a driving motor for driving the connecting sleeve to rotate is provided inside the control tube, a driving gear meshing with the driven gear is provided on the output shaft of the driving motor, a main pipe is provided inside the control tube, and the connecting sleeve is rotatably connected to the main pipe.

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