A pressurized self-rotating spraying device suitable for spraying paint on the inner wall of a pipeline

Abstract

The application discloses a kind of pressurized self-rotating spraying devices suitable for pipeline inner wall paint spraying, it is related to building installation technical field, including sleeve, rotary nozzle and support positioning assembly, the sleeve one end closed arrangement, the other end open arrangement, in the coaxial fixed setting of sleeve open end with flow guide pipe, the input end of flow guide pipe is provided with flow control mechanism, the support positioning assembly includes three groups of support mechanism that are evenly distributed in the outer circumferential surface of sleeve, the support mechanism includes two installation blocks that are distributed along the axis of sleeve, the movable rod is rotatably arranged on the installation block, and the movable rod and the outer wall of sleeve are provided with support spring piece between.The application sets up support positioning assembly, can be adapted to different pipeline inner diameter, sleeve is positioned at the center position of pipe cover, rotary nozzle extends into pipeline interior and carries out spraying operation, paint is basically not leaked and pollutes external environment, reduces paint consumption, saves labor.

Description

Technical Field

[0001] This invention relates to the field of building installation technology, and in particular to a pressurized self-rotating spraying device suitable for painting the inner wall of pipes. Background Technology

[0002] Currently, some large public buildings, in order to control the usable floor height during the installation phase and ensure structural stability and aesthetic appearance, employ a method of pre-reserving through-beam openings by inserting sleeves into the building's structural beams. Cement is poured only after each sleeve is precisely positioned. During the installation phase, plumbing and electrical installers can directly lay various pipes and cable trays through the beams according to the designated sleeve openings. The installation process for the pre-reserved sleeves is as follows: purpose confirmation – size setting – cutting and fabrication – on-site positioning – reinforcement welding and securing – technical review – on-site pouring – rust removal from the inner wall of the sleeve – application of anti-corrosion paint to the inner wall of the sleeve.

[0003] A search revealed that Chinese Patent CN109013124B discloses a pipe inner wall spraying device, comprising an externally mounted pipe to be sprayed, a movable mounting cylinder coaxially positioned at the center of the inner wall of the pipe to be sprayed, and several guiding and adjusting movable structures extending at equal angles from the outer side of the movable mounting cylinder to the inner wall of the pipe to be sprayed. A conical liquid storage cylinder extends from the left end of the movable mounting cylinder, and an inlet pipe is horizontally embedded at the center of the left end of the conical liquid storage cylinder. A rotating pressure-boosting material guiding structure is embedded inside the movable mounting cylinder, and a conical spraying cylinder is rotatably mounted on the right side of the movable mounting cylinder. The guiding and adjusting movable structure includes several limiting guide mounting cylinders arranged at equal angles on the outer side of the movable mounting cylinder, and an electrically controlled winding wheel is semi-embedded and rotatably mounted at the bottom of each limiting guide mounting cylinder. This invention has the advantages of compact structural design, simple adjustment of pipe operating radius, smooth atomization spraying process, uniform atomization spraying, and good passability.

[0004] Although the above technical solution provides a smooth and uniform atomization spraying process, the power of the spraying device is rated and the amount of paint sprayed per unit time is fixed. Therefore, the speed at which the spraying device moves in the pipeline using a traction rope needs to be precisely controlled. Maintaining a suitable and uniform speed is essential to ensure a uniform paint surface. Stopping during the traction process or moving too fast will result in poor spraying effect. Thus, the spraying effect is greatly affected by the skill level of the operator. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of difficult operation and uncontrollable spraying volume in the prior art of spraying the inner wall of pipes, and to propose a pressurized self-rotating spraying device suitable for spraying the inner wall of pipes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pressurized self-rotating spraying device suitable for painting the inner wall of pipes includes a sleeve, a rotating nozzle, and a support and positioning assembly, wherein:

[0008] The sleeve is closed at one end and open at the other end. A guide tube is coaxially fixed at the open end of the sleeve. A flow control mechanism is provided at the input end of the guide tube. A paint inlet is provided at the closed end of the sleeve.

[0009] The rotary nozzle is rotatably and sealed at the open end of the sleeve. Multiple atomizing nozzles are evenly distributed on the outer circumferential surface of the rotary nozzle. A transmission rod extending into the guide tube is fixedly installed at the center of the rotary nozzle. Multiple curved impellers are fixedly installed on the outer wall of the portion of the transmission rod located inside the guide tube. When the paint passes through the guide tube, it impacts the curved impellers and drives the transmission rod to rotate.

[0010] The support and positioning assembly includes three sets of support mechanisms evenly distributed on the outer circumference of the sleeve. Each support mechanism includes two mounting blocks distributed along the axial direction of the sleeve. A movable rod is rotatably mounted on each mounting block. A support spring is provided between the movable rod and the outer wall of the sleeve. A connecting shaft is fixedly mounted on the outer end of the movable rod. The same connecting rod is rotatably mounted between the two connecting shafts to form a movable parallelogram structure. Support wheels are rotatably mounted at both ends of the connecting shaft. A friction structure is provided between the movable rod and the connecting rod to control the rotational flexibility of the support wheels.

[0011] Preferably, the friction structure includes a friction ring and a pressing ring slidably disposed on the connecting shaft. The friction ring and the pressing ring are located between the support wheel and the connecting rod, and a compression spring is disposed between the friction ring and the pressing ring. A contact ring is disposed on the opposite side of the pressing ring and the connecting rod. The two contact rings are provided with matching wedge-shaped notches. When the connecting rod moves away from the sleeve, the two contact rings rotate relative to each other, causing the pressing ring to move closer to the friction ring.

[0012] Preferably, a hexagonal prism is fixedly provided on the connecting shaft, and the friction ring and the pressure ring are provided with hexagonal holes that are adapted to the hexagonal prism.

[0013] Preferably, the outer circumferential surface of the support wheel has multiple suction cups evenly distributed.

[0014] Preferably, a top-curved baffle is fixedly installed on the sleeve, and the baffle is located on the side of the mounting block near the rotating nozzle, so that the angle between the movable rod and the axis of the sleeve does not exceed 90°.

[0015] Preferably, the curved impeller has four blades, and the top and bottom edges of the curved impeller are curved surfaces with a deviation of ∠°30.

[0016] Preferably, the outer edge of the curved impeller extends to the inner wall of the guide tube and has a gap with the inner wall of the guide tube.

[0017] Preferably, the flow control mechanism includes a pull rod that is slidably and sealed at the closed end of the sleeve. An installation plate is fixedly installed at one end of the pull rod inside the sleeve. A compression spring is provided between the installation plate and the sleeve. A plurality of axially arranged sealing ports are opened at one end of the guide pipe near the installation plate. A sealing plate that is slidably and sealed to the sealing ports is fixedly installed on the installation plate.

[0018] Preferably, the sealing port sidewall is provided with a sealing groove, and the sealing plate sidewall is provided with a sealing strip adapted to the sealing groove.

[0019] Preferably, the connection between the rotating nozzle and the sleeve is provided with an annular groove with a circular cross-section, and a plurality of lubricating balls are provided in the annular groove.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. This invention features a rotating nozzle that can rotate around a sleeve. The flowing paint impacts a curved impeller, driving the impeller to rotate and causing the entire rotating nozzle to rotate 360°. The paint is sprayed out as a mist, forming a ring on the inner wall of the pipe, resulting in more uniform paint spraying and simpler operation.

[0022] 2. By setting up a support and positioning component, this invention can adapt to different pipe inner diameters, position the sleeve at the center of the pipe sleeve, and make the sleeve coaxial with the pipe. The rotating nozzle extends into the pipe to carry out the spraying operation. The paint does not leak out and pollute the external environment, reducing paint consumption and saving labor.

[0023] 3. This invention employs a flow control mechanism. An external rope pulls a rod to move the rotating nozzle within the pipe. The traction force must overcome the frictional resistance between the device and the pipe's inner wall. Simultaneously, the pull rod is pulled outwards, compressing the second compression spring, opening the sealing plate and sealing opening to a certain width, allowing paint to enter the feed pipe for discharge. When the traction equipment stops, the sealing plate and sealing opening automatically close, preventing excessive paint buildup and wall adhesion caused by continuous spraying at the same location. Furthermore, the opening and closing size of the sealing plate and sealing opening varies depending on the traction speed. At higher traction speeds, the pull rod experiences greater force, exposing more of the sealing opening, resulting in faster paint intake and a larger spray volume. Because the rotating nozzle spends less time in the pipe at higher traction speeds, a larger spray volume ensures uniform coating on the pipe's inner wall. Similarly, at slower traction speeds, a smaller spray volume is used to prevent excessive coating. The device automatically adapts to the traction speed, adjusting the spray volume and reducing overall operational complexity.

[0024] 4. This invention, by setting a friction structure, creates a certain frictional force between the support wheel and the connecting shaft. During traction, this provides resistance to overcome the elastic force of the compression spring, thus enabling the opening and closing of the sealing port. Furthermore, by utilizing the wedge-shaped notch on the contact ring, the angle of the movable rod varies when spraying pipes with different inner diameters. This change in the distance between the pressure ring and the friction ring alters the frictional resistance of the friction ring on the support wheel. When spraying large-diameter pipes, the larger inner wall area requires a larger amount of coating. The compression spring provides greater resistance, resulting in a greater traction force needed to overcome the resistance, a larger exposed sealing port, and a larger coating amount. Conversely, the same principle applies. This facilitates automatic adaptation of the corresponding spraying flow rate for different pipe diameters. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of pipes, as proposed in this invention.

[0026] Figure 2 This is a right-side structural schematic diagram of a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of a pipe, as proposed in this invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of a pipe, as proposed in this invention.

[0028] Figure 4 This is a schematic diagram of the flow control mechanism in a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of pipes, as proposed in this invention.

[0029] Figure 5 This is a schematic diagram of the guide pipe in a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of pipes, as proposed in this invention.

[0030] Figure 6 This is a schematic diagram of the rotating nozzle in a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of pipes, as proposed in this invention.

[0031] Figure 7 This is an exploded structural diagram of the friction structure in a pressurized self-rotating spraying device suitable for spraying paint on the inner wall of pipes, as proposed in this invention.

[0032] Figure 8 This is a partial cross-sectional view of a pressurized self-rotating spraying device suitable for painting the inner wall of pipes, as proposed in this invention.

[0033] In the diagram: 1. Sleeve; 11. Guide pipe; 111. Sealing port; 112. Sealing groove; 12. Baffle; 13. Paint inlet; 2. Rotary nozzle; 21. Atomizing nozzle; 22. Drive rod; 23. Curved impeller; 3. Support and positioning assembly; 31. Mounting block; 32. Movable rod; 33. Connecting shaft; 331. Friction ring; 332. Pressure ring; 333. Compression spring one; 334. Contact ring; 335. Wedge notch; 336. Hexagonal column; 34. Connecting rod; 35. Support wheel; 351. Suction cup; 36. Support spring; 4. Flow control mechanism; 41. Pull rod; 42. Mounting plate; 43. Sealing plate; 431. Sealing strip; 44. Compression spring two; 5. Ring groove; 51. Lubricating ball. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Reference Figure 1-3 A pressurized self-rotating spraying device suitable for painting the inner wall of pipes includes a sleeve 1, a rotating nozzle 2, and a support and positioning assembly 3. The support and positioning assembly 3 stably supports the sleeve 1 at the axial position of the pipe. The rotating nozzle 2 works in conjunction with the sleeve to spray the inner wall of the pipe. Under the impact of the flowing paint, the rotating nozzle 2 is driven to rotate 360°, spraying the paint into a mist-like shape, forming a ring on the inner wall of the pipe. This pulls the sleeve 1 to move along the pipe axis, achieving comprehensive spraying of the inner wall of the pipe. During use, the rotating nozzle 2 extends into the inside of the pipe to perform the spraying operation. The paint does not leak out and pollute the external environment, reducing paint consumption and saving labor.

[0037] The sleeve 1 is closed at one end and open at the other end. A guide pipe 11 is coaxially fixed at the open end of the sleeve 1. The guide pipe 11 and the sleeve 1 are in a closed state. The paint entering the sleeve 1 can only flow out from the guide pipe 11. A flow control mechanism 4 is provided at the input end of the guide pipe 11 to control the flow rate of the paint and realize the control of the spraying amount of the rotary nozzle 2. A paint inlet 13 is provided at the closed end of the sleeve 1, which is connected to an external pressurized paint sprayer through a conduit to realize the pressurized introduction of paint.

[0038] Reference Figure 3-5 The flow control mechanism 4 includes a pull rod 41 that is slidably and sealed at the closed end of the sleeve 1. In use, a rope is connected to the outer end of the pull rod 41 for traction of the entire device. A mounting plate 42 is fixedly installed at one end of the pull rod 41 inside the sleeve 1. A compression spring 44 is installed between the mounting plate 42 and the sleeve 1. The sleeve 1 is supported in the pipe by the support and positioning assembly 3. When the pull rod 41 is pulled by the rope, it will drive the pull rod 41 to move outward and compress the compression spring 44. After the compression spring 44 is compressed, its elasticity increases until the elasticity exceeds the resistance of the spraying device in the pipe, thus pulling the spraying device to move outward. The guide pipe 11 has multiple axially arranged seals at one end near the mounting plate 42. A sealing plate 43 is fixedly installed on the mounting plate 42 and is slidably connected to the sealing port 111. When the pull rod 41 moves outward, it will drive the mounting plate 42 away from the guide pipe 11, so that the sealing plate 43 slides outward from the sealing port 111, exposing the sealing port 111. At this time, the paint in the sleeve 1 enters the guide pipe 11 through the sealing port 111 and is sprayed out from the rotating nozzle 2. When spraying in a long pipe, it is difficult to complete the traction in one go. When the traction of the pull rod 41 is stopped in the middle, the compression spring 44 returns to its original position, so that the sealing plate 43 closes the sealing port 111 again, preventing the rotating nozzle 2 from continuously spraying the same position, which would cause the paint to be sprayed too thickly and stick to the wall. The operation is simple.

[0039] During the spraying process, the traction speed often varies due to operator habits. Since the power of the external pressure sprayer is fixed, different traction speeds result in different dwell times for the spraying device within the pipe. Excessive dwell time leads to overly thick paint, while insufficient dwell time results in thin paint or even unpainted areas. The frictional resistance of this spraying device is constant within the same pipe. Because the elasticity of the compression spring 44 is proportional to its length, the pull rod 41 experiences greater tension during rapid traction of the spraying device, thus compressing the compression spring 44 a greater distance. The mounting plate 42 moves the sealing plate 43 a greater distance, resulting in a larger exposed area of ​​the sealing opening 111 and faster paint feeding, thus increasing the spraying volume. Therefore, at a faster traction speed, a larger spraying volume can achieve a better spraying effect. When the spraying device is pulled at a slower speed, the traction force on the pull rod 41 is smaller, the compression amount of the compression spring 44 is smaller, and the exposed area of ​​the sealing opening 111 is smaller. At this time, the paint feeding volume is smaller, and the spraying volume of the rotating nozzle 2 is reduced. Therefore, at a slower traction speed, a smaller spraying volume can still achieve a better spraying effect.

[0040] Reference Figure 4-5The sealing port 111 has a sealing groove 112 on its side wall, and the sealing plate 43 has a sealing strip 431 that matches the sealing groove 112 on its side wall. The cooperation between the sealing groove 112 and the sealing strip 431 helps to improve the stability of the connection between the sealing plate 43 and the sealing port 111, and can also improve the sealing performance between the sealing plate 43 and the sealing port 111, reducing paint leakage.

[0041] Reference Figure 3 and 6 The rotary nozzle 2 is sealed and rotated at the open end of the sleeve 1. The interior of the rotary nozzle 2 is connected to the guide pipe 11. The paint enters the interior of the rotary nozzle 2 after passing through the guide pipe 11. Multiple atomizing nozzles 21 are evenly distributed on the outer circumference of the rotary nozzle 2. The high-pressure paint is sprayed out through the atomizing nozzles 21 inside the rotary nozzle 2, forming atomized particles that are evenly sprayed on the inner wall of the pipe. A transmission rod 22 extending into the guide pipe 11 is fixedly installed at the center of the rotary nozzle 2. Multiple curved impellers 23 are fixedly installed on the outer wall of the part of the transmission rod 22 located inside the guide pipe 11. When the paint passes through the guide pipe 11, it impacts the curved impellers 23, driving the transmission rod 22 to rotate. The paint flows in the guide pipe 11 and impacts the curved impellers 23, generating a lateral force on the curved impellers 23. As the paint continues to flow, it drives the transmission rod 22 to rotate continuously, and at the same time drives the rotary nozzle 2 to rotate, spraying the inner wall of the pipe in all directions.

[0042] Reference Figure 6 The curved impeller 23 has four blades. The top and bottom edges of the curved impeller 23 have a deviation of ∠30°. Under the premise of ensuring that the active driving force drives the transmission rod 22 to rotate, the deviation of ∠30° helps to reduce the generation of turbulence when the paint flows and reduce the risk of voids appearing inside the rotating nozzle 2.

[0043] Reference Figure 3 The outer edge of the curved impeller 23 extends to the inner wall of the guide tube 11 and has a gap with the inner wall of the guide tube 11, so that the impact force of the paint flow can fully interact with the curved impeller 23.

[0044] Reference Figure 3 A circular groove 5 with a circular cross-section is provided at the connection between the rotating nozzle 2 and the sleeve 1. Multiple lubricating balls 51 are provided in the groove 5 to maintain smooth rotation between the sleeve 1 and the rotating nozzle 2 and reduce friction.

[0045] The support and positioning assembly 3 includes three sets of support mechanisms evenly distributed on the outer circumference of the sleeve 1. The three support mechanisms, which are equidistantly distributed, can stably support the sleeve 1 in the center of the pipe, ensuring that the distance between each atomizing nozzle 21 on the rotating nozzle 2 and the inner wall of the pipe is equal.

[0046] The support mechanism includes two mounting blocks 31 distributed along the axial direction of the sleeve 1. A movable rod 32 is rotatably mounted on the mounting block 31. A support spring 36 is provided between the movable rod 32 and the outer wall of the sleeve 1. Through the elastic force of the support spring 36, the movable rod 32 tends to expand outward, generating sufficient support force on the inner wall of the pipe. A connecting shaft 33 is fixedly mounted on the outer end of the movable rod 32. The same connecting rod 34 is rotatably mounted between the two connecting shafts 33. The length of the connecting rod 34 is consistent with the distance between the two mounting blocks 31, forming a movable parallelogram structure. The parallelogram structure can ensure that the connecting rod 34 always remains parallel to the sleeve 1 during the opening and closing process, thereby improving the stability of the support.

[0047] Reference Figure 1-3 A top-curved baffle 12 is fixedly installed on the sleeve 1. The baffle 12 is located on the side of the mounting block 31 near the rotating nozzle 2, so that the angle between the movable rod 32 and the axis of the sleeve 1 does not exceed 90°. The baffle 12 limits the movable rod 32 to prevent the movable rod 32 from rotating too much, so that the movable rod 32 is always in an inclined state. The position of the rotating nozzle 2 can always be kept above the position of the connecting rod 34, preventing the connecting rod 34 from entering the spraying range of the rotating nozzle 2 and interfering with the spraying operation. When in use, the device is inserted into the pipe, and the movable rod 32 deflects to the traction direction. The tension generated during traction acts on the side of the movable rod 32 near the traction direction, which will generate a component force towards the inner wall of the pipe, improving the stability of the spraying device during movement.

[0048] Support wheels 35 are rotatably mounted at both ends of the connecting shaft 33. The rolling action between the support wheels 35 and the inner wall of the pipe replaces sliding, preventing damage to the inner wall of the pipe. The friction between the connecting shaft 33 and the support wheels 35 acts as resistance to the movement of the spraying device. A friction structure is provided between the movable rod 32 and the connecting rod 34 to control the rotational flexibility of the support wheels 35. By changing the friction between the connecting shaft 33 and the support wheels 35, the required traction force to drive the spraying device can be changed, thereby changing the amount of paint sprayed by the spraying device during normal operation.

[0049] For pipes with different inner diameters, the larger the inner diameter, the larger the inner wall area; the smaller the inner diameter, the smaller the inner wall area. Under the same working conditions, pipes with larger diameters require a larger amount of paint, while pipes with smaller diameters require a smaller amount of paint. By controlling the friction force between the support wheel 35 and the connecting shaft 33 through a friction structure, greater friction is provided when spraying pipes with larger diameters. The greater the resistance that the traction spraying device needs to overcome, the greater the tension on the pull rod 41, the larger the exposed area of ​​the sealing port 111, and the faster the paint feed, resulting in a larger amount of paint. Conversely, when spraying pipes with smaller diameters, less friction is provided. The less resistance that the traction spraying device needs to overcome, the less the tension on the pull rod 41, the smaller the exposed area of ​​the sealing port 111, and the smaller the amount of paint feed, resulting in a smaller amount of paint. This achieves adaptive control of the amount of paint sprayed when spraying pipes with different inner diameters, ensuring spraying quality.

[0050] Reference Figure 7-8 The friction structure includes a friction ring 331 and a pressing ring 332 slidably disposed on a connecting shaft 33. The friction ring 331 and the pressing ring 332 are located between the support wheel 35 and the connecting rod 34, and a compression spring 333 is disposed between the friction ring 331 and the pressing ring 332. The compression spring 333 applies pressure to the friction ring 331 and the pressing ring 332, causing the friction ring 331 to abut against the side wall of the support wheel 35 and the pressing ring 332 to abut against the connecting rod 34. The contact wheel 35 provides rotational resistance to the support wheel 35. When the spring force of the compression spring 333 changes, the friction force between the friction ring 331 and the support wheel 35 changes, and the rotational resistance also changes accordingly. Contact rings 334 are provided on the opposing sides of the pressure ring 332 and the connecting rod 34. The two contact rings 334 have matching wedge-shaped notches 335. When the connecting rod 34 moves away from the sleeve 1, the two contact rings 334 rotate relative to each other, causing the pressure ring 332 to move closer to the friction ring 331. When spraying large-diameter pipes, the connecting rod 34 needs to be moved away from the sleeve 1. At this time, the two contact rings 334 rotate relative to each other, and the tops of the two wedge-shaped notches 335 move closer to each other, causing the pressure ring 332 to compress the compression spring 333, thereby increasing the friction between the friction ring 331 and the support wheel 35. Under these circumstances, a larger traction force is required to drive the spraying device to move, thus achieving spraying with a larger spray volume. When spraying small-diameter pipes, the connecting rod 34 needs to be moved closer to the sleeve 1. At this time, the two contact rings 334 rotate relative to each other, and the tops of the two wedge-shaped notches 335 move away from each other. The top of one wedge-shaped notch 335 enters the bottom of the other wedge-shaped notch 335, causing the pressure ring 332 to release the compression spring 333, thereby reducing the friction between the friction ring 331 and the support wheel 35. Under these circumstances, a smaller traction force is required to drive the spraying device to move, thus achieving spraying with a smaller spray volume.

[0051] Reference Figure 7-8 A hexagonal post 336 is fixedly installed on the connecting shaft 33. The friction ring 331 and the pressing ring 332 have hexagonal holes that are adapted to the hexagonal post 336. When the connecting rod 34 and the movable rod 32 rotate relative to each other, causing the two contact rings 334 to rotate relative to each other, the hexagonal post 336 can reduce the circumferential deflection of the friction ring 331 and the pressing ring 332 without affecting the axial sliding of the friction ring 331 and the pressing ring 332.

[0052] Reference Figure 7-8 Multiple suction cups 351 are evenly distributed on the outer circumference of the support wheel 35. The suction cups 351 adsorb with the inner wall of the pipe to generate suction force, which increases the friction between the support wheel 35 and the inner wall of the pipe and prevents the support wheel 35 from slipping directly when the rotational resistance between the friction ring 331 and the support wheel 35 is greater than the friction between the support wheel 35 and the inner wall of the pipe.

[0053] The specific working principle of this invention is as follows:

[0054] In use, the paint inlet 13 is connected to an external pressure sprayer through a conduit, and a rope is connected to the outer end of the pull rod 41. The end of the sleeve 1 with the rotating nozzle 2 is inserted into the pipe to be sprayed. Through the elastic force of the support spring 36, the movable rod 32 is extended outward, which drives the connecting rod 34 to move outward until the support wheel 35 is pressed against the inner wall of the pipe.

[0055] Push the spraying device to the end of the pipe and start the pressurized spray gun. The paint enters the sleeve 1 through the conduit. At this time, the sealing port 111 is closed by the sealing plate 43. Pull the rope to pull the spraying device back. When the rope pulls the pull rod 41, it will drive the pull rod 41 to move outward and compress the compression spring 44. After the compression spring 44 is compressed, the elastic force increases until the elastic force exceeds the resistance between the support wheel 35 and the friction ring 331. The spraying device begins to move outward. At the same time, when the pull rod 41 moves outward, it will drive the mounting plate 42 away from the guide pipe 1. 1. This causes the sealing plate 43 to slide outward from the sealing port 111, exposing the sealing port 111. At this time, the paint in the sleeve 1 enters the guide pipe 11 through the sealing port 111. The paint flows in the guide pipe 11 and impacts the curved impeller 23, which will generate a lateral force on the curved impeller 23. As the paint continues to flow, the drive rod 22 rotates continuously, which in turn drives the rotating nozzle 2 to rotate. Finally, the paint is sprayed out through the atomizing nozzle 21 in the rotating nozzle 2 to form atomized particles, which are evenly sprayed on the inner wall of the pipe until the spraying equipment is pulled out of the pipe, completing the spraying.

[0056] When the traction speed changes, the opening and closing size of the sealing plate 43 and the sealing port 111 are different according to the traction speed. When the traction speed is faster, the pull rod 41 is subjected to greater force, the sealing port 111 is exposed more, the paint feed is faster, and the spraying volume is larger. Since the residence time of the rotating nozzle 2 in the pipe is shorter when the traction speed is faster, the larger spraying volume can ensure that the inner wall of the pipe is sprayed evenly. Similarly, when the traction speed is slower, a smaller spraying volume is used to prevent the spraying from being too thick, so as to automatically adapt to the traction speed and adjust the spraying volume.

[0057] When spraying different pipes, the friction force between the support wheel 35 and the connecting shaft 33 is controlled by the friction structure. The different angles of the movable rod 32 are opened, and the change in the distance between the pressure ring 332 and the friction ring 331 will change the magnitude of the friction resistance of the friction ring 331 to the support wheel 35. This enables adaptive control of the spraying amount when spraying different pipe inner diameters, ensuring the spraying quality.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pressurized self-rotating spraying device suitable for painting the inner wall of pipes, characterized in that, Includes a sleeve (1), a rotating nozzle (2), and a support and positioning assembly (3), wherein: The sleeve (1) is closed at one end and open at the other end. A guide pipe (11) is coaxially fixed at the open end of the sleeve (1). A flow control mechanism (4) is provided at the input end of the guide pipe (11). A paint inlet (13) is provided at the closed end of the sleeve (1). The rotary nozzle (2) is sealed and rotated at the open end of the sleeve (1). Multiple atomizing nozzles (21) are evenly distributed on the outer circumferential surface of the rotary nozzle (2). A transmission rod (22) extending into the guide tube (11) is fixedly provided at the center of the rotary nozzle (2). Multiple curved impellers (23) are fixedly provided on the outer wall of the part of the transmission rod (22) located inside the guide tube (11). When the paint passes through the guide tube (11), it impacts the curved impellers (23) and drives the transmission rod (22) to rotate. The support positioning component (3) includes three sets of support mechanisms evenly distributed on the outer periphery of the sleeve (1). The support mechanism includes two mounting blocks (31) distributed along the axial direction of the sleeve (1). A movable rod (32) is rotatably mounted on the mounting block (31). A support spring (36) is provided between the movable rod (32) and the outer wall of the sleeve (1). A connecting shaft (33) is fixedly mounted on the outer end of the movable rod (32). The same connecting rod (34) is rotatably mounted between the two connecting shafts (33) to form a movable parallelogram structure. Support wheels (35) are rotatably mounted on both ends of the connecting shaft (33). A friction structure for controlling the rotation flexibility of the support wheels (35) is provided between the movable rod (32) and the connecting rod (34). The flow control mechanism (4) includes a pull rod (41) that is slidably and sealed at the closed end of the sleeve (1). A mounting plate (42) is fixedly installed at one end of the pull rod (41) inside the sleeve (1). A compression spring (44) is installed between the mounting plate (42) and the sleeve (1). A plurality of axially arranged sealing ports (111) are opened at one end of the guide pipe (11) near the mounting plate (42). A sealing plate (43) that is slidably and sealed to the sealing ports (111) is fixedly installed on the mounting plate (42).

2. The pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The friction structure includes a friction ring (331) and a pressing ring (332) slidably disposed on the connecting shaft (33). The friction ring (331) and the pressing ring (332) are located between the support wheel (35) and the connecting rod (34). A compression spring (333) is provided between the friction ring (331) and the pressing ring (332). A contact ring (334) is provided on the opposite side of the pressing ring (332) and the connecting rod (34). The two contact rings (334) are provided with matching wedge-shaped notches (335). When the connecting rod (34) moves away from the sleeve (1), the two contact rings (334) rotate relative to each other, causing the pressing ring (332) to move closer to the friction ring (331).

3. A pressurized self-rotating spraying device suitable for painting the inner wall of pipes according to claim 2, characterized in that, A hexagonal post (336) is fixedly installed on the connecting shaft (33), and the friction ring (331) and the pressing ring (332) have hexagonal holes in the center that are adapted to the hexagonal post (336).

4. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The outer circumferential surface of the support wheel (35) has multiple suction cups (351) evenly distributed.

5. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, A top-curved baffle (12) is fixedly installed on the sleeve (1). The baffle (12) is located on the side of the mounting block (31) near the rotating nozzle (2) so that the angle between the movable rod (32) and the axis of the sleeve (1) does not exceed 90°.

6. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The curved impeller (23) consists of four blades, and the top and bottom edges of the curved impeller (23) are curved surfaces with a deviation of ∠30°.

7. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The outer edge of the curved impeller (23) extends to the inner wall of the guide tube (11) and has a gap with the inner wall of the guide tube (11).

8. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The sealing port (111) has a sealing groove (112) on its side wall, and the sealing plate (43) has a sealing strip (431) that matches the sealing groove (112) on its side wall.

9. A pressurized self-rotating spraying device for painting the inner wall of pipes according to claim 1, characterized in that, The rotating nozzle (2) is connected to the sleeve (1) with a circular groove (5) and a plurality of lubricating balls (51) are provided in the groove (5).

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