A rotary spray gun

Abstract

The present application relates to a kind of rotary spray gun, including shell, outer tube, inner tube and driving piece, outer tube is rotatably arranged on shell, inner tube is arranged on outer tube, one end of inner tube is equipped with spray head, the other end is equipped with integrated joint for controlling the opening and closing of rotary spray gun and air intake feed, outer tube is equipped with air nozzle for changing the direction of coating movement, driving piece is used to drive air nozzle rotation around spray head, the air outlet direction of air nozzle is towards the center line of spray head, and the included angle with the spray direction of spray head is A, 45 ° ≤A ≤150 °;Inner tube is in the same straight line with spray head.The rotary spray gun obtained by the present application has the following advantages: the gas sprayed by air nozzle can be sprayed in various directions with rotation, compressed air can carry the paint coming out of spray head to move in various directions, realizing the spraying of annular outer side surface;Inner tube is in the same straight line with spray head, so that the paint moves in a straight line, reducing bending, preventing paint from accumulating at the bending place to cause blockage.

Description

Technical Field

[0001] This invention relates to the field of spray gun technology, and in particular to a rotary spray gun. Background Technology

[0002] A spray gun is a device that uses the rapid release of liquid or compressed air as power. It is usually used to spray paint forward for coating the outer surface of objects. However, for spraying the inner walls of deep holes or pipes, it is necessary to spray at an angle and change the angle, which is complicated to operate. In addition, if there are stepped surfaces on the hole, the radial stepped surfaces cannot be effectively sprayed. Summary of the Invention

[0003] One object of this application is to provide a rotary spray gun suitable for spraying inside holes or pipes.

[0004] The technical solution adopted in this application is as follows: a rotary spray gun, including a housing, an outer tube, an inner tube, and a driving component. The outer tube is rotatably mounted on the housing, and the inner tube is mounted on the outer tube. One end of the inner tube is provided with a nozzle, and the other end is provided with an integrated connector for controlling the opening and closing of the rotary spray gun and for air and material feeding. The outer tube is provided with an air nozzle for changing the direction of paint movement. The driving component is used to drive the air nozzle to rotate around the nozzle. The air outlet direction of the air nozzle is towards the center line of the nozzle, and the angle between the air outlet and the spray direction of the nozzle is A, where 45°≤A≤150°. The inner tube and the nozzle are on the same straight line.

[0005] Compared with the prior art, the advantages of this application are as follows: the inner tube is used for the movement of paint, and the space between the outer tube and the inner tube is used for the movement of compressed air; the nozzle is used to spray paint, and the air nozzle is used to spray compressed air; the driving component drives the air nozzle to rotate around the nozzle, which allows the gas sprayed from the air nozzle to be sprayed in all directions as it rotates, and the air outlet direction of the air nozzle intersects with the paint outlet direction of the nozzle, so the compressed air can carry the paint coming out of the nozzle in all directions, realizing the spraying of the annular outer surface, which is particularly suitable for the inner wall surface of deep holes. The rotating spray gun only needs to move in the axial direction of the hole to achieve uniform spraying of the inner wall surface of the hole; within the range of 45°≤A≤150°, the effect of the compressed gas sprayed from the air nozzle on changing the direction of the paint coming out of the nozzle is good; the inner tube and the nozzle are on the same straight line, which makes the paint move in a straight line, reduces bending, and prevents the paint from accumulating at the bend and causing blockage.

[0006] In some embodiments of this application, one end of the outer tube is located inside the housing, and the other end extends outside the housing; an end cap is provided at the end of the outer tube away from the housing, and an air nozzle is provided on the end cap, which has a through hole for accommodating the nozzle.

[0007] Furthermore, at least part of the nozzle extends out of the end cap through the through hole; the gap between the nozzle and the through hole forms an air outlet channel, and the air outlet direction of the air outlet channel is the same as the extension direction of the inner tube from the integrated joint to the nozzle; the inner diameter surface and the outer diameter surface of the end of the air outlet channel are arranged in parallel; the gap between the nozzle and the through hole is B, 0.1mm≤B≤0.5mm.

[0008] In some embodiments of this application, the integrated connector is provided with a piston chamber and a starting compressed air inlet communicating with the piston chamber. A slidable piston is provided in the piston chamber, and a pin is provided on the piston. One end of the pin is fixedly connected to the piston, and the other end passes through the inner tube. When the pin blocks the nozzle, at least part of the pin extends out of the nozzle.

[0009] Furthermore, the piston chamber is provided with a reset spring or the integrated connector is provided with a reset compressed air inlet, and the reset spring or reset compressed air inlet and the start compressed air inlet are respectively located on both sides of the piston.

[0010] Furthermore, at least one first seal is provided between the ejector pin and the integrated connector to isolate the piston chamber from the inner tube, and a second seal is provided between the piston and the wall of the piston chamber; the cross-sectional area of ​​the ejector pin sealing end gradually decreases from the outside to the inside.

[0011] In some embodiments of this application, the integrated connector is provided with a diffusion chamber and an atomized compressed air inlet communicating with the diffusion chamber. The diffusion chamber is connected to the outer pipe, and the cross-sectional area of ​​the diffusion chamber is larger than the cross-sectional area of ​​the outer pipe cavity. The integrated connector is provided with a paint inlet communicating with the inner pipe.

[0012] In some embodiments of this application, the distance between the nozzle and the air nozzle in the axial direction of the inner tube is C, where 1.5mm ≤ C ≤ 5mm; the distance between the nozzle and the air nozzle in the radial direction of the inner tube is D, where 3mm ≤ D ≤ 6mm.

[0013] In some embodiments of this application, a first bearing is sleeved on the outer tube, the inner side of the first bearing is in contact with the outer tube, and the outer side of the first bearing is in contact with the inner wall of the housing; a second bearing is sleeved on the outer tube, the inner side of the second bearing is in contact with the outer tube, and the outer side of the second bearing is in contact with the inner wall of the housing; the first bearing and the second bearing are arranged at intervals.

[0014] Furthermore, a support spring and a sealing gasket are also fitted on the outer tube. One end of the support spring is attached to the integrated joint, and the other end is attached to one end of the sealing gasket. The other end of the sealing gasket is attached to the first bearing. The drive component is connected to the outer tube through a transmission assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2This is a cross-sectional view of Embodiment 1 of the present invention; Figure 3 yes Figure 2 Enlarged view of part E in the image; Figure 4 This is a schematic diagram of the transmission assembly according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0016] In the diagram: 1. Housing; 2. Outer tube; 3. Inner tube; 4. Drive component; 5. Nozzle; 6. Integrated connector; 7. Air nozzle; 8. End cap; 9. Through hole; 10. Air outlet channel; 11. Piston chamber; 12. Starting compressed air inlet; 13. Piston; 14. Ejector pin; 15. Return spring; 16. Return compressed air inlet; 17. Diffuser chamber; 18. Atomizing compressed air inlet; 19. Paint inlet; 20. First bearing; 21. Second bearing; 22. Support spring; 23. Sealing gasket; 24. Transmission assembly; 25. First gear; 26. Second gear; 27. First seal; 28. Second seal; 29. ​​Transmission housing; 30. Package housing; 31. Fixing clip; 32. Mounting hole. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0018] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0019] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "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 application 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, the above terms should not be construed as limitations on this application.

[0020] Example 1: This embodiment provides a rotary spray gun, such as Figure 1 , Figure 2 , Figure 3As shown, the device includes a housing 1, an outer tube 2, an inner tube 3, and a drive unit 4. The outer tube 2 is rotatably mounted on the housing 1, and the inner tube 3 is mounted on the outer tube 2. One end of the inner tube 3 is equipped with a nozzle 5, and the other end is equipped with an integrated connector 6 for controlling the opening and closing of the rotary spray gun and for air and material feeding. The outer tube 2 is equipped with an air nozzle 7 for changing the direction of paint movement. The drive unit 4 is used to drive the air nozzle 7 to rotate around the nozzle 5. The air outlet direction of the air nozzle 7 is towards the center line of the nozzle 5, and the angle between the air nozzle 7 and the spray direction of the nozzle 5 is A, 45°≤A≤150°. The angle A is preferably 60°≤A≤120°, and in this embodiment, the angle A is 90°. The integrated connector 6 is connected to the housing 1, one end of the inner tube 3 is connected to the nozzle 5, and the other end is connected to the integrated connector 6. The integrated connector 6, the inner tube 3, and the nozzle 5 are on the same straight line.

[0021] The inner tube 3 is used for the movement of the paint, and the space between the outer tube 2 and the inner tube 3 is used for the movement of compressed air; the nozzle 5 is used to spray out the paint, and the air nozzle 7 is used to spray out the compressed air; the driving component 4 drives the air nozzle 7 to rotate around the nozzle 5, so that the gas sprayed out by the air nozzle 7 can be sprayed out in all directions as it rotates, and the air outlet direction of the air nozzle 7 intersects with the paint outlet direction of the nozzle 5. The compressed air can also carry the paint coming out of the nozzle 5 in all directions to achieve spraying on the outer surface of the ring, which is especially suitable for the inner wall surface of deep holes. The rotating spray gun only needs to move in the axial direction of the hole to achieve uniform spraying on the inner wall surface of the hole; within the range of 45°≤A≤150°, the effect of the compressed gas sprayed out by the air nozzle 7 on changing the direction of the paint coming out of the nozzle 5 is good.

[0022] To ensure reliable installation of the outer tube 2, one end of the outer tube 2 is located inside the housing 1, and the other end extends outside the housing 1. A removable end cap 8 is provided at the end of the outer tube 2 furthest from the housing 1, and an air nozzle 7 is mounted on the end cap 8. The end cap 8 has a through hole 9 for accommodating the spray head 5. The outer tube 2 extending outwards facilitates operation by reaching into the opening, while the outside of the spray head 5 and air nozzle 7 remains unobstructed, facilitating spraying. The end cap 8 serves both to seal the outer end of the outer tube 2 and to allow for observation of the internal condition of the outer tube 2 after removal. Furthermore, removing the end cap 8 facilitates replacement and maintenance of the spray head 5.

[0023] In this embodiment, the through hole 9 is tapered to facilitate its fit with the nozzle 5; the end cap 8 is fixedly connected to the outer tube 2, and the end cap 8 and the outer tube 2 are arranged concentrically. The diameter of the end cap 8 is the same as the diameter of the outer tube 2 to prevent protrusions at the connection between the end cap 8 and the outer tube 2, and to prevent the formation of a sharp cutting surface after the outer tube 2 rotates, thus improving safety. The end cap 8 and the nozzle 7 can be separate structures or integrally formed. A separate structure facilitates the replacement and maintenance of the nozzle 7, while integral forming provides high structural strength for the end cap 8 and the nozzle 7. In this embodiment, the end cap 8 is provided with a mounting hole 32, one end of the nozzle 7 is connected to the mounting hole 32, and the mounting hole 32 communicates with the outer tube 2.

[0024] To ensure the spraying effect, at least part of the nozzle 5 extends out of the end cap 8 through the through hole 9, and the inner tube 3 and the nozzle 5 are on the same straight line. The gap between the nozzle 5 and the through hole 9 forms an air outlet channel 10, and the air outlet direction of the air outlet channel 10 is the same as the extension direction of the inner tube 3 from the integrated joint 6 to the nozzle 5. The inner diameter surface and the outer diameter surface of the end of the air outlet channel 10 are arranged in parallel. The nozzle 5 extending out of the end cap 8 ensures that the nozzle 5 is not blocked by the end cap 8, thus ensuring the paint spraying effect. The inner tube 3 and the nozzle 5 are on the same straight line, which makes the paint move in a straight line, reduces bending, and prevents the paint from accumulating at the bending points and causing blockage. The design of the air outlet channel 10 can form a guiding airflow on the outside of the nozzle 5 to guide the paint and prevent the paint from spreading outward too quickly. The parallel arrangement of the inner diameter surface and the outer diameter surface of the end of the air outlet channel 10 makes the gas sprayed from the air outlet channel 10 form a long ring shape, which has the effect of binding the paint.

[0025] The gap B between the nozzle 5 and the through hole 9 is 0.1mm ≤ B ≤ 0.5mm. Within this range of 0.1mm ≤ B ≤ 0.5mm, compressed gas can be ejected from the air outlet channel 10 without the airflow from the air outlet channel 10 being too large, which would affect the change of the paint direction by the nozzle 7. In this embodiment, the gap B is 0.3mm.

[0026] To ensure reliable control of the integrated connector 6, the integrated connector 6 is provided with a piston chamber 11 and a starting compressed air inlet 12 communicating with the piston chamber 11. A slidable piston 13 is provided inside the piston chamber 11, and a ejector pin 14 is provided on the piston 13. One end of the ejector pin 14 is fixedly connected to the piston 13, and the other end passes through the inner tube 3. When the ejector pin 14 is blocking the nozzle 5, at least part of the ejector pin 14 extends out of the nozzle 5. The starting compressed air inlet 12 is connected to an external air source. By introducing external compressed air, the piston 13 can be pushed to move away from the nozzle 5, which in turn drives the ejector pin 14 away from the nozzle 5 outlet, allowing paint to be sprayed out from the nozzle 5 outlet. In the blocking state, the ejector pin 14 extends out of the nozzle 5, both blocking the nozzle 5 and removing paint from the nozzle 5 outlet, preventing paint accumulation and blockage at the nozzle 5 outlet. The use of the ejector pin 14 in conjunction with the nozzle 5 to control the opening and closing of the nozzle 5 is existing technology and will not be described further in this paper.

[0027] At least one first seal 27 is provided between the ejector pin 14 and the integrated connector 6 to isolate the piston chamber 11 and the inner tube 3. The first seal 27 can isolate the piston chamber 11 and the inner tube 3 to prevent the compressed gas and paint on both sides from affecting each other, and can also support and guide the ejector pin 14.

[0028] A second seal 28 is provided between the piston 13 and the cavity wall of the piston chamber 11. The second seal 28 is used to isolate the two sides of the piston chamber 11 relative to the piston 13, so as to ensure the pushing effect of the gas on the piston 13. The cross-sectional area of ​​the sealing end of the ejector pin 14 gradually decreases from the outside to the inside, so as to ensure that the front end of the ejector pin 14 can extend out of the nozzle 5, and the part after the front end can seal the nozzle 5.

[0029] In this embodiment, two first sealing elements 27 are provided, and the first sealing elements 27 are O-rings.

[0030] To ensure reliable movement of the piston 13, the integrated connector 6 is equipped with a reset compressed air inlet 16, which, along with the starting compressed air inlet 12, is located on both sides of the piston 13. The reset compressed air inlet 16 is connected to an external air source. By introducing external compressed air, the piston 13 is pushed towards the nozzle 5, which in turn causes the ejector pin 14 to block the nozzle 5's outlet, preventing paint from being sprayed out. The reset compressed air inlet 16 serves both as an air intake and as a starting compressed air inlet 12. During air intake, gas on the other side of the piston 13 can be discharged through the reset compressed air inlet 16, ensuring smooth movement of the piston 13.

[0031] To ensure reliable compressed gas ejection, the integrated connector 6 is equipped with a diffusion chamber 17 and an atomizing compressed air inlet 18 communicating with the diffusion chamber 17. The diffusion chamber 17 is connected to the outer pipe 2, and its cross-sectional area is larger than that of the outer pipe 2 cavity. The diffusion chamber 17 is enclosed by the outer wall of the inner pipe 3 and the integrated connector 6, but it is not connected to the inner pipe 3. The diffusion chamber 17 and the piston chamber 11 are located on opposite sides of the integrated connector 6. The design of the diffusion chamber 17 allows the compressed air entering from the atomizing compressed air inlet 18 to be uniformly and steadily pressurized within the diffusion chamber 17 before entering the cavity between the outer pipe 2 and the inner pipe 3, and finally being ejected from the nozzle 7, providing stable atomization and steering power for the sprayed paint.

[0032] To ensure reliable paint feeding, the integrated connector 6 is equipped with a paint inlet 19. The paint inlet 19 is only connected to the end of the inner tube 3 away from the nozzle 5. The paint is pumped inward by an external oil pump through the paint inlet 19. The paint entering from the paint inlet 19 moves in a straight line from one end of the inner tube 3 to the other end of the inner tube 3 without bending, reducing the risk of blockage.

[0033] The inner cavity of the inner tube 3 is separated from the diffusion chamber 17, meaning that the paint only enters the inner tube 3, and the compressed gas only enters the cavity between the outer tube 2 and the inner tube 3.

[0034] To ensure reliable paint spraying, the distance C between the nozzle 5 and the air nozzle 7 in the axial direction of the inner tube 3 is 1.5mm≤C≤5mm. If the axial distance between the air nozzle 7 and the nozzle 5 is too close, the compressed gas ejected by the air nozzle 7 will change the direction of the paint as soon as it exits the nozzle 5, causing the paint to easily accumulate at the exit edge of the nozzle 5. If the axial distance between the air nozzle 7 and the nozzle 5 is too far, the paint will have already diffused in the axial direction, weakening the effect of the air nozzle 7 in changing the direction of the paint, and some paint will diffuse and be wasted. Within the range of 1.5mm≤C≤5mm, the distance between the air nozzle 7 and the nozzle 5 is neither too close nor too far, ensuring that the compressed gas ejected by the air nozzle 7 has a good effect on changing the direction of the paint exiting the nozzle 5.

[0035] To ensure reliable paint spraying, the radial distance between the nozzle 5 and the air nozzle 7 in the inner tube 3 is D, where 3mm ≤ D ≤ 6mm. If the radial distance between the air nozzle 7 and the nozzle 5 is too close, paint will be sprayed onto the air nozzle 7. If the radial distance between the air nozzle 7 and the nozzle 5 is too far, the effect of the gas ejected from the air nozzle 7 on changing the direction of the paint will be reduced. Within the range of 3mm ≤ D ≤ 6mm, the distance between the air nozzle 7 and the nozzle 5 is neither too close nor too far, ensuring that the compressed gas ejected from the air nozzle 7 has a good effect on changing the direction of the paint coming out of the nozzle 5.

[0036] The air outlet of nozzle 7 is cylindrical; the diameter of the air outlet of nozzle 7 is 2mm.

[0037] To ensure reliable rotation of the outer tube 2, a first bearing 20 is fitted onto the outer tube 2, with its inner side fitting against the outer tube 2 and its outer side fitting against the inner wall of the housing 1. A second bearing 21 is also fitted onto the outer tube 2, with its inner side fitting against the outer tube 2 and its outer side fitting against the inner wall of the housing 1. The first bearing 20 and the second bearing 21 are arranged at intervals. A support spring 22 and a sealing gasket 23 are also fitted onto the outer tube 2. One end of the support spring 22 fits against the integrated joint 6, and the other end fits against one end of the sealing gasket 23. The other end of the sealing gasket 23 fits against the first bearing 20. The design of the first bearing 20 and the second bearing 21 allows for smoother rotation of the outer tube 2 and provides support to prevent it from shaking. The sealing gasket 23 blocks compressed air, preventing it from leaking out from the outside of the outer tube 2, and the support spring 22 presses the sealing gasket 23 to ensure a reliable seal.

[0038] like Figure 4 As shown, to ensure reliable driving of the outer tube 2, the driving component 4 is connected to the outer tube 2 via a transmission assembly 24. The transmission assembly 24 includes a first gear 25 and a second gear 26 that mesh with each other. The output shaft of the driving component 4 is connected to the first gear 25, and the outer tube 2 is connected to the second gear 26. In this embodiment, the driving component 4 is a rotary cylinder.

[0039] In this embodiment, the housing 1 includes a transmission housing 29 and a sleeve housing 30. One end of the sleeve housing 30 is connected to the transmission housing 29, and the other end is connected to the integrated connector 6. The transmission component 24 is located inside the transmission housing 29. The outer tube 2 and the inner tube 3 pass through the transmission housing 29 and the sleeve housing 30. The first bearing 20, the second bearing 21, the support spring 22, and the sealing gasket 23 are located inside the sleeve housing 30. The driving component 4 is arranged adjacent to the sleeve housing 30, and the sleeve housing 30 and the driving component 4 are connected by a fixing clip 31.

[0040] Example 2: This embodiment provides a rotary spray gun, which, in order to save air, such as Figure 5 As shown, in addition to the features described in Embodiment 1, the piston chamber 11 is provided with a reset spring 15. The reset spring 15 and the starting compressed air inlet 12 are located on both sides of the piston 13, respectively. The reset of the piston 13 is achieved by the reset spring 15, and the reset compressed air inlet 16 is only used for exhaust.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A rotary spray gun, characterized in that, The device includes a housing (1), an outer tube (2), an inner tube (3), and a drive unit (4). The outer tube (2) is rotatably mounted on the housing (1), and the inner tube (3) is mounted on the outer tube (2). One end of the inner tube (3) is provided with a nozzle (5), and the other end is provided with an integrated connector (6) for controlling the opening and closing of the rotary spray gun and for air and material feeding. The outer tube (2) is provided with an air nozzle (7) for changing the direction of paint movement. The drive unit (4) is used to drive the air nozzle (7) to rotate around the nozzle (5). The air outlet direction of the air nozzle (7) is towards the center line of the nozzle (5), and the angle between the air nozzle (7) and the spray direction of the nozzle (5) is A, 45°≤A≤150°. The inner tube (3) and the nozzle (5) are on the same straight line.

2. A rotary spray gun according to claim 1, characterized in that, One end of the outer tube (2) is located inside the shell (1), and the other end extends out of the shell (1); the end of the outer tube (2) away from the shell (1) is provided with an end cap (8), and the air nozzle (7) is provided on the end cap (8), and the end cap (8) is provided with a through hole (9) for accommodating the nozzle (5).

3. A rotary spray gun according to claim 2, characterized in that, At least part of the nozzle (5) extends out of the end cap (8) through the through hole (9); the gap between the nozzle (5) and the through hole (9) forms an air outlet channel (10), and the air outlet direction of the air outlet channel (10) is the same as the extension direction of the inner tube (3) from the integrated joint (6) to the nozzle (5); the inner diameter surface and the outer diameter surface at the end of the air outlet channel (10) are arranged in parallel; the gap between the nozzle (5) and the through hole (9) is B, 0.1mm≤B≤0.5mm.

4. A rotary spray gun according to claim 1, characterized in that, The integrated connector (6) is provided with a piston chamber (11) and a starting compressed air inlet (12) connected to the piston chamber (11). The piston chamber (11) is provided with a slidable piston (13). The piston (13) is provided with a pin (14). One end of the pin (14) is fixedly connected to the piston (13), and the other end is inserted into the inner tube (3). When the pin (14) blocks the nozzle (5), at least part of the pin (14) extends out of the nozzle (5).

5. A rotary spray gun according to claim 4, characterized in that, The piston chamber (11) is provided with a reset spring (15) or the integrated connector (6) is provided with a reset compressed air inlet (16). The reset spring (15) or reset compressed air inlet (16) and the start compressed air inlet (12) are located on both sides of the piston (13).

6. A rotary spray gun according to claim 4, characterized in that, At least one first seal (27) is provided between the ejector pin (14) and the integrated connector (6) for isolating the piston chamber (11) and the inner tube (3), and a second seal (28) is provided between the piston (13) and the cavity wall of the piston chamber (11); the cross-sectional area of ​​the sealing end of the ejector pin (14) gradually decreases from the outside to the inside.

7. A rotary spray gun according to claim 1, characterized in that, The integrated connector (6) is provided with a diffusion chamber (17) and an atomized compressed air inlet (18) connected to the diffusion chamber (17). The diffusion chamber (17) is connected to the outer tube (2). The cross-sectional area of ​​the diffusion chamber (17) is larger than the cross-sectional area of ​​the outer tube (2) cavity. The integrated connector (6) is provided with a paint inlet (19), which is connected to the inner tube (3).

8. A rotary spray gun according to claim 1, characterized in that, The distance between the nozzle (5) and the air nozzle (7) in the axial direction of the inner tube (3) is C, 1.5mm≤C≤5mm; the distance between the nozzle (5) and the air nozzle (7) in the radial direction of the inner tube (3) is D, 3mm≤D≤6mm.

9. A rotary spray gun according to claim 1, characterized in that, The outer tube (2) is fitted with a first bearing (20), the inner side of the first bearing (20) is in contact with the outer tube (2), and the outer side of the first bearing (20) is in contact with the inner wall of the shell (1); the outer tube (2) is fitted with a second bearing (21), the inner side of the second bearing (21) is in contact with the outer tube (2), and the outer side of the second bearing (21) is in contact with the inner wall of the shell (1); the first bearing (20) and the second bearing (21) are arranged at intervals.

10. A rotary spray gun according to claim 9, characterized in that, The outer tube (2) is also fitted with a support spring (22) and a sealing gasket (23). One end of the support spring (22) is attached to the integrated joint (6), and the other end is attached to one end of the sealing gasket (23). The other end of the sealing gasket (23) is attached to the first bearing (20). The drive component (4) is connected to the outer tube (2) through the transmission assembly (24).

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