A device for coating the inner wall of an aluminum hose

Abstract

The application provides an aluminum hose inner wall coating device, which comprises a spray gun assembly, a powder supply seat and a powder supply device, the spray gun assembly comprises a busbar, a cover and a plurality of spraying heads, the spraying head comprises a seat, two discharge rods, a plurality of discharge heads, a connecting seat and a spraying pipe, the interiors of the two spraying pipes are respectively provided with a plurality of third spraying slots, and the interior of the end of the spraying pipe away from the seat is provided with a first spraying slot and two second spraying slots; the technical key points are as follows: the powder supply device is used for conveying epoxy modified phenolic resin powder into the powder supply seat, when the epoxy modified phenolic resin powder enters between the busbar and the cover through the powder supply elbow and is branched into the interiors of the plurality of spraying heads, the negative electrode of the high-voltage electrostatic generator is connected with the conductive ring through the negative electrode lead wire, the plurality of spraying heads can simultaneously have the ability of spraying the epoxy modified phenolic resin powder and the ability of generating negative ions by means of corona discharge breakdown of partial air, and the spraying work on a large number of aluminum pipes can be efficiently carried out.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, specifically to a coating device for the inner wall of an aluminum flexible tube. Background Technology

[0002] Aluminum tubing, as a high-performance packaging material, is widely used in ointments, cosmetics, and other liquid or paste products requiring sealed protection. Aluminum tubing offers advantages such as rust resistance, non-toxicity, excellent light-blocking properties, and strong gas and moisture barrier properties. It also boasts good processing performance and no resilience, effectively protecting the stability and efficacy of its contents.

[0003] During the production of aluminum flexible hoses, an internal spraying process is often used to coat the inner wall of the hose with epoxy phenolic resin to isolate it from acids, alkalis, moisture, and solvents, preventing the filler from reacting with the aluminum material. When spraying epoxy-modified phenolic resin powder, the spray gun is connected to the negative terminal, and the metal workpiece is reliably grounded (zero potential positive terminal). During the spraying process, corona discharge at the nozzle tip breaks down local air to generate negative ions. The epoxy-modified phenolic resin powder, after passing through the ionization zone, becomes negatively charged and, propelled by the electric field and compressed air, flies towards the workpiece, where it adheres to the inner surface of the hose by Coulomb force.

[0004] Existing spraying equipment, by inserting the nozzle into the interior of an aluminum hose and working with a highly efficient automated production line, can ensure that epoxy-modified phenolic resin powder is evenly adhered to the inner wall of the aluminum hose during the spraying process, thus guaranteeing spraying efficiency. However, in actual applications, since the spray gun nozzle can only act on the interior of one aluminum hose at a time, it takes a long time to process a large number of aluminum hoses, resulting in low overall efficiency.

[0005] An epoxy powder coating device (publication number CN214975429U) starts a motor B, causing the screw to rotate under force. The movable sleeve on the surface of the screw is threadedly connected to the screw, so it moves horizontally to one side. At the same time, the motor A and the spray gun are turned on. The motor A drives the steel pipe to rotate through the rotating wheel. Therefore, the horizontally moving movable sleeve drives the spray gun to spray epoxy powder onto the inner wall of the rotating steel pipe, so that the inner wall of the steel pipe is evenly sprayed. However, it also reflects the above-mentioned problems to a certain extent. Summary of the Invention

[0006] To overcome the shortcomings of existing spraying devices, which, through inserting the nozzle into the interior of an aluminum hose and utilizing a highly efficient automated production line, can uniformly adhere epoxy-modified phenolic resin powder to the inner wall of the aluminum hose during the spraying process, ensuring spraying efficiency, but in practical applications, because the spray gun nozzle can only act on the interior of one aluminum hose at a time, it is time-consuming and has low overall efficiency when processing large quantities of aluminum hoses, this application provides an aluminum hose inner wall coating device. This device uses a powder supply device to deliver epoxy-modified phenolic resin powder into the powder supply seat, which then enters the manifold and capping plate via the powder supply bend. When the powder is distributed between multiple spray heads, the negative electrode of the high-voltage electrostatic generator is connected to the conductive ring by a negative electrode wire. This allows multiple spray heads to simultaneously spray epoxy-modified phenolic resin powder and generate negative ions by corona discharge breaking down local air. Ultimately, the epoxy-modified phenolic resin powder becomes negatively charged after passing through the ionization zone and, with the assistance of electric field force and compressed air, adsorbs onto the inner wall of the aluminum pipe. This completes the synchronous spraying of epoxy-modified phenolic resin powder inside multiple aluminum pipes, facilitating efficient spraying of large batches of aluminum pipes.

[0007] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0008] An aluminum hose inner wall coating device includes a spray gun assembly, a powder supply seat, and a powder supply device, wherein the powder supply seat is disposed at the bottom of one side of the spray gun assembly;

[0009] The powder supply device is located at the bottom of the powder supply base;

[0010] A device support is provided on the outside of the powder supply device. The powder supply seat is assembled to the top of the device support. The spray gun assembly includes a manifold. A cover is provided on the side of the manifold away from the spray gun assembly. A powder supply bend is machined on the top of the powder supply seat. The powder supply bend is at a 90-degree angle and a fixed back frame is assembled to one end of it.

[0011] Multiple spray nozzles are provided on the side of the cover away from the manifold, and one end of each spray nozzle passes through the inside of the cover and is in communication with the inside of the manifold.

[0012] One end of the powder supply bend extends into the inside of the manifold at the center of the manifold. The interior of the multiple spray heads near the end of the cover is connected to the interior of the manifold. The spray heads are rotatably connected to one side of the cover. Multiple aluminum fittings are simultaneously sleeved onto the outside of the multiple spray heads.

[0013] In one possible implementation, multiple diverter frames are machined on one inner wall of the manifold, and each of the multiple diverter frames has a second vent slot inside. A positioning tube head is integrally formed at the end of the diverter frame away from the manifold. One end of the spray head is inserted into the interior of the positioning tube head and the diverter frame. The cover is sleeved onto the exterior of the multiple positioning tube heads, and a gasket is used to seal the manifold and the fixed back frame. The fixed back frame, manifold, and cover are assembled and fixed by bolts.

[0014] In one possible implementation, the spray head includes a base plate with a connecting collar integrally formed on the side of the base plate facing the cover, and a bearing is interference-fitted inside the connecting collar; one end of the positioning tube extends from inside the cover, and the bearing is interference-fitted to the outside of the positioning tube at the end away from the distributor frame.

[0015] In one possible implementation, a conductive ring is embedded inside the side of the fixed back frame facing the manifold, and multiple conductive crossbars are machined on the surface of the conductive ring facing the manifold. A negative electrode wire is welded to the side of the conductive ring facing the fixed back frame, and the multiple conductive crossbars are respectively pinned to the interior of multiple diverter cylinder frames.

[0016] In one possible implementation, two discharge rods are provided on the surface of the base plate away from the cover, and multiple discharge heads are machined on the surface of the two discharge rods facing away from each other. A connecting post is machined at the center of the side of the base plate facing the cover, and a first venting slot is opened inside the connecting post. The multiple discharge heads are arranged at equal intervals and in a straight line, and the two discharge rods are arranged symmetrically above and below each other. The interior of the first venting slot is connected to the interior of the second venting slot.

[0017] In one possible implementation, the conductive crossbar has a ball groove inside the end facing the connecting post, and the connecting post has a ball head machined on the surface of the end facing the conductive crossbar. The conductive crossbar is fastened to the outside of the ball head through the ball groove, and the connecting post rotates relative to the conductive crossbar.

[0018] In one possible implementation, a connecting seat is integrally formed on the surface of the base away from the cover, and spray tubes are machined at both ends of the connecting seat; the two spray tubes are arranged left and right, and the plane of the two spray tubes is perpendicular to the plane of the two discharge rods.

[0019] In one possible implementation, both spray tubes have multiple equally spaced third spray slots inside. The end of each spray tube away from the base plate has a first spray slot and two second spray slots inside. The connecting head, base plate, connecting seat, and both spray tubes share a common flow divider. The interior of the first vent is connected to the interior of the flow divider. The interiors of the third spray slot, the first spray slot, and the second spray slot are all connected to the interior of the flow divider.

[0020] In one possible implementation, a plurality of third spraying slots on the two spraying pipes are arranged in a straight line and are symmetrical about the origin. The plurality of third spraying slots are all inclined and face the inner wall of the aluminum pipe body.

[0021] In one possible implementation, two second spraying slots are symmetrically arranged on both sides of the first spraying slot, and both second spraying slots are inclined. The first spraying slot and the two second spraying slots all face the inner wall of the aluminum pipe head.

[0022] The beneficial effects of this application are as follows:

[0023] Firstly, in this solution, epoxy-modified phenolic resin powder is fed into the powder supply seat using a powder supply device. As the powder enters between the manifold and the cap through the powder supply bend and is distributed to the interior of multiple spray heads, the negative electrode of the high-voltage electrostatic generator is connected to the conductive ring by a negative electrode wire. This allows multiple spray heads to simultaneously spray epoxy-modified phenolic resin powder and generate negative ions by corona discharge breaking down local air. Ultimately, the epoxy-modified phenolic resin powder becomes negatively charged after passing through the ionization zone and, with the assistance of electric field force and compressed air, is adsorbed onto the inner wall of the aluminum pipe fittings. This completes the synchronous spraying of epoxy-modified phenolic resin powder inside multiple aluminum pipe fittings, facilitating efficient spraying of large batches of aluminum pipe fittings.

[0024] Secondly, in this solution, the dust enters between the manifold and the cover through the powder supply bend, and then enters the first vent on the connecting column head from the second vent on the multiple distribution cylinder frame. Thus, the dust is diverted to the interior of the two spray pipes through the distribution slots and sprayed out from the interior of the multiple third spray slots. With the multiple third spray slots symmetrically and inclined about the origin facing the inner wall of the aluminum pipe, and the first and second spray slots sweeping across the inner wall of the aluminum pipe head, the two spray pipes can be made to rotate around the positioning tube head by means of the reverse force. This makes it easier to keep the spray head in a rotating spraying state. The two discharge rods rotate with the base plate and provide an electric field for the epoxy modified phenolic resin powder to fly at the tip of the discharge head away from the discharge rod. There is no need to change the spraying angle of the multiple spray heads inside the multiple aluminum pipes.

[0025] Thirdly, in this solution, by supporting the bearing between the connecting collar and the positioning tube head, while keeping the spray head rotating relative to the cap and manifold, the ball head is fastened to the outside of the ball head by means of the conductive crossbar through the ball groove, preventing the ball head from coming out of the inside of the conductive crossbar. Without affecting the relative rotation of the conductive crossbar and the connecting column head, the distributor tube frame and the conductive crossbar are kept in contact, so that multiple spray heads are simultaneously connected to the negative terminal of the high-voltage electrostatic generator. This helps to ensure that the entire spray gun assembly is connected to the negative terminal and cooperates with multiple grounded aluminum pipes to complete the spraying of epoxy modified phenolic resin powder. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an aluminum hose inner wall coating device according to the present invention;

[0027] Figure 2 This is a schematic diagram of the spray gun assembly of an aluminum hose inner wall coating device according to the present invention.

[0028] Figure 3 This is a schematic diagram showing the installation position of the spray head of the aluminum hose inner wall coating device according to the present invention.

[0029] Figure 4 This is a cross-sectional view of the fixing frame of the aluminum hose inner wall coating device of the present invention;

[0030] Figure 5 This is a schematic diagram of the planar structure of the spray gun assembly of an aluminum hose inner wall coating device according to the present invention.

[0031] Figure 6 This is a schematic diagram of the spray head of an aluminum hose inner wall coating device according to the present invention;

[0032] Figure 7 This is one of the planar structural schematic diagrams of the spray head of the aluminum hose inner wall coating device of the present invention;

[0033] Figure 8 This is a second schematic diagram of the planar structure of the spray head of the aluminum hose inner wall coating device of the present invention.

[0034] Figure label:

[0035] 1. Device support frame; 2. Powder supply device; 3. Powder supply base;

[0036] 4. Spray gun assembly; 401. Cover; 402. Spray head; 4021. Base plate; 4022. Connecting seat; 4023. Discharge rod; 4024. Spray tube; 4025. Ball head; 4026. Connecting post head; 4027. Connecting collar; 4028. Discharge head; 403. Manifold; 404. Fixed back frame; 405. Diverter frame; 406. Positioning tube head;

[0037] 5. Aluminum pipe fittings; 6. Powder supply bend; 7. Negative electrode wire; 8. Conductive ring; 9. Conductive crossbar; 10. First vent slot; 11. Second vent slot; 12. Bearing; 13. First spraying slot; 14. Second spraying slot; 15. Third spraying slot; 16. Ball groove; 17. Diverter slot. Detailed Implementation

[0038] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0039] Example 1:

[0040] This embodiment describes the specific structure of an aluminum flexible tube inner wall coating device, which can be referred to in detail below. Figures 1 to 6 As shown, the spray gun assembly includes a spray gun assembly 4, a powder supply base 3 located at the bottom of one side of the spray gun assembly 4, and a powder supply device 2 located at the bottom of the powder supply base 3. A device support 1 is provided on the outside of the powder supply device 2. The powder supply base 3 is assembled to the top of the device support 1. The spray gun assembly 4 includes a manifold 403. A cover 401 is provided on the side of the manifold 403 away from the spray gun assembly 4. A powder supply bend 6 is machined on the top of the powder supply base 3. The powder supply bend 6 is at a 90-degree angle, and a fixed back frame 404 is assembled and connected to one end of it. Multiple diverter frames 405 are machined on the inner wall of one side of the manifold 403. A second vent slot 11 is opened inside the multiple diverter frames 405. A positioning tube head 406 is integrally formed on the end of the diverter frame 405 away from the manifold 403.

[0041] Multiple spray heads 402 are provided on the side of the cover 401 away from the manifold 403, and one end of each spray head 402 passes through the interior of the cover 401 and is in communication with the interior of the manifold 403.

[0042] One end of the powder supply bend 6 extends into the interior of the manifold 403 at the center of the manifold 403. The interior of the multiple spray heads 402 near the end of the cover 401 is connected to the interior of the manifold 403. The spray heads 402 are rotatably connected to one side of the cover 401. When multiple aluminum pipes 5 are simultaneously fitted onto the outside of multiple spray heads 402, epoxy modified phenolic resin powder can be delivered into the powder supply seat 3 by means of the powder supply device 2, and delivered into the multiple spray heads 402 on the spray gun assembly 4 respectively, and finally sprayed onto the inner wall of multiple aluminum pipes 5.

[0043] Secondly, by inserting one end of the spray head 402 into the interior of the positioning tube head 406 and the diverter frame 405, and by fitting the cover 401 onto the outside of the multiple positioning tube heads 406, a gasket can be used between the manifold 403 and the fixed back frame 404. After the fixed back frame 404, the manifold 403 and the cover 401 are assembled and fixed with bolts, the cover 401 and the manifold 403 can be sealed.

[0044] It is worth noting that the gaskets are applied between the edges of the cover 401 and the manifold 403, and between the distributor frame 405 and the cover 401.

[0045] Furthermore, to ensure that multiple spray heads 402 can cooperate with multiple grounded aluminum pipes 5 to achieve a discharge state and generate negative ions in the local air, such as... Figure 4 and Figure 5 As shown, a conductive ring 8 is embedded inside the fixed back frame 404 facing the junction plate 403. Multiple conductive crossbars 9 are machined on the surface of the conductive ring 8 facing the junction plate 403. A negative electrode wire 7 is welded to the side of the conductive ring 8 facing the fixed back frame 404. By pinning the multiple conductive crossbars 9 to the inside of multiple distribution cylinder frames 405, and after connecting the connecting post 4026 and the conductive crossbars 9, the negative electrode wire 7 connected to the high voltage electrostatic generator can connect the multiple spray heads 402. This ensures that when the multiple spray heads 402 spray epoxy modified phenolic resin powder, they can generate negative ions by breaking down the local air through corona discharge. After passing through the ionization zone, the epoxy modified phenolic resin powder becomes negatively charged and, under the push of the electric field force and compressed air, flies towards the inner wall of the aluminum pipe 5, finally completing the adsorption.

[0046] In this embodiment, a chamber for supplying epoxy-modified phenolic resin powder to multiple spray heads 402 is formed by the combination of the manifold 403 and the cover 401. When the powder supply device 2 delivers epoxy-modified phenolic resin powder to the powder supply seat 3, the dust is diverted to the interior of the multiple spray heads 402. At the same time, based on the negative electrode of the high-voltage electrostatic generator being connected to the conductive ring 8 by the negative electrode wire 7, and after the multiple conductive crossbars 9 on the conductive ring 8 are respectively connected to the connecting post heads 4026 on the multiple spray heads 402, the multiple spray heads 402 can maintain the ability to spray epoxy-modified phenolic resin powder at the same time, and also have the ability to generate negative ions by corona discharge breaking down the local air. Finally, the epoxy-modified phenolic resin powder is negatively charged after passing through the ionization zone, and adsorbed on the inner wall of the aluminum pipe 5 with the assistance of electric field force and compressed air.

[0047] Example 2:

[0048] Based on Example 1, this example describes the specific structure of the spray head 402, such as... Figures 2 to 8As shown, the spray head 402 includes a base plate 4021, and a connecting collar 4027 is integrally formed on the side of the base plate 4021 facing the cover 401. The connecting collar 4027 has a bearing 12 that is interference-fitted inside.

[0049] A connecting seat 4022 is integrally formed on the surface of the seat plate 4021 away from the cover 401. Both ends of the connecting seat 4022 are machined with spray tubes 4024. The two spray tubes 4024 are arranged left and right. The interior of each of the two spray tubes 4024 is provided with multiple equally spaced third spray slots 15. The interior of the end of the spray tube 4024 away from the seat plate 4021 is provided with a first spray slot 13 and two second spray slots 14. The interior of the connecting column head 4026, the seat plate 4021, the connecting seat 4022 and the two spray tubes 4024 are all provided with a diversion slot 17.

[0050] Two discharge rods 4023 are provided on the side surface of the base plate 4021 away from the cover 401. Multiple discharge heads 4028 are machined on the side surface of the two discharge rods 4023 facing away from each other. A connecting column head 4026 is machined at the center of the side of the base plate 4021 facing the cover 401. A first venting slot 10 is opened inside the connecting column head 4026. Multiple diverter cylinders 405 are machined on the inner wall of one side of the manifold 403. A second venting slot 11 is opened inside the multiple diverter cylinders 405.

[0051] In this way, by connecting the interior of the first ventilation slot 10 with the interior of the second ventilation slot 11, when the powder supply device 2 supplies epoxy modified phenolic resin powder to the powder supply seat 3, the dust can enter between the manifold 403 and the cover 401 through the powder supply bend 6, and enter the interior of the first ventilation slot 10 on the connecting column head 4026 from the interior of the second ventilation slot 11 on the multiple diverter cylinder frame 405, thereby diverting it to the interior of the multiple spray heads 402.

[0052] Secondly, by connecting the interior of the first ventilation slot 10 with the interior of the diversion slot 17, and connecting the interiors of the third spray slot 15, the first spray slot 13, and the second spray slot 14 with the interior of the diversion slot 17, when dust enters between the manifold 403 and the cover 401 through the powder supply bend 6, and enters the interior of the first ventilation slot 10 on the connecting column head 4026 from the interior of the second ventilation slot 11 on the multiple diversion cylinder frame 405, the dust is diverted from the diversion slot 17 to the interior of the two spray pipes 4024, and is sprayed out from the interiors of the multiple third spray slots 15, the first spray slot 13, and the two second spray slots 14;

[0053] During this process, because the multiple third spraying slots 15 on the two spraying pipes 4024 are arranged in a line and symmetrical about the origin, and the multiple third spraying slots 15 are all inclined and face the inner wall of the aluminum pipe body 5, the epoxy modified phenolic resin powder sprayed from the multiple third spraying slots 15 causes the two spraying pipes 4024 to tend to drive the seat plate 4021 to rotate around its center.

[0054] One end of the positioning tube head 406 extends from the inside of the cover 401, so that the bearing 12 is interference-fitted to the outside of the positioning tube head 406 away from the end of the distributor tube frame 405. The two spray tubes 4024 tend to drive the seat plate 4021 to rotate around its center. The bearing 12 connects the positioning tube head 406 and the connecting collar 4027, so that the spray head 402 is in a rotating spraying state.

[0055] Furthermore, in order to enable the spray head 402 to rotate and spray epoxy-modified phenolic resin powder, corona discharge is used to break down the surrounding air and generate negative ions, such as... Figure 5 , Figure 6 and Figure 8 As shown, multiple discharge heads 4028 are arranged at equal intervals and in a straight line, two discharge rods 4023 are arranged symmetrically above and below, and the planes of the two spray tubes 4024 are perpendicular to the planes of the two discharge rods 4023. When the epoxy-modified phenolic resin powder sprayed from multiple third spray slots 15 causes the two spray tubes 4024 to tend to drive the base plate 4021 to rotate around its center, the base plate 4021 drives the two discharge rods 4023 to rotate synchronously. Finally, in the state of rotating spraying, an electric field is provided for the epoxy-modified phenolic resin powder to fly dust.

[0056] Meanwhile, the phenomenon of corona discharge breaking down air is likely to occur at the tips of multiple discharge heads 4028 that are far from the discharge rod 4023, which helps to form an electric field for electron separation.

[0057] Furthermore, in order to ensure that the spray head 402 in the rotary spraying state can cover both the inner wall of the aluminum pipe body and the inner wall of the pipe head of the aluminum pipe 5, such as... Figure 7 and Figure 8 As shown, two second spray nozzles 14 are symmetrically arranged on both sides of the first spray nozzle 13. Both second spray nozzles 14 are inclined. By making the first spray nozzle 13 and the two second spray nozzles 14 face the inner wall of the aluminum pipe head, the first spray nozzle 13 and the second spray nozzle 14 can sweep across the inner wall of the aluminum pipe head and fully cover the inner wall of the aluminum pipe 5 when the epoxy modified phenolic resin powder sprayed from multiple third spray nozzles 15 causes the two spray tubes 4024 to rotate around its center. This is achieved without adjusting the spraying angle of multiple spray heads 402.

[0058] In some examples, the conductive crossbar 9 has a ball groove 16 inside the end facing the connecting post 4026, and a ball head 4025 is machined on the surface of the end of the connecting post 4026 facing the conductive crossbar 9.

[0059] Specifically, by engaging the conductive crossbar 9 with the ball groove 16 to the outside of the ball head 4025, the connecting post head 4026 and the conductive crossbar 9 are kept in a state of relative rotation. Under the premise that the bearing 12 is supported between the connecting collar 4027 and the positioning tube head 406, the ball head 4025 is prevented from exiting from the inside of the conductive crossbar 9, and the flow divider frame 405 and the conductive crossbar 9 are connected, so that multiple spray heads 402 are simultaneously connected to the negative terminal of the high voltage electrostatic generator.

[0060] In this embodiment, dust enters between the manifold 403 and the cover 401 through the powder supply bend 6, enters the first ventilation slot 10 on the connecting column head 4026 from the second ventilation slot 11 on the multiple diverter cylinders 405, and is finally diverted to the interior of the two spray pipes 4024 by the diverter slot 17. When the dust is sprayed out from the interior of the multiple third spray slots 15, the first spray slot 13 and the two second spray slots 14, the multiple third spray slots 15 are arranged in a line and symmetrical about the origin. The tilted orientation of the multiple third spray slots 15 allows the two spray pipes 4024 to tend to drive the seat plate 4021 to rotate around the positioning tube head 406 during the dust spraying process. This makes it easier to keep the spray head 402 in a rotating spraying state, while the dust acts on the inner wall of the aluminum tube 5.

[0061] At the same time, the first spraying slot 13 and the second spraying slot 14 sweep across the inner wall of the aluminum pipe 5, which is conducive to fully covering the inner wall of the aluminum pipe 5, without the need to adjust the spraying angle of multiple spraying heads 402.

[0062] During the process of the spray head 402 rotating and spraying, since the two discharge rods 4023 are processed together with the base plate 4021, the two discharge rods 4023 can rotate with the base plate 4021, and the tip of the discharge head 4028 away from the discharge rods 4023 provides an electric field for the epoxy modified phenolic resin powder to fly.

[0063] In addition, the bearing 12 is supported between the connecting collar 4027 and the positioning tube head 406, keeping the spray head 402 rotating relative to the cover 401 and the manifold 403. It is connected to the outside of the ball head 4025 by means of the conductive crossbar 9 and the ball groove 16 to prevent the ball head 4025 from coming out of the inside of the conductive crossbar 9. Without affecting the relative rotation of the conductive crossbar 9 and the connecting column head 4026, the distributor tube frame 405 and the conductive crossbar 9 are kept in contact, so that multiple spray heads 402 are simultaneously connected to the negative terminal of the high voltage electrostatic generator. This helps to ensure that the entire spray gun assembly 4 is connected to the negative terminal and cooperates with multiple grounded aluminum pipes 5 to complete the spraying of epoxy modified phenolic resin powder.

[0064] Specifically, when using this device to perform operations:

[0065] First, multiple aluminum pipe fittings 5 ​​are supported by tooling and kept facing multiple spray nozzles 402, and are respectively fitted onto the outside of the multiple spray nozzles 402;

[0066] Meanwhile, the negative electrode on the high voltage electrostatic generator is connected to the conductive ring 8 by the negative electrode wire 7, and the multiple conductive crossbars 9 on the conductive ring 8 are connected to the connecting post head 4026 through the ball head 4025, forming an electric field to assist the movement of particles on the spraying path of the epoxy modified phenolic resin powder.

[0067] Then, the powder supply device 2 delivers epoxy modified phenolic resin powder into the powder supply seat 3, so that the dust enters between the manifold 403 and the cover 401 through the powder supply bend 6, and enters the first venting slot 10 on the connecting column head 4026 from the inside of the second venting slot 11 on the multiple diverting cylinder frame 405, thereby diverting it to the inside of the multiple spray heads 402.

[0068] Next, the dust enters from the second vent 11 on the multiple diverter cylinders 405 into the first vent 10 on the connecting column head 4026, and is then diverted by the diverter 17 to the interior of the two spray pipes 4024, and is sprayed out from the interior of the multiple third spray vents 15, the first spray vent 13 and the two second spray vents 14.

[0069] During the process of dust being sprayed out from multiple third spraying slots 15, the two spraying pipes 4024 tend to drive the base plate 4021 to rotate around the positioning pipe head 406 by means of the reverse force, keeping the spraying head 402 in a rotating spraying state, so that the dust acts on the inner wall of the aluminum pipe 5.

[0070] When dust is ejected from the inside of the first spray nozzle 13 and the two second spray nozzles 14, the first spray nozzle 13 and the second spray nozzles 14 sweep across the inner wall of the tube head of the aluminum tube 5.

[0071] Subsequently, the sprayed epoxy-modified phenolic resin powder adheres to the inner wall of the aluminum pipe 5 under the assistance of an electric field.

[0072] It is worth noting that after the phenolic modified epoxy powder coating is applied, a curing temperature of 170-200℃ is used and the temperature is maintained for 15-30 minutes. Finally, the product is removed from the oven and allowed to cool naturally. The cross-linked thermosetting network structure is then shaped and hardened, ultimately forming a hard, dense, and water-resistant long-lasting anti-corrosion / insulation protective layer.

[0073] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A device for coating the inner wall of an aluminum flexible tube, characterized in that, include: Spray gun assembly (4); Powder supply seat (3), which is located at the bottom of one side of the spray gun assembly (4); The powder supply device (2) is located at the bottom of the powder supply base (3); The powder supply device (2) is provided with a device support (1) on its outer side. The powder supply seat (3) is assembled to the top of the device support (1). The spray gun assembly (4) includes a manifold (403). A cover (401) is provided on the side of the manifold (403) away from the spray gun assembly (4). A powder supply bend (6) is machined on the top of the powder supply seat (3). The powder supply bend (6) is at a 90-degree angle and a fixed back frame (404) is assembled to one end of it. Multiple spray nozzles (402) are provided on the side of the cover (401) away from the manifold (403), and one end of each spray nozzle (402) passes through the interior of the cover (401) and is in communication with the interior of the manifold (403). One end of the powder supply bend (6) extends into the interior of the manifold (403) at the center of the manifold (403). The interior of the multiple spray heads (402) near the end of the cover (401) is connected to the interior of the manifold (403). The spray head (402) is rotatably connected to one side of the cover (401). Multiple aluminum pipe fittings (5) are simultaneously sleeved onto the outside of the multiple spray heads (402).

2. The aluminum hose inner wall coating device as described in claim 1, characterized in that: Multiple diverter frames (405) are machined on one side of the inner wall of the manifold (403). Each of the multiple diverter frames (405) has a second vent slot (11) inside. A positioning tube head (406) is integrally formed at the end of the diverter frame (405) away from the manifold (403). One end of the spray head (402) is inserted into the interior of the positioning tube head (406) and the diverter frame (405). The cover (401) is sleeved onto the outside of the multiple positioning tube heads (406). A gasket is used to seal the manifold (403) and the fixed back frame (404). The fixed back frame (404), the manifold (403) and the cover (401) are assembled and fixed by bolts.

3. The aluminum hose inner wall coating device as described in claim 2, characterized in that: The spray head (402) includes a base plate (4021), and a connecting collar (4027) is integrally formed on the side of the base plate (4021) facing the cover (401). The connecting collar (4027) has an interference fit bearing (12) inside. One end of the positioning tube head (406) extends from the inside of the cover (401), and the bearing (12) is interference-fitted to the outside of the positioning tube head (406) away from the end of the diverter frame (405).

4. The aluminum hose inner wall coating device as described in claim 3, characterized in that: A conductive ring (8) is embedded in the side of the fixed back frame (404) facing the junction box (403). Multiple conductive crossbars (9) are machined on the surface of the conductive ring (8) facing the junction box (403). A negative electrode wire (7) is welded to the side of the conductive ring (8) facing the fixed back frame (404). The multiple conductive crossbars (9) are respectively pinned to the interior of multiple diverter frames (405).

5. The aluminum hose inner wall coating device as described in claim 4, characterized in that: Two discharge rods (4023) are provided on the side surface of the base plate (4021) away from the cover (401). Multiple discharge heads (4028) are processed on the side surface of the two discharge rods (4023) facing away from each other. A connecting post (4026) is processed at the center of the side of the base plate (4021) facing the cover (401). A first ventilation slot (10) is opened inside the connecting post (4026). Among them, multiple discharge heads (4028) are arranged at equal intervals and in a straight line, and two discharge rods (4023) are arranged symmetrically above and below. The interior of the first ventilation slot (10) is connected to the interior of the second ventilation slot (11).

6. The aluminum hose inner wall coating device as described in claim 5, characterized in that: The conductive crossbar (9) has a ball groove (16) inside the end facing the connecting post (4026), and a ball head (4025) is machined on the surface of the end of the connecting post (4026) facing the conductive crossbar (9). The conductive crossbar (9) is fastened to the outside of the ball head (4025) through the ball groove (16), and the connecting post (4026) and the conductive crossbar (9) rotate relative to each other.

7. The aluminum hose inner wall coating device as described in claim 5, characterized in that: The base plate (4021) has a connecting seat (4022) integrally formed on the side surface away from the cover (401), and both ends of the connecting seat (4022) are processed with spray tubes (4024). The two spray tubes (4024) are arranged on the left and right sides, and the plane of the two spray tubes (4024) is perpendicular to the plane of the two discharge rods (4023).

8. The aluminum hose inner wall coating device as described in claim 7, characterized in that: The interior of each of the two spray pipes (4024) is provided with a plurality of equally spaced third spray slots (15). The end of the spray pipe (4024) away from the base plate (4021) is provided with a first spray slot (13) and two second spray slots (14). The interior of the connecting column head (4026), the base plate (4021), the connecting seat (4022) and the two spray pipes (4024) are provided with a diversion slot (17). The interior of the first ventilation slot (10) is connected to the interior of the diversion slot (17), and the interiors of the third spraying slot (15), the first spraying slot (13), and the second spraying slot (14) are all connected to the interior of the diversion slot (17).

9. The aluminum hose inner wall coating device as described in claim 8, characterized in that: Multiple third spraying slots (15) on the two spraying pipes (4024) are arranged in a line and symmetrical about the origin. The multiple third spraying slots (15) are all inclined and face the inner wall of the aluminum pipe (5).

10. The aluminum hose inner wall coating device as described in claim 8, characterized in that: Two second spraying slots (14) are symmetrically arranged on both sides of the first spraying slot (13). Both second spraying slots (14) are inclined. The first spraying slot (13) and the two second spraying slots (14) face the inner wall of the aluminum pipe head (5).

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