Salt sculpture nano-composite damp-proof coating spraying device and method

Abstract

The invention relates to the technical field of coating spraying equipment, and discloses a salt sculpture nano-composite damp-proof coating spraying device and method.The salt sculpture nano-composite damp-proof coating spraying device comprises an electrical box, a coating box for storing spraying coating is arranged at the top of the electrical box, and a treatment box is arranged on one side of the coating box; one side of the treatment box is connected with the corresponding positions of the outer walls of the electrical box and the coating box; a closed cover is arranged on the upper portion of the treatment box, and the four corners of the bottom end of the closed cover are connected with the corresponding corners of the treatment box and the coating box correspondingly. By adding and arranging the ultrasonic auxiliary mechanism, in the process of spraying paint on the surface of the salt sculpture, the ultrasonic auxiliary mechanism can generate vibration through the ultrasonic generator, and the vibration is transmitted to the rubber diaphragm through the conduction cavity, so that air in front of the rubber diaphragm forms accurate air micro-jet flow; cavitation bubbles generated on the surface of the salt sculpture coating in the spraying process are timely collapsed, and the defects of bubbling, cracking and the like after the coating is cured are prevented.

Description

Technical Field

[0001] This invention relates to the field of coating spraying equipment technology, specifically to a salt-carved nano-composite moisture-proof coating spraying device and method. Background Technology

[0002] Salt sculpture, as a distinctive art form, is primarily made from natural sea salt or synthetic salt blocks, which are then shaped through processes such as cutting, pressing, carving, and embellishment. Because the salt substrate naturally contains impurities such as magnesium chloride and calcium chloride, these impurities naturally form an interconnected network of pores within the salt block, resulting in a large number of micron-sized pores within the finished salt sculpture. Simultaneously, traditional pressing or carving techniques further disrupt the dense structure of the salt block during the shaping process, significantly expanding the connectivity and size of the pores, ultimately creating a salt sculpture matrix structure with high porosity.

[0003] Due to the hygroscopic nature of salt, the highly porosity of the salt sculpture substrate easily absorbs moisture from the air in humid environments, leading to surface melting and deformation, severely impacting its exhibition effect and lifespan. To address this issue, existing technologies typically involve spraying a moisture-proof coating onto the salt sculpture surface to prevent external moisture intrusion and ensure the structural stability and aesthetic integrity of the sculpture in daily exhibition environments. However, the natural pores of the salt sculpture substrate can absorb solvents from the spray solution during the spraying process, resulting in uneven coating thickness and causing residual moisture to expand upon heating after curing, leading to blistering, cracking, and other quality problems that affect the long-term preservation and display of the salt sculpture. Therefore, those skilled in the art have proposed a salt sculpture nanocomposite moisture-proof coating spraying device and method to solve the aforementioned technical problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a salt sculpture nanocomposite moisture-proof coating spraying device and method, which solves the problem that the pores between salt crystals on the salt sculpture surface easily absorb the sprayed coating.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a salt-carved nano-composite moisture-proof coating spraying device, comprising... The electrical box has a paint box on top for storing spray paint, and a processing box on one side of the paint box. The processing box is connected to the corresponding positions on the outer walls of the electrical box and the paint box. The upper part of the processing box is equipped with a closed cover, and the four bottom corners of the closed cover are respectively connected to the corresponding corners of the processing box and the paint box. An opening door is provided on one side of the middle of the front end of the enclosure, and a control panel is provided on the other side of the middle of the front end of the enclosure. The negative pressure permeation mechanism, located on one side inside the sealed enclosure, is used to remove air from the internal pores of the salt sculpture before the coating is applied. An electrostatic spraying mechanism is located on one side of the front end of the inner wall of the enclosed enclosure. It is used to apply a coating to the salt sculpture surface after it has been treated by the negative pressure permeation mechanism using an electrostatic-assisted method. An ultrasonic auxiliary mechanism, located in the middle of one side of the enclosed enclosure, is used to assist the electrostatic spraying mechanism in spraying a coating onto the salt sculpture surface. The shaping mechanism, located on the top side of the enclosed cover, is used to shape the salt sculpture after surface spraying.

[0006] Preferably, the negative pressure permeation mechanism includes a vacuum generator, which is located at the upper rear side of the coating tank. The vacuum processing end of the vacuum generator is connected to the interior of the sealed cover via a connecting pipe. A track seat is located at the top center of the inner wall of the sealed cover, and a linearly movable module is located inside the track seat.

[0007] Preferably, the negative pressure permeation mechanism further includes a winding device. The winding device is located at the bottom center of the linear motion module. An impregnation chamber is opened at the top center of the treatment box. The impregnation chamber stores low-viscosity epoxy resin. A placement tray is located at the top of the impregnation chamber. An outer ring seat is rotatably connected to the middle of the outer wall of the placement tray. Multiple end magnetic seats are arranged in a circular array near the edge of the top of the outer ring seat. The bottom center of the winding device is connected to one end of the traction rope. The other end of the traction rope is connected to the end magnetic seats at corresponding positions. A cable bundle is provided in the upper middle part of the traction rope.

[0008] Preferably, the electrostatic spraying mechanism includes a magnetic fixing base, with multiple magnetic fixing bases arranged in a circumferential array near the bottom edge of the outer ring base, a cross groove base fixedly connected to the bottom center of the placement tray, multiple magnetic fixing columns arranged in a circumferential array on one side of the top center of the paint box, and a cross drive base rotatably connected to one side of the top center of the paint box, with a driver for driving its rotation provided at the bottom of the cross drive base.

[0009] Preferably, the electrostatic spraying mechanism further includes a mounting base three, which is provided on one side of the front end of the inner wall of the enclosed cover. A spray material row is provided in the middle of the mounting base three, and multiple tungsten carbide alloy electrode needles are equidistantly arranged on the spray material row. A plasma generator is provided on one side of the rear end of the inner wall of the enclosed cover, and a high-voltage power supply is provided in the middle of the rear side of the electrical box.

[0010] Preferably, the ultrasonic auxiliary mechanism includes a second mounting base. The second mounting base is located in the middle of the side of the inner wall of the sealed cover away from the immersion cavity. Multiple sets of inner grooves are equally spaced on one side of the second mounting base. A rubber diaphragm is provided at the bottom of the inner side of each inner groove. Multiple recesses are equally spaced on the surface of the rubber diaphragm. Multiple conduction cavities are equally spaced on the other side of the second mounting base. An ultrasonic generator is located in the middle of one side of the outer wall of the sealed cover.

[0011] Preferably, the shaping processing mechanism includes a plate dryer. The plate dryer is provided on one side of the rear end of the inner wall of the closed cover. A mounting base is provided on one side of the top center of the closed cover. Multiple annular cavities are equally spaced inside the mounting base. An annular rod is provided in the center of the inner side of each annular cavity. An excitation coil is provided on each annular rod.

[0012] Preferably, a method of using a salt-carved nanocomposite moisture-proof coating spraying device includes the following steps: Step 1: The staff puts the salt sculpture to be treated into the device, and then uses a negative pressure permeation mechanism to expel the gas in the gaps between the salt crystals of the salt sculpture. After the gas is expelled, the surface of the salt sculpture is then subjected to liquid permeation treatment. Step 2: After being processed by the negative pressure permeation mechanism, the salt sculpture is moved to the position of the electrostatic spraying mechanism, and then the surface is sprayed with a moisture-proof coating by the electrostatic spraying mechanism. Step 3: When spraying the salt sculpture, the cavitation bubbles on the coating surface are simultaneously eliminated using an ultrasonic auxiliary mechanism to ensure the aesthetics and smoothness of the coating surface after spraying. Step 4: After the moisture-proof coating is sprayed onto the surface of the salt sculpture, the shaping process unit performs multiple drying and shaping processes on the moisture-proof coating on the surface of the salt sculpture to complete the spraying and processing of the nano-composite moisture-proof coating on the surface of the salt sculpture.

[0013] Working Principle: When spraying a moisture-proof coating onto the surface of a salt sculpture, the negative pressure penetration mechanism is first activated. The worker opens the door of the sealed enclosure and places the salt sculpture on the tray inside. The worker then closes the door, creating a sealed processing space. Next, the vacuum generator on the paint tank is activated, creating a vacuum inside the enclosure. This negative pressure forces air out of the gaps between the salt crystals in the sculpture, improving the uniformity of the coating penetration on the outer surface. The reel at the bottom of the linear motion module is activated, and the reel releases the traction rope inside, causing the outer ring seat, the placement tray, and the salt sculpture on it to move downwards. When the salt sculpture on the placement tray moves into the impregnation chamber inside the processing box, the gaps between the salt crystals on the surface of the salt sculpture on the placement tray are filled by the low-viscosity epoxy resin impregnation in the impregnation chamber. After the epoxy resin cures, a primer layer is formed on the surface of the salt sculpture, which facilitates the subsequent spraying and adhesion of the spraying material. This completes the negative pressure degassing and primer penetration impregnation treatment of the salt sculpture before the spraying treatment.Then, the electrostatic spraying mechanism is activated. At this time, the winding device on the linear motion module drives the traction rope at its bottom to rise and reset. Simultaneously, the traction rope moves the outer ring seat, the placement plate, and the salt sculpture on it upwards to their initial positions. Then, the plasma generator on the sealed enclosure is activated, simultaneously introducing argon gas into the enclosure. Plasma etching is then used to introduce hydroxyl and carboxyl active groups onto the surface of the salt sculpture, thereby reducing the surface resistivity. The linear motion module then moves inside the track seat, thus moving the traction rope, the outer ring seat, the placement plate, and the salt sculpture on it to the position of the cross drive seat. This also causes the cross-shaped groove at the bottom of the placement tray to engage with the cross-shaped drive seat. At this time, the magnetic fixing seat at the bottom of the outer ring seat is also magnetically fixed by the magnetic fixing post. During the spraying process on the surface of the salt sculpture on the placement tray, the driver drives the cross-shaped drive seat to rotate. As the cross-shaped drive seat rotates, it drives the placement tray and the salt sculpture on it in the outer ring seat to rotate synchronously, thus ensuring the uniformity of spraying on all parts of the salt sculpture during the spraying process. Then, the staff releases the traction rope from the end magnetic fixing seat on the outer ring seat. The linear movement module drives the bottom winding device and traction rope to move back to their original position in the track seat. Then, the sprayer on the third mounting seat is installed. The spray gun is activated, simultaneously applying a water-based primer containing carbon nanotubes to the surface of the salt sculpture. This creates a conductive layer on the surface under spraying pressure. After the conductive layer is applied, the salt sculpture is allowed to dry for a period of time. Then, the high-voltage power supply in the electrical box is activated. Through the coordinated operation of the high-voltage power supply and the tungsten carbide alloy electrode needles on the spray gun, a strong electric field is generated at the tip of the tungsten carbide alloy electrode needles due to their small radius of curvature, forming a corona discharge zone. At the same time, the compressed air from the spray gun atomizes the paint composed of various spraying materials into droplets of a certain size. Therefore, an electrostatic field is established on the surface of the salt sculpture during the spraying process, and the spray gun releases... The negative charge and the positive charge on the surface of the salt sculpture form an initial electric field. The charged paint particles form a "space charge cloud" during flight, which generates a secondary electric field. At the same time, the "DC + pulse" composite power supply of the high voltage power supply periodically destroys the charge shielding layer in the deep recess of the salt sculpture, increasing the penetration depth of the electric lines. During the adsorption process, the axial airflow of the spray nozzle pushes the particles to the surface of the salt sculpture. The deep recess forms a local negative pressure zone due to geometric contraction, which induces the particles to gather. When the particles approach the salt sculpture, the electrostatic force exceeds the airflow drag force, causing the particles to be vertically adsorbed on the surface of the deep recess. At the same time, the electric field strength at the edge of the deep recess is reduced by segmented power supply, and a local electric field gradient is formed on both sides of the deep recess, which inhibits the accumulation of paint at the edge. This completes the electrostatic assisted spraying treatment of the salt sculpture.Simultaneously, the ultrasonic auxiliary mechanism is activated. While the electrostatic spraying mechanism is spraying the salt sculpture surface, the ultrasonic generator on the sealed cover is activated. The ultrasonic generator generates ultrasonic vibrations upon activation, which are conducted into the transmission cavity within the mounting base. The ultrasonic waves entering the transmission cavity are then dispersed and conducted into corresponding inner grooves. The ultrasonic waves entering the inner grooves vibrate the rubber diaphragm and the air in front of it, causing deformation of the rubber diaphragm. Due to the thin wall of the recessed portion of the rubber diaphragm and the deformation, the air in front of the diaphragm generates micro-air jets under the action of the ultrasonic waves. When these micro-air jets reach the surface of the salt sculpture coating, they collapse the cavitation bubbles generated during the spraying process, thereby improving the smoothness and aesthetics of the subsequent cured coating. This completes the ultrasonic-assisted treatment during the salt sculpture spraying process. Afterwards, the shaping mechanism is activated to further refine the surface of the salt sculpture. After the nano-composite moisture-proof coating is applied, the plate dryer on the sealed cover is activated. Simultaneously, the plate dryer dries the coating on the salt sculpture surface. During this drying process, the driver synchronizes the rotation of the cross drive seat, cross groove seat, placement tray, and the salt sculpture on it, ensuring uniform drying. At the same time, the excitation coil on the annular rod is energized, generating a high-frequency alternating magnetic field inside the annular cavity. This magnetic field penetrates the mounting base and reaches the surface of the salt sculpture on the placement tray, creating a skin effect within the coating. The current density decreases exponentially with depth. The auxiliary heating from the plate dryer stabilizes the temperature of the coating material on the salt sculpture surface at approximately 60 degrees Celsius, accelerating the cross-linking of the coating while preventing overheating and softening of the salt sculpture. This completes the auxiliary shaping process of the coating material on the salt sculpture surface.

[0014] This invention provides a salt-carved nanocomposite moisture-proof coating spraying device and method. It has the following beneficial effects: 1. This invention, by adding and setting a negative pressure penetration mechanism, first creates a vacuum negative pressure state inside the sealed chamber using a vacuum generator before spraying paint onto the surface of the salt sculpture. This effectively removes air from the pores of the salt sculpture, preventing residual air from adsorbing the solvent of the spray liquid during subsequent spraying and reducing the problem of uneven coating thickness at the source. Secondly, the winding device moves the salt sculpture down into the immersion chamber, where low-viscosity epoxy resin is used to impregnate the salt sculpture, filling the surface and internal pores. The primer layer formed after curing not only improves the density of the salt sculpture surface but also provides a good adhesion base for the subsequent moisture-proof coating, ensuring a more stable bond between the subsequent coating and the salt sculpture substrate.

[0015] 2. This invention adds and sets up an electrostatic spraying mechanism. During the coating process on the surface of the salt sculpture, the mechanism treats the surface of the salt sculpture with a plasma generator, introduces active groups to reduce the surface resistivity, and creates conditions for the establishment of an electrostatic field. Combined with the corona discharge zone formed by the high-voltage power supply and tungsten carbide alloy electrode needles, the coating particles can be charged and directionally adsorbed onto the surface of the salt sculpture, which can improve the coating coverage, especially for deep recesses. On the other hand, the driver drives the salt sculpture to rotate. Combined with the spraying action of the spray nozzle, it can not only ensure that the coating is uniform in all parts of the salt sculpture, but also control the electric field strength through segmented power supply to avoid coating accumulation at the edges of deep recesses, further improving the coating quality.

[0016] 3. By adding and setting an ultrasonic auxiliary mechanism, this invention can generate vibrations through an ultrasonic generator during the coating process on the surface of salt sculptures. This vibrations are transmitted to the rubber diaphragm through the conduction cavity, causing the air in front of the rubber diaphragm to form a precise air micro-jet. This effectively eliminates cavitation bubbles generated on the surface of the salt sculpture coating during the spraying process, preventing defects such as blistering and cracking after the coating has cured. Furthermore, the recessed design on the rubber diaphragm can optimize the range and intensity of the micro-jet, ensuring that cavitation bubbles in all areas of the salt sculpture surface can be effectively treated. This avoids the impact of cavitation bubble residue on the smoothness of the coating and significantly improves the appearance integrity and aesthetics of the salt sculpture coating after curing.

[0017] 4. By adding and setting a shaping processing mechanism, after the coating is sprayed onto the surface of the salt sculpture, the salt sculpture is dried by a plate dryer. With the rotation of the salt sculpture, the coating can be heated and dried evenly in all parts, avoiding uneven shrinkage caused by local drying speed differences. At the same time, the high-frequency alternating magnetic field generated by the excitation coil can penetrate into the interior of the salt sculpture coating, accelerating the cross-linking and curing of the coating material. It can also precisely control the coating temperature, ensuring shaping efficiency while preventing the salt sculpture from softening and deforming due to overheating, thus balancing the shaping effect of the coating with the structural integrity of the salt sculpture substrate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a schematic cross-sectional view of the internal structure of the front side of the enclosure of the present invention; Figure 4 This is a cross-sectional schematic diagram of the internal structure of the rear side of the enclosure of the present invention; Figure 5 This is a partial structural diagram of the linear motion module of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the placement tray of the present invention; Figure 7 This is a schematic diagram of three partial structures of the mounting base of the present invention; Figure 8 This is a schematic diagram of the left side structure of the mounting base 2 of the present invention; Figure 9 This is a schematic diagram of the right side structure of the mounting base 2 of the present invention; Figure 10 This is a cross-sectional view of the internal structure of the mounting base of the present invention.

[0019] The components include: 1. Electrical box; 2. Paint box; 3. Ultrasonic generator; 4. Enclosed cover; 5. Mounting base one; 6. Control panel; 7. Opening door; 8. Processing box; 9. Plasma generator; 10. Plate dryer; 11. High-voltage power supply; 12. Vacuum generator; 13. Winding reel; 14. Cable bundle; 15. Traction rope; 16. Placement tray; 17. Immersion chamber; 18. Cross drive seat; 19. Driver; 20. Magnetic fixing column; 21. Mounting base two; 22. Track seat; 23. Linear movement module; 24. Mounting base three; 25. Outer ring seat; 26. End magnetic seat; 27. Magnetic fixing seat; 28. Cross groove seat; 29. ​​Spray nozzle; 30. Tungsten carbide alloy electrode needle; 31. Inner groove; 32. Rubber diaphragm; 33. Recessed part; 34. Conducting cavity; 35. Ring rod; 36. Ring cavity; 37. Excitation coil. Detailed Implementation

[0020] The technical solutions in the embodiments 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 - Appendix Figure 2 This invention provides a salt-carved nano-composite moisture-proof coating spraying device, including an electrical box 1. The top of the electrical box 1 is provided with a paint box 2 for storing spraying paint. A processing box 8 is provided on one side of the paint box 2, and one side of the processing box 8 is connected to the corresponding positions of the outer walls of the electrical box 1 and the paint box 2. A sealing cover 4 is provided on the upper part of the processing box 8, and the four corners of the bottom end of the sealing cover 4 are connected to the corresponding corners of the processing box 8 and the paint box 2. An opening door 7 is provided on one side of the middle part of the front end of the sealing cover 4, and a control panel 6 is provided on the other side of the middle part of the front end of the sealing cover 4. Please see the appendix Figure 3 - Appendix Figure 5 The negative pressure permeation mechanism is located on one side inside the sealed cover 4 and is used to remove the gas from the internal gaps of the salt sculpture before the coating spraying process. The negative pressure permeation mechanism includes a vacuum generator 12. The vacuum generator 12 is located in the upper rear part of the paint tank 2, and the vacuum processing end of the vacuum generator 12 is connected to the interior of the sealed cover 4 through a connecting pipe. A track seat 22 is located in the middle of the top of the inner wall of the sealed cover 4, and a linear moving module 23 that can move linearly is located inside the track seat 22.

[0022] When the negative pressure penetration mechanism is activated, the staff first opens the door 7 on the sealed cover 4 to be processed, and then places it on the placement tray 16 inside the sealed cover 4. Then, the staff resets and closes the door 7 on the sealed cover 4, thus forming a sealed processing space inside the sealed cover 4. After that, the vacuum generator 12 on the paint tank 2 is activated. At the same time, the vacuum generator 12 draws the inside of the sealed cover 4 into a vacuum negative pressure state, thereby expelling the air between the salt crystal gaps in the salt sculpture through negative pressure, which facilitates the uniformity of the subsequent coating penetration on the outer surface of the salt sculpture.

[0023] The negative pressure permeation mechanism also includes a winding reel 13. The winding reel 13 is located at the bottom center of the linear motion module 23. An impregnation chamber 17 is located at the top center of the treatment box 8. The impregnation chamber 17 stores low-viscosity epoxy resin. A placement tray 16 is located at the top of the impregnation chamber 17. An outer ring seat 25 is rotatably connected to the outer wall center of the placement tray 16. Multiple end magnetic seats 26 are arranged in a circular array near the edge of the top of the outer ring seat 25. The bottom center of the winding reel 13 is connected to one end of the traction rope 15. The other end of the traction rope 15 is connected to the end magnetic seats 26 at the corresponding positions. A cable bundle tube 14 is located in the upper middle part of the traction rope 15.

[0024] Then, the reel 13 at the bottom of the linear motion module 23 is activated. When the reel 13 is activated, the traction rope 15 inside is discharged, which causes the outer ring seat 25, the placement tray 16 and the salt sculpture on it connected to the traction rope 15 to move down. When the salt sculpture on the placement tray 16 moves down into the impregnation chamber 17 in the processing box 8, the gaps between the salt crystals on the surface of the salt sculpture on the placement tray 16 are filled by the low viscosity epoxy resin impregnation in the impregnation chamber 17. After the epoxy resin cures, a primer layer is formed on the surface of the salt sculpture, which facilitates the subsequent spraying and adhesion of the spraying material. This completes the negative pressure degassing and primer penetration impregnation treatment of the salt sculpture before the spraying treatment.

[0025] Please see the appendix Figure 6 - Appendix Figure 7 An electrostatic spraying mechanism is located on one side of the front end of the inner wall of the closed cover 4. It is used to apply a coating to the salt sculpture surface after the negative pressure penetration mechanism is treated by electrostatic assistance. The electrostatic spraying mechanism includes a magnetic fixing seat 27. Multiple magnetic fixing seats 27 are arranged in a circular array near the bottom edge of the outer ring seat 25. A cross groove seat 28 is fixedly connected to the bottom center of the placement tray 16. Multiple magnetic fixing posts 20 are arranged in a circular array on one side of the top center of the paint box 2. A cross drive seat 18 is rotatably connected to one side of the top center of the paint box 2. A driver 19 for driving the cross drive seat 18 to rotate is provided at the bottom of the cross drive seat 18.

[0026] When the electrostatic spraying mechanism is started, the winding device 13 on the linear moving module 23 drives the traction rope 15 at its bottom to rise and reset. At the same time as the traction rope 15 rises and resets, it drives the outer ring seat 25, the placement plate 16 and the salt sculpture on it to move upward and reset to the initial position. Then the plasma generator 9 on the closed cover 4 is started. At the same time as the plasma generator 9 is started, argon gas is introduced into the closed cover 4. Then, plasma etching is used to introduce hydroxyl and carboxyl active groups on the surface of the salt sculpture, thereby reducing the resistivity of the surface of the salt sculpture product.

[0027] Then, the linear motion module 23 moves inside the track seat 22, thereby moving the traction rope 15, outer ring seat 25, placement tray 16 and the salt sculpture on it to the position of the cross drive seat 18. At the same time, the cross groove seat 28 at the bottom of the placement tray 16 is engaged into the cross drive seat 18. At this time, the magnetic fixing seat 27 at the bottom of the outer ring seat 25 is also magnetically fixed by the magnetic fixing post 20. During the spraying process on the surface of the salt sculpture on the placement tray 16, the driver 19 drives the cross drive seat 18 to rotate. While the cross drive seat 18 is rotating, it drives the placement tray 16 and the salt sculpture on it inside the outer ring seat 25 to rotate synchronously, thereby ensuring the uniformity of spraying at all positions of the salt sculpture during the spraying process. Then, the staff releases the traction rope 15 from the end magnetic fixing seat 26 above the outer ring seat 25. The linear motion module 23 moves the bottom winding device 13 and the traction rope 15 within the track seat 22 to return to the original position.

[0028] The electrostatic spraying mechanism also includes a mounting base 24. The mounting base 24 is located on one side of the front end of the inner wall of the enclosed cover 4. A spraying material row 29 is located in the middle of the mounting base 24. Multiple tungsten carbide alloy electrode needles 30 are equidistantly arranged on the spraying material row 29. A plasma generator 9 is located on one side of the rear end of the inner wall of the enclosed cover 4. A high-voltage power supply 11 is located in the middle of the rear side of the electrical box 1.

[0029] Then, the spray nozzle 29 on the mounting base 3 24 is started. At the same time, the spray nozzle 29 sprays a water-based primer containing carbon nanotubes onto the surface of the salt sculpture, so that a conductive layer is formed on the surface of the salt sculpture under spraying pressure. After the conductive layer is sprayed, the salt sculpture is left to dry for a period of time. Then, the high-voltage power supply 11 on the electrical box 1 is started. Through the coordinated operation of the high-voltage power supply 11 and the tungsten carbide alloy electrode needle 30 on the spray nozzle 29, the tip of the tungsten carbide alloy electrode needle 30 generates a strong electric field due to its small radius of curvature during the spraying process of the spray nozzle 29, forming a corona discharge area.

[0030] Simultaneously, the compressed air from the spray nozzle 29 atomizes the paint composed of various spraying materials into a group of droplets of a certain size. Therefore, during the spraying process on the surface of the salt sculpture, an electrostatic field is established on its surface. The negative charge released by the spray nozzle 29 and the positive charge on the surface of the salt sculpture form an initial electric field. The charged paint particles form a "space charge cloud" during flight, which superimposes to generate a secondary electric field. At the same time, the "DC + pulse" composite power supply of the high-voltage power supply 11 periodically destroys the charge shielding layer in the deep recesses of the salt sculpture, increasing the penetration depth of the electric field lines.

[0031] During the adsorption process, the axial airflow of the spray nozzle 29 pushes the particles to the surface of the salt sculpture. The deep recesses form a local negative pressure zone due to geometric contraction, which induces the particles to aggregate. When the particles approach the salt sculpture, the electrostatic force exceeds the airflow drag force, causing the particles to be vertically adsorbed onto the surface of the deep recesses. At the same time, the electric field strength at the edge of the deep recesses is reduced by segmented power supply, and a local electric field gradient is formed on both sides of the deep recesses to suppress the accumulation of edge coatings. This completes the electrostatic assisted spraying treatment of the salt sculpture.

[0032] Please see the appendix Figure 8 - Appendix Figure 9 An ultrasonic auxiliary mechanism is located in the middle of one side of the enclosed cover 4 and is used to assist the electrostatic spraying mechanism in spraying a coating onto the salt sculpture surface. The ultrasonic auxiliary mechanism includes a second mounting base 21. The second mounting base 21 is located in the middle of the side of the inner wall of the sealed cover 4 away from the immersion cavity 17. Multiple sets of inner grooves 31 are equally spaced on one side of the second mounting base 21. A rubber diaphragm 32 is provided at the bottom of the inner side of each inner groove 31. Multiple recesses 33 are equally spaced on the surface of the rubber diaphragm 32. Multiple conduction cavities 34 are equally spaced on the other side of the second mounting base 21. An ultrasonic generator 3 is located in the middle of one side of the outer wall of the sealed cover 4.

[0033] When the ultrasonic auxiliary mechanism is started, the ultrasonic generator 3 on the sealed cover 4 is started when the electrostatic spraying mechanism sprays the salt sculpture surface. The ultrasonic generator 3 generates ultrasonic vibration at the same time as it is started. The ultrasonic vibration generated is conducted into the conduction cavity 34 in the mounting base 21. Then, the ultrasonic waves entering the conduction cavity 34 are dispersed and conducted into the corresponding inner grooves 31. The ultrasonic waves entering the inner grooves 31 vibrate the rubber diaphragm 32 inside and the air in front of it, causing the rubber diaphragm 32 to deform.

[0034] Furthermore, due to the thin wall and deformation of the recessed portion 33 on the rubber diaphragm 32, the air at the front of the rubber diaphragm 32 generates air micro-jet under the action of ultrasound. When the air micro-jet reaches the surface of the salt sculpture coating, it annihilates the cavitation bubbles generated during the spraying process of the salt sculpture coating, thereby improving the smoothness and aesthetics of the subsequent salt sculpture surface coating after curing. This completes the ultrasonic-assisted treatment during the spraying process of the salt sculpture.

[0035] Please see the appendix Figure 10 A shaping treatment mechanism is located on the top side of the enclosed cover 4 and is used to shape the salt sculpture after surface spraying treatment.

[0036] The shaping and processing mechanism includes a plate dryer 10. The plate dryer 10 is installed on one side of the rear end of the inner wall of the closed cover 4. The mounting base 5 is installed on one side of the top center of the closed cover 4. Multiple annular cavities 36 are equidistantly opened inside the mounting base 5. An annular rod 35 is installed in the middle of the inner side of each annular cavity 36. An excitation coil 37 is installed on each annular rod 35.

[0037] When the shaping and processing mechanism is started, after the nano-composite moisture-proof coating is sprayed on the surface of the salt sculpture, the plate dryer 10 on the sealed cover 4 is started. The plate dryer 10 dries the coating on the surface of the salt sculpture at the same time as it is started. During the drying process, the driver 19 drives the cross drive seat 18, cross groove seat 28, placement plate 16 and the salt sculpture on it to rotate synchronously, thereby ensuring the uniformity of drying.

[0038] Simultaneously, the excitation coil 37 on the annular rod 35 is energized. While energized, the excitation coil 37 generates a high-frequency alternating magnetic field inside the annular cavity 36. This high-frequency alternating magnetic field penetrates the mounting base 5 and reaches the surface of the salt sculpture on the placement tray 16. At the same time, a skin effect is generated within the coating on the surface of the salt sculpture. The current density is high but gradually decreases with depth. With the auxiliary heating of the plate dryer 10, the temperature of the coating material on the surface of the salt sculpture is stabilized at around 60 degrees Celsius. This accelerates the cross-linking of the coating while preventing the salt sculpture from softening due to overheating, thus completing the auxiliary shaping treatment of the sprayed material on the surface of the salt sculpture. A method for using a salt-carved nano-composite moisture-proof coating spraying device includes the following steps: Step 1: The staff puts the salt sculpture to be treated into the device, and then uses a negative pressure permeation mechanism to expel the gas in the gaps between the salt crystals of the salt sculpture. After the gas is expelled, the surface of the salt sculpture is then subjected to liquid permeation treatment. Step 2: After being processed by the negative pressure permeation mechanism, the salt sculpture is moved to the position of the electrostatic spraying mechanism, and then the surface is sprayed with a moisture-proof coating by the electrostatic spraying mechanism. Step 3: When spraying the salt sculpture, the cavitation bubbles on the coating surface are simultaneously eliminated using an ultrasonic auxiliary mechanism to ensure the aesthetics and smoothness of the coating surface after spraying. Step 4: After the moisture-proof coating is sprayed onto the surface of the salt sculpture, the shaping process unit performs multiple drying and shaping processes on the moisture-proof coating on the surface of the salt sculpture to complete the spraying and processing of the nano-composite moisture-proof coating on the surface of the salt sculpture.

[0039] This method, through a step-by-step process of "negative pressure infiltration – electrostatic spraying," effectively solves the spraying challenges posed by the high porosity of salt sculptures. The first step removes gas from the pores within the salt crystals of the sculpture, preventing solvent adsorption during subsequent spraying and reducing uneven coating thickness from the outset. The subsequent immersion infiltration process fills the pores on the surface and inside the salt sculpture, forming a basic adhesion layer and creating conditions for stable bonding of the moisture-proof coating. The salt sculpture is then transferred to the electrostatic spraying unit, where the pre-treated surface is targeted for spraying, resulting in more even coverage of the moisture-proof coating. This method effectively improves the poor coating adhesion caused by the porosity of the salt sculpture in traditional spraying, laying a solid foundation for the quality of subsequent coatings. In the spraying and setting stages, this method further enhances coating quality and salt sculpture stability through "synchronous assistance + multiple setting." During spraying, an ultrasonic auxiliary mechanism is simultaneously activated to eliminate cavitation bubbles on the coating surface in real time. This not only prevents blistering and cracking defects after coating curing but also ensures the smoothness and aesthetics of the coating surface, meeting the artistic display requirements of the salt sculpture. The multiple drying and setting processes after spraying accelerate the cross-linking and curing of the moisture-proof coating, improving processing efficiency. Precise setting control also prevents the salt sculpture from softening and deforming due to overheating, ensuring that while achieving excellent moisture-proof performance, the salt sculpture maintains its original shape and structural integrity, extending its exhibition and preservation lifespan.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A salt-carved nano-composite moisture-proof coating spraying device, characterized in that, include An electrical box (1) is provided with a paint box (2) for storing spray paint on the top of the electrical box (1). A processing box (8) is provided on one side of the paint box (2), and one side of the processing box (8) is connected to the corresponding position of the outer wall of the electrical box (1) and the paint box (2). The upper part of the processing box (8) is provided with a closed cover (4), and the four corners of the bottom end of the closed cover (4) are respectively connected to the corresponding corners of the processing box (8) and the paint box (2); An opening door (7) is provided on one side of the middle of the front end of the enclosure (4), and a control panel (6) is provided on the other side of the middle of the front end of the enclosure (4). The negative pressure permeation mechanism is located on one side inside the closed cover (4) and is used to remove the gas from the internal gaps of the salt sculpture before the coating spraying process. An electrostatic spraying mechanism is set on one side of the front end of the inner wall of the closed cover (4) and is used to spray a coating on the salt sculpture surface after the negative pressure penetration mechanism is treated by electrostatic assistance. An ultrasonic auxiliary mechanism is set in the middle of one side of the enclosed cover (4) and is used to assist the electrostatic spraying mechanism in spraying the coating on the salt sculpture surface. A shaping treatment mechanism is set on the top side of the enclosed cover (4) for shaping the salt sculpture after surface spraying treatment.

2. The salt-carved nano-composite moisture-proof coating spraying device according to claim 1, characterized in that, The negative pressure permeation mechanism includes a vacuum generator (12). The vacuum generator (12) is provided in the upper middle part of the rear side of the coating tank (2). The vacuum processing end of the vacuum generator (12) is connected to the interior of the sealed cover (4) through a connecting pipe. The top middle part of the inner wall of the sealed cover (4) is provided with a track seat (22). The interior of the track seat (22) is provided with a linearly movable module (23).

3. The salt-carved nano-composite moisture-proof coating spraying device according to claim 2, characterized in that, The negative pressure permeation mechanism also includes a winding device (13). The winding device (13) is provided at the bottom center of the linear motion module (23). The top center of the treatment box (8) is provided with an impregnation chamber (17). The impregnation chamber (17) stores low viscosity epoxy resin. The top of the impregnation chamber (17) is provided with a placement plate (16). The outer wall of the placement plate (16) is rotatably connected to an outer ring seat (25). The top of the outer ring seat (25) is surrounded by a circumferential array of multiple end magnetic seats (26) near the edge. The bottom center of the winding device (13) is connected to one end of the traction rope (15). The other end of the traction rope (15) is connected to the end magnetic seats (26) at the corresponding positions. The upper middle part of the traction rope (15) is provided with a wire bundle tube (14).

4. The salt-carved nano-composite moisture-proof coating spraying device according to claim 3, characterized in that, The electrostatic spraying mechanism includes a magnetic fixing seat (27). The bottom end of the outer ring seat (25) is surrounded by a circumferential array of multiple magnetic fixing seats (27). The bottom end of the placement tray (16) is fixedly connected to a cross groove seat (28). The top end of the paint box (2) is surrounded by a circumferential array of multiple magnetic fixing columns (20). The top end of the paint box (2) is rotatably connected to a cross drive seat (18). The bottom of the cross drive seat (18) is provided with a driver (19) to drive its rotation.

5. The salt-carved nano-composite moisture-proof coating spraying device according to claim 4, characterized in that, The electrostatic spraying mechanism also includes a mounting base three (24). The mounting base three (24) is provided on one side of the front end of the inner wall of the closed cover (4). The middle of the mounting base three (24) is provided with a spray bar (29). Multiple tungsten steel alloy electrode needles (30) are equidistantly arranged on the spray bar (29). A plasma generator (9) is provided on one side of the rear end of the inner wall of the closed cover (4). A high voltage power supply (11) is provided in the middle of the rear side of the electrical box (1).

6. The salt-carved nano-composite moisture-proof coating spraying device according to claim 1, characterized in that, The ultrasonic auxiliary mechanism includes a second mounting base (21). The second mounting base (21) is located in the middle of the side of the inner wall of the closed cover (4) away from the immersion cavity (17). Multiple sets of inner grooves (31) are equally spaced on one side of the second mounting base (21). A rubber diaphragm (32) is provided at the bottom of the inner side of each inner groove (31). Multiple recesses (33) are equally spaced on the surface of the rubber diaphragm (32). Multiple conduction cavities (34) are equally spaced on the other side of the second mounting base (21). An ultrasonic generator (3) is located in the middle of one side of the outer wall of the closed cover (4).

7. The salt-carved nano-composite moisture-proof coating spraying device according to claim 1, characterized in that, The shaping and processing mechanism includes a plate dryer (10). The plate dryer (10) is provided on one side of the rear end of the inner wall of the closed cover (4). A mounting seat (5) is provided on one side of the top center of the closed cover (4). Multiple annular cavities (36) are equally spaced inside the mounting seat (5). An annular rod (35) is provided on the inner center of each annular cavity (36). An excitation coil (37) is provided on each annular rod (35).

8. The method of using the salt-carved nano-composite moisture-proof coating spraying device according to any one of claims 1-7, characterized in that, The following usage steps are included: Step 1: The staff puts the salt sculpture to be treated into the device, and then uses a negative pressure permeation mechanism to expel the gas in the gaps between the salt crystals of the salt sculpture. After the gas is expelled, the surface of the salt sculpture is then subjected to liquid permeation treatment. Step 2: After being processed by the negative pressure permeation mechanism, the salt sculpture is moved to the position of the electrostatic spraying mechanism, and then the surface is sprayed with a moisture-proof coating by the electrostatic spraying mechanism. Step 3: When spraying the salt sculpture, the cavitation bubbles on the coating surface are simultaneously eliminated using an ultrasonic auxiliary mechanism to ensure the aesthetics and smoothness of the coating surface after spraying. Step 4: After the moisture-proof coating is sprayed onto the surface of the salt sculpture, the shaping process unit performs multiple drying and shaping processes on the moisture-proof coating on the surface of the salt sculpture to complete the spraying and processing of the nano-composite moisture-proof coating on the surface of the salt sculpture.

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