A spray coating apparatus

Abstract

The application discloses a spraying device and relates to the technical field of spraying, which comprises a rack, a spraying assembly arranged in the rack, a conveying assembly arranged above the spraying assembly and a paint recovery mechanism arranged above the conveying assembly. The conveying assembly comprises a plurality of transmission rollers, at least one spraying interval is arranged between the plurality of transmission rollers, and a spraying end of the spraying assembly is arranged in the spraying interval. A top surface of the conveying assembly is a product placement area, a spraying direction of the spraying assembly is towards the product placement area, and a safety interval is arranged between the paint recovery mechanism and the product when the product is located in the product placement area. By constructing a vertically-stacked functional module layout in the rack, the conveying assembly is used to carry the product and reserve the spraying interval, the paint recovery mechanism is arranged above the conveying assembly and keeps the safety interval, the excess paint can be effectively captured, the risk of the product contacting the conveying assembly is reduced, the controllable and adjustable coating thickness and the continuous and stable production process are realized.

Description

Technical Field

[0001] This invention relates to the field of spraying technology, and more specifically to a spraying device. Background Technology

[0002] Currently, in the field of surface coating processing for products such as sheets and films, manual application or simple mechanical spraying is usually used. This often results in uneven coating thickness and poor spraying continuity. Moreover, during the spraying process, excess coating material adheres to the equipment, interfering with the coating effect. The lack of effective coating recycling mechanisms and precise process control methods makes it difficult to meet the high-efficiency and high-quality processing requirements of modern continuous production. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a spraying device that achieves precise spraying, automatic recycling, and continuous and stable operation of paint by vertically arranging spraying components, in conjunction with conveying components and paint recycling mechanisms.

[0004] The present invention provides a spraying device, the spraying device comprising: a frame, a spraying assembly disposed within the frame, a conveying assembly disposed above the spraying assembly, and a paint recovery mechanism disposed above the conveying assembly; The conveying assembly includes several drive rollers, and at least one spraying gap is provided between the several drive rollers. The spraying end of the spraying assembly is located within the spraying gap. The top surface of the conveying component is the product placement area, and the spraying direction of the spraying component is towards the product placement area. When the product is located in the product placement area, a safe distance is provided between the paint recycling mechanism and the product.

[0005] Furthermore, the paint recycling mechanism includes: a conveyor belt and several scrapers, the scrapers being disposed above the conveyor belt; The conveyor belt is provided with material collection troughs on both sides, and the scraper is located between the two material collection troughs.

[0006] Furthermore, the paint recycling mechanism also includes a height adjustment mechanism for adjusting the relative height between the conveyor belt and the conveying assembly.

[0007] Furthermore, the conveying assembly includes a transmission mechanism and a driving component, with a plurality of transmission rollers disposed within the transmission mechanism, and the driving component drivingly connected to the transmission mechanism; The outer circumference of the drive roller is provided with a number of circular pieces, and the circular pieces of any two adjacent drive rollers are staggered.

[0008] Furthermore, the conveying assembly also includes several scraper baffles, which are arranged one-to-one on several drive rollers.

[0009] Furthermore, the spraying assembly includes: a spraying cabinet, a plurality of spray guns disposed inside the spraying cabinet, and a guide trough disposed above the spray guns; The flow channel is a frame structure, and the upper end of the frame structure is set as a conical flow guide structure.

[0010] Furthermore, the spraying assembly also includes a lifting mechanism, which includes a lifting drive and a connecting bracket. The lifting drive is disposed on the outer wall of the spraying cabinet and drives the connecting bracket. The guide channel is disposed on the connecting bracket. The top of the guide channel is driven to rise within the spraying spacing of the conveying assembly by the lifting mechanism, or the top of the guide channel is driven to descend below the conveying assembly by the lifting mechanism.

[0011] Furthermore, the spraying assembly also includes a gate opening and closing mechanism, which includes an actuating rod, a gate plate, and a gate driving component; The actuating lever is rotatably connected inside the spray booth, the door panel is mounted on the actuating lever, and the door panel is located between the spray gun and the guide channel; The gate drive unit is located on the outer wall of the spray booth, and the gate drive unit is connected to the actuating rod.

[0012] Furthermore, a return trough is provided below the spraying cabinet, which is used to collect the spraying residue from the spraying components.

[0013] Furthermore, a pulley assembly is provided on the frame, and the spraying assembly is installed in the frame based on the pulley assembly. The pulley assembly includes: a guide rail provided in the frame, a fixed pulley provided at one end of the guide rail, and a double pulley assembly that is slidably engaged on the guide rail. The bottom of the spraying assembly is provided with a mounting bracket, the fixed pulley is slidably connected to the mounting bracket, and the double pulley group is provided at one end of the mounting bracket.

[0014] This invention provides a spraying device that, by constructing a vertically stacked functional module layout within the frame, utilizes a conveyor assembly to carry the product and reserves a spraying gap, enabling the spraying assembly to accurately coat the product from bottom to top or from top to bottom. Simultaneously, a paint recovery mechanism is set above the conveyor assembly while maintaining a safe distance, which not only avoids interference and collision between the recovery mechanism and the moving product, but also ensures that excess paint can be effectively captured, thereby achieving controllable and adjustable coating thickness and continuous and stable production process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the spraying equipment in an embodiment of the present invention; Figure 2 This is an exploded view of the spraying equipment in an embodiment of the present invention; Figure 3 This is a schematic diagram of the conveying assembly of the spraying equipment in an embodiment of the present invention; Figure 4 This is a schematic diagram of the paint recycling mechanism of the spraying equipment in an embodiment of the present invention; Figure 5 This is a schematic diagram of the material collection tank of the paint recycling mechanism in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the spraying component of the spraying equipment in an embodiment of the present invention; Figure 7 This is an exploded view of the internal structure of the spraying assembly in an embodiment of the present invention; Figure 8 This is a schematic diagram of the frame structure of the spraying equipment in an embodiment of the present invention; Figure 9 This is a schematic diagram of the extended state of the spraying component of the spraying equipment in an embodiment of the present invention. Detailed Implementation

[0016] The technical solutions of 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.

[0017] Example: refer to Figure 1 and Figure 2 This embodiment provides a spraying device, which includes a frame 1, a spraying component 2 disposed within the frame 1, a conveying component 3 disposed above the spraying component 2, and a paint recovery mechanism 4 disposed above the conveying component 3. The frame 1 serves as the supporting foundation for the entire device, and its internal space is divided into three functional levels: lower, middle, and upper, which respectively accommodate the spraying component 2, the conveying component 3, and the paint recovery mechanism 4. By adopting a vertically stacked architecture design, a gravity-assisted recovery-based spraying device working system can be realized.

[0018] For details, please refer to Figure 3The conveying assembly 3 includes several drive rollers 31, and at least one spraying gap 32 is provided between the drive rollers 31. The spraying end of the spraying assembly 2 is located within the spraying gap 32. The spraying gap 32 refers to the physical gap reserved between two adjacent drive rollers 31, and the size of the gap must be large enough to accommodate the extension of the spraying end actuator of the spraying assembly 2.

[0019] In this embodiment, the spraying assembly 2 adopts a bottom-up spraying method. The spraying spacing 32 is the necessary channel for the paint to be sprayed upwards. Gravity is used to allow unattached paint to fall naturally back to the recovery area below, reducing the disorderly diffusion of paint mist in the horizontal direction. At the same time, the arrangement density of the drive rollers 31 and the position of the spraying spacing 32 can be customized according to the product size and spraying coverage requirements. For example, for large-format film products, multiple equidistant spraying spacings 32 can be set to achieve multi-station continuous operation.

[0020] Specifically, the top surface of the conveying component 3 is the product placement area 6, and the spraying direction of the spraying component 2 is towards the product placement area 6. When the product is located in the product placement area 6, a safe distance is set between the paint recycling mechanism 4 and the product, that is, the product bearing plane is formed by the highest points of several transmission rollers 31. The product is placed on several transmission rollers 31 to achieve directional conveying of the product.

[0021] Furthermore, the safety distance is a vertical reserved space between the top surface of the product and the bottom surface of the paint recycling mechanism 4 during the conveying process. This ensures that the top surface of the product and the bottom surface of the paint recycling mechanism 4 do not come into contact with each other. Since the bottom surface of the paint recycling mechanism 4 will adhere to the paint residue during the spraying process, by setting the safety distance, the paint residue on the bottom surface of the paint recycling mechanism 4 is prevented from adhering to the top surface of the product during the conveying process, which would affect the product appearance or the uniformity of the spraying. At the same time, it provides necessary buffer space for the product to shake, warp or thickness tolerance that may occur during the conveying process, and prevents irregularly shaped products or film products running at high speed from mechanically colliding with the recycling mechanism, thereby ensuring the reliability and uniformity of the product conveying and spraying.

[0022] Furthermore, in practical applications, the height value of the safety distance is usually determined based on the maximum allowable deformation of the product to be processed and the atomization cone angle of the coating. For example, when spraying thin film products, the safety distance can be set between 10mm and 50mm, which ensures the safety of the flexible film passing through while maintaining a high coating capture efficiency.

[0023] Specifically, the spraying component 2 is embedded in the gap of the conveying component 3 to achieve close-range precise coating. The paint recycling mechanism 4 is suspended above the conveying line to form a combination of passive protection and active recycling. The cooperation between the safety distance and the spraying distance 32 ensures the continuous and stable conveying of the product while providing the necessary physical boundary and environmental isolation conditions for the bottom-up spraying process, thus laying the structural foundation for the realization of the refined functions of the subsequent subsystems.

[0024] For details, please refer to Figure 4 and Figure 5 In this embodiment, the paint recycling mechanism 4 includes a conveyor belt 41 and several scraper blades 42, with the scraper blades 42 positioned above the conveyor belt 41. Collection troughs 43 are provided on both sides of the conveyor belt 41, and the scraper blades 42 are located between the collection troughs 43. The conveyor belt 41 spans above the conveying assembly 3, forming an active paint capture interface. Unlike traditional passive recycling methods that rely solely on gravity settling, this embodiment uses the continuous movement of the conveyor belt 41 to forcibly transport excess paint adhering to its surface to a designated scraping station, thereby achieving the recycling of excess paint.

[0025] Furthermore, the scraper 42 is typically made of a wear-resistant and elastic material, such as polyurethane or Teflon. Its cutting edge is in close contact with the surface of the conveyor belt 41. When the conveyor belt 41 passes under the scraper 42, the coating is mechanically peeled off and slides down the guide surface of the scraper 42 into the collection troughs 43 on both sides. Based on the combination of dynamic adsorption and mechanical scraping, the problem of high-viscosity coatings easily solidifying and accumulating on the recycling surface is effectively solved, ensuring the continuous unobstructed flow of the recycling channel.

[0026] Furthermore, in practical applications, multiple sets of scraper blades 42 can be connected in series along the running direction of the conveyor belt 41 to achieve graded cleaning, prevent excessive single scraping load from causing residue, and improve the cleaning effect of the scraper blades 42 on the surface of the conveyor belt 41, thereby avoiding secondary pollution of the product surface caused by spraying residue.

[0027] Specifically, the collection trough 43 has a funnel-shaped structure, and baffle plates 431 are installed at both ends of the collection trough 43. The funnel-shaped structure utilizes the principle of gravity convergence to automatically concentrate the scraped paint towards the central discharge port, avoiding the accumulation of material in the dead corners at the bottom of the trough. The baffle plates 431 are installed vertically or obliquely at both ends of the longitudinal direction of the collection trough 43, and their height is usually higher than the upper surface of the conveyor belt 41. The core function of this design is to form a physical barrier to block paint splashes caused by the squeezing of the scraper plate 42 or the high-speed reversal of the conveyor belt 41, preventing the recovered material from overflowing and contaminating other parts of the equipment or the external environment.

[0028] Furthermore, in practical applications, a guide slope can be added to the inner side of the baffle plate 431 to guide the paint that hits the baffle plate back into the tank, thereby further improving the recovery rate.

[0029] Furthermore, the residual material output end of the collection tank 43 can be connected to the paint recycling system of the spraying equipment through a pipeline, thereby recycling the residual material and transporting it to the external feeding equipment, which can improve the utilization efficiency of the paint, reduce paint waste, and save on finished products from spraying production.

[0030] In terms of drive control, the conveyor belt 41 includes a belt 411, a drive roller 412, a driven roller 413, and a drive motor 414. The output end of the drive motor 414 is connected to the drive roller 412. The drive system of the conveyor belt 41 is completely decoupled from the drive system of the conveying assembly 3, so that the running speed and direction of the conveyor belt 41 can be adjusted independently of the product conveying speed. When the product conveying speed is slow but the amount of paint sprayed is large, the rotation speed of the conveyor belt 41 can be increased to speed up recycling and turnover, and avoid excessive local accumulation of paint. Conversely, during the product interval, the running speed of the conveyor belt 41 can be reduced or the operation of the conveyor belt 41 can be stopped to save energy and reduce consumption.

[0031] Specifically, the paint recycling mechanism 4 also includes a height adjustment mechanism 44, which is used to adjust the relative height between the conveyor belt 41 and the conveying assembly 3. The height adjustment mechanism 44 can be in various forms, such as a manual screw assembly, an electric push rod, or a pneumatic lifting cylinder. By adjusting the vertical position of the conveyor belt 41, the operator can precisely control the distance between the conveyor belt 41 and the product surface according to the thickness and surface flatness of the product to be processed, so as to adapt to the spraying requirements of products with different thicknesses and sizes. For thinner flexible films, the conveyor belt 41 can be lowered to shorten the paint scattering path and improve recycling efficiency; for thicker or irregularly shaped parts with large surface undulations, the conveyor belt 41 can be appropriately raised to reserve sufficient clearance and prevent friction damage between the top surface of the product and the recycling belt. Based on the adaptive adjustment capability, the same equipment can be compatible with the production of multiple specifications of products without replacing the core components, significantly improving the process flexibility and market competitiveness of the equipment.

[0032] Specifically, such as Figure 3 As shown, in this embodiment, the conveying component 3 includes a transmission mechanism 33 and a drive component 34. Several transmission rollers 31 are arranged inside the transmission mechanism 33. The drive component 34 drives and connects to the transmission mechanism 33. The drive component 34 serves as a power source and transmits the rotational torque synchronously to each transmission roller 31 through the transmission mechanism 33 to ensure that the products on the product placement area 6 can pass through the spraying station smoothly and at a uniform speed.

[0033] Furthermore, the specific implementation of the transmission mechanism 33 is not limited to a single structure. For example, it can be one or more combinations of gear meshing transmission, chain sprocket transmission, belt pulley transmission, universal joint transmission, or coupling transmission. In this embodiment, the transmission mechanism 33 adopts a gear transmission method, which ensures that each transmission roller 31 has sufficient structural rigidity and transmission stability to meet the requirements of orderly product conveying.

[0034] Furthermore, to accommodate the specific conveying requirements of wet-coated products, please refer to... Figure 3 The outer circumference of the drive roller 31 is provided with several circular pieces 311, and the circular pieces 311 of any two adjacent drive rollers 31 are staggered. This structural design is a key feature that distinguishes this embodiment from general conveyor lines, and it contains a dual technical mechanism. First, from the perspective of contact mechanics, the circular pieces 311 transform the "surface contact" between the traditional roller conveyor and the product into discrete "point contact" or "line contact". When the bottom surface of the product is coated with uncured wet paint, this extremely small contact area significantly reduces the adhesion force and shear damage risk of the roller surface to the coating, avoiding coating peeling or uneven thickness caused by excessive contact area.

[0035] Secondly, from the perspective of motion stability, although the discs 311 on a single drive roller 31 are spaced apart, the discs 311 on adjacent rollers are staggered in the axial direction, and these discrete support points together form a continuous "virtual support plane" in space. This virtual plane retains the advantage of reducing the contact area and effectively prevents the product from flexing or deforming due to local suspension or from lateral displacement in the conveying direction.

[0036] Furthermore, the shape of the disc 311 is not limited to a circle, but can also be an ellipse, a polygon, or other protruding structure, as long as it can reduce the contact area and provide stable support; at the same time, the pattern of the staggered distribution is not limited to a strict alternating arrangement, but can also be a non-uniform staggered arrangement designed according to the stress characteristics of the product, so as to adapt to the conveying of products with specific shapes.

[0037] Specifically, the conveying assembly 3 also includes several scraper baffles 35, which are arranged one-to-one on several drive rollers 31. The scraper baffles 35 are usually located below the drive rollers 31 on the side closer to the transmission mechanism 33, and are used to scrape off the excess paint adhering to the drive rollers 31. During the spraying process, some overspray paint may adhere to the surface of the drive rollers 31 and rotate with the rollers. Based on the physical barrier provided by the scraper baffles 35, the excess paint on the drive rollers 31 is scraped off and eventually falls into the recycling tank below, avoiding the residue on the drive rollers 31 from causing damage to the transmission components, and also avoiding the residual paint from interfering with the spraying effect of subsequent products.

[0038] Furthermore, the scraper baffle 35 is a stationary baffle fixed on the side plate of the frame and does not rotate with the roller. It uses the small gap between itself and the end face of the roller to block the residual spray coating material. The scraper baffle 35 and the transmission roller 31 form an acute angle, which can guide the scraped spray coating material to ensure that it falls accurately into the residual material recycling device.

[0039] Specifically, in this embodiment, please refer to Figure 6 and Figure 7 The spraying assembly 2 includes a spraying cabinet 21, several spray guns 22 disposed inside the spraying cabinet 21, and a guide channel 23 disposed above the spray guns 22. The guide channel 23 is a frame structure, and the upper end of the frame structure is set as a conical guide structure. The spraying cabinet 21 forms a relatively closed spraying cavity, which is used to isolate the external environmental airflow from interfering with the spraying atomization field, and at the same time prevent paint mist from overflowing disorderly and polluting the workshop environment.

[0040] Furthermore, the guide channel 23 is located directly above the spray gun 22, with a larger lower port diameter to cover the spray range of the spray gun 22, and a gradually narrowing upper port diameter to form a conical guide structure. This geometric design is not merely for aesthetic purposes, but is based on the principle of fluid dynamics: when the spray gun 22 sprays paint from bottom to top, the inner wall of the cone can physically constrain and guide the diverging paint mist, forcing paint particles to concentrate and move upward along the axial direction, reducing the diffusion loss of paint mist in the horizontal direction; at the same time, the conical structure can also effectively collect paint droplets that bounce back from impacting the bottom surface of the product, allowing them to flow back along the slope to the lower recovery area, avoiding the rebound paint mist from re-adhering to the product surface and causing orange peel or particle defects.

[0041] In practical applications, the guide channel can also be parabolic, funnel-shaped, or multi-step, etc., which can gather airflow and paint mist, and can meet the function of guiding the spraying direction and reducing scattering.

[0042] To achieve dynamic adjustment of the spraying position and ease of maintenance, the spraying assembly 2 also includes a lifting mechanism 24. The lifting mechanism 24 includes a lifting drive component 241 and a connecting bracket 242. The lifting drive component 241 is located on the outer wall of the spraying cabinet 21 and drives the connecting bracket 242. The guide channel 23 is located on the connecting bracket 242. The top of the guide channel 23 is driven by the lifting mechanism 24 to rise into the spraying distance 32 of the conveying assembly 3, or the top of the guide channel 23 is driven by the lifting mechanism 24 to descend below the conveying assembly 3. The lifting mechanism 24 can adjust the position of the spraying assembly 2 in different states. In the working position, the lifting drive component 241 pushes the connecting bracket 242 upward, so that the top of the guide channel 23 precisely extends into the spraying distance 32, as close as possible to the bottom surface of the product placement area 6, thereby shortening the spraying distance and improving the paint utilization rate and coating uniformity.

[0043] In the maintenance position, the lifting drive 241 lowers the guide trough 23 to below the conveying assembly 3. At this time, the guide trough 23 is completely separated from the product conveying channel, which not only provides the operator with sufficient operating space for cleaning, maintenance or replacement of nozzles, but more importantly, avoids accidental contamination of the products on the conveying line above during maintenance operations.

[0044] Furthermore, the lifting drive component 241 can be in the form of a cylinder, hydraulic cylinder, electric lead screw module, or gear and rack mechanism, etc., which can be flexibly selected by those skilled in the art according to the load size and accuracy requirements.

[0045] Specifically, the spraying assembly 2 also includes a gate opening and closing mechanism 25, which includes an actuating rod 251, a door plate 252, and a gate drive component 253. The actuating rod 251 is rotatably connected to the inside of the spraying cabinet 21, and the door plate 252 is mounted on the actuating rod 251 and located between the spray gun 22 and the guide channel 23. The gate drive component 253 is disposed on the outer wall of the spraying cabinet 21 and drives the actuating rod 251. The gate opening and closing mechanism 25 is used to adjust the spraying speed of the spraying assembly 2. In the coating dispensing state, since the coating material of the spraying equipment is a viscous fluid material, the feeding equipment of the spraying equipment needs to maintain the conveying motion of the coating material to ensure that the coating material remains in a fluid state and to prevent the coating material from solidifying in the conveying pipeline or the spray nozzle of the spraying equipment when the conveying motion stops. By setting the gate opening and closing mechanism 25, the gate plate 252 of the gate opening and closing mechanism 25 can physically block the coating material of the spray gun 22 in the product replacement or standby state of the spraying equipment, so as to prevent the coating material from being directly sprayed onto the coating material recovery mechanism 4.

[0046] Furthermore, when the equipment is in standby, product replacement, or malfunction shutdown state, the gate drive component 253 drives the actuating rod 251 to rotate, causing the gate plate 252 to move directly above the nozzle of the spray gun 22, forming a physical shielding barrier that can completely isolate the spray gun 22 from the guide channel 23 and the conveying area above it.

[0047] Furthermore, the door panel 252 should be made of solvent-resistant and easy-to-clean materials, such as stainless steel or a metal plate coated with Teflon.

[0048] Furthermore, the gate drive component 253 can be a telescopic cylinder, telescopic motor, or other drive components, and is connected to the actuating rod 251 via a connector, so that the gate drive component 253 can drive the actuating rod 251 to rotate within a preset angle range to satisfy the flipping and opening operation of the gate panel 252, thereby improving the accuracy of the gate opening and closing mechanism 25.

[0049] Specifically, regarding paint recycling, a return trough 26 is installed below the spray booth 21 to collect excess paint from the spraying assembly 2. The return trough 26 is connected to the collection trough 43 via a pipeline, and the return trough 26 is also connected to an external feeding device. The local recycling within the spraying assembly 2 and the overall recycling by the paint recycling mechanism 4 form a unified closed-loop system. Specifically, whether it is excess paint falling directly to the bottom of the booth during the spraying process or rebound paint flowing back through the inner wall of the guide trough 23, it will eventually collect in the return trough 26. The return trough 26 is connected to the collection trough 43 located above the conveying assembly 3 via a pipeline, so that the recycled paint scraped off the conveyor belt 41 can also flow into the same path. This confluence design simplifies the piping layout of the equipment, requiring only one pumping and filtration system to uniformly transport recycled paint from all sources back to the external feeding device for reuse.

[0050] Furthermore, the return trough 26 is connected to an external feeding device based on the pump body and the return pipeline, and a liquid level sensor is installed inside the return trough 26. Based on the sensor, the content of the sprayed paint inside the return trough 26 is detected. When the liquid level sensor is triggered, the remaining sprayed paint is transported to the feeding device through the pump body and the return pipeline to realize the recycling of the remaining sprayed paint.

[0051] For details, please refer to Figure 8 and Figure 9 In this embodiment, a pulley block 5 is provided on the frame 1, and the spraying component 2 is installed in the frame 1 based on the pulley block 5. The pulley block 5 constitutes a heavy-duty linear sliding system, which enables the spraying component 2, which was originally fixed inside the frame 1, to have the freedom to move horizontally relative to the frame 1. This design transforms the traditional "in-situ fixed" installation into a "pull-out" modular installation, expanding the maintenance and operation space of the equipment.

[0052] Furthermore, with the support and guidance of the pulley block 5, the entire spraying assembly 2 can be smoothly pulled out to the outside of the frame 1 like a drawer, so that all maintenance surfaces are fully exposed, thereby achieving cleaning without dead angles and convenient maintenance, significantly shortening downtime for maintenance and improving operational safety.

[0053] Furthermore, the cleaning and maintenance of the spraying component 2 can be performed manually by the operator pulling it out for cleaning and maintenance, or it can be performed by electric, pneumatic, or lead screw power mechanisms to push and pull it out, which can effectively improve the convenience of cleaning and maintenance of the spraying component 2.

[0054] Specifically, the pulley assembly 5 includes a guide rail 51 installed inside the frame 1, a fixed pulley 52 installed at one end of the guide rail 51, and a double pulley assembly 53 slidably fitted on the guide rail 51; a mounting frame 54 is installed at the bottom of the spraying assembly 2, the fixed pulley 52 is slidably connected to the mounting frame 54, and the double pulley assembly 53 is installed at one end of the mounting frame 54. The two pulleys of the double pulley assembly 53 are slidably fitted on the upper and lower ends of the guide rail 51, respectively. This mechanical fit ensures the stability and load-bearing capacity of the pulling process. The fixed pulley 52 is fixed to one end of the guide rail 51, and the fixed pulley 52 is slidably connected to the mounting frame 54 to ensure that the mounting frame 54 can move on the fixed pulley 52.

[0055] The guide rail 51 extends along the depth of the frame 1, providing precise linear trajectory constraints for the entry and exit of the spraying assembly 2, preventing it from deviating or jamming during movement. The fixed pulley 52 is fixed at the front end or a specific position of the guide rail 51, mainly serving to support the bottom of the mounting frame 54 and reduce sliding friction; the double pulley assembly 53 is installed at the end of the mounting frame 54, typically consisting of two pulleys arranged vertically to form a covering clamp on the guide rail 51, effectively resisting the overturning moment generated by the shift of the center of gravity of the spraying assembly 2.

[0056] When the operator pulls the spraying assembly 2 outward, the mounting bracket 54 drives the double pulley group 53 to roll forward along the guide rail 51. At the same time, the fixed pulley 52 serves as an auxiliary fulcrum to share the load, so that even a heavy spraying cabinet fully loaded with paint and metal components can be easily pushed and pulled by a single person.

[0057] Furthermore, the fixed pulley 52 can also limit the movement of the double pulley group 53, which can prevent the spraying component 2 from accidentally derailing when pulled to its limit position.

[0058] Furthermore, the guide rail 51 is provided with a limiting groove corresponding to the position of the fixed pulley 52. ​​After being pushed back to the working position, the spraying component 2 can be limited and fixed by inserting a limiting bolt into the limiting groove to prevent the spraying component 2 from moving and to ensure the accuracy of the spraying position.

[0059] Furthermore, when the spraying component 2 needs to be cleaned and maintained, the lifting mechanism 24 of the spraying component 2 drives the guide channel 23 to descend, so that the guide channel 23 is located below the conveying component 3, thus avoiding motion interference when the spraying component 2 is pulled outward.

[0060] In this embodiment, the timing coordination mechanism of the conveyor belt 41 and the scraper 42 in the paint recycling mechanism 4 during the paint recycling process will be further explained, as well as the matching relationship between various process parameters. The core of this embodiment is to achieve stable adhesion and directional conveying of the paint on the bottom surface of the conveyor belt 41 by reasonably controlling the timing match between the adhesion characteristics of the paint and the operating parameters of the conveyor belt 41, thereby avoiding paint dripping onto the top surface of the product under the action of gravity and causing pollution.

[0061] Specifically, in this embodiment, the specific gravity (density corresponding to Baumé) of the coating is 1.5-1.6 g / cm³. Coatings within this density range have high solid content and viscosity characteristics, and can form a coating layer with a certain adhesion strength on the bottom surface of the conveyor belt 41 after spraying.

[0062] Regarding spraying parameters, the distance between the spray gun 22 and the product is set to 250-400mm. This distance range ensures that the paint, after being atomized by the spray gun 22, has sufficient space to spread, forming a uniform coating distribution on the bottom surface of the product and the bottom surface of the conveyor belt 41. It also avoids excessive paint scattering and reduced recycling efficiency due to excessive distance. The paint application rate is controlled at 30-50g / ㎡. This range satisfies the functional requirements of product surface coating while ensuring that the paint layer thickness adhering to the bottom surface of the conveyor belt 41 remains within a controllable range during the gaps between multiple product transports, preventing dripping due to excessive local paint thickness causing gravity to exceed adhesion.

[0063] During the spraying process, after some paint is sprayed onto the bottom surface of the conveyor belt 41, it remains stably adhered to the bottom surface of the conveyor belt 41 for a preset period of 15-25 seconds due to its own adhesive force, preventing it from falling off due to gravity. Based on this characteristic, the conveyor belt 41 is started to rotate within 15-25 seconds after spraying is completed. This allows the paint adhering to the bottom surface of the conveyor belt 41 to be conveyed to the scraping station at the top, where the scraper plate 42 performs mechanical peeling. Since the paint remains within its effective adhesion period throughout the entire conveying process, there will be no situation where paint falls off the bottom surface of the conveyor belt 41 and drips onto the top surface of the product.

[0064] The linear speed of conveyor belt 41 needs to be calculated based on the adhesion shelf life of the paint and the total length of conveyor belt 41 to ensure that the paint can be transported from the bottom spraying area to the top scraping station within the adhesion shelf life. Taking a conveyor belt length of 2-3m as an example, the paint needs to move along the bottom surface of conveyor belt 41 from the spraying position to the scraping position within the adhesion shelf life. Taking a transport time of 20s as the calculation benchmark, the theoretical linear speed of conveyor belt 41 is calculated as follows: when the length of conveyor belt 41 is 2000mm, 2000mm ÷ 20s = 100mm / s; when the length of conveyor belt 41 is 3000mm, 3000mm ÷ 20s = 150mm / s. Therefore, the theoretical linear speed V of conveyor belt 41 is 100-150mm / s, which is equivalent to 6-9m / min.

[0065] However, in actual production environments, temperature changes affect the viscosity and rheological properties of the coating, humidity fluctuations alter the adhesion between the coating and the surface of the conveyor belt 41, and airflow generated during spraying also interferes with the coating's adhesion stability. Considering the combined effects of these factors such as temperature, humidity, and wind resistance, a safety factor of 2 is introduced, meaning the belt linear speed V is set to 12-18 m / min. Within this speed range, the drive system of the conveyor belt 41 has sufficient power margin, ensuring the coating can be transported throughout its effective adhesion period even under adverse environmental conditions. This effectively prevents the coating from detaching and dripping onto the product surface during transport due to decreased adhesion caused by environmental factors.

[0066] By coordinating the aforementioned process parameters such as paint specific gravity, spraying distance, paint amount per square meter, conveyor belt length, and operating speed, this embodiment achieves a complete recycling cycle, including stable paint adhesion to the bottom surface of conveyor belt 41, reliable conveying within the adhesion validity period, and thorough peeling at the scraping station. This anti-drip mechanism, based on precise matching of the paint adhesion time window and the conveyor belt operating speed, fundamentally solves the technical problem of excessive paint potentially contaminating the top surface of the product in bottom-up spraying processes, ensuring the cleanliness and yield of the product's top surface during continuous spraying operations.

[0067] This invention provides a spraying device that, by constructing a vertically stacked functional module layout within the frame, utilizes a conveyor assembly to carry the product and reserves a spraying gap, enabling the spraying assembly to accurately coat the product from bottom to top or from top to bottom. Simultaneously, a paint recovery mechanism is set above the conveyor assembly while maintaining a safe distance, which not only avoids interference and collision between the recovery mechanism and the moving product, but also ensures that excess paint can be effectively captured, thereby achieving controllable and adjustable coating thickness and continuous and stable production process.

[0068] Furthermore, the above provides a detailed description of the spraying equipment provided in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A spraying device, characterized in that, The spraying equipment includes: a frame, a spraying assembly disposed within the frame, a conveying assembly disposed above the spraying assembly, and a paint recovery mechanism disposed above the conveying assembly; The conveying assembly includes several drive rollers, and at least one spraying gap is provided between the several drive rollers. The spraying end of the spraying assembly is located within the spraying gap. The top surface of the conveying component is the product placement area, and the spraying direction of the spraying component is towards the product placement area. When the product is located in the product placement area, a safe distance is provided between the paint recycling mechanism and the product.

2. The spraying equipment as described in claim 1, characterized in that, The paint recycling mechanism includes: a conveyor belt and several scraper blades, the scraper blades being positioned above the conveyor belt; The conveyor belt is provided with material collection troughs on both sides, and the scraper is located between the two material collection troughs.

3. The spraying equipment as described in claim 2, characterized in that, The paint recycling mechanism also includes a height adjustment mechanism for adjusting the relative height between the conveyor belt and the conveying assembly.

4. The spraying equipment as described in claim 1, characterized in that, The conveying assembly includes a transmission mechanism and a driving component, with a plurality of transmission rollers disposed within the transmission mechanism, and the driving component drivingly connected to the transmission mechanism; The outer circumference of the drive roller is provided with a number of circular pieces, and the circular pieces of any two adjacent drive rollers are staggered.

5. The spraying equipment as described in claim 4, characterized in that, The conveying assembly also includes several scraper baffles, which are arranged one-to-one on several drive rollers.

6. The spraying equipment as described in claim 1, characterized in that, The spraying assembly includes: a spraying cabinet, several spray guns disposed inside the spraying cabinet, and a guide trough disposed above the spray guns; The flow channel is a frame structure, and the upper end of the frame structure is set as a conical flow guide structure.

7. The spraying equipment as described in claim 6, characterized in that, The spraying assembly also includes a lifting mechanism, which includes a lifting drive and a connecting bracket. The lifting drive is disposed on the outer wall of the spraying cabinet and drives the connecting bracket. The guide channel is disposed on the connecting bracket. The top of the guide channel is driven to rise within the spraying spacing of the conveying assembly by the lifting mechanism, or the top of the guide channel is driven to descend below the conveying assembly by the lifting mechanism.

8. The spraying equipment as described in claim 6, characterized in that, The spraying assembly also includes a gate opening and closing mechanism, which includes: an actuating rod, a gate plate, and a gate driving component; The actuating lever is rotatably connected inside the spray booth, the door panel is mounted on the actuating lever, and the door panel is located between the spray gun and the guide channel; The gate drive unit is located on the outer wall of the spray booth, and the gate drive unit is connected to the actuating rod.

9. The spraying equipment as described in claim 6, characterized in that, A return trough is provided below the spraying cabinet, which is used to collect the spraying residue from the spraying components.

10. The spraying equipment as described in claim 1, characterized in that, The frame is provided with a pulley assembly, and the spraying assembly is installed in the frame based on the pulley assembly. The pulley assembly includes: a guide rail provided in the frame, a fixed pulley provided at one end of the guide rail, and a double pulley assembly that is slidably engaged on the guide rail. The bottom of the spraying assembly is provided with a mounting bracket, the fixed pulley is slidably connected to the mounting bracket, and the double pulley group is provided at one end of the mounting bracket.

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