An automatic spraying and curing production line for blackboard surface coating

Abstract

The application discloses a blackboard surface coating automatic spraying and curing production line, and belongs to the technical field of blackboard surface coating processing devices. The production line comprises a spraying and curing mechanism and a waste gas treatment mechanism. The spraying and curing mechanism comprises a conveying line, a liquid storage tank, a first pump body, an extension pipe and an atomizing spray head arranged above the conveying line. A cylinder drives the movable end of the extension pipe and the atomizing spray head to lift or lower through a push rod and a cross beam, so as to adjust the spraying height. The push rod drives a moving rod to slide in the fixed end of the extension pipe through a swing rod, and a flow guide groove in the moving rod is communicated with the extension pipe, so as to keep the coating liquid conveying stable during the lifting of the spray head. A rotating blade is arranged in the movable end of the extension pipe, and the rotating blade is driven to rotate when the coating liquid flows, and drives a hot air gun to act through a first rotating shaft, a first bevel gear, a second bevel gear and a rotating ring, so as to realize the linkage of spraying and hot air curing. The application can improve the uniformity of blackboard coating spraying, the curing efficiency and the waste gas treatment effect.

Description

Technical Field

[0001] This invention belongs to the technical field of blackboard processing equipment, specifically relating to an automatic blackboard surface coating spraying and curing production line. Background Technology

[0002] Blackboard surface coating spraying and curing refers to an industrial coating process that uses galvanized steel sheets as workpieces and employs high-pressure air spray guns or automatic reciprocating spraying machines to evenly atomize and spray special epoxy primer and matte acrylic blackboard topcoat onto the board surface. After drying and curing, a composite paint film with anti-rust, matte, and wear-resistant writing functions is formed. It is further cured with heating devices or ultraviolet irradiation equipment to specially produce teaching blackboard surfaces that can be written on with chalk and magnetically attached.

[0003] Existing automatic coating and curing equipment for blackboard surfaces is often designed independently, with the coating being sprayed first and then cured. This results in low work efficiency. For blackboards of different sizes, the amount of coating and the height of the spray points need to be adjusted adaptively through multiple transmission mechanisms and systems, making the design overly complex and lacking in coordination. Furthermore, during the automatic coating process, the epoxy anti-rust primer generates benzene compounds and organic waste gas during atomization. If this is not effectively treated, it will affect the working environment and be detrimental to the health of personnel. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic spraying and curing production line for blackboard surface coating, which at least solves the technical problems of insufficient liquid supply, spraying pressure fluctuation, local dripping, or unstable atomization caused by the change in position of the liquid supply path as the nozzle rises and falls during the adjustment of the nozzle height in existing blackboard surface coating spraying equipment.

[0005] In a further embodiment, the present invention also solves the problem of the spraying position and the hot air curing position being difficult to synchronize by driving the hot air gun to generate a linkage curing action through the flow of coating liquid; and solves the problem of the exhaust gas at the source of spraying curing being difficult to collect by means of an absorption hood and a corrugated hose that move synchronously with the movable end of the telescopic tube.

[0006] The key improvement of this invention lies not in separately setting up a spraying device, a hot air device, or an exhaust gas treatment device, but in making the lifting and lowering adjustment of the atomizing nozzle, the coating liquid supply channel, the hot air curing position, and the exhaust gas suction position form a coordinated relationship under the same motion reference. Specifically, when the cylinder drives the push rod to lift and lower, the push rod drives the movable end of the telescopic tube and the atomizing nozzle to lift and lower synchronously through the crossbeam, and on the other hand, it drives the moving rod to slide in the movable hole of the fixed end of the telescopic tube through the swing rod, so that the guide groove maintains continuous communication with the inner cavity of the telescopic tube during the lifting and lowering of the atomizing nozzle; at the same time, when the coating liquid flows through the movable end of the telescopic tube, it drives the rotating blade to rotate, and drives the hot air gun to produce a linkage curing action corresponding to the spraying area through the first rotating shaft, the first bevel gear, the second bevel gear, and the rotating ring; the absorption cover is fixed to the movable end of the telescopic tube, so that the exhaust gas suction position moves synchronously with the atomizing nozzle and the hot air gun. Therefore, spraying, liquid supply, curing, and exhaust gas collection are not independent parallel functional modules, but rather form a mechanically coordinated chain with matching relative positions and action sequences near the moving end of the same telescopic tube. This reduces problems such as liquid supply fluctuations, curing position lag, and deviation of the pollution source suction position caused by nozzle height adjustment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An automated blackboard surface coating spraying and curing production line includes: A spray curing mechanism includes a conveyor line, a frame on the conveyor line is equipped with a liquid storage tank connected to a first pump body, a telescopic pipe penetrating the frame is connected to the bottom of the first pump body, an atomizing nozzle adapted to the telescopic pipe is installed at the bottom of the telescopic pipe, and a cylinder is positioned on the frame. The piston rod on the cylinder extends to the push rod at its bottom. The push rod and the movable end on the telescopic tube are fixedly connected by a crossbeam. One end of the outer wall of the push rod is connected to a moving rod by a swing rod. The outer wall of the moving rod is slidably connected to the movable hole at the fixed end of the telescopic tube. A guide groove is provided on the moving rod, penetrating the interior of the moving rod and communicating with the telescopic tube.

[0008] Furthermore, a first rotating shaft is installed on one side of the movable end of the telescopic tube. One end of the first rotating shaft is connected to a rotating blade placed inside the telescopic tube, and the other end is connected to a first bevel gear placed on the inner wall of the housing. The outer wall of the housing is fixedly installed on the outer wall of the movable end of the telescopic tube by locking with a positioning pin. The outer wall of the first bevel gear meshes with a second bevel gear fixed on the rotating ring. A rotating groove connected to the rotating ring is opened at the bottom of the inner wall of the housing.

[0009] Furthermore, the lower end of the rotating ring passes through the rotating groove and is connected to the rotating rod, and one end of the rotating rod is detachably connected to a hot air gun. The hot air gun is located downstream of the atomizing nozzle along the conveyor line and is used to simultaneously cure the wet film area formed by the atomizing nozzle with hot air. The rotating ring is provided with an arc-shaped limiting groove, which allows the hot air gun to swing back and forth between the first limit angle and the second limit angle. The power supply wire of the hot air gun is arranged through a flexible drag chain. The telescopic tube and the inner wall of the housing together form an active cavity for the rotating ring to move. The inner wall of the telescopic tube is integrally formed with a trapezoidal block placed above the rotating blade. The two ends of the swing rod are rotatably connected to the push rod and the moving rod, respectively.

[0010] Furthermore, the push rod and the moving rod are arranged vertically, and the movable end of the telescopic tube is provided with a bearing connected to the first rotating shaft. A sealing gasket connected to the telescopic tube is installed on the outer wall of the bearing.

[0011] Furthermore, it also includes a waste gas treatment mechanism, which includes a treatment box. One end of the treatment box is connected to a corrugated hose via a second pump body. The corrugated hose is installed in an absorption hood outside the hot air gun by a threaded connection. The absorption hood is installed on the movable end of the telescopic tube by bolts. A drive motor is fixedly installed on the outer wall of the treatment box. The output shaft of the drive motor is connected to a second rotating shaft placed on the inner wall of the treatment box. A first activated carbon plate arranged in a ring is distributed on the second rotating shaft.

[0012] Furthermore, the outer wall of the first activated carbon plate is integrally formed with an arc-shaped portion, which constitutes a cam portion that rotates with the first activated carbon plate. The first lifting plate and the second lifting plate slide along the first guide groove and the second guide groove in the processing box, respectively. When the cam portion rotates, it sequentially pushes against the first lifting plate and the second lifting plate to generate a preset directional displacement. U-shaped plates are fixedly installed on both sides of the top end of the first lifting plate. The lower end of the pull rod is provided with a limiting flange, which is located in the opening of the U-shaped plate. When the first lifting plate moves upward, the U-shaped plate pushes against the limiting flange and drives the pull rod to move upward. When the lowering plate returns to its original position, the sealing plate, under the action of the first spring, drives the pull rod to return to its original position. The top of the pull rod passes through the opening on the panel and extends to the sealing plate. One end of the sealing plate is rotatably connected to the top of the panel via a hinge. The panel and the top of the inner wall of the processing box are connected by the first spring. The first lifting plate and the inner wall of the processing box are connected by the second spring. The processing box is equipped with a pressure detection device and a pressure relief bypass. The pressure detection device is used to detect the pressure inside the processing box, and the pressure relief bypass is used to conduct when the pressure inside the processing box exceeds a preset value. When the second pump is running, the processing box maintains a negative pressure or slightly negative pressure state.

[0013] Furthermore, a sleeve is fixedly installed on the outer wall of the second lifting plate by a bracket, and a top rod is connected to the bottom of the sleeve by a snap-fit ​​installation. The bottom of the top rod moves through the through hole in the second activated carbon plate, and the size of the top rod is adapted to the through hole in the second activated carbon plate.

[0014] Furthermore, the second activated carbon plate is installed on the inner wall of the processing box by horizontal embedding. The second lifting plate is connected to the inner wall of the processing box by a third spring. An air inlet connected to the second pump body is provided below the second activated carbon plate. An air outlet placed on the inner wall of the processing box is provided above the sealing plate. The conveyor line is installed on the frame and extends along the length of the frame to carry and convey the blackboard.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) In this invention, the blackboard is continuously carried and transported by a conveyor line, and a spraying structure consisting of a liquid storage tank, a first pump body, a telescopic tube and an atomizing nozzle is set above the conveyor line. The coating liquid can be transported to the telescopic tube by the first pump body and then sprayed out by the atomizing nozzle, thereby realizing continuous automatic spraying of the coating on the blackboard surface. At the same time, the piston rod of the cylinder drives the push rod to move. The push rod drives the movable end of the telescopic tube and the atomizing nozzle to rise and fall synchronously through the crossbeam. This allows the atomizing nozzle to adjust its height according to the distance between the blackboard surface and the nozzle, which helps to maintain a stable spraying distance, reduce spraying deviation caused by manual adjustment of the nozzle position, and improve the uniformity of coating coverage and the continuity of spraying on the production line.

[0016] (2) In this invention, during the lifting and lowering process of the push rod with the cylinder, the moving rod is driven by the swing rod to slide in the movable hole at the fixed end of the telescopic tube. The guide groove inside the moving rod is connected to the telescopic tube, so that the nozzle lifting and lowering adjustment and the coating liquid guide structure form a linkage relationship. When the movable end of the telescopic tube moves, the moving rod can synchronously change the connection position between the guide groove and the telescopic tube, thereby maintaining the continuity and stability of the coating liquid flow path during the nozzle height adjustment process, reducing the problems of poor liquid supply, local dripping or uneven coating liquid delivery caused by the displacement of the telescopic tube during the spraying process, and making the coordination between the spraying action and the liquid supply action more coordinated.

[0017] (3) In this invention, a rotating blade is provided inside the movable end of the telescopic tube. When the coating liquid flows inside the telescopic tube, it can drive the rotating blade to rotate. The rotating blade drives the first bevel gear to rotate through the first rotating shaft. After the first bevel gear meshes with the second bevel gear, it drives the rotating ring to move. Then, through the rotating rod, it drives the hot air gun to generate a linkage curing action with the spraying area. This structure uses the flow process of the coating liquid itself as the trigger source for the linkage movement of the hot air gun, so that the spraying and hot air curing are coordinated near the movable end of the same telescopic tube. This reduces the problem of delayed curing position caused by setting a fixed curing station separately after spraying. It is beneficial to improve the heat uniformity of the coating on the blackboard surface, accelerate the surface drying and curing speed of the coating, and reduce the situation of coating sagging, local accumulation and insufficient curing. The trapezoidal block inside the telescopic tube can guide the flow direction of the coating liquid, so that the liquid flow acts more concentrated on the rotating blade, improving the stability of the rotating blade, bevel gear set and rotating ring transmission.

[0018] (4) The present invention also includes a waste gas treatment mechanism. The second pump body is connected to the absorption hood installed outside the hot air gun through a corrugated hose, and the absorption hood is fixed on the movable end of the telescopic tube, so that the waste gas absorption position can move synchronously with the spraying and hot air curing positions, thereby timely extracting waste gas, odor and suspended coating particles near the source of spraying and curing, reducing their diffusion to the production environment. The waste gas entering the treatment box is first filtered by the second activated carbon plate, and then comes into contact with the first activated carbon plate rotated by the drive motor, forming a multi-stage adsorption and purification path. The arc-shaped part of the outer wall of the first activated carbon plate abuts against the first lifting plate and the second lifting plate respectively during the rotation, causing periodic disturbance of the airflow in the treatment box, and through The first lifting plate, U-shaped plate, pull rod, sealing plate, and spring work together to achieve periodic throttling adjustment at the panel opening, causing periodic changes in the exhaust gas flow rate and flow path within the treatment chamber, which helps increase the contact opportunity between the exhaust gas and the first activated carbon plate. The sealing plate is used for intermittent blocking and throttling, rather than completely sealing the airflow channel of the treatment chamber. When the sealing plate is in the blocking position, the treatment chamber still maintains a safe negative pressure through the limiting gap or bypass gap to avoid abnormal pressure inside the treatment chamber. The second lifting plate drives the top rod to periodically pass through the through hole of the second activated carbon plate, which can unclog the through hole, reduce the risk of particulate matter clogging the filter channel, and ensure the long-term ventilation stability and maintenance convenience of the exhaust gas treatment mechanism.

[0019] (5) In this invention, the waste gas generated during the spraying and hot air pre-drying processes enters the treatment box through the absorption hood. It first undergoes preliminary filtration and adsorption through the second activated carbon plate, and then enters the area where the first activated carbon plate is located for further adsorption treatment. The drive motor drives the first activated carbon plate, which is distributed in a ring, to rotate through the second rotating shaft, causing the waste gas to turbulent in the treatment box and increasing the contact opportunity between the waste gas and the first activated carbon plate, thereby improving the adequacy of the waste gas adsorption treatment. The arc-shaped part of the outer wall of the first activated carbon plate periodically abuts against the first lifting plate and the second lifting plate during the rotation. The first lifting plate drives the sealing plate to rotate around the hinge through the U-shaped plate and the pull rod to open or block the opening on the panel; the second lifting plate drives the top rod to reciprocate through the sleeve, so that the top rod periodically extends into or retracts from the through hole on the second activated carbon plate, pushing and cleaning the particles attached to the through hole, reducing the risk of blockage of the through hole of the second activated carbon plate. The outer diameter of the push rod is smaller than the diameter of the through hole of the second activated carbon plate, and an annular gap is maintained between them for gas to pass through. When the push rod is periodically inserted into or withdrawn from the through hole under the action of the second lifting plate, it only pushes and cleans the particles attached to the through hole, without blocking the through hole for a long time. This reduces the risk of particle blockage while maintaining the cross-sectional area of ​​the second activated carbon plate for ventilation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an automatic spraying and curing production line for blackboard surface coating according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of an automatic spraying and curing production line for blackboard surface coating according to the present invention. Figure 2 ; Figure 3 This is the present invention. Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the interior of the absorption cover of the present invention; Figure 5 This is a schematic diagram of the interior of the movable end of the telescopic tube of the present invention; Figure 6 This is a schematic diagram of the meshing transmission of the first bevel gear and the second bevel gear of the present invention; Figure 7 This is a schematic diagram of the interior of the processing box of the present invention. Figure 1 ; Figure 8This is a schematic diagram of the interior of the processing box of the present invention. Figure 2 ; Figure 9 This is the present invention. Figure 8 Enlarged view of point B.

[0022] Reference numerals: 1. Spray curing mechanism; 2. Conveyor line; 3. First pump body; 4. Liquid storage tank; 5. Telescopic pipe; 6. Atomizing nozzle; 7. Cylinder; 8. Push rod; 9. Crossbeam; 10. Swing rod; 11. Moving rod; 12. Guide channel; 13. First rotating shaft; 14. Rotating blade; 15. Housing; 16. First bevel gear; 17. Rotating ring; 18. Second bevel gear; 19. Rotating rod; 20. Hot air gun; 21. Trapezoidal block; 22. Exhaust gas treatment mechanism; 3. Processing box; 24. Second pump body; 25. Corrugated hose; 26. Absorption hood; 27. Drive motor; 28. Second rotating shaft; 29. ​​First activated carbon plate; 30. Arc-shaped part; 31. First lifting plate; 32. Second lifting plate; 33. U-shaped plate; 34. Pull rod; 35. Panel; 36. Opening; 37. Sealing plate; 38. Hinge; 39. First spring; 40. Second spring; 41. Sleeve; 42. Top rod; 43. Second activated carbon plate; 44. Third spring. Detailed Implementation

[0023] 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.

[0024] Reference manual attached Figure 1 -Appendix Figure 9 As shown, the present invention discloses an automatic coating spraying and curing production line for blackboard surfaces, including a coating and curing mechanism 1 and an exhaust gas treatment mechanism 22. The coating and curing mechanism 1 is used to spray coatings and perform subsequent curing treatment on the surface of the blackboard to be processed, and the exhaust gas treatment mechanism 22 is used to collect and purify the volatile gases generated during the coating and curing process.

[0025] The spraying and curing mechanism 1 includes a conveyor line 2, which is mounted on the production frame and extends along the length of the frame. The conveyor line 2 carries and transports the blackboard to be processed, allowing the blackboard to pass sequentially through the spraying area and the curing area. A liquid storage tank 4 is fixedly installed on the frame above the conveyor line 2. The liquid storage tank 4 stores the coating liquid to be sprayed and is connected to a first pump body 3, which pumps the coating liquid from the liquid storage tank 4 to the spraying end.

[0026] The bottom of the first pump body 3 is connected to a telescopic tube 5, which is installed through the production frame. The telescopic tube 5 includes a fixed end and a movable end, and the movable end can move axially relative to the fixed end. A matching atomizing nozzle 6 is installed at the bottom of the telescopic tube 5. After the coating liquid is delivered into the telescopic tube 5 by the first pump body 3, it is sprayed out by the atomizing nozzle 6 to form a uniform spray covering the blackboard surface.

[0027] A cylinder 7 is fixedly mounted on the production frame. The lower end of the piston rod of the cylinder 7 extends to a push rod 8. The push rod 8 is fixedly connected to the movable end of the telescopic tube 5 via a crossbeam 9. When the cylinder 7 works, the piston rod drives the push rod 8 to move up and down. The push rod 8 drives the movable end of the telescopic tube 5 to move synchronously via the crossbeam 9, so that the atomizing nozzle 6 installed at the bottom of the telescopic tube 5 can be adjusted in position according to the blackboard conveying height and spraying requirements, thereby maintaining a stable spraying distance between the atomizing nozzle 6 and the blackboard surface.

[0028] One end of the outer wall of the push rod 8 is connected to the moving rod 11 via a swing rod 10. Both ends of the swing rod 10 are rotatably connected to the push rod 8 and the moving rod 11 respectively, allowing the push rod 8 to move up and down, thus driving the moving rod 11 to produce a corresponding displacement. The moving rod 11 is slidably connected to the movable hole at the fixed end of the telescopic tube 5. A through-flow channel 12 is formed inside the moving rod 11, communicating with the interior of the telescopic tube 5. During the movement of the movable end of the telescopic tube 5, the push rod 8 drives the moving rod 11 to move along the movable hole via the swing rod 10, establishing a corresponding communication between the channel 12 and the interior of the telescopic tube 5. This ensures that the coating liquid delivery channel remains continuous during the telescopic tube 5's expansion and contraction adjustment, preventing unstable liquid supply due to changes in the length of the telescopic tube 5.

[0029] Specifically, the guide groove 12 inside the moving rod 11 extends along the moving direction of the moving rod 11, and the position of the guide groove 12 corresponds to the position of the movable hole at the fixed end of the telescopic tube 5, so that when the moving rod 11 moves back and forth under the drive of the swing rod 10, the guide groove 12 can always maintain communication with the inner cavity of the telescopic tube 5 within the preset lifting stroke of the atomizing nozzle 6.

[0030] Preferably, the effective connecting length of the guide channel 12 is greater than or equal to the sum of the maximum lifting stroke of the atomizing nozzle 6 and the length of the connecting window at the fixed end of the telescopic tube 5, so that when the moving rod 11 moves to the highest or lowest position under the drive of the cylinder 7, the guide channel 12 still overlaps and connects with the inner cavity of the telescopic tube 5 at least partially. Solvent-resistant sealing rings that fit against the outer wall of the moving rod 11 are provided on both sides of the movable hole at the fixed end of the telescopic tube 5. The sealing rings are used to limit the leakage of coating liquid from the movable hole to the outside. A scraping ring can also be provided at the end of the movable hole near the outside. The scraping ring is used to scrape off the coating liquid adhering to the outer wall of the moving rod 11, reducing the liquid residue and dripping caused by the reciprocating sliding of the moving rod 11. Rounded corner transitions are provided at the inlet and outlet ends of the guide channel 12 to reduce the local pressure surge when the coating liquid enters the guide channel 12. Through the above configuration, the guide channel 12 is not a simple through-hole structure, but a sliding guide structure that maintains a continuous coating liquid channel during the lifting and lowering adjustment of the atomizing nozzle 6, thereby improving the stability of the spraying pressure and the uniformity of atomization.

[0031] Therefore, when the cylinder 7 drives the atomizing nozzle 6 to rise and fall, the coating liquid is not supplied through a separate flexible pipeline with random bends. Instead, it is supplied through the push rod 8, swing rod 10, moving rod 11, and guide groove 12 to form a mechanical flow path synchronized with the nozzle's rising and falling motion. This mechanical flow path can maintain the continuity of the coating liquid flow to the atomizing nozzle 6 during nozzle height adjustment. Furthermore, the overlapping connection between the guide groove 12 and the inner cavity of the telescopic tube 5, the sealing fit at the movable hole, and the rounded transition at the end of the guide groove 12 all reduce the risks of liquid supply interruption, pressure change, local dripping, and unstable spray particle size that occur when the movable end of the telescopic tube 5 moves relative to the fixed end.

[0032] A first rotating shaft 13 is installed on one side of the movable end of the telescopic tube 5. One end of the first rotating shaft 13 extends into the interior of the telescopic tube 5 and is connected to a rotating blade 14, while the other end is connected to a first bevel gear 16. The first rotating shaft 13 is rotatably connected to the movable end of the telescopic tube 5 via a bearing. A sealing gasket is installed on the outer wall of the bearing and is connected to the telescopic tube 5 to improve the sealing performance of the installation position of the first rotating shaft 13 and reduce the risk of coating liquid leakage.

[0033] The first bevel gear 16 is disposed inside the housing 15, which is fixedly installed on the outer wall of the movable end of the telescopic tube 5. The housing 15 is locked in place by a positioning pin, allowing it to move synchronously with the movable end of the telescopic tube 5. The outer wall of the first bevel gear 16 meshes with the second bevel gear 18 for transmission. The second bevel gear 18 is fixedly installed on the rotating ring 17. A rotating groove is provided at the bottom of the inner wall of the housing 15, and the rotating ring 17 is rotatably connected to the rotating groove.

[0034] When the coating liquid flows through the telescopic tube 5, the liquid flow force acts on the rotating blade 14, causing the rotating blade 14 to rotate. The rotating blade 14 drives the first rotating shaft 13 to rotate, and the first rotating shaft 13 further drives the first bevel gear 16 to rotate. Through the meshing relationship between the first bevel gear 16 and the second bevel gear 18, the rotating ring 17 rotates inside the housing 15.

[0035] The inner wall of the telescopic tube 5 is integrally formed with a trapezoidal block 21, which is located above the rotating blade 14. This trapezoidal block 21 guides the coating liquid flowing through the telescopic tube 5, allowing the liquid flow to be more concentrated on the rotating blade 14, thus improving the stability of the rotating blade 14 during rotation. One end of the rotating ring 17 passes through the rotating groove on the housing 15 and extends to connect to the rotating rod 19. One end of the rotating rod 19 is detachably connected to a hot air gun 20. As the rotating ring 17 rotates, the rotating rod 19 drives the hot air gun 20 to move synchronously, enabling the hot air gun 20 to perform a rotary curing operation around the spraying area. This rotary heating method ensures the stability of the curing process and improves product quality.

[0036] Preferably, the outlet of the hot air gun 20 is located downstream of the atomizing nozzle 6 along the conveying direction of the conveyor line 2, and the air outlet of the hot air gun 20 is directed towards the blackboard surface area where a wet film has been formed, rather than directly towards the center of the spray cone of the atomizing nozzle 6. The air outlet direction of the hot air gun 20 forms an angle of 30°–75° with the spray axis of the atomizing nozzle 6, and the distance between the outlet of the hot air gun 20 and the blackboard surface is 80mm–200mm. This ensures that the hot air acts on the wet film area of ​​the coating already deposited on the blackboard surface, reducing the risk of the hot air blowing away paint mist in the opposite direction, causing localized exposure of the substrate, orange peel effect, or uneven flow. When the coating liquid drives the rotating blade 14, the hot air gun 20 sweeps in conjunction with the rotating ring 17, maintaining an adjacent correspondence between the hot air action area and the actual spraying area in the conveying direction, thereby achieving immediate pre-drying and curing assistance after spraying.

[0037] A movable cavity is formed between the telescopic tube 5 and the inner wall of the housing 15 for the rotating ring 17 to move, so that the rotating ring 17 can rotate stably within a limited range. The push rod 8 and the moving rod 11 are kept perpendicular to each other to ensure that the swing rod 10 is stably transmitted between the push rod 8 and the moving rod 11.

[0038] During operation, the conveyor line 2 moves the blackboard to the spraying area. The first pump 3 delivers the coating liquid from the storage tank 4 to the telescopic pipe 5, where it is sprayed onto the blackboard surface by the atomizing nozzle 6. As the blackboard position changes, the cylinder 7 drives the push rod 8 to move up and down, adjusting the atomizing nozzle 6 to a suitable spraying height. Simultaneously, as the coating liquid flows through the telescopic pipe 5, it drives the rotating blades 14 to rotate, causing the hot air gun 20 to move in tandem, synchronously heating and curing the sprayed area, thereby improving the coating quality.

[0039] During the aforementioned operation, when cylinder 7 drives push rod 8 to rise and fall, push rod 8 simultaneously raises and lowers the movable end of telescopic tube 5 and atomizing nozzle 6 via crossbeam 9, and simultaneously moves moving rod 11 within the movable hole at the fixed end of telescopic tube 5 via swing rod 10. This ensures that the guide groove 12 within moving rod 11 remains connected to the inner cavity of telescopic tube 5 as the position of the movable end of telescopic tube 5 changes. Consequently, when atomizing nozzle 6 is height adjusted, the coating liquid flow path between the first pump body 3 and atomizing nozzle 6 remains continuous, reducing the risk of liquid supply interruption, pressure fluctuations, localized dripping, or unstable atomization caused by the relative movement of telescopic tube 5.

[0040] Simultaneously, as the coating liquid flows within the telescopic tube 5, it is guided by the trapezoidal block 21 and acts on the rotating blade 14, causing the rotating blade 14 to drive the first rotating shaft 13 to rotate. The first rotating shaft 13 further drives the rotating rod 19 and the hot air gun 20 via the first bevel gear 16, the second bevel gear 18, and the rotating ring 17. Since the action of the hot air gun 20 is triggered by the flow of the coating liquid, the spraying action and the hot air curing action can be carried out synchronously near the moving end of the same telescopic tube 5, thereby reducing the time lag between the fixed curing station and the spraying position, which helps to reduce problems such as wet film accumulation, local sagging, and untimely post-spray curing.

[0041] The absorption hood 26 is fixedly installed on the movable end of the telescopic pipe 5 and is connected to the treatment box 23 through the corrugated hose 25 and the second pump body 24. The corrugated hose 25 can adapt to the lifting and lowering displacement of the movable end of the telescopic pipe 5, so that the absorption hood 26 moves synchronously with the atomizing nozzle 6 and the hot air gun 20. As a result, the exhaust gas extraction position can be close to the spray curing source, and volatile gases, odors and suspended coating particles generated during the spraying and hot air curing process can be extracted in a timely manner, reducing the diffusion of exhaust gas into the production environment.

[0042] The exhaust gas treatment mechanism 22 includes a treatment box 23, which is located on one side of the production line. One end of the treatment box 23 is connected to a corrugated hose 25 via a second pump body 24. The corrugated hose 25 has telescopic adjustment capability to accommodate positional changes in the hot air gun 20 and the absorption hood 26 as the telescopic tube 5 moves. The corrugated hose 25 is threaded onto the absorption hood 26, which is located outside the hot air gun 20 and fixed to the moving end of the telescopic tube 5 with bolts. When volatile gases are generated during the spraying and curing process, the second pump body 24 is activated, creating negative pressure suction in the area near the hot air gun 20 through the absorption hood 26, allowing the exhaust gas generated in the spraying area to enter the treatment box 23 in a timely manner.

[0043] A drive motor 27 is fixedly installed on the outer wall of the treatment box 23. The output shaft of the drive motor 27 is connected to a second rotating shaft 28, which is rotatably installed inside the treatment box 23. Multiple first activated carbon plates 29 are arranged in a ring on the outer wall of the second rotating shaft 28. When the drive motor 27 is working, it drives the second rotating shaft 28 to rotate, causing the first activated carbon plates 29 to rotate synchronously inside the treatment box 23, thereby increasing the contact area between the waste gas and the first activated carbon plates 29 and improving the waste gas adsorption treatment efficiency.

[0044] The outer wall of the first activated carbon plate 29 is integrally formed with an arc-shaped portion 30, the upper and lower ends of which are respectively in contact with the first lifting plate 31 and the second lifting plate 32. When the first activated carbon plate 29 rotates, the arc-shaped portion 30 can periodically push the first lifting plate 31 and the second lifting plate 32 to move up and down.

[0045] U-shaped plates 33 are fixedly installed on both sides of the top of the first lifting plate 31. The interior of the U-shaped plates 33 movably abuts against the pull rod 34. The top of the pull rod 34 passes through the opening 36 on the panel 35 and extends to connect to the sealing plate 37. One end of the sealing plate 37 is rotatably connected to the top of the panel 35 via a hinge 38. A first spring 39 connects the panel 35 and the top of the inner wall of the processing box 23. When the first lifting plate 31 moves up and down, the U-shaped plates 33 drive the pull rod 34 to move, causing the sealing plate 37 to open or close around the hinge 38, thereby adjusting the gas discharge state inside the processing box 23. At the same time, a second spring 40 is provided between the first lifting plate 31 and the inner wall of the processing box 23 to assist the first lifting plate 31 in resetting.

[0046] A sleeve 41 is fixedly installed on the outer wall of the second lifting plate 32 by a bracket. A top rod 42 is snapped into the bottom of the sleeve 41. The lower end of the top rod 42 moves through the through hole on the second activated carbon plate 43 and is adapted to the size of the through hole on the second activated carbon plate 43.

[0047] When the second lifting plate 32 is pushed up and down by the arc-shaped part 30, the sleeve 41 drives the top rod 42 to move synchronously, causing the top rod 42 to periodically pass through the through holes on the second activated carbon plate 43, cleaning any impurities that may be attached inside the through holes and preventing clogging of the filter channel. The second activated carbon plate 43 is horizontally embedded in the inner wall of the treatment box 23, and a third spring 44 connects the second lifting plate 32 to the inner wall of the treatment box 23. An air inlet connected to the second pump body 24 is provided below the second activated carbon plate 43, and an air outlet is provided above the sealing plate 37.

[0048] After entering the treatment chamber 23, the exhaust gas first undergoes preliminary filtration and adsorption through the second activated carbon plate 43, then enters the area of ​​the first activated carbon plate 29 for further purification, and finally exits through the outlet above the sealing plate 37. The multi-stage filtration structure and dynamic turbulence structure improve the exhaust gas purification effect while reducing the possibility of clogging of the filter components during long-term operation.

[0049] In a more detailed description, when the first lifting plate 31 moves downward, it drives the sealing plate 37 to rotate around the hinge 38 via the U-shaped plate 33 and the pull rod 34. The sealing plate 37 is used to intermittently block and guide the airflow through the opening 36 on the panel 35. When the sealing plate 37 intermittently blocks the opening 36, the exhaust gas forms a deflection path between the second activated carbon plate 43 and the first activated carbon plate 29, thereby increasing the contact time and probability between the exhaust gas and the first activated carbon plate 29 and the second activated carbon plate 43. When the sealing plate 37 opens the opening 36, the treated gas is discharged through the outlet to avoid abnormal pressure rise in the treatment box 23. The matching size of the top rod 42 with the through hole on the second activated carbon plate 43 means that the outer diameter of the top rod 42 is smaller than the diameter of the through hole, allowing the top rod 42 to repeatedly insert and withdraw within the through hole. When the push rod 42 is inserted into the through hole, it pushes and cleans the coating particles or impurities attached to the through hole; when the push rod 42 is withdrawn from the through hole, it restores the ventilation area of ​​the through hole, so that the second activated carbon plate 43 maintains ventilation stability during long-term operation.

[0050] Furthermore, when the first lifting plate 31 moves downward, the sealing plate 37 is only used to change the flow path and residence time of the exhaust gas through the activated carbon plate; the treatment box 23 maintains a negative pressure or slightly negative pressure state during the operation of the second pump body 24, the outlet is not completely closed, and the treatment box 23 does not improve the adsorption performance of activated carbon by compressing the exhaust gas to raise the temperature. The treatment box 23 is equipped with a pressure relief port or bypass exhaust channel, which opens when the pressure inside the box is higher than the preset pressure.

[0051] During startup, the drive motor 27 can rotate the first activated carbon plate 29. The rotation of the first activated carbon plate 29 can expand the contact area with the exhaust gas, and absorb the particulate matter in the exhaust gas through adsorption. In addition, during the rotation of the first activated carbon plate 29, when it comes into contact with the first lifting plate 31 and the second lifting plate 32 at both ends, the first lifting plate 31 and the second lifting plate 32 move outward or inward in opposite directions simultaneously. When the U-shaped plate 33 on the first lifting plate 31 comes into contact with the pull rod 34, it can drive the sealing plate 37 to rotate on the hinge 38 and open the opening 36 to facilitate the exhaust gas discharge. At the same time, when the second lifting plate 32 moves downward, it can drive the top rod 42 to push downward in the second lifting plate 32, thereby preventing the particulate matter from clogging the second filter plate.

[0052] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0053] The preferred embodiments of the present invention disclosed above are only for the purpose of illustrating the present invention.

[0054] The preferred embodiments do not describe all details exhaustively, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. These embodiments have been selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to well understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automated spraying and curing production line for blackboard surface coating, characterized in that, include: Spray curing mechanism (1), the spray curing mechanism (1) includes a conveyor line (2), a storage tank (4) connected to a first pump body (3) is installed on the frame of the conveyor line (2), a telescopic pipe (5) passing through the frame is connected to the bottom of the first pump body (3), an atomizing nozzle (6) adapted to it is installed at the bottom of the telescopic pipe (5), and a cylinder (7) is positioned on the frame. The piston rod on the cylinder (7) extends to the push rod (8) at its bottom. The push rod (8) and the movable end on the telescopic tube (5) are fixedly connected by a crossbeam (9). One end of the outer wall of the push rod (8) is connected to a moving rod (11) via a swing rod (10). The outer wall of the moving rod (11) is slidably connected to the movable hole at the fixed end of the telescopic tube (5). A guide groove (12) is provided on the moving rod (11) that penetrates the interior of the moving rod (11) and communicates with the telescopic tube (5).

2. The automatic spraying and curing production line for blackboard surface coating according to claim 1, characterized in that, A first rotating shaft (13) is installed on one side of the movable end of the telescopic tube (5). One end of the first rotating shaft (13) is connected to a rotating blade (14) placed inside the telescopic tube (5), and the other end is connected to a first bevel gear (16) placed on the inner wall of the housing (15). The outer wall of the housing (15) is fixedly installed on the outer wall of the movable end of the telescopic tube (5) by locking with a positioning pin. The outer wall of the first bevel gear (16) meshes with a second bevel gear (18) fixed on the rotating ring (17). A rotating groove connected to the rotating ring (17) is opened at the bottom of the inner wall of the housing (15).

3. The automatic coating and curing production line for blackboard surface as described in claim 2, characterized in that, The lower end of the rotating ring (17) passes through the rotating groove and is connected to the rotating rod (19). One end of the rotating rod (19) is connected to a hot air gun (20) in a detachable manner. The hot air gun (20) is located downstream of the atomizing nozzle (6) along the direction of movement of the conveyor line (2) and is used to synchronously heat-cur the wet film area formed by the atomizing nozzle (6). The rotating ring (17) is provided with an arc-shaped limiting groove so that the hot air gun (20) swings back and forth between the first limit angle and the second limit angle. The power supply wire of the hot air gun (20) is arranged through a flexible drag chain. The telescopic tube (5) and the inner wall of the housing (15) together form an active cavity for the rotating ring (17) to move. The inner wall of the telescopic tube (5) is integrally formed with a trapezoidal block (21) placed above the rotating blade (14). The two ends of the swing rod (10) are rotatably connected to the push rod (8) and the moving rod (11) respectively.

4. The automatic spraying and curing production line for blackboard surface coating according to claim 3, characterized in that, The push rod (8) and the moving rod (11) are arranged vertically. The movable end of the telescopic tube (5) is provided with a bearing connected to the first rotating shaft (13). The outer wall of the bearing is equipped with a sealing gasket connected to the telescopic tube (5).

5. The automatic spraying and curing production line for blackboard surface coating according to claim 3, characterized in that, It also includes a waste gas treatment mechanism (22), which includes a treatment box (23). One end of the treatment box (23) is connected to a corrugated hose (25) via a second pump body (24). The corrugated hose (25) is installed in an absorption hood (26) outside the hot air gun (20) by means of a threaded connection. The absorption hood (26) is installed on the movable end of the telescopic tube (5) by means of bolt locking. A drive motor (27) is fixedly installed on the outer wall of the treatment box (23). The output shaft of the drive motor (27) is connected to a second rotating shaft (28) placed on the inner wall of the treatment box (23). A first activated carbon plate (29) is distributed in a ring on the second rotating shaft (28).

6. The automatic spraying and curing production line for blackboard surface coating according to claim 5, characterized in that, The outer wall of the first activated carbon plate (29) is integrally formed with an arc-shaped part (30). The arc-shaped part (30) constitutes a cam part that rotates with the first activated carbon plate (29). The first lifting plate (31) and the second lifting plate (32) slide along the first guide groove and the second guide groove in the treatment box (23), respectively. When the cam part rotates, it pushes against the first lifting plate (31) and the second lifting plate (32) in sequence to generate a preset direction displacement. U-shaped plates (33) are fixedly installed on both sides of the top end of the first lifting plate (31). The lower end of the pull rod (34) is provided with a limiting flange. The limiting flange is located in the opening of the U-shaped plate (33). When the first lifting plate (31) moves upward, the U-shaped plate (33) pushes against the limiting flange and drives the pull rod (34) to move upward. When the first lifting plate (31) returns to its original position downward, the seal is closed. The plate (37) drives the pull rod (34) to reset under the action of the first spring (39). The top of the pull rod (34) passes through the opening (36) on the panel (35) and extends to the sealing plate (37). One end of the sealing plate (37) is rotatably connected to the top of the panel (35) through the hinge (38). The panel (35) and the top of the inner wall of the treatment box (23) are connected by the first spring (39). The first lifting plate (31) and the inner wall of the treatment box (23) are connected by the second spring (40). The treatment box (23) is equipped with a pressure detection device and a pressure relief bypass. The pressure detection device is used to detect the pressure inside the treatment box (23). The pressure relief bypass is used to conduct when the pressure inside the treatment box (23) exceeds the preset value. When the second pump body (23) is running, the treatment box (23) maintains a negative pressure or slightly negative pressure state.

7. The automatic spraying and curing production line for blackboard surface coating according to claim 6, characterized in that, A sleeve (41) is fixedly installed on the outer wall of the second lifting plate (32) by a bracket. A top rod (42) is connected to the bottom of the sleeve (41) by a snap-fit ​​installation. The bottom of the top rod (42) moves through the through hole on the second activated carbon plate (43). The top rod (42) is adapted to the size of the through hole on the second activated carbon plate (43).

8. The automatic spraying and curing production line for blackboard surface coating according to claim 7, characterized in that, The second activated carbon plate (43) is installed on the inner wall of the processing box (23) by horizontal embedding. The second lifting plate (32) is connected to the inner wall of the processing box (23) by a third spring (44). An air inlet connected to the second pump body (24) is provided below the second activated carbon plate (43). An air outlet placed on the inner wall of the processing box (23) is provided above the sealing plate (37). The conveyor line (2) is installed on the frame and extends along the length of the frame to carry and convey the blackboard.

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