Plate surface paint brushing device for furniture processing and processing method of plate surface paint brushing device

Abstract

The invention relates to a plate surface paint brushing device for furniture processing and a processing method thereof. The plate surface paint brushing device effectively solves the problems that an existing paint brushing device is low in precision, cannot guarantee the paint film flatness, cannot fully and uniformly brush paint, is low in efficiency and affects the furniture quality. According to the technical scheme, the plate surface paint brushing device for furniture processing and the processing method of the plate surface paint brushing device for furniture processing have the advantages that paint with uniform thickness is brushed on the surface of a plate through a double-step type suspension scraper mechanism, the flatness of the paint surface is guaranteed, a self-adaptive curing mechanism can heat and cure the paint, the curing efficiency is improved, an air cooling mechanism can quickly cool the paint surface, and the paint surface can be quickly cooled. Cooling time consumption is reduced; and the floating type grinding mechanism can finely grind the cured paint surface and remove salient points on the paint surface, dust generated during grinding can be fully recycled by the dust collection mechanism, dust attachment on the paint surface is further reduced, so that the paint brushing quality of the plate is improved, the paint brushing efficiency of the plate can be greatly improved, and the device is more convenient to use during furniture processing.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture board painting devices, and particularly to a surface painting device for furniture processing boards and a processing method thereof. Background Art

[0002] With the improvement of living standards and the increasing attention to environmental protection, in the selection of furniture materials, wooden furniture has gradually attracted more and more people's attention. In the production and manufacturing of wooden furniture, a painting device is required. The painting device is used to apply a paint layer on the surface of the wooden furniture, so as to improve the aesthetics of the wooden furniture and play a role in preventing insects and moisture.

[0003] Currently, when painting furniture boards, most of them use the method of manually operating the painting device to paint the boards, which wastes manpower. Moreover, the existing painting devices have a simple structure, low painting accuracy for the boards, cannot ensure the flatness of the paint film, cannot paint the boards evenly enough, resulting in inconsistent paint film thickness at different parts of the board surface, affecting the production quality; and the existing painting devices have low efficiency, affecting production capacity, and cannot effectively remove dust when grinding the paint surface, thus causing environmental dust to adhere to the paint surface again, affecting the adhesion of the paint film, and further affecting the overall production quality of the furniture.

[0004] In view of the above, we provide a surface painting device for furniture processing boards and a processing method thereof to solve the above problems. Summary of the Invention

[0005] In view of the above situation, the present invention provides a surface painting device for furniture processing boards and a processing method thereof. The device can ensure the flatness of the paint surface, ensure that the paint film thickness at each part of the board surface is consistent, improve the painting quality of the board, and greatly accelerate the painting efficiency of the board, and is more convenient to use during furniture processing.

[0006] A device for painting the surface of a board for furniture processing and a processing method thereof, comprising a conveyor line, a first support frame, a second support frame and a third support frame, wherein a movable platform capable of driving the board to move is provided at the top of the conveyor line, the first support frame, the second support frame and the third support frame are all fixedly mounted on the top of the conveyor line, a spatial movable mechanism is provided at the top of the first support frame and a movable end of the spatial movable mechanism is provided with a double-step suspended scraper mechanism for painting the board, a preheating tube for preheating the board is fixedly mounted on the side of the first support frame away from the second support frame, an adaptive curing mechanism for curing the paint surface on the surface of the board is provided on the inner top wall of the second support frame and an air cooling mechanism for quickly cooling the paint surface is provided on the side of the interior away from the first support frame, an electrostatic dust removal rod is fixedly mounted on the top of the third support frame on the side close to the second support frame, a four-way adjustment mechanism is provided in the middle of the top of the third support frame and a floating polishing mechanism for removing paint bumps is provided at the movable end of the bottom of the four-way adjustment mechanism, and a dust suction mechanism for timely absorbing dust is provided on the side of the floating polishing mechanism close to the electrostatic dust removal rod.

[0007] Preferably, the mobile platform is composed of a transmission mechanism and a plate fixing mechanism, the transmission mechanism includes a first motor, a pulley shaft and a belt, the number of the pulley shafts is two, and the two pulley shafts are rotatably connected to the two sides of the top of the conveyor line, the output end of the first motor is connected to one of the pulley shafts through a spline, and the two sides of the two pulley shafts are transmission-connected with belts; the plate fixing mechanism includes a connecting block, a movable plate, a clamping frame and a first electric push rod, the four corners of the lower surface of the movable plate are fixedly connected to the connecting blocks, and the connecting blocks on both sides are fixedly connected to the upper surface of the corresponding belt, the two sides of the movable plate are transversely penetrated by symmetrically arranged clamping frames, and the middle of both sides of the lower surface of the movable plate are fixedly installed with the first electric push rod, and the ends of the movable rod bodies of the two first electric push rods are respectively fixedly connected to the middle of the two clamping frames close to one end.

[0008] Preferably, the spatial movement mechanism includes a first lead screw, a second motor, a transverse movement frame, a second lead screw, and a third motor. There are two first lead screws, and the two first lead screws are respectively horizontally rotatably connected to both sides of the top of the first support frame. The same ends of the two first lead screws are drivingly connected by a transmission belt, and the output end of the second motor is connected to one of the first lead screws through a spline. Both ends of the transverse movement frame are drivingly connected to the outside of the two first lead screws, and the second lead screw is horizontally rotatably connected to the inside of the transverse movement frame. The second lead screw is perpendicular to the two first lead screws. The output end of the third motor is connected to the second lead screw through a spline. The spatial movement mechanism further includes a lead screw slider, a horizontal fixing plate, and a second electric push rod. The lead screw slider is drivingly connected to the outside of the second lead screw and is fixedly connected to the horizontal fixing plate at the bottom. Second electric push rods are vertically fixedly installed on both sides of the upper surface of the horizontal fixing plate, and the movable rods of the two second electric push rods penetrate below the horizontal fixing plate.

[0009] Preferably, the double-stage floating paint scraping mechanism includes a tool holder, a paint scraper, and a paint injection pipe. The tool holder is fixedly connected to the bottoms of the movable rods of the two second electric push rods, and the paint scraper is fixedly connected to the lower surface of the tool holder in an inclined state. A paint distribution cavity capable of storing paint is provided inside the paint scraper, and a plurality of flow equalizing holes are horizontally and equidistantly opened at the bottom end. The outlet end of the paint injection pipe is fixedly connected to the upper surface of the paint scraper and communicates with the paint distribution cavity inside it. The inlet end of the paint injection pipe penetrates the upper surface of the tool holder and communicates with an external paint conveying pipeline. A laser rangefinder vertically downward is fixedly installed in the middle of the top end of the paint scraper.

[0010] Preferably, the double-stage floating paint scraping mechanism further includes two third electric push rods, a connecting plate, springs, a double-layer polyurethane paint scraper, and a micro vibration motor. There are two third electric push rods, and the two third electric push rods are respectively horizontally fixedly installed on both sides of the lower surface of the tool holder. The connecting plate is fixedly connected to the ends of the movable rods of the two third electric push rods. There are several springs, and several springs are equidistantly fixedly connected to the lower surface of the connecting plate. The double-layer polyurethane paint scraper is fixedly connected to the bottom ends of the several springs. The micro vibration motor is fixedly installed in the middle of the upper surface of the double-layer polyurethane paint scraper. The bottom end of the double-layer polyurethane paint scraper and the bottom end of the paint scraper are on the same horizontal plane and have the same width.

[0011] Preferably, the adaptive curing mechanism includes infrared lamps and temperature sensors. There are several infrared lamps, and several infrared lamps are equidistantly fixedly installed on the inner top wall of the second support frame. A temperature sensor is arranged between every two adjacent infrared lamps in the same row, and several temperature sensors are fixedly installed on the top of the second support frame and the detection directions are all vertically downward.

[0012] Preferably, the air cooling mechanism includes a fourth electric push rod, a fixed frame, a fifth electric push rod, a rack, a spur gear and a wind knife, the fixed rod body of the fourth electric push rod is vertically fixedly installed on the side of the upper surface of the second support frame away from the first support frame, the fixed frame is fixedly connected to the bottom of the movable rod body of the fourth electric push rod and the fixed rod body of the fifth electric push rod is horizontally fixedly installed on the side of the fixed frame, the fixed frame is fixedly installed with a laser rangefinder in the middle of the side near the fifth electric push rod, the rack is fixedly connected to the end of the movable rod body of the fifth electric push rod and is horizontally passed through the bottom of the fixed frame, the number of the spur gears is two and the two spur gears are respectively fixedly connected to both sides of the upper surface of the wind knife, and the two spur gears and both sides of the wind knife are rotatably connected to the bottom of the fixed frame, the air inlet end of the wind knife is connected to the external air supply duct, the number of the fifth electric push rod and the rack are both two and the two spur gears are respectively meshed with the two racks.

[0013] Preferably, the four-way adjustment mechanism includes a third lead screw, a fourth motor, a support plate and a sixth electric push rod, the third lead screw is horizontally rotatably connected to the top of the third support frame and is connected to the output end of the fourth motor through a spline, the fourth motor is fixedly mounted on the side of the third support frame, the top of the third support frame is fixedly connected to a guide rod and one side of the support plate is sleeved on the outside of the guide rod and the other side is transmission-connected to the outside of the third lead screw, the number of the sixth electric push rod is two and the fixed rod bodies of the two sixth electric push rods are respectively vertically fixed on both sides of the upper surface of the support plate.

[0014] Preferably, the floating grinding mechanism includes a lifting frame, a rotating shaft, a ceramic sanding belt and a fifth motor, the lifting frame is fixedly mounted on the bottom of the movable rod body of the sixth electric push rod and the four corners of its upper surface are fixedly connected to auxiliary rods, the four auxiliary rods are all passed through the four corners of the support plate, both sides of the interior of the lifting frame are rotatably connected to the rotating shaft and the ceramic sanding belt is transmission-connected to the outside of the two rotating shafts, the fifth motor is fixedly mounted on the side of the lifting frame and the output end is connected to one of the rotating shafts through a spline; the dust suction mechanism It includes a negative pressure dust suction pipe and a diversion telescopic negative pressure pipe. The negative pressure dust suction pipe is fixedly connected to the side of the lifting frame close to the electrostatic dust removal rod, and the air inlet end of the negative pressure dust suction pipe is inclined and corresponds to the lower surface of the ceramic sanding belt. A laser rangefinder is fixedly installed on the middle part of the negative pressure dust suction pipe away from the lifting frame. The diversion end of the diversion telescopic negative pressure pipe is fixedly connected to the air outlet end at the top of the negative pressure dust suction pipe and is connected to the interior thereof. The top end of the diversion telescopic negative pressure pipe passes through the upper surface of the third support frame and is connected to the external negative pressure pipe.

[0015] A method for processing a device for painting the surface of a panel for furniture processing, comprising the following steps: 1. Move the sheet fixing mechanism to the end near the first motor through the conveying mechanism, and then place the sheet to be painted on the sheet fixing mechanism. The sheet fixing mechanism can clamp and fix the sheet, and then drive the sheet to move backward at a constant speed through the conveying mechanism; 2. When the sheet moves under the preheating pipe, the preheating pipe blows hot air at a set temperature onto the upper surface of the sheet to preheat the surface of the sheet, thereby improving the adhesion of the paint. When the sheet completely moves under the first support frame, control the conveying mechanism to pause, and then control the spatial movement mechanism to adjust the height of the double-stage floating scraper mechanism according to the measurement data of the laser rangefinder, so that the distance between the bottom end of the double-stage floating scraper mechanism and the upper surface of the sheet is maintained between.mm and.mm. Inject paint into the paint scraper through the external paint injection pipe to make the paint output of each flow equalizing hole consistent, and operate the micro vibration motor to make the double-layer polyurethane scraper generate high-frequency micro vibrations, prevent paint accumulation, and improve the leveling property. At the same time, control the double-stage floating scraper mechanism to move horizontally at a constant speed in the direction opposite to the moving direction of the sheet through the spatial movement mechanism to initially paint the sheet; 3. After the double-stage floating scraper mechanism driven by the spatial movement mechanism completely paints the upper surface of the sheet once, drive the sheet to continue moving backward through the conveying mechanism. When the sheet enters under the second support frame, the adaptive curing mechanism can heat and cure the surface of the paint film on the sheet to prevent sagging, and the adaptive curing mechanism can control the temperature in zones, which is convenient for dynamically adjusting the heating temperature according to the temperature of each part of the sheet to prevent overheating and cracking. After the heating of the paint film is completed, the height and blowing angle of the air cooling mechanism can be adjusted to ensure that the air flow completely covers the paint surface of the sheet, and blow out low-temperature and high-speed air flow onto the paint surface of the sheet to reduce the temperature of the paint film to ℃ within seconds, which can greatly reduce the interlayer waiting time; 4. After the paint surface of the sheet is cured and cooled, drive the sheet to continue moving backward through the conveying mechanism. The electrostatic dust removal rod on the third support frame operates to remove the dust attachment between layers. At the same time, operate the floating grinding mechanism, and adjust the lower surface of the floating grinding mechanism to the position that fits the paint surface according to the laser rangefinder on the side of the negative pressure dust suction exhaust pipe to grind the paint surface and remove the convex points on the paint surface, while the dust suction mechanism can collect the dust from the grinding part and recycle the dust immediately. When the floating grinding mechanism finishes grinding the corresponding paint surface, adjust the horizontal position of the floating grinding mechanism through the four-way adjustment mechanism to make it correspond to the unground area of the paint surface, and make the sheet return to the position corresponding to the electrostatic dust removal rod again through the conveying mechanism and move backward at a constant speed again, so that the floating grinding mechanism grinds the unground part. Repeat the above operation until the entire paint surface of the sheet is ground once; thus, a complete painting process is completed; V. Next, drive the board to return to the initial position again through the conveying mechanism, and continue to repeat the above steps 1 to 4. According to the final required paint thickness on the board, paint the board multiple times.

[0016] The beneficial effects of the above technical solutions are as follows: The paint brushing device for the surface of the board used in furniture processing and its processing method can apply paint with a uniform thickness to the surface of the board through a two-stage floating scraper mechanism, and can ensure the flatness of the paint surface, ensure that the film thickness of each part on the surface of the board is consistent. The adaptive curing mechanism can heat and cure the paint, and can dynamically adjust the heating temperature in real time according to the temperature of the paint surface, ensuring that the paint surface will not crack due to overheating while curing the paint surface at the fastest speed, accelerating the curing efficiency. The air-cooling mechanism can quickly cool the paint surface, further reducing the cooling time; the electrostatic dust removal rod can remove the dust on the paint surface, ensuring good adhesion during subsequent multiple paint brushing operations, and the floating grinding mechanism can finely grind the cured paint surface, removing the convex points on the paint surface to ensure the flatness of the paint surface. At the same time, the dust collection mechanism can fully correspond to the floating grinding mechanism, and the dust generated during the grinding of the floating grinding mechanism will be fully recovered by the dust collection mechanism, further reducing the dust adhesion on the paint surface, thereby improving the paint brushing quality of the board. Moreover, this device can make the entire set of paint brushing processes cooperate with each other, greatly accelerating the paint brushing efficiency of the board, effectively improving the production capacity of furniture, and being more convenient to use during furniture processing. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the first lead screw and the second lead screw of the present invention; Figure 3 It is a schematic diagram of the two-stage floating scraper mechanism of the present invention; Figure 4 It is a schematic cross-sectional view of the paint scraper of the present invention; Figure 5 It is for the present invention Figure 3 schematic diagram of the disassembled state; Figure 6 It is a schematic diagram of the air-cooling mechanism of the present invention; Figure 7 It is for the present invention Figure 6 schematic diagram of the disassembled state; Figure 8 It is a schematic diagram of the adaptive curing mechanism of the present invention; Figure 9 It is a schematic diagram of the overall structure of the third support frame of the present invention; Figure 10 It is a schematic diagram of the four-way adjustment mechanism, the floating grinding mechanism and the dust collection mechanism of the present invention; Figure 11 It is a schematic diagram of the disassembled state of the floating grinding mechanism and the dust collection mechanism of the present invention; Figure 12 Schematic diagram of the split state of the conveying mechanism of the platform of the present invention; Figure 13 Schematic diagram of the split state of the plate fixing mechanism of the present invention.

[0018] In the figure: 1, conveying line; 2, first support frame; 3, second support frame; 4, third support frame; 5, electrostatic dust removal rod; 6, conveying mechanism; 601, first motor; 602, pulley shaft; 603, belt; 7, plate fixing mechanism; 701, connecting block; 702, moving plate; 703, clamping frame; 704, first electric push rod; 8, first lead screw; 9, second motor; 10, transverse moving frame; 11, second lead screw; 12, third motor; 13, lead screw slider; 14, horizontal fixing plate; 15, second electric push rod; 16, tool rest; 17, paint scraper; 18, paint injection pipe; 19, laser rangefinder; 20, third electric push rod; 21, connecting plate; 22, spring; 23, double-layer polyurethane scraper; 24, micro vibration motor; 25, infrared lamp; 26, temperature sensor; 27, fourth electric push rod; 28, fixing frame; 29, fifth electric push rod; 30, rack; 31, spur gear; 32, air knife; 33, third lead screw; 34, fourth motor; 35, support plate; 36, sixth electric push rod; 37, guide rod; 38, lifting frame; 39, rotating shaft; 40, ceramic abrasive belt; 41, fifth motor; 42, negative pressure dust suction exhaust pipe; 43, shunt telescopic negative pressure pipe; 44, preheating pipe. Specific embodiments

[0019] Regarding the foregoing and other technical contents, features and effects of the present invention, they can be clearly presented in the following detailed description of the embodiments in conjunction with the attached Figures 1 to 13 In the detailed description of the embodiments below, the structural contents mentioned in the following embodiments are all with reference to the accompanying drawings of the specification.

[0020] This embodiment provides a device for painting the surface of a plate for furniture processing and its processing method, as shown in the attached Figures 1-13As shown in the figure, it includes a conveyor line 1, a first support frame 2, a second support frame 3 and a third support frame 4. A moving platform capable of driving the movement of the plate is provided on the top of the conveyor line 1. The moving platform is composed of a transmission mechanism 6 and a plate fixing mechanism 7. The transmission mechanism 6 includes a first motor 601, a pulley shaft 602 and a belt 603. The number of pulley shafts 602 is two, and the two pulley shafts 602 are respectively rotatably connected to both sides of the top of the conveyor line 1. The output end of the first motor 601 is connected to one of the pulley shafts 602 through a spline, and the first motor 601 is fixedly installed at the top end of the side of the conveyor line 1. Both sides of the two pulley shafts 602 are drivingly connected with a belt 603. The first motor 601 drives the pulley shaft 602 connected to it to rotate, which can drive the belts 603 on both sides to rotate synchronously. The plate fixing mechanism 7 includes a connecting block 701, a moving plate 702, a clamping frame 703 and a first electric push rod 704. Connecting blocks 701 are fixedly connected to the four corners of the lower surface of the moving plate 702, and the connecting blocks 701 on both sides are fixedly connected to the upper surface of the corresponding belt 603. Guide rods 37 are fixedly connected to both sides of the top of the conveyor line 1. The connecting blocks 701 on both sides of the lower surface of the moving plate 702 are sleeved outside the guide rods 37 and can slide horizontally along the outside thereof. When the belt 603 rotates, it can drive the moving plate 702 to move horizontally through the connecting block 701. The guide rods 37 can ensure the smooth movement of the moving plate 702, thereby improving the accuracy of painting the plate. Clamping frames 703 arranged symmetrically are horizontally penetrated through both sides of the moving plate 702, and first electric push rods 704 are fixedly installed in the middle of both sides of the lower surface of the moving plate 702. The end portions of the movable rod bodies of the two first electric push rods 704 are respectively fixedly connected to the middle portions of the mutually approaching ends of the two clamping frames 703. The first electric push rods 704 move synchronously, which can push the clamping frames 703 on both sides to approach or move away from each other, so as to clamp and fix the plate with the clamping frames 703.

[0021] The first support frame 2, the second support frame 3 and the third support frame 4 are all fixedly installed on the top of the conveyor line 1. A spatial movement mechanism is provided at the top end of the first support frame 2. The spatial movement mechanism includes a first lead screw 8, a second motor 9, a lateral movement frame 10, a second lead screw 11 and a third motor 12. The number of the first lead screws 8 is two, and the two first lead screws 8 are respectively horizontally rotatably connected to both sides of the top of the first support frame 2. The same ends of the two first lead screws 8 are connected by a transmission belt, and the output end of the second motor 9 is connected to one of the first lead screws 8 through a spline. A motor base is fixedly connected to one side of the first support frame 2 close to the second motor 9, and the second motor 9 is fixedly installed on the side of the motor base. Both ends of the lateral movement frame 10 are drivingly connected to the outside of the two first lead screws 8, and the second lead screw 11 is horizontally rotatably connected to the inside of the lateral movement frame 10. The second lead screw 11 is perpendicular to the two first lead screws 8. The output end of the third motor 12 is connected to the second lead screw 11 through a spline, and the third motor 12 is fixedly installed on one side of the lateral movement frame 10; the spatial movement mechanism further includes a lead screw slider 13, a horizontal fixing plate 14 and a second electric push rod 15. The lead screw slider 13 is drivingly connected to the outside of the second lead screw 11 and fixedly connected to the horizontal fixing plate 14 at the bottom. A guide rod 37 is also fixedly connected to the middle of the lateral movement frame 10, and the top of the lead screw slider 13 is sleeved on the outside of the guide rod 37 and can slide horizontally along the outside thereof. When the second motor 9 drives the first lead screw 8 connected thereto to rotate, it can drive the other first lead screw 8 to rotate through the transmission belt, so as to enable the two first lead screws 8 to drive the lateral movement frame 10 to horizontally move laterally along the direction of the first lead screw 8. When the third motor 12 drives the second lead screw 11 to rotate, it can drive the lead screw slider 13 to horizontally move laterally along the direction of the second lead screw 11. Second electric push rods 15 are vertically and fixedly installed on both sides of the upper surface of the horizontal fixing plate 14, and the movable rods of the two second electric push rods 15 all pass through the lower part of the horizontal fixing plate 14. The second electric push rods 15 can drive the double-stage floating scraper mechanism below them to move up and down, so that the spatial movement mechanism can drive the double-stage floating scraper mechanism to move in any direction, facilitating the adjustment of its spatial position.

[0022] The movable end of the space activity mechanism is provided with a two-stage floating scraper mechanism for painting the board. The two-stage floating scraper mechanism includes a tool rest 16, a paint scraper 17 and a paint injection pipe 18. The tool rest 16 is fixedly connected to the bottom of the movable rods of two second electric push rods 15, and the paint scraper 17 is fixedly connected to the lower surface of the tool rest 16 in an inclined state. The interior of the paint scraper 17 is provided with a paint distribution cavity for storing paint, and a plurality of flow equalizing holes are horizontally and equidistantly opened at the bottom end. The outlet end of the paint injection pipe 18 is fixedly connected to the upper surface of the paint scraper 17 and communicates with the paint distribution cavity inside it. The inlet end of the paint injection pipe 18 penetrates through the upper surface of the tool rest 16 and communicates with an external paint delivery pipeline. Paint can be injected into the paint injection pipe 18 through the external paint delivery pipe and fill the paint distribution cavity, and then discharged from the flow equalizing holes at the bottom of the paint scraper 17 to the surface of the board, enabling the paint to be evenly applied to the surface of the board. In the middle of the top end of the paint scraper 17, a vertically downward laser rangefinder 19 is fixedly installed. Through the laser rangefinder 19, the space activity mechanism can adjust the paint scraper 17 to the position where it fits the surface of the board. The distance between the bottom end of the paint scraper 17 and the surface of the board can be set according to the thickness of the paint to be applied. The two-stage floating scraper mechanism further includes two third electric push rods 20, a connecting plate 21, springs 22, a double-layer polyurethane scraper 23 and a micro vibration motor 24. The number of the third electric push rods 20 is two, and the two third electric push rods 20 are respectively horizontally and fixedly installed on both sides of the lower surface of the tool rest 16. The connecting plate 21 is fixedly connected to the ends of the movable rods of the two third electric push rods 20. Through the third electric push rods 20, the lateral distance between the double-layer polyurethane scraper 23 and the paint scraper 17 can be adjusted, so as to facilitate adjusting the distance between the two according to the painting situation of the paint and make the paint cover the board more evenly. The number of the springs 22 is several, and the several springs 22 are equidistantly fixedly connected to the lower surface of the connecting plate 21. The double-layer polyurethane scraper 23 is fixedly connected to the bottom ends of the several springs 22. The micro vibration motor 24 is fixedly installed in the middle of the upper surface of the double-layer polyurethane scraper 23. When the micro vibration motor 24 operates, it can drive the double-layer polyurethane scraper 23 to vibrate at a high frequency, thereby preventing the paint from accumulating below, eliminating scratches and achieving mirror-level flatness. The bottom end of the double-layer polyurethane scraper 23 and the bottom end of the paint scraper 17 are at the same horizontal plane and have the same width. The paint scraper 17 initially levels the paint discharged from the bottom, and then the double-layer polyurethane scraper 23 vibrating at a high frequency behind can further level the paint, ensuring that the paint has mirror-level flatness.

[0023] On one side of the first support frame 2 away from the second support frame 3, a preheating pipe 44 for preheating the board is fixedly installed. The preheating pipe 44 is communicated with an external hot air pipeline, so that hot air can be blown out from the bottom of the preheating pipe 44, thereby preliminarily preheating the upper surface of the board, improving the adhesion of the paint on the board. An adaptive curing mechanism for curing the paint surface on the board is arranged on the inner top wall of the second support frame 3. The adaptive curing mechanism includes infrared lamps 25 and temperature sensors 26. The number of infrared lamps 25 is several, and several infrared lamps 25 are fixedly installed on the inner top wall of the second support frame 3 at equal intervals. A temperature sensor 26 is arranged between every two adjacent infrared lamps 25 in the same row, and several temperature sensors 26 are fixedly installed on the top of the second support frame 3 and the detection directions are all vertically downward. When the board coated with paint moves below the second support frame 3, the infrared lamps 25 can heat the paint surface, quickly cure the paint surface, prevent the paint from sagging, and the temperature sensors 26 at different positions can respectively detect the real-time temperature of the paint surface at the corresponding positions, so as to independently control the temperature of different zones of the infrared lamps 25, dynamically adjust the curing power, and prevent the paint surface from overheating and cracking, thereby ensuring that the physical properties of each coat of paint film are consistent.

[0024] On the side of the second support frame 3 away from the first support frame 2, there is an air-cooling mechanism for quickly cooling the paint surface. The air-cooling mechanism includes a fourth electric push rod 27, a fixing frame 28, a fifth electric push rod 29, a rack 30, a spur gear 31 and an air knife 32. The fixed rod body of the fourth electric push rod 27 is vertically and fixedly installed on the upper surface of the second support frame 3 on the side away from the first support frame 2. The height of the air knife 32 can be adjusted by the fourth electric push rod 27. The fixing frame 28 is fixedly connected to the bottom of the movable rod body of the fourth electric push rod 27, and the fixed rod body of the fifth electric push rod 29 is horizontally and fixedly installed on the side surface of the fixing frame 28. A laser rangefinder 19 is fixedly installed in the middle of the side of the fixing frame 28 close to the fifth electric push rod 29. The distance between the bottom of the air knife 32 and the paint surface can be detected in real time by this laser rangefinder 19, which is convenient for adjusting the height of the air knife 32. The rack 30 is fixedly connected to the end of the movable rod body of the fifth electric push rod 29 and horizontally penetrates under the fixing frame 28. The number of spur gears 31 is two, and the two spur gears 31 are respectively fixedly connected to both sides of the upper surface of the air knife 32. Both sides of the two spur gears 31 and the air knife 32 are rotatably connected to the bottom of the fixing frame 28. The air inlet end of the air knife 32 is communicated with an external air supply pipeline. Cold air can be blown into the air knife 32 through the external air supply pipeline, so that the air outlet end of the air knife 32 blows out a low-temperature and high-speed air flow to the paint surface, quickly cooling the paint surface that has just been heated and cured, thereby shortening the waiting time for this process. The number of the fifth electric push rod 29 and the rack 30 is two, and the two spur gears 31 are respectively engaged with the two racks 30. The fifth electric push rod 29 can drive the rack 30 to move horizontally, so as to drive the spur gear 31 to rotate, which is convenient for adjusting the inclination angle of the air knife 32, so as to adjust the blowing angle, which is convenient for making the coverage range of the low-temperature and high-speed air flow wider and cooling the paint surface faster.

[0025] On the top of the third support frame 4 near the second support frame 3, an electrostatic dust removal rod 5 is fixedly installed. The electrostatic dust removal rod 5 is a well-known prior art, so it will not be elaborated here. When the cooled board passes under the electrostatic dust removal rod 5, the electrostatic dust removal rod 5 can remove the dust on the paint surface of the board, thus preventing the dust from scattering on the paint surface and affecting the secondary painting. In the middle of the top end of the third support frame 4, a four-way adjustment mechanism is provided. The four-way adjustment mechanism includes a third lead screw 33, a fourth motor 34, a support plate 35, and a sixth electric push rod 36. The third lead screw 33 is horizontally rotatably connected to the top of the third support frame 4 and is connected to the output end of the fourth motor 34 through a spline. The fourth motor 34 is fixedly installed on the side of the third support frame 4. A guide rod 37 is fixedly connected to the top of the third support frame 4, and one side of the support plate 35 is sleeved outside the guide rod 37 while the other side is drivingly connected to the outside of the third lead screw 33. When the fourth motor 34 drives the third lead screw 33 to rotate, it can drive the support plate 35 to horizontally move along the axial direction of the third lead screw 33, so as to adjust the lateral position of the bottom floating grinding mechanism and the dust suction mechanism. The number of the sixth electric push rods 36 is two, and the fixed rods of the two sixth electric push rods 36 are respectively vertically fixedly installed on both sides of the upper surface of the support plate 35. Through the sixth electric push rod 36, the height of the floating grinding mechanism and the dust suction mechanism can be adjusted, so that the bottom of the floating grinding mechanism fits the paint surface.

[0026] At the movable end of the bottom of the four-way adjustment mechanism, a floating grinding mechanism for removing the convex points on the paint surface is provided. The floating grinding mechanism includes a lifting frame 38, a rotating shaft 39, a ceramic abrasive belt 40, and a fifth motor 41. The lifting frame 38 is fixedly installed at the bottom of the movable rod of the sixth electric push rod 36, and auxiliary rods are fixedly connected to the four corners of its upper surface. All four auxiliary rods pass through the four corners of the support plate 35. Rotating shafts 39 are rotatably connected to both sides inside the lifting frame 38, and the ceramic abrasive belt 40 is drivingly connected to the outside of the two rotating shafts 39. The fifth motor 41 is fixedly installed on the side of the lifting frame 38, and the output end is connected to one of the rotating shafts 39 through a spline. When the fifth motor 41 drives the rotating shaft 39 connected to it to rotate, it can make the ceramic abrasive belt 40 outside it rotate at a high speed, so as to grind the convex points on the paint surface.

[0027] On one side of the floating grinding mechanism close to the electrostatic dust removal rod 5, there is a dust suction mechanism that can absorb dust in a timely manner. The dust suction mechanism includes a negative pressure dust suction exhaust pipe 42 and a shunt telescopic negative pressure pipe 43. The negative pressure dust suction exhaust pipe 42 is fixedly connected to one side of the lifting frame 38 close to the electrostatic dust removal rod 5, and the air inlet end of the negative pressure dust suction exhaust pipe 42 is inclined and corresponds to the lower surface of the ceramic abrasive belt 40. A laser rangefinder 19 is fixedly installed in the middle of the side of the negative pressure dust suction exhaust pipe 42 away from the lifting frame 38. The shunt end of the shunt telescopic negative pressure pipe 43 is fixedly connected to the air outlet end at the top of the negative pressure dust suction exhaust pipe 42 and is communicated with its interior. The top of the shunt telescopic negative pressure pipe 43 penetrates through the upper surface of the third support frame 4 and is communicated with an external negative pressure pipeline. The four-way adjustment structure can adjust the ceramic abrasive belt 40 to the position where it fits the upper surface of the paint surface through the laser rangefinder 19 on the negative pressure dust suction exhaust pipe 42. The grinding depth is less than 5 μm, only the convex points on the paint surface are removed. At the same time, the fifth motor 41 is operated to make the lower surface of the ceramic abrasive belt 40 rotate towards the negative pressure dust suction exhaust pipe 42, and a negative pressure suction force is generated in the negative pressure dust suction exhaust pipe 42 by the external negative pressure pipeline. The sheet material is driven to move backward at a constant speed by the conveying mechanism 6. The high-speed rotating ceramic abrasive belt 40 can grind the convex points on the paint surface to ensure the flatness of the paint surface. The dust generated by grinding will enter the negative pressure dust suction exhaust pipe 42 under the drive of the ceramic abrasive belt 40. At the same time, the negative pressure suction force generated in the negative pressure dust suction exhaust pipe 42 will also suck the dust into its interior, so that the dust can be fully recovered, avoiding adhering to the paint surface and ensuring good adhesion of the subsequent paint material.

[0028] The electrostatic dust removal rod 5, the first motor 601, the first electric push rod 704, the second motor 9, the third motor 12, the second electric push rod 15, the laser rangefinder 19, the third electric push rod 20, the micro vibration motor 24, the infrared lamp 25, the temperature sensor 26, the fourth electric push rod 27, the fifth electric push rod 29, the fourth motor 34, the sixth electric push rod 36 and the fifth motor 41 are all electrically connected to an external control unit and are all electrically connected to an external circuit through wires.

[0029] A processing method for a sheet material surface painting device used in furniture processing includes the following steps: I. Move the sheet material fixing mechanism 7 to the end close to the first motor 601 through the conveying mechanism 6, and then place the sheet material to be painted on the sheet material fixing mechanism 7. The sheet material fixing mechanism 7 can clamp and fix the sheet material, and then drive the sheet material to move backward at a constant speed through the conveying mechanism 6; II. After the sheet moves below the preheating pipe 44, the preheating pipe 44 blows hot air at a set temperature onto the upper surface of the sheet to preheat the surface of the sheet, thereby enhancing the adhesion of the paint. When the sheet completely moves below the first support frame 2, the conveying mechanism 6 is controlled to pause. Then, based on the measurement data of the laser rangefinder 19, the spatial movement mechanism is controlled to adjust the height of the double-stage floating scraper mechanism so that the distance between the bottom end of the double-stage floating scraper mechanism and the upper surface of the sheet is maintained between 0.5 mm and 1.5 mm. Paint is injected into the paint scraper 17 through an external paint injection pipe to ensure that the paint output of each flow equalizing hole is consistent. At the same time, the micro vibration motor 24 is operated to cause the double-layer polyurethane scraper 23 to generate high-frequency micro vibrations, prevent paint accumulation, and improve the leveling property. Meanwhile, the spatial movement mechanism is used to control the double-stage floating scraper mechanism to horizontally move uniformly in the direction opposite to the movement direction of the sheet to initially paint the sheet. III. After the double-stage floating scraper mechanism completely paints the upper surface of the sheet driven by the spatial movement mechanism, the conveying mechanism 6 drives the sheet to continue moving backward. After the sheet enters below the second support frame 3, the adaptive curing mechanism can heat and cure the paint film surface on the sheet to prevent sagging. Moreover, the adaptive curing mechanism can control the temperature in zones, facilitating dynamic adjustment of the heating temperature according to the temperature of each part of the sheet to prevent overheating and cracking. After the heating of the paint film is completed, the height and blowing angle of the air cooling mechanism can be adjusted to ensure that the air flow completely covers the paint surface of the sheet, and low-temperature and high-speed air flow is blown onto the paint surface of the sheet to reduce the temperature of the paint film to 25°C within 60 seconds, which can greatly reduce the interlayer waiting time. IV. After the paint surface of the sheet is cured and cooled, the conveying mechanism 6 drives the sheet to continue moving backward. The electrostatic dust removal rod 5 on the third support frame 4 operates to remove the dust adhesion between layers. At the same time, the floating grinding mechanism is operated, and based on the laser rangefinder 19 on the side of the negative pressure dust suction exhaust pipe 42, the lower surface of the floating grinding mechanism is adjusted to the position that fits the paint surface to grind the paint surface and remove the convex points on the paint surface. The dust suction mechanism can collect the dust generated during grinding and immediately recycle the dust. After the floating grinding mechanism finishes grinding the corresponding paint surface, the horizontal position of the floating grinding mechanism is adjusted through the four-way adjustment mechanism to make it correspond to the unground area of the paint surface. Then, the conveying mechanism 6 is used to move the sheet back to the position corresponding to the electrostatic dust removal rod 5 again and move backward at a constant speed, so that the floating grinding mechanism grinds the unground part. The above operation is repeated until the entire paint surface of the sheet is ground once. Thus, a complete painting process is completed. V. Then, the conveying mechanism 6 drives the sheet to return to the initial position and continues to repeat the above steps I to IV to repeatedly paint the sheet multiple times according to the final required paint thickness.

[0030] The above description is only for the purpose of illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various equivalent forms that conform to the idea of the present invention are within the protection scope of the present invention.

Claims

1. A paint brushing device for the surface of a board used in furniture processing, comprising a conveyor line (1), a first support frame (2), a second support frame (3) and a third support frame (4), characterized in that, A moving platform capable of driving the movement of the board is provided at the top of the conveyor line (1). The first support frame (2), the second support frame (3) and the third support frame (4) are all fixedly installed on the top of the conveyor line (1). A spatial movement mechanism is provided at the top end of the first support frame (2), and a double-stage floating scraping knife mechanism capable of painting the board is provided at the moving end of the spatial movement mechanism. A preheating pipe (44) capable of preheating the board is fixedly installed on one side of the first support frame (2) away from the second support frame (3). An adaptive curing mechanism capable of curing the paint surface of the board is provided on the inner top wall of the second support frame (3), and an air-cooling mechanism capable of quickly cooling the paint surface is provided on one side of the interior away from the first support frame (2). An electrostatic dust removal rod (5) is fixedly installed at the top of the third support frame (4) close to one side of the second support frame (3). A four-way adjustment mechanism is provided in the middle of the top end of the third support frame (4), and a floating grinding mechanism capable of removing the bumps on the paint surface is provided at the moving end of the bottom of the four-way adjustment mechanism. A dust suction mechanism capable of timely absorbing dust is provided on one side of the floating grinding mechanism close to the electrostatic dust removal rod (5).

2. The paint brushing device for the surface of a board used in furniture processing according to claim 1, characterized in that, The moving platform is composed of a transmission mechanism (6) and a board fixing mechanism (7). The transmission mechanism (6) includes a first motor (601), a pulley shaft (602) and a belt (603). The number of the pulley shafts (602) is two, and the two pulley shafts (602) are respectively rotatably connected to both sides of the top of the conveyor line (1). The output end of the first motor (601) is connected to one of the pulley shafts (602) through a spline. Both sides of the two pulley shafts (602) are drivingly connected with a belt (603); The board fixing mechanism (7) includes a connecting block (701), a moving plate (702), a clamping frame (703) and a first electric push rod (704). Connecting blocks (701) are fixedly connected to the four corners of the lower surface of the moving plate (702), and the connecting blocks (701) on both sides are fixedly connected to the upper surface of the corresponding belt (603). Clamping frames (703) arranged symmetrically are horizontally penetrated through both sides of the moving plate (702), and first electric push rods (704) are fixedly installed in the middle of both sides of the lower surface of the moving plate (702). The movable rod ends of the two first electric push rods (704) are respectively fixedly connected to the middle of one end of the two clamping frames (703) close to each other.

3. A paint brushing device for the surface of a wood board used in furniture processing according to claim 1, characterized in that, The space activity mechanism includes a first lead screw (8), a second motor (9), a lateral moving frame (10), a second lead screw (11) and a third motor (12). The number of the first lead screws (8) is two, and the two first lead screws (8) are respectively horizontally rotatably connected to both sides of the top of the first support frame (2). The same ends of the two first lead screws (8) are drivingly connected by a transmission belt, and the output end of the second motor (9) is connected to one of the first lead screws (8) through a spline. Both ends of the lateral moving frame (10) are drivingly connected to the outside of the two first lead screws (8), and the second lead screw (11) is horizontally rotatably connected to the inside of the lateral moving frame (10). The second lead screw (11) is perpendicular to the two first lead screws (8). The output end of the third motor (12) is connected to the second lead screw (11) through a spline. The space activity mechanism further includes a lead screw slider (13), a horizontal fixing plate (14) and a second electric push rod (15). The lead screw slider (13) is drivingly connected to the outside of the second lead screw (11) and fixedly connected with the horizontal fixing plate (14) at the bottom. Second electric push rods (15) are vertically and fixedly installed on both sides of the upper surface of the horizontal fixing plate (14), and the movable rods of the two second electric push rods (15) penetrate below the horizontal fixing plate (14).

4. A paint-brushing device for the surface of a board used in furniture processing according to claim 3, characterized in that, The double-stage floating paint scraping mechanism includes a tool holder (16), a paint scraper (17) and a paint injection pipe (18). The tool holder (16) is fixedly connected to the bottom of the movable rods of the two second electric push rods (15), and the paint scraper (17) is fixedly connected to the lower surface of the tool holder (16) in an inclined state. A paint distribution cavity capable of storing paint is arranged inside the paint scraper (17), and a plurality of flow equalizing holes are horizontally and equidistantly arranged at the bottom end. The outlet end of the paint injection pipe (18) is fixedly connected to the upper surface of the paint scraper (17) and communicated with the paint distribution cavity inside it. The inlet end of the paint injection pipe (18) penetrates through the upper surface of the tool holder (16) and is communicated with an external paint conveying pipeline. A laser rangefinder (19) vertically downward is fixedly installed in the middle of the top end of the paint scraper (17).

5. A paint brushing device for the surface of a board used in furniture processing according to claim 4, characterized in that, The double-stage floating paint scraping mechanism further includes third electric push rods (20), a connecting plate (21), springs (22), a double-layer polyurethane paint scraper (23) and a micro vibration motor (24). The number of the third electric push rods (20) is two, and the two third electric push rods (20) are respectively horizontally and fixedly installed on both sides of the lower surface of the tool holder (16). The connecting plate (21) is fixedly connected to the ends of the movable rods of the two third electric push rods (20). The number of the springs (22) is several, and several springs (22) are equidistantly fixedly connected to the lower surface of the connecting plate (21). The double-layer polyurethane paint scraper (23) is fixedly connected to the bottom ends of the several springs (22). The micro vibration motor (24) is fixedly installed in the middle of the upper surface of the double-layer polyurethane paint scraper (23). The bottom end of the double-layer polyurethane paint scraper (23) is at the same horizontal plane as the bottom end of the paint scraper (17) and they have the same width.

6. A paint brushing device for the surface of a board used in furniture processing according to claim 1, characterized in that, The adaptive curing mechanism includes infrared lamps (25) and temperature sensors (26). The number of the infrared lamps (25) is several, and the several infrared lamps (25) are fixedly installed at equal intervals on the inner top wall of the second support frame (3). A temperature sensor (26) is arranged between every two adjacent infrared lamps (25) in the same row, and the several temperature sensors (26) are fixedly installed on the top of the second support frame (3) with their detection directions all vertically downward.

7. A paint brushing device for the surface of a board used in furniture processing according to claim 1, characterized in that, The air-cooling mechanism includes a fourth electric push rod (27), a fixed frame (28), a fifth electric push rod (29), a rack (30), spur gears (31) and an air knife (32). The fixed rod body of the fourth electric push rod (27) is vertically fixedly installed on one side of the upper surface of the second support frame (3) away from the first support frame (2). The fixed frame (28) is fixedly connected to the bottom of the movable rod body of the fourth electric push rod (27), and the fixed rod body of the fifth electric push rod (29) is horizontally fixedly installed on the side surface of the fixed frame (28). A laser rangefinder (19) is fixedly installed in the middle of the side of the fixed frame (28) close to the fifth electric push rod (29). The rack (30) is fixedly connected to the end of the movable rod body of the fifth electric push rod (29) and horizontally penetrates below the fixed frame (28). The number of the spur gears (31) is two, and the two spur gears (31) are respectively fixedly connected to both sides of the upper surface of the air knife (32), and both sides of the two spur gears (31) and the air knife (32) are rotatably connected to the bottom of the fixed frame (28). The air inlet end of the air knife (32) is communicated with an external air supply pipeline. The number of the fifth electric push rod (29) and the rack (30) is two, and the two spur gears (31) are respectively meshed with the two racks (30).

8. A paint brushing device for the surface of a board used in furniture processing according to claim 1, characterized in that, The four-way adjustment mechanism includes a third lead screw (33), a fourth motor (34), a support plate (35) and a sixth electric push rod (36). The third lead screw (33) is horizontally rotatably connected to the top of the third support frame (4) and is connected to the output end of the fourth motor (34) through a spline. The fourth motor (34) is fixedly installed on the side surface of the third support frame (4). A guide rod (37) is fixedly connected to the top of the third support frame (4), and one side of the support plate (35) is sleeved outside the guide rod (37) while the other side is drivingly connected to the outside of the third lead screw (33). The number of the sixth electric push rod (36) is two, and the fixed rod bodies of the two sixth electric push rods (36) are respectively vertically fixedly installed on both sides of the upper surface of the support plate (35).

9. A paint brushing device for the surface of a board used in furniture processing according to claim 8, characterized in that, The floating grinding mechanism includes a lifting frame (38), a rotating shaft (39), a ceramic abrasive belt (40), and a fifth motor (41). The lifting frame (38) is fixedly installed at the bottom of the movable rod body of the sixth electric push rod (36), and auxiliary rods are fixedly connected to the four corners of its upper surface. All four auxiliary rods pass through the four corners of the support plate (35). Both sides inside the lifting frame (38) are rotatably connected with a rotating shaft (39), and the ceramic abrasive belt (40) is drivingly connected to the outside of the two rotating shafts (39). The fifth motor (41) is fixedly installed on the side of the lifting frame (38), and the output end is connected to one of the rotating shafts (39) through a spline; the dust suction mechanism includes a negative pressure dust suction exhaust pipe (42) and a shunt telescopic negative pressure pipe (43). The negative pressure dust suction exhaust pipe (42) is fixedly connected to one side of the lifting frame (38) close to the electrostatic dust removal rod (5), and the air inlet end of the negative pressure dust suction exhaust pipe (42) is inclined and corresponds to the lower surface of the ceramic abrasive belt (40). A laser rangefinder (19) is fixedly installed in the middle of the side of the negative pressure dust suction exhaust pipe (42) away from the lifting frame (38). The shunt end of the shunt telescopic negative pressure pipe (43) is fixedly connected to the air outlet end at the top of the negative pressure dust suction exhaust pipe (42) and is communicated with its inside. The top of the shunt telescopic negative pressure pipe (43) passes through the upper surface of the third support frame (4) and is communicated with an external negative pressure pipeline.

10. A processing method of a paint brushing device for the surface of a wood-based panel used in furniture processing according to any one of claims 1-9, characterized in that, It includes the following steps:

1. Move the plate fixing mechanism (7) to the end near the first motor (601) through the conveying mechanism (6), then place the plate to be painted on the plate fixing mechanism (7). The plate fixing mechanism (7) can clamp and fix the plate, and then drive the plate to move backward at a constant speed through the conveying mechanism (6); 2. When the plate moves below the preheating pipe (44), the preheating pipe (44) will blow hot air at a set temperature on the upper surface of the plate to preheat the surface of the plate, thereby improving the adhesion of the paint. When the plate completely moves below the first support frame (2), control the conveying mechanism (6) to pause, and then control the spatial movement mechanism to adjust the height of the double-stage floating scraper mechanism according to the measurement data of the laser rangefinder (19), so that the distance between the bottom end of the double-stage floating scraper mechanism and the upper surface of the plate is maintained between 0.5 mm and 1.5 mm. Inject paint into the paint scraper (17) through an external paint injection pipe to make the paint output of each flow equalizing hole consistent, and operate the micro vibration motor (24) to make the double-layer polyurethane scraper (23) generate high-frequency micro vibrations, prevent paint accumulation, and improve the leveling property. At the same time, control the double-stage floating scraper mechanism to move horizontally at a constant speed in the direction opposite to the movement direction of the plate through the spatial movement mechanism to perform preliminary painting on the plate; III. After the double-stage suspension scraper mechanism is driven by the spatial activity mechanism to completely brush the upper surface of the board with paint, the conveyor mechanism (6) drives the board to continue moving backward. After the board enters below the second support frame (3), the adaptive curing mechanism can heat and cure the surface of the paint film on the board, prevent sagging, and the adaptive curing mechanism can control the temperature in zones, facilitating dynamic adjustment of the heating temperature according to the temperature of each part of the board to prevent overheating and cracking. After the heating of the paint film is completed, the height and blowing angle of the air-cooling mechanism can be adjusted to ensure that the airflow completely covers the paint surface of the board, blowing low-temperature and high-speed airflow on the paint surface of the board, and reducing the temperature of the paint film to 25°C within 60 seconds, which can greatly reduce the interlayer waiting time; IV. After the paint surface of the board is cured and cooled down, the conveyor mechanism (6) drives the board to continue moving backward. The electrostatic dust removal rod (5) on the third support frame (4) operates to remove the dust adhered between layers. At the same time, the floating grinding mechanism operates, and according to the laser rangefinder (19) on the side of the negative pressure dust suction exhaust pipe (42), the lower surface of the floating grinding mechanism is adjusted to the position that fits the paint surface to grind the paint surface and remove the convex points on the paint surface, while the dust suction mechanism can collect the dust from the ground part and recycle the dust immediately. After the floating grinding mechanism finishes grinding the corresponding paint surface, the horizontal position of the floating grinding mechanism is adjusted through the four-way adjustment mechanism to make it correspond to the unground area of the paint surface, and the board is returned to the position corresponding to the electrostatic dust removal rod (5) through the conveyor mechanism (6) and then moves backward at a constant speed again, so that the floating grinding mechanism grinds the unground part. Repeat the above operation until the entire paint surface of the board is ground once; thus, a complete painting process is completed. V. Then, the conveyor mechanism (6) drives the board to return to the initial position and continues to repeat the above steps I to IV to paint the board multiple times according to the final required paint thickness.

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