A circuit board coating machine and coating process

Abstract

The present invention relates to the technical field of circuit board coating, and in particular to a circuit board coating machine and a coating process. A circuit board coating machine includes a support leg, a bracket, a conveyor belt, a protrusion, a liquid storage tank, a cleaning nozzle and a cleaning component. A bracket is installed on the top of the support leg, and the conveyor belt is rotatably arranged between the brackets. The conveyor belt is evenly spaced with protrusions, and longitudinal protrusions are arranged at both ends of the top of the protrusions. A liquid storage tank is arranged at the protruding position of the top of the bracket, and the bottom of the liquid storage tank is connected to a cleaning nozzle for spraying and cleaning the surface of the circuit board. When the conveyor belt drives the circuit board to move under the cleaning roller, the cleaning roller and the surface of the circuit board are frictionally matched. With the movement of the conveyor belt, the surface of the circuit board is wiped and cleaned by the friction between the cleaning roller and the surface of the circuit board. At the same time, the solution on the surface of the circuit board is adsorbed, so as to achieve the effect of thoroughly cleaning the surface of the circuit board and synchronously removing the solution residue on the surface of the circuit board.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board coating, and in particular to a circuit board coating machine and a coating process. Background Art

[0002] Circuit board coater is a key equipment used in electronic manufacturing to evenly coat conductive, insulating or functional films on circuit boards (PCBs) to meet specific performance requirements of circuit boards, such as electrical insulation, corrosion resistance, etc.

[0003] Before coating, the circuit board must be thoroughly cleaned to remove grease, fingerprints, dust, oxides and other contaminants on the surface. The existing cleaning methods are mostly manual cleaning or spraying solvent cleaning liquid on the surface of the circuit board through spray equipment. The efficiency of manual cleaning is low. Although the spray cleaning method using spray equipment improves the cleaning efficiency, for pollutants with strong adsorption capacity, relying solely on spray cleaning has the defects of incomplete cleaning and residual solvent after spray cleaning.

[0004] Based on this, it is necessary to design a circuit board coating machine and coating process that can thoroughly clean the circuit board and remove solvent residues. Summary of the invention

[0005] The technical implementation scheme of the present invention is as follows: a circuit board coating machine includes a support leg, a bracket, a conveyor belt, a convex block, a longitudinal convex rod, a liquid storage tank, a cleaning nozzle and a cleaning component. The support leg is installed on the top of the support leg, the conveyor belt is rotatably arranged on the bracket, the conveyor belt is evenly spaced with convex blocks, longitudinal convex rods are arranged at both ends of the top of the convex block, a liquid storage tank is arranged at the protruding position of the top of the bracket, the bottom of the liquid storage tank is connected to a cleaning nozzle for spraying and cleaning the surface of the circuit board, and a cleaning component for wiping and cleaning the surface of the circuit board is arranged on the top of the bracket. The cleaning component includes a cylinder, a 7-shaped frame, a rotating rod, a cleaning nozzle ... The cleaning roller comprises a roller and a transverse convex rod, a collecting frame is arranged on the outer wall of one side of the bracket, a cylinder is arranged on the other side of the bracket and the collecting frame, a 7-shaped frame is connected to the end of the movable end of the cylinder piston rod, a rotating rod is connected to the end of the 7-shaped frame away from the cylinder piston rod, a cylindrical cleaning roller is connected between the rotating rods, protrusions that frictionally cooperate with the surface of the circuit board are evenly arranged on the outer circumferential wall of the cleaning roller, transverse convex rods are evenly arranged on both ends of the cleaning roller along the circumference thereof, the longitudinal convex rods squeeze the transverse convex rods to drive the cleaning roller to rotate, and a scraping component for scraping contaminants on the surface of the cleaning roller is slidably arranged on the cleaning roller.

[0006] More preferably, the scraping assembly includes a scraping frame, a gear, a rack, a T-shaped frame, a quadrilateral connecting frame, an electric screw and two guide rods. A gear is connected to a rotating rod, an eccentric part of the gear is connected to the T-shaped frame, the rack arranged on the top of the bracket is meshed with the gear, and a quadrilateral connecting frame with a notch at one corner is connected to the other rotating rod. The corner of the quadrilateral connecting frame opposite to the notch is rotatably connected to the rotating rod, and the other two opposite corners of the quadrilateral connecting frame are respectively connected to the electric screw and the two guide rods, and the ends of the electric screw and the two guide rods away from the quadrilateral connecting frame are connected to the T-shaped frame, and the scraping frame mounted on the outside of the cleaning roller is movably connected to the electric screw and the two guide rods.

[0007] More preferably, it also includes a discharge baffle, a guide rod three, a spring one and a push rod. The bottom of the scraper frame accommodating chamber is arranged as an inclined surface and has a discharge port. No less than two guide rods three are arranged on the outer wall of the bottom of the scraper frame accommodating chamber. A discharge baffle for sealing the liquid discharge port is slidably arranged between the guide rods three. A spring one is arranged between the discharge baffle and the end of the guide rod three. The two ends of the notch of the quadrilateral connecting frame are commonly connected with a push rod that is squeezed and matched with the discharge baffle.

[0008] More preferably, the number of teeth on the rack is half the number of teeth on the gear.

[0009] More preferably, it also includes a feeding box, a threaded rod, a guide rod and an adjusting nut. The feeding box is movably arranged on the top of the bracket through the threaded rod and the guide rod. The bottom of the feeding box is arranged as an opening for facilitating the loading of circuit boards. The feeding box is located above the conveyor belt, and the threaded rod is threadedly connected with an adjusting nut for fixing the feeding box.

[0010] More preferably, the bracket is also provided with a coating component for coating the circuit board, the coating component comprising a mounting seat, a coating roller, a material guide rack, an electric bidirectional screw, a paint feeding frame, a paint storage box, four guide rods, a sealing baffle, two springs and a pulley assembly. The bracket is symmetrically provided with mounting seats on both sides centered on the conveyor belt, a coating roller is rotatably arranged between the mounting seats, a material guide rack and an electric bidirectional screw are parallelly arranged on the upper part of the mounting seats, a pulley assembly is arranged between the electric bidirectional screw and the coating roller, a paint feeding frame is movably arranged between the material guide rack and the electric bidirectional screw, a paint storage box is installed on one side of the bracket, a paint outlet is opened at the bottom of the paint storage box, the paint feeding frame is arranged below the paint outlet of the paint storage box, a sealing baffle for sealing the paint outlet of the paint storage box is slidably provided on the four guide rods installed at the bottom of the paint storage box, two springs are arranged between the end of the four guide rods and the sealing baffle, when the paint feeding frame squeezes the sealing baffle, the paint in the paint storage box falls into the paint feeding frame through the paint outlet.

[0011] More preferably, a dryer for drying the paint on the circuit board is installed on the bracket.

[0012] More preferably, a scraper assembly for scraping off paint on the bumps is provided at the bottom of the bracket, and the scraper assembly includes an inverted T-shaped rod, a scraper plate and spring three. Inverted T-shaped rods are provided on both sides of the bottom of the bracket centered on the conveyor belt, and a scraper plate is slidably connected to the inverted T-shaped rod, and spring three is provided between the scraper plate and the bracket.

[0013] A circuit board coating process, which is applicable to the circuit board coating machine described above, comprises the following steps:

[0014] S1: Load the circuit boards into the loading box and stack them from bottom to top. When the conveyor moves to the left, the convex block pushes the circuit board at the bottom of the loading box to move along the conveyor. Similarly, the circuit boards are loaded from the loading box to the conveyor one by one.

[0015] S2: Spray the cleaning solvent in the liquid storage tank onto the circuit board through the cleaning nozzle;

[0016] S3: Wipe and clean the surface of the circuit board with a cleaning roller;

[0017] S4: Through the telescopic function of the cylinder piston rod, the gear and the rack are driven to engage, so that the cleaning roller, the scraper frame and the quadrilateral connecting frame are rotated 180 degrees around the rotating rod;

[0018] S5: The scraping frame is driven by an electric screw to move horizontally, so as to scrape and clean the surface of the cleaning roller;

[0019] S6: The paint feeding frame is driven to move horizontally by an electric bidirectional screw, and the paint feeding frame is squeezed and matched with the sealing baffle, so that the paint in the paint storage box is fed into the paint feeding frame, and the paint is fed onto the coating roller by the horizontal movement of the paint feeding frame, and the coating operation is performed on the surface of the circuit board by the coating roller;

[0020] S7: Drying the surface of the circuit board after the coating operation is completed by a dryer;

[0021] S8: The paint on the bump is scraped off by squeezing the scraper plate and the bump.

[0022] Compared with the prior art, the present invention has the following advantages: 1. When the conveyor belt drives the circuit board to move under the cleaning roller, the cleaning roller and the surface of the circuit board are frictionally matched. As the conveyor belt moves, the surface of the circuit board is wiped and cleaned by the friction between the cleaning roller and the surface of the circuit board. At the same time, the solution on the surface of the circuit board is adsorbed, thereby achieving the effect of thoroughly cleaning the surface of the circuit board and simultaneously removing the solution residue on the surface of the circuit board.

[0023] 2. The cylinder piston rod extends upward, and the 7-shaped frame drives the gear to move upward. Through the cooperation of the gear and the rack, the gear moves upward to drive the scraping frame and the electric screw connected to the scraping frame, the second guide rod, and the quadrilateral connecting frame connected to the electric screw and the second guide rod to rotate 180 degrees clockwise with the rotating rod as the center. The scraping frame is then driven by the electric screw to move horizontally along the second guide rod. The scraping frame can scrape the pollutants on the raised surface of the cleaning roller, and the scraped pollutants fall into the collection frame, thereby realizing the function of cleaning the surface of the cleaning roller, thereby ensuring the cleaning effect of the cleaning roller on the surface of the circuit board.

[0024] 3. The electric bidirectional screw drives the paint feeding frame to move horizontally along the guide frame to the bottom of the paint storage box. The sealing baffle is squeezed by the paint feeding frame to make the sealing baffle slide horizontally along the four guide rods, and the sealing baffle is released from blocking the discharge port of the paint storage box. The paint in the paint storage box falls into the paint feeding frame, and the paint is applied to the coating roller through the paint feeding frame. The coating roller evenly applies the paint to the circuit board during the rotation movement. The electric bidirectional screw drives the paint feeding frame to reciprocate, so that the paint in the paint storage box is continuously fed to the coating roller, thereby achieving the effect of continuous coating of the circuit board by the coating roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0026] Figure 2 It is a three-dimensional structural schematic diagram of components such as a conveyor belt, a loading box, and a cleaning nozzle in a cross-sectional state of the bracket of the present invention.

[0027] Figure 3 It is a three-dimensional structural schematic diagram of the components such as the support, conveyor belt, and cleaning assembly of the present invention.

[0028] Figure 4 It is a partial three-dimensional structural schematic diagram from the first perspective of the cleaning component and the scraping component of the present invention when the cylinder piston rod is in a retracted state.

[0029] Figure 5 It is a partial three-dimensional structural schematic diagram from a second perspective of the cleaning component and the scraping component of the present invention when the cylinder piston rod is in a retracted state.

[0030] Figure 6 It is a partial three-dimensional structural schematic diagram from a second perspective of the cleaning component and the scraping component of the present invention when the cylinder piston rod is extended upward.

[0031] Figure 7 It is a partial three-dimensional structural schematic diagram from a first perspective of the cleaning component and the scraping component of the present invention when the cylinder piston rod is extended upward.

[0032] Figure 8It is a schematic diagram of the three-dimensional structure of the scraping frame of the present invention in a cross-sectional state.

[0033] Fig. 9 It is a schematic diagram of the partial three-dimensional structure of the coating component at the first viewing angle of the present invention.

[0034] Fig.10 It is a schematic diagram of the partial three-dimensional structure of the coating component under the second viewing angle of the present invention.

[0035] Fig.11 It is a schematic diagram of the three-dimensional structure of the scraper assembly of the present invention.

[0036] Among them, the above-mentioned drawings include the following figure marks: 1, support foot, 2, bracket, 21, threaded rod, 22, guide rod 1, 23, collection frame, 3, conveyor belt, 31, convex block, 32, longitudinal convex rod, 4, feeding box, 41, adjusting nut, 5, liquid storage tank, 51, cleaning nozzle, 6, cleaning component, 61, cylinder, 62, 7-shaped frame, 63, rotating rod, 64, cleaning roller, 65, transverse convex rod, 7, scraping component, 70, scraping frame, 71, gear, 72, rack, 73, T-shaped frame, 74, quadrilateral connection Connecting frame, 741, push rod, 75, electric screw, 76, guide rod two, 77, discharge baffle, 771, guide rod three, 772, spring one, 8, coating assembly, 80, mounting seat, 81, coating roller, 82, guide rack, 83, electric bidirectional screw, 84, paint feeding frame, 85, paint storage box, 86, guide rod four, 87, sealing baffle, 88, spring two, 89, pulley assembly, 9, dryer, 10, scraper assembly, 101, inverted T-shaped rod, 102, scraper plate, 103, spring three. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment: A circuit board coating machine, such as Figure 1-Figure 5As shown, it includes a support leg 1, a bracket 2, a conveyor belt 3, a convex block 31, a longitudinal convex rod 32, a liquid storage tank 5, a cleaning nozzle 51 and a cleaning assembly 6. The bracket 2 is installed on the top of the support leg 1. A cylindrical transmission shaft is arranged between the inner walls of the front and rear parts of the left and right sides of the bracket 2. The conveyor belt 3 is arranged between the two cylindrical transmission shafts and a driving motor for driving the cylindrical transmission shaft to rotate is arranged on the bracket 2. The conveyor belt 3 is evenly spaced with convex blocks 31, and longitudinal convex rods 32 are arranged at both ends of the top of the convex blocks 31. According to design requirements, longitudinal convex rods 32 are arranged at both ends of each convex block 31, or the longitudinal convex rods 32 are arranged at even intervals. A plurality of protrusions 31 are evenly selected to install longitudinal protrusions 32, a liquid storage tank 5 is arranged at a protruding position on the top of the bracket 2, and a cleaning nozzle 51 for spraying and cleaning the surface of the circuit board is connected to the bottom of the liquid storage tank 5, and a cleaning assembly 6 for wiping and cleaning the surface of the circuit board is arranged on the top of the bracket 2, and the cleaning assembly 6 includes a cylinder 61, a 7-shaped frame 62, a rotating rod 63, a cleaning roller 64 and a transverse protrusion 65, a collection frame 23 is arranged on the outer wall of the front side of the bracket 2, and a cylinder 61 is arranged on the rear side of the bracket 2 and the collection frame 23, and the end of the movable end of the piston rod of the cylinder 61 is connected to the 7-shaped frame 62, 7 The ends of the frame 62 away from the piston rod of the cylinder 61 are connected to the rotating rod 63, and the rotating rods 63 are commonly connected to the cylindrical cleaning roller 64. The outer circumferential wall of the cleaning roller 64 is evenly spaced with protrusions that rub against the surface of the circuit board. The protrusions are sponges with adsorption function. Both ends of the cleaning roller 64 are evenly spaced along the circumference thereof. Transverse convex rods 65 are arranged. The number of the transverse convex rods 65 is consistent with the number of protrusions on the outer circumferential wall of the cleaning roller 64. The longitudinal convex rods 32 squeeze the transverse convex rods 65 to drive the cleaning roller 64 to rotate. When a pair of longitudinal convex rods 32 are from below the cleaning roller 64, the cleaning roller 64 is rotated. When passing through, the longitudinal protrusion 32 squeezes the transverse protrusion 65 to make the cleaning roller 64 rotate a certain angle, and the protrusion on the cleaning roller 64 that is in the same line as the transverse protrusion 65 rotates a certain angle with the cleaning roller 64. When the protrusion rotates, it comes into friction contact with the circuit board below it and drives the circuit board away from the protrusion along the movement trajectory of the conveyor belt 3. In this way, a protrusion on the cleaning roller 64 only frictionally cooperates with one circuit board, thereby achieving the effect of cleaning the surface of the circuit board. A scraping component 7 for scraping off contaminants on the surface of the cleaning roller 64 is slidably provided on the cleaning roller 64.

[0039] like Figure 4-Figure 7As shown, the scraping assembly 7 includes a scraping frame 70, a gear 71, a rack 72, a T-shaped frame 73, a quadrilateral connecting frame 74, an electric screw 75 and a guide rod 76. The rear rotating rod 63 is connected to the gear 71, and an eccentric part of the gear 71 is connected to the T-shaped frame 73. The rack 72 arranged on the top of the bracket 2 is meshed with the gear 71. The number of teeth of the rack 72 is half of the number of teeth of the gear 71. The gear 71 is meshed with the rack 72 to achieve the function of rotating half a circle of the gear 71. The front rotating rod 63 is connected to a quadrilateral connecting frame 74 with a missing corner. The quadrilateral connecting frame 74 is rotatably connected to the rotating rod 63 at a corner opposite to the notched corner, and the other two opposite corners of the quadrilateral connecting frame 74 are respectively connected to electric screws. The movable screw 75 and the second guide rod 76, the electric screw 75 and the second guide rod 76 are arranged in parallel, and the electric screw 75 and the second guide rod 76 are connected to the T-shaped frame 73 at one end away from the quadrilateral connecting frame 74, wherein the electric screw 75 is rotatably connected to the T-shaped frame 73, and the second guide rod 76 is fixedly connected to the T-shaped frame 73. The electric screw 75 includes a screw and a servo motor for driving the screw to rotate. The scraping frame 70 sleeved on the outside of the cleaning roller 64 is threadedly connected to the electric screw 75, and the scraping frame 70 is slidably connected to the second guide rod 76. The scraping frame 70 and the protrusion on the outer wall of the cleaning roller 64 are extruded together. When the scraping frame 70 slides horizontally, the scraping frame 70 can squeeze out the liquid adsorbed on the protrusion of the cleaning roller 64.

[0040] like Figure 5-Figure 8 As shown, it also includes a discharge baffle 77, a guide rod three 771, a spring one 772 and a push rod 741. The bottom of the scraper frame 70 accommodating chamber is set as an inclined surface and has a discharge port. Two guide rods three 771 are set on the outer wall of the bottom of the scraper frame 70 accommodating chamber. A discharge baffle 77 for sealing the liquid discharge port is slidably set between the guide rods three 771. A spring one 772 is set between the discharge baffle 77 and the end of the guide rod three 771. The two ends of the notch of the quadrilateral connecting frame 74 are commonly connected with a push rod 741 that is squeezed and matched with the discharge baffle 77.

[0041] like Figure 2-Figure 3 As shown, it also includes a loading box 4, a threaded rod 21, a guide rod 22 and an adjusting nut 41. The top of the bracket 2 is movably provided with a loading box 4 through the threaded rod 21 and the guide rod 22. The bottom of the loading box 4 is arranged as an opening for facilitating the loading of circuit boards. The loading box 4 is located above the conveyor belt 3. The threaded rod 21 is threadedly connected with an adjusting nut 41 for fixing the loading box 4. The height of the loading box 4 on the threaded rod 21 is adjusted by adjusting the nut 41, so that the distance between the bottom of the loading box 4 and the conveyor belt 3 is the thickness of the circuit board, and the thickness is consistent with the height of the protrusion 31. When the protrusion 31 is at the bottom of the loading box 4, the protrusion 31 blocks the circuit board in the loading box 4. After the protrusion 31 is away from the loading box 4, the circuit board in the loading box 4 falls onto the conveyor belt 3, thereby realizing the loading of the circuit board.

[0042] When in use, the circuit board to be coated is placed in the loading box 4, and the distance between the bottom of the loading box 4 and the conveyor belt 3 is adjusted by adjusting the nut 41 and the threaded rod 21. The distance is adapted to the height of the protrusion 31. When the conveyor belt 3 drives the protrusion 31 to move to the left, the protrusion 31 moves away from the bottom of the loading box 4, and the circuit board in the loading box 4 falls downward onto the conveyor belt 3. Since the distance between the bottom of the loading box 4 and the conveyor belt 3 is adapted to the height of the protrusion 31, the circuit boards are loaded onto the conveyor belt 3 one by one; the cleaning nozzle 51 sprays the cleaning solution in the liquid storage tank 5 onto the circuit board, thereby spraying and cleaning the circuit board; then, the conveyor belt 3 moves to the left, and the circuit board is conveyed to the bottom of the cleaning roller 64. When the conveyor belt 3 drives the circuit board to pass under the cleaning roller 64, the protrusion of the cleaning roller 64 touches the surface of the circuit board The cleaning roller 64 is frictionally matched to wipe and clean the surface of the circuit board. At the same time, the protrusion of the cleaning roller 64 is a sponge with an adsorption function, so that the solution on the surface of the circuit board can be adsorbed synchronously, thereby realizing the function of effectively cleaning the surface of the circuit board; when the conveyor belt 3 drives the circuit board to move, the longitudinal protrusion 32 on the protrusion 31 is squeezed and matched with the transverse protrusions 65 at both ends of the cleaning roller 64, thereby driving the cleaning roller 64 to rotate, realizing the function of one protrusion on the outer wall of the cleaning roller 64 to wipe and clean only one circuit board surface and adsorb the residual solution, thereby achieving the effect of effectively cleaning the surface of each circuit board; when it is necessary to clean the protrusion on the cleaning roller 64, the piston rod of the cylinder 61 extends upward, and the 7-shaped frame 62 drives the gear 71 to move upward. Since the gear 71 is meshed with the rack 72, when the gear 71 moves upward, Figure 5 For example, the gear 71 moves clockwise. Since the number of teeth on the rack 72 is half of the number of teeth on the gear 71, the gear 71 rotates 180 degrees and then stops rotating. The rotation of the gear 71 drives the scraping frame 70 and the electric screw 75 connected to the scraping frame 70, the second guide rod 76, and the quadrilateral connecting frame 74 connected to the electric screw 75 and the second guide rod 76 to rotate 180 degrees clockwise around the rotating rod 63. The state after rotation is as follows Figure 6 and Figure 7 As shown, at this time, the cavity with the scraping frame 70 opening upward and containing the space is located below the cleaning roller 64, and the top rod 741 on the quadrilateral connecting frame 74 also rotates to the bottom of the rotating rod 63 (as shown in FIG. Figure 7As shown), at this time, the scraper frame 70 is driven by the electric screw 75 to move horizontally along the guide rod 2 76, and the cleaning roller 64 passes through the longitudinal circular hole of the scraper frame 70. Through the friction cooperation between the longitudinal circular hole of the scraper frame 70 and the outer wall of the cleaning roller 64, the scraper frame 70 can clean the raised surface of the cleaning roller 64. At the same time, due to the extrusion cooperation between the scraper frame 70 and the protrusion of the cleaning roller 64, the scraper frame 70 horizontally squeezes the protrusion of the cleaning roller 64, thereby squeezing out the liquid adsorbed by the protrusion of the cleaning roller 64 and dropping it into the accommodating space of the scraper frame 70. When the scraper frame 70 contacts the quadrilateral connecting frame 74, the top rod 741 squeezes the discharge baffle 77, and the discharge The baffle plate 77 moves horizontally along the guide rod three 771 and compresses the spring one 772, thereby releasing the obstruction of the discharge baffle plate 77 on the liquid discharge port of the scraper frame 70, and the liquid collected in the scraper frame 70 is discharged into the collection frame 23 through the liquid discharge port at the bottom of the scraper frame 70, thereby achieving the function of cleaning the cleaning roller 64 and squeezing out the liquid absorbed by it; the piston rod of the cylinder 61 retracts downward and resets, the gear 71 cooperates with the rack 72 to rotate the scraper frame 70 and the electric screw rod 75 connected to the scraper frame 70, the guide rod two 76 and the quadrilateral connecting frame 74 connected to the electric screw rod 75 and the guide rod two 76 counterclockwise 180 degrees around the rotating rod 63 as the center and reset to the position as shown in the figure. Figure 4 and Figure 5 state.

[0043] like Figure 1 , Fig. 9 and Fig.10As shown, the bracket 2 is also provided with a coating component 8 for coating the circuit board and a dryer 9 for drying the paint on the circuit board. The coating component 8 includes a mounting seat 80, a coating roller 81, a guide rack 82, an electric bidirectional screw 83, a paint feeding frame 84, a paint storage box 85, a guide rod four 86, a sealing baffle 87, a spring two 88 and a pulley assembly 89. The bracket 2 is symmetrically provided with mounting seats 80 on both sides centered on the conveyor belt 3. The coating roller 81 is rotatably arranged between the mounting seats 80. The guide rack 82 and the electric bidirectional screw 83 are arranged in parallel on the upper part of the mounting seat 80. The electric bidirectional screw 83 includes a bidirectional screw and a rotating motor driving the bidirectional screw to rotate. A pulley assembly 89 is arranged between the electric bidirectional screw 83 and the coating roller 81. The pulley assembly 89 includes a pulley installed at the end of the bidirectional screw, and a pulley installed at the end of the coating roller 81. The paint loading frame 84 is movably arranged between the pulley and the flat belt between the two pulleys, and the guide rack 82 and the electric bidirectional screw 83. The paint loading frame 84 is threadedly connected to the electric bidirectional screw 83, and the paint loading frame 84 is slidably connected to the guide rack 82. The discharge port of the paint loading frame 84 is located directly above the coating roller 81. A paint storage box 85 is installed on the rear side of the bracket 2, and a paint outlet is opened at the bottom of the paint storage box 85. The paint loading frame 84 is arranged below the paint outlet of the paint storage box 85, and a sealing baffle 87 for sealing the paint outlet of the paint storage box 85 is slidably arranged on the guide rod four 86 installed at the bottom of the paint storage box 85. A spring two 88 is arranged between the end of the guide rod four 86 and the sealing baffle 87. When the paint loading frame 84 squeezes the sealing baffle 87, the paint in the paint storage box 85 falls into the paint loading frame 84 through the paint outlet.

[0044] The electric bidirectional screw 83 drives the paint feeding frame 84 to move horizontally along the guide frame 82 to the bottom of the paint storage box 85. When the paint feeding frame 84 squeezes the sealing baffle 87, the sealing baffle 87 slides horizontally along the guide rod four 86 and compresses the spring two 88, thereby releasing the sealing baffle 87 from blocking the discharge port of the paint storage box 85, and the paint in the paint storage box 85 falls into the paint feeding frame 84. The paint feeding frame 84 applies the paint to the coating roller 81 during the horizontal movement. The electric bidirectional screw 83 drives the coating roller 81 to rotate through the pulley assembly 89, thereby evenly applying the paint to the circuit board. The electric bidirectional screw 83 drives the paint feeding frame 84 to reciprocate, so that the paint in the paint storage box 85 is continuously fed to the coating roller 81, thereby achieving the effect of the coating roller 81 continuously coating the circuit board.

[0045] like Figure 1 and Fig.11As shown, a scraper assembly 10 for scraping off the paint on the protrusion 31 is provided at the bottom of the bracket 2. The scraper assembly 10 includes an inverted T-shaped rod 101, a scraper plate 102 and a spring three 103. Inverted T-shaped rods 101 are provided on both sides of the bottom of the bracket 2 with the conveyor belt 3 as the center. The inverted T-shaped rods 101 are slidably connected with the scraper plates 102. The scraper plates 102 are set as inclined surfaces, and the inclined surfaces are opposite to the movement trajectory of the conveyor belt 3. The scraper plates 102 are squeezed and matched with the protrusion 31. A spring three 103 is provided between the scraper plates 102 and the bracket 2.

[0046] When the bump 31 moves to the scraper plate 102 , the bump 31 is pressed and matched with the inclined surface of the scraper plate 102 , and the scraper plate 102 scrapes off the paint adhered to the bump 31 , thereby achieving efficient cleaning of the bump 31 .

[0047] A circuit board coating process, which is applicable to the circuit board coating machine described above, comprises the following steps:

[0048] S1: Load the circuit boards into the loading box 4 and stack them from bottom to top. When the conveyor belt 3 moves to the left, the protrusion 31 pushes the circuit board at the bottom of the loading box 4 to move along the conveyor belt 3. Similarly, the circuit boards are loaded from the loading box 4 to the conveyor belt 3 one by one.

[0049] S2: Spray the cleaning solvent in the liquid storage tank 5 onto the circuit board through the cleaning nozzle 51;

[0050] S3: Wipe and clean the surface of the circuit board using the cleaning roller 64.

[0051] S4: Through the telescopic function of the piston rod of the cylinder 61, the gear 71 is driven to mesh with the rack 72, so that the cleaning roller 64, the scraping frame 70 and the quadrilateral connecting frame 74 are rotated 180 degrees around the rotating rod 63.

[0052] S5: The scraping frame 70 is driven by the electric screw 75 to move horizontally, so as to scrape and clean the surface of the cleaning roller 64.

[0053] S6: The paint loading frame 84 is driven to move horizontally by the electric bidirectional screw 83, and the paint loading frame 84 is squeezed and matched with the sealing baffle 87, so that the paint in the paint storage box 85 is loaded into the paint loading frame 84, and the paint is loaded onto the coating roller 81 through the horizontal movement of the paint loading frame 84, and the coating operation is performed on the surface of the circuit board by the coating roller 81.

[0054] S7: The surface of the circuit board after the coating operation is dried by the dryer 9.

[0055] S8: The paint on the bump 31 is scraped off by squeezing the scraper plate 102 and the bump 31 .

[0056] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A circuit board coating machine, comprising a support leg (1), a bracket (2), a conveyor belt (3), a liquid storage tank (5) and a cleaning nozzle (51), wherein the support leg (1) is mounted with the bracket (2) on top, the conveyor belt (3) is rotatably arranged on the bracket (2), a liquid storage tank (5) is arranged at a protruding position on the top of the bracket (2), and the bottom of the liquid storage tank (5) is connected with a cleaning nozzle (51) for spraying and cleaning the surface of the circuit board, wherein the cleaning nozzle (51) is connected with the liquid storage tank (5) and is characterized in that: The invention also comprises a protrusion (31), a longitudinal protrusion rod (32), a cleaning component (6), a scraping component (7) and a coating component (8). The conveyor belt (3) is evenly spaced with protrusions (31). Both ends of the top of the protrusions (31) are provided with longitudinal protrusion rods (32). The bracket (2) is provided with a coating component (8) for coating the circuit board. The top of the bracket (2) is provided with a cleaning component (6) for wiping and cleaning the surface of the circuit board. The cleaning component (6) comprises a cylinder (61), a 7-shaped bracket (62), a rotating rod (63), a cleaning roller (64) and a transverse protrusion rod (65). A collecting frame (23) is provided on the outer wall of one side of the bracket (2). The other side of the bracket (2) and the collecting frame (23) are provided. 3) are provided with a cylinder (61), the end of the movable end of the piston rod of the cylinder (61) is connected to a 7-shaped frame (62), the end of the 7-shaped frame (62) away from the piston rod of the cylinder (61) is connected to a rotating rod (63), and the rotating rods (63) are commonly connected to a cylindrical cleaning roller (64), and protrusions that are frictionally matched with the surface of the circuit board are evenly arranged on the outer circumferential wall of the cleaning roller (64), and transverse convex rods (65) are evenly arranged at both ends of the cleaning roller (64) along the circumference thereof, and the longitudinal convex rod (32) squeezes the transverse convex rod (65) to drive the cleaning roller (64) to rotate, and a scraping component (7) for scraping contaminants on the surface of the cleaning roller (64) is slidably arranged on the cleaning roller (64); The scraping assembly (7) comprises a scraping frame (70), a gear (71), a rack (72), a T-shaped frame (73), a quadrilateral connecting frame (74), an electric screw (75) and two guide rods (76), one rotating rod (63) is connected to the gear (71), an eccentric portion of the gear (71) is connected to the T-shaped frame (73), the rack (72) arranged on the top of the bracket (2) is meshed with the gear (71), and the other rotating rod (63) is connected to the quadrilateral connecting frame having a notch at one corner. (74), a corner of the quadrilateral connecting frame (74) opposite to the notch corner is rotatably connected to the rotating rod (63), and the other two opposite corners of the quadrilateral connecting frame (74) are respectively connected to an electric screw rod (75) and a second guide rod (76), and one end of the electric screw rod (75) and the second guide rod (76) away from the quadrilateral connecting frame (74) is connected to the T-shaped frame (73), and a scraping frame (70) sleeved on the outside of the cleaning roller (64) is movably connected to the electric screw rod (75) and the second guide rod (76); It also includes a discharge baffle (77), a third guide rod (771), a first spring (772) and a push rod (741); the bottom of the scraper frame (70) accommodating chamber is arranged as an inclined surface and has a discharge port; at least two third guide rods (771) are arranged on the outer wall of the bottom of the scraper frame (70) accommodating chamber; a discharge baffle (77) for sealing the liquid discharge port is slidably arranged between the third guide rods (771); a first spring (772) is arranged between the discharge baffle (77) and the end of the third guide rod (771); and a push rod (741) that is pressed and matched with the discharge baffle (77) is commonly connected to the two ends of the notch of the quadrilateral connecting frame (74).

2. A circuit board coating machine according to claim 1, characterized in that: The number of teeth of the rack (72) is half the number of teeth of the gear (71).

3. A circuit board coating machine according to claim 2, characterized in that: The bracket (2) further comprises a loading box (4), a threaded rod (21), a guide rod (22) and an adjusting nut (41); the loading box (4) is movably arranged on the top of the bracket (2) via the threaded rod (21) and the guide rod (22); the bottom of the loading box (4) is arranged to be an opening for convenient loading of circuit boards; the loading box (4) is located above the conveyor belt (3); and the threaded rod (21) is threadedly connected with an adjusting nut (41) for fixing the loading box (4).

4. A circuit board coating machine according to claim 3, characterized in that: The coating assembly (8) comprises a mounting seat (80), a coating roller (81), a guide frame (82), an electric bidirectional screw (83), a coating material feeding frame (84), a coating material storage box (85), a fourth guide rod (86), a sealing baffle (87), a second spring (88) and a pulley assembly (89). The mounting seats (80) are symmetrically arranged on both sides of the bracket (2) with the conveyor belt (3) as the center. The coating roller (81) is rotatably arranged between the mounting seats (80). The guide frame (82) and the electric bidirectional screw (83) are arranged in parallel on the upper part of the mounting seat (80). The pulley assembly (89) is arranged between the electric bidirectional screw (83) and the coating roller (81). The guide frame (82) and the electric bidirectional screw (83) are arranged in parallel on the upper part of the mounting seat (80). A paint loading frame (84) is movably arranged between the screw rod (83), a paint storage box (85) is installed on one side of the bracket (2), a paint outlet is opened at the bottom of the paint storage box (85), the paint loading frame (84) is arranged below the paint outlet of the paint storage box (85), a sealing baffle (87) for sealing the paint outlet of the paint storage box (85) is slidably arranged on a guide rod four (86) installed at the bottom of the paint storage box (85), and a spring two (88) is arranged between the end of the guide rod four (86) and the sealing baffle (87), when the paint loading frame (84) squeezes the sealing baffle (87), the paint in the paint storage box (85) falls into the paint loading frame (84) through the paint outlet.

5. A circuit board coating machine according to claim 4, characterized in that: A dryer (9) for drying the paint on the circuit board is installed on the bracket (2).

6. A circuit board coating machine according to claim 5, characterized in that: A scraper assembly (10) for scraping off paint on the protrusion (31) is arranged at the bottom of the bracket (2). The scraper assembly (10) comprises an inverted T-shaped rod (101), a scraper plate (102) and a third spring (103). The bottom of the bracket (2) is provided with an inverted T-shaped rod (101) on both sides centered on the conveyor belt (3). The inverted T-shaped rod (101) is slidably connected to the scraper plate (102). A third spring (103) is arranged between the scraper plate (102) and the bracket (2).

7. A circuit board coating process, the process using the circuit board coating machine according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Loading the circuit boards into the loading box (4) and stacking them from bottom to top, and when the conveyor belt (3) moves to the left, the protrusion (31) pushes the circuit board at the bottom of the loading box (4) to move along the conveyor belt (3), and so on, so that the circuit boards are loaded from the loading box (4) onto the conveyor belt (3) piece by piece; S2: spraying the cleaning solvent in the liquid storage tank (5) onto the circuit board through the cleaning nozzle (51); S3: Wiping and cleaning the surface of the circuit board using a cleaning roller (64); S4: The piston rod of the cylinder (61) is extended and retracted to drive the gear (71) to mesh with the rack (72), thereby rotating the cleaning roller (64), the scraping frame (70) and the quadrilateral connecting frame (74) 180 degrees around the rotating rod (63); S5: driving the scraping frame (70) to move horizontally via the electric screw (75), thereby scraping and cleaning the surface of the cleaning roller (64); S6: driving the paint loading frame (84) to move horizontally by means of an electric bidirectional screw (83), and making the paint loading frame (84) and the sealing baffle (87) to be squeezed and matched, so that the paint in the paint storage box (85) is loaded into the paint loading frame (84), and the paint is loaded onto the coating roller (81) by means of the horizontal movement of the paint loading frame (84), and the coating operation is performed on the surface of the circuit board by means of the coating roller (81); S7: drying the surface of the circuit board after the coating operation by a dryer (9); S8: The paint on the protrusion (31) is scraped off by squeezing the scraper plate (102) and the protrusion (31).

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