Circulating type roller coating conveying device for painting two sides of circuit board

Abstract

The invention discloses a circulating type roll coating conveying device for painting two sides of a circuit board, and relates to the technical field of circuit board spraying, the circulating type roll coating conveying device comprises a roll coating mechanism and circulating conveying mechanisms, the circulating conveying mechanisms are arranged at the two ends of the roll coating mechanism, the roll coating mechanism comprises a paint pool, a lower coating roller and an upper coating roller, the lower coating roller is rotatably arranged in the paint pool, and the upper coating roller is rotatably arranged in the paint pool. The upper coating roller has the freedom degree of moving in the height direction of the paint pool, the circulating conveying mechanism comprises a top plate, an annular sliding rail and negative pressure sliding seats, the top plate has the freedom degree of moving in the horizontal direction, the annular sliding rail is fixed to the top of the top plate, and the multiple negative pressure sliding seats are arranged on the annular sliding rail in a sliding mode. The turnover switching mechanism is arranged between the two sets of circulating conveying mechanisms, the turnover switching mechanism turns over a circuit board on one circulating conveying mechanism and then conveys the circuit board to the other circulating conveying mechanism, the circuit board is coated with a layer of conformal coating in a roller coating mode, loss of the conformal coating is reduced, cost is reduced, double-face roller coating is achieved, and the production efficiency is improved. And the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board spraying, in particular to a circulating roller coating conveying device used for double-sided painting of circuit boards. Background Art

[0002] Before the circuit board is put into practical use, it needs to be coated with three-proof paint. After coating and curing, the three-proof paint will become a transparent protective film with excellent insulation, waterproof, anti-leakage, dustproof, anti-corrosion and other properties. At present, a spraying device is generally used to spray the circuit board, and the three-proof paint is sprayed on the circuit board through a spray gun, but the atomized three-proof paint is easy to dissipate in the air, causing a lot of waste and increasing production costs. Secondly, since both sides of the circuit board need to be sprayed, the double-sided spraying of the circuit board is difficult to realize automation at present, and the circuit board needs to be turned over manually, and its production efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a circulating roller coating conveying device for double-sided painting of circuit boards, so as to solve the deficiencies of the prior art.

[0004] The object of the present invention is achieved through the following technical solutions: a circulating roller coating conveying device for double-sided painting of a circuit board, comprising a roller coating mechanism and a circulating conveying mechanism, both ends of the roller coating mechanism are provided with the circulating conveying mechanism, the roller coating mechanism comprises a paint pool, a lower coating roller and an upper coating roller, the lower coating roller is rotatably arranged in the paint pool, half of the lower coating roller is immersed in the three-proof paint, the upper coating roller is rotatably arranged just above the lower coating roller, and the upper coating roller has the freedom to move along the height direction of the paint pool;

[0005] The circulating conveying mechanism includes a top plate, an annular slide rail and a negative pressure slide seat, the top plate has the freedom to move in the horizontal direction, the annular slide rail is fixed on the top of the top plate, a plurality of negative pressure slide seats are slidably arranged on the annular slide rail, and the top plate is used to drive the circuit board on the negative pressure slide seat to move to the bottom of the upper coating roller for rolling coating;

[0006] A flip switching mechanism is arranged between the two groups of the circulating conveying mechanisms, and the flip switching mechanism includes a lifting column, a switching beam and a finger cylinder. The lifting column has the freedom to move in the vertical direction, one end of the switching beam is rotatably connected to the lifting column, the rotation axis of the switching beam is horizontally arranged, and the other end of the switching beam is connected to a horizontal cylinder, and the telescopic shaft of the horizontal cylinder is connected to the cylinder body of the finger cylinder.

[0007] Furthermore, the roller coating mechanism also includes a lifting C-shaped frame and a fixed frame, a first cylinder is vertically mounted on the fixed frame, a telescopic shaft of the first cylinder is connected to the lifting C-shaped frame, a C-shaped opening of the lifting C-shaped frame is arranged downward, the upper coating roller is rotatably arranged in the lifting C-shaped frame, a motor is installed on the outer side wall of the lifting C-shaped frame, and the output shaft of the motor is transmission-connected to the upper coating roller.

[0008] Furthermore, the bottom of the top plate is rotatably connected to two driving shafts, and pulleys are mounted on the driving shafts. The two pulleys are connected through a synchronous belt transmission, and the trajectory of the synchronous belt coincides with the trajectory of the annular slide rail. The side wall of the negative pressure slide is connected to the synchronous belt through a connecting rod, and a motor seat is installed at the bottom of the top plate, and a stepper motor is arranged on the motor seat, and the output shaft of the stepper motor is transmission-connected to one of the driving shafts.

[0009] Furthermore, the cross-sectional shape of the annular slide rail is T-shaped, and two C-shaped slide seats are relatively connected to the bottom of the negative pressure slide seat. The C-shaped slide seat is slidably set on the annular slide rail, and multiple balls are rotatably set on the inner top wall and inner bottom wall of the C-shaped slide seat, and the balls roll and contact the annular slide rail.

[0010] Furthermore, a negative pressure chamber is arranged in the negative pressure slide, a plurality of negative pressure holes are provided on the top of the negative pressure slide, the negative pressure holes are connected to the negative pressure chamber, a horizontal slide groove is provided on the side wall of the negative pressure slide, the horizontal slide groove is located below the negative pressure chamber, one end of the horizontal slide groove is connected to the negative pressure chamber through a guide groove, a piston is provided for sliding in the horizontal slide groove, a horizontal hole is provided on one end of the piston close to the guide groove, a strip window is provided on the side wall of the piston, the strip window is connected to the horizontal hole, an air pressure balance hole is provided on the side wall of the negative pressure slide, the air pressure balance hole is connected to the horizontal slide groove, and when the air pressure balance hole and the strip window are in an interlaced position, the negative pressure chamber is in a negative pressure state.

[0011] Furthermore, a battery and an electromagnet are installed in the horizontal slide groove, and a permanent magnet is connected to the end of the piston away from the guide groove. When the electromagnet is energized, a magnetic pole with a magnetic property different from that of the permanent magnet is generated. A spring is arranged between the electromagnet and the permanent magnet. When the spring is in a normal state, the air pressure balance hole is connected to the strip window.

[0012] Furthermore, the circulating conveying mechanism also includes a conveying fixed frame and a second cylinder, a cylinder body of the second cylinder is installed on the conveying fixed frame, and a telescopic shaft of the second cylinder is connected to the top plate.

[0013] Furthermore, the circulating conveying mechanism also includes a drying mechanism, which includes a drying rack, on which a drying plate is fixed, the drying plate is located above the negative pressure slide, and an electric heating wire is arranged at the bottom of the drying plate.

[0014] Furthermore, the drying mechanism also includes a hot air rack, and the drying rack and the hot air rack are arranged at intervals along the conveying direction of the circuit board. A hot air plate is fixed to the side of the hot air rack close to the top plate, and the hot air plate is located above the negative pressure slide. A hot air cavity is formed in the hot air plate, and a plurality of hot air holes are opened at the bottom of the hot air plate, and the hot air holes are connected to the hot air cavity. A hot air blower is installed on the hot air rack, and the hot air blower is connected to the hot air cavity through an air duct.

[0015] Furthermore, the flip switching mechanism also includes a fixed base, a third cylinder is vertically installed on the top of the fixed base, the telescopic shaft of the third cylinder is connected to the lifting column, a switching spindle is fixed on the switching beam, the switching spindle is rotatably connected to the lifting column, a switching motor is installed on the lifting column, and the output shaft of the switching motor is transmission-connected to the switching spindle.

[0016] The beneficial effects of the present invention are:

[0017] 1. The upper coating roller moves downward to contact the upper coating roller. A layer of conformal coating is covered on the upper coating roller through the rotation of the upper coating roller and the lower coating roller. Then the upper coating roller moves upward to reset. The circuit board is loaded on the negative pressure slide. The circuit board is transported to the bottom of the upper coating roller through the movement of the top plate. The upper coating roller contacts the circuit board for rolling coating. With the movement of the top plate, the conformal coating is applied on one side of the circuit board. Compared with the spraying method, the loss of conformal coating is reduced and the cost is reduced.

[0018] 2. After the circuit board on one set of circulating conveying mechanisms is painted, it moves close to the flip switching mechanism. When the circuit board moves to the working position of the flip switching mechanism, the conveying stops, the circuit board is clamped by the finger cylinder, and then the switching beam drives the circuit board to flip 180°, and the circuit board is placed on the negative pressure slide of another set of circulating conveying mechanisms in conjunction with the freedom of the lifting column. The flipped circuit board is sent to the roller coating mechanism again through another circulating conveying mechanism for roller coating on the other side, so that the circuit board can be automatically rolled on both sides, improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The structure of a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a schematic diagram of the internal structure of a negative pressure slide in a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention;

[0022] Figure 4 The structure of a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention is shown in FIG. Figure 3 ;

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 The structure of a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention is shown in FIG. Figure 4 ;

[0025] Figure 7 The structure of a circulating roller coating conveying device for double-sided painting of a circuit board according to the present invention is shown in FIG. Figure 5 ;

[0026] In the figure, 1-paint pool, 2-lower coating roller, 3-upper coating roller, 4-top plate, 5-annular slide rail, 6-negative pressure slide seat, 7-lifting column, 8-switching beam, 9-finger cylinder, 10-horizontal cylinder, 11-lifting C-type frame, 12-fixed bracket, 13-first cylinder, 14-motor, 15-driving shaft, 16-pulley, 17-synchronous belt, 18-connecting rod, 19-motor seat, 20-stepping motor, 21-C-type slide seat, 22-ball, 23-negative pressure chamber, 24- Negative pressure hole, 25-horizontal slide, 26-guide groove, 27-piston, 28-horizontal hole, 29-strip window, 30-air pressure balance hole, 31-battery, 32-electromagnet, 33-permanent magnet, 34-spring, 35-conveying fixed frame, 36-second cylinder, 37-drying rack, 38-drying plate, 39-hot air rack, 40-hot air plate, 41-hot air hole, 42-hot air blower, 43-fixed base, 44-third cylinder, 45-switching spindle, 46-switching motor. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0028] Embodiment 1

[0029] like Figures 1 to 7As shown, a circulating roller coating conveying device for double-sided painting of circuit boards includes a roller coating mechanism and a circulating conveying mechanism. The circulating conveying mechanism is provided at both ends of the roller coating mechanism. The roller coating mechanism includes a paint pool 1, a lower coating roller 2 and an upper coating roller 3. The lower coating roller 2 is rotatably arranged in the paint pool 1, half of the lower coating roller 2 is immersed in the three-proof paint, and the upper coating roller 3 is rotatably arranged just above the lower coating roller 2. The upper coating roller 3 has the freedom to move along the height direction of the paint pool 1. A layer of three-proof paint is coated on the upper coating roller 3 by the lower coating roller 2, and the upper coating roller 3 is used to coat the circuit board with a layer of three-proof paint. A layer of conformal coating is rolled on the top, and the circuit board is coated by rolling. During the rolling process, the excess conformal coating automatically falls into the paint pool 1, which reduces the loss of the conformal coating and reduces the cost compared with the spraying method. The circulating conveying mechanism includes a top plate 4, an annular slide rail 5 and a negative pressure slide seat 6. The top plate 4 has the freedom to move in the horizontal direction. The top of the top plate 4 is fixed with an annular slide rail 5. A plurality of negative pressure slide seats 6 are slidably arranged on the annular slide rail 5. The top plate 4 is used to drive the circuit board on the negative pressure slide seat 6 to move to the bottom of the upper coating roller 3 for rolling coating.A flip switching mechanism is arranged between the two groups of circulating conveying mechanisms, and the flip switching mechanism comprises a lifting column 7, a switching beam 8 and a finger cylinder 9. The lifting column 7 has the freedom to move in the vertical direction, one end of the switching beam 8 is rotatably connected to the lifting column 7, and the rotation axis of the switching beam 8 is arranged horizontally. The other end of the switching beam 8 is connected to a horizontal cylinder 10, and the telescopic shaft of the horizontal cylinder 10 is connected to the cylinder body of the finger cylinder 9. A straight conveying line is arranged in the area of ​​the annular slide rail 5 near the roller coating mechanism, and one end of one circulating conveying mechanism and one end of the other circulating conveying mechanism are both provided with a mechanical arm, which can also be replaced by Other loading and unloading mechanisms, such as a gantry conveying mechanism, place the circuit board to be sprayed on a negative pressure slide 6 on a circulating conveying mechanism through a mechanical arm, and absorb the circuit board through the negative pressure generated by the negative pressure slide 6. The negative pressure slide 6 moves on the annular slide rail 5 to drive the circuit board to move forward. When the circuit board moves to the working position of the rolling coating mechanism, the negative pressure slide 6 stops moving, and the top plate 4 drives the circuit board to move close to the upper coating roller 3, so that the upper coating roller 3 contacts the top surface of the circuit board, and cooperates with the rotation of the upper coating roller 3 and the movement of the top plate 4 to complete the rolling coating of one side of the circuit board. When the rolling coating is completed, the top plate 4 drives the circuit board to reset, and then the negative pressure slide 6 drives the circuit board to move to the working position of the rolling coating mechanism. The circuit board is moved close to the flip switching mechanism. When the circuit board is located at the working position of the switching beam 8, the negative pressure slide 6 stops moving, and the horizontal cylinder 10 drives the finger cylinder 9 to move close to the circuit board so that the side of the circuit board is located between the two clamping claws of the finger cylinder 9. The circuit board is clamped by the finger cylinder 9, and then the switching beam 8 drives the circuit board to flip. When the circuit board is turned over, it is placed in the working position of another circulating conveying mechanism. The circuit board is driven downward by the lifting column 7 so that the circuit board falls on the negative pressure slide 6 of another circulating conveying mechanism, thereby turning the circuit board over and conveying it to the other circulating conveying mechanism. , the circuit board is conveyed to the working position of the roller coating mechanism through the circulating conveying mechanism, the top plate 4 of the circulating conveying mechanism drives the circuit board to move close to the upper coating roller 3, and the other side of the circuit board is roller coated in cooperation with the rotation of the upper coating roller 3. After the roller coating is completed, the top plate 4 drives the circuit board to reset, and then the roller-coated circuit board is conveyed to the unloading mechanical arm, and the unloading of the roller-coated circuit board is carried out by the mechanical arm. Since the annular slide rail 5 is a closed annular shape, the negative pressure slide seat 6 can move cyclically, so as to repeatedly convey the circuit board to the roller coating mechanism for roller coating operation, so that the circuit board realizes automatic double-sided roller coating, and improves production efficiency. ;

[0030] Furthermore, if Figure 1 and Figure 2As shown, the roller coating mechanism also includes a lifting C-shaped frame 11 and a fixed frame 12, a first cylinder 13 is vertically installed on the fixed frame 12, a telescopic shaft of the first cylinder 13 is connected to the lifting C-shaped frame 11, a C-shaped opening of the lifting C-shaped frame 11 is set downward, the coating roller 3 is rotatably set in the lifting C-shaped frame 11, an outer side wall of the lifting C-shaped frame 11 is installed with a motor 14, an output shaft of the motor 14 is connected to the coating roller 3, the motor 14 drives the coating roller 3 to rotate, so that different areas of the coating roller 3 contact the circuit board to complete the coating operation, the motor 14 adopts a reduction motor, which can provide a lower rotation speed, the first cylinder 13 drives the lifting C-shaped frame 11 to move up and down, and the lifting C-shaped frame 11 drives the coating roller 3 to move up and down to realize the coating operation.

[0031] Furthermore, if Figures 1 to 7 As shown, the flip switching mechanism also includes a fixed base 43, a third cylinder 44 is vertically installed on the top of the fixed base 43, the telescopic shaft of the third cylinder 44 is connected to the lifting column 7, a switching spindle 45 is fixed on the switching beam 8, the switching spindle 45 is rotatably connected to the lifting column 7, a switching motor 46 is installed on the lifting column 7, the output shaft of the switching motor 46 is transmission-connected to the switching spindle 45, the lifting column 7 is driven up and down by the telescopic movement of the third cylinder 44, so that the finger cylinder 9 clamps the circuit board and moves it upward to separate from the negative pressure slide 6 or clamps the circuit board and moves it downward to be placed on the negative pressure slide 6, the switching spindle 45 is driven to rotate by the switching motor 46, and the switching spindle 45 drives the switching beam 8 to rotate, thereby completing the flipping operation of the circuit board and realizing double-sided rolling coating of the circuit board.

[0032] Furthermore, the circulating conveying mechanism also includes a conveying fixed frame 35 and a second cylinder 36, the cylinder body of the second cylinder 36 is installed on the conveying fixed frame 35, the telescopic shaft of the second cylinder 36 is connected to the top plate 4, and the top plate 4 is driven to move close to the coating roller 3 through the telescopic movement of the second cylinder 36, so that the coating roller 3 contacts the top surface of the circuit board. When the coating roller 3 contacts the circuit board, the coating roller 3 rotates, thereby coating the three-proof paint on the coating roller 3 on the circuit board; in specific implementation, the size of the circuit board is larger than the size of the negative pressure slide 6. After the circuit board is placed on the negative pressure slide 6, the circuit board can completely cover the negative pressure slide 6, ensuring that during the rolling process, the three-proof paint will not fall on the negative pressure slide 6 to cause waste. Secondly, the coating roller 3 rotates only after contacting the circuit board, and the rotation speed is very low to avoid the generation of centrifugal force to cause splashing of the three-proof paint.

[0033] Embodiment 2

[0034] Based on the first embodiment, Figure 1 and Figure 2As shown, the circulating conveying mechanism also includes a drying mechanism, which includes a drying rack 37, on which a drying plate 38 is fixed, the drying plate 38 is located above the negative pressure slide 6, and an electric heating wire is arranged at the bottom of the drying plate 38. The drying rack 37 and the hot air rack 39 are arranged at intervals along the conveying direction of the circuit board, and a hot air plate 40 is fixed on one side of the hot air rack 39 close to the top plate 4, the hot air plate 40 is located above the negative pressure slide 6, a hot air cavity is formed in the hot air plate 40, and a plurality of hot air holes 41 are opened at the bottom of the hot air plate 40, and the hot air holes 41 are connected to the hot air cavity, and a hot air blower 42 is installed on the hot air rack 39, and the hot air blower 42 is connected to the hot air cavity through an air duct, and the circuit board after roller coating is brought into the bottom of the drying plate 38 through the negative pressure slide 6, and the three-proof paint is baked by the electric heating wire to make the three-proof paint solidify quickly. In order to avoid baking The time is too long, which affects the quality of the three-proof paint. The negative pressure slide 6 drives the circuit board to pass through the drying plate 38 without stopping. The circuit board that has been preliminarily dried enters the bottom of the hot air plate 40, and the air is added into the hot air chamber through the hot air blower 42. The hot air is sprayed to the circuit board through the hot air hole 41, so that the three-proof paint is completely solidified, and then it is transported to the flip switching mechanism for flipping operation, so that the side coated with the three-proof paint contacts the negative pressure slide 6 without affecting the spraying quality of the circuit board. In order to avoid the hot air blowing the three-proof paint to affect the rolling quality, the electric heating wire is first used for preliminary drying to ensure that the three-proof paint will not move during the subsequent hot air drying process, so that the drying operation does not affect the rolling quality of the three-proof paint. After the flipped circuit board is rolled, it is transported to the circulating conveying mechanism again for drying, and the unloading operation is performed after the drying is completed.

[0035] Embodiment 3

[0036] Based on the second embodiment, Figure 1 , Figure 2 and Figure 6 As shown, the bottom of the top plate 4 is rotatably connected with two driving shafts 15, and the driving shaft 15 is provided with a pulley 16, and the two pulleys 16 are connected through a synchronous belt 17. The trajectory of the synchronous belt 17 coincides with the trajectory of the annular slide rail 5, and the side wall of the negative pressure slide 6 is connected to the synchronous belt 17 through a connecting rod 18. A motor seat 19 is installed at the bottom of the top plate 4, and a stepper motor 20 is arranged on the motor seat 19. The output shaft of the stepper motor 20 is connected with one of the driving shafts 15, and one of the pulleys 16 is driven to rotate by the stepper motor 20, and the pulley 16 drives the other pulley 16 to rotate through the synchronous belt 17, and the synchronous belt 17 drives the negative pressure slide 6 to move on the annular slide rail 5 through the connecting rod 18. Since the trajectory of the synchronous belt 17 coincides with the trajectory of the annular slide rail 5, the synchronous belt 17 can smoothly drive the negative pressure slide 6 to move without interference, so that the negative pressure slide 6 moves in a circular shape, and the circuit board can be repeatedly rolled.

[0037] Embodiment 4

[0038] Based on the third embodiment, Figures 1 to 5 As shown, the cross-sectional shape of the annular slide rail 5 is T-shaped, and two C-type slide seats 21 are relatively connected to the bottom of the negative pressure slide seat 6. The C-type slide seat 21 is slidably set on the annular slide rail 5, and a plurality of balls 22 are rotatably set on the inner top wall and the inner bottom wall of the C-type slide seat 21. The balls 22 roll and contact the annular slide rail 5, and the negative pressure slide seat 6 is driven to move by the contact of the balls 22 with the annular slide rail 5, so that the friction between the negative pressure slide seat 6 and the annular slide rail 5 is greatly reduced, and the movement of the negative pressure slide seat 6 is smoother.

[0039] Embodiment 5

[0040] If a vacuum pump is directly used to make the negative pressure slide 6 generate negative pressure to adsorb the circuit board, the vacuum tube will be entangled when the negative pressure slide 6 moves in a circular manner. Therefore, it is necessary to solve the problem of vacuum tube unwinding. Based on the fourth embodiment, as shown in FIG. Figures 1 to 3As shown, a negative pressure cavity 23 is arranged in the negative pressure slide 6, a plurality of negative pressure holes 24 are provided on the top of the negative pressure slide 6, the negative pressure holes 24 are connected to the negative pressure cavity 23, a horizontal slide groove 25 is provided on the side wall of the negative pressure slide 6, the horizontal slide groove 25 is located below the negative pressure cavity 23, one end of the horizontal slide groove 25 is connected to the negative pressure cavity 23 through a guide groove 26, a piston 27 is provided for sliding in the horizontal slide groove 25, a horizontal hole 28 is provided on the end of the piston 27 close to the guide groove 26, a strip window 29 is provided on the side wall of the piston 27, the strip window 29 is connected to the horizontal hole 28, an air pressure balance hole 30 is provided on the side wall of the negative pressure slide 6, the air pressure balance hole 30 is connected to the horizontal slide groove 25, when the air pressure is balanced When the hole 30 and the strip window 29 are in a staggered position, the negative pressure chamber 23 is in a negative pressure state, a battery 31 and an electromagnet 32 ​​are installed in the horizontal slide 25, and the end of the piston 27 away from the guide groove 26 is connected to a permanent magnet 33, and the electromagnet 32 ​​is energized to generate a magnetic pole with a different magnetic property from the permanent magnet 33, and a spring 34 is arranged between the electromagnet 32 ​​and the permanent magnet 33. When the spring 34 is in a normal state, the air pressure balance hole 30 is connected to the strip window 29, and after the circuit board is placed on the negative pressure slide 6, the electromagnet 32 ​​is energized, and the electromagnet 32 ​​attracts the permanent magnet 33 to drive the piston 27 to move away from the guide groove 26, and the piston 27 moves the compressed spring 34, so that the air in the negative pressure chamber 23 is The pressure is less than the external air pressure, thereby generating a negative pressure in the negative pressure chamber 23. Under the action of the negative pressure hole 24, the circuit board is adsorbed on the negative pressure slide 6. When the piston 27 moves into place, the air pressure balance hole 30 and the strip window 29 are in a staggered state. At this time, the piston 27 blocks the air pressure balance hole 30, so that the negative pressure environment in the negative pressure chamber 23 can be maintained, thereby stably adsorbing the circuit board on the negative pressure slide 6. When the circuit board needs to be turned over or unloaded, the electromagnet 32 ​​is powered off, and under the reaction force of the spring 34, the piston 27 moves close to the guide groove 26, so that the air pressure balance hole 30 is connected to the strip window 29, and under the action of the horizontal hole 28, the negative pressure chamber 23 is connected to the outside world. atmosphere, thereby breaking the negative pressure environment in the negative pressure chamber 23, so that the circuit board can be smoothly removed from the negative pressure slide seat 6; in specific implementation, the reaction force of the spring 34 after compression is greater than the negative pressure force in the negative pressure chamber 23, so that after the electromagnet 32 ​​is powered off, the piston 27 can move close to the guide groove 26 under the action of the spring 34, so that the strip window 29 can be smoothly connected to the air pressure balance hole 30, and the power required for the electromagnet 32 ​​to work is provided by the battery 31, and the battery 31 is directly installed on the negative pressure ring seat 6 and moves with it, so that there will be no problem of winding the tube, and the circuit board can be smoothly adsorbed by negative pressure, and the battery only needs to be replaced or charged during shutdown or maintenance.

Claims

1. A circulating roller coating conveying device for double-sided painting of circuit boards, characterized in that: The invention comprises a roller coating mechanism and a circulating conveying mechanism, wherein the circulating conveying mechanism is arranged at both ends of the roller coating mechanism, the roller coating mechanism comprises a paint pool (1), a lower coating roller (2) and an upper coating roller (3), the lower coating roller (2) is rotatably arranged in the paint pool (1), half of the lower coating roller (2) is immersed in the three-proof paint, the upper coating roller (3) is rotatably arranged directly above the lower coating roller (2), and the upper coating roller (3) has the freedom to move along the height direction of the paint pool (1); The circulating conveying mechanism comprises a top plate (4), an annular slide rail (5) and a negative pressure slide seat (6); the top plate (4) has the freedom to move in the horizontal direction; the annular slide rail (5) is fixed on the top of the top plate (4); a plurality of negative pressure slide seats (6) are slidably arranged on the annular slide rail (5); the top plate (4) is used to drive the circuit board on the negative pressure slide seat (6) to move to the bottom of the coating roller (3) for rolling coating; A flip switching mechanism is arranged between the two groups of the circulating conveying mechanisms, and the flip switching mechanism comprises a lifting column (7), a switching beam (8) and a finger cylinder (9). The lifting column (7) has the freedom to move in the vertical direction. One end of the switching beam (8) is rotatably connected to the lifting column (7), and the rotation axis of the switching beam (8) is arranged horizontally. The other end of the switching beam (8) is connected to a horizontal cylinder (10), and the telescopic shaft of the horizontal cylinder (10) is connected to the cylinder body of the finger cylinder (9).

2. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1, characterized in that: The roller coating mechanism further comprises a lifting C-shaped frame (11) and a fixed frame (12); a first cylinder (13) is vertically mounted on the fixed frame (12); a telescopic shaft of the first cylinder (13) is connected to the lifting C-shaped frame (11); a C-shaped opening of the lifting C-shaped frame (11) is arranged downward; the coating roller (3) is rotatably arranged in the lifting C-shaped frame (11); a motor (14) is mounted on the outer side wall of the lifting C-shaped frame (11); and an output shaft of the motor (14) is drivingly connected to the coating roller (3).

3. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1, characterized in that: The bottom of the top plate (4) is rotatably connected to two driving shafts (15), and a pulley (16) is mounted on the driving shaft (15). The two pulleys (16) are connected in transmission via a synchronous belt (17). The track of the synchronous belt (17) coincides with the track of the annular slide rail (5). The side wall of the negative pressure slide seat (6) is connected to the synchronous belt (17) via a connecting rod (18). A motor seat (19) is installed at the bottom of the top plate (4), and a stepping motor (20) is arranged on the motor seat (19). The output shaft of the stepping motor (20) is connected in transmission with one of the driving shafts (15).

4. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 3, characterized in that: The cross-sectional shape of the annular slide rail (5) is T-shaped. The bottom of the negative pressure slide seat (6) is relatively connected to two C-shaped slide seats (21). The C-shaped slide seats (21) are slidably arranged on the annular slide rail (5). A plurality of balls (22) are rotatably arranged on the inner top wall and the inner bottom wall of the C-shaped slide seat (21). The balls (22) roll and contact the annular slide rail (5).

5. The circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1 is characterized in that: A negative pressure chamber (23) is arranged in the negative pressure slide seat (6), a plurality of negative pressure holes (24) are provided on the top of the negative pressure slide seat (6), the negative pressure holes (24) are connected to the negative pressure chamber (23), a horizontal slide groove (25) is provided on the side wall of the negative pressure slide seat (6), the horizontal slide groove (25) is located below the negative pressure chamber (23), one end of the horizontal slide groove (25) is connected to the negative pressure chamber (23) via a guide groove (26), a piston (27) is slidably adapted in the horizontal slide groove (25), A horizontal hole (28) is provided at one end of the piston (27) close to the guide groove (26), a strip window (29) is provided on the side wall of the piston (27), the strip window (29) is connected to the horizontal hole (28), and a gas pressure balance hole (30) is provided on the side wall of the negative pressure slide seat (6), the gas pressure balance hole (30) is connected to the horizontal slide groove (25), when the gas pressure balance hole (30) and the strip window (29) are in an interlaced position, the negative pressure chamber (23) is in a negative pressure state.

6. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 5, characterized in that: A storage battery (31) and an electromagnet (32) are installed in the horizontal slide groove (25); one end of the piston (27) away from the guide groove (26) is connected to a permanent magnet (33); the electromagnet (32) generates a magnetic pole with a different magnetic property from that of the permanent magnet (33) when energized; a spring (34) is arranged between the electromagnet (32) and the permanent magnet (33); when the spring (34) is in a normal state, the air pressure balance hole (30) is connected to the strip window (29).

7. The circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1 is characterized in that: The cyclic conveying mechanism also includes a conveying fixed frame (35) and a second cylinder (36), wherein a cylinder body of the second cylinder (36) is mounted on the conveying fixed frame (35), and a telescopic shaft of the second cylinder (36) is connected to the top plate (4).

8. The circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1 is characterized in that: The circulating conveying mechanism also includes a drying mechanism, which includes a drying rack (37). A drying plate (38) is fixed on the drying rack (37). The drying plate (38) is located above the negative pressure slide seat (6). An electric heating wire is arranged at the bottom of the drying plate (38).

9. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 8, characterized in that: The drying mechanism also includes a hot air rack (39), the drying rack (37) and the hot air rack (39) are arranged at intervals along the conveying direction of the circuit board, a hot air plate (40) is fixed to a side of the hot air rack (39) close to the top plate (4), the hot air plate (40) is located above the negative pressure slide seat (6), a hot air cavity is formed in the hot air plate (40), a plurality of hot air holes (41) are opened at the bottom of the hot air plate (40), the hot air holes (41) are connected to the hot air cavity, a hot air blower (42) is installed on the hot air rack (39), and the hot air blower (42) is connected to the hot air cavity through an air duct.

10. A circulating roller coating conveying device for double-sided painting of circuit boards according to claim 1, characterized in that: The flip switching mechanism also includes a fixed base (43), a third cylinder (44) is vertically mounted on the top of the fixed base (43), a telescopic shaft of the third cylinder (44) is connected to the lifting column (7), a switching main shaft (45) is fixed on the switching crossbeam (8), the switching main shaft (45) is rotatably connected to the lifting column (7), a switching motor (46) is mounted on the lifting column (7), and an output shaft of the switching motor (46) is transmission-connected to the switching main shaft (45).

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