Double-sided spraying method for PCB (Printed Circuit Board)

Abstract

The invention relates to a double-sided spraying method for a PCB (Printed Circuit Board), which comprises the following steps: step 1, the PCB enters a first jet printing system, the first jet printing system sprays the PCB, the PCB is provided with a first jet printing surface and a second jet printing surface, the PCB enters the first jet printing system, and the second jet printing surface is provided with a second jet printing surface; the method comprises the following steps: step 1, feeding a PCB into a first jet printing system, and carrying out jet printing action on a first jet printing surface of the PCB by the first jet printing system, step 2, feeding the PCB into a board turning system, and carrying out board turning action on the PCB by the board turning system, step 3, feeding the PCB into a second jet printing system, and carrying out jet printing action on a second jet printing surface of the PCB by the second jet printing system, therefore, the whole jet printing work is completed.

Description

Technical Field

[0001] The invention relates to a spraying method, in particular to a method for performing double-sided spraying on a PCB board. Background Art

[0002] As we all know, a text jet printer is a device used to print text or patterns on the surface of various materials. Its working principle is to spray ink in the form of tiny ink droplets directly onto the substrate through the nozzle to form the required text or pattern. Text jet printers are widely used in many fields, including the identification and marking of electronic products such as PCB boards and FPC boards.

[0003] The working principle of the inkjet printer is that the nozzles in the nozzles eject ink in the form of tiny ink droplets, and by controlling the opening and closing of the nozzles, the desired text or pattern can be formed on the substrate. This technology makes the inkjet printer have the characteristics of high precision and high resolution, and can print very delicate patterns and text.

[0004] The text printer can be particularly used in the field of spraying PCB boards and FPC boards. The text and patterns printed on the PCB board can be used to identify and mark different parts of the circuit board. Flexible circuit boards can also be marked and marked to meet the specific needs of users.

[0005] However, traditional text inkjet printers generally only have the function of spraying on one side of the substrate. If double-sided spraying is required, manual flipping is required, the work efficiency is low and the spraying quality cannot be guaranteed. Summary of the invention

[0006] The technical solution adopted by the present invention is: a double-sided spraying method for a PCB board, which comprises the following steps:

[0007] In the first step, the PCB board enters the first printing system, and the first printing system performs a spraying action on the PCB board. The PCB board has a first printing surface and a second printing surface, wherein the first printing surface and the second printing surface are respectively located at the top surface and the bottom surface of the PCB board. The PCB board enters the first printing system, and the first printing system performs a printing action on the first printing surface of the PCB board.

[0008] In the second step, the PCB board enters the flipping system, and the flipping system flips the PCB board.

[0009] The flip plate system includes a flip table, a flip motor, an upper receiving system and a lower receiving system, wherein the motor output shaft of the flip motor is connected to the flip table, the upper receiving system and the lower receiving system are arranged in the flip table, and the flip table has a feed inlet and a discharge port and a functional inner cavity, wherein the feed inlet and discharge port are communicated with the turntable inner cavity, the feed inlet and discharge port are located at one end of one side of the flip table, and the functional inner cavity is located between the upper receiving system and the lower receiving system, wherein the upper receiving system is located above the functional inner cavity, and the lower receiving system is located below the functional inner cavity.

[0010] The flip system has a feeding state, a flipping state and a discharging state. First, the flip system is in the feeding state, and the feeding and discharging ports correspond to the first printing system. The first printing system transfers the PCB board that has completed the printing action on the first printing surface to the functional inner cavity through the feeding and discharging ports. Then, the flip system is in the flipping state, and the upper receiving system and the lower receiving system fix the PCB board in the functional inner cavity. The flipping motor drives the flipping table to flip so that the feeding and discharging ports correspond to the second printing system. Finally, the flip system is in the discharging state, and the upper receiving system and the lower receiving system push the PCB board into the second printing system through the feeding and discharging ports.

[0011] In the third step, the PCB board enters the second printing system, and the second printing system performs printing on the second printing surface of the PCB board to complete the overall printing work.

[0012] The beneficial effects of the present invention are as follows: when the present invention is working, the printing body first enters the first printing system, and the first printing system performs a printing action on the first printing surface of the printing body, and then the printing body enters the flipping system, and the flipping system performs a flipping action on the printing body, and finally, the printing body enters the second printing system, and the second printing system performs a printing action on the second printing surface of the printing body, so as to complete the overall printing work. The printing machine of the present invention has the characteristics of high automation, simple and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0014] Figure 2 Schematic diagram of the flap system of the present invention.

[0015] Figure 3 It is a working schematic diagram of the flap system of the present invention.

[0016] Figure 4 It is a three-dimensional schematic diagram of the first printing system and the second printing system of the present invention.

[0017] Figure 5 It is a working schematic diagram of the first printing system and the second printing system of the present invention.

[0018] Figure 6 It is a schematic diagram of the principles of the turning table, the upper receiving system and the lower receiving system of the present invention.

[0019] Figure 7 It is a working schematic diagram of the turning table of the present invention.

[0020] Figure 8 It is a schematic diagram of the cross-sectional structure of the upper receiving system and the lower receiving system of the present invention.

[0021] Fig. 9 It is a schematic diagram of the principle of the inner bend wrapping fixing structure of the present invention.

[0022] Fig.10 It is a schematic structural diagram of the inner bending aid of the present invention.

[0023] Fig.11 It is a schematic diagram of another implementation mode of the upper receiving system of the present invention. DETAILED DESCRIPTION

[0024] like Figures 1 to 11 As shown, a double-sided spraying method for a PCB board comprises the following steps:

[0025] In the first step, the PCB board A enters the first printing system 200, and the first printing system 200 performs a spraying operation on the PCB board A.

[0026] The PCB board A has a first printing surface A1 and a second printing surface A2, wherein the first printing surface A1 and the second printing surface A2 are located on the top surface and the bottom surface of the PCB board A respectively.

[0027] The PCB board A enters the first printing system 200, and the first printing system 200 performs printing on the first printing surface A1 of the PCB board A.

[0028] In the second step, the PCB board A enters the flipping system 100, and the flipping system 100 flips the PCB board A.

[0029] The flip system 100 includes a flip table 400, a flip motor, an upper supporting system 600 and a lower supporting system 700, wherein the motor output shaft 500 of the flip motor is connected to the flip table 400, and the upper supporting system 600 and the lower supporting system 700 are arranged in the flip table 400.

[0030] like Figure 6As shown, the turning table 400 has an inlet and outlet port 410 and a functional inner cavity 420, wherein the inlet and outlet port 410 is communicated with the turntable inner cavity 420, the inlet and outlet port 410 is located at one end of one side of the turning table 400, and the functional inner cavity 420 is located between the upper receiving system 600 and the lower receiving system 700, wherein the upper receiving system 600 is located above the functional inner cavity 420, and the lower receiving system 700 is located below the functional inner cavity 420.

[0031] like Figure 7 As shown, the flip system 100 has a feeding state, a flipping state and a discharging state. First, the flip system 100 is in the feeding state, and the feeding and discharging port 410 corresponds to the first printing system 200. The first printing system 200 transfers the PCB board A that has completed the printing action of the first printing surface A1 to the functional inner cavity 420 through the feeding and discharging port 410. Secondly, the flip system 100 is in the flipping state, the upper receiving system 600 and the lower receiving system 700 fix the PCB board A in the functional inner cavity 420, and the flipping motor drives the flipping table 400 to flip, so that the feeding and discharging port 410 corresponds to the second printing system 300. Finally, the flip system 100 is in the discharging state, and the upper receiving system 600 and the lower receiving system 700 push the PCB board A through the feeding and discharging port 410 to the second printing system 300.

[0032] In the third step, the PCB board A enters the second printing system 300, and the second printing system 300 performs printing on the second printing surface A2 of the PCB board A to complete the overall printing work.

[0033] like Figure 8 As shown, in the second step, the upper supporting system 600 includes several upper pulleys 611 and an upper belt 612, and the upper belt 612 is wound around the several upper pulleys 611. The upper belt 612 includes an inclined functional surface 610, a clamping rib 620 and a deformed inner cavity 630. The upper belt 612 has an inner side surface 640 and an outer end side surface 650. The inner side surface 640 is pressed on the several upper pulleys 611, wherein the inclined functional surface 610 is obliquely connected between the inner side surface 640 and the outer end side surface 650, and the clamping rib 620 is protruded on the inner side surface 640. Each of the upper pulleys 611 is provided with a rib groove 621, and the clamping rib 620 is clamped in the rib groove 621. The deformed inner cavity 630 is arranged in the upper belt 612.

[0034] The lower receiving system 700 includes a plurality of lower pulleys 711 and a lower belt 712, wherein the lower belt 712 is wound around the plurality of lower pulleys 711, and the lower belt 712 has a belt inner side surface 710 and a belt outer side surface 720, wherein the belt inner side surface 710 is pressed onto the plurality of lower pulleys 711. The functional inner cavity 420 of the turning platform 400 is formed by surrounding the inclined functional surface 610 of the upper belt 612 and the belt outer side surface 720 of the lower belt 712.

[0035] When the PCB board A is located in the functional inner cavity 420, that is, when the flap system 100 is in the feeding state, the flipping state and the discharging state, the second printing surface A2 of the PCB board A is pressed on both sides of the belt outer side surface 720 of the lower belt 712, and the top edges A3 on both sides of the first printing surface A1 of the PCB board A are pressed on the upper extrusion area 613 of the inclined functional surface 610 of the upper belt 612. In this state, the upper belt 612 forms an inwardly bent wrapped fixed structure.

[0036] like Fig. 9 As shown, the inner curved wrapping fixing structure includes a belt top fixing portion 810, a belt bottom fixing portion 820 and a belt inner curved portion 830, wherein the clamping rib 620 of the upper belt 612 is clamped in the rib groove 621 of the upper pulley 611 to form the belt top fixed portion 810, the top edge A3 on both sides of the PC B board A is top-mounted on the upper extrusion area 613 of the upper belt 612 to form the belt bottom fixed portion 820, the position between the inclined functional surface 610 of the upper belt 612 and the deformed inner cavity 630 forms the belt inner curved portion 830, and the belt inner curved portion 830 is located between the belt top fixed portion 810 and the belt bottom fixed portion 820.

[0037] When the PCB board A is located in the functional inner cavity 420, the top edges A3 on both sides of the PCB board A push against the upper belt 612, causing the upper belt 612 to be physically deformed. The inner bent portion 830 of the belt bends toward the deformed inner cavity 630, and the outer end side surface 650 of the upper belt 612 bends toward the PCB board A, forming the inner bent wrapping fixed structure.

[0038] The inner curved wrapping fixing structure can wrap around both sides of the PCB board A, and the inner curved wrapping fixing structure will not contact the first printing surface A1 of the PCB board A, so as to avoid the upper belt 612 scratching the coating on the first printing surface A1. At the same time, the contact area between the upper belt 612 and the PCB board A can be increased with the help of the inner curved wrapping fixing structure, so that when the PCB board A is located in the functional inner cavity 420, the flip system 100 can stably complete the feeding state, the flipping state and the discharging state.

[0039] like Fig.10 As shown, during the specific implementation, the upper receiving system 600 also includes an inner bending assistant 660, which includes a cylinder 661, a pull rod 662 and a pressure head 663, wherein the cylinder 661 is arranged on the top of the turning table 400, the pull rod 662 is connected to the power output shaft of the cylinder 661, and the pressure head 663 is arranged at the bottom of the pull rod 662, and the pressure head 663 corresponds to the outer end side surface 650 of the upper belt 612. When the upper belt 612 forms the inner bending wrapping fixed structure, the cylinder 661 causes the pressure head 663 to squeeze the outer end side surface 650 through the pull rod 662 to improve the bending efficiency of the inner bending wrapping fixed structure, as shown in FIG. Fig.11 As shown, during specific implementation, the upper supporting system 600 may also adopt other structures.

[0040] In the first step, the first printing system 200 includes a first printing station 210, a first embedded conveyor belt 220 and a first printing system 230, wherein the first embedded conveyor belt 220 is arranged in the first printing station 210, the first printing system 230 is arranged above the first printing station 210, the first printing station 210 is provided with a first conveyor belt slot 211 and a plurality of first suction cups 212, the first embedded conveyor belt 220 is arranged in the first conveyor belt slot 211, the top of the first embedded conveyor belt 220 has a first conveying surface 221, and the tops of the plurality of first suction cups 212 are simultaneously located on the first adsorption surface 213.

[0041] like Figure 5As shown, the first printing system 200 has a first transmission and feeding state and a first adsorption and spraying state. When the first printing system 200 is in the first transmission and feeding state, the first transmission surface 221 is higher than the first adsorption surface 213. At this time, the second printing surface A2 of the PCB board A contacts the first transmission surface 221. The first embedded transmission belt 220 drives the PCB board A to move back and forth on the first printing station 210. When the first printing system 200 is in the first adsorption and spraying state, the first transmission surface 221 is lower than the first adsorption surface 213. At this time, the second printing surface A2 of the PCB board A is adsorbed and fixed on the first adsorption surface 213. The first printing system 230 is in the first adsorption and spraying state of the PCB board A. The printing action is performed on the printing surface A1. In practice, the spatial position of the first transmission surface 221 is fixed, and the spatial position of the first adsorption surface 213 is adjusted by performing an up and down extension action of the first suction cups 212 in the first printing station 210, so that when the first printing system 200 is in the first transmission feeding state, the first transmission surface 221 is higher than the first adsorption surface 213, and when the first printing system 200 is in the adsorption and spraying state, the first transmission surface 221 is lower than the first adsorption surface 213. In a specific implementation, the first printing system 230 includes a movable track part and a nozzle, and the nozzle is arranged at the bottom of the movable track part. The technical content of the first printing system 230 belongs to the prior art and is not repeated here.

[0042] In the third step, the second printing system 300 includes a second printing station 310, a second embedded conveyor belt 320 and a second printing system 330, wherein the second embedded conveyor belt 320 is arranged in the second printing station 310, the second printing system 330 is arranged above the second printing station 310, the second printing station 310 is provided with a second conveyor belt slot 311 and a plurality of second suction cups 312, the second embedded conveyor belt 320 is arranged in the second conveyor belt slot 311, the second embedded conveyor belt 320 has a second conveying surface 321 on the top, and the tops of the plurality of second suction cups 312 are simultaneously located on the second adsorption surface 313.

[0043] like Figure 5As shown, the second printing system 300 has a second transmission and feeding state and a second adsorption and spraying state. When the second printing system 300 is in the second transmission and feeding state, the second transmission surface 321 is higher than the second adsorption surface 313. At this time, the first printing surface A1 of the PCB board A contacts the second transmission surface 321. The second embedded transmission belt 320 drives the PCB board A to move back and forth on the second printing station 310. When the second printing system 300 is in the second adsorption and spraying state, the second transmission surface 321 is lower than the second adsorption surface 313. At this time, the first printing surface A1 of the PCB board A is adsorbed and fixed on the second adsorption surface 313. The second printing system 330 is used to transfer the first printing surface A1 of the PCB board A to the second adsorption surface 313. The printing action is performed on the printing surface A2. In practice, the spatial position of the second transmission surface 321 is fixed. The second suction cups 312 are used to perform up and down telescopic actions in the second printing station 310 to adjust the spatial position of the second adsorption surface 313, so that when the second printing system 300 is in the second transmission feeding state, the second transmission surface 321 is higher than the second adsorption surface 313. When the second printing system 300 is in the second adsorption spraying state, the second transmission surface 321 is lower than the second adsorption surface 313. In the specific implementation, the second printing system 330 includes a moving track part and a nozzle, and the nozzle is arranged at the bottom of the moving track part. The technical content of the second printing system 330 belongs to the prior art and is not repeated here. The present invention can facilitate the transmission of the PCB board A and fix the position when performing the printing action through the structural design of the first printing system 200 and the second printing system 300, and the overall structure can improve work efficiency.

[0044] like Figure 7As shown, the flap system 100 has a feeding state, a flipping state and a discharging state. When the flap system 100 is in the feeding state, the feeding and discharging port 410 corresponds to the first embedded conveyor belt 220 of the first printing system 200. The first embedded conveyor belt 220 transfers the PCB board A that has completed the printing action of the first printing surface A1 to the functional inner cavity 420 through the feeding and discharging port 410. When the flap system 100 is in the flipping state, the upper receiving system 600 and the lower receiving system 700 fix the PCB board A in the functional inner cavity 420. In the process, the flip motor drives the flip table 400 to flip, so that the material inlet and outlet 410 corresponds to the second embedded conveyor belt 320 of the second printing system 300. When the flip system 100 is in the discharging state, the upper receiving system 600 and the lower receiving system 700 push the PCB board A through the material inlet and outlet 410 to the second embedded conveyor belt 320 of the second printing system 300. The second embedded conveyor belt 320 transmits the PCB board A to the second printing system 330, and printing is performed on the second printing surface A2 of the PCB board A.

Claims

1. A double-sided spraying method for a PCB board, characterized in that: The steps include: In the first step, the PCB board enters the first printing system, and the first printing system performs a spraying operation on the PCB board. The PCB board has a first printing surface and a second printing surface, wherein the first printing surface and the second printing surface are respectively located at the top surface and the bottom surface of the PCB board. The PCB board enters the first printing system, and the first printing system performs a printing operation on the first printing surface of the PCB board. In the second step, the PCB board enters the flipping system, and the flipping system flips the PCB board. The flip plate system includes a flip table, a flip motor, an upper receiving system and a lower receiving system, wherein the motor output shaft of the flip motor is connected to the flip table, the upper receiving system and the lower receiving system are arranged in the flip table, the flip table has a material inlet and outlet and a functional inner cavity, wherein the material inlet and outlet are connected to the inner cavity of the turntable, the material inlet and outlet are located at one end of the flip table, the functional inner cavity is located between the upper receiving system and the lower receiving system, wherein the upper receiving system is located above the functional inner cavity, and the lower receiving system is located below the functional inner cavity, The flip system has a feeding state, a flipping state and a discharging state. First, the flip system is in the feeding state, and the feeding and discharging port corresponds to the first printing system. The first printing system transmits the PCB board that has completed the printing action of the first printing surface to the functional inner cavity through the feeding and discharging port. Then, the flip system is in the flipping state, and the upper receiving system and the lower receiving system fix the PCB board in the functional inner cavity. The flip motor drives the flip table to flip, so that the feeding and discharging port corresponds to the second printing system. Finally, the flip system is in the discharging state, and the upper receiving system and the lower receiving system push the PCB board into the second printing system through the feeding and discharging port. In the third step, the PCB board enters the second printing system, and the second printing system performs printing on the second printing surface of the PCB board to complete the overall printing work.

2. A double-sided spraying method for a PCB board as claimed in claim 1, characterized in that: In the second step, the upper receiving system includes several upper pulleys and an upper belt, the upper belt is wound on several of the upper pulleys, the upper belt includes an inclined functional surface, a clamping rib and a deformed inner cavity, the upper belt has an inner side surface and an outer end side surface, the inner side surface is pressed on several of the upper pulleys, wherein the inclined functional surface is obliquely connected between the inner side surface and the outer end side surface, the clamping rib is convexly arranged on the inner side surface, each of the upper pulleys is provided with a rib groove, the clamping rib is clamped in the rib groove, and the deformed inner cavity is arranged in the upper belt, The lower receiving system includes a plurality of lower pulleys and a lower belt, wherein the lower belt is wound around the plurality of lower pulleys, and the lower belt has an inner side surface and an outer side surface, wherein the inner side surface of the belt is pressed on the plurality of lower pulleys, and the functional inner cavity of the turning table is formed by the inclined functional surface of the upper belt and the outer side surface of the lower belt. When the PCB is located in the functional inner cavity and the flap system is in the feeding state, the flipping state and the discharging state, the two sides of the second printing surface of the PCB are pressed on the outer side of the lower belt, and the top edges of the two sides of the first printing surface of the PCB are pressed on the upper extrusion area of ​​the inclined functional surface of the upper belt. In this state, the upper belt forms an inner curved wrapping fixed structure. The inner curved wrapping fixing structure comprises a belt top fixing portion, a belt bottom fixing portion and a belt inner curved portion, wherein the position where the clamping rib of the upper belt is clamped in the rib groove of the upper pulley forms the belt top fixing portion, the top edges on both sides of the PCB board are arranged on the upper extrusion area of ​​the upper belt to form the belt bottom fixing portion, the position between the inclined functional surface of the upper belt and the deformed inner cavity forms the belt inner curved portion, and the belt inner curved portion is located between the belt top fixing portion and the belt bottom fixing portion. When the PCB board is located in the functional inner cavity, the top edges on both sides of the PCB board press against the upper belt, causing the upper belt to be physically deformed. The inner bent portion of the belt bends toward the deformed inner cavity, and the outer end side of the upper belt bends toward the PCB board. The upper belt forms the inner bent wrapping fixing structure, which can wrap around both sides of the PCB board, and the inner bent wrapping fixing structure will not contact the first printing surface of the PCB board.

3. A double-sided spraying method for a PCB board as claimed in claim 2, characterized in that: The upper supporting system also includes an inner bending assistant, which includes a cylinder, a pull rod and a pressure head, wherein the cylinder is arranged on the top of the turning table, the pull rod is connected to the power output shaft of the cylinder, and the pressure head is arranged at the bottom of the pull rod, and the pressure head corresponds to the outer end side of the upper belt. When the upper belt forms the inner bending wrapping fixed structure, the cylinder causes the pressure head to squeeze the outer end side through the pull rod.

4. A double-sided spraying method for a PCB board as claimed in claim 2, characterized in that: In the first step, the first printing system includes a first printing station, a first embedded conveyor belt and a first printing system, wherein the first embedded conveyor belt is arranged in the first printing station, the first printing system is arranged above the first printing station, a first conveyor belt slot and a plurality of first suction cups are arranged in the first printing station, the first embedded conveyor belt is arranged in the first conveyor belt slot, the top of the first embedded conveyor belt has a first conveying surface, and the tops of the plurality of first suction cups are simultaneously located on the first adsorption surface, The first printing system has a first transmission and feeding state and a first adsorption and spraying state. When the first printing system is in the first transmission and feeding state, the first transmission surface is higher than the first adsorption surface. At this time, the second printing surface of the PCB board is in contact with the first transmission surface. The first embedded transmission belt drives the PCB board to move back and forth on the first printing table. When the first printing system is in the first adsorption and spraying state, the first transmission surface is lower than the first adsorption surface. At this time, the second printing surface of the PCB board is adsorbed and fixed on the first adsorption surface, and the first printing system performs printing on the first printing surface of the PCB board.

5. A double-sided spraying method for a PCB board as claimed in claim 4, characterized in that: In the third step, the second printing system includes a second printing station, a second embedded conveyor belt and a second printing system, wherein the second embedded conveyor belt is arranged in the second printing station, the second printing system is arranged above the second printing station, a second conveyor belt slot and a plurality of second suction cups are arranged in the second printing station, the second embedded conveyor belt is arranged in the second conveyor belt slot, the second embedded conveyor belt has a second conveying surface on the top, and the tops of the plurality of second suction cups are simultaneously located on the second adsorption surface, The second printing system has a second transmission and feeding state and a second adsorption and spraying state. When the second printing system is in the second transmission and feeding state, the second transmission surface is higher than the second adsorption surface. At this time, the first printing surface of the PCB board contacts the second transmission surface. The second embedded transmission belt drives the PCB board to move back and forth on the second printing table. When the second printing system is in the second adsorption and spraying state, the second transmission surface is lower than the second adsorption surface. At this time, the first printing surface of the PCB board is adsorbed and fixed on the second adsorption surface, and the second printing system performs printing on the second printing surface of the PCB board. When the flap system is in the feeding state, the feeding and discharging port corresponds to the first embedded conveyor belt of the first printing system, and the first embedded conveyor belt transfers the PCB board that has completed the printing action on the first printing surface to the functional inner cavity through the feeding and discharging port. When the flap system is in the flipping state, the upper receiving system and the lower receiving system fix the PCB board in the functional inner cavity, and the flipping motor drives the flipping table to flip so that the feeding and discharging port corresponds to the second embedded conveyor belt of the second printing system. When the flap system is in the discharging state, the upper receiving system and the lower receiving system push the PCB board through the feeding and discharging port to the second embedded conveyor belt of the second printing system, and the second embedded conveyor belt transfers the PCB board to the second printing system, and performs the printing action on the second printing surface of the PCB board.

6. A double-sided spraying method for a PCB board as claimed in claim 5, characterized in that: The spatial position of the first transmission surface is fixed, and the spatial position of the first adsorption surface is adjusted by the first suction cups being extended and retracted up and down in the first printing station, so that when the first printing system is in the first transmission feeding state, the first transmission surface is higher than the first adsorption surface, and when the first printing system is in the adsorption spraying state, the first transmission surface is lower than the first adsorption surface. The spatial position of the second transmission surface is fixed, and the spatial position of the second adsorption surface is adjusted by performing an up and down extension and retraction action on a plurality of the second suction cups in the second printing station, so that when the second printing system is in the second transmission and feeding state, the second transmission surface is higher than the second adsorption surface, and when the second printing system is in the second adsorption and spraying state, the second transmission surface is lower than the second adsorption surface.

7. A double-sided spraying method for a PCB board as claimed in claim 6, characterized in that: The first printing system includes a movable track portion and a nozzle, and the nozzle is arranged at the bottom of the movable track portion. The second printing system includes a movable track portion and a nozzle, and the nozzle is arranged at the bottom of the movable track portion.

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