A character printing process for PCB board

Abstract

The invention discloses a character printing process for a PCB board, which specifically comprises the following steps: S1, loading a prepared PCB board onto a conveying device, moving the PCB board toward a printer through a conveyor belt, and stopping the PCB board at the printer; S2, at this time, the PCB board is located on the inner side of a supporting positioning mechanism, the supporting positioning mechanism comprises relatively distributed positioning components and positioning cylinders, the PCB board is positioned by the positioning components and the positioning cylinders, and the inner surface of the conveyor belt at the PCB board is supported by the supporting components, and two positioning plates in the positioning components are driven to move relative to each other while being supported by the supporting components; the invention can stably support the PCB board during the printing process of the PCB board, and will not fall or sway, thereby preventing the side deviation of the character printing, and positioning both sides of the PCB board while supporting the PCB board, thereby ensuring the accuracy of the printing process position of the PCB board, and allowing both the front and back sides of the PCB board to be printed, thereby improving the surface character printing quality and printing process stability of the PCB board.

Description

Technical Field

[0001] The invention belongs to the technical field of PCB board printing technology, and in particular relates to a character printing technology for a PCB board. Background Art

[0002] Inkjet printing technology has been widely used in PCB circuit board identification and solder mask printing. In the digital age, the need to read board edge codes and generate and print QR codes instantly makes inkjet printing technology the only irreplaceable means.

[0003] Inkjet printing technology is based on the working principle of additive manufacturing. According to the Gerber data produced by CAM, the specific logo or solder mask ink is printed on the circuit board through CCD precise graphic positioning, and instantly cured by UVLED light source, thus completing the printing process of PCB logo or solder mask oil.

[0004] When a conveyor belt is used to transport the PCB board to the printing site, the PCB board may lack corresponding support measures at the printing site, so that the PCB board may slightly shake and deviate during the printing process, affecting the printing quality. At the same time, the PCB board moving with the conveyor belt may deviate and be difficult to locate in time. For this reason, we propose a character printing process for PCB boards. Summary of the invention

[0005] The purpose of the present invention is to provide a character printing process for a PCB board to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a character printing process for a PCB board, specifically comprising the following steps;

[0007] S1. Load the prepared PCB board onto the conveying device, and move it toward the inkjet printer through the conveyor belt. The PCB board moves to the inkjet printer and stops;

[0008] S2, at this time, the PCB board is located inside the support positioning mechanism, which includes relatively distributed positioning members and positioning cylinders. The positioning members and positioning cylinders are used to position the PCB board, and the inner surface of the conveyor belt at the PCB board is supported by the support members. While the support by the support members, the two positioning plates in the positioning members are driven to move relative to each other, contacting the two sides of the PCB board for positioning;

[0009] S3, the positioned PCB board is printed with characters by the printing gun in the printing machine. After the front side of the PCB board is processed, it is immediately cured by the UVLED light source;

[0010] S4, the cured PCB board is turned over by the turning member, and is positioned again by the positioning member and the positioning cylinder. At this time, the reverse side of the PCB board is again spray-printed with characters, and the processed PCB board is transported outward to the identification and rejection mechanism through the conveying device;

[0011] S5. The front side of the PCB board is identified by the horizontal identification instrument, and the PCB board is tilted by the tilting member to cooperate with the tilting identification instrument to identify the back side of the PCB board. The qualified PCB boards continue to be transported outward, and the unqualified PCB boards can be placed on the storage table.

[0012] Preferably, the conveyor belt is installed on the top of the conveying device, and the conveyor belt horizontally passes through the inkjet printer, the positioning member is installed on the top of the supporting member and can position both sides of the PCB board, and the inner surface of the inkjet printer is provided with a positioning cylinder distributed opposite to the positioning member;

[0013] The support member includes a mounting rod rotatably mounted on the surface of the conveying device and located inside the conveyor belt, and the upper and lower surfaces of the mounting rod are provided with support plates supporting the inner surface of the conveyor belt. The support member also includes a bidirectional screw rod driving the two mounting rods to rotate;

[0014] The positioning component comprises two positioning plates slidably mounted on a bidirectional lead screw.

[0015] Preferably, the supporting member also includes a fixed gear fixedly sleeved on the front end of the mounting rod, two movable seats are threadedly sleeved on the bidirectional screw rod, meshing teeth engaging with the fixed gear are distributed on the lower surface of the movable seat, and a driving motor is arranged at one end of the bidirectional screw rod.

[0016] Preferably, the positioning member further comprises a mounting plate arranged on the top of the movable seat, an electric telescopic rod is arranged on the upper surface of the mounting plate, a positioning plate is arranged at the rear end of the electric telescopic rod, and a cross rail is arranged on the front surface of the movable seat.

[0017] Preferably, the front end of the mounting plate is slidably sleeved on the cross rail, and a limiting bolt is screwed on the front end of the mounting plate.

[0018] Preferably, a flipping component for flipping the PCB board is provided at the front end of the mounting rod, and the flipping component includes a vertical plate mounted on the front end of the mounting rod, a lifting cylinder is provided on the inner side of the vertical plate, a support seat is provided at the upper end of the lifting cylinder, a moving cylinder is vertically provided inside the support seat, and a flipping motor is provided at the front end of the moving cylinder.

[0019] Preferably, a suction plate is vertically arranged at the rear end of the movable cylinder, and a stabilizing plate for supporting the lifting cylinder is arranged at the bottom of the vertical plate.

[0020] Preferably, the identification and rejection mechanism includes a storage table located behind the conveying device, a stand is provided on the rear surface of the storage table, a movable horizontal plate is slidably provided on the top of the stand, a driving cylinder is provided on the upper surface of the front end of the movable horizontal plate, an inclined member is connected to the lower end of the driving cylinder, and an inclination identifier is inclinedly provided on the outer side of the movable horizontal plate.

[0021] Preferably, a level identifier is provided below the driving cylinder, the tilting member further comprises a top cylinder provided on the front end side of the movable horizontal plate, the top cylinder is rotatably connected to the side of the level identifier, a piston rod body is provided inside the driving cylinder, a vacuum suction cup is provided on the lower surface of the level identifier, a fixed lug is provided on the upper surface of the level identifier, and a sliding column rotatably connected to the fixed lug is provided on the end of the piston rod body.

[0022] Preferably, a guide rail movably penetrating the stand is disposed on the lower surface of the movable horizontal plate, a fixed rack is disposed on the upper surface of the movable horizontal plate, a rotating gear is meshed on the fixed rack, and a rotating motor connected to the rotating gear is disposed on the side of the stand.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention can stably support the PCB board during the printing process, and will not cause the PCB board to fall or sway, thereby preventing the character printing from being lateral. The present invention can also position both sides of the PCB board while supporting the PCB board, thereby ensuring the accuracy of the printing position of the PCB board, and allowing both the front and back sides of the PCB board to be printed, thereby improving the character printing quality and printing stability on the surface of the PCB board.

[0025] (2) The present invention can quickly flip the PCB placed on the conveyor belt through the designed flipping component, which is convenient for printing characters on the back of the PCB. In combination with the positioning component, the PCB can always be positioned in the front and back positions, thereby increasing the accuracy of the printing processing position of the PCB.

[0026] (3) The present invention can quickly identify whether the characters on the front and back of the PCB board are qualified through the designed identification and rejection mechanism, and process and store qualified and unqualified PCB boards separately, thereby increasing the convenience of PCB board printing processing, and preventing product mixing, thereby reducing the trouble of subsequent manual identification and sorting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the PCB printing device of the present invention;

[0028] Figure 2 It is a left-side structural schematic diagram of the PCB printing device of the present invention;

[0029] Figure 3For the present invention Figure 1 Schematic diagram of the structure of the inkjet printer and the support positioning mechanism;

[0030] Figure 4 For the present invention Figure 3 Structural schematic diagram of the middle support positioning mechanism;

[0031] Figure 5 For the present invention Figure 4 A schematic diagram of the structure of the middle support member viewed from above;

[0032] Figure 6 For the present invention Figure 4 The structural diagram of the positioning component;

[0033] Figure 7 For the present invention Figure 4 The structural diagram of the flip component;

[0034] Figure 8 For the present invention Figure 1 The structural diagram of the identification and rejection mechanism;

[0035] Fig. 9 For the present invention Figure 8 A magnified image of area A;

[0036] In the figure: 100, conveying device; 101, inkjet printer; 102, inkjet gun; 103, conveyor belt; 200, supporting and positioning mechanism; 201, supporting member; 2011, mounting rod; 2012, supporting plate; 2013, fixed gear; 2014, moving seat; 2015, meshing teeth; 2016, two-way screw rod; 2017, driving motor; 202, positioning member; 2021, mounting plate; 2022, positioning plate; 2023, electric telescopic rod; 2024, cross rail; 2025, limiting bolt; 203, flip member; 2031, vertical plate; 2032, lifting cylinder; 2 033, flip motor; 2034, support seat; 2035, moving cylinder; 2036, suction plate; 2037, stabilizing plate; 204, positioning cylinder; 300, identification and rejection mechanism; 301, stand; 302, moving horizontal plate; 303, tilting member; 3031, top cylinder; 3032, level identification instrument; 3033, fixed lug; 3034, slide column; 3035, vacuum suction cup; 304, driving cylinder; 3041, piston rod body; 305, tilt identification instrument; 306, storage table; 307, rotating gear; 308, rotating motor; 309, fixed rack; 310, guide rail. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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] Example 1

[0039] See also Figure 1 - Figure 6 , the present invention provides a technical solution: a character printing process for a PCB board, specifically comprising the following steps;

[0040] S1, loading the prepared PCB board onto the conveying device 100, and moving the PCB board toward the inkjet printer 101 through the conveyor belt 103, and stopping at the inkjet printer 101;

[0041] S2, at this time, the PCB board is located inside the support and positioning mechanism 200, and the support and positioning mechanism 200 includes relatively distributed positioning members 202 and positioning cylinders 204, the positioning members 202 and positioning cylinders 204 are used to position the PCB board, and the inner surface of the conveyor belt 103 at the PCB board is supported by the support member 201, and the two positioning plates 2022 in the positioning member 202 are driven to move relatively while supporting the PCB board, contacting the two sides of the PCB board for positioning;

[0042] S3, the positioned PCB board is subjected to character printing by the printing gun 102 in the printing machine 101, and after the front side of the PCB board is processed, it is immediately cured by a UVLED light source;

[0043] S4, the cured PCB board is turned over by the turning member 203, and is positioned again by the positioning member 202 and the positioning cylinder 204, and the reverse side of the PCB board is again spray-printed with characters, and the processed PCB board is transported outwardly to the identification and rejection mechanism 300 by the conveying device 100;

[0044] S5. The front side of the PCB board is identified by the horizontal identification instrument 3032, and the PCB board is tilted by the tilting member 303 to cooperate with the tilt identification instrument 305 to identify the back side of the PCB board. The qualified PCB boards continue to be transported outward, and the unqualified PCB boards are placed on the storage table 306.

[0045] In this embodiment, preferably, the conveyor belt 103 is installed on the top of the conveying device 100, and the conveyor belt 103 horizontally passes through the inkjet printer 101, so as to facilitate the loading of the PCB board to the inkjet printer 101. The positioning member 202 is installed on the top of the supporting member 201 and can position both sides of the PCB board. The inner surface of the inkjet printer 101 is provided with a positioning cylinder 204 which is distributed opposite to the positioning member 202. The front end of the piston rod inside the positioning cylinder 204 is provided with a vertical plate, and the vertical plate can contact and position with the rear surface of the PCB board as the piston rod moves;

[0046] The support member 201 includes a mounting rod 2011 rotatably mounted on the surface of the conveying device 100 and located inside the conveyor belt 103. The upper and lower surfaces of the mounting rod 2011 are provided with support plates 2012 for supporting the inner surface of the conveyor belt 103. The outer ends of the support plates 2012 are arc-shaped. The support member 201 also includes a bidirectional screw rod 2016 for driving the two mounting rods 2011 to rotate.

[0047] The positioning member 202 includes two positioning plates 2022 slidably mounted on the bidirectional screw rod 2016 . The positions of the two positioning plates 2022 can move relative to or toward each other as the bidirectional screw rod 2016 rotates.

[0048] In this embodiment, preferably, the supporting member 201 also includes a fixed gear 2013 fixedly sleeved on the front end of the mounting rod 2011, and two movable seats 2014 are threadedly screwed on the bidirectional lead screw 2016. The movement of the movable seat 2014 can drive the meshing teeth 2015 to move, thereby meshing with the fixed gear 2013, driving the mounting rod 2011 to rotate a certain angle, so that the support plate 2012 is in a vertical state, supporting the inner surface of the conveyor belt 103, and the movement of the movable seat 2014 will drive the mounting plate 2021 and the positioning plate 2022 to move, and the space after the two positioning plates 2022 move just positions the two sides of the PCB board, and the meshing teeth 2015 meshing with the fixed gear 2013 are distributed on the lower surface of the movable seat 2014, and a driving motor 2017 is provided at one end of the bidirectional lead screw 2016.

[0049] In this embodiment, preferably, the positioning member 202 also includes a mounting plate 2021 arranged on the top of the moving seat 2014. The positioning member 202 can position the PCB board to facilitate the printing gun 102 to print the PCB board. An electric telescopic rod 2023 is arranged on the upper surface of the mounting plate 2021. The electric telescopic rod 2023 can change the longitudinal position of the positioning plate 2022 so that it does not affect the loading of the PCB board. The positioning plate 2022 is arranged at the rear end of the electric telescopic rod 2023, and a horizontal rail 2024 is arranged on the front surface of the moving seat 2014.

[0050] In this embodiment, preferably, the front end of the mounting plate 2021 is slidably sleeved on the cross rail 2024. The mounting plate 2021 changes its position on the cross rail 2024, which can drive the position of the positioning plate 2022 to change, thereby adapting to the size of the PCB board. A limiting bolt 2025 is screwed on the front end of the mounting plate 2021, and the limiting bolt 2025 can limit and fix the position of the mounting plate 2021.

[0051] In summary, when the PCB board is loaded to the inkjet printer 101, the driving motor 2017 works, driving the bidirectional screw rod 2016 to rotate, thereby driving the two moving seats 2014 arranged thereon to move relative to each other, and the surface of the moving seat 2014 is provided with corresponding limiting measures, and no deflection will occur, and it will only move along the bidirectional screw rod 2016, and the movement of the moving seat 2014 will drive the meshing teeth 2015 to move, and mesh with the fixed gear 2013, and drive the mounting rod 2011 to rotate until the rotation Ninety degrees, at this time, the support plate 2012 is in a vertical state, supporting the inner surface of the conveyor belt 103, so as to stably support the PCB board placed on the conveyor belt 103. When the support plate 2012 rotates to ninety degrees, the drive motor 2017 stops working, the bidirectional screw rod 2016 stops rotating, and the moving seat 2014 stops moving, keeping the support plate 2012 in a vertical supporting state. When the moving seat 2014 moves, it will drive the mounting plate 2021 and the positioning plate 2022 installed thereon to move. The electric telescopic rod 2023 extends to drive the positioning plate 2022 to move backward. When the moving seat 2014 stops working, the positioning plate 2022 just contacts the side of the PCB board. The two positioning plates 2022 stably position and clamp the PCB board, and the printing gun 102 can stably print the PCB board. After the front processing is completed, the driving motor 2017 drives the bidirectional screw rod 2016 to rotate in the opposite direction, and the moving seat 2014 moves in the opposite direction. The positioning plate 2022 is separated from the PCB board, and the flipping member 203 is used to adsorb and flip the PCB board. The flipped PCB board is placed on the conveyor belt 103. The positioning cylinder 204 positions the rear surface of the PCB board, and the driving motor 2017 rotates forward, driving the positioning plate 2022 to position and clamp the PCB board again, and the support plate 2012 supports the PCB board. After the front and back sides are processed, the electric telescopic rod 2023 drives the positioning plate 2022 to move forward, away from the PCB board, and does not affect the PCB board. Continue to be transported outward, the whole process increases the stability and accuracy of the PCB board being printed.

[0052] Example 2

[0053] Reference Figure 7 , which is the second embodiment of the present invention, and this embodiment is different from the previous embodiment.

[0054] In this embodiment, preferably, a flipping member 203 for flipping the PCB board is provided at the front end of the mounting rod 2011. The flipping member 203 can be used to quickly flip the PCB board placed on the conveyor belt 103, so as to facilitate the character printing process on the back of the PCB board. In combination with the positioning member 202, the PCB in the positive and negative positions can always be positioned, so as to increase the accuracy of the PCB board printing process. The flipping member 203 includes a vertical plate 2031 sleeved on the front end of the mounting rod 2011, and a lifting cylinder 2032 is provided on the inner side of the vertical plate 2031. The lifting cylinder 2032 can change the height of the support seat 2034, and the flipping member 2033 can be used to rotate the vertical plate 2031. The motor 2033 is fixed on the support base 2034 through the frame and can move synchronously. The support base 2034 is arranged on the upper end of the lifting cylinder 2032, and a moving cylinder 2035 is vertically arranged inside the support base 2034. The two are rotatably connected to facilitate the rotation of the moving cylinder 2035. A flip motor 2033 is arranged at the front end of the moving cylinder 2035, and an adsorption plate 2036 is vertically arranged at the rear end of the moving cylinder 2035. The adsorption plate 2036 can adsorb the PCB board. A stabilizing plate 2037 for supporting the lifting cylinder 2032 is arranged at the bottom of the vertical plate 2031, which supports the lifting cylinder 2032 and increases the working stability of the lifting cylinder 2032.

[0055] In summary, after the printing process on the front side of the PCB board is completed, the piston rod inside the lifting cylinder 2032 is in an extended state, and the inner rod inside the moving cylinder 2035 is extended to drive the suction plate 2036 to move backward until it is located above the PCB board, and then the piston rod inside the lifting cylinder 2032 is retracted to drive the suction plate 2036 to move downward to adsorb the PCB board. After adsorption, the lifting cylinder 2032 is used to move the PCB board upward for a distance to enable the PCB board to be flipped. The flip motor 2033 works to drive the moving cylinder 2035 to rotate 180 degrees to flip the PCB board. The lifting cylinder 2032 drives the PCB board to move downward and place it on the conveyor belt 103, and then the rod extended by the positioning cylinder 204 is used to push the PCB board to a suitable position, and the two positioning plates 2022 in the positioning member 202 position the two sides of the PCB board. The positioned PCB board is printed by the printer 101, and during the printing process, the moving cylinder 2035 and the suction plate 2036 are located on the outside, which does not affect the printing process of the PCB board.

[0056] Example 3

[0057] Reference Figure 8 and Fig. 9 , which is the third embodiment of the present invention.

[0058] In the present embodiment, preferably, the identification and rejection mechanism 300 includes a material storage table 306 located behind the conveying device 100. By providing the identification and rejection mechanism 300, it is possible to quickly identify whether the characters on the front and back sides of the PCB board are qualified, and the qualified and unqualified PCB boards are processed and stored separately, thereby increasing the convenience of PCB printing processing, and preventing product mixing, reducing the trouble of subsequent manual identification and sorting, and a stand 301 is provided on the rear surface of the material storage table 306. A movable horizontal plate 302 is slidably provided on the top of the stand 301, and the movable horizontal plate 302 can move along the stand 301. A driving cylinder 304 is provided on the upper surface of the front end of the movable horizontal plate 302, and a tilting member 303 is connected to the lower end of the driving cylinder 304. A tilting recognition device 305 is tiltedly provided on the outer side of the movable horizontal plate 302, and the tilting recognition device 305 can identify and detect the back side of the PCB board.

[0059] In this embodiment, preferably, a level recognition instrument 3032 is provided below the driving cylinder 304, and the level recognition instrument 3032 can be used to detect the characters on the front side of the PCB board to see whether the characters are qualified. The tilting member 303 also includes a top cylinder 3031 provided on the side of the front end of the movable horizontal plate 302, and the top cylinder 3031 is rotatably connected to the side of the level recognition instrument 3032. The extension of the internal rod of the top cylinder 3031 can drive the level recognition instrument 3032 to rotate to one side. A piston rod body 3041 is provided inside the driving cylinder 304, and a vacuum suction cup 3035 is provided on the lower surface of the level recognition instrument 3032, which can adsorb the PCB board. A fixed lug 3033 is provided on the upper surface of the level recognition instrument 3032, and a sliding column 3034 rotatably connected to the fixed lug 3033 is provided at the end of the piston rod body 3041. A rectangular hole for the sliding column 3034 to slide is opened on the surface of the fixed lug 3033, and the rectangular hole and the sliding column 3034 can cooperate to adapt to the tilting of the level recognition instrument 3032.

[0060] In this embodiment, preferably, a guide rail 310 that movably passes through the stand 301 is provided on the lower surface of the movable cross plate 302. The guide rail 310 can be T-shaped and is slidably connected to the stand 301 while not being easily detached up and down, thereby supporting the movable cross plate 302. A fixed rack 309 is provided on the upper surface of the movable cross plate 302. A rotating gear 307 is meshed with the fixed rack 309. A rotating motor 308 connected to the rotating gear 307 is provided on the side of the stand 301. The rotating motor 308 can drive the rotating gear 307 to rotate, thereby driving the fixed rack 309 meshed with it and the movable cross plate 302 to move, thereby driving the adsorbed PCB to move backward and be placed on the storage table 306.

[0061] In summary, after the PCB board is printed, it is further conveyed to the identification and rejection mechanism 300, and the horizontal recognition instrument 3032 recognizes and detects the front of the PCB board. After the front is qualified, the drive cylinder 304 works, and the internal piston rod extends to drive the horizontal recognition instrument 3032 to move downward, and the internal rod of the top cylinder 3031 extends accordingly, until the vacuum suction cup 3035 contacts the PCB board and adsorbs it, the piston rod retracts and drives the PCB board to move upward to a suitable height, and the internal rod of the top cylinder 3031 retracts to a certain extent. At this time, the internal rod of the top cylinder 3031 extends, while the internal piston rod of the driving cylinder 304 does not move, and the internal rod of the top cylinder 3031 drives one side of the horizontal recognition instrument 3032 downward and the other side upward, driving the fixed lug 3033 to slide and deflect along the sliding column 3034, driving the adsorbed The PCB board is tilted so that the back side of the PCB board faces the tilt identification instrument 305 for detection. If it is qualified, the internal rod of the top cylinder 3031 is retracted to make the horizontal identification instrument 3032 and the PCB board horizontal, and then the driving cylinder 304 moves the PCB board downward and places it back on the conveyor belt 103. The vacuum suction cup 3035 is separated from the PCB board and is conveyed outward by the conveyor belt 103 to the next process; if the PCB board is unqualified, after the PCB board is horizontal, the rotating motor 308 drives the rotating gear 307 to rotate, so that the fixed rack 309 and the movable cross plate 302 engaged therewith move backward until they move to above the storage table 306, and the PCB board is placed downward on the storage table 306, so as to realize rapid screening and rejection of PCB board products, and the double-sided identification detection is more accurate.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A character printing process for a PCB board, characterized in that: Specifically include the following steps: S1, loading the prepared PCB board onto the conveying device (100), and moving the PCB board toward the inkjet printer (101) via the conveyor belt (103), and stopping at the inkjet printer (101); S2, at this time, the PCB board is located inside the support positioning mechanism (200), and the support positioning mechanism (200) comprises relatively distributed positioning members (202) and positioning cylinders (204), the positioning members (202) and positioning cylinders (204) are used to position the PCB board, and the support member (201) is used to support the inner surface of the conveyor belt (103) at the PCB board, and the two positioning plates (2022) in the positioning member (202) are driven to move relative to each other while contacting the two sides of the PCB board for positioning; S3, the positioned PCB board is subjected to character printing by the printing gun (102) in the printing machine (101), and after the front side of the PCB board is processed, it is immediately cured by a UVLED light source; S4, the solidified PCB board is turned over by the turning member (203), and is positioned again by the positioning member (202) and the positioning cylinder (204), and the back side of the PCB board is spray-printed with characters again, and the processed PCB board is transported outwardly to the identification and rejection mechanism (300) by the conveying device (100); S5, the front side of the PCB board is identified by the horizontal identification instrument (3032), and the PCB board is tilted by the tilting member (303) to cooperate with the tilt identification instrument (305) to identify the back side of the PCB board, and the qualified PCB boards continue to be transported outward, while the unqualified PCB boards are placed on the storage table (306); The conveyor belt (103) is installed on the top of the conveying device (100), and the conveyor belt (103) horizontally passes through the inkjet printer (101); the positioning member (202) is installed on the top of the supporting member (201) and can position both sides of the PCB board; and the inner surface of the inkjet printer (101) is provided with a positioning cylinder (204) distributed opposite to the positioning member (202); The support member (201) comprises a mounting rod (2011) rotatably mounted on the surface of the conveying device (100) and located inside the conveyor belt (103); the upper and lower surfaces of the mounting rod (2011) are provided with support plates (2012) for supporting the inner surface of the conveyor belt (103); the support member (201) further comprises a bidirectional screw rod (2016) for driving the two mounting rods (2011) to rotate; The positioning member (202) comprises two positioning plates (2022) slidably mounted on a bidirectional screw rod (2016); The support member (201) further comprises a fixed gear (2013) fixedly sleeved on the front end of the mounting rod (2011); two movable seats (2014) are screwed and sleeved on the bidirectional screw rod (2016); meshing teeth (2015) meshing with the fixed gear (2013) are distributed on the lower surface of the movable seat (2014); and a driving motor (2017) is arranged at one end of the bidirectional screw rod (2016); The positioning member (202) further comprises a mounting plate (2021) arranged on the top of the movable seat (2014); an electric telescopic rod (2023) is arranged on the upper surface of the mounting plate (2021); a positioning plate (2022) is arranged at the rear end of the electric telescopic rod (2023); and a transverse rail (2024) is arranged on the front surface of the movable seat (2014).

2. The character printing process for a PCB board according to claim 1, characterized in that: The front end of the mounting plate (2021) is slidably sleeved on the cross rail (2024), and the front end of the mounting plate (2021) is screwed with a limiting bolt (2025).

3. The character printing process for a PCB board according to claim 2, characterized in that: A flipping component (203) for flipping the PCB board is arranged at the front end of the mounting rod (2011); the flipping component (203) comprises a vertical plate (2031) sleeved on the front end of the mounting rod (2011); a lifting cylinder (2032) is arranged on the inner side of the vertical plate (2031); a support seat (2034) is arranged at the upper end of the lifting cylinder (2032); a moving cylinder (2035) is vertically arranged inside the support seat (2034); and a flipping motor (2033) is arranged at the front end of the moving cylinder (2035).

4. The character printing process for a PCB board according to claim 3, characterized in that: A suction plate (2036) is vertically arranged at the rear end of the moving cylinder (2035), and a stabilizing plate (2037) for supporting the lifting cylinder (2032) is arranged at the bottom of the vertical plate (2031).

5. The character printing process for a PCB board according to claim 1, characterized in that: The identification and rejection mechanism (300) comprises a material storage platform (306) located behind the conveying device (100); a stand (301) is arranged on the rear surface of the material storage platform (306); a movable horizontal plate (302) is slidably arranged on the top of the stand (301); a driving cylinder (304) is arranged on the upper surface of the front end of the movable horizontal plate (302); a tilting member (303) is connected to the lower end of the driving cylinder (304); and a tilt identification instrument (305) is tiltedly arranged on the outer side of the movable horizontal plate (302).

6. The character printing process for a PCB board according to claim 5, characterized in that: A level identification instrument (3032) is arranged below the driving cylinder (304); the tilting member (303) further comprises a top cylinder (3031) arranged on the side of the front end of the movable horizontal plate (302); the top cylinder (3031) is rotatably connected to the side of the level identification instrument (3032); a piston rod body (3041) is arranged inside the driving cylinder (304); a vacuum suction cup (3035) is arranged on the lower surface of the level identification instrument (3032); a fixing lug (3033) is arranged on the upper surface of the level identification instrument (3032); and a sliding column (3034) rotatably connected to the fixing lug (3033) is arranged at the end of the piston rod body (3041).

7. The character printing process for a PCB board according to claim 6, characterized in that: The lower surface of the movable horizontal plate (302) is provided with a guide rail (310) that movably penetrates the vertical seat (301); the upper surface of the movable horizontal plate (302) is provided with a fixed rack (309); a rotating gear (307) is meshed on the fixed rack (309); and a rotating motor (308) connected to the rotating gear (307) is provided on the side of the vertical seat (301).

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