Automatic printing equipment for PCBA (printed circuit board assembly) processing and printing process thereof

Abstract

The invention relates to the electronic circuit manufacturing technology, and discloses automatic printing equipment for PCBA board processing and a printing technology thereof.The automatic printing equipment comprises a rack and conveying tables located on the two sides of the rack, a printing table and a printing table are arranged on the rack, the printing table and the two conveying tables are located on the same horizontal line, the printing table is located over the printing table, and the printing table is located above the printing table; a screen printing steel mesh and a solder paste dipping mechanism are arranged on the printing table, an identification probe is arranged at the bottom of the printing table in a sliding mode, a lifting mechanism is arranged in the rack and comprises a driving block, a jacking piece and a multi-stage air cylinder driving the driving block to slide, and a plurality of guide columns vertically penetrating through the bottom plate in a sliding mode are distributed at the bottom of the printing table. The supporting piece is connected to the bottom of the printing table, a conveying platform, a verification platform and a tin coating platform are sequentially arranged on the driving block in the sliding direction, the conveying platform and the verification platform are in transition connection through an inclined face, and the verification platform and the tin coating platform are in transition connection through an inclined face. The device has the effect of improving the production efficiency of the PCBA silk-screen solder paste.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuit manufacturing, and in particular to automatic printing equipment and a printing process thereof for PCBA board processing. Background Art

[0002] In the field of electronic manufacturing, the production of PCBA boards plays a vital role in the quality and performance of electronic products. In particular, in the processing of PCBA boards, the solder paste printing process is particularly critical. This process directly determines the distribution of solder paste on the PCBA board, which in turn affects the subsequent welding effect and the performance of the final product. Therefore, efficient solder paste printing equipment and technology have always been the focus of attention in the electronic manufacturing industry. With the increasingly obvious trend of miniaturization and integration of electronic products, higher requirements are placed on the accuracy and consistency of solder paste printing. Although the existing automatic printing equipment has improved production efficiency and quality to a certain extent, there are still some problems that need to be solved.

[0003] In the process of PCBA board processing, commonly used automatic printing equipment mainly uses hydraulic or pneumatic devices to achieve the lifting of PCBA board and the docking of screen printing steel mesh. These devices are usually equipped with simple linear motion mechanisms, which control the up and down movement of PCBA board by cylinders or hydraulic cylinders. In addition, in order to ensure the accurate alignment of PCBA board and screen printing steel mesh, some equipment will also use visual recognition system to assist correction. However, these methods still face a series of challenges in practical applications. First, simple pneumatic or hydraulic devices have certain limitations in control accuracy, usually only able to achieve an accuracy of about ±0.1mm, which is far from enough for high-precision solder paste printing. Secondly, since PCBA board may be subjected to horizontal force during the lifting process, its horizontality changes, thereby affecting the uniformity of contact with screen printing steel mesh. In addition, vertical displacement error may also cause the pad to be unable to accurately align with the opening of screen printing steel mesh, causing problems such as solder paste leakage or offset.

[0004] Although the existing automatic printing equipment has solved the docking problem between the PCBA board and the screen printing steel mesh to a certain extent, there are still significant defects in practical applications. The first is the lack of accuracy, especially in terms of horizontality and vertical displacement. The existing pneumatic or hydraulic devices are difficult to meet the high-precision requirements, resulting in unstable solder paste printing quality. Secondly, there is a lack of effective real-time correction mechanism. Once a docking deviation occurs, it cannot be adjusted in time. The problem can only be discovered through testing after printing is completed, which not only increases the scrap rate, but also seriously affects production efficiency. The existence of these problems limits the widespread application of automatic printing equipment in the field of high-end electronic manufacturing, and new technical solutions are urgently needed to solve these problems. Summary of the invention

[0005] In order to improve the production efficiency of screen printing solder paste on PCBA boards, the present application provides an automatic printing device for PCBA board processing and a printing process thereof.

[0006] The automatic printing equipment and printing process for PCBA board processing provided in this application adopt the following technical solutions: Automatic printing equipment for PCBA board processing, comprising a frame and a conveying table arranged at the same height on both sides of the frame, a printing table and a printing table are arranged on the frame, the printing table and the two conveying tables are located on the same horizontal line, the printing table is located directly above the printing table, a silk screen steel mesh and a solder paste dipping mechanism are arranged on the printing table, an identification probe for identifying a check point on the PCBA board is slidably arranged at the bottom of the printing table, a lifting mechanism for driving the printing table to rise and fall is arranged in the frame, the lifting mechanism comprises a driving block slidably arranged on the bottom plate of the frame in a horizontal direction, a top support member slidably arranged on the top of the driving block, and a multi-stage cylinder driving the driving block to slide, a plurality of guide columns vertically slidingly penetrating the bottom plate of the frame are arranged at the bottom of the printing table, the top support member is connected to the bottom of the printing table, a conveying platform, a checking platform and a tinning platform are sequentially arranged on the driving block along the sliding direction, and the conveying platform and the checking platform, the checking platform and the tinning platform are all connected through an inclined transition.

[0007] By adopting the above technical solution, a multi-stage cylinder is used as a power source, which can provide a stable and precisely controllable driving force to push the driving block to slide on the bottom plate inside the frame. The conveying platform, the verification platform and the tinning platform at different positions on the driving block, together with the limit of the printing table by the guide column and the transition connection of the inclined surface, realize the precise stop of the printing table at different height positions. For example, during verification, the printing table can be accurately lifted to a height where the recognition probe can accurately identify the verification point; during tinning, the printing table can be accurately lifted to a height where the PCBA board and the screen printing steel mesh fit well, ensuring the positioning accuracy of each link in the printing process and effectively improving the consistency and quality of solder paste printing. At the same time, the inclined surface transition connection enables the printing table to smoothly transition when switching between different platforms, reducing the shaking or displacement of the PCBA board caused by sudden lifting or position switching, further ensuring the stability of the printing process, and reducing the impact of errors caused by mechanical movement on printing quality.

[0008] Optionally, the top support member includes a top support frame fixedly arranged at the bottom of the printing platform and a pressure roller rotatably arranged at the bottom end of the top support frame. The length direction of the top support frame is perpendicular to the sliding direction of the driving block, and the side wall of the pressure roller is always arranged to contact with the top wall of the driving block.

[0009] By adopting the above technical solution, the top support frame can evenly disperse the pressure from the printing table to ensure the stability of the printing table during the lifting process. The pressure roller set between the bottom ends of the top support frame is rotated to contact the top wall of the driving block, converting the sliding friction into rolling friction, which greatly reduces the friction between the top support member and the driving block. This not only reduces the wear of components and extends the service life of the equipment, but also makes the printing table smoother during the lifting process, can respond more accurately to the drive of the multi-stage cylinder, improves the movement accuracy and response speed of the entire lifting mechanism, and is conducive to improving printing quality and efficiency.

[0010] Optionally, the driving block is provided with limiting plates on opposite side walls on both sides of its own sliding direction, and a limiting groove is formed on the limiting plate along the moving path of the rotating shaft of the pressure roller. The end of the rotating shaft of the pressure roller extending out of the side wall of the top support frame is inserted into the limiting groove and slides with the limiting groove.

[0011] By adopting the above technical solution, the limiting groove on the limiting plate limits the end of the rotating shaft of the pressure roller extending out of the side wall of the top support frame, preventing the pressure roller from axially displacing during the rolling process, thereby ensuring the stability and reliability of the rolling contact between the pressure roller and the driving block. This stable contact relationship is crucial for the precise lifting of the printing table, because any abnormal movement of the pressure roller may cause uneven force on the printing table or a slight displacement deviation, thereby affecting the docking accuracy and printing quality of the PCBA board and the screen printing steel mesh.

[0012] Optionally, the printing platform has a plurality of guide rollers distributed and rotatable along the conveying direction of the conveying platform, a seating groove is opened on the printing platform corresponding to each guide roller, the guide roller is rotatably arranged in the seating groove, and the side wall of the guide roller extends from the seating groove to the top wall of the printing platform, the guide roller extends out of the printing platform and is sleeved with a synchronous wheel on the rotating shaft, a plurality of synchronous wheels are meshed with each other and are sleeved with a synchronous belt, and a rotating motor is arranged on the printing platform to drive one of the guide rollers to rotate.

[0013] By adopting the above technical solution, when the PCBA board is on the printing table, the guide roller can provide it with precise transmission guidance. The rotating motor drives one of the guide rollers to rotate, and through the transmission of the synchronous wheel and the synchronous belt, all the guide rollers rotate synchronously to ensure that the movement direction of the PCBA board on the printing table is accurate and stable. In the process of the PCBA board entering the printing table, positioning on the printing table, and output after printing, the role of the guide roller can effectively prevent the PCBA board from offsetting or jamming, ensuring the accuracy and smoothness of the conversion of the PCBA board between various processes, improving the automation and production efficiency of the entire printing process, and also helping to improve the accuracy of the printing position.

[0014] Optionally, a baffle is provided on the top of the printing table on one side of the PCBA board output direction, and when the baffle is raised, the height of the baffle is lower than the thickness of the PCBA board.

[0015] By adopting the above technical solution, the liftable baffle is set on one side of the PCBA board output direction. When the baffle is raised, its height is lower than the thickness of the PCBA board. When the PCBA board is transported to the printing table along with the conveyor table, the baffle can play a role of blocking and positioning, so that the PCBA board can accurately stay at the predetermined position on the printing table, avoiding the inaccurate position of the PCBA board caused by the inertia of the transmission or other factors. Accurate positioning helps the subsequent verification point identification, printing and other processes to accurately operate at the corresponding position of the PCBA board, improving the accuracy and reliability of the entire printing process.

[0016] Optionally, the solder paste dipping mechanism includes a solder paste storage box and a coating component, and a U-shaped slide groove is correspondingly opened on the opposite side walls in the printing table, a slider is slidably arranged in the slide groove, the slider is connected to the end wall of the solder paste storage box, and a driving member for driving the solder paste storage box to move along the groove of the slide groove is arranged on the frame, and the coating component includes a flexible scraper and a tin coating roller arranged in parallel, and the flexible scraper and the tin coating roller are distributed along the width direction of the solder paste storage box. When the slider is located in the lower groove section of the slide groove, the flexible scraper and the tin coating roller both contact the silk screen steel mesh, and the flexible scraper is located behind the rolling direction of the tin coating roller.

[0017] By adopting the above technical solution, the solder paste storage box is connected to the sliding groove in the printing table through the slider, and is driven by the driving member on the frame to move along the groove, so as to realize the flexible movement of the solder paste storage box on the printing table. This movement mode can adjust the position of the solder paste storage box according to the printing state, so that it can better cooperate with the screen printing steel mesh and PCBA board. When the slider is located in the lower groove section of the groove, the solder paste overflows from the gap between the tin outlet of the solder paste storage box and the tin coating roller, and is evenly coated on the screen printing steel mesh as the tin coating roller rolls. The tin coating roller can make the solder paste initially form a relatively uniform layer on the screen printing steel mesh. The flexible scraper follows closely behind the rolling direction of the tin coating roller to scrape off the excess solder paste on the screen printing steel mesh, so that the solder paste can be more accurately leaked through the mesh of the screen printing steel mesh onto the PCBA board, which not only ensures the uniformity of the solder paste coating, but also effectively controls the thickness of the solder paste, improves the quality and accuracy of solder paste printing, and reduces welding defects caused by too much or too little solder paste.

[0018] Optionally, the bottom of the solder paste storage box is V-shaped along its width direction, and the bottom end of the V is provided with a tin outlet along its length direction, the tin coating roller is rotatably connected to the tin outlet, and the two opposite inner walls along the length direction of the solder paste storage box are vertically provided with adjustment grooves, and a limit block is slidably arranged in the adjustment groove, and the limit block is sleeved on the end of the rotating shaft of the tin coating roller, and each adjustment groove is provided with a spring that abuts between the top wall of the adjustment groove and the limit block.

[0019] By adopting the above technical solution, the bottom of the solder paste storage box is set in a V-shape and a tin outlet is opened at the bottom. This shape is conducive to the solder paste converging to the tin outlet under the action of gravity, which is convenient for the outflow and control of the solder paste. The limit block and spring in the adjustment groove are set at the end of the tin coating roller shaft. When the spring is in a natural state, the tin coating roller achieves a closing effect on the tin outlet. When tinning is required, by sliding the slider on the solder paste storage box to the lower groove section of the slide groove, the tin coating roller is in conflict with the silk screen steel mesh, and the tin coating roller overcomes the spring force and moves to a certain extent, so that the solder paste can overflow from the gap between the tin outlet and the tin coating roller. This structure can accurately control the outflow of solder paste, further improve the accuracy and stability of solder paste printing, and reduce the waste of solder paste and printing quality problems caused by improper control of the amount of solder paste.

[0020] The printing process of the automatic printing equipment for PCBA board processing includes the following steps: S1. Place the PCBA board to be printed with solder paste on the conveyor table, and transport it to the printing table for precise positioning; S2. The multi-stage cylinder pushes the pressure roller under the printing table to the verification platform, and the identification probe identifies the verification points of the PCBA board; S3. After confirming that the recognition is correct, the multi-stage cylinder further pushes the CBA board to fit the screen printing steel mesh and print the solder paste; S4. The tin-coating roller applies solder paste on the screen printing steel mesh, and the flexible scraper scrapes off the excess solder paste on the screen printing steel mesh, and prints the solder paste from the mesh holes of the screen printing steel mesh to the PCBA board; S5. The multi-stage cylinder drives the printing table down to be flush with the conveyor table, the guide roller rotates and outputs the PCBA board, and the PCBA board is transported away from the frame by the downstream conveyor table.

[0021] By adopting the above technical solution, S1. Precise positioning: Through the setting of the baffle, the PCBA board is accurately positioned on the conveyor table, ensuring the accuracy of subsequent checkpoint identification and printing operations.

[0022] S2. Efficient verification: The multi-stage cylinder pushes the drive block to slide, so that the printing table can stop accurately at different heights. Especially on the verification platform, the recognition probe can accurately identify the verification points on the PCBA board to ensure that the verification points are correct.

[0023] S3. High-precision printing: The printing table is precisely lifted on the tin-coating platform, so that the PCBA board and the screen printing steel mesh fit closely, ensuring the uniform coating and precise skipping of solder paste during the printing process, thus improving the printing quality.

[0024] S4. Automatic control: The solder paste storage box is driven to move along the slide by the driving part. The flexible scraper and the tin coating roller are used together to ensure the uniform coating of solder paste on the screen printing steel mesh and the removal of excess solder paste, thereby improving the consistency and efficiency of printing.

[0025] S5. Stable transmission: The multi-stage cylinder retracts the piston rod, the printing table descends and is flush with the conveying table, the baffle is retracted, and the guide roller rotates, driving the PCBA board to move smoothly to the conveying table at the output end, avoiding the deviation or jamming of the PCBA board during the transmission process, ensuring the smoothness and reliability of the entire printing process.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The multi-stage cylinder as a power source can provide a stable and precisely controllable driving force to push the driving block to slide on the bottom plate of the frame, so that the printing table can stay accurately at different heights, ensuring the precise docking of the PCBA board and the screen printing steel mesh, effectively improving the consistency and quality of solder paste printing; 2. The design of the inclined transition connection enables the printing table to smoothly transition between different platforms, reducing the shaking or displacement of the PCBA board caused by sudden lifting or position switching, further ensuring the stability of the printing process and reducing the impact of errors caused by mechanical movement on printing quality; 3. The limiting effect of the guide column on the printing table, combined with the precise control of the multi-stage cylinder, can keep the printing table stable at different heights, ensuring the positioning accuracy of the PCBA board throughout the printing process, and effectively solving the horizontal deviation and vertical displacement error problems existing in traditional equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view showing the internal structure of the frame in the embodiment of the present application.

[0029] Figure 3 It is a cross-sectional view showing the connection relationship between the support plate and the solder paste storage box in the embodiment of the present application.

[0030] Figure 4 It is a cross-sectional view showing the internal structure of the solder paste storage box in the embodiment of the present application.

[0031] Figure 5 It is a cross-sectional view showing the positional relationship between the printing platform and the guide roller in the embodiment of the present application.

[0032] Description of reference numerals: 01, PCBA board; 1, frame; 11, drive; 111, transmission block; 112, lead screw; 113, drive motor; 114, lifting cylinder; 12, support plate; 2, conveyor; 3, printing table; 31, slide; 311, slider; 4, screen printing steel mesh; 5, solder paste dipping mechanism; 51, solder paste storage box; 511, tin outlet; 512, adjustment slot; 5121, limit block; 5122, spring; 513, heating rod; 5131, stirring blade; 514, stirring motor; 515, tin filling port; 52, coating Covering parts; 521, flexible scraper; 522, tin-coating roller; 6, printing table; 61, guide column; 62, placement groove; 63, baffle; 64, micro cylinder; 7, lifting mechanism; 71, drive block; 711, conveying platform; 712, verification platform; 713, tin-coating platform; 714, limit plate; 7141, limit groove; 72, top support member; 721, top support frame; 722, pressure roller; 73, multi-stage cylinder; 8, identification probe; 9, guide roller; 91, synchronous wheel; 911, synchronous belt; 912, rotating motor. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The embodiment of the present application discloses an automatic printing device for PCBA board processing and a printing process thereof.

[0035] Reference Figure 1 and Figure 2 The automatic printing equipment for PCBA board processing includes a frame 1, and both sides of the frame 1 are fixedly provided with conveying tables 2 of equal height. A printing table 3 is fixedly provided on the top of the frame 1, and a silk screen steel mesh 4 and a solder paste dipping mechanism 5 are provided in the printing table 3. A printing table 6 is provided in the frame 1 directly below the printing table 3. The printing table 6 and the two conveying tables 2 are located on the same horizontal line, and a plurality of guide pillars 61 that vertically slide through the bottom plate are arranged at the bottom of the printing table 6. In this embodiment, one guide pillar 61 is provided at each of the four corners of the bottom of the printing table 6. A lifting mechanism 7 for raising the height of the printing table 6 is also provided in the frame 1, and an identification probe 8 is slidably provided at the bottom of the printing table 3. The identification probe 8 is used to check whether the position of the point on the PCBA board 01 is accurate.

[0036] Reference Figure 1 and Figure 2The silk-screen steel mesh 4 is fixedly arranged in the middle of the printing table 3, and its printing mesh holes are connected to the inside of the chassis. The solder paste dipping mechanism 5 includes a solder paste storage box 51 and a coating component 52. A U-shaped slide groove 31 is correspondingly opened on the opposite side walls of the printing table 3. A slider 311 is slidably arranged in the slide groove 31. The slider 311 is fixedly arranged on the end wall of the solder paste storage box 51, and a driving member 11 for driving the solder paste storage box 51 to move along the groove of the slide groove 31 is arranged on the frame 1.

[0037] Reference Figure 1 and 3 A support plate 12 is fixedly provided on one side of the top of the frame 1. The driving member 11 in this embodiment includes a transmission block 111, a screw rod 112, a driving motor 113 and a lifting cylinder 114. The screw rod 112 is rotatably arranged on the support plate 12 parallel to the length direction of the slide groove 31. The transmission block 111 is limited in the support plate 12 and is arranged on the screw rod 112 through a threaded sleeve. The driving motor 113 is fixedly arranged on the support plate 12, and its output shaft is coaxially fixedly connected with the screw rod 112. The cylinder body of the lifting cylinder 114 is fixedly arranged on the bottom wall of the transmission block 111, and the bottom end of the piston rod is fixedly connected to the top wall of the solder paste storage box 51.

[0038] Reference Figure 3 The coating component 52 includes a flexible scraper 521 and a tin coating roller 522 which are arranged in parallel. The flexible scraper 521 and the tin coating roller 522 are distributed along the width direction of the solder paste storage box 51. When the slider 311 is located in the lower groove section of the slide groove 31, the flexible scraper 521 and the tin coating roller 522 both abut against the silk screen steel mesh 4, and the flexible scraper 521 is located behind the tin coating roller 522 in the rolling direction, and is fixedly set on the side wall of the solder paste storage box 51.

[0039] Reference Figure 3 and Figure 4 The bottom of the solder paste storage box 51 is V-shaped along its width direction, and the bottom end of the V-shape is provided with a tin outlet 511 along its length direction. The tin coating roller 522 is rotatably connected to the tin outlet 511. Adjustment grooves 512 are vertically provided on the two opposite inner walls along the length direction of the solder paste storage box 51. A limit block 5121 is slidably provided in the adjustment groove 512. The limit block 5121 is fixedly sleeved on the end of the rotating shaft of the tin coating roller 522, and each adjustment groove 512 is provided with a spring 5122 that abuts against the inner top wall of the adjustment groove 512 and the limit block 5121. When the spring 5122 is in a natural state, the tin coating roller 522 achieves a closing effect on the tin outlet 511.

[0040] Reference Figure 3 and Figure 4In order to prevent the solder paste in the solder paste storage box 51 from solidifying and blocking the solder outlet 511, a heating rod 513 is rotatably arranged in the solder paste storage box 51 in parallel with its own length direction, and a stirring blade 5131 is fixedly arranged around the heating rod 513. A stirring motor 514 is fixedly arranged on the outer wall of the solder paste storage box 51. The output shaft of the stirring motor 514 is rotatably arranged in the solder paste storage box 51 and is coaxially fixedly connected with the heating rod 513. A solder filling port 515 is also fixedly arranged on the top of the solder paste storage box 51.

[0041] Reference Figure 2 and Figure 5 A plurality of guide rollers 9 are distributed and rotated on the printing table 6 along the conveying direction of the conveying table 2. In this embodiment, two guide rollers are taken as an example. A placement groove 62 is opened on the printing table 6 corresponding to each guide roller 9. The guide roller 9 is rotatably arranged in the placement groove 62, and the side wall of the guide roller 9 extends from the placement groove 62 to the top wall of the printing table 6. The guide roller 9 extends out of the rotating shaft of the printing table 6 and is fixedly sleeved with a synchronous wheel 91. A synchronous belt 911 is meshed together on the two synchronous wheels 91, and a rotating motor 912 is fixedly arranged on the printing table 6. The output shaft of the rotating motor 912 is coaxially fixedly connected to one of the guide rollers 9.

[0042] Reference Figure 2 and Figure 5 The top of the printing platform 6 is located on one side of the output direction of the PCBA board 01, and a baffle 63 is lifted. When the baffle 63 is lifted, the height of the baffle 63 is lower than the thickness of the PCBA board 01. The lifting of the baffle 63 is realized by a micro cylinder 64, which is embedded in the printing platform 6. After the PCBA board 01 is printed, when it needs to be transferred out of the rack 1, the baffle 63 is retracted into the printing platform 6.

[0043] Reference Figure 2 and Figure 5 The lifting mechanism 7 includes a driving block 71, a top support member 72 and a multi-stage cylinder 73. The driving block 71 is slidably arranged on the bottom plate of the frame 1 in the horizontal direction. A conveying platform 711, a checking platform 712 and a tinning platform 713 are sequentially arranged on the top surface of the driving block 71 along the sliding direction, and the conveying platform 711 and the checking platform 712, the checking platform 712 and the tinning platform 713 are all connected by an inclined transition.

[0044] Reference Figure 2 and Figure 5The top support member 72 includes a top support frame 721 and a pressure roller 722. The length direction of the top support frame 721 is perpendicular to the sliding direction of the driving block 71 and is fixedly arranged at the bottom of the printing table 6. The pressure roller 722 is supported on the top wall of the driving block 71 and is rotatably arranged at the bottom end of the top support frame 721. The opposite side walls of the driving block 71 along its own sliding direction are bolted to the limit plates 714. Each limit plate 714 is provided with a limit groove 7141 along the moving path of the rotation axis of the pressure roller 722. The end of the rotation axis of the pressure roller 722 extending out of the side wall of the top support frame 721 is inserted into the limit groove 7141 and slides with the limit groove 7141.

[0045] Reference Figures 1 to 5 The printing process of the automatic printing equipment for PCBA board processing includes the following steps: S1, placing the PCBA board 01 to be printed with solder paste on the conveying table 2, and conveying it to the printing table 6 along the conveying table 2, and under the action of the baffle 63, the PCBA board 01 is accurately positioned; S2, the multi-stage cylinder 73 pushes the driving block 71 to slide, and under the limit of the guide column 61 and the driving of the inclined surface, the supporting frame 721 supports the printing table 6 to rise until the pressing roller 722 presses on the verification platform 712. At this time, the identification probe 8 moves to the top of the PCBA board 01 to identify the verification point; S3. After the verification point is correctly identified, the multi-stage cylinder 73 further pushes the driving block 71 to slide, and the supporting frame 721 supports the printing table 6 to rise until the pressing roller 722 presses on the tin coating platform 713. At this time, the top surface of the PCBA board 01 is in contact with the bottom surface of the screen printing steel mesh 4, and the printing operation is performed; S4, the driving member 11 drives the solder paste storage box 51 to move along the groove of the slide groove 31. When the slider 311 is located in the lower groove section of the slide groove 31, the flexible scraper 521 and the tin coating roller 522 both contact the screen printing steel mesh 4, and the solder paste overflows from the gap between the tin outlet 511 and the tin coating roller 522, and is coated on the screen printing steel mesh 4 as the tin coating roller 522 rolls. The flexible scraper 521 closely follows the rear of the tin coating roller 522 to scrape off the excess solder paste on the screen printing steel mesh 4, and the solder paste leaks from the mesh of the screen printing steel mesh 4 to the PCBA board 01; S5, the multi-stage cylinder 73 retracts the piston rod, pulls back the driving block 71, and the printing table 6 drives the PCBA board 01 to descend to be flush with the conveying table 2, the baffle 63 is retracted, and the guide roller 9 rotates, driving the PCBA board 01 to move to the conveying table 2 at the output end, and leaves the frame 1 with the conveying of the conveying table 2.

[0046] The implementation principle of the automatic printing equipment for PCBA board processing and its printing process in the embodiment of the present application is: a multi-stage cylinder 73 is used as a power source to push the drive block 71 to slide on the bottom plate. The guide column 61 is used to limit the printing table 6 and the transition connection of the inclined surface to achieve the precise stop of the printing table 6 at different heights. When it is necessary to calibrate the PCBA board 01, the printing table 6 is accurately lifted to a height where the identification probe 8 can accurately identify the calibration point; when it is necessary to tin the PCBA board 01, the printing table 6 is accurately lifted to a height where the PCBA board 01 and the silk screen steel mesh 4 fit well, ensuring the positioning accuracy of each link in the printing process and effectively improving the consistency and quality of solder paste printing.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Automatic printing equipment for PCBA board processing, characterized by , comprising a frame (1) and a conveying platform (2) arranged at the same height on both sides of the frame (1), the frame (1) being provided with a printing platform (6) and a printing platform (3), the printing platform (6) and the two conveying platforms (2) being located on the same horizontal line, the printing platform (3) being located directly above the printing platform (6), the printing platform (3) being provided with a screen printing steel mesh (4) and a solder paste dipping mechanism (5), the bottom of the printing platform (3) being slidably provided with an identification probe (8) for identifying a check point on a PCBA board (01), the frame (1) being provided with a lifting mechanism (7) for driving the printing platform (6) to rise and fall, the lifting mechanism (7) comprising a lifting mechanism (7) slidingly provided in a horizontal direction on the printing platform (6) and a lifting mechanism (8 ... A driving block (71) on the inner bottom plate of a frame (1), a top support member (72) slidably arranged on the top of the driving block (71), and a multi-stage cylinder (73) for driving the driving block (71) to slide; a plurality of guide pillars (61) vertically slidably penetrating the inner bottom plate of the frame (1) are arranged at the bottom of the printing platform (6); the top support member (72) is connected to the bottom of the printing platform (6); a conveying platform (711), a checking platform (712), and a tinning platform (713) are sequentially arranged on the driving block (71) along the sliding direction; and the conveying platform (711) and the checking platform (712), and the checking platform (712) and the tinning platform (713) are all connected by an inclined transition.

2. The automatic printing equipment for PCBA board processing according to claim 1, characterized in that The top support member (72) comprises a top support frame (721) fixedly arranged at the bottom of the printing platform (6) and a pressure roller (722) rotatably arranged at the bottom end of the top support frame (721); the length direction of the top support frame (721) is perpendicular to the sliding direction of the driving block (71), and the side wall of the pressure roller (722) is always arranged to contact with the top wall of the driving block (71).

3. The automatic printing equipment for PCBA board processing according to claim 2 is characterized in that The driving block (71) is provided with limiting plates (714) on the opposite side walls on both sides along its own sliding direction, and a limiting groove (7141) is provided on the limiting plate (714) along the moving path of the rotating shaft of the pressing roller (722), and the rotating shaft end of the pressing roller (722) extending out of the side wall of the top support frame (721) is inserted into the limiting groove (7141) and slides with the limiting groove (7141).

4. The automatic printing equipment for PCBA board processing according to claim 1, characterized in that The printing platform (6) is provided with a plurality of guide rollers (9) which are distributed and rotated along the conveying direction of the conveying platform (2). A placement groove (62) is provided on the printing platform (6) corresponding to each guide roller (9). The guide roller (9) is rotatably arranged in the placement groove (62), and the side wall of the guide roller (9) extends from the placement groove (62) to the top wall of the printing platform (6). A synchronous wheel (91) is sleeved on the rotating shaft of the guide roller (9) extending out of the printing platform (6). A synchronous belt (911) is meshed with the plurality of synchronous wheels (91), and a rotating motor (912) is provided on the printing platform (6) to drive one of the guide rollers (9) to rotate.

5. The automatic printing equipment for PCBA board processing according to claim 1, characterized in that The top of the printing platform (6) is located on one side of the output direction of the PCBA board (01) and is provided with a baffle (63) that is lifted and lowered. When the baffle (63) is lifted, the height of the baffle (63) is lower than the thickness of the PCBA board (01).

6. The automatic printing equipment for PCBA board processing according to claim 1, characterized in that The solder paste dipping mechanism (5) comprises a solder paste storage box (51) and a coating component (52), and a U-shaped slide groove (31) is correspondingly opened on the opposite side walls of the printing table (3), and a slider (311) is slidably arranged in the slide groove (31), and the slider (311) is connected to the end wall of the solder paste storage box (51), and a driving member (11) is arranged on the frame (1) to drive the solder paste storage box (51) to move along the groove of the slide groove (31), and the coating component (52) is provided with a driving member (11) on the frame (1) to drive the solder paste storage box (51) to move along the groove of the slide groove (31). The covering component (52) includes a flexible scraper (521) and a tin coating roller (522) arranged in parallel, wherein the flexible scraper (521) and the tin coating roller (522) are distributed along the width direction of the solder paste storage box (51), and when the slider (311) is located in the lower groove section of the slide groove (31), the flexible scraper (521) and the tin coating roller (522) both contact the screen printing steel mesh (4), and the flexible scraper (521) is located behind the tin coating roller (522) in the rolling direction.

7. The automatic printing equipment for PCBA board processing according to claim 6, characterized in that The bottom of the solder paste storage box (51) is V-shaped along its width direction, and the bottom end of the V-shape is provided with a tin outlet (511) along its length direction. The tin coating roller (522) is rotatably connected to the tin outlet (511). Adjustment grooves (512) are vertically provided on two opposite inner side walls along the length direction of the solder paste storage box (51). A limit block (5121) is slidably provided in the adjustment groove (512). The limit block (5121) is sleeved on the end of the rotating shaft of the tin coating roller (522), and each adjustment groove (512) is provided with a spring (5122) abutting between the inner top wall of the adjustment groove (512) and the limit block (5121).

8. The printing process of automatic printing equipment for PCBA board processing is characterized by , including the following steps, S1, placing the PCBA board (01) to be printed with solder paste on the conveying table (2), and conveying it to the printing table (6) along the conveying table (2) for precise positioning; S2, the multi-stage cylinder (73) pushes the pressure roller (722) under the printing platform (6) to the verification platform (712), and the identification probe (8) identifies the verification point of the PCBA board (01); S3. After confirming that the recognition is correct, the multi-stage cylinder (73) further pushes the CBA board to fit the screen printing steel mesh (4) to print solder paste; S4, the tin coating roller (522) coats the solder paste on the screen printing steel mesh (4), and the flexible scraper (521) scrapes off the excess solder paste on the screen printing steel mesh (4), and prints the solder paste from the mesh of the screen printing steel mesh (4) onto the PCBA board (01); S5. The multi-stage cylinder (73) drives the printing table (6) to descend to be flush with the conveying table (2), the guide roller (9) rotates and outputs the PCBA board (01), and the PCBA board (01) is conveyed away from the frame (1) by the downstream conveying table (2).

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