Solder paste screen printing machine with path limiting function for circuit board solder paste printing

Abstract

The utility model relates to the technical field of screen printing machines, and discloses a solder paste screen printing machine with a path limiting function for circuit board solder paste printing, which comprises a printing table, a supporting plate fixedly connected to the top surface of the printing table, a top plate fixedly connected to the outer surface of the supporting plate, a first air cylinder mounted on the top surface of the top plate, and a lug connected to the output end of the first air cylinder. One end of each lug block is fixedly connected with a back plate, two ends of the back plate are fixedly connected with side plates, the outer surfaces of the side plates are rotatably connected with lead screws, travel switches and guide rails are mounted on the outer surfaces of the side plates, and the outer surfaces of the guide rails are slidably connected with sliding blocks. According to the utility model, the printing stock to be printed is placed on the printing table, and when the first air cylinder is started to drive the lug block to move downwards, the lug block drives the back plate, the back plate drives the side plate, the side plate drives the inclined plate, the inclined plate drives the connecting plate, the connecting plate drives the clamp, and the clamp drives the screen printing plate to move downwards, so that the screen printing plate can be in contact with the printing stock to prevent the printing stock from shifting; therefore, subsequent printing of the printing stock is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of screen printers, in particular to a solder paste screen printer with a path limiting function for printing solder paste on a circuit board. Background Art

[0002] Circuit board solder paste is a welding material used in surface mount technology (SMT), which is mainly a paste mixture of solder powder, flux and other additives. The solder paste screen printer is a key equipment in the production of surface mount technology (SMT), which is responsible for accurately printing the solder paste onto the pads on the PCB board.

[0003] According to the search, Chinese patent literature, announcement number: CN209649722U, discloses a screen printing machine with a clamping and adjustment function. A guide rail is provided on the upper surface of the workbench, and a clamp is slidably connected to the guide rail. A linear motor is provided between the clamp and the guide rail. In this way, the operator only needs to load and unload materials at the end of the guide rail away from the screen printing mechanism, and there is no need to be directly below the screen printing mechanism. The light is better, it is easier to align and clamp, and it is safer. After the substrate is clamped and fixed by the clamp, the linear motor can be started to transport it to the bottom of the screen printing mechanism to complete the leak printing.

[0004] However, the above screen printer uses a clamp to clamp the substrate during actual use, so that after printing a substrate, it needs to be manually removed from the clamp, and then the clamp is used again to clamp the new substrate, which is very cumbersome and troublesome; and the screen printer has no limited printing path, so the position of the substrate needs to be adjusted every time it is used. Therefore, we need to make improvements. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the utility model provides a solder paste screen printer for printing solder paste on circuit boards with a path limiting function. It has the advantages of being able to automatically press the substrate to prevent deviation during the screen printing process, and the printing path can be limited and ink return is easy, thereby solving the above-mentioned technical problems.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a solder paste screen printer for printing solder paste on circuit boards with a path limiting function, comprising a printing table, the top surface of the printing table is fixedly connected to a support plate, the outer surface of the support plate is fixedly connected to a top plate, a No. 1 cylinder is installed on the top surface of the top plate, the output end of the No. 1 cylinder is connected to an ear block, one end of the ear block is fixedly connected to a back plate, both ends of the back plate are fixedly connected to side plates, the outer surface of the side plate is rotatably connected to a lead screw, and a travel switch and a guide rail are installed on the outer surface of the side plate, the outer surface of the guide rail is slidably connected to a slider, the front of the slider is connected to a mounting plate, a No. 2 cylinder is installed on the top surface of the mounting plate, the output end of the No. 2 cylinder is connected to a scraper, a guide rod is installed on the top of the scraper, one side of the side plate is fixedly connected to an inclined plate, one end of the inclined plate is fixedly connected to a connecting plate, one end of the connecting plate is fixedly connected to a clamp, and a screen printing plate is installed in the clamp.

[0009] Preferably, two groups of guide blocks are installed on the back side of the back plate, and a polished rod is slidably connected inside the guide block, and the top end of the polished rod is connected to the top plate.

[0010] Through the above technical scheme, by placing the substrate to be printed on the printing table, when the No. 1 cylinder is started to drive the ear block to move downward, the ear block drives the back plate, the back plate drives the side plate, the side plate drives the inclined plate, the inclined plate drives the connecting plate, the connecting plate drives the clamp, and the clamp drives the silk screen plate to move downward, so that the silk screen plate can contact the substrate to facilitate subsequent printing on the substrate.

[0011] Preferably, the screw rod is threadedly connected to the slider, and one end of the screw rod is connected to a servo motor, and the servo motor is installed on the outer surface of one of the side panels.

[0012] Through the above technical scheme, by starting the servo motor to drive the screw to rotate, the screw drives the slider to slide on the guide rail, the slider drives the mounting plate, the mounting plate drives the No. 2 cylinder and the scraper to move horizontally, and the solder paste is placed on the upper surface of the silk screen plate. By starting one of the No. 2 cylinders, the scraper can be driven to move downward and contact the silk screen plate, and then when the silk screen plate moves horizontally, the solder paste can be scraped to achieve leak printing.

[0013] Preferably, the servo motor is connected to a PLC controller via a wire, and the PLC controller is connected to a travel switch via a wire.

[0014] Through the above technical solution, the slider is driven to move by the screw rod. When the slider contacts the travel switch, the travel switch sends a signal to the PLC controller, and the PLC controller controls the servo motor to reverse and rotate, thereby enabling the slider to return.

[0015] Preferably, the No. 2 cylinder and the scraper are each provided with two groups, and the guide rod is slidably connected to the mounting plate.

[0016] Through the above technical scheme, when ink return is required, the first set of scrapers and No. 2 cylinder are reset, and then another No. 2 cylinder is started to drive another scraper to move downward and contact the screen printing plate. Subsequently, the servo motor drives the lead screw to drive the slider to return and drive the scraper to scrape the solder paste back. Automatic screen printing is achieved in this reciprocating manner. When the No. 2 cylinder drives the scraper, the scraper drives the two guide rods to slide in the mounting plate, and the two guide rods can guide the mounting plate.

[0017] Preferably, the top surface of the clamp is threadedly connected to two sets of bolts with knobs.

[0018] Through the above technical solution, the silk screen plate can be taken out from between the two clamps by rotating the bolt counterclockwise, so that it is convenient to replace a new silk screen plate.

[0019] Compared with the prior art, the utility model provides a solder paste screen printer for printing solder paste on a circuit board with a path limiting function, which has the following beneficial effects:

[0020] 1. The utility model places the substrate to be printed on the printing table. When the No. 1 cylinder is started to drive the ear block to move downward, the ear block drives the back plate, the back plate drives the side plate, the side plate drives the inclined plate, the inclined plate drives the connecting plate, the connecting plate drives the clamp, and the clamp drives the screen printing plate to move downward, so that the screen printing plate can contact the substrate to prevent it from shifting, so as to facilitate the subsequent printing of the substrate.

[0021] 2. The utility model installs two sets of No. 2 cylinders and scrapers. When ink needs to be returned, the scraper is reset, and then another No. 2 cylinder is started to drive another scraper to move downward and contact the screen printing plate. Then the servo motor drives the lead screw to drive the slider to return, which can drive the scraper to scrape the solder paste back, and automatic screen printing is realized in this reciprocating manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a side schematic diagram of the structure of the utility model;

[0024] Figure 3 It is a partial three-dimensional schematic diagram of the structure of the utility model.

[0025] Among them: 1. Printing table; 2. Support plate; 3. Top plate; 4. No. 1 cylinder; 5. Ear block; 6. Back plate; 7. Side plate; 8. Screw rod; 9. Travel switch; 10. Guide rail; 11. Slider; 12. Mounting plate; 13. No. 2 cylinder; 14. Scraper; 15. Guide rod; 16. Inclined plate; 17. Connecting plate; 18. Clamp; 19. Silk screen plate; 20. Guide block; 21. Polish rod; 22. Servo motor; 23. Bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-Figure 3 A solder paste screen printer for printing solder paste on a circuit board with a path limiting function comprises a printing table 1, the top surface of the printing table 1 is fixedly connected to a support plate 2, the outer surface of the support plate 2 is fixedly connected to a top plate 3, a No. 1 cylinder 4 is installed on the top surface of the top plate 3, the output end of the No. 1 cylinder 4 is connected to an ear block 5, one end of the ear block 5 is fixedly connected to a back plate 6, both ends of the back plate 6 are fixedly connected to a side plate 7, the outer surface of the side plate 7 is rotatably connected to a screw rod 8, and a travel switch 9 and a guide rail 10 are installed on the outer surface of the side plate 7, the outer surface of the guide rail 10 is slidably connected to a slider 11, the front of the slider 11 is connected to a mounting plate 12, a No. 2 cylinder 13 is installed on the top surface of the mounting plate 12, the output end of the No. 2 cylinder 13 is connected to a scraper 14, a guide rod 15 is installed on the top of the scraper 14, one side of the side plate 7 is fixedly connected to an inclined plate 16, one end of the inclined plate 16 is fixedly connected to a connecting plate 17, one end of the connecting plate 17 is fixedly connected to a clamp 18, and a screen printing plate 19 is installed in the clamp 18.

[0028] Specifically, two sets of guide blocks 20 are installed on the back of the back plate 6, and the guide blocks 20 are slidably connected to the polished rods 21, and the top ends of the polished rods 21 are connected to the top plate 3. The advantage is that by placing the substrate to be printed on the printing table 1, when the No. 1 cylinder 4 is started to drive the ear block 5 to move downward, the ear block 5 drives the back plate 6, the back plate 6 drives the side plate 7, the side plate 7 drives the inclined plate 16, the inclined plate 16 drives the connecting plate 17, the connecting plate 17 drives the clamp 18, and the clamp 18 drives the screen printing plate 19 to move downward, so that the screen printing plate 19 can contact the substrate, so as to facilitate the subsequent printing of the substrate.

[0029] Specifically, the screw rod 8 is threadedly connected to the slider 11, and one end of the screw rod 8 is connected to the servo motor 22, which is installed on the outer surface of one of the side plates 7. The advantage is that by starting the servo motor 22 to drive the screw rod 8 to rotate, the screw rod 8 drives the slider 11 to slide on the guide rail 10, the slider 11 drives the mounting plate 12, and the mounting plate 12 drives the No. 2 cylinder 13 and the scraper 14 to move horizontally, placing the solder paste on the upper surface of the screen printing plate 19, and by starting one of the No. 2 cylinders 13, the scraper 14 can be driven to move downward to contact the screen printing plate 19, and then when the screen printing plate 19 moves horizontally, the solder paste can be scraped to achieve leakage printing.

[0030] Specifically, the servo motor 22 is connected to the PLC controller through a wire, and the PLC controller is connected to the travel switch 9 through a wire. The advantage is that the slider 11 is driven to move by the screw rod 8, and when the slider 11 contacts the travel switch 9, the travel switch 9 sends a signal to the PLC controller, and the PLC controller controls the servo motor 22 to reverse and rotate, thereby enabling the slider 11 to return.

[0031] Specifically, two groups of No. 2 cylinders 13 and scrapers 14 are provided, and guide rods 15 are slidably connected to the mounting plate 12. The advantage is that when ink needs to be returned, the first group of scrapers 14 and No. 2 cylinders 13 are reset, and then another No. 2 cylinder 13 is started to drive another scraper 14 to move downward and contact the screen printing plate 19, and then the servo motor 22 drives the lead screw 8 to drive the slider 11 to return, which can drive the scraper 14 to scrape the solder paste back, and automatic screen printing is achieved in this reciprocating manner. When the No. 2 cylinder 13 drives the scraper 14, the scraper 14 drives the two guide rods 15 to slide in the mounting plate 12, and the two guide rods 15 can guide the mounting plate 12.

[0032] Specifically, the top surface of the clamp 18 is threadedly connected to two sets of bolts 23 with knobs. The advantage is that the screen printing plate 19 can be taken out from between the two clamps 18 by rotating the bolts 23 counterclockwise, so that a new screen printing plate 19 can be replaced conveniently.

[0033] When in use, the substrate is placed on the printing table 1, and when the ear block 5 is driven downward by starting the No. 1 cylinder 4, the ear block 5 drives the back plate 6, the back plate 6 drives the side plate 7, the side plate 7 drives the inclined plate 16, the inclined plate 16 drives the connecting plate 17, the connecting plate 17 drives the clamp 18, and the clamp 18 drives the screen printing plate 19 to move downward, so that the screen printing plate 19 can contact the substrate, and then one of the No. 2 cylinders 13 can be started to drive the scraper 14 to move downward and contact the screen printing plate 19, and solder paste is placed on the screen printing plate 19, and then the servo motor 22 is started to drive the screw rod 8 to rotate, and the screw rod 8 drives the slider 1 1 slides on the guide rail 10, the slider 11 drives the mounting plate 12, the mounting plate 12 drives the No. 2 cylinder 13 and the scraper 14 to move horizontally, the scraper 14 scrapes the solder paste to form a missing print, when the slider 11 contacts the travel switch 9, the travel switch 9 sends a signal to the PLC controller, the PLC controller controls the servo motor 22 to reverse the rotation, and then the slider 11 can return, before the slider 11 returns, the PLC controller controls another group of No. 2 cylinders 13 to drive the scraper 14 connected thereto to contact the screen printing plate 19, and the previous scraper 14 is reset, so that the solder paste can be scraped back.

[0034] Although the 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 solder paste screen printer for printing solder paste on a circuit board with a path limiting function, comprising a printing table (1), characterized in that: The top surface of the printing table (1) is fixedly connected to the support plate (2), the outer surface of the support plate (2) is fixedly connected to the top plate (3), the top surface of the top plate (3) is installed with a No. 1 cylinder (4), the output end of the No. 1 cylinder (4) is connected to an ear block (5), one end of the ear block (5) is fixedly connected to a back plate (6), both ends of the back plate (6) are fixedly connected to a side plate (7), the outer surface of the side plate (7) is rotatably connected to a lead screw (8), and the outer surface of the side plate (7) is installed with a travel switch (9) and a guide rail (10), the outer surface of the guide rail (10) The surface is slidably connected to a slider (11), the front of the slider (11) is connected to a mounting plate (12), a No. 2 cylinder (13) is installed on the top surface of the mounting plate (12), the output end of the No. 2 cylinder (13) is connected to a scraper (14), a guide rod (15) is installed on the top of the scraper (14), one side of the side plate (7) is fixedly connected to an inclined plate (16), one end of the inclined plate (16) is fixedly connected to a connecting plate (17), one end of the connecting plate (17) is fixedly connected to a clamp (18), and a screen printing plate (19) is installed in the clamp (18).

2. The solder paste screen printer for printing solder paste on a circuit board with a path limiting function according to claim 1, characterized in that: Two groups of guide blocks (20) are installed on the back side of the back plate (6), a polished rod (21) is slidably connected inside the guide block (20), and the top end of the polished rod (21) is connected to the top plate (3).

3. The solder paste screen printer for printing solder paste on a circuit board with a path limiting function according to claim 1, characterized in that: The screw rod (8) is threadedly connected to the slider (11), and one end of the screw rod (8) is connected to a servo motor (22), and the servo motor (22) is mounted on the outer surface of one of the side plates (7).

4. The solder paste screen printer for printing solder paste on a circuit board with a path limiting function according to claim 3, characterized in that: The servo motor (22) is connected to the PLC controller via a wire, and the PLC controller is connected to the travel switch (9) via a wire.

5. The solder paste screen printer for printing solder paste on a circuit board with a path limiting function according to claim 1, characterized in that: The second cylinder (13) and the scraper (14) are each provided with two groups, and the guide rod (15) is slidably connected to the mounting plate (12).

6. The solder paste screen printer for printing solder paste on a circuit board with a path limiting function according to claim 1, characterized in that: The top surface of the clamp (18) is threadedly connected to two groups of bolts (23) with knobs.

Images