PCBA full-automatic high-precision screen printing machine device

Abstract

The utility model relates to the related field of screen printing machines, in particular to a PCBA full-automatic high-precision screen printing machine device which comprises a workbench, a screen printing machine body, a U-shaped positioning plate, an air conveying pipe, a branch pipe, a miniature electromagnetic valve, a fixing cylinder, a piston rod, a pressing block head, a pressure sensor and the like. According to the utility model, the pressing blocks and the pressure sensors are arranged, and the plurality of pressing blocks are attached to different positions outside the PCB, so that even if the side surface of the PCB is a curved surface, the plurality of pressing blocks can clamp and fix the PCB, thereby realizing accurate positioning of the PCB, facilitating the subsequent accurate coating of solder paste on the PCB by a screen printing machine, and improving the production efficiency. The pressure sensor detects the pressure applied to the PCB by the pressing block, and when the applied pressure reaches a preset value, the miniature electromagnetic valve is closed, and the pressing block stops moving, so that the accurate pressure applied to the PCB by the pressing block is fully automatically adjusted, the PCB is prevented from being deformed due to excessive pressure while the stable pressure is applied to the PCB, and the positioning effect on the PCB is improved.

Description

Technical Field

[0001] The utility model relates to the field of screen printing machines, in particular to a PCBA fully automatic high-precision screen printing machine device. Background Art

[0002] PCBA screen printer, also often called PCB printer or solder paste printer, is a key equipment in the electronic assembly production line. Its main function is to accurately print solder paste or patch adhesive on the PCB board to prepare for the subsequent SMT component placement. This process is crucial to ensure the welding quality and assembly efficiency of electronic products.

[0003] The existing publication number is: CN212021967U, which provides a high-precision screen printing table PCB positioning system. The PCB board can be positioned in the horizontal direction through the first U-shaped positioning plate and the second U-shaped positioning plate, and the PCB can be positioned in the vertical direction through the pressure plate, which is convenient for accurate positioning of the PCB board.

[0004] The U-shaped positioning plate of the existing patent is fixed in size and shape, while the side surfaces of some PCB boards are curved, which may easily cause the U-shaped positioning plate to not fit smoothly on the side surfaces of the PCB board, thereby reducing the positioning effect of the PCB board and easily affecting the accuracy of the subsequent solder paste coating work of the screen printer. In addition, the clamping force of the PCB board is manually judged, and it is difficult to accurately control the clamping force of the PCB board. If the holding force on the PCB board is too large, it may easily cause the PCB board to deform or even be damaged. If the holding force on the PCB board is too small, it may easily cause the PCB board to be clamped unstably, thereby reducing the positioning effect of the PCB board. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a PCBA fully automatic high-precision screen printing machine device to solve the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a PCBA fully automatic high-precision screen printer device, comprising a workbench and a screen printer body installed on the top of the workbench, wherein two mutually symmetrical U-shaped positioning plates are movably installed on the top of the workbench;

[0007] The U-shaped positioning plate is hollow inside to form a hollow cavity, and a driving component is provided at the bottom of the U-shaped positioning plate, and the driving component is used to provide a driving force for the two U-shaped positioning plates to move relative to each other along the horizontal direction of the workbench;

[0008] A plurality of fixing cylinders are embedded in the inner side of the U-shaped positioning plate;

[0009] An air delivery pipe is movably inserted into the hollow cavity, and a plurality of branch pipes are arranged on the air delivery pipe. The plurality of branch pipes are respectively inserted into a plurality of fixed cylinders in a one-to-one correspondence, and a micro electromagnetic valve is installed on each branch pipe;

[0010] A piston rod is slidably installed in the fixed cylinder and movably penetrates the fixed cylinder. A groove is provided at the protruding end of the piston rod. A pressure block is movably installed in the groove. A pressure sensor is fixed in the groove. The detection end of the pressure sensor is connected to the pressure block.

[0011] Preferably, the driving assembly includes a motor installed in the workbench, two sliding frames movably installed in the workbench and symmetrical to each other, and a bidirectional screw connected to the motor output shaft, the bidirectional screw is rotatably connected to the inner side of the workbench, and the bidirectional screw is threadedly connected to the sliding frame, and the two sliding frames are connected one by one with two U-shaped positioning plates after passing through the inner top of the workbench.

[0012] Preferably, the piston rod is connected to the inner end surface of the fixed cylinder via a spring.

[0013] Preferably, a rubber head is installed at one end of the pressure block away from the pressure sensor.

[0014] Preferably, a sealing ring is embedded in the fixing tube, and the inner ring of the sealing ring is tightly attached to the outer end surface of the branch pipe.

[0015] Preferably, the sealing ring is made of silicone.

[0016] Preferably, a strip hole is provided on the inner top of the workbench, and the strip hole is movably connected to the sliding frame.

[0017] Beneficial effects of the utility model:

[0018] The utility model is provided with a pressing block and a pressure sensor, and with a plurality of fixing cylinders and piston rods. Different piston rods drive the pressing blocks to move outwards and fit at different positions outside the PCB board. Even if the side surface of the PCB board is a curved surface, the plurality of pressing blocks can clamp and fix the PCB board, thereby improving the positioning effect of the PCB board, facilitating the subsequent screen printing machine to accurately apply solder paste to the PCB board. When the pressing block applies pressure to the PCB board, the pressure sensor detects the size of the applied pressure. When the applied pressure reaches a preset value, the micro-solenoid valve is closed and the pressing block stops moving, so as to realize fully automatic adjustment of the pressing block to apply precise pressure to the PCB board. While applying stable pressure to the PCB board, the PCB board is also prevented from being deformed due to excessive pressure, thereby improving the positioning effect of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2This is a schematic diagram of the top view of the connection structure of the U-shaped positioning plate of the utility model;

[0021] Figure 3 It is a schematic diagram of the top-view cross-sectional connection structure of the U-shaped positioning plate of the utility model.

[0022] Among them: workbench-1, screen printing machine body-2, U-shaped positioning plate-3, motor-4, bidirectional screw-5, sliding frame-6, strip hole-7, hollow cavity-8, air supply pipe-9, branch pipe-10, micro solenoid valve-11, fixed cylinder-12, piston rod-13, spring-14, groove-15, pressure block-16, rubber head-17, pressure sensor-18, sealing ring-19. DETAILED DESCRIPTION

[0023] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0024] like Figure 1 As shown, the utility model provides a PCBA fully automatic high-precision screen printer device, comprising a workbench 1 and a screen printer body 2 installed on the top of the workbench 1;

[0025] like Figures 1 to 3 As shown, in this embodiment, two mutually symmetrical U-shaped positioning plates 3 are movably installed on the top of the workbench 1, and the U-shaped positioning plates 3 are used to provide positioning for the PCB board to reduce the deviation of the PCB board during the process of applying solder paste;

[0026] The U-shaped positioning plate 3 is hollow inside to form a hollow cavity 8, and a driving component is provided at the bottom of the U-shaped positioning plate 3, and the driving component is used to provide a driving force for the two U-shaped positioning plates 3 to move relative to each other in the horizontal direction of the workbench 1;

[0027] A plurality of equally spaced fixed cylinders 12 are fixedly embedded in the inner side of the U-shaped positioning plate 3;

[0028] A gas delivery pipe 9 is movably passed through the hollow cavity 8, and a plurality of equally spaced branch pipes 10 are arranged on the gas delivery pipe 9. The plurality of branch pipes 10 are respectively inserted into a plurality of fixed cylinders 12 in a one-to-one correspondence. Gas is input into the fixed cylinders 12 through the branch pipes 10 to realize the horizontal movement of the piston rod 13 along the inner wall of the fixed cylinder 12, and a micro solenoid valve 11 is installed on each branch pipe 10 to control the on and off of the gas in the branch pipe 10;

[0029] A piston rod 13 is slidably installed in the fixed cylinder 12, and the piston rod 13 horizontally moves through the fixed cylinder 12. A groove 15 is provided at the protruding end of the piston rod 13, and a pressure block 16 is movably installed in the groove 15. The pressure block 16 is used to clamp and fix the PCB board, and a pressure sensor 18 is fixed in the groove 15. The detection end of the pressure sensor 18 is connected to the pressure block 16, which is used to detect the pressure applied by the pressure block 16 to the PCB board;

[0030] In this embodiment, the driving assembly includes a motor 4 installed in the workbench 1, two sliding frames 6 movably installed in the workbench 1 and symmetrical to each other, and a bidirectional screw rod 5 connected to the output shaft of the motor 4. The bidirectional screw rod 5 is rotatably connected to the inner side of the workbench 1, and the bidirectional screw rod 5 is threadedly connected to the sliding frame 6, so that the sliding frame 6 can be driven to move horizontally in the workbench 1 by the bidirectional screw rod 5. After passing through the top of the inner side of the workbench 1, the two sliding frames 6 are connected to the two U-shaped positioning plates 3 one by one, so as to drive the U-shaped positioning frames 3 to move horizontally synchronously;

[0031] In this embodiment, the piston rod 13 is connected to the inner end surface of the fixed cylinder 12 through the spring 14, so that the piston rod 13 is reset by the elastic force of the spring 14;

[0032] In this embodiment, a rubber head 17 is installed at one end of the pressing block 16 away from the pressure sensor 18 to prevent the pressing block 16 from wearing the side surface of the PCB board, which is beneficial to provide protection for the PCB board;

[0033] In this embodiment, a sealing ring 19 is embedded in the fixed tube 12, and the inner ring of the sealing ring 19 is in close contact with the outer end surface of the branch pipe 10, thereby improving the sealing performance of the branch pipe 10 connected to the fixed tube 12 and reducing gas leakage;

[0034] In this embodiment, the sealing ring 19 is made of silicone material, which has good elasticity and better sealing effect;

[0035] In this embodiment, a strip hole 7 is provided on the inner top of the workbench 1, and the strip hole 7 is movably connected to the sliding frame 6, which is conducive to the smooth horizontal movement of the sliding frame 6;

[0036] The electrical device in this embodiment is connected to an external controller, which is a prior art;

[0037] Specifically, when in use, the PCB board to be coated with solder paste is placed on the workbench, and the PCB board is placed between two U-shaped positioning plates 3, and the end of the air pipe 9 is connected to the external air pressure equipment;

[0038] Then, the motor 4 is controlled to drive the bidirectional screw rod 5 to rotate, the bidirectional screw rod 5 drives the two sliding frames 6 to move toward each other, the two sliding frames 6 respectively drive the two U-shaped positioning plates 3 to move toward each other, the U-shaped positioning plates 3 drive the fixed cylinder 12, the piston rod 13, and the pressure block 16 to move inward, and the pressure block 16 drives the rubber head 17 to move inward to the side surface close to the PCB board, and the motor 4 is controlled to stop working;

[0039] Then, the external air pressure device is controlled to input gas into the gas delivery pipe 9, and the gas flows into the fixed cylinder 12 through the branch pipe 10 to push the piston rod 13 to move, and the piston rod 13 drives the pressure block 16 and the rubber head 17 to move horizontally to clamp and fix the PCB board, and the pressure applied by the rubber head 17 to the PCB board is detected by the pressure sensor 18. When the applied pressure reaches a preset value, the corresponding micro-solenoid valve 11 is closed, and the pressure block 16 and the rubber head 17 stop moving. If the side surface of the PCB board is a curved surface, the gas is continuously input into the fixed cylinder 12 corresponding to the rubber head 17 that does not press the PCB board, until the pressure applied by the rubber head 17 to the PCB board reaches a preset value, so as to realize the fully automatic positioning of the PCB board, and facilitate the subsequent application of solder paste to the PCB board with higher precision after the PCB is positioned;

[0040] After the PCB board is positioned, the screen printer body 2 can be controlled to make the template pre-installed on the screen printer body 2 close to the PCB board. The template is pre-opened with holes corresponding to the pads. The screen printer body 2 uses a scraper or pump system to evenly apply the solder paste on the template, and then the scraper moves to transfer the solder paste to the pads of the PCB through the holes on the template. After the coating is completed, the motor 4 is controlled to drive the pressing block 16 and the rubber head 17 to move outward and away from the PCB board, and the PCB board is removed from the workbench 1 to complete the solder paste printing work on the PCB board.

[0041] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PCBA fully automatic high-precision screen printer device, comprising a workbench and a screen printer body installed on the top of the workbench; It is characterized in that Two mutually symmetrical U-shaped positioning plates are movably installed on the top of the workbench; The U-shaped positioning plate is hollow inside to form a hollow cavity, and a driving component is provided at the bottom of the U-shaped positioning plate, and the driving component is used to provide a driving force for the two U-shaped positioning plates to move relative to each other along the horizontal direction of the workbench; A plurality of fixing cylinders are embedded in the inner side of the U-shaped positioning plate; An air delivery pipe is movably inserted into the hollow cavity, and a plurality of branch pipes are arranged on the air delivery pipe. The plurality of branch pipes are respectively inserted into a plurality of fixed cylinders in a one-to-one correspondence, and a micro electromagnetic valve is installed on each branch pipe; A piston rod is slidably installed in the fixed cylinder and movably penetrates the fixed cylinder. A groove is provided at the protruding end of the piston rod. A pressure block is movably installed in the groove. A pressure sensor is fixed in the groove. The detection end of the pressure sensor is connected to the pressure block.

2. According to claim 1, a PCBA fully automatic high-precision screen printer device is characterized in that: The driving assembly includes a motor installed in the workbench, two sliding frames movably installed in the workbench and symmetrical to each other, and a bidirectional screw connected to the motor output shaft. The bidirectional screw is rotatably connected to the inner side of the workbench, and the bidirectional screw is threadedly connected to the sliding frame. After passing through the top of the inner side of the workbench, the two sliding frames are connected to two U-shaped positioning plates one by one.

3. According to claim 1, a PCBA fully automatic high-precision screen printer device is characterized in that: The piston rod is connected to the inner end surface of the fixed cylinder through a spring.

4. According to claim 1, a PCBA fully automatic high-precision screen printer device is characterized in that: A rubber head is installed at one end of the pressure block away from the pressure sensor.

5. According to claim 1, a PCBA fully automatic high-precision screen printer device is characterized in that: A sealing ring is embedded in the fixing cylinder, and the inner ring of the sealing ring is tightly attached to the outer end surface of the branch pipe.

6. A PCBA fully automatic high-precision screen printer device according to claim 5, characterized in that: The sealing ring is made of silicone.

7. According to claim 2, a PCBA fully automatic high-precision screen printer device is characterized in that: A strip hole is provided on the inner top of the workbench, and the strip hole is movably connected with the sliding frame.

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