A high-precision positioning mechanism for a tin paste printing machine

Abstract

The application discloses a high-precision positioning mechanism for a tin paste printing machine and belongs to the related technical field of tin paste printing, which comprises an operation table, a positioning frame and a sliding base, the sliding base is movably arranged on the upper end outer surface of the operation table, the positioning frame is arranged above the sliding base and is fixedly connected between the positioning frame and the operation table, the inner side of the sliding base is fixedly provided with a cross slide, the upper end outer surface of the cross slide is movably provided with four groups of movable clamping blocks for positioning PCB boards, the inner side of the positioning frame is movably provided with two groups of movable clamping strips for positioning printing plates, and the outer surface of one side of the movable clamping strip is movably provided with two groups of movable clamping heads; the movable adjusting structure and the positioning adjusting structure are combined, the structure is high in integration, the redundant components of the original two sets of independent mechanisms are eliminated, the manufacturing cost and the equipment volume are reduced, linkage collaborative work is realized, real-time synchronous deviation correction can be realized based on visual feedback, and action connection delay is eliminated.

Description

Technical Field

[0001] This invention belongs to the technical field of solder paste printing, specifically a high-precision positioning mechanism for solder paste printing machines. Background Technology

[0002] The high-precision positioning mechanism of the solder paste printer is mainly used to ensure the precise alignment of the printed circuit board and the PCB. Its core function is to automatically detect and calculate the positional deviation through the vision system, and then the motion platform performs real-time compensation and correction. At the same time, it works with the clamping system to firmly lock the PCB to prevent displacement during the printing process, thereby ensuring that the solder paste can be accurately and consistently applied to the designated pad positions, ultimately achieving high-reliability printing quality.

[0003] Patent document CN219505620U discloses a high-precision positioning device for a fully automatic solder paste printing machine, relating to the field of positioning device technology. This high-precision positioning device for a fully automatic solder paste printing machine includes an operating table. The operating table is rectangular in shape and has several circular holes on its top for easy insertion of a fixing plate. The fixing plate has slots for placing circuit boards. One side of the fixing plate has an opening, and two L-shaped clamping strips are provided on one side of the opening. Each L-shaped clamping strip is clamped to one side of the circuit board. The L-shaped clamping strips have slots for inserting rods into the circular holes. A guide post is fixed to the bottom of the operating table by bolts.

[0004] Existing high-precision positioning devices have certain shortcomings in use. In the existing positioning mechanisms, the fixed adjustment and the moving adjustment are two completely independent subsystems, each equipped with an independent drive source, transmission components and control system. This results in redundant overall structure, high cost and large space occupation. The two operate in stages in sequence, lacking real-time coordination and dynamic coupling capabilities. There is a response delay in the action connection. When the PCB material deviation is large, the moving adjustment needs to compensate for the residual error left by the previous fixed adjustment, resulting in low positioning efficiency. Secondly, the traditional positioning mechanism can only complete the positioning of the PCB board. In the actual printing process, it is necessary to accurately align the PCB board and the printed circuit board. However, the positioning mechanism cannot make corresponding adjustments according to the specifications of the printed circuit board, which reduces its flexibility in use. Summary of the Invention

[0005] This invention provides a high-precision positioning mechanism for solder paste printing machines. It solves the problems of existing positioning mechanisms where fixed adjustment and moving adjustment are two completely independent subsystems, each equipped with its own drive source, transmission components, and control system. This results in redundant overall structure, high cost, and large space occupation. Furthermore, the two operations are performed sequentially in segments, lacking real-time coordination and dynamic coupling capabilities, and there is a response delay in the action connection. When the PCB incoming material has a large deviation, the moving adjustment needs to compensate for the residual error left by the preceding fixed adjustment, leading to low positioning efficiency. A high-precision positioning mechanism for a solder paste printing machine includes an operating table, a positioning frame, and a sliding base. The sliding base is movably installed at the middle of the upper outer surface of the operating table. The positioning frame is located above the sliding base and is fixedly connected to the operating table. A cross slide is fixedly installed on the inner side of the sliding base. Four sets of movable clamps for positioning PCB boards are movably installed on the upper outer surface of the cross slide. Two sets of movable clips for positioning the printed circuit board are movably installed on the inner side of the positioning frame. Two sets of movable clip heads are movably installed on one outer surface of the movable clips.

[0006] As a further technical solution of the present invention, a first lead screw for driving the movable clamping blocks is movably installed inside the cross slide. The four sets of movable clamping blocks are arranged symmetrically in a cross shape. During operation, the rotation of the first lead screw drives the movable clamping blocks to move. The surface of the first lead screw adopts a one-way thread structure, so that when the first lead screw rotates, it causes the two sets of movable clamping blocks to move independently, so that the two sets of movable clamping blocks are respectively locked on both sides of the PCB board. The arrangement of the four sets of movable clamping blocks completes the positioning operation of the four sides of the PCB board.

[0007] As a further technical solution of the present invention, the upper end of the cross slide is provided with a sliding groove for use with the moving clamping block, and a rack is fixedly installed at the middle position of the lower outer surface of the sliding base. During operation, the rack can be used to drive the sliding base, thereby moving the sliding base out from the lower part of the positioning frame, which facilitates the user to perform PCB board installation operations in the sliding base. After the PCB board is installed and positioned, the sliding base is moved back to the lower part of the positioning frame so that the PCB board and the printed circuit board are aligned vertically.

[0008] As a further technical solution of the present invention, a threaded slide is fixedly installed at the lower end of the movable clamping block, and a threaded groove is provided in the middle of the threaded slide. A driver is provided at the bottom of the rack, and the driver and the operating table are fixedly connected. During operation, the driver uses a motor to drive the gear to rotate. Through the meshing of the gear and the toothed structure at the bottom of the rack, the gear drives the rack to move when it rotates. The threaded slide and the first lead screw are threadedly connected, so that the first lead screw drives the threaded slide to move the elastic chuck when it rotates.

[0009] As a further technical solution of the present invention, an elastic clamping head is elastically installed on one side of the movable clamping block. The movable clamping block and the elastic clamping head are elastically connected by a spring. During operation, when the movable clamping block clamps and positions the PCB board, the elastic clamping head contacts the side of the PCB board. Through the elastic structure of the elastic clamping head, the four sides of the PCB board can be elastically clamped, avoiding bending of the movable clamping block when clamping and fixing the PCB board.

[0010] As a further technical solution of the present invention, vertical lead screws are movably installed at the middle positions of both ends of the positioning frame, and sliders are provided at both ends of the positioning frame on both sides of the vertical lead screws. During operation, the rotation of the vertical lead screws can drive the elastic chuck to move up and down. The vertical movement of the positioning frame can control the height of the printing plate, thereby adjusting the distance between the printing plate and the PCB board. When the printing press performs solder paste printing operation, the solder paste printing thickness of the printing press can be adjusted.

[0011] As a further technical solution of the present invention, the movable card strip and the two sets of movable card heads are movably connected by a second lead screw. The outer surface of one end of the threaded slide is an arc-shaped structure. During operation, the rotation of the second lead screw can drive the two sets of threaded slides to move, thereby adjusting the position of the threaded slide according to the width of the printing plate. When the movable card strip fixes the printing plate, it will lock the movable card heads at the four corners of the printing plate and limit them at four points.

[0012] As a further technical solution of the present invention, a stop bar is fixedly installed on one side of the outer surface of the movable card bar between the two sets of movable card heads, and docking sliders are fixedly installed on both ends of the outer surface of the movable card bar. During operation, the design of the stop bar structure can support the lower part of the printing plate when the two sets of movable card bars are used to fix the printing plate, so as to prevent the printing plate from falling down between the two sets of movable card bars.

[0013] As a further technical solution of the present invention, the inner side of the positioning frame is provided with a sliding groove for use with the docking slider. A fastening bolt is movably installed on one side of a set of docking sliders. During operation, the position of the two sets of moving clips in the positioning frame is moved by the movement of the docking slider in the sliding groove. The moving clips and the positioning frame are locked and fixed by rotating the fastening bolt using the threaded structure.

[0014] As a further technical solution of the present invention, a printing machine is movably installed above the operating table, and the operating tables are movably connected to each other through a movable back plate. A controller is provided at the front end of the operating table. During operation, the controller is used to control and adjust the use of the printing machine, the positioning frame and the moving card strip. The solder paste is printed onto the soldering position of the PCB board through the holes of the printing plate by the movement of the printing machine.

[0015] The beneficial effects of this invention are as follows: By using a cross slide and a movable clamping block, this invention combines the movement adjustment and positioning adjustment structures in the high-precision positioning mechanism used in this solder paste printer. The structure is highly integrated, eliminating redundant components of the original two independent mechanisms, reducing manufacturing costs and equipment size, and enabling coordinated operation. It can perform real-time synchronous correction based on visual feedback, eliminating action connection delays, significantly improving positioning efficiency, ensuring the stability of locking and compensation states, and significantly improving the consistency of repeatability positioning accuracy. The control logic is simpler and more unified, reducing system complexity and failure risk, and enhancing the reliability and ease of maintenance of the equipment. In daily operation, the first lead screw is driven by a motor to rotate, and the rotation of the first lead screw drives the moving clamps to move. The surface of the first lead screw adopts a one-way thread structure, so that when the first lead screw rotates, it causes the two sets of moving clamps to move independently, so that the two sets of moving clamps are respectively locked on both sides of the PCB board. The setting of four sets of moving clamps completes the positioning operation of the four sides of the PCB board. The displacement of the moving clamps can also be adjusted. This operation can limit and fix PCB boards of different sizes to prevent them from moving during solder paste printing. Secondly, the rack and pinion can drive the sliding base. This allows the sliding base to be moved out from the bottom of the positioning frame, making it easier for users to install the PCB board inside the sliding base. After the PCB board is installed and positioned, the sliding base is moved back to the bottom of the positioning frame to align the PCB board and the printed circuit board vertically. At the same time, the PCB board can be moved back and forth. Secondly, when the moving clamping block clamps and positions the PCB board, the elastic clips contact the sides of the PCB board. Through the elastic structure of the elastic clips, the four sides of the PCB board can be clamped elastically, preventing the moving clamping block from bending when clamping and fixing the PCB board. By setting a positioning frame, the use of the sliding base is optimized when the high-precision positioning mechanism of the solder paste printer is used, which can flexibly adapt to different specifications of PCB structures. During operation, the rotation of the second lead screw drives the movement of two sets of threaded slides, thereby adjusting the position of the threaded slides according to the width of the printed circuit board. When the moving clips are used to fix the printed circuit board, they lock the moving clips at the four corners of the board, providing four-point limiting. The second lead screw can be driven manually or by a motor. Utilizing the design of the stop bar structure, the lower part of the printed circuit board is supported when the two sets of moving clips are used to fix the board, preventing it from falling down between the two sets of moving clips. Furthermore, the movement of the connecting slider within the groove moves the position of the two sets of moving clips within the positioning frame. By rotating the fastening bolt, the moving clips and the positioning frame are locked and fixed using the threaded structure. Adjusting the position of the moving clips allows for lateral adjustment of the printed circuit board's installation position. Additionally, the rotation of the vertical lead screw drives the elastic clips to move up and down. The vertical movement of the positioning frame controls the height of the printed circuit board, thereby adjusting the distance between the printed circuit board and the PCB board. During solder paste printing, the solder paste printing thickness can be adjusted. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an overall structural diagram of the sliding base in this invention; Figure 3 This is an overall structural diagram of the movable clamping block in this invention; Figure 4 This is an overall structural diagram of the positioning frame in this invention; Figure 5 This is an overall structural diagram of the movable card strip in this invention.

[0018] In the diagram: 1. Operating table; 2. Printing machine; 3. Positioning frame; 4. Sliding base; 5. Moving clip; 6. PCB board; 7. Controller; 8. Rack; 9. Driver; 10. Cross slide; 11. Moving clamp; 12. First lead screw; 13. Elastic chuck; 14. Threaded slide; 15. Vertical lead screw; 16. Moving chuck; 17. Second lead screw; 18. Fastening bolt; 19. Connecting slider; 20. Moving back plate. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-5 As shown, a high-precision positioning mechanism for a solder paste printing machine includes an operating table 1, a positioning frame 3, and a sliding base 4. The sliding base 4 is movably installed at the middle of the upper outer surface of the operating table 1. The positioning frame 3 is located above the sliding base 4 and is fixedly connected to the operating table 1. A cross slide 10 is fixedly installed on the inner side of the sliding base 4. Four sets of movable clamping blocks 11 for positioning PCB boards 6 are movably installed on the upper outer surface of the cross slide 10. Two sets of movable clips 5 for positioning the printed circuit board are movably installed on the inner side of the positioning frame 3. Two sets of movable clip heads 16 are movably installed on one side of the outer surface of the movable clips 5.

[0021] The cross slide 10 has a first lead screw 12 installed inside to drive the movable clamping blocks 11. The four sets of movable clamping blocks 11 are arranged symmetrically in a cross shape. During operation, the rotation of the first lead screw 12 drives the movable clamping blocks 11 to move. The surface of the first lead screw 12 adopts a one-way thread structure, so that when the first lead screw 12 rotates, it causes the two sets of movable clamping blocks 11 to move independently, so that the two sets of movable clamping blocks 11 are respectively locked on both sides of the PCB board 6. The arrangement of the four sets of movable clamping blocks 11 completes the positioning operation of the four sides of the PCB board 6.

[0022] The upper end of the cross slide 10 is provided with a sliding groove for use with the moving clamp 11. A rack 8 is fixedly installed at the middle of the lower outer surface of the sliding base 4. During operation, the rack 8 can be used to drive the sliding base 4, thereby moving the sliding base 4 out from the lower part of the positioning frame 3, which makes it convenient for the user to install the PCB board 6 in the sliding base 4. After the PCB board 6 is installed and positioned, the sliding base 4 is moved back to the lower part of the positioning frame 3 so that the PCB board 6 and the printed circuit board are aligned vertically.

[0023] A threaded slide 14 is fixedly installed at the lower end of the movable clamping block 11. The threaded slide 14 has a threaded groove in the middle. A driver 9 is provided at the bottom of the rack 8. The driver 9 is fixedly connected to the operating table 1. During operation, the driver 9 uses a motor to drive the gear to rotate. Through the meshing of the gear and the tooth structure at the bottom of the rack 8, the gear drives the rack 8 to move when it rotates. The threaded slide 14 and the first lead screw 12 are threadedly connected, so that the first lead screw 12 drives the threaded slide 14 to move the elastic chuck 13 when it rotates.

[0024] One side of the movable clamping block 11 is elastically fitted with an elastic clamping head 13. The movable clamping block 11 and the elastic clamping head 13 are elastically connected by a spring. During operation, when the movable clamping block 11 clamps and positions the PCB board 6, the elastic clamping head 13 contacts the side of the PCB board 6. Through the elastic structure of the elastic clamping head 13, the four sides of the PCB board 6 can be elastically clamped, preventing the movable clamping block 11 from bending when clamping and fixing the PCB board 6.

[0025] Vertical lead screws 15 are movably mounted at the middle of both ends of the positioning frame 3. Slider blocks are provided on both sides of the vertical lead screws 15 at both ends of the positioning frame 3. During operation, the rotation of the vertical lead screws 15 can drive the elastic clamp 13 to move up and down. The vertical movement of the positioning frame 3 can control the height of the printing plate, thereby adjusting the distance between the printing plate and the PCB board 6. When the printing machine 2 performs solder paste printing operation, the solder paste printing thickness of the printing machine 2 can be adjusted.

[0026] The movable locking strip 5 and the two sets of movable locking heads 16 are movably connected by the second lead screw 17. The outer surface of one end of the threaded slide 14 has an arc-shaped structure. During operation, the rotation of the second lead screw 17 can drive the two sets of threaded slides 14 to move, thereby adjusting the position of the threaded slide 14 according to the width of the printing plate. When the movable locking strip 5 fixes the printing plate, it locks the movable locking heads 16 at the four corners of the printing plate and limits them at four points.

[0027] A stop bar is fixedly installed on one side of the outer surface of the movable card strip 5 between the two sets of movable card heads 16. A docking slider 19 is fixedly installed on both ends of the outer surface of the movable card strip 5. During operation, the design of the stop bar structure can support the lower part of the printing plate when the two sets of movable card strips 5 are used to fix the printing plate, so as to prevent the printing plate from falling down between the two sets of movable card strips 5.

[0028] The inner side of the positioning frame 3 is provided with a sliding groove for use with the docking slider 19. A fastening bolt 18 is movably installed on one side of a set of docking sliders 19. During operation, the movement of the docking slider 19 in the sliding groove is used to move the positions of the two sets of moving clips 5 in the positioning frame 3. The moving clips 5 and the positioning frame 3 are locked and fixed by rotating the fastening bolt 18 using the threaded structure.

[0029] A printing machine 2 is movably installed above the operating table 1. The operating tables 1 and 2 are movably connected by a movable back plate 20. A controller 7 is provided at the front end of the operating table 1. During operation, the controller 7 is used to control and adjust the use of the printing machine 2, the positioning frame 3 and the moving card strip 5. The solder paste is printed onto the soldering position of the PCB board 6 through the holes of the printing plate by the movement of the printing machine 2.

[0030] A high-precision positioning mechanism for a solder paste printing machine, in use, is achieved by a motor driving a first lead screw 12 to rotate, which in turn drives the moving clamps 11 to move. The surface of the first lead screw 12 has a unidirectional thread structure, allowing the two sets of moving clamps 11 to move independently during rotation. These two sets of moving clamps 11 are respectively positioned on both sides of a PCB board 6. The four sets of moving clamps 11 complete the positioning operation on all four sides of the PCB board 6. The displacement of the moving clamps 11 can also be adjusted. This operation can limit and fix PCB boards 6 of different sizes, preventing movement during solder paste printing. Furthermore, a rack and pinion mechanism 8 can be used to... The sliding base 4 is moved to move out of the lower part of the positioning frame 3, making it convenient for the user to install the PCB board 6 inside the sliding base 4. After the PCB board 6 is installed and positioned, the sliding base 4 is moved back to the lower part of the positioning frame 3 so that the PCB board 6 and the printed circuit board are aligned vertically. At the same time, the PCB board 6 can be moved back and forth. Secondly, when the moving clamp 11 clamps and positions the PCB board 6, the elastic clip 13 contacts the side of the PCB board 6. Through the elastic structure of the elastic clip 13, the four sides of the PCB board 6 can be clamped elastically, preventing the moving clamp 11 from bending when clamping and fixing the PCB board 6. During operation, the rotation of the second lead screw 17 drives the two sets of threaded slide blocks 14 to move, thereby adjusting the position of the threaded slide blocks 14 according to the width of the printing plate. This allows the moving clips 5 to lock the moving clips 16 at the four corners of the printing plate when fixing it, providing four-point limiting. The second lead screw 17 can be driven manually or by a motor. The design of the stop bar structure supports the lower part of the printing plate when the two sets of moving clips 5 are fixing it, preventing the printing plate from falling downwards between the two sets of moving clips 5. Furthermore, the docking slider 19 within the groove... The two sets of moving clips 5 are moved within the positioning frame 3. The moving clips 5 and the positioning frame 3 are locked and fixed by rotating the fastening bolt 18 using the threaded structure. The installation position of the printed circuit board can be adjusted laterally by adjusting the position of the moving clips 5. Secondly, the elastic clip 13 can be driven to move up and down by rotating the vertical screw 15. The height of the printed circuit board can be controlled by the vertical movement of the positioning frame 3, thereby adjusting the distance between the printed circuit board and the PCB board 6. When the printing machine 2 performs solder paste printing operation, the solder paste printing thickness of the printing machine 2 can be adjusted.

[0031] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A high-precision positioning mechanism for a solder paste printing machine, characterized in that, The system includes an operating table (1), a positioning frame (3), and a sliding base (4). The sliding base (4) is movably installed at the middle of the upper outer surface of the operating table (1). The positioning frame (3) is located above the sliding base (4) and is fixedly connected to the operating table (1). A cross slide (10) is fixedly installed on the inner side of the sliding base (4). Four sets of movable clamps (11) for positioning the PCB board (6) are movably installed on the upper outer surface of the cross slide (10). Two sets of movable clips (5) for positioning the PCB board are movably installed on the inner side of the positioning frame (3). Two sets of movable clips (16) are movably installed on one side of the outer surface of the movable clips (5).

2. The high-precision positioning mechanism for a solder paste printing machine according to claim 1, characterized in that, The cross slide (10) is internally fitted with a first lead screw (12) for driving the moving clamp (11), and the four sets of moving clamps (11) are arranged symmetrically in a cross shape.

3. The high-precision positioning mechanism for a solder paste printing machine according to claim 2, characterized in that, The upper end of the cross slide (10) is provided with a slide groove for use with the movable clamp (11), and a rack (8) is fixedly installed at the middle position of the lower outer surface of the sliding base (4).

4. The high-precision positioning mechanism for a solder paste printing machine according to claim 3, characterized in that, The lower end of the movable clamp (11) is fixedly installed with a threaded slide (14), the middle part of the threaded slide (14) is provided with a threaded groove, the bottom of the rack (8) is provided with a driver (9), and the driver (9) and the operating table (1) are fixedly connected.

5. A high-precision positioning mechanism for a solder paste printing machine according to claim 4, characterized in that, One side of the movable clamp (11) is elastically fitted with an elastic clamp head (13), and the movable clamp (11) and the elastic clamp head (13) are elastically connected by a spring.

6. The high-precision positioning mechanism for a solder paste printing machine according to claim 1, characterized in that, Vertical screws (15) are movably installed at the middle of both ends of the positioning frame (3), and sliders are provided at both ends of the positioning frame (3) on both sides of the vertical screws (15).

7. A high-precision positioning mechanism for a solder paste printing machine according to claim 4, characterized in that, The movable card strip (5) and the two sets of movable card heads (16) are movably connected by the second lead screw (17), and the outer surface of one end of the threaded slide (14) is an arc-shaped structure.

8. A high-precision positioning mechanism for a solder paste printing machine according to claim 7, characterized in that, A stop bar is fixedly installed on one side of the outer surface of the movable card strip (5) between two sets of movable card heads (16), and docking sliders (19) are fixedly installed on both ends of the outer surface of the movable card strip (5).

9. A high-precision positioning mechanism for a solder paste printing machine according to claim 8, characterized in that, The inner side of the positioning frame (3) is provided with a groove for use with the docking slider (19), and a fastening bolt (18) is movably installed on one side of a set of docking sliders (19).

10. A high-precision positioning mechanism for a solder paste printing machine according to claim 1, characterized in that, A printing press (2) is movably installed above the operating table (1). The operating table (1) and the operating table (1) are movably connected by a movable back plate (20). A controller (7) is provided at the front end of the operating table (1).

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