A printing device and method for thick copper multi-layer PCB boards based on vacuum technology

Abstract

The present invention relates to the technical field of PCB board printing devices, and particularly to a thick copper multi-layer PCB board printing device and method based on vacuum technology. In the present invention, the lower surface of the PCB board body stacked at the top of the feeding plate is attached to the upper surface of the workbench, so as to drive the PCB board body to pass through the feeding table, the workbench, and the discharging table in sequence, realizing continuous and automatic loading and unloading, without the need for manual loading and unloading in front of the workbench, thereby reducing the use of manpower and improving the printing efficiency; through one-time air extraction and one-time air exhaust, the printing of several PCB board bodies can be completed. Compared with the traditional printing method, the same amount of energy consumption can print more PCB board bodies, saving the use of energy and saving the printing time; the first PCB board body is positioned by two clamping blocks one and two clamping blocks two, so as to ensure that the first PCB board body is located at the processing position, facilitating printing.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board printing devices, and specifically to a thick copper multi-layer PCB board printing device and method based on vacuum technology. Background Technique

[0002] A PCB board printer, also known as a PCB board screen printer, is divided into a non-vacuum screen printer and a vacuum screen printer, and mainly prints circuit board patterns with solder mask.

[0003] The mechanism of the pressing part of the PCB board of the vacuum printer is installed in a sealed vacuum chamber made of steel plates, a vacuum door is installed on the operation surface, and a multi-layer PCB board is pressed through a hydraulic system under a vacuum state. Since the number of layers of thick copper multi-layer PCB boards is increasing, and the corresponding thickness of the PCB is also getting thicker, at this time, simply increasing the tonnage and pressure of the non-vacuum laminator can no longer meet the quality requirements of thick copper multi-layer PCB boards. Only before applying pressure to the thick copper multi-layer PCB board, perform a vacuum pumping process on the thick copper multi-layer PCB board through vacuum technology to remove the air between the layers of the thick copper multi-layer PCB board and reduce the thickness of the bonding resin between the layers, so as to compact, flatten, and firmly press the high multi-layer and thick copper multi-layer PCB boards; after the pressing is completed, the vacuum chamber is inflated, then the vacuum door is opened, and the thick copper multi-layer PCB board can be taken out.

[0004] However, for the existing thick copper multi-layer PCB board printing device based on vacuum technology, during the use process, manual labor is required to stand in front of the workbench for loading and unloading. Each time a thick copper multi-layer PCB board is processed, a pumping and intake operation needs to be performed. Long-term manual work will cause fatigue, resulting in a reduction in printing efficiency. Frequent pumping and intake operations lead to a large consumption of energy. Summary of the Invention

[0005] The purpose of the present invention is to provide a thick copper multi-layer PCB board printing device and method based on vacuum technology to solve the problems raised in the above background technique. The problems to be solved by the present invention are: how to improve the efficiency of loading and unloading during the printing process, and how to reduce the use of energy.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A thick copper multi-layer PCB board printing device based on vacuum technology, including a vacuum chamber. Inside the vacuum chamber, there are successively arranged a discharge table, a PCB board screen printing machine body, and a feeding table from left to right. At the center of the working table of the PCB board screen printing machine body, there is a processing position. Inside the discharge table, there is a discharge mechanism. Inside the feeding table, there is a feeding mechanism. The feeding mechanism includes a feeding port. Inside the feeding table, there is a feeding port. At the bottom of the feeding table, directly below the feeding port, there is a feeding box. At the bottom of the feeding box, there is an electric push rod one. The telescopic end of the electric push rod one is provided with a feeding plate. The feeding plate is slidably connected to the feeding box and is also slidably connected to the feeding port. At the top of the feeding plate, several PCB board bodies are movably arranged. The several PCB board bodies are stacked vertically. At the top of the feeding table, a multi-section electric push rod is fixedly arranged. The telescopic end of the multi-section electric push rod is provided with a push plate. On the front side wall of the feeding box, there is a hinged sealing door one. Inside the working table, there is a clamping component.

[0007] In a preferred embodiment: The discharge mechanism includes a discharge port arranged inside the discharge table. At the bottom of the discharge table, directly below the discharge port, there is a discharge box. At the bottom of the discharge box, there is an electric push rod two. The telescopic end of the electric push rod two is provided with a discharge plate. Through a placement groove at the top of the discharge plate, a discharge box is movably arranged. Both the discharge plate and the discharge box are movably connected to the discharge port.

[0008] In a preferred embodiment: The discharge plate is slidably connected to the discharge box. The discharge box is movably connected to the discharge box. On the front side wall of the discharge box, there is a hinged sealing door two.

[0009] In a preferred embodiment: The clamping component includes a power chamber, a belt one, a belt two, a belt three, a rotating shaft one, and a rotating shaft two. Inside the working table, there is a power chamber. Inside the power chamber, the rotating shaft one and the rotating shaft two that are rotatably connected are symmetrically arranged. At the top of the working table, several clamping blocks one and clamping blocks two are rotatably arranged. The clamping blocks one are located in front of the processing position, and the clamping blocks two are located behind the processing position. The top of the rotating shaft one is fixedly connected to the clamping block one, and the top of the rotating shaft two is fixedly connected to the clamping block two. Between the two rotating shafts one, they are rotationally connected through a belt one. Between the two rotating shafts two, they are rotationally connected through a belt two. Between one side of the rotating shaft one and the rotating shaft two, they are rotationally connected through a belt three. At the bottom inner wall of the working table, there is a motor. The output shaft of the motor is fixedly connected to one of the rotating shafts one.

[0010] In a preferred embodiment: The two clamping blocks one are symmetrically arranged, and the two clamping blocks two are symmetrically arranged.

[0011] In a preferred embodiment: Both the first belt and the second belt are connected in a figure-eight shape, and the third belt is connected in a figure-eight shape.

[0012] In a preferred embodiment: The upper surface of the discharge table, the upper surface of the workbench, and the upper surface of the feeding table are in the same plane, and the lower surface of the push plate is slidably connected to the upper surface of the feeding table.

[0013] In a preferred embodiment: The lower surface of the push plate is slidably connected to the upper surface of the workbench, and the lower surface of the push plate is slidably connected to the upper surface of the discharge table.

[0014] In a preferred embodiment: An air extraction pipe and an air inlet pipe are provided at the top of the vacuum box, and the air inlet pipe is located on the right side of the air extraction pipe.

[0015] The present invention also includes a printing method for a thick copper multi-layer PCB printing device based on vacuum technology. The specific usage method is as follows:

[0016] Step 1: Loading; This device is electrically connected to an external control device. In the initial state, the first electric push rod is fully retracted, the second electric push rod is fully extended, the first sealing door is opened, and several PCB board bodies are stacked vertically on the feeding plate. The topmost one is the first PCB board body until the lower surface of the first PCB board body is in the same plane as the lower surface of the push plate. Then the first sealing door is closed. The air extraction pipe is connected to an external air extraction fan, and the air inlet pipe is connected to an external air inlet fan. The air extraction pipe is started to extract air outward until a vacuum state is reached.

[0017] Step 2: Positioning; The multi-section electric push rod extends to drive the push plate to move leftward. The push plate pushes the first PCB board body to move leftward until the first PCB board body moves to the processing position at the center of the workbench. The first electric push rod extends to drive the feeding plate to move upward until the upper surface of the second PCB board body fits the upper surface of the workbench. The output shaft of the motor drives the first rotating shaft connected thereto to rotate forward. The first rotating shaft drives the first belt and the third belt to rotate. Both the first belt and the second belt are connected in a figure-eight shape. The first belt drives the two first rotating shafts to rotate in the opposite direction. The two first rotating shafts both drive the first clamping blocks to rotate inward, so that the ends of the first clamping blocks approach the front side wall of the first PCB board body. The third belt is connected in a figure-eight shape. The third belt drives the right first rotating shaft and the right second rotating shaft to rotate in the opposite direction. The right second rotating shaft drives the left second rotating shaft to rotate through the second belt. The right second rotating shaft and the left second rotating shaft rotate in opposite directions. The two second rotating shafts both drive the second clamping blocks to rotate inward, so that the ends of the second clamping blocks approach the rear side wall of the first PCB board body. Thus, the first PCB board body is positioned by the two first clamping blocks and the two second clamping blocks, ensuring that the first PCB board body is located at the processing position for easy printing.

[0018] Step 3: Printing; the output shaft of the motor rotates reversely, driving the first clamping block and the second clamping block to rotate reversely and reset. The multi-stage electric push rod contracts to drive the push plate to move to the right until the push plate disengages from the workbench, so that the first clamping block, the second clamping block, and the push plate are out of the printing range of the PCB screen printer body. The PCB screen printer body operates for printing;

[0019] Step 4: Unloading; after printing is completed, the multi-stage electric push rod continues to extend to drive the push plate to move to the left. The push plate pushes the first PCB board body to move to the left until the first PCB board body moves into the discharge box. The second electric push rod contracts to drive the discharge plate, the discharge box, and the first PCB board body to move downward by a certain distance, so that the lower surface of the first PCB board body is in contact with the upper surface of the workbench, completing the printing of the first PCB board body;

[0020] Step 5: Repeat the above steps to print the second PCB board body, and print several PCB board bodies in sequence. After all the PCB board bodies on the feeding plate are printed, start the air blower, and introduce air into the vacuum box through the air inlet pipe to balance the internal and external air pressures. Open the second sealing door, and take out the discharge box and the PCB board body.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0022] By setting the first electric push rod, the feeding plate, the second electric push rod, and the discharge box, the first electric push rod drives the feeding plate to move up or down, so that the lower surface of the PCB board body stacked at the top of the feeding plate is in contact with the upper surface of the workbench, thereby driving the PCB board body to pass through the feeding table, the workbench, and the discharge table in sequence, realizing continuous and automatic feeding and unloading. There is no need for manual feeding and unloading in front of the workbench, thus reducing the use of manpower and improving the printing efficiency; through one-time air extraction and one-time air exhaust, the printing of several PCB board bodies can be completed. Compared with the traditional printing method, with the same energy consumption, more PCB board bodies can be printed, saving the use of energy and saving printing time; the first PCB board body is positioned by two first clamping blocks and two second clamping blocks, so as to ensure that the first PCB board body is located at the processing position, facilitating printing. Description of the Drawings

[0023] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2It is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 is the present invention Figure 2 The sectional view taken along line A-A in the present invention;

[0027] Figure 4 is the present invention Figure 2 The sectional view taken along line B-B in the present invention;

[0028] Figure 5 is the schematic diagram of the structure of the first belt in the present invention;

[0029] Figure 6 is the present invention Figure 4 The partial enlarged view at position A in the present invention;

[0030] In the figure: 1. Vacuum box; 2. Discharge table; 3. PCB screen printer body; 4. Feeding table; 5. Workbench; 6. First electric push rod; 7. Feeding port; 8. Feeding box; 9. Feeding plate; 10. PCB body; 11. Multi-section electric push rod; 12. Push plate; 13. First sealing door; 14. Discharge port; 15. Discharge box; 16. Second electric push rod; 17. Discharge plate; 18. Discharge box; 19. Second sealing door; 20. Power chamber; 21. First belt; 22. Second belt; 23. First rotating shaft; 24. Second rotating shaft; 25. First clamping block; 26. Second clamping block; 27. Third belt; 28. Exhaust duct; 29. Air inlet duct; 30. Motor. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-3, the present invention provides a technical solution: a thick copper multi-layer PCB printing device based on vacuum technology, including a vacuum chamber 1. The inner wall of the vacuum chamber 1 is sequentially provided with a discharge table 2, a PCB screen printer body 3, and a feeding table 4 from left to right. A processing position is provided at the center of the workbench 5 of the PCB screen printer body 3. A discharge mechanism is provided inside the discharge table 2, and a feeding mechanism is provided inside the feeding table 4. The feeding mechanism includes a feeding port 7. The feeding port 7 is provided inside the feeding table 4. A feeding box 8 is provided at the bottom of the feeding table 4 directly below the feeding port 7. An electric push rod 6 is provided at the bottom of the feeding box 8. The telescopic end of the electric push rod 6 is provided with a feeding plate 9. The feeding plate 9 is slidably connected to the feeding box 8 and is slidably connected to the feeding port 7. A plurality of PCB board bodies 10 are movably provided at the top of the feeding plate 9. The plurality of PCB board bodies 10 are stacked and placed vertically. A multi-stage electric push rod 11 is fixedly provided at the top of the feeding table 4. The telescopic end of the multi-stage electric push rod 11 is provided with a push plate 12. A sealing door 13 is hinged to the front side wall of the feeding box 8. A clamping assembly is provided inside the workbench 5. The discharge plate 17 is slidably connected to the discharge box 15. The discharge box 18 is movably connected to the discharge box 15. A sealing door 19 is hinged to the front side wall of the discharge box 15.

[0033] Figures 4-6 , the clamping assembly includes a power chamber 20, a belt 1 21, a belt 2 22, a belt 3 27, a rotating shaft 1 23, and a rotating shaft 2 24. The power chamber 20 is provided inside the workbench 5. The inner wall of the power chamber 20 is symmetrically provided with a rotating shaft 1 23 and a rotating shaft 2 24 that are rotatably connected. A plurality of clamping blocks 1 25 and clamping blocks 2 26 are rotatably provided at the top of the workbench 5. The clamping blocks 1 25 are located in front of the processing position, and the clamping blocks 2 26 are located behind the processing position. The top of the rotating shaft 1 23 is fixedly connected to the clamping blocks 1 25, and the top of the rotating shaft 2 24 is fixedly connected to the clamping blocks 2 26. The two rotating shafts 1 23 are rotationally connected by a belt 1 21, the two rotating shafts 2 24 are rotationally connected by a belt 2 22, and the rotating shaft 1 23 and the rotating shaft 2 24 on one side are rotationally connected by a belt 3 27. A motor 30 is provided on the inner wall of the bottom of the workbench 5. The output shaft of the motor 30 is fixedly connected to one of the rotating shafts 1 23.

[0034] It should be noted that the two clamping blocks 25 are symmetrically arranged, the two clamping blocks 26 are symmetrically arranged, the first belt 21 and the second belt 22 are both connected in a figure-eight shape, the third belt 27 is connected in a figure-eight shape, the upper surfaces of the discharging table 2, the working table 5 and the feeding table 4 are in the same plane, the lower surface of the pushing plate 12 is slidably connected to the upper surface of the feeding table 4, the lower surface of the pushing plate 12 is slidably connected to the upper surface of the working table 5, the lower surface of the pushing plate 12 is slidably connected to the upper surface of the discharging table 2, the top end of the vacuum box 1 is provided with an air extraction pipe 28 and an air inlet pipe 29, and the air inlet pipe 29 is located on the right side of the air extraction pipe 28.

[0035] The present invention also includes a printing method for a thick copper multi-layer PCB printing device based on vacuum technology, and the specific usage method is as follows:

[0036] Step 1: Loading; this device is electrically connected to an external control device. In the initial state, the first electric push rod 6 is fully retracted, the second electric push rod 16 is fully extended, the first sealing door 13 is opened, and a plurality of PCB board bodies 10 are stacked up and down on the feeding plate 9. The topmost one is the first PCB board body 10 until the lower surface of the first PCB board body 10 is in the same plane as the lower surface of the pushing plate 12. Then the first sealing door 13 is closed. The air extraction pipe 28 is connected to an external air extraction fan, and the air inlet pipe 29 is connected to an external air inlet fan. The air extraction pipe 28 is started to extract air outwards until a vacuum state is reached.

[0037] Step 2: Positioning; The multi-section electric push rod 11 extends to drive the push plate 12 to move leftward. The push plate 12 pushes the first PCB board body 10 to move leftward until the first PCB board body 10 moves to the processing position at the center of the workbench 5. The electric push rod 6 extends to drive the feeding plate 9 to move upward until the upper surface of the second PCB board body 10 fits the upper surface of the workbench 5. The output shaft of the motor 30 drives the first rotating shaft 23 connected thereto to rotate forward. The first rotating shaft 23 drives the first belt 21 and the third belt 27 to rotate. The first belt 21 and the second belt 22 are both connected in a figure-eight shape. The first belt 21 drives the two first rotating shafts 23 to rotate in opposite directions. The two first rotating shafts 23 both drive the first clamping blocks 25 to rotate inward, so that the ends of the first clamping blocks 25 approach the front side wall of the first PCB board body 10. The third belt 27 is connected in a figure-eight shape. The third belt 27 drives the right first rotating shaft 23 and the right second rotating shaft 24 to rotate in opposite directions. The right second rotating shaft 24 drives the left second rotating shaft 24 to rotate through the second belt 22. The right second rotating shaft 24 and the left second rotating shaft 24 rotate in opposite directions. The two second rotating shafts 24 both drive the second clamping blocks 26 to rotate inward, so that the ends of the second clamping blocks 26 approach the rear side wall of the first PCB board body 10. Thus, the first PCB board body 10 is positioned by the two first clamping blocks 25 and the two second clamping blocks 26, ensuring that the first PCB board body 10 is located at the processing position for easy printing.

[0038] Step 3: Printing; The output shaft of the motor 30 rotates in the reverse direction, driving the first clamping blocks 25 and the second clamping blocks 26 to rotate in the reverse direction and reset. The multi-section electric push rod 11 contracts to drive the push plate 12 to move rightward until the push plate 12 disengages from the workbench 5, so that the first clamping blocks 25, the second clamping blocks 26, and the push plate 12 are out of the printing range of the PCB screen printer body 3. The PCB screen printer body 3 operates for printing.

[0039] Step 4: Discharging; After printing is completed, the multi-section electric push rod 11 continues to extend to drive the push plate 12 to move leftward. The push plate 12 pushes the first PCB board body 10 to move leftward until the first PCB board body 10 moves into the discharge box 18. The electric push rod 16 contracts to drive the discharge plate 17, the discharge box 18, and the first PCB board body 10 to move downward by a certain distance, so that the lower surface of the first PCB board body 10 fits the upper surface of the workbench 5, completing the printing of the first PCB board body 10.

[0040] Step Five: Repeat the above steps to print the second PCB board body 10, and sequentially print several PCB board bodies 10. After all the PCB board bodies 10 on the feeding board 9 are printed, start the air inlet fan, and introduce air into the vacuum chamber 1 through the air inlet pipe 29 to balance the internal and external air pressures. Open the second sealing door 19, and take out the discharge box 18 and the PCB board body 10. Through one-time air extraction and one-time air exhaust, the printing of several PCB board bodies 10 can be completed. Compared with the traditional printing method, the same amount of energy can be used to print more PCB board bodies 10, saving the use of energy and saving the printing time.

[0041] Working principle of the present invention:

[0042] By setting the first electric push rod 6, the feeding board 9, the second electric push rod 16 and the discharge box 18, the first electric push rod 6 drives the feeding board 9 to move up or down, so that the lower surface of the topmost stacked PCB board body 10 on the feeding board 9 is attached to the upper surface of the workbench 5, thereby driving the PCB board body 10 to sequentially pass through the feeding table 4, the workbench 5 and the discharge table 2, realizing continuous and automatic feeding and discharging, without the need for manual standing in front of the workbench 5 for loading and unloading, thus reducing the use of manpower and improving the printing efficiency; through one-time air extraction and one-time air exhaust, the printing of several PCB board bodies 10 can be completed. Compared with the traditional printing method, the same amount of energy can be used to print more PCB board bodies 10, saving the use of energy and saving the printing time; the first PCB board body 10 is positioned by two clamping blocks one 25 and two clamping blocks two 26, so as to ensure that the first PCB board body 10 is located at the processing position for easy printing.

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, 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 thick copper multi-layer PCB board printing device based on vacuum technology, including a vacuum chamber (1), Characterized in that: An unloading table (2), a PCB screen printer body (3), and a loading table (4) are sequentially arranged on the inner wall of the vacuum chamber (1) from left to right. A processing position is arranged at the center of the workbench (5) of the PCB screen printer body (3). An unloading mechanism is arranged on the inner wall of the unloading table (2), and a loading mechanism is arranged on the inner wall of the loading table (4). The loading mechanism includes a loading port (7). The loading port (7) is arranged on the inner wall of the loading table (4). A loading box (8) is arranged directly below the loading port (7) at the bottom of the loading table (4). An electric push rod one (6) is arranged at the bottom of the loading box (8). A loading plate (9) is arranged at the telescopic end of the electric push rod one (6). The loading plate (9) is slidably connected to the loading box (8) and the loading port (7). A plurality of PCB board bodies (10) are movably arranged at the top of the loading plate (9). The plurality of PCB board bodies (10) are stacked vertically. A multi-stage electric push rod (11) is fixedly arranged at the top of the loading table (4). A push plate (12) is arranged at the telescopic end of the multi-stage electric push rod (11). A sealing door one (13) is hinged on the front side wall of the loading box (8). A clamping assembly is arranged on the inner wall of the workbench (5); The clamping assembly includes a power chamber (20), a belt one (21), a belt two (22), a belt three (27), a rotating shaft one (23), and a rotating shaft two (24). A power chamber (20) is arranged on the inner wall of the workbench (5). The rotating shaft one (23) and the rotating shaft two (24) which are rotatably connected are symmetrically arranged on the inner wall of the power chamber (20). A plurality of clamping blocks one (25) and clamping blocks two (26) are rotatably arranged at the top of the workbench (5). The clamping blocks one (25) are located in front of the processing position, and the clamping blocks two (26) are located behind the processing position. The top of the rotating shaft one (23) is fixedly connected to the clamping blocks one (25), and the top of the rotating shaft two (24) is fixedly connected to the clamping blocks two (26). The two rotating shafts one (23) are rotationally connected by a belt one (21), the two rotating shafts two (24) are rotationally connected by a belt two (22), and the rotating shaft one (23) and the rotating shaft two (24) on one side are rotationally connected by a belt three (27). A motor (30) is arranged on the bottom inner wall of the workbench (5). The output shaft of the motor (30) is fixedly connected to one of the rotating shafts one (23); The two clamping blocks one (25) are symmetrically arranged, the two clamping blocks two (26) are symmetrically arranged, both the belt one (21) and the belt two (22) are connected in a figure-eight shape, and the belt three (27) is connected in a figure-eight shape.

2. A thick copper multi-layer PCB board printing device based on vacuum technology according to claim 1, Characterized in that: The discharging mechanism includes a discharge port (14) which is arranged on the inner wall of the discharge table (2). At the bottom of the discharge table (2) and directly below the discharge port (14), a discharge box (15) is provided. An electric push rod two (16) is arranged at the bottom of the discharge box (15). The telescopic end of the electric push rod two (16) is provided with a discharge plate (17). The discharge plate (17) is movably provided with a discharge box (18) through a placement groove at its top. Both the discharge plate (17) and the discharge box (18) are movably connected to the discharge port (14).

3. The printed circuit board printing device for thick copper multi-layer PCB based on vacuum technology according to claim 2, characterized in that: The discharge plate (17) is slidably connected to the discharge box (15), the discharge box (18) is movably connected to the discharge box (15), and a second sealing door (19) is hinged to the front side wall of the discharge box (15).

4. The printed circuit board printing device for thick copper multi-layer PCB based on vacuum technology according to claim 3, characterized in that: The upper surface of the discharge table (2), the upper surface of the workbench (5) and the upper surface of the feeding table (4) are in the same plane, and the lower surface of the push plate (12) is slidably connected to the upper surface of the feeding table (4).

5. The printed circuit board printing device for thick copper multi-layer PCB based on vacuum technology according to claim 4, characterized in that: The lower surface of the push plate (12) is slidably connected to the upper surface of the workbench (5), and the lower surface of the push plate (12) is slidably connected to the upper surface of the discharge table (2).

6. The printed circuit board printing device for thick copper multi-layer PCB based on vacuum technology according to claim 5, characterized in that: An air extraction pipe (28) and an air inlet pipe (29) are arranged at the top of the vacuum box (1), and the air inlet pipe (29) is located on the right side of the air extraction pipe (28).

7. The printing method of the printed circuit board printing device for thick copper multi-layer PCB based on vacuum technology according to claim 6, characterized in that: The specific usage method is as follows: Step 1: Loading; This device is electrically connected to an external control device. In the initial state, the electric push rod one (6) is fully retracted, the electric push rod two (16) is fully extended, the first sealing door (13) is opened, and several PCB board bodies (10) are stacked vertically on the feeding plate (9). The topmost one is the first PCB board body (10) until the lower surface of the first PCB board body (10) is in the same plane as the lower surface of the push plate (12). Then the first sealing door (13) is closed. The air extraction pipe (28) is connected to an external air extraction fan, and the air inlet pipe (29) is connected to an external air inlet fan. The air extraction pipe (28) is started to extract air outward until a vacuum state is reached; Step 2: Positioning; The multi - section electric push rod (11) extends to drive the push plate (12) to move leftward. The push plate (12) pushes the first PCB board body (10) to move leftward until the first PCB board body (10) moves to the processing position at the center of the workbench (5). The electric push rod 1 (6) extends to drive the feeding plate (9) to move upward until the upper surface of the second PCB board body (10) fits the upper surface of the workbench (5). The output shaft of the motor (30) drives the first rotating shaft (23) connected to it to rotate forward. The first rotating shaft (23) drives the first belt (21) and the third belt (27) to rotate. Both the first belt (21) and the second belt (22) are in a figure - eight connection. The first belt (21) drives the two first rotating shafts (23) to rotate in the opposite direction. The two first rotating shafts (23) both drive the first clamping blocks (25) to rotate inward, making the ends of the first clamping blocks (25) approach the front side wall of the first PCB board body (10). The third belt (27) is in a figure - eight connection. The third belt (27) drives the first rotating shaft (23) on the right side and the second rotating shaft (24) on the right side to rotate in the opposite direction. The second rotating shaft (24) on the right side drives the second rotating shaft (24) on the left side to rotate through the second belt (22). The second rotating shafts (24) on the right side and the left side rotate in opposite directions. The two second rotating shafts (24) both drive the second clamping blocks (26) to rotate inward, making the ends of the second clamping blocks (26) approach the rear side wall of the first PCB board body (10). Thus, the first PCB board body (10) is positioned by the two first clamping blocks (25) and the two second clamping blocks (26), ensuring that the first PCB board body (10) is located at the processing position for easy printing. Step 3: Printing; The output shaft of the motor (30) rotates in the reverse direction, driving the first clamping blocks (25) and the second clamping blocks (26) to rotate in the reverse direction and reset. The multi - section electric push rod (11) contracts to drive the push plate (12) to move rightward until the push plate (12) disengages from the workbench (5), so that the first clamping blocks (25), the second clamping blocks (26), and the push plate (12) are out of the printing range of the PCB screen printer body (3). The PCB screen printer body (3) operates for printing. Step 4: Discharging; After printing is completed, the multi - section electric push rod (11) continues to extend to drive the push plate (12) to move leftward. The push plate (12) pushes the first PCB board body (10) to move leftward until the first PCB board body (10) moves into the discharge box (18). The electric push rod 2 (16) contracts to drive the discharge plate (17), the discharge box (18), and the first PCB board body (10) to move downward by a certain distance, making the lower surface of the first PCB board body (10) fit the upper surface of the workbench (5), completing the printing of the first PCB board body (10). Step Five: Repeat the above steps to print the second PCB board body (10), and sequentially print several PCB board bodies (10). After all the PCB board bodies (10) on the feeding plate (9) are printed, start the air inlet fan, and introduce air into the vacuum chamber (1) through the air inlet pipe (29) to balance the internal and external air pressures. Then open the second sealing door (19) and take out the discharge box (18) and the PCB board body (10).

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