A through-hole three-dimensional solder paste printing device

Abstract

The present invention discloses a through-hole three-dimensional solder paste printing device, comprising a frame and a printing chamber located on the upper part of the frame, wherein the printing chamber is sequentially equipped with an arch frame, a Y-direction precise traction system, a printing head system, a scraper, a metal template quick fixing mechanism, a flexible metal template and a negative pressure support cavity from top to bottom; the printing head system is fixed on the arch frame; the arch frame is installed on a sliding guide rail above the Y-direction precise traction system and moves in the Y direction along the sliding guide rail; the scraper is installed below the printing head system; the flexible metal template is installed in the groove of the metal template quick fixing mechanism; the negative pressure support cavity is located at the bottom of the printing chamber. The present invention has a novel structural design, uses upward extrusion and downward pulling, adopts a mature printing process, can print in both round-trip printing strokes, has high printing efficiency, and prints solder paste evenly.

Description

Technical Field

[0001] The invention relates to a through-hole three-dimensional solder paste printing device, belonging to the technical field of PCB printing equipment for electronic product manufacturing. Background Art

[0002] Electronics manufacturing technology, commonly known as surface mount technology (SMT), primarily involves three steps: solder paste printing, component placement, and soldering. Solder paste printing is the most critical step in the SMT process, accounting for 60-70% of defects in electronic product manufacturing. The general steps for solder paste printing include installing a metal stencil, applying solder paste to the stencil, installing a scraper, importing the PCB, imprinting the solder paste, separating the printed parts, and exporting the PCB. The specific working principle involves first creating a laser metal stencil based on the PCB pad layout. Holes are then created in the laser metal stencil where through-hole printing is required. Solder paste printing is then completed according to the general solder paste printing process, transferring the solder paste to the PCB pads and through-holes.

[0003] Compared to conventional SMT processes, through-hole reflow processes use significantly more solder paste—approximately 30 times more. Traditional through-hole solder paste printing processes primarily employ two methods: increasing solder paste deposits and increasing the amount of masked solder paste printed. Both methods can result in significant waste, and the amount of solder paste in the through-holes can still be insufficient, resulting in weak solder joints and reduced electronic product reliability. Furthermore, through-hole solder paste printing is prone to excessive residue, making cleanup difficult and leading to defects such as cold solder joints, bridging, and tombstoning. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a through-hole three-dimensional solder paste printing device with novel structural design, upper extrusion and lower pulling, mature printing technology, and both round-trip printing strokes can be printed, with high printing efficiency and uniform solder paste printing.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] The present invention provides a through-hole three-dimensional solder paste printing device, comprising a frame and a printing chamber located on the upper part of the frame, wherein the printing chamber is equipped with an arch frame, a Y-axis precision traction system, a printing head system, a scraper, a metal template fast fixing mechanism, a flexible metal template, and a negative pressure support chamber in order from top to bottom;

[0007] The printing head system is mounted and fixed on the arch;

[0008] The arch frame is installed on the sliding guide rail above the Y-direction precise traction system and moves in the Y direction along the sliding guide rail;

[0009] The scraper is installed below the printing head system;

[0010] The flexible metal template is installed in the groove of the metal template quick fixing mechanism;

[0011] The negative pressure supporting chamber is located at the bottom of the printing chamber.

[0012] Furthermore, a control and storage room is provided at the lower part of the frame, and a compressed gas storage tank is provided in the control and storage room.

[0013] Furthermore, the printing head system includes a printing head system body, a squeegee head Z-direction fixed beam, a forward squeegee head lifting cylinder, a backward squeegee head lifting cylinder, a squeegee head frame, a squeegee head Z-direction precise traction system, and a printing head mounting hole;

[0014] The printing head mounting holes are opened on both sides of the printing head system body, the arch frame passes through the printing head mounting holes, and the printing head system body is fixed to the arch frame by bolts;

[0015] The Z-direction precise traction system of the scraper head is fixed on the main body of the printing head system, and the Z-direction precise traction system of the scraper head includes a traction motor, a Z-direction micro-traction ball screw, a Z-direction sliding guide and a traction nut. The Z-direction sliding guide is installed on the main body of the printing head system, and the Z-direction micro-traction ball screw is rotatably arranged on one side of the Z-direction sliding guide. The traction nut is threadedly connected to the outer surface of the Z-direction micro-traction ball screw, and the traction nut is connected to the Z-direction fixed beam of the scraper head. The traction motor drives the Z-direction micro-traction ball screw to rotate through a coupling, thereby driving the traction nut to lead the Z-direction fixed beam of the scraper head to perform precise up and down movement in the Z direction along the upper half of the Z-direction sliding guide.

[0016] The base ends of the forward scraper head lifting cylinder and the backward scraper head lifting cylinder are fixed on the scraper head Z-direction fixed beam, and the protruding ends are connected to the scraper head frame; the scraper head frame moves precisely up and down in the Z direction along the lower half of the Z-direction sliding guide rail.

[0017] Furthermore, the scraper head frame includes a triangular fixing frame, a locking bolt, a main scraper fixing column, a floating scraper hole fixing pin, an auxiliary scraper fixing column, a front scraper head group fixing beam and a rear scraper head group fixing beam;

[0018] The protruding end of the forward scraper head lifting cylinder is fixed to the front scraper head assembly fixing beam via the triangular fixing frame;

[0019] The main scraper fixing column is locked and fixed with the front scraper head group fixing beam by the locking bolt, and the auxiliary scraper fixing column is locked and fixed with the scraper head group fixing beam;

[0020] The scraper is mounted on the main scraper fixing column and the auxiliary scraper fixing column through the floating scraper hole fixing pin.

[0021] Furthermore, the scraper includes a floating scraper fixing hole, a scraper blade body, a metal scraper surface, a metal scraper surface fixing rivet, and a scraper floating fine-tuning paddle;

[0022] The scraper is inserted into the floating scraper hole fixing pin through the floating scraper fixing hole, the scraper blade body is located on the scraper, the metal scraper surface is installed on the scraper blade body through the metal scraper surface fixing rivet, and the scraper floating fine-tuning paddle is installed above the scraper blade body.

[0023] Furthermore, the scraper floating fine-tuning paddle includes a scraper floating fine-tuning paddle fixing hole, a floating fine-tuning paddle body, and two floating fine-tuning studs. The floating fine-tuning paddle body is installed above the scraper blade body. The scraper floating fine-tuning paddle fixing hole is opened in the middle of the floating fine-tuning paddle body. The two floating fine-tuning studs are respectively threadedly connected to the two sides of the floating fine-tuning paddle body, and the bottoms of the two floating fine-tuning studs are in contact with the upper end surface of the scraper blade body. The scraper floating fine-tuning paddle fixing hole and the floating scraper fixing hole overlap with each other and are jointly inserted into the floating scraper hole fixing pin.

[0024] Furthermore, the metal template quick fixing mechanism includes a C-shaped steel channel, a locking cylinder, a locking rubber washer, a C-shaped steel channel sliding guide rail, and a C-shaped steel channel guide screw;

[0025] A pair of C-shaped steel groove sliding guide rails are respectively installed on both sides of the printing chamber of the frame, the C-shaped steel groove guide screw is rotatably set inside the C-shaped steel groove sliding guide rail, the C-shaped steel groove is slidably set on the C-shaped steel groove sliding guide rail, and the C-shaped steel groove is threadedly connected to the C-shaped steel groove guide screw, the locking cylinder is installed at the uppermost inner side of the C-shaped steel groove, and the output end of the locking cylinder is installed with the locking rubber washer.

[0026] Furthermore, the negative pressure support chamber includes a negative pressure chamber, a sealing silicone felt, an exhaust hole, a sealing cover, a cylinder connector, a support cylinder, an adjustable magnetic support rod, an adjustable magnetic support block and a slag discharge hole;

[0027] The negative pressure chamber is installed under the flexible metal template through multiple supporting cylinders, and the bottom of the negative pressure chamber is fixedly connected with the protruding ends of multiple supporting cylinders through cylinder connectors, and the supporting cylinders are fixed to the bottom of the printing room; the negative pressure chamber forms a closed cavity with the flexible metal template through the sealing silicone felt, and an exhaust hole is opened on the negative pressure chamber, and a sealing cover is installed on the exhaust hole. The adjustable magnetic support rod and the adjustable magnetic support block are adsorbed on the bottom of the negative pressure chamber by magnetic attraction, and the slag discharge hole is opened at the bottom of the negative pressure chamber.

[0028] Furthermore, the Y-axis precision traction system includes a Y-axis sliding guide rail, a Y-axis traction ball screw, a guide rail support pin, a print head system traction screw nut, a coupling, and a motor;

[0029] The two Y-direction sliding guide rails are fixed on both sides of the frame by the guide rail support pins. The arch frame flies over the Y-direction sliding guide rails and is fixedly connected to the traction screw nut of the printing head system. The motor drives the Y-direction traction ball screw to rotate through the coupling, and then drives the arch frame to move back and forth precisely along the Y direction through the traction screw nut of the printing head system.

[0030] Furthermore, the exterior of the frame includes a retractable computer with four universal wheels installed at the bottom.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention provides a through-hole three-dimensional solder paste printing device, which adopts the overprinting technology and the negative pressure adsorption coupling method, has a novel structural design, uses upper extrusion and lower pulling, adopts a mature printing process, can print in both round-trip printing strokes, has high printing efficiency, and prints solder paste evenly. The present invention can realize both flat solder paste printing and through-hole solder paste printing, which is convenient for people to meet the needs of solder paste three-dimensional printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the main structure of the through-hole three-dimensional solder paste printing device provided by an embodiment of the present invention.

[0034] Figure 2 Schematic diagram of the forward and backward movement device of the solder paste printing head Y provided in an embodiment of the present invention.

[0035] Figure 3 It is a schematic diagram of the structure of a printing head system provided by an embodiment of the present invention.

[0036] Figure 4 It is a schematic diagram of the scraper and floating fine-tuning paddle structure provided by an embodiment of the present invention.

[0037] Figure 5It is a structural schematic diagram of a metal template quick fixing mechanism provided by an embodiment of the present invention.

[0038] Figure 6 Schematic diagram of the negative pressure chamber structure provided by an embodiment of the present invention.

[0039] Explanation of the reference numbers: 1. Frame; 2. Print head system; 3. Scraper; 4. Metal template fast fixing mechanism; 5. Flexible metal template; 6. Negative pressure support chamber; 7. Control and storage chamber; 8. Y-axis precise traction system; 9. Arch frame; 10. Retractable computer; 11. Universal wheel; 12. Compressed air tank; 21. Print head system body; 22. Scraper head Z-axis fixed beam; 23. Forward scraper head lifting cylinder; 24. Backward scraper Scraper head lifting cylinder; 25. Scraper head frame; 26. Scraper head Z-axis precision traction system; 27. Print head mounting hole; 31. Floating scraper fixing hole; 32. Scraper blade; 33. Metal scraper surface; 34. Metal scraper surface fixing rivet; 35. Scraper floating fine-tuning paddle; 41. C-shaped steel channel; 42. Locking cylinder; 43. Locking rubber washer; 44. C-shaped steel channel sliding guide; 45. C-shaped steel channel guide screw; 61. Negative pressure Cavity; 62, Sealing silicone felt; 63, Exhaust hole; 64, Sealing cover; 65, Cylinder connector; 66, Support cylinder; 67, Adjustable magnetic support rod; 68, Adjustable magnetic support block; 69, Slag discharge hole; 81, Y-axis sliding guide; 82, Y-axis traction ball screw; 83, Guide rail support pin; 84, Print head system traction screw nut; 85, Coupling; 86, Motor; 251, Triangle fixing bracket; 252, Locking Bolt; 253, main scraper fixing column; 254, floating scraper hole fixing pin; 255, auxiliary scraper fixing column; 256, front scraper head group fixing beam; 257, rear scraper head group fixing beam; 261, traction motor; 262, Z-axis micro-traction ball screw; 263, Z-axis sliding guide; 264, traction nut; 351, scraper floating fine-tuning propeller fixing hole; 352, scraper floating fine-tuning propeller; 353, floating fine-tuning stud. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] Example 1

[0044] In this embodiment, the X direction refers to the direction parallel to the production line where the solder paste printing device is located, also known as "left and right", the Y direction refers to the direction perpendicular to the production line where the solder paste printing device is located, also known as "front and back", and the Z direction refers to the direction perpendicular to the production line where the solder paste printing device is located, also known as "up and down".

[0045] like Figure 1-6 As shown, this embodiment introduces a through-hole 3D solder paste printing device, comprising a frame 1, a print head system 2, a scraper 3, a metal template fast fixing mechanism 4, a flexible metal template 5, a negative pressure support chamber 6, a control and storage chamber 7, a Y-axis precision traction system 8, and an arch 9. The frame 1 is divided into two parts: the upper part is the printing chamber, and the lower part is the control and storage chamber 7. Within the printing chamber, the arch 9, the Y-axis precision traction system 8, the print head system 2, the scraper 3, the metal template fast fixing mechanism 4, the flexible metal template 5, and the negative pressure support chamber 6 are installed in order from top to bottom.

[0046] like Figure 1 and 2As shown, the print head system 2 is mounted on the arch 9 by three bolts. The two ends of the arch 9 are mounted on Y-direction sliding guide rails 81 on the Y-direction precision traction system 8, forming a fixed connection with the print head system traction screw nut 84. The two Y-direction sliding guide rails 81 are respectively mounted on the left and right sides of the printing chamber in the upper half of the frame 1 by the guide rail support pins 83. A motor 86 drives the Y-direction traction ball screw 82 to rotate through a coupling 85. This in turn drives the arch 9 through the print head system traction screw nut 84 to precisely move forward and backward along the Y direction, thereby driving the print head system 2 to precisely move forward and backward along the Y direction, and in turn driving the scraper 3 to slide back and forth along the flexible metal template 5 along with the print head system 2.

[0047] like Figure 3 As shown, the printing head system 2 includes a printing head system body 21, a scraper head Z-direction fixed beam 22, a forward scraper head lifting cylinder 23, a backward scraper head lifting cylinder 24, a scraper head frame 25, a scraper head Z-direction precise traction system 26, and a printing head mounting hole 27.

[0048] Furthermore, the print head mounting holes 27 are provided on both sides of the print head system body 21, the arch 9 passes through the print head mounting holes 27, and the print head system body 21 is fixed to the arch 9 by bolts. The scraper head Z-direction precision traction system 26 is fixed to the print head system body 21, and the scraper head Z-direction precision traction system 26 includes a traction motor 261, a Z-direction micro-traction ball screw 262, a Z-direction sliding guide 263, and a traction nut 264. The traction nut 264 is fixedly connected to the scraper head Z-direction fixed beam 22. The traction motor 261 drives the Z-direction micro-traction ball screw 262 to rotate through the coupling 85, thereby driving the traction nut 264 to lead the scraper head Z-direction fixed beam 22 to perform precise Z-direction up and down movement along the upper half of the Z-direction sliding guide 263.

[0049] The forward scraper head lifting cylinder 23 moves up and down in the Z direction precisely along with the scraper head Z-direction fixed crossbeam 22, and also moves up and down in the Z direction precisely along with the scraper head frame 25. As the cylinder rod of the forward scraper head lifting cylinder 23 extends and retracts, the scraper head frame 25 also moves up and down rapidly in the Z direction along the lower half of the Z-direction sliding guide rail 263.

[0050] like Figure 3 As shown, the scraper head frame 25 includes a triangular fixing frame 251, a locking bolt 252, a main scraper fixing column 253, a floating scraper hole fixing pin 254, an auxiliary scraper fixing column 255, a front scraper head group fixing beam 256, and a rear scraper head group fixing beam 257.

[0051] The angle formed between the main scraper fixing column 253 and the auxiliary scraper fixing column 255 and the front scraper head assembly fixing beam 256 does not necessarily have to be 90° and can be adjusted as needed before being locked and secured with the locking bolt 252. This ensures that the scraper 3 and the flexible metal template 5 form an adjustable solder paste printing propulsion angle, rather than the scraper 3's own scraping angle, thereby improving the thrust force for solder paste printing. The rear scraper head assembly fixing beam 257 adopts the same structure as the front scraper head assembly fixing beam 256 and is also equipped with the main scraper fixing column 253 and the auxiliary scraper fixing column 255.

[0052] like Figure 3 As shown, both the main scraper fixing column 253 and the auxiliary scraper fixing column 255 are provided with a floating scraper hole fixing pin 254, and each floating scraper hole fixing pin 254 is to be installed with a scraper 3. When printing solder paste, the scraper installed on the auxiliary scraper fixing column 255 maintains relatively loose contact with the flexible metal template 5, ensuring that there is more solder paste residue when printing solder paste, and the scraper installed on the main scraper fixing column 253 maintains relatively close contact with the flexible metal template 5, ensuring that the second solder paste printing is performed in the same printing stroke, and providing a stronger thrust to the solder paste, further pushing the solder paste into the PCB through-hole, and pushing the solder paste into the PCB through-hole twice in a single stroke through the overprinting process, thereby increasing the amount of solder paste printed in the through-hole.

[0053] The two scrapers installed on the front scraper head group fixed beam 256 push the solder paste to roll forward along the Y direction during solder paste printing; the two scrapers installed on the rear scraper head group fixed beam 257 push the solder paste to roll backward along the Y direction during solder paste printing.

[0054] like Figure 3 and 4 As shown, the scraper 3 is inserted into the floating scraper hole fixing pin 254 through the floating scraper fixing hole 31. Because it is fixed with a single fixing pin, the scraper will rotate around the floating scraper hole fixing pin 254, allowing floating adjustment of the gap between the scraper 3 and the flexible metal template 5 during solder paste printing. The scraper floating fine-tuning paddle 35 is also inserted into the floating scraper hole fixing pin 254 through the scraper floating fine-tuning paddle 35 fixing hole. Then, by adjusting the extended length of the two floating fine-tuning studs 353, the parallelism of the scraper blade 32 and the floating fine-tuning paddle body can be adjusted, ensuring the up and down floating range of the scraper 3 on the flexible metal template 5 and ensuring that the contact gap between the scraper 3 and the flexible metal template 5 is not too large. Of course, the scraper floating fine-tuning paddle 35 is an optional module, only suitable for occasions with special requirements for the gap between the scraper 3 and the flexible metal template 5.

[0055] like Figure 6The negative pressure support chamber 6 includes a negative pressure chamber 61, a sealing silicone felt 62, an exhaust hole 63, a sealing cover 64, a cylinder connector 65, a support cylinder 66, an adjustable magnetic support rod 67, an adjustable magnetic support block 68 and a slag discharge hole 69. After the PCB is introduced into the printing device through the transmission guide rail, it stops directly below the flexible metal template 5. The negative pressure chamber 61 is quickly lifted up by the support of the support cylinder 66. The adjustable magnetic support rod 67 and the adjustable magnetic support block 68 distributed inside the negative pressure chamber 61 rise together with the negative pressure chamber 61, lifting the PCB and making close contact with the flexible metal template 5. The PCB's pads and their corresponding openings on the flexible metal template 5 are completely overlapped, and the negative pressure chamber 61 and the flexible metal template 5 are formed into a closed cavity through the sealing silicone felt 62. As the scraper 3 squeezes, the flexible metal template 5 will bend and deform elastically downward, squeezing the enclosed cavity, and then exhausting the air through the exhaust hole 63. Once the exhaust is completed, the sealing cover 64 will automatically close under the action of negative pressure, thereby turning the enclosed cavity into a negative pressure cavity, creating a strong suction force on the solder paste remaining in the PCB through-hole, allowing the solder paste to further pass through the PCB through-hole, thereby increasing the vertical printing volume of the through-hole solder paste printing.

[0056] By adjusting the position and density of the adjustable magnetic support rods 67 and the adjustable magnetic support blocks 68, the pressure exerted by the scraper 3 on the PCB during solder paste printing can be evenly distributed, preventing uneven solder paste thickness during printing. Solder slag and contaminants generated during the printing process will also fall directly into the negative pressure chamber 61 and can be regularly removed through the slag discharge holes 69, preventing contamination of other parts of the printing device and promoting environmental protection.

[0057] like Figure 5 As shown, the metal template fast fixing mechanism 4 mainly includes a C-shaped steel channel 41, a locking cylinder 42, a locking rubber washer 43, a C-shaped steel channel 41 sliding guide rail, and a C-shaped steel channel 41 guide screw. The flexible metal template 5 is installed in the C-shaped steel channel 41.

[0058] The C-shaped steel groove 41 guide screw is used to pull the C-shaped steel groove 41 to slide slightly on the sliding guide rail of the C-shaped steel groove 41 to ensure that the gap between a pair of C-shaped steel grooves 41 is equal to the width of the outer frame of the flexible metal template 5. By correcting the sliding displacement of the C-shaped steel groove 41 on the sliding guide rail of the C-shaped steel groove 41, it is ensured that the soldering pads of the PCB and their corresponding openings on the flexible metal template 5 are completely overlapped. Then, the locking cylinder 42 is started, and the flexible metal template 5 is quickly pressed with the extended end of the cylinder together with the locking rubber gasket 43 located thereon to ensure that the flexible metal template 5 can be firmly fixed in the current position.

[0059] At this point, the through-hole 3D solder paste printing device is fully adjusted. To print solder paste, simply add an appropriate amount of solder paste to the flexible metal template 5, insert a blank PCB into the device, and turn it on to complete automatic printing. After printing is completed, the PCB transport device will remove the printed PCB and simultaneously import another new blank PCB. The scraper will then repeat the above process on its return stroke to complete the through-hole 3D solder paste printing. Using this device for solder paste printing, one round trip of the scraper can print two PCBs.

[0060] According to the traditional layout method of the solder paste printer, an automatic template cleaning device and a PCB automatic input and output device can be added to the negative pressure support chamber 66 and the metal template quick fixing mechanism 44. Adding these devices on the basis of this embodiment is only a reasonable extension of this embodiment.

[0061] Example 2

[0062] When performing non-through-hole solder paste printing, only the main scraper fixing column 253 can be used to install the scraper, and the auxiliary scraper fixing column 255 does not need to be installed with a scraper, so that single scraper printing of solder paste can be performed directly, thereby meeting the needs of products with low requirements on solder paste printing accuracy or non-through-hole solder paste printing.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A through-hole three-dimensional solder paste printing device, characterized in that: The printing chamber comprises a frame and a printing chamber located on the upper part of the frame, wherein the printing chamber is provided with an arch frame (9), a Y-axis precision traction system (8), a printing head system (2), a scraper (3), a metal template fast fixing mechanism (4), a flexible metal template (5) and a negative pressure support chamber (6) in order from top to bottom; The printing head system (2) is mounted and fixed on the arch (9); The arch frame (9) is mounted on the sliding guide rail above the Y-direction precision traction system (8) and moves in the Y direction along the sliding guide rail; The scraper (3) is installed below the printing head system (2); The flexible metal template (5) is installed in the groove of the metal template quick fixing mechanism (4); The negative pressure support chamber (6) is located at the bottom of the printing chamber; The negative pressure support chamber (6) comprises a negative pressure chamber (61), a sealing silicone felt (62), an exhaust hole (63), a sealing cover (64), a cylinder connector (65), a support cylinder (66), an adjustable magnetic support rod (67), an adjustable magnetic support block (68) and a slag discharge hole (69); The negative pressure chamber (61) is installed below the flexible metal template (5) through a plurality of supporting cylinders (66), and the bottom of the negative pressure chamber (61) is fixedly connected to the protruding ends of the plurality of supporting cylinders (66) through cylinder connectors (65), and the supporting cylinders (66) are fixed to the bottom of the printing chamber; the negative pressure chamber (61) forms a closed cavity with the flexible metal template (5) through the sealing silicone felt (62), and an exhaust hole (63) is provided on the negative pressure chamber (61), and a sealing cover (64) is installed on the exhaust hole (63); the adjustable magnetic support rod (67) and the adjustable magnetic support block (68) are adsorbed on the bottom of the negative pressure chamber (61) by magnetic attraction, and the slag discharge hole (69) is provided at the bottom of the negative pressure chamber (61); Wherein, under the extrusion of the scraper (3), the flexible metal template (5) will bend downward and deform elastically, squeezing the closed cavity, and then exhausting the air through the exhaust hole (63). Once the exhaust is completed, the sealing cover (64) will automatically close under the action of negative pressure, thereby turning the closed cavity into a negative pressure cavity, causing a strong suction force on the solder paste remaining in the PCB through-hole.

2. The through-hole three-dimensional solder paste printing device according to claim 1, characterized in that: A control and storage chamber (7) is provided at the lower portion of the frame (1), and a compressed gas storage tank (12) is provided in the control and storage chamber (7).

3. The through-hole three-dimensional solder paste printing device according to claim 1, characterized in that: The printing head system (2) comprises a printing head system body (21), a scraper head Z-direction fixed beam (22), a forward scraper head lifting cylinder (23), a backward scraper head lifting cylinder (24), a scraper head frame (25), a scraper head Z-direction precise traction system (26), and a printing head mounting hole (27); The printing head mounting holes (27) are opened on both sides of the printing head system body (21), the arch frame (9) passes through the printing head mounting holes (27), and the printing head system body (21) is fixed to the arch frame (9) by bolts; The scraper head Z-direction precision traction system (26) is fixed on the printing head system body (21), and the scraper head Z-direction precision traction system (26) includes a traction motor (261), a Z-direction micro-traction ball screw (262), a Z-direction sliding guide (263) and a traction nut (264), wherein the Z-direction sliding guide (263) is installed on the printing head system body (21), the Z-direction micro-traction ball screw (262) is rotatably arranged on one side of the Z-direction sliding guide (263), the traction nut (264) is threadedly connected to the outer surface of the Z-direction micro-traction ball screw (262), and the traction nut (264) is screwed to the outer surface of the Z-direction micro-traction ball screw (262), and the traction nut (264) is screwed to the outer surface of the Z-direction micro-traction ball screw (262). ) is connected to the scraper head Z-direction fixed beam (22), the traction motor (261) drives the Z-direction micro-traction ball screw (262) to rotate through the coupling, thereby driving the traction nut (264) to lead the scraper head Z-direction fixed beam (22) along the upper half of the Z-direction sliding guide rail (263) to perform precise up and down movement in the Z direction; The base ends of the forward scraper head lifting cylinder (23) and the backward scraper head lifting cylinder (24) are fixed on the scraper head Z-direction fixed beam (22), and the protruding ends are connected to the scraper head frame (25); the scraper head frame (25) moves precisely in the Z-direction up and down along the lower half of the Z-direction sliding guide rail (263).

4. The through-hole three-dimensional solder paste printing device according to claim 3, characterized in that: The scraper head frame (25) includes a triangular fixing frame (251), a locking bolt (252), a main scraper fixing column (253), a floating scraper hole fixing pin (254), an auxiliary scraper fixing column (255), a front scraper head group fixing beam (256), and a rear scraper head group fixing beam (257); The extended end of the forward scraper head lifting cylinder (23) and the front scraper head assembly fixing beam (256) are fixed via the triangular fixing frame (251); The main scraper fixing column (253) is locked and fixed with the front scraper head group fixing beam (256) via the locking bolt (252), and the auxiliary scraper fixing column (255) is locked and fixed with the scraper head group fixing beam (257); The scraper (3) is mounted on the main scraper fixing column (253) and the auxiliary scraper fixing column (255) via the floating scraper hole fixing pin (254).

5. The through-hole three-dimensional solder paste printing device according to claim 4, characterized in that: The scraper (3) comprises a floating scraper fixing hole (31), a scraper blade body (32), a metal scraper surface (33), a metal scraper surface fixing rivet (34), and a scraper floating fine-tuning paddle (35); The scraper (3) is inserted into the floating scraper hole fixing pin (254) through the floating scraper fixing hole (31), the scraper blade body (32) is located on the scraper (3), the metal scraper surface (33) is installed on the scraper blade body (32) through the metal scraper surface fixing rivet (34), and the scraper floating fine-tuning paddle (35) is installed above the scraper blade body (32).

6. The through-hole three-dimensional solder paste printing device according to claim 5, characterized in that: The scraper floating fine-tuning paddle (35) includes a scraper floating fine-tuning paddle fixing hole (351), a floating fine-tuning paddle body (352) and two floating fine-tuning studs (353), wherein the floating fine-tuning paddle body (352) is installed above the scraper blade body (32), the scraper floating fine-tuning paddle fixing hole (351) is opened in the middle of the floating fine-tuning paddle body (352), the two floating fine-tuning studs (353) are respectively threadedly connected to the two sides of the floating fine-tuning paddle body (352), and the bottoms of the two floating fine-tuning studs (353) are in contact with the upper end surface of the scraper blade body (32), and the scraper floating fine-tuning paddle fixing hole (351) and the floating scraper fixing hole (31) overlap with each other and are jointly inserted into the floating scraper hole fixing pin (254).

7. The through-hole three-dimensional solder paste printing device according to claim 1, characterized in that: The metal template quick fixing mechanism (4) includes a C-shaped steel groove (41), a locking cylinder (42), a locking rubber washer (43), a C-shaped steel groove sliding guide rail (44), and a C-shaped steel groove guide screw (45); A pair of C-shaped steel groove sliding guide rails (44) are respectively installed on both sides of the printing chamber of the frame (1), the C-shaped steel groove guide screw (45) is rotatably set inside the C-shaped steel groove sliding guide rail (44), the C-shaped steel groove (41) is slidably set on the C-shaped steel groove sliding guide rail (44), and the C-shaped steel groove (41) is threadedly connected to the C-shaped steel groove guide screw (45), the locking cylinder (42) is installed at the top of the inner side of the C-shaped steel groove (41), and the output end of the locking cylinder (42) is installed with the locking rubber gasket (43).

8. The through-hole three-dimensional solder paste printing device according to claim 1, characterized in that: The Y-axis precise traction system (8) includes a Y-axis sliding guide rail (81), a Y-axis traction ball screw (82), a guide rail support pin (83), a printing head system traction screw nut (84), a coupling (85) and a motor (86); The two Y-direction sliding guide rails (81) are fixed on both sides of the frame (1) by the guide rail support pins (83), and the arch frame (9) flies over the Y-direction sliding guide rails (81) and forms a fixed connection with the printing head system traction screw nut (84). The motor (86) drives the Y-direction traction ball screw (82) to rotate through the coupling (85), and then drives the arch frame (9) to move back and forth accurately along the Y direction through the printing head system traction screw nut (84).

9. The through-hole three-dimensional solder paste printing device according to claim 1, characterized in that: The frame (1) includes a retractable computer (10) on the outside, and four universal wheels (11) are installed on the bottom.

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