Smt steel mesh for narrow pitch components

Abstract

The utility model relates to electronic manufacturing technical field discloses a kind of SMT steel net for narrow pitch component, including hollow bottom shell, the bottom four corners of hollow bottom shell are uniformly connected with bottom plate, the top left and right sides of bottom plate are uniformly connected with hollow column two, the top of bottom plate is fixedly connected with fixed shell, the inner wall sliding connection of fixed shell has connecting block, the bottom inner wall of connecting block is fixedly connected with fixed rod two, the outer wall of fixed rod two is rotatably connected with connector, the inner wall bottom of connector is fixedly connected with multiple rotating blocks, the outer wall of rotating block is fixedly connected with rotating column two.In the utility model, the pressure plate moves downward after being pressed, drives fixed rod and connecting block to descend, drives connector to rotate, rotating block rotates, reduces pressure influence, restores original shape after rotating, spring pulls back fixed rod, pressure plate rises, avoid vibration to cause equipment damage, ensure equipment operation precision.

Description

Technical Field

[0001] This utility model relates to the field of electronic manufacturing technology, and in particular to an SMT stencil for narrow-pitch components. Background Technology

[0002] SMT (Surface Mount Technology) is a core process in the electronics manufacturing industry. The core process involves mounting microelectronic components onto the surface of a PCB (Printed Circuit Board) and then fixing them by soldering. The SMT stencil is a key tool for accurately distributing solder paste in this process. It is a thin metal sheet with specific openings. After being placed on the PCB, the solder paste is pressed into the openings by a squeegee. After the stencil is removed, a certain amount of solder paste is left on the component pads of the PCB, providing a soldering medium for subsequent component mounting and reflow soldering. As electronic devices become thinner and smaller, the size of components continues to miniaturize, giving rise to narrow-pitch components, and the corresponding PCB pads are also narrower and have smaller pitches.

[0003] The application scenarios of SMT stencils for narrow-pitch components must focus on their core value and solve the problem of accurate solder paste distribution in component miniaturization and high-density assembly scenarios. All scenarios revolve around three core elements: narrow-pitch component applications, high reliability requirements, and mass production needs. Specifically, they can be divided into core assembly scenarios for miniaturized equipment, automotive electronics, industrial electronics, and aerospace and military electronics scenarios. The stable operation of existing stencils relies entirely on the vibration protection of the SMT printer, without any anti-disturbance structure designed itself, resulting in a strong dependence on external equipment. However, if the printer's shock-absorbing pads are aged or the vacuum suction force is insufficient, even if the stencil itself meets the accuracy standards, the relative displacement between the stencil and the PCB will cause the solder paste to shift in the narrow-pitch pads. Long-term vibration will cause solder joint cracking, collision between the magnetic head and the disk, and cause cold solder joints, making it easy for the solder to be misaligned. This cannot ensure the use of precision equipment, and the operating accuracy is disturbed by vibration. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an SMT stencil for narrow-pitch components, aiming to improve the problems in the prior art where long-term vibration causes welding misalignment, which cannot ensure the use of precision equipment and disrupts the operating accuracy due to vibration interference.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an SMT stencil for narrow-pitch components, comprising a hollow bottom shell, a base plate fixedly connected to each of the four corners of the bottom of the hollow bottom shell, hollow columns two fixedly connected to the top left and right sides of the base plate, a fixed shell fixedly connected to the top of the base plate, a connecting block slidably connected to the inner wall of the fixed shell, a fixed rod two fixedly connected to the bottom inner wall of the connecting block, a connector rotatably connected to the outer wall of the fixed rod two, multiple rotating blocks fixedly connected to the bottom inner wall of the connector, a rotating column two fixedly connected to the outer wall of the rotating block, a circular piece fixedly connected to the right end of the rotating column two, a telescopic column fixedly connected to the top inner wall of the connecting block, a fixed rod one slidably connected to the inner wall of the telescopic column, a spring two slidably connected to the inner wall of the fixed rod one, a pressure reducing plate fixedly connected to the top of the fixed rod one, and a fixing mechanism provided on the top inner wall of the hollow bottom shell for auxiliary fixing of the hollow bottom shell.

[0006] As a further description of the above technical solution: The fixing mechanism includes a sliding plate, the top of which is slidably connected to the inner wall of the hollow bottom shell. Hollow columns are fixedly connected to the left and right sides of the top of the sliding plate. A spring is fixedly connected to the inner wall of each hollow column. A fixed top shell is fixedly connected to the top of each spring. A pressing plate is slidably connected to the inner wall of the fixed top shell. A threaded rod is fixedly connected to the top of the pressing plate. A rotating column is threadedly connected to the outer wall of the threaded rod. A worm gear is fixedly connected to the outer wall of the rotating column. A worm is meshed with the outer wall of the worm gear. A rotating rod is fixedly connected to the inner wall of the worm. A knob is fixedly connected to the outer wall of the rotating rod.

[0007] As a further description of the above technical solution: The fixed top shell has sliding grooves on both the left and right sides of its top, and sliding rods are slidably connected to the inner walls of the sliding grooves.

[0008] As a further description of the above technical solution: A hook is fixedly connected to the right side of the hollow bottom shell, and a ring is provided on the outer wall of the hook.

[0009] As a further description of the above technical solution: A movable block is slidably connected to the outer wall of the groove, and a carving pen is fixedly connected to the bottom of the movable block.

[0010] As a further description of the above technical solution: The hollow bottom shell has support columns fixedly connected to the four corners, and rubber pads are fixedly connected to the bottom of the support columns.

[0011] As a further description of the above technical solution: A nameplate is fixedly connected to the right side of the fixed top shell, and threaded pins are threaded to the four corners of the nameplate.

[0012] As a further description of the above technical solution: The outer wall of the rotating column 2 is rotatably connected to the inner wall of the base plate, and the top end of the outer wall of the spring 2 is fixedly connected to the top end of the inner wall of the telescopic column.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the pressure reducing plate moves downward after being pressed, pushing the first fixed rod and the connecting block to descend, causing the connector to rotate, and the rotating block to rotate accordingly, reducing the impact of pressure. The lower end of the disc is heavy, and after rotation, it returns to its original shape. The second spring pulls back the first fixed rod, and the pressure reducing plate rises. This avoids the cracking of solder joints, collision of the magnetic head with the disk, and misalignment of the lens caused by severe vibration, ensuring that the use and operation accuracy of precision equipment are not affected by vibration.

[0014] 2. In this utility model, rotating the knob drives the worm gear to rotate, and the rotating column rotates to connect the threaded rod. The threaded rod descends and squeezes the extrusion plate to squeeze it onto the steel mesh to achieve the fixing effect. This avoids the situation where the solder paste in the opening of the steel mesh cannot be completely transferred to the solder pad due to the existence of gaps, and ensures that each solder pad obtains a uniform and sufficient amount of solder paste, laying the foundation for reliable welding. Attached Figure Description

[0015] Figure 1 A perspective view of the front side of the hollow bottom shell of an SMT stencil for narrow-pitch components proposed in this utility model. Figure 2 This is a side view of the nameplate of an SMT stencil for narrow-pitch components proposed in this utility model; Figure 3 This is a partial structural diagram of a sliding plate for an SMT stencil used for narrow-pitch components, as proposed in this utility model. Figure 4 This is a partial structural diagram of a pressure-reducing plate for an SMT stencil used for narrow-pitch components, as proposed in this utility model. Figure 5 This is a partial structural exploded view of a fixing shell for an SMT stencil used for narrow-pitch components, as proposed in this utility model. Figure 6 This is a partial structural diagram of a telescopic column for SMT stencils used for narrow-pitch components, as proposed in this utility model.

[0016] Legend: 1. Hollow bottom shell; 2. Fixing mechanism; 201. Sliding plate; 202. Hollow column one; 203. Spring one; 204. Fixed top shell; 205. Extrusion plate; 206. Threaded rod; 207. Rotating column one; 208. Worm gear; 209. Worm; 210. Rotating rod; 211. Knob; 3. Pressure reducing plate; 4. Hollow column two; 5. Fixed shell; 6. Base plate; 7. Rotating column two; 8. Circular piece; 9. Telescopic column; 10. Fixed rod one; 11. Spring two; 12. Fixed rod two; 13. Connector; 14. Rotating block; 15. Slide groove; 16. Sliding rod; 17. Moving block; 18. Engraving pen; 19. Nameplate; 20. Threaded nail; 21. Hook; 22. Ring; 23. Support column; 24. Rubber pad; 25. Connecting block. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see the appendix Figure 4 Appendix Figure 5 and attached Figure 6 This utility model provides an embodiment of an SMT stencil for narrow-pitch components, comprising a hollow bottom shell 1, with a base plate 6 fixedly connected to each of the four corners of the bottom of the hollow bottom shell 1, hollow columns 4 fixedly connected to the left and right sides of the top of the base plate 6, a fixed shell 5 fixedly connected to the top of the base plate 6, a connecting block 25 slidably connected to the inner wall of the fixed shell 5, a fixed rod 12 fixedly connected to the bottom inner wall of the connecting block 25, a connector 13 rotatably connected to the outer wall of the fixed rod 12, and multiple rotating blocks 14 fixedly connected to the bottom of the inner wall of the connector 13. A rotating column 2 7 is fixedly connected, and a circular piece 8 is fixedly connected to the right end of the rotating column 2 7. A telescopic column 9 is fixedly connected to the top of the inner wall of the connecting block 25. A fixed rod 10 is slidably connected to the inner wall of the telescopic column 9. A spring 2 11 is slidably connected to the inner wall of the fixed rod 10. A pressure reducing plate 3 is fixedly connected to the top of the fixed rod 10. A fixing mechanism 2 is provided on the top of the inner wall of the hollow bottom shell 1. The fixing mechanism 2 is used to assist in fixing the hollow bottom shell 1. The outer wall of the rotating column 2 7 is rotatably connected to the inner wall of the bottom plate 6. The top of the outer wall of the spring 2 11 is fixedly connected to the top of the inner wall of the telescopic column 9. Specifically, the hollow bottom shell 1 is fixedly connected to the base plate 6, providing a solid supporting foundation. The base plate 6 is fixedly connected to the hollow column 4, further enhancing the stability and load-bearing capacity of the overall structure. The fixed shell 5 is slidably connected to the connecting block 25, ensuring smooth and unobstructed sliding. The connector 13 is rotatably connected to the fixed rod 12, enabling flexible and unimpeded rotation. The connector 13 is fixedly connected to the rotating block 14, ensuring its full functionality. The rotating block 14 is fixedly connected to the rotating column 7, ensuring stability and precision during rotation and avoiding deviations and vibrations. The rotating column 7 is fixedly connected to the circular piece 8, playing a crucial supporting and positioning role in the overall structure and ensuring coordination between the components. In operation, spring 11 is slidably connected to fixed rod 10, ensuring good flexibility and cushioning capacity of the entire structure during movement. Fixed rod 10 is fixedly connected to pressure relief plate 3, playing a key role in pressure reduction and stress dispersion, improving the durability and stability of the structure. The inner wall of the hollow bottom shell 1 is equipped with a fixing mechanism 2, mainly used for auxiliary fixing, further improving the stability and reliability of the overall structure, ensuring excellent performance in various usage environments. Rotating column 7 is rotatably connected to the base plate 6, ensuring flexible and smooth rotation, improving the dynamic performance of the overall structure. Spring 11 is fixedly connected to telescopic column 9, ensuring stability and reliability during long-term use.

[0019] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 3 The fixing mechanism 2 includes a sliding plate 201. The top of the sliding plate 201 is slidably connected to the inner wall of the hollow bottom shell 1. Hollow columns 202 are fixedly connected to the left and right sides of the top of the sliding plate 201. Springs 203 are fixedly connected to the inner wall of the hollow columns 202. A fixed top shell 204 is fixedly connected to the top of the springs 203. A pressing plate 205 is slidably connected to the inner wall of the fixed top shell 204. A threaded rod 206 is fixedly connected to the top of the pressing plate 205. A rotating column 207 is threadedly connected to the outer wall of the threaded rod 206. A worm gear 208 is fixedly connected to the outer wall of the rotating column 207. A worm 209 is meshed with the outer wall of the worm gear 208. A rotating rod 210 is fixedly connected to the inner wall of the worm 209. A knob 211 is fixedly connected to the outer wall of the rotating rod 210. A nameplate 19 is fixedly connected to the right side of the fixed top shell 204. Threaded nails 20 are threadedly connected to the four corners of the nameplate 19. Specifically, the sliding plate 201 is slidably connected to the hollow bottom shell 1, ensuring flexible movement and strong stability during use. The spring 203 is fixedly connected to the fixed top shell 204, ensuring the overall structural stability. The fixed top shell 204 is slidably connected to the extrusion plate 205, ensuring both flexibility and reliability during movement. The threaded rod 206 is threadedly connected to the rotating column 207, ensuring not only the firmness between the two but also facilitating subsequent disassembly and maintenance. The rotating column 207 is fixedly connected to the worm gear 208, ensuring that no loosening occurs during operation. The meshing connection between the worm gear 208 and the worm 209 not only ensures the smoothness of the process but also significantly improves efficiency and reduces energy loss. The worm 209 is fixedly connected to the rotating rod 210, ensuring the connection strength between the two and preventing loosening even under high-intensity use. The rotating rod 210 is fixedly connected to the knob 211, making operation convenient during use. The fixed top shell 204 is fixedly connected to the nameplate 19, ensuring the stability of the structure. The nameplate 19 is threadedly connected to the threaded nail 20, ensuring that it can provide sufficient tightening force during installation.

[0020] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 3 The top of the fixed top shell 204 is provided with sliding grooves 15 on both the left and right sides. A sliding rod 16 is slidably connected to the inner wall of the sliding groove 15, and a moving block 17 is slidably connected to the outer wall of the sliding groove 15. A pen 18 is fixedly connected to the bottom of the moving block 17. Specifically, the slide groove 15 is slidably connected to the sliding rod 16 to achieve a smooth and stable sliding connection, and the moving block 17 is fixedly connected to the engraving pen 18 to ensure the operational accuracy and stability of the entire device.

[0021] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 3 A hook 21 is fixedly connected to the right side of the hollow bottom shell 1. A ring 22 is provided on the outer wall of the hook 21. Support columns 23 are fixedly connected to the four corners of the bottom of the hollow bottom shell 1. Rubber pads 24 are fixedly connected to the bottom of the support columns 23. Specifically, the hollow bottom shell 1 is fixedly connected to the hook 21 to ensure that it will not loosen during use. The outer wall of the hook 21 is provided with a ring 22, which not only enhances stability but also makes it convenient for users to hang various items when needed. The hollow bottom shell 1 is fixedly connected to the support column 23, which can effectively distribute and bear the weight of the entire device, ensuring the stability and durability of the overall structure. The support column 23 is fixedly connected to the rubber pad 24, which can provide good friction in various ground environments and prevent the device from sliding.

[0022] Working principle: When the pressure reducing plate 3 is subjected to pressure, it moves downward, squeezing the fixed rod 10 to slide on the inner wall of the telescopic column 9. This pushes the connecting block 25 down, causing the fixed rod 12 to push the connector 13 to rotate. The connector 13 presses down, causing the rotating block 14 to connect the rotating column 7 to rotate, reducing the impact of pressure. Because the lower end of the disc 8 is heavy, it returns to its original shape after rotating due to inertia. The spring 11 pulls back the fixed rod 10, thus causing the pressure reducing plate 3 to rise and return to its original shape, achieving the purpose of shock absorption. This avoids the cracking of solder joints, magnetic head collision with the disk, and lens misalignment caused by severe vibration, ensuring that the use and operation accuracy of precision equipment are not affected by vibration. The stencil is pushed in through the gap between the fixed top shell 204 and the sliding plate 201. The knob 211 is turned to drive the rotating rod 210 to rotate, which causes the worm gear 209 to drive the worm wheel 208 to rotate. The rotating column 207 rotates and connects to the threaded rod 206. The threaded rod 206 descends and squeezes the extrusion plate 205 to squeeze it onto the stencil to complete the fixing effect. This avoids the solder paste in the opening of the stencil from not being completely transferred to the solder pad due to the existence of gaps, ensuring that each solder pad receives a uniform and sufficient amount of solder paste, laying the foundation for reliable welding.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An SMT stencil for narrow-pitch components, comprising a hollow base shell (1), characterized in that: A base plate (6) is fixedly connected to each of the four corners of the bottom of the hollow bottom shell (1). Hollow columns (4) are fixedly connected to the top left and right sides of the base plate (6). A fixed shell (5) is fixedly connected to the top of the base plate (6). A connecting block (25) is slidably connected to the inner wall of the fixed shell (5). A fixed rod (12) is fixedly connected to the bottom inner wall of the connecting block (25). A connector (13) is rotatably connected to the outer wall of the fixed rod (12). Multiple rotating blocks (14) are fixedly connected to the bottom of the inner wall of the connector (13). The outer wall of the hollow bottom shell (1) is fixedly connected to a rotating column 2 (7), and a circular piece (8) is fixedly connected to the right end of the rotating column 2 (7). The top of the inner wall of the connecting block (25) is fixedly connected to a telescopic column (9), and a fixed rod 1 (10) is slidably connected to the inner wall of the telescopic column (9). A spring 2 (11) is slidably connected to the inner wall of the fixed rod 1 (10). A pressure reducing plate (3) is fixedly connected to the top of the fixed rod 1 (10). A fixing mechanism (2) is provided on the top of the inner wall of the hollow bottom shell (1). The fixing mechanism (2) is used to assist in fixing the hollow bottom shell (1).

2. The SMT stencil for narrow-pitch components according to claim 1, characterized in that: The fixing mechanism (2) includes a sliding plate (201), the top of which is slidably connected to the inner wall of the hollow bottom shell (1). Hollow columns (202) are fixedly connected to the left and right sides of the top of the sliding plate (201). Springs (203) are fixedly connected to the inner wall of the hollow columns (202). A fixed top shell (204) is fixedly connected to the top of the springs (203). A pressing plate (204) is slidably connected to the inner wall of the fixed top shell (204). 5) A threaded rod (206) is fixedly connected to the top of the extrusion plate (205). A rotating column (207) is threadedly connected to the outer wall of the threaded rod (206). A worm wheel (208) is fixedly connected to the outer wall of the rotating column (207). A worm (209) is meshed with the outer wall of the worm wheel (208). A rotating rod (210) is fixedly connected to the inner wall of the worm (209). A knob (211) is fixedly connected to the outer wall of the rotating rod (210).

3. The SMT stencil for narrow-pitch components according to claim 2, characterized in that: The top left and right sides of the fixed top shell (204) are provided with sliding grooves (15), and the inner wall of the sliding groove (15) is slidably connected with a sliding rod (16).

4. The SMT stencil for narrow-pitch components according to claim 1, characterized in that: A hook (21) is fixedly connected to the right side of the hollow bottom shell (1), and a ring (22) is provided on the outer wall of the hook (21).

5. An SMT stencil for narrow-pitch components according to claim 3, characterized in that: The outer wall of the groove (15) is slidably connected to a moving block (17), and the bottom of the moving block (17) is fixedly connected to a pen (18).

6. An SMT stencil for narrow-pitch components according to claim 1, characterized in that: The hollow bottom shell (1) has four corners at the bottom of which a support column (23) is fixedly connected, and the bottom of the support column (23) is fixedly connected with a rubber pad (24).

7. An SMT stencil for narrow-pitch components according to claim 2, characterized in that: A nameplate (19) is fixedly connected to the right side of the fixed top shell (204), and threaded nails (20) are threadedly connected to the four corners of the nameplate (19).

8. An SMT stencil for narrow-pitch components according to claim 1, characterized in that: The outer wall of the rotating column 2 (7) is rotatably connected to the inner wall of the base plate (6), and the top of the outer wall of the spring 2 (11) is fixedly connected to the top of the inner wall of the telescopic column (9).

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