PCB steel mesh with precise alignment multi-layer structure

Abstract

The utility model relates to PCB steel net technical field discloses a kind of PCB steel nets of accurate alignment multilayer structure, including bottom plate and support, the outer wall top of support is provided with bolt one, the outer wall middle part of bolt one is connected with connecting plate one, the outer wall bottom of connecting plate one is fixedly connected with connecting block two in front and back side, the outer wall of two bolt two is fixedly connected with limit block in far side, the outer wall top of support is all set with limit slot in front and back side, the outer wall top of bottom plate is provided with steel net mechanism in middle side, and the steel net mechanism is a kind of multilayer structure PCB steel net.In the utility model, by tightening bolt one of support top side, so that pressure plate gradually falls, when pressure plate finally reaches end position, so that PCB steel net can be well fixed, to realize effective and stable fixation to PCB steel net, ensure its stability and reliability in subsequent operation.

Description

Technical Field

[0001] This utility model relates to the field of PCB stencil technology, and in particular to a PCB stencil with a precise alignment multilayer structure. Background Technology

[0002] In the field of electronics manufacturing, PCBs, as the core carriers of electronic components, directly determine the performance of end products through their assembly precision. As electronic products develop towards miniaturization and high density, the packaging forms of components on PCBs are constantly evolving, gradually transitioning from traditional DIP packaging to ultra-miniature components, BGAs, and CSPs under SMT. The pin pitch has shrunk to less than 0.3 millimeters, placing stringent requirements on solder paste printing precision. To address these issues, the industry has gradually explored multi-layer stencils, using differentiated thicknesses and mesh designs in different areas to adapt to the needs of various types of components. However, the alignment between layers of multi-layer stencils has become a new challenge. Interlayer deviations can lead to mesh misalignment, directly affecting the quality of solder paste molding. At the same time, consumer electronics, automotive electronics, and other fields have increased requirements for product reliability. For example, automotive PCBs need to withstand complex operating conditions such as high and low temperatures and vibrations. Solder paste printing defects can significantly increase the product failure rate. Therefore, developing precisely aligned multi-layer PCB stencils has become a key direction for meeting the needs of high-density PCB manufacturing and improving the quality and stability of electronic end products.

[0003] Currently, the PCB stencil alignment structure on the market mainly consists of a stencil positioning device, an alignment adjustment mechanism, and a PCB positioning device. The clamping and fixing of the stencil directly affects its tension stability. If the clamping and fixing is not firm, traditional frame-type clamping often uses pressure at the four corners or one side, resulting in a tension distribution difference of 15% to 20% at the edge of the stencil. The middle area is prone to depression due to insufficient tension. Uneven solder paste during printing makes the PCB stencil not firmly fixed, which reduces stability and seriously affects the finished product qualification rate. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a PCB stencil with a precise alignment of multiple layers, aiming to improve the problem of unstable fixing of traditional PCB stencils in the prior art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a PCB stencil with a precise alignment multi-layer structure, comprising a base plate and a support. A bolt is provided at the top of the outer wall of the support. A connecting plate is threadedly connected to the middle of the outer wall of the bolt. Connecting blocks are fixedly connected to the front and rear sides of the bottom of the outer wall of the connecting plate. Connecting plates are fixedly connected to the bottom of the outer walls of the two connecting blocks. Telescopic rods are fixedly connected to the front and rear sides of the bottom of the outer walls of the connecting plates. Pressure plates are fixedly connected to the bottom of the outer walls of the two telescopic rods. Bolts are fixedly connected to the outer walls of the two connecting blocks on opposite sides. A fixing valve is threadedly connected to the middle of the outer walls of the two bolts. Limiting blocks are fixedly connected to the outer walls of the two bolts on opposite sides. Limiting grooves are provided on the front and rear sides of the top of the outer wall of the support. A stencil mechanism is provided on the middle of the top of the outer wall of the base plate. The stencil mechanism is a multi-layer PCB stencil.

[0006] As a further description of the above technical solution: The steel mesh mechanism includes an aluminum template one, a mirror-finished stainless steel template one at the bottom of its outer wall, a prepreg sheet at the bottom of ...

[0007] As a further description of the above technical solution: The base plate is fixedly connected to the left and right sides of its outer wall, and protective pads are fixedly connected to the four corners of the top of the outer wall of the bracket.

[0008] As a further description of the above technical solution: A limit post is fixedly connected to the top center of the outer wall of the base plate, and protective strips are fixedly connected to the left and right sides of the middle of the outer wall of the bracket.

[0009] As a further description of the above technical solution: The bracket has handles fixedly connected to the top of the left and right sides of its outer wall, and protective sleeves are fixedly connected to the outer walls of the two handles.

[0010] As a further description of the above technical solution: Rubber pads are fixedly connected to the bottom front and rear sides of the outer walls of the two fixing plates, and protective sleeves are fixedly connected to the outer walls of the multiple rubber pads.

[0011] As a further description of the above technical solution: The bracket has round pads fixedly connected to the bottom front and rear sides of its outer wall, and protective strips are fixedly connected to the top middle sides of the outer walls of the two fixing plates.

[0012] As a further description of the above technical solution: Protective pads are fixedly connected to the top front and rear sides of the outer walls of the two fixed plates, and screws are threadedly connected to the top of the outer walls of the two fixed plates near the middle side.

[0013] This utility model has the following beneficial effects: 1. In this utility model, by moving the connecting plate one on the left and right sides and adjusting its position until the most suitable position is found, the pressure plate is gradually lowered by tightening the fixing valves on both sides of the bracket. During the process of the pressure plate falling, the telescopic rod will perform corresponding telescopic movements. When the pressure plate finally reaches the bottom position, this series of actions can ensure that the PCB stencil is well fixed, thereby achieving effective and stable fixing of the PCB stencil and improving the qualification rate of the finished product.

[0014] 2. In this utility model, a semi-cured sheet is firmly installed in the center of the connecting block one. The front and back of the semi-cured sheet are respectively equipped with a mirror stainless steel plate one and an aluminum template two. In order to enhance the stability and functionality of the structure, a slot is opened in the center of each of the two connecting blocks one. Its main function is to firmly fix the various components, thereby effectively realizing the complex combination of multi-layer and multi-structure PCB steel plates, ensuring the stability and reliability of the overall device. Attached Figure Description

[0015] Figure 1 A three-dimensional view of the front side of a bracket for a precisely aligned multi-layer PCB stencil structure proposed in this utility model; Figure 2 This is a partial structural diagram of the handle of a PCB stencil with a precise alignment multilayer structure proposed in this utility model; Figure 3 This is a partial structural diagram of the base plate of a PCB stencil with a precise alignment multilayer structure proposed in this utility model; Figure 4 This is a partial structural diagram of the bolts used in the precise alignment of a multi-layer PCB stencil proposed in this utility model. Figure 5 This is a partial structural diagram of an aluminum template for a multi-layer PCB stencil with precise alignment, as proposed in this utility model.

[0016] Legend: 1. Base plate; 2. Steel mesh mechanism; 201. Aluminum template one; 202. Mirror stainless steel one; 203. Prepreg; 204. Aluminum template two; 205. Mirror stainless steel two; 206. Connecting block one; 207. Fixing block one; 208. Slot; 3. Bracket; 4. Bolt one; 5. Connecting plate one; 6. Connecting block two; 7. Connecting plate two; 8. Telescopic rod; 9. Pressure plate; 10. Bolt two; 11. Fixing valve; 12. Limiting block; 13. Limiting groove; 14. Rubber pad; 15. Protective sleeve one; 16. Fixing plate; 17. Screw; 18. Protective pad one; 19. Handle; 20. Protective sleeve two; 21. Protective strip one; 22. Round pad; 23. Protective strip two; 24. Protective pad two; 25. Limiting post. 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 This utility model provides an embodiment of a multi-layer PCB stencil with precise alignment, comprising a base plate 1 and a support 3. A bolt 4 is provided on the top of the outer wall of the support 3. A connecting plate 5 is threadedly connected to the middle of the outer wall of the bolt 4. Connecting blocks 6 are fixedly connected to the front and rear sides of the bottom of the outer wall of the connecting plate 5. Connecting plates 7 are fixedly connected to the bottom of the outer walls of the two connecting blocks 6. Telescopic rods 8 are fixedly connected to the front and rear sides of the bottom of the outer walls of the connecting plates 7. Pressure plates 9 are fixedly connected to the bottom of the outer walls of the two telescopic rods 8. Bolts 10 are fixedly connected to the outer walls of the two connecting blocks 6 on opposite sides. Fixed valves 11 are threadedly connected to the middle of the outer walls of the two bolts 10. Limiting blocks 12 are fixedly connected to the outer walls of the two bolts 10 on opposite sides. Limiting grooves 13 are provided on the front and rear sides of the top of the outer wall of the support 3. A stencil mechanism 2 is provided on the middle of the top of the outer wall of the base plate 1. The stencil mechanism 2 is a multi-layer PCB stencil. Specifically, the device mainly consists of a base plate 1 and a support 3. A bolt 4 is installed at the top of the outer wall of the support 3. A connecting plate 5 is threadedly connected to the middle of the outer wall of the bolt 4. Connecting blocks 6 are securely connected to the bottom front and rear sides of the outer wall of the connecting plate 5. A connecting plate 7 is fixedly connected to the bottom of the outer wall of each of the two connecting blocks 6. Telescopic rods 8 are securely connected to the bottom front and rear sides of the bottom of the outer wall of each of the two telescopic rods 8. A pressure plate 9 is fixedly connected to the bottom of the outer wall of each of the two connecting blocks 6. Furthermore, the outer walls of the two connecting blocks 6 are far apart. Bolt 10 is fixedly connected to one side of each of the two bolts 10. A fixed valve 11 is connected to the middle of the outer wall of each bolt 10 by means of thread. A limiting block 12 is also fixedly connected to the outer wall of each of the two bolts 10 on the side that is far apart. Limiting grooves 13 are opened on the front and rear sides of the top of the outer wall of the bracket 3 to facilitate the insertion and fixing of the limiting block 12. A steel mesh mechanism 2 is set on the middle side of the top of the outer wall of the base plate 1. The steel mesh mechanism 2 adopts a multi-layer PCB steel mesh to enhance its stability and functionality. The firm connection of each component ensures the efficient operation and long-term stability of the device.

[0019] Please see the appendix Figure 2 - Appendix Figure 4 The steel mesh structure 2 includes an aluminum template 201, a mirror stainless steel 202 on the bottom of the outer wall of the aluminum template 201, a semi-cured sheet 203 on the bottom of the outer wall of the mirror stainless steel 202, an aluminum template 204 on the bottom of the outer wall of the semi-cured sheet 203, a mirror stainless steel 205 on the bottom of the outer wall of the aluminum template 204, and connecting blocks 206 fixedly connected to the left and right sides of the outer wall of the mirror stainless steel 205. Fixing blocks 207 are provided on the bottom of the inner walls of the two connecting blocks 206, and slots 208 are provided on the inner walls of the two connecting blocks 206. Specifically, the steel mesh structure 2 includes an aluminum template 201. The bottom of the outer wall of the aluminum template 201 is covered with a layer of mirror-finished stainless steel 202. A layer of prepreg 203 is installed on the bottom of the outer wall of the mirror-finished stainless steel 202 to ensure the stability and functionality of the structure. The bottom of the outer wall of the prepreg 203 is immediately followed by another aluminum template 204 to enhance the support of the overall structure. The bottom of the outer wall of the aluminum template 204 is also covered with a layer of mirror-finished stainless steel 205 to improve the smoothness and durability of the surface. In addition, connecting blocks 206 are firmly fixed to the left and right sides of the outer wall of the mirror-finished stainless steel 205 to ensure a tight fit between the components. The bottom of the inner wall of each of the two connecting blocks 206 is provided with fixing blocks 207 to enhance the stability of the connection. At the same time, the inner wall of each of the two connecting blocks 206 is also provided with a slot 208 to facilitate quick connection and disassembly with other components, thereby improving the installation efficiency and flexibility of the overall structure.

[0020] Please see the appendix Figure 1 - Appendix Figure 3 Fixing plates 16 are fixedly connected to the left and right sides of the outer wall of the base plate 1. Protective pads 24 are fixedly connected to the four corners of the top of the outer wall of the bracket 3. Limiting posts 25 are fixedly connected to the middle of the top of the outer wall of the base plate 1. Protective strips 23 are fixedly connected to the left and right sides of the middle of the outer wall of the bracket 3. Handles 19 are fixedly connected to the top of the left and right sides of the outer wall of the bracket 3. Protective sleeves 20 are fixedly connected to the outer walls of the two handles 19. Specifically, the outer walls of the base plate 1 are sturdily connected to fixed plates 16 on both sides to ensure the stability and robustness of the overall structure. Protective pads 24 are fixedly connected to the four corners of the top of the outer wall of the bracket 3. These protective pads 24 effectively prevent damage caused by collisions during use. A limiting post 25 is fixedly connected to the middle of the top of the outer wall of the base plate 1. This limiting post 25 restricts the movement range of related components, ensuring operational safety. Protective strips 23 are sturdily connected to the left and right sides of the middle of the outer wall of the bracket 3. These protective strips 23 enhance the protective performance of the bracket 3. Handles 19 are sturdily connected to the top of both sides of the outer wall of the bracket 3, facilitating gripping when moving and assembling equipment. Protective sleeves 20 are tightly connected to the outer walls of both handles 19. These protective sleeves 20 not only provide a comfortable grip but also effectively prevent hand slippage.

[0021] Please see the appendix Figure 1 - Appendix Figure 2 Rubber pads 14 are fixedly connected to the bottom front and rear sides of the outer walls of the two fixing plates 16. Protective sleeves 15 are fixedly connected to the outer walls of the multiple rubber pads 14. Round pads 22 are fixedly connected to the bottom front and rear sides of the outer walls of the bracket 3. Protective strips 21 are fixedly connected to the top middle side of the outer walls of the two fixing plates 16. Protective pads 18 are fixedly connected to the top front and rear sides of the outer walls of the two fixing plates 16. Screws 17 are threadedly connected to the top of the outer walls of the two fixing plates 16 near the middle side. Specifically, both fixing plates 16 have rubber pads 14 fixedly connected to the bottom front and rear sides of their outer walls. These rubber pads 14 are numerous, and each one is firmly fixedly connected to a protective sleeve 15 to ensure the comprehensiveness and effectiveness of its protective function. In addition, the bracket 3 has round pads 22 fixedly connected to the bottom front and rear sides of its outer walls to enhance its support and cushioning effect. Protective strips 21 are firmly fixedly connected to the top middle side of the outer walls of both fixing plates 16 to provide additional protection. At the same time, protective pads 18 are firmly fixedly connected to the top front and rear sides of the outer walls of both fixing plates 16 to improve their protective performance. Finally, screws 17 are firmly connected to the top of the outer walls of both fixing plates 16 near the middle side to ensure the stability and reliability of the overall structure.

[0022] Working principle: The connecting plate 5 is moved to the left and right sides to find the appropriate position. When the appropriate position is found, the connecting block 6 is firmly fixed in the desired position by tightening the fixing valves 11 on both sides of the bracket 3. Then, the pressure plate 9 is dropped by tightening the bolt 4. At the same time as the pressure plate 9 drops, the telescopic rod 8 will extend and retract. When it reaches the bottom, the PCB steel mesh can be well fixed, thus achieving effective fixation of the PCB steel mesh. A prepreg 203 is fixed in the middle of the connecting block 206. Mirror stainless steel 202 and aluminum template 204 are respectively provided on the front and rear sides of the prepreg 203. Aluminum template 201 is provided on the other side of mirror stainless steel 202, and mirror stainless steel 205 is provided on the other side of aluminum template 204. A slot 208 is opened in the middle of the two connecting blocks 206, and a fixing block 207 is provided in the middle of the slot 208 for fixing, thus realizing the multi-structure of the PCB steel plate.

[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. A PCB stencil with a precise alignment multilayer structure, comprising a base plate (1) and a support (3), characterized in that: The bracket (3) has a bolt (4) on the top of its outer wall. The bolt (4) is threaded with a connecting plate (5) in the middle of its outer wall. The connecting plate (5) is fixedly connected with connecting blocks (6) on the front and back sides of its outer wall. The connecting blocks (6) are fixedly connected with connecting plates (7) on the bottom of their outer walls. The connecting plates (7) are fixedly connected with telescopic rods (8) on the front and back sides of their outer walls. The telescopic rods (8) are fixedly connected with pressure plates (9) on the bottom of their outer walls. The connecting blocks (6) are fixedly connected with bolts (10) on the side of their outer walls that are far apart from each other. The connecting blocks (10) are threaded with fixed valves (11) in the middle of their outer walls. The connecting blocks (10) are fixedly connected with limit blocks (12) on the side of their outer walls that are far apart from each other. The bracket (3) has limit grooves (13) on the top of its outer wall. The base plate (1) has a steel mesh mechanism (2) on the middle side of its top. The steel mesh mechanism (2) is a multi-layer PCB steel mesh.

2. The PCB stencil with a precise alignment multilayer structure according to claim 1, characterized in that: The steel mesh mechanism (2) includes an aluminum template (201), a mirror stainless steel (202) is provided on the bottom of the outer wall of the aluminum template (201), a semi-cured sheet (203) is provided on the bottom of the outer wall of the mirror stainless steel (202), an aluminum template (204) is provided on the bottom of the outer wall of the semi-cured sheet (203), a mirror stainless steel (205) is provided on the bottom of the outer wall of the aluminum template (204), a connecting block (206) is fixedly connected to the left and right sides of the outer wall of the mirror stainless steel (205), a fixing block (207) is provided on the bottom of the inner wall of the two connecting blocks (206), and a slot (208) is provided on the inner wall of the two connecting blocks (206).

3. The PCB stencil with a precise alignment multilayer structure according to claim 1, characterized in that: The base plate (1) is fixedly connected to the left and right sides of the outer wall, and the bracket (3) is fixedly connected to the four corners of the top of the outer wall, and the bracket (3) is fixedly connected to the protective pads (24).

4. The PCB stencil with a precise alignment multilayer structure according to claim 1, characterized in that: Limiting posts (25) are fixedly connected to the top middle side of the outer wall of the base plate (1), and protective strips (23) are fixedly connected to the left and right sides of the middle part of the outer wall of the bracket (3).

5. The PCB stencil with a precise alignment multilayer structure according to claim 1, characterized in that: The top of the left and right sides of the outer wall of the bracket (3) is fixedly connected to a handle (19), and the outer walls of the two handles (19) are fixedly connected to a protective sleeve (20).

6. The PCB stencil with a precise alignment multilayer structure according to claim 3, characterized in that: Rubber pads (14) are fixedly connected to the bottom front and rear sides of the outer walls of the two fixing plates (16), and protective sleeves (15) are fixedly connected to the outer walls of the multiple rubber pads (14).

7. The PCB stencil with a precise alignment multilayer structure according to claim 3, characterized in that: The bracket (3) has round pads (22) fixedly connected to the bottom front and rear sides of the outer wall, and protective strips (21) are fixedly connected to the top middle sides of the outer walls of the two fixing plates (16).

8. The PCB stencil with a precise alignment multilayer structure according to claim 3, characterized in that: Protective pads (18) are fixedly connected to the top front and rear sides of the outer walls of the two fixing plates (16), and screws (17) are threadedly connected to the top of the outer walls of the two fixing plates (16) near the middle side.

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