Steel mesh structure

Abstract

This utility model discloses a steel mesh structure, relating to the field of printing technology. The steel mesh structure includes an outer shell, a steel mesh body, and an elastic element. The outer shell has a first opening, and the steel mesh body is movably covered by the first opening. The steel mesh body has printing holes communicating with the first opening. The elastic element is disposed between the outer shell and the steel mesh body, and is used to abut against the steel mesh body. The technical solution provided by this utility model improves the tension of the steel mesh structure, thereby improving printing quality.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, and in particular to a steel mesh structure. Background Technology

[0002] In the surface mount technology manufacturing process, the stencil structure is a key tool for accurately printing solder paste onto the circuit board pads. However, the tension of the stencil structure is one of the important factors affecting the printing quality.

[0003] Existing stencil structures are usually one-piece structures. While this structure can enable solder paste printing, it lacks sufficient tension to ensure that the stencil maintains its original flatness and shape during long-term use. Consequently, it cannot guarantee that the stencil and the circuit board are fully bonded, affecting the consistency of solder paste thickness. Utility Model Content

[0004] The main purpose of this invention is to propose a steel mesh structure that aims to improve the tension of the steel mesh structure, thereby improving printing quality.

[0005] To achieve the above objectives, the steel mesh structure proposed in this utility model includes:

[0006] The outer casing has a first opening;

[0007] A steel mesh body, movably covering the first opening, the steel mesh body having printed holes communicating with the first opening; and,

[0008] An elastic element is disposed between the outer shell and the steel mesh body, and the elastic element is used to abut against the steel mesh body.

[0009] In one embodiment, the elastic element is configured as an elastic plunger, and a mounting hole is provided on the outer periphery of the first opening. One end of the elastic plunger is fixed in the mounting hole, and the end of the elastic plunger facing the steel mesh body is exposed in the mounting hole to abut against the steel mesh body.

[0010] In one embodiment, the steel mesh structure further includes:

[0011] A connector that connects the steel mesh body and the outer shell.

[0012] In one embodiment, the connector includes a spring and a fastener, with both ends of the spring connected to the steel mesh body and the outer shell respectively via the fastener.

[0013] In one embodiment, a limiting ring protrudes from the periphery of the outer shell, and the limiting ring encloses a mounting groove that communicates with the first opening, and the steel mesh body is disposed in the mounting groove.

[0014] In one embodiment, the steel mesh structure further includes:

[0015] A pressure strip is connected to the limiting ring platform. The pressure strip and the elastic element are located on opposite sides of the steel mesh body to limit the steel mesh body.

[0016] In one embodiment, the limiting ring platform is provided with a set screw hole that communicates with the mounting groove.

[0017] In one embodiment, the steel mesh body has at least one step, and the printed holes are disposed on the step.

[0018] In one embodiment, the step includes:

[0019] The second opening connects the first opening to the printed hole;

[0020] A mounting ring is provided, protruding from one side of the second opening and disposed along the periphery of the second opening; and,

[0021] A support piece is disposed at the bottom of the second opening via the mounting ring platform, and the printed hole is disposed on the support piece.

[0022] In one embodiment, the support sheet is configured as a steel sheet, and the printed hole penetrates the steel sheet.

[0023] This invention provides a stencil structure comprising an outer shell, a stencil body, and an elastic element. The outer shell has a first opening, and the stencil body movably covers this opening, with printing holes communicating with the first opening. The elastic element is positioned between the outer shell and the stencil body, abutting against the stencil body. Compared to existing integrated stencil structures, this invention separates the outer shell and the stencil body, with an elastic element between them. This elastic element provides movement space for the stencil body, increasing the tension of the stencil structure. During printing, the stencil body remains in contact with the elastic element. Under external force, the stencil body can move vertically relative to the outer shell, while the elastic element applies a counterforce, ensuring the stability of the stencil body and allowing it to fully adhere to the circuit board. This ensures consistent solder paste thickness and improves printing quality. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of an embodiment of the steel mesh structure provided by this utility model;

[0026] Figure 2 for Figure 1 A cross-sectional view of one embodiment;

[0027] Figure 3 for Figure 2 An enlarged view of an embodiment at point A;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of an embodiment from another perspective;

[0029] Figure 5 for Figure 1 A schematic diagram of the structure of one embodiment of the inner shell;

[0030] Figure 6 for Figure 1 A partially exploded view of one embodiment of the main body of China Steel Network.

[0031] Explanation of icon numbers:

[0032] 100. Outer shell; 110. First opening; 120. Mounting hole; 130. Limiting ring platform; 131. Set screw hole;

[0033] 200. Steel mesh body; 210. Printing hole; 220. Step; 221. Second opening; 222. Mounting ring platform; 223. Support plate;

[0034] 300. Elastic plunger;

[0035] 410. Spring clip; 420. Fastener;

[0036] 500, pressure strip.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] 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 scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] In the surface mount technology manufacturing process, the stencil structure is a key tool for accurately printing solder paste onto the circuit board pads. However, the tension of the stencil structure is one of the important factors affecting the printing quality.

[0042] Existing stencil structures are usually one-piece structures. While this structure can enable solder paste printing, it lacks sufficient tension to ensure that the stencil maintains its original flatness and shape during long-term use. Consequently, it cannot guarantee that the stencil and the circuit board are fully bonded, affecting the consistency of solder paste thickness.

[0043] This invention proposes a steel mesh structure to improve the tension of the steel mesh structure, thereby improving printing quality.

[0044] Please see Figure 1 and Figure 2 In one embodiment, the steel mesh structure includes a shell 100, a steel mesh body 200, and an elastic element. The shell 100 is provided with a first opening 110. The steel mesh body 200 is movably covered by the first opening 110 and is provided with a printed hole 210 communicating with the first opening 110. The elastic element is provided between the shell 100 and the steel mesh body 200 and is used to abut against the steel mesh body 200.

[0045] The outer shell 100 provides support for the steel mesh structure. In one embodiment, the outer shell 100 is a plate-like structure, with a first opening 110 formed by a cutout in the center. In one embodiment, both the outer shell 100 and the first opening 110 are rectangular. Of course, in other embodiments, the shapes of the outer shell 100 and the first opening 110 can also be circular or polygonal, etc., and are not limited here. The dimensions of the outer shell 100 and the first opening 110 can be flexibly set according to actual needs, and are not limited here.

[0046] The stencil body 200 is used to hold solder paste, and the printing holes 210 correspond to the positions of the solder pads on the circuit board. During printing, a squeegee is used to squeeze the solder paste through the printing holes 210 to the positions of the solder pads on the circuit board. The thickness of the printed solder paste is consistent with the depth of the printing holes 210. In one embodiment, the stencil body 200 covers the bottom of the first opening 110, and the solder paste is placed on the stencil body 200 through the first opening 110. The printing holes 210 connect the positions of the solder pads and the first opening 110. In one embodiment, the thickness of the stencil body 200 is between 4mm and 20mm, which facilitates processing while ensuring that the stencil body 200 is not easily deformed. Here, no specific limitation is made on the thickness of the stencil body 200. The material of the stencil body 200 can be stainless steel or electroformed nickel, which have good corrosion resistance and strength. Here, no limitation is made. In one embodiment, multiple printed holes 210 are provided, each corresponding to a different pad position, and all printed holes 210 connect the first opening 110 to the corresponding pad position. Of course, in other embodiments, only one printed hole 210 may be provided, and this is not a limitation.

[0047] The elastic element provides movement space for the steel mesh body 200. In one embodiment, the elastic element is located on the side of the steel mesh body 200 facing the first opening 110, with one end fixed to the outer shell 100 and the other end abutting against the steel mesh body 200. In one embodiment, the size of the steel mesh body 200 is larger than the size of the first opening 110, so that the steel mesh body 200 can abut against the elastic element while completely covering the first opening 110. The size of the steel mesh body 200 can be flexibly set according to the size of the first opening 110 and actual conditions, and is not limited here. Thus, because the elastic element has elastic deformation capability, when the steel mesh body 200 compresses the elastic element, the elastic element will deform, facilitating the vertical movement of the steel mesh body 200 relative to the outer shell 100; and since the elastic element is not connected to the steel mesh body 200, it does not bear the weight of the steel mesh body 200, thereby preventing fatigue and loss of elasticity, and improving stability while increasing tension.

[0048] The technical solution of this utility model involves setting an outer shell 100, a steel mesh body 200, and an elastic element within a steel mesh structure. The outer shell 100 has a first opening 110, and the steel mesh body 200 is movably covered by the first opening 110. The steel mesh body 200 has a printed hole 210 communicating with the first opening 110. The elastic element is located between the outer shell 100 and the steel mesh body 200, and is used to abut against the steel mesh body 200. Compared to the integrated steel mesh structure in the prior art, the technical solution of this utility model sets the outer shell 100 and the steel mesh body 200 separately, and sets the elastic element between the two. The elastic element can provide movement space for the steel mesh body 200, thereby improving the tension of the steel mesh structure. During the printing process, the stencil body 200 is always in contact with the elastic element. Under the action of external force, the stencil body 200 can move relative to the outer shell 100 in the vertical direction. The elastic element gives the stencil body 200 the opposite force, which ensures the stability of the stencil body 200 and makes the stencil body 200 completely adhere to the circuit board, ensuring the consistency of the printed solder paste thickness and thus improving the printing quality.

[0049] Please see Figure 2 and Figure 3 In one embodiment, the elastic element is configured as an elastic plunger 300. The outer periphery of the first opening 110 is provided with a mounting hole 120. One end of the elastic plunger 300 is fixed in the mounting hole 120 and the other end of the elastic plunger 300 facing the steel mesh body 200 is exposed in the mounting hole 120 to abut against the steel mesh body 200.

[0050] In one embodiment, a mounting hole 120 is provided on each of the four sides of the outer casing 100. All mounting holes 120 are arranged around the periphery of the first opening 110, and an elastic plunger 300 is provided in each mounting hole 120. In one embodiment, the inner wall of the mounting hole 120 is threaded, and the outer wall of the elastic plunger 300 is correspondingly threaded. One end of the elastic plunger 300 is fixed in the mounting hole 120 by the thread, and the other end of the elastic plunger 300 is exposed in the mounting hole 120 to abut against the steel mesh body 200. Of course, in other embodiments, there may be two or six mounting holes, and the elastic plungers 300 are arranged accordingly. There is no limitation here. The material of the elastic plunger 300 can be rubber, polyurethane shape memory alloy, or other materials with high elasticity. There is no limitation here. Of course, in other embodiments, the elastic element may also be an elastic block, etc., and the elastic element may be directly fixed to the outer periphery of the first opening 110. There is no limitation here.

[0051] The technical solution of this utility model embodiment, by setting an elastic plunger 300, provides movement space for the steel mesh body 200 through the elastic deformation of the elastic plunger 300, thereby increasing the tension of the steel mesh body 200. Furthermore, the elastic plunger 300 abuts against the steel mesh body 200, providing support for the steel mesh body 200 and improving its stability.

[0052] Please see Figure 4 In one embodiment, the steel mesh structure further includes a connector that connects the steel mesh body 200 and the outer shell 100.

[0053] Specifically, in one embodiment, the connector includes a spring plate 410 and a fastener 420. The two ends of the spring plate 410 are respectively connected to the steel mesh body 200 and the outer shell 100 via the fastener 420. In one embodiment, the connector is located on the side of the steel mesh body 200 facing away from the first opening 110 to avoid affecting the use of the steel mesh body 200. Specifically, in one embodiment, both ends of the spring plate 410 are provided with through holes, and the bottom of the steel mesh body 200 and the bottom of the outer shell 100 are provided with mounting holes. The fastener 420 passes through the through holes and mounting holes in sequence to fix both ends of the spring plate 410 to the steel mesh body 200 and the outer shell 100 respectively, thus connecting the spring plate 410 to the steel mesh body 200 and the outer shell 100. The fastener 420 can be a screw or rivet, etc., and the material of the spring plate 410 can be spring steel, aluminum alloy, or shape memory alloy, etc., which have good elasticity and strength; no limitation is made here. Of course, in other embodiments, the connector can also be configured as an elastic pin, etc.; no limitation is made here.

[0054] The technical solution of this utility model embodiment ensures the consistency of the positions of the steel mesh body 200 and the outer shell 100 by setting a connector to connect them. By setting the connector as a spring piece 410, the steel mesh body 200 is allowed to move vertically relative to the outer shell 100 when the elastic plunger 300 is compressed, thus ensuring the tension of the steel mesh structure.

[0055] Please see Figures 3 to 5 In one embodiment, a limiting ring platform 130 is provided on the periphery of the outer shell 100, and the limiting ring platform 130 surrounds and forms an installation groove that communicates with the first opening 110. The steel mesh body 200 is disposed in the installation groove.

[0056] In one embodiment, the mounting hole 120 communicates with the mounting groove, and one end of the elastic plunger 300 exposed in the mounting hole 120 extends into the mounting groove to abut against the steel mesh body 200. In another embodiment, the outer shell 100 and the limiting ring platform 130 are integrally formed, one end of the spring piece 410 is fixed to the steel mesh body 200, and the other end of the spring piece 410 is fixed to the limiting ring platform 130. Of course, in other embodiments, the outer shell 100 and the limiting ring platform 130 can also be connected by screwing or bonding, etc., which is not limited here. In one embodiment, the size of the mounting groove opening is larger than the size of the first opening 110 to ensure that the steel mesh body 200 can completely cover the first opening 110; and the size of the mounting groove is slightly larger than the size of the steel mesh body 200 to facilitate the vertical movement of the steel mesh body 200 relative to the limiting ring platform 130 and avoid frictional resistance between the side wall of the mounting groove and the steel mesh body 200. In another embodiment, the size of the mounting groove can also be adapted to the size of the steel mesh body 200, so that the sidewall of the mounting groove fits snugly against the steel mesh body 200. The sidewall of the mounting groove can be smoothed to reduce frictional resistance. Of course, in other embodiments, the size of the mounting groove can be flexibly set according to the size of the steel mesh body 200 and the first opening 110, and there is no limitation here.

[0057] Please see Figure 3 and Figure 5 In one embodiment, the steel mesh structure further includes pressure strips 500 connected to the limiting ring platform 130. The pressure strips 500 and the elastic element are located on opposite sides of the steel mesh body 200 to limit the steel mesh body 200. In one embodiment, two pressure strips 500 are provided, located at opposite ends along the length of the steel mesh body 200, and both are located on the side of the steel mesh body 200 away from the elastic plunger 300. The pressure strips 500 are fixed to the limiting ring platform 130, and a portion of the pressure strips 500 covers the opening of the mounting groove to abut against the steel mesh body 200. Of course, in other embodiments, one or more pressure strips 500 may be provided, which is not limited here.

[0058] The technical solution of this utility model embodiment, by setting the limiting ring platform 130 and the pressure strip 500, can restrict the steel mesh body 200 on the outer shell 100; and the pressure strip 500 cooperates with the elastic plunger 300 to ensure the realization of the tension of the steel mesh body 200. At the same time, the pressure strip 500 and the elastic plunger 300 can also provide support for the steel mesh body 200, thereby improving the stability of the steel mesh structure.

[0059] Please see Figure 5In one embodiment, the limiting ring platform 130 is provided with a set screw hole 131 communicating with the mounting groove for installing a set screw. In another embodiment, the set screw hole 131 penetrates the side wall of the mounting groove, and there are two set screw holes 131, which are spaced apart on the same side of the limiting ring platform 130. Of course, in other embodiments, one or more set screw holes 131 may be provided, and there is no limitation here. In this way, when the position of the steel mesh body 200 is offset relative to the outer shell 100, the set screw can extend into the mounting groove through the set screw hole 131 to abut against the steel mesh body 200, thereby driving the steel mesh body 200 to move relative to the outer shell 100 and reset it, thus improving the reliability of the steel mesh structure.

[0060] Please see Figure 4 and Figure 6 The main body of the steel mesh 200 has at least one step 220, and the printing hole 210 is provided on the step 220.

[0061] In one embodiment, the solder paste on the stencil body 200 is mainly concentrated on step 220, and the extension direction of step 220 is consistent with the movement direction of the squeegee. In one embodiment, there are two steps 220, which are arranged in parallel and spaced apart, and each step 220 is provided with a printing hole 210. Specifically, in one embodiment, each step 220 includes a second opening 221, a mounting ring 222, and a support piece 223. The second opening 221 connects the first opening 110 and the printing hole 210; the mounting ring 222 protrudes from one side of the second opening 221 and is arranged along the periphery of the second opening 221; the support piece 223 covers the bottom of the second opening 221 through the mounting ring 222, and the printing hole 210 is located on the support piece 223. Thus, during printing, the squeegee extends into the step 220 through the second opening 221 and one end of the squeegee abuts against the support plate 223. The squeegee moves relative to the step 220 to squeeze the solder paste through the printing hole 210 to the pad position of the circuit board.

[0062] Specifically, in one embodiment, the extension direction of the second opening 221 is consistent with the moving direction of the scraper, ensuring that the scraper can move along the second opening 221. The width of the second opening 221 is adapted to the width of the scraper, allowing the scraper to pass through the second opening 221 and abut against the support plate 223. The specific width of the second opening 221 can be flexibly set according to the size of the scraper and the actual situation, and is not limited here. In one embodiment, the support plate 223 is tightly fitted to the side of the mounting ring platform 222 away from the first opening 110 and completely covers the second opening 221. In one embodiment, the support plate 223, the mounting ring platform 222, and the steel mesh body 200 are integrally formed to ensure the tightness and stability of the overall structure of the step 220. Of course, in other embodiments, the mounting ring platform 222 and the steel mesh body 200, as well as the mounting ring platform 222 and the support plate 223, can also be connected by welding or bonding, and is not limited here. In one embodiment, the support sheet 223 is configured as a steel sheet, with the printing hole 210 penetrating through it. The thickness of the steel sheet is consistent with the depth of the printing hole 210, meaning the thickness of the steel sheet determines the thickness of the printed solder paste. In one embodiment, the thickness of the steel sheet is approximately 0.05 mm, ensuring that the thickness of the printed solder paste is approximately 0.05 mm, achieving high-precision processing. Of course, in other embodiments, the support sheet 223 can also be made of materials such as aluminum alloy or electroformed nickel, and the thickness of the support sheet 223 can be flexibly set according to actual needs. Therefore, the material and thickness of the support sheet 223 are not limited here. Similarly, in other embodiments, one or more steps 220 may be provided; this is not limited here.

[0063] The technical solution of this utility model embodiment, by setting the step 220, facilitates accurate control of the thickness of the printed solder paste, achieves uniform printing of solder paste, and improves printing quality; moreover, the step 220 can act as a reinforcing rib to improve the structural strength of the stencil body 200, avoid deformation of the stencil body 200, and further ensure printing quality.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A steel mesh structure, characterized in that, include: The outer casing has a first opening; The main body of the steel mesh is movably covered by the first opening, and the main body of the steel mesh is provided with printed holes that communicate with the first opening; as well as, An elastic element is disposed between the outer shell and the steel mesh body, and the elastic element is used to abut against the steel mesh body.

2. The steel mesh structure as described in claim 1, characterized in that, The elastic element is configured as an elastic plunger. The outer periphery of the first opening is provided with a mounting hole. One end of the elastic plunger is fixed in the mounting hole and the end of the elastic plunger facing the steel mesh body is exposed in the mounting hole to abut against the steel mesh body.

3. The steel mesh structure as described in claim 1, characterized in that, The steel mesh structure also includes: A connector that connects the steel mesh body and the outer shell.

4. The steel mesh structure as described in claim 3, characterized in that, The connector includes a spring and a fastener, with the two ends of the spring connected to the steel mesh body and the outer shell respectively via the fastener.

5. The steel mesh structure as described in claim 1, characterized in that, The outer shell has a protruding limiting ring platform on its periphery, and the limiting ring platform encloses and forms an installation groove that communicates with the first opening. The main body of the steel mesh is disposed in the installation groove.

6. The steel mesh structure as described in claim 5, characterized in that, The steel mesh structure also includes: A pressure strip is connected to the limiting ring platform. The pressure strip and the elastic element are located on opposite sides of the steel mesh body to limit the steel mesh body.

7. The steel mesh structure as described in claim 5, characterized in that, The limiting ring platform is provided with a set screw hole that communicates with the mounting groove.

8. The steel mesh structure as described in claim 1, characterized in that, The main body of the steel mesh has at least one step, and the printing hole is located on the step.

9. The steel mesh structure as described in claim 8, characterized in that, The steps include: The second opening connects the first opening to the printed hole; A mounting ring is provided, protruding from one side of the second opening and disposed along the periphery of the second opening; and, A support piece is disposed at the bottom of the second opening via the mounting ring platform, and the printed hole is disposed on the support piece.

10. The steel mesh structure as described in claim 9, characterized in that, The support sheet is configured as a steel sheet, and the printed hole penetrates through the steel sheet.

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