Steel mesh jig for SMT (Surface Mount Technology)

Abstract

The utility model belongs to the technical field of steel mesh jigs, and discloses a steel mesh jig for SMT (Surface Mount Technology), which is characterized in that a placement groove is formed in the middle of the upper side of a base, a steel mesh is mounted on the inner side of the placement groove, and a connector accommodating groove is concavely formed in the bottom of the placement groove; a PCB supporting step and a steel mesh supporting step are arranged on the edge of the containing groove, the steel mesh supporting step is higher than the PCB supporting step, backflow grooves are formed in the front end and the rear end of the containing groove respectively, an open groove is formed in the lower end of the front face of the base, and a drawing box is installed in the open groove in a sliding mode. According to the utility model, through the arrangement of the connector accommodating groove, the plug-in connector can be placed in, the plug-in welding operation can be completed at one time in the SMT pasting process, the plug-in connector is directly positioned and printed with solder paste in the SMT pasting process, the plug-in connector is welded in a reflow soldering mode, and a plug-in soldering flux does not need to be cleaned and brushed; compared with an existing spot welding mode, one operation process can be omitted, efficiency is improved, quality is better guaranteed, and cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel mesh fixtures, and in particular relates to a steel mesh fixture for SMT patches. Background Art

[0002] SMT is the abbreviation of surface mount technology, which is the most popular technology and process in the electronic assembly industry. It is a circuit assembly technology that mounts pinless or short-lead surface mount components (abbreviated as SMC / SMD, called sheet components in Chinese) on the surface of printed circuit boards (PCB) or other substrates, and assembles them by soldering or dip soldering. During the dip soldering process, the circuit board needs to be fixed for solder paste brushing operation, so a steel mesh fixture is needed. The steel mesh can transfer the exact amount of solder paste to the exact position on the printed circuit board to help the solder paste deposition.

[0003] In the installation of plug-in connectors, the existing production process is to use spot welding equipment to process the plug-in connectors after patching. However, this assembly method is costly, has multiple operation steps, requires multiple equipment, and requires cleaning and scrubbing of the plug-in flux, which affects efficiency and quality, and consumes time and manpower.

[0004] Through the above analysis, the problems and defects of the existing technology are: the existing SMT patch plug-in connector installation method is costly, requires multiple work processes, requires multiple equipment, and requires cleaning and scrubbing of the plug-in flux, which affects efficiency and quality, and consumes time and manpower. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the utility model provides a steel mesh fixture for SMT patches.

[0006] The technical solution of the utility model is as follows: A steel mesh fixture for SMT patch is provided with a base and a steel mesh;

[0007] A placement groove is provided in the middle of the upper side of the base, the steel mesh is installed inside the placement groove, and a connector receiving groove is recessed at the bottom of the placement groove;

[0008] The edge of the placement groove is provided with a PCB board support step and a steel mesh support step, and the height of the steel mesh support step is higher than the PCB board support step.

[0009] The front and rear ends of the placement groove are respectively provided with reflux grooves, the lower end of the front side of the base is provided with a groove, a drawer box is slidably installed in the groove, and the lower end of the reflux groove is connected with the upper end of the drawer box;

[0010] A plurality of reflux holes corresponding to the reflux grooves are provided at both the front and rear ends of the steel mesh, and a plurality of through holes are provided in the middle of the steel mesh.

[0011] In one embodiment, two fixing holes are respectively provided at the left and right ends of the base, and a supporting foot is respectively fixed at the four corners of the bottom of the base.

[0012] In one embodiment, a plurality of spaced-apart positioning posts are fixed to the upper surface of the steel mesh supporting step, and the steel mesh is provided with a plurality of positioning holes cooperating with the positioning posts.

[0013] In one embodiment, an arc-shaped spring piece is fixed to each of the two ends of the pull-out box, and a limiting groove cooperating with the arc-shaped spring piece is formed at each of the two ends of the slot.

[0014] In one embodiment, a pull plate is fixed to the outer end of the pull-out box, and the lower end of the pull plate is lower than the lower end surface of the base.

[0015] In one embodiment, there are one or more connector receiving grooves.

[0016] In combination with all the above technical solutions, the beneficial effects of the utility model are as follows: the utility model is provided with a connector accommodating groove, in which a plug-in connector can be placed, so that the plug-in welding operation can be completed at one time in the SMT patch process. The plug-in connector is directly positioned in the SMT patch process, solder paste is printed, and the plug-in connector is welded by reflow soldering. There is no need to clean or scrub the plug-in flux. Compared with the existing spot welding method, one operation process can be reduced, efficiency is improved, quality is more guaranteed, and cost is reduced.

[0017] The utility model can facilitate the corresponding placement of the PCB board and the steel mesh by arranging PCB board supporting steps and steel mesh supporting steps of different heights; and the solder paste can be conveniently reflowed and collected by arranging the reflow groove and the pull-out box.

[0018] The utility model can fix the base on a workbench or other equipment through the fixing holes, thereby reducing displacement or shaking caused by vibration or external force, and ensuring the stability and accuracy of the jig during the patch process; the supporting feet provide support for the jig, preventing the jig from directly contacting the workbench, and protecting the surfaces of the jig and the workbench.

[0019] The utility model can effectively prevent the displacement or deformation of the steel mesh during the patch process through the positioning column and the positioning hole, thereby ensuring the precise position of the steel mesh on the base; through the cooperation of the arc-shaped spring piece and the limit groove, a certain resistance can be provided for the pulling out of the pull-out box, so that the pull-out box can be conveniently inserted and pulled out without sliding off by itself; the design of the pull plate enables the operator to pull the pull-out box more conveniently; the number and shape of the connector accommodating grooves can be adjusted and set according to different plug-in connectors, thereby improving the versatility and flexibility of the fixture.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] Figure 1 It is a structural schematic diagram of a steel mesh fixture for SMT patches provided by an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of a PCB board support step and a steel mesh support step provided in an embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a pull-out box provided in an embodiment of the utility model;

[0025] In the figure: 1. Base; 2. Steel mesh; 3. Placement slot; 4. Connector accommodating slot; 5. PCB board support step; 6. Steel mesh support step; 7. Reflow slot; 8. Slot; 9. Pull-out box; 10. Reflow hole; 11. Through hole; 12. Positioning column; 13. Positioning hole; 14. Arc-shaped spring; 15. Pull plate; 16. Fixing hole; 17. Support foot. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0027] like Figure 1 As shown, the SMT patch steel mesh fixture provided by the embodiment of the utility model includes a base 1 and a steel mesh 2, a placement groove 3 is opened in the middle of the upper side of the base 1, and the steel mesh 2 is installed inside the placement groove 3.

[0028] Preferably, two fixing holes 16 are respectively provided at the left and right ends of the base 1 in the embodiment of the utility model, and a support foot 17 is respectively fixed at the four corners of the bottom of the base 1.

[0029] like Figure 1 and Figure 2As shown, the placement slot 3 in the embodiment of the utility model is respectively provided with a return groove 7 at both ends, the front and rear ends of the steel mesh 2 are provided with a plurality of return holes 10 corresponding to the return groove 7, and the middle of the steel mesh 2 is provided with a plurality of through holes 11.

[0030] like Figure 1 and Figure 3 As shown, a slot 8 is provided at the lower end of the front side of the base 1 in the embodiment of the utility model, a pull-out box 9 is slidably installed in the slot 8, and the lower end of the reflux groove 7 is connected to the upper end of the pull-out box 9.

[0031] Preferably, an arc-shaped spring piece 14 is fixed at both ends of the pull-out box 9 in the embodiment of the utility model, and a limiting groove is provided at both ends of the slot 8 to cooperate with the arc-shaped spring piece 14. Through the cooperation between the arc-shaped spring piece 14 and the limiting groove, a certain resistance can be provided for pulling out the pull-out box 9, so that the pull-out box 9 can be easily inserted and pulled out, and is not easy to slide off by itself.

[0032] Preferably, a pull plate 15 is fixed to the outer end of the pull-out box 9 in the embodiment of the utility model, and the lower end of the pull plate 15 is lower than the lower end surface of the base 1. The design of the pull plate 15 enables the operator to pull the pull-out box 9 more conveniently.

[0033] like Figure 2 As shown, a connector accommodating groove 4 is recessed at the bottom of the placement groove 3 in the embodiment of the utility model, and a PCB board supporting step 5 and a steel mesh supporting step 6 are arranged at the edge of the placement groove 3, and the height of the steel mesh supporting step 6 is higher than the PCB board supporting step 5.

[0034] Preferably, a plurality of spaced positioning posts 12 are fixed to the upper surface of the steel mesh support step 6 in the embodiment of the utility model, and the steel mesh 2 is provided with a plurality of positioning holes 13 cooperating with the positioning posts 12. The positioning posts 12 and the positioning holes 13 can effectively prevent the steel mesh 2 from shifting or deforming during the patch process, thereby ensuring the accurate position of the steel mesh 2 on the base 1.

[0035] Preferably, the embodiment of the utility model is provided with one or more connector receiving slots 4. The number and shape of the connector receiving slots 4 can be adjusted and set according to different plug-in connectors, thereby improving the versatility and flexibility of the fixture.

[0036] The working principle of the utility model is as follows: when the utility model is used, the base 1 is placed on a stable workbench to ensure that the support legs 17 of the base 1 are in good contact with the table surface and the fixture is stable and does not shake. The fixing holes 16 are used to install the pins or screws to ensure that the base 1 is firmly fixed on the workbench to avoid displacement during use. The plug-in connector to be installed is placed in the connector accommodating groove 4, and the PCB board is placed on the PCB board support step 5 to ensure that the PCB board is aligned with the plug-in connector, and the pins of the plug-in connector correspond to the mounting holes on the PCB board. The steel mesh 2 is placed on the steel mesh support step 6 to ensure that the positioning column 12 is accurately aligned with the positioning hole 13 to ensure that the position of the steel mesh 2 on the base 1 is stable. Start the printing equipment and start the printing operation. During the printing process, ensure that the solder paste is evenly coated and without defects. At the same time, pay attention to controlling the printing speed and pressure to avoid damage to the plug-in connector and the PCB board. The solder paste flows to the corresponding pad position of the PCB board through the through hole 11, and the excess solder paste is pushed to the end of the steel mesh 2 by the scraper of the printing equipment, flows into the reflow tank 7 through the reflow hole 10, and flows to the pull-out box 9 through the reflow tank 7 for collection.

[0037] SPI is used to detect the state of solder paste for chip components. After the components are mounted, reflow soldering is performed and the internal soldering quality of the components is checked by XRAY. AOI is used to detect the soldering effect of the components. The soldering and plug-in quality are checked again. The SMT process combines the plug-in with the component mounting process and completes the soldering at one time, and then directly performs the glue dispensing process, eliminating the need for spot soldering and brushing the solder flux during the spot soldering process, reducing the time for product collection, handling and transportation, and saving spot soldering equipment, labor and spot soldering tooling. The efficiency of spot soldering equipment for plug-in components is low. The utility model optimizes the SMT fixture, uses the reflow soldering process to shorten the process, and greatly improves the production efficiency and quality of the product.

[0038] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements should be included in the protection scope of the utility model.

Claims

1. A steel mesh fixture for SMT patch, comprising a base (1) and a steel mesh (2), wherein a placement groove (3) is provided in the middle of the upper side of the base (1), and the steel mesh (2) is installed inside the placement groove (3), characterized in that: A connector receiving groove (4) is recessed at the bottom of the placement groove (3); The edge of the placement groove (3) is provided with a PCB board support step (5) and a steel mesh support step (6), and the height of the steel mesh support step (6) is higher than that of the PCB board support step (5). The placement groove (3) is provided with a reflux groove (7) at both the front and rear ends, and the base (1) is provided with a groove (8) at the lower end of the front face, a drawer box (9) is slidably mounted in the groove (8), and the lower end of the reflux groove (7) is connected to the upper end of the drawer box (9); A plurality of reflux holes (10) corresponding to the reflux grooves (7) are provided at both the front and rear ends of the steel mesh (2), and a plurality of through holes (11) are provided in the middle of the steel mesh (2).

2. The SMT patch steel mesh fixture according to claim 1, characterized in that: A plurality of positioning columns (12) distributed at intervals are fixed on the upper surface of the steel mesh support step (6), and a plurality of positioning holes (13) cooperating with the positioning columns (12) are provided on the steel mesh (2).

3. The SMT patch steel mesh fixture according to claim 1, characterized in that: An arc-shaped spring piece (14) is fixed to each of the two ends of the pull-out box (9), and a limiting groove cooperating with the arc-shaped spring piece (14) is provided at each of the two ends of the slot (8).

4. The SMT patch steel mesh fixture according to claim 3, characterized in that: A pull plate (15) is fixed to the outer end of the pull-out box (9), and the lower end of the pull plate (15) is lower than the lower end surface of the base (1).

5. The SMT patch steel mesh fixture according to claim 1, characterized in that: Two fixing holes (16) are respectively provided at the left and right ends of the base (1), and a support foot (17) is respectively fixed at the four corners of the bottom of the base (1).

6. The SMT patch steel mesh fixture according to claim 1, characterized in that: One or more connector accommodating grooves (4) are provided.

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