General fixing device for surface mount technology (SMT) reflow soldering printed circuit board (PCB)

Abstract

The utility model discloses a universal fixing device for an SMT reflow welding PCB. The universal fixing device comprises a fixing frame, four supporting rods, positioning pins and hexagon screws. Wherein a rectangular groove is formed in the center of the fixing frame, and sliding grooves are formed in the upper and lower ends of the rectangular groove; threaded holes are formed in two ends of the supporting rod; the positioning pin is fixed in a threaded hole in one end of the supporting rod; the threaded hole in the other end of the supporting rod is installed in the sliding groove of the fixing frame through a hexagon screw. The general fixing device for the SMT reflow soldering PCB overcomes the defects of an existing PCB fixing mode, and has the advantages of being high in universality, easy to install, high in reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of reflow soldering, in particular to a general fixing device for SMT reflow soldering of PCB boards. Background Art

[0002] Surface Mount Technology (SMT) is a circuit assembly technology that mounts leadless or short-lead surface mount components on the surface of a printed circuit board (PCB) or other substrates and is soldered and assembled by methods such as reflow soldering. Its basic process components include: solder paste printing, chip mounting, reflow soldering, cleaning, and inspection.

[0003] The reflow soldering process uses a chain-type reflow soldering furnace for soldering. Therefore, there should be no surface mount components within 5 mm of the edge of the PCB board. However, in PCB boards, it is common to design solder pads within 5 mm of the edge of the PCB board, resulting in the inability of the PCB board after chip mounting to directly enter the reflow soldering furnace for soldering. Currently, the method to solve this problem is to make a special tray. Making the tray is relatively simple, but before making it, the process personnel should first identify the interference positions on the PCB board, and it is difficult for inexperienced process personnel to identify all of them. Due to the variety of PCB boards with different sizes, the existing solution has many deficiencies, as follows:

[0004] 1) For each type of PCB board, one type of tray is made. Each tray has at least 3 and at most more than 5. Slight changes in the size of the PCB board will cause some trays to be scrapped after only one use, not only increasing production costs but also wasting resources.

[0005] 2) There are a large number of PCB board types, so a large number of trays will be made. First, storing these trays will occupy a large amount of space; second, problems are likely to occur in management; finally, the procedures during use are cumbersome, and there will be frequent in and out of the warehouse. In short, there are many troubles in storage, management, and use.

[0006] 3) Making the tray requires a certain period. If the tray cannot be completed on schedule or there are defects in the tray, production cannot start, thus affecting the production progress.

[0007] The existing PCB board trays can no longer meet the needs of soldering an increasing number of PCB board types. Summary of the Utility Model

[0008] The technical problem to be solved by the utility model: Overcome the deficiencies of the prior art and provide a general fixing device for SMT reflow soldering of PCB boards, aiming to overcome the deficiencies of the existing PCB board fixing methods, with the advantages of strong versatility, simple installation, and high reliability.

[0009] To solve the above technical problems, the utility model discloses a general fixing device for SMT reflow soldering PCB boards, including: a fixing frame, four support rods, positioning pins and hexagon screws; wherein, the center of the fixing frame is a rectangular groove, and sliding grooves are respectively arranged at the upper and lower ends of the rectangular groove; both ends of the support rods are threaded holes; the positioning pins are fixed in the threaded holes at one end of the support rods; the threaded holes at the other end of the support rods are installed in the sliding grooves of the fixing frame through hexagon screws.

[0010] In the above general fixing device for SMT reflow soldering PCB boards, when the hexagon screws are tightened, the support rods are fixed to the sliding grooves.

[0011] In the above general fixing device for SMT reflow soldering PCB boards, when the hexagon screws are not tightened, the support rods can move and rotate along the sliding grooves.

[0012] In the above general fixing device for SMT reflow soldering PCB boards, the distance and angle between the four support rods are determined according to the distance between the through holes on the PCB board.

[0013] In the above general fixing device for SMT reflow soldering PCB boards, the general fixing device for SMT reflow soldering PCB boards is used to fix a PCB board with dimensions of A*B; wherein, A represents the length of the PCB board, and the value range of A is 40mm to 300mm; B represents the width of the PCB board, and the value range of B is 40mm to 300mm; A≥B.

[0014] In the above general fixing device for SMT reflow soldering PCB boards, the adjustable distance between two support rods installed on the same sliding groove is 10 to 240mm.

[0015] In the above general fixing device for SMT reflow soldering PCB boards, the adjustable angle between two support rods installed on the same sliding groove is 0° to 60°.

[0016] In the above general fixing device for SMT reflow soldering PCB boards, the size of the rectangular groove at the center of the fixing frame is: 300*300mm.

[0017] In the above general fixing device for SMT reflow soldering PCB boards, the thickness of the fixing frame is 8mm.

[0018] In the above general fixing device for SMT reflow soldering PCB boards, the material of the fixing frame is synthetic stone, and the materials of the support rods, positioning pins and hexagon screws are all 316 stainless steel.

[0019] The utility model has the following advantages:

[0020] (1) The utility model discloses a general fixing device for SMT reflow soldering PCB boards, which can fix PCB boards with a size range of 40mm * 40mm to 300mm * 300mm. Compared with the existing special trays, it has strong versatility and high flexibility, can be applied to most PCB boards, and realizes cost reduction and efficiency improvement.

[0021] (2) The utility model discloses a general fixing device for SMT reflow soldering PCB boards, which has a simple structure, is easy to operate, does not require a large amount of reserves, saves space, is convenient for management, and does not require cumbersome procedures.

[0022] (3) The utility model discloses a general fixing device for SMT reflow soldering PCB boards. All components are not only durable but also replaceable, and are simple to manufacture, not easy to make mistakes, and save the manufacturing cycle. Description of the Drawings

[0023] Figure 1 is a front schematic view of a general fixing device for SMT reflow soldering PCB boards in an embodiment of the utility model;

[0024] Figure 2 is a back schematic view of a general fixing device for SMT reflow soldering PCB boards in an embodiment of the utility model;

[0025] Figure 3 is a schematic view of the usage scenario of a general fixing device for SMT reflow soldering PCB boards in an embodiment of the utility model. Detailed Embodiments

[0026] To make the purpose, technical solutions and advantages of the utility model clearer, the following will further describe in detail the disclosed embodiments of the utility model with reference to the drawings.

[0027] Refer to Figures 1-2 , in an embodiment of the utility model, the general fixing device for SMT reflow soldering PCB boards includes: a fixing frame 1, four support rods 2, a positioning pin 3, and a hexagon screw 4. Among them, the center of the fixing frame 1 is a rectangular groove, and chutes are respectively arranged at the upper and lower ends of the rectangular groove; both ends of the support rod 2 are threaded holes; the positioning pin 3 is fixed in the threaded hole at one end of the support rod 2; the threaded hole at the other end of the support rod 2 is installed in the chute of the fixing frame 1 through the hexagon screw 4.

[0028] In this embodiment, when the hexagon screw 4 is tightened, the support rod 2 is fixed to the chute. When the hexagon screw 4 is not tightened, the support rod 2 can move and rotate along the chute.

[0029] In this embodiment, the distance and angle between the four support rods 2 are determined according to the distance between the through holes on the PCB board 5.

[0030] In this embodiment, the general fixing device for SMT reflow soldering PCB boards can fix a PCB board 5 with dimensions of A*B. Among them, A represents the length of the PCB board, and the value range of A is 40 mm to 300 mm; B represents the width of the PCB board, and the value range of B is 40 mm to 300 mm; A≥B.

[0031] In this embodiment, as Figure 3 shown, the usage method of the general fixing device for SMT reflow soldering PCB boards is as follows: Fix the positioning pin 3 in the threaded hole at one end of the support rod 2; then install the threaded hole at the other end of the support rod 2 on the fixing frame 1 through the hexagon screw 4. At this time, the hexagon screw 4 is not tightened, and the support rod 2 can move. Referring to the distances between the through holes on the PCB board 5, adjust the distance and angle between the support rods 2 so that the positioning pin 3 can pass through the through holes on the PCB board 5, and then tighten the hexagon screw 4 to fix PCB boards 5 of different sizes.

[0032] In this embodiment, the adjustable distance between two support rods installed on the same chute is 10 to 240 mm; the adjustable angle between two support rods installed on the same chute is 0° to 60°; the size of the rectangular groove at the center of the fixing frame 1 is: 300*300 mm; the thickness of the fixing frame 1 is 8 mm. The length of the chute is 312 mm; the length of the support rod is 120 mm; the rotation angle range of the support rod around the hexagon screw is 0° to 60°.

[0033] In this embodiment, the material of the fixing frame 1 is synthetic stone, and the materials of the support rod 2, the positioning pin 3, and the hexagon screw 4 are all 316 stainless steel.

[0034] As described above, only the best specific implementation manner of the present utility model is described, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

[0035] The content not detailedly described in the specification of the present utility model belongs to the well-known technology of those skilled in the art.

Claims

1. A general fixing device for SMT reflow soldering PCB boards, characterized in that, Including: A fixing bracket (1), four support rods (2), a positioning pin (3) and a hexagon screw (4); wherein, the center of the fixing bracket (1) is a rectangular groove, and sliding grooves are respectively arranged at the upper and lower ends of the rectangular groove; both ends of the support rod (2) are threaded holes; the positioning pin (3) is fixed in the threaded hole at one end of the support rod (2); the threaded hole at the other end of the support rod (2) is installed in the sliding groove of the fixing bracket (1) through the hexagon screw (4).

2. The general fixing device for SMT reflow soldering PCB board according to claim 1, characterized in that, When the hexagon screw (4) is tightened, the support rod (2) is fixed to the sliding groove.

3. The general fixing device for SMT reflow soldering PCB board according to claim 1, characterized in that, When the hexagon screw (4) is not tightened, the support rod (2) can move and rotate along the sliding groove.

4. The general fixing device for SMT reflow soldering PCB board according to claim 1, characterized in that, The distance and angle between the four support rods (2) are determined according to the distance between the through holes on the PCB board (5).

5. The general fixing device for SMT reflow soldering PCB board according to claim 1, characterized in that, This general fixing device for SMT reflow soldering PCB board is used to fix the PCB board (5) with the size of A*B; wherein, A represents the length of the PCB board, and the value range of A is 40mm to 300mm; B represents the width of the PCB board, and the value range of B is 40mm to 300mm; A≥B.

6. The general fixing device for SMT reflow soldering PCB boards according to claim 1, characterized in that, The adjustable distance between two support rods installed on the same sliding groove is 10 to 240mm.

7. The general fixing device for SMT reflow soldering PCB boards according to claim 1, characterized in that, The adjustable angle between two support rods installed on the same sliding groove is 0° to 60°.

8. The general fixing device for SMT reflow soldering PCB board according to claim 1, characterized in that, The size of the rectangular groove at the center of the fixing bracket (1) is: 300*300mm.

9. The general fixing device for SMT reflow soldering PCB boards according to claim 1, characterized in that, The thickness of the fixing bracket (1) is 8mm.

10. The general fixing device for SMT reflow soldering PCB boards according to claim 1, characterized in that, The material of the fixing bracket (1) is synthetic stone, and the materials of the support rod (2), the positioning pin (3) and the hexagon screw (4) are all 316 stainless steel.

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