Jig for printed circuit board mounting

Abstract

The utility model relates to printed circuit board technical field especially relates to a fixture for printed circuit board mounting, it includes bottom membrane board, the middle part of bottom membrane board is provided with printed circuit hard board placing groove, the bottom of printed circuit hard board placing groove is provided with at least a first magnetic piece, still includes at least one briquetting, the air guide hole of through -going is set up in briquetting, the middle part of briquetting lower surface is provided with second magnetic piece, and the both sides of second magnetic piece are provided with air guide hole respectively, and first magnetic piece and second magnetic piece one -to -one corresponding magnetic attraction connection. The utility model through setting first magnetic piece in printed circuit hard board placing groove bottom and setting second magnetic piece in briquetting lower surface, in reflow soldering, utilize the principle that different pole magnetism is attracted to each other, clamps printed circuit hard board, flexible circuit board and fixes, effectively reduced the possibility that flexible circuit board appears displacement, warping, improved printed circuit board's mounting quality.

Description

Technical Field

[0001] This utility model relates to the field of printed circuit board technology, and in particular to a fixture for mounting printed circuit boards. Background Technology

[0002] In printed circuit board (PCB) assembly, flexible circuit boards (PCBs) are frequently mounted onto rigid PCBs. Currently, commonly used fixtures for PCB mounting include a base plate with a slot for the rigid PCB in the center. The mounting process is as follows: first, the rigid PCB is placed in the slot on the base plate; then, solder paste is printed and the flexible PCB is mounted on the rigid PCB; finally, the base plate, rigid PCB, and flexible PCB are placed together in a reflow oven for high-pressure reflow soldering, completing the PCB mounting process. Because flexible PCBs are lightweight and thin, they are prone to bending. Under the high temperature and pressure of the reflow oven, flexible PCBs are susceptible to displacement and warping, leading to defects such as cold solder joints and reduced PCB mounting quality. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a fixture for mounting printed circuit boards to improve the mounting quality of printed circuit boards.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a fixture for mounting printed circuit boards, including a base film plate, a printed circuit board placement groove is provided in the middle of the base film plate, at least one first magnetic component is provided at the bottom of the printed circuit board placement groove, and at least one pressure block is also included. The pressure block is provided with a vertically penetrating air guide hole, a second magnetic component is provided in the middle of the lower surface of the pressure block, and air guide holes are provided on both sides of the second magnetic component. The first magnetic component and the second magnetic component are magnetically connected in a one-to-one correspondence.

[0005] Furthermore, there are pick-and-place notches on the corresponding sides of the printed circuit board placement slot.

[0006] Furthermore, both the first and second magnetic components are high-temperature magnets.

[0007] Furthermore, the bottom of the printed circuit board placement slot is provided with a component clearance slot.

[0008] Furthermore, the bottom of the printed circuit board placement slot is provided with at least one first magnetic component mounting slot, and a first magnetic component is matched and installed in a first magnetic component mounting slot.

[0009] Furthermore, the height of the first magnetic component is lower than the depth of the first magnetic component mounting groove.

[0010] Furthermore, a second magnetic component mounting groove is provided in the middle of the lower surface of the pressure block, and the second magnetic component is matched and installed in a first magnetic component mounting groove.

[0011] Furthermore, it also includes a block storage tray, in which multiple blocks are detachably and spaced apart.

[0012] The beneficial effects of this utility model are as follows: By providing a first magnetic component and a second magnetic component, the mounting process using this fixture is as follows: First, the printed circuit board is placed in the printed circuit board placement slot of the base film plate. Then, solder paste is printed on the printed circuit board, and the flexible circuit board is placed at the corresponding mounting position on the printed circuit board. Next, pressure blocks are placed one by one on the surface of the flexible circuit board, so that the first magnetic component and the second magnetic component are located on both sides of the printed circuit board and the flexible circuit board, respectively. By using the principle of magnetic attraction between the opposite poles of the first magnetic component and the second magnetic component, the flexible circuit board is fixed on the printed circuit board. Finally, the base film plate, the printed circuit board, the flexible circuit board, and the pressure blocks are put into the reflow oven together. In the reflow oven, hot air enters the connection between the printed circuit board and the flexible circuit board through the air guide hole for reflow soldering. After soldering is completed, the printed circuit board and the flexible circuit board are taken out and cooled before being removed from the fixture, thus completing the mounting work of the printed circuit board. This invention utilizes a first magnetic component located at the bottom of the printed circuit board placement slot and a second magnetic component located on the lower surface of the pressure block. During reflow soldering, the rigid printed circuit board and the flexible circuit board are clamped and fixed by the principle of attraction between magnetic poles of different poles. This effectively reduces the possibility of displacement or warping of the flexible circuit board and improves the mounting quality of the printed circuit board. Attached Figure Description

[0013] Figure 1 This is an exploded view of the fixture in use. Figure 2 This is a top view of the bottom membrane plate; Figure 3 This is a schematic diagram of the pressing block; Figure 4 This is a schematic diagram of a compaction block storage tray; The components, parts and numbers in the figure are as follows: 1. Bottom film plate, 2. Printed circuit board placement slot, 3. First magnetic component, 4. Pressure block, 5. Air guide hole, 6. Second magnetic component, 7. Pick-up and drop notch, 8. Component clearance slot, 9. Pressure block storage tray, 10. Flexible circuit board, 11. Printed circuit board. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] The directions mentioned below are in the form of Figure 1 The orientation of each component is used as a reference.

[0016] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the fixture for mounting printed circuit boards of this utility model includes a base film plate 1, a printed circuit board placement groove 2 is provided in the middle of the base film plate 1, at least one first magnetic element 3 is provided at the bottom of the printed circuit board placement groove 2, and at least one pressure block 4 is provided. The pressure block 4 is provided with air guide holes 5 that run vertically through it. A second magnetic element 6 is provided in the middle of the lower surface of the pressure block 4. Air guide holes 5 are provided on both sides of the second magnetic element 6. The first magnetic element 3 and the second magnetic element 6 are magnetically connected in a one-to-one correspondence.

[0017] The mounting process using this fixture is as follows: First, the printed circuit board 11 is placed in the printed circuit board placement slot 2 of the base film 1. Then, solder paste is printed on the printed circuit board 11, and the flexible circuit board 10 is placed at the corresponding mounting position on the printed circuit board 11. Next, the pressure blocks 4 are placed one by one on the surface of the flexible circuit board 10, so that the first magnetic element 3 and the second magnetic element 6 are located on both sides of the printed circuit board 11 and the flexible circuit board 10, respectively. By means of the attraction between the magnetic poles of the first magnetic element 3 and the second magnetic element 6, the flexible circuit board 10 is fixed on the printed circuit board 11. Finally, the base film 1, the printed circuit board 11, the flexible circuit board 10, and the pressure blocks 4 are put into the reflow oven together. In the reflow oven, hot air enters the connection between the printed circuit board 11 and the flexible circuit board 10 through the air guide hole 5 for reflow soldering. After soldering is completed, the printed circuit board 11 and the flexible circuit board 10 are taken out and cooled before being taken out of the fixture, thus completing the mounting work of the printed circuit board.

[0018] Specifically, in order to facilitate placing the printed circuit board 11 in the printed circuit board placement slot 2 and to facilitate removing it from the printed circuit board placement slot 2, for example... Figure 2 As shown, there are pick-and-place notches 7 on the corresponding sides of the printed circuit board placement slot 2.

[0019] The shape and size of the printed circuit board placement slot 2 are adapted to the shape and size of the printed circuit board 11. The printed circuit board 11 can be used for single-sided or double-sided component mounting. For a double-sided component mounting printed circuit board 11, when mounting components on the second side, since components are already mounted on the first side, to ensure the printed circuit board 11 can be stably placed in the printed circuit board placement slot 2, for example... Figure 2 As shown, the bottom of the printed circuit board placement slot 2 is provided with component clearance slots 8, and the number and position of the component clearance slots 8 correspond to the number and position of the mounted components.

[0020] The first magnetic component 3 and the second magnetic component 6 utilize the principle of attraction between magnetic poles of different poles to clamp and fix the printed circuit rigid board and flexible circuit board. In order to improve the performance of the first magnetic component 3 and the second magnetic component 6, the first magnetic component 3 and the second magnetic component 6 are preferably high-temperature magnets.

[0021] To improve the installation firmness of the first magnetic component 3 and the second magnetic component 6, the first magnetic component 3 and the second magnetic component 6 are preferably cylindrical in shape. The bottom of the printed circuit board placement slot 2 is provided with at least one first magnetic component mounting slot, and one first magnetic component 3 is matched and installed in one first magnetic component mounting slot. The lower surface of the pressure block 4 is provided with a second magnetic component mounting slot, and the second magnetic component 6 is matched and installed in one second magnetic component mounting slot.

[0022] To prevent the first magnetic component 3 from affecting the flatness of the printed circuit board 11 placed in the printed circuit board mounting slot 2, the height of the first magnetic component 3 is lower than the depth of the first magnetic component mounting slot.

[0023] Since a relatively large number of pressure blocks 4 are used, in order to facilitate the storage of pressure blocks 4, for example... Figure 4 As shown, this utility model also includes a pressing block storage tray 9, in which multiple pressing blocks 4 are detachably and spaced apart.

[0024] In summary, this utility model, through the first magnetic element 3 disposed at the bottom of the printed circuit board placement slot 2 and the second magnetic element 6 disposed on the lower surface of the pressure block 4, utilizes the principle of magnetic attraction between different poles to clamp and fix the printed circuit board 11 and the flexible circuit board 10 during reflow soldering, effectively reducing the possibility of displacement or warping of the flexible circuit board 10 and improving the mounting quality of the printed circuit board.

Claims

1. A fixture for mounting printed circuit boards, comprising a base plate (1), wherein a printed circuit board placement groove (2) is provided in the middle of the base plate (1), characterized in that: The bottom of the printed circuit board placement slot (2) is provided with at least one first magnetic component (3) and at least one pressure block (4). The pressure block (4) is provided with a vertically penetrating air guide hole (5). The middle of the lower surface of the pressure block (4) is provided with a second magnetic component (6). The two sides of the second magnetic component (6) are respectively provided with air guide holes (5). The first magnetic component (3) and the second magnetic component (6) are magnetically connected in a one-to-one correspondence.

2. The fixture for mounting printed circuit boards as described in claim 1, characterized in that: The printed circuit board placement slot (2) has pick-up and put-out notches (7) on both sides respectively.

3. The fixture for mounting printed circuit boards as described in claim 1, characterized in that: Both the first magnetic component (3) and the second magnetic component (6) are high-temperature magnets.

4. The fixture for mounting printed circuit boards as described in claim 1, characterized in that: The bottom of the printed circuit board placement slot (2) is provided with a component clearance slot (8).

5. The fixture for mounting printed circuit boards as described in claim 1, characterized in that: The bottom of the printed circuit board placement slot (2) is provided with at least one first magnetic component mounting slot, and a first magnetic component (3) is matched and installed in a first magnetic component mounting slot.

6. The fixture for mounting printed circuit boards as described in claim 5, characterized in that: The height of the first magnetic component (3) is lower than the depth of the first magnetic component mounting groove.

7. The fixture for mounting printed circuit boards as described in claim 1, characterized in that: The lower surface of the pressure block (4) is provided with a second magnetic component mounting groove, and the second magnetic component (6) is matched and installed in a second magnetic component mounting groove.

8. The fixture for mounting printed circuit boards as described in any one of claims 1 to 7, characterized in that: It also includes a block storage tray (9), in which multiple blocks (4) are detachably spaced.

Images