Thin flexible printed board gridding assembly auxiliary device

Abstract

The utility model provides a thin flexible printed board gridding assembly auxiliary device. The thin flexible printed board gridding assembly auxiliary device comprises a fixing bottom plate, a limiting frame and a pressing shaping cover plate which are detachably connected from bottom to top. According to the utility model, a single-strip-shaped and frame-type limiting and pressing design is adopted, the structure is simple, the positioning precision is high, the disassembly and assembly are simple, the processing is convenient, the replication and expansion can be realized, and the universality is strong; the limiting frame can accurately position the matching position of the microstrip line of the printed board and the base plate pin, the printed board is inserted into the corresponding slot of the limiting frame, and plug and play is achieved without adjustment. The pressing and shaping cover plate can ensure that the printed board does not deform in the assembling and curing process of the thin flexible printed board, and the bottom of the printed board is always tightly attached to the bottom plate to ensure good grounding until curing; the device provided by the utility model can be operated with a frame in the whole process of pin welding, printed board fixing and gluing and curing, and the mode can ensure that the printed board is consistent in state in the whole process of assembling and is operated with high precision; and after the welding solidification meets the requirements, dismounting can be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a grid assembly auxiliary device for a thin flexible printed circuit board. Background Art

[0002] With the development of phased array antenna technology, the antenna structure size is becoming more integrated, lightweight, and modular, and the requirements for its various technical indicators are constantly improving; this requires the antenna array structure to be cross-linked and composite to achieve full coverage of multiple spectrums and multi-function switching. Therefore, the grid-based common-aperture phased array antenna structure design is the first choice and development trend of phased array antenna array design. However, combining multiple functions in one array makes the grid array structure particularly compact, and the array printed circuit board is thin and small.

[0003] Since the microstrip lines and socket solder pins on the printed circuit board are small, it is difficult to accurately match and position them during manual assembly of the printed circuit board, and the position needs to be adjusted repeatedly. This will bring great difficulties to the rapid grid assembly and welding of the array printed circuit board. At the same time, the printed circuit board is a thin sheet, and the bottom of the printed circuit board needs to be well grounded to the surface of the antenna base plate. Conductive glue is often applied to achieve grounding, but often because the printed circuit board is a thin and flexible sheet, it cannot be in good contact with the antenna base plate in a free state. Even if conductive glue is applied, there will still be gaps causing poor grounding, affecting the antenna performance indicators. At the same time, the antenna array often needs to be moved to a drying box to accelerate curing during the curing process. If it is moved directly, it is very easy to touch the uncured printed circuit board, repeating the above-mentioned poor grounding problem.

[0004] Therefore, an auxiliary device is needed to solve the problem that the microstrip line and the pin cannot be accurately matched and positioned during the grid assembly of the thin flexible sheet printed circuit board, and the bottom of the printed circuit board and the antenna base plate cannot be well grounded. Summary of the invention

[0005] The utility model is to solve the problem that the microstrip line and the pin cannot be accurately matched and positioned during the grid assembly of the thin flexible sheet printed circuit board, and the bottom of the printed circuit board and the antenna base plate cannot be well grounded. It provides a thin flexible printed circuit board grid assembly auxiliary device, which is composed of a fixed base plate, a limit frame, and a pressing and shaping cover plate. It is used for auxiliary use during the grid cross assembly of the thin flexible printed circuit board of the antenna array. When in use, the thin flexible printed circuit boards are inserted into the limit frame one by one, and then the cover plate is pressed to achieve high-precision matching and positioning of the microstrip line of the thin flexible printed circuit board and the welding pin, and the bottom of the printed circuit board and the surface of the antenna base plate can fit tightly to ensure that the printed circuit board is well grounded. The device has a simple structure, high positioning accuracy, convenient disassembly and assembly, easy processing, replicability and expansion, strong versatility, and can be applied to the auxiliary assembly of this type of antenna array.

[0006] The utility model provides a thin flexible printed circuit board grid assembly auxiliary device, comprising a fixed bottom plate, a limit frame and a pressing and shaping cover plate which are detachably connected from bottom to top, the fixed bottom plate is used to place the antenna bottom plate to be assembled, the limit frame is used to position and match the pins of the antenna bottom plate to be assembled with the microstrip lines of the thin flexible printed circuit board grid to be assembled, and the pressing and shaping cover plate is used to insert the thin flexible printed circuit board grid to be assembled and perform correction so that the microstrip line surface of the thin flexible printed circuit board grid to be assembled is in close contact with the pins of the antenna bottom plate to be assembled;

[0007] The fixed bottom plate comprises a bottom plate and positioning protrusions connected to two sides of the bottom plate;

[0008] The limiting frame includes a frame body and a horizontal limiting slot and a vertical limiting slot connected to the upper part of the frame body, and the positions of the horizontal limiting slot and the vertical limiting slot correspond to the printed circuit board mounting slots on the surface of the antenna bottom plate to be assembled;

[0009] The upper surface and the lower surface of the frame body are both hollow structures, the horizontal limiting slot and the vertical limiting slot extend downward from the upper surface of the frame body, and the upper surface and the lower surface of the frame body are both provided with positioning grooves;

[0010] The pressing and shaping cover plate comprises a shaping cover plate body, a rectangular convex tooth connected to the lower surface of the shaping cover plate body and extending downward, and a cover plate positioning protrusion connected to both sides of the shaping cover plate body, wherein the rectangular convex tooth is matched with the printed board gap of the thin flexible printed board grid to be assembled;

[0011] During assembly, the positioning protrusion extends into the positioning groove on the lower surface of the frame body, and the positioning protrusion of the cover plate extends into the positioning groove on the upper surface of the frame body.

[0012] In the grid assembly auxiliary device for thin flexible printed circuit boards described in the present invention, as a preferred embodiment, the horizontal limiting slot is a slotted structure connected to the front and rear sides of the hollow portion on the upper surface of the frame body; the vertical limiting slot is a slotted structure connected to the left and right sides of the hollow portion on the upper surface of the frame body, and the positioning grooves are respectively arranged on the outer sides of the vertical limiting slots;

[0013] The horizontal limit slots corresponding to the two positions are a group, and the vertical limit slots corresponding to the two positions are a group;

[0014] Windows are arranged at the front and the back of the frame body.

[0015] In the thin flexible printed circuit board grid assembly auxiliary device described in the present invention, as a preferred embodiment, both the horizontal limiting slot and the vertical limiting slot are rectangular slots.

[0016] In the thin flexible printed circuit board grid assembly auxiliary device described in the present invention, as a preferred embodiment, the end faces of the horizontal limiting slots and the vertical limiting slots are both chamfered.

[0017] The thin flexible printed circuit board grid assembly auxiliary device described in the present invention is, as a preferred embodiment, the number of horizontal limit slots is 12 groups, the number of vertical limit slots is 3 groups, and the rectangular protruding teeth are arranged in a square structure of 2 rows and 11 columns.

[0018] In the thin flexible printed circuit board grid assembly auxiliary device described in the present invention, as a preferred embodiment, the rectangular protruding teeth are a square structure array that is used to match the grid gap of the printed circuit board and is evenly arranged.

[0019] The thin flexible printed circuit board grid assembly auxiliary device described in the present invention is preferably configured such that the horizontal and vertical edges of the rectangular protruding teeth are chamfered.

[0020] In the thin flexible printed circuit board grid assembly auxiliary device described in the present invention, as a preferred embodiment, the fixed base plate, the limit frame and the pressing and shaping cover plate are all made of aluminum alloy.

[0021] The thin flexible printed circuit board grid assembly auxiliary device described in the present invention is, as a preferred embodiment, when the printed circuit board grid of the thin flexible printed circuit board grid to be assembled is n×m, the number of rectangular protruding teeth is n-1×m-1, and n and m are positive integers.

[0022] The utility model provides a thin flexible printed circuit board grid assembly auxiliary device, which is composed of a fixed base plate, a limit frame, and a compression and shaping cover plate, and is used to assist in the grid cross assembly of thin flexible printed circuit boards of antenna arrays. When in use, the thin flexible printed circuit boards are inserted into the limit frames one by one, and then the cover plates are compressed to achieve high-precision matching and positioning of the thin flexible printed circuit board microstrip lines and welding pins, and the bottom of the printed circuit board can fit tightly with the surface of the antenna base plate to ensure that the printed circuit board is well grounded. The device has a simple structure, high positioning accuracy, convenient disassembly and assembly, easy processing, replicability and expansion, and strong versatility, and can be applied to the auxiliary assembly of this type of antenna array.

[0023] The utility model has the following advantages:

[0024] (1) The auxiliary device for grid assembly of thin flexible sheet printed circuit boards provided by the utility model adopts a single-strip, frame-type limiting and pressing design, has a simple structure, high positioning accuracy, simple assembly and disassembly, is easy to process, can be copied and expanded, and has strong versatility;

[0025] (2) The limiting frame used in the utility model can accurately locate the matching position between the microstrip line of the printed circuit board and the pin of the base plate. The printed circuit board only needs to be inserted into the corresponding slot of the limiting frame, which is plug-and-play and does not require adjustment.

[0026] (3) The compression and shaping cover plate designed by the utility model can ensure that the printed board does not deform during the assembly and curing process of the thin flexible printed board, and always keeps the bottom of the printed board close to the base plate to ensure good grounding until curing.

[0027] (4) The device described in the utility model can be operated with a frame during the entire process of pin welding, printed circuit board fixing, and glue coating and curing. This method can ensure that the state of the entire printed circuit board assembly process is consistent and high-precision operation is performed; after the welding and curing meet the requirements, it can be disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the assembly state of a thin flexible printed circuit board grid assembly auxiliary device;

[0029] Figure 2 A schematic diagram of a fixed base plate structure of a thin flexible printed circuit board grid assembly auxiliary device;

[0030] Figure 3 A schematic diagram of the frame structure of a thin flexible printed circuit board grid assembly auxiliary device;

[0031] Figure 4 A schematic diagram of a compression and shaping cover structure of a thin flexible printed circuit board grid assembly auxiliary device;

[0032] Figure 5 A schematic diagram of a thin flexible printed circuit board grid assembly auxiliary device;

[0033] Figure 6 A schematic diagram of the assembly process of a thin flexible printed circuit board grid assembly auxiliary device;

[0034] Figure 7 A schematic diagram of a thin flexible printed circuit board expansion state of a thin flexible printed circuit board grid assembly auxiliary device;

[0035] Figure 8 The present invention is a schematic diagram of the expanded state of the frame body of a thin flexible printed circuit board grid assembly auxiliary device.

[0036] Reference numerals:

[0037] 1. Fixed bottom plate; 11. Bottom plate; 12. Positioning protrusion; 2. Limit frame; 21. Frame body; 22. Horizontal limit slot; 23. Vertical limit slot; 3. Pressing and shaping cover plate; 31. Shaped cover plate body; 32. Rectangular convex teeth; 33. Cover plate positioning protrusion. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] Example 1

[0040] like Figures 1 to 4As shown, a thin flexible printed circuit board grid assembly auxiliary device is composed of a fixed base plate 1, a limit frame 2, and a pressing and shaping cover plate 3. The fixed base plate 1 and the limit frame 2 realize high-precision positioning of the printed circuit board thin sheet and the antenna base plate pins, and the pressing and shaping cover plate 3 is inserted into the assembly grid to realize the correction and compression of the flexible thin plate, ensuring that the bottom of the printed circuit board and the surface of the antenna base plate are tightly grounded. The entire device can move with the antenna array without changing the assembly and curing state of the printed circuit board;

[0041] The fixed bottom plate 1 is used to place the antenna bottom plate and serves as an antenna bottom plate support plate; positioning protrusions 12 are provided at both ends of the fixed bottom plate 1, and the protrusions 12 are used to limit the fixed bottom plate 1 and the limiting frame 2, and play a limiting and connecting role;

[0042] The limit frame 2 is provided with printed circuit board limit slots 22 and 23; the end faces of the limit slots 22 and 23 are chamfered to facilitate the insertion of the printed circuit board. The bottom of the limit frame 2 is hollowed out with a window, and the hollow size matches the clearance limit of the antenna base plate shape. The clearance limit, like the limit slot, ensures that the antenna base plate pins and the printed circuit board microstrip lines can be accurately positioned and matched. The two sides of the limit frame 2 are hollowed out with windows to serve as operation windows for observing the installation status of the printed circuit board, operating and fixing the printed circuit board, welding the printed circuit board and the antenna base plate pins, and applying conductive glue to the printed circuit board.

[0043] The number of the limiting slots 22 and 23 is consistent with the number of printed circuit boards; the slot sizes of the limiting slots 22 and 23 are matched with the thickness of the printed circuit board to form a limited clearance;

[0044] The pressing and shaping cover plate 3 is provided with a grid-shaped rectangular convex tooth 32. When the number of grids of the printed board is n×m, the number of the convex teeth 32 is n-1×m-1, and the size of the convex teeth 32 is matched with the size of the grid of the printed board to limit the clearance. During assembly, the convex teeth 32 of the pressing and shaping cover plate 3 are inserted into the grid of the printed board to correct the thin flexible printed board so that the microstrip line surface of the printed board can be in close contact with the antenna bottom plate pin. The pressing and shaping cover plate 3 can press the upper end surface of the printed board and apply pressure to the printed board so that the bottom end surface of the printed board can be in close contact with the surface of the antenna bottom plate, ensuring that the printed board can be well grounded with the antenna bottom plate. In order to prevent the convex teeth 32 from scratching the surface of the printed board when inserting into the grid of the printed board, the corners of the pressing and shaping cover plate 3 can be blunted and made of non-metallic materials.

[0045] This device is an auxiliary device designed to solve the problems of microstrip lines and pins being unable to be accurately positioned during grid-cross arrangement and assembly of thin flexible sheet-shaped printed circuit boards for array antennas, poor contact between the bottom of the printed circuit board and the base plate during grounding and curing, and easy deformation of the flexible printed circuit board. It can effectively solve the above problems.

[0046] In the current embodiment, if Figure 1 , 2As shown, this embodiment provides an example of a grid assembly environment for a thin-sheet printed circuit board. The example is a 12-unit array antenna. The antenna has 3 vertical printed circuit boards and 12 horizontal printed circuit boards cross-installed in a grid shape. Each unit is welded to the antenna bottom plate pins. Figure 3 As shown, the limit frame 2 in the assembly auxiliary device is also provided with 12 horizontal limit slots 22 and 3 vertical limit slots 23. Each limit slot has a limited size gap with the corresponding printed circuit board, and each limit slot corresponds to the printed circuit board installation slot of the antenna bottom plate one by one. Figure 4 As shown, the pressing and shaping cover plate 3 in the assembly auxiliary device is provided with 2×11 grid convex teeth 32 to correspond to 3×12 printed board cross grids. During assembly, the convex teeth are inserted into the printed board grid to perform the correction and fixation of the printed board. Figure 5 shown.

[0047] In the current example, Figure 6 As shown, during installation, first place the antenna base plate with the pins welded on it on the fixed base plate 1, and then dock the limit frame 2 with the positioning protrusion of the fixed base plate 1, so that the limit frame 2 limits the shape of the antenna base plate to ensure that the printed circuit board installation slot on the antenna base plate corresponds to the limit slot of the limit frame 2. At this time, the corresponding printed circuit boards can be inserted one by one according to the installation sequence of the printed circuit board design. The process of inserting the printed circuit board is simple, fast and accurate; then insert the compression and shaping cover plate 3, the convex teeth of the cover plate are close to the surface of the printed circuit board, and the printed circuit board can be corrected. At the same time, the upper end surface of the printed circuit board can be compressed to ensure that the bottom end surface of the printed circuit board is close to the surface of the antenna base plate. After completing the above printed circuit board insertion work, the printed circuit board can be fixed, welded, glued and cured from the square openings on both sides of the limit frame 2, and the whole can be placed in a drying box to accelerate the curing process. After the antenna array is assembled and cured, the auxiliary device can be removed.

[0048] The application environment can be expanded according to application needs, such as Figure 7 , 8 The device described in this patent can also be used by expanding the number of grids, that is, changing the number and size of cross-assembled printed circuit boards; it is only necessary to expand the device accordingly.

[0049] In the current example, the overall length*width*height dimensions of the assembly aid are 150mm*20mm*40mm.

[0050] The overall size of the fixed base plate 1 is 150 mm*20 mm*5 mm, and the size of the positioning protrusion 12 in the fixed base plate 1 is φ4*5 mm.

[0051] The overall size 21 of the limit frame 2 is 150mm*20mm*30mm, of which there are two key limit sizes. One is the limit slots 22 and 23 on the upper part of the limit frame 2, which are 1.3mm wide and can ensure that the gap between the sides of the inserted printed circuit board does not exceed 0.5mm. The other is the matching long groove at the bottom of the limit frame 2, which is 135mm*11mm in size and matches the array antenna base plate to ensure that the gap between the periphery of the array antenna base plate and the long groove at the bottom of the limit frame 2 does not exceed 0.5mm. These two sizes can effectively limit the position accuracy of the printed circuit board inserted into the antenna base plate.

[0052] The overall size of the compression and shaping cover plate 3 is 150mm*20mm*20+5mm, of which the cover plate 31 is 5mm high and the convex teeth 32 are 20mm high; the size of the rectangular convex teeth 32 is set to ensure that the gap on each side of the printed board does not exceed 0.3mm when it is inserted into the printed board grid, which can achieve the fixed correction effect on the flexible printed board.

[0053] In the current example, the assembly auxiliary device is made of 2A12 aluminum alloy material. Of course, in practice, it can also be made of other metal materials or hard non-metal materials. In order to ensure the overall strength and positioning accuracy of the assembly auxiliary device, it is not suitable to use soft non-metal materials.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thin flexible printed circuit board grid assembly auxiliary device, characterized in that: It comprises a fixed base plate (1), a limiting frame (2) and a pressing and shaping cover plate (3) which are detachably connected from bottom to top, the fixed base plate (1) being used to place the antenna base plate to be assembled, the limiting frame (2) being used to position and match the pins of the antenna base plate to be assembled with the microstrip lines of the thin flexible printed board grid to be assembled, and the pressing and shaping cover plate (3) being used to insert the thin flexible printed board grid to be assembled and to perform correction so that the surface of the microstrip lines of the thin flexible printed board grid to be assembled is in close contact with the pins of the antenna base plate to be assembled; The fixed base plate (1) comprises a base plate (11) and positioning protrusions (12) connected to two sides of the base plate (11); The limit frame (2) comprises a frame body (21) and a horizontal limit slot (22) and a vertical limit slot (23) connected to the upper part of the frame body (21), wherein the positions of the horizontal limit slot (22) and the vertical limit slot (23) correspond one-to-one to the printed circuit board mounting slot on the surface of the antenna base plate to be assembled; The upper surface and the lower surface of the frame body (21) are both hollow structures, the transverse limiting slot (22) and the vertical limiting slot (23) extend downward from the upper surface of the frame body (21), and the upper surface and the lower surface of the frame body (21) are both provided with positioning grooves; The pressing and shaping cover plate (3) comprises a shaping cover plate body (31), a rectangular protruding tooth (32) connected to the lower surface of the shaping cover plate body (31) and extending downward, and a cover plate positioning protrusion (33) connected to both sides of the shaping cover plate body (31), wherein the rectangular protruding tooth (32) is in gap fit with the printed board of the thin flexible printed board grid to be assembled; During assembly, the positioning protrusion (12) extends into the positioning groove on the lower surface of the frame body (21), and the cover plate positioning protrusion (33) extends into the positioning groove on the upper surface of the frame body (21).

2. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The horizontal limiting slot (22) is a slotted structure connected to the front and rear sides of the hollow portion of the upper surface of the frame body (21); the vertical limiting slot (23) is a slotted structure connected to the left and right sides of the hollow portion of the upper surface of the frame body (21), and the positioning grooves are respectively arranged on the outer sides of the vertical limiting slot (23); The two positions corresponding to the horizontal limit slots (22) form a group, and the two positions corresponding to the vertical limit slots (23) form a group; The front and rear of the frame body (21) are both provided with windows.

3. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The transverse limiting slot (22) and the vertical limiting slot (23) are both rectangular slots.

4. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The end faces of the transverse limiting slot (22) and the vertical limiting slot (23) are both chamfered.

5. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The number of the transverse limiting slots (22) is 12 groups, the number of the vertical limiting slots (23) is 3 groups, and the rectangular protruding teeth (32) are arranged in 2 rows and 11 columns in a square structure.

6. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The rectangular protruding teeth (32) are a square structure array that is used to fit with the grid gap of the printed circuit board and is evenly arranged.

7. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The transverse and longitudinal sides of the rectangular protruding teeth (32) are chamfered.

8. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: The fixed bottom plate (1), the limiting frame (2) and the pressing and shaping cover plate (3) are all made of aluminum alloy.

9. The thin flexible printed circuit board grid assembly auxiliary device according to claim 1, characterized in that: When the printed board grid of the thin flexible printed board grid to be assembled is n×m, the number of the rectangular protruding teeth (32) is n-1×m-1, and n and m are positive integers.

Images