High-reliability fixing device for shielding type cable on printed board

Abstract

The utility model discloses a high-reliability fixing device for a shielding type cable on a printed board, which comprises the printed board, the shielding type cable, a metal seat and a metal cover, the shielding type cable comprises a lead and a shielding net coated outside the lead, the printed board is provided with a grounding bonding pad, the metal seat is provided with a welding through hole, and the metal cover is arranged on the metal seat. The metal seat is arranged on a grounding bonding pad of the printed board, the soldering tin is filled in the welding through hole and is connected with the grounding bonding pad, a metal seat groove is arranged on the metal seat, a metal cover groove is arranged below the metal cover, and the metal cover is arranged on the metal seat. The metal seat groove and the metal cover groove jointly form a circular through hole, the shielding type cable penetrates through the circular through hole, and the shielding net is in close contact with the hole wall of the circular through hole. According to the utility model, on the premise that punching and binding are not carried out, the wire of the shielding type cable and the shielding net are reliably fixed, the shielding net is reliably grounded, and the anti-vibration performance is improved.

Description

Technical Field

[0001] This utility model relates to a cable fixing device on a printed circuit board, and more particularly to a highly reliable fixing device for shielded cables on a printed circuit board. Background Technology

[0002] In some applications requiring efficient signal shielding, shielded cables with a shielding mesh covering the conductors (here, conductors are conductors with an insulating sheath outside the core) need to be reliably fixed to the printed circuit board, and the shielding mesh needs to be reliably grounded to achieve reliable signal shielding.

[0003] For example, in electromagnetic compatibility (EMC) experiments, shielded cables are required, and the shielding mesh is connected to the grounding terminal of the printed circuit board (PCB). Ferrite beads are also installed on the wires to filter high-frequency interference signals, preventing radiated interference from affecting the reliability of the experiment. The traditional method of mounting wires, shielding mesh, and ferrite beads on the PCB typically involves adhesive bonding of the wires or binding the wires with cotton thread after drilling through-holes in the PCB. Ferrite beads are usually fixed with adhesive, and the shielding mesh is generally made by binding copper wire and then soldering it to the PCB. This traditional installation method has the following drawbacks:

[0004] Glue fixing and cotton thread binding cannot effectively prevent the wires and ferrite beads from shaking during impact and vibration, which can easily lead to wire breakage at the solder joint and ferrite beads falling off. In addition, cotton thread binding requires two through holes to be made on the printed circuit board, which occupies space on the printed circuit board and affects the soldering of components on the other side of the printed circuit board. The shielding mesh cannot be effectively fixed and is prone to contact with components on the printed circuit board, causing short circuits. Moreover, soldering the shielding mesh can easily produce excess solder beads that affect the circuit. Utility Model Content

[0005] The purpose of this invention is to provide a highly reliable fixing device for shielded cables on printed circuit boards that can stably and reliably install shielded cables and ferrite beads, in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A high-reliability fixing device for shielded cables on a printed circuit board includes a printed circuit board and a shielded cable. The shielded cable includes conductors and a shielding mesh covering the conductors. The high-reliability fixing device for shielded cables on a printed circuit board also includes a metal base and a metal cover. The printed circuit board has a grounding pad. The metal base has a vertically penetrating soldering through hole. The metal base is placed on the grounding pad of the printed circuit board. Solder fills the soldering through hole and connects to the grounding pad. The metal base has a semi-circular radial cross-section groove on its upper surface and a horizontally penetrating metal base groove on its lower surface. The metal cover has a semi-circular radial cross-section groove on its lower surface and a horizontally penetrating metal cover groove. The metal cover is installed on the upper surface of the metal base. The metal base groove and the metal cover groove together form a horizontally penetrating circular through hole through which the shielded cable passes, and the shielding mesh is in close contact with the hole wall of the circular through hole. The aforementioned grounding pad is a printed metal layer set in the corresponding area of ​​the printed circuit board. This printed metal layer is tightly connected to the printed circuit board through the printing method and is connected to the grounding wire to achieve the grounding function.

[0008] Preferably, in order to achieve a more reliable grounding function for the shielding mesh, a lower conductive rubber with a semi-circular radial cross-section is installed in the groove of the metal seat, and an upper conductive rubber with a semi-circular radial cross-section is installed in the groove of the metal cover. The lower conductive rubber and the upper conductive rubber together form a transversely penetrating tubular conductive rubber, and the shielded cable passes through the central through hole of the tubular conductive rubber, and the shielding mesh is in close contact with the inner wall of the tubular conductive rubber.

[0009] Preferably, in order to achieve a reliable connection between the metal base and the metal cover, the stud of the vertical connecting screw passes through the corresponding through hole on the metal cover from top to bottom and connects with the corresponding screw hole on the metal base.

[0010] Preferably, in order to achieve anti-interference function and stable and reliable installation of ferrite beads, the high-reliability fixing device for shielded cables on printed circuit boards further includes an insulating cover and ferrite beads. The ferrite beads are fitted onto the conductors. The insulating cover is connected to the metal base. One end of the metal base is provided with a lower semi-circular groove with an upper opening, and the lower semi-circular groove is connected to the groove of the metal base and their center lines overlap. The upper part of the insulating cover is provided with an upper semi-circular groove with a lower opening. The ferrite beads are placed in both the lower semi-circular groove and the upper semi-circular groove.

[0011] Preferably, in order to facilitate the connection of the wires to other components and to achieve a reliable connection between the insulating cover and the metal base, the insulating cover is provided with a horizontal wire through hole through which the wires pass. The insulating cover is provided with a horizontal connection through hole located below the wire through hole, and a horizontal connection screw passes through the connection through hole and connects to the corresponding screw hole on the metal base.

[0012] Preferably, in order to facilitate the filling of solder, the metal base is thinned from top to bottom near the four corners to form four base plate connection parts, and the four welding through holes are respectively provided on the four base plate connection parts.

[0013] Preferably, in order to make the metal base and the printed circuit board more securely soldered, the lower part of the soldering through hole is a tapered hole with a larger bottom and a smaller top, and the solder is filled in the soldering through hole and on the bottom plate connection part.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention utilizes a design with a matching metal base and metal cover to securely connect the metal base to the printed circuit board (PCB) via welding. This eliminates the need for drilling holes in the PCB, avoids occupying PCB space, and prevents interference with the soldering of components on the other side of the PCB. The shielded cable passes through a circular through-hole between the metal base and metal cover, and the shielding mesh is reliably connected to the metal base. This achieves excellent wire fixation and shielding mesh grounding without the need for binding, preventing contact with components on the PCB and potential short circuits. Ultimately, it achieves reliable fixation of the shielded cable's wires and shielding mesh, and reliable grounding of the shielding mesh without drilling or binding, thus improving vibration resistance. Furthermore, by adding an insulating cover connected to the metal base, a ferrite bead is fitted onto the wire, providing anti-interference functionality and preventing radiation from affecting experimental results. The insulating cover and metal base reliably clamp and fix the ferrite bead, preventing it from falling off and further improving vibration resistance. Attached Figure Description

[0016] Figure 1 This is one of the perspective views of the high-reliability fixing device for shielded cables on printed circuit boards described in this utility model;

[0017] Figure 2 This is the second perspective view of the high-reliability fixing device for shielded cables on printed circuit boards described in this utility model, and... Figure 1 Different perspectives;

[0018] Figure 3 This is one of the perspective views of the highly reliable fixing device for shielded cables on printed circuit boards described in this utility model before assembly after removing the printed circuit board;

[0019] Figure 4 This is the second perspective view of the high-reliability fixing device for shielded cables on a printed circuit board described in this utility model, before assembly after removing the printed circuit board. Figure 3 Different perspectives. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] like Figure 1-Figure 4 As shown, the high-reliability fixing device for shielded cables on a printed circuit board according to this utility model includes a printed circuit board 1, a shielded cable, a metal base 4, and a metal cover 3. The shielded cable includes a conductor 8 and a shielding mesh 7 covering the conductor 8. The printed circuit board 1 is provided with a grounding pad (not visible in the figure but easy to understand). The metal base 4 is provided with a vertically penetrating soldering through hole 6. The metal base 4 is placed on the grounding pad of the printed circuit board 1. Solder (not visible in the figure but easy to understand) fills the soldering through hole 6 and is connected to the grounding pad. The metal seat 4 has a semi-circular radial cross-section groove on its upper part (not marked in the figure because the lower conductive rubber 14 is installed there). The metal cover 3 has a semi-circular radial cross-section groove on its lower part (not marked in the figure because the upper conductive rubber 12 is installed there). The metal cover 3 is installed on the upper part of the metal seat 4. The groove of the metal seat and the groove of the metal cover together form a horizontally through-hole. The shielded cable passes through the through-hole and the shielding mesh 7 is in close contact with the wall of the through-hole.

[0022] like Figure 1-Figure 4 As shown, this utility model also discloses the following more optimized specific structures:

[0023] To achieve a more reliable grounding function for the shielding mesh 7, a lower conductive rubber 14 with a semi-circular radial cross-section is installed in the groove of the metal seat, and an upper conductive rubber 12 with a semi-circular radial cross-section is installed in the groove of the metal cover. The lower conductive rubber 14 and the upper conductive rubber 12 together form a transversely penetrating tubular conductive rubber, and the shielded cable passes through the central through hole of the tubular conductive rubber, and the shielding mesh 7 is in close contact with the inner wall of the tubular conductive rubber.

[0024] In order to achieve a reliable connection between the metal base 4 and the metal cover 3, the stud of the vertical connecting screw 5 passes through the corresponding through hole on the metal cover 3 from top to bottom and connects with the corresponding screw hole on the metal base 4.

[0025] To achieve anti-interference function and stable and reliable installation of the magnetic bead 11, the high-reliability fixing device for shielded cables on the printed circuit board also includes an insulating cover 2 and a magnetic bead 11. The magnetic bead 11 is fitted onto the conductor 8. The insulating cover 2 is connected to the metal base 4. One end of the metal base 4 is provided with a lower semi-circular groove 13 with an upper opening, and the lower semi-circular groove 13 is connected to the groove of the metal base and their center lines overlap. The upper part of the insulating cover 2 is provided with an upper semi-circular groove 9 with a lower opening. The magnetic bead 11 is placed in both the lower semi-circular groove 13 and the upper semi-circular groove 9.

[0026] To facilitate the connection of the wire 8 with other components and to achieve a reliable connection between the insulating cover 2 and the metal base 4, the insulating cover 2 is provided with a horizontal wire through hole 15 through which the wire 8 passes. The insulating cover 2 is provided with a horizontal connection through hole located below the wire through hole 15, and the horizontal connection screw 10 passes through the connection through hole and connects to the corresponding screw hole on the metal base 4.

[0027] To facilitate solder filling, the metal base 4 is thinned from top to bottom near the four corners to form four base plate connection parts (not marked in the figure), and four soldering through holes 6 are respectively provided on the four base plate connection parts.

[0028] In order to make the metal base 4 and the printed circuit board 1 more secure by using solder, the lower middle part of the soldering through hole 6 is a tapered hole with a larger bottom and a smaller top (not visible in the figure but easy to understand), and the solder is filled in the soldering through hole and on the bottom plate connection part.

[0029] like Figure 1-Figure 4 As shown, in application, first assemble the high-reliability fixing device for shielded cables on printed circuit boards as described in this utility model, then connect both ends of the wire 8 to the relevant components to conduct relevant electromagnetic experiments; or, first install the metal base 4 on the printed circuit board 1 and install the lower conductive rubber 14, then connect one end of the wire 8 of the shielded cable to the relevant components, then pass the wire 8 through the wire through hole 15 on the insulating cover 2 and through the lower semi-circular groove 13 and the lower conductive rubber 14, then place the upper conductive rubber 12 on the wire 8 and directly above the lower conductive rubber 14, then connect the insulating cover 2 and the metal cover 3 to the metal base 4 respectively, and finally connect the other end of the wire 8 to the relevant components to conduct relevant electromagnetic experiments.

[0030] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A highly reliable fixing device for shielded cables on a printed circuit board, comprising a printed circuit board and a shielded cable, wherein the shielded cable includes conductors and a shielding mesh covering the conductors, characterized in that: The high-reliability fixing device for shielded cables on a printed circuit board further includes a metal base and a metal cover. The printed circuit board is provided with a grounding pad. The metal base is provided with a vertically penetrating soldering through hole. The metal base is placed on the grounding pad of the printed circuit board. Solder fills the soldering through hole and connects with the grounding pad. The metal base is provided with a metal base groove with a semi-circular radial cross-section and a horizontally penetrating metal base groove on its upper surface. The metal cover is provided with a metal cover groove with a semi-circular radial cross-section and a horizontally penetrating metal cover groove on its lower surface. The metal cover is installed on the upper surface of the metal base. The metal base groove and the metal cover groove together form a horizontally penetrating circular through hole through which the shielded cable passes and the shielding mesh is in close contact with the hole wall of the circular through hole.

2. The high-reliability fixing device for shielded cables on printed circuit boards according to claim 1, characterized in that: A lower conductive rubber with a semi-circular radial cross-section is installed in the groove of the metal seat, and an upper conductive rubber with a semi-circular radial cross-section is installed in the groove of the metal cover. The lower conductive rubber and the upper conductive rubber together form a transversely penetrating tubular conductive rubber, and the shielded cable passes through the central through hole of the tubular conductive rubber, and the shielding mesh is in close contact with the inner wall of the tubular conductive rubber.

3. The high-reliability fixing device for shielded cables on printed circuit boards according to claim 1, characterized in that: The stud of the vertical connecting screw passes through the corresponding through hole on the metal cover from top to bottom and connects with the corresponding screw hole on the metal base.

4. The high-reliability fixing device for shielded cables on printed circuit boards according to any one of claims 1-3, characterized in that: The high-reliability fixing device for shielded cables on printed circuit boards also includes an insulating cover and a magnetic bead. The magnetic bead is fitted onto the conductor. The insulating cover is connected to the metal base. One end of the metal base has a lower semi-circular groove with an upper opening, and the lower semi-circular groove is connected to the groove of the metal base and their center lines overlap. The upper part of the insulating cover has an upper semi-circular groove with a lower opening. The magnetic bead is placed in both the lower semi-circular groove and the upper semi-circular groove.

5. The high-reliability fixing device for shielded cables on printed circuit boards according to claim 4, characterized in that: The insulating cover has a horizontal wire through hole through which the wire passes. The insulating cover has a horizontal connecting through hole located below the wire through hole, and a horizontal connecting screw passes through the connecting through hole and connects to the corresponding screw hole on the metal base.

6. The high-reliability fixing device for shielded cables on a printed circuit board according to any one of claims 1-3, characterized in that: The metal base is thinned from top to bottom near the four corners to form four base plate connection parts, and the four welding through holes are respectively provided on the four base plate connection parts.

7. The high-reliability fixing device for shielded cables on printed circuit boards according to claim 6, characterized in that: The lower part of the welding through hole is a tapered hole that is larger at the bottom and smaller at the top. The welding through hole and the bottom plate connection part are both filled with solder.

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