Cable quick connection and disassembly device

Abstract

The utility model, which relates to the technical field of the electrical connection test, discloses a cable rapid connection and disassembly apparatus comprising a PCB test board, a wire pressing block and a cable fixing board. The PCB test board is provided with equidistant golden finger pads; a threading groove with an orifice chamfer is formed in the bottom of the wire pressing block, an isolated and insulated threading blind hole is defined by the threading groove and the golden finger bonding pad, and a screw hole is formed in the middle of the threading groove and matched with a plastic set screw; the cable fixing plate is provided with a waist round hole matched with a nylon cable tie; the three parts are detachably fixed through screw assemblies. During connection, a cable core wire penetrates into the blind hole, and the core wire and the golden finger bonding pad are pressed by the set screw; and the screw is unscrewed during disassembly. The device does not need to be welded or connected with a terminal, the assembly and disassembly time is shortened by more than 80%, the service life of the PCB test board is prolonged by 5-10 times, the line loss is reduced by more than 90%, the fault rate is reduced by more than 95%, and the device is suitable for the performance test of the outgoing line type differential electric connector.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical connection testing, in particular to a cable quick connection and disassembly device. Background Art

[0002] With the increasing use of high-speed differential electrical connectors in electronic devices, the performance testing process has increasingly demanded more convenient and reliable cable connection methods. When testing the performance of existing outlet-type differential electrical connectors, there are two main methods for connecting the differential pair wires in the tail cable to the test fixture, both of which have obvious defects:

[0003] 1. Direct soldering method: Each test requires soldering the conductor core to the PCB test board pad (or through-hole) first, and then desoldering after the test is completed. This method is time-consuming, and frequent soldering and desoldering will damage the PCB test board, resulting in reduced test performance, high PCB test board update frequency, and increased testing costs;

[0004] 2. Terminal block connection method: Wire cores must be pre-connected to the terminal blocks, which are then mated to the PCB test board socket. This method requires two additional connection points, the terminal blocks and the socket. This not only increases line loss and affects test accuracy, but also requires cumbersome terminal assembly and disassembly before and after testing, reducing test efficiency.

[0005] In order to solve the cable connection problem in the product manufacturing process, there is a patented technology in the existing technology, such as patent number CN201510558432.9 (authorization announcement number CN105140677B, named "A USBTYPEC cable solder-free assembly structure and its production process"), which discloses a solder-free assembly structure for mass production of USBTYPEC cables, specifically including cables, lower wire clamps, upper wire clamps, PCB boards, lower rear plugs and upper rear plugs. The core wire is positioned by buckling the wire clamps, and the rear plugs are buckled and pressed against the core wire and the gold fingers of the PCB board. Hot melt adhesive is used to achieve a fixed connection between the core wire and the PCB board, thereby replacing the soldering process and solving the problems of low efficiency, tin bridging, and tin-lead pollution in the manufacturing process.

[0006] However, the aforementioned patented technology CN201510558432.9 belongs to the field of connector assembly. Its core design goal is to achieve "one-time fixed assembly" of wires and connectors (for finished product manufacturing, such as USB data cables). It cannot adapt to the special needs of testing scenarios. The specific deficiencies are as follows:

[0007] 1. Unable to be repeatedly disassembled and assembled: It uses a "snap-on structure + hot melt adhesive" fixing method. After the hot melt adhesive cures, the core wire and the PCB board form an irreversible connection. After disassembly, the structure is scrapped. This completely fails to meet the requirements of "quick assembly and disassembly of cables and reuse of tooling for each test" in test scenarios.

[0008] 2. No insulation isolation design: The core wires are positioned only by wire clamps, and no isolation structure is designed for multiple differential pairs. When multiple pairs of wires are connected in parallel during testing, short circuits are likely to occur, affecting test accuracy.

[0009] 3. No stress relief mechanism: The device fails to account for the potential pulling forces on the cable during testing. The lack of cable fixation and stress relief mechanisms can easily loosen the connection between the core wire and the PCB, further impacting test reliability. This directly conflicts with the inherent problem of frequent operation leading to connection failure in testing scenarios.

[0010] 4. Lack of PCB protection function: The PCB board is a built-in component of the product and does not need to be reused. The design does not take into account the need to "avoid PCB damage". However, in testing scenarios, the PCB test board needs to be used repeatedly. This structure cannot prevent the gold fingers of the PCB board from being scratched or crushed during the installation and removal of the core wire, resulting in high test tooling costs.

[0011] In view of the defects of the existing test connection method and the insufficient adaptability of the CN201510558432.9 patent technology in the test scenario, there is an urgent need for a cable connection and disassembly device that can achieve "quick assembly and disassembly, insulation isolation, stress release, and PCB protection" to meet the core requirements of the test scenario. Utility Model Content

[0012] The purpose of the present utility model is to overcome the defects of cable connection in test scenarios in the prior art, such as "complicated operation, easy damage to PCB, and large line loss", as well as the shortcomings of the prior art, such as "inability to repeatedly disassemble and assemble, no insulation isolation, no stress release, and no PCB protection". A cable quick connection and disassembly device is provided to achieve fast and reliable assembly and disassembly of cables and test tooling, while ensuring test accuracy and the life of PCB test boards. The device is suitable for performance testing scenarios of equipment such as outlet-type differential electrical connectors, and achieves fast and reliable connection and disassembly of cables and test tooling, solving the problems of cumbersome cable assembly and disassembly, easy damage to PCB test boards, and large line loss during the test process.

[0013] The above-mentioned purpose of the utility model is achieved through the following technical solutions: a cable quick connection and disassembly device, comprising a PCB test board, a wire pressing block and a cable fixing plate,

[0014] A set of equidistant gold finger pads are provided at the edge of the PCB test board for direct electrical connection with the cable core wires; fixing holes are provided on the board body corresponding to the wire pressing block and the cable fixing plate, and there is no hot melt adhesive on the surface of the gold finger pads, which is suitable for repeated assembly and disassembly requirements, and is different from the irreversible design of "hot melt adhesive fixation" in the patent technology of CN201510558432.9;

[0015] The wire pressing block is made of insulating plastic material (such as POM polyoxymethylene, nylon 66), and a group of equidistant wire threading grooves are provided at the bottom. The wire threading grooves are of the same width and length as the gold finger pads, and the two enclose a group of mutually isolated and insulated wire threading blind holes, which solves the defect of "no insulation isolation" in the CN201510558432.9 patented technology; a 45° hole chamfer is provided at the opening of the wire threading groove to guide the cable core wire to quickly pass through; a screw hole is provided in the middle of the wire threading groove in the vertical direction, and a plastic set screw is adapted to be installed in the screw hole. After the plastic set screw is screwed in, the cable core wire in the wire threading blind hole can be pressed against the gold finger pad, and the plastic material can avoid scratching the core wire and the gold finger, realizing "repeated disassembly and assembly + PCB protection", which makes up for the deficiency of "no PCB protection" in the CN201510558432.9 patented technology; fixed holes are provided on the wire pressing block corresponding to the PCB test board and the cable fixing plate;

[0016] The cable fixing plate is made of a hard insulating material (such as ABS or aluminum alloy). Two to three round holes (15-20 mm in length and 5-8 mm in width) are provided on the plate. Nylon cable ties fit into the round holes to secure the cables and release the connection stress caused by cable pulling during testing, solving the "stress-free release" problem of the CN201510558432.9 patented technology. The cable fixing plate has fixed holes corresponding to the PCB test board and the wire pressing block.

[0017] The PCB test board, wire pressing block, and cable fixing plate are stacked in the order of "wire pressing block on top, PCB test board in the middle, and cable fixing plate on the bottom". The three are detachably connected and fixed by means of fixing holes provided by a screw assembly (including a cross-slot screw, a flat washer, and a nut), which facilitates component maintenance and replacement. This is different from the non-detachable design of the "snap-fit ​​fixation" patented technology of CN201510558432.9.

[0018] Furthermore, the depth of the wire threading blind hole is 5-8 mm, which is adapted to the stripping length of the cable core wire, ensuring that the core wire is in full contact with the gold finger pad without any excess core wire exposed, thereby ensuring the reliability of the test connection.

[0019] Furthermore, the specification of the plastic set screw is M2-M4, and the depth of the screw hole does not penetrate the wire pressing block, so as to avoid the protruding end of the screw from damaging the surface of the PCB test board, thereby enhancing the protection effect of the PCB.

[0020] The advantages of this utility model compared with the prior art are:

[0021] 1. Improved efficiency: The system uses a reusable, removable connection method using plastic set screws and no hot melt adhesive, eliminating the need for soldering or desoldering. This reduces cable connection and removal time by over 80%, significantly reducing preparation and finishing time before and after testing and significantly improving test efficiency.

[0022] 2. Cost reduction: Through the PCB protection design of "plastic set screws to prevent metal scratches + blind holes for threading to protect gold fingers + no soldering damage", the service life of the PCB test board is extended by 5-10 times, the replacement frequency of the PCB test board is reduced, and the test tooling cost is reduced, thus solving the defect of "PCB non-reusability" in the patented technology of CN201510558432.9;

[0023] 3. Accuracy assurance: The cable core wire is directly pressed against the gold finger pad by a plastic set screw, forming only one connection point. Compared with the terminal block method, two additional connection points are eliminated, reducing line loss by more than 90%. At the same time, the blind holes for threading achieve isolation and insulation of multiple groups of wires to avoid short-circuit interference, further ensuring test accuracy and making up for the shortcomings of the "non-insulation design" of the CN201510558432.9 patented technology.

[0024] 4. Improved safety: The mutually isolated and insulated design of the blind wiring holes completely eliminates the risk of short circuits between multiple sets of differential pairs. The stress relief design of the waist round hole + nylon tie prevents loose connections caused by cable pulling, reducing the failure rate during testing by more than 95%, significantly improving test safety and reliability, and solving the "no stress relief" problem of the CN201510558432.9 patented technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 : It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0027] Figure 2 : This is a schematic diagram of the three-dimensional structure with cables of the utility model;

[0028] Figure 3 : This is a schematic diagram of the structure of the utility model with cable;

[0029] Figure 4 : It is a top view of the utility model with cable;

[0030] Figure 5 :for Figure 2 A schematic diagram of the structure of one side;

[0031] Figure 6 : It is a front view of the medium voltage line block of the utility model;

[0032] Figure 7 :for Figure 6 Bottom view of .

[0033] Explanation of the numbers in the figure: 1-PCB test board, 101-gold finger pad, 102-PCB test board fixing hole; 2-wire pressing block, 201-wire threading groove, 202-hole chamfer, 203-screw hole, 204-wire pressing block fixing hole; 3-cable fixing plate, 301-waist round hole, 302-cable fixing plate fixing hole; 4-screw assembly; 5-plastic set screw; 6-cable, 601-differential pair conductor, 602-cable core wire; 7-nylon tie; A-blind hole for threading. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0035] 1. Component preparation:

[0036] PCB test board 1: Use an FR-4 epoxy glass cloth substrate. Etch the edges to form 4-8 equally spaced gold finger pads 101. The gold finger width matches the diameter of the cable core wire 602 (usually 0.5-1mm). Two to four PCB test board fixing holes 102 are symmetrically defined on the board. The hole diameter matches the screw assembly 4 (usually 3-5mm). Ensure precise alignment with the fixing holes of the wire clamp 2 and cable fixing plate 3.

[0037] Wire clamp 2: Made of POM (excellent insulation and wear resistance), the bottom is milled to have threading grooves 201 with the same number as the gold finger pads 101. The width and length of the threading grooves 201 are exactly the same as the gold finger pads 101, ensuring that the enclosed threading blind hole A can tightly wrap the core wire; the opening of the threading groove 201 is chamfered to a 45° chamfer 202 to reduce the resistance of the core wire to penetrate; the middle of the threading groove 201 is vertically processed with an M2-M4 screw hole 203 with a depth of 3-5mm (not penetrating the wire clamp) to avoid damage to the PCB test board 1; the board body is provided with a wire clamp fixing hole 204 corresponding to the PCB test board 1;

[0038] Cable fixing plate 3: Made of ABS material (lightweight and low-cost), the plate has two to three round holes 301 (15-20 mm in length and 5-8 mm in width) adapted for common nylon cable ties 7. Cable fixing plate fixing holes 302 corresponding to the PCB test board 1 and the wire pressing block 2 are also provided to ensure a stable structure after assembly.

[0039] Auxiliary components: prepare screw assembly 4 (cross recessed pan head screw, flat washer, hexagonal nut, specifications compatible with the fixing hole position), M2-M4 nylon plastic set screw 5 (to prevent metal conductivity and scratches), 3-5mm wide nylon cable tie 7 (good toughness and easy to cut).

[0040] 2. Overall assembly:

[0041] Stack the three in the order of "crimping block 2 on top, PCB test board 1 in the middle, and cable fixing board 3 on the bottom". Use the positioning tool to ensure that the crimping block fixing hole 204, PCB test board fixing hole 102, and cable fixing board fixing hole 302 are completely aligned to avoid misalignment of the blind hole A caused by assembly deviation.

[0042] Insert the cross-recessed screw of screw assembly 4 through the wire clamp fixing hole 204, the PCB test board fixing hole 102, and the cable fixing hole 302. Insert the flat washer into the end of the screw and screw on the hexagonal nut. Tighten the nut with a torque wrench (control the torque within 0.8-1.2N·m) to ensure the structure is stable and avoid damaging the PCB test board 1 or wire clamp 2 by overtightening.

[0043] After assembly is completed, check the integrity of the blind hole A to ensure there is no misalignment or gap to ensure isolation and insulation effect.

[0044] 3. Cable connection operation:

[0045] 1. Cable Pretreatment: Take the cable 6 at the end of the differential electrical connector to be tested and separate the internal differential pair wires 601 along the length (to avoid entanglement). Use precision wire strippers to strip 5-8 mm of insulation from the end of each wire to expose the metal cable core 602. Wipe the core surface with a dust-free cloth to ensure there is no oxide layer or broken wires to prevent poor contact.

[0046] 2. Cable Fixing: Pass the nylon tie 7 through the waist hole 301 of the cable fixing plate 3, place the middle part of the cable 6 (near the differential pair conductor separation) in the middle of the tie, tighten the tie so that the cable is close to the surface of the cable fixing plate 3, and use scissors to cut off the excess part of the tie (leave 1-2mm of margin to prevent the tie from loosening). This step relieves the stress on the connection point between the core wire and the gold finger when the cable is pulled;

[0047] 3. Core wire insertion: Align the pre-treated cable core wire 602 with the chamfer 202 of the hole of the wire threading groove 201. Using the chamfer as a guide, slowly insert the core wire into the blind hole A until the end of the core wire is in contact with the bottom of the blind hole (PCB test board surface). Ensure that the core wire is in full contact with the gold finger pad 101.

[0048] 4. Tighten and secure: Use a flat-blade wrench to slowly screw the plastic set screw 5 into the screw hole 203. Observe the contact of the core wire during the screwing process until the end of the screw is in close contact with the cable core wire 602 (preferably without noticeable deformation of the core wire). This completes the electrical connection between the cable and the PCB test board. Now, you can connect the test equipment to conduct performance testing.

[0049] 4. Cable removal operation:

[0050] 1. Loosen the set screw: After the test is complete, use a flat-head wrench to reversely loosen the plastic set screw 5 until the end of the screw is completely free of the cable core 602 (remain in the screw hole 203 to prevent loss or damage).

[0051] 2. Pull out the core wire: Pinch the end of the cable core wire 602 with your fingers (if the core wire is short, you can use tweezers to assist) and slowly pull it out along the axis of the blind hole A. If you encounter slight resistance, gently shake the core wire to avoid breaking the core wire or scratching the gold finger by forcibly pulling.

[0052] 3. Remove the cable tie: Use scissors to cut the nylon cable tie 7 on the cable fixing plate 3, remove the cable 6 from the cable fixing plate 3, check the status of the gold finger pad 101 and the blind hole A of the PCB test board 1, and after confirming that there is no damage, the device can be reassembled with a new cable to enter the next round of testing.

[0053] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cable quick connection and removal device, comprising a PCB test board (1), a wire pressing block (2) and a cable fixing plate (3), characterized in that: The edge of the PCB test board (1) is provided with a group of equidistant gold finger pads (101), and the board body is provided with a PCB test board fixing hole (102); the bottom of the wire pressing block (2) is provided with a group of equidistant wire threading grooves (201), the hole openings of the wire threading grooves (201) are provided with hole chamfers (202), the middle of the wire threading grooves (201) is provided with a screw hole (203) along the vertical direction, the screw hole (203) is adapted to be equipped with a plastic set screw (5), and the wire pressing block (2) is provided with a wire pressing block fixing hole (204); the cable fixing plate (3) is provided with a waist round hole (301), and the cable fixing plate (3) is provided with a cable fixing hole (302); the PCB test board (1), the wire pressing block (2) and the cable fixing plate (3) are detachably connected and fixed by a screw assembly (4) passing through the PCB test board fixing hole (102), the wire pressing block fixing hole (204) and the cable fixing plate fixing hole (302).

2. A cable quick connection and disconnection device according to claim 1, characterized in that: The wire threading groove (201) of the wire pressing block (2) and the gold finger pad (101) of the PCB test board (1) are of equal width and length. After the three are assembled, the wire threading groove (201) and the gold finger pad (101) enclose a group of mutually isolated and insulated wire threading blind holes (A).

3. A cable quick connection and disconnection device according to claim 2, characterized in that: The depth of the blind threading hole (A) is 5-8 mm, which is adapted to the stripping length of the cable core wire (602).

4. A cable quick connection and disconnection device according to claim 1, characterized in that: The plastic set screw (5) is made of nylon and has a specification of M2-M4. The depth of the screw hole (203) does not penetrate the wire pressing block (2).

5. The cable quick connection and disconnection device according to claim 1, characterized in that: The number of the waist-shaped holes (301) is 2-3, the length is 15-20 mm, and the width is 5-8 mm. Nylon cable ties (7) are adapted to be placed inside the waist-shaped holes (301).

6. A cable quick connection and disconnection device according to claim 1, characterized in that: The screw assembly (4) comprises a cross slot screw, a flat washer and a nut, and the tightening torque is controlled within a range of 0.8-1.2 N·m.

7. The cable quick connection and disconnection device according to claim 1, characterized in that: The wire pressing block (2) is made of POM polyoxymethylene or nylon 66, the cable fixing plate (3) is made of ABS or aluminum alloy, and the PCB test board (1) is made of FR-4 epoxy glass cloth substrate.

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