Cable assembly pull-out resistance testing device and cable assembly pull-out resistance testing method

Abstract

The present application relates to a cable assembly pull-out resistance testing device and a cable assembly pull-out resistance testing method, the cable assembly pull-out resistance testing device comprises a cable clamp and a pull-out assembly, the pull-out assembly comprises a U-shaped support, a base and a sliding block, the base is fixedly connected with the support, the base is provided with a guide hole, and the sliding block is sleeved in the guide hole; the cable clamp comprises a first clamping block, a second clamping block and a U-shaped guide rod, the two ends of the first clamping block and the two ends of the second clamping block are fixedly connected by using a first screw and a second screw respectively, the axial direction of the first screw is perpendicular to the axial direction of the second screw, and the open end of the guide rod is fixedly connected with the first clamping block and the second clamping block. The cable assembly pull-out resistance testing method comprises the step of using the above-mentioned testing device to perform a pull-out resistance test. By adopting the technical scheme provided by the present application, the tension load acts on the connector, the clamping force acts on the guide rod, the cable insulation sleeve is prevented from being worn, the cable assembly is prevented from rotating, and the operator is prevented from misjudging the test result.

Description

Technical Field

[0001] This invention belongs to the field of electrical connector technology, and particularly relates to a cable assembly pull-out force testing device and a cable assembly pull-out force testing method. Background Technology

[0002] Large electrical installations typically include various cables and electrical connectors. Cables are made by twisting together several or groups of conductors. The structure of a cable generally includes an insulating sleeve and conductors, with the conductors housed within the insulating sleeve. When manufacturing large electrical installations, companies usually need to pre-assemble cables and electrical connectors into cable assemblies for final assembly. The conductors and electrical connectors are generally fixed together by welding, crimping, or other methods. However, when mass-producing cable assemblies, if the connection between the conductors and electrical connectors is not firm and the pull-out resistance is weak, it will affect the performance of the cable assembly and cause partial open circuits in the entire electrical installation. Therefore, after the cable assembly is manufactured, it is usually necessary to test the pull-out resistance of the cable assembly.

[0003] For example, patent document with publication number "CN216959162U" discloses a fixture for testing the pull-out performance of cables, including a clamping part and a connecting seat. The clamping part is disposed on the surface of the connecting seat and includes an upper clamping plate and a lower clamping plate fixed to the surface of the connecting seat and hinged to the upper clamping plate. The adjacent surfaces of the upper and lower clamping plates are reserved with contact arc surfaces for clamping the outer wall of the cable. The surface of the contact arc surfaces is provided with limiting pads to prevent the cable from sliding. The outer wall of the upper clamping plate is provided with positioning slots at equal intervals. One side of the lower clamping plate is also provided with a clamping rod that cooperates with the positioning slots. The outer wall of the connecting seat is fixed with a clamping block. The inner cavity of the clamping block is provided with a limiting groove. One end of the clamping rod is connected to the limiting groove of the clamping block and the other end is connected to the positioning slot. This patented technology enables the clamping and fixing of cables of different specifications, meeting the needs of batch testing of cable assemblies. For example, patent document CN112683662A discloses a clamping structure and testing device for testing the pull-out force of cable connectors. The clamping structure includes a clamping body and an assembly module. The clamping body is an openable / closable structure, forming a receiving space when closed. The assembly module, after assembly, cooperates with the clamping body, fixing and sealing the opening of the receiving space, and forming a cable through-hole in the middle. This prevents cable connectors trapped in the receiving space from detaching from the clamping structure during testing. The assembly module includes multiple sets of assembly module units with progressively larger sizes. Each set of assembly module units includes two identical split-connection structures that can be joined together in the middle to form a placement hole. The assembly module units can be sequentially fitted together through the placement hole. This patented technology can also meet the needs of testing the pull-out force of cables of various specifications.

[0004] However, existing cable assembly pull-out force testing processes generally require the use of a tensile testing machine to apply a tensile load to the cable assembly. If the conductors and connectors in the cable assembly are pulled out or separated by this tensile load, the operator can only judge by visual inspection. If the connection between the conductor and connector is merely a loose or partial break, the operator cannot clearly distinguish it visually, easily leading to misjudgment and affecting the reliability of the test results. Furthermore, due to the small size of cable assemblies, existing cable assembly pull-out force testing processes generally use… When cable assemblies are clamped using fixtures, the clamping elements in the fixtures are usually in direct contact with the cable insulation. After testing, this can cause wear on the surface of the cable insulation, affecting the appearance quality of the cable assembly. The tensile load generated by the tensile testing machine is directly transmitted to the cable through the fixtures. Some fixtures do not adequately restrict the degree of freedom of the cable assembly to rotate around its own axis after clamping. During the pull-out test, a portion of the tensile load will drive the cable assembly to rotate around its own axis, causing uneven stress on the cable assembly and affecting the test results. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a cable assembly pull-out force testing device and a cable assembly pull-out force testing method.

[0006] This invention provides a cable assembly pull-out force testing device, including a cable clamp and a pull-out assembly. The pull-out assembly includes a U-shaped bracket, a base, and a slider. The base is fixed to the left and right ends of the bracket with screws. The bracket has a boss on its surface, and the base has a guide hole on its surface. The slider is fitted into the guide hole. The cable clamp includes a first clamping block, a second clamping block, and a U-shaped guide rod. The surfaces of the first and second clamping blocks are each provided with receiving grooves. One end of the first clamping block is fixed to one end of the second clamping block with a first screw, and the other end of the first clamping block is fixed to the other end of the second clamping block with a second screw. The axial direction of the first screw is perpendicular to the axial direction of the second screw. The open end of the guide rod is fixed to the first and second clamping blocks with locking nuts, and the closed end of the guide rod extends downward in a vertical direction.

[0007] The boss is rectangular, and the left and right sides of the boss are provided with first anti-slip texture.

[0008] The surface of the slider is provided with a clearance groove, which is arc-shaped.

[0009] The surface of the receiving groove is also provided with a second anti-slip texture.

[0010] The surface of the first clamping block is also provided with a tenon, the surface of the second clamping block is also provided with a mortise, and the second screw also passes through the tenon and the mortise.

[0011] In addition, the present invention also provides a method for testing the pull-out force of cable assemblies, comprising the following steps:

[0012] Step 1: Provide a cable assembly and use the aforementioned cable assembly pull-out force testing device. The cable assembly includes a connector, an insulating sleeve, and several wires. The connector has a flange and is also fixed to the wires. The wires are housed in the insulating sleeve. First, clamp the insulating sleeve between the first clamp and the second clamp. Then, place the left and right sides of the flange on the surface of the slider.

[0013] Step 2: Provide a signal transceiver and a jumper. Select one wire as the input wire and the other wire as the output wire. Electrically connect one end of the input wire to the output terminal of the signal transceiver. Then, electrically connect the other end of the input wire to one end of the jumper, and electrically connect the other end of the jumper to one end of the output wire. Finally, electrically connect the other end of the output wire to the input terminal of the signal transceiver.

[0014] Step 3: Repeat Step 2 several times to ensure that each input line, each output line, each jumper and signal transceiver is connected to form a closed test circuit.

[0015] Step 4: Provide a tensile testing machine, which has a power chuck and a positioning chuck. First, use the power chuck to clamp the boss, and then use the positioning chuck to clamp the guide rod.

[0016] Step 5: Start the tensile testing machine and signal transceiver, so that the tensile load generated by the tensile testing machine on the boss increases uniformly from zero to the load threshold and is maintained for a characteristic time. During the characteristic time, the signal transceiver sends a test signal to the input line. If the signal transceiver receives the test signal from the corresponding output line, the corresponding cable assembly is classified as qualified. If the signal transceiver does not receive the test signal from the corresponding output line, the test is immediately terminated and the corresponding cable assembly is classified as unqualified.

[0017] The load threshold is 222N.

[0018] The tensile load increment rate is 86 N / min to 94 N / min.

[0019] The characteristic time is 1 hour.

[0020] The cable assembly pull-out force test method further includes the following steps: before performing step one, wrap the insulating sleeve with PTFE tape.

[0021] The beneficial effects of this invention are as follows: Using the technical solution provided by this invention, during the tensile strength test, the connector has a flange, and the wire is housed within an insulating sleeve. First, one end of the wire is electrically connected to the connector, and then the other end of the wire is electrically connected to a signal transceiver. The insulating sleeve is then clamped between the first and second clamping blocks. Next, the left and right sides of the flange are placed on the surface of the slider, ensuring that the tensile load generated by the tensile testing machine is effectively applied to the connector, resulting in a more even distribution of the tensile load. Meanwhile, the clamping force generated by the cable clamp on the cable assembly is directly applied to the guide rod, thereby avoiding damage to the cable. The cable insulation sleeve directly generates external force to prevent surface wear due to testing. Since the axes of the first and second screws are perpendicular, the cable assembly is prevented from rotating around its own axis during testing, improving the reliability of the test results. Furthermore, during testing, the wires, short connectors, and signal transceiver form a closed test circuit. The transceiver directly senses whether the signal can be transmitted stably. Even if there are instances of disconnection or breakage between the wires and electrical connectors, the operator can easily identify these issues, preventing misjudgments and improving the reliability of the test results. Attached Figure Description

[0022] Figure 1 This is an isometric view of the cable assembly pull-out force testing device of the present invention;

[0023] Figure 2 This is an isometric view of the drawing assembly of the present invention;

[0024] Figure 3 This is an isometric view of the cable clamp of the present invention;

[0025] Figure 4 This is an isometric view of the bracket of the present invention;

[0026] Figure 5 This is an isometric view of the first clamping block of the present invention;

[0027] Figure 6 This is an isometric view of the second clamping block of the present invention;

[0028] Figure 7 This is an isometric view of the connection between the cable clamp, the pulling assembly, and the tensile testing machine of the present invention;

[0029] Figure 8 This is a process flow diagram of the cable assembly pull-out force test of the present invention.

[0030] In the diagram: 1-Cable clamp, 2-Pull-out assembly, 3-Bracket, 4-Base, 5-Slider, 6-Screw, 7-Boss, 8-First clamping block, 9-Second clamping block, 10-Guide rod, 11-Accommodation groove, 12-First screw, 13-Second screw, 14-Locking nut, 15-First anti-slip texture, 16-Clearing groove, 17-Second anti-slip texture, 18-Tongue platform, 19-Tongue groove, 20-Connector, 21-Insulating sleeve, 22-Flange, 23-PTZ tape, 24-Tension testing machine, 25-Power chuck, 26-Positioning chuck. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings, but the scope of protection claimed is not limited thereto;

[0032] This invention provides a device for testing the pull-out force of cable assemblies, such as... Figures 1 to 8 As shown, the cable clamp includes a cable clamp 1 and a pulling assembly 2. The pulling assembly 2 includes a U-shaped bracket 3, a base 4, and a slider 5. The base 4 is fixed to the left and right ends of the bracket 3 with screws 6. The surface of the bracket 3 is provided with a boss 7, and the surface of the base 4 is provided with a guide hole. The slider 5 is fitted into the guide hole. The cable clamp 1 includes a first clamping block 8, a second clamping block 9, and a U-shaped guide rod 10. The surfaces of the first clamping block 8 and the second clamping block 9 are provided with receiving grooves 11. One end of the first clamping block 8 is fixed to one end of the second clamping block 9 with a first screw 12, and the other end of the first clamping block 8 is fixed to the other end of the second clamping block 9 with a second screw 13. The axial direction of the first screw 12 is perpendicular to the axial direction of the second screw 13. The open end of the guide rod 10 is fixed to the first clamping block 8 and the second clamping block 9 with locking nuts 14. The closed end of the guide rod 10 extends downward in the vertical direction.

[0033] Using the technical solution provided by this invention, during the pull-out force test, the connector has a flange, and the wire is housed in an insulating sleeve. First, one end of the wire is electrically connected to the connector, and then the other end of the wire is electrically connected to the signal transceiver. The insulating sleeve is then clamped between the first and second clamping blocks. Next, the left and right sides of the flange are placed on the surface of the slider, so that the tensile load generated by the tensile testing machine 24 is actually applied to the connector, making the tensile load more evenly distributed on the connector. Meanwhile, the clamping force generated by the cable clamp on the cable assembly is directly applied to the guide rod, thereby avoiding direct contact with the cable insulating sleeve. The external force generated during testing prevents wear on the cable insulation sleeve. Since the axes of the first and second screws are perpendicular, the cable assembly is prevented from rotating around its own axis during testing, improving the reliability of the test results. Furthermore, during testing, the wires, short connectors, and transceiver form a closed test loop. The transceiver directly senses whether the signal can be transmitted stably. Even if there are instances of disconnection or breakage between the wires and the electrical connector, the operator can easily identify these issues, preventing misjudgments and improving the reliability of the test results.

[0034] Specifically, the boss 7 is rectangular, and the left and right sides of the boss 7 are provided with first anti-slip textures 15. The surface of the slider 5 is provided with a clearance groove 16, which is arc-shaped. The surface of the receiving groove 11 is also provided with second anti-slip textures 17. During the pull-out force test of the cable assembly, this further prevents the cable assembly from rotating around its own axis.

[0035] In addition, the surface of the first clamping block 8 is provided with a tenon 18, and the surface of the second clamping block 9 is provided with a tenon 19. The second screw 13 also passes through the tenon 18 and the tenon 19. By adopting the technical solution of the present invention, the first clamping block 8 and the second clamping block 9 are connected together by the tenon 18 and the tenon 19, which can further prevent the cable assembly from rotating around its own axis during the pull-out force test of the cable assembly.

[0036] Furthermore, the present invention also provides a method for testing the pull-out force of a cable assembly, comprising the following steps:

[0037] Step 1: Provide a cable assembly and use the aforementioned cable assembly pull-out force testing device. The cable assembly includes a connector 20, an insulating sleeve 21, and several wires. The connector 20 has a flange 22 and is also fixed to the wires. The wires are housed in the insulating sleeve 21. First, the insulating sleeve 21 is clamped between the first clamping block 8 and the second clamping block 9. Then, the left and right sides of the flange 22 are respectively placed on the surface of the slider 5.

[0038] Step 2: Provide a signal transceiver and a jumper. Select one wire as the input wire and the other wire as the output wire. Electrically connect one end of the input wire to the output terminal of the signal transceiver. Then, electrically connect the other end of the input wire to one end of the jumper, and electrically connect the other end of the jumper to one end of the output wire. Finally, electrically connect the other end of the output wire to the input terminal of the signal transceiver.

[0039] Step 3: Repeat Step 2 several times to ensure that each input line, each output line, each jumper and signal transceiver is connected to form a closed test circuit.

[0040] Step 4: Provide a tensile testing machine 24, which has a power chuck 25 and a positioning chuck 26. First, use the power chuck 25 to clamp the boss 7, and then use the positioning chuck 26 to clamp the guide rod 10.

[0041] Step 5: Start the tensile testing machine 24 and the signal transceiver, so that the tensile load generated by the boss 7 of the tensile testing machine 24 increases uniformly from zero to the load threshold and is maintained for a characteristic time. During the characteristic time, the signal transceiver sends a test signal to the input line. If the signal transceiver receives the test signal from the corresponding output line, the corresponding cable assembly is classified as a qualified product. If the signal transceiver does not receive the test signal from the corresponding output line, the test is immediately terminated and the corresponding cable assembly is classified as a defective product.

[0042] By employing the technical solution provided by this invention, during the pull-out force test, the tensile load generated by the tensile testing machine is substantially applied to the connector, resulting in a more uniform distribution of the tensile load on the connector. The clamping force generated by the cable clamp on the cable assembly is directly applied to the guide rod, thereby avoiding direct external force on the cable insulation sleeve and preventing surface wear due to testing. Furthermore, since the axial direction of the first screw is perpendicular to the axial direction of the second screw, the cable assembly is prevented from rotating around its own axis during testing, improving the reliability of the test results. Additionally, during testing, the wires, short connectors, and signal transceiver form a closed test circuit. The signal transceiver directly senses whether the signal can be transmitted stably. Even if there is a disconnection or breakage between the wires and the electrical connector, it is easy for the operator to identify, avoiding misjudgments and improving the reliability of the test results.

[0043] Specifically, the load threshold is 222N. The tensile load increment rate is 86N / min to 94N / min. The characteristic time is 1 hour.

[0044] In addition, the cable assembly pull-out test method also includes the following steps: Before performing step one, wrap the insulation sleeve 21 with PTFE tape 23. PTFE tape 23 is used to protect the surface of the insulation sleeve 21, further preventing wear on the insulation sleeve 21 during the pull-out test.

Claims

1. A device for testing the pull-out force of a cable assembly, characterized in that: The cable clamp (1) and the pull-out assembly (2) are included. The pull-out assembly (2) includes a U-shaped bracket (3), a base (4), and a slider (5). The base (4) is fixed to the left and right ends of the bracket (3) with screws (6). The surface of the bracket (3) is provided with a boss (7), and the surface of the base (4) is provided with a guide hole. The slider (5) is fitted into the guide hole. The cable clamp (1) includes a first clamping block (8), a second clamping block (9), and a U-shaped guide rod (10). The surfaces of the first clamping block (8) and the second clamping block (9) are provided with a commutator. The groove (11) is fixedly connected to one end of the first clamping block (8) and one end of the second clamping block (9) with a first screw (12), and the other end of the first clamping block (8) and the other end of the second clamping block (9) with a second screw (13). The axial direction of the first screw (12) is perpendicular to the axial direction of the second screw (13). The open end of the guide rod (10) is fixedly connected to the first clamping block (8) and the second clamping block (9) with locking nuts (14) respectively. The closed end of the guide rod (10) extends downward in the vertical direction. The surface of the first clamping block (8) is also provided with a tenon (18), the surface of the second clamping block (9) is also provided with a mortise (19), and the second screw (13) also passes through the tenon (18) and the mortise (19); The cable assembly includes a connector (20), an insulating sleeve (21), and a plurality of wires. The connector (20) has a flange (22) and is also fixed to the wires, which are housed within the insulating sleeve (21).

2. The cable assembly pull-out force testing device as described in claim 1, characterized in that: The boss (7) is a rectangular body, and the left and right sides of the boss (7) are also provided with first anti-slip texture (15).

3. The cable assembly pull-out force testing device as described in claim 1, characterized in that: The surface of the slider (5) is provided with a clearance groove (16), which is arc-shaped.

4. The cable assembly pull-out force testing device as described in claim 1, characterized in that: The surface of the receiving groove (11) is also provided with a second anti-slip texture (17).

5. A method for testing the pull-out force of a cable assembly, characterized in that: Includes the following steps: Step 1: Provide a cable assembly and use the cable assembly pull-out force testing device as described in any one of claims 1 to 4. First, clamp the insulating sleeve (21) between the first clamping block (8) and the second clamping block (9), and then place the left and right sides of the flange (22) on the surface of the slider (5) respectively. Step 2: Provide a signal transceiver and a jumper. Select one wire as the input wire and the other wire as the output wire. Electrically connect one end of the input wire to the output terminal of the signal transceiver. Then, electrically connect the other end of the input wire to one end of the jumper, and electrically connect the other end of the jumper to one end of the output wire. Finally, electrically connect the other end of the output wire to the input terminal of the signal transceiver. Step 3: Repeat Step 2 several times to ensure that each input line, each output line, each jumper and signal transceiver is connected to form a closed test circuit. Step 4: Provide a tensile testing machine (24), which has a power chuck (25) and a positioning chuck (26). First, use the power chuck (25) to clamp the boss (7), and then use the positioning chuck (26) to clamp the guide rod (10). Step 5: Start the tensile testing machine (24) and the signal transceiver, so that the tensile load generated by the tensile testing machine (24) on the boss (7) increases uniformly from zero to the load threshold and is maintained for a characteristic time. During the characteristic time, the signal transceiver sends a test signal to the input line. If the signal transceiver receives the test signal from the corresponding output line, the corresponding cable assembly is classified as qualified. If the signal transceiver does not receive the test signal from the corresponding output line, the test is immediately ended and the corresponding cable assembly is classified as unqualified.

6. The method for testing the pull-out force of a cable assembly as described in claim 5, characterized in that: The load threshold is 222N.

7. The method for testing the tensile strength of a cable assembly as described in claim 5, characterized in that: The tensile load increment rate is 86 N / min to 94 N / min.

8. The method for testing the pull-out force of a cable assembly as described in claim 5, characterized in that: The characteristic time is 1 hour.

9. The method for testing the pull-out force of a cable assembly as described in claim 5, characterized in that: The cable assembly pull-out test method further includes the following steps: before performing step one, wrap the insulating sleeve (21) with PTFE tape (23).

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