Cable assembly anti-drawing force testing device and cable assembly anti-drawing force testing method

Abstract

The invention relates to a cable assembly anti-drawing force testing device and a cable assembly anti-drawing force testing method, the cable assembly anti-drawing force testing device comprises a cable clamp and a drawing assembly, the drawing assembly comprises a U-shaped support, a base and a slide block, the base is fixedly connected with the support, the base is provided with a guide hole, and the slide 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 are fixedly connected with the two ends of the second clamping block through 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 method for testing the tensile force of the cable assembly comprises the step of testing the tensile force by using the testing device. By adopting the technical scheme provided by the invention, a tension load acts on the connector, and a clamping force acts on the guide rod, so that a cable insulation sleeve is prevented from being worn, a cable assembly is prevented from rotating, and an operator is prevented from misjudging a test result.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical connectors, and in particular relates to a cable assembly pull-out force testing device and a cable assembly pull-out force testing method. Background Art

[0002] Large electrical installations generally include various cables and electrical connectors. Cables are made by twisting several or several groups of wires together. The structure of the cable generally includes an insulating sleeve and a wire, and the wire is sleeved in the insulating sleeve. When companies manufacture large electrical installations, they usually need to pre-assemble the cables and electrical connectors into cable assemblies to facilitate final assembly. The wires and electrical connectors are generally fixedly connected by welding, crimping, etc. However, when preparing cable assemblies in batches, if the connection between the wires and the electrical connectors is not firm and the pull-out resistance is weak, it will affect the performance of the cable assembly and cause local short circuits in the entire electrical installation. Therefore, after the cable assembly is prepared, it is usually necessary to test the pull-out resistance of the cable assembly.

[0003] For example, the patent document with publication number "CN216959162U" discloses a fixture for testing the pull-out resistance of cables, including a clamping part and a connecting seat. The clamping part is arranged on the surface of the connecting seat, and the clamping part includes an upper clamping plate, and a lower clamping plate fixed on the surface of the connecting seat and hinged to the upper clamping plate. The adjacent surfaces of the upper clamping plate and the lower clamping plate are both reserved with contact arc surfaces for clamping the outer wall of the cable, and the contact arc surface is provided with a limiting pad to prevent the cable from sliding; positioning slots are equidistantly provided on the outer wall of the upper clamping plate, and a clamping rod that cooperates with the positioning slot is provided on one side of the lower clamping plate. A clamping block is fixed on the outer wall of the connecting seat, and a limiting slot is provided in the inner cavity of the clamping block. One end of the clamping rod is connected to the limiting slot of the clamping block, and the other end is connected to the positioning slot. This patented technical solution enables the clamping and fixing of cables of different specifications, meeting the needs of batch testing of cable assemblies. For example, the patent document with publication number "CN112683662A" discloses a clamping structure and testing device for cable connector pull-out force testing, wherein the clamping structure includes: a clamping body and an assembly module. The clamping body is an openable and closable structure that forms a receiving space when closed. The assembly module, after assembly, can cooperate with the clamping body to fix and seal the open end of the receiving space and form a cable through-hole in the middle to prevent the cable connector retained in the receiving space from escaping from the clamping structure for cable connector pull-out force testing during testing. The assembly module includes multiple groups of assembly module units with successively larger sizes. Each group of assembly module units includes two split docking structures with identical structures that can be docked in the middle to form a placement hole. The assembly module units can be sequentially mated and sleeved through the placement hole. This patented technical solution can also meet the needs of tensile strength testing of cables of various specifications.

[0004] However, in the existing cable assembly tensile strength test process, a tensile testing machine is generally required to generate a corresponding tensile load on the cable assembly. If the wires and electrical connectors in the cable assembly are pulled off or separated by the tensile load, the operator can only judge by the naked eye. If the wires and electrical connectors are only disconnected or disconnected, the operator cannot distinguish them carefully with the naked eye, which can easily lead to misjudgment by the operator and affect the reliability of the test results. In addition, due to the small size of the cable assembly, the existing cable assembly tensile strength test process generally uses a tensile testing machine. The cable assembly is clamped with a fixture. The clamping elements in the fixture usually come into direct contact with the insulation sheath of the cable. After testing, the surface of the insulation sheath of the cable will be worn, 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 fixture. After some fixtures are clamped on the cable assembly, the restrictions on the freedom of rotation of the cable assembly around its own axis are not firm. During the tensile pull-out test, part of the tensile load component drives the cable assembly to rotate around its own axis, causing uneven force on the cable assembly and affecting the test result data. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a cable assembly tensile pull-out force testing device and a cable assembly tensile pull-out force testing method.

[0006] The present invention provides a cable assembly tensile force testing device, including a cable clamp and a pulling assembly, the pulling assembly including a U-shaped bracket, a base and a slider, the base and the left and right ends of the bracket are respectively fixed together by screws, the surface of the bracket is provided with a boss, the surface of the base is provided with a guide hole, and the slider is sleeved in 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 clamping block and the second clamping block are both provided with a accommodating groove, one end of the first clamping block and one end of the second clamping block are fixed together by a first screw, the other end of the first clamping block and the other end of the second clamping block are fixed together by 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 together with the first clamping block and the second clamping block respectively by a locking nut, and the closed end of the guide rod extends downward along the vertical direction.

[0007] The boss is a rectangular body, and first anti-slip grooves are provided on the left and right sides of the boss.

[0008] The surface of the slider is provided with an air avoidance groove, which is in an arc shape.

[0009] The surface of the accommodating groove is further provided with a second anti-slip pattern.

[0010] A tenon platform is further provided on the surface of the first clamping block, a tenon groove is further provided on the surface of the second clamping block, and the second screw passes through the tenon platform and the tenon groove.

[0011] In addition, the present invention also provides a method for testing the tensile strength of a cable assembly, comprising the following steps:

[0012] Step 1: Provide a cable assembly and use the aforementioned cable assembly tensile strength test device. The cable assembly includes a connector, an insulating sleeve, and a plurality of conductors. The connector has a flange and is also fixedly connected to the conductors. The conductors are accommodated in the insulating sleeve. The insulating sleeve is first clamped between the first clamping block and the second clamping block, and then the left and right sides of the flange are placed on the surface of the slider respectively.

[0013] Step 2: Provide a signal transceiver and a short connector, select one of the wires 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 short connector, then electrically connect the other end of the short connector to one end of the output wire, and 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 connect each input line, each output line, each short connector and the signal transceiver to form a closed test loop;

[0015] Step 4: providing a tensile testing machine, wherein the tensile testing machine has a power chuck and a positioning chuck, first using the power chuck to clamp the boss, and then using the positioning chuck to clamp the guide rod;

[0016] Step 5: Start the tensile testing machine and the 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 maintains it 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 listed 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 listed as a failed product.

[0017] The load threshold is 222N.

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

[0019] The characteristic time is 1 hour.

[0020] The cable assembly tensile strength test method further includes the following steps: before performing step one, wrapping the insulating sleeve with raw tape.

[0021] The beneficial effect of the present invention is that: by adopting the technical solution provided by the present invention, during the tensile pull-out test, the connector has a flange, the wire is accommodated in the insulating sleeve, one end of the wire is electrically connected to the connector first, and then the other end of the wire is electrically connected to the signal transceiver, and then the insulating sleeve is clamped between the first clamping block and the second clamping block, and then the left and right sides of the flange are respectively placed on the surface of the slider, so that the tensile load generated by the tensile testing machine actually acts on the connector, so that the tensile load is more evenly distributed on the connector, and the clamping force generated by the cable clamp on the cable assembly directly acts on the guide rod, thereby avoiding damage to the cable assembly. The cable insulation sleeve directly generates external force to prevent the surface of the cable insulation sleeve from being worn due to testing. Since the axial direction of the first screw is perpendicular to the axial direction of the second screw, the cable assembly can be prevented from rotating around its own axis during the test, thereby improving the reliability of the test result data. In addition, during the test, the wire, the short connector and the signal transceiver are connected to form a closed test loop, and the signal transceiver directly senses whether the signal can be transmitted stably. Even if there is a disconnection or disconnection between the wire and the electrical connector, it is easy for the operator to distinguish and avoid the operator from making misjudgments, thereby improving the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an axonometric diagram of a cable assembly pullout resistance testing device according to the present invention;

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

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

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

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

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

[0028] Figure 7 It is an axonometric view of the connection between the cable clamp, the drawing assembly and the tensile testing machine of the present invention;

[0029] Figure 8 It is a process flow chart of the tensile strength test of the cable assembly of the present invention.

[0030] In the figure: 1-cable clamp, 2-pulling assembly, 3-bracket, 4-base, 5-slider, 6-screw, 7-boss, 8-first clamping block, 9-second clamping block, 10-guide rod, 11-accommodating groove, 12-first screw, 13-second screw, 14-locking nut, 15-first anti-slip groove, 16-avoidance groove, 17-second anti-slip groove, 18-mortise, 19-mortise, 20-connector, 21-insulating sleeve, 22-flange, 23-raw tape, 24-tensile testing machine, 25-power chuck, 26-positioning chuck. DETAILED DESCRIPTION

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

[0032] The present invention provides a cable assembly tensile strength test device, such as Figures 1 to 8 As shown, it 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 and the left and right ends of the bracket 3 are respectively fixed together by screws 6, the surface of the bracket 3 is provided with a boss 7, the surface of the base 4 is provided with a guide hole, and 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 both provided with a accommodating groove 11, one end of the first clamping block 8 and one end of the second clamping block 9 are fixed together by a first screw 12, the other end of the first clamping block 8 and the other end of the second clamping block 9 are fixed together by 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 together with the first clamping block 8 and the second clamping block 9 by a locking nut 14, and the closed end of the guide rod 10 extends downward along the vertical direction.

[0033] By adopting the technical solution provided by the present invention, during the tensile pull-out test, the connector has a flange, the wire is accommodated in the insulating sleeve, one end of the wire is electrically connected to the connector first, and then the other end of the wire is electrically connected to the signal transceiver, and then the insulating sleeve is clamped between the first clamping block and the second clamping block, and then the left and right sides of the flange are respectively placed on the surface of the slider, so that the tensile load generated by the tensile testing machine 24 actually acts on the connector, so that the tensile load is more evenly distributed on the connector, and the clamping force generated by the cable clamp on the cable assembly directly acts on the guide rod, thereby avoiding direct impact on the cable insulating sleeve. The first screw and the second screw are perpendicular to each other, so the cable assembly can be prevented from rotating around its own axis during the test, thereby improving the reliability of the test result data. In addition, during the test, the wires, the short connector and the signal transceiver are connected to form a closed test loop, and the signal transceiver directly senses whether the signal can be transmitted stably. Even if there is a disconnection or disconnection between the wire and the electrical connector, it is easy for the operator to distinguish and avoid misjudgment by the operator, thereby improving the reliability of the test results.

[0034] Specifically, the boss 7 is a rectangular body, with first anti-slip grooves 15 on its left and right sides. The surface of the slider 5 is provided with an arc-shaped air-avoidance groove 16. The surface of the accommodating groove 11 is also provided with second anti-slip grooves 17. This further prevents the cable assembly from rotating around its own axis during the tensile test of the cable assembly.

[0035] In addition, a tenon 18 is provided on the surface of the first clamping block 8, and a tenon groove 19 is provided on the surface of the second clamping block 9. The second screw 13 also extends through the tenon 18 and the tenon groove 19. By adopting the technical solution of the present invention, the first clamping block 8 and the second clamping block 9 are engaged and connected together by the tenon 18 and the tenon groove 19, which can further prevent the cable assembly from rotating about its own axis during the tensile strength test of the cable assembly.

[0036] In addition, the present invention also provides a method for testing the tensile strength of a cable assembly, comprising the following steps:

[0037] Step 1: Provide a cable assembly and use the aforementioned cable assembly tensile strength test device. The cable assembly includes a connector 20, an insulating sleeve 21, and a plurality of wires. The connector 20 has a flange 22. The connector 20 is also fixedly connected to the wires. The wires are accommodated 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 placed on the surface of the slider 5 respectively.

[0038] Step 2: Provide a signal transceiver and a short connector, select one of the wires 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 short connector, then electrically connect the other end of the short connector to one end of the output wire, and 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 connect each input line, each output line, each short connector and the signal transceiver to form a closed test loop;

[0040] Step 4: Provide a tensile testing machine 24 having 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 maintains it 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 listed 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 listed as a failed product.

[0042] By adopting the technical solution provided by the present invention, during the tensile pull-out force test, the tensile load generated by the tensile testing machine actually acts on the connector, so that the tensile load is more evenly distributed on the connector, and the clamping force generated by the cable clamp on the cable assembly directly acts on the guide rod, thereby avoiding direct external force on the cable insulation sleeve, preventing the surface of the cable insulation sleeve from being worn due to the test, and because the axial direction of the first screw is perpendicular to the axial direction of the second screw, the cable assembly can be prevented from rotating around its own axis during the test, thereby improving the reliability of the test result data. In addition, during the test, the wire, the short connector and the signal transceiver are connected to form a closed test loop, and the signal transceiver is used to directly sense whether the signal can be transmitted stably. Even if there is a situation of collapse or disconnection between the wire and the electrical connector, it is easy for the operator to distinguish, avoiding the operator from making misjudgments, and improving the reliability of the test results.

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

[0044] In addition, the cable assembly pull-out resistance test method further includes the following steps: before performing step 1, wrapping the insulating sleeve 21 with raw tape 23. The raw tape 23 is used to protect the surface of the insulating sleeve 21 and further prevent the insulating sleeve 21 from being worn during the pull-out resistance test.

Claims

1. A cable assembly tensile strength test device, characterized by: The invention comprises a cable clamp (1) and a pulling assembly (2), wherein the pulling assembly (2) comprises a U-shaped bracket (3), a base (4) and a slider (5), wherein the base (4) and the left and right ends of the bracket (3) are respectively fixed together by screws (6), a boss (7) is provided on the surface of the bracket (3), a guide hole is provided on the surface of the base (4), and the slider (5) is fitted into the guide hole; the cable clamp (1) comprises a first clamping block (8), a second clamping block (9) and a U-shaped guide rod (10), wherein the surfaces of the first clamping block (8) and the second clamping block (9) are both provided with a convex portion (7) and a concave portion (8) of the guide rod (10). A groove (11) is provided, one end of the first clamping block (8) and one end of the second clamping block (9) are fixed together using a first screw (12), the other end of the first clamping block (8) and the other end of the second clamping block (9) are fixed together using a second screw (13), the axial direction of the first screw (12) and the axial direction of the second screw (13) are perpendicular to each other, the open end of the guide rod (10) is fixed together with the first clamping block (8) and the second clamping block (9) respectively using a locking nut (14), and the closed end of the guide rod (10) extends downward along the vertical direction.

2. A cable assembly tensile strength tester according to claim 1, characterized in that: The boss (7) is a rectangular body, and first anti-slip grooves (15) are provided on the left and right sides of the boss (7).

3. A cable assembly tensile strength testing device according to claim 1, characterized in that: The surface of the slider (5) is provided with a clearance groove (16), and the clearance groove (16) is arc-shaped.

4. A cable assembly tensile strength testing device according to claim 1, characterized in that: The surface of the accommodating groove (11) is further provided with a second anti-slip pattern (17).

5. A cable assembly tensile strength testing device according to claim 1, characterized in that: The surface of the first clamping block (8) is further provided with a tenon (18), the surface of the second clamping block (9) is further provided with a tenon groove (19), and the second screw (13) also passes through the tenon (18) and the tenon groove (19).

6. A method for testing the tensile strength of a cable assembly, characterized by: The following steps are involved: Step 1: providing a cable assembly and using the cable assembly tensile strength test device according to any one of claims 1 to 5, wherein the cable assembly comprises a connector (20), an insulating sleeve (21) and a plurality of wires, wherein the connector (20) has a flange (22), the connector (20) is further fixedly connected to the wires, and the wires are accommodated in the insulating sleeve (21), the insulating sleeve (21) is first clamped between the first clamping block (8) and the second clamping block (9), and then the left and right sides of the flange (22) are respectively placed on the surface of the slider (5); Step 2: Provide a signal transceiver and a short connector, select one of the wires 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 short connector, then electrically connect the other end of the short connector to one end of the output wire, and 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 connect each input line, each output line, each short connector and the signal transceiver to form a closed test loop; Step 4: providing a tensile testing machine (24), wherein the tensile testing machine (24) has a power chuck (25) and a positioning chuck (26), first using the power chuck (25) to clamp the boss (7), and then using 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 a load threshold and then maintains the load 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 listed 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 listed as a failed product.

7. A method for testing the tensile strength of a cable assembly according to claim 6, characterized in that: The load threshold is 222N.

8. A method for testing the tensile strength of a cable assembly according to claim 6, characterized in that: The tensile load increasing rate is 86 N / min to 94 N / min.

9. A method for testing the tensile strength of a cable assembly according to claim 6, characterized in that: The characteristic time is 1 hour.

10. A method for testing the tensile strength of a cable assembly according to claim 6, characterized in that: The cable assembly tensile strength test method further comprises the following steps: before performing step 1, wrapping the insulating sleeve (21) with a raw tape (23).

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