A bending resistance testing apparatus for a cable

Abstract

The utility model relates to a kind of bending resistance performance test equipment of cable, including fixed support, the one end of fixed support is rotatably connected with movable support, fixed support and movable support are all installed with clamping assembly, clamping assembly includes the fixed clamp block being respectively installed on fixed support and movable support, the cylinder being fixedly connected on fixed clamp block, the movable clamp block being installed on the output end of cylinder, the first clamping slot being opened on fixed clamp block.The utility model is provided with fixed support, movable support, fixed clamp block, cylinder, movable clamp block, first clamping slot, second clamping slot and puncture needle, by starting cylinder can drive movable clamp block linearly moves, to hold cable in first clamping slot and second clamping slot inside in turn, puncture needle can penetrate cable when following movable clamp block, by puncture needle support limiting improves the antiskid property and stability of the two ends of cable installation, improves installation efficiency simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, specifically to a cable bending resistance testing device. Background Technology

[0002] The core of the cable bending resistance testing equipment is used to simulate the bending scenario of cables in actual use and to evaluate the mechanical strength and insulation reliability of cables under repeated bending. It mainly consists of four parts: sample fixing system, bending drive system, load application component, and detection feedback system. The principle revolves around the closed loop of "controllable bending - load monitoring - failure determination".

[0003] The fixing system consists of two clamping mechanisms: a fixed clamping seat at one end to ensure the cable end is secure and electrically connected (for continuity monitoring); and a movable clamping seat at the other end, which is linked to the drive system. The clamping seat has an anti-slip bushing to prevent damage to the cable's outer sheath. The bending drive system is the core execution unit, composed of a stepper motor, reducer, and eccentric wheel / crank linkage mechanism. After reduction, the motor drives the eccentric wheel to rotate, converting circular motion into the reciprocating oscillation of the movable clamping seat, achieving periodic bending of the cable around a fixed reference axis. By adjusting the eccentricity or linkage length, the bending angle can be precisely controlled to meet the testing requirements of different standards (such as GB / T5023). The load application component applies constant tension or pressure to the cable bending section using weights or force sensors, simulating the pulling and self-weight loads in actual installation, ensuring the test closely matches actual working conditions. The detection feedback system monitors key parameters in real time: a displacement sensor tracks the bending angle accuracy, a tension sensor provides feedback on load stability, and a data acquisition module records data such as the number of bends and angle changes. Finally, the bending resistance performance level is determined by the number of bends and failure modes.

[0004] Existing cable bending performance testing equipment typically requires the testing personnel to fix both ends of the cable sample to the clamping block using bolts and clamps. The friction generated by the clamps and clamping block limits the movement. The friction force on both ends of the cable is directly proportional to the clamping pressure of the clamps and clamping block. A large number of bolts may cause uneven pressure on the clamps and clamping block during installation, thus affecting the stability of the cable ends. During the test, the two ends of the cable may slip, and the number of bolts affects the installation efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is that existing cable bending performance testing equipment may cause uneven force on the cable surface and slippage and loosening when using clamps, blocks and bolts to hold the cable, and the bolt installation positioning affects the cable installation efficiency.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A cable bending resistance testing device includes a fixed bracket, one end of which is rotatably connected to a movable bracket. Clamping components are installed on both the fixed bracket and the movable bracket. The clamping components include a fixed clamping block installed on the fixed bracket and the movable bracket respectively, a cylinder fixedly connected to the fixed clamping block, a movable clamping block installed at the output end of the cylinder, a first slot opened on the fixed clamping block, a second slot opened on the movable clamping block, and a plurality of piercing needles fixedly connected to the movable clamping block. The first slot and the second slot are for clamping the cable. When the first slot drives the movable clamping block to move horizontally, it drives the piercing needles to move and pierce the cable.

[0007] The beneficial effects of this utility model are as follows: by setting a fixed bracket, a movable bracket, a fixed clamping block, a cylinder, a movable clamping block, a first slot, a second slot, and a puncture needle, the movable clamping block can be moved linearly by starting the cylinder, thereby clamping the cable in the first and second slots in sequence. The puncture needle can penetrate the cable when following the movable clamping block. The puncture needle supports and limits the installation, improving the anti-slip and stability of the cable at both ends, and improving the installation efficiency.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the puncture needles are linearly distributed, and several insertion holes are provided on the side walls of the two fixing blocks for the puncture needles to be inserted, which improves the stability of the puncture needle end support.

[0010] Furthermore, two limiting rings are fixedly connected to the side walls of the two fixing blocks near the first slot. The first slot and the limiting rings are coaxial, and the limiting rings allow the cable to pass through, which improves the convenience of cable installation and positioning.

[0011] Furthermore, a return spring is fixedly connected to the side wall of each fixed clamping block, and the other end of the return spring is fixedly connected to the movable clamping block, which improves the stability of the movement of the bottom end of the movable clamping block.

[0012] Furthermore, a damper is installed in the middle of each return spring, and the two ends of the damper are fixedly connected to the fixed clamping block and the movable clamping block, respectively.

[0013] Furthermore, a drive device is installed on the fixed bracket. The drive device includes a servo motor fixedly connected to the fixed bracket. The output end of the servo motor is fixedly connected to the movable bracket. The servo motor is used to drive the movable bracket to rotate.

[0014] Furthermore, the movable bracket is fixedly connected to the limiting wheel. In its natural state, the limiting wheel and the two fixed clamping blocks are on the same straight line. The limiting wheel has a groove for the cable to be clamped in the middle. The top of the limiting wheel is threaded with a tightening nut.

[0015] Furthermore, a mounting base is fixedly connected to the fixed bracket, and the mounting base and the fixed bracket are fixedly connected to form an integral structure. Several bolts are linearly threaded on the mounting base.

[0016] The beneficial effects of adopting the above-mentioned further solution are as follows: by setting a limit ring, the limit ring facilitates the installation and positioning of the cable. When the cylinder drives in the reverse direction, the movable clamping block and the fixed clamping block separate, and the limit ring can restrict the cable from moving with the movable clamping block, making it easier for the puncture needle to detach from the cable. By setting a return spring and a damper, when the movable clamping block holds the cable, the return spring generates elastic force on the movable clamping block, which improves the stability of the movable clamping block holding the cable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the installation structure of the fixing clamp of this utility model; Figure 5 This is a schematic diagram of the installation structure of the movable clamping block of this utility model; Figure 6 This is a schematic diagram of the unfolded structure of the fixing clamping block of this utility model; The attached diagram lists the components represented by each number as follows: 1. Fixed bracket; 2. Movable bracket; 3. Fixed clamping block; 4. Cylinder; 5. Movable clamping block; 6. Servo motor; 7. Limiting wheel; 8. First slot; 9. Limiting ring; 10. Tightening nut; 11. Mounting base; 12. Return spring; 13. Second slot; 14. Puncture needle; 15. Damper; 16. Insertion hole. Detailed Implementation

[0018] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0019] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0020] like Figure 1-6 As shown, the technical solution of this utility model to solve the above-mentioned technical problems is as follows: A cable bending resistance testing device includes a fixed bracket 1, on which a mounting base 11 is fixedly connected. The mounting base 11 and the fixed bracket 1 are both cast iron and fixedly connected to form an integral structure. Several bolts are linearly threaded on the mounting base 11, thereby improving the installation stability of the fixed bracket 1. A movable bracket 2 is rotatably connected to one end of the fixed bracket 1. Clamping components are installed on both the fixed bracket 1 and the movable bracket 2. The clamping components include a fixed clamping block 3 respectively welded to the fixed bracket 1 and the movable bracket 2, a cylinder 4 fixedly connected to the fixed clamping block 3, a movable clamping block 5 installed at the output end of the cylinder 4, a first slot 8 opened on the fixed clamping block 3, a second slot 13 opened on the movable clamping block 5, and several piercing needles 14 fixedly connected to the movable clamping block 5. The first slot 8 and the second slot 13 are for cable clamping. The first slot 8 and the second slot 13 are both arc-shaped and symmetrically distributed. The arc of the first slot 8 and the second slot 13 gradually expands from the middle to both ends. The first and second slots 8 and 13 are large, making it convenient to clamp cables of different sizes. Anti-slip grooves are provided on the inner walls of both slots 8 and 13 to increase the frictional resistance of the fixed clamping block 3 and movable clamping block 5 when clamping the cable, thereby improving clamping stability. When the first slot 8 drives the movable clamping block 5 to move horizontally, it drives the piercing needle 14 to move and pierce the cable. The piercing needles 14 are linearly distributed. Several insertion holes 16 are provided on the side walls of the two fixed clamping blocks 3 for the insertion of the piercing needles 14. It has a fixed bracket 1, a movable bracket 2, a fixed clamping block 3, a cylinder 4, a movable clamping block 5, a first slot 8, a second slot 13, and a puncture needle 14. By activating the cylinder 4, the movable clamping block 5 can be moved linearly, thereby clamping the cable in the first slot 8 and the second slot 13 in sequence. When the puncture needle 14 follows the movable clamping block 5, it can penetrate the cable sample. The cable sample is cut from the finished cable and is used for testing. The puncture needle 14 supports and limits the cable, improving the anti-slip and stability of the installation at both ends of the cable, while also improving the installation efficiency.

[0021] In practical use, this invention can also use an electric push rod to replace the cylinder 4. The electric push rod is fixedly connected to the fixed clamping block 3 by bolts. The output end of the fixed clamping block 3 is fixedly connected to the movable clamping block 5. When the cable is clamped in the first slot 8, the inspector starts the electric push rod to drive the movable clamping block 5 to move, clamping the end of the cable between the first slot 8 and the second slot 13. When the movable clamping block 5 drives the piercing needle 14 to move, the piercing needle 14 penetrates the cable, thereby improving the stability of the cable clamped between the first slot 8 and the second slot 13.

[0022] like Figure 2-6 As shown, two limiting rings 9 are fixedly connected to the side walls of the two fixed clamping blocks 3 near the first slot 8. The first slot 8 and the limiting rings 9 are located on the same axis. The limiting rings 9 allow the cable to pass through, which is convenient for the cable to be installed and positioned. When the cylinder 4 drives in the reverse direction, the movable clamping block 5 separates from the fixed clamping block 3. The limiting rings 9 can restrict the cable from moving with the movable clamping block 5, which is convenient for the puncture needle 14 to detach from the cable.

[0023] like Figure 3-6 As shown, a return spring 12 is fixedly connected to the side wall of the fixed clamping block 3. The other end of the return spring 12 is fixedly connected to the movable clamping block 5. A damper 15 is installed in the middle of the return spring 12. The two ends of the damper 15 are fixedly connected to the fixed clamping block 3 and the movable clamping block 5 respectively. When the movable clamping block 5 clamps the cable, the return spring 12 generates an elastic force on the movable clamping block 5, which improves the stability of the movable clamping block 5 in clamping the cable. At the same time, the return spring 12 absorbs and stores the impact energy, converting the violent instantaneous impact into continuous reciprocating vibration, which plays a buffering role. The damper 15 uses friction to irreversibly convert the absorbed vibration kinetic energy into heat energy and dissipate it, thereby suppressing and attenuating the vibration. The two work together, one storing energy and the other dissipating energy, to achieve efficient vibration reduction.

[0024] like Figure 1-3 As shown, a drive device is installed on the fixed bracket 1. The drive device includes a servo motor 6 that is fixedly connected to the fixed bracket 1 by bolts. The output end of the servo motor 6 is fixedly connected to the movable bracket 2 by a coupling. The servo motor 6 is used to drive the movable bracket 2 to rotate. A limit wheel 7 is fixedly connected to the movable bracket 2. In its natural state, the limit wheel 7 and the two fixed clamping blocks 3 are located on the same straight line. The limit wheel 7 has a groove for the cable to be clamped in the middle, thereby improving the stability of the cable's reciprocating bending. A tightening nut 10 is threadedly connected to the top of the limit wheel 7.

[0025] Working principle: When using this cable bending performance testing equipment, the operator first connects an external power supply, then passes one end of the cable through the middle of the first slot 8 and the limiting ring 9 in sequence. Then, the cylinder 4 is activated to drive the movable clamping block 5 to move, thereby clamping the cable in the first slot 8 and the second slot 13 in sequence. The piercing needle 14 can penetrate the cable as it follows the movable clamping block 5. The piercing needle 14 supports and limits the cable, improving the anti-slip and stability of the cable at both ends and increasing installation efficiency. The other end of the cable is installed in the same way, with the middle of the cable clamped in the groove on the limiting wheel 7. Then, the servo motor 6 is activated to drive the movable bracket 2 to rotate back and forth, thereby causing the cable to be stretched back and forth around the limiting wheel 7. By observing the cracks on the cable, the bending fatigue performance of the cable can be easily tested.

[0026] When the cable test is completed, the operator reverses the drive cylinder 4, thereby pushing the movable clamp 5 to separate from the fixed clamp 3. During separation, the puncture needle 14 is pulled out of the cable. The cable is supported and limited by the limit ring 9, thereby preventing the cable from moving with the puncture needle 14, thus improving the stability of the puncture needle 14 when it is pulled out.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the bending resistance of cables, characterized in that: The system includes a fixed bracket (1), a movable bracket (2) rotatably connected to one end of the fixed bracket (1), and clamping assemblies installed on both the fixed bracket (1) and the movable bracket (2). The clamping assemblies include a fixed clamping block (3) respectively installed on the fixed bracket (1) and the movable bracket (2), a cylinder (4) fixedly connected to the fixed clamping block (3), a movable clamping block (5) installed at the output end of the cylinder (4), a first slot (8) opened on the fixed clamping block (3), a second slot (13) opened on the movable clamping block (5), and several through-holes fixedly connected to the movable clamping block (5). The piercing needle (14), the first slot (8) and the second slot (13) are for the cable to be clamped. When the first slot (8) drives the movable clamp (5) to move horizontally, it drives the piercing needle (14) to move and pierce the cable. The piercing needle (14) is linearly distributed. Several insertion holes (16) are opened on the side walls of the two fixed clamps (3). The insertion holes (16) are for the piercing needle (14) to be inserted. Two limiting rings (9) are fixedly connected to the side walls of the two fixed clamps (3) near the first slot (8). The first slot (8) and the limiting rings (9) are located on the same axis. The limiting rings (9) are for the cable to be inserted.

2. The cable bending resistance testing equipment according to claim 1, characterized in that, Each fixed clamp (3) has a reset spring (12) fixedly connected to its side wall, and the other end of the reset spring (12) is fixedly connected to the movable clamp (5).

3. The cable bending resistance testing equipment according to claim 2, characterized in that, Each of the return springs (12) has a damper (15) installed in the middle. The two ends of the damper (15) are fixedly connected to the fixed clamp (3) and the movable clamp (5) respectively.

4. The cable bending resistance testing equipment according to claim 1, characterized in that, A drive device is installed on the fixed bracket (1). The drive device includes a servo motor (6) fixedly connected to the fixed bracket (1). The output end of the servo motor (6) is fixedly connected to the movable bracket (2). The servo motor (6) is used to drive the movable bracket (2) to rotate.

5. The cable bending resistance testing equipment according to claim 4, characterized in that, The movable bracket (2) is fixedly connected to the limiting wheel (7). In its natural state, the limiting wheel (7) and the two fixed clamps (3) are on the same straight line. The limiting wheel (7) has a groove for the cable to be clamped in the middle. The top of the limiting wheel (7) is threaded with a tightening nut (10).

6. The cable bending resistance testing device according to claim 4, characterized in that, A mounting base (11) is fixedly connected to the fixed bracket (1). The mounting base (11) and the fixed bracket (1) are fixedly connected to form an integral structure. Several bolts are linearly threaded on the mounting base (11).

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