Swing type bending fatigue testing device for small-diameter single-wire conductor

Abstract

The utility model relates to a swinging type bending fatigue testing device for a small-diameter single-wire conductor. The swinging type bending fatigue testing device comprises a bracket, a driving mechanism, a swinging rod, a connecting rod assembly and a counter weight, a swing rod rotating shaft is arranged on one side of the cross beam; the upper end of the swing rod is rotationally connected to the swing rod rotating shaft, the middle of the swing rod is connected with one end of the connecting rod assembly, and the other end of the connecting rod assembly is connected with a power output shaft of the driving mechanism arranged on the cross beam. The driving mechanism drives the swing rod to swing left and right with the swing rod rotating shaft as the center through the connecting rod assembly. A to-be-tested single-wire conductor is fixed at the lower end of the swing rod, and the lower end of the single-wire conductor is suspended and connected with a counterweight; a counter and a magnetic induction sensor are further arranged on the cross beam, the magnetic induction sensor is in signal connection with the counter, and the magnetic induction sensor is located on a swing path of the swing rod and located under a rotating shaft of the swing rod. According to the utility model, the bending fatigue test of the small-diameter single-wire conductor can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wire performance detection, specifically relates to a swing type bending fatigue test device of fine diameter single wire conductor. BACKGROUND

[0002] New energy high voltage harness design is strict, needs to satisfy current, voltage, safety, reliability and durability requirement. The design of conductor, insulation, shielding, thermal management, connector and safety is very important, needs to meet international standard, supports the efficient and safe operation of electric vehicle and energy storage system. The conductor is one of the core components of high voltage harness, and the material and cross section design directly determines the current carrying capacity and thermal management capacity of the harness.

[0003] Under the lightweight design trend of new energy vehicles, new energy vehicle harness also needs to be designed lightweight. In order to meet the performance requirements, the development direction of high voltage harness: 1, single wire core high voltage harness begins to develop to multi-core harness; 2, in order to reduce the skin effect, the diameter of single wire conductor is continuously reduced, and at the same time, the tensile strength, electrical conductivity and bending fatigue performance of single wire conductor are continuously improved.

[0004] The existing bending fatigue performance testing machine is mainly for cable, and the cable is the finished product after the single wire conductor is twisted and the insulation layer, shielding layer and sheath are added. However, with the strict safety performance requirements of new energy vehicles, the bending performance of single wire conductor is required to be systematically evaluated. However, the diameter of single wire conductor for automobile harness can be 0.01mm, and the existing bending fatigue test device cannot carry out the bending fatigue performance test and related research work of ultra-fine diameter single wire conductor. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a swing type bending fatigue test device of fine diameter single wire conductor, which can realize the bending fatigue test of fine diameter single wire conductor with a diameter of 0.05mm to 1mm.

[0006] In order to realize the above purpose, the utility model adopts the technical scheme of a swing type bending fatigue test device of fine diameter single wire conductor, which comprises a support, a driving mechanism, a swing rod, a connecting rod assembly and a counterweight.

[0007] The support is provided with a cross beam, and the cross beam is provided with a swing rod rotating shaft on one side; the upper end of the swing rod is rotatably connected to the swing rod rotating shaft, the middle part of the swing rod is connected to one end of the connecting rod assembly, the other end of the connecting rod assembly is connected to the power output shaft of the driving mechanism, and the driving mechanism is arranged on the cross beam; the driving mechanism drives the swing rod to swing left and right around the swing rod rotating shaft through the connecting rod assembly.

[0008] The single-wire conductor to be tested is fixed at the lower end of the swing rod, and the lower end of the single-wire conductor is hung with the counterweight;

[0009] The cross beam is further provided with a counter and a magnetic induction sensor, and the magnetic induction sensor is located on the swing path of the swing rod and directly below the rotation shaft of the swing rod.

[0010] Further, the linkage assembly comprises a driving rod and a connecting rod, one end of the driving rod is fixedly connected to the power output shaft, one end of the connecting rod is rotatably connected to the driving rod through a first connecting rotation shaft, and the other end of the connecting rod is rotatably connected to the swing rod through a second connecting rotation shaft.

[0011] Further, the driving rod is provided with a sliding groove extending along the length direction of the driving rod, and the first connecting rotation shaft is slidably arranged in the sliding groove and fixed by a locking nut.

[0012] Further, one side or both sides of the sliding groove are provided with a length scale.

[0013] Further, the lower part of the swing rod is provided with a clamping head for clamping the single-wire conductor.

[0014] Further, the clamping head comprises a fixed part and a movable part, the fixed part is an integral structure with the rod body of the swing rod, the movable part is connected to the fixed part through a compression bolt, and the single-wire conductor is clamped by the movable part and the fixed part after the compression bolt is tightened.

[0015] Further, the clamping head is provided with a micro groove for the copper wire conductor to pass through, and the micro groove is formed by the half-grooves arranged on the fixed part and the movable part.

[0016] Further, the rod body of the swing rod is further provided with a fixing screw, and the upper end of the single-wire conductor is wound on the fixing screw.

[0017] Further, the driving mechanism comprises a driving motor and a speed reducer, and the power output shaft is arranged on the speed reducer.

[0018] Further, the driving motor is a variable frequency motor, and the support is provided with a control switch for controlling the start and stop of the driving mechanism and adjusting the rotation speed of the driving motor.

[0019] The beneficial effects of the utility model are that the utility model realizes the bending fatigue test of the single-wire conductor with thin diameter by the cooperation of the linkage assembly and the swing rod, and the symmetrical bending in the test process can be realized.

[0020] The clamping head of the swing rod can firmly clamp the single-wire conductor, avoids sliding of the single-wire conductor, ensures that the bending position of the single-wire conductor is not changed during the test, and further ensures the accuracy and reliability of the test result.

[0021] The swing amplitude of the swing rod can be adjusted by adjusting the position of the connecting rod on the driving rod, the bending angle of the single-wire conductor is adjusted, different test requirements are met, and the utility model has a larger application range. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0023] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0024] Figure 2 It is a structure schematic view of the connecting rod assembly in the utility model;

[0025] Figure 3 It is a structure schematic view of the swing rod part in the utility model;

[0026] Figure 4 It is a structure schematic view of the swing rod left and right swing and bending test angle in the utility model;

[0027] Marked in the figure: 1, base, 2, stand, 3, crossbeam, 4, counter display screen, 5, power output shaft, 6, driving rod, 601, sliding slot, 602, shaft hole, 7, connecting rod, 8, swing rod, 801, clamping head, 802, fixed part, 803, movable part, 804, micro groove, 805, compression bolt, 806, fixed screw, 9, swing rod rotating shaft, 10, probe, 11, weight, 12, copper wire conductor, 13, first connecting rotating shaft, 14, second connecting rotating shaft, 15, controller switch. DETAILED DESCRIPTION

[0028] The utility model will be further explained in detail in combination with the drawings and embodiments, but it is not as the basis for any limitation of the utility model.

[0029] As Figure 1 Indicated, a kind of swing type bending fatigue test device of fine diameter single-wire conductor, including support, driving mechanism, swing rod 8, connecting rod assembly and weight 11.

[0030] The support frame comprises a base 1 at the bottom, two vertical columns 2 fixed on the base 1, and a crossbeam 3 supported on the top of the two vertical columns 2. The vertical columns 2 and the crossbeam 3 form a structure like a portal frame, which provides reliable support for the test.

[0031] A swing rod rotating shaft 9 is arranged on the first side of the crossbeam 3, and the upper part of the swing rod 8 is rotatably connected to the swing rod rotating shaft 9 and can swing left and right under the action of external force.

[0032] The linkage assembly comprises a driving rod 6 and a connecting rod 7. One end of the driving rod 6 is fixedly connected to the power output shaft 5 of the driving mechanism, and the other end of the driving rod 6 is rotatably connected to one end of the connecting rod 7 through a first connecting rotating shaft 13. The other end of the connecting rod 7 is rotatably connected to the middle part of the swing rod 8 through a second connecting rotating shaft 14. The driving mechanism is fixed on the second side of the crossbeam 3, and the driving mechanism comprises a driving motor and a speed reducer. The power output shaft of the speed reducer penetrates through the crossbeam 3 and extends out from the first side. After the driving motor and the speed reducer are started, the driving motor and the speed reducer drive the driving rod 6 to rotate 360° in the vertical plane, and the driving rod 6 drives the swing rod 8 to swing left and right around the swing rod rotating shaft 9 through the connecting rod 7.

[0033] The lower part of the swing rod 8 is fixed with a fine single-wire conductor to be tested. In this embodiment, the fine single-wire conductor to be tested is a copper wire conductor 12 with a diameter of 0.05 mm. The end of the copper wire conductor 12 is connected to a weight 11, and the copper wire conductor 12 is tensioned by the weight 11. In the process of swinging of the swing rod 8, the copper wire conductor 12 is bent under the traction of the weight 11, and the copper wire conductor 12 is bent once for each swing of the swing rod 8. In other embodiments, other counterweights can be used instead of the weight 11.

[0034] A magnetic induction sensor 10 for detecting the number of swings is further arranged on the crossbeam 3. The magnetic induction sensor 10 is signal-connected to a counter arranged on the crossbeam 3, and the counter displays the measured number of swings on a counter display screen 4. The counter counts once for each passing of the swing rod 8 through the magnetic induction sensor 10, indicating that the copper wire conductor 12 is bent once. Therefore, the number of bends of the copper wire conductor 12 can be obtained according to the display result of the counter.

[0035] Preferably, the magnetic induction sensor 10 is located directly below the swing rod rotating shaft 9, i.e. the line connecting the swing rod rotating shaft 9 and the magnetic induction sensor 10 is a plumb line.

[0036] Further, the driving motor is a variable frequency motor, and a control switch 15 is arranged on the base 1 and connected to the driving motor, for controlling the start and stop of the driving motor and adjusting the rotating speed of the driving motor, so as to change the swing frequency of the swing rod 8.

[0037] Preferred, such as Figure 2 As shown, in order to adjust the swing amplitude of the rocker arm 8, the drive rod 6 is provided with a groove 601 extending along the length of the rod body. The first connecting shaft 13 is slidably disposed in the groove 601, and the groove 601 is located at the center line position of the drive rod 6. The power output shaft 5 is connected to the shaft hole 602 at the center line position of the drive rod 6.

[0038] More preferably, a locking nut is provided on the first connecting shaft 13. After the locking nut is tightened, the first connecting shaft 13 can be fixed at any position in the slide groove. The connecting rod is sleeved on the outside of the locking nut, and a positioning pin is provided at the end of the first connecting shaft 13 to prevent the connecting rod 7 from falling off the first connecting shaft 13.

[0039] The distance between the first connecting shaft 13 and the power output shaft 5 can be adjusted by sliding the first connecting shaft 13 in the slide groove, thus adjusting the swing amplitude of the rocker arm 8. Due to the deceleration of the reducer, the rocker arm 8 swings at a relatively slow speed, and the copper wire conductor 12 remains basically vertical under the traction of the weight 11. Therefore, if... Figure 3 As shown, the rocker arm 8 swings to its extreme position on the left or right ( Figure 4 When the dotted line L1 or L2 is used, the angle α between the copper wire conductor 12 and the rocker arm 8 is the bending angle of the copper wire conductor 12. This angle α is also equal to the angle between the rocker arm 8 when it swings to its limit position to the left or right and its initial position. Figure 4 The included angle (shown by the dashed line L0). In this embodiment, the adjustment range of this included angle α is 20~60°, that is, the bending angle of the copper wire conductor 12 is 20~60°.

[0040] Furthermore, preferably, the drive rod 6 has a length scale (not shown in the figure) at the groove 601 to indicate the distance between the first connecting shaft 13 and the power output shaft 5. The swing amplitude of the rocker arm 8, i.e., the size of the included angle α, can then be determined based on the length scale value corresponding to the first connecting shaft 13. The correspondence between the length scale value and the included angle α can be determined through multiple experiments, and a length-angle relationship table can be established. During subsequent experiments, the size of the included angle α can be directly obtained by looking it up.

[0041] Specifically, such as Figure 3As shown, a clamping head 801 is provided at the lower part of the rocker arm 8, and the width of the clamping head 801 is greater than the width of the upper part of the rocker arm 8. The clamping head 801 includes a fixed part 802 and a movable part 803. The fixed part 802 is an integral structure with the rocker arm 8, and the movable part 803 is connected to the fixed part 802 by a clamping bolt 805. The clamping head 801 is provided with a microgroove 804 for the copper wire conductor 12 to pass through. The microgroove 804 is formed by the mating of half-grooves provided on the fixed part 802 and the movable part 803. In this embodiment, the diameter of the microgroove 804 is less than 0.05 mm to clamp the copper wire conductor 12. After the copper wire conductor 12 passes through the microgroove 804, the clamping bolt 805 tightens the movable part 803 and the fixed part 802, clamping the copper wire conductor 12 in the microgroove 804 to prevent the copper wire conductor 12 from sliding laterally during the test.

[0042] In a further preferred embodiment, the rocker arm 8 is also provided with a fixing screw 806, the upper end of the copper wire conductor 12 is wound around the fixing screw 806, and the copper wire conductor 12 is reliably fixed by tightening the fixing screw 806 to avoid slippage due to the pull of the weight 11.

[0043] Based on the above structure, the following describes the usage process of this utility model using the bending fatigue test of the copper wire conductor 12 as an example. The test includes the following steps:

[0044] First, adjust the distance between the first connecting shaft 13 and the power output shaft 5, and fix the first connecting shaft 13. Determine the bending angle of the copper wire conductor 12 by consulting the length-angle relationship table.

[0045] The second step is to wrap one end of the copper wire conductor 12 around the fixing screw 806 and tighten the fixing screw 806. Then, pass the other end of the copper wire conductor 12 through the micro-groove 804 of the clamping head 801 and tighten the clamping bolt 805 on the clamping head 801 to clamp the copper wire conductor 12.

[0046] The third step is to connect one end of the copper wire conductor 12 that extends out of the clamping head 801 to the selected weight 11. The weight 11 has a hook or connecting hole and the weight range of the weight 11 is 10~50g.

[0047] Fourth step, turn on the counter and reset it to zero;

[0048] Fifth step, turn on the control switch 15 on the base 1, adjust the knob position of the control switch 15 to set the swing frequency of the rocker arm 8, the rocker arm 8 swings left and right under the drive mechanism and the connecting rod assembly to perform the bending fatigue test of the copper wire conductor 12; when the copper wire conductor 12 breaks, turn off the control switch 15, and record the swing frequency and swing number of the rocker arm 8. The number of swings is the number of times the copper wire conductor 12 breaks due to bending.

[0049] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the specific implementation of this utility model with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model are within the protection scope of the pending claims.

Claims

1. A device for testing the bending fatigue of a fine single wire conductor of the oscillating type, characterized by: The support, the driving mechanism, the swing rod, the connecting rod assembly and the counterweight are included. The support is provided with a crossbeam, and a swing rod rotating shaft is arranged on one side of the crossbeam; the upper end of the swing rod is rotationally connected to the swing rod rotating shaft; the middle part of the swing rod is connected to one end of the connecting rod assembly; the other end of the connecting rod assembly is connected to the power output shaft of the driving mechanism; and the driving mechanism is arranged on the crossbeam; the driving mechanism drives the swing rod to swing left and right around the swing rod rotating shaft through the connecting rod assembly. The single-wire conductor to be tested is fixed to the lower end of the swing rod, and the lower end of the single-wire conductor is hung to the counterweight. The crossbeam is further provided with a counter and a magnetic induction sensor, and the magnetic induction sensor is signal-connected to the counter; the magnetic induction sensor is located on the swing path of the swing rod and directly below the swing rod rotating shaft.

2. The bending fatigue testing apparatus of claim 1, wherein: The connecting rod assembly includes a driving rod and a connecting rod; one end of the driving rod is fixedly connected to the power output shaft; one end of the connecting rod is rotationally connected to the driving rod through a first connecting rotating shaft; and the other end of the connecting rod is rotationally connected to the swing rod through a second connecting rotating shaft.

3. The bending fatigue testing apparatus of claim 2, wherein: The driving rod is provided with a sliding groove extending along the length direction of the driving rod; the first connecting rotating shaft is slidingly arranged in the sliding groove and is fixed by a locking nut.

4. The bending fatigue testing apparatus of claim 3, wherein: One side or both sides of the sliding groove are provided with a length scale.

5. The bending fatigue test apparatus of claim 1, wherein: The lower part of the swing rod is provided with a clamping head for clamping the single-wire conductor.

6. The bending fatigue testing apparatus of claim 5, wherein: The clamping head includes a fixed part and a movable part; the fixed part is an integral structure with the rod body of the swing rod; the movable part is connected to the fixed part through a compression bolt; and the single-wire conductor is clamped by the movable part and the fixed part after the compression bolt is tightened.

7. The bending fatigue testing apparatus of claim 6, wherein: The clamping head is provided with a micro groove for the copper wire conductor to pass through; the micro groove is formed by the half-grooves arranged on the fixed part and the movable part.

8. A bending fatigue test apparatus of the oscillating type according to any one of claims 5 to 7, characterized in that: The rod body of the swing rod is further provided with a fixing screw, and the upper end of the single-wire conductor is wound around the fixing screw.

9. The bending fatigue test apparatus of claim 1, wherein: The driving mechanism includes a driving motor and a speed reducer, and the power output shaft is arranged on the speed reducer.

10. The bending fatigue test apparatus of claim 9, wherein: The driving motor is a variable frequency motor, and the support is provided with a control switch for controlling the start and stop of the driving mechanism and adjusting the rotating speed of the driving motor.

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