CN113029815A - Automobile cable flexibility bending force test fixture - Google Patents
Automobile cable flexibility bending force test fixture Download PDFInfo
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- CN113029815A CN113029815A CN202110411832.2A CN202110411832A CN113029815A CN 113029815 A CN113029815 A CN 113029815A CN 202110411832 A CN202110411832 A CN 202110411832A CN 113029815 A CN113029815 A CN 113029815A
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- frame body
- cable
- reel
- bending force
- tape reel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
Abstract
The invention discloses a flexibility and bending force testing clamp for an automobile cable, which belongs to the technical field of cable testing equipment and comprises an upper frame body and a lower frame body, wherein the lower part of the upper frame body is provided with a lower tape reel with a horizontal axis, the upper part of the upper frame body is provided with an upper tape reel with an axis parallel to the lower tape reel, the upper tape reel and the lower tape reel are formed by winding the same tape reel, the upper frame body is provided with an upper positioning pin for limiting the rotation of the upper tape reel and a lower positioning pin for limiting the rotation of the lower tape reel, the mounting axis of the lower frame body is parallel to the axes of the upper tape reel and the lower tape reel and is provided with two pulleys on the same horizontal plane, the two pulleys are respectively positioned on two sides below the lower tape reel, and the pulleys are. The clamp can test the bending force of the cable in a certain bending state more accurately, obtains more accurate bending force numerical values, and is beneficial to research, development or comparison of softness of the cable.
Description
Technical Field
The invention belongs to the technical field of cable test equipment, and particularly relates to a clamp for testing flexibility and bending force of an automobile cable.
Background
The automobile cable is used as a special cable, is mainly used in an automobile and is used as a bridge for connecting various electric devices. Because the space for installing and working the automobile cable is narrow, the requirement on the flexibility of the cable is high.
Although softness of the automobile cable is an important index for measuring performance and quality of the automobile cable, how to quantitatively test the softness value of the automobile cable is still a difficult problem in the automobile industry at present. The factors causing the testing difficulty are that the types of the automobile cables are various, and the types are mainly expressed in the following aspects:
1. the diameter of the automobile cable is changed greatly, and the diameter of the common specification is different from 1mm to 30 mm;
2. the automobile cable has various nominal sectional area sizes and models, and the range is 0.13mm2～120mm2；
3. The conductor composition of the cable with the same nominal section is also greatly different, and the cable is generally divided into 2-4 types, such as 70mm2Nominal cross-section cables with monofilament diameters of 0.2mm, 0.4mm and 0.8mm, etc.;
4. according to the requirements of use occasions, the selected insulating materials and the selected insulating thicknesses are different, and if silicone rubber materials with Shore A65 hardness, polyolefin and polyvinyl chloride materials with Shore 90A effect in the middle and high-hardness fluoroplastics are selected;
5. the bending radius also differs greatly depending on the characteristics of the cable. From 5 times to 10 times also vary widely.
The above-mentioned distinctive characteristics of different cables lead to an indefinite magnitude of the bending force (flexibility) of the automotive cable and also restrict the quantitative measurement of the bending force of the cable.
At present, two main methods for measuring the bending property of the automobile cable at home and abroad are as follows: respectively 5.3.5 flexibility test in ISO 19642.2 standard and 9.3.4 cable bending strength test in popular VW 60306-1.
The 5.3.5 flexibility test device and method in the ISO 19642.2 standard are as follows:
the test device comprises two groups of optional clamps, the structure of the clamps is shown in figure 5, and each clamp mainly comprises three parts: the pulley block comprises a lower support, three pulley blocks and an upper support, wherein the lower support is provided with two lower pulleys with adjustable center distance in bilateral symmetry, and the upper support is provided with an upper pulley positioned above the middle of the two lower pulleys. The upper bracket is arranged on an upper fixture of the electronic tension tester, the lower bracket is arranged on a lower fixture of the electronic tension tester, during testing, a cable with a certain length is intercepted to be used as a test cable, and the test cable is placed on the two lower pulleys. The bending force test is carried out on the cable in a mode that the cable is bent downwards through the upper pulley, and the following table shows test data tables aiming at different cable outer diameters:
the test divides the cable into 8 ranges according to the outer diameter of the cable, and specifies the diameter, center distance and the like of pulleys required in the clamp. The data calculation shows that the tested cable requires the measurement of bending force at the bending radius of 3.33D-4.4D. The maximum difference of the bending radius of different cable diameters in the same cable outer diameter range is about 0.8-0.9D, and the bending radius proportion cannot be accurately selected according to the outer diameter of the cable or the nominal maximum outer diameter. Meanwhile, in the actual use process, many cables cannot meet the requirement of about 3.33-4.4D due to the fact that the insulating materials of the cables are hard, and even if the cables can be measured, no practical significance is provided. And the practical experiment proves that the bending force of the same cable under different bending radii is different.
Cable bending strength test 9.3.4 in the popular group VW 60306-1 standard: the testing device is shown in fig. 6, and the standard is that the maximum upper limit value of the angle is specified according to the actual using angle of the cable and the experience of vehicle manufacturing for many years. The flexibility of the cable cannot be compared, and the flexibility test for the cable cannot be carried out.
In conclusion, the bending force test schemes of the two main flow cables have the defects of inaccurate bending radius proportion and poor test precision, and cannot meet the test requirements of cable production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the automobile cable flexibility bending force test clamp for solving the problem of inaccurate cable bending force test.
The invention is realized in this way, a car cable flexibility bending force test fixture, its characteristic is: comprises an upper frame body and a lower frame body.
The lower part of going up the support body is installed the lower tape reel of axis level, the upper portion installation axis of going up the support body is with the upper tape reel that is parallel down the tape reel, upper tape reel and lower tape reel are formed by same wire rod winding, go up the support body installation and be used for restricting the upper locating pin of upper tape reel pivoted and be used for restricting down the lower locating pin of tape reel pivoted.
Lower support body installation axis with go up the parallel and two pulleys that are located same horizontal plane of axis of dish and lower dish, two the pulley is located lower dish below both sides respectively, but the pulley is installed with lateral adjustment's mode on the lower support body.
The clamp disclosed by the invention is arranged on an electronic tension test device, the test bending radius of a cable is determined by the radius of the lower tape reel, and the radius of the lower tape reel can be adjusted by taking the thickness of the tape reel as a minimum condition unit, so that the clamp can accurately control the bending radius of the cable, the bending force value of the automobile cable at a certain bending radius can be accurately measured, the test result is more accurate than that of eight pulley blocks in the traditional test standard (ISO 19642), and the requirement of automobile and cable manufacturers on the flexibility quantification of the cable is met. For cable manufacturers, the tested data can be analyzed, and the flexibility of the cable is improved by changing the hardness of the material, the extrusion tightness, the copper wire annealing process, the stranded wire processing process and the like.
In the above technical scheme, preferably, the upper frame body is provided with an upper crank capable of driving the upper reel to rotate, and the upper frame body is provided with a lower crank capable of driving the lower reel to rotate.
In the above technical solution, preferably, the pulley is a V-shaped sheave.
In the above technical solution, preferably, the lower frame body has a horizontal sliding groove, two sliding blocks capable of moving along the horizontal sliding groove are installed in the horizontal sliding groove, two pulleys are installed on the two sliding blocks respectively, and the lower frame body is provided with two horizontal adjusting screws for adjusting the horizontal positions of the two sliding blocks respectively.
In the above technical scheme, preferably, the upper frame body is provided with a vertical guide portion, and the lower frame body is provided with a vertical guide groove combined with the vertical guide portion.
In the above technical solution, preferably, the coil belt is a stainless steel belt with a thickness of 0.25 mm.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an upper frame body according to the present invention;
FIG. 3 is a schematic structural view of the lower frame body according to the present invention;
FIG. 4 is a schematic view of the mounting structure of the lateral adjusting screw of the present invention;
FIG. 5 is a schematic diagram of the structure of the test device in the ISO 19642.2 standard;
FIG. 6 is a schematic diagram showing the structure of the test apparatus in the VW 60306-1 standard.
In the drawing, 1, an upper frame body; 2. a lower frame body; 2-1, a transverse chute; 2-2, vertical guide grooves; 3. a lower reel; 4. a tape feeding reel; 5. an upper positioning pin; 6. a lower locating pin; 7. an upper crank; 8. a lower crank; 9. a pulley; 10. a slider; 11. a transverse adjusting screw; 12. and (5) positioning the blocks.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the problem of inaccurate cable bending force test, the invention particularly provides an automobile cable flexibility bending force test fixture, which can test the bending force of a cable in a certain bending state more accurately, obtain more accurate bending force values and is beneficial to research and development or comparison of cable flexibility. To further illustrate the structure of the present invention, the following detailed description is made with reference to the accompanying drawings:
referring to fig. 1 to 4, a clamp for testing flexibility and bending force of a cable of an automobile includes an upper frame 1 and a lower frame 2.
The lower part of the upper frame body 1 is provided with a lower reel 3 with a horizontal axis, the upper part of the upper frame body 1 is provided with an upper reel 4 with an axis parallel to the lower reel 3, and the upper reel 4 and the lower reel 3 are formed by winding the same reel. The upper frame body 1 is provided with an upper positioning pin 5 for limiting the rotation of the upper reel 4 and a lower positioning pin 6 for limiting the rotation of the lower reel 3.
In this embodiment, the upper frame body 1 is a vertically extending stainless steel frame body having a slot penetrating in a lateral direction and having an opening at a lower end. The lower part of the slot of the upper frame body 1 is provided with a lower rotating shaft which can rotate around the axis of the lower rotating shaft through a bearing, and the upper part of the slot of the upper frame body 1 is provided with an upper rotating shaft which can rotate around the axis of the upper rotating shaft through a bearing. The tep reel is the stainless steel band that thickness is 0.25mm, and the tip is fixed on last pivot and lower pivot through the screw respectively, and twines upper band dish 4 and lower tep reel 3 for the disc shape on last pivot and lower pivot, through rotating upper pivot and lower pivot, the number of piles of the tep reel of adjustable twining in two pivots is adjusted down to the diameter of tep reel 3 through this mode, and lower tep reel 3 is as the disk body of roof pressure cable downwards in the test procedure, and upper band dish 4 forms for the reserve tep reel. In this embodiment, the disk tape is wound between the upper rotating shaft and the lower rotating shaft in an S-shape. The upper end of the upper frame body 1 is provided with a mounting hole for connecting with an upper mounting tool of a gantry type electronic tensile testing machine.
In order to facilitate the rotation adjustment of the lower reel 3, the upper frame body 1 is provided with an upper crank 7 which can drive the upper reel 4 to rotate, and the upper frame body 1 is provided with a lower crank 8 which can drive the lower reel 3 to rotate. The upper crank 7 is directly connected with the shaft end of the upper rotating shaft, and the lower crank 8 is directly connected with the shaft end of the lower rotating shaft. In this embodiment, the upper positioning pin 5 and the lower positioning pin 6 are the fixture block structure of the isosceles triangle block, that is, the circumferential latch is provided at the shaft ends of the upper rotating shaft and the lower rotating shaft, the upper positioning pin 5 and the lower positioning pin 6 are provided near the corresponding shaft ends of the upper rotating shaft and the lower rotating shaft, and are detachably inserted into the upper frame body 1 through the insertion holes, and the latch is provided at the bottom end faces of the upper positioning pin 5 and the lower positioning pin 6. The combination of the upper positioning pin 5 and the upper rotating shaft is taken as an example, after the top end side part of the upper positioning pin 5 is inserted into the upper frame body 1 through an integrated pin rod, the center position of the bottom end surface of the upper positioning pin 5 is combined with the outer peripheral surface of the shaft end of the upper rotating shaft through a latch, and therefore the circumferential direction of the upper rotating shaft is locked. The cross-sections of the pin rod of the upper positioning pin 5 and the jack combined with the pin rod of the upper frame body 1 can be designed into non-circular structures, and can also play a role in locking. Conventionally, there are various types of locking structures for the circumferential direction of the rotating shaft in the known art, and the above is merely an example of a structure for locking the circumferential direction of the upper rotating shaft and the lower rotating shaft, but is not limited thereto.
The lower frame body 2 is provided with two pulleys 9 with the axes parallel to the axes of the upper reel 4 and the lower reel 3, and the axes of the two pulleys 9 are positioned on the same horizontal plane. Two pulleys 9 are respectively positioned at two sides below the lower belt disc 3, and the pulleys 9 are arranged on the lower frame body 2 in a transverse adjustable mode. Specifically, in this embodiment, the lower frame body 2 is a T-shaped stainless steel frame body, the upper portion of the lower frame body 2 is provided with a transverse sliding groove 2-1, and two sliding blocks 10 which can move along the transverse sliding groove are installed in the transverse sliding groove 2-1. The two pulleys 9 are respectively arranged on the two sliding blocks 10, and the adjustment of the transverse positions and the center distance of the two pulleys 9 can be realized through the movable movement of the sliding blocks 10 in the transverse sliding grooves 2-1. The lower frame body 2 is provided with two transverse adjusting screw rods 11 which are respectively used for adjusting the transverse positions of the two sliding blocks 10. The two sides of the lower frame body 2 are fixed with positioning blocks 12, the positioning blocks 12 are fixed in the transverse sliding grooves 2-1 by screws, the positioning blocks 12 are provided with transverse through holes, the transverse adjusting screw 11 penetrates through the through holes of the positioning blocks 12, and the transverse adjusting screw 11 is provided with a limiting flange which limits the transverse adjusting screw to move relative to the positioning blocks 12 in the axial direction. The slider 10 is fitted by means of a thread on a transverse adjusting screw 11. Because the cross sections of the transverse sliding groove 2-1 and the sliding block 10 are non-circular, the position of the sliding block 10 in the transverse sliding groove 2-1 can be adjusted by rotating a knob of the transverse adjusting screw rod 11.
The specific use method of the clamp is as follows:
the fixture is arranged on a gantry type universal tensile testing machine.
At 70mm2Example of a CableBending force at a bending radius of 5D:
1. the measuring cable diameter was 20 mm.
2. The bend radius was calculated to be 100mm for 5 cable diameters and 200mm for bend diameters.
3. Rotating the upper crank, adjusting the diameter of the upper belt disc, and fixing the upper belt disc and the lower belt disc when the diameter of the upper belt disc is measured by a caliper of 0-300 mm to be 200 mm.
4. The control upper bracket body moves down, and the lower band dish moves to center and pulley center level (as shown in fig. 6), puts into the measured cable between lower band dish side and pulley, and the cable is vertical to be placed, adjusts horizontal adjusting screw's knob to lower band dish and pulley and cable contact, can drive the pulley rotation gently during cable vertical movement, adjusts the pulley of lower band dish opposite side like this. After the adjustment is finished, the upper frame body moves upwards, and the lower belt disc moves to the upper part of the two pulleys.
5. The cable to be tested was cut to a length of 1.5 times the bending diameter as a test cable, i.e. 300mm (200mm 150%). The cable is horizontally placed on the two pulleys in the middle, and two end parts of the cable are respectively supported on the two pulleys.
6. And starting the tension tester, moving the upper frame body downwards at the speed of 100mm/min and jacking the cable, extruding and bending the cable until the two ends of the cable are completely vertical and fall off from the two pulleys, and obtaining the maximum value of the bending force of the tested cable through the tension tester.
By means of the clamp, the bending radius of the cable can be accurately set and controlled, even if the diameter of the cable changes by 0.1mm and the bending radius changes by 0.5mm, a lower coil belt with the diameter matched with the diameter can be obtained by adjusting the winding of the coil belt, and the accuracy of a test result is guaranteed. The rotatable pulley can eliminate the test error caused by sliding friction in the process of pressing the cable.
In this embodiment, the pulley 9 is a V-sheave. The V-shaped groove structure is adopted, so that the cable is embedded into the pulley, and the vertical bending of the cable in the bending process is ensured. The upper frame body 1 is provided with a vertical guide part, and the lower frame body is provided with a vertical guide groove 2-2 combined with the vertical guide part. The vertical guide part is the rear side part of the upper frame, and the vertical guide groove 2-2 is a vertically extending long groove with the width slightly larger than that of the rear side of the upper frame body. The structure can ensure the relative stability of the upper frame body and the lower frame body in the downward moving process, so that the measurement is vertical and accurate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides an automobile cable compliance bending force test fixture which characterized in that: comprises an upper frame body (1) and a lower frame body (2);
the lower part of the upper frame body (1) is provided with a lower belt reel (3) with a horizontal axis, the upper part of the upper frame body (1) is provided with an upper belt reel (4) with an axis parallel to the lower belt reel (3), the upper belt reel (4) and the lower belt reel (3) are formed by winding the same belt, and the upper frame body (1) is provided with an upper positioning pin (5) for limiting the rotation of the upper belt reel (4) and a lower positioning pin (6) for limiting the rotation of the lower belt reel (3);
lower support body (2) installation axis with go up the axis parallel of tep reel (4) and lower reel (3) and be located two pulleys (9) on same horizontal plane, two pulley (9) are located lower reel (3) below both sides respectively, but pulley (9) are installed with lateral adjustment's mode on lower support body (2).
2. The automotive cable flexibility bending force test fixture of claim 1, wherein: go up support body (1) installation can drive go up reel (4) pivoted upper crank (7), go up support body (1) installation can drive lower reel (3) pivoted lower crank (8).
3. The automotive cable flexibility bending force test fixture of claim 1, wherein: the pulley (9) is a V-shaped grooved pulley.
4. The automotive cable flexibility bending force test fixture of claim 1, wherein: the lower frame body (2) is provided with a transverse sliding groove (2-1), two sliding blocks (10) which can move along the transverse sliding groove are installed in the transverse sliding groove (2-1), two pulleys (9) are installed on the two sliding blocks (10) respectively, and two transverse adjusting screw rods (11) which are used for adjusting the transverse positions of the two sliding blocks (10) are installed on the lower frame body (2) respectively.
5. The automotive cable flexibility bending force test fixture of claim 4, wherein: the upper frame body (1) is provided with a vertical guide part, and the lower frame body (2) is provided with a vertical guide groove (2-2) combined with the vertical guide part.
6. The clamp for testing the bending force of the automobile cable according to claim 1, wherein: the coil belt is a stainless steel belt with the thickness of 0.25 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110411832.2A CN113029815A (en) | 2021-04-16 | 2021-04-16 | Automobile cable flexibility bending force test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110411832.2A CN113029815A (en) | 2021-04-16 | 2021-04-16 | Automobile cable flexibility bending force test fixture |
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| Publication Number | Publication Date |
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| CN113029815A true CN113029815A (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110411832.2A Pending CN113029815A (en) | 2021-04-16 | 2021-04-16 | Automobile cable flexibility bending force test fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007442A (en) * | 2023-09-28 | 2023-11-07 | 广东新亚光电缆股份有限公司 | Protective sleeve flexibility degree detection system of insulating flat flexible cable |
-
2021
- 2021-04-16 CN CN202110411832.2A patent/CN113029815A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007442A (en) * | 2023-09-28 | 2023-11-07 | 广东新亚光电缆股份有限公司 | Protective sleeve flexibility degree detection system of insulating flat flexible cable |
| CN117007442B (en) * | 2023-09-28 | 2023-12-19 | 广东新亚光电缆股份有限公司 | Protective sleeve flexibility degree detection system of insulating flat flexible cable |
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