Wire Flexibility Testing Device and Testing Method

Abstract

The present invention provides a wire flexibility testing device and a testing method. The wire flexibility testing component includes a guide wheel mounting plate and n sliding guide wheels, where n is greater than or equal to 4; the n sliding guide wheels are mounted on the guide wheel mounting holes of the guide wheel mounting plate, and the guide wheel mounting holes adopt a non-limiting adjustable design for adjusting the distance between the sliding guide wheels; the n sliding guide wheels include two end sliding guide wheels and multiple intermediate sliding guide wheels. The two end sliding guide wheels are respectively located at both ends of the guide wheel mounting plate, the multiple intermediate sliding guide wheels are located between the two end sliding guide wheels, and their centers are on the same straight line. The two end sliding guide wheels are respectively located on both sides of the straight line and are at the same distance from the straight line. In the direction perpendicular to the straight line, the distance between the central axes of any two adjacent sliding guide wheels is the same. This device can test the flexibility of wires.

Description

Technical Field

[0001] The present invention relates to the technical field of wire harness wiring, and particularly to a wire flexibility test component, a test device and a test method. Background Art

[0002] With the improvement of wire harness processing and wire harness wiring requirements, wire harness companies have put forward higher requirements for the flexibility of wires. However, in the prior art, the softness and hardness of wires can only be identified by human senses, or for wires with a larger cross-section, the bending radius of the wire can be used for rough identification. It is very difficult to accurately test the flexibility of wires. The disadvantage is that there are sensory deviations among different people, which has a greater impact on the design of wires, the selection of materials, the design of processing technology, etc. If the flexibility is blindly pursued in material selection or process design, it is very likely to affect other properties of the wire, such as the abrasion resistance of the insulation, the mechanical properties of the insulation, the high-temperature pressure properties, etc. Therefore, it has a certain impact on the wiring process.

[0003] Therefore, there is an urgent need for a device that can test the flexibility of wires to quantify the flexibility requirements of wires. Summary of the Invention

[0004] The present invention provides a wire flexibility test component, a test device and a test method to solve the defects existing in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions.

[0006] The present invention provides a wire flexibility test component, including: a guide wheel mounting plate and n sliding guide wheels, where n is greater than or equal to 4;

[0007] The n sliding guide wheels are mounted on the guide wheel mounting holes of the guide wheel mounting plate. The guide wheel mounting holes are designed with non-limiting adjustability to adjust the distance between the sliding guide wheels;

[0008] The n sliding guide wheels include two end sliding guide wheels and multiple intermediate sliding guide wheels. The two end sliding guide wheels are respectively located at both ends of the guide wheel mounting plate. The multiple intermediate sliding guide wheels are located between the two end sliding guide wheels and their centers are on the same straight line. The two end sliding guide wheels are respectively located on both sides of the straight line and the distances from the straight line are the same. In the direction perpendicular to the straight line, the distance between the central axes of any two adjacent sliding guide wheels is the same.

[0009] Preferably, the guide wheel mounting holes are long holes, and the guide wheel mounting holes are provided with limit members.

[0010] Preferably, the sliding guide pulley includes: a guide pulley, a bearing, and a central shaft. The sliding guide pulley is fixed to the guide pulley mounting plate through the central shaft. A wire groove is provided on the guide pulley for winding the wire to be tested. The length of the guide pulley mounting plate is 300 mm to 400 mm, and the thickness of the guide pulley mounting plate is not less than 5.0 mm.

[0011] Preferably, the diameter φ of the guide pulley is 29 ± 0.5 mm, the width of the guide pulley is 10 ± 0.5 mm, the arc radius R of the wire groove is 9 mm, and the applicable diameter range of the test wire is 1.0 mm to 4.5 mm.

[0012] Preferably, the diameter φ of the guide pulley is 35 ± 0.5 mm, the width of the guide pulley is 12 ± 0.5 mm, the arc radius R of the wire groove is 8 mm, and the applicable diameter range of the test wire is 4.6 mm to 6.0 mm.

[0013] Preferably, in the direction perpendicular to the straight line, the distance between the central axes of any two adjacent sliding guide pulleys is 42 ± 1 mm.

[0014] Preferably, in the direction perpendicular to the straight line, the distance between the central axes of any two adjacent sliding guide pulleys is 55 ± 1 mm.

[0015] Preferably, the distance between the center of each sliding guide pulley of the two end sliding guide pulleys and the straight line is 18 ± 0.5 mm.

[0016] Another aspect of the present invention provides a wire flexibility testing device applying the above-mentioned testing component, further including: a tensile testing machine and weights;

[0017] The tensile testing machine is connected to the wire to be tested through a fixture for measuring the tensile force applied to the wire to be tested;

[0018] The testing component is fixed within a certain range of the tensile testing machine for winding the wire to be tested around the testing component in a wavy shape, so that the tensile testing machine tests the tensile force value applied to the wire in a bent state;

[0019] The weights are used to be tied to the wire to be tested so that the wire to be tested passes through the testing component.

[0020] The present invention also provides a testing method for wire flexibility testing applying the above-mentioned testing device, including the following steps:

[0021] A Keep the testing environment at 23 ± 1 °C and place the wire to be tested in the above-mentioned testing environment for at least 2 hours;

[0022] Fasten one end of the wire to be tested to the fixture of the tensile testing machine, then wind it around each sliding guide wheel of the test component in a wavy shape, apply a force of F2 to the other end of the wire to be tested with weights, set the tensile testing machine to pull the wire to be tested through the test component at a speed of 50 mm / min, and pull the wire to be tested for about 125 mm to obtain the tensile force value F1;

[0023] Replace the wire to be tested with a soft cotton thread or aramid roving with a diameter of 1.5 - 2.5 mm, and use the same method as in step B to measure the tensile force value F3, which is the resistance value of the device;

[0024] D Quantify the flexibility of the wire to be tested according to the following formula (1):

[0025] F = F1 - F2 - F3 (1)

[0026] As can be seen from the technical solutions provided by the wire flexibility testing device of the present invention above, the beneficial effects of the present invention are as follows:

[0027] Through the position design of the sliding guide wheels of the test component of the present invention, the tensile force value of the wire to be tested passing through the guide wheels in a bent state can be measured, then subtract the weight of the load weights, and then subtract the guide wheel resistance value. The obtained value is used as the wire flexibility test value to quantify the flexibility of the wire to be tested;

[0028] Through specific parameter settings of the components of the present invention, the flexibility of stranded soft conductor wires with diameters of 1.0 mm - 4.5 mm and 4.6 mm - 6.0 mm can be tested respectively, so as to quantitatively require the soft and hard values of the wires according to product uses, product performances, etc.;

[0029] By adopting a non-limiting adjustable design for the guide wheel mounting holes on the guide wheel mounting plate of the present invention, the test indexes of the test wire can be adjusted by changing the position of the sliding guide wheels, making one plate serve multiple purposes and saving costs economically;

[0030] The test component of the present invention is an independent component and can be used in cooperation with a tensile testing machine. During testing, the test component can be installed on the tensile testing machine, which is simple to operate, and the test component is convenient to store and has a low cost.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description, which will become apparent from the following description or be understood through the practice of the present invention. Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 Schematic structural diagram of the wire flexibility test device for Embodiment 1;

[0034] Figure 2 Schematic structural diagram of the test component 2 according to an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the position of the sliding guide wheel on the guide wheel mounting plate according to an embodiment of the present invention;

[0036] Figure 4 Schematic front view of the structure of the sliding guide wheel according to an embodiment of the present invention;

[0037] Figure 5 Schematic side view of the structure of the sliding guide wheel according to an embodiment of the present invention;

[0038] Figure 6 Schematic structural diagram of the wire flexibility test device for Embodiment 2;

[0039] Figure 7 Schematic diagram of the position of the sliding guide wheel on the guide wheel mounting plate according to another embodiment of the present invention;

[0040] Figure 8 Schematic side view of the structure of the sliding guide wheel according to another embodiment of the present invention;

[0041] Figure 9 Schematic structural diagram of the guide wheel mounting plate.

[0042] Explanation of reference numerals:

[0043] 1 Fixture 2 Test component 3 Weight 4 Wire to be tested 5 Horizontal tensile testing machine 6 Vertical tensile testing machine 7 Intermediate sliding guide wheel 8 End sliding guide wheel 9 End sliding guide wheel 10 Guide wheel mounting plate 11 Guide wheel mounting hole 12 Reserved mounting hole 13 Guide wheel 14 Bearing 15 Central axis 16 Straight line Detailed implementation manners

[0044] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0045] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the", and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention means the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The phrase "and / or" used herein includes any and all combinations of any one of the associated listed items.

[0046] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art and will not be interpreted with an idealized or overly formal meaning unless defined as such here.

[0047] For the convenience of understanding the embodiments of the present invention, the following will further explain and illustrate with several specific embodiments in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention. Embodiment 1

[0048] Figure 1 It is a schematic structural diagram of the wire flexibility test device for this Embodiment 1. Referring to Figure 1 , the device includes: a horizontal tensile testing machine 5, a test component 2, and weights 3.

[0049] The horizontal tensile testing machine 5 is connected to the wire 4 to be tested through a fixture 1 and is used to measure the tensile force that enables the wire 4 to be tested to pass through the test component 2.

[0050] The test component 2 is fixed within a certain range of the horizontal tensile testing machine 5. Schematically, in this embodiment, the test component 2 and the fixture position of the horizontal tensile testing machine are on the same horizontal line, so that the pulling direction of the wire is on the same horizontal line as the fixture direction of the tensile testing machine. Six sliding guide wheels are arranged on the test component 2 in a staggered manner, for winding the wire under test 4 around the test component 2 in a wavy shape, so that the horizontal tensile testing machine 5 can test the tensile force value applied to the wire under test 4 in a bent state;

[0051] The weight 3 is used to be tied to the wire under test 4 to enable the wire under test 4 to pass through the test component 2.

[0052] Figure 2 It is a schematic structural diagram of the test component 2, Figure 3 It is a schematic diagram of the position of the sliding guide wheel on the guide wheel mounting plate. Refer to Figure 2 and Figure 3 , the test component 2 includes a guide wheel mounting plate 10 and six sliding guide wheels (7, 8, 9); the six sliding guide wheels include two end sliding guide wheels (8 and 9) and four intermediate sliding guide wheels (7). The sliding guide wheels (7, 8, 9) are mounted on the guide wheel mounting plate 10. Among them, the two end sliding guide wheels (8 and 9) are respectively located at both ends of the guide wheel mounting plate, and the centers of the four intermediate sliding guide wheels 7 are on the same straight line (such as the straight line 16 shown in Figure 3 ). The two end sliding guide wheels are respectively on both sides of the straight line 16 and are at the same distance from the straight line 16. In the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is the same.

[0053] Figure 4 It is a schematic front view of the structure of the sliding guide wheel, Figure 5 It is a schematic side view of the structure of the sliding guide wheel. Refer to Figure 4 and Figure 5 , the sliding guide wheel includes: a guide wheel 13, a bearing 14 and a central shaft 15. The sliding guide wheel is fixed to the guide wheel mounting plate 10 through the central shaft 15, and a wire groove is provided on the guide wheel 13 for winding the wire under test 4.

[0054] In this embodiment, referring to Figure 5 , the diameter φ of the guide wheel can be 29 ± 0.5 mm, the width of the guide wheel is 10 ± 0.5 mm, the arc radius R of the wire groove is 9 mm, and the applicable diameter range for testing the wire under test 4 is 1.0 mm to 4.5 mm. The distance between the center of each end sliding guide wheel and the straight line 16 is 18 ± 0.5 mm (refer to Figure 3 ), and in the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is 42 ± 1 mm (refer to Figure 3 ).

[0055] Or, referring to Figure 8, the diameter φ of the guide wheel can be 35 ± 0.5 mm, the width of the guide wheel is 12 ± 0.5 mm, the arc radius R of the wire groove is 8 mm, and the applicable diameter range of the test wire 4 to be measured is 4.6 mm to 6.0 mm. The distance between the center of each end sliding guide wheel and the straight line 16 is 18 ± 0.5 mm (reference Figure 7 ), in the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is 55 ± 1 mm (reference Figure 7 ).

[0056] The guide wheel mounting plate is made of stainless steel plate with a thickness of not less than 5.0 mm, and the length of the guide wheel mounting plate is 300 mm to 400 mm.

[0057] The guide wheel mounting plate is provided with guide wheel mounting holes, and the sliding guide wheels are mounted in the guide wheel mounting holes. The guide wheel mounting holes adopt a non-limiting adjustable design for adjusting the distance between the sliding guide wheels. The guide wheel mounting holes are long holes, and there are limit parts in the guide wheel mounting holes for restricting the position of the sliding guide wheels in the guide wheel mounting holes, so as to adjust the distance between the sliding guide wheels. The guide wheel mounting holes adopt a non-limiting adjustable design. For different models of sliding guide wheels, the guide wheel mounting plate does not need to be replaced, making one plate serve multiple purposes and saving costs. Embodiment 2

[0058] Figure 6 is a schematic structural diagram of the wire flexibility test device of this Embodiment 2. Refer to Figure 6 , this device includes a vertical tensile machine 6, a test component 2 and a weight 3.

[0059] The vertical tensile machine 6 is connected to the wire 4 to be measured through a fixture 1 for measuring the tensile force that enables the wire 4 to be measured to pass through the test component 2.

[0060] The test component 2 is fixed at a predetermined position of the vertical tensile machine 6. In this embodiment, the test component 2 is fixed on the support rod of the vertical tensile machine 6 so that the tensile force direction of the wire is on the same straight line as the fixture direction of the tensile machine. There are 6 sliding guide wheels arranged in a staggered manner on the test component 2 for winding the wire 4 to be measured around the test component 2 in a wave shape, so that the vertical tensile machine 6 can test the tensile force value applied to the wire 4 to be measured in a bent state.

[0061] The weight 3 is used to be tied to the wire 4 to be measured so that the wire 4 to be measured can pass through the test component 2.

[0062] The test component 2 includes a guide wheel mounting plate and six sliding guide wheels; the sliding guide wheels are mounted on the guide wheel mounting holes of the guide wheel mounting plate. The sliding guide wheels include two end sliding guide wheels and four intermediate sliding guide wheels. The two end sliding guide wheels (8 and 9) are respectively located at both ends of the guide wheel mounting plate, and the four intermediate sliding guide wheels are respectively located between the two end sliding guide wheels and their centers are on the same straight line 16 (refer to Figure 3 ). The two end sliding guide wheels are respectively located on both sides of the straight line 16 and are at the same distance from the straight line 16. In the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is the same.

[0063] In this embodiment, refer to Figure 5 , the diameter φ of the guide wheel can be 29 ± 0.5 mm, the width of the guide wheel is 10 ± 0.5 mm, the arc radius R of the wire groove is 9 mm, and the applicable diameter range of the test wire 4 to be measured is 1.0 mm to 4.5 mm. The distance between the center of each end sliding guide wheel and the straight line 16 is 18 ± 0.5 mm (refer to Figure 3 ). In the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is 42 ± 1 mm (refer to Figure 3 ).

[0064] Or, refer to Figure 8 , the diameter φ of the guide wheel can be 35 ± 0.5 mm, the width of the guide wheel is 12 ± 0.5 mm, the arc radius R of the wire groove is 8 mm, and the applicable diameter range of the test wire 4 to be measured is 4.6 mm to 6.0 mm. The distance between the center of each end sliding guide wheel and the straight line 16 is 18 ± 0.5 mm (refer to Figure 7 ). In the direction perpendicular to the straight line 16, the distance between the central axes of any two adjacent sliding guide wheels is 55 ± 1 mm (refer to Figure 7 ).

[0065] The thickness of the guide wheel mounting plate is a stainless steel plate not less than 5.0 mm, and the length of the guide wheel mounting plate is 300 mm to 400 mm.

[0066] Figure 9 For the structural schematic diagram of the guide wheel mounting plate, refer to Figure 9 , the guide wheel mounting plate 10 is provided with guide wheel mounting holes 11 and reserved mounting holes 12. The guide wheel mounting holes 11 are used for mounting the sliding guide wheels, and the reserved mounting holes 12 are used for fixing the test component 2 to the tensile machine. The guide wheel mounting holes adopt a non-limiting adjustable design, and the mounting spacing of the sliding guide wheels can be adjusted. Schematically, the guide wheel mounting holes can be in the shape of long slots, and limiters are provided in the guide wheel mounting holes to adjust the position of the sliding guide wheels. Embodiment 3

[0067] This embodiment provides a test method for testing the flexibility of wires using an application test device. The specific steps are as follows:

[0068] The specific test steps are as follows:

[0069] A. Keep the test environment at 23 ± 1°C, and place the test sample in the above test environment for at least 2 hours;

[0070] B. Tie one end of the wire to be tested to the fixture of the tensile testing machine, then wind it around each sliding guide wheel of the test component in a wavy shape, apply a force F2 to the other end of the wire to be tested through weights, set the tensile testing machine to pull the wire to be tested through the test component at a speed of 50 mm / min, pull the wire to be tested for about 125 mm, and obtain the tensile force value F1;

[0071] C. Replace the wire to be tested with a soft cotton thread or aramid roving with a diameter of 1.5 - 2.5 mm, and use the same method as in step B to measure the tensile force value F3, which is the resistance value of the device;

[0072] D. Quantify the flexibility of the wire to be tested according to the following formula (1):

[0073] F = F1 - F2 - F3 (1)

[0074] The softer the wire, the smaller the tensile force value F; the harder the wire, the larger the tensile force value F. Thus, the flexibility of the wire to be tested can be quantified by the tensile force value F.

[0075] Those skilled in the art should understand that Figure 1 The number of each component shown only for the sake of simplicity may be less than that in an actual device, but this omission undoubtedly does not affect the clear and sufficient disclosure of the inventive embodiments.

[0076] Each embodiment in this specification is described in a progressive manner. For the same or similar parts between each embodiment, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments. The device and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0077] As described above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A wire flexibility testing device, characterized in that, It has a wire flexibility test component, which includes: a guide wheel mounting plate and n sliding guide wheels, where n is greater than or equal to 4; The n sliding guide wheels are mounted on the guide wheel mounting holes of the guide wheel mounting plate, and the guide wheel mounting holes adopt a non-limiting adjustable design for adjusting the distance between the sliding guide wheels; The n sliding guide wheels include two end sliding guide wheels and multiple intermediate sliding guide wheels. The two end sliding guide wheels are respectively located at both ends of the guide wheel mounting plate. The multiple intermediate sliding guide wheels are located between the two end sliding guide wheels and their centers are on the same horizontal line. The two end sliding guide wheels are respectively located on both sides of the line and the distances from the line are the same. In the direction perpendicular to the line, the distances between the central axes of any two adjacent sliding guide wheels are the same; The sliding guide wheel includes: a guide wheel, a bearing and a central shaft. The sliding guide wheel is fixed to the guide wheel mounting plate through the central shaft. A wire groove is provided on the guide wheel for winding the wire to be tested. The length of the guide wheel mounting plate is 300 mm to 400 mm, and the thickness of the guide wheel mounting plate is not less than 5.0 mm; The distance between the center of each of the two end sliding guide wheels and the line is 18 ± 0.5 mm; The wire flexibility test component further includes any one of the following features: The diameter φ of the guide wheel is 29 ± 0.5 mm, the width of the guide wheel is 10 ± 0.5 mm, the arc radius R of the wire groove is 9 mm, the applicable diameter range of the wire to be tested is 1.0 mm to 4.5 mm, and in the direction perpendicular to the line, the distance between the central axes of any two adjacent sliding guide wheels is 42 ± 1 mm; The diameter φ of the guide wheel is 35 ± 0.5 mm, the width of the guide wheel is 12 ± 0.5 mm, the arc radius R of the wire groove is 8 mm, the applicable diameter range of the wire to be tested is 4.6 mm to 6.0 mm, and in the direction perpendicular to the line, the distance between the central axes of any two adjacent sliding guide wheels is 55 ± 1 mm; The wire flexibility test device further includes: a tensile testing machine and weights; The tensile testing machine is connected to the wire to be tested through a fixture for measuring the tensile force applied to the wire to be tested; The test component is fixed within a certain range of the tensile testing machine for making the wire to be tested wound around the test component in a wavy shape, so that the tensile testing machine tests the tensile force value applied to the wire in a bent state; The weights are used to be tied to the wire to be tested so that the wire to be tested passes through the test component.

2. The wire flexibility testing device according to claim 1, characterized in that, The guide wheel mounting holes are long holes and there are limit pieces in the guide wheel mounting holes.

3. A test method for testing the flexibility of an electric wire by using the electric wire flexibility test device according to claim 1 or 2, characterized in that It includes the following steps: A Keep the test environment at 23 ± 1 °C and place the wire to be tested in the above test environment for at least 2 hours; Fasten one end of the wire to be tested to the fixture of the tensile testing machine, then wind it around each sliding guide wheel of the test component in a wavy shape, apply a force F2 to the other end of the wire to be tested through weights, set the tensile testing machine to pull the wire to be tested through the test component at a speed of 50 mm / min, pull the wire to be tested for about 125 mm, and obtain the tensile force value F1; Replace the wire to be tested with a soft cotton thread or aramid roving with a diameter of 1.5 - 2.5 mm, and use the same method as in step B to measure the tensile force value F3, which is the resistance value of the device; D Quantify the flexibility of the wire to be tested according to the following formula (1): F = F1 - F2 - F3 (1).

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