CN112683129A - Method for detecting minimum bending radius of cable - Google Patents

Abstract

The application provides a method for detecting the minimum bending radius of a cable, which comprises the following steps: sequentially winding a cable to be tested on a plurality of cylinders with the radius from large to small until the cable to be tested is broken to obtain a first radius, wherein the first radius is the radius of the cylinder corresponding to the broken cable to be tested; winding the cable to be tested on a cylinder with the radius of a second radius, wherein the second radius is the average value of the first radius and a third radius, and the third radius is the minimum radius of the cylinder, which is not crushed, of the cable to be tested after winding; under the condition that the cable to be tested is broken, the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius; and under the condition that the cable to be tested is not broken, repeating the step S102 until the cable to be tested is broken, wherein the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius. The method solves the problem that the minimum bending radius of the cable cannot be detected in the prior art.

Description

Method for detecting minimum bending radius of cable

Technical Field

The application relates to the technical field of minimum bending radius measurement, in particular to a method for detecting the minimum bending radius of a cable.

Background

The smooth aluminum jacketed cable has smaller outer diameter of the cable with the same conductor section compared with the corrugated aluminum structure due to the requirement of no embossing process, which means that the outer structure needs less raw materials for forming and has lower cost. The cable inevitably bends during transportation, laying and operation, which causes the aluminum sheath to be pressed inwards; meanwhile, along with the change of the external temperature and the change of the current-carrying capacity of the conductor, the phenomenon of expansion with heat and contraction with cold can occur inside the cable, so that a certain pressure exists between the aluminum sheath and the insulation. The cable with the smooth aluminum sheath structure is more prone to sheath breakage after being stressed, and the bending radius of the cable is a key parameter influencing the stress condition of the cable sheath. The minimum bend radius of a cable refers to the bend radius of the cable measured when the cable jacket is caused to break. However, at present, a method for testing the minimum bending radius of a cable with a straight aluminum sheath structure is lacked, so that cable and accessory manufacturers cannot clearly determine the manufacturing requirement of the minimum bending radius of the cable with the straight aluminum sheath structure, and cable application units cannot evaluate and accept the minimum bending radius of the cable with the straight aluminum sheath structure.

The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

The application mainly aims to provide a method for detecting the minimum bending radius of a cable, so as to solve the problem that the minimum bending radius of the cable cannot be detected in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a method for detecting a minimum bending radius of a cable, including: s101, sequentially winding a cable to be tested on a plurality of cylinders with the radius from large to small until the cable to be tested is broken to obtain a first radius, wherein the first radius is the radius of the cylinder corresponding to the broken cable to be tested; step S102, winding the cable to be tested on a cylinder with a radius of a second radius, wherein the second radius is an average value of the first radius and a third radius, and the third radius is the minimum radius of the cylinder, which is not broken after winding, of the cable to be tested; step S103, under the condition that the cable to be tested is broken, the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius; and S104, under the condition that the cable to be tested is not broken, repeating the step S102 until the cable to be tested is broken, wherein the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius.

Optionally, after step S103 or step S104, the method further includes: and determining whether the cable to be tested meets the 10D standard or not according to the minimum bending radius of the cable to be tested.

Optionally, a plurality of cable samples to be tested in the same batch are detected, so as to obtain the range of the minimum bending radius of the cables in the same batch.

Optionally, the multiple cylinders in step S101 are numbered according to the radius from large to small, and the radius difference between any two adjacent numbered cylinders is equal.

Optionally, the length of the cable to be tested is greater than or equal to a predetermined length.

Optionally, the cylinder is a disk in step S102.

In the method for detecting the minimum bending radius of the cable according to the present disclosure, first, a cable to be measured is sequentially wound around a plurality of cylinders having a radius from large to small until the cable to be measured is crushed to obtain a first radius, the first radius is a radius of the cylinder corresponding to the crushed cable to be measured, then, the cable to be measured is wound around a cylinder having a radius of a second radius, the second radius is an average value of the first radius and a third radius, the third radius is a minimum radius of the cylinder in which the cable to be measured is not crushed after winding, and finally, when the cable to be measured is crushed, the minimum bending radius of the cable to be measured is an average value of the first radius and the second radius, and when the cable to be measured is not crushed, step S102 is repeated, and until the cable to be tested is broken, the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius. According to the method, the minimum bending radius is reduced to be between the radii of two cylinders by sequentially winding the cylinders with the radii from large to small, the radius of the cylinder which enables the wound cable to be detected to be crushed for the second time is found by a median method, the minimum bending radius can be determined to be the average value of the radii of the cylinders corresponding to the two times of crushing, the detection process is simple to operate, and the problem that the minimum bending radius of the cable cannot be detected in the prior art is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

fig. 1 shows a flow chart of a method for detecting a minimum bend radius of a cable according to an embodiment of the present application.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.

As described in the background of the invention, the minimum bending radius of the cable cannot be detected in the prior art, and in order to solve the above problem, the present application proposes a method for detecting the minimum bending radius of the cable.

According to an embodiment of the present application, there is provided a method for detecting a minimum bending radius of a cable, as shown in fig. 1, the method including:

step S101, sequentially winding a cable to be tested on a plurality of cylinders with the radius from large to small until the cable to be tested is broken to obtain a first radius, wherein the first radius is the radius of the cylinder corresponding to the broken cable to be tested;

step S102, winding the cable to be tested on a cylinder with a radius of a second radius, wherein the second radius is an average value of the first radius and a third radius, and the third radius is the minimum radius of the cylinder, which is not crushed after winding, of the cable to be tested;

step S103, under the condition that the cable to be tested is broken, the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius;

and step S104, under the condition that the cable to be tested is not broken, repeating the step S102 until the cable to be tested is broken, wherein the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius.

In the method for detecting the minimum bending radius of the cable, firstly, a cable to be detected is sequentially wound on a plurality of cylinders with the radius from large to small until the cable to be detected is crushed to obtain a first radius, the first radius is the radius of the cylinder corresponding to the crushing of the cable to be detected, then, the cable to be detected is wound on the cylinder with the radius of a second radius, the second radius is the average value of the first radius and a third radius, the third radius is the minimum radius of the cylinder which is not crushed after the winding of the cable to be detected, finally, when the cable to be detected is crushed, the minimum bending radius of the cable to be detected is the average value of the first radius and the second radius, when the cable to be detected is not crushed, the step S102 is repeated until the cable to be detected is crushed, the minimum bending radius of the cable to be measured is an average value of the first radius and the second radius. According to the method, the minimum bending radius is reduced to be between the radii of two cylinders by sequentially winding the cylinders with the radii from large to small, the radius of the cylinder which enables the wound cable to be detected to be crushed for the second time is found by a median method, the minimum bending radius can be determined to be the average value of the radii of the cylinders corresponding to the two times of crushing, the detection process is simple to operate, and the problem that the minimum bending radius of the cable cannot be detected in the prior art is solved.

It should be noted that, in both cases where the cable to be measured is broken in step S103 and the cable to be measured is not broken in step S104, the minimum bending radius of the cable to be measured is an average value of the first radius and the second radius, but the second radii corresponding to the two cases are not the same, and since the third radius is the minimum radius of the cylinder in which the cable to be measured is not broken after being wound, the third radii are different in both cases, the third radius is the radius of the cylinder in step S101 in the former case, and the third radius is the radius of the cylinder in step S102 in the latter case, the second radii corresponding to the two cases are not the same, and therefore, the minimum bending radii corresponding to the two cases are not the same.

In an embodiment of the present application, after step S103 or step S104, the method further includes: and determining whether the cable to be tested meets the 10D standard or not according to the minimum bending radius of the cable to be tested. Specifically, if the minimum bending radius of the cable to be tested is greater than or equal to 10 times of the outer diameter of the cable to be tested, it can be determined that the cable to be tested conforms to the 10D standard, otherwise, the cable to be tested does not conform to the 10D standard.

In an embodiment of the application, a plurality of cable samples to be tested in the same batch are detected to obtain the range of the minimum bending radius of the cables in the same batch. Specifically, a plurality of cables in the same batch are selected as samples, and the minimum bending radii of the samples are respectively detected by adopting the method, so that the range of the minimum bending radii of the cables in the batch is determined according to the minimum bending radii of the samples, and the minimum bending radii of the cables in the batch are convenient for relevant personnel to refer.

In an embodiment of the present application, the multiple cylinders in step S101 are numbered according to their radii from large to small, and the radius differences between any two adjacent numbered cylinders are equal. Specifically, the plurality of cylinders in step S101 are numbered according to the radius from large to small, and the radius of the cylinder corresponding to the number is recorded, so that the radius of the cylinder is conveniently queried according to the number of the cylinder, the radius differences of any two adjacent cylinders with numbers are equal, that is, the cylinders are equal-radius gradient cylinders,

in an embodiment of the present application, the length of the cable to be tested is greater than or equal to a predetermined length. Specifically, the skilled person can select a suitable predetermined length according to the actual situation to ensure that the cable to be tested can be broken twice at different positions.

In an embodiment of the present application, the cylinder in step S102 is a circular disk. Specifically, the cylinder of step S101 can be customized by cable parameters to can recycle and detect cables of uniform specification, the cylinder is generally difficult to recycle in step S102, and needs to be temporarily manufactured, and the manufacturing cost and the manufacturing time can be reduced by using a disc which is simple to manufacture, so that the detection efficiency is improved.

In order to make the technical solutions of the present application more intuitively known to those skilled in the art, the following description is provided by specific examples.

Example 1

Selecting a cable with the outer diameter of 50mm as a sample, and detecting by adopting the method for detecting the minimum bending radius of the cable, wherein the sheath is damaged when the cable is wound on a disc with the radius of 510mm, the sheath is not damaged when the cable is wound on a disc with the radius of 530mm, the disc with the radius of 520mm is taken, the cable is wound on the disc, and the minimum bending radius of the cable is 515mm when the cable sheath is damaged.

Example 2

Another cable with the outer diameter of 50mm in the same batch is selected as a sample to be detected by adopting the method for detecting the minimum bending radius of the cable, the sheath is damaged when the cable is wound on a disc with the radius of 540mm, the sheath is not damaged when the cable is wound on a disc with the radius of 560mm, the disc with the radius of 550mm is taken, the cable is wound on the disc, the cable sheath is not damaged, the disc with the radius of 545mm is taken, the cable is wound on the disc, and the cable sheath is damaged, so that the minimum bending radius of the cable is 542.5 mm.

Example 3

Selecting another cable with the outer diameter of 50mm in the same batch as a sample, and adopting the detection method for detecting the minimum bending radius of the cable, wherein the sheath is damaged when the cable is wound on a disc with the radius of 620mm, the sheath is not damaged when the cable is wound on a disc with the radius of 640mm, the disc with the radius of 630mm is taken, the cable is wound on the disc, the cable sheath is not damaged, the disc with the radius of 625mm is taken, the cable is wound on the disc, the cable sheath is not damaged, the disc with the radius of 622mm is taken, the cable is wound on the disc, and the cable sheath is damaged, so that the minimum bending radius of the cable is 621 mm.

From the test results of examples 1 to 3, the minimum bending radius of the cable batch is 515mm to 621mm, which meets the 10D standard.

From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

the method for detecting the minimum bending radius of the cable includes the steps of firstly, winding a cable to be detected on a plurality of cylinders with the radius from large to small in sequence until the cable to be detected is broken to obtain a first radius, wherein the first radius is the radius of the cylinder corresponding to the broken cable to be detected, then, winding the cable to be detected on the cylinder with the radius of a second radius, wherein the second radius is the average value of the first radius and a third radius, the third radius is the minimum radius of the cylinder which is not broken after the cable to be detected is wound, finally, when the cable to be detected is broken, the minimum bending radius of the cable to be detected is the average value of the first radius and the second radius, and when the cable to be detected is not broken, repeating step S102 until the cable to be detected is broken, the minimum bending radius of the cable to be measured is an average value of the first radius and the second radius. According to the method, the minimum bending radius is reduced to be between the radii of two cylinders by sequentially winding the cylinders with the radii from large to small, the radius of the cylinder which enables the wound cable to be detected to be crushed for the second time is found by a median method, the minimum bending radius can be determined to be the average value of the radii of the cylinders corresponding to the two times of crushing, the detection process is simple to operate, and the problem that the minimum bending radius of the cable cannot be detected in the prior art is solved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. A method for detecting the minimum bending radius of a cable is characterized by comprising the following steps:

s101, sequentially winding a cable to be tested on a plurality of cylinders with the radius from large to small until the cable to be tested is broken to obtain a first radius, wherein the first radius is the radius of the cylinder corresponding to the broken cable to be tested;

step S102, winding the cable to be tested on a cylinder with a radius of a second radius, wherein the second radius is an average value of the first radius and a third radius, and the third radius is the minimum radius of the cylinder, which is not broken after winding, of the cable to be tested;

step S103, under the condition that the cable to be tested is broken, the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius;

and S104, under the condition that the cable to be tested is not broken, repeating the step S102 until the cable to be tested is broken, wherein the minimum bending radius of the cable to be tested is the average value of the first radius and the second radius.

2. The method of claim 1, wherein after step S103 or step S104, the method further comprises:

and determining whether the cable to be tested meets the 10D standard or not according to the minimum bending radius of the cable to be tested.

3. The method of claim 1, wherein the testing of multiple cable samples to be tested in the same batch results in a range of minimum bend radii for cables in the same batch.

4. The method of claim 1, wherein the plurality of cylinders in step S101 are numbered with radii from large to small, and the radius difference between any two adjacent numbered cylinders is equal.

5. The method of claim 1, wherein the length of the cable under test is greater than or equal to a predetermined length.

6. The method of claim 1, wherein the cylinder is a disk in step S102.

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