source:Industry News Popular:adapter release time:2021-05-06 10:50:21 Article author:sznbone
The mechanical performance test of the cable power cord produced by the power cord manufacturer mainly examines the tensile strength and elongation at break of the insulation and sheath plastic materials, including before and after aging, as well as the bending test, bending test, and bending test of the finished flexible cable. Load broken core test, insulated core tear test, static bending test, etc. Tensile strength before and after aging, and elongation at break before and after aging are the most important and basic indicators of cable insulation and sheath materials. It is required to be used as a material for cable insulation and sheath, and it must have sufficient tensile strength and not easy to pull. It must have a certain degree of flexibility. Aging refers to the ability of insulation and sheath materials to maintain their original performance under high temperature conditions. Aging should not seriously affect the tensile strength and elongation of the material. These will directly affect the material’s tensile strength and elongation. The service life of the cable, if the tensile strength and elongation at break are unqualified, the sheath or insulator will easily break during the construction and installation of the cable, or the sheath and insulation of the cable used in the light or heat environment will easily change It is brittle and fractured, causing the live conductor to be exposed, causing the risk of electric shock.
In addition, since the flexible cables produced by power cord manufacturers are not fixedly laid, they are repeatedly pulled and bent during use. Therefore, the standard for flexible cables additionally stipulates that dynamic bending tests, bending tests, and load broken cores should be added to the finished cables. Test, insulation core tear test, static bending test, etc., to ensure that this cable meets the requirements in actual use. For example, the dynamic torsion test mainly examines whether the twisted wires of the flexible conductor break and reduce the electrical transmission performance when the flexible cable is subjected to external mechanical tension and bending stress, or whether the insulation is pierced and the electrical performance of the insulation is reduced; Being under stress is a test method to determine whether the electrical insulation performance of the cable is affected by deformation or cracking.
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