Variable-frequency cable drum

A tension controller body is arranged on one side of a winding wheel, an upper riding wheel and a lower riding wheel are symmetrically arranged on the upper portion and the lower portion in the tension controller body respectively, an upper limiting switch is arranged above the upper riding wheel, a lower limiting switch is arranged below the lower riding wheel, and a tension upper limit adjusting bolt is arranged on one side of the upper riding wheel. A tension lower limit adjusting bolt is arranged on one side of the lower supporting wheel, and under the cooperation of the upper supporting wheel, the lower supporting wheel, the upper limiting switch and the lower limiting switch, the tension can return to the original set range according to the tension situation occurring in the cable winding process of the winding wheel. The winding speed of the winding wheel during winding work of a cable is adjusted, and under the action of an upper adjusting bolt and a lower adjusting bolt, the upper limiting value rang