Rubber V belt cotton rope constant tension controller

The utility model relates to a constant-tension control device for a rubber V belt cotton rope, which relates to a tension control device and provides a simple reliable constant-tension control device for a rubber V belt cotton rope. A rotary encoder is connected with a cotton wheel device, the output terminal of the rotary encoder is connected with a programmable controller; one end of a resistor rule is connected with the cotton wheel device, and the voltage switching signal output terminal of the cotton rope winding speed fluctuation amount of the resistor rule is connected to the programmable controller; the input terminal of a frequency transformer is connected to the programmable controller, and the output terminal of the frequency transformer is connected to a three-phase asynchronous motor; an output shaft of the three-phase asynchronous motor is provided with a synchronous pulley provided with the cotton wheel device, and the input terminal is connected to the frequency converter; a tension measuring and displaying device is arranged between two rolling wheels of the cotton wheel device. The utility model overcomes the disadvantages that when the tension of the cotton rope is constant, the winding diameter of the cotton rope changes, the torque of a winding drum of the cotton rope correspondingly changes, and negative influence is brought for a control system, has the characteristics of simple and reliable control system, small cotton rope tension variation range, convenient use and repair, etc.; the product quality of a rubber V belt can be improved.