A rigid-flexible coupling mechanism for fibre bundle tension control, comprising a front guide roller, a back guide roller, and a tension regulating roller provided between the front guide roller and the back guide roller, wherein the tension regulating roller is mounted on an up-and-down movable bracket on a swing frame, swinging of the swing frame and sliding of the tension regulating roller are controlled by a servo motor and an electric actuator in a dual drive mode, wherein an end of a main body of the electric actuator is connected to the servo motor, and a rod of the electric actuator is connected to one side of the bracket by a rotating shaft;
- wherein two sliding rails are mounted on both sides of the swing frame to be connected with the bracket through a sliding connection, and the tension regulating roller is mounted on the bracket, facilitating up-and-down sliding of the tension regulating roller;
- a spring substrate is mounted on the swing frame below the tension regulating roller, and the spring substrate is connected to the tension regulating roller through springs to provide a cushioning effect on an up-and-down movement of the tension regulating roller;
- wherein a fast response to tension regulation or arbitrary trajectory adjustment of the tension regulating roller is facilitated by choosing either a four-rod fixed length mechanism or a five-rod variable length mechanism based on different working conditions;
- wherein when a tension control range is small and the fast response to the tension regulation is required, the four-rod fixed length mechanism is used for tension control;
- and when the tension increases, an output shaft of the servo motor rotates clockwise to drive the electric actuator to rotate clockwise around a motor axis of the servo motor, and an angle of the rod of the electric actuator changes to drive the swing frame to rotate clockwise around a spindle meanwhile, the bracket drives the tension regulating roller to move downwards, such that distances between the tension regulating roller and the front guide roller and between the tension regulating roller and the back guide roller are reduced to achieve tension reduction;
- conversely, when the tension decreases during a transmission process of the fibre bundle, the servo motor reverses to drive the swing frame to rotate counterclockwise, the tension regulating roller moves upwards, and the distances between the tension regulating roller and the front guide roller and between the tension regulating roller and the back guide roller are increased to increase the tension of the fibre bundle;
- wherein when the tension control range is large and a change in a position of the tension regulating roller is required to be along any trajectory, the five-rod variable length mechanism is used for the tension control;
- when the tension increases, the output shaft of the servo motor rotates clockwise to drive the electric actuator to rotate clockwise around the motor axis, and the electric actuator drives the rod thereof to contract, and the angle and a length of the rod change to drive the swing frame to rotate counterclockwise around the spindle meanwhile, the bracket drives the tension regulating roller to move downwards, such that the distances between the tension regulating roller and the front guide roller and between the tension regulating roller and the back guide roller are reduced to achieve tension reduction;
- conversely, when the tension decreases during the transmission process of the fibre bundle, the servo motor reverses and the rod is extended to drive the swing frame to rotate clockwise, the tension regulating roller moves upwards, and the distances between the tension regulating roller and the front guide roller and between the tension regulating roller and the back guide roller are increased to increase the tension of the fibre bundle.