Variable-speed straight feeding mechanism

The utility model belongs to the technical field of material conveying equipment, and particularly relates to a variable-speed straight feeding mechanism. The variable-speed straight feed mechanism comprises a base, a driving assembly and a speed change mechanism, the driving assembly comprises a motor and a driving shaft, the motor is installed on the base, and the driving shaft is in transmission connection with an output shaft of the motor; the speed change mechanism comprises a support, a cam and a crank, the cam is fixedly connected to the driving shaft, the support is installed on the base, the crank is rotationally connected to the support, one end of the crank is rotationally connected with a roller, the roller abuts against the cam, and the other end of the crank is provided with a connecting rod. The motor drives the driving shaft to rotate, the idler wheel abuts against the cam, the idler wheel rolls along the circumferential side of the cam, the cam has different diameters, the idler wheel has dif