Ultrasonic bonding device for paper cup machine

The utility model discloses an ultrasonic bonding device for a paper cup machine, which comprises a workbench, an ultrasonic bonding device and a cup body forming mechanism, the ultrasonic bonding device comprises two support plates respectively positioned on two sides of the cup body forming mechanism, and a transverse plate positioned above the cup body forming mechanism is fixed on the two support plates. Two fixing plates are arranged on the transverse plate, a driving shaft is arranged between the two fixing plates, an eccentric wheel is arranged at the center of the driving shaft, a transmission wheel in transmission fit is arranged on the eccentric wheel, a connecting end is arranged at the bottom of the transmission wheel, a connecting block is hinged to the connecting end, and an upper mounting plate is mounted at the bottom of the connecting block; lifting guide rods penetrating to the position below the transverse plate are arranged at the four corners of the bottom of the upper mounting plate corr