Driving device of pull-down type punching machine

The drive device of the pull-down type punching machine comprises a crankshaft installed on a machine body of the punching machine, a first drive piece driving the crankshaft to rotate, at least one set of pull rod assembly and an adjustable crank connecting rod assembly, an eccentric part is arranged on the crankshaft, and the pull rod assembly is connected with the eccentric part of the crankshaft through the adjustable crank connecting rod assembly. According to the driving device of the pull-down type punching machine, the adjustable crank connecting rod assembly is arranged on the pull rod assembly to adjust the distance between the pull rod assembly and the crankshaft, so that the die height on the punching machine is adjusted so as to facilitate installation of dies with different heights, automatic die adjustment is achieved in cooperation with transmission of a gear motor and a chain, and production efficiency is improved. The pull rod and the spring are used for reducing the power of the motor and m