Cutter frequency conversion driving device for shield tunneling machine

The utility model relates to an accessory device for a shield tunneling machine, in particular to a cutterhead variable frequency driving device for the shield tunneling machine. In order to solve the problems that in the prior art, redundancy is poor, and large harmonic waves can be generated on a network test, the utility model provides a novel cutterhead frequency conversion driving device for a shield tunneling machine, which comprises a twelve-pulse dry-type rectifier transformer provided with two secondary sides, wherein one secondary side is connected with the input end of the first rectifier through the first circuit breaker, the other secondary side is connected with the input end of the second rectifier through the second circuit breaker, the first rectifier and the second rectifier are connected in parallel and then connected with the input ends of the six inverters, and the output ends of the six inverters are connected with the six cutterhead variable frequency motors respectively. And a connecti