Large-span self-moving power transmission system for new energy engineering machinery

The invention discloses a large-span self-moving power transmission system for new energy engineering machinery. The system comprises a large-span track, a self-moving crown block and an engineering vehicle. The self-moving overhead travelling crane has the advantages that the self-moving overhead travelling crane is installed on the track, the sliding contact line is fixed to the track through the support, an external power source transmits direct current to the self-moving overhead travelling crane through the sliding contact line, the self-moving overhead travelling crane is connected with the constant-tension electric winding drum through the power cable, electric power is transmitted to a vehicle, the power transmission distance is guaranteed, and power supply of the vehicle is maintained; large-span power transmission is realized, and the application range of the vehicle is expanded; the self-moving crown block is provided with a power driving wheel, a guide wheel, a rail upper pressing wheel and a rail