Coaxial spiral conveying device

The invention discloses a coaxial spiral conveying device. A conveyor I and a conveyor II are coaxially arranged in a shell, and a spiral blade of the conveyor I is arranged in a hollow shaft of the conveyor II; a spiral blade of the conveyor II is fixedly mounted on the outer circumference of the hollow shaft; the cross section of the shell is U-shaped, one end of the shell is sequentially provided with an inlet I allowing a drilling centrifugal machine to discharge drilling cuttings and an inlet II allowing a drilling vibrating screen to discharge drilling cuttings; a partition plate is fixedly mounted in the shell to axially separate the inlet I from the inlet II; the lower part of the other end of the shell is provided with a discharging opening II allowing the drilling vibrating screen to discharge the drilling cuttings; the end, away from the inlet I allowing the drilling centrifugal machine to discharge the drilling cuttings, of the hollow shaft is provided with a drilling cutting discharging opening I