The invention discloses a deepwater mining annular pipeline lifting and conveying device. A main supporting
pipe is integrally formed by fixing at least two segments of supporting pipes through connecting pieces. A
buoyancy air cabin with an electric
hydraulic pump station, a
buoyancy air cabin and a middle boost pump are arranged in the supporting pipes and an
electric power control cable is arranged in a cable groove in the outer sides of the supporting pipes. The upper end and the lower end of the main supporting
pipe are connected with a mining vessel lifting device and a traction steel
wire rope respectively. A lifting and conveying
pipe is an annular spiral pipeline which is fixed on the supporting pipes in a surrounding mode. The upper end and the lower end of the lifting and conveying pipe are connected with an ore sand output pump and a flexible conveying pipe respectively. The lifting and conveying pipe performs lifting and conveying in a spiral mode, the
gravitational effect due to mineral substance
free fall in the pipeline is avoided, and therefore the lifting and conveying distance is longer. Due to the fact that the electric
hydraulic pump station is arranged in the
buoyancy air cabin in the supporting pipes, the
underwater weight of the whole device is reduced, in addition, working power is provided for the middle boost pump and an all-direction
propeller, and the deepwater mining annular pipeline lifting and conveying device is
safer and more reliable in use. Deepwater is led in through the all-direction
propeller and a diversion hole to generate reacting force to prevent the supporting pipes from being twisted and deformed.