Belt conveyor system for rectangular shield tunneling machine and application and method for belt conveyor system for rectangular shield tunneling machine

The invention discloses a belt conveyor system for a rectangular shield tunneling machine. The belt conveyor system for the rectangular shield tunneling machine comprises a first-stage belt conveyor, a second-stage belt conveyor, a lifting mechanism and an axial movement mechanism. The first-stage belt conveyor is fixedly arranged in a shell of the rectangular shield tunneling machine and located below a central cross beam. The second-stage belt conveyor comprises a second-stage belt conveyor front section and a second-stage belt conveyor rear section which are connected through a hinge piece. The lifting mechanism is connected with the second-stage belt conveyor front section and drags the front end of the second-stage belt conveyor front section to ascend or descend. The axial movement mechanism is arranged on the second-stage belt conveyor, so that the second-stage belt conveyor moves in or away from the shield tunneling direction in a rectangular tunnel in the axis direction of the tunnel. After the belt