Self-adjusting deviation rectifying and preventing device of belt conveyor, adjusting method and belt conveyor

The self-adjusting deviation rectifying and preventing device comprises a conveying belt, a bearing carrier roller and a carrier roller support, the top of the carrier roller support is connected with the bearing carrier roller, the conveying belt is arranged at the top of the bearing carrier roller, the self-adjusting deviation rectifying and preventing device further comprises idler wheels connected with the two sides of the bottom of the carrier roller support, and the idler wheels are connected with the two sides of the bottom of the carrier roller support. The carrier roller bracket moves on the roller to ensure that the center line of the carrier roller bracket is vertical to the theoretical center line of the conveyor; the return device is connected with the two sides of the idler wheel so that the carrier roller support can move on the idler wheel in a limited and stable mode. The pressing wheel is connected with the two ends of the top of the conveying belt, and the rotating direction of the pressing