Downhole gangue discharging system and method

The invention discloses a downhole gangue discharging system and method. Raw coal is subjected to size grading by a screening device to enter into different conveying devices, then a dry sorting system for intelligent identification and sorting of minerals is performed by using rays, clean coal and gangue are identified according to the difference of the ray absorption amount of the clean coal andthe gangue, and a robot arm is used as an actuator. The downhole gangue discharging system and method can not only grade the raw coal in the downhole, but also perform intelligent and mechanical gangue discharging on coal gangue with different granular grades, change the current technical status of the downhole run-mine coal without processing and effectively reduce the ineffective transportationof the downhole gangue, and a distribution device can enable the raw coal to change from a single channel to multiple channels while ensuring uniform distribution of a single layer, the processing efficiency of an identificat