Tail ash recovering device for bag-type dust remover

The invention discloses a tail ash recovering device for a bag-type dust remover. The problems that before transformation, as four start-type dischargers and air cannons are started at the same time, tail ash output amount is large, a motor is prone to blocking and burning, and clearing is difficult when the motor is blocked are solved. Gas with dust enters boxes from one to four through a dust-containing gas inlet, the dust adheres to a dust removal bag when passing through the dust removal bag and is continuously accumulated, the dust removal capacity of the dust removal bag is reduced continuously, then a relay acts to start a first air cannon and a third air cannon, strong gas flow impacts the dust removal bag, at the same time, a first planet discharger and a third planet discharger are started, and falling dust is pushed into an ash channel to be discharged gradually; when preset time of the time relay arrives, the relay acts again to start a second air cannon, a fourth air cannon, a second planet discharger and a fourth discharger, falling dust is pushed into the ash channel to be discharged gradually, and the ash discharging process is completed.