Work 
 Drum grate discharge machine filter, also known as fine grid or spiral grill machine, is a set of fine grid decontamination machine, spiral elevator gate and gate slag slag screw press in one of the devices. Grill piece drum made by the gate-gate gap basket, the basket before the treated water flows from the grid, filtered through the grid, the flow of the pool exit gate surface residue trapped in the gate, when the water level difference inside and outside the gate reaches a certain value, installed in the center of the rotation axis rotary harrow teeth clean up, when the Qing residue gear set to rake the dirt picking the location of the vertex grid baskets (clock 12), began to unload slag (the gate can fall by gravity into the slag discharge gate slag trough); and later, turn 150, is the top of the slag gate basket board to adhere to the rake teeth teeth scraping on the automatic gate slag, slag discharge into the gate slot. Residue from the bottom of the gate to enhance screw conveyor, the upper section of press dewatering press after the Sinotrans, gate residue solid content of up to 35% -45% DS.