Mainlv consists of rakers,lifting parks,pusher,control parks,frame,supporter and the like.Being open ,the scraper travels along the guidewav downward to the bottom,the opening sraper will be closed by the control parts to drddge up the refuse and sundries into scraper.then the lifting parts raise it to slndge-discharing point,finally unload the slades with the pusher.the scaper stops travel upward and opens again,Till now it has completed a circulation.

The movement procedure  above will be completed by PLC automatic control in the electric box on site .The grate will be ,at intervals,perfommed according to the settled time or the automatic control of pressure head between fore-and past-grate.