污水处理一个重要步骤是通过机械处理，如格栅、沉淀或气浮，去除污水中所含的石块、砂石和脂肪、油脂等。这样才能进行后续处理工作。
嘉禾县、临武县、汝城县格栅除污机的工作原理是由一种独特的耙齿厂装配成一组回转格栅链。在电机减速器的驱动下，耙齿链进行逆水流方向回转运动。
耙齿链运转到设备的上部时，由于槽轮和弯轨的导向，使每组耙齿之间产生相对自清运动，绝大部分固体物质靠重力落下。另一部分则依靠清扫器的反向运动把粘在耙齿上的杂物清扫干净。
按水流方向耙齿链类同于格栅，在耙齿链轴上装配的耙齿间隙可以根据使用条件进行选择。当耙齿把流体中的固态悬浮物分离后可以保证水流畅通流过。An important step in sewage treatment is the removal of stones, sand, fats and oils from wastewater by mechanical treatment, such as grilles, precipitation or air flotation. Only in this way can follow-up work be carried out. The working principle of the grille decontamination machine is that a unique rake factory is assembled into a group of revolving grille chains. Under the drive of the motor reducer, the chain of the rake chain turns against the water flow. When the rake gear chain runs to the upper part of the equipment, due to the guidance of the groove wheel and the bent rail, the relative self-cleaning movement occurs between each group of rake teeth, and most of the solid materials fall by gravity. The other part relies on the reverse movement of the sweeper to clean up the debris stuck to the rake. The rake gear chains in the direction of water flow are similar to grids, and the rake gear clearance assembled on the rake gear chain shaft can be selected according to the operating conditions. When the rake teeth are separated from the solid suspension in the fluid, the flow can flow smoothly.