井盖，用于遮盖道路或家中深井，防止人或者物体坠落。按材质可分为金属井盖、高强度纤维水泥混凝土井盖、树脂井盖等。一般采用圆形。可用于绿化带、人行道、机动车道、码头、小巷等。
　　箅子在过去一般是指由切割、打磨好的竹片，纵横两层扣接在一起，架在锅、釜、鼎等炊具中，用以蒸焖食物的炊具，多为圆形。现在出现了一些聚合材料、 铁、铝、不锈钢等合金材料制成的箅子，加上边框，便成其为笼屉了。在这里，箅子的作用，主要是支撑起食物，便于水蒸气和热量更好地被食物吸收。
　　另外，箅子也出现在给排水设施设备名称、机械设备名称之内，如镂空的窨井盖可以叫箅子，水管中用以过滤杂质的金属网可以叫箅子，水龙头上的过滤头子也可以叫做箅子，油箱口上的金属网也叫箅子。在这里，箅子的作用，主要是过滤。

　　Well, for covering deep road or in the home, to prevent falling person or object. According to the material can be divided into metal, high strength fiber cement concrete manhole covers, resin covers etc.. General circular. Can be used for green belts, sidewalks, motor vehicles, docks, alleys, etc..

　　Grate in the past generally refers to the polished by cutting, a good piece of bamboo, vertical and horizontal layer buckled together, stand in the pot, kettle, pot, cookware, to steamed braised food cooker round. Now there are some polymerization is made of alloy materials, iron, aluminum, stainless steel and so on material grate, add borders, into the steamer for the. Here, the grate role, mainly to support the food, water vapor and heat for better absorption of food.

　　In addition, grate also appeared within to name of the drainage facilities equipment, machinery and equipment name, such as hollowed out of the manhole cover can be called grate, pipe with metal mesh filter impurities can be called the grate, tap filter leader can also called grate, the fuel tank mouth of metal mesh is also called the grate. Here, the effect is mainly grate, filter.