“黑头砖”主要出现在窑底或火眼部位。黑头砖不仅严重影响产品质量,降低合格率,而且也浪费燃料。造成“黑头砖”的主要原因是码窑和投煤操作不当造成的。在码窑方法上,许多乡镇砖厂仍沿用“灯笼挂”腿子(即四行炕五行搭桥的码法)。靠窑底的一层是顶头连续码,每两坯之间都是一条两侧封闭的火道,燃料通过火眼投入窑底就落到这种通道中。投煤量稍大,两侧就堆积到 “Black brick” mainly appears in the bottom of the kiln or in the eyes. Black bricks not only seriously affect the quality of products and reduce the rate of passing, but also waste fuel. The main cause of “black bricks” is caused by improper operation of yard kiln and coal handling. In the yard-kiln method, many township brickyards still use the “lantern hanging” leg (ie, the four-line and five-line bridge method). The layer on the bottom of the kiln is the continuous code of the head, and between each two blanks there is a fire path that is closed on both sides. The fuel is thrown into this kind of channel through the fire eye into the bottom of the kiln. The coal amount is slightly larger, and the two sides are piled up