以前每个厂的弯头大部分都是使用铸石弯头，这种材料的特点是易碎、开裂，而且磨损面背包，壁厚25-35毫米，有的近40毫米，内侧短时间磨破开裂后，煤粉随着缝隙向外侧磨损，其寿命也就只有一个大修期。而且内部常有气孔，易留隐患，一旦磨穿，现场无法修补。

In the past, most elbows in every factory were made of cast stone elbows, which were characterized by fragility and cracking, and worn backpacks with a wall thickness of 25-35 mm, and some of them were zhongyaoji.37ix.com.cntongdiaopin.71ix.comhugan.37ix.com.cngxianwei.37ix.com.cndiaosuoju.37ix.com.c

nhandan.37ix.com.cnnearly 40 mm. After a short time of wearing and cracking on the inside, pulverized coal wore out along with the cracks on the outside, and its service life had only one overhaul period. And there are often air holes in the interior, which are easy to leave hidden dangers. Once worn out, the site can not be repaired.