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一、加宽钎头过去,我们打炮眼用的铜钎钎头,宽度在4厘米以下,上了4厘米的都很少。现在革新了一下,加宽到6～8厘米。窄钎头只是打眼的工效高,爆破效能极低,它主要缺点是装药不能集中,故抵抗线不可能放大,大了就炸不开。在坚石地方用细炮眼,其抵抗线假若大于2米,则无论你打多深的眼子也是炸不掉石头的。普通用的28毫米的八角钢,钎头可以铣成6～8厘米。不过,只烧一次火不行,得烧三、四次,烧红后先把头子捣粗,再打钎口,否则打出的钎口太薄,两个角容易磨损。钎口以平头式略带弧形最好。 6～8厘米宽的钎头,其炮眼位的抵抗线可到3～
First, to broaden the bit in the past, we hit the hole with copper brazing drill head, the width of 4 cm below, on the 4 cm are very few. Now a bit of innovation, widened to 6 to 8 cm. Narrow bit just drilling eye work efficiency, blasting efficiency is very low, its main disadvantage is that the charge can not be concentrated, so the resistance line can not be enlarged, the big fried can not be opened. Fine stone in the stone place with the resistance line if the line is greater than 2 meters, no matter how much you play too deep eye can not afford to explode the stone. Ordinary 28 mm octagonal, bit can be milling into 6 to 8 cm. However, only a fire can not burn, have to burn three or four times, after burning the head tossed rough first, then play brazing mouth, or play brazing too thin, easy to wear two corners. Brazing mouth to flat slightly curved the best. 6 ~ 8 cm wide bit, the gun line of resistance to the line can be 3 ~