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见煤预告装置的原理是利用电流间断的流通,使电铃断续的响或使灯泡闪光,从单位时间内电铃响的次数或灯泡闪光的次数,来判别钻头尅取孔内岩石的级别。
The principle of seeing the coal forecasting device is to use the intermittent flow of current to make the bell ring intermittently or to make the light bulb flash, and to judge the level of the rock in the hole taken by the drill from the number of ringing of the unit per unit time or the number of lamp flashes.