目前,在矿山天井掘进工作中往往用激光进行导向。不过,在各掘进循环之间,激光发生器要搬出搬进和重新调整。这不但花费时间,而且可能导致激光偏离原先的方向。 At present, the laser is often used to guide the work of mine shaft excavation. However, between each driving cycle, the laser generator to move out and readjust. This not only takes time but also can cause the laser to deviate from its original orientation.