要使具有自动进给的深孔钻专机有较高的生产率,往往采用过扭矩保护装置来控制钻头的自动进退。采用载荷继电器具有结构简单、调节方便等优点,还能通过电流表直观地反映钻孔过程中的扭矩变化,起到监视作用。使用载荷继电器时,要使电机的额定功率接近实际负载。不能贪求保险选用较大功率的电机。实际负载可按钻头直径、材料和切削用量来计算,也可用电流表实际测定,电流表的 To make deep hole drilling machine with automatic feed has a higher productivity, often used torque protection device to control the drill automatically advance and retreat. The load relay has the advantages of simple structure, convenient adjustment and the like, and can also directly monitor the torque variation in the drilling process through the ammeter, thereby playing a monitoring role. When using a load relay, make the rated power of the motor approach the actual load. You can not insure the insurance choose a larger power motor. The actual load can be calculated according to drill diameter, material and cutting amount, but also can be measured by ammeter,