我热处理组用的电葫芦下降时只有一种速度,零件入淬火槽时速度太慢,经改进,做到了靠淬火零件自重快速下降,从而保证了淬火零件的质量(消除了软点,硬度均匀),同时减少了淬火油着火冒烟的污染。改进后电葫芦的电路接线如图,仅增加了两个交流接触器和一个按钮开关。当欲淬火的零件下降至油面一定高度时,断开下降开关,接通按钮开关AN,制动电磁铁线圈单独通电,摩擦片脱开,零件靠自重下降,速度越降越 My heat treatment group used only when the hoist down a speed, parts into the quenching tank when the speed is too slow, improved by quenching the weight of the rapid decline, thus ensuring the quality of quenched parts (eliminating the soft spots, uniform hardness ), While reducing the pollution of quenching oil on fire. Improved circuit diagram of the electric hoist shown in Figure, only added two AC contactor and a button switch. When the part to be quenched descends to a certain height of the oil surface, the drop switch is turned off, the switch AN is turned on, the brake electromagnet coil is energized alone, the friction plate is disengaged, the part descends by its own weight, and the speed decreases