我厂有四台一般常规的电葫芦式天车,其上升限位器工作很不可靠。经常发生跑偏,滑轮碰不着限位撞铁,而将上升限位器撞坏。轻的撞坏壳体,重的连钢丝绳也被拉断。后来经过工人、技术员、干部三结合小组多次实验,改成可控硅限位器。如右图所示: 经生产实践证明,这种限位器结构简单, I plant has four general conventional electric hoist crane, the rise of the stopper work is not reliable. Deviation often occurs, the pulley hit the limit hit the iron, but will rise crashing stopper. Light crashed shell, heavy wire rope also pulled off. Later, after workers, technicians, cadres and three groups of small experiments many times, into a silicon limiter. As shown on the right: The production practice has proved that the stopper structure is simple,