消火车道的检道清扫工作,每天都必须进行。消火车速度快、往返频繁,检道的危险性很大,虽然制定了检道牌制度等一系列安全措施,但没有从根本上解决问题。长期以来,在消火车线上多次发生死亡、致残、重伤等恶性事故,是我厂安全工作的薄弱环节。为了确保检道工人的安全,我们在消火车上安装了一台检道自动双音讯响报警器,经过一段时间的试用,效果良好,受到了工人的欢迎。现将其电路的设计思想和基本原理作一介绍。 Check the fire lane cleaning work every day must be carried out. Speeding train speed, frequent trips, seized dangerous, although the development of a series of measures such as check-card system, but did not fundamentally solve the problem. For a long time, there have been many deaths, disability and serious injuries on the line of fire-fighting trains. These are the weak links in the safety work of our factory. In order to ensure the safety of prosecutors, we installed an automatic dual tone audible alarm on the fire-extinguishing train. After a period of trial, the effect was good and was welcomed by the workers. Now the circuit design ideas and basic principles for an introduction.