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顶板警报器用在采矿场上,可以帮助凿岩工人监视顶板的变动情况,维护工人作业安全。它是用木材制成的,使用方便,动作灵活。制作也很简单,即用方木三根,二根与底板相连接做成固定底柱,另一根方木与上部顶板相连接做成活动顶柱插入固定底柱的中间(图1),可以上下伸缩,使之适合顶板与底板的距离。。中间安装简单的电气装置,一个电铃,二个灯头,可安插二个不同同颜色的灯泡,电气线路的连接如图2。在固定底柱的顶端安
Roof sirens are used in mining sites to help rock drillers monitor roof changes and maintain worker safety. It is made of wood, easy to use, flexible action. The production is also very simple, that is, with three wood, two connected with the bottom plate made of fixed bottom column, the other side of the wooden roof and the top plate connected to the activities of the top pillar into the middle of the fixed pillar (Figure 1), you can Scales up and down, making it suitable for roof and floor distance. . The middle of the installation of simple electrical installations, an electric bell, two lamp, can be inserted into two different colors of light bulbs, electrical connections in Figure 2. Safety at the top of the fixed column