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我矿梅子窝坑口的竖井口,自1978年使用井口安全门以来,上下罐没有发生过任何安全事故。安全门系用3/8或1/2英寸钢管焊成,安装在距离井口500毫米处,如附图。
I mine plum pit pit shaft mouth, since the use of wellhead safety door in 1978, the upper and lower tank has not occurred any safety incidents. The safety door system is welded with 3/8 or 1/2 inch steel pipe and installed 500 mm from the wellhead as shown in the attached figure.