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矿井生产是地下作业,经常受到瓦斯、煤尘、冒顶、火、水等灾害的威胁.在资本主义制度下,矿工的安全和健康没有保障,煤矿是伤亡事故最严重的一个工业部门.如美国本世纪以来,煤矿事故死亡人数已达十万人,日本煤矿近十年中伤亡事故高达四十万人次。近年来,资本主义国家的煤矿垄断资本集团,为了保护价值昂贵的机器设备,并在规模空前的矿工罢工斗争的冲击下,不得不注意改进安全技术,煤矿死亡事故有所减少。此外,资本主义国家的煤矿垄断资本集团为了获取更大的暴利,逐渐推广了综合机械化采煤方法,使用了液压支
Mine production is an underground operation and is often threatened by disasters such as gas, coal dust, roof collapse, fire and water etc. Under the capitalist system, the safety and health of the miners are not guaranteed and the coal mine is one of the most serious industrial accidents involving casualties such as the United States Since the beginning of this century, the number of deaths in coal mine accidents has reached 100,000. The number of casualties in Japanese coal mines has reached 400,000 in the past decade. In recent years, coal monopoly capital groups in capitalist countries have to pay attention to improving safety technology and reduce coal mine fatalities in order to protect expensive machinery and equipment under the impact of the unprecedented miner strike. In addition, the coal-mining monopoly capital groups in capitalist countries gradually promoted the comprehensive mechanization of coal mining methods in order to obtain greater profits and used the hydraulic branch