在批修整风运动的推动下和国内外一派大好形势的鼓舞下,我国煤炭工业也呈现出一派欣欣向荣的大好形势,广大煤矿职工积极响应毛主席关于“开发矿业”的伟大号召,开展技术革命和技术革新。为了加快煤巷掘进的速度度,采用了喷射混凝土这一项先进的支护新技术,而混凝土喷射机是喷射混凝土工艺的关键 Under the encouragement of the rectification movement and the favorable situation at home and abroad, China’s coal industry has also shown a flourishing situation. The majority of coal mine workers actively responded to Chairman Mao’s great call for “developing mining” to carry out the technological revolution and Technological innovation. In order to speed up the speed of coal roadway excavation, the advanced technology of shotcreting is adopted, and the concrete jet is the key to the shotcrete process.