通风管道安装工作,需要大量扁铁法兰。过去一直用人工煨制,一个技术熟练的工人每天只能煨制φ300毫米的法兰20多个,跟不上生产发展的需要。经过无产阶级文化大革命和批林批孔运动,大大激发了广大革命职工的社会主义积极性。遵照毛主席关于“自力更生,艰苦奋斗,破除迷信,解放思想”的伟大教导,我们利用废旧材料,制作了扁铁煨圆机 Installation of ventilation ducts requires a large number of flat iron flanges. In the past, it had been artificially tampered with. A skilled worker could only make more than 20 flanges with φ300 mm per day, which could not keep pace with the needs of production development. After the Great Proletarian Cultural Revolution and the approval of Lin Piao and Confucius Movement, it has greatly stimulated the socialist enthusiasm of revolutionary workers. In accordance with Chairman Mao’s great teaching of “self-reliance, hard work, breaking down superstitions, and emancipating the mind”, we made use of scrap materials to make a flat iron circular knitting machine.