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目前国内建筑安装单位加工通风及空调工程中的圆形咬口风管,基本上采用半机械手工操作,用标准薄钢板(1×2米或0.9×1.8米)裁剪制作。每节风管加工成型要经过七道工序,而且每节的长度限制在2米以内,一个系统中需很多法兰盘来连接。费工费时,劳动强度大,加工噪声大,有碍操作工人健康。六十年代后,一些国家研制成圆形螺旋咬口风管机,改变了原有的圆形风管加工方法,釆有一定规格的成卷带钢机械生产,制成的圆形风管咬口严密美观,质量好,风管刚
At present, the circular mouthpiece air ducts in the processing and ventilation and air-conditioning engineering of domestic construction and installation units are basically manufactured by semi-mechanical manual operation and cut out with standard thin steel plates (1×2 meters or 0.9×1.8 meters). Each section of the duct processing through seven processes, and the length of each section is limited to within 2 meters, a system requires a lot of flanges to connect. The labor-intensive and labor-intensive work requires a large amount of processing noise, which hinders the operation of workers. After the 1960s, some countries developed a spiral spiral mouthpiece air duct machine, changed the original circular duct processing method, and manufactured a certain amount of rolled strip steel machinery, made of round wind pipe bite The mouth is tight and beautiful, the quality is good, and the air duct is just