目前国内污水管道多采用铸铁管,管道直径一般为50～150mm。由于管道的规格、长度尺寸是一定的,而楼层的高度不同,铺设的管道不可能恰好合适,其截断的方法通常用手锯、凿子截断或气割,费时费力而且断口不平齐,这是施工中一直未解决的难题。北京市第五建筑公司在某外事工程施工中受到了启发,和航空航天部634所联合研制了 SD50～150链式铸铁管切割机,经过一年多的工程应用,深受工人好评,现在已批量生产,年产600台。工作原理和结构切割机由两个内臂和两个外臂组成一个支架(见附图),上端有加压手柄,加长了力臂,用手加压就可产生很大的力矩。和加压手柄相连接的是棘轮箱,内装有 At present, the domestic sewage pipelines mostly use cast iron pipes, and the pipe diameter is generally 50 to 150 mm. Because the size and length of the pipeline are constant, and the height of the floor is different, the pipeline laid may not be exactly suitable. The method of cutting is usually cut by hand or chisel, cutting or gas cutting. It is time-consuming and laborious and the fracture is uneven. This is the construction. Unsolved problems. Beijing Fifth Construction Co., Ltd. was inspired by the construction of a foreign project. The SD50-150 chain cast iron pipe cutting machine was jointly developed with the 634 Department of Aerospace. After more than a year of engineering application, it was highly praised by the workers. Mass production, with an annual output of 600 units. Working principle and structure The cutting machine is composed of two inner arms and two outer arms that form a bracket (see the attached figure). The upper end has a pressure handle, and the arm is lengthened. Pressing it by hand can generate a large torque. Connected to the pressure handle is a ratchet box