汽包盖座是用栽丝装在汽包胴体上的。友好型机车原设计为24个带锥度的1时螺柱、按照螺纹公制化办法规定要改为M24的螺柱。由于汽包口上栽丝孔的改造比较困难,我厂采用了切换汽包圈的办法(图1),即将原汽包口切除,加装一个锻制的或铸钢的圈,这个汽包圈可以在事先加工完,作成备品,当锅炉进厂后就可以切换,不影响锅炉拆、修、装及其他工作。由于栽丝孔是不透孔,栽丝深度为30毫米,所 Drum lid seat is installed in the drum on the carcass. The friendly locomotive was originally designed with 24 studs with taper at 1 o’clock and was changed to M24 studs according to the thread metric. As the drum hole on the mouth of the transformation of the more difficult, I use the factory to switch the method of steam ring (Figure 1), about the original steam mouth cut, the installation of a forged or cast steel ring, the steam ring Can be processed in advance, made of spare parts, when the boiler into the plant can switch, does not affect the boiler demolition, repair, equipment and other work. As the planting hole is impermeable, planting depth of 30 mm, the