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我厂在改装旧式锅炉时常遇到如图1所示的管接头焊接,其要求为:粗管 D 允许用气割开圆孔将细管 d 插入孔中焊牢;细管中心线 a-a 应垂直于管子 D 的中心线 x-x 所构成的平面 K。过去是用作图法求出两个管子的相贯线,做样板,然后用样板在粗管上画线,用气割割出圆孔d。这样干不但效率低而且质量差。后来经改进,采用了如图2所示的气割圆规,代替了原先的做样板、画线的工作,使效率和质量都有提高。4为滚珠轴承,用螺母8和背帽2将割嘴1固定在轴承4的内环上,轴承外环再加一外套7,其
I plant often encountered in the conversion of old boilers as shown in Figure 1, the joint welding, the requirements are as follows: thick tube D allows the use of gas cut open the hole into the hole d fine tube welded; thin tube centerline aa should be perpendicular to The plane K formed by the center line xx of the tube D. The past is used as a graph method to find the intersection of the two lines of pipe, make a template, and then use the template drawing on the thick tube, cut with a gas cut round hole d. This is not only inefficient but also poor quality. Later improved, using the gas cut compasses shown in Figure 2, instead of doing the original model, draw the line of work, so that efficiency and quality have improved. 4 is a ball bearing, the nut 8 and the back cap 2 will be fixed on the inner ring 4 of the bearing 4, the bearing outer ring plus a jacket 7, which