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图1为过去的一种钢管切断装置斜视图,图2为过去的另一种钢管切断装置斜视图,图3为本发明的一应用例的平面图,图4为图3中Ⅳ—Ⅳ线的剖视图。本发明是谈及把带钢卷成螺旋状,同时焊成钢管,并不使焊管生产中止就把制成的钢管切成任意长的切断装置的改进。过去的螺焊管制造工程中用的切断装置如图1所示,沿钢管前进方向平行地铺设导轨2,切断装置设有框架18(此框架具有在导轨2上行走的台车16,其上有自由回转的
Fig. 2 is a perspective view of another prior art steel tube cutting device, Fig. 3 is a plan view of an application example of the present invention, Fig. 4 is a sectional view taken along line IV-IV in Fig. 3 Sectional view. The present invention relates to the improvement of a rolled steel strip wound into a helical shape while being welded into a steel tube without cutting the welded tube to cut the finished steel tube into an arbitrarily long cutting device. As shown in Fig. 1, the conventional cutting device for screwing pipe manufacturing works is laid with guide rails 2 parallel to the advancing direction of the steel pipe. The cutting device is provided with a frame 18 having a carriage 16 traveling on the guide rail 2, Free-swinging