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图1所示弯管器由本体6组成,其一端带有手柄5,另一端带有支承爪1和支撑爪8。支承爪工作部的形状由直径为D的圆心角a等于180°这一部分弧长组成,而支撑爪工作部则由圆心角β等于120～150°的另一部分孤长组成。圆的直径D等于所安装管子7的直径。β角的大小根据本体两爪间的跨距L选取,而L由管子最
The pipe bender shown in FIG. 1 is composed of a body 6 with a handle 5 at one end and a supporting pawl 1 and a supporting pawl 8 at the other end. The shape of the working part of the supporting pawl is composed of a part of the arc length of the central angle a with a diameter D of 180 ° and the working part of the supporting pawl is composed of another part of the long axis with a central angle β equal to 120-150 °. The diameter of the circle D is equal to the diameter of the installed tube 7. The size of the beta angle is chosen according to the span L between the two jaws of the body, and L is the most by the tube