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本发明是一种机械式扩管机,用于对钢管进行步进式扩径,它装有一个扩径头,这个扩径头由一个棱锥体和装在其上的可径向移动的扇形块组成。扇形块装在液压缸的空心伸臂上,而空心伸臂里的连接杆把棱锥体与液压缸的活塞和用于步进式移动钢管的运输设备连接起来。现有的扩管机(例如众所周知的 DT—AS2264207型扩管机),仅用于直缝焊管的扩径,不适用于螺旋焊管的扩径,因为螺旋焊管内表面具有螺旋形焊缝,并且在两条相邻的螺旋焊缝之间至少有一条垂直的横向焊缝。这种超出带钢表面的焊缝对扩管有干扰。此外,外表面的焊缝妨碍管子的夹装和送进。
The present invention is a mechanical pipe expanding machine for stepwise expansion of a steel pipe which incorporates an enlarged head consisting of a pyramid and a radially movable sector composition. The fan-shaped block is mounted on the hollow boom of the hydraulic cylinder while the connecting rod in the hollow boom connects the pyramid with the piston of the hydraulic cylinder and with the transport equipment used to move the steel pipe step-by-step. Existing pipe expanding machines, such as the well-known type DT-AS2264207 pipe expanding machine, are only used for expanding the diameter of the longitudinal welded pipe, and are not applicable to the diameter expansion of the spiral welded pipe because the inner surface of the spiral welded pipe has a spiral weld, and At least one vertical transverse weld between two adjacent spiral welds. This weld beyond the surface of the strip interferes with the pipe expansion. In addition, the outer surface of the weld hinders the pipe clamping and feeding.