| 摘要 |
<p>The invention relates to a pipe cutting apparatus, comprising a tubular or box-like frame (1), a pipe clamp (9) inside the frame for immobilizing a pipe (P) to be cut, an annular blade carrier (3) rotatably bearing-mounted on the frame and provided with a central opening for the pipe to pass through, one or more blade arms (4) in attachment with the annular blade carrier (3) for movement mainly in a radial direction or in a slightly off-radial direction, a cutting blade (5) mounted on the blade arm (4), and means for actuating the blade arm (4) to enable feeding the cutting blade (5), rotating outside the pipe, towards the pipe for cutting the same by shearing. The means for ac-tuating the blade arm (4) include a spiral groove disc (6) rotatably bearing-mounted alongside the annular blade carrier (3), featuring a spiral groove (7) and a transition fin (8) extending from the blade arm (4) to the spiral groove (7), as well as elements (11, 12) for rotating the annular blade carrier (3) and the spiral groove disc (6) at a desired rotation speed ratio relative to each other.</p> |
