| 摘要 |
PURPOSE:To permit the reasonable passing in the bent tube part of an inspecting pig by allowing a trunk body to freely shift in eccentric form in the radial direction in which an external force acts, for the flanges at both the edge parts of the pig shaft, when the external force in the radial direction acts on the trunk body, during the passing in the bent tubular part having a small radius of curvature. CONSTITUTION:A plurality of copying devices 15 are installed in symmetry in the axial direction on the outer periphery of an inspecting pig trunk body 7 having the first flanges 1 fixed at the front and rear parts, and the edge part of the copying device 15 is directed in the radial direction and supported by a spring. Further, the third flanges 3 are fixed at both the edges of an inspecting pig shaft 10, and a cup C is fixed on the outside of the third flange 3. The second flange 2 is interposed between the first and third flanges 1 and 3, and coil springs 5 and 6 are interposed between the first and second flanges 1 and 2 and between the third and second flanges 3 and 2, respectively, and the first and third flanges 1 and 3 can be slided vertically for the second flange 2. Accordingly, when an external force F acts, the force is received by the copying device 15, and the trunk body 7 can be set eccentric for the pig shaft 10 by pushing the trunk body 7 downward. |
