| 摘要 |
1,034,247. Handling radioactive materials. COMMISSARIAT A L'ENERGIE ATOMIQUE. Sept. 4, 1964 [Sept. 27, 1963], No. 36378/64. Heading B4Q. A manipulator installation for handling radioactive material comprises a casing having a lateral wall 38, a horizontal diaphragm 10 formed of a non-ferromagnetic material across the top of the easing, a frame 14 which is rigidly secured to the wall 38 and to the diaphragm 10 and which induces tensile stresses within the diaphragm 10, and a manipulator 42 consisting of a driving head above the diaphragm 10 magnetically coupled to a driven head below the diaphragm 10, small wheels carried by the heads maintaining them a constant distance apart. The tensioning of the diaphragm 10 prevents the thrust exerted by the wheels from causing any deflection of the diaphragm. Prior to the mounting and fixing of the diaphragm 10, the frame 14 is fitted with pairs of cables 18 connected at adjacent ends by means of turnbuckles 16 and at opposite ends by means of screws 22 to opposite sides of the frame 14. When suitable tension has been applied to the cables 18 by means of the turnbuckles 16, the diaphragm 10 is secured to the frame 14 by means of screws 12, after which the tumbuckles 16 are slackened off and the cables 18 detached. The diaphragm 10 is thus subjected to a tensile prestressing which prevents its deflection so long as the load to which it is subjected does not induce any stress higher than the prestress applied by the frame. The installation is surrounded by an outer shield structure 34 of substantial thickness, being formed of cast iron, for example, and fitted with an inspection window 36. The wall 38 of the inner casing consists of stainless steel plate and is provided with inspection windows 40. A suitable non- ferromagnetic material for the diaphragm 10 is an alloy containing 26À4% nickel, 15% chromium and a small proportion of manganese, molybdenum and titanium. |
