| Nuclear power station currently has been running for five or six years in the word. it made a great contribution to solve the energy problem of mankind, but the life of the nuclear facilities is limited.A large number of nuclear facilities will to be retired, so nuclear radiation machinery tools are needed for the retired construction; and the operating of nuclear power plants maybe leakage accident occurred, also are needed for construction treatment. Nuclear power plants are filled with a lot of radiation, if the construction or preventive measures are not proper, will bring great harm to human body.Therefore, according to the above situation is to set up the subject, the main task is to develop a safe operating equipment in the radioactive environment, radiation protection excavator. For the main work is to study of excavator cab radioactivity shielding, steel grids structure design,the cab structure and mechanical properties analysis. The main research contents of this paper are as follows:(1)The radioactive material of excavator cockpit is shielded.Anti-radiation is one of the important research projects in this word.Currently, there are a plenty of anti-radiation material, including polymermaterial, but the excavator should choice appropriate anti-radiation material that achieve cheap and reach the requirement of anti-radiation.The Material selection of industrial pure lead, the purity of 99% and thickness is 22 mm.(2) the design of anti vibration high strength composite steel plate.Lead parameters: length is 1.8m, width is1.6m and thickness is 22 mm,weight is 718 kg. lead hardness is low and easy to deformation. In order to solve the problem, designing the composite steel plate. In the Steel box inside the wall, welding 22 bending steel(steel plate). Lead and steel plate are combined together by strengthening the bending steel sheet.(3) The binding force of experimental composite steel grids.Experiments and measured without fastening plate bending when,stereotype and plate combination of force coefficients for 389(N/m2);when a fastening plate bending and the binding force is about 3553 N. For different steel plate, bending plate fastening maybe different the number of welding.(4) The finite element analysis of composite steel plate. Using finite element analysis software for simulation stretching of the composite steel grids. By comparing the simulation results and experimental results, The analysis error is about 8%, So the different bending angle analysis is to provide reference data for the design. The composite steel grids harmonic response analysis and the results of the analysis of two different situationsfrequency are difference about 9.5Hz and 22.7Hz. therefore it will not cause resonance.(5) The finite element radiation proof composite steel sheet cab analysis. Composite steel grids cab analysis: mainly for roll-over protective structure, falling-object protective structure, deflection limiting volume. The analysis showed that the maximum deformation of the ROPS was 14.4mm, smaller than the spatial distance 262mm; the FOPS maximum deformation was 59 mm, smaller than the spatial distance mm,the deformation will not invad cockpit the DLV and protect the safety of staff. |
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