Research And Design On Lifting Equipment Of Desilting Pump In PX Pump House Of Nuclear Power Station

During each overhaul of PX pump room of Qinshan nuclear power phase II and Fangjiashan nuclear power 6 units,desilting treatment shall be carried out for the water chamber under the grid cleaner.For the lifting of submersible pump,scaffold shall be set up in advance in the early stage,and more than 40 people shall be put into the work,which has low working efficiency and high labor intensity,and affects the manpower allocation during overhaul.The construction environment of desilting pump room is narrow and the operation is near the edge,so there are quality and safety risks in the improvement of manpower.Due to the limitation of space and transportation,the lifting equipment on the market can not meet the requirements of the field lifting and dredging equipment.Now it is necessary to develop a dredging pump lifting equipment which is easy to transport and operate,which can save manpower investment,improve site work efficiency,reduce labor intensity,and ensure construction quality and safety.After the successful development of the equipment,it is expected that four staff can complete the equipment reshipment and the lifting and lowering of dredging equipment,improve efficiency,reduce costs and reduce operational risks.(1)According to the task requirements and work plan of the project,the research content,the overall structure and technical scheme of the equipment,the design idea,the implementation scheme,the prototype manufacturing and the test scheme are demonstrated in many aspects,and the overall certification of the equipment is confirmed to meet the acceptance of industrial safety.(2)The three-dimensional model created in SolidWorks is imported into ANSYS Workbench to simplify processing and carry out modal analysis and stress-strain analysis.It is compared with the test data obtained from the vibration test of the prototype to verify the correctness of the finite element analysis.Taking the expansion arm of the lifting equipment of nuclear power plant as the research object,the target parameters are set as the volume and mass of the cantilever beam,and ANSYS Workbench is used for parametric design and solution.In the case of surplus of total stress and total displacement,the thickness of the section size of the cantilever beam is taken as the design variable for size optimization,so as to achieve the design requirements of lightweight.(3)In this paper,based on the computer MATLAB software,in the Simulink simulation environment,the vibration signal of the lifting equipment is collected by the circuit of data acquisition card and sensor,and the frequency spectrum of the vibration signal of the lifting equipment is obtained;the program is compiled in the editing interface of MATLAB software by using the principle of Fourier transform,and the original frequency spectrum is analyzed in time domain The frequency domain analysis and filtering processing can get the frequency domain and time domain diagram of the vibration signal,which will lay the foundation for the next step of analyzing the vibration frequency of the lifting equipment and avoid the resonance of the natural frequency close to the modal analysis,which will cause damage to the equipment.