Research On Reliability Design Of Feeding System Turnover Mechanism Of Horizontal Laser Shearer For Spent Fuel After Treatment

In the field of nuclear power,spent fuel post-processing shears are key equipment for the spent fuel reprocessing of power reactors.Shearers work under complex operating conditions such as bad,heavy load,and radioactive environment,and the reliability of the system directly determines The shearing efficiency and working performance of the shearing machine can also be affected by the safety,stability and reliability of its own use.In order to solve the problems that uncut components are transferred into the dissolver and the wear of the tool carrier roller during the feeding system of the spent fuel aftertreatment vertical shearing machine,this paper proposes a scheme for the feeding mechanism turnover mechanism of the horizontal shearing machine.Spent spent fuel assembly from vertical cutting to horizontal laser cutting.Aiming at the working process of the feeding mechanism turnover mechanism of the horizontal shearing machine,the reliability design method based on the shearing machine turnover mechanism and the maintainability design method of the system arestudied.First of all,this paper proposes the design and working principle of the turning mechanism of the feeding system of the horizontal laser shearing machine,and modularizes the turning mechanism of the feeding system of the horizontal laser cutting machine according to the modular design concept and the characteristics of easy disassembly and maintenance.design.The influence of the failure of important parts and subsystems of the shearing machine turnover mechanism on the reliability of the complete machine is analyzed.The reliability model of the system is established based on the reliability design criteria,which provides a theoretical basis for the reliability calculation of the subsequent system.Secondly,the fuzzy comprehensive evaluation method is applied to the reliability distribution of the feeding mechanism of the shearing machine.Fault tree analysis is used to obtain the faults and weak links of the important parts of the shearing machine turnover mechanism.The fault mechanism model of the lifting mechanism and traversing mechanism in the mechanism is used to perform the minimum cut set and the importance degree of the mechanism.The stress-strength interference model is used to design the reliability of the key components of the horizontal shearing mechanism.The calculation results obtained under the traditional safety factor method are comparedto analyze the superiority of the reliability design method.Finally,the qualitative and quantitative analysis of the maintenance requirements of the feeding mechanism of the horizontal laser shearing system is carried out.The different methods of maintenance distribution and prediction are introduced,which provides a basis for the maintenance design of the horizontal shearing mechanism.Using the weighted factor allocation method based on the failure rate and design characteristics,the maintenance distribution of the shear turnover mechanism is performed to obtain the distribution result,so that the maintainability of the system can be reasonably and effectively allocated to each unit,and at the same time,the current shear system is In the absence of maintenance data,the use of unit-to-projection method for maintenance predictability provides a method for maintenance distribution and prediction in the field of spent fuel aftertreatment shears.