Design Of High Precision Neutron Catheter Splicing System

The neutron guide is the core equipment on the neutron scattering spectrometer device,and is an important optical component for the quality control of the neutron beam.When the neutron beam is transported from the neutron source channel to the sample detection position,the time characteristics,space characteristics,beam flux,divergence and other important physical parameters of the neutron beam of the spectrometer are effectively controlled,which directly determines the final physical performance of the neutron spectrometer.According to the technical indicators and performance requirements of the neutron guide,this thesis designs and completes a high-precision neutron guide splicing system,which includes 500 mm splicing tooling,2000 mm splicing tooling and an online measurement system that can effectively integrate with the splicing tooling.The splicing system can complete the splicing of a complete 2000 mm neutron guide,and the precision of the guide tube meets the design index and functional requirements.The main research contents include:Firstly,according to the composition and working principle of the conduit,the requirements for the splicing accuracy of the conduit are put forward.From the analysis of the need to realize high-precision splicing,the glass type of the conduit,the connection structure between the glasses,the type of adhesive and the sizing process are determined.Then,the structural design of splicing tooling and the selection of measuring instruments are determined in detail by means of scheme comparison.Secondly,according to the structural design scheme of the splicing tooling,adopting the modular design concept and following the design criteria of interchangeability and versatility,the overall structure design and key component design of the 500 mm splicing tooling and 2000 mm splicing tooling were completed using SolidWorks,and the principle of using the splicing tooling to achieve high-precision conduit splicing was introduced in detail.In the design of the key components of the 500 mm splicing tooling,the stroke design,the positioning structure design,the limit structure design and the introduction of the use of the fine adjustment elements are completed in turn.At the same time,the connection relationship between the components is explained by taking the left and upper glass support adjustment mechanism as an example,and the force analysis and spring calculation and selection of the guide mechanism are carried out.In the design of key components of 2000 mm splicing tooling,the design of rack,marble platform,marble positioning block and adjusting element support is completed in sequence.Thirdly,use the finite element analysis software Workbench to carry out the static analysis of the key bearing parts in the tooling,including the box body of the500 mm splicing tooling,the support platform and the frame structure of the 2000 mm splicing tooling.The results show that the mechanical structure design is reasonable and can ensure the long-term safe and reliable use of the device.Then,the support platform and gantry structure of the 500 mm splicing tooling are analyzed for local one-way deformation to determine whether the jacket splicing accuracy is affected by structural deformation during the jacket splicing process.The results show that the deformation is within 3 microns,meeting the use requirements.After that,simulate the splicing state of the guide tube on the support adjustment mechanism,and compare the deformation of the glass by applying different adsorption forces on the glass,so as to provide a basis for the design of the adsorption force of the vacuum system,and at the same time verify the rationality of the design of the support adjustment mechanism.Then,based on the structural design of the splicing tooling,combined with the use of the grating displacement sensor,the overall scheme design of the measuring system is completed.Then,the supporting structure design of the sensor and the software and hardware design of the measurement system are introduced in detail.In the software design,the Matlab App Designer is used to establish the communication between the sensor and the host computer based on the Modbus communication protocol to achieve the data reading and writing function,and the real-time online measurement and parameter calculation function of the high precision middle duct is completed based on the least square plane fitting principle,distance measurement principle,perpendicularity and parallelism measurement principle.Finally,complete the design of vacuum pneumatic system and trial-manufacture of tooling prototype.According to the technical requirements of structural design,vacuum system circuit and measurement system wiring design,successively complete the construction of 500 mm and 2000 mm high-precision neutron guide splicing platform.Then conduct conduit splicing experiments on the splicing tooling according to the splicing principle of 500 mm and 2000 mm conduits,and complete the conduit splicing work.During the splicing process,the splicing parameters of the conduits are recorded in detail,and the splicing accuracy of the conduits is finally checked by using three coordinates at the Xuzhou Metrology and Testing Center.The test results show that the accuracy of each index of the 500 mm and 2000 mm guide tubes meet the requirements of the guide tube design,which further verifies the feasibility of the design of the high-precision neutron guide splicing system.