Structural Analysis And Optimal Design Of Quick Clamp Open Structure In High Temperature

As a key equipment in smelting industry,the performance of high temperature and pressure vessel directly determines the properties of the sintered material.The clamps quick open-closure device as the key part for sintering and charging of High temperature and pressure vessel that is used to most frequently in smelting process.Its performance will influence the sintering quality and efficiency of the high pressure sintering furnace.Therefore,the research focus of pressure vessel is focused on the quick opening structure of clamp.With the progress of heat treatment technology,higher requirements have been put forward for the development,manufacture and other aspects of the new type of high temperature and pressure vessel.It was briefly described that the working principle of pressure vessel and the classification of the quick opening structure as well as the research status of the quick opening structure.And it was also briefly explained the optimization design technology.It was summarized the design standard of pressure vessel and the standard of stress evaluation.The geometry model of the prototype was established by using ANSYS finite element software.The 1/12 in the circumferential direction was selected as the object of the study of the quick opening structure,and the mesh was divided and the contact pairs were selected.The stress distribution on the clamp was obtained by loading the mechanical load and the applied condition.According to the standard of the strength check of JB4732-1995 "steel pressure vessels analysis design standard" to select the wire stress evaluation method processing,and select 17 dangerous path on the interface stress evaluation.The results show that the stress on the path is all in the allowable limit,and proved that the clamp structure meets the strength requirement.It was used the thermal mechanical coupling to made a analysis of the quick opening clamp structure,that the technical load was applied to the clamp quick opening structure,which under the environment of temperature field.Through the analysis and calculation of ANSYS finite element,the temperature field and stress distribution of the clamp structure were obtained.In the condition of thermal mechanical coupling,the maximum stress was located in the upper clamp tooth position.The same 17 paths were selected to check the strength,the results show that the stress paths are in the allowable limit,and also proved that the quick opening clamp structure to meet the requirements of the thermal mechanical coupling with the strength,and has a large optimization space too.Then in the selection of thermal mechanical coupling condition should be assessed analysis of the maximum stress point as fatigue,according to JB4732-1995 "steel pressure vessels analysis design standard" on the theory of fatigue analysis,made a fatigue determination for the clamp quick release structure.The results show that the cumulative damage of hoop coefficient is 0.89.It is verified that the quick opening clamp structure meet the fatigue strength.Finally,it is used the Solidworks to define the design variables as data that can be directly identified,and used the ANSYS Workbench to optimize the design of high pressure sintering furnace structure.Regard The total mass,maximum stress,displacement and strain of the clamp quick opening structure are selected as the target quantity.The outer diameter of the clamp,the thickness of the clamp tooth,the transition arc radius of the clamp root and the length of the transition arc length are taken as the design variables.The sensitivity of the target quantity and the design variable is analyzed,and the relationship between the target quantity and the design variable is studied respectively.The conclusion is consistent with the sensitivity analysis,and the accuracy of the analysis is proved.The automatic optimization of ANSYS finite element software,design variables of optimization of the clamps for outer diameter of 1625mm and radius 12mm,lathedog tooth thickness 41mm,arc length 38mm mouth,after optimization,the total mass of quick clamp open structure is reduced by 7.4%and 49.85Kg.