Study On Evaluation Method Of Drum Strength Of Disc Centrifuge Based On Material Properties

Drum is the core of the disc separator,and the drum withstands the great force caused by their own and the centrifugal force of the material when rotating high at work,and it easily leads to extremely serious reliability problems.In order to prevent safety accidents,the separation machinery industry develops corresponding drum strength calculation specification.But the calculation formula used in the calculation specification is not yet perfect.Therefore,it is necessary to further explore a more perfect method of strength assessment to reduce the risk of part failure and to prevent overly conservative calculations.The contents and achievements of this paper are as follows:(1)The problems existing in the analysis and evaluation of the drum strength of the disc separator are discussed,and the necessity of the strength evaluation of the disc separator is pointed out.The comparison and evaluation methods of the drum strength of the two separators are compared,and the calculation of the drum strength of JB/T8051-2008 centrifuge is relatively conservative and verified by a case.Moreover,the yield ratio of different materials is different,the calculation of allowable stress is also different.Therefore,the typical material of the disc separator is subjected to material tensile test,and the plastic behavior of the material is idealized.(2)According to the basic mechanical properties of the disc separator materials,the rectangular section beam is taken as the object of study,and the idea of the limit design method and the steady state is used.The stress analysis method of the ideal elastic-plastic material and the true stress-strain model is studied under three different working conditions: simple drawing,pure bending and tensile-bending combination.As most of the metal materials have a strengthening process,so the use of reinforced elastoplastic material for strength assessment,is more able to tap the material carrying capacity.(3)Based on the true stress strain curve of the material,the finite element simulation of a certain type of disc separator in the idle drum rotation and normal working conditions are carried out respectively.It obtains the stress results in the dangerous section and analyzes it.The design limits of the rectangular section beam under the ultimate load are compared,and the result shows that the design limitation can be used for the evaluation of the strength of the disc separator.At the same time,according to the traditional stress intensity assessment,calculating the disc separator drum limit speed.Comparative analysis finds that the traditional stress intensity assessment method is too conservative,resulting in material waste.(4)Aiming at the difficulty of stress test in the case of running drum,the dynamic test of drum stress is carried out,and the finite element simulation is carried out.The stress and strain data of the drum under different rotational speeds are obtained by WiFi wireless communication technology,and the results are compared with those obtained by JB/T 8051-2008 "Calculation formula of centrifuge drum strength" and finite element simulation analysis.Based on the material properties,this paper studies the method of assessing the drum strength of disc separator,and avoids the error caused by conservative calculation to a certain extent.At the same time,the strain-strain test data of the drum-type separator drum in the rotating condition are obtained by using the wireless communication technology.In the next stage,we will have the operating fluid and the working fluid under normal conditions to further carry out the electrical test,to improve the finite element analysis,as a disc separator drum engineering application reference.