Research On Working Analysis And Structural Improvement Of Large Rotary Kiln

Mineral resources are non renewable resources,in order to ease the shortage of mineral resources,the low-grade ores utilization are an inevitable trend in today's society,metallurgical rotary kiln is being widely used.Rotary kiln is a large and heavy volume equipment,and the it is generally working under the open environment.In order to ensure the stable work,reduce weight and cost savings of rotary kiln,the axial glide of rotary kiln and the key components are analyzed of rotary kiln,and the thickness of the cylinder wall and the supporting rollers are improved.Rotary kiln are generally widespread axial glide phenomenon in work,and the axial glide of rotary kiln is analyzed through two aspects: static and dynamic,but cannot be explained reason of axial glide.Based on the theory of contact mechanics,by the theory of contact zone and micro slip zone in the contact of the rotary kiln,the reasons for the axial glide of the cylinder are studied,and the formula of the axial glide velocity is derived.The relationship between the gravity,the rotation speed and the inclination angle of the cylinder and the axial glide velocity is studied.An example is given to verify the accuracy of the axial glide formula.At the same time,the influence of contact angle on pressure distribution is studied,and the axial glide formula is modified.The stress condition of supporting system is analyzed by the force balance theory,and the formula for the pressure and friction of the tyre in the supporting system is deduced.According to the actual contact mode of the supporting system,the 3D model of the supporting system is established.The contact model of the supporting system is analyzed by the finite element method,and the whole tress condition of the supporting system is studied.The stress and strain of the supporting roller and the tyre are extracted,and the stress and deformation of the supporting roller and the tyre are analyzed under the action of the cosine force.Because of the unloading groove on both sides of the supporting rollers,the maximum stress change is studied by changing the size of the groove.Based on the traditional calculation method of beam theory,and the stress analysis of rotary kiln cylinder with four supports is carried out,and the distribution of stress and deformation is obtained.The cylinder model is verified and met the strength requirement.The cylinder is simulated by the finite element method,and the obtained data are compared with the data obtained by the beam theory,and the accuracy of finite element analysis is verified.Two kinds of analysis methods of beam theory and finite element method are used to analyzed the cylinder with different temperature and different wall thickness,combined with the strength requirements of the cylinder design,and the improvement of the wall thickness of the rotary kiln is studied.Through the combination of theoretical calculation and numerical analysis make the calculation results of rotary kiln are more realistic.