| Two-mass vibratory feeder is a kind of inertial feeder,which is a necessary part in the steps of feeding,batching and quantitative packaging in coal mine,agriculture,chemical industry,building materials,electric power and other industries,and is an important equipment to realize the effective control of feeding system and the automatic development of production process.At present,the design of the new feeder in this thesis mostly adopts the method of experience and safety factor.For different models in the same series,the parameters are only adjusted by empirical formula,and the dynamic characteristics of the structure and the rationality of important structures are not fully considered,so it is easy to have problems such as short fatigue life,low output,large power consumption and unstable amplitude.In this thesis,aiming at the above problems existing in the current two-mass vibratory feeder,modern design methods such as virtual design,dynamic simulation,finite element analysis and fatigue analysis are used to study,mainly including theoretical analysis and simulation analysis of the dynamic characteristics of the two-mass vibratory feeder;Modal analysis and harmonic response analysis of feeder;The fatigue analysis of the whole machine and the fatigue analysis of the rubber shear spring as the main vibration spring are as follows:According to the theory of mechanical dynamics,the mechanical model of XZG two-mass vibration feeder was established.The mathematical model of the feeder was obtained by using D ’Alembert method to establish the kinematic differential equation.The stiffness and damping values of the main vibration spring and the vibration isolation spring,the natural frequency of the system,and the dynamic parameters such as the exciting force and the exciting frequency were obtained.Then select the motor,design the size parameters of the rubber shear spring.ADAMS software is used to simulate the dynamic dynamics of XZG type double body vibration feeding,verify the correctness of the simulation model,judge the stiffness and damping values of the main vibration spring and vibration isolation spring in the theoretical calculation,as well as the rationality of dynamic parameters such as vibration force and vibration frequency,and obtain the amplitude,track,velocity and acceleration diagram of the key measuring points on the channel.Observe whether the start and shutdown stage of the feeder is stable,and whether it can work stably.By using the finite element analysis software ANSYS Workbench,the modal analysis and harmonious response analysis of XZG type double body vibration feeder were carried out.The 14 order natural frequencies and corresponding vibration modes of the front feeder were obtained by modal analysis,and the resonance failure was judged by comparing the results calculated by dynamic theory.The harmonic response analysis shows that the maximum deformation of the feeder occurs at the working frequency of 16 Hz,and the maximum stress of the feeder is compared with the allowable stress of the material Q235 according to the first strength theory to determine whether the feeder structure meets the strength requirements.ANSYS workbench software and n Code Design Life software were used to co-simulate the fatigue analysis of the feeder and its key component(rubber shear spring),and the weak links of the structure were obtained by corresponding maximum stress nephogram and total deformation nephogram,which provided references for component selection and process production.The estimated fatigue life of the whole machine and the rubber shear spring is obtained to determine whether the fatigue strength can meet the use requirements.Through response surface analysis,the stiffness of the vibration isolation spring and the main vibration spring(rubber shear spring)at the front crane and the support was optimized to improve the deformation and stress of the feeder and improve the fatigue life of the feeder.This thesis has 79 pictures,14 tables and 116 references. |
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