Study On The Screening Mechanism And Structure Of A New Double-body Linear Shaker

With the progress and development of food industry,the food product quality requirements for people are getting higher and higher.The grain inclusion rate is one of the key factors affecting product quality.Linear reciprocating vibrating screen under strong cycle load to do forced movement,often there is trouble-free running time is short,vibration and noise,vibration isolation capacity,high maintenance costs.It is very important to improve the quality of grain storage,reduce energy consumption and ensure food safety,and it is urgent to improve the efficiency of screening and improve the quality of grain storage.In this paper,the research object is basiced on TQLZ linear vibrating screen.At the same time,the mechanical dynamics and finite element method is the basis theoretical.Using the software of MATLAB and ANSYS Workbench and other numerical analysis tools analyze the new two-body linear vibrating screen equipment.In this paper,the main contents has dealt as follows:(1)Based on the TQLZ180200 linear vibrating screen,the structure and improvement of the new double-body linear vibrating screen were established,and the theoretical model was established.According to the Newton’s second law,the two-The motion differential equation of the system is calculated and the relevant kinetic parameters are calculated.What’s more,the paper calculated the relevant dynamic parameters.(2)The paper analyzed the static force of the main vibration spring and complete the structural design,and using Pro / E software draw its 3D solid model.And then the solid model was imported into ANSYS Workbench software for static analysis and modal analysis of harmonic response analysis.The maximum equivalent stress is 104.53 MPa,which is much lower than the yield limit of 520 MPa.The modal analysis can obtain the first 6 order modes of the main vibration spring,and its natural frequency is far from the working frequency of the screen.The harmonic response The maximum average stress of the spring is 323.23 MPa,which is much smaller than the yield limit of the main vibration spring material.(3)This paper finished the dynamic stiffness coefficient and damping coefficient of therubber vibration isolation spring and the stiffness coefficient of the main vibration spring.The amplitude-frequency characteristic curve of the bimodal linear vibrating screen machine is obtained,and the numerical simulation tool is used to simulate the double.The amplitude of the plastid and lower plastids in the plastric linear vibrating sieve is 5.8mm and 2.1mm,respectively,indicating that more energy is used for the classification and screening of the material.And proposed to meet the actual conditions under the premise of the main vibration spring stiffness range should be between 8×2×10~5N/m~8×3.5×10~5N/m.(4)According to the simulation results and the theoretical calculation,it is shown that the improvement of the new type of bimodal linear vibrating screen and the design of the main vibration spring meet the requirements.Compared with the traditional linear vibrating screen,the vibrating sieve can reduce the required exciting force by 10%.The basic dynamic load can be reduced by 16 ~ 61%,the material handling capacity increased by 92%..The design of screen in this paper can achieve energy conservation,reduce energy consumption,extend the service life of the screen and improve the processing capacity.The design goal of the double-structure vibrating screen is completed.(5)Through the measurement of the amplitude of the vibrating sieve of the two-body structure and the single-body structure,the design idea and simulation results of the subject are verified.