Design Of 4-DOF Vibrating Screen For Maggot Separation In Biological Treatment Of Livestock And Poultry Manure

At present,in order to meet the needs of the vigorous development of the market,the production development direction of Chinese pig industry is becoming more and more centralized and large-scale.At the same time,the large amount of livestock and poultry manure produced not only pollutes the ecological environment,moreover it would even threat people’s health.The use of livestock and poultry manure to feed maggots can not only efficiently consume a large amount of livestock and poultry manure,but also is widely used in the livestock and poultry breeding industry because of the low price of livestock and poultry manure itself.However,due to the efficient and effective separation of fly maggots and maggots,fly maggots cannot be used for livestock and poultry manure treatment.Therefore,it is very important to use a parallel vibrating screen to efficiently and effectively separate the mixture of fly maggots and livestock manure.Based on the above background,our group proposes a parallel 2T2 R four-degree-of-freedom parallel vibrating screen for the rapid and effective separation of maggots.We analysis its main body parallel mechanism,kinematic characteristics,factors affecting the screen penetration rate,and the static structure of the main structure and the modal analysis.The specific content can be summarized as follows:1.Design a variety of main body parallel mechanisms for multi-dimensional vibrating screens for maggot separation,and optimize the model.It mainly includes 3T1 R,2T2R and 3T2 R parallel mechanisms.Based on the comprehensive theory of parallel mechanism type of azimuth feature set,the topological structure of the three parallel mechanisms is analyzed and designed,and a model is selected from them for use in magenta material separation multi-dimensional vibrating screen..2.Analyze the Kinematic performance of the main parallel mechanism of4-DOF maggot material separation vibrating screen.First,through theoretical calculations,the positive and negative solutions of its position are obtained,then the speed and acceleration are analyzed.After the three-dimensional model of the main body parallel mechanism is established in solidworks2016,the three-dimensional model is imported into ADAMS,and the driving functions are added to the four driving pairs.After completing the simulation movement,the theoretical movement curve of the moving platform will be used in the follow-up test and compared with the actual movement curve.3.Based on EDEM,analyze the factors how to affecting the penetration rate of 4-DOF multi-dimensional vibrating screen.On the basis of the physical parameter of maggot feces measured in the early stage of the research group,the establishment of the three-dimensional model of maggot feces was completed in Solidworks2016,and according to the optimal results of the orthogonal analysis in the early stage of the research group,in the EDEM software,Simulate the screening process of 2T2 R multi-dimensional parallel vibrating screen,and simulate the influence of several factors on the penetration rate.4.4-DOF maggot manure separation multi-dimensional vibrating screen main structure static and modal analysis.Based on the ansys workbench software,the main structure is studied.Firstly,the static deformation is used to obtain the displacement and maximum stress of the main structure;secondly,the sixth-order modal analysis is carried out,and the maximum working frequency when the vibrating screen is working is found.The difference in the minimum value of the natural frequency in the medium meets the requirements,which proves that the resonance phenomenon will not occur when the vibrating screen is working.5.4-DOF maggot manure separation multi-dimensional vibrating screen prototype screening test.After the size synthesis of the main structure of the multi-dimensional parallel vibrating screen,the design and processing of the4-DOF maggot material separation multi-dimensional parallel vibrating screentest prototype machine is completed.After the assembly has been completed,select the appropriate hardware,write the control program and debug the prototype,and then from the EDEM simulation results in Chapter 4 of this article,select the optimal scheme for sieving experiments;perform kinematic performance tests on the multi-dimensional parallel vibrating screen,and use the mixture of simulated maggot feces and fly maggots to screen the multi-dimensional parallel vibrating screen Performance experiment.Through the ADAMS kinematics analysis,the theoretical motion curve of the vibrating screen main structure dynamic platform is obtained,based on the EDEM simulation results,the influence of six influencing factors on the screening efficiency is verified,and the best value of the simulation results is applied to the test.In the test,by comparing the measured motion curve with the simulation curve to verify;the value of the best screening influencing factors should be applied to the test to verify the correctness of the simulation results.The parameter values are used in the actual screening process.