Research And Design Of High Moisture Corn Threshing Plant

Corn is a high-yielding grain crop in China.Up to now,the planting area of corn has become the second largest crop in China.In many areas,corn is dried and evaporated before threshing,which can properly reduce the degree of crushing of corn and prevent the corn from perishing after drying.At present,most corn threshing USES mechanical threshing,which not only reduces labor but also increases threshing efficiency.Therefore,it is an urgent problem to improve the performance of corn threshing machine.In this paper,the threshing drum device of high-moisture corn was studied.The harvest and storage of high-moisture corn(also known as wet storage corn)provided a new choice for replacing part of concentrate in livestock diet.High-moisture corn refers to the corn with high water content,the water content of normal corn is 14%~16%,and the water content of high-moisture corn can reach more than 30%.This paper analyzes and summarizes the research results and status quo of domestic and foreign corn threshing device,studies and designs corn threshing device,analyzes and optimizes corn threshing components,and makes effective simulation analysis of each part of the threshing device by means of simulation analysis.The main contents and conclusions of the research are as follows:(1)carry out three-dimensional modeling of the whole device of corn threshing device,study and analyze the size of each part,analyze and compare corn threshing components,select the optimal combination and arrangement,and ensure that the corn will have a small crushing rate on the corn seeds during the corn harvest and remove the corn cob at the same time.(2)the use of ADAMS software to corn threshing device in the process of threshing corn with force diagram is generated between the parts,and analysis: wen lever block and nail tooth spiral arrangement scheme for the in conformity with the principle of threshing and threshing demand,hit the majority of the force between corn in between critical force of 640 n and 1820 n,ensures that the corn threshing device to take off the net rate and broken rate,save the analysis process,for the implementation of the next step to lay the foundation.(3)ANSYS finite element analysis was used to analyze the corn threshing device in two aspects:1)use of grain lever blocks and spike-tooth Static Structural statics analysis module,the grain lever block and nail tooth in corn threshing cylinder work under stress in the process of simulation,analysis of threshing device in threshing cylinder from two aspects,the action of forces exerting a force in the module,analysis showed that threshing device is one of the biggest stress value,compared to select the physical parameters of material,material selection is reasonable,can meet the demand of threshing2)of the corn threshing roller Modal module calculation and verification,part of the statics analysis on material choice is correct,so the Q235 is added in the module-A material,physical properties,the simulation to choose 6 order natural frequency,Modal simulation analysis of corn threshing device outside power supply machine vibration frequency of 8.3 ~ 10 Hz,corn threshing cylinder minimum frequency for the first order Modal frequency of 10.304 Hz,the simulation results show that the machine resonance will not occur at runtime.Bench test can be carried out.(4)chapter iv orthogonal test design and bench test1)bench test is one of the important methods of agricultural machinery science experiment,corn threshing device in the laboratory simulation of the real environment to test,through literature review and analysis,determine three kinds of factors affecting threshing effect,respectively,concave plate gap,drum speed,feeding.Two indexes were determined to determine the results of the influencing factors,namely,the grain breaking rate and the grain removing rate.In order to save experimental steps,the repeated and invalid tests were omitted,and 23 groups of effective data were used for experimental verification,and the values of 23 groups of crushing rate and removal rate were obtained through the test.2)tidy up the experiment concluded that the numerical analysis of the orthogonal experiment Design,through the Design-Expert8.0.6 software test Design,the three factors five levels quadratic regression orthogonal rotary center combination,testing scheme Design,through the chart analysis to three factors are influential to two test index,and then respectively effects on performance index of single factor analysis:speed and feed rate constant,concave plate clearance changes,concave plate clearance on the influence of grain crushing rate is not very significant,not to take off the net rate with the increase of concave plate gap increased;The clearance and feeding amount were constant,the faster the roller speed was,the higher the grain crushing rate was,and the higher the uncleaned rate was.The clearance and rotation speed of concave plate were constant,the feeding amount increased,the crushing rate increased,and the removal rate first increased and then decreased.3)the influence of multi-factor interaction on the performance index: according to the optimization results,the concave plate clearance is 78 mm,the drum speed is324.8r/min,when the corn feeding amount is 4kg/s,the grain damage rate is 2.62%,and the corn unstripped rate is 0.65%.