Experiment On Influence Of Conveying Performance Of Steel-roll On Rice Straw In Steel-roll Baling Mechanism

Annual output of rice straw in China exceeds 200 million tons.As an important renewable biomass resource,it has been widely used in feed,energy,industrial raw materials,edible fungus base materials,fertilizer and other fields.However,the distribution of rice straw resources is scattered,and rice straw has loose structure and bulky volume,so storage and transportation of rice straw is more difficult.In recent years,small and medium steel-roll baler is mainly used to carry out field bundling in our country.Steel-roll baler is widely used because of its simple struction and low price,but it has low productivity and easily emerges problems of block in the process of blocking.Therefore,in this paper the relevant test device is designed to carry out the experiment research on the conveying performance of steel-roll on rice straw in the steel-roll baling mechanism,which is necessary to promote innovation and development of the steel-roll round baler.The main research contents and results of this paper are as follows:?1?A test device for the sliding friction coefficient between the steel-roll and rice straw was established in this paper.The device mainly consists of the frame,motor,coupling,torque sensor,connectors,buffer springs,pressure sensors,pressure plate,material boxes,steel-rolls and other components.The test device for the sliding friction coefficient was built by CATIA V5 and processed.?2?Experiment research on sliding friction characteristics between rice straw and steel-roll was carried out.The effect of the moisture content of rice straw,the positive compressive stress,the steel-roll linear speed on sliding friction coefficient was studied by L₂₇(3¹³)orthogonal test and single factor experiments respectively.Then the effect of interaction on sliding friction coefficient was studied by double factors test.Results of orthogonal test show that the sliding friction coefficient between rice straw and steel-roll is significantly affected by the moisture content of rice straw and positive compressive stress,and is affected less significantly by the steel-roll linear speed.The order of the influencing factors is moisture content of rice straw>positive compressive stress>steel-roll linear speed,and the interaction between the moisture content of rice straw and the positive compressive stress has a significant effect on the sliding friction coefficient between rice straw and steel-roll.Results of single factor tests show that the sliding friction coefficient of rice straw and steel-roll increases with the increasing of the moisture content of rice straw,decreases with the increasing of the positive compressive stress and decreases with the increasing of steel-roll linear speed.When the moisture content of rice straw is 10%⁷0%,the compressive stress is 1⁹ kPa and the steel-roll linear speed is 0.2⁰.8 m/s,the sliding friction coefficient between rice straw and steel-roll varies from 0.353 to 0.612.Results of double factors test show that the sliding friction coefficient between rice straw and steel-roll increases with increasing of moisture content of rice straw and positive compressive stress.?3?The conveying performance test bench of steel-roll on rice straw in steel-roll baling mechanism was established.The device is mainly composed of the frame,steel-roll,side walls,driving system of chains,conveying device and motors.The test device for the conveying performance of steel-roll on rice straw was built by CATIA V5 and processed.?4?The experiment research on the conveying performance of steel-roll on rice straw in the steel-roll baling mechanism was carried out.In this paper,the diameter of baling chamber,the feeding speed of rice straw,the rotating speed of steel-roll and the surface type of steel-roll are chosen as experiment factors.Height and time of conveying are chosen as experiment indicators.The L₁₆?4³×2⁶?hybrid orthogonal experiment and single factor experiments were carried out in turn.The results of the hybrid orthogonal experiment show that the conveying height of steel-roll on rice straw is greatly affected by the feeding speed of rice straw,is significantly influenced by the rotating speed of steel-roll,and is less influenced by the diameter of baling chamber and the surface type of steel-roll.The order of influencing factors is:feeding speed of rice straw>rotating speed of steel-roll>diameter of baling chamber>surface type of steel-roll.The results of the hybrid orthogonal experiment show that the conveying time of steel-roll on rice straw is greatly affected by the feeding speed of rice straw,is less influenced by the diameter of baling chamber and the rotating speed of steel-roll,and is few influenced by the surface type of steel-roll.The order of influencing factors is:feeding speed of rice straw>rotating speed of steel-roll>diameter of baling chamber>surface type of steel-roll.The results of single factor tests show that both the conveying height and the conveying time of steel-roll on rice straw increase with increasing of the diameter of baling chamber,and first decrease and then increase with increasing of the feeding speed of rice straw.Then the conveying height of steel-roll on rice straw increases with increasing of the feeding speed of rice straw,but the conveying time of steel-roll on rice straw decreases with increasing of the feeding speed of rice straw.Comprehensive analysis,when diameter of baling chamber is more than 600 mm,is 0.8¹.6 kg/s,rotating speeding of steel-roll is 220²50 r/min and surface type of steel-roll is mixed surface steel-roll with rib and bar,the rolling efficiency of steel-roll baler is better and there is no accumulation and blockage of rice straw.