| At present,the planting of seedling trays and the covering of subsoil are mainly done manually in rice sheds,which has some problems such as low production efficiency,long operation time and large manual input.In view of the above problems,this paper,through structural design,theoretical analysis,dynamic simulation analysis,statics simulation analysis and other methods,carried out the design and experimental research on the overlaying machine and its key components.The main research contents are as follows:1.Taking the soft plastic rice tray as the research object,an electric drive type single row rice seedling tray tilting and overlaying machine was designed and analyzed.The main parameters of the tilting and overlaying machine were designed and analyzed to determine the value range of the main parameters such as the volume of the soil box,the Angle of the box wall and the Angle of the rice tray conveyor belt.The three-dimensional model of the whole machine was constructed by using Solidworks.The assembly and motion interference test of parts are also carried out.2.The static analysis module of ANSYS software is used to conduct mechanical simulation analysis of the transverse track and the soil cover box,and the maximum stress value and the maximum strain value are obtained.Co MPared with the allowable stress value calculated by the formula,the maximum stress value is less than the allowable stress value of the material,indicating that the material selection of the transverse track and the soil cover box is reasonable,and the device can operate safely and stably.3.Taking rice seedling soil as the research object,parameters such as density,natural Angle of rerest and soil texture were obtained by measuring soil material properties.The soil particle model was generated by EDEM software,and the soil covering process of the soil covering device was simulated and analyzed.The instantaneous flow diagram of the convex dot soil covering belt and the soil crushing roll in the soil box were obtained.4.With the height off the ground of the device,forward speed and the dip Angle of the yangt-plate conveyor belt as test factors,and the variation coefficient of soil stability and the deviation of the yangt-plate position as test response indicators,the single factor experimental study was carried out to determine the optimal range of each factor.The height of the device is20-40 mm from the ground,the forward speed is 0.05-0.15m/s,and the dip Angle of the rice plate conveyor belt is 26-34°.Based on this,a three-factor and five-level orthogonal rotation combination test was designed to study the influence of the interaction between test factors on the response index,and determine the primary and secondary relationship of the influence of each test factor on the response index.Using Design-Expert software,the optimal combination of operation parameters was obtained as follows: ground height 25 mm,forward speed 0.1m/s,conveyor belt dip Angle of rice plate 30°.In this case,the deviation of rice plate position was2.85 mm,and the variation coefficient of soil covering stability was 7.12%,which met the agricultural requirements of the dish setting and soil covering process. |
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