Design And Experiment Of Upright Planting Device For Rice Pot Seedlings

The rice pot seedling transplanters currently on the market can achieve the transplanting function,but the pot seedlings have a large difference in the uprightness after transplanting,and the pot seedlings are on the surface of the mud,which is prone to lodging,floating and being affected by bad weather.Ensure that the seedling population grows evenly and the yield is reduced.In response to the above problems,a vertical planting device for rice bowl seedlings was designed to simulate the actual operation process of the transplanter,starting from the aspects of seedling age,advance speed,drop height,seedling height and potting frequency,and combining agricultural machinery and agronomy to carry out rice bowl seedling transplantation.The experimental research on the planting quality after planting ensures the good growth condition of the seedlings in the later stage;based on the previous test results,a combination mechanism for ditches and mud was proposed to conduct performance tests to improve the uprightness of the rice pot seedlings after transplanting,and realize the transplantation.The pot body is placed under the mud surface after planting,thereby improving the planting quality of the pot seedlings after transplanting.The main research contents and conclusions are as follows:1)Design of key components for planting quality and determination of parametersAccording to the movement state of the pot seedlings in the guide mechanism,it can be divided into four stages;establish the kinematic analysis model of the pot seedlings;and carry out the theoretical analysis of the landing morphology of the rice pot seedlings according to the erection requirements of the pot seedlings after transplanting.In order to ensure that the pot seedlings falling vertically on the seedling conveying tube II can seedlings on the top and the bottom of the pot,the taper of the inclined side wall of the seedling tube is determined by analysis:α>θ₀≈25°;according to the erection standard of the machinery industry,the distance between the mouth of the tube and the mud surface is obtained.Height h₄>219.1mm.According to the rice planting row spacing,planting depth,and the function requirements of sludge retention,an innovative design of the ditching and sludge combination device,and theoretical analysis of the sludge device,the establishment of a theoretical sludge volume and ditch filling model,and the determination of the sludge claw of the sludge device The length of the turning center point O1 from the mud surface is l=69.4mm,the length of the second link c=67.85mm,and the swing radius of the choking claw d=38.03mm.2)The impact test on the planting quality of rice pot seedlingsIn the preliminary experiment of transplanting rice pot seedlings,the pot seedling’s uprightness was used as the test index,and the age of seedling,moving speed and falling height were used as the experimental factors.Single factor experiment and orthogonal experiment were carried out.The results showed that in the single factor test,the order of the influence of each factor on the erection of the pot seedlings after transplanting was age of seedling,moving speed,and falling height;in the orthogonal test,when age of seedling was 24d,the moving speed was 0.35m/s,and falling height was 680mm,the pot seedlings will have better uprightness after being transplanted by the rice pot seedling transplanter.In the transplanting erection test of rice bowl seedlings,the erection of the bowl seedlings and the distance between plants are used as the test indicators,and the forward speed,the taper of the oblique side wall of the seedling tube,the height of the tube mouth from the mud surface,the height of the seedling,the frequency of potting,and the distance between the upper and lower tube,The width of the cylinder mouth and the length of the straight cylinder are used as the test factors,and the single factor test and the two orthogonal rotation combined test are carried out.The results show that the influence of each test factor on the erection of the pot seedlings after transplanting is in the order of the taper of the side wall of the tube,the height of the tube mouth from the mud surface,the advancing speed,the height of the seedling,and the frequency of the pot;the order of the influence on the pitch of the pot seedlings is Advance speed,pitching frequency,seedling height,height from the mouth of the bowl to the mud surface,taper of the side wall of the seedling tube;the order of influence of the interaction factors on the erection of the pot seedlings is X₂X_4,X₂X₃,X₃X₅,X₄X₅,X₁X₄,and the order of influence on the plant spacing is X₂X₅,X₂X₄.When the forward speed is 0.197m/s,the taper of the oblique side wall of the seedling tube is 53°,the height of the tube mouth from the mud surface is 281mm,the seedling height is160mm,and the pitching frequency is 81 times/min.In the multi-factor supplementary experiment,the influence of each test factor on the erection of the pot seedlings after transplanting is the distance between the upper and lower seedling tubes and the width of the mouth;when the distance between the upper and lower seedling tubes is 132mm and the width of the mouth is 25mm,after transplanting The pot seedlings have a higher uprightness.In the experiment of the offset center value of the pot body for transplanting rice seedlings,the offset center of the pot body is used as the test index,and the distance between the upper and lower seedling tube,the length of the straight tube,the height of the tube mouth from the mud surface and the width of the tube mouth are used as the test factors,and the single factor test is performed Combination test with two orthogonal rotations.The results show that the influence of each test factor on the test index is the width of the cylinder mouth,the height of the cylinder mouth from the mud surface,and the length of the straight cylinder;the influence of the interaction factor on the offset center value of the bowl is X₂X₃,X₁X₃,X₁X₂.The results of the optimized experiment concluded that when the width of the mouth of the tube is 26mm,the height of the mouth from the mud surface is 281mm,and the length of the straight tube is 50mm,the pot seedlings can all fall into the groove after transplanting.3)Performance test of ditching and sludge combined deviceBased on the test results of the transplanted rice pot seedlings’erection,plant spacing,and pot body offset center value,the performance test of the combined device for trenching and silting was carried out.Considering the qualification rate of stagnant mud first,and the higher the erection of pot seedlings,the better.Comprehensive test results are selected to select soil moisture content of 55%,closed distance of stagnant mud claws at 35mm and depth of stagnant mud at 25mm.The effect of the standing degree of the potted seedlings and the qualified rate of the blocked mud is the depth of the blocked mud,the soil moisture content,and the closed distance of the blocked mud claws in order.