Design And Experimental Research On Peanut Dibbling Machine

Our country is one of the great powers of growing peanuts,Peanuts are not only helpful to solve the problem of edible oil in China,but also have high medical value.So the peanut growing is all over the country.With the improvement of national mechanization level,all kinds of peanut planters have been appeared.Due to the plastic film mulching is helpful to the growth of the seeds.our country appears peanut membrane machine after referring to the foreign advanced sowing technology.The main working part of seeding machine is membrane dibbler.It is good to improve the previous sowing methods,and promote the increase of the yield of peanuts by the direct drilling on the covered film.However,there are still some problems in the actual operation process,such as tearing the film,the low qualified rate of grain number in the hole and film damage and so on.The emergence of these problems affects the yield and quality of peanut seed seriously.A new scheme needs to be proposed to solve the existing problems of dibbler urgently.Based on the careful study and analysis of the domestic and foreign peanut sowing machine status,the common problems of the plate opening dibbler have been found.The relevant parameters of the dibbler have been redesigned and studied after analyzing the possible factors.Which makes the new mechanism design can be not subject to the hill-drop planter,but solve the existing problem of the plate opening dibbler.The research provides effective theoretical support for the development of peanut machinery.And the main research contents are as follows:(1)After studying the existing opening theory of the hill-drop planter,a new institution of peanuts dibbling is designed and analyzed after combining the agronomic requirements of peanut seeds with relevant motion geometric relationships.The relevant institutions on the dibbling machine parameters are determined,which include dibbling wheel radius and width,number of duck mouth,coincidence degree of the hill-drop planter and structure size of the duck mouth and fixed duck mouth.(2)The model is built out with the Solid works 3D CAD software after simplifying the new metering device.Assembly and interference inspection have been done according to the relationship among the components which are ensure the late simulation can be obtained at normal.The model is put into ADAMS software,and be simulated the movements of the normal operation under the condition of the presence of different slip ratio and the different speeds.The simulation data have come out which include the degree of the opening of the duckbill and the trajectory of the hole.The results show that the duckbill opening can meet the requirements of the design.And the relationship can be found between the hole and the slip rate and the speed of the mechanism operation from the data results.(3)As the collision exists between the limited block and the driving lever of the designed forced opening mechanism,and the collision is frequent,the transient dynamic analysis is carried out on the limited block and the driving lever to get cloud charts of stress and strain.Based on the analysis of the cloud charts,the stress condition of the limited block and the driving lever is observed.The design of the mechanism can meet the strength requirements by comparing the value of the stress and the yield strength value of the two materials,and it has certain rationality,which provides the basis for further optimization.(4)Because the complexity of soil conditions cannot be predicted in the simulation,only method is to study the dibbler model by the field test.In order to verify the performance of the design mechanism,a prototype is made.To observe the test results,the contrast test comes,which is between the original plate opening dibbler and the forced open dibbler.They are both driven by the same tractor with three hanging.Most of the factors of the influence of the slip ratio depend on the nature of the soil.Therefore,in this experiment,three different types of soil and different speed of operation conditions are designed.Experimental result data display that the effect of the original platen dibbling machine in loam is good,and the qualified rate of points can reach more than 88%,but the operation effect is poorer in the sand.The number of qualified rate of the new forced opening mechanism is above 90%and its value has littler difference in three kinds of soil under the same operating speed.Test results show that the opening of the pressure plate is easy to be restricted by soil condition but the new type of forced open type is suitable for all kinds of soil,and it can achieve better seeding effect.It has certain practical value of mechanism design.(5)By analyzing the mechanical damage degree of the test results,it is found that the new mechanism will not damage the plastic film when the sowing depth is shallow.Through the experiment,it is found that the damage is caused by the pressing plate squeezing the soil.The new mechanism will not appear the phenomenon without the pressing plate.Therefore,it has a certain effect to alleviate the problem of breakage of the plastic film.Because of the national agricultural standard does not have a clear definition on the concept of tearing the film,which is standardized and quantified in this paper.Due to gravity,the dibbler subsides in the soft soil,and result in deep sowing.In this event,root of the driving lever of the new mechanism which is connected with the duckbill crushes the plastic film occasionally.Thus it is also need to further optimize the design of the new mechanism in later period.