Design And Performance Test Of Mountain Chestnut Picker

In recent years,with the adjustment of agricultural industry structure and the support of national economic policy for forest fruit,chestnut industry has become the dominant industry and agricultural pillar industry in some areas.At present,most areas of chestnut harvesting still rely on manual picking.Not only is the labor intensity high,but also the shortage of labor resources at harvest time will increase the labor cost.The sharp spines on the chestnut bud are easy to hurt fingers.Some existing equipment,most still need to hand-held to pick up,not only mechanization,low automation,and low efficiency of picking up,seriously limited the rapid development of Chinese chestnut industry.In view of the current problems of chestnut harvesting,a collection of picking,transportation,collection as one of the mountain chestnut picking machine is designed to realize the automation and mechanization of chestnut picking operation,so as to improve the efficiency of picking,increase farmers’ income,reduce labor intensity,and reduce planting costs,promote the rapid development of chestnut harvesting machinery.The main research contents are as follows:(1)Each device of chestnut picker was designed and the key parameters were determined.It is concluded that the speed of the brush roller should be controlled at50r/min,and the nylon brush with elastic modulus of 1.4 GPa is selected as the brush,with diameter of 1 mm and length of 115 mm.Floating shovel teeth each fork spacing of 15 mm,thickness of 3mm,material for 45 steel,pick up grid material selection of304 stainless steel spring steel wire,single pick up grid diameter of 2mm,arc length of 450 mm,arc spacing of 330 mm,pick up grid number of about 43,pick up the two ends of 330 mm apart,The spacing between each two pick bars is 10 mm.Through calculation,the driving force required in the process of the self-walking device is108.104 W,the driving motor with the power of 150 W is selected.(2)The motion process of chestnut bud was analyzed by force,and the key components were simulated.Through the force analysis of the four key positions A,B,C and D in the process of moving,the combined torques required by the movement of the chestnut bud at several key positions was obtained.The static simulation results show that the maximum stress of the picking grid is 36.514 MPa,far less than the yield limit of stainless steel 586 MPa,which meets the design requirements.The use of Solid Works software to pick up the grid through the area of comparison,join the pendulum rod mechanism after picking up the grid through the area increased by about 1.63 times.Using ADAMS software to pick up grid simulation,after adding the swing bar mechanism,the pick up distance increased 30 mm.With the increase of the rotating speed of the swing rod,the picking area will increase.The test shows that the picking efficiency of chestnut is the highest when the rotating speed of the swing rod is 120r/min.(3)The orthogonal experiment was designed,and the regression model of each response index was obtained.Through the analysis of the test results,the primary and secondary relationships between the effects of brush roll speed,forward speed and pendulum speed on the harvest efficiency and the pick rate were obtained,as well as the effects of their interaction on the harvest efficiency and the pick rate.Finally,using the Optimization function provided by Design-Expert software,the optimal solution was obtained as follows: brush roller speed of chestnut bracts 50r/min,forward speed of 0.4m/s,pendulum speed of 120r/min.