Design And Test Of Vibrating Jujube Harvester

Xinjiang’s red jujube planting area and output are in the leading position in the country,of which Xinjiang’s red jujube production accounts for 50% of the country’s total output.Especially in southern Xinjiang,jujube is one of the main cash crop and one of the main forest fruit trees for agricultural industrial restructuring.However,the development and application of forestry and fruit machinery in China started relatively late.In the southern Xinjiang region,jujube harvesting is still mainly manual harvesting,with a relatively low degree of mechanization.However,the harvesting period of jujube coincides with that of other crops,resulting in problems such as difficulty,high cost,high labor intensity,and inability to harvest in a timely manner.In response to the above issues,this article designs a vibration type jujube harvester with simple structure,easy operation,and high work efficiency based on the growth characteristics and planting characteristics of dwarfed and densely planted jujube trees.The prototype is then subjected to on-site harvesting experiments in dwarfed and densely planted jujube orchards.The main research content is as follows:1.Using the method of model simplification,a jujube vibration model,a jujube tree harvester system dynamics model,and a jujube fruit vibration dynamics model were established.Expressions for the displacement,velocity,acceleration,amplitude,and fruit inertia force of the jujube tree trunk under vibration were derived,and the periodic variation relationship of displacement,velocity,and acceleration of the vibration system was obtained;During the single eccentric vibration process of a jujube tree,the trunk of the jujube tree undergoes torsional motion,and the movement trajectory of the jujube tree is in the shape of an inverted cone;The vibration trajectory of the jujube tree harvester vibration system is a circle with a radius of;The main factors affecting the completion of fruit shedding include vibration frequency and amplitude.The higher the frequency or amplitude,the greater the amplitude of inertia force,and the better the vibration effect.2.The overall structural design of the vibrating jujube harvester was carried out,and the main components such as the excitation components,clamping mechanism,and harvester walking trolley were designed and analyzed.The mass moment of the eccentric block designed for the excitation components was 0.64 kg ? m,the radius of the eccentric block was 55 mm,and the power of the motor supporting the excitation components was 650 W;A clamping mechanism for a jujube harvester was designed using a semi circular clamping head design.The clamping force of the clamping mechanism was designed to be 858 N,with a clamping diameter of 80～100mm and a total arm length of 1.6m.Solid Works Simulation was used to analyze the static stress of the clamping device,and various components of the clamping device were optimized based on the results of the static stress analysis,enhancing the stability of the clamping mechanism;We have designed a walking car for the harvester,and the control mechanism for the car is controlled by one controller and two switches,respectively,to drive and excite the car.3.A study was conducted on the prototype of a vibration type jujube harvester for dwarfing and dense planting jujube orchard harvesting.The experimental results showed that the vibration combination parameters of the vibration type jujube harvester were motor speed 1140r/min,clamping height 350 mm,and eccentric block mass 650 g.The harvesting method can achieve higher harvesting efficiency and less damage to the jujube tree skin.The harvesting efficiency of the vibration type jujube harvester is about 90% or more.