Licorice Harvester Design And Mechanism Analysis Of Key Mechanisms

Licorice also known as Guo Lao and Tian gen zi,is a perennial herb that mainly uses rhizomes as medicine.As its Medicinal detente,it can not only increase drug property but also decrease drug property,It can be used in combination with many drugs and has high medicinal value.At the same time,Licorice is also an important plant for preventing soil erosion,soil improvement and wind break and sand fixation in desert and semiarid areas.Because of its difficulty in harvesting,there are many problems such as few special harvesting machines,insufficient depth of excavation,incomplete separation of stem and soil,large energy consumption and low degree of automation,It takes a lot of manpower to harvest.Therefore,the study of a new type of energy-efficient licorice harvester is of great value for improving the overall level of mechanization of licorice production and the development of licorice industry.(1)Firstly,the paper analyzes the planting pattern and harvesting requirements of Glycyrrhiza uralensis.The design scheme of the whole machine was determined by studying the methods of excavation,the way of removing soil and the collection method of the existing harvesting tools.Licorice harvester designed mainly includes racks,excavation devices,stem and soil separation devices,conveyor collection devices,transmission systems,hydraulic systems it can be a one-time completion of licorice excavation,stem and soil separation,collection function.(2)The paper analyzes the key parts of the machine,the separation device of the stem and soil and the conveying and collecting device,calculates and determines its main parameters,and completes the corresponding three-dimensional solid design with SolidWorks three-dimensional software.(3)The finite element analysis was performed on the frame and the excavation shovel.The finite element model of the licorice harvester frame and excavating shovel was established in the ANSYS software.The static analysis was performed and the rack and excavation shovel were obtained under the typical working conditions.The stress distribution and displacement distribution verify the rationality of the structural design.(4)In Adams Software,the model of vibrating type of stem-soil separation device is established and its kinematics simulation is analyzed.After selecting the end point and center of mass of the vibrating screen,the variation curves of the displacement and the velocity of the various points are obtained,and the variation rule of each curve is analyzed.The results showed that the parameters of each component meet the requirements of the work and provide a theoretical basis for the future optimization design work.(5)A single factor test was conducted by using a self-made Licorice harvester to investigate the influence of crank speed,vibrating screen The effects of crank speed,vibrating screen gap and The tilt Angle of the vibrating screen on the net yield of licorice harvester and the damage rate of licorice.Based on the single factor experiment,Arranging experiments through response surface methodology,the optimal process parameters are The crank speed is 294.05r/min,the shaker tilt angle is 24.14°,and the shaker gap is 110 mm,the corresponding index value is as follows: The optimal value of the net collection rate of the licorice harvester is 94.7%,and the optimal value of the licorice injury rate is 1.4%.