| The lotus root has high edible and medicinal value,and is a kind of aquatic vegetables and special agricultural products favored by the people.With the adjustment of the rural industrial structure,the polarity of farmers has continued to rise,and the area of lotus roots has also increased year by year.At present,lotus roots are mainly excavated by manual single spray guns,that is,the soil covered with lotus roots is washed with a water gun,and then the lotus roots are extracted from the soil.This lotus root harvesting method improves the harvest efficiency to a certain extent,but requires proficiency for the lotus root workers.The high labor intensity,low efficiency,and poor economic benefits are not conducive to the long-term development of the lotus root industry.In response to the above problems,a screw-propelled lotus machine was designed in this paper based on the screw-propelled chassis,the structural parameters of key components were designed and calculated,and soil trough tests were conducted.The main research contents are as follows:(1)The overall scheme design of spiral propelling lotus digger and the design of key components were carried out.The spiral propelling chassis was adopted as the walking device,cooperating with the jet system and the transmission system to dig and harvest the lotus root.The key components of the excavator were designed and calculated,including the structural parameters of the screw propulsion chassis,the structural parameters of the jet device,etc.The diesel engine and water pump was selected,and transmission system was designed and selected.The kinematic analysis of the spiral drum was carried out.(2)The energy loss of the jet system of the screw propeller lotus machine was analyzed by basic principles of fluid mechanics,and the status of the pipeline water flow was conducted.The energy loss model of the jet system of the screw propeller lotus digging machine was established,and the energy loss along the pipeline,the local energy loss and the energy loss of the nozzle were calculated in turn,and the actual head of the lotus machine was 18.37 m.(3)Static simulation analysis of three different thickness frame of 1.2mm,1.5mm and 2mm was carried out by ANSYS Workbench,and corresponding equivalent stress contour diagram and total displacement contour diagram were obtained.Under the premise of meeting the working strength requirements,and in order to reduce the weight of the frame and the whole machine as much as possible,the 1.2mm thick stainless steel square tube was selected as the frame welding material.A modal analysis of the frame was carried out to obtain the first six-order total deformation contour map,and the location of the maximum deformation and its own frequency could be obtained;the frame excitation frequency was calculated and checked,and the inherent first six-order frequency of the component was less than the external excitation frequency.The resonance situation basically does not occur.(4)Soil trough test of the screw-propelled lotus digger was conducted,and its field performance analyzed and studied;The soil trough test was conducted with the digging depth,the lotus root buoyancy rate and the lotus root breakage rate as the test indicators,and the walking speed,spray angle and the distance between the nozzle and the mud surface as the test factors.Soil trough tests showed that when the travel speed was 0.1m/s,the spray angle is 60 °,and the distance between the nozzle and the mud surface is 0,the digging depth reached 376 mm,the floating rate of the lotus root was 94%,the damage rate was 3.3%,and the experimental effort was better. |
PDF Full Text Request