The Research And Design Of Lotus Digging Machinefor Paddy Field

Lotus is a kind of aquatic vegetable loved by the masses, which has great medicinal and edible value, it is widely distributed in china. However, the lotus digging problem has been plagued the lotus farm and restricted the development of lotus industry. The artificial digging lotus is high labor intensity and low production efficiency. Moreover, the lotus harvest mechanization development level is low, nowadays the marketing lotus harvesting machine exists many problems, such as: bulky, high power consumption, high cost, not ideal digging effect and so on. In view of the fact that so far no matter at home or abroad the lotus root digging mechanization technology development is seriously lagging behind and the applicable equipment is blank, it has an important strategic significance for the research and development of advanced and applicable technology and equipment suited to our country. This paper carried out the research on material characteristic of lotus root, designed a lotus root digging machine which powered by boat type tractor, optimized it and carried the outfield test, the main research contents are as follows:(1) The topic studied the material properties of lotus root and explored the pressuredisplacement law of lotus root during the compression process, the result is that the size relationship of yield limit between different lotus nodes is S3>S2>S1, however the ultimate failure is B2>B3>B1. The significant level P values of yield limit to compression speed and lotus joints are 1.89′10-6<0.01 and 2.88′10-3<0.01, however significant level P to their interaction is 0.32>0.05, the result indicate that the compression speed and different lotus joints have a significant effect on lotus root yield limit, but the interaction of them had no significant effect. The significant level P values of failure limit to compression speed and lotus joints are 2.28×10-5<0.01 and 6.37×10-6<0.01, however significant level P to their interaction is 0.41>0.05, what means that the compression speed and different lotus joints have a significant effect on lotus failure limit, but the interaction of them had no significant effect. Through the bending experiment, the distribution rang of the maximum bending pressure was get, it was 150 N~250 N.(2) The overall design scheme of lotus root digging machine was put forward, it powered by boat type tractor, the structure function design and layout research of the waterpower system、the hydraulic transmission system and the mechanical excavation system were completed. With the help of Pro/E software, the model design of every component was completed, this paper used the fluid mechanics knowledge to calculate and analyze the energy loss in the pipeline, the total resistance loss was 3.44 m.(3) The static structural analysis project were established in ANSYS Workbench, and three different square hollow sizes of 40 mm、50 mm、60 mm were selected for static structural mechanics simulation load analysis to get the corresponding stress and strain. The corresponding mass、maximum equivalent stress and the maximum deformation respectively were 7.73 kg、158.42 MPa、1.28 mm,9.87 kg、96.31 MPa、0.91 mm and 7.73 kg、158.42 MPa、1.28 mm. After comparison considering, the hollow steel models of 50 mm length was finally selected as the using material for hanging frame because of the lighter mass and satisfying work intensity requirement.(4) With the help of FLUENT15.0 software, the analysis about internal flow field simulation of sprinkler water separator on lotus root digging machine was carried out, the water inlet type of two inlets and three inlets was compared through velocity and pressure distribution contour. The average of six outlets maximum speed and average speed for two inlets separator were 4.01 m/s and 3.34 m/s, the standard deviation for them are 0.11 m/s and 0.09 m/s; however the average of six outlets maximum speed and average speed for three inlets separator were 3.97 m/s and 3.59 m/s, the standard deviation for them are 0.01 m/s and 0 m/s. Combined with the velocity and pressure contour, three inlets separator was selected as the final way for water imports of pump water separator because the uniformity about outlet water velocity of three inlets is good and less energy loss.(5) Field experiment on the different depth of mud was carried out, the field work performance such as the stability while lotus roots digging machine walking in or out the field were tested. The result was that the field operation speed was 0.32 m/s, the working was 0.32 m, the lotus root digging rate was 76.5%, the injury rate was 12.6%, the pure working efficient was 151.49 m2×h-1, the swing frequency of nozzle water separator was 30 r/min.