| Tobacco is an important cash crop in China.During the whole planting process of tobacco,it is necessary to cultivate soil many times to improve the yield and quality of tobacco.For a long time,because there is no special tobacco cultivation machine,tobacco cultivation mostly depends on manual operation or other crop cultivation machine.The effect of soil cultivation is poor and the cost is high.It is of great significance to develop special tobacco hilling machine.The transmission device is the key part of the tobacco hilling machine,and its performance will directly affect the operation effect of the cultivator.In this paper,according to the agronomic requirements of tobacco soil cultivation and the principle of double-row tobacco hilling machine,a large number of literatures were consulted,and the transmission system was designed,and the performance of the system was simulated and analyzed and field tests were carried out.Specific research contents and conclusions are as follows:(1)According to the working principle of tobacco double-row tobacco hilling machine,the force and motion analysis of soil particles on the spiral soil knife were carried out.According to the theoretical calculation,the minimum and maximum rotational speeds of the spiral soil knife were 143.97rpm and 412.16rpm respectively.According to the requirement of quantity of soil and power saving,the rotational speed of spiral soil knife was designed to be 200?300 rpm.The prototype of spiral soil-raising knife was made.Field measurements showed that the load of spiral soil knife was about ION·m at no load and no more than 40N m at full load.(2)Comparing various hydraulic transmission system schemes,it was determined that the hydraulic transmission mechanism of tobacco double-row hilling machine adopts two hydraulic motors in series and parallel synchronization scheme.According to the calculated and measured speed and load data of the hydraulic motor,the hydraulic transmission system of the tobacco double-row hilling machine was designed,and the selection of components of the hydraulic system was completed.According to the overall arrangement of the tobacco double-row hilling machine,a hydraulic oil tank was designed.In order to ensure that the speed of the hydraulic pump can match the speed of the rear power output shaft of the mounted tractor,a two-stage gear speed-increasing box was designed.(3)Using AMESim software,the hydraulic transmission system of tobacco double-row hilling machine was modeled and analyzed.According to the actual situation of soil cultivation,two load models were designed to simulate the steady load and abrupt load during normal soil cultivation,and the pressure of hydraulic system and the speed of hydraulic motor under normal load and abrupt load were simulated respectively.The simulation results were basically consistent with the design data,and the hydraulic transmission system has a certain self-regulation ability,which can meet the operation requirements of the tobacco double-row hilling machine.(4)The parameters of the prototype were adjusted and field experiments were carried out.The rotational speed of the spiral soil knife,the pressure of the hydraulic transmission system and the temperature of the hydraulic oil tank were measured.and the rationality of the design of the hydraulic transmission system was verified.The hydraulic transmission system can ensure that the soil-cultivating device can complete the tobacco cultivation and soil-cultivation operation.The transmission device can ensure that the soil-cultivating machine can better realize the function of cultivating soil in tobacco.Field experiments provided a theoretical basis for subsequent optimization design. |
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