Analysis of Threshing Process in threshing Part of Head Feeding Type Combine

threshinc。头给料式联合收割机的脱粒作业部分，由稻穗与脱粒器、齿、凹面摩擦等条件的拉挤作用组成。本文的研究对象是利用脱粒机的齿来清除脱粒作业。实验装置测量。利用商品型头喂联合收割机的部分零件，研制了脱粒齿的脱粒力。从以往的实验中得知，脱粒作业是根据脱粒齿的固定条件（倾角、导距C3角、固定角、固定节距、旋转节距）而变化的，因此本实验在脱粒鼓上设置了一个测量脱粒力的脱粒齿。脱粒齿独立于脱粒鼓，但与脱粒鼓的旋转半径和速度相同。本研究的参数为设置节距、旋转节距、脱粒齿的超前角。测量点为测量脱粒力的脱粒齿的弯曲、力矩和扭转力矩，以及脱粒鼓的驱动力矩和转速。试验采用一捆重约1kgf的水稻（品种KINMAZE），由6 8丘水稻采集而成。稻穗的测量项为实验装置通过前后的总重和脱粒筒凹位和后位脱粒和落粒的穗重，并以此计算脱粒率和累计脱粒率。从实验结果中发现了以下几点：1)测量脱粒力的脱粒齿在脱粒鼓的一次转程中击打一捆6次。2)轴击一次的时间为0.01 ~ 0.02秒。这个时间取决于脱粒鼓的转速。3)与法向角相比，设置较大或较小的导粒角均可使脱粒力增大。4)一次脱粒率随导粒角倾角的增大而增大。(5)脱粒齿对脱粒力的影响随脱粒齿的前后位置而增大，而随脱粒齿的同时击打而增大。少

The threshinc., operation in the threshin, , & part of head feedin-, type combine consists of the pulling and squeezin" action of ears of rice plant with the threshinla, tooth, the friction with a concave, and the other conditions. It is an object of this study to clear the threshing operation by the threshine teeth. The experimental device measurinc., the threshin-r force of a threshinc, tooth was made by using some parts of a commercial type head feeding combine. It is known from the past experiment that the threshinu operation changes accordine to the settine condition of threshina tooth(the inclination ancle, the lead m 'm C3 anclle, the settine ancle, the settine pitch, the rotatine pitch), so a threshine tooth measuring the threshine force is set on the threshina drum in this experiment. The threshing tooth is independent of the threshing drum, but rotates with the same rotating radius and speed of the threshing drum. The parameters of this study are the setting pitch, the rotati … More ne pitch, and the lead angle of threshing tooth. The measuring points are the bending, moment and the torsional moment of the threshing tooth measuring the threshing force, and the driving torque and the rotating speed of the threshing drum. The experiment was done by using a sheaf of rice plant(variety KINMAZE)with the weight of about 1kgf that is made by gathering 6 8 hills of rice plant. The measuring terms about the sheaf of rice plant are the total weight before and after passina the experimental device and the weight of ears that is threshed and dropped under the concave and the rear position of threshing drum, and the threshing rate and the cumulative threshing rate are calculated from these data.The following matters are found from the experimental results.1)The threshing tooth measuring the threshing force strikes a sheaf 6 times during a pass of the threshing drum.2)The time for a strike of the sheaf is from 0.01 to 0.02 second. This time depends on the rotating speed of threshing drum.3)The threshing force increases in case with set larger or smaller lead angle in comparison with the normal angle.4)The threshing rate by a pass increases with the inclination of lead angle.5)It is found that the influence of threshing tooth upon the threshing force increases by the threshing teeth that are in pre- or postpositions rather than the the threshing teeth that strike at the same time. Less