The soil resistances of a plow are the three dimensional forces. Using the 6 comp. tillage meter, I measured characteristics of the plow resistances with a 9″ plow (without a coulter and a landside) on sandy soil, varing the plowing depth 5-10cm. The results are as follow. (The datas are mean values with each 5m running) (1) The centers of resistances of a plow distribute upon it surface, with-in one-third to two-thirds of the plowing depthes and a quarter to one-half of the plow width from the land side (Fig. 2). (2) The longitudinal resistances RL have larger value and tendency to increase more rapidly with depth than the vertical and side forces RV and RS (Fig. 3). (3) The directions of the vectors of the partial resultants in vertical and horizontal plane, RD and RH are presented with angles α and β. α increase with t, reache max. and decrease with more depth. β are vice versa. (4) The specific resistances κ have min. values to t=10cm. (5) The moments about a setting the point of the plow body to beam, My are larger than Mx, and Mz, but not increase so rapidly as RL to t (Fig. 5).
(1) We have investigated the characteristics of the soil displacement for the rotary and crank type tillaging machines at the rice field of Hokkaido University. (2) The same results which were described in the summary I-(3), (4) may be applied to hard and dry soil, too. (3) The relation may exist between M and the number of rice stubbles which are exposed to the unit area on the surface of the field. (4) But it cannot indicate appropriately the soil displacement with an action which covers the rice stubbles, so-called the inversion by the tillaging machines. Therefore, instead of the expression called as inversion, we have introduced the mixing grade of soil “M” and defined to indicate the soil displacement with M.
1. By means of the annexation of guide vane to the element tube and the replacement of bended wall above the oil reservior with the rightangled wall, the capacity of the cleaner was increased by 13.6 percent. 2. According to the comparative test, the cleaner of the Kohler engine of Bolens power hoe, especially its element, proved to have excellent capacity. 3. Discussion on the moving mechanism of element, with special reference to “bridge formation, ” particle dynamics, and the ununiformity of element texture is given. 4. Functional relation of the general factors with refererence to air flow through the filtration layer is described. 5. Description on the cleaner resistance consisting of the resistance of dust-laden layer and the inner resistance of cleaner is given. 6. “Scouring effect” and “plugging” at the cleaner element which are liable to occur at the first stage of the constant pressure filtration are concerned. 7. Contrifugal effect resulting from the interfial resistance of the particle to change its direction of travel in conformance with the streamlines of the flowing air at the bottom of the cleaner is stated.
Durableness steels such as SK, SUP, SKS, SMnL, SCMn and FCW was studied. Durability of steel against wear increases with the amount of carbon content, if the other condition is constant. Silicium is not effect upon the durability. Increasing content of Silicium in steel makes rather decrease of the durability but little. Manganese is desirable for the durability of steels at an experimental extent. In the case of carbon steel having same composition, the durability of each steels shows the same value, if each hardness value of quenched and as rolled condition is same. Chromium and tungsten brings good effect, but the enfluence of tungsten is not great as carbon. Hardness of annealed SMnL is low and the amount of loss in weight by abrasion is large, and the amount is large about as from seventy to eighty per cent of quenched one. The mean value of abrasion of SCMn, FCW and SK 5 were compared with respectively. In the case of the humidity and the granulation of soil, and the running velocity of sample were constant, the mean value of abrasion of each samples changes with the running distance keeping almost linear relationships. The mean value of abrasion of 0.85 per cent of carbon steel shows maximum value, the value of heat treated manganese steel shows about one twoth of it and that of white pig iron about one threeth.
I made a new revolving dynamometer for trial, which could measure simply the power required of moving machines at desired places. The principal parts of this machine are composed of springs which variate in accordance with load at working, and of recording apparatus on which the variation of springs are recorded. When experimented with a crank typed power tiller, the characters of this machine were acknowledged to be satisfied.
In accordance with regulating methods, the grain sorters are divided into four type: i. e. none, plain vertical and solid type. Furthermore, each are divided into two kinds: i. e. parallel and fanwise. So, in conclusion, we must think eight kinds of sifting mechanism. In the fourth report, I suggested the sifting theory as regards to the ideal case, that is, parallel mechanism with plain regulating type. And now I confirmed that this theory come into existance of the eight cases as described above. I have treated of the mechanism of only one grain, to tell the truth, however, a large quantity of grains are sifted at the same time. In this report, out of my theory, I should like to consider the statistical method to calculate the sifting ratio of grain which diameter is known. These method are as follows. At the first, as described in the second report, calculated the efficiency of area ηx out of methematical treatment. Next, We must calculate the sifting efficiency ηs as regard to the condition belonging to the time in the theory, but this way is very troublesome. For this reason, I thought of the monography by which ηs is simply calculate. I should like to call it “Miyoshi's Monography”. Thus the sifting ratio of grains is simply calculated from the formula η=ηsηa. As the result of numbers of experiments, it was proved that this statistical treatment is right and of practical use.
In order to investigate the influence of the fitting angle of winnower wings, in the theoretical study the potential equation was fixed by the conformal representation which in gained by using, at first, the vortical flow gusted out of the part near the foot of the runner and then the circulation round the wings. And in the results of culculation through these equation in the case of the dimensions of the sample winnowing fans used in the rice huller, we found the potential velocity about 10m/s and rapider air velocity was required at the angle which inclines to the rotating direction of blowing blades. (say+wing) In the practical study, when we measured the wind velocity, those practical values obtained were the same as the above-mentioned value theoreticalley calculated. The most efficacy of the sections wind velocity-distribution according to various fitting angles was found in the case of 0° by the method of scoring marks. Comparison by the separation is generally made by the gathering quantity, consisting of paddy, crashed rice and husk, at the Second Mouth and Third Mouth of wind flow outlet of winnowing fan; and we found +11° the most efficient of all the cases in the experiment. In conclusion, + angle wings were very useful owing to rapid wind velocity, hence we should use them at the range of 0°-+30° As for the number of winnowing fan wings, three leaves in proved to be the most efficient through our experiment.
In this investigation, we attemped to compare the wear amounts of the ordinary tine and the fiat knife tine (Nata Tsume) in the field equiped with two power tillers and studied on the wear of the fiat knife tines made from several kinds of the special steel by the wear test machine. In the field test, the flat knife tine wore away considerably and after fifteen hours' running, the rate of wear of width reached about 55%, that is about 3.5 times as great as the ordinary tine, and it was not more used. In the laboratory test by the wear test machine, it was not recognized the large difference of the wear amounts between the carbon steel and the special steel tines. It seems the wear amounts of the tines are varied with the shape rather than the hardness.
1. According to this experiment, large diameter roll was higher than small one in hulling capacity. 2. In proportion to the roll diameter increase as being with burden the difference of necessary horse-power increase. 3. About the hulling quantity of unhulled rice large roll is more efficient than small one every hour. 4. From the above result, the practical gum-roll diameter in the highest efficiency is supposed to be 61/2 inches or so in minimum, and 91/2 inches or so in maximum. 5. Accordance with the increase of the rate of circuit speed, the hulling power increase, but does not rise by the same increasing rate. 6. As to the relation of horse-power, the greater the rate of circuit speed is, the greater the needed horse-power is. 7. The hulling quantity of unhulled rice every hour is closely connected with rate of hulling and increase the rate of circuit speed. 8. The quality of unhulled rice is in the hight condition is the 30-35% rate, though the skin hulling and carbon adhesion, crushing rice quantity are increased by increasing of rate of circuit speed.
On the dusting method of Duster, it is necessary that the times of dust discharge must be uniform for protect from injury of plant by agricultural chemicals and the effect of Pest control for plant are uniformed. In this view, we made a Cyclone for trial to measure the variations of dust discharging times continuously, by applying the Stoke's low of Fluid dynamics. As the result, we could measure the variations of dust discharging time about some Knapsack type engine duster, on high Withdrawal efficiency of dust (=85%) continuously. Wherefore, we are thought that must be study the mechanism of dust disharge, because many dusters have characters of un-uniformed dust discharge almost.
(1) Ecologically as same as the 1st report, we analysed the farmar's technique of farm machinery driving about the rice threshing work by motor-threshers. (2) The efficiency of the threshing work is determined by all of four-grouped factors, belonging to machinery, bundles of rice, labourers and working methods (3) The eco-types of those factor are not only given by the regional and farming conditions, but are also correlated each other.