農業機械学会誌
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
28 巻 , 4 号
選択された号の論文の12件中1~12を表示しています
  • 竹田 策三
    1967 年 28 巻 4 号 p. 197-203
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    The following results obtained in the test of the engine oil, which contained some friction-proof agents.
    1 The engine performance was constant, but lowerd the temperature of oils by about 7-8° C when Moly Slip was added.
    2 Fuel consumption was unchangable.
    3 It was supposed that the oil consumption depended mainly upon the number of oil rings are not upon the friction-proof agent.
    4 Any effect of the friction-proof agent was not recognized in the results of both physical and chemical analyses, such as the carbon residue, ash content, total base number, and the n-pentane insolube.
    5 The effect of friction-proof agent was recognized in boundary lubricant, for example, in case of four ball test.
    From the above result, little effect of the friction-proof agent was recognized under the moving condition of 1/2 load and 1300rpm. Reverse result, however, might have been obtained under the moving condition of over-load and max, revolution.
  • 田辺 一, 来田 茂, 増田 治策, 川崎 健
    1967 年 28 巻 4 号 p. 204-207,203
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    We studied on the drafting character of the 4 wheel tractor along the contour line on the slope field. The test results are as follows;
    1. The traction force and the power reduce with increase of the inclination of land. The maximum traction powers are reduced by 80% at 10° in angle of field inclination, 55% at 15° and about 40% at 20° as against that of the level field. The traction forces show similar tendency to above.
    2. Judging from the traveling posture of tractor, we resulted that the lowering of the drafting character mentioned above was caused by the followings;
    1) Larger running resistance and less component of driving force of wheel, having angle against the running direction on accont of the side slip.
    2) Less weight of the hill side wheel by the inclination of tractor body, and less driving force by the action of the differential transmission gear device. And the traction force takes the value represented by the equation (9), and the maximum traction forces are less than two times of the driving force of the hill side wheel. Consequently, on the purpose of the prevention of the lowering of the drafting character, limitation of the skids of body and limited slipping or locking the working of the differential gear device are considered to be effective.
  • 小嶋 和雄, 村田 敏, 吉村 克規, 大久保 淳一
    1967 年 28 巻 4 号 p. 208-211,203
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    Misfeed of cell type metering device is considered to be caused by the following cases:
    1) some dynamic conditions are not satisfied between the cell and the seed.
    2) there is no seed on the cell. The purpose of this paper is to analyze the latter. It is assumed that the distribution of seeds on the seed plate is consisted in the conbination of a regular arrangement with a random one, and then the probability distribution function is derived as follows:
    P(X)=e-(μ-κ)S{(μ-κ)S}X-κ⋅S/(X-κ⋅S+1)
    where
    P(X)=the probability that the constant area S on the seed plate contains exactly X seed grains.
    X=number of seed grains in the constant area S on the seed plate.
    S=the constant area on the seed plate.
    μ=mean number of seed grains in unit area on the seed plate.
    κ=number of seed grains in a regular arrangement of unit area on the seed plate.
    Then this assumption was verified by comparing the theoretical distribution with practical one photographed under glass bottomed seed hopper, and the value of μ and κ were determined as μ=0.8 1, 2.60, 3.40, 5.02 and κ=0.43, 1.80, 2.00, 3.60 with maize, soybean, unhulled rice, and coated beet respectively.
    It may be concluded that the accurate feed is carried out when the traced ring of the part of cell in which seed grain can drop occupies more area than 2.33cm2, 0.56cm2, 0.50cm2, 0.28cm2, the invers number of κ, with maize, soy bean, unhulled rice and coated beet respectively.
  • 川村 登, 山下 律也, 赤瀬 章
    1967 年 28 巻 4 号 p. 212-216
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    A cone type thresher is constructed of a conical cylinder (inner cone) and a conical concave (outer cone). Research described in this paper was conducted to investigate the threshing efficiency of rice, separating efficiency, threshing loss, cleaning efficiency, damage of rice and rice threshing power requirement of the cone type thresher.
    The effect of inner cone speed upon the threshing efficiency is larger than that of outer cone speed and the effect of outer cone speed upon the separating efficiency is larger than that of inner cone speed.
    When inner cone speed is 600 to 800rpm, outer cone speed is 200rpm and the rotating direction of both cones is same, both threshing loss and damage of rice become below 1 percent.
    The feeding rate must be increased through improvement of the feeding mechanism.
  • 川村 登, 山下 律也, 中谷 正一, 池田 善郎
    1967 年 28 巻 4 号 p. 217-222,226
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    Combines possess the complex mechanisms and characteristics of the power requirements. We measured grain losses, torques and revolutions at each element of rice-combine, and in this paper the fluctuations of the torques and the distributions of power requirements were discussed. As a result of these experiments and discussions the following were obtained.
    1) The grain loss was 4.5 per cent when a operating condition was good, but in the case of harvesting the lodging rice the grain loss amounted to 20 per cent. The greater part of this grain loss was the cylinder and straw rack loss, especially the most part of the cylinder loss was due to unripe grains.
    2) power requirements of combine were closely related with the feed rate of the rice to be threshed, that is, power requirement was 26.5 PS when feed rate was 85.1kg/min and 13.5 PS when 40kg/min.
    3) The characteristics of the load at each element were different. That is
    a) The power at threshing cylinder was most closely related with the feed rate. It was 11.6 PS on the average when the feed rate was 85.1kg/min and 4.7 PS on the average when 49kg/min.
    b) The cutter-bar power did not vary widely depending on the test conditions, and its value through the tests was small, about 1 PS.
    c) Because of the low travelling speeds through the experiments, its maximum value was 0.32m/sec, the travelling power were small, that is from 4 PS to 8 PS.
    4) The forces acted to the concave through straws by the threshing cylinder increased at intervals of 1.2 sec to 2.5 sec.
    This seems to occur because the flow of the rice fed to the cylinder was not uniform. Hence, torques at the cylinder shaft also showed wide fluctuations. However, the torques at the engine and travelling counter shaft did not show such wide fluctuations as the cylinder shaft.
    This fact seems to show that because of the great mass moments of inertia of the main rotating parts, especially of the cylinder, the kinetic energies of these parts compensate the momentary increase of the loads at the cylinder.
  • 梅田 重夫, 滝川 博, 大塚 幹夫, 楠瀬 正美
    1967 年 28 巻 4 号 p. 223-226
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    The grain separation in this small header combine were performed by the wind from the blowers. The performance of separation were much affected the feed rate of straw i. e. height of cutting.
    It is desirable that the capacity of the elements, for example, cutting, threshing and separation unit are balanced and each unit are adjustable independently for avoid the interference between each power unit in these combine.
  • 東条 衛, 岡村 太成
    1967 年 28 巻 4 号 p. 227-231
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    On the basis of the results obtained from these investigations, it appears that the following summary is justified.
    (1) The evaporated water was found to inclease in value when the drying temperature incleased under any given condition of constant relative humidity, but it was not so clear in contrast with this.
    (2) There were so large differences among equilibrium moisture contents Me, calculated from three voluntary portions. It was found that the drying constant K is a function of the temperature of the drying air. This method of calculating the equilibrium moisture content may make up higher value than the one observed. Further study on the determining of the Me appears advisable.
    (3) The isotherms were constructed by plotting for each temperature the equilibrium moisture content values (dry basis), as ordinates against the corresponding values of relative humidity on the abscissas. Those resulted from the data of natural soybean were nearer to the abscissa than these from remoistened soybean. It may indicate that there is possibility of the presence of the hysteresis loop between those and these isotherms. The curves of these isotherms obtained in these investigations depart from one of Henderson's especially in the range of higher relative humidity.
    (4) The straight line was obtained when the function ln M-Me/M0-Me is plotted against the time. the slope of the straight line gives the value of the drying constant K, and the segment gives that of constant a, dependent on particle shape directly. There was the high correlation between K and a, and lnK found to be the function of the 1/T.
    (5) The air-oven method of measuring the moisture content of soybean will give higher results possibly indicating the presence of volatile ingredients and the dehydration of carbohydrates in soybean during the heating. This improvement may be gained only at the comparison with other various methods.
  • 安部 武美, 池見 隆男
    1967 年 28 巻 4 号 p. 232-234,231
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    The test was conducted by ascending air current aspirator, produced by way of experiment, for the purpose of separating bran in rice polishing process, and the following results were obtained.
    1. the amount of rice, flowing from separating pipe into cyclon (1), increases with the mixed ratio and diminishes, on the contrary, with the amount of air flow, and does not flow-in beneath 4m/s of velocity.
    2. Pressure loss in separating pipe increased suddenly with the air velocity higher than 4m/s.
    3. The Fractional Recovery Efficiency turns onto the tendency of increasing with the mixed ratio near the air velocity of 4m/s. The efficiency increased on the side of low velocity, whereas the critical granular size diminishes with one.
    4. Newton's Separation Efficiency showed high near the air velocity of 3m/s, and decreased inversely with the lower velocity because of the value of (mixed ratio/pressure loss) increases. The critical granular size diminished on the side of higher air velocity accompanied with the increase of ratio of (mixed ratio/pressure loss).
    5. The length of separating pipe effects much on the separating efficiency, the length of 50cm is enough on this point of view for this presented apparatus.
  • 吉崎 繁, 松岡 孝尚
    1967 年 28 巻 4 号 p. 235-237,231
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
    The ejector feeder does not require power in particular, besides it is cheap, simple designed equipment.
    Solids loading can be varied largely by changing the opening ratio. Further, the solids loading can be expressed by the equation (2)
    Useful concepts in designing the feeder suggested from the investigation are;
    (i) solids loading increases linearly with increase of the opening ratio,
    (ii) solids loading can be cosnidered to be independent of the jet length,
    (iii) solids rate increases linearly with increase of the jet velocity, then the fact is extremely advantageous in view of control,
    (iv) the pressure at the feed chamber increases with increase of the back-pressure, hence, the feeder is unsuitable to conney through long distance or narrow duct,
    (v) the diffuser angle have little effect on the solids loading, and
    (vi) difference of characteristics between the feeder for horizontal and that for vertical flow is not essentially recognized.
  • 山下 律也
    1967 年 28 巻 4 号 p. 238-243
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
  • 町田 武美
    1967 年 28 巻 4 号 p. 244-248
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
  • 1967 年 28 巻 4 号 p. 255-257
    発行日: 1967/03/01
    公開日: 2010/04/30
    ジャーナル フリー
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