巻号一覧
33 巻, 4 号
選択された号の論文の16件中1～16を表示しています
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常松 栄1972 年 33 巻 4 号 p. 330-331
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (472K) -
芝野 保徳1972 年 33 巻 4 号 p. 332-337
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe power requirement of tillage were measured by using the simple inclined tillage tool or the vertical tillage tool attached at the front of rotary tilling device of walking tractor. The characteristcs of the combination tillage were summarized as follows:
(1) The drafts of drawn tillage tools 60-120kg.
(2) The torque of rotary shaft in the combination tillage was about 0.5-0.6 times as large as that in the rotary tillage.
(3) The torque of driving wheel shaft in the combination tillage was about 0.9-0.95 times as large as that in the tillage using only the drawn tillage tool because the tractor was pushed by forward component of resistance force of tillage.
(4) The dynamic weight on the driving wheel in the combination tillage using the vertical tillage tool was ligher than the static weight on it, while that using the simple inclined tillage tool was heavier.
(5) The total power requirement in the combination tillage was about 0.6-0.8 times as large as that in the rotary tillage.
(6) The pulverizing effect in the combination tillage was generally bar better than that in the rotary tillage.抄録全体を表示PDF形式でダウンロード (2987K) -
実用機の振動について荒牧 利武, 安部 武美, 山下 淳1972 年 33 巻 4 号 p. 338-343
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe objects of the work reported here are (1) to investigate the characteristice of the random produced by practical agricultural machinery and to reduce severity of vibration imparted to operators, (2) to study on the threshold limit of local vibration.
The results of test are as follows:
(1) The characteristics of this transmissibility are related to resilience by holding the machine, and damping at high frequencies.
(2) The combination of the hand, radius and elbow joint forms an effective broad-band isolation system which tend to prevent high-frequency vibration propagation.
(3) Higher pulse rate takes place over a range of 3-5g.
(4) The new limit value curve is a little lower than the cuve by using sinusoidal input.抄録全体を表示PDF形式でダウンロード (917K) -
石原 昂, 岩崎 正美1972 年 33 巻 4 号 p. 344-348
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーIn this paper, the dust feed mechanism of knapsack power duster with blow tank were studied experimentally. The discharge of dust and the static pressure of the blast pipe, the discharge pipe and the hopper were recorded by an electromagnetic oscillograph. The following results were obtained.
1) In general, the discharge of dust decreases with the decrease of dust filled in the hopper. This tendency is not affected by the vibration.
2) The rate of the discharge fluctuation increases with the increase of distance between the spout on the bottom in the hopper and the inlet of the blow pipe.
3) As the static pressure in the hopper increases, the discharge of dust increases.
4) When the engine vibration is not propagated to the hopper, a large quantity of the dust remains in the hopper.
5) Generally, the vibration gives fluidity to the dust in the hopper.
6) But it can be considered that there is no effect of the vibration, when the dust filled in the hopper decreases under 20 percent.抄録全体を表示PDF形式でダウンロード (882K) -
小泉 武紀1972 年 33 巻 4 号 p. 349-354
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーIn order to develop the analysis of vibration for portable rotary cutters, natural frequencies were calculated using the following simplified model. The model chosen consists of freely suspended beams which are connected with each other at 5 points by springs. The first beam of them has 5 mass on it, and the second one is uniform.
The calculation procedures used are the Myklestad method (A), transfer matrix method for nummerical analysis (B) and transfer method for analytical analysis (C). Results obtaind are as follows:
(1) Linear spring rate greater than about 500kg/cm affected little on the secondary natural frequency and these natural frequencies were very near from those of similar model in which two beams were connected by suporting points instead of springs.
(2) When the linear spring rate is very high the calculation errors by electronic computor grow great and it may be impossible to solve simultaneous equations at last stage of these calculations.
(3) As for calculation time, A method was least and B method was greatest in this case. These calculation methods seem to be very convenient, like finite element method, for models which consist of complicated beams.抄録全体を表示PDF形式でダウンロード (949K) -
往復, だ円, 円運動の場合岩尾 俊男, 川村 登1972 年 33 巻 4 号 p. 355-360
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThis paper is the results of experimental studies on the screening rate under the reciprocating, elliptical and circular motions. The four-bar linkages was adopted to oscillate the screen in that motion respectively. The opening size of screen was 6.90mm-screen, and the sample of soy-bean used for the screening test was of the uniformed size, viz. 5.66mm<particle size<6.73mm-screen, which had been screened on a standard testing sieve in a Rotap shaker.
The main results were as follows:
1) The most suitable frequency varied as feeding rates and the oscillating types of screen, and the screening rate of the most suitable frequency decreased with the increase of the feeding rate.
2) Although the screening rate varied with flowing velocity, in the case of small feeding rates, the screening rate of grains under the reciprocating motion was slightly greater than that of elliptical and circular motions, while in the case of larger amount of feeding rates, the screening rates of grains under the elliptical and circular motions were greater than that of reciprocating motion. In the latter case, the flowing velocity of grains on the screen surface was about 30-40cm/sec.
3) Varying the frequencies, the relationship between the screening time and screening rate was given by the logarithmic probability function in the earlier period and by the exponential function in the later period.
4) Varying the length of sereens, the relationship between the screening time and the screening rate was given by the exponential function in the earlier period and by the logarithmic proba bility function in the later period. These characteristics of the screening were similar to the experimental results with the Ro-tap shaker抄録全体を表示PDF形式でダウンロード (2534K) -
山口 信吉, 若林 嘉一郎1972 年 33 巻 4 号 p. 361-368
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe spouted bed technique has been applied to the operations bringing fluids into contact with solid particles which are too coarse to fluidize. It was recognized that the spouted bed might be applicable to the dryer of the unhulled rice.
This paper presents the available data for designing of the spouted bed, using unhulled rice as solid materials and air as spouting medium, as follows:
(1) The desirable operations in the spouted bed in practice were obtained under the conditions; Di/Dc=1/5-1/4, Lo/Dc=2-3. In this paper, pressure drop and air flow rate were discussed under these conditions, where Di was the diameter of air inlet, Dc the diameter of spouted column, and Lo the height of the bed at the fixed state.
(2) ΔPm/Loγb depended not upon Do/Dc but upon Di/Dc, where ΔPm was the maximum pressure drop in the spouted column and γb was the bulk specific-weight of the bed at fixed state.
(3) ΔPm/Loγb had any value ranging from 1.3 to 2.0. Here, Loγb corresponds to the pressure drop in the fluidized bed.
(4) Gm/Gmf had any value ranging from 0.8 to 0.9. Here Gm is the air mass-velocity at the maximum pressure drop in the spouted column and Gmf is the minimum air mass-velocity required for fluidization.
(5) ΔPs/Loγb had any value ranging from 0.5 to 0.8. Here ΔPs is the spouting pressure drop.
(6) Gs/Gmf had the value about 1.5. Here, Gs, a new concept presented in this paper, is minimum air mass-velocity for steady spouting.抄録全体を表示PDF形式でダウンロード (1320K) -
小泉 武紀, 福島 信博1972 年 33 巻 4 号 p. 369-374
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーIn order to improve the threshing performance of Head Feeding Thresher, an apparatus for the laboratory experiment was reconstructed from two Manually Feeding Threshers and some tests were carried out for some paddy bundles. Bundles were threshed in suspended condition by two cylinders rotating oposite to each other while they fed through the clearance between them from upper position at entrance to lower position at end. The concaves were removed to know the threshing function of this threshing method. The results obtained are as follows;
(1) As the height of bundles increases, the torn pieces of heads and rubbish decrease.
(2) Tensile force loaded to bundle at threshing and its fluctuation are great near entrance, but they are small at the other position
(3) The percentage of torn heads (ears) are greater at the first half than at the latter half of the bassage of bundle in threshing.
(4) The threshing capacity are great, and it seems that there will be still various means to raise up greatly the capacity of Head (Ear) Feeding thresher.抄録全体を表示PDF形式でダウンロード (909K) -
荷受部のシミュレーション山下 律也, 加治 範行, 松田 良一1972 年 33 巻 4 号 p. 375-384
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThis paper is concerned with an optimalization in the design and operation of the plant for drying paddy.
Since the plant is used for a short term and set under the unprofitable state, it is necessary to design the plant rationally and operate it efficiently. And hourly and dayly fluctuations of the amount of the paddy received are great. This makes the operation more difficult. Authors studied a case of Ohmi-Hachiman Aglicultural Cooperative Association, and tried to shimulate the accumulated stock at the receipt department to grasp the nature of the subject and get an optimum standard for design.
The main conditions and results were as follows:
A) Conditions
1) The quantities received by the hour were varied by binder (type 1) or combine reaping (type 4), and then we made the comparision of the stock between type 1 and type 4.
2) The quantities received by the day were varied by weather and another factors, and then we used the actural receiving data.
B) Results
1) In the case of 1, 200t. total, type 1, the quantities of the stock will be disposed without affecting the quantities received on the next day, if paddy is disposed at the rate of 3.0t/h.
In order to reduce the stock accumulated and the length of the overtime work, it is necessary to increase processing speed, while the operation rate will be reduced. In case of type 4, the receipt is concentrated in the evening and the stock is increased more substantially than type 1. Thus it is necessary to increase the processing speed by 0.5-1.0t/h beyond that of type 1.
2) In the case of 2000t. total, it ts necessary to set the processing speed at more than 5t/h. Since overtime work decreases exponentially with processing speed, the effect of increased process speed is more pronounced.
3) The accumulated stock was able to be computed according to processing speed if the rough receiving pattern by the hour and also by the day, the total amount received, and total number of days required had been presumed. Thus the most appropriate processing speed would be found by regulating the condition of the stock.抄録全体を表示PDF形式でダウンロード (1561K) -
細川 明, 吉田 富穂1972 年 33 巻 4 号 p. 385-393
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe Carter dockage tester which was manufactured by Carter Day Company to meet specifications of the USDA was tested by the writers to see if the tester would be used for testing Japanese varieties-Reimei and Yoneshiro, which were received at the Hachirogata country elevator.
Tests were made to establish the procedure and the proper riddle and sieves to use so as to make test results consistently as close to the results obtained by conventional hand testing as possible. The riddle and sieve requirement thus established is given in Table 5 together with air and feed control settings.
The percentege of brown rice which were estimated by the dockage tester testing compared very closely with the actual percentege of brown rice determined by the current method used at the country elevetor. Table 6. The present testing method requires drying and hulling of sample rough rice and therefore is laborious and time consuming.
The experimental results the writers obtained suggested a possibility of using the dockage tester to replace the current testing method, thereby enabling to obtain more consistent test results and also eliminating nearly all costly hand testing operations.抄録全体を表示PDF形式でダウンロード (1248K) -
機械価格による経済性の比較木谷 収1972 年 33 巻 4 号 p. 394-398
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe main aim of this study is to find an optimum higher speed of farm machinery to achieve greater field capacity and performance. The most economical speed was sought for by computing the initial prices of implements (Japanese plow and tractor-mounted rotary tiller) and tractor at higher speeds or at larger operating widths.
The operating resistance acting uponimplements and tractor was assumed to be described as a quadratic function of operating speed. Then the engine power and weight of implements and tractor at a certain operating speed were approximately calculated. Thus the initial prices of implements and tractors were obtained and compared with each other.
The main results were the followings.
(1) Speeding-up is more economical than widening of operating implements up to a certain level of higher speed.
(2) The optimum speeds in terms of initial price are 7km/hr (about 2 times of the conventional speed) for Japanese plow and 6km/hr (about 3 times as large) for tractor-mounted rotary tiller.
(3) Economical profit of speeding-up is greater for smaller implements and tractor than for larger ones so for as the initial prices are concerned.抄録全体を表示PDF形式でダウンロード (722K) -
バラ積みコンテナの設計試作とみかんの安全性中馬 豊, 岩元 睦夫, 志賀 徹1972 年 33 巻 4 号 p. 399-405
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーA container for the bulk-transportation of Citrus Unshu was designed and set up by way of trial. Above all, the stacking height into the container was investigated from the point of physico-mechanical properties of fruit.
1. The items of the container were as follow; materials: SS 41, weight: 98kg, inner dimension: 999(B)×1549(L)×830(H)(mm), outer dimension: 1095(B)×1690(L)×1000(H)(mm) Durability for any possible loads or forces acting during the transportation was checked for safety by analytical calculations.
2. Filling 600kg of Citrus Unshu into the container resulted in the stacking height of 70cm and loading weight of 2kg acting on each fruit on the bottom. Under the 2kg and 60 hour staticloading, which simulated the sea transportation from Fukuoka to Tokyo, the fruit did not rupture and the deformation was less than 6.16mm.
3. Stacking height of 81.6cm was calculated by Ross' equation to make the compressive force acting on the bottom fruit of container, less than 2kg. Hence, the stacking of 70cm of Citrus Unshu in the container could be seen useable.抄録全体を表示PDF形式でダウンロード (1028K) -
小野田 明彦, 村田 敏, 中馬 豊1972 年 33 巻 4 号 p. 406-411
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーBulk modulus of fruits and vegetables were calculated by measuring the supporting reaction force in liquid and air under various negative atomospheric conditions. By using the same apparatus, the surface tensile strain of fruite and vegetables were also obtained that seemed to give an explanation to the cause of damaging during the process of vacuum cooling of a berry.
This method of instrumentation had tow characteristics;
(1) Volume expansion of specimen was electrically measured by using the U-gage, and recorded.
(2) By the same principle, it was possible to measure the bulk modulus under the positive pressure.
The bulk modulus of apples (KOKKO), cucumbers, tomatoes, potatoes and taroes were measued.
The results were shown in Table 2.抄録全体を表示PDF形式でダウンロード (2624K) -
研究用自動育蚕装置の試作田原 虎次, 藍 房和, 渡辺 兼五1972 年 33 巻 4 号 p. 412-417
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThis paper is concerned with the construction of a model automatic silkworm rearing equipment.
The fundamental design features were as follows,
1. Acommodating as much nursery silkworm as possible into the rearing room of a predetermineted area.
2. Making the feeding efficiency to be a maximun.
3. Providing the room with reasonable air conditioning.
The structure of the trial equipment was composed of the rearing machine and an air conditioner.
Rearing machine was composed of the movable rearing bed, the feeding portion and the control mechanism.
The air conditioner was used only to condition the rearing bed, which was integrated to the rearing machine as a unit.抄録全体を表示PDF形式でダウンロード (1002K) -
山沢 新吾, 吉崎 繁, 前川 孝昭, 原沢 晧二1972 年 33 巻 4 号 p. 418-422
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーThe authors investigated the relationship between moisture contents of hull and flowabilities after drying unhulled rice of high moisture content by pneumatic conveying drying.
The following results were obtained:
1) The pneumatic conveying drying of unhulled rice was not suitable from the practical standpoint of the drying rate, and the rising temperature of unhulled rice. But it was very effective for drying particularly hull of unhulled rice because of the high temperature of drying air (more than 200°C).
2) The pneumatic conveying drying of unhulled rice was useful as a pre-dryer in the rice mill because the flowability was improved by this method.
3) There was little effect of this method on germination and cracking of kernels of unhulled rice under the conditions of this experiment.
4) Although the moisture of the hulled rice transfered to the hull after drying, the flowability was not altered.抄録全体を表示PDF形式でダウンロード (716K) -
小池 正之1972 年 33 巻 4 号 p. 423-426
発行日: 1972/03/01
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (726K)
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