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74 巻, 838 号
選択された号の論文の9件中1～9を表示しています
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磯部 俊郎1958 年 74 巻 838 号 p. 214-217
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーThere are many researches and reports about underground transportation. But they are almost on the machines, snch as belt conveyers, winders, locomotives, etc. And I have scarcely met the discussions concerning the transporting system of underground traffics. In recent years, the methods of contineous transportations have been exceedingly developed, nevertherless the mine tubs are still essential in the mine haulage system.
On this paper, the auther described some numerical conclusions about the circulations of mine tubs at the Chikubetsu Coal Mine, Haboro Colliery, in Hokkaido. And I think these conclusions have general meanings for underground mine tub traffic.
Conclusions.
(1) The distribution of frequencies of circulations of mine tubs shows Poisson's one.
(2) The circulating time is proportional to its distance, which indicates the number of tubs containing in one circulation.抄録全体を表示PDF形式でダウンロード (2764K) -
木下 重教1958 年 74 巻 838 号 p. 218-225
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーThe present investigation is a continuation of previous study on the drilling performans and drillability of rocks by rotary drills.
In this research the following experimental formula have been newly determined.
T=Cp·√b·√t·l
T: the axial thrust necessary to get a certain penetration rate per revolution with two wingcd bit (kg).
b: mean value of bit wear in width measured at the center of each cutting edge (mm).
t: the penetration rate per revolution ranging from 0.065 to 0.47mm.
l: the total length of cutting edge (mm).
Cp, : constant depending upon rock property (kg/mm2)
As theCpin this formula is seemed to be a useful index to diagnose rotary drilling resistance, it is compared with the mechanical, hardness properties of rocks. As the result it was found that the valueCpis approximately proportional to the square root of the product of compressive strength, indentation hardness and shore hardness of rock.
The reason of this is explained in the last part of this paper.抄録全体を表示PDF形式でダウンロード (3143K) -
会田 俊夫, 岡本 隆1958 年 74 巻 838 号 p. 226-230
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーIn this paper, a method of computation of driving power of coal cutter required to the coal seam cutting was described. The foundamental formulas of the driving power were introduced in comformity with results obtained from several experiments already showed in the last report, and the cutter chain velocity, feed velocity and depth of cut-in of cutter jib influence upon the driving power were studied and these values were compared to the practical experimental results of coal cutter at the coal face underground.
Furthermore the fluctuation of driving power in cutting was discussed and the causes of fluctuatiop were made clear.抄録全体を表示PDF形式でダウンロード (2944K) -
秋吉 利男1958 年 74 巻 838 号 p. 231-235
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーThis paper proposes the Rope Performance (total work done divided by the weight of wire rope) as present standard value to winding performance. It expresses the theoretical. formula and the simple formula to show the Rope Performance, and proves to be able to use the simple formula for calculation of the Rope Performance by the examples.
The values of the Rope Performance are as follows:
Rope Performance 240t·km/ kg for drum winding
550t·km/kg for koepe winding.
And the methods of determining and examining about the Rope Performance, and other values of winding performance are explained by the nomogram.
Besides. the author has obtained several results of examining about some actual vertical shafts.抄録全体を表示PDF形式でダウンロード (756K) -
藤本 敏治1958 年 74 巻 838 号 p. 237-242
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーThe pressure drop in the wet cyclone is an important item together with its performances, because the pump, which is used for the wet cyclone, must be selected according to the pressure drop, and the necessary energy depends upon the pressure drop and the liquid quantity.
The author has measured the pressure difference between the inlet and the overflow pipe under the various operating conditions.
The influences of the following factors upon the pressure drop were investigated:(1) Feed inlet velocity, (2) Diameters of vortex finder, underflow nozzle and cylindrical portion, (3) Size of inlet nozzle, (4) Height of cyclone, (5) Inserted length of vortex finder, (6) Types of feeding, (7) Pulp density of feed slurries.
From the above experimental results, author showed that the pressure drop through the wet cyclone may be represented by the formula (4·2).抄録全体を表示PDF形式でダウンロード (869K) -
林 大輔1958 年 74 巻 838 号 p. 243-248
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーIn the case of the machine with the feed pipe above the impeller like this, inhaling of, the open air through the feed pipe is quite easy while when the blew quantity of the air through the stand pipe exceeds the limit, it has the characteristic to have the surplus quantity of the air shoot out to the opposite direction of the pulp flow from the feed pipe.
The author, by way of measuring the inhaled quantity of the air through the feed pipe and stand pipe respectively, acquired distinct interrelations of them and fixed the critical depth of the pulp at the time when the inhaling of the air was ceased, and thus testified that when the location of the feed pipe is shifted to the cell bottom it allows the stand pipe to blow in a large amount of the air voluntarily without inhaling through the feed pipe, and consequently the action of the impeller has become simplified to be effective in the saving of the power.抄録全体を表示PDF形式でダウンロード (1196K) -
浅野 楢一郎, 野島 静雄1958 年 74 巻 838 号 p. 249-252
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーSulfur dioxde produced by the reaction between copper matte and magnetite, which was melted in a silica crucible passing a current of nitrogen, was measured continuously, and the composition of the quenched matte was determined.
Magnetite saturated in copper matte is reduced violently and its content is decreased to the solubility curve, but when magnetite is unsaturated in copper matte, it is difficult to reduce. From thee results, some considerations were given on the reduction of magnetite in copper smelting.抄録全体を表示PDF形式でダウンロード (587K) -
天沼 〓, 加藤 清二1958 年 74 巻 838 号 p. 253-256
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーWe studied the reducibilities of zinc compounds, such as ZnAl2O4and ZnS and of copper slag at Naoshima Smelter underCOatmosphere. These samples and carbon powder were mixed with or without CaCO3. ZnAl2O4was stable and reduced only 30% at 1050°C. ZnS was reduced 90% when mixed with CaCO3, but only 20% without CaCO3, but. only 20% without CaCO3 at 900°C. The reducibility of zinc in Cu-slag was nearly as same that of Pb-slag and ZnFeSiO4. We also studied the decomposition of Zn-ferrite when heated with CaCO3and the prevention of formation of Zn-ferrite from mixture of ZnO, Fe2O3and CaCO3. In both cases, free ZnO was leached 60-70% from the samples heated at 1100°C.抄録全体を表示PDF形式でダウンロード (2166K) -
三野 英彦1958 年 74 巻 838 号 p. 258-264
発行日: 1958/04/25
公開日: 2011/07/13
ジャーナル フリーPDF形式でダウンロード (5402K)
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