Vol 54 Iss. 1

February 23, 1966 at the 77th year of life died one of the oldest professors of the Leningrad Mining Institute, Honored Worker of Science and Technology, Professor, Doctor of Technical Sciences Vladimir I. Gerontiev ...

In 1964-1965 at the mine No. 3 of Slantsy Combine the resistance of layers of the industrial oil shale stack to mechanical destruction was determined. Resistance (strength) was determined in three ways: 1) by the method of pushing with the help of the POC device (strength coefficient f); 2) by the method of cutting from the open face with the help of the DKS-3 device (strength index A); 3) by the energy indicators of the Ural-33 cutting machine (strength index Avr)....

Long-term practice of deep ore dumps shows that in their operation there are significant difficulties, especially in the harsh climatic conditions of the Arctic Circle ...

During the research of the hydrofilling complex operation mode, a radioisotope density meter PZHR-2M with the measuring range of 0.5 g/cm3 was used to measure the density of the hydraulic mixture. This range in some cases did not meet the conditions of the hydrofill complex operation. Often the mixing device could not provide complete filling of the pipeline. Then air moved along the pipeline with the pulp, and the device showed the density value less than one. For correct evaluation of the work of the stowing complex it was necessary to know the character of pulp movement with incomplete utilization of its cross-section. For this purpose the measuring limits of the instrument were extended by means of lead tared plates placed between the source unit and the pipeline. By changing the thickness and number of plates, it was possible to have several measurement ranges: 0-0.5; 0.5-1.0; 1.0-1.5 g/cm3 ...

To conduct experiments to study the process of flow of bulk material from the chambers of the hydraulic feeder in the laboratory of the Department of Mechanization of Mining Operations LGI was mounted experimental installation, which is a single-section chamber feeder ...

The tests were carried out in 1965 to determine the efficiency of destruction of layers of industrial oil shale stack by the executive body of the combine, which is a milling-type rebound crown. The rotation speed of the crown is 58 r/min from the electric motor KOF-22-4k (25 kW). Rotation of the crown in the vertical, horizontal planes and feed back and forth (0,5 m) are carried out by hydraulic cylinders. Two hydraulic jacks provide the harvester's support between the roof and the soil. The hydraulic jack pumps are driven by the second electric motor KOF-22-4k. Thus, the total installed power of the motors for rotation and feeding of the crown is 50 kW ...

One of the progressive directions in the development of mechanization and automation of mine transport is the complete conveyorization of transport from the loading face to the bunkers on the surface. However, it is difficult to carry out complete conveyorization, because for one link of the transport scheme - along vertical shafts - has not yet developed a sufficiently economic and reliable method of conveyor transport ...

At Slantsy plant in 1965 there was carried out an experimental notching on the upper part of the limestone “slab” layer, where there is a 0,04 m thick interlayer of clay shale with lower strength. At the total height of the cutting slot of 115-120 mm, the destroyed part of the limestone was 75-80 mm, and 40 mm were in the clay shale interlayer. The cutting was made by the Ural-33 cutting machine mounted on skids above the scraper conveyor, with a bar length of 2 g and an unauthorized seven-line chain. The useful depth of the cut was 1.7 m. The machine was operated at a reduced cutting speed (1.6 m/sec) with I-80 cutters, whose back angle was increased from 5 to 15°.

At present the industry of the Soviet Union mass-produces only Ural-33 type punching machines, which are used in those mines, where it is impossible to use harvesters. With the existing technology of oil shale mining, the undercutting is made at the bed soil (on the third layer of oil shale) by the machine “Ural-33” with a two-meter bar, with a useful furrow of 1.9 m ...

The research was carried out by oscillographic method using oscilloscope H-102 and pressure sensors of DM type. Analysis of the research materials showed the following ...

One of the most important parts of the mine jet parachute is the mechanism for opening the outlet of the compressed gas chamber to release the expelling jet at the moment of parachute device activation ...

One of the urgent issues of operation of belt conveyor lines of the mining industry is the improvement of existing and finding new ways of cleaning conveyor belts ...

Widespread use of conveyor transportation in some cases is limited by the shortcomings of traction and load-carrying bodies of existing types of conveyors. Belt conveyors with rubberized fabric (cotton and synthetic) belt have a relatively small length per drive and short belt life. The disadvantage of belt conveyors with rubber tether belt is the high cost of the belt and its repair (amortization of the cost of the belt is up to 50% of the total cost of transportation). Belt-and-channel conveyors have a complex belt design and, accordingly, its cost is high. Belt-chain, slat and scraper conveyors have a small length per drive, low strength and very high weight of the traction body ...

Development of design capacities of apatite mines Rasvumchorr-Circus and Tsentralny causes rapid growth of cargo turnover. In this regard, the maximum use of fixed assets of transport Apatit Combine and, first of all, locomotive and wagon fleet is of great importance ...

The existing technology of oil shale extraction provides for simultaneous extraction of the entire industrial oil shale stack. This provides the fastest and least labor-intensive destruction of oil shale and allows for mechanized loading in chambers - longwall faces in the case of bulk excavation. However, this method leads to mixing of oil shale and rock, and manual sampling in longwall faces is very labor-intensive and unpromising in terms of increasing labor productivity ...

The study of the physical essence of abrasive wear of pipes during hydraulic transportation of multifractional slurries makes it possible to solve one of the topical issues of this process - their durability and reliability. Recently this question has aroused great interest of researchers. The intensity and nature of hydro-abrasive wear of pipes determine the parameters justifying the mode of transportation of hydraulic mixture in pipelines; physical and mechanical properties of the transported slurry; physical and mechanical properties of the pipe material; chemical and mechanical properties of the carrier fluid ...

Stringer, which is the executive body of the string plant, is usually used on the declining coal seams (0-20°) with a thickness of 0,9-1,8 m with soft and medium hard coal. The stringline operates according to the shallow scheme, moving along the face at a speed of 33.6 m/min and higher. On the body of the screed are mounted soil advance and lower knives and cutters, which work in conditions of blocked and semi-blocked cutting ...

Compressed air power is widely used in the mining industry. It is relatively safe, and its application is associated with structurally simple, productive and durable drilling machines ...

Improvement of drilling operations and reduction of their costs is one of the urgent tasks of the Estonian oil shale deposit. The volume of overburden limestone drilling for the quarries of the Estonian Oil Shale Trust amounted to 501 600 m of 115 mm diameter blast holes in 1964. With the commissioning of new quarries the drilling volume will increase to 1.2 million meters per year ...

Parameters of the short-circuited electric motor for the drive of the running gear and design parameters of mine self-propelled cars on pneumatic wheels are in the following dependence ...

In the present article the basic laws of operation of viroploading machine type 2PNV-1, the design of which is developed by Gipronickel.The working body of the machine is a vibroloading chute. The impact of the vibro tray, embedded in the stack of rock, causes vibrofluidity in it, as a result of which the rock enters the tray and moves up to the transfer conveyor ...

Development of diamond deposits in Yakutia and production of synthetic diamonds attract the attention of specialists to the possibility of wider application of diamond bits for drilling exploration and production and explosive boreholes, especially in very hard rocks ...

The introduction of coal combines in the development of steeply falling seams is accompanied by a transition from the ceiling-type bottom face to a rectilinear one. More advanced method of coal mining and new technology of coal mining in comparison with the hammer excavation created favorable conditions for increasing the load on the face and increasing productivity ...

Hydrotransort systems with feeders are widely used both in the USSR and abroad. The most expedient are chamber feeders. Their construction cost, operation, simplicity of construction and reliability are basically satisfactory ...

Application of computer technology is one of the ways to improve the operational management of railway transport at powerful coal mines with a large number of mining equipment and a developed network of railway tracks. Preliminary determination of the effectiveness of new methods of management is best to produce modeling the work of the mines. At the same time, an idea of the effectiveness of new methods and systems of operational management is given by comparing the results of modeling and the results of actual operation of the mine. In this paper we consider the essence of modeling by the method of actual shifts, its positive and negative properties and the scope of application ...

The idea of a jet parachute, the braking force of which is created by the reaction of a gas jet flowing through one or more nozzles from a chamber containing a certain amount of compressed gas, was proposed by A. P. Herman. P. Herman. However, despite a number of undoubted advantages of this system over the known systems of mine parachutes it was not theoretically justified and applied in practice ...

Engine power of the working bodies of loading machines of all types is determined approximated due to the diversity of loading conditions, properties of the loaded mass, the type of the working body, producing loading, etc. ....

One of the ways to develop and improve loading mechanisms is to identify and introduce into practice the most rational form and kinematics of the working bodies of existing loading machines. However, the desire to intensify work causes the search for other ways to increase the efficiency of loading mechanisms ...

From the design of guide lifting vessels for vertical shafts of mines depends primarily on the value of the dynamic load of interaction with the conductors. Therefore, the correct choice of the main design parameters of the guides is conditioned by the normal operation of the entire lift. This is especially important nowadays, when the capacity of lifting vessels, shaft depths and speeds of movement along them have increased sharply ...

At transportation of a cargo by belt conveyors at the moment of passing of roller supports the cargo can separate from a belt at speed of movement of a belt ...

Studies of friction-pulsating feed mechanism (in KMP-2 cutting machine) and hydraulic mechanism of volumetric type (in Ural-33 cutting machine) with rigid mechanical characteristics have shown that the feed speed at work in the face changes unevenly. This is explained by the unevenness of the process of destruction of the mineral, as well as the presence of a flexible rope in the feed drive ...

This paper presents an original method of constructing the motion curves of a mine electric mine haulage system adapted to motion resistances varying linearly as a function of velocity. Such a dependence of motion resistances is based on experimental studies in coal mines of Poland. The research and measurements were carried out by the Department of Mining Electrical Engineering of the Krakow Mining and Metallurgical Academy ...