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Date submitted1990-09-18
-
Date accepted1990-11-10
-
Date published1991-04-11
Working of a centrifugal pump
- Authors:
- B. S. Makhovikov
- Guo Zhen Ning
General considerations about the basic physical phenomena occurring during the transfer of mechanical energy from the impeller to the fluid flow in a centrifugal pump are quite clearly reflected in the derivation of the basic equation of turbomachines.
-
Date submitted1990-09-26
-
Date accepted1990-11-12
-
Date published1991-04-11
About application of L.Euler's equation to pumps
- Authors:
- S. S. Smorodin
In the theory of turbomachines fundamental is the question of determining the expended work on the wheel as a form of energy exchange of fluid with the body.
-
Date submitted1990-09-15
-
Date accepted1990-11-27
-
Date published1991-04-11
Investigation of the automated hydraulic drive of the roller cone drilling machines
In modern drilling machines for the drive of rotary-feeding mechanisms are increasingly common volumetric hydraulic drives.
-
Date submitted1990-09-26
-
Date accepted1990-11-08
-
Date published1991-04-11
Resistance of a layer of deposits on a wall at destruction by a water jet
- Authors:
- K. G. Asatur
- I. I. Doroshenko
- V. V. Shilov
In the study of stresses in sediments, a thin layer on a metal wall is treated as an elastic medium lying on a perfectly rigid base.
-
Date submitted1990-09-23
-
Date accepted1990-11-21
-
Date published1991-04-11
Multi-channel elevators for vertical passenger elevators of subways
- Authors:
- V. A. Kabanov
The existing escalator elevators in subways cannot cope with the constantly increasing passenger flows, especially acute is the issue of passenger transportation during rush hours.
-
Date submitted1990-09-09
-
Date accepted1990-11-18
-
Date published1991-04-11
Development of researches on application of high-pressure water jet
- Authors:
- Cheng Da Jun
In the world practice of development of mining science the problem of research and application of high-pressure water jet was first studied by the Leningrad Mining Institute, IGD AS USSR, VNIIGidgougol, Siberian Research Institute for Hydrodynamics Mining Bureau (USA).
-
Date submitted1990-09-03
-
Date accepted1990-11-28
-
Date published1991-04-11
Cavitation tests of the vibrating suction system of hydraulic drive
- Authors:
- G. D. Slabozhanin
Increased vibration on mining and construction machines in a number of cases causes cavitation phenomena in the hydraulic systems of drives and, as a consequence, an increase in head losses, reduction of pump delivery, productivity and reliability of machines.
-
Date submitted1990-09-20
-
Date accepted1990-11-25
-
Date published1991-04-11
Improvement of algorithm of calculation of compressor unit network characteristic
- Authors:
- V. V. Klassen
The developed algorithm of calculation of the compressor unit network characteristic has a number of disadvantages: impossibility of calculation of the pneumatic network with ring pipelines; absence of protection against wrong choice of the most loaded direction of air supply and the most remote consumer in it at drawing up the calculation scheme of the pneumatic network; necessity of input of the pipeline diameter by an arbitrary number at the length equal to zero, arising at the equivalent transformation of the pneumatic network; repetition of a number of operators, making the pneumatic network equivalent to zero.
-
Date submitted1990-09-29
-
Date accepted1990-11-12
-
Date published1991-04-11
Hydraulically driven direct acting drilling pump
- Authors:
- A. S. Davydov
When drilling wells for various purposes, one of the main energy-consuming units of the drilling unit is the drilling pump.
-
Date submitted1990-09-24
-
Date accepted1990-11-13
-
Date published1991-04-11
Influence of fracture step on specific energy consumption of the process of mechanohydraulic tool interaction with rocks
The fracture step t (the distance between neighboring penetrations) is the main factor determining the process of interaction of the mechanohydraulic tool with the rock mass ...
-
Date submitted1990-09-04
-
Date accepted1990-11-30
-
Date published1991-04-11
On the influence of the averaged velocity distribution function on the hydraulic characteristics of the flow
- Authors:
- Yu. N. Gulyaev
The main task of practical hydrodynamics is a quantitative assessment of head losses on overcoming hydraulic resistance, determining the reliability of hydraulic calculations for the design of hydraulic systems.
-
Date submitted1990-09-07
-
Date accepted1990-11-19
-
Date published1991-04-11
О влиянии функции распределения осреднений скорости на гидравлические характеристики потока
- Authors:
- Yu. N. Gulyaev
Основной задачей практической гидродинамики является количественная оценка потерь напора на преодоление гидравлических сопротивлений, определяющая надежность гидравлических расчетов при проектировании гидросистем ...
-
Date submitted1990-09-24
-
Date accepted1990-11-04
-
Date published1991-04-11
Issues of improvement of designs and operation of regulated pumps
- Authors:
- A. B. Nezametdinov
- A. N. Frakman
Among the positive displacement pumps diaphragm pumps are distinguished by the fact that they have no rubbing metal pairs and face clearance tolerances, and the designs are simple and unpretentious, especially when pumping contaminated liquids and hydraulic mixtures.
-
Date submitted1990-09-09
-
Date accepted1990-11-25
-
Date published1991-04-11
Application of electrochemical method for control of organosaline deposits in the hydraulic transportation system
- Authors:
- A. S. Medvedev
- M. M. Kryzhanovsky
The modern development of the national economy is associated with an increase in the processing of non-ferrous and ferrous metals, mining and metallurgical raw materials and construction materials at mining and metallurgical plants.
-
Date submitted1990-09-01
-
Date accepted1990-11-20
-
Date published1991-04-11
Integral characteristics of sulfur-water mixture during flow in fracture fracture
- Authors:
- E. V. Sergeev
- A. S. Maksimov
One of the main tasks arising in the development of the technology of area upward sulfur smelting is the study of integral characteristics of the flow (critical velocities and specific head losses) of the sulfur-water mixture during its movement in the permeable zone, which is the main transport link of the technological scheme.
-
Date submitted1990-09-08
-
Date accepted1990-11-26
-
Date published1991-04-11
Frictional auto oscillations of dual mass braking devices
- Authors:
- M. M. Vetyukov
- R. F. Nagaev
- M. Yu. Platovskikh
The paper deals with the dynamics of braking devices, which may include, friction braking mechanism, clutch mechanism at the slip stage and some other.
-
Date submitted1990-09-07
-
Date accepted1990-11-07
-
Date published1991-04-11
Stand for research of pneumatic tires performance characteristics
- Authors:
- V. Yu. Koptev
In order to improve the efficiency of heavy-duty quarry vehicles, the improvement of the design and increase the service life of oversize tires (UHTS) is of great importance.
-
Date submitted1990-09-11
-
Date accepted1990-11-18
-
Date published1991-04-11
Research of thermal load of 33.00-51 tires in conditions of Kostomuksha mining and processing plant
- Authors:
- S. V. Medvedev
The service life of oversize tires has a great influence on the efficiency of operation of dump trucks with carrying capacity of 110-180 tons, as their cost reaches 20% of the dump truck cost, and their share in the cost of transportation is 25-30%.
-
Date submitted1990-09-02
-
Date accepted1990-11-10
-
Date published1991-04-11
Protection of highways from snow avalanches at the highland quarries
- Authors:
- R. A. Gevorgyan
Practice shows that the impact of climate rigidity on the operation of dump trucks at high-mountainous open pits is most often manifested in the fall and winter time due to low air temperatures, heavy snowfalls and fog.
-
Date submitted1990-09-09
-
Date accepted1990-11-23
-
Date published1991-04-11
Experimental researches of parameters of dump trucks movement on coal pits of Vietnam
- Authors:
- Fan Xuan Bin
At present, powerful machines BelAZ-540 and BelAZ-548 are practically introduced at coal pits of Vietnam.
-
Date submitted1990-09-08
-
Date accepted1990-11-24
-
Date published1991-04-11
To the question of mathematical modeling of dump trucks movement
- Authors:
- Purevtogtokh Baldangiin
One of the main tasks in the calculation of quarry road transport is to determine the speeds of dump trucks on the route.
-
Date submitted1990-09-10
-
Date accepted1990-11-22
-
Date published1991-04-11
Strength calculations of large-module spur gears
- Authors:
- I. P. Ivanov
Large-module gears are widely used in heavy and transport engineering, in mining, construction and road machines, in apparatus of chemical industry.
-
Date submitted1990-09-28
-
Date accepted1990-11-05
-
Date published1991-04-11
Method of estimation of mining machines operation quality
- Authors:
- M. D. Kolomiytsov
Operation of mining machines at mines and surface mines according to the existing regulations involves the following operations: machine acceptance at the factory, transportation to the face, installation, maintenance, use of machines in the face for their intended purpose, current and major repairs, dismantling.
-
Date submitted1990-09-18
-
Date accepted1990-11-22
-
Date published1991-04-11
Method of selecting the rational mode of operation of combine harvester actuators
- Authors:
- A. M. Meshkov
The main types of machines used for tunneling works in the construction of the Leningrad Metro, destroying rock by cutting: tunneling machine KT1-5,6 with a rotary actuator, machine AMSH with a screw actuator and tunneling boom with a crown actuator (types GPC, PK-ER, 4PU).
-
Date submitted1990-09-06
-
Date accepted1990-11-02
-
Date published1991-04-11
Analysis of electromechanical and electrohydraulic drives of mining machine actuators
- Authors:
- Yu. V. Lykov
At present on mining machines, in particular combines, is widely used unregulated asynchronous electric drive of the executive body with a rigid mechanical characteristic in combination with adjustable volumetric hydraulic drive of the feed mechanism.
-
Date submitted1990-09-03
-
Date accepted1990-11-03
-
Date published1991-04-11
Analysis of AMK unit operation at Lenmetrostroy mines
- Authors:
- A. A. Khalilov
When conducting the stations of the Leningrad Metro, the tunnels are conducted first, then the calotte slot (the upper part of the station vault with a height of 3.5 m), and the main part of the station is developed with the help of excavators of the "Gidravlik" type and boom tunneling machines.
-
Date submitted1990-09-30
-
Date accepted1990-11-11
-
Date published1991-04-11
Load-carrying device for natural stone blocks
- Authors:
- G. V. Sokolov
- Yu. S. Fedorov
In the branches of the boom construction industry of the country in the extraction and processing of natural stone, one of the factors restraining the increase in productivity and labor efficiency is the practical complete absence of mechanisms and devices for loading and unloading operations.
-
Date submitted1990-09-18
-
Date accepted1990-11-15
-
Date published1991-04-11
Quantitative safety assessment of crushers at the design stage
- Authors:
- V. V. Denegin
- A. I. Talko
- Yu. R. Marusov
Due to the involvement of poorer ores in production, the capacity and share of beneficiation equipment in the industry is constantly increasing, and issues of its safety are becoming increasingly important.
-
Date submitted1990-09-02
-
Date accepted1990-11-11
-
Date published1991-04-11
Books of 17th-18th centuries on mechanics in mining in the main library of LMI
- Authors:
- V. G. Bauman
The extraction of minerals, especially metal ores, from ancient times has been associated with a number of labor-intensive processes, such as dredging, raising the fossil to the surface, and since the middle of the 17th century, the ventilation of mines.