Torque controlled safety couplings are used as safety elements in drive trains. Their function consists in separating input side and output side when the limit for the transferrable torque is exceeded. Main property of these couplings is the switching torque, the maximum transferrable torque before initiating the separation of the drive train. Target of the project is to examine the characteristics of the switching torque of form fitting safety couplings. Doing so three couplings of well known manufacturers are examined. Main result of the test is that the switching torque of form fitting safety couplings is underlying parameter dependencies and scatter. Safety and exploitation of the drive train are in cases considerably depended on the given point of operation and the coupling adjustment. In this respect it is of importance, to choose, to adjust and to operate the covered couplings systematically.
There are three fundamental basic documents in energy conservation and energy efficiency today: the Energy Strategy in the period up to 2030; the Federal Law «On energy-saving and energy efficiency and in amending particular legislative acts of the Russian Federation»; and the State Energy Conservation and Energy Efficiency Program in the period up to 2020. In recent years, the upward trend in the use of renewable energy sources (RES) is becoming all the more evident. Until recently, the development of energy has seen a clear pattern: the areas of energy which have developed most are those which have a quite fast direct economic effect. The social and environmental impacts associated with these areas were considered only as incidental, and their role in decision-making was negligible. With this approach, we considered RES only as a future energy source, when traditional energy sources have been exhausted, or when obtaining them becomes extremely expensive and timeconsuming. The primary driver behind the intensive development of RES has been public pressure based on environmental concerns, rather than economic calculations about the future. The economic potential of the world’s renewable energy is currently estimated at 20 billion tons of oil equivalent per year, which is twice the annual output of all fossil fuels. This fact shows us the path of energy development in the near future. In this paper, on the basis of the laws of the Russian Federation, renewable energy in the coal industry is considered. We describe the experience and prospects of the use of mine water and burning rock dumps.
Power characteristics of career dump trucks are defined on the one hand by thermodynamic characteristics of impellent installation of the car (diesel engine), and with another technological working conditions of a dump truck in career (length of transportation, a profile of the line, overcome biases, etc.). Optimum value of power characteristics of dump trucks can be provided at relative equality of effective power of the engine of a dump truck and capacity of mountain weight spent for transportation. To the basic criteria of power efficiency in piper are accepted specific fuel consumption of diesel of a dump truck and specific power consumption of transport works.
In paper the question organization of service and diagnosing for the pumps applied in hydrotransport systems of mineral materials is considered. Variants of technical condition control of the equipment by various methods including methods of nondestructive control and methods of parametrical diagnostics, including with use of the experience which has been saved up in gas branch at Compressors diagnostics on Compressors Station are offered.
The article contains results the study of the basic properties of fluorinated polymers used as matrix in the manufacture of magnetically active elastomers (MAE). MAE belong to the group of so-called smart materials, they can be used in the creation of new techniques and technologies. Environments, which is in contact with an element of the MAE, specifically high viscosity asphaltenic oil impose substantial restrictions on the choice of the polymer matrix for its production, taking into consideration the influence of the material selected to modify the rheological properties of the resultant material. The use of magnetically active materials in the system instead of a roller system, pressing on the tube with the substance, and to push it forward will significantly expand the range of application of such equipment. Additionally, the magnetic treatment reduces the viscosity, the limit shear stress and the activation energy of the viscous flow of oil.
Is resulted in the article review basic designs loading parts of mining machines, analysis of physical processes of occurring at loading of rock massive is leaded with gathering-arm, basic directions of perfection of cutting heads with coupled gathering-arm are considered, and also is offered it is basic new variant of constructive execution of executive body of нагребать part for creation gathering-arm of conation.
In article possibility of performance improvement of a gathering-arm loader at the expense of adjustment of the kinematic circuit oscillating crank mechanism a method of synthesis of a path of driving of the leading edge of a gathering arm on the given conditions of processes of implementation, capture and bulk cargo transportation is considered.
The article deals with the problem aimed at solving the fundamental problems of developing effective methods and tools for designing, controlling and managing the stream of fluid flowing in variable-section pipelines intended for the production of pumping equipment, medical devices and used in such areas of industry as mining, chemical, food production, etc. Execution of simulation modelling of flow motion according to the scheme of twisted paddle static mixer allows to estimate the efficiency of mixing by calculating the trajectory and velocities of the suspended particles going through the mixer, and also to estimate the pressure drop on the hydraulic flow resistance. The model examines the mixing of solids dissolved in a liquid at room temperature. To visualize the process of distributing the mixture particles over the cross-section and analyzing the mixing efficiency, the Poincaréplot module of the COMSOL Multiphysics software environment was used. For the first time, a multi-physical stream of heterogeneous flow model has been developed that describes in detail the physical state of the fluid at all points of the considered section at the initial time, takes into account the design parameters of the channel (orientation, dimensions, material, etc.), specifies the laws of variation of the parameters at the boundaries of the calculated section in conditions of the wave change in the internal section of the working chamber-channel of the inductive peristaltic pumping unit under the influence of the energy of the magnetic field.
The object of study is the system of hydrotransport of iron ore processing tailings at JSC «EVRAZ Kachkanarsky GOK». The aim of the work was to determine the parameters of the hydraulic transport of tailings of the iron ore enrichment at weight concentrations of the solid phase from 30 to 70 % and to develop recommendations for the industrial operation of hydraulic transport systems of highly concentrated slurries of the Tailing Facilities of the Kachkanarsky GOK. Laboratory studies of the parameters of hydrotransport of thickened tail pulps were carried out with the development of a calculation method; pilot tests of the hydrotransport system under the conditions of the Tailing Facilities of the Kachkanarsky GOK. It has been established that using polyurethane coatings on the inner surface of the slurry lines significantly (1.75 times) decrease the specific pressure loss on the hydrotransport of thickened fluids. This allows to significantly increase the range of transportation for placing tailings in the distant parts of the storage zone. The introduction of research results is in the project of reconstruction and development of the tailing facility of the TF of the Kachkanarsky GOK for the period 2018-2020. It is proposed to use the results of work in the project of reconstruction of the hydraulic transport system at the TF of the Kachkanarsky GOK by switching to the hydraulic transport of slurries thickened to weight concentrations of 35-40 % in the slurry pipes with an internal polyurethane coating, which will ensure energy saving in the hydraulic transport process.