Vol 97

When studying the modes of operation of mine pneumatic networks it is advisable to measure the parameters of compressed air: flow rate, pressure, temperature - simultaneously at different points of the pneumatic network, combining measurements with the recording of parameters within a certain period of time.

For hydrodemolition of coal underground method, in addition to stationary jets are used pulse and pulsating ones.

The question of sufficient conditions supplementing the necessary general criterion conditions of similarity in hydrodynamic problems is equivalent to the question of the uniqueness of the solution of the system of basic equations.

In the reference literature on hydraulic drives the speed of propagation of a shock wave in metal pipes with working fluid is recommended to be tentatively taken equal to c = 1000-1330 m/s...

On installations for hydroremoval from the walls of pipes sediments having different chemical composition, hardness according to Mohs and uniaxial compression strength were conducted studies to determine the performance of specific energy intensity and speed of movement of the jet.

In open thermodynamic systems, there is thermal and mechanical interaction of the working body with the environment and transfer of the working body through the control surface of the system.

In practice, two main methods of mechanized charging of wells are known: from the wellhead and from the bottom hole. With increasing depth of development at quarries the number of watered wells is increasing, which significantly changes the technology of charging wells with hot pouring water-filled explosives (HLWFE).

The tasks related to the research of the mechanohydraulic method of rock destruction have been discussed in several domestic and foreign articles and in reports at international symposia on jet cutting technology.

In the theory and practice of engineering calculations, in particular in the calculations of mine hoisting installations, the concept of reduced. mass of moving parts.

At the shaft No. I of Borislav ozokerite ore management (BORU) since 1946 is operated mine hoisting machine with two drums with a diameter of 4.5 m and width of 1.4 m.

Many researches are devoted to the questions of rational design of mine fan installations. To ensure the selection of the most advantageous fan in the design of mine ventilation of primary importance is the prediction of operating modes of the main fan for the entire life of its operation.

The development of open pit mining is inextricably linked to the intensification of mining production and increasing the depth of open pit mining. Intensification of mining production usually leads to an increase in the exchange of harmful substances in the form of dust and gases that pollute the air in open pits.

Construction and operation of underground structures are always associated with the use of lifting machines. The most widespread at modern enterprises are machines with friction pulley.

Recently, the hydraulic transport of fine materials at a distance of tens, hundreds, and sometimes thousands of kilometers is becoming increasingly common.

One of the options for hydraulic transportation of bulk materials in difficult mining conditions are cascade devices that allow to feed the pulp from a great height.

The research was carried out in the conditions of Zhdanovsky mine of Pechenganickel Combine. The object of research is a dump truck BelAZ-549 with payload capacity of 75 tons with a diesel engine 8RACH-185 with a capacity of 882 kW.

In recent years in countries with developed mining industry (USSR, USA, FRG, Japan, Czechoslovakia) intensively conducted work on the creation and implementation of multi-drive belt conveyors (MDBC), allowing to transport bulk goods over significant distances without overloading.

The process of cleaning of conveyor belts, i.e. removal from the surface of the belt (substrate) of admixture of the transported cargo, is accompanied by overcoming the forces of adhesive interaction between the contaminating belt layer and the surface of the belt itself.

Coal mining in all basins of the country is provided mainly by mechanized complexes with narrow-capture harvesters. In many lions their productivity reaches 1000 tons and more of coal per day.

Reliability and efficiency of shearers depends largely on the loads during operation. Knowledge of loads is necessary for estimation of resource of productivity of combines, development of corresponding typical equivalent loads and modes at bench tests of shearers.

Further growth of labor productivity in the mining industry at the modern level of mechanization of mining and tunneling works can be ensured by increasing the reliability and durability of machines ways to improve the drives of their executive bodies.

In the last decade more than 20 foreign firms have started serial production of self-propelled drilling rigs with hydroperforators, which are used both in the sinking of mine workings, and on cleaning works.

Mathematical models of the drive of rotary feed mechanisms (RPM) of roller cone drilling machines, necessary for the selection of operational modes of control of drilling processes and design of systems of automatic regulation of its parameters, are poorly studied.

The conducted studies show that the torque of perforators is created by impulse shock loads, the maximum value of which reaches a significant.

The problem of reducing the consumption of compressed air has become particularly relevant in recent years, when the issue of saving energy resources, in accordance with the decisions of the XXVI Congress of the CPSU, came to the forefront

The use of gear pairs with combined displacement of tooth profiles opens up new geometric, kinematic and strength possibilities in the design of gears.