Vol 108

At mining enterprises, in agriculture, in clearing construction sites perform a significant amount of work on loading large pieces of stone, which are rectangular blocks of marble, granite, travertine, etc., boulders, the shape of which is close to a ball, oversize in mining, the shape of which can be arbitrarily.

The equations of motion of the drive of the executive body of the combine harvester GPC taking into account the oscillatory properties of the transmission of the gear reducer of the cutting part for the case of the crown movement from top to bottom have the form...

In the practice of designing gears more and more attention is paid to modern methods of estimation of qualitative characteristics of meshing. The automation of complex calculations of geometry, kinematics and especially labor-intensive calculations of the strength of gear pairs is becoming widespread.

When a combine harvester operates at a rational cutting speed, maximum productivity is ensured at given values of resource and safety indicators. These conditions will be met if the optimum thickness of the "chip" is provided, which determines the ratio of the dynamic component of the load and friction power.

In recent years, the Leningrad Mining Institute has developed several stands for post-repair tests of drives of loading machines, cleaning and sinking combines in the conditions of production associations "Leningradslanets", "Kuzbassugol" and "Vorkutaugol".

Coefficient of efficiency of gear transmission determines the degree of energy perfection of motion conversion by the mechanism. Energy losses in gears arise as a result of friction between the teeth during their relative movement, friction in shaft supports, in seals, as well as when mixing oil in the gear case and squeezing it out of the depressions between the teeth.

The problem of wedge penetration into a deformable obstacle has been solved by many researchers in relation to the work of drilling machines, string plants, mining combines and other similar equipment, i.e. for conditions when the wedge at its tip experiences more resistance when penetrating into the rock to be destroyed.

Reduction of contamination of belts and sub-conveyor space by transported cargo is achieved by application of preventive means reducing adhesion of adhesives of transported cargo to the belt; cleaning of conveyor belts, which allowed to reduce the number of adhesives on the working surface of the belt and, accordingly, the volume of sludge under the conveyor; double reversal of the belt on the idle branch, reducing the total volume of sludge in the sub-conveyor space and limiting the zone of contamination of the latter to areas in the head and tail parts of the conveyor; manual cleaning of conveyor belts, which allowed to reduce the number of adhesives on the working surface of the belt and, accordingly, the volume of sludge under the conveyor.

Designed and manufactured in the institute "Giproninemetallorud" stone processing machine is designed for mechanized processing of blocks (curb, cover and facing slabs, steps, etc.) of high-strength stone, such as granite, thermal and gas-dynamic tool.

Out of a large number of works on the study of the dynamics of shearers, a significant part is devoted to the study of mathematical models of the shearer, in which the dynamic system under consideration is represented by a linear oscillating system with several degrees of freedom, and the action of the face on the drive of the shearer by some moment containing constant and variable components.

The sensor is designed for continuous measurement with increased accuracy and subsequent registration of small linear velocities and accelerations of the combine harvester movements. The device is built into the housing of a typical sensor UPDS.

The characteristic of serviceability of machine elements should take into account the serviceability resource under different modes of operation of a part, material, device or connection. As a single characteristic of serviceability it is advisable to take the curve of resource development at different modes of operation.

Drilling equipment with pneumatic drill heads is the most widespread in the mining industry. When selecting rational drilling regions in specific mining conditions, it is necessary, along with other parameters, to control the amount of compressed air consumption.

To date in the non-metalliferous industry there is no scientifically substantiated list of design deficiencies of process equipment from the point of view of safety. Insufficiently studied the degree of danger of individual units and mechanisms, the influence of individual factors on the level of injury hazard and on the severity of injuries, as well as on the effectiveness of various methods and technical means of ensuring the safety of equipment.

In 1981-1983, the industry laboratory of mechanization of labor-intensive work at mining enterprises LMI surveyed the operating conditions and modes of operation of production equipment from the point of view of safety at five basic enterprises of the non-metallic industry, representing mica, vermiculite and feldspar industry.

The main purpose of the calculation is to determine the power consumed by the drive during machine operation. Calculation is part of the complex of calculations performed in the design of the flotation machine, and it is performed first of all.

One of the modern directions of improvement of products, increasing serviceability and durability are strengthening methods at the stage of production and repair of machines, i.e. technological.

Increasing the durability of wear parts of equipment is an urgent task of all sectors of the economy. The problem is especially important for mining machines due to the operating conditions causing intensive destruction (wear, fractures, deformations) of parts replaced or restored during the repair of equipment.

The study of the stress-strain state of the molding mixture during compaction is the basis for the development of engineering methods for calculating rational technological parameters of the molding process, optimizing the parameters of molding machines and tooling, improving the quality of castings.

Currently, the industrial development of the ocean is actively developing and one of the main directions of work on the study of its resources is the extraction of minerals. For the extraction of minerals on the shelf a complex of machines and apparatuses has been created, which includes dredgers, underwater bulldozers of "Komatsu" type, robots "Nihon" and "Komatsu", RUM apparatus, "Hitachi" system, various walking rigs developed and tested in the Soviet Union.

Gears with combined (radial and tangential) offsets of involute tooth profiles have great possibilities to meet the strength and geometric-kinematic requirements of.

The Polish coal industry, one of the major suppliers of hard coal in the world, is successfully developing the complex mechanization of coal excavation and preparation, as well as the production of mining machinery and equipment on the basis of designs and licenses developed in the country.

In the mining of mineral deposits occurring at great depths, widespread in the USSR and abroad have been highly productive compact multi-rope lifting units with a friction pulley.