The effect of local changes in the surface hardness of the end surfaces of teeth of coarse-grained gear transmissions mining machines. Represented by patterns of change of the surface hardness is not the type of reference to the loading. The estimation of the value of destruction of samples. Proposed to assess the remaining amount of coarse-grained gears with consideration of changes in the local surface hardness developed technique.
To date, there is need to review the existing rigid system of preventive maintenance and the transition to a more progressive system, which provides maintenance and repairs on its actual state, in which the need for repair work is based on a preliminary examination and the results of the diagnosis and monitoring of major nodes excavator. Pays special attention to the concept of TPM (Total Productivity Maintenance) for the maintenance of mining excavators.
In article the review of methods of a theoretical estimation of a resource of elements of cars is presented. Perspectivity of the thermodynamic approach is shown at the analysis of an expenditure of a resource by system elements. Presented a probabilistic approach in determining the energy source.
The reasons of an emergency stop of tubular furnaces is destruction of bearings in support of the furnace, bearings and cogwheels in mechanical transmission, failure the electric motor, infringement of integrity of the case of the furnace and it brickwork. In article possibilities on forecasting of a residual resource of bearings of support and transmission are considered, principles of construction of a complex from system of monitoring of a condition and automatic systems of greasing of bearings are offered.
Ways to raise service life of open tooth gearings on an example of a drive of a spherical mill are considered. Results of introduction of automatic system of greasing are resulted and increase ways efficiency of its uses are offered.
Measurements of integrated parameters of friction and their comparative analysis by method of acoustic emission in a ultrasonic range of frequencies (20-300 kHz) for pair friction metal – metal with lubricant in the form of the industrial oil filled by traditional additives (coal) and nanostructured powders on the basis of aluminium are carried out. Influence of firm additives on displacement of a region of dry friction on curve dependences of a parameter of friction from pressure in a zone of contact is estimated. Nanostructured sample on the base of the aluminium powder PAP-2 containing on a surface two-component nanofilm active cationic tensides, which improve antifrictional characteristics of industrial oil I-20 in 4-7 times is revealed. Representations about the mechanism of action of additives on antifrictional properties of oil are developed.
Lubricating value shows loading capacity of transmission oil. Poor lubricating value of friction couples which are used at borderline lubrication ordinary have wear-out areas and these friction couples also fiercely attacked by corrosion. That’s why a decision of choosing oil type have to be substantiated. In this article rapid method of lubricating capacity tests is offered.
For diagnosing transmission of the mountain machine without installation of expensive gauges pilot diagnostics on parameters of a feed of the electric motor, based on the assumption can be used, that the majority of the indignations arising in transmission and influencing at the moment of resistance, overcome by the engine, affects change of instant power consumed by the electric motor.
It is shown, that application of the combined displacement while designing toothed gearings considerably allows to expand area of existence of gearing with a non-standard radial backlash. Influence of parameters of the tool on area of existence of gearing is submitted, the technology of realization of tangential displacement by generation of gears is described.
Advanced diagnostic and monitoring devices are required to carry out timely maintenance and repair of mining equipment and to reduce the number of emergency shutdowns. The article presents a comparative analysis of vibration and acoustic emission diagnostic techniques.
It is shown that the use of combined displacement in gear design makes it possible to considerably expand the area of existence of meshing with non-standard radial clearance. The influence of parameters of the rack-and-pinion producing contour on the area of existence of the meshing is presented, the technology of realization of the tantan-gential displacement in gear cutting is described.
Application of the combined displacement when designing gears allows to considerably expand the area of existence of meshing with non-standard radial clearance. The influence of the parameters of the rack-shaped producing contour on the region of the meshing existence is shown, the technology of the tangential displacement realization during gear cutting is described.
Extensive opportunities to influence the properties of involute gears are available with combined displacement of tooth profiles - a combination of radial and tangential displacements, including the use of cutting tools with a standard initial contour. In particular, by combined displacement, the bending strength and wear resistance of cylindrical gear teeth can be increased by one and a half to two times, which is commensurate with material replacement.
Information is presented about the milestones of the establishment and reforms of the Faculty of Mining and Mechanical, and later of the Faculty of Mining and Electrical Engineering. With the establishment of the Mining School in 1773 seven classes were opened there, including mechanical and drawing. The first subjects, taught in the College, were mine mechanics, theoretical mechanics and hydraulics. The faculty of Mining mechanics as an independent structural unit was founded in the autumn of 1919. Its appearance was connected with the necessity to train specialists in mining engineering, special equipment for mines, dressing mills and mining plants. It was the first in the country mining mechanical faculty. The glory of the faculty consisted of famous scientists A.P. Herman, F.N. Shklarsky, L.B. Levenson, V.V. Chernyavsky, A.A. Shchukin, V.I. Gerontiev. The team of teachers, researchers and graduate students aims at closer cooperation with various mining enterprises and companies, which will undoubtedly have a positive impact on improving the quality of training.
