Abstract
Content
- Introduction
- 1. Theme urgency
- 2. Goal and tasks of the research
- 3. Development of the construction of the traction device of monorail locomotive
- Conclusion
- References
Introduction
The coal industry is one of the leading industries of Ukraine. Prospects for the development of the national economy show that coal remains one of the main fuels. The development of the coal industry is carried out in continuous interaction with other sectors of the economy, enterprises that are always associated with many industrial and socio-economic relations with other enterprises of coal-mining areas of the basin. The use of suspended monorails in the industry known for more than 150 years [1]. They are used as an auxiliary transport coal mines, because they provide movement of materials and people to develop with alternating profile.
Technical progress in the coal industry in the underground mining of coal is based on the widespread introduction of advanced technology and the expansion of complex mechanization of clearing and preparation. However, the transition to the use of new technology and increase the efficiency of labor can only be achieved when the existing mine ways of opening and preparation of mine field of reservoir development, capable of providing favorable conditions for the reproduction of modern preparation of coal reserves, aerial work vehicle, effective ventilation of mine workings, as well as activities to combat the adverse factors.
1. Theme urgency
The main directions of economic and social development of Ukraine in the currently anticipated further development this method of coal mining, especially that due to peculiarities of the valuable coal deposits of coal are mined almost exclusively by underground methods. Therefore, improving the technology of underground coal mining, provides a high efficiency coal mining, rational use of stocks and work safety, is of paramount importance.
One of the important roles played by monorail that reduce production costs, reduce labor intensity of mining operations and improve their security. This issue is devoted to this work. The use of these vehicles and also for transportation of miners makes it relatively cheap and easy way to increase the efficiency of the work team stope and, consequently, improve the technical and economic feasibility of using high-slaughter equipment.
Based on the above factors we can talk about the relevance of the use of monorail roads in mining enterprises, and accordingly the relevance of the chosen theme of master's work.
2. Goal and tasks of the research
The main goal is to study the parameters and the development of hybrid suspended monorail locomotive for coal mines.
To achieve this goal it is necessary to solve the following problems:
– The equation that determines the ability of traction;
– Set the limit load mass monorail locomotive of goods;
– Make recommendations on the choice of the type of clamping mechanism of the drive wheels.
When solving the problems the following assumptions:
– The train is considered as a material point;
– Normal load on the drive wheels do not change over time;
– Contact the drive wheels and the constant friction properties remain unchanged.
3. Development of the construction of the traction device of monorail locomotive
Integrating the traction device is characterized by its geometric parameters determining the possibility of movement on the curve (rounded) and other irregularities monorail track without jamming.
The basic geometric parameters include the diameter and width of the drive wheels; rigid base of the traction device and the radius of inscribing. The relationship of these parameters greatly affect the performance of the traction device and, in general, monorail locomotive.
Existing studies and publications for entering mobile units monorails do not solve fully issues related to the process of movement of the drive wheels of the traction device in vertical and horizontal rounded, because it does not take into account the relationship between the parameters and suspended monorail locomotive path as well as the cross section of the monorail [2–4].
Typically, the path of industrial monorail roads are made of I-section. Since the drive wheels jamming occurs primarily between the flanges of the monorail, in studies accounted inclined arrangement of the rolling surface running wheels.
When compiling a mathematical model describing the geometry of the passage of rounding, the following assumptions:
– The shape of the drive wheels - cylindrical;
– Deformations in the contact of the wheels with monorail does not affect the geometrical parameters of the movement;
– Monorail absolutely rigid body.
Assumptions essentially no significant impact as possible deformations do not exceed the tolerances for engineering calculations.
Design traction device perform according to a modular principle. The module has two friction drive wheels are forcibly pressed against the monorail on both sides thereof. Monorail locomotive may have 1, 2 or 3 modules.
Each drive has a gearbox and electric motor. Traction wheel are located on both sides of the monorail and placed on the frame of the traction device with the road wheels. As an energy source used to move the motor crane.
We accept motor АИУК-160S6 with an electromagnetic brake, which has a nominal angular velocity пдв = 980 rev / min, power Nдв = 11 kW and gear 2Ц-100Н-НС, which has a nominal angular velocity of the output shaft pvih = 190 rev / min, maximum power 15 kW.
Set the maximum speed of the towing device, if the traction wheels have a diameter D = 0,406 m and B = 100 mm.
According to the manufacturer OJSC Dneproshina
maximum pressing force of traction wheels can be 8 kN. If the friction coefficient ψ = 0,45, the maximum tractive effort will be
The maximum torque which can realize driving wheel according to structural diagram on Fig. 1 will
Figure 1 – The construction scheme of the traction device monorail locomotive 1 – traction wheels; 2 – reducer; 3 – electric motor; 4 – a monorail
The maximum torque that can be adopted to realize the the electric motor
where η – the efficiency of the reducer, equal to 0.95.
Which shows that the drive has a margin of installed capacity. Safety factor is
Conclusion
To make better use of the power of the locomotive, you must apply at least three levels of clamping force to the drive wheels of the monorail, each of which must match the weight of the cargo.
Influence of parameters of incorporating traction device on the geometrical dimensions of the drive wheels is ambiguous. Analysis shows that at equal rigid base for the traction device with a symmetrical arrangement inscribing radius is greater than the eccentricity. Thus, for the same width of drive wheels mounted symmetrically with respect to the traveling wheels surmounted radius of 10 ... 15% larger than for eccentrically located 0.3 m and 40.50%, than with an eccentricity of 0.5 m. The rigid basis 0.6 ... 0.8 m, and the width of wheels 100 mm Minimum radius may be 8 m, and with a rigid base 1,0.1,2 m – 12 m.
From the analysis of the bias circuit it is obtained that the movement of the horizontal rounded creating additional load on the drive wheels caused by their care and increasing the distance between the axes of rotation. If a straight section of the pressing force vectors are directed along a straight line passing through the axis of rotation of the wheels, then rounded – for a variety of lines passing through the axis of rotation of each wheel and the center of curvature of rounding. Due to the fact that the directions of the forces are not the same, there is a bend monorail. There is an additional load is proportional to the coefficient of variation of the axle distance, which is depending on the radius of curvature and the parameters of the traction device is changed from 1.0 to 1.6. The coefficient determines the additional resistance when driving in curves, due to an increase in load on the drive wheels that must be considered when designing a monorail locomotives and traction calculations.
References
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- Петренко О.С. Подвесные рельсовые дороги // О.С. Петренко. – М.: Машиностроение, 1981. – 272 с.
- Проектування та конструювання транспортних і підйомних машин та комплексів // Під ред.В. О.Будішевського. – Донецьк: Норд-прес, 2009. – 599 с.
- Веткин А.С. Вписування локомотивів у вертикальні закруглення монорейкових шляхів // Гірські, будівельні і дорожні машини – Вып. 35 – Киев, 1983. – с. 73-76.