Faculty: Mining Electrical Engineering and AutomationIntroduction
1 Subject topicality.
2 Purpose and targets.
3 Determination of braking torque and static moment values.
Conclusions
At present and for remote prospect coal is a single energy carrier, which volumes are potentially sufficient for almost full provision of the national economy.
The results of the analysis of tendencies of world power engineering development certify that coal accounts for 67 percent, oil – 18 and natural gas – 15 percent in the structure of organic fuel world reserves. In Ukraine these values amount to 95.4 percent, 2 and 2.6 percent. The total volume of domestic coal reserves amounts to about 117.5 milliard tons, among them the industrial ones at functioning mines – 6.5 milliard tons, among which almost 3.5 milliard tons – steam coal [1].
The creation of the material and technical basis is impossible without comprehensive mechanization and automation of production processes. When designing the machines’ construction and means of automation it is necessary to take into account the features of operation modes and provide the fulfillment of safety requirements.
Transport and slope lift play an important part in the general complex of production processes of coal mines.
Along with the extension of the field of transport vehicles of continuous operation the definite place is left for slope and haulage units with end ropes. The rope units are widely used for transportation on slopes of people, rock, materials and equipment. The big part of coal is transported with the help of the units concerned.
Inadmissibly high loads have impact on the rope due to the creeping of lift vessels during braking when lifting the cargo on the slope and haulage units. This happens most often at preservation braking.
The correct idea of dynamic processes occurring during the lifter’s breaking gives the possibility to design, debug and operate slope units more seriously than it is done now. Knowledge of these processes is also necessary for creating brake assemblies that support automatically the machine slowdown in the set limits [2].
This problem was studied in the scientific researches and publications such scientists as K.I. Chebanenko, V.R. Bezhok, B.N. Chayka. A.D. Dimashko, A.N. Yevdokimov and the following research institutions: Novocherkassk State technical University, Dnepropetrovsk Mining Institute, Donetsk National Technical University, Makeyevka Research Institute, etc. On the grounds of the above-mentioned I make a conclusion that the given topic is urgent.
The goal of the given paper is the research of adjustable safety braking of a lifter if one-rope skip lift that can exclude the creeping of the skip on the rope. The creeping exclusion in its turn will let to reduce material expenses for hoist rope operation and repair.
To achieve the paper goal it is necessary to fulfill the following targets:
1. To make a literature review.
2. To study the ways of revision and debugging of brakes with spring-pneumatic drive.
3. To calculate the rope haulage.
4. To choose the lifting machine, engine and reduction gear.
5. To calculate maximum speed of skip movement.
6. To calculate the static moment and braking torque.
Maximum speed of lifting vessel movement is
, (1)The got speed does not exceed the maximum permissible one
Weight of the rotor reduced to the drum diameter
, (2)Weight of rotating parts reduced to the drum diameter
. (3)According to М.М. Fedorov the equation of machine movement during braking when lifting the cargo is the follwoing:
, (4)
- weight of rotating parts reduced to the drum diameter, kg;
- slowdown, m/s2;
- static moment of the machine, N/m, 
, (5)
rope pull of lowering load
is zero. In this case
, (6)
, (7)
- weight of 1 m of rope, N/m;
- length of rope, m
- rope movement resistance factor; 
- angle of working slope. 
- braking torque of the hoisting machine.1. “Концепцiя розвитку вугiльноi промисловостi” Кабинет Министров Украины, Киев, 2005 г.
2. Чебаненко К.И. “Исследование процессов торможения шахтных наклонных подъемных и откаточных установок”. Автореферат диссертации, представленной на соискание ученой степени кандидата технических наук, Донецк, 1969 г.
3. В.Р. Бежок, Б.Н. Чайка “Руководство по ревизии, наладке и испытанию шахтных подъемных установок”. М., Недра, 1982 г., 391 с.
4. А.Д. Димашко, И.Я. Гершиков “Шахтные электрические лебедки и подъемные машины”. М., Недра, 1973 г., 362 с.
5. В.А. Будишевский, А.А. Сулима “Проектирование транспортных систем энергоемких производств”. Донецк, 2002 г., 481 с.
6. В.А. Будишевский, А.А. Сулима “Теоретические основы и расчеты транспорта энергоемких производств”. Донецк, 1999 г., 217 с.
7.Руководство по эксплуатации машин подъемных шахтных.