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Theme of dissertation:
"Development of the automated diagnostic system of working conditions of the mine main conveyor line"
Has made: Lukyanenko S.A.
Faculty: ENERGOMECHANICS AND AUTOMATION DEPARTMENT (E&A)
Speciality: Automatic control of technological processes and production
THE PURPOSES AND PROBLEMS
The role of automation of mine conveyor transport consists in decrease in labor input of service, liberation of the workers employed on underground transport, and also in increase of safety and decrease in traumatism. It is reached by introduction of necessary blocking and protection, expansion of information opportunities of the automation equipment. Besides modern means of automation should promote optimization of processes of start-up and stop conveyors, to decrease energy and material capacity. One of perspective directions of perfection of the system of service and repair is the method of repair on an actual technical condition, i.e. on demands obligatory periodic or constant diagnostic control a technical condition of the equipment. Such control is carried out by means of technical diagnostics, allowing finding out and eliminating deviations from normal condition and malfunctions of the mechanism in advance and to that operate reliability of the machine can be raised [1].
SCIENTIFIC NOVELTY
Nowadays there is no special equipment of diagnosing technical condition of the main conveyor line. The technical condition of mechanisms of equipment is defined measurements of temperature and rate elements of heating of assembly units and by working fluid, temperature difference in separate elements.
PRACTICAL VALUE
Application of diagnostic methods and devices in service system and repair allows to receive economic benefit as the result of exception disassembly and assembly of operations of the equipment, increase in a mean-time-to-repair, decrease in equipment downtimes and the charge of spare parts, necessity of creation and the maintenance of warehouses of spare parts as spare parts are bought as required disappears. Automation of conveyor transport provides equipment by means of automatic control and protection of each conveyor. Automatic protection is carried out by switching off a drive of the conveyor under a deviation of controllable parameters limits of admissible values.
THE REVIEW OF EXISTING RESEARCHES
Now following means of automation of conveyor transport of mines serially are
issued: a complex of automated control by conveyor lines; the device of the
control of slip and speed of a conveyer belt; the device of the control of
speed; the device of the control of a condition rope bases of conveyor tapes;
the device of the control and information; the device of the signal system and
telecommunication [1].
The complex of automated control is intended by conveyor lines for control of
work conveyor lines. The complex carries out 53 functions, providing zero
protection, consecutive automatic start-up of conveyors and a stop of a
conveyor line from any point along its length, the control of speed of
movement of a tape and start of a conveyor line over time; Blocking and
the signal system about work of a conveyor line, continuous self-checking
of serviceability of a circuit of switching-off of a control panel and a
circuit of emergency switching-off of the conveyor. In figure 1 the block
diagram of complex is resulted.
Figure 1 – the Block diagram of complex of automated control by conveyor lines
Complex consists of one control panel and 10 blocks of control. Remote
device indicator, telephone tube, sound signaling device, the block of
trailer relay, a push-button post of control are parts of control panel.
Telephone tube, gauges of speed, sound signaling device, gauges of the
control tails tapes, a cable-rope switches, the block of the relay of
speed are parts of blocks of control. The complex provides performance
of following functions on control: consecutive automatic start-up of the
conveyors included in the line; automated control by a conveyor line from
buttons of a control panel, and also from a remote push-button post; the
termination of start of a conveyor line from any block of control.
Device of the control of slip and speed of a conveyer belt is intended
for the control of work and protection against overloads of tape conveyors.
This device is used to switch off a drive of the conveyor is in the emergency
operation.
Device of the control and information is intended for emergency switching-off
of the conveyor when a cable-rope device switches. As a rule, the device is
used together with complex of automated control by conveyor lines on the
main conveyor lines long more 1000m, equipped by automatic vertical gravity
take-up. Use of device of the control and information allows to receive more
information on the condition of devices of the control over conveyor
transport, expands telemechanical functions of the device of transfer of
number of the switch which has worked, or the gauge in a line of emergency
switching-off, reduces time of search of malfunctions and idle time of a
conveyor line.
The device of the signal system and telecommunication is intended for
maintenance of the precautionary emergency and code sound signal system, and
also for duplex telecommunication with complex of automated control by conveyor
lines or other devices located along mine conveyors of the big extent [2].
RESULTS OF RESEARCHES
The prospect of the further development of the coal-mining industry is the
increase of efficiency of technological processes by application of the
computer-integrated systems of automated management [3] which allow to
organize technological processes at the qualitatively new level, excepting
unproductive expenses of time and power resources changing dynamic parameters
of object. The transport complex of mine carries out delivery of mineral from
clearing faces up to the surface of the mine. During work of the conveyor
line the most favorable proportion should be provided (on conditions of
economy of the electric power) a loading level of tape to size of a tape
speed. When there’s no solid material on the tape the conveyor stopped. It
will allow to lower consumption of electric energy due to reduction of an
operating time of conveyors when it is empty, and will also raise their job
term. The current control systems of mine conveyor installations do not allow
to regulate enough speed of tape movement effectively [4,5]. The equipment
should consist of devices of the control of coal weight and drive temperature
and the environment above the tape and also means of transformation,
strengthening and signaling to the executive equipment.
For contact less measurement of temperature of heating drive is used the
pyrometer of series МТ4 which can be fastened drive devices. In order to
receive a signal proportional to temperature of drive heating the scheme
of transformation of the joint venture is used. The measure the temperature
above the tape they use digital thermometers of type DS1820 which are
installed on distance of 20 m from each other along length of the tape
conveyor. For measurement of the weight of coal on the tape electronically
hydraulic conveyor scales is used. The signal from electronically hydraulic
conveyor scales is sent to digital-to-analog converter and further to the
scheme of comparison. The intensifying converter is used, because a pyrometer
send very weak signal. Scheme of comparison receives the transformed signal.
Digital thermometers of the type DS1820 are intended to measurement of
temperature long objects, for example, a conveyor tape. The given
signal is impossible to submit on the scheme of comparison, so block of the
converter of temperature is necessary.
Figure 2 – The block diagram of the automated diagnostic system of working conditions of the mine main conveyor line
The weight of coal is measured by means of electronically hydraulic conveyor scales, the signal being transformed to digital-to-analog converter of type 572ПА1. Scheme of comparison receive operating influence which send in complex of automated control by conveyor lines. At first information gathered from the transport complex of the mine in local means of automation. Then the signal is sent in the microcontroller and microcomputer through a liaison channel where the received information is processed. Operating influence is formed which sent complex of automated control by conveyor lines is feed-back in the transport complex of mine.
THE CONCLUSION
The prospects of the further development of the coal-mining industry are to increase efficiency of technological processes by application of the computer-integrated systems of automated control [7] which allow to organize technological processes the excepting unproductive expenses of time and power resources at changing of dynamic parameters of object.
The list of literature
1. Диагностирование забойного оборудования/ А.А. Бойцов, И.А. Левитес, Л.Л. Лейко, С.В. Шумейко. - К.: Техніка, 1984. - с. 3-5.
2. Справочник по автоматизации шахтного конвейерного транспорта/ Стадник Н.И. и др. К.: Техника, 1992. - 438с.
3. Автоматизация производства на угольных шахтах/ Г.И. Бедняк, В.А., Ульшин, В.П. Довженко и др. - К.: Техника, 1989. - 272с.
4. Автоматизация конвейерного транспорта на угольных шахтах/ Н.Я. Лазукин, Е.К. Травкин, В.М. Ротенберг и ДР.– М.: ЦНИЭИуголь, 1975. – 55с.
5. Системы и устройства автоматики для горных предприятий на основе микроэлектроники и микропроцессорной техники/ Под ред. Ю.Н. Камышина и Л.Г. Мелькумова. – М.: Недра, 1992 – 363с.
6. Автоматизация подземных горных работ/ Под ред. Проф. А.А. Иванова – К.: Вища школа, 1987 – 328с.
7. Романенко В.Д., Игнатенко Б.В. Адаптивное управление технологическими процессами на базе микроЭВМ. Киев: Вища школа, 1990. – 334с.
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