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Master's
portal of DonNTU
Mining is one of the most important sectors in Ukraine. Conveyor system is the primary means of transportation in the mines. These are complex automation objects from a position as management and security operation.
Conveyors for the automation of an increase in their productivity, reliability, operational safety and reduce injuries. Currently, of utmost importance that control the temperature of heating roller shaft conveyors. By reason of fire belts are up to 30% of fires in mines. Typically, fires happen in the drive stations (64%), tension stations (10,8%) and the linear part of conveyor (25.2%) [1]. The great length of conveyor lines and unpredictable place of fire complicates the process temperature control.
The main causes of fire belts, are typically jammed roller result damage its bearings and friction strip (Figure 1).
Currently, automation of underground mine transport applies basic apparatus automation AUK-1M [2]. This apparatus does not allow for efficient temperature control of the conveyor belt. Automation system should prevent and preclude the development of potential emergencies through continuous monitoring of the heating temperature of rollers along the length of the belt conveyor, provides display information on possible place of heating belt on panel mining dispatcher or the nearest controller to collect information. Must also to control the excess of the permissible temperature of the heating roller and form a signal about the place of excess temperature.
To control the temperature regimes of the main strip conveyor developed the device, the block diagram is shown in Figure 2.
As the sensor uses the heat cable PHSC. PHSC heat cable consists of two steel wires twisted together along the entire length, each of them has an insulating coating of heat sensitive polymer. PHSC wires helically wrapped protective tape and placed in a shell designed to protect against mechanical damage and adverse environmental conditions. When reaching the critical temperature of the heating thermistor material softens, the wires begin to communicate with each other and triggered a fire alarm signal.
Interface module PIM-120 determines the threshold of linear thermal detector and controls the state line to break.
Interface module PIM-430 forms and transmits distance information to the point of triggering the heat cable.
System of emergency fire is used to prevent and extinguish fires by automatic or manual switching start-up valve and pump water from the pipeline fire.
Alarm control unit carries out a continuous control of train signaling and delivery of information to the remote mountain manager, and also generates control signals for the emergency fire-fighting and warning devices.
Application of the device temperature control of the main conveyor belt allows to locate the possible source of heat, increases the safety of miners, reduces time possible downtime of machinery.
In writing this essay master's work is not completed yet. Date of final completion: December 2011. Full text of the work and materials on the subject can be obtained from the author or supervisor after this date.
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