Faculty of Ecology and Chemical Technology
Speciality: Chemical Technology of Macromolecular Compounds
Electric detonators breakdown caused by explosive device, explosive network or electric detonator fault condition leads to blast-hole charge explosive breakdown. It leads to environment pollution since explosives contain І – ІІ hazard class substances (TNT, etc) [1]. Thus this work touches on the problems of health and environmental safety.
Work object is explosive devices and electrical network verification for blasting operations safety rise.
Search by authors on the Internet at the global (world), national (Ukraine) and local (DonNTU) levels did not match any of the results that correspond with the theme of work. Therefore, we can state say that this is a new work from a scientific perspective and scientificaly unique.
Mostly it is creating stand for explosive devices and electric network characteristics verification which will be universal and simple in design .
Electric blasting is the most common blasting operation method. Electric blasting with a electric detonators assumes synchronous and consistent charges detonation in groupe [2]. Electric blasting operations is the only admissible explosive charges blast-hole blasting method in coal mines. This method is more safe then fuse blasting since it allows to blast more charges and may be use in any conditions [3].
Quality and safety of blasting operations depend on explosive materials and blast instruments quality first of all. Blast instruments are electric detonators and explosive devices. Electric parts of electric detonators are absolutly control before the use, therefore it is necessary to control the explosive devices.
Today explosive devices are controled with the help of Explosive Impulse Control Device (ПКВИ-3М) before giving out for work. ПКВИ-3М device has some lacks and doesn't allow to find out explosive device characteristics.
Explosive device intactness control requires special apparatus use, since duration of explosive impulse is 2 - 4 ms [4].
Having studed explosive devices intactness problem we create a laboratory stand on a personal computer base for verification explosive devices characteristics (pic. 1). The stand consists of following units: explosive device (ВП); resistor bank R1; comparative resistor R2=1 Om; ballast resistor R3=1 kOm; stabilitron KC 133; connective wires. Stabilitron and ballast resistor are necessary for personal computer protection. Resistor bank is necessary for electric network modelling.
Picture 1 – Laboratory stand scheme
Stand work testing was realized on three different resistances (191, 201 and 221 Om, pic. 2).
Picture 2 – Current impulses picture
Data handing in MathCAD programming environment showed correct work of explosive device and stand.
Picture 3– Laboratory stand work animation (5 pictures, 7 review cycles, size 24 KB)
Assigned task was reached.
In future it is planned the improvement of laboratory stand and development of laboratory practical works for students.