Abstract
The scientific paper presents the synthesis of research results undertaken to develop the technical and methodological infrastructure for assessing the safety of means of initiating explosives, on the abrasion resistance of rheophores of electric detonators, in order to increase the safety of their use. The state-of-the-art OPVA 10 equipment is used to test the ability of rheophores insulation to withstand the abrasion forces that may occur during normal use. This equipment with a programmable automatic ensures the testing of the rheophores of the electric detonating staples to determine the abrasion resistance under the operating conditions provided by the harmonized European standard EN 13763-4 and the technical specification of the manufacturer, the operating temperature of this equipment being between 10 ÷ 30 °C ensuring at the highest level the fulfillment of the technical requirements imposed by the European and international regulations in the field.
Highlights
Explosives for civilian use can be classified according to several criteria, one of which is essential to delimit them in terms of their role in carrying out the shooting operation
The topic addressed in the paper is of particular importance in terms of harmonizing the existing level of technical competence at national level with the international profile performance, regarding the observance of the security requirements specific to the means of initiation from the perspective of verification and ensuring keeping the integrity of the plastic casing related to the rheophores of electric detonators and shock tubes, following their testing under different temperature conditions at predetermined loads according to the applicable references
For rheophores, the time required for the insulation to penetrate is determined, and for shock tubes, their operation is tested after immersion in water [9,10]
Summary
Explosives for civilian use can be classified according to several criteria, one of which is essential to delimit them in terms of their role in carrying out the shooting operation. The topic addressed in the paper is of particular importance in terms of harmonizing the existing level of technical competence at national level with the international profile performance, regarding the observance of the security requirements specific to the means of initiation from the perspective of verification and ensuring keeping the integrity of the plastic casing related to the rheophores of electric detonators and shock tubes, following their testing under different temperature conditions at predetermined loads according to the applicable references. The principle of the test method is that the test specimens (thermally conditioned for at least 2 hours before the test) are subjected to abrasion on an abrasive surface, which moves at a certain speed, while applying the established load For this purpose, for rheophores, the time required for the insulation to penetrate is determined, and for shock tubes, their operation is tested after immersion in water [9,10]. The rotor must rotate at a speed of (9.96 ± 0.18) rpm so as to obtain an average peripheral speed of (0,075 ± 0,001) m/s. - The load to be applied to the specimen by means of the articulated arm (2) must be (8,35 ± 0,05) N. - The pulley (4) has a diameter of (70 ± 1) mm and allows a tensile load of (8,1 ± 0,5) N to be applied to the test piece by means of a rod and a weight. - Digital timer with relay output must be able to: can be adjusted to a predetermined duration, in the range (from 0 to 10) s ± 0,1 s; be switched on (triggered) when the articulated arm is raised by the sample; to automatically stop the rotor when the preset time has elapsed (required only for testing the shock tube); to turn off the rotor automatically when electrical contact is made between the rheophore and the abrasive belt or rotor (required only for rheophore testing) [10]
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