RU2090830C1 - Method of excitation of detonation wave in explosive charge - Google Patents

Abstract

FIELD: excitation of explosive charge detonation, for instance, in mining art. SUBSTANCE: first additional charge is blasted. If inert spacer 3 is available, a shock wave travels in charge 1. When the wave passes to unloading element 7, an unloading wave reflects to charge 1. Second additional explosive charge 4 is blasted. Unloading element 7 is made of material with dynamic stiffness lower than that of explosive of charge 1. EFFECT: facilitated procedure. 1 dwg

Description

 The invention relates to the field of blasting, in particular to methods of exciting detonation in an explosive charge, and can be used in mining.

 A known method of forming a detonation wave, when the main and additional explosive charges are placed in the shell. The additional charge is made of explosive, the detonation velocity of which is higher than the detonation velocity of the explosive of the main explosive [1] The detonation of the additional explosive charge excites detonation in the main explosive charge.

 A known method of generating a detonation wave in an explosive charge, comprising undermining an additional explosive charge to which a steel plate is adjacent. The plate moves toward the main charge, exciting a detonation wave in it [2]. Between the plate and the main charge there is a foam layer that serves as a support and gasket, and does not interfere with the movement of the plate.

 The disadvantage of these methods is the danger of explosion of the main explosive charge in the event of an unauthorized explosion of an additional explosive charge.

 The problem to which the invention is directed is the initiation of detonation in low-sensitivity explosive charges.

 The technical result of the invention is to increase the safety of work due to the fact that an unauthorized explosion of an additional explosive charge does not lead to an explosion of the main charge.

 The proposed method of detonation excitation in the explosive charge includes undermining the additional explosive charge, which creates a shock wave in the main explosive charge, exiting it into the discharge element and then blowing up the second additional explosive charge from the discharge element. The unloading element is made of a material whose dynamic stiffness is less than the dynamic stiffness of the explosive in the main charge.

 The transfer of a shock pulse to the discharge element is necessary for unloading the explosive: while its shock-wave sensitivity increases.

 The choice of material of the unloading element is due to the need to ensure the unloading of the main explosive.

 The moment of undermining the additional charge is determined from the time of passage of the shock wave along the main explosive charge after the first additional charge is blown up and the unloading wave is formed in the main explosive charge.

 The drawing shows a General view of the device, explaining the method: 1 - the main explosive charge, 2 first additional charge, 3 inert gasket, 4 second additional charge, 5 initiating plate, 6 walls, 7 - unloading element, 8 initiators.

An example of a specific implementation is a device that includes an explosive charge (1) of TATB 30x40x80 mm. On one side of the charge (1), an additional explosive charge (2) was installed from a plastic explosive based on hexogen 7x7x40 mm, separated from the explosive charge (1) by an inert gasket (3) from 5x20x40 mm plexiglass. On the other side of the charge (1), a recess is made in which a second charge (4) is installed from a plastic explosive on the basis of RDX in the form of a half cylinder R 16 m. An initiating plate (5) from a plastic explosive of 2x40x100 mm is installed on the side of the second charge (4). Foam walls (6) serve for the stability of the plate (5). The second charge (4) is separated from the charge (1) by a loading element (7) made of foam, with a density ρ of 0.3-0.4 g / cm ³ and a thickness of 3.5 mm. The means of initiation are electric detonators located 4 in a row.

 The method of generating a detonation wave in the explosive charge (1) includes: undermining the first additional charge (2), as a result of which, in the presence of an inert gasket (3), a shock wave travels over the charge (1), when the wave transfers to the unloading element (7) an unloading wave is reflected in the charge (1) and its shock-wave sensitivity increases; at this point in time, a second additional charge (4) is triggered, initiated through a conductive plate (5) with foam walls (6). The initiators (8) are undermined at the same time, so the difference in the timing of the operation of additional charges (2) and (4) is determined by the length of the conductive plate (5) (70-100) mm.

 Initiation according to this scheme sharply reduces the degree of danger when working with TATB, as random (unauthorized) detonation of additional charges (2), (4) individually or simultaneously does not form a detonation wave in the main charge (1) (for this, inert gaskets (3), (7) are used.

 Thus, the foam pad (7) has a dual purpose: to provide, when an additional charge (4) is detonated, a shock rather than a detonation wave, and to ensure unloading of the main charge (1).

Claims (1)

 A method of generating a detonation wave in an explosive charge, comprising detonating an additional explosive charge, characterized in that a shock pulse is formed in the explosive charge, which is transmitted to a discharge element made of a material whose dynamic stiffness is less than the dynamic stiffness of the explosive charge, then undermining the second additional explosive charge.