CZ2017238A3 - An expansion cartridge for non-detonation rock disintegration and destruction - Google Patents

Abstract

The present invention relates to an expansion pad for non-detonating disintegration of rock and for destruction comprising a housing (1) closed by a stopper (2), the plug (2) extending into the inner space of the housing (1) an electric igniter (3) and an inner space of the housing (1) is filled with propellant (5). In the inner space of the housing (1), a longitudinal initiating element (4) is provided in the free-flowing propellant (5).

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to an expansion charge for non-detonating rock disintegration and destruction, comprising a housing closed by a plug, wherein an electric igniter extends through the plug into the inner space of the case and the inner space of the case is filled with propellant.

BACKGROUND OF THE INVENTION

1O For detaching excessive rock, blasting and destruction in environments where explosives cannot be used for various reasons, non-detonating agents are used, whose function is based on the rapid generation of a large volume of fumes and hence a high pressure in the disconnected environment by a burning propellant. These M expander charges are used in places where the use of conventional explosives would cause damage due to the bursting of debris, the shockwaves and the sound effect.

The essential requirements for these devices are the elimination of the shock wave during application and the safety during initiation outside the disconnected environment.

2p The propellant in these blasting compositions is primarily smokeless powders or mixtures thereof with granular ammonium nitrate. Initiation is carried out by an electric igniter.

A disadvantage of these blasting means is the relatively frequent failure if the expansion charge is not sufficiently sealed by the seal in the material to be disassembled. If the seal is not long enough and of good quality, it will not maintain sufficient pressure in the well, the propellant in the expansion charge will extinguish or slowly burn out after initiation, and the expansion charge will not create sufficient gas pressure to disconnect the material.

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Thus, the required seal length limits or even excludes the applicability of these expansion charges in smaller-sized objects (for example, concrete columns and smaller-sized walls during destruction).

It is an object of the present invention to overcome or at least alleviate the disadvantages of the prior art, in particular to reduce the quality and length requirements of the seal required to create sufficient pressure in the material to be disassembled, thereby increasing the effect of expansion charges and reducing their failure rate.

SUMMARY OF THE INVENTION

The object of the invention is achieved by an expansion charge for rock disintegration and destruction, which consists in the fact that a longitudinal initiator element, which is associated with an electric igniter, is inserted in the bulk of the sleeve in the bulk propellant.

The expansion charge according to the invention exhibits an increase in the rate of formation of gaseous fumes in the material to be discharged, so that the bore pressure exceeds the tensile strength of the material to be discharged, even in the case of partial leakage. The specific initiator element of the expansion charge according to the invention provides for ignition of the fine-grained propellant in the entire charge volume in a shorter X time than when ignited by the prior art electric igniter.

The expansion charges according to the invention can be produced in any diameters and weights required for a given type of blasting or destruction work. A further advantage of using the initiator element in the cartridge according to the invention is that when initiating the cartridge without sealing (i.e. outside the material to be disconnected), the flue gas pressure generated by ignition of the inner surface of the longitudinal initiator element suffices to tear the cartridge. without igniting the fine grain propellant charge. This is in full agreement with the requirement for safe application, handling, safe storage and transportation of the cartridge.

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Drawing Clarification <p

The invention is shown schematically in longitudinal section on FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

The invention will be described by way of example of an expansion charge which comprises a sleeve 1, generally cylindrical, but may also have a different cross-sectional shape. The housing 1 is formed of a suitable material, eg plastic, hydrophobised cardboard, etc. The housing 1 has dimensions, i.e. length, transverse dimensions, wall thickness, etc. that correspond to the future use of the respective t-carton, so that numerous cartridges of different diameters can be formed. with the desired effects.

The housing 1 is closed by a plug 2. The electric igniter 3, the active part of which is directed to the interior of the housing 1, is passed through the plug 2. The electric igniter 3 is provided with lead wires 30 for connection to a firing device (not shown).

A longitudinal initiation element 4 is inserted in the interior of the housing 1 in the direction of the length of the housing 1, which is assigned to the active part of the electric igniter 3 at one end thereof. from fast burning nitrocellulose dust mass. In the illustrated embodiment, the longitudinal initiation element 4 is tubular, which accelerates the ignition over the entire length of the element 4. In terms of parameters, it is preferred that the value of the Garnamax emission function. The longitudinal initiation element 4, in the form of a tube of a rapidly burning nitrocellulose powder mass, is greater than 30 25 MPa / cm &^lt; -1 ^&gt;

and

The longitudinal initiator element 4 is filled with a propellant 5, preferably a fine-grained propellant, in the interior of the housing 1, which is particularly advantageous for increasing the rate of combustion. An example of a suitable 3‘ fine grain propellant 5 is nitroglycerin bead powder, but the invention is not limited to the use of nitroglycerin bead powder. The longitudinal initiation element 4 is in the interior space of the housing

:. PS2U54C1 is most preferably arranged along the longitudinal axis of the housing 1, allowing uniform filling of the propellant 5. In the case of a tubular longitudinal initiation element 4, the cavity of the longitudinal initiation element 4 is empty to achieve the fullest possible combustion along the entire length. The length of the longitudinal initiation element 4 is at least 15% of the length of the propellant charge 5 in the housing 1, in order to ensure good operation, ideally the length of the longitudinal initiation element 4 is at least 25% of the length of the propellant charge 5 in the housing 1.

Industrial applicability

The invention can be used in the manufacture of non-detonating blasting means for rock disintegration and destruction.

Claims (6)

PATENT CLAIMS An expansion charge for non-detonating rock disintegration and destruction, comprising a housing (1) closed by a plug (2), the plug (2) passing into the inner space of the housing (1) an electric igniter (3) and the inner space of the housing (1). filled with a propellant (5), characterized in that a longitudinal initiation element (4) is disposed in the loose propellant (5) in the inner space of the housing (1), which is associated with an electric igniter (3) at one end thereof. Expansion charge according to claim 1, characterized in that the longitudinal initiation element (4) is formed by a tube. Expansion charge according to claim 1 or 2, characterized in that the longitudinal initiation element (4) is formed from a rapidly burning nitrocellulose dust mass. Expansion charge according to any one of claims 1 to 3, characterized in that the longitudinal initiation element (4) has a length of at least 15% of the length of the propellant charge (5) in the housing (1). Expansion charge according to claim 4, characterized in that the longitudinal initiating element (4) has a length of at least 25% of the length of the propellant charge (5) in the housing (1). 6. Expansion charge according to claims 2 and 3, characterized in that the longitudinal initiation element (4) has an emission function value of Gamamax. higher than 30 MPa .s ^_1 'ή V / ^Z / measured on ballistic bomb sealed volume of 89 ml and a charge density of ^0.1! g.cm ' ³ . lv 2011-238