RU65206U1 - CARTRIDGE FOR CHARGING WELLS BY WATERPROOF EXPLOSIVES - Google Patents

Abstract

The utility model relates to the field of blasting in mining enterprises, mainly in open cast mining, and can be used when loading flooded wells with non-resistant explosives, for example, based on granular ammonium nitrate.

The technical result of the utility model is to increase the efficiency of the use of cartridges with non-water-resistant explosives by increasing the tightness and reducing the likelihood of damage to their shell.

A cartridge for charging flooded wells with non-water-resistant explosives is proposed, comprising a shell 1 made of durable polyethylene, in which BB 2 is placed. A design feature is that the cartridge has an additional outer shell 7 of single or double woven polypropylene and an inner sealed shell 5 of polyethylene, into which shell 1 with explosives is placed.

The number of shells can be increased through the use of additional shells made of polyethylene, for example, to enhance any properties.

The outer shell protects the cartridge from mechanical damage from external factors, and the inner shell ensures the tightness of the cartridge. A flooded well charged with these cartridges can be in standby mode for blasting for a long time, while the detonation properties of the explosive are preserved. 2 cpf, 2 ill.

Description

The utility model relates to the field of blasting in mining enterprises, mainly in open cast mining, and can be used when loading flooded wells with non-resistant explosives, for example, based on granular ammonium nitrate.

It is known the use of combined charges for loading waterlogged wells (Belov V.I. et al. Tests of water-resistant combined charges from packed ammonium nitrate and granulite. - Mining Journal. - M. - No. 8. - 2000. - P.29-31).

The known design of the combined charge contains non-water-resistant granular ammonium nitrate, packaged in a polypropylene shell in the form of cartridges weighing from 15 to 30 kg and a waterproof granulotol. The process of formation of such a combined charge includes feeding into the well of cartridges with a non-water-resistant explosive and filling into the gap between the walls of the well and granulotol cartridges with a ratio of used explosives from 50:50 to 70:30 (%). After the charge shrinks, the intermediate detonator is lowered for 30 minutes and filled with granulotol. When an action movie explodes in the upper part of the charge, detonation propagates to the bottom of the well along the granulotol column, after which explosive decomposition of granules and nitrate solution inside the shells occurs.

The main disadvantage of the known combined charges with the placement of a non-water-resistant explosive in a water-permeable woven polypropylene shell is that it often detonates only granulotol, i.e. such charges have a low explosion efficiency and the duration of their stay in the wells is limited by the time of formation of a water-saturated solution of nitrate (6-10 hours).

Known application for charging flooded wells with non-water-resistant explosive shells made in the form of a waterproofing sleeve made of durable polyethylene with a hermetically sealed lower end (RF patent No. 2131584, class F 42 D 1/10 with priority dated June 24, 1997, published in 1999, B. No. 16).

The upper end of the sleeve is fixed to the sleeve and, using a charging hose, a non-water-resistant explosive is fed into the sleeve. As filling, the sleeve with the charging hose is lifted, while the waterproofing sleeve comes off the sleeve. After loading the well, an action movie is installed, the well is clogged and blown up.

The main disadvantage of the known cartridge should be attributed to low reliability, because the shell into which the explosives are placed is not sealed. Due to safety conditions, tight sealing in the borehole of the upper end of the polyethylene sleeve cannot be carried out, and all other methods of hermetically closing the ends of durable (more than 100 microns thick) polyethylene are not effective. Ensuring tightness by reducing the thickness of the film leads to a decrease in its strength, and due to the pressure of the explosive granules on the shell or friction with the walls of the well, a shell break can occur.

The technical result of the utility model is to increase the efficiency of the use of cartridges with non-water-resistant explosives by increasing their tightness and reducing the likelihood of damage to the shell when loading wells and finding cartridges in them.

A cartridge design for loading wells with non-water-resistant explosives is proposed, including a shell made of durable polyethylene in which the explosives are placed.

The difference is that the cartridge is equipped with an outer shell of woven polypropylene and an inner shell of polyethylene, made airtight, in which a shell with explosives is placed.

The difference is also that the inner shell has ends tied in the form of a “knot”, and the shell in which the explosive is placed, is made airtight from at least one end.

Another difference is that the cartridge can additionally be equipped with several more shells made of polyethylene.

The shell of the cartridge is made of durable, more than 100 microns thick polyethylene, which provides increased resistance to rupture with explosive granules, however, it does not provide tightness, as its end connections in the "forelock" or in the form of a "node" pass water due to the significant thickness of the polyethylene. In addition, it may be damaged due to exposure from the side of the well walls when lowering the cartridge. The presence in the proposed cartridge of the outer shell of woven polypropylene eliminates this type of damage, because woven polypropylene has high strength and reliably protects all subsequent polyethylene sheaths.

The inner shell of thin polyethylene (less than 100 microns), in which a strong shell with explosives is placed, is characterized in that its end connections in the form of a "node" possess the necessary tightness. In this regard, the implementation of the cartridge for non-water-resistant explosives with several shells, each of which has certain functions, is expedient and ensures the achievement of the final effect - increasing the efficiency of using non-water-resistant explosives for loading flooded wells.

The essence of the utility model is illustrated by the drawing, where in Fig.1 shows a General view of the cartridge, and in Fig.2 - the placement of cartridges in the well.

The cartridge for loading wells with non-water-resistant explosives contains a shell 1 made of durable polyethylene with a thickness of more than 100 μm, in which a non-water-resistant explosive 2 is placed.

This shell is hermetically sealed from the lower end with a seam 3, and its upper end is laid in the form of a fold 4 or tied in a “knot” or “forelock”.

The cartridge has an inner shell 5 of thin polyethylene (less than 100 microns), in which the upper end is tied tightly into a “knot”

6, in which the shell 1 with BB is placed. The lower end of the shell 5 is hermetically sealed or tied in a “knot”.

The execution of the shell 5 of thin polyethylene provides a tight tie of its ends and eliminates the penetration of water inside. The outer shell 7 of the cartridge is made of single or double woven polypropylene, and its ends can be stitched.

The number of shells may be greater than the above, due to the introduction of additional polyethylene shells, for example, to enhance any properties, make the cartridge heavier, place a detonator, etc.

The loading of the well is carried out by lowering the cartridges 8, the detonator 9 with the detonating cord 10 or the blasting network and jamming into it. As stemming can be used a column of water 11 in the well.

The outer shell protects the cartridge from mechanical damage from the side of the borehole walls, and the inner shell ensures the tightness of the cartridge, i.e. It protects the explosive charge from water. A flooded well charged with these cartridges can be in standby mode for blasting for a long time (5-7 days), while the detonation properties of a non-water-resistant explosive are preserved.

Claims (3)

1. A cartridge for loading wells with a non-water-resistant explosive, comprising a shell of durable polyethylene in which the explosive is placed, characterized in that it is provided with an outer shell of woven polypropylene and an inner shell of polyethylene, sealed, in which the shell with the explosive is placed. 2. The cartridge according to claim 1, characterized in that the inner shell has ends tied in the form of a “knot”, and the shell in which the explosive is placed is at least sealed from one end. 3. The cartridge according to any one of paragraphs.1 and 2, characterized in that it is additionally equipped with several shells of polyethylene.