Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42D—BLASTING
  • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
  • F42D1/04—Arrangements for ignition
  • F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B3/00—Blasting cartridges, i.e. case and explosive
  • F42B3/10—Initiators therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
  • F42C19/00—Details of fuzes
  • F42C19/02—Fuze bodies; Fuze housings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42D—BLASTING
  • F42D3/00—Particular applications of blasting techniques

Definitions

• the invention relates to a connection of detonation tube and lightweight instantaneous fuse for a residue-free explosive system of non-electric detonator used to initiate an industrial explosive in boreholes during underground (tunnelling) or surface (bench blasting) operations.
• the detonation tube residues that are removed from the mine run using various methods, are an environmental burden and must be disposed subsequently in an environmentally friendly manner.
• the detonation tube residues are not possible to separate technologically nor manually, and, in an extreme case, they are left in the environment where they are often only washed into the sea. Therefore, the detonation tube residues are needed to be removed from the excavated mine run, usually a rock, being carried out manually in many cases currently. This fact causes an increase in costs of the blasting work package with treatment of the excavated rock, which is a considerable disadvantage in technological processes involving the use of otherwise highly safe non-electric detonators provided with a low-energy detonation tube.
• connection of the detonation tube and the lightweight instantaneous fuse for a residue-free explosive system of non-electric detonator where the non-electric detonator is created only partially by the detonation tube, wherein the detonation tube is connected to lightweight instantaneous fuse via the concerned connection.
• the connection consists of a tube, in longitudinal opening of which at least one cylindrical seal having inner longitudinal opening arranged on one side of the connection to insert the detonation tube and on the other side of the connection to insert the lightweight instantaneous fuse is attached irremovably.
• the inserted ends of the detonation tube and the lightweight instantaneous fuse are attached in the said seal also irremovably.
• the irremovable attachment of detonation tube and lightweight instantaneous fuse ends in the seal and the irremovable attachment of seal in the tube are carried out preferably via 1 to 4 rims on each side of the connection tube, or the irremovable attachment of detonation tube and lightweight instantaneous fuse ends in the seal and the irremovable attachment of seal in the tube are carried out by gluing.
• the tube is preferably made of metal, wherein it may be made of aluminium, copper, or steel. However, it is possible to be made of plastic as well.
• outside tube diameter is 4 to 10 mm
• longitudinal opening diameter is 3 to 9 mm
• tube length is 20 to 80 mm.
• a flexible seal which may be preferably either rubber or plastic, wherein the seal is one-piece or two-piece, and the outer ends of the seal protruding from the tube are provided with either radius ending, which is safer in terms of potential jamming of the connection when inserting into borehole, or cylindrical ending.
• outer diameter of the seal is preferably 4 to 10 mm; diameter of its inner longitudinal opening is 2 to 9 mm and the seal length is 20 to 80 mm.
• one or both pieces may have a continuous inner longitudinal opening, or this opening is located at the end (arranged to be placed in the tube); it is made narrower to diameter of 1.4 to 1.6 mm at the length of 1 to 3 mm as a stop.
• the initiation power of the lightweight instantaneous fuse should not be higher than 5 g/m of penthrite or cyclonite.
• the present invention eliminates the existing substantial disadvantage of the need for manual separation of waste residues, wherein minimizing environmental contamination and reducing the risk of clogging or damaging the mine run processing equipment.
• such formed residue-free nonelectric detonator meets all the requirements for resistance to mechanical damage when handling (mechanical strength, abrasion and cut resistance), wherein it meets the requirement for electric non-conductivity, while maintaining its original advantage, such as high work safety and potential variability in timing detonating net creation with high water and moisture resistance.
• Fig. 1 shows a non-electric detonator assembly.
• Fig. 2 shows two connections provided with rims and two-piece seals differing in the diameters of their longitudinal openings for detonation tubes and lightweight instantaneous fuses.
• Fig. 3 shows two connections with rims and two-piece seals arranged with a higher axial distance of detonation tubes and lightweight instantaneous fuses as compared to Fig. 2.
• Fig. 4 shows two connections with rims fitted with one-piece seals differing in axial distances of detonation tubes and lightweight instantaneous fuses.
• Fig. 5 shows a two-piece seal connection provided with a single-row rim at both ends.
• FIG. 6 shows the connection without rim, where the two-piece seal is glued in the longitudinal opening of the tube, wherein the detonation tube is glued in one inner longitudinal opening of the two-piece seal and the lightweight instantaneous fuse is glued in the other inner hole.
• Fig. 9 shows a similar piece of the two-piece seal having end shoulder of its inner longitudinal opening, which is, however, provided with a cylindrical ending at the outer end.
• Connection 1 of detonation tube 5 and lightweight instantaneous fuse 6 for residue-free explosive system of non-electric detonator consists of the tube 2, in longitudinal opening of which at least one cylindrical seal 3, 31, 4 having inner longitudinal opening arranged on one side of the connection ! to insert the detonation tube 5 and on the other side of the connection 1 to insert the lightweight instantaneous fuse 6 is attached irremovably, wherein the inserted ends of the detonation tube 5 and the lightweight instantaneous fuse 6 are attached in the seal 3 , 31, 4 also irremovably.
• the seal 3, 3 , 4 must be of outside diameter slightly smaller than the diameter of the longitudinal opening of the tube 2 and, at the same time, the diameters of the inner longitudinal opening so that the detonation tube 5 and lightweight instantaneous fuse 6 can be inserted into them.
• the irremovable attachment of detonation tube 5 and lightweight instantaneous fuse 6 ends in the seal 3, 31, 4, and the seal 3, 31, 4 itself in the tube 2 is carried out either via 1 to 4 rims on each side of the connection l tube 2, see Figures 2, 3, 4, and 5, or the irremovable attachment of detonation tube 5 and lightweight instantaneous fuse 6 ends in the seal 3, 31, 4 of the connection 1 is carried out by gluing 81, see Fig. 6.
• the tube 2 of the connection l may be made of metal, specifically aluminium, copper, or steel, or plastic.
• the outside diameter of the tube 2 is 4 to 10 mm, preferably 7.5 mm.
• the internal diameter of the longitudinal opening ranges from 3 to 9 mm, preferably 6.4 mm; its length is 20 to 80 mm, preferably 45 mm.
• the seal 3, , 4 is made of rubber or plastic, wherein it is made as a one-piece seal 31, see for example Fig.
• one-piece and two-piece seal 31, 3, 4 is 4 to 10 mm, preferably 6.3 mm, at the diameter of the longitudinal opening of 2 to 9 mm, preferably 3 to 4.5 mm, and at the seal 31, 3, 4 length of 20 to 80 mm, preferably 45 mm.
• Initiation power of the lightweight instantaneous fuse 6 is 1 to 5 g/m of penthrite or cyclonite, wherein the value of upper limit should not be exceeded.
• assembly of the non-electric detonator 9 provides the detonation tube 5 ended with a terminal of the non-electric detonator 9 with explosive filler and seal 10 of the detonator 9.
• the other end of the detonation tube 5 leads into the connection 1, where the detonation tube 5 is connected to the lightweight instantaneous fuse 6.
• the connection J must be able to provide transfer the detonation from the lightweight instantaneous fuse 6 to the detonation tube 5 that, subsequently, initiates the explosive filler in the nonelectric detonator 9 and, then, this initiates the industrial explosive in the borehole.
• Length of the detonation tube 5 and length of the lightweight instantaneous fuse 6 are chosen so that the whole detonation tube 5 including the connection ⁇ is inserted into the borehole with industrial explosive and the lightweight instantaneous fuse 6 protrudes from the borehole in a length sufficient to create detonating net in required number of adjusted boreholes by connecting these lightweight instantaneous fuses 6.
• the detonation tube 5 adjusted with the connection i in the borehole is completely destroyed by the activated industrial explosive and the lightweight instantaneous fuse 6 placed outside of the industrial explosive action is completely destroyed by its own explosive transformation.
• the distance of both the ends is as short as possible preferably, in contact ideally.
• connection 1 an exemplary connection of the detonation tube 5 of the non-electric detonator 9 with penthrite lightweight instantaneous fuse 6 having explosive filler of 3.2 g/m was performed using the connection 1, the tube 2 of which was made of copper having the outside diameter of 7.5 mm, longitudinal opening diameter of 6.4 mm, and length of 45 mm.
• the rubber seal 3 consisted of two pieces of outside diameter of 6.3 mm and inner longitudinal opening diameters of 3.15 mm and 4 mm for the detonation tube 5 and the lightweight instantaneous fuse 6, respectively, wherein length of both pieces of the seal 3 was 22 mm coincidently, and both the pieces of the seal 3 was fitted with an inner opening of length of 1.5 mm and diameter of 1.4 mm as a stop on the end, where they come into contact in the connection JL
• the detonation tube and lightweight instantaneous fuse for a residue-free explosive system of non-electric detonator with the connection of the invention are applicable industrially to initiate an industrial explosive in boreholes during underground (tunnelling) or surface (bench blasting) operations.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)
• Fuses (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=66866860

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 2018
  • 2018-05-10 CZ CZ2018-218A patent/CZ2018218A3/cs unknown
• 2019
  • 2019-05-07 EP EP19730664.0A patent/EP3803264B1/en active Active
  • 2019-05-07 WO PCT/CZ2019/000025 patent/WO2019214761A1/en not_active Ceased

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