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WO2018161099A1 - Câble de raccordement de détonateur étirable - Google Patents

Câble de raccordement de détonateur étirable Download PDF

Info

Publication number
WO2018161099A1
WO2018161099A1 PCT/ZA2018/050012 ZA2018050012W WO2018161099A1 WO 2018161099 A1 WO2018161099 A1 WO 2018161099A1 ZA 2018050012 W ZA2018050012 W ZA 2018050012W WO 2018161099 A1 WO2018161099 A1 WO 2018161099A1
Authority
WO
WIPO (PCT)
Prior art keywords
elements
core
length
cable
conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/ZA2018/050012
Other languages
English (en)
Inventor
Daniel Mace
Johannes Petrus Kruger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Detnet South Africa Pty Ltd
Original Assignee
Detnet South Africa Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Detnet South Africa Pty Ltd filed Critical Detnet South Africa Pty Ltd
Publication of WO2018161099A1 publication Critical patent/WO2018161099A1/fr
Priority to ZA201902632A priority Critical patent/ZA201902632B/en
Priority to AU2019100494A priority patent/AU2019100494A4/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F42D1/045—Arrangements for electric ignition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/06—Extensible conductors or cables, e.g. self-coiling cords

Definitions

  • This invention relates to a cable for use in a detonating system.
  • Electronic detonators in a detonating system can be interconnected using wireless techniques, or by using appropriate cables. At present wireless techniques have not found widespread acceptance. Reliable connections can however be made using suitable cables but, at a blast site, the cables can fail due to a variety of factors.
  • a cable which is placed in a borehole can break due to impact damage which occurs when the borehole is filled with explosive or stemming. Stretching and consequent breakage of the cable can be caused by slumping of the material in the borehole. If insulation on the cable is compromised by robust treatment conductors in the cable can be short-circuited, particularly if exposed to water or other fluids, or open-circuited.
  • Arduous conditions can prevail at a blasting site and cable damage can thus arise from a number of causes.
  • vehicle traffic, and chemicals such as diesel, can stress insulation on a cable and increase the probability of breakage of the insulation, or of water ingress through the insulation.
  • Environmental effects such as strong ambient temperature variations, which can range from -40 ° C to +80 ° C, can rapidly degrade the insulation in a cable.
  • a cable typically has a steel or copper core encased in a suitable insulator.
  • the tensile strength of a steel cable is greater than the tensile strength of a copper cable.
  • a copper cable could be elongated by up to 40% before breaking whereas a steel cable would normally break if elongated to a substantially lesser extent. Copper is however more expensive than steel.
  • An object of the invention is to provide a cable which addresses at least some of these issues.
  • the invention provides a cable which includes an insulating stretchable sheath, a conductive core of a first length encased within the sheath, the core including a plurality of conductive elongate elements, at least some of the elements being shorter than the first length, the elements being assembled in longitudinally extending, side-by-side conductive contact with one another over the first length.
  • the core is formed from a plurality of discontinuous conductive elements which are positioned in a longitudinally extending configuration wherein some elements are displaced from other elements along the length of the configuration and wherein the elements are positioned to provide a continuous electrically conductive path along the length of the core.
  • Each element may have a predetermined length which may be significantly shorter than the length of the core i.e. the first length which is of an indeterminate dimension.
  • each element may have a length of from 10cm to 10m. This is exemplary only.
  • the elements are arranged so that the elements are located at spaced apart positions along the length of the cable. Thus each of the ends are displaced, relative to one another, in a longitudinal direction of the core.
  • Figure 1 illustrates a plurality of spun copper elements or strands
  • Figure 2 illustrates an optional intermediate process in which the spun elements of Figure 1 are twisted together
  • Figure 3 illustrates a length of a cable according to the invention
  • Figure 4 illustrates an alternative way of making a cable in accordance with the principles of the invention.
  • the invention provides a cable which includes an insulating sheath which encases a core comprising a plurality of copper elements, each of a relatively short length, which are configured so that they can slide relative to each other when the cable is stretched.
  • the elements are positioned side by side, in an overlapping relationship with one another, along the full length of the cable, so that a continuous conductive path is provided by the assembly of elements.
  • the sheath is made from a suitable insulating polymer material which is capable of accommodating a substantial degree of stretch.
  • FIG. 1 of the accompanying drawings illustrates a number of copper elements 10.
  • Each element 10 is formed from one or more copper filaments with a diameter of 0,07mm. The filaments are positioned in a longitudinal path overlapping each other. The degree of overlap may vary according to requirement.
  • each element 10 has a length 12 of 10cm and a following element is longitudinally displaced from the preceding element by a distance 14 of about 1 cm.
  • Abutting elements in the overlapped configuration are then twisted together about a longitudinally extending axis to form a core 16 which is thereafter encapsulated in an insulating polymer sheath 18 to produce a finished cable product 20 ( Figure 3).
  • the cable product 20 has a conductive core 16 which has a resistance below a maximum target value of 1 ,5 ohms/m.
  • the degree of stretch which the cable product 20 can withstand, without losing conductivity depends on the lengths of the individual elements and the degrees of overlap between side by side elements in the assembly of elements in the core, subject to the polymer sheath 18 being capable of stretching without breaking. For example, a sample made from 3m long strands with a 90% overlap could be extended by over 100%.
  • FIG. 4 illustrates an alternative way of making a cable 24 according to the invention.
  • a core 26 is formed in a conventional manner by twisting continuous elongate strands 28 of copper wire around a longitudinal axis 30 as is known in the art.
  • the core 26 is then cut to a predetermined depth 32 at each of a plurality of spaced locations 34. The depth of each cut is sufficient to ensure that one or more, but not all, of the copper stands are severed.
  • the wires in the core are kept in close electrical contact with each other.
  • the processed core 26A is passed through an extruding machine 36 which applies a conductive sheath 38 of an appropriate polymer to the core.
  • the sheath 38 ensures that the strands 28 in the core 26A are kept together and provides an insulating function as is known in the art.
  • the polymer has appropriate properties which make it suitable for use at a blast site and additionally is chosen to ensure that it can elongate to a substantial extent without breaking.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Communication Cables (AREA)

Abstract

L'invention concerne un câble, qui comprend une gaine isolante, un cœur conducteur d'une première longueur enfermé à l'intérieur de la gaine, et un cœur comprenant une pluralité d'éléments allongés conducteurs, chaque élément ayant une longueur qui est inférieure à la première longueur, les éléments étant assemblés en contact conducteur les uns avec les autres sur la première longueur.
PCT/ZA2018/050012 2017-02-28 2018-02-28 Câble de raccordement de détonateur étirable Ceased WO2018161099A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA201902632A ZA201902632B (en) 2017-02-28 2019-04-25 Stretchable detonator connection cable
AU2019100494A AU2019100494A4 (en) 2017-02-28 2019-05-07 Stretchable detonator connection cable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2017/01486 2017-02-28
ZA201701486 2017-02-28

Related Child Applications (1)

Application Number Title Priority Date Filing Date
AU2019100494A Division AU2019100494A4 (en) 2017-02-28 2019-05-07 Stretchable detonator connection cable

Publications (1)

Publication Number Publication Date
WO2018161099A1 true WO2018161099A1 (fr) 2018-09-07

Family

ID=61683966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2018/050012 Ceased WO2018161099A1 (fr) 2017-02-28 2018-02-28 Câble de raccordement de détonateur étirable

Country Status (2)

Country Link
WO (1) WO2018161099A1 (fr)
ZA (1) ZA201902632B (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013104862U1 (de) * 2013-10-30 2013-12-02 Peter Palmer Ausziehbares Kabel
WO2015174505A1 (fr) * 2014-05-16 2015-11-19 国立研究開発法人産業技術総合研究所 Circuit électro-conducteur extensible et son procédé de fabrication
WO2015187841A1 (fr) * 2014-06-04 2015-12-10 Battelle Memorial Institute Fil ayant un trajet de conduction continu sous l'effet d'un allongement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013104862U1 (de) * 2013-10-30 2013-12-02 Peter Palmer Ausziehbares Kabel
WO2015174505A1 (fr) * 2014-05-16 2015-11-19 国立研究開発法人産業技術総合研究所 Circuit électro-conducteur extensible et son procédé de fabrication
WO2015187841A1 (fr) * 2014-06-04 2015-12-10 Battelle Memorial Institute Fil ayant un trajet de conduction continu sous l'effet d'un allongement

Also Published As

Publication number Publication date
ZA201902632B (en) 2019-11-27

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