EP0250737B1 - Time fuze for blasting - Google Patents

Time fuze for blasting Download PDF

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Publication number
EP0250737B1
EP0250737B1 EP87105426A EP87105426A EP0250737B1 EP 0250737 B1 EP0250737 B1 EP 0250737B1 EP 87105426 A EP87105426 A EP 87105426A EP 87105426 A EP87105426 A EP 87105426A EP 0250737 B1 EP0250737 B1 EP 0250737B1
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EP
European Patent Office
Prior art keywords
delay
tube
valve
hose
explosive
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.)
Expired - Lifetime
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EP87105426A
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German (de)
French (fr)
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EP0250737A1 (en
Inventor
Hans Dr. Florin
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Dynamit Nobel AG
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Dynamit Nobel AG
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Priority to IN72/MAS/87A priority Critical patent/IN169203B/en
Application filed by Dynamit Nobel AG filed Critical Dynamit Nobel AG
Priority to AT87105426T priority patent/ATE53655T1/en
Publication of EP0250737A1 publication Critical patent/EP0250737A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/34—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by a blocking-member in the pyrotechnic or explosive train between primer and main charge
    • 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
    • F42B3/16—Pyrotechnic delay initiators

Definitions

  • the invention relates to a detonator according to the preamble of claim 1 (see GB-A 1516031).
  • Detonators are used to detonate various charges in a specific order when blasting rocks or mining. Each detonator contains a delay device that delays the ignition of the charge by a precisely defined delay time. Electrical detonators are initiated by electrically igniting a squib. An electrical detonator detonator forms a "closed system" in which all pyrotechnic components are surrounded by a metallic sleeve.
  • non-electrical detonators which are connected to an ignition transmission hose.
  • the problems associated with the energy transmission device can be found, for example, in DE 30 25 703 C2. Threads made of a reactive material run in the tube. If these threads are ignited at one end of the hose, a self-sustaining pilot flame is created in the hose, combined with a shock wave, which means that flame-sensitive substances can be ignited at the other end of the hose.
  • the hose transmits the ignition flame to the detonator and first causes a pyrotechnic delay set to burn, which determines the individual delay time of the detonator. Since the hose extends into the sleeve of the detonator, the detonator forms an "open system". Such an open system has the disadvantage that the pressure building up in the sleeve can discharge indefinitely through the hose, so that the desired defined delay time cannot be achieved. Detonators according to the open system therefore have a wide range of delays.
  • the invention has for its object to provide a non-electric detonator according to the preamble of claim 1, which causes a defined ignition delay with a small spread and is equivalent to the electrical detonator.
  • a check valve is arranged between the interior of the hose and the delay device, which only opens when the pressure in the hose is greater than the pressure in the sleeve. If the pilot flame has penetrated into the sleeve, so that the ignition has continued into the sleeve, then an overpressure arises due to gas formation in the sleeve, as a result of which the check valve closes. From this point on, the detonator will operate with a "closed system", i.e. there is a defined pressure build-up and a defined propagation of the ignition through the delay device without pressure being able to escape into the hose.
  • the advantage of the non-electrical detonator according to the invention lies in the fact that very small spreads in the delay times are achieved.
  • the uniformity achieved with this, with which the detonator detonators of each time step ignite, is of crucial importance for a good detonation result.
  • the delay set burns in a closed room, whereby no pressure and gas relief can take place via the hollow open hose. This means that a defined delay time is strictly observed.
  • the invention is based on the idea that the part of the detonator igniter containing the delay device is closed off by the check valve with respect to the cavity of the hose as soon as the pilot flame has been transmitted.
  • the check valve opens only in the short time of the ignition phase (a few milliseconds) and then closes again, so that the delay device burns off under the defined and constant conditions of a closed volume.
  • the detonator shown in FIGS. 1 and 2 has a cylindrical sleeve 10 closed at the lower end, into the other end of which the hose 11 leads.
  • the hose 11 is an ignition transmission hose (e.g. "signal tube” manufactured by ATLAS Powder Company).
  • the end part of the hose 10 is surrounded in the interior of the sleeve 10 by a sealing plug 12 which is fastened to the sleeve by crimping and effects a seal between the hose and the sleeve.
  • the lower part of the sleeve 10 contains the underload 13 (secondary explosive).
  • the delay device 14 is located above the undercharge.
  • This has a tube 15 which contains in its upper part the delay set 16 which determines the delay time and in its lower part an initial charge 17 (initial explosive) for igniting the underload 13.
  • the sealing plug 12 which is made of elastomer material, encloses the end of the hose 11 in the interior of the sleeve 10.
  • the front end of the sealing plug 12 forms a check valve 18 in the form of the slotted valve shown in detail in FIG.
  • the end wall of the plug 12 is hemispherical, i.e. arched towards the inside of the sleeve.
  • the channel 19 for receiving the hose 11 ends, as shown in FIG. 2a, on the end-side bottom wall 20.
  • a slot 21 extends axially from the bottom wall 20 through the end wall of the sealing plug 12.
  • FIG. 2b shows an end view of the sealing plug when the slot 21 is closed.
  • the slot 21 Due to the elasticity of the sealing plug, the slot 21 is kept closed as long as there is no excess pressure inside the sealing plug or the hose 11. In the event of overpressure in the sealing plug 12, the slot edges are spread apart as shown in FIG. 2c, so that the slot 21 opens.
  • the tube 11 Since the tube 11 is open to the outside through its cavity, the pressure increase caused by the reaction in the tube is short-lived.
  • the overpressure in the hose drops back to normal pressure after about 5 ms, so that the slot 21 closes again after this time.
  • a gas overpressure remains in the intermediate space 22. Due to the hemispherical shape of the front end of the sealing plug 12 and the overpressure in the intermediate space 22, the check valve 18 closes, so that the delay set 16 burns in a closed space.
  • FIG. 3 shows another embodiment of the closure plug 12 forming the check valve 18.
  • the end wall of the closure plug here consists of a frustoconical region 23 adjoining the side wall and an adjoining cylindrical region 24.
  • the slot 21 runs through the regions 23 and 24 . Again, slot 21 is normally kept closed due to the elasticity of the plug material; the slot 21 opens according to FIG. 3c only if there is excess pressure inside the sealing plug 12.
  • FIG. 4 corresponds to that of FIGS. 1 and 2, with the exception of the fact that a pyrotechnic reactive substance 25 is arranged in a loose filling in the space 22 between the front end of the sealing plug 12 and the delay device 14.
  • This substance 25 has the task of transferring the ignition from the open slot of the check valve 18 to the delay set 16.
  • a mixture which generates a lot of heat but little gas is preferably considered as the pyrotechnic substance, so that the heat produced melts the surface of the check valve 18 and the valve slot is sealed even better by fusing.
  • the check valve 18 has an essentially rigid valve body 26 which projects with a tubular region 27 into the end of the hose 12 and is supported with its end wall 28 on the end of the hose 11 which is open at the end.
  • the sealing plug 12 ends flush with the tube 11 inside the sleeve 10.
  • radial outflow openings 29 are provided in the vicinity of the end wall 28.
  • the holes 29 are located in the interior of the hose 11, through which they are closed.
  • the valve body 26 moves axially into the intermediate space 22, the rear end still being guided inside the hose 11, while the end wall 28 abuts the transfer charge 30 resting on the delay device 14 (FIG. 6).
  • the transfer charge 30 is ignited with the check valve open through the openings 29 from the inside of the hose 11.
  • the transfer charge 30 is designed such that on the one hand it ignites the delay set 16 and on the other hand suddenly generates so much gas that the check valve 18 is closed again by pushing back the valve body 26 into the hose 11.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Check Valves (AREA)
  • Surgical Instruments (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Fishing Rods (AREA)

Description

Die Erfindung betrifft einen Sprengzeitzünder nach dem Oberbegriff des Patentanspruchs 1 (siehe GB-A 1516031).The invention relates to a detonator according to the preamble of claim 1 (see GB-A 1516031).

Sprengzeitzünder dienen dazu, bei der Sprengung von Felsen oder im Bergbau verschiedene Ladungen in bestimmter Reihenfolge zur Explosion zu bringen. Jeder Sprengzeitzünder enthält eine Verzögerungsvorrichtung, die das Anzünden der Ladung um eine genau definierte Verzögerungszeit verzögert. Elektrische Sprengzeitzünder werden durch das elektrische Anzünden einer Zündpille initiiert. Ein elektrischer Sprengzeitzünder bildet ein "geschlossenes System", bei dem alle pyrotechnischen Komponenten von einer metallischen Hülse abdichtend umgeben sind.Detonators are used to detonate various charges in a specific order when blasting rocks or mining. Each detonator contains a delay device that delays the ignition of the charge by a precisely defined delay time. Electrical detonators are initiated by electrically igniting a squib. An electrical detonator detonator forms a "closed system" in which all pyrotechnic components are surrounded by a metallic sleeve.

Bekannt sind ferner nicht elektrische Sprengzeitzünder, die mit einem Anzündübertragungsschlauch verbunden sind. Die mit der Energieübertragungseinrichtung verbundenen Probleme sind beispielsweise der DE 30 25 703 C2 zu entnehmen. In dem Schlauch verlaufen Fäden aus einem reaktionsfähigen Material. Werden diese Fäden an einem Schlauchende gezündet, dann entsteht in dem Schlauch eine sich selbst aufrechterhaltende Zündflamme, verbunden mit einer Schockwelle, wodurch am anderen Schlauchende flammempfindliche Stoffe angezündet werden können. Der Schlauch überträgt die Anzündflamme zu dem Sprengzeitzünder und bewirkt zunächst den Abbrand eines pyrotechnischen Verzögerungssatzes, der die individuelle Verzögerungszeit des Sprengzeitzünders bestimmt. Da der Schlauch in die Hülse des Sprengzeitzünders hineinragt, bildet der Sprengzeitzünder ein "offenes System". Ein solches offenes System hat den Nachteil, daß der sich in der Hülse aufbauende Druck sich teilweise undefiniert durch den Schlauch hindurch entladen kann, so daß die angestrebte definierte Verzögerungszeit nicht erzielbar ist. Sprengzeitzünder nach dem offenen System haben daher erhebliche Streubreiten der Verzögerungszeiten.Also known are non-electrical detonators which are connected to an ignition transmission hose. The problems associated with the energy transmission device can be found, for example, in DE 30 25 703 C2. Threads made of a reactive material run in the tube. If these threads are ignited at one end of the hose, a self-sustaining pilot flame is created in the hose, combined with a shock wave, which means that flame-sensitive substances can be ignited at the other end of the hose. The hose transmits the ignition flame to the detonator and first causes a pyrotechnic delay set to burn, which determines the individual delay time of the detonator. Since the hose extends into the sleeve of the detonator, the detonator forms an "open system". Such an open system has the disadvantage that the pressure building up in the sleeve can discharge indefinitely through the hose, so that the desired defined delay time cannot be achieved. Detonators according to the open system therefore have a wide range of delays.

Bei dem Sprengzeitzünder gemäß GB-A 1 516 031 wurde der Versuch unternommen, für die Sekundärladung ein "geschlossenes System" bereitzustellen. Das Pulver des Verzögerungssatzes ist dort in 5 relativ lange und dünne Röhrchen gepreßt worden. Die Röhrchen haben einen elliptischen Querschnitt, wodurch die Schlacke besser festgehalten werden soll. Durch diese Maßnahme ist aber nicht sicher zu erreichen, daß beim Zünden der Sekundärladung der diese enthaltende Raum gegenüber der Anzündseite durch die Schlacke in den Röhrchen abgedichtet wird und bleibt.In the detonator according to GB-A 1 516 031 an attempt has been made to provide a "closed system" for the secondary charge. The powder of the delay set has been pressed into 5 relatively long and thin tubes. The tubes have an elliptical cross section, which is intended to hold the slag better. However, this measure does not ensure that when the secondary charge is ignited, the space containing it is sealed against the ignition side by the slag in the tubes and remains.

Der Erfindung liegt die Aufgabe zugrunde, einen nicht elektrischen Sprengzeitzünder nach dem Oberbegriff des Patentanspruchs 1 zu schaffen, der eine definierte Zündverzögerung mit geringer Streubreite bewirkt und insoweit den elektrischen Sprengzeitzündem gleichwertig ist.The invention has for its object to provide a non-electric detonator according to the preamble of claim 1, which causes a defined ignition delay with a small spread and is equivalent to the electrical detonator.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den Merkmalen des kennzeichnenden Teils des Patentanspruchs 1. Nach der Erfindung ist zwischen dem Inneren des Schlauchs und der Verzögerungseinrichtung ein Rückschlagventil angeordnet, das nur öffnet, wenn der Druck im Schlauch größer ist als der Druck in der Hülse. Wenn die Zündflamme in die Hülse eingedrungen ist, so daß die Zündung sich bis in die Hülse hinein fortgesetzt hat, dann entsteht durch Gasbildung in der Hülse ein Überdruck, wodurch das Rückschlagventil schließt. Von diesem Zeitpunkt ab arbeitet der Sprengzeitzünder mit "geschlossenem System", d.h. es ergibt sich ein definierter Druckaufbau und eine definierte Fortpflanzung der Zündung durch die Verzögerungseinrichtung hindurch, ohne daß Druck in den Schlauch hinein entweichen kann. Der Vorteil des erfindungsgemäßen nicht-elektrischen Sprengzeitzünders liegt in der Erzielung sehr kleiner Streubreiten der Verzögerungszeiten. Die dadurch erzielte Gleichmäßigkeit, mit der die Sprengzeitzünder einer jeden Zeitstufe zünden, ist von entscheidender Bedeutung für ein gutes Sprengergebnis. Der Verzögerungssatz brennt in einem geschlossenen Raum ab, wobei keine Druck- und Gasentlastung über den hohlen offenen Schlauch erfolgen kann. Dadurch wird eine definierte Verzögerungszeit genau eingehalten. Mit der Erfindung ist es möglich, bei nicht-elektrischen Sprengzeitzündern ähnlich kleine Verzögerungsstreubreiten zu erhalten, wie sie sonst nur bei elektrischen Sprengzeitzündern mit geschlossenem System möglich sind. Der Erfindung liegt der Gedanke zugrunde, daß der die Verzögerungseinrichtung enthaltende Teil des Sprengzeitzünders durch das Rückschlagventil gegenüber dem Hohlraum des Schlauchs abgeschlossen wird, sobald die Zündflamme übertragen wurde. Das Rückschlagventil öffnet nur in der kurzen Zeit der Anzündungsphase (wenige Millisekunden) und schließt dann wieder, so daß die Verzögerungseinrichtung unter den definierten und gleichbleibenden Bedingungen eines abgeschlossenes Volumens abbrennt.This object is achieved according to the invention with the features of the characterizing part of claim 1. According to the invention, a check valve is arranged between the interior of the hose and the delay device, which only opens when the pressure in the hose is greater than the pressure in the sleeve. If the pilot flame has penetrated into the sleeve, so that the ignition has continued into the sleeve, then an overpressure arises due to gas formation in the sleeve, as a result of which the check valve closes. From this point on, the detonator will operate with a "closed system", i.e. there is a defined pressure build-up and a defined propagation of the ignition through the delay device without pressure being able to escape into the hose. The advantage of the non-electrical detonator according to the invention lies in the fact that very small spreads in the delay times are achieved. The uniformity achieved with this, with which the detonator detonators of each time step ignite, is of crucial importance for a good detonation result. The delay set burns in a closed room, whereby no pressure and gas relief can take place via the hollow open hose. This means that a defined delay time is strictly observed. With the invention, it is possible to obtain delay spread widths that are similarly small in the case of non-electrical detonator detonators, as are otherwise only possible in the case of electrical detonator detonators with a closed system. The invention is based on the idea that the part of the detonator igniter containing the delay device is closed off by the check valve with respect to the cavity of the hose as soon as the pilot flame has been transmitted. The check valve opens only in the short time of the ignition phase (a few milliseconds) and then closes again, so that the delay device burns off under the defined and constant conditions of a closed volume.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.Advantageous refinements and developments of the invention can be found in the subclaims.

Im folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Es zeigen:

  • Fig. 1 einen Längsschnitt durch eine erste Ausführungsform des Sprengzeitzünders,
  • Fig. 2 einen Längsschnitt des Rückschlagventils des Sprengzeitzünders von Figur 1 sowie eine Stirnansicht in geschlossenem und eine weitere Stirnansicht in geöffnetem Zustand des Ventils,
  • Fig. 3 in ähnlicher Darstellung wie Figur 2 eine andere Ausführungsform des Rückschlagventils,
  • Fig. 4 einen Sprengzeitzünder mit einer zusätzlichen pyrotechnischen Substanz zum Zuschweißen des Rückschlagventils nach dessem Wiederverschließen,
  • Fig. 5 ein drittes Ausführungsbeispiel des Sprengzeitzünders mit einem Rückschlagventil, das einen verschiebbaren Ventilkörper aufweist, bei geschlossenem Ventil und
  • Fig. 6 den Sprengzeitzünder nach Figur 5 bei geöffnetem Ventil.
Show it:
  • 1 shows a longitudinal section through a first embodiment of the detonator,
  • 2 shows a longitudinal section of the check valve of the detonator of FIG. 1 and an end view in the closed position and a further end view in the open state of the valve,
  • 3 in a representation similar to FIG. 2, another embodiment of the check valve,
  • 4 shows a detonator with an additional pyrotechnic substance for sealing the check valve after it has been reclosed,
  • Fig. 5 shows a third embodiment of the detonator with a check valve, which has a displaceable valve body, with the valve closed and
  • Fig. 6 shows the detonator according to Figure 5 with the valve open.

Der in den Figuren 1 und 2 dargestellte Sprengzeitzünder weist eine am unteren Ende geschlossene zylindrische Hülse 10 auf, in deren anderes Ende der Schlauch 11 hineinführt. Der Schlauch 11 ist ein Anzündübertragungsschlauch (z.B. "Signal-Tube", hergestellt von ATLAS Powder Company). Der Endteil des Schlauchs 10 ist im Inneren der Hülse 10 von einem Verschlußstopfen 12 umgeben, der durch Krimpen an der Hülse befestigt ist und eine Abdichtung zwischen Schlauch und Hülse bewirkt.The detonator shown in FIGS. 1 and 2 has a cylindrical sleeve 10 closed at the lower end, into the other end of which the hose 11 leads. The hose 11 is an ignition transmission hose (e.g. "signal tube" manufactured by ATLAS Powder Company). The end part of the hose 10 is surrounded in the interior of the sleeve 10 by a sealing plug 12 which is fastened to the sleeve by crimping and effects a seal between the hose and the sleeve.

Der untere Teil der Hülse 10 enthält die Unterladung 13 (Sekundärsprengstoff). Über der Unterladung befindet sich die Verzögerungseinrichtung 14. Diese weist ein Rohr 15 auf, das in seinem oberen Teil den die Verzögerungszeit bestimmenden Verzögerungssatz 16 und in seinem unteren Teil eine Initialladung 17 (Initialsprengstoff) zum Zünden der Unterladung 13 enthält.The lower part of the sleeve 10 contains the underload 13 (secondary explosive). The delay device 14 is located above the undercharge. This has a tube 15 which contains in its upper part the delay set 16 which determines the delay time and in its lower part an initial charge 17 (initial explosive) for igniting the underload 13.

Der aus Elastomermaterial bestehende Verschlußstopfen 12 umschließt im Inneren der Hülse 10 das Ende des Schlauchs 11. Das stirnseitige Ende des Verschlußstopfens 12 bildet ein Rückschlagventil 18 in Form des detailliert in Figur 2 dargestellten Schlitzventils. Die Stirnwand des Verschlußstopfens 12 ist halbkugelförmig ausgebildet, d.h. zum Hülseninneren hin gewölbt. Der Kanal 19 zur Aufnahme des Schlauchs 11 endet gemäß Figur 2a an der stimseitigen Bodenwand 20. Von der Bodenwand 20 erstreckt sich ein Schlitz 21 axial durch die Stimwand des Verschlußstopfens 12 hindurch. Figur 2b zeigt eine Stimansicht des Verschlußstopfens bei geschlossenem Schlitz 21. Infolge der Elastizität des Verschlußstopfens wird der Schlitz 21 geschlossen gehalten, solange kein Überdruck im Inneren des Verschlußstopfens bzw. des Schlauchs 11 auftritt. Bei einem Überdruck im Verschlußstopfen 12 werden die Schlitzränder gemäß Figur 2c auseinandergespreizt, so daß der Schlitz 21 sich öffnet.The sealing plug 12, which is made of elastomer material, encloses the end of the hose 11 in the interior of the sleeve 10. The front end of the sealing plug 12 forms a check valve 18 in the form of the slotted valve shown in detail in FIG. The end wall of the plug 12 is hemispherical, i.e. arched towards the inside of the sleeve. The channel 19 for receiving the hose 11 ends, as shown in FIG. 2a, on the end-side bottom wall 20. A slot 21 extends axially from the bottom wall 20 through the end wall of the sealing plug 12. FIG. 2b shows an end view of the sealing plug when the slot 21 is closed. Due to the elasticity of the sealing plug, the slot 21 is kept closed as long as there is no excess pressure inside the sealing plug or the hose 11. In the event of overpressure in the sealing plug 12, the slot edges are spread apart as shown in FIG. 2c, so that the slot 21 opens.

Der Sprengzeitzünder nach den Figuren 1 und 2 hat folgende Funktionsweise:

  • Die sich im Schlauch 11 fortsetzende Reaktion bewirkt einen Gasdruckanstieg, durch den das Rückschlagventil 18 geöffnet wird, so daß die Zündflamme aus dem Schlauch 11 durch den geöffneten Schlitz 21 und den leeren Zwischenraum 22 hindurch auf die Anzündfläche des Verzögerungssatzes 16 trifft. Dadurch wird der Anzündsatz 16 angezündet. Nach einer vorbestimmten Verzögerungszeit, deren Länge durch die Verzögerungseinrichtung 14 bestimmt ist, wird die Unterladung 13 zur Detonation gebracht.
The detonator according to Figures 1 and 2 has the following function:
  • The reaction which continues in the hose 11 causes an increase in gas pressure, by means of which the check valve 18 is opened, so that the pilot flame from the hose 11 hits the ignition surface of the delay set 16 through the opened slot 21 and the empty space 22. This ignites the ignition charge 16. After a predetermined delay time, the length of which is determined by the delay device 14, the undercharging 13 is detonated.

Da der Schlauch 11 durch seinen Hohlraum nach außen hin offen ist, ist der durch die Reaktion im Schlauch bewirkte Druckanstieg nur von kurzer Dauer. Der Überdruck im Schlauch fällt nach etwa 5 ms wieder auf Normaldruck ab, so daß der Schlitz 21 sich nach dieser Zeit wieder schließt. Im Zwischenraum 22 verbleibt ein Gasüberdruck. Durch die Halbkugelform des stirnseitigen Endes des Verschlußstopfens 12 und durch den Überdruck im Zwischenraum 22 schließt das Rückschlagventil 18, so daß der Verzögerungssatz 16 in einem geschlossenen Raum abbrennt.Since the tube 11 is open to the outside through its cavity, the pressure increase caused by the reaction in the tube is short-lived. The overpressure in the hose drops back to normal pressure after about 5 ms, so that the slot 21 closes again after this time. A gas overpressure remains in the intermediate space 22. Due to the hemispherical shape of the front end of the sealing plug 12 and the overpressure in the intermediate space 22, the check valve 18 closes, so that the delay set 16 burns in a closed space.

Figur 3 zeigt eine andere Ausführungsform des das Rückschlagventil 18 bildenden Verschlußstopfens 12. Die Stirnwand des Verschlußstopfens besteht hierbei aus einem sich an die Seitenwand anschließenden kegelstumpfförmigen Bereich 23 und einem sich daran anschließenden zylindrischen Bereich 24. Der Schlitz 21 verläuft durch die Bereiche 23 und 24 hindurch. Auch hierbei wird der Schlitz 21 infolge der Elastizität des Stopfenmaterials normalerweise geschlossen gehalten; nur wenn im Inneren des Verschlußstopfens 12 ein Überdruck auftritt, öffnet der Schlitz 21 gemäß Figur 3c.FIG. 3 shows another embodiment of the closure plug 12 forming the check valve 18. The end wall of the closure plug here consists of a frustoconical region 23 adjoining the side wall and an adjoining cylindrical region 24. The slot 21 runs through the regions 23 and 24 . Again, slot 21 is normally kept closed due to the elasticity of the plug material; the slot 21 opens according to FIG. 3c only if there is excess pressure inside the sealing plug 12.

Das Ausführungsbeispiel der Figur 4 entspricht demjenigen der Figuren 1 und 2, mit Ausnahme der Tatsache, daß in dem Zwischenraum 22 zwischen dem stirnseitigen Ende des Verschlußstopfens 12 und der Verzögerungseinrichtung 14 eine pyrotechnische reaktionsfähige Substanz 25 in lockerer Füllung angeordnet ist. Diese Substanz 25 hat die Aufgabe, die Anzündung vom geöffnetem Schlitz des Rückschlagventils 18 auf den Verzögerungssatz 16 zu übertragen. Als pyrotechnische Substanz kommt vorzugsweise ein Gemisch in Betracht, welches viel Wärme, jedoch wenig Gas erzeugt, so daß die produzierte Wärme die Oberfläche des Rückschlagventils 18 zum Schmelzen bringt und der Ventilschlitz durch Verschmelzung noch besser abgedichtet wird.The embodiment of FIG. 4 corresponds to that of FIGS. 1 and 2, with the exception of the fact that a pyrotechnic reactive substance 25 is arranged in a loose filling in the space 22 between the front end of the sealing plug 12 and the delay device 14. This substance 25 has the task of transferring the ignition from the open slot of the check valve 18 to the delay set 16. A mixture which generates a lot of heat but little gas is preferably considered as the pyrotechnic substance, so that the heat produced melts the surface of the check valve 18 and the valve slot is sealed even better by fusing.

Auch das Ausführungsbeispiel der Figuren 5 und 6 entspricht weitgehend dem ersten Ausführungsbeispiel, so daß die nachfolgende Beschreibung sich auf die Unterschiede beschränken kann. Das Rückschlagventil 18 weist gemäß Figuren 5 und 6 einen im wesentlichen starren Ventilkörper 26 auf, der mit einem rohrförmigen Bereich 27 in das Ende des Schlauchs 12 hineinragt und sich mit seiner Stirnwand 28 am stirnseitig offenen Ende des Schlauchs 11 abstützt. Der Verschlußstopfen 12 endet bündig mit dem Schlauch 11 im Inneren der Hülse 10. Im rohrförmigen Teil 27 sind in der Nähe der Stirnwand 28 radiale Ausströmöffnungen 29 vorgesehen.The exemplary embodiment in FIGS. 5 and 6 also largely corresponds to the first exemplary embodiment, so that the following description can be limited to the differences. According to FIGS. 5 and 6, the check valve 18 has an essentially rigid valve body 26 which projects with a tubular region 27 into the end of the hose 12 and is supported with its end wall 28 on the end of the hose 11 which is open at the end. The sealing plug 12 ends flush with the tube 11 inside the sleeve 10. In the tubular part 27, radial outflow openings 29 are provided in the vicinity of the end wall 28.

Im abgedichteten Zustand befinden sich die Löcher 29 im Inneren des Schlauchs 11, durch den sie verschlossen werden. Zum Öffnen des Rückschlagventils 18 bewegt sich der Ventilkörper 26 axial in den Zwischenraum 22 hinein, wobei das rückwärtige Ende noch innerhalb des Schlauchs 11 geführt ist, während die Stirnwand 28 gegen die an der Verzögerungseinrichtung 14 anliegende Ubertragungsladung 30 stößt (Figur 6). Die Übertragungsladung 30 wird bei geöffnetem Rückschlagventil durch die Öffnungen 29 hindurch vom Inneren des Schlauchs 11 her angezündet. Die Übertragungsladung 30 ist so ausgebildet, daß sie einerseits den Verzögerungssatz 16 anzündet und andererseits plötzlich so viel Gas erzeugt, daß hierdurch das Rückschlagventil 18 durch Zurückstoßen des Ventilkörpers 26 in den Schlauch 11 wieder geschlossen wird.In the sealed state, the holes 29 are located in the interior of the hose 11, through which they are closed. To open the check valve 18, the valve body 26 moves axially into the intermediate space 22, the rear end still being guided inside the hose 11, while the end wall 28 abuts the transfer charge 30 resting on the delay device 14 (FIG. 6). The transfer charge 30 is ignited with the check valve open through the openings 29 from the inside of the hose 11. The transfer charge 30 is designed such that on the one hand it ignites the delay set 16 and on the other hand suddenly generates so much gas that the check valve 18 is closed again by pushing back the valve body 26 into the hose 11.

Ferner ist es möglich, eine (nicht dargestellte) elastische Einrichtung vorzusehen, die den Ventilkörper 26 auf seinen Schließzustand hin vorspannt.It is also possible to provide an elastic device (not shown) which prestresses the valve body 26 towards its closed state.

Claims (6)

1. Explosive delay detonator with a casing (10), which contains behind one another a base charge (13) and a delay arrangement (14) and into one end of which an ignition transmission tube (11) leads through a sealing plug (12), with a detonation flame emerging from the ignition transmission tube (11) being transmitted to the delay arrangement (14), which, for its part brings the base charge (13) to detonation after a predetermined delay time, characterised in that a non-return valve (18) allowing passage only in the direction from the tube (11) to the delay arrangement (14) is arranged between the inside of the tube (11) and the delay arrangement (14).
2. Explosive delay detonator according to claim 1, characterised in that the non-return valve (18) consists of an elastic slit valve pre-formed as one piece with the sealing plug (12), which valve engages around the open end of the tube, in the interior of the casing (10).
3. Explosive delay detonator according to claim 2, characterised in that there is arranged between the slit valve and the delay arrangement (14) a pyrotechnic substance (25) which is caught by the detonation flame and, on burning away, welds tight the closed slit valve.
4. Explosive delay detonator according to claim 1, characterised in that the non-return valve (18) has a valve body (26) which is displaceable in the longitudinal direction of the tube end.
5. Explosive delay detonator according to claim 4, characterised in that the valve body (26) is elastically biased for closing the tube (11).
6. Explosive delay detonator according to claim 4, characterised in that between the non-return valve (18) and the delay arrangement (14) is arranged an ignition transmission charge (30).
EP87105426A 1986-04-26 1987-04-11 Time fuze for blasting Expired - Lifetime EP0250737B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IN72/MAS/87A IN169203B (en) 1986-04-26 1987-02-04
AT87105426T ATE53655T1 (en) 1986-04-26 1987-04-11 DETONATION TIME DETONATOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614204 1986-04-26
DE19863614204 DE3614204A1 (en) 1986-04-26 1986-04-26 Explosive detonators

Publications (2)

Publication Number Publication Date
EP0250737A1 EP0250737A1 (en) 1988-01-07
EP0250737B1 true EP0250737B1 (en) 1990-06-13

Family

ID=6299614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105426A Expired - Lifetime EP0250737B1 (en) 1986-04-26 1987-04-11 Time fuze for blasting

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US (1) US4809610A (en)
EP (1) EP0250737B1 (en)
JP (1) JPS62258999A (en)
BR (1) BR8701963A (en)
CA (1) CA1282639C (en)
DE (2) DE3614204A1 (en)
ES (1) ES2015912B3 (en)
GR (1) GR3000767T3 (en)
ZA (1) ZA872932B (en)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
US4957027A (en) * 1989-10-02 1990-09-18 The United States Of America As Represented By The Secretary Of The Navy Versatile nonelectric dearmer
US5036588A (en) * 1989-10-02 1991-08-06 The United States Of America As Represented By The Secretary Of The Navy Nonvolatile, fast response wire cutter
NO905331L (en) * 1990-01-30 1991-07-31 Ireco Inc Delay detonator.
US5031538A (en) * 1990-02-07 1991-07-16 The Ensign-Bickford Company Delay train ignition buffer
US5086702A (en) * 1990-04-12 1992-02-11 Atlas Powder Company Modular blasting system
AT396302B (en) * 1991-06-13 1993-08-25 Schaffler & Co NON-ELECTRIC IGNITION
US5594196A (en) * 1995-04-20 1997-01-14 Ireco, Inc. Shock tube surface connector
US5927312A (en) * 1998-02-27 1999-07-27 Dryden; Paul E. Method and apparatus for extinguishing combustion within combustible tubing
FR2797947B1 (en) * 1999-08-24 2001-11-16 Francesco Ambrico PYROTECHNIC DEVICE FOR CONNECTION AND DELAY
SE516812C2 (en) 1999-09-06 2002-03-05 Dyno Nobel Sweden Ab Explosive capsule, procedure for ignition of base charge and initiation element for explosive capsule
JP4791645B2 (en) * 2001-04-05 2011-10-12 カヤク・ジャパン株式会社 Detonator delay device

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CA749682A (en) * 1967-01-03 Prior Josef Detonation interrupter with valve action
US704465A (en) * 1901-10-22 1902-07-08 Wassily Kirsanov Blasting-cartridge.
FR563121A (en) * 1922-05-02 1923-11-27 Air Liquide Device for fixing the ignition transmission unit to the cartridges
US3368485A (en) * 1966-04-08 1968-02-13 Robert L. Klotz Nonexplosive detonating fuse directional interrupter
DE2452080C3 (en) * 1974-11-02 1979-12-06 Pyrotechnische Fabriken Hans Moog-H. Nicolaus, 5630 Remscheid-Luettringhausen Fireworks
GB1516031A (en) * 1977-02-02 1978-06-28 Ici Ltd Delay ignition transmission assembly
DE3123250A1 (en) * 1981-06-11 1983-01-05 Friedrich Wilhelm Dipl.-Kfm. 4600 Dortmund Sobbe Detonating-fuse closure
US4664033A (en) * 1985-03-22 1987-05-12 Explosive Technology, Inc. Pyrotechnic/explosive initiator

Also Published As

Publication number Publication date
GR3000767T3 (en) 1991-10-10
CA1282639C (en) 1991-04-09
ZA872932B (en) 1987-10-19
JPS62258999A (en) 1987-11-11
DE3763249D1 (en) 1990-07-19
US4809610A (en) 1989-03-07
ES2015912B3 (en) 1990-09-16
BR8701963A (en) 1988-02-02
EP0250737A1 (en) 1988-01-07
DE3614204A1 (en) 1987-10-29

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