JPS62259000A - Delayed blasting detonator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a delayed blasting detonator equipped with a cartridge, wherein the cartridge carries a lower charge (secondary explosive) and a delay device one after the other. A conductive hose for ignition is inserted at one end O of the cartridge, and the reaction progressing within the ignition conduit hose acts on the time delay device 2 when it reaches the end of the hose, The delay device itself is of the type that causes the lower charge to detonate after a predetermined delay time.

Prior Art Delayed blast detonators are used to detonate charges in a predetermined sequence during rock blasting and in mining operations. Each delayed blasting cap contains a time delay device that delays the ignition of the charge by a precisely defined delay time. Electric delayed blast detonators are detonated by electrical ignition of a sparkball. Electric delayed blast detonators form a closed system in which all pyrotechnic components are hermetically sealed in a metal cartridge.

Non-electrical delayed blast detonators are also known which are connected to conductive ignition hoses.

A fuse consisting of a reactive substance extends within the ignition conductive hose. When the fuse is ignited at one end of the fuse hose, a self-sustaining ignition flame accompanied by radio waves is generated within the fuse hose, so that at the other end of the fuse hose, An explosive that is sensitive to flame is ignited. The pilot hose directs the ignition flame to the late blasting detonator to first burn the carpenter delay charge, which determines the individual delay time of the late blasting detonator. Since the fuse hose has penetrated into the cartridge of the delayed blasting detonator, the late blasting detonator has one "open system" (
open system). The disadvantage of such open systems is that the pressure built up in the cartridge is partially released through the fuse hose in an unregulated or uncontrollable manner, making it impossible to obtain a well-defined delay time. have. Therefore, open type delayed blasting detonators have a significant variation in delay time.

Problems to be Solved by the Invention The problem to be solved by the present invention is to improve the non-electrical delayed blast detonator of the type mentioned at the beginning, and to solve the problem of dispersion of the delay time by burning the time delay device in a closed system. The goal is to make the width of the gap very small.

Means for Solving the Problems The constituent means of the present invention for solving the above-mentioned problems is that a sealing wall having a sealing action is disposed between the hose end of the ignition conductive hose and the time delay device, and the sealing wall has a sealing effect. On the side of the stop wall facing the time delay device, an auxiliary charge is distributed which is ignited and burned while maintaining a sealing effect by impact armor or thermal action, and ignites at the time delay device. At the point.

Operation In the delayed blast detonator according to the present invention, the chamber of the cartridge containing the delay device and the lower charge is pressure-tightly isolated from the ignition conductive hose by a sealing wall, and this isolation prevents the combustion of the delay device. It is also maintained inside. The transmission of the ignition from the ignition conductive hose to the delay device takes place by impact or heat action through the sealing wall. Whereas conventional non-electric delayed blast detonators form an open system and create pressure relief and gas escape through a hollow conductive ignition hose during combustion of the delay device, the present invention In this case, a sealing wall is provided which has a sealing effect and creates a closed system. As a result, the time delay device burns under defined pressure conditions, resulting in reproducible delay times with very small variations.

A further advantage is that the delayed blast detonator of the present invention provides the same average delay time as a closed system electrical delayed blast detonator when using the same delay device. In that case, the average value of the delay time depends on the strength of the auxiliary charge and the volume between the auxiliary charge and the delay device. Another advantage is that the delay time is independent of the outlet output of the ignition conductive hose, and therefore independent of variations in manufacturing tolerances of the ignition conductive hose.

The transmission of the ignition from the conductive ignition hose to the delay device can be carried out by means of an igniter detonator which is detonated by impact by impact transmission through the sealing wall, or by means of a heat-sensitive charge by heat conduction through said sealing wall. It can be done by

Advantageous embodiments of the invention are apparent from the dependent claims.

Example Embodiments of the invention will now be described in detail with reference to the drawings.

The delayed blast detonator shown in FIG.
1 is included. The ignition conductive hose 11 is made of a plastic hose, and a fuse made of a reactive substance is housed in the hollow chamber of the hose, and the chemical reaction of the fuse generates a self-sustaining ignition flame accompanied by fE zero waves. The ignition flame ignites a flame-sensitive explosive at the outlet of the fuse hose. This kind of conductive hose for ignition is ATLAS
“Signa” from Powder Comp-any
1-Tube".The end of the conductive hose for ignition, which is inserted into the cartridge 10, is enclosed by a plug 12 made of a nystomer material, and the plug is a tube tube. The end face of the plug 12 is aligned with the end face of the conductive ignition hose 11 inside the cartridge 10.

A lower charge (secondary explosive) 13 is disposed in the lower region of the cartridge 10, and above the lower charge a time delay device 14 consisting of a tube piece 15 containing a time delay charge 16 is provided. ing.

An auxiliary charge in the form of an ignition tube 17 is supported on the upper surface of the upper end of the time delay device 14 . The ignition detonator 17 has penetrated into a recessed portion 18 provided on the lower surface of the sealing wall 19, and the above-mentioned sealing! 119 is placed in direct contact with the end surfaces of the plug 12 and the conductive hose 11 for ignition. A transfer charge 21 is arranged in another recessed portion 20 provided on the upper surface of the sealing Y19, and the transfer charge is ignited by the ignition flame ejected from the end of the conductive hose 11 for ignition. In the embodiment shown in FIG. 1, an axial gap 22 is provided between the sealing wall 19 and the delay device 14. In the embodiment shown in FIG. That is, it protrudes downward beyond the concave portion 18 of the ignition detonator 17Fi. The sealing wall 19, which seals the lower cavity of the cartridge 10 against the ignition conductive hose 11, is made of a rigid material that does not substantially deform during explosion of the transfer charge 21.

The functional aspects of the delayed blast detonator shown in FIG. 1 are as follows.

The reaction progressing through the ignition conductive hose 11 generates an ignition flame inside the cartridge 10 at the outlet of the ignition conductive hose, and the ignition flame consists of a transfer charge. The sealing wall 19 is moved to the time delay device 14 by energy conversion.
As a result, the ignition cap 17 is ignited. In this case, the sealing effect of the sealing wall 19 is maintained. The delay charge 16 is ignited by the ignition of the ignition detonator 17, and this is because after a predetermined combustion time has elapsed, the charge 23 located at the end of the delay section is ignited through the stop 16a. The detonator itself is the lower charge 13
ignites. Due to the fact that the delay device 14 burns in a closed space, the non-electrical delayed blasting detonator has exactly the same variation width as the closed '1°C pneumatic delayed blasting detonator. An extremely small delay time can be obtained.

This is clear based on the following table IK, which lists the average values and variation ranges of the measured delay times.

Table ■ The delayed blasting detonators whose actual measurement results are listed in the table above were all equipped with delay bodies of the same production quantity. The average value of the delay time of the delay element was 2f; 14m5 for a closed electric delayed blasting detonator.

The embodiment shown in FIGS. 2 to 5 essentially corresponds to the embodiment shown in FIG. 1, so that only the differences from FIG. 1 will be explained below.

According to FIG. 2, the ignition detonator 17 containing the auxiliary charge is arranged in the recessed part of the delay device fi14, and the sealing wall 19 is located in the space between the delay device fl14 and the plug 12. is completely filled in the axial direction. The bottom of the recessed portion 20 in the upper part of the sealing wall 19 forms a deformed portion IG)a, and the core deformed portion bulges downward when the transfer charge 21 is detonated, but does not open. When the transfer powder 21 detonates, the deformed portion 19a hits the ignition tube 17 supported by the tube piece 15, and based on this, the ignition tube 17 is ignited and the delay charge 16 is ignited.

In the embodiment shown in FIG. 3, the Fi ignition tube 17 is arranged in the recess 18 of the sealing wall 19, as in the case of FIG. The ignition detonator 17 is supported on the delay device 114 and presses the sealing wall 19 onto the plug 12. A firing pin 24 is guided within the end of the conductive ignition hose 11, and the firing pin is accelerated downward by the gas pressure generated within the conductive ignition hose 11, and the spherical needle head engages the sealing wall 19. , thereby igniting the ignition tube 17. Sealing wall 19 and firing pin 24 are configured such that firing pin 24 only moves a limited stroke length Kbfc. This stroke length is designed to such an extent that the sealing wall 19 is not penetrated. In the embodiment shown in FIG. 3, the deformed portion 19a of the sealing wall 19 is time-delayed by the firing pin 24! 114.

The embodiment shown in FIG. 4 is similar to the embodiment shown in FIG. be equivalent to. Firing pin 24
The stroke of the ignition cap 17 and the ignition cap 17 are coordinated so that the ignition cap closes to 1 when the firing pin strikes. The ignition detonator 17 is fitted into the recessed portion 18 by adhesive or press fitting so as to seal the lower portion of the sealing wall 19.

This sealing is maintained even after the ignition detonator 17 is ignited.

The embodiment shown in FIG. 5 is similar to the embodiment shown in FIG. It corresponds to The sealing wall 19 is not substantially deformed during combustion of the transfer charge 21, but is merely heated, and the heat is transferred to the heat-sensitive charge 26 by thermal conduction, whereby the heat-sensitive charge is ignited. ,
And it itself ignites the time delay medicine 16.

The sealing wall 19 in this case consists of a material with good thermal conductivity.

In embodiments using a transfer charge 21, the transfer charge may be covered with a thin foil, for example made of aluminum, in order to protect against ambient loads, moisture and to avoid external spillage; destroyed by the ignition beam of the conductive hose 11.

Such a foil covering the transfer charge 21 is for the electrostatic safety of the delayed blasting primer (i.e. in order to prevent it from reacting sensitively to electrostatic discharge and igniting).
extremely important.

If an electrical spark discharge occurs from the ignition conductive hose into the interior of the blasting cap, spark discharge to the transfer charge 21 must be absolutely avoided. By covering the transfer charge with a metal foil that is conductively connected to the sealing wall 19, the transfer charge is shielded as if it were a Faraday screen, so that the spark discharge from the ignition conductive hose does not reach the sealing wall surface or the seal. It never reaches into the stop wall and ignites the transfer charge.

In FIG. 6, the transfer powder coating takes place by means of a metal cylinder 27 with a very thin-walled bottom 28. in this case,
The bottom portion 28 of the cylindrical body 27 is so thin that it is destroyed by the ignition beam of the ignition conductive hose.

In addition, in FIG. 7, the coating of the transfer powder 21 is made of a non-gold M sheet 2
9 (e.g. paper sheet). Such a non-conductive sheet is attached to an electrically conductive holder 3 (for example made of metal).
o, the ignition conductive hose 11 must be held so as not to sit on the sheet 29.

The hole 31 in the holder 3o through which the ignition beam passes must be smaller and stronger than the recess 20 in which the transfer charge 21 is accommodated. This causes the conductive hose 11 for ignition.

always produces an electrical spark discharge on the holder 30 and never on the coating sheath) 29t- through the transfer powder 21.
It is guaranteed that no intrusion will occur.

If the sealing wall 19 is rigid and acts on the ignition cap 17 by shock transmission, it must be made of a hard material that conducts shock waves well, such as hard plastic, glass or ceramic. Further, when the sealing wall 19 has a deformed portion, the sealing wall is made of metal or plastic.

It is also possible to use a diaphragm-like sealing wall that is thin enough to be deformed by pressure waves propagating within the ignition conductive hose, and to ignite the ignition cap by deformation of the nuclear sealing wall.

Effects of the Invention By means of the construction of the invention, the time delay device 14 burns in a closed system in which no gas and pressure escape into the ignition conductive hose 11, and thus in a non-electrical blasting system.
The variation width of the delay time of the tube is also significantly reduced. This increases the reliability of work and significantly improves safety in terms of disaster prevention, so it has extremely great industrial utility value.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the first preferred embodiment of a delayed blast detonator with an ignition cap built into the sealing wall, and Figure 2 is a longitudinal cross-sectional view of a first preferred embodiment of a delayed blast detonator with an ignition primer built into the delay device. A vertical cross-sectional view of the second embodiment,
Fig. 3 is a longitudinal sectional view of a third embodiment of a delayed blasting detonator equipped with a firing pin that strikes the sealing wall 7 times, and Fig. 4 is a delayed blasting detonator equipped with a firing pin that directly strikes the ignition cap. A vertical cross-sectional view of the fourth embodiment of the tube, Figure @5 is a vertical cross-sectional view of the fifth embodiment of the delayed blast detonator in which heat is transferred through the sealing wall, and Figure 6 is a longitudinal cross-sectional view of the fifth embodiment of the delayed blast detonator that conducts heat through the sealing wall. FIG. 7 is a longitudinal sectional view of a sixth embodiment of a delayed blast detonator with a cover, and FIG. 7 is a longitudinal sectional view of a seventh embodiment with a non-conductive foil covering the transfer charge. 10... cartridge, 11... conductive hose for ignition, 12.
...Occupation plug, 13...Lower charge (secondary explosive), 14.
... Time delay device, 15... Tube piece, 16... Time delay medicine, 1
6a... Time delay section, 17... Ignition detonator, 18...
- Recessed part, 19... Sealing wall, 19a... Deformed part,
20... Recessed portion, 21... Transfer charge, 22... Axial gap, 23... Explosive charge, 24... Firing pin, 25...
・Opening, 26... Heat-sensitive charge, 27... Cylindrical body, 28
... Bottom, 29 ... Non-metallic non-conductive sheet, 3
0... Conductive holding body, 31... Hole.

Claims (1)

[Scope of Claims] 1. A delayed blast detonator equipped with a cartridge (10), wherein the cartridge accommodates a lower charge (13) and a time delay device (14) one after the other, and Attach a conductive hose for ignition to one end of the cartridge (1
1) has entered the ignition conductive hose, and the reaction progressing within the ignition conductive hose acts on the time delay device (14) when it reaches the end of the hose, and the time delay device itself is activated after a predetermined delay time. In the type in which the lower charge (13) is detonated, a sealing wall (19) having a sealing function is arranged between the hose end of the ignition conductive hose (11) and the time delay device (14). and the sealing wall (19);
On the side facing the time delay device (14), there is an auxiliary charge (17) which is ignited and burned while maintaining a sealing effect by impact or heat action to ignite the time delay device (14).
;26) is arranged. 2. Delayed blast detonator according to claim 1, wherein the sealing wall (19) consists of a continuous plate without perforations. 3. The sealing wall (19) has a deformable portion (19a), and the auxiliary charge is supported on the delay device (14) and is subjected to the deforming action of the deformable portion (19a). 1
7) A delayed blast detonator according to claim 2, which is configured as follows. 4. The sealing wall (19) has a recessed portion (20) on the side facing the ignition conductive hose (11), and the transfer charge (21) is disposed within the recessed portion. A delayed blast detonator according to claim 1. 5. Transfer powder (2) placed within the metal sealing wall (19)
1) is covered with a conductive covering (28), and the covering (28) is connected to the sealing wall (19) and the cartridge (
10) A delayed blast detonator according to claim 4, which is electrically conductively coupled with 10). 6. Transfer powder (2) placed within the metal sealing wall (19)
1) is covered with a non-conductive sheet (29), and a holder (30) made of a conductive material having holes (31) is connected to the ignition hose (11) and the sheet (29).
9), and the cross section of the hole (31) is smaller than the cross section of the recess (20) that accommodates the transfer powder (21). Delayed blast detonator described in section. 7. The firing pin (24) according to claim 1 or 3, which is provided with a firing pin (24) that is struck against the sealing wall (19) by a shock wave propagating within the ignition fuse hose (11). Delayed blast detonator. 8. The sealing wall (19) has an opening (25), the ignition detonator (17) is fixed behind the opening so as to seal the opening, and the ignition fuse hose (11 2. A delayed blast detonator according to claim 1, further comprising a firing pin (24) which is directly struck by the shock wave propagating within the ignition cap (17). 9. The auxiliary charge (26) is arranged behind the sealing wall (19) and consists of a heat-sensitive charge that is ignited and combusted by heat conduction passing through the sealing wall (19). A delayed blast detonator according to claim 2 or 4, wherein 10. The delayed blast detonator according to claim 1 or 4, wherein the sealing wall (19) is made of metal. 11. The delayed blast detonator according to claim 1 or 4, wherein the sealing wall (19) is made of plastic. 12. Delayed blast detonator according to claim 2, wherein the sealing wall (19) consists of glass or ceramic material.