JPH0792359B2 - Electronic delay electric detonator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric detonator having an electronic delay ignition device, and more particularly to an electronic delay ignition device including an electronic delay circuit board and an energy storage capacitor. The present invention relates to a compact electronic delay electric detonator which is integrally combined with and is enclosed in a cylindrical casing.

(Prior Art) An electronic delay electric detonator is disclosed in U.S. Pat. No. 4,145,970,
U.S. Pat.No. 4,240,350, U.S. Pat.No. 4311096, U.S. Pat.No. 4,445,435, U.S. Pat.No. 4,487,125, U.S. Pat.No. 4,586,437 and U.S. Pat.
It is disclosed in the specification of 2477 and the like. This electronic delay electric detonator is a combination of an electric detonator enclosing a bridge type ignition means and an electronic delay ignition device composed of an electric energy storage capacitor (hereinafter, storage capacitor) and an electronic delay circuit board. is there. If the electronic delayed ignition device can be enclosed in the electric detonator tube as one unit device, the electronic delayed ignition device can be remarkably miniaturized. Such an approach has been described in U.S. Pat.
No. 0, US Pat. No. 4311096, US Pat. No. 4586437 and the like. However, in the case where the entire electronic delayed ignition device is built into the electric detonator tube, it is difficult to be commercially established due to the remarkable limitation due to the capacity of the storage capacitor. More specifically, when the capacitance of the storage capacitor is 100 to 1.000 pF and the withstand voltage is 10 V or higher, the outer diameter of the storage capacitor increases, and the volume is reduced while maintaining the desired electrical performance of the capacitor. Then, the internal resistance increases and the temperature sensitivity is significantly reduced. Thus, the spatial volume of the storage capacitor becomes so high that it is technically and economically difficult to encapsulate it safely and without damage in the electric detonator body together with any electronic delay circuit board.

Therefore, as described in U.S. Pat.No. 4,712,477, an electronic delay electric detonator having a structure in which a separate electronic delay ignition device is integrated with an electric detonator and the whole is enclosed in a cylindrical casing has been proposed. .

(Problems to be Solved by the Invention) In an electronic delay electric detonator in which an electronic delay ignition device and an electric detonator are enclosed in a cylindrical casing, the cylindrical casing prevents super-explosive force of the electric detonator. must not. The tubular casing is for preventing damage to the electronic delayed ignition device. On the other hand, it is also necessary for manufacture to assemble the electronic delayed ignition device and the electric detonator as one unit and to enclose the electronic detonator in a cylindrical casing without damaging the unit. For example, the electrical connection between the electric detonator, the electronic delay circuit board, and the storage capacitor has a problem that the connection is disconnected due to transportation vibration and shock. That is, the combination of the electric detonator, the electronic delay circuit board, and the storage capacitor is
It is desired that the electronic circuit board itself has a function of protecting and holding the electronic circuit board.

(Means for Solving Problems) The inventors of the present invention do not have the above-mentioned problems, are inexpensive and compact, and furthermore, connect the electronic delay circuit board, the storage capacitor, and the electric detonator mechanically and electrically. As a result of various studies for the purpose of obtaining a casing-enclosed electronic delay electric detonator having a structure that can be achieved safely and surely, an electric detonator, an electronic delay circuit and a storage capacitor which are separate from the electric detonator, By arranging these members in series along the longitudinal direction of the electric detonator body and sealing the whole into a rigid plastic cylindrical casing to form an electronic delay electric detonator, damage is prevented. In addition, it is possible to provide an electronic delay electric detonator that has a structure that does not artificially reduce the detonation force of the electric detonator and has a structure that can be achieved mechanically and electrically safely and reliably. The inventors have found that

That is, the present invention is as follows.

1. A sealing plug having a lead wire inserted through the opening end; and an electric detonator in which a bottomed cylindrical body tapered toward the bottom and an electric ignition means together with detonator at the bottom are sealed with an embolus. An electronic delayed ignition device in which an electronic delay circuit board electrically connected to a leg of the ignition means and an energy storage capacitor are sequentially arranged in series at the opening side; the detonator tube body and the electronic delayed ignition device; And a tubular casing that is sealed together with the sealing plug, wherein the tubular casing has an elastic modulus of 0.
^{5 × 10 4 ~3.0 × 10 4} kg / cm 2, bending strength 20~2000kg / cm ² of the mechanical properties made from a hard plastic having a thickness T of the side surface is not more 0.5mm or more, the bottom wall thickness t An electronic delay electric detonator characterized by a structure that satisfies t / T ≦ 1.

2. The thickness t of the bottom wall of the tubular casing is equal to the thickness T of the side surface.
50% to 90% of the electronic delay electric detonator according to the above 1.

The present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an embodiment of an electronic delay electric detonator of the present invention, in which 20 is a sealing plug or plastic cap, 21 is a cylindrical casing, 22 is an embolus, 23 is an ignition charge cup, Reference numeral 24 is an inner tube, 25 is a detonator, 26 is an additive, 27 is a tube, and 28, 10 ', 11' are leg wires, which are connected to the input terminals 10 and 11 on the substrate 200.

The cylindrical casing 21 may be a right cylindrical tube, but in the illustrated example,
A tapered cylinder that converges from the sealing plug 20 side toward the detonator tube 27 side, and the sealing plug is provided at the end of the wide diameter side.
20 is arranged, and the storage condenser 7 is provided near the sealing plug 20.
To place. On the side with a narrow diameter, in the tube 27, from the bottom side thereof, the charge 26, the detonator 25 filled in the inner tube 24, and further through the gap, the ignition charge cup 23 is arranged, and the ignition charge cup 23 A resistance wire 16 for ignition is arranged therein, and finally, an opening of the tube body 27 is sealed with an embolus 22 to form a conventional electric detonator structure.
Lead to the ignition resistance wire 16 of the leg 28 from the substrate 200 to the embolus 22.

In the cylindrical casing 21, the capacitor 7 and the substrate 200 are arranged between the sealing plug 20 and the plug 22. As a result, the condenser-7 is placed in the wider inner diameter,
The substrate 200 is arranged with the inner diameter smaller than that.

In the above manufacturing, since explosives are applied, first, the electronic delay circuit board to which the storage capacitor-7 is connected is connected to the leg 28 of the plug 22 with the ignition device, and then,
The upper part of the tube body 27 of the electric detonator is caulked to the embolus 22 and fitted,
The assembly is housed in the tubular casing 21.

According to this, manufacturing is safe and easy, the electronic delay ignition device including the storage capacitor 7 and the electronic delay circuit board is compactly configured, and the space occupancy rate is effectively increased, so that the tubular casing 21 can be manufactured. Can be housed inside.

Further, as shown in FIG. 2, the embolus with an ignition device, the electronic delay circuit board and the storage capacitor may be integrally covered with a film. The coating avoids the risk of mechanically and electrically damaging the connections between the elements.

The electronic delayed ignition device used in the present invention is shown in FIGS.
As shown in the figure, it comprises a storage capacitor 7 and an electronic delay circuit board. The electronic delay circuit board comprises a diode bridge power supply input circuit 1, a bypass resistor 32, a specific number setting resistance element 8 and a time constant setting capacitor 9. Further, the monolithic IC 100 is formed by disposing it on a substrate made of, for example, glass epoxy or film carrier 200.

The monolithic IC 100 is composed of a comparison means, a latch means, and a switching means (not shown), and is designed so that current does not flow in at least one of the latch means and the switching means unless a comparison output thereof is generated, and power consumption is reduced. Use fewer circuits.

The monolithic IC 100 is molded with resin and embedded in the resin mold portion 101. Also, the monolithic IC can be configured by using a bipolar transistor or a MOS transistor.

Specifically, as the electronic delayed ignition device, those disclosed in the applicant's US Pat. No. 4,712,477 and US Pat. No. 4,586,437 can be used.

Here, the width of the substrate 200 is, as shown in FIG.
Do not make it larger than the outer diameter of the storage capacitor 7. In addition,
It is preferable to arrange the condenser 7 in the cylindrical casing 21 so that the inner diameter is the largest in order to maximize the capacity.

As shown in FIG. 3, the tubular casing 21 used in the present invention has a structure in which it is difficult to absorb the detonation energy of the electric detonator, so it is preferable that the tubular casing 21 is as fragile and thin as possible. In order to prevent dead pressure, it is better to have a cylinder structure that is thick to some extent. As described above, the tubular casing 21 is formed of a hard plastic that satisfies the two contradictory conditions and has the mechanical strength necessary to protect the electronic delay ignition device and the electric detonator while they are connected. Need to be When a hard plastic casing having a structure in which the thickness T of the side wall of the cylindrical casing 21 and the thickness t of the bottom wall satisfy t / T ≦ 1, the essential function of the electronic delay electric detonator is not impaired. Side thickness T is 0.5 mm
If it is above, it is difficult to insert it into explosives such as dynamite when creating the parent die, so 0.5-2 mm is appropriate. Further, in consideration of ease of insertion, it is desirable that the shape is pointed toward the bottom of the cylindrical casing. Therefore, as for the shape of the tubular casing, the inner diameter of the tube mouth is substantially determined by the diameter of the storage condenser 7, and the inner diameter is 7 to 9 mm, the outer diameter is 8 to 13 mm, the inner diameter near the tube bottom is 5 to 7 mm, and the outer diameter is A suitable length is 6 to 11 mm, and the length of the tubular casing 21 is 80 to 110 mm. The bottom of the tube is designed to be 50% to 90% of the thickness of the side surface. here,
The bottom wall is at least the tip of the tubular body, and in some cases, may be the tip of the tubular casing 21 including the storage position of the additive 26 in the detonator tube body 27.

In order to effectively transfer the detonating energy of the detonator to the explosive, it is preferable to use a relatively brittle and hard plastic material that absorbs little mechanical energy for the cylindrical casing.

The tubular casing used in the present invention has a bending strength of 20 to 2000 kg.
A plastic material having mechanical properties of / cm ² and an elastic modulus of 0.5 × 10 ^{4 to} 3 × 10 ⁴ Kg / mm ² is selected (ASTM method: according to D747, D638).

For impact, it is preferable to use a material having an Izod impact strength of at least 5 kg · cm / cm (6.4 mm width with a notch) according to ASTM D256 in order to protect the internal circuit including the monolithic IC.

Examples of the hard plastic material include polyethylene, polypropylene, polystyrene, polyester, polyvinyl chloride, ABS resin and the like. Among them, ABS resin can mold casings of various brittleness depending on the detonating force of the detonator due to its copolymerization component and has good adhesiveness, so that the detonator body, electric detonator of electronic circuit, electronic delay circuit It is a preferable material that can more reliably and inexpensively seal the substrate and the storage capacitor.

As a preferred ABS resin, a bending strength of 40 to 1000 Kg / cm ² ,
Elasticity 0.7-2.8 × 10 ⁴ Kg / cm ² , Izod impact strength 10-2
It is good if it has a physical property of about 0 (Kg · cm / cm · notched 6.4 mm width).

FIG. 4 is a sectional view of an embodiment in which the storage capacitor 7, the electronic delay circuit board and the plug 22 of the igniter connected in series are closely adhered to and surrounded by the film 500 in the longitudinal direction, and the whole is integrated. It is a figure. This coating can prevent the electronic elements (1, 8, 9, 32 and 101) on the electronic delay circuit board from being contaminated and absorb moisture, and can also fix the series array structure to make it mechanically rigid, so that the whole structure is cylindrical. There is an advantage that it can be easily inserted into the casing 21. As the usable film 500, an electrically insulating film (volume resistivity of about 10 ¹⁰ Ω · cm or more) such as vinyl chloride, vinylidene chloride, vinyl chloride copolymer, polyester, and fluorine resin can be used. As for the heat shrinkability of the film, it is preferable to use a material which exhibits shrinkage of 5 to 30% in length shrinkage and 40% to 80% in inner diameter shrinkage at a safe heating temperature for the ignition powder and electronic elements of the ignition device. Is. Commercial shrinkage starting temperature 50 ° C
A heat-shrinkable tube having a shrinkage completion temperature of about 75 ° C. to about 75 ° C. can be used. Thus, for the safety of the production of these electronic delay electric detonators, the connection of the ignition part and the original tube part filled with detonator is the final step, so as an intermediate product, the storage capacitor 7 and the electronic delay part are connected. A module is created that connects the ignition device and the plug 22 with the ignition device.

The protection and retention features of the electronic delay circuit board during the handling phase of this module ensure the final electronic delay electrical detonator.

FIG. 6 is an example of using the electronic delay electric detonator of the present invention, in which 30 ₁ , 30 ₂ ... 30 _n are electronic delayed ignition devices, and 12 and 13 are power supply terminals. , 14 is a comparison input terminal, 15
Is an ignition resistance terminal, and 16 is an ignition resistance wire.

(Example) Hereinafter, an example of the present invention will be described in detail.

Example 1 and Comparative Examples 1-2 An electronic delay electric detonator shown in FIG.
The parent die was created by inserting the product into [Asahi Kasei Co., Ltd., trade name Sunvex 100].

Next, two parent dies were placed in the sand at a distance of 15 cm, and the detonability was examined. The results are shown in Table-1.

Also, for comparison, no casing, casing thickness
The explosiveness was examined using a 0.3 mm one. Table of the results
Shown in 1. As the casing, an ABS resin composed of 45% styrene, 25% acrylonitrile, and 30% butadiene was used.

Examples 2 to 3 and Comparative Example 3 A heat-shrinkable tube having a diameter of 10 mm cut to a length of 40 mm [Sumitomo Chemical Co., Ltd., trade name: Sumitube C] was used.
As shown in (B), the storage capacitor, the electronic delay circuit board, and the plug with the ignition device are covered, and the tube is heated by a hot gun for 3 minutes (temperature 60 ° C.), and the tube is shrunk to make it as shown in FIG. 4 (C). After doing so, it was inserted into the cylindrical casing used in Example 1 to prepare an electronic delay electric detonator as shown in FIG.

The above 10 electronic delay electric detonators and 10 electronic delay electric detonators of Example 1 were placed in a small box and dropped from a height of 1 m onto the concrete surface 50 times, 100 times, and 200 times, and the damage state was observed.
The results are shown in Table-2.

In addition, for comparison, observation was also made for the case without the casing and the tube. The results are shown in Table-2.

(Effect of the Invention) The electronic delay electric detonator of the present invention is inexpensive, compact, strong against vibrations and impacts from adjacent holes, is not damaged, and does not apparently reduce the detonating force of the electric detonator. Also,
At the time of manufacture, the electronic delay circuit board, the electric energy storage capacitor, and the electric detonator can be connected safely and reliably.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the electronic delay electric detonator of the present invention, FIG. 2 is a sectional view of another embodiment of the electronic delay electric detonator of the present invention, and FIG. 3 is the present invention. FIG. 4 is a cross-sectional view of an embodiment of a tubular casing used, FIG. 4 is a cross-sectional view for explaining a film coating procedure in the electric delay electric detonator shown in FIG. 2, and FIG. 5 is an electronic device used in the present invention. FIG. 5 (A) is a front view showing an example of the structure of a differential ignition device.
FIG. 5 (B) is a rear view, FIG. 5 (C) is a sectional view taken along the line I-I 'in FIG. 5 (A), and FIG. 6 is a plurality of electronic delay circuit boards used in the present invention. It is the block diagram which connected. In the figure; 1 is a diode bridge power supply input circuit, 7 is an energy storage capacitor, 8 is a time constant setting resistance element, and 9 is
Is a capacitor for setting the time constant, 10 and 11 are input terminals, 1
0 ', 11' are leg wires, 12 and 13 are power supply terminals, 14 is a comparison input terminal, 15 is an ignition resistance terminal, 16 is an ignition resistance wire, 20 is a sealing plug, 21 is a cylindrical casing, and 22 is a plug. , 23 is an ignition charge cup, 24 is an inner tube, 25 is a detonator, 26 is an additive, 27 is a tube, 28
Is a leg wire, 29 is an electric detonator, 30 is an electronic delayed ignition device, 32 is a bypass resistor, 100 is a monolithic IC, 101 is resin, 200
Indicates a substrate, and 500 indicates a film.

Claims (2)

[Claims] 1. A sealing plug having a lead wire inserted through an opening end; a bottomed cylindrical body having a taper toward the bottom, and an electric ignition means together with a detonator at the bottom, which is sealed with an embolus. An electric detonator; an electronic delay ignition device in which an electronic delay circuit board electrically connected to the leg of the ignition means and an energy storage capacitor are sequentially arranged in series on the opening side; the detonator body and the electronic delay An ignition device and a tubular casing for sealing the sealing plug together with the sealing plug, wherein the tubular casing has an elastic modulus of 0.5 × 10 ^{4 to} 3.0 × 10 ⁴ kg / cm ² , a bending strength of 20 to 20.
Electron characterized by being made of a hard plastic having a mechanical property of 00 kg / cm ² , a thickness T of the side surface of 0.5 mm or more, and a thickness t of the bottom wall satisfying t / T ≦ 1 Delay electric detonator. 2. The electronic delay electric detonator according to claim 1, wherein the thickness t of the bottom wall of the cylindrical casing is 50% to 90% of the thickness T of the side surface.