JPH02115698A - Electronic delay electric detonator - Google Patents

Abstract

PURPOSE:To obtain an electronic delay electric detonator having a structure for performing safely and effectively by sealing in a hard plastic cylindrical casing of specific structure. CONSTITUTION:A cylinder is tapered convergent from a sealing plug 20 side toward a detonator tube 27, the plug 20 is disposed at the end of a wide diameter side, and a storage capacitor 7 is disposed near the plug 20. Powder 26, detonating powder 25 filled in an inner tube 24, and igniting powder cup 23 are disposed from the bottom side in the tube 27 at the narrow diameter side, an igniting resistance wire 16 is disposed in the cup 23, and the opening of the tube 27 is sealed with a block plug 22 in a structure of an electric detonator. A leg line 28 is led from a board 200 to the wire 16 in the plug 22. The capacitor 7 and the board 200 are disposed between the plug 20 and the plug 22 in a cylindrical casing 21. The casing 21 is formed of hard plastic having mechanical properties of 0.5X10<4>-3.0X10<4>kg/cm<2> of elastic modulus, 20-200kg/cm<2> of bending strength.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric detonator with an electronic delay ignition device, and more particularly, to an electric detonator having an electronic delay ignition device and an energy storage capacitor. This invention relates to a compact electronic delay electric detonator which is integrally connected with the detonator and is entirely enclosed in a cylindrical casing.

(Prior Art) Electronic delay electric detonators are described in US Pat. No. 4,145,970, US Pat. No. 4,240,350, US Pat. No. 4,311,096, US Pat. No. 4,445,435 and US Pat. U.S. Patent No. 4,586,437 and U.S. Patent No. 471,247
It is disclosed in Specification No. 7, etc. This electronic delay electric detonator combines an electric detonator containing an electric bridge type ignition means with an electronic delay ignition device consisting of an electric energy storage capacitor (hereinafter referred to as storage capacitor) and an electronic delay circuit board. be. If the electronic delayed ignition device can be enclosed as a single unit device within the electric detonator tube, the electronic delayed ignition device can be significantly miniaturized.

Such attempts include the aforementioned US Pat. No. 4,145,970;
U.S. Patent No. 4311096, U.S. Patent No. 458643
It is stated in the Specification No. 7, etc. However, if the entire electronic delayed ignition system is housed within the electric detonator tube, it is currently difficult to achieve commercial success due to significant limitations due to the capacity of the storage capacitor. To be more specific, the capacitance of the storage capacitor is 100 to 1.000 pF, and the withstand voltage is I.
If it exceeds OV, the outer diameter of the storage capacitor becomes large, and if the volume is reduced while maintaining the desired electrical performance of the capacitor, the internal resistance increases and the temperature sensitivity decreases significantly. The spatial volume of the storage capacitor is thus large, and it is currently technically and economically difficult to encapsulate it safely and without damage in an electric detonator tube together with any electronic delay circuit board.

Therefore, as described in U.S. Pat. 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 hinders the detonating force of the electric detonator. Must not be. The cylindrical casing is to prevent damage to the electronic retarded ignition system.

On the other hand, it is also necessary for manufacturing to assemble the electronic delayed ignition device and the electric detonator and to enclose them in a cylindrical casing without damaging them. For example, the electrical connections between electric detonators, electronic delay circuit boards, and storage capacitors suffer from disconnection due to transport vibrations and shocks. i.e. electric detonator, electronic delay circuit board,
It is desired that the storage capacitor combination itself has the function of protecting and retaining the electronic circuit board.

(Means for Solving the Problems) The present inventors have proposed a method that does not have the above problems, is inexpensive, compact, and has a mechanical and electrical connection between an electronic delay circuit board, a storage capacitor, and an electric detonator. With the aim of obtaining a casing-enclosed electronic delay electric detonator having a structure that can be achieved safely and reliably, we have conducted various studies and found that an electric detonator, a separate electronic delay circuit, a storage capacitor, By arranging these members in series along the longitudinal direction of the electric detonator tube body and sealing the entire body in a hard plastic cylindrical casing of a specific structure to constitute an electronic delay electric detonator, damage can be prevented. The inventors have discovered that it is possible to provide an electronic delay electric detonator that does not reduce the detonation force of the electric detonator in appearance and has a structure that can be achieved mechanically and electrically safely and reliably, and has completed the present invention. .

That is, the present invention provides a sealing plug in which a conductive wire is inserted through the open end;
An electric detonator in which an electric ignition means is sealed together with a detonator at the bottom in a bottomed cylinder tapered toward the bottom; an electric detonator is connected to the leg wire of the ignition means on the opening side. an electronic delay ignition device in which a connected electronic delay circuit board and an energy storage capacitor are arranged in series; and a cylindrical casing that encloses the detonator tube body and the electronic delay ignition device together with the sealing plug. , the cylindrical casing has an elastic modulus of 0.5 x 104 to 3.0 x 104 Kg/cm
2. Bending strength 20-2. This is an electronic delay detonator characterized by being made of hard plastic having mechanical properties of OOOKg/cm''.

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

FIG. 1 is a sectional view of one embodiment of the 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
24 is an ignition powder cup, 24 is an inner tube, 25 is a detonator, 26 is an additive, 27 is a tube body, 28.10'11' is a leg wire, which is connected to the input terminals 10 and 11 on the board 200. ing.

The cylindrical casing 21 may be a right cylindrical tube, but in the illustrated example,! It is a cylinder with a taper converging from the sealing plug 20 side toward the detonator tube body 27 side, and the sealing plug 20 is arranged at the end on the wide diameter side, and the storage capacitor is placed near the sealing plug 20. Place 7. On the narrower diameter side, the tube body 2
7, from the bottom side, the additive 26, the explosive 25 filled in the inner tube 24, and further through the gap, the ignition powder cup 23.
, the ignition resistance wire 16 is placed inside the igniter cup 23 , and finally, the opening of the tube body 27 is sealed with an embolus 22 .
It will have the structure of a conventional electric detonator.

The leg wire 28 from the board 200 is connected to the embolus 22 by the ignition resistance wire 1.
Lead to 6.

Inside the cylindrical casing 21, a sealing plug 20 and an embolus 2 are installed.
2, a capacitor 7 and a substrate 200 are arranged. As a result, the capacitor 7 is placed on the side with a wider inner diameter, and the substrate 200 is placed on the side with a smaller inner diameter.

In the above manufacturing process, explosives are used, so first, the electronic delay circuit board to which the storage capacitor 7 is connected is
It is combined with the leg line 28 of the embolus 22 with an igniter, and then,
The upper part of the tube body 27 of the electric detonator is caulked and fitted to the embolus 22, and the assembly is housed in the cylindrical casing 21.

According to this, manufacturing is safe and easy, and the electronic delay ignition device including the storage capacitor 7 and the electronic delay circuit board is configured compactly, and the space occupancy rate is effectively increased. can be accommodated.

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

The electronic delayed ignition device used in the present invention is shown in FIGS. 5 and 6.
As shown in the figure, the electronic delay circuit board is composed of a storage capacitor 7 and an electronic delay circuit board, and the electronic delay circuit board includes a diode bridge power input circuit 1, a bypass resistor 32, a time constant setting resistor element 8, and a time constant setting capacitor 9. Furthermore, the monolithic IC 100 is arranged on a substrate made of glass epoxy or a film carrier 200, for example.

The monolithic IC 100 is composed of comparison means, latch means, and switching means (not shown), and is designed so that no current flows through at least one of the latch means and the switching means unless the comparison output is generated, thereby reducing power consumption. Use fewer circuits.

Monolithic IC100 is molded with resin,
It is embedded in the resin mold part 101. Further, the monolithic IC may be a bipolar transistor or an M
It can also be configured using OS transistors.

Specifically, electronic delayed ignition systems are described in Applicant's U.S. Pat. No. 4,712.477, U.S. Pat.
86, 437 can be used.

Here, the width of the substrate 200 is not larger than the outer diameter of the storage capacitor 7, as shown in FIG. 5(C). In order to maximize the capacity, it is preferable to arrange the condenser 7 in the portion of the cylindrical casing 21 with the largest inner diameter.

As shown in FIG. 3, the cylindrical casing 21 used in the present invention has a structure that is difficult to absorb the detonation energy of the electric detonator, so it is preferable to have a cylindrical structure that is as fragile and thin as possible. In order to prevent source pressure, it is better to have a somewhat thick cylindrical structure.

In this way, the cylindrical casing 21 is made of hard plastic that satisfies the two conflicting conditions and has the mechanical strength necessary to protect the electronic delayed ignition device and the electric detonator while they are still connected. There needs to be. If a hard plastic casing having a structure in which the side wall thickness T and the bottom wall thickness t of the cylindrical casing 21 satisfy t/T≦1 is used, the essential function of the electronic delay electric detonator is not impaired. The thickness T of the side surface should be 0.5 mm or more, but 0.5 to 2 mm is appropriate because it becomes difficult to insert into explosives such as dynamite when creating the parent die.

In addition, considering ease of insertion, it is desirable that the cylindrical casing has a pointed shape toward the bottom.

Therefore, the shape of the cylindrical casing is such that the inner diameter of the pipe opening is substantially determined by the diameter of the storage capacitor 7, and is 7 to 91 mm, the outer diameter is 8 to 13 mm, the inner diameter near the bottom of the tube is 5 to 7 mm, and the outer diameter is 7 to 91 mm. 6 to 11 mm, length of cylindrical casing 21 80 to 11
0 mm is appropriate. In addition, the bottom of the tube is 50 mm thicker than the side surface.
% to 90%. Here, the bottom wall is at least the tip of the cylinder, and in some cases, the detonator tube body 2
It may be the tip of the cylindrical casing 21 that includes the storage position of the additive 26 in the casing 7 .

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

The cylindrical casing used in the present invention has a bending strength of 20 to 20
00Kg/c1112, elastic modulus 0.5X 10' ~3
A plastic material with mechanical properties of XIO'g/mm'' is selected (according to ASTM method: D747, D638).

With respect to impact, it is preferable to use a material having an Izot impact strength of at least 5 Kg-cm/cm (6.4 mm width with notch) according to ASTM D256 in order to protect the internal circuitry including the monolithic IC.

Examples of hard plastic materials include polyethylene, polypropylene, polystyrene, polyester, polyvinyl chloride, ABS resin, and the like. Among them, AB
Due to its copolymerized components, S resin can be molded into casings of various fragility depending on the detonating force of the detonator, and has good adhesive properties, so it can be used for detonator bodies, electric detonators for electronic circuits, electronic delay circuit boards, It is a preferred material that can seal the storage capacitor more reliably and at a lower cost.

A preferable ABS resin has a bending strength of 40 to 1000.
Kg/cm2, elastic modulus 0.7-2.8X 10'K
g/cm2, Izot impact strength 10-20 (Kg・
cm/cm ・width of 6.4 mm with notch) is good.

FIG. 4 shows the storage capacitor 7, electronic delay circuit board and igniter embolus 22 connected in series to a film 500.
FIG. 2 is a cross-sectional view of an embodiment in which the entire body is integrally covered with a periphery in close contact with the periphery in the longitudinal direction. This coating covers the electronic components (l, 8.9.32 and 10) on the electronic delay circuit board.
In addition to preventing dirt and moisture absorption (1), the serial arrangement structure can be fixed and made mechanically rigid, which has the advantage that the whole can be easily inserted into the cylindrical casing 21. As the film 500 that can be used, vinyl chloride,
Vinylidene chloride, vinyl chloride copolymer, polyester,
Electrical insulation properties such as fluorocarbon resin (volume resistivity approximately 10I0Ω・
cm or more) can be used. The heat shrinkability of the film is 5 to 30% in length shrinkage and 4 in inner diameter shrinkage at a heating temperature that is safe for the ignition device's ignition charge and electronic elements.
It is preferred to use materials that exhibit a shrinkage of between 0% and 80%. A commercially available heat-shrinkable tube having a shrinkage start temperature of 50°C to 75°C and a shrinkage completion temperature of about 120°C can be used. For safety reasons during production, these electronic delay electric detonators are manufactured in such a way that the ignition part and the master tube part filled with the detonator etc. are connected in the last process. Embolus with igniter and igniter 22
A module is created by connecting the .

The protection and retention function of the electronic delay circuit board during the handling stage of the module ensures the final electronic delay electric detonator.

FIG. 6 shows an example of using the electronic delay electric detonator of the present invention, in which 30. ．． 30□...301 indicates an electronic delayed ignition device, 12.13 indicates a power supply terminal, 14 indicates a comparison input terminal, 15 indicates an ignition resistance terminal, and 16 indicates an ignition resistance wire.

(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 and Comparative Examples 1 to 2 The electronic delay detonator shown in FIG.
0g (manufactured by Asahi Kasei Kogyo Co., Ltd., trade name Sanbenx 10)
0] to create a parent die.

Next, two parent dies were placed 15 cm apart in the sand,
Tested for explosiveness. The results are shown in Table-1.

In addition, for comparison, the detonation properties were tested using samples without a casing and with casing thicknesses of 0 and 3 mm.

The results are shown in Table-1. The casing is made of 45% styrene, 25% acrylonitrile, 3 butadiene.
An ABS resin consisting of 0% was used.

Table-1 Examples 2 to 3 and Comparative Example 3 Heat-shrinkable tube with a diameter of 10 mm cut to length 401III+ [manufactured by Sumitomo Chemical Co., Ltd., product name: Sumitube C]
], as shown in Figure 4(B), a storage capacitor,
Cover the electronic delay circuit board, embolus with igniter, and heat the tube with a hot gun for 3 minutes (temperature 60'C) L
, after shrinking the tube as shown in Figure 4(C),
An electronic delay electric detonator as shown in FIG. 2 was prepared by inserting it into the cylindrical casing used in Example 1.

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

In addition, for comparison, observations were also made on a sample without a casing or tube. The results are shown in Table-2.

Table (Effects of the Invention) The electronic delay electric detonator of the present invention is resistant to vibration and impact from adjacent holes, and is inexpensive and compact. Further, during manufacturing, the electronic delay circuit board, the electric energy storage capacitor, and the electric detonator can be connected safely and reliably.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the electronic delay electric detonator of the present invention, FIG. 2 is a cross-sectional view of another embodiment of the electronic delay electric detonator of the present invention, and FIG. 3 is a cross-sectional view of another embodiment of the electronic delay electric detonator of the present invention. FIG. 4 is a cross-sectional view for explaining the method of covering the film in the electronic delay electric detonator shown in FIG. 2, and FIG. An example of the structure of a delayed ignition device is shown, with Fig. 5(A) being a front view, Fig. 5(B) being a back view, and Fig. 5(C) being a cut along line >I' in Fig. 5(A). The sectional view and FIG. 6 are block diagrams in which a plurality of electronic delay circuit boards used in the present invention are connected. In the figure; l is a diode bridge power input circuit, 7 is an energy storage capacitor, 8 is a resistor element for setting the time constant,
9 is a time constant setting capacitor 10, ]1 is an input terminal,
10' and 11' are leg wires, 12.13 is a power supply terminal, 14 is a comparison input terminal, 15 is an ignition resistance terminal, 16 is an ignition resistance wire, 2° is a sealing plug, 21 is a cylindrical casing, and 22 is a Embolus, 23 is an igniter cup, 24 is an inner tube, 25 is a detonator,
26 is an additive, 27 is a tube body, 28 is a leg line, 29 is an electric detonator, 30 is an electronic delay ignition device, 32 is a bypass resistor,
100 is a monolithic IC, 101 is a resin, 200 is a substrate, and 500 is a film. Patent applicant: Asahi Kasei Industries, Ltd. Figure 4 (A) (B) (C)

Claims (1)

[Claims] A sealing stopper with a conductor inserted through the open end; an electric detonator in which an electric ignition means is sealed with an embolus in a bottomed cylinder tapered toward the bottom, along with a detonator; an electronic delay ignition device comprising an electronic delay circuit board and an energy storage capacitor electrically connected to the legs of the ignition means arranged in series; and a cylindrical casing enclosed together with a sealing plug, the cylindrical casing having an elastic modulus of 0.
An electronic delay electric detonator characterized by being made of hard plastic having mechanical properties of 5 x 10^4 to 3.0 x 10^4 Kg/cm^2 and bending strength of 20 to 2,000 Kg/cm^2.