JPS61117188A - Electric primer and initiation - 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 an industrial electric detonator for detonating explosives used in civil engineering, crushed stone, limestone, metal, coal mines, etc. Improved performance and safety during the manufacture of electric detonators can be obtained.

(Prior art) As shown in Fig. 2, a conventional electric detonator includes a charge 2 and a detonator 3 in a metal tube 1, an inner tube 4 surrounding the detonator 3, and an inner tube 4 with a charge 2 and a detonator 3 placed in the upper part of the inner tube. A time delay charge 5 is installed as necessary, a powdered ignition charge 6 is provided on top of the charge, and an electric bridge wire 7 is buried in the ignition charge, and the ignition charge 6 is immersed in the electric bridge wire 7 by heating. This is a method in which the charge is ignited, the time delay charge 5 is ignited, the initiating charge 3 is ignited, and the charge is detonated.

(Problems to be Solved by the Invention) Conventional electric detonators are so sensitive to electricity that approximately 50% of them catch fire when a current of 0.35 A is applied to the bridge wire. This performance is necessary to ensure the prevention of misfires at the site of use, but on the other hand, leakage current
There are concerns about explosions caused by induced currents caused by lightning and radio waves, or by static electricity, so there are various work restrictions when using them.

Furthermore, since conventional electric detonators contain ignition powder, which is the most sensitive of all explosives, there are safety problems in use and manufacture. When in use, an electric detonator is inserted into an explosive such as dynamite to serve as a primary charge, and the blast hole is loaded with a charging rod and filled with a charge made of sand and clay.

At this time, the roughness of the inner wall of the blast hole, the presence of rock particles, etc. may make it difficult to load the parent die and fill the charge, and in some cases, a strong impact may be applied to the electric detonator in the parent die, causing it to form. Sometimes.

In such a case, since the ignition charge part of the electric detonator is generally the weakest in terms of mechanical strength, there is a risk that the detonator will be intensively deformed, the ignition charge will ignite, and the electric detonator will explode.

Furthermore, during manufacturing, there is a constant risk of accidental ignition during the process of weighing and filling sensitive ignition powder.

(Means for Solving Problem A2) The present invention employs a structure in which the electric detonator can be ignited without using the most sensitive igniter among the explosives constituting the electric detonator, thereby replacing the conventional electric detonator. An explosive that solves the problem and has the same level of insensitivity as additives such as trinitrotoluene (TNT), pen slit (PETN), hexogen (RDX), and cyclotetramethylenetetranitramine (HMX), which can replace the igniter. By using a fuse consisting of a tube whose inner wall is coated with a thin layer of
It improves safety in use and manufacturing, and at the same time, it performs as an electric detonator by completely detonating explosives that have the same level of insensitivity as the charge by line detonating the bridge wire. was maintained.

In other words, 1 the present invention provides: (1) ignition between the bridge wire and the raw detonator (loaded with additives and detonators and inserted with a delay charge if necessary) by causing the bridge wire to explode with a large current; A method for detonating an electric detonator, which is characterized by igniting a thin layer explosive of an electric detonator using a fuse made of a tube whose inner wall is coated with a thin layer of explosive as a part, and thereby detonating the detonator.

(2) An electric detonator characterized in that a fuse tube made of a tube whose inner wall is coated with a thin layer of explosive is used as the ignition part between the bridge wire and the raw material detonator.

It is.

The fuse tube made of cheap whose inner wall is coated with a thin layer of explosives used in the present invention is disclosed in Japanese Patent Publication No. 49-12699, for example.
As stated in the issue.

Thin-layer explosives include benzurite (PBTN), hexogen (RDX), cyclotetramethylenetetranitramine (Hf'14X), and dinitroethyl urea.

, trinitrotoluene (TNT), etc., and a flexible resin is used for the cheap material, but metal may also be used. Also, as shown in Japanese Patent Application Laid-open No. 55-37487, a thin layer explosive is prepared by mixing HMX and aluminum at a ratio of 91:9, and the tube is Surlyn 1354 manufactured by DuPont, outer diameter 3. Gate, inner diameter 1.5f
2 can be used that uses Chive l. The length of the fuse contained in the electric detonator is preferably 5 to 30 # from the viewpoint of the maximum detonation distance of the thin layer explosive and the ease of manufacturing the electric detonator.

The electric bridge wire used in the present invention is made of metals such as gold, silver, platinum, iridium, nickel, chromium, and tungsten, and alloys thereof. Preferably, platinum and iridium are used in terms of strength and resistivity. This is an alloy commonly used in electric detonators with a ratio of 80:20. The length of the electric bridge line is 0.
3 to 10 M is preferable, and 1.5 to 2.0 M is more preferable. If the wire diameter of the electric bridge wire is smaller than 5 μm, it is extremely difficult to connect the electric bridge wire to the lead wire 8, and 3
If it exceeds 00μ, the resistance of the bridge wire becomes small and it is difficult to cause a wire explosion. Therefore, in the case of the above-mentioned platinum and iridium alloys, it is preferably in the range of 15 to 300μ due to the relationship with resistivity. 35μ is most preferred.

When igniting the thin layer explosive in the fuse in the wire explosion of the bridge wire of the present invention, the magnitude of the current flowing through the bridge wire is an important factor.

The meaning of large current in the present invention is an extremely large current of several hundred amperes or more, since the ignition of a general electric detonator is controlled by a current of several amperes.

The material of the electric bridge wire has a platinum:iridium ratio of 80:20.
When the wire diameter is 32μ and the length is 1.5M, the thin layer explosive in the fuse tube is ignited with a current of 250 amperes or more, preferably 500 amperes or more, so the wire explosion of the bridge wire of the present invention is as follows:
In the case of one electric detonator according to the present invention, it has an output voltage of 500V or more in a normal blaster used for igniting a conventional electric detonator, and a capacitor capacity of 30aF or more, or 5ooov or more and 10μF or more. A blaster can be used.

On the other hand, at voltages exceeding IV and below 100V, the electric bridge wire causes a relatively large wire explosion, but the energy of the wire explosion is insufficient and the thin layer explosive is not ignited.

Therefore, the present invention has the excellent feature that it does not explode due to leakage current, static electricity, radio waves, high voltage lines, induced currents such as lightning, etc.

Next, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the electric detonator of the present invention,
Additive 2. A detonator 3 is loaded, and a thin layer of explosive 11 is coated on the inner wall as an ignition part between the raw material detonator and the electric bridge wire 7 at the tip of the embolus 9, which is loaded with an inner tube 4 and a delay charge 5 if necessary. A fuse tube A consisting of a tube 12 is used, and the fuse tube is held by a cylindrical tube 13. In order to detonate this electric detonator, a large current is passed through the leg wire 10, the bridge wire 7 is detonated, and shock pressure is generated. Detonate II. At this time, the amount of explosive 11 coated in the fuse tube A is extremely small at 20ff+9 per meter, so even if it is detonated and the high-temperature, high-velocity gas shock wave propagates inside the fuse tube, the tube 12 and the tube 13 It cannot be destroyed at all.

In this way, the shock wave reaches the surface of the time-prolonging drug 5 at a speed of about 2000 m/s, and the shock wave reaches the drug surface of the time-prolonging drug 5. ignite it.

(Function) The present invention combines a bridge wire that causes a line explosion with a large current and a fuse tube made of a tube whose inner surface is coated with a thin layer of explosives that are safer than igniters and primers.
Improving safety against electrical elements such as leakage current at the blasting site, static electricity of 1M, induced current from high-voltage lines and radio waves, etc. 2. Improving safety against electrical elements such as leakage current at the blasting site, static electricity, and induced current from high-voltage lines and radio waves. It is possible to provide an electric detonator with improved safety against mechanical elements such as impact friction and other forces.

The reason why the impact resistance of electric detonators is improved will be explained.

The loading charge is extremely insensitive to both the priming charge and the ignition charge. On the other hand, the detonator and the igniter have the same degree of sensitivity, but the detonator is protected by a metal inner tube as shown in Figures 1 and 2, so no external force is applied to the electric detonator. It is relatively safe because there is little deformation and therefore there is almost no frictional impact during deformation.

However, the ignition powder part is contained in a container consisting only of a tube body, and when an impact greater than the deformation resistance of the tube body acts in a direction perpendicular to the axis of the electric detonator, the ignition powder part is greatly squeezed inward and this The ignition powder may ignite due to the impact friction caused by the explosion. In addition to this, especially when an impact load is applied in the axial direction of the electric detonator! In order to investigate the deformation of the detonator, 2.36 kl was dropped onto an electric detonator placed vertically on the ground. As a result, at the same time that the heavy bell comes into contact with the embolus, the base frame bites into the pipe body, and as a result, the ignition charge is transferred between the embolus and the delay charge in the case of a staged electric detonator. in,
It has been found that instantaneous electric detonators are rapidly compressed between the base frame and the inner tube and ignite.

However, according to the present invention, the antidote adhered in a thin layer to the inner surface of the tube is safer than ignition powder because it contains relatively insensitive ingredients like the additives such as TNT, tetryl, hexogen, and HMX. It is.

At the same time, these thin layers are protected by a tube and preferably a barrel, so that they are subjected to less impact, making them safer than conventional igniters.

(Example of actual power) Practical examples of the present invention will be shown below.

Practical example 1゜A raw material detonator with a time-delaying part installed has a length of 21M and an outer diameter of 6aII11. A polyethylene cylindrical tube with an inner diameter of 3 mm and a chain with an outer diameter of 3 coated with an explosive consisting of 91 parts of 1MX and 9 parts of aluminum powder on the inner wall of the cheap at a rate of 20 mg per meter.
Chu, DuPont Chilin 1 with inner diameter 1.51 + ET11
354 resin tube and NONFiLM pipe starter fuse made by Nitro Nopel with a length of 1011 mm.
! The electric bridge wire, which has the structure shown in Fig. 1 and has a fuse tube cut into I11, is installed on the time delay 5. The material is an alloy with a platinum:iridium ratio of 80:20, the wire diameter is 32μ, and the length is 32μ. 1.51
A +ll11 electric bridge wire was used and fixed to the embolization tube body at a position 1 distance from the upper end of the fuse tube, and the total length of the tube body at this time was 56 mm. As a power source, a 10μF capacitor charged to 700V is connected to the original vinyl cord 1.
．． 25ffllll+ blasting bus line 5 m (10 m round trip)
One electric bridge wire was loaded through an 80Crn leg wire using the following.

As a result, as shown in Table 1, all the detonators exploded after 30 tests, and even in the JISK lead plate test, the through hole diameter was 1.
0.41+! There were no problems with the power of the I11.

Next, in order to examine the mechanical shock resistance of the electric detonator of the present invention, the Kt electric detonator was placed vertically on an iron anvil.
A 6 ky weight is dropped from a height of 200 Crn,
I saw if it would explode on impact with a falling hammer. As a result, no fire occurred during the 10 tests.

Practical Example 2゜Other conditions are the same as in Example 1, but the length of the tube is 26
11111, length of fuse tube is 15m, length of pipe body is 61a
30μF charged to 500V as a power supply.
A capacitor was used.

As a result, as shown in Table 1, all detonators exploded after 30 tests, and there were no problems in the JIS lead plate test and drop hammer impact test.

Example 3 Other conditions are the same as Example 1, but the length of the tube is 31M.
, the length of the fuse tube was set to 20, the length of the pipe body was set to Y66fl, and the power source was 1 normal blaster T-200 manufactured by Nikka Seiki ■.
(Charging voltage 1200V, capacitor capacity 10μF), original vinyl cord 1.25Wr as blasting bus.
Using rR2 30fi (60m round trip), 80Crn
The load was applied to one electric bridge wire through the leg wire of the bridge. As a result, as shown in Table 1K, all detonators exploded after 30 tests.
There were no problems in the JIS lead plate test and drop hammer impact test.

Example 4 A 200 V commercial power supply was applied to the electric detonator shown in Example 1 through an 80 crn leg line and an original vinyl/I/ code t, zsx'3om (60 m round trip). The results are in Table-1
The electric detonator shown in Figure 3 did not ignite in all 30 tests.

Comparative Example 1゜A 100V commercial power source was applied through the leg line of the conventional drowsiness detonator YSOCM shown in Fig. 2 and the prototype beer cord 1, 230m (60m round trip). The results are in Table-2
As shown in Figure 3, all of the cases exploded after 30 tests. In addition, in the drop hammer impact test, 4 out of 10 explosions occurred.

(Effect of the invention) (1) Superior impact resistance compared to conventional products.

(2) Superior to conventional products in terms of leakage current, static electricity, R conduction current, etc.

(3) It is safe to manufacture because no sensitive ignition powder is used.

(4) Because of the above performance, it is extremely safe to handle at the site of use.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electric detonator showing an example of the present invention, and FIG. 2 is a sectional view of a conventional electric detonator. 1... Pipe body 2... Loading agent 3... Explosive charge 4... Inner tube 5... Time delay charge 6... Ignition charge 7... Electric bridge a 8... Lead wire 9...
Embolus 10...Leg line 11...Thin layer explosive 12
...Tube 13...Cylinder Pipe

Claims (3)

[Claims] (1) A thin electric detonator using a fuse tube consisting of a tube whose inner wall is coated with a thin layer of explosives as the ignition part between the bridge wire and the raw material detonator by detonating the bridge wire with a large current. A method for detonating an electric detonator, characterized by igniting a layered explosive and thereby detonating the detonator. (2) An electric detonator characterized in that a fuse tube made of a tube whose inner wall is coated with a thin layer of explosive is used as the ignition part between the bridge wire and the raw material detonator. (3) The electric detonator according to claim 2, in which the electric bridge wire and the fuse are surrounded by a cylindrical tube.