JP4285854B2 - Detonator - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an explosive explosive device used for initial driving of a high-speed flying object launcher such as a two-stage light gas gun.
[0002]
[Prior art]
Conventionally, explosives are used together with high-pressure gas for the initial drive of this type of high-speed flying object launcher. As the explosive detonator, an ignition ball that ignites the explosive with an electric ignition device is used, and an electric detonator is often used for the initial ignition of general blasting.
[0003]
[Problems to be solved by the invention]
The instantaneous electric detonator has a large variation in ignition delay time of 2 to 3 milliseconds from energization to ignition. Even with high-second precision electric detonators with small variations in the ignition delay time, the tolerance is ± 0.2 ms. An object of the present invention is to prevent gas leakage generated from an insertion port of an optical fiber through which a laser beam passes in an explosive detonator used for initial driving of a high-speed flying object launching device that uses a laser beam to detonate. is there.
[0004]
[Means for solving problems]
According to the first aspect of the present invention, there is provided a laser generating device and an optical fiber which is passed through a holder with a bare wire, the entire contact surface of the holder is fixed with an adhesive, and a laser beam generated by the laser generating device is introduced into an explosive chamber. It is characterized by the fact that smokeless gunpowder is charged in the gunpowder chamber, a charge transfer agent is disposed on the front side of the gunpowder chamber, and an igniter in contact with the front end of the optical fiber is disposed in front of it.
[000 5 ]
According to the present invention, it is possible to suppress the ignition delay time from laser irradiation to ignition to several milliseconds and the tolerance of variation in the ignition delay time to several tens of microseconds. In addition , according to the experiments by the present inventors, when an optical fiber coated with resin was used, and the explosion was started in a state where one portion of the optical fiber insertion port was fixed with an adhesive through a holder, depending on the amount of explosive, the optical fiber insertion port However, in the case of the present invention, no gas leak occurred .
[000 6 ]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a small two-stage light gas gun as a high-speed projectile launching apparatus. An explosive chamber 1 and an acceleration tube 2 are separated by a stainless steel diaphragm 3 having a thickness of 0.5 mm. The static breaking pressure of the diaphragm 3 is 20 MPa ± 15%. The front side of the explosive chamber 1 is charged with 3 to 10 g of smokeless gunpowder 4 manufactured by Nippon Oil & Fats Co., Ltd. 10 mg of silver azide pellet 6 manufactured by Chuka Kayaku Co., Ltd. is provided.
[000 7 ]
The silver azide pellet 6 is peeled off from the coating resin and passed through a metal sleeve 8 attached to the holder 7, and the sleeve 8 and the entire contact surface are fixed with a two-component adhesive made by Grace Japan Co., Ltd. The glass fiber 9 is in contact with the tip of a glass fiber 9 (core diameter 0.6 mm) manufactured by Fujikura Corporation as an optical fiber, and is connected to a handy type lightweight YAG laser generator (not shown) that generates a trigger signal. An output signal at the time of laser irradiation is detected by a digital strange scope (not shown).
[000 8 ]
The explosive chamber 1 is also provided with a pressure transducer 10 so that the time change of pressure at the time of detonation can be measured.
[00 09 ]
【Example】
5 g of smokeless explosive 4 was used and detonated using YAG laser light (pulse width 7 ns, energy 25 mj). And the output signal at the time of laser irradiation was detected with the digital strange scope, and the pressure in the gunpowder chamber was measured with the pressure transducer 11. This experiment was repeated three times under the same conditions. The maximum pressure at this time was 71.9 ± 1.1 MPa. Also, the time from laser irradiation to ignition (ignition delay time) t ₁ , the time t ₂ until reaching the maximum pressure, and the time t ₃ until the ignition ends are 2835 ± 47 μsec, 3758 ± 31 μsec, It was 4648 ± 121 μsec.
[00 10 ]
FIG. 2 shows an output signal at the time of laser irradiation and a pressure history in the explosive chamber. As shown in the figure, according to this initiation method, the reproducibility of the pressure history is good, the tolerance of variation in the ignition delay time is small, and the ignition performance is highly accurate. In the above experiment, gas leakage from the optical fiber insertion port was not visually observed three times.
[001 1 ]
Incidentally, when the glass fiber was covered with resin and passed through the sleeve 8 and the optical fiber insertion port was fixed using the same adhesive as described above, gas leakage occurred when the amount of the smokeless gunpowder 4 exceeded 5 g.
[001 2 ]
【The invention's effect】
According to the explosive device for explosives for initial drive of the high-speed flying object launching device according to the first aspect of the invention, a highly accurate trigger signal can be obtained by laser initiation, the variation in ignition delay time is small, optical visualization of the phenomenon, pressure Measurement, speed measurement, etc. can be performed efficiently and easily, and the reproducibility of pressure history is also good. Further leakage gas from the igniter rear of the feeder and was detonated can be prevented in a simple manner, it is possible to effectively use the explosive energy, also smaller with roses ignition delay time, reproduction of the pressure history Also improves.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a main part of a small two-stage gas gun.
FIG. 2 is a diagram showing an output signal at the time of laser irradiation and a pressure history in the explosive chamber.
[Explanation of symbols]
1 .... explosive chamber 2 .... acceleration tube 3 .... diaphragm 4 .... smokeless powder 5 .... black powder 6 .... silver azide pellet 7 .... holder 8 ... sleeve 9 ... glass fiber 10 ... pressure transducer

Claims (1)

An explosive explosive device used for the initial drive of a high-speed flying object launcher. The laser generator is passed through the holder with a bare wire, and the entire contact surface of the holder is fixed with an adhesive. the laser beam generated Ri Do from an optical fiber for introducing the explosive chamber, with the explosive chamber smokeless powder is charge, the transfer charge in front of the explosive chamber, ignition charge further contact with the tip of the optical fiber in front Gunpowder detonator characterized by being arranged .

Images