JPH0416582A - Electronic time delay detonator - Google Patents

Abstract

PURPOSE:To prevent the generation of spilling of a diazonitrophenol initial explosive of the electronic time delay detonator and to completely eliminate the phenomenon that the initial explosive fails to make normal initial explosion by maintaining the apparent density of the initial explosive at a specific value. CONSTITUTION:The apparent density of the initial explosive 4 of the electronic time delay detonator by press packing the initial explosive 4 consisting of diazonitrophenol or a mixture composed of diazonitrophenol and potassium chlorate, etc., is specified to 1.00 to 1.16g/cc in an inside pipe 6. The jumping of the initial explosive 4 out of the inside pipe 6 when subjected to a fore-stage impact is prevented in this way. The spilling of the initial explosive 4 arises when the initial explosive is subjected to the impact if the apparent density of the initial explosive 4 is below 1.00g/cc and a so-called dead pressure is generated when the apparent density exceeds 1.16g/cc.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to an electronic time delay detonator for explosives used in rock crushing, ore mining, and building destruction.

<Conventional technology> The electronic time delay detonator will be explained based on FIG.

In the figure, 1 is an electronic time delay device, 2 is an ignition part, 3 is a space, 4 is a detonator, 5 is an additive, 6 is an inner tube, and 7 is a tube body, in which the inner tube, the initiator, and the additive are attached. An instantaneous detonator section is made up of the medicine and the detonator.

<Problems to be Solved by the Invention> Various performances are required of electronic time delay detonators, and one of the most important performances is impact resistance.

The electronic time delay detonator is subjected to the impact of the nearby preceding explosion during actual blasting. Therefore, various anti-shock measures have been proposed. One example of this is Japanese Utility Model Application No. 64-31398, which solves the problem by providing a shock absorbing part such as a space between the tube and the time delay electronic circuit. However, even when using an electronic time delay detonator having a shock-resistant electronic time delay device, the detonation may not occur properly depending on the conditions. As a result of our research into the cause of this, the present inventors have confirmed that in the instantaneous detonator section of the electronic detonator that receives the pre-stage impact, the detonator may jump out of the inner tube, and as a result, the detonation may not occur properly.

In the case of a conventional delay detonator with a delay charge, the above-mentioned situation did not occur because the delay charge was pressed onto the top of the detonator, but with an electronic delay detonator, the detonator part is filled with the detonator. The drawback is that it consists only of a charge, and if it receives an impact from the previous stage, the pressurized explosive charge may collapse and fly out of the inner tube.

(Means for Solving the Problems) The present inventors completed the present invention by confirming that the above drawbacks can be eliminated by appropriately maintaining the apparent density of the primer.

That is, the present invention provides an electronic time delay detonator containing a diazonitrophenol-based explosive, in which the apparent density of the explosive is 1.00.
The present invention relates to an electronic time delay detonator characterized in that the detonator is 1.1 Gg/cc.

Diazonitrophenol (hereinafter referred to as DDNP) or a mixture of DDNP and potassium chloride is usually used as the explosive. These primers are pressurized into the inner tube, and their apparent density is determined by measuring the weight and volume of the primers in the inner tube.

It was confirmed that by setting the apparent density to 1.00 to 1.16 g/cc, it was possible to prevent the explosive from jumping out of the inner tube when subjected to a pre-stage impact, and the present invention was completed.

If the apparent density of the priming charge does not reach 1.00, the priming charge will spill if it receives an impact, and if it exceeds 1.16, it will generate so-called original pressure.

<Effects of the invention> The phenomenon of the electronic time-delaying detonator not detonating normally has been completely eliminated.

(Example) The actual effectiveness of the present invention was measured using the following test method that simulates a pre-stage impact.

First, an electric detonator and dynamite 10 for impact generation were fixed at a depth of 1 m underwater, and then a detonator was placed at a predetermined distance at the same depth.
A sample electronic time delay detonator 11 consisting of a No. 6 detonator with DNPo, 2 g is fixed. The positional relationship in this test method is shown in Figure 2.

First, in the case of 30g of dynamite for impact generation, 50
In the case of g, the distance between the dynamite and the sample was set to 52 cm, and the underwater impact pressure that the sample received when the dynamite was exploded was measured.

The results are shown in Table 1.

Table 1 Examples 1 to 24 Next, the apparent specific gravity of the explosive of the electronic time delay detonator is 1.00 to 1.00.
Underwater shock pressure of 300k was applied to various samples changed to 1.16.
g/c+s", 359 kg/cm" once each, and 3
Added times.

Measure the amount of explosive spilled for each resulting sample,
We also investigated the moment when the detonator itself detonated and a complete detonation occurred. The results are shown in Table 2.

Comparative Examples 1 to 16 Next, all the treatments were carried out in the same manner as in the examples except that the apparent specific gravity of the initiator was changed to a value other than 1.00 to 1.16. The results are shown in Table 3.

Tables 2 and 3 show the following.

That is, in a sample where the apparent density of the priming agent is less than 1.00, the priming agent spills out and becomes half-exploded. In addition, in the sample with an apparent density exceeding 1.16, a half-explosion occurred, which is presumed to be due to the so-called source pressure, which is due to the specific gravity of DDNP being too high, even though there was almost no spillage of the explosive.

On the other hand, the effects of the present invention are obvious, and in the embodiments of the present invention, there was very little spillage of the explosive, and no half-explosion occurred.

[Brief explanation of drawings]

Figure 1 shows the configuration of an electronic time delay detonator. FIG. 2 is a drawing showing the positional relationship between the electric detonator for impact generation, dynamite, and the electronic time-delaying detonator used in the test in Examples and Comparative Examples. In the figure, 1 is an electronic time delay device, 2 is an ignition part, 4 is a detonator, 5 is an additive, 6 is an inner tube, 7 is a cylinder body, 10 is an electric detonator and dynamite for generating an impact, and 11 is a sample. shows.

Claims (1)

[Claims] In an electronic time delay detonator containing a diazonitrophenol-based detonator, the apparent density of the detonator is 1.00 to 1.16 g/
An electronic time delay detonator characterized by being a cc.