JPS584907Y2 - Detonator protection tube - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a protective tube for a detonator.

Hydrous explosives, which have come into use in recent years, have their safety and
The superiority of the gas after blasting has been highly praised, but it has been said that it is more susceptible to source pressure than the conventionally used dynamite.

In most cases of blasting, blasting is carried out using staged electric detonators, which have a time lag between energization and detonation.

Here, the source pressure refers to the phenomenon in which, when blasting is carried out using staged electric detonators, the detonation pressure from the explosion of the first stage prevents the explosive from detonating even though the electric detonator for the latter stage explodes. good,
This occurred more often when hydrous explosives were used than when dynamite was used.

The inventor of the present invention investigated the causes of these problems (after conducting various experiments, the following was discovered.

In other words, when a hydrous explosive is used, the phenomenon in which the subsequent explosive stops detonating due to the detonation of the earlier stage is due to the fact that the detonator itself changes due to the detonation pressure of the earlier stage explosion, rather than the explosive itself receiving source pressure and decreasing its sensitivity. , it was found that the explosion was incomplete.

In this case, the detonator causes an incomplete explosion, so
It was also found that the charge in the detonator did not explode.

However, when using dynamite, dynamite is very sensitive, and even the detonator's detonator alone could cause the dynamite to explode, so there were fewer misfires due to source pressure phenomena.

Therefore, the inventor of the present invention conducted tests covering the latter stage detonator with various cylindrical bodies, and found that if it was covered with a metal protective tube, it could be put to practical use without causing the above-mentioned disadvantages. This led to this idea.

In this invention, at one end of a metal cylindrical body that can accommodate a detonator,
The present invention provides a detonator protection tube characterized in that a stopper is provided to prevent the detonator from passing through, and a detonator cap fall prevention portion is provided at the other end.

The metal cylindrical body used in this invention is, for example, a stainless steel pipe, an aluminum pipe, an iron pipe, a brass pipe, a copper pipe, etc., and has an inner diameter slightly larger than the outer diameter of the detonator and is designed to accommodate the detonator. It is about the same length or slightly longer than the detonator.

In the present invention, a stopper S is provided at one end 2 of the metal cylindrical body 1, as shown in FIGS. be.

FIG. 1 shows an example in which the bottom 4 is integrally provided on one end 2 of the metal cylindrical body 1, FIG. 2 shows an example in which the bottom plate 5 is fitted to the one end 2 of the metal cylindrical body 1, and The figure shows an example in which a cover 6 is detachably attached to one end 2 of a metal cylindrical body 1, FIG. An example in which one or more protrusions 8 protruding inward are provided on the inner surface of one end 2 of a metal cylindrical body 1, FIG. An example in which a protruding protrusion 9 is provided, FIG. 7 shows an example in which a taper 10 is provided by narrowing one end 2 of the metal cylindrical body 1, and FIG. 1
This is an example of inserting 1.

Further, the present invention provides a detonator 1 inserted into the metal cylindrical body 1.
4 will not fall off easily, for example, from Figures 9 to 1.
As shown in FIG. 2, an adhesive tape 12 is attached to the detonator insertion opening 3 of the metal cylindrical body 1.

Figure 9 is an example of attaching adhesive tape 12 to one character, the first
Figure 0 shows an example in which a slit 13 is provided in the adhesive tape 12 shown in Figure 9, and Figure 11 shows an example in which the adhesive tape 12 is attached in a cross shape.
FIG. 12 shows an example in which the adhesive tape 12 is provided with a slit 13. FIG. 12 shows an example in which the adhesive tape 12 is attached to the entire surface of the detonator insertion port 3 and the slit 13 is provided in the adhesive tape 12.

The use of the detonator protection tube constructed in this way will be explained.

For example, as shown in FIG. 13, after attaching the adhesive tape 12 to the detonator insertion port 3 of the metal cylindrical body 1 (for convenience, the one in FIG. 9 is used), when the detonator 14 presses the adhesive tape 12, The adhesive tape 12 is cut from the slit 13, and as the detonator moves, the cut adhesive tape 12 is rolled up toward the inner surface of the metal cylindrical body 1, and finally the metal cylindrical body 1 is cut.
It is attached to the inner surface of the body as shown in Fig. 14.

When the detonator 14 comes into contact with the stopper S and the insertion of the detonator 14 is completed, since the adhesive tape 12 is attached to the inner surface, the tip 15 of the detonator 14 is pressed by the non-adhesive part of the adhesive tape 12, and can be easily removed. It is fixed so that it cannot escape from the insertion port 3.

In this way, the detonator 14 and the metal cylindrical body 1 are integrated,
Effectively used as a stage electric detonator.

Next, we will show the test results using the detonator protection tube according to the present invention.

Test method As shown in Figure 15, 50f with an instantaneous electric detonator 16 inserted.
The cartridge 17 is suspended in the water, and the stage detonator (D84 stage) 14 is covered with various protective tubes at a certain distance (14th stage).
The cartridge 19 of No. 5 (H' in the figure) was suspended in water and energized at the same time to check whether the cartridge 19 with the stage detonator 14 attached was normal.

The results are shown in the table.

Here, the shorter the distance between the cartridges 17 and 19, the more effective the protective tube will be.

From this result, it was found that the protective tube made of stainless steel was the best, but it was also found that aluminum, iron, and copper could also be used depending on the degree of protection.

[Brief explanation of the drawing]

1 to 8 are cross-sectional views of the detonator protection tube according to the present invention, FIGS. 9 to 12 are side views showing the detonator protection tube according to the present invention with adhesive tape attached, and FIG. 13 is a sectional view of the detonator protection tube according to the present invention. A perspective view showing a state in which a detonator is inserted into a detonator protection tube according to the present invention, Part 1
FIG. 4 is a sectional view showing a detonator fitted in a detonator protection tube according to the present invention, and FIG. 15 is an explanatory diagram showing a test method. 1: Metal cylindrical body, 2: End, 3: Insertion port, 4: Bottom,
5: Bottom plate, 6: Cover, 7: Plug, 8, 9: Protrusion, 10:
Taper, 11: Pin, 12: Adhesive tape, 13 Nislit, 14: Detonator, 15: Tip, 16: Instantaneous detonator, 17
．． 19: medicine package, 18: water tank, S: stopper.

Claims (1)

[Claims for Utility Model Registration] l. A detonator characterized by having a stopper for preventing the detonator from passing through at one end of a metal cylindrical body capable of accommodating the detonator, and a falling-off prevention part provided at the other end. Protective tube. 2' □ The detonator protection tube according to claim 1, wherein the stopper is provided on a part or all of one end of the metal cylindrical body. 3. The stopper is a detonator protection tube according to claim 2 of the utility model registration claim, in which the bottom is integrally provided at one end of the metal cylindrical body; 4. The stopper is one end of the metal cylindrical body The detonator protection tube according to claim 2 of the utility model registration claim, which is a moat having a bottom portion removably attached to the bottom portion. 5. The detonator protection tube according to claim 2, wherein the stopper is a metal cylindrical body with a protrusion provided at one end. 6. The detonator protection tube according to claim 2, wherein the stopper is a bottle or the like inserted into one end of a metal cylindrical body. 7 S) The detonator protection tube according to claim 2 of the utility model registration, wherein the 7 par is a metal cylindrical body having one end constricted and a recess provided therein. 8. The detonator protection tube according to claim 1, wherein the stopper is a metal cylindrical body whose diameter is reduced by constricting one end thereof. 9. The detonator protection tube according to claim 1 of the utility model registration claim, wherein the falling-off prevention part is a detonator insertion opening of a metal cylindrical body covered with adhesive tape. 10. The detonator protection tube according to claim 9, wherein the adhesive tape has a slit in its center.