JP2699286B2 - How to adjust the packing density of explosive packages - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for adjusting the packing density of explosive packages, and more particularly, to the manufacture of explosive packages for industrial blasting operations such as an ammonium nitrate explosive package filled in a synthetic resin cylinder. The present invention relates to a method for adjusting the packing density of an explosive package for freely adjusting the density of an explosive.

[Conventional technology]

Explosives for nitric acid oil explosives are made by impregnating light oil into granular ammonium nitrate (ammonium nitrate), and are usually filled in oil-resistant synthetic resin film cylinders (poly cylinders) for quarrying, mining, civil engineering, etc. Used for blasting operations.

In general, an ammonium nitrate explosive package must be filled so that each part of the plastic cylinder has a density as uniform as possible. For this reason, when filling, press the body of the plastic cylinder by hand and fill it so that it feels hard, but as time passes, the whole plastic cylinder becomes soft and it may be inferior as a product .

At the time of filling, in order to make it even harder (to increase the density of the explosive), work such as hitting the bottom of the plastic cylinder or giving vibration is performed.

JP-B-36-4994 discloses a technique related to a vibration-type filling machine for uniformly filling a powder cylinder such as an explosive into a paper cylinder by vibration.

[Problems to be solved by the invention]

When the explosive is charged into a plastic cylinder, the method of hitting or vibrating the bottom of the plastic cylinder has a limit in properties even if the packing density is to be further increased (hardened). Although it becomes hard, the upper side remains unchanged and does not become hard. That is, there is a disadvantage that the filling density becomes non-uniform in each part in the vertical direction of the poly cylinder. Also, doing such work is extra time-consuming and inefficient,
Further, vibration, friction, impact and the like are applied to the explosive, which is not preferable from the viewpoint of safety.

The inventor of the present invention has diligently studied the problems related to the conventional method of filling explosive packages, and has found that the filling density can be adjusted by expanding and contracting the synthetic resin cylinder by pressurization and decompression, and completed the present invention.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for adjusting the density of an explosive package that can make the entire explosive package uniform in density, that can be safely handled, and that can improve work efficiency.

[Means for solving the problem]

In order to achieve the above object, a method for adjusting the packing density of an explosive package of the present invention includes an expandable and contractible synthetic resin cylinder having an opening having an open end and a sealed end. Is filled with explosives, and a pressurized degassing pipe connected to a pressurizing device for sending pressurized air to the opening of the synthetic resin cylinder and a vacuum device for degassing is inserted and sealed. Pressurized air is sent through a degassing pipe to expand the synthetic resin cylinder, and then degassed to shrink the synthetic resin cylinder.

[Action]

According to the present invention, after the synthetic resin cylinder filled with the explosive is pressurized through the pressure degassing pipe and then degassed, the expansion and contraction of the synthetic resin cylinder is performed, and the explosive package is entirely It can be adjusted to a uniform packing density, can be handled safely without giving vibration, friction, impact, etc., and can be manufactured in a short time with improved work efficiency.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

FIG. 1 is a configuration diagram of an apparatus for manufacturing an explosive package according to an embodiment of the present invention,
2 (a) to 2 (d) are manufacturing process diagrams of the explosive package of the embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes an elongated synthetic resin cylinder whose upper end is opened and its lower end is sealed, 12 denotes an ammonium nitrate explosive charged in the synthetic resin cylinder 11, and 13 denotes an upper end of the synthetic resin cylinder 11. Elongate pressurized deaeration pipe which is inserted into the opening 11a of the part and twisted around the opening 11a, 14 is a switching valve, 15 is a pressurizing device for sending compressed air, 16 is a degassing device It is a vacuum device.

The explosive package of the synthetic resin cylinder 11 has, for example, an outer diameter of
An oil-resistant synthetic resin film cylinder having a diameter of about 20 mmφ to 80 mmφ is used, and for example, is filled with an ammonium nitrate explosive 12 weighing about 100 g to 2250 g. Pressure degassing pipe
A pressurizing device 15 and a vacuum device 16 are connected to an outer end side of 13 via a switching valve 14.

Then, at the time of manufacturing the explosive package, as shown in FIG. 2 (a), the interior of the synthetic resin cylinder 11 is filled with the nitrate explosive 12 by a filling machine or the like by a usual method.

Next, as shown in FIG. 2 (b), the distal end of the pressurized degassing pipe 13 to which the pressurizing device 15 and the vacuum device 16 are connected via the switching valve 14 is connected to the synthetic resin cylinder 11 Into the opening 11a, and the opening 11a is twisted to wind the pressure / degassing pipe 13.

Next, as shown in FIG. 2 (c), the switching valve 14 is switched to the pressurizing device 15 side. Send inside.
The inside of the synthetic resin cylinder 11 is pressurized by compressed air and expands to increase the internal volume. As a result, the upper surface position of the nitrous acid explosive 12 before pressurization (A
) Changes to a lower position (a position indicated by a solid line B in the figure) by the amount that the volume expands after pressurization.

Next, as shown in FIG. 2 (d), when the switching valve 14 is switched to the vacuum device 15 side, the air above the synthetic resin cylinder 11 is instantaneously Exhausted through. As a result, the pressure inside the synthetic resin cylinder 11 is released, so that the expanded synthetic resin cylinder 11 contracts, and from the periphery of the nitric acid oil explosive 12 while maintaining the upper surface position (the position indicated by B). Pressure is applied by the synthetic resin cylinder 11.
As a result, the hardness of the upper and lower sides of the synthetic resin cylinder 11 is not uneven, and the density becomes uniform throughout, so that the synthetic resin cylinder 11 is firmly accommodated inside the synthetic resin cylinder 11.

According to the above-described method for filling the explosive package, while the packing density of the explosive package in the synthetic resin cylinder 11 is conventionally adjusted by vibration or hitting the bottom, the degassing is performed after the synthetic resin cylinder 11 is pressurized. With only this, the explosive package could be adjusted to a uniform packing density as a whole, and it was manufactured hard and had a good appearance. Moreover, it is safe without vibration, friction, impact, etc.
In addition, the work efficiency has been improved and the production can be performed in a short time.

The above method is applied to the case where the outer shape with the largest production volume is 50mmφ and the weight is
Good results were obtained when incorporated into an automatic filling machine to produce 750g explosive packages. The packing density required for the explosive package is the size of the synthetic resin cylinder 11, the film thickness,
Adjustment can be freely performed by appropriately changing the pressurizing pressure according to the type of resin and the like.

In the above embodiment, the description has been made of the nitrite explosive 12 as an example, but the scope of the present invention is not limited to this, and the present invention is also applicable to other types of explosives filled in a synthetic resin cylinder.

Further, the opening 11a of the synthetic resin tube 11 is twisted to wind the pressure degassing pipe 13;
May be mechanically clamped from the outside after being inserted into the synthetic resin tube 11, as long as it is sealed at least so that air does not escape from around the pressure degassing pipe 13.

Further, the pressurization and deaeration may be repeated not only once but also several times through the pressurized and deaerated pipe 13, so that the density can be further stabilized.

〔The invention's effect〕

As described above, according to the present invention, a synthetic resin cylinder filled with explosives is pressurized and degassed through a pressurized degassing pipe, and is repeatedly expanded and contracted, so that the explosive package is made uniform throughout. It can be adjusted to the packing density, is safe without vibration, friction, impact, etc., and is easy to handle.
In addition, there is an effect that the working efficiency can be improved and the manufacturing can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an explosive package manufacturing apparatus according to an embodiment of the present invention, and FIGS. 2 (a) to 2 (d) are manufacturing process diagrams of the explosive package according to the embodiment of the present invention. In the figure, reference numeral 11 denotes a synthetic resin cylinder, 11a denotes an opening, 12 denotes an ammonium nitrate explosive, 13 denotes a synthetic resin cylinder, 14 denotes a switching valve, 15 denotes a pressurizing device, and 16 denotes a vacuum device.

Claims (1)

(57) [Claims] An explosive is charged into an inflatable and contractible synthetic resin cylinder having an opening with one end opened and the other end sealed. Insert a pressurized degassing pipe connected to a pressurizing device that sends pressurized air and a vacuum device that degass and seal it, and send pressurized air through this pressurized degassing pipe to send a synthetic resin cylinder. A method for adjusting the packing density of an explosive package, comprising expanding and then degassing to shrink the synthetic resin cylinder.