JP6399811B2 - Ammunition container having a stitch-like fragile portion - Google Patents

Description

  The present invention relates to a cylindrical ammunition container used, for example, as a packing container for a gun cannon firing charge or a gun ammunition. More specifically, the present invention relates to the ammunition container capable of avoiding the explosion of the container in an emergency when the explosives ignite inside the container while maintaining the drop strength and the air tightness in the normal state.

  As described in the following Patent Document 1, an ammunition container used for a projectile charge for an ammunition can pack and transport a plurality of charge charges loaded with fine granular projectiles. It is a metal container that is temporarily used when stored in an ammunition cabinet. When the propellant is inserted into a chamber such as an enamel shell, the ammunition container is removed from the propellant. In general, an ammunition container as a packing container used for a shooting gun for a cannon or an ammunition for a gun has a structure having a drop strength and airtightness of a certain level or more in consideration of operational aspects.

  In recent years, the ammunition for ammunition and other ammunition for artillery have been desensitized and desensitized for the purpose of minimizing my damage when subjected to fires, hits, etc. during storage, transportation and use. Development of low-sensitivity (hereinafter referred to as IM (Insensitive Munition)) and equipment are being promoted. Further, as an IM property and handling evaluation method of these ammunition, the test method is standardized by ITOP (International Test Operations Procedure) and STANAG (Standardization Agreement, NATO standard) of the United States. In these standards, drop tests, cook-off tests, detonation tests, and fire sensitivity tests are defined as test items for evaluating operational handling. Such regulations need to be satisfied not only for ammunition but also for ammunition containers. Therefore, high IM characteristics and robustness are also applied to ammunition containers for ammunition and gun ammunition. Drop strength and high airtightness are required.

  In Patent Document 2 below, for the purpose of providing a cylindrical ammunition container that can mitigate the combustion reaction of ammunition while maintaining strength, a metal cylindrical shape having a spiral joint portion is provided. In the ammunition container, a cut portion is provided at a position that does not interfere with the joint portion on at least one of the outer peripheral surface and the inner peripheral surface of the cylindrical portion, and the ratio of the depth of the cut portion to the thickness of the cylindrical portion is 0.10. A cylindrical ammunition container is disclosed which is .about.0.95.

  Further, Patent Document 3 below also discloses an opening of a container body having a bottomed cylindrical shape for the purpose of providing a cylindrical ammunition container that can mitigate the combustion reaction of ammunition while maintaining strength. In the metallic cylindrical ammunition container having a helical joint on the cylindrical portion of the container body, the cylindrical portion has a plurality of opening holes at positions where the cylindrical portion does not interfere with the joint. A sealing plate for sealing the opening hole, the sealing plate is set lower than the strength of the cylindrical portion, and the ratio of the total area of the opening portion to the surface area of the outer peripheral surface of the cylindrical portion is 0.02. A cylindrical ammunition container characterized by a value of ˜0.25 is disclosed. Moreover, the aspect whose ratio of the breaking strength of the said sealing board with respect to the breaking strength of the cylindrical ammunition container in which the said opening hole is not provided is 0.1-0.9 is also disclosed.

  Also, in Patent Document 4 below, for the purpose of providing a cylindrical container for ammunition that can mitigate the combustion reaction of ammunition while maintaining the strength, A cylindrical explosive container in which a disc-shaped bottom portion having a cylindrical portion and a disc-shaped lid portion having a cylindrical portion are joined, and the barrel portion with respect to the lower fracture strength of the bottom portion and the lid portion. A cylindrical ammunition container having a fracture strength ratio of 0.09 to 0.50 is disclosed. Moreover, the aspect by which between each cylinder part of the said cover part and a bottom part is connected with the reinforcement member is also disclosed.

  In addition, in Patent Document 5 below, when the propellant stored under impact, heat, or the like explodes, the storage container is destroyed at a predetermined fragile portion so that the opening area due to destruction is as large as possible. In order to provide a container for the propellant charge that can effectively release the pressure and prevent further intense reaction from occurring and prevent the debris from scattering as much as possible. Is a cylindrical body that is welded and integrated or formed in advance in a cylindrical shape, and a container for a propellant charge that includes a bottom member and a lid member that close both ends of the cylindrical body, Storage of a projectile charge in which the cylindrical body has a spiral weakened portion (excluding the welded portion or the welded portion) formed in the length direction on at least one of the inner peripheral surface and the outer peripheral surface Container is disclosed .

  The following Patent Document 6 discloses a cylindrical container with a bottomed shape for the purpose of providing a cylindrical ammunition container that can mitigate the combustion reaction of ammunition and can suppress surrounding damage while maintaining strength. In a metal cylindrical ammunition container having a lid joined to the opening of the main body and a spiral joint to the cylindrical portion of the container main body, the cylindrical portion has at least one position that interferes with the joint. A plurality of through-holes are provided, a sealing plate for sealing the opening holes is provided, and the ratio of the sum of the lengths of the opening holes to the length of the cylindrical portion is 0.25 to 3.0. A cylindrical container is disclosed. Patent Document 5 also discloses an embodiment in which the ratio of the width of the opening hole to the outer diameter of the cylindrical portion is 0.0001 to 0.005.

  Further, Patent Document 7 below discloses an ammunition storage container that is opened when an undesired stimulus is generated in which ammunition burns, and has a top, a bottom, and at least one side surface therebetween, The container contains an explosive therein, the explosive containing energy material and having at least one seam having a joint portion and a non-joint portion on its side; and a non-joint portion of the joint A seal comprising an adhesive or the like for sealing, wherein the seal acts to break when the internal pressure is at least 3 psi above the external pressure before the remainder of the container is broken, thereby The ammunition storage container is disclosed in which the container is opened and the burning rate of the stored energy material is controlled to avoid a violent reaction.

  Further, Patent Document 8 below discloses an ammunition container that can prevent explosion of the container in an emergency when explosives are ignited inside the container and suppress surrounding damage while maintaining the drop strength and airtightness in the normal state. The container for ammunition has a bottomed cylindrical container main body and a lid that closes the opening of the container main body, and the cylindrical portion of the container main body has a spiral metal plate. Is formed in a cylindrical shape having a spirally extending joint portion, and a long hole extending in the axial direction is formed in the cylindrical portion so as to penetrate inside and outside. An ammunition container is disclosed, wherein the long hole is sealed with a sealing material, and the outer surface of the long hole and the sealing material is covered with a metal cover member. Has been.

As described above, it has been proposed to provide various shapes of weakened portions and openings in the cylindrical body of the explosive container. However, only Patent Documents 6 to 8 are linear shapes extending in the axial direction of the cylindrical body. It teaches that a long hole is formed so as to penetrate inside and outside.
However, in any of Patent Documents 6 to 8, a notch groove in which the fragile portion where the stress is concentrated at both ends of the linear elongated hole is not penetrated inside or outside with a predetermined gap. Or in a stitch shape and in a direction of 20 to 160 degrees with respect to the fragile part so as to have a tensile strength of 0.0 to 0.9 times the wall thickness of the container cylinder part, Alternatively, instead of the linear long hole that penetrates the inside and outside, a long hole of a predetermined length is drilled in an inner and outer through shape with a predetermined gap, and the long hole is alternately arranged with a joint portion of a predetermined length in a stitch shape. As a fragile portion, it extends in the axial direction, and in some cases, the fragile portion that bifurcates at both ends of the stitch-like fragile portion that extends in the axial direction and does not penetrate inside or outside with a predetermined gap. In a notch groove shape or stitch shape and In the direction of 20 degrees to 160 degrees with respect Titchi shape fragile portion, it has not been taught or suggested provided. That is, in each of Patent Documents 6 to 8, instead of drilling a linear long hole extending in the axial direction of the cylindrical body in an inner and outer through shape, the long hole of a predetermined length has an inner and outer through shape with a predetermined gap. The long hole is formed into a stitch-like fragile portion extending in an axial direction alternately in a line with a joint portion of a predetermined length, and further, in some cases, a bifurcated or Y-shaped at both ends of the stitch-like fragile portion. There is no teaching or suggestion of providing a vulnerable part.
Here, the fragile portion refers to a portion that is subjected to internal / external penetration processing, cut groove processing, or stitch processing, and has low tensile strength (breaking strength).
Also, the stitch-like weak part is a stitch process (the inner and outer through-holes are formed as long holes and the joint parts where the inner and outer through-holes are not formed are alternately formed in a linear manner) among the weak parts. It refers to a location where the tensile strength (breaking strength) is low.
Moreover, a Y-shaped part means the location where the linear weak part bifurcated into two forks was drilled in the both ends of the stitch-like weak part extended in the axial direction of the cylindrical body.

JP 2004-226031 A JP 2011-145007 A JP 2011-252645 A JP 2012-2381 A JP 2012-17935 A JP 2012-117741 A US Pat. No. 7,624,888 JP 2013-44454 A

As described above, in the conventional ammunition container, when the explosives constituting the ammunition and the projectile charge contained in the container are ignited, the combustion reaction of the explosives in the ammunition container having high airtightness occurs. As a result, the pressure rises and eventually the container explodes, causing a situation where a great deal of damage or loss is caused to surrounding personnel and equipment. As a means for solving the problem, explosives are provided inside the container while providing a weak portion and an opening of various shapes in the cylindrical body of the container for ammunition to maintain the drop strength and airtightness in the normal state. An object of the present invention is to provide a container for ammunition that can prevent explosion of the container in the event of an emergency and suppress surrounding damage.
In addition, as described above, the cited documents 6 and 7 teach that a straight long hole extending in the axial direction of the cylindrical body is drilled as the weakened part or the opening part in the inner and outer penetrating shapes. Depending on the type and shape of the gunpowder to be installed, a considerable amount of long holes are required, and the drop strength and airtightness are not compatible.
Under such circumstances, the problem to be solved by the present invention is to prevent the explosion of the container in an emergency when the explosives ignite inside the container while maintaining the drop strength and airtightness in the normal state, and to damage the surroundings. It is providing the container for ammunition which can be suppressed.

  As a result of intensive studies and repeated experiments to solve the above-mentioned problems, the present inventors have replaced the cylindrical long hole extending in the axial direction with a predetermined shape and a predetermined hole. A long hole having a predetermined length is formed in a penetrating manner inside and outside, and the long hole is formed into a stitch-like fragile portion extending linearly in a line alternately with a joint portion having a predetermined length, and further optionally provided as an interior. A bifurcated or Y-shaped weak part is further provided at both ends of the stitch-like weak part depending on the type and shape of the explosive, and a gap between the inside and outside through-holes of the stitch-like weak part is used instead of the cover member. In addition, the present inventors have found that the above problems can be solved by providing a sealing means, and have completed the present invention.

That is, the present invention is as follows.
[1] An ammunition container having a bottomed cylindrical container main body and a lid for closing the opening of the container main body,
A long hole having a predetermined shape and a predetermined length is formed in the cylindrical portion of the container body so as to penetrate inside and outside with a predetermined gap, and the long hole is alternately arranged with a joint portion having a predetermined length, and at least one stitch-like weak portion It extends in the axial direction,
The gap between the full-length holes in the stitch-shaped fragile portion extending in axial direction, by providing the sealing means, the container has been sealed,
The length of the cylindrical portion of the container body is 600 to 1500 mm, the thickness of the cylindrical portion is approximately 1 mm, the length of the at least one linear stitch-shaped weakened portion is approximately 150 mm or more, The shape is linear, the length of the long hole is about 4 mm to 60 mm, the length of the joint is about 1 mm to 5 mm, and the gap of the long hole is about 0.1 mm.
A container for ammunition as described above.

[2] At both ends of the stitch-like weak portion, each of the stitch-like weak portions is bifurcated and penetrates inside or outside with a predetermined gap or in a notch groove shape or a perforated shape and does not penetrate the stitch-like weak portion. There is a Y-shaped fragile portion where stress concentrates in a direction of 20 to 160 degrees (notch direction) so that the tensile strength is 0.0 to 0.9 times the wall thickness of the container tube portion. The ammunition container according to [1], further provided.

  [3] The ammunition container according to [1] or [2], wherein the shape of the cut portion is linear, curved, L-shaped, or oblique.

[ 4 ] The ammunition according to [2] , wherein the notch length of the Y-shaped fragile portion is approximately 10 mm, and the notch direction is 90 to 135 degrees with respect to the stitch-like fragile portion. container.

[ 5 ] The ammunition container according to any one of [1] to [ 4 ], wherein the sealing means is filling the gap with an adhesive or coating agent that decomposes and burns by heat.

[ 6 ] The container body includes a lid that closes the opening of the container body, and a hinge part welded to the container body and a break pin that breaks when the container internal pressure becomes 0.3 to 1.5 MPa. The ammunition container according to any one of [1] to [ 5 ], which is fixed to the tube portion.

  When the ammunition container having a stitch-like weak part according to the present invention is used, the joint between the long holes is broken in an emergency when explosives ignite inside the container while maintaining the drop strength and airtightness in the normal state. , The explosion of the container can be surely avoided and the surrounding damage can be suppressed. In addition, when an ammunition container is shot, especially if the length of the joint is 3 mm or less, the joint is broken by the impact and connected to form a large elongated hole, thereby further suppressing the increase in the internal pressure of the container. be able to. That is, in the ammunition container having a stitch-like weak portion according to the present invention, the stitch shape can be changed and the stress concentration can be maintained according to the composition and shape of the gunpowder incorporated while maintaining the drop strength and the air tightness in the normal state. By providing the location, it is possible to release the pressure from the low pressure region, it is possible to suppress the combustion rate, and by narrowing the gap of the opening hole, the desired sealing strength is achieved even if a sealing agent is used can do.

It is a perspective view of the container for ammunition of a prior art. In the figure, the gap of the long hole penetrating portion of the container body is shown. It is a perspective view of the container for ammunition which has the stitch-like weak part which consists of a notch part and a junction part concerning this embodiment, and has a non-opening lid. In the figure, A: length of the fragile portion 1, B: length between the fragile portions 1-2, C: length of the fragile portion 2, D: gap between the long holes, E: length per one long hole, F: The length of the joint per long hole and the optional rib provided at the center of the tube are shown. It is a perspective view of the ammunition container which concerns on this embodiment which further has a Y-shaped part in the both ends of a stitch-like weak part. In the figure, G: Y-shaped part notch length, H: Y-shaped part notch direction (angle) 120 degrees. It is explanatory drawing of a shape and a dimension in case the shape of a long hole is curvilinear, L shape, or diagonal shape. It is a figure of the open type lid concerning the present invention. In the figure, hinges and breaking pins are shown. It is the schematic explaining various safety evaluation and them. It is a figure which shows the setup condition of a safety test. It is a figure which shows an example of a safety evaluation test result.

Hereinafter, embodiments of the present invention will be described in detail.
As described above, the ammunition container according to this embodiment is an ammunition container having a bottomed cylindrical container body and a lid that closes the opening of the container body,
A long hole having a predetermined shape and a predetermined length is formed in the cylindrical portion of the container body with a predetermined gap, and the long hole is alternately arranged with a joint portion having a predetermined length. At least one stitch-like weak portion The container is sealed by providing a sealing means in the gap of the full length hole in the stitch-like fragile portion extending in the axial direction as
It is characterized by that.

  The inventor simulated the composition and combustion reaction rate of the explosive incorporated in the container, the internal pressure of the container, the breaking strength of the container material, the opening area of the container, etc. In the structure, there is a case where the pressure release is insufficient in the low pressure region, the safe internal pressure of the container cannot be achieved, the container is not sufficiently airtight, the container is not strong enough, or the safety of the container cannot be secured. I found out. Therefore, instead of the conventional slit structure, “a long hole with a predetermined shape and a predetermined length is formed in a through-hole shape with a predetermined gap, and the long hole is arranged in a line alternately with a joint with a predetermined length. A slit structure composed of at least one stitch-like weakened portion extending in the direction is newly provided.

  Also, if the internal gunpowder burns at once, the pressure release function of the conventional technology also found that the pressure release speed could not catch up, the gunpowder detonated, flying the lid, and injured the surrounding people Therefore, in place of the conventional non-opening type (screw type) lid, FIG. 5 shows. An open lid is provided. The breaking strength of the breaking pin of such an open-type lid can be determined from the composition of the gunpowder incorporated and the burning rate. Patent Document 4 discloses a cylindrical ammunition container in which the ratio of the breaking strength of the trunk portion to the lower breaking strength of the bottom portion and the lid portion is 0.09 to 0.50. That is, in Patent Document 4, the breaking strength of the trunk is lower than the breaking strength of the lid.

  FIG. 1 shows a prior art ammunition container. The lid body is a screw-type non-open type, and the slit is a straight through hole and has a predetermined gap. The gap between the cuts of the stitch-like weak part in the present invention is also defined in the same manner as shown in the figure. An ammunition container (also simply referred to as a container) has a bottomed cylindrical container body and a lid that closes the opening of the container body, and a plurality of ammunition (not shown) are arranged in series inside. It is supposed to be loaded. As the ammunition (propellant), a single base propellant, a double base propellant, a triple base propellant, a multi-base propellant and the like are used. Usually, a reinforcing rim provided to surround the outer surface of the container main body is installed at the axial end of the container main body. As shown in FIGS. It may be additionally installed in the department.

  In the present invention, the container body is made of metal, and the cylindrical portion is formed by winding a long metal long plate in a spiral shape so that both side edges are abutted and joined by seam welding or the like. It can be formed in a shape. Therefore, the cylindrical portion of the container body has a spiral joint extending in the axial direction. The joint extends spirally at an angle of about 20 to 40 ° with respect to the bottom surface of the container body. The material of the metal plate is not particularly limited, and all metals conventionally used in this type of ammunition container can be used, and among them, a highly rigid iron plate is preferable.

  The lid of the prior art is cup-shaped, and the material is not particularly limited as long as the inside of the ammunition container can be sealed. For example, in addition to the same metal as the container body, it is also possible to use plastic, fiber reinforced plastic, resin-impregnated paper, or rubber. The lid body is fitted into the opening of the container body by press-fitting or screwing.

  As described above, the rim is made of the same metal as the container body, and is welded to the outer surface of the container body. The outer peripheral surface shape of the rim is circular and the diameter is the same. When the ammunition container is placed on its side, the rim is in contact with the ground to serve as a fulcrum, and the container main body does not directly contact the ground, which is advantageous in preventing damage to the container main body.

As shown in FIG. 1, a long hole extending in the axial direction is formed in the cylindrical portion of the conventional container body so as to penetrate inside and outside. By having the long hole, when the ammunition is ignited in the ammunition container, the combustion gas is discharged outside the ammunition container through the long hole, thereby suppressing an increase in internal pressure and avoiding the explosion of the ammunition container. It has been said that it can.
However, as described above, the present inventor simulated the composition and combustion reaction rate of the explosive incorporated in the container, the internal pressure of the container, the breaking strength of the container material, the opening area of the container, and the like, and further actually verified As a result, in the slit structure of the prior art, if the length of the long hole is shortened in order to increase the hermeticity of the container, the pressure release becomes insufficient in the low pressure region, and the safe internal pressure of the container cannot be achieved or the pressure release is sufficient. It has been found that if the length of the long hole is increased, the airtightness of the container is not sufficient, the strength of the container is not sufficient, or the safety of the container may not be ensured, and such a conventional slit In place of the structure, “a long hole having a predetermined shape and a predetermined length is formed in a shape that penetrates inside and outside with a predetermined gap, and the long hole is alternately arranged with a joint having a predetermined length and extends in the axial direction. Slit structure consisting of pitch-like fragile portions ", in which further optionally providing new slit structure further comprising a Y-shaped section as a weak portion that branches into two at each end of the stitch-shaped fragile portion.

In FIG. 2, the container for ammunition which has a stitch-like weak part which concerns on this embodiment is shown. A: weak part 1 length, B: length between weak parts 1-2, C: weak part 2 length, D: gap of long hole, E: length per one long hole, F: long hole 1 The length of the joint per piece is defined as shown. In FIG. 2, the shape of the long hole is a straight line.
FIG. 3 shows an ammunition container according to this embodiment further having a Y-shaped portion. In FIG. 3, the additionally provided Y-shaped notch direction H is 120 degrees.
According to the prior art slit structure and the present invention, “a long hole having a predetermined shape and a predetermined length is formed in a through-hole shape with a predetermined gap, and the long holes are alternately arranged with joint portions of a predetermined length and extend in the axial direction. The slit structure consisting of “at least one stitch-like weak part” differs from the former in that the entire long hole is inside and outside through the former, whereas in the latter, only the long hole other than the joint is inside and outside through. To do. Moreover, in this embodiment, when a Y-shaped part is additionally provided in the stitch-like weak part, this point is also different from the slit structure of the prior art. However, the notch in the Y-shaped portion can be a groove with a Y-shaped portion bonding area of 30% or a stitch with a Y-shaped portion bonding area of 30% (not shown). Due to the presence of the stitch-like fragile portion, the ammunition container according to the present embodiment has higher airtightness, improved container strength, and improved safety compared to the conventional ammunition container. ing. When the Y-shaped portion is additionally provided, the notch direction is preferably 90 to 135 degrees.

  In the ammunition container according to this embodiment, the number of stitch-like weak parts may be one, but a plurality (for example, about 2 to 15) may be provided as long as the container strength is maintained (see FIG. 8). ). What is necessary is just to set the length of a stitch-like weak part suitably according to the number of installation. For example, when the number of stitch-like weak parts is relatively small (for example, about 1 to 3), the length can be made long, and when the number is relatively large (for example, 4 or more), the length can be made short. Moreover, when providing two or more stitch-like weak parts, it is preferable to provide at equal intervals in the circumferential direction of a container main body. This is because the combustion gas can be efficiently discharged to the outside. The stitch-like fragile portion is basically linear, preferably linear, but may be formed in a curved shape or a spiral shape. Further, the stitch-like weak portion may be provided in parallel with the axial direction (center axis) of the container body, or may be provided obliquely with respect to the axial direction (center axis) of the container body. In this embodiment, in FIG. 2, two stitch-like weak portions are provided by separating a long straight stitch-like weak portion extending over both axial end portions of the container main body with a rib provided in the central portion of the container. Moreover, in FIG. 3, it forms in parallel with the axial direction (center axis | shaft) of a container main body, and 1 piece is provided in the cylinder part across the rib provided in the container center part. If the length of the at least one stitch-like weak portion is 150 mm or more, the combustion gas can be efficiently discharged to the outside.

  In the ammunition container according to the present embodiment, the shape of the long hole of the stitch-like fragile portion can be linear, curved, L-shaped or oblique. 2 and 3, the long hole is linear. FIG. 4 shows an example of the shape and size of a curved, L-shaped or slanted long hole.

  A plate-like sealing material may be joined to the outer peripheral surface of the cylindrical portion of the conventional ammunition container so as to seal the long hole from the outer surface. The sealing material is larger than the opening area of the long hole, and is bonded to the container main body at the outer peripheral portion of the long hole by adhesion or welding. The sealing material is made of a material having lower strength than the container body. This is because when the ammunition is ignited in the ammunition container, it must be preferentially damaged over other parts as the internal pressure increases. That is, the long hole and the sealing material can be referred to as a fragile portion. For example, for the container body made of steel, the sealing material is made of a soft metal such as aluminum or copper, or a synthetic resin such as polyethylene or polypropylene. The sealing material may be in the form of (aluminum) tape or plate.

  On the other hand, in the ammunition container according to this embodiment, the gap between the elongated hole of the stitch-like weak part and the Y-shaped part additionally provided is preferably reduced to about 0.1 mm and filled with a sealing agent. By doing so, the container may be sealed. If a predetermined sealant is used after narrowing the gap between the opening holes, the desired container airtightness and container strength can be achieved, and there is also a risk in transportation that damages the sealing material such as the aluminum tape. Can be reduced.

  In a preferred embodiment, the length of the cylindrical portion of the container body is 600 to 1500 mm, the thickness of the cylindrical portion is approximately 1 mm, and the length of at least one linear stitch-shaped weakened portion is approximately 150 mm or more, The shape of the long hole is linear, the length of the long hole is about 4 mm to 60 mm, the length of the joint is about 1 mm to 5 mm, preferably 3 mm or less, and the gap of the long hole is about 0.1 mm. Moreover, it is preferable that the length of the said weak part is about 10 mm, and the said notch direction is 90-135 degree | times.

Hereinafter, the operation of the ammunition container according to the present invention will be described.
When handling ammunition containers or during temporary storage, if the ammunition in the ammunition container causes a combustion reaction due to impact or temperature rise, the pressure in the ammunition container is caused by the generated combustion gas. To rise. Then, a sealing agent such as silicon (adhesive), a coating agent, or aluminum tape filled in the gap between the elongated holes of the stitch-like weak part and the additional Y-shaped notch provided by the combustion gas. The means is destroyed, and further, the Y-shaped portion has a desired fragility, so that the opening is made and the combustion gas is discharged to the outside at a container safe internal pressure or less. Thereby, since the increase in the internal pressure of the ammunition container is suppressed, the explosion of the ammunition container is avoided and the safety is improved.
In addition, compared with the fragile portion (long hole) of the prior art, in the stitch-like fragile portion, the gap can be maintained uniformly over the entire axial direction of the container main body cylindrical portion, so that normal handling has been performed so far. At the same time as the sealing with the sealing agent peeled in step S3 is ensured, the presence of the joint can prevent a decrease in container strength.

  Furthermore, in the ammunition container according to the present embodiment, the lid body can be changed from the conventional non-open type (screw type) to the open type shown in FIG. In a preferred embodiment of the present invention, the lid that closes the opening of the container body includes a hinge part welded to the container body, and a breaking pin that breaks when the container internal pressure becomes 0.3 to 1.5 MPa. By this, it is an open type that is fixed to the container body cylinder. As a result, when the explosive contained in the container burns all at once, the pressure release speed cannot catch up with only the pressure release mechanism such as the linear long hole provided in the container body, and the lid body flies nearby. This can reduce the risk of injury to people.

The breaking strength of the hinge part is higher than the breaking strength of the breaking pin, and considering the composition and burning rate of the explosive constituting the internal explosive, by appropriately selecting the material and outer diameter of the breaking pin, the breaking pin The breaking strength of can be adjusted.
Moreover, even if it is an open-type cover body, since the opening of a container main body is closed with this cover body, making the container main body metal, it has fall strength and airtightness similarly to the past.

The present invention will be specifically described by the following examples.
The evaluation methods used in the examples are described below.

[Evaluation of safety]
(Response type)
Response types are classified as follows.
Type I response (detonation): The most severe type of explosive event. Supersonic decomposition reaction (detonation) propagates through the energetic material and generates a strong impact on the surrounding medium (eg air, water). Arise. In addition, a large crater is seen on the ground where the shells are located or nearby, and there are effects such as through-holes in adjacent metal plates, plastic deformation, generation of fragments, blast overpressure damage of neighboring structures, and the like.
Type II response (partial detonation): The second most severe type of explosive event. Some, but not all, of the energetic material causes a type I response. A strong impact occurs, part of the container breaks into small pieces, can create craters on the ground, can cause the same damage to adjacent metal plates as type I responses, and cause blast overpressure damage to neighboring structures . Type II responses can result in large container fragments that resemble severe pressure rupture (brittle fracture). The degree of damage compared to the type I response depends on the detonated ratio of the material.
Type III response (explosion): The third most severe type of explosive event. The ignition and rapid combustion of the encapsulated energetic material generate a high local pressure rise and induce severe pressure rupture in the enclosed structure. Metal containers become large pieces (brittle fracture) and can fly far away. Unreacted energy material is also scattered, and some of them fly while burning. Air shocks can occur, which can damage nearby structures. There are fire and smoke hazards. Blasts and high-speed debris can create small craters on the ground and damage (split, tear, groove-like scratches) on adjacent metal plates. The blast pressure is lower than type I and type II responses.
Type IV response (deflagration): The fourth most severe type of explosive event. The ignition and combustion of the sealed energetic material induces a weak pressure release in the low-strength container and the container wall vents (plug gaps, ignition capsules, etc.). The container ruptures, but does not become a fragment, the lid with the orifice comes off and the unburned energetic material scatters, some of which burn while flying, spread the fire. May cause secondary harm by propelling test items with unrelieved pressure relief. There is no blast effect or significant debris damage in the surrounding area, and the only damage is heat and smoke damage from the burning of energetic materials.
V-type response (burning): The lowest intense type of explosive event. Energetic materials ignite and burn without propulsion. Although the vessel will tear gently, it will melt or weaken, allowing the combustion gas to slowly open and the vessel lid to open with internal pressure. Most debris remains at the fire site. It is unlikely that the wreckage will cause fatal injuries to soldiers or that harmful debris will fly over 15 meters (49 feet).
No reaction.

(Slow cook-off test)
As shown in FIG. 6, as a safety evaluation of the example, a shooting sensitivity test, which is a reactivity evaluation assuming that the charge was shot, was used. Such a shooting sensitivity test was carried out under conditions based on STANAG.

(Test procedure for safety assessment)
As shown in FIG. 7, the propellant was placed in a metal container, the metal container was fixed, a pressure gauge was installed inside the metal container, and the center of the metal container was shot with a 12.7 mm bullet.

(Evaluation of safety)
As shown in FIG. 8, according to the number of fragments after the final reaction, safety was evaluated according to the following evaluation criteria:
○: 0 △: 1 ×: 2 or more (explosion pressure evaluation)
The propellant was placed in a metal container, and a pressure gauge capable of digital output was installed at the bottom, and the maximum pressure value before and after the reaction was evaluated. The explosion pressure was evaluated using Comparative Example 1 as a 100% standard.
FIG. 8 shows an example of the test result.
The burning rate of the explosive is adjusted according to the intended use, depending on the composition (nitroglycerin amount, etc.) and shape (surface area). Therefore, the combustion pressure simulation was performed in consideration of the composition and shape of the explosive, and the internal pressure generated in the container was assumed. The composition (triple base) and shape (granular) were used as the internal propellant.

[Evaluation of container drop strength]
(Drop test)
A test was conducted to allow the packaging container containing the contents to drop naturally from the specified height. Specifically, the propellant is placed in the packaging container so that the specified height (12m, 2.1m, 1.5m) by I-TOP and the specified angle (horizontal, vertical, diagonal) Was set and allowed to fall naturally, and the situation after the fall was judged. The falling ground was made of concrete with an iron plate with a thickness of 20 mm. The operability of the charge after the fall was judged. For example, a packaging container having a long slot is dangerous because the contents (explosives) are released from the deformed portion, and the charge is destroyed and deformed. The ammunition packaging container must have a structure that can safely carry the charge even under various conditions. The drop test is an evaluation index for handling properties during transportation, and has the following three criteria:
The contents should not scatter from the packaging container due to a 12m drop.
Even after falling 2.1m, you should be able to remove the explosive charge and shoot safely.
Even after dropping 1.5 m, the packaging container must have the specified airtightness (0.02 MPa, no air leak) (evaluation of container drop strength)
Container strength was evaluated according to the following evaluation criteria:
◎: Satisfying the above three criteria ○: Satisfying any of the above three criteria but not satisfying criteria ×: Not satisfying the criteria

[Evaluation of airtightness]
In the reconnaissance test shown in Table 1, in order to emphasize airtightness, a long hole of 50 mm is processed in a straight line with a gap of 0.1 mm to 3.0 mm by laser cutting, and various sealants are put in the long hole part, The container was covered, internal pressure was applied, and it was confirmed that air did not leak from the sealed portion. In the examples shown in Table 2, various weak parts shown in Table 2 are processed into a clearance of 0.1 mm by laser cutting, various sealing agents are put into the weak parts, the container is covered, internal pressure is applied, and sealing is performed. It was confirmed that air did not leak from the part. Airtightness was evaluated according to the following evaluation criteria:
◎: No leak at 0.3 MPa ○: No leak at 0.02 MPa △: Partial leak at 0.02 MPa ×: Detachment at normal pressure (no airtightness at normal pressure)

[Evaluation of transportability]
When a metal can is placed on a vehicle, it is loaded using a predetermined jig and transported by the vehicle. Furthermore, it is manually unloaded from the vehicle to the place of use. After moving, we took out the contents from the metal can and confirmed whether there was any difference in the transportation of existing products.
○: Can be transported and operated in the same way as existing products. △: Requires a transporting jig different from existing products, or requires attention during transportation.

Aluminum tape and silicon (adhesive) were used in the following examples, but the following various sealants: urethane (based adhesive), cellulose (based adhesive (cemedine (registered trademark)), epoxy (based adhesive) ), Coating materials were examined in advance.

[Comparative Example 1]
Two long holes with a length of 400mm and a gap of 0.1mm in the cylinder part of the container body are provided with a central rim separated and sealed with aluminum tape, and the safety, explosion pressure, and drop strength of the container sealed with a non-open lid The airtightness and transportability were evaluated by the above-described evaluation test using a low-burning agent. The results are shown in Table 2 below. Further, the explosion pressure in Comparative Example 1 was taken as a 100% standard. The gap between the long holes spreads to about 0.8mm, and the airtightness is reduced. However, the airtightness is ○ because it is reinforced and sealed with aluminum tape, and when transporting, the sealing part is made of aluminum tape. The transportability was Δ, and the central rim absorbed the drop impact, so the drop strength was ○, and the safety was ○.

[Comparative Example 2]
The test was performed in the same manner as in Comparative Example 1 except that the length of the fragile portion was changed to 150 mm. The results are shown in Table 2 below. The explosion pressure was 270%, the airtightness was ◯, the transportability was △, the drop strength was ◯, the lid was flying and some fragments were generated, and the safety was △.

[Comparative Example 3]
The test was conducted in the same manner as in Comparative Example 2 except that the lid was replaced with an open lid. The results are shown in Table 2 below. The explosion pressure was 280%, the airtightness was ◯, the transportability was △, the drop strength was ◯, and the scattering of the lid part was suppressed, and the safety was ◯.

[Example 1]
Two stitch-like weak parts with a length of 400 mm and a gap of 0.1 mm are provided in the cylinder part of the container body with a central rim separated, and each stitch-like weak part has a length of 20 mm per long hole, between the long holes. The test was performed in the same manner as in Comparative Example 1 except that a long hole having a joint length of 1 mm was formed in a linear shape. The results are shown in Table 2 below. Since the joint of the stitch-like fragile part was broken by impact of landing and the long hole similar to Comparative Example 1 was formed, the internal reaction proceeded. Therefore, the explosion pressure was 100%. Since the gap between the holes did not widen, as in Table 1, the airtightness was ◎, the drop strength was 運 搬, the transportability was Δ, and the safety was ◯ as in the comparative example. Compared to Comparative Example 1, airtightness and drop strength were improved.

[Example 2]
The test was performed in the same manner as in Example 1 except that the sealant was changed from the aluminum tape to the silicon adhesive. The results are shown in Table 2 below. Since the joint portion of the stitch-like fragile portion was broken by the impact of landing, the explosion pressure was not changed to 100%, the airtightness was ◎, the transportability was ○, the drop strength was ◎, and the safety was ○. Compared with Example 1, it turned out that a transportability improves.

[Example 3]
The test was performed in the same manner as in Example 2 except that the joint length of the stitch-like weak part was increased from 1 mm to 2 mm. The results are shown in Table 2 below. Since the joint part of the stitch-like fragile part was broken by the impact of impact, the explosion pressure did not change, the airtightness was ◎, the drop strength was ◎, the safety was ○, the transportability was improved, and ○.

[Example 4]
The test was performed in the same manner as in Example 2 except that the joint length of the stitch-like fragile portion was increased from 1 mm to 3 mm. The results are shown in Table 2 below. Since the joint portion of the stitch-like fragile portion was broken by the impact of landing, the explosion pressure was not changed from 100% compared to Example 2, and the same result as in Example 2 was obtained.

[Example 5]
The test was conducted in the same manner as in Example 2 except that the joint length of the stitch-like weak part was increased from 1 mm to 5 mm. The results are shown in Table 2 below. In the impact of landing, since the joint part of the stitch-like weak part was not broken, the explosion pressure was increased to 270% compared to Example 2, and the lid body was scattered, so the safety was Δ.

[Example 6]
The test was conducted in the same manner as in Example 5 except that the lid was changed from a non-open type to an open type (screw type). The results are shown in Table 2 below. Since the joint portion of the stitch-like fragile portion is not broken by the impact of landing, the explosion pressure is 280%. However, the scattering of the lid body is suppressed, so the safety is good.

[Example 7]
The test was conducted in the same manner as in Example 2 except that a long hole having a length of 60 mm per long hole in the stitch-like weak part and a joint length of 5 mm between the long holes was drilled linearly. The results are shown in Table 2 below. The joint portion of the stitch-like fragile portion does not break due to the impact of impact landing, but since the total joint length is shorter than in Example 6, the stress applied to the joint portion is concentrated and it is easy to break. The safety dropped to 125%, and the safety became ○.

[Example 8]
The test was conducted in the same manner as in Example 2 except that the length of the stitch-like weak part was extended to 900 mm. The results are shown in Table 2 below. Compared to Example 2, the explosion pressure decreased to 95%.

[Example 9]
The test was conducted in the same manner as in Example 8 except that the central rim was removed. The results are shown in Table 2 below. Compared to Example 8, the explosion pressure decreased to 80% due to the large opening of the pressure release port, and the drop strength decreased to Δ by removing the rim.

[Example 10]
The test was conducted in the same manner as in Example 8 except that a weak portion similar to the main body was provided in the central rim at the same location as the main body stitch-like weak portion. The results are shown in Table 2 below. Compared to Example 8, the explosion pressure decreased to 85%.

[Example 11]
The test was conducted in the same manner as in Example 2 except that the shape of the long hole was changed from a straight line to a curved line. The results are shown in Table 2 below. The result was the same as in Example 2.

[Example 12]
The test was performed in the same manner as in Example 2 except that the shape of the long hole was changed from a straight line to an L-shape. The results are shown in Table 2 below. The result was the same as in Example 2.

[Example 13]
The test was performed in the same manner as in Example 2 except that the shape of the long hole was changed from a straight line to an oblique direction. The results are shown in Table 2 below. The result was the same as in Example 2.

[Example 14]
The test was performed in the same manner as in Example 2 except that the shape of the long hole at both ends of the stitch-like weak portion was changed from the straight line to the Y-shape in FIG. The results are shown in Table 2 below. Compared with Example 2, the explosion pressure was reduced to 70% by releasing the pressure from a low pressure.

  By using an ammunition container having a stitch-like fragile portion according to the present invention, it is possible to reliably avoid explosion of the container in an emergency when explosives ignite inside the container while maintaining the drop strength and airtightness in the normal state. Can prevent damage. Further, when the ammunition container is shot, the joint is broken and connected by the impact to form a large elongated hole, thereby suppressing the increase in internal pressure. That is, in the ammunition container having a stitch-like weak portion according to the present invention, it is possible to realize pressure release from a low pressure region by providing a stress concentration location and a narrow joint portion according to the composition and shape of the explosive to be installed. The combustion rate can be suppressed, and by providing the joint portion, the gap between the opening holes can be kept thin, and a desired sealing strength can be achieved even if a sealing agent is used. Therefore, the present invention can be suitably used as an ammunition container.

A fragile part 1 length B fragile part 1-2 length C fragile part 2 length D gap between long holes E length per one long hole F joint length per one long hole G Y cut Notch length H Y-shaped notch direction

Claims (6)

An ammunition container having a bottomed cylindrical container body and a lid for closing the opening of the container body,
A long hole having a predetermined shape and a predetermined length is formed in the cylindrical portion of the container body so as to penetrate inside and outside with a predetermined gap, and the long hole is alternately arranged with a joint portion having a predetermined length, and at least one stitch-like weak portion It extends in the axial direction,
The gap between the full-length holes in the stitch-shaped fragile portion extending in axial direction, by providing the sealing means, the container has been sealed,
The length of the cylindrical portion of the container body is 600 to 1500 mm, the thickness of the cylindrical portion is approximately 1 mm, the length of the at least one linear stitch-shaped weakened portion is approximately 150 mm or more, The shape is linear, the length of the long hole is about 4 mm to 60 mm, the length of the joint is about 1 mm to 5 mm, and the gap of the long hole is about 0.1 mm.
A container for ammunition as described above. At both ends of the stitch-like fragile portion, each branch is bifurcated and penetrated inside or outside with a predetermined gap or in a notch groove shape or perforated shape not penetrating and 20 degrees to the stitch-like fragile portion A Y-shaped fragile portion where stress is concentrated is further provided in a direction of 160 degrees (notch direction) so that the tensile strength is 0.0 to 0.9 times the wall thickness of the container tube portion. The ammunition container according to claim 1.   The ammunition container according to claim 1 or 2, wherein the shape of the elongated hole is linear, curved, L-shaped, or oblique. The ammunition container according to claim 2 , wherein the notch length of the Y-shaped weak part is approximately 10 mm, and the notch direction is 90 to 135 degrees with respect to the stitch-like weak part. The ammunition container according to any one of claims 1 to 4 , wherein the sealing means is filling the gap with an adhesive or a coating agent that decomposes and burns by heat. A lid that closes the opening of the container main body has a hinge part welded to the container main body and a break pin that breaks when the internal pressure of the container reaches 0.3 to 1.5 MPa. The ammunition container according to any one of claims 1 to 5 , which is fixed.