JP6439426B2 - Propellant container - Google Patents

Description

The present invention relates to a cylindrical container for a propellant used, for example, as a packing container for a gun cannon or an artillery ammunition.

  An ammunition container used for an ammunition cannon is used to pack a plurality of projectiles loaded with fine granular projectiles for temporary transportation when transported or stored in an ammunition depot. It is a metal container to be used. The ammunition container is removed when the propellant is inserted into a chamber such as an howitzer. On the other hand, ammunition containers in the field of artillery ammunition are used for exteriors such as missiles and are also called motor cases. A missile is a unit in which a liner is affixed to the inner surface of an ammunition container and a propellant is cast inside it, and is stored in a storage container called a canister and mounted on a submarine, etc. It is. Therefore, the ammunition container used as the packing container is stored in a state where it is integrated with the propellant until the missile is launched. 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, gunpowder ammunition and artillery ammunition have been required to have good handling at the time of storage and operation because of overseas dispatch activities based on peace-contributing activities. As a method for evaluating the handling of artillery ammunition and ammunition, test methods are standardized by the International Test Operations Procedure (ITOP) in the United States. In this standard, a drop test and a vibration test are defined as test items for evaluating the handling property in operation. In order to satisfy such regulations, a solid drop strength and high airtightness are required for ammunition containers for ammunition and gun ammunition.

  However, in conventional ammunition containers, if the explosives composing the ammunition or the propellant charged inside the container ignite, the combustion reaction of the explosives occurs in the highly airtight ammunition container. The container itself will explode like ammunition, causing serious damage and loss to surrounding personnel and equipment.

  Thus, there is Patent Document 1 as an ammunition container that can suppress surrounding damage by relaxing the combustion reaction of ammunition while maintaining a certain drop strength. Specifically, it is an ammunition container having a bottomed cylindrical container body and a lid that closes the opening of the container body, and a slit made of a single line extending in the axial direction is formed in a cylindrical portion of the container body. Is formed. The slit may be provided at a plurality of locations, and the ratio (Σx / L) of the sum (Σx) of the slit length x to the length L of the cylindrical portion is 0.25 to 3.0, The ratio (y / D) of the slit width y to the outer diameter D of the cylindrical portion is designed to be 0.001 to 0.05.

JP 2012-117741 A

  However, although it is said in Patent Document 1 that a plurality of slits may be provided, each slit itself is composed of one continuous opening hole. In this case, the strength of the container main body is lowered by the amount of the slits provided, so that the drop strength of the ammunition container remains uneasy. Further, due to the deformation at the time of dropping, the sealing material may be broken and the airtightness may be impaired.

  Moreover, although attention is paid to the sum (Σx) of the slit length x with respect to the length L of the cylindrical portion, attention is not paid to the length of the slit itself. Even if (Σx / L) is within a predetermined range, if the length of the slit itself is too short, the combustion gas of explosives is totally discharged in the axial direction from one end of the ammunition container to the other end. Since there may be cases where it cannot be efficiently released to the outside, there remains concern about safety at the time of ignition.

The present invention has been made to solve the above problems, while more reliably secure the dropping strength and the air tightness during the normal, container propellant which can guarantee the safety at the time of explosives inside the container has fired The purpose is to provide.

  As a means for this, the present invention has a bottomed cylindrical container body and a lid for closing the opening of the container body, and a plurality of opening holes extend in the axial direction in the cylindrical portion of the container body. A container for ammunition in which perforated slits are formed in a straight line, wherein the length of the container body is L0, the length of the slit is L1, and the length of the non-opening between the openings. When A1 is A1, 0.60 ≦ L1 / L0 ≦ 0.95 and the relationship of 0.080 ≦ A1 / L1 ≦ 0.300 are simultaneously satisfied. In the present invention, “length” means the dimension in the axial direction (longitudinal direction) of the ammunition container.

According to propellant container according to the present invention, the ratio of the length of the container body length of the slit with respect to (L0) (L1), the total length of the non-opening portion to the length of the slit (L1) of (ΣA1) By designing the ratio within the specified range, the explosives can be prevented from exploding in the event of an emergency when explosives ignite inside the container, while ensuring the drop strength and airtightness during normal operation. Safety can also be ensured.

FIG. 3 is a partially cutaway side view of the ammunition container of the first embodiment. FIG. 3 is a partially cutaway side view of the ammunition container of the first embodiment. FIG. 3 is a partially cutaway side view of the ammunition container of the first embodiment.

  Hereinafter, representative embodiments of the present invention will be described. As shown in FIG. 1, the ammunition container 1 of the first embodiment has a bottomed cylindrical container body 10 and a lid body 11 that closes the opening of the container body 10, and a plurality of ammunition inside. Alternatively, a projectile charge (not shown) is loaded side by side in series. 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.

  The container body 10 is made of metal, and its cylindrical portion 10a is formed into a cylindrical shape by winding a long strip-shaped long metal plate in a spiral shape, but its both side edges are butted together and joined by seam welding or the like. Is formed. Therefore, the cylindrical part 10a of the container body 10 has a spiral joint part (joining line) 10b continuous from one end to the other end. The joint portion 10b extends spirally at an angle of about 20 to 40 ° with respect to the bottom surface (the right end surface in FIG. 1) of the container body 10. The material of the metal plate is not particularly limited, and all metals conventionally used in this type of ammunition container can be used. Among them, a steel plate having high rigidity is preferable. The thickness of the container body 10 can be the thickness conventionally used for this type of ammunition container. If the thickness of the container main body 10 is too thick, the weight of the container main body 10 itself increases, which causes troubles during transportation and handling. Therefore, the thickness of the container main body 10 is generally 0.8-3. 2 mm.

  The lid 11 is cup-shaped, and the material is not particularly limited as long as the inside of the ammunition container 1 can be sealed. For example, in addition to the metal similar to the container body 10, it is also possible to use plastic, fiber reinforced plastic, resin-impregnated paper, or rubber. The lid 11 is fitted into the opening of the container body 10 by press fitting or screwing.

  In addition, a slit 20 extending in the axial direction is formed in the cylindrical portion 10 a of the container body 10. The slit 20 has a perforated shape (broken line shape) in which a plurality of opening holes 20a are arranged on the same straight line, and each opening hole 20a is drilled through the cylindrical portion 10a. As a result, when the ammunition is ignited in the ammunition container 1, the increase in internal pressure can be suppressed by positively releasing the combustion gas to the outside of the ammunition container 1 through the respective opening holes 20 a, and the ammunition container 1 Explosion can be avoided. On the other hand, since the slit 20 is formed in a perforated shape, a non-opening portion 20b exists between the opening holes 20a. Thereby, drop strength becomes higher than the case where the slit which consists of a continuous single line is formed.

  The shape of each opening 20a can be a rectangle or an ellipse that is long in the axial direction, or a circle or a square. Among them, a rectangle or an ellipse that is a substantially linear shape that is long in the axial direction is preferable. In the first embodiment, among the plurality of joint portions 10b existing at a predetermined pitch from one end to the other end of the container body 10 on the straight line on which the slit 20 is formed, the one that interferes (crosses) the opening hole 20a. And those that do not interfere.

  Here, the length of the container body 10 is L0, the length of the slit 20 is L1, the length of each opening hole 20a is A0, and the length of the non-opening portion 20b existing between the opening holes 20a (adjacent openings When the distance between the holes 20a is A1, the ratio of the length L1 of the slit 20 to the length L0 of the container body 10 (L1 / L0) is 0.60 ≦ L1 / L0 ≦ 0.95, preferably 0 70 ≦ L1 / L0 ≦ 0.95. When (L1 / L0) is less than 0.6, the length L1 of the slit 20 is too short with respect to the length L0 of the container main body 10, so that when the explosives are ignited in the ammunition container 1, the combustion gas However, it is not efficiently released from the entire ammunition container 1, and the danger of the ammunition container 1 exploding increases and the safety at the time of ignition is insufficient. On the other hand, when the upper limit of (L1 / L0) is larger than 0.95, it interferes with the fitting portion of the lid body 11, and when the explosives are ignited, the fitting portion is deformed, and the lid body 11 is scattered to cause ignition. Insufficient safety.

  At the same time, the sum (ΣA1) of the length A1 of the non-opening portion 20b with respect to the length L1 of the slit 20 is 0.080 ≦ ΣA1 / L1 ≦ 0.300, preferably 0.120 ≦ ΣA1 / L1 ≦ 0.200. Design to meet relationships. Thereby, since the strength reduction by forming the slit 20 can be suppressed to the minimum necessary while ensuring the safety at the time of ignition by providing the slit 20, the drop strength can also be reliably ensured. On the other hand, if (ΣA1 / L1) is less than 0.080, the drop strength of the ammunition container 1 is insufficient, and if it exceeds 0.300, the pressure required for opening the slit 20 is too high and the safety at the time of ignition is insufficient. To do.

  As long as the above two conditions are satisfied at the same time, the number of openings 20a is not particularly limited. For example, it can be freely designed in the range of 3 to 30, preferably 4 to 25. Moreover, in the range which satisfy | fills the said 2 conditions simultaneously, the length of each opening hole 20a can be freely designed in the range of 10-200 mm, Preferably it is 20-160 mm. Although the length of each opening hole 20a and each non-opening part 20b does not necessarily need to be unified, it is preferable that all the opening holes 20a and the non-opening part 20b have the same length. The width of each opening 20b (circumferential dimension in the ammunition container) may be freely designed in the range of 0.05 to 7.0 mm, preferably 0.1 to 5.0 mm.

  Furthermore, at least one slit 20 may be provided, but a plurality (for example, about 2 to 4) may be provided. When a plurality of slits 20 are provided, it is preferable to provide the slits 20 at equal intervals in the circumferential direction of the container body 10. This is because the combustion gas can be efficiently discharged to the outside. Further, as long as the slit 20 extends in the axial direction of the ammunition container 1, it can be provided not only in parallel to the axial direction but also obliquely.

  In addition, although not shown in figure, the sealing material which seals each opening hole 20a of the slit 20 is joined to the outer peripheral surface or inner peripheral surface of the cylinder part 10a, in order to ensure the airtightness of the container 1 for ammunition. The The sealing material can individually seal each opening hole 20a, or can be used to join a plurality of relatively short ones such as sealing a plurality, but from the viewpoint of productivity, It is preferable to seal all the opening holes 20a with one long sealing material. What is necessary is just to join a sealing material to the container main body 10 by adhesion | attachment or welding. The sealing material is a material having a lower strength than the container body 10. This is because when the ammunition is ignited in the ammunition container 1, it must be damaged preferentially over other parts as the internal pressure increases. For example, for the steel container body 10, 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 tape-shaped or plate-shaped.

  Next, the operation of the ammunition container 1 having the above configuration will be described. When the ammunition container 1 is handled during transportation or temporary storage, if the ammunition or projectile in the ammunition container 1 causes a combustion reaction due to impact or temperature rise, the ammunition is generated by the generated combustion gas. The pressure in the container 1 increases. Then, the slit 20 is opened because the sealing material is preferentially damaged by the high pressure of the combustion gas, and the combustion gas is positively released to the outside through the slit 20. Thereby, the internal pressure rise of the ammunition container 1 is suppressed, the explosion of the ammunition container 1 is avoided, and the safety at the time of ignition is ensured. On the other hand, the ratio of the length L1 of the slit 20 to the length L0 of the container main body 10 and the ratio of the sum (ΣA1) of the length A1 of the non-opening portion 20b to the length L1 of the slit 20 satisfy a predetermined condition. Even if the ammunition container 1 falls to the ground during transportation or the like, since the drop strength is secured, damage and loss of airtightness are avoided.

  As mentioned above, although typical embodiment of this invention was described, it is not restricted to this, A various change is possible in the range which does not deviate from the summary of this invention. For example, in the first embodiment, the joint portion 10b that interferes (crosses) the opening hole 20a and the joint portion 10b that does not interfere with each other are mixed. However, like the ammunition container 2 of the second embodiment shown in FIG. On the straight line on which 20 is formed, all of the joint portions 10b among the plural joint portions 10b existing at a predetermined pitch from one end to the other end of the container body 10 can be formed so as to interfere with the opening hole 20a. . Conversely, as in the ammunition container 3 of the third embodiment shown in FIG. 3, among the plurality of joint portions 10 b existing at a predetermined pitch from one end of the container body 10 to the other end on the straight line on which the slit 20 is formed. In addition, all the joint portions 10b can be formed so as not to interfere with the opening holes 20a.

  In addition, in order to further avoid damage when the ammunition container is dropped and improve ease of transportation, the container body 10 is provided by welding or the like so as to surround the outer surface of the container body 10 at the axial end or center. A handle-like rim can also be provided.

As the container body, a spiral steel pipe metal container formed of a cold rolled steel plate was used, and its opening was closed with a cold rolled steel plate lid to obtain an ammunition container. Cold rolled steel has a tensile strength of 270 N / mm ² , an inner diameter of the container body of 159 mm, a length L0 of 1126 mm, and a wall thickness of 1.2 mm. The joint part of the container body is inclined by 30 ° with respect to the bottom surface.

  As a sealing material for sealing the slit, an aluminum tape having a thickness of 0.5 mm and an adhesive strength of 7.9 N / 10 mm was used. Both ends of the sealing material were arranged at positions of 15 mm from both ends of the slit so that the length of the sealing material was 30 mm longer than the length L1 of each slit.

  Inside the ammunition container, 13 kg of triple base propellant mainly composed of nitrocellulose, nitroglycerin and nitroguanidine was accommodated. This triple base propellant is formed in a hexagonal 19-hole shape, and has a diameter of 14 mm, a length of 14 mm, and an inner diameter of 0.5 mm.

  In addition, one slit was formed in the container body in parallel with the axial direction under the conditions shown in Tables 1 and 2, and the drop strength and the safety during ignition were evaluated as follows. The results are also shown in Tables 1 and 2. In addition, what has not interfered with what has interfered with the junction part of the container main body is mixed in each opening hole.

(Drop strength)
The ammunition container was dropped from a height of 2.1 m while being parallel to the ground, and evaluated according to the following criteria.
A: The container body was hardly deformed, and the aluminum tape was not torn.
○: The container body was deformed small, but the aluminum tape was not torn.
X: The container body was greatly deformed and the aluminum tape was torn.

(Safety at ignition)
0.02kg of black powder was placed in the triple base propellant as an igniter, and a safety test at the time of ignition was conducted.
(Double-circle): The slit was opened and the explosion container did not explode without fragmentation.
The spray distance of the propellant in the container was less than 10 m.
○: The ammunition container did not explode without opening the slit.
The spray distance of the propellant in the container was 10 m or more.
X: The ammunition container was scattered as two or more pieces and exploded.

  From the results of Table 1, in Examples 1 to 12 in which slits having conditions satisfying the condition of 0.60 ≦ L1 / L0 ≦ 0.95 and 0.080 ≦ A1 / L1 ≦ 0.300 were simultaneously formed, Strength and safety at the time of ignition were guaranteed.

  On the other hand, Comparative Example 1 was provided with only one continuous (not perforated) slit, so that the drop strength was insufficient. In Comparative Example 2, since (L1 / L0) was too small, the safety at the time of ignition was poor. In Comparative Example 3, since (L1 / L0) is too large, it interferes with the fitting part of the lid, and when the explosives are ignited, the fitting part is deformed and the lid is scattered, resulting in insufficient safety during ignition. Was. Moreover, since the comparative example 4 (sum of A1 / L1) was too small, drop strength was bad. On the other hand, in Comparative Example 5, since (sum of A1 / L1) was too large, the safety at the time of ignition was poor.

1 ・ 2 ・ 3 Ammunition Container 10 Container Body 10a Tube 10b Joint 11 Lid 20 Slit 20a Open Hole 20b Non-Open

Claims (1)

A perforated shape having a bottomed cylindrical container body and a lid for closing the opening of the container body, and a plurality of opening holes arranged in the same straight line extending in the axial direction in the cylindrical portion of the container body A propellant container in which a slit is formed,
When the length of the container body is L0, the length of the slit is L1, and the length of the non-opening portion between the opening holes is A1,
0.60 ≦ L1 / L0 ≦ 0.95
0.080 ≦ sum of A1 / L1 ≦ 0.300
A container for propellants that satisfies the above relationship.

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