JP2011220575A - Burn-out container of simple structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new burn-out container having more excellent combustibility than that of the conventional burn-out container by having a simple and simplified construction while having strength the same as that of the conventional burn-out container.SOLUTION: In the cylindrical burn-out container 1 constituted of a burn-out container body 3, an burn-out caps 2 to be lids of the container body 3 and an burn-out cylindrical tube 2 and having hollow aperture parts at the center of both end surfaces, the burn-out cylindrical tube 2 extended from the hollow aperture parts to constitute the hollow inner part of the container is provided coaxially with the center axis of container both end surfaces and the burn-out caps 2 and the burn-out cylindrical tube 2 are integrally connected from hollow opening parts of the burn-out caps 2.

Description

  The present invention relates to a burnout container used for storing explosives such as a propellant and an igniter for launching a flying object.

  In general, explosives such as propellants and igniting agents are housed in a burnout container, and loaded together with a flying object inside a cannon such as an howitzer or a tank gun. The loaded burnable container is designed to burn out inside the gun after the projectile is fired due to the combustion gas pressure associated with the explosive combustion of the propellant or igniter. The burnout container is required to have both toughness that does not break during handling, such as being loaded into a gun, and burnout that generates as little residue as possible in the gun.

The following patent documents 1 to 4 disclose general-purpose examples of a system for launching a flying object using a burnable container. The burnout container used in these is composed of three elements: a burnout cap, a burnout cylindrical tube, and a burnout container main body. As a container by combining the burnout members and adhering the laminated part and the joining part. The function of.
Moreover, the flying object can be made to fly for a desired distance by connecting the burnout container in which explosives are accommodated by one or more and burning them. However, if the combustion pressure inside the cannon cannot be maintained high, such as when used alone or when used in a low temperature environment, the burnout of the container will be reduced, and the laminated part or joint bonded to the two layers will burn in the gun. May remain as a residue.
Therefore, it is desired to develop a container having a more excellent burnout structure, which is configured with a simple structure having few laminated parts and joints while maintaining toughness.

  Patent Document 5 below discloses an example of a burnout container that increases the strength by corrugating the outer peripheral surface of the container and enhances the burnout. However, there is no mention of a measure for improving the burn-out property of the two-layer laminated part or the joint part and the improvement effect.

JP-T 61-502207 Japanese Patent Laid-Open No. 5-118793 JP 7-218195 A JP 2005-265352 A JP 2005-140458 A

  The problem to be solved by the present invention is to provide a novel burnout container that has the same strength as a conventional burnout container, and is superior in burnout performance to a conventional burnout container with a simple and simplified configuration. That is.

In order to solve the above-mentioned problems, the present inventors diligently studied the structure of the burnout container, and as a result of repeated experiments, the above problem was solved by integrally configuring the burnout cap and the burnout cylindrical tube. It has been discovered that this is possible, and the present invention has been completed.
That is, the present invention is as follows.

  [1] A cylindrical combustible container comprising a combustible container body, a combustible cap that forms a lid of the container body, and a combustible cylindrical tube, and having a hollow opening at the center of both end surfaces, the hollow opening The combustible cylindrical tube extending from the inside of the container and constituting the hollow interior of the container is provided coaxially with the central axis of both ends of the container, and the combustible cap and the combustible cylindrical tube are formed in the hollow of the combustible cap. The columnar burnable container, which is connected to the opening and integrally formed.

  [2] The cylindrical combustible container according to [1], wherein the integrally configured combustible cap and the combustible cylindrical tube have higher combustibility than the combustible container body.

  Since the burnout container of the present invention has a toughness that does not break during handling, and has a simple structure in which a burnout cap and a burnout cylindrical tube are integrally formed, the area of the laminated portion bonded to the two layers is small. Reduced and excellent burnout. Moreover, since it is a simple structure, it can be produced efficiently at low cost. Further, the burnout cap and the burnout cylindrical tube can be made more excellent in burnout by increasing the combustibility of the burnout container body.

It is a perspective view before the assembly of the cylindrical burnout container according to the present invention. It is sectional drawing of the side surface after the assembly of the column-shaped burnout container which concerns on this invention. It is sectional drawing of the side surface after an assembly which shows an example of the burnout container of a prior art.

Hereinafter, the present invention will be described in detail focusing on particularly preferred embodiments.
The combustible container 1 according to the present invention can be used as an ammunition container for heavy weapons such as a grenade, and includes a propellant 6 inside to be used for launching a flying object.
1 and 2 show an example of a cylindrical burnout container 1 according to the present invention. FIG. 3 shows an example of the structure of a conventional burnout container.
A cylindrical burnout container 1 according to the present invention is configured such that a burnout cap 10 serving as a lid of a conventional burnout container and a burnout cylindrical tube 9 serving as a flame propagation path are connected to each other through an opening. A cap 2 with a combustible cylindrical tube (also referred to as a “combustible cap 2 that forms a lid of a container body integrally formed with the combustible cylindrical tube”), and a combustible container body 3 fitted thereto, That is, it is composed of two burnout members (elements).

  If FIG. 2 and FIG. 3 are compared, since the combustible cylindrical tube 9 and the combustible cap 10 in the prior art combustible container are integrally configured, the area of the laminated portion 7 when combined can be reduced. The burnout can be increased. Moreover, in the burnout container of the present invention, the number of parts can be reduced compared to the burnout container 12 of the prior art, which can contribute to productivity.

  As a method of filling the propellant 6, it can be arbitrarily filled depending on the shape of the propellant. For example, when the propellant is granular, the filling port 4 provided in the cap 2 with the cylindrical tube is used. Thus, a required amount of the propellant 6 can be filled in a space defined by fitting the burnable container body 3 and the cap 2 with the burnable cylindrical tube. When filling the rod-shaped propellant 6, a guide is provided at the center of the burnable container body 3, and after filling the rod-shaped propellant 6, the cap with the burnable cylindrical tube can be attached to the container body.

  The burnout container 1 contains combustible fibers and reinforcing fibers as main components, and also contains raw materials such as stabilizers and binders as necessary. Nitrocellulose, cellulose acetate nitrate (CAN), cellulose nitrate carboxymethyl ether (CNC), etc. can be used as the combustible fiber as the main component. For example, when nitrocellulose is used as the combustible fiber, if the amount of nitrogen is too small, the combustibility is lowered. On the other hand, if it is too high, the combustion becomes intense and stable performance cannot be obtained. It is preferable to use the one in the range of 4%.

  Further, as the reinforcing fiber, it is preferable to use a cellulose fiber. For example, one kind of kraft pulp, cellulose acetate (CA), cellulose acetate propionate (CAP), cellulose acetate butyl (CAB), ethyl cellulose, or the like is used. Two or more types can be selected and used.

Any stabilizer may be used as the stabilizer used in the burnout container 1 as long as it prevents the natural decomposition of the nitrate ester. Examples of the stabilizer used include methyldiphenylurea (AK2), ethyl centralite (ECL), diphenylamine (DPA), 2-nitrodiphenylamine (2-NDPA), and the like.
Examples of the binder include styrene butadiene latex, acrylic resin, polyethylene, polystyrene, polyamide, polybutadiene, and polyurethane.

  As a general method for producing a burnable container using the above raw materials, combustible fibers, reinforcing fibers, binders, stabilizers and the like are turbid in water, and the dispersed slurry is suction-molded and dried by heating. Thereafter, a method of producing a burnable container by finishing is mentioned.

  As a method for increasing the combustibility of the cap 2 with the combustible cylindrical tube more than the combustibility of the combustible container body, (1) increasing the weight ratio of combustible fibers contained, and (2) controlling the bulk density. A method is mentioned. When increasing the combustibility of the cap 2 with a combustible cylindrical tube by the weight ratio of the combustible fibers to be contained, setting the combustible fiber content ratio higher than the combustible container body 3 can further enhance the combustibility. This is preferable because it is possible. A preferred combustible fiber / reinforcing fiber weight ratio is in the range of 1.5 to 4.0. If the weight ratio of the combustible fiber / reinforcing fiber is less than 1.5, it is not preferable because the burnout decreases and the residue after combustion increases, and if it exceeds 4.0, it is severe when burned in a gun. When inducing combustion, especially when a plurality of parts are connected and combusted, it is not preferable because it causes generation of abnormal pressure accompanied by vibration combustion. The weight ratio of combustible fiber / reinforcing fiber is more preferably 2.5 to 3.5. Moreover, it is preferable that the weight ratio of the combustible fiber / reinforcing fiber of the burnable container body 3 is 1.0 to 2.0, and more preferably 1.5 to 2.0.

  In the present invention, the combustible fiber / reinforcing fiber weight ratio of the cap 2 with the combustible cylindrical tube is always kept higher than that of the combustible container body 3 within the above-described range, thereby further improving the combustibility. From the viewpoint, it is preferable.

Further, by controlling the bulk density of the burned out of the cylindrical tube with cap 2, if increasing the burn out of the burned out of the cylindrical tube with cap 2, to a bulk density in the range of 500kg ^{/ m 3} ~1200kg ^/ m 3 Is preferred. The bulk density of the burned out of the cylindrical tube with cap 2 can no longer hold the toughness becomes brittle below the 500 kg / m ^3, not only the more than 1200 kg / m ³ and manufacturability lean, preferably to lower the burnout property Absent. A more preferred range of the bulk density of the burned out of the cylindrical tube with the cap 2 is ^{700kg / m 3 ~1000kg / m 3} .

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to them.
(Example 1)
A cap 2 with a combustible cylindrical tube constituting the combustible container 1 was produced by the following method using nitrocellulose as the combustible fiber and kraft pulp as the reinforcing fiber.
After adding nitrocellulose (65 wt%), kraft pulp (19 wt%), binder (15 wt%), stabilizer (1 wt%), and water to the stirrer, the aqueous solution is homogeneously dispersed Stirring was performed to obtain a slurry solution. Dilution water was added to this solution, and the concentration was adjusted so that the concentration of the aqueous solution was 0.5% by weight. At this time, the weight ratio of nitrocellulose / kraft pulp was 3.5. A felting mold with a filter cloth was immersed in this aqueous solution, and vacuum suction was performed from the inside of the mold to immerse it in the aqueous solution while a certain weight of felt was formed on the mold surface. The felt-like material thus obtained was placed on a molding die heated to about 120 ° C., heated and pressurized for about 3 minutes to remove moisture from the felt-like material and dried.

The cap 2 with a burnable cylindrical tube obtained by the above-described manufacturing method had a cap portion diameter of about 150 mm and a tube portion diameter of about 30 mm (thickness of about 2 mm, density of about 900 kg / m ³ ).
A burnable container body 3 was manufactured by the same manufacturing method. The weight ratio of nitrocellulose / kraft pulp in the burnout container body 3 was adjusted to be 2.0, and the diameter of the body was just set to fit into the cap part. The obtained cap 2 with a combustible cylindrical tube and the combustible container main body 3 were fitted together, and the laminate portion 7 and the joint portion 8 were fixed with an adhesive to form the combustible container 1 (see FIG. 2).

A required amount of propellant 6 is filled into the container from the filling port 4 provided in the cap portion of the burnable container 1, and a small amount of the igniter 5 is disposed inside the burnable cylindrical tube 9. A test sample for evaluating the performance of No. 1 was manufactured.
In order to evaluate the toughness of this test sample, a drop strength test was performed according to the method prescribed in NDS Y 7412 (Defense Agency standard). This test assumes an accidental drop during general handling. The test sample is dropped several times from a height of 1.5 m to confirm the state of breakage. As a result of the test, although slight dents or scratches were observed on the container surface, it was confirmed that there was no fatal damage that would cause the contents to be exposed and that the container surface had sufficient toughness.

(Example 2)
The burnout container 1 was manufactured by the same manufacturing method as in Example 1, and the same test sample as in Example 1 was manufactured. In order to evaluate the burnout of this test sample, the sample was actually burned in the test apparatus and the burnout status was confirmed. The test sample was kept warm for 24 hours in a thermostat set at a temperature of 21 ° C. in advance. The test device uses a 155mm short gun that is modeled after a gun (combustion test device with a chamber volume, structure, etc. that simulates an actual gun, and a gun length of about 1/2). The flying object (the flying object mass was about 40 kg) was loaded in front of the combustion chamber. The test sample was then loaded into the combustion chamber without being connected. After closing the closing device attached to the turret, the fire tube was ignited to burn the sample. After completion of combustion, the residue in the combustion chamber was collected and weighed. For the residue, a dry cloth was used, the inside of the combustion chamber was wiped, and the mass difference before and after wiping was defined as the amount of residue. As a result, as shown in Table 1 below, when the residue of Comparative Example 2 below is 100%, the amount of the residue is reduced to about 35%, and it is confirmed that the burnout is improved. It was.

(Example 3)
The burnout container 1 was manufactured by the same manufacturing method as in Example 1, and the same test sample as in Example 1 was manufactured. This test sample was kept warm for 24 hours in a thermostatic chamber set to a temperature of −31 ° C., and the same test as in Example 2 was performed in order to evaluate the burnout in a low temperature environment. As shown in Table 2 below, the residue in the combustion chamber was measured in the same manner. As a result, when the amount of residue in Comparative Example 3 below was 100%, the amount of residue was about 43%.

Example 4
A cap 2 with a burnable cylindrical tube in which the weight ratio of nitrocellulose / kraft pulp was adjusted to 2.5 was obtained by the same production method as in Example 1. This was combined with a container body having a nitrocellulose / kraft pulp weight ratio of 2.0 to make a burnable container 1. This was filled with the same amount of propellant as in Example 1 and used as a test sample, and the same burnout evaluation as in Example 2 was performed. As a result, as shown in Table 1 below, when the amount of residue in Comparative Example 2 below was 100%, the amount of residue was about 45%. In addition, as shown in Table 2 below, as a result of performing the same burnout evaluation as in Example 3 on the same test sample, 57% residue was obtained when the amount of residue in Comparative Example 3 below was 100%. It became the amount.

(Comparative Example 1)
Nitrocellulose (60% by weight), kraft pulp (30% by weight), general-purpose resin (9% by weight), and stabilizer (1% by weight) are suspended in water so that the weight ratio of nitrocellulose / kraft pulp is 2.0. After preparing the adjusted slurry, suction felting, heating and pressure molding are performed in the same manner as in Example 1, and it consists of three elements: a burnout cap 10, a burnout cylindrical tube 9, and a burnout container body 11. A prior art burnable container 12 was obtained (diameter about 150 mm, thickness about 2 mm, density about 900 kg / m ³ ).

(Comparative Example 2)
The burnout container 12 of the prior art obtained in Comparative Example 1 is filled with the same amount of propellant 6 as in Example 1, and the same test as in Example 2 is performed to confirm the burnout, and after combustion, The residue was weighed. The results are shown in Table 1 below.

(Comparative Example 3)
A test similar to Comparative Example 2 was performed, except that the temperature of the sample was -31 ° C. The results are shown in Table 2 below.

  The combustible container of the present invention can contain explosives and the like, and can be suitably used for bullet shooting in a heavy weapon such as a cannonball.

DESCRIPTION OF SYMBOLS 1 Cylindrical burnable container which concerns on this invention 2 The burnable cap which makes the cover of the container main body comprised integrally with the burnable cylindrical tube 3 The burnable container main body 4 Propellant filling port 5 Ignition powder 6 Propellant 7 Lamination | stacking part 8 Junction 9 Prior art burnout cylindrical tube 10 Prior art burnout cap 11 Prior art burnout container body 12 Prior art burnout container

Claims (2)

  A column-shaped burnable container comprising a burnable container body, a burnable cap that forms a lid of the container body, and a burnable cylindrical tube, and having a hollow opening at the center of both end faces, extending from the hollow opening The combustible cylindrical tube constituting the hollow interior of the container is provided coaxially with the central axis of both ends of the container, and the combustible cap and the combustible cylindrical tube are formed from the hollow opening of the combustible cap. The columnar burnout container characterized by being connected and integrated.   The cylindrical combustible container according to claim 1, wherein the integrally configured combustible cap and the combustible cylindrical tube have higher combustibility than the combustible container body.

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