FI90798C - Mine, especially a sea mine - Google Patents

Abstract

The invention relates to a mine, particularly an underwater mine, comprising a container (1) of reinforced plastic for explosive. In the invention, in order to protect the explosive filler against various environmental effects and to improve safety during storage, the outer surface of the container (1) of reinforced plastic is covered by a flexible rubber or elastomer layer (2) having a density of about 0.7 to 2.0 g/cm<3>. <IMAGE>

Description

i 90798

The present invention relates to a mine, in particular a sea mine, handling a silicon of reinforced plastic in an explosive manner.

Sea mines such as those described above are most typically made of aluminum in the case of råhdesåilionså. Although aluminum is not susceptible to corrosion, it nevertheless has a number of problematic features when used in an explosive container. Aluminum is electrically conductive and thus detectable on the basis of this property. Furthermore, the thermal conductivity of aluminum is very good, so that the explosive inside the silo made of it heats up very quickly to the surrounding temperature. For example, in the event of a fire, there may be a risk or explosion. Furthermore, an aluminum tank has an explosion-mediating effect, since such a mine, when exploded, releases fragments into the environment which are capable of penetrating the corresponding mines, also causing them to explode. Furthermore, the coefficient of thermal expansion of aluminum is somewhat, perhaps about twice, higher than that of typical explosives. Thus, a gap tends to form between the aluminum tank and the explosive, on the basis of which the mine may be able to be detected.

In particular, due to the above-mentioned detrimental properties of aluminum, efforts have been made to provide marine mines with an explosive container made of reinforced plastic. However, the problem then becomes to make the reinforcing plastic sufficiently durable without having to unreasonably increase its material strength. Conventional sea mines are lowered by dropping on the seabed, which, when hit by the seabed, may result in shocks that can cause damage to the explosive tank.

It is an object of the present invention to provide a marine mine comprising an explosive container 2 of reinforced plastic, which, however, does not have the above-mentioned problems. This is achieved by means of a marine mine according to the invention, which is characterized in that the reinforced plastic container is provided with a flexible rubber or elastomer layer with a density of about 0.7 to 2.0 g / cm 3 with respect to its outer surface facing the environment 5.

Most commonly, the mine mine boundary repository is generally cylindrical and the center of gravity of the mine is adjusted to the center of the mii-10 nan. In this case, when the mine falls freely in the water, it moves back and forth in its longitudinal direction in a manner resembling a falling leaf. As a result, it is preferred that the portion of the elastomeric layer covering the bottom of the silo be several times, preferably about ten times, stronger than the portion of the elastomeric layer covering the sides of the silo. In this way, the impact-protecting effect of the elastomer layer is greatest in those areas from which it is most likely to first rush to the seabed, i.e. in the area of the bottom of the cylindrical explosive container.

In the following, the sea mine according to the invention and its advantages will be described in more detail below with reference to the accompanying drawing, the figure of which is seen from the side and partly in section from the explosive container of the sea mine according to the invention.

The figure shows an explosive container contained in a mine according to the invention, which is intended in particular for use as a marine mine, consisting of a tank 1 of reinforced plastic on the one hand and an elastomeric layer 2 surrounding the mine. parts are not shown in the figure for clarity. The reinforced plastic container 1 forming the inner part of the explosive container comprises a generally cylindrical central part 6, one end of which is connected to the base part 7 and the other end 35 to the mouth part 5. The reinforced plastic container 1 can be made either

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90798 3 in one piece or, most conventionally and more easily, it can be made of said three parts 5, 6 and 7, of which the base part 7 and the mouth part 5 are joined by gluing to the cylindrical body part 6. For this purpose, the connecting surfaces between the parts 5 As the material of the reinforced plastic container, conventional fiber-reinforced disposable plastics can be used, i.e. reinforced plastics, which thus comprise glass, carbon or other similar fiber and plastic, which may be epoxy plastic, vinyl ester plastic or polyester plastic. The reinforcing plastic used in the container 1 may, in addition to the above-mentioned, contain conventionally known additives in order to improve its flexibility.

The second part of the barrier container shown in the figure is formed by an elastomer layer 2 formed in the area of the outwardly facing surface of the container 1. This elastomer layer 2 can preferably be formed by casting it on the container 1 in a closed mold in which the container 1 is centered. In this way, the desired properties of the elastomer are also obtained. In order for the elastomer to form sufficiently lu and on the other hand sufficiently elastic and in one way rubbery, its density should be between 0.7 and 2 g / cm, most preferably about 1 g / cm. The elastomer layer 2 thus contains an elastomer and an additive by means of which it is made to foam to the above-mentioned density inside the closed mold. In addition, a colorant can be mixed into it, whereby the elastomer becomes through-dyed and can be given a desired color tone. The most important function of the elastomer layer 2 is to protect the reinforced-30 plastic container 1 from external shocks. By imparting the above-mentioned properties to this elastomer layer 2, very good impact resistance is obtained with a relatively low layer thickness. Since, as mentioned above, when the mine is dropped into the sea, the impacts are mainly on the mine head, the elastomeric layer in the area 7 of the bottom 7 of the silo 1 is clearly made stronger than the rest of the area of the elastomeric layer. Thus, the strength of the elastomer layer 4 on the cylindrical part of the silo 1 is perhaps only 1/10 of the thickness of the elastomer layer 3 at the bottom 7 of the silo on the center line of the silo-5. In this way, the bottom of the container, and in particular its corners, is very impact-resistant. As can be seen from the figure, the bottom 7 and the mouth of the container 1 are rounded in a known manner from conventional containers to increase its strength.

As further shown in the figure, the mouth part 5 of the container 1 is provided with various projections and notches for attaching the limiter and the igniter. However, these components of the container 1 are not more important for the invention, but their shape and construction may vary as necessary.

The sea mine according to the invention has several excellent properties compared in particular to an aluminum-clad sea mine. First, its material is neither electrically conductive nor magnetic, so it cannot be detected by these 20 properties. However, the material can be made electrically conductive if necessary. When it explodes, the mine also does not release Sirpa fluids into the environment, which could infiltrate mines in its environment, for example in the same storage space. Thus, the explosion of a mine in a warehouse of one to 25 is unlikely to cause an explosion of other mines in the same warehouse. The thermal expansion coefficient of the reinforced plastic container is the same as the thermal expansion coefficient of several explosives. Thus, no 30 gaps are sought between the explosive and the silo. The mine according to the invention is also very durable in terms of environmental conditions, because the elastomer layer covering it is closed-cell and hermetic. On the other hand, its thermal conductivity is only a fraction of the thermal conductivity of aluminum. Thus, even when exposed to fire, the mine according to the invention only explodes after a very long period of time.

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90798 5 tua. As mentioned above, the material of the explosive container can also be so-called dyed, so that external knocks cannot change its color. The mine according to the invention also has a simpler structure than a mine with an aluminum shell, in which several structural parts are required for joining different parts. The advantage of the reinforced plastic explosive container is also the free formability of the container. Further, the reinforced plastic container surrounding the barrier can be given the desired elastic properties by modifying its plastic material.

The mine according to the invention and its advantages have been described above by means of only one exemplary embodiment, and it is to be understood that the structural solution according to the invention can be applied to nearly arbitrary explosive containers without departing from the scope of the appended claims. Thus, different surface shapes can be imparted to the outer surface of the explosive container or the elastomeric layer forming the surface can be reinforced as desired at different points to provide different properties, such as impact resistance properties or different appearance.

Claims (2)

A mine, in particular a marine mine, comprising an exploded view of a reinforced plastic silo (1), characterized in that the reinforced plastic container (1) is provided with a flexible rubber or elastomeric layer on its outer outer surface. having a density of about 0.7 to 2.0 g / cm 3. A mine according to claim 1, wherein the ridge-10 is generally cylindrical, characterized in that the part (3) of the elastomer layer covering the bottom (7) of the silo is several times thicker than the part of the elastomer layer covering the sides (6) of the silo. (4). II 90798