2. 2. 2 Adopt new packaging structure design
In recent years, the U.S. military has accepted and identified a large number of new packaging structures. The U.S. Army Ordnance Research and Development and Engineering Center has tested the metal barrel structure of 120mm tank bombs, the packaging of 7.62mm ammunition metal boxes, and the packaging of 7.62mm gun barrels of WC750 propellant.
120mm831 and M831E2 practice fire trace tank bombs, generally use PA116 metal tube packaging. The specific approach is to add a foamed polyethylene support at the interface between the projectile and the flammable cartridge to increase the resistance to damage. The improved packaging structure greatly improves the packaging protection performance. A new packaging system was used for 120mm and 25mm ammunition [5O6].
Currently, the new packaging for the 120mm M1A1 tank ammunition series and the new packaging for the 25mm ammunition series for the Bradley infantry fighting vehicle system are the two best packages. The new packaging for 120mm tank ammunition is a system that fixes the steel cylinder packaging container on a steel pallet. The advantage of this system is that it is possible to remove the ammunition in the next step without destroying the tray packaging tape, and additionally add 10 rounds of ammunition to each pallet; this pallet structure allows two rows of trays facing outwards to be fixed on the high mobility On tactical trucks, the load capacity of each vehicle is increased from 72kg to 108kg, which allows two tanks to be replenished with ammunition at the same time, reducing the time for feeding bombs, and using an old-fashioned wooden box package to fully supplement an M1A1 tank. It took 33 minutes to feed the shells, and it took only 14 minutes for the two tanks to be filled with new trays. As a result of packaging improvements, a total life-cycle cost of over $17 million was saved .
Germany developed a new plastic tube for packaging cannonballs. The plastic packaging tube consists of a cylinder body, a bottom of a cylinder, a cylinder lid, a liner lined paper cylinder and a sealing ring made of elastic material. The feature is that the internal surface of the cylinder body is longitudinally distributed three times apart 120 The angle-shaped arc-shaped guide strip makes the paper tube easy to center and push into the cylinder; the paper tube is spirally wound from multi-layer paperboard, and is adhered to the plastic cylinder body, and has the function of absorbing the moisture in the cylinder to improve the packaging. The protection function .
The new packaging for the 25mm ammunition series is a rectangular steel container. The new packaging container solves the problem of ammunition waterproofing while reducing costs and reducing the amount of flammable materials contained in the car; the ammunition can also be removed faster in order to give All turret weapons and equipment replenishes ammunition. The two packaging structures improve the ammunition protection capabilities while also improving the combat capabilities of the Army's main weapon systems.
2. 2. 3 Pallet Containerization of Ammunition Packaging
Palletized containerized packaging has many features such as large loading capacity, convenient management and use, and saving transportation costs. The U.S. military considers the trays and packaging boxes to be unit packages of ammunition. In the process of storage and transportation, pallet operations are the smallest unit of operation. Whether they are small-volume fuzes or large-caliber ammunition, they have all achieved pallet assembly. The U.S. military ammunition trays have become the main method for the delivery of ammunition from the factory to each ammunition supply station. The unit combination trays are used directly as force ammunition and transport storage containers. In order to shorten the time for picking up shots and improve the efficiency of the entire system, the US military has improved the pallet assembly (for example, 105 tanks of guns and ammunition), and the method of directly retrieving rounds of pallets has become the new requirement of the US military ammunition packaging design. The United States is the first country to make large palletized wooden boxes. The Pica Tinny Arsenal pioneered the manufacture of a large pallet wooden box capable of carrying 86 rounds of 62mm rockets, instead of 45 rounds with 3 bullets, and a similar size of 3 ordinary wooden boxes; The large shells of the shells replaced 21 ordinary wooden boxes with the same number of shells. The U.S. Army developed a large-sized tray type wire bundle wooden box, which is used as an outer box and can hold 38 rounds of 105mm490 anti-tank coaches that are packaged in asphalt paper drums. The total weight is 1103.4kg and the volume is 1.328m3. Compared with the old packaging, the package weight was reduced by 14.1%, the volume was reduced by 37.5%, and the packaging material was saved by 59%. The container can also be used for packaging of other tank bombs. Another new invention of the US military's 105mm tank bomb package is to fix 30 or 35 metal packages on a metal tray to form a reusable unit package. A unit package allows one tank to be loaded and used. Once loaded, only the metal end cap needs to be opened to remove the projectile, and the bomb can be automatically fed into the tank. This is very convenient to use. Due to the advantages of safe and rapid container transportation, high protection performance, simplified packaging, and reduced packaging costs, the US military has gradually increased the number of containers used, and the scope of use has continued to expand. Now, new types of containers that can be opened from the top and side are being developed and purchased. The U.S. military has also set up an implementation team for container transportation of ammunition and missiles. The mission of the U.S. military is to improve cushions and fastening methods, reduce the cost of containers, and strive to achieve 100% use of containers for ammunition. At present, 80% of the ammunition shipped by the U.S. military to Europe has been shipped in bomb containers. Practical experience shows that the structure of small size, which can be opened from the top and side to facilitate loading and unloading is more practical because it can overcome the disadvantages of inconvenient loading and unloading of bomb containers.
2.2.4 Dry packs are developing rapidly
In packaging, temperature and humidity are the major causes of corrosion, degradation, deterioration, destruction, and loss of use of military products. All kinds of ammunition and equipment need a certain humidity environment when they are packaged and stored. The ammunition relative humidity limits range from 45% to 55%. Based on the above data, the optimal relative humidity for ammunition and device packaging and storage is about 45%. Practice has proved that dry air packaging and storage are both economical and effective methods. This has been used by the military in various countries, from the storage of large-scale equipment such as army tanks and artillery to small arms such as ammunition. It has become the best reliable method for the Army's long-term or short-term storage of ammunition and equipment, and its research and application have further development trends.
(to be continued)
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