Through type rack is also called the shelves or in healthcare, the splice packaged structure, column for prefabricated structure, bracket for special one-time stamping cross bracket, high strength, good rigidity, beautiful shape, the bracket beam for rolling super bracket beam, top piece for the bolt connection between beam and column type or plug connection structure. This system has a dense shelf layout and high space utilization rate, which is almost twice as high as the pallet shelf. The selection of such a system, must first container unitization work, determine the specifications of the tray, weight and lift, and then determine unit shelves span, depth, layer spacing, according to the roof of the effective height of the height of the shelf. By regional wall shelves total depth of the best control within the six tray depth, middle area can both in and out of the shelf area total depth of the best control within the 12 pallets depth, in order to improve the efficiency and reliability of the forklift truck access, this kind of rack system, forklift for continuous "exalted skyer" practices, forklift shake easily and hit the shelves, so this kind of storage system stability relatively narrowly, shelf is unfavorable and exorbitant, usually should be controlled within 10 m, and in order to strengthen the stability of the entire shelf system, in addition to the specification, selection are larger, must be added horizontal and vertical solid device. The goods in a single pallet should not be too large or too heavy. Generally, the weight should be controlled within 1500kg, and the pallet span should not be more than 1.5m. This system shelves arranged densely populated with very high space utilization, is almost twice the normal pallet racking, usually with the types of goods suitable for storing few varieties and large displacement, the goods can be from the same (out) after advanced side, also can from one side of the opposite side (first in first out), more than for dairy products, beverages, food industry and cold chain industry can be divided into normal temperature library and freezer. Usually equipped with a forklift for the forward - moving battery forklift or balance heavy battery forklift.