Put aside plate shelves are usually artificial access goods, packaged structure, uniform layer spacing adjustable pitch (P = 25,50,75, etc.), also often for bulk goods or not heavy already packaged goods (for artificial access), shelf height is usually below 2.5 m, or artificial reach (e.g., supplemented by truck can be set up at about 3 m). Unit shelves span (i.e. length) shoulds not be too long, the unit shelf depth (the width) shoulds not be too deep, according to the unit of each layer of the load can be divided into light, medium and heavy shelf board type shelf, layer board is mainly for the steel layer board, wooden floor board two kinds. To reduce costs and to be more environmentally friendly, components can be made entirely or partially of galvanized steel. (1) light shelf-type shelf: the weight of each layer of unit shelf is not more than 200kg, and the total load is generally not more than 2000kg. Unit shelves span usually no larger than 2 m, the depth is not greater than 1 m (0.6 m), height, generally within 3 m, common for Angle steel vertical arm shelf structure, splicing and rivet and other types, installation convenient disassembly, light, beautiful appearance, is mainly suitable for storing light and small goods. Capital investment is small, widely used in electronics, light industry, culture and education industries. Common specifications: W=900/1200/1500/1800, D=300/450/600. (2) medium shelf-type shelves: the weight of each layer of unit shelves is generally between 200 and 800 kg, and the total load is generally not more than 5000kg. The unit shelf span is usually no more than 2.6m, the depth is no more than 1.2m, and the height is generally within 3m. The laminates are usually steel laminates in the form of shear bending and rolling, and are made of ordinary cold-rolled and galvanized steel. So are other components. If the unit shelf span is less than 2m and the layer load is less than 500kg, it is usually suitable to choose the medium shelf without beam. If the unit shelf span is more than 2m, the beam type medium shelf can only be selected. No beam medium than medium with a beam shelves, layer spacing adjustable scope is bigger, stronger, beautiful, coordination with the environment better, more suitable for some high cleanliness requirements of warehouse; Beam type medium shelf-type shelves are more industrialized and are more suitable for storing metal structure products. Medium shelf shelves are widely used in all walks of life. The beam - free rack columns are 55*55 in specifications and adjustable spacing is 50. The beam shelf column is 55*47 and the adjustable distance is 50. Common span W=900/1200/1500/1800/2000; Commonly used depth D = 220/330/450/600/720/900/1200. (3) heavy shelf panel shelf: put heavy plate is in heavy beam shelves, built on the basis of the general is on the beam with the upper plate, unit shelves on each floor load is usually between 500 ~ 1500 kg, unit shelves span generally within 3 m, within 1.2 m in depth, height in artificial operational scope; And is often combined with a heavy duty pallet racking, phase coexist, the following several layers to put aside plate, artificial access homework, height above 2 m part for pallet racking, usually use forklift access operations. It is mainly used in some cases where the storage and storage are required as well as the petty cash withdrawal. It is more common in large warehouse supermarkets and logistics centers.