Shelf-type shelves are usually manual access, assembled structure, layer spacing is evenly adjustable, goods are often loose parts or not very heavy packaged items for manual access, shelf height is usually below 2.5m, otherwise It is difficult to reach by hand, such as a climber, it can be set at about 3m. The shelf length of the unit shelf should not be too long, and the depth of the unit shelf should not be too deep. According to the load capacity of each layer of the unit shelf, it can be divided into light, medium and heavy shelf shelves. The laminates mainly include steel decking and wood decking two kinds.