双深度货架

 双深度货架在一个深度方向能存储两个托盘，如果是双面取货货架，则可以存储四个托盘深度。双深度货架降低了通道占用的空间，增加了存储密度，但同时降低了托盘的拣选性，同时遵循先进后出的原则，50%的即时存取率使得该系统具有合理的存储流通性，同时也很好地利用了空间。这个系统最适合于每种存储物品种类和托盘数都多于几个托盘的情况。该系统必须使用能伸入货架的特殊叉车。由于受到货物重量的限制，叉车提升高度一般最多可达到9米左右。如果需要，系统的上层可以配导轨以帮助叉车司机存取托盘，同时又有助于减少叉车操作人员的失误及由此带来的破损。
Double deep racking can store two pallets in one depth direction. In the case of double sided racking, four pallets can be stored in one depth direction. Double deep racking reduces the space occupation of channel and increases the storage density, but decreases the selectivity of pallets. At the same time, First In Last Out (FILO) principle is followed, and the immediate storage rate of 50% provides such system with reasonable circulation performance and effective utilization of space. This system is particularly suitable for the case in which each kind of goods is stored in many pallets. This system requires special forklift that can extend into the racking. Due to the restriction of goods weight, generally the maximum lifting height of forklift is 9m or so. If necessary, guide rails may be installed on the top layer of the system so that the forklift driver can deposit or take out pallets conveniently and miss-operation of operators and associated damages can be reduced.

优点：
由于巷道数的减少与标准型托盘货架系统相比存储密度提高了50%的即时存取率及合格的周转率。
托盘位使用率通常高达90%。
底层的托盘不直接存放与地面，更加安全和易于操作。
双深度搬运工具（叉车）可用于其他任务。
Advantages:
Due to reduced number of aisles, this system improves the immediate storage rate and eligible turnover rate by 50% with respect to storage density compared with standard pallet racking.
Generally the pallet location use rate is up to 90%.
The bottom pallets are not directly placed on floor, leading to higher safety and easier operation.
Double deep handling vehicles (forklift) can be used for other tasks.