The crossbeam of the shelf is the core component that bears the goods. Under normal circumstances, it needs to support weights of several hundred kilograms or even tens of tons for a long time. However, many warehouses have found after using it for several years that the crossbeam will slightly sag. When pallets are placed on it, it always feels as if the goods are "sinking down".
Even if the sagging amplitude is only 2-3 millimeters, it will still be terrifying in the long run. Especially for high-position shelves, if the crossbeam deforms, it not only affects the efficiency of storage and retrieval, but also poses safety hazards.
The main reasons for the sagging are two: one is the unreasonable section design, with insufficient bending resistance; the other is the deviation in the welding of the ends, resulting in uneven force distribution. Customers often hear data such as "theoretical load capacity of 2 tons" when purchasing, but in reality, due to improper material performance and process control, even if the crossbeam can bear the weight for a short period, it may not be able to ensure no deformation in the long term.
Some experienced warehouse managers will specifically ask when purchasing: "Have your crossbeams undergone long-term load testing?" Compared to the parameters on paper, such verification can better explain the situation. After all, the lifespan of the storage shelf is not determined by the thickest steel plate, but by these "invisible details".