The actual load capacity of a lift table depends largely on the position and distribution of the load on the platform.
In this article, you will learn from a practical example how the effective load capacity of a 1,000 kg lift table changes depending on the load distribution.
Why does the load distribution affect the load capacity of a lift table?
The cause lies in the interaction of force and lever arm. Depending on the position and distribution of the load on the platform, the mechanical stress on the scissor struts changes.
To illustrate this, let us consider two very simplified examples.
Example 1: Load centered between fixed and movable bearings
If the load is positioned in the center of the platform between the fixed and movable bearings, the load is distributed evenly. This ensures that the scissor mechanism is optimally loaded so that the lift table can safely carry its maximum permissible load under these conditions.
Example 2: Load at the platform edge
If you compare this sketch with the previous example, it becomes clear that the load here is not evenly distributed on the fixed and floating bearing side. Instead, the floating bearing must absorb significantly higher forces, which means that the load on this side is about twice as high despite the identical load.
This example shows that the specified load capacity of a scissor lift table does not apply equally to all load cases. The position of the load has a significant influence on the actual load on the individual components.
Load capacity of lift tables: These are the requirements set out in the EN 1570-1 standard
EN 1570-1 defines safety requirements for lift tables and sets out binding criteria for load capacity. It ensures that a lift table works reliably even with different load distributions. The following minimum requirements apply:
1. Full-surface loading: The lift table must safely support the rated load capacity when the load is evenly distributed over the entire platform.
2. Half the platform length is loaded: If the load is only on half the platform length, the lift table must be able to safely lift at least 50% of the nominal load capacity. In this example, that would be 500 kg.
3. Half the platform width loaded: If the load is only on half the platform width, the lift table must be able to safely carry a third of the nominal load capacity – in this example, about 330 kg.
If a load of 1,000 kg is to be applied only to half of the platform length or width, a lift table with 2,000 kg or 3,000 kg nominal load capacity is required – in accordance with the above requirements.
But what if the load distributions defined in EN 1570-1 do not exactly match the planned application? In this case, it is advisable to coordinate the force introduction directly with the lift table manufacturer.
If the manufacturer has its own design department, it can develop a customized solution and optimally adapt the lift table to the specific operating conditions.
Find the right lift table for your application
Discover our range of standard lift tables with different load capacities. Not sure which scissor lift table is best for your application? We will be happy to advise you!
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