How do I determine if supermarket shelf casters meet load requirements?

To determine if supermarket shelf casters meet load requirements, you need to calculate the load, verify parameters, and consider safety margins. The specific steps are as follows:

1. Calculate the total load and wheel requirements
First, calculate the total weight of the shelf, including the shelf weight and the maximum cargo weight. Based on the number of shelf casters (usually four), calculate the required load capacity per wheel:
Single wheel load capacity = total load ÷ number of casters × safety factor

Recommended safety factors: 1.2 for light-duty shelves (≤300kg), 1.3-1.4 for medium-duty shelves (300-800kg), and 1.5 for heavy-duty shelves (≥800kg). For example, a shelf with a total weight of 680kg and four casters, with a safety factor of 1.4, requires a minimum load capacity of 238kg per wheel.

2. Verify caster specifications and materials.
Ensure the caster's stated load capacity per wheel (check the product label) is not less than the calculated value. Note that some casters indicate a total load capacity, which requires conversion. Also verify the material:

Bracket: Choose cold-rolled steel or alloy (thickness ≥ 2.5mm) for heavy loads; high-quality plastic for light loads.

Wheel: For loads ≥ 150kg/wheel, reinforced PU or nylon wheels are recommended.

Bearings: Ball or needle bearings are preferred to ensure load capacity and flexibility.

3. Consider actual usage conditions.
Allow a 10%-20% margin to account for uneven load distribution (uneven cargo distribution). For frequent movement or rough surfaces, further increase the safety factor. After installation, perform a full-load test to check for any noticeable sinking, deformation, or unusual noise.

Summary: Avoid choosing casters without clear load-bearing markings or made of weak materials. Accurate calculations, parameter verification, and actual testing can ensure that the caster's load capacity meets safety requirements.