When the caster moves or wants to control its direction of travel, the force must be transmitted to the caster through the object and overcome a certain resistance to achieve. Therefore, the casters must undergo strict testing of rolling resistance and rotation resistance before leaving the factory, and only those casters that have passed the test are allowed to enter the market. Today, I will introduce to you how the rolling resistance and rotation resistance test of casters are carried out.
For the test of rolling resistance, the standard is to install three casters on a fixed three-arm base. According to different test levels, a test load of 300/600/900N (including the mass of the base) is applied to the base. A horizontal traction force makes the casters on the test platform travel at a speed of 50mm/S (allowable deviation ±5%), and keep it for 10S. Due to the large friction force and an acceleration at the beginning of the caster rolling, the horizontal traction force is measured after the test is carried out for 5S, and its size does not exceed 15% of the test load to be qualified.
Rotational resistance testing is performed by mounting one or more casters on a linear or circular motion tester so that it is oriented 90° to the direction of travel. According to different test levels, a test load of 100/200/300N is applied to each caster. Apply a horizontal traction force to make the casters on the test platform travel at a speed of 50mm/S (allowable deviation ±5%), and rotate within 2S. Record the maximum horizontal traction force that makes the caster rotate, and its size does not exceed 20% of the test load to be qualified.
Regular manufacturers must perform the above two resistance tests on casters before they leave the factory, while some bad manufacturers will skip or shorten this step in order to save production time, causing potential safety hazards. Therefore, you must identify the brand when purchasing caster products, and choose caster products with high reputation and good reputation.
