1. School of mechanical engineering and automation, Fuzhou University, Fuzhou, Fujian 350108, China
2. Department of intelligent measurement, Fujian Institute of Metrology, Fuzhou, Fujian 350003, China
Abstract：To eliminate the contact stress of the traditional loading pad of load cell and enhance the accuracy and longtime stability of the load cell, a loading pad of surface to surface contact form with bearing ball was designed. The contrast experiment was carried out to verify its performance. The testing results of a 20MN force transducer with the loading pad showed that the repeatability error and position error was less than 0.005% and 0.04%, respectively. The loading pad of surface to surface contact form with bearing ball was confirmed with better specification compared with the loading pad of surface to surface contact form without bearing ball. With smaller frictional resistance, the ball could rotate itself around the cup to compensate the angular misalignment between the upper and bottom contact platen of the load cell. It would uniform the outputs of the load cell loaded in different positions and get better position error. Besides that, the contact stress of this style loading pad was much low, which made the loading pad strong enough to bear large load.
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2020, Vol. 41 
