带滚珠调节的面-面接触形式负荷传感器球头副

为降低传统负荷传感器球头的接触应力水平,提高传感器测量的准确度和长期可靠性,设计了一种带滚珠调节的面-面接触形式的负荷传感器球头副结构,同时通过对比实验进行了验证,实验结果显示采用该结构的球头副,一只20MN柱式力传感器可在倾斜0.2°的状态下,测量得到重复性小于0.005%、方位误差小于0.04%。研究表明,该带滚珠调节的面-面接触形式负荷传感器球头副相对未带滚珠调节的面-面接触形式传感器球头副,球头相对球碗转动时摩擦阻力更小,不仅能实现水平自调节,而且还能灵活调整由负荷传感器上、下承压面不平行带来的角度偏差,使传感器在不同测量方位测得的载荷输出值更一致,方位误差更小。此外,由于采用了面-面接触形式,该结构球头副接触应力较小,具有较大的承载能力,保证在大载荷作用下具有足够的强度。

Load Cell Loading Pad of Surface to Surface Contact Form with Bearing Ball

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.