Portable Weighing Truck Scales - The Actual Stage and Further Prospects in Taiwan

摘要

Portable wheel load weighers are small hand carried platform scales designed to measure the wheel weights of various types of vehicles. A lot of truck scales are available, using different measuring principles. Their principal problem is the minimum number of scale intervals, being preferable to have more than 1000 in order to avoid the user contests. Having in view the price/performance ratio, the most popular weighing scales are those with strain gauges. Going to a superior stage, from suspecting to detecting weight-limit violations, CMS/ITRI has in view a proper solution, a modern and economic one: to design a static-mode portable weighing truck scale with an error under 0.1%, as for precision force transducers category. Following the patents in the field of weighing technologies, there are some attempts to improve the sensitivity: cutting slots or adding prolongations as cantilever beams at the rectangular plate corners. For such complicated mechanical structures analytical formulas do not exist, so numerical investigation using the finite element analysis is more than necessary. Our new model of low profile and high sensitivity wheel weigher is in patentation in Taiwan and U.S.A.