70kN载荷应变天平校准系统研制进展

研制了70kN量级的应变天平校准系统,以满足2m量级高速风洞测力试验天平的静态校准需求。70kN载荷应变天平校准系统基于传统的单元校准方法,采用四自由度复位式体轴系自动校准方案,加载力源为标准砝码,采用砝码独立控制技术的自动加载装置实现天平校准载荷的自动加载。砝码产生的重力通过双十字铰链施力定位装置和刚性加载头准确地传递到天平上,无间隙复位传动机构可以保证天平的精确复位。建成后的校准系统可满足20~70kN量程范围的杆式天平和环式天平等不同类型天平的校准需求。

Development of the 70kN strain gauge balance calibration system

To meet the static calibration requirement of the balances used in force tests of 2 meter scale high speed wind tunnel,a 70kN strain gauge balance calibration system is developed. Based on the traditional OFAT method,the scheme for four degree of freedom,balance body axis system replacement and automatic calibration is adopted.Standard weights are applied to provide accurate calibration loads by using automatic loading weights device,which controls weights independently.Through the double cross hinge force acting point positioning device and the but-terfly shape loadadapter,balance can be loaded exactly.Gapless replacement transmission mechanism ensures precise replacement of the balance.The final calibration system can meet the calibration requirements of different types of balances such as sting and ring ranging from 20kN to 70kN loading.