扭矩标准机新型杠杆支承系统设计

扭矩标准机是扭矩量值传递的标准仪器,主要用来校准高精度的扭矩传感器,其复现量值的不确定度是应用效果的重要保证。目前,国内外扭矩标准机的力臂杠杆部位大多采用刀口刀承支承方式或小孔节流原理整体式气体轴承支承方式,通过分析这两种支承结构的局限性,改进设计了一种新型杠杆支承系统,采用组合式静压气体轴承支承杠杆,有效控制摩擦力矩的同时还降低了实现难度和故障率,进而实现了整机性能的提升。同时,本组合结构还可将力臂杠杆改进为单梁双臂对称式框架结构,从而在降低杠杆加工装配难度的基础上使力臂杠杆的测量准确度得到有效保证。本文基于Fluent软件对多孔质静压气浮轴承进行流体仿真,研究供气压力、多孔质材料渗透率、轴承体厚度对其静态性能的影响,对轴承的选型提供理论依据和数据支持。

Design of New Lever Support System for Torque Standard Machine

Torque standard machine is a standard instrument for the transmission of torque value, which is mainly used to calibrate high precision torque sensors. The uncertainty of the repeatability value is an important guarantee for the application effect. At present, most of the lever parts of the torque standard machines in China and abroad adopt the knife-edge and knife-bearing support method or the integral air-bearing support based on small hole throttling principle. By analyzing the limitations of the two support structures, a new type of lever support is designed and optimized. The system adopts a combined static pressure air-bearing to support the lever, which effectively controls the friction torque while reducing the difficulty of realization and the failure rate, thereby realizing the improvement of the performance of the whole machine. At the same time, the combined structure can also improve the moment arm-lever into a single-beam double-arm symmetrical frame structure, so that the measurement accuracy of the moment arm-lever can be effectively guaranteed on the basis of reducing the difficulty of lever processing and assembly. Based on the Fluent software, this paper conducts fluid simulation of porous static pressure air bearings, studies the influence of air supply pressure, porous material permeability, and thickness of the bearing body on their static performance, and provides theoretical basis and data support for the selection of bearings.