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针对四轮定位仪主销内倾角在检定过程中存在误差的问题,研制了基于多自由度空间正切机构的新型全自动四轮定位仪检定装置。该检定装置的主销后倾与主销内倾的模拟调整运动可分步独立完成,避免了主销工作运动时因干涉产生的角度误差。在此装置基础上基于空间几何分析,建立了四轮定位仪主销内倾检定数学模型。通过对模型几何关系的分析推导,得到了影响主销内倾角检定精度的主要因素。装置按照国家标准进行了主销后倾角和主销内倾角示值精度检测,结果符合计量规范要求。该设计为后续的四轮定位仪检定装置的设计提供了一定的借鉴。
Aiming at the problem that the main pin inclination angle of the four-wheel aligner locates in the verification process, a new automatic four-wheel aligner calibration device based on the multi-DOF space tangent mechanism was developed. The verification device kingpin backward and the main pin inward tilt analog adjustment exercise can be completed step by step independently, to avoid the main pin work movement due to interference angle error. Based on this device, based on the geometric analysis of space, a four-wheel positioner king pin inclination mathematical model was established. Through the analysis and deduction of the geometric relation of the model, the main factors influencing the accuracy of the pin inclination detection are obtained. Device in accordance with national standards for the main pin angle and kingpin inclination indication accuracy testing, the results meet the measurement specifications. The design provides a certain reference for the design of the subsequent four-wheel alignment device.