Automatic positioning contact control automobile panel critical dimension measuring system

The invention discloses an automatic positioning contact control automobile panel critical dimension measurement system. The system comprises a base plate, a detection tool body, a control detection module, an upper tool and a single-chip microcomputer. The testing fixture body is fixed on the upper surface of the base plate, the control detection module is integrated in the testing fixture body, a plurality of first sensors are arranged on the outer side wall of the testing fixture body, and the first sensors are electrically connected with the control detection module so as to detect the inner side size of the automobile covering part. A plurality of second sensors are further arranged on the lower surface of the upper tool and used for detecting the moving value of the telescopic rod. The single-chip microcomputer is used for controlling the mechanical arm and the four stepping motors to move. According to the invention, the positioning reference of the automobile covering part is grabbed by a manipulator