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The shield based on charging pile port can ensure safe use of charging pile, and it is an important device. For achieving to recognize and process the stuck state of the shield between the shield open and closed, This paper puts forward a method to detect the stuck state, which based on velocity feedback, and designs detection circuit including the limit position and the speed, and determination procedures of the shield’s state of motion. the limit position is detected by photoelectric sensor, and the speed is detected by magnetic sensor. Test result shows that the system can feedback the limit position and the stuck state of the shield instantaneously, and achieve automatic control between the shield open and closed with control correctly and safely.

With the social change, the role behavior of Qin culture's producers and inheritors have changed from traditional to modern, among which the significant symbol is the differentiation of cultural identity and social role. Starting with the historical perspective, social-cultural perspective, etc., and analyzing the role differentiation phenomenon of Qin musicians, this thesis considers that the changes in the role of the Qin musician are influenced by various external strong discourses in different periods. How to maintain the cultural creation and role responsibility of the Qin musicians' self-consciousness under the interaction of various external forces becomes the key to the successful protection and inheritance of the Qin cultural heritage.