In carbon fiber robot arms, telescopic arm tubes are becoming more and more widely used. A set of carbon fiber telescopic casings provided by Wuxi Zhishang New Materials is used in a smart machine developed by the National Railway Research Institute for tunnel surveying and overhaul. The length of the arm can be extended from one meter to nearly three. The meter is long, under the control of the main arm, the sleeve can work the working box with the detector and other equipment at the front end of the arm to work in a space where the whole machine is inconvenient to enter, such as a narrow depth, effectively expanding the working range of the intelligent machine. . The carbon fiber composite has a high strength, which not only can withstand the weight of the detector at the front end, but also its extremely light weight reduces the energy consumption during mechanical work to a lower level, directly extending the working time and reducing Loss and increase work efficiency.