In view of the demand for construction machinery at home and abroad, especially in the Middle East, Southeast Asia and some developed European and American countries and regions, considering the price of air intake muffler when the original Botan, Liebherr and other tower cranes are updated, at the same time, due to the improvement of the quality of tower cranes in China, many domestic and foreign customers begin to turn to the Chinese market for partners, so our company develops fs7030 (chip type, self elevating The installation, transportation and technical content of the medium-sized tower crane with the length of muffler are higher than those of the original domestic small and medium-sized tower crane. This project is mainly used in the automatic winding machine of the spinning equipment. It is an effective key equipment to realize the unconnected spinning process. It can detect and control many indexes in the spinning process online. Technology and equipment suitable for precision calibration (0.1-0.05-0.02%) of low vacuum (0-1kpa-10kpa) can be used to manufacture calibration of low vacuum (direct pressure measurement) sensors and purchase technical services for them.