ApplicationNo. CN9228183.2 Patent Application Date April 3, 1992 Name Suona Huoxin Publication (Announcement)No. CN214222 Publication (Announcement) Date September 15, 1993 Class Physics Certification Date June 27, 1993 Priority Application (Patent) Guo Yazhi Address 1. Hu Xianggen, the inventor (designer) of No.328, Building 2, No.43, Bao Jiajie, Xicheng District, Beijing, Guo Yazhi, the patent agency for international application, announced the date of entry into the country, and the agent of Komatsu Patent Office, summarized a suona movable core, the inner tube of which is connected with a gas tag and a gas nozzle, and has a bolt groove, and a spring is put on it, which is inserted into the outer tube with a threaded hole on the side surface, and then a bolt and nut for fine-tuning sleeve is put on it. Through that long hole of the sleeve and screw into the threaded hole, and then into the bolt groove of the inn pipe, the telescopic distance of the inner pipe is adjusted with screws and nut, and after the air nozzle is compressed by the lips, the interval of the inner pipe is shortened, so that each sound hole can blow out a semitone, the volume range of the suona is increased, and various tone sandhi music can be played. The invention relates to a movable core, which is characterized in that the inner tube (1) of the movable core is a tubular part with a tapered hole in the inner cavity, the middle part is provided with a bolt groove (2), the upper end of the inner tube (1) is connected with a gas tag (3) into a whole, the gas tag (3) is provided with a tapered gas nozzle (4), and the outer tube (4) of the movable core has a slightly larger upper diameter and a threaded hole on the right side. The fine adjustment screw (11) passes through the edge nut (1) and the long groove (9) of the sleeve (8), and then enters the bolt groove (2) of the inner pipe after being screwed into the threaded hole (7), and the lower end of the movable core is installed in the suona rod of the suona.