This utility model relates to the technical field of ultra-small threaded elements of experimental twin-screw extruders, in particular to a small mandrel, which comprises a core body, an inner bolt and a shaft sleeve. A mounting hole penetrating both ends is arranged in the middle of the shaft sleeve, the inner bolt and one end of the core body are inserted into the mounting hole from both ends of the shaft sleeve respectively and connected by a spring in the mounting hole. The advantages are as follows: 1. The production difficulty is reduced; due to the split combination, the core body can be processed from an ultra-hard round bar through medium thread processing, with high hardness, good quality and greatly prolonged service life, which is more than 4 times that of the traditional integral type; 2. The shaft sleeve can be reused, and even if the core body is deformed, it can be reused by replacing the core body, saving costs; 3. The split design allows the length of the core body to be adjusted, maximizing processing convenience; 4. The internal spring body can effectively avoid the deformation of the thimble hole caused by excessive thimble torque.
Country Code: CN
Application Number: CN202321847822.4
