Fixing structure for casting mud core with ultra-large length-diameter ratio

The utility model provides a fixing structure of a casting mud core with an ultra-large length-diameter ratio, which comprises a cavity mud core, a bottom core head is arranged at the bottom end of the cavity mud core, and the bottom core head and a casting bottom box form conical positioning fit; a top core head is arranged at the top end of the cavity mud core, the top core head and the fixed mud core form conical positioning fit, the fixed mud core is arranged in the center of a positioning boss through conical positioning, the positioning boss is arranged in the casting cover box, and an embedded mud core sleeve is arranged in the casting cover box and located on the periphery of the positioning boss. According to the fixing structure, the position of the mud core is fixed by designing and positioning the mud core at the bottom and the head of the ultra-large-length-diameter-ratio casting mud core and fixing the core head, so that the quality defects of mud core eccentricity, fault iron drilling and the l