Crucible protective plate for quasi-G7 cast ingot thermal field

The invention discloses a crucible protective plate for a quasi-G7 cast ingot thermal field. The crucible protective plate device is arranged on the outer side of a quartz crucible in a sleeving manner; the crucible protective plate device comprises a plurality of protective plates A and protective plates B; the protective plates A and the protective plates B are all of 135-degree flanged structures; the protective plates A and the protective plates B are of mutually connected octahedral structures; mutually connected parts on two sides of the protective plates A and the protective plates B are of corresponding step structures; a plurality of bolt holes are formed in the step structures on two sides of the protective plates A; a plurality of elliptical through holes corresponding to the bolt holes are formed in the step structures on two sides of the protective plates B, and are fixedly connected with the bolt holes through graphite bolts. The protective plate can meet a thermal fieldinternal-empty use demand