Heavy-load antifriction type sealing transmission shaft assembly

The invention discloses a heavy-load antifriction type sealing transmission shaft assembly. The heavy-load antifriction type sealing transmission shaft assembly comprises a transmission shaft and a shell, an installation cavity is formed between the transmission shaft and the shell, and a lower sealing assembly, a lower positioning assembly, a bearing pack assembly, an upper positioning assembly and an upper sealing assembly are sequentially installed in the installation cavity from bottom to top; and the bearing pack assembly comprises a plurality of joint bearing packs, a plurality of conical bearing packs and a plurality of pressure-bearing rings, and the joint bearing packs and the conical bearing packs fixedly sleeve the outer wall of the transmission shaft in a staggered mode. The transmission shaft assembly has the following beneficial effects that the joint bearing packs and the conical bearing packs are arranged on the transmission shaft in a staggered mode, so that the transmission shaft rotates alo