High-strength vertical thermal insulation pipe with stable structure

The utility model is applicable to the technical field of thermal insulation pipes, and provides a high-strength vertical thermal insulation pipe with a stable structure, which comprises a thermal insulation pipe, a sliding sleeve, a fixed sleeve, a connecting bolt, a first sliding block, a pressure spring and a second sliding block, the sliding sleeve is connected at one end of the thermal insulation pipe in a sliding manner, and the fixed sleeve is fixed at the other end of the thermal insulation pipe; a first sliding groove and a second sliding groove are formed in the fixing sleeve, the first sliding block and the second sliding block are slidably connected into the first sliding groove and the second sliding groove respectively, and the two ends of the compression spring are connected with the first sliding block and the second sliding block respectively. When the sealing ring is aged and the elasticity is reduced, the pressure spring pushes the second sliding block to move rightwards, and meanwhile, the