1results about How to "Smooth inside and outside" patented technology

The utility model discloses a prefabricated foaming heat preservation pipe which comprises a working steel pipe layer, a polyurethane heat preservation layer is fixedly installed on the outer side of the working steel pipe layer, a high-density polyethylene protection layer is fixedly installed on the outer side of the polyurethane heat preservation layer, and an outer sleeve cylinder is fixedly installed at the rear end of the working steel pipe layer. And an embedded splicing cylinder is fixedly mounted at the front end of the working steel pipe layer. According to the prefabricated foaming heat preservation pipe, the pasting circular rings and the alignment short strips are matched with the outer sleeve cylinder and the embedded splicing cylinder, so that the prefabricated foaming heat preservation pipe is more convenient to splice and firmer after being spliced, the sealing performance of the connecting position is better, the waterproof effect is better, the splicing mode is simpler, and the inside and the outside of the connecting position are smoother; wherein the outer sleeve cylinder and the embedded splicing cylinder are used for splicing, buckling and fixing, the pasting circular ring is used for pasting the polyurethane heat preservation layer and the high-density polyethylene protection layer, rainwater is prevented from directly leaking to the surface of the working steel pipe layer, and the alignment short strips are used for alignment during splicing.