Spiral water-cooled hearth roll

Abstract

The invention discloses a spiral water-cooled hearth roll, which f comprises a roll body and roll shafts connected to both ends of the roll body. The roll shafts are inserted into ends of the roll body to form cooperation and fixed connection. The roll body is provided with an axial through-hole, and the roll shafts at the two ends are internally provided with a water inlet and a water outlet respectively communicated with the axial through-hole in the roll body. The inner wall of the axial through-hole in the roll body is provided with a spiral groove. Further improvements lie in that: the axial spiral groove has a corrugated section, and the spiral angle of the axial spiral groove is 10 degrees-30 degrees. In the premise of ensuring the structural intensity of the hearth roll, the roll body can be fully cooled, a good cooling effect can be achieved, and deformation of the hearth roll at high temperature can be effectively prevented.

Description

technical field [0001] The invention relates to the field of a strip hot-dip galvanizing heating furnace, and more specifically relates to a bottom roll of a strip hot-dip galvanizing heating furnace. Background technique [0002] At present, the hearth rollers of the strip hot-dip galvanizing heating furnace are mostly cooled by water. The hearth roll of the strip hot-dip galvanizing heating furnace in the prior art includes a roll body and a roll shaft connected to both ends of the roll body. The roll shaft is inserted into the end of the roll body to form a fit and fixed connection; the roll body is provided with an axial through hole, The roller shafts at both ends are respectively provided with a water inlet and a water outlet connected to the axial through hole in the roller body. When in use, cooling water enters from the water inlet of the roller shaft at one end, flows through the axial through hole in the roller body, and flows The water outlet of the roller shaft...

AI Technical Summary

Problems solved by technology

The hearth roll of the strip hot-dip galvanizing heating furnace in the prior art has a simple structure and is easy to manufacture, but the cooling water passes through the straight cylindrical axial through hole almost in a straight line, and cannot fully exchange heat with the roll body, so the cooling effect is not good ;In order to obtain a better cooling effect, it is often necessary to increase the diameter of the axial through hole in the roller body, but this will inevitably reduce the structural strength of the hearth roller

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