Qingdao Hexin Machinery Co., Ltd. found another Chinese patent with the patent application number of 200920186762.X and the invention titled "composite roller for roller hearth furnace", 
which discloses a furnace roller for roller hearth furnace, which consists of a steel shaft, a roller ring and a It is composed of refractory material, the roller ring is fixed on the steel shaft, 
and the refractory material is arranged on the steel shaft between the roller rings. The characteristic is that the roller ring is composed of a steel inner ring and a high temperature resistant outer ring. 

The through shaft water-cooled roll is the most important equipment in the CSP (Compact Strip Production, compact strip steel production line) roller hearth heating furnace. 
It is mainly composed of a supporting roller shaft, a water-cooled steel pipe, a metal roller body, a heat-resistant metal roller ring, and a refractory heat insulating lining between the roller rings, etc. 
Its structure is complex and the production cost is high; The load-bearing of the heat-resistant metal roll ring is used to support the thin slab casting billet. 

Through the forward and reverse rotation and speed adjustment of the water-cooled roll, as well as the friction drive between the roll ring and the thin slab casting billet,
the billet transportation in the furnace and the adjustment of the buffer time are completed, to realize the heating process in the slab furnace.
The non-contact parts of the water-cooled roller and the slab are all wrapped with a refractory insulation layer to ensure the support strength and rigidity of the water-cooled roller under high temperature conditions,
and to reduce the water cooling and heat loss of the furnace roller. Therefore, the water-cooled roller has the worst working environment, not only to withstand high temperature,
Furnace gas erosion and corrosion, and also need to bear the influence of casting heavy pressure, impact and friction, resulting in serious mechanical damage to the refractory insulation lining and roll ring.
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