High-temperature-resistant water-cooling furnace bottom roll

Abstract

The invention discloses a high-temperature-resistant water-cooling furnace bottom roll. The furnace bottom roll adopts a double-layer drum, wherein two sections of roll shafts are respectively arranged at two ends of a core shaft; a cooling water through hole is axially formed in the center of the core shaft; a heat insulation coating is arranged in the outer surface of the inner drum of the double-layer drum; the double-layer drum is sleeved on the core shaft; two shaft stoppers are respectively sleeved on the core shaft and positioned at two ends of the double-layer drum; and a plurality ofmetal support blocks in annular arrangement are axially arranged between the core shaft and the inner drum of the double-layer drum at intervals. The furnace bottom roll overcomes the defects of the tradition furnace bottom roll, has a longer service life, greatly reduces the failure rate of a heat-treatment furnace, and guarantees the normal operation of the heat-treatment furnace and the quality of steel plate blank products.

Description

technical field [0001] The invention relates to a high-temperature-resistant water-cooled bottom roller. Background technique [0002] The hearth rollers are installed in the solid solution heat treatment furnace to transport the steel slabs for heat treatment to realize the continuous heat treatment process. The hearth rollers in the high temperature section operate in the temperature range of 1000-1200 ℃ and in the oxidative environment heated by open flames , these hearth rollers must be able to maintain the ability to transport high-temperature slabs during long-term continuous work. Under such harsh conditions, the currently used hearth rolls are centrifugally cast with high-nickel-chromium alloys to improve their oxidation resistance. In order to prevent the deformation of the roll body, the center shaft of the hearth rolls passes through the cooling water structure. The mandrel and the roll surface are welded with high-nickel-chromium alloy support blocks to avoid hi...

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Problems solved by technology

Increase the flow rate and flow of cooling water to obtain a better cooling effect and maintain the original "red bayberry" roughness of the roll surface as cast; however, it is still difficult to overcome the local convex deformation of the support block on the roll surface in the high temperature section. At the same time, the performance of the roll surface is uneven, and the accelerated oxidation of the weak parts makes the "red bayberry"-shaped particles protrude more significantly, which will cause scratches on the product steel plate. At the same time, the uneven temperature distribution of the roll surface affects the heat treatment of the steel plate slab Quality, the measures taken have not achieved the expected actual effect, the failure of hearth rollers and the decline in the quality of slab products are still the primary factors restricting the normal production

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