Cooling device for heat treatment of metal belts

Abstract

The invention relates to a cooling device for the heat treatment of metal belts. The cooling device for the heat treatment of metal belts is characterized by comprising a cooling chamber, a spray system and a high-voltage system, wherein the cooling chamber is provided with an inlet and an outlet through which a metal belt continuously passes; the spray system comprises a medium supply system, a medium supply system pipe and a nozzle, and a spout of the nozzle faces the metal belt in the cooling chamber; and the high-voltage system comprises a high-voltage power supply, a net electrode and an insulation device; the net electrode is arranged between the metal belt in the cooling chamber and the nozzle, the net electrode is arranged on the inner wall of the cooling chamber by the insulation device, and the net electrode is connected with the high-voltage power supply by a high-voltage power line. According to the invention, atomized droplets can be subjected to charging treatment by high voltage loaded by the net electrode, and under the joint action of surface tension, electric field force, gravity, coulomb force and the like, the sizes of atomized droplets sprayed to the metal belt are more uniform, thereby facilitating the achievement of a good surface quality of the metal belt.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a high-pressure spray cooling device for the surface of a metal strip. Background technique [0002] In the existing metal strip heat treatment process, especially in the metal strip heat treatment cooling process, the cooling technology that directly sprays the gas mist to the metal strip through the gas-mist cooling nozzle, water spray cooling nozzle, etc., is more commonly used, which meets the requirements The production of more common varieties of metal strip products, but its defects make it difficult to meet the production of some high-grade metal strip products. Its defects are mainly manifested in: the size distribution range of atomized droplets produced by ordinary gas-mist cooling nozzles, water spray cooling nozzles, etc., that is, the size uniformity of atomized droplets is poor. On the one hand, the kinetic energy of atomized droplets with large...

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Problems solved by technology

[0002] In the existing metal strip heat treatment process, especially in the metal strip heat treatment cooling process, the cooling technology that directly sprays the gas mist to the metal strip through the gas-mist cooling nozzle, water spray cooling nozzle, etc., is more commonly used, which meets the requirements The production of more common varieties of metal strip products, but its defects make it difficult to meet the production of some high-grade metal strip products

Its defects are mainly manifested in: the size distribution range of atomized droplets produced by ordinary gas-mist cooling nozzles, water spray cooling nozzles, etc., that is, the size uniformity of atomized droplets is poor. On the one hand, the kinetic energy of atomized droplets with large size differences is different. When sprayed onto the surface of the metal strip, it will affect the surface quality of the metal strip, especially the impact on the coated product is more significant; on the other hand, the atomization The uniformity of the droplet size is poor, resulting in uneven cooling capacity of the metal strip, which is not conducive to the shape control of the metal strip

Combining the above factors, it is difficult to produce metal strips with high surface quality requirements, especially coated products with high surface quality requirements

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