Metal strip descaling equipment and method and sand blaster used therefor

Abstract

The invention provides a metal plate strip descaling device and method and a sand throwing device used by the metal plate strip descaling device. Sand particles and liquid are thrown to the surface ofa metal plate strip through the sand throwing device, wherein an isolation part and a diversion separation part arranged in a descaling medium conveying pipe divide a conveying pipe into a liquid containing cavity provided with a liquid ejecting opening and a sand particle containing cavity provided with a sand particle ejecting opening, the mixed sand particles and liquid conveyed together are separated, and the sand throwing device ejects the liquid and the sand particles from the respective ejection openings and strikes the surface of the metal plate strip to remove an oxide layer on the surface of the metal plate strip. The metal plate strip is struck by throwing the sand particles and the liquid from the different ejection openings, so that the striking surfaces formed by the sand particles and the liquid on the surface of the metal plate strip are overlapped, the sand particles and the liquid are mixed on the surface of the metal plate strip, the uniformity of removing the oxidelayer on the surface of the metal plate strip is guaranteed, the better surface quality of the metal plate strip is obtained, and the better economic effect is achieved.

Description

technical field [0001] The invention belongs to the field of descaling of metal strips, and relates to a descaling equipment for metal strips, a method for descaling metal strips and a sand blaster used therefor, which use sand and liquid to descale metal strips through separate projections. In particular, it relates to a dephosphorization medium conveying device in a sand blaster. Background technique [0002] In the production process of metal strips, especially in the stage of hot-rolled strips, a layer of oxide layer is formed on the surface of metal strips. In the subsequent production and use of metal strips, the oxide layer must be removed, that is, removed Sheet metal with scales. At present, there are mainly two methods for large-scale removal of scales on metal strips. One is to use strong acid to clean metal strips. This method removes the oxide layer of metal strips quickly, but the hydrochloric acid pollution environment, high iron loss, and poor surface quali...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for large-scale removal of scales on metal strips. One is to use strong acid to clean metal strips. This method removes the oxide layer of metal strips quickly, but the hydrochloric acid pollution environment, high iron loss, and poor surface quality of metal strips, and this method produces a large amount of waste acid, which has high processing costs and has a huge impact on environmental protection; the other is the use of sand and liquid projection technology, that is, sand It is mixed with liquid to form a slurry, and the mixed slurry is hit on the surface of the metal strip by a sand blaster, and the oxide layer is removed through the impact and friction of the sand particles. The role of the liquid is to transport sand particles, lubricate, and prevent dust, but this The disadvantage of this process is: when the slurry formed by mixing sand particles and liquid is thrown to the steel belt through the sand liquid mixture outlet 001 of the sand thrower, due to the large difference in density between the sand particles and the liquid, the impact of the sand particles and the liquid on the surface of the metal strip There will be a position difference when the surface is hit, and the sand ejection area 002 and the liquid ejection area 003 cannot completely overlap (see figure 1 ), the uniformity of descaling on the surface of the metal strip is poor, which affects the appearance quality of the surface of the metal strip

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