Patent ID: 7367518
Filing Date: 2008-05-06
Classification: B05B,B21B

Abstract:
1. A descaling nozzle for removing scale from a steel plate surface by discharging water from a nozzle, wherein the nozzle has a nozzle orifice comprising: a discharge orifice opening at a concave surface or concave area of a front end, wherein the discharge orifice opening has a minor diameter D a tapered segment extending towards the upstream side from said discharge orifice with a taper angle θ of 30 to 80°; and a large-diameter segment continuing with said tapered segment, said large-diameter segment having an inner diameter D the ratio (D wherein the discharge flow from the nozzle spreads in a single direction (width direction) within a plane perpendicular to the central axis of the nozzle, and the nozzle has an erosion thickness angle of 1.5 to 3° in the direction (thickness direction) that is perpendicular to the width direction, when said erosion thickness angle is determined for an aluminum of JIS-5050 under the conditions of a letting pressure of a spray of 15 MPa, a spray distance of 150 mm and an aluminum erosion time of 900 seconds.