Device for removing foreign matter from roll surface, method for removing foreign matter from roll surface, and method for manufacturing steel strip

Abstract

A device for removing foreign matter from a roll surface. The device includes a blast processing unit and a press unit. The blast processing unit includes an ejection unit configured to eject a projectile material at a surface of a roll that conveys a steel strip inside a heating furnace, and a recovery unit configured to recover the projectile material. The press unit is configured to press the blast processing unit toward the surface of the roll.

1 . A device for removing foreign matter from a roll surface, the device comprising:
 a blast processing unit including an ejection unit configured to eject a projectile material at a surface of a roll that conveys a steel strip inside a heating furnace, and a recovery unit configured to recover the projectile material; and   a press unit configured to press the blast processing unit toward the surface of the roll.   
     
     
         2 . The roll surface foreign matter removal device according to  claim 1 , wherein:
 the ejection unit is provided at a center of the blast processing unit; and   the recovery unit is provided at a periphery of the ejection unit.   
     
     
         3 . The roll surface foreign matter removal device according to  claim 1 , wherein:
 the blast processing unit has a double-walled tubular shaped body configured from an inner tube and an outer tube surrounding the inner tube; and   the inner tube is the ejection unit and the outer tube is the recovery unit.   
     
     
         4 . The roll surface foreign matter removal device according to  claim 3 , wherein a flexible member is provided at an end of the outer tube. 
     
     
         5 . The roll surface foreign matter removal device according to  claim 1 , further comprising a detection unit configured to detect a distance between the blast processing unit and the surface of the roll. 
     
     
         6 . The roll surface foreign matter removal device according to  claim 5 , wherein ejection of the projectile material by the ejection unit is halted, in a case in which the distance between the surface of the roll and the blast processing unit is detected by the detection unit to be a specific value or greater. 
     
     
         7 . The roll surface foreign matter removal device according to  claim 1 , further comprising a movement mechanism configured to move the blast processing unit along an axial direction of the roll. 
     
     
         8 . The roll surface foreign matter removal device according to  claim 1 , further comprising a roll rotation mechanism configured to rotate the roll. 
     
     
         9 . The roll surface foreign matter removal device according to  claim 1 , wherein:
 the ejection unit is configured to eject the projectile material together with a gas; and   the recovery unit is configured to recover the projectile material together with the gas by using suction.   
     
     
         10 . The roll surface foreign matter removal device according to  claim 9 , wherein the ejection unit is configured to eject the gas in a pressure range of from 0.2 MPa to 0.5 MPa. 
     
     
         11 . The roll surface foreign matter removal device according to  claim 1 , wherein the ejection unit is configured to project the projectile material against the surface of the roll at a projection angle of from 80 degrees to 90 degrees, as viewed along an axial direction of the roll. 
     
     
         12 . The roll surface foreign matter removal device according to  claim 1 , wherein the projectile material is alumina particles. 
     
     
         13 . A method for removing foreign matter from a roll surface, the method comprising:
 a process of pressing the blast processing unit of the roll surface foreign matter removal device according to  claim 1  against the surface of the roll; and   a process of ejecting the projectile material from inside the blast processing unit and recovering the projectile material inside the blast processing unit.   
     
     
         14 . The roll surface foreign matter removal method according to  claim 13 , wherein, in processing of ejecting the projectile material, after a first projectile material having a first average particle size has been ejected, a second projectile material having a second average particle size smaller than the first average particle size is ejected. 
     
     
         15 . A method for manufacturing a steel strip, the method comprising:
 a process of removing foreign matter on a surface of a roll provided inside a heating furnace by using the roll surface foreign matter removal method according to  claim 13 ; and   a process of passing a steel strip through inside the heating furnace where the roll is provided, and performing heat treatment.   
     
     
         16 . The steel strip manufacturing method according to  claim 15 , wherein:
 the process of removing is performed while rotating the roll by imparting rotational force using a rotation mechanism abutted against the surface of the roll.   
     
     
         17 . The steel strip manufacturing method according to  claim 15 , wherein the steel strip is a high tensile steel.