Scale Removing Method and Scale Removing Apparatus

Abstract

A scale removing apparatus 7 in accordance with the present invention subjects the internal surface of the steel pipe 3 to a blasting process wherein abrasive particles (not shown) are ejected through a high-pressure jet nozzle 2 and collide with the internal surface of the steel pipe 3. The scale removing apparatus 7 has the high-pressure jet nozzle 2 for ejecting the abrasive particle, a dust collector 4 for collecting dust particles after blasting, and restraining means 6 for restraining air from flowing into the steel pipe 3 from an end part of the steel pipe 3 along with the transfer of abrasive particle ejected through the high-pressure jet nozzle 2. Therefore, the scale can be removed without scattering of dust particles into the atmosphere even with a low-capacity dust collector.

1 . A method for removing a scale formed on an internal surface of a steel pipe by subjecting the internal surface of the steel pipe to a blasting process wherein abrasive particles are ejected through a high-pressure jet nozzle and collide with the internal surface of the steel pipe,
 wherein the blasting process is performed while air is restrained from flowing into the steel pipe from an end part of the steel pipe along with the transfer of the abrasive particle.   
     
     
         2 . An apparatus for removing a scale formed on an internal surface of a steel pipe by subjecting the internal surface of the steel pipe to a blasting process wherein abrasive particles are e jetted through a high-pressure jet nozzle and collide with the internal surface of the steel pipe,
 wherein the apparatus has:   
       the high-pressure jet nozzle for ejecting the abrasive particles; 
       a dust collector for collecting dust particles after blasting; and 
       restraining means for restraining air from flowing into the steel pipe from an end part of the steel pipe along with the transfer of the abrasive particles. 
     
     
         3 . The apparatus for removing scale according to  claim 2 ,
 wherein the dust collector is installed so as to be capable of collecting dust particles from a pipe end on the opposite side to a nozzle insertion end of the steel pipe, and   the restraining means is formed of a plate material having a size capable of covering the nozzle insertion end of the steel pipe and has a through hole where the high-pressure jet nozzle can be slid.   
     
     
         4 . The scale removing apparatus according to  claim 2 ,
 wherein the dust collector is installed so as to be capable of collecting dust particles from a pipe end on the opposite side to a nozzle insertion end of the steel pipe, and   the restraining means is attached to the outer periphery of the high-pressure jet nozzle and is formed of a disc-shaped plate material having an outside diameter equivalent to an inside diameter of the steel pipe so as to be capable of sliding in the steel pipe.   
     
     
         5 . The scale removing apparatus according to  claim 2 ,
 wherein the restraining means, which is formed of a plate material having a size capable of covering the end part of the steel pipe, is installed at a pipe end on the opposite side to a nozzle insertion end of the steel pipe, and   the dust collector is installed so that dust particles can be collected from the same pipe end as the nozzle insertion end of the steel pipe.