| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and a device for measuring the length of a hot long-size material such as a hot steel pipe on a conveyance line, by which the top end and the tail end of a material to be measured are highly accurately detected and constraints on the installation space of equipment are also remarkably improved. <P>SOLUTION: In the method of measuring the length of the hot long-size material, by which the hot long-size material 1 is conveyed on the conveyance line 2 by taking its longitudinal direction as a conveyance direction and its length is measured by taking the hot long-size material as a material 1 to be measured, a radiation thermometer 3 for measuring the temperature of the material 1 to be measured on the conveyance line 2 is provided and the top 1a and the tail end 1b of the material 1 to be measured are detected on the basis of the temperature detected values by the radiation thermometer 3 when the material 1 to be measured is passed through the position of the radiation thermometer 3 and the length of the material 1 to be measured is calculated on the basis of the conveyed amount L of the material 1 to be measured during the time difference between a top end detected time t1 and a tail end detected time t2 of the radiation thermometer 3. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
