| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a length measurement method and a device for a hot long material that can measure the length of a long material after hot rolling with precision at a low cost while the long material is conveyed in a length direction. <P>SOLUTION: A plurality of analog HMDs 12<SB POS="POST">1</SB>, 12<SB POS="POST">2</SB>, ..., 12<SB POS="POST">n</SB>are arranged at predetermined sensor arrangement intervals in order from a load cell 10 as a rear-end sensor to a conveyance line downstream side, and a threshold for front-end detection is determined by using the analog HMD 12<SB POS="POST">1</SB>on the most upstream side and set to the analog HMDs 12<SB POS="POST">2</SB>, ..., 12<SB POS="POST">n</SB>on downstream sides, which are used as front-end sensors. The length of a long material (steel pipe) 1 is calculated from rear-end detection time of the rear-end sensor (load cell), front-end detection time of a front-end sensor (analog HMD) having detected a front end immediately before, and the sensor arrangement interval. <P>COPYRIGHT: (C)2012,JPO&INPIT |
