US 11,808,720 B2
Edge crack detection device, rolling mill facility and edge crack detection method
Yoichi Matsui, Hiroshima (JP); and Yuta Odawara, Hiroshima (JP)
Assigned to PRIMETALS TECHNOLOGIES JAPAN, LTD., Hiroshima (JP)
Appl. No. 17/913,342
Filed by PRIMETALS TECHNOLOGIES JAPAN, LTD., Hiroshima (JP)
PCT Filed Aug. 18, 2020, PCT No. PCT/JP2020/031091
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2022/038668, PCT Pub. Date Feb. 24, 2022.
Prior Publication US 2023/0142679 A1, May 11, 2023
Int. Cl. G01N 23/18 (2018.01); G01N 23/16 (2018.01); B21B 38/00 (2006.01)
CPC G01N 23/18 (2013.01) [B21B 38/00 (2013.01); G01N 23/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An edge crack detection apparatus for detecting an edge crack of a metal plate being conveyed, the edge crack detection apparatus comprising:
a detection part including a plurality of elements arranged along a plate width direction of the metal plate, each of the plurality of elements being configured to be capable of detecting presence or absence of the metal plate at a position of the element in the plate width direction;
a plate edge position determination part configured to determine a plate edge position of the metal plate in the plate width direction on the basis of a detection result of each of a plurality of first elements positioned within a first region in the plate width direction, from among the plurality of elements; and
an edge crack detection part configured to detect an edge crack of the metal plate on the basis of a detection result of each of a plurality of second elements selected on the basis of the plate edge position and positioned within a second region which is narrower than the first region in the plate width direction, from among the plurality of elements,
wherein the edge crack detection part is configured to determine a possibility of existence of the edge crack of the metal plate on the basis of whether the second element positioned at an inner side of the plate edge position detects absence of the metal plate, from among the plurality of second elements,
wherein the edge crack detection apparatus includes:
an upstream side edge crack detection part being the edge crack detection part;
a downstream side edge crack detection part being the edge crack detection part and being disposed at a position different from that of the upstream side edge crack detection part in a conveyance direction of the metal plate; and
a first determination part configured to determine that the metal plate has the edge crack if, at the same time, only one of the upstream side edge crack detection part or the downstream side edge crack detection part determines that there is a possibility of the edge crack.