| 摘要 |
PROBLEM TO BE SOLVED: To provide a bolt looseness monitoring device of a swivel type boom work machine capable of certainly monitoring the looseness of a plurality of bolts by detecting the looseness of a small number of bolts.SOLUTION: The bolt looseness monitoring device of a swivel type boom work machine in which one of the inner and outer wheels of a swivel wheel of a swivel stand having a boom is fixed via a plurality of bolts is provided. Of the plurality of bolts fixing the inner wheel or outer wheel of the swivel wheel, a shaft part 41 of at least one bolt 40 includes an easy-to-deform small diameter part 42 and a strain gauge 60 for detecting a strain of the small diameter part 42, thereby monitoring the looseness of the plurality of bolts. |
