crown bar

1. 顶杆：crow bar 撬棒 | crown bar 顶杆 | crown wheel 盘形轮

2. 顶杆 炉顶支柱：crown bar yoke || 顶杆轭 | crown bar || 顶杆 炉顶支柱 | crown block || 定滑轮

3. 顶杆,洞顶木,炉顶支柱：crown adjustment ==> (轧制过程中的)辊型调整 | crown bar ==> 顶杆,洞顶木,炉顶支柱 | crown bar bracket ==> 顶杆托架