| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has body with blow channels, four feathers, armored by hard-alloy inserts, core hollow in central portion and grooves in end portion for removing destruction products. Hard-alloy inserts are made tungsten-cobalt and have diameter equal to (0.25-0.35)D, and height of feathers with armored hard-alloy inserts is (0.5-0.5)D, where D - crown diameter. ^ EFFECT: higher reliability, increased wear durability of crown body and limit energy of single strike. ^ 2 dwg |
