| 摘要 |
A bridge breaker has balls between casing and inner ring for supporting inner ring as rotatable without independent ball bearings for easiness and cost down of machining, and seal rings having square shape section are laid on same horizontal level surfaces of casing and inner ring and depressed by air pressure for preventing powder entering into the device and frequent exchange of packing, and blade is fixed to inner ring by connection by shaft and hole for preventing troubles caused by looseness or leasing of connecting bolts. |
