double bell meaning in Chinese

双料钟
双铃

Double bell top
双料钟炉顶
Feeding mechanism : bucket hoisting and manual double bell jar feeding mechanism is adopted , which is easy to operate and can prevent gas leakage efficiently
加煤机构：采用斗提卷扬机构，手动双钟罩加煤装置，操作简便、能有效防止煤气泄漏。
Feeding mechanism : up roller , middle flashboard and down bell jar or double bell jar feeding mechanism with hydro - automatic drive , featured as easy operation , convenient maintenance and good air - tightness
加煤机构：液压驱动自动加煤装置，采用上滚筒中插板下钟罩机构或双钟罩结构，操作简单，维修方便，气密性好。