A doublecasing sealed structure is used in the ionization chamber with thin Windows of large diameter.
电离室采用大口径双重密封结构，制作工艺难度大，要求高。
2
Upper section composed of driving sprocket upper casing with rails (double chain) and discharging outlet.
上部区段，由传动链轮及带有轨道(双排链)的上部机壳、卸料口组成。
3
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