空气经加热净化后，由引风机从下部导入，穿过料斗的孔网板。
Purified and heated air is immited from the bottom by fan and passed through the screen plate of hopper.
“盲孔”下部衬垫能够防止泄漏。
在下游动阀罩下部连接有引鞋， 引鞋上开有导流通孔和导流槽。
The lower part of the lower traveling valve is connected to a guide shoe with diversion hole and diversion trench.
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