围带自锁状态下内弧表面的最大离心应力发生在外拉筋孔截面的拉筋孔靠进汽侧处；
When the blade shroud under the status of self locking, the maximum centrifugal stress of the concave will occurred on the section of outer lace hole and nearby the leading edge.
该中巢的内孔壁上设有限拉凸筋，张力弹簧抵靠该凸筋的下端。
The inner hole wall of the middle nest is provided with a draw limiting convex rib, and the tension spring contacts the lower end of the convex rib.
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