The tapered windscreen flow field of the fan is composed of the outer ring turbulent jet and the inner sink, which tightly closes gas and dust to ensure the safety production.

风扇环形外腔产生的正压湍流射流在内腔负压汇流作用下形成锥形风幕流场，将处于流场范围内的气体及粉尘严密封闭起来，使安全生产得到保障。

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The plane rotation axis system adopted for the bridge is composed of plane rotation axis, inner and outer safety legs and plane ring slideway.

大桥采用的平面转动轴心体系由平面转动轴心、内外保险腿和平面环形滑道组成。

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The invention discloses a safety-type toy boomerang, including a leaf blade, whose outer margin is provided with a ring-shape guard ring.

本发明公开了一种属于玩具的安全型飞去来去，包括叶片，叶片的外缘具有环形的护圈。

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