这只不过是一块塑料大螺母和螺栓在每个结束。
It is simply a piece of plastic with a large nut and bolt at each end.
该工艺主要材料包括对拉螺栓、PVC套管、塑料封头、竖骨架、铝合金骨架等。
The main materials of this technology are split bolt, PVC casing, plastic head, vertical skeleton and aluminum alloy skeleton.
特征是包括飞轮、塑料风叶轮，塑料风叶轮用螺栓紧固在飞轮的螺孔上。
The invention is characterized in that the invention includes a flywheel and a plastic fan blade which is tightly fixed on the screw hole of the flywheel by a bolt.
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