To avoid any harm to hands by a sudden close of the upper cover, a fall down damping device is added to the turning mechanism, force the upper cover close slowly.
使上盖可以缓慢下落，从而可以避免上盖猛烈下落时对人手的伤害；
It melt cover close to alloy layer there aren't line the parts, melt cover layers of upper strata organize until tiny branch is the brilliant and equiaxed grain brilliant to make up.
熔覆层接近熔合线部分出现枝状晶，熔覆层上层组织由细小的枝晶及等轴晶组成。
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