推荐回答(1个)
不是,有顺时旋紧,逆时针旋松。也有顺时旋松,逆时针旋紧的。看螺丝的功能用途;右旋:符合右手定则,右手握拳,将右手的大拇指指向螺旋件的运动方向,其余四指方向指向螺旋件的旋转方向。
上紧右旋螺丝(尤其是螺丝)适合右手用力的生理特点,因此作为一个标准规范被执行。常见的螺丝、螺栓,如果不加以说明,都是右旋的。
螺丝的旋转方向有两种!一种是你说的左转右拧!一种是左拧右旋的方式!因为利用人体工程力学的原理 一般常用的是第一种方式!因为这样比较省事!第二种就是为了防止人们因为习惯性的旋转方式而采取避免扭开而生产的!
与人体工程学关系最紧密的是运动系统中的骨骼、关节和肌肉,这三部分在神经系统支配下,使人体各部分完成一系列的运动。骨骼由颅骨、躯干骨、四肢骨三部分组成,脊柱可完成多种运动,是人体的支柱,关节起骨间连接且能活动的作用,肌肉中的骨骼肌受神经系统指挥收缩或舒张,使人体各部分协调动作。
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