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发明背景以前的气动扭矩扳手以机械方式靠转子旋转作功产生冲击,然后再把冲击转换为所需要的扭矩。在这样的系统中,由于一次冲击的扭矩大,容易产生不规则的紧固扭矩,因而需要操作者有一定的技能才能以均匀的扭矩完成紧固工作,且冲击噪声高,会引起噪声污染。此外,冲击引起的噪声和振动,会给操作者精神和身体都造成疲劳,并有得上斯氏综合症或出现雷诺德现象。事实上,这正在成为社会关心的课题。所以,利用油压冲击从而防止噪声和振动的扭矩扳手作为
BACKGROUND OF THE INVENTION Previous pneumatic torque wrenches mechanically generated impact by rotating the rotor and then converted the impact to the required torque. In such a system, because of the large impact torque, irregular tightening torques are easily generated. Therefore, it is necessary for the operator to have a certain skill to complete the tightening work with uniform torque, and high impact noise can cause noise pollution. In addition, the noise and vibration caused by the impact can cause mental and physical fatigue to the operator and lead to Syndrome or Reynolds phenomenon. In fact, this is becoming a topic of social concern. Therefore, the use of hydraulic impact to prevent noise and vibration torque wrench as