Electric torque wrench is favored by construction units in maintenance and installation in some industries because of its convenience, speed and easy operation. In particular, the rechargeable electric torque wrench has become a widely used bolt fastening and disassembly tool in addition to the hydraulic torque wrench. So, how to choose an excellent brand of rechargeable electric torque wrench?

我們知道，一般選用不同于普通電動沖擊扳手的充電電動扭矩扳手說明工況螺栓預緊是要有精 準扭矩要求的，因此是看該款電動扭矩扳手的扭矩范圍是否能夠達到工況使用要求，精度是多少。如果精度過低是無法保障螺栓預緊一定能夠達到預設的，也就是說很可能導致預緊效果不合格。

We know that generally, the rechargeable electric torque wrench different from the ordinary electric impact wrench is selected. Firstly, it shows that the bolt pre tightening under working conditions requires accurate torque. Therefore, the first thing is to see whether the torque range of this electric torque wrench can meet the operating conditions and the accuracy. If the accuracy is too low, it is impossible to ensure that the bolt pre tightening can reach the preset, that is, it is likely to lead to unqualified pre tightening effect.

其次是轉速。很多化工檢修現場之所以不少非重 點法蘭都選用充電電動扭矩扳手同步緊固的原因就是其雖然精度和扭矩不如液壓扳手，但勝在轉速快效率高，對于施工進度有很大幫助。所以，在選用充電扭矩扳手時每分鐘的轉速也是重要指標。

The second is speed. The reason why many non key flanges in many chemical maintenance sites use rechargeable electric torque wrench for synchronous tightening is that although its precision and torque are not as good as hydraulic wrench, it is superior in fast speed and high efficiency, which is very helpful to the construction progress. Therefore, when selecting the charging torque wrench, the speed per minute is also an important index.

再是電池容量與功率。如果說充電扭矩扳手功率小則動力不足，電池容量影響單次充電工作時長，進而也是影響效率，因此也需要對比考量。

Then the battery capacity and power. If the power of the charging torque wrench is small, the power is insufficient, and the battery capacity affects the working time of single charging, which also affects the efficiency, so it also needs to be compared and considered.

還需要對比重量和外形設計是否符合自己工況環(huán)境使用。比如，扳手自重過大就不適合高 強度長時間手持作業(yè)。工況螺栓空間限 制有些設計就無法使用等。

It is also necessary to compare whether the weight and shape design are in line with their own working environment. For example, if the weight of the wrench is too large, it is not suitable for high-intensity and long-time hand-held operation. Working condition bolt space is limited, some designs can not be used, etc.

還需要注意的是充電扭矩扳手設計是否考慮反作用力和噪音對操作者的影響，檢修安裝行業(yè)從業(yè)者長期使用會不會對人臂膀及聽力造成影響。

It should also be noted that whether the impact of reaction force and noise on the operator is considered in the design of charging torque wrench, and whether the long-term use of maintenance and installation industry will affect people's arms and hearing.