扭矩型扳手的選擇需要注意什么呢？
What should be paid attention to when selecting torque wrenches?
一、看馬達，目前的電動馬達分為有刷和無刷兩種。
1、 Look at the motor. At present, there are two kinds of electric motors: brushless motor and brushless motor.
什么叫碳刷？有刷電機里面頂在換相器表面，電機轉動的時候，將電能通過換相器輸送給線圈，由于其主要成分是碳，稱為碳刷，它是易磨損的。應定期維護更換，并清理積碳。
What is a carbon brush? The brush motor is pushed on the surface of the phase converter inside. When the motor rotates, it transmits electric energy to the coil through the phase converter. Because its main component is carbon, it is called carbon brush, which is easy to wear. It shall be maintained and replaced regularly, and the carbon deposit shall be cleaned.
無刷電機工作原理?無刷電機采取電子換向，線圈不動，磁出色旋轉。無刷電機，是使用一套電子設備，通過霍爾元件，感知永磁體磁出色的位置，根據(jù)這種感知，使用電子線路，適時切換線圈中電流的方向，保證產(chǎn)生正確方向的磁力，來驅(qū)動電機。消除了有刷電機的缺點。
How does the brushless motor work? Brushless motor adopts electronic commutation, the coil does not move, and the magnetic pole rotates. Brushless motors use a set of electronic devices to sense the position of permanent magnet poles through Hall elements. According to this perception, electronic circuits are used to switch the direction of current in the coil at the right time to ensure that the magnetic force in the right direction is generated to drive the motor. The disadvantage of the brush motor is eliminated.
無刷電機雖然價格稍貴，但是由于故障率出色低，壽命長，相對性價比較高。
Although the brushless motor is a little expensive, it has a relatively high cost performance due to its extremely low failure rate and long service life.

二、看扭矩，一般國內(nèi)扭矩型扳手的扭矩可達10000牛米左右，而德國電動扳手的扭矩可達40000牛米。根據(jù)螺栓大小和工藝要求，挑選合適的扭矩范圍。
2、 According to the torque, the maximum torque of domestic torque wrenches can reach about 10000 Nm, while that of German electric wrenches can reach 40000 Nm. Select appropriate torque range according to bolt size and process requirements.
三、看轉速，轉速直接決定了工作效率，轉速快的扳手，能為操作者節(jié)省寶貴的工作時間。
3、 It depends on the speed. The speed directly determines the working efficiency. A wrench with fast speed can save valuable working time for the operator.
四、看精度，精度高的扳手，會在達到預設扭矩時準確的停止旋轉，非常是對擰緊精度要求高的法蘭螺栓，建議使用高精度扳手，可以有效的防止泄露。
4、 The wrench with high accuracy will stop rotating accurately when the preset torque is reached. Especially for flange bolts with high requirements on tightening accuracy, it is recommended to use a high-precision wrench to effectively prevent leakage.
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