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(dá)，目前的電動(dòng)馬達(dá)分為有刷和無(wú)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(jī)里面頂在換相器表面，電機(jī)轉(zhuǎn)動(dòng)的時(shí)候，將電能通過(guò)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(yīng)定期維護(hù)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(wú)刷電機(jī)工作原理?無(wú)刷電機(jī)采取電子換向，線圈不動(dòng)，磁極旋轉(zhuǎn)。無(wú)刷電機(jī)，是使用一套電子設(shè)備，通過(guò)霍爾元件，感知永磁體磁極的位置，根據(jù)這種感知，使用電子線路，適時(shí)切換線圈中電流的方向，保證產(chǎn)生正確方向的磁力，來(lái)驅(qū)動(dòng)電機(jī)。了有刷電機(jī)的缺點(diǎn)。
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(wú)刷電機(jī)雖然稍貴，但是由于故障率極低，壽命長(zhǎng)，相對(duì)性價(jià)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(guó)內(nèi)扭矩型扳手的扭矩可達(dá)10000牛米左右，而德國(guó)電動(dòng)扳手的扭矩可達(dá)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(zhuǎn)速，轉(zhuǎn)速直接決定了工作效率，轉(zhuǎn)速快的扳手，能為操作者節(jié)省寶貴的工作時(shí)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(huì)在達(dá)到預(yù)設(shè)扭矩時(shí)精確的停止旋轉(zhuǎn)，特別是對(duì)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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