With the improvement of operation accuracy, the requirement of torque wrench is higher and higher in all walks of life, so what should be paid attention to in the selection of torque wrench?

　　電動力矩扳手是一種可以隨電源進(jìn)行扭矩設(shè)定的高精度扳手。它是一種擰緊和拆卸螺栓的工具

　　The electric torque wrench is a kind of high precision wrench which can set the torque with the power supply. It is a tool for tightening and removing bolts

　　扭轉(zhuǎn)剪切型是專門用于扭轉(zhuǎn)剪切型螺栓的扭轉(zhuǎn)。電動扳手按螺栓標(biāo)準(zhǔn)選用。高精度扭矩主要用于有扭矩要求的場合，根據(jù)扭矩大小選用電動扳手;沖擊式電動扳手便宜、效率高，但扭矩精度差，是螺栓標(biāo)準(zhǔn)的電動扳手。

　　Torsion shear type is specially used for torsion of torsion shear type bolts. The electric wrench shall be selected according to the bolt standard. High precision torque is mainly used for occasions with torque requirements, and electric wrench is selected according to the torque size; impact electric wrench is cheap and efficient, but the torque accuracy is poor, which is the preferred electric wrench for bolt standard.

　　，看它的準(zhǔn)確性

　　First, look at its accuracy

　　達(dá)到預(yù)定扭矩后，高精度扳手停止準(zhǔn)確轉(zhuǎn)動。特別是法蘭螺栓的上緊精度高，建議使用高精度扳手，有效防止泄漏。德國電動扳手的一般精度為正負(fù)3%，是目前世界上精度的扳手。

　　After reaching the preset torque, the high-precision wrench stops rotating accurately. In particular, the tightening accuracy of flange bolts is high. It is recommended to use a high-precision wrench to effectively prevent leakage. The general accuracy of the German electric wrench is plus or minus 3%, which is the highest in the world.

　　第二，看看扭矩

　　Second, look at the torque

　　一般情況下，國產(chǎn)力矩扳手的扭矩可達(dá)10000牛頓，而德國電動扳手的扭矩可達(dá)40000牛頓。根據(jù)螺栓尺寸和工藝要求，選擇合適的扭矩尺寸。

　　In general, the maximum torque of domestic torque wrench can reach 10000 newtons, while that of German electric wrench can reach 40000 Newtons. According to the bolt size and process requirements, select the appropriate torque size.

　　三，看速度

　　3、 Look at speed

　　旋轉(zhuǎn)速度直接決定了操作效率，扳手的快速旋轉(zhuǎn)速度，可以為操作者節(jié)省寶貴的操作時間。

　　The rotation speed directly determines the operation efficiency. The rapid rotation speed of the wrench can save the operator precious operation time.

　　四，看馬達(dá)

　　4、 Look at the motor

　　現(xiàn)在有兩種類型的電機(jī):有刷電機(jī)和無刷電機(jī)。

　　Now there are two types of motor: brush motor and non brush motor.

　　什么是碳刷?

　　What is a carbon brush?

　　換向器的頂部內(nèi)部有一個電刷電機(jī)外形，電機(jī)轉(zhuǎn)動時，電能通過換向器傳到線圈上，因為其主要成分是碳，稱為碳刷，所以很容易磨損。應(yīng)定期保護(hù)置換，并清理積存的碳。

　　There is a brush motor shape inside the top of the commutator. When the motor rotates, the electric energy is transmitted to the coil through the commutator. Because its main component is carbon, which is called carbon brush, it is easy to wear. The replacement should be regularly protected and the accumulated carbon removed.

　　無刷電機(jī)工作原理?

　　How does BLDCM work?

　　無刷電機(jī)采用電子換相，線圈不動，磁極轉(zhuǎn)動。無刷電機(jī),是一套電子設(shè)備的使用,通過霍爾元件,對永磁磁極的位置,根據(jù)這一觀念,電子電路的使用,切換時線圈中的電流方向,確保磁力的正確方向,驅(qū)動馬達(dá)。電刷電機(jī)的缺陷。

　　The electric commutation is adopted for the BLDCM, the coil does not move, and the magnetic pole rotates. BLDCM is the use of a set of electronic equipment. Through Hall element, the position of permanent magnet pole is determined. According to this concept, the use of electronic circuit, the direction of current in the coil when switching, to ensure the correct direction of magnetic force and drive the motor. Eliminate the defect of brush motor.

　　無刷電機(jī)雖然有點貴，但因為故障率很低，壽命長，性價比相對較高。

　　Although the BLDCM is a bit expensive, it has low failure rate, long service life and relatively high cost performance.