At present, the research of constant torque electric wrench mostly focuses on the digital display constant torque electric wrench with both constant value and overload failure function. It is very popular with users with the humanized LCD window. Moreover, they all have the functions of torque value monitoring, peak setting and early warning. Some also have wireless transmission function to communicate with the equipped wireless transmission terminal, and the terminal records and manages data.

從傳統(tǒng)的指針式扭矩扳手到現(xiàn)在的具有多種功能的數(shù)顯定扭矩電動扳手伴隨著科技的發(fā)展實現(xiàn)了質(zhì)的飛躍?，F(xiàn)有的定扭矩電動扳手具有以下優(yōu)點:①技術(shù)成熟、性能穩(wěn)定;②操作界面人性化;③數(shù)據(jù)處理功能強等。

From the traditional pointer torque wrench to the digital display fixed torque electric wrench with multiple functions, it has achieved a qualitative leap with the development of science and technology. The existing constant torque electric wrench has the following advantages: ① mature technology and stable performance; ② Humanized operation interface; ③ Strong data processing function, etc.

定扭矩電動扳手存在的不足：

Shortcomings of constant torque electric wrench:

（1）系統(tǒng)組件多操作復雜

(1) Multiple system components and complex operation

文獻《指針式扭矩扳手在施工中的應(yīng)用》中提出了一種智能扭矩扳手系統(tǒng)包含電子標簽，扭矩扳手，信息管理軟件等，通過一系列的智能芯片完成所需功能。使用該扳手系統(tǒng)時,需要同時啟動計算機，并對螺栓信息進行編號，信息錄人管理軟件，制作電子標簽貼在相應(yīng)的螺栓上。準備工作完畢后才能發(fā)揮扭矩扳手的功能，使用效率比較低，操作比較復雜。同類的扭矩扳手均存在結(jié)構(gòu)復雜的問題。

In the document "Application of pointer torque wrench in construction", an intelligent torque wrench system is proposed, which includes electronic label, torque wrench, information management software, etc. the required functions are completed through a series of intelligent chips. When using the wrench system, it is necessary to start the computer at the same time, number the bolt information, record the information into the management software, make an electronic label and stick it on the corresponding bolt. The function of the torque wrench can only be brought into play after the preparation. The use efficiency is relatively low and the operation is relatively complex. Similar torque wrenches have the problem of complex structure.

（2）精度和難兩全

(2) Accuracy and price are difficult

目前市場上的定扭矩電動扳手存在著精度和難兩全的困境，精度較高的扳手通常是數(shù)顯式定扭矩電動扳手，進口產(chǎn)品居多，普遍較高。較低的多為結(jié)構(gòu)簡單的指針式扭矩扳手，其精度低，難以滿足使用要求。這也是扭矩扳手在相關(guān)領(lǐng)域應(yīng)用不夠廣泛的原因之一。

At present, the constant torque electric wrench in the market has the dilemma of accuracy and price. The wrench with higher accuracy is usually digital display constant torque electric wrench, most of which are imported products, and the price is generally high. Most of the low price are pointer torque wrenches with simple structure, which have low precision and are difficult to meet the use requirements. This is also one of the reasons why torque wrenches are not widely used in related fields.

（3）智能化程度低

(3) Low intelligence

現(xiàn)有的定扭矩電動扳手都具有施加和監(jiān)控扭矩值的功能,但是對于規(guī)格不同的螺栓施加多大的扭矩值仍需要人工設(shè)定。針對不同螺栓的預緊扭矩值的大小需要查詢相關(guān)手冊或者運用公式計算得知。目前只有一些特殊的行業(yè)的產(chǎn)品會附帶螺栓預緊力的相關(guān)資料。常用的普通螺栓的預緊力具體數(shù)值仍然靠經(jīng)驗來確定,這也是阻礙定扭矩電動扳手應(yīng)用的原因之一。

The existing constant torque electric wrenches have the function of applying and monitoring torque value, but the torque value applied to bolts with different specifications still needs to be set manually. For the pre tightening torque values of different bolts, you need to consult relevant manuals or use formulas to calculate. At present, only some products of special industries will be attached with relevant data of bolt preload. The specific value of preload of common bolts still depends on experience, which is also one of the reasons that hinder the application of constant torque electric wrench.