At present, the domestic torque wrench testing methods mainly use simple testing equipment, relying on manual loading, which has the problems of low precision, simple function and low efficiency. Foreign special torque testing equipment can achieve high detection efficiency, but it is very expensive and difficult to maintain and expand. The above factors seriously affect the production and inspection of torque wrench.

現(xiàn)代測控技術中，智能儀器、總線儀器和虛擬儀器等微機化測控儀器，都是充分利用計算機的軟件和硬件優(yōu)勢，既增強了參數(shù)測量、處理功能，義提高了性能指。根據(jù)上述理念，利用改進后的機械加載部分融合現(xiàn)代計算機技術，設計了扭矩自動測試系統(tǒng)。

In modern measurement and control technology, intelligent instruments, bus instruments, virtual instruments and other computerized measurement and control instruments make full use of the advantages of computer software and hardware, which not only enhances the function of parameter measurement and processing, but also improves the performance. According to the above concept, the torque automatic test system is designed by using the improved mechanical loading part and modern computer technology.

作為一臺測量檢定儀器，其重要的指標為測量精度。周圍環(huán)境以及系統(tǒng)自身產(chǎn)生的噪聲對微弱電信號干擾較大。硬件方面，通過合理布線、信號屏蔽措施以及濾波電路大部分噪聲的影響；軟件方面，通過大量試驗，采取了合適的采樣頻率和濾波方法，使信號穩(wěn)定的同時確保了必要的靈敏度

As a measurement and verification instrument, its important index is measurement accuracy. The noise generated by the surrounding environment and the system itself has great interference on the weak electrical signal. In terms of hardware, most of the influence of noise is eliminated by reasonable wiring, signal shielding measures and filtering circuit; In terms of software, through a large number of experiments, the appropriate sampling frequency and filtering method are adopted to make the signal stable and ensure the necessary sensitivity

預置式扭矩扳手在使用過程中，達到預沒值之后，出現(xiàn)短暫打滑卸力并發(fā)出警報聲，此后扳手會成為一個死角，相當于呆扳手。根據(jù)上述特性，檢測時先自動加載并實時測量扭矩值，一旦測出_r峰值，就停止加載，記錄峰值，再卸力。因而可以根據(jù)以上過程實現(xiàn)多次自動測試。

In the process of using the preset torque wrench, when it reaches the preset value, it will slip for a short time and release the force and give an alarm. After that, the wrench will become a dead angle, which is equivalent to a solid wrench. According to the above characteristics, the torque value is automatically loaded and measured in real time_ R peak, stop loading, record the peak, and then unload the force. Therefore, the automatic test can be realized many times according to the above process.

判斷扳手是否合格，就是通過比較扳手預設值與所測得峰值。示值式扭矩扳手在使用范圍內加載時，實時顯示扭矩值，不會出現(xiàn)打滑卸力，因而示值式扳手不出現(xiàn)峰值。因為系統(tǒng)有延遲，無法在到達目標扭矩值時精 確停止，此外根據(jù)檢定規(guī)程，測試時扭矩值由低到高單向加載。

To judge whether the wrench is qualified or not is to compare the preset value of the wrench with the measured peak value. When the indicator type torque wrench is loaded in the range of use, the torque value is displayed in real time, and there is no slipping unloading force, so the indicator type torque wrench does not have a peak value. In addition, according to the verification regulation, the torque value is loaded unidirectionally from low to high.

所以采取如下方式：先自動加載略低于目標值的一個扭矩值，再通過手動控制微調目標值，記錄值后自動卸力。因而可以根據(jù)以上過程實現(xiàn)多次自動測試。判斷其合格與否，就是在扭矩加載目標值后比較扳手顯示值與目標值。對于某些特殊扳手的檢定還需要測量其與扭矩相應的轉角，因此測試中還需測量扳手的轉角。

Therefore, the following methods are adopted: first, automatically load to a torque value slightly lower than the target value, then fine tune to the target value through manual control, record the value and then automatically release the force. Therefore, the automatic test can be realized many times according to the above process. To judge whether it is qualified or not is to compare the wrench display value with the target value after the torque is loaded to the target value. For the verification of some special spanners, it is necessary to measure the angle corresponding to the torque, so it is also necessary to measure the angle of the spanner in the test.