【摘要】：目前國內(nèi)的扭矩扳手檢定儀多數(shù)是機(jī)械式的,不僅研制周期長,體積龐大,質(zhì)量過重,不易于攜帶；而且其存儲容量小,檢定速度慢,人機(jī)交互復(fù)雜,受使用環(huán)境的限制較大。針對以上情況,本文研制了基于Linux的便攜式扭矩扳手檢定儀。該檢定儀可適用于各大中型企業(yè),具有良好人機(jī)交互界面,同時能夠快速檢定和存儲大量數(shù)據(jù)的。 論文通過研究金屬應(yīng)變片的物理特性,建立了扭矩傳感器物理模型。分析了彎矩及軸向力對扭矩測量精度的影響,得知扭矩值與扭矩傳感器輸出電壓之間存在正比例的關(guān)系。在硬件平臺上,文章對數(shù)據(jù)采集單元進(jìn)行詳細(xì)設(shè)計,單元中包含電源管理電路、模數(shù)轉(zhuǎn)換電路、MSP430采集電路、MSP430與ARM串口通信電路。為滿足便于攜帶的要求,電源管理電路選擇7.4V鋰電池供電；但是由于各電路模塊需要不同的供電電壓,同時設(shè)計了7.4V轉(zhuǎn)5V及5V轉(zhuǎn)3.3V電源轉(zhuǎn)換電路。由于高精度、低功耗的設(shè)計需求,模數(shù)轉(zhuǎn)換電路選用24位帶有超低噪聲放大器的模數(shù)轉(zhuǎn)換器CS5530,轉(zhuǎn)換完成后,通過其串行接口將數(shù)據(jù)傳入采集系統(tǒng)。設(shè)計中要求檢定儀能快速處理大量數(shù)據(jù),數(shù)據(jù)采集由超低功耗MSP430設(shè)計,數(shù)據(jù)處理由ARM嵌入式平臺完成,MSP430與ARM則通過RS232串口進(jìn)行通信。軟件單元由嵌入式Linux、Qt及數(shù)據(jù)庫應(yīng)用軟件平臺組成,主要設(shè)計了系統(tǒng)可視化應(yīng)用程序。主要的軟件功能有：記錄、存儲、顯示最大扭矩值；查詢扭矩檢定結(jié)果及歷史記錄；修改、存儲、打印日期；打印檢定證書；進(jìn)行系統(tǒng)維護(hù)及用戶管理等。 實驗結(jié)果表明,研制的基于Linux的便攜式扭矩扳手檢定儀,其各項技術(shù)指標(biāo)及功能達(dá)到了設(shè)計的要求。為扭矩扳手生產(chǎn)部門及使用扭矩扳手的行業(yè)提供了一種易操作、可視化良好及能夠進(jìn)行大量快速檢定和數(shù)據(jù)存儲的便攜式扭矩板手檢定儀。
[Abstract]:At present, most of the domestic torque wrench calibrators are mechanical, which not only have long development period, large volume, overweight and difficult to carry, but also have small storage capacity, slow verification speed, complex man-machine interaction, and are limited by the application environment. In view of the above situation, a portable torque wrench calibrator based on Linux is developed in this paper. The calibrator can be used in large and medium-sized enterprises. It has a good man-machine interface and can quickly verify and store a large number of data. The physical model of torque sensor is established by studying the physical characteristics of metal strain gauge. The influence of bending moment and axial force on the precision of torque measurement is analyzed, and the positive relationship between torque value and output voltage of torque sensor is obtained. On the hardware platform, the data acquisition unit is designed in detail, which includes power management circuit, analog-to-digital conversion circuit, MSP430 acquisition circuit, MSP430 and ARM serial communication circuit. In order to meet the requirement of easy to carry, the power management circuit chooses 7.4V lithium battery to supply power, but because each circuit module needs different supply voltage, a 7.4V to 5V and 5V to 3.3V power supply conversion circuit is designed at the same time. Due to the requirement of high precision and low power consumption, a 24-bit A / D converter with ultra low noise amplifier (ULNA) is selected for CS5530, conversion, and the data is transmitted to the acquisition system through its serial interface. In the design, the calibrator is required to deal with a large number of data quickly. The data acquisition is designed by ultra-low power consumption MSP430, the data processing is accomplished by ARM embedded platform, and the communication between MSP430 and ARM is carried out through RS232 serial port. The software unit is composed of embedded Linux,Qt and database application software platform. The main functions of the software are: record, storage, display maximum torque value; query torque verification results and historical records; modify, store, print date; print verification certificate; system maintenance and user management. The experimental results show that the portable torque wrench calibrator based on Linux meets the requirements of the design. It provides a portable torque plate hand calibrator for torque wrench production department and industry using torque wrench, which is easy to operate, well visualized and able to carry out a large number of quick verification and data storage.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP368.1;TP216

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