【正文】
more and more people concerns their design of realtime online monitoring of wire rope for broken wires, introduced the classification of wire rope nondestructive testing and nondestructive testing and trends in the development process. The design is based on magnetic flux leakage principle, the use of Hall sensors to detect magnetic flux leakage signals, magnetic flux leakage sensor analog signal that directly to the circuit input voltage signal, through followup circuit and software processing, Wire Ropes pleted the task of designing nondestructive testing . Signal processing system consists of three operational amplifiers with high mon mode rejection ratio amplifier and low pass filter circuits, the realization of Wire Ropes signal amplification and filtering, through the amplification, filtering the processed signal through the ADC0809 for A / D conversion, converted data access microcontroller AT89C51, through software programming, the MCU control LED displays the voltage value, and by the number of LED lights to judge the situation Wire Ropes. First of all programs written in the Proteus simulation software, in theory, AD conversion and data to achieve the basic functions. In the simulation based on the schematic drawing of the system built in the universal test circuit board, and has been debugged, to achieve the desired objectives. This design not only to detect internal defects in steel wire rope and wire rope metal cross section can be quantitatively detected. Online realtime detection of all rope, high efficiency, free from anthropogenic influence factors, bined with manual inspection and quantitative analysis of test data to evaluate the extent and intensity of wire rope damage losses.KEY WORDS:Wire rope ,Hall sensor, Amplifying ,Filtering,A / D conversion, SCM目 錄前 言 1第1章 鋼絲繩無損檢測的分類 2第2章 鋼絲繩無損檢測裝置設計 3167。本設計基于漏磁原理,利用霍爾傳感器檢測漏磁信號,采用模擬的傳感器漏磁信號,即直接給電路輸入電壓信號,經(jīng)過后續(xù)電路和軟件處理后,完成了鋼絲繩斷絲無損檢測的設計任務信號處理系統(tǒng)主要由三運放高共模抑制比放大電路和低通濾波電路構成,實現(xiàn)了對鋼絲繩斷絲信號的放大和濾波,經(jīng)過放大、濾波處理后的信號經(jīng)過ADC0809進行A/D轉(zhuǎn)換,轉(zhuǎn)換后的數(shù)據(jù)接入單片機AT89C51,經(jīng)過軟件編程后,單片機控制數(shù)碼管將電壓數(shù)值顯示出來,并通過LED燈亮的多少來判斷鋼絲繩斷絲情況編寫的程序首先在Proteus軟件上進行仿真,在理論上實現(xiàn)AD轉(zhuǎn)換和數(shù)據(jù)顯示的基本功能。為了實時在線監(jiān)測鋼絲繩斷絲,介紹了鋼絲繩無損檢測的分類和無損檢測的發(fā)展歷程和趨勢??蓪崟r在線全繩檢測,檢測效率高,基本不受人為因數(shù)影響,結(jié)合人工檢查和檢測數(shù)據(jù)定量分析可評估鋼絲繩損傷程度和強度損失情況。 檢測元件 5167。 放大電路 8167。 AT89C51 13167。然而,鋼絲繩作為一種工程承載構件,在使用過程中,由于種種原因必然會發(fā)生疲勞、銹蝕、磨損甚至驟斷等現(xiàn)象,其操作程序及承載能力直接關系到設備及人身安全。第1章 鋼絲繩無損檢測的分類傳統(tǒng)的鋼絲繩檢測方法是人工目視掛紗檢查斷絲,用卡尺測量直徑。因此這種方法有許多不足之處。鋼絲繩無損檢測技術正是在不破壞鋼絲繩結(jié)構的情況下,應用一定的檢測方法對鋼絲繩的機械性能、內(nèi)部結(jié)構、工作狀態(tài)進行檢測,并依據(jù)檢測結(jié)果和一定的準則對鋼絲繩技術狀態(tài)做出評估。第2章 鋼絲繩無損檢測裝置設計167。本設計采用霍爾元件陣列組合檢測與聚磁檢測相結(jié)合的方法,霍爾元件陣列組合檢測是在鋼絲繩軸向間隔一定距離布置兩個檢測環(huán),各環(huán)上分別布置多片霍爾元件,將兩環(huán)上位于同一軸剖面內(nèi)兩個檢測元件檢測信號進行差分或加法處理,以達到消除股波噪聲的目的。聚磁器包圍于鋼絲繩外圍,沿鋼絲繩軸向成對順次放置,每對聚磁環(huán)的凸臺相對,在兩環(huán)的凸臺中間放置霍爾元件[2]。在鋼絲繩電磁無損檢測原理的應用中,鋼絲繩的磁化方法多種多樣,從所選擇的勵磁源的性質(zhì)來分,有交流勵磁法和直流勵磁法。特別是隨著近幾年新型永磁材料的開發(fā)和應用,永久磁鐵勵磁正越來越多地代替直流有源勵磁方式。為減小回路體積,提高勵磁回路性能,一般選用高剩磁、高矯頑力、高磁能積的永磁材料。另外,釹鐵硼磁鐵是一種鐵基材料,成本低廉而倍受世人關注。167。隨著鋼絲繩相對于檢測線圈和勵磁器的運動,鋼絲繩將被勵磁器逐段磁化至飽和狀態(tài),若鋼絲繩存在損傷,其內(nèi)部磁通量(與鋼絲繩的有效金屬斷面積成正比)必然減