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基于DSP的磨機物料監(jiān)測系統(tǒng)設計
2020年電子技術應用第9期
代少升,李金鑫
重慶郵電大學 通信與信息工程學院,,重慶400065
摘要: 為了解決球磨機在運行過程中的工作負荷監(jiān)測問題,,設計了一款基于數(shù)字信號處理器(DSP)的磨機物料監(jiān)測系統(tǒng)。系統(tǒng)硬件主要由電源電路,、磨音采集電路,、信號處理電路和液晶(LCD)數(shù)據(jù)顯示電路組成。系統(tǒng)通過拾音器采集磨音信號,,利用離散傅里葉變換(DFT)將磨音時域信號變換到頻域,,根據(jù)Parseval定理計算磨音能量,最后通過多項式擬合的方式得出磨音能量與磨機物料的關系,。系統(tǒng)在DSP中進行磨音信號的實時處理,,將處理的頻譜、聲音強度(分貝值)和物料比實時顯示在LCD觸摸屏上,,以便監(jiān)控人員優(yōu)化生產(chǎn)工藝。實驗結果表明,,系統(tǒng)可有效地監(jiān)測磨機工況,,計算磨機的負荷比,在實際的球磨機作業(yè)中得到了應用,。
中圖分類號: TN705,;TP274
文獻標識碼: A
DOI:10.16157/j.issn.0258-7998.191290
中文引用格式: 代少升,李金鑫. 基于DSP的磨機物料監(jiān)測系統(tǒng)設計[J].電子技術應用,,2020,,46(9):98-101.
英文引用格式: Dai Shaosheng,Li Jinxin. Design of mill material moitoring system based on DSP[J]. Application of Electronic Technique,,2020,,46(9):98-101.
Design of mill material moitoring system based on DSP
Dai Shaosheng,Li Jinxin
College of Communication and Information Engineering,,Chongqing University of Posts and Telecommunications,, Chongqing 400065,China
Abstract: In order to solve the problem that monitoring the working load of the ball mill during its operation, a monitoring system of the mill material based on digital signal processor(DSP) is designed. The hardware of the system is mainly composed of four kinds of circuit, i.e., the power circuit, the grinding sound acquisition circuit, the signal processing circuit and the Liquid Crystal Display(LCD) data display circuit. The system collects the grinding sound signal through the pickups, transforms grinding signal in time domain to frequency domain by discrete Fourier transform(DFT), calculates grinding energy according to Parseval′s theorem. Finally, the system gets the relationship between energy and material by polynomial fitting. The system processes the grinding sound signal in real time by DSP. Meanwhile, for the monitor personnel can optimize the production process, the processed spectrum, sound intensity(decibel value) and material ratio are displayed on the LCD touch screen. The experimental results show that the system can effectively monitor the working condition of the mill and calculate the load ratio of the mill, and it has been applied in the actual operation of the ball mill.
Key words : ball mill,;grinding,;material monitoring;digital signal processor(DSP)

0 引言

    磨機是水泥生產(chǎn)中的物料粉磨設備,,在其運行過程中有“空磨”,、“飽磨”,、“正常磨”3種狀態(tài)。當球磨機處于“空磨”,、“飽磨”狀態(tài)時,,會降低球磨機的工作效率,增加磨機功耗,。因此,,使球磨機工作處于“正常磨”的工況,能夠有效提高球磨機的工作效率,。目前,,球磨機物料的監(jiān)測方法有:基于數(shù)學模型的磨機負荷軟測量、磨音法,、振動法,、功率法、超聲波檢測法,、神經(jīng)網(wǎng)絡法等[1-2],。在磨機長期的工作中表明:當磨機物料較低時,球磨機發(fā)出的聲音(簡稱磨音)主要來自鋼球以及研磨介質(zhì)與襯板之間的摩擦和碰撞,,磨音頻率較高,,且聽起來清脆;當磨機物料增加時,,鋼球以及研磨介質(zhì)與襯板之間被物料所填充,,磨音頻率降低,磨音從清脆變得沉悶[3],。因此,,通過對磨音的監(jiān)測,可以有效確定磨機物料,,而且磨音法是目前磨機物料監(jiān)測最有效方法之一[4],。因此,本文基于上述特性,,根據(jù)磨音法設計出一款基于DSP的磨機物料監(jiān)測系統(tǒng),,該系統(tǒng)使用拾音器采集音頻信號,通過DSP對磨音數(shù)據(jù)的實時處理,,將處理的磨音頻譜,,聲強值和物料比實時顯示在LCD觸摸屏上,以便監(jiān)控人員參考,。系統(tǒng)還具有頻段可調(diào),、增益可調(diào)、閾值去噪等特點。




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作者信息:

代少升,,李金鑫

(重慶郵電大學 通信與信息工程學院,,重慶400065)

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