激光位移式矿浆粒度在线检测系统的研究
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摘要
选矿生产过程中,磨矿粒度是影响选矿技术经济指标的重要参数,但磨矿粒度的在线检测问题一直是从事颗粒度检测技术研究人员所要面对的难题之一,不能够实现在线粒度检测,就不能够实现整个生产过程的闭环控制,就不能完成提高产品质量和优化控制的预期目标。
     本文根据国内外在线粒度检测设备的开发现状,结合工业现场的实际需求,以昆明豪原特自控有限公司设立的重点科技项目——激光位移式矿浆在线粒度智能检测系统为依托,对其进行了深入的研究与分析,将光学技术、传感器技术、自动控制技术及数理统计知识应用于矿浆粒度检测,为实现高精度的实时在线粒度测量提供了理论依据。
     本文首先对位移式测量矿浆粒度进行了理论推导,并详细介绍了基于三角测量法的激光位移式测量原理,提出了检测系统的总体实现方案。其次对检测系统的硬件部分进行了详细设计,其中包括机械装置设计、控制系统的硬件设计和系统的电路设计及控制系统的抗干扰设计。然后对系统的软件部分进行了详细设计,具体包括上位机的软件设计、下位机的软件设计以及上位机与下位机之间的通讯设计。最后介绍了矿浆粒度在线检测的数学模型的实现,对系统所涉及的数学模型进行了论证和推导,建立了基于单点采集的多元线性回归模型,并对基于多点采集的多元回归模型进行了假设。
     本检测系统直接在矿浆主管道之间加入测量装置,区别于其它在线检测装置的取样过程,从真正意义上实现了对矿浆的粒度进行实时在线检测。采样夹头装置的柱塞采用了左右运行的方式,区别于其它在线检测装置的上下运动方式,从而有效地避免了因矿粒沉积在采样夹头上而造成的测量误差,从理论上提高了系统检测的精度。
     通过理论推导、实验研究,表明本文所研究的粒度检测技术具有一定的先进性,实现方法切实可行,具有一定的实用价值和应用前景。
In the process of mill run, ore granularity is the important parameter to influence economic index of mill run. But the on-line measuring of the ore granularity is one of the difficult problems for the researchers who are engaged in the research of the ore granularity. The on-line measuring of ore granularity and the closed-loop control of the whole producing process are the key factors to enhance the quality of products and optimized control.
     Based on the empoldering actualities about on-line granularity measuring equipment at home and abroad, combined with the actual demand, and relied on the key technologyproject of Kunming Hao Yuan Te Control Limited Company--ore on-line granularitymeasuring based on laser displacement sensor which is the intelligent measuring system, the article in-depth studies and analyses the ore granularity on-line measuring based on laser displacement, and applies the optics technique, sensor technique, automation control technique and mathematical statistics in ore granularity measuring. It provides the theoretical basis for realizing the high precision and real time on-line granularity measuring.
     Firstly, the article carries through the theoretical analysis of the measuring ore granularity based on displacement, particularly introduces the measuring principle of the laser displacement based on the way of triangle measuring, and brings forward the overall solution about measuring system. Secondly, the article carries through detailed design about the hardware of the measuring system, including machine design, hardware design of controlling system, circuit design of system and anti-jamming design of controlling system. Thirdly, the article carries through detailed design about software of the system, including the software design of upper PC, the software design of nether PC and communication design between upper PC and nether PC. Finally, the articles introduces the realizing mathematical model about ore granularity on-line measuring, derivates and demonstrate the mathematical model of the system, and founds the multiple linear regression model based on single point acquisition, and carries through hypothesis about multiple regression model based on more acquisition.
     The measuring system directly puts the measuring equipments into the ore main pipeline, distinguishes from the sampling processes of other on-line measuring equipments. It realizes real time on-line measuring to ore granularity in real sense. The pole of the sampling collet adopts the Left-to-Right movement way, distinguishes from the Up-to-Down movement way of other on-line measuring equipments, so it effectively avoids the measuring error because of the ore depositing in the sampling collet and advances the precision of the measuring system.
     Through theoretical derivation and experimental study, it is proved that the study in the article of granularity measuring technique has some advanced nature, the realizing way is practical, and has some practical value and application prospects.
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