本文選題：帶式輸送機　切入點：變頻調速驅動　出處：《內蒙古科技大學》2014年碩士論文

【摘要】：隨著社會的不斷發(fā)展，社會對能源的需求逐漸增加，雖然中國是一個儲煤大國，但是我們的煤炭開采量并不能滿足社會的需求，所以一個礦井的開采量要隨著社會需求的增加不斷提升。而一個礦井要想提高產煤量，運輸系統(tǒng)就必須提升，目前大型煤礦的運輸系統(tǒng)基本都采用帶式輸送機，因這種裝置運量大、成本低，且維護比較簡單，所以倍受歡迎。 在文中建立了帶式輸送機的動力學模型，分析了各種啟動方案對帶式輸送機啟動特性的影響，找出了帶式輸送機的最佳啟動加速度曲線;分析了各個電機的驅動功率的理想分配和實際分配的問題，找出了調節(jié)功率平衡的方法。本文在對帶式輸送機的工作原理和特性分析與研究的基礎上，對其驅動系統(tǒng)進行了深入地研究。目前大型帶式輸送機的驅動裝置主要采用CST（Controlled Start Transmission可控傳動技術）驅動系統(tǒng)，隨著電力電子技術的不斷發(fā)展，變頻調速驅動系統(tǒng)將逐漸成為主流。本文首先對變頻調速技術、PLC等理論知識進行簡要闡述，然后依據帶式輸送機的特性設計了一套由變頻器控制的三電機驅動系統(tǒng)。因帶式輸送機是一種典型的恒轉矩負載，且控制要求較高，故選用西門子公司生產的SIMOVERT MV系列矢量控制方式變頻器。利用MATLAB軟件在矢量控制方式和SVPWM調制技術的基礎上分別對其啟動特性和三電機間的功率配比進行了仿真，三電機間的功率平衡本文采用了主-從控制方式，即設定其中一臺電機為主電機，其他兩臺為輔機。在仿真實驗的基礎上，本文選定了一部帶式輸送機，依據帶式輸送機的驅動電機選取了6SE80-1AA01變頻器，，并依據控制要求采用S7-300PLC進行控制。文中采用PROFIBUS通信協議實現了PLC與變頻器間的聯絡，利用CP5611板將IPC接入PROFIBUS通信網絡中，通過此網絡將數據傳輸到上位機。 實驗結果表明，變頻軟啟動系統(tǒng)能夠實現大型帶式輸送機在啟動過程中對驅動力輸出變化的要求，延長了啟動時間，大大降低了輸送帶內的啟動張力。同時變頻驅動系統(tǒng)的使用可降低輸送帶的強度進而減少設備投資成木，變頻驅動還具有維護量少和節(jié)能的優(yōu)點。
[Abstract]:With the continuous development of society, the demand for energy is gradually increasing. Although China is a big coal storage country, our coal mining capacity cannot meet the needs of the society. Therefore, the mining capacity of a mine must continue to increase with the increase of social demand. If a mine wants to increase its coal production, the transportation system must be upgraded. At present, the transportation systems of large coal mines are basically using belt conveyors. This device is popular because of its large capacity, low cost and simple maintenance. In this paper, the dynamic model of belt conveyor is established, and the influence of various starting schemes on the starting characteristics of belt conveyor is analyzed, and the optimum starting acceleration curve of belt conveyor is found out. This paper analyzes the problems of the ideal and practical distribution of the driving power of each motor, and finds out the method of regulating the power balance. In this paper, the working principle and characteristics of the belt conveyor are analyzed and studied. At present, the driving device of large belt conveyor mainly adopts CST(Controlled Start Transmission controllable transmission technology) drive system, with the development of power electronic technology, The drive system of frequency conversion speed regulation will gradually become the mainstream. Then, according to the characteristics of belt conveyor, a three-motor drive system controlled by frequency converter is designed. The belt conveyor is a typical constant torque load, and the control requirement is high. Therefore, the frequency converter of SIMOVERT MV series vector control mode produced by Siemens Company is selected. Based on vector control mode and SVPWM modulation technology, the start-up characteristics and power ratio of three motors are simulated by MATLAB software, respectively. The power balance between the three motors is based on the master-slave control mode, that is, one motor is set as the main motor and the other two are auxiliary machines. On the basis of the simulation experiment, a belt conveyor is selected in this paper. According to the driving motor of the belt conveyor, the 6SE80-1AA01 inverter is selected, and the S7-300PLC is used to control it according to the control requirements. In this paper, the communication between the PLC and the inverter is realized by PROFIBUS protocol, and the IPC is connected into the PROFIBUS communication network by using the CP5611 board. The data is transmitted to the upper computer through this network. The experimental results show that the variable frequency soft start system can meet the requirement of driving force output change in the starting process of large belt conveyor and prolong the start-up time. At the same time, the use of frequency conversion drive system can reduce the strength of conveyor belt and reduce the equipment investment into wood. Frequency conversion drive also has the advantages of less maintenance and energy saving.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH222

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