【正文】 C的通信口為RS485，兩者之間要進(jìn)行通信，必須有裝置將兩種不同信號進(jìn)行轉(zhuǎn)換。PC/PPI電纜就是一種實現(xiàn)該功能的部件。在通信時，如數(shù)據(jù)由RS232 向RS485傳輸，則電纜時發(fā)送狀態(tài)，反之是接受狀態(tài)。接收狀態(tài)與發(fā)送狀態(tài)相互轉(zhuǎn)換要一定時間。轉(zhuǎn)換時間與設(shè)置的波特率有關(guān)，它們之間的關(guān)系參見下表。通常情況下電纜是出于接收狀態(tài)。當(dāng)檢測到RS232發(fā)送數(shù)據(jù)時，電纜立即從接收狀態(tài)轉(zhuǎn)換到發(fā)送狀態(tài)。若電纜處于發(fā)送狀態(tài)的時間超過電纜轉(zhuǎn)換時間，電纜自動切換為接收狀態(tài)?！￠_關(guān)設(shè)置于波特率對應(yīng)關(guān)系開關(guān)1,2,3傳輸速率/(b/s)轉(zhuǎn)換時間/ms00038400001192001010960020114800410024007101120014110600283)通訊格式本系統(tǒng)中S7200的RS232通訊口設(shè)置為9600bps，8位數(shù)據(jù)位、1位停止位、無奇偶校驗。通訊報文格式如下所示：AFlagD1～～～DnVB 通訊報文格式注：A：數(shù)據(jù)傳輸?shù)钠鹗挤梢栽O(shè)置為其他字符）Flag：通訊錯誤標(biāo)志，？－標(biāo)志上次傳輸?shù)腻e誤數(shù)據(jù)；＠－標(biāo)志上次傳輸?shù)恼_數(shù)據(jù)D1～Dn：字節(jié)，傳送數(shù)據(jù)的報文，n－傳送數(shù)據(jù)的個數(shù)V：校驗字節(jié)，數(shù)據(jù)校驗采用字節(jié)異或校驗方式B：數(shù)據(jù)傳輸?shù)慕Y(jié)束符（可以設(shè)置為其他字符）4)數(shù)據(jù)校驗為了保證傳輸數(shù)據(jù)的可靠性，防止在傳輸過程的錯誤指令被執(zhí)行，所有傳輸數(shù)據(jù)都要進(jìn)行異或循環(huán)校驗：前兩個字節(jié)異或結(jié)果再與第三個字節(jié)異或，依次類推，直到最后一個字節(jié)，其結(jié)果就是發(fā)送數(shù)據(jù)中的校驗碼，存在發(fā)送數(shù)據(jù)校驗字節(jié)內(nèi)。若校驗碼前后的相一致，則表明傳輸數(shù)據(jù)正確；若不一致，則表明傳輸有誤，需要重新發(fā)送。通訊程序的結(jié)構(gòu)框圖如下所示： 通訊程序結(jié)構(gòu)框圖6 總 結(jié)1．通過查閱大量書籍和資料，了解跳汰選煤是指在交替上升和下降的水流中，使受分選的物料按顆粒密度不同進(jìn)行分離的過程；同時對影響跳汰機(jī)工藝的因素，例如風(fēng)量和水量、跳汰頻率與振幅、風(fēng)閥周期等等進(jìn)行了深入的研究，為接下來進(jìn)行的風(fēng)閥控制系統(tǒng)設(shè)計打下基礎(chǔ)。2．作為跳汰機(jī)的關(guān)鍵設(shè)備――電磁風(fēng)閥，它的在工作好壞直接影響到精煤產(chǎn)量。在對各類風(fēng)閥及其優(yōu)缺點的分析后，初步確定了風(fēng)閥控制系統(tǒng)中PLC輸出控制采用中斷響應(yīng)法，通過分析比較選取最優(yōu)控制策略，達(dá)到了控制精度的進(jìn)一步提高。3．在簡要介紹控制系統(tǒng)原理及各個部分作用的基礎(chǔ)上，對S7200 系列PLC的電源模塊、輸入輸出模塊、CPU模塊等內(nèi)容學(xué)習(xí)研究，確定了本控制系統(tǒng)采用SIEMENS S7200 CPU226作為核心模塊，100～230V AC電源、24V DC輸入、繼電器輸出，對33路I/O地址進(jìn)行具體分配，完成了硬件選型工作。4．詳細(xì)介紹了中斷響應(yīng)法在本控制系統(tǒng)中的應(yīng)用，根據(jù)風(fēng)閥控制系統(tǒng)的總體結(jié)構(gòu)框架，對PLC參數(shù)初始化、排序與計算、完整跳汰周期和中斷響應(yīng)等部分進(jìn)行相應(yīng)的程序開發(fā)。通過仿真實驗，驗證了程序的正確性，獲得較好的仿真結(jié)果?！　∮捎谒接邢?，加之時間倉促，本文中的疏漏與錯誤之處在所難免，望各位老師指正。參考文獻(xiàn)[1] ,8(4)：57[2] [碩士學(xué)位論文].太原：太原理工大學(xué)，2003[3] 梁金鋼，趙環(huán)帥，. ，（1）：6064[4] [碩士學(xué)位論文].太原：太原理工大學(xué)，2003[5] 馬方清，（3）：293296[6] [碩士學(xué)位論文].太原：太原理工大學(xué)，2003[7] [碩士學(xué)位論文].天津：天津大學(xué)，2004[8] [博士學(xué)位論文].太原：太原理工大學(xué)，2004[9] ，（8）：56[10] [碩士學(xué)位論文].安徽：安徽理工大學(xué)，2006[11] 石峻嶺，姜忠學(xué)，王曉飛. ，（1）：164166[12] 王澤南，36（6）：7981[13] ，（1）：376378[14] ，（5）：2830[15] ，(4)：2123[16] 張永強(qiáng)，（3）：2627[17] ，（4）：5254[18] ，23（11）：8587[19] 陳冬冰，（1）：6567[20] ，（8）：2122[21] Satish T S Bukkapatnam, et al. 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B., Controllability of Fuzzy Control Systems, IEEE Trans. Syst. Man Cybern. 1986, P576582.[29] Law C K System. Using Fuzzy Numbers in Educational Fuzzy Sets and Systems，1996，83(3): Grading 311一324[30] 曹懷俊，跳汰機(jī)電磁風(fēng)閥微機(jī)控制的應(yīng)用，煤礦機(jī)械，2001年第三期 P46一47[31] Gibson, ., Nonlinear Automatic Control, McGrawHill, 1962[32] 王忠顯、高郁等，可編程控制器在跳汰機(jī)氣動風(fēng)閥中的應(yīng)用，煤礦機(jī)械，1997年第二期，P5455翻譯部分英文原文Autodischarging System for Jigging Machine Based on SRMAbstractThis paper introduces an autodischarging system for jigging machine based on switched reluctance motor (SRM). In this system, SRM is used to replace the traditional asynchronous motor. The hardware system, controller and software design methods are discussed in this paper. AT89C51 is taken as the core ponent of the speed regulation controller for SMR and works with other peripheral circuits to realize effective control on motor. The experiment shows that autodischarging system for jigging machine based on SRM is feasible and can play an important role in stabilizing clean coal ash content, reducing clean coal loss, improving product quality and separation efficiency.Keywords：Jigging machine, autodischarge system。 switched reluctance motor1. INTRODUCTIONThe jigging machine is a kind of mechanical mineral sorting equipment and occupies an important position in the production of the large modem coal preparation plant. However, the automation level of jigging machine has been outdated. The backward control mode in jigging coal preparation restricts the product quality, separation efficiency and process ability. One of the reasons is the lower efficiency of the motor which is used monly in discharging system for jigging machine. How to improve the efficiency of motor has an important significance for improving coal preparation efficiency and stabilizing product quality.　　Switched reluctance motor (SRM) with better start characteristics is suitable for starting frequently in adverse environmental condition, high temperature and even strongvibration conditions and keeps higher efficiency. Based on these characteristics, we use switched reluctance motor instead of the traditional asynchronous motor to developautodischarging system for jigging machine based on SRM. The experiment shows that autodischarging system for jigging machine based on SRM is feasible and can play an important role in stabilizing clean coal ash content, reducing clean coal loss, improving product quality and separation efficiency.II. CONSTITUTION OF SPEEDREGULATION SYSTEM FOR SWITCHED RELUCTANCE MOTORSThe speedregulation system for switched reluctance motor is posed of SRM, power converter, controller and detector, as shown in Figure 1.Figure. 1 The structure of the SRM speedregulation system1) Switched reluctance motorSwitched reluctance motor is the key ponent of SRM speedregulation system.2) Power converterThe power converter is a circuit device that is used to drive SRM and provide power for SRM. The on and off status of