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等離子熔射自動控制系統結構 2.1 系統組成和工作原理 基于PC+PLC等離子熔射控制系統組成原理如圖1所示。PC主要完成對實體進行三維造型、切片、最后生成機器人能夠識別的機器人路徑代碼,并根據現場反饋信息進行路徑調整,同時也對整個熔射過程進行監控,采樣主要工藝參數并保存到加工過程文檔中。PLC實現對數控旋轉工作臺和整個等離子弧發生子系統實時控制,對現場采樣數據進行初步處理后傳送到上位機PC中。 2.2 PC與PLC功能分配 在等離子熔射過程中,環境惡劣,噪音等污染嚴重,干擾強,系統工作周期長。因此現場設備控制核心采用西門子S7-300型PLC,充分利用該型PLC可靠性和良好的抗干擾能力來保證系統可靠性。并配備了A/D、D/A模塊和CP5611通訊卡,可以實現模擬量采樣與輸出和與上位機之間通訊。同時PLC系統還配備了西門子專用穩壓電源,保證了系統運行穩定性,避免與整個系統共用電源產生干擾。 由于PLC無法進行監控圖表顯示、圖像處理和復雜算法設計,操作人員也不能直觀了解現場狀況[4]。為了彌補以上不足,系統增加PC進行現場監控與數據運算,其主要任務是獲取機器人狀態信息和皮膜溫度采樣信息,根據設定工藝優化算法執行結果進行實時熔射路徑調節;對等離子射流檢測圖像進行處理,反饋調節信息至PLC實現對等離子射流發生裝置調控;同時能對系統故障做出及時報警,并能采取相應應急處理措施和加工現場斷點保護等。 [align=center]
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