【正文】
Abstract: GPS is a satellite navigation and positioning system developed by America. Through 24 satellites evenly distributed in the air, the system ensures that positioning information could be well received all over the world at any time. Since the system was put into operation, it has been widely applied to uses such as oil surveying, ship and aircraft navigation, construction positioning and military operation. Key Words: GPS , cranes, Port Machinery GPS is a satellite navigation and positioning system developed by America. Through 24 satellites evenly distributed in the air, the system ensures that positioning information could be well received all over the world at any time. Since the system was put into operation, it has been widely applied to uses such as oil surveying, ship and aircraft navigation, construction positioning and military operation. ZPMC began the study of GPS application on yard cranes two years ago with the purpose of providing the RTG with functions such as reliable straight traveling of gantry and automatic container management like RMG (Rail Mounted Crane) while keeping the RTG of its flexibility on yard changing(through longitudinal traveling). The GPS products developed by ZPMC have a positioning accuracy a round177。1 5mm (remended)or 。通過空中均勻分布的 24 顆導航衛(wèi)星,保證了定位信號在全球任何地方任意時間全天候的可靠接收。成千上萬集裝箱的數(shù)據(jù)記錄 手工工作量是巨大的,另外 RTG 缺乏有效位置監(jiān)控,難免造成集裝箱的錯誤安放而無法跟蹤 —— 這種錯誤.對于繁忙的集裝箱碼頭來說,造成的損失是嚴重的。 四 .RTG 防誤操作功能利用 RTG 大車的精確位置,并結(jié)合小車和起升機構(gòu)位置,組成 RTG 吊具的三維信息,根據(jù)碼頭堆場的實際布置,可轉(zhuǎn)換成具體的集裝箱大車箱位、小車堆位和起升層高 (BERTH, BAY, LANE/ STACK, TIER)等信息.此信息同要作業(yè)的集裝箱比較.如不符則禁止吊具動作,只有信息致才允許作業(yè)。其中涉及的不足有 : 的位置不夠清楚,調(diào)度上容易產(chǎn)生舍近求遠問題,增加生產(chǎn)成本;2. RTG 實際吊具位置沒有可靠監(jiān)控 ,司機作業(yè)存在認為錯誤的可能性; 3.司機作業(yè)完畢需要人工確認 配備了 RTG 用 GPS 系統(tǒng)后,利用當前普遍的無線電系統(tǒng),可以有效消除 RTG 作業(yè)中存在的各種人工因素.整個生產(chǎn)過程由系列電腦實現(xiàn)閉環(huán)控制極大地提高碼頭生產(chǎn)的正確性和信息化水平,實現(xiàn)無紙化管理。15 mm) * 電臺有效范圍: 3km * 電臺頻率可選范圍: 450470MHz; 或其它用戶申請頻率 * 標準 RS232 接口輸出,適用于各種 PLC 裝置 * 狀態(tài)量 8 位 ,24VDC 光耦隔離輸出 三、為了方便用戶選購,目前 ZPMC 可以提供兩種類型的 RTG 用 GPS 系統(tǒng): 1.雙 GPS 系統(tǒng) —— 定位精度 177。 二、技術(shù)參數(shù) * 工作電源輸入電壓: AC220V177。利用 GPS系統(tǒng)可監(jiān)測大車兩側(cè)打滑情況,以利于同步控制。同步控制不好,則會造成大車車輪打滑或“啃軌”現(xiàn)象,從而降低起重機的使用性能和壽命。 15mm 左右,具有高度的自動化特征,