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"重型支援桥作为应急保障力量的重要组成部分，在抢险救灾中起到了关键作用。在架设与撤收中，液压系统作为装备的动力系统，特别是液压系统的心脏——液压泵，这一关键部件的可靠性直接关系到能否完成桥梁架设撤收作业，面对复杂的战场环境，一旦液压系统出现故障，就会导致桥梁架设撤收作业被迫中断，甚至引发危险状态。\n\n那在战时，如果液压泵损坏，该怎样快速完成架桥任务呢？\n\n通过对液压系统分析可知，重型支援桥液压系统采取了“双泵独立供油”的设计理念，因此，如果其中一个液压泵出现损伤，可以采取应急切换的方法，快速完成装备抢修。", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L2", "title": "应急切换是什么", "body": "那什么是应急切换呢？\n\n在装备战场抢救抢修中，切换是一种应急修理方式，其是指通过回路转换或改接，脱开损伤部分，接通备用部分，或者将原来担负非基本功能的完好部分改换到基本功能回路中。\n\n针对重型支援桥，应急切换是指在单个液压泵或取力器出现故障时，通过切换到另一个液压泵继续完成架设或撤收作业的方法。", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L3", "title": "双泵供油回路", "body": "重型支援桥是如何实现应急切换的？\n\n我们从原理上来寻找答案，根据液压系统原理，重型支援桥设置有2个供油回路，一个是前泵供油回路，由前泵提供动力，主要负责为托架液压系统和架设架液压系统提供动力，主要由液压油箱、前泵、前泵出油滤油器、托架多路换向阀连接块内的三通流量调节阀、回油滤油器等构成完整的液压回路；另一个是后泵供油回路，由后泵提供动力，主要负责为支腿液压系统和吊机液压系统提供动力，主要由液压油箱、后泵、后泵出油滤油器、支腿多路换向阀连接块内的三通流量调节阀、回油滤油器等构成完整的液压回路。", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L4", "title": "打开球阀后的回油问题", "body": "此时，我们应该注意到在两个出油滤油器的出口处设置一球阀，在正常情况下，该球阀处于关闭状态。\n\n那如果将该球阀打开，会出现什么样的情况呢？\n\n此处以托架马达向前为例说明，当操作手操作托架马达向前时，来自负载侧的压力会将托架多路换向阀连接块内的三通流量调节阀关闭，此时来自前泵的液压油无法通过托架多路换向阀连接块内的三通流量调节阀返回液压油箱，应通过托架多路换向阀内部通道进入托架马达换向联，而后进入液压马达，推动液压马达旋转。\n\n但此时液压马达侧负载压力较大，液压油便不会进入液压马达，而是经打开的球阀，进入支腿多路换向阀连接块内，通过支腿多路换向阀内的三通流量调节阀返回液压油箱。\n\n操作托架液压系统和架设架液压系统的任一执行机构时，均会出现上述现象。同理可分析，操作支腿液压系统和吊机液压系统的任一执行机构时，也会出现上述现象。\n\n那在前泵损坏的情况下，可否利用液压系统这一设计理念，完成重型支援桥的架设和撤收作业呢？\n\n通过上述分析，操作重型支援桥任一执行机构时，负载侧压力总会关闭相应的多路换向阀连接块内的三通流量调节阀，使得来自液压泵的液压油从另一多路换向阀连接块内的三通流量调节阀返回液压油箱，因此，如果提前关闭两个多路换向阀连接块内的三通流量调节阀，则无论来自哪个液压泵的液压油均不会返回液压油箱，那通过哪个元件关闭三通流量调节阀呢？", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L5", "title": "自救阀与切换原理", "body": "此时我们应注意到，托架多路换向阀和支腿多路换向阀的M口各串联一自救阀，如果将该自救阀打开，则在接通取力器时，来自液压泵的液压油便将三通流量调节阀关闭。\n\n因此，在实施切换时，还需打开自救阀。", "format": "image-text", "imageUrl": 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"id": "TASK-VIRTUAL-005-L2", "title": "应急切换是什么", "body": "那什么是应急切换呢？\n\n在装备战场抢救抢修中，切换是一种应急修理方式，其是指通过回路转换或改接，脱开损伤部分，接通备用部分，或者将原来担负非基本功能的完好部分改换到基本功能回路中。\n\n针对重型支援桥，应急切换是指在单个液压泵或取力器出现故障时，通过切换到另一个液压泵继续完成架设或撤收作业的方法。", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L3", "title": "双泵供油回路", "body": "重型支援桥是如何实现应急切换的？\n\n我们从原理上来寻找答案，根据液压系统原理，重型支援桥设置有2个供油回路，一个是前泵供油回路，由前泵提供动力，主要负责为托架液压系统和架设架液压系统提供动力，主要由液压油箱、前泵、前泵出油滤油器、托架多路换向阀连接块内的三通流量调节阀、回油滤油器等构成完整的液压回路；另一个是后泵供油回路，由后泵提供动力，主要负责为支腿液压系统和吊机液压系统提供动力，主要由液压油箱、后泵、后泵出油滤油器、支腿多路换向阀连接块内的三通流量调节阀、回油滤油器等构成完整的液压回路。", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L4", "title": "打开球阀后的回油问题", "body": "此时，我们应该注意到在两个出油滤油器的出口处设置一球阀，在正常情况下，该球阀处于关闭状态。\n\n那如果将该球阀打开，会出现什么样的情况呢？\n\n此处以托架马达向前为例说明，当操作手操作托架马达向前时，来自负载侧的压力会将托架多路换向阀连接块内的三通流量调节阀关闭，此时来自前泵的液压油无法通过托架多路换向阀连接块内的三通流量调节阀返回液压油箱，应通过托架多路换向阀内部通道进入托架马达换向联，而后进入液压马达，推动液压马达旋转。\n\n但此时液压马达侧负载压力较大，液压油便不会进入液压马达，而是经打开的球阀，进入支腿多路换向阀连接块内，通过支腿多路换向阀内的三通流量调节阀返回液压油箱。\n\n操作托架液压系统和架设架液压系统的任一执行机构时，均会出现上述现象。同理可分析，操作支腿液压系统和吊机液压系统的任一执行机构时，也会出现上述现象。\n\n那在前泵损坏的情况下，可否利用液压系统这一设计理念，完成重型支援桥的架设和撤收作业呢？\n\n通过上述分析，操作重型支援桥任一执行机构时，负载侧压力总会关闭相应的多路换向阀连接块内的三通流量调节阀，使得来自液压泵的液压油从另一多路换向阀连接块内的三通流量调节阀返回液压油箱，因此，如果提前关闭两个多路换向阀连接块内的三通流量调节阀，则无论来自哪个液压泵的液压油均不会返回液压油箱，那通过哪个元件关闭三通流量调节阀呢？", "format": "image-text", "imageUrl": "/models/bridge-training/bridge-pump-switch-v2.jpg", "videoUrl": "", "imageAssetCode": "", "videoAssetCode": "", "source": "TASK-VIRTUAL-005 图片解说词" }, { "id": "TASK-VIRTUAL-005-L5", "title": "自救阀与切换原理", "body": "此时我们应注意到，托架多路换向阀和支腿多路换向阀的M口各串联一自救阀，如果将该自救阀打开，则在接通取力器时，来自液压泵的液压油便将三通流量调节阀关闭。\n\n因此，在实施切换时，还需打开自救阀。", "format": "image-text", "imageUrl": 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