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挖掘机作为一种重要的土石方工程机械，在工程建设、矿山开采、抢险救援等领域发挥着不可替代的作用，以下是对挖掘机的详细介绍：
一、基本定义与功能
定义：挖掘机，又称挖掘机械或挖土机，是用铲斗挖掘高于或低于承机面的物料，并装入运输车辆或卸至堆料场的土方机械。
功能：挖掘机具有破碎、装卸、起重、打桩等多种功能，是土石方工程中的主要机械设备之一，被誉为“工程机械之王”。在工程中，挖掘机的工作量约占60%~75%。
二、主要类型
按行走方式分类：
履带式挖掘机：具有良好的稳定性和通过性，适用于各种复杂地形，如泥泞山路、沙土地面等。是工地上常见的“大家伙”，常用于土方开挖、矿区开采、地下作业等。
轮式挖掘机：机动性强，适合在城市道路和短距离转移中使用，不会破坏城市道路。常用于城市建设、小型工地等。
迷你挖掘机：体积小、操作灵活，适用于狭小空间和精细作业，如园林绿化、室内拆除等。
水陆两栖挖掘机：加装了浮筒系统，可在浅水区域和湿地施工，如河道清淤、湿地开发、水利工程等。
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