Overview
The fixed excavation arm is a critical attachment for excavators, designed to perform heavy-duty digging and lifting tasks in construction, mining, and demolition. Unlike articulated arms, it lacks rotational flexibility but offers superior strength for vertical operations. Its rigid design ensures minimal energy loss during force transmission, making it ideal for repetitive, high-impact tasks. Manufacturers often customize arms based on machine compatibility (e.g., hydraulic pressure ratings) and job requirements (e.g., reach depth). Common variants include standard, long-reach, and heavy-duty models, each optimized for specific terrains or materials like rock or clay.
Structure and Working Principle
The arm comprises three primary segments: the boom, stick, and bucket linkage, all welded from steel plates for structural integrity. Hydraulic cylinders power the arm’s movement, converting fluid pressure into linear force. The fixed design eliminates pivot points found in rotating arms, reducing maintenance but limiting flexibility. Key stress points are reinforced with gussets or thicker steel, while abrasion-prone areas (e.g., bucket joints) may have replaceable wear pads. Advanced models integrate pressure sensors to monitor load distribution and prevent overextension, enhancing safety and longevity.
Key Features
Durability is paramount, with high-tensile steels (e.g., Hardox 450) resisting deformation under loads up to 10 tons. Anti-corrosion treatments like shot blasting and epoxy coatings protect against rust in wet environments. Some arms feature pre-drilled holes for auxiliary attachments (e.g., breakers or grapples). Ergonomic designs reduce operator fatigue by optimizing weight distribution, while standardized mounting systems (e.g., ISO 13031-compliant pins) ensure compatibility across major excavator brands like Caterpillar and Komatsu.
Application Areas
Fixed arms dominate tasks requiring brute force over precision, such as quarrying, trenching, or handling bulk materials. In mining, they load blasted rock onto trucks, while in urban demolition, their rigidity allows controlled breaking of concrete structures. Specialized variants include dredging arms with extended reach for riverbed excavation and forestry arms equipped with protective grilles to shield against debris. Their versatility makes them indispensable in industries prioritizing efficiency over maneuverability.
Maintenance and Precautions
Routine inspections should focus on weld integrity, hydraulic hose leaks, and pin wear. Lubricate pivot points weekly with high-pressure grease to prevent seizing. Replace cracked bushings promptly to avoid catastrophic failure. Operators must adhere to load charts to prevent overstress, especially when handling dense materials like basalt. Avoid sideloading, which can bend the stick. Storage in dry conditions and periodic paint touch-ups extend service life.
B2B Procurement Guide
When sourcing fixed arms, verify compatibility with your excavator’s model and hydraulic flow rate (e.g., 30–50 GPM). Request material certifications (e.g., EN 10025-2) and warranty terms (typically 1–2 years). Bulk orders (10+ units) may secure 5–15% discounts. Reputable suppliers provide CAD drawings for custom designs and third-party load testing reports. Consider total cost of ownership: cheaper arms may lack wear-resistant features, increasing long-term replacement costs. Shipping oversized arms often requires specialized logistics.
Related Manufacturers
- 主营：船吊、叉车吊、蜘蛛吊车、固定式挖臂破碎头、随车抓木机、高空作业车、蓝牌随车吊、折臂吊、随车挖、履带蜘蛛吊、吊挖一体机、三轮随车吊、履带随车吊、三轮吊、履带随车挖、履带吊车、船用起重机、拖拉机平板吊、履带随车抓、下葬车、四不像吊车、车载吊机、抓木机、拖拉机吊钻一体机、小吊车、装载机
- 主营：船吊、履带蜘蛛吊、叉车吊、固定挖臂、随车抓木机、车载吊机、三轮随车吊、折臂吊、履带随车吊、随车挖、吊挖一体机、三轮吊车、履带随车抓、三轮下葬车、高空作业车、拖拉机吊钻一体机、克令吊、拖拉机平板吊、吊抓一体机、履带运输车、四驱龙门吊下葬车、装载机抓木机、履带吊、蓝牌随车吊、撬毛台车
- 主营：船吊、蓝牌随车吊、履带吊、伸缩式固定挖臂、蜘蛛吊、叉车吊、折臂吊、车载吊机、挖臂、随车抓、高空作业车、随车挖、三轮下葬车、吊挖一体机、履带随车吊、履带蜘蛛吊、三轮随车吊、三轮吊车、克令吊、四驱龙门吊、履带随车挖、装载机抓木机、光伏打桩机、抓木机、船用起重机、吊钻一体机
- 主营：船吊、克令吊、随车吊、蜘蛛吊车、抓臂、挖机臂、车载吊机、光伏打桩机
- 主营：起重机、蜘蛛吊、越野叉车、固定式、折叠吊机、叉吊一体机、车载液压吊臂、一体机叉车吊、液压伸缩起重臂
- 主营：滚筒夯、扫地车、短管置换设备、破碎锤、锚索切割机、破冰机、液压剪、等离子切割机、劈裂机、岩石锯、板换夹紧器、焊网机、顶管机、皮带取样机、生物质燃烧机、喷砂机、激光除锈机、制氮机、装载机扫路车、马路吹风机、铣挖机、污水处理设备、洗车机、截桩机、轨道运输车
- 主营：龙门吊殡葬车、运输车、挖树机、遥控割草机、抱夹锯、随车吊、汽车吊、蜘蛛吊、船吊、克令吊、6吨船用吊机、升降平台、沥青搅拌机、三轮随车吊、折臂吊、光伏打桩机、机械臂、随车挖、车载吊机、沥青洒布机、高空作业车、25吨船吊、全自动伐木机、四不像运输车
- 主营：全自动伐木机、抱夹锯、蜘蛛吊、固定抓臂挖臂、船吊、叉车尾吊、三轮随车吊、吊车、折臂吊、随车吊、高空作业车、3吨蜘蛛吊、5吨蜘蛛吊、光伏打桩机、四不像运输车、龙门吊下葬车、沥青搅拌机、朝天锅搅拌机、沥青洒布机、随车挖、吊挖一体机、轨道吊、车载吊机、遥控割草机、挖树机
- 主营：地基打桩机、光伏打桩机、升降平台、高空作业车、船吊、克令吊、车载吊机、三轮随车吊、折臂吊、沥青洒布机、四不像运输车、履带运输车、遥控割草机、抱夹锯、三角履带、液压挖树机、自动伐木机、自动伐树机、蜘蛛吊车、蜘蛛起重机、船用起重机、甲板吊、船用吊机、履带吊、随车吊改装
- 主营：高空作业车、沥青搅拌机、四不像、固定式起重机、固定吊机、随车挖、全自动伐木机、遥控割草机、挖树机、船吊、克令吊、蜘蛛吊、随车吊、汽车吊、折臂吊、车载吊机、光伏打桩机、3吨蜘蛛吊、5吨蜘蛛起重机、8吨蜘蛛起重机、12吨蜘蛛、随车起重机、随车吊改装、三轮随车吊、船用起重机
- 主营：船吊、隧道锚杆钻机、平板吊、固定抓臂、固定折臂吊、固定吊、三轮吊车、随车吊、履带吊、护坡钻机、直臂吊、旋转船、起重机、折臂吊、蜘蛛吊车、遥控割草机、自制吊、光伏打桩机、拖拉机吊钻一体机、潜孔钻机、甲板吊、越野式叉车尾吊、铲车吊、钻孔机、四不像随车吊
- 主营：抱夹锯、全自动伐木机、遥控割草机、挖树机、船吊、克令吊、随车吊、吊车、汽车吊、车载吊机、升降平台、四不像、随车挖、蜘蛛起重机、履带拉伸机、螺旋打桩机、光伏打桩机、皮带拉伸机、沥青洒布机、运输车、沥青搅拌机、高空作业车、三轮随车吊、蜘蛛吊、折臂吊
- 主营：蜘蛛吊、8吨蜘蛛吊、克令吊、船用吊机、遥控割草机、抱夹锯、吊车、随车吊、汽车吊、三轮吊、沥青搅拌机、履带罐车、高空作业车、剪叉式升降平台、随车挖、光伏打桩机、16米升降平台、沥青洒布机、轨道吊机、全自动伐木机、挖树机、船吊、5吨蜘蛛吊、1.2吨蜘蛛吊
- 主营：汽车吊、随车吊、折臂吊、船吊、三轮随车吊、沥青搅拌机、全自动伐木机、遥控割草机、挖树机、四不像运输车、蜘蛛吊车、车载吊机、光伏打桩机、螺旋打桩机、蜘蛛起重机、叉车尾吊、随车挖、抱夹锯、履带运输车、沥青洒布机、升降平台、高空作业车、蜘蛛吊、轨道吊、吊车
- 主营：蓝牌随车吊、高空作业车、船吊、固定挖臂抓臂、蜘蛛吊、履带吊车、随车挖、随车抓、折臂吊、叉车吊、挖臂、三轮随车吊、车载吊机、吊挖一体机、三轮吊车、抓木机、履带随车吊、拖拉机平板吊、下葬车、四驱龙门吊、装载机、吊钻一体机、履带随车挖、吊篮、履带运输车、履带蜘蛛吊