1.伸缩臂是安装在挖掘机上的一种工作装置，其中固定体和移动体通过伸缩油缸伸缩移动体，以达到较大的挖掘半径和合理的装载高度。这种工作装置被称为伸缩臂。有滑动伸缩臂、伸缩臂等。它的优点是能使挖掘机有效工作，通过手臂的变幅可以达到更高的工作高度，这是传统挖掘机无法比拟的。
1. The telescopic boom is a working device installed on the excavator, in which the fixed body and the moving body expand the moving body through the telescopic oil cylinder to achieve a large excavation radius and reasonable loading height. This working device is called telescopic arm. There are sliding telescopic boom, telescopic boom, etc. Its advantage is that it can make the excavator work effectively and reach a higher working height through the amplitude variation of the arm, which is unmatched by the traditional excavator.
2.伸缩臂是安装在挖掘机上的一种工作装置，通过伸缩油缸的作用使移动体伸缩，从而达到较大的挖掘半径和合理的装载高度。挖掘机配备伸缩臂后，工程应用范围广，机械工作量小，节省车辆和燃油。随着普通挖掘机数量的增加和恶性竞争，车辆租赁成本降低，就业越来越困难。由于车辆数量少，竞争力低，伸缩臂的车辆租赁费增加了一倍多。低成本且效益高。随着时代的进步，施工要求越来越高，伸缩臂具有广阔的发展前景。
2. The telescopic boom is a working device installed on the excavator, which makes the moving body telescopic through the action of the telescopic oil cylinder, so as to achieve a large excavation radius and reasonable loading height. After the excavator is equipped with telescopic boom, it has a wide range of engineering applications, small mechanical workload and saves vehicles and fuel. With the increase of the number of ordinary excavators and vicious competition, the cost of vehicle rental is reduced, and employment is becoming more and more difficult. Due to the small number of vehicles and low competitiveness, the vehicle rental fee of the telescopic boom has more than doubled. Low cost and high efficiency. With the progress of the times, the construction requirements are higher and higher, and the telescopic boom has broad development prospects.

三：挖掘机伸缩臂是安装在挖掘机大臂上的专用工作装置;用于灵活扩大其作业半径和垂直深挖范围。按其结构外观可分为：外扩、内扩;外膨胀是通过膨胀气缸和滑块的作用，使移动体在固定体的上方随意伸缩。内扩是指移动体套入固定体，通过伸缩缸的伸缩使移动体伸缩，使挖掘机具有更大的工作半径。
3： The telescopic boom of excavator is a special working device installed on the boom of excavator; It is used to flexibly expand its operation radius and vertical deep excavation range. According to its structure and appearance, it can be divided into: external expansion and internal expansion; External expansion is to make the moving body expand and contract freely above the fixed body through the action of expansion cylinder and sliding block. Internal expansion means that the moving body is sleeved into the fixed body, and the moving body is expanded and retracted through the expansion and contraction of the expansion cylinder, so that the excavator has a larger working radius.
其它不可以的管理 其他不可以包含发动机机油、机油、齿轮油等；不一样牌号和不一样级别的不可以不可以混且；不一样种类挖掘机不可以在生产过程中添加的起化学作用或物理功效的添加剂不一样；要保证不可以清理，避免杂物（水、烟尘、颗粒物等）渗入；根据温度和主要用途选用油的型号。温度高，应选用黏度大的机油，温度低应选用黏度小的不可以；齿轮油的黏度相对比较大，以融入比较大的传动系统负载，机油的黏度相对较小，以降低液态流动阻力。
Other management that cannot include engine oil, engine oil, gear oil, etc; Different brands and grades cannot be mixed; Different kinds of excavators cannot be added with different chemical or physical additives in the production process; Ensure that it cannot be cleaned and avoid the infiltration of sundries (water, smoke, particulate matter, etc.); The model of oil shall be selected according to the temperature and main purpose. If the temperature is high, the engine oil with high viscosity shall be selected, and if the temperature is low, the engine oil with low viscosity shall not be selected; The viscosity of gear oil is relatively large to integrate into the relatively large transmission system load, and the viscosity of engine oil is relatively small to reduce the liquid flow resistance.
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