We have all seen excavators, which are common machines in our construction operations. I believe everyone has heard of the telescopic arm of an excavator. Do you know the principle of telescopic boom of excavator? I believe many people also want to understand the principle of telescopic boom. Today, let Jinan Tongda excavator company answer this question for us.

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 stretch the moving body through the telescopic oil cylinder to achieve a larger excavation radius and a reasonable loading height. This working device is called a telescopic boom. There are sliding telescopic boom, telescopic boom, etc. Its advantage is that it can make the excavator work. It can reach a higher working height through the amplitude change 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 larger excavation radius and a 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 benefit. With the progress of the times, the construction requirements are getting 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 structural 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. Inner expansion means that the mobile body is sleeved into the fixed body, and the mobile body is expanded and retracted through the expansion and contraction of the expansion cylinder, so that the excavator has a larger working radius.

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