从名字上看，挖掘机伸缩臂也是在挖掘机的基础上安装的一种工作装置，它由移动体和固定体通过伸缩油缸的作用使得移动体伸缩，从而增加或减少挖掘机臂膀的作业半径的或者高度的一种伸缩装置。从挖掘机伸缩臂的定义上不难看出它的装置更加丰富了，能够活动的范围也更加宽广了，拥有挖掘机加长臂和标准臂挖掘机所无法比拟的再延申能力。
From the name, the excavator telescopic arm is also a working device installed on the foundation of the excavator. It is a telescopic device that increases or decreases the operating radius or height of the excavator arm by the action of the movable body and the fixed body through the telescopic oil cylinder. From the definition of the excavator telescopic arm, it is not difficult to see that its devices have become more diverse, and its range of movement has become wider. It has the ability to extend beyond the extended arm of an excavator and the standard arm excavator.
拥有这些特定，我们就很有必要了解下挖掘机伸缩臂的驱动装置类型有哪些，主要分成滑轮式伸缩臂和套入式的伸缩臂。滑轮式伸缩臂的结构比较简单，所以生产成本比较低，而且多半只能制成二段式的；但是套入式的伸缩臂，其结构是一段为固定体，其余的都是移动体，所有的移动体都装在固定体内，这样的好处就不局限二段式，可以往多段式的方向发展。
With these specific features, it is necessary for us to understand the types of driving devices for excavator telescopic arms, mainly divided into pulley type telescopic arms and sleeve type telescopic arms. The structure of the pulley type telescopic arm is relatively simple, so the production cost is relatively low, and most of it can only be made into a two-stage type; However, the structure of a telescopic arm with a sleeve type is that one section is a fixed body, and the rest are moving bodies. All moving bodies are installed in the fixed body, so the benefits are not limited to a two-stage type and can develop towards a multi-stage type.
加长臂是一种为了拓展挖掘机工作范围的根据工况的要求而特殊设计制造的一组挖掘机前端工作装置，其连接部分必须严格符合原有挖掘机的连接尺寸以便于设备的安装使用。 加长臂一般用于楼房拆迁，对于臂本身要求很高，加长臂是挖掘机产品公司锰钢材料制作，经过电脑模拟，数控切割，二氧保护自动焊接，抛丸，高温喷涂等多道工序制作而成。套臂是受近几年挖掘机行业市场不景气的影响，在基础上逐步研发的，一端套在小臂马头上的设备，逃避一段利用小臂码头的两根轴做连接 拆楼臂适用的工况：市政工程，地铁建设，河道清淤，水库清理等一些水利工程等
The extended arm is a set of excavator front-end working devices specially designed and manufactured according to the requirements of the working conditions in order to expand the working range of the excavator. The connection part must strictly comply with the connection size of the original excavator to facilitate the installation and use of the equipment. The extended arm is generally used for building demolition, with high requirements for the arm itself. The extended arm is made of manganese steel material from an excavator product company, and is produced through multiple processes such as computer simulation, CNC cutting, automatic welding with oxygen protection, shot blasting, and high-temperature spraying. The boom is a device gradually developed on the basis of the sluggish market in the excavator industry in recent years. One end is attached to the head of the small arm horse, avoiding the working conditions applicable to the demolition arm using the two shafts of the small arm dock for connection: municipal engineering, subway construction, river dredging, reservoir cleaning, and other water conservancy projects
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