1.两段式加长臂：使用范围相对较大，但是他的主要功能也即是为了提升挖掘半径，在清理河道，填海造地，地铁出入口开挖，人行地底隧道，还有高速公路防护墙修整，一般住宅输送一下水泥等等。也有人用他前置破碎锤作用于房屋拆迁的，不过比较危险。两段式加长臂一般10-26米区间改装比较多。
1. Two-stage lengthening arm: the scope of use is relatively large, but its main function is also to improve the excavation radius, in order to clear the river, fill the sea to make land, excavate the subway entrance and exit, the pedestrian underground tunnel, and the repair of the highway protective wall, and the general residential transport of cement. Some people use his front crushing hammer to act on house demolition, but it is dangerous. Generally, there are many modifications in the 10-26m section of the two-stage extension arm.
2.三段式加长臂：或者多段式加长臂，主要应用于高层建筑的拆迁，前置破碎锤或者液压钳。20-28米内使用者比较多。
2. Three-segment lengthening arm: or multi-section lengthening arm, mainly used for demolition of high-rise buildings, with front breaking hammer or hydraulic tongs. There are many users within 20-28 meters.
3.滑臂或者内伸缩臂：主要为了回转半径很小，但是挖掘深度要求很高的工况设计，一般会前置贝壳挖斗（贝形斗）。滑臂垂直挖掘深度一般为10米，内伸缩臂垂直挖掘深度一般在26米以内。
3. Sliding arm or inner telescopic arm: It is mainly designed for working conditions with small turning radius but high excavation depth requirements. Generally, the shell bucket (shell bucket) is fronted. The maximum vertical excavation depth of the sliding arm is generally 10 meters, and the vertical excavation depth of the inner telescopic arm is generally within 26 meters.
4.打桩机加长臂：大小臂平直，前置弯臂2.6米左右（主要是为了与振动锤连接是便与阀块和管路的安装）及震动锤，应用于修建公路铁路或者埋设管道的时候打拔钢板桩。
4. Extending arm of pile driver: the large and small arms are straight, the front bending arm is about 2.6 meters (mainly for connecting with the vibration hammer to facilitate the installation of valve blocks and pipelines) and the vibration hammer, which is used to drive and pull steel sheet piles when building roads and railways or burying pipelines.
5.抓木机、抓料机装卸煤机加长臂：更多的时候为了装卸火车或者汽车而设计，一般大臂7.6米，小臂5-6米.前置抓木器、抓钳器或者贝壳挖斗。
5. Wood grabber, material grabber, coal loader and extension arm: more often designed for loading and unloading trains or cars. Generally, the large arm is 7.6 meters, and the small arm is 5-6 meters. The front wood grabber, gripper or shell bucket.
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