1. Two section lengthening arm: the scope of use is relatively large, but its main function is to improve the excavation radius, such as river cleaning, land reclamation, subway entrance and exit excavation, pedestrian underground tunnel, expressway protective wall repair, general residential transportation of cement, etc. Some people also use his front breaking hammer to act on house demolition, but it is more dangerous. The two-stage lengthening arm is generally refitted in the interval of 10-26m.

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 section lengthening arm: or multi section lengthening arm, which is mainly used for demolition of high-rise buildings, front crushing hammer or hydraulic tong. 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 preceded. The maximum vertical excavation depth of the sliding arm is generally 10m, and the vertical excavation depth of the inner telescopic arm is generally within 26m.

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. Lengthening arm of pile driver: the big and small arms are straight, and the front bending arm is about 2.6m (mainly to connect with the vibrating hammer, which is convenient for the installation of valve block and pipeline) and the vibrating hammer. It is used to drive and pull out 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 grabbing machine, material grabbing machine and coal handling machine lengthening arm: more often, it is designed for loading and unloading trains or cars. Generally, the boom is 7.6m and the jib is 5-6m Front grab, gripper or shell bucket.

挖掘机大小臂改装前提是要考虑动力，液压以及配重平衡几个方面。

The premise of refitting large and small arms of excavator is to consider power, hydraulic pressure and counterweight balance.

什么样的挖掘机可改装成长臂挖掘机

What kind of excavator can be modified into a long arm excavator

新机不建议改装，因为改装成长臂挖掘机以后，挖掘机负荷增大，况且没过保修期容易与原厂产生售后服务的纠纷；

It is not recommended to refit the new machine, because after refitting the long arm excavator, the excavator load increases, and it is easy to have after-sales service disputes with the original factory before the warranty period expires;

五成新以下的机也不建议改装，因为机器使用年限比较旧，各方面性能减退，加上加长臂本身也有一定重量，很难发挥出华体会国际 应有的效率，更好的是5-8成新的挖掘机改装成华体会国际 。

It is not recommended to refit less than 50% of the new excavators, because the service life of the machine is relatively old and the performance of all aspects decreases. In addition, the lengthening arm itself has a certain weight, so it is difficult to give full play to the due efficiency of the lengthening arm excavator. The best thing is to refit 5-80% of the new excavators into the lengthening arm excavator.