Because the price of the original excavator's elongated arm is too high for many bosses to bear, so the rental of the elongated arm excavator has become a popular form at present. The elongated arm excavator can exert tremendous power under the condition of the elongated arm excavator limited by the ground environment such as dredging, revetment, slope and subway construction by using the super-long arm and super-long bucket rod.

　　当前全国各地纷纷地铁建设，为保护环境而进行的河道疏浚治污等工程也是遍地开花，因此华体会国际 的市场需求很大。华体会国际 将在这个生机勃勃的细分市场占据自己独特的一席之地。

　　At present, metro construction has been carried out in various parts of the country, and river dredging and pollution control projects for environmental protection are also being carried out everywhere, so the market demand for long arm excavators is very large. Extended arm excavators will occupy a unique position in this vibrant sub-market.

　　新机不建议改装，因为改装成华体会国际 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;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，好的是5-8成新的挖掘机改装成华体会国际 。

　　The new machine is not recommended to be refitted, because the load of the excavator increases after being refitted into an elongated arm excavator, moreover, it is easy to cause disputes with the original factory about after-sales service without expiration of the warranty period; nor is the machine below 50% new, because the service life of the machine is relatively old, the performance of all aspects is reduced, and the elongated arm itself has a certain weight, so it is difficult to give full play to the efficiency of the elongated arm excavator. Best of all, 5-8% of new excavators are converted into long arm excavators.

　　两段式加长臂制造工艺：两段式加长臂一般采用Q345B通用高强度钢板制造，设计、模拟工作、排版下料、铣边成型、拼装焊接、管路清洗、质检等工艺流程。也有企业选择Q550D或者Q690D等材料制造，根据宗健机械多年的制造经验，非超大型挖掘机或者极限恶劣工况，Q345B材料足够够满足施工要求。

　　Two-stage elongated arm manufacturing process: two-stage elongated arm is generally made of Q345B universal high strength steel plate, design, simulation, layout and blanking, milling forming, assembly and welding, pipeline cleaning, quality inspection and other processes. Others choose materials such as Q550D or Q690D. According to Zongjian's years of manufacturing experience, Q345B material is enough to meet construction requirements for non-super excavators or extreme bad working conditions.

　　两段式加长臂改装基本配置:20-25吨位挖掘机加长臂，可加长到16米，其配置为：挖斗1个、铲斗油缸1支、销轴6支、高压软管4条、黄油管3条、连杆总成1套、运输连杆1套、加长大臂（8.5.米）、加长小臂（7.5米）。其他部件使用原机。

　　The basic configuration of two-stage elongated arm refitting: 20-25 tonnage excavator elongated arm, which can be extended to 16 meters. Its configuration is: excavator 1, bucket cylinder 1, pin 6, high-pressure hose 4, butter pipe 3, connecting rod assembly 1 set, transport connecting rod 1 set, elongated arm (8.5 meters), elongated arm (7.5 meters). Other parts use the original machine.