柳工QY70起重机的优点有：1. 起重能力强：柳工QY70起重机的最大额定起重量达到70吨，适用于大型项目的吊装作业，能够满足较大规模的起重需求。2. 工作范围广：该起重机的工作范围广，横置臂长度可达52米，最大起重力矩可达2450 kN·m，能够满足不同场地和工程的起重要求。3. 操作灵活方便：柳工QY70起重机采用全液压操作系统，操作简单灵活，具有重复作业、流畅移动等功能，提高了工作效率。4. 稳定性好：起重机具有自动平衡系统，能够保持稳定的工作状态，减少了起重过程中的晃动和风险，提高了施工安全性。5. 外观美观：柳工QY70起重机外观设计精美，造型大气，线条流畅，符合现代工程机械的外观审美标准。6. 维护方便：该起重机的维护保养较为简单方便，主要部件易于更换和维修，减少了停工时间和维修成本。7. 环保节能：柳工QY70起重机采用先进的动力系统和液压系统，具有低噪音、低排放、高效节能的特点，对环境影响较小。总体来说，柳工QY70起重机具有承载能力强、工作范围广、操作方便、稳定性好、维护方便等优点，适用于各种大型工程的起重作业。

The advantages of LiuGong QY70 crane are: 1. strong lifting capacity: the maximum rated lifting capacity of LiuGong QY70 crane reaches 70 tons, which is suitable for lifting operations of large-scale projects, and can meet the lifting needs of a larger scale. 2. wide working range: the crane has a wide range of working range, with a traversing jib length of up to 52 meters, and the maximum lifting torque of up to 2,450 kN-m, which can meet the lifting requirements of different venues and engineering Flexible and convenient operation: LiuGong QY70 crane adopts full hydraulic operating system, which is simple and flexible to operate, and has the functions of repeated operation and smooth movement, which improves the working efficiency.4. Good stability: the crane has an automatic balancing system, which maintains a stable working condition, reduces the shaking and risk during the lifting process, and improves the safety of the construction.5. Beautiful appearance: the appearance design of LiuGong QY70 crane is exquisite, and it can meet the requirements of different sites and projects. 6. QY70 crane appearance is beautifully designed, atmospheric modeling, smooth lines, in line with the aesthetic standards of the appearance of modern construction machinery.6. Convenient Maintenance: the maintenance of the crane is relatively simple and convenient, and the main components are easy to replace and repair, reducing downtime and maintenance costs.7. Environmental Protection and Energy Saving: LiuGong QY70 crane adopts an advanced power system and hydraulic system, which has a low noise, low emissions, high efficiency and energy saving, which has less impact on the environment. Overall, LiuGong QY70 crane has the advantages of strong carrying capacity, wide working range, convenient operation, good stability, easy maintenance and so on, which is suitable for lifting operations of various large-scale projects.