Telescopic arm excavator is one of the main mechanical equipment in construction machinery, which is widely used in road construction, housing construction, water conservancy construction and other fields. Today we will explain the practical significance of load spectrum test of telescopic excavator for your reference.

　　伸缩臂挖掘机的工作载荷复杂多变，在交变载荷的作用下，各关键构件容易产生疲劳失效。实际工程中，疲劳破坏的发生占全部力学破坏情况的50～90，是机械、结构失效常见的形式之一

　　The working load of telescopic boom excavator is complex and changeable. Under the action of alternating load, fatigue failure of key components is easy to occur. In practical engineering, the occurrence of fatigue failure accounts for 50-90% of all mechanical failure, which is one of the common forms of mechanical and structural failure.

　　日本对中型液压伸缩臂挖掘机故障情况调查统计的结果是，金属材料故障占总故障的35%，而工作装置故障约占金属材料故障的60(包括疲劳、脆性、磨损及变形)。由此可见，结构件的疲劳是影响产品使用可靠性的关键问题之一。为了深入认识疲劳失效并研究技巧的耐久性与可靠性，需要为机器关键零部件工作装置载荷谱的采集和室内疲劳可靠性试验提供典型工况，即在试验过程中模拟并再现实际工况下的载荷，并在该工况下测定载荷数据信息，工况包括作业类型、作业介质等。因此，开展伸缩臂挖掘机主要作业介质及所占比例和主要作业类型及所占比例的调查研究工作，对载荷谱试验及载荷谱整理关重要。

　　According to the investigation and statistics of the faults of medium-sized hydraulic telescopic boom excavators in Japan, the metal material faults account for 35% of the total faults, while the working device faults account for about 60% of the metal material faults (including fatigue, brittleness, wear and deformation). Thus, the fatigue of structural parts is one of the key issues affecting the reliability of products. In order to deeply understand fatigue failure and study the durability and reliability of techniques, it is necessary to provide typical working conditions for the collection of load spectra of key parts of machines and the indoor fatigue reliability test, that is, to simulate and reproduce the loads under actual working conditions during the test process, and to measure the load data information under such conditions, including the type of operation, working medium, etc. Therefore, it is very important for load spectrum test and load spectrum arrangement to carry out investigation and Research on the main working medium and proportion, main working types and proportion of telescopic boom excavator.

　　依据载荷谱试验的实际需求通过对伸缩臂挖掘机主要作业介质及所占比例、主要作业类型及所占比例等关键问题进行了调查统计和分析，分别获得大型和中型伸缩臂挖掘机的主要作业介质和每种介质所占比例；同时获得伸缩臂挖掘机主要作业类型及所占比例，为载荷谱试验的开展和数据整理提供了依据，具有重要实践意义。

　　According to the actual demand of load spectrum test, the main working medium and its proportion, main working type and proportion of telescopic boom excavator are investigated and analyzed, and the main working medium and the proportion of each medium of large and medium telescopic boom excavator are obtained respectively. At the same time, the main working type and proportion of telescopic boom excavator are obtained as load. The development of charge spectrum test and data collation provide a basis and have important practical significance.