Excavator boom refers to a working device of excavator, usually also called boom and jib, which is mainly used to control the excavation, loading and other actions of the bucket. The arm connected to the frame is long, so it is commonly known as the boom, and its term is called boom; The arms connected to the digging bucket are small, so they are commonly known as small arms, and the term is called stick, so they are commonly known as large arms and small arms. Generally speaking, the shape of the boom of backhoe excavator has a certain bending position, which can better carry out forced excavation for the soil below the parking surface, while the backhoe excavator is generally straight, which can also better carry out forced excavation for the soil above the parking surface zy12. Its structure is generally box-type. The upper and lower parts are cover plates, the side parts are wallboards, the camera frame is connected with the boom seat sleeve, the boom middle sleeve is connected with the boom cylinder rod, the middle cylinder ear is connected with the middle cylinder barrel, and the boom hairpin is connected with the jib.