The boom of backhoe excavator is an extremely key component, which is of great significance to the normal operation of excavator. What kind of structure does the backhoe excavator boom have, and what kind of function does it determine? This article will explain this.
For general backhoe hydraulic excavators, no matter how heavy the machine is and how large the operation size is, they mainly excavate below the ground. Therefore, in order to meet the maximum excavation depth, the boom is usually made into a downward bending shape. The boom is hinged with the slewing platform and the stick through the pin shaft and is one of the main components of the backhoe working device.
The integral bending boom is the main form of the backhoe excavator boom. The downward bending form is mainly used to achieve a larger excavator depth. The boom is composed of two straight upper and lower sections and three bent middle sections. The boom is welded as a whole. In terms of structure, the integral bending boom is a left-right symmetrical closed mid empty box type welded structure. Generally, the hinge joints of the upper and lower ends are steel castings, and the middle three sections are high-strength and high-quality steel plates.
The inner part of the boom, especially the hinge joint with the boom cylinder, is generally welded with rib plates to further strengthen the local strength and ensure that the boom as a whole has high bending and torsional strength.
Due to the bending and machining process, the bending boom has inevitable welding deformation and stress concentration at the bending, so the machining process and strength are very important. In the production process, the ultrasonic flaw detection test is usually used, and the boom without any small cracks will be considered as a qualified product.
In order to meet the requirements of heavy-duty operation, many excavator manufacturers will optimize the design of boom structure. It is worth noting that the long-time installation of crushing hammer and overweight excavation will cause great damage to the boom of the excavator.
