https://www.xyexcavator.com/excavator/wheel-excavator/grapple-wheeled-excavator.htmlThe boom of backhoe excavator is an extremely key component, which is of great significance to the normal operation of excavator. This article will explain the arrangement of boom cylinder and boom angle of backhoe excavator.
1. arrangement of boom cylinder
The boom cylinder is connected with the fuselage and boom and is the power element for lifting the whole working device and materials. Most small and medium-sized excavators, mainly backhoes, adopt the lower boom cylinder design, that is, the boom cylinder is located at the front and lower part of the boom.
The lower hinge point of the boom cylinder is placed on the flange at the front of the turntable and is lower than the lower hinge point of the boom in the vertical direction. The upper hinge point of the boom cylinder of the medium excavator is placed on both sides of the middle of the boom, while the upper hinge point of the boom cylinder of the small excavator is placed on the lower plate in the middle of the boom. The reasonable arrangement of the boom cylinder is of great significance to ensure the normal exertion of the excavator's digging force and the smooth progress of the digging process.
2. boom angle
The boom angle of small excavators on the market will be relatively small, but it looks much more bent than that of medium-sized excavators. This is because small excavators use a single boom hydraulic cylinder. And the position of the cylinder hinge point is different from the boom cylinder arrangement of the medium-sized excavator. In order to increase the excavation depth of the boom, the boom angle is reduced.
According to the data of relevant literature, the value range of boom bending angle is generally 110 ° ~140 °. Within the range of these values, a small bending angle is conducive to increasing the excavation depth, but will reduce the maximum excavation height, and is unfavorable to the structural strength, because the bending part will cause stress concentration due to the structure and welding process. The smaller the bending angle, the more serious the stress concentration, and the greater the possibility of cracking at the bending part of the boom during the use of the machine.
To sum up, the integral curved boom of backhoe excavator has the advantages of simple structure, light weight and high stiffness, which can make the excavator have a large excavation depth. It is the most widely used structural form at present. Its disadvantage is that there are few replaceable working devices and poor universality. It is mostly used on excavators with similar long-term operating conditions.
