Excavator hydraulic introduction
Excavator hydraulic drives are closely linked and their development is based primarily on the application of hydraulic technology. Its structure is mainly composed of engine, hydraulic system, working device, walking device and electrical control. Due to the harsh working conditions of the excavator, the required action is very complicated, so it puts high requirements on the design of the hydraulic system. Its hydraulic system is also the most complex of engineering machinery hydraulic systems. Therefore, the analysis and design of the hydraulic system of the excavator has become an important part of promoting the excavator. The single bucket hydraulic excavation and extension machine is a mechanical equipment for periodic operation, which consists of a working device, a rotating device and a walking device. The working device includes moving parts, sticks and various changing equipments that can be replaced according to the needs of the work, such as front shovel, back shovel, loading bucket and grab bucket. The typical working cycle is as follows: (1) Excavation in hard earth city Generally, the action of the stick is mainly used, and the cutting angle is adjusted by the bucket cylinder to cooperate with excavation; when digging in the soft soil slope, the bucket cylinder action is dominant; in the excavation action by special requirements, the shovel is made The bucket cylinder, the arm cylinder and the boom cylinder are combined to ensure that the bucket moves according to a specific trajectory. (2) When the full bucket is lifted and the rotary excavation is finished, the bucket cylinder is pushed out, the moving cylinder is raised, and the bucket is lifted; while the swing motor is started, the turntable is turned to the unloading direction. (3) Unloading the turntable to the unloading location. Turning the brake lever cylinder to adjust the discharge radius. The bucket cylinder is retracted and the bucket is unloaded. When the unloading position and height are strictly required, the arm kr is required to cooperate. (4) After the unloading is completed, the turntable rotates in the reverse direction, and the boom cylinder and the arm cylinder cooperate to move the air bucket into the new excavation position. The single bucket hydraulic excavator has a wide range of applications in construction, transportation, water conservancy construction, open pit mining and modern military engineering. It is an indispensable major mechanical equipment in various earth and stone constructions.