There are several important parts of the excavator
I open the machine, I will tell you: the structure and working principle of hydraulic excavator excavator mainly consists of engine, hydraulic system, working device, driving device and electric control components. The hydraulic system consists of hydraulic pump, control valve, hydraulic cylinder, hydraulic motor, pipeline, fuel tank and so on. The electric control system includes monitoring panel, engine control system, pump control system, all kinds of sensors, solenoid valve, etc.. Hydraulic excavator is usually composed of three parts: working device, slewing gear and walking device (Figure 1).
According to its structure and use, can be classified as: track, tire, walking, full hydraulic, semi hydraulic, full rotation, non full rotation, universal, special type, articulated, telescopic arm and other types. A work device is a device that performs the task of digging directly. The utility model is hinged by three parts, such as an arm, a bucket rod, a bucket, etc.. Boom, landing, bucket expansion and bucket rotation are controlled by reciprocating double acting hydraulic cylinders. In order to meet the needs of various construction operations, hydraulic excavators can be equipped with a variety of working equipment, such as mining, lifting, loading, leveling, clamping, pushing, impact hammer and other operating tools (Figure 2). The rotary and walking device is the body of a hydraulic excavator, and the upper part of the turntable is provided with a power device and a transmission system. The engine is the power source of the hydraulic excavator.
Most of the diesel is used in the convenient site or the motor. The hydraulic transmission system transfers the power of the engine to the hydraulic motor, hydraulic cylinder and other actuating elements through the hydraulic pump, and drives the work device to move, so as to complete various operations. Take PV-200 hydraulic excavator for example. This machine adopts an improved open center load sensing system (OLSS). The system uses the swash plate variable piston pump swashplate angle (output flow) method to reduce the power output of the engine, thereby reducing fuel consumption, is an energy-saving system (see Figure 3). The characteristics of the hydraulic system is to maintain constant torque control, hydraulic pump driving torque constant, carrying off control, can reduce the load loss and unloading operation time; oil control, can reduce the neutral and fine control when the hydraulic pump output flow, reduce power loss.