Excavator Hydraulic Oil Pump Structure

Excavator hydraulic oil pump structure diagram and hydraulic working principle? Hydraulic excavators are mainly composed of engine, hydraulic system, working device, traveling device and electrical control. The hydraulic system consists of hydraulic pump, control valve, hydraulic cylinder, hydraulic motor, pipeline, fuel tank, etc. The electrical control system includes monitoring panel, engine control system, pump control system, various sensors, solenoid valves, etc.

Hydraulic excavators are generally composed of three parts: working device, slewing device and traveling device. According to its structure and use, it can be divided into: crawler type, tire type, walking type, full hydraulic, semi-hydraulic, full rotation, non-full rotation, general type, special type, articulated type, telescopic boom type and other types.

The working device is the device that directly completes the excavation task. It is hinged by three parts: boom, stick and bucket. Boom lift, stick extension and bucket rotation are controlled by reciprocating double-acting hydraulic cylinder. In order to meet the needs of various construction operations, hydraulic excavators can be equipped with a variety of working devices, such as digging, lifting, loading, leveling, clamps, bulldozers, impact hammers and other work tools.

The slewing and traveling device is the body of the 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 which use diesel oil in a convenient place, and can also use an electric motor instead.

The hydraulic transmission system transmits the power of the engine to the hydraulic motor, hydraulic cylinder and other actuators through the hydraulic pump, and pushes the working device to move, thereby completing various operations. Take the PV-200 hydraulic excavator, which is widely used in construction sites, as an example. The machine uses an improved Open Center Load Sensing System (OLSS). The system uses the method of controlling the swash plate angle (output flow) of the swash plate variable piston pump to reduce the power output of the engine, thereby reducing the fuel consumption. It is an energy-saving system.

The characteristics of this hydraulic system are: constant torque control, which can maintain the driving torque of the hydraulic pump unchanged, load-break control, which can reduce the unloading loss during operation time; oil quantity control, which can reduce the hydraulic pump during neutral and fine-tuning control. Output flow, reduce power loss.