The excavator of a certain brand is equipped with a 6-cylinder common rail EFI engine. The hydraulic system is a closed center of gravity load sensing system (CLSS). Clss is an energy-saving system to reduce power by controlling the swash plate angle of swash plate variable piston pump. It is composed of main pump, main operating valve and various working elements. It can realize the following functions:
1. Realize the variable control of the main pump, make the hydraulic system absorb power and engine output power to achieve the best match, realize energy saving.
2. It can realize the precise control that the handling performance is not affected by the load, and even in the precise control, it can also realize the stable operation of the excavator.
3. In load operation, it has the compound operation performance that the flow distribution performance is determined by the opening area of the slide valve.
The circuit of rotary hydraulic system consists of main pump, pump confluence / shunt valve, main control valve, walking motor and oil tank. By driving the slewing mechanism with high-speed hydraulic motor, the excavator can complete 360 degrees of freedom at any position ° It can rotate and stop at any position.
The rotary mechanism has the functions of motor driving, inertia braking, parking braking, left and right rotation, etc. The rotary motor relies on the pilot pressure oil from the pressure reducing valve to control the rotary brake valve to realize whether to brake or not. The slewing hydraulic motor assembly consists of hydraulic motor, parking brake and brake valve assembly.
