Quality

The power performance of construction machinery is one of the most important indicators to measure the technical level of the product. It includes two parts: the power performance of the diesel engine itself and the comprehensive performance of the power transmission system of the whole machine. In addition to the continuous improvement of fuel injection systems and common technologies such as fuel consumption reduction and low carbon emissions, construction machinery engines have specific requirements for torque reserve, power output mode, performance matching, vibration, and noise at low speeds.

Hydraulic components are one of the key components of construction machinery products. It can not only reflect the operation efficiency, simplicity, and comfort of the operation of construction machinery products, but also the main source of failure of the whole machine. Combined with the theme of the conference, I will mainly introduce the development status of the excavator supporting the hydraulic parts industry.

Compared with hydraulic cylinders, hydraulic pumps and hydraulic valves have higher technical content.

What are the three major parts of an excavator?

engine, hydraulic pump, distribution valve

The engine provides power for the hydraulic pump, the hydraulic pump, hydraulic oil pipeline, hydraulic motor, hydraulic cylinder, etc. performs hydraulic transmission, and the distribution valve performs hydraulic control

Hydraulic pumps convert mechanical energy into liquid pressure energy. We generally see gear pumps and plunger pumps (for excavators and loaders).

Common large and medium-sized excavators generally combine a plunger pump and a gear pump to form a hydraulic pump assembly. Generally, the main pump is a plunger pump (the output hydraulic oil pressure is relatively high) to supply hydraulic travel motors, hydraulic swing motors, and hydraulic cylinders. Oil; the pilot pump is a gear pump (the output hydraulic oil pressure is small) to supply oil to the distribution valve.