Analysis of Core Technical Characteristics of Hydraulic Excavators for Coal Mines（haoyun）

The editor of Shandong Haoyun Heavy Industry Machinery Co., Ltd. will provide the following introduction on the core technical characteristics of hydraulic excavators used in coal mines. In order to adapt to the special working conditions underground, hydraulic excavators used in coal mines have significant differences in technical characteristics compared to ordinary engineering excavators, mainly reflected in structural design, optimization of working principles, and targeted selection of key technical parameters.

1. Specialized structural composition

The structure of hydraulic excavators used in coal mines mainly includes working equipment, rotary platform, power system, hydraulic system, walking mechanism, and cab. Haoyun Heavy Industry considers factors such as limited underground space and the risk of gas and dust explosions in coal mines, and its structural design has the following characteristics:

Compact design: The overall size, especially the height and width, are strictly limited to accommodate the size of the tunnel.

Explosion proof performance: The power system, electrical components, hydraulic components, etc. must meet the corresponding explosion-proof standards.

Specialized working device: In addition to the standard bucket, it may be equipped with a breaking hammer, milling head, etc.

2. Efficient hydraulic working principle

The core working principle of hydraulic excavators used in coal mines is to convert the mechanical energy output by the power system into hydraulic energy through hydraulic pumps, and then distribute it to various actuating components (hydraulic cylinders, hydraulic motors) through control valves to drive the working device to complete excavation, rotation, and walking actions.

Hydraulic excavators used in coal mines usually adopt load sensitive variable displacement pump systems or electro-hydraulic proportional control systems, which can automatically adjust flow and pressure according to actual load requirements, achieve high efficiency and low energy consumption operation, and improve the accuracy of control.

Explosion proof motors provide power for hydraulic pumps. High pressure hydraulic oil is distributed through precision multi way valves, and is precisely controlled by the commands of the operating handle (usually pilot control or electro-hydraulic proportional control) to extend and retract the boom, arm, bucket cylinder, as well as the operation of the swing motor and walking motor. Waste oil is returned to the oil tank through the return filter, forming a closed circuit.

3. Safety and Efficiency: The Core of Modern Mining

The hydraulic excavator used in coal mines achieves a balance between safety and efficiency through its unique technical characteristics. Haoyun Heavy Industry’s efficiency is reflected in its strong excavation power, fast operation cycle, and the ability to achieve multi functionality of one machine by replacing different attachments. Accurate hydraulic control also reduces disturbance to the surrounding rock, which is beneficial for tunnel stability.

Safety is the primary consideration for coal mining equipment. In addition to the explosion-proof design and sturdy cab mentioned above, modern coal mine hydraulic excavators may also be equipped with advanced safety functions such as automatic power-off when gas exceeds the limit, remote control operation, and environmental monitoring linkage, to maximize the safety of underground personnel and equipment.

In summary, hydraulic excavators used in coal mines have become a key technological equipment for promoting the development of coal mining towards safer and more efficient directions, thanks to their precise structure and efficient working principles.