Hydraulic rotary cranes are highly efficient and flexible heavy-duty lifting equipment widely used in construction, transportation, mining, and other fields. They primarily use hydraulic systems to lift, rotate, and move heavy objects, offering multiple functions to meet operational needs in various complex environments.

Hydraulic rotary cranes are mainly composed of the following parts:

1. Main structure: Includes the chassis, crane arm, and turret, bearing the weight of the entire equipment and the load.
2. Hydraulic system: Provides power and controls the crane's various movements.
3. Control system: Includes joysticks and a control system for remote operation.

Main features:

1. High efficiency: Hydraulic drive, quick response, and precise movements.
2. Flexibility: Can rotate, lift, and move, adapting to various working environments.
3. Stability: Equipped with multiple stabilizing devices to ensure operational safety.
4. Intelligence: Equipped with an advanced control system for remote operation and automated operation.

The length of the crane arm of a hydraulic rotary crane can be adjusted according to operational needs. Generally, it is achieved through telescopic or variable-boom methods to meet different lifting requirements. The specific length can be adjusted according to the equipment model and manufacturer's settings.

Hydraulic rotary cranes are widely used in the following fields:

1. Construction industry: Used for lifting and handling building materials and components.
2. Transportation: Used for lifting bridges and road facilities.
3. Mining: Used for the extraction and transportation of mineral resources.
4. Emergency rescue: Used for disaster relief and material handling at disaster sites.

Precautions:

1. Check the equipment status before operation to ensure safety.
2. Follow operating procedures during operation to avoid misoperation.
3. Regularly inspect and maintain to ensure equipment performance.
4. When operating in complex environments, take appropriate measures to ensure operational safety.

Hydraulic rotary cranes are highly efficient, flexible, and stable heavy-duty lifting equipment with multiple functions to meet operational needs in various complex environments. In practical applications, attention should be paid to safe operation and regular maintenance to ensure normal operation and operational safety.