hose reel

Detailed explanation of underwater dredging robot pipe rolling technology

I. Overview

Underwater dredging robots are the core equipment for cleaning silt in rivers, ports, reservoirs, and other water bodies, and the pipe reel, as its key subsystem, is responsible for the management of power cables, hydraulic pipelines, or mud conveying hoses. Its design needs to balance reliability, corrosion resistance, and dynamic adaptability, which directly affects the operational efficiency and safety of the robot.

2、 Core structure and working principle

1. Mechanical structure

-Drum component: Made of high-strength stainless steel or titanium alloy material, with a diameter designed according to the bending radius of the pipeline (usually ≥ 15 times the pipe diameter), and built-in spiral guide grooves to ensure layered winding.

-Drive system: servo motor+planetary gearbox combination, torque can reach 2000Nm, equipped with electromagnetic brake to achieve emergency locking. Some deep-sea models are driven by hydraulic motors.

-Guidance mechanism: Three degree of freedom robotic arm type guide, equipped with laser ranging sensor for real-time correction of cable position, with deviation error controlled within ± 3mm.

2. Intelligent control system

-Adopting PLC+encoder closed-loop control, the winding speed is continuously adjustable from 0.1-2m/s, and the tension control accuracy is ± 5%. Integrating AI algorithms to predict cable fatigue and automatically optimize deployment strategies.

3. Special design

-The deepwater pipe reel is equipped with a pressure compensation oil tank to balance the 10MPa hydrostatic pressure at a depth of 200m. The cable joint adopts a double sealing structure with an IP68 protection level.

3、 Technological breakthrough

1. Composite winding technology: The carbon fiber drum developed by JAMSTEC in Japan in 2023 reduces weight by 40% while increasing load-bearing capacity to 3 tons.

2. Dynamic tension control: IHC's adaptive hydraulic system in the Netherlands can absorb instantaneous impact loads caused by waves, reducing tension fluctuations by 70%.

3. Modular design: The Chinese "Jiaolong" series adopts a quick change drum, which can switch between the mud pipe and cable drum within 15 minutes.

4、 Comparison of application scenarios

|Scene type | Cable specifications | Technical points | Representative equipment|

|Urban River Management | DN150 Polyethylene Mud Pipeline | Anti entanglement Design+GPS Trajectory Synchronization | German REINERT Dredging Robot|

|Deep sea mining | Armored composite cable+hydraulic pipe | 3000m tensile strength+fiber optic real-time monitoring | Oceaneering ROV system from the United States|

|Nuclear power plant condensation pool | Radiation shielding cable | Fully enclosed coiling+decontamination and flushing device | French EDF customized robot|

5、 Maintenance and troubleshooting

-Daily maintenance: Bearing lubrication (using seawater grade grease) and cable insulation resistance testing (≥ 100M Ω) are required every 50 working hours.

-Typical faults:

-Cable stacking: Due to calibration failure of the guide, the laser sensor needs to be recalibrated.

-Abnormal tension: commonly seen in pressure compensation valve blockage, requiring disassembly and cleaning of the filter screen.

6、 Selection suggestions

It is necessary to comprehensively consider parameters such as water depth (shallow/deep water), sediment characteristics (sand content/viscosity), and operation duration. For example, when dealing with highly abrasive sludge, a pipe roller with wear-resistant lining should be selected and equipped with dual backup drive motors.