Deep sea cable winding and unwinding hydraulic system

Abstract

The invention discloses a deep sea cable winding and unwinding hydraulic system. The deep sea cable winding and unwinding hydraulic system comprises a hydraulic source, a coiling block driving loop, apulley driving loop and a tensioning driving loop, wherein the outlet of the hydraulic source is connected with a main pipeline; the coiling block driving loop is used for controlling and driving a coiling block and is connected with the main pipeline; the pulley driving loop is used for controlling and driving a pulley, is connected with the main pipeline and is arranged together with the coiling block driving loop side by side; and the tensioning driving loop is used for controlling the tensile force of a cable on the pulley, is connected with the main pipeline and is arranged together withthe coiling block driving loop side by side. The hydraulic system can be safely and reliably applied to deep sea, realizes the functions of releasing and recycling a mooring cable and effectively controls the tensile force and the winding and unwinding speed of the mooring cable.

Description

technical field [0001] The invention relates to the technical field of deep sea hydraulics, in particular to a hydraulic system for retracting and releasing deep sea cables. Background technique [0002] Underwater robots have become an important tool for ocean development, especially deep sea development. The existing cable remote control robot ROV (Remotely Operated underwater Vehicle) has the advantages of high power, short control delay, safety and reliability. However, the working water depth of deep-sea ROV is large, and the length of its supporting umbilical cable is very long. Usually, the umbilical cable required for ROV with an operating water depth of 3,500m should reach more than 4,000m, and the umbilical cable for an ROV with an operating water depth of 6,000m even needs to reach 7,000m. In addition, long-distance power transmission in the deep sea will cause a large voltage drop. In order to reduce the voltage drop, the general practice is to thicken the wires...

AI Technical Summary

Problems solved by technology

However, in this method of maintaining a constant tension of the mooring cable by adjusting the overflow pressure of the overflow valve, the overflow valve is always in an overflow state during the operation, resulting in significant heating of the system and large energy consumption

And there is no second set of protection measures, if the hydraulic motor relief valve fails, the maximum tension value of the wire rope cannot be controlled, and there is a risk of the wire rope being broken due to overload

Furthermore, the device has no anti-overspeed function. When the cable is unwound, the drag of the external load will make the reel rotate faster, causing the hydraulic motor to overspeed and suck air, which poses a safety hazard.

In addition, the device is a hydraulic winch suitable only for use on deck and cannot be applied underwater

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