Novel ship moon pool bottom hatch cover lifting device and method

Abstract

The invention discloses a novel ship moon pool bottom hatch cover lifting device which comprises a lifting winch, a bearing girder, a stable auxiliary mechanism, a connecting joint and a lifting tackle. The lifting winch is installed at the front and back ends of the bearing girder, the stable auxiliary mechanism is arranged at the two sides of the bearing girder and is of an integrated structurewith the bearing girder, the connecting joint is installed on the bearing girder, and the lifting tackle is arranged on the lifting winch. The moon pool device discharging mechanism is temporarily relied on, a bottom hatch cover is opened and closed, the device is simple in technology, safe, reliable, high in operability and adaptability and capable of reducing contamination risk caused by oil leakage to ocean, thereby lowering the ship building and operation cost.

Description

technical field [0001] The invention relates to a novel ship moon pool bottom hatch cover lifting device and lifting method. Background technique [0002] There are huge resources in the marine field. As an important organizational part of marine engineering equipment, marine engineering auxiliary ships provide continuous operation, environmental protection, collaboration, supply and other all-round service guarantees for marine engineering platforms throughout the life cycle of marine engineering. [0003] At present, marine engineering auxiliary engineering ships are often equipped with underwater robots (ROV) or saturated diving bells to meet the necessary prerequisites for underwater operations or deep-water operations. The hatch at the bottom of the pool is opened. Based on previous design experience, the hatch at the bottom of the moon pool is usually designed to open electro-hydraulically. The design is relatively complicated, which makes the design of the surrounding...

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Problems solved by technology

[0003] At present, marine engineering auxiliary engineering ships are often equipped with underwater robots (ROV) or saturated diving bells to meet the necessary prerequisites for underwater operations or deep-water operations. The hatch at the bottom of the pool is opened. Based on previous design experience, the hatch at the bottom of the moon pool is usually designed to open electro-hydraulically. The design is relatively complicated, which makes the design of the surrounding structure at the bottom of the moon pool very cumbersome, and the entire construction cost is very expensive. , since the hatch cover is located below the waterline, its opening and closing operation requires a hydraulic system as power, so the hatch cover and some main hydraulic components will be placed in the moon pool, such as hydraulic cylinders and pipe fittings, etc., when the hatch cover is opened Finally, the hatch cover and its components will be completely immersed in seawater. According to the frequent operation cycle, they will be corroded by seawater for a long time, thereby reducing the service life of the hatch cover system and increasing the risk of oil leakage in the hydraulic system.

[0004] In recent years, with the increasing awareness of marine environmental protection, relevant agencies in various countries have also gradually strengthened their prevention of marine pollution hazards caused by oil leakage. A typical example is the US Environmental Protection Agency promulgated relevant requirements in 2013, to the effect that in US waters It is forbidden to use conventional hydraulic oil and lubricating oil below the draft of the ship to prevent leakage from polluting the sea. As an alternative, biodegradable bio-oil is used. Based on the characteristics of bio-oil, it is harmful to hydraulic equipment to use it in conventional hydraulic systems. It is a huge challenge for manufacturers, and the technology is not yet popularized, and it is mostly studied as a scientific research project

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