SU112241A1 - Device for cleaning the outer surface of the underwater part of the ship's hull - Google Patents

Description

Devices for cleaning the outer surface of the underwater part of the ship hull by electrolysis are known. However, these known devices are complex and they do not provide for the cleaning of the ship hull afloat.

The proposed device, also intended for electrolytic cleaning of the ship hull, does not have this disadvantage. It is made in the form of two parallel rafts, to which the ends are connected to a series of electrodes in the form of metal strips bent according to the cross-sectional shape of the underwater part of the hull of the vessel, which can be cleaned between rafts.

FIG. 1 shows a cross-section of the device in the working position; in fig. 2-perspective view of the device with the vessel brought into it.

The rafts are made of two bolted logs or bars 9 on top of which wooden flooring 8 is laid. On top of the flooring are metal squares 5 with openings for fastening electrodes in the form of metal strips 10 that can be equipped with stiffeners 12. On the other longitudinal side of the raft there is a guard rail 6. There are several such helots along the vessel, depending on the length of the latter. The bands are curved in the cross-sectional shape of the underwater part of the hull //. Copper contacts are welded to the squares. In order to be able to adjust the position of the strips in height, depending on the draft of the vessel, several openings are located at the vertical ends of the strips.

A low voltage source / direct current (converter or rectifier) is installed on the deck of the vessel to be cleaned, and copper contacts 3 are welded to the deck of this vessel.

The ship hull is cleaned as follows.

No. 112241

By setting lanes 10 to the required position, depending on the draft of the vessel, the vessel 11 between the heights and heel inclining to the berth is set. The distance between the legs and the hull of the vessel is controlled by the spacer bars 7. Then it is connected with an electric cable 4 plus the source to the strips 10, and its minus cable 2 is connected to the contacts 3 of the deck of the vessel. After that, a current source is switched on, which will flow along the circuit from the anode through the electrolyte (sea water) to the cathode (ship hull).

As a result of the passage of current on the cathode (on the vessel's hull) hydrogen will be released, which, between the metal surface of the hull shell and the metal, found rust on it, old paint and fouling (sea grass, shells), will expand, It will crush and repel rust, paint, etc. from the surface.

At the clearing of the surface (underwater part) of the vessel hull a white limescale of magnesium and calcium salts appears, easily removed from the noMonibro metal scrapers and a stream of water from the fire hose with a pressure of 4-5 atm.

The thickness of this lime scale depends on the current density per square meter of water, which is the surface.

After removing limescale from the surface being cleaned (along with residues of rust, old paint and fouling), the casing will have a clean metal surface.

The proposed device is simple in construction, ensures the cleaning of the ship hull afloat and high cleaning quality.

Subject invention

A device for cleaning the outer surface of the underwater part of the ship hull by electrolysis method, characterized in that, to clean the hull afloat, it is made in the form of two parallel rafts to which a series of electrodes are attached to the ends in the form of metal strips bent in transverse form A section of the underwater hull of the ship, made for cleaning between rafts.

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