SU1025582A1 - Towed ice-sweeping accessory - Google Patents

Abstract

A TOWED WEDDING STATION, comprising a hull, on the bottom of which there is an ice-spreading wedge and ice-cutting knives, and the angle of attack of the hull bottom is 5-8 °, in order to reduce power consumption for towing and increase utilization it is provided with vertical guides located in the forward part of the hull, the draft of the attachment is 0.15-0.35 of its width, and the ice-cutting knives are located in the aft end of the hull.

Description

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00 N5 The invention relates to shipbuilding, in particular to towed ice-cleaning consoles. The known ice-towed towed attachment is contained in the housing, on the bottom of which there is an ice outlet, a wedge and ice-cutting knives are installed, while the bottom attack angle of the hull is 5-8 ° 1. However, towing such an ice-cleaning attachment requires considerable energy, and its use ineffective. The purpose of the invention is to reduce the energy consumption for towing an ice-cleaning attachment and increase the efficiency of its use. The goal is achieved by towing an ice-cleaning set-top box containing a hull, on the bottom of which an ice-wedge is located and ice-cutting knives are installed, while the angle of attack of the hull bottom is 5-8 °, provided with vertical guides located in the bow parts of the hull, the set-up of the attachment is 0.15-0.35 of its width, and the ice-cutting knives are located in the aft end of the hull. FIG. 1 schematically shows an ice-cleaning attachment, side view; in fig. 2 - view from the side of the bottom of the console; in fig. 3 is a section A-A in FIG. 2; in fig. 4 is a section BB in FIG. 2. Towing. The ice-cleaning attachment includes a housing 1 with an ice spreading wedge 3 located on its bottom 2, designed to remove broken ice under the channel edges during the movement of the attachment behind the icebreaker. The guides of the movement of broken ice on the surface of the attachment include the bottoms of the 4 nasal guides, the bottom 2 of the hull and the working surface 5 of the ice spreading wedge 3. The guides 4 attach the nasal tip of the C-shaped attachment in plan. At the same time, they are the beams on which coupling devices, attachments, and fairings are placed to direct the ice broken by the icebreaker under the bottom of the attachment. Ice-cutting knives 6 are provided on the bottom of the body of the console in the aft tip. The bottom 2 is made with an angle of attack of 5-8 ° to the plane of the waterline. This angle is established experimentally on the basis of tests of models of the console. The optimum angle of attack of the working bottom of the console, in the zone of action of the propeller of the icebreaker, taking into account the limitation of its size, is 7 °. The front working surface of the ice-breaking wedge 3 has a curvilinear shape in plan, the radius of which decreases as it approaches the sides, for example, a part of the arc of the ellipse, the major axis of which is located outside the edge of the attachment. The height of the wedge, greatest at the bow, decreases towards the stern. The bottom surface of the wedge is located below the axis of the icebreaker propellers, but not deeper than its draft. The set-up of the set-top box depends on the draft of the tree, as well as on the depth of the axis of its propellers. The draft should be such that the broken ice being thrown by the icebreaker’s screws is not directed by the flow of water below the bottom, but by the ice point of the wedge of its wedge, which, like the set-top box, respectively, must be buried below the axis of the propellers. The depth of the propeller axis, as shown by analysis of sea, port, and river icebreakers, is about 0.6 of their draft. The width of the channel laid by the icebreaker is 1.15-1.20 of the width of the icebreaker at the waterline, therefore the width of the console must be equal to or greater than it, i.e. Vln (12 1.25) V, where is the width of the console; B - the width of the icebreaker at the waterline. The set-up draft is in the following dependence on its width: for sea icebreakers 0, 35 V, u, for port icebreakers 0,, 28 Bjjfjfl; for river icebreakers 0, 18 V..DPL. These limits take into account the above requirements for deepening the bottom of the ice-breaking wedge of the attachment below the axis of the icebreaker propellers, but less than its draft. Ice cleaning console works as follows. The attachment coupled to the icebreaker moves in the channel laid by the icebreaker, directly behind its stern in the ice-flooding zone flowing around the icebreaker hull and moving along its sides. Using the guides 4, the bottom 2 and the working surfaces 5 of the ice-breaking wedge 3, the broken ice is directed under the edges of the undisturbed ice cover. Maneuvers when laying the channel include the movement of an icebreaker with a prefix backwards both along the laid channel and in pristine ice. In the latter case, the knives 6 ensure the destruction of ice. At the same time, the icebreaker propulsion and steering complex operates in less dangerous conditions. The use of the invention allows to reduce the cost of ice cleaning in comparison with the prototype by 24%.

Claims (1)

A TOWED ICE CLEANER containing a hull, on the bottom of which there is an ice-raising wedge and ice-cutting knives are installed, while the angle of attack of the hull bottom is 5-8 °, characterized in that, in order to reduce energy costs for towing and increase the efficiency of use, it is equipped with vertical guides located in the bow of the hull, the prefix draft is 0.15-0.35 of its width, and ice-cutting knives are located in the aft end of the hull.