KR101302733B1 - Rudder of vessel and rudder part construction method of vessel - Google Patents

Abstract

The present invention provides a method of casting a rudder block of a vessel outside the dock, positioning and welding the blocks according to a drying schedule in the dock, and transferring the cast rudder block to the dock to transfer the rudder block according to a drying schedule. An inspection passage communicating with the stern portion of the ship and formed along the longitudinal direction from the embodiment including the step of coupling to the stern, and a plurality of access ladders disposed at equal intervals inward along the vertical direction of the inspection passage. The present invention relates to a rudder construction method of a rudder and a rudder part of a ship, which enables mass production while reducing the man-hour in drying a rudder of a ship by providing a rudder of a ship.

Description

RUDDER OF VESSEL AND RUDDER PART CONSTRUCTION METHOD OF VESSEL}

The present invention relates to a rudder of the ship and a rudder construction method of the ship, and more particularly to a rudder of the ship and a rudder construction method of the ship to enable mass production while reducing the man-hour in drying the rudder of the ship. will be.

As is well known, a rudder is used as a means for adjusting the direction of travel of various vessels, and the rudder is used to turn the vertical component of the lift force acting on it when it has an angle of attack in the state of being placed in the flow of water. It is operated on the principle of adjusting the direction of ship by using force.

Among the performances required for the rudder, it is known that it is possible to generate a large lift, that stall can not be achieved even if the angle of attack is large, and that the change of the position of the point of the lift force is small even when the angle of attack is greatly changed have.

The rudder applied to the first ship was a single plate type rudder with a simple structure in which a single plate type key plate was mounted on the stern. However, such a single plate type rudder had a low stall angle at which the rudder effect was lost due to fluid separation at the rear side, And large-scale problems.

Accordingly, various improved rudders have been continuously developed to maximize rudder performance. Examples of the rudder for increasing the lift of the rudder include an accelerated rudder that passes through the gap between the movable portion of the rudder and the fixed portion, A hydro gap rudder for increasing the flow rate of the rudder by increasing the flow rate of the rudder, a beaker rudder for increasing the lift by deforming the cross-sectional camber of the rudder according to the usage state, beca rudder, a rudder equipped with a propeller, and an active rudder, which generates torque even at low speeds.

As a rudder for improving the propulsion efficiency, there are a reaction rudder (reaction rudder) having a shape that reduces the resistance and generates thrust by using the angle of attack of the propeller wake, And a COSTA bulb rudder with a bulb at the position corresponding to the rear of the propeller boss to improve the efficiency.

On the other hand, the fluid behind the propeller (propeller) consists largely of symmetrical bilge vortices generated in the vicinity of the bilge on the right and left sides of the ship and rotating inward and a rotating current rotating along the direction of rotation of the propeller.

Although the bilge vortex and the return current collide with the rudder and are weakened to some extent by the rectifying action of the rudder, the bilge vortex and the return current remain in the flow after the rear end of the rudder, It is known that the propulsion efficiency of the ship can be further improved if the rearward flow is changed.

On the other hand, such a rudder is largely divided into a rudder horn portion and a rudder movable part, and the rudder horn is fixed to the rear of the screw, so that the fluid flow generated from the screw causes gap cavitation at the pintle portion connecting the rudder horn and the rudder movable part. Zones are formed.

Generally, one of the most abrasion caused by cavitation in the hull is the rudder, which is mounted on the rear of the ship as described above and serves to steer the direction of the propulsive force obtained by the closely installed screw.

The rudder is axially coupled to the rear end of the ship so that the rudder can be pivoted at a constant angle.

The rotation of the screw, which is rotated by the engine inside the vessel, causes the fluid to flow backward and the vessel to move forward by obtaining propulsion force as a reaction of fluid movement.

This propulsion is steered by the rudder located close to the rear of the propeller so that the ship is moving in the desired direction.

That is, the ship obtains the propulsive force by the rotation of the screw, and at this time, the ship can steer in a desired direction by steering the action direction of the propulsive force by the axial rotation of the rudder.

Conventionally, since the ship generally operated at a low speed of 20 knots or less, there was almost no problem of erosion caused by cavitation, and it was not necessary to take special measures against cavitation erosion because the degree was negligibly small.

However, as the machine performance of the ship improves, it is increasingly operated at high speed. As a result, the cavitation due to the rotation of the screw is also generated relatively more in the rudder.

Therefore, erosion due to cavitation in screw and rudder has become a serious problem.

Screws that are directly eroded by double cavitation are provided with coating methods for anti-erosion properties.

However, there is no specific erosion plan for rudder.

Conventionally, in order to prevent gap cavitation of a rudder frequently appearing on a high speed line of 20 knots or more, such as an LNG carrier, a container ship, etc., conventionally, a sectional shape of the rudder has been changed or a small hump is provided in the rudder gap inner rudder body portion, There has been an attempt to suppress the flow, but the effect has been questioned, and it has tended to promote cavitation inside the gap.

In order to dry a large ship from the above viewpoint, the hull blocks manufactured in the ordinary yard are transferred into the dock, and then the blocks are mounted by welding in the planned order, followed by welding and drying.

On the other hand, the ship should be configured in a streamlined bottom portion of the draft line to minimize resistance, the stern portion is to be rotatably coupled to the rudder horn (rudder horn) should be equipped with a rudder (rudder) for controlling the direction of the vessel.

In particular, since the rudder mounted on the rudder horn is a member whose shape is unusual than other blocks and has a direct influence on the determination of the direction in which the ship operates, in the manufacture of the rudder block, the center portion of the hull is small in curvature and has a relatively simple shape. More work is needed than blocks.

Specifically, the rudder block requires a lot of work such as manufacturing a curved surface having a streamlined shape as a whole, welding the internal members, inspecting the mounting and welding conditions, and the like.

In addition, the rudder block is difficult to work because it requires 180-degree rotation for assembly during the movement of the block due to its structural specificity, even in the case of transporting the manufactured bow block and the stern block to the dock and welding it to the dry hull. There is a problem that takes a lot.

In particular, the rudder block is a portion that is pivotally supported by the rudder horn to adjust the direction when the ship is sailing, as described above, the rudder block has a structure similar to a streamline wing.

Therefore, in order to fabricate a rudder block by welding the steel plate in the yard, the steel plate must be bent and welded to each other in the designed form, and thus there is a problem in that a lot of labor is required.

In addition, in the construction of the same designed ship, there is a disadvantage in that it is not possible to reduce the labor required to manufacture the rudder block because the rudder block of each ship must be manufactured separately.

Patent Publication No. 10-2002-0090053 Patent Publication No. 10-2011-0024548 Patent No. 10-0432814 Patent Registration No. 10-0346513 Patent Registration No. 10-0346512

The present invention has been invented to improve the above problems, to provide a rudder of the ship and a rudder drying method of the ship to enable mass production while reducing the man-hour in drying the rudder of the ship.

According to an aspect of the present invention,

Casting the rudder block of the ship outside the dock;

Positioning and welding the blocks in the dock according to a drying schedule,

Transferring the cast rudder block to the dock can provide a rudder drying method of the ship comprising the step of coupling to the stern of the ship according to the drying schedule.

The method may further include manufacturing a core die forming a check passage in which an access ladder is disposed in the rudder block along the longitudinal direction, and casting the rudder block into a mold.

At this time, the step of welding and transporting the lug to the rudder block of the cast ship, and

And removing the lug after joining to the stern.

The rudder horn block is welded to the stern of the ship, and the rudder horn block of the ship manufactured by casting is combined.

On the other hand,

An inspection passage communicating with the stern portion of the ship and formed along the vertical direction;

Of course, it is also possible to provide a rudder of a ship comprising a; a plurality of access ladders disposed at equal intervals inward along the vertical direction of the inspection passage.

According to the present invention having the above-described configuration, the following effects can be achieved.

First, the rudder drying method of the ship according to the present invention by manufacturing a rudder block of a complex and unusual shape by a mold method and then transported to combine with the stern of the hull during drying, thereby reducing the man-hour according to the manufacture of the rudder block As a result, not only can the ship's dry air be shortened, but the ship's dry air is shortened, so that the utilization of the dock is also increased.

And, the rudder drying method of the ship according to the present invention by manufacturing the rudder blocks according to the spinal cord through the mold when the ship is designed in the same way, not only can reduce the drying air, but also can reduce the cost There is this.

In addition, the rudder of the ship according to the present invention is provided with a check passage and an access ladder, and when an abnormality occurs, the worker may approach directly and actively cope with the operation.

1 is a conceptual diagram showing a rudder drying method of a ship according to an embodiment of the present invention
Figure 2 is a perspective conceptual view showing the rudder of the ship according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation and specific terms defined in consideration of the configuration and operation of the present invention may be used in accordance with the intention or custom of the user or the operator And the definitions of these terms should be based on the content of this specification.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text.

That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the disclosed technology should be understood to include equivalents capable of realizing technical ideas.

Also, the purpose or effect of the disclosed technology should not be construed as being limited thereby, as it does not mean that a particular embodiment must include all such effects or merely include such effects.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms.

For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between.

On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between.

On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosed technology belongs, unless otherwise defined.

Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

1 is a conceptual diagram showing a rudder drying method of a ship according to an embodiment of the present invention, Figure 2 is a perspective conceptual view showing a rudder of a ship according to an embodiment of the present invention.

As shown in Fig. 1, in order to dry the ship, firstly, the space in the dock 1 is secured, and the bumps 5 are installed at the bottom of the dock 1 in place.

Then, the blocks 101 manufactured in the yard are transferred to the cranes 7, placed on the bobbin 5, and welded.

On the other hand, in order to cast the rudder block 110, a mold 120 is manufactured in a yard or another region, and molten steel is injected into a hot water hole of the mold 120 to cast the rudder block 110.

Here, a core die (not shown) forming a check passage 112 in which the access ladder 113 is disposed along the vertical direction in the rudder block 110 is manufactured and put into the mold 120. It would be more desirable to cast the rudder block 110.

Here, the pattern used to make the space like the shape of the casting by squeezing the casting mold put into the mold is usually made of wood, metal, plastic and wax, and their choice is the size of the casting , Precision, quantity and casting method.

Because the model is used repeatedly, it can be worn to change the shape and size, and it is an important criterion in choosing the economics model in model material, model making, model making using the model.

The mold injected into the mold shrinks in the solid state after solidification and solidification. The casting must be machined to meet the dimensional and precision according to the designers' instructions. Therefore, the model should show shrinkage allowance (shrinkage allowance) ) And the machining allowance (machining allowance).

The core is a mold to be inserted into the cavity of the casting mold in order to place the cavity in the casting, taking into account strength, heat resistance, and shrinkage.

When the core is small, only the core yarn is made to be compacted. However, when the core is large, the core is inserted into the core when the strength is required.

When using a chaplet to prevent movement or deformation of the core due to the buoyancy of the core or the weight of the core when the core is installed on the mold, it is preferable to use a core support of the same material as the casting.

In this case, the molds to be injected into the mold are used for making molds mainly composed of sand, clay, and water. In addition, coal and coke powder are added to increase the moldability, And gives the molds a porous property.

The addition of sawdust, shag (hair), and rice straw is helpful for the porosity of the mold.

Also, when molasses, oil and fat and man-made resin are mixed, the strength and permeability of the mold are increased.

The choice of principal criminals depends on the casting material, the size of the castings, the shape of the castings, the degree of casting, the mechanical properties of the castings, etc. However, It should have good strength, good ventilation, good shrinkage from the casting surface, suitable particle size, low thermal conductivity and warmth, easy aging, And should be cheap.

Here, the natural sand is close to the round shape, and the artificial sand is mechanically shattered, so there are many square shapes.

The annular type has a large fluidity, a good filling property, a good casting surface and a small surface area, so that moisture and viscosity are minimized. However, when the binder is sufficiently used, the strength of the mold is large because the square shape has a large surface area.

In addition, when the molten metal is injected into the mold, unless the gas coming out of the molten metal, the gas due to water evaporation of the mold, the air in the space of the mold, etc. are sufficiently removed, these gases occupy a part of the mold space. In this case, voids are not filled and voids remain in the void, leaving a defect in the casting.

Thus, the mold must have a degree of air permeability sufficient to allow gas and air to pass therethrough.

In addition, molds must be well shaken in casting without melting, softening, or firing.

Iron oxide, magnesia and the like among the main detectors reduce the fire resistance and become slag when they come into contact with the molten metal.

This is because, when the carbonate is interposed, it decomposes to become a fine powder, which lowers the air permeability.

Thereafter, at the time of mounting the rudder block 110 of the ship according to the construction schedule, the cast rudder block 110 is transferred into the dock 1 by the crane 7.

Here, the lug 111 is welded and fixed to the cast rudder block 110 to transport the rudder block 110, and the rudder block 110 is docked by using the lug 111. Transfer to.

At this time, the rudder horn block 110 'is welded to the stern of the ship, and the rudder horn block 110 of the ship manufactured by casting the rudder horn is rotatably coupled.

Then, the lug 111 fixed to the rudder block 110 is removed, and other blocks are mounted according to a drying schedule to dry the hull 100.

In the skewer drying method, when the ships having the same structure are manufactured in large quantities, the rudder horn blocks 110 can be continuously manufactured in conformity with the spinal water of the ship to be dried through the manufactured mold 120.

Therefore, in the present invention of manufacturing and drying the rudder block 110, it can be more preferably used when drying a large number of ships of the same structure.

When explaining the shape of the rudder block produced by the drying method as described above with reference to FIG.

First, the rudder block includes a rudder body 110 that is generally streamlined and communicates with the stern of the ship and has a check passage 112 formed along a vertical length direction.

For reference, in FIG. 2, reference numerals of the rudder horn main body and reference numerals of the rudder part block are used as the same 110.

The inspection passage 112 is a technical means for allowing an operator to approach and check for an abnormality and, in case of emergency, to enable active troubleshooting and countermeasures even if the ship is in operation.

A plurality of accessing ladders 113 are disposed at the equal intervals on the inside of the check passage 112 along the up-and-down direction to improve the accessibility of the operator.

As described above, it can be seen that the present invention has a basic technical idea to provide a rudder construction method of a rudder and a rudder part of a ship to enable mass production while reducing the man-hour in drying a rudder of a ship.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Accordingly, the true scope of the present invention should be determined by the following claims.

1 ... dock
5 ... antagonism
7 ... crane
100 ... hull
101 ... block
110 rudder block, rudder body
112 ... check passage
113 ... access ladder
120 ... mold

Claims (5)

Manufacturing a core die which forms an inspection passage in which an access ladder is arranged along the vertical direction of the rudder block, and casting the core die into a mold to cast the rudder block outside the dock;
Positioning and welding the blocks in the dock according to a drying schedule,
The rudder part drying method of the ship comprising the step of transporting the cast rudder block to the dock coupled to the stern of the ship according to the drying schedule.
delete The method according to claim 1,
Welding and transporting the lug to the rudder block of the cast ship,
Rudder drying method of the ship further comprising the step of removing the lug after coupling to the stern.
The method according to claim 1,
A rudder horn construction method for welding a rudder horn block to a stern of a ship, and coupling a rudder horn block of a ship manufactured by casting to the rudder horn.
An inspection passage communicating with the stern portion of the ship and formed along the vertical direction; And
It includes a plurality of access ladders arranged at equal intervals on the inside along the vertical length direction of the inspection passage,
A rudder of a ship, wherein the core die forming the inspection passage is cast into a mold.

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