KR200485970Y1 - Apparatus for preventing breakage of bottom drain plug - Google Patents

Abstract

More particularly, the present invention relates to a device for preventing damage to a bottom plug using a protection casing enclosing a bottom plug installed at the bottom of a tank when a structural load changes due to a bending moment of a liquid cargo tank and an internal pressure rise, The present invention relates to a device for preventing breakage of a bottom plug in which a rain hole is broken in a process of sinking an overturned or overturned hull due to an accident during operation, thereby preventing the bottom plug from falling off.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bottom-

More particularly, the present invention relates to a bottom plug preventive device for preventing a bottom plug installed on the bottom of a liquid cargo tank from falling off due to the influence of internal pressure and air pressure rise at the time of ship overturning .

Bottom drain plug refers to a hole in a suitable location near the bottom of the tank for discharging residual water from various liquid cargo tanks (fuel tanks, fresh water tanks, ballast tanks, etc.) drain hole (hereinafter referred to as "drain hole"), completely sealed before welding, and sealed with welding or cement.

On the other hand, the above-mentioned installation regulations for the bottom plug are not specifically enforced in the international convention or the Rules for the Classification of Steel Ships, but they are mostly installed by the needs of the shipowner and the need for inspection. In addition, there is no requirement for strength by water pressure or air pressure, but watertightness must be ensured.

This is because, as shown in FIG. 1, in order to prevent the ship s from sinking when the ship is excessively inclined or overturned due to an accident during the ship operation, it is required to secure buoyancy above the weight of the ship. Since the air cushion inside the tank acts as a buoyant element, it is necessary to shut off the discharge of the air.

Based on this technical idea, Korean Patent Laid-Open Publication No. 10-2014-0056638 discloses a plug for a bottom of a ballast tank of a ship which is prevented from dropping out of the plug by improving the workability so as to facilitate the re- However, this is merely focused on structural restoration for the purpose of disassembly and fixation of existing bottom plugs, and structural load due to hydraulic pressure and air pressure due to internal pressure rise of the liquid cargo tank, and bending moment in the inclined and rolled state It does not have enough durability to withstand.

Therefore, the drain hole of the bottom of the tank, which is relatively durable when the ship is sinking due to an accident, may be easily damaged when the internal pressure and the bending moment are applied. When the bottom plug is dropped The air trapped inside the liquid cargo tank is ejected to the outside (the air layer disappears), leading to the problem of accelerating the loss of the buoyancy of the hull.

Korean Patent Laid-Open No. 10-2014-0056638 (Published date: 2014. 05. 12.)

The present invention has been proposed in order to solve the above problems. When the inner pressure of the liquid cargo tank and the bending moment are acted, the load is primarily blocked so as not to act directly on the bottom plug, So as to prevent breakage of the tank bottom drain hole due to internal pressure of the liquid cargo tank and bending moment action and consequent detachment of the bottom plug.

In order to accomplish the above object, the present invention provides a method for preventing internal pressure generated due to inclination or rollover of a hull from directly acting on the bottom plug in a state of being separated from a bottom plug installed in a drain hole of a bottom of a liquid cargo tank of a ship And protruding from the bottom of the liquid cargo tank so as to surround the bottom plug by moving in accordance with a pressure increasing action when the pressure rises excessively; A support drum attached to the bottom of the liquid cargo tank for guiding the movement of the protective casing at the time of pressure rise, together with mounting and assembling of the protective casing; And a plurality of locking members provided on the support drum to prevent separation and separation of the protective casing from the bottom of the liquid cargo tank.

The protection casing has a " C "-shaped structure so as not to interfere with the bottom plug when it is in close contact with the bottom of the tank, and an accommodation space opened in the direction of close contact with the bottom of the tank is provided inside. A plate made of a metal material having rigidity and durability capable of withstanding the rising pressure in the cargo tank and a finish material integrally protruding and attached to the entire one side edge of the plate material.

The support drum includes a flange integrally joined to the bottom of the tank with a periphery around the bottom plug as a center, and an operation space for securing the receiving and mounting range of the protective casing by being assembled successively on the upper side of the flange. And a cylindrical guider having a predetermined height so as to be provided on the inner side.

Wherein a plurality of mounting holes for internally receiving and assembling the locking member are formed in the guider at equal intervals on the upper side in a lateral direction and the locking member is inserted into the mounting hole so as to be partially protruded inside the guider An elastic spring having elasticity for pushing the locking bundle, and a wrench bolt fastened to the mounting hole for supporting the rear end of the elastic spring.

In addition, at least one cut-out portion and an open / close plate are formed on the side surface of the guider so that the inside of the protective casing can be sealed when the hull is inclined or rolled over along with the discharge of residual water (liquid cargo).

At the center of the outer surface of the plate, a recess is formed inwardly for centralizing the working pressure.

The finishing material is made of rubber or urethane material exhibiting stretchability and buffering force in order to alleviate impact and ensure watertightness when adhering to the bottom of the tank.

According to the present invention, the protection casing spaced from the bottom of the tank is primarily blocked so that the load does not directly act on the bottom plug when the internal pressure of the liquid cargo tank rises due to the bending moment due to the change of the behavior of the ship in case of an accident, The protection casing is wrapped around the bottom plug in a state in which the protective casing is in close contact with the bottom of the tank to protect the tank from drainage due to breakage of the drain hole at the bottom of the tank due to pressure rise, can do.

In other words, the air cushion of various liquid cargo tanks formed on the bottom of the ship is one of the factors contributing to the buoyancy to float the hull, and by securing buoyancy of the hull due to the above-mentioned action and effect, It is possible to prevent the sinking of the ship at the time of accident, or to delay it as much as possible, so that the rescue and towing can be facilitated.

1 is an exemplary view schematically showing a rollover state of a ship;
2 is a perspective view showing the external structure of a bottom plug breakage prevention device according to the present invention.
3 is an exploded perspective view showing an assembling relationship of the bottom plug breakage prevention device according to the present invention.
Fig. 4 is a front sectional view showing a constitutional relationship of a device for preventing breakage of a bottom plug according to the present invention; Fig.
5A and 5B are operational sectional views showing an embodiment of a bottom plug breakage prevention device according to the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the constituents of the drawings, it is to be noted that the same constituents are denoted by the same reference numerals as much as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 2 is an exploded perspective view showing an external structure of a bottom plug breakage preventing apparatus according to the present invention, FIG. 3 is an exploded perspective view showing an assembling relationship of a bottom plug breakage preventing apparatus according to the present invention, FIG. 5A and FIG. 5B are operational sectional views showing an embodiment of a bottom plug breakage preventing apparatus according to the present invention. FIG.

As shown in Figs. 2 and 3, the bottom-plug breakage preventing apparatus A according to the present invention is arranged to be spaced apart from a bottom plug provided in a drain hole at the bottom of a liquid cargo tank of a ship, A protective casing (1) which blocks the internal pressure and the bending moment generated by the bottom plug from acting directly on the bottom plug, moves in accordance with the pressure increasing action when the pressure rises excessively, and is brought into close contact with the bottom of the tank so as to surround the bottom plug; In addition to mounting and assembling of the protective casing 1, a support drum 2 is attached to the bottom of the tank for guiding the movement of the protective casing 1 at the time of pressure rise. In order to prevent the protective casing 1 from being separated from the bottom of the tank, And a plurality of locking members (3) provided on the support drum (2).

4, the protective casing 1 is a means for protecting the bottom plug p from pressure and structural load generated in the liquid cargo tank. When the bottom casing b is in close contact with the tank bottom b, A receiving space 1a opened in the direction of close contact with the tank bottom b is provided on the inner side so as not to interfere with the bottom plug p provided in the hole h.

To this end, a metal plate 11 having rigidity and durability capable of withstanding the upward pressure and a metal plate 11, which is integrally protruded and attached all over one side edge of the plate 11 on the side close to the bottom of the tank, And a finishing material 12 which is provided with a receiving space 1a.

A plurality of guide projections 111 for increasing the balance and balance in assembling and moving operations with the support drum 2 are provided on the plate member 11 at regular intervals A receiving groove 111-1 in which a locking member of the locking member 3 can be partially inserted is formed inwardly at a center of a protruding outer surface of each of the guide protrusions 111. [

In addition, a recess 112 for a center concentration of a working pressure is formed inward at the center. In the center of the recess 112, the support drum 2, It is preferable that the first wrench groove 113 capable of binding a separate tool (a hexagonal wrench or the like) used for disassembling a part of the tank bottom from the tank bottom b is further formed inwardly.

The finishing material 12 is preferably made of rubber that exhibits stretchability and buffering power in order to secure watertightness and water tightness when it is brought into close contact with the tank bottom b by a movement action corresponding to a pressure rise, Or a urethane material.

The support drum 2 is means for conveying guidance of the protective casing 1 which is moved toward the bottom of the tank (b) in response to an increase in internal pressure of the liquid cargo tank. As shown in Fig. 4, an action space 2a for accommodating the attachment and movement range of the protective casing 1 is provided on the inner side.

A flange 21 integrally joined to the bottom of the tank b around the bottom plug p and around the flange 21; 2a having a predetermined height so as to be provided on the inner side thereof.

A female screw 211 for threaded fastening of the guider 22 is formed on the inner periphery of the flange 21 and discharges residual liquid (liquid cargo) through the drain hole h. At least one cut-out portion 225 and an open / close plate 226 are formed on the side surface so that the inside of the protective casing 1 can be sealed when the hull is inclined or rolled over.

A threaded portion 221 corresponding to the female threaded portion 211 of the flange 21 is formed on the outer peripheral edge of the lower end portion of the guider 22 and the guide projection 111 of the protective casing 1 is inserted A plurality of guide grooves 222 are formed inwardly along the longitudinal direction at regular inner peripheral equal intervals.

A plurality of mounting holes 223 for internally receiving and assembling the lock member 3 are formed in the upper portion laterally at regular intervals so as to prevent the lock member 3 from being separated from the locking member 3 The step 223-1 is protruded from the inner periphery of the inner tip end portion.

In addition, similarly to the first wrench groove 113, at least one second wrench groove 224, which is also capable of binding a separate tool, is further formed inwardly at the outer periphery.

The locking member 3 is a means for maintaining the binding state of the protective casing 1 to be coupled to the support drum 2 and is provided to the mounting hole 223 for restraint of the protective casing 1 A locking block 31 which is inserted into the receiving groove 111-1 of the guiding protrusion 111 and is inserted into the receiving groove 111-1 of the guide protrusion 111 by being partially protruded inside the guider 22, An elastic spring 32 and a wrench bolt 33 fastened and assembled in the mounting hole 223 to support the rear end of the elastic spring 32.

(G) is a gap (gap, g) formed between the bottom of the tank and the protective casing as the protective casing is spaced from the bottom of the tank by the above-mentioned locking member.

Hereinafter, the operation of the bottom plug breakage preventing device A according to the present invention will be described in detail.

First, the flange 21 of the support drum 2 is first integrally joined to the bottom of the liquid cargo tank in order to install the breakage prevention device A of the present invention. In this case, desirable. The bottom plug (p) provided in the drain hole (h) of the tank bottom (b) is positioned at the center of the flange (21).

Next, a cylindrical guider 22 is further fastened and assembled to the upper side of the flange 21, thereby completing the installation of the support drum 2. It is preferable that each of the lock members 3 is assembled to the mounting hole 223 of the guider 22 before that.

Subsequently, the protective casing 1 is mounted on the support drum 2. Each guide projection 111 protruding from the outer periphery of the plate 11 is guided by guides (not shown) inwardly of the inner periphery of the guider 22, The protective casing 1 can be mounted by being pushed into the grooves 222 while the locking member 3 protruding from the inside of the guider 22 So that the locking block 31 is fitted into the receiving groove 111-1 which is inwardly directed to the outer surface of the guide projection 111. [

Thereby, the locking member 31 is in a restrained state in which the plate 11 is no longer pushed to the tank bottom b side. 5A, it is possible to prevent the protective casing 1 from being mounted and separated from and separated from the protective casing 1 using the locking member 3, and to prevent the gap g between the protective casing 1 and the tank bottom surface b, So that the installation of the breakage prevention device A of the present invention is completed.

Here, the guider 22 is integrally coupled to the flange 21 by a screw-type fastening method, and a separate tool is fastened to the first wrench groove 113 or the second wrench groove 224 So that the maintenance and the docking inspection of the bottom plug p can be done easily.

Hereinafter, an embodiment of the present invention will be described. As described so far, when the ship (s) equipped with the breakage prevention device (A) of the present invention is overturned or overturned due to an accident during operation, the internal pressure of the air layer and the liquid flow inside the liquid cargo tank rises The breakage of the bottom plug p can be prevented by the breakage prevention device A because the bottom plug p can not withstand the upward pressure.

More specifically, when the liquid cargo tank is inverted by the rollover of the ship (ship), as shown in FIG. 5A, the breakage prevention device A of the present invention is also turned upside down along the liquid cargo tank, The opening and closing plate 226 of the damper 225 closes the cut-out portion 225 to seal the inside of the breakage prevention device A. Therefore, even if the bottom plug p is dropped by the bending moment, the breakage prevention device A can prevent the air from being discharged. Further, when a pressure is generated in the liquid cargo tank, the pressure at this time is primarily blocked from acting directly on the protective casing 1.

When the pressure increases excessively, the protective casing 1 can not withstand the force and is pushed toward the tank bottom b. At this time, the guide protrusion 111 of the lock member 3 is pressed against the plate member 11 The protective casing 1 is released from the guide protrusion 111 of the tank casing 1 so that the protective casing 1 is brought into close contact with the tank bottom b as shown in Fig. The movement is done.

Here, the impact that may be generated in the process of sticking the protective casing 1 to the bottom of the tank b by the above-mentioned action can be solved by the buffering action due to the material characteristics of the finishing material 12. In addition, water tightness is added to the close contact portion between the protective casing 1 and the tank bottom (b) by the finishing material 12, so that inflow of the pressure gas is completely blocked.

In summary, according to the present invention, the structural damage caused by excessive inclination or overturning of the hull due to an accident during the operation of the ship and the movement of the internal load of the liquid cargo tank in response to the load And the drain hole h and the bottom plug p are simultaneously covered with the protection casing 1 in the state in which the protective casing 1 is in close contact with the bottom of the tank b so that the drain hole h and the bottom hole p, it is possible to prevent the breakage of the bottom h and the detachment of the bottom plug p thereby preventing the air discharge even when the bottom plug p is removed secondarily and delaying the sinking of the ship to the utmost.

It will be understood by those skilled in the art that various modifications, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

A: breakage prevention device, 1: protective casing, 1a: accommodation space
2: support, 2a: working space, 3: locking member
11: plate material, 12: finish material, 21: flange
22: guider, 31: locking bundle, 32: elastic spring
33: wrench bolt, 111: guide projection, 111-1: receiving groove
112: concave portion, 113: first wrench groove, 211: female thread portion
221: male thread portion, 222: guide groove
223: mounting hole, 223-1: step portion, 224: second wrench groove
225: incision section, 226: opening / closing plate

Claims (8)

The bottom plug installed in the drain hole at the bottom of the liquid cargo tank can be protected from dropping due to the influence of internal pressure and air pressure rise at the time of ship overturn,
The bottom plug breakage prevention device comprises:
Wherein the bottom plug is disposed to be spaced apart from the bottom plug so as to prevent the structural load and the internal pressure caused by the inclination or overturn of the hull from being directly applied to the bottom plug and to move in accordance with an excessive load action, A protective casing adhered to the bottom of the cargo tank;
A support drum attached to the bottom of the liquid cargo tank for guiding the movement of the protective casing at the time of pressure rise, together with mounting and assembling of the protective casing; And
A plurality of locking members provided on the support drum to prevent separation and separation of the protective casing from the bottom of the liquid cargo tank;
/ RTI >
The support drum includes:
A flange integrally joined to the bottom of the liquid cargo tank around the bottom plug at the center,
And a cylindrical guider having a predetermined height so that a working space for securing the receiving and mounting range of the protective casing is provided on the inside when the flange is fastened and assembled on the upper side of the flange,
At least one cut-out portion and an open / close plate are formed on the side surface of the guider so that the inside of the protective casing can be sealed when the hull is inclined or rolled over together with the waste water (liquid cargo)
When the liquid cargo tank is turned upside down, the bottom plug breakage preventing device is also turned upside down along the liquid cargo tank, and the open / close plate blocks the cut-out portion to seal the inside of the bottom plug breakage device, Wherein the bottom plug failure device prevents air from being discharged even if the bottom plug is dropped. The method according to claim 1,
The protective casing has a " C "structure to prevent the bottom plug from interfering with the bottom of the liquid cargo tank when it is in close contact with the bottom of the liquid cargo tank. Bottom plug breakage prevention device featured. delete 3. The method of claim 2,
Wherein the protective casing comprises a plate made of a metal material having rigidity and durability capable of withstanding a rising pressure in the liquid cargo tank,
And a finishing material integrally protruding from one side edge of the plate to provide the receiving space inwardly. delete The method according to claim 1,
Wherein a plurality of mounting holes for internally receiving and assembling the lock member are formed in the guider transversely at equal intervals on the upper side,
The locking member may include a locking pawl inserted into the mounting hole and partially protruding from the inside of the guider, an elastic spring having elasticity for pushing the locking pawl, And a wrench bolt fastened and assembled to the bottom plug. 5. The method of claim 4,
Wherein a recess is formed inwardly at the center of the outer surface of the plate for centralizing the working pressure. 5. The method of claim 4,
Wherein the finishing material is made of rubber or urethane material exhibiting stretchability and buffering power in order to mitigate impact and ensure watertightness at the time of adhering to the bottom of the liquid cargo tank.

Images