KR20140134751A

KR20140134751A - Canister-type thruster

Info

Publication number: KR20140134751A
Application number: KR1020130052937A
Authority: KR
Inventors: 금창환; 박석귀; 최권호; 김지남
Original assignee: 삼성중공업 주식회사
Priority date: 2013-05-10
Filing date: 2013-05-10
Publication date: 2014-11-25
Also published as: KR101475204B1

Abstract

A canister-type thruster is disclosed. According to an embodiment of the present invention, the canister-type thruster comprises: a canister lifting in a trunk of a hull or a floatable structure; holding rods protruding outward from the canister; holding members arranged on the inner surface of the trunk while facing the holding rods; and rod pockets arranged inside the holding members to be rotated.

Description

CANISTER-TYPE THRUSTER {CANISTER-TYPE THRUSTER}

The present invention relates to a canister-type thruster capable of easily securing a canister which is operated to ascend and descend in a trunk to a hull trunk in the operation of a propulsion head.

Special vessels, such as drillships, must be able to berth in the working area of the sea, so a Dynamic Positioning System is needed to maintain its position even under the influence of algae, wind and digging. Therefore, these ships have a thruster that can control the position of the ship by generating propulsion force while changing direction in the water.

However, since the conventional thruster is installed in the lower part of the hull (underwater), there is a problem that it is difficult to repair or replace if a failure occurs. In the event of a breakdown at sea, it may be necessary to move the hull to the land where the dock is located for repair. A canister type thruster is proposed to solve these operational difficulties and to be able to perform repair or replacement work on the thruster in the maritime work area.

Korean Patent Laid-Open Publication No. 10-2011-0139545 (published on December 29, 2011) and Published Patent Application No. 10-2010-0074397 (published on May 07, 2010) each show an example of a canister type thruster . The canister type thruster includes a canister installed to raise and lower in a trunk extending from a deck to a bottom of the hull, a propulsion head installed at a lower portion of the canister and capable of switching the direction of 360 degrees, driving devices for operating the propulsion head in the canister An elevating device for elevating and lowering the canister, and a guide device for guiding the elevation of the canister.

The lift device for lifting and lowering the canister may be configured to include a rack gear provided on a side surface of the canister, and a lifting and lowering drive portion having a pinion gear engaged with the rack gear and a motor for driving the rack gear.

Such a thruster can change the position of the propelling head through lifting and lowering of the canister. It is possible to switch to an operation mode in which the propulsion head is positioned below the hull bottom, a movement mode in which the propulsion head is pulled up into the trunk when the hull is operated, and a maintenance mode in which the propulsion head is pulled up to the maintenance area inside the hull . It is also possible to use a crane or the like to raise the canister and the propelling head together and separate them from the hull.

On the other hand, the canister is difficult to handle because it is a huge structure having a width of about 5 to 6 m in cross section and a height of about 10 m. The weight of the canister and the device mounted thereon is also very large. Therefore, it is very difficult to install the canister into the trunk of the hull or to remove the hull from the hull for repairs. This is because accurate integration of the guide device provided between the canister and the trunk is required at the time of installation, and the bite of the rack gear and the pinion gear of the lift device must be accurately maintained. If the entrance of the canister is deviated during the installation process, the guide device may be deformed or damaged, or a bite impact may occur on the rack gear and the pinion gear of the lift device, which may result in failure of the lift device.

Further, since the canister is independent of the trunk, it is difficult to precisely control the hull unless the canister is fixed in operation of the propulsion head. Conventionally, the canister-type thruster has a protrusion protruding outward from the canister, and a fixing hole through which the protrusion can be inserted is provided in the trunk. In this case, the canister is firmly supported by inserting the protrusion into the fixing hole when the propelling head is operated. It was not easy to precisely control the canister as a structure and insert it into the fixing hole of the trunk.

Korean Patent Laid-Open No. 10-2011-0139545 (Dec. 29, 2011) Korean Patent Publication No. 10-2010-0074397 (published on Jul. 02, 2010)

Embodiments of the present invention provide a canister-type thruster capable of easily securing a canister to a trunk.

The embodiments of the present invention are intended to provide a canister-type thruster capable of easily raising and lowering the canister while being easily manufactured and installed.

According to an aspect of the present invention, there is provided a canister, comprising: a canister that ascends and descends in a trunk of a hull or a floating structure; A latching rod projecting outwardly from the canister; An engaging member provided on the inner surface of the trunk so as to face the engaging rod; And a load pocket rotatably provided inside the engaging member.

The load pocket may include a latching groove for latching the latching rod on a front surface thereof, and an inlet of the latching groove may be larger than a diameter of the latching rod.

The load pocket is provided in a favorable arc shape. The latch member is provided on the inner surface of the trunk and has a hemispherical support groove. The load pocket is provided on the front surface of the support portion, And a fork support portion surrounding the fork support portion.

The support groove includes a stopper hole for restricting rotation of the load pocket, and the load pocket may include a rotation protrusion that rotates in the stopper hole.

According to another aspect of the present invention, there is provided a canister for a ship, comprising: a canister which ascends and descends in a trunk of a hull or a floating structure; A latching rod projecting outwardly from the canister; An engaging member provided on the inner surface of the trunk and provided opposite to the engaging rod; And a rod pocket rotatably provided in the latch member and extending in a region where the latching rod is caught and fixed while being rotated upon entry of the latching member.

And a guide device for guiding the lifting and lowering of the canister.

The lift device may include a rack gear which is installed on the outer surface of the canister in a lengthwise direction of the canister and a lift driving part provided on the trunk and including a pinion gear engaged with the rack gear and a driving source for driving the rack gear.

The guide device includes an upper guide unit installed on an inner surface of the trunk of the upper part of the lifting and lowering part to guide the lifting and lowering of the rack gear, a lower guide unit installed on the inner surface of the trunk of the lower part of the lifting and lowering part, .

Wherein the upper guide unit and the lower guide unit are provided with a support bracket fixed to the inner surface of the trunk, a tooth surface guide provided on the support bracket and in contact with the teeth of the rack gear to guide the lifting and lowering, And a side guide portion for guiding the up and down movement in contact with the side surface of the guide portion.

The canister type thruster according to the embodiment of the present invention includes a rotatable load pocket on a support portion of a trunk in which a locking rod of a canister is inserted so that even if the locking rod does not enter the normal fixing region, It is possible to enlarge the fixable region (enlarged fixed region) of the latching rod.

In the canister type thruster according to the embodiment of the present invention, the stopper holes and the rotation protrusions are provided on the back surface of the support portion and the load pockets, respectively, to restrict rotation of the load pockets, Can be effectively prevented.

The canister type thruster according to the embodiment of the present invention can easily install the guide device and the landing gear on the same line and can simplify the configuration of the guide device, .

1 is a cross-sectional view illustrating an inner structure of a canister type thruster according to an embodiment of the present invention and a hull mounted state thereof.
2 is a perspective view of a canister type thruster according to an embodiment of the present invention.
Figs. 3 to 5 are cross-sectional views taken along line AA of Fig. 1, showing the canister moved to the operating mode, the moving mode, and the maintenance mode, respectively.
FIG. 6 is a cross-sectional view showing a cross-sectional structure of a canister and a trunk of a canister type thruster according to an embodiment of the present invention and a configuration of a restraining device for restricting the canister.
7 is a longitudinal sectional view showing a restraining device of a canister type thruster according to an embodiment of the present invention.
8 and 9 are sectional views for explaining the operation of the restraining device of the canister type thruster according to the embodiment of the present invention.
10 is a front view of a restraining device of a canister type thruster according to an embodiment of the present invention.
11 is a perspective view of a lower guide unit of a canister type thruster according to an embodiment of the present invention.
12 is a front view of a lower guide unit of a canister type thruster according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 shows an internal configuration of a canister type thruster and a hull attachment state according to the present embodiment.

The canister type thruster 100 according to the embodiment of the present invention can be applied to a ship or a floating structure that needs to maintain an anchoring state in a working area in the sea. For example, it can be applied to drillships drilling for oil and gas resources, floating production storage offloading (FPSO), and so on. The canister type thruster 100 can be applied to special ships such as a tugboat, icebreaker, and the like as well as ordinary transportation vessels in addition to the case where position control is required in an anchored state.

Referring to FIGS. 1 and 2, a ship 1 (or a floating structure) of a ship to which a canister type thruster 100 is applied has a trunk 2 penetrating in the vertical direction. The thruster 100 includes a canister 110 installed in the trunk 2 so as to be able to move up and down, a propulsion head 130 installed at a lower portion of the canister 110, a lifting device 140 moving the canister 110 up and down, And a guide device for guiding the lifting and lowering of the canister 110.

1, 2, and 6, the canister 110 may be provided in the form of a rectangular box whose bottom and side surfaces are watertight. The trunk 2 of the hull 1 may be in the form of a rectangular barrel slightly larger than the canister. As an example, the canister 110 and the trunk 2 may have a rectangular cross-sectional shape, but the cross-sectional shape of the canister 110 and the trunk 2 may be variously changed, such as hexagon, octagon, .

As shown in FIG. 1, the canister 110 can be divided into a plurality of spaces by a plurality of decks 112, 113, and 114 spaced apart from each other in the vertical direction. The lower compartment 116 between the bottom plate 111 and the first deck 112 from the lower side of the canister 110, the drive device room 117 between the first deck 112 and the second deck 113, An auxiliary equipment room 118 between the second deck 113 and the third deck 114 and an upper compartment 119 between the third deck 114 and the top plate 115. In addition, a ladder 120 may be installed vertically in the canister 110 so as to move to each space.

A drive motor 121 for driving a propulsion head 130 to be described later is installed in the drive device room 117 and various control equipment and power supply equipment for controlling the operation of the thruster 100 are installed in the auxiliary equipment room 118 Can be installed. Here, as an example, the configuration of the inside of the canister 110 is presented only, and the internal configuration of the canister 110 is not limited to this form. The inside of the canister 110 can be variously changed according to the design.

1 to 3, the propulsion head 130 includes a propeller 131, a streamlined propeller support 132 for supporting the propeller 131, and a propeller support 132 extending upwardly from the propeller support 132, And a cylindrical shroud 135 provided around the propeller 131 for guiding the propulsion water is provided in the vertical support portion 133. The vertical support portion 133 includes a vertical support portion 133 rotatably supported by the bottom plate 111 of the canister 110, can do.

The lower compartment 116 of the canister 110 is provided with a drive shaft 136 for transmitting the rotation of the drive motor 121 to the propeller 131 and a vertical support portion 133 and a propeller support portion 132 , Rotation shafts and gears for connecting the drive shaft 136 and the propeller 131 for power transmission are installed. Steering motors 137 may be installed in the lower compartment 116 to rotate the rotation link 134 to rotate the propulsion head 130 360 degrees.

The propelling head 130 can rotate propeller 131 by the operation of the driving motor 121 in a state where the propelling head 130 is positioned below the bottom surface of the hull 1 as shown in FIGS. In addition, the propulsion head 130 can be rotated by the operation of the steering motors 137 to control the direction of the propulsion water. The propulsion water can move the hull 1 to a desired position so that the hull 1 can maintain its position in the sea despite the influence of algae or waves. The propeller in which the propelling head 130 rotates at the bottom of the hull 1 is also referred to as an azimuth thruster.

The lifting device 140 for moving the canister 110 up and down can be installed between the outer surface of the canister 110 and the inner surface of the trunk 2, as shown in FIGS. Also, elevating devices 140 of the same type may be provided on both sides of the canister 110 so that both sides of the canister 110 can be raised and lowered on the same condition.

Each lifting and lowering device 140 includes a rack gear 141 fixed to the side surface of the canister 110 and extended in the lifting direction and two pinion gears 141 and 142 fixed to the inner surface of the trunk 2, (142), and an elevation driving unit (143) having a driving source for driving these pinion gears (142).

The rack gear 141 is elongated from the upper side to the lower side of the canister 110 as shown in FIGS. 2 and 3, has two pinion gears 142 on both sides in the width direction thereof, and teeth 141b, Are symmetrical. The present embodiment shows a configuration in which two pinion gears 142 engage with both side teeth 141b of the rack gear 141 in order to realize stable lifting and lowering, but the teeth 141b of the rack gear 141, And one pinion gear 142 may be engaged with the pinion gear. The present embodiment shows a state in which the body portion 141a of the rack gear 141 and the teeth 141b on both sides thereof are integrated with each other. However, the rack gear 141 has the body portion 141a and the teeth portion 141b They may be separately manufactured and then combined with each other. Further, since the rack gear 141 is a long and large component for realizing lifting and lowering of the canister 110, which is a huge structure, it may be divided into a plurality of elements,

As shown in Fig. 1, the lifting drive portion 143 can be installed at a position higher than the upper and lower middle portions of the trunk 2, and on both sides of the inner surface of the trunk 2 where the lifting drive portion 143 is located, And an installation space 3 for installation and maintenance of the air conditioner 143 may be provided. The drive source of the lifting drive portion 143 may include a reduction gear device capable of realizing a decelerated rotation of the two pinion gears 142 and a motor for driving the reduction gear device, As shown in FIG.

The raising and lowering device 140 can move up and down the canister 110 by raising and lowering the rack gear 141 by the operation of the raising and lowering driving part 143, The position can be changed. That is, as shown in FIG. 3, an operation mode in which the propulsion head 130 is positioned below the bottom of the hull 1 to perform position control of the hull 1, A driving mode in which the head 130 is pulled up into the trunk 2, a maintenance mode in which the propulsion head 130 is pulled up to the maintenance position on the upper part of the trunk 2 for maintenance of the propulsion head 130, Mode.

5, a maintenance space 6 for maintenance of the propulsion head 130 may be provided on the side of the trunk 2 at a height where the propulsion head 130 is located in the maintenance mode . The maintenance space 6 may be of sufficient size to separate the components of the propulsion head 130 and store them therein or to allow the operator to access the propulsion head 130 to perform maintenance, It may be located above the surface of the water.

As shown in FIGS. 3 and 6, the canister type thruster 100 includes a plurality of restraint devices 150 that can restrain the canister 110 without shaking in a state of being switched to an operation mode, a moving mode, Respectively.

The restraining device 150 includes a driving part 151 which is installed in the canister 110 and is composed of a motor or a hydraulic cylinder and a latching rod 152 which protrudes outside the canister 110 by the operation of the driving part 151, And a plurality of latching members 153 which are fixed to the inner surface of the trunk 2 at a position corresponding to the restraining device 150 and have grooves which are engaged by the latching rod 152. The plurality of latching members 153 may be provided at positions corresponding to the engagement of the latching rod 152 in a state where the canister 110 moves to the operation mode, the movement mode, and the maintenance mode.

7 to 9, the latching member 153 includes a support portion 154 provided on the inner surface of the trunk 2, a latching rod 152 provided rotatably on the support portion 154, And a load pocket 157 for receiving the end of the rod.

The rear surface of the support portion 154 is welded and fixed to the trunk 2, and the front surface thereof has a semicircular support hole 155. The load pocket 157 rotatably received in the receiving hole 155 is provided in a shape of arc having a circular arc shape on the back surface of which is more than half of the entire circumference. Therefore, the support portion 154 includes the fork support portion 156 on the front surface so as to stably support the load pocket 157. The support portion 154 and the fork support portion 156 can be coupled through the bolt B or the like so as to improve the assembling property and the operation stability of the load pocket 157. Further, even when the load pocket 157 is damaged, .

The load pocket 157 has a latching groove 157a on the front surface thereof to receive the latching rod 152. [ 7, the entrance of the latching groove 157a is formed to be larger than the diameter of the latching rod 152, and the internal space of the latching groove 157a provided in a spherical shape includes at least a latching rod 152 A larger radius is provided. Therefore, the latching rod 152 which is drawn into the latching groove 157a can be stably received in the load pocket 157 even if it deviates to some extent from the normal entry axis direction X1 shown in Fig. The end of the fork support portion 156 is also curved to the side of the load pocket so that the engagement rod 152 can easily enter.

The support hole 155 of the support portion 154 is provided with a stopper hole 155a for restricting the rotation of the rod pocket 157. The rod pocket 157 has a stopper hole As shown in FIG. In the absence of the stopper hole 155a and the rotation protrusion 158, the engagement groove of the rotating rod pocket 157 may collide with the end of the engagement rod 152, The rotation of the locking rod 152 may not be allowed.

When the engaging rod 152 moves in the axial direction X2 deviated from the normal entry axis direction X1 as shown in Fig. 8, the one end portion of the engaging groove 157a, The spherical entire surface of the first electrode 152 contacts. The latching rod 152 to be inserted into the latching groove 157a pushes one end of the contacted rod pocket 157 and the pushed rod pocket 157 rotates clockwise in the drawing. The rod pocket 157 is stopped after the rotation protrusion 158 is rotated to the edge of the stopper hole 155a by the axial force of the entering locking rod 152 and then the locking rod 152 is stopped And is finally fixed by the coil spring 157a.

9 shows an entry state of the latching rod different from that of Fig. 8, in which the latching rod 152 enters the other axial direction X3 deviating from the normal entry axis direction X1, And the spherical entire surface of the engaging rod 152 is in contact with the other end. In this state, since the rotation protrusion 158 of the rod pocket 157 is restricted from being rotated further by the stopper hole 155a of the support portion 154, the rod pocket 157 is prevented from rotating by the engagement rod 152 by an axial force at the current position of the engaging groove 157a.

10 is a front view of the restraining device 150. Fig. As shown in the drawing, if C1 is a normal fixed region in which the engaging rod 152 enters the normal entry axis direction X1 and is caught in the load pocket 157, C2 is an enlarged fixed region expanded by the rotation of the load pocket 157 Area. Even if the entry position of the engagement rod 152 is changed (movement of the canister) or the position of the engagement member is changed (deformation of the engagement member) due to the enlarged and fixed area, 110 can be easily fixed.

1 and 2, the guide device for guiding the lifting and lowering of the canister 110 is provided on the inner surface of the trunk 2 above the lifting drive part 143 to support the rack gear 141, An upper guide unit 160 for guiding the lifting and lowering of the rack gear 141 and an upper guide unit 160 for guiding the lifting and lowering of the rack gear 141 by supporting the rack gear 2 on the inner surface of the trunk 2 below the lifting drive unit 143 And a lower guide unit 170.

That is, in this embodiment, the upper guide unit 160 and the lower guide unit 170 are mounted on the inner surface of the trunk 2 coinciding with the ascending / descending trajectory of the rack gear 141, so that the rack gear 141 is slidably supported Thereby guiding smooth up and down of the canister 110. Herein, only the upper guide unit 160 and the lower guide unit 170 are shown as an example, but the guide apparatus is provided in the same shape as the upper or lower guide units 160 and 170 so as to be additionally installed on the elevation trajectory of the rack gear 141 As shown in Fig. These guiding devices may be provided on both sides of the trunk 2 where the lifting device 140 is located.

2, 11, and 12, the lower guide unit 170 includes a support bracket 171 fixed to the inner surface of the trunk 2, and a lower bracket 171 provided symmetrically on both sides of the support bracket 171, Two tooth guide portions 172 that are in contact with the teeth 141b on both sides of the rack gear 141 and a side surface (flat surface on which no teeth are formed) of the rack gear 141 to guide the rack gear 141 up and down And side guide portions 173 provided on the support bracket 171 between the guide portions 172. [ The lower guiding unit 170 can support the rack gear 141 without shaking by keeping the two tooth guiding portions 172 and the side guiding portions 173 around the rack gear 141 in the form of a D shape.

The support bracket 171 constituting the skeleton of the guide portion 172 and the side guide portion 173 can be manufactured by welding a plurality of metal plates by welding and the support bracket 171 is welded And can be fixed to the inner surface of the trunk.

The guide portion 172 and the side guide portion 173 are respectively provided with sliding pads 172a and 173a which come in contact with the rack gear 141 and guide the lifting and lowering. Each of the sliding pads 172a and 173a may be detachably coupled to the inner surface of the tooth guide 172 and the side guide 173 so that the sliding pads 172a and 173a can be replaced when worn or damaged. One or more thickness adjusting plates 172b and 173b may be provided on the back surface of the sliding pads 172a and 173a to adjust the gap between the sliding pads 172a and 173a and the rack gear 141 during installation.

The tooth surface guide portion 172 and the side guide portion 173 are provided with entrance guide portions 172c and 173c which maintain the inclination with respect to the raising and lowering direction of the rack gear 141 so that the rack gear 141 can smoothly enter the inside thereof, And inclined guide surfaces 172d and 173d may be formed at the upper and lower ends of the sliding pads 172a and 173a to maintain the inclination with respect to the vertical direction of the rack gear 141. [

The sliding pads 172a and 173a may be formed of a non-metallic material having a weaker rigidity than the rack gear 141 so as to guide smooth sliding movement while protecting the teeth 141b of the rack gear 141. [ It may preferably be a synthetic resin material having a small friction resistance and excellent abrasion resistance and impact resistance.

The upper guide unit 160 may also be provided in substantially the same form as the lower guide unit 170. However, considering that the rack gear 141 is disengaged from the upper guide unit 160 or the lower guide unit 170 when the canister 110 is lowered or raised, The directions of the entrance guiding portions 172c and 162c for guiding the entrance of the entrance guide can be reversed. 3, the upper guide unit 160 may have an entry guide portion 162c disposed at a lower portion thereof and the lower guide unit 170 may have an entry guide portion 172c disposed at an upper portion thereof.

The distance between the upper guide unit 160 and the lower guide unit 170 may be shorter than the entire length of the rack gear 141. [ 5, the raising and lowering rack gear 141 is supported by the upper guide unit 160 and the pinion gear 142 of the elevation drive unit 143, or as shown in Fig. 3, The rack gear 141 is supported by the pinion gear 142 of the lifting and driving unit 143 and at least two points of the rack gear 141 are supported.

When the canister type thruster 100 is installed in the hull 1 for the first time or is separated from the hull 1 for repairs, the canister 110 having the propulsion head 130 mounted thereon is lifted by a crane or the like The canister 110 is lowered so that the canister 110 enters the opening in the upper portion of the trunk 2. [

At this time, the rack gears 141 on both sides of the canister 110 are guided by the upper guide unit 160 and then engaged with the pinion gear 142 of the elevation driving unit 143 located below the rack guide 141, Lt; / RTI > Thereafter, the canister 110 can be introduced by the operation of the lifting drive unit 143, and the descending rack gear 141 can naturally enter the lower guide unit 170 and be stably supported.

Particularly, in this embodiment, since the upper guide unit 160 and the lower guide unit 170 are arranged on the same line as the rack gear 141 to guide the rack gear 141, the guide device and the lift device are disposed at different positions It is possible to implement an easy installation as compared with a normal canister type thruster.

If the guiding device and the landing gear are provided separately like a normal canister type thruster, precise engagement of the rack gear and the pinion gear of the lifting gear should be taken into consideration while maintaining accurate coupling of the guide device during the installation process. And it is very difficult to implement accurate installation. Large structures such as canisters are not easy to handle due to their size and weight. However, in the canister type thruster of this embodiment, the upper guide unit 160 and the lower guide unit 170 are disposed on the same line as the rack gear 141 of the elevating device 140 to guide the raising and lowering of the rack gear 141 It is possible to realize easier installation. In addition, since it is not necessary to separately install a rail for guiding the canister 110, it is possible to simplify the construction, thereby reducing manufacturing cost and increasing productivity.

2: trunk, 110: canister,
130: propelling head, 131: propeller,
140: lifting device, 141: rack gear,
142: Pinion gear 150: Restraint device,
152: latching rod, 153: support portion,
157: a load pocket, 158: a rotation projection,
160: upper guide unit, 170: lower guide unit.

Claims

A canister which ascends and descends in a trunk of a ship or a floating structure;
A latching rod projecting outwardly from the canister;
An engaging member provided on the inner surface of the trunk so as to face the engaging rod; And
And a load pocket rotatably provided inside the engaging member.

The method according to claim 1,
Wherein the load pocket includes a latching groove for latching the latching rod on a front surface thereof,
And the entrance of the catching groove is larger than the diameter of the catching rod.

The method according to claim 1,
The load pockets are provided in a favorable arc shape,
Wherein the engaging member is provided on the inner surface of the trunk and has a support portion having a hemispherical support groove,
And a fork support portion provided on a front surface of the support portion and surrounding a front surface of a load pocket provided in the rotation groove.

The method of claim 3,
Wherein the support groove includes a stopper hole for restricting rotation of the load pocket,
Wherein the load pocket includes a rotation protrusion that rotates in the stopper hole.

A canister which ascends and descends in a trunk of a ship or a floating structure;
A latching rod projecting outwardly from the canister;
An engaging member provided on the inner surface of the trunk and provided opposite to the engaging rod; And
And a load pocket rotatably provided in the engaging member so as to expand a region where the engaging rod is engaged and fixed while being rotated upon entry of the engaging member.

6. The method of claim 5,
The load pockets are provided in a friendly shape,
Wherein the engaging member is provided on the inner surface of the trunk and has a support portion having a hemispherical support groove,
And a fork support portion provided on a front surface of the support portion and surrounding a front surface of a load pocket provided in the rotation groove.

The method according to claim 6,
Wherein the support groove includes a stopper hole for restricting rotation of the load pocket,
Wherein the load pocket includes a rotation protrusion that rotates in the stopper hole.

6. The method according to claim 1 or 5,
A lifting device for lifting the canister;
And a guide device for guiding the lifting and lowering of the canister.

9. The method of claim 8,
Wherein the lift device comprises a rack gear provided on the outer surface of the canister in a long length in an ascending / descending direction, and a lifting and driving unit provided in the trunk and including a pinion gear engaged with the rack gear and a driving source for driving the rack gear.

10. The method of claim 9,
The guide device includes an upper guide unit installed on an inner surface of the trunk of the upper part of the lifting and lowering part to guide the lifting and lowering of the rack gear, a lower guide unit installed on the inner surface of the trunk of the lower part of the lifting and lowering part, Including a canister thruster.