KR101805493B1 - Lifting control apparatus of lifting operation in azimuth thruster recovery operation - Google Patents

Lifting control apparatus of lifting operation in azimuth thruster recovery operation Download PDF

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Publication number
KR101805493B1
KR101805493B1 KR1020160034771A KR20160034771A KR101805493B1 KR 101805493 B1 KR101805493 B1 KR 101805493B1 KR 1020160034771 A KR1020160034771 A KR 1020160034771A KR 20160034771 A KR20160034771 A KR 20160034771A KR 101805493 B1 KR101805493 B1 KR 101805493B1
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South Korea
Prior art keywords
thruster
platform
hydraulic
tensioners
valve
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KR1020160034771A
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Korean (ko)
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KR20170110414A (en
Inventor
이종건
김성엽
박제욱
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대우조선해양 주식회사
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    • B63B9/00—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
    • B63B2009/007—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/448—Floating hydrocarbon production vessels, e.g. Floating Production Storage and Offloading vessels [FPSO]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

[0001] The present invention relates to a thruster recovery ascending operation control device, which comprises a tensioner which is a separate auxiliary hydraulic cylinder operating in conjunction with a hydraulic jack, the tension cylinder holding the upper part of the thruster platform, , The displacement sensor detects the tune status of the hydraulic jack through the rising position of the tensioner and then controls the hydraulic pressure of the hydraulic jack according to the tune status of the hydraulic jack, Can be realized.

Description

TECHNICAL FIELD [0001] The present invention relates to a thruster recovery operation control device for an offshore plant,

More particularly, the present invention relates to a thruster recovery control apparatus for an offshore plant, and more particularly, to an apparatus for controlling the thruster recovery operation of a thruster platform by controlling the entire operation of the hydraulic jack, And more particularly, to a thruster recovery rising operation control device for an offshore plant capable of smoothly performing a rising operation without accident.

In recent years, as industrialization and industrialization have accelerated, the use of natural resources (petroleum, natural gas, etc.) is gradually increasing, and stable production and supply of natural resources with limited reserves are becoming very important.

Natural resource-related companies or countries are actively seeking to develop marginal fields or ships suitable for the development of deep-sea oil fields, which have hitherto lost economic efficiency.

A typical example of this type of drill ship is a drill ship that can sail independently with various drilling equipment and can drill natural resources existing in marine limestone oil fields.

A dynamic positioning control system is installed on the drill ship to respond to the change in position due to swinging of the hull due to algae, wind direction, wind speed, and wave height. (Azimuth Thruster) which controls the self-propulsion of the hull by generating propulsive force or propulsion force in the direction of 360 ° in the water or generating lateral propulsive force.

The Azimuth thrusters are equipped with three propellers on the bow section of the drill ship and three on the stern section, each equipped with a propeller capable of rotating 360 degrees, with propulsion and position control combined with propelling, propelling or rotating the drill ship. It is a propeller.

Azimuth thrusters are required to undergo performance tests at certain intervals, and the performance of the thruster is checked and the maintenance of the thruster is performed in the event of a failure.

For example, in the case of drillships, leagues, and FPSOs, 50 tons of Azimuth thrusters every 5 to 10 years are lifted using a crane, then removed and then maintained.

After completion of maintenance, use the crane to descend the Ajimus thrusters again and install them under the hull. This series of thruster maintenance operations is called Thruster Recovery.

The thruster recovery uses a hydraulic jack to perform a rising operation to raise the thruster platform and a down operation to lower the thruster platform.

Typically, the azimuth thrusters are configured such that a thruster platform is coupled to the top of the propeller and a thrust motor is coupled to the top of the thruster platform.

In the vertical direction of the hull, a thruster room is provided which provides the installation space and passage for the azimuth thruster. A guide rail for guiding the raising and lowering operation of the thruster platform is formed on a sidewall of the thruster room and a platform support rim for providing a hydraulic jack is formed on a lower end thereof.

The hydraulic jacks are installed to raise or lower the thruster platform, and the hydraulic jacks are installed in total of eight, two on each side. During the thruster recovery operation, when the thruster platform is in the ascending operation, the load of the hydraulic jack is all tuned (synchronized) to about 200-300 mm to rise the thruster platform. One hydraulic jack can rise up to 200 tons with a capacity of 25 tons. The maximum permissible tuning error is about 5mm when the load of hydraulic jack is 200-300mm.

If eight hydraulic jacks are not synchronized at the same time, the thruster platform may be interfered with and caught in the guide rail during the ascending operation of the thruster platform. To avoid this accident, Control is required.

Conventionally, in the thruster recovery operation, when the thruster platform is lifted up, a tube branching method is frequently used, and one strand of tubing is branched into eight strands of tubing lines, and the flow rate of each hydraulic jack is controlled Because of the unloading of the Ajimus thrusters, the thruster's platform is frequently interfered with and caught by the guide rails.

In addition, since the space for installing the hydraulic jack is narrow, it is difficult to visually check, and it is technically difficult to install a sensor that can confirm the position of the rod of the hydraulic jack due to seawater inflow. Therefore, . Therefore, there is a desperate need for a technique that can solve the problem that the hydraulic load of the Ajimus thrusters does not coincide due to a partial load (unbalanced load).

Publication No. 10-2009-0032618 Publication No. 10-2011-0138782

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a tensioner which is a separate auxiliary hydraulic cylinder operated in cooperation with a plurality of hydraulic jacks, The displacement sensor detects the tuning state of the hydraulic jack through the ascending position of the tensioner and then individually controls the hydraulic pressure of the hydraulic jack according to the tuning state of the hydraulic jack so that the hydraulic jack A thruster recovery rising operation control device for an offshore plant capable of realizing the whole tuning (equalization).

In order to achieve the above object, the present invention provides a thruster recovery thruster recovery control device and method for an offshore plant.

A thruster recovery operation control apparatus for a marine plant of the present invention includes a thruster having a propeller, a thruster platform coupled to an upper portion of the propeller, and a thruster motor coupled to an upper portion of the thruster platform, And a thruster room for providing a path for maintenance, wherein the thruster platform is a device for controlling the up operation of the thruster platform in order to recover the thruster, A plurality of hydraulic jacks installed at a lower end of the thruster room for raising the thruster platform upwardly during a rising operation of the thruster room; A plurality of tensioners installed in an inner wall of the thruster room for supporting the thruster platform in a downward direction, the tensioners being operated in cooperation with the plurality of hydraulic jacks; A first on-off valve installed in a hydraulic line of the plurality of hydraulic jacks to control a flow rate of fluid flowing into the hydraulic jack; A sensor installed in the plurality of tensioners for sensing a tuning of each of the hydraulic jacks; A controller for controlling the first on-off valve according to a tuning signal of the plurality of hydraulic jacks sensed by the sensor and controlling the flow rate of fluid flowing into the plurality of hydraulic jacks to realize the tuning of the plurality of hydraulic jacks; And a second on-off valve mounted on the hydraulic line of the plurality of tensioners to control a flow rate of the fluid flowing into the plurality of tensioners.

When sudden inflow of seawater into the thruster room occurs during the ascending operation of the thruster platform, the control unit turns off the second on-off valve, stops the tensioner, and blocks inflow of seawater.

An accumulator may further be installed in a hydraulic line connecting the hydraulic lines of the plurality of hydraulic jacks and the hydraulic lines of the plurality of tensioners.

The control unit may control the operation of the first on-off valve and the second on-off valve by wireless communication through a digital out junction box.

The thruster includes a propeller, a thruster platform coupled to an upper portion of the propeller, and a thruster motor coupled to an upper portion of the thruster platform. The thruster includes a space for installing the thruster, Wherein the thruster platform is provided with a plurality of tensioners mounted on an inner wall of the thruster room, the method comprising the steps of: Supporting the thruster platform downward with the load lowered; Opening a first on-off valve of a plurality of hydraulic jacks installed at a lower end of the thruster room; Elevating the thruster platform with the rods of the plurality of hydraulic jacks rising; A step of raising the rods of the plurality of tensioners in conjunction with the rise of the rods of the plurality of hydraulic jacks; Sensing a tuning of the plurality of hydraulic jacks by a sensor installed in the plurality of tensioners through a rising position of the rods of the plurality of tensioners; The controller controls each of the first on-off valves according to the tuning signal of the plurality of hydraulic jacks sensed by the sensor and controls the flow rate of fluid flowing into the plurality of hydraulic jacks to realize the tuning of the plurality of hydraulic jacks ; And withdrawing the thruster platform out of the thruster room using a crane.

When the sudden inflow of seawater into the thruster room occurs during the rising operation of the thruster platform, the control unit turns off the second on-off valve and stops the tensioner to shut off the inflow of seawater to raise the thruster platform Balance is controlled.

As described above, according to the present invention, there is provided a tensioner which is a separate auxiliary hydraulic cylinder that operates in cooperation with a plurality of hydraulic jacks, each tensioner catches the upper part of the thruster platform, and a displacement sensor is installed in the tensioner, The displacement sensor detects the tune state of the plurality of hydraulic jacks through the ascending position of each tensioner and individually controls the hydraulic pressure of the plurality of hydraulic jacks in accordance with the tune state of the plurality of hydraulic jacks, So that the whole tuning can be realized and the smooth upward driving can be performed.

In addition, when the thruster platform is operated in a rising operation, when a sudden large amount of seawater flows into the thruster room, the tensioner can pressurize the thruster platform downward to primarily buffer the seawater pressure, If the tuning error of the plurality of hydraulic jacks is constantly generated, if the pre-set value is equal to or greater than the predetermined value, the control unit turns off the second on-off valve and stops the tensioner to prevent the thruster platform from further rising, , It is possible to prevent an accident that the thruster platform rises and is interfered with or caught in the guide rail.

Figs. 1 to 3 are views for explaining a thruster recovery operation for an offshore plant
4 is a plan view illustrating the position of the hydraulic jack;
Figure 5 is a longitudinal section showing the locking of the clamp
Figure 6 is a longitudinal section showing the unlocking of the clamp.
FIG. 7 is a block diagram showing a thruster recovery elevator operation control apparatus for a marine plant according to the first embodiment of the present invention
8 is a configuration diagram showing an apparatus for controlling the operation of the thruster recovery for a marine plant according to the second embodiment of the present invention
9 is a view showing a state in which the lifting operation is ready and the tensioner is being lowered.
10 is a view showing the backward movement of the tensioner and the inflow of seawater after completion of the rising operation
Fig. 11 is a drawing showing withdrawal of a thruster platform using a crane after completion of a lift-up operation
12 is a block diagram for explaining a rising operation control method of thruster recovery for an offshore plant

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a thruster recovery thruster recovery control system and method for a marine plant according to the present invention will be described in detail with reference to the accompanying drawings.

The thruster 10 for an offshore plant typically has a thruster platform 12 coupled to the top of the propeller 11 and the propeller 11 and a thruster motor 13 coupled to the top of the thruster platform 12 Respectively. The shaft 14 is engaged with the center of the thruster platform 12. A thruster room (1) is provided in the interior vertical direction of the offshore plant, providing a space for installing the thruster (10) and a passage for maintenance.

1 to 3 are views for explaining a thruster recovery operation. In Fig. 1, the thruster motor 13 and the shaft 14 are separated from the azimuth thruster 10, The process of withdrawing from the thruster room (1) is shown. A guide rail (2) is formed on a side wall of the thruster room (1), and a platform supporting step (3) is formed on a lower end part thereof. On the platform support jaw 3, a hydraulic jack 110 for platform up operation and down operation is installed.

The guide rail 2 serves to guide the upward and downward movement of the thruster platform 12 in the ascending and descending operations.

FIG. 2 shows a process of pulling out the propeller 11 and the thruster platform 12 to the outside by using a crane.

3, the lower end of the hull is closed with the closing cover 4, the thruster platform 12 is placed on the safety cover 5, the propeller 11 and the thruster motor 13 are mounted on the deck 6 Leave it to maintenance.

4 is a plan view for explaining the position of the hydraulic jack;

Referring to FIG. 4, eight hydraulic jacks 110 are installed at each of the two sides. In the thruster recovery operation, when the thruster platform 12 is lifted up, Mm to raise the thruster platform 12. One hydraulic jack 110 is capable of elevating up to 200 tons with a capacity of 25 tons. The maximum allowable tuning error of the hydraulic jack 110 during the 200-300 mm raising operation is about 5 mm. If eight hydraulic jacks are not synchronized at the same time, the thruster platform 12 may be interfered with or caught in the guide rail during the ascending operation of the thruster platform. Therefore, in order to prevent such accidents, Position and speed tuning performance is required.

5 shows a state in which the thruster platform is locked to the support jaw by a clamp, and Fig. 6 shows a state in which the thruster platform is unlocked in the support jaw by rotating the clamp.

Referring to the above drawings, a can flange 7 for supporting the thruster platform 12 is formed on the lower surface of the thruster platform 12. [ A clamp 8 is rotatably coupled to the upper portion of the thruster platform 12 by a hinge 8a so that the thruster platform 12 is brought into close contact with the platform support jaw 3 at the completion of maintenance, (See Fig. 5), and the clamp 8 is configured to unlock to perform maintenance work (see Fig. 6).

Conventionally, it is necessary to install a sensor in the hydraulic jack for ascertaining the tuning performance, but it is necessary to install the sensor in the hydraulic jack when the thruster platform is in the ascending operation As the seawater enters and sinks into seawater, it is technically difficult to precisely detect the sensor as well as to install the sensor.

A tensioner 120 interlocked with each hydraulic jack 110 is installed in order to solve the problems of the related art and a displacement sensor is installed in the tensioner 120 so that the hydraulic jacks The tuning state can be confirmed efficiently. It is possible to realize the tuning of the entire hydraulic jack by individually adjusting the hydraulic pressure of each hydraulic jack after confirming the tuning state of each hydraulic jack.

The thruster recovery uprising control device (100) for a marine plant of the present invention is capable of improving the precise position and speed tuning performance by controlling the rising operation of the thruster platform (12) in thruster recovery .

The offshore plant has a thruster room 1 for providing a space for installing Ajimus thruster 10 and Ajimus thruster 10 and a passage for maintenance.

FIG. 7 is a block diagram showing a thruster recovery operation control device for a marine plant according to the first embodiment of the present invention, and is a diagram showing the technique of the present invention for the sake of understanding.

Referring to FIG. 7, the rising operation control device for thruster recovery for offshore plant according to the first embodiment of the present invention includes a rising operation of the thruster platform 12 in order to recover the azimuth thruster 10 , Comprising: a hydraulic jack (110) installed at a lower end of a thruster room (1) for raising a thruster platform (12) upward during a rising operation of the thruster platform (12); And a tensioner 120 installed in the inner wall of the thruster room 1 to operate in conjunction with the hydraulic jack 110 and to support the thruster platform 12 downward.

Further, the thruster recovery operation control device for the offshore plant according to the first embodiment of the present invention is provided with a hydraulic pump (not shown) which is installed in the hydraulic line L1 of the hydraulic jack 110 and opens and closes the fluid flow rate flowing into the hydraulic jack 110 A first on-off valve 130; A second on-off valve (150) installed in the hydraulic line (L2) of the tensioner (120) for controlling the flow rate of the fluid flowing into the tensioner (120); A sensor 140 installed in the tensioner 120 for sensing the tuning of the hydraulic jack 110; Off valve 130 according to the tuning signal of the hydraulic jack 110 sensed by the sensor 140 and controls the flow rate of the fluid flowing into the hydraulic jack 110 to control the flow rate of the fluid And a control unit 160 for realizing the control unit 160.

The control unit 160 turns off the second on-off valve 150 and stops the tensioner 120 when the sudden inflow of seawater into the thruster room 1 occurs during the up operation of the thruster platform 12 It is possible to block the inflow of seawater.

8 is a configuration diagram showing a thruster recovery rising operation control apparatus for a marine plant according to a second embodiment of the present invention. 10 is a view showing the backward movement of the tensioner and the inflow of seawater after completion of the upward operation, and FIG. 11 is a view showing the withdrawal of the thruster platform using the crane after the completion of the upward operation.

Referring to the drawings, a thruster recovery up operation control apparatus 100 for an offshore plant according to a second embodiment of the present invention includes a hydraulic jack 110, a tensioner 120, a first on-off valve 130, A sensor 140, a second on-off valve 150, and a controller 160.

The hydraulic jack 110 may be formed at the lower end of the thruster room 1 to elevate the thruster platform 12 upwardly, for example, eight at the time of the upward operation of the thruster platform. That is, the first hydraulic jack 110a to the eighth hydraulic jack 110h may be configured.

The tensioner 120 operates in conjunction with the plurality of hydraulic jacks 110 and is constructed of a plurality of, for example, eight, inner walls of the thruster room 1 to support the thruster platform 12 downward . That is, the first to sixth tensioners 120a to 120h may be configured. The first to eighth tensioner 120a to the eighth tensioner 120h are configured to operate in a one-to-one relationship with the first to the eighth hydraulic jacks 110a to 110h, respectively.

The first on-off valve 130 is installed on the hydraulic line L1 of the plurality of hydraulic jacks 110 and serves to turn on and off the flow rate of the fluid flowing into the plurality of hydraulic jacks 110, that is, to open and close. The hydraulic line L1 is connected to the hydraulic tank HPU.

The sensor 140 may be provided in the plurality of tensioners 120 and may use a displacement sensor LVDT to sense the tuning of the plurality of hydraulic jacks 110. [

The second on-off valve 150 is installed on the hydraulic line L2 of the tensioner 120 and serves to open and close the flow rate of the fluid flowing into the tensioner 120. The hydraulic line L2 is connected to the hydraulic tank HPU.

The control unit 160 controls the first on-off valve 130 according to the tuning signals of the plurality of hydraulic jacks 110 sensed by the sensor 140 and controls the flow rate of the fluid flowing into the plurality of hydraulic jacks 110 The tuning of the entire hydraulic jack 110 can be realized.

The control unit 160 turns off the second on-off valve 150 and stops the tensioner 120 when the sudden increase of the amount of seawater into the thruster room 1 occurs during the upward operation of the thruster platform. It is possible to prevent an accident that the thruster platform 12 is raised and interfered with or caught in the guide rail 2. [

An accumulator 170 may further be installed on the hydraulic line L3 connecting the hydraulic line L 1 of the plurality of hydraulic jacks 110 and the hydraulic line L 2 of the plurality of tensioners 120. The accumulator 170 serves to accumulate and replenish the working fluid (hydraulic pressure) in the hydraulic jack 110 and the tensioner 120.

The control unit 160 may control the operation of the first on-off valve 130 and the second on-off valve 150 by wireless communication through the digital out junction box 180. [

The present invention, on the other hand, provides a method of controlling the ascending operation of the thruster platform 12 in order to recover the azimuth thruster 1.

12 is a block diagram for explaining a rising operation control method of thruster recovery for an offshore plant.

In the thruster recovery control method for an offshore plant according to the present invention, the loader of the tensioner 120 installed on the inner wall of the thruster room 1 descends to move the thruster platform 12 (S10); Opening (S20) the first on-off valve 130 of the hydraulic jack 110 installed at the lower end of the thruster room 1; A step S30 of raising the thruster platform 12 upward with the load of the hydraulic jack 110 rising; A step S40 of raising the rod of the tensioner 120 in conjunction with the rising of the rod of the hydraulic jack 110; A step S50 of detecting the tuning of the hydraulic jack 110 by the sensor 140 installed in the tensioner 120 through the raised position of the rod of the tensioner 120; The control unit 160 controls the first on-off valve 130 according to the tuning signal of the hydraulic jack 110 sensed by the sensor 140 and controls the flow rate of the fluid flowing into the hydraulic jack 110, 110) (S60); And a step (S70) of taking the thruster platform 12 out of the thruster room 1 using a crane (C).

The rising operation control method of the thruster recovery for offshore plant of the present invention will be described in more detail as follows.

That is, in step S10, the rod of the tensioner 120 installed on the inner wall of the thruster room 1 descends to support the thruster platform 12 downward. To this end, the controller 160 opens the second on-off valve 150 to supply the working fluid (hydraulic pressure) to the tensioner 120.

The reason why the loader of the tensioner 120 is lowered to support the thruster platform 12 downwardly is to operate the tensioner 120 in conjunction with the hydraulic jack 110 and to operate the thruster platform 12 ) So that it does not lift up.

In step S20, the first on-off valve 130 of the hydraulic jack 110 installed at the lower end of the thruster room 1 is opened. The control unit 160 opens the first on-off valve 130 to supply the hydraulic fluid to the hydraulic jack 110. [

In step S30, the rod of the hydraulic jack 110 rises to raise the thruster platform 12 upward. During the up operation of the thruster platform, the eight hydraulic jacks 110 are tuned up, for example, by 200 mm to raise the thruster platform 12. One hydraulic jack 110 is capable of elevating up to 200 tons with a capacity of 25 tons. The maximum permissible tuning error at the time of the 200 mm rising operation of the hydraulic jack 110 is about 5 mm. The load rise of the hydraulic jack 110 is not limited to 200 mm, and may be changed according to design conditions.

In step S40, the load of each tensioner 120 is raised by interlocking with the rise of the rod of the hydraulic jack 110 at a ratio of 1: 1.

In step S50, the sensor 140 installed in the tensioner 120 senses the tuning of the hydraulic jack 110 in real time through the load elevation position of the tensioner 120 and determines.

If eight hydraulic jacks are not synchronized at the same time, since the thruster platform 12 may interfere with or interfere with the guide rail 2 during the ascending operation of the thruster platform 12, Very precise position and speed tuning performance is required to prevent in advance.

In step S60, the control unit 160 controls the first on-off valve 130 according to the tuning signal of the hydraulic jack 110 sensed by the sensor 140 and controls the flow rate of the fluid flowing into the hydraulic jack 110 So as to realize the tuning of the hydraulic jack 110. For example, when the first hydraulic jack 110a is raised too fast due to the detection of the sensor 140, the first on-off valve 130 of the first hydraulic jack 110a is shut off and the first hydraulic jack When the eighth hydraulic jack 110h rises too slowly, the on-off valve 130 of the eighth hydraulic jack 110h is further opened to raise the elevation of the eighth hydraulic jack 110h, The control of the entire hydraulic jack 110 is controlled.

Then, in step S70, the thruster platform is taken out of the thruster room 12 by using the crane C.

On the other hand, when a large amount of seawater suddenly flows into the thruster room 1 during the upward operation of the thruster platform 12, the thruster platform 12 is lifted up due to seawater pressure. At this time, an accident that the thruster platform 12 is caught in the guide rail 2 may occur. In the present invention, when an abruptly large amount of seawater flows into the thruster room 1 during a rising operation of the thruster platform, the load of the tensioner 120 is raised by the seawater pressure, and the sensor 140 is moved to the tensioner The control unit 160 turns off the second on-off valve 150 and stops the load of the tensioner 120 to shut off the inflow of the seawater, thereby preventing the thruster platform 12 The rising operation balance can be efficiently controlled.

After all the seawater has flowed into the thruster room 1, the first on / off valve 130 is operated again to operate in conjunction with the sensor signal of the tensioner 120.

As described above, there is provided a tensioner which is a separate auxiliary hydraulic cylinder that operates in conjunction with the hydraulic jack. The tensioner holds the upper part of the thruster platform. A displacement sensor is installed in the tensioner, It is possible to realize the tuning of the entire hydraulic jack during the ascending operation of the thruster platform by individually controlling the hydraulic pressure of the hydraulic jack in accordance with the tuning state of the hydraulic jack after grasping the tuning state of the hydraulic jack through the position.

In addition, when the thruster platform is moved upwardly and a large amount of seawater enters the thruster room suddenly into the thruster room, the load of the tensioner is stopped and the thruster platform is supported downward, If the tuning error of the hydraulic jack is continuously generated and is equal to or higher than the predetermined value, the control unit turns off the second on-off valve and stops the tensioner to prevent the thruster platform from further rising, , It is possible to prevent an accident that the thruster platform is interfered with or caught in the guide rail.

1: Thruster room
2: Guide rail
3: Platform support jaw
7: Can flange
8: Clamp
10: Ajimus Thruster
12: thruster platform
13: Thruster motor
14: Shaft
100: Lift control device
110: Hydraulic jack
110a: First hydraulic jack
110h: Eighth hydraulic jack
120: tensioner
120a: first tensioner
120h: Eighth tensioner
130: first on-off valve
140: sensor
150: second on-off valve
160:
170: accumulator
180: Digital Out Junction Box
C: Crane
L1, L2: hydraulic line
L3: Connecting hydraulic line
HPU: Hydraulic tank

Claims (11)

An azimuth thruster having a propeller, a thruster platform coupled to an upper portion of the propeller, and a thruster motor coupled to an upper portion of the thruster platform, and a space for installing the azimuth thruster, Wherein the thruster platform is provided with a thruster room, the thruster platform having a thruster room, wherein the thruster platform comprises:
A plurality of hydraulic jacks installed at a lower end of the thruster room for raising the thruster platform upward during a rising operation of the thruster platform;
A plurality of tensioners installed in an inner wall of the thruster room for supporting the thruster platform in a downward direction, the tensioners being operated in cooperation with the plurality of hydraulic jacks;
A first on-off valve installed on a hydraulic line of the plurality of hydraulic jacks to open and close a fluid flow rate flowing into the plurality of hydraulic jacks;
A sensor installed in the plurality of tensioners to sense the tuning of the plurality of hydraulic jacks;
A controller for controlling the first on-off valve according to a tuning signal of the plurality of hydraulic jacks sensed by the sensor and controlling the flow rate of fluid flowing into the plurality of hydraulic jacks to realize the tuning of the plurality of hydraulic jacks; And
Further comprising: a second on-off valve installed on a hydraulic line of the plurality of tensioners to control a flow rate of fluid flowing into the plurality of tensioners,
Wherein when a sudden inflow of seawater into the thruster room occurs during a rising operation of the thruster platform, the rod of the plurality of tensioners is raised by the seawater pressure, and the sensor detects the rising position of the rods of the plurality of tensioners Wherein the control unit turns off the second on-off valve and stops the load of the plurality of tensioners to shut off the inflow of seawater to the thruster recovery apparatus for an offshore plant. delete delete The method according to claim 1,
Wherein an accumulator is further provided on a hydraulic line connecting the hydraulic line of the plurality of hydraulic jacks and the hydraulic line of the plurality of tensioners. The method according to claim 1,
Wherein the control unit controls operation of the first on-off valve and the second on-off valve by wireless communication through a digital out junction box.
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KR1020160034771A 2016-03-23 2016-03-23 Lifting control apparatus of lifting operation in azimuth thruster recovery operation KR101805493B1 (en)

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