KR20230166202A - baby ship lifting and launching crane of ship - Google Patents

Abstract

The present invention relates to a ship crane for supporting the lifting and lowering of a ship's own ship, which is installed on a mothership and is capable of lifting or lowering a ship by combining it with a main wire rope drawn or wound from a main winch mounted on a main body, wherein the main wire is attached to the main body. The first and second sub wire ropes are pulled out or wound downward through sub rods extending on both sides along the direction intersecting the transport direction of the rope, so that the own ship can be lifted or lowered in a three-point support state together with the main wire rope. A sub winch unit is further provided. According to this ship crane for supporting the lifting and lowering of the own ship, the first and second sub-wire ropes along with the main wire rope are driven to generate a set holding force when the ship is raised and lowered, so that the lifting and lowering operation can be performed more stably in a three-point support state. It provides possible advantages.

Description

Ship crane for charity lifting and lowering support {baby ship lifting and launching crane of ship}

The present invention relates to a ship crane for supporting the lifting and lowering of a ship's own ship, and more specifically, to a ship crane for supporting the lifting and lowering of a ship's own ship, which supports the lifting or lowering of a ship more stably in a three-point support state.

Generally, the davit is installed on the side deck of a mother ship equipped with a high-speed single boat, and is a mechanical device that allows the rapid launch or recovery of a high-speed single boat in the event of an emergency such as drowning or chasing a criminal, or when performing the intended task. says

This davit has a crane structure in which a wire rope, which is wound or unwound by the forward and reverse rotation of the winch installed on the upper part of the main body, hangs down from the end of the arm part of the main body and is tied to the center of the high-speed boat to launch or retrieve it. The structure has been disclosed in various ways, such as in Domestic Patent No. 10-0688354.

On the other hand, when raising or lowering a high-speed boat using a conventional davit (hereinafter referred to as a crane), there is a risk that it may be shaken or rotated or, in severe cases, tipped over due to the surrounding environment such as waves and wind. To prevent this, wire ropes are used. The process of manipulating the pull cords separately tied to the head and stern of a high-speed boat at a location outside the central part where the rope is tied is held and adjusted by the worker to prevent rotation is carried out in parallel. In this case, a worker safety accident may occur, and the roiling It has the disadvantage of not being able to control the load stably.

In other words, due to the moving waves, the high-speed single boat (hereinafter referred to as the ship's ship) attached to the crane constantly moves vertically, horizontally, or rotationally, which has the disadvantage of making stable launch or recovery difficult.

The present invention was created to solve the above problems, and its purpose is to provide a ship crane for supporting the lifting and lowering of the own ship, which supports the lifting or lowering of the ship more stably in a three-point support state.

In order to achieve the above object, the ship crane for supporting the lifting and lowering of the ship according to the present invention is installed on the mother ship and is capable of lifting or lowering the ship by combining it with the main wire rope drawn or wound from the main winch mounted on the main body. In a ship crane for supporting ship lifting and lowering, the first and second sub wire ropes are pulled out or wound downward through sub rods extending on both sides of the main body along a direction intersecting the transfer direction of the main wire rope. It is further provided with a sub winch unit capable of lifting or lowering the own ship in a three-point support state along with the main wire rope.

Preferably, the sub winch unit includes a sub body mounted on the main body without interfering with the main wire rope centered on the transfer path of the main wire rope of the main body; A sub drum on which the first sub wire rope and the second sub wire rope are wound or unwound in a separated state in first and second winding areas defined by a partition on the sub winding shaft rotatably mounted on the sub body; ; a sub-drive unit that drives the sub-drum to rotate forward and backward; and a path switching roller mounted on the sub body to change the transfer path of the first and second sub wire ropes from the sub drum to a direction toward the extension direction of the sub rod.

Additionally, a rotation support pipe mounted on the sub-body and having a hollow space for rotatably receiving the sub-rod therein; It further includes a longitudinal roller coupled to the end of the sub-rod and guiding the transport path of the first and second sub-wire ropes in a downward direction intersecting the extension direction of the sub-rod, wherein the sub-rod is connected to the first and second sub-wire ropes. The second sub-wire rope is formed in the form of a hollow tube so that it can be transferred to the longitudinal roller through the inside.

In addition, the path switching roller is tilting installed on the sub body along a direction parallel to the extension direction of the sub rod so that it can be tilted to a position corresponding to a change in the thickness of the first and second sub wire ropes wound around the sub drum. It is preferable that the support bracket is installed rotatably about the hinge and is rotatable about a support shaft extending in a direction intersecting the tilting hinge.

According to one aspect of the invention, the sub-drive unit includes a sub-drive motor coupled to the sub-winding shaft to rotate the sub-winding shaft forward and backward; a control unit provided with a manual control key that allows the user to control forward and reverse rotation of the sub-drive motor, and an automatic mode setting key that instructs an automatic mode to generate a torque corresponding to an automatically set holding force when the own ship is lowered; and a control unit that controls the sub-drive motor to generate torque corresponding to the set holding force when set to the automatic mode.

According to the ship crane for supporting the lifting and lowering of the own ship according to the present invention, the first and second sub-wire ropes along with the main wire rope are driven to generate a set holding force when the ship is raised and lowered, thereby enabling more stable raising and lowering in a three-point support state. It provides the advantage of being able to get the work done.

Figure 1 is a schematic front view showing the ship crane for lifting and lowering the ship according to the present invention mounted on the mother ship,
Figure 2 is an enlarged perspective view of the ship crane of Figure 1;
Figure 3 is an enlarged perspective view of the sub winch unit of Figure 2,
Figure 4 is a block diagram showing the control system of the sub winch unit of Figure 3;
Figure 5 is a block diagram showing an example of the control system of the drive control unit when a servomotor is applied;
Figure 6 is a block diagram showing an example of the control system of the drive control unit when a hydraulic motor is applied.

Hereinafter, a ship crane for supporting ship lifting and lowering according to a preferred embodiment of the present invention will be described in more detail with reference to the attached drawings.

Figure 1 is a schematic front view showing the ship crane for supporting ship lifting and lowering according to the present invention mounted on the mother ship, Figure 2 is an enlarged perspective view of the ship crane of Figure 1, and Figure 3 is a drawing. It is an enlarged perspective view of the sub winch unit of Figure 2, and Figure 4 is a block diagram showing the control system of the sub winch unit of Figure 3.

Referring to FIGS. 1 to 4, the ship crane 100 for supporting ship lifting and lowering according to the present invention is provided with a main winch 120 and a sub winch unit 200.

The main winch 120 is capable of lifting or lowering the own ship 20 by combining the main wire rope with the own ship 20.

That is, the main winch 120 is mounted on the main body 110 installed on the side of the mothership 10 to pull out or wind the main wire rope 130 by rotating the main drum 121 forward and backward. .

The main winch 120 is applied to have a lifting capacity exceeding the weight of the own ship 20.

Here, the main body 110 has an arm 114 extending upward in a multi-joint form from the base plate 112 coupled to the bus bar 10, and some arms including the longitudinal arm 114a coupled to the final end. It has a conventional structure that can be rotated in a folding or unfolding direction by a bending cylinder (not shown).

The main wire rope 130 is installed so that it can be pulled out or lifted downward from the main drum 121 through the relay roller 123 and through a longitudinal guide member (not shown) formed on the longitudinal arm 114a.

Of course, the main motor (not shown) that rotates the main drum 121 of the main winch 120 forward and backward can be operated through a separate operation unit or constructed to be controlled through the control unit 190, which will be described later.

The sub winch unit 200 includes sub rods (which extend on both sides in the area between the main drum 121 and the relay roller 123 along the direction intersecting the transport direction of the main wire rope 130 on the main body 110). By drawing or winding the first and second sub wire ropes 230 downward through 220), the own ship 20 can be lifted or lowered together with the main wire rope 130 in a three-point support state.

The sub winch unit 200 includes a sub body 210, a sub drum 241, a path switching roller 243, and a sub drive unit 280.

The sub body 210 is centered on the transfer path of the main wire rope 130 of the main body 110 and is connected to the main drum 121 and the relay roller ( 123) to support the installation of sub-winch unit operating elements including the sub-drum 241 and the path change roller 243.

The sub drum 241 is a three disc-shaped unit that extends along a direction perpendicular to the transport direction of the main wire rope 130 in the sub body 210 and is spaced apart from each other and coupled to the sub winding shaft 242 rotatably mounted. The first sub wire rope 230a and the second sub wire rope 230b are separated from each other and independently in the first and second winding areas 241a and 241b formed to be separated from each other by a partition 241c. It is designed to be wound or unwound.

The rotation support pipe 251 has a hollow body that rotatably accommodates the sub rod 255 therein and is mounted on the sub body 210 to extend along a direction perpendicular to the transport direction of the main wire rope 130. .

The sub-rod 255 is formed in a hollow tube shape so that the first and second sub-wire ropes 230a and 230b can be transported through the inside, and is received in a restrained state within the rotation support pipe 251 and rotates. It can be done.

The terminal roller 257 is rotatably coupled to the terminal bracket 257a mounted at the end of the sub-rod 255 and moves downward intersecting the extension direction of the sub-rod 255 to form the first and second sub-wire ropes 230a. ) Guides the transfer path of (230b).

The path switching roller 243 is mounted on the sub body 210 and changes the transfer path from the sub drum 241 of the first and second sub wire ropes 230a and 230b to the direction toward the sub rod 251. I order it.

The path switching roller 243 is a sub drum 241 so that it can be tilted to a position corresponding to the thickness change caused by winding or unwinding of the first and second sub wire ropes 230a and 230b, respectively, wound in a separated state. Crosses the tilting hinge 245 within the support bracket 244 installed in a 'ㄷ' shape to rotate around the tilting hinge 245 installed on the body 210 in a direction parallel to the direction in which the sub-rod 255 extends. It is installed to be rotatable about a support shaft (243a) extending in the direction.

The sub-drive unit 280 drives the sub-winding shaft 242 of the sub-drum 241 to rotate forward and reverse.

The sub-drive unit 280 includes a sub-drive motor 240, a manipulation unit 281, a display unit 283, a sensor unit 285, and a control unit 290.

The sub-drive motor 240 is coupled to the sub-winding shaft 242 and rotates the sub-winding shaft 242 forward and backward. The sub-drive motor 240 may be a servomotor driven by supplied power or a hydraulic motor driven by supplied hydraulic pressure.

When a servo motor is applied as the sub-drive motor 240, the control unit 290, which will be described later, controls the power corresponding to the torque command value corresponding to the set support force to be supplied to the server motor, and controls the current and torque supplied to the server motor. It can be constructed in a way that calculates the error with the command value and performs feedback control to reduce the error.

In addition, when a hydraulic motor is applied as the sub-drive motor 240, the control unit 290, which will be described later, commands a pressure value corresponding to the torque command value corresponding to the set holding force, and the hydraulic oil is adjusted to the hydraulic pressure corresponding to the commanded pressure value. It can be constructed by applying a hydraulic circuit that can be supplied to the motor.

The control unit 281 indicates a manual control key 281a that allows the user to control the forward and reverse rotation of the sub-drive motor 240, and an automatic mode that generates torque corresponding to the automatically set support force when the own ship 20 is lowered. There is an automatic mode setting key (281b) and a torque adjustment key (281c) that can adjust the setting value of the torque corresponding to the holding force.

The display unit 283 is controlled by the control unit 290 to display display information.

The sensor unit 285 may be constructed to provide operation status information of the main winch 120 to the control unit 190.

As an example, the sensor unit 285 receives operation information of the main winch 120 and provides it to the control unit 290, or the main wire rope 130 uses the end arm 114a to launch or retrieve the own ship 20. ) A sensor may be applied to the lower part to detect whether it is being drawn out for binding to the magnetic ship 20 and provide the information to the control unit 290.

When set to automatic mode, the control unit 290 controls the sub-drive motor 240 to generate torque corresponding to the set holding force.

The control unit 290 includes a main control unit 291 and a drive control unit 300.

The main control unit 291 processes the signal received from the operation unit 281, controls the display unit 283 to display display target information, processes the signal received from the sensor unit 285, and, when set to automatic mode, sets the Control information is provided to the sub-control unit 300 so that a torque corresponding to the holding force is generated.

The sub-controller 300 controls the sub-drive motor 240 to generate torque corresponding to the supporting force indicated by the main control unit 291.

As an example, the supporting force for the sub-drive motor 240 is set to 300 kg, and the main winch 120 is operated with a lifting capacity of 3 tons when the weight of the own ship 20 is 3 tons. Explain the condition.

When the load applied to the sub-drive motor 240 according to the displacement of the own ship 20 is greater than 300 kg when descending to launch the own ship 20 in the automatic mode, the sub control unit 300 controls the desired rotation direction. While rotating in reverse, the sub drive motor 240 is controlled so that the tension of the first and second sub wire ropes 230a and 230b is released while maintaining 300 kg.

Similarly, if the load applied to the sub-drive motor 240 according to the displacement of the own ship 20 is less than 300 kg, the rotation speed is increased so that the tension of the first and second sub wire ropes 230a and 230b is maintained at 300 kg. , the drive control unit 300 controls the sub-drive motor 240 to stop when the tension is maintained at 300 kg.

When a servo motor is applied as the sub-drive motor 240, the drive control unit 300 includes a command unit 301 that generates a torque command value corresponding to the holding force instructed by the main control unit 191, as shown in FIG. 5. and subtracting the output value of the detection amplifier 306, which amplifies the output value of the current detector 305, which detects the current supplied to the server motor 240a, to the set gain with respect to the torque command value corresponding to the indicated holding force. An error calculation unit 302, a control operation amplifier 303 that amplifies the signal output from the error calculation unit 302 with a set gain, and power corresponding to the signal output from the control operation amplifier 303 is supplied to the servo motor 240a. ) can be constructed with a power conversion unit 304 that converts power to be supplied to.

In addition, when a hydraulic motor is applied as the sub-drive motor 240, the drive control unit 300 includes a command unit ( 311), a hydraulic pump 313 that pumps the hydraulic oil stored in the oil tank 312, a relief valve 314 that returns oil to the oil tank 312 through a bypass path when the pressure exceeds a set level, and a hydraulic pump ( The flow control valve 315 is supplied to the hydraulic motor 240b through the direction control valve 316, which controls the forward and reverse rotation direction by controlling the flow rate of the hydraulic oil supplied by 313) in response to the control signal from the command unit 311. ) and a counterbalance valve 317 that controls the set hydraulic pressure for the hydraulic motor 240b to be maintained.

This control method prevents forward and backward rotation when raising and lowering the own ship (20) and can provide a holding force that keeps the bow or stern in a horizontal state without tilting based on the center of gravity, enabling stable lifting and lowering of the own ship (20). It can provide support and prevent safety accidents by eliminating the need for workers.

According to the ship crane for supporting ship lifting and lowering described above, the first and second sub-wire ropes along with the main wire rope are driven to generate a set supporting force when raising and lowering the ship (high-speed single boat) installed on a medium to large ship serving as a mother ship. This provides the advantage of more stable lifting and lowering operations with three-point support.

110: main body
120: main winch
130: Main wire rope
200: Sub winch unit
220: subbody
240: Sub drive motor
241: Sub drum
243: Path switching roller
280: Sub driving unit

Claims (5)

In the ship crane for supporting the lifting and lowering of the ship's ship, which is installed on the mothership and is capable of lifting or lowering the ship by combining with the main wire rope drawn or wound from the main winch mounted on the main body,
The first and second sub wire ropes are pulled out or wound downward through sub rods extending on both sides along a direction intersecting the transport direction of the main wire rope on the main body, and the own ship is connected to the main wire rope at three points. A ship crane for supporting lifting and lowering of a ship, characterized by further comprising a sub winch unit capable of lifting or lowering in a supported state. The method of claim 1, wherein the sub winch unit
a sub-body mounted on the main body without interfering with the main wire rope, centered on the transfer path of the main wire rope of the main body;
A sub drum on which the first sub wire rope and the second sub wire rope are wound or unwound in a separated state in first and second winding areas defined by a partition on the sub winding shaft rotatably mounted on the sub body; ;
a sub-drive unit that drives the sub-drum to rotate forward and backward;
a path switching roller mounted on the sub-body to change the transfer path of the first and second sub-wire ropes from the sub-drum to a direction toward the extension direction of the sub-rod; Marine crane for lowering support. The apparatus of claim 2, further comprising: a rotation support tube mounted on the sub-body and having a hollow space for rotatably receiving the sub-rod therein;
A longitudinal roller is coupled to the end of the sub-rod and guides the transport path of the first and second sub-wire ropes in a downward direction that intersects the extension direction of the sub-rod;
The sub-rod is a ship crane for supporting ship lifting and lowering, characterized in that the first and second sub-wire ropes are formed in a hollow tube shape so that the first and second sub-wire ropes can be transferred to the longitudinal roller through the inside. The method of claim 3, wherein the path switching roller is aligned in a direction parallel to the extension direction of the sub-rod on the sub-body so that it can be tilted to a position corresponding to a change in the thickness of the first and second sub-wire ropes wound around the sub-drum. A ship crane for supporting ship lifting and lowering, characterized in that it is installed rotatably about a support axis extending in a direction intersecting the tilting hinge in a support bracket installed to rotate around a tilting hinge installed along. The method of claim 2, wherein the sub-driver
a sub-drive motor coupled to the sub-winding shaft to rotate the sub-winding shaft forward and backward;
a control unit provided with a manual control key that allows the user to control forward and reverse rotation of the sub-drive motor, and an automatic mode setting key that instructs an automatic mode to generate a torque corresponding to an automatically set holding force when the own ship is lowered;
A ship crane for supporting ship lifting and lowering, comprising a control unit that controls the sub-drive motor to generate torque corresponding to the set holding force when set to the automatic mode.

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