JP6798720B1 - Telescopic actuator for connecting bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic actuator for a connecting bridge capable of efficiently transporting personnel or the like between one side and another side which are separated from each other. SOLUTION: This is a telescopic actuator 30 for a communication bridge 1 that connects a stage 10 on one side and a communication object 7 on the other side that is separated from the stage 10, and the communication bridge 1 is attached to the stage 10. A bridge body 20 including a base end bridge body 21 and movable bridge bodies 22 and 23 that can be expanded and contracted with respect to the base end bridge body 21 is provided. It is a telescopic type telescopic cylinder provided with a plurality of piston rods 32, 33, 34 concentrically provided inside, and the movable bridge bodies 22 and 23 are expanded and contracted by the expansion and contraction actuator 30 driven by hydraulic pressure. Do. [Selection diagram] Fig. 5

Description

The present invention relates to telescopic actuators for connecting bridges.

For example, Patent Document 1 discloses that a self-elevating workbench (SEP: Self Elevating Platform: hereinafter, simply referred to as a workbench) is used when constructing a wind power generation facility at sea. Installation work such as placing foundation piles and assembling offshore wind power generation facilities is carried out using the crane mounted on the workbench. For example, a work cage as in Patent Document 2 is used to transport a worker or the like performing the installation work between the workbench and the wind power generation facility. Patent Document 3 discloses a movable connecting bridge that bridges between a pier and a ship berthed at the pier.

Japanese Unexamined Patent Publication No. 2004-001750 Japanese Unexamined Patent Publication No. 2015-072013 Japanese Unexamined Patent Publication No. 2003-026083

The work cage will be moved between the workbench and the wind farm by the crane mounted on the workbench. The crane is used for the installation work on the offshore wind power generation facility and the transportation work of the work cage, and it is necessary to replace the attachment according to the work each time, so that the work efficiency of the crane is lowered. The movable connecting bridge has a structure in which the crossing distance is short because it is bridged to a ship that has landed near the pier. Therefore, a motor is used as a drive source because a high-power actuator is not required to drive the movable connecting bridge.

Therefore, an object of the present invention is to provide a telescopic actuator for a connecting bridge that can efficiently transport personnel and the like between one side and the other side that are separated from each other.

In order to solve the above problems, the telescopic actuator for the connecting bridge according to one aspect of the present invention is
A telescopic actuator used for a communication bridge that connects a stage on one side and a communication object on the other side that is separated from the stage.
The connecting bridge includes a base end bridge body attached to the stage and a bridge body including a movable bridge body that can be expanded and contracted with respect to the base end bridge body.
The telescopic actuator is a telescopic telescopic cylinder including a telescopic cylinder tube and a plurality of piston rods concentrically provided inside the telescopic cylinder tube, and the movable bridge body is driven by hydraulic pressure. It is characterized in that the expansion / contraction operation is performed by the expansion / contraction actuator.

According to the present invention, a hydraulically driven telescopic actuator allows a heavy and long connecting bridge to be quickly and accurately stretched and contracted between one side and the other side that are separated. Personnel can be transported efficiently.

It is a schematic plan view of the communication bridge which connects the stage of one side and the communication object of the other side which concerns on one Embodiment. It is a schematic side view of FIG. It is a figure explaining expansion / contraction and rotation in a vertical direction of the connecting bridge shown in FIG. It is a figure explaining expansion / contraction and horizontal rotation of the connecting bridge shown in FIG. It is sectional drawing of the telescopic cylinder. It is an enlarged side view of the base end side of a connecting bridge and its periphery. It is an enlarged plan view of the base end side of a connecting bridge and its periphery. It is an enlarged sectional view of the horizontal rotation piston rod of a horizontal rotation actuator and its periphery.

Hereinafter, with reference to the drawings, an embodiment of a connecting bridge 1 according to the present invention, which connects the stage 10 on one side and the offshore wind power generation facility (contact object) 7 on the other side separated from the stage 10. Will be explained.

[Overall structure]
FIG. 1 is a schematic plan view of a connecting bridge 1 that connects a stage 10 on one side and a communication object 7 on the other side that is separated from the stage 10 according to the embodiment. FIG. 2 is a schematic side view of FIG.

The stage 10 located on one side is provided on the workbench 2 and includes a floor portion and a fence portion having a handrail and a support. The workbench 2 is a self-elevating workbench (SEP) including a platform 3 as an offshore structure installed on the ocean, a leg elevating device 4 as a vertical driving means, and a leg 5 as a support pillar. : Self Elevating Platform). The workbench 2 is used as a mooring facility for mooring a vessel, as an offshore wind power generation facility, as a pier for mooring a vessel, or as a maritime heliport. A ship lifter, a crane, and the like are installed on the platform 3.

After towing the workbench 2 to a predetermined installation point, the leg elevating device 4 moves the leg 5 downward relative to the platform 3 at the predetermined installation point. When the tip of the leg of the leg 5 is pushed into the seabed SB, a reaction force from the seabed SB can be obtained, and the platform 3 can be moved above the sea level SL by this reaction force. Platform 3 is lifted to a height that is unaffected by waves (eg about 10 m). By maintaining this state, the self-elevating platform 3 is erected in the ocean. By erecting the self-elevating platform 3 at a position higher than the sea level SL, the platform 3 is less likely to be affected by waves and the like, and is less likely to be shaken.

As shown in FIG. 1, the platform 3 acting as a base portion has a substantially rectangular parallelepiped shape with a low height, is substantially rectangular when viewed from above, and includes an upper plate, a bottom plate, side plates, and a partition plate. The platform 3 is, for example, 120 m in length × 40 m in width × 6 m in height. On platform 3, for example, an 800-ton class vessel can be moored.

Guide holes penetrating in the height direction (vertical direction) of the platform 3 are formed at the four corners of the platform 3. The guide hole has, for example, a rectangular shape so that the square leg 5 can insert the guide hole in the vertical direction. The internal space surrounded by the top plate, the bottom plate, and the side plates is partitioned by a plurality of partition plates.

The internal space of the platform 3 has a watertight structure, and the platform 3 can obtain buoyancy by this watertight structure, and the entire workbench 2 can float on water. Therefore, the workbench 2 can be towed and moved to the installation point while the workbench 2 is floating on the sea surface SL. Further, the workbench 2 can be adapted to be self-propelled and move to the installation point by providing a propulsion device such as a screw propeller.

As shown in FIG. 1, the leg elevating device 4 is attached to the platform 3 as a leg elevating unit so as to surround the guide holes formed at the four corners of the platform 3. The leg 5 supporting the platform 3 is a hollow square (for example, substantially square cross section) steel pipe, for example, 3 m square and 50 m long.

The other side of the communication object 7 in which the stage 10 is provided on the platform 3 of the workbench 2 and is separated from the stage 10 is, for example, an offshore wind power generation facility 7. According to this configuration, by connecting the stage 10 provided on the separated platform 3 and the offshore wind power generation facility with the connecting bridge 1, the workers (personnel) working at the offshore wind power generation facility 7 and the like. Tools can be safely transported. The offshore wind power generation facility 7 works with a foundation support 8 landed on the seabed SB, a nacelle (not shown) attached to the upper part of the foundation support, and a blade (not shown) attached to the nacelle. It has a space 9 for use. The work space 9 is a landing or the like temporarily used by workers who perform installation work or the like.

At the lower part of the foundation support 8, a foundation structure (for example, gravity type, jacket type, tripile type, etc.) for landing on the seabed SB in various modes is used depending on the ground and water depth of the seabed SB. Be done. Since the foundation structure is often wide in the horizontal direction in the sea, the workbench 2 needs to be separated from the offshore wind farm 7. For example, the distance between the workbench 2 and the offshore wind farm 7 is approximately 10 m to 25 m. Work that connects the workbench 2 on one side and the offshore wind power generation facility 7 on the other side, which are far apart in this way, to perform installation work such as installation of the foundation support 8 and assembly of the offshore wind power generation facility 7. The communication bridge 1 is used to transport personnel and the like.

[Connecting bridge]
As shown in FIG. 3, the connecting bridge 1 includes a bridge body 20, a vertical shaft support 13, a horizontal shaft support 80, a telescopic actuator 30, a vertical rotation actuator 17, and a horizontal rotation actuator 70.

A control device that controls various operations of the connecting bridge 1 is electrically connected to the connecting bridge 1. A remote controller in which buttons for electrically controlling the control device are arranged is separately provided. The worker controls various operations of the connecting bridge 1 by operating a wired or wireless remote controller while being located on the tip side of the connecting bridge 1 (the second movable bridge body 23 described later).

The bridge body 20 is made of a material that is lightweight and has high strength, and is made of, for example, a material such as aluminum or an aluminum alloy. The bridge body 20 includes a base end bridge body 21 rotatably attached to the stage 10 and movable bridge bodies 22 and 23 that can be expanded and contracted with respect to the base end bridge body 21. The movable bridge body includes a first movable bridge body 22 on the proximal end side and a second movable bridge body 23 on the distal end side. The first movable bridge body 22 is configured to be stretchable with respect to the base end bridge body 21. The second movable bridge body 23 is configured to be stretchable with respect to the first movable bridge body 22. The base end bridge body 21, the first movable bridge body 22, and the second movable bridge body 23 are a sidewalk portion for workers and the like to pass through, and a fence portion for preventing the passing workers and the like from falling, respectively. And have. As an example, the length of the base end bridge body 21 is about 10 m, the lengths of the first movable bridge body 22 and the second movable bridge body 23 are each about 7.5 m, and the bridge body 20 is It can expand and contract in the range of about 10m to 25m.

The base end portion of the base end bridge body 21 is rotatably supported in the vertical direction by the vertical shaft support portion 13 and the vertical rotation shaft 14 provided at the lower part of the stage 10. A vertical support portion 18 is provided in a portion of the base end bridge body 21 near the base end. A telescopic cylinder support portion 25 is provided in a portion of the base end bridge body 21 near the tip end.

A cylinder tip support portion 28 is provided at a portion closer to the tip of the second movable bridge body 23 located on the most tip side of the movable bridge body. A tip engaging portion 26 is provided in a portion of the lower portion of the second movable bridge body 23 on the tip end side. The tip engaging portion 26 is a hook that protrudes toward the tip side and has a hook shape so as to engage with the work space (contact target point) 9 of the offshore wind power generation facility (communication target) 7 on the other side. It is configured in.

The stage 10 is erected on the platform (base portion) 3 of the workbench 2, and a storage box 11 is continuously provided below the stage 10. A heavy object such as a horizontal rotation actuator 70 and a hydraulic pressure generator 89 is stored in the storage box 11. The hydraulic pressure generator 89 includes a control valve, a pump, and a tank for driving the vertical rotation actuator 17 and the telescopic actuator 30 with hydraulic pressure. On the opposite side of the connecting bridge 1 in the stage 10, a hydraulic pressure generator 89, which is a heavy object, is arranged. According to this configuration, the weight can be balanced with the bridge body 20, which contributes to the stabilization of the rotation of the bridge body 20.

On the opposite side of the connecting bridge 1 in the stage 10, a staircase 12 for going up and down the stage 10 is attached. According to this configuration, the weight can be balanced with the bridge body 20, which contributes to the stabilization of the rotation of the bridge body 20. Although the stairs 12 are integrally attached to the stage 10, they are separated from the platform (base portion) 3. Therefore, the stage 10 rotates in the horizontal direction integrally with the stairs 12 and the storage box 11.

A vertical rotating cylinder support portion 15 is provided in the lower portion of the storage box 11. The vertical rotation cylinder 17 is rotatably supported by the vertical rotation cylinder support shaft 16 inserted through the vertical rotation cylinder support portion 15. The tip of the vertical rotation cylinder 17 is connected to the vertical support portion 18.

The vertical rotation cylinder 17 acts as a vertical rotation actuator and is driven by hydraulic pressure (for example, oil pressure) from the hydraulic pressure generator 89. The vertical rotation cylinder 17 is configured to rotate the bridge body 20 at an angle of 20 degrees upward with respect to the horizontal direction and at an angle of 20 degrees downward with respect to the horizontal direction, for example. ing.

[Expandable actuator in connecting bridge]
A telescopic cylinder 30 is provided so that the movable bridge bodies 22 and 23 can be expanded and contracted with respect to the base end bridge body 21. The telescopic cylinder 30 acts as a telescopic actuator and is driven by hydraulic pressure (for example, flood control) from the hydraulic pressure generator 89. The telescopic cylinder 30 is supported by the telescopic cylinder support portion 25. The tip of the telescopic cylinder 30 is connected to the cylinder tip support 28. Therefore, when the telescopic cylinder 30 protrudes, the movable bridge bodies 22 and 23 are in the extended state, and the length of the bridge body 20 becomes long. On the other hand, when the telescopic cylinder 30 contracts, the movable bridge bodies 22 and 23 are immersed, and the length of the bridge body 20 is shortened.

As shown in FIG. 5, the telescopic cylinder 30 is a telescopic type including a telescopic cylinder tube 31 and a plurality of piston rods 32, 33, 34 concentrically provided inside the telescopic cylinder tube 31. The telescopic cylinder 30 includes, for example, a first piston rod 32, a second piston rod 33, and a third piston rod 34.

On the base end side of the cylindrical telescopic cylinder tube 31 forming the outer shell of the telescopic cylinder 30 (left side in FIG. 5), the base end of the telescopic cylinder tube 31 is closed by the end cover 31c. .. The tip side of the telescopic cylinder tube 31 on the rod side (right side in FIG. 1) is open.

A double-cylindrical first piston rod 32 is inserted inside the telescopic cylinder tube 31 so as to be movable in the cylinder axial direction. Inside the first piston rod 32, a double cylindrical second piston rod 33 is inserted so as to be movable in the cylinder axial direction. Inside the second piston rod 33, a columnar third piston rod 34 is inserted so as to be movable in the cylinder axial direction. Therefore, the telescopic cylinder 30 of the present embodiment is a telescopic multi-stage cylinder in which the first piston rod 32, the second piston rod 33, and the third piston rod 34 are concentrically incorporated in the telescopic cylinder tube 31. According to this configuration, it is easy to increase the number of stages of the piston rods 32, 33, 34 while suppressing the length of the telescopic cylinder tube 31, and the telescopic cylinder 30 can be easily lengthened. The telescopic cylinder 30 changes from the contracted state shown by the solid line in FIG. 3 to the extended state shown by the alternate long and short dash line due to the protrusion of the piston rods 32, 33, and 34.

On each base end side of the first piston rod 32, the second piston rod 33, and the third piston rod 34, the first head side pressure chamber 41, the second head side pressure chamber 42, and the third head side pressure chamber 43 are respectively. It is formed.

The first piston rod 32 has a first piston 32a, a first cylinder tube 32b, and a first end cover 32c. A known sealing member is attached to the outer peripheral portion of the first piston 32a.

The second piston rod 33 has a second piston 33a, a second cylinder tube 33b, and a second end cover 33c. A known sealing member is attached to the outer peripheral portion of the second piston 33a.

The third piston rod 34 has a third piston 34a and a tip piston rod 34b. A known sealing member is attached to the outer peripheral portion of the third piston 34a.

The telescopic cylinder tube 31, the first piston rod 32, the second piston rod 33, and the third piston rod 34 are made of, for example, steel. As an example, each cylinder stroke of the first piston rod 32, the second piston rod 33, and the third piston rod 34 is about 5 m, and the expansion / contraction length of the expansion / contraction cylinder 30 is about 15 m. Further, as an example, the inner diameter of the telescopic cylinder tube 31 is about 170 mm, the outer diameter of the first piston rod 32 is about 150 mm, the inner diameter of the first cylinder tube 32b is about 100 mm, and the second piston rod 33 The outer diameter is about 85 mm, the inner diameter of the second cylinder tube 33b is about 50 mm, and the outer diameter of the third piston rod 34 is about 35 mm.

A head-side port 35 is formed on the base end side of the end cover 31c, and a pipe (not shown) for supplying and discharging hydraulic fluid (hydraulic oil) is connected. The head-side port 35 communicates with the first head-side pressure chamber 41 through the first through hole 45. The first head-side pressure chamber 41 communicates with the second head-side pressure chamber 42 through the second through hole 46. The second head-side pressure chamber 42 communicates with the third head-side pressure chamber 43 through the third through hole 47.

Therefore, the first head side pressure chamber 41 communicates with the third head side pressure chamber 43 through the second through hole 46, the second head side pressure chamber 42, and the third through hole 47. The first head-side pressure chamber 41, the second head-side pressure chamber 42, and the third head-side pressure chamber 43 function as head-side pressure chambers.

According to this configuration, the head-side pressure chambers 41, 42, and 43 can communicate with each other with a simple structure.

When hydraulic pressure is applied to the first head-side pressure chamber 41 while the piston rods 32, 33, and 34 are immersed, the first head-side pressure chamber 41 is expanded, and the second head-side pressure chamber 42 and the second head-side pressure chamber 41 are expanded. The pressure chamber 43 on the 3 head side is also expanded. The expansion of the head-side pressure chambers 41, 42, 43 attempts to extend the piston rods 32, 33, 34, so that the telescopic cylinder 30 is in a protruding state.

A first rod-side pressure chamber 51 is formed between the telescopic cylinder tube 31 and the first piston rod 32. A second rod-side pressure chamber 52 is formed between the first piston rod 32 and the second piston rod 33. A third rod-side pressure chamber 53 is formed between the second piston rod 33 and the third piston rod 34.

A rod-side pipe having a rod-side port 36 is connected to the outer peripheral portion of the telescopic cylinder tube 31, and hydraulic fluid (hydraulic oil) is supplied and discharged via the rod-side pipe. The rod-side port 36 communicates with the first rod-side pressure chamber 51 via a rod-side pipe and an outer through hole 48.

The first piston rod 32 has a double cylindrical structure including a first outer cylinder and a first inner cylinder. In the double cylindrical structure, the first rod side communication passage 55 is formed. The first rod-side communication passage 55 includes a first head-side through hole 55b located outside the base end side, a first rod-side through hole 55c located inside the tip end side, a first head-side through hole 55b, and the like. It is composed of a first connection passage 55a communicating with the first rod side through hole 55c. The outer through hole 48 communicates with the first head side through hole 55b via the first rod side pressure chamber 51.

The second piston rod 33 has a double cylindrical structure including a second outer cylinder and a second inner cylinder. In the double cylindrical structure, the second rod side continuous passage 56 is formed. The second rod-side communication passage 56 includes a second head-side through hole 56b located on the outside of the base end side, a second rod-side through hole 56c located on the inside of the tip end side, a second head-side through hole 56b, and the like. It is composed of a second connection passage 56a communicating with the second rod side through hole 56c. The first rod-side through hole 55c communicates with the second head-side through hole 56b via the second rod-side pressure chamber 52. The second head side through hole 56b communicates with the third rod side pressure chamber 53.

Therefore, the first rod-side pressure chamber 51 communicates with the third rod-side pressure chamber 53 via the first rod-side communication passage 55, the second rod-side pressure chamber 52, and the second rod-side communication passage 56. .. The first rod-side pressure chamber 51, the second rod-side pressure chamber 52, and the third rod-side pressure chamber 53 act as rod-side pressure chambers.

When the piston rods 32, 33, 34 are extended, the internal volumes of the rod-side pressure chambers 51, 52, 53 are small. Further, the first rod-side communication passage 55 connects the first rod-side through hole 55c, the first head-side through-hole 55b, the first rod-side through-hole 55c, and the first head-side through-hole 55b. A passage 55a is provided, and the second rod-side continuous passage 56 includes a second rod-side through hole 56c, a second head-side through hole 56b, a second rod-side through hole 56c, and a second head-side through hole 56b. It is provided with a second connection passage 56a to be connected.

When hydraulic pressure is applied to the first rod-side pressure chamber 51, the first rod-side pressure chamber 51 is expanded, and the second rod-side pressure chamber 52 and the second rod-side pressure chamber 52 and the second through the first connection passage 55a and the second connection passage 56a. 3 Each rod-side pressure chamber 53 is expanded. Since the expansion of the rod-side pressure chambers 51, 52, 53 works in the direction of immersing the piston rods 32, 33, 34, the telescopic cylinder 30 is in a contracted state. According to this configuration, since the telescopic cylinder 30 contracts under hydraulic pressure, the contraction operation is performed more reliably and strongly than other configurations in which the contraction operation is performed by the own weight of each piston rod 32, 33, 34. Can be done. In particular, it is effective when the contraction operation due to its own weight does not work, that is, when the bridge body 20 and the telescopic cylinder 30 extend downward from the horizontal direction.

In the pressure chamber 51 on the first rod side, the first ridge 61 is provided on the base end side of the first cylinder tube 32b, and the first stopper 62 is provided on the tip end side of the telescopic cylinder tube 31. When the first ridge 61 comes into contact with the first stopper 62, the protruding operation of the first piston rod 32 is stopped.

In the pressure chamber 52 on the second rod side, the second ridge 63 is provided on the base end side of the second cylinder tube 33b, and the second stopper 64 is provided on the tip end side of the first cylinder tube 32b. .. When the second ridge 63 comes into contact with the second stopper 64, the protruding operation of the second piston rod 33 is stopped.

In the pressure chamber 53 on the third rod side, the third ridge 65 is provided on the tip end side of the third piston 34a, and the third stopper 66 is provided on the proximal end side of the second piston rod 33. When the third ridge 65 comes into contact with the third stopper 66, the protruding operation of the third piston rod 34 is stopped.

A hydraulic circuit (not shown) is connected to the telescopic cylinder 30. The hydraulic circuit includes a head-side pipe, a rod-side pipe, a direction switching valve as a control valve, a pump, a tank, and the like. One end of the head-side pipe is connected to the head-side port 35, and one end of the rod-side pipe is connected to the rod-side port 36. The other ends of the head-side piping and the rod-side piping are connected to the directional control valve. The pump and the tank are connected to the directional control valve, and the head-side pipe and the rod-side pipe are selectively connected to the pump or the tank via the directional control valve. That is, the directional control valve can be switched between the neutral position, the switching position on the head side, and the switching position on the rod side. In the neutral position, neither the head side pipe nor the rod side pipe is connected to the pump or the tank. At the switching position on the head side, the head side pipe is connected to the pump and the rod side pipe is connected to the tank. At the switching position on the rod side, the head side pipe is connected to the tank and the rod side pipe is connected to the pump.

Next, the expansion / contraction operation of the expansion / contraction cylinder 30 will be described.

By setting the direction switching valve to the switching position on the head side, the hydraulic fluid (for example, hydraulic oil) is supplied from the head side port 35 in the contracted state of the telescopic cylinder 30 in which the piston rods 32, 33, and 34 are immersed. The hydraulic fluid is supplied to the pressure chamber 41 on the first head side through the first through hole 45, and the piston rods 32, 33, and 34 integrally project, but the first piston rod 32 having a large pressure receiving area Mainly the protruding movement of. When the first ridge 61 comes into contact with the first stopper 62, the protruding operation of the first piston rod 32 is stopped.

Subsequently, the protruding operation of the second piston rod 33 having a large pressure receiving area is mainly performed, and when the second ridge 63 comes into contact with the second stopper 64, the protruding operation of the second piston rod 33 is stopped. Finally, the third piston rod 34 having a small pressure receiving area performs a protruding operation, and the third ridge 65 comes into contact with the third stopper 66, so that the protruding operation of the third piston rod 34 is stopped. As a result, the telescopic cylinder 30 is in the most extended protruding state. The working fluid discharged from the rod side port 36 is collected in the tank.

By setting the direction switching valve to the switching position on the rod side, the hydraulic fluid (for example, hydraulic oil) is supplied from the rod side port 36 in the protruding state of the telescopic cylinder 30 in which the piston rods 32, 33, and 34 are extended. The hydraulic fluid is supplied to the pressure chamber 51 on the first rod side through the outer through hole 48, and the piston rods 32, 33, and 34 integrally perform the immersion operation, but the first piston rod 32 having a large pressure receiving area Mainly immersive movement. The hydraulic fluid stored in the pressure chamber 41 on the first head side is discharged from the port 35 on the head side, and the first end cover 32c comes into contact with the end cover 31c, so that the immersion operation of the first piston rod 32 is stopped. To do.

Subsequently, the immersion operation of the second piston rod 33 having a large pressure receiving area is mainly performed, the hydraulic fluid stored in the pressure chamber 42 on the second head side is discharged from the port 35 on the head side, and the second end cover 33c is the first end. By contacting the portion cover 32c, the immersion operation of the second piston rod 33 is stopped. Finally, the third piston rod 34 having a small pressure receiving area performs an immersion operation, the hydraulic fluid stored in the third head side pressure chamber 43 is discharged from the head side port 35, and the third piston 34a covers the second end portion. By contacting the 33c, the immersion operation of the third piston rod 34 is stopped. As a result, the telescopic cylinder 30 is in the most immersive contracted state. The working fluid discharged from the head side port 35 is collected in the tank.

According to the above configuration, by applying hydraulic pressure to the head-side pressure chambers 41, 42, 43, the piston rods 32, 33, 34 sequentially project, and the rod-side pressure chambers 51, 52, 53 are moved. By applying the hydraulic pressure, the piston rods 32, 33, and 34 sequentially perform the immersion operation, so that the expansion / contraction operation of the expansion / contraction cylinder 30 can be easily switched.

The tip engaging portion 26 is engaged with the contact point, and the bridge body 20 in a protruding state due to the extension of the piston rods 32, 33, 34 receives a large external force (for example, wind power). It may sway or twist. In such a case, in order to prevent an excessive load from acting on the piston rods 32, 33, and 34, the direction switching valve is set to the neutral position so that the head side piping and the rod side piping are separated from the pump and the tank. It is blocked. As a result, the hydraulic fluid is not supplied or discharged to the head-side pressure chambers 41, 42, 43 and the rod-side pressure chambers 51, 52, 53, and the telescopic cylinder 30 and the bridge body 20 are in a state where no hydraulic pressure is applied. Position is maintained. Therefore, even if a large external force acts, the expansion / contraction cylinder 30 can be prevented from being damaged by buffering the external force.

[Horizontal rotation actuator in connecting bridge]
The horizontal rotation actuator 70 in the connecting bridge 1 will be described with reference to FIGS. 6, 7, and 8.

A horizontal rotation actuator 70 is provided to rotate the stage 10 to which the bridge body 20 is connected in the horizontal direction. The horizontal rotation actuator 70 includes a double-acting horizontal rotation cylinder 71, a pinion 86 attached to the horizontal shaft support 80, and a rack 85 provided on the horizontal rotation cylinder tube 74 of the horizontal rotation cylinder 71. Be prepared. According to this configuration, the connecting bridge 1 which is a large load can be rotated by utilizing the large driving force of the horizontal rotating cylinder 71.

The horizontal shaft branch 80 is integrally (fixed) erected with respect to the platform (base portion) 3 facing the stage 10. The horizontal shaft branch 80 is housed in a storage box 11 attached to the lower part of the stage 10, but is separate from the storage box 11. A pinion 86, which is a small gear that meshes with the rack 85, is integrally (fixed) attached to the central portion of the horizontal shaft support portion 80 in the axial direction.

The stage 10 and the storage box 11 are rotatably supported with respect to the horizontal shaft support portion 80 via the upper bearing portion 82 and the lower bearing portion 83. The upper bearing portion 82 is, for example, a thrust bearing that supports an axial load. The lower bearing portion 83 is, for example, a radial ball bearing. The hydraulic pressure generator 89 is fixed to the base of the storage box 11 inside the storage box 11. A roller 88 is provided at the bottom of the stage 10, that is, at the bottom of the storage box 11. According to this configuration, the stage 10 and the storage box 11 can be smoothly rotated in the horizontal direction. The rollers 88 are provided on the side of the base end bridge body 21 and on the opposite side of the base end bridge body 21 with the horizontal rotation shaft 81 interposed therebetween.

The horizontal rotation cylinder 71 includes a horizontal rotation cylinder tube 74, two horizontal rotation piston rods 72, a horizontal rotation piston 78, a rack 85, and a horizontal rotation hydraulic pressure generator 73. Inside, the horizontal rotating cylinder tube 74 has a hollow cylindrical horizontal rotating cylinder chamber 76 on one side and the other side in the axial direction. The horizontal rotation piston 78 is provided so as to reciprocate in the axial direction in the horizontal rotation cylinder tube 74.

Horizontally rotating piston rods 72 extending in the axial direction are provided on one side and the other side of the horizontally rotating piston 78 in the axial direction. Inside the horizontally rotating piston rods 72 on one side and the other side, circulation passages 75 extending in the axial direction are formed, respectively. The distribution passage 75 is configured to connect the plurality of communication portions 77 and the port 79. The communication portion 77 is provided on the side of the horizontally rotating piston 78 and extends in the radial direction. The port 79 is provided at the opposite end of the horizontal rotating piston 78. According to this configuration, the length of the horizontally rotating cylinder tube 74 can be effectively used as compared with the case where the port 79 is provided on the outer peripheral portion of the horizontally rotating cylinder tube 74, so that the rack 85 provided on the horizontally rotating cylinder tube 74 can be used. The linear movement distance can be increased, and the rotation angle of the stage 10 can be increased.

The horizontal rotation hydraulic pressure generator 73 on one side and the other side is connected to the corresponding ports 79 on the one side and the other side, respectively. The horizontal rotation hydraulic pressure generator 73 on one side and the other side is fixed to a base provided inside the storage box 11. The horizontal rotation hydraulic pressure generator 73 on one side and the other side communicates with the horizontal rotation cylinder chamber 76 on one side and the other side, respectively, via the corresponding port 79, the flow passage 75, and the plurality of communication portions 77. doing. The horizontal rotation hydraulic pressure generator 73 on one side and the other side includes a direction switching valve, a pump, and a tank for driving the horizontal rotation cylinder 71 with hydraulic pressure. The directional control valve can be switched between a neutral position, an open position, and a closed position.

The rack 85 is integrally (fixed) attached to the side surface of the horizontally rotating cylinder tube 74. The rack 85 is a linear gear that meshes with the pinion 86.

When the hydraulic pressure is applied from the port 79 on one side with the direction switching valve on one side open, the horizontal rotation cylinder chamber 76 on one side expands. A horizontal rotation piston 78 is connected to a horizontal rotation hydraulic pressure generator 73 fixed to the storage box 11 on one side and the other side via a horizontal rotation piston rod 72. Therefore, even if the horizontal rotation cylinder chamber 76 on one side is expanded, the position of the horizontal rotation piston 78 does not change. On the contrary, the horizontally rotating cylinder tube 74 is not fixed to the storage box 11 and is free. Therefore, when the horizontal rotating cylinder chamber 76 on one side expands, the horizontal rotating cylinder tube 74 moves relatively toward one side in the axial direction. As the horizontally rotating cylinder tube 74 moves to one side, the rack 85 moves to one side in the axial direction. That is, the rack 85 makes a linear motion.

The rack 85 provided on the side of the stage 10 and the storage box 11 meshes with the pinion 86 provided on the side of the horizontal shaft branch 80, and the stage 10 and the storage box 11 are engaged in the horizontal shaft branch 80. It is rotatably supported. The linear motion of the rack 85 is converted into the rotational motion of the pinion 86, but since the side of the rack 85 is rotatable and the side of the pinion 86 is not rotatable, the side of the rack 85 is rotated. Therefore, the stage 10 and the storage box 11 on the side of the rack 85 rotate about the horizontal rotation shaft 81.

Similarly, when the directional control valve on the other side is opened and hydraulic pressure is applied from the port 79 on the other side, the horizontal rotation cylinder chamber 76 on the other side expands, so that the horizontal rotation cylinder tube 74 and the rack 85 are opened. Move to the other side in the axial direction. The linear motion of the rack 85 is converted into the rotational motion of the stage 10 and the storage box 11.

The horizontal rotation cylinder 71, the horizontal shaft support 80, the pinion 86, and the rack 85 act as the horizontal rotation actuator 70. The rack 85 is linearly driven by the hydraulic pressure (for example, flood control) from the horizontal rotation hydraulic pressure generator 73. The horizontal rotation actuator 70 rotates the stage 10 and the bridge body 20, for example, at an angle of 140 degrees in the horizontal direction.

The bridge body 20 in which the tip engaging portion 26 is engaged with the contact point may swing or twist due to a large external force (for example, wind power). In such a case, the direction switching valve can be set to the neutral position in order to prevent an excessive load from acting on the horizontal rotating cylinder 71. As a result, the hydraulic fluid is not supplied or discharged to the horizontal rotating cylinder chamber 76 on one side and the horizontal rotating cylinder chamber 76 on the other side, and the horizontal rotating cylinder 71 and the bridge are in a state where no hydraulic pressure is applied. The position of the body 20 is maintained. Therefore, even if a large external force acts, the horizontal rotating cylinder 71 can be prevented from being damaged by buffering the external force.

According to the above configuration, the telescopic actuator 30, the vertical rotation actuator 17, and the horizontal rotation actuator 70 driven by hydraulic pressure can move the heavy and long connecting bridge 1 quickly and accurately. Personnel can be efficiently transported between one side and the other side that are separated.

Although specific embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

The number of stages of the piston rods of the movable bridge body and the telescopic cylinder 30 is appropriately determined according to the distance between the stage 10 on one side and the communication object 7 on the other side. Further, the rotation angle of the bridge body 20 by the vertical rotation cylinder 17 and the horizontal rotation actuator 70 is appropriately determined according to the positional relationship between the stage 10 on one side and the communication object 7 on the other side. Cylinder.

The relationship between the stage 10 on one side and the contact object 7 on the other side can be applied to various things. For example, the stage 10 on one side may be provided on the self-elevating workbench 2 and the contact object 7 on the other side may be a vessel such as a tugboat located around the self-elevating workbench 2. it can. Further, for example, the stage 10 on one side can be provided above the offshore wind power generation facility, and the other side can be a ship (contact object) such as a berthing space or a tugboat provided below the offshore wind power generation facility. .. Further, the bridge body 20 can be formed in a staircase shape that facilitates movement in the vertical direction. When not in use, the bridge body 20 is placed in a shunting state in which it is shunted upward, while when in use, the bridge body 20 can be switched to a bridged state in which it is lowered, so that non-related persons can carelessly move to an offshore wind power generation facility. You can prevent climbing. Such a configuration can also be applied to tall steel towers such as power transmission towers. In the case of a steel tower, the stage 10 on one side can be provided above the legs of the tower, and the other side can be the ground or foundation (contact object) located below the tower.

The present invention and embodiments can be summarized as follows.

The telescopic actuator 30 for the connecting bridge 1 according to one aspect of the present invention is
A telescopic actuator 30 used for a communication bridge 1 that connects a stage 10 on one side and a communication object 7 on the other side that is separated from the stage 10.
The connecting bridge 1 includes a bridge body 20 including a base end bridge body 21 attached to the stage 10 and movable bridge bodies 22 and 23 that can be expanded and contracted with respect to the base end bridge body 21.
The telescopic actuator 30 is a telescopic telescopic cylinder including a telescopic cylinder tube 31 and a plurality of piston rods 32, 33, 34 concentrically provided inside the telescopic cylinder tube 31, and is a movable bridge body. 22 and 23 are characterized in that the expansion / contraction operation is performed by the expansion / contraction actuator 30 driven by hydraulic pressure.

According to the above configuration, the telescopic actuator 30 driven by hydraulic pressure can quickly and accurately expand and contract the heavy and long connecting bridge 1, so that one side and the other side that are separated from each other can be expanded and contracted quickly and accurately. Personnel can be efficiently transported between them.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
The telescopic cylinder 30 has head-side pressure chambers 41, 42, 43 for projecting the piston rods 32, 33, 34 at the head-side ends of the piston rods 32, 33, 34, and the piston rods 32, 33. , 34, the rod-side pressure chambers 51, 52, 53 for immersing the piston rods 32, 33, 34 and the head-side pressure chambers 41, 42, 43, respectively, in the outer peripheral portion of the head-side pressure chambers 41, 42, 43. , 47, and rod-side communication passages 55, 56 that communicate with each of the rod-side pressure chambers 51, 52, and 53.

According to the above embodiment, by applying hydraulic pressure to the head side pressure chambers 41, 42, 43, the piston rods 32, 33, 34 sequentially protrude, and the rod side pressure chambers 51, 52, 53. By applying hydraulic pressure to the piston rods 32, 33, and 34, the piston rods 32, 33, and 34 sequentially perform immersion operations, so that the expansion and contraction operations of the expansion and contraction cylinder 30 can be easily switched.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
The rod-side communication passages 55 and 56 connect the rod-side through holes 55c and 56c, the head-side through holes 55b and 56b, the rod-side through holes 55c and 56c, and the head-side through holes 55b and 56b. It includes 55a and 56a.

According to the above embodiment, since the telescopic cylinder 30 contracts by hydraulic pressure, the contraction operation is performed more reliably and strongly than other configurations in which the contraction operation is performed by the own weight of each piston rod 32, 33, 34. be able to.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
The head-side communication passages 46, 47 are through holes 46, 47 penetrating the head-side ends of the piston rods 32, 33, 34.

According to the above embodiment, the head-side pressure chambers 41, 42, and 43 can communicate with each other with a simple structure.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
On the opposite side of the connecting bridge 1 in the stage 10, a hydraulic pressure generator 89 for generating the hydraulic pressure is provided.

According to the above embodiment, the weight can be balanced with the bridge body 20, which contributes to the stabilization of the rotation of the bridge body 20.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
On the opposite side of the connecting bridge 1 in the stage 10, a staircase 12 for going up and down the stage 10 is attached.

According to the above embodiment, the weight can be balanced with the bridge body 20, which contributes to the stabilization of the rotation of the bridge body 20.

Further, in the telescopic actuator 30 for the connecting bridge 1 of one embodiment,
The stage 10 is provided on the self-elevating workbench 2, and the communication object 7 is an offshore wind power generation facility 7.

According to the above embodiment, a worker (personnel) working at the offshore wind power generation facility 7 by connecting the stage 10 of the self-elevating workbench 2 and the offshore wind power generation facility 7 which are separated from each other by the connecting bridge 1. ) And tools can be transported safely.

1 ... Communication bridge 2 ... Workbench 3 ... Platform (base)
4 ... Leg lifting device 5 ... Leg 7 ... Offshore wind power generation facility (contact object)
8 ... Basic support 9 ... Working space 10 ... Stage 11 ... Storage box 12 ... Stairs 13 ... Vertical shaft branch 14 ... Vertical rotation shaft 15 ... Vertical rotation cylinder support 16 ... Vertical rotation cylinder support shaft 17 ... Vertical Rotating cylinder (vertical rotating actuator)
18 ... Vertical support 20 ... Bridge body 21 ... Base end bridge body 22 ... First movable bridge body (movable bridge body)
23 ... Second movable bridge body (movable bridge body)
25 ... Telescopic cylinder support 26 ... Tip engaging part 28 ... Cylinder tip support 30 ... Telescopic cylinder (expansion actuator)
31 ... Telescopic cylinder tube 31c ... End cover 32 ... First piston rod (piston rod)
32a ... 1st piston 32b ... 1st cylinder tube 32c ... 1st end cover 33 ... 2nd piston rod (piston rod)
33a ... 2nd piston 33b ... 2nd cylinder tube 33c ... 2nd end cover 34 ... 3rd piston rod (piston rod)
34a ... Third piston 34b ... Tip piston rod 35 ... Head side port 36 ... Rod side port 41 ... First head side pressure chamber (head side pressure chamber)
42 ... Second head side pressure chamber (head side pressure chamber)
43 ... Third head side pressure chamber (head side pressure chamber)
45 ... 1st through hole 46 ... 2nd through hole (head side continuous passage)
47 ... Third through hole (head side continuous passage)
48 ... External through hole 51 ... First rod side pressure chamber (rod side pressure chamber)
52 ... Second rod side pressure chamber (rod side pressure chamber)
53 ... Third rod side pressure chamber (rod side pressure chamber)
55 ... 1st rod side passage (rod side passage)
55a ... 1st connection passage (connection passage)
55b ... First head side through hole (head side communication hole)
55c ... First rod side through hole (rod side communication hole)
56 ... 2nd rod side passage (rod side passage)
56a ... Second connection passage (connection passage)
56b ... Second head side through hole (head side communication hole)
56c ... Second rod side through hole (rod side communication hole)
61 ... 1st ridge 62 ... 1st stopper 63 ... 2nd ridge 64 ... 2nd stopper 65 ... 3rd ridge 66 ... 3rd stopper 70 ... Horizontal rotation actuator 71 ... Horizontal rotation cylinder 72 ... Horizontal rotation Piston rod 73 ... Horizontal rotation hydraulic pressure generator 74 ... Horizontal rotation cylinder tube 75 ... Flow passage 76 ... Horizontal rotation cylinder chamber 77 ... Communication part 78 ... Horizontal rotation piston 79 ... Port 80 ... Horizontal shaft branch 81 ... Horizontal Rotating shaft 82 ... Bearing part 83 ... Bearing part 85 ... Rack 86 ... Pinion 88 ... Roller 89 ... Hydraulic pressure generator SB ... Submarine SL ... Sea surface

Claims (7)

A telescopic actuator used for a communication bridge that connects a stage on one side and a communication object on the other side that is separated from the stage.
The connecting bridge includes a base end bridge body attached to the stage and a bridge body including a movable bridge body that can be expanded and contracted with respect to the base end bridge body.
The telescopic actuator is a telescopic telescopic cylinder including a telescopic cylinder tube and a plurality of piston rods concentrically provided inside the telescopic cylinder tube, and the movable bridge body is driven by hydraulic pressure. A telescopic actuator for a connecting bridge, characterized in that a telescopic operation is performed by the telescopic actuator. The telescopic cylinder has a head-side pressure chamber for projecting the piston rod at the head-side end of the piston rod, a rod-side pressure chamber for immersing the piston rod at the outer peripheral portion of the piston rod, and the above. The telescopic actuator for a connecting bridge according to claim 1, further comprising a head-side communication passage that communicates with each of the head-side pressure chambers and a rod-side communication passage that communicates with each of the rod-side pressure chambers. .. The second aspect of the present invention, wherein the rod-side continuous passage includes a rod-side through hole, a head-side through hole, and a connection passage connecting the rod-side through hole and the head-side through hole. Telescopic actuator for connecting bridges. The telescopic actuator for a connecting bridge according to claim 2 or 3, wherein the head-side continuous passage is a through hole penetrating the head-side end of the piston rod. The connecting bridge according to any one of claims 1 to 4, wherein a hydraulic pressure generator for generating the hydraulic pressure is provided on the opposite side of the connecting bridge in the stage. Telescopic actuator for. The connecting bridge according to any one of claims 1 to 5, wherein a staircase for going up and down the stage is attached to the opposite side of the connecting bridge in the stage. Telescopic actuator for. The communication bridge according to any one of claims 1 to 6, wherein the stage is provided on a self-elevating workbench and the communication object is an offshore wind power generation facility. Telescopic actuator for.

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