JP2010006591A - Crane device for marine vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crane device for a marine vessel capable of eliminating marine contamination caused by oil, reducing the number of parts by not requiring an inverter for converting DC power to AC power, simplifying the structure, easily performing manufacture and assembling work, reducing the facility cost, and operating a turning base by accumulated power during an emergency of a marine vessel. <P>SOLUTION: A mounting ring 12 is connected to a crane installing base 11, and an annular rack 13 is connected to the mounting ring 12 by a bolt 14. A turning ring 15 is turnably attached to the annular rack 13 via a bearing 16, and the turning base 17 is connected to the turning ring 15 by a bolt 18. A housing 21 is connected to the turning base 17, and a DC electric motor 23 is mounted at an upper part of the housing 21. A pinion 28 is connected to a rotary shaft 25 of the DC electric motor 23 via a gear speed reduction mechanism 26 and an output shaft 27, and the pinion 28 is meshed with a tooth part 13a of the annular rack 13. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a marine crane apparatus, and more particularly, to an improvement in a swing mechanism of a crane boom having an electric winch for launching a marine lifesaving equipment such as a lifeboat or lifting a cargo. is there.

  In a marine crane device, a swivel that swivels horizontally around a vertical axis is mounted on a crane mount via a swivel support mechanism, and a crane boom is mounted on the swivel. For example, an electric winch for raising and lowering a lifeboat is attached to the crane boom, and a turning mechanism using a hydraulic motor for turning the turntable with respect to the turntable is provided.

  However, in the conventional marine crane apparatus, since a hydraulic motor is used as a power source of a turning mechanism for turning the swivel, there are the following problems. That is, a separate hydraulic circuit for supplying pressure oil to the hydraulic motor is required, which increases the number of parts, making the manufacturing and assembling work cumbersome and making it impossible to reduce equipment costs. In addition, the conventional crane apparatus has a problem that, for example, when the hydraulic circuit is maintained, if the oil leaks from the hydraulic circuit, the ocean may be contaminated. Furthermore, since the conventional hydraulic crane apparatus does not have a margin for the power source that the apparatus alone has, there is a limit to the method of use, and there is no room for retrying when the lifesaving equipment is lowered to the sea.

  In order to solve the problems of the conventional marine crane apparatus, a marine crane apparatus including an electric swing mechanism of a crane boom using an AC electric motor driven by an AC current has also been proposed. The electric turning mechanism converts a direct current voltage charged in a storage battery by a charger into an alternating current by an inverter, then supplies the alternating current to an alternating current electric motor, and turns the crane boom by the motor.

  However, the electric swivel mechanism using the AC electric motor of the conventional marine crane apparatus has the merit of avoiding marine pollution due to oil leakage, but the DC current charged in the storage battery is changed to the AC current. Inverters (power converters) for converting to a power source are required, and there is a problem that the equipment cost cannot be reduced.

  The present invention solves the above-mentioned problems in the prior art, can eliminate marine pollution due to oil, eliminates the need for an inverter for converting direct current into alternating current, and can reduce the number of parts, Ship crane that simplifies the mechanism, facilitates manufacturing and assembly work, reduces equipment costs, and can operate the swivel and crane boom with stored power in case of emergency such as marine accidents To provide an apparatus.

  In order to solve the above-mentioned problems, the invention according to claim 1 is provided such that a swivel that horizontally swivels via a swivel support mechanism is attached to a crane mounting base, a crane boom is attached to the swivel base, The crane boom is equipped with a lifesaving equipment or an electric winch for lifting and lowering a load, and an electric turning mechanism for turning the turntable is provided with respect to the turntable, and a DC electric motor is used as a power source of the electric turn mechanism. The gist is that a direct current is supplied from the storage battery to the direct current electric motor.

  According to a second aspect of the present invention, in the first aspect, the swivel base is provided with a manual swivel mechanism for swiveling the swivel base by manual operation, and before the manual operation of the manual swivel mechanism is started. The gist of the invention is that brake control means for releasing the braking state of the brake mechanism of the DC electric motor and switching the brake mechanism to the braking state after the manual operation of the manual turning mechanism is completed is provided.

  According to a third aspect of the present invention, in the first or second aspect, the swivel support mechanism is fixed to the upper surface of the crane mounting base, and an annular rack having a plurality of teeth on the outer peripheral surface; And a ring-shaped turning ring that supports the turntable and supports the turntable. The electric turning mechanism includes a housing supported by the turntable, A DC electric motor mounted on the upper part of the housing, a speed reduction mechanism provided in the housing, and a pinion connected to the output shaft of the speed reduction mechanism and meshed with the teeth of the rack. This is the gist.

  According to a fourth aspect of the present invention, there is provided the charger according to any one of the first to third aspects, wherein the swivel base is provided with a charger connected to an AC generator. The gist is that a storage battery for storing DC power is connected to the charger.

According to a fifth aspect of the present invention, in the fourth aspect, the storage battery and the charger are configured to operate the charger when the measured value from the sensor that measures the storage amount of the storage battery is lower than the set value. The gist is that a charge control device is provided.
(Function)
According to the present invention, since the electric power charged in the storage battery is supplied to the DC electric motor as a DC current and the crane boom is turned, an inverter for converting the DC current into the AC current becomes unnecessary.

  According to the marine crane apparatus of the present invention, it is possible to eliminate marine pollution due to oil, eliminate the need for an inverter for converting direct current to alternating current, reduce the number of parts, simplify the mechanism, and manufacture In addition, the assembling work can be easily performed, the equipment cost can be reduced, and the swivel base and the crane boom can be operated by the stored electric power in an emergency such as a marine accident of a ship. For this reason, even when the power source of the hull is in a stopped state, lifesaving equipment such as a lifeboat can be launched to the sea.

Hereinafter, an embodiment of a marine crane apparatus embodying the present invention will be described with reference to the drawings.
As shown in FIG. 1, an annular mounting ring 12 is connected to the upper end of a cylindrical crane mounting base 11 installed on the floor F of the ship by welding as shown in FIG. An annular rack 13 having an annular shape is fastened and fixed to the upper surface by bolts 14. A plurality of teeth 13 a are formed on the outer peripheral surface of the annular rack 13, and an annular engagement groove 13 b is formed on the inner peripheral surface of the annular rack 13. An annular swivel ring 15 is mounted on the inner side of the annular rack 13, and is engaged with an annular engagement groove 15a and an engagement groove 13b formed on the outer peripheral surface of the swivel ring 15. The swiveling ring 15 is supported by a ball bearing 16 so as to be able to swivel in the horizontal direction about the center (vertical) axis of the crane mount 11. On the upper surface of the swivel ring 15, a swivel base 17 having a disk shape is fastened and fixed to the swivel ring 15 by bolts 18. A crane boom 19 is connected to the upper surface of the swivel base 17 by welding.

  As shown in FIG. 2, a support plate 20 is horizontally connected to the outer peripheral edge of the swivel base 17 by welding, and a housing 21 is attached to the upper surface of the support plate 20 with bolts 22. A DC electric motor 23 is connected downward to the upper end opening of the housing 21 by a bolt 24. The housing 21 contains a gear reduction mechanism 26 (only one gear is shown) having the rotation shaft 25 of the DC electric motor 23 as an input shaft. The output shaft 27 of the gear reduction mechanism 26 includes A pinion 28 meshed with the tooth portion 13a of the annular rack 13 is fitted and fixed. In this embodiment, an electric turning mechanism 30 is constituted by the housing 21, the DC electric motor 23, the rotating shaft 25, the gear reduction mechanism 26, the output shaft 27, the pinion 28, and the like.

  Therefore, when the rotary shaft 25 of the DC electric motor 23 is rotated, the pinion 28 is rotated through the gear reduction mechanism 26 and the output shaft 27, and revolves along the tooth portion 13a of the outer peripheral portion of the annular rack 13. Then, the swivel base 17 and the crane boom 19 are swung in the horizontal direction together with the electric swivel mechanism 30.

  As shown in FIG. 1, the crane boom 19 includes a vertical portion 19A vertically connected to the upper surface of the swivel base 17, and an inclined portion 19B integrally connected to the upper end portion of the vertical portion 19A in an inclined state. It is comprised by. A housing 31 is attached to a side surface of the vertical portion 19A, and a support shaft 32 is rotatably supported on the housing 31. A reel 33 is fitted and fixed to the support shaft 32. An AC electric motor 34 is attached to the side surface of the housing 31, and a reduction gear mechanism including gears 36 </ b> A, 36 </ b> B, 36 </ b> C, 36 </ b> D is provided between the rotating shaft 35 of the electric motor 34 and the support shaft 32. Intervened. A pulley 37 is attached to the tip of the inclined portion 19B, and a wire 38 wound around the reel 33 is wound around the pulley 37. For example, a life-saving equipment such as a lifeboat or a hook 39 for locking a load is hooked on the tip of the wire 38. When the electric motor 34 is operated and the support shaft 32 is rotated forward and backward, the reel 33 is rotated forward and backward, and the wire 38 is wound up and rewound. In this embodiment, the housing 31, the support shaft 32, the reel 33, the electric motor 34, the rotating shaft 35, the gears 36 </ b> A to 36 </ b> D, the pulley 37, the wire 38, etc. Is configured.

  As shown in FIG. 1, a manual turning mechanism 41 for turning the crane boom 19 by manual operation is mounted on the upper surface of the turntable 17. The manual turning mechanism 41 is fitted and fixed to a housing 42 fixed to the upper surface of the turntable 17, a rotating shaft 43 penetrating and supported by the housing 42 in the vertical direction, and an upper end portion of the rotating shaft 43. A worm wheel 44 and a pinion 45 fitted and fixed to the lower end portion and meshed with the tooth portion 13a of the annular rack 13 are provided. The manual turning mechanism 41 includes a rotating shaft 46 supported by the housing 42 so as to be rotatable in the horizontal direction, a worm 47 fitted and fixed to the rotating shaft 46 and meshed with the worm wheel 44, A prismatic operating shaft 48 connected to the outer end of the rotating shaft 46 is provided. When a manual operation tool (a wrench with a square hole) is fitted to the operation shaft 48 and the operation shaft 48, the rotation shaft 46 and the worm 47 are rotated, the worm wheel 44, the rotation shaft 43 and the pinion 45 are moved. The swivel base 17 is swung together with the crane boom 19 by being rotated.

Next, a control system for controlling various operations of the crane apparatus will be described with reference to FIG.
A charger 51 is mounted on the upper surface of the swivel base 17, and the charger 51 is connected to an AC generator 52. A storage battery 53 is connected to the charger 51. The charger 51 and the storage battery 53 are connected to a charge control device 54 having a computer. The charging control device 54 outputs an operation signal to the charger 51 when a measured value from a sensor (not shown) that measures the charged amount of the storage battery 53 is lower than a set value, and the charger 51 Is to be activated. The DC electric motor 23 is connected to the storage battery 53 via a switch circuit 55. A controller 56 including a computer is connected to the DC electric motor 23 and the switch circuit 55.

  A detection switch 58 that is turned on when the tool is mounted on the operation shaft 48 and turned off when the tool is removed is connected to the control controller 56 by a lead wire 57. . The controller 56 is provided with a manual turning discriminating circuit 59 for outputting a brake release signal or a braking signal from the manual turning discriminating circuit 59 to the electromagnetic brake mechanism 29 of the DC electric motor 23. . In this embodiment, the controller 56, the lead wire 57, the detection switch 58, the manual turning discriminating circuit 59, and the like constitute brake control means for controlling the brake mechanism 29.

  As shown in FIG. 3, on the side surface of the vertical portion 19A of the crane boom 19, an operation box 60 for housing the control controller 56 and the like and instructing various operations of the crane apparatus is mounted. A case 61 for housing the storage battery 53 is mounted on the upper surface of the swivel base 17 as shown in FIG.

Next, the operation of the marine crane apparatus configured as described above will be described.
In FIG. 1, when a start signal is output from the controller 56 to the DC electric motor 23, the brake mechanism 29 is released, the DC electric motor 23 is rotated, and the rotating shaft 25 is rotated, and the gears are rotated. The output shaft 27 and the pinion 28 are rotated via the speed reduction mechanism 26, the pinion 28 is revolved while rotating along the tooth portion 13 a of the annular rack 13, and the swivel base 17 and the crane boom 19 are horizontal together with the electric swing mechanism 30. Turned in the direction. When the crane boom 19 is turned to a preset turning angle, the DC electric motor 23 is stopped by the motor stop signal from the controller 56, and the turning of the turntable 17 and the crane boom 19 is stopped. The brake mechanism 29 is actuated by a braking signal from the controller 56, the rotary shaft 25 of the DC electric motor 23 is locked at a predetermined position, and the crane boom 19 is stopped at the predetermined position.

  In this state, AC current is supplied to the electric motor 34 of the electric winch 40 by an AC generator (not shown) provided on the hull side, the reel 33 is rotated, and the wire 38 is rewound from the reel 33. The lifeboat hung on the hook 39 is launched to the sea. If the hull-side AC generator fails and is in a power failure state, the wire 38 is pulled from the reel 33 by using the weight of the lifeboat while operating the brake mechanism provided in the electric motor 34. The lifeboat is launched to the sea at a speed of.

  On the other hand, when the turning operation of the crane boom 19 by the DC electric motor 23 becomes impossible for some reason, when a tool is mounted on the operation shaft 48 of the manual turning mechanism 41, the manual turning mechanism 41 shown in FIG. The detection switch 58 is turned on, a detection signal is output to the controller 56 through the lead wire 57, a braking release signal is output from the controller 56 to the brake mechanism 29 of the DC electric motor 23, and the braking state of the brake mechanism 29 is released. Is done. In this state, when the rotary shaft 46 is turned by the tool, the swivel base 17 and the crane boom 19 are turned. When the turntable 17 and the crane boom 19 are turned by a predetermined angle, when the rotation of the rotary shaft 46 is stopped manually and the tool is removed from the operation shaft 48, the detection switch 58 of the manual turning mechanism 41 is turned off. Then, a rotation end signal is output to the control controller 56 via the lead wire 57, a braking signal is output from the controller 56 to the brake mechanism 29 of the DC electric motor 23, and the brake mechanism 29 is switched to the braking state. Is held at a predetermined turning position.

According to the marine crane apparatus of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, since the DC electric motor 23 is used as the power source of the electric swing mechanism 30, the current is converted from a DC current to an AC current as compared with the case where an AC electric motor is used. There is no need to provide a power conversion device, the number of parts can be reduced, the mechanism can be simplified, manufacturing and assembly operations can be easily performed, and equipment costs can be reduced. Further, since the number of parts is reduced and the mechanism is simplified, the failure rate in an emergency can be reduced, and the operation reliability of the crane apparatus can be improved. Furthermore, since the DC electric motor 23 is used, marine pollution due to oil leakage can be prevented in advance as compared with the case where a hydraulic motor is used.

  (2) In the above embodiment, the storage battery 53 is connected to the charger 51 connected to the AC generator 52, and a DC current can be supplied from the storage battery 53 to the DC electric motor 23. Even in a state where the power supply 52 is stopped and power supply is disabled, the crane boom 19 can be turned by operating the DC electric motor 23 with the electric power of the storage battery 53. In particular, when a lifeboat such as a lifeboat is lowered from a ship to the ocean by a crane device due to a marine accident, etc., the power supply provided in the hull may be disabled. In other words, the swivel base 17 and the crane boom 19 must be operated with the power stored by the crane device alone. The crane apparatus of this embodiment can cope with this request.

  (3) In the above embodiment, when the operation shaft 48 of the manual turning mechanism 41 is rotated, the braking state of the brake mechanism 29 of the DC electric motor 23 is released, and the pinion 45 is revolved while rotating, and the turntable is rotated. 17 and the crane boom 19 can be swiveled.

  (4) In the above embodiment, since the storage battery 53 is provided, a sufficient margin can be given to the electric power that the crane apparatus can store alone, and trouble occurs when the lifesaving equipment by the crane apparatus is lowered to the sea. Can also retry.

In addition, you may change the said embodiment as follows.
-Instead of the AC generator 52 provided on the hull side as a power source for charging, another power source such as an engine generator or a solar battery panel incorporated in a crane device may be used.

  Although not shown, the brake mechanism 29 provided in the DC electric motor 23 may be omitted, and an electric brake may be provided between the housing 21 or the mounting ring 12 and the turning ring 15 or the turning table 17.

  In place of the gear reduction mechanism 26, another reduction mechanism may be used.

The side view which shows 1 embodiment which actualized the crane apparatus for ships of this invention. The expanded sectional view of a turning support mechanism and an electric turning mechanism. The top view of the crane apparatus for ships. The block circuit diagram of the control system for controlling operation | movement of the crane apparatus for ships.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Crane mounting base, 15 ... Swivel ring, 17 ... Swivel base, 19 ... Crane boom, 21, 31, 42 ... Housing, 23 ... DC electric motor, 27 ... Output shaft, 28, 45 ... Pinion, 29 ... Brake mechanism , 30 ... Electric turning mechanism, 40 ... Electric winch, 41 ... Manual turning mechanism, 51 ... Charger, 52 ... Alternator, 53 ... Storage battery, 54 ... Charge control device.

Claims (5)

The crane mount is equipped with a swivel that rotates horizontally through a swivel support mechanism, a crane boom is mounted on the swivel, and lifesaving equipment or an electric winch for lifting and lowering luggage is mounted on the crane boom. An electric turning mechanism for turning the turntable with respect to the turntable, a direct current electric motor is used as a power source for the electric turn mechanism, and a direct current is supplied from the storage battery to the direct current electric motor. A marine crane device. In Claim 1, the swivel base is provided with a manual swivel mechanism for manually swiveling the swivel base, and before the manual operation of the manual swivel mechanism is started, the brake mechanism of the DC electric motor is A marine crane apparatus, comprising: brake control means for releasing the braking state and switching the brake mechanism to the braking state after the manual operation of the manual turning mechanism is completed. 3. The turning support mechanism according to claim 1, wherein the turning support mechanism is fixed to the upper surface of the crane mounting base, and has an annular rack having a plurality of teeth on the outer peripheral surface, and the inner peripheral surface of the rack is turned through a bearing. The electric swivel mechanism is supported by the ring-shaped swivel ring and supports the swivel base, and the electric swivel mechanism includes a housing supported by the swivel base and a DC electric motor mounted on the top of the housing. A marine crane apparatus comprising: a motor; a speed reduction mechanism provided inside the housing; and a pinion connected to an output shaft of the speed reduction mechanism and meshed with teeth of the rack. . In any one of Claims 1-3, the said turntable is provided with the charger connected to an alternating current generator, This charger is equipped with the function to convert alternating current into direct current, A marine crane apparatus, wherein a battery for storing DC power is connected to the charger. In Claim 4, the said storage battery and charger are provided with the charge control apparatus for operating a charger, when the measured value from the sensor which measures the electrical storage amount of a storage battery falls from a setting value. A marine crane device.

Images