JP2022036490A - Vessel deck crane overturning prevention mechanism - Google Patents

Abstract

To provide a vessel deck crane overturning prevention mechanism capable of preventing overturning of a jib provided to a revolving superstructure, which is caused by waves.SOLUTION: A vessel deck crane 1 comprises: a revolving superstructure 11; a jib 12 provided to the revolving superstructure 11; and a winch 13 for raising/lowering the jib 12 connected to a wire WR. An overturning prevention device 3 of the vessel deck crane 1 comprises a support member 4, and an abutment member 5 that abuts against the tip of the support member 4 when the jib 12 is raised to a prescribed height. The support member 4 is provided to the revolving superstructure 11, and the abutment member 5 is provided to the jib 12. The abutment member 5 comprises a fitting part to which a part of the tip of the support member 4 can be fitted, and a damper part that absorbs shocks when a part of the tip of the support member 4 comes into contact with the fitting part. When the jib 12 is raised to the prescribed height, the tip of the support member 4 is fitted to the fitting part, thereby supporting the jib 12 by the support member 4.SELECTED DRAWING: Figure 2

Description

The present invention relates to a marine deck crane fall prevention mechanism for preventing a deck crane mounted on a marine deck from toppling over.

Conventionally, a ship deck crane installed on a ship deck has been proposed (for example, Patent Document 1). FIG. 1 of Patent Document 1 shows a ship deck crane (100) installed on a deck (52) of a ship (51). The ship deck crane (100) is provided with a crane device (10), and can perform loading / unloading work of an object (C) on a ship (51).

As shown in FIG. 2 of Patent Document 1, the crane device (10) includes a swivel body (11), a jib (12), a swivel device (13), an elevation device (14), and a hoisting device (15). ) And is configured. The swivel body (11) is arranged on a gantry (16) provided on the ship (51). The swivel body (11) is rotatably provided around the axis of the rotation axis (AX1) orthogonal to the support surface (16a) of the gantry (16). The jib (12) is a rod-shaped member, and a base end portion (12a) is attached to a swivel body (11). The jib (12) can undulate around the axis of the swing axis (AX2) parallel to the horizontal direction at the proximal end portion (12a).

The crane device (10) is configured to be rotatable via a swivel body (10). When the swivel body (10) rotates, the jib (12) attached to the swivel body (10) also rotates. As a result, the tip of the jib (12) can be projected to the side of the deck (52) so that the object can be pulled up from the sea or the object can be lowered into the sea.

Utility Model Registration No. 3210358 Gazette

By the way, a ship at sea may swing greatly under the influence of waves. In Patent Document 1, when the ship rises in a state where the jib (12) faces in the width direction due to the rotation of the swivel body (10) and the ship swings greatly in the width direction, the jib (12) falls and is damaged. There is a risk of

Therefore, an object of the present invention is to provide a fall prevention mechanism for a marine deck crane capable of preventing a jib provided on a swivel body from tipping over due to the influence of a wave.

In order to achieve the above object, the present invention has a swing body provided so as to be swivel around a vertical axis with respect to a deck of a ship, a jib provided on the swing body, and the wire by winding or unwinding the wire. A fall prevention mechanism for a marine deck crane including a winch for undulating the jib connected to the swivel body, wherein the swivel body is provided with a rod-shaped support member extending in a substantially horizontal direction, and the jib is provided with a rod-shaped support member. A contact member is provided that comes into contact with the tip of the support member when the jib rises to a predetermined height, and the contact member includes a fitting portion into which a part of the tip of the support member can be fitted. A damper portion that absorbs an impact when a part of the tip of the support member comes into contact with the fitting portion is provided, and when the jib rises to a predetermined height, the tip of the support member is attached to the fitting portion. Provided is a fall prevention mechanism for a marine deck crane, characterized in that the jib is supported by the support member by fitting.

Here, it is preferable that the support member is configured to be expandable and contractible in the longitudinal direction.

Further, a cylindrical member arranged so that the cylindrical axial direction is orthogonal to the longitudinal direction of the support member is provided on the tip end side of the support member, and the fitting portion has a cross section into which the cylindrical member can be fitted. It preferably has an arc shape.

According to the present invention, when the jib rises to a predetermined height, the tip of the support member fits into the fitting portion, so that the jib is supported by the support member. Therefore, even if the ship swings greatly due to the influence of the wave, the jib does not fall and the damage of the jib can be avoided.

The schematic diagram which shows the ship which has a ship deck crane. The figure which shows the fall prevention device attached to the deck crane for a ship. The figure which shows the support rod which constitutes a part of the transfer prevention apparatus. The figure which shows the contact member which constitutes a part of the transfer prevention apparatus. The V arrow view of FIG. 4. The figure which shows the U-shaped lock for fixing a contact member with respect to a jib. The schematic diagram which shows how the jib is supported by a support member.

<1. Embodiment>
The fall prevention mechanism of the marine deck crane according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7.

In the following, as an example of a marine deck crane, the marine deck crane 1 shown in FIG. 1 will be illustrated. Further, as an example of the fall prevention mechanism of the marine deck crane, the fall prevention device 3 shown in FIG. 2 will be illustrated.

The marine deck crane 1 is a work machine installed on the deck 22 of the ship 2 and used for pulling up and lowering an object (oyster raft or the like) from the sea at sea.

As shown in FIG. 1, the marine deck crane 1 includes a swivel body 11, a jib 12, a winch 13, and the like.

As shown by the broken line arrow in FIG. 1, the swivel body 11 is a swivel device provided so as to be swivelable around a vertical axis with respect to the deck 22. The jib 12 is a rod-shaped member that can be undulated around the axis of the support shaft 11a. The winch 13 is a device that raises and lowers the jib 12 connected to the wire WR by winding and unwinding the wire WR. The winch 13 is provided on the rear end side (the side opposite to the support shaft 11a) of the swivel body 11.

As shown in FIG. 2, the marine deck crane 1 is equipped with a fall prevention device 3 for preventing the jib 12 from falling under the influence of waves at sea.

The fall prevention device 3 includes a support member 4 provided for the swivel body 11 and a contact member 5 provided for the jib 12.

The support member 4 includes a support rod 41 extending in the horizontal direction and a support rod 42 provided below the support rod 41 to support the support rod 41. The support rod 41 is an example of the support member according to the present invention.

As shown in FIG. 3, the support rod 41 includes a body portion 411, a nut 412 provided at the tip portion of the body portion 411, a bolt 413 that meshes with the nut 412, and a cylindrical member fixed to the tip end portion of the bolt 413. It is configured with 414.

The body portion 411 is configured as a hollow cylindrical member, and is configured to be able to accommodate a part of the bolt 413.

The cylindrical member 414 is fixed to the tip of the bolt 413 so that the cylindrical axial direction is orthogonal to the longitudinal direction DR of the support rod 41.

When the cylindrical member 414 is rotated, the bolt 413 connected to the cylindrical member 414 also rotates. When the bolt 413 is rotated in a predetermined direction, the support rod 41 is extended, and when the bolt 413 is rotated in the direction opposite to the predetermined direction, the support rod 41 is contracted. With this configuration, the support rod 41 is configured to be expandable and contractible in the longitudinal direction DR.

As shown in FIG. 2, the support rod 41 is provided on the swivel body 11 so that the longitudinal direction is substantially horizontal. Specifically, the base end portion of the support rod 41 is fixed to the beam 112 among the beams 111 and 112 constituting a part of the housing of the swivel body 11.

Although only the support rod 41 provided on the left side is shown in FIG. 2, the same support rod 41 is actually provided on the beam on the right side. That is, two support rods 41 are provided on the left and right sides.

The support rod 41 is provided with a support rod 42 that supports the support rod 41. The lower end of the support rod 42 is fixed to the beam 112, and the upper end of the support rod 42 is fixed to the body portion 411 of the support rod 41.

Subsequently, the contact member 5 provided with respect to the jib 12 will be described with reference to FIGS. 4 to 6.

As shown in FIG. 4, the contact member 5 includes U-shaped plates 51A and 51B, a pair of fixing rods 52, and a pair of arc plates 53.

The U-shaped plates 51A and 51B are arranged so that their openings face each other. As shown in FIG. 5, the U-shaped plate 51A and the U-shaped plate 51B are fixed with bolts via a damper rubber 54 described later.

A pair of fixing rods 52 are fixed to the U-shaped plate 51A. Further, a pair of arc plates 53 are fixed to the U-shaped plate 51B.

The pair of fixing rods 52 are arranged along the frame of the jib 12 and are fixed to the frame of the jib 12 by a U-shaped lock as shown in FIG. As a result, the contact member 5 is fixed in a state of being attached to the jib 12.

The pair of arc plates 53 is a member obtained by bending an iron plate into an arc shape in which a cylindrical member 414 can be fitted, and is an example of a fitting portion according to the present invention.

As shown in FIG. 5, a damper rubber 54 is provided in the gap between the U-shaped plate 51A and the U-shaped plate 51B. The damper rubber 54 is a member for absorbing an impact when the cylindrical member 414 (that is, the tip of the support rod 41) comes into contact with the arc plate 53, and is an example of the damper portion according to the present invention.

As shown in FIG. 7, the contact member 5 is provided at a position where the jib 12 comes into contact with the tip of the support member 4 when the jib 12 rises to a predetermined height. Specifically, the contact member 5 is provided at a position where the cylindrical member 414 of the support rod 41 is fitted to the pair of arc plates 53.

According to the above-described embodiment, when the jib 12 rises to a predetermined height, the tip of the support member 4 (cylindrical member 414 of the support rod 41) fits into the pair of arc plates 53 to support the jib 12. It is supported by the member 4. Therefore, even if the ship swings greatly due to the influence of the wave, the jib 12 does not fall and the damage of the jib 12 can be avoided.

Further, according to the above-described embodiment, since the support rod 41 is configured to be expandable and contractible in the longitudinal direction DR, the length of the support rod 41 is adjusted according to the marine deck crane on which the fall prevention device 3 is installed. It is possible.

Further, according to the above-described embodiment, the cylindrical member 414 is provided at the tip of the support rod 41 so that the cylindrical member 414 fits into the arc plate 53 having an arcuate cross section when the jib 12 rises to a predetermined height. It is configured in. Therefore, even if some misalignment occurs, the cylindrical member 414 can be reliably fitted to the arc plate 53.

<2. Modification example>
The fall prevention mechanism for a marine deck crane according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims.

For example, in the above-described embodiment, the case where the arc plate 53 is used as an example of the fitting portion is illustrated, but the present invention is not limited to this, and other shapes such as a V-shaped plate may be used.

Further, in the above-described embodiment, the case where the damper rubber 54 is used as an example of the damper portion is exemplified, but the present invention is not limited to this, and another cushioning material such as a shock absorbing gel may be used.

As described above, the fall prevention mechanism of the marine deck crane according to the present invention is suitable for preventing the jib provided on the swivel body from falling.

1 Ship deck crane 2 Ship 3 Fall prevention device 4 Support member 5 Contact member 11 Swing body 12 Jib 13 Winch 22 Deck 41 Support rod 42 Support rod 51A, 51B U-shaped plate 52 Fixed rod 53 Arc plate 54 Damper rubber 111 , 112 Crane 411 Body 412 Nut 413 Bolt 414 Cylindrical member DR Longitudinal WR wire

In order to achieve the above object, the present invention has a swivel body provided so as to be swivel around a vertical axis with respect to a deck of a ship, a jib provided on the swivel body, and the wire by winding or unwinding the wire. A fall prevention mechanism for a marine deck crane including a winch for undulating the jib connected to the swivel body, wherein the swivel body is provided with a rod-shaped support member extending in a substantially horizontal direction, and the jib is provided with a rod-shaped support member. A contact member is provided that comes into contact with the tip of the support member when the jib rises to a predetermined height, and the contact member includes a fitting portion into which a part of the tip of the support member can be fitted. A damper portion that absorbs an impact when a part of the tip of the support member comes into contact with the fitting portion is provided, and when the jib rises to a predetermined height, the tip of the support member is attached to the fitting portion. By fitting, the jib is supported by the support member, and the support member includes a body portion, a nut provided at the tip end portion of the body portion, a bolt that meshes with the nut, and the support member in the cylindrical axial direction. It has a cylindrical member fixed to the tip of the bolt so as to be orthogonal to the longitudinal direction of the member, and the body portion is configured as a hollow cylindrical member so as to be able to accommodate a part of the bolt. Along with the rotation of the cylindrical member, the bolt connected to the cylindrical member also rotates, and when the bolt rotates in a predetermined direction, the support member expands and the bolt rotates in a direction opposite to the predetermined direction. The support member is configured to be expandable and contractible in the longitudinal direction by contracting the support member, and the fitting portion has an arcuate cross section into which the cylindrical member can be fitted . It provides a fall prevention mechanism for deck cranes.

In order to achieve the above object, the present invention has a swivel body provided so as to be swivel around a vertical axis with respect to a deck of a ship, a jib provided on the swivel body, and the wire by winding or unwinding the wire. A fall prevention mechanism for a marine deck crane including a winch for undulating the jib connected to the swivel body, wherein the swivel body is provided with a rod-shaped support member extending in a substantially horizontal direction, and the jib is provided with a rod-shaped support member. A contact member is provided that comes into contact with the tip of the support member when the jib rises to a predetermined height, and the contact member includes a fitting portion into which a part of the tip of the support member can be fitted. A damper portion that absorbs an impact when a part of the tip of the support member comes into contact with the fitting portion is provided, and when the jib rises to a predetermined height, the tip of the support member is attached to the fitting portion. By fitting, the jib is supported by the support member, and the support member includes a body portion, a nut provided at the tip end portion of the body portion, a bolt that meshes with the nut, and the support member in the cylindrical axial direction. It has a cylindrical member fixed to the tip of the bolt so as to be orthogonal to the longitudinal direction of the member, and the body portion is configured as a hollow cylindrical member so as to be able to accommodate a part of the bolt. Along with the rotation of the cylindrical member, the bolt connected to the cylindrical member also rotates, and when the bolt rotates in a predetermined direction, the support member expands and the bolt rotates in a direction opposite to the predetermined direction. The support member is configured to be expandable and contractible in the longitudinal direction by contracting the support member, and the fitting portion has an arcuate cross section into which the cylindrical member can be fitted. It provides a fall prevention mechanism for deck cranes.

Claims (3)

A swivel body that can be swiveled around a vertical axis with respect to the deck of a ship, a jib provided on the swivel body, and a winch that undulates the jib connected to the wire by winding or unwinding the wire. It is a fall prevention mechanism for marine deck cranes.
The swivel body is provided with a rod-shaped support member extending in a substantially horizontal direction.
The jib is provided with a contact member that comes into contact with the tip of the support member when the jib rises to a predetermined height.
The contact member is
A fitting portion into which a part of the tip of the support member can be fitted,
A damper portion that absorbs an impact when a part of the tip of the support member comes into contact with the fitting portion, and a damper portion.
Equipped with
When the jib rises to a predetermined height, the tip of the support member fits into the fitting portion, so that the jib is supported by the support member to prevent the marine deck crane from tipping over. mechanism. The fall prevention mechanism for a marine deck crane according to claim 1, wherein the support member is configured to be expandable and contractible in the longitudinal direction. A cylindrical member is provided on the tip end side of the support member so that the cylindrical axial direction is orthogonal to the longitudinal direction of the support member.
The fall prevention mechanism for a marine deck crane according to claim 1 or 2, wherein the fitting portion has an arc shape in which the cylindrical member can be fitted.

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