JP6571479B2 - Pulley and deck crane equipped with the pulley - Google Patents

Description

  The present invention relates to a pulley and a deck crane provided with the pulley.

  In general, in the case of a deck crane deployed in a cargo ship such as a container ship or a bulk carrier, a suspended load is lifted and lowered by a wire rope that is unwound from a drum and wound around a sheave.

  Since a very large load acts on the sheave, a metal sheave having high strength is widely used.

  On the other hand, the wire rope hung around the sheave is worn by long-term use because friction occurs between the sheave and the rope groove of the sheave. Thus, in order to extend the life of the wire rope, a sheave having a sheave body made of resin has been recently proposed. Such resin sheaves are softer and have greater elasticity than metal sheaves, so that the bending stress of the wire rope is reduced. In addition, the wire rope compresses the resin and bites deeply into the rope groove, and the contact area between the rope groove and the wire rope increases and the contact surface pressure decreases. It is possible to extend the service life.

  Resin sheaves are capable of extending the life of wire ropes compared to metal sheaves, but the production costs are unavoidable. In addition, the resin sheave is easy to give the impression that the sheave has deteriorated because the rope groove is likely to have a line mark due to the wire rope. For this reason, even though the sheave has not reached its useful life, replacement of the sheave is required, and as a result, the service life of the sheave may be shortened.

  If the sheave replacement work is frequently required, a new expensive sheave must be attached to the deck crane, and there has been a concern that the cost will increase. Also, when replacing a sheave, it is necessary to remove the wire rope from the sheave before the replacement and to hang the wire rope around the sheave after the replacement, both of which are very complicated work at high places. As a result, work efficiency was a factor.

  In order to solve the above-mentioned problems, a resin groove protection member is detachably attached to the rope groove of the metal sheave main body, and the life of the wire rope is increased, while the cost is increased and the work efficiency is increased. There has been proposed a sheave that can suppress a decrease in (see, for example, Patent Document 1).

  By the way, when the sheave is used as a pulley such as a hook block, for example, the sheave is attached to a block body constituting the hook block so as to be rotatable around a support shaft. A protective cover is attached to cover the outer peripheral surface of the sheave.

  For example, Patent Document 2 shows a general technical level related to a pulley such as the hook block.

International Publication No. 2014/065183 JP 2014-189402 A

  However, as described above, in the case of a pulley to which a protective cover is attached so as to cover the outer peripheral surface of the sheave, the sheave is disposed in a space closed by the block main body and the protective cover. The sheave had to be disassembled when maintaining the sheave, including the replacement work.

  In general, the block body that covers the sheave needs to maintain strength and protect the sheave. Therefore, the block body is made of steel plate and is very heavy. It is difficult to support. Therefore, in order to disassemble the pulley, facilities such as a crane or a chain block for lifting and supporting the block main body are indispensable, and maintenance work is not easy, and much labor and time are required.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a pulley capable of improving workability during sheave maintenance and a deck crane including the pulley.

The present invention provides a sheave that is rotatably provided around a support shaft;
In a pulley provided with a protective cover provided so as to cover the outer peripheral surface of the sheave,
The protective cover is movably disposed so as to be switchable between a closed position that covers the outer peripheral surface of the sheave and an open position that partially exposes the outer peripheral surface of the sheave .
The sheave is
A sheave body with a rope groove formed on the outer periphery;
A groove protection member detachably attached to the rope groove of the sheave body;
A fastening member for fixing the groove protection member to the sheave body;
With
The protective cover is
It is divided into a fixed cover part and a movable cover part,
One end of the movable cover portion is attached to the fixed cover portion by an opening / closing member so as to be freely opened and closed, and the other end of the movable cover portion is fixed by the lock member at the closed position,
The position where the protective cover is dividedly formed into the fixed cover portion and the movable cover portion is applied to the pulley in which the length of the movable cover portion is set to be longer than at least the groove protection member .

  Moreover, in order to solve the said subject, the deck crane of this invention is equipped with the said pulley.

  According to the pulley of the present invention and the deck crane equipped with the pulley, it is possible to achieve an excellent effect that workability can be improved during the maintenance of the sheave.

It is a front view which shows the state which hold | maintained the protective cover in the Example of the pulley of this invention in the closed position. It is a side view which shows the state which hold | maintained the protective cover in the Example of the pulley of this invention in the closed position. It is a front view which shows the state which expanded the protective cover in the Example of the pulley of this invention to the open position. It is a perspective view which shows the state which expanded the protective cover in the Example of the pulley of this invention to the open position. It is a schematic block diagram which shows the sheave in the Example of the pulley of this invention, Comprising: (a) is sectional drawing, (b) is a side view. It is a whole outline side view showing the example of the deck crane provided with the pulley of the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIGS. 1-6 is an Example of the pulley of this invention and the deck crane provided with this pulley.

  First, the outline | summary of the deck crane 1 is demonstrated using FIG. The deck crane 1 includes a support base 2 installed on a deck D of a cargo ship SP as a ship, a swivel mast 3 that is turnably disposed on the support base 2, and a cab 4 provided in the swivel mast 3. And a jib 6 attached to a lower part of the swivel mast 3 via a fulcrum pin 5 so as to be raised and lowered.

  A hoisting drum 7 is arranged inside the turning mast 3 of the deck crane 1, and a wire rope 8 is fed out from the hoisting drum 7, and the wire rope 8 causes a hook block 9 as a pulley from the tip of the jib 6. The suspended load C is suspended through the. When the wire rope 8 is wound up by the hoisting drum 7, the suspended load C is raised, and when the wire rope 8 is fed out by the hoisting drum 7, the suspended load C is lowered.

  Further, a lifting drum 10 is arranged inside the turning mast 3 of the deck crane 1, and a wire rope 11 fed out from the lifting drum 10 is rooted at the tip of the jib 6 or the top of the turning mast 3. Yes. When the wire rope 11 is wound up by the lifting drum 10, the jib 6 is driven in a standing direction, and when the wire rope 11 is fed out by the lifting drum 10, the jib 6 is driven in a lying down direction. ing.

  The wire rope 8 and the wire rope 11 are hung around a sheave 20 disposed at an upper portion of the swivel mast 3 and a tip portion of the jib 6. Further, the wire rope 8 suspended from the tip of the jib 6 is hung around the sheave 20 of the hook block 9.

  As shown in FIGS. 1 to 4, the hook block 9 as the pulley includes a block body 30, a sheave 20, a protective cover 40, and a hook 50. In the block main body 30, two steel plate block plates 30a are arranged at a required interval so as to sandwich the sheave 20 from both sides, and the two block plates 30a include bolts 31a, nuts 31b and It has a structure that is connected and fixed by a connecting member 31 formed of a tubular spacer 31c. The sheave 20 is attached to the block body 30 so as to be rotatable about a support shaft 32. The protective cover 40 is attached to the block body 30 so as to cover a lower half portion around which the wire rope 8 is wound on the outer peripheral surface of the sheave 20, and prevents the wire rope 8 from falling off the sheave 20 due to slack. In addition, the grease is prevented from dripping from the support shaft 32. The hook 50 is suspended from a support pin 33 attached to the lower portion of the block body 30 via a shackle 51.

  In the case of this embodiment, the protective cover 40 is closed (see FIGS. 1 and 2) covering the outer peripheral surface of the sheave 20, and the open position (FIG. 1) partially exposes the outer peripheral surface of the sheave 20. 3 and FIG. 4) is characterized in that it is movable so that it can be switched between. The protective cover 40 is not limited to a type that is attached to the block main body 30 so as to cover the lower half portion of the outer peripheral surface of the sheave 20, but depending on how the wire rope 8 is wound, Needless to say, the present invention can also be applied to a cover covering a portion other than the lower half of the outer peripheral surface of the sheave 20.

  The protective cover 40 is divided into a fixed cover portion 40A and a movable cover portion 40B, and one end of the movable cover portion 40B is attached to the fixed cover portion 40A by a hinge 41 as an opening / closing member, The other end of the movable cover portion 40B is fixed to the block body 30 by the lock member 42 in the closed position.

  As shown in FIG. 4, a sleeve 43 extending in parallel with the support shaft 32 is integrally fixed to the other end of the movable cover portion 40 </ b> B, and fixed at a corresponding position of the block plate 30 a of the block body 30. As shown in FIG. 2, the movable cover portion 40B is fixed in the closed position by passing the bolt 42a constituting the lock member 42 and tightening the nut 42b with respect to the hole 34 and the sleeve 43. is there.

On the other hand, in the case of this embodiment, the sheave 20 includes a sheave body 21 as shown in FIGS. 5A and 5B, and a rope groove 22 is formed on the outer periphery of the sheave body 21. Yes. A groove protection member 23 is detachably attached to the rope groove 22 of the sheave body 21 by a fastening member 24. The sheave body 21 has a configuration in which a boss portion 21a fitted to the support shaft 32 and a rim portion 21b in which the rope groove 22 is formed are connected by a spoke portion 21c extending in the radial direction. ing.
The position where the protective cover 40 is divided into the fixed cover portion 40A and the movable cover portion 40B may be a position where the length of the movable cover portion 40B is set to be longer than at least the groove protection member 23. .

  Next, the operation of the above embodiment will be described.

  For example, when replacing the groove protection member 23, the nut 42b is loosened and the bolt 42a is removed from the state shown in FIGS.

  Subsequently, the movable cover 40B of the protective cover 40 is rotated from the closed position to the open position as shown in FIGS. 3 and 4 with the hinge 41 as a fulcrum.

  When the movable cover portion 40B of the protective cover 40 is rotated to the open position, the wire rope 8 can be pulled away from the sheave 20 and the outer peripheral surface of the sheave 20 can be partially exposed.

  When the outer peripheral surface of the sheave 20 is partially exposed, the fastening member 24 shown in FIG. 5 can be loosened to remove the groove protection member 23 and be replaced with a new one.

  In the case of the hook block 9 as a pulley to which the protective cover 40 is attached so as to cover the outer peripheral surface of the sheave 20, the sheave 20 is disposed in a space closed by the block main body 30 and the protective cover 40. As described above, by rotating the movable cover portion 40B of the protective cover 40 to the open position, the hook block 9 as a pulley is disassembled even when maintenance of the sheave 20 including replacement work of the groove protective member 23 is performed. You don't have to.

  As a result, when performing maintenance, facilities such as a crane or a chain block for lifting and supporting the block body 30 made of a steel plate and having a very heavy weight in order to maintain strength and protect the sheave 20 are provided. It becomes unnecessary and maintenance work can be easily performed, so that much labor and time are not wasted.

  Further, in the case of the hook block as a pulley disclosed in Patent Document 2, the cover member is for avoiding interference with the base end side leg portion of the extension jib provided at the tip of the boom of the crane, It is completely removed when the wire rope is switched. For this reason, there is a possibility that the cover member may be lost or forgotten to be attached after completion of the wire rope changing operation. On the other hand, as in this embodiment, the protective cover 40 is closed to cover the outer peripheral surface of the sheave 20 (see FIGS. 1 and 2) and opened to partially expose the outer peripheral surface of the sheave 20. If it is movably arranged so as to be switchable between positions (see FIGS. 3 and 4), the protection cover 40 may be lost or the protection cover 40 may be forgotten after the maintenance work of the sheave 20 is completed. Nor.

  In this way, workability at the time of maintenance of the sheave 20 can be improved.

  The sheave 20 includes a sheave body 21 in which a rope groove 22 is formed on the outer periphery, a groove protection member 23 that is detachably attached to the rope groove 22 of the sheave body 21, and the groove protection member 23 that is attached to the sheave. And a fastening member 24 fixed to the main body 21. In the case of such a sheave 20, since the replacement work of the groove protection member 23 is required, it is more effective to improve the working efficiency that the hook block 9 as a pulley need not be disassembled.

  The protective cover 40 is divided into a fixed cover part 40A and a movable cover part 40B, and one end of the movable cover part 40B is attached to the fixed cover part 40A by a hinge 41 as an opening / closing member. The other end of the movable cover portion 40B is fixed by the lock member 42 at the closed position. Thereby, since the movable cover part 40B is not completely separated from the fixed cover part 40A, loss of the movable cover part 40B and forgetting to attach the movable cover part 40B after completion of the maintenance work of the sheave 20 can be prevented. .

  Furthermore, in the deck crane 1 provided with the hook block 9 as the pulley, the maintenance work of the sheave 20 can be efficiently performed under a severe corrosive environment facing the ocean, and the cargo handling work can be smoothly advanced.

  The pulley of the present invention and the deck crane provided with the pulley are not limited to the above-described embodiments, and are not limited to the deck crane and can be widely applied to various crane devices and other mechanical devices. Of course, various modifications can be made without departing from the scope of the present invention.

1 Deck crane 9 Hook block (pulley)
20 Sheave 21 Sheave body 22 Rope groove 23 Groove protection member 24 Fastening member 32 Support shaft 40 Protective cover 40A Fixed cover portion 40B Movable cover portion 41 Hinge (opening / closing member)
42 Locking member

Claims (2)

A sheave provided rotatably around a support shaft;
In a pulley provided with a protective cover provided so as to cover the outer peripheral surface of the sheave,
The protective cover is movably disposed so as to be switchable between a closed position that covers the outer peripheral surface of the sheave and an open position that partially exposes the outer peripheral surface of the sheave .
The sheave is
A sheave body with a rope groove formed on the outer periphery;
A groove protection member detachably attached to the rope groove of the sheave body;
A fastening member for fixing the groove protection member to the sheave body;
With
The protective cover is
It is divided into a fixed cover part and a movable cover part,
One end of the movable cover portion is attached to the fixed cover portion by an opening / closing member so as to be freely opened and closed, and the other end of the movable cover portion is fixed by the lock member at the closed position,
The position where the protective cover is divided into the fixed cover portion and the movable cover portion is a pulley where the length of the movable cover portion is set to be longer than at least the groove protection member . A deck crane provided with the pulley according to claim 1 .

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