JP2004142839A - Messenger wire jumping preventing device for traverse current collector of container crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a messenger wire in a traverse current collector jumps and is hooked to a member at a rail side or a member at a carrier side when a trolley moves close to the tip of a boom in a container crane that moves the trolley speedily. <P>SOLUTION: The traverse current collector of the container crane comprises a cabtyre cable for collecting power in a trolley traversely traveling along the girder and boom; and the messenger wire for traversely moving the cabtyre cable via a plurality of carriers that can travel along the girder and boom. The messenger wire has a plurality of messenger wires between carriers for connecting the adjacent carriers. Between the adjacent carriers, a middle section in the longitudinal direction of the messenger wire between carriers is composed with a flexible tension member for connecting to the middle section in the longitudinal direction of the cabtyre cable with specific distance as a main body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a messenger wire jumping prevention device for a transverse current collector of a container crane.
[0002]
2. Description of the Related Art For example, as described in Patent Document 1, a container crane includes a self-propelled leg structure, a horizontal girder mounted on an upper portion of the leg structure, and a horizontal girder connected to the girder. A boom that can be switched between a use position and a retracted position that is flipped upward, a trolley that runs in the traverse direction on the girder and the boom, and a cabtire cable that supplies power and control signals to the trolley. A current collector.
[0003]
In order to move the trolley between a position retracted to the base end side of the girder and a position advanced to near the tip of the boom, the cabtire cable needs to maintain a constantly connected state to the trolley moving over a wide range. Therefore, a large number of carriers are movably mounted on the rails of the girder and the boom, and these many carriers are connected by a large number of messenger wires that connect adjacent carriers. Is fixed at the position.
[0004]
When the trolley is in the retracted position on the base end side of the girder, a number of carriers are arranged in an approaching state, and the messenger wire and the captire cable hang down in a U-shape between adjacent captire cables. Also, when the trolley moves forward near the tip of the boom, the messenger wire is stretched linearly along the lower surface of the rail, and the cabtire cable has a loosely curved catenary curve between adjacent carriers. It becomes a loose state.
[Patent Document 1] JP-A-2000-53374
In a conventional ordinary container crane, the traveling speed of the trolley is about 180 m / min. However, recent container cranes have been remarkably speeded up. The traveling speed of the trolley has been increased to 240 m / min. In such a high-speed container crane, when the trolley moves at high speed toward the end of the boom and the messenger wires between the carriers are completely extended, the messenger wires jump up due to the movement inertia and wind, and the girder and the boom are moved. In the vicinity of the rail portion or the member near the roller of the carrier.
[0006]
In that case, since the crane maintenance worker must stop the container crane and walk on the girder and the boom to the messenger wire failure point and remove the hooked messenger wire, the crane availability decreases, There is a problem in that work at a high place is required, which leads to wasteful labor and time.
SUMMARY OF THE INVENTION An object of the present invention is to provide a messenger wire jumping prevention device of a traverse current collector of a container crane which can surely prevent the messenger wire jumping.
[0007]
SUMMARY OF THE INVENTION The invention of claim 1 (a messenger wire jump-up preventing device of a traverse current collector of a container crane) is provided for collecting electricity on a trolley traversing along a girder and a boom of a container crane. In a traverse current collector for a container crane comprising a cabtire cable and a messenger wire for moving the cabtire cable in a transverse direction via a plurality of carriers movable along a girder and a boom, the messenger wire is connected to an adjacent carrier. A plurality of inter-carrier messenger wires are connected to each other, and between adjacent carriers, a longitudinal intermediate portion of the inter-carrier messenger wire is connected to a longitudinal intermediate portion of the cap tire cable between the carriers by a predetermined distance. Provided with a flexible tension member The one in which the features.
[0008]
Between adjacent carriers, since a lengthwise intermediate portion of the inter-carrier messenger wire is provided with a flexible tension member that is connected to the lengthwise intermediate portion of the cabtire cable between the carriers at a predetermined distance, Since a part of the weight of the cabtire cable between the carriers acts on the inter-carrier messenger wire via the tension member, a tension having a horizontal component force that draws the adjacent carriers in the phase approaching direction acts on the inter-carrier messenger wire. .
[0009]
Since the tension and the horizontal component force increase as the distance between the carriers increases (as the inclination angle of the wire with respect to the horizontal decreases), when the trolley moves at a high speed toward the tip of the boom, the messenger between the carriers is required. Suppress the upward jump of the wire. As a result, when the trolley moves to the tip side of the boom, the inter-carrier messenger wire jumps up and is not caught by the girder and the boom-side member or the carrier-side member, but also the inter-carrier messenger wire moves to the rail portion. Collision is less likely to occur, and collision noise is reduced even if collision occurs. On the other hand, when the trolley moves toward the base end of the girder, if the distance between the carriers is small, the horizontal component force becomes very small, so that the carriers do not easily collide with each other.
[0010]
When the trolley moves toward the distal end of the boom, the inclination angle of the inter-carrier messenger wire with respect to the horizontal at the distal end side and the proximal end side with respect to the carrier is different, and the inclination angle of the distal end side wire with respect to the carrier is at the proximal end of the carrier. It becomes smaller than the inclination angle of the wire on the side. Therefore, the resultant force of the two opposite horizontal component forces acting on the carrier becomes a force directed toward the boom tip, so that when the trolley moves toward the boom tip, the trolley moves toward the boom tip side of each carrier. Movement will be assisted.
[0011]
Contrary to the above, when the trolley moves toward the base end of the boom, the inclination angle of the wire on the boom base side with respect to the carrier is smaller than the inclination angle of the wire on the boom tip side, so that the horizontal Since the resultant of the component forces is a force directed toward the boom base end, the movement of each carrier to the boom base end side is assisted. Thus, by providing the tension member, the movement of the carrier can be smoothed, and the movement of the trolley can be accelerated.
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, a connecting member is provided at an upper end of the tension member so as to be relatively movable in the wire length direction with respect to the inter-carrier messenger wire. Therefore, since the connecting member at the upper end of the tension member is relatively movable with respect to the inter-carrier messenger wire, it is possible to prevent the durability of the connecting portion between the tension member and the inter-carrier messenger wire from decreasing.
[0013]
According to a third aspect of the present invention, in the first or second aspect of the present invention, a connecting member for connecting to a cable holder fixed to a cabtire cable is provided at a lower end portion of the tension member. The cable holder is a bundle of a plurality of cabtyre cables and fixed integrally. However, since the lower end of the tension member is connected to the cable holder via a connecting member, the lower end of the tension member is connected to the cable holder via the cable holder. Can be connected to a plurality of cabtire cables.
According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the tension member comprises a rope member made of synthetic resin. Since the rope member made of synthetic resin has elasticity in the length direction, the tension member is less likely to break and has excellent durability.
[0015]
Embodiments of the present invention will be described below with reference to the drawings. Note that the front, rear, left and right as viewed from the driver in the cab 21 will be described as front, rear, left and right. As shown in FIG. 1, the container crane 2 includes a horizontal girder 3 and an up-and-down boom 4 extending in the front-rear direction, a leg structure 5 supporting the girder 3 and the boom 4, and four sets of traveling devices 6. The container 7 is loaded and unloaded between the container yard 1 on land and a container ship (not shown) on the sea. The container crane 2 can travel on a rail laid in the container yard 1 from four sets of traveling devices 6 in a direction perpendicular to the paper surface of FIG. 1 (lateral direction).
[0016]
First, the girder 3 and the boom 4 will be briefly described.
In the vicinity of the upper end of the front column member 9 of the leg structure 5, the rear end of the boom 4 is rotatably connected to the front end of the girder 3, and the boom 4 extends over a horizontal position indicated by a solid line and an undulating position indicated by a chain line. , Can be switched by an up-and-down drum (not shown).
A front upper structure 11 is erected at the connection between the girder 3 and the boom 4, and a rear upper structure 12 is also erected at the upper end of the rear column member 10 of the leg structure 5. The girder 3 and the boom 4 are held in a horizontal position by a plurality of diagonal members 13 to 17 extending from the front upper structure 11 and the rear upper structure 12.
[0017]
The girder 3 and the boom 4 are provided with a rail 19 on which the trolley 18 travels. The trolley 18 can move back and forth along the rail 19 while the container 7 is suspended by the spreader 20. A cab 21 is provided behind the trolley 18 so as to be movable back and forth along the rails 19 together with the trolley 18. The driver can operate the container crane 2 for running and stopping, and handle the container 7 (lifting and hanging down). , Positioning, etc.) are performed in the cab 21.
[0018]
Next, the leg structure 5 will be described.
As shown in FIG. 1, the leg structure 5 includes a left side construction surface 22 and a right side construction surface 23 that are interconnected. The upper ends of the left and right construction surfaces 22 and 23 are connected by a pair of front and rear upper connection members, and the lower ends of the left and right construction surfaces 22 and 23 are also connected by a pair of front and rear stock connection members. Two sets of traveling devices 6 are connected to the members, respectively.
[0019]
Since the left construction surface 22 and the right construction surface 23 are bilaterally symmetric and configured similarly, the right construction surface 23 will be described. As shown in FIG. 1, the right construction surface 23 includes a pair of front and rear column members 9 and 10, a horizontal connection member 24 that connects lower portions of the column members 9 and 10, and a length of the horizontal connection member 24. A pair of diagonal members 25 and 26 are provided to connect the middle part in the direction to the upper ends of the front and rear pillar members 9 and 10. The upper end of the front column member 9 of the right construction surface 23 is connected to the front upper connection member, and the upper end of the rear column member 10 of the right construction surface 23 is similarly connected to the rear upper connection member. The upper connecting members of the pair are connected to each other by girder 3. Therefore, the front and rear pillar members 9 and 10 are mutually connected via the girder 3 and the upper connecting member.
[0020]
Next, the messenger wire jump-up prevention device 30 of the traverse current collector of the container crane will be described. As shown in FIGS. 1 to 3, the traverse current collector 31 of the container crane 2 includes a captire cable 32 for collecting power to the trolley 18 traversing along the girder 3 and the boom 4, a girder 3 and a boom And a messenger wire 35A for moving the cabtire cable 32 in the transverse direction via a plurality of carriers 34 movable along a rail member 33 provided at the lower end of the fourth member 4.
[0021]
The messenger wire 35A includes a large number of inter-carrier messenger wires 35 connecting adjacent carriers 34, and the messenger wire 35A is a generic name of a large number of inter-carrier messenger wires 35. The messenger wire jump-up preventing device 30 is mainly composed of a plurality of flexible tension members 36, and each tension member 36 is disposed between adjacent carriers 34 in the longitudinal direction of the messenger wire 35 between carriers. The part is connected to the middle part in the length direction of the cabtire cable 32 between the adjacent carriers 34 at a predetermined distance.
[0022]
As shown in FIGS. 2 and 3, the rail member 33 at the lower end of the girder 3 and the boom 4 is a member having an inverted T-shaped cross section, and is disposed along the girder 3 and the boom 4. The carrier 34 includes a carrier body 40, four sets of horizontal rollers 41 that idle on the flange 33 a of the rail member 33, and four sets of vertical rollers that idle while contacting the left and right surfaces of the web member 33 b of the rail member 33. 42, a cable guide 43, and a pair of wire connectors 44. A ring-shaped thimble 45 is connected to both ends of the inter-carrier messenger wire 35, and the inter-carrier messenger wire 35 is disposed between the adjacent carriers 34. The other end of the thimble 45 is connected to the connecting portion 44 by a shackle and connected to the wire connecting portion 44 of the rear carrier 34.
[0023]
As the cabtire cable 32, 4 to 6 cabtire cables such as a power supply cable and a signal line cable are provided, and the portions of the cabtire cables 32 at predetermined intervals are provided to the cable guide portions 43 of the respective carriers 34. It is guided and supported by being straddled and fixed by a cable clamp (not shown), and hangs down from below the carrier 34 from both front and rear sides of the cable guide portion 43.
Between the respective carriers 34, aluminum cable holders 46 and 47 (see FIG. 4) are provided in the middle part in the length direction of the cabtire cable 32 and at positions separated by a predetermined distance on both sides thereof. 47 causes 4 to 6 cabtire cables 32 to be neatly bundled.
[0024]
Next, the tension member 36 of the messenger wire jump preventing device 30 will be described. As shown in FIGS. 2 and 3, the tension member 36 is made of synthetic resin (nylon or the like) and has a predetermined flexible length. Between the adjacent carriers 34, the upper end of the tension member 36 is connected to the intermediate portion in the longitudinal direction of the inter-carrier messenger wire 35, and the lower end of the tension member 36 is connected to the intermediate portion in the longitudinal direction of the cabtire cable 32 (span intermediate portion). ) Is connected to the cable holder 46. The tension member 36 is for applying a part of the weight of the captire cable 32 to the inter-carrier messenger wire 35 to prevent the inter-carrier messenger wire 35 from jumping up.
[0025]
As shown in FIG. 4, the tension member 36 is mainly composed of a flexible rope member 36 a made of synthetic resin, and the upper end of the tension member 36 has a wire length with respect to the inter-carrier messenger wire 35. A connecting member 36 b made of a shackle that is relatively movable in the vertical direction is provided. A connecting member 36 c that is connected to a cable holder 46 fixed to the cabtire cable 32 is provided at a lower end of the tension member 36. The rope member 36a is also provided with a crimped T-shaped connector 36d. However, the structure of the tension member 36 is not limited to the one shown in FIG. 4, and the intermediate portion of the inter-carrier messenger wire 35 and the intermediate portion in the length direction of the inter-carrier portion of the cabtire cable 32 are separated by a predetermined distance. Any flexible member to be connected may be used.
[0026]
Next, the operation and effect of the messenger wire jump-up preventing device 30 will be described. FIG. 2 shows a state in which the trolley 18 is located midway in the front-rear direction between the girder 3 and the boom 4 and the inter-carrier messenger wire 35 is loosened. In this state, the intermediate portion and the lowermost cable holder of the inter-carrier messenger wire 35 are shown. 46 are connected with a tension member 36 at a predetermined distance, and the tension member 36 is substantially in a straight state. In this state, a part of the weight of the cabtire cable 32 between the adjacent carriers 34 acts on the inter-carrier messenger wire 35 via the tension member 36, so that the inter-carrier messenger wire 35 has its own weight and the cabtire cable 32. Acts on a tension Ta caused by a part of the weight.
[0027]
The tension Ta has a horizontal component Tah that draws the adjacent carriers 34 toward the phase approach side. Then, when the trolley 18 moves further back on the girder 3 and the interval between the carriers 18 is further reduced, the lower end side portion of the tension member 36 is partially loosened locally.
[0028]
FIG. 3 shows a state in which the trolley 18 has moved to the vicinity of the tip of the boom 4 and the messenger wire 35A has almost completely extended. In this state, the inter-carrier messenger wire 35 extends substantially linearly and horizontally, and the adjacent carrier 34 Since the middle portion of the cabtire cable 32 in the length direction and the middle portion of the messenger wire 35 between the carriers in the length direction are connected to each other with a predetermined distance therebetween by the tension member 36, the captire cable 32 has a wide width W. It takes shape.
[0029]
In this state, since the inclination angle of the inter-carrier messenger wire 35 near the carrier 34 becomes smaller, the tension Tb acting on the inter-carrier messenger wire 35 becomes larger than the tension Ta in the case of FIG. The component force Tbh is larger than the horizontal component force Tah in the case of FIG.
When the trolley 18 moves to the distal end side of the boom 4, the inclination angle of the inter-carrier messenger wire 35 with respect to the horizontal at the distal end side and the proximal end side with respect to the carrier 34 differs, and the inclination of the wire 35 at the distal end side with respect to the carrier 34. The angle is smaller than the inclination angle of the wire 35 on the base end side of the carrier 34. Therefore, the resultant force of the two opposite horizontal component forces acting on the carrier 34 becomes a force directed toward the boom tip, and when the trolley 18 moves toward the boom tip, the boom tip of each carrier 34 is moved. Movement to the side will be assisted.
[0030]
Contrary to the above, when the trolley 18 moves toward the boom base, the inclination angle of the wire 35 on the boom base side with respect to the carrier 34 becomes smaller than the inclination angle of the wire 35 on the boom tip side. Since the resultant of the horizontal component force is a force directed toward the boom base end, the movement of each carrier 34 toward the boom base end is assisted. By providing the tension member 36 in this manner, an effect of smoothing the movement of the carrier 34 can be obtained, and the movement of the trolley 18 can be accelerated.
[0031]
The trolley 18 handles the container 7 while moving along the girder 3 and the boom 4 at a high speed of, for example, about 240 m / min. When the trolley 18 moves to the tip end side of the boom 4, as shown in FIG. 3, each inter-carrier messenger wire 35 is almost fully extended, but the intermediate portion of the inter-carrier messenger wire 35 is Since the messenger wire 35 between the carriers is connected to the intermediate portion of the captire cable 32 by the 36, the three-dimensional movement of the messenger wire 35 between the carriers is suppressed by the tension member 36 so as not to move freely. Even if it is attempted to jump upward, for example, it is effectively suppressed by the tension member 36 and does not jump, and does not catch on the member on the rail member 33 side or the member on the carrier 34 side. At the same time, the inter-carrier messenger wire 35 is less likely to collide with the rail member 33, and the collision noise is reduced even if it does.
[0032]
Moreover, since the connecting member 36b at the upper end of the tension member 36 is connected to the inter-carrier messenger wire 35 so as to be relatively movable in its length direction, the durability of the connecting portion between the inter-carrier messenger wire 35 and the tension member 36 is reduced. Nothing to do. Further, since the connection member 36c at the lower end of the tension member 36 is connected to the cable holder 46 fixed to the cabtire cable 32, the lower end of the tension member 36 can be easily connected to the plurality of cabtire cables 32.
[0033]
The tension member 36 is not limited to a synthetic resin member, but may be a flexible member made of a steel wire. The tension member 36 may be formed of a thin metal wire and a thin synthetic resin wire. The formed flexible thing may be used.
The present invention is not limited to the embodiments described above, and those skilled in the art can implement various modifications without departing from the spirit of the present invention, and the present invention is not limited thereto. Modifications are also included.
[0034]
According to the first aspect of the present invention, the lengthwise intermediate portion of the inter-carrier messenger wire is spaced from the adjacent carriers by a predetermined distance to the lengthwise intermediate portion of the captire cable between the carriers. A flexible tensioning member is provided to prevent the messenger wire between carriers from jumping upward when the trolley moves to the front end side of the boom at high speed. The boom-side member and the carrier-side member can be reliably prevented from being caught, and the collision between the inter-carrier messenger wire, the girder, and the boom-side rail can be prevented, and the collision noise can be reduced. On the other hand, when the trolley moves to the base end side of the girder at a high speed, the horizontal component force decreases when the spacing between the carriers decreases, so that the carriers do not easily collide with each other.
[0035]
According to the second aspect of the present invention, since the connecting member that is relatively movable in the wire length direction with respect to the inter-carrier messenger wire is provided at the upper end of the tension member, the connecting member at the upper end of the tension member is connected to the carrier. The messenger wire is relatively movable with respect to the messenger wire, so that the durability of the connecting portion between the tension member and the carrier messenger wire can be prevented from being reduced.
[0036]
According to the invention of claim 3, since the connecting member for connecting to the cable holder fixed to the cap tire cable is provided at the lower end of the tension member, the lower end of the tension member is connected to the plurality of cap tire cables via the cable holder. Can be linked.
According to the fourth aspect of the present invention, since the tension member is made of a synthetic resin rope member, the synthetic resin rope member has elasticity in the length direction, so that the tension member is hardly broken and has a long life. Excellent in nature.
[Brief description of the drawings]
FIG. 1 is a side view of a container crane according to an embodiment of the present invention.
FIG. 2 is a side view of a main part of a messenger wire between carriers, a cabtire cable, and a tension member of the container crane.
FIG. 3 is a side view showing a main part of a messenger wire between carriers, a cabtire cable, and a tension member of the container crane.
FIG. 4 is an enlarged view of a main part of a tension member, a cable holder, and the like.
[Explanation of symbols]
2 container crane 3 girder 4 boom 18 trolley 31 traverse current collector 32 cabtire cable 34 carrier 35 messenger wire 35A between carriers messenger wire 36 tension member 36b connecting member 36c connecting member 46 cable holder

Claims (4)

A captyre cable for collecting electricity on a trolley that traverses along the girder and boom of the container crane, and a messenger wire that moves the cabtire cable in a traverse direction through a plurality of carriers that can move along the girder and the boom. In the current collector of a container crane equipped with
The messenger wire includes a plurality of inter-carrier messenger wires connecting adjacent carriers,
A flexible tension member is provided between adjacent carriers for connecting the intermediate portion of the inter-carrier messenger wire in the longitudinal direction at a predetermined distance to the intermediate portion in the length direction of the cabtire cable between the carriers. Characteristic Messenger wire jump-up prevention device for traverse current collectors of container cranes. The messenger wire according to claim 1, wherein a connecting member is provided at an upper end of the tension member so as to be relatively movable in a wire length direction with respect to the inter-carrier messenger wire. Anti-bounce device. The messenger wire jumping-up prevention device for a traverse current collector of a container crane according to claim 1 or 2, wherein a connecting member that connects to a cable holder fixed to a captire cable is provided at a lower end portion of the tension member. . The messenger wire jump-up prevention device for a traverse current collector of a container crane according to any one of claims 1 to 3, wherein the tension member is formed of a rope member made of a synthetic resin.

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