JPH0543023Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wire rope slack prevention device for a rope trolley type bridge crane used for loading and unloading containers in container yards.

[Conventional technology]

2. Description of the Related Art Conventionally, rope trolley type bridge cranes have been used to load and unload containers between ships and container yards at container wharves in ports.

The above-mentioned rope trolley type bridge crane moves the main trolley along a horizontally extending girder with a length of approximately 100 m, and connects one end of the hoisting wire rope that lifts and lowers the lifting equipment suspended from the main trolley to one end of the girder. The hoisting wire rope is driven by a hoisting drum.

The hoisting wire rope reaches the other end of the girder from one end of the girder via the main trolley's pulley unit and the hoisting pulley unit, is turned by the pulley at the other end, and is stretched onto the hoisting drum. Therefore, when there is no tension and no load is suspended, the hoisting wire rope will loosen significantly due to its own weight between one end of the girder and the main trolley, and between the main trolley and the other end of the girder. If a load is lifted in a slack state, the hoisting wire rope vibrates up and down and comes off the pulley of the main trolley, which is a problem.

Therefore, various wire rope slack prevention devices for preventing the hoisting wire rope from loosening have been proposed and put into practical use.

For example, Japanese Patent Application Laid-Open No. 61-1998, which is filed by the applicant,
Publication No. 226491 describes a wire rope slack prevention device corresponding to, for example, those shown in FIGS. 4a to 4d.

In this wire rope slack prevention device, a first wire 52 connected to the main trolley 50 and passing through a pair of pulleys 51A, 51B is driven by a first drum 53 equipped with a brake, and
A second wire 55 connected at both ends to the pair of auxiliary trolleys 54A, 54B is connected to pulleys 56 at both ends of the girder (not shown). ,5
7 and the brake device 58, the second wire 55 is made driveable by the second drum 59, and the first drum 53 is driven while the second wire 55 is restrained by the brake device 58. The main trolley 50 is moved along the girder, and the pair of auxiliary trolleys 54A, 54B are moved in the same direction as the main trolley 50 at about half the moving speed, so that the auxiliary trolleys 54A, 54B are always aligned with the main trolley 50. It is adapted to be located at an intermediate position between the girder ends.

When moving the main trolley 50 largely in the front and back direction, the brake device 58 is released and the second drum 59 is driven, while when the brake of the first drum 53 is activated, the auxiliary trolleys 54A and 54B are moved by the second wire 55. However, the main trolley 50 moves in the same direction at about twice the speed of the auxiliary trolleys 54A and 54B.

In this way, a pair of auxiliary trolleys 54A, 54
B are located between the main trolley 50 and the girder end, and these auxiliary trolleys 54A and 54B support the intermediate part of the hoisting wire between the main trolley 50 and the girder end to prevent it from loosening. There is.

Figures 4c and 4d show the state in which the front half of the girder is raised upward to avoid interference with ships entering and leaving the port, and in this case, a pair of auxiliary trolleys 5
4A and 54B are moved as far as possible to the land side, and the main trolley 50 is movable within the range of sign L.

[The problem that the idea aims to solve]

In the wire rope slack prevention device disclosed in the above publication, since the first wire that drives the main trolley is connected to the second wire via the auxiliary trolley, the main trolley cannot be moved independently of the pair of auxiliary trolleys. Therefore, when the front half of the girder is erected, the position when the auxiliary trolley on the sea side is moved as far as possible to the land side is limited by the length of the first wire.

If you try to set the movable range of the main trolley as wide as possible when the front half of the girder is erected, the length of the first wire will become longer, and the auxiliary trolley on the sea side will be positioned farther to the sea than the bending point of the girder. I will do it. Furthermore, the same applies when the latter half of the girder is shorter than the first half. In this way, if the auxiliary trolley on the sea side is located seaward from the girder bending point when the first half of the girder is erected, the auxiliary trolley is fixed to the girder before the first half of the girder is erected. The problem is that it has to be done. In this way, there are more constraints when setting the main specifications of the crane, such as the position of the bending point of the girder, the length of the front half of the girder, and the length of the rear half of the girder, and the degree of freedom in setting is restricted. There's a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire rope slack prevention device that allows an auxiliary trolley to follow the main trolley or to move independently of the main trolley if necessary.

[Means to solve the problem]

The wire rope slack prevention device for a rope trolley type bridge crane according to the present invention includes a girder supported horizontally by a leg structure, a main trolley movable along the girder, and a wire connected to the main trolley. A main trolley moving drive means for moving the main trolley along the girder, including a rope, a drum for driving the wire rope, and a rotational drive device for rotationally driving the drum; A rope trolley type bridge crane of the type fixed to the main trolley and the girder, a pair of auxiliary trolleys movably disposed along the girder between the main trolley and each end of the girder and supporting the hoisting wire rope; It includes a wire rope connected to each auxiliary trolley, an auxiliary drum that drives the wire rope, and a driving force transmission mechanism that transmits rotational driving force from the rotational drive device to the auxiliary drum, and the auxiliary trolley is moved in the same direction as the main trolley. an auxiliary trolley moving drive means for moving the trolley at approximately 1/2 the moving speed of the navel; a first clutch interposed in each of the driving force transmission mechanisms; and an auxiliary trolley for rotationally driving each of the auxiliary drums via a second clutch. It is equipped with a rotation drive device.

[Effect]

In the wire rope slack prevention device for a rope trolley type bridge crane according to the present invention, each auxiliary trolley is located intermediate between the main trolley and the girder end, and the first clutch is connected and the second clutch is disconnected. In this state, when the rotary drive device is driven, the main trolley by the main trolley moving drive means moves along the girder. At this time, the rotational driving force from the rotational drive device is transmitted to the auxiliary drum via the drive transmission mechanism, and the auxiliary drum is driven, so the auxiliary trolley moves in the same direction as the main trolley at approximately 1/2 the moving speed. However, each auxiliary trolley is always located at an intermediate position between the main trolley and the girder end, where it supports the hoisting wire rope so that it does not slacken.

If necessary, such as when raising the front half of the girder, separate the first clutch and separate each second clutch.
When the clutch is connected and the auxiliary rotary drive is driven, each auxiliary drum is driven by the rotational driving force from the auxiliary rotary drive, so each auxiliary trolley is moved between the main trolley and the girder end. Can be moved independently.

[Effect of idea]

According to the wire rope slack prevention device for a rope trolley type bridge crane according to the present invention, as explained above, when the first clutch is connected and the second clutch is disconnected, the auxiliary trolley is operated as in the conventional device. In addition to preventing slack in the hoisting wire rope, each auxiliary trolley can be moved independently from the main trolley between the main trolley and the girder end when necessary, such as when raising the front half of the girder. This eliminates the need to fix one of the auxiliary trolleys to the girder when the front half of the girder is erected, and the constraints on crane design are relaxed, making it easy to adjust the position of the girder bending point, the length of the girder front half, etc. Effects such as being able to freely set the length of the rear half of the girder can be obtained.

〔Example〕

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

The rope trolley type bridge crane C according to this embodiment is installed at a container wharf in a port as shown in FIG. 1, and is used to load and unload containers B between the container wharf L and a berthed ship S This crane C is equipped with a four-column leg structure 1 and a pair of left and right interconnected girders 2 disposed above the leg structure so as to extend horizontally in the front-rear direction. The cantilevered front half 2F of the girder 2 is hinged at the bending part 3 so that it can stand upward as shown by the chain line, and the entire crane C moves left and right along the rail R. It is becoming possible to run on its own.

A main trolley 5 that suspends a hanging tool 4 is suspended from the girder 2 so as to be movable along the girder 2 via a guide ring, and a frame-shaped hanging tool 4 for hanging the container B is attached to the main trolley 5. pulley unit 6 and hanging tool 4
It is driven up and down by a hoisting wire rope 8 hung over a pulley unit 7, and one end of the hoisting wire rope 8 is fixed to the front end 2f of the girder 2 and is moved via the pulley units 6 and 7. The hoisting wire rope 8 extending rearward passes through a pulley 9 at the rear end 2r of the girder 2 and connects to a hoisting drum (not shown) disposed on the center of the girder 2 above the leg structure 1. ), and is driven by a winding drum for feeding and winding.

The main transverse rope 11 for moving the main trolley 5 back and forth is driven by a main drum 12 disposed on the center of the girder 2, and one end of the main transverse rope 11 extending from the main drum 12 is connected to the girder. The other end of the main transverse rope 11 extending from the main drum 12 is fixed to the front end of the main trolley 5 via a pulley 13 at the front end of the girder 2. It is fixed to the rear end of the main trolley 5.

The auxiliary trolley 10A is used to support the central part of the span of the hoisting wire rope 8 extending between the main trolley 5 and the girder front end 2f so as not to loosen. An auxiliary trolley 10 is movably suspended along the girder 2 and is used to support the central part of the span of the hoisting wire rope 8 between the main trolley 5 and the pulley 9 at the rear end portion 2r of the girder so as not to loosen.
B is suspended so as to be movable along the girder 2 via a guide ring between the main trolley 5 and the girder rear end 2r.

The auxiliary transverse rope 15A for moving the auxiliary trolley 10A back and forth is driven by an auxiliary drum 16A disposed near the main drum 12, and one end of the auxiliary transverse rope 15A extending from the auxiliary drum 16A is at the front end of the girder. The other end of the auxiliary transverse rope 15A extending from the auxiliary drum 16A is fixed to the auxiliary trolley 10A via the pulley 15 of the girder rear end 2r. ing.

The auxiliary transverse rope 15B for moving the auxiliary trolley 10B back and forth is driven by an auxiliary drum 16B disposed near the main drum 12, and one end of the auxiliary transverse rope 15B extending from the auxiliary drum 16B is at the front end of the girder. It is fixed to the auxiliary trolley 10B via the pulley 17 of the section 2f, and the other end side of the auxiliary transverse rope 15B extending from the auxiliary drum 16B is fixed to the auxiliary trolley 10B via the pulley 18 of the girder rear end section 2r. ing.

In FIG. 1, the positions of the main trolley 5 and the auxiliary trolleys 10A and 10B indicated by solid lines represent the positional relationship during normal cargo handling, and the auxiliary trolley 10A is the main trolley 5 and the girder front end
It moves in the same direction as the main trolley 5 at 1/2 the moving speed of the main trolley 5 while maintaining the intermediate position f. Similarly, the auxiliary trolley 10B moves in the same direction as the main trolley 5 at half the moving speed of the main trolley 5 while maintaining the intermediate position between the main trolley 5 and the girder rear end 2r. Therefore, during normal cargo handling, the hoisting wire rope 8 is supported and stretched by the auxiliary trolleys 10A, 10B in the above-mentioned positional relationship, so that slack can be minimized. The main trolley 5 and auxiliary trolleys 10A and 10B indicated by chain lines in FIG. 1 show the positional relationship when the front half 2F of the girder 2 is erected. Move it to near the end 2r, and then move the auxiliary trolley 10
This figure shows a state where A is stored in a position behind the bending part 3 of the girder 2 by single operation.
As will be described later, by making it possible to operate the auxiliary trolleys 10A and 10B independently, the auxiliary trolley 1 can be placed in a position where there is no problem when the front half 2F of the girder 2 is raised.
0A and 10B can be stored freely.

Next, the main trolley 5 and the auxiliary trolley 10
A drive system for moving A and 10B in the front-back direction along the girder 2 will be explained based on FIGS. 2 and 3.

One end of the main transverse rope 11, which is wound around the main drum 12 a plurality of times and extended, is connected to pulleys 13a and 13b at the front end of the girder (however, in reality, one pulley 1
3) to the front end of the main trolley 5, and the other end of the main transverse rope 11 is attached to pulleys 14a and 14b (however, in reality, it is one pulley 14) at the rear end portion 2r of the girder. ) to the rear end of the main trolley 5.

One end side of the auxiliary transverse rope 15A, which is wound around the auxiliary drum 10A multiple times and extended, is auxiliary via pulleys 15a and 15b (however, it is actually one pulley 15) at the front end portion 2f of the girder. It is fixed to the trolley 10A, and the other end of the auxiliary transverse rope 15A is connected to pulleys 16a, 16 at the rear end portion 2r of the girder.
b (However, it is actually one pulley 16) and is fixed to the auxiliary trolley 10A. Similarly, one end of the auxiliary transverse rope 15B, which is wound around the auxiliary drum 16B a plurality of times and extended, is attached to pulleys 17a and 17b (however,
It is fixed to the auxiliary trolley 10B via a pulley 17 (actually one pulley 17), and the other end of the auxiliary transverse rope 15B is attached to a pulley 18 at the rear end portion 2r of the girder.
a, 18b (However, it is actually one pulley 18)
It is fixed to the auxiliary trolley 10B via.

As shown in FIG. 3, the sprocket 19A at the shaft end of the drum shaft 12a of the main drum 12 and the sprocket 2 at the shaft end of the drum shaft 24A of the auxiliary drum 16A.
A chain 21A is attached to the sprocket 0A, and a chain 21B is similarly attached to the sprocket 19B at the end of the drum shaft 12a of the main drum 12 and the sprocket 20B at the end of the drum shaft 24B of the auxiliary drum 16B. The shaft end of the drum shaft 12a of the main drum 12 on the side opposite to 19A, 19B is connected to the main drive motor 23 via the reducer 22, and the main drum 12 and the auxiliary drums 16A, 16B are driven by the main drive motor 23. It is designed to be rotationally driven. However, here the auxiliary trolley 10A,
10B moves in the same direction as the main trolley 5 and at a movement speed that is 1/2 of the movement speed of the main trolley 5.
Ropes are hung on the main drum 12 and auxiliary drums 16A, 16B using the same hanging method, and chains 21A, 21B are hung on the main drum 12 and auxiliary drums 16A, 16B so that they rotate in the same direction. , and the number of teeth of sprockets 19A, 19B and 20A, 20B and the diameters of main drum 12 and auxiliary drums 16A, 16B so that the peripheral speed of auxiliary drums 16A, 16B is 1/2 of the peripheral speed of main drum 12. is set.

Furthermore, the auxiliary drum 1 is connected to the main drum 12.
The drum shafts 24A, 2 of each auxiliary drum 16A, 16B are connected so that the drum shafts 24A, 2 of each auxiliary drum 16A, 16B can be rotated independently.
4B has electromagnetic clutches 25A, 2 between the sprockets 20A, 20B and the auxiliary drums 16A, 16B.
5B is interposed, and the sprocket 20
A, 20B and each auxiliary drum 16A, 16 on the opposite side
The shaft ends of drum shafts 24A and 24B of B are reducers 26
Auxiliary drive motors 27A, 27 via A, 26B
drum shafts 24A, 24 between the auxiliary drums 16A, 16B and the reducers 26A, 26B.
Electromagnetic clutches 28A and 28B are interposed in B.

Next, the operation of the wire rope slack prevention device of the rope trolley type bridge crane described above will be explained.

During normal cargo handling, the front half 2F of the girder 2 is laid down horizontally as shown by the solid line in Figure 1, and the main trolley 5 is
Cargo handling is carried out with the auxiliary trolley 10A positioned intermediate between the main trolley 5 and the girder rear end 2f, and the auxiliary trolley 10B positioned intermediate between the main trolley 5 and the girder rear end 2r.

In this state, electromagnetic clutches 25A, 25B are connected, electromagnetic clutches 28A, 28B are disconnected, and only main drive motor 23 is used without using auxiliary drive motors 27A, 27B. When the main drive motor 23 is driven to rotate the main drum 12 clockwise in FIG. 2, the main traversing rope 11 is driven clockwise by the main drum 12, so the main trolley 5 moves forward. At this time, auxiliary drum 1
The auxiliary trolleys 10A, 10B are also rotated clockwise and their circumferential speed is 1/2 of the main drum 12 circumferential speed, so the auxiliary trolleys 10A, 10B are rotated clockwise.
Driven by 5B, 1/2 of the moving speed of main trolley 5
Move forward at a speed of .

When the main drum 12 is rotated in the opposite direction to the above, the main trolley 5 moves backward,
Auxiliary trolleys 10A and 10B are 1/1 of main trolley 5.
Move backwards at a speed of 2.

Therefore, the auxiliary trolley 10A is always located between the main trolley 5 and the girder front end 2f to prevent the hoisting wire rope 8 from loosening, and the auxiliary trolley 10B is always located between the main trolley 5 and the girder rear end 2f.
The wire rope 8 is located midway between the wire rope 8 and r to prevent the hoisting wire rope 8 from loosening.

On the other hand, when the front half 2F of the girder 2 is raised upward as shown by the chain line in Figure 1 to avoid interference with the ship S when the ship S enters or leaves the port, the main While moving the trolley 5 to the rear of the bending part 3, the electromagnetic clutch 2
5A, 25B and electromagnetic clutch 28A,
Connect 28B to auxiliary drive motors 27A and 27B.
, the auxiliary trolley 10A and the auxiliary trolley 10B are moved independently of the main trolley 5, respectively, to desired positions (for example, the auxiliary trolley 10B is moved to the girder rear end 2r, and the auxiliary trolley 10A is moved to the bending portion 3). (rear storage position).

However, even after erecting the first half 2F of girder 2,
Since the drive system for the main trolley 5 and the auxiliary trolleys 10A and 10B is functional, the main trolley 5 is movable along the rear half 2R of the girder 2 behind the bending part 3, and the container It is used for cargo handling on the L side (land side) of the wharf. At this time,
Connect electromagnetic clutch 25B and connect electromagnetic clutch 2.
5A, the auxiliary trolley 10B moves in synchronization with the main trolley 5, maintaining the wire rope slack prevention function. In addition, the above electromagnetic 25A, 25
Instead of B, one electromagnetic clutch may be interposed on the drum shaft 12a between the sprockets 19A, 19B and the drum 12. In addition, the main drum 12 and the auxiliary drums 16A, 16B are connected to a chain 21.
A and 21B may be replaced with a gear mechanism for interlocking connection.

[Brief explanation of the drawing]

Among the drawings, Figures 1 to 3 show examples of the present invention, with Figure 1 being a side view of a rope trolley type bridge crane, and Figure 2 being a configuration diagram of the drive system of the main trolley and auxiliary trolley. , Fig. 3 is a block diagram of the drive device that drives the main drum and the auxiliary drum, and Fig. 4 a -
d is an explanatory diagram illustrating each state of the drive system of the main trolley and the auxiliary trolley according to the prior art. C...Rope trolley type bridge crane, 2...
Girder, 5...Main trolley, 8...Hoisting wire rope, 10A, 10B...Auxiliary trolley, 11
...Main transverse rope, 12...Main drum, 15A,
15B...Auxiliary traverse rope, 16A, 16B...
Auxiliary drum, 19A, 19B... sprocket,
20A, 20B... Sprocket, 21A, 21
B...Chain, 22...Reducer, 23...Main drive motor, 24A, 24B...Drum shaft, 25
A, 25B...Electromagnetic clutch, 26A, 26B...
...Reducer, 27A, 27B...Auxiliary drive motor,
28A, 28B...Electromagnetic clutch.

Claims (1)

[Claims for Utility Model Registration] A girder supported horizontally by a leg structure, a main trolley movable along the girder,
The main trolley moving drive means includes a wire rope connected to the main trolley, a drum for driving the wire rope, and a rotational drive device for rotating the drum, and the main trolley is moved along the girder. In a rope trolley type bridge crane of the type in which one end of the rope is fixed to the end of the girder, a 1 that is movably disposed along the girder between the main trolley and each end of the girder and supports a hoisting wire rope. a pair of auxiliary trolleys, a wire rope connected to each of the auxiliary trolleys, an auxiliary drum for driving the wire rope, and a driving force transmission mechanism for transmitting rotational driving force from the rotary drive device to the auxiliary drum; an auxiliary trolley moving drive means for moving the trolley in the same direction as the main trolley at approximately 1/2 the moving speed; a first clutch interposed in each of the driving force transmission mechanisms; and a second clutch for moving each of the auxiliary drums. A wire rope slack prevention device for a rope trolley type bridge crane, characterized in that it is equipped with an auxiliary rotation drive device that rotates through the wire rope.