JPH0512224Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, a truck crane or the like used to load containers unloaded from a container ship to a container yard from the container yard onto a truck or the like. This relates to a container crane hoisting device.

[Prior art]

As shown in FIG. 9, in a container crane 23 such as a transfer crane used to load containers 21 stored in a container yard 20 onto trucks 22, a spreader 2
the hoisting device 2 while gripping the container 21
4, hoisting and lowering are carried out, and the cargo handling work is carried out.

Therefore, the hoisting device 24 that is conventionally used is
As shown in FIG. 10, two ropes 12 are suspended directly below the horizontal drum 1 and stretched so as to be able to wind up and lower the two upper sheaves 6 of the spreader 2 provided at one end of the spreader 2. , one of the ropes 12 is fixed with the rope fixed end 9,
The other rope 12 is fixed to one end of the lever 3A of the small swing device 3 via the small swing sheave 10.

In addition, one additional layer is connected to the drum 1 via two horizontal sheaves 4 provided at orthogonal positions in the horizontal direction.
Two ropes 11 are stretched so as to be able to wind up and lower the two upper sheaves 6 of the spreader 2 provided at the other end of the spreader 2 through the vertical sheaves 5, respectively. The rope is fixed at the fixed end 7, and the other rope 11 is fixed to the other end of the lever 3A of the small swing device 3 via the small swing sheave 8.

However, in the above hoisting device 24, the rope 11 is bent twice through the horizontal sheave 4 and the vertical sheave 5, and the rope 11 is severely damaged compared to the rope 12 suspended directly below the drum 1. There is a problem in that the lifespan is halved.

In recent years, the hoisting speed of this type of container hoisting device has been increasing year by year, and the load has been increasing, so extending the rope life of this hoisting roping mechanism has become an important issue.

Therefore, the present inventors replaced the horizontal sheave 4 and vertical sheave 5 shown in FIG. 10 with the oscillating sheave 13 shown in FIG.
We have conducted repeated studies focusing on the fact that the lifespan of 1 can be doubled compared to conventional products.

On the other hand, the hoisting roping mechanism hoists and lowers the spreader 2, and changes the length difference between the left and right ropes 11 and 12 by tilting the lever 3A of the small swing device 3. Make a small turn of about ±5°, and
It has a function of tilting the entire container 21, and also has a function of preventing the spreader 2 from swinging when the hoisting device 24 stops moving horizontally.
These functions need to be fully satisfied even if the oscillating sheave 13 is adopted.

That is, the position of the oscillating sheave 13 shown in FIG. 12, which is placed in place of the horizontal sheave 4 and the vertical sheave 5, is restricted by the relationship of the fleet angle between the drum 1 and the rope 11, and the position of the swinging sheave 13 shown in FIGS. As shown, the ropes 12 and 11 have different roping angles at both ends of the spreader 2, that is, the left and right sides, and the directions of the rope resultant forces 14 and 15 do not match.

For this reason, there is a problem in that the swing when the traversing is stopped becomes unbalanced between the left and right sides, and the amplitudes of the left and right sides of the container 21 and the spreader 2 are different.

Therefore, the inventors of the present invention conducted various experiments using actual machines, and found that if the directions of the rope resultant forces 15 and 14 on the rope 11 side and the rope 12 side are made the same, the deflection at the time of stopping the traverse can be reduced from left to right. After confirming that there was no imbalance, we arrived at the present invention.

[Purpose of invention]

The present invention was made to solve the above-mentioned conventional problems, and by adopting an oscillating sheave, the life of the rope can be extended, and even with the use of an oscillating sheave, small turns can be achieved. Another object of the present invention is to provide a container crane hoisting device that maintains a hoisting roping mechanism without impairing the steady rest function.

[Structure of the idea]

To achieve the above object, the container crane hoisting device of the present invention has two spretzers suspended directly below a drum, which is a horizontally installed rope hoisting device, and provided at one end of the left and right ends of the spreader. Two ropes are attached to the other end of the spretzer via two ropes stretched so that the upper sheave can be hoisted up and down, and two oscillating sheaves installed at horizontal positions perpendicular to the drum. It has two ropes stretched so as to be able to hoist up and lower the upper sheaves of the spreader, and furthermore, each of the upper sheaves of the spreader has two ropes stretched so that the directions of the resultant force of the two ropes at both the left and right ends of the above-mentioned spreader coincide with each other. It is constructed by making the position of the rope support point adjustable.

Therefore, the above-mentioned oscillating sheave performs the functions of two sheaves, a horizontal sheave and a vertical sheave, which were conventionally provided, but the rope bends at one place instead of two, so the rope can be bent at one place. The damage will be halved.

First, since the direction of the resultant force of each of the two ropes at both the left and right ends of the spreader is made to match, the swing of this hoist when it stops traversing does not become unbalanced on the left and right, and the swing It will function as a stop.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a container crane hoisting device in an embodiment of the present invention, and FIG. 3 is a front view illustrating the operation of the oscillating sheave shown in FIG. 1, FIG. 4 is an enlarged side view of the oscillating sheave shown in FIG. 1, and FIG. 5 is a front view of FIG. FIG. 6 is an explanatory view showing the direction of the rope resultant force of each rope in FIG. 1, and FIGS. 7 and 8 are front views of main parts of a device for adjusting the support point position of each rope of the hoisting device in FIG. 1. .

First, the container crane hoisting device of this embodiment hoists and lowers the spreader 2 for loading and unloading the container 21 in the container crane 23 of FIG. This embodiment has substantially the same structure and function as the conventional example shown in FIG. 10, and the same parts between this embodiment and the conventional example are indicated by the same part numbers.

Further, regarding the common points with the conventional example, the descriptions of those explained in the conventional example will be omitted, and only the differences will be described here.

First, the horizontal sheave 4 and vertical sheave 5 of the conventional example shown in FIG. 10 are replaced with two oscillating sheaves 13 as shown in FIG. The two upper sheaves 6 of the spreader 2 provided at the other end of the spreader 2 are stretched so as to be able to be rolled up and lowered through two swinging sheaves 13 provided at directional positions.

That is, as shown in FIG. 3, as the spreader 2 is lowered as shown by the solid line or hoisted up as shown by the broken line, the oscillating sheave 13 of the rope 11
Since the angle of the rope 11 changes, the oscillating sheave 13 is provided rotatably around the oscillating rotation shaft 17 as shown in FIGS. 4 and 5, so as to correspond to changes in the angle of the rope 11. ing.

Next, the rope support shown in FIG. 11 is made so that the directions of the rope resultant force of each rope 11 and 12 at both left and right ends of the spreader 2, that is, the rope resultant force 15 of FIG. 12 and the rope resultant force 16 of FIG. The horizontal distance l between them can be set as horizontal distance l+α in FIG.

That is, the rope 1 at low lifting height as shown by the solid line in FIG.
The rope end position is moved by a distance L from H ₁ at low lift to H ₂ at high lift so that the rope resultant forces 15 and 16 match at high lift as shown by broken lines 1 and 12. There is.

In this case, if the rope support point position is the rope fixed end 9 as shown in FIG. 2, the position of the rope fixed end 9 can be adjusted using a hydraulic cylinder 30 or a power cylinder with a stroke L as shown in FIG. In addition, if the rope support point positions are two small turning sheaves 10 as shown in FIG.
As shown in the figure, the rope fixed end position of these sheaves 10 for small swings can be adjusted within the range of the stroke L using a hydraulic cylinder 30 or the like together with the same frame 31.

As described above, by matching the directions of the rope resultant forces 15 and 16 on the rope 11 side and the rope 12 side, it is possible to prevent the swinging of the spreader 2 from becoming left-right unbalanced when the hoisting device stops traversing. , together with the spreader 2, the left and right amplitudes of the container 21 can be made the same.

That is, for this purpose, the horizontal distance l between the rope fixed end 9 and the small turning sheave 10 is set at a position that is increased by α as shown in FIG. Just make it the right amount.

In addition, if the steady rest is often used at a constant lift, the horizontal distance l+α between the rope fixing 9 and the small turning sheave 10 should be fixed at a constant value so that the rope resultant forces 15 and 16 match at that lift. It is also possible.

In addition, in order to make the rope resultant forces 15 and 16 match, it is necessary to reduce the horizontal spacing force l between the rope fixed end 7 and the small turning sheave 8 in FIG.
The position of the support point of each rope 11, 12 can be adjusted by widening the interval between the sheaves 6 on the rope 11 side.

[Effect of idea]

As explained above, the container crane hoisting device of the present invention has the effect of doubling the life of the rope compared to conventional ones by adopting the oscillating sheave. This has the advantage of being able to provide a hoisting device that is compatible with

In addition, since the direction of the rope resultant force of each rope at both the left and right ends of the spreader can be matched, even if an oscillating sheave is used, the swing will not become unbalanced on the left and right when the traverse stops. It has the advantage of being able to fully demonstrate its steady rest performance.

The present invention can be effectively applied mainly to transfer cranes for containers and the like.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a container crane hoisting device according to an embodiment of the present invention, Fig. 2 is a front view taken in the A-A direction of Fig. 1, and Fig. 3 is the operation of the oscillating sheave shown in Fig. 1. 4 is an enlarged side view of the oscillating sheave shown in FIG. 1, FIG. 5 is a front view of FIG. 4, and FIG. 6 shows the direction of the rope resultant force of each rope in FIG. 1. 7 and 8 are front views of main parts of the device for adjusting the support point position of each rope of the hoisting device shown in FIG. 1, FIG. 9 is a front view of the overall arrangement of the container crane, and FIG. FIG. 11 is a perspective view of a conventional container crane hoisting device, FIG. 11 is a front view taken along the line B-B in FIG. 10, and FIG. 12 is a perspective view of the hoisting device of FIG. C-C in Figure 10
It is a front view of direction. 1...Drum, 2...Spreader, 6...Spreader upper sheave, 11, 12...Rope, 13...
...oscillating sheave, 30...hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] Suspended directly below drum 1, and spreader 2
It has two ropes 12 stretched so as to be able to raise and lower the two upper sheaves 6 of the spreader provided at one end thereof, and two necks provided at horizontal positions orthogonal to the drum 1. It has two ropes 11 stretched so as to be able to wind up and lower the two upper sheaves 6 of the spreader 2 provided at the other end of the spreader 2 via the swinging sheave 13, and furthermore, Each 2 in the section
A container crane hoisting device characterized in that support point positions 9 and 10 of each rope 11 and 12 are adjustable so that the directions of the rope resultant forces 15 and 16 can be made to match each other.