JPS6053141B2 - Labor-saving grab work boat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a graph work boat, and particularly to a power-saving grab work boat that is capable of saving a part of the power required for raising the graph during a lift operation.

When performing graph work such as dredging using a graph work device mounted on a work boat, generally the graph is first lowered by its own weight, then grips a heavy object such as earth and sand, and then is moved together with the gripped heavy object by a winch. It is lifted by a power drive device such as.

By the way, for example, in the case of a graph packet for a dredging machine, even a standard size graph packet can reach tens of tons in weight, and when the weight of heavy objects such as earth and sand is added to this, the weight becomes considerable. Frequently lifting large loads requires a large source of power energy. Therefore, in graph work vessels that carry out dredging work, etc.
If the power required to raise the graph packet can be reduced, the energy savings will be significant.
Therefore, the main object of the present invention is to provide a power-saving grab work boat that can effectively reduce the power required for raising the graph packet.

In order to achieve the above object, the present invention includes a workbench supported on a barge in a horizontal plane so as to be freely movable; a boom rotatably supporting a sheave at its tip; a main rope installed through at least the sheave so that the grab bucket can be raised and lowered by a main winch on the work platform; In a work vessel having at least an auxiliary rope erected through the sheave, such as can be carried out by an auxiliary winch on a work platform, weight reducing the weight of the grab bucket conveyed to the main winch via the main rope. The weight reducing device includes a weight reducing device and a disabling device for disabling the operation of the weight reducing device at any time. and a load adjustment cable 20 whose other end is connected to the grab bucket via the sheave to offset the suspended weight of the weight with a part of the weight of the grab bucket; The present invention is characterized by comprising a weight driving device provided on the barge and capable of independently driving the weight upward.

Hereinafter, one embodiment of the present invention will be described according to the drawings. On the barge 2 of the work boat 1, there is a swivel platform 4 in front of the cabin 3.
A workbench 5 is mounted on the swivel table 4 so as to be freely rotatable in a horizontal plane.

At the front of the workbench 5, the proximal end of a boom 6, which has a sheave 7 pivotally supported at its distal end, is pivotally supported by known means so as to be freely raised. A sheave 9 is installed at the upper end of the workbench 5.
The support frame 8 that pivotally supports the is supported, and a drive (not shown) is supported. A main winch 10 and an auxiliary winch 11 are installed, each of which is independently rotationally driven by a moving device. One end of a main rope 19 is locked to the upper end of the main body frame 18 of the grab bucket 17, and the other end of the main rope 19 passes through the main rope groove of the sheave 7. After that, the rope is wound around the main winch 10 through the main rope groove of the sheave 9. Therefore the main winch 1
0 can be rotated in the winding direction to raise the grab bucket 17. Further, an upper sheave 21 and a lower sheave 24 are respectively pivotally supported at the upper end of the main body frame 18 of the grab bucket 17 and near the pivot portion 23 of the pair of packets 22, 22'', and between these sheaves 21, 24. One end of the auxiliary rope 25 is wound around the auxiliary rope 25, and the other end of the auxiliary rope passes through the auxiliary rope groove of the sheave 7, passes through the auxiliary rope groove of the sheave 9, and is wound around the auxiliary winch 11. .

Then, while the main winch 10 is stopped, the auxiliary winch 1 is
1 is rotated in the winding direction, a pair of packets 22
, 22'' by pulling up the pivot 23 of the packets 22,
22'' can be rotated in the closing direction.
This is a structure of a conventionally known club work boat, but the present invention provides a main winch 1 to the club work boat 1 via a main rope 19.
It is specially equipped with a weight reducing device A that reduces the weight of the grab bucket 17 that is transmitted to the vehicle, and a disabling device B that disables the operation of the weight reducing device A at any time.
Next, the structures of these devices A and B will be explained in detail.

At the rear of the workbench 5, a weight lifting guide device 13, which houses a weight 16 so as to be able to rise and fall freely, is disposed.A pair of fixed pulleys 14 are installed at the upper end of the weight lifting guide device 13. ，
1' are supported coaxially and relatively rotatably with each other.
The weight 16 is guided up and down by sliding contact with the inner wall of the weight lifting guide device 13, and a pair of movable pulleys is provided above the weight 16 in correspondence with the pair of fixed pulleys. 15,1
5'' are coaxially supported with respect to each other so as to be rotatable relative to each other.
A weight 16 is placed between one of the fixed pulleys 14 and the movable pulley 15.
One end of the load adjustment cable 20 is wound around the load adjustment cable 20 to suspend it, and the end thereof is tied to the upper part of the weight lifting guide device 13, and the other end of the adjustment cable 20 is wound around the main rope of the sheave 7. It is tied to the upper end of the main body frame 18 of the grab bucket bag 17 via the groove. Thus, the load adjustment cable 20 can offset a portion of the suspended weight of the weight 16 and the weight of the grab bucket 17. Further, the invalidating device B is constituted by a weight driving device U that can independently drive the weight 16 upward, and
The weight driving device U includes a weight driving winch 12 installed on a workbench 5, and a weight driving winch 12 that is paid out from the winch 12, and after the free end passes through the other fixed pulley 1C and movable pulley 15'', the weight is driven. A weight driving cable 26 is attached to the upper part of the device U.

Therefore, if the weight drive winch 12 is rotationally driven in the winding direction by a drive device (not shown), the weight 16 can be independently driven upward via the weight drive cable 26, and as a result, the entire weight 16 can be lifted. The weight can be temporarily transferred to the weight-driven winch 12. With the structure described above, the grab bucket 17 can be used for dredging work, for example.
When descending, the main winch 10 and the auxiliary winch 11 let out the main rope 19 and the auxiliary rope 25 to the same extent, and the weight drive winch 12 lets out the weight drive rope 2.
6 is wound up gently to the extent that it does not loosen and get tangled, the grab bucket 17 descends due to its own weight, and as it descends, the weight 16 ascends the weight lifting guide device 13.

When the grab bucket 17 reaches the water bottom 27, the main winch 10 and the auxiliary winch 11 are operated in conjunction with each other to rotate the pair of saw packets 22, 22'' to scoop up the earth and sand on the water bottom 27.

By the way, while the grab bucket cart 17 is descending, part of its weight is offset by the weight 16, so the descending speed of the grab bucket cart 17 is slower than when there is no weight 16.

Therefore, if the water bottom 27 is soft, the pair of packets 22, 22'' can easily scoop up the earth and sand, but if the water bottom 27 is a particularly hard ground, the descending speed of the grab bucket 17 may be reduced. In particular, it is necessary to quickly force the pair of packets 22, 22'' to the bottom of the water and then rotate the pair of packets 22, 22'. In this case, the weight drive cable 26 is moved by the weight drive winch 12 when or just before the grab bucket 17 is lowered.
The descending speed of the grab bucket 17 can be increased by rapidly winding up the weight and operating the weight of the weight 16 to be independently supported by the weight drive winch 12 via the weight drive cable 26. . When lifting the grab bucket 17 with or without a heavy load such as earth and sand, the main rope 19 and the auxiliary rope 25 are wound up by the main winch 10 and the auxiliary winch 11, and the weight drive winch 12 is moved freely. When switching to the state and letting out the weight drive cable 26, part of the weight of the grab bucket 17 is offset by the weight 16, and the grab bucket 17 can be raised with a relatively small amount of power. The accompanying weight 16 descends within the weight lifting guide device 13.

The weight 16 is disposed so as to move up and down along the back of the workbench 5, so it always functions to offset the unbalanced moment of the workbench. Since it is suspended and supported via the grab bucket 17, its lifting and lowering strokes are much shorter than the lifting and lowering strokes of the grab bucket cart 17.

As described above, according to the present invention, the workbench 5 is supported on the barge 2 in a horizontal plane so that it can be rotated freely, and the base end is pivotally supported by the workbench 5 so that it can be raised up. Also, a boom 6 that rotatably supports a sheave 7 at its tip, and a main rope 19 installed through at least the sheave 7 so that the grab bucket 17 can be raised and lowered by the main winch 10 on the workbench 5. In the work boat 1, the work boat 1 has an auxiliary rope 25 installed via at least the sheave 7 so that the packets 22, 22'' of the grab bucket 17 can be opened and closed by the auxiliary winch 11 on the work platform 5. A weight reducing device A is provided to reduce the weight of the grab bucket 17 that is transmitted to the main winch 10 via the main rope 19. And this weight 16
a load adjustment cable 20 which is suspended at one end and whose other end is tied to the grab bucket 17 via the sheave 7 to offset the suspended weight of the weight 16 with a part of the weight of the grab bucket 17; Therefore, when the grab bucket cart 17 is raised, the winding load of the main winch 10 can be reduced by the weight of the weight 16, and therefore, the power required for lifting the grab bucket cart 17 can be effectively saved. The energy saving effect is significant.

Furthermore, when the grab bucket cart 17 descends, the speed of descent is relatively slow due to the operation of the weight reduction device A, but in the present invention, in order to disable the operation of the weight reduction device A at any time, the weight 16 is moved independently at any time. Since it is equipped with a disabling device B consisting of a weight driving device U that can be driven upward at During dredging work, the grab bucket 17 is made to collide with the bottom of the water with force, contributing to improving the efficiency of the dredging work.

[Brief explanation of drawings]

FIG. 1 is an overall side view of a labor-saving club work boat according to an embodiment of the present invention, and FIG. 2 is a plan view of the labor-saving club work boat of FIG. 1. A: Weight reduction device, B: Nullification device, U: Weight drive device, 1: Work boat,
2... Barge, 5... Workbench, 6...
...Boom, 7...Sheave, 10...
・Main winch, 11...Auxiliary winch, 16・
... Weight, 17 ... Grab bucket, 1
9... Main rope, 20... Load adjustment rope, 2
2, 22'...bucket, 25...auxiliary rope.

Claims (1)

[Scope of Claims] 1. A workbench 5 supported on the barge 2 in a horizontal plane so as to be freely movable; a boom 6 rotatably supporting a sheave 7; a main rope 19 installed through at least the sheave 7 so that the grab basket 17 can be raised and lowered by a main winch 10 on the workbench 5; In the work boat 1, the main rope has an auxiliary rope 25 installed at least through the sheave 7 so that the opening and closing operations of the 17 buckets 22, 22' can be performed by the auxiliary winch 11 on the work platform 5. The weight reducing device A is provided with a weight reducing device A for reducing the weight of the grab basket 17 transmitted to the main winch 10 via the main winch 19, and a disabling device B for disabling the operation of the weight reducing device A at any time. The weight 16 is arranged on the barge 2 so as to be able to rise and fall freely, and the weight 16 is suspended from one end and the other end is connected to the grab basket 17 via the sheave 7. The nullifying device B is provided on the barge 2 to offset the suspended weight of the weight 16 with a part of the weight of the grab basket 17. A labor-saving grab work boat characterized by being composed of a weight drive device U that can be driven upward independently. 2. The weight 16 is a balancing weight that moves up and down at a position that offsets the unbalanced moment of the workbench 5. A labor-saving grab work boat according to claim 1.