JP6924937B2 - Grab bucket - Google Patents

Description

The present invention relates to a grab bucket mainly used for dredging work and the like.

Conventionally, a grab bucket has been widely used for dredging sediment deposited on the seabed.

The grab bucket consists of an upper block suspended by an elevating device such as a crane, a lower block arranged under the upper block, a pair of shells rotatably supported by the lower block, and an upper end rotating to the upper block. It has a pair of arms that are possibly supported and whose lower end is rotatably connected to the shell, by opening and closing both shells in conjunction with the ascent and descent of the lower block relative to the upper block, i.e. by lowering the lower block. Both shells rotate in the grab opening direction, and when they rise, both shells rotate in the grab closing direction.

Then, in the dredging work by the grab bucket, the grab bucket is lowered to the bottom of the water with both shells open, and the cutting edges of both shells are made to bite into the bottom of the water. It takes in the earth and sand and grabs the earth and sand.

JP-A-2010-159545

However, in the conventional technique as described above, when both shells are closed from the state where the cutting edge is bitten into the bottom of the water, the bottom sediment is collected toward the center side in the shell rotation direction by both shells to be closed, and the pressure thereof. There was a risk that earth and sand would be pushed out horizontally from between the two shells and the pollution would spread.

Further, at that time, if the excavation position is adjacent to the already excavated position, the earth and sand pushed in the horizontal direction may be pushed out to the already excavated part and the already excavated part may be backfilled.

Furthermore, when the grasped earth and sand are temporarily placed somewhere, both shells are rotated in the opening direction, and when the grab is opened, the contents such as earth and sand may diffuse horizontally from between the two shells. there were.

Therefore, in view of such conventional problems, the present invention has been made for the purpose of providing a grab bucket capable of preventing the diffusion of contents such as earth and sand due to the opening and closing of both shells.

The feature of the invention according to claim 1 for solving the above-mentioned conventional problem is that an upper block supported by a hanging wire, a lower block arranged under the upper block, and rotation to the lower block. A pair of shells having shell side plates on both sides of a possibly supported shell bottom plate, and an arm whose upper end is rotatably supported by the upper block and whose lower end is rotatably connected to the side surface of the shell. with the door, said two shells is made of a leading edge and a leading edge of both the shell side plate portions of the lower block the shell bottom plate portion by relatively raised with respect to the upper block by the winding operation of the operation wire The openings are closed by abutting against each other, and the lower block is lowered relative to the upper block by the feeding operation of the operation wire, and the tip edge of the shell bottom plate portion and the tip edge of both shell side plate portions. in grab bucket but which is opened by rotating in a direction away from each other, wherein disposed on the side of each shell, comprising a diffusion prevention means which is disposed across between the shell side plate portions at the shell opening, said anti-diffusion The means is provided with a diffusion prevention plate suspended from the lower block, and when the shell is lowered toward the bottom of the water with the shell open, the diffusion prevention plate is inserted into the bottom of the water and the inside and outside of both shells. The earth and sand located in the above are separated by the diffusion prevention plate .

The feature of the invention according to claim 2 is that, in addition to the configuration of claim 1 , the diffusion prevention means extends from a base end portion fixed to the shell side plate portion to the other shell side in the rotation direction of the shell. It has a plate.

Outer features of the invention described in claim 3, in addition to the configuration of claim 2, which is an inner plate fixed to the shell side plate inner surface of one of the shells, fixed to the shell side plate outer surface of the other of said shell A plate is provided, and when both shells are closed, the inner plate and the outer plate are overlapped with each other inside and outside the shell side plate portion of the other party.

By providing the configuration according to claim 1, the dredging method according to the present invention can prevent the diffusion of earth and sand due to the opening and closing operation of the shell. Further, in the present invention, the diffusion prevention plate is inserted into the earth and sand so that the side portions of the shell can be separated inside and outside.

Further, in the present invention, by providing the configuration according to claims 2 and 3, when the shell is closed, the plate is suitably housed without interfering with the shell, and the plate is interlocked with the rotation operation of the shell. Has been deployed to allow the sides of the shell to be isolated inside and outside.

It is a front view which shows an example of the grab bucket which concerns on this invention. It is the same side view. It is a front view which shows the state at the time of opening of the grab bucket of the same above. It is a side view which shows the state at the time of opening of the grab bucket of the same above. It is a front view which shows another example of the grab bucket which concerns on this invention. It is a front view which shows the state at the time of opening of the grab bucket of the same above. It is a front view which shows still another example of the grab bucket which concerns on this invention. It is a front view which shows the state at the time of opening of the grab bucket of the same above.

Next, the first embodiment of the grab bucket according to the present invention will be described based on the examples shown in FIGS. 1 to 4.

As shown in FIGS. 1 and 2, the grab bucket 1 includes a support 3 supported by suspension wires 2 and 2, a pair of shells 4 and 4 rotatably supported by the support 3, and a shell 4. , 4 is provided with a grab opening / closing mechanism for operating in the opening / closing direction, and both shells 4 and 4 form a grab that can be opened / closed.

The support 3 has an upper block 5 supported by suspension wires 2 and 2, a lower block 6 arranged under the upper block 5, an upper end rotatably supported by the upper block 5, and a shell 4 and a lower end. Arms 7 and 7 rotatably connected to the side surface portion of 4 are provided, and the upper ends of the shells 4 and 4 are rotatably supported by the lower block 6 via a support shaft 8 and the side portions are rotatably supported. It is connected to the upper block 5 via the arms 7 and 7.

The upper block 5 is suspended by a crane 9 which is a bucket moving means via suspension wires 2 and 2, and the entire grab bucket 1 can be moved in the vertical direction and the horizontal direction by the crane 9.

The lower block 6 moves up and down relative to the upper block 5 by the feeding / winding operation of the operation wire 10.

Then, each of the shells 4 and 4 opens and closes in conjunction with the ascending and descending of the lower block 6 relative to the upper block 5, that is, by descending, both shells 4 and 4 rotate in the grab opening direction and ascend. As a result, both shells 4 and 4 rotate in the grab closing direction.

Each of the shells 4 and 4 includes an arc-shaped shell bottom plate portion 4a and front and rear shell side plate portions 4b and 4b connected to both side edges of the shell bottom plate portion 4a, and the upper ends of the shell side plate portions 4b and 4b are lower blocks. When both shells 4 and 4 are rotatably supported by 6 via a support shaft 8 and both shells 4 and 4 are closed, that is, when the grab is in a gripping state, the cutting edge portion of the lower edge of the shell bottom plate portion 4a and both shells. The mating side edges of the side plate portions 4b and 4b are in close contact with each other, and the grab is closed.

Further, the grab bucket 1 is provided with diffusion prevention means for preventing the diffusion of earth and sand when the shell is opened and closed.

The diffusion prevention means includes, for example, a diffusion prevention plate 11 arranged outside the shell side plate portion 4b, and the diffusion prevention plate 11 is connected to the lower block 6 via connecting members 12 and 12.

The diffusion prevention plate 11 is made of a plate material having rigidity such as a steel plate whose width direction is directed up and down, and is inserted into the bottom ground 13 as the grab bucket 1 descends.

The upper ends of the connecting members 12 and 12 are fixed to the lower block 6, and the lower end side is fixed to the outer surface of the diffusion prevention plate 11.

The connecting members 12 and 12 may be provided with a buffering means for absorbing an impact in the vertical direction. In that case, it can be expected that the resistance that the diffusion prevention plate 11 receives from the bottom ground 13 is alleviated.

Although not particularly shown, the cushioning means is provided with an elongated hole at the upper end of the connecting member 12, and the upper end of the connecting member 12 is slidably fixed to the lower block 6 by a fixing tool such as a bolt passed through the elongated hole. The connecting member 12 itself may have a structure that can be expanded and contracted.

When the grab bucket 1 configured in this way is lowered toward the bottom ground 13 with both shells 4 and 4 open, they are arranged outside the shells 4 and 4 as shown in FIGS. 3 and 4. Both diffusion prevention plates 11 are inserted into the bottom ground 13, and earth and sand located on the inner and outer sides of the sides of both shells 4 and 4 are separated by the diffusion prevention plates 11.

When both shells 4 and 4 are rotated in the closing direction, the earth and sand on the bottom of the water is scraped to the center side in the shell rotation direction by both shells 4 and 4 trying to close, and the pressure from between the two shells 4 and 4 Attempts to be pushed out horizontally.

However, since the earth and sand located on the inner and outer sides of the sides of both shells 4 and 4 are separated by the diffusion prevention plate 11, the earth and sand located on the inner side is blocked by the diffusion prevention plate 11 and does not diffuse. It is taken into shells 4 and 4.

Further, in this grab bucket 1, even when the grabbed earth and sand are temporarily placed somewhere, both shells 4 and 4 are rotated in the opening direction, and when the grab is opened, between both shells 4 and 4. The earth and sand that tends to diffuse in the horizontal direction is blocked by the diffusion prevention plate 11, and the diffusion of the earth and sand can be prevented.

The mode of the diffusion prevention means is not limited to the above-described embodiment, and for example, as shown in FIGS. 5 and 6, the plates 20 and 21 fixed to the shell side plate portions 4b and 4b are provided. There may be. The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

The plate includes an inner plate 20 fixed to the inside of the shell side plate portion 4b of one shell 4 and an outer plate 21 fixed to the outside of the shell side plate portion 4b of the other shell 4, and both shells 4 and 4 are provided. When closed, the inner plate 20 and the outer plate 21 are overlapped with each other inside and outside the shell side plate portion 4b of the other party, and when the shells 4 and 4 are opened, they are deployed to the front and rear sides of the shells 4 and 4. It has become like.

The inner plate 20 is made of a rigid plate material such as a steel plate, and extends from the base end portion 20a fixed to the opening side edge of the shell side plate portion 4b and the base end portion 20a toward the mating shell side in the shell rotation direction. It is integrally provided with a diffusion prevention unit 20b.

Although not detailed in the figure, the base end portion 20a is firmly fixed to the inside of the shell side plate portion 4b by bolting, welding, or the like.

The diffusion prevention portion 20b is formed in a shape consistent with the shell side plate portion 4b, and is accommodated inside the mating shell 4 when both shells 4 and 4 are closed.

The outer plate 21 is made of a rigid plate material such as a steel plate, and extends from the base end portion 21a fixed to the opening side edge of the shell side plate portion 4b and the base end portion 21a toward the mating shell side in the shell rotation direction. It is integrally provided with a diffusion prevention unit 21b.

Although not described in detail in the figure, the base end portion 21a is firmly fixed to the outer opening side edge of the shell side plate portion 4b by bolting, welding, or the like.

The diffusion prevention portion 21b is formed in a strip shape in which the end side edge is integrally supported by the base end portion 21a and extends toward the mating shell side in the shell rotation direction.

When the grab is closed, the outer plate 21 is overlapped on the outside of the shell side plate portion 4b as shown in FIG. 5 so as not to interfere with the other shell 4.

Then, in the open state of the grab, as shown in FIG. 6, the inner plate 20 and the outer plate 21 are expanded to the lower side of the shells 4 and 4 with the rotation of the shells 4 and 4, and both shells 4 and 4 are deployed. It is arranged so as to straddle between the shell side plate portions 4b and 4b.

In addition to the above-described embodiment, as shown in FIGS. 7 and 8, the plates 30 and 30 fixed to the shell side plate portions 4b of the shells 4 and 4 and the diffusion prevention plate 31 connected to the lower block 6 May be used in combination. The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

Further, in the above-described embodiment, an example in which the grab bucket according to the present invention is applied to the dredging work has been described, but the usage mode of the grab bucket according to the present invention is not limited to the dredging work, for example, a loose object. It may be applied to transportation.

Further, in the above-described embodiment, the example in which the diffusion prevention means is arranged on both sides of the shell has been described, but it may be arranged only on one side.

1 Grab bucket 2 Suspended wire 3 Support 4 Shell 5 Upper block 6 Lower block 7 Arm 8 Support shaft 9 Crane 10 Operation wire 11 Diffusion prevention plate 12 Connecting member 13 Water bottom 14 Grab dredger 15a, 15b Sediment 16 Earth carrier 20 Inside Plate 21 Outer plate 30 Plate 31 Anti-diffusion plate

Claims (3)

An upper block supported by a hanging wire, a lower block arranged under the upper block, a pair of shells having shell side plates on both sides of a shell bottom plate rotatably supported by the lower block, and an upper end. Is rotatably supported by the upper block, and the lower end is rotatably connected to the side surface portion of the shell. Both shells raise the lower block by winding an operation wire. The lower block is closed by abutting the tip edge of the shell bottom plate portion and the tip edge of both shell side plate portions relative to the block, and the lower block is pulled out by the feeding operation of the operation wire. In a grab bucket that is lowered relative to the upper block and is opened by rotating the tip edge of the shell bottom plate portion and the tip edge of both shell side plate portions in a direction away from each other.
It is provided with diffusion prevention means which is arranged on the side of each of the shells and is arranged so as to straddle between the shell side plates when the shell is opened.
The diffusion prevention means includes a diffusion prevention plate suspended from the lower block, and when the shell is lowered toward the bottom of the water with the shell open, the diffusion prevention plate is inserted into the bottom of the water and both shells. A grab bucket characterized in that earth and sand located on the inner and outer sides of the water are separated by the diffusion prevention plate. The grab bucket according to claim 1 , wherein the diffusion prevention means includes a plate extending from a base end portion fixed to the shell side plate portion to the partner shell side in the rotation direction of the shell. An inner plate fixed to the inner surface of the shell side plate portion of one of the shells and an outer plate fixed to the outer surface of the shell side plate portion of the other shell are provided, and when both shells are closed, the inner plate and the said The grab bucket according to claim 2 , wherein the outer plates overlap each other inside and outside the shell side plate portion of the other party.

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