JP6808207B1 - Dredging grab bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to more easily adjust a bucket capacity in a dredging grab bucket whose bucket capacity can be changed to a large or small size. According to the present invention, when a pair of bucket shells 4 are in a closed posture, the joint surfaces P of the shell bodies 13 included in each bucket shell 4 are in close contact with each other, and the internal space of the pair of shell bodies 13 is sealed. The target is a closed type grab bucket for dredging. The shell body 13 is formed of a shell bottom wall 20 that scoops the object to be gripped, a shell front wall 23 and a shell rear wall 24 that are continuous in front of and behind the shell bottom wall 20, and each of these shell walls 20, 23, 24. It has a shell upper wall 21 that closes the opening. Inside the shell body 13 surrounded by each wall 20, 21, 23, 24, a plurality of sealed bag-shaped adjusting bags 30 that are expanded and contracted by filling and discharging fluid are provided, and the number of adjusting bags 30 to be expanded is adjusted. Then, adjust the bucket capacity to a large or small size. [Selection diagram] Fig. 1

Description

The present invention relates to a dredging grab bucket used for dredging silt and earth and sand accumulated on the seabed, and among them, a dredging capable of changing the bucket capacity defined by the internal volume when a pair of shell bodies are closed. For grab buckets.

The applicant has previously proposed Patent Document 1 as this type of dredging grab bucket. The dredging grab bucket of Patent Document 1 is configured so that a capacity adjusting block formed of a hollow box body can be attached to and detached from the inside of the shell body. The bucket capacity can be changed to a large or small size by adjusting the number of capacity adjusting blocks mounted on the bucket shell and reducing the internal volume when the pair of shell bodies are closed by the capacity adjusting blocks. However, in the grab bucket of Patent Document 1, it is inevitable that the weight of the capacity adjusting block made of steel becomes large, and it is necessary to use a winch to attach / detach the block. Therefore, it is necessary to route the hanging wire and attach / detach the capacity adjusting block to / from the hanging wire. Furthermore, fine winch operation is required to align the insertion holes between the bracket and the connecting piece of the capacity adjusting block. There was room for improvement in that it took time and effort for attachment / detachment work and adjustment work.

Therefore, the applicant has proposed Patent Document 2 in order to improve the above problems. In the dredging grab bucket of Patent Document 2, the inside of the bucket shell is divided into a plurality of ward rooms, and a planar partition body for defining a volume reduction space can be detachably connected inside the ward room. It is configured. The bucket capacity can be changed to a large or small size by adjusting the number of compartments mounted on the shell body to increase or decrease the total volume of the volume reduction space.

Japanese Patent No. 5240801 Japanese Patent No. 5531317

In the dredging grab bucket of Patent Document 2, since the volume reduction space is defined by a planar compartment that is lighter and simpler than the capacity adjustment block, the bucket capacity is changed as compared with the attachment / detachment of the capacity adjustment block to the shell body. You can save the trouble of. However, even in the dredging grab bucket of Patent Document 2, when the volume reduction space is defined or the volume reduction space is released, it is necessary to attach / detach the planar partition body. Therefore, further reduction of labor required for capacity adjustment has been required.

An object of the present invention is to make it possible to more easily adjust the bucket capacity in a dredging grab bucket whose bucket capacity can be changed to a large or small size.

The dredging grab bucket according to the present invention includes a pair of left and right bucket shells 4 that are openably and closably supported by a shell shaft 3 provided on the lower frame 2, and when the pair of bucket shells 4 are in a closed posture, each bucket is provided. The target is a closed-type dredging grab bucket in which the joint surfaces P of the shell main body 13 included in the shell 4 are in close contact with each other and the internal space of the pair of shell main bodies 13 is sealed. The shell main body 13 is formed of a shell bottom wall 20 that scoops an object to be gripped, a shell front wall 23 and a shell rear wall 24 that are continuous in front of and behind the shell bottom wall 20, and each of these shell walls 20, 23, and 24. It has a shell upper wall 21 that closes the opening . Inside the shell body 13 surrounded by each shell wall 20, 21, 23, 24, a plurality of sealed bag-shaped adjusting bags 30 that are expanded and contracted by filling and discharging fluid are provided, and the adjusting bag 30 is expanded. by adjusting the number of, that is configured to adjust the bucket capacity size. On the outside of the adjusting bag 30, a bag-shaped bag cover 40 formed of a flexible sheet material and having an opening upward is provided.

The adjusting bag 30 includes a bag peripheral side wall 31 that surrounds the front, rear, left, and right sides made of a flexible gas-liquid permeable sheet material, and a bag upper wall 33 and a bag lower wall 32 that close the upper and lower openings of the bag peripheral side wall 31. The bag upper wall 33 is joined to the inner surface of the shell body 13 in close contact with the flat shell upper wall 21. When the adjusting bag 30 is filled with a fluid and expanded, the adjusting bag 30 is configured to have a horizontally long rectangular parallelepiped bag shape along the shell upper wall 21.

The adjusting bag 30 and the bag cover 40 are joined to the shell upper wall 21 by a fastener consisting of a square frame-shaped pressing frame 51, a bolt body 52 for fastening and fixing the pressing frame 51 to the shell upper wall 21, and a nut body 53. Has been done. The bag upper wall 33 includes a bag connecting wall 34 that protrudes outward from each side of the bag peripheral side wall 31, and the bag cover 40 is formed to be slightly larger than the bag peripheral side wall 31 of the adjustment bag 30. A cover peripheral side wall 41 that surrounds the front, rear, left and right sides, a cover bottom wall 42 that closes the lower opening of the cover peripheral side wall 41, and a cover connecting wall 43 that extends outward from the front, back, left, and right upper edges of the cover peripheral side wall 41. I have. The adjustment bag 30 and the bag cover 40 are placed on the shell upper wall 21 in a state where the bag connecting wall 34 of the adjusting bag 30 and the cover connecting wall 43 of the bag cover 40 are sandwiched between the shell upper wall 21 and the holding frame 51. It is joined to.

A filling valve 35 for filling the adjusting bag 30 with a fluid is provided on the bag upper wall 33 of the adjusting bag 30. The filling valve 35 is exposed to the outside of the shell main body 13 through an exposed window 57 provided on the shell upper wall 21.

The filling valve 35 includes a valve shaft 36 that projects upward from the bag upper wall 33 of the adjusting bag 30 and is exposed to the outside of the shell body 13 through the exposed window 57. The space between the valve shaft 36 and the exposed window 57 is hermetically sealed with a seal body 58.

A discharge valve 37 for discharging the fluid filled in the adjustment bag 30 is provided on the lower wall 32 of the adjustment bag 30. The discharge valve 37 is exposed to the outside of the bag cover 40 through an exposed hole 44 formed in the cover bottom wall 42 of the bag cover 40.

When the adjusting bag 30 is not filled with fluid, the adjusting bag 30 and the bag cover 40 are contracted in the vertical direction by folding the bag peripheral side wall 31 and the cover peripheral side wall 41. The shell body 13 is provided with a support 64 that presses and supports the contracted adjusting bag 30 and the bag cover 40 from below.

The support 64 includes a support bar 65 extending in the left-right direction and a pair of left and right guide rails 66 fixed to the shell body 13 and slidably supporting the support bar 65 in the front-rear direction. The support bar 65 can expand the adjustment bag 30 by retracting from the bag support position that supports both 30 and 40 across the lower side of the adjustment bag 30 and the bag cover 40 and the lower side of the adjustment bag 30 and the bag cover 40. It is configured so that it can be slid and displaced to the inflatable position.

In the closed-type dredging grab bucket of the present invention, the closed bag-shaped adjusting bag 30 is expanded and contracted by filling and discharging fluid inside the shell main body 13 surrounded by the shell walls 20, 21, 23, and 24. The bucket capacity was adjusted to be large or small by adjusting the number of adjusting bags 30 to be inflated. According to the dredging grab bucket having such a configuration, the internal volume when the pair of shell bodies 13 are closed is adjusted to the volume of the adjusting bag 30 by simply filling the adjusting bag 30 in the contracted state with a fluid and expanding it. Since the volume can be reduced by the amount, the bucket capacity can be reduced by expanding the adjustment bag 30 corresponding to the bucket capacity to be reduced. Further, since the volume reduction state due to the adjustment bag 30 can be released only by discharging the fluid filled in the adjustment bag 30 in the inflated state and contracting it, the original bucket capacity can be restored. As described above, according to the dredging grab bucket of the present invention, the bucket capacity can be changed to large or small by the fluid filling / discharging operation of the adjusting bag 30, so that the bucket capacity can be adjusted more easily.

The adjusting bag 30 includes a bag peripheral side wall 31 that surrounds the front, rear, left, and right sides made of a flexible gas-liquid permeable sheet material, and a bag upper wall 33 and a bag lower wall 32 that close the upper and lower openings of the bag peripheral side wall 31. When the bag upper wall 33 is joined to the inner surface of the shell main body 13 in a state of being in close contact with the flat plate-shaped shell upper wall 21, a gripping object or the like is formed between the adjusting bag 30 and the flat shell upper wall 21. Can be prevented from accumulating, so that the adjustment bag 30 can be prevented from being damaged by the weight of the accumulated grip or the like. Further, when the adjusting bag 30 is filled with fluid and expanded, if the adjusting bag 30 is configured to have a horizontally long rectangular parallelepiped bag shape along the shell upper wall 21, the adjusting bag 30 is located closer to the upper side inside the shell body 13. When the gripping object is grasped by the pair of bucket shells 4, it is possible to avoid contact between the gripping object deposited on the lower side inside the shell body 13 and the adjustment bag 30 as much as possible. it can. Therefore, it is possible to prevent the adjustment bag 30 from being crushed by the gripping object and the internal pressure of the bag 30 from rising abnormally, thereby preventing the filled fluid from leaking and the adjustment bag 30 from bursting. it can.

If a bag-shaped bag cover 40 formed of a flexible sheet material and having an upper opening is provided on the outside of the adjusting bag 30, the adjusting bag 30 can be protected by the bag cover 40, so that the gripping target can be adjusted. Damage caused by direct contact with the bag 30 can be prevented.

The adjusting bag 30 and the bag cover 40 are attached to the shell upper wall 21 by a square frame-shaped pressing frame 51 and a fastener composed of a bolt body 52 and a nut body 53 for fastening and fixing the pressing frame 51 to the shell upper wall 21. The bag upper wall 33 is joined, and the bag upper wall 33 is provided with a bag connecting wall 34 that protrudes outward from each side of the bag peripheral side wall 31, and the bag cover 40 is formed to be slightly larger than the bag peripheral side wall 31 of the adjustment bag 30. The cover peripheral side wall 41 that surrounds the front, rear, left and right sides, the cover bottom wall 42 that closes the lower opening of the cover peripheral side wall 41, and the cover connecting wall 43 that extends outward from the front, back, left, and right upper edges of the cover peripheral side wall 41, respectively. The adjusting bag 30 and the bag cover are sandwiched between the shell upper wall 21 and the holding frame 51 with the bag connecting wall 34 of the adjusting bag 30 and the cover connecting wall 43 of the bag cover 40. 40 was joined to the shell upper wall 21. According to the dredging grab bucket having such a configuration, the adjusting bag 30 and the bag cover 40 can be joined to the shell upper wall 21 with one joining structure, so that the adjusting bag 30 and the bag cover 40 have an individual joining structure. Compared with the form joined to the shell upper wall 21, it is possible to simplify the attachment / detachment operation at the time of assembling and maintaining both 30 and 40.

A filling valve 35 for filling the adjusting bag 30 with a fluid is provided on the bag upper wall 33 of the adjusting bag 30, and the filling valve 35 passes through an exposed window 57 provided on the shell upper wall 21 and is used as a shell body 13. If it is exposed to the outside of the shell body 13, the fluid can be filled from the outside of the shell body 13, so that it is not necessary to sneak into the shell body 13 and perform the filling operation, so that the bucket capacity can be more easily maintained while ensuring safety. Adjustment work can be performed.

The filling valve 35 includes a valve shaft 36 that projects upward from the bag upper wall 33 of the adjustment bag 30 and is exposed to the outside of the shell body 13 via the exposed window 57, and the valve shaft 36 and the exposed window 57 When the space is hermetically sealed with the seal body 58, the seal body 58 prevents the gripping object soaring into the water from entering between the shell upper wall 21 and the bag upper wall 33 through the exposed window 57. Therefore, it is possible to prevent the gripping object from accumulating between the shell upper wall 21 and the bag upper wall 33.

A discharge valve 37 for discharging the fluid filled in the adjustment bag 30 is provided on the opposite wall of the bag lower wall 32 of the adjustment bag 30, in other words, the bag upper wall 33 provided with the filling valve 35, and the discharge valve 37. However, when the bag cover 40 is exposed to the outside of the bag cover 40 through the exposed holes 44 formed in the cover bottom wall 42 of the bag cover 40, for example, when the fluid is water (seawater), the bucket shell 4 is attached to the bag lower wall 32. The fluid filled in the adjusting bag 30 can be easily discharged by the action of gravity only by opening the discharge valve 37 in the state where the bag 30 is located downward. At this time, since air is introduced from the filling valve 35, it is possible to prevent the inside of the adjusting bag 30 from being depressurized and to quickly discharge water.

When the adjustment bag 30 is not filled with fluid, the adjustment bag 30 and the bag cover 40 are retracted in the vertical direction when the bag peripheral side wall 31 and the cover peripheral side wall 41 are folded and contracted in the vertical direction. Since the thickness dimension in the vertical direction can be reduced, it is possible to prevent both 30 and 40 from coming into contact with the gripping object deposited on the lower side inside the shell body 13 as much as possible. Further, when the shell body 13 is provided with the support 64 that presses and supports the contracted adjustment bag 30 and the bag cover 40 from below, the support 64 can prevent the folded portion from being unintentionally extended. Therefore, both 30 and 40 foldable shapes can be maintained.

The support 64 includes a support bar 65 extending in the left-right direction and a pair of left and right guide rails 66 fixed to the shell body 13 and slidably supporting the support bar 65 in the front-rear direction. The support bar 65 includes an adjustment bag 30. And slide to the bag support position that supports both 30 and 40 across the lower side of the bag cover 40 to the left and right, and the inflatable position that retracts from the lower side of the adjustment bag 30 and the bag cover 40 and allows the adjustment bag 30 to expand. When the adjustment bag 30 is not used, the support bar 65 is slid to the bag support position to support the contracted adjustment bag 30 and the bag cover 40 by pressing and supporting the adjusted bag 30 and the bag cover 40 so as to be movable. When it is desired to inflate the bag 30, the support bar 65 can be slid to an inflatable position to release the presser support. Therefore, the presser foot support of the adjustment bag 30 and its release can be performed by a simple operation of simply sliding the support bar 65.

It is a vertical sectional front view which shows the main part of the grab bucket for dredging which concerns on this invention. It is a front view of the grab bucket for dredging. It is a side view of the grab bucket for dredging. It is a longitudinal front view of the grab bucket for dredging. FIG. 1 is a cross-sectional view taken along the line AA in FIG. 1, and is a plan view of a bucket shell. It is a perspective view which shows the adjustment bag and a bag cover. FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 1 is a cross-sectional view taken along the line CC in FIG. 1, where FIG. 1A shows a state in which the adjustment bag is contracted, and FIG. 1B shows a state in which the adjustment bag is inflated.

(Examples) FIGS. 1 to 8 show examples of a dredging grab bucket (hereinafter, simply referred to as a grab bucket) according to the present invention. The front / rear, left / right, and up / down in the present invention follow the crossing arrows shown in FIGS. 2 and 3 and the front / rear, left / right, and up / down indications shown in the vicinity of each arrow. In FIG. 2, the grab bucket includes an upper frame 1 and a lower frame 2 arranged one above the other, a pair of left and right bucket shells 4 that are openably and closably supported by a shell shaft 3 provided on the lower frame 2, and an upper frame 1. It is composed of a pair of left and right rods 5 that connect the left and right bucket shells 4.

The upper frame 1 is suspended by a pair of elevating ropes 7, and the lower frame 2 is suspended by a pair of opening and closing ropes 8. The elevating rope 7 and the opening / closing rope 8 are connected to a winch for raising / lowering the bucket and a winch for opening / closing the shell via a boom of a crane vessel (not shown), respectively. The opening / closing rope 8 is wound around an upper sheave group 9 provided on the upper frame 1 and a lower sheave group 10 provided on the lower frame 2, and the opening / closing rope 8, the upper sheave group 9 and the lower sheave group 10 are used together. It constitutes a moving pulley. When the opening / closing rope 8 is extended from the winch for opening / closing the shell, the upper and lower sheave groups 9 and 10 are separated from each other to increase the relative distance between the upper and lower frames 1 and 2, and the pair of bucket shells 4 are operated in the opening direction. Will be done. Further, when the opening / closing rope 8 is wound up by the winch for opening / closing the shell, the upper and lower sheave groups 9 and 10 are close to each other, the relative distance between the upper and lower frames 1 and 2 is reduced, and the pair of bucket shells 4 are closed. Is operated by. As shown in FIG. 3, in this embodiment, two upper sheave groups 9 and two lower sheave groups 10 are provided, and two sets of moving pulleys constitute an opening / closing structure of the bucket shell 4.

As shown in FIGS. 3 and 4, each bucket shell 4 has a shell main body 13 having a vertical cross section formed in a horizontal container shape, four opening / closing arms 14 fixed to the upper surface of the shell main body 13, and an outer surface. It is composed of four rod brackets 15 and the like fixed to. In the opening / closing arm 14, the upper portions of the opening / closing arm 14 provided in each bucket shell 4 are rotatably connected to the lower frame 2 by the shell shaft 3 at the tip. The upper end of each rod 5 is connected to the upper frame 1 by the upper connecting pin 16, and the lower end of each rod 5 is connected to the rod bracket 15 by the lower connecting pin 17. The grab bucket is configured as a wide grab bucket in which the inner dimension of the shell main body 13 in the front-rear direction is set to be larger than the inner dimension facing the inner direction in the left-right direction when both bucket shells 4 are closed.

As shown in FIG. 4, when the pair of bucket shells 4 are in the closed posture, the shell main body 13 is joined to the shell bottom wall 20 having an outer protruding arc-shaped cross section that inclines downward toward the joint surface P of the bucket shell 4. A flat shell upper wall 21 that inclines upward toward the surface P, a shell corner wall 22 having a dogleg-shaped cross section that connects the upper end of the shell bottom wall 20 and the lower end of the shell upper wall 21, and each of these shell walls. It is composed of a shell front wall 23 having a continuous front edge of 20/21/22 and a shell rear wall 24 having a continuous trailing edge. Inside the shell body 13, four reinforcing shell frames 25 are provided in the front-rear direction. The arrangement position of the shell frame 25 in the front-rear direction coincides with the arrangement position of the opening / closing arm 14. The shell bottom wall 20, the shell upper wall 21, the shell front wall 23, and the edges of the shell rear wall 24 form a joint surface P of the shell body 13, and at the edges of each of these shell walls 20, 21, 23, and 24. The formed opening surface constitutes a gripping port for mud (grabbing target).

In the grab bucket, when the pair of bucket shells 4 are in the closed posture, the joint surfaces P of the shell main bodies 13 included in each bucket shell 4 are in close contact with each other, and the internal space of the pair of shell main bodies 13 is sealed. In this way, the grab bucket is configured as a closed type grab bucket that can seal the grip opening to prevent the leakage of mud. In the present invention, the fact that the gripping port can be sealed does not mean that the gripping port can be strictly sealed in an airtight or watertight manner, and the mud taken into the bucket shell 4 is joined during transportation. It means the degree of airtightness that can regulate the outflow from the surface P. A claw for scraping off accumulated silt or earth and sand, or excavating the seabed or the like may be fixed to the outer surface of the lower end of the shell bottom wall 20.

The shell bottom wall 20 and the shell corner wall 22 are adjacent to each other in order to allow air and water in the shell body 13 to escape to the outside when the grab bucket in the open posture of the pair of bucket shells 4 is lowered toward the seabed. Vents 26 are provided at three locations in front of and behind the upper corner. A lid 27 is arranged on the inner surface of the vent 26, and the lid 27 is swingably supported by a pin 28 provided at the upper end thereof. When the pair of bucket shells 4 are in the open posture, they are held in the vertical posture by the moment due to their own weight and the vent 26 is opened. Therefore, when the pair of bucket shells 4 are in the open posture and lowered in water, the shell body The air and water in the 13 can escape from each vent 26 to the outside to reduce the resistance of the water during descent, and the descent speed of the grab bucket can be increased. Further, in the posture in which the pair of bucket shells 4 are closed and the mud is scooped up (see FIG. 4), the lid 27 adheres to the inner surface of the shell bottom wall 20 by the moment due to its own weight and closes the vent 26, so that the mud is removed. It is possible to prevent leakage from the vent 26 to the outside of the shell body 13.

In the grab bucket of this embodiment, in order to change the bucket capacity defined by the internal volume when the pair of shell main bodies 13 is closed to a large or small size, the inside of the shell main bodies 13 is filled with a fluid as shown in FIG. A closed bag-shaped adjusting bag 30 that is expanded and contracted by discharging is provided. Four adjustment bags 30 are provided in each shell body 13 (see FIG. 3), and the internal volume of the shell body 13 is reduced by the total volume of the inflated adjustment bag 30 to increase or decrease the bucket capacity. Can be adjusted. Each of the adjusting bags 30 is formed in the same shape and has the same volume when expanded, and is arranged side by side in the front-rear direction inside the shell main body 13. The adjusting bag 30 is made of a flexible gas-liquid permeable sheet material, and as shown in FIG. 6, the bag peripheral side wall 31 that surrounds the front, rear, left and right sides, and the bag lower wall 32 that closes the lower opening of the bag peripheral side wall 31. And a bag upper wall 33 that closes the upper opening, and when the adjustment bag 30 is filled with fluid and inflated, the adjustment bag 30 is configured to exhibit a rectangular parallelepiped shape along the shell upper wall 21. There is. The bag upper wall 33 is provided with a bag connecting wall 34 that is continuous with the wall 33 and projects outward from each side of the bag peripheral side wall 31. The bag upper wall 33 of this embodiment has a double structure as shown in FIG.

The bag upper wall 33 is provided with a pair of left and right filling valves 35 for filling the adjusting bag 30 with fluid. The filling valve 35 includes a valve shaft 36 that projects upward from the bag upper wall 33, and has a built-in check valve that prevents fluid from flowing back from the inside of the adjusting bag 30. The adjusting bag 30 can be filled with the fluid by connecting a supply hose for supplying the fluid to the valve shaft 36 (see the alternate long and short dash line in FIG. 8) and feeding the pressurized fluid toward the filling valve 35. Examples of the fluid to be filled include air or water (seawater). The adjustment bag 30 is made of a sheet material in which a base cloth made of polyester is coated with vinyl chloride, and is formed to have a strength that is not damaged by the weight of water even when filled with water. There is. A discharge valve 37 is provided on the lower wall 32 of the bag near the gripping port, and by opening the discharge valve 37, the fluid filled in the adjusting bag 30 can be discharged. Further, by closing the discharge valve 37, the adjusting bag 30 can be filled with the fluid.

As shown in FIG. 1, a bag-shaped bag cover 40 having an opening upward is provided on the outside of the adjusting bag 30. The bag cover 40 is made of a flexible sheet material, and as shown in FIG. 6, the cover peripheral side wall 41 surrounding the front, rear, left and right sides, which is formed slightly larger than the bag peripheral side wall 31 of the adjustment bag 30, and the cover peripheral side wall 41 A cover bottom wall 42 that closes the lower opening and a cover connecting wall 43 that extends outward from the front, rear, left, and right upper edges of the cover peripheral side wall 41 are provided. The bag cover 40 is made of a sheet material made of a polyester filament woven fabric. An exposed hole 44 is formed in the bottom wall 42 of the cover at a position corresponding to the discharge valve 37, and the discharge valve 37 is exposed to the outside of the bag cover 40 through the exposed hole 44.

As shown in FIG. 6, in the adjustment bag 30, eight bag insertion holes 47 are provided side by side in the front and rear bag connecting walls 34, respectively, and five bag insertion holes 47 are respectively provided in the left and right bag connecting walls 34. The holes 47 are opened side by side in the front-rear direction. Further, in the bag cover 40, eight cover insertion holes 48 are provided side by side in each of the front and rear cover connecting walls 43 in the left-right direction, and five cover insertion holes 48 are provided in the front and rear cover connecting walls 43, respectively. They are opened side by side in the direction. The bag insertion hole 47 and the cover insertion hole 48 are arranged so that when the bag connection wall 34 and the cover connection wall 43 are overlapped with each other, one through hole is formed by both the insertion holes 47 and 48. The adjusting bag 30 and the bag cover 40 use both insertion holes 47 and 48 to fasten and fix a square frame-shaped pressing frame 51 and the pressing frame 51 to the shell upper wall 21 (bolt body). It is joined to the shell upper wall 21 with a fastener composed of 52 and a hexagon nut (nut body) 53.

Specifically, the holding frame 51 is a square frame body corresponding to the shapes of both connecting walls 34 and 43, and eight frame insertion holes 54 are provided side by side in the left-right direction in each of the front and rear frame portions. , Five frame insertion holes 54 are provided side by side in the front-rear direction in each of the left and right frame portions. The bolt shaft 52 is projected from the inner surface of the shell upper wall 21 corresponding to both insertion holes 47 and 48 at the mounting position of the adjustment bag 30. To join the adjusting bag 30 and the bag cover 40 to the shell upper wall 21, first, the bag cover 40 is put on the outside of the adjusting bag 30, and the connecting walls 34 and 43 are overlapped with each other. Next, the bolt shaft 52 is inserted into both the insertion holes 47 and 48 of the adjustment bag 30 and the bag cover 40, and the frame insertion hole 54 of the holding frame 51 is inserted into the bolt shaft 52 from below, and then protrudes from the holding frame 51. The adjusting bag 30 and the bag cover 40 are joined to the shell upper wall 21 by screwing and tightening the hexagon nut 53 into the bolt shaft 52. In a state where the adjusting bag 30 and the bag cover 40 are joined to the shell upper wall 21, the bag upper wall 33 is in close contact with the flat shell upper wall 21 and between the shell upper wall 21 and the holding frame 51. , The bag connecting wall 34 and the cover connecting wall 43 are sandwiched.

When the adjusting bag 30 is joined to the shell upper wall 21, a circular exposure is made on the shell upper wall 21 corresponding to the filling valve 35 so that the filling valve 35 provided on the bag upper wall 33 is exposed to the outside of the shell body 13. A window 57 has been opened (see FIG. 7). The valve shaft 36 of the filling valve 35 is exposed to the outside of the shell body 13 through the exposed window 57. In the adjustment bag 30, the bag connecting walls 34 on the upper four peripheral edges are brought into close contact with the shell upper wall 21 by the holding frame 51, but there is a possibility that a gap may be formed between the shell upper wall 21 and the bag upper wall 33. Therefore, in order to prevent mud and the like floating in the water from entering the gap from the exposed window 57, the valve shaft 36 and the exposed window 57 are watertightly sealed with a seal body 58. The seal body 58 is formed in a circular ring shape having an inner diameter smaller than the diameter dimension of the valve shaft 36, and is fixed to the shell upper wall 21 by a pressing ring 59 and four hexagon bolts 60. The hexagon bolt 60 is screwed into the seal seat 61 integrally formed with the shell upper wall 21, and the seal body 58 is sandwiched and fixed between the pressing ring 59 and the seal seat 61.

When the bucket capacity is not adjusted, that is, when the adjusting bag 30 is not filled with fluid and is contracted, the adjusting bag 30 and the bag cover 40 are brought into close contact with the shell upper wall 21 in the folded state. It is held. Specifically, as shown in FIG. 8, the adjusting bag 30 and the bag cover 40 are provided on the shell main body 13 in which the bag peripheral side wall 31 and the cover peripheral side wall 41 are folded inward and contracted in the vertical direction. It is supported by a support body 64 from below. The support body 64 includes a pair of front and rear support bars 65 extending in the left-right direction and a pair of left and right guide rails 66 fixed to the shell upper wall 21 (shell body 13) and slidably supporting each support bar 65 in the front-rear direction. I have. Each guide rail 66 is made of a strip having an L-shaped cross section extending in the front-rear direction, and is provided between adjacent shell frames 25. Each support bar 65 is composed of a hollow round pipe, and the bag support position of FIG. 8A, which supports both 30 and 40 across the lower side of the adjustment bag 30 and the bag cover 40, and the adjustment bag 30 and the bag cover. The adjustment bag 30 can be slid and displaced from the lower side of the 40 to the inflatable position shown in FIG. 8 (b). Restriction brackets 67 are fixed to the left and right ends of each support bar 65, and a regulation bolt 69 made of a hexagon bolt is screwed into a screw hole 68 formed in the guide rail 66 through a through hole formed in the regulation bracket 67. Therefore, the movement of the support bar 65 is restricted. The screw hole 68 is composed of a first screw hole 68a for holding the support bar 65 in the bag support position and a second screw hole 68b for holding the support bar 65 in the expandable position.

Here, the operation for reducing the bucket capacity will be described. First, the opening / closing rope 8 is extended while the grab bucket is stopped in the air, the pair of bucket shells 4 are in a half-open posture, and the elevating rope 7 is extended in that posture so that the tips of the bottom walls 20 of both shells are on the pontoon. Place the grab bucket so that it touches the ground. At this time, it is easier to perform the work later when the inclination of the shell upper wall 21 is not large. Next, the regulation bolt 69 holding the support bar 65 of the adjustment bag 30 used for capacity adjustment is loosened and removed, the support bar 65 is moved to the expandable position, and then the regulation bolt 69 penetrates the regulation bracket 67. It is screwed into the second screw hole 68b through the hole to hold the support bar 65 in the expandable position. When the movement of the support bar 65 of the target portion is completed, the adjustment bag 30 to be inflated here is filled with water (fluid) via the filling valve. Specifically, a supply hose for supplying water is connected to the valve shaft 36, and water pressurized by a pump or the like is supplied toward the filling valve 35 to fill the adjustment bag 30 to be inflated. At this time, the folded bag peripheral side wall 31 and the cover peripheral side wall 41 naturally expand. When all of the adjustment bags 30 to be inflated are filled with water, the work of reducing the bucket capacity is completed.

When the bucket capacity is restored, the grab bucket is placed on the pontoon in the same posture as when the bucket capacity is reduced, and the discharge valve 37 is opened. When the pair of bucket shells 4 are in the half-open posture, the lower wall 32 of the bag is located below the upper wall 33 of the bag, so that the water filled by the action of gravity is naturally discharged to the outside of the adjusting bag 30. At this time, air enters the adjusting bag 30 from the filling valve 35. Since the discharge valve 37 is provided near the grip opening of the lower wall 32 of the bag, the discharge valve 37 is located at the lower end portion of the adjustment bag 30 when the pair of bucket shells 4 are in the half-open posture. Therefore, most of the filled water is discharged to the outside of the adjusting bag 30 only by opening the discharge valve 37. When the drainage of the filled water is completed, the bag peripheral side wall 31 and the cover peripheral side wall 41 are folded and contracted, and the support bar 65 is held at the bag support position in the reverse procedure to increase the bucket capacity. The work of returning to the original is completed.

When adjusting the bucket capacity to a large or small size, basically, the adjusting bag 30 to be expanded is adjusted so as to be symmetrical in the front-rear direction and the left-right direction. This is because, when the position of the inflated adjustment bag 30 is not symmetrical, when the grab bucket is lifted from the water, the position of the center of gravity of the grab bucket shifts from directly below the elevating rope 7 due to the weight of the filled water. This is because the posture of the lifted grab bucket becomes unstable. The fluid to be filled in the adjustment bag 30 may be air. However, when the adjusting bag 30 is filled with air, when the grab bucket is in water, buoyancy is generated and a load is applied to the adjusting bag 30, so that the fluid to be filled is preferably water.

As described above, in the grab bucket according to the present embodiment, a plurality of sealed bag-shaped adjusting bags 30 that are expanded and contracted by filling and discharging the fluid are provided inside the shell body 13 to expand the adjusting bag 30. Since the number of buckets is adjusted to adjust the bucket capacity to a large or small size, the internal volume when the pair of shell bodies 13 are closed can be obtained simply by filling the contracted adjustment bag 30 with a fluid and expanding it. The volume can be reduced by the volume of the adjusting bag 30, and the bucket capacity can be reduced by expanding the adjusting bag 30 corresponding to the bucket capacity to be reduced. Further, since the volume reduction state due to the adjustment bag 30 can be released only by discharging the fluid filled in the adjustment bag 30 in the inflated state and contracting it, the original bucket capacity can be restored. As described above, according to the grab bucket of the present embodiment, the bucket capacity can be changed to large or small by the fluid filling / discharging operation of the adjusting bag 30, so that the bucket capacity can be adjusted more easily.

The adjusting bag 30 includes a bag peripheral side wall 31 that surrounds the front, rear, left, and right sides made of a flexible gas-liquid permeable sheet material, and a bag upper wall 33 and a bag lower wall 32 that close the upper and lower openings of the bag peripheral side wall 31. Since the bag upper wall 33 was joined to the inner surface of the shell upper wall 21 in a state of being in close contact with the flat shell upper wall 21, a gripping object or the like was formed between the adjusting bag 30 and the flat shell upper wall 21. Can be prevented from accumulating, and the adjusting bag 30 can be prevented from being damaged by the weight of the accumulated grip or the like. Further, when the adjusting bag 30 is filled with fluid and expanded, the adjusting bag 30 is configured to have a horizontally long rectangular parallelepiped bag shape along the upper wall 21 of the shell, so that the adjusting bag is located closer to the upper side inside the shell body 13. 30 can be arranged, and when the gripping object is grasped by the pair of bucket shells 4, it is possible to avoid contact between the gripping object deposited on the lower side inside the shell body 13 and the adjustment bag 30 as much as possible. it can. Therefore, it is possible to prevent the adjustment bag 30 from being crushed by the gripping object and the internal pressure of the bag 30 from rising abnormally, thereby preventing the filled fluid from leaking and the adjustment bag 30 from bursting. it can.

Since the bag-shaped bag cover 40 formed of a flexible sheet material and having an opening upward is provided on the outside of the adjustment bag 30, the adjustment bag 30 can be protected by the bag cover 40, so that the object to be grasped is the adjustment bag 30. It is possible to prevent damage due to direct contact with the bag.

The adjusting bag 30 and the bag cover 40 are attached to the shell upper wall 21 by a square frame-shaped pressing frame 51 and a fastener composed of a bolt shaft 52 and a hexagon nut 53 for fastening and fixing the pressing frame 51 to the shell upper wall 21. The adjusting bag 30 and the bag cover 40 are shelled in a state where the bag connecting wall 34 of the adjusting bag 30 and the cover connecting wall 43 of the bag cover 40 are sandwiched between the shell upper wall 21 and the holding frame 51. Since it is joined to the upper wall 21, the adjusting bag 30 and the bag cover 40 can be joined to the shell upper wall 21 with one joining structure, and the adjusting bag 30 and the bag cover 40 are joined to the shell upper wall with individual joining structures. Compared with the form joined to 21, the attachment / detachment operation at the time of assembling and maintaining both 30 and 40 can be simplified.

A filling valve 35 for filling the adjusting bag 30 with a fluid is provided on the bag upper wall 33 of the adjusting bag 30, and the filling valve 35 is provided outside the shell main body 13 via an exposed window 57 provided on the shell upper wall 21. Since it is exposed, the fluid can be filled from the outside of the shell body 13, so there is no need to sneak into the shell body 13 and perform the filling operation, so the bucket capacity can be adjusted more easily while ensuring safety. Can be done.

The filling valve 35 includes a valve shaft 36 that protrudes upward from the bag upper wall 33 of the adjustment bag 30 and is exposed to the outside of the shell body 13 via the exposed window 57, and is between the valve shaft 36 and the exposed window 57. Since the seal body 58 seals the bag in a watertight manner, the seal body 58 can prevent the gripping object that has soared into the water from entering between the shell upper wall 21 and the bag upper wall 33 through the exposed window 57. It is possible to prevent the gripping object from accumulating between the shell upper wall 21 and the bag upper wall 33.

A discharge valve 37 for discharging the fluid filled in the adjustment bag 30 is provided on the opposite wall of the bag lower wall 32 of the adjustment bag 30, in other words, the bag upper wall 33 provided with the filling valve 35, and the discharge valve 37 is used as a bag. Since the bag cover 40 is exposed to the outside through the exposed hole 44 formed in the cover bottom wall 42 of the cover 40, the bucket shell 4 is located below the bag lower wall 32 when the fluid is water (seawater). By simply opening the discharge valve 37 in the posture, the fluid filled in the adjusting bag 30 can be easily discharged by the action of gravity. At this time, since air is introduced from the filling valve 35, it is possible to prevent the inside of the adjusting bag 30 from being depressurized and to quickly discharge water.

When the adjusting bag 30 was not filled with fluid, the adjusting bag 30 and the bag cover 40 were retracted in the vertical direction by folding the bag peripheral side wall 31 and the cover peripheral side wall 41, so that the adjusting bag 30 and the bag cover 40 were retracted in the vertical direction. The thickness dimension of the two can be reduced, and both 30 and 40 can be prevented from coming into contact with the gripping object deposited on the lower side inside the shell body 13 as much as possible. Further, since the shell body 13 is provided with the support 64 that presses and supports the contracted adjustment bag 30 and the bag cover 40 from below, the support 64 can prevent the folded portion from being unintentionally extended, and both of them. It can retain the folded shape of 30 and 40.

The support body 64 includes a support bar 65 extending in the left-right direction and a pair of left and right guide rails 66 fixed to the shell body 13 and slidably supporting the support bar 65 in the front-rear direction. The support bar 65 is an adjustment bag. A bag support position that supports both 30 and 40 across the lower side of the 30 and the bag cover 40 to the left and right, and an inflatable position that retracts from the lower side of the adjustment bag 30 and the bag cover 40 and allows the adjustment bag 30 to expand. Since the adjustment bag 30 is configured to be slidable, when the adjustment bag 30 is not used, the support bar 65 is slid to the bag support position to support the contracted adjustment bag 30 and the bag cover 40 from below, and the adjustment bag is also supported. When it is desired to inflate 30, the support bar 65 can be slid to an inflatable position to release the presser support. Therefore, the presser foot support of the adjustment bag 30 and its release can be performed by a simple operation of simply sliding the support bar 65.

In the above embodiment, the plurality of adjusting bags 30 are formed in the same shape, but the adjusting bags 30 can be formed in two or more different shapes and provided with different volumes. The bag upper wall 33 does not have to have a double structure. The nut body 53 may be formed of screw holes formed in the shell upper wall 21, the bolt body 52 may be formed of hexagon bolts, and the holding frame 51 may be fastened and fixed to the shell upper wall 21.

2 Lower frame 3 Shell axis 4 Bucket shell 13 Shell body 20 Shell bottom wall 21 Shell upper wall 23 Shell front wall 24 Shell rear wall 30 Adjustment bag 31 Bag peripheral wall 32 Bag lower wall 33 Bag upper wall 34 Bag connecting wall 35 Filling valve 36 Valve shaft 37 Discharge valve 40 Bag cover 41 Cover peripheral side wall 42 Cover bottom wall 43 Cover connecting wall 44 Exposed hole 51 Pressing frame 52 Bolt body (bolt shaft)
53 Nut body (hexagon nut)
57 Exposed window 58 Seal body 64 Support 65 Support bar 66 Guide rail P Joint surface

Claims (8)

Each bucket shell (4) is provided with a pair of left and right bucket shells (4) that can be opened and closed by a shell shaft (3) provided on the lower frame (2), and when the pair of bucket shells (4) are in the closed posture. It is a closed type dredging grab bucket in which the joint surfaces (P) of the shell main body (13) provided in 4) are in close contact with each other and the internal space of the pair of shell main bodies (13) is sealed.
The shell body (13) includes a shell bottom wall (20) that scoops the object to be grasped, a shell front wall (23) and a shell rear wall (24) that are continuous in front of and behind the shell bottom wall (20), and each of these shell walls. It has a shell upper wall (21) that closes the upper opening formed by (20, 23, 24).
Inside the shell body (13) surrounded by each shell wall (20, 21, 23, 24), a plurality of hermetically sealed bag-shaped adjustment bags (30) that are expanded and contracted by filling and discharging fluid are provided. The number of adjusting bags (30) to be inflated is adjusted to adjust the bucket capacity to a large or small size .
A dredging grab bucket characterized in that a bag-shaped bag cover (40) formed of a flexible sheet material and having an upper opening is provided on the outside of the adjusting bag (30) . The adjustment bag (30) includes a bag peripheral side wall (31) that surrounds the front, rear, left and right sides made of a flexible gas-liquid permeable sheet material, and a bag upper wall (31) that closes the upper and lower openings of the bag peripheral side wall (31). 33) and the lower wall of the bag (32), including
The upper wall (33) of the bag is joined to the inner surface of the shell body (13) in close contact with the upper wall (21) of the flat shell.
The dredging according to claim 1, wherein when the adjusting bag (30) is filled with a fluid and expanded, the adjusting bag (30) is configured to exhibit a horizontally long rectangular parallelepiped bag shape along the shell upper wall (21). For grab bucket. The adjusting bag (30) and the bag cover (40) are a square frame-shaped pressing frame (51), and a bolt body (52) and a nut body that fasten and fix the pressing frame (51) to the shell upper wall (21). It is joined to the shell upper wall (21) with a fastener made of (53).
The bag upper wall (33) includes a bag connecting wall (34) that protrudes outward from each side of the bag peripheral side wall (31).
The bag cover (40) closes the cover peripheral side wall (41) that surrounds the front, rear, left, and right sides, which is formed slightly larger than the bag peripheral side wall (31) of the adjustment bag (30), and the lower opening of the cover peripheral side wall (41). It is provided with a cover bottom wall (42) and a cover connecting wall (43) extending outward from the front, rear, left, and right upper edges of the cover peripheral side wall (41).
The bag connecting wall (34) of the adjusting bag (30) and the cover connecting wall (43) of the bag cover (40) are sandwiched between the shell upper wall (21) and the holding frame (51). The dredging grab bucket according to claim 1 or 2, wherein the adjusting bag (30) and the bag cover (40) are joined to the shell upper wall (21) . A filling valve (35) for filling the adjusting bag (30) with fluid is provided on the bag upper wall (33) of the adjusting bag (30).
The dredging according to any one of claims 1 to 3, wherein the filling valve (35) is exposed to the outside of the shell body (13) through an exposed window (57) provided on the shell upper wall (21). For grab bucket. The filling valve (35) includes a valve shaft (36) that projects upward from the bag upper wall (33) of the adjusting bag (30) and is exposed to the outside of the shell body (13) through the exposed window (57). And
Dredging glove bucket according to claim 4, between the valve shaft (36) and exposing window (57) is sealed in a watertight form in the seal body (58). A discharge valve (37) for discharging the fluid filled in the adjustment bag (30) is provided on the lower wall (32) of the adjustment bag (30).
The fourth or fifth aspect of the present invention, wherein the discharge valve (37) is exposed to the outside of the bag cover (40) through an exposed hole (44) provided in the cover bottom wall (42) of the bag cover (40). Grab bucket for dredging. When the adjusting bag (30) is not filled with fluid, the adjusting bag (30) and the bag cover (40) are retracted in the vertical direction with the bag peripheral side wall (31) and the cover peripheral side wall (41) folded. Cover,
The invention according to any one of claims 1 to 6, wherein the shell body (13) is provided with a retractable adjustment bag (30) and a support (64) that presses and supports the bag cover (40) from below . Grab bucket for dredging. The support body (64) includes a support bar (65) extending in the left-right direction and a pair of left and right guide rails (66) fixed to the shell body (13) to slidably support the support bar (65) in the front-rear direction. Including
The support bar (65) is a bag support position that supports both (30.40) across the underside of the adjustment bag (30) and the bag cover (40), and the adjustment bag (30) and the bag cover (40). The dredging grab bucket according to claim 7, which is configured so that it can be slid and displaced to an inflatable position where the adjusting bag (30) can be retracted from the lower side and expanded .

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