JP2010255323A - Grab bucket for dredging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grab bucket which can surely prevent mud from leaking from a drip hole, by firmly closing the drip hole with an opening/closing body and can quickly discharge the internal pressure of a shell when the internal pressure increases. <P>SOLUTION: A triangular drip hole 15 is opened in the upper wall 5a of the bucket shell 5. The opening/closing body 17 which opens and closes the drip hole 15 from the outer surface side is fixed along one side of the drip hole 15 and supported so as to be swingably opened and closed around the fixed end side. The opening/closing body 17 comprises a rubber lid 18 which is stuck to the opened peripheral edge wall of the drip hole 15 in a closed state, and a regulating body 23 which inhibits the rubber lid 18 from falling into the drip hole 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a grab bucket for dredging used when dredging or excavating silt and sediment deposited on the seabed or the like.

  Regarding this type of grab bucket, the present applicants have previously filed Patent Document 1. There, a drainage opening is formed in the upper wall of the pair of left and right bucket shells, and an opening / closing body for opening and closing the drainage opening is provided. The opening / closing body is disposed on the inner surface side of the drainage port, and can open / close the drainage port in conjunction with opening / closing of the bucket shell. In a state where the bucket shell is closed, the drainage port can be closed with an opening / closing body to prevent the mud in the shell from flowing out of the drainage port.

  In the present invention, the opening / closing body is arranged on the outer surface side of the bucket shell, and the opening / closing body is mainly composed of a rubber lid that can be elastically deformed. These points are known in Patent Document 2. There, an open / close body is composed of a rectangular rubber lid and a U-shaped frame fixed to the inside and outside of the three sides of the rubber lid, and the remaining side of the rubber lid is fastened and fixed to the peripheral edge of the drain port. ing.

Registered Utility Model No. 3046423 (paragraph number 0023, FIG. 1) Japanese Patent No. 3884008 (paragraph number 0013, FIGS. 3 and 4)

  In Patent Document 2, a U-shaped frame is fixed to three sides around the rubber lid, and the rubber lid and the frame swing together. In other words, in the closed state of the rubber lid, the U-shaped frame on the inner surface side of the rubber lid abuts the receiving frame, but since the receiving frame and the frame are both made of metal, the sealing performance is low, and therefore the mud is sure to flow out. Cannot be prevented. The rubber lid functions only as a partition wall that partitions the inner and outer surfaces of the bucket shell.

  Further, since the four sides of the rubber lid are retained by the U-shaped frame and the belt-like frame, the rubber lid can be elastically deformed only at the adjacent gap portion between both frames. As described above, when the deformable portion of the rubber lid is limited to a narrow portion, the load concentrates and is easily fatigued and deteriorated.

  Furthermore, since the U-shaped frame is attached to the inner and outer surfaces of the rubber lid, the overall weight of the opening / closing body is large. The rubber lid can be elastically deformed only at the rocking base end. For this reason, the opening / closing operation is slow, and it is difficult to be in an open state, particularly after it is once closed. Therefore, when the shell scoops mud soil having a predetermined capacity or more and the internal pressure of the shell increases, the internal pressure cannot be quickly released out of the shell.

  In addition, in the bucket shell of Patent Document 2, a drain pipe that protrudes upward is formed with respect to the inclined shell upper wall, and an opening / closing body is attached to the tip of the drain pipe. Providing such a water drain tube complicates the shape of the shell and increases manufacturing costs.

  The object of the present invention is to securely close the drainage port with an opening / closing body to surely prevent the mud from leaking from the drainage port, and when the internal pressure of the shell rises, the internal pressure is quickly reduced. An object of the present invention is to provide a grab bucket for firewood that can be escaped. An object of the present invention is to simplify the structure around the drain port.

  As shown in FIG. 2, the glove bucket for dredging of the present invention can be opened and closed by an upper frame 1, a lower frame 3 suspended by an upper frame 1 via an opening / closing rope 2, and a shell shaft 4 provided on the lower frame 3. And a pair of left and right arms 6 provided between the upper frame 1 and the left and right bucket shells 5, and the lower end side of the arm 6 is connected to the bucket shell 5 via a rod pin 12. It is connected.

  As shown in FIG. 1, a triangular water drain port 15 is opened in the upper wall 5 a of the bucket shell 5. An opening / closing body 17 that opens and closes the drainage port 15 from the outer surface side is fixed along one side of the drainage port 15 and is supported so as to be swingable and openable around the fixed end side. The opening / closing body 17 is configured to include a rubber lid 18 that is in close contact with the opening peripheral wall of the drain port 15 in the closed state.

  The opening / closing body 17 includes a rubber lid 18 and a regulation body 23 that prevents the rubber lid 18 from dropping into the drain port 15 in the closed state.

  The rubber lid 18 is formed in a triangular shape similar to the drain port 15.

  The rubber lid 18 is made of a rubber plate material that can be bent and deformed so that the rubber lid 18 can be bent and deformed in a direction away from the drain port 15.

  A reinforcing body made of metal is embedded in the rubber lid 18. Examples of the reinforcing body include a metal wire such as a lattice-shaped wire mesh, a wire, a piano wire, and a stainless steel wire.

  A weight for closing and urging the rubber lid 18 is provided on the rubber lid 18.

  The restricting body 23 is made of metal also serving as a weight that closes and biases the rubber lid 18.

  The restricting body 23 is composed of a metal strip, and is disposed between the center of gravity of the rubber lid 18 and the rocking tip in parallel with the fixed side portion of the opening / closing body 17.

  The bucket shell 5 includes a flat upper wall 5a and an inclined wall 5b continuous with the upper wall 5a. A drainage port 15 is opened in the upper wall 5 a, and a receiving frame 16 that receives the rubber lid 18 is fixed to the outer surface of the opening peripheral wall of the drainage port 15. The inclined wall 5b is positioned above the rod pin 12 in the fully closed posture of the bucket shell 5, and is inclined obliquely downward from the boundary with the upper wall 5a.

  In the present invention, the opening / closing body 17 that opens and closes the drainage port 15 from the outer surface side includes the rubber lid 18 that is in close contact with the opening peripheral wall of the drainage port 15. According to this, compared with the conventional lid structure in which the U-shaped frame is fixed to the inner and outer surfaces of the rubber lid, the drainage port 15 is closed with high sealing performance, and the mud in the shell is surely discharged. Can be prevented. Since the rubber lid 18 itself also serves as a sealing body, there is no need to provide a separate sealing structure, and the peripheral structure of the opening / closing body 17 can be simplified to reduce manufacturing costs. Further, since the drain port 15 is directly opened and closed by the rubber lid 18, the overall weight of the opening and closing body 17 can be reduced as compared with the conventional lid structure in which the U-shaped frame is fixed to the inner and outer surfaces of the rubber lid. Therefore, when the internal pressure of the shell rises, the drainage port 15 can be quickly opened, and the internal pressure can be accurately released out of the shell.

  If the opening / closing body 17 is composed of the rubber lid 18 and the regulating body 23, the rubber lid 18 falls into the drain port 15 when a large water pressure acts on the outer surface of the opening / closing body 17, for example, when the bucket is lifted. Can be surely blocked by the regulating body 23, the drainage port 15 can be reliably sealed, and mud outflow can be reliably prevented.

  When the rubber lid 18 is formed in a triangular shape similar to the drainage port 15, the area on the swinging tip side of the rubber lid is significantly smaller than the conventional configuration in which the rubber lid is rectangular. Therefore, the resistance received from seawater when the opening / closing body 17 returns to the closed state can be reduced compared to the conventional case, and thus the opening / closing body 17 can be quickly returned to the closed state. Further, when the internal pressure of the shell increases, the rubber lid 18 can be quickly opened.

  If the rubber lid 18 is made of a rubber plate material that can be bent and deformed so that the rubber lid 18 can be bent and deformed in a direction away from the drain port 15, a load when the rubber lid 18 swings and opens is rubber lid. The inconvenience concentrated on a part of 18 can be eliminated, and the durability of the rubber lid 18 can be improved. Further, it is possible to perform an opening operation in which the rubber lid 18 moves away from the opening peripheral wall in order from the swinging front end side, and a closing operation in which the rubber lid 18 contacts the opening peripheral wall in order from the swinging base end side. That is, it is possible to partially open and close the water drain port 15 on the swing tip side, and it is possible to speed up the response operation at the time of opening and closing.

  When a reinforcing body made of metal is embedded in the rubber lid 18, it is possible to reinforce the strength of the rubber lid 18 in the bending deformation direction and prevent the rubber lid 18 from being elastically deformed more than necessary when the rubber lid 18 is opened. The formed rubber lid 18 can be reliably returned to a flat state along the opening surface of the drain port 15. In other words, the rubber lid 18 can be prevented from warping outward as time passes. Therefore, the sealing performance between the rubber lid 18 and the opening peripheral wall of the drain port 15 can be maintained over a long period of time, and the durability of the rubber lid 18 can be improved.

  If a weight for closing and energizing the rubber lid 18 is provided, the opened rubber lid 18 can be quickly returned to the closed state against the resistance of water. Further, the rubber lid 18 can be prevented from being inadvertently opened due to the bucket shell 5 and the mud mud inside the bucket shell 5 swaying, and the rubber lid 18 can be kept sealed.

  If the restricting body 23 is made of a metal that also serves as a weight, the structure of the opening / closing body 17 can be simplified and the cost required for manufacturing the opening / closing body 17 can be reduced as compared with the case where both are separated. Moreover, the replacement cost when replacing the deteriorated opening / closing body 17 can be reduced.

  When the restricting body 23 is formed of a metal band plate and arranged parallel to the fixed side portion of the opening / closing body 17 between the center of gravity of the rubber lid 18 and the swinging tip, the opening / closing is performed by the weight of the rubber lid 18 and the regulating body 23. Since the body 17 can be held in the closed state, the rubber lid 18 can be prevented from being unintentionally opened and swung while the top side of the rubber lid 18 that is easily lifted away is securely held in the closed state by the weight of the regulating body 23. .

  When the drainage port 15 is opened using the flat upper wall 5a of the bucket shell 5, the structure of the shell wall can be simplified and the manufacturing cost can be reduced as compared with the drainage port having a cylindrical structure (Patent Document 2). Further, when the bucket shell 5 is provided with the inclined wall 5b inclined obliquely downward from the boundary with the upper wall 5a in the fully closed posture, the resistance of seawater when the bucket shell 5 is lifted can be reduced.

It is a top view of the principal part of the bucket shell which concerns on this invention. It is a front view of a grab bucket. It is a vertical front view which shows the fully closed attitude | position of a bucket shell. It is a disassembled perspective view which shows the attachment structure of an opening / closing body. It is the sectional view on the AA line of FIG.

(Embodiment) An embodiment of a glove bucket for straw according to the present invention will be described with reference to FIGS. In FIG. 2, the grab bucket is composed of a pair of left and right bucket shells supported by an upper frame 1, a lower frame 3 suspended by an upper frame 1 via an opening / closing rope 2, and a shell shaft 4 provided on the lower frame 3. 5 and a pair of left and right arms 6 provided between the upper frame 1 and the left and right bucket shells 5. In the following description, front and rear, left and right, and top and bottom are specified according to the character display indicating the crossing arrows and directions shown in FIGS.

  The open / close rope 2 is wound around sheave groups 8 and 9 provided on the opposing surfaces of the upper and lower frames 1 and 3 to form a movable pulley, and the upper end of the open / close rope 2 is a crane beam installed on a dredger or trolley. It is connected to the winch through. The main rope 10 that supports the entire bucket is also connected to the winch via the crane beam. The upper end side of each arm 6 is connected to the upper frame 1 via a pin 11, and the lower end side is connected to the bucket shell 5 via a rod pin 12.

  The bucket shell 5 includes an upper wall 5a that is substantially horizontal in the fully closed position shown in FIG. 3, a slant wall 5b that slopes downward toward the outer edge side in the left-right direction, and a substantially vertical line that continues to the slant wall 5b. A vertical wall 5c, a bottom wall 5d that is curved outwardly continuously from the vertical wall 5c and is inclined downward toward the center in the left-right direction, and a pair of front and rear walls that block the front and rear of the walls 5a to 5d. The upper wall 5a, the bottom wall 5d, and the edges of the front and rear walls constitute a mud scoop opening. When the bucket shell 5 is in the fully closed posture, the boundary portion between the inclined wall 5b and the vertical wall 5c, which is the left end or the right end, is located above the rod pin 12 in the fully closed posture. The inclined wall 5b serves to guide the seawater that the upper wall 5a pushes away when lifting the bucket shell 5 in the fully closed posture to the left and right outer sides. That is, when the inclined wall 5b is provided between the upper wall 5a and the vertical wall 5c, the resistance of seawater when the bucket shell 5 is lifted is reduced as compared with the case where the upper wall 5a is directly connected to the vertical wall 5c. Can do.

  As shown in FIG. 1, two drain holes 15 are opened side by side on the upper wall 5 a of each bucket shell 5 near the boundary with the inclined wall 5 b. The drainage port 15 is formed in a regular triangle shape with one side extending in the front-rear direction and the angle formed by the other two sides facing the center in the left-right direction. A triangular frame-shaped receiving frame 16 is attached to the peripheral portion of the drainage port 15 on the outer surface side of the upper wall 5a. The inner peripheral shape of the receiving frame 16 is substantially equal to the shape of the drain hole 15.

  Each drainage port 15 is provided with an opening / closing body 17 for opening and closing it. The opening / closing body 17 includes a triangular plate-shaped rubber lid 18 that can be elastically deformed, and a regulating body 23 that is fixed to the outer surface of the rubber lid 18. The rubber lid 18 is made of hard rubber and is formed in a triangular shape similar to the drainage port 15 that is slightly larger than the inner periphery of the receiving frame 16 and smaller than the outer periphery. Although not shown in the figure, a lattice-like wire net is embedded in the rubber lid 18, thereby reinforcing the strength of the rubber lid 18 in the bending deformation direction.

  The rubber lid 18 is fixed to the outer surface side of the receiving frame 16 along a side portion extending in the front-rear direction of the drainage port 15. The fixed side portion of the rubber lid 18 is sandwiched between the inside and outside by the receiving frame 16 and the belt-like pressing plate 19. Specifically, as shown in FIG. 4, the screw shaft 20 protrudes from a total of three locations including the front and rear end portions of the receiving frame 16 and the intermediate portion thereof, and a rubber lid 18 and a holding plate 19 are inserted into the screw shaft 20 in the order of description. After that, the rubber lid 18 is fixed to the bucket shell 5 by screwing the nut 21.

  As shown by a solid line in FIG. 5, the opening / closing body 17 is normally closed, closely contacts the entire periphery of the inner peripheral edge of the receiving frame 16, and closes the drain port 15. On the other hand, when the water pressure acting on the inner surface of the opening / closing body 17 increases, as shown by the phantom line in FIG. 5, it swings in the direction away from the receiving frame 16 around the fixed end side, and opens. Open.

  The restricting body 23 is provided to prevent the rubber lid 18 from dropping into the drain port 15 when a large water pressure is applied to the outer surface of the opening / closing body 17 such as when the bucket shell 5 is lifted. The restricting body 23 is composed of a metal band plate that also serves as a weight for closing and biasing the rubber lid 18, and is parallel to the fixed side portion of the rubber lid 18 between the center of gravity of the rubber lid 18 and the swinging tip. It is arranged in. Both ends of the restricting body 23 overlap the receiving frame 16. The restricting body 23 is fastened and fixed to the rubber lid 18 with a pair of front and rear bolts 24 and nuts 25.

  Next, the usage method of the grab bucket which concerns on this embodiment, and the motion of the opening-closing body 17 in that case are demonstrated. In this grab bucket, the main rope 10 is unwound and lowered to the seabed in a state where the bucket shell 5 is in a fully open position as shown in FIG. While the bucket shell 5 is being lowered, the opening / closing body 17 is pushed by the seawater in the shell as shown in FIG. Open. When the drainage port 15 is opened, the seawater in each shell flows out of the shell through the two drainage ports 15, so that the resistance received by the bucket shell 5 from the seawater is reduced.

  When the bucket shell 5 approaches the seabed and the descent speed of the bucket shell 5 decreases, the momentum of the seawater flowing out from the drain port 15 is weakened. Therefore, the opening / closing body 17 is biased in the closing direction by the weight of the rubber lid 18 and the regulating body 23 and the elastic restoring force of the rubber lid 18, and swings in the direction approaching the receiving frame 16 with the fixed end portion as the center. To return to the closed state. When the bucket shell 5 eventually reaches the seabed and seawater does not flow out of the drainage port 15, the rubber lid 18 comes into close contact with the receiving frame 16 and the drainage port 15 is closed.

  The bucket shell 5 that has reached the seabed is closed to scoop the mud. Specifically, when the open / close rope 2 is wound up from the state shown in FIG. 2 and the lower frame 3 is pulled up, the left and right bucket shells 5 turn around the rod pin 12 and simultaneously approach each other around the shell shaft 4. Rocks. While the bucket shell 5 is in the fully open state to the fully closed state, the pair of arms 6 swings slightly in the direction of approaching each other around the pin 11 on the upper end side.

  As the bucket shell 5 approaches and swings, silt is gradually scooped into the shell. The seawater in the shell before scooping the silt flows out of the shell in the form of being pushed out by the silt. This seawater flows out from the scooping opening of the bucket shell 5 when the bucket shell 5 has just started to swing, but when the bucket shell 5 is close to the fully closed position, it cannot flow out of the scooping opening. The opening / closing body 17 is pushed up to flow out of the shell through the drainage port 15. Therefore, the opening / closing body 17 is pushed up by the seawater to be in an open state as in the lowering of the bucket shell 5 and opens the water drain port 15.

  When the bucket shell 5 is in the fully closed posture and the outflow of seawater from the drain port 15 is stopped, the opening / closing body 17 is urged in the closing direction as before and returns to the closed state. However, in this case, since the upper wall 5a of the bucket shell 5 is horizontal, the influence of the weight of the rubber lid 18 and the regulating body 23 becomes larger than when the upper wall 5a is inclined. Therefore, the opening / closing body 17 is urged in the closing direction with a stronger urging force than when the bucket shell 5 is lowered and stopped. After the drain port 15 is closed, the main rope 10 is wound up and the bucket is lifted from the seabed.

  As described above, in the present embodiment, the rubber lid 18 is in close contact with the entire periphery of the inner peripheral edge of the receiving frame 16 in the closed state of the opening / closing body 17. According to this, it is possible to reliably prevent the mud in the shell from flowing out by closing the drain port 15 with high sealing performance. Since the opening / closing body 17 is composed of the rubber lid 18 and the regulating body 23 made of a metal strip, the overall weight of the opening / closing body 17 can be reduced. Therefore, when the internal pressure of the shell rises, the drainage port 15 can be quickly opened and the internal pressure can be accurately released out of the shell. Further, when the rubber lid 18 is formed in a triangular shape, the resistance received from the seawater when returning to the closed state is smaller than when the rubber lid 18 is rectangular, so that the opening / closing body 17 can be quickly returned to the closed state. Can do.

  In addition, the shapes of the drain port 15 and the rubber lid 18 are not limited to those shown in the above embodiment, and may be, for example, an isosceles triangle having a side length different from the other two sides. If necessary, the rubber lid 18 may have a trapezoidal shape or a tongue shape covering the entire drainage port 15, and in short, it may be a tapered shape. Further, the rubber lid 18 does not need to be a rubber plate material having a uniform thickness, and can be formed of, for example, a rubber molded product in which the peripheral portion has a larger thickness than the central portion.

  The numbers and orientations of the drain holes 15 and the opening / closing bodies 17 are not limited to those shown in the above embodiment. The fixed side of the rubber lid 18 can be selected from the three sides according to the situation. The restricting body 23 can be made of plastic in addition to metal, and the shape thereof may be T-shaped, Y-shaped, mountain-shaped, arc-shaped, or the like. Any structure can be used as long as it can be prevented from falling into the outlet 15. When the weight for closing and energizing the opening / closing body 17 and the regulating body 23 are separated, the weight can be provided on the outer surface of the rubber lid 18 or the like.

1 Upper frame 2 Opening / closing rope 3 Lower frame 4 Shell shaft 5 Bucket shell 6 Arm 12 Rod pin 15 Drain port 16 Receiving frame 17 Opening / closing body 18 Rubber lid 23 Regulator

Claims (9)

The upper frame (1), the lower frame (3) suspended by the upper frame (1) via the opening / closing rope (2), and the shell shaft (4) provided on the lower frame (3) can be pivotally supported. A pair of left and right bucket shells (5) and a pair of left and right arms (6) provided between the upper frame (1) and the left and right bucket shells (5),
In the grab bucket in which the lower end side of the arm (6) is connected to the bucket shell (5) via the rod pin (12),
A triangular drainage opening (15) is opened on the upper wall (5a) of the bucket shell (5),
An opening / closing body (17) for opening and closing the drain port (15) from the outer surface side is fixed along one side of the drain port (15) and is supported so as to be able to swing open and close around the fixed end side. Has been
A glove bucket for a bag characterized in that the openable / closable body (17) includes a rubber lid (18) that is in close contact with the opening peripheral wall of the drain port (15) in the closed state.   The opening / closing body (17) comprises a rubber lid (18) and a regulating body (23) for preventing the rubber lid (18) from dropping into the drain port (15) in the closed state. The grab bucket for firewood according to 1.   The grab bucket for straw according to claim 2, wherein the rubber lid (18) is formed in a triangular shape similar to the drainage opening (15).   The glove bucket for dredging according to claim 2 or 3, wherein the rubber lid (18) is made of a rubber plate material that can be bent and deformed, and can be bent and deformed in a direction away from the drain port (15).   The grab bucket for straw according to claim 4, wherein a reinforcing body made of metal is embedded in the rubber lid (18).   The bag glove bucket according to any one of claims 2 to 5, wherein a weight for closing and urging the rubber lid (18) is provided on the rubber lid (18).   The grab bucket for a bag according to any one of claims 2 to 5, wherein the regulating body (23) is made of metal also serving as a weight for closing and biasing the rubber lid (18).   The restricting body (23) is formed of a metal strip, and is disposed in parallel with the fixed side portion of the opening / closing body (17) between the center of gravity of the rubber lid (18) and the rocking tip. The grab bucket for firewood described. The bucket shell (5) includes a flat upper wall (5a) and an inclined wall (5b) continuous with the upper wall (5a).
A drainage opening (15) is opened in the upper wall (5a), and a receiving frame (16) for receiving the rubber lid (18) is fixed to the outer surface of the opening peripheral wall of the drainage opening (15),
The inclined wall (5b) is located above the rod pin (12) in the fully closed posture of the bucket shell (5), and is inclined obliquely downward from the boundary with the upper wall (5a). A grab bucket for firewood according to any one of the above.

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