JP4851634B1 - Grab bucket - Google Patents

Abstract

A grab bucket capable of dredging or excavating on a smooth surface even if the work target surface is a horizontal surface or a slope by configuring the suspension posture of the bucket body so as to be changeable with respect to the suspension body. provide.
A suspension body 4 suspended by a main wire 2 and a bucket body 5 supported by the suspension body 4 are provided. The bucket body 5 and the suspension body 4 are connected to each other through a swing shaft 13 provided between them and a suspension bracket 14 supported by the swing shaft 13 so as to be relatively rotatable. The upper frame 6 of the bucket body 5 is provided with a plurality of sets of angle adjustment holes 44 for connecting the suspension bracket 14. The connection position of the suspension bracket 14 with respect to the plurality of sets of angle adjustment holes 44 is changed, and the suspension posture of the bucket body 5 is changed to a horizontal posture in which the lower end edge of the bucket shell 9 is horizontal, and an inclined posture that is inclined from the horizontal posture. And can be changed.
[Selection] Figure 1

Description

  The present invention relates to a grab bucket for use in dredging or excavating silt or sediment deposited on the seabed or the like, for example. The grab bucket of the present invention can be crushed into a smooth surface or excavated even if the work target surface is not only a horizontal plane but also an inclined surface.

  In the work of dripping the seabed using a grab bucket, the work target surface is not only a horizontal plane but also a slope such as a slope. Thus, even when the work target surface is a slope, a scissor device that can scoop the slope into a smooth surface is known, for example, from Patent Document 1.

  The scissor device described in Patent Document 1 is held horizontally by a grab bucket having a pair of bucket shells that rotate around a support shaft to open and close, a pair of elevating chains that elevate and lower the bucket shell. Elevating means including a suspension member and opening / closing means including an opening / closing wire for opening and closing the bucket shell are provided. When the bucket shell is suspended only by a pair of lifting chains, the bucket shell is suspended in a posture in which the blade edge is horizontal (hereinafter referred to as a horizontal posture). In addition, when the suspension length adjustment chain is connected to one of the lifting chains, the bucket shell is suspended in a posture in which the blade edge is inclined from the horizontal (hereinafter referred to as an inclined posture). It is done. Two lifting wires that support the entire grab bucket and lift it up and down are connected to both ends of the suspension member. Opening and closing wires that open and close the bucket shell are connected to the bucket shell. The raising / lowering operation of the grab bucket and the opening / closing operation of the bucket shell can be performed by winding or lowering the lifting / lowering wire and the opening / closing wire with a winch.

JP2011-58167A (paragraph number 0013, FIG. 7)

  In the saddle device of Patent Document 1, a pair of bucket shells are suspended in a horizontal posture or an inclined posture by simply changing the length of a suspension length adjustment chain connected to one of a pair of lifting chains. Can do. Therefore, the work target surface can be wrinkled into a smooth surface corresponding to the gradient without being wrinkled stepwise regardless of a horizontal plane or a slope. In the dredging device, the grab bucket suspended from the crane tip by the lifting / lowering wire at the time of dredging tends to be located directly below the crane tip where the center of gravity is the drooping start end of the wire. Since the gravity center position of the grab bucket on the horizontal plane is substantially at the center of the grab bucket, each wire suspends the grab bucket in a state of being suspended substantially vertically from the tip of the crane.

  However, when the bucket shell grabs the sediment on the seabed, the gravity center position of the grab bucket may deviate from the center depending on the content of the sediment. If each wire is wound up in a state where the center of gravity is shifted, the center of gravity of the grab bucket moves just below the tip of the crane, so that the entire grab bucket is swung and the wires are suspended in a state where they are not vertical. In this state, the load acting on each wire, in particular, the two lifting wires becomes non-uniform, and the loads acting on the two winches are not the same, so a stable winding operation cannot be performed. . Further, each wire wound in an oblique state may cause a twist at the hanging start end of the wire at the tip of the crane, and the grab bucket may be greatly shaken. Furthermore, since the bucket shell is only suspended by the lifting / lowering chain and the adjustment chain with respect to the suspension member, the posture of the bucket shell can be freely changed with respect to the suspension member. For this reason, when the grab bucket descends underwater, there is a risk that the bucket shell that has received the resistance of water will swing irregularly with respect to the suspension member.

  The object of the present invention is to make it possible to change the suspension posture of the bucket body relative to the suspension body, so that even if the work target surface is a horizontal surface or a slope such as a slope, these work target surfaces are smooth surfaces. It is to provide a grab bucket that can perform dredging or excavation. The object of the present invention is not to apply a biased load to the crane that holds the grab bucket and the winch that moves up and down even when the position of the center of gravity of the bucket body deviates from the center position due to the contents of the accumulated sediment. To provide grab buckets.

  The grab bucket of the present invention includes a suspension body 4 that is suspended by a main wire 2 and a bucket body 5 that is supported by the suspension body 4. The bucket body 5 and the suspension body 4 are connected to each other through a swing shaft 13 provided between them and a suspension bracket 14 supported by the swing shaft 13 so as to be relatively rotatable. The upper frame 6 of the bucket body 5 is provided with a plurality of sets of angle adjustment holes 44 for connecting the suspension bracket 14. And the connection position with respect to several sets of angle adjustment holes 44 of the suspension bracket 14 is changed, and the suspension attitude | position of the bucket main body 5 inclines from the horizontal attitude | position where the lower end edge of the bucket shell 9 becomes horizontal, and a horizontal attitude | position. It can be changed to an inclined posture.

  The lower frame 7 of the bucket body 5 is supported by the opening / closing wire 3 via the lower sheave unit 22. The lower frame 7 and the lower sheave unit 22 are connected to each other through a support shaft 28 so as to be relatively rotatable.

  A lower sheave unit 22 is disposed in an opening 21 provided in the lower frame 7 that penetrates vertically. A base support portion 27 provided on the lower frame 7 and protruding downward is connected to the lower sheave unit 22 via a support shaft 28.

  The upper frame 6 and the bucket shell 9 of the bucket body 5 are connected via an arm 10. The upper frame 6 is formed in a square frame shape by left and right frames 37 and 38 and front and rear frames 40 and 41 that connect both ends of the left and right frames 37 and 38, respectively. The left and right frames 37 and 38 are provided with an arm bracket 39 for connecting the arm 10 and a mounting base 43 disposed above the arm bracket 39. A plurality of sets of angle adjusting holes 44 are formed in the mounting base 43.

  The grab bucket according to the present invention includes a suspension body 4 suspended by a main wire 2 and a bucket body 5 supported by the suspension body 4. It was made to connect so that relative rotation was possible via the suspension bracket 14 supported by the axis | shaft 13. As shown in FIG. Further, a plurality of sets of angle adjustment holes 44 for connecting the suspension bracket 14 are provided in the upper frame 6 of the bucket body 5 so that the connection position of the suspension bracket 14 to the bucket body 5 can be changed.

  As described above, when the connection position of the suspension bracket 14 to the bucket body 5 can be changed, the suspension balance of the bucket body 5 with respect to the suspension body 4 can be changed. Specifically, the position of the center of gravity of the bucket body 5 connected by the suspension shaft 13 always tries to be located on the vertical axis passing through the center of the suspension shaft 13. Therefore, when the connection position of the suspension bracket 14 and the bucket body 5 is changed, the bucket body 5 rotates around the suspension shaft 13 in a posture corresponding to the suspension balance. Accordingly, when the position of the center of gravity of the bucket body 5 is deviated from the vertical axis passing through the center of the suspension shaft 13, the bucket body 5 rotates around the suspension shaft 13 and is suspended in an inclined posture. . Accordingly, the suspension position of the bucket body 5 is changed between the horizontal posture and the inclined posture by changing the connection position of the suspension bracket 14 to the bucket body 5 to change the suspension balance, so that the work target surface is a horizontal plane. Or, even if it is a slope, dredging or excavation can be performed on a smooth surface.

  Further, even if the position of the center of gravity of the bucket body 5 is deviated from the center position due to the contents of the deposit caught during dredging, the bucket body 5 can be rotated by the suspension shaft 13 with respect to the suspension body 4. The direction of the load acting on the suspension body 4 can always be made constant. Therefore, the direction of the load acting on the main wire 2 that suspends the suspension body 4 can be made constant at all times, and a biased load is given to the crane that suspends the grab bucket 1 and the winch that performs the lifting operation. Absent. In addition, since the bucket body 5 is connected by a suspension bracket 14 that is pivotally supported by the suspension body 4, the grab bucket 1 is different from the dredge device of Patent Document 1 that supports the bucket body with a lifting chain and an adjustment chain. When the water descends underwater, the bucket body 5 that receives the resistance of water does not swing irregularly with respect to the suspension body 4.

  When the lower frame 7 and the lower sheave unit 22 are connected to each other via the support shaft 28 so as to be rotatable relative to each other, for example, when the attitude of the bucket body 5 is inclined as shown in FIG. It is possible to prevent the inclination from following. Therefore, the lower frame 7 can be supported by the opening / closing wire 3 in a state where the lower sheave unit 22 is always oriented in the optimum direction, and the lifting operation of the lower frame 7 can be performed smoothly. Further, an extra load is not applied to the winch that performs the winding or lowering operation of the opening / closing wire 3 wound around the lower sheave unit 22.

  A lower sheave unit 22 is arranged inside an opening 21 that penetrates in the upper and lower portions provided in the lower frame 7, and a base support portion 27 that is provided in the lower frame 7 and protrudes downward, and the lower sheave unit 22 is attached to a support shaft 28. It was made to connect through. Thus, when the lower sheave unit 22 is connected to the lower side of the lower frame 7 using the space occupied by the lower frame 7, the facing distance between the upper frame 6 and the lower frame 7 in a state where the bucket shell 9 is closed is set. Can be small. Therefore, since it can suppress that the total height of the bucket main body 5 becomes high, it can prevent that the grab bucket 1 enlarges. In addition, by suppressing the overall height of the bucket body 5 from being increased, it is possible to prevent the length of the arm 10 of the bucket body 5 from being increased, and it is advantageous in that the manufacturing cost of the grab bucket 1 can be suppressed. is there.

  The left and right frames 37 and 38 and the front and rear frames 40 and 41 constitute the upper frame 6, arm brackets 39 are provided on the left and right frames 37 and 38, and a plurality of sets of angle adjustments are made to the mounting base 43 provided above the brackets 39. When the hole 44 is formed, the suspension bracket 14 can be easily attached and detached. Specifically, when changing the connecting position of the suspension bracket 14 with respect to the plurality of sets of angle adjustment holes 44, the suspension bracket 14 can be attached and detached without being disturbed by the arm bracket 39, and the suspension posture can be quickly suspended. Changes can be made.

It is a side view of the grab bucket concerning the present invention. It is a vertical front view of a grab bucket. It is a side view which shows the state which isolate | separated the suspension body and the bucket main body. It is a top view of a grab bucket. It is a top view of a lower frame. It is a vertical side view which shows the state which closed the bucket shell in the state with the bucket main body in the inclination attitude | position. It is a vertical side view which shows the state which opened the bucket shell in the state which the bucket main body inclines.

(Embodiment) Fig. 1 to Fig. 7 show an embodiment of a grab bucket according to the present invention. The grab bucket is applied when dredging or excavating silt and sediment deposited on the seabed. In the present invention, front / rear, left / right, and upper / lower follow the crossing arrows shown in the figure and the front / rear, left / right, and upper / lower indications shown near each arrow. As shown in FIGS. 1 and 2, the grab bucket 1 is detachably attached to the hanger 4 and the hanger 4 suspended by two main wires 2 suspended from a crane of a hoist ship (not shown). And a bucket body 5 that seizes sediments on the seabed.

  The bucket body 5 includes an upper frame 6, a lower frame 7 suspended by the upper frame 6 via the opening / closing wire 3, and a pair of left and right bucket shells 9 supported by a shell shaft 8 provided on the lower frame 7 so as to be freely opened and closed, It is composed of a pair of left and right arms 10 provided between the upper frame 6 and the left and right bucket shells 9. The main wire 2 and the open / close wire 3 are each connected to a winch via a crane, and the raising / lowering operation of the grab bucket 1 and the opening / closing operation of the bucket shell 9 can be performed by hoisting or lowering the winch. it can.

  As shown in FIGS. 3 and 4, the hanger 4 includes a suspension frame 12 to which two main wires 2 are connected, and a pair of left and right slidably coupled to the suspension frame 12 via a suspension shaft 13. The suspension bracket 14. The suspension frame 12 includes a frame base 15 and wire connection bases 16 protruding upward from the front and rear edge central portions of the frame base 15. 13 is provided. An upper sheave box 50 described later is integrally fixed to the lower surface of the frame base 15. The main wire 2 is connected to each wire connection base 16, and the frame base 15 is suspended horizontally. The suspension bracket 14 is formed in an inverted T shape, and connecting holes 17 for connecting and fixing to the upper frame 6 are formed in the front and rear end portions thereof in a penetrating manner.

  As shown in FIGS. 1, 2, and 5, the lower frame 7 includes a rectangular frame-shaped frame base 19 in plan view and an arm bracket 20 formed integrally with the front and rear walls of the frame base 19. An opening 21 penetrating vertically is formed in the frame base 19, and a lower sheave unit 22 is disposed in the opening 21 (see FIG. 5). The lower sheave unit 22 includes a lower sheave box 23 and a box base 26 to which the lower sheave box 23 is fixed. Four lower sheaves 24 are rotatably supported on the lower sheave box 23 by a lower sheave shaft 25. A base support portion 27 protrudes downward from the lower surfaces of the left and right frames of the frame base 19, and the lower sheave unit 22 is supported by supporting the box base 26 via the support shaft 28 on the base support portion 27. Is connected to the lower frame 7 so as to be relatively rotatable. In order to avoid interference between the frame base 19 and the lower sheave box 23, the front and rear wall portions of the opening 21 are formed in a tapered surface having a tapered shape (see FIG. 6). Thus, when the lower sheave unit 22 is connected to the lower side of the lower frame 7 using the space occupied by the lower frame 7, the facing distance between the upper frame 6 and the lower frame 7 in a state where the bucket shell 9 is closed is set. Can be small. Thereby, since it can suppress that the total height of the bucket main body 5 becomes high, it can prevent that the grab bucket 1 enlarges.

  The bucket shell 9 includes a shell 30, a shell arm 31 for connecting the shell 30 to the lower frame 7, and an arm bracket 33 for connecting the lower end of the arm 10 via a pin 32. The shell 30 includes an arc-shaped bottom wall 30a, a substantially square upper wall 30b extending from the upper end edge of the bottom wall 30a, and a pair of front and rear walls closing the front and rear of the walls 30a and 30b. A rectangular scoop is formed by the edges of the wall 30a, the upper wall 30b, and the front and rear walls. The shell arms 31 of the left and right bucket shells 9 are rotatably supported by the arm bracket 20 of the lower frame 7 via the shell shaft 8. The edge of the bottom wall 30a and the rotation center axis of the shell shaft 8 are parallel to each other. When the bucket body 5 is in a horizontal posture, the edge of the bottom wall 30a is horizontal.

  As shown in FIGS. 2 and 4, the upper frame 6 has a rectangular frame shape in which an opening 36 penetrating vertically is formed in a plan view. The upper frame 6 includes left and right frames 37 and 38 extending in the front-rear direction, and left and right frames 37 and 38. It is comprised by the front-and-rear frames 40 and 41 which each connect both ends. The left and right frames 37 and 38 are respectively provided with arm brackets 39 at four locations, for a total of eight locations, and the upper ends of the pair of left and right arms 10 are connected to the arm bracket 39 via pins 42. As shown in FIGS. 1 and 3, each of the left and right frames 37 and 38 is formed with an isosceles trapezoidal mounting base 43 in a side view above the upper end of the arm bracket 39. A plurality of sets of angle adjusting holes 44 are formed in a penetrating manner at different positions in the front-rear direction.

  The pair of angle adjustment holes 44 is provided with angle adjustment holes 44a for making the posture of the bucket body 5 horizontal and angle adjustment holes 44b, 44c, 44d and 44e for making the posture of the bucket body 5 inclined. The hanger 4 and the bucket body 5 can be integrated by connecting and fixing the connection holes 17 of the front and rear suspension brackets 14 and any one of the angle adjustment holes 44 with the connection tool 46 at four positions. . The connecting tool 46 includes a bolt 47 that is inserted through the connecting hole 17 and the angle adjusting hole 44, and a nut 48 that is screwed onto the screw shaft of the bolt 47.

  The suspension posture of the bucket body 5 with respect to the hanger 4 is such that the position of the center of gravity of the bucket body 5 is the suspension position of the suspension bracket 14 when the suspension bracket 14 is fixed to the angle adjustment hole 44a. Since it is located on a vertical line passing through the center, the bucket body 5 is suspended in a horizontal state without being inclined (see FIG. 1). When the suspension bracket 14 is fixed to any one of the angle adjustment holes 44b, 44c, 44d, and 44e, the position of the center of gravity of the bucket body 5 is deviated from the vertical line of the suspension shaft 13. Since the bucket body 5 is pivotally supported by the suspension shaft 13, the bucket body 5 is rotated around the suspension shaft 13 so that the center of gravity of the bucket body 5 is located on the vertical line of the suspension shaft 13. Is suspended in an inclined posture with respect to the hanger 4 (see FIG. 6). Since the suspension shaft 13 is disposed at a substantially intermediate position where the two main wires 2 are connected, the load acts equally on the two main wires 2 regardless of the posture of the bucket body 5. Therefore, the load which is biased to the crane which suspends the grab bucket 1 and each winch which raises / lowers is not given. In the present embodiment, the inclination angle when connected and fixed to the angle adjustment hole 44b is 1/6 of the gradient, the angle adjustment hole 44c is 1/5 of the gradient, the angle adjustment hole 44d is 1/4 of the gradient, In the adjustment hole 44e, the hole positions of the angle adjustment holes 44b to 44e are determined so that the gradient becomes 1/3.

  As shown in FIGS. 2 and 3, an upper sheave box 50 is fixed to the lower surface of the frame base 15. In the upper sheave box 50, two upper sheaves 51 are rotatably supported by an upper sheave shaft 52. The two open / close wires 3 suspended from the crane are respectively inserted into wire guides 53 provided on the upper surface of the frame base 15, wound around the lower sheave 24, the upper sheave 51, and the lower sheave 24. The tip of 3 is fixed to the upper sheave box 50. The opening / closing wire 3 and the sheaves 24 and 51 constitute a boosting mechanism. When the open / close wire 3 is wound up, the lower sheave unit 22 is pulled toward the upper sheave box 50, so that the lower frame 7 moves upward and the left and right bucket shells 9 can be closed. On the contrary, when the open / close wire 3 is wound down, the lower frame 7 can move downward together with the lower sheave unit 22 by its own weight to open the left and right bucket shells 9.

  At this time, the lower sheave unit 22 is pivotally supported on the lower frame 7 by the support shaft 28 so that the bucket body 5 is in the horizontal posture shown in FIG. 1 or the inclined posture shown in FIG. In addition, the lower sheave unit 22 can be oriented in the direction in which the distance between the lower sheave shaft 25 and the upper sheave shaft 52 is the shortest. Further, as shown in FIGS. 6 and 7, even when the inclination of the edge of the bottom wall 30a differs between the closed state and the open state of the bucket shell 9, the lower sheave shaft 25 and the upper The lower sheave unit 22 can be oriented in the direction in which the distance from the sheave shaft 52 is the shortest. Thus, the lower sheave unit 22 can be prevented from following and tilting the bucket body 5, so that the lower frame 7 is supported by the opening / closing wire 3 in a state where the lower sheave unit 22 is always oriented in the optimum direction. Thus, the lower frame 7 can be smoothly moved up and down. Further, an extra load is not applied to the winch that performs the winding or lowering operation of the opening / closing wire 3 wound around the lower sheave unit 22.

  As described above, in this embodiment, the inclination of the edge of the bottom wall 30a differs between the state in which the bucket shell 9 is in the closed posture and the state in the open posture. This is because the position of the center of gravity of the bucket body 5 in the closed or open posture is slightly different. Since this angle difference is within the error range of the dredging operation, no problem occurs in the operation. In order to make the inclination angle the same, the grab bucket 1 may be designed so that the position of the center of gravity of the bucket body 5 in the closed or open posture is the same.

  Next, the operation when the suspension bracket 14 is connected and fixed to the angle adjusting hole 44e and the seabed dredging work is performed will be described. When the angle adjusting hole 44e is used, the bucket body 5 can be suspended in an inclined posture in which the inclination of the edge of the bottom wall 30a of the shell 30 is 1/3 when the bucket shell 9 is in the closed state (FIG. 6). reference). The hanger 4 and the angle adjustment hole 44e of the mounting base 43 are roughly aligned with the bucket body 5 being landed on the hoist ship, and then a bolt 47 is inserted into the connection hole 17 and the angle adjustment hole 44e. Are screwed in and integrated. At this time, since the angle adjusting hole 44e is located above the arm bracket 39, the connecting tool 46 can be tightened or loosened without being disturbed by the arm bracket 39. When the wires 2 and 3 are wound up after fixing the four connecting devices 46, the bucket body 5 swings so that the position of the center of gravity moves on the vertical line of the suspension shaft 13 as described above. The bucket body 5 can be suspended in an inclined posture with a gradient of 1/3 (see FIG. 6).

  The grab bucket 1 is moved immediately above the dredging work position, and the open / close wire 3 is lowered to open the bucket shell 9 (see FIG. 7). Furthermore, the main wire 2 is unwound and the grab bucket 1 is lowered to the dredging work position in the sea. At this time, since the bucket body 5 is connected by the suspension bracket 14 pivotally supported by the suspension body 4, when the grab bucket 1 descends underwater, the bucket body 5 receiving the water resistance is suspended. It does not swing irregularly with respect to the body 4. When the open / close wire 3 is wound up in a state where the grab bucket 1 is stopped at the dredging work position, the bucket shell 9 is closed while grasping the sediment on the seabed. After the bucket shell 9 grabs the deposit, the main wire 2 and the open / close wire 3 are simultaneously wound up to pull up the grab bucket 1 to the sea so that the open / close wire 3 does not loosen. The raised grab bucket 1 is moved onto the carrier ship, the open / close wire 3 is lowered to open the bucket shell 9, and the grabbed deposit is loaded on the carrier ship. The saddle work is performed by repeating the above work while sequentially changing the saddle position.

  As described above, when the connection position of the suspension bracket 14 to the bucket body 5 can be changed, the suspension balance of the bucket body 5 with respect to the suspension body 4 can be changed. Specifically, the position of the center of gravity of the bucket body 5 connected by the suspension shaft 13 always tries to be located on the vertical axis passing through the center of the suspension shaft 13. Therefore, when the connection position of the suspension bracket 14 and the bucket body 5 is changed, the bucket body 5 rotates around the suspension shaft 13 in a posture corresponding to the suspension balance. Accordingly, when the position of the center of gravity of the bucket body 5 is deviated from the vertical axis passing through the center of the suspension shaft 13, the bucket body 5 rotates around the suspension shaft 13 and is suspended in an inclined posture. . Accordingly, the suspension position of the bucket body 5 is changed between the horizontal posture and the inclined posture by changing the connection position of the suspension bracket 14 to the bucket body 5 to change the suspension balance, so that the work target surface is a horizontal plane. Or, even if it is a slope, dredging or excavation can be performed on a smooth surface.

  Further, even if the position of the center of gravity of the bucket body 5 is deviated from the center position due to the contents of the deposit caught during dredging, the bucket body 5 can be rotated by the suspension shaft 13 with respect to the suspension body 4. The direction of the load acting on the suspension body 4 can always be made constant. Therefore, the direction of the load acting on the main wire 2 that suspends the suspension body 4 can be made constant at all times, and a biased load is given to the crane that suspends the grab bucket 1 and the winch that performs the lifting operation. Absent. In addition, since the bucket body 5 is connected by a suspension bracket 14 that is pivotally supported by the suspension body 4, the grab bucket 1 is different from the dredge device of Patent Document 1 that supports the bucket body with a lifting chain and an adjustment chain. When the water descends underwater, the bucket body 5 that receives the resistance of water does not swing irregularly with respect to the suspension body 4.

  Although the above embodiment has been described in the form applied to a dredger on the seabed, it can also be used for cargo handling work from the ship. The bucket shell 9 is supported by one shell shaft 8, but this is not necessary, and the left and right bucket shells 9, 9 may be supported by different shell shafts 8, 8. Although the inclination angle for suspending the bucket body 5 is set to an integer ratio, it is not necessary, and can be arbitrarily set according to the work surface to be used, and the position or number can be freely selected and set at the time of design. be able to. The upper sheave box 50 and the lower sheave box 23 can be detachably attached to the frame base 15 and the box base 26, respectively. In this case, the upper sheave box 50 and the lower sheave box 23 can be separated from the hanger 4 and the lower frame 7 by providing each with a bracket and fixing with a detachable pin, thereby improving maintainability. be able to.

2 Main wire 3 Open / close wire 4 Suspension body (hanger)
5 Bucket body 6 Upper frame 7 Lower frame 9 Bucket shell 10 Arm 13 Suspension shaft 14 Suspension bracket 28 Support shaft 21 Opening 22 Lower sheave unit 27 Base support portion 28 Support shaft 37 Left frame 38 Right frame 39 Arm bracket 40 Front frame 41 Rear frame 43 Mounting base 44 Angle adjustment hole

Claims (4)

A suspension body (4) suspended by the main wire (2), and a bucket body (5) supported by the suspension body (4),
The bucket body (5) and the suspension body (4) rotate relative to each other via a swing shaft (13) provided between them and a suspension bracket (14) supported by the swing shaft (13). Are connected freely,
The upper frame (6) of the bucket body (5) is provided with a plurality of sets of angle adjustment holes (44) for connecting the suspension bracket (14),
The connection position of the suspension bracket (14) with respect to the plurality of sets of angle adjustment holes (44) is changed, and the suspension posture of the bucket body (5) is changed to a horizontal posture in which the lower end edge of the bucket shell (9) is horizontal. A grab bucket that can be changed from a horizontal posture to an inclined posture. The lower frame (7) of the bucket body (5) is supported by the opening / closing wire (3) via the lower sheave unit (22),
The grab bucket according to claim 1, wherein the lower frame (7) and the lower sheave unit (22) are connected to each other via a support shaft (28) so as to be relatively rotatable. A lower sheave unit (22) is disposed inside an opening (21) penetrating vertically in the lower frame (7),
The grab bucket according to claim 2, wherein a base support part (27) provided on the lower frame (7) and projecting downward is connected to the lower sheave unit (22) via a support shaft (28). . The upper frame (6) and the bucket shell (9) of the bucket body (5) are connected via the arm (10),
The upper frame (6) is formed in a square frame shape with left and right frames (37, 38) and front and rear frames (40, 41) that connect both ends of the left and right frames (37, 38), respectively.
The left and right frames (37, 38) are provided with an arm bracket (39) for connecting the arm (10) and a mounting base (43) disposed above the arm bracket (39).
The grab bucket according to any one of claims 1 to 3, wherein a plurality of sets of angle adjusting holes (44) are formed in the mounting base (43).

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