Grab bucket

Abstract

Providing a new club bucket capable of preventing damage to the suspension arm associated with the handling operation. 【Solution means】In the grab bucket 100 in which the bucket shell 50 is supported by a plurality of suspension arms 22 on the frame 30 capable of being suspended, the suspension arm 22 is provided with a guard member 70 extending in the longitudinal direction of the suspension arm 22. As a result, since the suspension arm 22 is protected by the guard member 70, even if the suspension arm 22 collides with a ship's hatch coaming or other structures during the handling operation, damage can be prevented.

Description

Technical Field

[0001] The present invention relates to a grab bucket used for handling bulk goods such as in ports.

Background Art

[0002] Conventionally, as a grab bucket used for handling bulk goods such as coal and gravel in ports, a grab bucket called a single-rope wireless cylinder type is often used. This grab bucket has a structure in which a pair of bucket shells for scooping up bulk goods are provided on a frame suspended by a crane via a single rope (wire rope) so as to be openable and closable, as shown in, for example, the following Invention Documents 1 and 2. Then, along with the lifting operation of the frame by the crane, the bucket shell is closed, and by wirelessly operating the extension of the hydraulic cylinder provided on the frame, the bucket shell can be remotely controlled to open.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in this single-rope wireless cylinder type grab bucket, each bucket shell is suspended by a plurality of suspension arms extending from the upper frame. Therefore, during the handling operation, there is a risk that this suspension arm may hit and damage the ship's hatch coaming or other structures.

[0005] Therefore, the present invention was devised to solve these problems, and its object is to provide a novel club bucket that can prevent damage to the suspension arm associated with the handling operation.

Means for Solving the Problems

[0006] In order to solve the above problems, a first invention is a grab bucket in which a pair of bucket shells are supported by a plurality of suspension arms on a frame that can be suspended, and the suspension arm is provided with a guard member extending in the longitudinal direction of the suspension arm. According to such a configuration, since the suspension arm is protected by the guard member, it is possible to prevent damage even if the suspension arm hits the ship's hatch coaming or other structures during the handling operation.

[0007] A second invention is a grab bucket according to the first invention, wherein the guard member is composed of a base plate attached to the surface of the suspension arm and a guard plate rising from the base plate. According to such a configuration, the guard member can be attached to the surface of the suspension arm by the base plate, and the guard plate rising from the base plate can prevent the suspension arm from directly hitting the ship's hatch coaming or other structures. Further, when the suspension arm hits strongly, the guard plate can be appropriately deformed to effectively relieve the impact on the suspension arm.

[0008] A third invention is a grab bucket according to the second invention, wherein one end or both ends of the guard plate are tapered. According to such a configuration, since there are no sharp corner portions at one end or both ends of the guard plate, it is possible to avoid severely damaging or destroying the ship's hatch coaming or other structures when they are hit.

[0009] The fourth invention is a grab bucket characterized in that, in the second invention, the guard member is detachably attached to the surface of the suspension arm by fastening means. According to such a configuration, when the existing guard member is damaged, it can be easily replaced with a new guard member by the fastening means.

[0010] The fifth invention is a grab bucket characterized in that, in the third invention, the fastening means comprises a through hole in the base plate, a screw hole on the suspension arm side, and a bolt screwed from the through hole in the base plate to the screw hole on the suspension arm side. According to such a configuration, the guard member can be easily attached to and detached from the suspension arm simply by fastening or removing the bolt to the screw hole on the suspension arm side.

Advantages of the Invention

[0011] According to the present invention, since the suspension arm is protected by the guard member, it is possible to prevent damage even if the suspension arm hits the hatch coaming of the ship or other structures during the cargo handling operation. Further, when the suspension arm hits strongly, the guard plate can be appropriately deformed to effectively mitigate the impact on the suspension arm. Furthermore, the present invention exhibits excellent effects such that the attachment / detachment work and replacement work of the guard member can be easily performed because the guard member is attached to the suspension arm using fastening means such as bolts.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIGS. 1 and 2 are perspective views showing an embodiment of the grab bucket 100 according to the present invention. FIG. 1 shows the state in which the bucket shells 50, 50 are open, and FIG. 2 shows the state in which the bucket shells 50, 50 are closed. In each figure, the X arrow indicates the width direction of the grab bucket 100, the Y arrow indicates the depth direction of the grab bucket 100, and the Z arrow indicates the suspension direction (height direction) of the grab bucket 100 (the same applies to the following drawings).

[0014] As shown in the figure, this grab bucket 100 mainly includes an intermediate movable frame 20 suspended by a pair of wire ropes W, W extending from the hanger 10, an upper frame 30 located above the intermediate movable frame 20, a lower frame 40 located below the intermediate movable frame 20, a pair of bucket shells 50, 50 attached to the lower frame 40, and a hydraulic cylinder 60 located between the intermediate movable frame 20 and the lower frame 40. The hanger 10 is further suspended by a hook extending from a crane (not shown).

[0015] The intermediate movable frame 20 includes a frame body 21 to which a pair of wire ropes W, W are connected, a tower portion 21a having a square tube shape, a pair of pulleys (not shown), etc., and is configured to move up and down between the upper frame 30 and the lower frame 40 by the pair of wire ropes W, W that extend downward through the upper frame 30. An hydraulic cylinder 60 can be accommodated in the tower portion 21a, and a piston rod 62 of the hydraulic cylinder 60 is connected to the top thereof.

[0016] The upper frame 30 includes a frame body 31 having a substantially rectangular shape, four suspension arms 22, 22, 22, 22 pivotally supported at the respective corners of the frame body 21, and pulleys (not shown) around which a pair of wire ropes W, W passing through the frame body 21 are wound. The upper frame 30 receives the intermediate movable frame 20 lifted by the wire ropes W, W by the frame body 31, and suspends a pair of bucket shells 50, 50 from the frame body 21 by the four suspension arms 22.

[0017] As shown in FIG. 3, the lower frame 40 includes an hydraulic cylinder 60 at the center of a rectangular lower frame body 40a extending in the X direction and the Y direction in the figure, and also includes an oil tank (not shown), a control device (solenoid valve) for controlling the opening operation of the hydraulic cylinder 60, a battery for supplying power to the control device, a wireless receiver for remote operation, etc. As shown in FIG. 1, the hydraulic cylinder 60 mainly consists of a cylindrical cylinder body 61 attached to stand upright on the lower frame 40, a piston rod 62 that protrudes and retracts from the upper end of the cylinder body 61, and a hydraulic circuit (not shown).

[0018] Then, as described above, the upper end of the piston rod 62 of the hydraulic cylinder 60 is connected to the tower portion 21a of the intermediate movable frame 20, and the hydraulic cylinder 60 can be expanded and contracted in the vertical direction in synchronization with the vertical movement of the intermediate movable frame 20. When the hydraulic cylinder 60 contracts and rises toward the upper frame 30 together with the intermediate movable frame 20, as shown in FIG. 2, the bucket shells 50, 50 are closed. When the hydraulic cylinder 60 extends from this state and the lower frame 40 descends, the bucket shells 50, 50 open as shown in FIG. 1.

[0019] As shown in FIGS. 1 and 2, the bucket shells 50, 50 are each in the shape of a container. The openings 52 of the shell bodies 51 face each other when closed, and face downward when open. The inner sides of the bucket shells 50, 50 are attached to the lower frame 40, and the outer sides are suspended from the upper frame 30 by four suspension arms 22, 22, 22, 22. That is, the outer surface portions 51a of the inner frames 51b, 51b of the shell body 51 are pivotally supported at the lower ends of the suspension arms 22, and the opening 52 sides of the inner frames 51b, 51b are pivotally supported at the shaft portion 41 of the lower frame 40.

[0020] Also, as shown in FIG. 3 (FIG. 3 is an enlarged view showing the S portion in FIG. 1), a pair of guard members 70, 70 are provided on each of the suspension arms 22, 22, 22, 22 that support the bucket shells 50, 50. The guard member 70 is composed of, for example, a long metal member with a length of about 1.5 to 2.0 m, and is provided along the longitudinal direction of the suspension arm 22 as shown in FIG. 3.

[0021] More specifically, as shown in FIGS. 4 to 6, the guard member 70 is composed of, for example, a base plate 71 made of metal (steel plate) in the shape of a strip with a width of about 50 mm, a plate thickness of about 5 mm, and a length of about 1.5 to 2.0 m, and a guard plate 72 that rises substantially at a right angle from the edge of the base plate 71. The material and size of the guard plate 72 are substantially the same as those of the base plate 71.

[0022] The base plate 71 is formed with a plurality of through holes 71a at a predetermined interval. In the present embodiment, five through holes 71a are formed in the base plate 71. On the other hand, both ends of the guard plate 72 are tapered p, p. FIGS. 7 and 8 show the mounting state of this guard member 70. FIG. 7 is an enlarged view showing the S portion in FIG. 3, and FIG. 8 is an axial cross-sectional view showing the mounting state of the guard member 70 with respect to the suspension arm 22.

[0023] As shown in the figure, the suspension arm 22 is made of a metal plate material having a rectangular cross-section, and has four side surfaces f1, f2, f3, f4 respectively. And among these four side surfaces f1, f2, f3, f4, guard members 70 are respectively attached along their longitudinal directions to the two side surfaces f2, f3 located outside when viewed from the central hydraulic cylinder 60.

[0024] Specifically, as shown in FIG. 8, after the base plate 71 side is brought into contact with the side surfaces f2, f3 of the suspension arm 22, the through holes 71a are aligned with screw holes 22b previously formed in the side surfaces f2, f3, and bolts 80 serving as fastening means are inserted together with washers 81 into the through holes 71a and screwed into the screw holes 22b. Thereby, the guard member 70 can be reliably attached to the side surfaces f2, f3 of the suspension arm 22 respectively. Similarly, the guard member 70 can be attached to the remaining other suspension arms 22 by the same procedure.

[0025] The grab bucket 100 of the present invention configured as described above has each suspension arm 22 protected by the guard member 70. Therefore, even if the suspension arm 22 hits the hatch coaming of the ship or other structures during the handling operation, the suspension arm 22 will not be damaged. Further, when the suspension arm 22 hits the hatch coaming of the ship or other structures, the guard plate 72 portion of the guard member 70 will hit preferentially. Therefore, when the impact of the collision is large, the guard plate 72 is appropriately deformed to relieve the impact on the suspension arm 22, so that damage to the suspension arm 22 can be effectively prevented.

[0026] In addition, since the end of the guard plate 72 is tapered and there is no sharp corner at the end, when the guard plate 72 hits the hatch coaming of the ship or other structures, it is possible to avoid severely damaging or breaking them. Further, since this guard member 70 is detachably attached to the suspension arm 22 by fastening means such as bolts 80, if the existing guard member 70 is damaged, the guard member 70 can be easily detached and replaced with a new guard member 70 simply by fastening or removing the bolts 80.

[0027] Note that in this embodiment, an example of attaching a guard member to the suspension arm of a single-wire wireless cylinder type grab bucket is shown. However, this guard member can be applied regardless of the type as long as it is not only a single-wire wireless cylinder type grab bucket but also other grab buckets having a suspension arm with a similar structure. Further, in this embodiment, tapering p, p is applied to both ends of the guard plate 72, but only one of them may be sufficient, and chamfering may be used instead of the tapering p, p.

Explanation of Reference Numerals

[0028] 100…grab bucket 22…suspension arm 22b…threaded hole 70…guard member 71…Base plate 71a…Through hole 72…Guard plate 80…Bolt 81…Washer f1~f4…Side surface p…Taper processing

Claims

1. In a grab bucket in which a bucket shell is supported by multiple hanging arms on a suspendable frame, A grab bucket characterized in that the hoisting arm is provided with a guard member extending in the longitudinal direction of the hoisting arm.

2. The grab bucket according to claim 1, The guard member includes a base plate attached to a surface of the suspension arm; and a guard plate rising from the base plate.

3. The grab bucket according to claim 2, A grab bucket characterized in that one or both ends of the guard plate are tapered or chamfered.

4. The grab bucket according to claim 2, The grab bucket is characterized in that the guard member is detachably attached to the surface of the suspension arm by a fastening means.

5. The grab bucket according to claim 3, The grab bucket is characterized in that the fastening means comprises a through hole of the base plate, a screw hole on the suspension arm side, and a bolt that screws from the through hole of the base plate into the screw hole on the suspension arm side.

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