JP5460498B2 - Grab bucket - Google Patents

Description

  The present invention relates to a grab bucket for dredging, and more specifically, dredging with dredging excavation force improved by flattening a dredging excavation site by closing the grab bucket flat in dredging work on a bay, river or lake. It is about the grab bucket.

  Conventionally, as shown in FIG. 7, the dredging grab bucket has a structure in which left and right arms 23 and 24 are mounted on an upper support member 22 suspended from an end of a suspension wire 21 fed out from a wire drum in a hoist of a dredger. Are pivotally connected to the upper support shafts 22a and 22b by pin connection, and pin-coupled bucket support shafts 25 are respectively provided at the lower ends of the arms 23 and 24, and the bucket support shafts 25 are connected to the buckets 26a and 26b. The rear end is connected. The upper portions of the buckets 26a and 26b are connected to a connecting shaft 27, respectively. The connecting shaft 27 is provided at the lower end of the lower support member 28, and the lower support member 28 is suspended by an opening / closing wire 29 of the dredger.

  Using such a grab bucket 26, the upper support member 22 is fixed in the vertical direction with the suspension wire 21, and the lower support member 28 is lifted by winding up the opening and closing wire 29, whereby the bucket 26a, Excavation is performed by rotating 26b around the connecting shaft 27. Then, the trajectory of the blade edge of the bucket is as shown in FIG. 9 until the grab bucket 26 is closed as shown in FIG.

  The grab bucket 26 is 4.5 m (× 2 = 9.0 m) in the horizontal direction (X axis) in the open state with the Y axis in FIG. 8 as the center line, and the change width of the trajectory in the vertical direction of the cutting edge is X 0.75 m + 0.2 m = 0.95 m with respect to the axis. In this way, the locus of the cutting edge is not flat, irregularities are created after excavation, the amount of excavated soil increases, and it is also costly to level the irregularities and secure land to dispose of the excavated soil amount There's a problem.

  Therefore, as a method of controlling the position of the blade edge horizontally by winch control so as not to generate an excessive amount of excavation, a bucket lift position detector, a support rope feed detector, a bucket blade height movement calculator, a bucket opening degree There is known a horizontal excavation control device that controls the lifting operation of the lifting device by a detector, a subtractor, a target value setting device, a control device, etc. to move the blade tip of the grab bucket almost horizontally (Patent Document) 1).

  The grab bucket horizontal excavation control device has a problem that the configuration of the device becomes complicated to constitute an automatic control device, and can only be applied to some dredgers, and the cost is drastically increased.

  Therefore, as shown in FIGS. 10 (A) and 10 (B), the applicant of the present invention is that the connection position in the left-right direction of one end of both the left and right arms 14 and 14 is the connection between a pair of left and right buckets 15a and 15b. The grab bucket 11 proposed to be located on a straight line passing through the shaft 17a and the blade edge 15d of the closed state of the buckets 15a and 15b.

  Then, as shown in FIG. 10 (C), in the open state, the horizontal width (X axis) is 4.5 m (× 2 = 9.0 m), and the vertical width of the cutting edge is limited to about 15 cm. It was a success.

JP 2002-128465 A

  However, since the condition of the shape of the blob bucket is fixed in order to perform horizontal excavation, the horizontal grabbing force (excavation force) of the grab becomes smaller than the conventional one. That is, as shown in FIGS. 11A and 11B, regarding the excavation force, the excavation force of the grab depends on the grab weight and the grab shape as long as the tension of the opening and closing rope is the same. And excavation force becomes so large that angle (theta) which AB and BC shown to FIG. 11 (A) and (B) make is large. Therefore, there is a problem that the excavation force of the horizontal grab 11 is smaller than that of the conventional non-horizontal excavation grab 20. The grab bucket according to the present invention has been proposed in order to solve such a problem.

The gist of the grab bucket according to the present invention is to solve the above-mentioned problems and achieve the object by supporting the upper support member and one end portion of the upper support member so as to be swingable while fixing the connection position to the upper support member. A pair of left and right opposing buckets constituting the grab bucket are suspended via both left and right arms whose other ends are swingably connected to the lower end of the bucket, and the pair of left and right opposing buckets are opened and closed. In order to have a connecting shaft that rotatably connects the upper parts of the pair of buckets,
The vertical position of the cutting edge of the pair of left and right buckets is a bucket capable of horizontal excavation in which the positions of the open state and the closed state of the bucket are in the same horizontal position,
Arm closing means for shifting the arms from the open state to the closed state at least around the connecting portion of the upper support member is provided,
The arm closing means has a configuration in which pulleys are provided in the middle of the left and right arms, and one end of an opening / closing rope that opens and closes the pair of buckets is extended from above the grab buckets and wound around the pair of pulleys. Turn, the other end of the opening and closing rope is attached to a part of the grab bucket,
The pair of pulleys are forcibly approached or separated from each other by raising and lowering the opening and closing rope, and the pair of buckets lifts and lowers the connecting shaft by raising and lowering the connecting shaft via the left and right arms. Opened and closed around the center,
The left and right arms cross each other in the X shape between positions in the vertical direction between the connecting shaft in the opened state of the bucket and the connecting portion at one end of the upper support member.
As another aspect of the present invention, the structure as the arm closing means is a hydraulic jack mounted horizontally across both arms.

  The other end portion of the opening / closing rope is wound around a pulley provided on the upper support member so that the opening / closing operation of the bucket is ensured by winding up the opening / closing wire, and then the portion of the connecting shaft of the bucket It is that it was attached to.

According to the grab bucket of the present invention, by forcibly closing both arms directly by the arm closing means, tension is applied to the blade edge of the bucket, and the bucket excavating force can be sufficiently obtained.
Further, since the arm closing means is closed by a pulley provided on both arms and an opening / closing wire wound around the arms, both arms are strongly attracted by the wire ring and closed, so that the excavation force of the bucket can be sufficiently obtained. Further, if one end of the opening / closing rope is connected to the connecting shaft, the bucket starts to close (trigger), so that the closing operation is ensured. Furthermore, the arm closing means can be similarly actuated by a hydraulic jack, and has a number of excellent effects such as a simple configuration.

It is the front view 8A) which concerns on the grab bucket 1 which concerns on this invention, and a side view (B). It is a schematic explanatory drawing explaining the state of the wire ring in the grab bucket 1 of the same invention. FIG. 4 is an intermediate view showing a state in which both arms 4 and 4 are closed by arm closing means in the grab bucket 1 of the present invention. They are the front view (A) and the side view (B) of the state which closed both arms 4 and 4 by the arm closing means in the grab bucket 1 of the same invention. It is a front view of the grab bucket 1a which concerns on 4th Example of this invention. In the grab bucket 1a which concerns on the 4th Example, it is explanatory drawing which shows that the position of the up-down direction of the blade edge | tip in an open state and a closed state does not change. It is a front view of the grab bucket 20 which concerns on a prior art example. It is explanatory drawing which shows the opening-and-closing state of the grab bucket 20 in order. It is a figure which shows the locus | trajectory of the blade edge | tip of the grab bucket. In the same grab bucket 11, the explanatory views (A) and (B) showing that the vertical position of the cutting edge in the open state and the closed state does not change and the vertical direction when shifting to the opening and closing of the grab bucket 11 It is a locus diagram (C) which shows the position change of. It is comparison figure (A) for comparing angle (theta) concerning the excavation force of grab buckets 11 and 20, (B).

  As shown in FIG. 1, the grab bucket 1 according to the present invention is configured to close the buckets 5 a and 5 b while exerting a large excavation force by forcibly closing them through both arms 4 and 4. .

The structure of the grab bucket 1 will be described in the case of the wiring embodiment. The support wire 2 is connected to the upper support member 3 and the upper support member 3 at one end 4a so as to be swingable while fixing the connection position. A pair of left and right opposing buckets 5a and 5b constituting a grab bucket are suspended via both left and right arms 4 and 4 that are swingably connected to the lower ends of the buckets 5a and 5b. The connecting positions in the left-right direction of the one end portions 4a of the left and right arms 4 are respectively located on straight lines passing through the connecting shaft 7a of the pair of left and right opposing buckets 5a, 5b and the blade edge 5d of the closed state of the buckets 5a, 5b. In order to open and close the pair of left and right buckets 5a and 5b, there is a connecting shaft 7a that rotatably connects the upper portions of the pair of buckets 5a and 5b.

  Arm closing means is provided for moving the arms 4, 4 from the open state to the closed state at least around the connecting portion 3 a of the upper support member 3. That is, a closing means is required to shift both arms 4 and 4 from the open state to the closed state. Conversely, in order to shift both arms 4 and 4 from the closed state to the open state, the drive means is particularly required. It is not necessary, and it returns to the open state via a link mechanically connected by its own weight by releasing the action of the closing means.

  The pair of buckets 5a and 5b are closed around the connecting shaft 7a via the arms 4 and 4 which are closed by the arm closing means.

  As the first embodiment, as the arm closing means, as shown in FIGS. 1 and 2, a pulley (sheave block) 8 is provided in the middle of the left and right arms 4 and 4 in the vertical direction.

One end of an opening / closing wire 6 for opening and closing the pair of buckets 5a and 5b is extended from above the grab bucket 1 and along the pulley 9a of the sheave block 9 in the upper support member 3, and further the pair of pulleys 8, 8, the other end 6 a of the opening / closing wire 6 is connected to a part of the grab bucket 1.

  As shown in FIG. 2, the pair of pulleys (sheave blocks) 8 and 8 are arranged with a plurality of pulleys 8a and 8c on one side and a plurality of pulleys 8b and 8d on the other side as an example. Then, the opening / closing wire 6 is wound from one end 6a in the order of a pulley 8d → a pulley 8c → a pulley 8b → a pulley 8a → a pulley 9a. In this case, the method of winding the opening / closing rope around the pulley is only required to be wound in a range of a necessary angle, and does not mean that it is necessary to wind around 360 ° or more around one pulley.

  Further, the pulley (sheave block) 8 may be arranged with a pair of pulleys. As shown in FIG. 1B, the pair of pulleys (sheave blocks) 8 and 8 may be provided in two sets at both ends in the front-rear direction, or in a larger number of sets. One opening / closing wire 6 is provided for each pair of pulleys (sheave blocks) 8, 8, but each pair of pulleys (sheave blocks) 8, 8 is communicated with each other. One open / close wire 6 may be used.

  The pair of pulleys 8 and 8 are forcibly approached with a large force by raising and lowering the opening and closing wire 6, or can be separated by loosening the opening and closing wire 6. Is opened and closed. By such arm closing means, the pair of buckets 5a and 5b are closed around the connecting shaft 7a via the arms 4 and 4 to be closed.

  In order to open the buckets 5a and 5b, when the tension of the opening and closing wire 6 is relaxed, the connection shaft 7a is lowered by the weight of the buckets 5a and 5b, and the buckets 5a and 5b are expanded. is there. The open state becomes the state shown in FIG.

  According to the grab bucket 1 according to the present invention configured as described above, when the opening / closing wire 6 is wound up from the open state of the bucket shown in FIG. 1, the upper support member pulley 9 a to pulley 8 a to pulley 8 d to pulley. 9b is tensioned and pulled, the force is doubled by the action of the pulley, and the pair of pulleys 8 and 8 are attracted by a strong force. Then, as shown in FIG. 3, the arms 4 and 4 are attracted to each other, whereby the buckets 5a and 5b are also rotated about the connecting shaft 7a and gradually closed. Finally, as shown in FIGS. 4A and 4B, the blade edges 5d of the buckets 5a and 5b come into contact with each other to be in a closed state. Since the buckets 5a and 5b are forcibly closed by the arms 4 and 4, the excavation force by the cutting edge 5d is strong, and a sufficient excavation force is exhibited as a horizontal grab bucket.

  In order to open the closed buckets 5a and 5b, the open / close wire 6 is relaxed from the state shown in FIG. Then, from the state in which the upper portions of the buckets 5a and 5b are raised, the connecting shaft 7a is lowered by its own weight, the blade edges 5d and 5d are separated from each other, and the buckets 5a and 5b are opened, and the state shown in FIG. become.

In the above embodiment, the other end 6a of the opening / closing wire 6 is connected to a part of the grab bucket 1, but it is wound around the pulley 9b provided on the upper support member 3 and then the grab The bucket 1 is connected to the connecting shaft 7a. As a result, when the opening / closing wire 6 is wound up from the open state shown in FIG. 1, the connecting shaft 7a is pulled up, which triggers the closing of the buckets 5a and 5b. That is, the bucket closing operation is ensured.

  The structure as the arm closing means can be a hydraulic jack (not shown) mounted horizontally between the arms 4 and 4 in addition to the above-described wire ring. According to this, a structure is simple and it can comprise easily at low cost.

  The structure of the grab bucket 1a shown in FIGS. 5 to 6 is such that the left and right arms 4 and 4 are vertically connected to the connecting shaft 7a in the opened state of the buckets 5a and 5b and the connecting portion of the arm one end 4a in the upper support member 3. The arms 4 and 4 intersect each other in the X shape between the position a in the direction. The left and right crossing positions of the arms 4 and 4 are respectively located on straight lines passing through the connecting shaft 7a of the pair of left and right buckets 5a and 5b and the closed cutting edge 5d of the buckets 5a and 5b. ing. A pulley (sheave block) 8 is provided in the middle of the left and right arms 4 and 4 in the vertical direction as arm opening / closing means.

  Similarly to the grab bucket 1, the opening / closing wire 6 is wound around the pulley 8 and the sheave block 9 of the upper support member 3. As shown in FIG. 6A, the left and right pulleys 8 are drawn by winding up the opening / closing wire 6, and at the same time, the arms 4 and 4 are drawn together, whereby the buckets 5a and 5b are also connected to the connecting shaft 7a. Rotate around the center and close gradually. Finally, as shown in FIG. 6B, the blade edges 5d of the buckets 5a and 5b come into contact with each other to be in a closed state. In this manner, the blade edges 5d of the buckets 5a and 5b are moved substantially horizontally and are forcibly closed with force by the arm closing means.

  The grab bucket 1 according to the present invention is not limited to an arm that opens and closes a bucket, but contributes to the opening and closing of an arm that is applied to a member that moves horizontally.

1 grab bucket,
2 Supporting wire,
3 upper support member, 3a bearing part,
4 arms, 4a one end,
5a bucket, 5b bucket,
6 Opening and closing wire, 6a end,
7 Lower support member, 7a Connecting shaft,
8 pulley (sheave block),
8a-8d pulley,
9 Sheave block
9a, 9b pulley,
11 Grab bucket according to conventional example, 11a Grab bucket,
12 Support wire,
13 Upper support member,
14 arm, 14a one end,
14b the other end,
15 grab bucket, 15a, 5b bucket,
15c upper part, 15d cutting edge,
16 Opening and closing wire,
17 lower support member, 17a connecting shaft,
20 Grab bucket according to the conventional example,
21 Hanging wire,
22 Upper support member,
23, 24 arms,
25 bucket spindle,
26 Grab bucket,
26a, 26b bucket,
27 connecting shaft,
28 Lower support member,
29 Opening and closing wire.

Claims (3)

The upper support member and the left and right arms having the other end connected to the lower end of the bucket in a swingable manner while the upper support member is fixed to the upper support member by a support wire and the connection position is fixed. A grab grab having a connecting shaft that suspends a pair of left and right opposing buckets constituting the grab bucket and rotatably connects the upper portions of the pair of buckets to open and close the pair of left and right opposing buckets In the bucket
The vertical position of the cutting edge of the pair of left and right buckets is a bucket capable of horizontal excavation in which the positions of the open state and the closed state of the bucket are in the same horizontal position,
Arm closing means for shifting the arms from the open state to the closed state at least around the connecting portion of the upper support member is provided,
The arm closing means has a configuration in which pulleys are provided in the middle of the left and right arms, and one end of an opening / closing rope that opens and closes the pair of buckets is extended from above the grab buckets and wound around the pair of pulleys. Turn, the other end of the opening and closing rope is attached to a part of the grab bucket,
The pair of pulleys are forcibly approached or separated from each other by raising and lowering the opening and closing rope, and the pair of buckets lifts and lowers the connecting shaft by raising and lowering the connecting shaft via the left and right arms. Opened and closed in the center,
The left and right arms cross each other in an X-shape between the connecting shaft in the open state of the bucket and the vertical position of the connecting portion at one end of the upper support member,
Grab bucket that features. The other end of the opening / closing rope is wound around the pulley provided on the upper support member to ensure the opening / closing operation of the bucket by winding up the opening / closing wire, and then to the connecting shaft portion of the bucket. Connected,
The grab bucket according to claim 1. The upper support member and the left and right arms having the other end connected to the lower end of the bucket in a swingable manner while the upper support member is fixed to the upper support member by a support wire and the connection position is fixed. A grab grab having a connecting shaft that suspends a pair of left and right opposing buckets constituting the grab bucket and rotatably connects the upper portions of the pair of buckets to open and close the pair of left and right opposing buckets In the bucket
The vertical position of the cutting edge of the pair of left and right buckets is a bucket capable of horizontal excavation in which the positions of the open state and the closed state of the bucket are in the same horizontal position,
Arm closing means for shifting the arms from the open state to the closed state at least around the connecting portion of the upper support member is provided,
The configuration as the arm closing means is a hydraulic jack mounted horizontally between both arms ,
The left and right arms cross each other in an X-shape between the connecting shaft in the open state of the bucket and the vertical position of the connecting portion at one end of the upper support member,
Grab bucket that features.

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