JP3031409U - Grab bucket - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve a grab bucket so that wear of an opening / closing rope and a sheave can be reduced as much as possible. SOLUTION: The upper frame 5 is connected by a suspension rope,
Opening and closing rope 8 on upper frame 5 and upper sheave block 17
A sheave 6 supported by an upper sheave shaft 12 which is rotatably supported by
Also, in a grab bucket in which the shell portions 1, 1 can be opened and closed by being hung between sheaves 7 supported by a lower sheave shaft 14 pivotally supported by a lower frame 2 via a sheave block 16, the lower sheave shafts are provided with two sheave blocks. 16, 1
7 is divided into shafts 14 and 15 that are respectively supported by the shaft 7, and each supports four sheaves 7, and the shafts 14 and 15 are
Was arranged so as to intersect the upper sheave shaft 12 at a predetermined angle.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a grab bucket, and in particular, by using two sheave shafts of a lower sheave block of a grab bucket used for various operations such as dredging work, the sheave wear and the wire rope wear are reduced to reduce the sheave. The life of both wire rope and wire rope is extended to improve durability.

[0002]

[Prior art]

 In FIG. 7 showing a front view of a conventional grab bucket and FIG. 8 showing a side view thereof, reference numerals 1 and 1 denote a pair of left and right shell portions, 2 denotes a lower frame, 5 denotes an upper frame, and 4 and 4. Is a tie rod. The shell parts 1, 1 are rotatably supported by a lower frame 2 via a shaft 3, and the lower ends of the left and right tie rods 4, 4 are rotated by the shell parts 1, 1, and the upper end thereof is rotated by the upper frame 5. It is rotatably supported. A predetermined number of sheaves 7 and 6 are rotatably supported on the lower frame 2 and the upper frame 5 via a lower sheave block 16 and an upper sheave block 17, respectively, and the sheaves 6 and 7 are symmetrical to each other. The two opening and closing ropes 8 and 8 are hung around, and the shell parts 1 and 1 are opened and closed.

The open / close ropes 8 and 8 extend upward through guide rollers 9 and 9 arranged on the upper surface of the upper frame 5, and are suspended and supported by a crane (not shown) such as a dredger. On the upper surface of the upper frame 5, two suspension ropes (not shown) for suspending and lifting the entire dredging bucket from the crane are connected to the upper frame 5 via suspension rings 11.

As shown in FIG. 11, the sheaves 6 and 7 are composed of, for example, six sheaves 6 of the upper frame 5 and eight sheaves 7 of the lower frame 2. As shown in FIGS. 9 and 10, the sheave 6 is supported by the upper frame 5 via an upper sheave block 17 by one upper sheave shaft 12, and the sheave 7 is also supported by one lower sheave shaft 13. The lower frame 2 is supported by the lower sheave block 16.

Further, as shown in FIG. 11, the opening and closing ropes 8 and 8 hanging down from the central portions of the sheaves 6 and 7 are sequentially advanced from bottom to top toward both ends of the upper sheave shaft 12 and the lower sheave shaft 13. It was hung around the sheaves 6 and 7, and their ends were fixed to the upper frame 5. As shown in FIG. 10, the lower sheave shaft 13 is rotatably supported by a bearing 20 (bearing) fixed to the sheave partition wall 19 of the lower sheave block 16.

As shown in FIG. 12, the upper sheave shaft 12 and the lower sheave shaft 13 are arranged so as to intersect each other at a predetermined angle θ for the convenience of the mechanism and the wiring. , 7 are displaced from each other in the vertical position.

[0007]

[Problems to be solved by the device]

 However, according to the above-mentioned conventional grab bucket, the upper sheave shaft 12 and the lower sheave shaft 13 intersect each other at a predetermined angle θ, and the sheaves 6 and 7 are not always located on the same plane vertically. Since the positional deviation increases as the distance from the intersection center C shown in FIG. 12 increases, when the opening / closing rope 8 is wound around the sheaves 6 and 7 to operate, the opening / closing rope 8 is attached to the sheave groove walls of the sheaves 6 and 7. As a result of the one-sided contact, abrasion of the opening / closing rope 8 and the groove walls of the sheaves 6 and 7 was likely to occur.

Therefore, the opening / closing rope 8 and the sheaves 6 and 7 need to be inspected at regular intervals of use and replaced if the degree of wear is large. Then, the work of removing the sheaves 6 and 7 was required, and there was an inconvenience that the glove bucket could not be used during that period.

In view of the above circumstances, the present invention aims to improve the glove bucket so that the wear of the opening / closing rope and the sheave can be reduced as much as possible.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has a plurality of sheaves in which an upper frame is connected by a suspension rope and an opening / closing rope is supported by an upper sheave shaft pivotally supported by the upper frame through an upper sheave block, and a lower frame. In a grab bucket in which a shell part can be opened and closed by being hung between a plurality of sheaves supported by a lower sheave shaft supported by a lower sheave block, the lower sheave shaft is divided into two axes, and The glove bucket is arranged so that the two axes intersect with the above-mentioned upper sheave axis at a predetermined angle. Further, the lower sheave shaft is divided into two shafts, each supporting four sheaves, and means for arranging to intersect the upper sheave shaft at a predetermined angle is provided.

According to the above grab bucket, even though the angle at which the upper sheave shaft intersects with the lower sheave shaft is the same as before, the length of the intersecting shaft is shortened, so that the vertical sheave on the side away from the center of the intersection is reduced. Since there is less positional deviation, the wear of the open / close rope and sheave groove is reduced.

[0012]

[Embodiment of device]

 Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional example will be described using the same reference numerals. As shown in FIGS. 1 and 2, 1 and 1 are a pair of left and right shells, 2 is a lower frame, 5 is an upper frame, and 4 and 4 are tie rods. The shell parts 1, 1 are rotatably supported by the lower frame 2 via a shaft 3 and the lower ends of the left and right tie rods 4, 4 are rotated by the shell parts 1, 1, and the upper end thereof is rotated by the upper frame 5. It is rotatably supported. A plurality of sheaves 6 are rotatably supported on the upper frame 5 via upper sheave blocks 17, and a plurality of sheaves 7 are rotatably supported on the lower frame 2 via lower sheave blocks 16 and 18. It is supported. As shown in FIG. 2, two opening and closing ropes 8 and 8 are symmetrically wound around these sheaves 6 and 7 to open and close the shell parts 1 and 1.

The opening and closing ropes 8 and 8 extend upward through guide rollers 9 and 9 arranged on the upper surface of the upper frame 5, and are suspended and supported by a crane (not shown) such as a dredger. On the upper surface of the upper frame 5, two suspension ropes (not shown) for suspending and lifting the entire dredging bucket from the crane are connected to the upper frame 5 via suspension rings 11.

As shown in FIG. 5, the sheaves 6 and 7 are composed of, for example, six sheaves 6 on the upper frame 5 and eight sheaves 7 on the lower frame 2. As shown in FIG. 5, the sheave 6 is supported on the upper frame 5 by an upper sheave shaft 12 via an upper sheave block 17. Further, as shown in FIGS. 4 and 5, the sheave 7 is supported by the two lower sheave shafts 14 and 15 on the lower frame 2 via sheave blocks 16 and 18, respectively. Furthermore, as shown in FIG. 5, the above-mentioned open / close ropes 8 and 8 which hang down to the central portions of the sheaves 6 and 7 are hung down from the central portion of the sheave shaft 12 and distributed to the lower sheave shafts 14 and 15 so as to move upward The sheaves 6 and 7 are successively wound around, and their ends are fixed to the upper frame 5. As shown in FIG. 4, the lower sheave shafts 14 and 15 are rotatably supported by bearings 20 (bearings) fixed to the sheave partition walls 19 of the lower sheave blocks 16 and 18, respectively.

Here, the upper sheave shaft 12 is composed of one shaft, but the lower sheave shafts 14 and 15 are composed of two shafts, and four sheaves are arranged on each of them. The lower sheave shafts 14 and 15 are supported by the lower frame 2 at the same angle θ with respect to the upper sheave shaft 12 as the lower sheave shaft 13 in the conventional example. However, the axial length of the lower sheave shafts 14 and 15 becomes shorter. Therefore, as shown in FIG. 6, the positions of the opening and closing ropes 8, 8 that are hung between the upper and lower sheaves 6, 7 apart from the intersection C, C with the upper sheave shaft 12 are vertically different. Instead, the positions are closer to each other, and the deviation is reduced. Therefore, wear of the sheave groove and the opening / closing rope 8 during operation is reduced.

Since the lower sheave shafts 14 and 15 are biaxial, thrust load on the sheaves 6 and 7 is reduced, so that the life of the bearing 20 of the sheaves 6 and 7 is extended and durability is improved. . Further, since the pitch dimension of the opening / closing rope 8 can be reduced, the outside supporting pitch dimension can be reduced, so that the fleet angle on the crane side can be reduced, which also extends the life of the opening / closing rope 8.

[0017]

[Effect of device]

 According to the present invention described above, the lower sheave shaft is divided into two, the axial center lines are arranged at a predetermined angle with respect to the other, and the divided sheave shafts are respectively supported with a predetermined number of sheaves. Therefore, even if the number of sheaves increases, the displacement of the upper and lower sheaves on the outer side does not increase, the wear of the sheave groove and the open / close rope is reduced, the life is extended, and the durability is improved. That is, the wear of the sheave groove wall and the wire rope due to the increase in the displacement of the upper and lower sheaves becomes smaller as it goes outward.

Further, since the thrust load on the sheave is reduced, the life of the bearing of the sheave is extended and the durability is improved. Further, since the pitch dimension of the open / close rope can be reduced, the outer support pitch dimension can be reduced, so that the fleet angle on the crane side can be reduced, which also extends the life of the open / close rope. Therefore, the life of the glove bucket is extended and its durability is improved.

[Brief description of drawings]

FIG. 1 is a front view of a grab bucket according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic plan view of a lower frame.

FIG. 4 is a sectional plan view of a lower sheave shaft.

FIG. 5 is a wiring diagram of upper and lower sheaves.

FIG. 6 is a layout view of upper and lower sheave shafts.

FIG. 7 is a front view of a glove bucket showing a conventional example.

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a schematic plan view of a lower frame of a conventional example.

FIG. 10 is a cross-sectional plan view of a lower sheave shaft of a conventional example.

FIG. 11 is a wiring diagram of the conventional example to the upper and lower sheaves.

FIG. 12 is a layout view of upper and lower sheave shafts of a conventional example.

[Explanation of symbols]

 1 ... Shell part 2 ... Lower frame 5 ... Upper frame 6, 7 ... Sheave 8 ... Opening rope 10 ... Suspension rope 12 ... Upper sheave shaft 14, 15 ... Lower sheave shaft 16, 18 ... Lower sheave block 17 ... Upper sheave block

Claims (2)

[Scope of utility model registration request] 1. A plurality of sheaves in which an upper frame is connected by a suspension rope and an opening / closing rope is supported by an upper sheave shaft pivotally supported on the upper frame through an upper sheave block, and a lower sheave block is provided on a lower frame. In a grab bucket in which a shell portion can be opened and closed by being hung between a plurality of sheaves supported by a lower sheave shaft that is axially supported, the lower sheave shaft is divided into two shafts, and the two shafts are the upper sheave. A glove bucket characterized by being arranged so as to intersect the shaft at a predetermined angle. 2. Six sheaves which connect an upper frame with a suspension rope and which support an opening / closing rope with an upper sheave shaft pivotally supported by the upper frame through an upper sheave block, and a lower sheave block through a lower frame. In a grab bucket in which a shell portion can be opened and closed by being hung between eight sheaves supported by a lower sheave shaft that is pivotally supported, the lower sheave shaft is divided into two shafts and each supports four sheaves. At the same time, the glove bucket is arranged so as to intersect the upper sheave axis at a predetermined angle.