JPH08291534A - Clamshell bucket - Google Patents

Abstract

PURPOSE: To open and close an excavating bucket by functioning a driving cylinder as a driving source to drive an opening and closing cylinder by a hydaulic circuit part with the lowering and elevating motion. CONSTITUTION: A pair of right and left excavating buckets 11 are suspended from a crane machine 1 and can be opened and closed. A support member 7 is disposed on a suspension member 6 in such a manner as to freely slide vertically, and a driving cylinder is installed between the suspension member and the support member. A pair of right and left opening and closing cylinders are installed between a support shaft and a support member 7, and a hydraulic circuit part for hydraulic connecting the driving cylinder and the opening and closing cylinder to each other is disposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamshell bucket which is suspended from a boom of a crane machine such as a tower crane and is used for a deep hole excavation work.

[0002]

2. Description of the Related Art Conventionally, as this type of clamshell bucket, a pair of right and left excavating buckets that are suspended by a suspending wire of a crane machine and can be opened and closed are provided, and the excavating bucket is lifted by unwinding and unwinding the suspending wire. It is equipped with a structure for performing the excavation work by lowering and opening and closing the excavation bucket by another opening and closing wire, and with the turning operation of the crane machine, and a hydraulic pump that generates pressure oil using a motor as a drive source. Therefore, there is known a structure in which this pressure oil is switched and fed to a hydraulic cylinder to open and close the excavation bucket.

[0003]

However, in the case of the above-mentioned conventional structure, in the former structure, since two wires are required, two wires are operated and the operability is likely to deteriorate, and moreover, the winding operation is difficult. Since two drums are required, it cannot be used, for example, in a crane machine or the like having only one take-up drum. In the latter structure, a hydraulic power source is required, so a hydraulic excavator excavator is required. However, the hydraulic hose may be entangled with the suspension wire and the extension of the excavation depth may be limited by the hydraulic hose.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve such inconvenience, and the gist of the present invention comprises a pair of left and right excavating buckets suspended from a crane machine and capable of opening and closing. A support member is vertically slidably disposed on a suspension member suspended from the machine, a drive cylinder is installed between the suspension member and the support member, and the pair of left and right excavation buckets are supported by a fulcrum shaft. A pair of left and right opening / closing cylinders are rotatably pivotably mounted between the fulcrum shaft and the supporting member, and a left and right pair is provided between the outer ends of the pair of excavation buckets and the supporting member. In the clamshell bucket, the support link is installed, and a hydraulic circuit section for hydraulically connecting the driving cylinder and the opening / closing cylinder is arranged.

At this time, it is desirable to dispose a weight body on the fulcrum shaft.

[0006]

[Operation] The crane machine causes the hanging member to perform a hoisting and lowering operation and a turning operation. With the hoisting and hoisting operation, the hydraulic circuit section drives the opening and closing cylinders as a drive source, and the excavation bucket is It will open and close.

Further, at this time, by disposing the weight body on the fulcrum shaft, the extension operation of the opening / closing cylinder is promoted,
The opening operation of the excavation bucket is smoothly performed.

[0008]

1 to 17 show an embodiment of the present invention.
Is a crane machine. In this case, a boom 3 that can be horizontally swung and raised / lowered is mounted on a machine base 2, and a hanging wire 5 that can be hoisted and unwound by a take-up drum 4 is hung from the tip of the boom 3. Is configured.

Reference numeral 6 denotes a suspension member, which in this case is formed in the shape of a square pipe and has a wire connection portion 6a which is connected to the suspension wire 5 from the crane machine 1.

Reference numeral 7 is a support member, and in this case, it is formed in the shape of a square pipe that can be fitted onto the outer surface of the suspension member 6 so as to be vertically slidable.

Reference numeral 8 denotes a driving cylinder, in which case a rod portion 8a is pivotally connected to an upper connecting portion 6b formed on the upper wall of the hanging member 6 by a connecting pin 9, and the lower inner surface of the supporting member 7 is connected. The cylinder portion 8b is pivotally connected to the lower connecting portion 6c formed by the connecting pin 10 so that the driving cylinder 8 is installed between the suspending member 6 and the supporting member 7.

Numerals 11 and 11 denote excavation buckets, which are formed by fan-shaped side plates 11a and a peripheral plate 11b. The left and right excavation buckets 11 and 11 are arranged on the inner side of the center of both side plates 11a. A fulcrum shaft 12 is pivotally connected so as to open and close freely.

Reference numerals 13 and 13 denote open / close cylinders. In this case, the cylinder portion 13a is pivotally connected to the fulcrum shaft 12, and the rod portions 13b are provided on both outer surfaces of the support member 7 so as to project therefrom. Pivotally connected to the fulcrum shaft 1
2 a pair of left and right opening / closing cylinders 13 between the support member 7 and
・ 13 are installed.

Reference numerals 15 and 15 are support links. In this case, upper link shafts 17 are laterally provided by bearing plates 16 on both outer side surfaces of the support member 7, and the lower ends are provided at the outer ends of the respective excavation buckets 11 and 11. The link shaft 18 is provided laterally, and the support links 15 and 15 are pivotally mounted between the upper link shaft 17 and the lower link shaft 18, respectively, and the support links 15 and 15 are provided on both outer surfaces of the support member 7.
The contact plate 7a that can come into contact with the cross plate 15a is formed by projecting.

Reference numeral 19 denotes a hydraulic circuit portion, which is configured to hydraulically connect the drive cylinder 8 and the pair of left and right opening / closing cylinders 13, 13.

In this case, the hydraulic circuit section 19 is, as shown in FIG. 8, a switching valve 2 for closing, which includes four ports, three positions, an open center, a spring center, and an electromagnetic pilot switching valve.
0, a check valve 21, a check valve 22 with a throttle valve, a switching valve 23 for opening, which includes four ports, two positions, a spring offset, and a manual switching valve, and a throttle valve 24. The opening / closing cylinders 13 are hydraulically connected to each other, the non-connection port of the closing switching valve 20 is closed by a plug, the opening switching valve 23 is attached to the upper surface of the hanging member 6, and the operation cord 23a is pulled downward. It is configured to be switched by.

Reference numeral 25 denotes a weight body, which is attached on the axis of the fulcrum shaft 12.

Since this embodiment has the above structure, the hanging wire 5 from the winding drum 4 mounted on the crane machine 1 is used.
Is connected to the suspension member 6, and in the lowered state of FIGS. 8 and 9, the drive cylinder 8 is in the contracting operation state and the left and right opening / closing cylinders 13 are in the extending operation state. When the suspension wire 5 is wound up with, the supporting member 7 and the excavation buckets 11 and 11 remain by their own weight, and only the suspension member 6 slides upward, and the upward sliding motion of the suspension member 6 extends the drive cylinder 8. Therefore, the extension operation of the drive cylinder 8 causes the drive cylinder 8 to move from the rod side of the cylinder portion 8b to the rod side of the cylinder portion 13a of the opening / closing cylinder 13 via the neutral position of the closing movement switching valve 20 and the opening movement switching valve 23. Pressure oil flows in, and the pressure oil causes the opening / closing cylinder 13 to contract, whereby the excavation bucket 1 is gradually
1, 11 are closed around the fulcrum shaft 12 to perform the excavation work of the soil W in the excavated portion K to be in the states shown in FIGS. 10 and 11, and the hanging member 6 is further lifted by further winding of the hanging wire 5. When the suspension is lifted and raised, as shown in FIGS. 12 and 13, the entire suspension is lifted and swung by the crane machine 1 in the lifted state, and the switching valve for opening 23 is operated at the predetermined position.
When the switching operation is performed by the pulling movement of 3a, the switching valve 20 for closing is switched by the pilot differential pressure and the internal pressure on the rod side of the cylinder portion 13a of the opening / closing cylinder 13 is released as shown in FIGS. Bucket 11
11 indicates that the earth moving operation is performed around the fulcrum shaft 12 to perform the earth unloading work. After earth unloading, as shown in FIGS.
The operating string 23a is released, and in this state, the crane machine 1 again swivels to position the excavation bucket 11.11 to face the excavation portion K, loosen the hanging wire 5, and lower the entire excavation bucket 11. 11 contacts the excavated portion K,
Due to further lowering, the switching valve for opening 23 performs a return switching operation,
Only the hanging member 6 descends while sliding on the supporting member 7, whereby the driving cylinder 8 contracts and returns to the state of FIGS. 8 and 9, and excavation work is performed by repeating these operations. Will be seen.

Therefore, the hanging member 5 is moved by the crane machine 1.
Is suspended and lifted and swung, and the hydraulic circuit unit 19 drives the drive cylinder 8 along with the suspended lift and lower operation.
Is used as a driving source to drive the opening / closing cylinder 13 to open / close the excavation buckets 11 and 11. Therefore, excavation workability can be improved, and one hanging wire and one unit can be used. Not only can it be applied to crane machines that have only take-up drums, it can also be used in crane machines that do not have a hydraulic power source, and the versatility and versatility can be expanded as much and the suspension wire Entanglement can be suppressed, and the extension of the excavation depth can be expected accordingly.

At this time, the weight 25 is attached to the fulcrum shaft 12.
Since the opening and closing cylinders 13 and 13 are extended, the extension operation of the opening and closing cylinders 13 and 13 is facilitated, so that the opening operation of the excavation buckets 11 and 11 can be smoothly performed, and the workability can be improved accordingly.

The present invention is not limited to the above embodiment, and the structures of the suspension member 6 and the support member 7, the structure of the hydraulic circuit portion 19 and the like are appropriately modified and designed.

[0022]

As described above, according to the present invention, a crane machine causes a suspension member to perform a lifting / lowering operation and a swinging operation, and a hydraulic cylinder serves as a drive source to open and close the suspension member as the lifting / lowering operation is performed. The driving cylinder can be driven to open and close the excavation bucket, which improves excavation workability, and can be applied to crane machines that have only one hanging wire and one take-up drum. It can be applied and can also be used for crane machines that do not have a hydraulic source, so versatility and flexibility can be expanded and entanglement of the hanging wire can be suppressed, and the extension of the excavation depth Can be expected.

At this time, by disposing the weight body on the fulcrum shaft, the extension operation of the opening / closing cylinder is promoted, so that the opening operation of the excavation bucket can be smoothly performed, and the workability is improved accordingly. You can

As described above, the intended purpose can be sufficiently achieved.

[Brief description of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is a partial front view of the embodiment shown in FIG.

FIG. 3 is a partial side view of the embodiment shown in FIG.

FIG. 4 is a partial front sectional view of the embodiment shown in FIG.

5 is a partial plan sectional view of the embodiment shown in FIG. 1. FIG.

FIG. 6 is a partial plan sectional view of the embodiment shown in FIG.

FIG. 7 is a partial front view of the embodiment shown in FIG.

FIG. 8 is an explanatory diagram of an operating state of the embodiment shown in FIG.

9 is a hydraulic circuit diagram of the embodiment shown in FIG. 1. FIG.

FIG. 10 is an explanatory diagram of an operating state of the embodiment shown in FIG.

FIG. 11 is a hydraulic circuit diagram of the embodiment shown in FIG.

FIG. 12 is an explanatory diagram of an operating state of the embodiment shown in FIG.

FIG. 13 is a hydraulic circuit diagram of the embodiment shown in FIG.

FIG. 14 is an explanatory diagram of an operating state of the embodiment shown in FIG.

FIG. 15 is a hydraulic circuit diagram of the embodiment shown in FIG.

16 is an explanatory diagram of an operating state of the embodiment shown in FIG.

FIG. 17 is a hydraulic circuit diagram of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane machine 6 Suspension member 7 Support member 8 Drive cylinder 11 Excavation bucket 12 Support shaft 13 Opening / closing cylinder 19 Hydraulic circuit section 25 Weight body

Claims (2)

[Claims] 1. A pair of right and left excavating buckets which are suspended from a crane machine and which can be opened and closed. A support member is vertically slidably disposed on a suspension member suspended from the crane machine. A driving cylinder is installed between the suspension member and the support member, and the pair of left and right excavation buckets are pivotally mounted by a fulcrum shaft so that they can be opened and closed. Hydraulic circuit section for erection of a driving cylinder and an erection of a pair of left and right support links between the outer ends of the pair of excavation buckets and the support member for hydraulically connecting the drive cylinder and the opening / closing cylinder. A clamshell bucket characterized by being configured by disposing. 2. The clamshell bucket according to claim 1, wherein a weight body is arranged on the fulcrum shaft.