JPH09279623A - Grip device of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grip device which is mounted at the forward end of a boom of a construction machine, in which a single swinging action, in which only one of grip members opens or closes, or a double swinging action, in which both of the grip members simultaneously open or close, can be selectively effected in a simple manner. SOLUTION: A drive side grip member 1 and a driven side grip member 2 are provided, and the driven side grip member 2 is pivotally connected to the drive side grip member 1 through a connection link 11. The member 1 can be separated from the link 11 by pulling out a connection pin 8, and a fixing pin hole 14 is provided in a grip device frame 3 and the hole 14 is provided at such a location that when an end of the link 11 separated from a connection pin hole 8a is connected, the member 2 is held at a closed position. In the other construction, the link 11 can be removed and a fixing pin hole is provided in the frame 3 at a point where the member 2 comes to a closed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device for a construction machine, and more particularly, to a clamshell type bucket which is mounted in place of a bucket of a power shovel and an opening / closing drive device for a gripping claw.

[0002]

2. Description of the Related Art A bucket is usually attached to the tip of a boom of a power shovel, but when it is used for loading heavy objects or dismantling a building, the bucket is replaced by a clamshell type. Buckets and claws are attached.
The clamshell type bucket and the gripping claw are provided with two facing gripping members (bucket and fork), and the two gripping members synchronously swing in the closing direction or the opening direction to perform the gripping operation.

The synchronous opening / closing drive of the two gripping members is usually one.
This is done by a book hydraulic cylinder. In the case of a gripping claw device that does not perform swinging motion, many of the structures have a swinging cylinder that is attached to the boom of a power shovel to open and close the gripping claw, but in the case of a clamshell type bucket, Install a unit with a built-in hydraulic cylinder for opening and closing at the end of the boom. In any case, the gripping members such as the gripping claws and the buckets that face each other are connected to one hydraulic cylinder via a bifurcated link or the like,
It has a structure that is opened and closed synchronously.

The applicant of this application, as shown in FIG.
The drive side bucket 1 and the driven side bucket 2 are pivotally mounted around parallel fulcrum pins 4 and 5 provided on the bucket frame 3, and the rod of the bucket opening / closing cylinder 7 is connected to the tip of a bracket 6 extending from the drive side bucket 1. Then, the drive-side bucket 1 is oscillated and driven, and the drive-side bucket 1 and the tip of the bracket 9 extending from the driven-side bucket 2 are connected by the connection link 11, so that two hydraulic cylinders 7 grip each other. A structure for opening and closing the members 1 and 2 in synchronization is proposed. (Actual Kaihei No. 6-85447)

Also in the gripping pawl device, one of the gripping pawls (driving side gripping pawl) is rockably driven by the bucket rocking cylinder, and the swinging motion of the driving side gripping pawl is linked to the other gripping pawl (driven). A structure is known in which two opposing gripping claws are synchronously opened / closed by transmitting to the side gripping claw).

[0006]

In the conventional clamshell type bucket and gripping claw device, two facing buckets and gripping claws are synchronously opened and closed to perform a gripping operation. However, as the mechanization of earthmoving work and dismantling work progresses, it is desired to perform the gripping operation by swinging only one of the two gripping members, such as fixing one gripping member and closing the other. Requests are coming. The structure of opening and closing only one of the gripping members is simpler than the structure of opening and closing both of them synchronously, but a gripping device in which only one gripping member performs the opening and closing operation,
It is costly to prepare both a gripping device that performs a gripping operation by opening and closing both gripping members in synchronization.
It is necessary to replace the gripping device according to the work, and it takes time and labor to replace it, and the work efficiency is reduced.

Therefore, according to the present invention, a single opening type gripping operation in which only one of the facing gripping members is opened and closed to perform a gripping operation by one gripping device, and both gripping members are synchronously opened and closed to perform the gripping operation. An object of the present invention is to obtain a gripping device that can selectively perform a double-opening gripping operation and that can change the gripping operation by a simple operation.

[0008]

The gripping device of the present invention comprises:
The driving-side gripping member 1 and the driven-side gripping member 2 are pivotally mounted so as to be swingable around parallel fulcrum pins 4 and 5 provided on the gripping device frame 3, and the driving-side gripping member 1 is parallel to the fulcrum pins. The driving pin hole 13 and the connecting pin hole 8 are provided, the driven-side grip member 2 is provided with the driven pin hole 10, and the connecting pin hole 8 and the driven pin hole 10 are pivotally connected by the connecting link 11. And

The gripping device according to a first aspect of the present invention is provided with the above-mentioned premise structure, wherein the connecting pin hole 8 and the connecting link 11 can be separated by pulling out the connecting pin 8a, and the fixing pin is fixed to the holding device frame 3. A hole 14 is provided, and the fixed pin hole 14 is provided at a position where the driven side grip member 2 is held in the closed position when the ends of the connecting links separated from the connecting pin hole are connected.

A gripping device according to a second aspect of the present invention is a connecting link 1
1 and the driven pin 10a connecting the connecting link and the driven side gripping member are removable, and the gripping device frame 3 is provided with a fixing pin hole 10A. The fixing pin hole 10A is around the fulcrum pin 5. The driven-side gripping member 2 is provided at a closed position on the arc locus of the driven pin hole 10.

[0011]

In the gripping device of the present invention, the connecting pin hole 8
When the driven pin hole 10 and the driven pin hole 10 are connected by the connecting link 11, the drive side gripping member 1 is swung by the driving cylinder 7, so that the swinging operation is performed via the connecting link 11 by the driven side gripping member. 2 is transmitted to the driving side gripping member 1
And the driven side grip member 2 are opened and closed synchronously.

In the gripping device according to the first aspect of the present invention, the connecting pin 8a is pulled out to release the connection between the connecting link 11 and the driving side holding member 1, and the tip of the released connecting link is pulled out or separately. By connecting to the fixed pin hole 14 with the prepared pin, the driven side grip member 2 is fixed at the closed position. Therefore, if the drive cylinder 7 is expanded and contracted in this state, only the drive-side gripping member 1 is rockably driven with respect to the driven-side gripping member fixed at the closed position to perform the opening / closing operation.

Further, in the apparatus having the features of claim 2, the connecting link 11 and the driven pin 10a are removed, and the driven pin hole 10 is connected to the fixed pin hole 10A by the removed driven pin or a separately prepared pin. The driven side gripping member is fixed in its closed position. Therefore, if the drive cylinder 7 is expanded and contracted in this state, only the drive side gripping member 1 is rockably driven with respect to the driven side gripping member 2 in the closed position to perform the gripping operation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention and shows a clamshell bucket having the features described in claim 1. The bucket frame 3 is attached via a turning device 15 to an attachment frame 12 attached to the tip of a boom of a power shovel (not shown). A drive side bucket 1 and a driven side bucket 2 are pivotally attached to the bucket frame 3 via two fulcrum pins 4 and 5 provided in parallel. A drive bracket 6 and a connecting bracket 16 extend from the drive side bucket 1, and the tip of a rod of a drive cylinder 7 whose head end side is pivotally attached to the bucket frame 3 is driven in a drive pin hole 13 at the tip of the drive bracket 6. It is pivotally connected by a pin 13a. Two drive brackets 6 are provided in the central portion of the drive side bucket in the direction perpendicular to the plane of the drawing, and the drive cylinder 7
Is located inside the bucket frame 3.

A driven bracket 9 extends from the driven bucket 2. The driven pin hole 10 at the tip of the driven bracket and the connecting pin hole 8 at the tip of the connecting bracket 16 connect both ends of the connecting link 11. It is pivotally connected by a pin 8a and a driven pin 10a. Connecting bracket 1
The two 6 and the driven bracket 9 are provided at intervals in the direction perpendicular to the plane of the drawing, and the connecting link 1 for connecting them is provided.
One of the 1 is on the back side of the bucket frame 3 in the figure, and the other 1
The book is located on the front side of the figure.

On the other hand, a fixed bracket 17 is provided on the bucket frame 3, and a fixed pin hole 14 is provided at the tip of this fixed bracket. The fixing pin hole 14 has the same shape as the connecting pin hole 8 and is provided on the movement locus of the connecting pin 8a when the driven bucket 2 is fixed at the closed position and the connecting link 11 is swiveled around the driven pin 10a. ing. The connecting pin 8a can be axially pulled out from the connecting pin hole 8a and the fixed pin hole 14 due to a fitting tolerance. It is prevented by a removable member.

In the above structure, the connection pin is used for conversion between the double-open state in which the drive-side bucket 1 and the driven-side bucket 2 are connected by the connecting link 11 and the single-open state in which the driven-side bucket 2 is fixed at the closed position. 8a is pulled out in the axial direction so that the connecting position of the connecting link 11 is the connecting pin hole 8 and the fixing pin hole 1.
By converting between 4 and 4. FIG. 2 shows FIG.
In the clamshell bucket having the structure described in 1., it is possible to use the drive side bucket 1 as a shovel by removing the driven side bucket 2 and the connecting link 11.

FIG. 3 shows a second embodiment of the present invention, which is an example of a gripper device having the features of claim 2. The grip claw frame 3 is attached to the tip of the boom 18 of the power shovel so as not to swing, and the drive side grip claw 1 pivotally attached to one of the two fulcrum pins 4, 5 provided on the grip claw frame. A drive link 20 driven by a bucket swing cylinder (not shown) of a power shovel is connected to a drive pin hole 13 at the tip of a drive bracket 6 extending from the drive bracket 6. That is, the drive link 20 moves back and forth in the left-right direction in the figure to open and close the drive-side grip claw 1.

A connecting bracket 16 extends at the base end of the driving side gripping claw 1, and a connecting pin hole 8 at the tip of this connecting bracket and a driven pin hole at the tip of a driven bracket 9 extending to the base end of the driven side gripping claw 2. 10 are pivotally connected to each other via connecting pins 8a at both ends of the connecting link 11 and driven pins 10a.

On the other hand, in the grip claw frame 3, a fixing pin hole 10A having the same diameter is provided on the same axis line at a portion where the driven pin hole 10 is located in the closed position of the driven side grip claw 2 shown in the figure. The connecting pin 8a and the driven pin 10a can be inserted and removed in the axial direction, and the connecting link 11 can be removed by extracting the connecting pin 8a and the driven pin 10a. Then, by aligning the driven pin hole 10 of the driven side gripping claw with the fixed pin hole 10A of the gripping claw frame and inserting the removed driven pin 10a into the fixed pin hole 10A, the driving side gripping claw 1 and the driven side gripping claw 2 are connected. And the driven side gripping claw 2 is fixed in its closed position.

That is, in the second embodiment, the connecting link 11 is removed and the driven pin hole 10 is inserted into the driven pin 10.
By fixing to the fixed pin hole 10A with a, the double-open state is switched to the single-open state, the driven pin is pulled out from the fixed pin hole, and the connecting link 11 is driven by the connecting pin 8a and the driven pin 10a. By pivotally connecting to the pin hole 10, the one-opened state can be switched to the double-opened state.

[0022]

As described above, according to the present invention, the clamshell type bucket and the gripping claw device can perform the double opening operation and the single opening operation at the same cost as the conventional gripping device which can perform only the double opening operation. It is possible to provide a gripping device, and it is possible to provide a device capable of switching work between single-opening operation and double-opening operation with a simple work in a short time.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment.

FIG. 2 is a side view of the first embodiment used as a shovel.

FIG. 3 is a side view of the second embodiment.

FIG. 4 is a side view showing an example of a conventional clamshell bucket.

[Explanation of symbols]

 1 Drive side gripping member 2 Driven side gripping member 3 Grasping mounting frame 4 Support point pin 5 Support point pin 8 Connecting pin 8a Connecting pin hole 10 Driven pin hole 10A Fixing pin hole 10a Driven pin 11 Driven link 13 Drive pin hole 14 Fixing pin hole

Claims (2)

[Claims] 1. A driving side gripping member (1) and a driven side gripping member (2) are pivotally mounted so as to be swingable around parallel fulcrum pins (4,5) provided on a gripping device frame (3). The driving side gripping member (1) has a driving pin hole (13) and a connecting pin hole (8) parallel to the fulcrum pin, and the driven side gripping member (2) has a driven pin hole (1).
0), the drive cylinder (7) is pivotally connected to the drive pin hole (13), and the connection pin hole (8) and the driven pin hole (10) are pivotally connected by the connection link (11). In the gripping device of the construction machine, the connecting pin hole (8) and the connecting link (11) are the connecting pin (8a)
The gripping device frame (3) is provided with a fixing pin hole (14) that can be separated by pulling out the fixing pin hole.
(14) is a gripping device for a construction machine, characterized in that the driven side gripping member (2) is provided at a position where it is held in the closed position when the ends of the connecting links separated from the connecting pin holes are connected. . 2. A driving side gripping member (1) and a driven side gripping member (2) are pivotally mounted so as to be swingable around parallel fulcrum pins (4,5) provided on a gripping device frame (3). The driving side gripping member (1) has a driving pin hole (13) and a connecting pin hole (8) parallel to the fulcrum pin, and the driven side gripping member (2) has a driven pin hole (1).
0), the drive cylinder (7) is pivotally connected to the drive pin hole (13), and the connection pin hole (8) and the driven pin hole (10) are pivotally connected by the connection link (11). In the gripping device of the construction machine, the connecting link (11) and the driven pin (10a) connecting the connecting link and the driven side gripping member are removable,
In addition, the gripping device frame (3) is provided with a fixing pin hole (10A), and this fixing pin hole (10A) is located on the arcuate locus of the driven pin hole (10) around the fulcrum pin (5). 2) A gripping device for a construction machine, which is provided in a closed position.