JP2000096599A - Bucket device for shovel system excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly perform excavation working or the like using a bucket by simple constitution. SOLUTION: This bucket device attached to the edge part of the boom of a shovel system excavator is provided with an attaching bracket 1 provided on the edge part of a boom, first and second buckets 6, 7 freely fluctuatingly supporting bucket shafts 4, 5 as fulcrums in the opening/closing direction respectively, and a drive means 8 fluctuating and displacing the first and second buckets 6, 7 and opening or closing both the buckets 6, 7. In the case where the first bucket 6 is fluctuated and displaced in the maximum open position, a regulation part abutted on the first bucket 6 and comprising a stopper plate 14 regulating the displacement of the first bucket 6 is provided on the attaching bracket 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shovel-type excavator bucket device which is attached to the end of a boom of a shovel-type excavator.

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 3-144221, a movable bucket which is swingably supported by a mounting pin as a fulcrum and driven to be opened and closed by a hydraulic cylinder, In an openable / closable bucket device which is pivotally mounted on a mounting chassis provided at the tip of an arm portion or the like of a power shovel, a swivel lock between the mounting chassis and the bucket portion which disables pivoting of the bucket. Means are provided, and by the operation of the lock means, the bucket portion is configured to be switchable between a non-turnable state and a movable state, so that when a heavy long object is lifted or an eccentric load is applied during excavation. Even at the time, there is no inconvenience that the bucket part rotates unexpectedly, and it is possible to prevent danger during work and improve work efficiency. It has been done to so.

[0003]

SUMMARY OF THE INVENTION
The bucket portion is switched from a pivotable state to a non-rotatable state by a turning lock means or the like configured to insert and engage a lock pin protruding from the mounting chassis into a lock hole provided in the bucket portion. When the excavating work is performed using the bucket body in a state where the movable bucket is oscillated by the hydraulic cylinder and is separated from the bucket body while the structure is complicated and the structure is complicated, the above-described lock is used. There is a problem that an excessive load acts on the engaging portion between the pin and the lock hole, and the engaging portion is easily damaged.

The present invention has been made in view of the above circumstances, and provides a bucket device of a shovel-based excavator capable of appropriately performing excavation work using a bucket with a simple configuration.

[0005]

The invention according to claim 1 is
A bucket device attached to a boom tip of a shovel type excavator, wherein a mounting bracket provided at the boom tip and a first and a second bucket supported to be swingable in opening and closing directions with a bucket shaft as a fulcrum. And a drive means for swingingly displacing the first and second buckets to open and close both buckets. When the first bucket is swingably displaced to the maximum open position, the first bucket is brought into contact with the first bucket. A restricting portion for restricting the displacement of the first bucket is provided on the mounting bracket.

[0006] According to the above configuration, in a state where the first and second buckets are swingably displaced to the open position by the driving means,
The load that acts when performing the excavation work or the like using the first bucket is supported by the restricting portion, so that the excavation work or the like is performed stably.

According to a second aspect of the present invention, in the bucket apparatus of the shovel type excavator according to the first aspect, a hydraulic cylinder is provided as driving means for swingingly displacing the first and second buckets. Is provided with a safety valve that allows the first bucket to swing when a load equal to or more than a certain value acts on the first bucket.

[0008] According to the above configuration, the first bucket is allowed to swing in the opening direction due to the load applied when performing excavation work or the like using the first bucket. The gripper is held at the maximum open position in contact with the regulating portion, and when the predetermined gripper is gripped using the first and second buckets, damage to the gripper is prevented.

According to a third aspect of the present invention, the first and second buckets are supported so as to be pivotable in an integrated state about a pivot shaft provided on the mounting bracket.
2. A hydraulic motor for turning a second bucket.
In the bucket device for an excavator-type excavator according to claim 2, a safety circuit that allows rotation of the hydraulic motor while the rotation of the hydraulic motor is stopped is provided in a hydraulic circuit that supplies operating hydraulic pressure to the hydraulic motor. It is a thing.

According to the above construction, the first and second buckets are swingably displaced to the open position by the driving means, and the excavation work or the like using the first bucket is performed in a state where the rotation of the hydraulic motor is stopped. As a result, the rotation of the hydraulic motor is permitted by the load acting on the first bucket, and as a result, the first bucket moves to a position facing the regulating portion and is held at the maximum open position.

According to a fourth aspect of the present invention, there is provided a bucket device attached to a boom tip of a shovel excavator, wherein: a mounting bracket provided at the boom tip.
A first bucket and a second bucket, each of which is swingably supported in the opening and closing direction with a bucket shaft as a fulcrum, and a driving means for swingingly displacing the first and second buckets to open and close both buckets. A concave portion for holding is provided on one side wall of the first and second buckets, and the other of the first and second buckets has
A gripping plate having a concave portion for gripping is protruded, and when both buckets are closed, the side surface of the concave portion provided on the side wall portion of the bucket is covered by the gripping plate.

According to the above configuration, when both buckets are closed, the side surface of the recess provided in one of the buckets is covered with the gripping plate, so that the side wall of the bucket is held in a sealed state. . In addition, the first
In the state where a log material or the like is interposed between the concave portion for grip provided on one side wall portion of the second bucket and the concave portion of the grip plate protruded on the other of the first and second buckets, By swinging and displacing the buckets in the closing direction, the log material and the like can be stably gripped by the buckets.

[0013]

1 to 4 show an embodiment of a bucket device for a shovel excavator according to the present invention. This bucket device is rotatable around a turning bracket 2 provided at the end of the boom of the shovel excavator and a turning shaft 2 formed by a turning shaft of a swivel joint provided on the mounting bracket 1. A rotating bracket 3 supported, and first and second buckets 6 and 7 supported by a pair of bucket shafts 4 and 5 provided on the rotating bracket 3 so as to be swingable in the opening and closing directions. And a driving means 8 for swingingly displacing the first and second buckets 6, 7 to open and close both buckets 6, 7.

The driving means 8 includes a hydraulic cylinder 10 having one end pivotally supported by the rotating bracket 3 and the other end pivotally supported by a driving rib 9 projecting above the first bucket 6. And one end of the drive rib 9 of the first bucket 6
Drive arm 12 pivotally supported by a drive rib 11 having the other end protruding above the second bucket 7.
And is constituted by.

When the hydraulic cylinder 10 shifts from the extended state shown in FIG. 1 to the contracted state shown in FIG. 3, the first bucket 6 is driven by the hydraulic cylinder 10 to move from the closed position shown in FIG. 3 and the second bucket 7 is driven by the drive arm 12 to swing from the closed position shown in FIG. 1 to the open position shown in FIG. The oscillating displacement is performed around the fulcrum 5.

When the first bucket 6 is pivotally displaced to the maximum open position shown in FIG.
The first bucket 6 is provided with a restricting portion including a stopper plate 14 that restricts the displacement of the first bucket 6 by contacting a contact plate 13 provided on the upper surface of the front end portion of the driving rib 11.

Further, the first and second buckets 6, 7 are pivotally displaced integrally with the mounting bracket 1 by pivotally displacing the pivot bracket 3 about the pivot shaft 2. A hydraulic motor 15 is provided.
That is, the output shaft of the hydraulic motor 15 is provided with a drive gear for driving a ring gear attached to the rotating bracket 3, and the ring gear is driven by the drive gear, thereby rotating the turning shaft 2. The first and second buckets 6 and 7 are configured to be pivotally displaced in an integrated state about the center.

Each of the left and right side walls 16 of the first bucket 6 has a concave portion 1 for gripping, which is formed by an arc-shaped notch.
7 is formed, and a gripping plate 19 having a gripping concave portion 18 formed of an arc-shaped notch or the like is provided on the second bucket 6 along the left and right side wall portions 20. When the buckets 6 and 7 are closed, the front end of the gripping plate 19 is inserted into the first bucket 6 so that the recess 17 provided in the side wall 16 of the first bucket 6 holds the gripping plate 19. It is configured to be covered by the plate 19.

As shown in FIG. 4, the excavator-based excavator is provided with the hydraulic cylinder 10 and the hydraulic motor 15, and a hydraulic circuit that supplies and discharges an operating hydraulic pressure to a drive cylinder 21 that drives a boom of the excavator-type excavator. Have been. The hydraulic circuit includes a hydraulic pump 22 driven by an engine of a shovel excavator, a switching valve 23 for switching a supply direction of hydraulic oil discharged from the hydraulic pump 22, the hydraulic cylinder 10, the hydraulic motor 15, Switching valves 24, 25, 26 for the drive cylinder 21 and a pressure control valve 27 for adjusting the maximum hydraulic pressure are provided.

In the hydraulic circuit for the hydraulic cylinder 10, when a load equal to or more than a predetermined value acts in the direction in which the buckets 6, 7 are opened and closed while the operation of the hydraulic cylinder 10 is stopped, the hydraulic cylinder A safety valve 28 that allows the operation of the valve 10 and an accumulator 29 are provided. That is, when a load equal to or more than a certain value acts in the direction in which the piston of the hydraulic cylinder 10 is pushed, the operating oil pressure flows through the safety valve 28 and the operating oil pressure discharged from one end side of the cylinder becomes the accumulator. And the accumulator 29
Is supplied to the other end of the cylinder, whereby the hydraulic cylinder 10 is allowed to expand and contract.

Further, in the hydraulic circuit for the hydraulic motor 15, when a load equal to or more than a predetermined value for rotating the buckets 6, 7 and the like is applied while the operation of the hydraulic motor 15 is stopped, the operating hydraulic pressure is reduced. A safety valve 30 is provided to allow the hydraulic motor 15 to rotate while being circulated, and a throttle valve 31 is provided to adjust the flow of operating hydraulic pressure.

In the above configuration, both buckets 6, 7
Is closed, the switching valves 23 and 24 are switched in the directions shown by the arrows in FIG. 4 to supply operating hydraulic pressure in the direction in which the hydraulic cylinder 10 is extended. As a result, the buckets 6, 7 are driven in the closing direction by the hydraulic cylinder 10 and the drive arm 12, and as shown in FIG. 1, the buckets 6, 7 transition to the closed state in which the side walls 16, 20 abut each other. Will be.

On the other hand, when the two buckets 6 and 7 are opened, the operating oil pressure is changed in the direction of contracting the hydraulic cylinder 10 by switching the switching valve 23 in the direction opposite to the direction shown by the arrow in FIG. Supply. As a result, the buckets 6, 7 are driven in the opening direction by the hydraulic cylinder 10 and the drive arm 12, and as shown in FIG. 3, the side walls 16, 20 of the buckets 6, 7 shift to the open state in which they are separated from each other. become.

The mounting bracket 1 provided at the end of the boom as described above, the first and second buckets 6 and 7 supported by the bucket shafts 4 and 5 so as to be swingable in the opening and closing directions, respectively. A drive means 8 for swinging the first and second buckets 6, 7 to open and close the two buckets 6, 7 is provided. When the first bucket 6 is swingably displaced to the maximum open position, Since the mounting bracket 1 is provided with a restricting portion formed of the stopper plate 14 that abuts on the first bucket 6 and restricts the displacement of the first bucket 6, the first and second buckets 6 and 7 are opened by the driving unit 8. When performing a digging operation or the like using the first butt 6 in a state where the first butt 6 is rocked and displaced, even when a large load is applied, the load can be stably supported by the restricting portion. Therefore, as shown in the prior art, the load acting during the above-mentioned excavation work or the like is stably supported with a simple configuration without employing a complicated configuration of the lock means including the lock hole and the lock pin. Work and the like can be properly performed, and damage to the regulating section can be effectively prevented.

In the above embodiment, the hydraulic cylinder 1
Hydraulic cylinder 10
The first and second buckets 6 and 7 in the operation stopped state
A safety valve 27 that allows the operation of the hydraulic cylinder 10 when a load equal to or more than a certain value acts in the direction in which the
Is provided, the first bucket 6 is allowed to swing further in the opening direction in a state where both buckets 6 and 7 are held at the semi-open position.

Therefore, when the first and second buckets 6 and 7 are swingably displaced to the open positions by the driving means 8, there is a situation where the first bucket 6 cannot be displaced to the maximum open position for some reason. Even in the case of occurrence, the first bucket 6 is pivotally displaced in the opening direction in accordance with the load applied when performing excavation work or the like using the first bucket 6 so that the first bucket 6 is moved to the maximum open position. Therefore, the load acting on the excavation work or the like using the first bucket 6 can be stably supported by the restricting portion including the stopper plate 14. Further, by providing the safety valve 27, the first and second buckets 6, 7 are provided.
There is an advantage that damage to the gripping object can be prevented when a low-strength gripping object made of a concrete block or the like is gripped by using the method.

Further, in the above embodiment, the first and second buckets 6 and 7 are supported so as to be able to turn integrally with the turning shaft 2 provided on the mounting bracket 1 in an integrated state. The hydraulic motor 1
5, when a load equal to or more than a certain value acts in a direction in which the buckets 6, 7 and the like are rotationally driven, the hydraulic motor 15 is allowed to rotate.
When the first and second buckets 6 and 7 are pivotally displaced to the open position by the driving means 8 and the rotation of the hydraulic motor 15 is stopped, the contact plate 13 of the first bucket 6 is moved for some reason. Even in the case where the rotation of the hydraulic motor 15 is stopped in a state where the hydraulic motor 15 is not opposed to the stopper plate 14, the hydraulic pressure is reduced by the load applied when performing the excavation work using the first bucket 6. As a result of the rotation of the motor 15 being allowed, the contact plate 13 of the first bucket 6 can be displaced from the position facing the restricting portion. Therefore, the abutment plate 13 of the first bucket 6 is brought into contact with the restricting portion formed by the stopper plate 14 so that the first bucket 6 is held at the maximum open position. The load acting on work or the like can be stably supported by the restricting portion.

Further, a concave portion 17 for gripping is provided in a side wall portion 16 of the first bucket 6 and a second bucket 7 is provided.
A gripping plate 19 having a concave portion 18 for gripping is protruded therefrom. When the buckets 6 and 7 are closed, the concave portion 17 provided on the side wall portion 16 of the first bucket 6 is covered by the gripping plate 19. As a result, the buckets 6 and 7 are closed and the side walls 16 and 20 of the buckets 6 and 7 are kept in a sealed state without the need for complicated work such as removing the gripping plate 19. be able to. Therefore, operations such as conveying the mortar injected from the opening provided in the upper wall of the first bucket 6 can be easily and appropriately performed.

As shown in FIG. 5, the first bucket 6
In the state where the log 32 and the like are interposed between the holding recess 17 provided on the side wall portion 16 of the holding member 16 and the recess 18 of the holding plate 19 protruding from the second bucket 6, By swinging and displacing the buckets 6 and 7 in the closing direction, the log 32 and the like can be stably gripped by the buckets 6 and 7.
The work of transporting the log 32 can be easily performed.

The holding recesses 17 and 18 are not limited to arc shapes, but may be changed to various shapes such as an elliptical shape or a polygonal shape. The second bucket 7
A concave portion for gripping is provided in the side wall portion 20 of the first bucket 6, and a gripping plate 20 having a concave portion for gripping is protruded from the first bucket 6. When both buckets 6 and 7 are closed, the side wall of the second bucket 7 is closed. The side surface of the concave portion provided in the portion 20 may be configured to be covered by the grip plate.

[0031]

As described above, the present invention relates to a bucket device attached to the end of a boom of a shovel excavator, wherein the mounting bracket provided at the end of the boom and the bucket shaft are used as fulcrums to open and close, respectively. First and second buckets supported so as to be swingable in
Drive means for swingingly displacing the second bucket to open and close both buckets. When the first bucket is swingably displaced to the maximum open position, the first bucket comes into contact with the first bucket to reduce the displacement of the first bucket. Since the restricting portion for restricting is provided on the mounting bracket, when the first and second buckets are rocked and displaced to the open positions by the driving means, when performing excavation work or the like using the first butt, a large size is required. Even when a load is applied, there is an advantage that the load can be stably supported by the restricting portion, and the excavation work or the like can be appropriately performed with a simple configuration.

The present invention also provides a mounting bracket provided at the end of a boom, first and second buckets which are swingably supported in the opening and closing directions with a bucket shaft as a fulcrum. A driving means for swingingly displacing the two buckets to open and close both buckets, providing a concave portion for gripping on one side wall of the first and second buckets,
A grip plate having a concave portion for grip is protrudingly provided on the other side of the second bucket, and when both buckets are closed, the side surface of the concave portion provided on the side wall portion of the bucket is covered by the grip plate. Therefore, by closing both of the buckets, it is possible to easily and appropriately perform operations such as conveying mortar. Also, the first
A holding recess provided on a side wall of the bucket or the like;
Between the concave portion of the grip plate protruding from the bucket, etc.
By closing both buckets with the log material or the like interposed, the log material or the like can be stably gripped by the two buckets, so that the work of transporting the log material or the like can be easily performed. There is an advantage that you can.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a bucket device of a shovel excavator according to the present invention.

FIG. 2 is a side view showing a configuration of the bucket device.

FIG. 3 is an explanatory diagram showing an open state of a bucket.

FIG. 4 is a circuit diagram showing a specific configuration of a hydraulic circuit.

FIG. 5 is an explanatory diagram showing a gripping state of a log or the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting bracket 2 Revolving shaft 4, 5 Bucket shaft 6 First bucket 7 Second bucket 8 Drive means 10 Hydraulic cylinder 14 Stopper plate (restriction part) 15 Hydraulic motor 27, 29 Safety valve

Claims (4)

[Claims] 1. A bucket device attached to a boom tip of a shovel type excavator, wherein a mounting bracket provided at the boom tip and a second bracket supported swingably in an opening / closing direction with a bucket shaft as a fulcrum. First and second buckets, and drive means for swinging the first and second buckets to open and close both buckets. When the first bucket is swingably displaced to the maximum open position, the first A bucket device for an excavator-type excavator, wherein a restricting portion that contacts the bucket and restricts displacement of the first bucket is provided on the mounting bracket. 2. The excavator bucket device according to claim 1, further comprising a hydraulic cylinder as driving means for swingingly displacing the first and second buckets. A bucket device for a shovel-type excavator, further comprising a safety valve that allows the first bucket to oscillate when a load equal to or more than a predetermined value acts on the first bucket. 3. A hydraulic motor for rotating the first and second buckets while the first and second buckets are supported so as to be able to rotate integrally with a rotation axis provided on the mounting bracket. 3. The excavator bucket apparatus according to claim 1 or 2, wherein the hydraulic circuit that supplies the operating hydraulic pressure to the hydraulic motor allows rotation of the hydraulic motor while the rotation of the hydraulic motor is stopped. A bucket device for a shovel-based excavator, comprising a safety valve that operates. 4. A bucket device attached to the end of a boom of a shovel excavator, wherein a mounting bracket provided at the end of the boom and a second bracket supported swingably in an opening / closing direction with a bucket shaft as a fulcrum. A first bucket and a driving means for swingingly displacing the first and second buckets to open and close the two buckets, and a concave portion for gripping is provided on one side wall of the first and second buckets; ,
On the other of the first and second buckets, a holding plate having a recess for holding is protruded, and in a closed state of both buckets, a side surface of the recess provided on the side wall of the bucket is covered by the holding plate. A bucket device for a shovel excavator, wherein the bucket device is configured as described above.