JP3461479B2 - Ground excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a ground excavator,
In particular, the present invention relates to a ground excavator in which the efficiency of the revolving work of the upper revolving structure of the ground excavator is improved, the operability of the operation unit is improved, and the erroneous operation is prevented.

[0002]

2. Description of the Related Art As a ground excavator, there is known a ground excavator in which a shaft excavator such as a bucket or an auger is detachably attached to a lower end of a kelly bar supported by an upper swing body.
An example of a general ground excavator of this type will be described with reference to FIG.

In FIG. 1, a ground excavator 1 for excavating the ground 2 has a lower traveling body 3 and an upper revolving body 6 provided above the lower traveling body so as to be freely rotatable by a revolving shaft 5. There is. Reference numeral 5a indicates the axis of the swivel shaft 5. An operator room (operation room) 7 provided in the front part of the upper swing body 6 has an operator seat 9 and an operation unit 10 including various operation levers and pedals.

A jib (support structure) 11 having a base portion pivotally supported is provided on the upper revolving structure 6 so as to be capable of undulating, and a top portion 11a thereof is movable back and forth (movable in a horizontal direction). . Rope 13 extended from winch 12
Is hung from the top 11a of the jib 11 and the kelly bar 1
5 is suspended. A bucket 16 and an auger (not shown) or other shaft excavator is detachably connected to the lower portion of the kelly bar 15. The bottom plate of the bucket 16 is opened to the position shown by the broken line 16a during the earth discharging operation.

A support device 17 provided on the upper swing body 6 side
An excavation frame 19 is supported by the excavation frame 19, and the rotary table 20 of the excavation drive device held by the excavation frame 19 drives the kelly bar 15 to be vertically movable and rotatable.

Next, an example of a conventional operation section of the operator room 7 and a swinging operation of the upper swing body 6 will be described with reference to FIGS. 5 to 9.

In FIG. 5, in front of the operator seat 9 in the operator room 7, a plurality of operating levers such as a winch (kerry bar winding / lowering lever) 21 and operating members such as a turning lever 22 and a throttle pedal 23 are provided. It is arranged. Reference numeral 25 indicates a front panel for displaying various messages. Reference numeral 26 is a swing lock lever operated by the right hand to unlock the swing of the upper swing body 6 at the start of swing and lock after swing, and 27 is a swing lock pin of the lock device 29.
6 is operated.

FIG. 6 shows a plan view of the operator seat 9 part and the turning lever 22 part. A sectional view taken along the line AA of FIG. 6 is shown in FIG. 7A, and a sectional view taken along the line BB is shown in FIG. Show. 6 to 8, reference numeral 30 indicates the center line of the operator seat 9, and the right side of the drawings indicates the front of the ground excavator.

The support shaft 32, to which the base of the lock release lever 26 is fixed, is pivotally supported by a support member 32.
The short arm 33 fixed to the support member 32 and the short arm 36 pivotally supported at one end of the support shaft 35 are connected by a connecting member 37. The support shaft 35 is rotatably supported by a pair of brackets 39, and the swing lock pin 27 is provided at the lower end at the free end of an arm 40 having a base fixed to the other end of the support shaft 35. Fixed support lever 42
The free end of is pivoted.

The swivel lock pin 27 is removably fitted in a lock hole 45 provided in the lock hole member 43. In FIG. 8, reference numeral 26A indicates the lock position of the swing lock lever 26, and reference numeral 26B indicates the lock release position. When the upper revolving structure 6 is turned, the turning lever 22 is operated from the neutral position indicated by reference numeral 22A to the left turning position indicated by 22B when turning left, and by the right turning position indicated by 22C when turning right.

In the conventional operator room 7 (see FIG. 5) thus constructed, the turning lever 22 is operated by the left hand, the throttle pedal 23 is operated by the left foot, and the bucket 16 (see FIG. 1) is moved up and down. Kelly bar hoisting / lowering lever 21 and turning lock lever 2
Both 6 are operated by the right hand. And the right foot is in a state of being completely unused.

A conventional work performed by operating the above-mentioned operation member will be described with reference to a conventional work timing chart shown in FIG.

As shown in FIG. 9, an excavation hole 4 to be axially excavated.
When excavating the bucket 16 in the bucket 6, the kelly bar hoisting / lowering lever 21 described above is operated with the right hand.
6 is rolled up, the swing lock lever 26 is operated by holding the right hand, and the lock of the upper swing body 6 is released. Then, the swing lever 22 is operated by the left hand to swing the bucket 16, and the earth unloading work is performed. . Incidentally, at the time of hoisting / lowering and turning of the bucket 16, the kerry bar hoisting / lowering lever 21,
The throttle pedal 23 is operated by the left foot together with the turning lever 22.

After the earth unloading work is completed, the turning lever 22 is operated with the left hand to rotate the bucket 16 above the excavation hole 46, and the locking device 29 is locked with the right hand. The bucket 16 is unwound into the excavation hole 46 by operating the lever 16 instead of the lever 21. By repeating such an operation, the axial excavation of the excavation hole 46 is performed.

[0015]

In the above-mentioned conventional ground excavator, the right foot is in a play state without being involved in the work while the bucket 16 is being hoisted, unwound, and turned. However, on the right hand side, after operating the kerry bar hoisting / lowering lever 21 for hoisting the bucket 16, the swivel lock lever 26 is replaced and the swivel lock lever 26 is operated to unlock the lock device 29. There is. When the bucket 16 is to be unwound to the excavation hole 46 after the earth unloading work, the turning lock lever 26 is operated with the right hand to lock the locking device 29, and then the right hand is held on the kerry bar hoisting / unwinding lever 21. Instead of bucket 16
Has been unwound.

As described above, by operating both the kelly bar hoisting / lowering lever 21 and the turning lock lever 26 by holding the right hand, the working time of the ground excavator becomes long and the working efficiency decreases. In addition, there is a problem that it may cause a malfunction.

Therefore, in order to improve the efficiency of excavation work without performing two operations with one hand (for example, the right hand), and to prevent malfunction, the technical problem to be solved arises. The invention aims to solve the problems.

[0018]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and an upper traveling body is rotatably provided on a lower traveling body, and the top of the upper revolving body is movable back and forth. The base of the support structure is pivotally supported, a rope fed from a winch is hung from the top of the support structure to suspend a kelly bar on the rope, and the kelly bar is supported by a support device arranged on the upper swing body. Further, in a ground excavator in which a shaft excavator such as a bucket or an auger is detachably connected to the lower end of the kelly bar, the kelly bar hoisting / lowering lever operated by one hand to move the kerry bar up and down. A swivel lever operated by the other hand to swivel the upper swivel body, and the kerry bar hoisting / unwinding lever or the swivel lever at the time of hoisting / unwinding or turning of the kelly bar. And to provide a ground excavator, characterized in that it comprises a throttle pedal operated by the lever and cooperating with one foot.

Further, there is provided a ground excavator characterized by comprising a swing lock pedal which is operated by the other foot for locking and unlocking a lock device for swing-locking when the upper swing body is swinging. To do.

Further, the turning rock pedal can be operated independently and simultaneously with the operations of the kerry bar hoisting / lowering lever, the turning lever, the throttle pedal and the like. To provide a machine.

Further, the lock device has a swing lock pin disposed on the upper swing body so as to be movable back and forth toward the lower traveling body, and a lock hole in which the swing lock pin can be engaged and disengaged. A lock hole member fixed to the lower traveling body, and a pull cable for connecting the lock pedal and the lock pin, and the lock device is locked and unlocked by operating the lock pedal. It is to provide a ground excavator characterized by being operated.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

[0023] As shown in FIGS. 2 and 3, in the vicinity of the operator seat 9 have been arranged is Ke Lieber winding-winding under lever 50 is operated by the right hand (one hand). or,
The swing lever 22 for setting the swing of the upper swing body 6 is operated by the operator's left hand (the other hand). Both levers 50 and 22 are provided near the operator seat 9 to improve operability.

The above-mentioned throttle pedal 23 is operated by the left foot (one foot). A swing lock pedal 51 that is operated by the right foot (the other foot) is arranged on the right front side of the operator seat 9. The swing lock pedal 51 is connected to the swing lock pin 27 of the lock device 29 via a flexible pull cable 52. Rotation lock pedal 51 via a pull cable 52 by depressing the locking device 29 pivot lock pin 27 is disengaged from the lock hole 45 is released, the upper and the rotation lock pedal 51
The locking device is configured to lock when released
ing.

The work of this embodiment performed by operating the above-mentioned operation member will be described with reference to the work timing chart shown in FIG.

An excavation hole 46 to be axially excavated as shown in FIG.
When the bucket 16 in the inside is to be soiled, the above-mentioned kerry bar hoisting / lowering lever 50 is operated with the right hand, and the throttle pedal 23 is depressed with the left foot to wind up the bucket 16, and the turning operation is performed while the hoisting operation is performed. The lock device 51 is unlocked by operating the lock pedal 51 with the right foot.

After the bucket 16 is removed from the excavation hole 46, the swiveling lever 22 is operated with the left hand, and the throttle pedal 23 is stepped on with the left foot to swivel the bucket 16, and then the earth removing work is performed. When the bucket 16 is turned, the operator's right hand does not need to change the lock for unlocking (see FIG. 9) and can continue to operate the kerry bar hoisting / lowering lever 50, so that the bucket 16 is raised. While turning, the turning and the unlocking of the lock device 29 can be performed at the same time, and the work efficiency is improved.

Further, after finishing the earth discharging work, the bucket 1
In order to put 6 into the drilling hole 46, the turning lever 22
Is operated with the left hand to rotate the bucket 16 above the excavation hole 46, and the kelly bar hoisting / lowering lever 50 is operated with the right hand, whereby the bucket 16 is lowered to the upper position in the excavation hole 46. After the swing of the bucket 16 is completed, the swing lock pedal 51 is operated with the right foot to lock the lock device 2.
Lock 9 is activated. Even when the bucket 16 is turned, the operator's right hand is the kelly bar hoisting / lowering lever 5.
Since 0 can be continuously operated, it is possible to lower the bucket 16 while rotating the bucket 16, which improves work efficiency.

As described above, in the conventional device, the right foot, which was idle during excavation work, is used as the swing lock to eliminate the conventional hand-changing operation of the right hand. It is possible to rotate the kelly bar 15, lock the lock device 29, and release the locked state at the same time even when the kerry bar 15 and the bucket 16 connected to the kerry bar 15 are moved up and down. It is improved and the operator's erroneous operation is prevented. Then, by operating the lock device 29 via the flexible pull cable 52, the degree of freedom in arranging the lock device 29 is improved.

In the present embodiment, the case of applying the pile driving machine using the bucket 16 as the machine for performing the vertical movement of the kelly bar, the turning, and the turning lock has been described, but the present invention is not limited to this. The present invention can be applied to a machine having a swing mechanism of an upper swing body such as a crawler crane, a truck crane, a power shovel, and a floating crane. Further, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0031]

As described in detail in the above-mentioned one embodiment, the present invention is provided with a swing lock pedal as an operation portion for swing-locking and unlocking the upper swing body as a dedicated one, and the conventional swing-play pedal is used. By using one foot (the right foot as the other foot) for the operation, both operations of the kelly bar hoisting / lowering lever and the swing lock lever, which were conventionally operated with one hand (for example, the right hand), can be performed. It is possible to specialize in the operation of only hoisting and unwinding, and it is possible to improve work efficiency by eliminating the need to hold one hand, and prevent the occurrence of erroneous operation during excavation work. can do.

Further, unlike the conventional example, since it is not necessary to replace the one hand with the kelly bar hoisting / lowering lever and the swivel lock lever, it is possible to swivel lock with the kerry bar hoisting / winding operation. Operation is also possible, and the kelly bar (upper revolving structure) can be swiveled at the same time when the kerry bar is hoisted and unwound, further improving work efficiency. or,
Since the swing lock pedal is operated via the flexible pull cable, the degree of freedom in arranging the lock device can be increased.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a ground excavator to which an embodiment of the present invention is applied.

FIG. 2 is a side view of an operation room and an operation member of the ground excavator according to the embodiment of the present invention.

FIG. 3 is a plan view of an operation room of the ground excavator according to the embodiment of the present invention.

FIG. 4 is a timing chart of excavation work of the ground excavator according to the embodiment of the present invention.

FIG. 5 is a perspective view of an operation room and an operation member of a conventional ground excavator.

FIG. 6 is a plan view of an operation room of a conventional ground excavator.

FIG. 7 is a side view of a lock device portion of a conventional ground excavator.

FIG. 8 is a side view of a turning lock lever portion and a turning lever portion of a conventional ground excavator.

FIG. 9 is a flowchart of excavation work of a conventional ground excavator.

[Explanation of symbols]

1 Ground Excavator 3 Lower Traveling Body 6 Upper Revolving Body 11 Jib (Supporting Structure) 12 Winch 13 Rope 15 Kelly Bar 16 Bucket 22 Turning Lever (Operating with Right Hand as the Other Hand) 23 Throttle Pedal (with Left Foot as One Foot) 27) Slewing lock pin 29 Locking device 43 Locking hole member 45 Locking hole 50 Kelly bar winding / lowering lever (operated by one hand as left hand) 51 Slewing lock pedal (operated by right foot as the other foot) 52 pull cable

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-316932 (JP, A) Actually open 63-130580 (JP, U) Actually open 5-23223 (JP, U) Actually open 3- 89760 (JP, U) Actual Kaihei 5-27160 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21B 11/00 E21B 3/02 E21B 7/00 E02F 9/12 E02F 9/22

Claims (4)

(57) [Claims] 1. An upper revolving structure is mounted on a lower traveling structure, a top part of the upper revolving structure pivotally supports a base part of a support structure which can be moved back and forth, and a rope fed from a winch is hung from the top part of the support structure. A kelly bar is suspended on the rope, the kerry bar is supported by a supporting device arranged on the upper swing body, and a shaft digging tool such as a bucket or an auger is detachably connected to the lower end of the kelly bar. In the ground excavator, in order to move the kelly bar up and down, a kelly bar hoisting / lowering lever operated by one hand, and a turning lever operated by the other hand for turning the upper revolving structure, A hoisting / lowering lever or a throttle pedal which is operated by one foot in cooperation with the kerry bar hoisting / lowering lever or the turning lever at the time of hoisting / lowering or turning of the kelly bar. Ground excavator. 2. The ground excavator according to claim 1, further comprising a swing lock pedal which is operated by the other foot to lock and unlock the swing lock device when the upper swing body is swinging. . 3. The operation of the turning lock pedal can be carried out independently and simultaneously with the operations of the kerry bar hoisting / lowering lever, the turning lever, the throttle pedal and the like. The ground excavator described in 2 . 4. The swivel lock device has a swivel lock pin disposed on the upper swivel body so as to be capable of advancing and retracting toward the lower traveling body side, and a lock hole in which the swivel lock pin is engageable and disengageable. And a lock hole member fixed to the lower traveling body, and a pull cable that connects the lock pedal and the lock pin, and locks the lock device by operating the lock pedal. The ground excavator according to claim 2, wherein the lock is released.