JP3750777B2 - Excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leader type excavator represented by an earth drill, and more particularly to a type having a thrust cylinder that presses an excavation attachment against the ground.
[0002]
[Prior art]
Leader-type earth drills are a leader connected to a main body and arranged perpendicular to the ground, a drive device that can be moved up and down along the leader, a kelly bar that is rotationally driven by the drive device, and a drill that is attached to the tip of the kelly bar And a bucket. The rope fed out from the winch of the main body is hung around the upper end of the leader, a kelly bar is connected to the tip of the rope, and the kelly bar is raised and lowered by driving the winch. When the kelly bar is lowered to ground the excavation bucket and the kelly bar is rotationally driven by the driving device, the excavation bucket rotates together to excavate the ground.
[0003]
Some earth drills of this type have a thrust cylinder that presses the excavation bucket against the ground. Conventionally, both ends of this thrust cylinder are connected to the upper part of the leader and the driving device, respectively, and the excavation bucket is connected via the driving device and the kelly bar by integrating the driving device and the kelly bar in the vertical direction and then extending the thrust cylinder. Press against the ground.
[0004]
[Problems to be solved by the invention]
When one end of the thrust cylinder is connected to the leader upper portion as in the prior art, the thrust reaction force of the thrust cylinder acts on the leader upper portion. Since the upper part of the leader also acts as a winch hoisting force, the leader must be rigid enough to withstand these external forces, and the leader must be heavier. Moreover, since the lower part of the leader is supported by the main body, when a force is applied to the upper part, the leader is deformed so as to warp, and the linearity of the excavation hole is deteriorated.
[0005]
An object of the present invention is to provide an excavator that prevents undesired deformation or the like of the leader without devising the rigidity of the leader by devising the attachment position of the thrust cylinder.
[0006]
[Means for Solving the Problems]
Referring to FIG. 1 showing an embodiment, the present invention is supported by an excavator body 1 and arranged substantially perpendicular to the ground, and can be moved up and down along the leader 4 on the leader 4. Applicable to an excavator provided with a drive device 5, excavation attachments 10 and 11 that are rotationally driven by the drive device 5 and can be moved up and down integrally with the drive device 5, and a thrust cylinder 12 that presses the excavation attachment 11 against the ground. Is done.
One end of the thrust cylinder 12 is connected to the drive device 5, and the other end is connected to the reader 4 or a member 13 connected to the lower end portion of the reader 4. The drive device 5 moves up and down on the leader 4 by the expansion and contraction of the thrust cylinder 12. To do .
According to the second aspect of the present invention, the excavation attachment is capable of taking a state in which the excavation attachment can be moved up and down integrally with the drive unit 5 and a state in which the excavation attachment can be moved up and down with respect to the drive unit 5, and a excavation bucket coupled to the lower end of the 11.
According to the third aspect of the present invention, the other end of the thrust cylinder 12 is connected to an elevating member 13 that is positioned below the leader 4 and can be raised and lowered with respect to the reader 4. Is configured to move up and down integrally.
[0007]
In the section of the means for solving the above-described problem to explain the configuration of the present invention, the drawings of the embodiments are used for easy understanding of the present invention, but the present invention is thereby limited to the embodiments. It is not something.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side view of an earth drill in the present embodiment. A leader 4 is supported on the earth drill body 1 through a front frame 2 and a backstay cylinder 3 in a state perpendicular to the ground, and a driving device 5 is attached to the leader 4 so as to be movable up and down. A guide sheave 6 provided at the top of the leader 4 is hung by a rope 8 fed from a winch 7 of the main body 1, and the upper end of the kelly bar 10 is connected to the tip of the rope 8. The kelly bar 10 passes through the driving device 5 and a drilling bucket 11 is attached to the lower end thereof.
[0009]
The kelly bar 10 is rotationally driven by the driving device 5, and the excavation bucket 11 also rotates together with this. The kelly bar 10 can be switched between a state in which it is integrated vertically with respect to the driving device 5, that is, a state in which it can be lifted and lowered integrally with the driving device 5 and a state in which it can be lifted and lowered relative to the driving device 5. The switching is performed via a mechanism (not shown).
[0010]
A base end portion of a thrust cylinder 12 is connected to the drive device 5, and a tip end of the piston rod is connected to an auxiliary bracket (elevating member) 13 provided at the lower end portion of the reader 4. A piston rod of an elevating cylinder 14 is connected to the auxiliary bracket 13, and a base end portion of the elevating cylinder 14 is connected to the reader 4. When the elevating cylinder 14 is extended, the auxiliary bracket 13 is lowered as shown in FIG. 2, and the thrust cylinder 12 and the driving device 5 are integrally lowered. The auxiliary bracket 13 and the lifting cylinder 14 are provided for convenience when the Keriba 10 is inserted into and removed from the drive device 5 as will be described later.
[0011]
The operation of the earth drill configured as described above will be described.
In FIG. 1, both the thrust cylinder 12 and the lifting cylinder 14 are contracted, and the auxiliary bracket 13 is integrated with the reader 4 via the lifting cylinder 14. However, it is desirable to attach a stopper member so that the auxiliary bracket 14 does not undesirably descend due to leakage of the elevating cylinder 14 or the like.
[0012]
In the excavation work, when the thrust cylinder 12 is extended in the state of FIG. 1, the driving device 5 rises along the leader 4. At this time, the vertical integration of the kelly bar 10 and the driving device 5 is released, and therefore the kelly bar 10 does not move even when the driving device 5 is raised. The rope 8 is fed out from the winch 7 to lower the kelly bar 10 and the excavation bucket 11 is grounded, and then the driving device 5 and the kelly bar 10 are integrated in the vertical direction to contract the thrust cylinder 12. As a result, a downward force acts on the driving device 5 via the thrust cylinder 12 and the excavation bucket 11 is pressed against the ground via the kelly bar 10. In this state, the driving device 5 rotates the kelly bar 10 to rotate the excavation bucket 11 to excavate the ground.
[0013]
When the thrust cylinder 12 is completely contracted, the vertical integration of the kelly bar 10 and the driving device 5 is released, the thrust cylinder 12 is extended and the driving device 5 is lifted, and then integrated with the kelly bar 10 again. Repeat the same operation.
At the time of earth removal, the vertical integration of the kelly bar 10 and the driving device 5 is released, and the kelly bar 10 is lifted up alone by the rope 8 to be earthed.
[0014]
In the excavation work described above, the excavation reaction force acts on the lower part of the leader 4 when the thrust cylinder 12 presses the excavation bucket 11 against the ground. However, since the front frame 2 and the backstay cylinder 3 that support the leader 4 are connected to the lower part of the leader 4, the leader 4 is hardly deformed even if a force is applied to the lower part. In particular, in the present embodiment, the rigidity of the lower portion of the leader 4, the front frame 2, and the backstay cylinder 3 is increased by forming a substantially triangular shape. There is almost no risk of deformation. On the other hand, since the cylinder force does not act on the upper portion of the leader 4, only the hoisting force of the winch 7 needs to be considered. Even if the rigidity is lowered as compared with the conventional case, the leader 4 does not warp, Straightness can be secured.
[0015]
By the way, when the thrust cylinder 12 is arranged at the lower part of the reader 4 as in the present embodiment, the drive device 5 cannot be lowered to the lower part of the reader 4 as it is, and the kelly bar 10 is moved to the drive device 5 from above. This causes trouble when inserting and withdrawing the Keriba 10 upward. In the present embodiment, as described above, the auxiliary bracket 13 and the elevating cylinder 14 are provided, and the elevating cylinder 14 is extended and the auxiliary bracket 13 is lowered, so that the driving device 5 is moved together with the thrust cylinder 12 as shown in FIG. 4 can be lowered to the lower part of 4, so that the insertion and removal of the kelly bar 10 can be performed without any trouble. Therefore, it is not necessary to make the reader 4 longer than necessary for inserting / removing the Keriba.
[0016]
Although the example in which the thrust cylinder 12 is disposed on the front surface of the reader 4 has been described above, it may be disposed on the side surface of the reader 4 as shown in FIG. Also in this case, if the thrust cylinder 12 is connected to the driving device 5 and the auxiliary bracket 13 and the auxiliary bracket 13 is moved up and down by the elevating cylinder 14, the same function as described above can be achieved.
The auxiliary bracket 13 and the elevating cylinder 14 may be omitted, and the thrust cylinder 12 may be connected to the driving device 5 and the lower end portion of the leader 4 as shown in FIG.
[0017]
【The invention's effect】
According to the present invention, one end of the thrust cylinder is connected to the driving device, and the other end is connected to the lower end of the reader or a member connected to the lower end of the reader below the driving device. The cylinder force of the thrust cylinder does not act on the part. Although the cylinder force acts on the lower part of the reader, the support member that supports the reader on the main body is usually connected to the lower part of the reader, in other words, the reader is supported on the main body at the lower part. The reader is unlikely to be deformed even if acts. Therefore, it is possible to prevent the reader from warping or the like without increasing the rigidity of the reader so that the reader can be reduced in weight.
If the other end of the thrust cylinder is connected to an elevating member that can be raised and lowered with respect to the reader, and the thrust cylinder and the driving device can be raised and lowered integrally by raising and lowering the elevating member, the driving device is lowered by the raising and lowering member, thereby excavating The attachment and the drive device can be easily engaged, and the reader does not have to be longer than necessary.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of an earth drill according to an embodiment of the present invention.
FIG. 2 is a view similar to FIG. 1 and showing a state in which the kelly bar is inserted into and removed from the drive device;
FIG. 3 is a side view showing a configuration of an earth drill according to another embodiment.
FIG. 4 is a side view showing a configuration of an earth drill in still another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground drill main body 2 Front frame 3 Backstay cylinder 4 Leader 5 Driving device 6 Guide sheave 7 Winch 8 Rope 10 Keriba 11 Excavation bucket 12 Thrust cylinder 13 Auxiliary bracket 14 Lifting cylinder

Claims (3)

A reader supported by the excavator body and arranged substantially perpendicular to the ground, a drive device that can be moved up and down along the reader on the reader, and a digging device that is rotationally driven by the drive device and can be raised and lowered integrally with the drive device In an excavator comprising an attachment and a thrust cylinder for pressing the excavation attachment against the ground,
The thrust cylinder has one end connected to the driving device and the other end connected to the lower end of the reader or a member connected to the lower end of the reader. The driving device is connected to the leader by the expansion and contraction of the thrust cylinder. Excavator characterized by moving up and down.   The excavation attachment comprises a kelly bar capable of moving up and down integrally with the driving device and a state capable of moving up and down with respect to the driving device, and a drilling bucket connected to a lower end of the kelly bar. The excavator according to claim 1.   The other end of the thrust cylinder is connected to an elevating member that is positioned below the reader and can be moved up and down with respect to the reader, and the thrust cylinder and the driving device are moved up and down integrally by raising and lowering the elevating member. The excavator according to claim 1 or 2, wherein

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