JPH08269963A - Leader supporting device of boring machine - Google Patents

Abstract

PURPOSE: To heighten the safety by fitting a leader with a drill head with possibility of rising and falling, furnishing a leader supporting shaft of such a structure that the leader can rise and fall in the longitudinal direction, and providing a means to rotate the shaft in the regular and the reverse direction. CONSTITUTION: When a leader supporting shaft 23 of a boring machine 20 is rotated by a cylinder 31 for shaft rotation, a leader 25 and a cylinder 26 for rise and fall are inclined for a certain anglee. When the cylinder 26 is expanded and shrunk, the leader 25 tilts longitudinally so that the vertical condition required to perform operations is maintained. If a cylinder 31 for shaft rotation is expanded and contracted in the condition that the leader 25 is positioned upright, the leader 25 tilts to the left and right for a certain angle so that it takes vertical attitude. To make transport, the cylinder 26 is contracted fully, and the leader 25 is accommodated approx. horizontally in the upper part of a base machine 21. Because this does not receive the load of the leader 25 substantially, its tilting motions to the left and right are stabilized, and the lifetime can be prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leader supporting device for a boring machine, which is used for civil engineering and can store the leader substantially horizontally on an upper part of a base machine during transportation.

[0002]

2. Description of the Related Art Conventionally, Japanese Utility Model Publication No. 5-26111 has been disclosed as a leader supporting device for a pile driver. This structure is shown in Figure 5.
As shown in FIG. 6, the leader support frame 13 is attached to the front bracket 12 of the base machine 10 via the two pairs of front and rear brackets 13a, 13b and 13c, 13d.
a and 14b rotatably support the pile driver 10 in the left-right direction, and the leader 15 and the base end of the undulating cylinder 16 are pivotally attached to the leader support frame 13,
Was connected to the rotating cylinder 17 provided upright on the front bracket 12.

The expansion and contraction of the rotation cylinder 17 causes the leader support frame 13 to rotate in the left-right direction of the pile driving machine 10, so that the leader 15 tilts in the left-right direction. Further, the leader 15 is undulated in the front-rear direction due to the expansion and contraction of the undulating cylinder 16, and the undulating cylinder 16 is fully contracted so that the reader 15 can be stored in the upper portion of the base machine 11 while being laid down substantially horizontally during transportation. It was.

[0004]

However, the rotating cylinder 17 not only has the function of rotating the leader 15 to the left and right, but also shares the load applied to the leader 15 with the pins 14a and 14b during work. It was something to support.

Therefore, during the work, the flow of oil in the rotating cylinder 17 is closed (for example, the operation valve is closed).
It is necessary to fix the rotating cylinder 17, but since a considerable load is applied to the rotating cylinder 17,
The piston of the rotating cylinder 17, the seal of the piston rod, the valve, and the like are easily worn, which shortens the service life and makes the operation unstable.

The present invention has been made in view of the above-mentioned circumstances, and the lower part of the leader is pivotally attached to and supported by the front end of a leader support shaft arranged in the front-rear direction of the front bracket of the base machine. By rotating the leader support shaft with a shaft rotation cylinder attached to the front bracket, the leader is tilted in the left-right direction.

[0007]

SUMMARY OF THE INVENTION A leader supporting device for a boring machine according to the present invention includes a leader on which a drill head is mounted so as to be able to move up and down, and a front bracket arranged on a front bracket of a base machine so as to be rotatable. The reader support shaft is pivotally mounted, and the lower end of the reader is pivotally mounted to the tip end of the reader support shaft so that the reader can be undulated in the front-rear direction. .

Further, the leader supporting device of the boring machine according to the present invention is provided with a leader on which a drill head is vertically movable, and is mounted on a front bracket of the base machine in the front-rear direction and pivotally mounted so as to be rotatable. A leader support shaft in which the lower part of the leader is pivotally attached to the tip so that the leader can be undulated in the front-back direction, and a first hub in which the tip is pivotally attached in the middle of the leader and fixed to the leader support shaft. A base end is pivotally attached, and an undulating cylinder that undulates the leader in the front-back direction by expanding and contracting, and one end pivotally attached to the tip of an arm that is erected at a substantially right angle on a second hub fixed to the leader support shaft. And a shaft rotating cylinder whose other end is pivotally attached to a bracket which is attached to the bracket and is erected laterally from the front bracket.

Further, the first hub fixed to the leader support shaft of the leader support device of the boring machine of the present invention is rotatably fitted on the leader support shaft.

Further, the leader supporting shaft of the leader supporting device of the boring machine according to the present invention is characterized in that the first hub and the second hub are separated from each other and are pivotally attached to the front bracket.

[0011]

The lower portion of the leader is pivotally attached to the tip of the leader support shaft, and can be undulated in the front-back direction by the undulation cylinder.

The leader is supported by the front bracket via the leader support shaft.

Further, the leader support shaft is rotated in the left-right direction by the shaft rotation cylinder while supporting the load of the leader, and the leader is tilted in the left-right direction.

[0014]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 4, 25 is a reader, 2
2 is a front bracket, as shown in FIGS.
In the boring machine 20, a front bracket 22 is arranged in front of a base machine 21, and a leader 25 having a drill head (not shown) mounted thereon so as to be able to move up and down is erected on the front bracket 22. And is configured to be tiltable in the left-right direction. As shown in Figure 1,
The leader 25 is pivotally supported on the front end of a rotatable leader support shaft 23 which is disposed on the front bracket 22 in the front-rear direction via a pin 23a. A first hub 28 is disposed at the rear portion of the leader support shaft 23, and a base end of a hoisting cylinder 26 (FIGS. 2 to 4) is pivotally attached to a pin 28b of a first bracket 28a erected on the first hub 28. The tip of the undulating cylinder 26 has a pin 25 in the middle of the leader 25.
It is pivotally attached via a (FIGS. 2 to 4).

A second portion is provided on the front portion of the leader support shaft 23.
A hub 29 is provided, and an arm 29a is erected at a right angle on the hub 29. A bracket 22a is provided upright on the side of the front bracket 22, and pins 29b, 2 are provided between the tip of the arm 29a and the tip of the second bracket 22a.
A shaft rotating cylinder 31 is attached via 2b.

FIG. 2 is a side view for explaining the first invention,
The first hub 28 is fixed to the leader support shaft 23 with a key 28c. Of course, the second hub 29 is fixed to the leader support shaft 23 by a key or other means not shown. In this case, when the leader support shaft 23 is rotated by the shaft rotation cylinder 31, both the leader 25 and the undulation cylinder 26 are forcibly tilted by a predetermined angle.

FIG. 3 is a side view for explaining the second aspect of the invention. The first hub 28 is rotatably fitted onto the leader support shaft 23, and the leader support shaft 23 is rotated by the shaft rotation cylinder 31. When this is done, the leader 25 is forcibly tilted by a predetermined angle, and the undulating cylinder 26 is also tilted by a predetermined angle by being pulled by this.

FIG. 4 is a side view for explaining the third invention.
Similar to FIG. 3, the first hub 28 is rotatably fitted onto the leader support shaft 23, and the first hub 28 and the second hub 29 of the leader support shaft 23 are separated from each other. When the leader support shaft 23 is rotated by the shaft rotating cylinder 31, the leader 25 is forcibly tilted by a predetermined angle, and the leader 25 is pulled by this, and the undulating cylinder 26 also tilts by a predetermined angle.

2 to 4, the hoisting cylinder 26 is shown.
When the card is expanded or contracted, the leader 25 tilts back and forth to maintain the vertical required for work. Cylinder for undulation 2 during transportation
When the 6 is fully contracted, the leader 25 becomes the base machine 21.
Stored almost horizontally at the top of the. Further, when the shaft rotation cylinder 31 is expanded and contracted with the leader 25 standing upright, the leader 25 tilts in the left-right direction by a predetermined angle, and the leader 25 is made vertical. Therefore, by operating the hoisting cylinder 26 and the shaft turning cylinder 31, the leader 25 can be held in a vertical state required for work or at a required angle.

2 to 4 show a crawler type boring machine, the present invention can be applied to a tire traveling type or a boring machine having no other traveling means, and further, a pile driver or other leader. It can be applied to all construction machines.

[0021]

According to the present invention described in detail above, the following effects are exhibited. (1) The structure in which the leader is supported only by the leader support shaft and is rotated by the shaft rotation cylinder, and the load of the reader is hardly received as well as the rotation unlike the conventional rotation cylinder. The tilting motion of the left and right is stable.

(2) Since a large load is not always applied to the cylinder, damage to the rotating cylinder is small, and the service life of the rotating cylinder can be extended.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of the first invention showing an embodiment of the present invention.

FIG. 3 is a side view of the second invention showing an embodiment of the present invention.

FIG. 4 is a side view of the third invention showing an embodiment of the present invention.

FIG. 5 is a side view of a conventional leader support device for a pile driver.

FIG. 6 is a side view of a conventional pile driver.

[Explanation of Codes] 20 Boring Machine 21 Base Machine 22 Front Bracket 22a First Bracket 23 Leader Support Shaft 25 Reader 26 Elevating Cylinder 28 First Hub 29 Second Hub 29a Arm 31 Shaft Rotating Cylinder

Claims (4)

[Claims] 1. A leader, on which a drill head is mounted so as to be able to move up and down, is arranged in a front bracket in a front-back direction of a base machine, and is pivotally mounted so as to be rotatable, and a lower end of the leader is pivotally mounted at a tip. A leader supporting device for a boring machine, comprising: a leader supporting shaft configured to allow the leader to be undulated in a front-rear direction; and forward and backward rotating means of the leader supporting shaft. 2. A leader in which a drill head is mounted so as to be able to move up and down, a front bracket provided in a front bracket of a base machine, and pivotally mounted so as to be rotatable, and a lower end of the leader is pivotally mounted at a tip. A leader support shaft configured to allow the leader to be undulated in the front-rear direction, a tip pivotally attached to the middle of the leader, and a base end pivotally attached to a first hub fixed to the leader support shaft to expand and contract. An undulating cylinder that undulates the leader in the front-rear direction, and one end pivotally attached to a tip of an arm that is erected at a substantially right angle on a second hub fixed to the leader support shaft, and is erected sideways from the front bracket. A leader support device for a boring machine, comprising: a shaft rotation cylinder whose other end is pivotally attached to an installed bracket. 3. The leader supporting device of a boring machine according to claim 1, wherein the first hub is rotatably fitted on the leader supporting shaft. 4. The leader supporting device of a boring machine according to claim 2, wherein the leader supporting shaft has a first hub and a second hub that are separated from each other and are pivotally attached to a front bracket. .