JP2906734B2 - Excavator leader support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leader support device for an excavator.

[0002]

2. Description of the Related Art A conventionally known excavator leader is supported at its lower part by a catch fork projecting forward of a main body.
In general, the stay is fixed by a stay connecting the upper rear surface and the rear portion of the main body.

[0003] Fig. 4 shows the outline. An excavator body 1 includes a lower frame 2 having a traveling device and the lower frame 2.
And a support arm 5 having a catch fork 4 at the front end of the upper frame 3. The support arm 5 is provided at the front end of the upper frame 3 with the catch fork 4. The projecting hinge pin 7 is supported.

[0004] Reference numeral 8 denotes a slide cylinder attached to the side surface of the support arm 5, which slides the hinge pin 7 back and forth within the fork length of the catch fork 4 to adjust the working radius of the leader 6. The adjustment stroke is usually 200 to 50
It is about 0 mm.

Reference numeral 9 denotes a telescoping stay, one end of which is rotatably connected to the upper frame 3 of the main body 1 and the other end of which is rotatably connected to the upper rear surface of the reader 6, and which fixes the reader 6 in a vertical position. It is for doing.

Reference numeral 10 denotes a kelly bar which can move up and down along the leader 6, and has a lower end provided with a drilling tool 11 such as an earth drill.
The excavating tool 11 is rotatably driven by a rotary drive device 12 such as a rotary table.

[0007] As described above, the leader 6 is supported by the catch fork 4 and the stay 9, the height thereof is always constant, and the adjustment width in the front-rear direction is equal to that of the catch fork 4.
Keriba 10
The vertical stroke and the front-rear stroke of the excavator 11 are naturally restricted, so that not only the vertical stroke and the working radius of the excavating tool 11 cannot be increased, but also the leader 6
Can tilt only in the front-rear direction and not in the left-right direction, so that the excavation direction is restricted.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has been made.
An object of the present invention is to provide a reader supporting device that can adjust the mounting position of the reader up and down, expand the adjustment width in the front-rear direction, and can tilt in the front, rear, left, and right directions to improve workability. is there.

[0009]

SUMMARY OF THE INVENTION The present invention provides a means for solving the above-mentioned problems. A front frame 13 is pivotally attached to the front of an upper frame 3 of a main body 1 so that the front frame 13 can be raised and lowered. Forward and backward and left and right at the front end of the head 14 via the universal joint 14a
The upper and lower ends of a pair of left and right stays 15a and 15b having lower ends pivotally connected to the upper and lower rear portions of the upper surface of the head 14 are pivotally connected to the substantially central rear surface of the reader 6, while connecting the lower rear surface of the reader 6 as possible. Then, the left and right stays 15a and 15b are
Each hydraulic cylinder can be individually expanded and contracted, and
The gist of the present invention is a leader support device for an excavator, wherein a front frame undulating cylinder 16 is disposed between a rear portion of the head 14 and a rear portion of the upper frame 3.

[0010]

1 shows a side view of an entire excavator equipped with a leader support device of the present invention, and FIG. 2 shows a rear view thereof.

The same parts as those of the conventional example shown in FIG. In the figure, reference numeral 1 denotes a main body of an excavator, which is composed of a lower frame 2 having a traveling device and an upper frame 3 which is swingably mounted on the lower frame 2, and a front portion of the upper frame 3 has: A front frame 13 having a head 14 at an upper end is pivotally mounted so as to be able to move up and down.

The upper end head 1 of the front frame 13
The front end of 4 is connected to the lower rear surface of the reader 6 via a universal joint 14a. A pair of left and right stays 15a, 15
The lower end of the stay b is pivotally mounted, and the upper ends of the stays 15a and 15b are pivotally mounted substantially at the center rear surface of the reader 6. The stays 15a and 15b are extendable and retractable by hydraulic cylinders (not shown).

Reference numeral 16 denotes a front frame undulating cylinder, the upper end of which is pivotally attached to the rear of the head 14 of the front frame 13 and the lower end of which is pivotally attached to the rear of the upper frame 3, respectively. The front frame 13 can be raised and lowered.

Reference numeral 10 denotes a kelly bar which can be moved up and down along the leader 6, and has a lower end provided with a drilling tool 11 such as an earth drill.
The excavating tool 11 is rotatably driven by a rotary drive device 12 such as a rotary table. Reference numeral 17 denotes a thruster cylinder, which can slide the rotary driving device 12 up and down along the reader 6. Reference numeral 18 denotes a hoisting rope of the keliva 10.

[0014]

Next, the operation will be described. First, when the front frame up-and-down cylinder 16 is expanded and contracted, the front frame 13 is raised and lowered. That is, as shown in FIG. 3, when the cylinder 16 is extended, the front frame 13 falls forward, and the leader 6 moves downward while moving forward.
Conversely, when the length is reduced, the front frame 13 stands up, and the leader 6 moves upward while moving backward.

When the left and right stays 15a and 15b are simultaneously expanded and contracted, the reader 6 tilts back and forth. That is, when the stays 15a and 15b are simultaneously extended, the leader 6 is inclined forward with the universal joint 14a as the center of tilt, and conversely, when the length is reduced, the leader 6 is inclined backward. Similarly, when the left stay 15a is extended (reduced), the right side (left side) is obtained.
When the right stay 15b is extended (contracted), it is inclined leftward (rightward).

As described above, the leader 6 can be moved up and down and up and down by raising and lowering the front frame 13, and the leader 6 can be tilted back and forth and right and left by extending and contracting the stays 15a and 15b.

[0017]

According to the present invention, the leader 6 can be moved up and down by moving the front frame 13 up and down by extending and retracting the front frame up and down cylinder 16, and the stays 15a and 15b can be extended and contracted. Thus, the leader 6 can be tilted in any direction of front, rear, left and right, so that the working radius, the mounting height of the leader, and the tilting direction can be greatly increased, and the working range can be expanded. The size of the excavating tool 11 such as an auger can be easily selected, and the height and diameter of the tool can be increased.

[Brief description of the drawings]

FIG. 1 is an overall side view of an excavator provided with a leader support device of the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is an operation explanatory view.

FIG. 4 is a side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lower frame 3 Upper frame 6 Leader 10 Keriva 11 Drilling tool 12 Rotary drive device 13 Front frame 14 Head 14a Universal joint 15a, 15b Stay 16 Front frame undulating cylinder 17 Thrust cylinder

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 15/00 E21B 15/04

Claims (1)

(57) [Claims] 1. A front frame (13) is pivotally attached to the front of an upper frame (3) of a main body (1) so as to be undulating, and a universal joint (14a) is provided at a front end of a head (14) of the front frame (13). Tilt forward and backward through
The left and right sides of the head (14) are pivotably connected to the lower rear surface of the reader (6), and the lower ends are pivotally connected to the left and right rear portions of the upper surface.
The upper ends of the pair of stays (15a) (15b) are pivotally attached to the substantially central rear surface of the reader (6), and the left and right stays are
-(15a) and (15b) by hydraulic cylinders
An excavator leader support device, which is individually extendable and retractable, and further comprises a front frame undulating cylinder (16) disposed between a rear portion of the head (14) and a rear portion of the upper frame (3).