JP3076264B2 - Drilling rig lifting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting mechanism for raising and lowering a drilling device for drilling a deep hole such as a pile driving hole along a leader.

[0002]

2. Description of the Related Art As shown in FIG. 6, a lifting and lowering mechanism of this type of excavator has a cylindrical shape attached to the tip of a front bracket (2) protruding from the front of a swivel (12) of a self-propelled vehicle (1). Leader support (50)
The mounting portion (57) protruding from the back surface of the reader (5) is mounted on the reader supporting portion (50). In the following description,
This is the direction in which the front bracket (2) projects. Reader (5)
A total of five sprockets (500) (501) (502) (503) (504) are provided, one at the upper and lower ends and three at the middle.
(8) is stretched endlessly. Upper and lower sprockets (50
0) (501) are the three intermediate sprockets (502) (503) (504)
Three sprockets (502) located in front of and in the middle
Of the (503) and (504), the central sprocket (504) is located at the rearmost side, and the motor shaft of the hydraulic motor (4) is connected to the sprocket.

[0003] The chain (8) has a top sprocket (50).
From 0), the lowest sprocket (501) and the middle three sprockets (503), (504), (502) meanderingly pass to the first sprocket (500). An excavator (9) slidably attached to the leading edge of the reader (5) is connected to the chain (8), and the excavator (9) is driven by the hydraulic motor (4) to drive the chain (8). Down or up.

[0004]

The above-mentioned conventional excavator lifting mechanism has five sprockets (500) (501) (502) (503) (504) for extending the chain (8) endlessly. Since all of them are provided in the vertically elongated hollow leader (5), the width L1 before and after the leader (5) becomes large. Accordingly, the distance L2 from the turning center P1 of the swivel base (12) to the front surface of the reader (5) becomes longer, and accordingly, the distance from the turning center of the swivel base (12) to the turning center of the excavator (9) becomes longer. As a result, there is a disadvantage that the turning radius R1 of the excavator (9) becomes large and a small turn is not effective. The present invention clearly discloses an excavator lifting / lowering drive device capable of reducing the turning radius of the excavator by retreating the positions of a driving sprocket and a hydraulic motor for driving the excavator elevating / lowering chain to be positioned above the front bracket. It is to be.

[0005]

The lifting mechanism of the excavator according to the present invention has a hollow mounting portion (51) for mounting to a front bracket (2) projecting from the front of a swivel (12). And a sprocket provided at the upper and lower ends of the leader (5).
(73) (74) and a chain (8) to be extended endlessly via a drive sprocket (42) connected to the hydraulic motor (4) and to be connected to the excavator (9). In the excavator raising / lowering mechanism, the hydraulic motor (4) and the driving sprocket (42) are provided on the mounting portion (51) of the leader (5), and are located above the front bracket (2).

[0006]

[Operation and Effect] The drive sprocket (42) is not accommodated in the leader (5) but is retracted to the position above the front bracket (2). Can be reduced. This makes it possible to reduce the turning radius R1 from the rotation center P1 of the swivel table (12) of the excavator (9) which is attached to the front part of the leader (5) so as to be able to move up and down. Can be improved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on an example of an excavator suitable for excavation under a pedestrian bridge, a bridge girder, an overpass, in a tunnel, or in a low space where the height is limited indoors. I do. As shown in FIG. 1, the excavator mounts a turntable (12) on a self-propelled carriage (11) operated by remote control, and moves a front bracket (2) forward from the turntable (12). It is protruding. On the front bracket (2), a reader (5) can be tilted forward and backward and left and right, and a turntable (3) provided at an end of the front bracket (2) is rotatably provided as a rotation center P2. An excavator (9) is provided at the front of the reader (5) so as to be able to move up and down. leader
(5) is configured to be slightly shorter than the height of the work space, and can be extended as needed as described later. Drilling equipment (9)
Can make a large turn around the center of rotation P1 of the turntable (12) as a radial center, and can make a small turn around the center P2 of the turntable (3) on the front bracket (2) as a radial center.

As shown in FIG. 2, a front bracket (2)
Are two arms (2) projecting from the swivel (12) (see FIG. 1).
1) A flat support (22) is provided at the tip of (21). Support stand (2
2) is an upper plate (23) and a lower plate (24) each having a semicircular front part.
Are formed by connecting an arc-shaped front plate (25) and a rear plate (26), and the front ends of the arms (21) and (21) are connected to the rear plate (26). Openings (27) for mounting a cylinder (29) described later between the front plate (25) and the rear plate (26) are provided on both side surfaces of the support base (22).

A turntable (3) is provided on the support (22).
The turntable (3) is formed by fixing a mounting plate (31) to the upper end of a short cylindrical body (32) rotatably penetrating the center of the upper plate (23) of the support base (22). ), The rotation support shaft (34) is supported rotatably in the front-rear direction, and brackets (35) (35) on both left and right sides
Is protruding. The support arms (28) protruding on both sides of the front bracket (2) and the cylinder (32) of the turntable (3) are connected by cylinders (29) and (29). The turntable (3) rotates.

The turntable supported by the rotation support shaft (34)
A swing table (33) is provided above (3) so as to swing in the left-right direction. The hydraulic motor (4) is mounted on the rocking table (33) by the motor shaft (40).
Are arranged in the left-right direction, and a wall plate (39) is protruded upward to face the motor shaft (40). Brackets (36) and (36) project from the casing (41) and wall plate (39) of the hydraulic motor (4) in the same direction as the brackets (35) and (35) on the turntable (3). Cylinder between brackets (35) (36) and (35) (36)
(37) Connected by (37). By extending the piston rod of one cylinder and contracting the piston rod of the other cylinder, the swing table (33) swings left and right about the rotation support shaft (34) with respect to the turn table (3). I do.

A reader (5) is mounted on a swing table (33) so as to be swingable in the front-rear direction about a motor shaft (40). leader
(5) is composed of a support (6) on a swing table (33) and a reader main body (7) slidably mounted on the support (6). The support (6) has two parallel vertical plates (63) (63) on the back of the vertically long guide plate (62) over the entire length of the guide plate (62).
Arm plate (61) (6) facing rearward at the upper end of the vertical plate (63).
It is formed by projecting 1). The distal end side of the arm plates (61) (61) is a mounting portion (51) for mounting on the swing table (33), and the mounting portion (51) is attached to the motor shaft (4) of the hydraulic motor (4).
0) rotatably penetrates the arm plate (61) (6) on the motor shaft (40).
The drive sprocket (42) is mounted between 1). Positioned sprockets (65) and (66) are provided at the upper end between the vertical plates (63) and (63) of the support (6) and below the upper end.

The tip of the mounting portion (51) of the support (6) and the tip of the rotary support shaft (34) are connected by a cylinder (53), and the support (6) is moved by the operation of the cylinder (53). It is swingable about the motor shaft (40) in a plane including the axis of the rotation support shaft (34). As shown in FIG. 4, a cylinder (64) is provided vertically below the support (6) between the vertical plates (63) and (63).
(64) The footrest (68) is attached to the downward piston rod,
The posture of the reader (5) can be stabilized by grounding the footrest (68) by projecting the piston rod.

The leader main body (7) is a vertically long rod having a substantially U-shaped cross section, and is formed to be slightly longer than the length of the guide plate (62) of the support (6). The reader main body (7) has the longitudinal opening facing forward, and the guide grooves (71) (71) on both sides of the rear end are supported.
It is slidably fitted on both side edges of the guide plate (62) of (6). The leader body (7) pivotally supports sprockets (73) and (74) at the upper and lower ends in the groove (70). Support (6) and leader
A chain (8) is stretched endlessly over the five sprockets (42), (65), (66), (73) and (74) of (7).

The chain (8) comprises a sprocket (74), a fixed sprocket (66), a driving sprocket (42) and a fixed sprocket (42) below the sprocket (73) at the upper end of the leader body (7). The first sprocket (73) is reached in the order of 65). Guide posts (72) and (72) project from the entire length of the opening edge of the groove (70) of the leader main body (7), and the excavator (9) can slide on the guide posts (72) and (72). Attached, the chain (8) and the drilling device (9) are detachably connected.

A bracket (67) provided at the upper end of the vertical plate (63) of the support (6), and a receiving stand (7) provided at the lower end of the reader main body (7).
5) is connected by a cylinder (54).
When the piston rod (55) of (54) is extended, the leader is
(7) and the support (6) have the same upper end height, as shown in FIG.
When the piston rod (55) is contracted, the leader body (7) rises from the upper end of the support (6) in accordance with the contraction of the piston rod (55). Even if the leader (7) rises,
Because the length of the circuit of (8) is the same, the chain (8)
There is no looseness or tension, and there is no hindrance to the rotation of the chain (8).

The excavator mounted on the reader (5)
(9) has a radius R around the rotation center P1 of the swivel table (12).
₁ Large pivotable, also the front bracket (2) tip turntable (3) is possible small turning radius R ₂ a rotation center P2 as the center of. The hydraulic motor (4) is operated, and the excavator (9) is lowered by the chain drive to dig a hole.

A chain for raising and lowering the excavator (9)
In the group of sprockets in which (8) is stretched endlessly, the driving sprocket (42) is retracted from the leader (5) until it is positioned above the front bracket (2), that is, the leader
Since it is not necessary to accommodate the driving sprocket (42) in (5), the length before and after the leader (5) can be reduced by that much,
Therefore, the turning radii R1 and R2 of the large turning and the small turning of the excavator (9) can be reduced, and thus the excavating workability can be improved by making the turning smaller than before.

With respect to the reader (5), the inclination of the bogie (11) can be adjusted in the left and right directions by the operation of the cylinders (37) and (37) and in the front and rear directions by the cylinder (53). Even if is not horizontal, the leader (5) can be held vertically, so that a vertical hole can be dug by the excavator (9).

As shown in FIG. 4, by operating the cylinder (64), the leader body (7) is raised, and the excavated portion of the excavator (9) is extended downward, so that a deep hole can be dug. As shown in FIG. 5, an auxiliary reader (55) is connected above the reader main body (7) of the reader (5), and the drilling rig (9) is further extended downward to dig a deeper hole. it can. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a side view of an excavator equipped with a low-space reader according to the present invention.

FIG. 2 is a perspective view of the excavator lifting mechanism according to the present invention.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of a state where a leader main body is raised.

FIG. 5 is a side view showing a state where an auxiliary reader is connected to the reader.

FIG. 6 is a side view of a conventional example.

[Explanation of symbols]

 (12) Swivel (2) Front bracket (4) Hydraulic motor (42) Drive sprocket (5) Leader (51) Mounting part (6) Support (65) (66) (73) (74) Sprocket (7) Leader (8) Chain (9) Drilling rig

Claims (4)

(57) [Claims] 1. A hollow mounting portion (51) for mounting to a front bracket (2) protruding from a front portion of a swivel base (12) is protruded from a rear surface, and a drilling device (9) is mounted on a front portion. Endless through a leader (5) that can be mounted to be able to move up and down, and sprockets (73) (74) provided at the upper and lower ends of the leader (5) and a driving sprocket (42) connected to a hydraulic motor (4). Stretched drilling rig
In an excavator raising / lowering mechanism constituted by (9) and a chain (8) to be connected, a hydraulic motor (4) and a driving sprocket (42) are connected to a leader (5).
On the mounting part (51) of the front bracket (2)
The lifting mechanism of the drilling rig that is located above. 2. The reader (5) is attached to the front bracket (2) so as to be adjustable in front, rear, left and right directions.
The lifting device of the excavating device according to claim 1. 3. The reader (5) includes a front bracket (2).
The elevating device for an excavator according to claim 1 or 2, wherein the elevating device is attached to the bracket so as to be rotatable around the bracket. 4. The leader (5) includes a front bracket (2).
A support (6) mounted on a vehicle and having an elongated guide plate (62)
And a reader body disposed on the support (6) so as to be movable up and down.
(7), the sprockets (73) and (74) are provided at the upper and lower ends of the leader body (7), and the hydraulic motor (4), the driving sprocket (42) and the drive are mounted on the support (6). Two upper and lower fixed position guide sprockets (65) and (66) are provided between the sprocket (42) and the upper and lower sprockets (73) and (74), and the chain (8) is a leader main body (7). From the upper end sprocket (73) to the first sprocket (73) via the lower sprocket (74), the lower fixed sprocket (66), the driving sprocket (42), and the upper fixed sprocket (65) in this order. A hydraulic cylinder (54) for raising and lowering the reader main body (7) with respect to the support body (6) is provided between the leader main body (7) and the support body (6). 3. The elevating mechanism of the excavator according to any one of 3.