JP3404680B2 - Drilling direction correction device for excavating work rod in excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating work rod correcting device for an excavating machine having an excavating work rod such as a screw auger or a stirring rod. 2. Description of the Related Art Conventionally, for example, in an auger excavator in which a leader mast is vertically supported by a crawler and an upper end of a screw auger is connected to a rotation drive unit such as a motor supported to be movable up and down by the leader mast, When the excavation direction of the screw auger is bent due to boulders or changes in the stratum in the ground while excavating a vertical vertical hole in the ground by rotation of the screw auger, after raising the screw auger to a required height, There is known a method of inclining the leader mast or moving the crawler in accordance with the bending direction and the bending angle to perform the excavation of the screw auger again. [0003] However, the above-mentioned conventional method has problems that not only is the operation large-scale and involves danger, but also the correction of the excavation direction is inaccurate. An object of the present invention is to eliminate the conventional disadvantages. [0004] As means for solving the above-mentioned problems, the present invention raises and lowers a hollow excavation work rod to which rotation is transmitted from a rotation drive unit to a work rod supporter standing on the ground. In the excavator freely supported, the excavating head is connected to the lower end of the excavating work rod so as to swing freely in a universal direction about an extension of the axis of the excavating work rod, and excavation is performed on the axis of the excavating head. The head support rod is rotatably vertically passed, the swing operation rod is rotatably inserted into the hollow of the excavation work rod, and the lower end of the swing operation rod and the upper end of the excavation head support rod,
A drive means for vertically rotating the swing operation rod, and a drive means for rotating and rotating the swing operation rod, the drive means being connected to be capable of transmitting rotation through a swing operation mechanism for swinging the excavating head by vertical movement of the swing operation rod, An excavation work rod direction correction device for an excavator is proposed. In the present invention, the term "digging work rod" refers to a screw auger having a continuous screw blade on the outer peripheral surface of a rod, a stirring screw having a discontinuous screw blade, a stirring blade, a cutter blade, and the like on the outer peripheral surface of the rod, and various other types. Includes a work rod for performing work. In addition, a cam mechanism such as a groove cam, a link mechanism, and other various mechanisms are used as the "swinging operation mechanism". Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a mast (2) connected to a front end of a crawler (1) is vertically supported as a working rod support in this embodiment, and is laid over the entire length of the mast (2). The drive unit box (4) is vertically slidably engaged with the guide rails (3), (3) through the slide fittings (5)..., And the wire rope (7) hanging down from the top sheave (6). ), The box (4) is hung up and down freely, and a hollow screw auger (9) is attached to a hollow rotary drive shaft (8) protruding from the lower surface of the drive unit box (4).
Is connected to the screw auger (9), and a drilling head (10) is attached to a lower end of the screw auger (9). A device for correcting the direction of excavation of a screw auger in an excavator as described above will be described. At the lower end of the hollow shaft of the screw auger (9), an annular socket (11) having an annular concave spherical seat on the inner peripheral surface as shown in FIG.
With its axis centered on the axis of the screw auger (9) with bolts (12)... In the annular socket (11) having an annular convex surface on the outer peripheral surface and having an axial center. A disk-shaped rotor (13) provided with a shaft hole (14) is rotatably fitted to form a universal spherical bearing, and the rotor (13) of the bearing has a shaft hole (16) at the shaft center. With the head axis (15) aligned with the axis,
Bolt (17), Nut (18) through flange
And the excavating head support rod (19) is freely rotatable and axially extended in such a manner that the upper end of the excavating head supporting rod (19) is appropriately protruded from the shaft holes (14) and (16) of the rotor (13) and the excavating head shaft (15). It is inserted so that it cannot slide. The non-slidable structure in the axial direction comprises a bearing (20) contacting an intermediate step of the support rod (19) and the bearing (2).
0) and the bearing nut (2
1). In such a drilling head support structure, when the upper end of the support rod (19) protruding into the screw auger hollow shaft is inclined in an arbitrary direction, the rotor (13) rotates in the socket (11) to excavate. The entire head (10) is swung in that direction. As shown in FIG. 4B, the inner circumferential surface of the socket (11) of the spherical bearing has an engaging groove (2) in the generatrix direction.
2) and (22) are recessed, and keys (23) and (23) are slidably engaged in the engagement grooves (22) and (22) on the outer peripheral surface of the other rotor (13). With the key engagement, the rotation of the screw auger (9) causes the drilling head (1) to rotate from the socket (11) via the rotor (13).
0). The swing drive of the excavating head (10) is as follows. A number of bearings (24) are installed at the axial position in the hollow shaft of the screw auger (9), and these bearings (24)... ) Is rotatably and slidably supported in the axial direction, and the lower end of the rod is extended to the upper end of the excavating head support rod (19).
5) The lower end is formed in a forked shape, and the auxiliary plates (26), (27), (27) are welded to the forked portion to form a U-shaped cross section as a whole as shown in FIG. The supporting rod (19) is formed in a flat plate shape, and an auxiliary plate (30) is formed on one end of the plate portion (29).
Are welded at right angles to form a T-shaped joint (31), and a screw auger (9) is attached to the plate-like portion (29).
The grooved cam (32) is formed of a short upper groove extending on the axis of the upper groove, and a lower inclined groove extending from the lower end of the upper groove and appropriately inclined and extending downward.
The plate-shaped portion (29) of the U-shaped joint (31) is
8) and inserted into the U-shaped groove and the cam operation pin (3
3) penetrates the U-shaped side walls and is engaged in the groove cam (32). Therefore, the swinging operation rod (2
5) is pushed downward from the position shown in FIG. 2, the cam operating pin (33) moves downward in the groove cam (32) and pushes the lower inclined groove portion, whereby the excavating head support rod (19) is moved.
Is tilted with the spherical bearing as a fulcrum, and accordingly the entire excavating head (10) is tilted in the same direction as the tilt of the groove cam (32) as shown in FIG. The drilling head (1
When the swinging operation rod (25) is rotated in the inclined state of (0), the excavation head support rod (1) is rotated.
9) performs a grinding motion, and the excavating head (10) turns in an arbitrary direction. The rotation driving means of the screw auger (9) is as follows. In FIG. 5, bearings (35), (5), (5), (5), wherein the hollow rotary drive shaft (8) penetrates vertically through the housing (34) through a gear housing (34) provided continuously below the drive unit box (4). The drive shaft (8) is rotatably suspended through the lower end of the drive shaft (8), the upper end of the screw auger (9) is connected to the lower end of the drive shaft (8), and the large gear (36) is fixed to the outer peripheral surface of the drive shaft (8). , The gear (3
6), a small gear (3) fixed to the output shaft of the motor (37).
8) is engaged. Next, a description will be given of the lifting drive means and the rotation drive means of the swinging operation rod (25). The upper end of the swinging operation rod (25) is extended into the hollow drive shaft (8), and a shaft (39) having a spline shaft portion (40) at the extended end is connected so that the axes thereof are aligned with each other. A hydraulic cylinder (41) for lifting and lowering the upper end of the shaft (39) at the upper part of the box (4) with a rotary hanging bracket (48)
Ram (42). On the other hand, on the gear housing (34),
The auxiliary gear housing (4) surrounding the spline shaft (39)
3) is installed, a spline gear (44) having a spline hole (45) in the center is rotatably supported in the housing (43), and the spline hole (45) of the spline gear (44) is placed in the housing (43). The small gear (47) fixed to the output shaft of the motor (46) is engaged with the gear (44) by engaging with the spline shaft (40). The spline shaft (39), the swinging operation rod (25), and the excavating head support rod (19) each have a chemical solution supply hole vertically penetrated through the axis thereof.
9) A chemical injection pipe (50) is connected to the upper end via a swivel joint (49), and a chemical injection port is provided at the lower end of the support rod (19). Reference numeral (51) denotes a flexible connection pipe that connects the lower ends of the operation rod (25) and the respective chemical liquid supply holes at the upper end of the support rod (19) outside the rod. The operation of the above example will now be described. Motor (3
7), the rotation is transmitted to the drive shaft (8) and the screw auger (9) via the gears (38) and (36), and further, the socket (1) is inserted from the lower end of the screw auger.
1) The rotation is also transmitted to the excavating head (10) via the rotor (13), and the rotary screw auger (9) is lowered to start excavating a vertical vertical hole into the ground. Bending angle detector (52) provided in screw auger (9) (FIG. 2)
Screw auger (9) which exceeds the allowable range
Is detected, first, the screw auger (9) is pulled up while reversing to a position before the bend occurs. Next, the rotation of the screw auger (9) is stopped (or while it is being rotated), and the lifting hydraulic cylinder (4
The swinging operation rod (25) is lowered via the spline shaft (39) by the extension drive of (1), and the excavation head (1) is operated by the action of the groove cam (32) and the cam operating pin (33).
0) is inclined by a required angle. In that state, the motor (46)
Gear (47), spline gear (44),
Swing operation rod (25) via spline shaft (39)
Is rotated appropriately to turn the excavating head (10) in the inclination correction direction. In this state, the screw auger (9) is rotated to restart the excavation. When the excavation direction returns to the normal direction, the swinging operation rod (25) is raised by the contraction drive of the elevating cylinder (41), and the excavating head (10) is screwed by the cam action in the reverse order to the above procedure. The excavation is continued by returning to the axis of (9). According to the apparatus for correcting the excavation direction of the excavating work rod in the excavator according to the present invention, the correction operation can be performed easily and safely, and the correction of the excavation direction can be performed accurately. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an excavator. FIG. 2 is an enlarged vertical sectional view of a lower end portion of the screw auger. FIG. 3 is an enlarged partial cutaway front view of the same with the excavating head tilted. FIG. 4A is a sectional view taken along the line AA of FIG. 2; (B) It is a BB cut end view of FIG. FIG. 5 is an enlarged vertical sectional side view of a drive unit box portion. [Description of Signs] 2 Mast 9 Hollow screw auger 10 Drilling head 11 Annular socket 13 Disk-shaped rotor 19 Drilling head support rod 25 Swing operation rod 32 Cam actuation pin 33 Groove cam 39 Spline shaft 41 Hydraulic cylinder 44 for elevating and lowering Spline gear 46 Motor 47 Small gear

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Junichi Akita 1-13-13 Awaza, Nishi-ku, Osaka-shi, Osaka Naruyuki Kogyo Co., Ltd. (72) Inventor Etsuo Hirakawa 1293, Adocho, Hanamigawa-ku, Chiba-shi, Chiba (56) References JP-A-59-80887 (JP, A) JP-A-1-43694 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 7/04-7/10 E21B 10/44 E21B 17/00-17/22

Claims (1)

(57) [Claims] [Claim 1] A work rod supporter standing on the ground,
An excavator in which a hollow excavating work rod to which rotation is transmitted from a rotation drive unit is supported so as to be able to move up and down, wherein the excavating head is swung at a lower end of the excavating work rod in a universal direction about an extension of the axis of the excavation work rod. Rotatably connected, a drilling head support rod is vertically rotatably passed through the axis of the drilling head, a swinging operation rod is rotatably inserted into the hollow of the drilling work rod, and a lower end of the swinging rod is provided. And the upper end of the excavation head support rod are connected so as to be able to transmit rotation via a swing operation mechanism that swings the excavation head by vertically moving the swing operation rod, and a drive that moves the swing operation rod up and down. An excavating work rod correcting device for an excavator, comprising: