JP2596520Y2 - Drilling rod coupling device in excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating rod connecting device for excavating a screw auger, a casing auger, and other excavating members (hereinafter collectively referred to as excavating rods) in an excavator. .

[0002]

2. Description of the Related Art Heretofore, as an excavator for performing excavation work by adding such excavation rods, for example, Japanese Patent Publication No. Sho 63-5
No. 6398 is disclosed. In this excavator, the upper end of a drilling rod is automatically connected to an output shaft of a drive unit that is supported by a tower so as to be able to move up and down.

[0003]

However, as shown in FIG. 1, an excavating hopper 3 is provided below the driving unit 1 so that the excavating rod 2 is inserted therethrough. When the apparatus of the above-mentioned publication is applied to a so-called Nakahori machine having a structure for discharging excavated earth and sand from the mouth 4, FIG.
When reconnecting the excavation rod 2 after completing the work for one pile (excavation rod) as in
Is located above the discharge hopper 3 by the height of the discharging hopper 3, and the attaching / detaching work of the connecting portion 5 is a work at a high place, resulting in poor workability and danger. And it is difficult to apply the present invention to an excavator equipped with this type of unloading hopper 3.

In view of the above, the present invention provides a connecting device for excavating rods, which can easily add excavating rods even in an excavator having an obstructing member such as an unloading hopper at a lower portion of a driving unit. It was made for the purpose of providing.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a method in which a drilling rod is connected to a drive unit which can move up and down along a tower, and the drilling rod is driven to rotate. In an excavator for drilling a pit in the ground, an inner rod that is connected to the output shaft of the drive unit and hangs down, and is externally fitted non-rotatably and axially slidably to the inner rod and attached to the drive unit. An outer rod having a length that is suspended and supported by a cylinder and penetrates an auxiliary member such as an earth discharging hopper, and a lower end of the inner rod is provided with a female joint portion for excavating rod connection. A lock member that is removably engageable with a lock groove of a male joint portion of the excavating rod is provided so as to be able to protrude and retract in a radial direction thereof, and an upper taper surface and a lower taper surface are formed at a lower end portion of the outer rod. The material includes a tapered surface which engages with the downward tapered surface of the outer rod when the outer rod is lowered to apply an inward thrust to the locking member, and a locking member which engages with the upward tapered surface when the outer rod is raised. The lock member is provided with a tapered surface for giving a thrust outward, and this lock member is made to protrude and retract in conjunction with the vertical movement of the outer rod.

[0006]

When the excavation by one excavation rod is completed, the outer rod is pulled up to unlock the lock member, the lock member is pulled out, the drive unit is raised, and the excavation rod to be added is suspended under the drive unit. The part is lowered and added to the female joint part of the inner rod, and the male joint part at the upper end of the rod is fitted. At this time, the lock member is at the retracted position, and the inner end thereof is submerged from the inner surface of the female joint. When the outer rod is lowered by the cylinder after fitting the two joints, the downward tapered surface of the lower end engages the corresponding tapered surface of the lock member, and the lock member advances toward the center, and the male joint portion And the two joints are joined together. When disengaging, raising the outer rod causes its upwardly tapered surface to engage with the corresponding tapered surface of the lock member, causing the lock member to move outward, separate from the outer rod, and withdraw.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

[0008] The excavator in this embodiment is the same as that shown in FIG.
This excavator is provided with an inner rod shown in FIG. 3 on an output shaft 8 of a drive unit 1 which can move up and down along a tower 7 erected on a work machine 6 as shown in FIG. 9
The outer rod 10 having a required length is externally fitted to the inner rod 9 by a spline 11 so as to be non-rotatable and slidable in the axial direction. The outer rod 10 is suspended and supported by the drive unit 1 via cylinders 12 and 12. The drive unit 1 is suspended by a wire rope 14 passing through a sheave 13 at the upper end of the tower 7, and the wire rope 14 is hoisted and lowered by a winch 15 on the working machine 6. Reference numeral 16 denotes a stay.

Below the drive unit 1, an excavating hopper 3 is provided so as to be inserted into the excavating rod 2 and supported by the tower 7. The lower end of the outer rod 10 protrudes slightly from the lower end of the excavating hopper 3. It has the length to be.

At the lower end of the inner rod 9, there is provided a female joint 17 as shown in section in FIG.
7, two lock members 18 are provided so as to be able to protrude and retract in the radial direction. In the illustrated embodiment, the positions where the left and right locking members 18 are provided are vertically stepped so as to prevent a decrease in strength due to a decrease in the cross-sectional area of the portion. It may be provided as a level.

At the upper end of the excavating rod 2 'to be added, a male joint 19 is provided.
7 are fitted as closely as possible to the lock members 18 and 18 when the female joint 17 is completely fitted.
Lock grooves 20, 20 are formed of concave portions that are aligned with the inner ends of the grooves.

The lock member 18 has a head 18a,
The portion of the female joint portion 17 to be inserted into the peripheral wall portion 17a is a flat plate portion 18b, and a small diameter portion 18c is provided between the flat plate portion 18b and the head portion 18a. Is formed as an upward tapered surface 18d.

At the lower end of the outer rod 10, the small diameter portion 1
8c and a portion corresponding to the tapered surface 18d of the flat plate portion 18b is aligned with the downward tapered surface 10
a is formed, and the tapered surface 10a of the lock member 18 is formed by the tapered surface 10a when the outer rod 10 is lowered.
The lock member 18 is formed so as to be pushed in the axial direction of the excavating rod 2 by pressing d.

The pulling out of the lock members 18, 18 is also performed by vertically moving the outer rod 10. That is, the outer cylindrical portion 21 is fitted around the outer periphery of the lower end of the outer rod 10 at an interval, and is fixed to the outer rod 10 at the upper end thereof with the bolts 22. The inner cylinder body 23 is inserted between the inner cylinder bodies so as to be slidable in the axial direction.

The lock members 18, 18 are connected to the outer cylinder 21,
The inner cylindrical body 23 penetrates the peripheral wall 17 a of the female joint portion 17, and the lock member 18 interferes with the upward tapered surface 21 a of the lower end of the outer cylindrical body 21 when the outer rod 10 is raised, and pulls out the lock member 18. It has a tapered surface 18e for moving in the direction.

Therefore, when the excavation by one excavating rod 2 is completed, the outer rod 10 is pulled up, the lock members 18, 18 are unlocked, the lock member is pulled out, and then the drive unit 1 is pulled up, and the splicing section is provided thereunder. The drilling rod 2 'to be added is suspended, the drive unit 1 is lowered, and the male joint 1 of the drilling rod 2' on the side to be added to the female joint 17 of the inner rod 9 is added.
When the outer rod 10 is lowered by the cylinders 12 after the fitting of the lock members 9, the tapered surfaces 10 a at the lower ends thereof sequentially contact the tapered surfaces 18 d, 18 d of the lock members 18, 18, and are pushed in. The ends of the joints 18 and 18 are fitted into the lock grooves 20 and 20 of the male joint 19 so that the two joint members 17 and 19 are connected.

Accordingly, the work related to the connecting portion 5 including the work of pulling out the lock members 18 and 18 is at the lower position of the earth discharging hopper 3 as shown in FIG.

To release the locked state, the outer rod 10 is pulled up, and the lower end thereof has an upward tapered surface 21a.
Interferes with the tapered surfaces 18e of the lock members 18 and 18 so that the lock members 18 and 18 slide outward due to the sliding contact between the tapered surfaces. .

Therefore, the lock members 18 can be locked and unlocked by the vertical movement of the outer rod 10.

The obstructing member is not limited to the dumping hopper, but may be Monken, but the present invention can be applied to such a case.

[0021]

As described above, according to the present invention, even if the excavator is provided with a member such as an unloading hopper at the lower part of the driving unit, the replenishment of the excavating rod is performed by the unloading hopper. Can be performed at a portion protruding from the lower part of the work, so that the connection and disconnection work is performed at a position lower by the height of the discharging hopper, and the workability is significantly improved and safety can be enhanced. Further, since other power is not required for connecting the excavating rods and can be performed only by the vertical movement of the outer rod, the structure can be obtained simply and inexpensively, and the connecting portion can be made compact. In particular, a lock member for connecting or disconnecting the excavation rod is provided so as to be able to protrude and retract in the radial direction, and the advancing and retreating of the lock member is provided at the lower end of the outer rod with an upward taper surface and a downward taper surface, and a taper surface formed on the lock member , And there is no unstable element such as one that is retracted by a spring, so that the reliability of the connecting and disconnecting operation of the excavating rod can be significantly improved.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an example of an excavator to which the present invention is applied.

FIG. 2 is a partially enlarged front view showing the excavation rod part.

FIG. 3 is a cross-sectional view of the female joint portion of the connecting portion.

FIG. 4 is a horizontal cross-sectional view showing a lock member portion, the right side showing a locked state, and the left side showing a unlocked state.

FIGS. 5A and 5B are explanatory diagrams showing problems of the related art.

FIG. 6 is an explanatory view showing advantages of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive part 2, 2 'Excavation rod 3 Discharge hopper 6 Work machine 9 Inner rod 10 Outer rod 10a Downward taper surface 12 Cylinder 17 Female joint part 18 Lock member 18d, 18e Taper surface 19 Male joint part 20 Lock groove 21 Outer cylinder Body 21a Upward tapered surface

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Isamu Yamanoi 1293, Tento-cho, Hanamigawa-ku, Chiba-shi, Chiba Sanwa Equipment Co., Ltd. Chiba Plant (56) References JP-A-4-281985 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 17/02

Claims (1)

(57) [Scope of request for utility model registration] An excavator in which an excavating rod is connected to a drive unit which can move up and down along a tower, and which drills a vertical hole in the ground by rotating the excavation rod. The excavator is connected to an output shaft of the drive unit. An inner rod that is suspended and hangs on the inner rod so as to be non-rotatable and slidable in the axial direction, has a length that is suspended and supported by a drive unit by a cylinder, and penetrates an auxiliary member such as an earth removal hopper. An outer rod, and a lower end of the inner rod is provided with a female joint for connecting a drilling rod, and the female joint has a lock member capable of engaging and disengaging from a lock groove of a male joint of the drilling rod. The lower end of the outer rod has an upward tapered surface and a downward tapered surface, and the lock member engages with the downward tapered surface of the outer rod when the outer rod descends. A taper surface for applying an inward thrust to the material, and a taper surface for engaging the upward taper surface when the outer rod rises to apply an outward thrust to the lock member; A coupling device for excavating rods in an excavator, characterized in that the excavating rod moves in and out in conjunction with the vertical movement of the excavator.