JP2003269065A - Drill head swinging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill head swinging apparatus which has a simple structure and automatically carries out withdrawal of a drill head from an excavation line. <P>SOLUTION: The drill head swinging apparatus is for use in withdrawing the drill head 8 from the excavation line K, and comprised of a swing table 22, a driving means 23, a guide means 29, a guide bracket 24, and a guide roller 27. The swing table 22 has the drill head 8 mounted thereon, and is borne by a slide table 21 in a manner moving in a direction away from the excavation line K and rotating at an edge of the movement. The driving means 23 moves the swing table 22. The guide means 29 is formed of a guide long hole 25 and a guide pin 26 and arranged at a location between the slide table 21 and the swing table 22. The guide bracket 24 includes a linear portion 24a extending in a swing table 22 moving direction, and an arcuate portion 24b, and it is arranged on the slide table 21. The guide roller 27 is arranged on the swing table 22 so as to travel between the linear portion 24a and the arcuate portion 24b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a drill head swing device for an excavator.

[0002]

2. Description of the Related Art An excavator excavates a drill hole having a predetermined diameter by rotating and / or vibrating the drill rod while the drill head grips the drill rod having a bit at its tip. When conducting a geological survey or ground survey,
In addition to excavation, it is necessary to sample soil from inside the excavation hole. In addition, for steel pipe sheet piles, etc., it is necessary to drop them into the excavation hole after excavation. In such a case, it is preferable in terms of efficiency to leave the excavator as it is, retract only the drill head from the excavation line, and perform these operations using the excavator in the retracted state of the drill head.

Conventionally, retraction of such a drill head is performed by an operator manually or automatically by using a cylinder or the like.

The manual type has a structure in which an operator moves the drill head to retract it from the excavation line, and locks the retracted drill head with bolts or the like to fix it. The automatic type has a structure that uses two systems of hydraulic circuits: a rotary actuator that retracts the drill head and a cylinder that fixes the drill head at the retracted position.

[0005]

However, in the structure in which the drill head is manually retracted, the retracting and locking work is not only troublesome due to heavy labor, but also has a problem with danger.

On the other hand, the structure for automatically retracting the drill head does not have such a problem, but since it requires two hydraulic circuits (drive systems), the structure is complicated and the control is complicated. And it has a troublesome problem.

The present invention has been made in consideration of such conventional problems, and it is possible to automatically retract the drill head and operate with a single drive system. It is an object of the present invention to provide a drill head swing device which is easy to control.

[0008]

In order to achieve the above object, a drill head swing device according to a first aspect of the present invention is a device for retracting a drill head moving up and down along an upright guide cell from the excavation line. A swing table that is attached to the slide head that moves up and down along the guide cell, and is supported by the slide table so as to move in a direction away from the excavation line and rotate at a moving end. A driving means for moving the swing table on the slide table, a guide slot provided between the slide table and the swing table and extending along the moving direction of the swing table, and the guide slot. Guide means consisting of guide pins slidably inserted and A guide bracket formed with a straight line portion extending along the moving direction of the swing table and an arc portion connected to the straight line portion; and provided on the swing table so as to travel between the straight line portion and the arc portion. When the guide pin reaches the moving end of the guide elongated hole by the driving of the driving means, the guide roller travels in the arc portion of the guide bracket with respect to the slide table. The swing table rotates around the guide pin to retract the drill head.

According to the first aspect of the invention, the swing table is moved in a direction away from the excavation line of the drill head by driving the driving means. At the time of this movement, the guide pin slides in the guide long hole, so that the guide pin can move stably. Further, at this time, since the guide roller travels on the straight portion of the guide bracket while rotating, the swing table can be moved with a small force.

When the swing table further moves and the guide pin reaches the moving end of the guide elongated hole, the guide roller reaches the arc portion of the guide bracket and rotates and travels along the arc portion. During this traveling, since the swing table rotates around the guide pin reaching the moving end, the drill head rotates together with the swing table.
By this rotation, the drill head is completely retracted from the excavation line. After that, the driving means stops driving,
This stop maintains the retracted state of the drill head.

In such an invention, since the retreat of the drill head from the excavation line is performed by driving the driving means, it is possible to automatically retreat, and manual work becomes unnecessary,
The drill head can be easily retracted.

At the moving end, the guide roller travels along the arc portion of the guide bracket, and along with this travel, the guide head rotates about the guide pin to retract the drill head from the excavation line. A long linear stroke to reach is unnecessary. Therefore, the structure for retracting can be downsized.

Further, since the drill head can be retracted only by driving a single driving means, the driving system can be simplified. Therefore, for example, when a cylinder is used as the driving means, the hydraulic circuit can be simplified and its control becomes easy.

The resetting of the drill head can be performed by the reverse operation of the driving means. First, if the drive means is reversely operated with the guide pin still at the moving end, only the guide roller travels in the opposite direction in the arc portion of the guide bracket while the guide pin remains at the moving end position. And reach the straight part. During this time, the drill head rotates with the swing table around the guide pin. afterwards,
When the reverse operation of the driving means is further continued, the guide roller moves in the reverse direction along the straight portion of the guide bracket, with the reverse movement of the guide pin in the guide elongated hole, and this movement causes the drill to move. The head returns to the excavation line,
The resetting is completed.

A second aspect of the present invention is the drill head swing device according to the first aspect, further comprising a lock mechanism for locking the swing table so that the drill head stops on the excavation line. To do.

By providing such a lock mechanism, the drill head can be positioned on the excavation line,
Since the drill head does not shift from the excavation line, excavation can be performed stably.

A third aspect of the present invention is the drill head swing device according to the first or second aspect, wherein the guide elongated hole is formed in the guide bracket.

As described above, by forming the elongated guide holes in the guide bracket, it is not necessary to separately provide them, and the structure can be made compact, the number of parts can be reduced, and the assembling can be facilitated. Become.

[0019]

1 to 3 show an embodiment of the present invention. FIGS. 1 and 2 show the entire excavator 1 to which this embodiment is applied, and FIG. 3 shows this embodiment. 2 shows the structure and operation of the drill head swing device 20.

As shown in FIGS. 1 and 2, the excavator 1 is
The crawler 3 is attached to the base 2 so that the crawler 3 can be self-propelled, and a control box 5 to which a plurality of operation levers 4 are attached is placed on the base 2. In addition, the base 2 is provided with an outrigger 6 which is pressed against the ground to ensure stability during excavation work.

A guide cell 7 which is in an upright state during excavation is attached to the base 2 so that it can be raised and lowered, and a drill head 8 is provided so as to be vertically movable along the length direction of the guide cell 7. From the upper end of the guide cell 7, the mast 9
Is erected. The mast 9 is, for example, for suspending an external member 10 such as a steel pipe sheet pile at a time other than excavation work, and has a pulley arm 11 having a pulley at its upper end and a winch 12 at its lower end. Is attached. The external member 10 is suspended via a connecting body 13 such as a rope or a wire that is hung around these, and the connecting body 13 is pulled out or wound up by the forward and reverse drive of the winch 12 to descend and To rise.

The drill head 8 is endless and moves up and down along the guide cell 7 by a transmission member (not shown) such as a chain or a wire arranged along the length direction of the guide cell 7. A lifting oil motor 15 is mounted on the guide cell 7 to operate the transmission member. A slide table 21, which is a component of the drill head swing device 20, is attached to the transmission member via a connector (not shown). The slide table 21 is moved up and down together with the operation of the transmission member by the drive of the lifting oil motor 15, and the drill head 8 is moved up and down by this lifting.

The drill head 8 is provided with a chuck 8a for holding an excavating rod (not shown) in the lower part, and an excavating oil motor 16 for excavating by rotating the chuck 8a and the excavating rod in the forward and reverse directions. ing. During excavation, the drill head 8 moves up and down along the excavation line K parallel to the guide cell 7. Further, the external material 10 also moves up and down along the excavation line K.

Next, the drill head swing device 20 of this embodiment will be described with reference to FIG.

FIG. 3 is a view seen from above with respect to the excavation direction, and the excavation line K is in the paper penetration direction.

A swing table 22 is supported on the side surface of the slide table 21, and the drill head 8 is attached to the swing table 22. Between the slide table 21 and the swing table 22, a hydraulic cylinder 23 (hereinafter, referred to as a cylinder 23) as a driving unit is provided.
Is said). The cylinder 23 is arranged below the swing table 22 in a state where both ends thereof are connected to the bracket 21a on the slide table 21 side and the bracket 22a on the swing table 22 side. Further, both ends of the cylinder 23 are pivotally supported by the brackets 21a and 22a, respectively, whereby the cylinder 23 can be tilted with respect to the slide table 21 as shown in FIGS. 3 (a) to 3 (c). Has become.

By driving the cylinder 23, the swing table 22 is movable with respect to the slide table 21 in a direction deviating from the excavation line K (rightward in FIG. 3). Guide means 29 is arranged in a direction away from the excavation line K.

The guide means 29 is the slide table 21.
Guide bracket 2 extending from one side (right side)
4 and a guide pin 26 provided on the swing table 22 so as to correspond to the guide elongated hole 25. Guide pin 26
Is fixed to the bracket 22b of the swing table 22.

The guide elongated hole 25 extends linearly in the direction in which the drill head 8 moves away from the excavation line K, and the guide pin 26 is slidably inserted in the guide elongated hole 25. Therefore, the guide pin 26 is replaced by the guide long hole 25.
By sliding the inside in the direction away from the excavation line K, the drill head 8 moves in the same direction as the swing table 22. Both end portions of the inner surface of the elongated guide hole 25 are formed in an arc shape having a diameter substantially the same as the diameter of the guide pin 26.

The guide bracket 24 extends from one side surface of the slide table 21 in a direction away from the excavation line K (rightward in FIG. 3). On the outer surface of the guide bracket 24, a straight line portion 24a linearly extending in a direction away from the excavation line K, that is, a moving direction of the swing table 22, and a circular arc portion 24b continuous from the end of the straight line portion 24a are formed. Has been done.

The arcuate portion 24b is formed so as to have substantially the same curvature as the guide pin 26, whereby the arcuate portion 24b and the guide pin 26 are concentric. Since the arc portion 24b and the guide pin 26 are concentric in this manner, the guide pin 26 can be smoothly rotated without rattling as the guide roller 27 travels along the arc portion 24b described later. It is possible.

A guide roller 27 is attached to the swing table 22 with respect to the guide bracket 24. The guide roller 27 is rotatably attached to the side surface of the swing table 22 facing the slide table 21. The guide roller 27 travels while rotating the linear portion 24a and the arc portion 24b formed on the outer surface of the guide bracket 24.

Further, the slide table 21 and the swing table 22 are provided with a lock mechanism 28. The lock mechanism 28 includes the lock claw portion 2 provided on the opposite side of the slide table 21 from the guide bracket 24.
8a, so that the swing table 22 has a similar position.
And the lock step portion 28b formed in the
8b enters into the lock claw 28a and engages with each other, so that the swing table 22 is locked so as to stop moving. In this lock, the drill head 8 has a drilling line K.
It is set to stop on.

FIG. 3A shows a state in which the drill head 8 is excavating, and in this state, the drill head 8 is stopped at a position corresponding to the excavation line K by the lock of the lock mechanism 28. . Therefore, the drill head 8
The excavation rod can be rotated, and excavation is performed by rotating the excavation rod.

FIGS. 3 (b) and 3 (c) show the operation when a sampling rod or the like is inserted into an excavation hole for geological or ground investigation, or when a steel pipe sheet pile or the like is dropped into the excavation hole. As shown in FIG. 1, the external member 10 is suspended and descends along the excavation line K.

In this case, as shown in FIG.
The cylinder 23 is driven to extend. By this drive, the swing table 22 moves in a direction away from the excavation line K. With the movement of the swing table 22, the guide pin 26 slides in the guide elongated hole 25 in the same direction, and the guide roller 27 rotates and travels on the linear portion 24a of the guide bracket 24. Therefore, the swing table 22 can move stably, and since the guide roller 27 travels while rotating, it can move with a small force.

By continuing the extension drive of the cylinder 23, the guide pin 26 reaches the moving end of the guide elongated hole 25, and at the same time, the guide roller 27 reaches the end of the linear portion 24a.

When the cylinder 23 is further extended and driven, the guide roller 27 travels while rotating the circular arc portion 24b. As a result, the guide pin 26 also rotates at the moving end of the guide elongated hole 25, and the swing table 22 moves to the guide pin 2
Rotate clockwise around 6 By this rotation, the drill head 8 rotates together with the swing table 22 in the same direction, and the state shown in FIG. In this state, as shown by the chain line in FIG. 2, the drill head 8 can be completely retracted from the excavation line K, and there is no hindrance when the outer cutting material 10 moves along the excavation line K. .

In this retracted state, the cylinder 23
Are tilted with respect to the slide table 21 and are maximized. Therefore, the drill head 8 can be stopped at the retracted position unless the cylinder 23 is shortened.

When returning the drill head 8 to the excavation line K,
This is possible by performing the operation opposite to the above. That is, by driving the cylinder 23 to be shortened, the guide roller 27 first travels along the arc portion 24b, and the straight portion 24 is moved.
As it reaches a, the swing table 22 rotates counterclockwise around the guide pin 26. At this time, the guide pin 26 rotates while being placed at the position of the moving end of the guide elongated hole 25.

Further, by driving the cylinder 23 to be shortened, the guide roller 27 travels back along the straight line portion 24a, and the guide pin 26 slides back inside the elongated guide hole 25. Thereby, the drill head 8 returns to the excavation line K, the movement of the swing table 22 is stopped by the engagement of the lock mechanism 28, the drill head 8 stops on the excavation line K, and stable excavation becomes possible.

At this time, if the guide roller 27 is not present, the guide pin 26 starts returning and sliding before the swing table 22 finishes rotating counterclockwise, and the lock step portion 28b of the swing table 22 is locked. Nail 28
It is not possible to ride on a and enter the inside of the lock claw 28a, and it is not possible to achieve good engagement of the lock mechanism 28.

In such an embodiment, the drill head 8
Since the evacuation from the excavation line K is performed by driving the cylinder 8, automatic evacuation is possible, manual work is not required, and the evacuation of the drill head 8 can be easily performed.

At the moving end of the drill head 8, the guide roller 27 travels on the circular arc portion 24b of the guide bracket 24, the swing table 22 rotates about the guide pin 26, and the drill head 8 moves. Since the vehicle is retracted from the position, a long straight stroke until reaching the complete retracted position is unnecessary. Therefore, the structure for retracting can be miniaturized.

Further, since the drill head 8 can be retracted only by driving the single cylinder 23, the drive system such as the hydraulic circuit can be simplified and its control becomes easy.

Furthermore, in this embodiment, since the guide elongated hole 25 is formed in the guide bracket 24, it is not necessary to separately provide these, and it is possible to make it compact and reduce the number of parts. It can be assembled easily.

4 to 6 more specifically describe the present embodiment.

That is, as shown in FIG. 5, the guide brackets 24 are formed in a tubular shape and provided in pairs.
The guide elongated holes 25 are formed so as to penetrate the pair of guide brackets 24. The guide pin 26 slides while being inserted into the guide elongated hole 25 formed in the guide bracket 24, and has a disc-shaped retaining member 31 having a larger diameter than the guide elongated hole 25 at both ends thereof. Are fixed by bolts 32. The retaining member 31 is provided so as to be located outside each of the guide brackets 24, so that the guide pin 26 is guided by the guide elongated hole 25.
It prevents you from getting out. Reference numeral 33 is a hose relay plate attached to the swing table 22, and is used to install a hose (not shown) that supplies oil to hydraulic members such as the cylinder 23.

As described above, since the retaining member 31 is provided, the guide pin 26 does not come off from the elongated guide hole 25, so that stable operation can be performed.

The present invention is not limited to the above embodiment and can be variously modified. For example, the guide slot 2
5 may be formed at a position separate from the guide bracket 24. Further, as the driving means, it is possible to use a member other than the cylinder such as a combination of a hydraulic motor, an electric motor and the like and a rack and pinion.

[0051]

According to the first aspect of the invention, since the drill head is automatically retracted, no manual work is required and the drill head can be easily retracted. Further, since the excavation line is retracted by the rotation, a linear long stroke to reach the retracted position is not required, and the size can be reduced. Further, since the drill head can be retracted only by driving a single driving unit, the driving system can be simplified and its control becomes easy.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the drill head is positioned on the excavation line by the lock mechanism, the drill head is not displaced from the excavation line and the excavation is stabilized. You can do it.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, since the guide elongated hole and the guide bracket are integrated, it is not necessary to provide them separately, and it is compact. In addition, the number of parts can be reduced, and the assembling becomes easy.

[Brief description of drawings]

FIG. 1 is a front view of an excavator to which an embodiment of the present invention is applied.

2 is a side view of the excavator of FIG. 1. FIG.

3A to 3C are plan views showing the structure and operation of an embodiment of a drill head swing device.

4 (a) to (c) are detailed plan views of a drill head swing device corresponding to (a) to (c) of FIG. 3, respectively.

5 is a side view showing the slide table and swing table of FIG. 4. FIG.

FIG. 6 is a plan view showing a slide table and a swing table of FIG.

[Explanation of symbols]

1 excavator 7 Guide cell 8 drill heads 20 Drill head swing device 21 slide table 22 swing table 23 cylinders (driving means) 24 guide bracket 24a Straight part 24b arc part 25 guide long hole 26 Guide pin 27 Guide roller 28 Lock mechanism 29 Guide means K excavation line

Claims (3)

[Claims] 1. A device for retracting a drill head that moves up and down along an upright guide cell from the excavation line, wherein a slide table that moves up and down along the guide cell and the drill head are attached. A swing table supported by the slide table so as to move in a direction away from the excavation line and rotate at a moving end, a driving unit for moving the swing table on the slide table, the slide table and the swing table A guide means provided between the guide table and a guide elongated hole extending along the moving direction of the swing table and a guide pin slidably inserted in the guide elongated hole; and the swing table provided on the slide table. Straight part extending along the moving direction of the table and circular arcs connected to the straight part And a guide roller provided on the swing table so as to travel between the straight line portion and the circular arc portion. When reaching the moving end, the guide roller travels in the arc portion of the guide bracket, whereby the swing table rotates with respect to the slide table around the guide pin and the drill head retracts. Characteristic drill head swing device. 2. The drill head swing device according to claim 1, further comprising a lock mechanism that locks the swing table so that the drill head stops on an excavation line. apparatus. 3. The drill head swing device according to claim 1 or 2, wherein the guide elongated hole is formed in the guide bracket.