JP2741006B2 - Rod rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod rotation drive device used for a civil engineering / construction machine such as a drilling machine, a ground improvement machine and an excavator used for cast-in-place piles.

[0002]

2. Description of the Related Art For example, in a rod rotation driving device disclosed in Japanese Utility Model Publication No. 5-26148, a rod rotation driving device is provided so as to be able to move up and down along a leader erected at a front portion of a base machine, and the rod rotation driving device is provided. Inserting and engaging a polygonal cross-section square shaft formed on the rod to the output shaft of the rod rotation drive mechanism of the device to transmit the rotational force to the rod, and providing the rod rotation drive with a non-rotating rod chuck mechanism, A pair of left and right chuck plates of the rod chuck mechanism are closed by a spring and engaged with a groove having a circular cross section formed in the rod to push the rod to apply a propulsive force. The chuck plates move both chuck plates in the opening direction to release the engagement between the chuck plates and the groove of the rod.

[0003]

In the above-mentioned structure, the contact between the non-rotating rod chuck mechanism and the rotating rod is not a problem when the rotation speed of the rod is relatively low. In order to improve the efficiency of excavation work, work is often performed with a high rotation speed of the rod, and as a result, the wear of the rod groove and the rod chuck mechanism increases, and both parts become consumables. Was.

Accordingly, an object of the present invention is to provide a rod rotation drive device which eliminates abrasion of a rod groove and a rod chuck mechanism, improves durability, and improves the efficiency of excavation work by increasing the number of rotations of a rod. And

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention has an output shaft which is inserted into and engaged with a polygonal cross-section square shaft formed on a rod, and is provided upright at a front portion of a base machine. A pair of right and left chuck plates, which are disposed so as to be able to move up and down along the leader, and which are disposed to face each other movably in the horizontal direction and engage with a groove having a circular cross section formed in the rod, and close both chuck plates. A rod chuck mechanism having a chuck means for setting a state and a chuck release mechanism for moving both chuck plates in an opening direction, wherein the rod chuck mechanism is integrally rotatable with the output shaft. A chuck release member supported by a cylinder disposed in a non-rotating portion of the rod rotation drive device so as to be able to move up and down, and an extension of the cylinder. Is characterized by being configured by the thrust conversion mechanism for moving in the direction to open the engage the advancing chuck releasing member chucks plate.

[0006]

According to the above configuration, when the rod is rotated by the rod rotation driving device, the output shaft transmitting the rotational force to the rod and the rod chuck mechanism rotate integrally, so that the rod groove and the rod chuck mechanism are integrated. So that wear of both is eliminated. Then, when releasing the engagement between both chuck plates and the groove of the rod, the rotation of the rod is stopped, the cylinder is extended, the chuck release member is engaged with the thrust conversion mechanism, and both chuck plates are opened, The engagement between both chuck plates and the groove of the rod is released.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a drilling machine will be described below with reference to the drawings.

FIGS. 1 to 6 show a first embodiment of the present invention. A drilling machine 1 includes a reader 3 at a front portion of a base machine 2.
And the reader 3 is supported by the back stay 4. A rod rotation driving device 5 is provided above the reader 3 so as to be able to move up and down along the reader 3, and a lower guide 7 of a rod 6 rotated by the rod rotation driving device 5 is provided below the reader 3. .

The rod rotation driving device 5 includes a rod rotation driving mechanism 9 inside the cover 8.
Hexagonal rod insertion hole 10 inside output shaft 10
a is formed in the vertical direction, the rod 6 is inserted into and engaged with the rod insertion hole 10a, and the rod 6 is rotated by the driving of the rod rotation drive mechanism 9.

Further, the rod rotation driving device 5 includes an output shaft 1
0, a connecting cylinder 11 is fixed concentrically to the lower end of the connecting cylinder 11.
At the lower end, a rod chuck mechanism 12 that rotates integrally with the output shaft 10 is provided, and a chuck release mechanism 13 is disposed between the lower surface of the cover 8 and the rod chuck mechanism 12.

The rod 6 is formed by connecting a plurality of rods via a joint. The square joint rod 6a has a hexagonal cross section 6b having a hexagonal cross section which is inserted into the outer periphery of the rod and inserted into the rod insertion hole 10a of the output shaft 10. In the lower part of the square shaft part 6b, a groove part 6c having a circular cross section with which the rod chuck mechanism 12 is engaged is formed, and the lower part connected to the lower part of the square joint rod 6a via a relay rod 6d is formed. The stirring head 6f is attached to the lower end of the rod 6e.

The rod chuck mechanism 12 includes a support frame 14 provided at the lower end of the connecting cylinder 11, a pair of left and right chuck plates 15 and 15 which are disposed so as to be movable in the horizontal direction in the support frame 14, and a pair of chucks. Springs 15, 16 serving as chuck means for closing the plates 15, 15 are provided.

The support frame 14 is a flat square pipe having a circular hole 14a formed in the center thereof for inserting the square joint rod 6a. Each chuck plate 15 has an inner end formed in a groove 6c of the square joint rod 6a. A semicircular notch 15a to be engaged is formed, and guide pins 14b inserted into the support frame 14 are respectively passed through elongated holes 15b, 15b formed on both sides,
The support frame 14 is provided so as to be movable in the horizontal direction.

The springs 16, 16 are extended on both ends of the chuck plates 15, 15 projecting from both outer ends of the support frame 14, respectively, and urge the chuck plates 15, 15 in the closing direction. .

The chuck releasing mechanism 13 includes a guide cylinder 17 provided on the cover 8 in a vertical direction, a cylinder 18 provided on one side of the guide cylinder 17 in a vertical direction, and a guide cylinder 1.
A cone-shaped chuck release member 21 is inserted through a guide pipe 17 through a spring 19 disposed on the other side in the vertical direction and a slide pipe 20 provided on the upper side, and supported by the cylinder 18 and the spring 19 so as to be able to move up and down. And chuck plates 1 projecting from both outer ends of the support frame 14, respectively.
5 and 15 are provided on the upper surfaces of the end portions.

The cone-shaped chuck releasing member 21 is formed in a hollow inverted conical shape in which the lower end side is smaller in diameter than the upper portion, and the connecting tube 11 is disposed through the cone-shaped chuck releasing member 21. Half-moon shaped rings 22, 22
Is a distance in which the distal end of the cone-shaped chuck releasing member 21 can be inserted between the two half-moon-shaped rings 22, 22 when the cylinder 18 is in the contracted state. Are located in

The semi-circular rings 22, 22 are attached to stays 15c provided on the upper surface of the end of a chuck plate 15 protruding from the outer end of the support frame 14, respectively. 21 is engaged with the inner peripheral sides of the two half-moon-shaped rings 22, 22, so that the interval between the two half-moon-shaped rings 22, 22 is increased, and the vertical force due to the extension of the cylinder 18 is applied in the horizontal direction. , And moves the chuck plate 15 in the opening direction.

For this reason, the inner peripheral sides of the semicircular rings 22 and 22 are connected to the body 21 of the cone-shaped chuck releasing member 21.
In order to make contact with a, a conical inclined processing is performed in the thickness direction of the plate.

With such a configuration, the rod chuck mechanism 12 extends the cylinder 18 of the chuck releasing mechanism 13 and lowers the cone-shaped chuck releasing member 21 while the rod rotation driving mechanism 9 is stopped. The body 21a of the chuck release member 21 is engaged with the inner peripheral sides of the two semicircular rings 22, 22, and the chuck plates 15, 15 are moved in the opening direction as the cone release member 21 descends. , Notches 15a of both chuck plates 15, 15,
The engagement between the groove 15c and the groove 6c of the square joint rod 6a is released.

When the cylinder 18 of the chuck releasing mechanism 13 is contracted and the cone-shaped chuck releasing member 21 is raised, the two chuck plates 15 and 15 are moved by the springs 16 and 1.
6, the body 21a of the cone-shaped chuck releasing member 21 and the two semicircular rings 22,
When the engagement with the rod 22 is lost, the chuck plates 15, 15 are completely closed and the notches 15a, 15a
a to engage with the groove 6c.

When the rod 6 is rotated by operating the rotation drive mechanism 9 in this state, the output shaft 10 for transmitting the rotational force to the rod 6 and the rod chuck mechanism 12 rotate integrally, so that the groove of the square joint rod 6a is formed. 6c and both chuck plates 1
5,15 rotate as one, so wear of both is eliminated,
The two chuck plates 15 due to the lowering of the rod rotation driving device 5,
The rod 6 is pushed by a simple surface pressure between the rod 15 and the groove 6c of the square joint rod 6a to give a propulsive force.

Therefore, the durability of the square joint rod 6a and the chuck plates 15, 15 can be improved.
Since the rod chuck mechanism 12 and the rod chuck mechanism 12 rotate integrally, the rotation resistance can be significantly reduced as compared with the conventional art, so that a large rotation driving force and high-speed rotation can be achieved, and the efficiency of excavation work can be improved. Further, both chuck plates 15, 15
When the width and depth of the groove 6c and the plate thickness of both chuck plates 15, 15 are strengthened, a strong rod can be obtained. It can transmit the pushing propulsion force and can be applied not only to a drilling machine but also to a large-diameter excavator and the like.

FIGS. 7 to 9 show a second embodiment of the present invention. The same elements as those in the first embodiment are designated by the same reference numerals.

In this embodiment, as a chuck releasing mechanism 30, a ring-shaped chuck releasing member 31 is supported on a cylinder 18 provided on the cover 8 of the rod rotation driving device 5 so as to be able to move up and down, and is provided on a side portion of the connecting cylinder 11. Arm 32,3
2, a lower end of each of the levers 33, 33 is rotatably supported on an intermediate portion thereof, and lower ends of the levers 33, 33 are connected to ends of chuck plates 15, 15 projecting from both outer ends of the support frame 14, respectively. When the ring-shaped chuck releasing member 31 is lowered by extending the ring-shaped chuck releasing member 31, the lever 3 is released.
By pushing downward through spherical seats 33a provided at the upper ends of the plates 33, 33, the levers 33, 33 are turned to become a thrust converting mechanism, and the chuck plates 15, 15 are moved in the opening direction. Thus, the same effects as in the first embodiment can be obtained.

The thrust converting mechanism is not limited to the one described in each of the above embodiments, but may be other means such as a cam and a link, which are included in the technical concept of the present invention. Things. Further, the rod chuck mechanism and the chuck release mechanism may be provided above the rod rotation drive device, and the excavation direction of the working machine is not limited to the downward direction.

[0026]

As described above, the rod rotation driving device according to the present invention engages with the output shaft of the rod rotation driving mechanism which can be moved up and down along the reader, and engages with the groove having a circular cross section formed on the rod. A rod chuck mechanism having a pair of left and right chuck plates and a chuck means for closing both chuck plates is provided so as to be integrally rotatable, and is supported so as to be able to move up and down by a cylinder arranged in a non-rotating portion of the rod rotation driving device. The chuck release mechanism is constituted by a chuck release member to be moved and a thrust conversion mechanism that moves the chuck plates in the opening direction by engaging with the chuck release member that advances by extension of the cylinder. A pair of left and right chuck plates are opened by engaging a chuck releasing member that advances by extension of a cylinder provided on the rotating portion with the thrust conversion mechanism, thereby forming a groove in the rod. To release the engagement with, if the chuck releasing member is retracted by the contraction of the cylinder, the chucks plate is engaged with the groove of the rod are closed by the chuck means. Then, when the rod is rotated by the rod rotation drive device, the output shaft transmitting the rotational force to the rod and the rod chuck mechanism rotate integrally, so that the rod groove and the rod chuck mechanism rotate integrally, so that the two parts are worn. Disappears.

Therefore, the durability of the rod and the two chuck plates can be improved, and the rod and the rod chuck mechanism rotate integrally, so that the rotational resistance can be greatly reduced as compared with the prior art. Rotation is possible, and the efficiency of excavation work can be improved. Furthermore, since the pushing propulsion force is transmitted by the simple surface pressure between both chuck plates and the groove of the rod, if the width and depth of the groove and the plate thickness of both chuck plates are strengthened, the strong rod pushing propulsion force And can be applied not only to a drilling machine but also to a large-diameter excavator and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rod rotation driving device according to a first embodiment of the present invention.

FIG. 2 is a side view of the drilling machine.

FIG. 3 is a side view of the rod rotation driving device in a rod chuck state.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a side view of the rod rotation driving device in a rod chuck released state.

FIG. 6 is a plan view of the rod chuck mechanism in a rod chuck released state.

FIG. 7 is a side view of a rod rotation driving device according to a second embodiment.

FIG. 8 is a plan view of the rod chuck mechanism in a rod chuck state.

FIG. 9 is a plan view of the rod chuck mechanism in a rod chuck released state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drilling machine, 2 ... Base machine, 3 ... Leader, 5 ... Rod rotation drive device, 6 ... Rod, 8 ... Cover, 9 ... Rod rotation drive mechanism, 10 ... Output shaft, 11 ... Connection cylinder, 12 ... Rod chuck Mechanism, 13, 30 ... chuck release mechanism, 1
5: chuck plate, 16: spring, 18: cylinder,
21: cone-shaped chuck releasing member, 22: half-moon shaped ring, 31: ring-shaped chuck releasing member, 32: arm,
33 ... Lever

Claims (1)

(57) [Claims] 1. A rod rotation drive mechanism having an output shaft inserted through and engaged with a polygonal cross-section square shaft formed on a rod, and provided to be able to move up and down along a leader erected at the front of a base machine. A rod chuck mechanism having a pair of left and right chuck plates, which are disposed to face each other movably in the horizontal direction and engage with grooves having a circular cross section formed in the rod, and chuck means for closing both chuck plates; A rod rotation driving device having a chuck release mechanism for moving a chuck plate in an opening direction, wherein the rod chuck mechanism is provided so as to be integrally rotatable on the output shaft, and the chuck release mechanism is provided on a non-rotating part of the rod rotation driving device. The two chuck plates are opened by engaging with a chuck releasing member supported by a cylinder disposed in a vertically movable manner and a chuck releasing member advanced by extension of the cylinder. And a thrust conversion mechanism for moving the rod in the direction of movement.