JPH07189576A - Rod rotation driving device - Google Patents

Abstract

PURPOSE:To eliminate wears of a rod groove part and a rod chucking mechanism by rotating in a single piece the output shaft transmitting a torque to rod and the rod chucking mechanism. CONSTITUTION:When the cylinder 18 of a unchucking mechanism 18 is elongated to sink an unchucking member 21 while a rod rotation driving mechanism 9 is at a standstill, the trunk part 21a is engaged by the internal circumferences of rings 22, 22, and notches 15a, 15a in two chuck plates 15, 15 are disengaged from the groove 6c provided in a joint rod 6a. When the cylinder 18 of the chucking mechanism 13 is shrunk to elevate the unchucking member 21, the two chuck plates 15, 15 move in the shutting direction with the energizing forces of springs 16, 16, and when engagement of the trunk part 21a with the rings 22, 22 goes out, the chuck plates shut entirely to cause the notches to be in detention with the groove in the joint rod 6a. If in this condition, the rod 6 is rotated by the driving mechanism 9, the output shaft 10 and rod chucking mechanism 12 rotate in a single piece to cause the groove and the chuck plates to rotate in a single piece, so that wears of the two members will be eliminated, and the rod 6 is given a push-in propelling force by the contact pressure.

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 in civil engineering / construction machines such as punching machines used for cast-in-place piles, ground improvement machines and excavators.

[0002]

2. Description of the Related Art For example, a rod rotation driving device disclosed in Japanese Utility Model Publication No. 5-26148 has a rod rotation driving device which can be moved up and down along a leader standing on the front part of a base machine. The output shaft of the rod rotation drive mechanism of the device is inserted into and engaged with the angular shaft portion having a polygonal cross section formed on the rod to transmit the rotational force to the rod, and the rod rotation drive device is provided with a non-rotating rod chuck mechanism, A pair of left and right chuck plates of the rod chuck mechanism are closed by springs to be engaged with a groove having a circular cross section formed on the rod to push the rod to give a propulsive force. By the cylinder, both chuck plates are moved in the opening direction to release the engagement between both chuck plates and the groove portion of the rod.

[0003]

The above-mentioned structure has not been a problem when the contact between the non-rotating rod chuck mechanism and the rotating rod is relatively low when the rotating speed of the rod is relatively low. With the aim of improving the efficiency of excavation work, the number of rotations of the rod is increased to increase the number of operations, and along with this, the wear of the rod groove and rod chuck mechanism increases, and both are becoming consumable items. It was

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rod rotation driving device which eliminates wear of the groove portion of the rod and the rod chuck mechanism to improve the durability and also increases the rotational speed of the rod and improves the efficiency of excavation work. I am trying.

[0005]

In order to achieve the above-mentioned object, the present invention has an output shaft which inserts and engages an angular shaft portion having a polygonal cross section formed on a rod, and is erected at the front portion of a base machine. A rod rotation drive mechanism that can be moved up and down along the leader, a pair of left and right chuck plates that are arranged to face each other so as to be movable in the horizontal direction, and that engage with grooves having a circular cross section formed on the rod, and both chuck plates are closed. In a rod rotation drive device including a rod chuck mechanism having a chuck means for bringing the chuck chuck into a state and a chuck release mechanism for moving the two chuck plates in an opening direction, 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 a rod rotation drive device so as to be capable of moving 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]

[Operation] According to the above configuration, when the rod is driven by the rod rotation drive device, the output shaft for transmitting the rotational force to the rod and the rod chuck mechanism rotate integrally, so that the groove portion of the rod and the rod chuck mechanism are integrated. Since it rotates to the end, there is no wear on both. Then, when releasing the engagement between both chuck plates and the groove portion of the rod, the rotation of the rod is stopped, the cylinder is extended and the chuck release member is engaged with the thrust converting mechanism to open both chuck plates, The engagement between the chuck plates and the groove of the rod is released.

[0007]

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

1 to 6 show a first embodiment of the present invention, in which a punching machine 1 is provided with a reader 3 on a front portion of a base machine 2.
And the leader 3 is supported by the back stay 4. A rod rotation drive device 5 is provided above the leader 3 so as to be movable up and down along the leader 3, and a lower guide 7 of a rod 6 that is rotated by the rod rotation drive device 5 is provided below the leader 3. .

The rod rotation drive device 5 is provided with a rod rotation drive mechanism 9 inside the cover 8, and the rod rotation drive mechanism 9 is provided.
Rod insertion hole 10 having a hexagonal cross section inside the output shaft 10
The rod 6 is formed by penetrating a 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 driving the rod rotation drive mechanism 9.

Further, the rod rotation drive device 5 includes an output shaft 1
The connecting cylinder 11 is concentrically fixed to the lower end of 0, and the connecting cylinder 11
A rod chuck mechanism 12 that rotates integrally with the output shaft 10 is provided at the lower end, and a chuck release mechanism 13 is provided 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 through a joint, and the square joint rod 6a has a hexagonal cross section 6b having a hexagonal cross section which is inserted into and engaged with the rod insertion hole 10a of the output shaft 10 on the outer periphery. And a groove 6c having a circular cross section with which the rod chuck mechanism 12 engages is formed in the lower portion of the angular shaft portion 6b, and the lower portion connected to the lower portion of the rectangular joint rod 6a via a relay rod 6d. A 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 arranged so as to be horizontally movable in the support frame 14, and both chucks. It is composed of springs 16 and 16 as chuck means for closing the plates 15 and 15.

The support frame 14 is in the shape of 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. Forming a semicircular notch 15a to be engaged, the guide pins 14b inserted into the support frame 14 are respectively passed through the long holes 15b, 15b formed on both sides,
The support frame 14 is provided so as to be horizontally movable.

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

The chuck release mechanism 13 includes a guide cylinder 17 provided vertically on the cover 8, a cylinder 18 vertically arranged on one side of the guide cylinder 17, and a guide cylinder 1.
7, a spring 19 vertically arranged on the other side and a slide pipe 20 provided on the upper side are inserted into the guide cylinder 17, and a cone-shaped chuck releasing member 21 is supported by the cylinder 18 and the spring 19 so as to be vertically movable. And the chuck plate 1 protruding from both outer ends of the support frame 14, respectively.
It is composed of half-moon-shaped rings 22 and 22 provided on the upper surfaces of the end portions of 5, 15 respectively.

The cone-shaped chuck releasing member 21 is formed in a hollow inverted-conical shape in which the tip side of the lower portion is smaller in diameter than the upper portion, and the connecting cylinder 11 is arranged so as to penetrate the cone-shaped chuck releasing member 21. Half-moon shaped rings 22,22
Is disposed apart from the tip of the cone-shaped chuck releasing member 21 when the cylinder 18 is in a contracted state, and is an interval into which the tip of the cone-shaped chuck releasing member 21 can be inserted between the half-moon shaped rings 22 and 22. It is located in.

The half-moon-shaped rings 22, 22 are attached to stays 15c provided on the upper surface of the end of the chuck plate 15 protruding from the outer end of the support frame 14, respectively, and the cone-shaped chuck releasing member descends as the cylinder 18 extends. The body portion 21a of 21 engages with the inner circumferential sides of the two half-moon shaped rings 22 and 22 to widen the space between the two half-moon shaped rings 22 and 22, and the vertical force due to extension of the cylinder 18 is applied in the horizontal direction. The chuck plate 15 is moved in the opening direction by acting as a thrust converting mechanism for converting the chuck plate 15 into the opening direction.

For this reason, the inner peripheral side of the half-moon shaped rings 22, 22 has the body portion 21 of the cone-shaped chuck releasing member 21.
In order to make contact with a, conical inclination processing is performed in the plate thickness surface direction.

With this construction, the rod chuck mechanism 12 extends the cylinder 18 of the chuck release mechanism 13 and lowers the cone-shaped chuck release member 21 while the rod rotation drive mechanism 9 is stopped. The body portion 21a of the chuck release member 21 engages with the inner peripheral sides of the half-moon shaped rings 22 and 22, and the chuck plates 15 and 15 move in the opening direction as the cone chuck release member 21 descends. , Notches 15a of both chuck plates 15 and 15,
The engagement between 15a and the groove portion 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, both chuck plates 15 and 15 are springs 16 and 1.
6 is moved in the closing direction by the urging force of 6, and the body portion 21a of the cone-shaped chuck releasing member 21 and both half-moon shaped rings 22,
When the engagement with 22 is eliminated, both chuck plates 15 and 15 are completely closed and the notches 15a and 15a are formed in the square joint rod 6.
It engages with the groove 6c of a.

When the rotary drive mechanism 9 is operated to rotate the rod 6 in this state, the output shaft 10 transmitting the rotational force to the rod 6 and the rod chuck mechanism 12 rotate integrally, so that the groove portion of the square joint rod 6a is rotated. 6c and both chuck plates 1
Since 5 and 15 rotate together, there is no wear of both,
Both chuck plates 15 due to the lowering of the rod rotation drive device 5,
A simple surface pressure between 15 and the groove portion 6c of the square joint rod 6a applies a thrusting force to the rod 6 by pushing it.

Therefore, the durability of the square joint rod 6a and both chuck plates 15, 15 can be improved, and the rod 6
Since the rod chuck mechanism 12 and the rod chuck mechanism 12 rotate integrally with each other, the rotational resistance can be significantly reduced as compared with the conventional one, so that a large rotational driving force and high-speed rotation are possible, and the efficiency of excavation work can be improved. Furthermore, both chuck plates 15, 15
The pushing force is transmitted by a simple surface pressure between the groove portion 6c of the rectangular joint rod 6a and the rectangular joint rod 6a. Therefore, if the width and depth of the groove portion 6c and the plate thickness of both chuck plates 15 and 15 are strengthened, a strong rod is obtained. It can transmit thrust force and can be applied not only to drilling machines but also to large diameter excavators.

7 to 9 show a second embodiment of the present invention. The same elements as those of the first embodiment will be described with the same reference numerals.

In the present embodiment, as the chuck release mechanism 30, a ring-shaped chuck release member 31 is movably supported by a cylinder 18 provided on the cover 8 of the rod rotation drive device 5 and provided on a side portion of the connecting cylinder 11. Arm 32,3
2, the intermediate portions of the levers 33, 33 are rotatably supported, and the lower ends of the levers 33, 33 are connected to the ends of the chuck plates 15, 15 projecting from both outer ends of the support frame 14, respectively. When the ring-shaped chuck releasing member 31 is extended by extending the ring-shaped chuck releasing member 31 downward,
By pushing downward through spherical seats 33a, 33a provided at the upper ends of 3, 33, levers 33, 33 rotate to form a thrust converting mechanism, and a structure for moving chuck plates 15, 15 in the opening direction is provided. The same effect as that of the first embodiment is obtained.

The thrust converting mechanism is not limited to those described in the above embodiments, but other means such as a cam or a link may be used, which are included in the technical idea of the present invention. It is a thing. Further, the rod chuck mechanism and the chuck release mechanism may be provided above the rod rotation drive device, and the excavating direction of the working machine is not limited to the downward direction.

[0026]

As described above, in the rod rotation drive device of the present invention, the output shaft of the rod rotation drive mechanism that is vertically movable along the leader is engaged with the groove portion having a circular cross section formed on the rod. A rod chuck mechanism having a pair of left and right chuck plates and chuck means for closing both chuck plates is provided so as to be integrally rotatable, and supported by a cylinder arranged in a non-rotating portion of the rod rotation drive device so as to be able to move up and down. The chuck release mechanism is composed of a chuck release member that is moved by the extension of the cylinder and a thrust conversion mechanism that moves both chuck plates in the opening direction by engaging with the chuck release member that advances by the extension of the cylinder. The pair of left and right chuck plates are opened and the rod groove is opened by the chuck release member that advances due to the extension of the cylinder provided in the rotating part, engaging the thrust converting mechanism. 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 that transmits the rotational force to the rod and the rod chuck mechanism rotate integrally, so that the groove portion of the rod and the rod chuck mechanism rotate integrally, so that wear of both is prevented. Disappear.

Therefore, the durability of the rod and both chuck plates can be improved, and since the rod and the rod chuck mechanism rotate integrally, the rotational resistance can be greatly reduced as compared with the conventional one, so that a large rotational driving force and high speed can be achieved. Rotation is possible and the efficiency of excavation work can be improved. Furthermore, since the pushing thrust force is transmitted by simple surface pressure between both chuck plates and the groove portion of the rod, if the width and depth of the groove portion and the thickness of both chuck plates are strengthened, a strong rod pushing force It can be applied to not only drilling machines but also large diameter excavators.

[Brief description of drawings]

FIG. 1 is a sectional view of a rod rotation drive device showing a first embodiment of the present invention.

FIG. 2 is a side view of a punch.

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 in FIG.

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 showing 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 ... Punching machine, 2 ... Base machine, 3 ... Reader, 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)

[Claims] 1. A rod rotation drive mechanism having an output shaft for inserting and engaging an angular shaft portion having a polygonal cross-section formed on a rod, and being capable of moving up and down along a leader installed upright in the front part of a base machine. A rod chuck mechanism having a pair of left and right chuck plates that are movably opposed to each other in the horizontal direction and that engage with groove portions having a circular cross section formed in the rod, and a chuck means that closes both chuck plates, In a rod rotation drive device including a chuck release mechanism that moves a chuck plate in an opening direction, the rod chuck mechanism is integrally rotatably provided on the output shaft, and the chuck release mechanism is a non-rotating portion of the rod rotation drive device. A chuck release member that is supported by a cylinder that is lifted up and down and a chuck release member that advances when the cylinder extends to open both chuck plates. A rod rotation drive device characterized by comprising a thrust converting mechanism for moving in the forward direction.