JPH0715872Y2 - Casing chuck device in rotary tubing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a casing chuck device in a rotary tubing device that pushes or pulls out by rotating a casing tube such as a steel pipe pile in foundation work such as construction and civil engineering.

(Prior Art) Conventionally, an elevating frame, which is supported by a plurality of push-in / pull-out cylinders so as to be vertically movable on the ground, supports an annular rotating body surrounding a casing tube and a hydraulic motor for rotating the rotating body. In the rotary tubing device including a chuck device for contacting and separating the rotating body and the casing tube, the chuck device includes a support frame connected to an upper part of the elevating frame via a chuck cylinder, and the support frame being connected to the support frame. , While rotatably supporting an annular rotating frame facing the rotating body,
A wedge-shaped chuck member to be engaged and disengaged is attached to the rotating frame between the rotating body and the casing tube, and the chuck member is engaged and disengaged by raising and lowering the supporting frame and the rotating frame by driving the chuck cylinder to rotate the rotating body. There is known a structure for transmitting or shutting off the electric field from the casing tube.

(Problems to be solved by the invention) However, in this conventional chuck device, the wedge-shaped chuck member is sufficiently wedged between the rotor and the casing tube in order to transmit or block rotation to the casing tube. In order to disengage, it is necessary to apply a strong pushing force or pulling force to the chuck member to overcome the large frictional resistance between the rotating body and the casing tube and achieve wedge insertion and disengagement. Not only a large-sized one must be provided, but also the chuck member, the rotating body, and the like are severely worn and damaged.

The purpose of this plan is to eliminate the conventional drawbacks.

(Means for Solving the Problem) In order to solve the above-mentioned problem, the present invention has a horizontally supported lifting frame that rotatably supports a ring-shaped rotating body that surrounds a casing tube and is rotationally driven by a motor. A rotary tubing device including a chuck device for contacting and separating the rotating body and the casing tube, wherein the chuck device connects a supporting frame to the elevating frame by a chuck cylinder so that the supporting frame can be moved up and down, and the rotating frame is connected to the rotating frame. A rotating frame positioned outside the body is rotatably supported, and the rotating body is supported so as to move forward and backward in a radial direction so as to abut the casing tube inside the rotating body. The frame and each chuck member are moved together with the rotating frame to move the chuck members forward and backward. Was ligated Rurinku proposes a casing chucking device in a rotary tubing and wherein the.

The term “annular” of the rotating body in the present invention is used as a term including a cylindrical shape, a ring shape and the like. An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment) In FIG. 1, a rotary tubing device (2) is installed in front of a lower end portion of a leader mast (1) in an excavator (A), and the tubing device holds a casing tube (3). .

The structure of the rotary tubing device (2) is as follows. In FIGS. 2, 3 and 4, two diametrically opposite sides of a hollow ring-shaped lifting frame (5) are arranged in the middle of two thrust cylinders (4) and (4) installed vertically on the ground. The slide masts (6) and (6) that are fixed and project on the other side of the elevating frame (5) are attached to the leader mast (1).
These two guide rails (7) and (7) are slidably engaged and supported (Fig. 3), and the upper end of the annular rotating body (8) is inserted into the annular opening of the elevating frame (5). Bearing (9)
It is rotatably supported concentrically via. The rotating body (8) is a substantially short cylindrical body with openings at both ends, and the inside of the open cylinder serves as a casing insertion hole (10), and the lower half of the rotating body (8) serves as a cylindrical rotating body body (11) to move up and down. It projects downward from the frame (5).

Inside the hollow of the lifting frame (5), an annular large gear (12) concentrically fixed to the outer peripheral surface of the upper end of the rotating body (8) is positioned, and on the other hand, to the outer circumference of the lifting frame (5). The hydraulic motors (13) and (13) are installed on the overhanging part of the pinion, and the pinions (15) and (1) are respectively attached to the output shafts (14) and (14) protruding from the both motors into the hollow of the lifting frame (5).
5) is fixed and these pinions (15) and (15) are meshed with the gear wheel (12), whereby the motor (13),
(13) rotation is pinion (15), (15), gear (12)
It is transmitted to the rotating body (8) via.

The structure of the chuck device for contacting and separating the rotation of the rotating body (8) to the casing tube (3) in order to transmit and block the rotation is as follows. Cylindrical body (11) of the rotating body (8)
In the present example, five short cylindrical guides (16), etc., are fixed to each other in the radial direction by penetrating the main body (11) at equidistant positions with respect to each other. A chuck member (17) in the form of a short cylinder is fitted in the radial direction so as to be movable back and forth. The chuck member (17) has a front surface formed into a concave curved surface corresponding to the outer peripheral surface of the casing tube (3) and a rough surface having fine irregularities, and a bracket (18) is provided on the rear surface so as to project. is there. On the other hand, on the outer peripheral surface of the elevating frame (5), five brackets (19) are projectingly provided at positions corresponding to the chuck members (17), and each bracket has one end of each chuck cylinder (20). The outer peripheral surface of the short cylindrical support frame (22), which has a larger diameter than both ends of the ram (21) ... of each cylinder (20) ... The bracket (23)
Are connected to each other, and a ring-shaped rotary frame (24) having a diameter slightly larger than the rotary body (11) is rotatably supported inside the support frame (22) through a bearing (25). At this time, the rotary frame (24) is held by the rotary body (11), particularly its guide cylinders (16), when the support frame (22) is moved up and down by driving the chuck cylinders (20). Chuck members (17)
There is a positional relationship of moving up and down on the outside of the ..., And a toggle pressing mechanism is provided between the rotating frame (24) and the chuck member (17).

As the toggle pressing mechanism, in the present example, brackets (26) are projectingly provided at positions corresponding to the chuck members (17) of the rotary frame (24), and these brackets (26) ...
The chuck member (17) ... the bracket (18) on the rear surface are pin-connected to both ends of the arc-shaped toggle link (27). In this case, when the support frame (22) and the rotating frame (24) are at the lowest position due to the extension of the chuck cylinders (20), the toggle links (27) are inclined as shown in FIG. Therewith, the chuck members (17) are retracted to separate the tip end surface thereof from the casing tube (3), but the chuck cylinders (20) are reduced in size to support frames (22),
When the rotary frame (24) rises to the uppermost position, the rotary frame (24) is brought into a substantially horizontal state, whereby the chuck members (17) are advanced so that the tip end surface is pressed against the outer peripheral surface of the casing tube (3).

The support frame (22) has a groove-shaped slide plate (2) fixed vertically to the outer peripheral surface thereof as shown in the second and third drawings.
8), (28) to the above thrust cylinders (4), (4)
By engaging rails (29) and (29) laid vertically on the outer surface of the, the stability during lifting is maintained.

Next, the operation of the rotary tubing device (2) of the above example will be described. First, when the casing tube (3) is pushed into the ground, first, the elevating frame (5) and the supporting frame (22) are lifted by the extension drive of the thrust cylinders (4) and (4), and then the chuck cylinder ( When the support frame (22) and the rotary frame (24) are raised by the reduction drive of 20), the toggle members (27) move from the inclined posture to the horizontal posture and the chuck members (17) move forward and Chuck the casing tube (3) on the front side. When the rotary body (8) is rotated by starting the hydraulic motors (13) and (13) in this state, the casing tube (3) also rotates together with the chuck members (17). Along with that, when the lifting frame (5) and the support frame (22) are gradually lowered by the reduction drive of the thrust cylinders (4), (4), the casing tube (3) moves to the thrust cylinders (4), (4). One stroke is pushed into the ground.
Next, when the support frame (22) and the rotating frame (24) are lowered by the extension drive of the chuck cylinders (20), the toggle links (27) move from the horizontal posture to the inclined posture and the chuck members (17). ... is retracted, the chuck of the casing tube (3) is released, and in that state, the elevating frame (5) and the supporting frame (22) are raised by the extension drive of the thrust cylinders (4) and (4), and the same as above. Restart the casing tube (3) rotation push,
This is repeated below. In chucking and releasing the chuck members (17), the frictional resistance from the rotating body and the casing tube as in the conventional case is not added to the operation of the chuck members (17), and the toggle is used in chucking. When the link (27) shifts from the inclined posture to the horizontal posture, the chuck member (17) is brought into pressure contact with the casing tube with the maximum pressing force by its boosting action, and reliable chucking is performed.

When the casing tube (3) is pulled out, the elevating frame (5) and the support frame (22) are lifted by extending the thrust cylinders (4) and (4) while chucking and rotating the casing tube (3).

(Effect of the Invention) According to the casing chuck device in the rotary tubing device of the present invention, frictional resistance from the rotating body and the casing tube unlike the conventional device is completely eliminated when the chuck member is brought into contact with and separated from the casing tube. Therefore, the chuck cylinder can be smaller than the conventional one, and the damage to the chuck member, rotating body, etc. can be reduced, and moreover, when chucking the chuck member with respect to the casing tube, the force of the toggle link is increased. Due to the action, it works with a large pressing force, and reliable chucking can be achieved.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a side view of an excavator equipped with a tubing device, FIG. 2 is an enlarged front view of the tubing device portion without a chuck cylinder, and FIG. 3 is a tubing device portion. FIG. 4 is a partially cutaway plan view of FIG. 4, and FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 2 ... Rotating tubing device, 3 ... Casing tube, 5 ... Lifting frame, 8 ... Rotating body, 13 ... Hydraulic motor, 17 ... Chuck member, 20 ... Chuck cylinder, 22 ... Support frame, 24 …… Rotating frame, 27 ……
Toggle link.

Claims (1)

[Scope of utility model registration request] 1. A chuck device for rotatably supporting a rotating body, which is an annular shape surrounding a casing tube and is rotationally driven by a motor, on a horizontally supported lifting frame, and which brings the rotating body and the casing tube into contact with each other. In the rotary tubing apparatus provided with the chuck device, the supporting frame is movably connected to the elevating frame by a chuck cylinder, and the supporting frame rotatably supports the rotating frame positioned outside the rotating body. A plurality of chuck members are supported on the rotating body so as to be movable back and forth in a radial direction so as to be brought into contact with and separated from a casing tube inside the rotating body, and the rotating frame and each chuck member are respectively moved by raising and lowering the rotating frame. In a rotary tubing device, which is connected by a dogle link to move the chuck member back and forth. A casing chuck device.