JP2005076386A - Rotation assisting device of rotary press-fitting machine for columnar member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation assisting device of a rotary press-fitting machine for a columnar member, which does not mar the stability of the rotary press-fitting machine and can smoothly switch to a rotation transmitting mode depending only on an existing motor when a load imposed on the machine is decreased to such a degree that the existing motor alone can rotate the columnar member, after assitance of rotation by the assisting device. <P>SOLUTION: The rotary press-fitting machine hangs the columnar member by connecting one end of the columnar member to an output shaft of a rotation driving section inclusive of the motor, which is vertically movably supported by a leader mast. Then the rotation assisting device of the rotary press-fitting machine for the columnar member, is supported at a lower portion of the leader mast, and comprised of a rotary body, an auxiliary rotary frame, an auxiliary motor, and a one-way clutch. The rotary body has a chuck device, and the rotary body and the auxiliary rotary frame are concentrically arranged so as to be rotatable individually. The auxiliary motor rotates the auxiliary rotary frame, and connects the auxiliary rotary frame to the rotary body so as to transmit rotation from the former to the latter at the time of one-way continuous rotation of the former. The one-way clutch mechanism cancels the connection when rotation of the rotary body transmitted from the rotation driving section via the chuck device becomes faster than the rotation of the same transmitted from the auxiliary rotary body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention connects a steel pipe casing, a steel pipe pile, a concrete pile, and other various hollow or solid columnar materials to an output shaft of a rotary drive unit including a motor supported to be movable up and down on a mast, and the rotary drive unit The present invention relates to a rotation assisting device for energizing a rotational force when a torque becomes insufficient with only the rotational drive unit in a columnar material rotary press-fitting machine that rotates a columnar material with the rotational force of the shaft and press-fits it into the ground.

  For example, in a steel pipe pile rotary press machine that hangs by connecting the upper end of a steel pipe pile having a drilling blade at the lower end to the output shaft of a rotary drive unit that includes a drive motor supported by a leader mast so as to be movable up and down, The rotational force necessary for the rotation of the pile corresponds to the force excavated by the excavating blade at the lower end of the steel pipe pile and the force rotating against the friction received by the steel pipe pile surface. However, when it becomes impossible to rotate due to gravel or the like during press-fitting, or when it receives static friction at the time of restart after being stopped, a rotational force that overcomes these is required for restart.

  In order to cope with this, conventionally, a proposal has been made to provide a drive motor with a high torque in the rotation drive unit. However, the rotation drive unit is large and heavy, and is not preferable for the stability of the press-fitting machine. In addition, the development of a rotation assist type that supports the existing drive motor has been requested.

  Therefore, an attempt was made to add an auxiliary motor to the rotation drive unit and to urge the auxiliary motor from the auxiliary motor to the existing motor when necessary. However, the existing motor has a higher rotation speed than the normal auxiliary motor, and both rotation speeds are synchronized. Therefore, after the load is reduced to a level where the steel pipe pile can be rotated only with the existing motor, the auxiliary motor cannot be idled. It was.

  The present invention does not impair the stability of the rotary press-fitting machine, and when the load is reduced until the columnar material can be rotated only by the existing motor by the rotation assist, the rotation assist can be switched without any trouble to the rotation only by the existing motor. It is an object to provide an apparatus.

As means for solving the above problems, the present invention provides:
In a columnar material rotary press-fitting machine that hangs by connecting one end of a columnar material to the output shaft of a rotary drive unit that includes a motor supported by the leader mast so as to be movable up and down,
Support the rotation assist device at the bottom of the leader mast so as not to turn,
The rotation assist device is
A rotating body surrounding the columnar material having a chuck device to be detachably gripped on the outer peripheral surface of the columnar material, and an auxiliary rotating frame positioned concentrically on the outer side of the rotating body, respectively.
An auxiliary motor that continuously rotates the auxiliary rotating frame in one direction;
The auxiliary rotating frame and the rotating body are connected to transmit the rotation to the rotating body during one-way continuous rotation of the auxiliary rotating frame, and the rotation is more than the rotation of the rotating body transmitted from the auxiliary rotating frame. A one-way clutch mechanism is provided between the auxiliary rotating frame and the rotating body to release the connection when the rotation of the rotating body transmitted from the driving unit via the chuck device becomes faster;
A rotation assist device in a columnar material rotary press-fitting machine is proposed.

  According to the rotation auxiliary device in the columnar material rotary press-fitting machine of the present invention, the rotation drive unit remains the same, and the rotation auxiliary device is supported at the lower part of the reader mast, so that the stability of the rotary press-fitting machine can be ensured. Yes, when the columnar material becomes unable to rotate due to gravel in the ground, or when it receives static friction at the time of restart after being temporarily stopped, the rotation of the auxiliary motor is added to the rotation of the motor of the rotation drive unit, The columnar material can also be rotated. As a result, the columnar material can be rotated only by the rotation drive unit, or the rotation of the columnar material by the motor of the rotation drive unit (rotation of the rotating body) is rotated by the auxiliary motor. When the speed of the body becomes faster, the clutch mechanism releases the clutch between the rotating body and the auxiliary rotating frame. After that, if the auxiliary motor is stopped, the columnar material is returned to its original rotation by the motor of the rotation drive unit. Smooth return It can be, there is an advantage that the operation can be performed to secure.

  The “columnar material rotary press-fitting device” in which the rotation assisting device according to the present invention is used is one in which only the columnar material is connected to the output shaft of the rotation drive unit, and the columnar material is rotated and press-fitted. A screw rod having a drilling blade at the lower end is connected to the output shaft in a state of being inserted into the hollow of the columnar material, and the columnar material and the screw rod are rotated in opposite directions and screw rods are connected. There is a medium digging type that performs press-fitting while excavating the inside of the columnar material, and other various configurations.

In the former case, an appropriate excavation blade may be provided at the lower end of the columnar material.
For the "one-way clutch mechanism", a claw and a claw wheel, an internal friction clutch, a free rotation clutch, a centrifugal clutch, and other various types are used.

  In FIG. 1, a leader mast (2) is vertically supported on the front end portion of the crawler (1), and a guide rail (3), (3) laid on the front surface of the mast (2) is provided with a motor (5) and a deceleration A rotary drive unit (4) having a machine (6) is supported so as to be slidable up and down via a slide fitting (7), and is suspended up and down by a wire rope (8). A columnar member connection cap (10) is fixed to the output shaft (9) protruding from the lower surface, and the upper end portion of the steel pipe pile (11) having a drilling blade at the lower end can be transmitted to the connection cap (10). The rotation auxiliary device (A) is locked to the lower part of the leader mast (2) of such a steel pipe pile rotary press-fitting machine.

  The structure of the rotation assist device (A) is as follows. 2 and 3, the flat gear box (12) is rotatably supported via the ball bearings (14) and (15) through the short cylindrical rotating body (13) in the center of the flat gear box (12). On the flange (16) protruding on the box (12) of the body (13), a chuck device (17) for gripping the steel pipe pile (11) is mounted, and in this example, the chuck device (17) It consists of three arc-shaped chuck plates (18), (19) and (20). One chuck plate (18) is fixed on the rotating body flange (16) with bolts, and the other chuck plate (19). , (20) are connected to both ends of the fixed chuck plate (18) by pins (21), (21) so as to be swingable on the flange (16) surface, and the swing chuck plate Between each other end of (19), (20) It is connected to the chuck opening and closing hydraulic cylinder (22).

  In the box (12), as shown in FIGS. 3 and 4, on the outside of the rotating body (13), an auxiliary rotating frame (23) made of an annular large gear is mounted on the rotating body (13) by a ball bearing (24). ) In a concentric position, and as a one-way clutch mechanism between the rotating body (13) and the auxiliary rotating frame (23), a claw wheel (25) is provided on the outer peripheral surface of one rotating body (13). And the four auxiliary claws (26) that rotate the claw wheel (25) only in one direction (counterclockwise in FIG. 4) on the other auxiliary rotating frame (23). Are supported by each. Each claw (26) is always bulleted in a direction to be engaged with the claw wheel (25) by an appropriate spring.

  As a driving means for continuously rotating the auxiliary rotating frame (23), two auxiliary motors (28), (28) are installed on one side of the upper surface of the box (12), and both motors (28), (28) The small gears (30) and (30) are fixed to the output shafts (29) and (29) protruding into the box (12), respectively, and these small gears are attached to the teeth of the auxiliary rotating frame (large gear) (23). Engaging.

  The rotation assist device (A) as described above is turned by engaging the slide fittings (31) and (31) projecting from the back of the gear box (12) with the leader mast guide rails (3) and (3). I support it impossible.

  The operation of the above example will be described next. With the chuck device (17) of the rotation auxiliary device (A) opened, the motor (5) of the rotation drive unit (4) is started and the steel pipe pile (11) is rotated to rotate the ground of the steel pipe pile (11). Press-in into the inside. During the press-fitting, when the rotation of the steel pipe pile (11) is stopped by gravel in the ground, the chuck plate (18) is first driven by the reduction driving of the chuck opening / closing hydraulic cylinder (22) in the rotation auxiliary device (A). The steel pipe pile (11) is chucked by shortening (19) and (20).

  Next, the motor (5) of the rotation drive unit (4) is restarted to transmit the rotation to the steel pipe pile (11), and at the same time, the auxiliary motors (28) and (28) are started to start the auxiliary rotating frame (23). 4 is continuously rotated in the counterclockwise direction, and the claw wheel (25) is continuously rotated in the same direction by the claws (26)..., And this rotation passes through the rotating body (13) and the chuck device (17). (11), and the steel pipe pile (11) can overcome the load of gravel and static friction and can rotate.

  The steel pipe pile (11) exceeds the load such as gravel and can be rotated only by the rotational force of the motor (5) of the drive unit. As a result, the rotation of the steel pipe pile (11), that is, the rotation of the rotating body (13) Even if the rotation is faster than the rotation of (23), the claw wheel (25) does not feed the claw (26). Therefore, after confirming the normal rotation of the steel pipe pile (11), the worker stops the auxiliary motors (28) and (28), releases the chuck device (17), and continues the press-fitting of the original steel pipe pile. To do.

It is a side view of a steel pipe pile rotary press machine provided with the rotation auxiliary device of the present invention. It is an enlarged plan view of a rotation auxiliary device. It is the III-III line expanded sectional view of FIG. FIG. 4 is a partially omitted sectional view taken along line IV-IV in FIG. 3.

Explanation of symbols

A Rotation assisting device 2 Leader mast 4 Rotation drive unit 5 Motor 9 Output shaft 11 Steel pipe pile 13 Rotating body 17 Chuck device 23 Auxiliary rotating frame 25 Claw wheel 26 Claw 28 Auxiliary motor

Claims (1)

In a columnar material rotary press-fitting machine that hangs by connecting one end of a columnar material to the output shaft of a rotary drive unit that includes a motor supported by the leader mast so as to be movable up and down,
Support the rotation assist device at the bottom of the leader mast so as not to turn,
The rotation assist device is
A rotating body surrounding the columnar material having a chuck device to be detachably gripped on the outer peripheral surface of the columnar material, and an auxiliary rotating frame positioned concentrically on the outer side of the rotating body, respectively.
An auxiliary motor that continuously rotates the auxiliary rotating frame in one direction;
The auxiliary rotating frame and the rotating body are connected to transmit the rotation to the rotating body during one-way continuous rotation of the auxiliary rotating frame, and the rotation is more than the rotation of the rotating body transmitted from the auxiliary rotating frame. A one-way clutch mechanism is provided between the auxiliary rotating frame and the rotating body to release the connection when the rotation of the rotating body transmitted from the driving unit via the chuck device becomes faster;
Rotation assist device for columnar material rotary press-fitting machine.

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