JP4122497B2 - Rotation assist device for columnar material rotary press-fitting machine - Google Patents

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 part including a motor supported by a mast so as to be movable up and down. 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 down 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 including a drive motor that is 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 the press-fitting, or when it receives static friction at the time of starting after being stopped, a rotational force that overcomes these is required for restarting.

  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 on the leader mast so that it can be raised and lowered and cannot be turned,
The rotation assist device is
Each of the rotating body surrounding the columnar member and an annular rocking body located concentrically outside the rotating body has a rotatable structure.
Oscillating drive means for oscillating the oscillating body;
A one-way clutch mechanism is provided that connects the rocking body and the rotating body to transmit the rocking to the rotating body when the rocking body swings in one direction, and releases the connection when rocking in the other direction.
Equipped with elevating means for elevating and lowering the rotation auxiliary device along the leader mast, and connecting means for detachably connecting the rotating body with the output shaft of the rotation drive unit when ascending.
A rotation assist device for a columnar material rotary press-fitting machine is proposed.

  According to the rotation assisting device in the columnar material rotary press-fitting machine of the present invention, the rotation assisting device may be lowered to the lower part of the leader mast when not in use, and is raised at the time of use and connected to the output shaft of the rotation drive unit. Sometimes the columnar material has already been pressed into a considerable length of land, so that the rotary press can be kept stable, and when the columnar material becomes unable to rotate due to gravel, etc. When receiving static friction during start-up, the columnar material can be re-rotated by connecting the rotation assist device to the output shaft of the rotation drive unit and urging the rotation of the rocking body to the rotation drive unit. When the load is reduced until the columnar material can be rotated by only the motor of the part, the clutch mechanism is released and idling, thereby preventing the occurrence of the braking action that is seen in the conventional tentative plan. Normal columnar material Stop oscillator after confirming rolling may be performed to leave the rotating auxiliary device and the output shaft is easily operated in Kagae.

  The “columnar material rotary press-fitting machine” 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 hollow columnar material, the hollow columnar material and the screw rod are rotated, and the hollow rod shape is rotated by the screw rod. There are a medium digging type in which the inside of the material is press-fitted while digging, and various other configurations.

  In the former case, an appropriate excavating blade is preferably provided at the lower end of the columnar material.

  In addition, a fluid pressure cylinder such as a hydraulic cylinder, a motor and a link mechanism, and other various means are used for the “swing drive means”.

  Further, the “one-way clutch mechanism” includes a claw and a claw wheel, an internal friction clutch, a free rotation clutch, a centrifugal clutch, and other various types.

  In addition, as the “lifting means” of the rotation assisting device, a wire rope connected to the rotation assisting device is wound and unwound by a winch, and other various devices are used.

  Further, the "connecting means" between the rotating body and the output shaft of the rotation drive unit includes the rotating body, a columnar member connection cap fixed to the output shaft, or a connection output shaft, and a pin and pin hole engagement. , Spline engagement, and other various means 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) and (3) laid on the front surface of the mast (2) are provided with a motor (5) and a speed reducer. 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). The columnar member connection cap (10) is fixed to the output shaft (9) protruding from the lower surface, and the upper end of the steel pipe pile (11) having a drilling blade at the lower end is transmitted to the connection cap (10) in this example. The rotation auxiliary device (A) is supported on the leader mast (2) of such a steel pipe pile rotary press machine so as to be movable up and down and non-turnable.

  The structure of the rotation assist device (A) is as follows. 2, 3, and 5, in the center of the flat gear box (12), a short cylindrical rotating body (13) is passed through the ball bearings (14) and (15) in a rotatable state, Inside the box (12), on the outside of the rotating body (13), an annular rocking body (23) is rotatably supported by a ball bearing (24) at a position concentric with the rotating body (13). As a one-way clutch mechanism between the oscillating body (23) and the rotating body (13), in this example, the ratchet wheel (25) is fixed to the outer peripheral surface of one rotating body (13), and the other oscillating body (23 ), The four claws (26)... For rotating the claw wheel (25) only in one direction (counterclockwise in FIG. 3) are supported by shafts (27). Each claw (26) is always bulleted in a direction to engage with the claw wheel (25) by an appropriate spring (not shown).

  As drive means for swinging the swing body (23), the two swing hydraulic cylinders (28) and (28) are parallel to each other and tangential to the swing body (23). The bases of both cylinders (28) and (28) are rotatably connected to the inner corner of the box (12) by shafts (29) and (29), and the tip ends of the piston rods (30) and (30) Is connected to the rocking body (23) by shafts (31) and (31).

  The above-mentioned rotation assisting device (A) is mounted on the guide rails (3), (3) of the leader mast (2) with the slide fittings (32), (32) projecting from the back of the gear box (12). It is engaged so as to be slidable up and down and non-turnable.

  A device for connecting the rotating body (13) of the rotation assisting device to the output shaft (9) of the rotation driving unit (4) is as follows. A flange (33) is formed at the upper end of the rotating body (13) protruding from the upper surface of the gear box (12), and two rotation transmission pins (34) are formed on the flange (33) as shown in FIGS. On the other hand, a flange (35) is formed at the lower end of the cylindrical columnar material connecting cap (10) connected to the lower end of the output shaft (9), and the flange (35) As shown in FIG. 4, the rotation transmission pins (34), (34) and the detachable rotation transmission sleeves (36), (36) are positioned on the lower surface of the pins corresponding to the pins (34), (34). It protrudes downward.

  As a means for raising and lowering the rotation assisting device (A), as shown in FIG. 1, a gear box (12) is suspended by a wire rope (39), and the wire rope (39) is crawled through a top sheave (1 ) Is connected to a winch (not shown).

  In FIG. 4, a plurality of locking grooves (37), (37) extending in the busbar direction are formed on the inner peripheral surface of the columnar member connection cap (10), and the upper end outer periphery of the steel pipe pile (11) is formed. A plurality of locking ridges (38), (38) are projected on the surface, and the upper end portion of the steel pipe pile (11) is inserted into the cap (10) and the locking ridges (38), (38) Are engaged with the engaging grooves (37) and (37) so as to be able to transmit rotation.

  The operation of the above example will be described next. With the rotation auxiliary device (A) lowered near the lower end of the leader mast (2), the motor (5) of the rotation drive unit (4) is started and the steel pipe pile (11) is rotated to return to the ground Start press-fitting. During the press-fitting, when the rotation of the steel pipe pile (11) is stopped by gravel in the ground, first, the rotation auxiliary device (A) is raised to the connection cap (10) by winding the wire rope (39). The rotation transmission pins (34), (34) are inserted into the rotation transmission sleeves (36), (36) of the connection cap (10).

  In this state, the motor (5) of the drive unit (4) is restarted to transmit the rotation to the steel pipe pile (11), and at the same time, one of the swing hydraulic cylinders (28), (28) is driven to extend and the other is driven. The swinging body (23) is rotated by a predetermined angle in the counterclockwise direction in FIG. 3 by reducing driving, and the claw wheel (25) is rotated in the same direction by the claw (26). ), Rotation transmission pins (34), (34) and sleeves (36), (36), and then via the connection cap (10), the steel pipe pile (11) is urged so that the steel pipe pile (11) It is possible to exceed the static friction load.

  When the load cannot be exceeded by a single swing of the swing body (23), one of the hydraulic cylinders (28), (28) is driven to contract and the other is extended to drive the swing body (23) as shown in FIG. The rocking may be intermittently repeated by rotating it back a predetermined angle in the clockwise direction.

  When the steel pipe pile (11) exceeds the load of gravel and the like and is rotated only by the rotational force of the motor (5) of the drive unit, the ratchet wheel (25) is attached to the steel pipe pile (11) with the claw ( 26)... Is rotated while being fed and is not subjected to braking action, and after confirming the normal rotation of the steel pipe pile (11), the rotation auxiliary device (A) is lowered to the original lower position and rotated. The transmission pins (34) and (34) may be detached from the sleeves (36) and (36), and the operation is easy.

It is a side view of the steel pipe pile rotary press machine provided with the rotation auxiliary device by the present invention. It is an enlarged plan view of a rotation auxiliary device. It is a cross-sectional top view of a rotation assistance apparatus. It is an expansion partial vertical side view of a columnar material connection cap part. It is the VV line expanded sectional view of FIG.

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 23 Oscillating body 25 Claw wheel 26 Claw 28 Oscillating hydraulic cylinder 34 Rotation transmission pin 36 Rotation transmission sleeve 39 Wire rope

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 on the leader mast so that it can be raised and lowered and cannot be turned,
The rotation assist device is
Each of the rotating body surrounding the columnar member and an annular rocking body located concentrically outside the rotating body has a rotatable structure.
Oscillating drive means for oscillating the oscillating body;
A one-way clutch mechanism is provided that connects the rocking body and the rotating body to transmit the rocking to the rotating body when the rocking body swings in one direction, and releases the connection when rocking in the other direction.
Equipped with elevating means for elevating and lowering the rotation auxiliary device along the leader mast, and connecting means for detachably connecting the rotating body with the output shaft of the rotation drive unit when ascending.
Rotation assist device for columnar material rotary press-fitting machine.

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