JP4425084B2 - Auger head changer - Google Patents

Description

  The present invention relates to an auger head exchanging device that is provided in an excavating apparatus equipped with an earth auger and used when exchanging an auger head at the tip of an earth auger.

When a pile such as a steel sheet pile is press-fitted into the hard ground, a press-fitting machine equipped with an earth auger is used, and the hard ground is excavated with the earth auger before the pile is press-fitted. In this excavation work, the auger head attached to the tip of the earth auger excavates the hard ground and is severely worn and must be periodically replaced.
In this auger head replacement operation, an auger head replacement device has been conventionally used. For example, in the apparatus shown in Patent Document 1, a bracket is provided in a press-fitting machine, the bracket and the arm are fixed by a pin so as to be pivotable in the horizontal direction, and an extension extending substantially horizontally from the arm and the auger head support base. The protruding portion is fixed by a pin so as to be rotatable in the horizontal direction. Further, the auger head support base is provided with a head support portion provided with a mechanism for installing the auger head and rotating it horizontally.
JP 2002-81286 A

In the above apparatus, since the arm is attached to the saddle of the press-fitting machine, the arm becomes long and heavy, and it is difficult to lift it by one worker. Moreover, since the arm is attached to the saddle, the device protrudes to the side of the press-fitting machine, so that the posture of transporting and storing the press-fitting machine has been deteriorated. Furthermore, there was a problem that it interfered with other work at the work site.
In addition, because of its heavy weight, large bolts were used for attachment to the saddle, and the mounting bolts were damaged due to overload when the auger head was replaced.

  The present invention has been made in view of the above points, and provides an auger head exchanging device that allows an operator to easily and safely exchange an auger head with a simple configuration and shortens the working time.

  The gist of the present invention is that a horizontal arm is attached to a mast of a press-fitting machine so as to be rotatable in a horizontal direction, a suspension arm is attached to a tip of the horizontal arm, and a support arm is attached to a lower end of the suspension arm in a horizontal direction. The auger head exchanging apparatus has a head support base on which the auger head is placed and fixed to the tip of the support arm.

The place where the gist of the present invention, mounted for vertical movement of the support arm relative to the suspension arm, and with the suspension arm attaching the cushioning material to absorb the overload, the head supporting base to the support arm It is in the constructed auger head changer.

Further it is an aspect of the present invention, fitted with a horizontal arm freely horizontally pivoted into the press machine, it is attached to suspension arms at the distal end of the horizontal arm, in the suspended lower arm cushioning material for absorbing the overload A support arm is attached to the lower end of the suspension arm so that the support arm can be rotated in the horizontal direction and moved vertically with respect to the suspension arm, and a head support base for placing the auger head is attached to the tip of the support arm. Located on a fixed auger head changer.

Since the present invention is configured as described above, the auger head can be easily replaced by a single worker with a simple structure and light weight, the replacement work is safe, and the work time can be shortened.
Furthermore, since the exchange device is attached to the mast, the carrying and storing posture of the press-fitting machine is improved, and it does not interfere with other operations.
In addition, since the weight of the device is light, a small bolt can be used for attachment to the mast, and there is an effect that the bolt is not damaged due to overload when the auger head is replaced.

In the best mode for carrying out the present invention, a horizontal arm is attached to the tip of the mast of the press-fitting machine so as to be rotatable in the horizontal direction, a suspension arm is attached to the tip of the horizontal arm, and supported at the lower end of the suspension arm. The arm is mounted so as to be pivotable in the horizontal direction, and an inner shaft fixed to the support arm is inserted into the outer cylinder of the suspension arm, and a spring is wound around the inner shaft. Is always urged upward by the spring, so that the support arm is movable in the vertical direction with respect to the suspension arm. Furthermore, the auger head exchanging device is provided with head support bases on which the auger head is placed fixed at both ends of the support arm.

The structure of the auger head exchange apparatus 1 of a present Example is demonstrated based on figures.
FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a plan view showing an embodiment of the present invention.

  An auger head 92 is fixed to the lower end of an earth auger (not shown) attached to the chuck 3 of the press-fitting machine 1 via a screw 4.

A horizontal arm 11 is attached to a lower end of the mast 2 of the press-fitting machine 1 by a pin 21 so as to be rotatable in a horizontal direction. A suspension arm 13 and a support arm 17 are attached to the end of the horizontal arm 11.
An inner shaft 13b fixed to the support arm 17 is inserted into the outer cylinder 13a of the suspension arm 13, and a spring 15 as a cushioning material that absorbs overload is wound around the inner shaft 13b. Since the inner shaft 13b is always urged upward by the spring 15, the support arm 17 is attached to the suspension arm 13 so as to be movable up and down.

  A support arm 17 is attached to the lower end of the inner shaft 13b of the suspension arm 13 so as to be rotatable in the horizontal direction, and head support bases 19 are fixed to both ends of the support arm 17, respectively.

An auger head replacement operation using the present embodiment configured as described above will be described.
First, the auger head 92 to be replaced is held at a constant height by raising the screw 4 indirectly fixed to the chuck 3 of the press-fitting machine 1.
Thereafter, the horizontal arm 11 and the support arm 17 are rotated in the horizontal direction, and the head support base 19 at the tip of the support arm 11 is disposed just below the auger head 92 to be replaced. The auger head 92 is removed from the screw 4 to support the head. Place it on the table 19.

On the other hand, a new auger head 91 is placed on the other head support base 20 in advance. After that, the auger head 92 to be replaced is removed as described above and placed on the head support base 19 before the support arm 17. Is rotated horizontally.
As a result, the auger head 92 to be exchanged is carried to the outside of the press-fitting machine 1 and a new auger head 91 is carried just below the screw 4.

  Thereafter, the screw 4 is lowered and the auger head 91 is attached to the lower end thereof. When the auger head 91 is attached to the screw 4, a force from the screw 4 is applied to the auger head 91 from above.

The conventional exchange device has a large structure with strength to withstand the force of the screw 4.
However, in this embodiment, the support arm 17 is always urged upward by the spring 15 wound around the inner shaft 13b, and the support arm 17 is attached to the suspension arm 13 so as to be movable in the vertical direction. Yes. Therefore, when an excessive pressing force is applied from above, the inner shaft 13b and the support arm 17 descend against the elastic force of the spring 15 to absorb the force from above, and the exchange device itself It is configured to prevent damage. Therefore, in this embodiment, the components such as the suspension arm 13 and the support arm 17 can be made with a small size which is not high in strength as compared with the conventional example.

  As described above, according to the present embodiment, it is possible to provide an auger head exchanging apparatus that has a simple configuration, can safely perform an auger head exchanging operation with a simple operation, and can shorten the working time.

The front view which shows one Example of the auger head exchange apparatus of this invention The top view which shows one Example of the auger head exchange apparatus of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-fitting machine 2 Mast 3 Chuck 4 Screw 11 Horizontal arm 13 Suspension arm 15 Spring (buffer material)
17 Support arm 19 Head support 91 Auger head 92 Auger head

Claims (3)

  A horizontal arm is attached to the mast of the press-fitting machine so as to be pivotable in the horizontal direction, a suspension arm is attached to the tip of the horizontal arm, and a support arm is attached to the lower end of the suspension arm so as to be pivotable in the horizontal direction. An auger head changer in which a head support for placing the auger head is fixed to the tip of the auger head. The mounting of the support arm so as to be vertically moved relative to the suspension arm, and the suspension arm is attached a cushioning material for absorbing the overload, the support according to claim 1 wherein the auger head which constitutes the head supporting base to the arm Exchange equipment. Mounting the horizontal arm to be freely horizontally pivoted into the press machine, fitted with a suspension arm to the tip of the horizontal arm, in the suspended lower arm is attached a cushioning material for absorbing the overload, the lower end of the suspended lower arm An auger head exchanging device in which a support arm is attached so as to be rotatable in the horizontal direction and movable in a vertical direction with respect to a suspension arm, and a head support base on which the auger head is placed is fixed to the tip of the support arm.

Images