JPS6239185Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth auger, and more particularly to an earth auger equipped with a counterweight.

In the earth auger, an auger screw is connected to a drive unit that moves up and down along a leader mast that is installed upright, and the auger screw is lowered while being rotated to excavate a vertical hole underground. If the material is hard, the weight of the drive unit applied to the auger screw may not be enough, resulting in a sudden drop in digging speed or inability to excavate.

For this reason, a conventional excavation machine has been proposed in which the drive unit of the auger screw is suspended midway along a boom extending obliquely upward from the work machine, and a weight is suspended at the tip of the boom to apply a load to the auger screw connected to the drive unit, thereby dealing with excavation of hard ground (see Japanese Patent Application Laid-Open No. 1977-2003).
(Publication No. 58205).

However, in the conventional configuration described above, since the weight is suspended at the tip of the boom, it is necessary to extend the boom itself further forward from the position where the drive part is suspended, and at the same time, it is necessary to have sufficient strength to suspend the weight. In addition, since the weights are suspended using wire ropes, it is necessary to attach a lifting device, which makes the configuration including the boom itself extremely complicated, especially since the tip of the boom is extended. The excavation work location is restricted, and since the weight is suspended by a wire rope, there are various practical drawbacks such as the difficulty of applying a stable load to the auger screw due to vibration.

In addition, as described above, the drive unit is suspended from the tip of the boom, and the platform scale weights are fitted from the side into the upper shaft of the auger screw connected to the drive unit, and a plurality of these weights are stacked. A load applying means has been proposed in which the bolts are fastened by bolts that pass through the top and bottom (Japanese Utility Model Publication No. 144703/1983).

However, with the above configuration, a large number of weights are piled up and mounted on the shaft of the auger screw, so there is a deadweight in the length direction of the auger screw corresponding to the total height of the weights and the tightening allowance of the bolt. This inevitably results in an impact on the suspension height of the auger screw, and if a leader mast of the same height is used, the actual length of the auger screw will be correspondingly shorter. This type of drilling machine has some undesirable drawbacks.

In view of this, in the present invention, weights that apply a load to the auger screw are removably attached to both sides of the outer shell of the drive unit that connects the auger screw as a pair on the left and right sides with respect to the axis of the auger screw. The purpose of the present invention is to provide an earth auger that does not require any change in the structure of the earth auger, is easy to attach and detach, and increases the weight of the drive part, making it possible to excavate in hard ground etc. with high efficiency. It has been done.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

First, the earth auger to which this invention is applied is the first
As shown in the figure, guides 5, 5 on the back side of the drive unit 4 are installed along a guide rail 3 provided vertically in the front face of a leader mast 2 that is supported upright in the work machine 1. An auger screw 6 is connected to the lower part to give rotation to it,
A wire 8, which is wound up and down by a winch on the working machine 1, is wound around a sheave 7 attached to the upper part of the drive section 4, so that the drive section 4 is suspended so as to be able to rise and fall.

Counterweights 10, 10 are detachably attached to the drive unit 4 of the earth auger as described above.

2 to 5 show the main parts of the present invention. The counterweights 10, 10 consist of a pair of left and right counterweights. These counterweights 10, 10 have a vertically long rectangular shape, and bolt insertion holes are provided at the four corners of the counterweights 10, 10. 11,
11... are formed, and the bolts 13, 13... inserted into the bolt insertion holes 11, 11... are screwed into threaded holes formed on the side surface of the drive unit 4. It is installed by doing.

Note that the counterweights 10, 10 have a bent portion 14 at the upper end that engages with the side upper surface of the drive portion 4 as shown in the sixth figure, and if this is engaged with the upper surface, the counterweight can be 10,10
This has the advantage of ensuring reliable weight support and increasing weight at the same time.

Since the present invention has the above configuration, the counterweights 10, 10 and the drive section 4 are separated and transported separately to the excavation work site, and then installed at the work site. In this case, the counterweights 10 and 10 are not installed in consideration of the fact that the soil is relatively soft at the beginning of the excavation, and that the stability of the leader mast 2 is taken into account when the drive unit 4 is in a high position at the beginning of the excavation. It can be attached and used when the drive unit 4 reaches a low position as the work progresses or when unexpected hard ground is encountered.

Therefore, according to the present invention, it is possible to increase the total weight of the drive unit by attaching counterweights 10, 10 to the outer surface of the outer shell of the drive unit as necessary, so that optimum excavation can be carried out depending on the soil quality of the excavated ground. Moreover, since the counterweight is mounted on the left and right sides using the wide play surface on the side, heavy objects can be mounted, and since the counterweight is mounted on the side of the drive unit, it cannot be attached to other machines or components. It can be installed without getting in the way, and installation and removal operations are easy. In particular, by forming a pair of left and right counterweights and attaching them separately, the weight per counterweight is halved, making it easier to attach and detach, and also prevents the left and right balance of the drive unit from being lost. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an earth auger to which the present invention is applied, FIG. 2 is a front view showing an embodiment of the present invention, FIG. 3 is a side view, FIG. 4 is a plan view, and FIG. The figure is a perspective view showing one of the counterweights,
FIG. 6 is a perspective view showing the modified example. 1... Working machine, 2... Leader mast, 3...
Guide rail, 4... Drive unit, 5... Guide, 6
... Auger screw, 10 ... Counterweight, 11 ... Bolt insertion hole, 12 ... Recess, 13
……bolt.

Claims (1)

[Scope of utility model registration request] A grounding device that has a leader mast and a drive unit that moves up and down along the leader mast and has a drive mechanism such as a motor and a speed reducer mounted therein, and connects an auger screw to the output shaft at the bottom to rotate it. An earth auger characterized in that a pair of left and right counterweights are removably attached to the left and right sides of the outer shell of the drive unit using fasteners such as bolts.