JP2684131B2 - Excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for excavating grooves, holes, etc. in the ground.

[0002]

2. Description of the Related Art Conventionally, an excavator 1 as shown in FIGS. 8 and 9 has been used as a method for excavating trenches or the like in the ground when constructing underground continuous walls and the like.

This excavator 1 is provided with two pairs of left and right cutter drums 3 and 4 supported by a frame 2 arranged in the center, and these cutter drums 3 and 4 are rotated to excavate the natural ground at the same time. The ditch is filled with muddy water, and the excavated earth and sand is sucked up and discharged along with the muddy water to form a ditch.

Due to the structure of the excavator 1, the earth and sand located below the frame 2, that is, below the space between the pair of left and right cutter drums 3, 4 remains unexcavated. It was

Therefore, in order to solve this, a plurality of cutter pieces 5 for excavating the remaining earth and sand portion are provided at the inner peripheral edge portions 3a and 4a of the cutter drums 3 and 4, or the remaining earth and sand is left. It has been proposed to provide the third cutter drum 6 exclusively for excavating the above portion (see FIG. 9).

The cutter piece 5 is tilted toward the space between the cutter drums 3 and 4 only while it is positioned below the cutter drums 3, that is, during excavation, as the cutter drums 3 and 4 rotate. It was configured to be swingable.

[0007]

However, separately excavating only the remaining portion of the earth and sand has a drawback that the excavation work becomes complicated, and the provision of the cutter piece 5 for excavation is structurally difficult. It became complicated and was not desirable.

Further, the excavator 1 has, for example, a width a of 1 m, a length b of 3 m, and a height c of 5 to 6 m, on which the third cutter drum 6 is provided. However, there is a drawback that the device becomes larger and the handling thereof becomes inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an excavator that can be constructed with sufficient strength and that can be handled and excavated easily. .

[0010]

According to the present invention, in order to achieve the above object, a pair of left and right cutter drums are supported by a frame arranged in the center, and the pair of cutter drums are rotated to fill mud water. While in the excavator that excavates earth and sand to form a groove, a central cutter drum formed with a small diameter or a large diameter is extended at the inner peripheral end of one of the left and right cutter drums, and the center The cutter drum covers the circumference of the space between the left and right cutter drums, and an annular opening that opens in one direction is provided between the inner peripheral end of the other cutter drum and the central cutter drum. The pair of left and right cutter drums are bent into a shape and support the left and right cutter drums through the annular opening. The sediment that is located so that drilling.

[0011]

Embodiments of an excavator according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 7 show an embodiment of the present invention. The excavator 10 of the present embodiment has a pair of left and right front cutter drums 12, 1 by a frame 11 arranged in the center.
3 and the rear cutter drums 14 and 15 are supported.

A central front cutter drum 16 having a large diameter is integrally extended to the inner peripheral end portion 12a of the front cutter drum 12, and the inner peripheral end portion 13a of the other front cutter drum 13 and the central front cutter drum 16 are integrally formed. An annular opening 17 is provided between 16.

Thus, the left and right front cutter drums 12, 1
The periphery of the space between the three is covered by the central front cutter drum 16.

Inner peripheral end portion 1 of one rear cutter drum 14
4a is left as it is, and a central rear cutter drum 18 having a small diameter is integrally extended to the inner peripheral end portion 15a of the other rear cutter drum 15, and the inner peripheral end portion 14a of the rear cutter drum 14 and the central rear cutter portion 14a are integrally formed. An annular opening 19 is provided between the drums 18.

Thus, the left and right rear cutter drums 14, 1
The periphery of the space between the five is covered by the central rear cutter drum 18.

As shown in FIG. 2, the frame 11 includes a front support portion 20 and a rear support portion 21 at its lower portion. The front support portion 20 supports the front cutter drums 12, 13, 16 and the rear support portion 21. By the rear cutter drum 14, 15,
Support eighteen.

That is, as shown in FIG.
The one front support portion 20 and the one rear support portion 21 are bent in opposite directions in a substantially crank shape, and the respective bent portions 20a and 21a are passed through the annular openings 17 and 19, respectively.

As a result, the front support portion 20 of the frame 11 is
A lower portion 20b of the rear cutter 21 is disposed between the front cutter drums 12 and 13, and a lower portion 21b of the rear support portion 21 of the frame 11 is disposed between the rear cutter drums 14 and 15.

Lower portions 20b of the front and rear supporting portions 20 and 21,
A hydraulic motor 22 that rotationally drives the front cutter drums 12 and 13 and a hydraulic motor 23 that rotationally drives the rear cutter drums 14 and 15 are mounted on 21b.

Front and rear cutter drums 12, 16, 13, 1
5 and 6 are provided on the peripheral surfaces of 4, 18, and 15, respectively.
As shown in, a plurality of cutter blades 24 are provided so as to project.

Front and rear cutter drums 12, 16, 13, 1
As shown in FIG. 6, 4, 18 and 15 are arranged so as to be meshed with each other while being separated from each other so that the plurality of cutter blades 24 do not hit each other.

FIG. 7 shows the front and rear cutter drums 12, 16,
An example of an array of a plurality of cutter blades 24 provided on the peripheral surfaces of 13, 14, 18, and 15 is shown. In this example, the cutter blades 24 are arranged in a plurality of rows in a substantially V shape.

On the frame 11, as shown in FIG.
Base plate 11a for mounting and supporting the excavation assisting device 25
Are provided substantially horizontally.

The excavation assisting device 25 is provided with an electric pump 27 for sucking excavated earth and sand and muddy water on the ground in a housing 26, an electric hydraulic pump unit 28, and an equipment operation box 29.

At each of the front, rear, left and right side surfaces of the housing 26, an attitude control device 30 for controlling the attitude of the excavator is provided.

Cutter drums 12, 16, 13, 14, 1
The hydraulic motors 22 and 23 for rotating the motors 8 and 15 and the attitude control device 30 are driven by an electric hydraulic pump unit 28.

The attitude control device 30, as shown in FIG.
If necessary, the hydraulic cylinder 30a causes the guide plate 30b to project or retract to operate so that the posture of the excavator with respect to the excavation groove is always properly maintained.

The mouth of the suction pipe 27a of the electric pump 27 is opened below the base plate 11a through a hole 11b formed in the base plate 11a.

In FIG. 1, 31 is a delivery pipe for guiding the excavated soil and the like sucked up by the pump 27 to the ground, 32 is a power supply to each equipment operation box 29, and various kinds of communication with the operation panel on the ground. Cable, 3
Reference numeral 3 is a pulley arranged on the upper surface of the housing 26, and 34 is a cable that is hung on the pulley 33 to lift the excavator with a crane or the like.

The above excavator is to be constructed at
Lifted by a crane, front and rear cutter drums 12, 16,
While rotating 13, 14, 18 and 15, the ground is excavated to a predetermined depth.

At that time, muddy water is injected into the excavated ditch or hole to prevent the ground from collapsing, and the excavated earth and sand is fluidized by the muddy water and guided to the ground by a pump. Can be formed.

At this time, the front and rear cutter drums 16, 1
8 also excavates the earth and sand located below the space between the left and right front cutter drums 12, 13 and the left and right rear cutter drums 14, 15.

[0034]

As described above, according to the excavator according to the present invention, the pair of left and right cutter drums are supported by the frame arranged in the center, and the pair of cutter drums are rotated to fill the muddy water. While in the excavator that excavates earth and sand to form a groove, a central cutter drum formed with a small diameter or a large diameter is extended at the inner peripheral end of one of the left and right cutter drums, and the center The cutter drum covers the space between the left and right cutter drums, and an annular opening that opens in one direction is provided between the inner peripheral end of the other cutter drum and the central cutter drum. It is bent into a shape and supports a pair of left and right cutter drums through the annular opening, so that it is positioned below the space between the left and right cutter drums by the central cutter drum. Since so as to excavate earth and sand to be conventional as, or provided with cutter piece for drilling, it is unnecessary to or providing the third blade drum. Further, since the concavities and convexities of the left and right excavated cross sections can be used to join the next element, it is not necessary to use a rocking pipe or the like as in the conventional method.

As a result, the excavator is structurally simple, there is no problem in strength, and it is possible to reduce the size of the excavator and to handle it easily. Therefore, excavation work can be performed easily and quickly. You can

[Brief description of the drawings]

FIG. 1 is a perspective view conceptually showing an embodiment of an excavator of the present invention.

FIG. 2 is a view conceptually showing a side surface of the excavator of FIG.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a sectional view conceptually showing the front and rear cutter drums of the excavator shown in FIG.

FIG. 6 is a view conceptually showing an outer appearance of front and rear cutter drums of the excavator shown in FIG. 1.

7 is a view conceptually showing an arrangement of cutter blades of front and rear cutter drums of the excavator shown in FIG.

FIG. 8 is a perspective view showing a conventional excavator.

FIG. 9 is a conceptual diagram showing another conventional excavator.

[Explanation of symbols]

 10 excavator 11 frame 12,13 front cutter drum 14,15 rear cutter drum 16,18 central front and rear cutter drum 17,19 annular opening 20 front support 21 rear support

Claims (1)

(57) [Claims] 1. An excavator for supporting a pair of left and right cutter drums by a frame arranged in the center, rotating the pair of cutter drums, and excavating earth and sand while filling mud water to construct a groove. A central cutter drum having a small diameter or a large diameter is extended at the inner peripheral end of one of the cutter drums, and the central cutter drum covers the circumference of the space between the left and right cutter drums. An annular opening that opens in one direction is provided between the inner peripheral end of the other cutter drum and the central cutter drum, the frame is bent into a substantially crank shape, and a pair of left and right cutter drums are inserted through the annular opening. The excavation is characterized in that the central cutter drum excavates earth and sand located below the space between the left and right cutter drums. Machine.