JP2860978B2 - Suspended excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension type excavator suitable for use in a place having a limited head.

[0002]

2. Description of the Related Art Among excavators used for underground wall construction,
A suspended excavator that is hung by a crawler crane or the like is designed to excavate a ditch by opening and closing hydraulically a shell provided at the lower end of the excavator. Easy to ensure excavation accuracy.

[0003]

However, when the length of the machine is increased, the boom of the excavator or the crane that lifts the excavator interferes with the overhead overhead line in a place having a head height of about several meters or less, for example, in a yard. In addition, there was a problem that the crane operation could not be performed, and as a result, excavation work became impossible.

[0004] The present invention has been made in view of the above circumstances, and provides a suspension type excavator that can perform excavation work in a place with a limited head space while ensuring predetermined excavation accuracy. Aim.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a suspension type excavator which opens and closes a pair of shells at a lower end of a glove body suspended by a crane or the like. In a suspended excavator in which the shell and the grab body are connected freely by an opening / closing hydraulic cylinder, a fixed guide protector is mounted on both sides of the grab body, and a lift extending upward from the fixed guide protector. The movable guide protector is disposed substantially vertically, a predetermined movable guide protector is slidably mounted along the lifting guide, and a lifting hydraulic cylinder for raising and lowering the movable guide protector is provided inside the movable guide protector. Things.

Further, the suspension type excavator according to the present invention is characterized in that
Is formed from a solid body.

[0007] The suspension type excavator of the present invention is characterized in claim 1.
A predetermined widening attachment is detachably provided on the side of the fixed guide protector and the movable guide protector.

[0008]

In the suspension type excavator of the present invention, first, the movable guide protector is suspended by a predetermined crane with the movable guide protector lowered. In this state, the machine length is considerably shorter than that of the conventional suspended excavator.

After being suspended in the excavation trench, the lifting hydraulic cylinder is operated. Then, the cylinder pushes the movable guide protector upward, and the movable guide protector moves upward along the elevating guide. And a predetermined space is secured between the fixed guide protector.

Next, the ground is excavated by operating the opening / closing hydraulic cylinder to open / close the shell.
Since the movable guide protector and the fixed guide protector are in contact with the inner surface of the excavation hole wall at a predetermined interval in the vertical direction, the excavation posture is stabilized as in the case of the suspension excavator having a long length.

After the excavation is completed, the lifting hydraulic cylinder is operated in the reverse direction to return the movable guide protector to its original position.
Hoist the crane's wire with the PIC short and lift it to the ground.

When the above-mentioned glove body is formed of a solid body, the weight of the entire excavator is increased, and the excavating ability is improved.

When the widening attachment is configured to be detachable on the side of the fixed guide protector and the movable guide protector, a gut having a width wider than usual can be excavated.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a suspension type excavator according to an embodiment of the present invention.

FIG. 1 is a front view and a plan view of a suspension type excavator 1 according to this embodiment, and FIG. 2 is a side view of the same. As can be seen from these figures, the suspension type excavator 1 of this embodiment has a pair of shells 3, 3 openably and closably disposed at the lower end of a glove body 2 suspended by a crane or the like. 3 and the glove body 2 are connected by opening and closing hydraulic cylinders 4 and 4.

Although the suspension type excavator 1 of this embodiment is shorter than the conventional suspension type excavator by about 2 m in length, the glove body 2 is made of a solid body in order to compensate for the weight reduction due to the shortening. And the weight of the entire excavator is increased to about twice that of the conventional excavator.

A fixed guide protector 5 having a substantially U-shaped horizontal cross section is mounted on both sides of the glove body 2, and two elevating guides 6 extending upward from the fixed guide protector 5 are provided almost every two. It is juxtaposed vertically. The elevating guide 6 is a rod having a substantially circular cross section, and is fixed to the glove main body 2 via an upper bracket 9 and a lower bracket 10 protruding from both sides of the glove main body 2.

Above the fixed guide protector 5, a movable guide protector 7 having substantially the same shape as the fixed guide protector 5 is provided. The movable guide protector 7 is slidably mounted along the elevating guide 6 as can be clearly seen from the plan view, and is moved up to a position indicated by a virtual line in the front view.
Move about 00mm. Further, a hydraulic cylinder 8 for elevating and lowering the movable guide protector 7 is provided inside the movable guide protector 7.

In the suspension type excavator 1 of this embodiment, as shown in FIG. 3, first, the movable guide protector 7 is suspended by the crane 51 with the movable guide protector 7 lowered. In this state, the machine length is considerably shorter than that of the conventional suspended excavator.

The crane 51 shown in FIG. 1 is a crane developed especially so that it can be used in a place where head space is limited. The configuration and operation of the crane 51 will be described briefly.

The crane 51 includes a crawler type traveling body 52.
An upper revolving body 53 is mounted on the upper revolving body 53 so as to be freely rotatable, and a boom support 54 having a substantially inverted triangular shape is mounted on the upper revolving body 53. Here, the boom support 54 is formed of, for example, a truss, and its lower end 55 is hinged to the upper swing body 53. And it can rotate about the horizontal axis centering on this hinge.

On the other hand, a telescopic boom 56 is provided above the upper swing body 53. The telescopic boom 56 is supported by the boom support 54 from a position near the center to a position slightly toward the center, and a lower boom 57 fixed to the boom support 54.
And the boom telescopic cylinder 5 guided by the lower boom 57
8 and an upper boom 59 driven to expand and contract in the axial direction.

A boom raising / lowering cylinder 61 is provided behind the boom support 54, and its tip is connected to the vicinity of the rear end of the lower boom 57. With this configuration, when there is enough head space, the boom up / down cylinder 61 is operated to raise / lower the telescopic boom 56 by about 15 °, so that the head can be at least slightly secured.

A wire rope hoisting winch 60 is disposed substantially at the center of the upper swing body 53, and a boom telescopic cylinder 58, a boom up / down cylinder 61, or the suspension type excavator of this embodiment is provided at the rear. A hydraulic unit 62 serving as a hydraulic source of the machine 1 is provided. A cable reel 63 for winding up a cable for transmitting and receiving a predetermined control signal to and from the suspended excavator 1 and a hose for feeding oil to the suspended excavator 1 are wound behind the telescopic boom 58. A hydraulic hose reel 64 for taking out is attached. In consideration of use in a narrow place, it is preferable to make the hydraulic unit 62 compact as a driving method using the main body motor and to reduce the turning radius.

In the crane 51, the telescopic boom 56 is supported by the boom support 54 from the vicinity of the center to the center and slightly rearward, and is supported by the boom hoist cylinder 61 near the rear end. Therefore, the distance between the two points supporting the telescopic boom 56 is considerably wider than that of the conventional crane, and the structure can resist a large moment.

Therefore, it is possible to support a considerable hanging load in a state where the telescopic boom 56 is leveled without raising and lowering, and even in a place where the head height is limited to, for example, 4 to 5 m. By using the crane 51, the suspended excavator 1 of the present embodiment, whose machine length is reduced, can be suspended.

Now, the wire of the crane 51 is unwound and the suspension type excavator 1 is suspended in the trench 21 for the underground continuous wall to perform excavation. The hydraulic guide cylinder 8 is operated to push up the movable guide protector 7 upward. Then, the movable guide protector 7 moves upward along the elevating guide 6, and a predetermined space is secured between the movable guide protector 7 and the fixed guide protector 5.

In this state, the opening / closing hydraulic cylinder 4 is operated to open / close the shell 3 to excavate the ground. During excavation, the movable guide protector 5 and the fixed guide protector 7 are spaced at a predetermined interval in the vertical direction. And abuts against the inner surface of the wall of the excavation hole, so that the excavation posture is stabilized as in the case of the suspension type excavator having a long length.

After the excavation, the lifting hydraulic cylinder 8 is operated in the reverse direction to return the movable guide protector 7 to the original position, and the wire of the crane 51 is wound up and lifted on the ground with the machine length shortened.

As described above, according to the suspension type excavator of the present embodiment, during excavation, the movable guide protector is slid upward by about 800 mm to secure an interval with the fixed guide protector. Excavation accuracy equivalent to that of the conventional machine with a long captain can be secured, and on the ground, the movable guide protector is returned to its original length to shorten the captain to about 3 m. Excavation work can also be performed in places with limited heads, such as below.

Further, in order to compensate for the weight reduction due to the shortening of about 2 m as compared with the conventional suspended excavator, the grab body is constituted by a solid body, so that the weight of the entire excavator is twice as large as that of the conventional excavator. This makes it possible to efficiently excavate even on hard ground.

That is, according to the suspension type excavator of the present embodiment, the excavation of the GL-50m class in a place where the head space is limited, which was impossible with the conventional excavator, can be performed with sufficient excavation accuracy and excavation efficiency. It becomes possible.

Although not specifically mentioned in the above embodiment,
As shown in FIG. 4, if a widening attachment 31 having a thickness of about 200 mm is configured to be detachable on the sides of the fixed guide protector 5 and the movable guide protector 7,
It is possible to excavate a gut having a standard size, for example, about 1800 mm width without attaching the attachment 31, and to excavate an extended size, for example, a gut having a width of about 2200 mm with the attached gut. No need to replace. In this case, the movable guide protector 7 can be moved up and down together with the attachment 31 attached to the movable guide protector 7 to improve excavation accuracy.

Further, in this embodiment, an example in which the specified crane is used has been described. However, any crane that can be used in a place having a limited head space may be used. For example,
A crane running on a rail laid along the excavation trench may be used.

Although the suspension type excavator of the present embodiment has been developed so as to be adapted to a place where the head is restricted, it goes without saying that it may be used in a place where the head is not restricted. Nor. Even in such a case, there is an effect that the transportation and other handling become easy by shortening the machine length.

[0036]

As described above, in the suspension type excavator of the present invention, a pair of shells is provided at the lower end of a glove body suspended by a crane or the like so as to be freely opened and closed, and the shell and the glove body are connected to each other. Are fixed by a hydraulic cylinder for opening and closing, a fixed guide protector is mounted on both sides of the glove body, and an elevating guide extending upward from the fixed guide protector is disposed substantially vertically, and a predetermined movable A guide protector is slidably mounted along the elevating guide, and a hydraulic cylinder for elevating the movable guide protector is provided inside the movable guide protector. Excavation work can be performed in a place where there is.

[0037]

[Brief description of the drawings]

FIG. 1A is a front view of a suspended excavator according to the present embodiment,
(b) is a plan view of the same.

FIG. 2 is a side view of the suspension type excavator according to the embodiment.

FIG. 3 is a view showing a state in which the suspension type excavator according to the embodiment is suspended by a crane.

FIG. 4 is a front view showing a modification of the suspension type excavator according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension type excavator 2 Grab main body 3 Shell 5 Fixed guide protector 6 Elevating guide 7 Movable guide protector 8 Elevating hydraulic cylinder 31 Widening attachment 51 Crane 52 Crawler (traveling body) 53 Upper rotating body 54 Boom support 56 Telescopic boom 58 Boom telescopic cylinder 61 Boom hoist cylinder

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Nakajima 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-4-106227 (JP, A) JP-A-Hei 4-115025 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02F 3/47 E02F 5/02

Claims (3)

(57) [Claims] 1. A suspended excavator in which a pair of shells is provided at the lower end of a grab body suspended by a crane or the like so as to be openable and closable, and the shell and the glove body are connected by a hydraulic cylinder for opening and closing. A fixed guide protector is mounted on both sides of the grab body, and an elevating guide extending upward from the fixed guide protector is disposed substantially vertically, and a predetermined movable guide protector is slidably mounted along the elevating guide. And a lifting hydraulic cylinder for raising and lowering the movable guide protector is provided inside the movable guide protector. 2. The suspension type excavator according to claim 1, wherein said glove body is formed of a solid body. 3. The suspension type excavator according to claim 1, wherein a predetermined widening attachment is detachably provided on a side of the fixed guide protector and the movable guide protector.