JP2002088793A - Excavating device provided with crane device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate housing and takeout operations of an excavating device whose bucket link is retractably provided with a crane device. SOLUTION: The bucket 13 supported on an arm 12 so as to oscillate freely and a bucket cylinder 16 for oscillating the bucket 13 are coupled together through a link 31, and the crane device 40 is pivotally connected to the link 31 so as to oscillate freely about a shaft 22. A holding pin 36 is fixed to the link 31, the axial-center direction X of the holding pin 36 is set approximately along the oscillating direction A of the crane device 40, and the holding pin 36 is inserted into a hook 43 by an operation for oscillating the crane device 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator used for a backhoe, a power shovel, and the like, and more particularly to an excavator integrally provided with a crane device.

[0002]

2. Description of the Related Art Conventionally, by providing a crane function to an excavator in a backhoe or the like, not only excavation work in civil engineering work but also crane work in which heavy objects such as stones are lifted and moved can be performed. Various proposals have been made to improve work efficiency. For example, in Japanese Patent Application Laid-Open No. 10-36065, a bucket is swingably connected to the tip of an arm of an excavator, and the bucket and a bucket cylinder that swings the bucket are connected via a pair of left and right links. A crane assembly (a crane device) is pivotably connected to this link.

The crane assembly has one end pivotally connected to the link and the other end provided with a hook, between which a plurality of connecting members and rods are pivotally connected in the longitudinal direction so as to be foldable. . When the crane is not used, the crane assembly is swung while being folded, so that the crane assembly can be stored between the pair of links, so that the bucket does not hinder the excavation work.

[0004]

In the above-described prior art, the stored state of the crane assembly is maintained by fixing pins provided in the left-right direction with respect to the pair of links. That is, the crane assembly is folded and stored between a pair of links, and a fixing pin is inserted in a lateral direction from a side surface of one of the links, and the fixing pin is fixed by penetrating a rod or a hook and the other link. Had become. Also, in order to prevent the fixing pin from being removed from the pair of links, it is necessary to attach a member such as a retaining pin to the fixing pin.

Therefore, when the crane assembly is stored or taken out of the storage state, a two-stage operation of inserting and removing the fixing pin and inserting and removing the retaining pin is necessary, and the excavating operation and the crane operation are required. There is a problem that the switching is complicated and time-consuming, which lowers the work efficiency. In addition, since a fixing pin insertion hole must be formed in a plurality of members such as a link and a rod, the processing cost is increased, and the fixing pin is inserted while aligning the insertion hole and the locking groove of the hook. The operation of doing it was also very troublesome.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to improve the work efficiency by making it possible to easily perform a storing operation and a removing operation of a crane device.

[0007]

The present invention employs the following technical means to achieve the above object. That is, in the present invention, a bucket is pivotably connected to the tip of the arm, and the bucket and a bucket cylinder that swings the bucket are connected via a link. In an excavating device which is swingably connected to the link and is configured to be retractable on the link side by swinging the crane device, the link includes a holding pin which can be inserted into a hook of the crane device,
The axial direction of the holding pin is set substantially along the swinging direction of the crane device, and the hook is provided with a direction through which the holding pin can be inserted when the crane device is swung in the storage direction. It is characterized by the following.

According to this, when the crane device is retracted, the holding pin can be easily inserted into the hook by the operation of swinging to the link side. It is sufficient to attach a retaining pin or the like for preventing the above from being retained to the holding pin. Therefore, when storing and removing the crane device, it is sufficient to attach and remove retaining pins etc., which greatly simplifies the operation as compared with the conventional method, and allows quick switching between excavation work and crane work. This contributes to the improvement of work efficiency.

The hook may be fixed in a direction in which the holding pin can be inserted, or may be configured to be rotatable at least in the orientation when stored. By providing a slight relative angle between the axis direction of the crane device in the stowed state and the direction perpendicular to the axis of the holding pin, interference between the tip of the holding pin and the hook swinging in the storage direction is prevented. Is preferred. Also, by chamfering the tip of the holding pin, interference between the holding pin and the hook can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a backhoe 2 employing the excavator 1 according to the embodiment of the present invention.
The backhoe 2 is provided with a swivel body 4 so as to be horizontally rotatable on a traveling device exemplified by a pair of left and right crawler traveling bodies 3, and a driver's seat 5 and a control unit 6 are mounted on the swivel body 4. It has an excavator 1 and a counterweight 7 at the rear.

The excavator 1 includes a boom 11 having a base end pivotally connected to a swing bracket 10 attached to the front part of the turning machine body 4 so as to be able to swing left and right around a left and right axis. An arm 12 having a base end pivotally pivotable about a left-right axis with respect to a distal end of the boom 11; and an arm 12 pivotally pivotable about a left-right axis with respect to a distal end of the arm 12. And a bucket 13. The boom 11, the arm 12, and the bucket 13 are respectively composed of a boom cylinder 14 and an arm cylinder 1 each composed of a hydraulic cylinder.
5 and a swing operation by the bucket cylinder 16.

The bucket 13 has a pair of left and right brackets 20 protruding from the rear surface thereof.
2 and a first link (a link according to the present invention) to this bracket 20 via a second shaft 22.
One end of 31 is pivoted. Bucket cylinder 16
The base end of the main body 16a is pivotally connected to the base end of the arm 12 via a third shaft 23, and the distal end of the rod 16b is connected to the first end.
A fourth end is connected to one end of the second link 32 together with the other end of the link 31.
The other end of the second link 32 is pivotally connected to the distal end side of the arm 12 via a fifth shaft 25.

Therefore, when the bucket cylinder 16 expands and contracts, the bucket 13 swings back and forth via the first and second links 31 and 32, and performs a scooping operation and a dumping operation. As shown in FIG. 2, the first and second links 3
A pair of first links 31 is provided on the other end of the pair of first links 31 so as to sandwich the boss 30 provided at the tip of the rod 16b of the bucket cylinder 16 from the left and right outer sides. 31a, 31a are provided, and bosses 32a, 32a provided at one end of a pair of second links 32, 32 are provided so as to sandwich the bosses 31a, 31a from the left and right outer sides, and a fourth shaft is provided for each of these bosses. 24 are penetrated.

On the other hand, between bosses 31b, 31b provided at one end of the pair of first links 31, 31, a base end boss 41a of a crane device 40, which will be described later, is disposed. Bosses 20b, 20b of the bracket 20 are arranged on the left and right outer sides of the bosses 31b, 31b, and the second shaft 22 passes through each of the bosses. As shown in FIG. 1, the crane device 40 has the boss 41 at the base end.
a, a second member 42 pivotally connected to a distal end of the first member 41 via a sixth shaft 26 that is orthogonal to the second shaft 22, And a hook 43 attached to the reference numeral 42.

The hook 43 has a main body 43a curved in a substantially U-shape, and a closing member 43b for opening and closing the opening 43d of the main body 43a. Further, the hook 43 has the opening portion 43d of the main body portion 43a facing left and right or the opening direction (through direction) of the locking hole 43c substantially coincides with the axial direction of the sixth shaft 26. Thus, they are arranged sideways. Note that the hook 43 may be fixed to the second member 42 in a horizontal state, or the hook 43 of the crane device 40 may be fixed to the second member 42 so that the hook 43 can be horizontal at least during storage, which will be described later. It may be provided rotatably around the axis Y.

The first links 31, 31 are connected to each other by first and second connecting members 34, 35 disposed between them.
A columnar holding pin 36 is provided upright. Then, the crane device 40 is swung around the second shaft 22 so as to be stored between the first links 31, 31 (in a solid line state in FIGS. 1 and 2), and is taken out from the first links 31, 31. It is provided so that the posture can be freely changed to the working state (the state shown by the two-dot chain line in FIG. 1), and when stored, the posture is held by the holding pin 36.

Specifically, the holding pin 36 has an axis X in a direction substantially along the swinging direction of the crane device 40 indicated by an arrow A in FIG. When swinging to the side, the holding pin 36 is naturally inserted into the hook 43. And hook 4
After the retaining pin 36 is inserted into the retaining pin 3, the retaining pin 38 is inserted into the tip of the retaining pin 36, and the hook 43 is sandwiched between the retaining pin 38 and the second connecting member 35, and the position in the vertical direction In addition to the regulation, the position of the hook 43 in the left-right direction is regulated by the holding pin 36.

Conversely, in order to change the posture from the stored state to the working state, the retaining pin 38 is removed from the holding pin 36,
What is necessary is just to swing the crane device 40 around the second shaft 22. Therefore, when storing and removing the crane device 40, the storing operation and the removing operation are greatly simplified as compared with the related art in which not only the retaining pin but also the retaining pin (fixing pin) is inserted and removed from the link. This makes it possible to quickly switch between excavation work and crane work,
Work efficiency can be greatly improved.

The crane device 40 may be capable of freely swinging around the second shaft 22 when in the working state. However, in order to avoid interference with the bucket 13, the two-dot chain line in FIG. The rotation to the bucket 13 side from the state described above may be restricted by a stopper or the like. Retaining pin 38
A ring-shaped pulling tool 39 made of a spring material is provided at one end of the pulling tool 39. When the pulling tool 39 is tilted toward the holding pin 36 and engages with the tip of the holding pin 36, the pulling tool 39 itself is removed. The engagement state is maintained by the elastic force, and the retaining pin 38 is prevented from being removed from the holding pin 36.

As shown in FIG. 3A, the holding pins 3
6 is chamfered by taper or radius on the outer periphery of the tip.
7 is given. In addition, the axis direction X of the holding pin 36
May be set so as to strictly follow the swinging direction of the crane device 40 (to coincide with the tangential direction of the swinging trajectory), but in the present embodiment, it is assumed that it is slightly inclined as follows. Has become. That is, a relative angle α1 is provided slightly between the axial direction Y of the crane device 40 in the retracted state and the direction X ′ orthogonal to the axis X of the holding pin 36. The chamfer 37 at the tip of the holding pin 36 constitutes interference prevention means for preventing interference between the periphery of the locking hole 43c of the hook 43 swinging in the storage direction and the tip of the holding pin 36.

The interference between the holding pin 36 and the hook 43 can also be prevented by chamfering only one end of the holding pin 36 as shown in FIG. Is a holding pin 3 as shown in FIG.
6 can be prevented by setting the relative angle α2 slightly larger without chamfering. FIG.
In the case of (c), since the chamfering process for the holding pin 36 is not required, the cost can be reduced. The present invention is not limited to the above-described embodiment, and can be appropriately changed in design.

For example, in the above embodiment, as the backhoe employing the excavator of the present invention, a swing fulcrum of the excavator is provided at the front of the turning machine 4, and the turning locus of the rear end of the turning machine 4 is A type that fits within the front, rear, left and right widths (small rear turning type) is illustrated, but a so-called standard type in which the turning locus protrudes from the traveling device 3 or a rocking fulcrum of the excavating device is provided on the driver's seat side. Also, a so-called ultra-small turning type may be used. Further, the detailed shape of the crane device is not limited to the above embodiment, and may be configured as an articulated type by three or more intermediate members, or may be a structure having no bending joint in a longitudinal middle part. .

[0023]

As described above in detail, according to the present invention, the operation of storing and taking out the crane device can be easily performed, the switching between the excavation operation and the crane operation can be speeded up, and the operation efficiency can be improved. Become.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an excavator according to an embodiment of the present invention.

FIG. 2 is a view taken along the line BB of FIG. 1;

FIG. 3 is an enlarged side view of a holding pin.

FIG. 4 is a side view of a backhoe employing the excavator according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 12 Arm 13 Bucket 16 Bucket cylinder 31 First link 36 Holding pin 40 Crane device 43 Hook

Claims (3)

[Claims] A bucket (1) is provided at the tip of an arm (12).
3) is swingably connected to the bucket (13) and the bucket cylinder (1) that swings the bucket (13).
6) via a link (31), and a crane device (40) is pivotably connected to the link (31), and the link (31) is pivoted by swinging the crane device (40). The excavating device is configured to be retractable to the side of the crane device (40), and the link (31) is provided with a holding pin (36) that can be inserted into a hook (43) of the crane device (40). Is set substantially along the swing direction (A) of the crane device (40), and when the hook (43) is swung in the storage direction of the crane device (40), An excavator equipped with a crane device, wherein the excavator is provided with a direction in which the holding pin (36) can be inserted. 2. An axial direction (Y) of the crane device (40) in a stowed state so as to prevent interference between a tip of the holding pin (36) and the hook (43) rocked in a stowed direction. 2. The crane apparatus according to claim 1, wherein the holding pin has a relative angle (α1, α2) with a direction (X ′) perpendicular to the axis (X) of the holding pin (36). Drilling rig equipped with 3. A chamfer (37) is applied to the tip of the holding pin (36) so as to prevent interference between the tip of the holding pin (36) and the hook (43) swinging in the storage direction. An excavator equipped with the crane device according to claim 1.