JP2001302181A - Jib extension and storage device of mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jib extension and storage device of a mobile crane capable of preventing the rotating cylinder of a jib rotating means from interfering with a load lifting wire rope and from colliding with a building in the jib extension and storage device of the mobile crane. SOLUTION: A jib rotating means comprises a first link having one end pivotally attached to a jib support base end part thereof, a second link having one end pivotally attached to the other end of the first link and the other end allowed to be pivotally attachable to and detachable from the storage side- surface of an auxiliary jib at the tip of a telescoping boom, and a rotating cylinder having one end pivotally attached to an appropriate position of a jib support and the other end pivotally attached to the first link or second link. The rotating cylinder is disposed overlappingly to the jib support in side view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working posture in which a front end of a telescopic boom is attached to the front side of the telescopic boom in a state of extending forward, and a base end of the telescopic boom is located at a front end side of the boom. The present invention relates to an overhang storage device of an auxiliary jib of a mobile crane which is overhanged and stored in a storage posture held and held in a horizontal holding state.

[0002]

2. Description of the Related Art In a crane with an auxiliary jib, the auxiliary jib is folded and stored along one side surface of the telescopic boom when not in use, and is used by projecting from the folded position to the front of the distal end of the telescopic boom when in use. . When extending the auxiliary jib from the folding position along the side of the telescopic boom to the front overhanging position, or from the front overhanging position to the folding position, one side of the auxiliary jib base end and the telescopic boom tip This is performed by rotating the auxiliary jib by an angle of about 180 degrees with respect to the telescopic boom in a state in which one side of the section is connected to a connecting shaft.

In such a movable crane with an auxiliary jib, a jib rotating device for extending or folding the auxiliary jib has been conventionally known as shown in FIG.
No. 81) is known.

In the known jib rotating device shown in FIG. 5, one side of a base end of a jib support 31 of an auxiliary jib 3 is pivotally supported by a connecting shaft 10 on one side of a distal end 13b of a telescopic boom 2. And
Further, one end 4a of a turning cylinder 4 for turning an auxiliary jib is pivotally mounted on the upper surface of one end of the jib support 31.
One end of each of the two links 5, 6 is pivotally connected to the other end 4b of the rotary cylinder 4. The other end of one of the links 5 is pivotally connected to the upper surface of the base end of the jib support 31, and the other end of the other link 6 is pivotally connected to the distal end 13b of the telescopic boom 2. I have.

The known jib rotating device shown in FIG. 5 has a folding position where the auxiliary jib 3 is folded along one side surface of the telescopic boom 2 by the expansion and contraction of the rotary cylinder 4 according to the above configuration. Tip 13b of telescopic boom 2
Approximately 180 degrees from the overhang position where it overhangs from the front
It can rotate within the range of degrees.

[0006]

However, a wire for hanging loads is located above the above-mentioned rotary cylinder 4;
Depending on the posture of the auxiliary jib 3 or the state of the lifting wire, there is a possibility that the rotating cylinder and the lifting wire may interfere with each other.

In the prior art, the turning cylinder is arranged on the upper surface of the jib support. Conversely, when the turning cylinder is arranged on the lower surface of the jib support, the turning cylinder projects downward from the jib support. To be in a state,
The operation of the telescopic boom may cause the rotation cylinder to collide with a building or the like.

Accordingly, the present invention is to provide a jib overhanging and retracting device for a mobile crane in which the rotating cylinder of the jib rotating device does not interfere with the lifting wire or collide with a building or the like. Is what you do.

[0009]

According to a first aspect of the present invention, there is provided a jib support which is mounted on a distal end of a telescopic boom provided on a vehicle so as to be capable of raising and lowering, and is pivotally mounted on the distal end of the jib support so as to be able to raise and lower. An auxiliary jib comprising a main jib body, a jib connecting means for detachably connecting a jib support base end of the auxiliary jib and a distal end of the telescopic boom with a pair of right and left vertical support shafts, and one of the connecting means. Disconnecting the side, and rotating the auxiliary jib about the support shaft connected to the other side, disposed between the jib support base end and the telescopic boom tip, the distal end of the telescopic boom of the auxiliary jib The front and rear sides of the telescopic boom are rotated to a working posture and a retracted posture in which the base end of the telescopic boom is stored and held in a horizontal holding state with the base end directed toward the boom tip. Jib rotating hand to perform movement Wherein the jib rotating means comprises a first link having one end pivotally connected to the jib support base end, and a second link having the other end connected to the other end of the first link. A second link having one end pivotally connected and the other end releasably pivotable to the auxiliary jib storage side surface at the end of the telescopic boom; one end pivotally connected to a suitable jib support, and the other end connected to the first link; Alternatively, a rotary cylinder pivotally attached to the second link is provided, and the rotary cylinder is disposed on the jib support so as to overlap with the side view.

[0010] With this configuration, the rotation cylinder that constitutes the jib rotation device that performs the extension or folding operation of the auxiliary jib is located inside the jib support, and the jib support guards the rotation cylinder. This eliminates the risk of the cylinder interfering with the lifting wire or colliding with a building or the like.

[0011]

FIG. 1 shows a jib overhang storage device of a mobile crane according to an embodiment of the present invention. Reference numeral 24 denotes an auxiliary jib, which is a jib support 22 mounted on a distal end portion 21 of a telescopic boom 20 provided on a vehicle (not shown) so as to be able to raise and lower, and a jib body 23 mounted on the jib support distal end portion 25 so as to be able to raise and lower. It is composed of In this embodiment, the jib support 22 has a box structure in which plate members are combined and welded.

Reference numeral 26 denotes jib connecting means for detachably connecting the jib support base 27 of the auxiliary jib 24 and the telescopic boom tip 21 with a pair of vertical left and right support shafts.

Reference numeral 28 denotes a jib rotating means for releasing the connection of one side of the connecting means 26 and rotating the auxiliary jib 24 about a support shaft connected to the other side. It is located between the base end 27 and the telescopic boom tip 21. The auxiliary jib 24 is provided at the tip 2 of the telescopic boom.
1 is a work posture mounted on the front side of the telescopic boom 20 in a state of extending forward, and a storage posture stored and held on the side of the telescopic boom 20 in a state of holding the base end 27 sideways toward the boom distal end 21. The rotation operation is performed at the same time. FIG.
5 shows a state in which the auxiliary jib 24 is stored and held in a lateral holding state with the base end portion 27 facing the boom tip end portion 21 side of the telescopic boom 20.

The jib rotating means 28 includes a first link 29 having one end pivotally connected to the jib support base end 27.
A second link 41, one end of which is pivotally connected to the other end of the first link 29 and the other end of which can be pivotally released from the auxiliary jib storage side surface 40 of the telescopic boom tip 21; A pivot cylinder 43 pivotally attached to the pivot cylinder mounting portion 42 of the support and the other end pivotally attached to the first link 29. As shown, the rotary cylinder 43 is arranged so that substantially the entirety thereof is located inside the jib support 22.

FIG. 2 is a view taken in the direction of the arrow A in FIG. 1, and shows a state where the jib overhanging storage device is viewed from the side. The rotary cylinder 43 is disposed so as to be entirely overlapped with the upper part of the jib support 22 in a side view, and is located below the upper plate 57 constituting the jib support 22. Since the cylinder-side end 56 of the rotary cylinder 43 is pivotally mounted close to the side plate 58 constituting the jib support 22, the strength of the cylinder fulcrum is sufficiently ensured.

The jib connecting means 26 has an upper connecting pin 44 and a lower connecting pin 45 constituting a pair of right and left vertical support shafts, and a drive cylinder 46 interposed therebetween.
With the drive cylinder 46 contracted, the distal end of the upper connecting pin 44 is inserted into the upper jib support boss 48 above the jib support base end 27, and the distal end of the lower connecting pin 45 is connected to the jib support base. It is inserted into a jib support lower boss 49 below the end 27. Drive cylinder 46
Is extended, the distal end of the upper connecting pin 44 is inserted into the upper boss 50 of the telescopic boom distal end 21, and the distal end of the lower connecting pin 45 is inserted into the lower boss 51 of the telescopic boom distal end 21. It is supposed to be.

The mounting height of the rotary cylinder 43 is the same as that of the jib support upper boss 48 described above. Thus, even when the auxiliary jib is rotated by the expansion and contraction force of the rotation cylinder 43, no torsional moment acts on the jib support 22, which is advantageous in strength.

The extension operation from the storage position of the auxiliary jib 24 shown in FIG. 1 to the working posture in which the auxiliary jib 24 is mounted on the front side of the distal end portion 21 of the telescopic boom so as to extend forward thereof is as follows. It is on the street.

When the bosses 50 and 51 on the auxiliary jib storage side of the distal end portion 21 of the telescopic boom and the bosses 48 and 49 on the telescopic boom side of the base end portion 27 of the jib support are concentric, the drive cylinder of the jib connecting means 26 is moved. When the extension 46 is extended, the upper and lower connection pins 44 and 45 are simultaneously inserted into the auxiliary jib and the boss of the telescopic boom, so that one side of the telescopic boom distal end 21 and one side of the jib support base end 27 are connected, and the connecting pin 4
It is possible to rotate the auxiliary jib 24 about the positions 4 and 45.

At this time, the pin 53 of the telescopic boom tip side end 52 of the second link 41 constituting the jib turning means 28 is connected to the auxiliary jib storage side surface 40 of the telescopic boom tip by a connecting device (not shown). Pivoted through.

When the rotary cylinder 43 is extended in the above state, the extension force is transmitted to the telescopic boom tip 21 via the first link 29 and the second link 41, and the reaction force causes the extension jib 24 as a whole. Are the connecting pins 44 and 45
Will rotate around the center.

FIG. 3 shows the jib connecting means 26 on the opposite side of the pivot point after the auxiliary jib 24 has been turned approximately 180 degrees.
And the auxiliary jib 24 is extended forward on the front side of the distal end portion 21 of the telescopic boom.

FIG. 4 shows the auxiliary jib 24 in a working position.
FIG. The rotary cylinder 43 is used for the jib support 22.
, It cannot be seen in this figure. Numeral 72 is a wire rope for lifting cargo fed out from a winch of a swivel (not shown), and is provided with a roller 73 at the upper end of the jib support, a sheave 74 at the tip of the jib support, and a sheave 75 at the tip of the jib body 23. It is suspended from the tip of the main body.

As described above, the wire rope 72 for hanging load runs on the upper part of the jib support 22,
Is disposed inside the jib support 22 and is guarded by a plate material constituting the jib support, so that there is no possibility of interference with the wire rope 72 for hanging load.

[0025]

(1) The rotating cylinder constituting the jib rotating device for performing the extension or folding operation of the auxiliary jib is located inside the jib support, and the jib support guards the rotating cylinder. There is no danger that the dynamic cylinder will interfere with the lifting wire or collide with a building or the like. (2) When the jib support has a box structure, the portion of the rotary cylinder disposed therein that is directly exposed to the wind and rain is reduced, which is advantageous for rust prevention. (3) Since the rotary cylinder is located inside the jib support, the fulcrum of the rotary cylinder can be configured close to the member forming the jib support, and the strength of the rotary cylinder fulcrum can be easily secured. . (4) The cross section of the jib support can be made larger than that in which the rotary cylinder is arranged above or below the jib support, which is advantageous in terms of the strength of the entire jib support.

[Brief description of the drawings]

FIG. 1 is a jib overhang storage device according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a view showing a state where an auxiliary jib is extended to a front surface of a telescopic boom.

FIG. 4 is a side view of the auxiliary jib in a working posture.

FIG. 5 is a conventional jib overhanging storage device.

[Explanation of symbols]

20 Telescopic boom, 21 Telescopic boom tip, 22 jib support, 23 jib body, 24 auxiliary jib, 25
Jib support distal end, 26 Jib connecting means, 27 Jib support proximal end, 28 Jib rotation means, 29 First link, 40 Telescopic boom tip end auxiliary jib storage side, 41
2nd link, 42 rotating cylinder mounting part, 43 rotating cylinder, 44 upper connecting pin, 45 lower connecting pin,
46 drive cylinder, 48 jib support upper boss, 4
9 Jib support lower boss, 50 telescopic boom tip upper boss, 51 telescopic boom tip lower boss, 52 second link telescopic boom tip end, 53 connecting pin, 56 cylinder end, 57 jib support upper plate, 58 Jib support side plate, 72 Wire rope for hanging load, 73 Roller at the rear end upper part of Jib support, 74 75 Sheave

Claims (1)

[Claims] 1. An auxiliary jib comprising: a jib support mounted on a distal end of a telescopic boom movably provided on a vehicle; and a jib body pivotally mounted on the distal end of the jib support, and the auxiliary jib. Jib connecting means for detachably connecting the jib support base end and the telescopic boom tip with a pair of vertical left and right support shafts; and a support for releasing the connection on one side of the connection means and connecting the other side. To rotate the auxiliary jib about a shaft, the auxiliary jib is disposed between the base end of the jib support and the distal end of the telescopic boom, and is attached to the front side of the distal end of the telescopic boom of the auxiliary jib so as to extend forward. And a jib rotating means for rotating the telescopic boom to a retracted posture in which the base end of the telescopic boom is stored and held in a lateral holding state with the base end thereof facing the boom distal end. Crane jib overhang In the storage device, the jib rotating means may include a first link having one end pivotally attached to the base end of the jib support, and one end pivotally attached to the other end of the first link, and the other end having the telescopic boom. A second link that can be pivotally released from the side of the auxiliary jib storage side at the tip, and a pivot that has one end pivotally attached to a proper position of the jib support and the other end pivotally attached to the first link or the second link; An auxiliary jib overhanging and retracting device for a mobile crane, wherein the rotary cylinder is disposed so as to overlap the jib support in a side view.