JP2000086162A - Crane boom extension body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boom extension body capable of rising and falling by a rising/falling cylinder without protruding the rising/falling cylinder outward. SOLUTION: A boom extension body 3 to compensate length of a boom composing a crane is provided with a long main body part 20 to supplement length of the boom, a bracket having connection parts 55, 56 to be connected to the boom and rotatably installed on a base end part of the main body part 20, a rising/falling cylinder 22 stretched between the bracket 21 and the main body part 20 to let the main body part 20 rise and fall, and a support means comprising a rod connection part 40 provided in the main body part 20 to which a rod part 22a of the rising/falling cylinder 22 is rotatably connected, and a connection part 53 provided in the bracket 21 to which a base end part of the rising/falling cylinder 22 is rotatably connected for supporting the rising/ falling cylinder 22 while constantly retracting it inside the main body part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom extension for compensating for a length of a boom constituting a crane, and more particularly to a boom extension having an up-and-down function with respect to the boom.

[0002]

2. Description of the Related Art Generally, a crane has a telescopic boom. For example, as shown in FIG. 6A, in a crane truck in which a revolving body 101 is rotatably mounted on a vehicle body 100, a boom 102 is attached to the revolving body 101 so as to be able to undulate and extend. Cylinder (not shown)
It is made to expand and contract by.

In order to compensate for the length of the boom 102, a boom extension 105 such as a jib or an auxiliary boom (hereinafter, a boom extension such as a jib or an auxiliary boom is referred to as a boom extension). Is attached to the tip of the boom 102. In this case, as shown in FIG. 6A, the boom extension 105 is attached so as to protrude forward from the tip of the boom 102, and if necessary, the boom 102 and the boom extension 105 are connected to each other. It is raised and lowered with respect to the boom 102 by a raising and lowering cylinder 104 interposed therebetween.

When the boom extension 105 is not used, it is stored, for example, on the side of the boom 102 as shown in FIG. In this case, for example, the boom extension 105 is stored along the longitudinal direction of the boom 102 with its base end directed toward the distal end of the boom 102 and its distal end directed toward the proximal end of the boom 102. You.

[0005] When the large boom extension used in the large crane is not used, it is detached from the boom 102 without being stored on the side of the boom, and is separately conveyed together with the up-and-down cylinder 104 by a trailer.

[0006]

The boom 10
Conventionally, the up-and-down cylinder 104 that raises and lowers the boom extension 105 with respect to the boom 102 and the boom extension 105 is located above or below the boom 102 and the boom extension 105.
5 (see FIG. 6A).
Specifically, the tip of the rod of the up / down cylinder 104 is rotatably attached to a bracket protruding from the boom extension 105, and the base end of the up / down cylinder 104 is rotatably attached to the boom 102 side.

As described above, the up-and-down cylinder 104 is connected to the boom 1
If the boom extension 105 is stored on the side of the boom 102 as shown in FIG. 6B, if the boom extension 105 is provided so as to protrude outside the boom extension 105, The protruding undulating cylinder 104 may be damaged by interference with an obstacle or a suspended load during traveling or crane operation. Therefore, the undulating cylinder 104
A guard must be provided separately to prevent interference with the load.

[0008] Also, the boom extension 10
When the boom extension 105 is transported separately, there is a possibility that the up-and-down cylinder 104 protruding from the boom extension 105 may be damaged when loading or transporting the boom extension 105 to the trailer. Further, since the sitting condition of the boom extension 105 on the bed of the trailer is deteriorated due to the protruding undulating cylinder 104, the boom extension 105
There is another problem that a pedestal must be provided separately. Also, when the boom extension 105 is lowered on the ground in the field in order to attach the boom extension 105 to the tip of the boom 102, there is a possibility that the undulating cylinder 104 may be damaged on a road surface with severe unevenness. These issues are
This is particularly serious when the cross-sectional area of the boom 102 increases and the amount of protrusion of the undulating cylinder 104 increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a boom extension body which can be raised and lowered by a lifting cylinder without projecting the lifting cylinder outward. .

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a boom extension for supplementing the length of a boom constituting a crane. And a bracket having a connecting portion connected to the boom, the bracket being rotatably attached to the base end of the main body, and an up / down cylinder mounted between the bracket and the main body for raising and lowering the main body. A rod connecting portion provided in the main body and rotatably connected to the rod portion of the up / down cylinder, and a connecting portion provided to the bracket and rotatably connected to the base end portion of the up / down cylinder. And a support means for supporting the undulating cylinder while always retracting it inside the main body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 5 shows a crane truck 1 provided with a telescopic boom 2 to which the boom extension according to the present embodiment is attached. As illustrated, the crane truck 1 includes a carrier 10 as a traveling vehicle body, and a revolving unit 16 including a cab 14 and a telescopic boom 2 is rotatably mounted on the carrier 10. in this case,
The telescopic boom 2 is formed by connecting a plurality of stages of booms so as to be extendable and contractible, is extendable by a telescopic cylinder (not shown), and extends and retracts between the rotating body 16 and the lower surface of the base end boom 2a. The undulating operation 19 is performed.

The revolving unit 16 is provided with a winch (not shown), and the wire 11 is wound or unwound by the winch. An upper sheave 17 of a rotatable boom head 13 located at the tip of the boom 2 (the leading end boom 2b located at the tip end in the extended state) is fed out from the winch.
(See FIG. 4), then the boom head 13
Is wound around the lower sheave 18 (see FIG. 4) and the sheave of the hook block 15 having the load hanging hook, so that the load hanging hook can be hung up and down from the end of the boom 2. I can do it. In FIG. 5, in order to attach an auxiliary boom 3 (which will be described later) as a boom extension to the distal end side of the boom 2, the boom head 13 is turned upward and retracted, and the distal end of the jib 5 which will be described later. The wire 11 is multiply wound between the sheave of the hook block 15 and the sheave.

As shown in FIG. 1, an auxiliary boom (boom extension) 3 for compensating for the length of the boom 2 is provided with a front end boom 2.
b, a main body 20 having a substantially rectangular cross section and a movable bracket 21 rotatably attached to the base end of the main body 20, and a bridge between the movable bracket 21 and the main body 20. The members 20, 21, 22 are integrally attached to and detached from the boom 2 or separately conveyed by a trailer.

As shown in detail in FIG.
Is a pair of side plates and an upper plate 58 connecting these side plates.
And the bottom plate 59. Main unit 20
Are provided with a pair of brackets 30 at the base end. The brackets 30, 30 are fixed to both sides of the upper plate 58, respectively, and pins 50 (see FIGS. 1 and 2C) for connecting the movable bracket 21 to the main body 20 are inserted. It has a pin hole 31.

Further, inside the base end of the main body 20, 2
The two cylinder rod connecting portions 40 are fixedly provided on the bottom plate 59. In this case, the two cylinder rod connecting portions 40, 40 are connected to the central axis O of the longitudinal section of the main body 20.
It is arranged substantially symmetrically with respect to (see FIG. 2B) and has a pin hole 41. A pin 79 (see FIG. 1) for connecting the rod portion 22a of each undulating cylinder 22 to the connecting portion 40 is inserted into the pin hole 41.

Further, as shown in FIG.
Is provided with a connecting portion 82 to which another auxiliary boom or jib is connected. In this connecting portion 82,
Pin holes 60, 6 are located above and below the main body 20, respectively.
1 is provided. In these pin holes 60 and 61,
A connecting pin for connecting another auxiliary boom or jib to the main body 20 is inserted. Further, legs 66 and 67 are provided at the distal end and the proximal end of the main body 20, respectively. These legs 66 and 67 are projected from the lower surface of the bottom plate 59, and when the auxiliary boom 3 is grounded to the road surface R,
Raised cylinder 22 (preferably also movable bracket 21)
Is separated from the road surface R by a certain distance, and the main body 20 is stably supported.

As shown in FIG. 1, the movable bracket 2
1 has a first connecting portion 51 connected to the main body 20 at the upper edge portion on the distal end side. This first connecting portion 51
Is the pin 50 inserted in the pin hole 31 of the bracket 30.
Thus, it is rotatably supported by the main body 20. The movable bracket 21 has a second connecting portion 53 connected to the base end of the undulating cylinder 22 at the lower edge on the distal end side. The second connecting portion 53 and the undulating cylinder 22
Are rotatably connected to each other by connecting pins 84 inserted into pin holes formed in the two 53 and 22, respectively. In addition, pin holes 55 and 56 are provided at the base end of the movable bracket 21 at upper and lower positions, respectively. In these pin holes 55 and 56, the movable bracket 21 is attached to another auxiliary boom or the most advanced boom 2a.
The connecting pins 77 and 78 (see FIG. 3) for connecting to the tip of are inserted.

On the other hand, the up-and-down cylinder 22 which raises and lowers the auxiliary boom 3 has the tip of the rod portion 22a rotatably connected to the cylinder rod connecting portion 40 via the pin 79 as described above, and The end is a connecting pin 84
And is rotatably connected to the second connecting portion 53 of the movable bracket 21 via. In particular, in the present embodiment, the up-and-down cylinder 22 supported between the second connecting portion 53 and the cylinder rod connecting portion 40 does not protrude outside the main body portion 20 at the time of rocking and stationary due to rod expansion and contraction. (So that it is always located inside the auxiliary boom 3), the positions of the connecting portions 40 and 53 are set. Therefore, the up-and-down cylinder 22 is erected between the movable bracket 21 and the main body 20 in a state where the whole is retracted inside the auxiliary boom 3 and a part thereof is housed in the main body 20. The pin hole 41 of the cylinder rod connecting portion 40
Is provided at a position where the undulating cylinder 22 that swings with the expansion and contraction of the rod portion 22 a does not interfere with the bottom plate 59. Also, as shown in FIG.
2 is connected to a hydraulic pipeline 80 for supplying pressure oil thereto.

FIG. 3 shows a state in which the auxiliary boom 3 having the above configuration is attached to the tip of the foremost boom 2b. Specifically, first, the auxiliary boom 3 transported by the trailer is grounded on a road surface R in the site as shown in FIG. At this time, since the entirety of the up-and-down cylinder 22 is retracted inside the auxiliary boom 3 and a part thereof is stored in the main body portion 20, it is damaged when the auxiliary boom 3 is unloaded or transported from the trailer, It is not damaged by rough road surfaces. In particular, leg 6
The risk of damage to the up-and-down cylinder 22 is almost certainly avoided by separating the up-and-down cylinder 22 and the road surface R by a predetermined distance by the 6, 67.

Next, from the state shown in FIG. 1A, the rod portion 22a of the undulating cylinder 22 is extended by a predetermined amount, and the movable bracket 21 is rotated with respect to the main body portion 20 (FIG. 1B). ), Move the movable bracket 21 to the state-of-the-art boom 2b
Face the mounting part. Then, in this facing state, the movable bracket 21 is connected and fixed to the mounting portion of the foremost boom 2b via the connecting pins 77 and 78 (see FIG. 3).

When the rod portion 22a of the up-and-down cylinder 22 is expanded and contracted in the connected state shown in FIG. 3, the auxiliary boom 3 can be rotated with respect to the boom 2 and the angle between the boom 2 and the auxiliary boom 3 is formed. Can be changed. In the connected state shown in FIG. 3, the boom head 13 (see FIGS. 4 and 5) provided at the tip of the foremost boom 2b so that the load hanging hook can be hung up and down from the tip of the auxiliary boom 3. 5) may be provided at the connecting portion 82 at the tip of the auxiliary boom 3. In this case, the boom head provided on the connecting portion 82 may be provided with an auxiliary boom or jib as necessary.
So as to be rotatable upward with respect to the connecting portion 82 so as to be connected to the connecting portion 82.

FIGS. 4 and 5 show a state in which the auxiliary boom 3 having the above-described configuration is extended to the distal end side of the foremost boom 2b via another auxiliary boom 4. FIG. In this case, as shown in the drawing, the jib 5 is connected to the tip of the auxiliary boom 3 via the connecting portion 82.
May be attached. If you do not attach jib 5,
3, a boom head rotatable upward is provided at the connecting portion 82 at the tip of the auxiliary boom 3 so that the load hanging hook can be hung up and down freely from the tip of the auxiliary boom 3. May be.

In the connection form shown in FIGS. 4 and 5,
A position where the rod portion 22a is extended and the auxiliary boom 3 is substantially aligned with the boom 2 (a solid line position in FIG. 4, a position (a) in FIG. 5).
When the rod portion 22a is contracted from the state in which the boom 2 (the auxiliary boom 4) is extended, the auxiliary boom 3 rotates inward with respect to the boom 2 (the auxiliary boom 4), and the boom 2 (the auxiliary boom 4) and the auxiliary The angle formed by the boom 3 becomes smaller (see the dashed line in FIG. 4 and (b) in FIG. 5). As is clear from FIG. 5, the hoisting cylinder 22 is entirely retracted inside the auxiliary boom 3 and a part of the hoisting cylinder 22 is accommodated in the main body 20. There is no risk of damaging the up-and-down cylinder 22 due to the interference.

As described above, in the auxiliary boom 3 of the present embodiment, the entirety of the up-and-down cylinder 22 is retracted inside the auxiliary boom 3 and a part of the up-and-down cylinder 22 is housed in the main body 20. Therefore, there is no danger that the lifting load will interfere with the undulating cylinder 22 and damage the undulating cylinder 22 during the crane operation. Also, when loading and unloading the auxiliary boom 3 to the trailer, transporting the auxiliary boom 3, damaging the up-and-down cylinder 22, and attaching the auxiliary boom 3 to the tip of the boom 2, lowering the auxiliary boom 3 on the ground in the field, Undulating cylinder 2 on severe road surface
There is no risk of damaging 2. In particular, the legs 66, 67
As a result, the danger of damage to the up-and-down cylinder 22 can be almost certainly avoided by separating the up-and-down cylinder 22 from the road surface R by a predetermined distance. The legs 66 and 67 are connected to the main body 20.
Is stably supported, and particularly, the sitting condition of the auxiliary boom 3 with respect to the bed of the trailer is improved, and it is not necessary to separately provide a base for the auxiliary boom 3 on the trailer side. Further, since the up-and-down cylinder 22 is arranged inside the auxiliary boom 3, the cross-sectional area of the main body 20 of the auxiliary boom 3 can be made as large as possible. That is, all of the allowable height of the auxiliary boom 3 can be used for the height of the main body 20.
Therefore, application to a large crane that lifts a large load becomes easy.

In this embodiment, the undulating cylinder 22
Are provided, but the number of the undulating cylinders 22 is not limited to this. The number may be one, or three or more. It may be determined according to the type of crane to be applied. Further, in this embodiment, the auxiliary boom 3 has been described as an example of the boom extension, but the boom extension that assists the length of the boom 2 is not limited to the auxiliary boom 3 and may be a jib. That is, the jib 5 shown in FIGS. 4 and 5 may include the up-and-down cylinder 22 and the movable bracket 21 similarly to the auxiliary boom 3, and the up-and-down cylinder 22 may be arranged inside the jib 5. Further, in the present embodiment, the form in which the auxiliary boom 3 is separately conveyed by the trailer has been described. However, as shown in FIG. 6B, the auxiliary boom 3 is stored on the side of the boom 2. May be. Even in this case, since the up-and-down cylinder 22 does not protrude outward from the auxiliary boom 3, there is no possibility that the up-and-down cylinder 22 will be damaged by interference with an obstacle or a suspended load during traveling or crane operation.

[0026]

As described above, according to the boom extension of the present invention, it is possible to raise and lower the undulating cylinder without projecting the undulating cylinder outward.

[Brief description of the drawings]

FIG. 1 is a side view of an auxiliary boom (boom extension) according to an embodiment of the present invention.

2A is a side view of a main body part of the auxiliary boom shown in FIG. 1; FIG. 2B is a cross-sectional view taken along a line BB; FIG. 2B is a sectional view taken along a line AA in FIG. FIG. 3C is a cross-sectional view (top view) of FIG.

3A is a side view showing a state in which the auxiliary boom of FIG. 1 is attached to a tip of the boom, and FIG. 3B is a cross-sectional view taken along line DD of FIG.

FIG. 4 is a side view showing another connection form of the auxiliary boom of FIG. 1;

FIG. 5 is an overall view of a crane truck having the connection form of FIG. 4;

FIG. 6 (a) is a side view of a conventional crane vehicle provided with a boom extension, and FIG. 6 (b) is a diagram showing a state in which the boom extension is stored on a side of the boom in the crane truck of FIG.

[Explanation of symbols]

 2 boom 3 auxiliary boom (extended boom) 20 body part 21 movable bracket (bracket) 22 undulating cylinder 40 cylinder connection part (support means) 53 connection part (support means)

Claims (1)

[Claims] 1. A boom extension for compensating a length of a boom constituting a crane, comprising: a long main body portion for assisting the boom length; and a connecting portion connected to the boom. A bracket rotatably attached to the base end portion, an up / down cylinder erected between the bracket and the main body portion for raising / lowering the main body portion, and a rod portion of the up / down cylinder provided in the main body portion and rotating And a connecting portion provided on the bracket and rotatably connected to the base end of the up-and-down cylinder so that the up-and-down cylinder is always retracted inside the main body and supported. Means, comprising: a crane boom extension.