JPH0840691A - Jib housing device of crane - Google Patents

Abstract

PURPOSE:To house a jib in a boom without causing interference with a boom extension/contraction means and irrespective of a boom step number. CONSTITUTION:A jib housing space S is formed between the bottom slab outer surface of a second step boom 2 and the bottom slab inner surface of a base boom 1 constituting an extendable/contractable boom B, and a jib J is housed in the jib housing space S in the state of being put on a boom extension/ contraction cylinder C for the second step boom 2, and is held in a housing state by means of a jib housing retention pin 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib retracting device for retracting a jib extended at the tip of a boom in a crane equipped with a box type telescopic boom when the boom is not in use.

[0002]

2. Description of the Related Art Conventionally, as a means for storing a jib with respect to a boom, as shown in Japanese Utility Model Laid-Open No. 58-92289, a means for storing the jib in a second stage boom of the boom is known. .

[0003]

However, according to this known technique, since the jib is stored in the second stage boom while avoiding the interference with the boom telescopic cylinder, there is still room in the space in the boom. A boom having a simple structure, that is, a boom up to a three-stage type having only one boom telescopic cylinder as a boom telescopic means and one set of boom telescopic mechanisms combining a sheave and a rope can be applied. However, in the case of a 4-stage or higher multi-tiered boom with 3 or more sets of boom telescopic means, which is often used in reality, there is not enough space in the boom and interference with the boom telescopic means occurs. , Could not be applied.

Therefore, the present invention, regardless of the number of boom stages,
A jib storage device for a crane capable of storing a jib in a boom without interfering with boom expansion / contraction means.

[0005]

The invention according to claim 1 comprises a boom configured to extend and contract by a basic boom and one or more movable booms, and a jib extended at the tip of the boom. In this crane, a jib head provided with a sheave through which an auxiliary winding rope is passed is provided at the tip, and the jib is provided between the inner surface of the bottom plate of the basic boom and the outer surface of the bottom plate of the second stage boom. A jib storage space for storing a jib storage space that can be stored in and out of the basic boom in the length direction of the jib when not in use, and is provided with a jib storage holding means for holding the jib in the jib storage space. is there.

According to a second aspect of the present invention, in the structure according to the first aspect, a boom telescopic cylinder for extending and retracting the second stage boom relative to the basic boom is provided. Place the jib with the side ends attached to the second stage boom,
It is formed in a tubular shape that can be fitted onto the boom telescopic cylinder in the jib storage space.

According to a third aspect of the present invention, in the structure according to the first or second aspect, an auxiliary sheave including an auxiliary sheave through which the auxiliary winding rope is passed and a sheave bracket that rotatably supports the auxiliary sheave is provided at the boom tip. The unit is detachably attached, and the auxiliary sheave bracket of the unit is provided with a common attachment portion detachably attached to the boom tip and the jib tip so that the auxiliary sheave unit also serves as the jib head.

According to a fourth aspect of the present invention, in the structure of the third aspect, a jib foot pin hole is formed at the base end of the jib to be pin-connected to the boom tip in a state where the jib is extended, while an auxiliary sheave unit is pin-connected. A pin hole at the tip of the boom is provided on the jib axis passing through the jib foot pin hole in the jib retracted state.

[0009]

According to the above construction, since the jib is stored in the jib storage space formed between the inner surface of the bottom plate of the basic boom and the outer surface of the bottom plate of the second stage boom, the jib does not interfere with the boom expanding / contracting means. . Therefore, the jib can be stored in the boom regardless of the number of boom stages.

Further, as compared with the case where the jib is stored in the second stage boom, since the storage position is lower, the storage and extension operations can be performed easily and safely.

On the other hand, according to the second aspect of the present invention, the jib storage space can be shared by the boom telescopic cylinder for extending and retracting the second stage boom with respect to the basic boom while avoiding interference with the jib. As compared with the case where the same cylinder is provided in the second stage boom, there is more space in the second stage boom, and the boom telescopic means for the other stage boom can be easily installed.

According to the third aspect of the invention, the auxiliary sheave unit used only during normal work without a jib can be used as the jib head during jib work with the jib. The weight of the boom tip at the time of jib work can be reduced compared to the case where jib work is performed with the boom tip attached, and the lifting capacity can be increased accordingly.

Further, when the jib is stored, the jib head is replaced as an auxiliary sheave unit with the tip of the boom, so that the jib head does not interfere with the jib storage.

Further, according to the structure of claim 4, when the jib is pulled out from the jib storage space when the jib is extended, the jib foot pin hole is automatically aligned with the auxiliary sheave unit mounting pin hole at the tip of the boom. Becomes easier,
Jib overhang operation becomes easy. Moreover, the pin hole for mounting the auxiliary sheave unit can also be used as the pin hole for mounting the jib when the jib is extended, so the structure is simple.

[0015]

1 to 4 show a jib stored state and FIG. 6 shows a jib extended state.

The boom B is constructed as a four-stage boom consisting of a basic boom 1, second and third stage booms 2 and 3, and a tip boom 4 so as to be extendable and retractable.

In this boom B, an idler and a main sheave 5, 6 are provided at the tip (boom head) 4a of the tip boom 4, and a main winding rope 7 pulled out from a winch (not shown) passes through the idler sheave 5. And is hooked around the main sheave 6 and the hook sheave 9 of the main hook 8.

Further, an auxiliary sheave unit 12 including an auxiliary sheave 10 and a sheave bracket 11 for rotatably supporting the sheave 10 is provided on the front side of the boom head 4a, and during normal work without using the jib J, The auxiliary winding rope 13 is passed through the idler sheave 5 and the auxiliary sheave 10, and the auxiliary hook 14 is attached to the end thereof.

The sheave bracket 11 of the auxiliary sheave unit 12 has a cylindrical common mounting portion on the base end side (see FIG. 5).
The auxiliary sheave unit 12 is detachably attached to the boom head 4a by having the common attachment portion 11a fitted into the boom head 4a and being pin-connected during normal work.

In FIGS. 1 and 5, 15 is a pin hole provided in the common mounting portion 11a, 16 is a pin hole of the boom head 4a, and 1 is a pin hole.
Reference numeral 7 is a connecting pin.

When the jib is extended, the unit 12 is removed from the boom head 4a and attached to the tip of the jib as a jib head as shown in FIGS.

That is, the jib J is formed in a rectangular tube shape,
The common mounting portion 11a of the auxiliary sheave unit 12 serving as a jib head is fitted into the tip portion of the jib J and is connected to each other by the pin holes 15 and 18 and the pin 17.

Further, a jib foot pin hole 21 is provided at the base end of the jib J, and when the jib is extended, the jib foot pin hole 21 is a pin hole for mounting the auxiliary sheave unit of the boom head 4a (hereinafter referred to as a common pin hole). It is attached to 16 by a jib storage holding pin 31.

Further, a jib supporting member 22 and a jib supporting roller (see FIG. 6) 23 are provided in the boom head 4a, and the base end portion of the jib J and the jib supporting member 22 are provided with the jib supporting member 22 (see FIG. 6). It is supported by the support roller 23.

When not in use, the jib J is stored in the boom B with the auxiliary sheave unit (jib head) 12 removed from the tip.

The boom B is constructed as follows to store the jib J.

A jib storage space S is formed between the inner surface of the bottom plate of the basic boom 1 and the outer surface of the bottom plate of the second stage boom 2, and the second stage boom 2 is located in the jib storage space S with respect to the basic boom 1. A boom hoisting cylinder C for expanding and contracting is provided, and the jib J is stored when not in use.

The jib storage space S is formed by providing pads (shown in FIG. 2) 24 between the boom 1 and the second stage boom 2 at the base end and the tip of the basic boom 1. ing.

In FIG. 2.3, reference numerals 25, ... Represent other pads provided between the booms 1 and 2.

2 to 4, for simplification of the drawings, illustration of the third stage and front end booms 3 and 4, the boom expanding and contracting means, and the pads between them is omitted.

In the boom hoisting cylinder C, as shown in FIGS. 1 and 3, the rod end is the base end of the basic boom 1 and the rod side end of the cylinder tube C1 is the base end of the second stage boom 2. It is attached by pins 26 and 27.
Further, in FIG. 1, 28 is a cylinder supporting roller provided at the head side end of the cylinder tube C1.

The jib J is inserted into the jib storage space S from the tip side of the basic boom 1 in the length direction of the jib, and is fitted onto the cylinder tube C1 of the boom hoisting cylinder C as shown in FIGS. Stored as state.

As a means for holding the jib J in the jib storage space S, a pin hole is formed on the lower surface of the tip portion of the second stage boom 2 (the lower surface when the boom is lying down) as shown in FIGS. A bracket 30 having a bracket 29 is provided, and the jib storage holding pin 3 is provided across the pin hole 19 for mounting the auxiliary sheave unit in the jib J and the pin hole 29 of the bracket 30.
By inserting 1, the jib J is held in the stored state.

Further, the bracket 30 has a pin hole 29.
A guide roller 32 is provided on the lower side, and the jib J is easily moved in and out by the rotation of the guide roller 32.

By the way, the jib J is taken in and out along the jib axis in the stored state. Here, as shown in FIG. 1, the common pin hole 16 of the boom head 4a has a jib axis L passing through the jib foot pin hole 21 of the jib J in the stored state.
The jib foot pin hole 21 is configured to coincide with the common pin hole 16 by an operation provided on the jib J and retracted from the jib storage space S.

.. in FIG. 4 are pads provided on the bracket 30 to reduce friction when the jib is taken in and out.

Next, the jib overhanging procedure will be briefly described.

The auxiliary sheave unit 12 is removed from the boom head 4a.

The jib storage holding pin 31 is pulled out, and the jib J is pulled forward from the tip side of the basic boom 1.

The jib foot pin hole 21 is replaced with the common pin hole 1
6, and the jib storage holding pin 31 is inserted into both pin holes 21 and 16.

Incidentally, it is desirable to provide a stopper for stopping the pulling out of the jib J at the position where the pin holes 21 and 16 coincide with each other on the jib J and the boom head 4a.

The common mounting portion 11 a of the auxiliary sheave unit 12 is fitted into the tip portion of the jib J and fixed with the pin 17.

As a result, the extension of the jib J is completed, and the auxiliary sheave 10 of the auxiliary sheave unit 12 is covered with the auxiliary winding rope 13
And the jib work is performed. The jib J is stored in the reverse procedure.

As described above, the jib storage space S is formed between the inner surface of the bottom plate of the basic boom 1 and the outer surface of the bottom plate of the second stage boom 2, and the jib J is stored in the jib storage space S. Since there is no interference between J and the boom expanding / contracting means, the jib J can be stored in the boom B even in the four-stage boom B shown in this embodiment or a multi-stage boom having more stages.

Moreover, as compared with the case where the jib J is stored in the second stage boom 2, since the storage position is low, the storage and extension operations can be performed easily and safely.

Further, since a boom telescopic cylinder C for extending and retracting the second stage boom is provided in the jib storage space S and the jib J is stored while being fitted onto the same cylinder C, the cylinder C is used for the second stage boom 2. Compared with the case where it is provided inside, a space can be provided in the second stage boom 2, and the boom expanding and contracting means for the third stage and fourth stage booms 3 and 4 can be easily installed.

Further, since the auxiliary sheave unit 12 used only during normal work can be diverted as a jib head during jib work, as compared with the case where jib work is performed with the auxiliary sheave unit 12 attached to the boom tip. As a result, the weight of the boom tip during jib work can be reduced, and the lifting capacity can be increased accordingly.

Further, when the jib is stored, the jib head (auxiliary sheave unit 12) is replaced with the tip of the boom.
This jib head does not interfere with the jib storage.

Other Embodiments (1) In the above embodiment, the boom telescopic cylinder C for the second stage is used.
The cylinder C is provided in the jib storage space S, but the cylinder C may be provided in the second stage boom 2.

(2) In the above embodiment, the auxiliary sheave unit 12 is also used as the jib head. However, these are provided separately so that the jib J can be stored in the jib storage space S with the jib head attached. You may comprise.

(3) In the above embodiment, the jib J is extended, and the jib support member 22 and the jib support roller 23 are provided on the base end side.
The boom head 4a is supported by
Alternatively, a rod or rope may be hung between the jib J and the jib J, whereby the jib J may be extended and supported.

[0052]

As described above, according to the present invention, the jib is stored in the jib storing space formed between the inner surface of the bottom plate of the basic boom and the outer surface of the bottom plate of the second stage boom. Irrespective of the above, the jib can be stored in the boom while avoiding the interference between the jib and the boom extension / contraction means.

Further, as compared with the case where the jib is stored in the second stage boom, since the storage position is lower, the jib storage and extension operation can be performed easily and safely.

On the other hand, according to the second aspect of the invention, the jib storage space can be shared by the boom telescopic cylinder for extending and retracting the second stage boom with respect to the basic boom while avoiding the interference of the jib. As compared with the case where the same cylinder is provided in the second stage boom, there is more space in the second stage boom, and the boom telescopic means for the other stage boom can be easily installed.

According to the third aspect of the present invention, the auxiliary sheave unit used only during normal work can also be used as the jib head during jib work. Therefore, the auxiliary sheave unit remains attached to the boom tip. Compared with the case of performing work, the weight of the boom tip during jib work can be lightened, and the lifting capacity can be increased accordingly.

Furthermore, when the jib is stored, the jib head is replaced with the boom tip as an auxiliary sheave unit, so that the jib head does not interfere with the jib storage.

Further, according to the invention of claim 4, when the jib is pulled out from the jib storing space when the jib is extended, the jib foot pin hole is automatically aligned with the auxiliary sheave unit mounting pin hole at the tip of the boom. Becomes easier,
Jib overhang operation becomes easy. Moreover, the pin hole for mounting the auxiliary sheave unit can also be used as the pin hole for mounting the jib when the jib is extended, so the structure is simple.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a jib stored state showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

FIG. 5 is a perspective view of a jib.

FIG. 6 is a partial cross-sectional side view of the jib overhanging state.

[Explanation of symbols]

 B boom 1 basic boom 2 second stage boom 3 third stage boom 4 tip boom 4a boom head S jib storage space J jib 31 jib storage holding pin as jib holding means 12 auxiliary sheave unit also used as jib head 10 auxiliary sheave unit Auxiliary sheave 11 constituting the same Sheave bracket 11a Common mounting part 13 Supplementary rope C Boom telescopic cylinder C1 Cylinder tube 16 Boom head pin hole 21 Jib foot pin hole L Jib axis line passing through the jib foot pin hole

Claims (4)

[Claims] 1. A boom comprising a basic boom and a movable boom having one to a plurality of stages so as to be extendable and contractible, and a jib extended at the tip of the boom. The jib has a supplementary winding at the tip. In a crane provided with a jib head having a sheave through which a rope is passed, the jib is provided between an inner surface of the bottom plate of the basic boom and an outer surface of the bottom plate of the second stage boom.
A jib storage holding means for forming a jib storage space for storing the jib in the length direction of the basic boom when not in use, and for holding the jib in the jib storage space. Characteristic crane jib storage device. 2. The jib retracting device for a crane according to claim 1, wherein a boom telescopic cylinder for extending and retracting the second stage boom with respect to the basic boom is provided, and a rod end of the boom telescopic cylinder is a basic boom in the jib storage space and a rod of a cylinder tube. A jib storage device for a crane, wherein the jib storage device is arranged with its side ends attached to the second stage boom, and the jib is formed into a tubular shape that can be externally fitted to the boom telescopic cylinder in the jib storage space. . 3. The jib storage device for a crane according to claim 1, wherein the auxiliary sheave includes an auxiliary sheave through which a supplementary rope is passed, and a sheave bracket that rotatably supports the auxiliary sheave, at a tip of the boom. The unit is detachably attached, so that this auxiliary sheave unit also functions as a jib head, so that the auxiliary sheave bracket of the unit
A jib retracting device for a crane, comprising a common mounting portion detachably mounted to the boom tip and the jib tip. 4. The jib storage device for a crane according to claim 3, wherein a jib foot pin hole is formed at a base end portion of the jib to be pin-connected to a boom tip in a state where the jib is extended, and an auxiliary sheave unit is pin-connected. A jib retractor for a crane, characterized in that a pin hole at the boom tip is provided on the jib axis passing through the jib foot pin hole in the jib retracted state.