JPH11199177A - Crane jib overhang and storage method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a working labor burden by inclining a jib oscillation central shaft and a jib distortional rotation central line shaft against a shaft orthogonal with a boom shaft center and setting them roughly in parallel with each other so that they respectively become roughly vertical in a boom angle state in a jib trailing process. SOLUTION: A jib 2 is oscillated around a jib oscillation central shaft 7 as its center until a jib foot 17 of the jib 2 is overlapped with a jib installation bracket 11 of a boom 1 and they match with each other in the vertical direction by removing a jib head end fixing pin 10. In this state, a jib distortional rotation central shaft is inserted into a jib foot hole 17a and a jib installation hole 11a by straddling on them. Thereafter, a jib main body 13 is hung down around a horizontal shaft 14 as its center through a boom standing cylinder of the boom 1 and a jib standing cylinder 20 after removing an intermediate fixing pin 8. The installation pin is inserted in respective jib fitting hole 16a and jib installation hole 12a by straddling them by distortionally rotating the jib distortional rotation central shaft by roughly 180 deg. as its center and putting a jib fit 16 on a jib installation bracket 12 of the boom 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wheel crane,
The present invention relates to a jib overhang, a storage method, and an apparatus for storing a jib on a side surface of a boom when the jib is not used, and extending the jib to a tip of the boom when not in use.

[0002]

2. Description of the Related Art Conventionally, as a method of extending and storing a jib of a crane, a jib in which a base end (a so-called jib foot) is stored on a side surface of a telescopic boom with the base end thereof facing the boom tip side is subjected to the following steps. It is known that the data is stored by the reverse procedure.

[0003] The jib is fixed to the side surface of the boom, with the base end portion being laterally away from the boom tip so that the base end does not hinder the extension and retraction of the boom. Is stored.

A jib swinging step of swinging the jib in a horizontal direction around a jib swing center axis provided at an intermediate fixed portion to a position where one side of the base end overlaps the tip of the boom in a horizontal state of the boom.

[0005] A jib hanging process in which the boom is raised with the one side of the jib base end connected to the boom tip, and the jib is hung down below the boom tip with the jib tip separated from the ground surface.

In this hanging state, the jib is rotated by approximately 180 ° until the other end of the jib can be connected to the boom tip.
A jib twisting process for twisting.

After twisting the jib, the jib is raised in front of the boom to complete the extension of the jib.

In this prior art, the torsion center axis in the above-mentioned jib twisting step is set perpendicular to the boom axis, so that the torsion center axis is vertical when the boom is in a horizontal state. In a state where a boom is caused by hitting, a state of inclining backward is obtained.

Therefore, when the jib is twisted, the jib is moved up and down, so that a large operation force is required and there is a problem that the labor burden of the operator is increased.

Therefore, as a countermeasure against this point, Japanese Unexamined Patent Publication No.
As shown in Japanese Patent No. 67087, a state in which the jib torsion is inclined with respect to an axis orthogonal to the boom axis so that the jib torsion center axis is vertical in a state where the boom is raised by hitting the jib torsion. , The vertical movement of the jib in the jib twisting step has been eliminated.

[0011]

However, according to this known technique, there are the following problems.

As described above, the jib is swung about the swing center axis provided in the intermediate fixing mechanism in the jib swinging step.

In the prior art, as the jib intermediate fixing mechanism, an intermediate fixing bracket is provided on each of the jib side and the boom side, and an intermediate fixing pin is inserted into a hole of each of the intermediate brackets on both sides so as to be parallel to the boom axis (horizontal direction). Insert
This pin insertion portion is used as a swing fulcrum.

However, according to this configuration, the jib torsion center axis is inclined with respect to an axis orthogonal to the boom axis (forward inclined when viewed from the side in the horizontal state of the boom), and is made vertical when viewed from the front and rear surfaces. However, since the upper and lower holes on the jib arranged on the torsion center line (hereinafter referred to as torsion center holes) have different movement distances due to the swing, the torsion center holes on the boom side and the jib coincide in the jib swing state. Without this, the torsion center axis cannot be inserted.

In this case, if the diameter of the torsion center holes on the jib side and the boom side is set to be considerably larger than the torsion center axis, the insertion of the torsion center axis itself becomes possible.
This is inconvenient for the connection between the boom and the jib, which requires a strong pin connection state.

The upper and lower torsion center holes can be aligned by inclining the torsion center axis with respect to an axis orthogonal to the cylinder axis in a side view and also in an anteroposterior view. Since the center axis cannot be made vertical, and as a result, the jib moves up and down when twisting, the intended purpose of eliminating this up and down movement cannot be achieved.

Further, even if the intermediate fixing pin is set to the vertical axis (perpendicular to the boom axis), the above-mentioned problem cannot be solved.

In view of the above circumstances, the present invention is based on the premise that the jib torsion center axis is inclined with respect to an axis orthogonal to the boom axis so that the jib torsion axis is substantially vertical when the jib is suspended. An object of the present invention is to provide a crane jib extension and storage method and a crane that can align upper and lower torsion center holes on a jib side into which a torsion center axis is inserted and a boom side on a torsion center line.

[0019]

According to a first aspect of the present invention, there is provided a method for extending and storing a jib, comprising the steps of: In the method of extending and retracting the jib of the crane that stores the jib through the reverse process, the jib swing center axis in the jib swing process and the jib torsion center line axis in the jib twisting process are respectively set in the boom in the jib hanging process. It is set so as to be substantially vertical in the angled state, inclined with respect to an axis orthogonal to the boom axis and substantially parallel to each other.

(I) A jib for swinging the jib in the left-right direction about the jib swing center axis until one side of the base end of the jib is separated from the side of the boom to a state in which the jib can be connected. Swing process.

(Ii) A jib drooping in which the boom is raised and the jib is hung below the boom tip with the jib tip separated from the ground surface with the one end of the jib proximal end connected to the boom tip. Process.

(Iii) A jib twisting step of twisting the jib in this hanging state until the other end of the jib base end can be connected to the boom tip.

The invention according to claim 2 (jib overhang, storage device)
The jib stored on the side of the telescopic boom,
(i) to (iii) overhang to the end of the boom through the process, the jib overhang of the crane was stored through the reverse process, in the storage device, jib swing center axis in the jib swing process, and The jib torsion center axis in the jib torsion step is set to be inclined with respect to an axis orthogonal to the boom axis and to be substantially parallel to each other so that the jib torsion center axis is substantially vertical in a boom angle state in the jib hanging step. .

(I) A jib for swinging the jib in the left-right direction around the jib swing center axis until one side of the base end of the jib is separated from the side of the boom tip to a connectable state. Swing process.

(Ii) A jib drooping in which the boom is raised with the one side of the jib base end connected to the boom tip and the jib is hung down below the boom tip with the jib tip separated from the ground surface. Process.

(Iii) A jib twisting step of twisting the jib in this hanging state until the other end of the jib base end can be connected to the boom tip.

According to a third aspect of the present invention, in the configuration of the second aspect, the jib is connected to the jib body and the base end of the jib body so as to be rotatable around the jib hanging center axis in the jib hanging process. The jib bracket is provided with a boom connecting portion connected to the boom tip by a jib torsion center axis in the jib torsion process.

According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the jib and the engaging means for preventing rotation about the jib torsion center axis in the jib hanging process are provided on the side surface of the boom in which the jib is stored. It is provided.

According to the above method and apparatus, since the swing center axis in the jib swing step is set substantially parallel to the jib twist center axis, the twist center axis is inclined with respect to the axis orthogonal to the boom axis. With this configuration, the movement distances of the upper and lower torsion center holes on the jib due to the jib swing become equal, and the jib-side torsion center holes can be made to coincide with the boom-side torsion center holes.

Thus, it is actually possible to adopt a configuration in which the torsion center axis is inclined with respect to an axis orthogonal to the boom axis.

Further, according to the structure of the fourth aspect, the jib does not rotate (tilt or fall) around the torsion center axis toward the boom side during the jib hanging process.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

In each figure, 1 is a boom and 2 is a jib.

In FIG. 1, reference numeral 3 denotes a revolving frame of a crane upper revolving unit in which the boom 1 is attached to the boom foot pin 4 so as to be able to move up and down.

The boom 1 is configured to be extendable and contractable by a basic boom 1a, one or more intermediate booms 1b, and a tip boom 1c.

When not used, the jib 2 is located on the left side of the boom 1 (basic boom 1c) as shown in FIGS. 1 and 2 (the left side as viewed from the revolving frame 3; the same applies to the left and right directions described below). It is stored and used when the boom 1 (tip boom 1)
It protrudes to the tip of c).

The boom 1 is provided with a middle fixing bracket 5 at a position near the front end of the middle portion on the left side surface of the basic boom 1a, and a front end fixing bracket 6 at the base end as a structure for storing the jib 2. I have.

The intermediate fixing bracket 5 is provided with the basic boom 1a.
The jib 2 is rotatably mounted around a jib swing center axis 7, and the jib 2 is fitted into the intermediate fixing bracket 5 from below in a boom horizontal state and is fixed by a horizontal horizontal fixing pin 8 in the left-right direction. .

As shown in FIG. 8, the distal end fixing bracket 6 has an upper protruding piece 6a protruding long to the side of the boom, and a short lower protruding piece 6b on the lower side, and the jib 2 has both side protruding pieces 6a. , 6b, the two projecting pieces 6a, 6b
The jib tip is fixed to the boom side by inserting the tip fixing pin 10 across the jib side bracket 9 provided on the jib 2.

The boom 1 is provided with a pair of upper and lower jib mounting brackets 11, 11, 12, 12 on the left and right sides of the distal end of the distal boom 1c, respectively, as a structure for extending the jib 2.
Numerals 12 protrude laterally and are provided vertically parallel.

The two jib mounting brackets 11, 11,
Jib mounting holes 11a, 11a,
12a are provided.

On the other hand, the jib 2 is connected to the jib body 13 and a base end portion of the jib body 13 so as to be rotatable around a horizontal axis 14 in the horizontal direction which also serves as a jib hanging center axis and a jib up / down center axis. And a jib bracket 15.

The jib bracket 15 has left and upper left and right jib feet 16 and 1 as a boom connecting portion in the retracted state.
6. The right side jib feet 17, 17 are provided on the upper and lower right sides, respectively, and these two side jib feet 16, 16, 17, 17 are provided.
When the jib is extended, the boom-side jib mounting bracket 11,
11, 12, 12 jib mounting holes 11a, 11a, 12
Jib foot holes 16a, 16a, 1 corresponding to a, 12a
7a and 17a are provided.

On the left side of the tip of the basic boom 1a,
An arcuate guide rail 18 is provided from the upper end to the lower end, and a guide roller 19 that can roll along the guide rail 18 at a position near the middle base end of the jib 2.
(See FIGS. 4 and 5).

The middle part of the jib 2 and the jib bracket 1
5, a jib hoisting cylinder (hydraulic cylinder) 20 also serving as a jib overhang cylinder is provided.

In the retracted state, as shown in FIGS. 2 and 4, the jib 2 is located at a position where the right jib foot 17, 17 is leftwardly separated from the left jib mounting brackets 11, 11 of the boom 1.

The jib-side guide roller 19 is also located at a position deviated leftward from the boom-side guide rail 18.

Further, as shown in FIG. 1, the jib hoist cylinder 20 is in an extended state.

The jib 2 is extended from this state through the following steps.

(I) Jib swinging step The jib tip fixing pin 10 is removed.

As shown in FIGS. 3 and 5, the right jib foot 17, 17 of the jib 2 overlaps the left jib mounting bracket 11, 11 of the boom 1 so that the jib foot holes 17a, 17a of each other.
The jib 2 is swung about the jib swing center shaft 7 in the direction indicated by the arrow in FIG. 4 until the jig mounting holes 11a and 11a coincide with the vertical direction.

In this state, the jib torsion center shaft 21 (the jib tip fixing pin 10 can be diverted) is connected to the jib foot holes 17a, 17a and the jib mounting holes 11a, 1a.
1a.

(Ii) Jib hanging process After the intermediate fixing pin 8 is removed, the boom 1 is raised by a boom hoist cylinder (not shown), and the jib hoist cylinder 20 is reduced, so that the two points shown by the solid line in FIG. The jib body 13 is hung around the horizontal axis 14 as shown by a chain line.

The boom angle at this time is an angle at which the lower end of the jib 2 is slightly separated from the ground surface.

The jib-side guide roller 19 faces the guide rail 18 from above by a jib swing operation, engages with the guide rail 18 at the initial stage of jib hanging, and rolls along the jib hanging along the guide rail 18. I do.

Thus, the jib body 13 is prevented from rotating around the jib torsion shaft 21 to the side of the boom and tilting or falling down during the hanging of the jib.

(Iii) Jib twisting step After the jib drooping, the jib 2 is twisted approximately 180 ° in the direction of arrow B in FIG. 5 about the jib twisting central axis 21 as shown by the solid line in FIG. 7 and the two-dot chain line in FIG. , The left jib foot 16 is superimposed on the right jib mounting bracket 12 of the boom 1,
The jib foot holes 16a, 16a of each other and the jib mounting holes 12
right jib mounting pin (not shown)
Insert

The right jib mounting pin may be inserted by remote operation of a hydraulic cylinder (not shown), or after the jib raising operation performed thereafter, the boom 1 and the jib 2 are manually turned down. May be inserted.

As a result, the base end of the jib 2 is connected to the tip of the boom. After that, the jib up / down cylinder 20 is extended to raise the jib 2 as shown by the one-dot chain line in FIG. Overhang.

On the other hand, the storage of the jib 2 is performed in the reverse procedure.

Here, the jib swing center axis 7 serving as the jib swing center in the jib swing step (i) and the jib twist center axis 21 serving as the jib torsion center in the jib twist step (iii) are as follows. An axis X (shown in FIG. 6) perpendicular to the boom axis is substantially vertical (complete vertical or very close to this) in a jib hanging state shown by a two-dot chain line in FIGS. 6 and 7. They are inclined and set parallel to each other.

The term "parallel" used herein includes not only completely parallel but also a state very close to this.

In this way, the moving distances of the jib foot holes (jib side torsion center holes) 17a, 17a on the right and upper sides of the jib 2 due to the jib swinging in the direction of the arrow in FIG. 4 become equal, and the torsion center axis 21 is set to the boom axis. The jib side torsion center holes 17a, 17 are tilted with respect to the orthogonal axis X.
a to the boom-side torsion center hole (left jib foot hole) 11a,
11a.

As a result, it is actually possible to adopt a configuration in which the torsion center axis 21 is inclined with respect to the axis X orthogonal to the boom axis.

As shown in FIG. 1, the jib tip fixing pin 10 is also arranged substantially parallel to the jib swing shaft 7.

In the above embodiment, the jib 2 is hung down using the jib up / down cylinder 20 and is raised forward after the torsion. However, the jib 2 is mounted on the crane main body as the jib drooping and jib raising means. A winch hoisting rope may be used.

[0067]

As described above, according to the present invention, the swing center axis in the jib swinging step and the jib torsion center axis in the jib twisting step are substantially vertical in the boom angle state in the jib hanging down step. So that it is inclined with respect to the axis perpendicular to the boom axis and substantially parallel to each other. The movement distance of the upper and lower torsion center holes on the jib side becomes equal, and the jib side torsion holes can be matched with the boom side torsion holes.

As a result, it becomes practically possible to incline the torsion center axis with respect to the axis perpendicular to the boom axis, that is, to twist the jib about a substantially vertical axis.

Further, according to the fourth aspect of the present invention, there is no possibility that the jib rotates around the torsion axis toward the boom side during the jib hanging process.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a jib retracted state showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a schematic plan view showing a state where the jib is swung from the state shown in FIG. 2;

FIG. 4 is a partially enlarged view of the state of FIG. 2;

FIG. 5 is a partially enlarged view of the state of FIG. 3;

FIG. 6 is a schematic side view showing a state where the jib is suspended from the state shown in FIGS.

FIG. 7 is a schematic side view showing a state in which the jib is twisted after hanging.

FIG. 8 is an enlarged sectional view taken along line VIII-VIII of FIG. 1;

[Explanation of symbols]

1 boom 2 jib 13 jib body 15 jib bracket 14 horizontal axis which becomes the jib hanging center 16, 16 left jib foot (boom connection part) 17, 17 right jib foot (boom connection part) 17a, 17a right jib foot hole (jib) 11, 11a Left jib mounting bracket for the boom 11a, 11a Jib mounting hole (boom side torsion center hole) 12, 12 Right jib mounting bracket for the boom 7 Jib swing center axis 21 Jib torsion center axis

Claims (4)

[Claims] 1. A crane jib extension and storage in which a jib stored on a side surface of a telescopic boom is extended to the end of the boom through the following steps (i) to (iii), and stored in a reverse process. In the method, the jib swing center axis in the jib swing step, and the jib torsion center line axis in the jib torsion step, respectively, are substantially perpendicular to the boom angle state in the jib hanging step, so as to be perpendicular to the boom axis. A crane jib overhanging and retracting method characterized by being inclined with respect to and substantially parallel to each other. (i) A jib swinging step of swinging the jib in the left-right direction about the jib swing center axis until one side of the jib proximal end is separated from the side of the boom tip to a connectable state. . (ii) A jib hanging down step in which the boom is raised with the one side of the jib base end connected to the boom tip, and the jib is hung down below the boom tip with the jib tip separated from the ground surface. (iii) A jib twisting step of twisting the jib in the hanging state of the jib until the other end of the jib base end can be connected to the boom tip. 2. A jib for a crane, wherein the jib stored on the side surface of the telescopic boom is extended to the end of the boom through the following steps (i) to (iii) and stored in the reverse step. In the overhang and storage device, the jib swing center axis in the jib swinging step and the jib torsion center axis in the jib twisting step are each orthogonal to the boom axis so that they are substantially vertical in the boom angle state in the jib hanging down step. A crane jib overhanging and retracting device which is set to be inclined with respect to an axis to be rotated and substantially parallel to each other. (i) A jib swinging step of swinging the jib in the left-right direction about the jib swing center axis until one side of the jib proximal end is separated from the side of the boom to a connectable state. . (ii) A jib hanging down step in which the boom is raised with the one side of the jib base end connected to the boom tip, and the jib is hung down below the boom tip with the jib tip separated from the ground surface. (iii) A jib twisting step of twisting the jib in the hanging state of the jib until the other end of the jib base end can be connected to the boom tip. 3. The crane according to claim 2, wherein:
In the storage device, the jib includes a jib body and a jib bracket rotatably connected to a base end of the jib body around a jib hanging center axis in a jib hanging process. A jib extension and storage device for a crane, wherein a boom connecting portion connected to a boom tip by a jib torsion center axis in a twisting step is provided. 4. A jib extension and storage device according to claim 2, wherein the jib and a side surface of the boom in which the jib is stored are engaged with each other to prevent the jib from turning around a jib torsion center axis in a jib hanging process. A crane jib overhang and storage device, characterized in that means are provided.