JPH11228076A - Device for changing the number of turns of a wire rope in a crane and a method for changing the number of turns - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the number of turns of a wire rope, and to make a sheave for changing the number of turns of a wire rope detachable, thereby reducing the weight of the hook. A crane having a tiltable boom (5) attached thereto and a hook (6) for lifting a load attached to the tip of the boom (5) via a wire rope (7) is provided. And a detachable wire rope 7 is wound around the sheave engaging portion 15 formed at the tip of the boom 5 and the hook 6, and the number of turns of the wire rope 7 is changed. The sheaves 20 together constitute a winding number changing device for a wire rope in a crane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for changing the number of turns of a wire rope according to a lifting load in a wire rope for hanging a hook for lifting a load in a crane.

[0002]

2. Description of the Related Art Conventionally, a rough terrain crane, which is a type of a crane, includes a lower traveling body to which tires are mounted, and a swivel base that is rotatable is mounted on an upper part of the lower traveling body. A boom that can be tilted by a cylinder is attached, and a hook for lifting a load is attached to a tip of the boom via a wire rope.
To attach the hook, a tip sheave is fixed to the tip of the boom, and a wire rope that can be lifted and lowered by a winch is wound around the tip sheave, and a hook is attached to the tip of the wire rope. And
This hook has a bracket and a hook-shaped hook body for hanging a load at the lower part of the bracket, and has a plurality of sheaves in parallel on the upper part thereof. In addition, a plurality of sheaves are attached in parallel to a tip sheave fixed to the tip of the boom.

[0003] Usually, the number of turns of the wire rope is changed according to the lifting load in order to be able to lift the load from light to heavy. Regarding the number of turns of this wire rope, if the lifting load is light,
One end of the wire rope wound around the sheave is attached to the hook by hooking. On the other hand, when the lifting load is heavy, the wire rope wound around the sheave at the tip is once wound around the sheave of the hook, then wound around the tip sheave, and the tip is attached to the hook to make three hooks. In the case of three hooks, the lifting and lowering speed of the hook is, of course, one third that of the single hook.

In order to change the number of turns of the wire rope, for example, when changing from one hook to three hooks, first remove the tip of the wire rope attached to the hook, and then wrap the wire rope once on the sheave of the hook. Further, the work is wound around the tip sheave and the tip is attached to the hook again. For this reason, it is necessary to remove and attach the tip of the wire rope, wrap the wire rope around the sheave of the hook, which is a narrow space, and wrap the wire rope around the tip sheave, which has been very troublesome and troublesome. .

Therefore, conventionally, as shown in Japanese Patent Application Laid-Open No. Hei 7-228475, a detaching block is detachably attached to a hook, and the detaching block is detachably attached to a support provided at the end of the boom. Then, the wire rope wrapped around the tip sheave fixed to the tip of the boom is wrapped around the sheave of the hook, and then attached to the separation block. There has been known a configuration in which a separation block is detached from a hook and attached to a support at the end of a boom to change the number of turns of a wire rope.

[0006]

SUMMARY OF THE INVENTION Such Japanese Patent Application Laid-Open No. 7-22 is disclosed.
No. 8,475, it is true that the number of turns of the wire rope can be easily changed. However, the separation block is inevitably heavy due to its structure. Usually, since the hook is attached to the hook, the weight of the hook is increased, and the lifting ability of the crane is reduced accordingly. Further, the number of turns of the wire rope can be changed only once, for example, from two to four, and cannot be changed a plurality of times, such as two to four, four to six. Was. An object of the present invention is to provide a wire rope winding number changing device and a winding number changing method that can easily change the number of turns of a wire rope and can solve the above-described problem.

[0007]

A first aspect of the present invention provides a crane having a tiltable boom attached thereto, and a hook for lifting a load attached to a tip of the boom via a wire rope. A sheave engagement portion formed at the tip of the boom and the hook, respectively, and a detachable wire rope wound around a sheave engagement portion formed at the tip of the boom and the hook, thereby changing the number of turns of the wire rope. This is a wire rope winding number changing device in a crane comprising an even number of sheaves.

According to the first invention, an even number of sheaves around which a wire rope is wound are attached to a sheave engaging portion formed at the end of the boom and a sheave engaging portion formed at the hook, and the wire rope is wound. By changing the number of turns, it is possible to eliminate the conventional work of removing and attaching the tip of the wire rope, or wrapping the wire rope around the sheave of the hook or the tip sheave, which is a narrow space. Can be extremely easily changed. Moreover, by making the sheave detachable and attaching the sheave only when necessary, the weight of the hook can be reduced, and the lifting capacity of the crane can be increased by reducing the weight here. In addition, by increasing the number of even sheaves as necessary, the number of turns of the wire rope can be easily changed a plurality of times, for example, from 2 to 4, or from 4 to 6.

According to a second aspect of the present invention, there is provided a crane in which a tiltable boom is attached, and a hook for lifting a load is attached to a tip of the boom via a wire rope. A sheave engaging portion is formed, and the sheave engaging portion has a detachable sheave. A sheave is wound around a hanging wire rope, and the sheave is connected to one of the sheave engaging portions on the boom side or the hook side. To pull out the wire rope from here, wrap another sheave around the drawn wire rope, and attach this sheave to the other sheave engagement part on the boom side or hook side to change the number of turns of the wire rope This is a method for changing the number of turns of a wire rope in a crane.

According to the second aspect of the present invention, it is possible to eliminate the conventional work of removing and attaching the tip of the wire rope, or winding the wire rope around the sheave of the hook or the tip sheave which is a narrow space. Can,
The work of changing the number of turns of the wire rope can be performed very easily by, for example, one worker.

According to a third aspect of the present invention, there is provided a crane in which a tiltable boom is attached, and a hook for lifting a load is attached to a tip of the boom via a wire rope. Each of the sheave engaging portions is formed, and the sheave engaging portion has a detachable sheave, and two sheaves are wound around a hanging wire rope, respectively. This is a method for changing the number of turns of a wire rope in a crane in which the number of turns of a wire rope is changed by attaching the sheave engagement portion on the boom side and the sheave engagement portion on the hook side located on opposite sides.

According to the third aspect of the present invention, the number of turns of the wire rope can be changed extremely easily, and
By attaching two sheaves simultaneously in the operation, the operation time can be significantly reduced.

According to a fourth aspect of the present invention, there is provided a crane having a tiltable boom attached thereto and a hook for lifting a load attached to the tip of the boom via a wire rope. A sheave engaging portion is formed, and the sheave engaging portion has a detachable sheave, and each of the two sheaves is attached to the boom-side sheave engaging portion and the hook-side sheave engaging portion. With the rope wound up, the hook and the end of the boom are brought close to each other, and in this close state, the sheave attached to the sheave engaging portion on the hook side is attached while winding the wire rope around the sheave engaging portion on the boom side, and the boom Attach the sheave attached to the sheave engaging part on the hook side while winding the wire rope around the sheave engaging part on the hook side. In which two of the turns changing the wire rope in crane so as to change the number of turns of wire rope by respective sheaves removed from the sheave engaging portion on the side which was attached to a first replace the two sheaves.

According to the fourth aspect of the present invention, the operation of changing the number of turns of the wire rope can be performed extremely easily.
By attaching the two sheaves to the sheave engaging portion in advance in the work, the work of lifting the sheave can be eliminated, and the burden on the operator can be reduced.

[0015]

Embodiments of the present invention will be described. As shown in FIG. 1, the rough terrain crane includes a lower traveling body 2 to which front and rear tires 1 are attached.
A swivel 3 that can be swiveled is attached to the upper part of the lower traveling body 2, a boom 5 that can be tilted by an up-and-down cylinder 4 is attached to the upper part of the swivel 3, and a hook for lifting a load at the tip of the boom 5 6 is attached via a wire rope 7. To attach the hook 6, a tip sheave 8 is fixed to the tip of the boom 5, a wire rope 7 that can be wound up and down by a winch is wound around the tip sheave 8, and the hook 6 is attached to the tip of the wire rope 7. Become like As shown in FIG. 2, the hook 6 has a hook-shaped hook body 12 for suspending a load at a lower portion of a columnar block 11, and a block 11 at an upper portion thereof.
The tip of the wire rope 7 is attached to the upper surface of the wire rope.

In such a structure, as shown in FIG.
The sheave engaging portion 15 has a substantially triangular plate shape, and a through hole 16 is formed substantially at the center. Note that a plurality of the sheave engaging portions 15 are formed.

A sheave engaging portion 15 is also formed on the upper surface of the block 11, which is the upper portion of the hook 6, and the sheave engaging portion 15 also has a substantially triangular plate shape, and the through hole 1 is formed substantially in the center.
6 is formed. Note that a plurality of the sheave engagement portions 15 are also formed.

On the other hand, an even number of sheaves 20 which are detachable from the sheave engaging portion 15 formed on the hook 6 or the sheave engaging portion 15 formed on the tip of the boom 5 are provided. A pair of plate-shaped brackets 21 are provided so as to face each other via a shaft 22, and a sheave body 23 around which the wire rope 7 is wound around a shaft between the pair of brackets 21 is rotatably mounted. A through hole 24 is formed in each of the upper and lower portions of the pair of brackets 21.

The sheave 20 is attached to a sheave engaging portion 15 formed at the end of the boom 5 by a pair of brackets 21 of the sheave 20, as shown in FIG.
The sheave 20 is arranged so as to sandwich the sheave engaging portion 15 formed at the tip of the sheave, and the fixing pin 25 is inserted over the through hole 24 of the pair of brackets 21 and the through hole 16 of the sheave engaging portion 15. It is attached to the sheave engaging portion 15. A hole 26 is formed at the tip of the fixing pin 25 in a direction orthogonal to the longitudinal direction of the fixing pin 25, and the retaining pin 27 is inserted into the hole 26 so that the fixing pin 25 Through the through hole 16 of the sheave 20 or the through hole 24 of the sheave 20.

The sheave 20 is attached to the sheave engaging portion 15 formed on the hook 6 such that the sheave engaging portion 15 formed on the hook 6 is sandwiched between a pair of brackets 21 of the sheave 20 as shown in FIG. And the fixing pin 25 is inserted into the through hole 24 of the pair of brackets 21 and the through hole 16 of the sheave engaging portion 15, so that the sheave 20 is attached to the sheave engaging portion 15. A hole 26 is also formed at the tip of the fixing pin 25 in a direction orthogonal to the longitudinal direction of the fixing pin 25, and a retaining pin 27 is inserted into the hole 26.

In such a structure, the number of turns of the wire rope 7 is changed according to the lifting load so that the load can be lifted from light to heavy. Will be described below.

A method for changing the number of turns of the wire rope 7 will be described with reference to FIGS. The wire rope 7 is suspended (shown in FIG. 3A), and the first sheave 20a is wound around the suspended wire rope 7 (FIG. 3A).
(Shown in FIG. 3B), and the first sheave 20a is attached to the sheave engaging portion 15 on the boom 5 side (shown in FIG. 3C). Then, the first sheave 20a and the tip sheave 8
The wire rope 7 is pulled out from the space (shown in FIG. 4 (d)), and another second sheave 20b is wound around the drawn wire rope 7 (shown in FIG. 4 (e)). Is attached to the sheave engaging portion 15 on the hook 6 side (shown in FIG. 4 (f)), so that three hooks are provided.

In this way, the number of turns of the wire rope 7 is changed from one to three. In addition, when changing from three to one, the above operation may be reversed.

By changing the number of turns of the wire rope 7 as described above, it is possible to remove and attach the tip of the wire rope as in the related art, or to wind the wire rope around the sheave of the hook or the tip sheave which is a narrow space. Work such as hanging can be eliminated, and the work of changing the number of turns of the wire rope 7 can be performed extremely easily by, for example, one worker. Moreover, the sheave 20 is made detachable,
By attaching the sheave 20 only when necessary, the sheave 20 is not normally attached to the hook 6, so that the weight of the hook 6 can be reduced by the amount of the sheave 20. Lifting capacity can be increased.

Another method of changing the number of turns of the wire rope 7 will be described with reference to FIGS. The wire rope 7 is set in a hung state (shown in FIG. 5A), and the first sheave 20a located on the lower side and the second sheave 20b located on the upper side are wound around the hung wire rope 7, respectively ( 5B), the first and second two sheaves 20a and 20b are turned upside down while being inverted (shown in FIG. 6C), and the first sheave 20a is turned on.
Into the sheave engaging portion 15 on the boom 5 side.
By simultaneously attaching b to the sheave engaging portion 15 on the hook 6 side (as shown in FIG. 6D), a state of three hooks is obtained.

In this way, the number of turns of the wire rope 7 is changed from one to three. In addition, when changing from three to one, the above operation may be reversed.

By changing the number of turns of the wire rope 7 as described above, it is possible to remove and attach the tip of the wire rope as in the related art, or to wind the wire rope around the sheave of the hook or the tip sheave which is a narrow space. The work such as hanging can be eliminated, and the work of changing the number of turns of the wire rope 7 can be performed extremely easily. In addition, in the work, by simultaneously attaching the two sheaves 20 to the sheave engaging portion 15 on the boom 5 side and the sheave engaging portion 15 on the hook 6 side, the wire rope 7 is not pulled out, and the work time is reduced. Significantly shorten. In addition, the sheave 20 is detachable so that the sheave 2 can be used only when necessary.
By attaching 0, the sheave 20 is not normally attached to the hook 6, so that the weight of the hook 6 can be reduced by the amount of the sheave 20, and the lifting capacity of the crane can be reduced by reducing the weight here. Can be raised.

Further, another method of changing the number of turns of the wire rope 7 will be described with reference to FIGS. When the wire rope 7 is hung, the first sheave 20a
Is attached to the sheave engaging portion 15 on the hook 6 side, and the second sheave 20b is attached to the sheave engaging portion 15 on the boom 5 side (shown in FIG. 7A). Then, the wire rope 7 is wound up and the hook 6 and the tip of the boom 5 are brought close to each other,
In this close state, the first sheave 20a attached to the sheave engagement portion 15 on the hook 6 side is wound around the wire rope 7 while the other sheave engagement portion 15 on the boom 5 side is wound.
(See FIG. 7B) using another through hole 24 formed in the pair of brackets 21 of the sheave 20a, and the second sheave 20b attached to the sheave engaging portion 15 on the boom 5 side. Is wound around another sheave engaging portion 15 on the hook 6 side while the wire rope 7 is wound around.
0b, another through hole 24 formed in a pair of brackets 21
(Shown in FIG. 8C), that is, both the first and second sheaves 20a and 20b are connected to the sheave engaging portion 15 on the boom 5 side and the sheave engaging portion 15 on the hook 6 side. To be mounted on. Then, in the first and second two sheaves 20a and 20b, the first sheave 20a is detached from the sheave engagement portion 15 on the side to which it was originally attached, that is, the first sheave 20a from the sheave engagement portion 15 on the hook 6 side. At the same time, remove the second sheave 2 from the sheave engagement portion 15 on the boom 5 side.
0b is removed, and the two sheaves 20a and 20b are replaced. Then, when the wire rope 7 is lowered (FIG. 8)
(Shown in (d)), the hook 6 is lowered to a state of hanging three hooks.

In this way, the number of turns of the wire rope 7 is changed from one to three. In addition, when changing from three to one, the above operation may be reversed.

By changing the number of turns of the wire rope 7 as described above, the wire rope can be wound around the sheave of the hook or the sheave at the tip or the sheave at the tip where space is narrow, as in the conventional case. The work such as hanging can be eliminated, and the work of changing the number of turns of the wire rope 7 can be performed extremely easily. In this operation, the two sheaves 20 are attached to the sheave engaging portion 15 on the boom 5 side and the sheave engaging portion 15 on the hook 6 in advance, so that the sheave 20 can be engaged with the sheave on the boom 5 side. Eliminating the work of lifting to the part 15 reduces the burden on the operator.

Another method for changing the number of turns of the wire rope 7 will be described with reference to FIGS. 9 and 10. FIG. When the wire rope 7 is suspended, the first sheave 20a is set in advance.
And the second sheave 20b with the sheave engaging portion 15 on the boom 5 side.
The wire rope 7 is attached while being wound (see FIG. 9A). Then, the wire rope 7 is wound up to bring the hook 6 and the end of the boom 5 close to each other (shown in FIG. 9B), and in this close state, the second attached to the sheave engaging portion 15 on the boom 5 side. The sheave 20b is attached to the sheave engaging portion 15 of the hook 6 using another through hole 24 formed in the pair of brackets 21 of the sheave 20b (shown in FIG. 10C). Then, the second sheave 20b is detached from the sheave engaging portion 15 on the boom 5 side, that is, the second sheave 20b is replaced from the sheave engaging portion 15 on the boom 5 side to the sheave engaging portion 15 on the hook 6 side. . Then, as the wire rope 7 is lowered (shown in FIG. 10D), the hook 6 is lowered to be in a state of hanging three wires.

In this way, the number of turns of the wire rope 7 is changed from one to three. In addition, when changing from three to one, the above operation may be reversed.

By changing the number of turns of the wire rope 7 as described above, it is possible to remove and attach the tip of the wire rope as in the related art, or to wind the wire rope around the sheave of the hook or the tip sheave which is a narrow space. The work such as hanging can be eliminated, and the work of changing the number of turns of the wire rope 7 can be performed extremely easily. Further, in the work, the work of lifting the sheave 20 to the sheave engaging portion 15 of the boom 5 is eliminated by attaching the two sheaves 20 to the sheave engaging portion 15 of the boom 5 in advance. In addition to reducing the burden on the user, the weight of the hook 6 can be reduced by the amount of the sheave 20 by attaching the hook 6 to the sheave engaging portion 15 on the boom 5 side in advance. The lifting capacity of the crane can be increased.

When the number of turns of the wire rope 7 is changed from three to five, it can be changed by repeating the above-described operation, and it can be changed to seven. It is possible to easily change the number of turns of the wire rope 7 a plurality of times.

The change in the number of windings of the wire rope 7 has been described for the odd number of one to three, but the change of the number of turns for the even number of two to four is the same as described above. Can be changed in any way.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a rough terrain crane according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a wire rope winding number changing device according to an embodiment of the present invention.

FIG. 3A is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (B) It is a state explanatory view explaining the winding number change method of a wire rope. (C) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 4D is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (E) It is a state explanatory view explaining the winding number change method of a wire rope. (F) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 5A is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (B) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 6C is a state explanatory view illustrating a method of changing the number of turns of the wire rope. (D) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 7A is a state explanatory diagram illustrating a method of changing the number of turns of a wire rope. (B) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 8 (c) is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (D) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 9A is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (B) It is a state explanatory view explaining the winding number change method of a wire rope.

FIG. 10 (c) is a state explanatory view illustrating a method of changing the number of turns of a wire rope. (D) It is a state explanatory view explaining the winding number change method of a wire rope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... tire, 2 ... lower traveling body, 3 ... revolving base, 4 ... undulating cylinder, 5 ... boom, 6 ... hook, 7 ... wire rope, 8 ... tip sheave, 11 ... block, 12 ... hook body, 15 ... sheave Engaging portion, 16: through hole, 20: sheave, 20a: first sheave, 20b: second sheave, 21: bracket, 22: shaft, 23: sheave body, 24: through hole, 25: fixing pin, 26: hole, 27: retaining pin.

Claims (4)

[Claims] 1. A crane having a tiltable boom (5) attached thereto and a hook (6) for lifting a load attached to a tip of the boom (5) via a wire rope (7). A sheave engaging portion (15) formed at the tip of the boom (5) and the hook (6), respectively, and a sheave engaging portion (15) formed at the tip of the boom (5) and the hook (6). An even number of sheaves (20) for changing the number of turns of the wire rope (7) by winding the wire rope (7), which is detachable, from the wire rope (7). 2. A crane comprising a tiltable boom (5), and a hook (6) for lifting a load attached to a tip of the boom (5) via a wire rope (7). A sheave engaging portion (15) is formed at the tip of the boom (5) and the hook (6), and the sheave engaging portion (15) has a detachable sheave (20) and a hanging wire. A sheave (20) is wound around the rope (7), and the sheave (20) is attached to one of the sheave engaging portions (15) on the boom (5) side or the hook (6) side. ) Is pulled out, another sheave (20) is wound around the drawn wire rope (7), and this sheave (20) is put on the other sheave engaging portion (15) on the boom (5) side or hook (6) side. Attach It turns changing the wire rope in the crane, characterized in that it has to change the number of turns of the wire rope (7) in. 3. A crane having a tiltable boom (5) attached thereto and a hook (6) for lifting a load attached to a tip of the boom (5) via a wire rope (7). A sheave engaging portion (15) is formed at the tip of the boom (5) and the hook (6), and the sheave engaging portion (15) has a detachable sheave (20) and a hanging wire. Rope (7) with two sheaves (2
0), respectively, and the two sheaves (20) are turned over so that the sheave engagement portion (15) on the boom (5) side and the sheave engagement portion on the hook (6) side located on the opposite sides of each other. Wire rope (7) by attaching to the part (15)
A method for changing the number of turns of a wire rope in a crane, wherein the number of turns of the wire rope is changed. 4. A crane having a tiltable boom (5) attached thereto and a hook (6) for lifting a load attached to a tip of the boom (5) via a wire rope (7). A sheave engaging portion (15) is formed at the tip of the boom (5) and the hook (6), and the sheave engaging portion (15) has a detachable sheave (20). Each of the sheaves (20) is attached to the sheave engaging portion (15) on the boom (5) side and the sheave engaging portion (15) on the hook (6) side, and the wire rope (7) is wound up to form the hook (6). The sheave (20) attached to the sheave engaging portion (15) on the hook (6) side is brought into contact with the sheave engaging portion (15) on the boom (5) side. ) Wrap a wire rope (7) While attaching the sheave (20) attached to the sheave engaging portion (15) on the boom (5) side while winding the wire rope (7) around the sheave engaging portion (15) on the hook (6) side, After the attachment, each of the two sheaves (20) is detached from the sheave engaging portion (15) on the side where the two sheaves were originally attached, and the two sheaves (20)
Wherein the number of turns of the wire rope is changed by changing the number of turns of the wire rope.