JP2002193588A - Attachment support device for crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the rigidity of a long-size attachment against a load without deteriorating assembling workability in an attachment support device for a crane. SOLUTION: The crane is formed into the structure that a long-size attachment 6 is provided at a front part of an upper structure 3 freely to be stood, a gantry 7 is provided at a rear part thereof, and a wire rope 8 to be delivered from a winch is provided on the structure 3 and wrapped around a sheave 11 of a bridle 10 through a sheave 9 provided at an upper end of the gantry 7, and the bridle 10 is locked with a tip of the long-size attachment 6 through a pendant rope 24. The attachment support device 23 provided with a tensile force distributing means (a tensile force distributing link 25) for distributing and transmitting the tensile force of the pendant rope 24 at an intermediate part of the pendant rope 24 and provided with a connecting member (an intermediate pendant rope 28) for connecting the ensile force distributing means and an intermediate part of the long-size attachment 6 to each other is provided for the crane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane attachment support device, and more particularly, to a crane provided with a long attachment, the crane attachment support device reducing the bending of the long attachment. It is about.

[0002]

2. Description of the Related Art A conventional attachment support device for a crane of this type will be described with reference to FIGS. In FIG. 10, reference numeral 1 denotes a crawler crane provided with a long attachment. The crawler crane 1 has an upper rotating body 3 mounted on a lower traveling body 2 so as to be freely rotatable. A long attachment 6 composed of an end attachment 4 and a tip attachment 5 is provided so as to be able to undulate, and a gantry 7 is provided at the rear, and is extended from a winch (not shown) installed on the upper swing body 3. A wire rope 8 is hung around a sheave 11 of a bridle 10 via a sheave 9 at an upper end of the gantry 7, and the bridle 10 is provided at a distal end of the long attachment 6 via a first pendant rope 12. The long attachment 6 is locked by the bracket 13 and performs the hoisting operation by the hoisting and unwinding operations of the wire rope 8. It is configured.

Further, a wire rope 14 fed from another winch (not shown) installed on the upper swing body 3 is wound around a sheave 15 provided at the upper end of the long attachment 6 to hook the hook 16. It is configured to be suspended.

Further, in order to reduce the bending of the long attachment 6, as shown in FIG.
Attachment support device 17 is provided integrally with
The attachment support device 17 is provided with brackets 19, 19 at both ends of a frame 18 of the bridle 10, and a support shaft 19 provided on the brackets 19, 19.
The middle portions of the balance arms 20 and 20 are swingably supported by the support arms a and 19a, respectively, and mounting holes 20a, 20a, 20a and 20a formed in both ends of the balance arms 20 and 20, respectively.
Among them, the first pendant ropes 12, 12 are attached to the inner attachment holes 20a, 20a, and the first pendant ropes 12, 12 are locked by the support bracket 13 provided on the distal end attachment 5.

Further, second pendant ropes 21 and 20 are provided in mounting holes 20a and 20a outside the balancing arms 20 and 20, respectively.
The second pendants 21 and 21 are locked to a support bracket 22 provided at the distal end of the base end attachment 4.

When the wire rope 8 is wound by the winch installed on the upper swing body 3, the first pendant ropes 12, 12 and the second
The pendant ropes 21 and 21 are pulled, and the long attachment 6 including the base end attachment 4 and the front end attachment 5 stands up.

At this time, tension is distributed to the first pendant ropes 12 and 12 and the second pendant ropes 21 and 21 by the equilibrium arms 20 and 20, and the distribution of the tension causes the distal end of the distal end attachment 5 to move. , The bending of the long attachment 6 can be suppressed, and the crawler crane can have a higher head and a larger working radius.

[0008]

In the above-mentioned conventional attachment support device for a crane, brackets are provided at both ends of a bridle frame, and the equilibrium arms are respectively pivotally supported on the brackets so as to be swingable. Thereby, tension is distributed to the first pendant rope and the second pendant rope, and the distribution of the tension reduces the tension applied to the distal end of the long attachment.

However, since the attachment supporting device has two equilibrium arms on the bridle, four supporting ropes are required. Conventionally, the attachment supporting device is mounted on a small crane that requires only two pendant ropes. In the case of application, four supporting ropes are required, and the assembling property is deteriorated.

Further, in the attachment support device, since the equilibrium arm is directly provided on the bridle and relatively long ropes are used for the first pendant rope and the second pendant rope, a load is applied to the tip of the long attachment. When the long attachment is deformed,
By making the angle between the restoring direction of the tip of the long attachment and the first pendant rope relatively large,
Since the restoring force of the distal end portion is small, that is, the rigidity of the long attachment against a load is low, the bending of the long attachment increases.

Therefore, in the attachment support device of the crane, there arises a technical problem to be solved in order to increase the rigidity of the long attachment against the load without deteriorating the assembly workability. The purpose is to solve this problem.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object. An elongated attachment is provided at the front of a revolving superstructure so as to be able to move up and down, and a gantry is provided at a rear. A wire rope fed from a winch installed on the upper revolving structure is wrapped around a bridle sheave via a sheave at the upper end of the gantry, and the bridle is engaged with a tip of the long attachment via a pendant rope. In the stopped crane, tension distributing means for distributing and transmitting the tension of the pendant rope is provided at an intermediate portion of the pendant rope, and the tension distributing means and the intermediate portion of the long attachment are connected to each other. A crane attachment supporting device provided with a connecting member to be connected, and the tension distributing means is a link The attachment support device of the crane, wherein the tension distribution means is a pulley, and the attachment support device of the crane, wherein the connecting member is a pendant rope, and the attachment support of the crane, wherein the connecting member is a link. An apparatus is provided.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of description, the same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 1, reference numeral 23 denotes an attachment support device of the present invention. The attachment support device 23 is an intermediate portion of a pendant rope 24 connecting the bridle 10 and the support bracket 13 provided on the distal end attachment 5 of the long attachment 6. A tension distribution link 25 as tension distribution means for distributing and transmitting the tension of the pendant rope 24 at a predetermined ratio.

The pendant rope 24 includes a main pendant rope 26 connecting the bridle 10 and the tension distribution link 25, and a tip pendant connecting the tension distribution link 25 and the support bracket 13 at the tip of the long attachment 6. Rope 27, support bracket 22 at the distal end of tension distribution link 25 and proximal end attachment 4
Pendant rope 2 as a connecting member connecting
As shown in FIG. 2, the main pendant rope 26 is pivotally attached to a mounting hole 25a formed in an intermediate portion of the tension distribution link 25, and is connected to the tip pendant rope 2 as shown in FIG.
7 is pivotally supported by a mounting hole 25b drilled at one end [the upper end in FIG. 2 (b)] of the tension distribution link 25, and the intermediate pendant rope 28 is connected to the tension distribution link 25.
Is pivotally supported by a mounting hole 25c formed in the other end (the lower end in FIG. 2B).

FIG. 2 shows the attachment supporting device 2.
3 shows a case in which the present invention is applied to a crane having two main pendant ropes 26, and FIG. 3 shows a case in which the attachment support device 23 is applied to a crane having four main pendant ropes 26. In any case, the attachment support device 23 is applicable.

As shown in FIG. 4, the tension distribution link 25 has a distance L1 between the center of the mounting hole 25a and the center of the mounting hole 25b, and a distance L1 between the center of the mounting hole 25a and the mounting hole 25a.
The tension can be appropriately distributed depending on the ratio to the distance L2 from the center c, and the tension of the main pendant rope 26 is T, the tension of the tip pendant rope 27 is T1, and the tension of the intermediate pendant rope 28 is T2. The following relationship holds: T1１T2 when L1 = L2 T2> T1 when L1> L2 T2 <T1 when L1 <L2 T = T1 + T2.

FIG. 5 shows the displacement and the restoring force with respect to the horizontal load on the back surface of the long attachment, and FIG.
Shows an attachment support device of a conventional example, and FIG.
Shows the attachment support device 23 of the present invention.

The figure shows a comparison of the restoring force when the long attachment makes the same displacement. In the conventional attachment support device, the first pendant rope is attached to the attachment support device integrated with the bridle. 12 and the second pendant rope 21 are locked.
A relatively long rope is used for the pendant rope 12 and the second pendant rope 21. On the other hand, in the attachment supporting device of the present invention, a tension distribution link is provided at an intermediate portion of the pendant rope 24, and the tip pendant rope 27 and the intermediate pendant rope 28 are locked to the tension distribution link. Each of the intermediate pendant ropes 28 is a relatively short rope.

Therefore, as described above, the attachment supporting device 23 of the present invention has a structure in which the end pendant rope 27 and the intermediate pendant rope 28 are short, and in particular, the intermediate pendant rope 28 is short, so that the end attachment 5 can be restored. The angle α between the direction and the tip pendant rope 27 can be reduced as compared with the conventional example,
Thus, when a horizontal load is applied to the distal end of the distal end attachment 5, a relatively large horizontal restoring force shown in the drawing is generated, and the horizontal rigidity can be increased. Also, although not shown, when a vertical load is applied to the distal end of the distal end attachment 5, a large vertical restoring force is generated as described above, and the vertical rigidity can be increased. Then, the bending of the long attachment 6 can be suppressed by the restoring force, so that it is possible to increase the head of the crane, increase the working radius, and the like.

Further, the attachment support device 23 of the present invention contributes to cost reduction because the intermediate pendant rope 28 is shortened.

FIG. 6 shows a case where the length of the long attachment 6 is shortened in accordance with the work by removing a part of the front end attachment 5, and in this case, the attachment support device 23 is used as it is. Can be.

FIG. 7 shows a case in which the work is performed by the base end attachment 4 with the distal end attachment 5 removed, or in the case of a small crane operating in the same state. In this case, The tension distribution link 25,
The work can be performed by removing the tip pendant rope 27 and the intermediate pendant rope 28 and locking the main pendant rope 26 to the support bracket 22 of the base end attachment 4. Therefore, in this case, two support ropes of only the main pendant rope 26 are used, and other support ropes are not required, and the tension distribution link 25 is not required, so that the assemblability is not deteriorated.

Further, even when the long attachment 6 is shortened or when only the base end attachment 4 is used, the work of changing the attachment support device 23 is easy.

FIG. 8 uses an intermediate support link 29 made of a steel plate or a steel pipe in place of the intermediate pendant rope 28.

In such a case, the same effect as that of the intermediate pendant rope 28 can be expected, and the intermediate support link 29 has an advantage that a material that is less expensive than the intermediate pendant rope 28 can be used. .

FIG. 9 uses a pulley 30 instead of the tension distribution link 25. In the case of the pulley 30, one pendant rope 31 is used in place of the tip pendant rope 27 and the intermediate pendant rope 28. At that time, the tension is equally distributed to both ends of the pendant rope 31.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0028]

According to the present invention, as described in detail in the above embodiment, the invention according to claim 1 is an attachment supporting device for a crane provided with a long attachment, wherein the pendant is provided at an intermediate portion of a pendant rope. The tension distributing means for distributing and transmitting the tension of the rope is provided, and a connecting member for connecting the tension distributing means and the intermediate portion of the long attachment is provided. The angle formed with the tip of the pendant rope can be reduced, thereby generating a large restoring force and increasing the rigidity in the horizontal and vertical directions. Then, the bending of the long attachment can be suppressed by the restoring force, so that the lifting height of the crane and the working radius can be increased.

Further, the connecting member is shortened, which contributes to cost reduction. In addition, when the attachment supporting device is used for a small crane, the distributing means is removed, and only two pendant ropes are used.
There is no deterioration in assemblability.

According to the second aspect of the invention, since the tension distribution means is a link, the tension distribution ratio can be freely selected in addition to the effect of the first aspect.

Further, according to the third aspect of the present invention, the same effect as the first aspect of the invention can be expected because the tension distribution means is a pulley.

Further, in the invention of claim 4, since the connecting member is a pendant rope, the same effect as the invention of claim 1, 2 or 3 can be expected.

Further, in the invention of claim 5, since the connecting member is a link, the same effect as the invention of claim 1 or 2 can be expected, and the link can be made of an inexpensive material. This is an invention that has a truly significant effect, such as contributing to cost reduction.

[Brief description of the drawings]

FIG. 1 is a front view of a crawler crane provided with a long attachment, showing one embodiment of the present invention.

FIG. 2A is a plan view showing an embodiment of the present invention and showing an attachment support device attached to a small crane. (B) The front view of the attachment support device attached to the small crane which shows one Embodiment of this invention.

FIG. 3A is a plan view of an attachment support device mounted on a large crane, showing one embodiment of the present invention. (B) The front view of the attachment support device attached to the large crane which shows one Embodiment of this invention.

FIG. 4 (a) is an explanatory view showing an embodiment of the present invention and showing tension distribution of an attachment support device. (B) An explanatory view showing the embodiment of the present invention and showing the interval length of the mounting holes of the tension distribution link.

FIG. 5A is an explanatory view showing a conventional example, showing horizontal displacement and restoring force on the back surface of a long attachment. (B) Explanatory drawing which shows one Embodiment of this invention and shows the horizontal displacement and the restoring force in the back surface of a long attachment.

FIG. 6 is an explanatory view showing another embodiment of the present invention and showing a state where a long attachment is shortened.

FIG. 7 is an explanatory view showing another embodiment of the present invention and showing a state where only a base end attachment is used as an attachment.

FIG. 8 shows another embodiment of the present invention, and is a front view of an attachment support device in which a connecting member is an intermediate support link.

FIG. 9A is a front view of an attachment supporting device according to another embodiment of the present invention, in which a tension distributing means is a pulley. (B) shows another embodiment of the present invention, and is a plan view of an attachment support device in which a tension distribution unit is a pulley.

FIG. 10 shows a conventional example, and is a front view of a crawler crane provided with a long attachment.

FIG. 11 is a plan view of an attachment supporting device, showing a conventional example.

[Explanation of symbols]

 2 Lower traveling structure 3 Upper revolving structure 6 Long attachment 7 Gantry 8 Wire rope 9, 11 Sheave 10 Bridle 23 Attachment support device 24 Pendant rope 30 Pulley

Claims (5)

[Claims] 1. A long attachment is provided at the front of the upper revolving structure so as to be able to move up and down, and a gantry is provided at a rear portion. In a crane in which a bridle is wrapped around a sheave of a bridle via a sheave and the bridle is locked to a distal end of the long attachment via a pendant rope, a tension of the pendant rope is applied to an intermediate portion of the pendant rope. An attachment supporting device for a crane, comprising: tension distributing means for distributing and transmitting the tension; and a connecting member for connecting the tension distributing means and an intermediate portion of the long attachment. 2. A crane attachment support device according to claim 1, wherein said tension distribution means is a link. 3. A crane attachment support device according to claim 1, wherein said tension distribution means is a pulley. 4. The attachment supporting device for a crane according to claim 1, wherein the connecting member is a pendant rope. 5. The attachment supporting device for a crane according to claim 1, wherein the connecting member is a link.