JPH027873B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a retractable crane, which is a multi-purpose retractable crane that enables four-point lifting of containers, and two-point lifting of buckets and hooks. Regarding.

[Background of the invention]

A retraction crane consists of a mast installed on a base, a main boom rotatably attached to the bottom of the mast, a top boom rotatably attached to the tip of the main boom and supporting the suspended load, and a A tension boom that pulls the other end toward the mat, a lifting device suspended by a hoisting rope wound around a sheave provided at the tip of the top boom, a drum that hoists the hoisting rope, and a main boom. It is equipped with a retraction device that performs extrusion and retraction. Such retractable cranes are disclosed in, for example, Japanese Patent Application Laid-Open No. 54-67955, Japanese Patent Application Laid-Open No. 54-122551,
This is clearly seen in Japanese Patent Application Laid-Open No. 55-35765.

The location from the rope to the hanging tool changes depending on the type of hanging tool.

There are four hanging points for hanging tools used to handle containers, and for buckets, there are two hanging points and one for opening and closing the bucket, for a total of three places, and for hooks, there are two.

Conventionally, when suspending a bucket or a hook, all the ropes are suspended from a sheave at the tip of the top boom, as in the above-mentioned publication.

When hoisting a container, as shown in Japanese Utility Model Application Publication No. 53-67261, a first link that projects horizontally toward the tip of the top boom is rotatably provided at the tip of the top boom, and the first link is attached to the tip of the main boom. Alternatively, connect the tip of the tension boom to the tip of the first link with a second link that protrudes beyond the connection point with the top boom, and connect the sheave at the tip of the top boom and the sheave at the tip of the link to the container. Hanging equipment.

When hanging a container, it has a first link and a second link, so when hanging a bucket or a hook, it is necessary to remove these two links.

As described above, when changing the hanging tool, it is necessary to attach and detach links, etc., and the replacement work is troublesome and extremely dangerous.

[Purpose of the invention]

An object of the present invention is to enable a hanging tool to easily change the hanging method.

[Summary of the invention]

The present invention comprises: a plurality of first sheaves provided on the tip side of the top boom; a link rotatably provided on the tip side of the top boom; A third sheave capable of supporting at least one rope suspended from the first sheave when rotated to the side, and a fourth sheave installed near the connection point between the main boom and the top boom. It is characterized by comprising a sheave and an operating device for rotating the link by operating a rope connected to the distal end side of the link via the fourth sheave.

[Embodiments of the invention]

Hereinafter, details of the present invention will be explained with reference to an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a rotating body mounted on a traveling body 2, which rotates on a horizontal plane. The following devices are mounted on the revolving body 1. 5 is a main boom, which is rotated by a retraction device 6. The retraction device 6 is attached to the mast 7. A top boom 8 is rotatably attached to the tip of the main boom 5.
The rear end of the top boom 8 and the mast 7 are connected by a tension boom 9. 10 is a counterweight.

As shown in FIGS. 1 to 6, sheaves 16, 17, 18, and 19, through which four ropes 15a, 15b, 15c, and 5d pass, are located at the side end of the mast 7 and at the rear end and tip of the top boom 8, respectively. It is provided. Sheaves 16, 17, 18, and 19 are each 4
Consists of two sheaves. Outer sheave 19a, 19
Ropes 15a and 15d passing through d are wound around a drum 21. Inner sheave 19b, 19
Ropes 15b and 15c passing through c are wound around a drum 22. A sheave 25 is suspended from the tip of the top boom 8 by a link 26, and is operated by a rope 28 of a drum 27. The drum 27 constitutes an operating device for changing the hanging point. The rope 28 is stretched along the main boom 5 and passes through the sheave 29 at the tip of the main boom 5 to the link 30.
is connected to. The link 30 is coaxially connected to the sheave 25. The sheaves 25 and 29 each consist of two pieces and are installed vertically below the ropes 15a and 15d. The drums 21, 22, 27 can each be operated independently. Drums 21 and 22 can be operated synchronously.

The structure around the sheave 25 at the tip of the top boom 8 will be explained with reference to FIGS. 7 and 11.
The following description will be made regarding the sheaves 19a and 19b, but the sheaves 19c and 19d have the same structure in principle. A link 26 is rotatably installed coaxially with the sheave 19 at the tip of the top boom 8. A sheave 25 and a link 30 are rotatably installed at the tip of the link 26. Sheave 2
5 and link 30 are coaxial. A rope 28 is connected to the tip of the link 30.

As shown in FIG. 11A, the link 26 is connected to the sheave 15.
It is attached to a shaft 31 on both sides of center point a. The link 26 has an H-shaped cross section.

As shown in FIG. 11D, the sheave 25 is located at the center of the link 26, and links 30 are located on both sides of the link 26.
is located. A plate 36 is inserted into the recess of the shaft 35 and fixed to the link 26 with bolts 37 to prevent rotation and movement of the shaft 35. The link 30 is made up of two plates, and the left and right plates are fixed together with bolts 41 via a spacer.

A roller 43 capable of supporting the rope 15a is provided on the upper surface side of the link 26. Although the roller 43 does not come into contact with the rope 15a or the sheave 26 during normal operation, it is installed close to the rope 15a and the sheave 26. Figure 11 C, D
As shown, the length L of the shaft 44 supporting the roller 43 is sufficiently longer than the width l of the link 30. Further, the roller 43 can fit inside the left and right plates of the link 30.

At the connecting ends of the ropes 15a, 15b, 15c, and 15d to the hanging tools, connecting fittings consisting of, for example, a clasp and a socket are provided. 1 in Figures 2 and 3
Reference numeral 5f indicates a portion connected to the bracket of the hanging tool of the spreader 50 or the bucket 51 via a pin. Sheave 52 for opening and closing the bucket 51 in Fig. 3
For the sheave 54 of the hook 53 in Fig. 4,
The connecting fittings of each rope 55 are connected by a rope 55. 15g shows this connection part. The connecting portion 15g is connected to the metal fittings of both ropes through pins.

12 to 14 show means for supporting the power supply cable 60 to the spreader 50. FIG. 1st
As shown in FIG. 3, the basket 61 of the spreader 50 is provided below the side surface of the boom 8 on the sheave 15a side. A power supply cable 60 is suspended from a platform 63 by a metal fitting 62. 64 is a connector. A platform 63 is a workplace for employees and is provided on the upper surface of the boom 8.
68 is a guide rail for the power supply cable 60;
It has a concave groove and a bracket 6 on the side of the boom 8.
It is installed with 9.70.

Cargo handling work in this configuration will be explained.

First, the ropes 15a, 15d are connected to the sheaves 19a,
It is suspended from 19d to sheaves 25a and 25b. In this case, the roller 43 is attached by passing it through the hole 48 of the link 26 as shown in FIG. 11B. Link 3
Connect the rope 28 to 0. Rope 15b, 15
c is suspended from the sheaves 19b and 19c.

When hanging the spreader 50 for a container, the rope 28 is wound up by the drum 27, and the ropes 15b and 15c are wound up by the drum 22 and stretched to such an extent that the spreader becomes horizontal. The drum 27 is fixed in that state. Since the sheave 25 is pulled by the rope 28, the ropes 15a and 15d
is suspended substantially parallel to the ropes 15b, 15c, and the spacing between the hanging points for four-point suspension can be maintained.

By operating the drums 21 and 22 in synchronization, the height of the spreader 50 can be adjusted.

By operating the retraction device 6, the spreader 50 is moved approximately horizontally. In this case, a sheave 29 is installed at the connection point between the top boom 8 and the main boom 5.
If provided, the spreader 50 will not tilt. However, since it is difficult to install the sheave 29 at the rotation center of the top boom 8, the rotation center 49 of the top boom 8 and the mounting position of the sheave 29 (provided on the top boom 8) are significantly different as shown in FIG. In this case, the spreader 50 tilts when the length of the rope 28 is constant. Adjust the sheave 29 so that the amount of inclination of the spreader 50 does not cause any actual damage.
Determine the mounting position. In other words, the position of the sheave 29 and drum 27 is such that the amount of inclination of the spreader 50 is not harmful to the standards of the length of the main boom 5, the length of the top boom 8, the length of the link 26, and the minimum rotation radius and maximum radius. Establish. Alternatively, the length of the rope 28 may be adjusted by operating the drum 27 or the like.

To attach the power supply cable 60, a rope is inserted from the platform 63 into the groove of the cable guide 68 and hung down, and the metal fitting 62 fixed to the upper end of the power supply cable 60 is connected and the rope is pulled up. The fitting 62 is then coupled to the platform and the connector 64 is coupled. The power supply cable 60 is inserted into the recessed groove of the cable guide 68. When removing the power supply cable 60, do the reverse.

According to this, since the power supply cable 60 hangs down along the cable guide 68, the top boom 8 can be moved from the state shown in FIG. 12 where the turning radius is the maximum to the state shown in FIG. 13 where the turning radius of the top boom 8 is the minimum. However, the power supply cable 60 hangs down inside the basket 61. If there is no cable guide 68, please use the basket 61
There may be cases where it does not fit inside. For example, if it is set to enter in the state shown in FIG. 12, it will not enter in the state shown in FIG. 14.

Next, the case where the bucket bag 51 and the hook 53 are hung will be explained. In this case, the rope 28 is sufficiently loosened using the drum 27 as shown in FIGS. 3 and 4. Then, the ropes 55 for the sheaves 52 and 54 are connected and connected to the hanging tool. Drums 21 and 22 are operated appropriately to adjust the length of rope 15 so that bucket 51 and hook 53 are horizontal. When the hanging tool is lifted, the sheave 25 moves to the outside of the sheave 19 as shown in FIGS. 9 and 10 due to the tension of the ropes 15a and 15d, and the rope 15
a and 15d hang vertically.

When the top boom 8 is set to the minimum radius, the 10th
As shown in the figure, the sheave 25 is located outside the center line P connecting the sheaves 18 and 19, so if the rope 28 is attached directly to the shaft 35 of the sheave 25, the rope 28 may come into contact with the sheaves 19a and 19d. , or get between the sheaves 19a, 19d and the top boom 8, damaging the rope 28.

For this reason, a link 30 is provided so that the rope 28 is located inside the sheave 19. However, the link 30 is pulled by the rope 28 and tends to become parallel to the link 26. The weight of the link 30 is lighter than the rope 28, and the weight between the drum 27 and the sheave 29 is lighter than that between the sheave 29 and the sheave 2.
This is because it is longer than 5 minutes. Therefore, the length L of the shaft 44 is made longer than the width l of the link 30 so that the link 30 does not touch the shaft 44 and become parallel to the link 26. As a result, the rope 28 is always located inside the sheave 19.

When the top boom 8 is extended from the inside to the outside (or vice versa) and stopped, the rope 15 is pulled from the sheave 25.
There is a possibility that a and 15b may come off, and the roller 43 prevents this. Since the shaft 44 of this roller 43 is also used as a stopper for positioning the link 30, the number of members can be reduced, making it lightweight and inexpensive.

As described above, since the sheave 25 for hanging at four points is operated by the rope 28, it is possible to change the hanging point extremely easily and safely when replacing the hanging tool. be.

In addition, a link 30 is provided between the sheave 25 and the rope 28, and a stopper (shaft 44) for adjusting the angle of this link 30 is provided on the link 26, so that when a bucket or a hook is hung, the rope 28
This prevents the sheave 19 from coming into contact with the sheave 19. Note that the link 30 does not need to be coaxial with the sheave 25. Further, as a stopper, a roller 70 may be provided protruding from the rope 28 side of the boom 8 as shown in FIG. 10 to prevent the rope 28 from coming into contact with the sheave 19. Of course, a stopper is necessary to prevent link 30 from being parallel to link 26.

Also, a roller 4 for preventing the stopper from coming off is provided.
Since it is also used as the shaft of No. 3, it can be made at low cost.

In the case of hanging from two points such as the hook 53, the sheave 25 can be pulled by the rope 28, and the ropes from the sheaves 19, 25 to the hanging tool (hook 53) can be arranged diagonally.

As the operating device for the sheave 25, in addition to the drum 27, a piston cylinder device or a screw rod device can be used. The sheave 29 may be attached to the main boom 5. The operating device for the sheave 25 can be attached to the top boom 8 or the in-boom 5 near the connection point between the top boom 8 and the main boom 5. Furthermore, it can also be installed closer to the tip of the top boom. In such cases, links can be used instead of ropes.

〔Effect of the invention〕

According to the present invention, it is possible to easily change the hanging method of the hanging tool simply by operating the operating device.

[Brief explanation of drawings]

The figures relate to one embodiment of the present invention, and Fig. 1 is an overall front view of a retractable crane, Fig. 2 is a perspective view showing the arrangement of ropes when suspending a spreader, and Fig. 3 is a diagram showing the arrangement of ropes when suspending a bucket. Figure 4 is a perspective view showing the arrangement of ropes, Figure 4 is a perspective view showing the arrangement of ropes when hanging a hook, Figure 5 is a front view of the area around the top boom, Figure 6 is a diagram showing the arrangement of the top boom sheave, Figure 7 is a front view of the tip of the top boom with the spreader suspended and the top boom set to the maximum radius. Figure 8 is a front view of the tip of the top boom with the spreader suspended and the top boom set to the minimum radius. Figure 9 is a front view of the tip of the top boom when the hook is suspended and the top boom is set to the maximum radius. Figure 10 is a front view of the tip of the top boom when the hook is suspended and the top boom is set to the minimum radius. Figure 11 is a sectional view taken along line A-B-C in Figure 7, Figures 12 and 13 are front views of the tip of the top boom showing the means for supporting the power supply cable, and Figure 14 is a longitudinal cross-section at the center of Figure 12. It is a front view. 2... Revolving body, 5... Main boom, 6... Retraction device, 7... Mast, 8... Top boom,
9...Tension boom, 15, 15a, 15
b, 15c, 15d... rope, 16, 17, 1
8, 19, 19a, 19b, 19c, 19d, 2
5, 29... Sheave, 21, 22, 27... Drum, 28... Rope, 43... Guide roller, 4
4... Axis, 50... Spreader, 51... Bucket, 53... Hook, 60... Power supply cable, 6
1...Basket, 63...Platform,
64...Connector, 68...Cable guide.

Claims (1)

[Scope of Claims] 1. A mast, a main boom rotatably attached to the mast, a top boom rotatably attached to the main boom, and a top boom rotatably attached between the rear end side of the top boom and the mast. A tension boom, a plurality of ropes for hanging hanging equipment, a drum that winds up the ropes through a first sheave at the leading end of the top boom and a second sheave at the rear end of the top boom, and a drum that rotates the main boom. A retractable crane equipped with a retracting device, a link rotatably provided on the tip side of the top boom, and a link provided on the tip side of the link, when the link is rotated downward of the top boom. a third sheave capable of supporting at least one rope suspended from the first sheave; a fourth sheave installed near the connection point between the main boom and the top boom; A retractable crane consisting of an operating device for rotating the link by operating a rope connected to the tip of the link via a sheave. 2. The retractable crane according to claim 1, characterized in that the fourth sheave is installed on the top boom. 3. The retractable crane according to claim 1, characterized in that the operating device is installed on the mast. 4. The retractable crane according to claim 3, characterized in that the operating device is installed at a lower part of the mast and closer to the rotation point of the main boom than the drum. 5 a mast, a main boom rotatably attached to the mast, a top boom rotatably attached to the main boom, a tension boom rotatably attached between the rear end of the top boom and the mast; A drum for winding the ropes through a first sheave at the leading end of the top boom and a second sheave at the rear end of the top boom, and a retracting device for rotating the main boom. In the retractable crane equipped with
The link is rotatably connected to the tip side of the first link, and when all the ropes are suspended downward from the first sheave, the first link is connected to the first link so as not to contact the first sheave. a second link capable of maintaining a predetermined angle with respect to the link of the top boom; A third sheave capable of supporting at least one rope suspended from the first sheave, and a third member connected to the distal end side of the second link, A retractable crane consisting of an operating device for rotating the link. 6 In claim 5, when all of the plurality of ropes are suspended downward from the tip of the first sheave by operating the operating device, the top boom is moved near the maximum rotation radius. 1. A retractable crane characterized in that the middle of the first link and the middle of the second link are in contact when the crane is turned and when the radius of rotation is near the minimum turning radius. 7 In claim 6, a roller for holding down the rope supported by the third sheave is provided on the first link, and the rotation axis of this roller is provided on the second link.
A retractable crane characterized in that the middle of the link protrudes in the axial direction so that it can be contacted.