JPH04213590A - Level luffing crane - Google Patents

Abstract

PURPOSE:To enable a crane lifting point to be easily changed in the level luffing crane where a load lifting is selected between four-point lifting for a container and two-point lifting for a bucket and a hook. CONSTITUTION:The end of a top boom 8 is so fitted with a link as to be freely rotatable, and a sheave 25 is fitted to the end of the aforesaid link. A rope 28 with one end connected to the end of the link has the other end connected to a drum 27 installed at the root of a mast via a sheave 29 located near the connection point of the top boom 8 and a main boom. When the rope 28 is wound about the drum 27, the link is pulled and the desired rope 15 of ropes 15 extended along a sheave 19 is thereby pulled. As a result, four-point lifting is obtained. Two-point lifting can be obtained by slackening the rope 28.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a retractable crane.
This invention relates to a multi-purpose retractable crane that enables four-point lifting of objects such as containers, and two-point lifting of objects such as buckets and hooks.

0002

[Prior Art] A retractable crane has a mast installed on a base, a main boom rotatably attached to the lower part of the mast, and a main boom rotatably attached to the tip of the main boom to support a suspended load. A top boom, a tension boom that pulls the other end of the top boom toward the mat, a hoisting device that is suspended by a hoisting rope wound around a sheave installed at the tip of the top boom, and a hoisting rope that hoists the hoisting rope. It is equipped with a retraction device for pushing out and retracting the drum and main boom. Such a retractable crane is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 54-67955 and 1977-122.
No. 551, Japanese Unexamined Patent Publication No. 55-35765, etc.

[0003] The hanging point from the rope to the hanging tool varies depending on the type of hanging tool.

[0004] Hanging tools for handling containers have four hanging points, and buckets have two hanging points and one for opening and closing the bucket, a total of three points, and hooks have two hanging points.
There are several places.

Conventionally, when hanging buckets or hooks,
As in the above publication, all the ropes are suspended from the sheave at the tip of the top boom.

[0006] When hanging containers,
As shown in Publication No. 7261, a first link projecting horizontally toward the tip of the top boom is rotatably provided at the tip of the top boom, and the tip of the main boom or the tip of the tension boom is connected to the top boom. The part projected beyond the connection point and the tip of the first link are connected by a second link, and a hanging tool for the container is suspended from the sheave at the tip of the top boom and the sheave at the tip of the link.

[0007]

[Problem to be solved by the invention] The above-mentioned Utility Model Application No. 53-67
Since the retractable crane of Publication No. 261 has a first link and a second link for hanging a container, it is necessary to remove these two links when hanging a bucket or a hook.

[0008] As described above, when changing the hanging tool, it is necessary to attach and detach links and the like, which makes the replacement work troublesome and, moreover, very dangerous because the work is done at a high place.

An object of the present invention is to make it possible to easily change the way the hanger is hung.

0010

[Means for Solving the Problems] The present invention includes a first link rotatably provided on the tip side of a top boom, and a second link rotatably connected to the tip side of the first link. link, and is installed on the tip side of the second link, and the first
When the link and the second link are rotated to the lower side of the top boom, the first link at the tip of the top boom
a third sheave capable of supporting at least one rope suspended from the sheave; and the second link via a flexible member connected to the distal end side of the second link. and when all the ropes are suspended downward from the first sheave by operating the operating device installed on the mast, the second link or the the second sheave relative to the first link such that the flexible member does not contact the first sheave;
and a holding means for holding the link at a predetermined angle.

[0011]

[Operation] When the operating device is operated, the flexible member and the second
The first link rotates through the link. When the flexible member is pulled using the operating device, the first link is pulled through the second link so that the first link is located below the top boom. At this time, the third sheave installed on the first link suspends at least one rope from the lower side of the top boom. When the flexible member is returned using the operating device, the first link returns to the tip side of the top boom;
All ropes hang vertically from the first sheave at the tip of the top boom. As described above, the hanging point can be easily changed by operating the operating device. When all the ropes are suspended vertically from the first sheave and the top boom is set close to the minimum radius, the second link connected to the tip side of the first link is connected to the first link. By maintaining a predetermined angle with respect to the link, it is possible to prevent the second link or flexible member from contacting the first sheave.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below 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, a sheave 16, through which four ropes 15a, 15b, 15c, and 15d pass, is located at the end of the side of the mast 7, and at the rear end and tip of the top boom 8.
17, 18, and 19 are provided, respectively. Sheave 16,
17, 18, and 19 each consist of four sheaves. Ropes 15a, 15d passing through outer sheaves 19a, 19d
is wound onto a drum 21. inner sheave 1
The ropes 15b and 15c passing through the ropes 9b and 19c are connected to the drum 22.
I try to wind it up. 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 is attached to a sheave 29 at the tip of the main boom 5.
It is connected to the link 30 through. 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, 11, and 12. 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 25 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 attached to the shaft 31 on both sides of the sheave 15a. The link 26 has an H-shaped cross section.

As shown in FIG. 12, the sheave 25 is located at the center of the link 26, and the links 30 are located on both sides of the link 26. Insert the plate 36 into the recess of the shaft 35 and connect the link 26.
The shaft 35 is fixed with a bolt 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,
They are located close together. As shown in FIGS. 11(C) and 12, 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.

[0019] At the ends of the ropes 15a, 15b, 15c, and 15d connected to the hanging tools, connecting fittings consisting of, for example, a cotter and a socket are provided. Reference numeral 15f in FIGS. 2 and 3 indicates a portion connected to the bracket of the hanger of the spreader 50 and the bucket 51 via a pin. For the sheave 52 for opening and closing the bucket 51 in FIG. 3 and the sheave 54 for the hook 53 in FIG.
Connected by 5. 15g shows this connection part. The connecting portion 15g is connected to the metal fittings of both ropes through pins.

13 to 15 show means for supporting the power supply cable 60 to the spreader 50. FIG. As shown in FIG. 14, 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. Platform 6
3 is an employee's work area, which is provided on the upper surface of the boom 8. 68 is a guide rail for the power supply cable 60;
Brackets 69, 7 are provided on the sides of the boom 8 with grooves in a concave shape.
It is installed at 0.

[0021] Cargo handling work in this configuration will be explained.

First, the ropes 15a and 15d are connected to the sheave 19.
It is suspended from a and 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. 11(B). Rope 2 to link 30
Connect 8. Ropes 15b, 15c are sheave 19b,
Hang it from 19c.

When suspending the spreader 50 for a container, the rope 28 is wound up by the drum 27, and the ropes 15b, 15c are wound up by the drum 22 and pulled 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 are suspended substantially parallel to the ropes 15b and 15c, and the distance between the hanging points for four-point suspension can be maintained.

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

By operating the drawing device 6, the spreader 5
0 is moved approximately horizontally. Since it is difficult to install the sheave 29 at the center of rotation of the top boom 8,
If 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 the figure, the spreader 50 will tilt if the length of the rope 28 is constant. The mounting position of the sheave 29 is determined so that the amount of inclination of the spreader 50 does not cause any actual damage. In other words, the length of the main boom 5, the length of the top boom 8, and the length of the link 26.
The sheave 29 is adjusted so that the amount of inclination of the spreader 50 is adjusted to the extent that no actual damage occurs with respect to the length, minimum rotation radius, and maximum radius standards.
and determine the position of the drum 27. Alternatively, the length of the rope 28 may be adjusted by operating the drum 27 or the like.

To explain this in some detail, in order to horizontally move the spreader 50 when suspended at four points,
As is clear from FIGS. 1, 5, 7, and 8, it is necessary that the inclination angle of the link 26 with respect to the horizontal plane remains the same even if the elevation angle of the main boom 5 changes. In other words,
As the elevation angle of the main boom 5 changes, the inclination angle of the link 26 with respect to the top boom 8 must change. As is clear from the comparison between FIG. 1 and FIG. 5, and between FIG. 7 and FIG. 8, as the rising angle of the main boom 5 increases, the rising angle of the top boom 8 also increases (see FIG.
imaginary line, Fig. 5, Fig. 8). As is clear from the comparison between Figures 7 and 8, the main boom 5 (top boom 8
) increases, the inclination angle of the link 26 with respect to the top boom 8 (the angle formed by the top boom 8 and the link 26 with the rollers 43 in between) must increase.

Now, as is clear from FIG.
The position of the drum 27, which is a fixed position at one end of the main boom 8, is located on the opposite side of the main boom 5 from the rotation point of the up-and-down movement of the main boom 5 (the connection point between the main boom 5 and the lower part of the mast 7). Because of this positional relationship, the distance from the drum 27 to the sheave 29 near the shaft 49 changes as the main boom 5 rises and falls. Now, when the rising angle of the main boom 5 (top boom 8) changes from a small state to a large state, the distance becomes smaller. For this reason, the rope 28 is attached to the mast 7
It is fed out from the side to the link 26 side. The amount of this payout is generally determined by the position of the drum 27 relative to the pivot point. Therefore, as shown in FIG. 8, the angle of the link 26 with respect to the top boom 8 increases, and the spreader 50 moves horizontally.

Furthermore, since the sheave 29 is installed on the top boom 8 in the vicinity of the shaft 49 (connection point) and at a different position from the connection point, the sheave 29 is installed on the top boom 8 at a position different from the connection point.
) changes from a small state to a large state, the position of the sheave 29 changes from the connection point between the top boom 8 and the main boom 5 (shaft 4
9). That is, the vertical distance between the connection point (shaft 49) and the sheave 29 becomes smaller. Therefore, the rope 28 is let out to the link 26 side. This amount of payout is generally determined by the connection point (shaft 49).
It is determined by the position of the sheave 29 relative to the position of the sheave 29. Therefore, also with this configuration, the angle of the link 26 with respect to the top boom 8 increases as shown in FIG. 8, and the spreader 50 moves horizontally.

To attach the power supply cable 60, a rope is suspended from the platform 63 into the groove of the cable guide 68, and the metal fitting 62 fixed to the upper end of the power supply cable 60 is connected and the rope is pulled up. and metal fittings 62
is coupled to the platform and 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
Even when the top boom 8 is moved from the state shown in FIG. 13 where the turning radius is at its maximum to the state shown in FIG. If there is no cable guide 68,
There may be cases where it does not fit into the basket 61. For example, Figure 1
If it is set to enter in state 2, it will not enter in the state shown in Fig. 15.

Next, the case of hanging the bucket 51 and the hook 53 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. Operate the drums 21 and 22 appropriately and adjust the rope 1 so that the bucket 51 and hook 53 are horizontal.
Adjust the length of 5. When the hanging tool is lifted, the rope 15a,
Due to the tension of 15d, the sheave 25 moves to the outside of the sheave 19 as shown in FIGS. 9 and 10, and the ropes 15a and 15d
hangs vertically.

When the top boom 8 is set to the minimum radius, the sheave 25 is located outside the center line P connecting the sheaves 18 and 19, as shown in FIG. When installed, the rope 28 may come into contact with the sheaves 19a, 19d, or the sheaves 19a, 19
d and the top boom 8, and the rope 2
8 is damaged.

[0033] For this reason, a link 30 is provided to connect the rope 2.
8 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. This is because the weight of the link 30 is lighter than the rope 28, and the distance between the drum 27 and the sheave 29 is longer than the distance between the sheave 29 and the sheave 25. 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 ropes 15a,
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, sheave 2 for hanging at four points
5 is operated by the rope 28,
This allows the hanging point to be changed extremely easily and safely when replacing the hanging tool.

Also, means for horizontally moving the spreader 50 when suspended at four points (links 26, 30, rope 28
, sheaves 19, 25, etc.) and a drum 27 for changing the hanging point, the structure can be simplified.

Furthermore, since one fixed end of the rope 28 (the position at which the rope 28 is fed out from the drum 27) is located at the mast 7, the fixed point for horizontal movement can be selected from the large mast 7. It is possible to easily select a fixed point with high precision. Also, drum 2
Since the installation position of the drum 27 is the mast 7, problems due to the weight of the drum 27 do not occur as compared to other parts (for example, the main boom).

Furthermore, 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 hook is hung, This can prevent the rope 28 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, it is also possible to provide a roller 70 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 link 3
A stopper is necessary to prevent 0 from being parallel to link 26.

Furthermore, since the stopper is also used as the shaft of the roller 43 for preventing slippage, the cost can be reduced.

[0040] When hanging from two points such as hook 53, sheave 2
5 with a rope 28, and the ropes from the sheaves 19, 25 to the hanging tool (hook 53) can be arranged diagonally. According to this, as is well known, there is an effect of preventing the hanging tool from swinging.

As an operating device for the sheave 25, the drum 2
7, a piston cylinder device or a screw rod device can be used. Sheave 29 is main boom 5
It may be installed on. The operating device for the sheave 25 can be attached to the top boom 8 or the main 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.

[0042]

According to the present invention, it is possible to easily change the hanging method of the hanger simply by operating the operating device, and the configuration thereof can be simplified. Further, another link is interposed between the link having the sheave and the flexible member (for example, the rope 28) operated by the operating device, and the two links are provided so as to maintain a predetermined angle. Therefore, when all the ropes are suspended vertically from the tip of the top boom and the top boom is set to its minimum radius, the flexible member or the other link may This can prevent contact with the sheave at the tip.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of a retractable crane according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the arrangement of ropes when suspending a spreader in the retraction crane of FIG. 1;

FIG. 3 is a perspective view showing the arrangement of ropes when hanging a bucket in the retractable crane of FIG. 1;

FIG. 4 is a perspective view showing the arrangement of ropes when hanging hooks in the retractable crane of FIG. 1;

5 is a front view of the vicinity of the top boom of the retractable crane shown in FIG. 1. FIG.

6 is a diagram showing the arrangement of sheaves of the top boom of the retraction crane of FIG. 1; FIG.

7 is a front view of the tip of the top boom when the spreader is suspended and the top boom is at its maximum radius in the retractable crane of FIG. 1; FIG.

8 is a front view of the tip of the top boom when the spreader is suspended and the top boom is set to the minimum radius in the retractable crane of FIG. 1; FIG.

9 is a front view of the tip of the top boom when the hook is suspended in the retractable crane of FIG. 1 and the top boom is set to the maximum radius; FIG.

10 is a front view of the tip of the top boom when the hook is suspended in the retractable crane of FIG. 1 and the top boom is set to the minimum radius; FIG.

11 is a cross-sectional view taken along line AA in FIG. 7. FIG.

12 is a sectional view taken along line CC in FIG. 7. FIG.

13 is a front view of the tip of the top boom showing support means for the power supply cable in the retractable crane of FIG. 1; FIG.

14 is a front view of the tip of the top boom showing support means for the power supply cable in the retractable crane of FIG. 1; FIG.

FIG. 15 is a central vertical cross-sectional view of FIG. 12;

[Explanation of symbols]

2... Revolving body, 5... Main boom, 6... Retraction device, 7...
Mast, 8...Top boom, 9...Tension boom, 1
5, 15a, 15b, 15c, 15d...rope, 16,
17, 18, 19, 19a, 19b, 19c, 19d,
25, 29... Sheave, 21, 22, 27... Drum, 26
, 30... Link, 28... Rope, 43... Guide roller,
44...shaft, 50...spreader, 51...bucket, 53...
Hook, 60... Power supply cable, 61... Basket, 62
...Metal fitting, 63...Platform, 64...Connector, 6
8...Cable guide.

Claims (3)

[Claims] 1. a mast, a main boom rotatably attached to the mast, a top boom rotatably attached to the main boom, and rotatably attached between the rear end side of the top boom and the mast. A tension boom, a plurality of ropes for hanging hanging tools, 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 thereof, and a drum for rotating the main boom. a retraction device that moves the
A retractable crane equipped with a first link rotatably provided on the tip side of the top boom, a second link rotatably connected to the tip side of the first link,
The rope is installed on the tip side of the second link, and is suspended from the first sheave when the first link and the second link are rotated to the lower side of the top boom. A third part that can support at least one of the
The second link is rotated via a sheave and a flexible member connected to the distal end side of the second link, and an operating device installed on the mast and an operating device of the operating device When all of the ropes are suspended downward from the first sheave by operation, the first link is arranged so that the second link or the flexible member does not come into contact with the first sheave. holding means for holding the second link at a predetermined angle relative to the retractable crane. 2. In claim 1, the holding means comprises:
When all the ropes are suspended downward from the tip of the first sheave by operating the operating device, and when the top boom is near the minimum rotation radius, the first link A retractable crane characterized in that the intermediate portion and the intermediate portion of the second link are configured to be in contact with each other. 3. In claim 2, the holding means holds down the rope supported by the third sheave, and the holding means holds down the rope supported by the third sheave, and the holding means holds down the rope supported by the third sheave, and the holding means holds down the rope supported by the third sheave, and
and a shaft of the roller protruding in the axial direction so as to be able to contact the middle of the link.