JPH0228494A - retractable crane - Google Patents

Abstract

PURPOSE:To avoid the dangerous and troublesome work in replacing a suspension tool by allowing the suspension method of the tool to be easily changed only by operating an operating device, in a level luffing crane for four-point suspension or two-point suspension. CONSTITUTION:The sheaves 16, 17, 18 and 19 onto which four ropes pass are installed at the top edge of the side surface of a mast 7 and the rear edge and top edge a top boom 8. A sheave 25 is suspended from the top edge of the top boom 8 by a link, and operated by a rope 28 on a drum 27. When the link is pulled to the connection point side of the top boom 8 and a main boom 5 by operating an operating device, one among the ropes laid onto the first sheave at the top edge of the top boom 8 is suspended downward from the third sheave installed onto the link. Therefore, the rope suspended from the third sheave and the rope suspended from the first sheave can be obtained. When the operating device is operated reversely, all the ropes are suspended from the first sheave.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a retractable crane, which is a multi-purpose retractable crane that enables four-point suspension of objects such as containers, and two-point suspension of packets and hooks. It concerns cranes.

[Conventional technology]

A retractable 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 a suspended load, and two booms. A tension boom that pulls the other end of the top boom toward the mast, a lifting device that is suspended by a hoisting rope wound around a sheave installed at the tip of the top boom, and a drum that hoists the hoisting rope. It is equipped with a retraction device for pushing out and retracting the main boom. Such a retractable crane is disclosed, for example, in No. 551 and Japanese Patent Application Laid-Open No. 55-35765.

The hanging point from the robe to the hanging tool changes depending on the type of hanging tool.

There are 4 points for hanging tools for handling containers, and for packets, there are 2 points and 1 point for opening and closing the packet, for a total of 3 points, and for hooks, there are 2 points.

Conventionally, when hanging packets or hooks, all the lobes are hung from the sheave at the tip of the top boom, as in the above-mentioned publication.

When suspending 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 main boom Connect the tip of the sheave at the tip of the top boom or the tip of the sheave at the tip of the link with the tip of the link of 'Ml' with a second link, and connect the tip of the sheave at the tip of the top boom and the tip of the link with Hanging equipment for containers is hung from the sheave.

[Problem to be solved by the invention]

When hanging a container, it has a first link and a second link, so when hanging a packet 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 the links, making the replacement work troublesome and very dangerous.

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

[Means to solve the problem]

The present invention comprises: a plurality of first sheaves provided on the tip side of a top boom; a link rotatably provided on the tip side of the top boom; From the vicinity of the connection point between the main boom and the top boom and the third sheave, which can support at least one of the lobes suspended from the first sheave when the boom is rotated downward. and an operation it for rotating the link via the third member.

[For production]

When the link is pulled toward the connection point between the top boom and the main boom by operating the operating device, at least one of the lobes hung on the first sheave at the tip of the top boom is attached to the link. It is suspended downward from the third sheave. Therefore, a robe suspended from the third sheave and a robe suspended from the first sheave can be obtained. If you operate the operating device in the opposite direction, all the lobes will be ′! It is suspended from the sheave of Jl.

〔Example〕

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 the main boom, retract it! It is rotated by It6. 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 tensine boom 9. 10 is a counterweight.

As shown in FIGS. 1 to 6, four lobes 15 are provided at the end of the side of the mast 7 and the rear end and tip of the top boom 8.
The sheaves 16, 17 and 18, 19 through which a, 15b, 15c, and 15d pass are provided, respectively. Sheaves 16, 17° 18, 19 each consist of four sheaves. The lobes 15a and 15d passing through the outer sheaves 19a and L9d are wound around a drum.

Inner sheave 19b.

The lobes 15b and 15c passing through 19c are wound onto a drum n. 5 is a sheave suspended from the tip of the top boom 8 by a link 3, and is operated by a lobe Z of the drum I. The drum n constitutes an operating device for changing the hanging point. The lobe Z is stretched along the main boom 5, passes through the sheave 4 at the tip of the main boom 5, and is connected to the link (9). Link I is coaxially connected to sheave δ. Each sheave 6° consists of two, and the lobes 15
It is installed vertically below a and 15d. Drum 21.22
．． 27 can each be operated independently. The drums can be operated synchronously.

The configuration around the sheave 5 at the tip of the top boom 8 will be explained with reference to FIGS. 7 and 11. The following explanation will be about the sheaves 19a and 19b, but the sheave 19e
, 19d have the same structure in principle. A link 5 is rotatably installed coaxially with a sheave 19 at the tip of the top boom 8. A sheave 5 and a link chrysanthemum are rotatably installed at the tips of the links. Sheave δ and link beauty are coaxial. A rope field is connected to the tip of the link garden.

As in No. 11 (A), the links are attached to the shaft 31 on both sides of the sheave 15a.

The cross section of the link is H-shaped.

As shown in FIG. 11(D), the sheave 2 is located at the center of the link song, and the link circles are located on both sides of the link song. A plate is inserted into the recess of the shaft and fixed to the link with a bolt to prevent rotation and movement of the shaft. Link (9)
is made up of two plates, and the left and right plates are fixed together with bolts 41 via a spacer.

A roller 4 capable of supporting a rope 15g is provided on the upper surface side of the link I. Roller 4 has lobe 15 during normal operation.
Although it does not come into contact with A or Thieves, it is placed close to it. As shown in Figures 11 (C) and CD), the length L of the shaft 4 supporting the roller guide is sufficiently longer than the width l of the link. Also, Laura Xun can enter the inner chambers of the left and right boards of the link.

Rope 15a, 15b, 15c, 1
At the connecting end of 5d to the hanging tool, a connecting fitting made of, for example, a copter and a soubuto is provided. 1 in Figures 2 and 3
5f indicates a portion connected to the spreader (material) and the bracket of the hanger of the packet 51 via a bottle. Third
For the sheave 52 for opening and closing of the packet 51 shown in the figure and the sheave of the Fubuku paper shown in FIG. 4, the connecting fittings of each rope group are connected by a rope group. 15g indicates this connection. The connecting portion 15g is connected by passing a bottle through the metal fittings of both ropes.

FIGS. 12 to 14 show means for supporting the power supply cable to the spreader. 'fJi13 As shown in figure (the packet 61 of the spreader father is attached to the boom 8
It is located below the side of the The power supply cable symbol is suspended from the platform group by a metal shaft. 6 is a connector. The brat form rotor is a work area for conventional workers and is provided on the upper surface of the boom 8. The brocade is a guide rail for the power supply cable ω, has a concave groove, and is connected to the boom 8.
It is attached to the side with a bracket 69.70.

Cargo handling operations in a truck with such a structure will be explained.

First, the lobes 15a and 15d are suspended from the sheaves 19a and 19d to the sheaves 25a and 25b. in this case,
As shown in FIG. 11(B), pass it through the holes in link 5 and attach the roller. Connect the rope to the link (9). Ropes 15b and 15c are suspended from sheaves 19b and 19c.

When suspending a spreader for a container, the lobe 15b is rolled up with the drum n and the loaf 15b.

15c is rolled up with a drum n and pulled to such an extent that the spreader is horizontal. Drum n is fixed in that state. Because sheave 5 is being pulled with a rope. -P L5a,
The lobes 15d are suspended substantially parallel to the lobes 15b and 15c, and the distance between the hanging points for four-point suspension can be maintained.

By operating the drum force 22 in synchronism, the height of the spreader can be adjusted.

By operating the retracting device WL6, the spreader base is moved approximately horizontally. In this case, if a sheave is provided at the connection point between the top boom 8 and the main boom 5, the spreader head will not tilt.

However, since providing the sheave 9 at the center of rotation of the top boom 8 is separation, the top boom 8
rotation center 49 and mounting position of sheave 4 (top boom 8
If the lengths of the lobes are constant, the spreader will be inclined. Determine the mounting position of sheave 4 so that the amount of inclination of the spreader does not cause any actual damage. In other words, with respect to standards such as the length of the main boom 5, the length of the top boom 8, the length of the link 3, the minimum rotation radius, and the maximum rotation radius, the sheave 9 and determine the position of drum n. Alternatively, the length of the rope Z can be adjusted by driving the drum n or the like.

To install the power supply cable ω, connect the platform 63
Put the rope in the groove between the cable guides and let it hang down.
A metal fitting 62 fixed to the upper end side of the power supply cable ω is connected to pull up the rope. Then, the metal fitting 62 is connected to the platform, and the connector 6 is connected. The power supply cable ω is inserted into the concave groove of the cable guide field. To remove the power supply cable mark, do the reverse.

According to this, since the power supply cable ω hangs down along the cable guide, the state shown in FIG. 12 where the turning radius of the top boom 8 is at its maximum, and the state shown in FIG. 13 where the turning radius of the top boom 8 is set at its minimum. Even if it is moved, the power supply cable ω hangs down inside the basket 61. If there is no cable guide rug, the cable may not fit into the basket 61. 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 of hanging the packet 51 and the hook group will be explained. In this case, as shown in FIGS. 3 and 4, the drum I
Use to loosen rope Z sufficiently.

Then, the lobes of the sheaves 52 and 54M are combined and connected to the hanging tool. Drums 21 and 22 are operated appropriately to adjust the length of the rope so that the packet 51 and the hook field are level. When lifting with a hanging tool, ropes 15a, 15
FIG. 9 shows that the sheave 6 is moved by the tension of d.

As shown in FIG. 10, the ropes 15g and 15d are moved to the outside of the sheave 19 and suspended vertically.

When the top boom 8 is set to the minimum radius, the sheave δ is located outside the center line P connecting the sheaves 18 and 19, as shown in Figure 1O, so the rope is attached directly to the shaft of the sheave δ. and the lobe rows are sheaves 19a and 19d.
or in contact with the sheave 19a.

It got in between 19d and top boom 8.

Rope Z is damaged.

For this reason, a link blade is provided so that the rope Z is located inside the sheave 19.

However, the link blade is pulled by the rope row and tries to become parallel to the link. This is because the link blade weighs more than the rope, and the length of the drum is longer than four sheaves and five sheaves.

Therefore, the length L of the shaft material is made longer than the width l of the link (9) so that the link blade does not touch the axis I and run parallel to the link 3. This causes the rope row to become sheave 1.
It is always located inside 9.

If the top boom 8 is extended from the inside to the outside (or vice versa) and stopped, the ropes 15a and 15d may come off the sheave 5, and the rollers 4 prevent this. Since the shaft material of the roller 0 is also used as a stopper for positioning the link (9), the number of members can be reduced and the construction can be made lightweight and inexpensive.

As mentioned above, set the sheave 5 for hanging at 4 points in low)28
Since the suspension point is operated by the operator, it is possible to change the suspension point extremely easily and safely when replacing the suspension tool.

In addition, a link □□□ is provided between the sheave 5 and the lobe, and a stopper (shaft 44) is provided for adjusting the angle of this link blade.
Since it is provided on the link, it is possible to prevent the rope Z from coming into contact with the sheave 19 when a packet or a hook is hung. Note that the link blade does not need to be coaxial with the sheave 5. Further, as a stopper, a roller 70 is provided protruding from the lobe Z side of the boom 8 as shown in FIG.
It is also conceivable to prevent the rope β from coming into contact with the sheave 19. Of course, a stopper is necessary to prevent link (to) from becoming parallel to link (b).

Further, since the stopper is also used as the shaft of the roller 4 for preventing slippage, the cost can be reduced.

In the case of two-point hanging such as a hook field, the sheave 3 can be pulled by a rope Z, 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 5, in addition to the drum n, a piston cylinder device or a screw rope device can be used. Sheave 4 may be attached to main boom 5.

This operating device for the sheave 5 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 a case, links can be used instead of lobes.

〔Effect of the invention〕

According to the present invention, the way the hanging tool is hung can be easily changed by simply operating the operating device.

[Brief explanation of the drawing]

The figures relate to one embodiment of the present invention, and Figure East 1 is an overall front view of the retracting crane, Figure N2 is a perspective view showing the arrangement of lobes when hanging a spreader, and Figure 3 is a lobes when hanging a packet. Figure 4 is a perspective view showing the arrangement of the lobes when hanging the 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 when the spreader is suspended and the top boom is set to the maximum radius. Figure 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. Figure 9 is a front view of the tip of the top boom when the hook is hung and the top boom is at its maximum radius.
Figure 0 is a front view of the tip of the top boom when the hook is hung 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 1
FIG. 3 is a front view of the tip of the top boom showing the support means for the power supply cable, and FIG. 14 is a longitudinal cross-sectional view of the center of FIG. 12. 2... Swivel body, 5... Main boom,
6... Bowing device, 7... Mast, 8
......Top boom, 9...Tensile boom, 15, 15 a, 15 b, 15
c. 15 d -------o-b, 16. 17. 18
．． 19. 19a, 19b. 19 c, 19 d, 25, 29---
- Sheave, drum for 21.22.27-, Z...
...Lobe, 4...Guide roller, required...
...Axis, Seki...Packet, Phantom...Hook, ω...Power cable, 61...Basket, Mortar...Brabut form , θ...
...Connector, brocade...Cable guy l Flashing diagram O δ Figure I lθ Figure 112 Figure O/J Figure

Claims (1)

[Claims] 1. A mast, a main boom rotatably attached to the mast, a top boom rotatably attached to the main boom, and a rotatable structure between the rear end of the top boom and the mast. A tension boom that is freely attached, a plurality of ropes from which hanging equipment is hung, a drum that winds 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 main boom. A retraction crane equipped with a retraction device that rotates the top boom, a link rotatably provided on the tip side of the top boom, and a link installed on the tip side of the link, with the link attached to the lower side of the top boom. A third sheave capable of supporting at least one rope suspended from the first sheave when rotated, and a third member from 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 using the link.