JPS5815433Y2 - Mobile crane lattice boom - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lattice boom for a mobile crane, and more specifically, it is composed of a lower boom, an upper boom, and an arbitrary number of joint booms inserted between both booms. The present invention relates to a lattice boom for a mobile crane, which can have a boom length, the entire boom is attached to a crane body so as to be able to raise and lower, and is supported by a pendant rope for raising and lowering the boom connected to the tip of the boom.

Figure 1 shows the operating status of a mobile crane equipped with a conventional lattice boom, where 1 is the crane body, 2 is the lattice boom,
3 shows a pendant rope for raising and lowering the boom.

The lattice boom 2 is a lower boom 2a. It is composed of two connecting booms 2b and 2c and an upper boom 2d, and a lower boom 2a is attached to the crane body 1 so as to be able to raise and lower.

Further, the lower boom 2a, joint boom 2bt2c, and upper boom 2d of the lattice boom 2 can be disassembled and assembled, respectively.

And joint boom 2b. By inserting an equivalent number of connecting booms in addition to 2c, it is possible to obtain any boom length necessary for the work, including the longest boom length, and by removing the connecting boom 2c, it is possible to obtain the shortest boom length that can be used for work. can do.

The pendant rope 3 is connected to the boss 4 at the tip of the lattice boom 2, that is, the tip of the upper boom 2d, and supports the entire lattice boom 2 by lobe tension when a load is lifted by the hook 5.

The lattice boom 2 is raised and lowered by winding and letting out the elevating rope 6.

In addition, the pendant lobe 3 is cut from a rope whose length basically corresponds to the sum of the length of the lower boom 2a and the length of the upper boom 2d, and one spliced boom is inserted. 1 corresponding to the length of the splicing boom
A pendant rope is added to the book.

By the way, in the case of lattice booms used in mobile cranes, on the condition that the shortest boom length of only the lower boom and upper boom does not exceed the vehicle length limit during transportation.
Since the length of each boom is set, the total boom length of such booms is short, so the working range (the range in which loads can be lifted and moved to different locations) becomes narrow, making it impossible to obtain a practical working range.

Therefore, in general, work is carried out by inserting one to several connecting booms between the lower boom and the upper boom to obtain the optimum boom length (length that provides a practical working range).

That is, in the illustrated example, two connecting booms 2b and 2c are inserted between the lower boom 2a and the lower boom 2d to obtain the optimum boom length LB.

Several types of optimal boom lengths are selected depending on the work depending on the selection relationship between the maximum lifting load and the maximum work radius.

When the lattice boom 2 is made to have the optimum boom length LB by adding the joint booms 2 b and 2 c, a pendant rope with a length corresponding to the length of the double joint booms 2 b * 2 c is added and used.

If the boom length of lattice boom 2 is further increased,
Similar to the above, the splicing boom and pendant rope are further tightened.

On the other hand, when a mobile crane equipped with the lattice boom is mounted on a transport vehicle and transported on general roads, if the lattice boom is set to the optimum boom length LB, the vehicle length limit will be exceeded. Connecting boom 2 as shown in
Remove b t 2 c and each additional pendant rope.

Then, connect the upper boom 2d directly to the tip of the lower boom 2a to shorten the total length of the lattice boom, and reconnect the pendant rope 3 to the boss 4 at the tip of the upper boom 2d to shorten the total length of the mobile crane. It is below the vehicle limit.

However, in conventional lattice booms, when transferring from a working position to a transport position, the entire splicing boom and each splicing pentan rope must be removed.

Therefore, the longer the length of the boom during operation, the more time and effort is required to disassemble and assemble the splicing boom and the splicing pendant rope.

Another drawback is that when there are a large number of splicing booms and splicing pendant ropes, a large number of transport vehicles are required to transport them separately.

The purpose of the present invention is that when the optimum boom length LB is reached, it is possible to move from the working position to the transport position without removing the joint boom, and when the boom length is greater than the optimum boom length LB, the joint boom length is greater than the optimum boom length LB. To provide a lattice boom for a mobile crane which can be moved to a transportation position by simply removing the boom and a pendant rope for addition, and which can reduce time and labor in disassembling and assembling.

In order to achieve this purpose, the present invention has a lower boom that is attached to the crane body so that it can be raised and lowered, at least one joint boom, and an upper boom that are arranged so that the optimum boom length can be obtained depending on the work. Select the length, divide the joint boom in the middle, connect each other with a connecting pin, and remove one connecting pin to separate the upper tip side boom from the split part using the other connecting pin as a fulcrum. a joint means for folding the proximal boom downward from the bottom to one side of the proximal boom; and a locking means for locking both booms in the folded position; The proximal end boom is supported when the distal end boom is folded by anchoring a boom elevating pendant rope or priddle to the section.

Hereinafter, one embodiment of the lattice boom of the present invention will be described with reference to FIGS. 3 to 6.

In the figure, 11 is a crane body of a crawler type mobile crane, 12 is a lattice boom of the present invention, 13 is a pendant rope, 14 is an elevating rope, and 15 is a priddle.

In this example, the lattice boom 12 includes a lower boom 12a, two joint booms 12b and 12c, and an upper boom 1.
2d, and the lower boom 12a is attached to the crane body 11 via a pin 16 so that it can be raised and lowered, so that the entire boom can be raised and lowered.

The length of each boom is selected to be the optimum boom length LB depending on the work when connected to each other.

Furthermore, the joint boom 12c is divided into two parts approximately in the middle thereof, and at the divided part, the tip side boom (the upper boom 12d and the divided boom 12'c connected to the upper boom 12d in the joint boom 12c) can be folded to the - side of the proximal boom (the lower boom 12a, the split boom 12"C connected to the link boom 12b of the link boom 12b, and the link boom 12c).

That is, the joint means has the following structure.

On both sides of the split boom 12''C in the joint boom 12c, fork ends 17a are separated from the sides of the boom and have pin holes at hole positions.

Eye ends 18a and 18b having pin holes having the same diameter as the pin holes of the fork ends 17a and 17c are attached to both sides of the split boom 12'c.

One fork end 17a and eye end 18
A connecting pin 19 for rotation is inserted into the pin hole a, and connecting pins 20 for attachment and detachment are inserted through the pin holes of the other fork end 17b and the eye end 18b, respectively, so that the pool 1 on both sides is inserted.
2'c and 12'c are connected.

By removing the attaching/detachable connecting pin 20, the distal end boom can be rotated about the rotating connecting pin 19 as a fulcrum as shown in the imaginary line, and folded to one side of the proximal boom.

Further, the following locking means for locking both booms in the folded position is provided.

A fork-shaped bracket 21 having a pin hole is provided at the location of the split boom 12''C in the joint boom 12cVc, and the fork-shaped bracket 21 is provided on the side of the split boom 12'c.
Eye-shaped bracket 2 having a pin hole with the same diameter as the pin hole in item 1
2 is attached and the distal boom is folded, the distal boom can be locked to the proximal boom by inserting the connecting pin 23 into the pin holes of both brackets 21 and 22. It is now possible to do so.

The length of the proximal boom tl and the length of the distal boom t2
is selected to have a relationship of 11>12.

Further, the length tl of the proximal boom is selected to be such that the total length of the mobile crane does not exceed the vehicle length limit when the distal end boom is folded and the lattice boom 12 itself is placed in the transportation position.

Furthermore, a lattice boom 12 is provided at the tip of the proximal boom, that is, at the tip of the split boom 12''C in the joint boom 12c.
A boss 24 that locks the pendant rope 13 is attached when the lattice boom 12 assumes the transport position, and when the lattice boom 12 assumes the transport position shown in FIG. 4, the proximal boom is supported by the pendant rope 13. .

During operation, the pendant rope 13 is tied to the boss 25 at the tip of the lattice boom 12, that is, the tip of the upper boom 12d, and when lifting a load with the hook 26, the entire lattice boom 12 is supported by rope tension.

Further, the lattice spring 12 is raised and lowered by winding and letting out the elevation rope 140.

Since the lattice spring of the present invention is constructed as described above, in order to move from the working position with the optimum boob length LB to the transporting position,
The entire lattice boom 12 is lowered, its tip is grounded, the pendant rope 13 is removed from the boss 25 at the tip of the upper boom 12d, and it is tied to the boss 24 at the tip of the split boom 12#c in the joint boom 12c.

Thereafter, the entire lattice boom 12 is extended to a substantially horizontal position, the attachment/detachment connecting pin 20 shown in FIG. Fold.

Both side pools 12''c, 12 in the joint boom 12e
Insert the connecting pins 23 into brackets 21 and 22 of 'c' to lock the distal end boom to the proximal boom.

As a result, as shown in FIG. 4, the total length of the mobile crane becomes less than the vehicle length limit, and the mobile crane can be mounted on a transport vehicle and transported on public roads.

In addition, in order to move from the transportation position to the working position, the operation opposite to the above may be performed.

Incidentally, when performing the above-described operation of extending the lattice spring 12 from the folded state, the proximal boom is tilted slightly downward from the horizontal position with the attachment/detachment connecting pin 20 removed.

As a result, a rotational moment acts on the distal end boom due to its own weight, and the distal boom rotates forward of the proximal boom using the rotation connecting pin 19 as a fulcrum, so that the distal boom can be easily extended.

When folding the lattice boom, the proximal boom is disengaged from the proximal boom and the proximal boom is tilted slightly above the horizontal position.

As a result, a rotational moment is applied to the distal end boom due to its own weight, and it rotates toward the side of the proximal boom using the rotation connecting pin 19 as a fulcrum, so that the distal boom can be easily folded. .

In addition, if you want to work with an arbitrary boom length of 18 or more, you can insert any number of extension booms between the upper boom 12d and the extension boom 12c to work with an arbitrary boom length including the longest boom length. You can change the length.

A pendant rope corresponding to the length of the inserted splicing boom is added to this pendant rope 13.

As described above, according to this embodiment, the distal end boom is folded to the side of the proximal boom from the state at the optimum boom length LB according to the work, and the proximal boom is supported by changing the attachment of the pendant rope. It can be placed in the transportation position simply by

Therefore, it becomes unnecessary to disassemble and assemble the splicing boom and the splicing pendant rope, and also to transport them separately.

In addition, when transporting a product that has been used with an optimum boom length of 18 or more, in the conventional technology, the entire splicing boom and the pendant rope for splicing were removed.
It is only necessary to remove the splicing boom and the splicing pendant rope that exceed the optimum boom length, reducing the time and labor required for disassembly and assembly, and reducing the number of transport vehicles that separately transport the splicing boom and splicing pendant rope.

In the embodiment described above, when the prydle 15 is provided with a hook portion and the lattice boom 12 is placed in the transportation position, the hook portion of the prydle 15 is connected to the split boom 12 of the boom 12c.
"It may be fixed to the boss 24 at the tip of C.

In this case, the tip side boom can be folded while the pendant rope 13 is tied to the tip of the upper boom 12d.

Further, the connection portion between the pendant ropes in the pendant rope 13 may be connected.

Figures 1 and 8 show an example of a lattice boom constructed with an optimum boom length shorter than the boom length LB, and Figure 7 is a side view showing the working state of a mobile crane equipped with the lattice boom. The figure is a side view showing the state of transportation.

This lattice boom 120 is composed of a lower boom 120a, one joint boom 120b, and an upper boom 120d.

Then, set the length of each boom to LBl, which is the optimum boom length for working when connected to each other (the shortest among the optimum boom lengths for working, which is smaller than the optimum boom length LB in Figure 3). and said splicing boom 1
20b was divided into two parts approximately in the middle, and the divided parts were connected in a structure similar to that shown in FIGS. It was designed so that it would look like this.

In the illustrated example, the length t3 of the proximal end boom and the length t4 of the distal end boom are approximately equal.

Therefore, in this embodiment, the total length L0 of the mobile crane during transportation is L, (L), so that the transition boom 120b can be placed in the transportation position while the boom 120b is attached, achieving the same effect as in the first embodiment. can.

Although the above embodiments have all been explained using a crawler type mobile crane as an example, it goes without saying that the present invention can also be applied to a wheel type mobile crane that can travel on public roads with its wheels.

As explained above, in the lattice boom of the present invention, the lengths of the lower boom, at least one joint boom, and the upper boom are selected so that the optimum boom length according to the work can be obtained, and The joint boom is divided in the middle, and a joint part is provided in the divided part to allow the distal boom to be folded to the side of the proximal boom, and a locking part provided at the distal end of the proximal boom is provided with a joint part for raising and lowering the boom. Since the pendant rope or prydle is attached to support the proximal end poom during transportation, the tip end boom can be folded to one side of the proximal end poom and the pendant rope or prydle can be attached and replaced from the working position. The transport position can be set within the vehicle length limit on general roads.

Therefore, it is not necessary to disassemble and assemble the splicing boom and the pendant rope for splicing as in the prior art, and it is also unnecessary to separately transport the splicing boom and the pendant rope for splicing.

Also, if the boom length is longer than the optimum boom length during work, all you have to do is remove the boom length that exceeds the optimum boom length and the extension pendant rope, which takes time to disassemble and assemble. In addition, it is possible to reduce labor and the number of transport vehicles that separately transport the removed splicing boom and splicing pendant rope.

[Brief explanation of the drawing]

Figures 1 and 2 show a mobile crane equipped with a conventional lattice boom. Figure 1 is a side view showing the working state, Figure 2 is a side view showing the transportation state, and Figures 3 and 4 are A mobile crane equipped with a lattice boom, which is an embodiment of the present invention, is shown; Fig. 3 is a side view showing the working state, Fig. 4 is a side view showing the transportation state, and Fig. 5 is the tip side of the lattice boom of the present invention. FIG. 6 is a plan view showing the structure of the connection between the boom and the proximal end poom, FIG. 6 is a side view thereof, FIGS. 1 and 8 are examples of lattice booms with different optimum boom lengths, and FIG. 1 is the lattice boom. FIG. 8 is a side view showing the working state of the mobile crane equipped with the mobile crane, and FIG. 8 is a side view showing the transporting state. 11... Crane body, 12... Lattice boom, 1
2a...Lower boom, 12bt12c"/joint boom, 12'c, 12"e"'split boom of joint boom, 12d...upper boom, 13...pendant loaf", 14...elevation rope, 15...Price dollar, 1
7a, 17b... fork end, 18at18b.
・・Eye end, 19・・Rotation connecting pin, 20・・
・Connection pin for attachment/detachment, 21...Fork type bracket,
22... Eye-shaped bracket 1, 23... Connection pin,
24.25... Boss, 11.12... Base end side boom length, t3, t4... Tip side boom length, LBjL
Bl...optimum boom length, L...total length of mobile crane.

Claims (1)

[Scope of utility model registration request] The lengths of the lower boom, which is attached to the crane body so that it can be raised and lowered, at least one joint boom, and the upper boom are selected so as to obtain the optimum boom length according to the work,
The connecting boom is divided in the middle and connected to each other by connecting pins, and by removing one connecting pin, the upper tip side boom is moved from the divided part to the lower base using the other connecting pin as a fulcrum. A joint means for folding the end boom to one side and a locking means for locking both booms in the folded position are provided, and a boom elevating pendant is attached to the locking portion provided at the tip of the base end boom. A lattice boom for a mobile crane, characterized in that a proximal end boom is supported when the distal end boom is folded by anchoring a rope or a prydle.