JPH07291586A - Crane - Google Patents

Abstract

PURPOSE:To reduce a maximum ground height of a crane at transportation and provide easy adjustment work of a boom point part according to a maximum hanging load of the crane. CONSTITUTION:A boom point part 37 is removably connected at a tip side of an upper boom lattice part 34 through upper and lower connecting pins 43. The boom point part 37 is rotationally moved downwardly, taking the lower connecting pin 43 for a fulcrum at transportation and also the boom point part 37 is supported by a boom point support rope part 45A and the upper boom lattice part 34 is supported by a boom lattice support rope part 45C respectively. Thereby, a maximum ground height of a crane at transportation can be reduced efficiently and safely and adjustment work of the boom point part according to a maximum hanging load can be performed easily in a short time by optionally fitting the boom point part 37 having appropriate numbers of boom point sheaves 41 in the upper boom lattice part 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane preferably used for material transportation to a high place at a construction site.

[0002]

2. Description of the Related Art Generally, at a construction site such as a high-rise building, a crane is usually used to carry materials from the ground to a high place.

Therefore, FIGS. 5 and 6 show a conventional crane.

In the drawing, 1 is a lower traveling body, 2 is an upper revolving body as a crane main body which is rotatably provided on the lower traveling body 1, and on the upper revolving body 2, a guide is provided on the tip side. An A-shaped frame 3 having a sheave 3A, a counterweight 4 and the like are provided. Further, the upper swing body 2 is provided with a winding drum 5 including a main winding drum 5A, an auxiliary winding drum 5B, and an undulating drum 5C.

Reference numeral 6 denotes a boom having a frame structure whose base end side is attached to the upper revolving structure 2 so as to be able to move up and down. The boom 6 is a boom lattice whose base end side is attached to the front part of the upper revolving structure 2 so as to be able to move down. The boom 7 includes a portion 7 and a boom point portion 8 that is provided on the tip end side of the boom lattice portion 7 and that supports a later-described load hanging hook 12 so as to be able to move up and down. The boom lattice part 7 has four connecting pins 9, 9, ...
The upper boom lattice portion 7A and the lower boom lattice portion 7B are pin-connected by (only two are shown), and the boom point portion 8 is integrally provided on the tip side of the upper boom lattice portion 7A.

The boom point section 8 has a plurality of boom point sheaves 10 and the boom point sheaves 1
Two guide sheaves 11, which are spaced apart from each other on the upper side of 0, are rotatably provided.

Reference numeral 12 denotes a load hanging hook supported on the boom point portion 8 via a main winding rope 14 which will be described later. The load hanging hook 12 has a plurality of hook sheaves 1 (only one is shown).
3 is rotatably provided.

Reference numeral 14 denotes a main winding rope whose base end side is wound around a main winding drum 5A. The tip end side of the main winding rope 14 is wound around a guide sheave 11, a boom point sheave 10 and a hook sheave 13 in sequence. It is hooked on the boom point portion 8. Then, the main hoisting rope 14 is wound or unwound by the main hoisting drum 5A, so that the load hanging hook 12 is moved up and down.

Reference numeral 15 denotes a boom rope whose base side is wound around the hoisting drum 5C of the hoisting drum 5 and whose tip side is attached to the boom point portion 8 of the boom 6. In the middle of the boom rope 15, a plurality of sheaves are provided. A bridle 16 having a (not shown) and a hanger 17 having a plurality of sheaves (not shown) around which a boom raising / lowering rope 15B described later is wound are provided between the sheaves of the bridle 16. .

The boom rope 15 has a boom support rope 15A composed of a pendant rope having a base end side connected to a bridle 16 and a tip end side connected to a boom point portion 8 of the boom 6, and a base end side wound around an undulating drum 5C. After being turned, the tip side is sequentially wound around the guide sheave 3A of the A-type frame 3, the sheave of the bridle 16 and the sheave of the hanger 17, and then is constituted by a boom / elevation rope 15B hooked on the hanger 17. Then, the boom raising / lowering rope 15B is wound around the undulating drum 5C to bring the bridle 16 and the hanger 17 close to each other to raise the boom 6 upward and unwind from the undulating drum 5C. The boom 6 is moved downward by separating from the hanger 17.

In the conventional crane thus constructed, for example, the boom 6 is lifted and lowered to raise and lower the boom 6 while the main rope 14 is lifted.
By lifting and lowering the load-hanging hook 12 by unwinding and winding, the lifted load is lifted and lowered by the load-hanging hook 12, and the upper swing body 2 is swung to move the load to a desired position. Carry out the work.

[0012]

By the way, when transporting the above-mentioned crane to a construction site or the like, normally, the crane is changed from the working posture shown in FIG. 5 to the transportation posture shown in FIG. 6 on the trailer 21. The trailer 21 is towed by the tractor 22.

At this time, the crane moves the boom 6 so that the elevation angle of the boom 6 with respect to the road surface becomes as small as possible, so that the height of the guide sheave 11 provided on the boom point portion 8, that is, the transportation height. The maximum height H of the crane at the time is set to be as low as possible.

However, during the transportation of the crane as described above, if there is an obstacle (for example, a tunnel or an overpass) at a position where the ground height is lower than the maximum ground height H of the crane during transportation, There is a problem that safety during transportation cannot be ensured.

On the other hand, for example, JP-A-5-14788
In Japanese Patent Laid-Open No. 5 and Japanese Patent Laid-Open No. 5-147886 (hereinafter, referred to as other conventional technology), a boom is configured to be disassembled into a plurality of lattice parts and the like, and the boom is disassembled during transportation to shorten the total length. Has proposed a crane in which the height of the boom at the ground is lowered.

However, in such a conventional crane, when the working posture is changed to the transport posture,
In addition to the work of disassembling the boom into a plurality of lattice parts and the like, it is necessary to reassemble each lattice part of the disassembled boom when changing the transportation posture to the work posture. In addition, since a small crane is required for disassembling and assembling these booms, there is a problem that it is not possible to efficiently change the work posture to the transport posture or the transport posture to the work posture. .

Further, the maximum load (maximum load) of the load hoisted by the crane is the boom point sheave 10 rotatably provided at the boom point portion 8.
It is determined by the number of sheets. Therefore, when changing the crane from the transportation posture to the working posture, the boom point portion 8 is usually set in accordance with the maximum suspended load required at the work site.
There is a problem that it involves a complicated adjustment work for adjusting the number of boom point sheaves 10 provided in the.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to set the maximum ground height at the time of transportation to be low, and the work posture can be changed efficiently and safely. It is an object of the present invention to provide a crane that is capable of easily adjusting the boom point according to the maximum suspended load.

[0019]

In order to solve the above-mentioned problems, a crane according to a first aspect of the present invention is a crane main body provided with a hoisting drum, and a base end side of the crane main body is attached to the crane main body so that it can be lifted and lowered. A boom with a load-hanging hook hanging down from the side, and a boom rope whose base end is wound around the hoisting drum and whose tip end is attached to the tip end side of the boom in order to raise and lower the boom with respect to the crane body. Consists of.

The boom is composed of a boom lattice part having a base end side attached to the crane main body so that the boom can be raised and lowered, and a boom point part provided on the tip end side of the boom lattice part and supporting the load hanging hook. The boom point portion is detachably connected to the tip end side of the boom lattice portion via upper and lower connecting pins.

Further, as in the crane according to claim 2,
At the time of transportation, the boom point portion is configured such that the upper connecting pin is removed and is rotatably connected to the tip end side of the boom lattice portion by the lower connecting pin, and is attached to the tip end side of the boom rope. Is a first support rope portion attached to the boom point portion, and a second support rope portion branched from the first support rope portion with a dimension shorter than the first support rope portion and attached to the boom lattice portion. It is desirable to provide a rope part.

[0022]

According to the invention of claim 1, the boom point portion can be easily attached to and detached from the tip side of the boom lattice portion by attaching and detaching the upper and lower connecting pins. The work of adjusting the number of boom point sheaves provided in the boom point portion can be easily performed according to the maximum suspended load. Furthermore, for example, a plurality of sets of boom point parts having different numbers of boom point sheaves are prepared in advance, and one of the plurality of sets of boom point parts having the number of boom point sheaves suitable for the work content is By selectively attaching to the tip side of the boom lattice part via the connecting pin, the time required for the adjustment work of the boom point part according to the maximum suspended load can be significantly reduced.

According to the second aspect of the invention, when the boom is changed to the transportation posture, the first support rope provided on the tip side of the boom rope is attached to the boom point portion and the second support rope is attached. By removing the upper connecting pin with the rope part attached to the boom lattice part, the boom point part can be rotated downward from the tip end side of the boom lattice part with the lower connecting pin as a fulcrum.
Then, at this time, the first support rope portion holds the boom point portion in a state in which the boom point portion is rotated downward from the tip end side of the boom lattice portion, so that the maximum ground height of the boom point portion during transportation can be lowered. Moreover,
At this time, the work of changing the transportation posture can be efficiently and safely performed without complicated disassembling work or the like.

[0024]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIGS. 5 and 6 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31 indicates a crane according to the present embodiment, and the crane 31 is an A type frame having a lower traveling body 1, an upper rotating body 2 as a crane body, and a guide sheave 3A, as in the prior art. 3, a counterweight 4, a winding drum 5 including a main winding drum 5A, an auxiliary winding drum 5B, and an undulating drum 5C, and the like,
The construction of a boom 32 and a boom rope 44, which will be described later, of the crane 31 is different from that of the prior art.

Reference numeral 32 denotes a boom whose base end side is attached to the upper revolving superstructure 2 so as to be able to move up and down. Boom lattice part 33 and egg boom lattice part 3
3, a boom point portion 36, which will be described later, is provided on the tip end side of the load supporting hook 3 and supports the load hanging hook 12 so as to be able to move up and down.

The boom lattice portion 33 is composed of an upper boom lattice portion 34 and a lower boom lattice portion 35. The base end side of the lower boom lattice portion 35 is attached to the upper revolving structure 2 so as to be able to move upward and downward, and the tip side of the lower boom lattice portion 35. The base end side of the upper boom lattice part 34 is pin-coupled to the upper boom lattice part 34 through a total of four coupling pins 36, 36, ... (Only two are shown).

The tip side of the upper boom lattice portion 34 is
As shown in FIGS. 2 and 3, two upper connecting portions 34A, 34A and two lower connecting portions 34B, 34B to which the boom point portion 37 is connected via each connecting pin 43 described later.
(Only one is shown in each figure), and a bracket 34C to which a boom lattice support rope portion 45C of the boom rope 44, which will be described later, is attached is projected on the upper coupling portion 34A when the crane 31 is transported.

Reference numeral 37 denotes a boom point portion detachably provided on the tip side of the upper boom lattice portion 34. The boom point portion 37 includes a boom point main body 38 having a frame structure as shown in FIGS. The boom point body 38
The sheave brackets 39 and 40 fixed to the sheave bracket 39, the plurality of boom point sheaves 41 (only one is shown) rotatably supported by the sheave bracket 39, and the guide sheave 42 rotatably supported by the sheave bracket 39. It is roughly composed.

Here, on the base end side of the boom point body 38, there are two upper connecting portions 38A, 38 spaced apart left and right.
A and two lower side connecting portions 38B, 38B (only one of which is shown) are provided, and each connecting portion 38A, 38B has two connecting pins 43, 43, ... (Only shown), each connecting portion 3 of the upper boom lattice portion 34
4A and 34B are detachably connected.

Further, on the sheave bracket 39, the front end side of the main winding rope 14 wound on the main winding drum 5A at the base end side is sequentially wound around the guide sheave 42, the boom point sheave 41 and the hook sheave 13 of the load hanging hook 12. It has been turned and hung up.

Reference numeral 44 denotes a boom rope whose base end side is wound around the undulating drum 5C and whose front end side is attached to the sheave bracket 40 of the boom point portion 37. The boom rope 44 corresponds to the boom rope 15 described in the prior art. Although the boom ropes 44 are configured in substantially the same manner, the boom rope 44 has a boom support rope 45, which is a pendant rope connected to the bridle 16 at the base end side and attached to the sheave bracket 40 of the boom point portion 37 at the tip end side, and a boom support rope 45 at the base end side. It is wound around the undulating drum 5C, and its tip side is wound around the guide sheave 3A of the A-type frame 3, the sheave of the bridle 16 and the sheave of the hanger 17 in sequence, and then is composed of a boom / elevation rope 46 hooked on the hanger 17. Has been done.

Here, on the tip side of the boom support rope 45, a boom point support rope portion 45A as a first support rope portion, which is attached to the sheave bracket 40 of the boom point portion 37, and the boom point support rope are provided. Branched from the base end side of the portion 45A via a connector 45B,
A boom lattice support rope portion 45C as a second support rope portion is provided, and the boom lattice support rope portion 45 is provided.
C has a length (dimension) of about 1/3 of that of the boom point support rope portion 45A.

Here, the boom lattice support rope portion 45C
A mounting bracket 47 is provided at the tip of the mounting bracket 47.
Is attached to the tip end side of the upper boom lattice part 34 via a bracket 34C via a bolt or the like when the crane 31 is transported.

The crane 31 according to the present embodiment has the above-mentioned construction, and its basic operation is not different from that of the prior art.

However, in the present embodiment, the boom 32
Is configured to be disassembled by the boom lattice portion 33 and the boom point portion 37, and the boom lattice portion 33 and the boom point portion 37 are detachably connected via the upper and lower connecting pins 43, 43 ,. Therefore, the following operational effects can be obtained.

That is, the work of adjusting the number of boom point sheaves 41 provided in the boom point portion 37 in accordance with the maximum suspended load required at the work site is performed by, for example, a plurality of sets of boom point sheaves having different numbers of boom point sheaves. Of the plurality of sets of boom point parts, the one having a number of boom point sheaves suitable for the work content is selectively used for the upper boom lattice part through the upper and lower connecting pins 43. By attaching to 34, it can be easily performed in a short time.

Further, since machining and repair work for the boom point portion 37 can be performed in a state where the boom lattice portion 33 is detached from the boom lattice portion 33, the scale of equipment for carrying out such machining and repair work can be reduced. Therefore, the manufacturing cost can be reduced.

Also, in this embodiment, the crane 31
Of the upper boom lattice portion 34 during transportation of
By removing the connecting pin 43 from the connecting portion between A and each upper connecting portion 38A of the boom point main body 38, the boom point portion 37 is moved to the lower connecting portion 34B of the upper boom lattice portion 34 and the lower side of the boom point main body 38. Side connecting portion 38B
A boom point support rope that rotatably connects to the tip side of the boom lattice part 33 via a connection part (lower connection pin 43) with and a boom point part 37 is supported on the tip side of the boom rope 44. Since the portion 45A and the boom lattice support rope portion 45C that supports the boom lattice portion 33 are provided, the following operational effects can be obtained during transportation of the crane 31 or the like.

First, when the crane 31 is changed from the working posture shown in FIG. 1 to the transportation posture shown in FIG. 4, the boom raising / lowering rope 46 is unwound from the hoisting drum 5C.
As shown in FIG. 4, the boom 32 is moved so that the elevation angle with respect to the road surface becomes as small as possible. Then, as shown in FIG. 3, the attachment metal fitting 47 of the boom lattice support rope portion 45C provided on the tip end side of the boom support rope 45 is attached to the bracket 34C protruding from the upper boom lattice portion 34 via a bolt or the like.

In this manner, with the tip end side of the boom 32 supported by the boom rope 44, the upper connecting portions 34A of the upper boom lattice portion 34 and the upper connecting portions 38A of the boom point body 38 are connected to each other. Connecting pin 43
Remove. As a result, the boom point portion 37 pivots downward with the connecting portion (lower connecting pin 43) between the lower connecting portion 34B of the upper boom lattice portion 34 and the lower connecting portion 38B of the boom point main body 38 as a fulcrum. In this state, it is held by the boom point support rope portion 45A provided on the tip end side of the boom support rope 45.

As a result, as shown in FIG. 4, the height of the guide sheave 42 provided on the boom point portion 37, that is, the maximum height during transportation of the crane 31, is increased by the amount by which the boom point portion 37 is rotated downward. The ground height H'can be set lower than the maximum ground height H during transportation of the conventional crane shown in FIG.

As described above, according to this embodiment, the maximum ground height H'of the crane 31 during transportation can be set lower than the maximum ground height H'of the conventional crane during transportation. Moreover, the work of changing the transportation posture of the crane 31 can be performed efficiently and safely without performing the work of disassembling the boom using a small crane.

In the above embodiment, when the crane 31 is transported, the attachment metal fitting 47 of the boom lattice support rope portion 45C provided on the tip side of the boom support rope 45 is attached to the bracket 34C projecting from the upper boom lattice portion 34. The case of attachment is described as an example, but as shown by the alternate long and short dash line in FIG. 2, for example, the female thread portion 4 is attached to the upper boom lattice portion 34.
8 and the like may be bored, and the mounting member 47 may be fixed by a bolt or the like that is screwed into the female screw portion 48.

In the above embodiment, the crawler crane has been described as an example, but the present invention is not limited to this, and can be applied to, for example, a truck crane.

[0046]

As described in detail above, according to the present invention, the boom lattice portion and the boom point portion are detachably connected via the upper and lower connecting pins, and when the crane is transported,
By removing the upper connecting pin, the boom point can be held in a state of being rotated downward from the tip side of the boom lattice part using the lower connecting pin as a fulcrum. The height can be set low, and the work for changing the transportation posture can be efficiently and safely performed without using a small crane or the like.

Since the boom point portion can be attached to and detached from the boom lattice portion, the work of adjusting the number of boom point sheaves can be easily performed according to the maximum suspended load required at the work site. . further,
For example, prepare a plurality of sets of boom point parts with different numbers of boom point sheaves in advance, and select one of these plurality of sets of boom point parts that has the number of boom point sheaves suitable for the work content. By selectively attaching to the tip end side of the boom lattice part via the, it is possible to greatly reduce the time required for the adjustment work of the boom point part according to the maximum suspended load. Also, since machining and repair work for the boom point part can be performed with the boom lattice part removed, it is possible to reduce the scale of equipment for performing such machining and repair work, and to reduce manufacturing costs. Can be reduced.

[Brief description of drawings]

FIG. 1 is an overall view showing a working state of a crane according to an embodiment of the present invention.

2 is an enlarged external view of the boom tip side of the crane shown in FIG. 1. FIG.

FIG. 3 is an enlarged external view showing the boom tip side of the crane in a transportation state.

FIG. 4 is an overall view showing a transportation state of a crane by a trailer.

FIG. 5 is an overall view showing a working state of a crane according to a conventional technique.

FIG. 6 is an overall view showing a transportation state of a crane by a trailer.

[Explanation of symbols]

2 Upper revolving structure (crane body) 5 Hoisting drum 5A Main winding drum 5B Supplementary drum 5C Elevating drum 12 Lifting hook 32 Boom 33 Boom lattice part 34 Upper boom lattice part 34A, 38A Upper side connecting part 34B, 38B Lower side connecting part 34C Bracket 35 Lower Boom Lattice Part 37 Boom Point Part 43 Connecting Pin 44 Boom Rope 45 Boom Support Rope 45A Boom Point Support Rope Part (First Support Rope) 45C Boom Lattice Support Rope Part (Second Support Rope) 46 Boom Depression Rope 48 Female Thread Part

Claims (2)

[Claims] 1. A crane main body provided with a hoisting drum, a boom having a base end side attached to the crane main body so as to be capable of being raised and lowered, and a load hanging hook hanging from the tip side, and the boom with respect to the crane main body. To cheer you up,
In a crane comprising a boom rope whose base end side is wound around the hoisting drum and whose tip end side is attached to the tip end side of the boom, the boom is a boom lattice part whose base end side is attached to the crane main body so that the boom can be lifted and lowered. The boom point portion is provided at the tip end side of the boom lattice portion and supports the load hanging hook, and the boom point portion is detachably connected to the tip end side of the boom lattice portion via upper and lower connecting pins. A crane characterized by that. 2. The boom point portion is configured such that the upper connecting pin is removed during transportation and the lower connecting pin is rotatably connected to the tip end side of the boom lattice portion, and the boom point portion is configured to be rotatable. On the tip side of the rope, a first support rope portion attached to the boom point portion, and a branch from the first support rope portion having a dimension shorter than the first support rope portion, and attached to the boom lattice portion. The crane according to claim 1, further comprising a second support rope portion that is provided.