JP2001302178A - Horizontal jib type crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal jib type crane capable of preventing a cable suspended from a traverse trolley from being twisted. SOLUTION: This horizontal jib type crane 30 comprises a traverse trolley 8 reciprocatably displacing between two pulleys 46 through an extended cable 48. A suspended cable 12 with a sling is suspended from the trolley 8 through a sheave 10. The suspended cable 12 is guided to a windup winch through fixed sheaves 20a and 20b at the tip of a jib. A length adjusting device 32 with two sheave groups 36a and 36b is installed on the way to the windup winch. A distance between the sheave groups 36a and 36b is varied in connection with the rotation of the pulley 46 and, when the trolley 8 is displaced a wound-up length of the suspended cable 12 between the sheave groups 36a and 36b is increased and decreased, and the length of the suspended cable 12 suspended from the trolley 8 is kept unchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal jib crane used for lifting and transporting materials in construction work of a high-rise building and the like, and more particularly, to a hanging line suspended from a trolley traveling along a horizontal jib. The present invention relates to a technique for preventing twisting.

[0002]

2. Description of the Related Art As a crane used for transporting materials at a construction site, there has been known a horizontal jib crane provided with a jib projecting horizontally. FIG. 4 schematically shows the configuration of a typical horizontal jib crane. The horizontal jib crane 2 includes a tower mast 4 erected at a construction site or the like, and a jib 6 projecting horizontally from the tower mast 4.
And The horizontal jib 6 is a top 5a of an A-type frame (guy support) 5 provided above the tower mast 4.
Supported by a wire 7 extending from The horizontal jib 6 is provided so as to be pivotable with respect to the tower mast 4 and covers a 360-degree area formed around the tower mast 4. The horizontal jib 6 is provided with a transverse trolley 8 which reciprocates along the longitudinal direction, and a hanging cable 12 is hung from the transverse trolley 8 in a U-shape. The suspension cable 12 is provided on a trolley
A hanging member 16 such as a hook or a bucket is attached to a lower end of the U-shape of the guide sheave 10a, 10b via a movable pulley 14 at a lower end thereof.
A construction material or the like to be transported is engaged with the hanger 16.

The hanging cable 12 extends from the trolley 8 to a jib tip 6a and a jib root 6b.
The end of the suspension cable 12 extending to the root portion 6 b of the jib 6 is fixed to a connection portion 18 protruding near the tower mast 4. On the other hand, the suspension cable 12 extending to the jib tip 6b is provided with fixed sheaves 10a, 10 provided there.
b, it is guided to the top 5a of the frame 5, and is connected from the relay drum 22 installed there to the winding drum 26 via the hoisting winch 24. By the driving of the hoisting winch 24, the hanging cable 12 is unwound or wound up from the winding drum 26, and the hanging tool 16 is raised and lowered.
The suspended load is unloaded.

On the other hand, the trolley 8 is connected to the base 6 of the jib 6.
5, the suspension cable 12 is guided from the front in the traveling direction to the other sheave 10b through the moving sheave 14 at the lower end via one sheave 10a, as shown in FIG. It is sent backward in the traveling direction. Since the sum of the length L1 of the suspension cable 12 arranged on the left side of the trolley 8 and the length L2 of the suspension cable 12 arranged on the right side of the trolley 8 is equal, even if the trolley 8 moves, The length of the U-shaped portion does not change, and the hanging length H of the hanging tool 16 does not need to change. Therefore, the suspended load can be transported horizontally.

[0005]

However, the horizontal jib crane having such a structure is installed particularly on the roof of a high-rise building or the like, and is located at an extremely high position above the ground.
For example, when lifting and lowering materials and the like from about 100 m above the ground, the sheave 10a, 1
0b, the hanging cable 12 itself and the hanging tool 16 at the tip thereof.
There is a case where the two suspension cables 12 are naturally twisted by the wind or the like. If the suspension cable 12 is twisted, the suspension cable 12 cannot be sent out from the front in the traveling direction of the traversing trolley 8 to the rear, and the traveling of the traveling trolley 8 must be interrupted, or the suspension cable 12 is lowered.・ Unable to wind up. In this case, the work of untwisting the suspension cable 12 must be performed each time, and the transfer operation may be interrupted and the transfer schedule may not be able to be properly digested.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a horizontal jib crane in which a suspension cable hanging from a trolley does not twist.

[0007]

In order to achieve the above object, a horizontal jib crane according to the present invention comprises a horizontal jib projecting in the horizontal direction, a transverse trolley running along the horizontal jib, and a horizontal jib. In a horizontal jib crane provided with a hanging line for hanging a hanging tool from a traversing trolley and a hoisting winch for hoisting and lowering the hanging line, displacement detecting means for detecting a displacement amount and a displacement direction of the traversing trolley. When,
Length adjusting means for adjusting the length of the hanging cable between the traversing trolley and the hoisting winch according to the detection result of the displacement detecting means so that the hanging length of the hanging cable does not fluctuate. The configuration was provided.

With this configuration, according to the present invention, even if the transverse trolley is displaced along the horizontal jib, the length adjusting means adjusts the length of the hanging cable between the transverse trolley and the hoisting winch according to the displacement direction and the displacement amount. Since the length is increased or decreased to increase or decrease the length, the hanging length of the hanging cable does not change, and the suspended load can be transported horizontally. Moreover, even if the trolley is displaced from the trolley to the hanging device, the trolley is not sent as in the conventional case, so that there is no risk of twisting of the trolley and the work is performed safely and promptly. be able to. The present invention can be suitably applied to a construction site of a high-rise building.

In particular, the displacement detecting means detects the driving amount and the driving direction of the trolley driving means for reciprocating the trolley, and detects the displacement direction and the moving amount of the trolley, thereby detecting the displacement of the trolley. The displacement direction and the displacement amount can be easily detected without separately providing a detecting means.

[0010] The length adjusting means may include at least one pair of pulleys spaced from each other, and the hanging cable may be wound between the pulleys, and the distance between the pulleys may be changed by the displacement. By adjusting according to the detection result of the detecting means, even if the distance variation between pulleys is small, it is possible to secure a large amount of variation in the length of the suspension cable according to the number of windings of the suspension cable, and it is extremely long. Adjustment of the length of the suspension cable can be easily performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a horizontal jib crane according to the present invention will be described below. 1 and 2
1 shows an embodiment of a horizontal jib crane according to the present invention. In FIGS. 1 and 2, the same components as those in the related art are denoted by the same reference numerals.

The horizontal jib crane 30 includes a horizontal jib 6 which is provided to extend horizontally from an intermediate portion of a tower mast 4 erected at a construction site or the like, and a traverse trolley which reciprocates along the horizontal jib 6. 8 is provided. A wire 7 is stretched between the top 5 a of the A-type frame (guy support) 5 on the tower mast 4 and the horizontal jib 6 to support the horizontal jib 6. Guide sheave 10 on trolley 8
Is provided, and a hanging cable 12 is hung from the guide sheave 10. A hook 17 is attached to the lower end of the hanging cable 12 as a hanging tool.

The hanging cable 12 extends from the traversing trolley 8 to the jib tip 6a, and a fixed sheave 20 provided thereat.
a and 20b to the frame top 5a. A relay drum 22 is installed on the frame top 5 a, and the suspension cable 12 is wound around the relay drum 22 and guided to a winding drum 26 via a hoisting winch 24. By driving the hoisting winch 24, the hoisting line 12 is pulled out from the winding drum 26 or wound on the winding drum 26 to change the hanging position H of the hook 17 and to lift and lower the suspended load.

The horizontal jib crane 30 having the above-described structure is used.
In this case, when the trolley 8 moves along the horizontal jib 6, the suspension length H of the suspension cable 12 also changes by an amount corresponding to the change in the distance between the trolley 8 and the fixed sheave 20a. Therefore, in the present embodiment, a length adjusting device (length adjusting means) for increasing or decreasing the length of the hanging cable 12 is provided on the path of the hanging cable 12 between the traversing trolley 8 and the hoisting winch 24. Provided,
The length of the suspension cable 12 is adjusted according to the displacement of the traversing trolley 8. One embodiment of this length adjustment device is schematically shown in FIG.

The length adjusting device 32 includes two pulley groups 36a and 36b arranged above and below at a distance from each other. Each of the pulley groups 36a and 36b is configured by arranging a plurality of pulleys 34 in parallel with each other. Each pulley group 36
The pulleys 34a and 36b are integrally connected to each other by U-shaped connecting members 38a and 38b provided so as to sandwich them from both sides. These two pulley groups 3
The hanging cable 12 is wound between 6a and 36b. The suspension cable 12 is routed back and forth between the pulley groups 36a and 36b, and is wound around each of the pulleys 34. These pulley groups 36
The distance between the pulley groups 36a and 36b is increased by increasing or decreasing the distance between the pulley groups 36a and 36b.
Of the hoisting winch 24 and the trolley 8
And the length of the sling 12 between them is increased or decreased. The amount of fluctuation of the suspension cable 12 is doubled in proportion to the number of turns of the suspension cable 12 with respect to the amount of fluctuation of the interval between the pulley groups 36a and 36b. That is, for example, if the number of windings of the suspension cable 12 is four, the suspension cable 1
The fluctuation amount of 2 is about eight times the fluctuation width between the pulley groups 36a and 36b. As described above, the length adjustment amount of the sling line 12 can be made large with respect to the fluctuation amount of the interval between the pulley groups 36a and 36b. Therefore, even if the sling line 12 is extremely long, the length can be easily adjusted. Can be.

The distance between the two groups of pulleys 36a and 36b varies in accordance with the direction and amount of displacement of the trolley 8. That is, the upper pulley group 36
a is integrally fixed to the top 5a of the A-type frame 5 via a support member 39 extending upward from the connecting member 38a, and the lower pulley group 36b is suspended from the upper pulley group 36a. It is suspended and supported via a cable 12. A chain 42 hangs down from the connecting member 38b of the lower pulley group 36b, and the chain 42 is engaged with a trolley drive mechanism 40 that reciprocates the traverse trolley 8.

Here, the trolley drive mechanism 40 includes two pulleys 46 disposed at both ends of the traveling path of the traversing trolley 8, respectively, and a towing 48 bridged between the two pulleys 46. Both ends of the tow line 48 are connected to both sides of the trolley 8, respectively. The trolley 8 is reciprocated by the pulley 46 being driven to rotate by a motor or the like. Rolling trolley 8
Is determined according to the rotation direction and the rotation amount of the pulley 46. The chain 42 extended from the lower pulley group 36b is engaged via a sprocket 52 with a rotating shaft 50 that is driven to rotate in conjunction with one of the pulleys 46, and when the pulley 46 is rotated, its rotation direction is changed. The chain 42 is fed or wound up according to the rotation amount.

In this embodiment, when the pulley 46 rotates in the direction to move the traverse trolley 8 to the jib tip 6a, the chain 42 is wound around the sprocket 52, and the lower pulley group 36b is moved to the upper pulley group. The distance between the pulley groups 36a and 36b is increased by increasing the distance between the pulley groups 36a and 36b by increasing the distance between the pulley groups 36a and 36b. Also,
When the pulley 46 rotates in a direction to move the trolley 8 away from the jib tip 6a, the chain 42 is extended from the sprocket 52, and the lower group of pulleys 36b approaches the upper group of pulleys 36a to reduce the distance therebetween. As a result, the winding amount of the suspension cable 12 between the pulley groups 36a and 36b is reduced. The chain 42 is connected to the sprocket 5
The lifting of the lower pulley group 36b when the pulley group 36b is pulled out from the pulley 2 is due to the pulling force acting on the suspension cable 12 at that time.
When the pulling force of the chain 42 is loosened, the lower pulley group 36b is pulled upward by this tension and rises toward the upper pulley group 36a.

FIG. 3 shows another embodiment of a mechanism for raising and lowering the lower pulley group 36b. This mechanism is
A guide member 60 for guiding the lower group of pulleys 36b along the vertical direction, a rack member 62 extending downward from the lower group of pulleys 36b, and a pinion gear 64 engaged with the rack member 62; Consists of Guide member 60
Is composed of a long member formed into a concave cross section along the longitudinal direction, and the connecting member 38b of the lower pulley group 36b
Are provided on both sides of the lower pulley group 36b so as to sandwich the lower pulley group 36b from both sides, thereby restricting the roll of the lower pulley group 36b. The rack member 62 has an upper end integrally joined to the connecting member 38b of the lower pulley group 36b, and has a gear portion 62a formed on the surface thereof along the longitudinal direction. A gear portion 64a on the outer periphery of the pinion gear 64 is engaged with the gear portion 62a. The pinion gear 64 is provided integrally with the rotating shaft 50 that is driven to rotate in conjunction with the pulley 46.
Is driven to rotate, the pinion gear 64 is driven to rotate, and the lower pulley group 36b is driven up and down via the rack member 62.

The amount of displacement of the trolley 8 and the amount of increase or decrease in the length of the suspension cable 12 are set so as to coincide with each other. This setting is performed by appropriately setting the number of turns of the suspension cable 12 between the pulley groups 36a and 36b, the gear ratio of the output shaft 50 to the pulley 46, the number of teeth of the sprocket 52, and the like. As a result, even if the trolley 8 moves, the length of the suspension cable 12 is adjusted in accordance with the amount of movement, so that the suspension length of the suspension cable 12 from the trolley 8 to the hook 17 is not changed. Only In addition, the portion of the suspension cable 12 from the trolley 8 to the hook 17 is not sent with the movement of the trolley 8, so that the suspension cable 1 is different from the conventional one.
2 does not twist. Work safety during traveling of the traversing trolley 8 can be sufficiently ensured.

[0021]

According to the horizontal jib crane according to the present invention, even if the trolley moves along the jib, the length adjusting means adjusts the length of the trolley and the hoisting winch according to the amount of movement of the trolley. In this case, the length of the hanging rope is increased or decreased, so that the hanging length of the hanging rope does not change, and the suspended load can be transported horizontally. In addition, since the sling is not sent along with the movement of the trolley, there is no fear that the sling is twisted as in the related art. The work of transporting the suspended load can be performed quickly and sufficiently safely without delay.

Further, if the driving amount and the driving direction of the driving means of the traversing trolley are detected, a separate means for directly detecting the displacement direction and the displacement amount of the trolley becomes unnecessary.
Detection can be performed easily.

[0023] Further, by winding a suspension cable between at least one pair of pulleys spaced apart from each other and adjusting the distance between these pulleys according to the detection result of the displacement detecting means, the distance between the pulleys can be reduced. The length adjustment width of the suspension cable can be ensured large according to the number of turns of the suspension cable, and the length of the suspension cable can be easily adjusted even for extremely long suspension cables. .

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a horizontal jib crane according to the present invention.

FIG. 2 is a schematic configuration diagram schematically showing a configuration of an embodiment of a horizontal jib crane according to the present invention.

FIG. 3 is a front view and a side view showing another driving method of the length adjusting device of the horizontal jib crane according to the present invention.

FIG. 4 is a schematic configuration diagram schematically showing a configuration of a conventional typical horizontal jib crane.

5 is a schematic configuration diagram showing a configuration of the horizontal jib crane of FIG. 3 when a traverse trolley moves.

[Explanation of symbols]

 Reference Signs List 4 Tower mast 6 Jib 8 Traversing trolley 10 Sheave 12 Hanging cable 16 Hanging tool 20a, 20b Sheave 22 Relay drum 24 Take-up winch 26 Take-up drum 32 Length adjuster 34 Pulley 40 Trolley drive mechanism 42 Chain 46 Pulley 52 Sprocket

Claims (3)

[Claims] 1. A horizontal jib extending in a horizontal direction, a trolley running along the horizontal jib, a hanging cable for hanging a hanging tool from the trolley, and a winding for hoisting and lowering the hanging cable. In a horizontal jib crane provided with an upper winch, a displacement detecting means for detecting a displacement amount and a displacement direction of the traversing trolley, and according to a detection result of the displacement detecting means so that a hanging length of the hanging cable does not change. And a length adjusting means for adjusting the length of the suspension cable between the traverse trolley and the hoisting winch. 2. The displacement detecting means detects a driving amount and a driving direction of a trolley driving means for reciprocally moving the trolley, and detects a displacement direction and a displacement amount of the trolley. Item 2. A horizontal jib crane according to item 1. 3. The length adjusting means comprises at least one pair of pulleys spaced apart from each other, the sling being wrapped between the pulleys, and displacing the distance between the pulleys. The horizontal jib crane according to claim 1, wherein the adjustment is performed according to a detection result of the detection unit.