JPH07144876A - Load hoisting device for crane - Google Patents

Abstract

PURPOSE:To provide a hoisting device for crane, which can prevent the turning of a hoisting beam to easily and accurately perform the hoisting work, by utilizing wind to generate a load against the lateral force applied to a hoisted load under the condition that the load is being hoisted. CONSTITUTION:Movable wings 34 are provided in the rear end 16d of a hoisting beam 16. The movable wings 34 are projected straight symmetrically in both sides of a rotary shaft 36. The rotary shaft 36 is supported between an upper and a lower supporting arms 40, 40a of a fitting plate 38, which is fixed to the rear end 16d of the hoisting beam 16 at a right angle in the vertical direction so as to face downward, freely to be rotated. The rotary shaft 36 is coupled with a step motor 44 through a pair of reduction gears 42. Angle of rotation of the movable wings 34 is desirably set by the drive of the step motor 44. A load against the turning force generated by the wind applied to a hoisted load 20 is generated in these movable wings 34 by changing the angle of rotation of the movable wings 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane loader used when a load is hung under an obstacle.

[0002]

2. Description of the Related Art Conventionally, a crane is often used to lift a heavy object, but when a load is hung in a room or the like of a building using the crane, an obstacle such as a ceiling exists above the room. Therefore, in the past, for example, Japanese Patent Laid-Open No. 4-365
As disclosed in Japanese Patent No. 791 (B66C 13/08), a hanging portion of a load is provided at the tip of a horizontally extending hanging beam so that the hanging portion can be expanded and contracted, and the hanging portion is extended to load the load. There is a crane lifting device designed to be taken indoors. In this case, since the load of the suspended load moves due to the expansion and contraction of the hanging portion, a balance weight is movably provided on the beam, and the balance weight is controlled to move with the movement of the hanging portion.
The moment due to the suspended load and the moment due to the balance weight are balanced.

[0003]

However, in such a conventional crane hoisting device, the hoisting beam is hung from the hook block of the crane in a single-point supported state via the turning mechanism. For this reason, when the load is suspended by the wind and the wind acts on the suspended load, a lateral force is generated, and this lateral force causes the suspension beam to swivel around the suspended portion and There was a problem that the hanging work becomes difficult.

In view of the conventional problems, the present invention prevents the swinging of the suspension beam by generating a load against the lateral force acting on the suspended load by the wind while the suspended load is being lifted. It is an object of the present invention to provide a lifting device for a crane that can easily and accurately carry out lifting work of a hanging load.

[0005]

In order to achieve the above object, the present invention is directed to a suspension beam which is oriented in a substantially horizontal direction and is suspended by a crane, and a load suspension portion which is provided at a front end portion of the suspension beam. A balance weight that is movably attached to the suspension beam and that is moved to a position that balances the suspended load suspended in the luggage suspension portion to hold the suspended beam in a horizontal state; and a rear end of the suspended beam. And a movable vane which is provided on the surface of the suspension beam and whose rotation angle can be arbitrarily adjusted about a rotation axis provided on a surface along the length direction of the suspension beam.

Further, in the above construction, the suspension beam is suspended from the crane via at least two ropes connected to the front and rear ends of the suspension beam, and the suspension beam on the rear end side of the rope on the front end side of the ropes is suspended. Lengthen the rope,
It is desirable to arrange the luggage suspending portion at the front end of the suspending beam substantially directly below the suspending portion of the crane.

[0007]

In the crane hoisting device of the present invention having the above-mentioned structure, the movable blades provided at the rear end of the hanging beam have the rotary shaft provided on the surface along the length direction of the hanging beam. Since it is rotated about the center, by changing the rotation angle of the movable blade, the projected area in the horizontal direction perpendicular to the hanging beam, that is, the shape area for the crosswind component can be arbitrarily changed. Therefore, by adjusting the rotation angle of the movable blade, the shape area of the crosswind component received by the suspended load suspended in the luggage suspension portion at the tip of the suspension beam is equal to the shape area of the movable blade with respect to the crosswind component. By adjusting the load, it is possible to generate a load on the movable wing against the lateral force that attempts to turn the suspension beam by the wind received by the suspended load. Therefore, the lateral force generated in the suspended load can be canceled by the load generated in the movable blade, so that the suspension beam is prevented from being swung by the lateral wind component, and the suspending work of the suspended load can be performed easily and accurately. It can be carried out.

Further, in the above construction, the suspension beam is hung on a crane via at least two ropes connected to the front and rear ends of the suspension beam, and the rope on the rear end side of the rope on the front end side of these ropes is suspended. Lengthen the rope,
Since the luggage hanging part at the front end of the hanging beam is located almost directly below the hanging part of the crane, the balance weight movably attached to the hanging beam is moved to slightly change the tilt amount of the hanging beam. The front end of the beam can be finely moved horizontally along the length of the suspension beam. Therefore, the suspended load position suspended in the luggage suspending portion can be finely adjusted in the front-rear direction simply by moving the balance weight, so that the suspended load operation can be performed more easily and accurately.

[0009]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 and 2 show an embodiment of a crane lifting device 10 of the present invention, and FIG. 1 is a front view of the entire device,
FIG. 2 is a plan view of the rotary blade used in this embodiment.

That is, the crane lifting device 10 according to the present embodiment.
As shown in FIG. 1, is equipped with a hanging member 12 of a substantially triangular flat plate that is hung and hung from a hook block of a crane (not shown). The hanging member 12 has three pendant ropes 14,
The suspension beam 16 is suspended via 14a and 14b.
The hanging metal fitting 12 has a hook hole 12a formed at an upper end thereof for inserting into a hook block, and mounting holes 12b, 12c, 12d for fixing an upper end portion of the pendant ropes 14, 14a, 14b at a lower end portion. To be done.

The suspension beam 16 has mounting brackets 18, 18a, 18b fixedly attached to a front end 16a (left end in the drawing), a central portion, and a rear end 16b (right end in the drawing), respectively.
The lower ends of the pendant ropes 14, 14a, 14b are fixed to the mounting brackets 18, 18a, 18b. And, like this, the pendant ropes 14, 14
The suspension beam 16 suspended from the suspension fitting 12 via a and 14b is arranged in a substantially horizontal direction.

At this time, the pendant ropes 14 and 1
4a and 14b are pendant ropes 14 on the front end 16a side.
The pendant rope 14b on the side of the rear end 16b is made sufficiently long so that the front end 16a of the suspension beam 16 is connected to the suspension fitting 12
It is designed to be placed just below. The central pendant rope 14a is
After the length of 14b is determined, it is attached in a tensioned state.

The suspension beam 16 is provided with a luggage suspending portion 22 for suspending the suspended load 20 at the front end 16a. The luggage hanging portion 22 is provided with a sheave 28 that circulates and guides a wire 26 fed from an electric cylinder 24 installed above the central portion of the hanging beam 16 downward. The wire hanging downward from the sheave 28. 26
The suspended load 20 is detachably hooked on the lower end of the. Therefore, by driving the motor 24a of the electric cylinder 24, the telescopic rod 24b is retracted and retracted, and the wire 26 is fed or retracted, so that the suspended load 20 can be adjusted up and down.

Further, the suspension beam 16 has a driving device 30.
A balance weight 32 is movably attached via the balance weight 32. By moving the balance weight 32 along the length direction of the hanging beam 16, the hanging beam 16 can be held in a horizontal state in balance with the hanging load 20. It is like this.

Here, in this embodiment, a movable blade 34 is provided at the rear end 16b of the suspension beam 16, and the movable blade 3 is provided.
A load that opposes the turning force generated by the wind acting on the suspended load 20 is generated by means of 4.
As shown in FIG. 2, the movable blades 34 are provided on both sides of the rotary shaft 36 so as to symmetrically project in a straight line. The rotating shaft 36 is rotatably supported between the upper and lower support arms 40, 40a of a mounting plate 38 fixed vertically downward on the rear end 16b of the suspension beam 16.

Therefore, the movable vanes 34 are rotated about the rotary shaft 36 arranged in the vertical direction, and the rotary shaft 36 is stepped by the step motor 44 via the reduction gear set 42.
Is linked to. By driving the step motor 44, the rotation angle of the movable blade 34 is arbitrarily set, and the rotation angle of the movable blade 34 is changed, so that the suspension beam 16 moves in the lateral direction, that is, The projected area of the suspension beam 16 in the direction perpendicular to the lengthwise direction and in the horizontal direction can be adjusted.

In the crane hoisting device 10 of the present embodiment having the above-mentioned structure, the balance weight 32 is balanced with the hoisting load 20 suspended in the luggage suspending portion 22 to hold the suspension beam 16 substantially horizontally. Then, the suspended load 20 is transported to the target position by turning the crane and tilting the tower. When wind hits the hanging device 10 during this transportation, the hanging load 20 hung at the front end of the hanging beam 16 receives the lateral component of the wind (crosswind component), and the hanging fitting 12 is hooked. An attempt is made to pivot the suspension beam 16 around the hook block. At this time, by adjusting the rotation angle of the movable blade 34 so that the shape area of the crosswind component received by the suspended load 20 and the shape area of the movable blade 34 with respect to the crosswind component are set to be equal to each other. The load generated by the acting crosswind component can be offset by the load generated by the crosswind component on the hanging load 20, and the hanging beam 16 can be prevented from turning. Therefore, the hanging beam 16 is prevented from being swung by the side wind, and the hanging work of the hanging load can be performed easily and accurately.

Further, in this embodiment, the pendant rope 14b on the rear end side is made sufficiently longer than the pendant rope 14 on the front end side for suspending the suspension beam 16, and the front end 16a portion of the suspension beam 16 is connected to the hanging fitting 12. Since it is arranged substantially directly below, the balance weight 32 can be moved to slightly move the luggage suspending portion 22 at the front end 16a of the suspension beam 16 in the horizontal direction while slightly inclining the suspension beam 16. Therefore, only by moving the balance weight 32, the suspended load 2 suspended on the suspended luggage part 22 can be
Since the 0 position can be finely adjusted in the front-rear direction, it becomes possible to more easily and accurately perform the lifting work of the suspended load.

The electric cylinder 24 is used in this embodiment.
Since the suspended load 20 can be moved up and down by the electric cylinder 24, the suspended or mounted position of the suspended load 20 can be finely adjusted to perform the work more accurately and quickly. Further, in the present embodiment, the movable wing 34 is disclosed to be rotated around the rotary shaft 36 which is vertically oriented, but the present invention is not limited to this, and the rear end 16b of the hanging beam 16 is not limited thereto.
In the section, the rotary shaft can be arranged on the surface along the length direction of the suspension beam 16.

[0020]

As described above, in the crane hoisting device according to claim 1 of the present invention, the movable blades provided at the rear end of the hoisting beam are arranged along the length direction of the hoisting beam. Since the rotation angle is changed around the rotation axis provided on the surface, the rotation angle of this movable blade is adjusted so that the crosswind received by the suspended load at the luggage suspension part at the tip of the suspension beam. By equalizing the shape area of the component and the shape area of the movable blade with respect to the crosswind component, it is possible to generate a load on the movable blade against the lateral force that tries to turn the suspension beam by the wind received by the suspended load. it can. Therefore, the lateral force generated in the suspended load is canceled by the load generated in the movable blade, and the suspended beam is prevented from being swung by the lateral wind component, so that the suspending work of the suspended load can be performed easily and accurately.

According to a second aspect of the present invention, the suspension beam is suspended from a crane via at least two ropes connected to the front and rear ends of the suspension beam. Since the rope on the rear end side is longer than the rope on the side and the luggage hanging part at the front end of the hanging beam is placed almost directly under the hanging part of the crane, move the balance weight movably attached to the hanging beam. Only with the slight change in the inclination of the suspension beam,
Since the suspended load position can be finely adjusted in the front-rear direction by finely moving the suspended beam in the horizontal direction along the length direction, it is possible to perform various excellent effects that the suspending work of the suspended load can be performed more easily and accurately. Play.

[Brief description of drawings]

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

FIG. 2 is a plan view of a rotary blade used in an embodiment of the present invention.

[Explanation of symbols]

10 Crane Lifting Device 12 Hanging Metal Fittings 14 and 14b Rope 16 Hanging Beam 20 Hanging Load 22 Luggage Hanging Part 32 Balance Weight 34 Movable Blade 36 Rotating Axis

Claims (2)

[Claims] 1. A suspension beam that is hung in a crane in a substantially horizontal direction, a luggage suspension portion provided at a front end of the suspension beam, and a luggage suspension unit that is movably attached to the suspension beam. A balance weight that is moved to a position that balances the suspended load suspended in the portion and that holds the suspension beam in a horizontal state, and is provided at the rear end of the suspension beam, and extends along the length direction of the suspension beam. A hanging device for a crane, comprising: a movable wing capable of arbitrarily adjusting a rotation angle about a rotation axis provided on a curved surface. 2. The suspension beam provided with a balance way is hung from a crane via at least two ropes connected to the front and rear ends of the suspension beam, and the suspension beam is provided behind the rope on the front end side. Lengthen the rope on the end side,
The crane lifting device according to claim 1, wherein a load-hanging portion of the front end portion of the suspension beam is arranged substantially directly below a suspending portion of a crane.