JPH0753176A - Load suspending device for crane - Google Patents

Abstract

PURPOSE:To simplify the shift control for a suspended load and increase the longitudinal shift quantity of the suspended load for the tilt quantity of a suspending beam, by shifting the suspended load in the longitudinal, direction by positively tilting the suspending beam through the shift of a balance weight. CONSTITUTION:A suspended load raising and lowering device 14 is installed at the front end part of a suspending beam 12, and a balance weight 16 is installed so as to be shiftable on the suspending beam 12. The front end part, center end part, and the rear end part of the suspending beam 12 are installed on a hooking tool 24 through a front suspending rope 18, center suspending rope 20, and a rear suspending rope 22, and the hooking tool 24 is hooked with the hook block 26 of a crane. The rope 30 of the motor-driven cylinder 28 of the suspended load raising and lowering device 14 is wound on a fixed sheave 32 installed at the front end of the suspending beam 12 and suspended, and a curtain wall 36 is installed on an equalizer 34 at the lower end part of the rope 30. The rear suspending rope 22 is made sufficiently longer than the front suspending rope 18, and the equalizer 34 is approached to the vertical lower part of the hook block 26.

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 Laid-Open Patent Publication No. 791, a hanging portion for luggage is provided at the tip of a horizontally extending hanging beam so as to be extendable and contractible, and the luggage can be taken into the room by extending the hanging portion. It is like this.

In this case, since the load of the suspended load moves due to the expansion and contraction of the suspended portion, a balance weight is movably provided on the suspended beam, and the balance weight is controlled to move as the suspended portion moves. Thus, the moment due to the suspended load and the moment due to the balance weight are balanced.

[0004]

However, in such a conventional crane hoisting device, as described above, the hanging part of the load is provided on the horizontal hanging beam so that the hanging part can be extended and contracted. Since the balance weight is moved along with the expansion and contraction, it is necessary to control the movement amount of the balance weight according to the expansion and contraction amount of the hanging portion. Therefore, the control for moving the balance weight in accordance with the movement of the suspended portion becomes complicated, and the control device becomes large-scaled, which causes an increase in cost.

In view of the conventional problems, the present invention simplifies the movement control of the suspended load by positively inclining the suspended beam by moving the balance weight to move the suspended load back and forth. An object of the present invention is to provide a hoisting device for a crane, which can further increase the amount of forward and backward movement of a hoisted load with respect to the amount of inclination of the hoisting beam.

[0006]

In order to achieve the above object, the present invention provides a suspension beam, at least both front and rear ends of which are suspended substantially horizontally by a crane through a front suspension rope and a rear suspension rope, and a suspension beam. Equipped with a hoisting / unloading device provided at the front end of the beam and a balance weight movably attached to the hoisting beam, and moving the hoisting beam as a whole backward by making the rear hoisting rope sufficiently longer than the front hoisting rope. Then, the load hoisting unit of the hoisting and hoisting device is configured to approach the hook block vertically below the hook block.

[0007]

In the crane hoisting device of the present invention having the above-described structure, the balance weight is moved along the suspension beam suspended substantially horizontally in the crane via at least the front suspension rope and the rear suspension rope. As a result, the inclination angle of the suspension beam can be changed by changing the position of the center of gravity of the suspension beam. In this way, when the tilt angle of the suspension beam is changed, the suspension beam moves back and forth entirely around the portion where the front and rear suspension ropes are hooked by the crane, and the front end portion of the suspension beam is moved. It is possible to move the suspended load portion of the suspended load lifting device provided in the front and rear. Therefore, in order to move the load suspended on the suspended load portion back and forth, it is only necessary to perform the movement control of the balance weight, and the movement control of the suspended load can be significantly simplified.

At this time, the suspension beam is configured such that the rear suspension rope is made sufficiently longer than the front suspension rope and the suspension beam is moved rearward as a whole, so that the load suspension portion of the suspension load lifting device is placed vertically below the hook block. Since they are close to each other, the horizontal movement amount of the load hanging portion when the tilt angle of the hanging beam changes can be made significantly larger than the vertical movement amount.Therefore, secure sufficient forward and backward movement amount of this load hanging portion. You can

[0009]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a crane lifting device 1 of the present invention.
It is a side view which shows one Example of No. 0.

That is, the crane lifting device 10 according to the present embodiment.
Is provided with a hanging beam 12 that is arranged in a substantially horizontal direction in the front-back direction (the left side in the figure in which the hanging load 36, which will be described later, moves is the front), and the hanging load is lifted at the front end of the hanging beam 12. The lowering device 14 is provided, and a balance weight 16 is movably provided on the lower side of the suspension beam 12, which is a general configuration. One ends of the front suspension rope 18, the center suspension rope 20 and the rear suspension rope 22 are attached to the front end portion, the center portion and the rear end portion of the suspension beam 12, respectively, and the other ends of these suspension ropes 18, 20, 22 are It is attached to the hook 24. When the hook 24 is hooked on a hook block 26 of a crane (not shown), the crane load device 10 is hung on the hook block 26.

The lifting / unloading device 14 is an electric cylinder 28.
The rope 30 that is provided from the electric cylinder 28 is a fixed sheave 3 attached to the front end of the suspension beam 12.
It circulates in 2 and hangs down, and the equalizer 34 as a load hanging part is provided in the lower end part. Then, a curtain wall 36 as a suspended load is hung on the equalizer 34.

The balance weight 16 is configured to move along the suspension beam 12 via a drive mechanism 38 using an electric motor or the like, and an inclination sensor 40 is attached to the suspension beam 12. This tilt sensor 4
The balance weight 16 is controlled to move while feeding back a measured value of 0. That is, when the suspension beam 12 is given a predetermined inclination angle change, the balance weight 1
The moving amount of 6 is controlled on the basis of the measured value of the tilt sensor 40, so that the suspension beam 12 can be prevented from being rapidly tilted.

In this embodiment, the rear suspension rope 22 is made sufficiently longer than the front suspension rope 18 and the suspension beam 12 is provided.
Is moved to the rear as a whole so that the equalizer 34 of the hoisting and unloading device 14 is brought closer to the vertical lower side of the hook block 26. The length of the central suspension rope 20 is determined by the lengths of the front suspension rope 18 and the rear suspension rope 22, and the center suspension rope is installed in a tensioned state.

In the crane hoisting device 10 of the present embodiment having the above construction, in the initial state of hanging the curtain wall 36 as a hoisting load, the balance weight 16 is lifted as shown by the solid line in the figure. Or position the suspension beam 12 in a substantially horizontal position, or
Alternatively, the balance weight 16 is positioned further forward and the front of the suspension beam 12 is set to be inclined downward.

Next, after suspending the curtain wall 36, the crane is operated to operate the curtain wall 36.
Is lifted up to near the predetermined position where it is to be attached. Then, when the curtain wall 36 is lifted to a predetermined height, the balance weight 16 is controlled to move rearward. Then, in the hanging beam 12, the hook 24 has the hook block 2.
Around the portion hooked on 6, the rear is inclined downward as a whole from the solid line state in the figure to the one-dot chain line state, and the front end portion of the suspension beam 12 where the equalizer 34 is provided, that is, the curtain wall 36 can be moved forward with some upward movement. Therefore, even if an obstacle such as an eave is present above the attachment portion of the curtain wall 36, the curtain wall 36 can be attached without interfering with the obstacle. When the curtain wall 36 is finally attached, the electric cylinder 28 can be operated to finely adjust the height position of the curtain wall 36 so that the curtain wall 36 can be accurately adjusted to the intended attachment position.

As described above, in the crane hoisting device 10 of the present embodiment, the balance beam 16 is moved to incline the suspension beam 12 itself so that the suspension beam 1
Since the curtain wall 36 hung at the front end of 2 is moved forward, the curtain wall 36
It is no longer necessary to change the hanging position in the front-back direction of the hanging beam 12. Therefore, it is not necessary to control the front-back movement of the luggage suspending portion, that is, the equalizer 34, and the movement control of the balance weight 16 only needs to be performed in order to move the curtain wall 36 forward. Therefore, the control of the front and rear movement of the curtain wall 36 can be significantly simplified, and the structure of the control device itself can be simplified.

By the way, in the present embodiment, when controlling the movement of the curtain wall 36, the suspension ropes 18, 20, 2 in which the suspension beam 12 is suspended on the hook block 26 are used.
Of the two, the rear suspension rope 22 is made sufficiently longer than the front suspension rope 18 and the suspension beam 12 is moved rearward as a whole, so that the load suspending portion of the suspending / unloading device 14 is brought closer to vertically below the hook block. The horizontal movement amount L of the load suspending portion when the inclination angle of the suspension beam 12 changes can be made larger than the vertical movement amount H. Therefore, it is possible to secure a sufficient amount of forward and backward movement of the load suspending portion, that is, the curtain wall 36.

[0018]

As described above, in the crane hoisting device of the present invention, at least the front and rear end portions of the hanging beam are hung from the crane through the front suspension rope and the rear suspension rope in a substantially horizontal direction. , The rear suspension rope is made sufficiently longer than the front suspension rope, the suspension beam is moved rearward as a whole, and the load suspending portion of the suspending / unloading device is brought closer to vertically below the hook block. Since the suspended load can be moved forward and backward by the inclination of the suspended beam, the movement control of this suspended load can be significantly simplified, and the horizontal movement amount of the suspended portion when the inclination angle of the suspended beam changes. Can be made significantly larger than the vertical movement amount, so that there is an excellent effect that the front-back movement amount of the load hanging portion can be sufficiently secured.

[Brief description of drawings]

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

[Explanation of symbols]

10 Crane Suspension Device 12 Suspended Beam 14 Suspended Lifting Device 16 Balance Weight 18 Front Suspension Rope 22 Rear Suspension Rope 24 Hooking Device 26 Hook Block 28 Electric Cylinder 34 Equalizer (Load Suspended Part) 36 Curtain Wall (Suspended)

Claims (1)

[Claims] 1. A suspension beam, at least both front and rear ends of which are suspended in a substantially horizontal direction by a crane via a front suspension rope and a rear suspension rope, and a suspended load lifting device provided at the front end of the suspension beam, A balance weight movably attached to the suspension beam, the rear suspension rope being sufficiently longer than the front suspension rope to move the suspension beam rearward as a whole, and the load suspending portion of the suspending / unloading device to the hook block. A crane lifting device characterized in that it is located vertically below.