JPH06273252A - Automatic centroid position detector for long size suspended cargo - Google Patents

Abstract

PURPOSE:To accurately and automatically display a position of the centroid of a suspended cargo such as long size steel. CONSTITUTION:An automatic centroid position detector is composed of a stand 1 on which a long size suspended cargo 2 is loaded horizontally, the first load gauge 3 arranged on one end of the stand 1 so as to measure a load applied to an optional point (A) between the centroid (G) of the suspended cargo 2 and one end of the suspended cargo, the second load gauge 4 arranged on the other end of the stand 1 so as to measure a load applied to an optional point (B) between the centroid (G) of the suspended cargo 2 and the other end of the suspended cargo, a controller 5 having an operation means to carry out operation on a position of the centroid of the suspended cargo 2 according to a distance between the preset point (A) and the point (B) and a display machine 6 to display the position of the centroid of the suspened cargo 2 obtained by the operation of the controller 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically detecting the position of the center of gravity of a long suspended load, and more particularly to a crane for suspending a long suspended load of steel or the like with a crane at one point. The present invention relates to an apparatus for automatically detecting the position of the center of gravity of a suspended load, which is capable of accurately and automatically displaying the position of the center of gravity of the suspended load that is an appropriate hooking position.

[0002]

2. Description of the Related Art Conventionally, when a plurality of long loads such as long steel materials are collectively lifted by one crane hook,
If the center of gravity of the suspended load is accurately found and the crane hook is not hooked at that center of gravity, it will be diagonally suspended and extremely dangerous.

For this reason, in the past, a so-called "trial and error" in which the wires are hung and the wires are reattached,
I was doing slinging work.

[0004]

However, the above-mentioned conventional slinging work has the following problems. That is, it is relatively easy to find the center-of-gravity position when the length of each suspended load is similar, but when the length is different, find the center-of-gravity position. Is difficult even for a skilled person.

Therefore, an object of the present invention is to accurately and automatically display the position of the center of gravity of a suspended load even when the length of each suspended load is different. An object of the present invention is to provide an automatic center-of-gravity position detection device for suspended loads.

[0006]

SUMMARY OF THE INVENTION The present invention is a device for detecting the position of the center of gravity of a suspended load, which is used when a suspended load of a long steel material or the like is suspended by a crane. A gantry that is placed horizontally, and for measuring the load applied to an arbitrary point (A) between the center of gravity (G) of the hung load and one end of the hung load, which is provided at one end of the gantry. A first load cell and a first load meter provided on the other end of the gantry for measuring a load applied to an arbitrary point (B) between the center of gravity (G) of the suspended load and the other end of the suspended load. 2 load cells, the load measurement results by the first load cell and the second load cell, and the suspended load based on a preset distance between the point (A) and the point (B). And a controller having a calculation means for calculating the center of gravity of the load, and the center of gravity of the suspended load calculated by the controller is displayed. Those having features to be composed of the order of the display device.

[0007]

According to the present invention, the position of the center of gravity can be calculated easily and reliably by measuring the loads applied to two points on both sides of the center of gravity of a suspended load such as a long steel material.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an automatic center-of-gravity position detecting apparatus for a long suspended load of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view showing an embodiment of an automatic center-of-gravity position detecting device for a long suspended load according to the present invention, FIG.
FIG. 3 is a schematic side view showing one embodiment of an automatic center-of-gravity position detecting device for a long suspended load of the present invention, and FIG.
FIG. 4 is a block diagram showing an embodiment of an automatic center-of-gravity position detecting device for a long suspended load, and FIG. 4 is a principle diagram of an automatic center-of-gravity position detecting device for a long suspended load according to the present invention.

In FIGS. 1 to 4, reference numeral 1 is a pedestal having a substantially U-shaped arm 1A, 1B at both ends, on which a long load 2 such as a long steel material is horizontally mounted, and 3 is a pedestal 1 One arm
The first load cell 4 provided at 1A for measuring the load (W ₁ ) applied to an arbitrary point (A) between the center of gravity (G) of the suspended load 2 and one end of the suspended load 2 is The first arm provided on the other arm 1B of the gantry 1 for measuring a load (W ₂ ) applied to an arbitrary point (B) between the center of gravity (G) of the suspended load 2 and the other end of the suspended load 2 2 load cell, 5 is based on the load measurement result from the first load cell 3 and the second load cell 4, and the distance (L) between the preset point (A) and point (B), A controller for calculating the position of the center of gravity (G) of the suspended load 2 according to the calculation formula described later and issuing a command to the display device described later, and 6 is the center of gravity of the suspended load 2 according to the command from the controller 5. It is a display device that can be moved to a position along the gantry 1.

As shown in FIG. 2, the first load cell 3 includes a load cell 7 fixed to one side surface of the gantry 1, a wire 9 fixed at one end to the load cell 7 via a pulley 8, and a wire 9. A screw jack 10 fixed to the other end,
It is composed of a motor 11 for driving the screw jack 10. When the motor 11 is rotated, the screw jack 10 causes the wire 9 to be wound up against the load of the hanging load 2 placed on the wire 9, and the pulling force of the wire 9 at this time, that is, the hanging load 2. The load at point (A) is measured by the load cell 7. Second load cell 4
Since the structure of is the same as that of the first load cell 3, the description is omitted. The structures of the load cells 3 and 4 are not limited to those described above as long as they can measure loads at predetermined positions on both sides of the center of gravity (G).

As shown in FIG. 3, the controller 5 comprises an interface 12, a CPU 13 and a controller 14. The calculation performed by the CPU 13 of the controller 5 will be described with reference to FIG. In Fig. 4, W ₁ : load on point (A) of suspended load 2, W ₂ : load on point (B) of suspended load 2, W ₁ + W ₂ : load on center of gravity (G) of suspended load 2 , L ₁ : the distance between the point (A) and the center of gravity (G), l ₂ : the distance between the point (B) and the center of gravity (G), L: the distance between the points (A) and (B) Distance between (constant). From the principle of left-right balance based on the center of gravity (G),
Equation (1) holds. W ₁ l ₁ = W ₂ l ₂ --- (1) From the formula (1), l ₁ = L / (1 + W ₁ / W ₂ ) --- (2) l ₂ = L −l ₁ --- (3) The CPU 13 calculates the position of the center of gravity (G) of the suspended load 2 according to the above equations (2) and (3).

The calculation result indicating the position of the center of gravity of the suspended load 2 thus obtained is sent to the display 6. Display 6
Is composed of a carriage 15 that moves along the gantry 1 in accordance with a command from the controller 5. The carriage 15 travels to a predetermined position according to a command from the controller 5 and stops. The position of the center of gravity (G) of the suspended load 2 is indicated by the stop position of the carriage 15.
In addition to such a trolley type display device, the display device 6 is a type in which the calculation result by the controller 5 is digitally displayed and read by a slinging operator, or based on the calculation result by the controller 5. Alternatively, the electronic display means arranged along the gantry 1 may be turned on.

According to the present invention having the above structure,
According to the apparatus for automatically detecting the center of gravity of a long load, the position of the center of gravity of the load 2 is automatically displayed simply by placing the load 2 on the gantry 1. Of course, the length of the suspended load 2, the number of suspended loads 2, etc. are not affected.

[0015]

As described above, according to the present invention, since the position of the center of gravity of the suspended load is obtained by calculation, the suspended load is not affected by variations in the length of each suspended load, the number of suspended loads, and the like. This has a useful effect that the position of the center of gravity of the load can be displayed accurately and automatically.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of an automatic center-of-gravity position detecting apparatus for a long suspended load of the present invention.

FIG. 2 is a schematic side view showing an embodiment of an automatic center-of-gravity position detection device for a long suspended load of the present invention.

FIG. 3 is a block diagram showing an embodiment of an automatic center-of-gravity position detecting device for a long suspended load of the present invention.

FIG. 4 is a principle view of an automatic center-of-gravity position detection device for a long suspended load according to the present invention.

[Explanation of symbols]

 1: Frame, 1A, 1B: Arm, 2: Suspended load, 3: First load cell, 4: Second load cell, 5: Controller, 6: Display, 7: Load cell, 8: Pulley, 9: Wire , 10: screw jack, 11: motor, 12: interface, 13: CPU, 14: controller, 15: dolly.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kozo Amada 1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (1)

[Claims] 1. A center-of-gravity position detection device for a suspended load such as a long steel material, which is used when a suspended load is suspended by a crane, and a platform on which the suspended load is horizontally mounted. , The center of gravity of the suspended load provided at one end of the frame
(G) and a first load cell for measuring a load applied at an arbitrary point (A) between the suspended load and one end of the suspended load, and a center of gravity of the suspended load (G ) And the other end of the suspended load, a second load cell for measuring a load applied to an arbitrary point (B), a load measurement result by the first load cell and the second load cell, and Based on a preset distance between the point (A) and the point (B), a controller having a calculating means for calculating the position of the center of gravity of the suspended load, and the controller calculated. An automatic center-of-gravity position detection device for a long suspended load, comprising a display for displaying the position of the center of gravity of the suspended load.