JPH11139749A - Double hanging preventing method of lifting magnet crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double hanging preventing method of a lifting magnet crane used in piling work of on/off loading, reloading, etc., of a steel plate or the like. SOLUTION: In the case of performing piling work of on/off loading, reloading, etc., of a steel plate piled together by using a lifting magnet 3, in a sheave shaft of a lifting magnet hoist beam, a load cell is assembled, by comparing measured weight of a steel plate hoisted up with weight information of a host computer of this steel plate, double hanging is judged for whether provided or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing a lift of a riff mag crane used for unloading and unloading of steel plates and the like and for piling operations such as transshipment.

[0002]

2. Description of the Related Art Conventionally, unloading and transshipment work of steel sheets and the like using a lift mag crane has been dependent on the visual inspection of a crane operator, and the steel sheets are piled and suspended, that is, under a large-sized steel sheet. Often small steel plates were lifted together.

A method of changing the number of suspended steel sheets by adjusting the magnetic force of a rifmag is disclosed in Japanese Patent Application Laid-Open No. 52-141.
No. 949 discloses that a lifting metal is used to carry an electromagnet by a crane using a crane to an appropriate position so as not to cause an eccentric load on the target steel sheet. A method is disclosed in which a movable iron core is pulled up, a collar is inserted, and after being separated from a steel plate, a current is supplied to an exciting coil to adsorb the steel plate and a required number of steel plates are piled up and suspended, and Japanese Patent Application Laid-Open No. 55-161177 is disclosed. Discloses a method in which a plurality of counter electrode type electromagnets are arranged to have the same magnetism and the magnetic material is efficiently suspended to the lowermost stage of the steel sheet to increase the attraction force, thereby suspending the magnetic material.

[0004]

However, in these methods, the number of lifted steel plates having substantially the same size and thickness is adjusted, and various sizes of steel plates, that is, large-sized steel plates are used. If a small steel plate is to be suspended under the slab, the magnetic force of each electromagnet must be changed in various ways. Further, for example, in order to prevent a small-sized steel plate from being suspended under a large-sized steel plate, it is necessary to make all the rif-mag magnetic forces completely match the number of lifted steel plates, that is, to make the magnetic force with no margin at all. Therefore, the above-described method has a problem that it cannot be applied to prevent the steel sheets from being hung from the standpoint of the risk of falling of the steel sheet during the handling of the steel sheet and the complexity of adjusting the magnetic force.

[0005] Further, in the piling work of the riff mag crane, it is difficult for the crane operator to find the pile suspension of the steel sheet, and as a result, unexpected handling of the steel sheet is caused, which is a major cause that deteriorates the tracking accuracy of the steel sheet. In addition, the tracking correction that corrects this tracking has reduced the handling efficiency. For this reason, there has been a problem that it is necessary to arrange a receiving observer in each process and visually check the handling steel plate.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and proposes a very simple method for preventing a pile of a riff mag crane which can be applied to a conventional crane. When carrying out pile operations such as unloading and reloading of steel sheets stacked using a riff mag, a load cell is installed on the sheave axis of the riff mag suspension beam, and the measured weight of the lifted steel sheet and the weight of the host computer of the steel sheet This is a method of preventing the suspension of a lift mag crane in which the presence or absence of suspension is determined based on comparison with information.

Accordingly, the present invention has the advantage that the tracking accuracy is improved by the reliable prevention of overlapping suspension, a monitoring person is not required in each process, and the piling work of the riff mag crane is automated and labor is saved. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the entire configuration of a steel plate tracking system in which a method for preventing a rif mag crane from being overlaid according to the present invention is shown. FIG. 2 shows details of a load cell installed on a rif mag mounting beam. FIG. 3A is a front view, and FIG. 3B is a side view.

First, the physical distribution in the refining process is not a continuous flow in one direction, but the branching and joining of the steel plate frequently occurs between the main line and the offline of a certain specific line in each process. Everything is automated. That is, information from the rolling line, for example, information on various properties, physical properties, location, and the like of the steel sheet, is all managed by the refining management computer for the purpose of tracking the steel sheet and controlling the physical distribution throughout the refining process. This is specifically shown in FIG.

In FIG. 1, a steel sheet 8-1 sent from a rolling line enters a refining process on a transfer table 17, and
It is placed at a predetermined position by the position detection sensor 18. The detected steel sheet position is used as the real-time position tracking management information of the steel sheet 8-1 on the transfer table 17, and various characteristics of the steel sheet already transmitted from the rolling line,
The information is stored in the refinement control computer 13 together with the physical characteristics, and the operator who manages each logistics management process is C
It is sequentially managed on the screen of RT14. The instructions issued from the logistics management process are updated via the ground station 12, the ground antenna 11, and the on-board antenna 10 in the pile crane terminal 9 installed in the pile crane operation room 15, and a plurality of lift magnets are updated. The hoisting drum 6 of the piling crane 1 that supports the rif-mag attachment beam 2 to which the steel plate 3 is attached is hoisted to lift the steel plate 8-1. 2a and 2b, a sheave shaft 16 is provided on a sheave mounting bracket 5 mounted on the riff mag mounting beam 2 to support the hoisting sheave 4 at an intermediate position between the piling crane 1 and the rif mag mounting beam 2. doing. The sheave shaft 16 and the winding sheave 4
A load cell 7 for measuring the weight of the steel plate is disposed between the steel plate 8 and the steel plate 8-
The weight information of (1) is fed back to the refinement control computer 13 via the crane terminal 9.

The steel plate 8 fed back as described above
The weight information of No. 1 is already sent from the rolling line, and a comparison operation is performed with various information of the steel plate 8-1 stored in the refinement control computer 13. If a dissimilar material that cannot be visually discriminated, for example, a small-sized steel plate is lifted together under the steel plate 8-1, the refinement control computer 13
In this case, the weight comparison value is different, and the cause can be immediately found and eliminated based on the weight abnormality information.

Further, the pile distribution (stacking of products) operation by the pile crane 1 is performed in a steel plate stock yard (not shown) accurately in accordance with the product shipment schedule for the same type and the same size for each same type and size. It is necessary to manage the mountain appearance that was done. This management is for the crawling crane 1
By installing the crane position detection sensor 19 provided at the upper part, it is possible to manage the accurate mountain distribution and the stacked mountain shape of the steel sheet based on mutual information with the refinement management computer 13.

[0013]

As described above, the method for preventing the suspension of a lift mag crane according to the present invention makes it possible to completely prevent the dissimilar material from entering the next process by improving the tracking accuracy of the steel plate, thereby improving the handling efficiency. It is also possible to reduce the number of supervisors who monitor each process.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a steel plate tracking system in which a method for preventing a lift of a lift mag crane according to the present invention is implemented.

FIGS. 2A and 2B are diagrams showing details of a load cell installed on a riff mag attachment beam in FIG. 1, wherein a is a front view thereof and b is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piling crane 2 ... Rif mag attachment beam 3 ... Rif mag 4 ... Hoisting sheave 5 ... Sheave attaching bracket 6 ... Hoisting drum 7 ... Load cell 8-1 ... Steel plate 8-2 ... Dissimilar material 9 ... Crane terminal 11 ... Aircraft station antenna 12 ... Ground station antenna 13 ... Refinement control computer 14 ... CRT 15 ... Operator cab 16 ... Sheave shaft 17 ... Transport table 18 ... Steel plate position detection sensor 19 ... Crane position detection sensor

Claims (1)

[Claims] When performing a pile operation such as unloading and reloading of steel sheets stacked using a rif mag, a load cell is incorporated into a sheave shaft of a rif mag suspension beam, and a measured weight of the lifted steel sheet and a higher rank of the steel sheet. A method for preventing the suspension of a lift mag crane, wherein the presence or absence of suspension is determined by comparing with the weight information of a computer.