JP7442946B2 - Lifting magnet device and method for analyzing components of iron-based scrap using the same - Google Patents

Description

The present invention relates to a lifting magnet device and a method for analyzing components of iron-based scrap using the same.

In recent years, with the aim of realizing a carbon-neutral sustainable society, we have shifted from steelmaking technology using the blast furnace method, which is relatively easy to adjust ingredients and suitable for manufacturing high-grade steel, to manufacturing high-grade steel using the electric furnace method, which has lower carbon dioxide emissions. The need for this is increasing. In the electric furnace method, the accuracy of guaranteeing the composition of the iron-based scrap supplied to the electric furnace is an important technical issue that determines whether high-grade steel can be manufactured.

Iron scrap collected in the city may contain garbage from the city. Furthermore, even if the iron scrap comes from a factory, it is difficult to ensure traceability for scrap that is not a product. Therefore, in order to guarantee the composition of iron-based scrap as a steelmaking raw material for electric furnaces, it is necessary to constantly perform composition analysis during sorting.

For this reason, conventionally, component analysis of scrap has been carried out manually using a hand-held fluorescent X-ray analyzer. To do this, the scraps were rearranged so that they could be analyzed manually, mechanically descaled (removed from rust) using a grinder, etc., and a fluorescent X-ray analyzer was pressed against the scraps for analysis. However, it was necessary to handle the scrap after the analysis was completed.

Further, Patent Document 1 discloses that a laser-induced plasma emission type analyzer 1 is fixed above a conveyance line 2 as shown in Figure A, and the scrap being conveyed below is irradiated with a laser beam, and the emission spectrum is detected. An automated device for performing the analysis is disclosed.

Japanese Patent Application Publication No. 2009-52884

However, in the technique of Patent Document 1, scraps must be once loaded into an analysis line and then handled at a predetermined position after the analysis is completed, which poses the same problem as in manual analysis. Furthermore, in order to improve analysis accuracy, it is necessary to stop the transport line 2 at the timing of laser beam irradiation. In addition, since scraps vary in size and shape, the laser must be focused one by one or a long-focus laser must be used, making it difficult to obtain high analytical accuracy. Furthermore, both in the case of manual analysis and in the case of the technique of Patent Document 1, there is a concern that materials with different compositions may be mixed in when handling scrap, and it has been impossible to completely eliminate this concern.

Therefore, an object of the present invention is to provide a technique that can solve the above-mentioned conventional problems and accurately analyze the components of iron-based scrap without fear of contamination with foreign materials.

As a result of repeated studies to solve the above problems, the inventor of the present invention has found that by incorporating a component analyzer into a lifting magnet used for handling iron scrap, there is no concern about contamination of foreign materials, and the analysis accuracy is high. I realized that I could achieve this.

The present invention, which was completed based on the above findings, forms a cavity whose interior is kept under positive pressure in the center of a lifting magnet for handling iron-based scrap, houses a component analyzer, and connects to the cavity. The gist of the present invention is a lifting magnet device characterized in that it is possible to analyze the components of iron-based scrap adsorbed on a lifting magnet through an analysis hole while blowing out purge air from the analysis hole .

Note that it is preferable that the cavity containing the component analyzer also contains a laser oscillator or a mechanical descaling mechanism for performing pre-ablation. Further, the component analyzer can be a laser-induced breakdown analyzer that can perform descaling by dry firing of a laser. Furthermore, the component analyzer can be of two types: a laser-induced breakdown analyzer and a fluorescent X-ray analyzer.

Further, the method for analyzing the components of iron-based scrap according to the present invention includes forming a cavity in the center of a lifting magnet that handles iron-based scrap, the inside of which is kept under positive pressure, and housing a component analyzer and a laser oscillator therein. Purge air is blown out from the analysis hole connected to the cavity to the iron-based scrap adsorbed by the lifting magnet, and the surface of the iron-based scrap is removed from scale by laser irradiation through this analysis hole, and the components of the iron-based scrap are analyzed. The feature is that this is done in real time during handling .

According to the present invention, a component analyzer is housed in a cavity in the center of a lifting magnet used for handling iron-based scrap, and purge air is blown out through an analysis hole formed in the lifting magnet to adsorb the component. Conduct component analysis of iron-based scrap. In this way, the components of the iron-based scrap can be analyzed during handling, so there is no risk of contamination with foreign materials, and the conventional handling process for component analysis can be eliminated. Furthermore, since the distance between the iron-based scrap adsorbed by the lifting magnet and the component analyzer is always constant, high analysis accuracy can be achieved.

In addition, if a laser oscillator or mechanical descaling mechanism that performs pre-ablation is included in the center of the lifting magnet, it will be possible to avoid hot-rolled scale remaining on the scale surface, plating film, or oil coating. Even if they are attached, they can be removed and highly accurate component analysis values can be obtained. Furthermore, if the component analyzer is a laser-induced breakdown analyzer that can be descaled by dry laser firing, a relatively simple structure can be achieved without forming a large cavity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a first embodiment in which the present invention is mounted on an overhead crane. FIG. 3 is a partial cross-sectional view showing the internal structure of the lifting magnet. FIG. 7 is a partial cross-sectional view showing another internal structure of the lifting magnet. FIG. 2 is an explanatory diagram of a second embodiment in which the present invention is mounted on heavy machinery. FIG. 2 is an explanatory diagram of a prior art.

Embodiments of the present invention are shown below.
FIG. 1 is a diagram showing a first embodiment in which a lifting magnet device of the present invention is mounted on an overhead crane, in which 10 is the overhead crane main body, 11 is a club that runs on it, and 12 is a structure below the overhead crane main body 10. This is the driver's cabin where it is located. The club 11 suspends a lifting magnet 15 via a wire rope 13 and a hook 14, and handles iron-based scrap by attracting it to the lifting magnet 15 and moving it.

FIG. 2 shows the internal structure of the lifting magnet 15 for scrap. 16 is a lifting magnet main body, 17 is an external core, 18 is an internal core, and 19 is an excitation coil provided on the external core 17. The lifting magnet 15 is a device that generates magnetic force by passing a current through an excitation coil 19, and handles iron-based scrap by attracting it to its lower surface.

A cavity 20 whose lower part is tapered is formed in the center of the lifting magnet 15 of the present invention, and a component analyzer 21 is housed within this cavity 20. A vibration absorbing material 22 such as foamed resin is filled around the component analyzer 21, and a vibration absorbing spring 23 is arranged below the component analyzer 21. Further, an analysis hole 24 connected to the cavity 20 is formed in the center of the lifting magnet 15, and the detection end 25 of the component analyzer 21 analyzes the components of the adsorbed iron-based scrap through this analysis hole 24.

The diameter of the cavity 20 described above is, for example, about 50 mm, and the diameter of the analysis hole 24 is, for example, about 10 mm. If the diameter of the cavity 20 becomes larger, the electromagnetic resistance will decrease, and there is a concern that the adsorption force will decrease. However, if the diameter of the cavity 20 is about 1/10 of the diameter of the internal core 18, the decrease in electromagnetic resistance can be suppressed to around 1%, and a decrease in the attraction force can be prevented.

In this embodiment, in order to prevent scale and dust from entering the cavity 20 from the analysis hole 24, a small air compressor 26 is installed on the top surface of the lifting magnet main body 16 to maintain positive pressure inside the cavity 20. At the same time, purge air is blown out from the analysis hole 24 to protect the analysis window of the component analyzer 21. Note that 27 is a holding metal fitting provided on the upper surface of the lifting magnet main body 16.

As the component analyzer 21, a fluorescent X-ray analyzer or a laser-induced breakdown analyzer that has been conventionally used for component analysis can be used. A laser-induced breakdown analyzer is an analyzer that uses microplasma generated by applying short pulses of laser light to the surface of an object to be analyzed. This analyzer is excellent in detecting C, Al, Si, Ti, V, Cr, Mn, Ni, Co, Cu, Nb, Mo, and W among the elements contained in iron-based scrap. In particular, C is difficult to detect using fluorescent X-ray analysis. On the other hand, a fluorescent X-ray analyzer is suitable for analyzing Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Se, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Pb, etc. Therefore, the component analyzer 21 needs to select a method depending on the target iron scrap and the type of information to be known. When it is desired to obtain information on many contained elements including C, it is preferable to use two methods: a laser-induced breakdown analyzer and a fluorescent X-ray analyzer.

As described above, the smaller the size of the analysis hole 24, the less the burden on the equipment (reduction in adsorption force), and the more intrusion of scale and dust can be prevented. However, in order to ensure analysis accuracy, in the case of a fluorescent X-ray analyzer, the measurement field of view needs to be a spot with a diameter of 8 mm, so the diameter of the analysis hole 24 needs to be about 10 mm. On the other hand, in a laser-induced breakdown analyzer, the spot size is about 50 μm in diameter, so when used alone, the diameter of the analysis hole 24 can be reduced to about 1 mm.

As shown in FIG. 2, the component analyzer 21 and its control/recording device 30 are connected by a control and power supply cable 31. 32 is an analysis result display monitor, and 33 is a printer. This control/recording device 30 is preferably mounted in the operator's cab 12 of the crane.

FIG. 3 is a partial sectional view showing a state in which a descaler 40 is included in a cavity 20 at the center of the lifting magnet 15 together with a component analyzer 21. As the descaler 40, a laser oscillator that performs preablation is shown in FIG. This laser oscillator descales the iron-based scrap adsorbed by the lifting magnet 15 by firing the laser beam several times, removing hot-rolled scale, plating film, oil coating, etc. remaining on the surface of the scale. This enables highly accurate component analysis. However, the type of descaler 40 is not limited to this, and a mechanical descaling mechanism such as a jet chisel may also be used.

However, when the component analyzer 21 and the descaler 40 are housed inside the cavity 20, it is necessary to increase the size of the cavity 20, which may reduce the adsorption force of the lifting magnet 15. In order to avoid this problem, the component analyzer 21 may be a laser-induced breakdown analyzer that can perform descaling by dry laser firing. With such a configuration, descaling and component analysis can be performed using the same device, so there is no need to increase the size of the cavity 20.

FIG. 4 is a diagram showing a second embodiment in which the present invention is mounted on a heavy machine (back four) 50. The configuration of the lifting magnet 15 is similar to that of the first embodiment. In the second embodiment, the control/recording device 30 is preferably installed in the driver's cab 51 of the heavy equipment 50.

By using the lifting magnet device described above, it is possible to perform component analysis of the adsorbed iron-based scale at the same time as adsorbing and handling the iron-based scale. During adsorption, the surface of the scrap and the adsorption surface of the lifting magnet 15 are almost the same surface with only the surface irregularities of the scrap, so the focus of the laser or fluorescent X-ray can be matched with the surface of the scrap with a high probability, and the analysis Accuracy can be increased.

Note that, after the lifting magnet 15 adsorbs iron-based scrap, it handles it by lifting and turning to the destination location, but it is necessary to complete the analysis within the time required to release the scrap at the destination location. The required time for analysis with a laser-induced breakdown analyzer is said to be 10 seconds, and even in the case of a fluorescent X-ray analyzer, analysis can be done in 10 seconds with the present invention, where the pressure on the scrap is sufficient and the distance is kept constant. It is. According to the applicant's company's experience, the handling time for iron-based scrap using the backfour heavy machinery shown in FIG. 4 is 10 to 17 seconds, so component analysis can be performed within the handling time.

As described above, according to the present invention, the components of iron-based scrap can be analyzed in real time during handling, so there is no need to carry out handling after component analysis as in the past, and concerns about foreign matter contamination can be eliminated. . Furthermore, analysis accuracy can be improved. Therefore, it becomes possible to improve the accuracy of guaranteeing the composition of iron-based scrap to be supplied to the electric furnace, and it becomes possible to meet the needs for manufacturing high-grade steel using the electric furnace method, which emits less carbon dioxide.

1 Analyzer 2 Transport line 10 Overhead crane body 11 Club 12 Cab 13 Wire rope 14 Hook 15 Lifting magnet 16 Lifting magnet body 17 External core 18 Internal core 19 Excitation coil 20 Cavity 21 Component analyzer 22 Vibration absorber 23 Spring 24 Analysis Hole 25 Detection end 26 Air compressor 27 Holding fitting 30 Control/recording device 31 Control and power supply cable 32 Analysis result display monitor 33 Printer 40 Descaler 50 Heavy machinery (back four)
51 Heavy equipment operator's cabin

Claims (5)

A component analyzer is formed in the center of a lifting magnet that handles iron-based scrap by forming a cavity whose interior is kept under positive pressure to house a component analyzer.While blowing out purge air from an analysis hole connected to the cavity, A lifting magnet device characterized by making it possible to analyze the components of iron-based scrap adsorbed on a lifting magnet. 2. The lifting magnet device according to claim 1, wherein the cavity containing the component analyzer also contains a laser oscillator or a mechanical descaling mechanism for performing pre-ablation. 2. The lifting magnet device according to claim 1, wherein the component analyzer is a laser-induced breakdown analyzer capable of descaling by dry firing of a laser. 4. The lifting magnet device according to claim 1, wherein the component analyzer is of two types: a laser-induced breakdown analyzer and a fluorescent X-ray analyzer. In the center of a lifting magnet that handles iron-based scrap, a cavity is formed inside which is kept under positive pressure, and a component analyzer and a laser oscillator are housed inside.
Purge air is blown out from the analysis hole connected to the cavity against the iron-based scrap adsorbed by the lifting magnet, and
A method for analyzing components of iron-based scrap characterized by removing scale from the surface of the iron-based scrap by laser irradiation through the analysis hole and analyzing the components of the iron-based scrap in real time during handling .

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