KR20150123513A - Scrap metal sorting device - Google Patents

Abstract

The present invention relates to a metal scrap classifying apparatus capable of classifying metal scrap by laser spectrum analysis according to a component, and comprising: a metal scrap insert part (10); a transfer part (20) for transferring metal scrap inserted by the metal scrap insert part (10) along a transfer line, and having a through area (T) for irradiating a laser; a laser analysis part (40) arranged in the lower part of the transfer part (20), having a laser head (42) for irradiating a laser to metal scrap through the through area (T), and for analyzing a component of a sample as the irradiated plasma is an excited source; a pressing part (30) prepared in the upper part of the transfer part (20) while facing the laser head (40), for pressing metal scrap horizontally transferred and guiding in the transfer direction; a classify part (50) for classifying metal scrap transferred along the transfer line; and a control part for classifying metal scrap by controlling the classify part (50) according to a component of metal scrap detected from the analysis part (40). The present invention has an effect of providing a metal scrap classifying apparatus capable of accurately focusing a laser beam irradiated to metal scrap in the various forms during transfer to the surface of metal scrap without vibration.

Description

Scrap metal sorting device

The present invention relates to a metal scrap classifying apparatus, and more particularly, to a metal scrap classifying apparatus equipped with a means for preventing vibration of a metal scrap so that laser spectroscopy can be smoothly performed during transportation of the metal scrap.

Zirconium (Zr) metal has similar mechanical properties and thermal conductivity to titanium metal (Ti) metal material, and it has better corrosion resistance than any metal material and therefore has excellent corrosion resistance even in acidic or alkaline environment. Materials, synthetic fibers, and textile chemical industries. In particular, by adding elements such as Sn, Nb, Fe, Cr, Ni and Cu, alloys with improved corrosion resistance and mechanical properties can be obtained as compared with pure zirconium. These zirconium alloys are suitable for reactor core materials because of their small neutron absorption cross section and compatibility with uranium dioxide (UO2) used as nuclear fuel. Because of this feature, zirconium alloys are used as fuel cladding, guide pipe, support grid and pressure tube for light and heavy water reactors. The most commonly used field is the nuclear fuel cladding. The use of zirconium metal materials is expected to increase because domestic energy demand and energy production using nuclear power are likely to increase in the future.

More than 70% of the zirconium alloys used in the nuclear industry are used as parts of nuclear fuel cladding. In order to produce nuclear fuel cladding in Korea, imported zirconium alloy (TREX) from abroad is manufactured at a high price, and is produced as cladding through molding, cleaning, heat treatment, and processing. In this cladding process, more than 40 tons of zirconium scrap are produced annually, and the amount of scrap (tubes) in the tube forming process accounts for 80% of the total. Scrap volumes are expected to increase to more than 80 tons per year due to the expansion of production capacity in the future. Recycling of scrap metal of this metal is of high value considering that it is expensive metal but can be limited production because of technological and environmental difficulties of smelting process.

Therefore, in order to recycle metal scrap, it is necessary to process the metal scrap according to the component. FIG. 1 shows an apparatus and a method for sorting fine non-ferrous metals and pieces of insulated wires proposed in the prior art publication No. 10-2009-0057937 (published on June, 2009). The schematic configuration includes a conveyor belt 221 for conveying mixed material pieces 103 and 105 and a conveyor belt 221 positioned proximate the upper surface of the conveyor belt 221 across the width of the conveyor belt 221, An array of inductive proximity sensors 207, 209 that emit a magnetic field and produce electrical signals when the metal pieces 105 are detected in the magnetic field, and an array of inductive proximity sensors 207, Wherein the controller includes a controller coupled to the proximity sensors proximate to the plurality of inductive proximity sensors when the controller receives the electrical signals for detected metal fragments, The controller commands the separating unit 217 to separate the metal pieces 105 detected by the separating unit 217 from the mixed material pieces.

The above-mentioned prior art is advantageous in that it is possible to perform non-contact detection and classify it as a continuous process. However, since it is a method to detect by heat loss due to induction current, it is impossible to detect a base metal that does not flow current, and metal which does not flow current, such as ferrite, even if it is metal, can not be detected and component analysis is performed by an indirect method. There are limits to applying to the same class of alloys.

In order to overcome these limitations, measurement techniques that can be applied in critical environments such as high radiation and high temperature environment, without contamination of measurement equipment, and with accuracy of chemical analysis method are required. As a new quantitative measurement technique, the use of Laser Induced Breakdown Spectroscopy (LIBS), which enables quantitative analysis of samples in real time at the process site, is emerging.

LIBS is an elemental analysis technique based on laser spectroscopy. When a high-power laser beam is irradiated on the surface of a sample through a lens, a local plasma is generated on the surface of the sample, and a part of the sample is evaporated, atomized and ionized. When a certain period of time elapses, the excited plasma interacts with the surrounding gas to release energy and return to the ground state again. In this case, the emission energy is emitted as a light energy of a unique wavelength depending on the kind of the element and the excited state. By comparing the emitted energy with the characteristic signal (transition line) inherent to each element obtained using the standard sample, It is a technology that enables qualitative analysis and quantitative analysis.

Since the LIBS analysis measures independent characteristic signals (peaks) for each element, it is possible to simultaneously measure various elements in one sample and to confirm the results in real time, and the structure is relatively simple, Is relatively easy to install and is relatively inexpensive to install.

However, the LIBS analysis is disadvantageous in that the fluctuation of the plasma induced by the laser is very severe and it is difficult to optimize the measurement conditions because it is sensitive to the surrounding environment. Therefore, there is a demand for a device capable of performing laser analysis in real time while suppressing vibration while the metal sorting process continues without stopping.

A conventional metal scrap sorting system is disclosed in US Pat. No. 6,795,179 (registered on September 21, 2004), which is shown in FIG.

2, the metal scrap is irregularly arranged on the conveyor. The metal scrap is detected by detecting the shape and arrangement direction of each scrap particle, irradiating the laser beam with an angle corresponding thereto, and detecting and classifying the respective components. This is a description of the classification process. When the shape and the direction are irregular, conventionally, it has been difficult to design a process for classifying by continuous operation. However, the prior art of FIG. 2 realizes this through a rather complicated lens and sensor system.

However, in the prior art of FIG. 2, in order to obtain a uniform signal in a state where metal scrap having various shapes and sizes are irregularly arranged, a considerable number of parts of the pre-sensors for laser irradiation and condensing system and focusing are required And a large-capacity controller in which the angles of the individual reflectors are individually adjusted is required, which is costly and difficult to maintain.

Further, in the prior art shown in Fig. 2, the motor vibration, which is essentially accompanied by the conveyor, is directly transmitted to the metal scrap to be irradiated with the laser, and the structure for weakening the vibration is not exhibited at all. There is a problem that a lot of noise is intervened in the inspection result.

Therefore, there is a demand for an anti-vibration technique of metal scrap that can precisely and excellently utilize laser spectroscopy in metal scrap, while dramatically increasing the accuracy of the inspection result, It is necessary to be able to prevent vibration during the classification process.

Open Patent Publication No. 10-2009-0057937 (Published date: 2009.06.08)

US Patent No. 6,795,179 (registered on September 21, 2004)

Accordingly, it is an object of the present invention to provide a metal scrap sorting process by laser spectroscopy which can prevent the vibration of metal scrap and enable precise focus formation.

In order to accomplish the above object, a basic structure of a scrap metal scrapping apparatus according to the present invention is a scrap metal scrap injecting unit and a metal scrap injected by a metal scrap injecting unit, A laser analyzer for analyzing the components of the sample by using the emitted plasma as an excitation source, the laser analyzer being disposed at a lower portion of the transfer section and having a laser head for irradiating the metal scrap with laser through the penetration area, A pressurizing portion provided on an upper portion of the conveying portion so as to face the head to press the metal scrap which is horizontally conveyed and to guide the metal scrap in the conveying direction, a sorting portion to sort the metal scraps conveyed along the conveying line, Controlling the classifying section in accordance with a component of the scrap metal, And a controller for classifying the genuine scrap.

Here, the conveying unit includes a horizontal zone in which the flat metal scrap is placed and an inclined zone in which the tubular metal scrap is seated. In this case, the horizontal zone in the width direction cross section of the conveyance unit is located at both ends, Is positioned between the horizontal zones, and the inclined zone has a wedge shape with an acute angle directed downward. In particular, the inclined zone is characterized by being a V-shaped conveyor connecting opposite points on both ends of the horizontal section.

The through-hole is formed at the lowermost part of the inclined area in the direction of conveying the metal scrap, and the width of the through area is smaller than the width of the tubular metal scrap.

The contact member, which is in contact with the metal scrap in the pressing portion, is preferably a plate spring or a rotating roller. The pressing portion may further include a lifting mechanism for adjusting the height of the contact member, And in the case of tubular metal scrap, its height is adjusted.

Particularly, since the contact member and the lifting mechanism are coupled by the hinge shaft, even if the shape of the metal scrap is the same, when the thickness is different, the height of the contact member of the pressing portion is autonomously height- .

The metal scrap sorting apparatus according to the present invention has the following advantages.

First, by adopting the pressing portion at the upper part of the laser irradiation point, the accuracy of the focus at the laser irradiation point can be remarkably increased, and the fluctuation of the excitation source of the plasma can be minimized.

Secondly, according to the shape of the metal scrap, it is possible to convey the laser beam at different positions on the conveying part, and it is possible to press the pressing part at an accurate laser focus position even if the shape of the elevating mechanism is different, The accuracy of the focal point of the irradiation point can be obtained.

Thirdly, when the plate spring or the roller is used as the contact member for contacting the metal scrap in the pressurizing portion, it is possible to pressurize during movement of the metal scrap, thereby realizing high speed and mass production of the process.

FIG. 1 is a view showing a conventional metal separator using an induction current,
Figure 2 shows a prior art metal scrap sorting system,
3 is a perspective view showing a metal scrap classifying apparatus according to the present invention,
4 is a front view showing a metal scrap classifying apparatus according to the present invention,
5 is a conceptual view showing a pressurizing portion and a conveying portion of the metal scrap classifying apparatus according to the present invention,
FIG. 6 is a side view and a front view of a pressing portion in the metal scrap classifying apparatus according to the present invention,
FIG. 7 is a side view and a front view showing an inclined region front end drive roller in a transporting portion of the metal scrap classifying apparatus according to the present invention,
FIG. 8 is a side view and a front view showing an inclined region rear end drive roller in a transport section of the metal scrap classifying apparatus according to the present invention,

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view illustrating a metal scrap sorting apparatus according to a preferred embodiment of the present invention.

The metal scrap sorting apparatus according to the present invention is a device for implementing a process for sorting metal scrap according to a component. The apparatus includes a metal scrap charging unit 10, which is a starting point of the process, And a laser which irradiates a laser to the metal scrap through the penetration area (T), which is disposed under the transfer part (20), and a transfer part (20) A laser analyzer 40 for analyzing the components of the sample by using the emitted plasma as an excitation source and a head 42 provided at an upper portion of the transport unit 20 so as to face the laser head 42, (50) for sorting the metal scraps transported along the transfer line, and a detection unit (40) for detecting in the analysis unit (40) Therefore, the components of the metal scrap comprises a control unit that is to classify the metal scrap by controlling the classification unit 50.

Here, the penetration area T is not shown in FIG. 3 but is shown in FIG. 5 is a conceptual diagram showing an interaction relationship between the transferring unit 20, the pressing unit 30, and the analysis unit 40, which will be described later.

Looking more closely at each of the detailed configurations,

First, the charging portion 10 is a place where various shapes of metal scraps are supplied to the sorting process, and there is no limitation on the supply manner. The supply can be done manually by the operator or automatically by the automatic dispenser. In one embodiment of the charging unit 10 shown in Fig. 3, a cylinder charging apparatus is shown in which a plate-like metal scrap is supplied from the side of the line and a tubular metal scrap is supplied at the starting point of the line in the longitudinal direction. At this time, in order to enable laser analysis, it is preferable that two or more metal scraps are stacked one at a time and supplied at a predetermined interval.

The transfer unit 20 will be described with reference to the entire plan view of FIG. 4 and the conceptual view shown in FIG. The conveying part is a part for conveying the metal scrap to each step, and all the steps are connected. There is no particular limitation on the means of conveying the metal scrap. The conveying part may be constituted by a conveyor belt as shown in FIGS. 4 and 5, It may be in the form of a conveyor roller driven by a belt.

5, the conveying unit 20 is divided into a horizontal section 21a on which a flat metal scrap is placed and an inclined section 21b on which a tubular metal scrap is placed on a sectional structure. More specifically, The horizontal section 21a is located at both ends in the widthwise vertical section of the conveying section 20 and the inclined section 21b is located between the horizontal sections 21a at both ends and the inclined section 21b is located at the center thereof A penetrating area T positioned below the horizontal area 21a and both inclined surfaces facing the penetrating area T in the center at both opposite points of the horizontal area 21a. At this time, the width of the penetration area T is smaller than the cross-sectional diameter of the tubular metal scrap.

Although not shown in detail, a conveyor constituting the horizontal section 21a and a conveyor constituting the inclined section 21b are both driven by a stepping motor having a combined dustproof structure and a speed reducer attached thereto. 7 and 8 show the front drive roller 22 and the rear drive roller 23 for driving the conveyor constituting the inclined section 21b. The inclined region 21b has a shape similar to a kind of a v-shaped conveyor. The center of the inclined region 21b is separated from the inclined plane due to the penetrating region T, and each inclined surface is inclined by the inclined rollers on both sides of the drive rollers 22 Respectively.

The analysis unit 40 is located at the lower part of the transfer unit. The analysis method is a laser induced plasma analysis, which is a method of irradiating a sample with a high-power energy pulse laser, which is an excitation source of laser induced resolution spectroscopy, . The analyzing unit 40 is preferably a solid state laser system using Nd: YAG crystals. Although not shown, the analyzing unit 40 includes a laser generator and a plasma generator for irradiating the laser to the metal scrap and analyzing the components of the sample qualitatively and quantitatively And a position adjuster 41 that automatically adjusts the focal distance of the laser generator and the spectroscope to produce an optimum condition.

5, the position adjuster 41 includes position adjusting means (not shown), a focusing lens 43 and a collecting lens (not shown), and the collecting lens is coupled to the end of the optical fiber head (not shown) 5 schematically shows the position adjuster 41, the laser head 42 and the focusing lens 43. In FIG. 5, the focusing lens 43 and the laser head 42 are separated from each other. However, the focusing lens 43 is preferably integrally coupled to the laser head 42, And that the combined focusing lens 43 and the laser head 42 can be moved up and down together by the position adjuster 41. FIG.

The pressing portion 30 minimizes the vibration transmitted from the conveying portion 20 when the laser is irradiated to the metal scrap being conveyed, while the laser is irradiated so that the portion of the metal scrap subjected to the laser irradiation is kept unchanged And serves to press the metal scrap onto the transfer unit 20 at the upper part which is the opposite side of the receiving part. 6, the pressing portion 30 includes a contact member 31 which is brought into direct contact with the metal scrap to press the metal scrap, and an elevating unit 30 which moves the position of the contact member 31 up and down according to the shape of the metal scrap. And a hinge shaft 33 for hinge-connecting the spherical member 32 and the contact member 31 and the elevating mechanism 32.

4, the classifying unit 50 is divided into different containers for each component of the metal scrap according to the analysis result of the analyzing unit 40. The tubular metal scrap is preferably disposed on the rear stage driving roller 23, Shaped metal scrap container moving vertically downward at a point of time when it passes through a plurality of tubular metal scrap containers moving at right angles to the transport direction. The flat metal scrap is loaded on each of the flat metal scrap containers 52 and 53 according to the analysis result of the analyzer 40.

Although not shown, when the components of the metal scrap are analyzed by the analysis unit 40, the control unit controls the classification unit 50 so that the metal scrap can be classified into the same kind of components according to the analysis results.

Hereinafter, how each of the above-described structures works together will be described in detail.

Referring to FIGS. 3 and 4, the metal scrap is first sorted into a tubular shape and a flat plate shape by the shape of the input portion 10 at first. This sorting process is not shown, but may be performed on an automatic machine or manually by an operator. The preferred embodiment of FIG. 3 illustrates a feeder that feeds the selected metal scrap to the metal scrap classifying process. Here, the operator or automatic metal scrap separator should be supplied at regular intervals when supplying metal scrap to the feeder. If the scraps are partially overlapped or attached to each other, there is a possibility that two adjacent metal scraps will be recognized as one metal scrap in the analyzing unit 40 to be passed later.

When the metal scrap is sorted into a tubular shape and a flat plate shape at the input portion, it is preferable that the process is separately performed for each selected shape. This is to increase the accuracy of the measurement rather than the scrap of different shapes being put into the process together. This will be described below.

The metal scraps thus fed are conveyed to the respective processes by the conveying unit 20. The transfer unit 20 preferably comprises a drive unit for driving the conveyor and the conveyor, and a table or frame for supporting the conveyor and the drive unit. Here, as described above, the shape of the conveyor comprises a horizontal section 21a on both sides and an inclined section 21b toward the lower part of the center between the horizontal sections. The flat metal scrap is seated across the horizontal zones 21a on both sides. The tubular metal scrap is seated in the inclined section 21b so that the longitudinal direction of the tubular metal scrap coincides with the conveying direction. At this time, the bottom surface of the tubular metal scrap becomes the center of the inclined section 21b, and a penetration area T is formed in the longitudinal direction at the center thereof. The width of the penetration area T is smaller than the cross- So that the scrap can be continuously transferred without falling into the penetration area (T).

The metal scrap is passed over the analysis unit 40 by the transfer unit 20. The analyzer 40 adopts the laser induced discharge spectroscopy (hereinafter, referred to as LIBS) method and the laser head 42 is positioned vertically below the penetration area T of the transfer unit 20. [ The high-power laser beam irradiated for the component analysis in the laser head 42 passes through the penetrating region T to reach the bottom surface of the metal scrap, and a plasma is emitted in which bright light is emitted from the portion where the laser beam hits, Is vaporized and atomized and ionized, and atoms and ions are excited by the energy absorbed by the laser. The atoms and ions in the excited state emit energy after a certain period of time and return to the ground state. At this time, the emitted energy emits intrinsic wavelength depending on the type of the element and the excited state. ) To be collected into an optical fiber head and analyzed by spectroscopy.

At this time, the analysis of the sample using LIBS is very difficult to optimize the measurement conditions because the laser induced plasma is very vigorous and is sensitive to the surrounding environment. Therefore, the influence of the ambient vibration should be maximized. The metal scrap, which is the object to be irradiated with the laser beam, is not shaken and the angle between the laser beam and the surface of the metal scrap needs to be fixed. Therefore, in order to ensure the accuracy of the measurement, a pressing means for bringing the metal scrap into close contact with the conveyor surface of the conveying unit 20 is required. The pressing portion 30 takes this role.

The position of the contact member 31 which directly contacts the metal scrap and presses the metal scrap in the pressurizing portion 30 must be controlled by the laser head 42 In the vertical direction. At this time, the metal scrap is passed between the laser head 42 and the contact member 31.

Particularly, since the contact member 31 of the pressing portion 30 presses the metal scrap being transported, not the metal scrap in the stopped state, the metal scrap should be prevented from being transported even if the metal scrap contacts during transportation of the metal scrap do. Thus, the contact member 31 is preferably in the form of a leaf spring or a roller so that the influence of friction on the metal scrap being conveyed can be minimized.

FIG. 5 is a conceptual diagram showing a state in which the contact member 31 presses the metal scrap at the moment when the laser beam is irradiated to the metal scrap. 5, the flat metal scrap is depressurized. When the tubular metal scrap is fed, the longitudinal direction is conveyed at the center of the slope section 21b in a manner that the longitudinal direction coincides with the conveyance direction, so that the height thereof becomes lower than the height of the horizontal section 21a at both ends. Therefore, the height of the contact member 31 in Fig. 5 should be lowered from the horizontal region 21a at both ends. The height of the contact member 31 is regulated by the lifting mechanism 32. A preferred embodiment of the elevating mechanism 32 is as shown in Fig. Even if the shape of the metal scrap is changed by the elevating mechanism 32, the work can be continued without replacing the contact member 31.

At this time, as described above, if the tubular metal scrap and the flat metal scrap are alternately transported alternately, the frequent operation of the lifting mechanism 32 can affect the focusing of the laser beam accurately. Therefore, it is preferable that the metal scrap sorted according to the shape before the work is inputted to only one of the tubular shape and the flat plate shape so that the height of the contact member 31 can be set in advance by the elevating mechanism 32 before the work do. The distance between the focusing lens 43 and the laser head 42 by the position adjuster 41 can also be set to correspond to a predetermined metal scrap shape in advance. However, it is also possible to shorten the process of sorting the metal scrap into a tubular shape and a flat-plate shape, and to put the tubular shape and the flat metal scrap together into the classification process. However, in order to ensure the accuracy of the selection, the process is preferably performed for any one of the tubular shape and the flat plate shape.

Further, the thickness of metal scraps of the same shape may be different from each other. For example, flat metal scrap may have different thicknesses, and tubular metal scrap may have different cross-sectional diameters. In this case, if the height variation of the contact member 31 is not allowed and fixed, it will not be possible to evenly press the metal scrap with different thicknesses. The contact member 31 is coupled to the elevating mechanism 32 and the hinge shaft 33 so that the height of the contact member 31 can be freely adjusted according to the thickness of the metal scrap. 6 is a schematic diagram in which the contact member 31 is varied around the hinge axis according to the thickness of the scrap metal.

In the case of a tubular metal scrap, in order to perform smooth spectral analysis, the extension line of the laser beam and the center line of the scrap measurement surface, that is, the vertical line passing through the center of the cross section must be aligned. In the case of the flat metal scrap, It is preferable that the measurement plane of the first and second planar surfaces forms a right angle.

However, when the shape of the metal scrap is changed, that is, from a flat plate type to a tubular shape, or from a tube type to a flat plate type, a focusing lens, which focuses the laser beam irradiated by the laser head 42, The position of the collecting lens (not shown) which allows the light beam 43 and the emitted light to be accurately collected on the optical fiber head (not shown) must also be changed. The position adjuster 41 changes the position of the focusing lens 43 and the collecting lens (not shown).

5 schematically shows the position adjuster 41, the laser head 42 and the focusing lens 43. In FIG. The position adjuster 41 is preferably automatically driven by a stepping motor in accordance with the PLC signal, and may be manually driven as the case may be.

The metal scrap passing through the analysis unit 40 is loaded in a separate container in the sorting unit 50 for each homogeneous component according to the analysis result. Fig. 9 shows an embodiment of a tubular metal scrap container 51. Fig. The tubular metal scrap is vertically lowered through the rear driving roller 23 shown in Figs. 4 and 8, wherein a guide rail (not shown) for guiding the tubular metal scrap container 51 of Fig. 9 The plurality of tubular metal scrap containers (51) are arranged to cross each other at right angles to the direction of transport of the metal scraps. In FIG. 9, a plurality of tubular metal scrap containers 51 are shown to be movable by a ball screw method with a speed reducer attached thereto. However, there is no particular limitation on a driving method for moving the plurality of tubular metal scrap containers 51.

The flat metal scrap containers 52 and 53 are also moved in the same manner as the plurality of the tubular metal scrap containers 51 and are moved so that the metal scrap can be loaded on the containers determined by the components. At this time, a movement control command of the metal scrap containers 51, 52, and 53 is transmitted from a control unit (not shown).

The control unit (not shown) includes a PLC program for controlling the classifying unit 50, an HMI program, and a program for linking the classifying unit 50 and the analyzing unit 40, which is a known technique, A detailed description will be omitted here.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

10: input section 20: transfer section
21: Conveyor 21a: Horizontal zone
21b: inclined section T: penetration area
22: front end drive roller 23: rear end drive roller
30: pressing portion 31: contact member
32: elevating mechanism 33: hinge shaft
40: Analysis section 41: Position controller
42: laser head 50:
51: tubular metal scrap container 52: flat metal scrap container
53: Flat metal scrap container

Claims (7)

A metal scrap charging unit;
A transferring part for transferring the metal scrap introduced by the metal scrap charging part along the transferring line, the transferring part having a through area for laser irradiation;
A laser analyzer for analyzing the components of the sample using the emitted plasma as an excitation source, the laser analyzer comprising: a laser head disposed at a lower portion of the transfer section for irradiating the metal scrap with a laser through the penetration area;
A pressing part provided on the conveying part so as to oppose the laser head to guide the metal scrap which is horizontally conveyed in the conveying direction;
A classifying portion for classifying the metal scraps conveyed along the conveying line;
And a control unit for controlling the sorting unit to sort the metal scrap according to a component of the metal scrap detected by the analyzing unit. The method according to claim 1,
Wherein the conveying section includes a horizontal section in which the flat metal scrap is seated and an inclined section in which the tubular metal scrap is seated. 3. The method of claim 2,
In the transverse section of the transfer section, the horizontal section is arranged at both ends, the inclined section is arranged between the horizontal sections,
The inclined zone consists of two inclined plates which converge from the inner end of the horizontal zone to the lower center,
Wherein the penetration area is a distance between two swash plates at a lower center. The method of claim 3,
And the width of the penetration area is smaller than the cross-sectional diameter of the tubular metal scrap. The method according to claim 1,
Characterized in that the contact member which is in contact with the metal scrap in the pressing portion is a plate spring or a rotating roller, 6. The method of claim 5,
Wherein the pressing portion further includes a lifting mechanism for adjusting a height of the contact member so as to correspond to a height corresponding to a shape of the metal scrap. The method according to claim 6,
Wherein the contact member and the lifting mechanism are coupled by a hinge shaft.

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