JPH11147076A - Apparatus for selective recovery of metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select/recover valued non-ferrous metals by material surely by a method in which the weight of metal and non-metal crushed pieces is measured, the variation of inductance by the pieces is measured, the materials of the pieces are discriminated according to the results of measurement, and the pieces are recovered by material by a recovery means. SOLUTION: Crushed pieces 2 are charged into a hopper 400 and supplied one by one to a transportation apparatus 1 through vibration feeders 401, 402. The transportation apparatus is equipped with an inductance detecting coil 9 and a photo-sensor 18, and the variation of inductance is detected by the coil 9 on the basis of the detection signal of the sensor 18 when the pieces 2 passed. The weight of the pieces 2 is measured while the pieces 2 are sliding on the guide surface 31 of a weight detector 4 through an impact relaxation guide 403. While the pieces 2 is passing through a guide 508, materials are discriminated from the ratio between the variation of inductance and the weight by an operation/control apparatus 21, and the pieces 2 are recovered by material by a recovery apparatus 501 according to the result of discrimination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal sorting and collecting apparatus for detecting a change in inductance and a weight of a crushed piece from a crushed piece of waste containing metal, and identifying and collecting the metal material based on the detected values. .

[0002]

2. Description of the Related Art Conventionally, the process of sorting and recovering relatively expensive valuable non-magnetic metals such as iron, copper, aluminum, and stainless steel other than iron from waste mixed with metals and non-metals such as plastics is quite old. Especially, wastes having a small shape and a relatively uniform size are sorted and collected relatively efficiently by a conventional sorting and collecting apparatus. In a conventional general sorting and collecting apparatus, a magnetic sorter is used for iron, and a rotating drum type eddy current sorter is used for copper and aluminum. In addition, a wind separator, a vibratory separator, and a specific gravity separator using a liquid (heavy liquid) having a relatively large specific gravity are also generally used.

[0003] In addition, crushed pieces having a relatively large shape are often manually selected (hereinafter, referred to as “hand-selected”). For example, as in a metal waste crushing treatment facility described in JP-A-57-81878, iron is removed by a magnetic separator, nonmetals are removed by a wind separator, and then nonmagnetic metals are mainly sorted. There is a conventional technique of performing manual sorting (using only a rotary type wind sorter for small articles).

[0004]

With respect to the non-magnetic metal from which iron has been removed, it is possible to collectively sort copper and aluminum by, for example, the above-mentioned eddy current sorter, but copper and aluminum are separated. With difficulty. Further, the above-mentioned wind sorter or vibratory sorter has a good separation efficiency due to a difference in specific gravity for relatively small and uniform granular crushed pieces having a size of 10 mm or less, but has a large size of about 10 to 200 mm. Sorting of crushed pieces is difficult due to the shape.

[0005] Further, in the selection using a heavy liquid composed of a liquid in which iron fine powder is colloidally diffused in water, for example, if a heavy liquid having a specific gravity of 3 is used, aluminum floats and copper sinks. Sortable. However, this method can take a large amount of processing, but on the other hand, the apparatus is large-scale and expensive. In addition, since heavy liquid is used, water treatment equipment is required and the equipment becomes large, and it is also necessary to control the specific gravity of heavy liquid,
Workers for maintenance are indispensable. Furthermore, the sorting performance is reduced for cans and pipe-shaped fragments. Therefore, it is desired to perform maintenance-free sorting and collection without using a liquid.

In the prior art described in Japanese Patent Application Laid-open No. 57-81878, one aim is to sort and collect relatively large pieces of crushed pieces. In a poor environment such as noise, dirt, and danger, or to engage in long-time simple work. Also, from the viewpoint of waste disposal, it is natural that the cost of disposal should be reduced to a level that is profitable. This makes it difficult to reduce costs. For this reason, it is desired that sorting and collection can be automatically performed without manual operation.

Here, considering the sorting method, first, waste industrial products are crushed by a crusher, and crushed pieces having various particle sizes from fine crushed pieces having a particle size of 1 mm or less to large crushed pieces are mixed. Therefore, in the sorting of fine particles having a particle size of 1 mm or less, the particle size is relatively uniform, so that it can be sorted out by wind separation or the like. This means that the crushing energy is large and inefficient.

Accordingly, an object of the present invention is to recover valuable non-magnetic metals such as copper, aluminum, and stainless steel from relatively large crushed pieces by material, and to separate non-metals such as plastic and rubber separately from the non-magnetic metal. An object of the present invention is to provide a sorting and collecting device capable of collecting and a waste disposal system having such a metal sorting device. Further, for the metal sorting apparatus, the recovery purity and the throughput are important factors in the sorting performance, and it is necessary to increase the sorting speed as much as possible to increase the throughput.

Therefore, when the sorting speed is increased, the crushed pieces discharged from the discharge side of the transfer device of the inductance measuring section fly in a parabolic shape, so that the impact mitigation guide must be extended to the drop position or dropped at a distance. It had to be installed in a location. Further, in this case, the crushed pieces may rebound on the impact relaxation guide and give a large impact even on the weight measurement guide ahead. In addition, non-metals such as plastic and rubber have a large friction with the guide surface, so that the sliding speed on the weight measurement guide is reduced, which hinders the increase in speed.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal sorting and recovery apparatus for identifying and recovering the material of crushed pieces containing metal, wherein the weight of these metal and non-metal crushed pieces is measured at high speed. Measuring means, and said inductance measuring means for measuring the amount of inductance change due to the crushed pieces similarly at high speed, identifying the material of the crushed pieces using these weight and inductance change amount, based on the identification result, the material This is achieved by providing a separate collecting means for collecting the crushed pieces.

Here, since the detection of the inductance is detected while the crushed pieces pass through the coil provided on the transfer device, it is possible to increase the transfer speed of the transfer device under detectable conditions. is there. However, in order to accurately and quickly measure the weight of the crushed pieces conveyed by the weight measuring means, it is necessary that the crushed pieces slide on the guide of the weight measuring means at high speed without impact.

When the conveying device is conveyed with the conveying surface at the outlet side of the conveying device horizontal, the crushed pieces are discharged horizontally from the outlet portion of the conveying device, and as the conveying speed increases, the horizontal distance until reaching the inclined guide surface of the weight measuring means is increased. And the size of the device increases.

Therefore, in order to make the weight measuring device as compact as possible, it is necessary to provide a guide for relaxing the impact before the weight measuring guide and to tilt it. Furthermore,
It is necessary to set the height of the entrance of the guide of the weight measuring means to be lower than the height of the exit of the guide for reducing the impact. In addition, crushed pieces sent out at high speed from the transport device,
Immediately sliding on the guide for reducing the impact to convey is achieved by inclining the conveying surface on the exit side of the conveying device. Further, it is necessary to set the height on the entrance side of the guide for reducing the impact lower than the height on the exit side of the inclined conveying surface of the conveying device.

Further, in order to convey non-metal having high friction with a guide surface such as plastic or rubber by sliding at a high speed without decelerating on a guide for relaxing an impact or on a guide of a weight measuring means, It is necessary to provide a crushed piece feed mechanism by a pneumatic pressure or a rotating brush on the guide for reducing the impact or on the guide of the weight measuring section.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a metal sorting and collecting apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram showing a metal sorting and collecting apparatus for detecting a change in inductance and a weight of a crushed piece and identifying a material according to the present embodiment. In FIG. 1, a crushed piece 2 containing metal having a particle size of 10 mm or more, which has been crushed by a crusher (not shown) and further removed by a sieve (not shown) and has a particle size of 10 mm or less, is first supplied to a hopper 400 of a supply unit. To the vibrating feeder 401 from the lower part of the hopper, and is dispersed by the vibrating feeder 401 in a planar manner.
02 and are arranged in a line at a distance one by one.
Sent to Here, the supply amount of the crushed pieces from the vibrating feeder 401 per unit time is controlled so that the interval between the crushed pieces can be secured to the minimum so that one piece at a time sequentially passes through each sensor unit.

The transport device 1 is driven by a transport device motor 11. In addition, the conveyance device 1 is provided with a coil 9 for detecting inductance and a photosensor 18 in front of the coil 9 for detecting the detection signal of the photosensor 18 when the crushed pieces 2 pass through the photosensor 18. A change in inductance is detected based on the detection coil 9 based on that. That is, a voltage having a frequency f is applied to the detection coil 9 in advance, and an AC magnetic field is formed on the belt surface of the transport device 1. Therefore, the inductance when the crushed pieces 2 are not present in the detecting portion of the coil is detected as an initial inductance, and then the supplied crushed pieces 2 are transported by the transport device 1 and reach the detecting portion of the detecting coil 9. On the other hand, an eddy current is generated in the fragment (conductive material) passing through the alternating magnetic field, and a back electromotive force is generated. As a result, the inductance of the coil changes (decreases). The amount of change in the inductance indicates the difference between the initial value of the inductance and the inductance when the crushed pieces pass through the detection unit. The photo sensor 1
The detection signal of the passage of the fragment 2 by the
Is taken into the arithmetic and control unit 21 connected via the.

Next, on the discharge side 603 of the conveying device 1, the conveying surface of the belt is inclined, and the inclination angle is determined by the inclination angle of the impact relaxation guide 403 provided ahead and the guide of the weight detection device 4 ahead. The angle is approximately equal to the inclination angle of 31. Therefore, the crushed pieces 2 discharged by the transport device 1 immediately pass through the impact relaxation guide 403 with a small impact, slide on the guide surface 31 of the weight detection device 4 with a further small impact, and measure the weight during that time. . On the discharge side 603 of the transport device 1, the transport belt surface is inclined in the direction along the inclined surface of the inclined guide, and the impact due to the step is reduced as much as possible to reduce the impact of the impact reducing guide 40.
The crushed pieces 2 can be supplied to the guide surface 3. Also,
Since most of the crushed pieces are transported along the transport surface,
The impact mitigation guide 403 and the weight measuring device 4 can be installed at a minimum distance.

Here, the behavior of the crushed pieces when the discharge side transfer surface of the transfer device 1 is not inclined will be described with reference to FIG. The crushed pieces 2 are transported horizontally by the transport device 1. Also on the exit side 603, the crushed pieces 2 are discharged horizontally as it is by inertia, fall in a parabolic shape, and come into contact with the impact relaxation guide 403. Therefore, in this case, it is necessary to increase the distance between the transport device 1 and the impact mitigation guide 403, and the impact on the impact mitigation guide 403 is large. Can occur.

Next, the weight detecting device 4 will be described with reference to FIG. The weight detecting device 4 guides the crushed pieces 2 with a guide 31 and supports the weight. The weight of the fragment 2 applied to the guide 31 is transmitted to the load cell 33 via the support member 32. The guide 31 is inclined and connected to the support member 32 so that the crushed pieces 2 can slide without deceleration. The support member 32 is supported by a bearing 34 so as to be slidable only in the axial direction, so that frictional resistance is reduced.
The lead wire 5 of the load cell 33 is drawn out of a hole provided in the wall surface of the weight detector 4 and connected to the strain amplifier 6 in FIG. 1. The output signal of the strain amplifier 6 is supplied to the A / D converter 7. The weight is detected by the calculation / control device 21 via the interface 8. Next, in FIG.
Passes through the guide 508 while the arithmetic and control unit 21
Then, the material is identified from the ratio between the change in inductance and the weight, and collected by the collection device 501. In the collecting device 501, a collecting container is provided for each material. For example, aluminum is collected in 509 and copper is collected in 550. The stainless steel is collected in 512, and the other (non-metal, etc.) is collected in 513.
Separators 502d to 502f serving also as guides for crushed pieces are provided at the upper part of the recovery container for each material, and the operation of the actuator 16 connected to each of the separators 502d to 502f causes a vertical movement as indicated by an arrow 504. Open and close.

FIG. 6 shows details of the separator. For example, one end in the transport direction of the separator 502d of the aluminum collection container 509 has a bearing 506 on both sides thereof.
, And one shaft 505 is connected to the actuator 16. These actuators 16 are operated and calculated via the interface 8 shown in FIG.
It is connected to the control device 21 and, in accordance with the result of identifying the material of the crushed pieces, the corresponding collection container 509, collection container 55
0, Separator 502d-50 at the upper part of the collection container 512
Open 2f upward. The separators 502d to 502f are usually closed on stoppers 507 of the respective collection containers, and the crushed pieces 2 slide and guide on the stoppers 507.

If the crushed pieces are identified as aluminum, the actuator 16 connected to the axis of the separator 502d on the upper part of the aluminum recovery container 509 is operated to open the separator 502d upward. Then, the crushed pieces that have slid there are stored in an aluminum recovery container 509. Next, when it is identified as another material, the aluminum separator 502d is closed, and the separator of the corresponding collection container is similarly opened. In addition, non-metals such as plastic and rubber are mainly collected in the other collection container 513, but may be other non-magnetic metals.

Here, aluminum, copper, stainless steel,
Other materials can be identified from the change in inductance and the ratio of crushed pieces, and each collection container (509, 5)
50, 512).

Next, the inductance measuring device 20 will be described with reference to FIG. In the embodiment shown in FIG. 4, the detection coil 9 is arranged near the transport belt 406 of the transport device 1, and the inductance is measured when the crushed pieces 2 are transported by the transport belt 406 of the transport device 1. . This is called a self-inductance type (external detection type). The inductance measuring device 20 applies an AC voltage having a set frequency to the detection coil 9, and an AC magnetic field is formed on a surface of the conveyor belt 406 below the detection coil 9. When the crushed pieces 2 (a non-magnetic metal that is a conductive material) pass through the AC magnetic field, an eddy current is generated in the crushed pieces,
Back electromotive force is generated. As a result, the inductance of the detection coil 9 changes (decreases). Note that the inductance measuring device 20 includes an inductance detecting circuit 23 of the detecting coil 9. Although not shown, the inductance measuring device 20 also has an output port for sending measured inductance data to the arithmetic and control device 21.

Next, another embodiment of the method of measuring the inductance of the detecting coil is shown in FIG. FIG. 5 shows that an exciting coil 9a having a frequency oscillation amplifier circuit 22a is provided so as to face the detecting coil 9, and the exciting coil 9a and the exciting coil 9a are conveyed when the crushed pieces 2 are conveyed by the conveying belt 406 of the conveying device 1. Mutual inductance is measured by utilizing a mutual induction effect generated between the detection coils 9. This is called a mutual inductance type. That is, an AC magnetic field is generated between the excitation coil 9a and the detection coil 9 by applying an AC voltage having a set frequency to the excitation coil 9a. As a result, a voltage is induced in the detection coil 9 by an electromagnetic induction phenomenon. Similarly, when the crushed pieces (conductive material) 2 pass there, an eddy current is generated in the crushed pieces 2 and a back electromotive force is generated. As a result, the detection voltage of the detection coil 9 changes, and the inductance also changes. Therefore, the inductance of the detection coil can be detected by the inductance detection device 20.

Alternatively, a change in the detection voltage of the detection coil 9 and a phase difference between the phase of the voltage applied to the excitation coil 9a and the detection voltage of the detection coil are equivalent to a change in inductance. However, in FIGS. 4 and 5, FIG.
The same reference numerals are given to members equivalent to.

The effect of identifying the same material as that of the self-inductance type according to the embodiment of FIG. 1 can also be obtained by the measurement using the mutual inductance type shown in FIG. 5 as described above.

Next, the electrical connection of the components of the metal sorting and collecting apparatus according to this embodiment will be described with reference to the block diagram of FIG. As shown in FIG. 7, the arithmetic and control unit 21 includes an arithmetic circuit (CPU) 24, a storage circuit (RAM) 25, and a storage circuit (ROM) 26. And input / output of data. That is, the selection actuator 16 is driven via the driver (2) 17. Further, the inductance of the detection coil 9 is detected by the inductance measuring device 20. Further, the signal from the photo sensor 18 is taken in via the amplifier (2) 19, and the weight of the crushed pieces 2 detected by the load cell 33 is taken in via the amplifier 6 and the A / D converter 7.

Next, FIG. 8 shows the value obtained by dividing the change in inductance of the detection coil 9 depending on the presence or absence of the crushed pieces 2 by the weight of the crushed pieces with respect to the applied frequency. 8, the horizontal axis represents the frequency of the applied voltage (applied frequency) f, and the vertical axis represents the fragment 2
Is a value obtained by dividing the inductance change amount ΔL due to the difference between the presence and absence of the weight by the weight W, that is, the inductance change amount per unit weight, and this value is represented as a discrimination value α. In addition, A1 in the figure
A3 indicates a threshold for discriminating each material at the applied frequency f2, A1 indicates a threshold for aluminum at the applied frequency f2, A2 indicates a threshold for copper and brass similarly, and A3 indicates a stainless steel. Indicates the threshold value. A1 'to A3' indicate thresholds for determining each material at the applied frequency f1. It should be noted that the amount of change in inductance per unit weight (determination value) in this figure is an absolute value.

To summarize the above, in FIG. 8, predetermined set values A (for example, A1 to A3, A1 'to A3') are determined in advance, and the applied frequency f
The amount of change in inductance per unit weight at 1 and f2 (discrimination value) is obtained, and compared with the set values A1 to A3 or A1 'to A3', the material of the crushed piece 2 is aluminum, copper, brass, It becomes possible to distinguish between stainless steel and other (non-metal). That is, if the discrimination value at the applied frequency f2 is (ΔL / W)> A1, aluminum; if A1 ≧ (ΔL / W)> A2, copper or brass; if A2 ≧ (ΔL / W)> A3, stainless steel; If ≧ (ΔL / W), it is identified as other.

However, as is apparent from FIG. 8, the discrimination value (Δ
Looking at the frequency characteristics of (L / W), the threshold values for the individual materials are close to each other at high frequencies and some are far from each other at low frequencies. In consideration of the above, if the identification is performed at an optimum frequency having a threshold value apart from each material, the identification accuracy is improved.

Next, referring to FIG. 3, the behavior of the crushed pieces 2 and the measurement accuracy of the weight measuring device 4 when the carrying surface of the carrying device is horizontal will be described. 3, the crushed pieces 2 are conveyed by the conveyance device 1 and measured for inductance change by the coil 9, then discharged horizontally from the outlet side 603, fall in a parabolic shape due to inertia, and come into contact with the impact relaxation guide 403. At that time, as the transport speed increases, the horizontal distance increases, and it is necessary to increase the distance between the transport device and the impact mitigation guide 403.

Also, depending on the manner of contact with the impact mitigation guide 403, there is a possibility that an impact will be given to the guide of the weight measuring device 4 by reaction. Therefore, as shown in FIG. 1, by tilting the outlet side transfer surface 603 of the transfer device 1, the crushed pieces 2 are transferred while sliding on the guide without splashing.

Next, when the crushed pieces are made of a nonmetal such as plastic or rubber, a feed mechanism provided to prevent the sliding speed from being reduced due to friction on the guide of the shock absorbing guide or the weight measuring device is shown in FIG. This will be described with reference to FIG. First, FIG. 9 shows a mechanism for transporting the crushed pieces 2 using air pressure. Air blowing holes 60 are provided on the shock mitigation guide 403.
An air nozzle 604 in which 6 are arranged is provided to inject air when passing through the crushed pieces 2 and has an effect of preventing a reduction in speed due to friction when passing over the impact mitigation guide 403 and the guide of the weighing device. .

As shown in FIG. 1, the timing of injecting air is detected by detecting the passage of the crushed pieces 2 by the photo sensor 18 provided in front of the air nozzle 604, and
The opening and closing of the electromagnetic valve 602 in the pipe from the air source 601 is controlled so that air is injected at the timing when the air passes over the upper part and the guide 31 of the weight measuring device.

FIG. 10 shows another example of a device for transporting crushed pieces 2. An annular member 609 is provided on the rotating shaft 608, a plurality of elastic members 610 are provided on the outer periphery thereof, and one end of the shaft is connected to a motor 612 via a coupling 611, and the elastic member 610 is rotated by rotation of the motor. . The crushed piece 2 that this elastic member passes while sliding on the impact relaxation guide 403
Pressing has the effect of preventing a decrease in speed. The rotating shaft 608 is supported by bearings (not shown) having both ends fixed to a side plate or the like.

Further, the crushed piece feed mechanism always rotates during the operation of the apparatus, so that there is no problem.

Next, the electrical connection of the air nozzle type mechanism will be described with reference to the block diagram of FIG.
An electromagnetic valve 602 is provided in the air pipe between the air source 601 and the air nozzle 604 shown in FIG.
2 is opened and closed by a driver (3) 605. That is, as shown in FIG. 7, the driver 605 is connected to the interface 8, and drives the driver (3) 605 with the support from the arithmetic and control unit 21 to open and close the electromagnetic valve 602.

Next, the sectional shapes of the shock relaxation guide 403 and the guide 31 of the weight measuring device 4 will be described with reference to FIGS. FIG. 11 shows that the guide has a flat cross-sectional shape, and the resistance when sliding is small. FIG. 12 shows a V-shaped cross section of the guide, and the crushed pieces slide toward the center. FIG. 13 shows a U-shaped cross section of the guide, which has a small sliding resistance and
Fragments slide along the center.

From the above results, since this system is a dry system that does not use water or the like, the apparatus can be simplified and compact, and the sorting and collection can be performed at low cost and maintenance-free without manual operation.

According to the system of the present embodiment, valuable non-magnetic metals such as copper, aluminum and stainless steel are sorted and recovered at high speed from waste industrial products in which non-metals such as metals and plastics are mixed. It can be used effectively for recycling.

The waste treatment system of the present invention is applicable to all waste industrial products.

[0042]

According to the apparatus and method for sorting and recovering metals of the present invention, the amount of change in inductance due to the crushed pieces of the detection coil and the weight of the crushed pieces are measured at high speed and with high accuracy to identify the material of the crushed pieces. And, since crushed pieces are collected for each material based on the identification result, valuable non-ferrous metals such as copper and aluminum are sorted and collected at a high speed and reliably by material from relatively large crushed pieces and included in the crushed pieces. Non-metals can be separated and recovered.

Further, according to the waste treatment system of the present invention, iron, copper, brass, aluminum and the like can be produced from industrial products such as waste home appliances and waste vehicles in which nonmetals such as metals and plastics of various shapes are mixed. It is possible to efficiently sort and collect valuable non-magnetic metals with high purity and the like, and to perform sorting and collection at a maintenance-free and low cost without manual labor.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a metal sorting and collecting apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing details of the structure of the weight detection device of FIG. 1;

FIG. 3 is a diagram showing the conventional transport device of FIG. 1;

FIG. 4 is a diagram illustrating the inductance measuring device of FIG. 1;

FIG. 5 is a diagram illustrating a method of measuring inductance according to another embodiment of the present invention.

FIG. 6 is a plan view of the crushed piece recovery device of FIG. 1;

FIG. 7 is a block diagram showing an electrical connection relationship of each device of the metal sorting and collecting apparatus of FIG. 1;

FIG. 8 is a diagram showing a change in inductance per unit weight of a detection coil depending on the presence or absence of crushed pieces with respect to an applied frequency.

FIG. 9 is a diagram showing details of a crushed piece conveying device using an air nozzle.

FIG. 10 is a diagram showing details of a crushed piece conveying device that sends crushed pieces by rotation of an elastic member.

FIG. 11 is a diagram showing a cross-sectional shape of a guide.

FIG. 12 is a diagram showing a cross-sectional shape of a guide according to another embodiment.

FIG. 13 is a view showing a cross-sectional shape of a guide according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Conveying device, 2 ... Fragment, 4 ... Weight detector, 6 ... Strain amplifier, 7 ... A / D converter, 8 ... Interface, 9 ... Detection coil, 9a ... Exciting coil, 11 ...
Motor for transfer device, 16 ... Actuator for sorting, 17
... Driver, 18 ... Photo sensor, 19 ... Amplifier, 20
... Inductance measurement device, 21 ... Calculation / control device, 2
4 arithmetic circuit (CPU) 25 memory circuit (RAM)
26: memory circuit (ROM), 31: guide, 32: support member, 33: load cell, 34: bearing, 400: hopper, 401: vibration feeder (1), 402: vibration feeder (2), 406: transport belt, 502d: aluminum recovery separator, 502e: copper recovery separator, 502
f: stainless steel recovery separator, 505: shaft, 506: bearing, 507: stopper, 508: guide, 509: recovery container, 512: stainless steel recovery container, 513: other recovery container, 550: copper recovery container, 601: air source, 602
... solenoid valve, 603 ... discharge part, 604 ... air nozzle, 60
5: Driver (3), 606: nozzle hole, 607: air flow, 608: rotary shaft, 609: annular member, 610: elastic member, 611: coupling, 612: motor.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuhisa Takemoto 603, Kandachicho, Tsuchiura-shi, Ibaraki Prefecture Within Hitachi Tsuchiura Engineering Co., Ltd.

Claims (1)

[Claims] 1. A weight measuring means for measuring the weight of a crushed piece containing a metal, and an inductance measuring means for measuring an amount of inductance change due to the crushed piece, and a material of the crushed piece is determined by using the weight and the amount of change in inductance. Discriminating and collecting means for collecting the crushed pieces by material based on the identification result, wherein the crushed pieces are guided by an inclined guide member and the weight is measured before the weight measuring means. A crushed piece transfer device provided with an inclined guide member and further provided with an inductance measuring means having a sloping transfer surface in front thereof.