JPH0731899A - Device for magnetic sorting and method therefor - Google Patents

Abstract

PURPOSE:To provide a magnetic sorting machine, by which both efficiency enhancement of sorting work and improvement of general-purpose properties are realized. CONSTITUTION:When a mixture is moved on a feeder 6 and moved to the lower part of the sorting drum 15 of a magnetic sorting device 12, magnetic metallic parts in the mixture are attracted to the sorting drum 15. In the case, the rotating speed of the sorting drum 15 (216mmphi) is set at the large value of e.g. about 120rpm. Then centrifugal force in the external circumference of the sorting drum 15 is increased to about 0.88G. The magnetic metallic parts are erected in the nearly radial direction of the sorting drum 15 by the large centrifugal force. Therefor the intertwined magnetic metallic parts are decreased and the amount of nonmagnetic material (e.g. honing stone) carried out to a belt 17 side is decreased to 0-1 grain.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sorting apparatus capable of efficiently and reliably sorting magnetic metal parts and non-magnetic materials.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Laid-Open Patent Publication No. 62-23458 has been proposed as a technique of this kind. That is, a feeder having a vibrating device is horizontally oscillatably installed, a sorting drum with a built-in magnet is horizontally installed so as to face the feeder, and a sieve is installed between the sorting drum and the feeder. This is a technique in which a non-magnetic material that is entangled due to the entanglement between metal parts is separated by a sieve and only magnetic metal parts are adsorbed to a selection drum.

[0003]

However, in the above-mentioned prior art, if the distance between the screens installed between the selection drum and the feeder is large, the screening function of the screens is deteriorated and there is a possibility that non-magnetic substances may be caught. Occurs. On the other hand, if the distance between the screens is small, the mixture of the non-magnetic material and the magnetic material becomes lumps and cannot pass through the screen. Therefore, in order to efficiently select the magnetic substance and the non-magnetic substance, the distance between the sieves and the magnetic substance must be carefully determined. For this reason, when the size of the magnetic material is changed, a complicated work of replacing the magnetic material with a sieve having a different interval is required each time, which causes a reduction in the workability and the versatility of the apparatus is not yet sufficient. There was a problem.

The present invention has been made in view of these circumstances, and an object of the present invention is to provide a magnetic sorter capable of suitably improving the work efficiency of sorting work and improving versatility.

[0005]

The invention according to claim 1 made in order to solve the above-mentioned problems, a selection drum having a built-in magnet built on a machine body, the selection drum, and the machine body. A belt mounted between the guide roll and a magnetic roll, the magnetic sorting apparatus for bringing a mixture of a magnetic substance and a non-magnetic substance close to a sorting drum and adsorbing the magnetic substance to the sorting drum for sorting. It is characterized by further comprising speed adjusting means for adjusting the rotation speed of the sorting drum so that the magnetic substance adsorbed to the sorting drum stands up in the radial direction of the sorting drum. Further, the invention according to claim 2 is provided with a selection drum with a built-in magnet installed on the machine body, a belt mounted between the selection drum and a guide roll installed on the machine body, In a magnetic sorting apparatus for bringing a mixture of a magnetic substance and a non-magnetic substance close to a sorting drum and adsorbing a magnetic substance to the sorting drum for sorting, the magnetic sorting device is installed horizontally on the machine body so as to face the sorting drum, and the sorting is performed. It is characterized in that it is provided with an auxiliary drum with a built-in magnet for standing up the magnetic substance adsorbed on the drum in the radial direction of the selection drum. Note that, for example, the auxiliary drum may be rotatably installed with a magnet embedded in a part of the circumferential direction thereof. Further, for example, the auxiliary drum may be rotatably installed with a plurality of magnets embedded in the circumferential direction at predetermined intervals. Further, the invention according to claim 5 is a magnetic sorting method in which a mixture of a magnetic substance and a non-magnetic substance is brought close to a rotating sorting drum having a built-in magnet to adsorb the magnetic substance to the sorting drum for sorting. After the substance is adsorbed to the sorting drum, the magnetic substance is erected in the radial direction of the sorting drum by an external force acting in the radial direction of the sorting drum.

[0006]

According to the first aspect of the present invention, the rotating speed of the sorting drum is adjusted according to the size of the magnetic substance, and the centrifugal force generated causes the magnetic substance to stand in the radial direction of the sorting drum. The entanglement between the and non-magnetic material is eliminated. According to the second aspect of the invention, the magnetic substances adsorbed to the selection drum due to the influence of the magnetic force lines generated between the selection drum and the auxiliary drum with a built-in magnet that is installed so as to face the selection drum are It stands up in the radial direction on the circumference and prevents the non-magnetic material from being caught in the magnetic material. When a magnet is embedded in a part of the circumferential direction of the auxiliary drum so as to be rotatably installed, or when a plurality of magnets are embedded in the circumferential direction of the auxiliary drum at predetermined intervals so as to be rotatably installed. , The magnetic substance adsorbed to the sorting drum due to the effect of the magnetic field lines that periodically occur and disappear between the sorting drum and the auxiliary drum repeatedly stands up in the radial direction and reclines in the tangential direction on its circumference, and becomes magnetic. It works to prevent the inclusion of non-magnetic materials in objects. Also,
According to the invention of claim 5, the magnetic substance adsorbed on the selection drum is radiused on the circumference of the selection drum by the external force acting after the magnetic substance is adsorbed on the selection drum in the radial direction of the selection drum. Standing up in the direction, the entanglement and entanglement of magnetic and non-magnetic materials is eliminated.

[0007]

As described above, according to the first aspect of the present invention, when the size of the magnetic material is changed, it is possible to adjust the rotation speed of the selection drum to various sizes. It has an excellent effect that it can immediately deal with a magnetic substance, improve its workability, and improve the versatility of the device. Further, according to the invention described in claim 2, by the function of the auxiliary drum arranged to face the sorting drum,
It is possible to prevent the non-magnetic material from being caught in the magnetic material adsorbed on the sorting drum, and to improve the reliability of the work. According to the third or fourth aspect of the invention, the lines of magnetic force acting between the auxiliary drum facing the selection drum are periodically generated and disappeared by the rotation of the auxiliary drum, so that the magnetic force attracted to the selection drum is increased. It is possible to more reliably prevent the non-magnetic substance from being caught in the substance. further,
According to the invention described in claim 5, the work efficiency and reliability of the sorting work can be improved.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. <First Embodiment> FIGS. 1 to 4 show a first embodiment of the present invention. This magnetic sorting step is set as a step subsequent to the barrel polishing step. In this device, a vibration transfer device 3 is horizontally suspended by a spring 4 on a machine body 1 having wheels 2 at the bottom. The vibrating and conveying device 3 is composed of a pair of vibrating devices 5 attached to the bottom, a feeder 6, a hopper 7, a side plate 8, a discharge port 9 and the like. The vibrating device 5 uses a known Eurus motor (manufactured by Yasukawa Electric Co., Ltd.) or the like. As shown in FIG. 1, a pair of guides 10 are installed in the feeder 6 at intervals larger than the width of the opening of the hopper 7. A flow adjusting plate 11 that adjusts the gap between the openings is attached to the hopper 7. As shown in FIG. 3, a magnetic sorting device 12 is suspended above the feeder 6 from the machine body 1 by bolts 13 and nuts 14 so that the height thereof can be adjusted.

As shown in FIG. 2, the magnetic sorting device 12 has a sorting drum 15 installed above the feeder 6 along the width direction thereof. A plurality of permanent magnets are arranged on the inner peripheral surface of the sorting drum 15 along the circumferential direction with a slight gap. A belt 17 made of rubber is installed between the selection drum 15 and a guide roll 16 and is driven by a motor 21 whose speed is adjustable via a pulley 18, a transmission belt 19 and a pulley 20 as shown in FIG. To be done. The motor 21 rotates at a rotation speed instructed by an adjusting device (inverter or the like) (not shown).

Next, the operation of the first embodiment will be described. A mixture (mass) of a work (magnetic metal part) to be polished after the barrel polishing process and a non-magnetic polishing stone or the like is put into the hopper 7 to drive the vibrating device 5 of the vibration transfer device 3. To do. The amount of the mixture discharged from the hopper 7 is adjusted by the flow rate adjusting plate 11. In addition, the speed at which the mixture is conveyed depends on the vibration device 5
It can be adjusted by the adjusting mechanism built into the. The mixture passing through the opening of the hopper 7 is fed by the feeder 6
When the upper part is guided to the guide 10 and moved to the lower part of the sorting drum 15 of the magnetic sorting device 12, the magnetic metal components in the mixture are adsorbed on the peripheral surface of each of the permanent magnets of the sorting drum 15. At this time, the rotation speed of the inverter motor 21 is adjusted to set the rotation speed of the selection drum 15 (216 mmφ) to a high value of about 120 rpm, for example. Then, the centrifugal force on the outer periphery of the sorting drum 15 becomes as large as about 0.88 G, and as shown in FIG. 4 (A), the large centrifugal force causes the magnetic metal parts to stand up in a substantially radial direction of the sorting drum 15. . As a result, the number of magnetic metal parts that are entangled with each other is reduced, so that the belt 17 made of a non-magnetic material (for example, a polishing stone) is used.
The carry-out amount to the side is reduced to 0 to 1 grain. In this case, the volume mixing ratio of the magnetic metal parts and the non-magnetic material is 1: 9.
Is. By the way, in the prior art shown in FIG. 4 (B), the rotation speed of the sorting drum 15 is a low value of about 60 rpm, and the centrifugal force on the outer periphery of the sorting drum 15 is about 0.44 G, which is small. It does not stand in the radial direction of the sorting drum 15. For this reason, the amount of non-magnetic material (polishing stone) taken out to the belt 17 side was as large as 50 to 100 grains due to the entanglement of the magnetic metal parts.

The magnetic metal component thus attracted to the sorting drum 15 is carried to the guide roll 16 side by the belt 17 and is demagnetized by the demagnetizer 23. Then, the belt 17 falls into the magnetic material container (not shown) from the forward path. If the magnetic metal part comes into close contact with the belt 17 and is hard to drop, it can be easily dropped by spraying a shower. On the other hand, the non-magnetic material moves on the feeder 6 and the discharge port 9
Further, it falls into a non-magnetic material container (not shown), and the sorting operation is completed.

As described above, according to the first embodiment, when the size of the magnetic metal component is changed, the magnetic metal component is sorted to the extent that it is erected by the centrifugal force in the radial direction of the sorting drum 15. By simply adjusting the rotation speed of the drum 15, magnetic metal parts of various sizes can be dealt with immediately, and the workability thereof and the versatility of the apparatus can be improved. Further, since the entanglement between the magnetic metal parts is reduced, it is possible to reduce the carry-out amount of the non-magnetic material (grinding stone or the like) to the magnetic metal part collecting side, so that the sorting operation can be reliably performed.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, an auxiliary drum 31 having a strip-shaped permanent magnet 31a along the inner circumferential surface along the inner circumferential surface is provided in parallel with the sorting drum 15 so as to face the sorting drum 15 containing the permanent magnet. ing. The auxiliary drum 31 includes a motor 33 through a pulley (not shown), a power transmission belt 32 and a pulley (not shown).
Is driven more.

Next, the operation of the second embodiment will be described. The mixture is fed on the feeder 6 to the sorting drum 15 of the magnetic sorting device 12.
The magnetic metal parts in the mixture are adsorbed by the sorting drum 15 when they move to the lower part of the. At this time, the auxiliary drum 31 is rotated at several times to 10 times the rotation speed of the selection drum 15. Then, since the auxiliary drum 31 has the permanent magnets 31a built in over the circumferential half circumference, lines of magnetic force are periodically generated and disappeared between the selection drum 15 and the auxiliary drum 31. When this line of magnetic force is generated, the magnetic metal component stands up in a substantially radial direction of the sorting drum 15 (shown by a solid line in the figure). On the other hand, when the lines of magnetic force disappear, the magnetic metal parts lie sideways in the tangential direction of the sorting drum 15 (shown by broken lines in the figure). Then, the selected magnetic metal parts are carried to the guide roll 16 side by the belt 17, while the non-magnetic material moves on the feeder 6. In this way, magnetic metal parts and non-magnetic materials are selected.

As described above, in the second embodiment, the magnetic metal component repeats the standing up of the sorting drum 15 in the substantially radial direction (along the auxiliary drum) and the reclining in the tangential direction. For this reason, it is possible to prevent the non-magnetic material from being caught in the magnetic metal parts adsorbed to the selection drum 15, which further improves the work reliability and also the selection efficiency. A plurality of permanent magnets are arranged in the circumferential direction of the auxiliary drum 31 at predetermined angles (for example, every 30 degrees).
It can also be configured to be arranged at. When configured in this way, the period of generation and disappearance of magnetic field lines can be shortened,
The efficiency of sorting magnetic metal parts and non-magnetic materials can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic sorting device.

FIG. 2 is a side view of the magnetic sorting device.

FIG. 3 is a front view of a magnetic sorting device.

FIG. 4A is an explanatory view showing the operation of the magnetic sorting device,
(B) is an explanatory view showing a conventional technique

FIG. 5 is an explanatory view showing the operation of the magnetic sorting apparatus of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Machine body 3 ... Vibration transfer apparatus 5 ... Excitation apparatus 6 ... Feeder 15 ... Sorting drum 16 ... Guide roll 17 ... Belt 21 ... Motor 31 ... Auxiliary drum 31a ... Permanent magnet

Claims (5)

[Claims] 1. A magnetic material and a non-magnetic material, comprising: a selection drum with a built-in magnet installed on a machine body; and a belt mounted between the selection drum and a guide roll installed on the machine body. In a magnetic sorting apparatus for bringing a mixture of substances into a sorting drum to adsorb magnetic substances to the sorting drum for sorting, the sorting drum so that the magnetic substances adsorbed to the sorting drum stand in the radial direction of the sorting drum. A magnetic sorting device comprising speed adjusting means for adjusting the rotation speed of the magnetic separator. 2. A magnetic material comprising: a sorting drum with a built-in magnet, which is horizontally installed on the machine body; and a belt mounted between the selection drum and a guide roll installed on the machine body. In a magnetic sorting apparatus for bringing a mixture of non-magnetic material into a sorting drum and adsorbing a magnetic material to the sorting drum for sorting, the magnetic sorting apparatus is installed horizontally on the machine body so as to face the sorting drum and is attracted to the sorting drum. A magnetic sorting device comprising an auxiliary drum with a built-in magnet for standing up the magnetic material to be erected in the radial direction of the sorting drum. 3. A magnet is embedded in a part of the circumferential direction of the auxiliary drum, and the auxiliary drum is rotatably installed.
The magnetic sorting device described in. 4. The magnetic sorting device according to claim 2, wherein the auxiliary drum has a plurality of magnets embedded in a circumferential direction thereof at predetermined intervals and is rotatably installed. 5. A magnetic sorting method in which a mixture of a magnetic substance and a non-magnetic substance is brought close to a rotating sorting drum having a built-in magnet to adsorb the magnetic substance to the sorting drum for sorting, and the magnetic substance is loaded onto the sorting drum. After adsorbing, the magnetic substance is erected in the radial direction of the sorting drum by an external force acting in the radial direction of the sorting drum.