JPH0938524A - Wind electrostatic separator - Google Patents

Abstract

(57) [Abstract] [Problem] To improve the accuracy of sorting lightweight plastics and the like by using ionic wind generated by corona discharge. SOLUTION: An ion wind region W in which an ion wind EW is blown from an electrode unit 14 toward the conductive rotor 11 is provided in a sorting channel 13 which is sent obliquely downward along the tangential direction to the conductive rotor 11. The conductive dust collection tray 21 that guides the conductive dust Da that is formed and passes through the ion wind region W and discharged downward, and the conductive rotor that is blown up by the ion wind EW.
Semi-conductive waste collection duct 22 that sucks and separates semi-conductive waste Db having a weak adsorption force from crushed waste D that is adsorbed on 11, and conductive waste that discharges the insulating waste Dc that is adsorbed by the conductive rotor 11 and rotated. A sex waste collection tray 23 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushed dust in which an insulating material and a conductive material are mixed, and a to-be-sorted object having a rather large particle size, for example, a plastic or a combustible material for recycling from the crushed dust using ionic wind. The present invention relates to a wind-powered electrostatic sorting device for sorting.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a corona discharge type electrostatic sorting apparatus for sorting insulating particles and conductive particles has been rotated in a predetermined direction around a horizontal axis to, for example, a negative ground (earth). The mixed particles are cut out from the hopper 2 through the quantitative vibration feeder 3 on the upper surface of the electrically conductive rotor 1 which has been subjected to a corona discharge field E between the needle electrode 5 to which a high voltage is applied by the power source 4 and the rotor 1. Is formed. When the mixed particles enter the corona discharge field E, they receive an electric charge, and since the insulating particles have no charge replenishment from the ground electrode, the electric charge given by the electron emission exerts an attractive force on the rotor 1 and an attractive force of polarization. Is strongly adsorbed with. In addition, the conductive particles,
The electric charge received from the corona discharge field E is neutralized with the opposite electric charge from the rotor 1, and the electric charge is always applied from the rotor 1, so that the rotor 1 is repelled and separated.

In this way, the conductive particles are separated and dropped on the sorting tray 6A arranged on the upstream side of the rotor 1 in the rotation direction, and the semiconductive particles are dropped and separated on the intermediate sorting tray 6B. The scraper 7 separates the insulating particles scraped from the surface of the rotor 1 by the scraper 7 on the rearmost sorting tray 6C.

[0004]

However, when the above corona discharge type electrostatic sorting device is used for recovering plastic for recycling from crushed garbage, for example, wood or paper fibers are entangled with crushed plastic pieces. In many cases, this reduced the sorting accuracy and the purity of the sorted film.

The present invention solves the above problems and eliminates the entanglement between crushed dusts by using ionic wind to improve the sorting accuracy and improve the purity of crushed plastics for recycling. An object is to provide a sorting device.

[0006]

In order to solve the above-mentioned problems, a wind-powered electrostatic separator according to the present invention comprises a conductive rotor rotatable around a horizontal axis and an outer peripheral surface of the conductive rotor facing upward. A selection flow path for sending the objects to be sorted from the upper side to the lower side along the oblique tangential direction in the rotating portion, and the selection flow path is sandwiched between the conductive rotor and the ions toward the conductive rotor. An electrode unit that forms an ionic wind region in which wind is blown, a conductive selection object tray arranged below the outlet of the selection channel, and a semi-conductive selection object opened above the selection channel inlet. It is provided with a semi-conductive material separation duct for suction separation and an insulating material selection tray for collecting the insulating material adhered to the conductive rotor on the side opposite to the selection flow path of the conductive rotor. .

Further, the electrode unit having the above-mentioned structure is arranged in a plurality of needle-like electrode groups facing the conductive rotor, and is arranged between the needle-like electrode group and the conductive rotor to guide the object to be sorted. And a polarity of the needle electrode group is opposite to that of the conductive rotor, and the polarity of the metal mesh member is connected to the same side as the conductive rotor to form a needle electrode group. A corona discharge field is formed between the metal mesh material and the metal mesh material, and the ionic wind moving from the needle electrode group toward the metal mesh material is blown toward the conductive rotor through the metal mesh material. It is configured as follows.

In each of the above constructions, when the object to be sorted is put into the sorting channel, it is put into the ion wind region formed between the electrode unit and the conductive rotor, so that it receives the electron radiation and the ions. Due to the wind pressure, plastics, which are relatively light insulating objects to be sorted, particularly vinyl sheets and bags, are blown up to loosen the fibers of wood and paper, and are electrically charged. It is adsorbed by and is rotated and moved, and is separated and discharged to the insulative object to be sorted collecting member. In addition, since the semiconductive object to be sorted rises, since the attracting force to the conductive rotor is weak, the semiconductive object to be sorted is suctioned, separated and discharged. The conductive object to be sorted passes through the ionic wind region and is put into the conductive object to be sorted collecting member. Therefore, the insulating material in which the fibers of the wood or the paper are entangled is blown up to be loosened, which can greatly improve the recovery rate and the purity of the insulating material, particularly the lightweight plastics.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electrostatic sorting apparatus for crushed dust according to the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 1, a conductive rotor 11 is installed which is rotated around a horizontal axis in the direction of arrow A at a predetermined speed by a rotary drive device (not shown). Is negatively grounded via the lead wire 12. In the lower part of the outer peripheral surface of the conductive rotor 11 which rotates upward, a sorting channel 13 for transferring the crushed dust D which is the object to be sorted is formed in the direction of arrow B from above along the oblique tangential direction. There is. Further, an electrode unit 14 is disposed in the conductive rotor 11 so as to sandwich the sorting channel 13 and to form an ion wind region W.
A hopper 15 for supplying the crushed dust D, which is an example of an object to be sorted, is arranged above the conductive rotor 11, and the crushed dust D is fed to the sorting channel 13 via a constant-feeding vibration feeder 16 and an inclined chute 17. It is configured to supply a predetermined amount at a time.

Below the outlet of the sorting channel 13, a conductive dust collecting tray (conductive sorting target collecting member) that guides the conductive dust Da that has not passed through the ion wind region W and is not adsorbed by the conductive rotor 11. 21 are arranged. In addition, a semi-conductive dust collecting duct (semi-conducting object collecting member) 22 is opened near the upper portion of the inlet of the sorting channel 13, and the conductive rotor 1 is sucked by a suction force of a suction pump 19 connected midway.
The semi-conductive dust Db, which has a weak adsorption force to 1, is suction-separated. Further, a brush 24 for scraping off insulating dust Dc such as plastics adhering to the conductive rotor 11 is provided on the side of the conductive rotor 11 opposite to the selection channel 13.
An insulating dust collecting tray (insulating member to be sorted collecting member) 23 that separates and collects is disposed.

As shown in FIG. 2, the electrode unit 14 has a conductive plate 3 on the inner bottom surface facing the conductive rotor 11 with a box-shaped insulating support 31 having a U-shaped cross section or an open top.
2 is installed, and a needle-shaped electrode group 33 in which needle-shaped electrodes 33a are erected in a plurality of rows at regular intervals toward the conductive rotor 11 is provided on the conductive plate 32. Further, a large number of through holes 34a having a diameter smaller than that of the crushed dust D are formed on the open surface of the insulating support 31, and a metal mesh material 34 for guiding the crushed dust D introduced into the sorting channel 13 on the upper surface is provided. It is arranged. The positive side of the DC power supply 25 is the power supply line 2
It is connected to the conductive plate 32 via 6 and a predetermined voltage is applied to the needle electrode group 33. Further, the metal mesh material 34 is negatively grounded (grounded) via the lead wire 27, and a corona discharge area E is formed between the needle electrode group 33 and the metal mesh material 34, so that It is configured to generate an ion wind EW that blows toward the metal mesh material 34 in the protruding direction.

In the above structure, the crushing dust D is sent from the hopper 15 by the vibrating feeder 16 to the inclined chute 17 by a predetermined amount, and the inclined chute 17 selects the sorting channel 13.
Will be sent to Then, the crushed dust D is the electrode unit 1
4 and the conductive rotor 11, the pulverized dust D receives electron radiation and the wind pressure of the ionic wind, so that the pulverized dust D is relatively light insulating dust. As Dc plastics, especially vinyl sheets and bags, soar, a suction force is exerted by the electric charges that have been charged and given to the outer peripheral surface of the conductive rotor 11. Then, after being rotated and moved, it is separated and discharged to the insulating dust collecting tray 23 by its own weight and the scraping brush 24. Further, the semiconductive dust Db rises up by the ionic wind EW and has a weak adsorption force to the conductive rotor 11, so that it is sucked into the semiconductive dust collecting duct 22 and separated and discharged. Further, since the conductive dust Da is heavy and repels the conductive rotor 11, the conductive dust Da passes through the ion wind region W and is discharged to the conductive dust collecting tray 21 below.

According to the above-described embodiment, the ion wind EW is used to fly up an insulating material such as plastics having a small weight to remove fibers and the like entwined with the insulating material and further charge the conductive material. Since it is adsorbed on 11, the heavy conductive dust Dc can be reliably separated, and the semi-conductive dust D adsorbed on the conductive rotor 11 by the weak adsorption force.
Since b is also sucked and separated by the semi-conductive dust collecting duct 22, the collection rate and purity of insulating dust, particularly plastics, can be greatly improved compared with the conventional case.

When the amount and velocity of the ionic wind are not sufficient, a gas G such as air is forcibly forced from the gas inlet 35 formed on the side surface or the bottom surface of the electrode unit 14 as shown in FIG. By allowing the gas G to flow in, when the gas G flows in along with the ionized gas when passing through the corona discharge region E, the gas G is blown out from the through holes 34a of the metal mesh 34, whereby a sufficient ion wind can be obtained.

[0016]

As described above, according to the present invention, when the object to be sorted is put into the sorting channel, it is put into the ionic wind region formed between the electrode unit and the conductive rotor. As a result, it receives electron radiation and the wind pressure of ionic wind, and plastics, which are relatively light insulating objects to be sorted, particularly vinyl sheets and bags, are blown up to loosen the fibers of wood and paper. As it is charged, it is charged, adsorbed on the conductive rotor, rotationally moved, and separated and discharged to the insulating member to be sorted. In addition, since the semiconductive object to be sorted rises, since the attracting force to the conductive rotor is weak, the semiconductive object to be sorted is suctioned, separated and discharged. The conductive object to be sorted passes through the ionic wind region and is put into the conductive object to be sorted collecting member. Therefore, the insulating material in which the fibers of the wood or the paper are entangled is blown up to be loosened, which can greatly improve the recovery rate and the purity of the insulating material, particularly the lightweight plastics.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a wind power electrostatic sorting apparatus for crushed waste according to the present invention.

FIG. 2 is a partially enlarged sectional view of the electrode unit.

FIG. 3 is a schematic configuration diagram showing a conventional corona discharge type electrostatic sorting device.

[Explanation of symbols]

 11 Conductive Rotor 13 Sorting Flow Path 14 Electrode Unit 17 Inclined Chute 21 Conductive Waste Collection Tray 22 Semi-conductive Waste Collection Duct 23 Insulating Waste Collection Tray 25 DC Power Supply 33 Needle-shaped Electrode Group 33a Needle-shaped Electrode 34 Metal Mesh Material E Electrostatic Area W Ionic Wind Area EW Ionic Wind D Grinding Waste Da Conductive Grinding Waste Db Semi-conductive Grinding Waste Dc Insulating Grinding Waste

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Hiroyuki Carpenter, 3-8, Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Hidehiko Maebata 5-chome, Nishikujo, Konohana-ku, Osaka City, Osaka 3-28 Hitachi Shipbuilding Co., Ltd. (72) Inventor Chiaki Tojo 5-3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. A conductive rotor which is rotatable around a horizontal axis, and a portion to which an outer peripheral surface of the conductive rotor rotates upward, flows an object to be sorted downward along an oblique tangential direction. A sorting channel to be sent, an electrode unit that is disposed on the conductive rotor with the sorting channel sandwiched therebetween to form an ion wind region in which ion wind is blown toward the conductive rotor,
A conductive material to be sorted object disposed below the outlet of the sorting channel, a semi-conductive material to be sorted member which is opened above the inlet of the sorting channel to suction-separate the semi-conductive material to be sorted, A wind power electrostatic sorting device, comprising: an insulating sorted object collecting member that collects an insulating sorted object attached to the conductive rotor on the side opposite to the sorting passage of the insulating rotor. 2. A needle-shaped electrode group in which a plurality of electrode units are arranged so as to face a conductive rotor, and a metallic member arranged between the needle-shaped electrode group and the conductive rotor to guide the object to be sorted. A mesh material is used, and the polarity of the needle electrode group is opposite to that of the conductive rotor, and the polarity of the metal mesh material is connected to the same pole side as the conductive rotor to connect the needle electrode group and the metal electrode. A corona discharge field is formed between the mesh material and the ion wind moving from the needle electrode group toward the metal mesh material is blown out toward the conductive rotor through the metal mesh material. Claim 1 characterized in that
Wind power electrostatic sorting device described.