JP2000246143A - Plastics sorting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply electrification to every plastic fragment according to the electrification order by its kind even in a small electrifying vessel to surely recover plastic fragments. SOLUTION: This device is provided with a triboelectrifying vessel 11 having a first disc like triboelectrifying plate 12 and second triboelectrifying plate 13 overlapped each other. In the first triboelectrifying plate 12, plural first recessed parts 14 and first projected parts 15 are formed, and in the second triboelectrifying plate 13, second projected parts 16 put in the first recessed parts 14 of the first triboelectrifying plate 12 and second recessed parts 17 in which the first projected parts 15 are formed, and a rotary driving part 20 for rotating the second triboelectrifying plate 13, thereby sufficiently agitating plastic fragments 1 without upsizing a frictional vessel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic sorting apparatus for sorting crushed refuse consisting of plastic pieces by type.

[0002]

2. Description of the Related Art In recent years, recycling of refuse has been rapidly promoted. By the way, as a technique for sorting pulverized plastic pieces, there is a plastic sorting apparatus as shown in FIG. This plastic sorting apparatus includes a hopper 2 for charging a plurality of types of plastic pieces 1,
And a frictional charging device 3 for charging the plastic pieces 1 to a unique charge amount, and a frictional charging device 3 disposed below the frictional charging device 3
And an electrostatic separation device G for separating the toner according to the charge amount.

The friction charging device 3 includes a friction container 3a and a plurality of stirring members 3c rotatably mounted on the friction container 3a around a horizontal axis 3b. In this plastic sorting device, when the plastic 1 is put into the hopper 2, the plastic 1 is put into the friction charging device 3 from the hopper 2, and is stirred by the stirring member 3c to be frictionally charged to a unique charge amount. And collected in separate containers 8 and 9 for each charge amount.

[0004]

SUMMARY OF THE INVENTION In the above-mentioned plastic sorting apparatus, the plastic separation is reliably performed by the electrostatic separation device G.
It is necessary to sufficiently stir the plastic 1 in the frictional charging device 3 in order to electrostatically separate the toner. However, the conventional frictional charging device 3 includes the stirring member 3c that simply rotates in the friction container 3a. Just because plastic 1
In order to sufficiently stir, it was necessary to extend the time for tribocharging by enlarging the friction container 3a and increasing the number of stirring members 3c. However, in this case, there is a problem that the installation area of the frictional charging device 3 becomes large.

Therefore, an object of the present invention is to provide a plastic sorting apparatus capable of solving the above-mentioned problems.

[0006]

The object of the present invention is to provide a friction charging device for stirring and frictionally charging a plurality of types of crushed plastic pieces, and a charging device disposed below the friction charging device. An electrostatic separation unit for electrostatically separating and sorting the plastic pieces according to the charge amount is provided, and a friction charging container is provided for mounting the plastic pieces in the friction charging device and frictionally charging the plastic pieces. The triboelectric charging container includes a first triboelectric charging plate and a second triboelectric charging plate, whose plate surfaces are opposed to each other, and a plurality of first protrusions are provided on the plate surface of the first triboelectric charging plate. A second convex portion is formed concentrically on the plate, and a second convex portion adjacent to the second frictional charging plate is provided with a predetermined gap to frictionally charge the first convex portion and the plastic piece 1 on the second frictional charging plate. Formed, first triboelectric charging plate or second triboelectric charging A rotation drive unit is provided for rotating at least one of the plastic pieces while holding the gap to apply a centrifugal force to the plastic pieces, and a charging port for charging the plastic pieces into the frictionally charged container is formed. In addition, a discharge port for discharging the frictionally charged plastic piece to the electrostatic separation unit is formed in the outer peripheral portion of the frictionally charged container.

Further, the plate surface of the triboelectric charging container is coated with a plastic piece to be stirred and a resin corresponding to the opposite polarity or the intermediate position in the triboelectric charging sequence. In the above configuration, a plurality of types of plastic pieces are supplied to the inside of the triboelectric charging container in a mixed state, and the first triboelectric charging plate or the second triboelectric charging plate is rotated by the driving of the rotation driving unit,
Due to the centrifugal force at that time, the plastic piece moves toward the outer periphery of the triboelectric charging container, and the plastic piece moves between the first convex portion and the second convex portion while following the charging sequence according to the type for each plastic piece. A predetermined amount of charge is added to the sheet, the sheet is discharged from the discharge port, and supplied to the electrostatic separation section, where the plastic pieces are electrostatically separated by type and collected.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, a plastic sorting apparatus S for performing a plastic sorting method according to an embodiment of the present invention will be described with reference to FIGS. The plastic sorting device S includes a frictional charging device 3 that frictionally charges a plurality of different resin-based plastic pieces (sorted and crushed refuse) 1 in a mixed state. An electrostatic separation unit G for electrostatically separating the plastic pieces 1 charged to different amounts of charge for each type of the pieces 1, and the plastic pieces 1 electrostatically separated by the electrostatic separation unit G are collected for each type. A first separation container 8 and a second separation container 9.

The friction charging device 3 is provided with a friction charging container 11 for charging the interior of the plastic piece 1 by friction charging. The friction charging container 11 has a plate surface as shown in FIGS. Disc-shaped first frictional charging plate 12 and second frictional charging plate 1 facing each other via hinge member 11a
3 is provided. A plurality of first concave portions 14 and first convex portions 15 are formed concentrically on the plate surface of the first frictional charging plate 12, and a second concave portion 14 of the first frictional charging plate 12 is formed on the second frictional charging plate 13. A plurality of second convex portions 16 and first convex portions 15
Is formed concentrically with the first frictional charging plate 12.

As shown in FIG. 3, when the plate surfaces of the first frictional charging plate 12 and the second frictional charging plate 13 face each other,
Between the first concave portion 14 and the second convex portion 15 and between the second concave portion 17 and the first convex portion 16, that is, the second convex portion 15 and the first convex portion 1.
The gap 6 is a gap sufficient for the plastic piece 1 to be triboelectrically charged and move. The friction charging container 1
In the center of the plate surface of the first friction material 1, an insertion port 18 for charging the plastic piece 1 into the frictionally charged container 11 is formed.
The discharge port 19 for discharging to the electrostatic separation part G is formed.

A rotary drive unit 20 is provided for rotating the second triboelectric charging plate 13 about the plate surface to apply a centrifugal force to the plastic piece 1. The rotary drive unit 20 includes a drive shaft 21a having a second drive shaft 21a. A rotary drive motor 21 inserted at a position offset from the center of the frictional charging plate 13, a driving gear 22 attached to a driving shaft 21 a, and meshed with the driving gear 22 provided annularly inside the second frictional charging plate 13. And the ring gear 23 which is formed.

Note that, as shown in FIG.
Is connected to the feeding hopper 2 through a chute 24. The electrostatic separation unit G is provided at the outlet 1 of the stirring vessel 13.
9, a metal drum electrode 5 disposed via a chute 25, a high-voltage electrode 6 disposed obliquely above the metal drum electrode 5, and a metal drum electrode 5 disposed below the metal drum electrode 5. Plastic piece 1 attached to the peripheral surface
And a brush 10 for scraping off the brush.

The metal drum electrode 5 is rotatable around a horizontal axis 5a in a predetermined direction and is grounded. The high-voltage electrode 6 is connected to the cathode of a high-voltage power supply 7, and the anode of the high-voltage power supply 7 is grounded. By this connection, a rotating ground electrode is formed by the metal drum electrode 5, and a sorting electrostatic field is formed between the high-voltage electrode 6 and the metal drum electrode 5.

The first separation and stirring vessel 8 and the second separation and stirring vessel 9 are disposed below the metal drum electrode 5 in the rotation direction of the metal drum electrode 5 in order, and the first separation and stirring vessel 8 and the second separation and stirring vessel Both the stirring containers 9 are open upward. Next, a plastic sorting method in the plastic sorting apparatus S having the above configuration will be described. A plurality of types of plastic pieces 1 are put into the input hopper 2 in a mixed state,
After passing through the chute 24, the triboelectric charging container 1
1. On the other hand, when the rotary drive motor 21 is driven, the drive gear 22 attached to the drive shaft 21 a rotates, and the second frictional charging plate 13 is moved through the ring gear 23 inside the second frictional charging plate 13 into the input port 18. Rotate around the central axis of.

Then, due to the centrifugal force of the second triboelectric charging plate 13, the plastic piece 1 moves toward the outer periphery of the triboelectric charging container 11, and the plastic piece 1 moves between the first concave portion 14 and the second convex portion 15 and While moving between the second concave portion 17 and the first convex portion 16, that is, between the second convex portion 15 and the first convex portion 16, a predetermined charge amount is added to each plastic piece 1 in accordance with the type of charging sequence. You.

Thereafter, the plastic piece 1 is supplied from the discharge port 19 through the chute 25 to the electrostatic separation portion G, is dispersed on the upper surface of the metal drum electrode 5, and is charged with a negative charge by the frictional charging device 3. Is repelled by the high voltage electrode 6 and is attracted to the metal drum electrode 5 and falls into the second separation container 9 by rotation of the metal drum electrode 5 or the brush 1
Due to 0, it is scraped off from the surface of the metal drum electrode 5 and separated, and falls into the second separation container 9.

The plastic piece 1 charged with a positive charge opposite to that of the metal drum electrode 5 is adsorbed by the high voltage electrode 6 and falls into the first separation container 8. In this way, the plastic pieces 1 are electrostatically separated by type and collected. More specifically, the plate surfaces of the first triboelectric charging plate 12 and the second triboelectric charging plate 13 are coated with polypropylene, and vinyl chloride resin (PVC) and polypropylene resin (P
When a mixed plastic piece 1 of P), polyethylene resin (PE), and polystyrene resin (PS) was frictionally charged to separate the vinyl chloride resin, the recovery rate of the vinyl chloride resin was 90%. Exceeded, purity is 95%
Was obtained.

As described above, according to the embodiment of the present invention, the plastic piece 1 to be supplied to the electrostatic separation unit G and separated therefrom.
A frictionally charging container 3 having a disk-shaped first frictionally charging plate 12 and a second frictionally charging plate 13 whose plate surfaces are superimposed on each other. A plurality of first concave portions 14 and first convex portions 15 are formed on the plate surface of the second frictional charging plate 13. A second concave portion 17 into which the convex portion 15 is formed is formed, and when the plate surfaces of the first frictional charging plate 12 and the second frictional charging plate 13 are overlapped with each other, between the first concave portion 14 and the second convex portion 15 and There is a gap between the second concave portion 17 and the first convex portion 16 that is sufficient for the plastic piece 1 to move, and the centrifugal force is applied to the plastic piece 1 by rotating the second frictional charging plate 13 around the plate surface. The rotation drive unit 20 is provided to perform the friction simply as in the prior art. Agitating member 3c rotating in the container 3a
There is no need to increase the number of stirring members 3c by enlarging the friction container 3a in order to sufficiently stir the plastic 1, and even if the friction charging container 11 is small, the type of each plastic piece 1 , A predetermined amount of charge is added according to the charging sequence, and separated into the first separation container 8 or the second separation container 9 to be reliably collected.

In the above embodiment, the rotation drive unit 20
However, the present invention is not limited to this. The rotation driving unit 20 is provided on the first frictional charging plate 12 side, and the first frictional charging plate 12 is rotated to rotate the first frictional charging plate 12. A plastic piece 1 is frictionally charged by a friction
May be configured to be moved toward the outer circumference of the.

[0020]

As is apparent from the above description, according to the present invention, a frictional charging container for mounting a plastic piece in a frictional charging device and performing frictional charging is a first frictional device in which the plate surfaces are arranged to face each other. A charging plate and a second frictional charging plate, a plurality of first convex portions are formed on the plate surface of the first frictional charging plate concentrically with the first frictional charging plate, and the first frictional charging plate has a first convex portion. Adjacent second convex portions are formed concentrically on the second frictional charging plate with a predetermined gap therebetween to frictionally charge the plastic piece 1,
A rotation drive unit for applying a centrifugal force to the plastic piece by rotating at least one of the first frictional charging plate and the second frictional charging plate while holding the gap is provided, and the friction charging container has a plastic Since a discharge port for discharging pieces is formed in the outer peripheral portion of the triboelectric charging container and a discharge port for discharging the plastic piece after friction charging to the electrostatic separation section is formed, a small triboelectric charging is performed. Even in the case of a container, a predetermined amount of charge can be added to each plastic piece according to the type of charging sequence according to its type, and the plastic piece can be reliably collected.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a plastic sorting device showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the frictionally charged container.

FIG. 3 is a cross-sectional view showing a use state of the frictionally charged container.

FIG. 4 is an overall configuration diagram of a conventional plastic sorting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic piece 3 Friction charging device 5 Metal drum electrode 6 High voltage electrode 8 First separation container 9 Second separation container 11 Friction charging container 12 First friction charging plate 13 Second friction charging plate 14 First concave portion 15 First convex portion DESCRIPTION OF SYMBOLS 16 Second convex part 17 Second concave part 20 Rotation drive part 21 Rotation drive motor 22 Drive gear 23 Ring gear G Electrostatic separation part S Plastic sorting device

Continuing on the front page (72) Inventor Daisuke Tamakoshi 1-7-89, Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Masanori Tsukahara 1-7-89, Minami-Kohoku, Suminoe-ku, Osaka-shi, Osaka No. Hitachi Shipbuilding Co., Ltd. (72) Inventor Hidehiko Maehata 1-7-89 Minami Kohoku, Suminoe-ku, Osaka City, Osaka Prefecture F-term (reference) 4D054 GA01 GA09 GA10 GB01 GB09 4F301 AA13 AA14 AA15 AA17 BA02 BA21 BF08 BF31

Claims (2)

[Claims] 1. A friction charging device for stirring and frictionally charging a plurality of types of crushed plastic pieces, and a statically separated plastic piece disposed below the friction charging device according to a charge amount. A plastic sorting device having an electrostatic separation unit for sorting and sorting, wherein a frictionally charging container is provided for frictionally charging the plastic charging device by mounting a plastic piece in the frictionally charging device. A first frictional charging plate and a second frictional charging plate are arranged such that the plate surfaces face each other, and a plurality of first convex portions are formed on the plate surface of the first frictional charging plate on the concentricity of the first frictional charging plate. A second convex portion is formed on the second triboelectric charging plate, and a second convex portion adjacent to the second triboelectric charging plate is formed concentrically with a predetermined gap to frictionally charge the first convex portion and the plastic piece 1. At least one of a triboelectric charging plate and a second triboelectric charging plate A rotation drive unit is provided for applying a centrifugal force to the plastic pieces by rotating one of the plastic pieces while holding the gap, and an input port for feeding the plastic pieces into the frictionally charged container is formed, A plastic sorting device, wherein a discharge port for discharging a frictionally charged plastic piece to the electrostatic separation unit is formed in an outer peripheral portion of the frictionally charged container. 2. The plastic sorting apparatus according to claim 1, wherein the plate surface of the triboelectric charging container is coated with a plastic piece to be stirred and a resin corresponding to the opposite polarity or the intermediate position in the triboelectric charging sequence.