JP2000246141A - Triboelectrifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To render electrification to every plastic fragment according to the electrifying order by its kind to surely recover the fragments even in a small triboelectrifying vessel. SOLUTION: In a triboelectrifying vessel 11 of a triboelectrifying device 3, an agitating ribbon screw 13 is arranged freely ratably around the axial center and a driving unit for rotating it around the axial center is installed, and on the inner surface of the triboelectrifying vessel 11 and on the surface of the agitating ribbon screw 13, plastic fragment 1 to be separated is coated with resin corresponding to the intermediate position of the triboelectrification order. Therefore, without upsizing the triboelectrifying device 3, sufficient electrification is rendered to the plastic fragment 1 to be separated and the plastic fragment 1 is subjected to electrostatic discharge at an electrostatic separation part G and surely recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triboelectric charging device in a plastic sorting device for sorting classified 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 frictional charging device that can solve the above-mentioned problems.

[0006]

Means for Solving the Problems In the present invention, a plurality of types of crushed plastic pieces are stir-charged by friction and charged by a static electricity separating portion disposed below, so that a plastic piece is provided on one side. A friction charging container having a charging port for charging the pieces and a discharge port for discharging the plastic pieces to the electrostatic separation unit on the other side is provided, and a stirrer rotatable around a predetermined axis in the friction charging container. A ribbon screw is disposed, and a driving device for rotating the stirring ribbon screw about the axis is provided.The plastic piece to be separated is frictionally charged on the inner surface of the friction charging container and the surface of the stirring ribbon screw. The resin corresponding to the reverse polarity or the intermediate position in the order is coated.

In the above structure, a plurality of types of plastic pieces are put into the triboelectric charging container in a mixed state, and each of the plastic pieces is agitated by a stirring ribbon screw rotating around an axis by driving of a driving device. According to the type of charging sequence, a predetermined amount of charge is added and discharged from the outlet.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, a plastic sorting device S according to an embodiment of the present invention will be described with reference to FIG.
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.

[0009] As shown in FIG.
Is provided with a cylindrical triboelectric charging container 11 having an input port 18 for inputting the plastic piece 1 on one side and an output port 19 for discharging the plastic piece 1 to the electrostatic separation unit G on the other side. A stirring ribbon screw 13 that is rotatable around a predetermined virtual axis 12 is disposed in the charging container 11,
A driving device 14 for rotating the stirring ribbon screw 13 around the shaft core 12 is provided, and the inner surface of the frictional charging container 11 and the surface of the stirring ribbon screw 13 are
A resin corresponding to an intermediate position in the triboelectric charging sequence with the plastic piece 1 to be separated, that is, polypropylene (PP) is coated.

The driving device 14 includes a bearing 15 for supporting one end of the ribbon screw 13 for stirring, a bearing 16 for supporting the other end, and a drive belt 17 wound around a bearing 16 for supporting the other end. And a drive motor 21 having a drive pulley 20 for winding the drive belt 17 attached to an output shaft. The electrostatic separation unit G includes a stirring vessel 1
A metal drum electrode 5 disposed below the discharge port 19 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. A brush 10 for scraping off the plastic piece 1 attached to the peripheral surface of the metal drum electrode 5;

The metal drum electrode 5 is configured to be rotatable in a predetermined direction around a horizontal axis 5a, 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 sequentially arranged below the metal drum electrode 5 in the direction of rotation of the metal drum electrode 5, and the first separation and stirring vessel 8 and the second separation and stirring vessel 9 are separated from each other. 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. The plurality of types of plastic pieces 1 are put into the triboelectric charging container 11 in a mixed state, and are driven by the drive motor 21 to stir the stirring ribbon screw 13 rotating around the shaft core 12 via the drive belt 17 so that the plastic pieces are stirred. A predetermined amount of charge is added to each piece 1 according to the type of charging sequence, and the discharge port 1
It is discharged from 9.

Thereafter, the plastic piece 1 scattered on the upper surface of the metal drum electrode 5 of the electrostatic separation portion G through the chute 25 and 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 metal drum electrode 5 is
And is separated by being scraped off from the surface of 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, a plastic piece 1 containing a mixture of vinyl chloride resin (PVC), polypropylene resin (PP), polyethylene resin (PE), and polystyrene resin (PS)
An experiment was conducted to recover vinyl chloride resin from among them. As a result, the recovery rate of vinyl chloride resin was 90% or more and the purity was 95%.
% Results were obtained.

As described above, according to the embodiment of the present invention, the frictional charging device 3 is provided with the cylindrical frictional charging container 11, and rotates around the predetermined virtual axis 12 in the frictional charging container 11. A free stirring ribbon screw 13 is provided, and a driving device 14 for rotating the stirring ribbon screw 13 around the shaft core 12 is provided. The drive device 14 is provided on the inner surface of the friction charging container 11 and the surface of the stirring ribbon screw 13. A resin corresponding to an intermediate position in the triboelectric charging sequence with the plastic piece 1 to be separated, that is, polypropylene (PP) is coated. Accordingly, the surface area of the stirring ribbon screw 13 is large, so that the plastic piece 1 to be separated from the plastic piece 1 mixed with the plastic piece 1 can have a sufficient charge amount without increasing the size of the frictional charging device 3. Therefore, in the electrostatic separation unit G, the plastic piece 1 to be separated is electrostatically separated by the electrostatic separation unit G and separated into the first separation container 8 or the second separation container 9 to ensure the separation. Can be recovered.

In the above embodiment, the inner surface of the triboelectric charging container 11 and the surface of the stirring ribbon screw 13 are coated with the plastic piece 1 to be separated and the resin corresponding to the intermediate position in the triboelectric charging sequence. The present invention is not limited to this. Even if the inner surface of the frictional charging container and the surface of the stirring ribbon screw are coated with a resin having the opposite polarity in the frictional charging sequence with the plastic piece 1 to be separated, the same effect as described above can be obtained. It can be effective.

[0017]

As is apparent from the above description, the present invention relates to a triboelectric charging container having a charging port for charging a plastic piece on one side and a discharging port for discharging the plastic piece to an electrostatic separation unit on the other side. A stirring ribbon screw rotatable around a predetermined axis is disposed in the friction charging container, and a driving device for rotating the stirring ribbon screw about the axis is provided. Since the inner surface of the container and the surface of the stirring ribbon screw are coated with a plastic piece to be separated and a resin corresponding to the opposite polarity or intermediate position in the triboelectric charging sequence, even a small triboelectric charging container, A predetermined amount of charge can be added to each plastic piece according to the charging sequence according to its type, and it 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 a perspective view showing a configuration of the frictional charging device.

FIG. 3 is an overall configuration diagram of a conventional plastic sorting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic piece 3 Friction charging device 5 Metal drum electrode 6 High voltage electrode 7 High voltage power supply 8 First separation container 9 Second separation container 11 Friction charging container 13 Stirring ribbon screw 14 Driving device 21 Drive motor G Electrostatic separation unit S Plastic sorting equipment

Continued on the front page (72) Inventor Tetsuya Inoue 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Hidehiko Maehata 1- 7-89, Minami-Kohita, Suminoe-ku, Osaka-shi, Osaka No. F-term in Hitachi Zosen Corporation (reference) 4D054 GA01 GA10 GB01 GB09

Claims (1)

[Claims] 1. A friction charging device for stirring and frictionally charging a plurality of types of crushed plastic pieces and separating the crushed plastic pieces by an electrostatic separation unit disposed below, wherein a charging port for charging the plastic pieces to one side. A friction charging container having a discharge port for discharging the plastic piece to the electrostatic separation unit on the other side is provided, and a stirring ribbon screw rotatable around a predetermined axis is disposed in the friction charging container, A driving device for rotating the stirring ribbon screw around the axis is provided, and the inner surface of the friction charging container and the surface of the stirring ribbon screw are opposite in polarity or intermediate in the frictional sequence with the plastic piece to be separated. A frictional charging device, wherein a resin corresponding to a position is coated.