JP7047796B2 - Resin piece sorting device and resin piece sorting method - Google Patents

Description

The present invention relates to a technique for selecting a resin piece in which a plurality of types are mixed.

Resin used for housings of used home appliances and the like is generally reused. In reuse, first, the housing of a used home appliance is crushed to obtain a resin piece in which a plurality of types are mixed. Then, in order to use this resin piece as a resin raw material that can be used as a new material again, the resin pieces are sorted by type and collected.

Here, the resin pieces in which a plurality of types obtained by crushing used household appliances are mixed are mainly polypropylene resin (hereinafter referred to as “PP”), acrylonitrile / butadiene / styrene copolymer synthetic resin (hereinafter referred to as “ABS”), and polystyrene. Resin (hereinafter referred to as "PS") and the like are included.

As a method for sorting and collecting resin pieces in which a plurality of types are mixed by type, for example, in Patent Document 1, the resin pieces composed of ABS and PS are affected by the difference in triboelectric characteristics depending on the material of the resin pieces and the electrostatic field. An electrostatic sorting method for separating and recovering by the difference in Coulomb force is disclosed.

More specifically, the charged resin piece was dropped into the electrostatic field between the electrodes, and the charged resin piece was separated by the electrostatic field according to the polarity and the amount of charge, and passed through the electrostatic field to be separated. The resin pieces are collected by type by the collection unit at the bottom. In the collection section, a collection section for each type is formed by a plurality of partition sections.

Japanese Unexamined Patent Publication No. 2018-65123

In the resin piece sorting device as described above, the falling separated resin pieces come into contact with the upper end surface of the partition part of the recovery part and bounce off, and as a result, the resin reaches a recovery part different from the proper recovery part. There is a problem that the pieces bounce off and are mixed in the collection part for collecting a different type other than the target collection part, and the purity of the resin piece to be collected is lowered. This problem becomes more pronounced as the distance between the collection units is shorter.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to sort resin pieces with higher purity even when the recovery parts are close to each other.

In order to solve the above problems, a drop part for dropping a plurality of types of resin pieces, a separation part for separating the resin pieces for each type during the fall, and a resin piece installed below the separation part and separated. A plurality of collection sections for collecting each type, and an intermediate recovery section that is installed between the recovery section and the recovery section to collect resin pieces, and a recovery section and an intermediate recovery section are partitioned and inclined in the longitudinal direction of the upper end surface. It is characterized by comprising a partition portion provided with a partition plate having corners.

According to the present invention, there is an effect that the resin pieces can be recovered with high purity depending on the type.

It is an overall block diagram of the resin piece sorting apparatus. It is a perspective view of the resin piece sorting apparatus. It is an enlarged view of the inclined part of a partition part. It is a figure which shows the model when the resin piece collides with the inclined surface. It is a graph which shows the relationship between the velocity component Vy and θ of a resin piece when a resin piece collides and bounces off. It is a graph which shows the relationship between the velocity component Vz and θ of a resin piece when a resin piece collides and bounces off. It is a figure which shows the case where the inclination angle of the upper end surface of a partition portion is made larger than 90 degrees. It is a figure which shows that the upper end surface of a partition part is an arc-shaped inclined part. It is an overall block diagram of the resin piece sorting apparatus which sorts three kinds of resin pieces.

Hereinafter, embodiments of the resin piece sorting apparatus 1 and the resin piece sorting method according to the present embodiment will be described with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is an overall configuration diagram of a resin piece sorting device 1 for carrying out the present invention. The resin piece sorting device 1 separates and collects two different types of resin pieces 2a and 2b into each type. The resin piece sorting apparatus 1 of the present embodiment separates and collects two types of resin pieces 2a and 2b into each type, but the present invention is not limited to this, and the resin piece sorting apparatus 1 is limited to three or more types of resin pieces. It may be a resin piece sorting device for sorting and collecting, and the number of types of resin pieces is not limited.

The resin piece sorting device 1 frictionally charges a supply unit 4 that supplies a plurality of types of resin pieces 2a and 2b that are raw materials to be sorted, and a plurality of types of resin pieces 2a and 2b supplied from the supply unit 4. It includes a charging unit 3 and a dropping unit 5, which is a vibration feeder that conveys and drops a plurality of types of resin pieces 2a and 2b charged by the charging unit 3.

Here, the resin pieces 2a and 2b refer to ABS and PS, but are not limited to these, and may be anything as long as they can be separated and sorted such as PP. Further, the resin piece sorting device 1 includes a ground electrode 6b and a high voltage electrode 6a having a higher potential than the ground electrode 6b below the end portion of the drop portion 5 in the transport direction (positive direction in the x direction in FIG. 1). It has a pair of electrodes. A power source 7 for generating an electrostatic field is connected to the high voltage electrode 6a.

The plurality of resin pieces 2a and 2b that have passed between the electrodes are separated by type during the fall. In the present embodiment, the ground electrode 6b, the ground electrode 6b, and the charging unit 3 are collectively referred to as a separation unit that separates the resin pieces 2a and 2b. In the present embodiment, the separating portion is due to the charging and electrostatic field of the resin pieces 2a and 2b, but the present invention is not limited to this, and any method can be used as long as the resin pieces 2a and 2b can be separated for each type.

Further, the resin piece sorting device 1 includes a recovery unit 10a for collecting the resin piece 2a sorted by the electrostatic field and a recovery unit 10b for collecting the resin piece 2b below the electrode. Between these recovery units 10a and 10b, recovery is performed by recovery units 10a and 10b, which cannot be electrostatically separated due to a small amount of charge or a large weight, or which cannot be recovered because they do not enter the recovery units 10a and 10b well. An intermediate recovery unit 14 for recovering the leaked resin pieces 2a and 2b is installed.

The intermediate number unit 14 is installed between the adjacent collection units 10a and 10b. Further, the outer circumferences of the recovery sections 10a and 10b and the intermediate recovery section 14 are surrounded by the side plates 15a, 15b, 15c and 15d, and the recovery sections 10a and 10b and the intermediate recovery section 14 are partitioned by providing a partition plate. It is partitioned by the portions 11a and 11b.

The recovery unit 10a, 10b and the intermediate collection unit 14 have discharge units 16a, 16b, 16c at the lower part. Further, the discharge section 16c of the intermediate recovery section 14 is provided with a circulation recovery conveyor device such as a pneumatic type or a belt type that returns the resin pieces 2a and 2b recovered and leaked by the recovery units 10a and 10b to the charging unit 3. A line 30 is provided. The resin pieces 2a and 2b discharged from the intermediate recovery unit 14 are supplied to the supply unit 4 again.

FIG. 2 is a perspective view of the resin piece sorting device 1. Since the structure of the upper end surfaces of the partition portions 11a and 11b is difficult to understand in the overall configuration diagram of FIG. 1, the structure of the upper end surfaces of the partition portions 11a and 11b will be described with reference to this perspective view. The same parts as those in FIG. 1 will be omitted.

The partition plates of the partition portions 11a and 11b have an inclination angle in the longitudinal direction of the upper end surface. The entire portion having the inclination angle of the upper end surface of the partition plate is referred to as an inclined portion 12. The inclined portions 12 of the partition portions 11a and 11b decompose the rebounding direction of the resin pieces 2a and 2b colliding with the upper end surfaces in the y direction in FIG. 2 and alleviate the rebounding in the z direction, and the resin pieces 2a and 2b. Reduce the flight distance in the x direction. A detailed description of the inclined portion 12 will be described later.

Here, how the resin pieces 2a and 2b are separated and sorted and collected will be described in detail. The resin pieces 2a and 2b charged in the supply unit 4 are charged in the charging unit 3, charged into the vibration feeder from the charging unit 3, and then conveyed on the diaphragm. The vibration feeder drops the resin pieces 2a and 2b and guides them to the electrostatic field generated by the electrodes from vertically above.

The resin pieces 2a and 2b are triboelectrically charged by the charging unit 3, and are charged either positively or negatively according to the triboelectric charging column. When the charged resin pieces 2a and 2b pass through an electrostatic field, they are attracted to different electrodes by either positive or negative charging, and are separated by type.

For example, when ABS and PS are agitated and triboelectrically charged by the charging unit 3 as resin pieces 2a and 2b, ABS is charged to (+) and PS is charged to (-), and the difference in charging polarity and the electrostatic separation part It is separated for each type by the difference in Coulomb force from the electrostatic field. In this way, the separation unit separates the resin pieces 2a and 2b for each type. Of the separated resin pieces 2a and 2b, the ABS charged in (+) receives the Coulomb force from the electrostatic field in the direction of the grounded ground electrode 6b and is recovered by the recovery unit 10a.

On the other hand, the PS charged in (-) receives the Coulomb force from the electrostatic field in the direction of the high voltage electrode 6a and is recovered by the recovery unit 10b. Then, the ABS and PS that have not been electrostatically separated due to a small amount of charge or a large weight are recovered by the intermediate recovery unit 14. As the ABS and PS, for example, it is assumed that those crushed to about 10 mm in advance are used, but the ABS and PS are not limited to this.

FIG. 3 is an enlarged view of the inclined portion 12 of the partition portions 11a and 11b. The upper end surfaces of the partition portions 11a and 11b have a plurality of inclined surfaces 12a and 12f. In the example of FIG. 3, the inclined portion 12 is composed of a plurality of inclined surfaces 12a and 12f, but the present invention is not limited to this, and the inclined portion 12 may be composed of one inclined surface.

As shown in FIG. 3, the inclined portion 12 in the present embodiment has a plurality of inclined surfaces 12a and 12f in the longitudinal direction (y direction) of the upper end surfaces of the partition portions 11a and 11b, and is inclined with the plurality of adjacent inclined surfaces 12a. The surface 12f, that is, a plurality of inclined surfaces 12a and 12f are configured by a triangular wave shape as shown in FIG. The angles of the inclination angle 12b and the inclination angle 12e may be the same or may be different in size.

In the present embodiment, the plurality of inclined surfaces 12a and 12f have a triangular wave shape, but the present invention is not limited to this, and the inclined portion 12 has an inclination angle in the longitudinal direction of the upper end surfaces of the partition portions 11a and 11b. It is not limited as long as it is in shape.

When the resin pieces 2a and 2b are collected, the resin pieces 2a and 2b that collide with the upper end surfaces of the partition portions 11a and 11b are decomposed in the y direction in the drawing by the inclined portion 12 formed in the longitudinal direction of the upper end surface. As a result, the velocity component (momentum) in the x direction becomes smaller.

Further, since the resin pieces 2a and 2b that collide with the inclined portion 12 have a small impact force for bouncing in the z direction, the flight time after bouncing is also shortened. As a result, the flight distance of the resin pieces 2a and 2b in the x direction can be reduced. Even if the resin pieces 2a and 2b collide with the upper end surfaces of the partition portions 11a and 11b of the present embodiment and bounce off, the flight distance in the x direction is suppressed to be small. As a result, the rebounded resin pieces 2a and 2b are easily collected by the appropriate collection units 10a and 10b partitioned by the partition portions 11a and 11b.

Conventionally, since the upper end surfaces of the partition portions 11a and 11b are flat, the velocity components (momentum) of the resin pieces 2a and 2b after the collision are generated only in the x direction and the z direction (positive direction). Therefore, resin pieces 2a and 2b having a large flight distance in the x direction are likely to be generated, and the resin pieces 2a and 2b fall to a collection unit different from the collection unit to be properly sorted. That is, in the prior art, the resin piece collides with the upper end surface of the partition portion and rebounds greatly, so that erroneous sorting that cannot be collected by an appropriate collection portion is likely to occur.

In the present embodiment, the upper end surfaces of the partition portions 11a and 11b have an inclination angle in the longitudinal direction, so that the collision between the resin pieces 2a and 2b and the partition portions 11a and 11b is changed to an oblique collision. In an oblique collision, a component in the y direction is generated in the velocity component of the resin pieces 2a and 2b after the collision. Further, since the collision occurs diagonally, the impact force in the z direction is small (passed) at the time of collision, and the component in the z direction is also small.

By this mechanism, the resin piece 2a that collides with the upper end surface of the partition portion 11a is less likely to jump into the recovery unit 10b that is not the proper collection unit 10a, and the resin piece 2b that collides with the upper end surface of the partition portion 11b is appropriate. It is less likely to jump into the collection unit 10a, which is not the collection unit 10b. This effect becomes more remarkable as the distance between the recovery unit 10a and the collection unit 10b becomes closer.

By this mechanism, it is possible to prevent the resin pieces 2a and 2b colliding with the upper end surfaces of the partition portions 11a and 11b from being erroneously sorted and reducing the purity of the recovered resin. The separation accuracy can be improved without lowering the recovery rate of the recovered ABS and PS. In particular, the mechanism of the present embodiment can exert a sufficient effect for high-precision separation exceeding 97 to 98%. Next, the angles of the inclined surfaces 12a and 12f that make the effect of the present embodiment more remarkable will be described.

FIG. 4 is a diagram showing a model when the resin pieces 2a and 2b collide with the inclined surfaces 12a and 12f. A mass point falls on the inclined surfaces 12a and 12f having an inclination angle θ from vertically above (negative direction in the z direction) at a velocity V (velocity immediately before the collision), and the direction changes after the collision with the inclined surfaces 12a and 12f. Is reflected at a velocity V (velocity immediately after a collision) of the same magnitude. At this time, assuming that the incident angle θ and the reflection angle θ'are expressed as the incident angle θ and the reflection angle θ', and the coefficient of restitution is 1, and the incident angle = the reflection angle (θ = θ'), the velocity components Vy in the y direction and the z direction after the oblique collision are obtained. It can be seen that Vz can be expressed by Vy = V · sin2θ and Vz = V · cos2θ, respectively.

FIG. 5 is a graph showing the relationship between the velocity components Vy and θ of the resin pieces 2a and 2b when the resin pieces 2a and 2b collide and bounce off. When Vy = V · sin2θ is represented by a graph, it becomes as shown in FIG. 5, and it can be seen that Vy becomes the largest when θ is 45 degrees as shown in the graph of FIG.

FIG. 6 is a graph showing the relationship between the velocity components Vz and θ of the resin pieces 2a and 2b when the resin pieces 2a and 2b collide and bounce off. When Vz = V · cos2θ is represented by a graph, it becomes as shown in FIG. 6, and it can be seen that Vz becomes the smallest when θ is 45 degrees as shown in the graph of FIG.

That is, Vy and Vz can be controlled by the inclination angles 12b and 12e of the inclined surfaces 12a and 12f, Vy takes a maximum value at θ = 45 degrees, and Vz monotonically decreases to θ and θ = 45. It can be seen that the degree becomes zero and θ becomes negative in the range of 45 degrees or more and 90 degrees or less.

From this, in order to increase the effect of reducing the flight distance in the x direction of the resin pieces 2a and 2b colliding with the inclined surfaces 12a and 12f of the present embodiment, the inclination angles 12b and 12e are set to 45 with respect to the horizontal direction. It can be seen that it is desirable to configure it in the range of degrees or more and less than 90 degrees.

Forming the inclined portion 12 with one or more inclined surfaces in the longitudinal direction, that is, a plurality of inclined surfaces 12a and 12f on the upper end surfaces of the partition portions 11a and 11b is in the longitudinal direction of the upper end surfaces of the partition portions 11a and 11b. Even if the inclined portion 12 having a large inclination is provided, there is an effect that a height difference does not occur at both ends of the partition portions 11a and 11b.

For example, considering the case where there is only one inclined surface, the height difference between both ends of the partition portions 11a and 11b tends to be large. By forming a triangular wave shape composed of a plurality of inclined surfaces 12a and 12f, there is an effect that the inclined surfaces 12a and 12f can be efficiently arranged.

The tip of the triangular wave-shaped apex angle 12c may be rounded and rounded. Leakage current may be generated when the apex angle 12c is under the electrostatic field which is the sorting space, but the generation of this leak current can be suppressed by rounding the tip of the apex angle 12c. Can be done. As a result, in the resin piece sorting apparatus 1 using the electrostatic sorting method, it is possible to prevent a decrease in the sorting accuracy due to the leak current, and there is an effect that the sorting accuracy of the resin pieces can be further improved.

Further, it is preferable that the upper end surface having the inclined surfaces 12a and 12f is made of stainless steel. For example, when the upper end surface is made of foamed resin or synthetic rubber, there is a possibility that the foamed resin or synthetic rubber on the upper end surface may be scraped and mixed with the resin pieces 2a and 2b collected by the collision of the resin pieces 2a and 2b. be.

In the case of stainless steel, the upper end surface is less likely to be scraped due to the collision of the resin pieces 2a and 2b. In addition, even if the stainless steel pieces scraped by the collision of the sorted resin pieces 2a and 2b are mixed in the recovered resin pieces 2a and 2b, they can be used for the sorting method using an X-ray transmission image, the mesh of the pelletizer during pellet processing, and the like. It is easy to remove it as a foreign substance.

The material of the inclined surfaces 12a and 12f may be made of iron, copper, a copper alloy, an aluminum alloy, or ceramic, in addition to stainless steel. Further, in order to further increase the effect of the present embodiment, the particle size is set to be larger than the particle size of the resin pieces 2a and 2b that select the pitch 12d between the adjacent inclined surfaces 12a and 12f (apical angle 12c). It is preferable to do so.

This is because when the pitch 12d is smaller than the particle size of the resin pieces 2a and 2b (when the resin pieces 2a and 2b having a particle size larger than the pitch 12d collide with the inclined portion 12), before hitting the inclined surfaces 12a and 12f. Since the resin pieces 2a and 2b hit the apex angle 12c, the state is equivalent to that of the flat conventional partition portions 11a and 11b having no inclined portion 12, and the effect of the present embodiment is sufficient. Not demonstrated. For example, if the particle size distribution of the raw material to be input is an average particle size of 10 mm and a maximum particle size of 30 mm, it is preferable to set the pitch 12d to a pitch larger than the maximum particle size of 30 mm.

If the tilt angle 12e is not changed small, the pitch 12d becomes smaller when the tilt angle 12b is increased. When the inclination angle 12b is increased and the pitch 12d is increased, the depth of the inclined surface is increased. That is, the inclined portion 12 of the present embodiment varies by optimizing the inclined portions 12b, 12e and the apex angle 12c of the inclined portion 12 according to the particle size of the resin pieces 2a and 2b to be sorted and the design of the sorting device. It is possible to obtain the effect under the same resin piece sorting device 1 and sorting conditions.

FIG. 7 is a diagram showing a case where the inclination angle 12e of the upper end surfaces of the partition portions 11a and 11b is made larger than 90 degrees. It was mentioned earlier that the tilt angle 12e is the same as the tilt angle 12b, or that it is configured in a triangular wave shape in the range of 45 degrees or more and less than 90 degrees, but as in the example of FIG. 7, the tilt angle 12e is made larger than 90 degrees. The inclined surface 12f may be configured to overhang with respect to the horizontal plane.

In the resin piece sorting apparatus 1 of the present embodiment, the resin pieces 2a and 2b colliding with the upper end surfaces of the partition portions 11a and 11b from above the collecting portions 10a and 10b collide with the inclined surface 12a and have components in the y direction. At this time, the resin pieces 2a and 2b that bounce off on the inclined surface 12a may re-collide with the adjacent inclined surface 12f.

By making the inclination angle 12e larger than 90 degrees, when the resin pieces 2a and 2b that collide with the upper end surfaces of the partition portions 11a and 11b collide with the inclined surface 12a and re-collide with the adjacent inclined surface 12f. The overhanging inclined surface 12f makes it possible to direct the rebounding direction of the resin pieces 2a and 2b at the time of re-collision downward (negative direction in the z direction).

The resin pieces 2a and 2b that re-collide with each other on the inclined surface 12f and bounce off are collected by the recovery units 10a and 10b or the intermediate recovery unit 14 partitioned by the partition portions 11a and 11b. As a result, the resin piece 2a that re-collised with the inclined portion 12 on the upper end surface of the partition portion 11a is less likely to jump into the recovery portion 10b, and the resin piece 2b that re-collised with the inclined portion 12 on the upper end surface of the partition portion 11b. Is less likely to jump into the collection unit 10a.

The inclined portion 12 as shown in FIG. 7 prevents not only misselection by the resin pieces 2a and 2b colliding with the upper ends of the partition portions 11a and 11b but also upward bounce of the resin pieces 2a and 2b due to re-collision, and is more recovered. The purity of the resin pieces 2a and 2b to be formed can be improved.

FIG. 8 is a diagram showing that the upper end surfaces of the partition portions 11a and 11b are inclined portions 12 having arc-shaped inclined surfaces 13a and 13f. In the present embodiment, the inclined portion 12 in which the inclined surfaces 12a and 12f have a triangular wavy shape has been described, but as shown in FIG. 8, the inclined portion 12 may have a shape having a plurality of arc-shaped inclined surfaces 13a and 13f. ..

In this case, as shown in FIG. 8, the inclined portion 12 has a plurality of inclined surfaces 13a and 13f in the longitudinal direction (y direction) of the upper end surfaces of the partition portions 11a and 11b, and the adjacent inclined surfaces 13a and 13f are shown in FIG. As shown in, it is composed of an arc shape. The size of each arc may be the same or different.

As described above, according to the present embodiment, the resin pieces 2a and 2b rebound on the upper end surfaces of the partition portions 11a and 11b due to the inclined portion 12 having an inclination in the longitudinal direction on the upper end surfaces of the partition portions 11a and 11b in the x direction. Since the flight distance of the resin pieces 2a and 11b can be reduced, it is possible to further suppress the occurrence of erroneous sorting of the resin pieces 2a and 2b caused by the resin pieces 2a and 2b that bounce off at the upper end surfaces of the partition portions 11a and 11b.

Further, the mechanism of the present embodiment is to have an inclination angle in the longitudinal direction of the upper end surfaces of the partition portions 11a and 11b, and the resin sorting accuracy can be improved by a simple mechanism. Therefore, according to the mechanism of the present embodiment, it is possible to sort the resin pieces with higher purity and to sort the resin pieces 2a and 2b at a lower cost. Further, according to the mechanism of the present embodiment, it is possible to further improve the purity of the resin pieces 2a and 2b to be recovered without lowering the recovery rate of the resin pieces 2a and 2b.

Although the case where ABS and PS are selected as the resin pieces 2a and 2b has been described, the combination of other resin pieces 2a and 2b may be used, and the combination of resins is not limited. Further, the shape of the upper end portion 12 of the partition portions 11a and 11b may be a shape having an inclination angle in the longitudinal direction of the upper end surface, and is not limited to the shape such as the triangular wave shape described in the present embodiment. ..

Embodiment 2.
In the present embodiment, the number of resin pieces to be sorted is different from that in the first embodiment. The parts different from the first embodiment will be described below.

FIG. 9 is an overall configuration diagram showing an example of a resin piece sorting device 100 that collects three types of resin pieces 2a, 2b, and 2c into three pieces. The portion of the resin piece sorting apparatus 100 shown in FIG. 9 that differs from the first embodiment has three recovery units, 10a, 10b, and 10c, and is intermediate between the two by partition portions 11a, 11b, 11c, and 11d, respectively. It is a part installed across the collection parts 14a and 14b.

The separation unit utilizes the charging and electrostatic fields of the resin pieces 2a, 2b, and 2c as in the first embodiment, but is not limited to this, and is a method capable of separating the resin pieces 2a, 2b, and 2c for each type. If so, other separation methods may be used.

Next, in the selection of the resin pieces, a portion different from that of the first embodiment will be described. Here, the resin pieces 2a, 2b, and 2c refer to ABS, PS, and PP. However, the present invention is not limited to this, and anything that can be separated and sorted may be used.

When a sorting material in which three types of resin pieces of ABS, PS, and PP are mixed is triboelectrically charged, the charging of these resin pieces is positively strongly charged by ABS and negatively strongly charged by PP according to the triboelectric charging column. Shows a tendency to be charged.

On the other hand, PS, which is intermediate between ABS and PP on the charged train, is charged with a charge amount between ABS and PP, although it depends on the mixing ratio of ABS, PS, and PP in the sorting raw material. In the sorting unit, three types of resin pieces are separated into three types by electrostatic separation by utilizing the difference in the amount of charge per weight of each resin piece (this is called specific charge).

The separated resin pieces are collected by the collection units 10a, 10b, and 10c. In the example of FIG. 9, the positively strongly charged resin piece 2a is collected by the recovery unit 10a, the resin piece 2b having a medium specific charge is collected by the middle collection unit 10b, and the negatively strongly charged resin piece 2c is collected. It is collected in each part 10c. The resin pieces 2a and 2b that were not collected by the collection units 10a and 10b are collected by the intermediate collection unit 14a, and the resin pieces 2b and 2c that are not collected by the collection units 10b and 10c are collected by the intermediate collection unit 14b.

The recovery units 10a, 10b, 10c and the intermediate recovery units 14a, 14b have discharge units 16a, 16b, 16d, 16e, 16f at the lower part. Further, in the discharge sections 16e and 16f of the intermediate recovery sections 14a and 14b, circulation such as an air feeding type or a belt type in which the resin pieces 2a, 2b and 2c recovered and leaked by the recovery sections 10a, 10b and 10c are returned to the charging section 3 is circulated. A circulation recovery line 30 equipped with a recovery conveyor device is provided. The resin pieces 2a, 2b, and 2c discharged from the intermediate recovery units 14a and 14b are supplied to the supply unit 4 again.

A part of the separated resin pieces 2a, 2b and 2c falling from the separation part collides with the upper end surfaces of the partition parts 11a, 11b, 11c and 11d and bounces off, and the bounced resin pieces 2a, 2b and 2c , 10a, 10b, 10c and intermediate recovery units 14a, 14b. Each of the partition portions 11a, 11b, 11c, and 11d has the characteristics described in the first embodiment, and has an effect of reducing the flight distance of the resin pieces 2a, 2b, and 2c that collide and bounce off in the x direction.

As a result, even when there are three types of resin pieces, it is possible to prevent a decrease in recovery purity due to the resin pieces rebounding greatly and being mixed in a recovery part other than the proper recovery part. This effect becomes more remarkable when the respective recovery portions 10a, 10b and 10c are located closer to each other. In this embodiment, the parts different from those in the first embodiment have been described. Other parts are the same as those in the first embodiment.

1: Resin piece sorting device, 2a, 2b: Resin piece 3: Charging part, 4: Supply part, 5: Drop part, 6a: High voltage electrode, 6b: Ground electrode, 7: Power supply, 10a, 10b: Recovery part , 14: Intermediate recovery section, 11a, 11b: Partition section, 12a, 12f: Inclined surface, 12b, 12e: Inclined angle

Claims (9)

A drop part that drops multiple types of resin pieces,
A separation part that separates the resin pieces for each type during falling,
A plurality of collection units installed below the separation unit and collecting the separated resin pieces for each type,
An intermediate recovery unit installed between the adjacent collection units to collect the resin pieces,
A partition portion that partitions the recovery portion and the intermediate recovery portion and is provided with a partition plate having an inclination angle in the longitudinal direction of the upper end surface, and a partition portion.
A resin piece sorting device characterized by being provided with. The resin piece sorting apparatus according to claim 1, wherein the intermediate collecting unit collects a plurality of types of the resin pieces leaked by the collecting unit. The resin piece sorting apparatus according to claim 2, wherein the plurality of types are two types. The resin piece sorting apparatus according to claim 2, wherein the plurality of types are three types. One of claims 1 to 4, wherein the partition plate has a plurality of inclined surfaces on the upper end surface, and each of the inclined surfaces has the inclination angle in the longitudinal direction of the upper end surface. The resin piece sorting apparatus according to the section. The resin piece sorting apparatus according to claim 5, wherein the plurality of inclined surfaces have a triangular wave shape. The resin piece sorting apparatus according to any one of claims 1 to 6, wherein the inclination angle is 45 degrees or more and less than 90 degrees with respect to the horizontal direction. The resin piece sorting apparatus according to claim 5 , wherein the plurality of inclined surfaces include an overhanging inclined surface. A drop step that drops multiple types of resin pieces,
A separation step that separates the resin pieces for each type during falling,
The first recovery step of collecting the separated resin pieces for each type by the recovery unit, and
It is provided with a second recovery step of recovering the resin piece leaked in the recovery section by an intermediate recovery section installed between the adjacent recovery sections.
A method for sorting resin pieces, wherein the recovery unit and the intermediate collection unit are partitioned by a partition plate having an inclination angle in the longitudinal direction of the upper end surface.

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