JP6873434B2 - Waste plastic sorting device using circulating water flow - Google Patents

Description

The present invention relates to a technique for recycling waste plastic, and in particular, crushed pieces of waste plastic having a specific density of more than 1 are put into a circulating water stream to have a difference in specific gravity and a difference in the size of the crushed pieces. The present invention relates to a waste plastic sorting apparatus using a circulating water stream that sorts plastics by type and collects each of them.

Waste plastics such as discarded plastic products are collected based on the Container Recycling Law and recycled as materials or raw materials for new products. The collected waste plastic is manually sorted, then crushed and washed into flakes, sorted by type of plastic, etc., and re-commercialized. In order to maintain the quality at the time of recycling, it is necessary to improve the accuracy of sorting, and as a technique for sorting, a method of sorting by utilizing the difference in specific gravity depending on the type of plastic is known.

For example, in Japanese Patent Application Laid-Open No. 2010-142759 "Floth flotation apparatus" of Patent Document 1, an outer casing for accommodating a liquid and an inner cylinder arranged in the outer casing so as to communicate with the outer casing are provided. It has a first blade that is provided in the outer casing and / or in the inner cylinder and can rotate horizontally for stirring the liquid, and a second blade that is provided in the inner cylinder and can move up and down. In a flotation apparatus, a technique has been proposed in which a material containing a wet foam is put into the inner cylinder and suspended in the liquid to sort the foam.

Japanese Unexamined Patent Publication No. 2010-142759

However, the "floth flotation apparatus" described in Patent Document 1 has a problem that it is difficult to move a small specific density resin having a small specific density to a second sorting chamber because the material is charged into the inner cylinder. In addition, the small specific density resin is collected by placing it on the overflowing liquid flow, and the foam is scooped up together with the liquid by a spatula-shaped vertical moving blade and collected. Therefore, the recovered small specific density resin and foam There is a problem that a step of separating the resin from the liquid is required and the work tends to be complicated. Further, when sorting, a step of moistening the material and a step of adjusting the specific gravity of the liquid are required before the material is put into the flotation sorter.

Further, conventionally, when sorting crushed pieces of waste plastic having a specific density of more than 1, a heavy liquid such as salt water other than water is often used. However, since the heavy liquid adheres to the crushed pieces of plastic sorted using the heavy liquid, a work process for cleaning the heavy liquid is required. Therefore, there is a problem that the cost of recycling waste plastic becomes high.

The present invention has been devised to solve such a problem. That is, an object of the present invention is to utilize a water flow that circulates from the bottom to the top to make crushed pieces of waste plastic having a specific density of more than 1 by utilizing the difference in specific densities and the difference in the size of the crushed pieces. It is an object of the present invention to provide a waste plastic sorting apparatus using a circulating water stream that can sort by type and further collect.

The sorting apparatus of the present invention puts crushed pieces of waste plastic into an upward water stream together with water, and sorts waste plastics by type according to the difference in the specific gravity of the crushed pieces and the difference in the size of the crushed pieces. The waste plastic sorting device used
A tubular outer cylinder (1) provided with a substantially inverted conical collecting portion (5) at the bottom, which is provided with a discharge port (6) for discharging crushed pieces of waste plastic that has been sorted and settled. A sorting device main body (4) composed of a tubular inner cylinder (2) arranged inside the outer cylinder (1) so as to have a gap in the same axial direction.
An inner wall (8) and an outer wall (9) are provided on the upper part of the inner cylinder (2) along the circumferential direction of the inner cylinder (2), and crushed pieces of waste plastic are provided on the outer wall (9). A tunnel-shaped circular double wall (10), in which a slit (15) for discharging the resin is opened in the entire circumferential direction at the lower part of the outer wall (9),
A crushed piece attached to the upper part of the circular double wall (10) so as to sandwich the partition wall (12), and a crushed piece of waste plastic is thrown into the circular double wall (10) together with water on one side. An inlet (13), and on the other hand, an inlet (14) for collecting water that has moved in the circular double wall (10).
In the upper part of the circular double wall (10), the partition wall (12) attached between the crushed piece input port (13) and the input water recovery port (14), and the partition wall (12).
A substantially plate-shaped circulating water diffusion plate (3) arranged below the lower bottom surface portion of the inner cylinder (2) and partially provided with a circulating water supply port (17).
Water is supplied to the circulating water supply port (17) of the circulating water diffusion plate (3), and the circulating water is collected from the circulating water recovery port (18) provided in the upper part of the outer cylinder (1). It is characterized by being provided with a water flow circulation device (21).

A crushed piece supply device (31) for supplying crushed pieces of waste plastic together with water to the crushed piece input port (13) and recovering the water used for charging from the input water recovery port (14) may be further provided. it can.
It is preferable to form an inclined wall (16) in the circumferential direction on the inner wall (8) constituting the circular double wall (10).
It is preferable that the circulating water supply port (17) is opened at a position eccentric from the central axis position of the circulating water diffusion plate (3).

The water flow circulation device (21) may be further provided with a crushed piece recovery device (41) for collecting crushed pieces of waste plastic transported together with the circulating water.
The crushed piece collecting device (41) has a charging port (43a) on one side surface of the device body (42) and a circulating water discharge port (44) on the other side surface of the device body (42). ,
A plurality of fixed blades (45) having a substantially U-shape and a rotating blade (46) that slips between the fixed blades (46) are provided in the apparatus main body (42).

In the sorting apparatus of the present invention, crushed pieces of waste plastic are sorted between the outer cylinder body (1) and the inner cylinder body (2) constituting the sorting device main body (4) by using an upward water flow. It can be finely sorted according to the specific gravity of the crushed pieces of each waste plastic. Since this water stream uses circulated water, wasteful use of water can be prevented. Since the crushed pieces are separated together with water, the crushed piece powder (dust) does not scatter during processing unlike a wind power sorter.
Further, when the waste plastic crushed pieces are put into (supplied) to the treatment device, water is used for the transportation, so that the crushed pieces can be prevented from being agglomerated with each other. Since water is circulated and used at this time as well, wasteful use of water can be prevented. Further, since the crushed pieces are transported together with water at the time of charging, the crushed pieces powder (dust) does not scatter as in the case of processing by a belt conveyor.

Since only water is used as the liquid used for sorting waste plastic, the work process for recycling can be simplified. There is no step of cleaning the heavy liquid adhering to the crushed pieces when sorting waste plastic using the conventional heavy liquid, and the work cost is reduced.

In the case where the sloping wall (16) is formed on the circular double wall (10), the crushed pieces of waste plastic are uniformly moved from the slit (15) while moving in a circumferential shape by the sloping wall (16). Since it is discharged in the circumferential direction, it can be uniformly diffused in the upward water flow between the outer cylinder (1) and the inner cylinder (2).

Since the water flow for sorting the crushed pieces is supplied from the circulating water supply port (17) opened at a position eccentric from the direction facing the circulating water recovery port (18) from the center of the circulating water diffusion plate (3). An even updraft is formed. Since water is not discharged from the slit (15), the water flow into which the crushed pieces are thrown does not interfere with the upward water flow. This upward water flow is formed between the outer cylinder body (1) and the inner cylinder body (2), and smooth sorting processing becomes possible.

In the sorting method using the sorting device of the present invention, crushed pieces of waste plastic are sorted by using an ascending water stream. Similar to the conventional selection using heavy liquids having different specific densities, it can be dealt with by relatively varying the flow velocity of the rising water flow.

Furthermore, when the crushed pieces of waste plastic are charged, they are charged together with water. Circulated water is also used for this water flow. At this time, the particles of the crushed pieces are released from the slit (15) due to their own weight, but the water used for transportation is not released from the slit (15).

It is a front sectional view which shows the main body of the sorting apparatus which comprises the waste plastic sorting apparatus using the circulating water flow of this invention. It is a plan sectional view of the sorting apparatus main body. It is a side sectional view of the sorting device main body, and is a state in which the sorting device main body shown in FIG. 1 is rotated in the direction of 90 degrees around an axis. It is an enlarged view of a circular double wall. It is explanatory perspective view which shows the water flow of a crushed piece and water in a circular double wall. It is a plan sectional view of the sorting apparatus main body which shows the circulating water diffusion plate. It is a right sectional view of the sorting apparatus main body which shows the circulating water diffusion plate. It is a schematic front view which shows an example of the plant which comprises the sorting apparatus main body which comprises the waste plastic sorting apparatus of this invention, a water flow circulation apparatus, and a crushed piece supply apparatus. It is the schematic explanatory drawing of the state of sorting by the specific gravity difference of the crushed piece using the waste plastic sorting apparatus. It is the schematic explanatory drawing of the state of sorting by the difference in the size of the crushed piece using the waste plastic sorting apparatus. It is a side sectional view which shows the layer type crushed piece recovery device which is a modification of the crushed piece recovery device. It is a top view which shows the fixed vane and the rotary vane of a layered debris collection device.

In the waste plastic sorting apparatus using the circulating water flow of the present invention, crushed pieces of waste plastic are put into the rising water flow together with water from above, and due to the difference in the specific gravity of the crushed pieces and the difference in the size of the crushed pieces, It is a device that sorts plastics, etc. by type and collects each.

<Structure of sorting device body>
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front sectional view showing a main body of a sorting device constituting the waste plastic sorting device using the circulating water flow of the present invention.
The waste plastic sorting device using the circulating water flow of the present invention is a processing device provided with a sorting device main body 4 composed of an outer cylinder 1, an inner cylinder 2, and a circulating water diffusion plate 3, and a water flow circulation device 21. .. The sorting device of the present invention is a device in which crushed pieces of waste plastic are put into an upward water stream together with water from above, and the waste plastic is sorted by type according to the difference in the specific densities of the crushed pieces, and each is collected. Furthermore, even when there is a difference in the size of the crushed pieces, it is possible to sort the waste plastics by type by using an upward water flow.

The outer cylinder 1 constituting the sorting device main body 4 is a device having a substantially cylindrical shape. A collection portion 5 having a substantially inverted conical shape is provided at the lower portion of the outer cylinder 1. The recovery unit 5 is a portion for collecting crushed pieces of waste plastic that has been sorted and settled. The collection unit 5 is provided with a discharge port 6 for discharging crushed pieces of sedimented waste plastic.

Inside the outer cylinder 1, the cylindrical inner cylinder 2 is arranged so that a gap is provided and the axial directions of the cylinders 2 are the same. Water circulates in the gap between the inner cylinder 2 and the outer cylinder 1. As shown in FIG. 1, water flows upward between the circumferential surface of the outer cylinder 1 and the circumferential surface of the inner cylinder 2. Therefore, it is desirable that a space in which a rising water flow flows is formed between the outer cylinder 1 and the inner cylinder 2. However, the outer cylinder 1 and the inner cylinder 2 are not limited to an accurate cylindrical shape as shown in the illustrated example. For example, it may be a polygonal tubular body.

As the inner cylinder 2, a device having a hollow inside was used in this embodiment. Therefore, as shown in the figure, the inner cylinder 2 is fixed to the outer cylinder 1 by using the rod-shaped body 7 that faces downward from the upper part of the outer cylinder 1. The rod-shaped body 7 is attached so as to penetrate the inner cylinder body 2 in the direction of the central axis. The fixing means of the inner cylinder 2 is not limited to the rod-shaped body 7. However, it is desirable that the structure does not interfere with the water flow of water flowing upward between the outer cylinder 1 and the inner cylinder 2, and does not interfere with the operation of the rising crushed pieces and the settling crushed pieces.

<Composition of circular double wall>
FIG. 2 is a plan sectional view of the main body of the sorting device. FIG. 3 is a side sectional view of the main body of the sorting device, and is a state in which the main body of the sorting device shown in FIG. 1 is rotated 90 degrees around an axis. FIG. 4 is an enlarged view of a circular double wall. FIG. 5 is an explanatory perspective view showing a water flow between a crushed piece and water in a circular double wall.
A substantially tunnel-shaped circular double wall 10 composed of an inner wall 8 and an outer wall 9 is provided above the inner cylinder 2. The circular double wall 10 is a portion where crushed pieces of waste plastic to be separated are thrown in together with water from above. The circular double wall 10 is literally provided along the shape of the upper bottom surface portion of the inner cylinder 2.
Further, a cover 11 having a substantially conical shape is provided on the upper surface of the circular double wall 10, and the cover 11 is a member for smoothly flowing the selected crushed pieces of waste plastic having a small specific gravity and circulating water. ..

A part of the circular double wall 10 has a partition wall 12 as shown in FIGS. 4 and 5. In the upper part of the circular double wall 10, a crushed piece input port 13 and an input water recovery port 14 are attached so as to sandwich the partition wall 12. The crushed piece input port 13 is a portion for inserting crushed pieces of waste plastic into the circular double wall 10. The input water recovery port 14 is a portion for recovering water using the circular double wall 10 for transporting crushed pieces of waste plastic. Following the partition wall 12, a guide plate 12a for smoothly guiding the crushed pieces from the crushed piece input port 13 into the circular double wall 10 is attached.

The crushed piece input port 13 and the input water recovery port 14 are connected to a crushed piece supply device 31, which will be described later. The crushed piece supply device 31 is a device that supplies crushed pieces of waste plastic together with water to the crushed piece input port 13 and recovers the water used for transportation from the input water recovery port 14.

As shown in FIGS. 4 and 5, slits 15 are opened in the circumferential direction at the lower portion of the outer wall 9 of the circular double wall 10. The slit 15 is a portion for discharging crushed pieces of waste plastic into the space between the inner cylinder 2 and the outer cylinder 1. At this time, the crushed pieces are discharged from the slit 15 due to their own weight, but the water used for transportation is not discharged from the slit 15 and is recovered as it is. The lump larger than the clearance (C) of the slit 15 is not discharged into the space between the inner cylinder 2 and the outer cylinder 1. Alternatively, when the crushed pieces thrown in from the crushed piece input port 13 are in a mass, they are unraveled (unraveled) at the slit 15 portion. The circular double wall 10 is not limited to the 360-degree form as shown, as long as the crushed pieces can be widely dispersed in the rising water flow from the slit 15 portion of the circular double wall 10.

Further, the clearance (C) of the slit 15 of the circular double wall 10 can be freely changed according to the type of waste plastic to be treated and the size of crushed pieces. When processing large debris, set the clearance (C) accordingly. On the contrary, when processing a small object such as a pulverized product, the clearance (C) is set to be smaller than this.

An inclined wall 16 can be formed in the circumferential direction on the inner wall 8 of the circular double wall 10. The crushed pieces of waste plastic thrown into the circular double wall 10 having such a sloping wall 16 move in this circumferential shape by the sloping wall 16 and uniformly enter the upward water flow from the slit 15. It is diffused.

Further, if necessary, the shape of the inclined wall 16 is not limited to a simple inclined surface, and various shapes such as a curved shape, a wavy shape in the circumferential direction, and various shapes can be used.

The distance (d) between the outer wall 9 and the inner wall 8 of the circular double wall 10 does not need to be set to the same distance in the circumferential direction as in the illustrated example (see FIG. 4). The interval is wide near the crushed piece input port 13, and the interval can be narrowed as it approaches the input water recovery port 14. This is because the input water containing a large amount of crushed pieces is gradually diffused from the slit 15, and the remaining crushed pieces are easily pushed out from the slit 15 and diffused near the input water recovery port 14.

<Structure of circulating water diffuser>
FIG. 6 is a plan sectional view of the main body of the sorting device showing the circulating water diffusion plate. FIG. 7 is a normal cross-sectional view of the separation device main body showing the circulating water diffusion plate.
The circulating water diffusion plate 3 is arranged below the lower bottom surface portion of the inner cylinder body 2. The circulating water supply port 17 is opened in a part of the circulating water diffusion plate 3. Water is supplied to the circulating water supply port 17 from the water flow circulation device 21 described later. This water forms an upward stream of water, and crushed pieces of waste plastic are sorted mainly by specific gravity.

The circulating water diffusion plate 3 is a substantially disk-shaped member having substantially the same outer diameter as the outer diameter of the inner cylinder 2 described above. Alternatively, a substantially disk-shaped member having an outer diameter slightly larger than the outer diameter of the inner cylinder 2 may be used. The reason why the outer diameter is set to such an outer diameter is that it does not interfere with the descent of the settled crushed pieces to the collecting portion 5. An upward water flow is generated from the outer circumference of the circulating water diffusion plate 3 in the space with the inner surface of the outer cylinder 1, and crushed pieces that settle from the outer circumference of the circulating water diffusion plate 3 are collected from the discharge port 6 of the collection unit 5. The shape of the circulating water diffusion plate 3 is not limited to the disc shape as long as it can collect up to. It can be variously changed to an elliptical shape or a polygonal shape according to the shape of the inner cylinder 2.

As shown in FIG. 7, in the space between the inner cylinder 2 and the inner surface of the outer cylinder 1, the crushed pieces having a large specific density settle against the upward water flow. The crushed piece having a large specific density passes through the peripheral edge of the circulating water diffusion plate 3 and reaches the recovery portion 5 having a substantially inverted conical shape. After that, the settled crushed pieces are discharged from the discharge port 6.

<Plant configuration of waste plastic sorting equipment>
FIG. 8 is a schematic front view showing an example of a plant including a sorting device main body, a water flow circulation device, and a crushed fragment supply device constituting the waste plastic sorting device of the present invention.
An example of the plant of the waste plastic sorting apparatus of the present invention is shown in FIG. The waste plastic sorting device of the present invention is composed of a water flow circulation device 21 and a crushed fragment supply device 31 centering on the above-mentioned sorting device main body 4.

The water flow circulation device 21 supplies water to the circulating water supply port 17 of the sorting device main body 4, and uses the water used for transportation together with the crushed pieces of waste plastic floating from the upper part of the outer cylinder 1 as the sorting device main body 4. This is a device that collects water from the circulating water recovery port 18 and circulates the water in the sorting device main body 4. The water flow circulation device 21 includes a pump 22 and a pipeline 23.

The plant is composed of an apparatus for collecting crushed fragments of particles having a large specific density and an apparatus for collecting crushed fragments of particles having a small specific density, respectively. The crushed pieces of particles having a large specific density are carried upward from the discharge port 6 of the collection unit 5 of the sorting device main body 4 by using the screw conveyor 32, and are collected from there in a predetermined collection bag (not shown).
Further, the crushed pieces of the particles having a small specific density are transported or suspended by the circulating water from the upper part of the outer cylinder 1 by using the crushed piece collecting device 41 as described later provided in the water flow circulation device 21. Collect the crushed pieces of waste plastic together with water. Also at this time, collect in a predetermined collection bag (not shown).

<Operation explanation 1 of waste plastic sorting / separating / collecting device>
FIG. 9 is a schematic explanatory view of a state in which a waste plastic sorting device is used to sort crushed pieces according to the difference in specific gravity.
In the sorting method using the waste plastic sorting device of the present invention, first, water is supplied from below by using the water flow circulation device 21 between the outer cylinder 1 and the inner cylinder 2 of the sorting device main body 4, and the water is directed upward. Generate a stream of water. This upward stream is a circulating stream.
The crushed pieces of waste plastic with different specific densities are mixed with the crushed pieces of waste plastic from above in this upward water flow. The crushed pieces are a mixture of crushed pieces (particles) having a low specific density (indicated by white circles in the figure) and crushed pieces (particles) having a large specific density (indicated by black circles in the figure). This is thrown into the upward water flow from the slit 15 of the circular double wall 10 of the sorting device main body 4. The crushed pieces (particles) having a small specific density ride on the flow of the water stream, and the floating crushed pieces are collected together with the rising water above the outer cylinder 1.
On the other hand, the crushed fragments (particles) having a large specific gravity that settle against the rising water flow are collected by the collection unit 5 at the lower part of the outer cylinder 1. In this way, plastics are sorted by type according to the difference in the specific densities of the crushed pieces.

<Variable flow velocity of rising water>
In the fractional sorting method using the waste plastic sorting device of the present invention, for example, the flow velocity of the rising water flow generates an rising flow velocity at a flow velocity of 5 cm / s. The crushed pieces of waste plastic are put into such a slow rising water flow, and the crushed pieces that settle against the rising water flow of this flow velocity are collected by the recovery unit 5 as crushed pieces having a large specific density. On the contrary, the crushed pieces or floating crushed pieces transported together with the rising water flow of this flow velocity are collected as crushed pieces having a small specific density.

For example, the reference flow velocity is 5 cm / s of the rising water flow. As shown in Table 1, when the separation boundary (classification point) of the mixed crushed pieces is small, for example, when the classification point is close to 1 such as 1.02, 1.03 or 1.04, it is from 5 cm / s. It is preferable to circulate water at a slow flow rate (2 cm / s to less than 5 cm / s). On the contrary, when the classification point is large, for example, when the classification point is 1.06 or 1.08, water having a flow velocity faster than 5 cm / s (5 cm / s to 7 cm / s) can be circulated. It should be noted that the classification points in Table 1 are examples, and it goes without saying that they are not limited to these numerical values.
However, when multiple types of waste plastics are mixed, it is desirable to sort them at a standard flow rate.

<Operation explanation 2 of waste plastic sorting device>
FIG. 10 is a schematic explanatory view of a state in which a waste plastic sorting device is used to sort crushed pieces according to their sizes.
The sorting method using the waste plastic sorting device of the present invention is not a technique for sorting into sedimented crushed pieces and floating crushed pieces by simply using the difference in specific gravity as in a storage water tank. In an upward water flow, it is a method of sorting into crushed pieces that settle against this water flow, crushed pieces that flow in the water flow, and floating crushed pieces. Therefore, the difference is not simply limited to the difference in specific densities, and as shown in FIG. 10, the size of the crushed pieces, particularly the crushed pieces in the form of a film, may increase even if the specific gravity is large.

For example, as shown in Table 2, when the size of the mixed crushed pieces is medium and the size is 5 mm, the reference flow velocity is 5 cm / s. When the mixed crushed pieces are small and the size is 2 to 4 mm, it is preferable to circulate water at a flow velocity slower than 5 cm / s (2 cm / s to less than 5 cm / s). On the contrary, when the mixed crushed pieces are large and the size is 6 to 8 mm, water having a flow velocity faster than 5 cm / s (5 cm / s to 7 cm / s) can be circulated. It should be noted that the numerical values of the sizes of the mixed crushed pieces in Table 2 are also examples, and it goes without saying that they are not limited to these numerical values.

<Putting positions of circulating water and crushed pieces are relative to each other>
As shown in the plan view of FIG. 2 and the side sectional view of FIG. 3, the circulating water supply port 17 is preferably opened at a position eccentric from the center of the circulating water diffusion plate 3. The water flow for sorting the crushed pieces is supplied from the circulating water supply port 17 opened at a position facing the circulating water recovery port 18, so that the water flow is evenly distributed between the outer cylinder 1 and the inner cylinder 2. An updraft occurs in. Therefore, smooth sorting of crushed waste plastic pieces becomes possible.

In the present invention, in the upward water flow, crushed pieces having a small specific gravity or large crushed pieces that are susceptible to the resistance of the water flow are transported upward together with the upward water flow relatively as compared with the small crushed pieces. It is designed to sort out mixed waste plastic shards. Therefore, in order to gradually sort out from the state where the low and high specific densities are mixed, it is necessary to have some time to float in water and a certain distance to move. This is because it takes a certain amount of time for the water (circulating water) supplied from the circulating water supply port 17 to be collected in the circulating water recovery port 18.

<Modified example of crushed fragment recovery device (layered crushed fragment recovery device)>
FIG. 11 is a side sectional view showing a layered crushed piece collecting device which is a modification of the crushed piece collecting device. FIG. 12 is a plan view showing the fixed blades and the rotating blades of the layered fragment collecting device.
The layered crushed piece collecting device 41, which is a modification of the crushed piece collecting device, has a charging port 43a on one side surface of the device body 42 and a circulating water discharge port 44 on the other side surface of the device body 42. Further, a plurality of fixed blades 45 having a crushed piece discharge port 43b on another surface and having a substantially U-shape and a rotary blade 46 that slips between the fixed blades 45 are provided in the apparatus main body 42. It is a device for collecting the provided crushed pieces. The crushed pieces thrown in from the charging port 43a are captured by a plurality of fixed blades 45 having a substantially U-shape and the tip portions of the rotating blades 46, and are transported to the crushed piece discharging port 43b as they are.
In particular, since the fixed blades 45 and the rotating blades 46 are arranged in layers, it is possible to capture cotton-like crushed pieces, which was difficult in the past. The recovery efficiency is higher than that of a simple net-like recovery device.

In the present invention, crushed pieces of waste plastic, etc. are sorted by type of plastic, etc. by utilizing the difference in specific gravity or the difference in size of the crushed pieces by utilizing the water flow circulating from the bottom to the top, and further recovered. Of course, the configuration is not limited to the above-described embodiment of the invention, and various changes can be made without departing from the gist of the present invention.

The waste plastic sorting device using the circulating water flow of the present invention is not limited to household waste plastic, waste automobiles, waste home appliances, and waste office furniture, and can be used for recycling other industrial equipment.

1 Outer cylinder 2 Inner cylinder 3 Circulating water diffuser 4 Sorting device main body 5 Recovery part 6 Discharge port 8 Inner wall 9 Outer wall 10 Circular double wall 12 Partition wall 13 Crushed piece input port 14 Input water collection port 15 Slit 16 Inclined wall 17 Circulating water supply port 18 Circulating water recovery port 21 Water flow circulation device 31 Crushed piece supply device 41 Crushed piece recovery device 42 Device main body 43a Input port 43b Crushed piece discharge port 44 Circulating water discharge port 45 Fixed blade 46 Rotating blade

Claims (6)

A waste plastic sorting device that uses a circulating water stream to put crushed waste plastic pieces into an upward water stream together with water and sort the waste plastics by type according to the difference in the specific gravity of the crushed pieces and the difference in the size of the crushed pieces. There,
A tubular outer cylinder (1) provided with a substantially inverted conical collecting portion (5) at the bottom, which is provided with a discharge port (6) for discharging crushed pieces of waste plastic that has been sorted and settled. A sorting device main body (4) composed of a tubular inner cylinder (2) arranged inside the outer cylinder (1) so as to have a gap in the same axial direction.
An inner wall (8) and an outer wall (9) are provided on the upper part of the inner cylinder (2) along the circumferential direction of the inner cylinder (2), and crushed pieces of waste plastic are provided on the outer wall (9). A tunnel-shaped circular double wall (10), in which a slit (15) for discharging the resin is opened in the entire circumferential direction at the lower part of the outer wall (9),
A crushed piece attached to the upper part of the circular double wall (10) so as to sandwich the partition wall (12), and a crushed piece of waste plastic is thrown into the circular double wall (10) together with water on one side. An inlet (13), and on the other hand, an inlet (14) for collecting water that has moved in the circular double wall (10).
In the upper part of the circular double wall (10), the partition wall (12) attached between the crushed piece input port (13) and the input water recovery port (14), and the partition wall (12).
A substantially plate-shaped circulating water diffusion plate (3) arranged below the lower bottom surface portion of the inner cylinder (2) and partially provided with a circulating water supply port (17).
Water is supplied to the circulating water supply port (17) of the circulating water diffusion plate (3), and the circulating water is collected from the circulating water recovery port (18) provided in the upper part of the outer cylinder (1). A waste plastic sorting device using a circulating water flow, which comprises a water flow circulation device (21). A crushed piece supply device (31) for supplying crushed pieces of waste plastic together with water to the crushed piece input port (13) and recovering the water used for charging from the input water recovery port (14) is further provided. The waste plastic sorting apparatus using the circulating water flow according to claim 1. The waste using the circulating water flow according to claim 1 or 2, wherein the inclined wall (16) is formed in the circumferential direction on the inner wall (8) constituting the circular double wall (10). Plastic sorting device. The invention according to any one of claims 1, 2 or 3, wherein the circulating water supply port (17) is opened at a position eccentric from the central axis position of the circulating water diffusion plate (3). Waste plastic sorting device using circulating water flow. Claims 1, 2, and 3 are characterized in that the water flow circulation device (21) is further provided with a crushed piece recovery device (41) for collecting crushed pieces of waste plastic transported together with the circulating water. Or, a waste plastic sorting device using the circulating water flow according to any one of 4. The crushed piece collecting device (41) has a charging port (43a) on one side surface of the device body (42) and a circulating water discharge port (44) on the other side surface of the device body (42). ,
A feature of the apparatus main body (42) is that a plurality of fixed blades (45) having a substantially U-shape and rotating blades (46) that slip between the fixed blades (46) are provided. The waste plastic sorting apparatus using the circulating water flow according to claim 5.

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