JP3271043B2 - Mixture sorting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixture sorting apparatus,
In particular, the present invention relates to a mixture sorting apparatus that sorts objects to be sorted according to specific gravity when objects to be sorted having different specific gravities are mixed.

[0002]

2. Description of the Related Art Among general wastes and industrial wastes discharged in large quantities, the amount of plastic wastes is steadily increasing, and at present it is difficult to take measures for their disposal. In the treatment of waste plastics, incineration of the waste plastics generates toxic gases and causes pollution problems, and disposal of these wastes in landfills causes instability such as land subsidence after landfill due to the large volume ratio. And require vast land.

[0003] In particular, regarding the treatment of industrial wastes, which have been increasing in size, unless waste plastics are separated and removed, high-temperature combustion is required at the time of incineration, and durability of the incinerator becomes a problem. Further, in the case of landfill disposal, there are also problems such as a rise in disposal costs such as landfill disposal costs and transportation costs.

[0004] Therefore, as a method of separating such waste plastic without landfill disposal, an electrostatic separation method described in JP-A-52-86452 and a method of separating the waste plastic disclosed in JP-A-50-142681 are disclosed. And the like.

[0005] In the above prior art, the electrostatic separation method involves passing an aggregate of plastic films made of various materials between electrode plates to which a high DC voltage is applied within a time period in which static electricity generated in the plastic film does not disappear. Then, depending on the sign of static electricity (positive or negative) or the amount of charge,
The plastic film is sorted by type by utilizing the fact that the film is sucked and repelled by the positive electrode plate or the negative electrode plate. That is, it is a method in which waste plastic is passed through a high-voltage electric field and separated by utilizing a difference between an attractive force and a repulsive force due to electrostatic induction.

However, the electrostatic separation method has a problem that the separation efficiency varies depending on the size (mass) of the waste plastic crushed pieces, and also requires a high-voltage generation facility, a raw material drying facility, a fine grinding facility, and the like. However, there is a disadvantage that the equipment cost is increased.

In the liquid cyclone method, liquid and waste plastic crushed pieces are fed tangentially to the container wall from the top of the separation container, and a downward swirling flow of the liquid flows along the container wall and an upward swirling flow flows toward the center. The crushed plastic pieces with a large difference in specific gravity from the liquid are settled down on the downward swirling flow and discharged from the lower part of the container, and those with a small difference in specific gravity from the liquid are sucked into the upward swirling flow and raised. The waste plastic is sorted by overflowing from the upper part of the container. That is, the method of separating the waste plastic crushed pieces by the difference in specific gravity using the swirling flow of the liquid does not have the disadvantage that the equipment cost is high as in the electrostatic separation method.

Japanese Patent Application Laid-Open No. 56-56246 and Japanese Patent Application No. 4-338360 filed by the same applicant as the present application disclose,
When plastics are sorted using the specific gravity difference with the liquid, the floating plastic is further separated into two types,
There has been proposed a method of further separating sedimented plastic into two types.

[0009]

However, in the above-mentioned prior art liquid cyclone method, the power consumption of the liquid circulation pump for feeding the liquid medium and the waste plastic crushed pieces to the separation container is increased, and the waste plastic crushed pieces are reduced. There is a problem that the efficiency of separation differs depending on the size (mass) of the particles.

Further, in the above prior art, any of
There is a problem in that it is not possible to improve the sorting ability. As mentioned above, the amount of waste plastics is steadily increasing, and it is very important to increase the sorting capacity in accordance with the increase, and there is a strong demand to increase the sorting capacity. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mixture sorting apparatus which has a high sorting efficiency when sorting a mixture of waste plastic crushed pieces and the like, consumes less power of the apparatus, and is extremely easy to increase the sorting ability. It is in.

[0012]

To achieve the above object, the present invention provides a liquid medium tank in which a liquid medium is stored, and a circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank. And an input means for inputting an object to be sorted, in which objects having different specific gravities are mixed, into the liquid medium tank from the upstream side of the circulating flow; provided in the liquid medium tank; A sorting unit that sorts the sorted objects flowing on the surface by using a specific gravity difference with a liquid medium, and an unloading unit that unloads the sorted objects selected by the sorting unit to the outside. In the mixture sorting apparatus, a plurality of divided small channels are provided in the liquid medium tank, and the circulating flow generating unit, the input unit, and the selecting unit are installed in each of the small channels, and the unloading unit is connected to each of the small channels. One that is shared by all waterways A.

Further, the present invention provides a liquid medium tank in which a liquid medium is stored, a circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and a sorting method in which objects having different specific gravities are mixed. A charging means for charging the material into the liquid medium tank from the upstream side of the circulating flow, and a stirring device for stirring the charged material in the liquid medium to remove bubbles attached to the material to be sorted. Foaming means, provided in the liquid medium tank, the object to be separated that has been defoamed by the defoaming means and has flown in a circulating flow, the object to be sorted having a specific gravity smaller than that of the liquid medium floats, and a specific gravity of A large sorting object is separated by sedimentation, and a sorting means for further separating the settling sorting object by specific gravity using a circulating flow, and an unloading means for carrying out the sorting object sorted by the sorting means to the outside. In the mixture sorting device comprising: A plurality of divided small waterways are provided, and the circulating flow generating means, the charging means, the defoaming means and the sorting means are installed for each of the small waterways, and the carrying-out means is shared by all of the small waterways. It was done.

Further, in the mixture sorting apparatus having the above-mentioned structure, it is possible to add a circulating flow velocity adjusting means for adjusting the circulating flow velocity for each of the small channels. The input means is configured to classify the objects to be sorted by size, and then to input into each of the small channels by size, and the sorting means generates a vortex in a part of the circulating flow in the liquid medium tank. By doing so, the sedimented sorting object is further sorted by specific gravity. Further, the above-mentioned mixture sorting apparatus can be installed in a waste treatment apparatus for sorting metals and plastics.

[0015]

The operation of the mixture sorting apparatus having the above-mentioned structure will be described by taking as an example the case where the object to be sorted is plastic waste.
The specific gravity of major plastic waste discharged in large quantities is 0.90 to 0.98 for polyethylene, 0.90 to 0.96 for polypropylene, and 1.02 to 1.1 for polystyrene.
5. 1.03 to 1.09 for ABS resin, 1.25 to 1.30 for phenol resin, 1.33 to 1.45 for polyvinyl chloride
Since these specific gravities are close to the specific gravity of water, water is used as a liquid medium for specific gravity selection.

According to the mixture sorting apparatus having the above structure, the plastic waste introduced into the divided small waterways from the charging means is transported in a circulating flow for each of the small waterways to the place where the sorting means is provided. Can be At the place where the sorting means is provided, polyethylene and polypropylene having a specific gravity lower than water float on the water surface, and polystyrene and A having a specific gravity higher than water
The BS resin, phenolic resin, and polyvinyl chloride are settled at the bottom of the liquid medium tank, so that the plastic can be sorted according to the specific gravity of each small channel. Then, the plastics sorted for each of the small waterways are carried out to the outside by common carrying-out means according to specific gravity.

When the defoaming means is provided, air bubbles adhering to the surface of the plastic waste introduced from the introducing means can be removed. That is, when plastic waste is put into water, bubbles adhere to the surface of the plastic waste and the apparent specific gravity of the plastic becomes small, so that sorting becomes inaccurate.However, defoaming means is provided for each small channel. If this is the case, it is possible to easily remove bubbles attached to the surface of the plastic waste and then send the plastic waste to a place where the sorting means is provided.

Further, if the sorting means is provided with a function of further separating the sedimented sediment according to the specific gravity using the circulating flow, the sedimented sediment can be more finely selected. Among the plastics sinking at the bottom of the liquid medium tank, polystyrene,
ABS resin has a lower specific gravity than phenol resin and polyvinyl chloride, and has a lower sedimentation speed than phenol resin and polyvinyl chloride. Therefore, ABS resin is often carried downstream by circulating flow. Therefore, if a plurality of containers are provided at the bottom of the liquid medium tank provided with the sorting means, for example, along the flow direction of the circulating flow, polyvinyl chloride and phenol resin having a large specific gravity are provided in the upstream container. A large amount of polystyrene and ABS resin enter the downstream box.
In this case, if the sorting means is provided with a function of generating a vortex in a part of the circulating flow in the liquid medium tank, the sorting into the upstream and downstream receiving containers can be accurately performed. That is,
Polystyrene with low specific gravity, ABS
The resin rises higher than the polyvinyl chloride or phenol resin and flows along the circulating flow into the downstream receiving container, so that polystyrene and ABS resin can be prevented from entering the upstream receiving container.

Further, if the input means is provided with a function of classifying the objects to be sorted by size and further provided with a circulating flow velocity adjusting means for adjusting the circulating flow velocity for each small channel, the accuracy of the sorting can be further improved. It can be further improved. If the size of the plastic waste is various, the input means classifies the plastic waste by size, and separates the waste into small channels according to the size to be injected. On the small waterway side, the flow velocity of the small waterway into which large plastic waste is injected is high, and the flow velocity of the small waterway into which small plastic waste is injected is low. Set the flow velocity. In this way, the accuracy of the sorting becomes better,
Good sorting is possible over a wide range of plastic waste sizes.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention and show an example in which the present invention is applied to sorting of plastic. FIG. 1 shows a plan view of the plastic sorting apparatus. In FIG. 1, reference numerals 1a, 1b, 1c, and 1d denote small water channels partitioned by water channel dividing plates 2a, 2b, and 2c, and a liquid medium for sorting plastic in the small water channels 1a, 1b, 1c, and 1d. Is inserted. This liquid medium is circulated. That is, the liquid medium in the small water channels 1a, 1b, 1c, 1d is sucked by the circulation device 3 and supplied to the small water channels 1a, 1b, 1c, 1d from the water supply ports 4a, 4b, 4c, 4d. Here, since the small waterways 1a, 1b, 1c, 1d have the same configuration, the small waterway 1a will be described below.

FIG. 2 is a longitudinal sectional view of the small water channel 1a. In FIG. 2, a hopper 5 is installed above the small water channel 1a. From the hopper 5, objects to be sorted, which are made of a mixture of plastics having different specific gravities, are introduced into the small channel 1a. In addition, the small water channel 1a is provided with a stirring device 6a, which can remove bubbles attached to the surface of the crushed material input from the hopper 5. The small channel 1a provided with the stirrer 6a is an underwater channel 7 formed by an upper guide 8 and a lower guide 9 (both guide surfaces are inclined so as to lower the channel toward the downstream side). I have.

A sorting section 10 is formed downstream of the underwater channel 7. The sorting unit 10 includes a sediment first unloading device 11 for taking out the sorted objects to be sorted out,
A second sediment unloading device 12 and a floating unloading device 13 are provided. Receiving boxes 15, 16 are formed at the bottom of the sorting section 10 by partitions 14.
The carrying-out devices 11 and 12 are installed in the insides 5 and 16. That is, the unloading devices 11 and 12 are provided with the channel dividing plates 2a and 2b,
2c through a gap formed near the bottom of small waterway 1
a, 1b, 1c, 1d are installed substantially perpendicularly.

On the downstream side of the sorting section 10, a drain section 17 connected to the circulation device 3 is provided. The drain unit 17 includes a strainer 18, a resistance plate 19, and a drain duct 20. In addition, an injection port 21 is provided at the bottom of the sorting unit 10.
The flow rate of the liquid medium from the circulation device 3 is adjusted by the valve 22, and the liquid medium is jetted toward the bottom of the receiving box 15.

The circulating device 3 is a circulating flow generating means, the hopper 5 is a charging means, the agitating devices 6a to 6d are defoaming means, the sorting unit 10 is a sorting device, and the unloading devices 11, 12, and 1.
Reference numeral 3 denotes a carrying-out means.

In the above configuration, the objects to be sorted, which are made of mixed plastics having different specific gravities and are put into the small channel 1a from the hopper 5, are pushed into the small channel 1a by the liquid medium injected from the water supply port 4a. At this time, air bubbles often adhere to the surface of the plastics, and since the air bubbles greatly affect the selection efficiency of the specific gravity selection, it is necessary to remove the air bubbles. For this reason, in this embodiment, the stirrer 6a is provided, and the stirrer of the stirrer 6a is used to remove bubbles attached to the plastic surface. The sorted object from which the air bubbles adhered to the surface has been removed in this way touches the air so that the air bubbles do not adhere again, so that the air flows through the underwater channel 7 formed by the upper guide 8 and the lower guide 9 as shown by an arrow A. It is transported and reaches the sorting unit 10.

In the sorting section 10, the selected object having a lower specific gravity than the liquid medium such as polyethylene or polypropylene floats and gathers on the liquid medium water surface 23. On the other hand, polystyrene, A
Objects to be sorted having a higher specific gravity than the liquid medium such as BS resin, phenol resin, polyvinyl chloride, etc., settle out and receive
6, among the sedimented sedimented substances, those having a low specific gravity, such as polystyrene and ABS resin, mainly enter the receiving box 16 on the circulating flow, and those having a large specific gravity, such as phenolic resin and polyvinyl chloride, settle. Is fast and mainly enters the receiving box 15. However, it is not perfect if only the circulating flow is selected, and the receiving box 15 contains a part of polystyrene or ABS resin having a relatively small specific gravity.

Therefore, in the present embodiment, the injection port 21 is provided in order to prevent an object having a relatively small specific gravity from entering the receiving box 15. That is, by injecting the liquid medium from the injection port 21 toward the bottom of the receiving box 15 as shown by the arrow B, the inside of the receiving box 15 is substantially perpendicular to the flow in the direction of the arrow A in the underwater channel 7. A vortex C is generated, and due to the upward flow of the vortex C, polystyrene having a small specific gravity, AB
The S resin rises high and gets on the circulation again
It flows to. On the other hand, polyvinyl chloride and phenol resin having a large specific gravity are returned into the receiving box 15 by the downward flow of the vortex C. By this action, the sorting between the settling plastics is performed more effectively.

By this operation, the objects to be settled down in the sorting section 10 can be further sorted by the difference in specific gravity. The vinyl chloride-based plastics thus sorted out are taken out by the first sediment discharger 11, the styrene-based plastics are taken out by the second sediment discharger 12, and the floating plastic is taken out by the floater discharger 13.

On the other hand, the liquid medium passes through the sorting section 10 and is sucked into the circulation device 3 through the drain section 17. Here, the drainage unit 17 includes a strainer 18, a resistance plate 19, and a drainage duct 20, and the strainer 18 is provided to prevent the sorted objects from being sucked into the circulation device 3, The resistance plate 19 and the drain duct 20 are provided to prevent the influence of the vortex generated when the circulating device 3 sucks the liquid medium and to make the velocity distribution of the circulating flow in the sorting unit 10 uniform. In the present embodiment, the strainer 18 and the resistance plate 19 are provided separately, but it is also possible to combine them into one.

In the present embodiment, a gap is provided in the sorting section 10 by lowering the lower ends of the waterway dividing plates 2a, 2b, 2c from the bottom of the sorting section 10, and the first sediment discharging device 1 is provided in the gap.
1 and the sediment second unloading device 12 are installed, and the sediment first unloading device 11 and the sediment unloading device 12 are shared by the small waterways 1a, 1b, 1c and 1d, and the plastic sorting device is used. This is performed to reduce the size, and it is also possible to provide the two carrying-out devices 11 and 12 for each small channel.

Further, in this embodiment, in the sorting unit 10, the upper ends of the water channel dividing plates 2a, 2b, 2c are held below the water surface, and the floating plastic flows through the sorting unit 10 in the small channels 1a, 1b, 1c and 1d, the water is collected at the floating material discharging device 13, but water is sprayed to the opposite side of the floating material discharging device 13 from a plurality of nozzles directed toward the floating material discharging device 13. When the surface flow is formed on the surface of the water toward the floating object discharge device 13, the floating plastic can be positively collected by the surface flow.

Further, in this embodiment, a propeller type stirring device for separating air bubbles is used, and each of the flow passages is provided individually. However, the stirring device may be a flow-through type or a flapper type, etc. It is also possible to make one piece through 2a, 2b, 2c.

The plastic sorting apparatus of the present embodiment can add a small waterway. For example, a small channel unit 25 as shown in FIG.
5 may be installed on the side of the existing small channel. In this case, a flat plate 26 is provided on one side of the small channel unit 25.
It is necessary to prevent the liquid medium from flowing out from the bottom and the top of the selection unit 10. In addition, small waterway unit 2
If a plurality of 5 are prepared, a large-scale plastic sorting apparatus can be realized.

(Second Embodiment) FIG. 4 shows a second embodiment of the present invention and is a plan view of a plastic sorting apparatus. This embodiment is characterized in that, in the plastic sorting apparatus of the first embodiment, the amount of liquid medium to be supplied into each of the small channels 1a, 1b, 1c, 1d before each of the water supply ports 4a, 4b, 4c, 4d. Control valves 30a, 30
b, 30c, 30d and each small channel 1 from the injection port 21
Control valves 31a, 31b, 31c are provided for adjusting the injection amounts of the liquid medium to the liquid jets a, 1b, 1c, 1d. These control valves 30a to 30d and 31a to 31c are provided in order to expand the range of the size of the plastic that enables sorting. That is, a solid such as a plastic flowing in a fluid becomes smaller and floats more easily than a large solid. To settle such small plastics, the flow rate must be reduced. In the present embodiment, the flow velocity in each of the small channels 1a, 1b, 1c, 1d is changed based on this concept.

As described above, by changing the flow velocity for each of the small channels, the sorting of large plastics is performed in the small channels with relatively high flow rates, and the small plastic is sorted in the small channels with low flow rates. By dividing each of the small waterways, it becomes possible to select the optimum flow velocity for the plastic flowing through each small waterway, and it is possible to improve the sorting accuracy and to sort the plastics over a wide range of sizes.

Further, the flow velocity of each small channel can be adjusted by changing the resistance of the resistance plate 16 provided at the rear end of each small channel for each small channel. 30d and 31a to 31c, the flow rate can be more reliably adjusted.

FIG. 5 shows an example in which a classification device 35 is provided in the plastic sorting device. The classification device 35 classifies plastics mixed with various materials into large, medium, and small plastics by using a sieve or the like. Since there are three types of classification, large, medium and small, the plastic separator also has one small channel.
a, 1b, and 1c are provided. Then, the classified plastic is placed in each small channel 1 for each size.
a, 1b, and 1c. The flow velocity of the liquid medium in the small channel is the fastest in the small channel 1a, and the small channel 1b and the small channel 1
Since the order of c is later, the size of the injected plastic is large in the small channel 1a, medium in the small channel 1b, and small in the small channel 1c. As a result, as described above, the injected mixed plastic is sorted in each small channel at a flow rate suitable for the size of the injected plastic, so that sorting can be performed with high accuracy. As shown in FIG. 5, when the experiment was performed by classifying into three types, it was possible to sort mixed plastics of 1 to 100 mm with sufficient accuracy of about 98%.

The supply of the liquid medium to the injection port 21 in the above embodiment is shared with the circulation device 3 for supplying the liquid medium to the water supply ports 4a, 4b, 4c, 4d. For more accuracy, the circulation devices may be provided independently of each other.

[0039] (Third Embodiment) FIG. 6 shows an example of installing the plastic sorting apparatus having a classification device described in the second embodiment the waste disposal device.
In FIG. 6, reference numeral 50 denotes a stock yard for storing wastes roughly classified by type, and reference numeral 51 denotes a supply device for supplying the wastes from the stock yard 50 to the pretreatment device 52. The pretreatment device 52 includes a refrigerant recovery unit 53 and a large glass removal unit 54.
Consists of Reference numeral 55 denotes a crusher comprising one or two crushers, 56 denotes a light-weight sorting device, and 57 denotes a metal sorting device. The metal sorting device 57 includes a magnetic separator 58 and a non-ferrous metal separator 59. Reference numeral 60 denotes a plastic sorting device having a classification device.

With the above configuration, the present waste disposal apparatus enables sorting and recovery of plastics for each material as well as sorting of metals. By processing with this apparatus, it is possible to reduce the amount of landfilling of shredder dust and the like as much as possible. Becomes possible.

Next, the processing flow in the present waste disposal apparatus will be described by taking disposal of household electric appliances as an example. The waste home appliances collected by the collection vehicle are stored in the stock yard 50 in roughly four types including a refrigerator, an air conditioner, a television, and a washing machine. The waste home appliances stored in the stock yard 50 are taken out by type by the supply device 51 and sent to the pretreatment device 52. In the pretreatment device 52, when the waste home electric appliance is a refrigerator or an air conditioner, first, as shown by the arrow 100, the refrigerant in the refrigerator is extracted by the refrigerant recovery unit 53 described later, and the refrigerant is recovered as shown by the arrow 101. When the waste home electric appliance is a television, as indicated by an arrow 102,
The cathode ray tube is removed by the large glass removing section 54. Here, the large glass taking-out section 54 can use a structure of crushing and separating glass by a compressive force such as an impact-type crusher or a press that crushes and separates glass by hitting the glass several times with a hammer.

The waste home appliances subjected to these pretreatments are sent to the crushing device 55 as indicated by the arrow 104. Also,
In the case where the waste home electric appliance is a washing machine or the like and is a household electric appliance other than a refrigerator, an air conditioner, and a television, it is sent directly to the crusher 55 as shown by arrows 103 and 104. Crushing device 55
Is crushed to a size of about 50 to 100 mm by a one-stage or two-stage crushing mechanism and is released for each material. Particularly in the case of a refrigerator, it is necessary to release urethane foam from a thin iron plate, and for this purpose, a multi-stage crushing mechanism is advantageous.

The waste material crushed by the crushing device 55 and separated for each material is sent to a lightweight material separating device 56 as shown by an arrow 105, and the lightweight material separating device 56 separates a foamed material such as urethane foam. As a result, the foamed material is treated as light waste as indicated by an arrow 107 as shown in FIG.
The heavy waste that has been sent to
It is sent to the metal separation device 57 as shown by 06.

Here, as one of the structures of the light-weight material sorting device 56, air is applied to the waste discharged from the crushing device 55 by utilizing the property that the foam molding material is much lighter than other wastes. It is possible to use a structure in which the foam molding material is blown off by spraying and the foam molding material is separated. As another structure, it is possible to use a structure in which an inclined vibration conveyor is used, and a light foam molding material is taken out from an upper portion, and heavy other wastes are taken out from a lower portion.

In the metal sorting apparatus 57, first, a magnetic sorter 58
, The iron-based metal is separated and recovered as an iron-based metal as indicated by an arrow 108. Next, the non-ferrous metal is separated by the non-ferrous metal sorter 59 and collected as indicated by an arrow 109. As a result, the content of the remaining waste is mainly plastics. This plastic waste is indicated by arrow 110
Is sent to the plastic sorting device 60 as shown by.

The plastic sorter 60 has a classifier 35
The classification device 35 classifies the plastic into three types, large, medium and small, and takes out particularly fine ones (sand etc.) as dust as shown by arrow 111. Plastics classified into large, medium and small by the classifier 35 are indicated by arrows 112, 113 and 11 respectively.
As shown in FIG. 4, the water is sent to the small waterways 1a, 1b, and 1c. The flow velocity of the liquid medium in the small channels 1a, 1b, 1c is
Each is set according to the size of the plastic to be charged. That is, since the small channel 1a is the fastest, the small channel 1b is medium, and the small channel 1c is the slowest, the plastic in each small channel is an easily recyclable olefin-based olefin made of polyethylene or polypropylene indicated by an arrow 115. Plastic is the most group, arrow 11
6 is mainly composed of recyclable styrene-based plastics made of polystyrene or ABS resin, and vinyl chloride-based plastics, which are difficult to reuse due to generation of chlorine gas at the time of reuse as shown by arrow 117, Efficiently sorted into three types of groups and collected.

On the other hand, as shown by an arrow 107, the foam molded product separated by the lightweight material separating device 56 is
1 and separated into a solid resin portion and a gaseous foaming agent by a foaming agent recovery device 61, where the solid resin portion is separated and collected as indicated by an arrow 118, and the foaming agent is liquefied. Collected as indicated by arrow 119.

By separating and collecting as described above,
It is possible to recover the refrigerant and the chlorofluorocarbon which could not be recovered conventionally. In addition, since plastics suitable for reuse can be collected as resources by separating plastics in addition to collecting metals, the amount of waste to be landfilled can be significantly reduced.

[0049]

As described in detail above, according to the present invention,
By increasing the number of small waterway units, the sorting ability can be easily increased. In addition, if the flow velocity of the circulating flow is changed for each small waterway, and the objects to be sorted having different sizes are put in each small waterway, the sorting can be performed accurately and efficiently. Further, the power consumption of the device for generating the circulating flow is small, and a large amount of processing can be performed industrially.

[Brief description of the drawings]

FIG. 1 is a plan view of a plastic sorting apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the plastic sorting device shown in FIG.

FIG. 3 is a perspective view of a small channel unit.

FIG. 4 is a plan view of a plastic sorting apparatus according to a second embodiment of the present invention.

FIG. 5 is a plan view of a plastic sorting device having a classification device.

FIG. 6 is a diagram showing a case where a plastic sorting device is installed in a waste treatment device.

[Explanation of symbols]

 1a-1d Small channel 2a-2c Channel divider 3 Circulating device 4a-4d Water inlet 5 Hopper 6a-6d Stirrer device 7 Underwater channel 8 Upper guide 9 Lower guide 10 Sorting unit 11 Sediment first discharge device 12 Sediment second Unloading device 13 Floating material unloading device 14 Partition 15, 16 Receiving box 17 Drainage unit 18 Strainer 19 Resistor plate 20 Drain duct 21 Injection port 22 Valve 25 Small channel unit 26 Flat plate 30a-30d, 21a-21c Control valve 35 Classification device 50 Stock Yard 51 Supply unit 52 Pretreatment unit 53 Refrigerant recovery unit 54 Large glass take-out unit 55 Crushing device 56 Lightweight material separation device 57 Metal separation device 58 Magnetic separator 59 Nonferrous metal separator 60 Plastic separator 61 Foamer recovery device

Continuation of the front page (72) Inventor Nobuaki Arakane 502, Kandachi-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-6-154463 (JP, A) JP-A-6-226743 (JP) JP-A-6-126743 (JP, A) JP-A-6-339643 (JP, A) JP-A-56-56246 (JP, A) JP-A-49-25557 (JP, A) 63-218264 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B03B 1/00-13/06 B29B 17/00-17/02

Claims (5)

(57) [Claims] 1. A liquid medium tank in which a liquid medium is stored, circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and an object to be sorted in which objects having different specific gravities are mixed. A charging means for charging the liquid medium tank from the upstream side of the circulating flow, and the sorting object provided in the liquid medium tank and supplied by the charging means and flowing along the circulating flow, In a mixture sorting apparatus, comprising: a sorting unit that sorts by specific gravity using a specific gravity difference, and an unloading unit that unloads the sorted object selected by the sorting unit to the outside, the mixture is divided into a plurality in the liquid medium tank. Mixture sorting characterized by providing small waterways, installing the circulating flow generating means, charging means and sorting means for each of the small waterways, and having the unloading means shared by all of the small waterways. apparatus. 2. A liquid medium tank in which a liquid medium is stored, circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and an object to be sorted in which objects having different specific gravities are mixed. A charging means for charging into the liquid medium tank from the upstream side of the circulating flow, and by stirring the charged object to be sorted in the liquid medium,
Defoaming means for removing bubbles adhered to the object to be sorted, and the object to be sorted provided in the liquid medium tank and defoamed by the defoaming means and flowing in a circulation flow, The sorting object having a lower specific gravity is floated, and the sorting object having a higher specific gravity is settled to be separated, and the settling selected object is further separated by using the circulating flow. And a carrying-out means for carrying out the sorted objects to the outside.The mixture sorting device, comprising: a plurality of divided small water passages in the liquid medium tank; Means, a defoaming means and a sorting means, and the carrying-out means is configured to be shared by all of the small waterways. 3. A liquid medium tank in which a liquid medium is stored, circulating flow generating means for generating a circulating flow in the liquid medium in the liquid medium tank, and an object to be sorted in which objects having different specific gravities are mixed. A charging means for charging into the liquid medium tank from the upstream side of the circulating flow, and by stirring the charged object to be sorted in the liquid medium,
Defoaming means for removing bubbles adhered to the object to be sorted, and the object to be sorted provided in the liquid medium tank and defoamed by the defoaming means and flowing in a circulation flow, The sorting object having a lower specific gravity is floated, and the sorting object having a higher specific gravity is settled to be separated, and the settling selected object is further separated by using the circulating flow. And a carrying-out means for carrying out the sorted objects to the outside.The mixture sorting device, comprising: a plurality of divided small water passages in the liquid medium tank; Means, defoaming means and sorting means are installed, and the unloading means is shared by all of the small channels, and circulating flow velocity adjusting means for adjusting the flow rate of the circulating flow for each of the small channels is provided. A mixture sorting apparatus characterized by the above-mentioned. 4. The sorting apparatus according to claim 2, wherein the sorting means further generates a vortex in a part of the circulating flow in the liquid medium tank, and further separates the settled sorted objects by specific gravity. A mixture sorting device characterized by sorting. 5. The sorting apparatus according to claim 1, 2, or 3, wherein the input unit classifies the objects to be sorted by size,
A mixture sorting device, wherein the mixture is charged into each of the small channels by size.