JP2001009319A - Classifying treatment system for mixed waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new classifying treatment system for mixed waste, capable of efficiently classifying mixed waste in which a variety of waste materials are mixed, and improving the treatment and recycling of the mixed waste. SOLUTION: Mixed waste is separated into a plurality of sub-classes by classifying the mixed waste into a plurality of classes by a first classification means 12 and, furthermore, air-separating each class by second classification means 14a, 14b, 14c. Thereafter, the resultant wastes of the same sub-class after the air separation are collected together again to be classified with a third classification means 18 by using the specific gravity of water. In this way, the first classification means 12 such as sieves to carry out the classification based on the size, the second classification means 14a, 14b, 14c as an air separation means, and the third classification means 18 as a gravity separation means are combined in a specified style, realizing a new classifying treatment system which can classify mixed waste with high treatment efficiency and high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can easily and accurately separate mixed wastes in which a plurality of types of wastes are mixed, such as house demolition wastes and industrial wastes, thereby treating the mixed wastes. The present invention relates to a mixed waste separation treatment system capable of facilitating the recycling and improving the recycle rate.

[0002]

BACKGROUND ART For example, mixed waste generated when demolishing a structure such as a wooden house or reinforced concrete includes stone, soil, sand, concrete, ceramic and glass fragments, wood fragments, synthetic resin fragments and the like. Miscellaneous materials such as sheets, metals such as iron, paper waste, etc. are included in various shapes and sizes, and it is difficult to separate them, and there is no effective disposal method. Processing is also a social issue. That is, if such a mixed waste can be separated according to the type, size, etc., it can be used as a backfill material, a raw material such as plywood or paper,
Certain types can be incinerated, but in the past it was extremely difficult to reuse them because of the lack of appropriate separation means, and in some cases even disposal could not be possible due to environmental reasons. It is.

To cope with such a problem, for example, Japanese Patent Application Laid-Open No. H11-33487 discloses a method in which a plurality of flat screen sieves are formed such that the eyes gradually become smaller from the larger one to the lower one. , The mixed waste supplied on the uppermost sieve is divided into a plurality of classes by size by superimposing and vibrating on multiple stages, and then wind separation is performed for each separated class of waste. Thus, there has been proposed a sorting apparatus that separates heavy and light objects of each size, large and small.

[0004] However, in such a sorting apparatus, since the separation is performed only by the size and the wind power separation, the separation is not accurate, and it is also difficult to perform the accurate separation particularly by the specific gravity. Is not constant.

Japanese Patent Application Laid-Open No. H11-77014 discloses that mixed waste is crushed by a crusher, then the magnetic material is separated by a magnet device, and further separated into two sizes, large and small, by a trommel. There has been proposed a separation apparatus in which only a large-sized material is put into a water tank and separated into a large specific gravity material and a small specific gravity material.

However, such a separation apparatus has a problem that the separation of a small-sized one is insufficient, and the material is not constant.

[0007] Furthermore, Japanese Patent Application Laid-Open No. 9-313976 proposes a sorting apparatus that uses water specific gravity to separate the large and small specific gravity.

However, when all the mixed wastes are put into the water tank at once, in addition to the problem of the processing capacity of the water tank, a large amount of sludge-like sediment is generated at the lower part of the water tank, so that continuous processing can be performed. There was a problem that it became difficult. In addition,
The sorting apparatus using such a water tank is disclosed in
In combination with the sorting apparatus described in Japanese Patent No. 3487, it is conceivable to improve the sorting accuracy by performing sieve sorting and wind sorting, and then performing sorting by the specific gravity of water. It is necessary to set up a water tank for each of the multiple groups
It is not practical because the equipment is very complicated.

[0009]

The present invention has been made in view of the above-mentioned circumstances, and a solution thereof is to provide a mixed waste in which a plurality of types of waste materials are mixed.
Efficient and accurate separation can be performed, thereby improving the treatment and reuse of mixed waste.
An object of the present invention is to provide a novel mixed waste sorting system having a simple structure.

[0010]

An embodiment of the present invention which has been made to solve such a problem will be described below. In addition, each aspect described below can be adopted in any combination. Further, aspects and technical features of the present invention are described in the entire specification and the drawings without being limited to those described below.
Alternatively, it should be understood that the present invention is recognized based on the inventive concept that can be grasped by those skilled in the art from the description thereof.

First, the first aspect of the present invention is characterized by (a) first separation means for separating mixed waste into a plurality of classes according to size, and (b) the first separation means. Second sorting means for separating each of the mixed wastes into a plurality of subclasses by wind-selection for each of the classes separated by the separating means, and (c) separating the plurality of classes belonging to the same subclass from each other in the plurality of classes. In summary, the present invention provides a mixed waste separation treatment system including a third separation unit that separates a heavy object and a light object using the specific gravity of water.

In the separation processing system having the structure according to the above aspect, the wind is sorted by the second sorting means for each class whose size is adjusted to a predetermined range by the first sorting means. Thus, by appropriately adjusting the wind power for wind power sorting according to each class having a different size, the mixed waste can be sorted into subclasses according to the specific gravity and the surface area with high accuracy. In addition, among the objects classified with high accuracy, those belonging to the same subclass that is required are collected again, supplied to the third separation means, and separated by using the specific gravity of water, whereby a simple and compact structure is obtained. The apparatus can easily and accurately perform the separation according to the specific gravity, and reduce the burden on the third separation means by appropriately selecting the subclass supplied to the third separation means. Is also possible.

As the first sorting means, for example, as described in JP-A-11-33487,
It is also possible to use a vibration feeder type sieve device or a vibrating conveyor type sieve device in which plate-shaped sieves having different eye sizes are arranged side by side vertically and in a stepwise manner. The aspect of the present invention is a mixed waste sorting system configured according to the first aspect, wherein a trommel having sieves of different sizes in a plurality of stages in an axial direction is used, and the mixed waste is mixed with the trommel. It is desirable to classify into a plurality of classes by being introduced into a cylinder and transported in the axial direction. The size of the sieve can be appropriately set according to the type of the mixed waste and the type of the intended separation, and is not limited. For example, the sieve size is 15 mm, respectively.
Round holes and square holes of 25 mm, 80 mm, and 170 mm are adopted.

By employing such a trommel, clogging of sieves can be advantageously prevented, and stability of sieving and improvement in maintainability can be achieved. In particular, the sizes of the meshes are varied in multiple stages in the axial direction, so that the size of the meshes gradually increases from the inlet side of the mixed waste to the outlet side, and the sieves of each size are gradually increased. By providing a collecting section below the portion for collecting the sieved material, the mixed waste can be easily classified and collected according to size. It is also possible to employ an air blowing means for blowing compressed air inward from the outer peripheral surface of the trommel and forcibly blowing down mixed waste clogged or caught in the sieve into the trommel, By performing air blowing as needed or continuously, clogging of the sieve can be more advantageously prevented. Further, when adjusting the accuracy of the sieving by the trommel, the processing capacity, and the like, it is effective, for example, to be able to adjust the inclination angle of the trommel in the axial direction. In addition, in order to improve the accuracy and processing capacity of sieving by trommel, for example, it protrudes from the inner peripheral surface of trommel and extends circumferentially or spirally or axially and abuts the mixed waste that has been introduced. It is also effective to fix the blade to be used. Furthermore, it is desirable to provide a dustproof cover that covers substantially the entire outer peripheral portion of the trommel in order to improve the collection rate of small-sized earth and sand and the like and to improve the environment of the work place.

According to a third aspect of the present invention, there is provided a mixed waste sorting system structured according to the first or second aspect, wherein the mixed waste is at least separated by the first sorting means. Classify into four classes, and only the middle class classes excluding the largest class and the smallest class,
It is characterized in that each class is classified into subclasses by the second classification means. That is, what is classified into the class of the largest size by the first classification means generally includes large-sized wood, stone, and the like, and therefore, it is desirable that the classification be performed separately from the other classes. In addition, what is separated into the smallest size class by the first separation means is generally fine soil and sand, so it can be collected as it is to prevent unnecessary scattering and wetting, etc., and backfilled at the building site. As a material or the like, it is possible to facilitate transportation processing, reuse, and the like.

According to a fourth aspect of the present invention, there is provided a mixed waste sorting system structured according to any one of the first to third aspects, wherein the classification is performed by the first sorting means. It is characterized by providing a manual sorting line for placing and transporting only those having the maximum size. As described above, those classified into the largest size class by the first classification means generally include large-sized wood, stone, and the like. In some cases, according to such an embodiment, particularly large-sized waste can be reliably treated, and in particular, by performing manual sorting on a conveyor line such as a belt conveyor, the sorting operation can be easily performed. It is possible to do.

According to a fifth aspect of the present invention, there is provided a mixed waste sorting system having a structure according to any one of the first to fourth aspects, wherein the plurality of separated wastes are separated by the second sorting means. Of the subclasses of the subclasses are collectively supplied to the third classification means. According to such an embodiment, those belonging to a specific subclass and which do not require further separation are not subjected to the third separation means, thereby preventing the waste from being wetted by water. It is possible. Specifically, for example, the one having the largest ratio of specific gravity / surface area, which is separated by the second separation means, is generally a lump of stone or concrete.
It can be used as a backfill material for construction and civil engineering, and the one with the smallest specific gravity / surface area ratio is generally paper or thin wood chips, so it can be used as it is for papermaking and chips. It is.

According to a sixth aspect of the present invention, there is provided a mixed waste sorting system configured according to any one of the first to fifth aspects, wherein a water tank is used as the third sorting means. A water circulating device for discharging the heavy object settled at the bottom of the water tank from the water tank, generating a water flow near the water surface of the water tank, and overflowing the lightweight object with water, and the water circulating device And a take-out means for separating and taking out a light-weight object from the water overflowed in the step (1). In this embodiment, the floating material having a low specific gravity, such as wood, paper, and synthetic resin, can be very easily, automatically, and quickly taken out by overflowing the water with the water from the water tank. In addition, the water in the aquarium is also circulated, which is hygienic.

In this embodiment, as the discharging means,
It is also possible to arrange a conveyor etc. at the bottom of the water tank,
It is also effective to dispose a screw having large spiral blades at the bottom of the water tank and rotate it around the central axis so that the screw blades lift up heavy objects that have sunk to the bottom of the water tank. Thus, a large heavy object can be easily and reliably taken out. Further, in the present embodiment, for example, a wire mesh or fence with an open bottom is provided at a predetermined depth from the water surface, surrounding a periphery of a portion where the mixed waste is charged into the water tank. It is also effective to increase the processing efficiency by preventing the diffusion in the system. Furthermore, in the present embodiment, for example, in the surface layer of water, the water flow from the input portion of the mixed waste into the water tank toward the overflow portion is formed by using a pump or the like, and the air jet is blown out. It is also effective to carry out this process, especially when installing wire meshes and fences to prevent the diffusion of mixed waste, as described above, to prevent adhesion of mixed waste to these wire meshes and fences. Is also effective. Further, in this embodiment, preferably, a pump device for returning the overflowed water into the water tank and circulating the same is employed, but a water purification means such as a filter is provided on the circulation path of the water. Is desirable.

According to a seventh aspect of the present invention, there is provided a mixed waste sorting system having a structure according to any one of the first to sixth aspects, wherein the light weight separated by the third sorting means is provided. It is characterized in that a fourth sorting means for sorting objects according to size is provided. According to this embodiment, it is possible to separate the mixed waste with higher accuracy. In addition, as the fourth separation means, for example, a vibration sieve or the like that separates while sending by vibration may be suitably adopted, and the water and the mixed waste that are overflowed onto the vibration sieve are supplied together to thereby provide water. And the separation of the mixed waste and the separation of the mixed waste can be performed more efficiently.

According to an eighth aspect of the present invention, there is provided a mixed waste sorting system having a structure according to any one of the first to seventh aspects, wherein at least one of the mixed wastes separated by the second sorting means is provided. It is characterized in that a magnetic separation means for performing separation by magnetism is provided for one of the two subclasses. In this embodiment, metals such as iron and aluminum that can be used as resources can be separated from stones for backfilling. It is to be noted that the disposition position of the magnet type separation means is preferably set so that the one having a large specific gravity / surface area, which has been separated by the second separation means, is processed. Further, the specific structure of the magnet type separation means is not particularly limited, for example, it is also possible to arrange a magnet on the conveyance line of the mixed waste to adsorb the ferromagnetic material, but preferably By arranging permanent magnets at the end of the belt conveyor that transports the mixed waste, and adsorbing the ferromagnetic material onto the belt via the belt, the ferromagnetic material adsorbed on the belt is transferred by the belt. It is made to fall off automatically. In addition, by using a rotating permanent magnet,
It is also possible to separate the aluminum material from the ferromagnetic material such as iron by the action of the eddy current.

According to a ninth aspect of the present invention, there is provided a mixed waste sorting system having a structure according to any one of the first to eighth aspects, wherein the mixed waste sorting system is provided to the first sorting means. A crushing device for crushing mixed waste is provided. In this embodiment, regardless of the state of the mixed waste before the separation, the sizes after the separation can be made uniform. For example, large-sized wood, stone, concrete, and the like can be made substantially uniform and recycled. Usability can be further improved.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an overall schematic configuration of a mixed waste sorting system according to an embodiment of the present invention. The processing system of the present embodiment first loads the mixed waste charged in the charging hopper 10 into the trommel 12 as first sorting means,
By the trommel 12, depending on the size, (1)
Separation into minimum class waste, (2) small class waste, (3) medium class waste, (4) large class waste and (5) maximum class waste. Then, (2) small class waste, (3) medium class waste, (4) large class waste,
Each of the wind separation devices 14 as a second separation means
a, 14b, and 14c, wind force sorting is performed, and specific gravity /
Depending on the surface area, waste belonging to each of the classes (2) to (4) is individually separated into (6) specific gravity /
Separation into large subclass waste having a large surface area and (7) small subclass waste having a small specific gravity / surface area. After that, it was classified into each class of (2) to (4) (6)
The large subclass wastes are combined again, supplied to the magnet conveyor 16 as a magnetic type separation means, and separated by magnetism, so that the (6) large subclass wastes are (8) metal wastes. Separate only things. On the other hand, the (7) small subclass wastes sorted for each class of the above (2) to (4) are again collected into one, and they are collected in a water tank of the specific gravity sorting device 18 as a third sorting means. The waste is put into the apparatus 20 and separated by using the specific gravity of water, thereby separating (9) a heavy waste as a heavy substance having a large specific gravity and (10) a lightweight waste as a lightweight substance having a small specific gravity. . According to the processing system of the present embodiment, the hopper 10
Finally, the mixed waste put into the large waste is divided into (1) small-sized soil and sand selected as the minimum-class waste, and (4) large-sized waste sorted as the maximum-class waste. Wood, etc .; (6) large subclass waste; and (9) so-called gala consisting of stone and concrete fragments, tile fragments, etc. selected as heavy waste; (10) trees sorted as lightweight waste; It can be roughly classified into a total of five types of wastes, such as pieces of plastics and (8) metal wastes.

More specifically, as shown in a detailed model diagram in FIG. 2, the input hopper 10 in such a processing system has a substantially pyramid shape or a conical shape whose diameter decreases downward, and Mixed waste, which is an object to be subjected to separation treatment, is supplied from a large opening that is fixed above and that is opened vertically upward. This charging can be performed, for example, directly from a dump truck or the like, or can be performed using a backhoe or the like. Also, for example, 300
By arranging a grid-like iron net of about mm to 1000 mm square, it is possible to separate and remove extremely large-sized wood and the like mixed in the mixed waste at an initial stage.

Then, the mixed waste put into the input hopper 10 is dropped from a lower discharge port onto a belt conveyor 22 disposed below the mixed waste by gravity. The belt conveyer 22 conveys the mixed waste supplied on the belt at a substantially constant amount in an obliquely upward direction, and injects the mixed waste into the charging chute 24 of the trommel 12 at the front end of the conveyance. ing.

The trommel 12 is provided with a sieving plate 26 on the outer peripheral cylinder wall and is driven to rotate around an axis by an electric motor or the like. A variety of structures such as a shape and a pyramid shape can be adopted. Further, in order to adjust the accuracy and efficiency of the sorting, it is desirable that the inclination angle and the rotation speed of the central axis of the trommel 12 can be adjusted. Further, the sieve plate 26 of the trommel 12 is divided into four cylindrical wall portions 26a, 26b, 26c, 26d each having a predetermined width in the central axis direction, and the four cylindrical wall portions 26a, 26b, 26c, 2
In 6d, different sieve sizes are set. In these cylindrical wall portions, the size of the sieve is set to gradually increase from the axial end on which the input chute 24 is provided toward the discharge port 27, and particularly in the present embodiment. The first cylindrical wall portion 26a having a sieve of 15 mm, the second cylindrical wall portion 26b having a sieve of 25 mm, and the sieve of 80 mm are sequentially moved from the input chute 24 side toward the discharge port 27. And a fourth cylindrical wall portion 26d having a 170 mm sieve. In addition, such a sieve can be advantageously formed by, for example, forming a hole in a cylindrical wall portion formed of an iron plate, or adopting a lattice-shaped cylindrical wall portion.

The size of the trommel 12 is not particularly limited.
The length is 3000 mm and the axial length is in the range of about 5,000 to 15000 mm, which is appropriately selected according to the required processing capacity, the type of mixed waste, and the like. In addition, trommel 12
The number of rotations is not particularly limited, but is, for example, 5 to 30 rotations /
It is desirable to set to about minutes.

Although not explicitly shown in the drawings, it is desirable that the periphery of the trommel 12 be covered with a dust-proof cover formed of a metal plate or the like to prevent the dispersion of dust.
Further, on the outer peripheral surface of the trommel, it is possible to provide an air discharge port for blowing compressed air onto the outer peripheral surface of the cylindrical wall portion 26 of the trommel 12, whereby the sieve of the cylindrical wall portion 26 can be disposed. The clogged mixed waste can be forcibly removed with compressed air and returned to the inside of the tube wall of the trommel 12 again, thereby preventing a reduction in processing capacity due to clogging of the sieve.

Further, vertically below the trommel 12, the first sieves are independently located below the respective cylindrical wall portions 26a, 26b, 26c, 26d having different sieve sizes. , Second, third, fourth hopper 2
The hoppers 28a, 28b, 28c, and 28d are provided with hoppers 28a, 28b, 28c, and 28d, respectively. For each, the first, second, third, and fourth belt conveyors 30, 32, 34, 3
6 is carried out from the trommel 12. In addition, any of the cylindrical wall portions 26a, 26b, 26c,
The large mixture remaining in the trommel 12 to the end without being sieved by 26d is discharged from the outlet 27 of the trommel 12 and is carried out of the trommel 12 by the fifth belt conveyor 38.

The waste separated by the first cylindrical wall portion 26a and carried out by the first belt conveyor 30 is fine-grained soil or sand having a diameter of 15 mm or less as a minimum class waste. Thus, it can be reused as a material for backfilling a foundation at a construction site. The waste carried out by the fifth belt conveyor 38 is the largest waste having a diameter of 170 mm or more as the largest class waste,
In general, it is made of wood such as pillars or long reinforcing bars. Therefore, in the present embodiment, the fifth belt conveyor 38 is used as a manual sorting line, and the waste carried out by the fifth belt conveyor 38 is handed by a person standing next to the conveyor. By sorting by work, it is possible to properly separate large wood and steel bars and other things.

The small-sized waste having a diameter of 15 to 25 mm as small-class waste separated by the second cylindrical wall portion 26b and carried out by the second belt conveyor 32, and the small-sized waste separated by the third cylindrical wall portion 26c. 25-80 mm diameter medium-sized waste as medium-class waste that is separated and carried out by the third belt conveyor 34, or separated by the fourth cylindrical wall portion 26 d and carried out by the fourth belt conveyor 36. 8 as large class waste
Each of the large wastes having a diameter of 0 to 170 mm is a mixture containing wastes of various materials such as stone, wood, and synthetic resin. Therefore, the small, medium, and large-sized wastes are separated by the belt conveyors 32, 34, and 36 for each class by the small-sized wind separation device 14a, the medium-sized wind separation device 14b, and the large-sized The power is supplied to the wind separation device 14c. In the present embodiment, each of the wind power separation devices 14a, 14b, and 14c constitutes a second separation unit.

[0033] These wind separation devices 14a, 14b, 1
4c is a typical example, and FIG.
As shown in FIG. 4A, the mixed waste discharged from the trommel 12 is lifted obliquely upward by the belt conveyor 32, dropped downward by gravity from the upper end thereof, and discharged by the blower 46 onto the falling path. Air is blown out, and the hopper 5 is opened at a lower portion in front of the air outlet 48 of the blower 46 in a region near and far from the air outlet 48.
0,52 allows mixed waste to be collected separately.

As a result, large subclass waste having a large specific gravity / surface area and a small distance blown off by the air blown from the blower 46 is captured by the first hopper 50, while a small specific gravity / surface area of the blower 46 is small. The small subclass waste that is blown away by the blown air and that has a large distance is captured by the second hopper 52.
In the present embodiment, a comb-shaped chute 53 composed of a plurality of bars extending in the vertical direction is provided at a portion where the mixed waste falls from the belt conveyor 32. By changing the inclination angle, the falling speed of the mixed waste can be adjusted, and the wind separation ability can be adjusted. Further, above the first and second hoppers 50 and 52, a wire mesh 5 for catching an extremely lightweight object is located in front of the air outlet 48 of the blower 46.
4 are arranged and supported, and extremely lightweight objects such as paper pieces and resin sheets that are largely blown upward by the blown air of the blower 46 are separated and captured.

Further, the wind separation devices 14b and 14c having the same structure as the wind separation device 14a having the blower 46, the first and second hoppers 50 and 52, etc., are independent of each other. , The third belt conveyor 34 and the fourth belt conveyor 36 are disposed at the respective leading end portions. Thereby, the second belt conveyor 32
Waste discharged by the third belt conveyor 34
Medium waste discharged by the
It is possible to appropriately and independently set the wind power and the like in the wind power separation devices 14a, 14b, and 14c with respect to each of the large wastes carried out by the above-described method, and thereby achieve an efficient and excellent selection effect. You can get it.

And, these wind separation devices 14a, 1
The stones and trees separated by the trommel 12 by being sorted by size according to 4b and 14c,
Small, medium and large class wastes including various kinds of materials such as synthetic resin are captured by the first hopper 50 after removing extremely light materials such as paper and resin sheets. The large subclass waste and the small subclass waste captured by the second hopper 52 are separated with high accuracy.

Here, the large subclass wastes include metals such as iron and aluminum in addition to stones, concrete fragments, and tile fragments. Therefore, among the small, medium, and large class wastes, those separated as large subclass wastes are collected by a first collection belt conveyor 16 as a magnet conveyor, and only metal objects are removed. Then, the large subclass waste from which metal objects have been removed is transported by the belt conveyor 58, the chute 60, and the belt conveyor 62, and is finally separated as so-called looseness. That is, the waste is stone, concrete, tile, or the like having a size of about 25 to 170 mm, and can be reused as a backfill material for civil engineering or construction.

The magnet conveyor 16 is a conventionally known one. For example, a rotatable magnet is provided in an end rotating roller of a rubber belt type conveyor, and the magnet is used to make a strong magnet such as iron. The magnetic material is attracted, so that the ferromagnetic material such as iron wraps around the lower surface of the end of the conveyor and is separated from the lower surface of the end of the conveyor, unlike a nonmetallic material that is immediately dropped onto the belt conveyor 58 from the end of the conveyor. In addition, a material in which a conductive nonmagnetic material such as aluminum is separated by being repelled away by the action of an eddy current can be suitably used.

On the other hand, the wind separation devices 14a, 14b,
The small subclass wastes sorted by 14c include wood and synthetic resin fragments, as well as tiles and stone fragments with a small specific gravity / surface area. Therefore, among the small, medium, and large class wastes, those separated as small subclass wastes are collected by the second collection belt conveyor 64,
It is transported to the specific gravity sorting device 18. This specific gravity sorting device 18
As shown also in FIG. 4, a large water tank 20 having a substantially rectangular box shape and storing water is provided, and a bottom portion in the water tank 20 has a longitudinally extending discharge tank. Screw 6
8 is provided, and is driven around a central axis 66 by an electric motor (not shown) or the like. The discharge screw 68 includes a rotating blade 70 extending spirally around a central axis 66, and the rotating blade 70 is attached to the water tank 2.
It is supported slightly upward (for example, about several mm to several cm) from the bottom wall of the zero. Also, the bottom surface 7 of the water tank 20
Reference numeral 2 denotes an inclined surface that is inclined in the axial direction of the discharge screw 28, and objects that sink to the bottom of the water tank 20 and collect at the deepest portion are rotated from the deepest portion to the shallow bottom side of the water tank 20 by rotation of the discharge screw 28. Toward the bottom of the water tank 20, and the outlet 8 opened at the shallow bottom of the water tank 20.
From 8, the water is discharged out of the water tank 20. In addition, as the rotary blade 70 of the discharge screw 28, a ribbon type or the like is suitably adopted in addition to the standard type.

The width of the deepest portion of the water tank 20 is increased, and a part of the upper end of the outer wall at the deepest portion is cut out in a substantially rectangular shape with a predetermined width, thereby providing a dive structure. Is formed. Then, after the water stored in the water tank 20 is made to flow over the rectangular plate 74 and overflowed, the vibration screen 9
After passing through zero, the water is collected in a lower water collecting mass 76, pumped from a water collecting mass 76 to a water tank 80 by a pump 78, stored once, and then returned to the water tank 20 by a water supply pipe 82. It has become. That is, in the present embodiment, the water circulation device is configured to include the water collecting mass 76, the pump 78, the water tank 80, and the water supply pipe 82.

Further, at the deepest part of the water tank 20, the corner where the rectangular square 74 is formed is surrounded in a U-shape,
A fence body 84 is provided. The fence body 84 is formed in a lattice shape or a net shape by a hard material such as iron, and has a length protruding from the water surface at a predetermined height and penetrating to a depth that does not reach the bottom of the water tank 20. It is open to the atmosphere above the vertical and open to the water below the vertical. In addition, an opening of the water supply pipe 82 is provided on the peripheral wall portion of the water tank 20 facing the rectangular plate 74.
, So that a water flow from the fence body 84 toward the rectangular plate 74 is generated on the surface layer of the water stored in the water tank 20. In particular, in the present embodiment, the compressed air ejection pipe 86 is provided so as to open on the outer peripheral side of the fence 84, and the air jet ejected from the ejection pipe 86 also causes the fence 84 to form a rectangular shape. The water flow heading toward the wall 74 is generated on the surface layer of the water stored in the water tank 20.

Then, the small subclass waste conveyed by the second collection belt conveyor 64 is put into the water tank 20 in a portion surrounded by the fence body 84. As a result, among the small subclass wastes, those having a specific gravity higher than that of water sink down toward the bottom of the water tank 20, and then are transferred to the shallow side by the discharge screw 68, and then provided at the bottom of the water tank 20. The belt is taken out of the outlet 88 and transported by the belt conveyor 62. That is, what is taken out from the outlet 88 is 2
Stones and concrete of about 5 to 170 mm, so-called gala as heavy waste such as tiles, are grouped together with the gala selected as the large subclass waste, for example,
It is classified as waste that can be reused as backfill material for civil engineering and construction.

On the other hand, among the small subclass wastes, those having a specific gravity smaller than that of water float on the water surface of the water tank 20,
It rides on the water flow in the surface layer of the water, gets over the rectangular wall 74, is discharged out of the water tank 20 together with the water, and is put into the vibration screen 90. The vibrating screen 90 is a screen 9 provided with a sieve of an appropriate size by providing a load receiving plate (trough) of a vibrating conveyor (mechanical vibration conveyor).
2a, and only the water is dropped to collect the water in the water collecting mass 76 arranged below, and the light-weight waste floating in the water is separated from the water, sent out by vibrating action and accumulated. It has become. In particular, in the present embodiment, a sub-screen 92b having a finer mesh than the screen 92a is provided at a distance below the screen 92a.
Can also have a function as a vibrating conveyor. Then, for example, the screen 92
a is set to 80 mm and the sub screen 9
By setting the sieve of 2b to 15 mm, a large lightweight waste of 80 mm or more which is conveyed and separated on the screen 92a and a 80 mm or less size of conveyed and separated on the sub-screen 92b Small and lightweight waste can be separated.

The light-weight waste separated in this manner is treated as a landfill material in consideration of the size, etc., used as chip or the like for plywood material, or incinerated. It will be.

Therefore, by using the separation processing system of the present embodiment having the above-described structure, mixed waste containing various materials of various sizes and mixed is obtained.
It is possible to almost automatically separate the waste according to the material and size, whereby the reusability and the processability of the mixed waste can be extremely advantageously improved, and the excellent processability can be realized. is there.

In particular, in such a sorting system, by employing the trommel 12, it is possible to advantageously prevent clogging of sieves as compared with the case where a flat sieve or the like is employed. And efficient processing can be realized.

Before being supplied to the specific gravity sorter 18, the sieving by the trommel 12 and the wind sorter 1
Since the sediment is almost removed by the wind separation by 4a, b, and c, the contamination of the water in the water tank 20 can be prevented, the durability of the device can be advantageously secured, and the sanitation is excellent. Further, by providing a filter on the circulation path of water, it is possible to prevent water contamination more advantageously, and in this case as well, a decrease in durability of the filter due to earth and sand can be reduced or prevented.

In addition, before being supplied to the specific gravity sorting device 18, the sieving by the trommel 12 and the wind sorting device 1
4a, b, and c remove the load on the specific gravity sorting device 18 because the large-sized heavy objects are almost completely removed by the wind sorting, and, for example, employ a small specific gravity sorting device 18 having a small capacity. It is also possible to do.

Before being supplied to the specific gravity sorting device 18, the sieving by the trommel 12 and the wind sorting device 1 are performed.
4a, b, and c. Wind separation by sediment, stones, and the like from the mixed waste to some extent is removed, so that the wetness of the mixed waste can be minimized. Can be omitted, and a further improvement in the availability of the fractions can be achieved.

Further, the light-weight objects selected by the specific gravity sorting device 18 are also carried out together with the water by using the rectangular zigzag 74 having a dive zigzag structure, and then separated by draining. No special device is required for taking out from the apparatus, and the apparatus can be quickly taken out. In particular, in the present embodiment, since the vibration screen 90 is used for draining lightweight objects, clogging of the draining screen can be prevented, and the drained lightweight objects can be easily collected. .

By combining the devices with such a simple structure and minimizing the burden on each device as much as possible, an efficient mixture processing system can be constituted as a whole, and the mixed waste can be reduced. Thus, a new mixed waste sorting system with high processing capacity and processing accuracy, easy maintenance, and excellent durability has been completed.

The embodiment of the present invention has been described above in detail. However, this is merely an example.
By the specific description in such an embodiment,
It is not to be construed as limiting.

For example, the size of the sieves in the trommel 12 can be appropriately set and is not limited. Needless to say, the size of the sieves is also limited to four types as illustrated. Not.

Further, the position of the magnet type separation means is not limited to the conveyance path of the large subclass waste after the wind separation as shown in the example, but may be additionally or alternatively provided to the trommel 12. It can be appropriately installed at a position before the charging, a final position where the waste is discharged as a waste, and the like.

Further, in the above-described embodiment, the wind separation device 1
The large subclass waste sorted by 4a, 14b, and 14c is sorted as a waste as it is through the magnet conveyor 16, but the large subclass waste is manually sorted on the transport line of the large subclass waste.
Alternatively, it is also possible to use a separation means utilizing the specific gravity of water to more completely separate the pieces of wood mixed in the large subclass waste. The separating means using the specific gravity of water can be advantageously configured by, for example, the apparatus using the water tank described in the sixth embodiment.

Further, the means for transporting the mixed waste between the first sorting means and the second sorting means, between the second sorting means and the third sorting means, etc., is provided on a belt conveyor as illustrated. The present invention is not limited thereto, and various transporting methods can be adopted. For example, the transporting may be performed by using a transporting cart or a backhoe.

Further, those separated by the trommel 12 into a plurality of classes according to the size are subjected to a wind separation into a plurality of subclasses by different wind separation devices 14a, 14b, and 14c for each class. By collecting again those belonging to the same subclass and supplying the same to the specific gravity sorting device 18, high-precision sorting can be realized. Therefore, for example, in the above-described embodiment, the sorting by the trommel 12 is possible. The minimum class waste and the maximum class waste may be subjected to the wind sorting, and the wastes belonging to the same subclass after the wind sorting may be supplied to the sorting apparatus 18 all the time. Furthermore, depending on the type of mixed waste, the capacity of the blower 46, and the like, the large subclass waste captured by the first hopper 50 is collectively supplied to the specific gravity sorting device 18, while being captured by the second hopper 52. It is also possible to separate the small subclass waste as it is. Alternatively, it is possible to collectively supply the small subclass wastes captured by the second hopper 52 to the specific gravity sorting device 18 and supply the large subclass wastes to another specific gravity sorting device.

Further, the wind power sorting device 14a for each class,
The blowers 46 employed in the 14b and 14c need only be capable of independently setting the wind force or the like for each class, and need not be completely separate and independent.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be performed in embodiments, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0060]

As is apparent from the above description, in the mixed waste sorting system constructed according to the present invention, the sorting based on the size by a sieve or the like and the sorting based on the specific gravity / surface area are performed. By adopting a new combination that did not exist in the past, such as wind sorting that uses wind and sorting using water that separates based on the specific gravity, it is possible to efficiently and accurately mix mixed waste materials with multiple types of waste materials. You can separate them.

Moreover, in the mixed waste sorting system having the structure according to the present invention, by efficiently combining a plurality of types of sorting as described above, the processing efficiency of each device constituting the system is reduced. In addition to sufficiently increasing the processing load, the processing load can be reduced, whereby the miniaturization and the improvement of the durability of each device can be advantageously achieved.

[Brief description of the drawings]

FIG. 1 is a plan model diagram schematically showing a configuration of an embodiment of a mixed waste separation processing system structured according to the present invention.

FIG. 2 is a longitudinal sectional model diagram schematically showing a trommel and the like constituting the mixed waste sorting system shown in FIG.

3 is a longitudinal sectional model diagram schematically showing a wind separation device and the like constituting the mixed waste sorting system shown in FIG. 1;

FIG. 4 is a longitudinal sectional model diagram schematically showing a specific gravity sorting device and the like constituting the mixed waste sorting system shown in FIG. 1;

[Explanation of symbols]

 12 Trommel 14a, 14b, 14c Wind separator 16 Magnet conveyor 18 Specific gravity separator 20 Water tank 46 Blower 68 Discharge screw 90 Vibration screen

Continued on front page F term (reference) 4D004 AA31 AA46 AC05 BA02 CA04 CA08 CA09 CA10 CA13 CB09 4D021 AA15 AB02 BA11 CA11 DA05 DC02 EA10 EB01 FA02 GA02 GA08 GA12 GB01 GB03 HA01 4D067 DD01 DD06 EE01 EE11 GA20 GB05 A04A05A05A05A05A67A AB25 CA03 CA05 DA15

Claims (9)

[Claims] 1. A first separating means for separating mixed waste into a plurality of classes according to size, and wind-sorting the mixed waste for each class separated by the first separating means. A second sorting means for sorting into a plurality of subclasses, and a third sorting means for sorting together the plurality of classes belonging to the same subclass and separating them into heavy and light objects by using the specific gravity of water And a separation processing system for mixed waste. 2. As the first sorting means, a trommel having sieves of different sizes in a plurality of stages in an axial direction is used, and the mixed waste is put into a cylinder of the trommel and transported in an axial direction. The mixed waste sorting system according to claim 1, wherein the mixed waste is separated into a plurality of classes. 3. The mixed waste is separated into at least four classes by the first separation means, and a plurality of intermediate-size classes excluding a maximum-size class and a minimum-size class. 3. The mixed waste sorting system according to claim 1, wherein only the second class is classified into subclasses by the second classifying means for each class. 4. 4. The mixing device according to claim 1, further comprising a manual sorting line for placing and transporting only those having a maximum size classified by the first sorting means. Waste separation system. 5. The method according to claim 1, wherein only the subclasses belonging to some of the plurality of subclasses classified by the second classification unit are supplied to the third classification unit. 2. The mixed waste separation treatment system according to 1. 6. A water tank is used as the third separation means,
A water circulating device for discharging the heavy object settled at the bottom of the water tank from the water tank, generating a water flow near the water surface of the water tank, and overflowing the lightweight object with water, and the water circulating device 2. A take-out means for separating and taking out a light-weight object from water overflowed in step (1).
6. The mixed waste sorting system according to any one of claims 1 to 5. 7. The separation of the mixed waste according to claim 1, further comprising a fourth separation unit that separates the light-weight material separated by the third separation unit according to a size. Processing system. 8. A magnetic separation means for performing magnetic separation on at least one of the subclasses separated by the second separation means.
5. The separation system for mixed waste according to any one of the above. 9. The mixed waste sorting system according to claim 1, further comprising a crushing device for crushing the mixed waste supplied to the first sorting means.