JP4829744B2 - Sorting device - Google Patents

Description

  The present invention relates to a wet sorting apparatus for sorting a mixture by a specific gravity difference in a water tank.

As a sorter for a mixture utilizing the difference in specific gravity, a wet sorter that floats and settles a mixture in a water tank due to the difference in specific gravity is used in various fields.
For example, when obtaining wood chips as a papermaking raw material, this wet sorting apparatus is used in the field of separating heavy specific gravity as a foreign substance from a mixture mixed with heavy specific gravity such as gravel and iron pieces. A scooping conveyor is installed in the water tank to effectively collect wood chips of light specific gravity, and the water in the water tank is sucked from the back of the conveyor to the bottom of the vertical cylinder of the water tank where the heavy specific gravity sinks. It is supplied, and an upward flow is generated in the vertical cylinder, and the wood chips of medium to light specific gravity settling in the vertical cylinder are pushed back by the upward flow and scooped up by a conveyor (see Patent Document 1).
JP-A-62-79858

  In the field of waste disposal, aggregates having a specific gravity of 2.5 or more are collected from concrete, which is building waste, and reused. The collected aggregate is mixed with plastic pieces, wood pieces and the like. In the plastic piece in such a mixture, a light specific gravity such as polypropylene resin or polyethylene resin having a specific gravity less than 1 and a medium specific gravity such as vinyl chloride resin having a specific gravity greater than 1 are mixed. In addition, the wet wood piece has a specific gravity greater than 1 and may be mixed therein as a medium to light specific gravity object. When an aggregate is selected from such a mixture containing medium to light specific gravity using a wet sorter, the medium to light specific gravity that settles is mixed into the aggregate, and there is a problem that the accuracy of selecting the aggregate is deteriorated.

  In addition, the clay shooting range collects lead shots scattered in the soil field. From the mixture of collected soil and shots, the shots are classified as heavy specific gravity, and the soil is medium and light specific gravity. It is desirable to sort well.

  Prevents medium to light specific gravity with a specific gravity greater than 1 from being mixed into heavy specific gravity when sorting heavy specific gravity from a mixture using a wet sorter in the above-mentioned waste disposal field, clay shooting range, etc. In order to do this, it is conceivable to adopt a method of pushing back the medium-to-light specific gravity that has settled down with an ascending water flow and scooping it up with a conveyor, as described in Patent Document 1, but the specific gravity that is pushed back with the ascending water flow There is a possibility that an object is also picked up by the conveyor, and the heavy specific gravity material once picked up by the conveyor does not return to the water tank, so that there is a problem that the recovery rate of the heavy specific gravity material is lowered.

  Therefore, an object of the present invention is to prevent medium to light specific gravity from being mixed into heavy specific gravity without reducing the recovery rate of heavy specific gravity.

In order to solve the above problems, the present invention is to remove separated by suction by the suction tube a light specific gravity material in which floated at elevated water stream, a heavy specific gravity material having entered the suction tube by sinking under its own weight It was made to return to the aquarium.
In this way, the heavy specific gravity returns to the water tank without being sucked. Therefore, the heavy specific gravity that has settled in the water tank may be recovered in the same manner as in the prior art.

As a configuration of the present invention, in the sorting apparatus that puts the mixture to be sorted into the water tank and sorts the heavy and medium specific gravity substances in the mixture that settle to the bottom of the water tank due to the difference in specific gravity, , increased by the discharge of water water stream (hereinafter, simply "upflow" of.) and upflow generating tubes Ru floated light specific gravity was water in by generating the flotage floating in the water in the upflow A suction tube that sucks upward from the downward opening is provided, and the suction force of the suction tube is set so that the weight of the gravity gravity sinks even if the heavy specific gravity enters the suction tube.

Since the suction force of the suction pipe is determined by the flow cross-sectional area of the suction pipe, the suction flow rate, the capacity of the suction pump, etc., set them appropriately by experiment, actual operation, etc. Even if it enters, it will settle down by its own weight.
For example, if the suction flow rate of the suction tube is made slower than the flow rate of the upward flow, the mixture containing heavy specific gravity will rise by the upward flow, and even if the mixture is sucked into the suction tube, the flow rate in the suction tube is slow Therefore, of the mixture, the heavy specific gravity sinks down to the lower part of the suction tube by its own weight. That is, since the suction flow rate is slower than the flow rate of the upward flow, the heavy specific gravity lifted by the strong upward flow is not sucked by the weak suction flow, but sinks below the suction pipe by its own weight, so that accurate selection is performed.

As a means for making the suction flow velocity slower than the flow velocity of the upward flow, for example, the opening area of the upward flow generation tube is made smaller than the flow cross-sectional area of the inlet portion of the suction tube that sucks upward from the opening of the suction tube. It is conceivable. When the opening areas (flow cross-sectional areas) are different in this way, normally, an upward flow is generated from the opening of the upward flow generation pipe, so that the mixture containing heavy specific gravity rises with the upward flow and enters the suction pipe. In some cases, the suction flow rate is slower than the ascending flow rate during the suction, and the heavy specific gravity sinks below the suction tube by its own weight without being further sucked into the suction tube. This difference in flow cross-sectional area is effective when the same flow rate is allowed to flow through the upflow generation pipe and the suction pipe.
The length of the inlet portion of the suction pipe (see L in FIG. 2) is appropriately set in consideration of the flow velocity and the like by experiments so that the heavy specific gravity that has entered the inlet portion sinks smoothly due to its own weight.

The opening of the upward flow generating pipe may be any position in the water tank as long as it is a position that generates the upward flow in the water tank. However, the mixture thrown into the water tank by the upward flow is floated smoothly by experiment, actual operation, etc. Set the position appropriately.
As for the positional relationship between the opening of the upflow generating pipe and the opening of the suction pipe, an appropriate distance and angle should be set between the openings by experiment, actual operation, etc. so that the suspended matter suspended in the water by the upflow can be sucked smoothly. Hold and set to face each other. In this case, it is desirable to have a positional relationship in which all of the mixture excluding the heavy specific gravity and only a part of the heavy specific gravity are sucked.

In these configurations, the inside of the water tank can be divided into a plurality of rows by, for example, vertical partition plates along the flow direction of the mixture, and the suction pipes can be provided in each of these partitioned rows. .
In this way, the upward flow is rectified by the partition plate, so that the medium to light specific gravity can be stably suspended.

At this time, the mixture put into the water tank is sized by a sieve in advance, and the sized mixture is separately put into each of the partitioned rows, thereby selecting a specific gravity as a branch point. Accuracy can be increased. In other words, if the size of the mixture is the same, the buoyancy that the mixture is subjected to by the upward flow is almost equal. .
The smaller the buoyancy, the smaller the buoyancy that is received, but the settling force due to its own weight is greatly reduced, so if you do not perform sizing, the small specific gravity will be larger in size than the specific gravity. There is a risk of being sucked into a suction tube together with a small mixture and discharged to the outside.
Therefore, if sizing is performed, the strength of upward flow in each row is changed, and the heavy specific gravity and medium light specific gravity for each size are separated into the sedimentation side and the upward side only by the difference in specific gravity. It is possible to increase the sorting accuracy by reducing the influence of the difference.

  The upflow may be generated by one upflow generation pipe, but an upflow generation pipe is provided for each of the partitioned rows, or an upflow generation pipe is provided for every two or more rows. can do. In the latter case, the opening of one upflow generating tube faces two or more rows.

  A plurality of suction pipes can be provided in order in the flow direction of the mixture. In this way, the suction force of the suction pipe is increased (intensified) stepwise in the flow direction of the mixture, that is, by increasing the suction force of the suction pipe downstream from the upstream side of the mixture flow. The specific gravity of an object sucked (captured) from each suction tube can be changed, and the different specific gravity can be selected and captured. The number of suction tubes is appropriately set according to the number of specific gravity differences to be captured.

At this time, an upflow generation pipe is provided for each of the suction pipes so that the upflow by the upflow generation pipes becomes stronger in order in the flow direction of the mixture (the upflow speed increases in order). By setting, it is possible to perform smooth floating and suction according to the specific gravity of what is to be captured.
For example, when two upflow generation pipes are provided, a medium or light specific gravity material such as plastic having a specific gravity greater than 1 is sucked by the suction pipe on the front side (upstream side of the mixture flow), and then the rear suction In the tube, iron, copper, lead that was not sucked in the front and back suction pipes by sucking heavy specific gravity that is relatively low in specific gravity such as aggregate among the heavy specific gravity that was not sucked in the front suction pipe Heavy specific gravity with a very high specific gravity such as metal, heavy specific gravity with relatively low specific gravity such as aggregate sucked in the rear suction tube, and medium to light specific gravity sucked in the front suction tube Three types can be selected.
Further, since the suspended matter that is not sucked by the front suction tube can be sucked by the rear suction tube without changing the suction force of each suction tube, the sorting accuracy can be improved.
Furthermore, if an upward flow generating pipe is provided for each suction pipe, the mixture can be smoothly floated and sent to each suction pipe, and the selection accuracy can be further improved.
In these cases as well, the positional relationship between the opening of the upflow generating pipe and the opening of the suction pipe is such that the suspended matter with the required specific gravity suspended in the water in the upward flow is smoothly drawn without sucking in the desired specific gravity as much as possible. The two openings are set to face each other at an appropriate distance and angle so as to allow suction.

If each of the openings of the upward flow generating pipe and the suction pipe has a long hole shape (not only elliptical shape but also rectangular shape, see FIG. 14) that is long in the transverse direction to the flow direction of the mixture, the upward flow In the water tank, the flow becomes narrow and a clear flow is generated, and the suction flow is narrow in the flow direction of the mixture, so that the suction action is also ensured.
The length of the long hole is appropriately set according to the length in the lateral direction with respect to the flow direction of the mixture and the width of the water tank. Further, the width of the long hole is also set appropriately in consideration of the degree of upward flow formation and the degree of suction.

In these configurations, an inclined screen having a lower end opened as a discharge end is inclined between the upward flow generating pipe and the suction pipe in the water tank so as to be inclined downward in the flow direction of the mixture. The mixture can be introduced into the upper end side of the water and the heavy specific gravity can sink to the bottom of the water tank from the discharge end on the lower end side.
In this way, the mixture that has settled in a collective state on the inclined screen floats while being swirled by the upward flow, so that the medium to light specific gravity can be separated smoothly, and the heavy specific gravity can be separated from the screen. Is lowered and sinks to the bottom of the tank. That is, the separation of medium and light specific gravity and heavy specific gravity becomes smooth, and it is only necessary to apply an upward flow to the mixture that has settled in the collective state, so the amount of upward flow (water amount) can be reduced (with a small upward flow). The mixture can be efficiently levitated).
At this time, if an opening of the upward flow generating tube is provided below the inclined screen at a predetermined position in the inclined direction, for example, on the discharge end side, only an upward flow is generated in a partial region of the water tank, Medium and light specific gravity can be suspended below the surface of the water, and the amount of water in the upward flow can be reduced. In this case, the upflow generating pipe may be opened at another position below the inclined screen.

  By providing means for applying vibration to the inclined screen, the medium to light specific gravity sedimenting on the screen can be reliably floated by the upward flow and selectively sucked into the suction pipe, thereby further improving the sorting accuracy. Moreover, clogging of the screen can be prevented.

By providing a reservoir for the mixture to be introduced on the upper end side of the inclined screen, the mixture causes the heavy specific gravity to be distributed downward and the medium specific gravity to be distributed upward due to its own weight difference. After that, since it moves to the upper end side of the inclined screen, the medium to light specific gravity unevenly distributed on the upper side can be floated smoothly by the upward flow and can be easily sucked into the suction pipe.
At this time, if the storage portion is continuous with the inclined screen, the storage portion also vibrates as the inclined screen vibrates, so that the mixture that has reached the storage portion causes the heavy specific gravity material to move downward. The action of unevenly distributing the medium to light specific gravity upward is promoted.

  According to the present invention, since the heavy specific gravity material sinks to the bottom of the water tank without being sucked as described above, the recovery rate of the heavy specific gravity material is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. This sorting device 1 is used in a collection facility for aggregates contained in concrete, which is a construction waste material, and removes wooden pieces and plastic pieces mixed in the aggregates.

As shown in FIG. 1, the concrete is crushed by a crusher 21, and large foreign matters are removed by hand sorting and then passed through a sieve 22 to remove minute foreign matters having a size of about 2 mm or less, and 40 mm. The larger crushed material is returned to the crusher 21 and re-crushed. The crushed material having a size of 40 mm or less is subjected to removal of iron by the magnetic separator 23 and then rubbed with the grinding machine 24 to remove the cement mortar adhering to the aggregate. Sieving.
In this embodiment, it is sieved to a size of less than 7 mm, 7 to 13 mm, 13 to 20 mm, 20 to 28 mm, 28 to 40 mm, and is put into the wet sorting apparatus 1. The processed material put into the wet sorting apparatus 1 is a mixture D in which wood pieces and plastic pieces are mixed into the aggregate.

  As shown in FIGS. 2 and 3, the wet sorting apparatus 1 has a horizontally elongated rectangular basket 3 with a horizontally open upper surface opening suspended in a horizontally elongated rectangular water tank 2. The basket 3 is partitioned into five rows in the width direction (left-right direction in FIG. 3) by the vertical partition plate 4, and the mixture D sieved into five different sizes by the sieve 25 in each row. The shoot 5 is inserted.

In addition, the partition position of each partition plate 4 is variable, and the width of each row can be adjusted according to the amount of processing of each size of the mixture D.
The bottom of the basket 3 is provided with an inclined screen 6 inclined downward from the supply end 3a into which the mixture D is introduced to the discharge end 3b on the other end side. Vibration is applied by the vibration generating means 7. The vibration generating means 7 applies vibration by moving the basket 3 up and down by changing the contact position with the basket 3 by the circular movement of the vibration transmitting plate 7a (see the arrow in FIG. 2).

  In each row of the baskets 3 partitioned by the partition plate 4, an upward flow generating pipe 8 opened upward for generating an upward flow in the middle of the inclination of the inclined screen 6, and an underwater floating that floats in the water by the upward flow A suction tube 9 opened downward for sucking an object is provided. The upward flow generating pipe 8 and the suction pipe 9 face each other in an oblique direction, and the distance between the openings 8a and 9a is set to a distance at which the upward flow does not decay. In addition, the lower end side of the inclined screen 6 is opened at the discharge end 3b of the basket 3, and a conveyor 10 for scooping up floating objects on the water surface is provided near the outer water surface, and the water tank 2 on the discharge end 3b side. A discharge screw 11 for discharging the sediment is provided at the bottom.

Among the mixture D put into each row of the basket 3 from the chute 5, the heavy specific gravity A such as aggregate quickly settles on the inclined screen 6 and moves downward on the inclined screen 6 to the discharge end 3b side. After that, it sinks to the bottom of the water tank 2 from the open discharge end 3 b on the lower end side, and is collected by the rotating discharge screw 11. Some heavy-weight material A floats in the water by the upward flow from the upward flow generation pipe 8 while moving downward on the inclined screen 6, but does not get on the upward upward flow toward the suction pipe 9, and is inclined. Settling on the screen 6.
Further, even if the heavy specific gravity object A rides on the flow and is sucked into the suction pipe 9, the suction pipe 9 opens downward and is inclined upward from the opening 9a. More than the suction force) and sinks again onto the lower inclined screen 6.

The upward inclination angle of the suction tube 9 can be adjusted, and the boundary of the specific gravity of whether or not the suction tube 9 is sucked can be adjusted. As the inclination angle upward of the suction tube 9 is made gentler, a larger specific gravity is sucked into the suction tube 9.
Further, the flow rate of the upward flow and the flow rate in the suction pipe 9 are set larger as the size of the mixture is larger.
Further, the upward flow from the upward flow generation pipe 8 and the suction flow of the suction pipe 9 are formed by one pump (see FIG. 5) or are formed by separate pumps. At that time, the flow cross-sectional area of the suction tube 9 and the capacity of the pump are appropriately set so that the suction force (suction flow velocity) of the suction tube 9 is reduced by its own weight even when the heavy gravity A enters the suction tube 9. At the same time, the flow cross-sectional area of the upward flow generating pipe 8 is set as appropriate.

Among the wood pieces and plastic pieces contained in the charged mixture D, the medium to light specific gravity B having a specific gravity greater than 1 slowly settles and moves downward on the inclined screen 6, and in the middle of the upward flow generation pipe It floats in water by the upward flow from 8 and is sucked into the suction pipe 9 and discharged to the outside. Further, the light specific gravity C having a specific gravity smaller than 1 floats on the water surface, moves to the discharge end 3b side, is picked up by the conveyor 10 and discharged to the outside.
Since the inclined screen 6 is vibrated, the medium to light specific gravity B is naturally on the upper side due to vibration even if it is below the heavy specific gravity A having a large specific gravity, and is reliably suspended by the upward flow. be able to. Further, the inclined screen 6 is not clogged.

  FIG. 4 shows a second embodiment. This sorting device 1 also sorts aggregates from the mixture D mainly composed of aggregates. Like the first embodiment, the sorting apparatus 1 includes a horizontally long basket 3 suspended in a horizontally long water tank 2. An inclined screen 6 is provided at the bottom, and an upward flow generating tube 8 that generates an upward flow from below while the inclined screen 6 is inclined, and a suction tube 9 that sucks floating matter floating below the water surface by the upward flow are provided. ing.

The basket 3 is not partitioned by a partition plate, and the mixture thrown into the supply end 3a from the chute 5 is not divided according to size. It sinks to the bottom of the water tank 2 from the discharge end 3 b on the lower end side, and is collected by the discharge screw 11. Further, the medium to light specific gravity B settles on the inclined screen 6 and moves downward, floats below the surface of the water by the upward flow from the upward flow generation pipe 8, and is sucked by the suction pipe 9 and discharged to the outside. The light specific gravity C floats on the water surface, moves to the discharge end 3b side, is lifted up by the conveyor 10 and discharged to the outside.
Further, even if the heavy specific gravity object A rides on the flow and is sucked into the suction tube 9, the sinking force due to its own weight exceeds the buoyancy (suction force) due to suction, and sinks again onto the lower inclined screen 6.
In this embodiment, the vibration generating means 7 can be appropriately employed.

  FIG. 5 shows a third embodiment. The sorting device 1 has no basket 3, and a plurality of upward flow generation pipes 8 cover almost the entire bottom surface along the bottom inclined downward from the supply end 2a side to the discharge end 2b side of the horizontally long water tank 2. Are arranged as follows. Under the water surface, a suction pipe 9 similar to that in the second embodiment is opened downward, and the water in the water tank 2 is sucked into the suction pipe 9 by the pump 12, and the sucked water passes through the filter 13 and has a medium to light specific gravity. After B is removed, it is circulated and used, and discharged again from each upward flow generating pipe 8 so as to generate an upward flow in the water tank 2. Further, a conveyor 10 that scoops up floating objects on the water surface is provided near the water surface on the discharge end 2b side, and a discharge screw 11 is provided on the bottom on the discharge end 2b side.

  In this embodiment, among the mixture D put into the supply end 2a of the water tank 2 from the chute 5, the heavy specific gravity A that settles moves down the bottom of the water tank 2 that is inclined downward toward the discharge end 2b side, The medium to light specific gravity B, which is sorted and collected by the discharge screw 11 and slowly settles, floats in the water by the upward flow from each upward flow generation tube 8 and is sucked into the suction tube 9 and discharged to the outside. Moreover, the light specific gravity C which floats on the water surface is scooped up by the conveyor 10, and is discharged | emitted outside. Furthermore, even if the heavy specific gravity A rides on the flow and is sucked into the suction pipe 9, the sinking force due to its own weight exceeds the buoyancy (suction force) due to suction, sinks again onto the bottom surface of the water tank 2, and is discharged due to its inclination. Move toward the screw 11.

FIG. 6 shows a fourth embodiment. This sorting apparatus 1 is provided with a plurality of suction pipes 9 in order along the flow direction of the mixture D in a plan view of the water tank 2, and each suction pipe 9 ₁ , 9 provided ₂ upflow generating tube ₈₁ with respect ..., _{8 2} ... respectively, the lifting power of the suction pipe ₉ 1, _{9 2} ... suction force and upward flow generating tube 8 in the flow direction It is something that strengthens in order.
In this embodiment, since the flow cross-sectional areas of the suction pipes 9 ₁ , 9 ₂ ... Are the same, and the flow cross-sectional areas (opening areas) of the respective upflow generation pipes 8 ₁ , 8 ₂ . The suction force and ascending force were changed by changing the suction flow rate and the ascending (discharge) flow rate.

This embodiment, with the light density object B is sucked and discharged by the suction pipe 9 ₁ in floating in water by upflow from upflow generating tube _81, a relatively small specific gravity heavy specific gravity material A of the aggregate such 'is suspended in the water by a strong upward flow from the second upflow generating tube _82, it is sucked and discharged by a strong suction force second suction pipe 9 _2, further its heavy specific gravity thereof a' little more than The heavy heavy specific gravity A ″ floats in the water by the strong upward flow from the _third upward flow generation tube 83 and is sucked and discharged by the _third suction tube 93 having a strong suction force. At this time, a heavy specific gravity thereof A, A ', A' also 'is sucked into the suction pipe 9 _1, 9 ₂ ... on stream, depending on the suction force of the suction pipe 9 _1, 9 ₂ ... It is sucked as it is, or the sinking force due to its own weight exceeds the buoyancy (suction force) due to suction, sinks again onto the lower inclined screen 6, and further sinks to the lower end discharge end 2 b of the water tank 2.
In this way, three stages of suction sorting are performed, and the heavy specific gravity A is sorted by specific gravity (A ′, A ″), and from the discharge end 2 b on the lower end side of the water tank 2, steel, copper, Only the heavy specific gravity A having a very high specific gravity of a metal such as lead sinks into the discharge screw 11 and is selected.

  In this embodiment, the basket 3, the inclined screen 6, the vibration generating means 7 and the like can be appropriately employed. Further, the number of suction pipes 9 and upflow generation pipes 8 is appropriately set according to the selection number of the mixture D. Further, if the inclined screen 6 is provided as shown by the chain line in FIG. 4, the mixture D moves on the screen 6 as shown in FIG.

  FIG. 7 shows a fifth embodiment. In this sorting apparatus 1, the water tank 2 is long and deep, and the mixture D is introduced from a chute 5 inserted into water having a middle depth. A plurality of upward flow generation pipes 8 are provided below the chute 5 so as to cover almost the entire cross section of the water tank 2, and a suction pipe 9 opened downward is provided above the chute 5, which is the third embodiment. In the same manner as in the embodiment, the water in the water tank 2 is sucked into the suction pipe 9 by the pump 12, and the sucked water is circulated and used after the medium and light specific gravity B is removed through the filter 13, and each upward flow is generated again. The pipe 8 is discharged so as to generate an upward flow in the water tank 2. Further, a conveyor 10 that scoops up floating objects on the water surface is provided near the water surface, and a discharge screw 11 is provided at the bottom.

  In this embodiment, of the mixture D introduced into the water from the chute 5, the heavy specific gravity A that settles at the bottom of the water tank 2 is selected and collected by the discharge screw 11, and the medium and light specific gravity B is separated from each upward flow generating pipe 8. It floats in water by the upward flow from and is sucked into the suction pipe 9 and discharged to the outside. The light specific gravity C that floats on the water surface is picked up by the conveyor 10 and discharged to the outside. Further, even if the heavy specific gravity A rides on the flow and is sucked into the suction pipe 9, the sinking force due to its own weight exceeds the buoyancy (suction force) due to suction, and sinks downward again.

8 and 9 show a sixth embodiment. As in the first embodiment, the sorting device 1 includes a horizontally long basket 3 suspended in a horizontally long water tank 2 divided into five rows by a partition plate 4, and each of these rows has five types. The mixture D sieved to the size of is fed from the chute 5.
A bottomed storage section 14 is provided on the supply end 3a side of the basket 3 into which the mixture D is charged, and the bottom of the storage section 14 faces downward toward the discharge end 3b as in the first embodiment. An inclined inclined screen 6 is connected (continuous), and vibration is applied to the bottom of the reservoir 14 and the inclined screen 6 by the vibration generating means 7 attached to the basket 3.

The bottom of the storage portion 14 is slightly inclined downward toward the inclined screen 6, and the discharge screw 15 that penetrates the side walls of the water tank 2 and the basket 3 and the partition plates 4 of each row at the downward inclined end side at the water surface portion. The light specific gravity C floating on the water surface of each row is discharged to the outside from the opening 15a opened in each row. On the rear surface side of the discharge screw 15, a weir 16 is provided to dam the light specific gravity C that floats on the water surface.
The vibration generating means 7 is attached to the side wall of the basket 3 above the discharge screw 15, and the side wall portion of the water tank 2 through which the discharge screw 15 penetrates is transmitted through the side wall of the basket 3 and the discharge screw 15. In order to absorb this, the flexible cover 17 is connected to the surrounding side walls.

Further, in the middle of the inclination of the inclined screen 6, for each row of the basket 3, an upward flow generating pipe 8 that generates an upward flow from below and a suction pipe 9 that sucks underwater suspended matters floating in the water by the upward flow. Are provided so as to oppose each other so that the respective openings 8a, 9a extend over substantially the entire width direction of the inclined screen 6. Each upward flow generating pipe 8 and each suction pipe 9 are divided and arranged for each row, and each opening 8a, 9a for each row has a long hole shape with a rectangular cross section. The cross-sectional area of the inlet portion is formed to be larger than the area of the opening 8a of each upward flow generating tube 8.
In addition, the discharge screw 11 which discharges a sediment is provided in the bottom of the water tank 2 by the side of the discharge end 3b similarly to the thing of 1st Embodiment.

In this embodiment, each of the sized mixtures D fed from the shoots 5 to the storage portions 14 of each row is subjected to vibration applied to the bottom of the storage portions 14 so that the heavy specific gravity A is moved downward. The specific gravity B is unevenly distributed upward.
Then, while maintaining this state, the medium to light specific gravity B, which passes through the lower side of the weir 16 and moves to the upper end side of the inclined screen 6 and is unevenly distributed on the inclined screen 6, is also connected to each upward flow generating pipe 8. It floats in water by the upward flow from and is sucked into each suction pipe 9 and discharged to the outside.
The heavy specific gravity A that moves while being unevenly distributed on the inclined screen 6 sinks into the inclined screen 6 again even if it enters the suction pipe 9 in an upward flow, and the discharge end 3b on the lower end side of the inclined screen 6. Sunk into the discharge screw 11 at the bottom of the water tank 2, and is collected from the discharge port 11b. The flow rate of the upward flow and the flow rate in the suction pipe 9 are set to 0.7 m / s for the smallest size column and 1.8 m / s for the largest size column, for example.
Thus, since the suction speed is set according to the size of the mixture D, even if the heavy specific gravity A is sucked by each suction pipe 9, it exceeds the predetermined specific gravity and is again on the screen 6 below. Sink.
In addition, the light specific gravity C in the mixture of each sized column floats on the water surface, enters each opening 15a of the rotating discharge screw 15, and is discharged to the outside collectively from the discharge port 15b.

FIG. 10 shows a first modification of the sixth embodiment. In the first modification, an upward flow stronger than the upward flow generation tube 8 is generated on the discharge end 3b side of the basket 3 relative to the upward flow generation tube 8 and the suction tube 9 provided in the middle of the inclination screen 6. a second upflow generating tube ₈₂ to a suction pipe 9 ₁ second suction pipe 9 ₂ strong suction force than is the opening 8a, the 9a each other facing each other in the lower and upper inclined screen 6 It is provided as follows.
In this first modification, together with the light density object B is sucked and discharged by the suction pipe 9 ₁ in floating in water by upflow from upflow generating tube _81, a small heavy specific gravity relatively specific gravity of the aggregate such The object A ′ floats in water by the strong upward flow from the _second upward flow generation pipe 82 and is sucked and discharged by the _second suction pipe 92 having a strong suction force. At this time, 'when it is sucked into the suction pipe 9 _1, 9 ₂ on stream, the front side of the suction pipe 9 ₁ In both the heavy specific gravity was A, A' heavy density material A, A together subsidence force by its own weight is sucked exceeds than the buoyancy (attraction force) due, sinks back to the lower inclined screen 6 above the rear suction pipe 9 ₂ in iron, copper, heavy density material a such as lead from the buoyancy due to subsidence force suction by its own weight Then, it sinks again onto the lower inclined screen 6 and the heavy specific gravity object A ′ having a relatively low specific gravity such as aggregate is sucked as it is and led to the outside.
Therefore, two-stage suction sorting is performed to sort the heavy specific gravity A by specific gravity (A and A ′), and from the discharge end 3b on the lower end side of the inclined screen 6, iron, copper, lead, etc. Only heavy specific gravity A having a very high metal specific gravity sinks into the discharge screw 11 and is sorted.

FIG. 11 shows a second modification of the sixth embodiment. In this second modification, a second discharge screw 11a is provided on the front side of the discharge screw 11 provided at the bottom of the discharge end side of the water tank 2, and a horizontal flow from the discharge end side of the water tank 2 to the front side. There is provided a nozzle 18 for generating.
Therefore, of the heavy specific gravity A that sinks from the discharge end 3 b on the lower end side of the inclined screen 6, the heavy specific gravity A ′ having a relatively small specific gravity such as aggregate is affected by the horizontal flow from the nozzle 18. Only the heavy specific gravity A having a very high specific gravity of a metal such as iron, copper, lead or the like sinks into the discharge screw 11 as it is.
10 and FIG. 11, the numbers of the upflow generation pipes 8 and the suction pipes 9 are arbitrary.

FIGS. 12 and 13 show seventh and eighth embodiments, both of which are first and second modifications of the fifth embodiment shown in FIG. The configuration is such that two suction pipes 9 are provided 9 ₁ , 9 ₂ , and the embodiment of FIG. 13 is further provided with two upflow generation pipes 8, 8 ₁ , 8 ₂ . Suction force of both the suction pipe 9 _1, 9 ₂ a suction tube 9 ₁ on the upstream side and weaker than the suction pipe 9 ₂ downstream, both upflow generating tube 8 _1, 8 ₂ also increases the discharge force on the upstream side a flow generating tube ₈₁ by weaker than upflow generating tube ₈₂ on the downstream side, in the same manner as the embodiment of FIG. 10, the heavy density substance a, it is possible to perform the selection of a '. At this time, a heavy specific gravity was A, also A 'is sucked into the suction pipe 9 _1, 9 ₂ on stream, or is sucked directly in response to the suction force of the suction pipe 9 _1, 9 _2, subsidence due to the weight The force exceeds the buoyancy (suction force) due to suction, and sinks downward again.
Including the above embodiments, the shape of the inlet portion of the suction pipe 9 can be the embodiment shown in FIG. 14, and the inlet shape of the upward flow generating pipe 8 can be the same. Also in this embodiment, the number of the upflow generation pipes 8 and the suction pipes 9 is arbitrary.

In each of the above embodiments, the heavy specific gravity A may be sunk from the eyes of the inclined screen 6, and a member that is not in each embodiment can be appropriately employed in an embodiment that does not have the member. For example, the storage unit 14 can be appropriately employed in the embodiments of FIGS. 2, 4, and 6.
Each embodiment is a case of selecting a concrete aggregate as a building waste material. However, each of the above embodiments is also performed when separating and removing gravel from the above-mentioned wood chips for papermaking, or for selecting a shot at a clay shooting range. The form can be adopted, and the effect of high sorting accuracy can be obtained. In those cases, the number of the upflow generation pipes 8 and the suction pipes 9 and the presence or absence of the inclined screen 6 are appropriately set according to the target selection object. For example, in the case of a shot or the like, the number of the upward flow generation pipes 8 and the suction pipes 9 is sufficient because there is one target selection object.

Process drawing which shows the process in which the mixture thrown into the sorting apparatus of 1st Embodiment is fractionated from building waste material 1 is a longitudinal sectional view showing a sorting apparatus according to a first embodiment. Sectional view along line III-III in FIG. Longitudinal sectional view showing the second embodiment Longitudinal sectional view showing a third embodiment Longitudinal sectional view showing the fourth embodiment Longitudinal sectional view showing the fifth embodiment Longitudinal sectional view showing the sixth embodiment Plan view of FIG. Partially omitted longitudinal sectional view showing a first modification of the sixth embodiment Partially omitted vertical sectional view showing a second modification of the sixth embodiment Longitudinal sectional view showing the seventh embodiment Longitudinal sectional view showing the eighth embodiment Partial perspective view of an example of a suction tube

Explanation of symbols

A, A ′, A ″ Heavy specific gravity B Medium light specific gravity C Light specific gravity D Mixture 1 Wet sorting device 2 Water tank 2a Supply end 2b Discharge end 3 Basket 3a Supply end 3b Discharge end 4 Partition plate 5 Chute 6 Inclined screen 7 Vibration generating means 8, 8 ₁ , 8 ₂ .. Upflow generation tube 8 a Upflow generation tube opening 9, 9 ₁ , 9 ₂ .. Suction tube 9 a Suction tube opening 10 Conveyor 11, 11 a Discharge screw 11 b Discharge port 12 pump 13 filter 14 reservoir 15 discharge screw 15a opening 15b discharge port 16 weir 17 flexible cover 18 nozzle 21 crusher 22 sieve 23 magnetic separator 24 grinder 25 sieve

Claims (12)

The mixture (D) to be sorted is put into the water tank (2), and the heavy specific gravity (A) and the medium light specific gravity (B) in the mixture (D) that settles to the bottom of the water tank due to the specific gravity difference is sorted. In the sorting device (1),
The water tank (2), upflow generating tube to suspend the in light specific gravity thereof by generating an increased water flow due to discharge of the water (B) in water and (8), suspended in water at the elevated water flow A suction tube (9) for sucking the floating material upward from the downward opening (9a), and the suction force of the suction tube (9) is reduced even if the heavy gravity (A) enters the suction tube (9). A sorting device that is set to sink.   The suction flow rate of the suction pipe (9) is made slower than the flow speed of the upward flow so that the heavy specific gravity (A) sinks into the suction pipe (9) even if it enters the suction pipe (9). 2. The sorting apparatus according to 1.   The ascending flow generation pipe (8) has an opening area narrower than a flow cross-sectional area of an inlet portion of the suction pipe (9) sucking upward from the opening (9a) of the suction pipe (9), The sorting apparatus according to claim 2, wherein the suction flow rate of the suction pipe (9) is made slower than the flow rate of the flow.   The interior of the water tank (2) is partitioned into a plurality of rows by vertical partition plates (4), and the suction pipes (9) are provided in each of the partitioned rows, respectively. The sorting apparatus according to any one of the above.   The mixture (D) charged into the water tank (2) is sized, and the sized mixture (D) is separately charged into each of the partitioned rows. Item 5. The sorting device according to Item 4. A plurality of the suction pipes (9) are sequentially provided in the flow direction of the mixture (D), and the suction force of the suction pipes (9 ₁ , 9 ₂ ...) Is sequentially increased in the flow direction. 6. The sorting apparatus according to claim 1, wherein the sorting apparatus is strengthened.   The sorting apparatus according to any one of claims 4 to 6, wherein an upflow generation pipe (8) is provided for each suction pipe (9).   The sorting apparatus according to claim 7, wherein the upward flow of each upward flow generation pipe (8) is strengthened in order toward the flow direction of the mixture (D).   Each of the opening (8a, 9a) of the upflow generation pipe (8) and the suction pipe (9) has a long hole shape that is long in the transverse direction to the flow direction of the mixture (D). Item 9. The sorting apparatus according to any one of Items 1 to 8.   An inclined screen (6) having a lower end opened as a discharge end between the upflow generation pipe (8) and the suction pipe (9) in the water tank (2) toward the flow direction of the mixture (D). Inclined downward, and the mixture (D) is introduced into the upper end side of the inclined screen (6) so that the heavy specific gravity (A) sinks to the bottom of the water tank from the discharge end on the lower end side. The sorting apparatus according to claim 1, wherein the sorting apparatus is characterized.   11. The sorting apparatus according to claim 10, further comprising means for applying vibration to the inclined screen (6).   The sorting apparatus according to claim 11, wherein a storage part (14) for the charged mixture (D) is continuously provided on an upper end side of the inclined screen (6).

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