JPH09299826A - Method and apparatus for removing lightweight substance mixed into aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove foreign matters mixed into aggregate to be washed with water and separated in an aggregate production, including light weight substances which are lighter than the aggregate but heavier than water. SOLUTION: Aggregate 11 containing mixed lightweight substances 12 which was charged from a precipitation passage 4 the upper space of which is partitioned by an overflow trough 3 installed in the upper part into water of one end in a classification tank 1 and precipitated is mounted on a slanted conveyer 5 for aggregate transportation the tail part of which is positioned in water right under the passage 4 and the top part of which is positioned on the water surface and discharged outside the tank 1. In this process, a water curtain 6a is formed by pressurized water ejected from the first nozzle line 6 at a position close to the water surface to which the conveyer 5 comes to separate the substances 12 from the aggregate 11 to retain just under the water surface. The substances 12 are transferred into an outflow trough 8 the outflow opening 8b of which is opened to the overflow trough 3 by pressurized water ejected from the second nozzle line 7 which is positioned on the passage 4 side from the first nozzle line 6 by a flexible backflow preventing body 9a and flexible guide plates on both sides to be discharged outside the tank 1 through the trough 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aggregates that are washed and sorted in an aggregate production plant (grain size is mainly 5 to 25).
mm Light gravel or recycled aggregate, etc.) is not suitable as an aggregate, but it is a light substance mixed in the aggregate that can efficiently remove light substances that are foreign substances that mainly settle in water. And a device suitable for carrying out this method.

[0002]

2. Description of the Related Art As aggregates used for concrete in the civil engineering and construction industries, gravel having a particle size of 5 to 25 mm and recycled aggregates produced when a building is demolished are widely used. There is. Among such aggregates, the production of gravel
It is roughly divided into a method of crushing and selecting mountain rocks to make crushed stones, a method of collecting and selecting natural gravel and sand, and a method of selecting from excavated sediment flowing into dam lakes. It Most of the raw materials for natural gravel and sand have been collected from rivers, but from the viewpoint of river protection, collection is prohibited in most rivers today. Other than the sorting method, land gravel collected from the sedimentary layer of the old river bed and mountain gravel collected from the gravel layer of the mountain formed from the old river and the uplift of the seabed are the mainstream.

When collecting these natural gravel, various foreign substances unsuitable as aggregates due to their properties, such as debris of driftwood, roots of plant trees, pumice stone, and strips of plastic, are mixed due to the attributes of the collection site. I can't avoid doing it. Further, it is unavoidable to mix various foreign substances unsuitable as an aggregate due to its properties such as wood, plastics, and strips of sheets into the recycled aggregate generated when the building is demolished. If a material in which such foreign substances are mixed is used as an aggregate, the quality and strength of concrete will be deteriorated. Therefore, in recent years, aggregate production plants have begun to install a dust remover that removes these foreign substances in order to improve the quality of the aggregate. This method is based on the method of separating and removing buoyancy by using buoyancy with respect to water, and has a drawback that its removal efficiency is limited and that a light substance that is lighter than aggregate but sediments in water cannot be removed.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and is a foreign substance mixed in gravel, recycled aggregate, etc., which is lighter than the aggregate but sediments in water. An object of the present invention is to provide a method for removing light substances mixed in aggregates, which has a high removal efficiency and a function of removing light substances floating in water, and an apparatus suitable for carrying out this method.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the inventors of the present invention have found that an aggregate containing light substances is provided above and an overflow gutter is provided adjacently to the upper part of the aggregate. A slanted bone in which the light material and aggregates that have settled are put into the water at one end of the classification tank from the divided settling channel, the tail part is placed in the water immediately below the settling channel, and the top part is located on the water surface. When placed on a material carrying conveyor and discharged to the outside of the classification tank, a water curtain is formed by pressure water ejected from the first nozzle row at a position near the water surface of the aggregate carrying conveyor to create a light substance. Is separated from the aggregate and stays just below the water surface, and the outlet is opened to the overflow gutter by the pressure water ejected from the second nozzle row located on the settling path side from the first nozzle row. Drive it into the gutter, discharge it out of the classification tank through the overflow gutter. , Light material sinks in water not only lighter materials float on water is also had completed the investigation to the present invention that can be effectively removed from the aggregate.

If an outflow gutter provided with a movable bottom plate whose height can be adjusted between the inflow side and the outflow side or provided with a rotating member with a blade is used, It was also clarified that the discharge efficiency of light substances from the overflow weir to the overflow gutter can be further improved.

Further, in order to carry out the method of the present invention, the upper part is partitioned by a partition plate which is provided with an overflow gutter adjacent to the upper part, and a settling path into which an aggregate containing light substances is introduced is provided. The classification tank installed at one end and the tail part are located in the water immediately below the settling channel and the top part is located above the water surface, and the aggregate containing the precipitated light substances is placed on the top surface. On the surface of the aggregate carrying-out conveyor, and an inclined conveyor for carrying out the aggregate for carrying out to the top part and discharging it to the outside of the classification tank, and for ejecting pressured water at a position near the surface where the conveyor for carrying out the aggregate comes to the water surface. A first nozzle row for forming a water curtain, a second nozzle row for ejecting pressure water that pushes back the light substances separated from the aggregate by the water curtain and staying immediately below the water surface to the settling path side, and the outlet is It opens in the overflow gutter and the inflow port is in front An outflow gutter located above the aggregate unloading conveyor and below the water surface on the side of the settling path from a position where the aggregate unloading conveyor reaches the water surface, an inflow port of the outflow gutter, and the second nozzle row. Between the pressure water jetting position and the pressure water jetted from the second nozzle row to guide the light substance staying immediately below the water surface pushed back to the settling path side into the inflow port of the outflow gutter. It was also found that this can be easily carried out by using an apparatus provided with a backflow preventer and guide plates on both sides.

In the device for removing light substances mixed in the aggregate, the outflow gutter is provided with a movable bottom plate between the inlet side and the outlet side, the height of which can be adjusted to control the flow rate. Rotation with a blade that controls the flow velocity of water in the outflow gutter between the inlet side and the outlet side of the outflow gutter or forcibly moves the light substances in the outflow gutter to the outlet side. If a member is provided, the efficiency of removing light substances can be further improved, and the aggregate carrying-out conveyor may be any of a belt conveyor, a chain conveyor, and a net conveyor. It was also clarified that the efficiency of removing light substances can be further improved if the guide plate of (4) has flexibility.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for removing a light substance mixed in an aggregate according to the present invention and an apparatus of the present invention suitable for carrying out this method will be described in detail with reference to the drawings.
FIG. 1 shows an apparatus of the present invention suitable for carrying out the method of the present invention.
2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB of FIG. Is C in FIG.
FIG. 6 is a vertical cross-sectional explanatory view showing a main part of another embodiment of the device of the present invention.

In the drawing, 1 is a classification for removing the light substance 12 from an aggregate 11 made of gravel and recycled aggregate containing light substances 12 such as driftwood debris, plant roots, pumice, plastics and sheet strips. The tank 1 is provided with a settling path 4 at one end of which the aggregate 11 mixed with the light substance 12 is put and settles down. Adjacent to the upper part of the partition plate 2 is an overflow gutter 3 for overflowing the lighter substances 12 that are lighter than water and have floated in the settling path 4. At the lower part of the side wall of the classification tank 1, there are provided a hand hole, a drain valve, etc. for discharging and inspecting fine particles, earth and sand, etc. accumulated on the bottom of the classification tank 1, though not shown. There is.

The tail portion of 5 is in the water immediately below the sinking passage 4,
Further, the top part is an inclined aggregate carrying-out conveyor positioned above the water surface, and the aggregate 11 containing the light substance 12 that has settled in the settling path 4 is placed on the upper surface and transferred to the top part. The aggregate 11 from which the light substances 12 have been removed is discharged as a product aggregate to the outside of the classification tank 1.
The rotary shaft in the portion existing in the water directly below is attached to the classification tank 1 via a water sealing mechanism. The aggregate carrying-out conveyor may be a belt conveyor, a chain conveyor, or a net conveyor.

Reference numeral 6 denotes a first nozzle row for ejecting pressured water at a position near the aggregate carrying-out conveyor 5 to reach the water surface to form a water curtain 6a on the surface of the aggregate carrying-out conveyor 5, and 7 denotes this first nozzle row. A second nozzle row for ejecting pressure water 7a that pushes back the light substance 12 separated from the aggregate 11 and staying just below the water surface to the settling path 4 side by the water curtain 6a formed by the pressure water ejected from the nozzle row 6 Is. Therefore, this second nozzle row 7
Need only be positioned on the settling path 4 side of the first nozzle row 6, and may be provided in one nozzle tube as shown in the figure or in each of a plurality of nozzle tubes.

In FIG. 8, an outlet 8b is opened to the overflow gutter 3, an inlet 8a is above the aggregate carrying-out conveyor 5, and the settling path is from the position where the aggregate carrying-out conveyor 5 reaches the water surface. It is an outflow gutter located below the water surface on the 4th side,
Between the inflow port 8a side and the outflow port 8b side, it is preferable to provide a movable bottom plate 8c whose height can be adjusted so that the flow rate of water in the outflow gutter 8 can be controlled. It is not a static head imparting means like that, but is a dynamic means for controlling the flow velocity of water in the outflow gutter 8 or forcibly moving the light substance 12 in the outflow gutter 8 to the outflow port 8b side. A rotating member 8d with a blade 8e may be provided, and as the rotating member 8d with a blade 8e, a case where a blade is planted around a cylindrical body or a cylindrical body and a chain or belt is used. It does not matter whether the rotating member 8d that moves also has the blade 8e planted.

Reference numeral 9a designates an inlet 8a of the outflow gutter 8 and the second nozzle row 7
Pressure water 7a is discharged from the second nozzle row 7 toward the settling path 4 by the pressure water 7a ejected from the second nozzle row 7, and the outflow gutter 8
End of the outflow gutter 8 to guide it into the inlet 8a
A backflow preventer fixed to the bottom of 8a, 9b is also a light substance that is provided between the inflow port 8a of the outflow gutter 8 and the position where the pressurized water 7a is ejected from the second nozzle row 7 and stays immediately below the water surface.
In order to push 12 into the settling path 4 side by the pressure water 7a jetted from the second nozzle row 7 and guide them into the inflow port 8a of the outflow gutter 8, one end is on both side walls of the inflow port 8a of the outflow gutter 8. It is a fixed guide plate 9b. If the backflow preventer 9a and the guide plates 9b on both sides are flexible, the end of the backflow preventer 9a is placed on the aggregate carrying-out conveyor 5 and the ends of the guide plates 9b on both sides are classified. Since it can be operated in a state of being brought into contact with a side skirt 13 described later which is brought into contact with the side wall of 1, the pressure water 7a ejected from the second nozzle row 7 directly below the water surface pushed back to the settling passage 4 side. It is preferable that the retained light substance 12 is not guided into the inflow port 8a of the outflow gutter 8 and is not pushed back to the settling path 4 side.

Numeral 10 is an aggregate feeding device installed above the classification tank 1 in order to throw the aggregate 11 mixed with the light substance 12 into the settling path 4 of the classification tank 1, in which the light substance 12 is mixed. An aggregate carry-in conveyor 10a for supplying the aggregate 11
Light material 12 supplied from this aggregate carrying conveyor 10a
Hopper 10b for receiving aggregate 11 mixed with
It is composed of a feeder 10c for feeding the aggregate 11 mixed with the light substance 12 falling from the inside of the settling path 4 at the end of the classification tank 1, and a vibrator is installed as this feeder 10c and is provided by this vibrator. It is preferable that the aggregate 11 has a structure capable of uniformly leveling the aggregate 11 in the width direction by vibrating.

Reference numeral 13 is a fixed plate 13a fixed to the side wall of the classification tank 1 and an elastic material whose lower end is in contact with the upper surface of the aggregate carrying-out conveyor 5. The upper end is fixed to the fixed plate 13a. The side skirt composed of the abutting pieces 13b, the aggregates 11 and the light substances 12 placed on the aggregate carrying-out conveyor 5 and transferred are provided on both side edges of the aggregate carrying-out conveyor 5 and the classification tank 1. It is intended to prevent falling from the space between the side wall and the bottom of the classification tank 1.

Further, 14 is placed on the aggregate carrying-out conveyor 5, is transferred to the outside of the classification tank 1 and is attached to the discharged aggregate 11, and is taken out of the classification tank 1 and the overflow gutter 3 When the sum of the amount of overflowed water is larger than the sum of the amount of pressure water ejected from the first nozzle row 6 to form the water curtain 6a and the amount of pressure water 7a ejected from the second nozzle row 7, To keep the water level in the classification tank 1 constant, water is supplied to the classification tank 1, or when the water in the classification tank 1 becomes polluted, the polluted water is discharged from the drain valve to supply clean water. It is preferable that the water supply pipe 14 is installed above the settling path 4 so as not to disturb the flow of water in the classification tank 1.

The operation for carrying out the method of the present invention by the apparatus of the present invention having the above-mentioned structure will be described in detail below. First, the aggregate 11 such as gravel and regenerated aggregate collected from a sampling site mixed with various light substances 12 such as driftwood debris, plant roots, pumice, plastic and sheet strips, The aggregate is brought into the hopper 10b installed above the classifying tank 1 from the conveyor 10a for carrying in the aggregate, and from the hopper 10b, the feeder 10c, the settling path 4 at the end of the classifying tank 1, the classification tank 1
Put it in the water inside.

The aggregate 11 containing the light substance 12 charged into the settling path 4 of the classifying tank 1 gradually approaches the partition plate 2 at a position apart from the partition plate 2 in the settling path 4. Conveyor 5 for sloping aggregate with the tail set in the water directly below the settling path 4 and the top set on the water surface
It is placed on the top and transferred to the outside of the classification tank 1. When the aggregate carrying-out conveyor 5 moves from the water surface to the water surface, a large amount of water moved to the water surface together with the aggregate 11 causes the water surface to move. In the vicinity, there is a falling water flow, and many of the light substances 12 on the surface of the aggregate 11 flow down into the water by this flow,
Phenomenon in which the light substance 12 is retained by the upward flow due to the movement of the aggregate carrying-out conveyor 5 and the downward water flow flowing down from the air, and a part of the light substance 12 is discharged as product aggregate while remaining on the aggregate 11. Will occur.

Therefore, in the present invention, in order to eliminate this phenomenon, the surface of the aggregate carrying-out conveyor 5 is pressurized with the pressure water jetted from the first nozzle row 6 at a position near the surface where the aggregate carrying-out conveyor 5 reaches the water surface. A water curtain 6a is formed on the top to block entrainment of the light substance 12 in the aggregate 11 so that the light substance 12 is separated from the aggregate 11 and retained just below the water surface. The inlet 8a of the outflow gutter 8 in which the outlet 8b is opened to the overflow gutter 3 by the pressure water 7a ejected from the nozzle row 7.
The light substance 12 mixed in the aggregate 11 is removed by driving it inside and discharging it through the overflow gutter 3 to the outside of the classification tank 1.

At this time, since the light substance 12 lighter than water, which has floated up in the settling path 4 whose upper part is divided by the partition plate 2 of the classification tank 1, is overflowed to the overflow gutter 3, the aggregate carrying-out conveyor 5 Most of the light substances 12 that are heavier than water are retained below the water surface by the water curtain 6a made of the pressure water that is transferred by the first nozzle row 6 and is ejected from the first nozzle row 6.

Thus, the aggregates 11 from which the light substances 12 have been removed and which have been transferred onto the water surface by the aggregate conveying conveyor 5 are dropped to a predetermined position outside the classification tank 1 and accumulated as product aggregates.

In such an operation, the size of the aggregate 11 in which the light substance 12 is put into the sedimentation passage 4 is changed, or the first nozzle row is changed depending on the kind of the light substance 12 mixed. By adjusting the pressure and flow rate of the pressure water ejected from 6 and the pressure water and the flow rate of the pressure water 7a ejected from the second nozzle row 7, the light substance 12 can be more effectively removed. If a gutter 8 provided with a movable bottom plate 8c whose height can be adjusted between the inlet 8a side and the outlet 8d side, or with a rotating member 8d with a blade 8e is used, Since the size of the aggregate 11 in which the substance 12 is mixed can be changed or the type of the light substance 12 mixed in can be dealt with, the discharge efficiency of the light substance to the outflow gutter 8 can be further improved. is there.

[0024]

As described in detail above, the method and apparatus for removing the light substance mixed in the aggregate according to the present invention is provided with an overflow gutter adjacent to the aggregate in which the light substance is mixed. Put into the water in the classification tank from the settling passage that is divided by the partition plate above, and place the settled light substances and aggregates in the tail part in the water just below the settling passage and in the top part on the water surface. When the aggregate is carried out on the inclined conveyor for discharging aggregate and discharged to the outside of the classification tank, a water curtain is sprayed from the first nozzle row at a position where the conveyor for discharging aggregate is near the water surface. The light material is made to separate from the aggregate and stays just below the water surface, and the outlet is opened to the overflow gutter by the pressure water ejected from the second nozzle row located on the settling path side from the first nozzle row. Drive into the outflow gutter and pass through the overflow gutter to sort tank As compared with the conventional method of removing light substances using only buoyancy, it is not suitable as a light substance that is lighter than water, and is not suitable as an aggregate, for example, it contains sufficient water. Driftwood debris, plant roots, pumice stones, plastics and sheet debris, and other light substances that sink in water can be efficiently removed, and the light substances can be poured into water to remove the light substances, so the aggregates can be washed again. Therefore, it is possible to obtain an aggregate having a very high quality.

As the outflow gutter, one having a movable bottom plate capable of controlling the flow rate by adjusting the height between the inflow side and the outflow side is used, or a rotary member with a blade is provided. If you control the flow rate of water in the outflow gutter or force the light material in the outflow gutter to the outlet side, the size of the aggregate containing the light material may change. Since it is possible to deal with the type of the mixed light substance, there is also an advantage that the efficiency of removing the light substance becomes very high.

Further, the device for removing light substances mixed in the aggregate according to the present invention has a simple structure and thus can be manufactured inexpensively and easily, and also has the structure described in claims 5-8. By adding it, various excellent effects can be added.

The industrial value of the method and apparatus for removing the light substance mixed in the aggregate according to the present invention, which has such various effects, is very great.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view schematically showing one embodiment of an apparatus of the present invention suitable for carrying out the method of the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional explanatory view taken along the line AA in FIG.

4 is a cross-sectional view taken along the line BB in FIG.

5 is a cross-sectional view taken along the line CC in FIG.

FIG. 6 is a vertical cross-sectional explanatory view showing a main part of another embodiment of the device of the present invention.

[Explanation of symbols]

 1 Classification tank 2 Partition plate 3 Overflow gutter 4 Settling path 5 Conveyor for carrying out aggregates 6 First nozzle row 6a Water curtain 7 Second nozzle row 7a Pressure water 8 Outflow gutter 8a Inlet port 8b Outlet port 8c Movable bottom plate 8d Rotating member 8e Blade 9a Backflow preventer 9b Guide plate 10 Aggregate feeding device 10a Conveyor for introducing aggregate 10b Hopper 10c Feeder 11 Aggregate 12 Light material 13 Side skirt 13a Fixing plate 13b Contact piece 14 Water supply pipe

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[Procedure amendment]

[Submission date] February 4, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title: Method and apparatus for removing light substances mixed in aggregate

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aggregates that are washed and sorted in an aggregate production plant (particle size is mainly 5 to 2).
5mm gravel and recycled aggregates, etc.) are not suitable as aggregates but are mainly foreign substances that settle in water. And a device suitable for carrying out this method.

[0002]

2. Description of the Related Art As an aggregate used for concrete in the civil engineering and construction industries, the particle size is mainly 5 to 25 m.
Widely used are gravel of m and recycled aggregate generated when demolished buildings. Among such aggregates, gravel is produced by crushing and selecting mountain rocks to make crushed stones, collecting natural gravel and sands and selecting them, and inflowing sediments into dam lakes. It is roughly divided into the method of selecting from the excavated ones. Most of the raw materials for natural gravel and sand have been collected from rivers, but from the viewpoint of river protection, collection is prohibited in most rivers today. Other than the sorting method, land gravel collected from the sedimentary layer of the old river bed and mountain gravel collected from the gravel layer of the mountain formed from the old river and the uplift of the seabed are the mainstream.

When collecting these natural gravel, various foreign substances unsuitable as aggregates due to their properties, such as debris of driftwood, roots of plant trees, pumice stone, and strips of plastic, are mixed due to the attributes of the collection site. I can't avoid doing it. Further, it is unavoidable to mix various foreign substances unsuitable as an aggregate due to its properties such as wood, plastics, and strips of sheets into the recycled aggregate generated when the building is demolished. If a material in which such foreign substances are mixed is used as an aggregate, the quality and strength of concrete will be deteriorated. Therefore, in recent years, aggregate production plants have begun to install a dust remover that removes these foreign substances in order to improve the quality of the aggregate. This method is based on the method of separating and removing buoyancy by utilizing buoyancy with respect to water, and has a drawback that its removal efficiency is limited and that a light substance that is lighter than aggregate but sediments in water cannot be removed.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and is a foreign substance mixed in gravel, recycled aggregate, etc., which is lighter than the aggregate but sediments in water. An object of the present invention is to provide a method for removing light substances mixed in aggregates, which has a high removal efficiency and a function of removing light substances floating in water, and an apparatus suitable for carrying out this method.

[0005]

Means for Solving the Problems As a result of intensive research to solve the above-mentioned problems, the inventors of the present invention have found that an aggregate containing a light substance is removed from a settling passage defined above by an overflow gutter provided at the top. Pour into the water at one end of the classification tank, and settle the light substances and aggregates that have settled on the inclined conveyor for carrying out aggregates with the tail part in the water immediately below the sedimentation channel and the top part on the water surface. When it is placed and discharged to the outside of the classification tank, a water curtain is formed by pressure water jetted from the first nozzle row at a position near the aggregate carrying-out conveyor to reach the water surface to separate light substances from the aggregate. And the outlet of the outflow gutter, which has an outlet opening to the overflow gutter due to pressure water ejected from the second nozzle row positioned on the settling path side of the first nozzle row. It is provided between the second nozzle row and the position where the pressure water is jetted. If each of the flexible backflow preventer and the guide plates on both sides drive it into the inlet and discharge it through the overflow gutter to the outside of the classification tank, not only the light substances floating in the water but also the light substances sinking in the water are boned. The inventors have completed the present invention by investigating that they can be effectively removed from the material.

If an outflow gutter provided with a movable bottom plate whose height can be adjusted between the inflow side and the outflow side or provided with a rotating member with a blade is used, It was also clarified that the discharge efficiency of light substances from the overflow weir to the overflow gutter can be further improved.

Further, in order to carry out the method of the present invention, an upper part is defined by an overflow gutter provided at an upper part, and a settling path into which an aggregate containing a light substance is introduced is provided at one end. The classification tank and the tail part are located in the water immediately below the settling channel, and the top part is located on the water surface.The aggregate containing the light substances that have settled down is placed on the top surface and transferred to the top part. And an inclined conveyor for carrying out aggregate for discharging to the outside of the classification tank, and pressure water is jetted at a position near the conveyor for carrying out aggregate to reach the water surface to form a water curtain on the conveyor surface for carrying out aggregate. A first nozzle row, a second nozzle row for ejecting pressure water that separates light aggregates that are separated from the aggregate by the water curtain and stays just below the water surface to push back toward the settling path, and an outlet is opened in the overflow gutter. The guide inlet is the aggregate carrying-out container Outflow gutter located above the ya and below the water surface on the side of the settling road from the position where the aggregate carrying-out conveyor reaches the water surface, and the pressure water from the inflow port of the outflow gutter and the second nozzle row. A flexible material that is provided between the jetting position and guides a light substance staying just below the water surface pushed back to the settling path side by the pressure water jetted from the second nozzle row into the inflow port of the outflow gutter. It was also found that this can be easily carried out by using an apparatus provided with a backflow preventive body having the above-mentioned and the guide plates on both sides.

In the device for removing light substances mixed in the aggregate, the outflow gutter is provided with a movable bottom plate between the inlet side and the outlet side, the height of which can be adjusted to control the flow rate. Rotation with a blade that controls the flow velocity of water in the outflow gutter between the inlet side and the outlet side of the outflow gutter or forcibly moves the light substances in the outflow gutter to the outlet side. It was also clarified that the efficiency of removing light substances can be further improved if the members are provided, and that any of a belt conveyor, a chain conveyor, and a net conveyor may be used as the aggregate carrying-out conveyor.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for removing a light substance mixed in an aggregate according to the present invention and an apparatus of the present invention suitable for carrying out this method will be described in detail with reference to the drawings.
FIG. 1 shows an apparatus of the present invention suitable for carrying out the method of the present invention.
2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB of FIG. Is C in FIG.
FIG. 6 is a vertical cross-sectional explanatory view showing a main part of another embodiment of the device of the present invention.

In the drawing, 1 is a classification for removing the light substance 12 from an aggregate 11 made of gravel or recycled aggregate containing light substances 12 such as debris of driftwood, roots of plants, pumice, plastic or sheet strips. The tank 1 is provided with a settling path 4 at one end of which the aggregate 11 mixed with the light substance 12 is put and settles. The settling path 4 floats after being put. It is preferable that an upper part of the overflow gutter 3 is partitioned by an overflow gutter 3 that overflows the lighter substances 12 lighter than water, and that the overflow gutter 3 is provided with a partition plate 2 adjacent to the upper part thereof. At the lower part of the side wall of the classification tank 1, there are provided a hand hole, a drain valve, etc. for discharging and inspecting fine particles, earth and sand, etc. accumulated on the bottom of the classification tank 1, though not shown. There is.

The tail portion of 5 is in the water immediately below the sinking passage 4,
Further, the top part is an inclined aggregate carrying-out conveyor positioned above the water surface, and the aggregate 11 containing the light substance 12 that has settled in the settling path 4 is placed on the upper surface and transferred to the top part. The aggregate 11 from which the light substances 12 have been removed is discharged to the outside of the classification tank 1 as product aggregate.
The rotary shaft in the portion existing in the water immediately below the settling path 4 is attached to the classification tank 1 via a water sealing mechanism. The aggregate carrying-out conveyor 5 may be a belt conveyor, a chain conveyor, or a net conveyor.

Reference numeral 6 is a first nozzle row for ejecting pressure water at a position near the aggregate carrying-out conveyor 5 to reach the water surface to form a water curtain 6a on the surface of the aggregate carrying-out conveyor 5, and 7 is the first nozzle row. Pressure water 7 that pushes back the light substances 12 separated from the aggregate 11 and staying just below the water surface to the settling path 4 side by the water curtain 6a formed by the pressure water ejected from the nozzle row 6
It is a second nozzle row for ejecting a. Therefore, the second nozzle row 7 only needs to be positioned closer to the settling path 4 side than the first nozzle row 6, and even if it is provided in one nozzle tube as shown in the drawing, it is provided in each of a plurality of nozzle tubes. It may be provided.

In FIG. 8, an outflow port 8b is opened to the overflow gutter 3, an inflow port 8a is above the aggregate carrying-out conveyor 5, and the settling path is located from a position where the aggregate carrying-out conveyor 5 reaches the water surface. It is an outflow gutter located below the water surface on the 4th side, and its height is adjusted so that the flow rate of water in the outflow gutter 8 can be controlled between the inflow port 8a side and the outflow port 8b side. It is preferable that a movable bottom plate 8c is provided,
Instead of such a static head providing means, the flow velocity of water in the outflow gutter 8 is controlled, or the light substance 12 in the outflow gutter 8 is controlled.
A rotating member 8d with a blade 8e, which is a dynamic means for forcibly moving the blade 8e to the outlet 8b side, may be provided, and the rotating member 8d with a blade 8e may be provided around a cylindrical body or a cylindrical body. It may be either a case where a blade is erected and a case where a rotating member 8d such as a chain or a belt in which a blade 8e is erected is used.

Reference numeral 9a is provided between the inflow port 8a of the outflow gutter 8 and the position where the pressurized water 7a is ejected from the second nozzle row 7, and the light substance 12 staying just below the water surface is ejected from the second nozzle row 7. A backflow preventer whose one end is fixed to the bottom of the inflow port 8a of the outflow gutter 8 so as to be pushed back to the settling path 4 side by the pressurized water 7a and to be guided into the inflow port 8a of the outflow gutter 8.
Similarly, 9b is provided between the inflow port 8a of the outflow gutter 8 and the position where the pressurized water 7a is ejected from the second nozzle row 7, and the pressure of the light substance 12 staying just below the water surface is ejected from the second nozzle row 7. A guide plate 9b is fixed at one end to both side walls of the inflow port 8a of the outflow gutter 8 so as to be pushed back to the settling path 4 side by the water 7a and guided into the inflow port 8a of the outflow gutter 8. Since the backflow prevention member 9a and the guide plates 9b on both sides have flexibility, the end portion of the backflow prevention member 9a is placed on the aggregate carrying-out conveyor 5, and the end portions of the guide plates 9b on both sides are set. Since the operation can be performed in a state of being brought into contact with a side skirt 13 described later which is brought into contact with the side wall of the classification tank 1, the water surface pushed back to the settling passage 4 side by the pressure water 7a ejected from the second nozzle row 7. There is no phenomenon in which the light substance 12 staying immediately below is pushed back to the settling path 4 side without being guided into the inflow port 8a of the outflow gutter 8.

Reference numeral 10 denotes an aggregate feeding device installed above the classifying tank 1 in order to throw the aggregate 11 mixed with the light substance 12 into the settling path 4 of the classifying tank 1.
2. An aggregate carrying-in conveyor 10a for supplying the mixed aggregate 11 of 2 and a hopper 1 for receiving the aggregate 11 containing the light substance 12 supplied from the aggregate carrying-in conveyor 10a.
0b and the light substance 1 that has dropped from this hopper 10b
2 is a feeder 10c for feeding the mixed aggregate 11 of 2 into the settling path 4 at the end of the classification tank 1. As the feeder 10c, a vibrator is installed, and the aggregate 11 is generated by the vibration imparted by the vibrator. It is preferable that it has a structure capable of evenly leveling in the width direction.

Reference numeral 13 is a fixed plate 13a fixed to the side wall of the classification tank 1 and an elastic material whose lower end is in contact with the upper surface of the aggregate carrying-out conveyor 5, and its upper end is fixed to the fixed plate 13a. The side skirt composed of the abutting pieces 13b, and the aggregates 11 and the light substances 12 placed and transferred on the aggregate discharge conveyor 5 are provided on both side edges of the aggregate discharge conveyor 5 and the classification tank 1. It is intended to prevent falling from the space between the side wall and the bottom of the classification tank 1.

Further, 14 is placed on the aggregate carrying-out conveyor 5, is transferred to the outside of the classification tank 1 and adheres to the discharged aggregate 11 and is taken out of the classification tank 1 and the overflow gutter 3 When the sum of the amount of water overflowed is greater than the sum of the amount of pressure water ejected from the first nozzle row 6 to form the water curtain 6a and the amount of pressure water 7a ejected from the second nozzle row 7, To keep the water level in the classification tank 1 constant, water is supplied to the classification tank 1, or when the water in the classification tank 1 becomes polluted, the polluted water is discharged from the drain valve to supply clean water. It is preferable that the water supply pipe 14 is installed above the settling path 4 so as not to disturb the flow of water in the classification tank 1.

The operation for carrying out the method of the present invention by the apparatus of the present invention having the above-mentioned structure will be described in detail below. First, the aggregate 11 such as gravel or recycled aggregate collected from a sampling site mixed with various light substances 12 such as debris of driftwood, roots of plants, pumice, and pieces of plastics and sheets, The aggregate is conveyed from the conveyor 10a for carrying in the aggregate to the hopper 10b installed above the classification tank 1, and is fed into the water in the classification tank 1 from the hopper 10b, the feeder 10c, and the settling path 4 at the end of the classification tank 1. Excuse me.

The aggregate 11 mixed with the light substance 12 charged into the settling path 4 of the classification tank 1 is gradually separated from the overflow gutter 3 which partitions the settling path 4 into the overflow gutter 3. It is settled in a direction approaching downward, and the tail part is placed in the water immediately below the settling path 4 and is placed on an inclined aggregate carrying-out conveyor 5 with the top part positioned above the water surface and transferred to the outside of the classification tank 1. However, when this aggregate carrying-out conveyor 5 moves from underwater to above the water surface, a large amount of water that has moved above the water surface together with the aggregate 11 causes a spillage of water near the water surface, and the aggregate 11
Many of the light substances 12 placed on the surface of the water flow down into the water by this flow, but the light substances 12 can be retained by the upward flow due to the movement of the aggregate carrying-out conveyor 5 and the downward water flow flowing down from the air, A part of it remains discharged on the aggregate 11 as product aggregate.

Therefore, in the present invention, in order to eliminate this phenomenon, the surface of the aggregate carrying-out conveyor 5 is pressurized with the pressure water jetted from the first nozzle row 6 at a position near the surface where the aggregate carrying-out conveyor 5 reaches the water surface. Light material 1
2 is blocked from being entrained in the aggregate 11, and the light substance 12 is separated from the aggregate 11 and retained just below the water surface, and the retained light substance 12 is ejected from the second nozzle row 7 under pressure water 7a. Due to this, the outlet 8b is opened to the overflow gutter 3 and the inlet 8a of the outflow gutter 8 and the pressure water 7a from the second nozzle row 7 are provided.
By pushing back into the inflow port 8a by the backflow preventive body 9a and the guide plates 9b on both sides, which are respectively provided between the jetting position and the flexible position, and discharging it to the outside of the classification tank 1 through the overflow gutter 3, The light substance 12 mixed in the aggregate 11 is removed.

At this time, the light substance 12 which is lighter than water and has floated up in the settling path 4 which is defined above by the overflow gutter 3 of the classification tank 1 is immediately overflowed to the overflow gutter 3 so that it can be used for carrying out aggregates. Most of the light substances 12 that are heavier than water are retained only under the water surface by the water curtain 6a made of the pressure water that is transferred by the conveyor 5 and ejected from the first nozzle row 6.

In this way, the light material 12 is removed and the aggregate 11 is transferred to the surface of the water by the conveyor 5 for carrying out the aggregate.
Is dropped to a predetermined position outside the classification tank 1 and deposited as product aggregate.

In such an operation, the size of the aggregate 11 in which the light substance 12 is put into the sedimentation passage 4 is changed, or the kind of the light substance 12 mixed is changed.
By adjusting the pressure and flow rate of the pressure water ejected from the first nozzle row 6 and the pressure and flow rate of the pressure water 7a ejected from the second nozzle row 7, the light substance 12 can be removed more effectively. As an outflow gutter 8, there is a movable bottom plate 8 whose height can be adjusted between the inlet 8a side and the outlet 8d side.
If the one provided with c or the one provided with the rotating member 8d with the blade 8e is used, the size of the aggregate 11 in which the light substance 12 is mixed changes, or the light substance 12 mixed in is changed.
Therefore, it is possible to improve the discharge efficiency of the light substance to the outflow gutter 8 because it can be dealt with according to the type.

[0024]

As described above in detail, in the method and apparatus for removing the light substance mixed in the aggregate according to the present invention, the aggregate in which the light substance is mixed is defined above by the overflow gutter. On a conveyor for sloping aggregate, in which the light substances and aggregates that have settled into the water in the classification tank from the settling passage are placed in the water immediately below the settling passage and the top portion is located above the water surface. When it is placed on the table and discharged to the outside of the classification tank, a water curtain is created by the pressure water jetted from the first nozzle row at a position near the aggregate carrying-out conveyor to reach the water surface to separate light substances from the aggregate. And stayed just below the water surface, and the outlet of the outflow gutter whose outlet is open to the overflow gutter by the pressure water ejected from the second nozzle row located on the settling path side from the first nozzle row. It is provided between the second nozzle row and the position where the pressure water is jetted. Since each has a flexible backflow preventer and guide plates on both sides to drive it into the inflow port of the outflow gutter and discharge it through the overflow gutter to the outside of the classification tank, only conventional buoyancy is used. Compared with the removal method of light substances, not only light substances lighter than water, but also unsuitable as aggregates, such as driftwood strips containing sufficient water, plant roots, pumice stone, plastic and sheet strips, etc. Light substances sinking in water can be efficiently removed, and since the light substances are poured into water to remove the light substances, the aggregate is rewashed, so that it is possible to obtain an aggregate having a very high quality.

As the outflow gutter, one having a movable bottom plate capable of controlling the flow rate by adjusting the height between the inflow side and the outflow side is used, or a rotary member with a blade is provided. If you control the flow rate of water in the outflow gutter or force the light material in the outflow gutter to the outlet side, the size of the aggregate containing the light material may change. Since it is possible to deal with the type of the mixed light substance, there is also an advantage that the efficiency of removing the light substance becomes very high.

Further, the device for removing light substances mixed in the aggregate according to the present invention has a simple structure and thus can be manufactured inexpensively and easily, and also has the structure described in claims 5-8. By adding it, various excellent effects can be added.

The industrial value of the method and apparatus for removing the light substance mixed in the aggregate according to the present invention, which has such various effects, is very great.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view schematically showing one embodiment of an apparatus of the present invention suitable for carrying out the method of the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional explanatory view taken along the line AA in FIG.

4 is a cross-sectional view taken along the line BB in FIG.

5 is a cross-sectional view taken along the line CC in FIG.

FIG. 6 is a vertical cross-sectional explanatory view showing a main part of another embodiment of the device of the present invention.

[Explanation of Codes] 1 Classification tank 2 Partition plate 3 Overflow gutter 4 Sedimentation path 5 Aggregate unloading conveyor 6 First nozzle row 6a Water curtain 7 Second nozzle row 7a Pressure water 8 Outflow gutter 8a Inlet 8b Outlet 8c Movable bottom plate 8d Rotating member 8e Blade 9a Backflow preventer 9b Guide plate 10 Aggregate feeding device 10a Aggregate carry-in conveyor 10b Hopper 10c Feeder 11 Aggregate 12 Light material 13 Side skirt 13a Fixed plate 13b Contact piece 14 Water supply pipe ── ─────────────────────────────────────────────────── ─

[Procedure amendment]

[Submission date] February 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006] Then, the movable bottom plate which can adjust the height and that provided between the inlet side as the outflow gutter and the outlet side, the use of those with bladed rotary member, the outflow It was also clarified that the discharge efficiency of light substances from the weir to the overflow gutter can be further improved.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

In such an operation, the size of the aggregate 11 in which the light substance 12 is put into the sedimentation passage 4 is changed, or the kind of the light substance 12 mixed is changed.
By adjusting the pressure and flow rate of the pressure water ejected from the first nozzle row 6 and the pressure and flow rate of the pressure water 7a ejected from the second nozzle row 7, the light substance 12 can be removed more effectively. As an outflow gutter 8, there is a movable bottom plate 8 whose height can be adjusted between the inlet 8a side and the outlet 8d side.
those having a c and, if used after example Bei <br/> blade 8e with rotating member 8d, aggregates 1 to be mixed in the light substances 12
Since the size of 1 can be changed or the type of the light substance 12 mixed in can be dealt with, the efficiency of discharging the light substance to the outflow gutter 8 can be further improved.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

Further, the device for removing light substances mixed in the aggregate according to the present invention has a simple structure and thus can be manufactured inexpensively and easily, and also has the structure as described in claims 5 to 7. By adding it, various excellent effects can be added.

Claims (8)

[Claims] 1. A settling path (4) in which an aggregate (11) mixed with a light substance (12) is partitioned by a partition plate (2) having an overflow gutter (3) adjacent to the upper part of the aggregate (11). )) Into the water at one end of the classification tank (1), and the light substances (12) and aggregates (11) that have settled are put into the water directly below the settling path (4) and the top is brought to the water surface. When the aggregate conveyor (5) is placed on the inclined conveyor (5) for discharging aggregate and discharged to the outside of the classification tank (1), the aggregate conveyor (5) is placed at a position near the water surface. One nozzle row
The water curtain (6a) is made from the pressure water ejected from (6) to separate the light substance (12) from the aggregate (11) and retain it just below the water surface, and the sedimentation is performed from the first nozzle row (6). The outflow gutter in which the outlet (8b) is opened to the overflow gutter (3) by the pressure water (7a) ejected from the second nozzle row (7) located on the side of the path (4).
(8) A method for removing a light substance mixed in an aggregate, which is characterized in that it is driven into the inside and discharged through the overflow gutter (3) to the outside of the classification tank (1). 2. An outflow gutter (8) having a movable bottom plate (8) whose height can be adjusted between the inlet (8a) side and the outlet (8b) side.
The light substance mixed with the aggregate according to claim 1, wherein the flow rate of water in the outflow gutter (8) is controlled by adjusting the height of the movable bottom plate (8c) by using the one provided with c). How to remove. 3. An outflow gutter (8) comprising a rotary member (8d) with a blade (8e) provided between its inflow port (8a) side and outflow port (8b) side. A method for controlling the flow velocity of water in the outflow gutter (8) by rotating the rotating member (8d) or forcibly moving the light substance (12) in the outflow gutter (8) to the outlet (8b) side. The method for removing light substances mixed in the aggregate according to 1. 4. Settling in which an aggregate (11) containing a light substance (12) is thrown in, the upper part of which is defined by a partition plate (2) provided adjacent to the overflow gutter (3). A classification tank (1) having a channel (4) at one end, and a light substance that has settled because the tail part is located in the water immediately below the settling route (4) and the top part is located above the water surface ( An inclined aggregate carrying-out conveyor (5) for placing the aggregate (11) mixed with 12) on its upper surface and transferring it to the top part and discharging it to the outside of the classification tank (1), and the aggregate carrying-out Nozzle row (6) forming a water curtain (6a) on the aggregate carrying-out conveyor (5) surface by ejecting pressurized water near the water surface of the conveyor conveyor (5), and the water curtain (6
Light substance that is separated from aggregate (11) in a) and stays just below the water surface
The second nozzle row (7) for ejecting pressure water (7a) that pushes back (12) to the settling path (4) side, and the outlet (8b) are provided in the overflow gutter (3).
And the inflow port (8a) is open to
An outflow gutter (8) located above the (5) and below the water surface on the side of the settling path (4) from the position where the aggregate carrying-out conveyor (5) reaches the water surface, and the outflow gutter ( The pressure water (7a) ejected from the second nozzle row (7) is provided between the inlet (8a) of 8) and the pressure water (7a) ejection position from the second nozzle row (7). ), The backflow preventer (9a) and the guides on both sides for guiding the light substance (12) staying just below the water surface pushed back to the settling channel (4) side into the inflow port (8a) of the outflow gutter (8). A device for removing a light substance mixed in an aggregate, characterized by comprising a plate (9b). 5. The outflow gutter (8) has an inlet (8a) side and an outlet (8).
The device for removing a light substance mixed in the aggregate according to claim 4, further comprising a movable bottom plate (8c) whose height can be adjusted between the b) side. 6. The outlet (8a) side and the outlet (8b) of the outflow gutter (8).
Control the flow velocity of water in the outflow gutter (8) or force the light substance (12) in the outflow gutter (8) to the outlet (8b)
The device for removing a light substance mixed in an aggregate according to claim 4, further comprising a rotating member (8d) having a blade (8e) that is moved to the side. 7. The light material mixed with the aggregate according to any one of claims 4 to 6, wherein the aggregate carrying-out conveyor (5) is a belt conveyor, a chain conveyor or a net conveyor. Equipment to remove. 8. The light substance mixed in the aggregate according to claim 4, wherein the backflow preventer (9a) and the guide plates (9b) on both sides have flexibility. apparatus.