JPH09201547A - Method and apparatus for removing shell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely remove shells from sand by making the shells fall down from slender recessed parts formed on a carrying panel or from gaps between wires of a carrying body constituted with a plurality of wires and removing them thereby. SOLUTION: A plurality of inclined carrying bodies 60 for carrying and guiding sand 2 separated by means of a separating panel toward a sand receiving tray 41 are installed on the lower part of a sidewall 33 of a separating part 32. A carrying part 62 of each carrying body 60 is constituted of a number of longitudinal wires 61 arranged separately in the direction at right angles to the carrying direction and the separating distance of each longitudinal wire 61 is set a little smaller than the particle diameter of the carried and guided sand 2 in accordance with the particle diameter of the sand 2. The sand 2 guided to the carrying body 60 is guided into the carrying part 62 and is carried toward the sand receiving tray 41 and on its midway, remaining flat shells 3A fall down from each gap between longitudinal wires 61 on a shell receiving tray 51 and are approximately completely removed thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removing method and an removing apparatus for removing shells mixed with sand from sand collected in the sea or the like.

[0002]

2. Description of the Related Art Generally, the sand laid on a golf course and the sand mixed as an aggregate in the concrete of a concrete structure are those collected from the sea or river.

[0003]

By the way, a lawn is planted in a golf course, and it is known that a weakly acidic atmosphere (PH5.7 to 6.5) is suitable for this lawn.
However, the collected sand contains a large amount of fine shells (volume ratio 15-
25%), and when laying it on a golf course, the collected sand is used as it is, so the ingredients of the shell begin to melt in the long run, forming a strong alkaline atmosphere (PH 7.0 to 8.5),
It will adversely affect the lawn. In such a case, maintenance of the lawn must be performed while the golf course is closed.

Further, the sand used as an aggregate in the concrete of the concrete structure is washed only for desalination, and the sand containing a large amount of fine shells is still used as it is. Concrete becomes strongly alkaline, which causes strength problems.

In order to avoid the above problems, only the shells should be removed from the sand, but in reality such a technique is not provided. Therefore, an object of the present invention is to provide a shell removing device and a shell removing method that can solve the above problems.

[0006]

[Means for Solving the Problems] The means for solving the problems in the present invention is to dry the collected sand, blow a gas to the dried sand, and use the difference in specific gravity between the sand and the shells mixed with the sand to make the sand. It removes salt by washing the sand mixed with the shell, and it is sorted by particle size by a sieve, and the sand sorted by particle size is dried. It blows gas.

Further, a drying device for drying the collected sand, and a separating device for separating the sand and the shell by using a difference in specific gravity by blowing a gas to the sand dried by the drying device. And a desalting device for removing salt from the collected sand, and a sieve for selecting sand by particle size,
The separating device is provided with a separating device main body and a wind power generating device arranged on one side of the separating device main body, and the separating device main body is provided with
A discharge path for discharging the sand to the outside of the separation apparatus main body and a discharge path for discharging the shell to the outside of the separation apparatus main body are provided.

Further, an inclined carrier plate for carrying the sand separated from the shell by the separating device to the side of the container provided at a predetermined place is provided, and this carrier plate is used for removing the residual shell in the sand. An elongated concave portion is formed, and this concave portion is formed in the width direction in the middle of the conveying plate.

Further, a slanted carrier for transporting the sand separated from the shell by the separating device to the side of the container provided at a predetermined place is provided, and the carrier of the carrier removes the residual shell in the sand. In order to do so, it is composed of a plurality of wire rods that are separated in a direction perpendicular to the sand transport direction according to the particle size of the sand.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a shell removing device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. This is a method of collecting sand (eg, sea sand) collected in order to obtain sand suitable for a golf course. ) A first vibrating sieve 4 for removing the shell 3 from the 2 and for selecting the sand 2 mixed with the shell 3 with a mesh sieve having a predetermined diameter, and the first vibrating sieve 4
Desalination device which is connected to the conveyor via a conveyor device 6 such as a belt conveyor and cleans the sand 2 selected by the first vibrating screen 4 for desalination (for example, trommel is used).
5 is provided.

Further, the seeds of weeds which are connected to the desalting device 5 through the carrying device 6 and which are mixed in the sand 2 desalted by the desalting device 5 are incinerated, and the sand 2 is completely dried. A drying device (for example, a rotary kiln is used) 7 for removing the dust of the seeds incinerated by the drying device 7, and a connecting device 6 to the dust removing device 8 The second vibrating sieve 10 for further sorting the sand 2 from which the dust has been removed by the dust remover 8 according to the particle size, and air is blown to the sand 2 sorted by the second vibrating sieve 10 to blow the sand. A separating device for separating the sand 2 and the shell 3 by using the difference in specific gravity between the shell 2 and the shell 3 mixed therewith (
(For example, Karato or the like is used) 11 and this separating device 1
It is provided with saucers (an example of a storage container) 12A, 12B for receiving the sand 2 and the shell 3 separated from the shell 3 in 1.

Incidentally, as shown in FIG.
Is a separation device main body 14 having a hopper 13 at the top, a separation fan (an example of a wind power generation device) 15 that is rotatably internally supported by the separation device main body 14, and is disposed near the hopper 13. A separating motor 16 for driving the separating fan 15 and a separating motor 16 disposed in the middle of the flow path of the separating wind generated by the separating fan 15 and supported by the separating device body 14 so that the inclination angle can be adjusted. 1 separation plate
7, 17 and the sand 2 colliding with the separation plates 17 and 17 is connected to a lead-out path for leading out the sand 2 to the front side of the separation device body 14 and the sand 2 is placed on the saucer 12 arranged below the separation device body 14. A shell discharge port 19 formed on a side portion of the separation device main body 14 in communication with the guide passages 18, 18 for guiding and the discharge passage 14A provided on the upper inside of the separation device main body 14.
And

Next, a method of removing the shell 3 in the removing device 1 configured as described above will be described. First, the collected sand 2 is passed through a first vibrating screen 4 to a predetermined mesh screen, that is, a nominal size.
The sand 2 is sorted according to particle size by using a 5 mm sieve (hereinafter simply referred to as 5 mm sieve), and then the sand 2 that has passed through the 5 mm sieve is put into a desalting apparatus 5 to be desalted by washing, and this desalination is performed. The sand 2 desalted by the salt device 5 is conveyed to the drying device 7 to incinerate the seeds of the weeds mixed in the atmosphere of 300 to 400 ° C, and the sand 2 is in an absolutely dry state (specific dry weight 2.45 ~ 2.5), and then remove dust from incinerated seeds with the dust remover 8.

The sand 2 from which the dust has been removed by the dust remover 8 is used as the second vibrating screen 10, that is, 2.5, 1.7, 1.4, 1.2, 1.
Screen using 0, 0.8, 0.6, 0.4, 0.3 mm sieves. It should be noted that, out of the sand 2 selected by the second vibrating screen 10, the sand 2 remaining on the screen of 0.6 mm or more is introduced from the hopper 13 of the separating device 11 which is in operation at a constant rate. (For those that pass through a 0.4 mm sieve, it is used by mixing it with an appropriate amount of sand 2 that will remain above a 0.6 mm sieve due to the water permeability.) Then, due to the separation wind generated by the separation fan 15. , Only the sand 2 falls near the separating fan 15 and collides with the separating plates 17 and 17, and the receiving passages 12 from the discharge paths 18 and 18.
Fall to A. On the other hand, the shell 3 has a specific gravity smaller than that of the sand 2 even if the shell 3 has the same particle size as the sand 2. To fall.

The separation device 1 in this embodiment
In No. 1, two separation plates 17 and 17 and two outlets 18 and 18 are provided, but, for example, among the sand 2 retained on the 2.5 mm sieve, the lightest ones are collected in the tray 12 on the separation fan 15 side in order.

According to the experiment, the relationship between the particle size of the sand 2 and the wind force generated by the separating fan 15 was 9.2 m / S for the sand 2 retained on the 2.5 mm sieve and 1.7 mm for the sand 2. Sand 2
For 8.9 m / S, for sand 2 retained on a 1.2 mm sieve
By setting the rate to 8.8 m / S, the shell 3 could be removed with a probability of about 98% in any case.

As described above, according to the embodiment of the present invention, the sand 2 having the required particle size is obtained by the first vibrating sieve 4 and the second vibrating sieve 10, and the sand 2 is desalted by the desalination apparatus 5. Since the seeds of the weeds mixed with the sand 2 are incinerated by the drying device 7, no weeds are generated, and the sand 2 and the shell 3 are separated by the separating device 11, so that the sand 2 becomes an alkaline atmosphere. As a result, the sand 2 having the optimum conditions as the sand for the golf course and the golf course is obtained.

In particular, by blowing air of a predetermined wind power onto the sand 2 which has been dried, the sand 2 and the shell 3 are separated using water even if the sand 2 contains a large amount of the shell 3. If the sand 2 from which the shell 3 has been removed in this way can be separated more reliably than in the case of being used in a golf course, the life of the lawn can be maintained for a long time, and therefore maintenance of the lawn becomes extremely easy. Moreover, there is almost no need to leave the golf course for maintenance of the lawn. In addition, a large amount of sand 2 is required at the golf course.
It is easy to secure the quantity by using the sea sand 2 for.

Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3, the shell removing device according to the second embodiment of the present invention enlarges the separating device 30 in order to improve the capability of separating the sand 2 and the shell 3, and removes the shell 3. This is a further improvement in the rate.

That is, on one side of the separation device main body 31,
A large separation fan 15 that is rotated by the drive of the separation motor 16 is rotatably supported, and a sand supply hopper 13 is installed on one side of the separation device body 31 and the other side of the separation device body 31 is installed. The box-shaped separating part 32 is arranged in the box, the side wall 33 of the separating part 32 has a length L of, for example, 2 m, and the top plate 34 has a height H of, for example, 1.5 m.

As shown in FIG. 4, a collision wall 35 with which the shell 3 collides is formed at the other end of the separating portion 32. Below the collision wall 35, the shell 3 that has collided and dropped is received in the shell. A downwardly inclined shell chute 37 for guiding to 36 is attached.

Further, as shown in FIG. 5, the separation device main body 31
An inverted V-shaped distribution plate 38 for distributing the sand 2 to the both side walls 33 of the separation part 32 is arranged along the length of the separation part 32 at the bottom of the separation part 32. Separation plates 40 (three in the figure) are arranged, and the separation unit 3
On the lower part of the side wall 33 of 2, a conveyor plate 42 having an inclined U-shaped cross section is attached for guiding the sand 2 separated by the separator plate 40 toward a sand tray 41 arranged below the separator 32. ing.

The carrying section 43 of the carrying plate 42 is composed of a continuous body of first to third plate members 44, 45 and 46 of different sizes, and as shown in FIG. ，
The facing portion of 46 is a tapered surface, and as shown in FIG.
The inclination angle θ1 on the upstream side of the tapered surface is, for example, 45.
And the downstream side inclination angle θ2 is, for example, 25 °, and the conveying plate (first to third plate members 44, 45, 4) is formed.
6) The inclination angle θ3 of the conveying surface of 42 is 3 with respect to the horizontal plane.
The angle is set to 0 °.

Each of the plate members 44, 45, 46 as described above is
Two elongated drop holes (recesses) 50 are formed by adjoining each other at a predetermined interval δ (for example, 3 mm), and a separation width B between the drop holes 50 is set to, for example, 20 cm. It should be noted that the conveyance surface of the second plate member 45 is provided with a drop σ1 of about 2 mm with respect to the conveyance surface of the first plate member 44, and the conveyance surface of the third plate member 46 is compared with the conveyance surface of the second plate member 45. Is 2m
A drop σ2 of about m is provided.

Reference numeral 51 in the figure denotes a residual shell receiving pan installed below the dropping hole 50. In the above structure, the sand 2 mixed with the shell 3 is desalted in the same manner as in the first embodiment,
The seeds of the weeds are incinerated, brought into an absolutely dry state, the dust of the incinerated seeds is removed, and the sand 2 that has passed through the sieve is put into the hopper 13. Then, due to the separating wind generated by the separating fan 15, the shell 3 having a small specific gravity is blown away far away, colliding with the collision wall 35 and dropping, and the shell chute 37.
Guided by and collect in the saucer 36 for shells.

On the other hand, the sand 2 having a large specific gravity does not collide with the collision wall 35 at a comparatively close place, that is, the separation section 32.
It falls inside and is distributed to both side walls 33 side by the distribution plate 38, and due to the shape of the sand 2, it falls on the sand tray 41 so as to bounce on the transport surface of each transport plate 42.

By the way, in general, most of the shells 3 mixed with the collected sand 2 are finely crushed to have a flat shape. In such a shell 3, the wind force of the separating wind does not work well on the shell 3 depending on the direction of the separating wind (direction of the shell 3), and even if the specific gravity is small, it falls to a place as close as the sand 2 having a large specific gravity. Sometimes,
Such residual shell 3A is distributed along with the sand 2 to the distribution plate 3
It is sorted by 8 and guided to the side of the transport plate 42.

Here, the sand 2 guided to the transport plate 42 falls on the sand tray 41 as if it bounces on the transport surface as described above, but the residual shell 3A has a flat shape, so that the transport surface is Bounces very little and will slide down along the transport surface. Further, since the drop hole 50 is formed in the transport plate 42, the shell 3 slid down along the transport surface falls from the drop hole 50 to the shell tray 51. In addition, the sand 2 that collided with the tapered surface jumps up again,
It falls on the sand tray 41.

Therefore, even if the residual shell 3A is distributed by the distribution plate 38 and guided to the side of the transport plate 42, it can be prevented from falling into the sand tray 41, and the residual shell 3 from the sand 2 can be prevented.
A can be reliably removed.

In the separating device 30 having the above structure,
As a result of investigating the amount of the shell 3 contained in the sand 2 stored in the sand pan 41 with the wind force of 10 m / S with respect to the sand 2 retained on the 1.7 mm sieve, the residual rate was 0.01% (volume ratio), The shell 3 could be removed almost completely.

As described above, according to the second embodiment of the present invention, while the sand 2 is being transported to the sand tray 41, the transport plate 42 is used.
Since a drop hole 50 for removing the residual shell 3A is provided in the shell, the separating wind force does not work well on the shell 3 and even if the specific gravity is small, it falls to a place as close as the sand 2 having a large specific gravity. Even in the case of the above, the residual shell 3A can be surely removed.

The separating device 30 shown in the second embodiment has a structure suitable for the sand 2 retained on the 1.7 mm sieve, and has a tapered surface of the facing portion of each plate member 44, 45, 46. Inclination angle θ1 on the upstream side, inclination angle θ2 on the downstream side, inclination angle θ3 of the transport surface of the transport plate 42, width of each drop hole 50, that is, a predetermined interval δ between each plate member 44, 45, 46, drop hole 50. It is needless to say that the separation width B and the like between them may be set to a value suitable for each according to the difference in the grain size of the sand 2.

In the second embodiment of the present invention, the carrier plate 42 is provided in the separating part to remove the residual shell in one step, but the present invention is not limited to this, and the residual shell is still contained. The sand may be collected in a predetermined place, and the residual shells may be removed in another step using the carrier plate 42.

Next, a third embodiment of the present invention will be described with reference to FIGS. 8 to 10. This is to remove the residual shell 3A more reliably, and the side wall 33 of the separating portion 32. In the lower part, the sand 2 separated by the separation plate 40 is separated by the separation unit 3
A plurality of slanted carriers 60 are provided for guiding and guiding the sand toward the sand tray 41 arranged below 2, and the transporting portions 62 of the respective carriers 60 are separated from each other in a direction perpendicular to the transport direction. The vertical wire rods 61 are composed of a large number of aligned vertical wire rods 61, and the distance 63 between the vertical wire rods 61 is set according to the particle diameter of the sand 2. It is set small. The front and rear portions of each vertical wire 61 are held by a frame 65.

The preferable values of the grain size of the sand 2 and the distance 63 between the vertical wire rods 61 in the transporting portion 62 of the transporting body 60 used for transporting and guiding the sand 2 are shown below ( It is shown in Table 1).

[0036]

[Table 1]

In the middle of the transport section 62, each vertical wire rod 61 is
A horizontal wire 64 is provided at an appropriate position in order to secure the separation distance 63. The other configurations are similar to those of the second embodiment described above, and will be omitted.

According to this structure, the sand 2 guided to the carrier 60 is guided by the carrier unit 62 and carried toward the sand tray 41, as in the second embodiment. Then, in the middle of the process, the flat residual shell 3A falls from between the vertical wires 61 to the shell tray 51 and is almost completely removed.

According to the third embodiment of the present invention,
Since the sand 2 is smoothly transported by the large number of vertical wire rods 61, the transport amount can be increased as compared with the second embodiment, and thus the throughput of the sand 2 in the entire device can be increased and the separation can be performed. It is possible to improve the adaptability such that the device 30 can be further enlarged. In addition, in the third embodiment of the present invention, a vibrator (not shown) such as a vibrator is provided in the middle of the carrying section 62.
By installing and vibrating each vertical wire 61, the residual shell 3A can be more reliably removed.

The present invention is not limited to the above-mentioned respective embodiments, and in the above-mentioned respective embodiments, the case where the sand 2 from which the shell 3 is removed is used in the golf course is shown. For example, a reinforced concrete structure is used. It is also possible to use the sand 2 from which the shell 3 has been removed as the aggregate to be mixed with the concrete when the construction is performed.

In this case, when the sand 2 is sorted according to the particle size by using the 5 mm sieve of the first vibrating sieve 4 in each of the above-mentioned embodiments, the same process as that of the above-mentioned embodiment is applied to the remaining sand. After that, the shells 3 and seeds are removed and used as coarse aggregate, and the shells 3 that have passed through the 0.6 mm sieve of the second vibrating sieve 10 are similarly removed to be used as fine aggregate.

When the sand 2 is used as a building aggregate, the drying device 7 may be in a surface dry state. It is known that, among the aggregates, particularly fine aggregates have a great influence on the worker's bilility of concrete, but by using the fine aggregates from which the shell 3 is surely removed as described above, it is preferable. It is possible to obtain a concrete having excellent worker bilility and extremely few impurities, and by constructing a structure using such concrete, it is possible to provide a structure having sufficient strength for a long period of time. Then, if the sea sand 2 is used as an aggregate, it is easy to secure the quantity.

Further, in each of the above embodiments, the first vibrating screen 4 and the desalting device 5, the desalting device 5 and the drying device 7, and the drying device 7 are used.
The second vibrating screen 10 and the second vibrating screen 10 are connected by the carrying device 6, but the present invention is not limited to this, and they may be provided separately without being connected by the carrying device 6.

In each of the above-mentioned embodiments, the shell 3 is removed after selecting the sand 2 according to the particle size. However, the present invention is not limited to this, and the sand 2 is dried and then according to the particle size. The shell 3 may be removed with a predetermined wind force (for example, 10 to 20 m / S) before the selection.

In addition, in the second embodiment, the drop hole 50 as a recess is formed to have a width substantially equal to the width of the carrier plate 42. However, the present invention is not limited to this and, for example, FIG. As shown, a large number of elongated drop holes 50 may be formed on the carrier plate 42 in an orderly manner.

[0046]

As is apparent from the above description, according to the present invention, the elongated members formed on the carrier plate are conveyed while the sand separated from the shell by the separating device is transferred to the container side provided at a predetermined place. The shells can be reliably removed from the sand because they are removed from the concave portions or from the gaps between the wire rods of the carrier constituted by a plurality of wire rods.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a shell removal device showing a first embodiment of the present invention.

FIG. 2 is also an enlarged perspective view of the separation device.

FIG. 3 is an enlarged perspective view of a separation device showing a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of the same.

FIG. 5 is a transverse sectional view of the same.

FIG. 6 is an enlarged sectional view of a guide plate of the same.

FIG. 7 is an enlarged cross-sectional view of a portion where plate members face each other.

FIG. 8 is an enlarged perspective view of a separation device showing a third embodiment of the present invention.

FIG. 9 is likewise a partially enlarged view of the carrier.

FIG. 10 is a partial enlarged view of a carrier plate showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Removal device 2 Sand 3 Shell 4 4 First vibrating screen 5 Desalination device 6 Conveying device 7 Drying device 8 Dust remover 10 Second vibrating screen 11 Separation device 12A saucer 13 Hopper 14 Separation device main body 15 Separation fan 17 Separation plate 30 Separation device 31 Separation device body 32 Separation part 37 Shell chute 38 Distribution plate 41 Sand saucer 42 Conveyor plate 50 Drop hole 60 Conveyor 62 Conveyor 61 Vertical wire 63 Separation distance 64 of each vertical wire Horizontal wire

Claims (7)

[Claims] 1. A method for removing shells from sand mixed with the shells, which comprises drying the collected sand and blowing a gas to the dried sand to remove the sand and the shells mixed therewith. A method for removing a shell, comprising separating the sand and the shell using a difference in specific gravity. 2. The sand mixed with shells is washed to remove salt and also sorted by particle size by a sieve, and the sand sorted by particle size is dried and blown with a gas. How to remove the described shell. 3. A removing device for removing shells from sand mixed with the shells, which is a drying device for drying the collected sand, and a gas is blown to the sand dried by the drying device. This comprises a separating device for separating the sand and the shell by using the difference in specific gravity.
A separating device main body and a wind power generating device arranged on one side of the separating device main body are provided, and the separating device main body has a lead-out path for leading out sand to the outside of the separating device main body and a shell to the outside of the separating device main body. A device for removing shells, which is provided with a discharge path for discharging. 4. The shell removing device according to claim 3, further comprising a desalting device for removing salt from the collected sand, and a sieve for selecting the sand according to particle size. 5. An inclined transport plate for transporting the sand separated from the shell by the separating device to the side of the storage container provided at a predetermined location, and this transport plate is for removing the residual shell in the sand. The shell removing device according to claim 3, wherein an elongated concave portion is formed, and the concave portion is formed in the width direction in the middle of the conveying plate. 6. A slanted carrier for transporting the sand separated from the shell by the separator to a storage container provided at a predetermined location, and the carrier of the carrier removes residual shell in the sand. In order to do so, the shell removing device according to claim 3, comprising a plurality of wire rods spaced apart in a direction perpendicular to the sand transport direction according to the particle size of the sand. 7. The shell removing device according to claim 5, further comprising a desalting device for removing salt from the collected sand, and a sieve for selecting sand according to particle size. .