JPH08299843A - Sand classifying tank for spiral classifier - Google Patents

Abstract

PURPOSE: To control the outflow of sand even in a large amount of supplied water by constituting a sand classification tank which is installed to belong to the spiral tank of a spiral classifier by a funnel-shaped bottom part and a sand scraping device composed of a scraper which is rotated around a driving shaft along the bottom part. CONSTITUTION: When earth and sand of a raw material are fed from an inlet 36 into a sand classification tank 32 with washing water, the earth and sand are washed by supplied water to be precipitated gradually as first sand of a larger particle size and next sand of a smaller particle size, on a funnel-shaped bottom part 41. The precipitated sand, which is accumulated on the bottom part 41, is scraped off by scrapers 47, 47' which are attached to a driving shaft 49 rotated by a driving device 48 to be discharged from a sand outlet 51 into a spiral tank 38. Besides, after sand being precipitated, water overflows into a drain ditch 52 passing beyond a partition wall 43 to be discharged from a water discharge port 45. Sand which is introduced into a tank 34 is transferred by a spiral 35 to be discharged from a sand outlet 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand classification tank used as an accessory of a spiral classifier for selecting sand.

[0002]

2. Description of the Related Art Conventionally, a spiral classifier has been widely used in order to select sand having a desired particle size from collected earth and sand. This spiral classifier puts the collected earth and sand into a spiral tank, classifies it while adding water to wash and classify sand with a large particle size, and carries out only the selected sand with a carrier having a spiral shape. are doing. In order to collect even fine sand with a small particle size, it is necessary to increase the area of the spiral tank of the spiral classifier.To this end, the spiral shaft must be lengthened or the width of the spiral tank must be widened. It cannot be made too large due to the restriction of the place where the machine is installed, and the work of collecting fine sand cannot be performed efficiently by using a large amount of water.

Further, when the amount of water input is increased in order to improve the work efficiency, even fine sand having a useful particle size is not conveyed and is lost and cannot be recovered. . For this reason, a sand classification tank is often attached to a spiral classifier to store water for cleaning soil and settle and separate the sand that has diffused in the water. The inventor of the present invention has been disclosed in JP-A-59-37058 (JP-B-49-40068), JP-B-62-49106, JP-A-59-52545, and JP-A-59-66312 (JP-B-3. 22219), JP-A-59-66363.
No. 3 (Japanese Patent Publication No. 3-22218) proposed a sand classification tank used as an accessory of this spiral classifier.

FIG. 1 shows an example of a spiral classifier equipped with a sand classifying tank, which is described in the above-mentioned JP-A-59-37058. In this figure, 1 is a spiral classifier, and 2 is a sand classification tank. The spiral classifier 1 is composed of a box-shaped or semi-cylindrical spiral tank 4 having an inclined bottom portion 3 and a sand scraping spiral 5 provided along the inclined bottom portion 3 of the spiral tank 4. There is. An inlet 6 is provided at the uppermost position of the bottom of the inclined bottom 3 of the spiral tank 4 for supplying the classified sand and water for cleaning, and a sand outlet 7 is provided near the upper end of the bottom 3.
Is formed, and a side wall 8 whose upper end is slightly lower than the formation height of the sand discharge port 7 and whose upper part is horizontal is provided along the spiral 5. The rotating shaft 9 of the spiral 5 is rotationally driven by a power means such as a motor that is appropriately attached.

The sand classification tank 2 having a shallow box shape is provided at a position deviating from the position where the lowermost portion of the bottom portion 3 of the spiral tank 4 inclined at a height position substantially the same as the formation height of the sand discharge port 7. ing. The upper end of the side wall 10 of the sand classification tank 2 is continuous with the side wall of the spiral tank 4, and the plate-shaped bottom portion 11 has a bottom portion 3 of the spiral tank 4 via an inclined portion 12.
In succession. On the opposite side of the bottom part 11 of the sand classification tank 2 from the spiral tank 4, a partition wall 13 having an upper end slightly lower than the upper end of the side wall 10 of the sand classification tank 2 is provided upright. A water discharge port 15 is formed between the end wall 14 and the end wall 14. Endless belt 1 in sand classification tank 2
6 and the endless belt 16 is provided with a sand scraping device 18 including a scraping plate 17, and the sand scraping device 18 is provided.
Are driven by the drive unit 19. A partition plate 20 for partitioning the spiral classifier 1 and the sand classification tank 2 is provided between the spiral classifier 1 and the sand classification tank 2, and a sand discharge port 21 is provided between the partition plate 20 and the inclined portion 12. It is said that.

The earth and sand as a raw material is put into the spiral tank 4 of the spiral classifier 1 from the inlet 6 together with water for washing, and the earth and sand put in is washed with the introduced washing water to obtain sand having a large particle size. Precipitated and sorted. In this way, the selected sand is transported by the spiral 5 which is a transporting machine, and is discharged from the sand discharge port 7. At this time, the sand having a relatively large particle size is settled and conveyed, while the sand having a small particle size flows into the sand classification tank 2 together with water and settles on the bottom 11. The sand that has settled on the bottom 11 is driven by the drive unit 19 and the scraping plate 1 of the sand scraping device 18 is operated.
It is scraped out by the spiral classifier 1 by 7 and flows into the spiral tank 4 from the sand discharge port 21. The sand thus flowing into the spiral tank 4 is carried by the spiral 5 and discharged from the sand discharge port 7. Further, the water after the sand has settled over the partition wall 13 and overflows, and is discharged from the water discharge port 15.

[0007]

SUMMARY OF THE INVENTION In this sand classification tank 2, it is necessary to scrape out the sand that has settled on the bottom portion 11 by a scraping plate 17 of a sand scraping device 18, and the driving part of this sand scraping device 18 does not submerge in water. Since it is necessary to install the sand classification tank 2 at a position above the upper end of the side wall 10, the sand classification tank 2 cannot necessarily be deep. In order to settle the fine sand, the amount of water containing sand stored in the sand classification tank 2 may be increased, but if the area is not increased because the depth of the sand classification tank 2 is limited, the amount of water stored Cannot be increased.
However, if there is a restriction on the installation area of the entire spiral classifier 1 in which the sand classification tank 2 is combined, the area of the sand classification tank 2 that is continuous with the spiral tank cannot be increased. Therefore, when the amount of input water is large, the sand is often washed away, and these sands cannot be collected.

The present application solves the problem of the prior art in which the flow of sand is large and the sand cannot be recovered when the amount of input water is large, and the area of the sand classification tank, that is, the sand classification, is solved. Provided is an invention of a structure of a sand classification tank capable of increasing the amount of water containing sand to be stored without increasing the installation area of the entire spiral classifier in which the tanks are combined.

Therefore, the sand classification tank of the present invention has a deep structure unlike the conventional one, and the bottom is formed in a funnel shape instead of a flat shape. Further, the sand scraping device is not an endless belt in which a scraping plate is planted, but a scraping plate that rotates around a drive shaft along a funnel-shaped bottom.

The sand that has flowed into the sand classification tank having a deep structure together with water is precipitated during a long storage time, and the bottom end of the funnel-shaped bottom portion is rotated by a scraping plate which rotates around the drive shaft along the funnel-shaped bottom portion. From the sand scraping port formed nearby, it flows into the spiral tank 4 of the spiral classifier, is conveyed by the spiral, and is discharged from the sand discharging port.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 2 and 3 show a typical embodiment of the present invention. FIG. 2 is a side view and FIG. 3 is a plan view.
In this figure, 31 is a spiral classifier, and 32 is a sand classification tank. The sand classification tank 32 is provided at a position slightly apart from the lowermost position of the bottom portion 33 of the spiral tank 34 whose center is inclined, and the upper end has the same height as the side wall 38 of the spiral tank 34. The side wall 40 having a cylindrical shape or a rectangular tube shape, and the lower end of the side wall 40, which is formed continuously with the lower end thereof is disposed slightly above the lower end of the spiral 35, and the inclined surface of the spiral tank 34 has an inclined bottom portion 23.
That is, it is composed of a funnel-shaped bottom portion 41 having a cone shape or a pyramid shape having the same inclination angle as the spiral 35. Inside the side wall 40 of the bottom portion 41 of the sand classification tank 32, a partition wall 43 whose upper end is formed slightly lower than the upper end of the side wall 40 of the sand classification tank 32 is erected. The water discharge groove 52 is formed by the
A water discharge port 45 is formed at.

In the sand classification tank 32, the funnel-shaped bottom portion 4 is provided.
1 is provided with a sand scraping device 48 consisting of scraping plates 47, 47 'and a drive shaft 49 to which they are attached,
A drive shaft 49 of the sand scraping device 48 is rotated by the drive device 48. Further, a sand discharge port 51 communicating with the spiral tank 38 is formed in the lower portion of the bottom portion 41. Further, an input port 36 is provided on the sand classification tank 32 for inputting the raw material earth and sand and water for cleaning.

The spiral classifier 31 has an inclined bottom 33.
Box-shaped or semi-cylindrical spiral tank 34 having
And a spiral 35 for sand scraping, which is inclined along the inclined bottom portion 33 of the spiral tank 34. A sand discharge port 27 is formed near the upper end of the inclined bottom portion 33 of the spiral tank 34, and the side wall 38 along the spiral 35 is slightly lower than the formation height of the sand discharge port 37 and has a horizontal upper portion. Is erected. The rotating shaft 39 of the spiral 35 is rotationally driven by a power means such as a motor that is appropriately attached.

The operation of the exemplary embodiment shown in FIGS. 2 and 3 will now be described. The earth and sand as a raw material is introduced into the sand classification tank 32 through the inlet 36 together with water for cleaning. The introduced sand is washed with the introduced water, whereby the sand with a large particle size first and then the sand with a small particle size gradually precipitates on the funnel-shaped bottom portion 41. Settled sand on bottom 4
1 and is scraped out by the scraping plates 47, 47 ′ attached to the drive shaft 49 rotated by the driving device 48 and flows into the spiral tank 38 from the sand discharge port 51. On the other hand, the water after the sand has settled over the partition wall 43, overflows into the drain groove 52, and is discharged from the water discharge port 45. The sand thus flowing into the spiral tank 34 is conveyed by the spiral 35, and the sand discharge port 37
Emitted from.

As is apparent from the above description, the sand classification tank 32 of this embodiment shown in FIGS. 2 and 3 has a funnel-shaped bottom portion under the conventional sand classification tank 2 shown in FIG. The structure is further added. Therefore, sand classification tank 32
It is possible to increase the amount of water stored in the sand classification tank 32 without increasing the area of, and it is possible to sufficiently recover the sand even when the amount of input water is large. The inclination angle of the funnel-shaped bottom portion 41 is the same as that of the spiral shaft, and the lower end thereof is located slightly above the lower end of the spiral 35. Therefore, the spiral classifier is increased by attaching the sand classification tank 32. The installation area of is only half of the area of the sand classification tank 32.

FIG. 4 shows another embodiment in which the positions of the earth and sand and washing water inlets of the representative embodiment shown in FIGS. 2 and 3 are changed. In this figure, 31 is a spiral classifier, and 32 is a sand classification tank. The spiral classifier 31 is composed of a box-shaped or semi-cylindrical spiral tank 34 having an inclined bottom portion 33 and a sand scraping spiral 35 which is inclined along the inclined bottom portion 23 of the spiral tank 34. There is. An input port 36 'for inputting earth and sand to be classified and water for cleaning is provided at the top of the substantially central part of the spiral tank 34, and a sand outlet 37 is formed near the upper end of the bottom 33.
A side wall 38 is provided along the spiral 35, the upper end of which is slightly lower than the formation height of the sand discharge port 37 and the upper portion of which is horizontal. A sand discharge port 27 is formed near the upper end of the inclined bottom portion 33 of the spiral tank 34, and the side wall 38 along the spiral 35 is slightly lower than the formation height of the sand discharge port 37 and has a horizontal upper portion. Is erected. The rotating shaft 39 of the spiral 35 is rotationally driven by a power means such as a motor that is appropriately attached.

The sand classification tank 32 is provided at a position slightly apart from the lowermost position of the bottom portion 33 of the spiral tank 34 whose center is inclined, and its upper end is at the same height as the side wall 38 of the spiral tank 34. The side wall 40 having a cylindrical shape or a rectangular tube shape, and the lower end of the side wall 40, which is formed continuously with the lower end of the side wall 40, are arranged above the lower end of the spiral 35,
The inclined surface is composed of the inclined bottom portion 23 of the spiral tank 34, that is, a conical or pyramidal funnel-shaped bottom portion 41 having the same inclination angle as the spiral 35.
Scraping plate 47 along the bottom of the cone or pyramid shape,
Drive shaft 4 to which 47 'and scraping plates 47, 47' are attached
A sand scraping device 48 composed of 9 is provided. Inside the side wall 40 of the bottom portion 41 of the sand classification tank 32, a partition wall 43 whose upper end is formed slightly lower than the upper end of the side wall 40 of the sand classification tank 32 is erected. The water discharge groove 52 is formed by the
A water discharge port 45 is formed at.

In the sand classification tank 32, the funnel-shaped bottom portion 4 is provided.
1 is provided with a sand scraping device 48 consisting of scraping plates 47, 47 'and a drive shaft 49 to which they are attached,
A drive shaft 49 of the sand scraping device 48 is rotated by the drive device 48. Further, a sand discharge port 51 communicating with the spiral tank 38 is formed in the lower portion of the bottom portion 41.

The earth and sand as a raw material is put into the spiral tank 34 of the spiral classifier 31 through the inlet 36 'together with water for washing, and the earth and sand introduced are washed by the introduced washing water, and the sand having a large particle size is used. Are precipitated and selected. In this way, the selected sand is transported by the spiral 35 which is a transporting machine and discharged from the sand discharge port 37. At this time, sand having a relatively large particle size is precipitated and transported, while sand having a small particle size flows into the sand classification tank 32 together with water.

From the water that has flowed into the sand classification tank 32, the sand gradually precipitates on the funnel-shaped bottom portion 41, and the precipitated sand is driven by the drive unit 4.
It is scraped out by the scraping plates 47, 47 ′ attached to the drive shaft 49 rotated by 8, and flows into the spiral tank 38 from the sand discharge port 51. On the other hand, the water after the sand has settled over the partition wall 43, overflows into the drain groove 52, and is discharged from the water discharge port 45. The sand thus flowing into the spiral tank 34 is conveyed by the spiral 35 and discharged from the sand discharge port 37.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional spiral classifier equipped with a sand classification tank.

FIG. 2 is a cross-sectional view of a spiral classifier according to an embodiment of the present invention provided with a sand classification tank attached thereto.

FIG. 3 is a plan view of the conventional spiral classifier shown in FIG.

FIG. 4 is a sectional view of a spiral classifier according to another embodiment of the present invention, which is provided with a sand classifying tank.

[Explanation of symbols]

 1,31 Spiral classifier 2,32 Sand classifier 3,33 Spiral tank bottom 4,34 Spiral tank 5,35 Spiral 6,36,36 'Input port 17,47,47' Scratch plate 8,38 Spiral tank side wall 9 3.9 Spiral drive shaft 10,40 Sand classification tank side wall 11,41 Sand classification tank bottom 13,43 Partition wall 15,45 Water discharge port 18,48 Sand scraping device 19,49 Sand scraping device drive shaft 52 Water discharging groove

Claims (1)

[Claims] 1. A sand classification tank provided in association with a spiral tank of a spiral classifier, wherein the sand classification tank rotates around a drive shaft along a funnel-shaped bottom and a funnel-shaped bottom. A sand classification tank of a spiral classifier composed of a sand scraping device consisting of a scraping plate.