Sand washing device

Abstract

To provide a sand washing device that is able to reduce generation of sand dust.SOLUTION: A sand washing device includes: a sieve 10 that separates large-diameter contaminants from sand to be washed; a separation device 20 that separates silt sticking to the sand from which the contaminants have been separated; and a classifier 50 that classifies the sand. The separation device 20 includes: a water tank 21 that stores the sand and supplied water; a cyclone separation device 22 that swirlingly stirs and washes the sand and the water in the water tank 21. A water supply machine 54 disposed downstream of the classifier 50, a second sieve 53 that rinses the water-supplied sand, and a third sieve 55 that removes water from the rinsed sand are further provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sand washing device. [Background technology]

[0002] The sand at racetracks is washed once a year to reduce impurities and dust in the sand. One example of a sand washing device is shown in Patent Document 1. The washing device in Patent Document 1 is comprised of a mixer, a high-speed slurrying device, a slurry receiving tank, a slurry transfer pump, a settling tank, a discharge device, and a drainage tank. When washing sand using this washing device, a small amount of water is added to the contaminated sand to form moist sand that has been moistened to a loose paste-like consistency. The moist sand is sucked into the air-fuel mixture, where it forms a mixture with the sucked water and collides against the other end of the mixer. It then passes through a reducer with a built-in collision plate, becoming a slurry. The slurry is stored in a slurry receiving tank, and is simultaneously transferred from the slurry receiving tank by a slurry transfer pump and flows into a settling tank. Miscellaneous materials rise in the settling tank and are discharged from the top. Most of the sand in the slurry that passes through the settling tank settles and accumulates at the bottom of the settling tank, and is discharged into the discharge tank by a discharge device. In this way, washed sand is obtained. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-86921 A Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, there are cases where silt or clay adheres to the surface of the sand. It is difficult to remove the silt or clay adhered to the sand using conventional washing devices, and there is still room for improvement. At racetracks, silt and clay can peel off from the sand as horses run, generating dust. If dust is generated after a horse runs at a racetrack, it can impede the running of horses running behind. Furthermore, if dust reaches areas near the racetrack, it can cause complaints. For this reason, in recent years, there has been a demand to further suppress the generation of dust.

[0005] In view of the above-mentioned problems, an object of the present invention is to provide a sand washing device capable of reducing the generation of sand and dust. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a sand washing apparatus comprising a sieve for separating large-diameter impurities from the sand being washed, a separation device for separating silt adhering to the sand from which the impurities have been separated, and a classifier for classifying the sand, wherein the separation device has a water tank for storing the sand and supplied water, and a cyclone separation device for stirring and washing the sand and water in the water tank in a spiral shape. According to the sand washing device of the present invention, the silt and clay adhering to the sand can be removed by the cyclone separation device, thereby reducing the generation of dust and providing good quality sand for the racecourse.

[0007] In the sand washing apparatus of the present invention, it is preferable to further include a water supply machine arranged downstream of the classifier, a second sieve for rinsing the sand supplied with water, and a third sieve for dewatering the rinsed sand. With this configuration, the second sieve can further remove silt adhering to the sand, and the third sieve can dewater the sand.

[0008] In the sand washing apparatus of the present invention, the water tank preferably includes a first tank for storing the sand and the water, and a second tank for storing the water overflowing from the first tank and suspended solids. With this configuration, sand and silt with low specific gravity that have floated can be removed from the first tank.

[0009] Furthermore, in the sand washing apparatus of the present invention, it is preferable that a float is provided in the first storage tank, and water is supplied when the float goes down. With such a configuration, it is possible to suppress a decrease in the washing effect.

[0010] In the sand washing apparatus of the present invention, it is preferable that a second cyclone separator is provided downstream of the second storage tank. With this configuration, reusable fine sand can be separated from the discarded sand, thereby reducing industrial waste.

[0011] In the sand washing apparatus of the present invention, it is preferable that a collection tank for storing muddy water separated by the classifier is connected to the classifier, and the muddy water in the collection tank is drained into the second storage tank. With this configuration, it is possible to treat industrial waste after recovering usable fine sand.

[0012] Furthermore, in the sand washing apparatus of the present invention, it is preferable that the water tank is mounted on a frame and unitized, and the cyclone separator mounted on a separate frame and unitized is disposed above the unitized water tank. With such a configuration, the water tank and the cyclone separator can be easily transported and installed. Also, the sand washing apparatus can be easily constructed by adding the newly installed water tank and cyclone separator to the existing sand washing apparatus. Effect of the Invention

[0013] According to the sand washing device of the present invention, the generation of sand and dust can be reduced. [Brief description of the drawings]

[0014] [Figure 1] 1 is a configuration diagram showing a sand washing device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view showing a water tank of the sand washing apparatus according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sand washing device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a sand washing device for washing sand used in a horse racing track will be described as an example.

[0016] 1, the sand washing apparatus 1 according to this embodiment includes a first sieve 10, a separating device 20, and a classifier 50. The first sieve 10 separates large-diameter impurities from the sand being washed, and is composed of a horizontal vibrating sieve that generates horizontal and vertical diagonal movements using a motor and a vibrator to efficiently sift the raw materials on the sieve surface. The first sieve 10 is disposed at the top of the sand washing device 1. The first sieve 10 has a mesh size of, for example, 2 mm.

[0017] A raw sand hopper 11, a belt feeder 12, and a raw sand conveyor 13 are provided upstream of the first sieve 10. The raw sand hopper 11 is a section for inputting sand before cleaning carried in by a wheel loader (not shown) or the like, and guides the sand to the belt feeder 12. The raw sand hopper 11 is provided with an inverter for adjusting the amount of sand to be cleaned. The belt feeder 12 is a device that receives sand from the raw sand hopper 11 and supplies sand to the raw sand conveyor 13. The belt feeder 12 is equipped with a belt with a flat cross section and plates for preventing spillage arranged on both sides of the belt in the width direction. The raw sand conveyor 13 is a device that receives sand from the belt feeder 12 and conveys the sand onto the first sieve 10. The raw sand conveyor 13 uses a belt with a recess in the middle part in the width direction, and is arranged at an incline so that the downstream side is higher than the upstream side.

[0018] A water supply machine 14 is provided above the first sieve 10, and the sand is sieved through the first sieve 10 while being supplied with wash water. The miscellaneous materials separated through the first sieve 10 are discharged via a conveyor 15 provided downstream of the first sieve 10. The sand of 2 mm or less separated through the first sieve 10 is sent to a separation device 20 together with the wash water.

[0019] The separator 20 separates silt adhering to the sand from which the impurities have been separated, and includes a water tank 21 and a cyclone separator 22. As shown in FIG. 2, the water tank 21 separates sand according to its specific gravity, and includes a first storage tank 23, a second storage tank 24, and a third storage tank 25. The first storage tank 23 is a tank for storing the sand sent from the first sieve 10 and washing water (supplied water). In the first storage tank 23, sand with a high specific gravity sinks to the bottom, and sand with a low specific gravity floats. Hereinafter, sand with a low specific gravity may be referred to as "floating matter." The heavy sand that sinks to the bottom of the first storage tank 23 is sent to the cyclone separator 22 together with water via a cyclone pump 26. A float 28 is installed in the first storage tank 23, and when the float 28 falls below a predetermined height, water is supplied to raise the water level. By providing the float 28, the water level required to operate the cyclone pump 26 can be ensured. Since the second storage tank 24 and the third storage tank 25 are used in a sand disposal process separate from the sand washing process, the configurations of the second storage tank 24 and the third storage tank 25 will be described later.

[0020] Cyclone separator 22 is a device that stirs and washes the sand with a high specific gravity separated in water tank 21 in a spiral shape together with water, and is equipped with cyclone pump 26 and cyclone separator 34. Cyclone pump 26 is installed in first storage tank 23, and sucks in the sand with a high specific gravity and water, and sends them to cyclone separator 34 at high pressure.

[0021] The cyclone separator 34 has a cylindrical shape with a funnel-shaped lower end. The cyclone separator 34 is disposed above the water tank 21 and is detachably attached to the water tank 21. The cyclone separator 34 is separated from the water tank 21 during transportation. Sand and water are introduced into the cyclone separator 34 from the upper end of the side along the tangential direction of the inner circumferential surface, and rotated in a spiral shape inside. In the cyclone separator 34, the sand and water rotate in a spiral shape at high speed, so that the silt and clay attached to the sand are separated. Then, the sand is discharged from the lower end of the cyclone separator 34 together with the water, and the separated silt and clay are discharged from the upper end of the cyclone separator 34 together with the water. Hereinafter, the sand and water from which the silt and clay have been separated may be referred to as "treated water". The treated water discharged from the lower end of the cyclone separator 34 is sent to the classifier 50, and the silt, clay and water (hereinafter sometimes referred to as "mud") discharged from the upper end is sent to the second storage tank 24. The flow rate of sand and water supplied to the cyclone separator 34 is approximately 90 m 3 / h, and the flow rate of treated water discharged from the bottom is approximately 30m 3 / h, the flow rate of mud discharged from the top end is approximately 60m 3 It is set to / h.

[0022] The classifier 50 is a device that classifies sand in treated water. The classifier 50 rotates a spiral blade in a bucket filled with treated water to separate the treated water into sand and muddy water. A collection tank 51 is provided on the side of the classifier 50 where the muddy water is disposed. The muddy water is collected in the collection tank 51. The muddy water stored in the collection tank 51 is drained into the second storage tank 24 of the water tank 21 via a pump 52.

[0023] The sand is sent to a second sieve 53 provided downstream of the classifier 50. The second sieve 53 is a device for rinsing the sand. A water feeder 54 is provided above the second sieve 53. The water feeder 54 is a device for supplying water to the second sieve 53, and supplies water to the surface of the second sieve 53 from a shower nozzle. In the second sieve 53, the sand to which the water has been supplied is vibrated to rinse it, and a final sand washing is performed. This further removes impurities such as silt and clay that have been attached to the sand.

[0024] The rinsed sand is sent to a third sieve 55 located downstream of the second sieve 53. The third sieve 55 is a device for dewatering the sand. The third sieve 55 vibrates the sand to cause the water to fall and dewater it. This separates the washed sand from the water and completes the sand washing process. The washed sand is sent to a storage location via a washed sand conveyor 56.

[0025] Various components of the sand washing apparatus 1, such as the first sieve 10, the water tank 21, the cyclone separator 34, the classifier 50, etc., are fixed to frames large enough to be loaded onto a truck or the like, and the frames are assembled to construct the sand washing apparatus 1. When the sand washing apparatus 1 is to be transported, it is divided into frame units and transported by truck.

[0026] Next, the second storage tank 24 and the third storage tank 25 of the water tank 21 will be described. The second storage tank 24 is a tank that stores the water and suspended solids overflowing from the first storage tank 23, the mud separated by the cyclone separator 34, and the muddy water separated by the classifier 50. The second storage tank 24 is adjacent to the first storage tank 23 and is partitioned from the first storage tank 23 by a wall 27 of a predetermined height. When the water level in the first storage tank 23 exceeds the upper end of the wall 27, the overflowing water and suspended solids flow into the second storage tank 24.

[0027] The material stored in the second storage tank 24 (water, suspended matter, mud, and muddy water) is sent to the second cyclone separator 29. The second cyclone separator 29 is a device that stirs and washes the water and suspended matter in a spiral shape, and is equipped with a cyclone pump 30 and a second cyclone separator 31. The cyclone pump 30 is installed in the second storage tank 24, and sucks up the material and sends it to the second cyclone separator 31 at high pressure. The second cyclone separator 31 separates the material sent from the second storage tank 24 into fine sand with a particle size of 0.106 mm or less and sand with a particle size larger than that. The sand with a particle size of 0.106 mm or more is collected in a collection tank 32. The collected sand with a large particle size can be reused as general surplus soil or sand for concrete. The fine sand with a small particle size is sent to the third storage tank 25 and then sent to a dehydrated cake treatment.

[0028] The third storage tank 25 is a tank for temporarily storing the fine sand before processing into a dehydrated cake. The fine sand stored in the third storage tank 25 is sent to an industrial waste treatment device (not shown) via a pump 33. The industrial waste treatment device is a known device, and supplies chemicals and treatment water to the fine sand to filter and dehydrate it, forming a dehydrated cake. The dehydrated cake is treated as industrial waste. In the industrial waste treatment device, dehydration is performed using a filter press device, but since the sand with large particle size is removed by the second cyclone separator 25, the amount of sand to be treated is reduced and the treatment target is limited to fine sand with small particle size. This reduces wear on the filter of the filter press device and extends the life of the filter. Furthermore, the amount of dehydrated cake to be turned into industrial waste can be reduced.

[0029] According to the sand washing apparatus 1 of this embodiment, the cyclone separator 34 of the cyclone separator 22 can remove silt and clay adhering to the sand. In other words, while conventional sand washing apparatuses are not provided with a water tank or a cyclone separator, this embodiment is provided with a water tank 21 and a cyclone separator 22 to remove silt and clay adhering to the sand. This can significantly reduce the generation of sand dust, and significantly improve the functionality of the sand washing apparatus 1. Furthermore, the sand separated by the classifier 50 is rinsed on the second sieve 53 while water is being supplied, so that silt and clay adhering to the sand can be further removed. Furthermore, the sand is dehydrated on the third sieve 55, so that the washing of the sand can be completed in a state that is ready for shipment.

[0030] The water tank 21 is provided with a first storage tank 23 for storing sand and water, and a second storage tank 24 for storing water overflowing from the first storage tank 23 and floating matter, etc., so that floating matter such as sand and silt with low specific gravity that has floated from the first storage tank 23 can be removed.

[0031] A float 28 is installed in the first storage tank 23, and water is supplied when the water level in the first storage tank 23 drops and the float 28 drops, so that the cyclone pump 26 can be operated at all times and the desired amount of sand and water can be supplied to the cyclone separator 34. This makes it possible to prevent a decrease in the washing effect.

[0032] Incidentally, the JWWA standard established by the Japan Water Works Association stipulates that washed sand must have a temperature of 30 degrees or less to be suitable for use as filtration sand, but the sand washed with the sand washing device 1 of this embodiment had an average temperature of 8.6 degrees. With the sand washing device 1 of this embodiment, racecourse sand can be washed to the extent that it can be used to filter tap water, and it can be recycled as cushion sand at the racecourse with almost no dust. This prevents adverse effects on the horses and jockeys running behind in the race, and eliminates concerns about worsening the surrounding environment.

[0033] The second cyclone separator 29 provided downstream of the second storage tank 24 can separate reusable fine sand from the discarded sand, thereby reducing industrial waste.

[0034] In addition, the classifier 50 is connected to a recovery tank 51 for storing the muddy water separated by the classifier 50, and the muddy water in the recovery tank 51 is discharged into the second storage tank 24, so that after the usable fine sand is recovered, a dehydrated cake process can be performed.

[0035] Furthermore, in the sand washing apparatus 1, the water tank 21 is mounted on a frame and unitized, and the cyclone separator 22 mounted on a separate frame and unitized is disposed above the unitized water tank 21, so that the water tank 21 and the cyclone separator 22 can be easily transported and installed. Also, a sand washing apparatus can be easily constructed by adding the newly installed water tank and cyclone separator to a conventional sand washing apparatus.

[0036] Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and the design can be appropriately changed without departing from the spirit of the present invention. For example, the sand washing device 1 of the above embodiment is for washing sand at a horse racing track, but is not limited to this. Of course, sand other than that at a horse racing track can also be washed. [Explanation of symbols]

[0037] 1 Sand washing equipment 10 First sieve (sieve) 20 Separation device 21 Aquarium 22 Cyclone Separator 23 First storage tank 24 Second storage tank 28 Float 29 Second cyclone separator 34 Cyclone separator 50 classifier 51 Recovery tank 53 Second sieve 54 Water dispenser 55 Third sieve

Claims

1. a sieve for separating large particles from the sand being washed; A separation device for separating silt adhering to the sand from which the impurities have been separated; A classifier for classifying the sand, The separating device includes a water tank for storing the sand and the supplied water, and a cyclone separating device for stirring and cleaning the sand and water in the water tank in a spiral shape. A sand washing device characterized by:

2. The sand sieve further includes a water supplying machine arranged downstream of the classifier, a second sieve for rinsing the sand to which water has been supplied, and a third sieve for dewatering the rinsed sand.

2. The sand washing device according to claim 1 .

3. The water tank includes a first tank for storing the sand and the water, and a second tank for storing water overflowing from the first tank and suspended matter.

2. The sand washing device according to claim 1 .

4. A float is installed in the first storage tank, and water is supplied when the float goes down.

4. The sand washing device according to claim 3.

5. A second cyclone separator is provided downstream of the second storage tank.

4. The sand washing device according to claim 3.

6. A collection tank for storing the muddy water separated by the classifier is connected to the classifier, and the muddy water in the collection tank is drained into the second storage tank.

4. The sand washing device according to claim 3.

7. The water tank is mounted on a frame to form a unit. The cyclone separator, which is mounted on a separate frame and is also unitized, is disposed above the unitized water tank.

2. The sand washing device according to claim 1 .

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