JPS6357112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a washing device for sand, sieve residue, etc., which enables continuous processing of objects to be washed, increases crushing power and cleaning efficiency of objects to be washed, and significantly saves water. The present invention relates to a cleaning device for cleaning sediment, sieve residue, etc., which makes it possible to do this, and in particular, eliminates the need for large-scale means for carrying out items to be cleaned (screw conveyor, etc.) conventionally required.

In general, equipment that cleans sand, sieve residue, etc. scraped up from settling ponds at sewage treatment plants and pumping stations by stirring it in a cleaning tank while supplying cleaning water is, for example,
This is already known as seen in Special Publication No. 56-33144.

This is because the sediment, sieve residue, etc. are contaminated.
Since it is unhygienic to dispose of this directly in a landfill or the like, cleaning is being attempted as a pretreatment.

However, in the case of conventional equipment, since the cleaning process was carried out in one tank that was formed integrally, dirt adhering to sediment, sieve residue, etc. would be spread inside the tank and the cleaning water would be washed away. As a result, the unwashed items taken out of the tank were still unsanitary.

Furthermore, in order to improve the cleaning effect, the only way to improve the cleaning effect is to increase the amount of cleaning water supplied, which is uneconomical.

Furthermore, since the cleaning water is stirred in one large-capacity tank, the stirring power is weak, which causes the inconvenience that solid objects to be cleaned (such as human excrement) remain without being crushed. .

Therefore, in order to solve the above-mentioned problems, the present applicant filed an earlier application [Utility Application No. 58-26982 (Utility Model Application No.
135144)] proposed a new cleaning device.

This device forms a primary cleaning tank and a secondary cleaning tank as cleaning tanks, and uses the overflow water from the secondary cleaning tank as the primary cleaning water, resulting in significant water savings and The stirring power is also increased, which solves the above-mentioned problems to some extent.

However, since the above-mentioned apparatus is provided with only one primary cleaning tank, batch processing has to be carried out, and continuous operation is not possible, resulting in a decrease in the equipment operating rate.

For this reason, it is conceivable to form a plurality of primary cleaning tanks, but in this case there is a problem that the apparatus becomes larger.

In addition, by forming the primary cleaning tank and the secondary cleaning tank separately, the stirring power of the primary cleaning tank is temporarily increased, but the vortex formed by the stirring blades can cause the vinyl in the object to be cleaned to It has been found that there are cases in which such debris becomes entangled and becomes a large clump, and as a result, sufficient stirring and crushing power cannot be exerted.

Furthermore, in the above-mentioned example of the apparatus, it is necessary to provide a means for removing half of the object to be cleaned in order to carry out the object to be washed that has settled at the bottom of the tank out of the tank. The problem was that the equipment itself was large because it consisted of Yukon Bear and other equipment. In addition, in order to carry out the settled material to be washed (sand, etc.), the carrying-out means cannot be installed at a steep angle, and it is necessary to maintain an angle of inclination below a certain level, so the length of the cleaning device itself becomes long. This resulted in the inconvenience of not being able to utilize the land effectively.

Furthermore, the sliding noise generated by the rotating screw rubbing against the settled sand was noisy and became a source of noise pollution.

The present invention has focused on the problems as described above and has been devised to effectively solve the problems.

An object of the present invention is to divide a cleaning tank for cleaning objects to be cleaned into a primary cleaning tank and a secondary cleaning tank, and to divide the primary cleaning tank to separate the objects to be cleaned into primary cleaning and secondary cleaning tanks. In addition to washing, a centrifugal separator is used to transport and separate the objects to be washed (sand, etc.) that settle in the secondary washing tank, making it possible to continuously process the objects to be washed, and to remove the objects to be washed. Grits and sieves that increase the crushing power and cleaning efficiency of the washed material, also enable significant water savings, and in particular eliminate the need for large-scale means of transporting the washed material (screw conveyor, etc.) that were previously required. To provide a cleaning device for residue, etc.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in Figures 1 and 2, this cleaning device receives drainage or overflow water from the secondary cleaning tank 2 and uses this as cleaning water to clean the primary cleaning of sediment, sieve residue, etc. Mainly composed of a cleaning tank 1 and a secondary cleaning tank 2 connected to the cleaning tank 1, which performs secondary cleaning of primary washed sediment, sieve residue, etc. discharged from the primary cleaning tank 1 with fresh clear water. has been done. In the illustrated example, the primary cleaning tank 1 and the secondary cleaning tank 2 are separated by partitioning one side of one horizontally long tank body 3 with blades 4 . Therefore, by opening (rotating) the blade 4, which will be described later, the object to be cleaned in the primary cleaning tank 1 will be introduced into the secondary cleaning tank 2.

The primary cleaning tank 1 is formed as a semicircular tank whose horizontal cross section is approximately semicircular. At the center of this semicircular primary cleaning tank 1, that is, at the center of curvature of the semicircle, there is a rotating shaft 5 that stands up from the bottom of the tank body.
is provided. A plurality of blades 4 extending radially toward the inner wall 6 of the tank body are attached and fixed in the axial direction to the rotating shaft 5, and the inside of the primary cleaning tank 1 is divided into a plurality of parts. A plurality of fan-shaped cleaning sections 7 and transfer sections 71 are formed. In the illustrated example, the blade 4 has its center angle
A total of six cleaning units 7 are provided at intervals of 60 degrees, and therefore two to three divided cleaning units 7 are always formed.

A blade drive device 8 such as a motor is attached to the rotary shaft 5, and by driving the blade drive device 8 intermittently or continuously at a low speed, the blades 4 can be sequentially rotated in the directions indicated by the arrows. It's summery. Further, a sealing member 9 such as synthetic rubber is provided at the tip of each blade 4 along the vertical direction.
is attached, and a seal member 9 is attached, which moves while coming into sliding contact with the inner wall 6 as the blade 4 rotates. Incidentally, this sealing member 9 may also be provided at the lower end of the blade 4, whereby the objects to be cleaned can be discharged to the secondary cleaning tank side more reliably.

At the lower part of the inner wall 6, a vortex chamber 72 having stirring blades 10 for stirring the object to be cleaned to be put into the tank and performing primary cleaning communicates with the outer peripheral part of the cleaning section 7. That is, it is recessed outward in the radial direction of the inner wall 6. The stirring blade 10 is connected to a stirring blade driving device 11. In the illustrated example,
Although one unit is provided at the center of the arc-shaped tank wall, two or more units may be provided at a predetermined interval in the circumferential direction as shown in the imaginary line to increase the stirring force.

In addition, a drain port 13 having a bar screen 12 is formed in the upper part of the inner wall 6 to drain overflow water containing dirt from inside the tank, and a drainage device connected to this drain port 13 is formed to drain the overflow water. 14 to a sand settling pond or the like (not shown). A charging conveyor 15 is provided above the primary cleaning tank 1 for charging the materials to be cleaned, such as sand and sieve residue, into the tank.

On the other hand, inside the secondary cleaning tank 2, a floating matter transporting means 16 is provided for transporting floating matter (cleaning waste) having a light specific gravity such as sieve residue to the outside of the tank. This floating matter carrying out means 16 is carried out from the primary cleaning tank 1 to the secondary cleaning tank 2.
A screen 17 is arranged so as to be inclined upward along the direction of flow toward the tank and to block the flow, and a floating matter transport system is arranged along the screen 17 to transport floating matter captured by the screen 17 out of the tank. conveyor 1
It consists of 8.

The screen 17 is made of wire rods arranged in multiple strips along the longitudinal direction with gaps capable of trapping floating objects. Furthermore, the floating matter carrying-out conveyor 18 has a scraper 19 that moves between the wire rods in the longitudinal direction to scrape off the captured floating matter, and is driven by a carrying-out conveyor drive device 20 provided at the carrying-out end side. I'm starting to get it.

In addition, the bottom of the secondary cleaning tank 2 is connected to the primary cleaning tank 1.
It consists of a front bottom part 22 that is connected to a flat bottom wall 21 and slopes downward, and a rear bottom part 23 that slopes upward from the lowest part of the front bottom part 22 along the flow direction. carry-in end 16a of
are appropriately spaced upward from the front bottom portion 22.

The front bottom part 22 and the rear bottom part 23 are formed with a sufficient angle of inclination so that the sedimented matter to be washed is accumulated at the lowest part thereof.

A clear water supply nozzle 26 for supplying clear water for performing secondary washing is provided upstream of the floating matter transport means 16 in the secondary cleaning tank 2, and a clear water supply pipe 27 is connected to this. ing.

The tank body 3 is equipped with a feature of the present invention for separating the washing water containing the settled substances to be washed, which is extracted from the bottom bottom part 40 of the secondary cleaning tank 2, into the substances to be washed and the residual liquid. A centrifugal separator 41 is installed in parallel.
This centrifugal separator 41 may be a normal hydrosaclone or the like, and does not need to have any special specifications.

This centrifugal separator 41 and a suction nozzle 42 for the precipitated cleaning material provided at the lowermost end 40 of the secondary cleaning tank 2
A precipitated material to be cleaned transfer passage 43 is connected between the two, and a circulating pump 44 interposed therebetween can also pump the fluidized material to be washed. In addition, an object extraction valve 45 is interposed in the upstream transfer passage 43 of the circulation pump 44, and an object discharge valve 45 is provided in the transfer passage 43 between the circulation pump 44 and the centrifugal separator 41. 46 is interposed.

And, between the centrifugal separator 41 and the primary washing tank 1, there is a space for transferring the residual liquid separated by the centrifugal separator 41 to the washing section 7 of the primary washing tank 1 and using it as washing water. , a residual liquid transfer passage 47 is provided.

On the other hand, floating matter transporting means 16 in the secondary cleaning tank
A cleaning water suction nozzle 48 is provided on the downstream side of the tank, located slightly below the cleaning liquid level, for suctioning and discharging the cleaning liquid in the tank. A valve 50 is provided on the downstream side (circulation pump side) of the cleaning target extraction valve 45 in the sediment cleaning target transfer passage 43.
is connected to.

All or part of this extracted cleaning liquid is recirculated to the primary cleaning tank 1 to be used as primary cleaning water, or is circulated again into the secondary cleaning tank 2. In order to transfer this circulating cleaning water,
A first wash water circulation passage 51 and a second wash water circulation passage 52 are branched from the precipitated wash material transfer passage 43 between the circulation pump 44 and the wash object discharge valve 46. The first wash water circulation passage 51 has a first on-off valve 53 interposed therebetween, and is connected to a wash water supply port 55 provided on the inner wall 6 of the primary washing tank 1. After the second on-off valve 54 is opened in the middle of the passage 52, the second cleaning tank 2
The clear water supply nozzle 26 is introduced into the inner bottom.
It is connected to an injection nozzle 56 located at approximately the same location as the tank, so that cleaning liquid can be circulated and supplied into each tank. In the illustrated example, only one cleaning water supply port 55 is provided, but
The invention is not limited to this, and a plurality of blades may be provided, or they may be provided corresponding to the location of the stirring blades 10.
The cleaning efficiency may be improved.

In the figure, numerals 57 and 58 are conveyors disposed at the discharge end of the floating matter discharging means 16 and at the wash discharge port of the centrifugal separator 41, respectively, and 59 is a drain valve.

Next, the operation of the present invention configured as described above will be described.

First, clear water (technical water) is supplied as washing water to the secondary washing tank 2 from the clear water supply pipe 27, and along with this, relatively clean washing water is supplied from the washing liquid suction nozzle 48 provided on the downstream side of the tank. is sequentially sucked and flows through the cleaning water circulation passage 49. A part of this cleaning water is further forced into the second cleaning water circulation passage 52 by the circulation pump 44, and is again supplied into the tank by the injection nozzle 56 provided at the lower part of the secondary cleaning tank, and the remaining cleaning water is The water is force fed through the first wash water circulation passage 51 and supplied into the tank as wash water for the primary wash tank 1 .

Note that when only the cleaning water in the secondary cleaning tank 2 is circulated in this way, the precipitated cleaning material transfer passage 43
Needless to say, the object to be cleaned extraction valve 45 and the object to be cleaned discharge valve 46 which are provided are closed to prevent the sediment from flowing out.

On the other hand, in the primary cleaning tank 1, the blade 4 rotates intermittently or continuously at a low speed about the rotating shaft 5. As the blade 4 moves in the direction of the arrow, an appropriate amount of the object to be cleaned is fed from the feeding conveyor 15 into each of the divided cleaning sections 7, and the object to be washed is fed into the area formed by the stirring blades 10. The primary cleaning is performed by stirring with a vortex. When only one stirring blade 10 is provided as in the illustrated example, the inside of the cleaning section 7 on the rotational direction side of the blade is sequentially stirred, but as shown in the imaginary line, two stirring blades 10 are provided.
By providing a base, stirring can be performed twice.

In particular, by dividing the inside of the tank into multiple parts and reducing the amount of material to be washed at one time in the washing section 7, the stirring power and crushing power are increased, ensuring that solids (human excrement, etc.) are removed. It can be crushed and cleaning efficiency can be improved.

Then, by rotating the blade 4 by 60 degrees, the object to be cleaned in the next cleaning section 7 is agitated and washed by the stirring blade 10, and at the same time, the object to be cleaned in the next cleaning section 7, which has been cleaned, is stirred and washed.
The objects to be cleaned (including cleaning water) inside are transferred to the secondary cleaning tank 2. In other words, the cleaning section 7 that accommodates the objects to be cleaned that have been subjected to the primary cleaning is transferred to the transfer section 71. This transfer of the object to be cleaned is also performed by a jet stream from the stirring blade 10 or a jet stream from the cleaning water outlet 55.

By sequentially rotating the blades 4 in this manner, cleaning can be performed continuously in each cleaning section, and discharge to the secondary cleaning tank can also be performed quantitatively and continuously.

In addition, the vortex formed by the stirring blades 10 tends to curl and harden garbage such as vinyl, but since this vortex is periodically destroyed by the rotating blade 4, it is possible to prevent the formation of clumps of this garbage, and the stirring The cleaning effect can be further improved.

Furthermore, the overflow flow is discharged from the discharge port 13,
Although the water level in the tank is kept constant, there is a tendency for floating matter to be captured by the bar screen 12 provided therein and obstruct the flow of overflow water. However, since this trapped floating matter is scraped off by the sealing member 9 at the tip of the blade, the above-mentioned inconvenience does not occur.

On the other hand, by discharging the objects to be cleaned in the primary cleaning tank 1 to the secondary cleaning tank 2, the residual dirt in the objects to be cleaned is diffused, and the objects to be cleaned are divided into objects with a light specific gravity (floating objects) and objects with a heavy specific gravity (floating objects). sand, etc.). When discharging the object to be cleaned, clear water is supplied from the clear water supply nozzle 26, and cleaning water from the downstream side of the tank is circulated and supplied from the injection nozzle 56, thereby increasing the efficiency of cleaning by dispersing the remaining dirt. Can be done.

The sieve residue, etc., which has a light specific gravity, floats in the tank and moves in the discharge direction, is captured by the screen 17 of the suspended matter conveyance means 16, and is scraped off by the scraper 19 while being carried out of the tank by the suspended matter conveyor 18. is discharged to.

On the other hand, inorganic substances with heavy specific gravity (sand, etc.) are also washed secondarily by the washing water and settle to the front and rear bottoms 22 and 23 of the tank, and the settled objects to be washed slide down the bottoms of each tank. It will be deposited at the bottom of the tank.

Here, the first on-off valve 53 of the first wash water circulation passage 51, the second on-off valve 54 of the second wash water circulation passage 52, and the circulation source valve 50 of the wash water circulation passage 49.
are respectively closed to stop the flow of these flow paths, and the washed object extraction valve 45 and the washed object discharge valve 46 of the precipitated washed object transfer passage 43 are respectively opened to open these flow paths.

As a result, the precipitated material to be washed that has accumulated at the bottom of the tank is sucked into the precipitated material to be washed suction nozzle 42 together with the washing water, and after being transferred in a fluid state in the above-mentioned precipitated material to be washed transfer passage 43, it is centrifuged. Separator 41
be introduced within.

This fluid is separated into granular or solid objects to be cleaned and residual liquid using centrifugal force. Unlike the conventional method of simply scraping up sediment, this centrifugal separation method can reliably separate sand, etc., which has a heavy specific gravity, from sieve residue, etc., which has a light specific gravity. Sieve residue can be removed and the cleaning effect can be increased.

The separated object to be cleaned is discharged from the cleaning object outlet 60.
While being discharged from and conveyed by the conveyor 58,
The separated residual liquid is transferred to the cleaning section 7 via the residual liquid transfer passage 47, and is used for circulation as primary cleaning water.

In this way, since the objects to be cleaned to be cleaned in the secondary cleaning tank 2 are subjected to primary cleaning or pre-treatment cleaning in the primary cleaning tank 1, the cleaning effect can be improved, and moreover, the cleaning effect can be improved. A portion of the relatively clean wastewater from the secondary cleaning tank 2 and the remaining liquid separated by the centrifugal separator 41 are used as cleaning water, resulting in significant water savings. That is, although the waste water from the secondary cleaning tank 2 and the residual liquid obtained from the centrifugal separator 41 are slightly contaminated, they are used for the primary cleaning of heavily soiled items, so Things can be cleaned to a considerable extent in advance, 2
In the next cleaning, the cleaning water in the tank will not become extremely contaminated.

Therefore, since the cleaning water supplied into the primary cleaning tank 1 is also relatively clean, the synergistic effect of these can increase the cleaning effect and make it possible to save a large amount of water.

In addition, since the precipitated material to be washed is extracted in a fluid state, pumped by the circulation pump 44, and then separated into solid and liquid by the centrifugal separator 41, there is no need for a large-scale screw conveyor or the like that was previously required. No equipment required. In particular, due to its characteristics, this centrifugal separator can process a large amount of fluid even though it is small, and requires little installation space.

On the other hand, in the primary cleaning tank, the inside of the tank is divided into multiple parts by a blade, and two items to be cleaned are sequentially separated for each fixed amount.
Since the waste is transferred and discharged to the next washing tank, unlike the conventional batch processing method, continuous processing operation is possible, improving the equipment operating rate and processing a large amount of objects to be washed.

In addition, by dividing the primary cleaning tank into multiple parts as described above, the cleaning water is vigorously agitated, which not only increases the cleaning effect but also increases the crushing force, ensuring that solids (such as human excrement) are also crushed. be able to.

In the above embodiment, the same circulation pump 44 is used both for pumping the sedimented material to be cleaned and for pumping the cleaning water in the secondary cleaning tank, so these treatments cannot be performed at the same time. However, the precipitated cleaning target transfer passage 43 and the cleaning water circulation passages 49 and 5
1 and 52 are provided separately and a circulation pump is provided in each passage, the above-mentioned processing can be performed simultaneously and in parallel.

Further, in the above embodiment, when a plurality (two units) of the stirring blades 10 are provided as shown in the imaginary line in FIG. As shown in FIG. 1, one stirring blade driving device 11 may be provided, and the driving gear 61 and the driven gears 62, 62 connected to each stirring blade 10 may be rotated thereby to drive the stirring blade 10. Further, the number of stirring blades is appropriately increased or decreased depending on the processing capacity.

In summary, according to the present invention, the following excellent effects can be achieved.

(1) Sediment, sieve residue, etc. are first washed in divided primary washing tanks using the waste water from the secondary washing tank and the residual liquid obtained from the centrifuge, and then further washed in the secondary washing tank. Since the cleaning is performed next, not only the cleaning effect is increased, but also a large amount of water can be saved, so running costs can be lowered.

(2) A centrifuge is used to separate the items to be washed from the washing water (residual liquid), eliminating the need for large-scale screw conveyors, etc., which were previously required, reducing equipment costs and saving land. Effective utilization and prevention of noise pollution can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a cleaning device according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a partial plan view showing a modified example. In the figure, 1 is the primary cleaning tank, 2 is the secondary cleaning tank, and 4 is the primary cleaning tank.
41 is a blade, 41 is a centrifugal separator, and 72 is a vortex chamber.

Claims (1)

[Claims] 1. A primary cleaning tank that primarily cleans items to be cleaned, such as sediment and sieve residue, while supplying cleaning water; A secondary cleaning tank in which water is added to perform secondary cleaning to precipitate objects with heavy specific gravity, and the inside of the primary cleaning tank,
A blade that is divided into a cleaning section and a transfer section open to the secondary cleaning tank side, and is provided in communication with an outer peripheral portion of the cleaning section, and a blade for rotationally transferring the cleaning water containing the object to be cleaned; A vortex chamber having a stirring blade for stirring the inside of the washing section, and a vortex chamber for separating the washing water containing the precipitated material to be washed extracted from the bottom of the secondary washing tank into the material to be washed and the residual liquid. 1. A cleaning device for cleaning sediment, sieve residue, etc., comprising a centrifugal separator for transferring the residual liquid left over from the cleaning process to the cleaning section.