JPS59228952A - Washing device for settled sand, screen residue or the like - Google Patents

Abstract

PURPOSE:To improve washing efficiency by constructing a primary washing tank and a secondary washing tank in series and dividing the primary washing tank into plural sections with blades. CONSTITUTION:A washing device comprises a primary washing tank 1 wherein settled sands, etc. are washed primarily with the waste water from a secondary washing tank 2 and a secondary washing tank 2 constructed in series to the primary washing tank 1, wherein the settled sands, etc. washed primarily and discharged from the primary washing tank 1 are washed secondarily with fresh clean water. A rotary shaft 5 is provided to the center of curvature of the primary washing tank 1 being raised from the bottom of the tank. Plural numbers of blade 4... extended radially toward the inside wall 6 of the primary washing tank 1 are attached to the rotary shaft 5 in the axial direction and fixed, which divide the inside of the tank 1 into plural sections to form sectorial washing sections 7. Further, a driving device 8 for the blades are provided to the roatary shaft 5 which is driven at low revolution per minute to rotate and move the blades.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides sand settling, 1! Regarding cleaning equipment such as i-residue, especially 1
The interior of the secondary cleaning tank is divided into multiple parts to perform primary cleaning continuously, and this cleaning water is transferred to the secondary cleaning tank in fixed amounts in order, thereby making it possible to continuously process the objects to be cleaned. The present invention relates to a cleaning device for cleaning sand, sieve residue, etc., which increases the crushing power and cleaning efficiency of the objects to be cleaned, and furthermore enables significant water savings.

In general, there is a device that cleans the sand, sieve residue, etc. scraped up from the settling basins of sewage treatment plants and pumping stations by stirring it in a cleaning tank while supplying cleaning water.
As seen in the issue, it is already known.

This is because the sediment, II residue, etc. are contaminated, and it is unhygienic to dispose of them directly in a landfill, etc., so cleaning is attempted as a pretreatment.

However, in conventional apparatuses, the cleaning process is carried out in one integrally formed tank.
Dirt adhering to sand, sieve residue, etc. diffuses into the tank and contaminates the washing water, so that the objects to be cleaned discharged from the tank are still unhygienic. Furthermore, in order to improve the cleaning effect, the only way to improve the cleaning effect was to increase the amount of cleaning water supplied, which was uneconomical.

Furthermore, because the cleaning water is stirred in one large-capacity tank, the stirring power is weak, and solid objects to be cleaned (man-made disasters, etc.) remain unbroken.

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

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 has only one primary cleaning tank, batch processing has to be carried out, and continuous operation is not possible, resulting in a decrease in equipment utilization.

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 removes vinyl, etc. in the objects to be cleaned. It has been found that the dust gets caught up and forms a large lump, and as a result, sufficient stirring and crushing power cannot be exerted in some cases.

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

It is an object of the present invention to form a primary cleaning tank and a secondary cleaning tank in series, and to divide the inside of the primary cleaning tank into a plurality of parts by rotating blades so that each of the secondary cleaning tanks is A sand settling system that transfers the washing water containing the objects to be washed to, thereby making it possible to continuously process the objects to be washed, increasing the crushing power and cleaning efficiency of the objects to be washed, and furthermore, making it possible to save a large amount of water. ,
To provide a cleaning device for sieve 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 has two
A primary cleaning tank 1 receives drainage or overflow water from the secondary cleaning tank 2 and uses this as cleaning water for primary cleaning of sediment, sieve residue, etc., and is connected to this and discharged from the primary cleaning tank 1. The primary washed sediment.

It mainly consists of a secondary cleaning tank 2 for secondary cleaning of sieve residue etc. with fresh clear water. In the illustrated example, one side of one horizontally long tank body 3 is a blade 4 which is a feature of the present invention.
・The above primary cleaning tank 1 and secondary cleaning tank 2 can be separated by
are separated. Therefore, as will be described later, by opening (rotating) this blade 4, the objects 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. This semicircular primary cleaning tank 1
A rotating shaft 5 is provided at the center of the tank body, that is, at the center of curvature of the semicircle, standing up from the bottom of the tank body. and,
A plurality of blades 4 extending radially toward the inner wall 6 of the tank body are axially fixed to the rotating shaft 5, and the inside of the primary cleaning tank 1 is divided into a plurality of blades. A plurality of fan-shaped cleaning sections 7 are formed by dividing. In the illustrated example,
A total of six blades 4 are provided with their center angles spaced apart by 60 degrees, and therefore two to three divided cleaning sections 7 are always formed.

The rotary shaft 5 is provided with a blade drive device 8 such as a motor, and by intermittently or continuously driving the blade drive device 8 at a low speed, the blades 4 can be sequentially rotated in the direction of the arrow. ing. Further, a seal member 9 such as synthetic rubber is attached to the tip of each blade 4 along the vertical direction, and as the blade 4 rotates, this member moves while slidingly contacting the inner wall 6.

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.

In the lower part of the inner wall 6, there is provided a stirring m10 recessed outward in the radial direction of the tank body for stirring the object to be cleaned to be put into the tank for primary cleaning. is connected to the stirring blade drive device 11. In the illustrated example, one unit is installed at the center of the arc-shaped tank wall, but in order to increase the stirring power, it is possible to install 2M or more at a predetermined interval in the circumferential direction as shown by the imaginary line. You can also do this.

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). Above this primary cleaning tank 1 is settled sand, which is the object to be cleaned.

A charging conveyor 15 is provided for charging sieve residue and the like into the tank.

On the other hand, in the secondary cleaning tank 2 there are floating substances with a light specific gravity such as sieve residue (
Floating material transport means 16 for transporting cleaning waste) out of the tank
is provided. This suspended matter carrying out means 16 is inclined upward along the flow direction from the primary cleaning tank 1 to the secondary cleaning tank 2, and is provided with a screen 1 disposed to block this flow.
7 and a floating matter carrying-out conveyor 1 disposed in order to carry out the floating matter caught on the screen 17 out of the tank.
It consists of 8.

The screen 17 is made up of wire rods arranged in multiple strips along the longitudinal direction with gaps capable of trapping floating objects. Furthermore, the floating matter carry-out conveyor 18 has a scraper 19 that moves along the longitudinal direction between each wire rod to scrape off the captured floating matter, and a carry-out conveyor drive device 2o provided at the discharge end side.
This can be driven by.

The bottom of the secondary cleaning tank 2 has a front bottom 22 that is connected to the flat bottom wall 21 of the primary cleaning tank 1 and slopes downward, and a front bottom 22 that extends upward along the flow direction from the lowest part of the front bottom 22. The rear bottom part 23 is inclined, and the carry-in end 16a of the floating object carrying means 16 is spaced upward from the front bottom part 22.

In the rear bottom part 23 of the secondary cleaning tank 2, the carry-in end 24a is located at the lowest end, and an object to be cleaned, such as a screw conveyor, is installed along the slope in order to discharge settled sand, etc. to the outside of the tank. A carry-out means 24 is provided, and can be rotationally driven by a screw conveyor drive device 25 provided on the carry-out end side.

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

Further, a discharge port 28 is provided in the secondary cleaning tank on the downstream side of the suspended matter carrying out means 16 or on its inner wall, located below the cleaning liquid level, for sucking and discharging the cleaning liquid in the tank. A circulation pump 2 is installed on the way to the discharge port 28.
9 and a circulation passage 31 having a circulation valve 30 are connected to each other. The tip of the circulation passage 31 is connected to an injection nozzle 32 located at approximately the lowest end in the secondary cleaning 12, and all or part of the cleaning water that has been discharged once is circulated to perform cleaning twice again. It is designed to be introduced into the lowest end of the tank 2.

Further, a primary wash water supply pipe 33 is branched from the circulation passage 31 between the circulation pump 29 and the circulation valve 30.
After an on-off valve 34 is opened in the middle, it is connected to a cleaning water supply port 35 provided on the inner wall 6 of the primary cleaning tank 1. This makes it possible to use part or all of the waste water from the secondary cleaning tank, which is relatively clean, as a cleaning liquid for the primary cleaning tank 1. In the illustrated example, only one washing water supply port 35 is shown, but the invention is not limited to this, and a plurality of them may be provided. Efficiency may be improved.

In the figure, numerals 36 and 37 are conveyors disposed at the discharging end of the floating matter discharging means 16 and the discharging end of the object discharging means 24, and numeral 38 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 to the secondary washing tank 2 as washing water from the clear water supply pipe 27, and at the same time relatively clean washing water is sequentially supplied from the drain port 28 provided on the downstream side of the tank. is suctioned and discharged and flows through the circulation passage 31. A part of this cleaning water is further pumped by the circulation pump 29 and supplied again into this tank from the injection nozzle 32 provided at the lower end of the secondary cleaning tank 2, and the remaining cleaning water is used for cleaning the primary cleaning tank 1. The water is transferred as water through the primary cleaning water supply pipe 27 and supplied into the primary cleaning tank 1 .

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 M 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 washed away by the vortex flow formed by the stirring blade 1o. The primary cleaning is performed by stirring. If only one stirring blade 1o is provided as in the illustrated example, the inside of the cleaning section on the side in the rotating direction of the blade will be sequentially stirred, but by providing two stirring blades 1o as shown in the imaginary line, stirring will be performed twice. I can do it.

In particular, by dividing the inside of the tank into multiple parts to reduce the amount of material to be cleaned at one time in the cleaning section, the agitation and crushing forces are increased, ensuring that solids (such as human excrement) are crushed. It is possible to improve the cleaning efficiency.

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 previous cleaning section 7 which has been completely cleaned (washing water is ) will be transferred into the secondary cleaning tank 2.

This transfer of the object to be cleaned is performed by a jet stream from the stirring blade 10 or a jet stream from the cleaning water outlet 35. By sequentially rotating the blade 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, overflow water is discharged from the drain port 13 to maintain a constant water level in the tank, but there is a tendency for floating objects to be caught on the bar screen 12 provided at the drain port 13 and obstruct the flow of the overflow water. arise. 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.

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

On the other hand, by discharging and 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,
The objects to be cleaned are divided into objects with a light specific gravity (floating objects) and objects with a heavy specific gravity (sand, etc.). When discharging the object to be cleaned, clear water is supplied from the cleaning water supply nozzle 26, and the jet nozzle 32
By circulating and supplying the cleaning water further downstream in the tank, it is possible to improve the efficiency of cleaning by dispersing residual dirt.

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 carrying-out means 16, and is discharged to the outside of the tank by the floating matter carrying-out conveyor 18 while being scraped off by the scraper 19. be done.

On the other hand, inorganic substances with heavy specific gravity (such as sand) can also be treated with clear water.
Next, it settles to the rear bottom part 23 of the tank while being washed, and is discharged to the outside of the tank by means of carrying out the object to be cleaned 24, which is a screw conveyor.

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 in advance, the cleaning effect can be improved. Secondary cleaning tank 2 with relatively little dirt as cleaning water
Since a portion of the wastewater from the plant is used, this results in significant water savings.

In other words, although the waste water from the secondary cleaning tank 2 is slightly dirty,
Since this is used for the primary cleaning of heavily soiled items, the items to be cleaned can be cleaned to a considerable extent in advance, and the cleaning water in the tank will not be extremely contaminated during the secondary cleaning. There isn't. 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 the above embodiment, when a plurality of stirring blades 10 (two units) are provided as shown in the imaginary line in FIG.
As shown in the figure, one stirring blade driving device 11 may be provided, and the driving gear 39 and the driven gears 40 and 40 connected to each stirring blade 10 may be rotated 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 exhibited.

(1) Sand, V6 clear, etc. are first washed in the primary washing tank using waste water from the secondary washing tank, and then washed for a second time in the secondary washing tank, so the sand is discharged. The cleaning effect can be increased by preventing dirt from adhering to surfaces such as
Additionally, running costs can be lowered due to significant water savings.

(2) Since the inside of the primary cleaning tank is divided into a plurality of parts for stirring and cleaning, the cleaning water is more vigorously agitated and the cleaning effect can be increased.

(3) The rotating blade can prevent the formation of clumps of dust, etc. (1) above.

In combination with the description in item (2), it is possible to significantly increase the cleaning effect.

(4) As mentioned above, since the stirring power can be increased, solids (such as human excrement) can be reliably crushed, which is sanitary.

(5) In addition, since the primary cleaning tank is divided into multiple parts and the objects to be cleaned are transferred and discharged to the secondary cleaning tank for each fixed amount, continuous processing operation is possible, unlike conventional batch processing systems. As a result, the operating efficiency of the equipment can be improved, and a large amount of objects to be cleaned can be processed.

[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 a primary cleaning tank, 2 is a secondary cleaning tank, 4 is a blade, 5 is a rotating shaft, 27 is a clear water supply pipe, and M is an object to be cleaned.

Claims (1)

[Claims] A primary cleaning tank that primarily cleans items to be cleaned such as sediment and IB residue while supplying cleaning water, and a primary cleaning tank that is connected to the primary cleaning tank,
A secondary cleaning tank that adds clear water to the primary cleaned items for secondary cleaning; and a blade for dividing the inside of the tank into a plurality of parts and sequentially transferring the washing water containing the objects to be washed into the secondary washing tank for each quantitative determination. cleaning equipment.