JPS5942051A - Sand washing device - Google Patents

Abstract

PURPOSE:To separate efficiently the dirt and sand in contaminated sand by separating the dirt and the sand with a drum screen then washing the sand separated away of the dirt by the counter current contact with washing water. CONSTITUTION:Washing water A is successively supplied through a pipeline 12 to washing tanks 11, 10, and contaminated sand is charged through a supply port 17 into a transfer case 16 and is fed by a screw conveyor 19 to a drum screen 24 where the dirt and sand in the contaminated sand are separated. The dirt is removed through a discharging port 18. The fine dirt is scraped up with a bucket 25, is charged into a hopper 26 and is removed through the port 18. The separated sand is moved along a slope in a washing tank 10, contacts with the water A in counter current and is mixed therewith and is washed by agitating vanes 31. The washed sand is scraped up with a bucket 27, and is fed with a chute 30 into an adjacent washing tank 11. The sand therein is similarly brought into the counter current contact with the fresh washing water A and after such secondary washing, the sand is scraped up with a bucket 28 and is delivered with a chute 30 to the receiving tray 29 on the outside of the drum system.

Description

Detailed Description of the Invention The present invention is applicable to the removal and cleaning of organic components adhering to sludge that has been precipitated and removed in a sedimentation tank of a sewage or frozen ground treatment plant, etc., and the separation and removal of filth such as mixed floor furniture. The present invention relates to a sand washing device that performs sand cleaning.

In general, the sewage deposited in settling ponds at sewage and bed treatment plants is contaminated with impurities such as vegetable scraps, organic matter from frozen fields, etc., as well as small pieces of wood, vinyl, etc. These can cause secondary pollution such as foul odors, dirt in the vicinity due to dripping sewage, and contamination of groundwater due to landfill disposal. Therefore, these adhering organic substances and contaminants should be separated and removed, and clean sand should be efficiently recovered. Currently, there is a demand for the development of a device 6 that can do this.

This invention was developed in view of the above circumstances, and is characterized by separating dirt from sand in dirty sand, and washing the sand from which dirt has been separated and removed by countercurrent contact with washing water. The present invention aims to provide a sand washing device that does the following.

Embodiments of the present invention will be described in detail below based on the drawings.

Figures 1 to 3 show a plane view, a longitudinal side view, and a front view of a first embodiment of the sand washing device of the present invention, respectively. a cone-shaped drum, so that it can be rotatably mounted horizontally;
Driven rollers 2, 2 having the same diameter are installed at two positions in front of the outer periphery, and each of these driven rollers 2, 2 is positioned symmetrically at the lower side.
The fir is held by a drive roller 3 and a support roller 4.

The friction torque of the drive roller 3, which is interlocked from the prime mover 5 with a speed reducer through the transmission chain 6, causes the speed to increase from 4 to 50% per minute.
It is designed to be able to rotate 6 times. In this case, the transmission means (i.

M rubbing roller, not limited to chain mechanism,
For example, a large gear may be attached to the outer periphery of the drum 1, and a binion may be attached to the prime mover side so that rotation can be detected.
Alternatively, it goes without saying that a pinion gear may be attached to the drum 1 and a sprocket wheel may be attached to the prime mover side to transmit rotation.

On the other hand, the front end, the middle part, and the end part on the expansion side of the drum 1 are respectively concentric with the rotation center of the drum 1, and
Is it a water inlet whose diameter gradually increases toward the tip of drum 1? A baffle plate 7, 8.9 having a baffle plate a, 8a, 9a is installed inside, and these baffle plates ? , cleaning tank 10 between 8.9,
1.1 should be formed. And the cleaning tank 11 on the terminal side
Cleaning water A supplied into the cleaning tank 11 via the cleaning water supply pipe 12 connected to the inside overflows the water passage port 8a of the flow plate 8 and flows into the cleaning tank 10 on the tip side, and is further impeded. flow plate 70
The water overflows the lower water passage a and flows to the drainage gutter 13 outside the drum (outside the system).

Further, a truncated cone-shaped screen 14 that expands in a direction opposite to the slope of the drum 1 is disposed within the tip side cleaning tank 10, and a separation tank 15 is formed within this screen 14. A cylindrical transfer case 16 passes through the separation tank 15 directly through the center of the drum 1, and has a dirt supply port 17 at the distal end and a waste discharge port 18 at the distal end. This transfer case 16 has a screw conveyor 19.
is rotatably built in, and a small moving shaft +93 of this screw conveyor 19 protrudes from the distal end, a driven sprocket 20 attached to this protruding portion, and a drive sprocket attached to the shaft 21 of the drive roller 3. Screw conveyor 19 via chain 23 suspended on sprocket 22
It's time! I'm ready to help. In addition, separation -1'l
A drum screen 24 for separating dirt and sand in the dirty sand is formed in a part of the transfer case 16 in the ls. Buckets 25 , 25 . . . for scooping up filth are formed at appropriate intervals on the inner wall, and a hopper 26 for receiving filth is formed in the transfer case 16 at a portion where the packets 25 and filth falls, and a hopper 26 for receiving filth is formed in the separation tank. The waste worth 15 yen can be returned to the transfer case 16 again.

On the other hand, on the inner circumferential walls of the distal ends of the cleaning tanks 10 and 11, a plurality of sand buckets 27, 27, . . . and 28, 28, . These packets 27
, 28 to the cleaning tank 11 at the end of the drum or to the receiver III 29 outside the drum).
30, 30 are formed. In addition, each cleaning tank 10
, I+ are provided with a plurality of stirring blades 3+, 3], etc. at appropriate intervals, and these stirring blades 31, 3], etc. are used to stir the sand in the cleaning tank 10, 11. It has become.

In the sand washing apparatus of the present invention configured as described above, the dirty sand introduced into the dirty sand supply port 17 by the conveyor 2 flows into the transfer case 16 and is transferred to the front end side of the drum 1 by the screw conveyor 19. The waste is transferred and first separated into dirt and sand by the drum screen 24, and the dirt moves inside the transfer case 16 as it is and is discharged to the outside from the discharge port 18. On the other hand, the sand separated by the drum screen 24 also contains fine dirt, but these dirt are separated a second time by the screen 24, and the separated fine dirt is transferred to the screen 24. The waste moves to the expansion side along the slope of the dirt scraper, is scraped up by the dirt scraping packet 25, falls into the waste hopper 26 due to its own weight, is thrown into the transfer case 16 again, and is discharged. It is taken out from the outlet 18.

On the other hand, the sand separated by the screen 14 is inside the tip side cleaning tank 10? 8, by rotating the drum 10 times and tilting it,
It moves to the end of the drum, comes into countercurrent contact with the washing water A overflowing from the end, is further mixed and washed by the stirring blades 31, and is sent to the sand packet 27. and,
The sand that has been raked up to a certain position by the sand lifting packet 27 is drained, and when it reaches the angle of repose for the sand or higher, it is turned over and transferred to the end-side cleaning tank 11 through the chute 30.3.-Next The washed sand is washed secondarily with fresh washing water in the terminal washing tank 11 in the same manner as described above, and then scooped up while being drained by the sand lifting packet 28, and is removed from the outside of the drum system by the chute 30. The sand is sent to the receiving tray 29 as cleaning sand. Note that the organic components separated from the sand are suspended and passed from the distal side cleaning tank 11 through the water passage port 8a of the 15fl flow plate 80 to the distal side cleaning tank 10, and further through the separation tank 15 to the water passage through the baffle plate 7. It flows down the lower a and is discharged.

The separated waste is sent to a separate treatment device (not shown) using a belt conveyor or the like, and the overflow wastewater containing suspended matter is returned to the settling basin (not shown) for treatment.

FIG. 4 shows a second embodiment of the invention, in which the drum 1
By disposing the transfer case 16 in the separation tank 15 from the tip side, the dirt is dropped into the separation tank 15 from the discharge port 18' of the transfer case 16, and the waste separated by the separation tank 15 is scraped. This is a case where the waste is scraped up by the foot 25 and the part that falls under its own weight is discharged out of the system by the waste chute 33.

FIG. 5 shows a third embodiment of the present invention, which does not use a transfer case 16 and a screw conveyor 19.
This is a case where the dirty sand is directly charged into the separation tank 15. That is, the dirty sand charging chute 34 is placed so as to face into the separation tank 15 from the front end of the drum.
35 is a frame for horizontally mounting the drum 1.

FIG. 6 shows a fourth embodiment of the present invention, in which dirty sand is separated more efficiently. In other words, a shower is placed above the dirty sand thrown into the screen IVI. This is a case where separation is facilitated by disposing a pipe 36 and injecting pressure water.In this case, if waste becomes entangled in the screen 14 of the separation tank I5, the separation tank 15 A backwashing pipe 37 is disposed above the outer periphery of the screen 14 so that the deposits on the screen 14 are dropped into the separation tank 15 by jetting pressure water, so that the screen 14 can be kept clean at all times.

As explained above, according to the sand washing device of the present invention,
Separation of dirt such as floor tableware mixed in the dirty sand by separation, separation of sand with organic components etc. attached by stirring blades, and movement of the sand on the slope due to the weight of the sand, which separates the washing water. Since the cleaning action is combined with the flow contact, it is possible to reliably separate the dirty sand from the filth and remove the organic matter adhering to the sand.In addition, the sand that has fallen from the separation tank into the cleaning tank is Because the cleaning tank has an independent structure, it is similar to the process of rinsing and dehydrating the reservoir in a washing machine (after being washed and drained once, it is washed and drained again, so organic matter attached to sand is removed). can be removed efficiently with a small amount of washing water.As mentioned above, since the amount of washing water is small, running costs are low, and the amount of washing water is also reduced accordingly, so it is possible to reduce the amount of sand that flows out. It has excellent effects such as improved sand recovery rate, and because it combines multiple functions into one compact device, the volume is small and the installation area is correspondingly small. Since the driving part is relatively slow, there is less friction on the main body, etc., and effects such as smooth rotation are obtained, so the value of its use is remarkable.

In addition, the device t of this invention (small diameter 1200 m, large diameter +
As a result of continuous rotation of the cleaning water needle at 2 to 8 rotations per minute at a distance of 400 am, length + 4 oOmm, equivalent to 7 times the amount of dirt sprayed, a layer of 88. It was confirmed that the COD removal rate was 85 to 90% μm, and the amount of washing water was reduced to 1/10 compared to conventional equipment of this type.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a first embodiment of the sand washing device of the present invention, FIGS. 2 and 3 are a vertical side view and a front view thereof, respectively, and FIG. 4 is a diagram of the sand washing device of the present invention. 5 is a longitudinal side view showing a third embodiment of the sand washing device of the present invention; FIG. 6 is a main part showing a fourth embodiment of the sand washing device of the present invention. FIG. In the figure: 1 truncated conical drum 7, 8.9 baffle plates 7a, 8
a, 9a Water port 10 + ” Cleaning tank 12
Cleaning water supply pipe 14 Conical screen 15 Separation tank 16 Transfer case 17
Dirty sand supply port 18 Dirty discharge port 19 Screw conveyor 24 Tramsk IJ
25 Packet for scooping up filth 27, 28 Packet for lifting sand 30 Chute 31
PIT stirring blade 34 This is the waste input chute. Patent applicant Suido Kiko Co., Ltd. Figure 3, 28 Figure 4 5 5

Claims (1)

[Claims] 1. The tip of a truncated cone-shaped drum that is rotatably suspended horizontally;
A plurality of cleaning tanks are formed by installing baffle plates in the middle part and the end part, each having a water passage hole that is concentric with the center of rotation and whose diameter gradually increases toward the tip of the drum. At the same time, the cleaning water supplied from the end of the drum is made to sequentially overflow the water passage port of the baffle plate and flow into each cleaning tank, and the cleaning tank at the end of the drum has a gradient of the drum. A cone-shaped screen that expands with the same number in the opposite direction is installed, and dirt is collected in a separation tank formed inside this cone-shaped screen □
forming a sand input part and a discharge port for discharging the waste separated from the dirty sand, and forming a plurality of packets opening in the rotational direction of the drum on the inner wall on the distal side of each of the cleaning tanks, A transfer chute is formed to scrape up the sand separated from the dirty sand in each of the cleaning tanks and return the sand falling from these packets into the cleaning tank at the end of the drum or to the outside of the system, and the rotation of the truncated cone-shaped drum In this way, the filthy sand put into the separation tank is separated into filth and sand and the filth is discharged, and the sand separated from the filthy sand is separated from the washing water that overflows from the end side in each washing tank. A sand washing device characterized by cleaning by flowing contact. 2. The washing sand according to claim 1, wherein dirt packets are formed on the inner circumferential wall at the expanding end of the conical screen at appropriate intervals and can be connected to the discharge port. Device. 3. The sand washing device according to claim 1, wherein a dirty sand inlet is formed in a transfer case that incorporates a screw conveyor that is rotatably disposed in the center of the truncated TLT drum. 4. The sand washing device according to claim 3, wherein a drum screen is formed in the transfer case located in the separation tank to separate sand from dirt in the waste sand. 5. The sand washing device according to claim 1, wherein stirring blades are formed at appropriate intervals on the inner circumferential wall of each of the washing tanks.