JPS5924395Y2 - Floss scraper in circular flotation thickener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for scraping and removing floated floss during flotation concentration treatment of slurry or the like.

Conventionally, in circular pressurized flotation thickeners, floss was scraped off by rotating a pipe-type gap in the circumferential direction.
The amount of floss is larger at the outer periphery than at the center of the tank.

Therefore, when the clearance C rotates from position A to B as shown in FIG. 1, if the amount of floss scraped is adjusted to the center, the outer periphery will not be scraped enough, and the floss layer will become thicker. Eventually, it will exceed its floating limit and sink back into the liquid.

Furthermore, if the amount of floss to be scraped is adjusted to the outer periphery, the center portion will be scraped more than necessary, and dilute sludge that is not sufficiently concentrated will be scraped off, resulting in an unfavorable result in the concentration process.

The purpose of this invention is to eliminate these inconveniences and provide a device that can uniformly and accurately scrape off highly concentrated floss, keep the floss layer stable, and facilitate the subsequent mechanical dewatering operation. It is.

The present invention provides a circular flotation concentration tank rotatably equipped with a floss scraper that scrapes the floss floating on the water surface in the tank with a scraping plate. The tank is divided into two or more in the direction, and a driving device is connected to each of the divided scraping plate groups, so that the rotational speed of the divided scraping plate groups increases from the center of the tank toward the outer periphery. This is a floss scraper in a circular flotation thickener tank installed in

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. An outer cylinder having an inlet 1 opened in the direction of scraping floating sludge, etc. near the water surface of a pressurized flotation thickening tank T, and moving on the water surface. An inner cylinder 4 having a notch 3 at the top thereof is provided concentrically inside the casing 2, and a sludge transfer mechanism such as a screw blade 5 (or an endless running belt) is disposed inside the inner cylinder 4. There is.

The space between the inner and outer cylinders is divided into three in the longitudinal direction, that is, in the radial direction of the tank T, and outer cylinders 2a, 2b, and 2C are arranged in order from the center of the tank T toward the outer circumference.

Scraping plates 6 (6a, 6b, 6C) each consisting of several flat plates are installed approximately radially between each of the divided inner and outer cylinders on an annular member 7 that rotates outside the inner cylinder 4. The scraping plates 6 are connected to the respective drive devices and arranged so that the number of rotations increases from the center of the tank T toward the outer periphery, and the tip of this scraping plate 6 always rotates near the inner surface of the outer cylinder 2. The floating sludge introduced from the inlet 1 is successively scraped up by the rotation of the scraping plate 6 between the inner and outer cylinders, falls into the notch 3, and is passed through the inner cylinder 4 by the screw blade 5.
The gap C is configured so that the floss is discharged to the floss discharge launder 8 or a discharge gutter (not shown) on the opposite side.

In Fig. 2, 10 is a rotary table, 11 is a roller, 12a,
12b, 12C are scraping plate drive devices, 13 is a screw drive device, 141 to 17 are sprockets, 18.19
20 is a floss outlet chute, 21 is a roller bearing, and 22 is a bearing portion.

Further, in the fourth illustrated example, the shape of the scraping plate 6 is a curved plate to facilitate scraping up of sludge, etc., and a recessed portion is located in the direction of rotation.

Furthermore, in the fifth illustrated example, the scraping plate 6 is of a packet type.

On the other hand, the inlet 1 for floating sludge, etc. may be formed by simply cutting out a part of the outer cylinder 2 as shown in the third illustrated example, but as shown in the fourth and fifth illustrated examples, the inlet port 1 for floating sludge, etc. When the guide plate 9 is provided continuously at the lower part of the inlet 1, floating sludge can be effectively scraped off.

Alternatively, both end plates may be rotatably provided in the outer cylinder 2, and the scraping plate 6 may be attached to the end plates so as to rotate between the inner and outer cylinders.

Furthermore, instead of rotating the inner cylinder 4 or the scraping plate attachment shaft fitted to the inner cylinder 4, the outer cylinder 1 side may be made into a double cylinder and the inner cylinder may be rotated.

However, the floss floating on the water surface can be scraped off by running the clearance C in the circumferential direction of the ellipse.
By increasing the rotation speed of the scraping plates 6a, 6b, and 6C from the center of the tank T toward the outer periphery and adjusting the amount of floss taken in to gradually increase appropriately, a uniform concentration of floss is introduced without protruding from the water surface. It can be accurately scraped from the mouth 1.

That is, when the drive device (not shown) of the rotary table 10, the scraping plate drive devices 12a, 12b, and 12C, and the screw drive device 13 are started, the gap C is removed from the rotary table 1.
0, the scraping plates 6a, 6b.

6C are sprockets 15 a, 15 b, respectively.
15 C at a predetermined rotational speed, the screw blades 5 are rotated by the sprocket 17, and the outer cylinder 2 and the inner cylinder 4 make the above-mentioned turning movement, but they themselves remain fixed.

Here, an example of adjusting the rotation speed of each scraping plate (group) will be explained with reference to FIG. 6. Packet type scraping plates 6a, 6b
, 6C (same as the second illustrated example ← The scraping plate is divided into three parts in the radial direction of the tank T), and the number of rotations of the packets is adjusted according to the area ratio of the water surface of the tank T that each packet should scrape. Set.

(However, the number of packets is the same for each of the above divided parts).

That is, the number of rotations of the packets is set to R1, R2, R3 in order from the center to the outer circumference of the tank T, and the area scraped by each packet is set to S1, S2, . In the case of S3, R1:R2:R3-51:S2:S3 may be used.

To show this concretely, Sl, S2゜S3 are each 4
0m2.60m2.80 m2 and R1 is 1. When Q rpm, R2 and R3 are respectively 1.5 rpm and 2.
Orpm is set.

In this case, the number of revolutions of the packet can be adjusted by selecting the number of teeth of the sprocket driven by the scraping plate drive device 12 to be equal to the ratio of the reciprocal of the area, and by using a motor with a speed change mechanism as the drive device 12. good.

Note that the gap C has an inlet 1 and is designed to rake floss into the tank T by rotating with a scraping arm.
Any device that scrapes the floss at that location may be used, or a modified version thereof may be used.

As described above, according to the present invention, it is possible to adjust the amount of floss scraped at both the center and the outer periphery of the circular pressurized flotation tank. This makes it possible to efficiently scrape off the floss, keep the floss layer stable, and because the solids recovery rate is high, the floss dehydration operation in the next step can also be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional pressurized flotation concentration tank, Fig. 2 is a vertical sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along the knee line in Fig. 2, Fig. 4, FIG. 5 is a sectional view showing another embodiment of the scraping plate, and FIG. 6 is a plan view of the pressurized flotation concentration tank showing how to adjust the number of rotations of the scraping plate. C: Clearance, R1-R3: Scraping plate rotation speed, S-S3: Scraping area, T:
・Tank, 1...Inlet, 2...Outer tube, 3
...Notch opening, 4...Inner cylinder, 5...
...Screw blade, 6.6a, 6b, 6C...
... scraping plate, 7 ... annular member, 8 ...
・Floss discharge launder 9... Information board, 10.
...Rotary table, 11 ...Roller, 1
2, 12 a, 12 b, 12 C... scraping plate drive device, 13... screw drive device,
14 a~17...Sprocket, 18.19
. . . Cheno, 20 . . . Outlet chute, 21 . . . Roller bearing, 22 . . . Bearing section.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A circular flotation concentration tank equipped with a rotatable floss scraper that scrapes floss floating on the water surface in the tank with a scraping plate,
The floss scraping plate of the floss scraping machine is divided into two or more in the radial direction of the tank, and a driving device is connected to each of the divided scraping plate groups, and A floss scraper in a circular flotation concentration tank, which is arranged so that the rotational speed increases from the center of the tank toward the outer periphery. 2. The floss scraper is provided concentrically with a movable outer cylinder having an inlet opening in the direction of scraping the floss floating on the water surface, and an inner cylinder having a cutout opening in the outer cylinder, and A floss transfer mechanism is disposed inside, and a scraping plate is rotatably disposed between the inner and outer cylinders, the space between the inner and outer cylinders is divided into two or more in the radial direction of the tank, and the The scraping machine according to claim 1, wherein the scraping machine is connected to a drive device so that the number of rotations of the scraping plate between the inner and outer cylinders increases from the center of the tank toward the outer periphery.