JPS6232639Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for scraping off scum floating on the water surface of a settling tank, flotation tank, etc.

As a prior art of such a scum scraping device, for example, Japanese Utility Model Application No. 54-47973 discloses a movable outer cylinder with an inlet opening in the direction of scraping sludge etc. floating on the water surface, and the outer cylinder. It is known that an inner cylinder with a notch opening in the upper part is provided concentrically within the inner cylinder, a sludge transfer mechanism is disposed within the inner cylinder, and a scraping plate is rotatably disposed between the inner and outer cylinders. However, in this prior art, the lower part of the movable outer cylinder is partially submerged in the processing tank, and a scum guide plate protruding forward in the moving direction of the movable outer cylinder from the lower end surface is placed below the scum. In the case of a cylindrical processing tank, the movable outer cylinder only needs to be rotated (revolving) in one direction. However, in the case of a processing tank with a rectangular planar shape, in which such a movable outer cylinder must be moved back and forth along the longitudinal direction of the processing tank, the return stroke after scraping off the scum is When moving the moving outer cylinder while keeping it at the same height as during the forward stroke, the water surface in the treatment tank will be
Since this movable outer cylinder causes vigorous agitation, in such conventional devices, the entire scraping device including the movable outer cylinder is mounted on a cart that supports it so that it can move freely. The device is also supported so that it can be raised and lowered, and during the return stroke, the movable outer cylinder is pulled up above the water surface.

The purpose of this invention is to create a scum scraping device that not only eliminates the need for such a lifting device in a processing tank with a rectangular planar shape, but also scrapes scum during this return stroke. This is what we are trying to provide.

In addition, in the conventional device described above, the lowest part of the scum scraping device is always blocked by the movable outer cylinder and the scum guide plate, so in the case of a rectangular processing tank, the scraping process A blind spot is created at the starting end of the scraper, and at this starting end, the scum at the bottom of the scraping device is simply pushed down below the water surface by the movable outer cylinder and guide plate, and is left behind. . Another object of this invention is to provide a scum scraping device that does not create such a blind spot.

That is, the scum scraping device according to this invention,
A dolly that can move back and forth in the scum scraping direction through a scum discharge pipe, which has an input port opened in its upper part along its longitudinal direction, and a scum transfer screw is disposed inside its longitudinal direction. A scum lifting conveyor is disposed on the outside of this scum discharge pipe, and a scum lifting conveyor is disposed above the processing tank in a horizontal position perpendicular to the scum scraping direction. Below the pumping conveyor, it is pivotally supported on a trolley and is movable up and down between a position where it acts on the scum and a position where it does not act on the scum.
A scum scraping device equipped with a scum scraping guide plate, wherein the scum lifting conveyor includes a plurality of pairs of sprocket wheels disposed above and below the scum discharge pipe and mounted on a truck; It consists of a plurality of endless chains suspended between each pair of sprocket wheels, and a large number of buckets suspended back-to-back between the endless chains in both rotational directions of the endless chains. The bucket cart is rotated in a vertically elongated circular orbit, and the scum scraping guide plate is a pair of rocking wheels that are pivoted on the truck concentrically with the lower sprocket wheel. and a plate spanned between the free ends of the pair of rocking plates, the scum scraping guide plate extending between a forward working position and a rearward working position. It is characterized by being able to rotate freely,
To explain the embodiment with reference to the figures, in the figure, 1
is a trolley that spans the processing tank 2 so that it can move forward and backward along the longitudinal direction of the processing tank 2, which has a rectangular planar shape, above the processing tank 2, 3 is its wheels, and 40 is a rail. Above the treatment tank 2, a scum discharge pipe 4 is maintained by the trolley 1 in a horizontal position perpendicular to the traveling direction of the trolley 1.
are supported via brackets 5, 5'. The scum discharge pipe 4 has a scum inlet 7 having a hopper 6 in its upper part along its longitudinal direction.
is opened, and a transfer screw 9 having a drive shaft 8 is disposed inside the hopper along its longitudinal direction. When the scum is introduced into the input port 7 through the hopper 6, the scum is Transfer screw 9
The scum is sent to the right in the discharge pipe 4 (upper part of Figure 1) and is discharged from the discharge port 10 into the scum discharge gutter 11. A scum lifting conveyor 12 is provided for lifting up the scum floating in the processing tank 2 and throwing it into the hopper 6.

Next, to explain the scum lifting conveyor 12 of the embodiment, 13 and 13' are left and right sprocket wheels arranged above the scum discharge pipe 4 and mounted on the cart 1 with a shaft 14, and 15 and 15' are left and right sprocket wheels. , left and right sprocket wheels mounted below the scum discharge pipe 4 and mounted on a shaft 16 on the trolley 1, and chains 17, 17' between the upper and lower sprocket wheels 13, 15, 13', 15' is hung around the outside of the scum discharge pipe 4, and between the left and right chains 17, 17', a large number of pairs of buckets _18a , _18b are arranged at regular intervals to open the opening of the pipe. , are spanned back-to-back with each pair facing in opposite rotational directions. Then, when the scum lifting conveyor 12 consisting of a large number of pairs of buckets 18 _a and 18 _b attached to the chains 17 and 17' is rotated in the opposite direction of arrow A or A, the buckets 18 _a or 18 _b It rotates in a vertically long elliptical orbit, and below the scum discharge pipe 4,
The scum conveyor 12 is located at a position where it can pump up the scum A in the processing tank 2. Below the scum lifting conveyor 12, there is a pair of rockers pivotally supported on the shaft 16 via bearings 19, 19'. moving plates 20, 20';
A scum scraping guide plate 21 is provided, which is configured with a plate spanned between the free ends of the pair of rocking plates 20, 20'. Central portion 2 with arc-shaped vertical cross section
1 _a , and linear front and rear portions 21 _b continuing before and after it, and the buckets 18 _a and 18 _b of the scum lifting conveyor 12
When the scum scraping guide plate 21 is kept in the position shown by the solid line in Figure 2, the scum scraping guide plate ₂₁ slides into the arcuate central portion 21a of When the shaped portion 21 _b is positioned below the scum A in the processing tank 2 and is rotated to the position shown by the chain line in FIG. The portion 21b is located below the scum A in the processing tank 2.

In the figure, 22 is a sprocket wheel fitted on the drive shaft 8 of the transfer screw 9;
25 is a sprocket wheel fitted to the upper shaft 14 of the scum lifting conveyor 12, and 25 is a sprocket wheel fitted to the support shaft 16 of the scum lifting guide plate 21.
2, 23, and 25 are connected to a drive source (not shown) on the truck 1 via chains 26, 27, and 28, respectively.

Next, the operation will be explained with reference to an embodiment. Since the scum scraping device according to the invention has the above-mentioned configuration, when the cart 1 is run on the processing tank 2, the scum scraping device according to the invention The above scum discharge pipe 4
The scum lifting conveyor 12, the scum scraping guide plate 21, etc. can be integrally moved back and forth over the processing tank 2. However, the device of this invention now moves the scum scraping guide plate 21 , from the backward working position shown by the chain line in FIG. 2 to the forward working position shown by the solid line, and place the scum A on top of it.
After scooping up the scum, the scum scraping guide plate 21 is kept in the working position facing the direction B, and the scum lifting conveyor 12 is rotated in the direction of the arrow A.
When moving the trolley 1 in the direction B, the scum A is removed from the scum scraping guide plate 12 by moving the trolley 1 in the direction B.
The scum A that has been scooped up onto the scum scraping guide plate 12 is
Pumping conveyor 12 that touches and reaches above it
The scum is pumped up into the bucket _18a on the guide plate 21 by the bucket _18a facing in the direction of A, and the scum that has been pumped into the bucket _18a is lifted up by the bucket _18a . When it is turned over, it passes through the hopper 6 and the input port 7,
The scum is discharged into the scum discharge pipe 4. The scum supplied into the scum discharge pipe 4 is transferred to the transfer screw 9
As already explained, the scum is discharged from the discharge port 10 to the scum discharge gutter 11.

The device of this invention rotates the scum scraping guide plate 21 to the backward working position shown by the chain line in FIG. When rotating the trolley 1 in the opposite direction of arrow A, and moving the trolley 1 in the direction opposite to B, by moving the trolley 1 in the direction B,
Contrary to the above, the bucket 18 facing in the opposite direction.
The scum A can be pumped up by _b and discharged into the scum discharge pipe 4.

The embodiments of the scum scraping device according to this invention have been described above, but as can be easily understood from the above, the scum scraping device according to this invention can remove scum in the processing tank. The scum is pumped up by a large number of pairs of back-to-back buckets installed on a scum lifting conveyor that rotates around the outside of the scum discharge pipe, and then supplied to the scum discharge pipe. The scum scraping guide plate, which serves as an auxiliary means for lifting scum, is designed so that it extends between a forward-facing scraping-guiding position and a backward-facing scraping-guiding position with respect to the scum in the tank. Since it is configured to be freely displaceable, the scum scraping device of this invention can scrape off scum by moving the truck in either direction, as described above.
Furthermore, in the scum scraping device of this invention, the scum lifting conveyor is rotated in an oval orbit, and the scum scraping guide plate is concentric with the lower sprocket wheel. It consists of a pair of rocking plates that are pivotally supported on a truck, and a plate that spans between the free ends of the pair of rocking plates. A scum scraping guide plate positioned below the water surface is rotatably supported at the bottom of the scum lifting conveyor concentrically therewith and is displaced between a forward and rearward working position. Since the scum scraping guide plate can be moved freely, if the scum scraping guide plate is moved from the inactive position in the direction to the working position in the direction before starting scraping when going forward or backward, the bottom of the scraping device will be moved. Most of the scum in the processing tank is scooped up onto the scum scraping guide plate and pumped up by a bucket. There are almost no blind spots as mentioned above.

In addition, in the device of this invention, since the scum lifting conveyor is rotated in a vertically long elliptical orbit, the front and rear width of the cart that supports it may be small, and the scum discharge pipe is Since the position can be set higher than the treatment tank, the treatment tank can be given sufficient clearance above the water surface.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of a scum scraping device according to this invention, and FIG. 2 is a longitudinal sectional side view of the same. 1... Cart, 2... Processing tank, 4... Scum discharge pipe, 7... Input port, 9... Scum transfer screw, 12... Scum pumping conveyor, 13,1
3', 15, 15'... Sprocket wheel, 1
7, 17'... Endless chain, 18 _a , 18 _b ...
Bucket, 21... Scum scraping guide board.

Claims (1)

[Scope of utility model registration request] A dolly that can move back and forth in the scum scraping direction through a scum discharge pipe, which has an input port opened in its upper part along its longitudinal direction, and a scum transfer screw is disposed inside its longitudinal direction. A scum lifting conveyor is disposed on the outside of this scum discharge pipe, and a scum lifting conveyor is disposed above the processing tank in a horizontal position perpendicular to the scum scraping direction. Below the pumping conveyor, it is pivotally supported on a trolley and is movable up and down between a position where it acts on the scum and a position where it does not act on the scum.
A scum scraping device equipped with a scum scraping guide plate, wherein the scum lifting conveyor includes a plurality of pairs of sprocket wheels disposed above and below the scum discharge pipe and mounted on a truck; It consists of a plurality of endless chains suspended between each pair of sprocket wheels, and a large number of buckets suspended back-to-back between the endless chains in both rotational directions of the endless chains. The bucket cart is rotated in a vertically elongated circular orbit, and the scum scraping guide plate is a pair of rocking wheels that are pivoted on the truck concentrically with the lower sprocket wheel. and a plate spanned between the free ends of the pair of rocking plates, the scum scraping guide plate extending between a forward working position and a rearward working position. A scum scraping device characterized by being rotatably displaceable.