JPS6331746Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concentrated sludge scraping device for scraping up sludge floated in a pressurized flotation thickening tank.

A general pressurized flotation concentration tank will be explained based on FIGS. 1 to 3. This pressurized flotation thickening tank 1 is equipped with a drainage tank 2 extending in the longitudinal direction and a sludge discharge groove 3 arranged on the side. When the air is fed into the pressurized flotation concentration tank 1 through the channel 4, the air is foamed by the decompression action, and the air bubbles adhere to the sludge contained in the precipitated water and float to the surface, producing the thickened sludge 5. This thickened sludge 5 is scraped up by a thickened sludge scraping device 6 that can run in the length direction of the pressurized flotation thickening tank 1 and carried out to the sludge discharge groove 3, while the separated water 7 is passed from the communication path 8 to the drainage tank 2. After that, it is discharged outside over the overflow weir 9.

FIG. 4 shows a conventional thickened sludge scraping device 6, where 10 is an endless chain installed across the upper part of the pressurized flotation thickening tank 1, and flights 11 are attached at appropriate intervals. It is being When this chain 10 is run toward the sludge discharge groove 3, the concentrated sludge 5 is scraped up by the flights 11, and is carried out to the sludge discharge groove 3 by passing over the side wall of the pressurized flotation thickening tank 1 by the inclined guide plate 12. will be done.

However, in such a conventional device, there is a problem that the sludge 5 escapes downward due to the operation of the flight 11, resulting in poor scraping efficiency.

Therefore, the object of the present invention is to prevent the above-mentioned sludge from escaping and to scrape up the sludge efficiently.

In order to achieve this objective, the present invention is equipped with a traveling truck that can run longitudinally on the upper surface of the sludge pressurized flotation thickening tank, and this traveling truck is equipped with a drive sprocket driven by a power device, and a drive sprocket that is connected to the traveling truck. , a variable position sprocket whose position can be changed by relative movement; , an idling sprocket is provided at the tip of the swinging arm, an endless chain is hung between the drive sprocket, the variable position sprocket, and the idling sprocket, and the endless chain is connected to the variable position sprocket based on the relative movement of the variable position sprocket. The swinging arm is positioned in the sludge at the idler sprocket portion by the downward movement of the swing arm, and buckets are installed at appropriate intervals to scrape up the sludge by running an endless chain. A backup plate is attached to the tip of the swing arm to prevent the sludge from escaping downward, and a trough is provided to receive the sludge scooped up by the bucket and guide it out of the thickening tank.

Therefore, by using a bucket to scoop up the sludge and providing a back-up plate, it is possible to prevent the sludge from escaping downward and to efficiently scoop up the sludge.
Moreover, normally in equipment using a chain, a take-up device is required to absorb the elongation, but with this invention, the weight of the swinging arm etc. can fulfill the role of take-up, and it can be used as both a bucket lifting device and a take-up device. Therefore, no special take-up equipment is required.

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6. Here, reference numeral 13 denotes a pair of rails laid on the side wall 14 of the pressurized flotation concentration tank 1, and on this rail 13, a traveling carriage 15 that can run on the concentration tank 1 in the longitudinal direction is arranged. 1
6 is a motor for driving the truck 15. An arm 18 is attached to the support stand 17 on the trolley 15,
This arm 18 is provided with a drive sprocket 20 driven by a power device (motor) 19 on the support base 17.

A bucket hoisting device 21 is provided on the trolley 15, and the bucket hoisting device 21 has an idling position that can be moved horizontally by a drive device disposed inside to make its position variable. A variable sprocket 22 is attached. On the other hand, a downward bracket 23 is erected on the trolley 15,
The base end of a swinging arm 24 that can swing toward the sludge 5 due to its own weight is swingably attached to the bracket 23. An idling sprocket 25 is attached to the tip of the swing arm 24.

A pair of sprockets 20, 22, and 25 are provided on each side of the truck 15 near the side wall 14 of the concentration tank 1. 26 is each sprocket 20, 22, 2
It is an endless chain that is hung over 5, and is provided in pairs on both sides of the truck 15 in accordance with the arrangement of the sprockets 20, 22, and 25. A plurality of bucket belts 27 are attached to the endless chain 26 at appropriate intervals, and are extended between the endless chains 26 on both sides to form a horizontally long bucket belt. Swing arm 24
A back-up plate 28 is attached to the tip of the bucket 27, which is located below the bucket 27 which is rotating guided by the free-rotating sprocket 25.
This backup plate 28 is connected to the swing arm 2.
When the bucket 27 of the free rotating sprocket 25 is located in the sludge 5 due to the downward movement of the rotary sprocket 4, the bucket 27 is installed so that it is in a substantially horizontal direction.

The variable position sprocket 22 is provided at a lower position than the drive sprocket 20, so the bucket belt 27 is directed slightly downward beyond the drive sprocket 20. Therefore, a trough 29 is disposed in this portion, and is configured to receive the sludge 5 falling from the bucket 27 and allow it to flow down into the sludge discharge groove 3.

Explain the action. When the variable position sprocket 22 is moved to approach the drive sprocket 20, the swing arm 24 moves downward due to its own weight, and the bucket 27 and the back-up plate 28 in the idler sprocket 25 move into the sludge 5. , and the backup plate 2 is located as described above.
8 is held horizontally. Here, the power plant 19
is actuated to move the endless chain 26 in the direction of the arrow A by the drive sprocket 20, and the traveling motor 16 is actuated to make the truck 15 travel in the direction of the arrow B. Then, the sludge 5 is scooped up by the bucket 27 at the idler sprocket 25, but at this time, the action of the back-up plate 28 prevents the sludge 5 from escaping downward, so that the scooping is reliably performed. The bucket 27 that has scooped up the sludge 5 is lifted in the direction of the arrow A and reaches the drive sprocket 20, where it turns downward and drops the sludge 5 into the trough 29.

Tension based on the weight of the swinging arm 24, the idling sprocket 25, etc. is applied to the endless chain 26 via the idling sprocket 25, so even if elongation occurs, the position of the sprocket 22 in the bucket hoisting device 21 will not change. Therefore, the role of take-up will be fulfilled.

When the traveling carriage 15 has traveled to the end of the concentration tank 1, the variable position sprocket 22 is moved away from the drive sprocket 20 as shown by the imaginary line in FIG. Then, the free rotating sprocket 25 is pulled up by the endless chain 26, the swing arm 24 moves upward, and the bucket 27 and the backup plate 28 are lifted above the sludge 5. In this state, the traveling trolley 15 is moved backwards in the direction opposite to the arrow B, returned to the starting position, and the above-described operation is repeated.

As described above, according to the present invention, by using a bucket to scoop up sludge and by providing a backup plate, it is possible to prevent sludge from escaping downward and to efficiently scrape up the sludge. In addition, although equipment using a chain normally requires a take-up device to absorb elongation, a bucket pulling device can be used to fulfill the role of take-up, eliminating the need for a special take-up device.

[Brief explanation of the drawing]

Figure 1 is a plan view of the pressurized flotation concentration tank, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a cross-sectional view of Figure 1, Figure 4 is a diagram showing a conventional example, and Figure 5. 6 is a diagram showing an embodiment of the present invention, and FIG. 6 is a side view thereof. 1... Pressurized flotation thickening tank, 5... Thickened sludge, 15
... Traveling truck, 19 ... Power device, 20 ... Drive sprocket, 22 ... Variable position sprocket,
24... Swinging arm, 25... Idle sprocket, 26... Endless chain, 27... Bucket,
28...backup plate, 29...trough.

Claims (1)

[Scope of utility model registration request] A traveling trolley is provided that can run longitudinally on the upper surface of the sludge flotation thickening tank, and this traveling trolley is equipped with a drive sprocket driven by a power device and a drive sprocket that can be moved relative to the traveling trolley to change its position. A variable position sprocket is provided, the base end is swingably attached to the traveling trolley, and a swinging arm is provided which can swing toward the sludge below the traveling trolley due to its own weight, and a swinging arm is provided at the tip of the swinging arm. A rotating sprocket is provided, an endless chain is hung between the driving sprocket, the variable position sprocket, and the idle sprocket, and the idle sprocket is connected to the endless chain by the downward movement of the swinging arm based on the relative movement of the variable position sprocket. buckets are installed at appropriate intervals to be located in the sludge and scrape up the sludge by running an endless chain, and back-up plates are provided to prevent the sludge from escaping downward when the buckets scrape up the sludge. A concentrated sludge scraping device characterized in that a trough is attached to the tip of the swinging arm to receive the sludge scraped up by the bucket and guide it to the outside of the thickening facility.