JPH0344804B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a traveling type scraping device used for scraping sediment in a sedimentation pond used for wastewater treatment such as urban sewage and industrial wastewater. This allows the raking board to travel without causing it to meander with the book cables, and is particularly suitable for a submerged raking device.

[Prior art] Sedimentation basins are often used to remove sedimentable substances as a step in the treatment of wastewater such as urban sewage and industrial wastewater, and the sediment that has settled in the sedimentation basin is continuously collected using a scraping device. Alternatively, sedimentation treatment can be performed by removing the water at regular intervals.

There are various types of sedimentation basins and scraping devices, one of which is a combination of a rectangular sedimentation basin and a traveling type scraping device, such as a traveling Meader type clarifier. .

This traveling type raking device is constructed by laying rails 2 on both sides of the long sides of a rectangular sedimentation tank 1, as shown in FIG. A vehicle that is mounted across the street, has a scraping plate 4 that can be raised and lowered on the traveling vehicle 3, and is connected to two cables 5 such as chains or wires to drive the traveling vehicle 3, and a traveling vehicle 3. A drive unit is mounted on the drive unit 3, and the drive unit is configured to transmit power from a motor or the like.

On the other hand, the rectangular settling basin 1 has a pit 7 formed at the bottom of one end thereof for collecting the sediment 6.

In such a sedimentation treatment device, the sediment 6 that has settled in the sedimentation tank 1 is collected in the pit 7 by running the traveling trolley 3 with the scraping plate 4 lowered, and the collected sediment 6 is poured into the water. While discharging the water using a pump 8 or the like, the traveling cart 3 is returned to its original position with the scraping plate 4 raised in preparation for the next scraping.

[Problem to be solved by the invention] However, in such a sedimentation tank 1, the sediment 6
Since the sludge does not settle uniformly at the bottom of the sedimentation tank 1, but rather settles irregularly, the load applied to the raking plate 4 is different on the left and right sides, and the raking plate 4 is driven while being pulled by two cables 5. Despite the fact that it is, it cannot be driven in parallel.

For this reason, a meandering movement occurs in which the sediment 6 moves from side to side, and one of the two cables 5 for driving the movement is stretched, so that the raking plate 4 is driven in parallel during subsequent raking. The problem is that it becomes impossible to do so.

Furthermore, if the raking plate 4 continues to be driven while the raking plate 4 is not driven in parallel, the inclination of the raking plate 4 will become even worse, and the traveling trolley 3 will not be able to run in parallel, causing the wheels to move away from the rail 2. There is also the problem that the wheels come off and the wheels come off.

Furthermore, in order to prevent such inclination of the raking board 4, there is a problem that the raking condition must be constantly monitored and the length of the driving cable 5 must be checked frequently.

This invention was made in view of the problems of the prior art, and it is possible to drive the raking plate while always keeping it parallel even if the sediment is not uniform, and it also requires the cables necessary for driving. The present invention aims to provide a raking device for a rectangular sedimentation tank that requires only one strip.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the raking device for a rectangular sedimentation tank of the present invention includes a traveling bogie equipped with a girder that lays rails on both sides of the rectangular sedimentation tank and crosses the rectangular sedimentation tank. In the raking device, a raking plate is attached to the traveling trolley to slide on the bottom of the sedimentation basin and rak up the sediment. A parallelogram link for correction is formed, and one end of the connecting link is rotatably connected to the center of both side links of this parallelogram link, and the other end is connected from the center of the girder of the traveling bogie. It is characterized in that it is rotatably connected at a distance, and one end of a cable for traveling drive is connected to the center of one of the front and rear links of the parallelogram link.

"Function" Connecting links connected to the center of the links on both sides of the parallelogram link are rotatably attached to the girder that crosses the rectangular sedimentation basin of the traveling bogie, and cables for traveling drive are attached to the front and rear links. When the scraping plate attached to the traveling trolley starts to tilt, the four links for meandering correction change from a rectangular shape to a parallelogram shape, and the point of application of the driving force from the cables becomes This results in eccentricity toward the side with greater resistance, and the resulting correction force works to return the scraping plate to parallel, which is used to automatically correct the scraping plate to be parallel at all times.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figures 1a, b, and c are a plan view, a front view, and a side view of an embodiment in which the raking device for a rectangular sedimentation tank of the present invention is applied to a submerged type.

This submerged raking device 10 for a rectangular sedimentation basin differs from the device already explained in FIG. 4 only in the drive mechanism 9 of the traveling trolley 3, and the other parts have almost the same configuration, so the same parts include: The same numbers will be written and the explanation will be omitted.

This submerged raking device 10 for a rectangular sedimentation basin is able to travel by having wheels 3a of a running cart 3 placed on rails 2 laid underwater on both sides of the long sides of the bottom of a rectangular sedimentation basin 1. ing. This running bogie 3 has side beams 3b to which front and rear wheels 3a are attached, which run on rails 2, and these side beams 3.
and a girder 3c arranged so as to cross the sedimentation tank 1 connecting the sedimentation ponds 1 and 3c.

A sedimentation pond 1 is provided below the girder 3c of this traveling truck 3.
A scraping plate 4 is attached to scrape the sediment 6 into the pit 7 while sliding on the bottom of the pit, and is lowered only when scraping by a lifting mechanism (not shown) consisting of a lifting cam, etc. It is now possible to do so.

The drive mechanism for driving the traveling trolley 3 as described above uses a single wire 11, and a parallel wire for meandering correction is used to automatically correct the inclination and meandering of the scraping plate 4 with respect to the direction perpendicular to the running direction. The wire 11 and the girder 3c are connected via a quadrilateral link 12.

As shown in an enlarged view in FIG. 2, this parallelogram link 12 has short both-side links 12a arranged on both sides of the sedimentation tank 1, and long front and rear links 12b arranged at the front and rear of the sedimentation tank 1. Each link 12a
The ends of the links 12b and 12b are rotatably connected by pins 13, and normally have a rectangular shape.
When the meandering is corrected, it becomes a parallelogram.

One end portion of a connecting link 14 is rotatably connected to the center portion of each side link 12a of such a parallelogram link 12 by a pin 13,
The other end portions are rotatably attached with pins 13 at positions equidistant from the center of the girder 3c in the width direction.

And the rear link 12 of the parallelogram link 12
A connecting pin 15 for connecting the wire 11 is attached to the center part of b, so that the wire 11 can be hooked and the traveling carriage 3 can be pulled from the rear side.

As a mechanism for driving the traveling carriage 3 by this wire 11, for example, the wire 11 is wound around a motor-driven winding drum and a delivery drum installed on the side of the pit 7 of the sedimentation tank 1, and the wire 11 is wound around a winding drum and a delivery drum on the side opposite to the pit 7. The middle part of the wire 11 is connected to the parallelogram link 12 through a sheave installed in the
A device that is hooked onto a connecting pin 15 is used.

The raking of the sediment 6 by the submerged raking device 10 for rectangular sedimentation basins configured as described above is carried out as follows. (See also Figure 4).

After lowering the scraping plate 4 attached to the traveling trolley 3 waiting on the opposite side of the settling tank 1 from the pit 7 by operating the lifting mechanism, the traveling drive motor is started and the wire 11 The traveling truck 3 is run so as to wind up the sediment 6 on a winding drum, and raking of the sediment 6 is started.

Then, the parallelogram link 12 for meandering correction is pulled in a rectangular state via the wire 11, and scrapes up the sediment 6 on the scraping plate 4 at right angles to the running direction.

On the other hand, if the sediment 6 is not uniform and the load applied to the scraping plate 4 is different, as shown in FIG. begins to tilt with respect to the direction perpendicular to the traveling direction, but at this time, the parallelogram link 12 for meandering correction changes from a rectangular state to a parallelogram, and the connecting pin 15 to which the wire 11 is connected changes.
The position of will move from the center to the side with greater resistance.

For this reason, the driving force of the wire 11 generates a component force that attempts to restore the tilt of the scraping plate 4, and the scraping plate 4 is corrected so as to return parallel to the direction perpendicular to the running direction. After the correction, the parallelogram link 12 returns to the rectangular state and the traveling carriage 3 is driven to run normally.

Therefore, if raking by the raking plate 4 is continued via the traveling trolley 3 by the wire 11, each time the raking plate 4 meanders due to the parallelogram link 12, this is automatically done. The raking is performed while the slope is always kept parallel to the direction perpendicular to the travel direction without increasing the inclination.

Therefore, even when driven by only one wire 11, the scraping plate 4 does not tilt, and the sediment 6 can be scraped without causing the wheels 3a of the traveling truck 3 to come off the wheels.

In the above embodiments, the application was explained to a submerged-type Meeder-type clarifier, but the present invention is not limited to this, and can be applied to a wide range of mobile-type raking devices, for example, it can also be applied to ground-type ones. It is.

Further, the form of the scraping plate is not limited to the illustrated example, and can be arbitrarily changed, such as by attaching selenium to the tip of the scraping plate.

Furthermore, the drive mechanism of the traveling truck is not limited to one that uses wires, but may also use other cables.

In addition, the lengths of both side links and front and rear links of the parallelogram link can be arbitrarily selected, but since the automatic correction force of the scraping board changes depending on these lengths, the expected sedimentation It is desirable to determine this based on the variation in the weight of the object.

Furthermore, the format of the sedimentation basin is not limited to the case where a pit is provided at one end and raking is carried out in one direction, but it can also be applied when a pit is provided in the center and raking is carried out from both sides. The connection is not limited to the rear link, but may also be connected to the front link.

[Effects of the Invention] As described above in detail with one embodiment, the raking device for a rectangular sedimentation basin of the present invention has the following effects:
A connecting link connected to the center of the links on both sides of the parallelogram link is rotatably attached to the girder that crosses the rectangular sedimentation basin of the traveling bogie, and
Since the running drive cables are connected to the front and rear links, when the scraping board attached to the running trolley starts to tilt, the four links for meandering correction change from a rectangular shape to a parallelogram shape. As a result, the point of application of the driving force by the cable is eccentric to the side with greater resistance, so the correction force acts to return the raking board to parallel, and this is used to automatically keep the raking board parallel at all times. Can be fixed.

Therefore, raking can be carried out with a single cable without tilting the raking board, and the running truck does not come off the rails.

In addition, the mechanism is simpler than before, making maintenance easier and eliminating the need for frequent monitoring during operation.

[Brief explanation of drawings]

FIGS. 1a, b, c to 3 show an embodiment of the raking device for a rectangular sedimentation tank of the present invention suitable for a submerged raking device, and FIGS. 1 a, b, and c are plan views;
Front view, side view, 2nd figure is a partially enlarged perspective view, 3rd figure is a partially enlarged perspective view.
The figure is an explanatory diagram of the operation, and FIG. 4 is a schematic explanatory diagram of the object to which the present invention is applied and a conventional device. 1: Sedimentation pond, 2: Rail, 3: Traveling trolley, 3
a: Wheel, 3b: Side beam, 3c: Girder,
4: raking board, 6: sediment, 7: pit, 8: submersible pump, 10: submerged raking device for square sedimentation basin, 11: wire, 12: parallelogram link, 1
2a: Both sides links, 12b: Front and rear links, 13:
pin, 14: connecting link, 15: connecting pin.

Claims (1)

[Claims] 1 Rails are laid on both sides of the rectangular sedimentation tank, and a traveling trolley equipped with a girder is run across the rectangular sedimentation tank, and a raking board is attached to this traveling trolley to slide on the bottom of the sedimentation tank and scrape up the sediment. In the raking device, the ends of each of the four links are rotatably connected to form a parallelogram link for meandering correction, and a connecting link is provided at the center of both side links of this parallelogram link. One end is rotatably connected, and the other end is rotatably connected at a position equidistant from the center of the girder of the traveling bogie, while the center of one of the front and rear links of the parallelogram link. A raking device for a rectangular sedimentation pond, characterized in that one end of a cable for traveling drive is connected to the raking device.