JPH0353002B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mobile raking device used for raking sediment in a sedimentation pond used for wastewater treatment such as urban sewage and industrial wastewater. It is designed to eliminate the meandering of the backing plate and the unscavenging of sediment, and is particularly suitable for a submerged raking device.

[Conventional technology] 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. It is possible to perform sedimentation treatment by removing it at specific intervals or 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. .

When this traveling type raking device is a submerged type, as shown in FIG. A traveling trolley 3 running on the sedimentation tank 1 is mounted so as to cross the sedimentation tank 1, and a raking plate 4 that can be raised and lowered is attached to the traveling trolley 3, and is placed on both sides of the settling tank 1 to drive the traveling trolley 3. Two cables 5 such as chains or wires are connected to the traveling truck 3, and are 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 collected in the pit 7. While discharging the water using a submersible pump or the like, the traveling cart 3 is returned to its original position with the raking plate 4 raised in preparation for the next raking.

[Problem to be solved by the invention] However, in such a sedimentation tank 1, the sediment 6
Because the sludge does not settle uniformly at the bottom of the sedimentation tank 1 and 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.

As a result, the traveling trolley 3 may run in a meandering manner, or one of the two cables 5 for driving the traveling may stretch, making it impossible to drive the scraping plate 4 in parallel during subsequent scraping. There is a problem with getting used to it.

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 may come off and come off, and especially in the case of a submerged type, recovery work is time consuming.

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

In addition to the problem of the meandering of the scraping plate 4 as described above, in such a scraping device, since the scraping plate 4 is attached to the central part of the traveling trolley 3 in the running direction, it is opposite to the pit 7. When trying to start raking by running the traveling cart 3 from the side end,
There is a problem in that it is not possible to scrape up the sediment 6 in a portion corresponding to the length L of the portion where the scraping plate 4 is attached from the end of the traveling trolley 3.

This invention was made in view of the problems of the prior art, and it is possible to drive the raking board while always keeping it parallel even if the sediment is not uniform, and it also requires the cables necessary for the drive. One bottle is enough,
Moreover, it is an object of the present invention to provide a raking device for a rectangular sedimentation tank that can rak the sediment without leaving it behind.

[Means for Solving the Problems] In order to solve the above problems, the raking device for a rectangular sedimentation tank of the present invention is provided with a pit in the middle of the rectangular sedimentation tank, and rails are laid on both sides of the sedimentation tank. In a raking device, a running trolley with wheels is run on the front and rear parts of a side beam, and a raking plate is attached to this running trolley to slide on the bottom of the sedimentation basin and scrape sediment into the pit. A pit is formed in the pit, and the side beam of the traveling truck that runs from the edge of the sedimentation basin toward the pit to collect the sediment is formed to have a length approximately equal to the shorter distance from the edge of the sedimentation basin to the opposite side of the pit. Wheels are attached to the front and rear parts of the bogie, and scraping plates are provided at the front and rear of the traveling bogie to bring the rear part of the vehicle into a raking state and to bring the front part of the vehicle into a retracted state.

In addition, the raking device for a rectangular sedimentation basin of this invention has the following features:
A rectangular sedimentation tank is equipped with pits at both ends, rails are laid on both sides of this sedimentation tank, and a running trolley with wheels is run on the front and rear of the side beam, and the bottom of the settling tank is slid on this running trolley. In a raking device equipped with a raking plate for raking sediment into a pit, pits are formed at both ends of the settling basin,
The side beam of the running bogie that is run from the edge of the sedimentation basin toward the pit to scrape the pit is formed to have a length that is approximately half the distance between both ends of the settling basin, and wheels are attached to the front and rear parts of the side beam. The vehicle is characterized in that a scraping board is provided before and after the vehicle, which brings the front part of the vehicle into a raking state and brings the rear part of the vehicle into a retracted state.

[Function] A pit is formed in the middle of the sedimentation tank, the running truck is lengthened in the running direction, and scraping plates are attached to each of the front and rear sides, and the side beams of the running truck are extended from the edge of the settling tank to the central part. The length is approximately equal to the shorter distance to the other side of the pit, and the wheels attached to the front and rear parts are used as long wheel bases to prevent meandering, while the scraping plate on the rear side in the running direction is used to direct the vehicle toward the pit in the center. I used to scrape together to get rid of any scraps left behind.

In addition, when pits are formed at both ends of the sedimentation tank, the traveling bogie is lengthened in the running direction, its side beams are approximately half the distance between both ends of the sedimentation tank, and the side beams are attached to the front and rear of the tank. While using long wheel bases to prevent meandering, raking plates are attached to the front and rear of the traveling trolley.In this case, conversely, the raking plates on the front side in the running direction are used to prevent meandering. The scraps are overlapped and scraped toward the pits at both ends to eliminate any scraping.

In either case, since the vehicle has a long wheel base and does not meander, it can be driven by a single cable.

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

Figures 1 to 3 show an embodiment of the raking device for a rectangular sedimentation basin according to the present invention, which is a submerged type.
FIG. 1 is an overall configuration diagram, FIG. 2 is a partially enlarged view of the traveling carriage, and FIG. 3 is a partial side view of the scraping plate.

In the rectangular sedimentation tank 1 in which this rectangular sedimentation tank scraping device 10 is installed, a pit 7 is formed in the center of the bottom part of the long side, and the sediment 6 is scraped from both ends toward the center. It's becoming like that.

For this purpose, rails 2 are laid on both sides above the bottom of the long sides of the sedimentation tank 1, and the wheels 3a of the traveling truck 3 are placed on the rails 2 so that it can travel.

This running bogie 3 runs on rails 2 and has side beams 3b parallel to the running direction to which front and rear wheels 3a are attached, and a sedimentation basin 1 connecting these side beams 3b. It is composed of a girder 3c and a wheel 3a.
In order to lengthen the wheelbase (distance between axle centers) A and prevent meandering, the length of the side beam 3b is made approximately equal to the distance B from the end of the sedimentation tank 1 to the opposite end of the pit 7, The size corresponds to about half of the bottom of sedimentation tank 1.

As shown in FIG. 2, guide rods 11 are attached to the front and rear parts of the lower side beams 3b on both sides of the traveling truck 3 in parallel with the traveling direction. Arm 12
A scraping plate 4 is provided at the lower end of the scraping plate arm 12 for scraping the sediment 6 into the pit 7 while sliding on the bottom of the sedimentation tank 1. The arrangement is such that when one scraping plate 4 is located at the end of the sedimentation basin 1, the other scraping plate 4 is located at the opposite end of the pit 7.

As shown in FIG. 3, these scraping plates 4 have
A rotating shaft is fixed to each end in the width direction, and this rotating shaft is rotatably supported at the lower end of the scraping plate arm 12, and the rotating shaft is connected to the scraping plate arm 12 and the rotating shaft. The rotation between them allows the scraping plate 4 to rotate between a scraping position shown by a solid line in FIG. 2 and a retracted position shown by a two-dot chain line in FIG.

In order to automatically rotate the scraping plate 4 by running the traveling cart 3, a scraping plate cam 13 is attached to the end of the rotation shaft outside the scraping plate arm 12. Scraping strikers 14 for operating the scraping plate cam 13 are attached to predetermined positions on both ends of the sedimentation basin 1 in the traveling direction, and evacuation strikers 15 are attached to predetermined positions of the pit 7.

In order to hold the raking plate 4 in the raking position and the retracted position, arms are attached to each rotating shaft so as to form a constant angle with the raking plate arm 12. A balance weight 16 arranged in the direction is attached.

The scraping plate 4 attached to the lower end of the scraping plate arm 12 is, for example, a flat plate 4a arranged in the width direction of the sedimentation tank 1, as shown enlarged in FIG. A combination of selenium 4b attached to the tip to dig up the precipitate 6, or a flat plate 4a alone are used.

The drive mechanism for driving the traveling carriage 3 and the scraping plate 4 uses a single wire 17 and connects it to the widthwise center portion of the traveling carriage 3, and connects this wire 17 with, for example, a wire. 17 is wound around a motor-driven take-up drum and a delivery drum installed at the top of the sedimentation tank 1, and is placed parallel to the rail 2 through sheaves installed at both ends of the sedimentation tank 1 in the running direction. , a wire 17 whose intermediate portion is hooked onto the traveling carriage 3 is used.

The meandering of the scraping plate 4 is prevented from occurring by the long wheelbase A of the traveling trolley 3, and even if driven by only one wire 17, the scraping plate 4 may be tilted or the traveling The sediment 6 can be collected without the wheels 3a of the truck 3 coming off.

Next, a raking operation using the raking device 10 for a rectangular sedimentation tank configured as described above will be explained based on FIG. 4.

For example, when scraping the sediment 6 from the right side of the sedimentation tank 1, the traveling cart 3 is first placed on standby at a scraping start position at the right end of the sedimentation tank 1.

In this state, the right-most raking board 4, which is at the rear of the vehicle during raking, is put into the raking state by the raking striker 14, and the left-most raking board 4, which is the front of the vehicle, is used for evacuation. It is in a retracted state by the striker 15 (see FIG. 4a).

Next, from this state, when winding the wire 17 and starting raking in the left direction, the sediment 6 is scraped up by the raking plate 4 at the right end at the rear of the traveling trolley 3, When the tip moves until it reaches the left end of the sedimentation tank 1, all the sediment 6 on the right side of the sedimentation tank 1 is collected into the pit 7 (Fig. 4b).
reference).

After this, when the wire 17 is further pulled, the scraping plate 4 at the right end of the traveling trolley 3 moves to the scraping plate cam 1.
The raking plate 4 at the left end is brought into the raking state by contacting the raking striker 15 of the raking plate cam 13 to the raking state. (see Figure 4c).

After the scraping plate 4 at the left end of the traveling truck 3 is in the scraping state, when the wire 17 is pulled to the right, the traveling truck 3 is moved to the right, and the sedimentation tank 1 is moved to the right.
The precipitate 6 on the left side is collected into the central pit 7 (see Figure 4d).

Thereafter, when the wire 17 is further pulled, the raking start state shown in FIG. 4a is returned again.

When the precipitate 6 is collected in this way,
By moving the traveling cart 3 back and forth over half the distance of the sedimentation pond 1, complete raking can be achieved.

In addition, the length of the traveling trolley 3 is set to correspond to the length from the end of the sedimentation tank 1 to the opposite edge of the pit 7, and each scraping plate 4 is set to correspond to the length from the end of the sedimentation tank 1 to the opposite edge of the pit 7. 7 and the wheel base A of the traveling trolley 3 is made long, so that meandering of the scraping plate 4 and derailment of the wheels 3a can be completely prevented.

Next, an example applied when the pit formed in the sedimentation basin is installed offset from the center will be explained using FIG. do.

In the sedimentation tank 1 of this embodiment, the pit 7 is provided closer to the right side, and the distances to the center of the pit 7 are L1 and L2 (L1<L2).

A running trolley 3 installed in such a sedimentation pond 1
In order to lengthen the wheelbase A and prevent meandering, the length of the side beam 3b is made approximately equal to the distance L1 from the end of the right side of the sedimentation tank 1 to the opposite end of the pit 7. It is large enough to cover the right side of sedimentation tank 1. When the traveling vehicle 3 is positioned on the right side, one of the scraping plates 4 attached to the front and rear of the traveling vehicle 3 is located on the right side of the sedimentation basin 1, and the other is located on the left side of the pit 7 (the end on the opposite side of the pit 7). ).

Note that the other configurations are the same as those of the previous embodiment.

The work of raking the sediment 6 using the raking device 10 for a rectangular sedimentation tank configured as described above is performed as follows.

For example, when scraping the sediment 6 from the right side of the sedimentation basin 1, the traveling carriage 3 is positioned at the right end of the sedimentation basin 1, then raking is started, and the running carriage 3 is moved by the wire 17. The process of running leftward and raking up the pit 7 is the same as in the previous embodiment.

After the sediment 6 on the right side of the sedimentation basin 1 has been scraped up (see Fig. 5b), when the carriage 3 is further moved slightly to the left, the scraping plate 4 on the right end of the carriage 3 is retracted. It is brought into a retracted state by the striker 15, and both scraping plates 4, 4 are brought into a retracted state.

From this state, the traveling cart 3 is further moved to the left and positioned at the left end of the sedimentation basin 1.

Then, this time, the scraping plate 4 on the left end of the traveling trolley 3
is brought into a raking state by the raking striker 14, and preparation for raking in the right direction is completed.

Therefore, in this state, the traveling trolley 3 is caused to travel rightward using the wire 17 to scrape the left portion of the sedimentation basin 1.

By repeating the movement of the traveling trolley 3 in this manner, the sediment 6 can be scraped up, and the traveling trolley 3 with a long wheel base A prevents meandering, and at the same time, the raking plate 4 on the rear side in the traveling direction can be scraped together. Since it is used to scrape together, it is possible to completely scrape without leaving any scraping.

Next, regarding an example applied when the pits formed in the sedimentation tank are installed at both ends,
This will be explained with reference to FIG. 6, and the same parts as in the previous embodiment are denoted by the same numbers and the explanation will be omitted.

In the sedimentation tank 1 of this embodiment, pits 7, 7 are provided at both left and right ends, and the capacity of each pit 7 is about half that of a single pit.

A running trolley 3 installed in such a sedimentation pond 1
In order to lengthen the wheelbase A and prevent meandering, the length of the side beam 3b is approximately equal to half the distance from one end of the sedimentation tank 1 to the other end, and the first It is approximately the same size as the traveling trolley 3 shown in the figure.

The scraping plates 4 attached to the front and rear of the traveling carriage 3 are different from those of the above embodiments, and the scraping plate arm 12 is arranged so that the scraping plate 4 is mounted on the front side of the traveling carriage 3 in the running direction. It is formed so as to face outward, and the mounting position of the scraping mechanism portion of the above embodiment is reversed.

Further, the scraping strikers 14 are provided outside the center of the sedimentation tank 1, and the retreating strikers 15 are provided at the ends of the pit 7.

Note that the other configurations are the same as in each of the embodiments described above.

The raking operation of the sediment 6 by the raking device 10 for a rectangular sedimentation tank configured as described above is carried out by raking the sediment 6 from the center of the sedimentation tank 1 so as to slightly overlap it from the outside and moving toward each pit 7. be exposed.

For example, when collecting sediment 6 that has settled on the left side of the center of the sedimentation tank 1 into the pit 7 at the left end, the left end of the traveling trolley 3 is positioned slightly to the right of the center of the sedimentation tank 1, and then , the front side of the traveling trolley 3,
That is, the scraping plate 4 at the left end is brought into a scraping state by the scraping striker 14.

After that, the traveling trolley 3 is moved to the left by the wire 17 to start raking, and the left pit 7
(See Figure 6a).

After scraping the sediment 6 on the left side of the sedimentation tank 1 in this way, when the traveling truck 3 is further moved slightly to the left, the scraping plate 4 at the left end of the traveling truck 3 is retracted by the retracting striker 15. state, and both scraping plates 4, 4 are in the retracted state.

Next, in this state, the traveling carriage 3 is caused to travel to the right by the wire 17 so that the right end of the traveling carriage 3 is slightly to the left of the center of the sedimentation basin 1.

Then, this time, the scraping plate 4 on the right end of the traveling trolley 3
is brought into a raking state by the raking striker 14, and preparations are made to scrape the sediment 6 that has settled on the right side of the center of the settling tank 1 into the pit 7 at the right end by moving the traveling trolley 3 to the right. is completed.

Therefore, in this state, the traveling trolley 3 is moved to the right by the wire 17, and the sediment 6 that has settled on the right side of the sedimentation tank 1 is transferred to the pit 7 at the right end.
(See Figure 6b).

By repeating such movement of the traveling trolley 3 with a slight overlap in the central part, the sediment 6 can be scraped up, and at the same time, meandering is prevented by the traveling trolley 3 having a long wheelbase A.
Since the scraping plate 4 on the front side in the running direction scrapes the pits 7 on both sides, it is possible to scrape completely without leaving any scraping.

In addition, in the above embodiment, a submerged type is used in which the traveling trolley is run in the treated water, but the present invention is not limited to this, and it is also possible to use an above-ground type in which the traveling trolley is placed on the ground and only the scraping board is placed in the water. .

[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 pit is formed in the middle of the rectangular sedimentation basin, and the running bogie is made longer in the running direction and scraping plates are attached to the front and rear of the bogie, so the long wheelbase of the running bogie prevents meandering. At the same time, by using the scraping board on the rear side in the traveling direction to scrape toward the center pit, it is possible to eliminate any scraping.

In addition, pits were formed at both ends of the sedimentation basin, and the running trolley was lengthened in the running direction and scraping plates were attached to the front and rear of the trolley.
The long wheelbase of the traveling truck prevents meandering, and the scraping plate on the front side in the traveling direction overlaps in the center of the sedimentation basin and scrapes toward the pits at both ends to remove scraping. It can be eliminated.

In either case, meandering can be prevented by the long wheel base of the traveling truck, so that the traveling truck can be driven with a single cable without causing wheels to come off.

[Brief explanation of drawings]

1 to 3 show an embodiment of a submerged type raking device for a rectangular sedimentation tank in which a pit is formed in the center of the sedimentation tank according to the present invention; FIG. 1 is an overall configuration diagram; FIG. 2 is a partially enlarged view of the traveling truck, FIG. 3 is a partial side view of the raking plate, FIG. Fig. 5 is an explanatory diagram of the configuration and raking work of another embodiment of the raking device for a rectangular sedimentation tank in which a pit is formed in the middle part of the sedimentation tank of the present invention, and Fig. 6 is an explanatory diagram of the raking operation of another embodiment of the raking device for a rectangular sedimentation tank in which a pit is formed in the middle part of the sedimentation tank of the present invention. An explanatory diagram of the configuration and raking work of yet another embodiment of a raking device for a rectangular sedimentation tank in which pits are formed at both ends of the pond, and FIG. 7 is an outline of the object to which this invention is applied and a conventional device. It is an explanatory diagram. 1: Sedimentation pond, 2: Rail, 3: Traveling trolley, 3
a: Wheel, 3b: Side beam, 3c: Girder,
4: Scraping board, 4a: Flat plate, 4b: Selenium, 6:
Sediment, 7: Pits, 10: Scraping device for rectangular sedimentation basin, 11: Guide rod, 12: Arm for scraping plate, 13: Cam for scraping plate, 14: Striker for scraping, 15: Striker for retreat , 16: Balance weight, 17: Wire.

Claims (1)

[Claims] 1. A pit is provided in the middle of a rectangular sedimentation tank, rails are laid on both sides of this sedimentation tank, and a running bogie with wheels on the front and rear parts of the side beams runs, and this running bogie In a raking device equipped with a raking plate that slides on the bottom of the sedimentation basin and scrapes sediment into the pit, the side beam of a traveling cart that runs from the edge of the sedimentation basin toward the pit and scrapes the sediment is connected to the bottom of the sedimentation basin. It is formed to have a length approximately equal to the shorter distance from the end to the opposite side of the pit, and wheels are attached to the front and rear parts of the pit, while the front and rear parts of the traveling bogie are brought into a scraping state, and the front part of the traveling vehicle is in a retracted state. A raking device for a rectangular sedimentation basin, characterized in that it is provided with a raking board for raking. 2. A rectangular sedimentation tank is equipped with pits at both ends, rails are laid on both sides of the sedimentation tank, and a running trolley with wheels mounted on the front and rear side beams is run, and the bottom of the settling tank is slid onto this running trolley. In a raking device equipped with a raking plate that moves to scrape sediment into a pit, the side beam of the traveling trolley that runs from the edge of the sedimentation basin toward the pit to scrape the sediment is placed at a distance approximately equal to the distance between both ends of the sedimentation basin. It is characterized in that it is formed to have a half length and wheels are attached to the front and rear parts thereof, and at the front and rear of the traveling bogie, scraping plates are provided to put the front part of the vehicle in a raking state and the rear part of the traveling part to be in a retracted state. A raking device for square sedimentation ponds.