KR102479199B1 - Sludge collection device - Google Patents

Abstract

An underwater trolley of a sludge collection device according to one embodiment of the present invention may comprise: a trolley body including wheels seated on a rail, a trolley frame where the wheels are installed, and a support installed on the trolley frame to move the trolley frame forward or backward by means of a driving wire; a first scraper installed on a front side terminal of the trolley frame to push sludge, rotating on the front side terminal when coming in contact with an overturn member installed on one side of a settling basin in approaching a discharge hopper disposed on one side of the settling basin, and installed to be spaced apart from a bottom of the settling basin; a second scraper installed rotatably on a rear side terminal of the trolley frame; and a scraper interlinking unit connected to each of rotational shafts of the first scraper and the second scraper to allow the second scraper to be in a scraping state when the first scraper is turned over and rotate and turn over the second scraper when the first scraper is returned to the scraping state, thereby spacing the second scraper apart from the bottom to be interlinked to reverse operation. Accordingly, an operational load is decreased and damage caused by friction is reduced.

Description

Sludge collection device {SLUDGE COLLECTION DEVICE}

The present invention relates to a sludge collection device, and more particularly, to a sludge collection device in which operating load is reduced and frictional damage is reduced.

In general, physical treatment, chemical treatment, biological treatment, etc. are used for the purification of wastewater at water purification plants or sewage treatment plants. A method of precipitating sludge and separating it from water is used.

As such, the sludge precipitated in the settling tank is transported by various types of sludge collection devices, put into the sludge discharge hopper, and then discharged to the outside through a discharge port formed at the lower end of the sludge discharge hopper by driving a discharge valve or a discharge pump.

The sludge collection device may be classified into a siphon type sludge collection device, a bridge travel type sludge collection device, an underwater bogie type sludge collection device, a chain flight type sludge collection device, a circular type sludge collection device, and the like.

For example, in Korean Utility Model Publication No. 20-0371397 (Sludge Collection Sludge for Preventing Rail Departure) (published on January 3, 2005), etc. The structure of the collection device is disclosed. This sludge collection device can remove sludge settled on the bottom surface of the settling tank.

The sludge collection device must be designed to operate satisfactorily under all changing conditions such as load, pressure, temperature, etc. that can occur during normal operation or under on-site weather conditions, and must not generate abnormal noise or vibration. It is desirable to supply and install equipment that has been tested for a long time and has a track record of continuous operation (more than one year). In addition, it is preferable to manufacture a structure that does not deviate from the rail or roll over during operation of the underwater bogie and install an overload safety device.

However, this sludge collection device is a heavy object made of metal, and a large load is applied to the rail, and a large power is required for a driving unit that drives it, so that a burden is placed on the driving unit, and a wire for operating the sludge collection device and a wire for supporting and fixing it A large load is continuously applied to the roller structure, support base, bolts and nuts. As a result, there are problems such as damage due to abrasion, damage at fastening parts such as bolt fastening, separation from rails, and shortened life span of driving parts.

A technical problem to be achieved by the present invention is to provide a sludge collection device in which operating load is reduced and frictional damage is reduced.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, an embodiment of the present invention provides a rail installed on the bottom of the settling pond, an underwater cart seated on the rail, a driving unit installed outside the settling pond, and a driving unit connecting the driving unit and the underwater cart. A sludge collection device comprising a wire is provided. The underwater bogie of the sludge collection device includes a wheel seated on the rail, a bogie frame on which the wheel is installed, and a support installed on the bogie frame to advance and reverse the bogie frame by a driving wire. bogie body; It is installed at the front end of the bogie frame and when approaching the discharge hopper provided on one side of the settling basin by pushing the sludge, rotates with respect to the front end while being in contact with the overturning member installed on one side of the settling basin, and is spaced apart from the bottom of the settling basin A first scraper installed to be; A second scraper rotatably installed at the rear end of the bogie frame; And connected to each rotation shaft of the first scraper and the second scraper, when the first scraper overturns, the second scraper makes the scraping state, and when the first scraper recovers to the scraping state, the It may include; a scraper interlocking part that rotates and overturns the second scraper to separate it from the floor and interlocks it in a reverse operation.

In an embodiment of the present invention, a buoyancy body receiving buoyancy from the water of the settling pond and being connected to the balance frame may further include a buoyancy body reducing a force applied to the rail by the balance frame.

In an embodiment of the present invention, the settling basin includes a first settling basin and a second settling basin in which the underwater bogie and the buoyancy body are installed, respectively, and the driving wire forms a closed curve, and the underwater cart and the second settling basin form a closed curve. It is connected to the underwater balance of the settling basin, and the underwater balance of the first settling basin and the underwater balance of the second settling basin may be driven to move in opposite directions by the driving unit and the driving wire.

In an embodiment of the present invention, the scraper interlocking part may include: a first roller installed on the bogie frame obliquely below the rotating shaft of the first scraper; a second roller installed on the bogie frame obliquely above the rotating shaft of the second scraper; and an interlocking wire connecting the rotating shaft of the first scraper, the first roller, the second roller, and the rotating shaft of the second scraper to implement the reverse operation.

In an embodiment of the present invention, the rail includes a wheel seating portion on which the wheel is seated, and a hooking portion extending from an outer surface of the wheel seating portion, and the bogie frame is in contact with a lower surface of the hanging portion to maintain the buoyancy body. An anti-separation unit may be provided to prevent the wheel of the bogie frame from being separated from the rail due to buoyancy.

In an embodiment of the present invention, the buoyancy body may be mounted on an upper surface of the bogie frame.

In an embodiment of the present invention, the buoyancy body floats on the surface of the water of the settling pond and may be connected to the bogie body by a connecting rope.

In an embodiment of the present invention, it is installed on the buoyancy body and is connected to the connecting rope, and may further include a tension holding unit for maintaining the tension of the connecting rope within a certain range even when the height of the water surface is changed.

In an embodiment of the present invention, the wheel seating portion of the rail is formed in a groove shape into which the rail is inserted, the locking portion protrudes horizontally from an outer surface of the wheel seating portion, and the separation prevention portion moves downward from the bogie frame. It may include an extending vertical portion and a horizontal portion extending horizontally from the vertical portion and positioned below the hanging portion.

In an embodiment of the present invention, a rail groove in which a rail is installed is formed at the bottom of the settling tank, a sub groove is formed sideways from an upper end of the rail groove, and the hooking part of the rail is positioned in the sub groove to make the first step. When the first scraper and the second scraper scrape the floor, interference with the hooking portion may be prevented.

According to an embodiment of the present invention, it is possible to provide a sludge collection device in which operation load is reduced, frictional damage is reduced, and damage or overload of parts is prevented so that operation is easy and life is extended.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 to 3 are photographs for explaining a sludge collection device according to an embodiment of the present invention.
4 and 5 are views showing a sludge collection device according to an embodiment of the present invention.
6 and 7 are views for explaining an underwater vehicle of the sludge collection device according to an embodiment of the present invention.
FIG. 8 is a view showing an example of a cross section taken along line “AA” shown in FIG. 7 .
9 is a view showing a sludge collection device according to another embodiment of the present invention.

Since the present invention may have various changes and various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, it should be understood that this is not intended to limit the present invention to the specific disclosed form, and includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 to 3 are pictures for explaining a sludge collection device 10 according to an embodiment of the present invention. 4 and 5 are views showing a sludge collection device 10 according to an embodiment of the present invention. 6 and 7 are views for explaining the underwater cart 400 of the sludge collection device according to an embodiment of the present invention.

The sludge collection device 10 of the present embodiment includes a rail 100 installed on the bottom 20 of the settling pond, a driving unit 200 installed outside the settling pond, an underwater cart 400 seated on the rail 100, and a driving unit ( 200) and a driving wire 300 connecting the underwater cart 400.

The driving unit 200 may include a driving motor 210 , a rotating shaft 220 and a rotating drum 230 . The drive wire 300 is wound around the rotating drum 230 and may be connected to the underwater carts respectively located in the first settling basin and the second settling basin in a closed curve shape.

The drive motor 210 is installed on one side of the settling pond and can generate rotational driving force. In addition, the rotating shaft 220 is connected to the rotating shaft of the driving motor 210 and is vertically disposed from the water surface to the bottom 20 on one side of the sedimentation basin, and can transmit the rotational driving force generated from the driving motor 210. there is. The rotary drum 230 is coupled to the rotary shaft 220 at a position adjacent to the bottom 20 of the settling basin, and tows the drive wire 300 connected to each of the at least one underwater bogie 400 in a wound state to at least one Each of the underwater carts 400 can be reciprocally driven.

The underwater cart 400 may include a bogie body 410, a first scraper 420, a second scraper 430, and a scraper linkage 440.

The bogie body 410 moves the bogie frame 412 forward and backward by a wheel 411 seated on the rail 100, a bogie frame 412 on which the wheel 411 is installed, and a drive wire 300. A support 413 installed on the bogie frame 412 may be included.

The first scraper 420 is installed at the front end of the bogie frame 412 and pushes the sludge, and when approaching the discharge hopper 50 provided on one side of the settling pond, it contacts the overturning member 70 installed on one side of the settling pond and moves the front It is rotated with respect to the stage and may be installed to be spaced apart from the bottom 20 of the settling basin. The second scraper 430 may be rotatably installed at the rear end of the bogie frame 412 .

The scraper interlocking part 440 may be connected to each rotation shaft of the first scraper 420 and the second scraper 430 . The scraper interlocking part 440 makes the second scraper 430 into a scraping state when the first scraper 420 overturns, and when the first scraper 420 recovers to the scraping state, the second scraper 430 ) can be separated from the bottom 20 by overturning the rotation. That is, the scraper interlocking unit 440 may interlock the first scraper 420 and the second scraper 430 in reverse operation. The scraper linkage 440 includes a first roller 441 installed on the truck frame 412 below the rotation axis of the first scraper 420 in an oblique direction and an oblique direction above the rotation axis of the second scraper 430. The second roller 442 installed on the 412, the rotational axis of the first scraper 420, the rotational axis of the first roller 441, the second roller 442, and the second scraper 430 are connected to reverse operation. It may include an interlocking wire 443 that implements.

The sludge collection device 10 can be operated manually or automatically. As an example of the operation method, the underwater cart 400 is a drive wire in which the first bogie (underwater bogie of the first settling basin) and the second bogie (underwater bogie of the second settling basin) form a closed curve in front of the settling pond sludge hopper 50 ( 300) connected to each other in each settling tank and operating (ON), the first trolley pushes the sludge accumulated on the bottom 20 of the settling tank with the first scraper 420 and advances toward the hopper, and the second trolley moves forward toward the hopper (420) reverses in an overturned state. When the first bogie is located 1~2m before the hopper, the proximity switch for valve OPEN operates and sends a detection signal to the central control panel. When the first bogie continues to move forward and reaches the front of the hopper 50, the first scraper 420 is overturned by the overturning member 70 (see FIG. 7), and the overturned first scraper 420 moves forward so that the hopper 50 ), when the proximity S/W for stopping the bogie is operated from the front, the first bogie is stopped. At this time, the first bogie stops for a certain period of time (the time set by the timer) until the discharge of the sludge collected in the hopper is finished, and then operates again, so that the first bogie moves backward and the second bogie moves forward. . Similarly to the first bogie, the second bogie also operates the proximity S/W for valve OPEN and the proximity S/W for stopping the bogie. At this time, when the first scraper 420 is erected again by the scraper overturning member 80 at the reverse completion part of the first bogie and the forward movement of the second bogie is stopped, the backward movement of the first bogie is stopped. This reciprocating motion is called 1 cycle (CYCLE), and the stop time for each cycle can wait for the stop for the time set in the timer. Operation that continues this cycle is referred to as automatic operation, and manual operation is to manually operate each operation of the bogie. Therefore, manual operation is operated during test operation or inspection and maintenance, and it is mainly operated automatically.

The sludge collection device 10 of this embodiment may further include a buoyancy body 500. In this embodiment, the buoyancy body 500 may be mounted on the upper surface of the truck frame 412. The buoyancy body 500 receives buoyancy from the water of the settling pond and is connected to the truck frame 412 to reduce the force applied to the rail 100 by the truck frame 412. That is, the underwater cart 400 may be a heavy object made of a metal material, and a large load is applied to the drive unit 200 and the drive wire 300 in order for the underwater cart 400 to move on the rail 100, and the rail ( 100) is also severe. Specifically, the force applied during driving of the bogie, the force applied to the wire pulley, the tension in the drive wire 300, the power required for drum rotation of the drive unit 200, the power of the motor, the shear stress applied to the shear pin, etc. The frictional force between the rail 100 and the wheel 411 due to the load of the underwater bogie 400 has a great effect. As a result, the driving power of the underwater bogie 400 itself is greatly required, overloading occurs in some cases, and wear or damage of the rail 100 and the wheel 411 becomes a problem during long-term use, and the drive unit 200 or the drive Damage and deterioration of the connecting members of the wire 300 due to continuous large loads shorten the life of the device, and a lot of time and money are required to repair it.

In this embodiment, the buoyancy body 500 is installed on the bogie frame 412 to receive buoyancy in the water, and to apply force to the underwater bogie 400 upward. Therefore, a force obtained by subtracting buoyancy from the load of the underwater cart 400 is applied to the rail 100, and frictional force is reduced. Therefore, the forward and backward motion of the underwater cart 400 becomes easier, less driving force is required, and the load applied to members such as the drive wire 300 support base and bolts is reduced, and as a result, the sludge collection device ( 10) becomes easier to drive, and the life of the device is extended because damage or deterioration due to fatigue stress of each part or member is slowed down.

The buoyancy body 500 may be a plastic or metal tank with an empty inside. Alternatively, it may be a member made of a material such as Styrofoam. The buoyant agent may be coupled to the truck frame 412 by means such as fastening means or ropes. The volume of the buoyancy body 500 can be selected to such an extent that the wheel 411 of the underwater bogie 400 does not depart from the rail 100. The volume of the buoyant body can be determined by knowing the load of the underwater bogie 400 and calculating the necessary buoyancy. In the case of the tank-shaped buoyancy body 500, the size of the buoyancy may be adjusted by partially filling the inside with water.

The settling basin 11 may include a first settling basin and a second settling basin in which the underwater cart 400 and the buoyancy body 500 are respectively installed. The drive wire 300 forms a closed curve and may be connected to the underwater cart 400 of the first settling basin and the underwater cart 400 of the second settling basin. The underwater cart 400 of the first settling basin and the underwater cart 400 of the second settling tank may be driven to move in opposite directions by the driving unit 200 and the driving wire 300.

FIG. 8 is a view showing an example of a cross section taken along line “A-A” shown in FIG. 7 .

Although the underwater bogie 400 is forced upward by the buoyancy body 500, the buoyancy body 500 may be selected so that the wheel 411 maintains contact with the rail 100. However, the underwater cart 400 of this embodiment may have a special structure in which the wheel 411 is not separated from the rail 100 even when the underwater cart 400 receives force upward due to the buoyancy body 500.

Specifically, as shown in FIG. 8 , the rail 100 includes a wheel seating portion 110 on which a wheel 411 is seated, and a locking portion 120 extending from an outer surface of the wheel seating portion 110. can do. The balance frame 412 is provided with a separation preventing portion 4121 that contacts the lower surface of the hanging portion 120 and prevents the balance frame 412 from being separated from the rail 100 due to the buoyancy of the buoyancy body 500. can For example, the wheel seating portion 110 of the rail 100 may be formed in a groove shape into which the rail 100 is inserted, and the locking portion 120 may protrude horizontally from an outer surface of the wheel seating portion 110. there is. The separation preventing part 4121 may include a vertical part extending downward from the truck frame 412 and a horizontal part extending horizontally from the vertical part and positioned below the hooking part 120 .

A rail groove 30 in which the rail 100 is installed may be formed on the bottom 20 of the settling basin. A sub-groove 40 is formed from the upper end of the rail groove 30 to the side, and the hanging part 120 of the frame may be positioned in the sub-groove 40 . Therefore, when the first scraper 420 and the second scraper 430 scrape the floor 20, there is no interference with the hanging part 120.

Since buoyancy is applied upward to the underwater bogie 400 by the buoyancy body 500, the frictional force between the rail 100 and the wheel 411 is significantly reduced, reducing the power required for forward and backward driving, and driving unit 200 and Stress applied to the driving wire 300, the support, and the like can be significantly reduced. In addition, even if the wheel 411 is unexpectedly separated from the rail 100 due to buoyancy, the detachment of the wheel 411 can be prevented by the separation preventing part 4121 being caught on the hooking part 120 .

9 is a view showing a sludge collection device 10 according to another embodiment of the present invention.

In the embodiment shown in FIG. 9 , the buoyancy body 500 floats on the water surface 12 of the settling pond and may be connected to the truck frame 412 by a connection rope 550. The buoyancy body 500 may be pulled down by the connection rope 550 so that a part thereof is submerged in water. Therefore, the underwater cart 400 can receive the tension of the connecting rope, that is, the buoyancy of the buoyancy body 500. When the height of the water surface changes, in order to prevent the tension of the connecting rope 550 from being changed, the buoyancy body 500 may be provided with a tension holding unit 600. The tension holding unit 600 may be, for example, a rope winding device. The tension maintaining unit 600 is installed on the buoyancy body 500 and connected to the connection rope, and can change the length of the connection rope to maintain the tension of the connection rope within a certain range even when the height of the water surface 12 is changed.

Hereinafter, an example of the operation of the control panel of the sludge collection device will be described.

The operation preparation of the sludge collection device can be done as follows.

1) Check if the POWER LAMP on the front of the panel is turned on (when turned on, you can see that power is being transmitted to the panel).

2) Turn on the MAIN N.F.B on the top left inside the PANEL.

3) Using V-METER and V-SWITCH, check whether there is an abnormality in the 3-phase voltage.

4) After confirming that there is no abnormality, turn on the remaining N.F.B.

Operation of the operation panel (PANEL) for driving can be completed by the same operation. Unless there is a special reason, you can always maintain this state even when you are not driving. In particular, it is preferable not to arbitrarily manipulate the counter for displaying the position of the bogie and to be careful not to cut off the power when the bogie is operating. A memory device for power failure compensation can be built inside the COUNTER, and can be used for 2,400 hours when continuously charged for 100 hours.

In the case of the embodiment shown in FIG. 9, the buoyancy body 500 may function as a position display unit displaying the position of the underwater cart 400. Therefore, it is possible to refer to the position of the buoyancy body when preparing for operation.

After preparing for operation as described above, manual operation can be performed as follows.

1) If you press the push button switch (SWITCH) for auto-manual selection on the operation panel, the automatic operation lamp turns off.

2) Check if the push button switch for water withdrawal V/V is closed and the lamp is turned on.

3) Drive motor (DRIVE MOTOR) operation switch of the driving part to operate the forward (FORWARD) and reverse (REVERSE) operation of the underwater cart. For example, in the case of forward movement, the right trolley moves in the far direction from the control panel toward the settling pond, and in the case of backward movement, it may move in the opposite direction. As described above during this driving, the frictional force between the rail and the wheel of the underwater cart is reduced by the buoyancy body, so that the size of the driving force for driving is small. In addition, in the case of an embodiment in which the buoyancy body floats on the surface of the water, the moving position of the underwater cart can also be visually confirmed.

After one manual operation, most of them can be operated automatically as follows.

1) It can be operated by the program installed inside the operation panel for automatic operation.

2) After completing the inspection of the relay, press the automatic selection push button SWITCH and press the automatic start push button SWITCH to operate automatically.

3) Check whether 1 cycle operates normally during automatic operation.

As described above, the sludge collection device is operated manually and automatically, but it is preferable to periodically perform preventive inspections as follows.

The sludge collection device of this embodiment is operated automatically according to the turbidity of the raw water flowing into the settling tank seasonally (stop time adjusted for each cycle by the timer) or manually operated in some cases, but it is mainly set to automatic operation, and the turbidity is small Even in winter, it is desirable to operate automatically by setting the timer once a day (1 CYCLE) to prevent poor rotation and poor lubrication of each part.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

10: sludge collection device
20: floor
30: rail home
40: sub home
100: rail
110: wheel seating part
120: hanging part
200: driving unit
210: drive motor
300: drive wire
400: underwater bogie
410: bogie body
411: wheel
412: bogie frame
4121: separation prevention unit
413: support
420: first scraper
430: second scraper
440: scraper linkage
441: first roller
442: second roller
443: interlocking wire
500: buoyancy body
600: tension maintaining unit

Claims (10)

In the sludge collection device including a rail installed on the bottom of the settling tank, an underwater cart seated on the rail, a drive unit installed outside the settling tank, and a drive wire connecting the drive unit and the underwater cart, the underwater cart ,
A bogie body including a wheel seated on the rail, a bogie frame on which the wheel is installed, and a support installed on the bogie frame to move the bogie frame forward and backward by a driving wire;
It is installed at the front end of the bogie frame and when approaching the discharge hopper provided on one side of the settling basin by pushing the sludge, rotates with respect to the front end while being in contact with the overturning member installed on one side of the settling basin, and is spaced apart from the bottom of the settling basin A first scraper installed so as to;
A second scraper rotatably installed at the rear end of the bogie frame; and
It is connected to each rotation shaft of the first scraper and the second scraper, and when the first scraper overturns, the second scraper makes a scraping state, and when the first scraper recovers to a scraping state, the first scraper 2 a scraper interlocking unit that rotates and overturns the scraper to separate it from the floor and interlocks it in a reverse operation;
Further comprising a buoyancy body that receives buoyancy from the water of the settling basin and is connected to the balance frame to reduce the force applied to the rail by the balance frame,
The scraper interlocking part,
A first roller installed on the bogie frame obliquely below the rotating shaft of the first scraper;
a second roller installed on the bogie frame obliquely above the rotating shaft of the second scraper; and
Characterized in that, the sludge collection device comprises a; interlocking wire for connecting the rotating shaft of the first scraper, the first roller, the second roller and the rotating shaft of the second scraper to implement the reverse operation.
delete The method of claim 1,
The settling basin includes a first settling basin and a second settling basin in which the underwater cart and the buoyancy body are respectively installed,
The drive wire forms a closed curve and is connected to the underwater cart of the first settling tank and the underwater cart of the second settling tank,
The sludge collection device, characterized in that the underwater balance of the first settling basin and the underwater balance of the second settling basin are driven to move in opposite directions by the driving unit and the driving wire.
delete The method of claim 1,
The rail includes a wheel seating portion on which the wheel is seated, and a hooking portion extending from an outer surface of the wheel seating portion,
The sludge collection device, characterized in that the bogie frame is provided with a separation preventing portion that contacts the lower surface of the hanging portion and prevents the wheel of the bogie frame from being separated from the rail due to the buoyancy of the buoyancy body.
The method of claim 5,
The sludge collection device, characterized in that the buoyancy body is mounted on the upper surface of the bogie frame.
The method of claim 5,
The sludge collection device, characterized in that the buoyancy body floats on the surface of the water of the settling tank and is connected to the bogie body by a connecting rope.
The method of claim 7,
The sludge collection device, which is installed on the buoyancy body and is connected to the connection rope, characterized in that it further comprises a tension holding unit for maintaining the tension of the connection rope within a certain range even when the height of the water surface is changed.
The method of claim 5,
The wheel seating portion of the rail is formed in a groove shape into which the rail is inserted, the locking portion protrudes horizontally from an outer surface of the wheel seating portion, and the separation preventing portion includes a vertical portion extending downward from the bogie frame and the vertical portion. Sludge collection device characterized in that it comprises a horizontal portion extending horizontally from and positioned below the hanging portion.
The method of claim 9,
A rail groove in which a rail is installed is formed at the bottom of the sedimentation tank, a sub groove is formed sideways from an upper end of the rail groove, and the hooking part of the rail is located in the sub groove so that the first scraper and the second scraper are Sludge collection device, characterized in that when scraping the floor, interference with the hooking portion is prevented.

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