CN220802051U - Mud scraping device for sludge concentration tank - Google Patents

Abstract

The utility model relates to the technical field of sewage treatment devices, in particular to a sludge scraping device for a sludge concentration tank, which comprises a driving motor, a central transmission shaft, a sludge scraping mechanism and a stirring mechanism. The mud scraping mechanism comprises two groups of inclined arms symmetrically arranged on two sides of the central transmission shaft, a plurality of mud scraping plates are fixed below each group of inclined arms, each mud scraping plate is attached to the bottom wall of the sludge concentration tank, a plurality of groups of concentration grid bars are fixed above each group of inclined arms, two groups of transverse arms are symmetrically fixed on two sides of the central transmission shaft and fixedly connected with the concentration grid bars, and the transverse arms are fixed with the central transmission shaft through connecting at least two pull rods. The stirring mechanism is arranged in a sludge collecting groove at the bottom of the sludge concentration tank, and driven by the driving motor, and the sludge scraping mechanism and the stirring mechanism realize synchronous rotation with the central transmission shaft. The mud scraping device disclosed by the utility model has high mud cleaning efficiency, and can effectively solve the technical problems of high mud scraping resistance, short service life and low mud scraping and discharging efficiency of the existing mud scraper for the concentration tank.

Description

Mud scraping device for sludge concentration tank

Technical Field

The utility model relates to the technical field of sewage treatment devices, in particular to a sludge scraping device for a sludge concentration tank.

Background

In the wastewater treatment process, urban wastewater treatment plants and industrial wastewater treatment stations often carry out wastewater treatment in a mode of combining a physical and chemical method with a biological method. The central transmission mud scraper is common environmental protection equipment for sewage treatment, is commonly used in sewage treatment tanks such as a primary sedimentation tank, an air floatation tank, a sludge concentration tank and the like, sewage containing sludge flows into the concentration tank, along with the reduction of flow velocity, the sludge in the sewage is settled at the bottom of the concentration tank, supernatant fluid flows out of a water tank through an overflow weir plate and is discharged out of the tank, and mud is scraped by a mud scraper at the bottom of the mud scraper and conveyed to a mud discharging port in the middle of the bottom to finish subsequent mud discharging work.

In the current sludge concentration pond, the common central transmission mud scraper is in the during operation, is located the mud scraping plate and the laminating of concentrated tank wall of concentrated pond bottom for the in-process of mud concentration pond central transmission mud scraper at rotatory stirring mud, easily because of the mud of concentrated pond bottom bonding piece, lead to mud scraping mechanism rotatory to be hindered, influence follow-up mud stirring work's normal clear, reduced mud concentration efficiency, and the mud that bonds the piece blocks mud scraping mechanism's global rotation, lead to driving motor damage and increase energy consumption easily, reduce its life. In addition, the sludge entering the sludge collection groove at the bottom of the concentration tank is high in viscosity and easy to agglomerate, and a sludge discharge pipe is easy to be blocked when sludge is discharged through a sludge discharge pump or by means of liquid level pressure difference, or the pressure of a pump set is increased, so that the sludge discharge efficiency is influenced.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model aims to provide a sludge scraping device for a sludge concentration tank, which has high sludge cleaning efficiency, avoids sludge agglomeration at the bottom of the concentration tank and improves sludge discharge efficiency. The utility model can effectively solve the technical problems of large mud scraping resistance, short service life and low mud scraping and discharging efficiency of the existing mud scraper for the concentration tank.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

In one technical scheme of the utility model, a sludge scraping device for a sludge concentration tank is provided, and is vertically arranged in the sludge concentration tank, and comprises a driving motor, a central transmission shaft, a sludge scraping mechanism and a stirring mechanism, wherein the driving motor is in transmission connection with the central transmission shaft, the sludge scraping mechanism is arranged in the middle of the central transmission shaft, and the stirring mechanism is sleeved at the lower part of the central transmission shaft;

The mud scraping mechanism comprises two groups of inclined arms symmetrically fixed on two sides of a central transmission shaft, a plurality of mud scraping plates are fixedly connected below each group of inclined arms, each mud scraping plate is attached to the bottom wall of the sludge concentration tank, a plurality of groups of concentration grid bars are fixedly connected above each group of inclined arms, two groups of transverse arms are symmetrically fixed on two sides of the central transmission shaft, the transverse arms are fixedly connected with the concentration grid bars, and the upper parts of each group of transverse arms are connected with the central transmission shaft through connecting at least two pull rods;

the stirring mechanism is arranged in a sludge collecting groove at the bottom of the sludge concentration tank, and driven by the driving motor, and the sludge scraping mechanism, the stirring mechanism and the central transmission shaft realize synchronous rotation.

Through setting up synchronous pivoted center transmission shaft, mud scraping mechanism and rabbling mechanism, under driving motor's driving effect, mud scraping mechanism and rabbling mechanism rotate along with center transmission shaft is synchronous, scrapes the mud of depositing on the diapire of mud concentration tank through the mud scraping plate and collects, makes it collect to the mud groove of collection along the diapire in, carries out synchronous stirring to the mud in the mud groove of collection through the rabbling mechanism, avoids its deposit caking and is difficult to the pump drainage. Through setting up concentrated grid can be along with the synchronous rotation of central transmission shaft, provide the sediment space of flocculent mud during the rotation, the decline of mud is accelerated, reduces and scrapes mud resistance, avoids increasing the mud degree of difficulty of scraping because of mud deposit caking, improves concentrated effect.

In some possible embodiments, the bottom wall of the sludge concentration tank is in a conical structure, an included angle between the bottom wall and the side wall of the sludge concentration tank is 100-150 degrees, so that sludge can be conveniently collected along the bottom wall to a middle sludge collecting groove, the inclined arm is parallel to the bottom wall of the sludge concentration tank, and a mud scraping plate is conveniently installed to be parallel to the bottom wall so as to improve mud scraping efficiency.

In some possible embodiments, an included angle of 20-80 degrees is formed between the working surface on the front side of each mud scraping plate and the bottom surface of the mud scraping plate, the bottom surface is attached to the bottom wall of the sludge concentration tank, and an included angle of 10-60 degrees is formed between the axial direction of each mud scraping plate and the long end direction of the inclined arm. By arranging the inclined working surface on the mud scraping plate, the problem that mud cannot be scraped effectively due to mud caking is avoided, the mud scraping efficiency of the mud scraping plate can be improved, the mud scraping resistance of the mud scraping plate in the rotation process is reduced, the energy consumption of a driving motor is reduced, and the service life of the mud scraping plate is prolonged; the mud scraping plates and the long end directions of the inclined arms are obliquely arranged, so that the contact area of the mud scraping plates and the mud can be increased, the mud scraping efficiency is improved, the mud is converged towards the mud collecting groove in the center, the mud scraping resistance can be reduced, and a certain escaping space is increased for the water flow in the mud.

In some possible embodiments, the mud scraping plate on the inclined arm on one side of the central transmission shaft and the mud scraping plate on the inclined arm on the other side of the central transmission shaft are symmetrically distributed by taking the axle center of the central transmission shaft as the center, and in the process of driving the central transmission shaft to rotate by the driving motor, the mud scraping mechanisms on the left side and the right side can improve the mud scraping effect, can play a role of gravity balance and improve the mechanical stability of the mud scraping device.

In some possible embodiments, a steady flow cylinder is further arranged above the mud scraping mechanism, the steady flow cylinder is sleeved outside the central transmission shaft, a working bridge is fixedly arranged above the sludge concentration tank, and the steady flow cylinder is fixedly connected with the working bridge;

the upper part of the side surface of the sludge concentration tank is penetrated with a sewage inlet pipe, the side surface of the steady flow cylinder is provided with a water inlet, and the sewage inlet pipe is penetrated with the water inlet.

Sewage flows into the steady flow cylinder through the sewage inlet pipe and the water inlet, so that the direction of the sewage entering the sludge concentration tank is changed, the water flow speed is reduced, the sludge settling time is prolonged, and the sludge settling effect is improved.

In some possible embodiments, the inner sleeve is sleeved with the inner sleeve, the inner sleeve is sleeved with the outer part of the central transmission shaft, the inner diameter of the inner sleeve is not smaller than the outer diameter of the central transmission shaft, a plurality of shunt ports are formed in the bottom of a cavity formed between the steady flow cylinder and the inner sleeve, sewage flows in from the water inlet and then flows out in a dispersing manner through the shunt ports to enter the sludge concentration tank, the flow rate of the sewage is reduced, the direction of the sewage entering the sludge concentration tank is changed, the detention time of the sewage in the sludge concentration tank is prolonged, and the sedimentation effect of the sludge in the sewage is improved.

In some possible embodiments, the driving motor is fixed on the working bridge, and a sludge discharge pipe and a sludge discharge pump are communicated with the side surface of the sludge collection tank, and the sludge in the sludge collection tank is pumped into a subsequent sludge concentration tank through the sludge discharge pipe by the operation of the sludge discharge pump.

In some possible embodiments, the lower part of the central transmission shaft is provided with a connecting shaft, the stirring mechanism is sleeved outside the connecting shaft and forms non-rotating connection with the connecting shaft, and the stirring mechanism is driven to synchronously rotate together when the driving motor drives the central transmission shaft to rotate, so that sludge in the sludge collecting tank is stirred, caking of the sludge is avoided, and sludge discharging efficiency is improved. The bottom of connecting axle is connected with spacing bearing, and spacing bearing is located the below of rabbling mechanism and carries out spacingly to it, and spacing bearing rotates the bottom of installing in album mud groove.

In some possible embodiments, the stirring mechanism comprises a stirring sleeve sleeved outside the connecting shaft, stirring rods distributed on the outer side surface of the stirring sleeve and dispersing blocks distributed on the outer surface of the stirring rods, and the stirring mechanism is used for improving the effect of stirring and dispersing sludge.

In some possible embodiments, the length of the stirring rod at the lower part of the stirring sleeve does not exceed the length of the stirring rod at the upper part of the stirring sleeve, and is matched with the structure of the funnel-shaped mud collecting groove.

The beneficial effects of the utility model are as follows:

The sludge scraping device for the sludge concentration tank has the advantages of high sludge cleaning efficiency, long service life, small sludge scraping resistance and low energy consumption, can avoid sludge agglomeration at the bottom of the concentration tank, and improves sludge discharge efficiency. According to the sludge scraping device, the sludge scraping mechanism and the stirring mechanism are driven by the driving motor to synchronously rotate, deposited sludge on the bottom wall of the sludge concentration tank is scraped and collected by the sludge scraping plate, the deposited sludge is collected into the sludge collecting tank along the bottom wall, the sludge in the sludge collecting tank is synchronously stirred by the stirring mechanism, the deposited and agglomerated sludge is prevented from being difficult to pump and discharge, the separation of the sludge and water flow is realized by arranging the concentration grid bars, the sludge scraping resistance is reduced, and the sludge scraping efficiency is improved.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic view showing the installation of a sludge scraping device for a sludge concentrating tank in the sludge concentrating tank according to the present utility model;

FIG. 2 is a schematic perspective view of a sludge scraping device for a sludge concentrating tank according to the present utility model;

FIG. 3 is a schematic view showing another perspective structure of a sludge scraping device for a sludge concentrating tank according to the present utility model;

FIG. 4 is a schematic view showing a construction of a sludge scraping device for a sludge concentrating tank according to the present utility model;

FIG. 5 is a plan view of a sludge scraping apparatus for a sludge concentrating tank according to the present utility model;

fig. 6 is a cross-sectional view taken along line "A-A" in fig. 5.

The reference numerals in the figures illustrate: 1. a driving motor; 2. a central transmission shaft; 3. a mud scraping mechanism; 31. an oblique arm; 32. a mud scraping plate; 321. a working surface; 322. a bottom surface; 33. concentrating the grid bars; 34. a transverse arm; 35. a pull rod; 4. a stirring mechanism; 41. a stirring sleeve; 42. a stirring rod; 43. dispersing blocks; 5. a steady flow cylinder; 51. a water inlet; 52. an inner sleeve; 53. a shunt port; 6. a connecting shaft; 7. a limit bearing; 100. a sludge concentration tank; 101. a sewage inlet pipe; 200. a mud collecting groove; 300. a working bridge; 400. a mud pipe; 500. a mud pump; 600. a supernatant outlet; 700. clear water temporary storage pool; 800. and overflow weir.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation.

In the description of the present embodiment, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front", "rear", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience in describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element referred to has a specific direction, is configured and operated in a specific direction, and therefore, should not be construed as limiting the present utility model.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, in one embodiment of the present utility model, a sludge scraping device for a sludge concentration tank is provided, which is vertically established inside a sludge concentration tank 100. The bottom of the sludge concentration tank 100 in this embodiment is provided with a sludge collecting tank 200, and a working bridge 300 crossing the sludge concentration tank 100 is fixedly arranged at the upper port of the sludge concentration tank 100. The side surface of the sludge collecting tank 200 is communicated with a sludge discharge pipe 400 and a sludge discharge pump 500, and the sludge in the sludge collecting tank 200 is pumped into a subsequent sludge concentration tank through the sludge discharge pipe 400 by the operation of the sludge discharge pump 500. A supernatant outlet 600 is formed in the side surface of the top of the sludge concentration tank 100, a circle of clear water temporary storage tank 700 is arranged in the inner ring of the top of the sludge concentration tank 100, an overflow weir 800 is arranged between the clear water temporary storage tank 700 and the sludge concentration tank 100, sludge in sewage is deposited and collected in the bottom sludge collecting tank 200, and supernatant overflows into the clear water temporary storage tank 700 through the overflow weir 800 and flows out to a next treatment device through the supernatant outlet 600.

As shown in fig. 1 and 2, the sludge scraping device for the sludge concentration tank in this embodiment includes a driving motor 1, a central driving shaft 2, a sludge scraping mechanism 3 and a stirring mechanism 4, wherein the driving motor 1 is fixed on a working bridge 300, the driving motor 1 is synchronously connected with the central driving shaft 2, the sludge scraping mechanism 3 is arranged in the middle of the central driving shaft 2, the stirring mechanism 4 is sleeved on the lower part of the central driving shaft 2, and the stirring mechanism 4 is arranged in a sludge collecting tank 200 at the bottom of the sludge concentration tank 100. The mud scraping mechanism 3 and the stirring mechanism 4 are driven by the driving motor 1 to synchronously rotate with the central transmission shaft 2.

Specifically, referring to fig. 1 to 3, the mud scraping mechanism 3 includes two sets of inclined arms 31 symmetrically fixed to both sides of the central transmission shaft 2, and a plurality of mud scraping plates 32 are fixedly connected below each set of inclined arms 31. Each scraper 32 is attached to the bottom wall of the sludge concentration tank 100, a plurality of groups of concentration grid bars 33 are fixedly connected above each group of inclined arms 31, two groups of transverse arms 34 are symmetrically fixed on two sides of the central transmission shaft 2, the transverse arms 34 are fixedly connected with the concentration grid bars 33, and the upper part of each group of transverse arms 34 is connected with the central transmission shaft 2 through at least two connecting rods 35.

Referring to fig. 1, the bottom wall of the sludge concentration tank 100 has a conical structure, and an included angle between the bottom wall and the side wall of the sludge concentration tank 100 is 100-150 degrees, so that sludge can be conveniently collected along the bottom wall to the middle sludge collecting groove 200, the inclined arm 31 is parallel to the bottom wall of the sludge concentration tank 100, and the scraper 32 is conveniently installed parallel to the bottom wall so as to improve the scraping efficiency.

Referring to fig. 2, an included angle of 20-80 degrees is formed between the working surface 321 on the front side of each scraper 32 and the bottom surface 322 of the scraper 32, the bottom surface 322 is used for being attached to the bottom wall of the sludge concentration tank 100, and by arranging the inclined working surface 321 on the scraper 32, the problem that sludge cannot be scraped effectively due to sludge caking is avoided, the sludge scraping efficiency of the scraper 32 can be improved, the sludge scraping resistance in the rotation process is reduced, the energy consumption of the driving motor 1 is reduced, and the service life of the scraper 32 is prolonged. Referring to fig. 5, an included angle of 10-60 degrees is formed between the axial direction of each mud scraper 32 and the long end direction of the inclined arm 31, so that the contact area of the mud scraper and sludge can be increased, the mud scraping efficiency can be improved, the mud scraping resistance can be reduced, and a certain escaping space is improved for water flow in the sludge.

Referring to fig. 1, the mud scraping plate 32 on the inclined arm 31 on one side of the central transmission shaft 2 and the mud scraping plate 32 on the inclined arm 31 on the other side are symmetrically distributed by taking the axle center of the central transmission shaft 2 as the center, and in the process that the central transmission shaft 2 is driven by the driving motor 1 to rotate, the mud scraping mechanisms 3 on the left side and the right side can improve the mud scraping effect, can play a role of gravity balance and improve the mechanical stability of the mud scraping device.

Referring to fig. 4, a connecting shaft 6 is arranged at the lower part of the central transmission shaft 2, the cross section of the connecting shaft 6 is in a non-circular structure, the stirring mechanism 4 is sleeved outside the connecting shaft 6 to form non-rotating connection with the connecting shaft, and the stirring mechanism 4 is driven to synchronously rotate together when the driving motor 1 drives the central transmission shaft 2 to rotate, so that sludge in the sludge collecting tank 200 is stirred, caking of the sludge is avoided, and sludge discharging efficiency is improved. Referring to fig. 1, the bottom end of the connecting shaft 6 is connected with a limit bearing 7, the limit bearing 7 is located below the stirring mechanism 4 to limit the stirring mechanism, and the limit bearing 7 is rotatably installed at the bottom of the sludge collection groove 200.

Referring to fig. 4 and 6, the stirring mechanism 4 includes a stirring sleeve 41 sleeved outside the connecting shaft 6, stirring bars 42 distributed on the outer side surface of the stirring sleeve 41, and dispersing blocks 43 distributed on the outer surface of the stirring bars 42, for improving the effect of disturbing dispersed sludge. Referring to fig. 1, the length of the stirring rod 42 at the lower portion of the stirring sleeve 41 does not exceed the length of the stirring rod 42 at the upper portion of the stirring sleeve 41, and is matched with the structure of the mud collecting channel 200 in a funnel shape.

Referring to fig. 1, 3 and 6, a steady flow tube 5 is further arranged above the mud scraping mechanism 3, the steady flow tube 5 is sleeved outside the central transmission shaft 2, and the steady flow tube 5 is fixedly connected with the working bridge 300. The upper part of the side surface of the sludge concentration tank 100 is penetrated with a sewage inlet pipe 101, the side surface of the steady flow cylinder 5 is provided with a water inlet 51, and the sewage inlet pipe 101 is penetrated with the water inlet 51. Sewage flows into the steady flow cylinder 5 through the sewage inlet pipe 101 and the water inlet 51, so that the direction of the sewage entering the sludge concentration tank 100 is changed, the water flow speed is reduced, the sludge settling time is prolonged, and the sludge settling effect is improved.

The inside cover of stationary flow section of thick bamboo 5 is equipped with inner skleeve 52, and inner skleeve 52 cover is equipped with the outside of center transmission shaft 2, and the internal diameter of inner skleeve 52 is not less than center transmission shaft 2's external diameter, and a plurality of shunt opening 53 has been seted up to the cavity bottom that forms between stationary flow section of thick bamboo 5 and the inner skleeve 52, and sewage flows in from water inlet 51 back through the shunt opening 53 dispersion outflow entering sludge concentration pond 100, reduces the velocity of flow of sewage, changes the direction of entering sludge concentration pond 100, prolongs its residence time in sludge concentration pond 100, improves the sedimentation effect of mud in the sewage.

When the sludge scraping device for the sludge concentration tank works, under the driving action of the driving motor 1, the sludge scraping mechanism 3 and the stirring mechanism 4 synchronously rotate along with the central transmission shaft 2, sludge deposited on the bottom wall of the sludge concentration tank 100 is scraped and collected through the sludge scraping plate 32 so as to be gathered into the sludge collecting tank 200 along the bottom wall, the concentration grid 33 can synchronously rotate along with the central transmission shaft 2, a flocculent sludge depositing space is provided, the descending of the sludge is accelerated, and the sludge in the sludge collecting tank 200 is synchronously stirred through the stirring mechanism 4, so that the sludge is prevented from being deposited and agglomerated and being difficult to pump and discharge. Sludge deposited at the bottom of the sludge concentration tank 100 is pumped and discharged into a subsequent sludge concentration tank through a sludge discharge pump 500 and a sludge discharge pipe 400, supernatant at the top of the sludge concentration tank 100 overflows into a clear water temporary storage tank 700 through an overflow weir 800, and flows out to a next treatment device or water using equipment through a supernatant outlet 600.

While the utility model has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the utility model with reference to specific embodiments, and it is not intended to limit the practice of the utility model to those descriptions. Therefore, all technical solutions which are available to the person skilled in the art based on the prior art through logic analysis, reasoning or limited experiments according to the inventive concept are within the scope of protection defined by the claims.

Claims (10)

1. The mud scraping device for the sludge concentration tank is vertically arranged in the sludge concentration tank (100) and is characterized by comprising a driving motor (1), a central transmission shaft (2), a mud scraping mechanism (3) and a stirring mechanism (4), wherein the driving motor (1) is in transmission connection with the central transmission shaft (2), the mud scraping mechanism (3) is arranged in the middle of the central transmission shaft (2), and the stirring mechanism (4) is sleeved at the lower part of the central transmission shaft (2);

The mud scraping mechanism (3) comprises two groups of inclined arms (31) symmetrically fixed on two sides of the central transmission shaft (2), a plurality of mud scraping plates (32) are fixedly connected to the lower portion of each group of inclined arms (31), each mud scraping plate (32) is attached to the bottom wall of the mud concentration tank (100), a plurality of groups of concentration grid bars (33) are fixedly connected to the upper portion of each group of inclined arms (31), two groups of transverse arms (34) are symmetrically fixed on two sides of the central transmission shaft (2), the transverse arms (34) are fixedly connected with the concentration grid bars (33), and the upper portion of each group of transverse arms (34) is connected with the central transmission shaft (2) through at least two connecting rods (35);

the stirring mechanism (4) is arranged in a sludge collecting groove (200) at the bottom of the sludge concentration tank (100), and driven by the driving motor (1), and the sludge scraping mechanism (3) and the stirring mechanism (4) realize synchronous rotation with the central transmission shaft (2).

2. The sludge scraping device for the sludge concentration tank according to claim 1, wherein the bottom wall of the sludge concentration tank (100) is of a conical structure, an included angle between the bottom wall and the side wall of the sludge concentration tank (100) is 100-150 degrees, and the inclined arm (31) is parallel to the bottom wall of the sludge concentration tank (100).

3. A sludge scraping device for a sludge concentrating tank according to claim 2, characterized in that an included angle of 20-80 degrees is formed between the working surface (321) of the front side of each sludge scraping plate (32) and the bottom surface (322) of the sludge scraping plate (32), the bottom surface (322) is attached to the bottom wall of the sludge concentrating tank (100), and an included angle of 10-60 degrees is formed between the axial direction of each sludge scraping plate (32) and the long end direction of the inclined arm (31).

4. A sludge scraping device for a sludge thickening tank according to claim 3, wherein the sludge scraping plates (32) on one side inclined arm (31) and the sludge scraping plates (32) on the other side inclined arm (31) of the central transmission shaft (2) are symmetrically distributed with the axis of the central transmission shaft (2) as the center.

5. The sludge scraping device for the sludge concentration tank according to claim 1, wherein a steady flow cylinder (5) is further arranged above the sludge scraping mechanism (3), the steady flow cylinder (5) is sleeved outside the central transmission shaft (2), a working bridge frame (300) is fixedly arranged above the sludge concentration tank (100), and the steady flow cylinder (5) is fixedly connected with the working bridge frame (300);

The sewage water inlet pipe (101) is arranged on the upper portion of the side face of the sludge concentration tank (100) in a penetrating mode, the water inlet (51) is formed in the side face of the steady flow barrel (5), and the sewage water inlet pipe (101) is connected with the water inlet (51) in a penetrating mode.

6. The sludge scraping device for the sludge concentration tank according to claim 5, wherein an inner sleeve (52) is sleeved in the steady flow cylinder (5), the inner sleeve (52) is sleeved with the outside of the central transmission shaft (2), the inner diameter of the inner sleeve (52) is not smaller than the outer diameter of the central transmission shaft (2), a plurality of shunt ports (53) are formed in the bottom of a cavity formed between the steady flow cylinder (5) and the inner sleeve (52), and sewage flows into the sludge concentration tank (100) after flowing in from the water inlet (51) through the shunt ports (53) in a dispersed manner.

7. The sludge scraping apparatus for a sludge concentrating tank according to claim 5, wherein the driving motor (1) is fixed on the working bridge (300), and a sludge discharge pipe (400) and a sludge discharge pump (500) are connected to the side surface of the sludge collecting tank (200).

8. The sludge scraping device for the sludge concentration tank according to claim 1, wherein a connecting shaft (6) is arranged at the lower part of the central transmission shaft (2), the stirring mechanism (4) is sleeved outside the connecting shaft (6) and is in non-rotating connection with the connecting shaft, a limit bearing (7) is connected to the bottom end of the connecting shaft (6), and the limit bearing (7) is rotatably arranged at the bottom of the sludge collecting groove (200).

9. The sludge scraping device for the sludge concentration tank according to claim 8, wherein the stirring mechanism (4) comprises a stirring sleeve (41) sleeved outside the connecting shaft (6), stirring rods (42) distributed on the outer side surface of the stirring sleeve (41), and dispersing blocks (43) distributed on the outer surface of the stirring rods (42).

10. A sludge scraping apparatus for a sludge thickening tank as claimed in claim 9, wherein the length of the stirring rod (42) located at the lower portion of the stirring sleeve (41) does not exceed the length of the stirring rod (42) located at the upper portion of the stirring sleeve (41).