CN220766655U - Mud scraper and sewage treatment device - Google Patents

Abstract

The embodiment of the utility model discloses a mud scraper and a sewage treatment device, wherein the mud scraper comprises a main shaft, a scraping arm assembly, an air inlet pipe, a flushing air pipe, an air supply assembly and a sealing assembly, wherein the scraping arm assembly is arranged at the lower part of the main shaft and is used for scraping sludge on the bottom wall of a sedimentation tank, the sealing assembly comprises a movable ring part, a guide pipe and a static ring part, the guide pipe penetrates through the movable ring part and the static ring part and is fixedly connected with the movable ring part, the movable ring part can rotate relative to the static ring part, one end of the air inlet pipe is communicated with the air supply assembly, the other end of the air inlet pipe is arranged at the static ring part and is communicated with one end of the guide pipe, the main shaft is connected with the movable ring part, a shaft cavity is arranged in the main shaft and is communicated with the guide pipe, the flushing air pipe is arranged above the scraping arm assembly and is communicated with the shaft cavity, the flushing air pipe is provided with a plurality of air outlet holes towards one side of the inclined pipe assembly, and the air outlet holes are used for flushing sludge in the inclined pipe assembly, the inclined pipe assembly is not required to be manually flushed by a high-pressure water gun, the labor intensity of workers is reduced, and the flushing efficiency of the inclined pipe assembly is improved.

Description

Mud scraper and sewage treatment device

Technical Field

The utility model relates to the technical field of mud scrapers, in particular to a mud scraper and a sewage treatment device.

Background

The sewage treatment engineering is a public utility engineering which protects the environment, saves energy and reduces emission and benefits offspring, the advanced treatment of sewage needs to use a magnetic flocculation sedimentation purification process, most of the magnetic flocculation sedimentation tanks are provided with honeycomb inclined pipes, the sedimentation rate of the sedimentation tanks can be effectively increased by arranging the inclined pipes, sewage flows reversely from bottom to top from the honeycomb inclined pipes, most of sludge can be mixed with magnetic powder, the flocculate is gathered to be settled to the bottom of the sedimentation tanks, the sludge is scraped and discharged by a sludge scraper, but a part of the flocculate which is lighter and is not easy to settle can enter the inclined pipes through water flow and is attached to the walls of the inclined pipes, so that the inclined pipes need to be cleaned regularly.

The existing inclined tube cleaning scheme is to manually use a high-pressure water gun to wash the inclined tube, so that the labor intensity of workers is high, and the cleaning working efficiency is low.

Disclosure of Invention

The utility model aims to provide a mud scraper and a sewage treatment device, and aims to solve the technical problems that the labor intensity of workers is high and the cleaning working efficiency is low due to the fact that a high-pressure water gun is used for flushing an inclined tube manually in the prior art.

In a first aspect, the utility model provides a mud scraper, which is used for scraping mud in a sedimentation tank, wherein an inclined tube assembly is arranged in the sedimentation tank, and the mud scraper comprises a main shaft, a scraping arm assembly, an air inlet pipe, a flushing air pipe, an air supply assembly and a sealing assembly;

the scraping arm component is arranged at the lower part of the main shaft and is used for scraping sludge on the bottom wall of the sedimentation tank, the sealing component comprises a movable ring part, a conduit and a static ring part, the conduit penetrates through the movable ring part and the static ring part and is fixedly connected with the movable ring part, the movable ring part can rotate relative to the static ring part, one end of the air inlet pipe is communicated with the air supply component, the other end of the air inlet pipe is arranged on the static ring part, and with the one end intercommunication of pipe, the main shaft with movable ring portion connects, be equipped with the axle chamber in the main shaft, the axle chamber with the pipe is linked together, wash the trachea install in scrape arm assembly's top, and with the axle chamber intercommunication, wash the trachea towards one side of pipe chute subassembly is provided with a plurality of ventholes, the venthole is used for washing mud in the pipe chute subassembly.

Preferably, the two flushing air pipes are arranged at two sides of the main shaft oppositely and are communicated with the shaft cavity of the main shaft.

Preferably, a first flange is installed at one end, close to the sealing assembly, of the air inlet pipe, the static ring part comprises a second flange and a static ring body, the static ring body is installed in the second flange, and the second flange is detachably connected with the first flange;

the movable ring part comprises a movable ring body and a third flange, the movable ring body and the third flange are sleeved on the guide pipe, the movable ring body can rotate relative to the stationary ring body, a fourth flange is arranged at the end part, close to one side of the movable ring part, of the main shaft, and the fourth flange is detachably connected with the third flange.

Preferably, the moving ring portion further includes a bracket and an elastic member, the moving ring body is disposed on the bracket, and the elastic member elastically abuts against the bracket and the moving ring body, so that an end face of the moving ring body can abut against an end face of the stationary ring body.

Preferably, the sealing assembly further comprises a first sealing ring and a second sealing ring, wherein the first sealing ring is sealed between the movable ring body and the support, and the second sealing ring is sealed between the support and the guide pipe.

Preferably, the air outlet holes are arranged on the flushing air pipe at intervals along the extending direction of the flushing air pipe.

Preferably, the mud scraper further comprises a supporting rod, and the flushing air pipe is installed in the scraping arm assembly through the supporting rod.

Preferably, the main shaft comprises a first shaft and a second shaft connected with the first shaft, the shaft cavity is arranged in the first shaft, the flushing air pipe is communicated with the shaft cavity of the first shaft, and the scraping arm assembly is arranged on the second shaft.

Preferably, the mud scraper further comprises a driving assembly, wherein the driving assembly comprises a motor and a gear box, a driving shaft of the motor is in transmission connection with the gear box, and the gear box is in transmission connection with the main shaft.

In a second aspect, the present utility model provides a sewage treatment apparatus, which includes a sedimentation tank and the sludge scraper according to any one of the above embodiments, wherein an inclined tube assembly and a water collecting tank are disposed in the sedimentation tank, the inclined tube assembly is used for filtering sewage, the water collecting tank is disposed above the inclined tube assembly and is used for collecting purified water passing through the inclined tube assembly, the sludge scraper is installed in the sedimentation tank, and the flushing air pipe of the sludge scraper is disposed below the inclined tube assembly so as to flush sludge in the inclined tube assembly.

The embodiment of the utility model has the following beneficial effects:

by adopting the mud scraper and the sewage treatment device, one end of the air inlet pipe is communicated with the air supply assembly, the other end of the air inlet pipe is communicated with the shaft cavity of the main shaft, the flushing air pipe is arranged on the main shaft and is communicated with the shaft cavity, the flushing air pipe is provided with a plurality of air outlet holes, the air outlet holes can be used for flushing the sludge in the inclined pipe assembly, a high-pressure water gun is not required to be used for flushing the sludge in the inclined pipe assembly manually, the labor intensity of workers is reduced, and the flushing efficiency of the inclined pipe assembly is improved.

Further, the air inlet pipe is connected with the static ring part and communicated with the guide pipe, the main shaft is connected with the movable ring part, the shaft cavity is communicated with the guide pipe, and the movable ring part can rotate relative to the static ring part, so that air in the air inlet pipe entering the sealing assembly can be prevented from leaking, the sealing performance of air conveying is ensured, the working stability and reliability of the mud scraper are ensured, and the flushing efficiency of the inclined pipe assembly is improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Wherein:

fig. 1 is a schematic view of a sewage treatment apparatus in one embodiment.

Fig. 2 is a cross-sectional view of a seal assembly in the sewage treatment apparatus shown in fig. 1.

Reference numerals: 10. a mud scraper; 20. a sedimentation tank; 21. a chute assembly; 22. a water collection tank; 100. a main shaft; 110. a first shaft; 111. a shaft cavity; 120. a second shaft; 210. a first flange; 300. flushing the trachea; 400. a seal assembly; 410. a stationary ring portion; 411. a second flange; 412. a stationary ring body; 413. a gasket; 420. a conduit; 430. a moving ring section; 431. a moving ring body; 432. a third flange; 433. a bracket; 434. an elastic member; 440. a first seal ring; 450. a second seal ring; 500. a wiper arm assembly; 510. a wiper arm body; 520. a scraper; 530. a hub; 600. a support rod; 700. a drive assembly; 710. a motor; 720. a gear box; 730. a speed reducer; 810. a scraper; 820. and (3) a bearing.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The embodiment of the utility model provides a mud scraper and a sewage treatment device, wherein the mud scraper is mainly used for removing mud in a sedimentation tank.

Referring to fig. 1 and 2, a mud scraper 10 of an embodiment is used for scraping mud in a sedimentation tank 20, an inclined tube assembly 21 is disposed in the sedimentation tank 20, the mud scraper 10 includes a main shaft 100, a scraping arm assembly 500, an air inlet tube, a flushing air tube 300, an air supply assembly and a sealing assembly 400, the scraping arm assembly 500 is mounted at the lower part of the main shaft 100 and is used for scraping mud at the bottom wall of the sedimentation tank 20, the sealing assembly 400 includes a movable ring portion 430, a conduit 420 and a static ring portion 410, the conduit 420 penetrates through the movable ring portion 430 and the static ring portion 410 and is fixedly connected with the movable ring portion 430, the movable ring portion 430 can rotate relative to the static ring portion 410, one end of the air inlet tube is communicated with the air supply assembly, the other end of the air inlet tube is mounted on the static ring portion 410 and is communicated with one end of the conduit 420, the main shaft 100 is connected with the movable ring portion 430, an axial cavity 111 is disposed in the main shaft 100, the axial cavity 111 is communicated with the conduit 420, the flushing air outlet 300 is mounted above the scraping arm assembly 500 and is communicated with the axial cavity 111, and one side of the flushing air tube 300 facing the inclined tube assembly 21 is provided with a plurality of holes for flushing mud in the inclined tube assembly 21.

It can be appreciated that one end of the air inlet pipe is communicated with the air supply assembly, the other end of the air inlet pipe is communicated with the shaft cavity 111 of the main shaft 100, the flushing air pipe 300 is arranged on the main shaft 100 and is communicated with the shaft cavity 111, air provided by the air supply assembly sequentially passes through the air inlet pipe, the guide pipe 420, the shaft cavity 111 and the flushing air pipe 300, and finally is sprayed into the inclined tube assembly 21 through the air outlet hole on the flushing air pipe 300, so that the inclined tube assembly 21 is cleaned, the high-pressure water gun is not required to be manually used for flushing sludge in the inclined tube assembly 21, the labor intensity of workers is reduced, and the flushing efficiency of the inclined tube assembly 21 is improved.

Further, the air inlet pipe is connected with the static ring part 410 and is communicated with the guide pipe 420, the main shaft 100 is connected with the movable ring part 430, the shaft cavity 111 is communicated with the guide pipe 420, and the movable ring part 430 can rotate relative to the static ring part 410, so that air entering the sealing assembly 400 through the air inlet pipe can be prevented from leaking, the difficult problems of static air inlet pipe and rotation of the main shaft 100 are solved, the air conveying tightness is ensured, and the flushing efficiency of the inclined tube assembly 21 is improved.

In an embodiment, referring to fig. 1 and 2, two flushing air pipes 300 are provided, and are oppositely disposed at two sides of the main shaft 100 and are all communicated with the shaft cavity 111 of the main shaft 100, when sludge in the inclined tube assembly 21 needs to be flushed, the main shaft 100 can drive the scraping arm assembly 500 and the flushing air pipes 300 to rotate so as to flush all inclined tubes in the inclined tube assembly 21, and after the main shaft 100 rotates for half a turn through the two flushing air pipes 300, the flushing air pipes 300 can clean all inclined tubes in the inclined tube assembly 21 without dead angles, so that the flushing efficiency of the inclined tube assembly 21 is improved.

In an embodiment, referring to fig. 2, a first flange 210 is installed at one end of the air inlet pipe close to the sealing assembly 400, the static ring portion 410 includes a second flange 411, a gasket 413 and a static ring body 412, the gasket 413 is a tetrafluoro pad, the static ring body 412 is installed in the second flange 411 through the gasket 413, the second flange 411 is detachably connected with the first flange 210, so that the flange is convenient to replace after being damaged, and a sealing gasket is arranged between the first flange 210 and the second flange 411 to ensure a sealing effect between the first flange 210 and the second flange 411, so that air entering the sealing assembly 400 through the air inlet pipe is prevented from leaking.

Further, the moving ring portion 430 includes a moving ring body 431 and a third flange 432, the moving ring body 431 and the third flange 432 are both sleeved on the conduit 420, the moving ring body 431 can rotate relative to the stationary ring body 412, the moving ring body 431 rotates relative to the stationary ring body 412 to realize sealing and dynamic sealing of media, a fourth flange is arranged at an end portion of the main shaft 100, which is close to one side of the moving ring portion 430, and the fourth flange is detachably connected with the third flange 432, so that replacement after damage of the flange is facilitated.

Still further, the moving ring portion 430 further includes a support 433 and an elastic element 434, the moving ring body 431 is disposed on the support 433, the elastic element 434 is a spring, the elastic element 434 elastically abuts against the support 433 and the moving ring body 431, so as to abut against an end surface of the moving ring body 431 on an end surface of the stationary ring body 412, ensure that the end surface of the moving ring body 431 can be stably and reliably attached to the end surface of the stationary ring body 412, the spring is used for providing initial internal sealing pressure, the sealing assembly 400 is in a pressure sealing state after starting to operate, and the spring plays a role of compensating for sealing abrasion, so as to avoid leakage of gas in the sealing assembly 400.

In an embodiment, referring to fig. 2, the seal assembly 400 further includes a first seal ring 440 and a second seal ring 450, where the first seal ring 440 and the second seal ring 450 are O-rings, the first seal ring 440 is sealed between the movable ring body 431 and the support 433, the second seal ring 450 is sealed between the support 433 and the conduit 420, and by setting the first seal ring 440, gas in the seal assembly 400 can be prevented from leaking out from a gap between the movable ring body 431 and the support 433, and by setting the second seal ring 450, gas in the seal assembly 400 can be prevented from leaking out from a gap between the support 433 and the conduit 420, thereby improving the sealing effect of the seal assembly 400.

In an embodiment, the air outlet holes are arranged on the flushing air pipe 300 at intervals along the extending direction of the flushing air pipe 300, and the interval between the air outlet holes can be adjusted according to the interval between the inclined pipes in the inclined pipe assembly 21, so as to ensure that the air sprayed out of the air outlet holes can flush the sludge in the inclined pipes without dead angles.

In an embodiment, referring to fig. 1, the mud scraper 10 further includes a support bar 600, the support bar 600 is a pull rod, the flushing air pipe 300 is installed on the scraping arm assembly 500 through the support bar 600, and the support bar 600 plays a role in supporting and fixing the flushing air pipe 300.

In an embodiment, referring to fig. 1, the main shaft 100 includes a first shaft 110 and a second shaft 120 connected to the first shaft 110, the shaft cavity 111 is disposed in the first shaft 110, the flushing air pipe 300 is communicated with the shaft cavity 111 of the first shaft 110, air enters the flushing air pipe 300 through the shaft cavity 111 of the first shaft 110, the wiper arm assembly 500 is mounted on the second shaft 120, in order to ensure structural strength of the main shaft 100, the first shaft 110 may be a hollow shaft, and the second shaft 120 may be a solid shaft.

In an embodiment, referring to fig. 1, the mud scraper 10 further includes a driving assembly 700, where the driving assembly 700 includes a motor 710, a speed reducer 730, and a gear box 720, a driving shaft of the motor 710 is in transmission connection with the gear box 720 through the speed reducer 730, the gear box 720 is in transmission connection with the main shaft 100, the motor 710 drives an internal gear of the gear box 720 to rotate, the internal gear of the gear box 720 rotates to drive the main shaft 100 to rotate, the main shaft 100 rotates to drive the scraping arm assembly 500 and the flushing air pipe 300 to rotate, so as to ensure that the scraping arm assembly 500 can scrape mud on a bottom wall of the sedimentation tank 20, and the flushing air pipe 300 can flush the mud in the inclined tube assembly 21.

In an embodiment, referring to fig. 1, the wiper arm assembly 500 includes a wiper arm body 510, a wiper blade 520 and a hub 530, the wiper arm body 510 is mounted on the second shaft 120 through the hub 530, the flushing air pipe 300 is mounted on the wiper arm body 510 through a supporting rod 600, the wiper blade 520 is mounted under the wiper arm body 510, and the driving assembly 700 drives the spindle 100 to rotate, so that the spindle 100 can drive the hub 530, the wiper arm body 510 and the wiper blade 520 to rotate, and the wiper blade 520 can scrape sludge on the bottom wall of the sedimentation tank 20.

In an embodiment, referring to fig. 1, the sludge scraper 10 further includes a scraper 810 and a bearing 820, the scraper 810 is mounted on the second shaft 120 through the bearing 820 and is disposed in a sludge bucket of the sedimentation tank 20, the sludge scraped by the scraper arm assembly 500 slides to the middle sludge bucket along the bottom wall of the sedimentation tank 20, and the scraper 810 breaks up the bulk sludge, so that the subsequent sludge is discharged from the sedimentation tank 20 through the sludge discharge pipeline.

Referring to fig. 1 and 2, an apparatus for treating sewage according to an embodiment includes a sedimentation tank 20 and a sludge scraper 10 according to any one of the above embodiments, an inclined tube assembly 21 and a water collecting tank 22 are disposed in the sedimentation tank 20, the inclined tube assembly 21 is used for filtering sewage, the inclined tube assembly 21 is a structural member made of PP (polypropylene), the water collecting tank 22 is disposed above the inclined tube assembly 21 and is used for collecting purified water passing through the inclined tube assembly 21, the sludge scraper 10 is mounted in the sedimentation tank 20, and a flushing air pipe 300 of the sludge scraper 10 is disposed below the inclined tube assembly 21 so as to flush sludge in the inclined tube assembly 21.

It can be appreciated that one end of the air inlet pipe is communicated with the air supply assembly, the other end of the air inlet pipe is communicated with the shaft cavity 111 of the main shaft 100, the flushing air pipe 300 is arranged on the main shaft 100 and is communicated with the shaft cavity 111, air provided by the air supply assembly sequentially passes through the air inlet pipe, the guide pipe 420, the shaft cavity 111 and the flushing air pipe 300, and finally is sprayed into the inclined tube assembly 21 through the air outlet hole on the flushing air pipe 300, so that the inclined tube assembly 21 is cleaned, the high-pressure water gun is not required to be manually used for flushing sludge in the inclined tube assembly 21, the labor intensity of workers is reduced, and the flushing efficiency of the inclined tube assembly 21 is improved.

Further, the air inlet pipe is connected with the static ring part 410 and is communicated with the guide pipe 420, the main shaft 100 is connected with the movable ring part 430, the shaft cavity 111 is communicated with the guide pipe 420, the movable ring part 430 can rotate relative to the static ring part 410, so that air in the air inlet pipe entering the sealing assembly 400 can be prevented from leaking out, the air conveying tightness is ensured, the working stability and reliability of the mud scraper 10 are ensured, the flushing efficiency of the inclined pipe assembly 21 is improved, and the working reliability of the sewage treatment device is ensured.

The sewage flows in the magnetic coagulation sedimentation tank 20 from bottom to top, most sludge in the sewage can react with magnetic powder, and the sewage is settled to the bottom wall of the reaction tank by means of self gravity after being aggregated into flocs, but a part of the flocs which are lighter and are not easy to settle can enter the inclined tube assembly 21 along with water flow and are attached to the wall of the inclined tube, so that the inclined tube assembly 21 can intercept the part of the flocs which are lighter and are not easy to settle and impurities, the sedimentation rate of the sedimentation tank 20 can be improved by arranging the inclined tube assembly 21, the flocs are prevented from entering the water collecting tank 22 along with water flow, and the water collecting tank 22 collects purified water passing through the inclined tube assembly 21 and discharges the purified water through a pipeline.

The bottom wall of the sedimentation tank 20 can accumulate a lot of sludge after a long time, the sludge is adhered to the pipe wall of the inclined pipe assembly 21, the sewage treatment needs to be stopped and the mud scraper 10 needs to be started at the time, the mud at the bottom wall of the sedimentation tank 20 is scraped by the scraping arm assembly 500, the sludge in the inclined pipe assembly 21 is cleaned by the flushing air pipe 300, and after the sludge in the inclined pipe assembly 21 and the sludge at the bottom wall of the sedimentation tank 20 are cleaned, the sedimentation tank 20 can carry out sewage treatment again.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims (10)

1. The mud scraper is used for scraping mud in a sedimentation tank, and an inclined tube assembly is arranged in the sedimentation tank, and is characterized by comprising a main shaft, a scraping arm assembly, an air inlet pipe, a flushing air pipe, an air supply assembly and a sealing assembly;

the scraping arm component is arranged at the lower part of the main shaft and is used for scraping sludge on the bottom wall of the sedimentation tank, the sealing component comprises a movable ring part, a conduit and a static ring part, the conduit penetrates through the movable ring part and the static ring part and is fixedly connected with the movable ring part, the movable ring part can rotate relative to the static ring part, one end of the air inlet pipe is communicated with the air supply component, the other end of the air inlet pipe is arranged on the static ring part, and with the one end intercommunication of pipe, the main shaft with movable ring portion connects, be equipped with the axle chamber in the main shaft, the axle chamber with the pipe is linked together, wash the trachea install in scrape arm assembly's top, and with the axle chamber intercommunication, wash the trachea towards one side of pipe chute subassembly is provided with a plurality of ventholes, the venthole is used for washing mud in the pipe chute subassembly.

2. The mud scraper of claim 1, wherein two flushing air pipes are provided and are oppositely arranged at two sides of the main shaft, and are communicated with the shaft cavity of the main shaft.

3. The mud scraper of claim 1, wherein a first flange is mounted at an end of the air inlet pipe adjacent to the sealing assembly, the stationary ring portion comprises a second flange and a stationary ring body, the stationary ring body is mounted in the second flange, and the second flange is detachably connected with the first flange;

the movable ring part comprises a movable ring body and a third flange, the movable ring body and the third flange are sleeved on the guide pipe, the movable ring body can rotate relative to the stationary ring body, a fourth flange is arranged at the end part, close to one side of the movable ring part, of the main shaft, and the fourth flange is detachably connected with the third flange.

4. A mud scraper according to claim 3, wherein the movable ring part further comprises a bracket and an elastic member, the movable ring body is provided on the bracket, and the elastic member elastically abuts against the bracket and the movable ring body so as to be capable of abutting an end surface of the movable ring body against an end surface of the stationary ring body.

5. The mud scraper of claim 4, wherein the seal assembly further comprises a first seal ring sealed between the movable ring body and the bracket and a second seal ring sealed between the bracket and the conduit.

6. The mud scraper of claim 1, wherein the air outlet holes are spaced apart on the flushing air pipe in the direction of extension of the flushing air pipe.

7. The mud scraper of claim 1, further comprising a support bar, wherein the flushing air pipe is mounted to the scraper arm assembly via the support bar.

8. The mud scraper of claim 7, wherein the main shaft comprises a first shaft and a second shaft connected to the first shaft, the shaft cavity is provided in the first shaft, the flushing air pipe is communicated with the shaft cavity of the first shaft, and the scraper arm assembly is mounted on the second shaft.

9. The mud scraper of claim 1, further comprising a drive assembly including a motor and a gear box, a drive shaft of the motor in driving connection with the gear box, the gear box in driving connection with the main shaft.

10. The sewage treatment device is characterized by comprising a sedimentation tank and the sludge scraper of any one of claims 1 to 9, wherein an inclined tube assembly and a water collecting tank are arranged in the sedimentation tank, the inclined tube assembly is used for filtering sewage, the water collecting tank is arranged above the inclined tube assembly and is used for collecting purified water passing through the inclined tube assembly, the sludge scraper is arranged in the sedimentation tank, and a flushing air pipe of the sludge scraper is arranged below the inclined tube assembly so as to flush sludge in the inclined tube assembly.