CN114590869A

CN114590869A - Oil-containing sewage's centrifugal separation processing apparatus

Info

Publication number: CN114590869A
Application number: CN202210505895.9A
Authority: CN
Inventors: 兰雪燕; 王嘉琪
Original assignee: Shandong Baiyuan Technology Co Ltd
Current assignee: QINGDAO TUANDAO SEWAGE TREATMENT PLANT
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2022-06-07
Anticipated expiration: 2042-05-11
Also published as: CN114590869B

Abstract

The invention relates to the technical field of oily sewage treatment, and particularly discloses a centrifugal separation treatment device for oily sewage, which comprises a motor and a circular platform ring plate, wherein the middle parts of a circular plate and a platform plate are jointly and rotatably connected with a hollow pipe, centrifugal fan blades for stirring water flow are fixed on the side wall of the hollow pipe, a dome-shaped splitter plate is fixedly arranged on the upper part of the inner wall of the circular platform ring plate, a through hole for discharging oil is formed in the center of the splitter plate, a liquid injection pipe is arranged right above the hollow pipe, a cleaning device is further arranged on the circular platform ring plate, and the cleaning device absorbs precipitated gravel and conveys the gravel out of the circular platform ring plate. The invention can rapidly remove sand and stone and separate oil from water for petroleum sewage.

Description

Oil-containing sewage's centrifugal separation processing apparatus

Technical Field

The invention relates to the technical field of oily sewage treatment, in particular to a centrifugal separation treatment device for oily sewage.

Background

As a dangerous waste, petroleum refining sewage and oily sludge are always important contents for pollution control of enterprises. In recent years, through measures such as technical innovation, improvement of treatment strength and the like, the upstream and downstream industries of petroleum have made great progress in the aspects of green development and ecological environmental protection, but the pollution of waste water and sludge pollutants to the environment is still serious, and great challenges are faced.

In the face of the problems and challenges of lack of special pollution control standards, high treatment cost, environmental protection hidden danger existing in the final path of treated residues and the like, enterprises such as China petroleum, China petrochemical industry, China sea oil and the like are focused on the front edge of the industry for many years, the technological and critical forces are increased, and the research and engineering application of new technologies, new processes and new equipment for sewage and sludge treatment and oil field water injection is continuously promoted. Wherein, the technologies of solvent extraction, water washing treatment, biological treatment, profile control, thermal extraction, dehydration treatment, ultrasonic deoiling, thermal decomposition treatment and the like have achieved remarkable effect.

But the sewage after oil exploitation usually contains a large amount of silt and oil slick, and current equipment is usually through the centrifugation directly with grit stirring centrifugal separation come out, avoids influencing subsequent deoiling equipment work, does not have the equipment that can separate grit and greasy dirt simultaneously now.

Based on the above, the invention designs a centrifugal separation treatment device for oily sewage to solve the problems.

Disclosure of Invention

The invention aims to provide a centrifugal separation treatment device for oily sewage, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a centrifugal separation treatment device for oily sewage comprises a motor and a circular platform ring plate, wherein a ring support plate is fixedly arranged on the lower end face of the circular platform ring plate, a circular plate is arranged in the center of the ring support plate in a rotating mode, an anti-backflow platen is fixedly arranged on the top face of the circular plate, a hollow pipe is connected with the middle of the circular plate and the platen in a rotating mode, centrifugal fan blades for stirring water flow are fixedly arranged on the side wall of the hollow pipe, a dome-shaped splitter plate is fixedly arranged on the upper portion of the inner wall of the circular platform ring plate, a through hole for discharging oil is formed in the center of the splitter plate, a liquid injection pipe is arranged right above the hollow pipe, the diameter of the liquid injection pipe is smaller than that of the hollow pipe, the bottom end of the liquid injection pipe extends into the hollow pipe, the top end of the liquid injection pipe extends to the upper portion of the splitter plate, the liquid injection pipe is used for guiding the oily sewage into the hollow pipe and is fixedly installed with the splitter plate, an upper flow pipe penetrating through the side wall of the circular platform ring plate is arranged above the splitter plate, the flow distribution plate is provided with a down pipe penetrating through the side wall of the circular truncated cone ring plate below, the distance between the up pipe and the down pipe is the same as the thickness of the flow distribution plate, the circular truncated cone ring plate is also provided with a cleaning device, and the cleaning device absorbs settled gravel and conveys the gravel out of the circular truncated cone ring plate.

As a further scheme of the invention, the cleaning device comprises a cleaning pipe fixed on the inner side wall of the circular truncated cone annular plate, the bottom end of the cleaning pipe is fixedly arranged on the top surface of the annular support plate, a sand inlet is formed in the side wall of the bottom of the cleaning pipe, an auger shaft is coaxially arranged in the cleaning pipe, two ends of the auger shaft are rotatably connected with the cleaning pipe, a spiral conveying plate for conveying gravel to the top of the cleaning pipe is arranged on the auger shaft, and a transmission device for driving the auger shaft to rotate is further connected to the auger shaft.

As a further scheme of the invention, the transmission device comprises a bevel gear fixedly arranged at the bottom of the auger shaft, and the bevel gear is meshed with a ring gear fixedly assembled with the hollow pipe.

According to a further scheme of the invention, an air blowing mechanism for blowing gravel to move is arranged below the auger shaft, the air blowing mechanism comprises an air guide cavity formed in the bottom surface of the auger shaft, an air guide hole communicated with the air guide cavity is formed in the auger shaft, turbulence fan blades positioned on one side of the air guide hole are fixed on the side wall of the auger shaft, a pipe bending head is rotatably arranged at the lower end of the auger shaft, and an air guide structure for guiding air is arranged at the lower end of the pipe bending head.

As a further scheme of the invention, the gas guide structure comprises a C-ring plate with a C-shaped cross section, the center of circle of the C-ring plate is located on the axis of the hollow tube, a compensation ring plate for forming a sealed cavity with the sealed C-ring plate is rotatably assembled in the C-ring plate, the pipe corner is fixedly connected with the compensation ring plate and communicated with the sealed cavity, and a transverse tube for communicating the sealed cavity with the hollow tube is fixedly connected to the C-ring plate.

As a further scheme of the invention, the top of the side wall of the cleaning pipe on the circular truncated cone annular plate is provided with a sand discharge port for discharging gravel.

As a further scheme of the invention, the motor adopts a speed reducing motor which can obtain larger torque.

As a further scheme of the invention, the circular truncated cone-shaped hollow pipe driving device further comprises a driving structure for driving the hollow pipe to rotate, the driving structure comprises an outer toothed ring, a gear and a motor, the motor is fixedly assembled with the circular truncated cone-shaped annular plate, the end part of an output shaft of the motor is fixedly assembled with the gear, the outer toothed ring is sleeved and fixed on the outer side wall of the hollow pipe, and the outer toothed ring is assembled with the gear in a meshing manner.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the hollow pipe is driven to rotate by the motor, so that the centrifugal fan blades are driven to rotate, silt in sewage can be thrown to the circular plate and the circular support plate between the side wall of the bedplate and the inner wall of the circular platform plate through centrifugation, the silt is not subjected to centrifugal force after deposition, and the silt can be quickly cleaned and removed through the arranged cleaning device; compressed air is injected into the sewage injected by the liquid injection pipe, rising bubbles are formed in the sewage, so that oil foam dissolved in the sewage is quickly condensed into oil drops to float on the sewage liquid level, the centrifugal force of light liquid is small, so that floating oil is gathered to the sewage center, the floating oil layer is thicker and thicker, the floating oil flows out from the upper end of the flow distribution plate, and the sewage flows out from the lower end of the flow distribution plate to complete the separation treatment of oil and water.

2. The ring gear is driven to rotate indirectly through the hollow tube, the ring gear drives the bevel gear to rotate, the drive ring support plate rotates relative to the hollow tube simultaneously, so that the cleaning tube revolves, the sand inlet moves around a sediment deposition groove formed by the circular plate and the ring support plate, the auger shaft rotates under the action of the bevel gear and the ring gear, the spiral conveying plate rotates to clean and remove the sediment, the sand inlet moves, and the sediment cleaning is quicker and more efficient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic side-view, partially cross-sectional structural view of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2 according to the present invention;

FIG. 4 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

FIG. 5 is a schematic side-view, bottom-view, general configuration of the present invention;

FIG. 6 is a schematic view of the indirect connection structure of the ring gear and the hollow tube of the present invention.

In the drawings, the reference numbers indicate the following list of parts:

the device comprises a motor 9, a circular truncated cone annular plate 10, an annular support plate 11, a circular plate 12, a bedplate 13, a hollow tube 14, centrifugal fan blades 15, a flow distribution plate 16, a through hole 17, a liquid injection tube 18, an upper flow tube 19, a lower flow tube 20, a cleaning tube 23, a sand inlet 24, a packing auger shaft 25, a spiral conveying plate 26, a helical gear 27, an annular gear 28, an air guide cavity 30, an air guide hole 31, turbulent fan blades 32, a pipe bending head 33, a C annular plate 35, a transverse tube 36, a compensation annular plate 37 and a sand discharge port 40.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a centrifugal separation treatment device for oily sewage comprises a motor 9 and a circular truncated cone annular plate 10, wherein a circular truncated cone annular plate 11 is fixedly arranged on the lower end face of the circular truncated cone annular plate 10, a circular plate 12 is rotatably arranged in the center of the circular plate 11, a backflow-preventing bedplate 13 is fixedly arranged on the top face of the circular plate 12, a hollow pipe 14 is rotatably connected between the circular plate 12 and the bedplate 13, centrifugal fan blades 15 for stirring water flow are fixedly arranged on the side wall of the hollow pipe 14, a dome-shaped splitter plate 16 is fixedly arranged on the upper portion of the inner wall of the circular truncated cone annular plate 10, a through hole 17 for discharging oil is formed in the center of the splitter plate 16, a liquid injection pipe 18 is arranged right above the hollow pipe 14, the diameter of the liquid injection pipe 18 is smaller than that of the hollow pipe 14, the bottom end of the liquid injection pipe 18 extends into the hollow pipe 14, the top end of the liquid injection pipe 18 extends to the upper portion of the splitter plate 16, the liquid injection pipe 18 is used for guiding the oily sewage into the hollow pipe 14, and the liquid injection pipe 18 and the splitter plate 16 are fixedly installed, an up-flow pipe 19 penetrating through the side wall of the circular truncated cone ring plate 10 is arranged above the flow distribution plate 16, a down-flow pipe 20 penetrating through the side wall of the circular truncated cone ring plate 10 is arranged below the flow distribution plate 16, the distance between the up-flow pipe 19 and the down-flow pipe 20 is the same as the thickness of the flow distribution plate 16, and a cleaning device is further arranged on the circular truncated cone ring plate 10 and used for sucking deposited gravel and conveying the deposited gravel out of the circular truncated cone ring plate 10.

Before use, the device is assembled, the circular plate 12 is fixedly arranged on the ground, petroleum sewage is connected to the liquid injection pipe 18, high-pressure gas is connected to the hollow pipe 14, and sewage is injected into equipment while gas is introduced, wherein the upper end of the device is seen from top to bottom in fig. 1, and the device adopts an annular array arrangement mode;

when the invention is used, along with the introduction of sewage and compressed gas, the sewage liquid level in the circular truncated cone annular plate 10 rises, simultaneously, gas and sewage are introduced simultaneously, so that a large amount of bubbles appear in the sewage, the oil stain in the sewage is quickly gathered and condensed to form floating oil floating on the water surface under the action of the air bubbles, simultaneously, the motor 9 is started, the motor 9 drives the hollow pipe 14 to rotate on the circular plate 12, the hollow pipe 14 rotates to drive the centrifugal fan blades 15 to start rotating, the centrifugal fan blades 15 rotate to act on the sewage to accelerate the rotation of the sewage (as shown in figures 2 and 3, the rotation of the centrifugal fan blades 15 not only enables the sewage to accelerate the rotation to generate centrifugal force, but also enables the oil stain in the sewage to quickly act on the air bubbles to enable the oil stain to be quickly gathered, so that the oil stain is separated from the sewage and floats on the top of the sewage liquid level to form an oil layer), the sewage starts to rotate and flow after being accelerated, the silt with higher density inside is quickly thrown onto the circular truncated cone annular plate 10, so that the silt is quickly deposited on the circular plate 12 and the annular support plate 11 between the side wall of the bedplate 13 and the inner wall of the circular truncated cone annular plate 10, the silt is conveniently collected, compressed air is continuously injected into the hollow pipe 14, meanwhile, sewage is quickly injected into the liquid injection pipe 18, the liquid level of the sewage continuously rises, the centrifugal fan blades 15 are positioned at the lower end of the liquid level and are close to the circular plate 12 and the bedplate 13, so that the centrifugal force at the lower end of the liquid level is maximum, the centrifugal force at the upper end of the sewage is smaller and smaller as the liquid level rises, after the sewage fills the space between the downpipe 20 and the circular truncated cone annular plate 10 (the liquid injection amount of the liquid injection pipe 18 in unit time is unchanged, when the downpipe 20 is submerged by the liquid level, the water discharge amount of the downpipe 20 in unit time is consistent with the liquid injection amount of the liquid injection pipe 18 in unit time, and the sewage discharge amount and the injection amount are dynamically balanced at the moment), because the flow distribution plate 16 is designed to be dome-shaped, the liquid injection pipe 18 continuously inputs sewage, oil dirt can be continuously increased and collected, the thickness of the oil dirt can be continuously collected and increased at the bottom of the flow distribution plate 16, when excessive oil dirt is collected, the oil dirt can be discharged from the through hole 17 in the middle of the flow distribution plate 16 to the upper end of the flow distribution plate 16 (as shown in fig. 2, the centrifugal force at the upper end of the sewage is minimum, the density of the oil dirt is lower than that of water, the oil dirt always floats on the uppermost liquid level, and when the oil dirt is subjected to centrifugal action, the oil dirt floats on the rotating center of the sewage, the collected height of the oil dirt is slowly increased, so that floating oil can be positioned at the through hole 17 in the center of the flow distribution plate 16, the oil dirt accumulates more and is finally discharged from the through hole 17 in the center of the uppermost end of the flow distribution plate 16, and flows onto the up-flow pipe 19 on the side wall of the circular truncated cone ring plate 10 along the upper end of the flow distribution plate 16, and the upper-layer of the sewage at the lower end of the flow distribution plate 16 is low in rotation flow rate, thereby preventing the silt from moving upwards under the action of centrifugal force, so that the upper end of the sewage does not contain the silt and is discharged from the down flow pipe 20 on the side wall of the circular truncated cone annular plate 10 at the lowest point of the edge of the flow distribution plate 16;

as shown in fig. 1 and 2, in the state that the drainage quantity of the down flow pipe 20 per unit time is consistent with the liquid injection quantity of the liquid injection pipe 18 per unit time, the sewage liquid level does not rise to the middle highest point of the flow distribution plate 16, and is discharged from the down flow pipe 20; the cleaning device works simultaneously, so that silt at the upper ends of the circular plate 12 and the ring support plate 11 between the side wall of the bedplate 13 and the inner wall of the circular truncated cone ring plate 10 is cleaned out of the equipment upwards, and the silt cannot be mixed into sewage again under the action of centrifugal force when moving upwards.

According to the invention, the hollow pipe 14 is driven to rotate by the motor 9, the centrifugal fan blades 15 are driven to rotate, and silt in sewage can be centrifugally thrown to the upper ends of the circular plate 12 and the annular support plate 11 between the side wall of the bedplate 13 and the inner wall of the circular truncated cone annular plate 10, so that the silt is not subjected to the centrifugal force after being deposited and continuously moves along with the sewage, and the silt is quickly cleaned out of the equipment by the cleaning device;

secondly through annotating compressed air in the sewage that annotates liquid pipe 18 and pour into again for form the upwelling in the sewage, thereby will dissolve the greasy dirt in the sewage and condense fast and collect and go up along with sewage, again because of the centrifugal force of liquid level upper end is little, thereby with the greasy dirt focus to sewage central authorities, along with sewage liquid level height continuously rises, through dome-shaped flow distribution plate 16, separate sewage and oil droplet, make oil droplet flow from flow distribution plate 16 upper end, sewage flows from flow distribution plate 16 lower extreme, reach oil water separation's effect.

As a further scheme of the invention, the cleaning device comprises a cleaning pipe 23 fixed on the inner side wall of the circular truncated cone annular plate 10, the bottom end of the cleaning pipe 23 is fixedly arranged on the top surface of the annular support plate 11, a sand inlet 24 is arranged on the side wall of the bottom of the cleaning pipe 23, an auger shaft 25 is coaxially arranged in the cleaning pipe 23, two ends of the auger shaft 25 are rotatably connected with the cleaning pipe 23, a spiral conveying plate 26 for conveying gravel to the top of the cleaning pipe 23 is arranged on the auger shaft 25, and a transmission device for driving the auger shaft 25 to rotate is also connected on the auger shaft 25; the transmission device comprises a bevel gear 27 fixedly arranged at the bottom of the auger shaft 25, and the bevel gear 27 is meshed with a ring gear 28 fixedly assembled with the hollow pipe 14;

when the invention is used, the hollow pipe 14 drives the annular gear 28 to rotate, the annular gear 28 drives the bevel gear 27 to rotate, the bevel gear 27 drives the auger shaft 25 to rotate, the auger shaft 25 drives the spiral conveying plate 26 to rotate, silt accumulated at the upper ends of the circular plate 12 and the annular carrier plate 11 between the side wall of the bedplate 13 and the inner wall of the circular truncated cone annular plate 10 moves upwards along the cleaning pipe 23 through the sand inlet 24 (as shown in figures 2 and 4, the silt is subjected to centrifugal force and moves outwards to generate accumulation, and the excessive accumulation enters the sand inlet 24, so that the spiral conveying plate 26 can convey the silt to the outside along the cleaning pipe 23, wherein one end of the spiral conveying plate 26, which is close to the auger shaft 25, is lower and is higher than the outer end of the cleaning pipe 23, so that when the spiral conveying plate 26 conveys the silt upwards, a gap exists between the two, and the auger shaft 25 has an angle relative to the vertical axis, the circular plate 12 and the ring support plate 11 are in rotating connection, so that the ring support plate 11 rotates around the circular plate 12 in a direction opposite to the rotating direction of the centrifugal fan blades 15 (as shown in fig. 2 and 4, helical gears 27 are positioned on the outer sides of the ring gear rings 28, the received revolution direction is opposite, and the rotation direction is also opposite), the cleaning pipe 23 revolves, the circular truncated cone ring plate 10 also revolves, the centrifugally rotated sewage at the most edge is decelerated under opposite action, the silt in the sewage can be rapidly settled, and the cleaning pipe 23 revolves to displace the sand inlet 24, so that the cleaning of the silt is better;

as a further scheme of the invention, an air blowing mechanism for blowing gravel to move is arranged below the auger shaft 25, the air blowing mechanism comprises an air guide cavity 30 arranged at the bottom surface of the auger shaft 25, an air guide hole 31 communicated with the air guide cavity 30 is formed in the auger shaft 25, a turbulent fan blade 32 positioned on one side of the air guide hole 31 is fixed on the side wall of the auger shaft 25, a bent head 33 is rotatably arranged at the lower end of the auger shaft 25, and an air guide structure for guiding air is arranged at the lower end of the bent head 33; the air guide structure comprises a C-shaped ring plate 35 with a C-shaped section, the circle center of the C-shaped ring plate 35 is located on the axis of the hollow tube 14, a compensation ring plate 37 used for forming a sealed cavity with the C-shaped ring plate 35 is assembled in the C-shaped ring plate 35 in a rotating mode, the pipe corner 33 is fixedly connected with the compensation ring plate 37 and communicated with the sealed cavity, and a transverse tube 36 used for communicating the sealed cavity with the hollow tube 14 is fixedly connected to the C-shaped ring plate 35.

When the invention is used, as shown in fig. 4, when the air blowing mechanism and the air guide structure work, compressed air can be continuously input into the corner 33, so that the air guide cavity 30 is filled with air, the air in the air guide cavity 30 is output to the lower end of the sand inlet 24 from the air guide hole 31, then the turbulent fan blades 32 are driven by the rotating auger shaft 25 to bulge silt at the upper ends of the circular plate 12 and the circular ring plate 11 between the side wall of the bedplate 13 and the inner wall of the circular table ring plate 10, and the bulged silt can be centrifugally thrown outwards along with sewage again and accurately enters the sand inlet 24, so that the silt is cleaned, the silt is prevented from being accumulated at the rotating positions of the circular ring support plate 11 and the circular plate 12 for a long time, abnormal abrasion of equipment is avoided, and the fixed-point sand blowing is adopted, so that the silt is prevented from being lifted and the sewage is repeatedly centrifuged again along with a large area, and the cleaning efficiency is low;

as shown in fig. 2 and 5, the compressed gas is branched from the hollow pipe 14 and enters the transverse pipe 36, the transverse pipe 36 drives the C-ring plate 35 to rotate, the rotation of the C-ring plate 35 and the compensation ring plate 37 have a rotation difference, so that the gas is refilled into the pipe bender 33, and the compensation communication is completed (as shown in fig. 4 and 6, the ring gear 28 is also fixedly arranged on the end surface of the C-ring plate 35, so that the ring gear 28 can smoothly drive the bevel gear 27 to rotate, and the compensation ring plate 37 and the C-ring plate 35 have a rotation deviation when revolving along with the auger shaft 25, so that the asynchronous rotation of the transverse pipe 36 and the pipe bender 33 is compensated).

As a further scheme of the invention, the top of the side wall of the cleaning pipe 23 positioned on the circular truncated cone annular plate 10 is provided with a sand discharge port 40 for discharging sand; the design of the sand outlet 40 enables the auger shaft 25 and the spiral conveying plate 26 to quickly discharge silt out of the cleaning pipe 23, thereby avoiding the problem that the cleaning pipe 23 is blocked.

The motor 9 adopts a speed reducing motor, so that the equipment can obtain larger torque.

The rotating contact surfaces of the circular plate 12 and the ring carrier plate 11 are coated with antifriction materials, so that the friction of the equipment can be reduced, and the service life of the equipment can be prolonged.

Claims

1. The utility model provides a centrifugal separation processing apparatus of oily sewage which characterized in that: the oil injection device comprises a motor (9) and a circular truncated cone annular plate (10), a circular truncated cone annular plate (11) is fixedly arranged on the lower end face of the circular truncated cone annular plate (10), a circular plate (12) is rotatably arranged in the center of the circular plate (11), a backflow-preventing bedplate (13) is fixedly arranged on the top face of the circular plate (12), a hollow pipe (14) is rotatably connected to the middle portions of the circular plate (12) and the bedplate (13) together, centrifugal fan blades (15) used for stirring water flow are fixed on the side wall of the hollow pipe (14), a dome-shaped splitter plate (16) is fixedly arranged on the upper portion of the inner wall of the circular truncated cone annular plate (10), a through hole (17) used for oil discharge is formed in the center of the splitter plate (16), an oil injection pipe (18) is arranged right above the hollow pipe (14), the pipe diameter of the oil injection pipe (18) is smaller than that of the hollow pipe (14), and the bottom end of the oil injection pipe (18) extends into the hollow pipe (14), annotate the top of liquid pipe (18) and extend to flow distribution plate (16) top, annotate liquid pipe (18) and be used for in leading-in hollow tube (14) of oily sewage, and annotate liquid pipe (18) and flow distribution plate (16) fixed mounting, flow distribution plate (16) top is equipped with upper flow pipe (19) that run through round platform crown plate (10) lateral wall, flow distribution plate (16) below is equipped with downpipe (20) that run through round platform crown plate (10) lateral wall, interval between upper flow pipe (19) and downpipe (20) is the same with the thickness of flow distribution plate (16), still be equipped with cleaning device on round platform crown plate (10), cleaning device absorbs the grit of sediment and carries out round platform crown plate (10) with it.

2. The apparatus for centrifugal separation treatment of oily sewage according to claim 1, characterized in that: cleaning device is including fixing cleaning tube (23) on round platform crown plate (10) inside wall, cleaning tube (23) bottom mounting sets up on ring support plate (11) top surface, cleaning tube (23) bottom lateral wall has been seted up into sand mouth (24), auger shaft (25) are installed to the coaxial line in cleaning tube (23), auger shaft (25) both ends all rotate with cleaning tube (23) and are connected, and install on auger shaft (25) and carry the gravel to spiral delivery board (26) at cleaning tube (23) top, still be connected with the transmission who is used for driving its rotation on auger shaft (25).

3. The apparatus for centrifugal separation treatment of oily sewage according to claim 2, characterized in that: the transmission device comprises a helical gear (27) fixedly arranged at the bottom of the auger shaft (25), and the helical gear (27) is meshed with a ring gear (28) fixedly assembled with the hollow pipe (14).

4. The apparatus for centrifugal separation treatment of oily sewage according to claim 3, characterized in that: auger axle (25) below is equipped with the mechanism of blowing that is used for drumming the gravel motion, the mechanism of blowing is including seting up air guide cavity (30) in auger axle (25) bottom surface, set up air guide hole (31) with air guide cavity (30) intercommunication on auger axle (25), be fixed with vortex flabellum (32) that are located air guide hole (31) one side on auger axle (25) lateral wall, auger axle (25) lower extreme rotates and is provided with corner (33), corner (33) lower extreme is provided with the air guide structure that is used for the air guide.

5. The apparatus for centrifugal separation treatment of oily sewage according to claim 4, wherein: the air guide structure includes C crown plate (35) that the cross-section is the C type, the centre of a circle of C crown plate (35) is located on the axis of hollow tube (14), C crown plate (35) internal rotation is equipped with compensation crown plate (37) that are used for forming seal chamber with sealed C crown plate (35), corner (33) and compensation crown plate (37) fixed connection and with seal chamber intercommunication, fixedly connected with is used for communicateing transverse pipe (36) of seal chamber and hollow tube (14) on C crown plate (35).

6. The apparatus for centrifugal separation treatment of oily sewage according to claim 2, characterized in that: the top of the side wall of the cleaning pipe (23) positioned on the circular truncated cone annular plate (10) is provided with a sand discharge port (40) for discharging sand gravel.

7. The apparatus for centrifugal separation treatment of oily sewage according to claim 1, characterized in that: the motor (9) adopts a speed reducing motor which can obtain larger torque.

8. The apparatus for centrifugal separation treatment of oily sewage according to claim 1, wherein: still including being used for driving hollow tube (14) pivoted drive structure, drive structure includes outer ring gear, gear and motor (9), motor (9) and round platform crown plate (10) fixed mounting, and the output shaft tip and the gear fixed mounting of motor (9), outer ring gear suit is fixed on hollow tube (14) lateral wall, and outer ring gear and gear engagement assembly.