Cyclone oil removal treatment device and method for oily wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and provides a rotational flow oil removal treatment device and method.The rotational flow oil removal treatment device comprises a rotational flow tank, a top cover, supporting legs, a blow-off pipe, a bearing pedestal, a center rod, rotational flow fan blades, a first driving assembly and a second driving assembly; the bearing seat is arranged at the bottom of the rotational flow tank, the first rod is hollow, one end of the first rod penetrates through the bearing seat, the other end of the first rod is located in the rotational flow tank, and the first driving assembly is connected with the first rod and used for driving the first rod to rotate; the rotational flow fan blade is arranged on the first rod and is positioned in the rotational flow tank; the second rod is movably arranged on the first rod, and the second driving assembly is connected with the second rod and used for driving the second rod to move linearly. The device has the effect of conveniently adjusting the position of the oil discharge outlet.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a cyclone oil removal device and method for oily wastewater. Background Technology

[0002] Industrial production such as petrochemicals, steel and coal processing, machinery processing, and food processing, as well as daily life, generate large amounts of oily wastewater. Oil has a serious impact on ecosystems, soil, and water bodies. Floating oil flowing into water bodies can form an oil film that cuts off the oxygen source. Furthermore, the decomposition of emulsified and dissolved oil in the water by microorganisms consumes dissolved oxygen, leading to oxygen deficiency in the water, making it impossible for fish and aquatic organisms to survive. Oily wastewater entering the soil can also form an oil film, hindering the reproduction of soil microorganisms and damaging the soil's granular structure.

[0003] The hydrocyclone oil removal device (also known as a hydrocyclone oil separator or hydrocyclone oil-water separator) is a high-efficiency oil-water separation device designed based on centrifugal separation technology. It is mainly used to remove non-emulsified oil and some emulsified oil from oily wastewater and is widely used in oily wastewater treatment scenarios in petrochemical, steel metallurgy, shipbuilding, and machinery processing industries.

[0004] Existing hydrocyclone oil separation devices remove the upper layer of oil by utilizing the oil-water stratification formed after wastewater passes through a cyclone. However, the oil discharge port is generally fixed in the discharge stage, making it impossible to adjust its position according to the location of the oil-water interface. This can easily affect the overall oil-water separation effect and therefore needs improvement. Summary of the Invention

[0005] To facilitate the adjustment of the position of the oil outlet and control the relative distance between the oil outlet and the oil-water interface, this application provides a cyclone oil removal treatment device for oily wastewater.

[0006] Firstly, the cyclone oil removal device for oily wastewater provided in this application adopts the following technical solution: A hydrocyclone oil removal treatment device for oily wastewater includes a hydrocyclone tank, a top cover, support feet, a drain pipe, a bearing seat, a central rod, hydrocyclone fan blades, a first drive assembly, and a second drive assembly. The top cover is located at the opening of the hydrocyclone tank, and the support feet are located at the bottom of the hydrocyclone tank. The drain pipe is connected to the hydrocyclone tank and is used to discharge wastewater into the interior of the hydrocyclone tank. The central rod is vertically arranged and rotatably connected to the inside of the cyclone tank. The central rod includes a first rod and a second rod. The bearing seat is located at the bottom of the cyclone tank. The first rod is hollow, with one end passing through the bearing seat and the other end located inside the cyclone tank. The first drive assembly is connected to the first rod and is used to drive the first rod to rotate. The cyclone fan blades are arranged on the first rod and located inside the cyclone tank. The second rod and the first rod are coaxially arranged and located inside the cyclone tank. The second rod is movably mounted on the first rod. The second rod is hollow and has an oil drain port through its side wall. The cavities inside the first rod and the second rod are used for discharging waste oil. The second drive assembly is connected to the second rod and is used to drive the second rod to move linearly.

[0007] By adopting the above technical solution, the wastewater enters the interior of the cyclone tank through the sewage pipe, and then the first drive component drives the entire central rod to rotate, thereby driving the cyclone fan blades to rotate synchronously; based on the characteristics of the density difference between oil and water, the centrifugal force generated by the cyclone causes the wastewater to gradually form an oil-water stratification during the rotation process.

[0008] After the oil and water layers separate into swirls, the second drive component controls the second rod to move linearly relative to the first rod, changing the position of the oil drain port. This allows the upper oil layer to enter the drain port and then be discharged from the interior of both the second and first rods, thus completing the oil drainage process. The rotation of the first rod synchronously drives the rotation of the second rod, and the second rod can also move relative to the first rod, ensuring that the oil drain port is always positioned above the oil-water interface. As the thickness of the oil layer gradually decreases, the oil drain port can be adjusted downwards to facilitate better drainage of the oil.

[0009] Preferably, the first drive assembly is located outside the cyclone tank. The first drive assembly includes a first gear, a second gear, and a drive motor. The first gear is located on the output shaft of the drive motor, and the second gear is coaxially located on the first rod and meshes with the first gear.

[0010] By adopting the above technical solution, the drive motor can drive the first gear to rotate, thereby driving the second gear to rotate, thus realizing the rotation of the first rod. The presence of the bearing housing allows the first rod and the cyclone tank to rotate relative to each other, while also providing support for the first rod and ensuring its normal operation.

[0011] Preferably, the second drive assembly includes a linear cylinder and a moving block. The end of the second rod away from the first rod is rotatably connected to the moving block via a bearing. The linear cylinder is connected to the moving block and is used to control the vertical movement of the moving block. A guide strip is connected to the outer wall of the first rod, and a corresponding guide groove is provided on the inner wall of the second rod. The guide strip is located in the guide groove.

[0012] By adopting the above technical solution, the linear cylinder can drive the moving block to move up and down vertically, thereby controlling the second rod to move linearly along the first rod. One end of the second rod is connected to the moving block via a bearing, enabling relative rotation between the second rod and the moving block. The cooperation between the guide bar and the guide groove connects the first and second rods, facilitating the rotation of the first rod to drive the second rod to rotate.

[0013] Preferably, a sealing ring is fixedly provided on the outer wall of the first rod, and the sealing ring is located between the second rod and the first rod; a sealing bushing is provided at the connection between the first rod and the bearing seat.

[0014] By adopting the above technical solution, the sealing ring can increase the sealing performance between the first rod and the second rod, preventing wastewater from the aqueous phase layer from entering the interior of the first rod. The second rod overcomes the static friction of the sealing ring and performs work to achieve relative movement with the first rod.

[0015] Preferably, it also includes a drain pipe, which is located at the bottom of the vortex tank and communicates with the vortex tank.

[0016] By adopting the above technical solution, the separated water is discharged from the drain port at the bottom of the cyclone tank, thus achieving oil-water separation.

[0017] Preferably, the system further includes a filter tank, a filter screen, and an inlet pipe. The filter tank is located on one side of the cyclone tank, the filter screen is disposed inside the filter tank, the inlet pipe is connected to the filter tank and located above the filter screen, and the drain pipe is located below the filter screen and connected to the filter tank.

[0018] By adopting the above technical solution, the wastewater may contain some solid impurities. Filtration is required before oil-water separation to reduce damage to the cyclone separator blades. The wastewater first enters the filter tank through the inlet pipe, then passes through the filter screen from top to bottom, where the screen traps impurities. The filtered wastewater falls to the bottom of the filter tank and is then transported to the cyclone separator for further separation.

[0019] Preferably, it further includes a rotating shaft and a third drive assembly. The rotating shaft is rotatably connected to the filter tank, and the filter screen is disposed on the rotating shaft. The bottom of the filter tank has a discharge port, and a sealing plug is sealed at the discharge port. The third drive assembly is connected to both the rotating shaft and the sealing plug. When the sealing plug is disengaged from the discharge port, the rotating shaft rotates 180°, causing the filter screen to face the discharge port.

[0020] By adopting the above technical solution, the filter tank needs to be cleaned after the entire device stops operating. At this time, the third drive component can be activated to control the sealing plug to disengage from the discharge port. During the movement of the sealing plug, the rotating shaft will rotate synchronously. After the rotating shaft rotates 180°, the sealing plug stops moving, causing the filter screen to flip over and face the discharge port. The garbage inside the filter screen will fall to the bottom of the filter tank and be discharged from the discharge port.

[0021] Preferably, the third drive assembly includes a pneumatic cylinder, a rack, and a gear. The rack is vertically arranged, and the pneumatic cylinder is connected to the rack to drive the rack to move up and down. The gear is coaxially arranged on the rotating shaft and located outside the filter tank. The gear meshes with the rack, and the sealing plug is connected to the rack. The pneumatic cylinder has a stroke control mechanism.

[0022] By adopting the above technical solution, the pneumatic cylinder controls the rack to move linearly in the vertical direction, thereby causing the sealing plug to disengage or press against the discharge port. During the movement of the rack, the rack can drive the gear components to rotate, thereby rotating the rotating shaft and the filter screen.

[0023] The cylinder is equipped with a stroke control mechanism, which can control the cylinder piston rod to stop at a predetermined position, realizing precise mechanical actions (such as clamping, pushing, lifting, etc.), and can provide continuous, stable and reliable pressure to ensure that the sealing plug is stably pressed against the filter canister. Typical stroke control mechanisms include, but are not limited to, mechanical stops, magnetic switches with solenoid valves, and displacement sensors with controllers. These are existing technologies and will not be elaborated here.

[0024] Secondly, this application also provides a cyclone oil removal treatment method for oily wastewater, which uses a cyclone oil removal treatment device with all the above-described structures to treat the wastewater, including the following steps: S1. Wastewater enters the interior of the cyclone tank through the drain pipe, and then the first drive component drives the entire central rod to rotate, thereby driving the cyclone fan blades to rotate synchronously; based on the characteristics of the density difference between oil and water, the centrifugal force generated by the cyclone causes the wastewater to gradually form oil-water stratification during the rotation process. S2. After the oil and water swirl and separate into layers, the second drive component is used to control the second rod to move linearly relative to the first rod, changing the position of the oil drain port so that the upper oil layer enters the oil drain port and is then discharged from the inside of the second rod and the first rod, thus realizing the oil draining process.

[0025] In summary, this application includes at least one of the following beneficial technical effects: (1) By setting the center rod as the first rod and the second rod, the first drive assembly can drive the first rod and the second rod to rotate simultaneously, and the second drive assembly can control the second rod to move linearly relative to the first rod, thereby changing the position of the oil outlet and making it convenient for staff to make reasonable adjustments according to the actual wastewater treatment situation.

[0026] (2) By setting a sealing ring, the sealing ring can increase the sealing between the first rod and the second rod, and prevent water in the aqueous phase layer from seeping into the interior of the first rod and the second rod.

[0027] (3) By setting up a filter tank and a filter screen, the filter screen can filter impurities in the wastewater, reduce the damage of impurities to the cyclone fan blades, and improve the safety of the device operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a cyclone oil removal device in one embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a cyclone degreasing device in one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a cyclone degreasing device in another embodiment of this application; Figure 4 This is a cross-sectional schematic diagram of a cyclone degreasing device in another embodiment of this application.

[0029] Reference numerals: 1. Cyclone tank; 2. Top cover; 3. Support foot; 4. Drain pipe; 5. Bearing seat; 6. Center rod; 61. First rod; 62. Second rod; 7. Cyclone fan blade; 8. First drive assembly; 81. First gear; 82. Second gear; 83. Drive motor; 9. Second drive assembly; 91. Linear cylinder; 92. Moving block; 10. Guide bar; 11. Sealing ring; 12. Filter tank; 13. Liquid inlet pipe; 14. Rotating shaft; 15. Third drive assembly; 151. Pneumatic cylinder; 152. Rack; 153. Gear component; 16. Filter screen; 17. Discharge port; 18. Sealing plug; 19. Drain pipe; 20. Oil drain port. Detailed Implementation

[0030] The technical solutions of this application will now be described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can be embodied in many different forms and is not limited to the embodiments described herein.

[0031] In the representation of this application, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection; a detachable connection; an integral part; or a mechanical connection. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Without conflict, those skilled in the art can combine and integrate the different embodiments or examples shown in this application, as well as the features of those embodiments or examples.

[0035] This application discloses a cyclone oil removal device for oily wastewater. (Refer to...) Figure 1 and Figure 2 The cyclone oil removal device includes a cyclone tank 1, a top cover 2, support feet 3, a drain pipe 4, a bearing seat 5, a central rod 6, cyclone fan blades 7, a first drive assembly 8, and a second drive assembly 9. The top cover 2 is installed at the opening of the cyclone tank 1, and the support feet 3 are fixedly connected to the bottom of the cyclone tank 1 to support it. The drain pipe 4 is connected to the cyclone tank 1 and is used to discharge wastewater into the cyclone tank 1.

[0036] Specifically, the central rod 6 is vertically arranged and rotatably connected inside the cyclone tank 1. The central rod 6 includes a first rod 61 and a second rod 62 connected to each other. The bearing seat 5 is fixedly installed at the bottom of the cyclone tank 1. The first rod 61 is hollow and fixedly installed on the bearing seat 5. One end of the first rod 61 is located outside the cyclone tank 1, and the other end is located inside the cyclone tank 1. The first drive assembly 8 is connected to the first rod 61 and is used to drive the first rod 61 to rotate. The cyclone fan blades 7 are fixedly installed on the first rod 61 and located inside the cyclone tank 1. The cyclone fan blades 7 are distributed circumferentially along the first rod 61.

[0037] The second rod 62 is coaxially arranged with the first rod 61 and located inside the cyclone tank 1. The second rod 62 is movably connected to the first rod 61 and moves along the length of the first rod 61. The second rod 62 is hollow and has an oil drain port 20 extending through its side wall. The cavities inside the first rod 61 and the second rod 62 are used for discharging waste oil. The second drive assembly 9 is connected to the second rod 62 and is used to drive the second rod 62 to move linearly.

[0038] The first drive assembly 8 is installed outside the cyclone tank 1. The first drive assembly 8 includes a first gear 81, a second gear 82, and a drive motor 83. The first gear 81 is fixedly connected to the output shaft of the drive motor 83, and the second gear 82 is coaxially connected to the first rod 61 and meshes with the first gear 81. The drive motor 83 can drive the first gear 81 to rotate, thereby driving the second gear 82 to rotate, realizing the rotation of the first rod 61. The bearing housing 5 allows the first rod 61 and the cyclone tank 1 to rotate relative to each other, and also provides support for the first rod 61, ensuring its normal operation.

[0039] The second drive assembly 9 includes a linear cylinder 91 and a moving block 92. The end of the second rod 62 furthest from the first rod 61 is rotatably connected to the moving block 92 via a bearing, enabling relative rotation between the second rod 62 and the moving block 92. The piston rod of the linear cylinder 91 is connected to the moving block 92 to control its vertical movement. A guide strip 10 is fixedly connected to the outer wall of the first rod 61, extending along its length. A corresponding guide groove is formed on the inner wall of the second rod 62, with the guide strip 10 positioned within it. The cooperation between the guide strip 10 and the guide groove connects the first rod 61 and the second rod 62, facilitating rotation of the second rod 62 when the first rod 61 rotates. Multiple guide strips 10 can be arranged in parallel, with the number of guide grooves equal to the number of guide strips 10.

[0040] Wastewater enters the interior of the cyclone tank 1 through the drain pipe 4, and then the first drive assembly 8 drives the entire central rod 6 to rotate, thereby driving the cyclone fan blades 7 to rotate synchronously; based on the characteristics of the density difference between oil and water, the centrifugal force generated by the cyclone causes the wastewater to gradually form an oil-water stratification during the rotation process.

[0041] After the oil and water swirl and separate, the second drive assembly 9 controls the second rod 62 to move linearly relative to the first rod 61, changing the position of the oil drain port 20. This allows the upper oil layer to enter the drain port 20 and then be discharged from the interior of both the second rod 62 and the first rod 61, thus completing the oil drainage process. The rotation of the first rod 61 synchronously drives the rotation of the second rod 62, and the second rod 62 can also move relative to the first rod 61, ensuring that the oil drain port 20 is always positioned above the oil-water interface. As the thickness of the oil layer gradually decreases, the oil drain port 20 can be adjusted downwards to facilitate better drainage of the oil.

[0042] A sealing ring 11 is fixedly installed on the outer wall of the first rod 61, located between the second rod 62 and the first rod 61, above the guide strip 10. The sealing ring 11 enhances the sealing performance between the first rod 61 and the second rod 62, preventing wastewater from the aqueous phase layer from entering the interior of the first rod 61. The second rod 62 overcomes the static friction of the sealing ring 11, achieving relative movement with the first rod 61. A sealing bushing is also installed at the connection between the first rod 61 and the bearing seat 5. This bushing prevents wastewater inside the cyclone tank 1 from leaking out through the gap between the first rod 61 and the bearing seat 5, ensuring the sealing performance of the cyclone tank 1. Other dynamic sealing methods from existing technologies can also be used. A drain pipe 19 is fixedly installed at the bottom of the cyclone tank 1, communicating with the interior of the cyclone tank 1. The drain pipe 19 is opened and closed via a valve. The separated water is discharged from the drain port at the bottom of the cyclone tank 1, achieving oil-water separation.

[0043] Reference Figure 3 and Figure 4 In addition, in some embodiments, a filter tank 12 is provided on one side of the cyclone tank 1. An inlet pipe 13 is connected to the top of the filter tank 12, which is used to supply wastewater into the filter tank 12. A rotating shaft 14 and a third drive assembly 15 are respectively installed on the filter tank 12. The rotating shaft 14 is horizontally positioned and rotatably connected inside the filter tank 12. A filter screen 16 is fixed on the rotating shaft 14, located below the inlet pipe 13, for filtering the wastewater entering the filter tank 12. A drain pipe 4 is connected to the bottom of the filter tank 12, and is located below the filter screen 16.

[0044] The bottom of the filter tank 12 has a discharge port 17, and a sealing plug 18 is provided at the discharge port 17. The sealing plug 18 is detachably connected to the filter tank 12. The third drive assembly 15 is connected to both the rotating shaft 14 and the sealing plug 18. When the sealing plug 18 is disengaged from the discharge port 17, the rotating shaft 14 rotates 180°, so that the filter screen 16 faces the discharge port 17.

[0045] The third drive assembly 15 includes a pneumatic cylinder 151, a rack 152, and a gear 153. The rack 152 is vertically arranged, and the piston rod of the pneumatic cylinder 151 is connected to the rack 152 to drive the rack 152 to move up and down. One end of the rotating shaft 14 extends to the outside of the filter tank 12. The gear 153 is coaxially arranged on the rotating shaft 14 and located outside the filter tank 12. The gear 153 meshes with the rack 152, and the sealing plug 18 is connected to the rack 152. The pneumatic cylinder 151 has a stroke control mechanism. The pneumatic cylinder 151 controls the rack 152 to move linearly in the vertical direction, thereby causing the sealing plug 18 to disengage or press against the discharge port 17. During the movement of the rack 152, the rack 152 can drive the gear 153 to rotate, realizing the rotation of the rotating shaft 14 and the filter screen 16.

[0046] Because the wastewater may contain some solid impurities, filtration is required before oil-water separation to reduce damage to the cyclone fan blades 7. The wastewater first enters the filter tank 12 through the inlet pipe 13, then passes through the filter screen 16 from top to bottom, where the filter screen 16 traps the impurities. The filtered wastewater falls to the bottom of the filter tank 12 and is then transported to the cyclone tank 1 for separation. After the entire device stops operating, the filter tank 12 needs to be cleaned. At this time, the third drive assembly 15 can be activated to control the sealing plug 18 to disengage from the discharge port 17. During the movement of the sealing plug 18, the rotating shaft 14 rotates synchronously. After the rotating shaft 14 rotates 180°, the sealing plug 18 stops moving, causing the filter screen 16 to flip and face the discharge port 17. The debris inside the filter screen 16 falls to the bottom of the filter tank 12 and is discharged from the discharge port 17. At the same time, staff can inject clean water into the inlet pipe 13. The clean water impacts the filter screen 16, which serves to rinse the filter screen 16. Some residues in the filter tank 12 can also be washed away by the clean water.

[0047] The implementation principle of a hydrocyclone oil removal device for oily wastewater according to an embodiment of this application is as follows: Wastewater enters the interior of the hydrocyclone tank 1 through the drain pipe 4, and then the drive motor 83 controls the first rod 61 and the second rod 62 to rotate, thereby driving the hydrocyclone fan blades 7 to rotate synchronously. Based on the characteristics of the density difference between oil and water, the centrifugal force generated by the cyclone causes the wastewater to gradually form oil-water stratification during the rotation process.

[0048] After the oil and water swirl and separate, the linear cylinder 91 controls the second rod 62 to move linearly relative to the first rod 61, changing the position of the oil drain port 20. This allows the upper oil layer to enter the drain port 20 and then be discharged from the interior of both the second rod 62 and the first rod 61, thus completing the oil drainage process. The rotation of the first rod 61 synchronously drives the rotation of the second rod 62, and the second rod 62 can also move relative to the first rod 61, ensuring that the oil drain port 20 is always positioned above the oil-water interface. As the thickness of the oil layer gradually decreases, the oil drain port 20 can be adjusted downwards to facilitate better drainage and ensure effective sludge removal.

[0049] Based on the above embodiments, this application also provides a cyclone oil removal treatment method for oily wastewater, which uses a cyclone oil removal treatment device with all the above structures to treat the wastewater, including the following steps: Wastewater first enters the filter tank 12 through the inlet pipe 13, and then passes through the filter screen 16 from top to bottom. The filter screen 16 traps impurities in the wastewater, and the filtered wastewater falls to the bottom of the filter tank 12. After the filtered wastewater enters the cyclone tank 1 through the drain pipe 4, the first drive assembly 8 is activated to drive the entire central rod 6 to rotate, which in turn drives the cyclone fan blades 7 to rotate synchronously. Relying on the difference in density between oil and water, and with the centrifugal force generated by the cyclone, the wastewater gradually forms an oil-water stratification during the rotation process.

[0050] After the oil and water separate into layers through swirling, the second drive assembly 9 is activated to control the second rod 62 to move linearly relative to the first rod 61, adjusting the position of the oil drain port 20 so that the upper layer of oil enters the drain port 20 and is then discharged through the interior of the second rod 62 and the first rod 61, thus completing the oil drainage operation. When the first rod 61 rotates, it can synchronously drive the second rod 62 to rotate, and at the same time, the second rod 62 can move relative to the first rod 61 to ensure that the oil drain port 20 is always above the oil-water interface. As the thickness of the oil layer gradually decreases, the oil drain port 20 can be controlled to move downwards appropriately to facilitate smoother discharge of oil from the drain port 20.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydrocyclone oil removal treatment device for oily wastewater, characterized in that, The device includes a cyclone tank (1), a top cover (2), support feet (3), a drain pipe (4), a bearing seat (5), a center rod (6), cyclone fan blades (7), a first drive assembly (8), and a second drive assembly (9). The top cover (2) is located at the opening of the cyclone tank (1), and the support feet (3) are located at the bottom of the cyclone tank (1). The drain pipe (4) is connected to the cyclone tank (1) and is used to discharge wastewater into the cyclone tank (1). The central rod (6) is vertically arranged and rotatably connected to the inside of the cyclone tank (1). The central rod (6) includes a first rod (61) and a second rod (62). The bearing seat (5) is located at the bottom of the cyclone tank (1). The first rod (61) is hollow and one end passes through the bearing seat (5). The other end of the first rod (61) is located inside the cyclone tank (1). The first drive assembly (8) is connected to the first rod (61) and is used to drive the first rod (61) to rotate. The cyclone fan blade (7) is arranged on the first rod (61) and is located inside the cyclone tank (1). The second rod (62) and the first rod (61) are coaxially arranged and located inside the cyclone tank (1). The second rod (62) is movably arranged on the first rod (61). The second rod (62) is hollow and has an oil drain port (20) through it on its side wall. The cavities inside the first rod (61) and the second rod (62) are used for discharging waste oil. The second drive assembly (9) is connected to the second rod (62) and is used to drive the second rod (62) to move linearly.

2. The hydrocyclone oil removal device for oily wastewater according to claim 1, characterized in that, The first drive assembly (8) is located outside the cyclone tank (1). The first drive assembly (8) includes a first gear (81), a second gear (82) and a drive motor (83). The first gear (81) is located on the output shaft of the drive motor (83). The second gear (82) is coaxially located on the first rod (61) and meshes with the first gear (81).

3. The hydrocyclone oil removal device for oily wastewater according to claim 1, characterized in that, The second drive assembly (9) includes a linear cylinder (91) and a moving block (92). The end of the second rod (62) away from the first rod (61) is rotatably connected to the moving block (92) via a bearing. The linear cylinder (91) is connected to the moving block (92) and is used to control the vertical movement of the moving block (92). A guide strip (10) is connected to the outer wall of the first rod (61), and a guide groove is correspondingly opened on the inner wall of the second rod (62). The guide strip (10) is located in the guide groove.

4. The hydrocyclone oil removal device for oily wastewater according to claim 3, characterized in that, A sealing ring (11) is fixedly provided on the outer wall of the first rod (61), and the sealing ring (11) is located between the second rod (62) and the first rod (61); a sealing bushing is provided at the connection between the first rod (61) and the bearing seat (5).

5. A hydrocyclone oil removal device for oily wastewater according to claim 1, characterized in that, It also includes a drain pipe (19), which is located at the bottom of the vortex tank (1) and is connected to the vortex tank (1).

6. The hydrocyclone oil removal device for oily wastewater according to claim 1, characterized in that, It also includes a filter tank (12), a filter screen (16) and an inlet pipe (13). The filter tank (12) is located on one side of the cyclone tank (1). The filter screen (16) is located inside the filter tank (12). The inlet pipe (13) is connected to the filter tank (12) and is located above the filter screen (16). The drain pipe (4) is located below the filter screen (16) and is connected to the filter tank (12).

7. A hydrocyclone oil removal device for oily wastewater according to claim 6, characterized in that, It also includes a rotating shaft (14) and a third drive assembly (15). The rotating shaft (14) is rotatably connected to the filter tank (12), and the filter screen (16) is disposed on the rotating shaft (14). The bottom of the filter tank (12) is provided with a discharge port (17), and a sealing plug (18) is provided at the discharge port (17). The third drive assembly (15) is connected to both the rotating shaft (14) and the sealing plug (18). When the sealing plug (18) is disengaged from the discharge port (17), the rotating shaft (14) rotates 180°, so that the filter screen (16) faces the discharge port (17).

8. A hydrocyclone oil removal device for oily wastewater according to claim 7, characterized in that, The third drive assembly (15) includes a pneumatic cylinder (151), a rack (152), and a gear (153). The rack (152) is vertically arranged, and the pneumatic cylinder (151) is connected to the rack (152) to drive the rack (152) to move up and down. The gear (153) is coaxially arranged on the rotating shaft (14) and located outside the filter tank (12). The gear (153) meshes with the rack (152), and the sealing plug (18) is connected to the rack (152). The pneumatic cylinder (151) has a stroke control mechanism.

9. A method for treating oily wastewater by hydrocyclone oil removal, comprising using a hydrocyclone oil removal device as described in any one of claims 1 to 8 to treat the wastewater, characterized in that, Includes the following steps: S1. Wastewater enters the interior of the cyclone tank (1) through the drain pipe (4), and then the first drive assembly (8) drives the entire central rod (6) to rotate, thereby driving the cyclone fan blades (7) to rotate synchronously. Based on the characteristics of the oil-water density difference, the centrifugal force generated by the cyclone causes the wastewater to gradually form an oil-water stratification during the rotation process. S2. After the oil and water swirl and separate, the second drive component (9) controls the second rod (62) to move linearly relative to the first rod (61), changing the position of the oil drain port (20), so that the upper oil layer enters the oil drain port (20) and is then discharged from the inside of the second rod (62) and the first rod (61) to realize the oil drain process.

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