An oil-water separation device for waste liquid treatment

Abstract

The application discloses an oil-water separation device for waste liquid treatment, which comprises an oil separation tank with an open top, wherein the oil separation tank comprises a tank bottom, a sedimentation part, a transition part and a separation part, the separation part is provided with an overflow port at one end, and the oil separation tank further comprises an oil groove; an oil scraping assembly comprising an oil scraping plate and a translation unit; and an aeration assembly comprising a main pipe, a branch pipe, a hose and a rotating unit, wherein the main pipe is used for connecting an aerator at an end far from the branch pipe, the branch pipe is provided with a first aeration port, and the branch pipe is connected with a floating block. The oil-water separation device for waste liquid treatment is characterized in that the length and width dimensions of the separation part are designed to be smaller than the corresponding dimensions of the sedimentation part, the thickness dimension of the oil layer after standing is increased, the oil-water interface is more stable, the separation effect is improved, the branch pipe keeps close to the inner wall of the sedimentation part while the main pipe is rotated by the rotating unit, the bubble activity range is expanded, the contact probability of bubbles and oil droplets is increased, the inner wall of the oil separation tank is cleaned, the separation efficiency is improved, and the cleaning burden of workers is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation technology, and in particular to an oil-water separation device for waste liquid treatment. Background Technology

[0002] In many fields such as industrial production and catering operations, a large amount of waste liquid containing oil pollutants is generated. If such waste liquid is discharged directly, it will cause serious pollution to the water environment, disrupt the ecological balance, and violate environmental protection emission standards. Therefore, oil-water separation is an important part of the waste liquid treatment process, and its separation effect directly determines the compliance rate and environmental safety of waste liquid discharge.

[0003] In existing technologies, waste liquid is typically introduced into an oil separator and allowed to settle, relying on the density difference between oil and water to achieve natural stratification. The surface oil is then scraped off using an oil skimmer. However, in these oil-water separation devices, the oil separator is usually a rectangular structure. Because the oil content in the waste liquid is typically low (relative to water), the oil layer at the top of the waste liquid after settling is only 1-3 cm thick. Existing centralized oil skimmers have a fixed bottom position for the skimmer blades, which affects the oil content of the introduced waste liquid. Furthermore, the amount of waste liquid introduced fluctuates. In actual oil-water separation, it is difficult to precisely control the bottom of the skimmer blades between the oil and water layers. Often, the skimmer blades are too high or too low. If too high, the oil in the wastewater cannot be completely removed; if too low, the scraped oil will contain a large amount of... Moisture content leads to poor oil-water separation. Furthermore, to improve separation efficiency, aerators are typically used to introduce numerous microbubbles into the oil separator, utilizing their buoyancy to promote oil droplet buoyancy and stratification. However, the bubbles generated by the aerator usually rise along a fixed path within the separator, making it difficult to fully contact the oil droplets in the waste liquid, thus limiting the effectiveness of oil-water separation. Moreover, during oil stratification, some oil droplets adhere to the inner wall of the separator, forming sludge inside. This sludge easily accumulates on the separator walls, further reducing separation efficiency and increasing cleaning and maintenance difficulties over time.

[0004] Therefore, it is necessary to improve existing oil-water separation devices such as oil separators. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide an oil-water separation device for waste liquid treatment that improves oil-water separation efficiency, enhances separation effect, achieves automatic cleaning, and reduces the maintenance burden on workers.

[0006] To achieve the above-mentioned technical effects, the technical solution of the present invention is: an oil-water separation device for waste liquid treatment, comprising: The grease trap has an open top and includes a horizontal bottom, a settling section, a transition section, and a separation section, all of which are cylindrical and fixedly connected in sequence. The settling section is fixed above the bottom of the tank, and the separation section is located directly above the settling section. The horizontal cross-sectional length and width of the separation section are smaller than the corresponding dimensions of the settling section. The settling section is provided with a drain outlet, and one end of the separation section is provided with an overflow outlet. The drain outlet is connected to a drain valve. The grease trap also includes an oil tank located above the transition section and communicating with the overflow outlet. The bottom of the oil tank is provided with an oil drain outlet, and the oil drain outlet is connected to an oil drain valve. The oil scraping assembly includes an oil scraper and a translation unit disposed on the oil separator. The bottom of the oil scraper is located inside the separation section and is in contact with the inner walls on both sides of the separation section. The horizontal plane where the bottom of the oil scraper is located passes through the overflow port. The translation unit drives the oil scraper to move along the length direction of the separation section so as to push the oil at the top of the waste liquid in the separation section into the oil tank through the overflow port. An aeration assembly, disposed within the settling section, includes an axially vertical main pipe, a branch pipe rotatably connected to the main pipe with its rotation axis horizontal, a flexible hose connecting the main pipe and the branch pipe, and a rotating unit that drives the main pipe to rotate around its own axis. The end of the main pipe away from the branch pipe is used to connect an aerator. The branch pipe is provided with a first aeration port distributed axially and pointing upwards. The branch pipe is connected to a float, which provides the power for the branch pipe to rotate upwards, so that the end of the branch pipe away from the main pipe remains in close proximity to the inner wall of the settling section.

[0007] Preferably, to avoid the end of the branch pipe and the float rubbing against the inner wall of the settling section, the float is rotatably connected to the branch pipe through a ball joint and is disc-shaped, with balls distributed in a ring array on its outer circumferential edge. The balls rotate around their own center on the float and protrude from the outer surface of the float.

[0008] Preferably, in order to drive the main pipe to rotate while avoiding leakage, the rotating unit includes a rotary motor, a turntable, a drive gear, and a driven gear. The rotary motor is driven and connected to the turntable. The turntable is horizontally attached to the bottom of the pool. The drive gear is adjacent to the bottom of the pool and coaxial with the turntable. The turntable and the drive gear are magnetically attracted to each other. The drive gear meshes with the driven gear. The driven gear is fixedly connected to the main pipe coaxially. An aeration inlet 112 is provided on the bottom of the pool. The top of the aeration inlet 112 is connected to the bottom of the main pipe, and the bottom is used to connect to the output end of the aerator.

[0009] Preferably, to facilitate adjustment of the oil discharge height position according to different oil layer heights, the overflow port extends in a direction parallel to the width of the separation section. The oil separator is also connected to an adjustment assembly, which includes a lifting unit and a baffle plate. The baffle plate is attached to the separation section. The lifting unit drives the baffle plate to move vertically between the sealing position and the overflow position. In the sealing position, the baffle plate seals and covers the overflow port. In the overflow position, the top of the baffle plate is located below the inner top of the overflow port.

[0010] Preferably, in order to enable the bottom of the oil scraper to be automatically and flexibly adjusted according to the overflow height, the baffle and the oil scraper move synchronously and with the same lifting amplitude, and at least two overflow stations are provided.

[0011] Preferably, in order to achieve synchronous lifting and lowering movement of the oil scraper and the baffle, the baffle is fixedly connected to a guide rod extending along the length direction of the separation section, and the oil scraper slides on the guide rod along the length direction of the separation section and is slidably connected to the output end of the translation unit in the vertical direction.

[0012] Preferably, in order to facilitate rapid oil-water separation, the separation section is further provided with an oil-collecting component located below the overflow port. The oil-collecting component includes an oil-collecting unit and a swinging unit. The oil-collecting unit includes a hollow oil-collecting shell that is detachably filled with an oleophilic and hydrophobic filler. The top and bottom surfaces of the oil-collecting shell are densely covered with mesh holes. The output end of the swinging unit is detachably connected to the oil-collecting shell to drive the oil-collecting shell to swing with the swing axis horizontal.

[0013] Preferably, to facilitate the rapid discharge of small oil droplets, the oscillating unit includes: A reciprocating rod extends along the length direction parallel to the separating part and slides on the separating part; The power mechanism drives the reciprocating rod to move back and forth. The transmission component, corresponding one-to-one with the oil-collecting unit, includes a meshing oscillating gear and a rack. The length direction of the rack is consistent with the length direction of the reciprocating rod and the rack is fixed on the reciprocating rod. The oscillating gear is detachably connected to the oil-collecting shell.

[0014] Preferably, in order to achieve a convenient and detachable connection between the oil-absorbing shell and the transmission component, the transmission component further includes a transmission frame disposed between the oscillating gear and the oil-absorbing shell. The transmission frame includes an oscillating rod fixedly connected to the oscillating gear along its own axis and a swing arm fixed to the oscillating rod. The oil-absorbing shell includes a shell barrel with an open top and a shell cover covering the shell barrel. The shell barrel, the shell cover, and the swing arm are fixedly connected by bolts.

[0015] Preferably, in order to ensure the safe and reliable operation of the oil-separating component, the swing rod seal penetrates one of the side walls of the separation section, and the power mechanism, the swing gear, the rack and the reciprocating rod are all located outside the oil separator.

[0016] In summary, compared with the prior art, the oil-water separation device for waste liquid treatment of the present invention increases the thickness of the oil layer after settling by designing the length and width of the separation section to be smaller than the corresponding dimensions of the settling section, making the oil-water interface more stable and improving the separation effect. Furthermore, while the rotating unit drives the main pipe to rotate, the branch pipes remain close to the inner wall of the settling section, expanding the range of bubble movement and increasing the probability of contact between bubbles and oil droplets, while cleaning the inner wall of the oil separator, improving separation efficiency and reducing the cleaning burden on workers. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 An explosion diagram; Figure 3 yes Figure 1 Cross-sectional structural diagram; Figure 4 This is a cross-sectional structural diagram of the oil separator of the present invention; Figure 5 This is a schematic diagram of the structure of the adjustment component of the present invention; Figure 6 yes Figure 5 An explosion diagram; Figure 7 This is a schematic diagram of the oil scraping component of the present invention; Figure 8 yes Figure 7 An explosion diagram; Figure 9 This is a schematic diagram of the structure of the aeration component of the present invention; Figure 10 yes Figure 9 An explosion diagram; Figure 11 yes Figure 9 An illustration of the explosion from another perspective; Figure 12 This is a schematic diagram of the structure of the oil-polymer component of the present invention; Figure 13 yes Figure 12 An explosion diagram; Figure 14 yes Figure 13 Enlarged view of part A; In the diagram: 1. Oil separator; 11. Bottom of the separator; 111. Tempered glass; 112. Aeration inlet; 12. Settling section; 121. Drain outlet; 122. Drain valve; 13. Transition section; 14. Separation section; 141. Overflow outlet; 142. Observation window; 15. Oil tank; 151. Oil drain outlet; 152. Oil drain valve; 2. Oil scraper assembly; 21. Oil scraper blade; 211. Sleeve hole; 22. Translation unit; 221. Translation motor; 222. Sprocket; 223. Chain; 224. Concentric shaft; 225. Translation bearing; 226. Translation frame; 2261. Sliding port; 3. Aeration assembly; 31. Main pipe; 32. Branch pipe; 321. First aeration port; 322. Notch; 33. Hose; 34. Rotating unit; 341. Rotary motor; 342. Turntable; 343. Drive gear; 344. Driven gear; 345. Magnetic shielding tank; 346. Disk; 34 7. Rotating bearing; 35. Float; 351. Ball bearing; 36. Spherical joint; 361. Rotating ball; 362. Connecting rod; 37. Branch pipe; 371. Second aeration port; 4. Aerator; 5. Adjusting component; 51. Baffle plate; 52. Lifting motor; 53. Screw; 54. Screw sleeve; 55. Guide rod; 56. Sliding block; 57. Sliding frame; 58. Fixed frame; 6. Oil-collecting component; 61. Oil-collecting unit; 611. Oil-collecting... 6111, Shell barrel; 6112, Shell cover; 6113, Bolt; 612, Insert rod; 613, Insert hole; 62, Swing unit; 621, Reciprocating rod; 622, Power mechanism; 6221, Power motor; 6222, Power disc; 6223, Protruding rod; 6224, Reciprocating frame; 623, Swing gear; 624, Rack; 625, Swing rod; 626, Swing arm; 627, Guide sleeve; 628, Swing bearing. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] like Figures 1-14 As shown, the present invention provides an oil-water separation device for waste liquid treatment, comprising: The grease trap 1 has an open top and includes a horizontal bottom 11, a settling section 12, a transition section 13, and a separation section 14, which are all cylindrical and fixedly connected in sequence. The settling section 12 is fixed above the bottom 11, and the separation section 14 is located directly above the settling section 12. The horizontal cross-sectional length and width of the separation section 14 are smaller than the corresponding dimensions of the settling section 12. The settling section 12 is provided with a drain outlet 121, and one end of the separation section 14 is provided with an overflow outlet 141. The drain outlet 121 is connected to a drain valve 122. The grease trap 1 also includes an oil tank 15 located above the transition section 13 and communicating with the overflow outlet 141. The bottom of the oil tank 15 is provided with an oil drain outlet 151, and the oil drain outlet 151 is connected to an oil drain valve 152. The oil scraping assembly 2 includes an oil scraper 21 and a translation unit 22 disposed on the oil separator 1. The bottom of the oil scraper 21 is located inside the separation section 14 and is in contact with the inner walls on both sides of the separation section 14. The horizontal plane where the bottom of the oil scraper 21 is located passes through the overflow port 141. The translation unit 22 drives the oil scraper 21 to move along the length direction of the separation section 14 so as to push the oil at the top of the waste liquid in the separation section 14 into the oil tank 15 through the overflow port 141. The aeration assembly 3, disposed within the settling section 12, includes an axially vertical main pipe 31, a branch pipe 32 rotatably connected to the main pipe 31 and with its rotation axis horizontal, a flexible hose 33 connecting the main pipe 31 and the branch pipe 32, and a rotating unit 34 that drives the main pipe 31 to rotate around its own axis. The end of the main pipe 31 away from the branch pipe 32 is used to connect to an aerator 4. The branch pipe 32 is provided with a first aeration port 321 distributed axially and pointing upwards. The branch pipe 32 is connected to a float 35, which provides the power for the branch pipe 32 to rotate upwards, so that the end of the branch pipe 32 away from the main pipe 31 remains in close proximity to the inner wall of the settling section 12.

[0020] When the device is in use, the oil-water mixed waste liquid to be separated (hereinafter referred to as "waste liquid") is introduced into the oil separator 1. The aerator 4 and aeration components 3 are started. External air is introduced through the aerator 4 and compressed, and then a large amount of compressed air is delivered into the main pipe 31. Then the compressed air in the main pipe 31 enters the branch pipe 32 through the hose 33 and is discharged from the first aeration port 321 in the branch pipe 32. This generates a large number of tiny bubbles at the bottom of the waste liquid. When the tiny bubbles rise, they come into contact with the oil droplets in the waste liquid, causing the oil droplets to rise to the top and collect, thus forming an oil layer in the separation section 14 at the top of the oil separator 1.

[0021] While the aerator 4 is operating, in the aeration assembly 3, the rotating unit 34 drives the main pipe 31 to rotate around its own axis, causing the branch pipe 32 to revolve around the axis of the main pipe 31. This changes the position of the branch pipe 32, expanding the range of motion of the microbubbles discharged from the first aeration port 321 (in this invention, the first aeration port 321 is axially arranged on the side wall of the branch pipe 32), thereby increasing the probability of contact between the bubbles and oil droplets, promoting the separation of the oil layer and the water layer, and improving the separation efficiency. Furthermore, the branch pipe 32 also... A float 35 is connected to the oil separator, which provides the power for the branch pipe 32 to rotate upward. This ensures that the end of the branch pipe 32 away from the main pipe 31 is always close to the side wall of the settling section 12. Thus, when bubbles emerge from the first aeration port 321, the bubbles are affected by centrifugal force and buoyancy, and can float upward against the circumferential inner wall of the oil separator 1. This helps to carry the oil droplets attached to the inner wall of the oil separator 1, preventing the oil droplets from accumulating on the tank wall and forming sludge that affects the subsequent oil-water separation. This reduces the burden of regular cleaning and maintenance of the oil separator 1 for workers.

[0022] Furthermore, in this oil-water separation device, the horizontal cross-sectional length and width of the separation section 14 are smaller than the corresponding dimensions of the settling section 12. Specifically, the separation section 14 and the settling section 12 have the same length and width, and the same wall thickness. The settling section 12 is connected to the separation section 14 through a transition section 13, which has a frustum-shaped structure. Thus, after the waste liquid enters the oil separator 1, the oil layer floats to the separation section 14 through the operation of the aerator 4 and the aeration assembly 3. The interface between the oil layer and the water layer is located within the separation section 14. Since the water surface cross-sectional dimension of the separation section 14 is smaller than the horizontal cross-sectional dimension of the settling section 12, the oil layer thickness in the separation section 14 is greater under the same amount of oil. This makes the interface between the oil layer and the water layer more stable, and the interface will not fluctuate violently when the scraper 21 moves, thus preventing the scraper 21 from catching water from the lower layer.

[0023] Compared to existing oil separators, which mostly employ a cuboid structure with identical top and bottom dimensions, when the oil content in wastewater is low, the oil layer floating to the top of the wastewater is typically thin, ranging from 1-3 cm in thickness. This makes the oil-water interface highly sensitive. When the scraper 21 moves, it inevitably causes significant fluctuations in the oil layer interface. Since the height of the scraper 21 is fixed, its action on the fluctuating oil-water interface of the wastewater results in the scraped fluid containing some water, leading to poor oil-water separation. In this invention, by making the cross-sectional dimension of the separation section 14 smaller than that of the settling section 12, the oil layer thickness is increased, resulting in a deeper, more stable, and clearer oil-water interface. When the scraper 21 moves, it only needs to scrape the uppermost oil layer, avoiding the risk of scraping the lower water layer after the interface fluctuates. This further improves the oil-water separation effect.

[0024] In this invention, the specific structure of the oil separator 1 is as follows: Figure 3 and Figure 4 As shown, in the oil separator 1, the bottom 11 of the tank is rectangular, and it is in the same length direction and width direction as the settling part 12 and the separation part 14. The drain outlet 121 is located at the bottom of one end of the settling part 12 and is connected to the drain valve 122. After the oil scraping assembly 2 scrapes off the oil layer on the surface of the waste liquid, the drain valve 122 is opened to discharge the wastewater through the drain outlet 121.

[0025] An overflow port 141 is provided at one end of the separation section 14, and an oil tank 15 with its top flush with the separation section 14 is fixed above the transition section 13 for receiving the oil flowing out from the oil drain port 151. An oil drain port 151 is fixed at the bottom of the oil tank 15, and an oil drain valve 152 is connected to the oil drain port 151. After the oil is completely discharged from the separation section 14, the oil drain valve 152 is opened to discharge the oil received in the oil tank 15 to the outside.

[0026] A further improvement is that the float 35 is rotatably connected to the branch pipe 32 via a ball joint 36 and is disc-shaped. Balls 351 are distributed in a ring array on the outer circumferential edge. The balls 351 rotate around their own center on the float 35 and protrude from the outer surface of the float 35.

[0027] By setting a spherical joint 36, the disc-shaped float 35 can always keep its axis aligned with the vertical direction when supporting the end of the branch pipe 32. The outer circumferential edge of the float 35 is provided with a ball 351. The ball 351 rotates around its own center on the surface of the float 35 and abuts against the inner wall of the settling part 12, thereby avoiding contact and scraping between the float 35 and the end of the branch pipe 32 and the inner wall of the settling part 12. The ball 351, which can rotate around its own center, facilitates relative movement between the float 35 and the inner wall of the settling part 12, reducing friction.

[0028] like Figure 3 , Figure 9 and Figure 11 As shown, the bottom end of the branch pipe 32 is provided with a notch 322. The inner wall of the notch 322 is a spherical surface. The ball joint 36 includes a rotating ball 361 that is in close contact with the inner wall of the notch 322 and a connecting rod 362 fixed between the rotating ball 361 and the float 35. The center of the rotating ball 361 is located inside the notch 322. Thus, the float 35 is a disc-shaped float. This ensures the gap between the end of the branch pipe 32 and the settling part 12, avoids friction, and ensures that the float 35 is in a horizontal state in the waste liquid.

[0029] A further improvement is that the rotating unit 34 includes a rotating motor 341, a turntable 342, a drive gear 343, and a driven gear 344. The rotating motor 341 is driven and connected to the turntable 342. The turntable 342 is horizontally attached to the bottom of the pool 11 below. The drive gear 343 is close to the bottom of the pool 11 above and is coaxial with the turntable 342. The turntable 342 and the drive gear 343 are magnetically attracted to each other. The drive gear 343 meshes with the driven gear 344. The driven gear 344 is fixedly connected to the main pipe 31 coaxially. An aeration inlet 112 is provided on the bottom of the pool 11. The top of the aeration inlet 112 is connected to the bottom of the main pipe 31, and the bottom is used to connect to the output end of the aerator 4.

[0030] With the above design, it is avoided to make a hole in the settling part 12 between the output end of the rotary motor 341 and the drive gear 343, thereby effectively preventing water leakage at the bottom of the waste liquid due to excessive pressure. When the rotary motor 341 runs, it drives the turntable 342 to rotate, causing the drive gear 343, which is magnetically attracted to the turntable 342, to rotate, thereby acting on the driven gear 344, causing the driven gear 344 to drive the main pipe 31 to rotate around its own axis.

[0031] Specifically, such as Figure 3 , Figure 4 , Figures 8-11As shown, the aeration inlet 112 is located at the center of the bottom 11 of the pool. An installation port is also provided on the bottom 11, and tempered glass 111 is fixed inside the installation port. The thickness and roughness of the tempered glass 111 are less than the thickness of the bottom 11. A rotary motor 341 is located directly below the tempered glass 111. The rotary motor 341 is fixed upwards, and its output end is coaxially connected to a magnetic shielding barrel 345. A horizontal turntable 342 is fixed inside the magnetic shielding barrel 345. The magnetic shielding barrel 345 is preferably made of low-carbon steel. Both the magnetic shielding barrel 345 and the turntable 342 are attached to the underside of the tempered glass 111. The driving gear 343 and the driven gear 344 are respectively mounted on the bottom of the pool via two rotating bearings 347. Above part 11, two rotating bearings 347 are coaxially aligned with the aeration inlet 112 and the tempered glass 111, respectively. The outer rings of both bearings are fixed above the bottom of the pool 11, and the inner rings are fixedly connected to the drive gear 343 and the driven gear 344, respectively. A disk 346 is fixedly connected coaxially below the drive gear 343. The disk 346 is attached to the top surface of the tempered glass 111. The disk 346 is a permanent magnet, and the turntable 342 is an electromagnet. When energized, it generates magnetism, so that the turntable 342 and the disk 346 magnetically attract each other. The magnetic shielding barrel 345 is used to prevent the magnetic field from interfering with the operation of the rotating motor 341, and can also physically fix the output end of the rotating motor 341 to the turntable 342. Thus, when the rotary motor 341 is started, it can drive the turntable 342 to rotate, attracting the disk 346 attached to the top to rotate synchronously, driving the drive gear 343 to rotate stably under the support and guidance of the rotary bearing 347, and then driving the driven gear 344 and the branch pipe 32 to rotate.

[0032] Driven gear 344 is a ring gear with a through hole in its center. Main pipe 31 is fixed directly above driven gear 344 and its bottom end is connected to the through hole. The through hole is coaxial with aeration inlet 112. Aeration inlet 112 is used to fix the output end of aerator 4. In this way, the external air introduced by aerator 4 can enter the main pipe 31 through aeration inlet 112 and through hole in sequence.

[0033] The lower part of the main pipe 31 is also fixedly connected to a horizontal branch pipe 37. The projection of the branch pipe 37 on the horizontal plane is perpendicular to the projection of the branch pipe 32 on the horizontal plane, forming a cross shape. The branch pipe 37 is provided with a second aeration port 371 that is upward and distributed along its axial direction. In this way, the compressed air output by the aerator 4 is divided into two paths after passing through the driven gear 344. One path enters the branch pipe 37 and is sprayed out from the second aeration port 371. The other path enters the branch pipe 32 through the hose 33 and is sprayed out from the first aeration port 321. This further expands the activity range of the bubbles, increases the probability of contact between the bubbles and the tiny oil droplets, so as to drive the oil droplets to float and gather, quickly form an oil layer, and improve the oil-water separation efficiency.

[0034] A further improvement is that the overflow port 141 extends in a width direction parallel to the separation section 14, and the oil separator 1 is also connected to an adjustment assembly 5. The adjustment assembly 5 includes a lifting unit and a baffle plate 51. The baffle plate 51 is attached to the separation section 14. The lifting unit drives the baffle plate 51 to move in a vertical direction between the sealing position and the overflow position. In the sealing position, the baffle plate 51 seals and covers the overflow port 141. In the overflow position, the top of the baffle plate 51 is located below the inner top of the overflow port 141.

[0035] In this invention, the overflow port 141 is rectangular, with its width in the vertical direction. The baffle plate 51 is driven to move in the vertical direction by the lifting unit, switching between the sealing position and the overflow position. In the sealing position, the overflow port 141 is sealed and covered to prevent liquid from flowing into the oil tank 15 from the overflow port 141. This is usually used before the waste liquid is completely separated into oil and water. After the waste liquid is clearly separated into oil and water, the baffle plate 51 is controlled to move downward by the lifting unit, which works in conjunction with the oil scraping assembly 2. This causes the oil scraping plate 41 to move from the end away from the overflow port 141 to the overflow port 141, pushing the oil in the waste liquid from the overflow port 141 into the oil tank 15, thus completing the oil-water separation operation.

[0036] A further improvement is that the baffle plate 51 and the oil scraper plate 21 move up and down synchronously with the same amplitude, and there are at least two overflow stations.

[0037] This design enables the baffle plate 51 and the oil scraper 21 to move up and down synchronously. While the lifting unit controls the height of the baffle plate 51 according to the height position of the oil-water interface, it can also control the bottom height position of the oil scraper 21 at the same time, ensuring that the bottom of the oil scraper 21 is at the oil-water interface. This allows the translation unit 22 to push the oil layer on top of the waste liquid into the oil tank 15 through the oil scraper 21 when it is running.

[0038] To enable the translation unit 22 to drive the oil scraper 21 to move horizontally, and simultaneously coordinate with the lifting unit to drive the baffle plate 51 and the oil scraper 21 to move up and down synchronously, the oil scraper assembly 2 and the adjusting assembly 5 in this invention are structured as follows: Figures 5-8 As shown.

[0039] Specifically, the end of the separator 14 adjacent to the oil tank 15 is provided with guide grooves that face each other and extend vertically to both sides of the overflow port 141. The two sides of the baffle plate 51 are slidably engaged with the guide grooves on both sides to limit the stable vertical movement of the baffle plate 51 during the operation of the lifting unit. The other end of the separator 14 is provided with an observation window 142 to facilitate observation of the oil-water separation interface, so as to control the operation of the lifting unit and move the oil scraper 21 and the baffle plate 51 to a suitable height position.

[0040] The lifting unit includes a fixed frame 58, a lifting motor 52, a screw 53, and a screw sleeve 54. The fixed frame 58 is a U-shaped frame fixed downwards to the oil tank 15. The lifting motor 52 is fixed below the fixed frame 58, and its output end passes through the fixed frame 58 and is coaxially connected to the screw 53. The screw 53 is threadedly connected to the screw sleeve 54, and the screw sleeve 54 is fixedly connected to the baffle plate 51. Thus, the lifting motor 52 drives the screw 53 to rotate around its own axis, acting on the screw sleeve 54, thereby driving the baffle plate 51 to move up and down along the guide groove.

[0041] Above the baffle 51, two guide rods 55 are fixedly connected, located above the separation section 14, distributed along the width direction of the separation section 14, and extending along the length direction of the separation section 14. A slider 56 is fixed to one end of the guide rod 55 away from the baffle 51. The adjustment assembly 5 also includes a sliding frame 57 fixed above the separation section 14, and the slider 56 slides on the sliding frame 57 in the vertical direction.

[0042] In the oil scraping assembly 2, the top of the oil scraper 21 is provided with sleeve holes 211 that correspond one-to-one with the guide rod 55. The circumferential inner wall of the sleeve hole 211 is sealed and fitted with the circumferential outer edge of the guide rod 55. In this way, when the baffle plate 51 moves up and down, the oil scraper 21 can be raised and lowered synchronously through the cooperation of the guide rod 55 and the sleeve hole 211. At the same time, it is convenient for the translation unit 22 to drive the oil scraper 21 to move horizontally along the guide rod 55.

[0043] The translation unit 22 includes a translation motor 221 and two transmission units distributed along the width direction of the separation section 14. Each transmission unit includes a chain 223 and two sprockets 222. The chain 223 is oval-shaped, and the two sprockets 222 are connected via the chain 223. The two sprockets 222 are located at opposite ends of the separation section 14. The translation motor 221 is fixed to one side of the separation section 14, and its output end is fixedly connected to one of the sprockets 222 along the same axis. Of the two transmission units, the one located on the same side of the separation section 14... The sprocket 222 at the end position is fixedly connected to the coaxial center line of the concentric shaft 224. A translation bearing 225 is provided on the concentric shaft 224. The inner ring of the translation bearing 225 is fixedly connected to the concentric shaft 224, and the outer ring is fixed above the separation part 14. A translation frame 226 is fixedly connected between the two chains 223. The translation frame 226 is arranged vertically. The top of the oil scraper 21 slides on the inner side of the translation frame 226. The two sides of the translation frame 226 are provided with sliding openings 2261 that extend in the vertical direction for the guide rod 55 to pass through.

[0044] With the above structure, when the translation motor 221 is started, it drives the sprocket 222 at the same end to rotate under the cooperation of the translation bearing 225 and the concentric shaft 224, so that the sprocket 222 at the other end rotates synchronously, thereby driving the chain 223 to rotate around its own circumference, so that the translation frame 226 moves horizontally, thereby providing power for the horizontal movement of the oil scraper 21.

[0045] A further improvement is that the separation section 14 is also provided with an oil-collecting component 6 located below the overflow port 141. The oil-collecting component 6 includes an oil-collecting unit 61 and a swinging unit 62. The oil-collecting unit 61 includes a hollow oil-collecting shell 611 that is detachably filled with an oleophilic and hydrophobic filler. The top and bottom surfaces of the oil-collecting shell 611 are densely covered with mesh holes. The output end of the swinging unit 62 is detachably connected to the oil-collecting shell 611 to drive the oil-collecting shell 611 to swing with the swing axis horizontal.

[0046] In this invention, the hydrophilic-lipophilic packing material is preferably a hydrophilic oil-transporting polyurethane foam packing material or a porous PP oil-polymer packing material. With the above design, in conjunction with the aeration component 3, oil droplets are carried by air bubbles to the oil-polymerization component 6. Utilizing the properties of the hydrophilic-lipophilic packing material within the oil-polymerization shell 611, small oil droplets are aggregated, forming larger droplets and increasing the buoyancy of the droplets. When the oil droplets grow to a certain size, they detach from the oil-polymerization shell 611 and float to the surface, forming an oil layer. After oil-water separation has been underway for a period of time, the oscillating unit 62 is activated, causing the oil-polymerization shell 611 to oscillate reciprocally. This provides some of the small oil droplets attached to the hydrophilic-lipophilic packing material with propulsion, promoting their upward movement and allowing them to converge in the upper oil layer, forming an oil layer with increased thickness. After repeated use, the hydrophilic-lipophilic packing material within the oil-polymerization shell 611 can be cleaned, replaced, or otherwise maintained to ensure the operational stability of the oil-polymerization component 6 and extend its service life.

[0047] like Figures 1-3 , Figures 12-14 As shown, in this invention, the oil-gathering unit 61 is provided in two layers, with a total of five units. There are three oil-gathering units 61 in the upper layer and two oil-gathering units 61 in the lower layer, which are distributed in an alternating manner. There are gaps between the oil-gathering units 61 and between the oil-gathering units 61 and the inner wall of the separation part 14 for the waste liquid to pass through, and the waste liquid enters the settling part 12.

[0048] A further improvement is that the swing unit 62 includes: The reciprocating rod 621 extends along the length direction parallel to the separation part 14 and slides on the separation part 14; The power mechanism 622 drives the reciprocating rod 621 to move back and forth. The transmission components, corresponding one-to-one with the oil-collecting unit 61, include a oscillating gear 623 and a rack 624 that mesh with each other. The length direction of the rack 624 is consistent with the length direction of the reciprocating rod 621 and the rack 624 is fixed on the reciprocating rod 621. The oscillating gear 623 is detachably connected to the oil-collecting shell 611.

[0049] When the swing unit 62 is running, the power mechanism 622 drives the reciprocating rod 621 to move back and forth along its length, which in turn drives the rack 624 to move back and forth, which in turn acts on the swing gear 623, causing the swing gear 623 to rotate back and forth. This causes the oil-collecting shell 611, which is detachably connected to the swing gear 623, to swing back and forth, thus removing some of the attached small oil droplets.

[0050] A further improvement is that the transmission component also includes a transmission frame disposed between the oscillating gear 623 and the oil-filled shell 611. The transmission frame includes an oscillating rod 625 which is fixedly connected to the oscillating gear 623 along its own axis and rotates around its own axis, and a swing arm 626 fixed on the oscillating rod 625. The oil-filled shell 611 includes a shell barrel 6111 with an open top and a shell cover 6112 covering the shell barrel 6111. The shell barrel 6111, the shell cover 6112 and the swing arm 626 are fixedly connected by bolts 6113.

[0051] The above design facilitates the detachable connection between the oscillating gear 623 and the oil-coated shell 611, and also facilitates the cleaning, replacement, and other maintenance work of the oleophilic and hydrophobic filler inside the oil-coated shell 611.

[0052] A further improvement is that the swing rod 625 is sealed through one of the side walls of the separation section 14, and the power mechanism 622, swing gear 623, rack 624 and reciprocating rod 621 are all located outside the oil separator 1.

[0053] Since the liquid in the separation section 14 is at a high level of the waste liquid, the liquid pressure is relatively low. By using the swing rod 625 to seal through the side wall of the separation section 14, it can be ensured that after the power mechanism 622, the swing gear 623, the rack 624 and the reciprocating rod 621 work together, they can drive the oil-coated shell 611 to swing, so as to throw out the small oil droplets attached to the oleophilic and hydrophobic filler in the oil-coated shell 611.

[0054] The power mechanism 622 includes a power motor 6221 fixed to one end of the separation part 14. A power disk 6222 is fixed to the output end of the power motor 6221 along the coaxial centerline. The centerline of the power disk 6222 is parallel to the width direction of the separation part 14. A protruding rod 6223 is fixed to the end of the power disk 6222 facing away from the power motor 6221. A reciprocating frame 6224 is provided outside the protruding rod 6223 and is fixedly connected to the reciprocating rod 621. The reciprocating frame 6224 is vertically arranged and its inner walls on both sides are in contact with the protruding rod 6223. A guide sleeve 627 is fixed on the outer wall of the separation part 14. The reciprocating rod 621 slides through the inner side of the guide sleeve 627 and is fixedly inserted through each rack 624.

[0055] With the above structure, the power motor 6221 starts and drives the power disk 6222 to rotate, causing the convex rod 6223 to move circumferentially and act on the inner wall of the reciprocating frame 6224. Through the guiding action of the guide sleeve 627, the reciprocating rod 621 moves back and forth along its own length direction, thereby driving the rack 624, which is fixedly passed through it, to move back and forth along the length direction of the separation part 14, acting on the swing gear 623, causing the swing gear 623 to rotate back and forth.

[0056] The swing rod 625 is fixedly connected to the corresponding swing gear 623 along the same axis. The swing rod 625 is sealed through the side wall of one side of the separation part 14, and the swing rod 625 is fitted with a swing bearing 628. The inner ring of the swing bearing 628 is fixedly connected to the swing rod 625, and the outer ring is fixed to the outer side wall of the separation part 14. The swing bearing 628 is used to limit the swing gear 623 to rotate back and forth around its own axis.

[0057] The swing arm 626 is located inside the separation section 14 and is fixedly connected to the swing rod 625. The oil-absorbing shell 611 is flat and includes a shell barrel 6111 with an open top and a shell cover 6112 covering the shell barrel 6111. Insert rods 612 are fixed at the lower corners of the four corners of the shell cover 6112. Insert holes 613 are provided at the four corners of the shell barrel 6111 to engage with the insert rods 612, so as to achieve a precise connection between the shell cover 6112 and the shell barrel 6111. The shell cover 6112, the shell barrel 6111 and the swing arm 626 are fixedly connected by bolts 6113, which facilitates the disassembly of the oil-absorbing shell 611 and the cleaning and replacement of the oleophilic and hydrophobic filler inside the oil-absorbing shell 611.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An oil-water separation device for waste liquid treatment, characterized in that, include: The grease trap has an open top and includes a horizontal bottom, a settling section, a transition section, and a separation section, all of which are cylindrical and fixedly connected in sequence. The settling section is fixed above the bottom of the tank, and the separation section is located directly above the settling section. The horizontal cross-sectional length and width of the separation section are smaller than the corresponding dimensions of the settling section. The settling section is provided with a drain outlet, and one end of the separation section is provided with an overflow outlet. The drain outlet is connected to a drain valve. The grease trap also includes an oil tank located above the transition section and communicating with the overflow outlet. The bottom of the oil tank is provided with an oil drain outlet, and the oil drain outlet is connected to an oil drain valve. The oil scraping assembly includes an oil scraper and a translation unit disposed on the oil separator. The bottom of the oil scraper is located inside the separation section and is in contact with the inner walls on both sides of the separation section. The horizontal plane where the bottom of the oil scraper is located passes through the overflow port. The translation unit drives the oil scraper to move along the length direction of the separation section so as to push the oil at the top of the waste liquid in the separation section into the oil tank through the overflow port. An aeration assembly, disposed within the settling section, includes an axially vertical main pipe, a branch pipe rotatably connected to the main pipe with its rotation axis horizontal, a flexible hose connecting the main pipe and the branch pipe, and a rotating unit that drives the main pipe to rotate around its own axis. The end of the main pipe away from the branch pipe is used to connect an aerator. The branch pipe is provided with a first aeration port distributed axially and pointing upwards. The branch pipe is connected to a float, which provides the power for the branch pipe to rotate upwards, so that the end of the branch pipe away from the main pipe remains in close proximity to the inner wall of the settling section.

2. The oil-water separation device for waste liquid treatment according to claim 1, characterized in that: The float is rotatably connected to the branch pipe via a ball joint and is disc-shaped. Balls are distributed in a ring array around its outer circumferential edge. The balls rotate around their own center on the float and protrude from the outer surface of the float.

3. The oil-water separation device for waste liquid treatment according to claim 1, characterized in that: The rotating unit includes a rotary motor, a turntable, a drive gear, and a driven gear. The rotary motor is driven and connected to the turntable. The turntable is horizontally attached to the bottom of the pool. The drive gear is adjacent to the bottom of the pool and coaxial with the turntable. The turntable and the drive gear are magnetically attracted to each other. The drive gear meshes with the driven gear. The driven gear is fixedly connected to the main pipe coaxially. An aeration inlet 112 is provided on the bottom of the pool. The top of the aeration inlet 112 is connected to the bottom of the main pipe, and the bottom is used to connect to the output end of the aerator.

4. The oil-water separation device for waste liquid treatment according to claim 1, characterized in that: The overflow port extends in a direction parallel to the width of the separation section. The oil separator is also connected to an adjustment assembly, which includes a lifting unit and a baffle plate. The baffle plate is attached to the separation section. The lifting unit drives the baffle plate to move vertically between a sealing position and an overflow position. In the sealing position, the baffle plate seals and covers the overflow port. In the overflow position, the top of the baffle plate is located below the inner top of the overflow port.

5. The oil-water separation device for waste liquid treatment according to claim 4, characterized in that: The baffle and the oil scraper move up and down synchronously with the same amplitude, and at least two overflow stations are provided.

6. The oil-water separation device for waste liquid treatment according to claim 5, characterized in that: The baffle plate is fixedly connected to a guide rod extending along the length direction of the separation section, and the oil scraper slides on the guide rod along the length direction of the separation section and is slidably connected to the output end of the translation unit in the vertical direction.

7. The oil-water separation device for waste liquid treatment according to any one of claims 1-6, characterized in that: The separation section is also provided with an oil-collecting component located below the overflow port. The oil-collecting component includes an oil-collecting unit and a swinging unit. The oil-collecting unit includes a hollow oil-collecting shell that is detachably filled with an oleophilic and hydrophobic filler. The top and bottom surfaces of the oil-collecting shell are densely covered with mesh holes. The output end of the swinging unit is detachably connected to the oil-collecting shell to drive the oil-collecting shell to swing with the swing axis being horizontal.

8. The oil-water separation device for waste liquid treatment according to claim 7, characterized in that: The swing unit includes: A reciprocating rod extends along the length direction parallel to the separating part and slides on the separating part; The power mechanism drives the reciprocating rod to move back and forth. The transmission component, corresponding one-to-one with the oil-collecting unit, includes a meshing oscillating gear and a rack. The length direction of the rack is consistent with the length direction of the reciprocating rod and the rack is fixed on the reciprocating rod. The oscillating gear is detachably connected to the oil-collecting shell.

9. The oil-water separation device for waste liquid treatment according to claim 8, characterized in that: The transmission component further includes a transmission frame disposed between the oscillating gear and the oil-collecting shell. The transmission frame includes an oscillating rod fixedly connected to the oscillating gear along its own axis and a swing arm fixed to the oscillating rod. The oil-collecting shell includes a shell barrel with an open top and a shell cover covering the shell barrel. The shell barrel, the shell cover, and the swing arm are fixedly connected by bolts.

10. The oil-water separation device for waste liquid treatment according to claim 9, characterized in that: The swing rod seal penetrates one of the side walls of the separation section, and the power mechanism, the swing gear, the rack and the reciprocating rod are all located outside the oil separator.

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