An oil-water separation device for treating oily wastewater

Abstract

The utility model relates to machining technical field especially relates to an oil -water separation device of oily wastewater treatment, including pretreatment mechanism, the pretreatment mechanism is connected with oil -water separation mechanism through second water inlet pipe, oil outlet pipe is equipped with in the oil -water separation mechanism upper end, and the lower extreme is equipped with the water outlet pipe, it includes outer cylinder and inner cylinder, the inner cylinder top is the open end, and the bottom is fixedly connected with outer cylinder, second water inlet pipe penetrates the outer cylinder side wall, and is connected with the inside of inner cylinder, the water outlet pipe and oil outlet pipe are connected with outer cylinder, the inner cylinder bottom is equipped with the dissolved gas shower nozzle, the dissolved gas shower nozzle is connected with micro -bubble generating mechanism, and oil -water mixture is separated through the dissolved gas bubble, and the bubble drives oil liquid to float, and oil phase flows into the oil storage bucket through the oil outlet pipe, and water phase returns to the water storage pool through the water outlet pipe, and the water after oil -water separation can be used for cooling the roll of grinding machine again, and the oil liquid in the oil storage bucket can also be recycled after the sedimentation separation, and it is favorable for the cost reduction and benefit increase of enterprise.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing technology, and in particular to an oil-water separation device for treating oily wastewater. Background Technology

[0002] During the grinding process of the front and rear sections of the rolls, the surface of the rolls is cooled by cooling water, and the roll shoulders are lubricated by lubricating oil. After the oil and water are mixed, they flow into the water storage tank through the open return water tank of the machine bed. This results in rapid pollution of the cooling water in the water storage tank, short replacement cycle, oil waste, and high labor intensity for personnel.

[0003] Utility model patent CN213265832U discloses a lubricating oil-water separation device for steelmaking plants, including a water injection mechanism, an outer shell, a separation mechanism, and a water outlet mechanism. The water injection mechanism is fixedly installed above the outer shell, and a receiving cavity is opened inside the outer shell. The separation mechanism is fixedly installed inside the receiving cavity, and the water outlet mechanism is fixedly installed at the lower end of the outer shell. By adding a coagulant into the receiving cavity, the grease in the oil-water mixture is coagulated, causing the grease to coagulate into a colloid and float to the surface. The remaining oil-water mixture enters the separation mechanism, where a drive motor drives the first gear, the second gear, and the collection tank to rotate. Centrifugal force is used to further separate the oil-water mixture. Although the above device achieves oil-water separation of lubricating oil, because a coagulant is added to the oil-water mixture, the separated grease cannot be directly reused, and the collected grease needs to be removed by opening the cover or collected through the water outlet pipe. Therefore, the above-mentioned oil-water separation device cannot continuously process oil-water mixtures. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model provides an oil-water separation device that can continuously treat oily wastewater, and the separated oil can be reused after filtration and sedimentation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An oil-water separation device for treating oily wastewater includes a pretreatment mechanism connected to a water storage tank. The pretreatment mechanism is connected to an oil-water separation mechanism via a second water inlet pipe. The upper end of the oil-water separation mechanism is connected to an oil storage tank via an oil outlet pipe, and the lower end is provided with a water outlet pipe. The oil-water separation mechanism includes an outer cylinder and an inner cylinder. The top of the inner cylinder is open, and the bottom is fixedly connected to the outer cylinder. The second water inlet pipe penetrates the side wall of the outer cylinder and is connected to the interior of the inner cylinder. The water outlet pipe and the oil outlet pipe are connected to the outer cylinder. A dissolved air nozzle is provided at the bottom of the inner cylinder. The dissolved air nozzle is connected to a microbubble generating mechanism to separate the oil-water mixture through dissolved air bubbles. A first exhaust valve is provided at the top of the outer cylinder, and an oil discharge solenoid valve is provided on the oil outlet pipe.

[0007] The aforementioned oil-water separation device for treating oily wastewater includes a first exhaust valve comprising a first housing, a first cover, a second cover, a vent plate, a float, and a sealing plug. The bottom of the first housing is connected to the top of the outer cylinder via a first exhaust pipe, and the top of the first housing is provided with a first cover. The first cover has a through hole in the middle, and the second cover is located above the first cover. The vent plate surrounds the outside of the vent hole and is located between the first cover and the second cover. The vent plate has a vent hole. A float is provided inside the first housing, and a sealing plug is connected to the top of the float. A top rod is provided on the upper part of the sealing plug, and the top rod passes through the through hole and extends toward the second cover. A pressure sensor is provided at the bottom of the second cover.

[0008] In the aforementioned oil-water separation device for treating oily wastewater, the bottom of the first cover is fixedly connected to a fixing ring. A first connecting rod is provided on one side of the fixing ring, and a second connecting rod is hinged to the other end of the first connecting rod. The other end of the second connecting rod is hinged to a float. A connecting block is provided in the middle of the second connecting rod, and the connecting block is located at the end near the float. A connecting rod is provided at the bottom of the sealing plug, and the connecting rod is hinged to the connecting block. Sliding rods are provided on both sides of the sealing plug. Guide members are provided on both sides of the fixing ring, and guide grooves are provided on the guide members. The sliding rods are located in the guide grooves and move up and down along the guide grooves.

[0009] The aforementioned oil-water separation device for treating oily wastewater also includes a second exhaust valve at the top of the outer cylinder. The second exhaust valve is installed higher than the first exhaust valve. The second exhaust valve includes a second housing, an exhaust branch pipe, a sealing plate, and a return spring. The bottom of the second exhaust valve is connected to the top of the outer cylinder through a second exhaust pipe. An exhaust branch pipe is provided on its side wall. The sealing plate is located below the opening of the exhaust branch pipe, and its outer diameter is consistent with the inner diameter of the second housing. A guide sleeve is provided at the top, and a guide rod is slidably provided inside the guide sleeve. The guide rod is connected to the top wall of the second housing, and a return spring is provided outside the guide sleeve and the guide rod.

[0010] The oil-water separation device for treating oily wastewater described above includes a microbubble generating mechanism comprising a dissolved air nozzle, an air compressor, a dissolved air tank, a pressurizing pump, and a water storage tank. A return water branch pipe is provided on the outlet pipe, connecting to the water storage tank. Water from the water storage tank flows into the dissolved air tank via the pressurizing pump. The air outlet of the air compressor is connected to the dissolved air tank, dissolving air in the water through the dissolved air tank. An air supply pipe is connected to the side wall of the dissolved air tank, passing through the bottom of the outer cylinder and connecting to the dissolved air nozzle. The dissolved air nozzle is fixed to the center of the bottom of the inner cylinder.

[0011] In the above-mentioned oil-water separation device for treating oily wastewater, the top of the inner cylinder is provided with a baffle, which extends outward from the top of the inner cylinder to the outer cylinder.

[0012] In the above-mentioned oil-water separation device for treating oily wastewater, the top of the pretreatment mechanism is open, and a support ring and a filter screen are provided inside. The filter screen is attached to the upper end of the support ring, and handles are provided on both sides of the filter screen. The oil-water mixture in the water storage tank enters from the top of the pretreatment mechanism through the first water inlet pipe and flows out along the second water inlet pipe at the bottom.

[0013] In the above-mentioned oil-water separation device for treating oily wastewater, a one-way valve is provided on the second inlet pipe, and a shut-off valve is provided on both the first inlet pipe and the outlet pipe.

[0014] The oil-water separation device for treating oily wastewater described above also includes a vent pipe on the top of the oil storage tank.

[0015] The oil-water separation device for treating oily wastewater described above has a heater installed at the top of the outer cylinder.

[0016] The beneficial effects of adopting the above technical solution are as follows:

[0017] This invention filters oily wastewater through a pretreatment mechanism. First, solid impurities are removed from the wastewater. Then, the wastewater is introduced into the inner cylinder of an oil-water separation mechanism. The bottom of the inner cylinder is equipped with a dissolved air nozzle. Dissolved air bubbles are used to separate the oil-water mixture. The bubbles carry the oil to the surface. The oil phase flows into the oil storage tank through the oil outlet pipe, while the water phase flows back to the water storage tank through the water outlet pipe. The water after oil-water separation can be reused to cool the grinding machine rolls, extending the service life of the cooling water. The oil in the oil storage tank can also be reused after sedimentation and separation, increasing the effective utilization rate of oil, avoiding oil waste, and helping enterprises reduce costs and increase efficiency.

[0018] Furthermore, the outer cylinder of this invention is equipped with a first exhaust valve at its top, through which gas can be discharged. When the oil level in the outer cylinder rises, the oil enters the first housing of the first exhaust valve and drives the float to rise. The rising float then drives the top rod to press against the pressure sensor, causing the control system to activate the oil discharge solenoid valve to start discharging oil. During the oil discharge process, the oil-water separation mechanism does not need to stop, and can continuously process oily wastewater, ensuring a continuous supply of cooling water for the rolls and improving production efficiency. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model (not drawn to scale);

[0021] Figure 2 This is a cross-sectional view of the oil-water separation mechanism in this utility model (not drawn to scale);

[0022] Figure 3This is a cross-sectional view of the pretreatment mechanism in this utility model (not drawn to scale);

[0023] Figure 4 This is a cross-sectional view of the first exhaust valve in this utility model (not drawn to scale);

[0024] Figure 5 for Figure 4 Enlarged view of part A in the middle (not drawn to scale);

[0025] Figure 6 This is a cross-sectional view of the second exhaust valve in this utility model (not drawn to scale).

[0026] In the diagram: 1. First inlet pipe; 2. Pretreatment mechanism; 21. Support ring; 22. Filter screen; 3. Second inlet pipe; 31. One-way valve; 4. Oil-water separation mechanism; 41. Outer cylinder; 42. Inner cylinder; 421. Baffle; 43. First exhaust valve; 431. First housing; 432. First cover; 433. Second cover; 4331. Pressure sensor; 434. Vent plate; 435. Float; 436. Sealing plug; 4361. Top rod; 4362. Sliding rod; 437. Fixing ring; 4371. Guide component; 4372. 438. Guide groove; 439. First connecting rod; 44. First exhaust pipe; 45. Second exhaust valve; 451. Second housing; 452. Exhaust branch pipe; 453. Sealing plate; 454. Return spring; 46. Second exhaust pipe; 47. Heater; 5. Oil outlet pipe; 51. Oil discharge solenoid valve; 6. Oil storage tank; 61. Venting pipe; 7. Water outlet pipe; 71. Water return branch pipe; 8. Microbubble generating mechanism; 81. Dissolved gas nozzle; 82. Air compressor; 83. Dissolved gas tank; 84. Pressurization pump; 85. Water storage tank; 86. Gas delivery pipe. Detailed Implementation

[0027] like Figure 1-6As shown, this utility model includes a pretreatment mechanism 2 connected to a water storage tank. The pretreatment mechanism 2 is connected to an oil-water separation mechanism 4 via a second water inlet pipe 3. The upper end of the oil-water separation mechanism 4 is connected to an oil storage tank 6 via an oil outlet pipe 5, and the lower end is connected to a water outlet pipe 7 to return the treated water to the water storage tank. The oil-water separation mechanism 4 includes an outer cylinder 41 and an inner cylinder 42, which are coaxial. The top of the inner cylinder 42 is open, and the bottom is fixedly connected to the outer cylinder 41. The second water inlet pipe 3 penetrates the side wall of the outer cylinder 41 and is connected to the interior of the inner cylinder 42. The water outlet pipe 7 and the oil outlet pipe 5 are connected to... The outer cylinder 41 is connected to the inner cylinder 42, which is equipped with a dissolved air nozzle 81 at the bottom. The dissolved air nozzle 81 is connected to the microbubble generating mechanism 8. The oil-water mixture is separated by dissolved air bubbles. The outer cylinder 41 is equipped with a first exhaust valve 43 at the top. The oil outlet pipe 5 is equipped with an oil discharge solenoid valve 51. When it is necessary to discharge oil, the oil discharge solenoid valve 51 can be opened. The oil located at the upper end of the oil-water separation mechanism 4 enters the oil storage tank 6 along the oil outlet pipe 5 and further settles in the oil storage tank 6. Then the oil is recycled and reused. At the same time, the treated water is returned to the water storage tank, which can extend the replacement cycle of cooling water.

[0028] like Figure 4 , 5 As shown, the first exhaust valve 43 includes a first housing 431, a first cover 432, a second cover 433, a vent plate 434, a float 435, and a sealing plug 436. The bottom of the first housing 431 is connected to the top of the outer cylinder 41 through a first exhaust pipe 44. The top of the first housing 431 is provided with a first cover 432, which has a through hole in the middle. The second cover 433 is located above the first cover 432. The vent plate 434 surrounds the outside of the vent hole and is located between the first cover 432 and the second cover 433. The vent plate 434 has a vent hole. Gas enters the interior of the first housing 431 through the first exhaust pipe 44 and then exits through the through hole and the vent hole. A float 435 is provided inside the first housing 431, and a sealing plug 436 is connected to the top of the float 435. The upper side wall of the plug 436 is inclined to block the through hole of the first cover 432. The plug 436 is provided with a push rod 4361 at the top. The push rod 4361 passes through the through hole and extends to the second cover 433. The bottom of the second cover 433 is provided with a pressure sensor 4331. When the oil enters the first housing 431, the float 435 rises with the oil level and eventually drives the push rod 4361 to press against the pressure sensor 4331. After the control system receives the pressure signal, it activates the oil discharge solenoid valve 51. The oil enters the oil storage tank 6 along the oil outlet pipe 5. The oil level in the outer cylinder 41 drops and the oil in the first housing 431 flows out. The float 435 drives the push rod 4361 to descend. The push rod 4361 no longer presses against the pressure sensor 4331, and the control system then closes the oil discharge solenoid valve 51.

[0029] Furthermore, the bottom of the first cover 432 of this utility model is fixedly connected to the fixing ring 437. A first connecting rod 438 is provided on one side of the fixing ring 437. The other end of the first connecting rod 438 is hinged to a second connecting rod 439. The other end of the second connecting rod 439 is hinged to a float 435. A connecting block is provided in the middle of the second connecting rod 439. The connecting block is located at the end near the float 435. A connecting rod is provided at the bottom of the sealing plug 436. The connecting rod is hinged to the connecting block. Sliding rods 4362 are provided on both sides of the sealing plug 436. Guide members 4371 are provided on both sides of the fixing ring 437. A guide groove 4372 is provided on the guide member 4371. The sliding rod 4362 is located in the guide groove 4372 and moves up and down along the guide groove 4372.

[0030] like Figure 6 As shown, the top of the outer cylinder 41 is also provided with a second exhaust valve 45. The installation position of the second exhaust valve 45 is higher than that of the first exhaust valve 43. The second exhaust valve 45 includes a second housing 451, an exhaust branch pipe 452, a sealing plate 453, and a return spring 454. The bottom of the second exhaust valve 45 is connected to the top of the outer cylinder 41 through a second exhaust pipe 46. Its side wall is provided with an exhaust branch pipe 452. The inner cross-section of the exhaust branch pipe 452 is V-shaped. The sealing plate 453 is located below the opening of the exhaust branch pipe 452, and its outer diameter is consistent with the inner diameter of the second housing 451. The top is provided with a guide. The guide sleeve has a guide rod that slides inside it. The guide rod is connected to the top wall of the second housing 451. The guide sleeve and the guide rod are fitted with a return spring 454. When the first exhaust valve 43 is closed, the gas pressure at the top of the outer cylinder 41 increases, thereby compressing the return spring 454. This causes the sealing plate 453 to gradually rise above the exhaust branch pipe 452. The gas is discharged through the exhaust branch pipe 452 until the oil level drops. The first exhaust valve 43 then opens, the pressure inside the outer cylinder 41 decreases, and the return spring 454 drives the sealing plate 453 to move downward, thereby closing the second exhaust valve 45.

[0031] like Figure 1As shown, the microbubble generating mechanism 8 includes a dissolved air nozzle 81, an air compressor 82, a dissolved air tank 83, a pressurizing pump 84, and a water storage tank 85. A return water branch pipe 71 is provided on the water outlet pipe 7, and the return water branch pipe 71 is connected to the water storage tank 85. The water in the water storage tank 85 flows into the dissolved air tank 83 through the pressurizing pump 84. The air outlet of the air compressor 82 is connected to the dissolved air tank 83, and air is dissolved in water through the dissolved air tank 83. The side wall of the dissolved air tank 83 is connected to an air supply pipe 86. After passing through the bottom of the outer cylinder 41, the air supply pipe 86 is connected to the dissolved air nozzle 81. The dissolved air nozzle 81 is fixed at the center of the bottom of the inner cylinder 42. The dissolved air nozzle 81 depressurizes the dissolved air water, causing the air dissolved in the water to be released rapidly, forming a large number of tiny bubbles. The bubbles are adsorbed on the oil molecules and drive the oil molecules to float, thereby accelerating oil-water separation.

[0032] In addition, the inner cylinder 42 of this utility model is provided with a baffle 421 at the top. The baffle 421 extends from the top periphery of the inner cylinder 42 to the outer cylinder 41. Oil droplets float on the inclined plate surface, and the water phase flows downward.

[0033] like Figure 3 As shown, the top of the pretreatment mechanism 2 is open, and a support ring 21 and a filter screen 22 are provided inside. The filter screen 22 is attached to the end of the support ring 21. The filter screen 22 has handles on both sides. The oil-water mixture in the water tank enters from the top of the pretreatment mechanism 2 through the first water inlet pipe 1 and flows out through the second water inlet pipe 3 at the bottom. Solid impurities remain above the filter screen 22. When the filter screen 22 needs to be cleaned, hold the handles on both sides and lift it up to remove the filter screen 22.

[0034] The second water inlet pipe 3 of this invention is equipped with a one-way valve 31 to prevent gas in the oil-water separation mechanism 4 from escaping through the second water inlet pipe 3.

[0035] Furthermore, the first inlet pipe 1 and the outlet pipe 7 of this utility model are both equipped with shut-off valves, and the return water branch pipe 71 is equipped with a return water solenoid valve.

[0036] like Figure 1 As shown, the top of the oil storage tank 6 is also provided with a vent pipe 61, which is used to connect to the external space. This can prevent overpressure inside the oil storage tank 6, and by observing the side wall of the oil storage tank 6, the amount of oil stored inside can be determined. This makes it convenient for staff to replace the oil storage tank 6 at any time, and to let the full oil storage tank 6 continue to settle and further separate the oil.

[0037] In addition, the outer cylinder 41 of this utility model is provided with a heater 47 at the top. If the oil has poor fluidity at low temperature, the oil inside the outer cylinder 41 can be heated by the heater 47.

[0038] Work process:

[0039] 1. Open the valves of the first inlet pipe 1 and the outlet pipe 7, and inject oil-free water into the outer cylinder 41 of the oil-water separation mechanism 4 until the water flows out from the outlet pipe 7. Then start the microbubble generating mechanism 8 to replace the water in the first inlet pipe 1 with cooling water from the water storage tank. The cooling water contains lubricating oil.

[0040] 2. Oily wastewater flows into the pretreatment unit 2 and is filtered by the filter screen 22. Then it flows into the inner cylinder 42 through the second water inlet pipe 3. The dissolved air nozzle 81 of the microbubble generating unit 8 releases a large number of microbubbles. The bubbles are adsorbed on the oil molecules and carry the oil molecules to float. The oil floats to the top of the liquid surface. The water phase flows from the inner cylinder 42 to the outer cylinder 41 and flows to the water storage tank along the water outlet pipe 7. It is used as cooling water to cool the rollers of the grinding machine again. Part of the return water in the water outlet pipe 7 flows to the water storage tank 85 along the return water branch pipe 71 to provide dissolved air water for the microbubble generating unit 8.

[0041] 3. The gas inside the outer cylinder 41 enters the interior of the first housing 431 through the first exhaust pipe 44, and then exits through the through hole and the vent hole. When the oil level in the outer cylinder 41 rises, the oil enters the interior of the first housing 431, causing the float 435 to rise. Then the sealing plug 436 moves upward along the guide groove 4372, finally blocking the through hole. The push rod 4361 on the sealing plug 436 presses against the pressure sensor 4331, thereby activating the oil discharge solenoid valve 51. Under the action of gravity and gas pressure, the oil flows out from the outer cylinder 41. Once the oil discharge is slow and the gas pressure inside the outer cylinder 41 is too high, the second exhaust valve 45 opens to start venting until the gas pressure inside the outer cylinder 41 decreases.

[0042] 4. Once the oil storage tank 6 is full, it can be replaced without stopping the oil-water separation device. The oil in the oil storage tank 6 can be recycled after sedimentation treatment.

[0043] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this invention.

Claims

1. An oil-water separation device for treating oily wastewater, comprising a pretreatment mechanism (2) connected to a water storage tank, the pretreatment mechanism (2) being connected to an oil-water separation mechanism (4) via a second water inlet pipe (3), the upper end of the oil-water separation mechanism (4) being connected to an oil storage tank (6) via an oil outlet pipe (5), and the lower end being provided with a water outlet pipe (7), characterized in that: The oil-water separation mechanism (4) includes an outer cylinder (41) and an inner cylinder (42). The top of the inner cylinder (42) is open, and the bottom is fixedly connected to the outer cylinder (41). The second water inlet pipe (3) passes through the side wall of the outer cylinder (41) and is connected to the inside of the inner cylinder (42). The water outlet pipe (7) and the oil outlet pipe (5) are connected to the outer cylinder (41). The bottom of the inner cylinder (42) is provided with a dissolved air nozzle (81). The dissolved air nozzle (81) is connected to a microbubble generating mechanism (8). The oil-water mixture is separated by dissolved air bubbles. The top of the outer cylinder (41) is provided with a first exhaust valve (43). The oil outlet pipe (5) is provided with an oil discharge solenoid valve (51).

2. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: The first exhaust valve (43) includes a first housing (431), a first cover (432), a second cover (433), a vent plate (434), a float (435), and a sealing plug (436). The bottom of the first housing (431) is connected to the top of the outer cylinder (41) through a first exhaust pipe (44), and the top of the first housing (431) is provided with a first cover (432). The first cover (432) has a through hole in the middle. The second cover (433) is located above the first cover (432). The vent plate (434) Surrounding the outside of the vent and located between the first cover (432) and the second cover (433), the vent plate (434) is provided with a vent hole. The first housing (431) is provided with a float (435). The top of the float (435) is connected to a sealing plug (436). The sealing plug (436) is provided with a top rod (4361) on its upper part. The top rod (4361) passes through the through hole and extends toward the second cover (433). The second cover (433) is provided with a pressure sensor (4331) at its bottom.

3. The oil-water separation device for treating oily wastewater according to claim 2, characterized in that: The bottom of the first cover (432) is fixedly connected to the fixing ring (437). A first connecting rod (438) is provided on one side of the fixing ring (437). The other end of the first connecting rod (438) is hinged to a second connecting rod (439). The other end of the second connecting rod (439) is hinged to a float (435). A connecting block is provided in the middle of the second connecting rod (439). The connecting block is located at the end near the float (435). A connecting rod is provided at the bottom of the sealing plug (436). The connecting rod is hinged to the connecting block. Sliding rods (4362) are provided on both sides of the sealing plug (436). Guide members (4371) are provided on both sides of the fixing ring (437). A guide groove (4372) is provided on the guide member (4371). The sliding rod (4362) is located in the guide groove (4372) and moves up and down along the guide groove (4372).

4. The oil-water separation device for treating oily wastewater according to claim 1 or 3, characterized in that: The top of the outer cylinder (41) is also provided with a second exhaust valve (45). The installation position of the second exhaust valve (45) is higher than that of the first exhaust valve (43). The second exhaust valve (45) includes a second housing (451), an exhaust branch pipe (452), a sealing plate (453), and a return spring (454). The bottom of the second exhaust valve (45) is connected to the top of the outer cylinder (41) through a second exhaust pipe (46). Its side wall is provided with an exhaust branch pipe (452). The sealing plate (453) is located below the opening of the exhaust branch pipe (452). Its outer diameter is consistent with the inner diameter of the second housing (451). The top is provided with a guide sleeve. A guide rod is slidably provided in the guide sleeve. The guide rod is connected to the top wall of the second housing (451). The guide sleeve and the guide rod are covered with a return spring (454).

5. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: The microbubble generating mechanism (8) includes a dissolved air nozzle (81), an air compressor (82), a dissolved air tank (83), a pressurizing pump (84), and a water storage tank (85). A return water branch pipe (71) is provided on the water outlet pipe (7). The return water branch pipe (71) is connected to the water storage tank (85). The water in the water storage tank (85) flows into the dissolved air tank (83) through the pressurizing pump (84). The air outlet of the air compressor (82) is connected to the dissolved air tank (83). The dissolved air tank (83) dissolves air in the water. The side wall of the dissolved air tank (83) is connected to a gas supply pipe (86). After the gas supply pipe (86) passes through the bottom of the outer cylinder (41), it is connected to the dissolved air nozzle (81). The dissolved air nozzle (81) is fixed at the center of the bottom of the inner cylinder (42).

6. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: The inner cylinder (42) is provided with a baffle (421) at the top, and the baffle (421) extends from the top of the inner cylinder (42) to the outer cylinder (41).

7. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: The pretreatment mechanism (2) has an open top and is equipped with a support ring (21) and a filter screen (22) inside. The filter screen (22) overlaps the upper end of the support ring (21). The filter screen (22) has handles on both sides. The oil-water mixture in the water storage tank enters from the top of the pretreatment mechanism (2) through the first water inlet pipe (1) and flows out along the bottom second water inlet pipe (3).

8. The oil-water separation device for treating oily wastewater according to claim 7, characterized in that: The second water inlet pipe (3) is equipped with a one-way valve (31), and the first water inlet pipe (1) and the water outlet pipe (7) are both equipped with shut-off valves.

9. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: The top of the oil storage tank (6) is also equipped with a vent pipe (61).

10. The oil-water separation device for treating oily wastewater according to claim 1, characterized in that: A heater (47) is provided on the top of the outer cylinder (41).

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