An oil-water separation device and method

Abstract

The application provides an oil-water separation device and method, relates to the field of oil-water separation equipment, and aims to solve the problems of poor separation effect and low separation efficiency when oil-water discharged by machining is treated. The edge scraper is configured to scrape the edge position of the lifting belt, the viscous mixture attached to the lifting belt is scraped off, and the attachment of the viscous mixture on the lifting belt is reduced. The surface scraper is configured to scrape the drainage channel area of the oil scraping tongue, the attachment of the viscous mixture on the oil scraping tongue is reduced, the continuous and stable operation of the lifting belt is ensured, the stable drainage effect of the oil scraping tongue on the oil-water mixture is ensured, the oil-water conveying efficiency and conveying effect are improved, the oil-water can enter the oil-water separation mechanism smoothly, and the influence on the oil-water separation is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation equipment, and more specifically to an oil-water separation device and method. Background Technology

[0002] Oil-water mixtures have a wide range of sources. Large quantities of oil-water mixtures are generated during production processes in the petroleum, food, and textile industries. If oily wastewater from these industries is discharged directly without effective treatment, it will have a serious impact on ecosystems and the natural environment, polluting land and water sources. Oil and water are immiscible liquids, and oil-water separation is a type of liquid-liquid separation. The separation process is relatively complex: an oil-water mixture is input, the separated oil flows out of the upper outlet, and the separated water flows out of the lower outlet.

[0003] Chinese patent (CN205759881U) discloses a vertical oil-water separator that achieves oil-water buffering, oil-water separation, oil phase overflow, and water phase bottom outflow through a three-zone isolated oil-water separation mechanism. Moreover, the separation is thorough and the oil phase overflows and coalesces separately with good effect. It is aimed at the oil-water mixture generated in the organosilicon encapsulation process. The oil-water mixture contains fewer impurities. During the scraping process, the oil-water mixture lifted can be scraped off by the scraper tongue, and the part that falls from the end of the scraper tongue into the oil-water tank can be lifted again. However, the cutting fluid in the machining workshop also carries waste residue and impurities generated during cutting, resulting in solid impurities in the oil-water mixture in the oil-water tank. The liquid impurities settle to the bottom of the tank, while the oil impurities form a viscous solid-liquid mixture that floats or suspends within the tank. During the lifting and scraping processes, this solid-liquid mixture adheres to the lifting belt, accumulating on its sides. As it moves, it enters the inner ring of the belt, causing problems such as belt jamming and deceleration, making it difficult to meet the requirements of long-term operation. It also adheres to the scraper tongue, causing blockage, reducing the flow range of oil and water on the scraper tongue, increasing the flow rate, impacting the oil-water buffer zone, and affecting oil-water separation. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing an oil-water separation device and method. By configuring an edge scraper to work in conjunction with the oil scraping tongue, the viscous mixture entrained in the oil and water reduces the impact of the conveyor belt on the operation of the conveyor belt, improves the oil-water conveying efficiency and effect, and allows the oil and water to enter the oil-water separation mechanism smoothly, reducing the impact on oil-water separation.

[0005] The first objective of this invention is to provide an oil-water separation device, which employs the following solution:

[0006] include:

[0007] The oil-water lifting mechanism is equipped with a lifting belt and an oil scraper. One end of the oil scraper is attached to the descending side of the lifting belt, and the other end of the oil scraper extends obliquely towards the oil-water separation mechanism.

[0008] The oil-water separation mechanism is divided into multiple zones according to the oil-water flow direction by partitions. At least one zone is an oil-water separation zone, and an oil outlet is provided at the top of the oil-water separation zone.

[0009] The oil scraper tongue is attached to one end of the lifting belt and has an edge scraper. The edge scraper contacts the edge of the lifting belt, and the contact line between the oil scraper tongue, the edge scraper and the lifting belt is U-shaped.

[0010] Furthermore, the scraper tongue is arranged at an angle, with the plane of the edge scraper being coplanar with the plane of the scraper tongue, and is arranged at an angle following the scraper tongue.

[0011] Furthermore, the oil scraper includes a first segment and a second segment that are continuously distributed. One end of the first segment is connected to the oil scraper, and the other end of the first segment is connected to the second segment. The first segment contacts the side of the lifting belt, and the second segment extends to the inner ring of the lifting belt and contacts the surface of the inner ring of the lifting belt.

[0012] Furthermore, the second section of the edge scraper is arranged at an angle relative to the first section, so that the end of the second section away from the first section is lifted towards the top of the lifting belt.

[0013] Furthermore, edge scrapers are installed on both sides of the lifting belt corresponding to the oil scraper tongue, and an oil scraping channel is formed between the two edge scrapers for the lifting belt to pass through. The edge scrapers and the oil scraper tongue can vibrate under the action of the lifting belt.

[0014] Furthermore, the oil scraper is equipped with a surface scraper, which can move along the plane of the upper surface of the oil scraper under the drive mechanism. The surface scraper adheres to the surface of the oil scraper and forms a scraping action on the surface of the oil scraper during movement.

[0015] Furthermore, the scraper tongue forms a flow channel for the oil-water mixture lifted by the lifting belt to flow, and the surface scraper covers the lower half of the flow channel.

[0016] Furthermore, impurity boxes are provided at both ends of the surface scraper's movement trajectory, with the openings of the impurity boxes facing the drop position where the surface scraper scrapes off the viscous mixture.

[0017] A second object of the present invention is to provide a method of operation utilizing the oil-water separation device as described in the first object, comprising:

[0018] When the lifting belt is working, the oil and water in the oil and water tank are stuck on the surface of the lifting belt and come into contact with the oil scraper tongue at the descending position.

[0019] The scraper tongue and edge scraper scrape the lifting belt, transferring the oil-water mixture and sticky mixture adhering to the lifting belt to the scraper tongue and edge scraper;

[0020] The oil-water mixture and the viscous mixture are collected at the scraper tongue and move along the scraper tongue. After the viscous mixture is removed, the oil-water mixture is discharged into the oil-water separation mechanism.

[0021] The oil-water separation unit separates the input oil-water mixture.

[0022] Furthermore, the edge scraper extends to the inner ring of the lifting belt and contacts the surface of the inner ring of the lifting belt to scrape off the sticky mixture pushed to the inner ring of the lifting belt by the first section.

[0023] Compared with the prior art, the advantages and positive effects of this invention are:

[0024] (1) In view of the problem that the separation effect of oil and water discharged from machining is poor and the separation efficiency is low, by configuring an edge scraper to work in conjunction with the oil scraping tongue, the influence of the viscous mixture entrained in the oil and water on the operation of the lifting belt is reduced, the oil and water conveying efficiency and conveying effect are improved, and the oil and water can enter the oil and water separation mechanism smoothly, reducing the impact on oil and water separation.

[0025] (2) The edge scraper is configured to scrape the edge of the lifting belt to remove the sticky mixture adhering to the lifting belt and reduce its adhesion to the lifting belt. The surface scraper is configured to scrape the drainage channel area of ​​the oil scraper tongue to reduce its adhesion to the oil scraper tongue and ensure the continuous and stable operation of the lifting belt and the stable drainage effect of the oil scraper tongue on the oil-water mixture.

[0026] (3) One end of the edge scraper is connected to the scraper tongue, and the other end extends to the edge of the lifting belt, covering the edge of the lifting belt. The contact line of the scraper tongue, the edge scraper and the lifting belt is adjusted to a concave shape. When the viscous mixture gradually accumulates at the edge of the lifting belt, the edge scraper scrapes the viscous mixture from the side edge of the lifting belt and makes the viscous mixture fall on the edge scraper, reducing the impact of the viscous mixture on the operation of the lifting belt and improving the operation stability.

[0027] (4) The second section of the edge scraper is arranged at an angle to the first section, so that the end of the second section away from the first section is raised upwards. This can not only remove the sticky mixture from the inner ring of the lifting belt, but also prevent the sticky mixture from moving to other areas not covered by the edge scraper, thereby improving the effect of removing the sticky mixture and reducing residue.

[0028] (5) The scraper tongue and edge scraper will vibrate due to the action of the lifting belt. After the oil-water mixture and viscous mixture are transferred to the scraper tongue and edge scraper, the vibration will promote the transfer of the oil-water mixture and viscous mixture from the edge scraper to the scraper tongue and promote their movement on the scraper tongue.

[0029] (6) A surface scraper covers the lower half of the drainage channel to maintain the cleanliness of the lower half of the drainage channel and prevent large volumes of viscous mixture from accumulating here and affecting the stable discharge of the oil-water mixture. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a schematic diagram of the oil-water separation device in Embodiments 1 and 2 of the present invention.

[0032] Figure 2 This is a side view schematic diagram of the oil-water separation device in Embodiments 1 and 2 of the present invention.

[0033] Figure 3 This is a top view schematic diagram of the oil-water separation device in Embodiments 1 and 2 of the present invention.

[0034] Figure 4 This is a schematic diagram of the oil scraper tongue working in conjunction with the lifting belt in embodiments 1 and 2 of the present invention.

[0035] Figure 5 This is a schematic diagram showing the distribution of the surface scraper in Embodiments 1 and 2 of the present invention.

[0036] Figure 6 This is a schematic diagram showing the distribution of the edge scrapers in Embodiments 1 and 2 of the present invention.

[0037] Among them, 1. oil-water lifting mechanism, 2. oil-water separation mechanism, 3. oil scraper tongue, 4. lifting belt, 5. edge scraper, 6. first section, 7. second section, 8. oil scraping channel, 9. surface scraper, 10. impurity box, 11. drainage channel, 12. oil-water buffer zone, 13. oil-water separation zone, 14. aqueous phase temporary storage zone, 15. overflow port, 16. oil receiving box, 17. oil outlet, 18. through hole, 19. return water pipe. Detailed Implementation

[0038] Example 1

[0039] In a typical embodiment of the present invention, such as Figures 1-6 As shown, an oil-water separation device is presented.

[0040] The oil-water tank collects and temporarily stores the oil-water mixture discharged from various processing stations in the workshop. The solid impurities entrained in the oil-water mixture will mix with the oil phase, and the resulting viscous mixture will adhere to the lifting belt 4. As the belt runs, it will extend to the non-adhesive working area of ​​the lifting belt 4, affecting the normal operation of the belt. At the same time, the mixture will also adhere to the scraper tongue 3, affecting the flow range of the oil-water mixture on the scraper tongue 3. This causes the oil-water mixture to pass through the narrow channel, increasing the flow rate and making it difficult to smoothly enter the oil-water buffer zone 12, thus affecting the separation of oil and water.

[0041] Based on this, this embodiment provides an oil-water separation device. By configuring an edge scraper 5 to scrape the edge of the lifting belt 4, the sticky mixture attached to the lifting belt 4 is scraped off, reducing its adhesion to the lifting belt 4. By configuring a surface scraper 9 to scrape the drainage channel 11 area of ​​the oil scraper tongue 3, the adhesion and retention of the oil scraper tongue 3 is reduced, ensuring the continuous and stable operation of the lifting belt 4 and the stable drainage effect of the oil scraper tongue 3 on the oil-water mixture.

[0042] The oil-water separation device of this embodiment will now be described in detail with reference to the accompanying drawings.

[0043] See Figure 1 The oil-water separation mechanism 2 mainly includes an oil-water lifting mechanism 1, an oil receiving box 16, and an oil-water separation mechanism 2. The oil-water lifting mechanism 1 lifts oil and water from the oil-water tank and inputs them into the oil-water separation mechanism 2. The oil-water separation mechanism 2 separates the oil and water. The separated oil phase flows into the oil receiving box 16, and the separated water phase flows into the water tank.

[0044] The oil-water lifting mechanism 1 includes a lifting belt 4, lifting belt rollers 4, and an oil scraper tongue 3, such as Figure 2 , Figure 3 As shown, the lifting belt 4 is fitted onto the first lifting belt roller 4 at the top and the second lifting belt roller 4 at the bottom, and is tensioned and driven by the lifting belt roller 4. At least one lifting belt roller 4 is the driving roller, driving the lifting belt 4 to rotate. The lifting belt roller 4 that cooperates with the lifting belt 4 is arranged vertically. Therefore, the lifting belt 4 has an overall vertical structure. When the lifting belt 4 rotates, one side is the rising surface and the other side is the falling surface. One end of the oil scraper tongue 3 is close to the falling surface of the lifting belt 4, and the other end extends obliquely towards the oil-water separation mechanism 2. The second lifting belt roller 4 is immersed below the liquid surface of the oil-water tank.

[0045] As the lifting belt 4, which acts as the driving roller, rotates, the lifting belt 4 rotates under the support of the lifting belt 4 roller. The area of ​​the lifting belt 4 below the oil and water tank surface comes into contact with the oil and water, and the oil and water stick to the surface of the lifting belt 4. When the lifting belt 4 rotates to the descending side, the oil scraper tongue 3 scrapes off the oil and water on the surface of the lifting belt 4 together and guides it to the oil-water separation mechanism 2.

[0046] It should be noted that the descending surface of the lifting belt 4 is in line contact with the end of the scraper tongue 3. As the scraping action is performed, the oil and water will tend to flow from the center to both ends at the contact line. The oil and water will fall into the oil and water tank, while the viscous mixture carried in the oil and water will gradually accumulate at both ends of the contact line. The scraper tongue 3 cannot contact the accumulation position, which causes the viscous mixture to adhere to the edge of the lifting belt 4.

[0047] It is understandable that the width of the scraper tongue 3 is adapted to the width of the lifting belt 4. The viscous mixture will accumulate on the side of the lifting belt 4 where the scraper tongue 3 cannot reach. Because the adhesive force between the viscous mixture and the side of the lifting belt 4 is large, it cannot be removed from the lifting belt 4 after circulating with the lifting belt 4 and contacting the oil and water in the oil and water tank. With continuous operation, the amount of viscous mixture accumulated increases and will gradually spread to the mating position between the roller of the lifting belt 4 and the lifting belt 4, causing slippage, jamming, deceleration and other faults.

[0048] In this regard, such as Figure 4 , Figure 5 As shown, an edge scraper 5 is provided at one end of the scraper tongue 3 that is attached to the lifting belt 4. One end of the edge scraper 5 is connected to the scraper tongue 3, and the other end extends to the edge of the lifting belt 4, covering the edge of the lifting belt 4. The contact line of the scraper tongue 3, the edge scraper 5 and the lifting belt 4 is adjusted to a concave shape. When the viscous mixture gradually accumulates towards the edge of the lifting belt 4, the edge scraper 5 scrapes the viscous mixture from the side edge of the lifting belt 4 and makes the viscous mixture fall onto the edge scraper 5.

[0049] The plane of the edge scraper 5 is coplanar with the plane of the oil scraper tongue 3. The oil scraper tongue 3 is arranged at an angle, so the edge scraper 5 is also arranged at an angle. After the viscous mixture is scraped off and falls onto the edge scraper 5, it moves down along the angled edge scraper 5 to the oil scraper tongue 3, waiting for the next step of processing.

[0050] It should be noted that after the edge scraper 5 contacts the side of the lifting belt 4, its contact line is adjusted from a straight line to a concave line. However, some viscous mixture is still pushed to the inner ring of the lifting belt 4 after contacting the edge scraper 5, causing the viscous mixture to enter between the lifting belt 4 and the roller of the lifting belt 4. In this embodiment, the edge scraper 5 is configured as a two-section continuous structure in an L-shape. One end of the first section 6 of the edge scraper 5 is connected to the oil scraper tongue 3, and the other end is connected to the second section 7 of the edge scraper 5. The first section 6 contacts the side of the lifting belt 4, and the second section 7 extends to the inner ring of the lifting belt 4 and contacts the inner ring surface of the lifting belt 4, scraping off the viscous mixture pushed to the inner ring of the lifting belt 4 by the first section 6.

[0051] Meanwhile, to prevent the second section 7 edge scraper 5 from pushing the viscous mixture to areas it cannot reach again, based on the fact that the edge scraper 5 and the oil scraper tongue 3 are arranged in the same inclined plane, the second section 7 of the edge scraper 5 is configured to be inclined to the first section 6, so that the end of the second section 7 away from the first section 6 is lifted upwards. This can not only remove the viscous mixture from the inner ring of the lifting belt 4, but also prevent the viscous mixture from moving to other areas not covered by the edge scraper 5, thereby improving the effect of removing the viscous mixture and reducing residue.

[0052] After the edge scrapers 5 are installed on both sides of the lifting belt 4 corresponding to the oil scraper tongue 3, an oil scraping channel 8 is formed between the two edge scrapers 5 for the lifting belt 4 to pass through. Through the relative movement of the edge scrapers 5 and the lifting belt 4, the viscous oil and water on the lifting belt 4 are scraped, so that the oil-water mixture, viscous mixture, etc. are transferred from the lifting belt 4 to the oil scraper tongue 3 and the edge scrapers 5.

[0053] Since the scraper tongue 3 and the edge scraper 5 remain in contact with the lifting belt 4, the scraper tongue 3 and the edge scraper 5 will vibrate due to the action of the lifting belt 4 during the operation of the lifting belt 4. After the oil-water mixture and viscous mixture are transferred to the scraper tongue 3 and the edge scraper 5, the vibration will promote the transfer of the oil-water mixture and viscous mixture from the edge scraper 5 to the scraper tongue 3 and promote their movement on the scraper tongue 3.

[0054] Combination Figure 5 and Figure 6 The scraper tongue 3 forms a flow channel 11 for the oil-water mixture lifted by the lifting belt 4. After the viscous mixture is transferred to the scraper tongue 3, it is difficult to move downward along the scraper tongue 3 and be discharged due to its viscosity. The accumulation of the viscous mixture on the flow channel 11 of the scraper tongue 3 reduces the effective range of the flow channel 11. Under the premise that the total amount of oil-water mixture remains unchanged, the flow speed of the oil-water mixture on the scraper tongue 3 increases. When it is discharged from the end of the scraper tongue 3 to the subsequent oil-water separation mechanism 2, it impacts the oil-water mixture in the oil-water separation mechanism 2 and affects the separation of oil and water.

[0055] To address this, a surface scraper 9 and an impurity box 10 are provided for the oil scraper tongue 3. The surface scraper 9 can move along the plane of the upper surface of the oil scraper tongue 3 under the drive mechanism. The surface scraper 9 adheres to the surface of the oil scraper tongue 3 and forms a scraping action on the surface of the oil scraper tongue 3 during movement.

[0056] The surface scraper 9 covers the lower half of the drainage channel 11 to maintain the cleanliness of the lower half of the drainage channel 11 and prevent large volumes of viscous mixture from accumulating here and affecting the stable discharge of the oil-water mixture.

[0057] Impurity boxes 10 are provided at both ends of the movement trajectory of the surface scraper 9. The opening of the impurity box 10 faces the drop position of the surface scraper 9 where the sticky mixture is scraped off. The impurity box 10 receives the sticky mixture scraped off by the surface scraper 9. In order to reduce the adhesion of the sticky mixture on the surface scraper 9, the working position of the surface scraper 9 is treated with friction reduction.

[0058] The drive mechanism can be a reciprocating moving part, such as a lead screw and slider mechanism in conjunction with a motor, a gear and rack mechanism, etc. The surface scraper 9 is connected to the output end of the reciprocating moving part. Under the drive of the reciprocating drive part, it performs reciprocating motion along the surface of the scraper tongue 3 to complete the process of scraping off the sticky mixture on the surface of the scraper tongue 3.

[0059] It should be noted that the position where the surface scraper 9 contacts the surface of the oil scraper tongue 3 can adopt a comb-like structure. By reasonably configuring the gap of the comb-like structure, it can scrape off large volumes of viscous mixtures and screen small volumes of impurities that do not affect the flow of the oil-water mixture, thereby reducing the impact of the scraping action of the surface scraper 9 itself on the oil-water mixture.

[0060] Among them, see Figure 3 The oil-water separation mechanism 2 is divided into an oil-water buffer zone 12, an oil-water separation zone 13, and a water phase temporary storage zone 14 by a partition plate according to the oil-water flow direction. The oil-water separation zone 13 and the water tank temporary storage zone are arranged side by side. The top of the partition plate of the oil-water buffer zone 12 and the oil-water separation zone 13 is provided with an overflow port 15. The oil-water separation zone 13 and the oil receiving box 16 are connected by an oil outlet 17 provided at the top of the partition plate of the two. The bottom of the partition plate of the oil-water separation zone 13 and the water phase temporary storage zone 14 is provided with a through hole 18.

[0061] The scraper tongue 3 scrapes the oil-water mixture on the surface of the lifting belt 4 together to the oil-water buffer zone 12. When the liquid level in the oil-water buffer zone 12 reaches the overflow port 15, the oil and water on the surface overflow to the oil-water separation zone 13 for separation. The oil phase on the surface flows to the oil receiving box 16 through the oil outlet 17, and the water phase at the bottom flows to the water phase temporary storage zone 14 through the through hole 18, thereby achieving the purpose of oil-water separation.

[0062] A return water pipe 19 is fixed in the middle of the aqueous phase storage area 14. The bottom of the return water pipe 19 is connected to the water tank, which carries the stratified aqueous phase to the water tank at the bottom of the separator, preventing the liquid level in the aqueous phase storage area 14 from being too high and affecting the separation of the aqueous phase. The height of the return water pipe 19 is lower than the height of the aqueous phase storage area 14, which can generate a water pressure difference. The aqueous phase that is higher than the height of the return water pipe 19 is directly carried to the water tank by the return water pipe 19, so that the entire oil-water separation mechanism 2 can work continuously without emptying the aqueous phase storage area 14.

[0063] The height of the overflow port 15 is the same as or higher than that of the oil outlet 17 to avoid the backflow of oil and water affecting the separation effect.

[0064] The surface of the lifting belt 4 is smooth, which facilitates the operation of the oil scraper tongue 3 and the edge scraper 5, and can thoroughly scrape off the oil and water on the surface of the lifting belt 4. The width of the oil scraper tongue 3 is the same as that of the lifting belt 4, which reduces the amount of oil and water missed on the surface of the lifting belt 4. For oil, water and viscous mixtures in uncovered areas, the edge scraper 5 is used to scrape them off.

[0065] Optionally, the scraper tongue 3 and the edge scraper 5 can be made of hard plastic, ensuring thorough scraping without damaging the lifting belt 4. Alternatively, the scraper tongue 3 can be made of stainless steel, offering a long service life, eliminating the need for frequent replacements, and providing thorough scraping with minimal friction.

[0066] A filter screen is installed at one end of the oil outlet 17 in the oil-water separation zone 13 to prevent non-oil impurities from flowing into the oil phase and avoid repeated separation operations. The oil scraper tongue 3 has an outward-opening funnel shape, which gradually increases the flow area of ​​oil and water in the oil scraper tongue 3, preventing excessive flow velocity from entering the oil-water buffer zone 12, thereby avoiding affecting the separation of oil and water.

[0067] Example 2

[0068] In another typical embodiment of the present invention, such as Figures 1-6 As shown, a working method is presented.

[0069] Using the oil-water separator as described in Example 1, the following steps are included:

[0070] When the lifting belt 4 is working, the oil and water in the oil and water tank are stuck on the surface of the lifting belt 4 and come into contact with the oil scraper tongue 3 at the descending position.

[0071] The scraper tongue 3 and the edge scraper 5 scrape the lifting belt 4 to transfer the oil-water mixture and sticky mixture adhering to the lifting belt 4 to the scraper tongue 3 and the edge scraper 5;

[0072] The oil-water mixture and the viscous mixture are collected at the scraper tongue 3 and move along the scraper tongue 3. After the viscous mixture is removed, the oil-water mixture is discharged into the oil-water separation mechanism 2.

[0073] The oil-water separation unit 2 separates the input oil-water mixture.

[0074] The sticky mixture on the surface of the scraper tongue 3 is cleaned by the surface scraper 9, reducing the impact of the sticky mixture on the flow of the oil-water mixture on the scraper tongue 3.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil-water separation device, characterized by, The oil-water lifting mechanism is provided with a lifting belt and an oil scraping tongue, one end of the oil scraping tongue is attached to one side of the descending surface of the lifting belt, and the other end of the oil scraping tongue extends obliquely to the oil-water separation mechanism. The oil-water separation mechanism is divided into multiple areas by a partition according to the flow direction of oil and water, at least one area is an oil-water layering area, and the top end of the oil-water layering area is provided with an oil outlet. The end of the oil scraping tongue attached to the lifting belt is provided with an edge scraper, the edge scraper contacts the edge of the lifting belt, and the contact line of the oil scraping tongue, the edge scraper and the lifting belt is in a concave shape. The edge scraper is arranged in the same plane as the oil scraping tongue, and is inclined with the oil scraping tongue. The oil scraping tongue and the edge scraper vibrate under the action of the lifting belt, promoting the transfer of the oil-water mixture and the viscous mixture from the edge scraper to the oil scraping tongue. The oil scraping tongue is provided with a surface scraper, which can move along the plane of the upper surface of the oil scraping tongue under the action of a driving mechanism, and the surface scraper contacts the surface of the oil scraping tongue and forms a scraping effect on the surface of the oil scraping tongue during movement. The edge scraper includes a first section and a second section arranged in series, one end of the first section is connected to the oil scraping tongue, the other end of the first section is connected to the second section, the first section contacts the side surface of the lifting belt, and the second section extends to the inner ring of the lifting belt and contacts the surface of the inner ring of the lifting belt.

2. The oil-water separation device of claim 1, wherein, The second section of the edge scraper is arranged obliquely relative to the first section, so that the end of the second section away from the first section is raised towards the top end of the lifting belt.

3. The oil-water separation device of claim 2, wherein, Edge scrapers are installed on both sides of the oil scraping tongue corresponding to the edge positions of the lifting belt, and an oil scraping channel is formed between the two edge scrapers for the lifting belt to pass through.

4. The oil-water separation device of claim 2, wherein, The oil scraping tongue forms a drainage channel for the flow of the oil-water mixture lifted by the lifting belt, and the surface scraper covers the lower half of the drainage channel.

5. The oil-water separation device of claim 1, wherein, Impurity boxes are arranged at both ends of the movement track of the surface scraper, and the opening of the impurity box is directed towards the material falling position where the surface scraper removes the viscous mixture.

6. The oil-water separation device of claim 1, wherein, The lifting belt works to adhere the oil-water mixture in the oil-water tank to the surface of the lifting belt and contact the oil scraping tongue at the descending surface position; 7. A method of working, using the oil-water separation device according to any one of claims 1 to 6, characterized by, The oil scraping tongue and the edge scraper scrape the lifting belt to transfer the oil-water mixture and the viscous mixture adhered to the lifting belt to the oil scraping tongue and the edge scraper; The oil-water mixture and the viscous mixture are collected on the oil scraping tongue and move along the oil scraping tongue, and after removing the viscous mixture, the oil-water mixture is discharged into the oil-water separation mechanism; The oil-water separation mechanism separates the input oil-water mixture. The edge scraper extends to the inner ring of the lifting belt and contacts the surface of the inner ring of the lifting belt, and scrapes the viscous mixture pushed to the inner ring of the lifting belt by the first section. ​ 8. The method of claim 7, wherein the step of operating comprises the step of: ​

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