Sludge oil tank with drainage function

Abstract

The invention provides a slop oil tank with a drainage function, and relates to the technical field of oily sewage treatment equipment, the slop oil tank comprises a tank body, a baffle is arranged in the tank body, a partition plate I is arranged below the baffle, and the baffle and the partition plate I divide the slop oil tank into a slop oil inlet area, a drainage area and a storage area; a water inlet is formed in the lower portion of the first partition plate, a first floating plate is slidably arranged in the storage area, and the lower portion of the first floating plate is connected with a water retaining block capable of blocking the water inlet through a rope. The dirty oil tank is divided into the dirty oil inlet area, the drainage area and the storage area, after oil-containing sewage is layered in the storage area, a water layer is discharged from the drainage area, and the situation that a drainage pump directly pumps the water layer on the lower layer, vortex is easily formed, and meanwhile discharged dirty oil is doped during drainage is reduced; the first floating plate and the baffle plate block the entering oily sewage twice, so that the impact of the oily sewage on the layered liquid level is relieved, and the fluctuation of the liquid level is reduced, thereby reducing the dirty oil entering the drainage area from the water inlet and reducing the dirty oil doped in the discharged water.

Description

Technical Field

[0001] The invention relates to the technical field of oily sewage treatment equipment, and in particular to a waste oil tank with a drainage function. Background Art

[0002] In the petrochemical industry, some oily wastewater is generated, and this type of wastewater usually needs to be treated before it can be discharged. Due to the different polarities of water and oil, water and oil are incompatible, and the density of oil and water is different. Therefore, natural sedimentation is generally used to remove grease from wastewater to achieve preliminary treatment of oily wastewater. The waste oil tank is a container used for preliminary treatment of oily wastewater. Its main function is to treat wastewater containing grease and suspended matter. The waste oil tank uses the difference in the specific gravity of oil and water to allow the wastewater to naturally precipitate in the tank, collect the lower layer of wastewater, and then transport the wastewater to the sewage treatment equipment for treatment, thereby realizing the recycling of wastewater. In order to improve the efficiency of sewage treatment, oily wastewater can be continuously transported to the waste oil tank. Due to the limited capacity of the waste oil tank, the wastewater at the bottom needs to be discharged in time and transported to the sewage treatment equipment.

[0003] For example, a patent document with announcement number CN220907333U discloses a new type of high-efficiency oil separation and oil removal device, which includes a filter tank, an oil-water separation tank and a treatment barrel. The filter tank is provided with a sewage inlet at the upper left end and a water outlet at the lower right end. The oil-water separation tank is provided with a water inlet 1 in the middle of the top and a sewage outlet at the middle of the bottom. A sewage valve is provided on the sewage outlet. The oil-water separation tank is provided with an oil outlet at the upper right end and a water outlet 1 at the lower end.

[0004] In the device, the oily wastewater is filtered through the filter tank and then separated in the oil-water separation tank. However, the oily wastewater is continuously added to the above-mentioned oil-water separation tank. Since the oil layer is located above the water layer, the oily wastewater will cause fluctuations in the liquid surface that has been settled and stratified, which may easily cause part of the oil close to the water layer to be discharged at the drain outlet during drainage. When the oil-water separation tank is drained, a drainage pump is also used to drain the water, and a vortex is easily formed at the drain outlet, causing the stratified dirty oil to be discharged through the drain outlet, thereby affecting the initial treatment effect of the oily wastewater. Summary of the invention

[0005] In view of this, the present invention provides a waste oil tank with drainage function to solve the technical problems that the added oily wastewater will cause fluctuations in the liquid surface that has already been settled and stratified, and that when the drainage pump drains water, a vortex is easily formed at the drainage outlet, causing the stratified waste oil to be discharged along with the wastewater.

[0006] In order to solve the above technical problems, the present invention provides a waste oil tank with drainage function, comprising a tank body, the tank body having a waste oil inlet, an oil discharge port and a water discharge port, a baffle is arranged in the tank body, a partition 1 is arranged below the baffle, and the baffle and the partition 1 divide the waste oil tank into a waste oil inlet area, a water discharge area and a storage area; the waste oil inlet is located in the waste oil inlet area, the oil discharge port is located in the storage area, and the water discharge port is located in the water discharge area; A water inlet is provided at the lower part of the partition plate 1, so that the water in the storage area flows into the drainage area through the water inlet. A floating plate 1 is slidably provided in the storage area, and a water retaining block capable of blocking the water inlet is connected to the lower part of the floating plate 1 by a rope. The baffle includes a sealing plate arranged above the drainage area and a filter plate arranged in the storage area. Both the filter plate and the floating plate are provided with liquid holes. The density of the dirty oil is less than the density of water. The density of the floating plate is between the density of the dirty oil and the density of water, so that the floating plate can float between the oil layer and the water layer.

[0007] By adopting the above technical solution, the oily sewage enters the oily oil inlet area from the oily oil inlet, enters the storage area through the filter plate of the baffle, and then falls into the lower part of the storage area through the floating plate 1. After the oily sewage is settled and stratified in the storage area, the upper layer is the oil layer and the lower layer is the water layer. Since the density of the floating plate 1 is between the density of the oily oil and the density of the water, the floating plate 1 can float between the oil layer and the water layer. With the continuous input of oily sewage, the floating plate 1 drives the water retaining block to gradually rise. After the water retaining block rises, it can lose the blockage of the water inlet, the water inlet opens, and the water below the floating plate 1 enters the drainage area through the water inlet and is discharged through the drainage outlet in the drainage area, reducing the possibility of vortexes being easily formed when the drainage pump directly extracts the water layer in the lower layer, which causes the dirty oil discharged while being mixed with the drainage; and because the floating plate 1 can float between the water layer and the oil layer, the bottom of the floating plate 1 is the water layer, the water inlet is located below the floating plate 1, and the water layer flows into the drainage area from the water inlet, and the floating plate 1 drives the water retaining block to move upward, the water retaining block increases the counterweight of the floating plate 1, and the floating plate 1 delays its upward movement, which can reduce the amount of dirty oil entering the lower water layer after stratification, and can also reduce the situation where the oily sewage that enters directly enters the bottom of the floating plate 1 before stratification, thereby reducing the dirty oil flowing into the drainage area from the water inlet and reducing the dirty oil mixed in the water discharged from the drainage outlet. The floating plate and the baffle block the oily wastewater entering from the waste oil inlet twice, which reduces the impact of the oily wastewater on the stratified liquid surface and reduces the fluctuation of the liquid surface, thereby reducing the waste oil entering the drainage area from the water inlet and reducing the waste oil mixed in the water discharged from the drainage outlet, which is beneficial to improving the initial treatment effect of the oily wastewater.

[0008] Preferably, a partition 2 parallel to partition 1 is provided in the drainage area, a water storage area is reserved between partition 2 and partition 1, and the height of partition 2 is less than the height of partition 1, so that water flowing through the water inlet enters the water storage area and can enter the drainage area from above partition 1 and be discharged from the drainage outlet.

[0009] By adopting the above technical solution, a water storage area is left between the partition plate 1 and the partition plate 2, and when the drain outlet is pumped with a water pump, the fluctuation of the water surface at the water inlet is reduced.

[0010] Preferably, a slide groove is provided on one side of the partition located in the storage area, two slide grooves are provided and are respectively located on both sides of the water inlet, and a protrusion that can be stuck in the slide groove is provided on the water retaining block to enable the water retaining block to slide along the slide groove.

[0011] By adopting the above technical solution, the slide groove and the protrusion guide the movement of the water retaining block, which is conducive to the water retaining block falling into the original position when the floating plate falls, and continues to keep the water inlet blocked.

[0012] Preferably, the dirty oil inlet is arranged at a position above the sealing plate, so that the oily wastewater entering from the dirty oil inlet contacts the sealing plate and then flows onto the filter plate, and then flows into the storage area.

[0013] By adopting the above technical solution, the oily wastewater flowing in from the waste oil inlet first falls onto the sealing plate, and avoids directly impacting the filter plate and falling into the storage area through the liquid holes, which is helpful to mitigate the impact of the oily wastewater on the already stratified liquid surface in the storage area and reduce the fluctuation of the liquid surface.

[0014] Preferably, a second floating plate is slidably provided on the baffle, and a liquid-passing hole is also provided on the second floating plate, and the density of the second floating plate is equal to the density of the first floating plate.

[0015] By adopting the above technical solution, when there is a lot of dirty oil and water stored in the storage area, float plate 1 moves to contact the lower end surface of the baffle, and the oily wastewater continues to be added, which can push float plate 2 to move upward. Float plate 2 floats between the water layer and the oil layer, slowing down the impact of the newly added oily wastewater on the already stratified liquid surface and reducing the fluctuation of the liquid surface.

[0016] Preferably, both the first and second floating plates are in contact with the inner wall of the tank body, and the first and second floating plates can slide up and down to scrape the dirty oil suspended on the inner wall.

[0017] By adopting the above technical solution, as the floating plates 1 and 2 slide up and down, the edges of the floating plates 1 and 2 can scrape off the dirty oil on the inner wall of the tank body, which is helpful to reduce the subsequent cleaning work inside the tank body.

[0018] Preferably, a retaining ring capable of limiting the position of the floating plate is provided in the storage area.

[0019] By adopting the above technical solution, the retaining ring limits the position of the floating plate, and when the floating plate moves to contact the retaining ring, the water retaining block blocks the water inlet.

[0020] Preferably, a drainage hole is provided below the second partition, and a sealing plug is provided in the drainage hole.

[0021] By adopting the above technical solution, when the dirty oil tank needs to be cleaned, a person manually enters the dirty oil tank, removes the sealing plug, and the water in the water storage area flows into the drainage area to flush the drainage area and is discharged from the drainage port.

[0022] The beneficial effects of the above technical solution of the present invention are as follows: 1. The present invention divides the waste oil tank into a waste oil inlet area, a drainage area and a storage area by setting a baffle and a partition. After the oily wastewater is stratified in the storage area, the floating plate drives the water retaining block to move upward, and the water layer at the lower layer flows into the drainage area from the water inlet and then is discharged through the drainage port, which reduces the vortex that is easily formed when the drainage pump directly extracts the water layer of the lower layer, causing the waste oil to be mixed with the drainage at the same time; the floating plate drives the water retaining block to move upward, and the water retaining block increases the counterweight of the floating plate, so that the floating plate delays the upward movement, which can reduce the stratification after the stratification. The dirty oil enters the lower water layer, which can also reduce the situation where the incoming oily sewage enters directly under the floating plate 1 before being stratified, thereby reducing the dirty oil flowing into the drainage area from the water inlet; the floating plate 1 and the baffle block the oily sewage entering from the dirty oil inlet twice, which slows down the impact of the oily sewage on the stratified liquid surface and reduces the fluctuation of the liquid surface, thereby reducing the dirty oil entering the drainage area from the water inlet and reducing the dirty oil mixed in the water discharged from the drainage port, which is beneficial to improving the initial treatment effect of the oily sewage.

[0023] 2. In the drainage area of ​​the present invention, a partition plate 2 is provided which is parallel to the partition plate 1, and a water storage area is reserved between the partition plate 2 and the partition plate 1. When the drainage outlet uses a water pump to pump water, the fluctuation of the water surface at the water inlet is reduced.

[0024] 3. The dirty oil inlet of the present invention is arranged at a position above the sealing plate. The oily wastewater flowing in from the dirty oil inlet first falls onto the sealing plate, and avoids directly impacting the filter plate and falling into the storage area through the liquid hole, which is beneficial to mitigate the impact of the oily wastewater on the stratified liquid surface in the storage area and reduce the fluctuation of the liquid surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the dirty oil tank with drainage function of the present invention; Figure 2 It is a cross-sectional view of the tank body of the present invention when the water retaining block blocks the water inlet; Figure 3 It is a cross-sectional view of the tank body of the present invention when the second floating plate rises after the water inlet is opened; Figure 4 It is a schematic structural diagram of a baffle, a partition 1, a partition 2 and a floating plate 1 of the present invention; Figure 5 It is a cross-sectional view of the baffle, the first partition, the second partition and the first floating plate of the present invention; Figure 6 for Figure 5Enlarged view of point A in the middle.

[0026] In the figure: 1. tank body; 11. cleaning entrance; 12. dirty oil inlet area; 13. drainage area; 14. storage area; 15. dirty oil inlet; 16. oil discharge port; 17. drainage port; 2. baffle; 21. sealing plate; 22. filter plate; 23. liquid hole; 3. partition one; 31. water inlet; 32. water retaining block; 321. protrusion; 33. rope; 34. slide; 4. floating plate one; 41. retaining ring; 5. floating plate two; 6. partition two; 61. sealing plug; 62. water storage area. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 6 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0028] Example This embodiment provides a waste oil tank with drainage function, such as Figure 1 As shown, it comprises a tank body 1 , on which a cleaning inlet 11 is provided.

[0029] like Figure 2 As shown, the axis direction of the tank body 1 extends in the up-down direction. A baffle 2 is provided inside the tank body 1, and the plate surface of the baffle 2 is perpendicular to the axis of the tank body 1. A partition 3 is provided below the baffle 2, and the plate surface of the baffle 2 is perpendicular to the plate surface of the partition 3. The baffle 2 and the partition 3 divide the waste oil tank into a waste oil inlet area 12, a drainage area 13 and a storage area 14.

[0030] like Figure 2 As shown, the oily wastewater enters the storage area 14 from the oil inlet area 12. After sedimentation and stratification in the storage area 14, the upper layer is the oil layer and the lower layer is the water layer. The water layer flows into the drainage area 13 and is then transported to the sewage treatment equipment, which reduces the possibility of vortexes being easily formed when the drainage pump directly draws the water layer from the lower layer, thereby causing the discharged waste oil to be mixed with the drainage.

[0031] like Figure 2 and Figure 3 As shown, the baffle 2 includes a sealing plate 21 disposed above the drainage area 13 and a filter plate 22 disposed in the storage area 14 , and a liquid passage hole 23 is provided on the filter plate 22 .

[0032] like Figure 2 and Figure 3As shown, a dirty oil inlet 15 is provided on the dirty oil inlet area 12 and above the sealing plate 21, so that the oily wastewater entering from the dirty oil inlet 15 contacts the sealing plate 21 and flows onto the filter plate 22, passes through the liquid holes 23 on the filter plate 22, and then flows into the storage area 14.

[0033] like Figure 2 and Figure 3 As shown, the baffle 2 blocks the oily wastewater entering from the waste oil inlet 15, mitigates the impact of the oily wastewater on the stratified liquid surface, reduces the fluctuation of the liquid surface, thereby reducing the waste oil entering the drainage area 13 and reducing the waste oil mixed in the discharged water.

[0034] like Figure 2 and Figure 3 As shown, the storage area 14 is provided with an oil discharge port 16, and a floating plate 4 is slidably provided in the storage area 14. The floating plate 4 is parallel to the baffle plate 2, and a liquid hole 23 is also provided on the floating plate 4. A retaining ring 41 is provided in the storage area 14 to limit the floating plate 4. The density of the dirty oil is less than that of water, and the density of the floating plate 4 is between the density of the dirty oil and that of water, so that the floating plate 4 can float between the oil layer and the water layer.

[0035] like Figure 5 and Figure 6 As shown, a water inlet 31 is provided at the lower part of the partition 13, so that the water in the storage area 14 flows into the drainage area 13 through the water inlet 31, and a water retaining block 32 capable of blocking the water inlet 31 is connected to the lower part of the floating plate 4 through a rope 33. A chute 34 is provided on the partition 13 at one side of the storage area 14, and two chute 34 are provided and respectively located on both sides of the water inlet 31, and a protrusion 321 that can be stuck in the chute 34 is provided on the water retaining block 32, so that the water retaining block 32 slides along the chute 34.

[0036] like Figure 2 and Figure 6As shown, after the oily sewage is stratified in the storage area 14, the floating plate 4 drives the water retaining block 32 to move upward, and the water layer located in the lower layer flows into the drainage area 13 from the water inlet 31 and is discharged, which reduces the possibility that the drainage pump directly extracts the water layer in the lower layer and easily forms a vortex, causing the dirty oil to be mixed and discharged while the drainage is discharged; and because the floating plate 4 can float between the water layer and the oil layer, the bottom of the floating plate 4 is the water layer, the water inlet 31 is located below the floating plate 4, and the water layer flows into the drainage area 13 from the water inlet 31. In addition, the floating plate 4 drives the water retaining block 32 to move upward, and the water retaining block 32 increases the counterweight of the floating plate 4, so that the floating plate 4 delays its upward movement, which can reduce the amount of dirty oil entering the lower water layer after stratification, and can also reduce the situation where the oily sewage that enters directly into the bottom of the floating plate 4 before stratification, thereby reducing the dirty oil flowing into the drainage area 13 from the water inlet 31 and reducing the dirty oil mixed in the water discharged from the drainage area 13. The floating plate 4 and the baffle plate 2 block the oily wastewater entering from the waste oil inlet 15 twice, which reduces the impact of the oily wastewater on the stratified liquid surface and reduces the fluctuation of the liquid surface, thereby reducing the waste oil entering the drainage area 13 from the water inlet 31 and reducing the waste oil mixed in the water discharged from the drainage area 13, which is beneficial to improving the initial treatment effect of the oily wastewater.

[0037] like Figure 3 As shown, the drainage area 13 is provided with a drainage port 17, and a partition 2 6 parallel to the partition 1 3 is provided in the drainage area 13, and a water storage area 62 is left between the partition 2 6 and the partition 1 3, and the height of the partition 2 6 is less than the height of the partition 1 3, so that the water flowing through the water inlet 31 can enter the water storage area 62 from the top of the partition 1 3 and enter the drainage area 13, and then be discharged from the drainage port 17. The height of the oil discharge port 16 is higher than that of the partition 2 6. When the drainage port 17 is pumped with a water pump, the water storage area 62 between the partition 2 6 and the partition 1 3 can reduce the fluctuation of the water surface at the water inlet 31.

[0038] like Figure 3 As shown, a floating plate 2 5 is slidably provided on the baffle 2, and a liquid hole 23 is also provided on the floating plate 2 5. The density of the floating plate 2 5 is equal to that of the floating plate 1 4. When there are more dirty oil and water stored in the storage area 14, the floating plate 1 4 moves to contact the lower end surface of the baffle 2, and the oily sewage continues to be added, which can push the floating plate 2 5 to move upward. The floating plate 2 5 floats between the water layer and the oil layer, slowing down the impact of the newly added oily sewage on the already stratified liquid surface and reducing the fluctuation of the liquid surface.

[0039] like Figure 3 As shown, both the floating plate 1 4 and the floating plate 2 5 are in contact with the inner wall of the tank body 1 . As the floating plate 1 4 and the floating plate 2 5 slide up and down, the edges of the floating plate 1 4 and the floating plate 2 5 can scrape off the dirty oil on the inner wall of the tank body 1 , which helps to reduce the subsequent cleaning work on the inside of the tank body 1 .

[0040] like Figure 3 and Figure 4 As shown, a drainage hole is provided below the partition plate 6, and a sealing plug 61 is provided in the drainage hole. When the dirty oil tank needs to be cleaned, a person manually enters the dirty oil tank, removes the sealing plug 61, and the water in the water storage area 62 flows into the drainage area 13, flushes the drainage area 13, and is discharged from the drainage port 17.

[0041] A method for using a waste oil tank with a drainage function comprises the following steps: Step 1: The oily wastewater enters the waste oil inlet 15 into the waste oil inlet area 12, enters the storage area 14 through the floating plate 25 and the filter plate 22, and then falls into the lower part of the storage area 14 through the floating plate 14. After the oily wastewater is settled and stratified in the storage area 14, the upper layer is the oil layer and the lower layer is the water layer. Since the density of the floating plate 14 is between the density of the waste oil and the density of water, the floating plate 14 can float between the oil layer and the water layer. Step 2: With the continuous input of oily wastewater, the floating plate 14 drives the water retaining block 32 to gradually rise. After the water retaining block 32 rises, it loses its blockage of the water inlet 31, and the water inlet 31 opens. The water under the floating plate 14 enters the water storage area 62 through the water inlet 31. Step 3: Water continues to flow into the water storage area 62. When the water level is higher than the height of the baffle 2 6, water reaches the drainage area 13 from above the baffle 2 6. The floating plate 1 4 moves to contact the lower end surface of the baffle 2. The oily wastewater continues to flow in, which can push the floating plate 2 5 upward, and the floating plate 2 5 floats between the water layer and the oil layer. Step 4: When draining, the water in the drainage area 13 is discharged from the drainage port 17 by the drainage pump and then transported to the sewage treatment equipment. The upper oil layer is discharged through the oil discharge port 16. When cleaning, manually enter the waste oil tank, pull out the sealing plug 61, and the water in the water storage area 62 flows into the drainage area 13, flushes the drainage area 13, and is discharged from the drainage port 17.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A waste oil tank with drainage function, comprising a tank body (1), the tank body (1) having a waste oil inlet (15), an oil discharge port (16) and a water discharge port (17), characterized in that: A baffle (2) is provided in the tank body (1), and a partition plate (3) is provided below the baffle plate (2). The baffle plate (2) and the partition plate (3) divide the waste oil tank into a waste oil inlet area (12), a drainage area (13), and a storage area (14); the waste oil inlet (15) is located in the waste oil inlet area (12), the oil drainage port (16) is located in the storage area (14), and the drainage port (17) is located in the drainage area (13); A water inlet (31) is provided at the lower portion of the partition plate (3) so that water in the storage area (14) flows into the drainage area (13) through the water inlet (31); a floating plate (4) is slidably provided in the storage area (14); a water retaining block (32) capable of blocking the water inlet (31) is connected to the lower portion of the floating plate (4) via a rope (33); The baffle (2) comprises a sealing plate (21) arranged above the drainage area (13) and a filter plate (22) arranged in the storage area (14). The filter plate (22) and the first floating plate (4) are both provided with liquid holes (23). The density of the waste oil is less than that of water. The density of the first floating plate (4) is between the density of the waste oil and that of water, so that the first floating plate (4) can float between the oil layer and the water layer.

2. The waste oil tank with drainage function according to claim 1, characterized in that: A partition plate 2 (6) parallel to the partition plate 1 (3) is provided in the drainage area (13), a water storage area (62) is left between the partition plate 2 (6) and the partition plate 1 (3), and the height of the partition plate 2 (6) is less than the height of the partition plate 1 (3), so that water flowing through the water inlet (31) and entering the water storage area (62) can enter the drainage area (13) from above the partition plate 1 (3) and be discharged from the drainage outlet (17).

3. The waste oil tank with drainage function according to claim 1, characterized in that: A slide groove (34) is provided on one side of the partition plate (3) located at the storage area (14), two slide grooves (34) are provided and are respectively located on both sides of the water inlet (31), and a protrusion (321) that can be stuck in the slide groove (34) is provided on the water retaining block (32) so that the water retaining block (32) slides along the slide groove (34).

4. The waste oil tank with drainage function according to claim 1, characterized in that: The dirty oil inlet (15) is arranged at a position above the sealing plate (21) so that the oily wastewater entering from the dirty oil inlet (15) contacts the sealing plate (21) and then flows onto the filter plate (22), and then flows into the storage area (14).

5. The waste oil tank with drainage function according to claim 4, characterized in that: A second floating plate (5) is slidably disposed on the baffle (2), and a liquid-passing hole (23) is also disposed on the second floating plate (5). The density of the second floating plate (5) is equal to that of the first floating plate (4).

6. The waste oil tank with drainage function according to claim 5, characterized in that: The first floating plate (4) and the second floating plate (5) are both in contact with the inner wall of the tank body (1), and the first floating plate (4) and the second floating plate (5) can scrape the dirty oil suspended on the inner wall by sliding up and down.

7. The waste oil tank with drainage function according to claim 1, characterized in that: A retaining ring (41) capable of limiting the position of the floating plate 1 (4) is provided in the storage area (14).

8. The waste oil tank with drainage function according to claim 2, characterized in that: A drainage hole is provided below the second partition plate (6), and a sealing plug (61) is provided in the drainage hole.

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