Slag scraping treatment air flotation machine

Abstract

The present invention provides a slag scraping treatment air floatation machine, and relates to an air floatation machine structure, the slag scraping treatment air floatation machine comprises an air floatation tank, a barb-shaped partition plate is arranged in the air floatation tank, the barb-shaped partition plate and the side wall of the air floatation tank are combined to form an independent barb groove, and layered clear water enters a clear water area through a passing port formed between the outer wall of the barb-shaped partition plate and the inner wall of the air floatation tank. A height-adjustable water jacket group is arranged in the clear water area, a liquid level sensor is mounted at the top of the air floatation tank, the liquid level sensor and the water jacket group are electrically connected with a controller, and when the layering of scum and clear water is formed in the air floatation tank and the liquid level sensor detects that the liquid level height in the air floatation tank is b, the whole machine starts continuous cycle operation; through linkage of the water level sensor, the water jacket set and the controller, the water level can be detected and fed back in time, the water jacket set is used for replacing the water outlet weir plate, the water outlet sealing performance can be improved, and therefore all-weather unmanned operation can be achieved.

Description

Technical Field

[0001] The present invention relates to a structure of a dissolved air flotation machine, in particular to a dissolved air flotation machine for scum scraping treatment. Background Art

[0002] When in use, the dissolved air flotation machine injects tiny bubbles into sewage, enabling suspended particles to adhere to the surface of the bubbles to form a flotation body, which floats to the water surface to form a scum layer. The scum is regularly scraped into a slag discharge tank by a scum scraper to prevent the accumulation of scum from affecting the flotation effect.

[0003] When the water inflow of the dissolved air flotation machine is stable, the water level in the tank does not change, and the scum scraper can work normally. However, when the water inflow increases or decreases, if the water at the rear outlet cannot flow out in time or the water flow rate is too large, it will cause the water level to rise or fall. In the prior art, generally, the water discharge amount is controlled by adjusting the height of the outlet weir plate. Workers need to observe the water level change and then manually adjust the weir plate. However, the manual observation of the water level and the feedback have hysteresis. If the water level change is not detected for a long time, it will affect the skimming of the scum by the dissolved air flotation scum scraper. If the scum cannot be removed in time and the scum re-mixes into the water, it will affect the water quality of the effluent. Moreover, the outlet weir plate may not have good sealing due to reasons such as the unevenness, excessive length, and excessive width of the tank wall, resulting in water leakage. The actual water discharge amount does not match the theoretical water discharge amount, which will also affect the difficulty of adjustment. Summary of the Invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a dissolved air flotation machine for scum scraping treatment. Through the linkage of a water level sensor, a water jacket group, and a controller, not only can the water level be detected and fed back in time, but also the water jacket group is used to replace the outlet weir plate, which can improve the sealing of the effluent, thereby realizing unattended operation all day long.

[0005] The present invention provides the following technical solutions:

[0006] A scum scraping and treating air flotation machine includes an air flotation tank. A releaser installed at the bottom of the air flotation tank is used to produce microbubbles to mix with the incoming sewage to form a stratification of scum and clear water. An inverted hook-shaped partition is provided in the air flotation tank. The inverted hook-shaped partition and the side wall of the air flotation tank form an independent inverted hook groove. The scum floating up after stratification enters the inverted hook groove from the notch at the top of the inverted hook groove and is discharged through a slag discharge port opened on the side wall of the air flotation tank. The stratified clear water enters the clear water area through a through port formed between the outer wall of the inverted hook-shaped partition and the inner wall of the air flotation tank. An adjustable-height water jacket group is arranged in the clear water area. A liquid level sensor is installed at the top of the air flotation tank. The liquid level sensor, the water jacket group and the controller are electrically connected. When a stratification of scum and clear water is formed in the air flotation tank and the liquid level sensor detects that the liquid level height in the air flotation tank is b, the value of b is also the height of the notch of the inverted hook groove. Then the whole machine starts continuous cyclic operation. When the liquid inlet is continuously feeding liquid and the releaser is continuously forming the stratification of scum and clear water, the stratified scum is driven by a scum scraper and discharged into the inverted hook groove from the notch. And when the liquid level height detected by the liquid level sensor is a, a = b + H, the controller is triggered to start the water jacket group to lower the height. And when it is detected that the liquid level drops to b, the controller is triggered to start the water jacket group to return to the original position before lowering. And when the liquid level height detected by the liquid level sensor is c, c = b - H, the controller is triggered to start the water jacket group to raise the height. And when it is detected that the liquid level drops to b, the controller is triggered to start the water jacket group to return to the original position before raising.

[0007] Thus, the water level control system of this air flotation machine can realize the all-weather unattended continuous operation of the equipment, and the control is more accurate, greatly reducing the labor of personnel observation.

[0008] Preferably, the water jacket group includes an upper connecting sleeve and a lower connecting sleeve. The upper connecting sleeve is installed by inserting into a rectangular-section inserting rod driven by a motor through an inserting sleeve. The bottom end of the lower connecting sleeve is fixed at the bottom of the clear water area and is communicated with the water outlet at the bottom. An external thread ring is provided outside the upper connecting sleeve. An internal thread ring that is threadedly connected to the external thread ring is provided inside the upper connecting sleeve. And O-rings are arranged at the top and bottom of both the internal thread ring and the external thread ring. Thus, when threading, as long as the upper connecting sleeve and the lower connecting sleeve do not become disengaged during the thread rotation, it can be ensured that there are always at least two groups of O-rings to achieve sealing isolation, so as to ensure continuous working water output while also improving the sealing performance. And when the motor drives the inserting rod to rotate, the inserting sleeve rotates under the drive of the inserting rod because it is inserted and connected to the rectangular-section inserting rod. Therefore, the upper connecting sleeve can be driven to rotate, and at the same time, when the upper connecting sleeve moves up and down, it can also move up and down along the inserting rod. The structure is simple and the adjustment is relatively flexible and convenient.

[0009] Preferably, when the liquid level height is b, the height of the top notch of the upper connecting sleeve should be slightly higher than c and less than the height of b, so as to ensure that the liquid level in the flotation tank can be maintained within a reasonable range, enabling the scum to be effectively scraped and flow into the scum tank. During actual operation, when the liquid level is slightly higher than the notch of the scum tank, the scum accumulates on the liquid surface. However, due to the small liquid level difference or no obvious liquid level drop, the scum just floats on the liquid surface. Without the drive of the scum scraper, the scum cannot effectively enter the scum tank, resulting in the accumulation of scum in the flotation tank. When the height of the clear water is slightly higher than the upper connecting sleeve, the clear water can flow out from the water outlet, thus ensuring that the liquid level can always be maintained in a dynamic balance, and at the same time, it can also ensure that the clear water does not enter the scum tank.

[0010] Preferably, there is a height difference between the bottom of the clear water area and the bottom of the flotation tank, and the through-port formed between the outer wall of the barbed partition plate and the inner wall of the flotation tank is an inclined plane channel that slopes upward from the flotation tank to the clear water area. Thus, it can be ensured that if there are impurities at the bottom of the flotation tank, the probability of the impurities being washed into the clear water area can be reduced.

[0011] Preferably, there is a raised height difference between the horizontal bottom surface of the flotation tank and the bottom of the inclined plane channel, and the height of the inclined plane channel is higher than the horizontal bottom surface of the flotation tank. That is, if there are impurities mixed at the bottom of the flotation tank, after the impurities settle along the inclined plane, it can also prevent the blockage of the channel opening.

[0012] Preferably, a partition plate is also arranged in the flotation tank at intervals between the release device and the barbed groove to prevent the scum stratified by the release device from directly entering the clear water area through the channel opening.

[0013] Preferably, the scum scraper includes a conveyor belt erected on the top of the flotation tank and multiple groups of scrapers arranged in sequence and extending along one side of the conveyor belt. When the multiple groups of scrapers rotate to the bottom side of the conveyor belt, the inclined plane where the ends of the multiple groups of scrapers are located slopes downward from the barbed groove to the side of the partition plate. The liquid level height where the shortest scraper at the top of the inclined plane extends is b, and the liquid level height where the longest scraper at the bottom of the inclined plane extends is c. Thus, when the scrapers rotate into the flotation tank in sequence, the scum can be pushed towards the barbed groove in a cycle from shallow to deep, thereby improving the discharge efficiency of the scum. And when the longest scraper rotates to the end of the conveyor belt and rotates around the conveyor belt, it is used to push the scum scraped once to the notch of the barbed groove, that is, when it rotates to be able to abut against the end of the notch to complete the final slag discharge.

[0014] Preferably, the value of H is set to any value between 5 - 15 mm. The determination of this height value can ensure that the scum smoothly enters the scum tank under the action of the scum scraper. At the same time, it can also avoid the adverse effects on the flotation machine caused by too high or too low liquid level, such as the decline of treatment effect, etc., so as to maintain the stable operation of the equipment and improve the treatment efficiency of the flotation machine.

[0015] The beneficial effects of the present invention are as follows:

[0016] A slag scraping treatment air flotation machine provided by the present invention, through the linkage of a water level sensor, a water jacket group and a controller, can not only detect and feedback the water level in a timely manner, but also replace the effluent weir plate with the water jacket group, which can improve the sealing performance of the effluent, so that it can achieve unattended operation all day long; that is, during actual continuous operation, the water level can be detected in real time by the water level sensor, the controller links the motor, the motor rotates to adjust the height of the water jacket group, the air flotation equipment starts to intake water, when the water level reaches point b, the whole machine starts continuous operation, the liquid level controller turns on the automatic working state, after the water intake volume changes and causes the liquid level to change, when the water level reaches point a, the motor works to drive the water jacket group to rotate down one circle, this process is detected every 30 s until the water level drops to point b; when the water level reaches point c, the motor works to drive the water jacket group to rotate up one circle, this process is detected every 30 s until the water level rises to point b.

[0017] In the present invention, slag scraping treatment is the key link for the air flotation machine to achieve solid-liquid separation. The core equipment, the slag scraper, removes the floating slag from the surface of the air flotation tank through physical means. The slag scraper can directly affect the effluent water quality and the operation efficiency of the equipment. By arranging multiple groups of scrapers that extend in sequence in a rotating manner, when the scrapers rotate into the air flotation tank in sequence, the floating slag can be pushed towards the barb groove in a cycle from shallow to deep, so as to improve the discharge efficiency of the floating slag. And when the longest scraper rotates to the end of the conveyor belt, when it rotates around the conveyor belt, it is used to push the floating slag scraped for the first time to the notch of the barb groove, that is, when it rotates to be able to abut against the end of the notch to complete the final slag discharge. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0019] Figure 1 is the structural schematic diagram of the present invention;

[0020] Figure 2 is the top view of the upper connecting sleeve;

[0021] Figure 3 is the connection schematic diagram of the upper connecting sleeve and the lower connecting sleeve;

[0022] Markings in the drawings:

[0023] 1, air flotation tank; 2, releaser; 3, barb groove; 4, through port; 5, water jacket group; 6, clear water area; 7, liquid level sensor; 8, slag scraper; 9, controller; 10, partition plate; 51, upper connecting sleeve; 52, lower connecting sleeve; 53, motor; 54, insertion rod; 55, insertion sleeve; 81, conveyor belt; 82, scraper. Detailed implementation mode

[0024] Example 1

[0025] As shown in Figures 1-3 the figure, a scum scraping treatment air flotation machine, in this embodiment, includes an air flotation tank 1. A releaser 2 installed at the bottom of the air flotation tank 1 is used to produce microbubbles to mix with the incoming sewage to form a layer separation of scum and clear water. An inverted hook-shaped partition is provided in the air flotation tank 1. The inverted hook-shaped partition and the side wall of the air flotation tank 1 form an independent inverted hook groove 3. The scum floating up after layer separation enters the inverted hook groove 3 from the notch at the top of the inverted hook groove 3 and is discharged through a slag discharge port opened on the side wall of the air flotation tank 1. The separated clear water enters the clear water area 6 through a through port 4 formed between the outer wall of the inverted hook-shaped partition and the inner wall of the air flotation tank 1. An adjustable-height water jacket group 5 is arranged in the clear water area 6. A liquid level sensor 7 is installed on the top of the air flotation tank 1. The liquid level sensor 7, the water jacket group 5 and the controller 9 are electrically connected. When a layer separation of scum and clear water is formed in the air flotation tank 1 and the liquid level sensor 7 detects that the liquid level height in the air flotation tank 1 is b (the liquid level here is the liquid level above the scum layer), the value of b is also the height of the notch of the inverted hook groove 3. Then the whole machine starts continuous cyclic operation. When the liquid inlet is continuously feeding liquid and the releaser 2 is continuously forming a layer separation of scum and clear water, the separated scum is driven by the scum scraper 8 to enter the inverted hook groove 3 from the notch. And when the liquid level height detected by the liquid level sensor 7 is a, a = b + H, then it triggers the controller 9 to start the water jacket group 5 to lower the height. And when it is detected that the liquid level drops to b, it triggers the controller 9 to start the water jacket group 5 to return to the original position before lowering. And when the liquid level height detected by the liquid level sensor 7 is c, c = b - H, then it triggers the controller 9 to start the water jacket group 5 to raise the height. And when it is detected that the liquid level drops to b, it triggers the controller 9 to start the water jacket group 5 to return to the original position before raising,

[0026] Thus, the water level control system of this air flotation machine can realize the all-weather unmanned continuous operation of the equipment, and the control is more accurate, greatly reducing the labor of personnel observation.

[0027] Example 2

[0028] A slag scraping and treating air flotation machine. In this embodiment, it is a further limitation based on Embodiment 1. The water jacket group 5 includes an upper connecting sleeve 51 and a lower connecting sleeve 52. The upper connecting sleeve 51 is inserted and installed with a rectangular cross-section inserting rod 54 driven by a motor 53 through an inserting sleeve 55. The bottom end of the lower connecting sleeve 52 is fixed at the bottom of the clear water area 6 and is communicated with the water outlet at the bottom. An external thread ring is provided outside the upper connecting sleeve 51, and an internal thread ring threadedly connected to the external thread ring is provided inside the upper connecting sleeve 51. And O-rings are provided at the top and bottom ends of the internal thread ring and the external thread ring. Thus, when threadedly connecting, when the upper connecting sleeve 51 and the lower connecting sleeve 52 rotate in threads, as long as they do not become disengaged, it can be ensured that there are always at least two groups of O-rings to achieve sealing isolation, so as to ensure continuous working water output while also improving the sealing performance. And when the motor 53 drives the inserting rod 54 to rotate, since the inserting sleeve 55 is inserted and connected with the rectangular cross-section inserting rod 54, therefore, it can rotate under the drive of the inserting rod 54 to drive the upper connecting sleeve 51 to rotate. At the same time, when the upper connecting sleeve 51 moves up and down, it can also move up and down along the inserting rod 54. The structure is simple and the adjustment is relatively flexible and convenient.

[0029] When the liquid level height is b, the height of the top notch of the upper connecting sleeve 51 should be slightly higher than c and less than the height of b, so as to ensure that the liquid level in the air flotation tank 1 can be kept within a relatively reasonable range, so that it can be ensured that the floating slag is effectively scraped and flows into the slag tank. In the actual operation process, when the liquid level is slightly higher than the notch of the slag tank, the floating slag accumulates on the liquid surface. However, due to the small liquid level difference or no obvious liquid level drop, the floating slag just floats on the liquid surface. Without the drive of the slag scraping machine 8, the floating slag cannot effectively enter the slag tank, resulting in the accumulation of floating slag in the air flotation tank 1. And when the height of the clear water is slightly higher than the upper connecting sleeve 51, the clear water can flow out from the water outlet, so as to ensure that the liquid level can always be kept in a dynamic balance, and at the same time, it can also ensure that the clear water can be prevented from entering the slag tank.

[0030] There is a height difference between the bottom of the clear water area 6 and the bottom of the air flotation tank 1, and the through port 4 formed between the outer wall of the barbed partition plate and the inner wall of the air flotation tank 1 is an inclined inclined plane channel that slopes upward from the air flotation tank 1 to the clear water area 6. Thus, it can be ensured that if there are impurities at the bottom of the air flotation tank 1, the probability of the impurities being washed into the clear water area 6 can be reduced.

[0031] There is a raised height difference between the horizontal bottom surface of the air flotation tank 1 and the bottom of the inclined inclined plane channel, and the height of the inclined inclined plane channel is higher than the horizontal bottom surface of the air flotation tank 1. That is, if there are impurities mixed at the bottom of the air flotation tank 1, after the impurities settle along the inclined plane, it can also avoid the blockage of the channel port.

[0032] A partition plate 10 is also provided in the air flotation tank 1 and spaced between the releaser 2 and the barbed groove 3, so as to prevent the floating slag stratified by the releaser 2 from directly entering the clear water area 6 through the channel port.

[0033] The slag scraper 8 includes a conveyor belt 81 erected on the top of the flotation tank 1 and multiple groups of scrapers 82 arranged in sequence and extending along one side of the conveyor belt 81. When the multiple groups of scrapers 82 rotate to the bottom side of the conveyor belt 81, the inclined surface where the ends of the multiple groups of scrapers 82 are located slopes downward from the barb groove 3 to the partition plate 10 side. The liquid level height where the shortest scraper 82 at the top end of the inclined surface extends into is b, and the liquid level height where the longest scraper 82 at the bottom end of the inclined surface extends into is c. Thus, when the scrapers 82 rotate into the flotation tank 1 in sequence, the floating slag can be advanced towards the barb groove 3 in a cycle from shallow to deep, thereby improving the discharge efficiency of the floating slag. And when the longest scraper 82 rotates to the end of the conveyor belt 81 and rotates around the conveyor belt 81, it is used to push the floating slag scraped for the first time to the notch of the barb groove 3, that is, when it rotates to be able to abut against the end of the notch to complete the final slag discharge.

[0034] Embodiment 3

[0035] A flotation machine for slag scraping treatment. In this embodiment, it is a further limitation based on Embodiment 2. The value of H is set to any value in the range of 5 - 15 mm. The determination of this height value can ensure that the floating slag smoothly enters the slag tank under the action of the slag scraper 8. At the same time, it can also avoid the adverse effects on the flotation machine caused by too high or too low liquid level, such as the decline of treatment effect, etc., so as to maintain the stable operation of the equipment and improve the treatment efficiency of the flotation machine.

[0036] Set b = 50 cm, H = 5 mm, 7 mm, 10 mm, 12 mm, 15 mm to monitor the test data and judge the treatment efficiency (using the COD removal rate and the suspended solid removal rate as the measurement indicators).

[0037]

[0038]

[0039] It can be seen from the experimental data that as the liquid level height increases, both the COD removal rate and the suspended solid removal rate show a trend of first rising and then falling. When the liquid level height difference is 10 mm, both the COD removal rate and the suspended solid removal rate reach the highest values, which are 78% and 85% respectively. According to the experimental data and analysis results, it is recommended to control the liquid level height of the flotation machine at about b = 50 cm and H = 10 mm to improve the treatment efficiency.

[0040] The working principle of the present invention is as follows: A slag scraping treatment air flotation machine provided by the present invention, through the linkage of a water level sensor, a water jacket group 5, and a controller 9, can not only detect and feedback the water level in a timely manner, but also replace the effluent weir plate with the water jacket group 5, which can also improve the sealing performance of the effluent, so as to achieve unattended operation all day long; that is, during actual continuous operation, the water level can be detected in real time by the water level sensor, and the controller 9 drives the motor 53 in linkage. The motor 53 rotates to adjust the height of the water jacket group 5. The air flotation equipment starts to fill with water. When the water level reaches point b, the whole machine starts continuous operation. The liquid level controller 9 turns on the automatic working state. After the water inflow changes and causes the liquid level to change, when the water level reaches point a, the motor 53 works to drive the water jacket group 5 to rotate downward by one circle. This process is detected every 30 seconds until the water level drops to point b; when the water level reaches point c, the motor 53 works to drive the water jacket group 5 to rotate upward by one circle. This process is detected every 30 seconds until the water level rises to point b.

[0041] In the present invention, slag scraping treatment is the key link for the air flotation machine to achieve solid-liquid separation. The core equipment, the slag scraper 8, removes the floating slag from the surface of the air flotation tank 1 through a physical method. The slag scraper 8 can directly affect the effluent water quality and the operation efficiency of the equipment. By rotating a plurality of sets of scrapers 82 arranged in sequence, when the scrapers 82 rotate into the air flotation tank 1 in sequence, the floating slag can complete a cycle of advancing from shallow to deep towards the barb groove 3, so as to improve the discharge efficiency of the floating slag. And when the longest scraper 82 rotates to the end of the conveyor belt 81, when it rotates around the conveyor belt 81, it is used to push the floating slag scraped for the first time to the notch of the barb groove 3, that is, when it rotates to be able to abut against the end of the notch to complete the final slag discharge.

[0042] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A slag scraping and treating air flotation machine, including an air flotation tank, wherein a releaser installed at the bottom of the air flotation tank is used to produce microbubbles to mix with the incoming sewage to form a layer separation of scum and clear water, characterized in that, A barb-shaped partition is provided in the flotation tank. The barb-shaped partition and the side wall of the flotation tank form an independent barb groove. The scum floating up after stratification enters the barb groove from the notch at the top of the barb groove and is discharged through the slag discharge port opened on the side wall of the flotation tank. The clarified water after stratification enters the clarified water area through the through port formed between the outer wall of the barb-shaped partition and the inner wall of the flotation tank. An adjustable-height water jacket group is arranged in the clarified water area. A liquid level sensor is installed on the top of the flotation tank. The liquid level sensor, the water jacket group and the controller are electrically connected. When stratification of scum and clarified water is formed in the flotation tank and the liquid level sensor detects that the liquid level height in the flotation tank is b, the value of b is also the height of the notch of the barb groove. Then the whole machine starts continuous cyclic operation. When the liquid inlet is continuously feeding liquid and the releaser is continuously forming stratification of scum and clarified water, the stratified scum is driven by the slag scraping machine and discharged into the barb groove from the notch. When the liquid level height detected by the liquid level sensor is a and a = b + H, the controller is triggered to start the water jacket group to lower the height. When it is detected that the liquid level drops to b, the controller is triggered to start the water jacket group to return to the original position before lowering. When the liquid level height detected by the liquid level sensor is c and c = b - H, the controller is triggered to start the water jacket group to raise the height. When it is detected that the liquid level drops to b, the controller is triggered to start the water jacket group to return to the original position before raising.

2. The flotation machine for slag scraping treatment according to claim 1, wherein The water jacket group includes an upper connecting sleeve and a lower connecting sleeve. The upper connecting sleeve is inserted and installed with a rectangular-section inserting rod driven by a motor through an inserting sleeve. The bottom end of the lower connecting sleeve is fixed at the bottom of the clarified water area and is communicated with the water outlet at the bottom. An external thread ring is provided outside the upper connecting sleeve. An internal thread ring threadedly connected with the external thread ring is provided inside the upper connecting sleeve. And O-rings are arranged at the top and bottom ends of the internal thread ring and the external thread ring.

3. The flotation machine for slag scraping treatment according to claim 2, characterized in that, When the liquid level height is b, the notch height at the top of the upper connecting sleeve should be slightly higher than c and less than the height of b.

4. A slag scraping and treating air flotation machine according to claim 1, characterized in that, There is a height difference between the bottom of the clarified water area and the bottom of the flotation tank. And the through port formed between the outer wall of the barb-shaped partition and the inner wall of the flotation tank is an inclined slope channel inclined upward from the flotation tank to the clarified water area.

5. The flotation machine for slag scraping treatment according to claim 1, wherein There is a raised height difference between the horizontal bottom surface of the flotation tank and the bottom of the inclined slope channel. And the height of the inclined slope channel is higher than the horizontal bottom surface of the flotation tank.

6. The flotation machine for slag scraping treatment according to claim 1, wherein A partition board is also arranged in the flotation tank at intervals between the releaser and the barb groove.

7. The flotation machine for slag scraping treatment according to claim 6, characterized in that The slag scraping machine includes a conveyor belt erected on the top of the flotation tank and multiple groups of scrapers arranged in sequence and extending on one side of the conveyor belt. When the multiple groups of scrapers rotate to the bottom side of the conveyor belt, the inclined surface where the ends of the multiple groups of scrapers are located is inclined downward from the barb groove to the partition board side. And the liquid level height where the shortest scraper at the top end of the inclined surface extends is b, and the liquid level height where the longest scraper at the bottom end of the inclined surface extends is c. When the longest scraper rotates to the end of the conveyor belt and rotates around the conveyor belt, it is used to push the scum scraped and discharged once to the notch of the barb groove.

8. A dross scraping and treating air flotation machine according to any one of claims 1-7, characterized in that, The value of H is set to any value in the range of 5 - 15 mm.

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