A flotation machine for treating oily wastewater

Abstract

The present invention belongs to the technical field of sewage treatment, and specifically discloses an air flotation machine for treating oily sewage, including an air flotation machine housing, in which a front baffle, a front oil collecting plate and a rear oil collecting plate are arranged from left to right in sequence, and the front baffle, the front oil collecting plate and the rear oil collecting plate divide the air flotation machine housing into a mixing pool, an air flotation pool, an oil collecting pool and a slag collecting pool in sequence from left to right, a slag scraping assembly is arranged on the upper side of the air flotation pool of the air flotation machine housing, a rotating filter plate is arranged in the upper part of the oil collecting pool, and running tracks are arranged on the upper walls of the two symmetrical side walls of the air flotation machine housing, and multi-stage track grooves are arranged on the inner side walls of the air flotation machine housing and the inner side walls of the running track, and the multi-stage track grooves include slag scraping track grooves, slag scooping track grooves and oil filtering track grooves. The present invention utilizes an adjusting baffle to move along the slag scraping track groove, the slag scooping track groove and the oil filtering track groove, and divides the walking path of the adjusting baffle into a slag scraping stage, a slag scooping stage and an oil filtering stage, so as to automatically realize the classified collection of floating slag and oil.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and specifically refers to an air flotation machine for treating oily sewage. Background Art

[0002] Dissolved air flotation technology is a solid-liquid separation technology. It has the characteristics of high treatment efficiency, short start-up time and small footprint, and is widely used in the field of water treatment. The complete dissolved air flotation technology includes three basic processes: flocculation process, dissolved air release process and bubble-floc aggregate formation and separation process. Therefore, the tank body of the general flotation machine includes a flocculation reaction tank, a mixing tank and an air flotation tank. The sewage first enters the flocculation reaction tank and is fully mixed with the flocculant to undergo a flocculation reaction, and then enters the mixing tank to complete the bonding with the small bubbles in the dissolved air water to form a foam floc. It enters the air flotation tank along the guide inclined plate set between the mixing tank and the air flotation tank and floats to the liquid surface to form scum for removal.

[0003] When the scum is separated, the existing scraper device brings the scum into the sludge pool. The sizes of the partition between the existing separation pool and the sludge pool and the scraper plate of the scraper device are fixed. When the amount of sewage is small, the sewage is far below the height of the partition, and the scraper plate of the scraper device cannot contact the sewage. The amount of impurities in the sewage is uncertain. When the amount of impurities is small, the thickness of the generated scum is small, and the scraper plate cannot contact the scum. When the thickness of the generated scum is large, the scraper plate cannot be cleaned quickly, resulting in scum accumulation. In addition, under the thrust of the scraper plate, the sludge and oil in the scum are pushed into the sludge pool together, and the sludge and oil need to be separated again, which increases the cost of sewage treatment.

[0004] Therefore, an air flotation machine for treating oily wastewater is needed to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an air flotation machine for treating oily wastewater, wherein the adjusting baffle moves along the scraping track groove, the slag scooping track groove and the oil filtering track groove, and the walking path of the adjusting baffle is divided into the scraping stage, the slag scooping stage and the oil filtering stage, thereby automatically realizing the classified collection of floating slag and oil.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes an air flotation machine for treating oily wastewater, including an air flotation machine housing, in which a guide ramp, a front oil collecting plate and a rear oil collecting plate are arranged from left to right in sequence, and the guide ramp, the front oil collecting plate and the rear oil collecting plate divide the air flotation machine housing into a mixing tank, an air flotation tank, an oil collecting tank and a slag collecting tank in sequence from left to right, a slag scraping assembly is arranged on the upper side of the air flotation tank of the air flotation machine housing, a rotating filter plate is arranged on the upper inner part of the oil collecting tank, the upper walls of the two symmetrical side walls of the air flotation machine housing are provided with running tracks, the inner side walls of the air flotation machine housing and the inner side walls of the running tracks are provided with multi-stage track grooves, the multi-stage track grooves include slag scraping track grooves, slag scooping track grooves and oil filtering track grooves, and the slag scraping track grooves, slag scooping track grooves and oil filtering track grooves are connected end to end in sequence to form a closed loop.

[0007] Furthermore, the upper ends of the front oil collecting plate and the rear oil collecting plate are both arc-shaped, and the two arcs form a filter chamber. A rotating filter plate is provided in the filter chamber, and both ends of the rotating filter plate are arranged on the inner wall of the flotation machine case through an axis rotation. Limiting strips are respectively provided at the junction of the arc section and the vertical section of the front oil collecting plate and the rear oil collecting plate.

[0008] Furthermore, a slag collecting inclined plate is provided at the upper end of the front oil collecting plate, the slag collecting inclined plate is inclined downward, a supporting inclined plate is provided at the end of the slag collecting inclined plate, and the other end of the supporting inclined plate is provided on the side wall of the front oil collecting plate.

[0009] Furthermore, the slag scooping track trough includes a descending section and an ascending section, the terminal end of the descending section of the slag scooping track trough is aligned with the lower end of the slag collecting inclined plate, the terminal end of the ascending section of the slag scooping track trough is aligned with the high end of the slag collecting inclined plate, and the ascending section of the slag scooping track trough is parallel to the slag collecting inclined plate.

[0010] Furthermore, the oil filter track groove is aligned with the oil collecting pool up and down, and the oil filter track groove includes a descending section, a horizontal section, an ascending section and a merging section. The starting end of the descending section of the oil filter track groove is connected to the terminal end of the slag scraping track groove, the terminal end of the ascending section of the oil filter track groove is aligned with the upper end of the rear oil collecting plate, and the terminal end of the merging end of the oil filter track groove is connected to the end of the slag scraping track groove.

[0011] Furthermore, the scraping track groove is of a runway type, and the lower side of the scraping track groove is disconnected.

[0012] Furthermore, the scraper assembly includes a mounting frame, a mounting shaft, a sprocket, a chain, an adjustable scraper and a scraper motor, the mounting frames are symmetrically arranged in pairs on the outer side walls of the flotation machine case, the mounting shaft is arranged between two opposite mounting frames, the sprocket is arranged at both ends of the mounting shaft, the chain is arranged on the sprocket, the scraper motor is arranged on the mounting frame, the scraper motor is connected to one of the mounting shafts, and the adjustable scraper array is arranged between the chains.

[0013] Furthermore, the adjustable scraper includes a connecting shaft, a fixed plate, a movable plate, a traveling shaft, a restoring spring and a mesh scraper, the two ends of the fixed plate are fixed on the chain through a connecting shaft, the movable plate is a hollow cavity with an opening at the upper end, the movable plate is slidably arranged on the fixed plate, the restoring spring array is arranged in the movable plate, one end of the restoring spring is arranged on the end surface of the fixed plate, and the other end of the restoring spring is arranged on the inner bottom wall of the movable plate, the edge of the mesh scraper is hinged to the edge of the movable plate through a torsion spring, the traveling shaft is symmetrically arranged on the upper part of the two side walls of the movable plate, and the end of the traveling shaft slides in the scraping track groove, the slag scooping track groove and the oil filter track groove.

[0014] Furthermore, an air dissolving tank is provided on the outer wall of the mixing tank of the air flotation machine housing.

[0015] Furthermore, the running track is arranged in a runway shape, and both ends of the lower side of the running track are disconnected.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows:

[0017] 1. When the travel shaft moves to the slag scoop track groove, the travel shaft enters the descending section of the slag scoop track groove, and the travel shaft drives the movable plate to descend, and the movable plate drives the mesh scraper to descend, and the lower end of the movable plate moves to the lower end of the slag collecting inclined plate. Under the action of the slag collecting inclined plate, the mesh scraper tends to be parallel to the slag collecting inclined plate, and the front end of the mesh scraper is always in contact with the inclined surface of the slag collecting inclined plate. At this time, the angle between the mesh scraper and the movable plate is an acute angle, and the travel shaft enters the ascending section of the slag scoop track groove, and the movable plate pushes the oil and scum to move toward the oil collecting pool. When the travel shaft moves to the high end of the slag scoop track groove, the movable plate and the mesh scraper lift the oil and scum upward, which solves the problem that the existing scraper plate cannot automatically adjust the length according to the height of the sewage, and may cause scraping leakage;

[0018] 2. When the travel shaft enters the descending section of the oil filter track groove, the movable plate is separated from the front oil collecting plate, and the travel shaft drives the movable plate and the mesh scraper to move downward. Under the action of the torsion spring, the angle between the mesh scraper and the movable plate is an obtuse angle, and the oil and scum fall onto the rotating filter plate;

[0019] 3. At this time, the mesh scraper first contacts the rotating filter plate and pushes the rotating filter plate downward. The rotating filter plate rotates counterclockwise, and the mesh scraper moves along the rotating filter plate. When it moves to the rotating point of the rotating filter plate, the mesh scraper pushes the rotating filter plate to rotate clockwise under the action of the torsion spring. When the travel shaft moves to the rising section of the oil filter track groove, the mesh scraper presses against the arc of the rear oil collecting plate, and the movable plate moves forward and upward at the same time. The angle between the mesh scraper and the rear oil collecting plate decreases. At the same time, the mesh scraper moves upward driven by the movable plate to squeeze the scum and oil. The oil in the scum is filtered out from the mesh scraper and falls into the oil collecting pool.

[0020] 4. When the travel shaft moves to the high end of the rising section of the oil filter track groove, the lower end of the mesh scraper is offset from the rear oil collecting plate. At this time, under the action of the torsion spring, the mesh scraper bounces upward, and the scum falls from the mesh scraper into the scum collecting pool. Then the travel shaft enters the scraper track groove from the merging section of the oil filter track groove, automatically completing the filtering and separation of scum and oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the internal three-dimensional structure of an air flotation machine for treating oily wastewater proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the external three-dimensional structure of an air flotation machine for treating oily wastewater proposed by the present invention;

[0023] Figure 3 for Figure 1 The main view;

[0024] Figure 4 It is a schematic diagram of the positional relationship between the oil collecting pool and the multi-stage track groove;

[0025] Figure 5 It is a schematic diagram of the positional relationship between the front oil collecting plate, the rear oil collecting plate, the slag collecting inclined plate and the supporting inclined plate;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the adjustable scraper;

[0027] Figure 7 It is a schematic diagram of the internal structure of the adjustable scraper;

[0028] Figure 8 for Figure 3 Enlarged view of part A.

[0029] Among them, 1. flotation machine housing, 2. guide inclined plate, 3. front oil collecting plate, 4. rear oil collecting plate, 5. mixing tank, 6. flotation tank, 7. oil collecting tank, 8. slag collecting tank, 9. slag scraping assembly, 10. rotating filter plate, 11. running track, 12. multi-stage track groove, 13. slag scraping track groove, 14. slag scooping track groove, 15. oil filter track groove, 16. filter chamber, 17. limit stop bar, 18. slag collecting inclined plate, 19. supporting inclined plate, 20. mounting frame, 21. mounting shaft, 22. sprocket, 23. chain, 24. adjustable scraper, 25. slag scraping motor, 26. connecting shaft, 27. fixed plate, 28. movable plate, 29. walking shaft, 30. return spring, 31. mesh scraper, 32. dissolved air tank.

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the present invention proposes an air flotation machine for treating oily wastewater, including an air flotation machine housing 1, wherein a guide ramp 2, a front oil collecting plate 3 and a rear oil collecting plate 4 are arranged in the air flotation machine housing 1 from left to right in sequence, wherein the guide ramp 2, the front oil collecting plate 3 and the rear oil collecting plate 4 divide the air flotation machine housing 1 into a mixing pool 5, an air flotation pool 6, an oil collecting pool 7 and a slag collecting pool 8 in sequence from left to right, wherein a slag scraping assembly 9 is arranged on the upper side of the air flotation pool 6 of the air flotation machine housing 1, a rotating filter plate 10 is arranged in the upper part of the oil collecting pool 7, and the air flotation machine housing 1 is provided with a rotating filter plate 10. The upper walls of the two symmetrical side walls of the flotation box 1 are provided with running tracks 11, and the inner wall of the flotation box 1 and the inner wall of the running track 11 are provided with multi-stage track grooves 12, and the multi-stage track grooves 12 include scraping track grooves 13, scraping track grooves 14 and oil filtering track grooves 15. The scraping track grooves 13, the scraping track grooves 14 and the oil filtering track grooves 15 are connected end to end in sequence to form a closed loop. In the mixing tank 5, the dissolved air water generated by the dissolved air tank 32 is released into the mixing tank 5 and is fully mixed with the added sewage.

[0034] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, the upper ends of the front oil collecting plate 3 and the rear oil collecting plate 4 are both arc-shaped, and the two arcs form a filter chamber 16. A rotating filter plate 10 is provided in the filter chamber 16. Both ends of the rotating filter plate 10 are rotatably arranged on the inner side wall of the flotation machine housing 1 through an axis, and limit bars 17 are respectively provided at the junctions of the arc sections and the vertical sections of the front oil collecting plate 3 and the rear oil collecting plate 4.

[0035] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, a slag collecting inclined plate 18 is provided at the upper end of the front oil collecting plate 3 , and the slag collecting inclined plate 18 is inclined downward. A supporting inclined plate 19 is provided at the end of the slag collecting inclined plate 18 , and the other end of the supporting inclined plate 19 is provided on the side wall of the front oil collecting plate 3 .

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, the slag scooping track trough 14 includes a descending section and an ascending section. The terminal end of the descending section of the slag scooping track trough 14 is aligned with the lower end of the slag collecting inclined plate 18, the terminal end of the ascending section of the slag scooping track trough 14 is aligned with the high end of the slag collecting inclined plate 18, and the ascending section of the slag scooping track trough 14 is parallel to the slag collecting inclined plate 18.

[0037] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, the oil filter track groove 15 is aligned with the oil collecting pool 7 up and down, and the oil filter track groove 15 includes a descending section, a horizontal section, an ascending section and an merging section. The starting end of the descending section of the oil filter track groove 15 is connected to the terminal end of the slag scooping track groove 14, the terminal end of the ascending section of the oil filter track groove 15 is aligned with the upper end of the rear oil collecting plate 4, and the terminal end of the merging end of the oil filter track groove 15 is connected to the end of the slag scraping track groove 13.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the scraping track groove 13 is a racetrack type, and the lower side of the scraping track groove 13 is disconnected.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, the scraper assembly 9 includes a mounting frame 20, a mounting shaft 21, a sprocket 22, a chain 23, an adjustable scraper 24 and a scraper motor 25. The mounting frames 20 are symmetrically arranged on the outer wall of the flotation machine housing 1 in pairs, the mounting shaft 21 is arranged between two opposite mounting frames 20, the sprocket 22 is arranged at both ends of the mounting shaft 21, the chain 23 is arranged on the sprocket 22, the scraper motor 25 is arranged on the mounting frame 20, the scraper motor 25 is connected to one of the mounting shafts 21, and the adjustable scraper 24 is arranged in an array between the chains 23.

[0040] like Figure 1 , Figure 2 , Figure 6 , Figure 7 As shown, the adjustable scraper 24 includes a connecting shaft 26, a fixed plate 27, a movable plate 28, a traveling shaft 29, a restoring spring 30 and a mesh scraper 31. Both ends of the fixed plate 27 are fixed on the chain 23 through the connecting shaft 26. The movable plate 28 is a hollow cavity with an upper end opening. The movable plate 28 is slidably arranged on the fixed plate 27. The restoring spring 30 array is arranged in the movable plate 28. One end of the restoring spring 30 is arranged on the end surface of the fixed plate 27, and the other end of the restoring spring 30 is arranged on the inner bottom wall of the movable plate 28. The edge of the mesh scraper 31 is hinged to the edge of the movable plate 28 through a torsion spring. The traveling shaft 29 is symmetrically arranged on the upper part of the two side walls of the movable plate 28. The end of the traveling shaft 29 slides in the scraping track groove 13, the slag scooping track groove 14 and the oil filter track groove 15.

[0041] like Figure 1 , Figure 3 As shown, an outer wall of the mixing pool 5 of the air flotation machine housing 1 is provided with an air dissolving tank 32, and the dissolved air water produced by the air dissolving tank 32 enters the mixing pool 5 through a releaser.

[0042] like Figure 1 , Figure 3 , Figure 4 As shown, the running track 11 is arranged in a runway shape, and both ends of the lower side of the running track 11 are disconnected.

[0043] When in use, the air dissolving tank 32 is opened, and the releaser releases the dissolved air water produced by the air dissolving tank 32 into the mixing tank 5. At the same time, sewage is introduced into the mixing tank 5 by using a sewage pump. The sewage and the dissolved air water are fully mixed. The sewage combined with a large number of bubbles enters the flotation tank 6 along the guide inclined plate 2. The oil and scum in the sewage float with the bubbles. The scraper motor 25 is turned on, and the scraper motor 25 drives the installation shaft 21 to rotate, the installation shaft 21 drives the sprocket 22 to rotate, the sprocket 22 drives the chain 23 to rotate, and the chain 23 drives the adjustable scraper 24 to circulate in the flotation machine housing 1. The mesh scraper 31 drives the oil and scum to move toward the oil collecting tank 7. The walking shaft 29 on the movable plate 28 moves in the scraper track groove 13. When the walking shaft 29 moves to the slag scooping track groove 1 4, the walking shaft 29 enters the descending section of the slag scooping track groove 14, at this time, the walking shaft 29 drives the movable plate 28 to descend, and the movable plate 28 drives the mesh scraper 31 to descend, and the lower end of the movable plate 28 moves to the lower end of the slag collecting inclined plate 18. Under the action of the slag collecting inclined plate 18, the mesh scraper 31 tends to be parallel to the slag collecting inclined plate 18, and the front end of the mesh scraper 31 is always in contact with the inclined surface of the slag collecting inclined plate 18. At this time, the angle between the mesh scraper 31 and the movable plate 28 is an acute angle, and the walking shaft 29 enters the ascending section of the slag scooping track groove 14, and the movable plate 28 pushes the oil and scum to move toward the oil collecting pool 7. When the walking shaft 29 moves to the high end of the slag scooping track groove 14, the movable plate 28 and the mesh scraper 31 lift the oil and scum upwards, and when the walking shaft 29 enters the oil filter The movable plate 28 is separated from the front oil collecting plate 3 by the travel shaft 29, and the movable plate 28 and the mesh scraper 31 are driven downward by the travel shaft 29. Under the action of the torsion spring, the angle between the mesh scraper 31 and the movable plate 28 is an obtuse angle, and the oil and scum fall onto the rotating filter plate 10. At this time, the mesh scraper 31 first contacts the rotating filter plate 10 and pushes the rotating filter plate 10 downward. The rotating filter plate 10 rotates counterclockwise. When the travel shaft 29 moves in the oil filter track groove 15, the mesh scraper 31 moves along the rotating filter plate 10. When it moves to the rotation point of the rotating filter plate 10, under the action of the torsion spring, the mesh scraper 31 pushes the rotating filter plate 10 to rotate clockwise. When the travel shaft 29 moves to the ascending section of the oil filter track groove 15, the mesh scraper 31 presses against the rear collecting plate 10. At the arc-shaped part of the oil plate 4, the movable plate 28 moves forward and upward at the same time, and the angle between the mesh scraper 31 and the rear oil collecting plate 4 decreases. At the same time, the mesh scraper 31 moves upward driven by the movable plate 28 to squeeze the scum and oil. The oil in the scum is filtered out from the mesh scraper 31 and falls into the oil collecting pool 7. When the walking shaft 29 moves to the high end of the ascending section of the oil filter track groove 15, the lower end of the mesh scraper 31 is staggered with the rear oil collecting plate 4. At this time, under the action of the torsion spring, the mesh scraper 31 bounces upward, and the scum falls from the mesh scraper 31 into the scum collecting pool 8. Then the walking shaft 29 enters the scraper track groove 13 from the merging section of the oil filter track groove 15, and automatically completes the filtering and separation of scum and oil. The clean water in the lower layer of the flotation pool 6 flows out through the water collector.A part of the reflux enters the dissolved gas tank 32.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0046] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An air flotation machine for treating oily wastewater, comprising an air flotation machine housing (1), characterized in that: The air flotation machine housing (1) is provided with a guide inclined plate (2), a front oil collecting plate (3) and a rear oil collecting plate (4) from left to right in sequence. The guide inclined plate (2), the front oil collecting plate (3) and the rear oil collecting plate (4) divide the air flotation machine housing (1) into a mixing pool (5), an air flotation pool (6), an oil collecting pool (7) and a slag collecting pool (8) from left to right in sequence. A slag scraping assembly (9) is provided on the upper side of the air flotation pool (6) of the air flotation machine housing (1). A rotating filter plate is provided on the upper part of the oil collecting pool (7). (10), the upper walls of the two symmetrical side walls of the air flotation machine housing (1) are provided with running tracks (11), the inner side walls of the air flotation machine housing (1) and the inner side walls of the running tracks (11) are provided with multi-stage track grooves (12), the multi-stage track grooves (12) include scraping track grooves (13), slag scooping track grooves (14) and oil filtering track grooves (15), the scraping track grooves (13), slag scooping track grooves (14) and oil filtering track grooves (15) are sequentially connected end to end to form a closed loop; The upper ends of the front oil collecting plate (3) and the rear oil collecting plate (4) are both arc-shaped, and the two arcs form a filter chamber (16). A rotating filter plate (10) is provided in the filter chamber (16). Both ends of the rotating filter plate (10) are rotatably arranged on the inner side wall of the air flotation machine housing (1) via an axis. Limiting bars (17) are respectively provided at the junction of the arc-shaped section and the vertical section of the front oil collecting plate (3) and the rear oil collecting plate (4); A slag collecting inclined plate (18) is provided at the upper end of the front oil collecting plate (3), the slag collecting inclined plate (18) is inclined downward, a supporting inclined plate (19) is provided at the end of the slag collecting inclined plate (18), and the other end of the supporting inclined plate (19) is provided on the side wall of the front oil collecting plate (3); The slag scooping track groove (14) comprises a descending section and an ascending section, the terminal end of the descending section of the slag scooping track groove (14) is aligned with the lower end of the slag collecting inclined plate (18), the terminal end of the ascending section of the slag scooping track groove (14) is aligned with the upper end of the slag collecting inclined plate (18), and the ascending section of the slag scooping track groove (14) is parallel to the slag collecting inclined plate (18); The oil filter track groove (15) is aligned with the oil collecting pool (7) in the upper and lower parts, and the oil filter track groove (15) comprises a descending section, a horizontal section, an ascending section and an incorporating section. The starting end of the descending section of the oil filter track groove (15) is connected to the terminal end of the slag scraping track groove (14), the terminal end of the ascending section of the oil filter track groove (15) is aligned with the upper end of the rear oil collecting plate (4), and the terminal end of the incorporating end of the oil filter track groove (15) is connected to the end of the slag scraping track groove (13).

2. The flotation machine for treating oily wastewater according to claim 1, characterized in that: The scraping track groove (13) is of a racetrack type, and the lower side of the scraping track groove (13) is disconnected.

3. The flotation machine for treating oily wastewater according to claim 2, characterized in that: The scraper assembly (9) comprises a mounting frame (20), a mounting shaft (21), a sprocket (22), a chain (23), an adjustable scraper (24) and a scraper motor (25); the mounting frames (20) are symmetrically arranged on the outer side wall of the air flotation machine housing (1) in pairs; the mounting shaft (21) is arranged between two opposite mounting frames (20); the sprocket (22) is arranged at both ends of the mounting shaft (21); the chain (23) is arranged on the sprocket (22); the scraper motor (25) is arranged on the mounting frame (20); the scraper motor (25) is connected to one of the mounting shafts (21); and the adjustable scraper (24) is arranged in an array between the chains (23).

4. The flotation machine for treating oily wastewater according to claim 3, characterized in that: The adjustable scraper (24) comprises a connecting shaft (26), a fixed plate (27), a movable plate (28), a walking shaft (29), a restoring spring (30) and a mesh scraper (31). The two ends of the fixed plate (27) are fixedly mounted on the chain (23) via the connecting shaft (26). The movable plate (28) is a hollow cavity with an opening at the upper end. The movable plate (28) is slidably mounted on the fixed plate (27). The restoring spring (30) array is arranged inside the movable plate (28). One end of the restoring spring (30) is arranged on the end surface of the fixed plate (27), and the other end of the restoring spring (30) is arranged on the inner bottom wall of the movable plate (28). The edge of the mesh scraper (31) is hinged to the edge of the movable plate (28) through a torsion spring. The travel shaft (29) is symmetrically arranged on the upper part of the two side walls of the movable plate (28), and the end of the travel shaft (29) slides in the scraping track groove (13), the slag scooping track groove (14) and the oil filter track groove (15).

5. The flotation machine for treating oily wastewater according to claim 4, characterized in that: An air dissolving tank (32) is provided on the outer wall of the mixing tank (5) of the air flotation machine housing (1).

6. The flotation machine for treating oily wastewater according to claim 5, characterized in that: The running track (11) is arranged in a runway shape, and both ends of the lower side of the running track (11) are disconnected.

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