A curtain type air flotation machine for industrial wastewater treatment

Abstract

The present application relates to the technical field of wastewater treatment, and particularly relates to a curtain type air floatation machine for industrial wastewater treatment, characterized by comprising a ring-shaped bin, a gas floatation channel is vertically arranged in the ring-shaped bin, the gas floatation channel is used for conveying wastewater downward, and a plurality of flow guide plates are staggered arranged in the gas floatation channel; the wastewater flowing downward and the bubbles floating upward are guided and treated through the plurality of flow guide plates, so that the bubbles can form a bubble curtain at the edge of each flow guide plate, and thus the wastewater can be subjected to air floatation treatment when passing through each flow guide plate, so that the wastewater is subjected to continuous air floatation impurity removal work, the wastewater purification effect is improved, and meanwhile, the bubbles can be fully utilized when passing through each flow guide plate, so that the air floatation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a curtain type air flotation machine for industrial wastewater treatment. BACKGROUND

[0002] The air flotation process is a wastewater treatment method frequently used in modern industrial wastewater treatment processes, which mainly utilizes the floating effect of bubbles in wastewater and the adsorption effect of impurities in wastewater to achieve separation of impurities from wastewater. In the existing air flotation equipment, wastewater is introduced into the air flotation tank, and bubbles are discharged into the air flotation tank through the air injection structure installed at the bottom of the air flotation tank to realize air flotation. However, since the wastewater flows horizontally in the air flotation tank, the bubbles can only contact the wastewater once, i.e., the bubbles can only perform single air flotation treatment on a portion of the wastewater, which easily causes omission of impurities in the wastewater and results in poor air flotation effect. SUMMARY

[0003] To solve the above technical problems, the present application provides a curtain type air flotation machine for industrial wastewater treatment, which adopts the following specific technical solutions:

[0004] A curtain type air flotation machine for industrial wastewater treatment includes an annular bin, a gas flotation channel is vertically arranged in the annular bin, the gas flotation channel is used for downward conveying of wastewater, a plurality of guide plates are staggered arranged in the gas flotation channel, the guide plates are inclined, and the inclination directions of adjacent two guide plates are opposite, and an air discharge structure for upward discharging of bubbles is arranged at the bottom of the gas flotation channel.

[0005] Further, the axis of the annular bin is horizontal, a ring-shaped cavity is arranged inside the annular bin, the gas flotation channel is located at one side of the ring-shaped cavity, a reflux channel is arranged at the other side of the ring-shaped cavity, and the wastewater can flow annularly around the axis of the annular bin in the ring-shaped cavity; a water inlet pipe for water inlet and a water outlet pipe for water outlet are separately arranged at the front and back sides of the annular bin.

[0006] The end of the annular bin is provided with an agitating structure, and the agitating structure is used for providing power for the flow of the wastewater in the ring-shaped cavity.

[0007] Further, the end of the annular bin is arranged in a circular ring shape and is open.

[0008] The agitating structure includes a rotating disc rotatably arranged on the opening of the end of the annular bin, the rotating disc seals the opening, a plurality of paddles are arranged on the rotating disc inside the annular bin, the plurality of paddles rotate synchronously with the rotating disc in the annular area of the end of the annular bin, a main motor is arranged on the annular bin, a transmission wheel is arranged at the output end of the main motor, a transmission ring is arranged on the rotating disc, and the transmission wheel and the transmission ring are in transmission connection.

[0009] Further, the annular bin is provided with a impurity removal structure, and the impurity removal structure is used for removing the impurities floated by air;

[0010] The impurity removal structure comprises an impurity removal chamber eccentrically and vertically installed on the top of the annular bin, a communication cavity and a conveying cavity are formed in the impurity removal chamber, the conveying cavity is circular in shape, the communication cavity is communicated with the conveying cavity, an impurity removal channel is obliquely arranged on the impurity removal chamber, the impurity removal channel is oblique and communicated with the conveying cavity, the bottom of the communication cavity is communicated with the air floating channel, a rotating roller is rotatably arranged in the conveying cavity, a plurality of main hole plates are arranged on the outer wall of the rotating roller, and the plurality of main hole plates are synchronously rotated when the rotating roller rotates.

[0011] Further, a scraper is slidably arranged in the impurity removal channel, the end of the scraper extends into the conveying cavity and is in sliding contact with the outer wall of the rotating roller, and the scraper and the impurity removal channel are connected through a first elastic sheet.

[0012] Further, guide grooves are formed on the inner wall of the conveying cavity on the front and rear sides, and the guide grooves are composed of a first arc-shaped groove and a second arc-shaped groove.

[0013] A secondary hole plate is slidably arranged on each main hole plate along the radial direction of the rotating roller, sliding columns are arranged at both ends of the secondary hole plate, the sliding columns are slidably installed in the guide grooves, the holes in the secondary hole plate and the holes in the main hole plate are coincided when the sliding columns slide in the first arc-shaped groove, and the holes in the secondary hole plate and the holes in the main hole plate are misaligned when the sliding columns slide in the second arc-shaped groove.

[0014] Further, the exhaust structure comprises a diffuser chamber installed at the bottom of the air floating channel, the diffuser chamber is communicated with a gas inlet pipe for supplying gas into the diffuser chamber, and the diffuser chamber is communicated with the annular bin through a plurality of air holes.

[0015] Further, a cover plate is arranged in the annular cavity for covering and plugging the plurality of air holes, and the cover plate is connected with the annular bin through a second elastic sheet.

[0016] The advantages of the present application are:

[0017] By using a plurality of guide plates to guide the downward flowing wastewater and the upward floating bubbles, the bubble curtain can be formed at the edge of each guide plate, so that the wastewater can be subjected to air floatation treatment when passing through each guide plate, thereby continuously air floatation treatment of the wastewater is realized, and the wastewater purification effect is improved.

[0018] At the same time, since the wastewater can be subjected to air floatation treatment when passing through each guide plate, the bubbles can be fully utilized, and the air floatation effect is improved.

[0019] And because the wastewater flow direction is opposite to the bubble floating direction, the wastewater can flush the bubble, thus delaying the bubble floating speed, prolonging the bubble adsorption time, and further improving the floatation effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is Figure 1 is a top view and sectional structure schematic diagram of the floatation channel in the present application;

[0023] Figure 3 is Figure 1 is a sectional internal structure schematic diagram of the floatation channel in the present application;

[0024] Figure 4 is Figure 3 is an enlarged structure schematic diagram of the main hole plate in the present application;

[0025] Figure 5 is Figure 3 is an enlarged structure schematic diagram of the first arc-shaped groove in the present application;

[0026] The drawings are as follows: 1, floatation channel; 2, flow guide plate; 3, annular bin; 4, backflow channel; 5, water inlet pipe; 6, water outlet pipe; 7, rotating disc; 8, push plate; 9, main motor; 10, transmission wheel; 11, transmission ring; 12, impurity discharge chamber; 13, impurity discharge channel; 14, rotating roller; 15, main hole plate; 16, scraper; 17, first elastic sheet; 18, auxiliary hole plate; 19, sliding column; 20, first arc-shaped groove; 21, second arc-shaped groove; 22, air diffuser chamber; 23, air inlet pipe; 24, air hole; 25, cover plate; 26, second elastic sheet. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments.

[0028] In the description of the present application, it should be noted that the orientation or positional relationship belonging to the indication of "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The present embodiment is written in a progressive manner.

[0030] As shown in Figures 1 to 5 The curtain type air flotation machine for industrial wastewater treatment of the present application comprises an annular bin 3, a gas flotation channel 1 is vertically arranged in the annular bin 3, the gas flotation channel 1 is used for conveying wastewater downward, a plurality of guide plates 2 are arranged staggeredly in the gas flotation channel 1, the guide plates 2 are inclined, and the inclined directions of two adjacent guide plates 2 are opposite, and the gas flotation channel 1 is provided with an air exhaust structure at the bottom for discharging air bubbles upward.

[0031] In detail, the air flotation channel 1 is vertical, the wastewater in the air flotation channel 1 flows vertically from top to bottom, the inner wall of the air flotation channel 1 is provided with a plurality of guide plates 2 on the left and right sides, and the plurality of guide plates 2 on the left and right sides are staggered, the guide plate 2 on the left side of the inner wall of the air flotation channel 1 is inclined towards the upper right, the guide plate 2 on the right side of the inner wall of the air flotation channel 1 is inclined towards the upper left, when the wastewater flows through the plurality of guide plates 2, the wastewater can flow between the gaps between adjacent two guide plates 2, so that the flow track of the wastewater is S-shaped during downward flow, and the wastewater can pass through the edge position of each guide plate 2, the exhaust structure can discharge dense bubbles into the air flotation channel 1, when the bubbles float to the lowermost guide plate 2, the bubbles will float upwards along the bottom slope of the guide plate 2 and float off the guide plate 2 at the edge position of the guide plate 2 to the adjacent guide plate 2, at this time, the bubbles that have floated off will form a bubble curtain at the edge of the guide plate 2, as the bubbles continue to float upwards, a bubble curtain can be formed at the edge position of each guide plate 2, when the wastewater passes through the bubble curtain, the bubble curtain can adsorb and float the impurities in the wastewater, thereby achieving the purification of the wastewater. Since the wastewater can flow through the edge position of each guide plate 2, the bubble curtain formed at the edge position of each guide plate 2 can be used for air flotation treatment of the wastewater, that is, the wastewater can be subjected to multiple air flotation and impurity removal treatments by multiple bubble curtains, and at the same time, a part of the bubbles discharged by the exhaust structure can pass through the edge position of each guide plate 2 in turn, so that this part of the bubbles can be used for multiple air flotation and impurity removal treatments of the wastewater, facilitating the full use of the bubbles and improving the air flotation effect.

[0032] By using the plurality of guide plates 2 to guide the downward flowing wastewater and the upward floating bubbles, the bubbles can form a bubble curtain at the edge position of each guide plate 2, so that the wastewater can be subjected to air flotation treatment when passing through each guide plate 2, thereby continuously and multiple times air flotation and impurity removal of the wastewater, improving the wastewater purification effect, and at the same time, the bubbles can be fully utilized by being subjected to air flotation treatment when passing through each guide plate 2, thereby improving the air flotation effect. Since the flow direction of the wastewater is opposite to the upward floating direction of the bubbles, the wastewater can flush the bubbles, thereby slowing down the upward floating speed of the bubbles, prolonging the adsorption time of the bubbles, and further improving the air flotation effect.

[0033] Further, the axis of the annular bin 3 is horizontal, the annular bin 3 is provided with an annular cavity inside, the air flotation channel 1 is located on one side of the annular cavity, the other side of the annular cavity is provided with a reflux channel 4, the wastewater can flow annularly around the axis of the annular bin 3 in the annular cavity, the annular bin 3 is provided with a water inlet pipe 5 and a water outlet pipe 6 on the front and back sides for water inlet and water outlet respectively;

[0034] The end of the annular bin 3 is provided with a stirring structure, the stirring structure is used to provide power for the flow of the wastewater in the annular cavity.

[0035] In detail, wastewater enters the annular cavity of the annular chamber 3 through the inlet pipe 5 and is then discharged through the drain pipe 6. This allows the wastewater to flow horizontally within the annular cavity. Combined with the agitation structure, the wastewater flows in an annular pattern within the annular cavity, resulting in a spiral flow pattern. At this time, the wastewater flows downward from the flotation channel 1 and into the return channel 4. The wastewater in the return channel 4 then flows upward back into the flotation channel 1. This allows the wastewater to pass through multiple guide plates 2 multiple times and undergo repeated flotation treatment, greatly improving the flotation effect. The drain pipe 6 keeps the annular chamber 3 full of wastewater.

[0036] It should be noted that the bubbles will float in the spiral-flowing wastewater due to buoyancy. The impact force of the wastewater on the bubbles is relatively small compared to their buoyancy. Therefore, the spiral-flowing wastewater has a small lateral pushing effect on the bubbles, and the bubbles can smoothly enter the flotation channel. The wastewater is continuously introduced into the annular chamber 3 through the inlet pipe 5 and, after being treated by flotation, overflows out of the equipment through the drain pipe 6.

[0037] Furthermore, the end of the annular compartment 3 is configured as annular and open;

[0038] The agitation structure includes a rotating disk 7 rotatably mounted on the opening at the end of the annular chamber 3. The rotating disk 7 seals the opening. Multiple levers 8 are provided on the rotating disk 7 inside the annular chamber 3. The multiple levers 8 rotate synchronously with the rotating disk 7 in the annular area at the end of the annular chamber 3. The annular chamber 3 is equipped with a main motor 9. The output end of the main motor 9 is equipped with a transmission wheel 10. The rotating disk 7 is equipped with a transmission ring 11. The transmission wheel 10 and the transmission ring 11 are connected in a transmission manner.

[0039] In detail, since the wastewater in the flotation channel 1 flows vertically downwards, the shape of the flotation channel 1 is a vertical straight line. This area cannot allow the agitator 8 to make circular movements. Therefore, the end of the annular chamber 3 needs to be set as an annular shape to facilitate the circular movement of multiple agitators 8. The main motor 9 can drive the rotating disk 7 and multiple agitators 8 to rotate through the transmission wheel 10 and transmission ring 11. The agitator 8 stirs the wastewater in the annular cavity, so that the wastewater rotates and flows in the annular cavity. Combined with the way that the wastewater enters the annular chamber 3 from the inlet pipe 5 and is discharged from the drain pipe 6, the wastewater makes spiral flow.

[0040] Furthermore, the annular chamber 3 is provided with a debris removal structure, which is used to remove impurities from the air flotation.

[0041] The impurity removal structure comprises an eccentric vertical installation of an impurity removal chamber 12 on the top of the annular bin 3, a communication cavity and a conveying cavity are formed in the impurity removal chamber 12, the conveying cavity is circular in shape, and the communication cavity is communicated with the conveying cavity, an inclined impurity removal channel 13 is arranged on the impurity removal chamber 12, the impurity removal channel 13 is inclined and communicated with the conveying cavity, the bottom of the communication cavity is communicated with the air floatation channel 1, a rotating roller 14 is arranged in the conveying cavity, a plurality of main hole plates 15 are arranged on the outer wall of the rotating roller 14, and the rotating roller 14 drives the plurality of main hole plates 15 to rotate synchronously when the rotating roller 14 rotates.

[0042] In detail, a power motor is arranged on the impurity removal chamber 12 to provide rotating power for the rotating roller 14, the impurities floated by air floatation are floated into the communication cavity, the impurities floated by air floatation can be directly floated into the impurity removal chamber 12 by eccentrically arranging the impurity removal chamber 12 on the annular bin 3, the impurities floated by air floatation are avoided to be floated to the middle position of the top of the annular cavity and to cause the circulating flowing waste water to mix with the impurities again, the impurities are gathered in the communication cavity, the main hole plates 15 can lift and convey the impurities to the position of the impurity removal channel 13 when the rotating roller 14 and the plurality of main hole plates 15 rotate, the impurities naturally fall into the impurity removal channel 13 and are discharged, and the waste water in the communication cavity can pass through the holes of the main hole plates 15, and the impurity removal channel 13 is higher than the drain pipe 6.

[0043] Further, a scraper 16 is slidably arranged in the impurity removal channel 13, the end of the scraper 16 extends into the conveying cavity and is in sliding contact with the outer wall of the rotating roller 14, and the scraper 16 and the impurity removal channel 13 are connected through a first elastic sheet 17.

[0044] In detail, the scraper 16 is inclined to slide on the inner wall of the impurity removal channel 13, the first elastic sheet 17 provides a pushing force for the scraper 16, so that the scraper 16 is in abutment with the rotating roller 14, the main hole plates 15 rotate synchronously when the rotating roller 14 rotates, the scraper 16 moves relative to the rotating roller 14, the scraper 16 can scrape off the impurities adhered to the surface of the rotating roller 14, and the scraper 16 can also scrape off the impurities lifted by the main hole plates 15 when the main hole plates 15 move to the position of the scraper 16, so that the impurities are transferred to the scraper 16, which facilitates the timely cleaning of the impurities and the keeping of the rotating roller 14 and the main hole plates 15 clean, the impurities on the scraper 16 can be naturally discharged through the scraper 16, and the main hole plates 15 will push the scraper 16 to slide in the impurity removal channel 13 when the main hole plates 15 contact with the scraper 16, at this time, the first elastic sheet 17 is elastically deformed, so that the scraper 16 allows the main hole plates 15 to pass normally, and the scraper 16 avoids blocking the main hole plates 15.

[0045] Further, guide grooves are formed in the inner wall of the conveying cavity on the front and rear sides, the guide grooves are composed of a first arc-shaped groove 20 and a second arc-shaped groove 21.

[0046] Each of the main hole plate 15 is provided with a secondary hole plate 18 along the radial direction of the rotating roller 14, both ends of the secondary hole plate 18 are provided with a sliding column 19, the sliding column 19 is slidingly installed in the guide groove, when the sliding column 19 slides in the first arc-shaped groove 20, the holes on the secondary hole plate 18 and the holes on the main hole plate 15 are coincided, when the sliding column 19 slides in the second arc-shaped groove 21, the holes on the secondary hole plate 18 and the holes on the main hole plate 15 are dislocated.

[0047] In detail, the diameter of the first arc-shaped groove 20 is smaller than the diameter of the second arc-shaped groove 21, when the sliding column 19 slides in the first arc-shaped groove 20, the holes on the secondary hole plate 18 and the holes on the main hole plate 15 are coincided, at this time, the main hole plate 15 can fish out the impurities in the communication cavity, and the waste water in the communication cavity can pass through the holes, when the sliding column 19 slides in the second arc-shaped groove 21, the secondary hole plate 18 and the main hole plate 15 are dislocated, at this time, the holes on the secondary hole plate 18 and the holes on the main hole plate 15 are dislocated, and the waste water cannot pass through the secondary hole plate 18 and the main hole plate 15.

[0048] When the main hole plate 15 fishes out the impurities, part of the impurities will adhere to the back side of the main hole plate 15, because the discharge channel 13 and the scraper 16 are inclined, when the main hole plate 15 is separated from the scraper 16, the scraper 16 cannot touch the back of the main hole plate 15, at this time, the impurities on the back of the main hole plate 15 will remain on the main hole plate 15, when it enters the waste water in the conveying cavity, the waste water will pass through the main hole plate 15 to flush the impurities on the back of the main hole plate 15 and remain in the conveying cavity, which will cause the continuous increase of the impurities in the conveying cavity, and the smaller particles of impurities will pass through the holes on the main hole plate 15 and gather in the conveying cavity and cannot be discharged, and through the arrangement of the secondary hole plate 18, when the main hole plate 15 transfers the impurities to the scraper 16, the main hole plate 15 reenters the waste water in the conveying cavity, at this time, the secondary hole plate 18 and the main hole plate 15 are dislocated, and the waste water cannot pass through the main hole plate 15, which can make the main hole plate 15 push all the impurities in the waste water in the conveying cavity into the communication cavity, so as to facilitate the impurities to gather in the communication cavity and be fished out, even the smaller particles of impurities can also be gathered, when the impurities gather more, they will adhere to each other, thereby facilitating the main hole plate 15 to fish out.

[0049] Further, the exhaust structure includes a gas distribution chamber 22 installed at the bottom of the air flotation channel 1, the gas distribution chamber 22 is communicated with an air inlet pipe 23 for supplying air into the gas distribution chamber 22, and the gas distribution chamber 22 is communicated with the annular bin 3 through a plurality of air holes 24.

[0050] In detail, the ambient air is pumped into the air inlet pipe 23 and the gas distribution chamber 22, the air in the gas distribution chamber 22 can be discharged into the air flotation channel 1 through the plurality of air holes 24, so that the air forms bubbles and performs air flotation treatment on the waste water.

[0051] Further, the annular cavity is provided with a cover plate 25 for covering and plugging the plurality of air holes 24, the cover plate 25 is connected with the annular cavity 3 through a second elastic sheet 26, when the air holes 24 exhaust, the gas pushes the cover plate 25 to separate from the air holes 24.

[0052] In detail, the cover plate 25 covers and plugs the plurality of air holes 24, the second elastic sheet 26 provides elastic thrust for the cover plate 25, so as to avoid the wastewater into the air holes 24 and the air chamber 22, when the air flotation operation is performed, the air pressure pushes the cover plate 25 to open, so that the air normally passes through the air holes 24, and because the air pressure pushes the cover plate 25 to open, and the cover plate 25 is supported by the second elastic sheet 26, so the cover plate 25 moves upward, because the cover plate 25 is inclined, so the cover plate 25 plays a supplementary guiding role for the air bubbles, so that the air bubbles float into the air flotation channel.

[0053] The above only describes the preferred embodiments of the present application, it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A curtain type air floatation machine for industrial wastewater treatment, characterized by, The application relates to a wastewater treatment device, which comprises a ring-shaped bin (3), a gas float channel (1) vertically arranged in the ring-shaped bin (3) and used for downwardly conveying wastewater, and a plurality of guide plates (2) staggered arranged in the gas float channel (1); the guide plates (2) are inclined, and the inclined directions of two adjacent guide plates (2) are opposite; and an exhaust structure for upwardly discharging bubbles is arranged at the bottom of the gas float channel (1). The axis of the ring-shaped bin (3) is horizontal, a ring-shaped cavity is arranged in the ring-shaped bin (3), the gas float channel (1) is arranged on one side of the ring-shaped cavity, a backflow channel (4) is arranged on the other side of the ring-shaped cavity, and the wastewater can flow around the axis of the ring-shaped bin (3) in the ring-shaped cavity; a water inlet pipe (5) for water inlet and a water outlet pipe (6) for water outlet are arranged on the front and back sides of the ring-shaped bin (3) respectively. An agitating structure is arranged at the end of the ring-shaped bin (3), and the agitating structure is used for providing power for the flow of the wastewater in the ring-shaped cavity. A foreign matter discharging structure is arranged on the ring-shaped bin (3), and the foreign matter discharging structure is used for discharging the foreign matters in the gas float. The foreign matter discharging structure comprises a foreign matter discharging chamber (12) eccentrically and vertically arranged on the top of the ring-shaped bin (3), a communication cavity and a conveying cavity are arranged in the foreign matter discharging chamber (12), the conveying cavity is circular, the communication cavity is communicated with the conveying cavity, a foreign matter discharging channel (13) is obliquely arranged on the foreign matter discharging chamber (12) and communicated with the conveying cavity, the bottom of the communication cavity is communicated with the gas float channel (1), a rotating roller (14) is rotatably arranged in the conveying cavity, a plurality of main hole plates (15) are arranged on the outer wall of the rotating roller (14), and the rotating roller (14) drives the plurality of main hole plates (15) to synchronously rotate when the rotating roller (14) rotates. A scraper (16) is slidably arranged in the foreign matter discharging channel (13), the end of the scraper (16) extends into the conveying cavity and is in sliding contact with the outer wall of the rotating roller (14), and the scraper (16) is connected with the foreign matter discharging channel (13) through a first elastic sheet (17). First and second arc-shaped grooves (20) and (21) are arranged on the front and back sides of the inner wall of the conveying cavity. A secondary hole plate (18) is slidably arranged on each main hole plate (15) along the radial direction of the rotating roller (14), sliding columns (19) are arranged at the two ends of the secondary hole plate (18), and the sliding columns (19) are slidably arranged in the guide grooves; when the sliding columns (19) slide in the first arc-shaped groove (20), the holes in the secondary hole plate (18) and the holes in the main hole plate (15) are coincided; and when the sliding columns (19) slide in the second arc-shaped groove (21), the holes in the secondary hole plate (18) and the holes in the main hole plate (15) are dislocated.

2. The curtain-type air flotation machine for industrial wastewater treatment according to claim 1, characterized in that, The end of the ring-shaped bin (3) is circular and open. The stirring structure comprises a rotating disc (7) rotatably mounted on the opening of the annular bin (3), the rotating disc (7) seals the opening, a plurality of stirring plates (8) are arranged on the inner side of the rotating disc (7) of the annular bin (3), the plurality of stirring plates (8) rotate synchronously with the rotating disc (7) in the annular area at the end of the annular bin (3), a main motor (9) is arranged on the annular bin (3), a transmission wheel (10) is arranged at the output end of the main motor (9), a transmission ring (11) is arranged on the rotating disc (7), and the transmission wheel (10) is in transmission connection with the transmission ring (11).

3. The curtain-type air flotation machine for industrial wastewater treatment according to claim 2, characterized in that, The exhaust structure comprises a gas distribution chamber (22) mounted at the bottom of the air floating channel (1), the gas distribution chamber (22) is communicated with an air inlet pipe (23) for supplying air into the gas distribution chamber (22), and the gas distribution chamber (22) is communicated with the annular bin (3) through a plurality of air holes (24).

4. The curtain-type air flotation machine for industrial wastewater treatment according to claim 3, characterized in that, A cover plate (25) is arranged in the annular cavity and used for sealing the plurality of air holes (24), the cover plate (25) is connected with the annular bin (3) through a second elastic sheet (26), and when the air holes (24) exhaust, the cover plate (25) is pushed away from the air holes (24) by the gas.

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