CN114632367A - Air cleaning screen cloth filter equipment - Google Patents

Abstract

The invention discloses an air cleaning screen filtering device which comprises mounting brackets, a roller filter screen and a cleaning assembly, wherein two ends of the roller filter screen are provided with connecting flanges for sealing the roller filter screen, the middle of one connecting flange is provided with a hole and extends outwards to be movably sleeved with a water outlet, the water outlet is fixed on the mounting brackets through a fixed pressing piece, the middle of the other connecting flange is movably arranged on the other mounting bracket so that the roller filter screen can roll between the two mounting brackets, and the top of the mounting bracket is fixedly provided with a motor connecting plate for supporting a servo motor. The top of the roller filter screen is positioned above the water surface through the buoyancy of the buoy, and one side of the roller filter screen moves from the lower part of the water surface to the upper part of the water surface in the rotating process, so that small-particle silt and algae can be attached conveniently, the cleaning efficiency of impurities is improved, and the filtering efficiency and the filtering effect of the roller filter screen are further improved.

Description

An air cleaning screen filter device

technical field

The invention relates to the technical field of filtering equipment, in particular to an air cleaning screen filtering device.

Background technique

The equipment conventionally used for surface cement sand and other sewage treatment and filtration are mainly sand and gravel filters, mesh filters and laminated filters. , Filtration is mainly the function of resistance interception, which is mainly used to remove the suspended solids in the water. After the water flow enters from the water inlet of the filter and flows through the filter layer, the suspended impurities in the water are adsorbed by the filter layer. The filtered water flows from the filter cap to the The water outlet, the mesh filter is to intercept the impurities in the water with the particle size larger than the size of the filter mesh on the surface of the filter screen when the sewage passes through the filter screen. The filtered water flows out through the water outlet, and the laminated filter is filtered in the sewage. When the net is used, the impurities in the water whose particle size is larger than the size of the stacking orifice of the laminations are intercepted and retained on the surface of the water inlet side, and the filtered water flows out through the water outlet;

In the prior art filter device, when cleaning, one is manual cleaning, the water is directly cut off and then the filter element is taken out, and the administrator cleans it with clean water; the other is automatic cleaning, which can clean the surface of the filter element by backwashing with clean water The impurities are discharged from the drain valve to complete the cleaning. The disadvantages are that the working pressure is high, the hydraulic loss is high, the manual cleaning consumes a lot of labor and is prone to water blocking and flow interruption events. In the case of timely cleaning, the phenomenon of water blocking is easy to occur. When the water blocking is serious, the water in the grit chamber will overflow, which will cause the foundation of the grit chamber to be eroded and destroy the grit chamber. Therefore, it is necessary to provide a A filter device that uses air power to remove debris to overcome the above shortcomings.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problem of cleaning in the prior art. One is manual cleaning, the water is directly stopped and then the filter element is taken out, and the management personnel use clean water for cleaning; the other is automatic cleaning, which can be backwashed by clean water. The impurities on the surface of the cleaning filter element are discharged by the drain valve to complete the cleaning. The disadvantage is that the working pressure is high, the hydraulic loss is high, the manual cleaning consumes a lot of labor and is prone to water blocking and flow interruption events, and frequent automatic cleaning results in waste of water resources. Therefore, an air cleaning screen filter device is proposed.

In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an air cleaning screen filter device, comprising a mounting bracket, a drum filter screen and a cleaning assembly, the two ends of the drum filter screen are provided with connecting flanges for sealing them, wherein The middle opening of one connecting flange extends outward and is movably sleeved with the water outlet, the water outlet is fixed on the mounting bracket by the fixed pressure piece, and the middle of the other connecting flange is movably arranged on the other mounting bracket to make the drum filter screen. It can be rolled between the two mounting brackets. The top of the mounting bracket is fixedly installed with a motor connecting plate that supports the servo motor. The power end of the servo motor is provided with a belt around the surface of the connecting flange to provide the drum filter screen rotation. Power, two buoy brackets are fixed on the installation bracket, the end of the buoyant bracket is fixed with a buoy that provides buoyancy for the equipment, and a filter screen brush for cleaning the surface of the drum filter screen is arranged between the two installation brackets; the filter device also It includes a cleaning component that removes small particles of sediment by air power, and the cleaning component is located inside and outside the drum screen.

Further preferably, the cleaning assembly includes a guide rod bracket, a positive and negative guide rail rod, a hollow integrated plate, a lead screw ring, a slider adjustment gland, a sliding guide rail, a sewage pipe, a sewage inlet, a sewage outlet and a vacuum adsorption pump, and a mounting bracket. A guide rod bracket is fixed on the guide rod bracket, and the guide rod bracket limits the positive and negative guide rail rods to be driven by the servo motor to rotate. Between the two mounting brackets, there are parallel positive and negative guide rail rods and sliding guide rails. Two slidable hollow integrated boards are arranged on the guide rail, the top of the two hollow integrated boards is connected with a sewage pipe, the end of the sewage pipe is provided with a vacuum adsorption pump, and the bottom and side of the vacuum adsorption pump are the sewage outlet and the sewage inlet respectively. Counterclockwise and clockwise screw grooves are provided on the surface of the front and rear guide rail rods, and a screw ring matched with the screw grooves is arranged in the gap between the front and back rail rods and the hollow integrated plate.

Further preferably, the cleaning assembly includes a hollow scraper, a support pipe, a sewage inlet, a sewage outlet and a vacuum adsorption pump, and a hollow scraper directly above the drum filter is arranged between the two mounting brackets. A support pipe is connected, the end of the support pipe is provided with a vacuum adsorption pump, and the bottom and side of the vacuum adsorption pump are respectively a sewage outlet and a sewage inlet.

Further preferably, the cleaning assembly includes a hollow scraper, a support pipe, a waterproof bearing and a vacuum adsorption pump, and a waterproof bearing is fixedly arranged through the middle of the other connecting flange, and a support pipe is arranged in the middle of the waterproof bearing, and one end of the support pipe is provided. A hollow scraper is fixed above the inner wall of the drum screen, and the other end of the support pipe is provided with a vacuum adsorption pump for injecting air into it.

Further preferably, the top of the hollow integrated board is movably provided with a slider adjustment gland, the slider adjustment gland passes through the lead screw ring and abuts on the positive and negative guide rails, and the tops of the two hollow integrated boards are provided with connecting pipes, which are connected to each other. The ends of the pipes are connected to the sewage pipes.

Further preferably, the hollow scraper rod is arranged in parallel directly above the drum filter screen, and the bottom of the hollow scraper rod is provided with sewage suction holes at equal intervals.

Further preferably, the top of the hollow scraping rod is provided with sewage suction holes at equal intervals, and the end of the support pipe is kept perpendicular to the hollow scraping rod and is bent at a right angle.

Further preferably, the drum screen is kept parallel to the two buoys, and the height of the top of the drum screen is higher than the height of the top of the buoy.

Further preferably, the power end of the servo motor is provided with a pulley, and the belt wraps around the pulley, the connecting flange and the positive and negative guide rails and drives synchronously.

Further preferably, the servo motor is connected with a controller through a wire, the controller is located on the filter screen brush, and the water outlet is connected with an external suction pump to form a negative pressure inside the drum screen.

The beneficial effects of the present invention are:

1. The sewage enters the clean water buffer area composed of the drum filter and the connecting flange from the grit chamber through the drum filter, and then the clean water flows out through the water outlet. When the sewage passes through the drum filter from the grit chamber, the sediment and the Other dirt stays on the surface of the drum filter screen, and then drives the drum filter screen to rotate through the servo motor, and sweeps off the large particles of sediment, branches, leaves, weeds and other general dirt that remain on the surface of the drum filter screen through the screen brush. , and rotate the small particles of sediment, algae and other dirt that remain on the surface of the drum filter to the vacuum adsorption and guide rail connection integrated board, and suck the sediment and dirt away through the adsorption pressure; it has a relatively complete structure, High reliability, simple and reasonable operation, and significantly improved cleaning efficiency of floating objects in the grit chamber;

2. The buoyancy of the buoy makes the top of the drum filter above the water surface. During the rotation of the drum filter, one side moves from below the water surface to above the water surface, which is convenient for the attachment of small particles of sediment and algae, thereby increasing the surface area. The cleaning efficiency of debris, thereby increasing the filtration efficiency and filtration effect of the drum filter;

3. The hollow integrated board removes the sundries through the vacuum adsorption pump, which saves a lot of water resources during the cleaning process, and the cleaning work is carried out simultaneously with the filtration work of the drum filter, which can effectively increase the filtration efficiency and effect of the drum filter, and Filtering under natural water potential pressure, while transporting sediment and dirt to the water body, and vacuum adsorption cleaning, which not only effectively reduces the air pressure for cleaning, but also reduces the water content of sediment and other dirt, effectively reducing cleaning power consumption.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic front view of the present invention as a whole;

Fig. 3 is the bottom view schematic diagram of the whole of the present invention;

Fig. 4 is the left side schematic diagram of the whole of the present invention;

5 is a schematic diagram of a second embodiment of the present invention;

FIG. 6 is a schematic diagram of a third embodiment of the present invention;

In the figure: water outlet 1, connecting flange 2, mounting bracket 3, fixed pressure piece 4, guide rod bracket 5, motor connecting plate 6, servo motor 7, positive and negative guide rail rod 8, hollow integrated plate 9, lead screw ring 10 , slider adjustment gland 11, sliding guide 12, sewage pipe 13, sewage inlet 14, sewage outlet 15, vacuum adsorption pump 16, belt 17, buoy support 18, buoy 19, filter brush 20, drum filter 21, control 22 , hollow scraper rod 23 , support pipe 24 , waterproof bearing 25 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

Example 1:

1-4, an air cleaning screen filter device includes a mounting bracket 3, a drum screen 21 and a cleaning assembly. The two ends of the drum screen 21 are provided with connecting flanges 2 for sealing them. One of the connection methods The middle of the flange 2 has a hole and extends outward to be movably sleeved with the water outlet 1. The water outlet 1 is fixed on the mounting bracket 3 by the fixed pressure piece 4, and the middle of the other connecting flange 2 is movably arranged on the other mounting bracket 3. The drum filter 21 can be rolled between the two mounting brackets 3, the top of the mounting bracket 3 is fixedly installed with the motor connecting plate 6 supporting the servo motor 7, and the power end of the servo motor 7 is provided with a winding around the connecting flange 2. The belt 17 on the surface enables it to provide power for the rotation of the drum screen 21. Two buoy brackets 18 are fixed on the mounting bracket 3. The end of the buoyant bracket 18 is fixed with a buoyancy 19 that provides buoyancy for the equipment. A filter brush 20 for cleaning the surface of the drum filter 21 is arranged between them; the filter device also includes a cleaning component for cleaning small particles of sediment by aerodynamic force, and the cleaning component is located inside and outside the drum filter 21 .

Preferably, the cleaning assembly includes a guide rod bracket 5, a positive and negative guide rod 8, a hollow integrated plate 9, a lead screw ring 10, a slider adjustment gland 11, a sliding guide rail 12, a sewage pipe 13, a sewage inlet 14, and a sewage outlet 15 and The vacuum adsorption pump 16, the guide rod bracket 5 is fixed on the installation bracket 3, the guide rod bracket 5 limits the positive and negative guide rail rods 8 to be driven by the servo motor 7 to rotate, and the two installation brackets 3 are provided with parallel positive and negative guide rods. The reverse rail rod 8 and the sliding rail 12, the front and back rail rods 8 and the sliding rail 12 are provided with two slidable hollow integrated plates 9, the tops of the two hollow integrated plates 9 are connected with a sewage pipe 13, and the end of the sewage pipe 13 A vacuum adsorption pump 16 is provided, and the bottom and side of the vacuum adsorption pump 16 are the sewage outlet 15 and the sewage inlet 14 respectively. A lead screw ring 10 matched with the lead screw groove is arranged in the gap between the hollow integrated plate 9 and the hollow integrated plate 9;

During the specific implementation, the servo motor 7 drives the forward and reverse guide rail rods 8 to rotate, and the forward and reverse guide rail rods 8 rotate through the screw groove to match the screw ring 10, so that the hollow integrated board 9 moves to the right, and then passes through another reverse screw screw. The hollow integrated plate 9 moves to the left, and then the hollow integrated plate 9 reciprocates left and right. The vacuum adsorption pump 16 generates negative pressure inside the sewage pipe 13, the hollow integrated plate 9 and the connecting pipe, and the bottom of the hollow integrated plate 9 pushes the roller Small particles of sediment, algae and other dirt on the top of the filter screen 21 are adsorbed into the hollow integrated plate 9 and then discharged through the sewage outlet 15 of the vacuum adsorption pump 16 .

Preferably, the top of the hollow integrated board 9 is movably provided with a slider adjustment cover 11, the slider adjustment cover 11 passes through the screw ring 10 and abuts on the positive and negative guide rails 8, and the tops of the two hollow integrated boards 9 are provided with a connection Pipe, the end of the connecting pipe is connected with the sewage pipe 13, the connecting pipe keeps the two hollow integrated boards 9 fixed, and the sliding guide 12 ensures that the two hollow integrated boards 9 move smoothly between the two mounting brackets 3 .

Preferably, the power end of the servo motor 7 is provided with a pulley, the belt 17 is wrapped around the pulley, the connecting flange 2 and the positive and negative guide rails 8 and driven synchronously, the servo motor 7 drives the connecting flange 2 and the drum filter 21 through the belt 17 Synchronous rotation, the rotation of the drum filter screen 21 rotates the small particles of sediment, algae and other dirt retained on the surface and sends it to the hollow integrated plate 9, and the drum filter screen 21 completes a sundries cleaning every time it rotates, effectively Therefore, many problems such as preventing the filter holes of the drum filter screen 21 from being blocked are prevented.

Preferably, the drum screen 21 is kept parallel to the two buoys 19, the height of the top of the drum screen 21 is higher than the height of the top of the buoy 19, the buoy 19 generates buoyancy and floats on the water surface, so that the top of the drum screen 21 is located on the water surface, Small particles of sediment and algae can be effectively attached to the surface of the drum filter 21, which facilitates the transportation of small particles of sediment and algae.

Preferably, a controller 22 is connected to the servo motor 7 through wires, the controller 22 is located on the screen brush 20 , the end of the sewage pipe 13 is connected to the sewage inlet 14 , and the water outlet 1 is connected to an external suction pump, so that the inside of the drum screen 21 is connected. Negative pressure is formed, and the water outlet 1 pumps away the filtered clean water through an external water pump, so that the sewage is continuously filtered by the drum filter screen 21, and the filtration work can be performed quickly.

Embodiment 2:

The difference from the first embodiment is that, referring to FIG. 5 , the cleaning assembly includes a hollow scraper 23 , a support pipe 24 , a sewage inlet 14 , a sewage outlet 15 and a vacuum adsorption pump 16 . The hollow scraper rod 23 directly above the net 21, the middle of the hollow scraper rod 23 is connected with a support pipe 24, the end of the support pipe 24 is provided with a vacuum adsorption pump 16, and the bottom and side of the vacuum adsorption pump 16 are the sewage outlet 15 and the sewage discharge respectively. import 14;

In specific implementation, the vacuum adsorption pump 16 generates negative pressure inside the support pipe 24 and the hollow scraper 23, and the hollow scraper 23 can absorb the small particles of sediment and algae on the surface of the drum screen 21, which is similar to the first embodiment. The structure is simpler and the cleaning process is faster and more convenient.

Preferably, the hollow scraper 23 is arranged in parallel directly above the drum screen 21, and the bottom of the hollow scraper 23 is provided with sewage suction holes at equal intervals. The small particles of sediment and algae on the surface are sucked away and discharged through the sewage outlet 15 of the vacuum adsorption pump 16 .

Embodiment three:

The difference from the first embodiment is that, referring to FIG. 6 , the cleaning assembly includes a hollow scraper rod 23, a support pipe 24, a waterproof bearing 25 and a vacuum adsorption pump 16, and a waterproof bearing 25 is fixed through the middle of the other connecting flange 2, The middle of the waterproof bearing 25 is provided with a support pipe 24, one end of the support pipe 24 is fixed with a hollow scraper 23 located above the inner wall of the drum screen 21, and the other end of the support pipe 24 is provided with a vacuum adsorption pump 16 for injecting air into it;

In specific implementation, the hollow scraper 23 is located on the inner side of the drum filter 21, and the vacuum adsorption pump 16 injects air into the support pipe 24, so that the top of the hollow scraper 23 continuously discharges air, and the air will pass through the filter of the drum filter 21. The air blows away the small particles of sediment and algae in the filter holes, preventing the clogging of the drum filter 21 and realizing the cleaning effect. The difference from the first and second embodiments is that sewage cannot be discharged, and the operation of the equipment is more stable. .

Preferably, the top of the hollow scraper rod 23 is provided with sewage suction holes at equal intervals, the end of the support pipe 24 is kept perpendicular to the hollow scraper rod 23 and is bent at a right angle, and the suction holes on the top of the hollow scraper rod 23 are continuously blown out. Air, when the drum filter 21 rotates so that the filter holes are connected with the dirt suction holes, the air enters the filter holes of the drum filter 21, blowing away the sundries in the filter holes of the drum filter 21, and realizes the cleaning of the drum filter 21. For the purpose, the waterproof bearing 25 enables the connecting flange 2 to rotate on the periphery of the supporting pipe 24 .

In the present invention, when using, firstly, the external pipeline is sleeved with the water outlet 1, the external pipeline is connected to the pump, and then the equipment is put into the sewage pool, the buoyancy 19 generates buoyancy to make the drum screen 21 float on the water surface, and the The vacuum adsorption pump 16 is placed on the bank of the sewage pool, and the suction pump continuously evacuates the water inside the drum filter 21, so that the sewage is continuously filtered into the drum filter 21 and enters into its interior. The servo motor 7 drives the two connections through the belt 17. The flange 2 and the drum filter screen 21 rotate synchronously, and the large particles of sediment, branches, leaves, weeds, etc. and other general dirt remaining on the surface of the drum filter screen 21 are swept away by the filter screen brush 20, and will be retained in the drum filter screen. Small particles of sediment, algae and other dirt on the surface of the net 21 are rotated and sent to the bottom of the integrated plate 9, and the vacuum adsorption pump 16 generates negative pressure inside the sewage pipe 13, the hollow integrated plate 9 and the connecting pipeline, and the bottom of the hollow integrated plate 9 generates negative pressure. The small particles of sediment, algae and other dirt on the top of the drum filter 21 are adsorbed into the hollow integrated board 9, and then the dirt is transported from the inside of the sewage pipe 13 by the vacuum adsorption pump 16 to the sewage inlet 14. Enter and then discharge through the sewage outlet 15, the servo motor 7 drives the positive and negative guide rods 8 to rotate, and the positive and negative guide rods 8 rotate through the lead screw groove to match the lead screw ring 10, so that the hollow integrated plate 9 moves to the right, and then passes through another reverse direction. The screw groove of the screw makes the hollow integrated board 9 move to the left, so that the left and right reciprocating motion of the hollow integrated board 9 continuously removes the sundries.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides an air cleaning screen cloth filter equipment, includes installing support (3), cylinder filter screen (21) and clearance subassembly, the both ends of cylinder filter screen (21) are provided with flange (2) with its is sealed, and the centre trompil of one of them flange (2) outwards extends and establishes with delivery port (1) activity cover, and delivery port (1) is fixed on installing support (3) through fixed casting die (4), its characterized in that: the middle of the other connecting flange (2) is movably arranged on the other mounting bracket (3) to enable the roller filter screen (21) to roll between the two mounting brackets (3), a motor connecting plate (6) for supporting the servo motor (7) is fixedly arranged at the top of each mounting bracket (3), a belt (17) wound on the surface of each connecting flange (2) is arranged at the power end of each servo motor (7) to enable the belt to provide power for the rotation of the roller filter screen (21), two buoy brackets (18) are fixedly arranged on the mounting brackets (3), a buoy (19) for providing buoyancy for equipment is fixed at the end part of each buoy bracket (18), and a filter screen brush (20) for cleaning the surface of the roller filter screen (21) is arranged between the two mounting brackets (3); the filter device also comprises a cleaning assembly for cleaning the small-particle sediment through aerodynamic force, and the cleaning assembly is positioned inside and outside the roller filter screen (21).

2. The air cleaning screen filtering device according to claim 1, wherein the cleaning assembly comprises a guide rod support (5), a positive and negative guide rail rod (8), a hollow integrated plate (9), a lead screw ring (10), a slider adjusting gland (11), a sliding guide rail (12), a sewage discharge pipe (13), a sewage discharge inlet (14), a sewage discharge outlet (15) and a vacuum adsorption pump (16), the guide rod support (5) is fixed on the mounting support (3), the guide rod support (5) limits the positive and negative guide rail rod (8) to enable the positive and negative guide rail rod to rotate under the driving of a servo motor (7), the positive and negative guide rail rod (8) and the sliding guide rail (12) which are kept parallel are arranged between the two mounting supports (3), the two slidable hollow integrated plates (9) are arranged on the positive and negative guide rail rod (8) and the sliding guide rail (12), and the sewage discharge pipe (13) is connected to the tops of the two hollow integrated plates (9), the end part of the sewage discharge pipe (13) is provided with a vacuum adsorption pump (16), the bottom and the side surface of the vacuum adsorption pump (16) are respectively a sewage discharge outlet (15) and a sewage discharge inlet (14), the surface of the front and back guide rail rod (8) is provided with a screw rod groove which is spiral anticlockwise and spiral clockwise, and a screw rod ring (10) which is matched with the screw rod groove is arranged in the gap between the front and back guide rail rod (8) and the hollow integrated plate (9).

3. The air cleaning screen filtering device according to claim 2, wherein the cleaning assembly comprises a hollow scraping rod (23), a supporting pipeline (24), a sewage inlet (14), a sewage outlet (15) and a vacuum adsorption pump (16), the hollow scraping rod (23) positioned right above the roller filter screen (21) is arranged between the two mounting brackets (3), the supporting pipeline (24) is connected to the middle of the hollow scraping rod (23), the vacuum adsorption pump (16) is arranged at the end part of the supporting pipeline (24), and the bottom and the side surface of the vacuum adsorption pump (16) are respectively the sewage outlet (15) and the sewage inlet (14).

4. The air cleaning screen filtering device according to claim 3, wherein the cleaning assembly comprises a hollow scraping rod (23), a supporting pipeline (24), a waterproof bearing (25) and a vacuum adsorption pump (16), the waterproof bearing (25) is fixedly arranged in the middle of the other connecting flange (2) in a penetrating manner, the supporting pipeline (24) is arranged in the middle of the waterproof bearing (25), the hollow scraping rod (23) positioned above the inner wall of the roller filter screen (21) is fixed at one end of the supporting pipeline (24), and the vacuum adsorption pump (16) for injecting air into the hollow scraping rod is arranged at the other end of the supporting pipeline (24).

5. The air cleaning screen filtering device as claimed in claim 2, wherein a sliding block adjusting gland (11) is movably arranged at the top of the hollow manifold plates (9), the sliding block adjusting gland (11) penetrates through the screw rod ring (10) to abut against the forward and reverse guide rails (8), a connecting pipeline is arranged at the top of each of the two hollow manifold plates (9), and the end part of the connecting pipeline is connected with the sewage discharge pipe (13).

6. The air cleaning screen filtering device as recited in claim 3, wherein the hollow scraping rod (23) is arranged in parallel right above the roller filter screen (21), and the bottom of the hollow scraping rod (23) is provided with dirt sucking holes at equal intervals.

7. An air cleaning screen filter unit as claimed in claim 4, wherein the top of the hollow scraping bar (23) is provided with dirt suction holes at equal intervals, and the end of the support pipe (24) is perpendicular to the hollow scraping bar (23) and is provided with a right angle bend.

8. The air washer screen filter of claim 4, wherein the roller screen (21) is parallel to both pontoons (19), and wherein the top of the roller screen (21) is at a higher elevation than the top of the pontoons (19).

9. An air cleaning screen filter arrangement as claimed in claim 2 characterised in that the servo motor (7) is provided with a pulley at its power end and the belt (17) is trained around the pulley, the attachment flange (2) and the forward and reverse guide rails (8) and driven synchronously.

10. The air cleaning screen filtering device as claimed in claim 4, wherein the servo motor (7) is connected with a controller (22) through a wire, the controller (22) is positioned on the screen brush (20), and the water outlet (1) is connected with an external water pump, so that negative pressure is formed inside the roller screen (21).

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