Sewage filtering treatment device and treatment method thereof

Abstract

The invention relates to the technical field of sewage treatment, and mainly relates to a sewage filtering treatment device and a treatment method thereof.The sewage filtering treatment device comprises an inner barrel and an outer barrel which are fixed through a connecting piece, and further comprises a conical cover fixed to the top of the inner barrel and an inner retaining ring fixed to the top of the outer barrel; a baffle ring is fixed on the outer side of the conical cover; the outer side of the inner pipe is fixed to the inner wall of the inner barrel through a connecting plate, and a driving rod is installed in the inner pipe. Traditional sewage treatment equipment is improved, after a plastic bag is attached, a gap is formed between the plastic bag and a conical cover through internal blowing, then the plastic bag is shoveled and pushed in cooperation with a shoveling plate, and therefore the plastic bag can be conveniently cleaned; the plastic bag cleaning device has the advantages that the plastic bag attached to the conical cover can be effectively cleaned, normal drainage and filtration of sewage are not affected, meanwhile, the falling plastic bag can be cut by the cutting unit, the plastic bag and internal particles can be separated, and discharge and collection are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage filtering treatment device and a treatment method thereof. Background Art

[0002] In daily life, sewage and rainwater on the road will flow into the sewage canal and be collected. During the collection process, sewage will flow into the sewage canal together with debris on the ground. Large debris will be intercepted by equipment such as grille filters installed in the sewage canal. Most of the intercepted debris can be easily cleaned up, but some plastic film products, such as plastic bags, are light in weight and easily washed away. They are easily attached to equipment such as grille filters. When the number is large, they stick to the filter net and cover the filter mesh, which will affect normal drainage.

[0003] Existing Chinese patent document: CN118320497B discloses a sewage treatment device for sewage treatment, wherein an inner and outer barrel are designed, and a plastic bag will fall into the gap between the inner and outer barrels after passing through the upper end of the inner barrel, and will be processed by a hanging unit and a cutting unit, and a filter screen is provided on the inner barrel for filtering sewage;

[0004] In this solution, the inner barrel is divided into a filter cavity and a cavity. The filter cavity is used for sewage filtering, while the cavity is used for the installation of the internal drive unit. Too many cavities will reduce the space required for sewage filtration, which means that a part of the filter net is already blocked by the plastic bag. Secondly, the inner barrel is mainly structured with a downward tilted top, so that the fallen plastic bag is knocked down by its own gravity. However, when the plastic bag is unfolded and laid on its outside, its contact area is large and the friction is large, and gravity cannot effectively drive the plastic bag to slide down, which can easily cause the plastic bag to adhere to the filter net, thereby affecting the drainage effect. Summary of the invention

[0005] The object of the present invention is to provide a sewage filtering treatment device and a treatment method thereof, so as to solve the problem in the above background technology that the filter net is easily blocked by the plastic bag, making it impossible to drain water normally.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sewage filtering treatment device, comprising an inner barrel and an outer barrel, the inner barrel and the outer barrel are fixed by a connecting plate, and also comprising a conical cover fixed to the top of the inner barrel and an inner buckle ring fixed to the top of the outer barrel, the arc surface of the conical cover is a screen structure, and a retaining ring is fixed to the outer side of the conical cover; and an inner tube, the outer side of the inner tube is fixed to the inner wall of the inner barrel by a connecting plate, and a driving rod is rotatably installed in the inner tube through a bearing, the top of the driving rod rotates through the conical cover, and a cleaning component for cleaning plastic bags is fixed; and a cutting unit installed between the inner barrel and the outer barrel, the cutting of plastic bags is achieved by the cutting unit, the outer barrel is provided with a discharge port at the cutting unit, and a guide plate is fixed in the discharge port; and a driving component installed at the bottom of the connecting plate, the driving rod is driven to rotate and the cutting unit is driven to operate by the driving component.

[0007] Preferably, the cleaning assembly includes a cleaning rod fixed to the top of the driving rod, a shovel plate that fits the curved surface of the conical cover is fixed on the cleaning rod, a track ring is fixed to the outer side of the conical cover through a fixing block, and a sliding seat that fits the track ring is fixed on the cleaning rod.

[0008] Preferably, an annular opening is provided at the bottom of the inner tube, and a U-shaped plate is fixed to the inner wall of the annular opening, a rotating ring is slidably inserted in the annular opening, a rotating cap is rotatably installed on the top of the inner tube, and a blowing component for cleaning the adsorbed plastic bag on the conical cover is installed on the rotating ring and the rotating cap.

[0009] Preferably, the blowing assembly includes a supporting tube fixedly connected to the rotating ring and a docking tube fixedly connected to the rotating cap, the supporting tube and the docking tube are both provided with one-way valves for one-way discharge of gas in the inner tube, and the rotating ring and the rotating cap are both provided with one-way valves for one-way flow of external gas into the inner tube, a blowing tube is fixedly connected between the docking tube and the supporting tube, the blowing tube is in contact with the inner wall of the conical cover, and a plurality of blowing holes are equally spaced on the outside of the blowing tube, the driving rod is located on the outer walls of the rotating ring and the rotating cap and is engraved with a reciprocating threaded groove, and a piston plate is threadedly sleeved on the outer side of the driving rod, and a limit strip slidingly docked with the piston plate is fixed on the inner wall of the inner tube.

[0010] Preferably, a support sleeve is rotatably sleeved on the outer side of the inner tube, and a support frame fixed to the blowing tube is fixed on the support sleeve.

[0011] Preferably, the cutting unit includes a receiving ring, the bottom of the inner barrel is designed to be in the shape of an inner concave ring, and the inner side of the receiving ring is rotatably docked with the inner concave ring through a bearing, and the outer ring surface of the receiving ring is in contact with the inner wall of the outer barrel, an inner gear ring connected to the driving assembly is fixed on the inner side of the receiving ring, and a cutting assembly is fixed on the outer wall of the inner barrel, the cross-sectional shape of the receiving ring is a trapezoid, and a rubber sheet in contact with the surface of the receiving ring is fixed to the bottom of the guide plate.

[0012] Preferably, the cutting assembly includes a mounting plate fixed on the outer wall of the inner barrel, a plug rod is slidably inserted on the mounting plate, a cutting blade is fixed on the top of the plug rod, a limiting plate is fixed on the bottom, an extrusion spring is sleeved on the outer side of the plug rod and abuts against the limiting plate and the mounting plate, a linkage shaft is fixed on the limiting plate, a plurality of trapezoidal blocks matching the linkage shaft are fixed at equal intervals on the receiving ring, and an arc groove matching the cutting blade is opened on the receiving ring.

[0013] Preferably, the driving assembly includes a driving motor fixed to the bottom of the connecting plate, a driving gear is fixed to the output end of the driving motor, and a transmission gear meshing with the driving gear is fixed to the outer side of the driving rod, a rotating shaft is fixed to the connecting plate, and linkage gears are fixed to the outer sides of the rotating shaft and the driving rod, a toothed belt is meshed between the two linkage gears, a docking port is provided on the inner barrel, and a driving gear is fixed on the rotating shaft, the driving gear is located in the docking port and meshed with the inner gear ring.

[0014] Preferably, the top of the connecting plate is a sloped structure to facilitate sewage discharge, and the connecting piece is an arc-shaped piece to prevent the plastic bag from falling directly to the front end of the guide plate.

[0015] A sewage filtration treatment method, applied to a sewage filtration treatment device, comprises the following steps;

[0016] S1. First, the sewage contacts the conical cover above the inner barrel through the inner buckle ring above the outer barrel. Under the action of the retaining ring, small particles in the sewage enter the inner barrel through the conical cover, and the plastic bag is attached to the conical cover.

[0017] S2, cleaning the plastic bag attached to the conical cover by means of a cleaning component, so that the plastic bag falls onto the cutting unit between the inner barrel and the outer barrel;

[0018] S3, cutting the plastic bag through the cutting unit, and discharging the cut plastic bag and the inner material through the discharge port.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention improves the traditional sewage treatment equipment. After the plastic bag is attached, internal air blowing is used to create a gap between the plastic bag and the conical cover, and the plastic bag is scooped up and pushed with a shovel, so that the plastic bag attached to the conical cover can be effectively cleaned without affecting the normal drainage and filtration of sewage. At the same time, the fallen plastic bag will be cut open by the cutting unit, so that the plastic bag and the internal particles can be separated for easy discharge and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the outer barrel of the present invention after partial cross-section;

[0023] Figure 3 It is a schematic diagram of the internal structure of the outer barrel and the inner barrel of the present invention after partial cross-section;

[0024] Figure 4 It is a side view of the outer barrel and the inner barrel of the present invention after partial section;

[0025] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 This is a schematic diagram of the structure of the present invention after removing the outer barrel;

[0027] Figure 7 This is a schematic diagram of the structure of the bottom drive assembly of the outer barrel of the present invention;

[0028] Figure 8 This is a schematic diagram of the cleaning component structure of the present invention;

[0029] Fig. 9 It is a schematic diagram of the docking of the driving assembly and the cutting unit of the present invention.

[0030] In the figure: 1, inner barrel; 2, outer barrel; 3, connecting piece; 4, conical cover; 5, inner buckle ring; 6, retaining ring; 7, inner tube; 8, connecting plate; 9, driving rod; 10, cleaning assembly; 11, cutting unit; 12, discharge port; 13, guide plate; 14, driving assembly; 15, cleaning rod; 16, shovel plate; 17, track ring; 18, slide seat; 19, annular mouth; 20, U-shaped plate; 21, rotating ring; 22, rotating cap; 23, blowing assembly; 24, support pipe; 25, Butt joint pipe; 26. Blow pipe; 27. Piston plate; 28. Limit strip; 29. ​​Support sleeve; 30. Support frame; 31. Receiver ring; 32. Inner gear ring; 33. Cutting assembly; 34. Mounting plate; 35. Insert rod; 36. Cutting disc; 37. Limit plate; 38. Extrusion spring; 39. Linkage shaft; 40. Trapezoidal block; 41. Drive motor; 42. Drive gear; 43. Transmission gear; 44. Linkage gear; 45. Toothed belt; 46. Docking port; 47. Drive gear. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figure 1 - Figure 5 and Figure 8 , a sewage filtering and treating device shown in the figure comprises an inner barrel 1 and an outer barrel 2, the inner barrel 1 and the outer barrel 2 are fixed by a connecting piece 3, and also comprises a conical cover 4 fixed on the top of the inner barrel 1 and an inner buckle 5 fixed on the top of the outer barrel 2, the arc surface of the conical cover 4 is a screen structure, and a retaining ring 6 is fixed on the outer side of the conical cover 4; and an inner tube 7, the outer side of the inner tube 7 is fixed to the inner wall of the inner barrel 1 by a connecting plate 8, a driving rod 9 is installed in the inner tube 7, the top of the driving rod 9 rotates through the conical cover 4, and a cleaning assembly 10 for cleaning plastic bags is fixed; and a cutting unit 11 installed between the inner barrel 1 and the outer barrel 2, the cutting of the plastic bags is realized by the cutting unit 11, the outer barrel 2 is provided with a discharge port 12 at the cutting unit 11, and a guide plate 13 is fixed in the discharge port 12; and a driving assembly 14 installed at the bottom of the connecting plate 8, the driving rod 9 is driven to rotate and the cutting unit 11 is driven to operate by the driving assembly 14;

[0033] In this solution, the conical cover 4 on the inner barrel 1 and the inner buckle 5 on the outer barrel 2 are designed to cooperate with each other, so as to guide the sewage to the conical cover 4 for filtration. At the same time, some large debris such as leaves and paper shells will move downward due to the inclined arc surface of the conical cover 4 until they fall onto the cutting unit 11 between the inner barrel 1 and the outer barrel 2, and are discharged through the discharge port 12 after being cut. Some debris such as plastic bags may be attached to the conical cover 4. The designed cleaning component 10 can actively push them outward for discharge. After cutting with the cutting unit 11, the internal debris and the plastic bags are discharged together, thereby preventing the plastic bags from clogging the screen on the conical cover 4 and affecting normal drainage.

[0034] For further information, see Figure 6 and Figure 8 The cleaning assembly 10 includes a cleaning rod 15 fixed to the top of the driving rod 9, a shovel plate 16 that fits the arc surface of the conical cover 4 is fixed to the cleaning rod 15, a track ring 17 is fixed to the outer side of the conical cover 4 through a fixing block, and a slide seat 18 that fits the track ring 17 is fixed to the cleaning rod 15;

[0035] It should be noted that: by the rotation of the driving rod 9, the cleaning rod 15 is rotated, thereby driving the shovel plate 16 to rotate along the conical cover 4, so that plastic bags and other debris attached to the conical cover 4 can be scooped up and pushed for easy discharge. At the same time, the design of the track ring 17, in addition to improving the stability of the movement of the cleaning rod 15, can also prevent some plastic bags and other foreign objects from being attached to the conical cover 4 over a large area, thereby facilitating scooping and pushing.

[0036] For further information, see Figure 2 , Figure 4 - Figure 6 as well as Fig. 9 The cutting unit 11 includes a receiving ring 31. The bottom of the inner barrel 1 is designed to be an inner concave ring shape. The inner side of the receiving ring 31 is rotatably connected to the inner concave ring through a bearing. The outer ring surface of the receiving ring 31 fits with the inner wall of the outer barrel 2. An inner gear ring 32 connected to the driving assembly 14 is fixed to the inner side of the receiving ring 31. A cutting assembly 33 is fixed on the outer wall of the inner barrel 1. The cross-sectional shape of the receiving ring 31 is a trapezoid, that is, the surface is an arc-shaped surface inclined outward. A rubber sheet that fits with the surface of the receiving ring 31 is fixed at the bottom of the guide plate 13. The rubber sheet fits with the surface of the receiving ring 31 to achieve mutual contact with debris. At the same time, the inclined guide plate 13 also facilitates the outflow of debris.

[0037] The cutting assembly 33 includes a mounting plate 34 fixed on the outer wall of the inner barrel 1, a plug rod 35 is slidably inserted on the mounting plate 34, a cutting blade 36 is fixed on the top of the plug rod 35, and the cutting blade 36 can be set as two pieces, and the contact end with the debris is an inclined surface. The debris is cut by shaking the cutting blade 36 up and down. A limit plate 37 is fixed at the bottom, and an extrusion spring 38 that abuts against the limit plate 37 and the mounting plate 34 is sleeved on the outer side of the plug rod 35. A linkage shaft 39 is fixed on the limit plate 37, and a plurality of trapezoidal blocks 40 that are compatible with the linkage shaft 39 are fixed on the receiving ring 31 at equal intervals. An arc groove that is compatible with the cutting blade 36 is opened on the receiving ring 31;

[0038] The process of the cutting unit 11 processing the debris:

[0039] First, some debris is directly blocked by the conical cover 4 and falls onto the receiving ring 31 between the inner barrel 1 and the outer barrel 2 through the inclined surface, while other debris is shoveled away from the conical cover 4 by the rotating shovel plate 16 and falls onto the receiving ring 31;

[0040] Afterwards, the inner gear ring 32 is driven to rotate by the driving assembly 14, so that the receiving ring 31 rotates accordingly. The receiving ring 31 rotates accordingly and drives the debris on its surface to pass through the cutting assembly 33. After the debris passes through the cutting assembly 33, it is cut. After the plastic bag is cut, the particles inside are exposed.

[0041] Afterwards, the receiving ring 31 continues to rotate, pushing the cut debris to contact the guide plate 13 , and then guides the debris into the discharge port 12 through the guide plate 13 for discharge.

[0042] Among them, when the receiving ring 31 rotates, it will drive several trapezoidal blocks 40 to contact the linkage shaft 39 in turn, and drive the linkage shaft 39 to move up along the inclined plane first, accumulate force through the extrusion spring 38, and then when the trapezoidal block 40 falls off, the extrusion spring 38 drives the cutting blade 36 to move down quickly to cut the debris.

[0043] It should also be noted that: in order to facilitate the flow of sewage in the inner barrel 1, the top of the connecting plate 8 is a sloped structure for easy sewage discharge. In order to facilitate the cutting of debris between the inner barrel 1 and the outer barrel 2 when they fall, the connecting piece 3 is an arc-shaped piece. The arc-shaped connecting piece 3 is used to guide and prevent plastic bags and other debris from falling directly to the front end of the guide plate 13.

[0044] For further information, see Figure 7 and Fig. 9The driving assembly 14 includes a driving motor 41 fixed to the bottom of the connecting plate 8, a driving gear 42 is fixed to the output end of the driving motor 41, a transmission gear 43 meshing with the driving gear 42 is fixed to the outer side of the driving rod 9, a rotating shaft is fixed to the connecting plate 8, and a linkage gear 44 is fixed to the outer sides of the rotating shaft and the driving rod 9, and a toothed belt 45 is meshed between the two linkage gears 44, a docking port 46 is opened on the inner barrel 1, and a driving gear 47 is fixed on the rotating shaft, and the driving gear 47 is located in the docking port 46 and meshes with the inner gear ring 32;

[0045] The driving assembly 14 drives the driving rod 9 to rotate and the cutting unit 11 to operate on the principle that: first, the driving motor 41 is operated to drive the driving gear 42 to rotate, and under the action of the transmission gear 43, the driving rod 9 rotates synchronously, and at the same time drives one of the linkage gears 44 to rotate, and under the action of the two linkage gears 44 and the toothed belt 45, the rotating shaft and the driving gear 47 follow the rotation, thereby driving the inner gear ring 32 to rotate, causing the receiving ring 31 to rotate, and causing the cutting unit 11 to start operating.

[0046] In this scheme, a sewage filtration treatment method includes the following steps:

[0047] S1. First, the sewage contacts the conical cover 4 above the inner barrel 1 through the inner buckle ring 5 above the outer barrel 2. Under the action of the retaining ring 6, the small particles in the sewage enter the inner barrel 1 through the conical cover 4, and the plastic bag is attached to the conical cover 4.

[0048] S2, cleaning the plastic bag attached to the conical cover 4 by means of the cleaning assembly 10, so that the plastic bag falls onto the cutting unit 11 between the inner barrel 1 and the outer barrel 2;

[0049] S3, cutting the plastic bag through the cutting unit 11, and discharging the cut plastic bag and the inner material through the discharge port 12.

[0050] Example 2: Please refer to Figure 8 This embodiment further explains the first embodiment. The difference lies in that the shape of the inner tube 7 is optimized and a blowing component 23 structure is added, so that some tightly attached plastic bags can be easily shoveled away.

[0051] Specifically, an annular opening 19 is provided at the bottom of the inner tube 7, and a U-shaped plate 20 is fixed to the inner wall of the annular opening 19. The design of the U-shaped plate 20 enables the inner tube 7 to maintain a stable fixed state after the annular opening 19 is opened. A rotating ring 21 is slidably inserted in the annular opening 19, and a rotating cap 22 is rotatably installed on the top of the inner tube 7. A blowing component 23 for cleaning the adsorbed plastic bag on the conical cover 4 is installed on the rotating ring 21 and the rotating cap 22;

[0052] Among them, the blowing assembly 23 includes a supporting tube 24 fixedly connected to the rotating ring 21 and a docking tube 25 fixedly connected to the rotating cap 22, and a one-way valve for one-way discharge of gas in the inner tube 7 is installed in the supporting tube 24 and the docking tube 25, and a one-way valve for one-way flow of external gas into the inner tube 7 is installed on the rotating ring 21 and the rotating cap 22, and a blowing tube 26 is fixedly connected between the docking tube 25 and the supporting tube 24, and the blowing tube 26 is in contact with the inner wall of the conical cover 4, and a plurality of blowing holes are evenly spaced on the outside of the blowing tube 26, and a reciprocating thread groove is engraved on the outer wall of the rotating ring 21 and the rotating cap 22, and a piston plate 27 is threadedly sleeved on the outer side of the driving rod 9, and a limit strip 28 is fixed on the inner wall of the inner tube 7 for sliding docking with the piston plate 27.

[0053] In this solution, when the driving rod 9 rotates, it will drive the piston plate 27 on its outer side to move up and down reciprocatingly. The up and down movement of the piston plate 27 enables the upper part of the gas in the inner tube 7 to be squeezed into the docking tube 25, and the lower part of the gas to be squeezed into the support tube 24. Finally, air is blown outward through the blowing tube 26 toward the conical cover 4, so as to blow away the plastic bags and debris attached to the conical cover 4, making it easier for the shovel plate 16 to shovel them away.

[0054] It should also be noted that the one-way valve installed in the support tube 24 and the docking tube 25 can be used for the one-way flow of gas in the inner tube 7 into the support tube 24 and the docking tube 25, thereby being used for blowing, while the gas in the support tube 24 and the docking tube 25 cannot flow back into the inner tube 7. Similarly, the one-way valve installed on the rotating ring 21 and the rotating cap 22 can only allow external gas to flow into the inner tube 7 in one direction, while the gas in the inner tube 7 cannot be discharged outward through the one-way valve.

[0055] Example 3: Please refer to Figure 8 This embodiment further illustrates other embodiments, and the difference lies in that the structure of the blowing component 23 is optimized so that the rotation of the blowing pipe 26 is more stable.

[0056] The outer side of the inner tube 7 is rotatably sleeved with a support sleeve 29, on which a support frame 30 fixed to the air blowing tube 26 is fixed. The design of the support sleeve 29 makes the air blowing tube 26 and the support tube 24 more stable when the driving rod 9 drives the docking tube 25 to rotate.

[0057] 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.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage filtration treatment device, comprising: An inner barrel (1) and an outer barrel (2), wherein the inner barrel (1) and the outer barrel (2) are fixed via a connecting piece (3); It is characterized by further comprising: A conical cover (4) fixed on the top of the inner barrel (1) and an inner buckle ring (5) fixed on the top of the outer barrel (2), wherein the arc surface of the conical cover (4) is a screen structure, and a retaining ring (6) is fixed on the outer side of the conical cover (4); and, An inner tube (7), the outer side of the inner tube (7) is fixed to the inner wall of the inner barrel (1) via a connecting plate (8), and a driving rod (9) is rotatably mounted in the inner tube (7) via a bearing, the top of the driving rod (9) rotatably penetrates the conical cover (4) and is fixed with a cleaning assembly (10) for cleaning plastic bags; and, A cutting unit (11) is installed between the inner barrel (1) and the outer barrel (2), and the plastic bag is cut by the cutting unit (11). The outer barrel (2) is provided with a discharge port (12) at the cutting unit (11), and a guide plate (13) is fixed inside the discharge port (12); and, The driving assembly (14) installed at the bottom of the connecting plate (8) drives the driving rod (9) to rotate and drives the cutting unit (11) to operate.

2. A sewage filtration treatment device according to claim 1, characterized in that: The cleaning assembly (10) comprises a cleaning rod (15) fixed to the top of the driving rod (9), a shovel plate (16) fitted with the arc surface of the conical cover (4) is fixed on the cleaning rod (15), a track ring (17) is fixed to the outer side of the conical cover (4) through a fixing block, and a slide seat (18) fitted with the track ring (17) is fixed on the cleaning rod (15).

3. A sewage filtration treatment device according to claim 1, characterized in that: The bottom of the inner tube (7) is provided with an annular opening (19), and a U-shaped plate (20) is fixed to the inner wall of the annular opening (19). A rotating ring (21) is slidably inserted in the annular opening (19), and a rotating cap (22) is rotatably installed on the top of the inner tube (7). A blowing component (23) for cleaning the adsorbed plastic bag on the conical cover (4) is installed on the rotating ring (21) and the rotating cap (22).

4. A sewage filtration treatment device according to claim 3, characterized in that: The blowing assembly (23) comprises a support tube (24) fixedly connected to the rotating ring (21) and a butt joint tube (25) fixedly connected to the rotating cap (22), wherein both the support tube (24) and the butt joint tube (25) are provided with a one-way valve for one-way discharge of gas in the inner tube (7), and both the rotating ring (21) and the rotating cap (22) are provided with a one-way valve for one-way flow of external gas into the inner tube (7), wherein the butt joint tube (25) and the support tube ( A blow pipe (26) is fixedly connected between the inner tube (24), the blow pipe (26) is in contact with the inner wall of the conical cover (4), and a plurality of blow holes are evenly spaced on the outer side of the blow pipe (26), the drive rod (9) is located on the outer wall of the rotating ring (21) and the rotating cap (22) and is engraved with a reciprocating thread groove, and a piston plate (27) is threadedly sleeved on the outer side of the drive rod (9), and a limit strip (28) is fixed on the inner wall of the inner tube (7) and is slidably connected to the piston plate (27).

5. A sewage filtration treatment device according to claim 4, characterized in that: A support sleeve (29) is rotatably sleeved on the outer side of the inner tube (7), and a support frame (30) fixed to the air blowing tube (26) is fixed on the support sleeve (29).

6. A sewage filtration treatment device according to claim 1, characterized in that: The cutting unit (11) comprises a receiving ring (31), the bottom of the inner barrel (1) is designed to be in the shape of an inner concave ring, and the inner side of the receiving ring (31) is rotatably connected to the inner concave ring through a bearing, and the outer ring surface of the receiving ring (31) is in contact with the inner wall of the outer barrel (2), the inner side of the receiving ring (31) is fixed with an inner gear ring (32) in contact with the driving assembly (14), and the cutting assembly (33) is fixed on the outer wall of the inner barrel (1), the cross-section of the receiving ring (31) is trapezoidal, and the bottom of the guide plate (13) is fixed with a rubber sheet in contact with the surface of the receiving ring (31).

7. A sewage filtration treatment device according to claim 6, characterized in that: The cutting assembly (33) comprises a mounting plate (34) fixed on the outer wall of the inner barrel (1), a plug rod (35) is slidably inserted on the mounting plate (34), a cutting blade (36) is fixed on the top of the plug rod (35), and a limiting plate (37) is fixed on the bottom, an extrusion spring (38) is sleeved on the outer side of the plug rod (35) and is abutted against the limiting plate (37) and the mounting plate (34), and a linkage shaft (39) is fixed on the limiting plate (37), a plurality of trapezoidal blocks (40) adapted to the linkage shaft (39) are fixed at equal intervals on the receiving ring (31), and an arc groove adapted to the cutting blade (36) is provided on the receiving ring (31).

8. A sewage filtration treatment device according to claim 6, characterized in that: The driving assembly (14) comprises a driving motor (41) fixed to the bottom of the connecting plate (8), a driving gear (42) being fixed to the output end of the driving motor (41), and a transmission gear (43) meshing with the driving gear (42) being fixed to the outer side of the driving rod (9), a rotating shaft being fixed to the connecting plate (8), and linkage gears (44) being fixed to the outer sides of the rotating shaft and the driving rod (9), a toothed belt (45) being meshed between the two linkage gears (44), a docking port (46) being provided on the inner barrel (1), and a driving gear (47) being fixed to the rotating shaft, the driving gear (47) being located in the docking port (46) and meshing with the inner gear ring (32).

9. A sewage filtration treatment device according to claim 1, characterized in that: The top of the connecting plate (8) is a sloped structure to facilitate sewage discharge, and the connecting piece (3) is an arc-shaped piece to prevent the plastic bag from falling directly to the front end of the guide plate (13).

10. A sewage filtration treatment method, applied to a sewage filtration treatment device according to any one of claims 1 to 9, characterized in that: The steps include: S1. First, the sewage contacts the conical cover (4) above the inner barrel (1) through the inner buckle ring (5) above the outer barrel (2). Under the action of the retaining ring (6), small particles in the sewage pass through the conical cover (4) and enter the inner barrel (1). The plastic bag is attached to the conical cover (4). S2, cleaning the plastic bag attached to the conical cover (4) by means of the cleaning assembly (10) so that the plastic bag falls onto the cutting unit (11) between the inner barrel (1) and the outer barrel (2); S3, cutting the plastic bag through the cutting unit (11), and discharging the cut plastic bag and the contents through the discharge port (12).

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