Sewage deep filtering and automatic cleaning device

Abstract

The invention discloses an automatic cleaning device for deep filtration of sewage, which comprises a cylindrical filter cartridge, an input end cover and an output end cover are arranged at two ends of the cylindrical filter cartridge, and a front filter element and an epoxy seal head embedded with an ultrafiltration membrane wire are respectively arranged on a mounting ring seat at the center in the cartridge and are fixed through a stud. An output pipe connected with the output end cover is provided with a pressure sensor and connected with a cleaning assembly, the cleaning assembly is provided with a flushing pipe and a water pump, a connecting plate connected with a deflector rod is arranged in the ultrafiltration membrane silk, a cam on one side of the cleaning assembly is connected with a cross sleeved with a turbofan through a rotating shaft, and a one-way ratchet wheel assembly is arranged on one side of the cross. During working, sewage is filtered by the front filter element and the ultrafiltration membrane wire and then discharged, the pressure sensor monitors pressure, when the pressure is abnormal, the automatic control unit closes the input valve and the output valve, opens the waste liquid valve and starts the water pump to clean the ultrafiltration membrane wire, and normal filtration is recovered after cleaning. The sewage treatment quality and efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an automatic sewage deep filtering and cleaning device. Background Art

[0002] In today's society, the process of industrialization and urbanization is accelerating, and the amount of sewage generated is showing a rapid growth trend. Sewage treatment has become an important issue concerning environmental protection, ecological balance and human health. Traditional sewage filtration technology has gradually exposed many shortcomings under such a background. Many traditional filtration devices adopt a relatively simple and crude filter element structure, which is incapable of dealing with complex and changeable sewage components. Sewage often contains a large number of impurities of different particle sizes, from larger suspended solids to tiny colloidal particles. It is difficult for a single filter element to effectively layer these impurities, resulting in large particle impurities easily and quickly accumulating on the surface of the filter element to form a blockage layer, which greatly hinders the normal filtration of subsequent sewage and causes the filtration efficiency to drop sharply in a short period of time, which cannot meet the actual needs of large-scale and high-efficiency sewage treatment.

[0003] Traditional filtration devices face many difficulties in cleaning the filter element. Once the filter element is blocked, existing cleaning methods often make it difficult to completely remove the dirt inside and on the surface of the filter element. Some commonly used cleaning methods, such as simple backwashing, can only remove some impurities that are loosely attached to the surface of the filter element. For dirt that penetrates deep into the pores of the filter element and is tightly bound to the surface of the filter element, the cleaning effect is very limited. Although chemical cleaning can solve some stubborn dirt problems to a certain extent, the use of chemical agents not only increases the processing cost, but may also cause corrosion or other damage to the filter element material itself, further shortening the service life of the filter element. At the same time, due to the limitations of the structure of traditional filtration devices, its filtration depth is difficult to be effectively improved. For those tiny bacteria, viruses, soluble organic matter and other harmful substances in sewage, it is impossible to intercept and remove them efficiently and accurately, resulting in the difficulty of the treated sewage water quality to reach higher standards, limiting the reuse of sewage, such as industrial reuse water, landscape water and other applications.

[0004] From the perspective of automated control, traditional sewage filtration devices generally have the problem of low automation. In the actual operation process, most of them rely on manual inspection and judgment of the blockage of the filter element on a regular basis. This manual monitoring method has many disadvantages. On the one hand, the frequency of manual inspection is difficult to accurately control. Too long inspection intervals may cause excessive blockage of the filter element and damage the equipment. Too short intervals will waste a lot of manpower and material resources. On the other hand, manual judgment of the degree of blockage of the filter element is often based on subjective experience, lacks accurate quantitative basis, and is prone to misjudgment. Moreover, after determining that the filter element needs to be cleaned, manually starting the cleaning procedure will also result in operational delays and irregular operations. These have seriously affected the operating efficiency and stability of the sewage treatment device, and it is difficult to adapt to the development requirements of modern society for efficient and intelligent sewage treatment. Summary of the invention

[0005] The present invention relates to an automatic sewage deep filtration and cleaning device, which aims to solve the problems that filter elements are easily blocked and inconvenient to clean during sewage filtration, as well as the low degree of automation of traditional filtration devices, so as to achieve efficient, stable and automatic sewage deep filtration and filter element cleaning operations.

[0006] The device mainly includes a filter cartridge, an end cover, a filter element assembly, and a cleaning assembly. The filter cartridge is cylindrical and hollow, and an input end cover and an output end cover are respectively provided at both ends thereof, which are used to close the filter cartridge and connect related pipelines. A mounting ring seat is provided at the center of the inner wall of the filter cartridge, and a ring sleeve is provided at one end of the mounting ring seat near the input end cover, and a pre-filter element is embedded in the ring sleeve. The pre-filter element can perform preliminary filtration on the sewage, intercept larger particle impurities, reduce the filtration burden of the subsequent ultrafiltration membrane filaments and extend their service life. An epoxy seal is provided at one end of the mounting ring seat near the output end cover, in which a number of ultrafiltration membrane filaments are embedded. The ultrafiltration membrane filaments can perform deep filtration on the sewage, remove micro-pollutants, microorganisms and other harmful substances, and further purify the sewage. The mounting ring seat is fixed by a plurality of stud bolts, and the two ends of the stud bolts slide through the epoxy seal and the ring sleeve, and nuts are threadedly sleeved at both ends, and the nuts are tightly abutted against the epoxy seal and the side wall of the ring sleeve to ensure the stability of the installation of the filter element assembly.

[0007] Furthermore, the output end cover is coaxially connected to an output pipe for discharging the purified water after filtration, and a pressure sensor is installed on the output pipe to monitor the pressure in the pipe in real time. The output pipe is also connected to a cleaning assembly, which includes a flushing pipe connected to the output pipe, and a water pump is connected to the input end of the flushing pipe. A number of levers are horizontally embedded inside the ultrafiltration membrane wire, and the ends of the levers are connected to the same connecting plate. Two pressure blocks are symmetrically arranged on the side of the connecting plate away from the lever, and a cam is arranged between the pressure blocks. A rotating shaft is inserted laterally into the cam, and a cross is arranged on the rotating sleeve of the rotating shaft. The cross is fixed to the inner wall of the output end cover, and a turbofan is arranged on the outer peripheral surface of the rotating shaft near the position between the cross and the cam, and a one-way ratchet assembly is arranged on the side of the cross away from the turbofan. The one-way ratchet assembly consists of a rotating block symmetrically arranged on the outer peripheral surface of the end of the rotating shaft and two one-way blocks symmetrically arranged on the side of the cross away from the turbofan. The one-way block is rotatably connected to the cross and an automatic reset torsion spring is installed at the hinge point. The end of the one-way block and the end of the rotating block are both curved on one side and flat on the other side. When the rotating block rotates, its curved surface abuts against the curved surface of the one-way block. When the rotating block is stationary, its flat surface abuts against the flat surface of the one-way block. A stopper is laterally provided on the side of the one-way block close to its curved surface, and the stopper is fixed to the side wall of the cross. The one-way ratchet assembly restricts or allows the rotation of the rotating shaft in different states, ensuring the coordinated work of various components of the device during normal filtering and cleaning. Slide rods are symmetrically inserted and slidably provided at the upper and lower ends of the connecting plate. The ends of the slide rods are connected to the inner wall of the filter cartridge. The slide rods are sleeved with compression springs to provide auxiliary support and reset functions for the up and down swinging of the connecting plate.

[0008] Furthermore, the input end cap is connected to an input pipe for introducing sewage, the input pipe is connected to a waste liquid pipe, the end of the waste liquid pipe is connected to a waste liquid valve, the end of the input pipe is also connected to an input valve, and the end of the output pipe is connected to an output valve. These valves are opened or closed to control the direction and on-off of the water flow in different working stages of the device, such as filtering, cleaning, and waste liquid discharge, so as to realize the switching of multiple functions and automatic operation of the device.

[0009] Furthermore, sewage enters the filter cartridge from the input pipe, is initially filtered by the pre-filter element, and then is deeply filtered by the ultrafiltration membrane before being discharged through the output pipe. The pressure sensor monitors the pressure in the output pipe in real time and transmits data. When the pressure is lower than the preset threshold, it indicates that the ultrafiltration membrane may be blocked. At this time, the automatic control unit starts the automatic cleaning program. The automatic control unit first closes the input valve and the output valve, opens the waste valve at the same time, and then starts the water pump. The water pump pumps water into the output pipe through the flushing pipe and enters the filter cartridge. The water pressure drives the turbofan to drive the shaft to rotate. Since it is in the cleaning state at this time, the reversal of the shaft is not restricted by the one-way ratchet assembly, which in turn drives the cam to rotate. The cam squeezes the pressure block to make the connecting plate and the lever swing up and down regularly. The lever fiddles with the ultrafiltration membrane to clean it, and the sewage generated by the cleaning is discharged through the waste pipe. After the cleaning is completed, the automatic control unit first turns off the water pump, then turns off the waste valve and opens the input valve and output valve to resume normal filtering. In addition, when the filtering effect deteriorates, the pre-filter element or ultrafiltration membrane filament can be replaced as needed. The pre-filter element can be disassembled and replaced by loosening the stud bolts and nuts, while the ultrafiltration membrane filament needs to be replaced after removing the output end cover and other components.

[0010] The sewage deep filtration automatic cleaning device of the present invention not only improves the effect and efficiency of sewage filtration through the ingenious design and coordinated work of various components, but also realizes the automatic cleaning function when the filter element is blocked, and has a certain convenience in replacing the filter element, effectively improving the practicality and automation level of the entire device, and has good application prospects and promotion value in the field of sewage treatment.

[0011] Beneficial effects of the present invention: 1. The sewage deep filtration automatic cleaning device of the present invention has excellent filtration performance and stable operating characteristics. It adopts a two-stage filtration structure combining a pre-filter element and an ultrafiltration membrane. The pre-filter element can first intercept large particles of impurities in the sewage, such as gravel, fiber, etc., effectively reducing the filtration burden of the subsequent ultrafiltration membrane, preventing the ultrafiltration membrane from being quickly blocked due to excessive accumulation of large particles, and significantly extending the service life of the ultrafiltration membrane, thereby reducing the cost and downtime caused by frequent replacement of the filter element, ensuring that the device can operate stably for a long time and continuously and efficiently treat sewage. At the same time, this graded filtration mode can perform targeted filtration according to the particle size of different impurities, greatly improving the overall filtration efficiency, so that the sewage can be purified more thoroughly, and laying a solid foundation for the subsequent reuse of water resources or standard discharge.

[0012] 3. The automatic cleaning function of the device is a highlight. The water flow pressure is monitored in real time through the pressure sensor on the output pipe. When the pressure is lower than the preset threshold, the automatic control unit responds quickly and starts the cleaning program accurately. During the cleaning process, the water pressure is cleverly used to drive the turbofan to rotate, which in turn drives the shaft, cam and other components to work together, so that the lever inside the ultrafiltration membrane wire swings regularly, and the ultrafiltration membrane wire is gently and effectively fiddled with, simulating the manual cleaning action, and efficiently removing dirt and impurities on the surface and pores of the membrane wire. This intelligent cleaning method not only avoids the chemical damage that traditional chemical cleaning may cause to the ultrafiltration membrane wire, and the problem of poor effect of simple water flushing, but also can accurately start in time when cleaning is needed, so that the filtration performance of the ultrafiltration membrane wire can be quickly restored, ensuring that the device always maintains a high filtration efficiency throughout the entire operation cycle, reducing the decline in processing capacity due to filter element blockage, and improving the utilization rate of the equipment and the continuity of sewage treatment.

[0013] 3. In terms of maintenance, the present invention shows great convenience. The replacement operation of the pre-filter element is simple and easy. You only need to loosen the nut on the stud bolt to easily disassemble the ring sleeve and the pre-filter element for replacement. No complicated tools or professional skills are required, which greatly reduces the difficulty and cost of maintenance. Although the replacement of ultrafiltration membrane filaments is relatively complicated, the structural design of the device also fully takes this into account. By rationally arranging the end caps, installing the ring seat and other components, when the ultrafiltration membrane filaments need to be replaced, maintenance personnel can perform disassembly and installation operations more conveniently. In addition, the device has a wide range of adaptability to sewage of different types and degrees of pollution. Whether it is various types of wastewater in industrial production or domestic sewage, it can be effectively filtered and purified. This good compatibility enables the device to be widely used in many fields, such as industrial parks, urban sewage treatment plants, residential areas, etc., providing reliable and flexible solutions for sewage treatment in different scenarios, and effectively promoting the popularization and application of sewage treatment technology in various industries, with significant social and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of a top view of the structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the filter cartridge according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the decomposition of the filtering structure of an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a cleaning component according to an embodiment of the present invention; Figure 6 For the embodiment of the present invention Figure 5 A schematic diagram of the enlarged local structure at A; Figure 7 For the embodiment of the present invention Figure 5 An enlarged schematic diagram of the local structure at location B.

[0016] The markings in the figure are: 1. Filter cartridge; 2. Input end cover; 3. Output end cover; 4. Mounting ring seat; 5. Ring sleeve; 6. Pre-filter element; 7. Stud bolts; 8. Nuts; 9. Epoxy head; 10. Ultrafiltration membrane wire; 11. Pressure sensor; 12. Output pipe; 13. Flushing pipe; 14. Water pump; 15. Output valve; 16. Input pipe; 17. Input valve; 18. Waste liquid pipe; 19. Waste liquid valve; 20. Cross; 21. Rotating shaft; 22. Turbofan; 23. Rotating block; 24. One-way block; 25. Stop rod; 26. Cam; 27. Pressure block; 28. Sliding rod; 29. ​​Compression spring; 30. Push rod; 31. Connecting plate. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0018] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0019] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0020] Example 1 See also Figures 1 to 7 1. Assembly and installation of the device Installation of filter cartridge and internal filter element assembly First, place the mounting ring seat 4 at the center of the inner wall of the cylindrical hollow filter cartridge 1. Put the ring sleeve 5 on the end of the mounting ring seat 4 close to the input end cover 2, and embed the pre-filter element 6 into the ring sleeve 5. Then install the epoxy head 9 on the end of the mounting ring seat 4 close to the output end cover 3, so that a number of ultrafiltration membrane filaments 10 are embedded in the epoxy head 9. Then insert a plurality of stud bolts 7 into the mounting ring seat 4 in an equidistant circular array, so that the two ends of the stud bolts 7 slide through the epoxy head 9 and the ring sleeve 5 respectively, and finally, thread nuts 8 on both ends of the stud bolts 7, and tighten the nuts 8 to make them tightly abut against the epoxy head 9 and the side wall of the ring sleeve 5, so as to fix the pre-filter element 6 and the ultrafiltration membrane filament 10 assembly.

[0021] Installation of end caps and connecting pipes The input end cover 2 is fixed to one end of the filter cartridge 1 by bolt connection or the like, and the input pipe 16 is connected to the input end cover 2, and the input valve 17 is installed at the end of the input pipe 16, and the waste liquid pipe 18 is connected to the input pipe 16, and the waste liquid valve 19 is installed at the end of the waste liquid pipe 18. The output end cover 3 is fixed to the other end of the filter cartridge 1, so that the output end cover 3 and the filter cartridge 1 are closely matched to ensure the sealing performance. The output pipe 12 is coaxially connected to the output end cover 3, and the output valve 15 is installed at the end of the output pipe 12, and the pressure sensor 11 is installed on the output pipe 12. Finally, the flushing pipe 13 is connected to the output pipe 12, and the water pump 14 is connected to the input end of the flushing pipe 13. The cross 20 is fixed on the inner wall of the output end cover 3, and the rotating shaft 21 passes through the cam 26 and is rotated and sleeved on the cross 20, and the turbofan 22 is sleeved on the outer peripheral surface of the rotating shaft 21 near the position between the cross 20 and the cam 26. A plurality of levers 30 are horizontally embedded inside the ultrafiltration membrane filament 10, so that the ends of the levers 30 are connected to the same connecting plate 31, and two pressing blocks 27 are symmetrically installed on the side of the connecting plate 31 away from the levers 30, so that the cam 26 is located between the two pressing blocks 27. A symmetrical rotating block 23 is installed on the outer peripheral surface of the end of the rotating shaft 21, and two one-way blocks 24 are installed on the side of the cross 20 away from the turbofan 22. The one-way blocks 24 are all rotatably connected to the cross 20 and a torsion spring for automatic reset is installed at the hinge point, so that the ends of the one-way blocks 24 and the ends of the rotating blocks 23 are both curved on one side and flat on the other side, and a stopper 25 is transversely installed on the side of the one-way block 24 close to its curved surface, and the stopper 25 is fixed to the side wall of the cross 20. Slide rods 28 are symmetrically inserted and slidably inserted at both ends of the connecting plate 31, so that the ends of the slide rods 28 are connected to the inner wall of the filter cartridge 1, and a compression spring 29 is sleeved on the slide rods 28.

[0022] 2. Sewage Filtration Working Process Open the input valve 17, and the sewage enters the filter cartridge 1 from the input pipe 16, and first passes through the pre-filter element 6 for preliminary filtration to intercept larger particles of impurities in the sewage. The sewage after preliminary filtration continues to flow to the ultrafiltration membrane filament 10, and the ultrafiltration membrane filament 10 performs secondary filtration on the sewage through its tiny membrane pores to remove smaller pollutants, microorganisms, etc., and the purified water after deep filtration is discharged through the output pipe 12. In this process, the pressure sensor 11 monitors the pressure in the output pipe 12 in real time and transmits the pressure data to the automatic control unit.

[0023] 3. Automatic cleaning process When the pressure sensor 11 detects that the pressure in the output pipe 12 is lower than the pressure threshold preset by the automatic control unit, the automatic control unit starts the automatic cleaning program. The automatic control unit first closes the input valve 17 and the output valve 15 at the same time, and opens the waste valve 19 to connect the inside of the filter cartridge 1 with the waste pipe 18, and then starts the water pump 14.

[0024] The water pump 14 pumps the external water source into the output pipe 12 through the flushing pipe 13, and then enters the filter cartridge 1. At this time, the water pressure generated by the water entering the filter cartridge drives the turbofan 22 to rotate, and the turbofan 22 drives the rotating shaft 21 to rotate. Since it is in the cleaning state at this time, the rotating shaft 21 is reversed, and the one-way block 24 and the rotating block 23 will not abut each other, and the turbofan 22 can smoothly drive the rotating shaft 21 to rotate.

[0025] The rotating shaft 21 drives the cam 26 to rotate, and the cam 26 continuously squeezes the two pressing blocks 27 during the rotation process. After the pressing blocks 27 are pressed, they drive the connecting plate 31 to swing up and down along the sliding rod 28 regularly. The lever 30 continuously fiddles with the ultrafiltration membrane filament 10 as the connecting plate 31 swings, simulating the action of the hand swinging the ultrafiltration membrane filament in the water, and shaking off the dirt and other impurities attached to the surface of the ultrafiltration membrane filament. The sewage generated during the cleaning process is discharged through the waste liquid pipe 18.

[0026] After cleaning is completed, the automatic control unit first turns off the water pump 14, stops supplying water to the filter cartridge 1, and then closes the waste liquid valve 19 to prevent the waste liquid from flowing back. Finally, the input valve 17 and the output valve 15 are opened to resume normal sewage filtering.

[0027] 4. Filter element replacement process Pre-filter replacement When the pre-filter element 6 needs to be replaced, the nuts 8 at both ends of the stud bolts 7 are manually loosened, and the ring sleeve 5 together with the pre-filter element 6 is removed from the stud bolts 7. Then the new pre-filter element 6 is inserted into the new ring sleeve 5 or the cleaned original ring sleeve, and the ring sleeve 5 is inserted into the stud bolts 7 again, and the nuts 8 are tightened to ensure that the pre-filter element 6 is firmly installed, and the replacement of the pre-filter element is completed.

[0028] Ultrafiltration membrane replacement If the ultrafiltration membrane filament 10 needs to be replaced, first remove the output end cover 3 from the filter cartridge 1, then remove the epoxy head 9 from the mounting ring seat 4, take out the old ultrafiltration membrane filament 10, install the new ultrafiltration membrane filament 10 into the epoxy head 9, then install the epoxy head 9 back into the mounting ring seat 4, and finally reinstall the output end cover 3 and connecting pipes and other components to complete the replacement of the ultrafiltration membrane filament.

[0029] Through the above specific implementation methods, the sewage deep filtration automatic cleaning device can effectively perform sewage deep filtration and automatically clean the filter element when it is blocked. The maintenance and replacement operations of key components are relatively convenient, which can ensure the long-term stable operation of the device and meet the needs of sewage treatment.

[0030] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sewage deep filtration automatic cleaning device, comprising a cylindrical hollow filter cartridge (1), wherein the filter cartridge (1) is provided with an input end cover (2) and an output end cover (3) at both ends, a mounting ring seat (4) is provided at the center of the inner wall of the filter cartridge (1), a ring sleeve (5) is provided at one end of the mounting ring seat (4) close to the input end cover (2), a pre-filter element (6) is embedded in the ring sleeve (5), an epoxy seal (9) is provided at one end of the mounting ring seat (4) close to the output end cover (3), and a plurality of The mounting ring seat (4) is provided with a plurality of stud bolts (7) in an equidistant circular array, and the two ends of the stud bolts (7) are respectively slidably inserted into the epoxy head (9) and the ring sleeve (5), and the two ends of the stud bolts (7) are threadedly provided with nuts (8), and the nuts (8) are respectively abutted against the side walls of the epoxy head (9) and the ring sleeve (5), and the output end cover (3) is coaxially connected with an output pipe (12), and the output pipe (12) is connected with a cleaning component for flushing the ultrafiltration membrane wire (10), characterized in that: The cleaning assembly comprises a flushing pipe (13) connected to an output pipe (12); the input end of the flushing pipe (13) is connected to a water pump (14); a plurality of levers (30) are horizontally embedded inside the ultrafiltration membrane wire (10); the ends of the levers (30) are connected to a same connecting plate (31); two pressing blocks (27) are symmetrically arranged on the side of the connecting plate (31) away from the lever (30); a cam (26) is arranged between the pressing blocks (27); a rotating shaft (21) is inserted transversely into the cam (26); a cross (20) is rotatably sleeved on the rotating shaft (21); the cross (20) is fixed to the inner wall of the output end cover (3); a turbofan (22) is sleeved on the outer circumference of the rotating shaft (21) near the position between the cross (20) and the cam (26); and a one-way ratchet assembly for limiting the rotation of the rotating shaft (21) is arranged on the side of the cross (20) away from the turbofan (22).

2. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: The one-way ratchet assembly comprises a rotating block (23) symmetrically arranged on the outer peripheral surface of the end of the rotating shaft (21), and the one-way ratchet assembly also comprises two one-way blocks (24) symmetrically arranged on the side of the cross (20) away from the turbofan (22). The one-way blocks (24) are both rotatably connected to the cross (20) and are both equipped with torsion springs for automatic reset at the hinge points. The ends of the one-way blocks (24) and the rotating blocks (23) are both curved on one side and flat on the other side. When the rotating block (23) rotates, its curved surface abuts against the curved surface of the one-way block (24). When the rotating block (23) is stationary, its flat surface abuts against the flat surface of the one-way block (24). The one-way blocks (24) are both transversely provided with a stopper (25) on the side close to their curved surfaces, and the stopper (25) is fixed to the side wall of the cross (20).

3. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: Slide rods (28) are symmetrically slidably inserted at both upper and lower ends of the connection plate (31), the ends of the slide rods (28) are connected to the inner wall of the filter cartridge (1), and the slide rods (28) are sleeved with compression springs (29).

4. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: The input end cover (2) is connected to an input pipe (16), the input pipe (16) is connected to a waste liquid pipe (18), and the end of the waste liquid pipe (18) is connected to a waste liquid valve (19).

5. The sewage deep filtration automatic cleaning device according to claim 4 is characterized in that: The end of the input pipe (16) is connected to an input valve (17).

6. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: The end of the output pipe (12) is connected to an output valve (15).

7. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: The output pipe (12) is equipped with a pressure sensor (11).

8. The sewage deep filtration automatic cleaning device according to claim 1 is characterized in that: The input end cover (2) and the output end cover (3) are both fastened to the filter cartridge (1) via bolts.

9. The sewage deep filtration automatic cleaning device according to claim 7, characterized in that: The automatic cleaning device further comprises an automatic control unit, the pressure sensor (11) being electrically connected to the automatic control unit, the automatic control unit being electrically connected to the water pump (14), the input valve (17), the output valve (15) and the waste liquid valve (19), the automatic control unit presetting a pressure threshold, when the pressure sensor (11) detects that the pressure in the output pipe (12) is lower than the threshold, the automatic control unit first closes the input valve (17) and the output valve (15), opens the waste liquid valve (19) at the same time, and then starts the water pump (14); after the cleaning is completed, the automatic control unit first closes the water pump (14), then closes the waste liquid valve (19) and opens the input valve (17) and the output valve (15) to resume normal filtering operation.

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