Reverse osmosis membrane sewage treatment device and sewage treatment method

Abstract

The invention relates to the technical field of sewage treatment devices, and discloses a reverse osmosis membrane sewage treatment device which comprises a tower body, a clean liquid discharge pipe mounted at the bottom of the tower body and a lower rotary drum rotationally communicated with the clean liquid discharge pipe, an upper rotary drum capable of periodically rotating by 90 degrees is mounted in the tower body, the upper rotary drum is linked with the lower rotary drum, a transmission system is arranged on the upper rotary drum, and the lower rotary drum is linked with the lower rotary drum. Two symmetrically-arranged treatment systems are installed on the upper rotary drum, each treatment system comprises a flow guide pipe fixedly communicated with the lower rotary drum and a bidirectional movement system driven by a transmission system, and a bidirectional movement frame capable of doing bidirectional reciprocating motion and a torsion shaft capable of alternately rotating forwards and backwards are installed on each bidirectional movement system in a transmission mode; and the reciprocating frequency and the reciprocating stroke of the two-way movement frame are circularly changed. A three-dimensional self-cleaning mechanism of mechanical stretching, air pressure pulse and magnetic field vibration on the reverse osmosis membrane is innovatively constructed, and the technical bottleneck that complex pollutants cannot be removed through traditional single axial cleaning is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment devices. More specifically, the present invention relates to a reverse osmosis membrane sewage treatment device and a sewage treatment method. Background Art

[0002] The principle of reverse osmosis technology is that under the action of a pressure higher than the osmotic pressure of the solution, other substances are separated from water based on the fact that they cannot pass through a semi-permeable membrane. The membrane pores of the reverse osmosis membrane are very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic substances, etc. in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process, and easy operation. When in use, the reverse osmosis membrane is usually installed in a sealed container cylinder for installation and use. In the prior art, a patent document with the publication number CN118791087B discloses a reverse osmosis membrane sewage treatment device, including a fixed bracket. A driving mechanism is provided on the fixed bracket. The driving mechanism is connected to a rotating rod. The rotating rod is fixedly connected to a driving gear. The driving gear is rotatably connected to a turntable. A first limiting member is provided between the driving gear and the turntable. When one of the reverse osmosis membrane installation components of the above device is working, the other non-working reverse osmosis membrane installation component moves to one side of the entire device, facilitating the removal of the unused reverse osmosis membrane for disassembly, cleaning, and maintenance. However, the above device has the following technical problems when in use: Most existing reverse osmosis membranes use single-axis cleaning or rely on chemical agents, and stubborn pollutants remaining on the membrane surface cannot be effectively removed. Long-term use leads to a decline in the sewage treatment effect of the reverse osmosis membrane; In the existing device, laminar flow is easily formed on the membrane surface, resulting in a serious concentration polarization phenomenon. Pollutants accumulate on the membrane surface to form a filter cake layer, significantly reducing the filtration efficiency; Based on this, the present invention provides a reverse osmosis membrane sewage treatment device and a sewage treatment method to solve the technical problems proposed in the above background art. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a reverse osmosis membrane sewage treatment device and a sewage treatment method. The present invention innovatively constructs a three-dimensional self-cleaning mechanism of "mechanical stretching, air pressure pulse, and magnetic field vibration" for the reverse osmosis membrane, solving the technical bottleneck that traditional single-axis cleaning cannot remove complex pollutants.

[0004] To achieve the above object, the present invention provides the following technical solution: A reverse osmosis membrane sewage treatment device includes a tower body, a purified liquid discharge pipe installed at the bottom of the tower body, and a lower rotating cylinder rotatably communicated with the purified liquid discharge pipe. An upper rotating cylinder that can rotate periodically by 90° is installed in the tower body, and the upper rotating cylinder is linked with the lower rotating cylinder; A transmission system is provided on the upper rotating cylinder, and two symmetrically arranged treatment systems are installed on the upper rotating cylinder; The processing system includes a diversion pipe fixedly connected to the lower rotating cylinder and a bidirectional motion system driven by a transmission system. A bidirectional motion frame capable of reciprocating bidirectionally and a torsion shaft capable of alternating forward and reverse rotation are installed on the bidirectional motion system through transmission. The reciprocating frequency and reciprocating stroke of the bidirectional motion frame change cyclically. The torsion shaft is rotatably installed on the bidirectional motion frame, and a torsion cylinder is installed at the bottom end of the torsion shaft. A filter element, a main torsion spring, and an expansion bladder cylinder are respectively installed between the torsion cylinder and the diversion pipe. The main torsion spring is arranged outside the filter element, and the expansion bladder cylinder is arranged inside the filter element and is provided with a group of liquid-permeable strip holes. During the rotation of the upper rotating cylinder, the expansion bladder cylinder is alternately inflated and deflated; The filter element includes an elastic corrugated core body. A spiral support skeleton is arranged inside the elastic corrugated core body, and both ends of the spiral support skeleton are respectively fixed to the torsion cylinder and the diversion pipe. A magnetic functional layer is arranged outside the elastic corrugated core body. Two symmetrically arranged magnetic field generators are installed on the tower body, and the magnetic functional layer responds to the alternating magnetic field generated by the magnetic field generators and generates mechanical vibration.

[0005] As a preferred technical solution of the present invention, the transmission system includes a motor installed on the tower body, an intermittent shaft rotatably connected to the top of the tower body, and a indexing gear installed on the upper rotating cylinder. An indexing gear in transmission connection with the indexing gear is installed on the intermittent shaft. A partial tooth surface meshing with the indexing gear is provided on the indexing gear. A toothed cylinder is rotatably sleeved on the upper rotating cylinder. A sector large gear and a sector small gear are respectively installed on the toothed cylinder. Two symmetrically arranged non-engagement areas are arranged at positions corresponding to the sector large gear and the sector small gear on the toothed cylinder. The output shaft end of the motor is in transmission connection with a first synchronous toothed belt, and both the intermittent shaft and the toothed cylinder are in transmission connection with the first synchronous toothed belt.

[0006] As a preferred technical solution of the present invention, the indexing gear and the indexing gear have the same radius. The central angle corresponding to the partial tooth surface is 90°. The central angle corresponding to the sector large gear is 180°. The central angle corresponding to the sector small gear is 120°. The central angles corresponding to the two non-engagement sections are both 30°.

[0007] As a preferred technical solution of the present invention, the bidirectional motion system includes a positioning frame installed on the upper rotating drum, a unidirectional motion frame is slidably installed on the positioning frame, a left gear shaft, a right gear shaft, an upper shaft and two translation screws are rotatably installed on the positioning frame, two follower gears are installed on the left gear shaft, and the two follower gears are respectively meshed with the fan-shaped large gear and the fan-shaped small gear, the left gear shaft is transmission-connected with the right gear shaft through a second synchronous toothed belt, the right gear shaft and the upper shaft are both installed with a first bevel gear, the two first bevel gears are meshed with each other, a third synchronous toothed belt is transmission-installed on the upper shaft, the two translation screws are both transmission-connected with the third synchronous toothed belt, the two translation screws are both transmission-connected with the unidirectional motion frame, a linkage component is installed between the unidirectional motion frame and the torsion shaft and the bidirectional motion frame, the radius of the fan-shaped large gear is 13 times to 15 times the radius of the corresponding follower gear, and the radius of the fan-shaped small gear is 9 times to 11 times the radius of the other corresponding follower gear.

[0008] As a preferred technical solution of the present invention, a sewage valve communicating with the inner cavity of the tower body is provided at the bottom of the tower body, a sewage inlet pipe communicating with the inner cavity of the tower body is installed at the upper part of the tower body, and a coupling is installed between the upper and lower rotating drums.

[0009] As a preferred technical solution of the present invention, the linkage component includes a hollow rotary sleeve, a vertical moving screw rod and a lower shaft rotatably connected to the unidirectional motion frame, the hollow rotary sleeve is fixedly provided with a first square groove with openings at both ends and slidably connected to the upper shaft, the hollow rotary sleeve and the lower shaft are both installed with a second bevel gear, the two second bevel gears are orthogonally meshed, and a fourth synchronous toothed belt is transmission-connected between the lower shaft and the hollow rotary sleeve, the two-way motion frame is slidably connected to the unidirectional motion frame, the vertical moving screw rod is transmission-connected to the two-way motion frame, the rotation connection between the vertical moving screw rod and the unidirectional motion frame and the rotation connection between the two translation screw rods and the positioning frame are all provided with a secondary torsion spring, the torsion shaft is fixedly provided with a second square groove with a top end opening and slidably connected to the lower shaft, and the cross-sections of the first square groove, the second square groove, the upper shaft and the lower shaft are all regular polygons.

[0010] As a preferred technical solution of the present invention, it further includes a pressurizing pump installed on the tower body and a pressure control cylinder arranged inside the upper rotating cylinder. The pressure control cylinder is rotatably connected to the upper rotating cylinder through a bearing. An isolated pressurizing chamber and a pressure relief chamber are provided inside the pressure control cylinder. The top of the pressure relief chamber is open. Two symmetrically arranged pressurizing holes communicating with the pressurizing chamber and two symmetrically arranged pressure relief holes communicating with the pressure relief chamber are provided on the pressure control cylinder. The pressure relief holes and the pressurizing holes are arranged at a 90° dislocation. Two corrugated pipes are fixedly connected to the upper rotating cylinder. The other ends of the two corrugated pipes are respectively communicated with the inner cavities of the expansion bladder cylinders in the two treatment systems. The pressurizing port of the pressurizing pump is communicated with the pressurizing chamber. A pressure probe is fixedly arranged at the connection between the pressurizing pump and the pressurizing chamber. A microcontroller is installed on the tower body. The data end of the pressure probe is connected to the microcontroller for data connection.

[0011] As a preferred technical solution of the present invention, the elastic corrugated core is made of an elastic composite reverse osmosis membrane material. The elastic composite reverse osmosis membrane material is a laminated structure of a polyamide reverse osmosis membrane layer and polyurethane or silica gel. A multi-layer micro-slit structure is formed on the surface of the elastic corrugated core. When the elastic corrugated core is stretched or expands internally, the micro-slit structure opens to discharge the adhered impurities. When the elastic corrugated core is in a non-stretched state, the micro-slit structure closes for normal filtration. The spiral support skeleton is a stainless steel mesh or a nylon mesh.

[0012] As a preferred technical solution of the present invention, both the main torsion spring and the auxiliary torsion spring are made of nickel-based corrosion-resistant alloy materials, and a polytetrafluoroethylene coating is provided on both the main torsion spring and the auxiliary torsion spring.

[0013] As a preferred technical solution of the present invention, a sewage treatment method for a reverse osmosis membrane sewage treatment device includes the following steps: SS01. Sewage input and system initialization: Sewage is input into the tower body through the sewage inlet pipe. The motor, magnetic field generator, and pressurizing pump are started. The upper rotating cylinder rotates periodically by 90°. The intermittent shaft drives the indexing gear through the indexing gear, so that the upper rotating cylinder completes a 90° step per cycle. SS02. The treatment system alternately performs filtration and cleaning: In the filtration mode, the expansion bladder cylinder exhausts and contracts, the micro-slit structure closes, and the sewage is filtered by the filter element and discharged through the purified liquid discharge pipe. In the cleaning mode, the expansion bladder cylinder is inflated and expanded, the bidirectional moving frame reciprocates, the torsion shaft rotates forward and backward, the micro-slit structure opens, the magnetic functional layer vibrates to peel off impurities, and the impurities are discharged through the sewage discharge valve. The two systems cooperate to continuously process: The upper rotating cylinder rotates to switch positions, and the two treatment systems alternately filter and clean. SS03. Sewage discharge and reset: The sewage discharge valve is opened regularly, and the microcontroller adjusts the pressurizing pump, and the system enters the next cycle.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention innovatively constructs a three-dimensional self-cleaning mechanism of "mechanical stretching, air pressure pulse, and magnetic field vibration" for the reverse osmosis membrane, which is specifically manifested as follows: the bidirectional motion frame reciprocates with a cyclically changing frequency and stroke, driving the torsion shaft to alternately rotate forward and reverse, applying periodic stretching and torsion forces to the filter element through the torsion cylinder, and cooperating with the compression and reset of the outer main torsion spring to deform the elastic corrugated core, and the expansion bladder rotates with the upper rotating cylinder to alternately inflate and exhaust and contract, the inner side expands to open the core, and the outer main torsion spring resets and contracts, forming a dynamic deformation of "inner expansion and outer pulling", which prompts the micro-slit structure on the surface of the core to open and close periodically, opening to remove impurities when stretching and expanding, and closing to filter when contracting, and the magnetic functional layer vibrates at a high frequency in the alternating magnetic field of the magnetic field generator to generate ultrasonic-level disturbances, effectively breaking the van der Waals force adsorption of pollutants and the membrane surface. The three work synergistically, without the need for chemical agents or shutdown and disassembly, to efficiently strip stubborn pollutants such as colloids, microorganisms, and organic macromolecules on the membrane surface, solving the technical bottleneck that traditional single axial cleaning cannot remove complex pollutants.

[0015] 2. In the prior art, the fluid easily forms laminar flow on the membrane surface, resulting in concentration polarization and accumulation of filter cake layers, which is the main reason for reducing filtration efficiency. The present invention achieves a breakthrough through the following design: the reciprocating frequency and stroke cycle of the bidirectional motion frame change, driving the filter element to produce irregular swings in the sewage, destroying the stable laminar boundary layer on the membrane surface, forming a turbulent effect, promoting the dispersion of pollutants with the water flow, and reducing the local enrichment of solutes on the membrane surface. The micro-slits of the elastic corrugated core are closed during filtration and opened during cleaning to avoid continuous accumulation of filter cake layers. Combined with the radial support of the spiral support skeleton, the effective filtration area of the membrane surface is maintained.

[0016] 3. The prior art requires that the non-working reverse osmosis membrane components be removed for cleaning, resulting in interruption of the treatment process. The present invention uses the design of a "periodic 90° rotating upper drum" to allow the two treatment systems to alternate between the "filtration station" and the "cleaning station". When one treatment system filters sewage through the filter element, the other treatment system simultaneously completes the self-cleaning process of "inflation of the expansion bladder, core stretching, micro-slit impurity removal, and magnetic vibration peeling". The upper drum switches the station every 90° to ensure that at least one treatment system is always in a filtering state, thereby achieving 24-hour continuous sewage treatment. Compared with the "filtration, shutdown cleaning, and restart" mode of traditional devices, the continuous treatment capacity of the present invention increases the sewage throughput per unit time, and is particularly suitable for large-scale treatment scenarios such as industrial wastewater and municipal sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a reverse osmosis membrane sewage treatment device of the present invention; Figure 2 It is a schematic diagram of the structure of the sewage inlet pipe and the diversion pipe of the present invention; Figure 3 For the present inventionFigure 2 Schematic diagram of the partial enlarged structure at A in the [device / component name]; Figure 4 This invention Figure 2 Schematic diagram of the partial enlarged structure at B in the [device / component name]; Figure 5 Schematic diagram of the structure of the diversion pipe and the follower gear of this invention; Figure 6 Schematic diagram of the structure of the indexing gear and the upper rotating cylinder of this invention; Figure 7 Schematic diagram of the structure of the hollow rotating sleeve and the bidirectional moving frame of this invention; Figure 8 Schematic diagram of the cross-sectional structure of the filter element of this invention; Figure 9 Schematic diagram of the structure of the expansion bladder cylinder of this invention.

[0018] In the figure: 1. Tower body; 2. Clean liquid discharge pipe; 3. Lower rotating cylinder; 4. Upper rotating cylinder; 5. Diversion pipe; 6. Torsion shaft; 7. Bidirectional moving frame; 8. Torsion cylinder; 9. Filter element; 10. Main torsion spring; 11. Expansion bladder cylinder; 12. Liquid permeable strip hole; 13. Elastic corrugated core; 14. Spiral support skeleton; 15. Magnetic functional layer; 16. Magnetic field generator; 17. Motor; 18. Intermittent shaft; 19. Indexing gear; 20. Indexing gear; 21. Tooth cylinder; 22. Sector large gear; 23. Sector small gear; 24. Positioning frame; 25. Unidirectional moving frame; 26. Left tooth shaft; 27. Right tooth shaft; 28. Upper shaft; 29. Translation lead screw; 30. Follower gear; 31. Drain valve; 32. Sewage inlet pipe; 33. Microcontroller; 34. Coupling; 35. Hollow rotating sleeve; 36. Vertical movement lead screw; 37. Lower shaft; 38. Sub-torsion spring; 39. Pressurizing pump; 40. Pressure control cylinder; 41. Pressurizing chamber; 42. Pressure relief chamber; 43. Pressurizing hole; 44. Pressure relief hole. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of this invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this invention. Obviously, the described embodiments are only a part of the embodiments of this invention, rather than all of the embodiments. Based on the embodiments of this invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this invention.

[0020] As Figures 1 to 9As shown in the figure, the present invention provides a reverse osmosis membrane sewage treatment device, which includes a tower body 1, a purified liquid discharge pipe 2 installed at the bottom of the tower body 1, and a lower rotating cylinder 3 rotatably communicated with the purified liquid discharge pipe 2. A sewage discharge valve 31 communicating with the inner cavity of the tower body 1 is provided at the bottom of the tower body 1. A sewage inlet pipe 32 communicating with the inner cavity of the tower body 1 is installed at the upper part of the tower body 1. An upper rotating cylinder 4 that can rotate periodically by 90° is installed in the tower body 1. The upper rotating cylinder 4 is linked with the lower rotating cylinder 3, and a coupling shaft 34 is installed between the upper rotating cylinder 4 and the lower rotating cylinder 3; A transmission system is provided on the upper rotating cylinder 4, and two symmetrically arranged treatment systems are installed on the upper rotating cylinder 4; The treatment system includes a diversion pipe 5 fixedly communicated with the lower rotating cylinder 3 and a bidirectional motion system driven by the transmission system. A bidirectional motion frame 7 that can move reciprocally in both directions and a torsion shaft 6 that can rotate forward and reverse alternately are installed on the bidirectional motion system. The reciprocating frequency and reciprocating stroke of the bidirectional motion frame 7 change cyclically. The torsion shaft 6 is rotatably installed on the bidirectional motion frame 7. A torsion cylinder 8 is installed at the bottom end of the torsion shaft 6. A filter element 9, a main torsion spring 10, and an expansion bladder cylinder 11 are respectively installed between the torsion cylinder 8 and the diversion pipe 5. The main torsion spring 10 is arranged outside the filter element 9. The expansion bladder cylinder 11 is arranged inside the filter element 9 and a group of liquid permeable strip holes 12 are provided on the expansion bladder cylinder 11. The expansion bladder cylinder 11 is alternately inflated and deflated during the rotation of the upper rotating cylinder 4; After the motor 17 is started, the first synchronous toothed belt synchronously drives the intermittent shaft 18 and the toothed cylinder 21 to rotate. When the indexing gear 20 on the intermittent shaft 18 meshes with the indexing gear 19 of the upper rotating cylinder 4, it drives the upper rotating cylinder 4 to rotate 90°, and then enters a non-meshing state to make the upper rotating cylinder 4 pause, realizing periodic intermittent rotation, pausing once every 90° rotation; After the sewage enters the tower body 1 through the sewage inlet pipe 32, the upper rotating cylinder 4 rotates periodically by 90° through the transmission system, driving the two treatment systems to alternately be in the filtering station; During filtration, the sewage passes through the filter element 9 and enters the inside of the filter element 9 through the liquid permeable strip holes 12 of the expansion bladder cylinder 11. After being filtered by the elastic corrugated core body 13, the purified liquid flows into the lower rotating cylinder 3 through the diversion pipe 5 and is discharged through the purified liquid discharge pipe 2. During this process, the bidirectional motion system drives the bidirectional motion frame 7 to reciprocate with a cyclically changing frequency and stroke. At the same time, the torsion shaft 6 drives the torsion cylinder 8 to rotate forward and reverse, causing the main torsion spring 10 outside the filter element 9 to be periodically compressed and reset. Cooperating with the alternate inflation and deflation of the expansion bladder cylinder 11 when the upper rotating cylinder 4 rotates to the pressure control cylinder 40, the pressure charging hole 43, and the pressure relief hole 44, the elastic corrugated core body 13 generates a stretching and shrinking cycle. At the same time, the magnetic field generator 16 on the tower body 1 generates an alternating magnetic field, driving the magnetic functional layer 15 outside the filter element 9 to vibrate, forming a three-dimensional self-cleaning mechanism of "mechanical stretching, air pressure pulse, and magnetic field vibration"; This solution solves the problems of traditional reverse osmosis membranes being easily blocked by impurities and having a high cleaning frequency. Through periodic compound motion, the micro-slit structure on the surface of the filter element 9 is closed for filtration in a non-stretched state, and opens to discharge impurities when stretched and expanded, automatically discharging the adhered pollutants without stopping for chemical cleaning, significantly improving the sewage treatment efficiency and the service life of the membrane module. Moreover, the alternating operation of the dual treatment systems realizes continuous treatment.

[0021] The transmission system includes a motor 17 installed on the tower body 1, an intermittent shaft 18 rotatably connected to the top of the tower body 1, and a indexing gear 19 installed on the upper rotating cylinder 4. An indexing gear 20 drivingly connected to the indexing gear 19 is installed on the intermittent shaft 18. A partial tooth surface meshing with the indexing gear 19 is provided on the indexing gear 20. A toothed cylinder 21 is rotatably sleeved on the upper rotating cylinder 4. A sector large gear 22 and a sector small gear 23 are respectively installed on the toothed cylinder 21. Two symmetrically arranged non-meshing areas are provided on the toothed cylinder 21 at positions corresponding to between the sector large gear 22 and the sector small gear 23. The output shaft end of the motor 17 is drivingly connected with a first synchronous toothed belt, and both the intermittent shaft 18 and the toothed cylinder 21 are drivingly connected with the first synchronous toothed belt.

[0022] The indexing gear 19 and the indexing gear 20 have the same radius. The central angle corresponding to the partial tooth surface is 90°. The central angle corresponding to the sector large gear 22 is 180°. The central angle corresponding to the sector small gear 23 is 120°. The central angles corresponding to the two non-meshing sections are both 30°. When the driven gear on the left tooth shaft 26 meshes with the sector gear of the toothed cylinder 21, a speed amplification effect is generated due to the radius difference, which is transmitted to the right tooth shaft 27 through the second synchronous toothed belt, and then drives the upper shaft 28 to rotate after the direction is changed by the bevel gear. The upper shaft 28 drives two translation lead screws 29 to rotate synchronously through the third synchronous toothed belt, so that the one-way movement frame 25 linearly reciprocates along the positioning frame 24. At the same time, the upper shaft 28 drives the lower shaft 37 to rotate through the first square groove of the hollow rotating sleeve 35, and is transmitted to the torsion shaft 6 through the bevel gear and the fourth synchronous toothed belt, so that the torsion shaft 6 alternates between forward and reverse rotations with the upper shaft 28. The vertical movement lead screw 36 is matched with the screw nut pair of the two-way movement frame 7 to convert the translation of the one-way movement frame 25 into the vertical reciprocating movement of the two-way movement frame 7, and the auxiliary torsion spring 38 provides a reset elastic force. This linkage design enables the torsion shaft 6 to rotate synchronously in forward and reverse directions during the reciprocation of the two-way movement frame 7, driving the torsion cylinder 8 to apply a torsional force to the filter element 9, forming a compound mechanical action with the stretching and expansion force, effectively peeling off the stubborn pollutants on the membrane surface, solving the limitations of traditional single-axial cleaning, and the variable-parameter movement can adapt to the pollution characteristics of different water qualities, improving the universality of self-cleaning. The bidirectional motion system includes a positioning frame 24 mounted on the upper drum 4, a unidirectional motion frame 25 is slidably mounted on the positioning frame 24, a left gear shaft 26, a right gear shaft 27, an upper shaft 28 and two translation screws 29 are rotatably mounted on the positioning frame 24, two follower gears 30 are mounted on the left gear shaft 26, and the two follower gears 30 are respectively meshed and connected with the sector gear 22 and the sector gear 23, the left gear shaft 26 is connected to the right gear shaft 27 through a second synchronous toothed belt, and the right gear shaft 27 and the upper shaft 28 are connected to each other. A first bevel gear is installed on each of the two first bevel gears, which mesh with each other. A third synchronous toothed belt is installed on the upper shaft 28 for transmission. Two translation screws 29 are both connected to the third synchronous toothed belt for transmission. The two translation screws 29 are both connected to the unidirectional motion frame 25 for transmission. A linkage component is installed between the unidirectional motion frame 25 and the torsion shaft 6 and the bidirectional motion frame 7. The radius of the sector gear 22 is 13 times the radius of the corresponding follower gear 30, and the radius of the sector gear 23 is 10 times the radius of the other corresponding follower gear 30. The linkage components include a hollow rotary sleeve 35, a vertical screw rod 36 and a lower shaft 37 which are rotatably connected to the unidirectional motion frame 25. The hollow rotary sleeve 35 is fixedly provided with a first square groove with openings at both ends and slidably connected to the upper shaft 28. The hollow rotary sleeve 35 and the lower shaft 37 are both provided with a second bevel gear, and the two second bevel gears are orthogonally meshed. A fourth synchronous toothed belt is transmission-connected between the lower shaft 37 and the hollow rotary sleeve 35. The bidirectional motion frame 7 is slidably connected to the unidirectional motion frame 25. The vertical screw rod 36 is transmission-connected to the bidirectional motion frame 7. A secondary torsion spring 38 is provided at the rotation connection between the vertical screw rod 36 and the unidirectional motion frame 25 and at the rotation connection between the two translation screw rods 29 and the positioning frame 24. The torsion shaft 6 is fixedly provided with a second square groove with an opening at the top end and slidably connected to the lower shaft 37. The cross sections of the first square groove, the second square groove, the upper shaft 28 and the lower shaft 37 are all regular polygons. The main torsion spring 10 and the auxiliary torsion spring 38 are both made of nickel-based corrosion-resistant alloy, and are both provided with polytetrafluoroethylene coatings; The beneficial effect of adopting the above scheme is that, through the above material and coating structure setting of the main torsion spring 10 and the auxiliary torsion spring 38, the corrosion resistance of the main torsion spring 10 and the auxiliary torsion spring 38 can be effectively improved and their service life and anti-deformation effect in the water body can be improved; The filter element 9 includes an elastic corrugated core 13, which has a spiral support skeleton 14 built in it. The two ends of the spiral support skeleton 14 are respectively fixed to the torsion cylinder 8 and the guide tube 5. A magnetic functional layer 15 is provided on the outer side of the elastic corrugated core 13. Two symmetrically arranged magnetic field generators 16 are installed on the tower body 1. The magnetic functional layer 15 responds to the alternating magnetic field generated by the magnetic field generator 16 and generates mechanical vibration.

[0023] The elastic corrugated core 13 is made of an elastic composite reverse osmosis membrane material, which is a laminated structure of a polyamide reverse osmosis membrane layer and polyurethane or silica gel. A multi-layer micro-slit structure is formed on the surface of the elastic corrugated core 13. When the elastic corrugated core 13 is stretched or expands internally, the micro-slit structure opens to discharge the adhered impurities. When the elastic corrugated core 13 is in a non-stretched state, the micro-slit structure closes for normal filtration. The spiral support framework 14 is made of stainless steel mesh or nylon mesh; The elastic corrugated core 13 is laminated by a polyamide reverse osmosis membrane layer and a polyurethane elastic layer. The spiral support framework 14 provides a radial support force to prevent the membrane body from being overstretched and damaged; During filtration, the multi-layer micro-slit structure intercepts ions, organic substances, and microorganisms in the sewage to achieve high-precision purification; During self-cleaning, the expansion bladder 11 is pressurized or the torsion cylinder 8 rotates to stretch / twist the core. The micro-slits open to the micron level. Combining with the alternating magnetic field generated by the magnetic field generator 16, the magnetic functional layer 15 is driven to vibrate at a high frequency, forming a synergistic effect of "micro-slit expansion plus ultrasonic-level vibration" to effectively break the van der Waals force adsorption between the pollutants and the membrane surface; Compared with traditional flat membranes, the corrugated structure increases the membrane area and significantly improves the treatment efficiency per unit volume. Moreover, the magnetic vibration does not require contact cleaning components, avoiding mechanical wear and being suitable for long-term stable operation of high-turbidity and high-viscosity sewage; It also includes a pressure pump 39 installed on the tower body 1 and a pressure control cylinder 40 arranged inside the upper rotating cylinder 4. The pressure control cylinder 40 is rotatably connected to the upper rotating cylinder 4 through a bearing. The interior of the pressure control cylinder 40 is provided with a pressure charging chamber 41 and a pressure relief chamber 42 that are isolated from each other. The top of the pressure relief chamber 42 is open. The pressure control cylinder 40 is provided with two symmetrically arranged pressure charging holes 43 communicating with the pressure charging chamber 41 and two symmetrically arranged pressure relief holes 44 communicating with the pressure relief chamber 42. The pressure relief holes 44 are offset by 90° from the pressure charging holes 43. Two corrugated connecting pipes are fixedly connected to the upper rotating cylinder 4, and the other ends of the two corrugated connecting pipes are respectively communicated with the inner cavities of the expansion bladders 11 in the two treatment systems. The pressure charging port of the pressure pump 39 is communicated with the pressure charging chamber 41. A pressure probe is fixedly arranged at the connection between the pressure pump 39 and the pressure charging chamber 41. A microcontroller 33 is installed on the tower body 1. The data end of the pressure probe is data-connected to the microcontroller 33.

[0024] When the upper drum 4 rotates, the corrugated joint pipe rotates synchronously with the processing system. When the expansion capsule 11 is aligned with the pressure-charging hole 43 of the pressure-controlling cylinder 40, the pressure-charging pump 39 starts to fill the capsule with compressed air. The capsule expands and stretches the inner side of the filter element 9, so that the elastic corrugated core 13 stretches, the surface micro-slit structure opens, and the adhered impurities are discharged with the backwash water flow. When the expansion capsule 11 rotates to the pressure relief hole 44, the air pressure drops suddenly, the main torsion spring 10 resets to drive the filter element 9 to contract, the micro-slit closes and resumes filtration, the air pressure probe monitors the pressure of the pressure-charging chamber 41 in real time, and the microcontroller 33 automatically adjusts the start and stop of the pressure-charging pump 39 according to the preset threshold value to avoid overpressure damaging the membrane assembly; The pneumatically driven self-cleaning mechanism does not require an additional mechanical power source. It realizes the automatic cycle of "filtration and recoil" through the switching of rotary workstations and pressure pulses. Compared with traditional chemical cleaning, it is more energy-saving and environmentally friendly, and has high pressure control accuracy. It can adapt to the pressure tolerance characteristics of different membrane materials and extend the service life of the device. The bidirectional motion system can achieve multiple technical effects through the transmission installation of a bidirectional motion frame 7 that can reciprocate in both directions with a cyclic change in reciprocating frequency and stroke, and a torsion shaft 6 that can alternately rotate forward and reverse. The two-way motion system can bring about multiple technical effects: First, it can improve the filtration efficiency and effect. The reciprocating motion of the bidirectional motion frame 7 drives the torsion shaft 6 and the torsion cylinder 8 to swing, so that the fluid generates turbulence, reduces concentration polarization and improves the filtration efficiency. The forward and reverse rotation of the torsion shaft 6 drives the filter element 9 to twist and deform, and the elastic corrugated core 13 is stretched and contracted to allow the micro-slit structure to open and close periodically, so as to achieve fine filtration and impurity discharge and avoid the accumulation of filter cake layers. Second, the self-cleaning function is realized and the service life of the filter element 9 is extended. The movement of the bidirectional motion frame 7 causes the filter element 9 to bear a composite mechanical force through the linkage components, and the vibration of the magnetic functional layer 15 forms a multi-dimensional disturbance to remove pollutants, thereby reducing chemical cleaning and membrane damage. The frequency and stroke cycle changes avoid fatigue damage caused by a single load on the filter element 9. The third is to strengthen the system's ability to operate in coordination. The movement cycle of the bidirectional motion frame 7 is synchronized with the inflation and exhaust of the expansion bladder 11 to assist in adjusting the filtration pressure. The gear ratio design of the transmission system enables the movement to change regularly to meet different water quality treatment requirements. Fourth, energy consumption and maintenance costs are reduced. The auxiliary torsion spring 38 stores and releases elastic potential energy during switching to reduce energy loss, and the mechanical autonomous cleaning mechanism reduces the frequency of manual intervention.

[0025] The principle that the magnetic functional layer 15 responds to the alternating magnetic field generated by the magnetic field generator 16 and generates mechanical vibrations is based on the synergistic effect of the magnetostrictive effect and the electromagnetically induced eddy current effect; The magnetic functional layer 15 is made of a soft magnetic composite material, with micron-sized magnetic particles and conductive particles evenly distributed inside, and has both magnetic response and elastic deformation characteristics; The magnetic field generator 16 symmetrically arranged on the tower body 1 outputs a high-frequency alternating magnetic field. In the alternating magnetic field, the magnetic particles of the magnetic functional layer 15 produce periodic size expansion and contraction due to the magnetostrictive effect, driving the functional layer to vibrate at a high frequency. The alternating magnetic field will also generate induced eddy currents in the magnetic functional layer 15 due to the conductive particles. The eddy currents interact with the magnetic field to generate Lorentz forces to drive vibrations. The high-frequency vibrations trigger cavitation effects in the liquid on the membrane surface, and at the same time generate high-frequency shear stresses to peel off the viscous pollutant adsorption layer; Combined with the micro-slits opening when the elastic corrugated core 13 stretches and expands, the vibration promotes the impurities in the micro-slits to be discharged with the water flow; In addition, the frequency of the magnetic field generator 16 and the natural frequency of the magnetic functional layer 15 are optimized and matched through simulation. The resonance effect is used to maximize the vibration amplitude and improve the peeling efficiency; The symmetric arrangement of the dual magnetic field generators 16 ensures the vibration uniformity and avoids local cleaning blind spots; A sewage treatment method for a reverse osmosis membrane sewage treatment device includes the following steps: SS01. Sewage input and system initialization: Sewage is input into the tower body 1 through the sewage inlet pipe 32. The motor 17, the magnetic field generator 16 and the pressurizing pump 39 are started. The upper rotating cylinder 4 rotates periodically by 90°. The intermittent shaft 18 drives the indexing gear 20 to drive the indexing gear 19, so that the upper rotating cylinder 4 completes a 90° step per cycle; SS02. The treatment system alternately performs filtration and cleaning: In the filtration mode, the expansion bladder 11 exhausts and contracts, and the micro-slit structure closes. The sewage is filtered by the filter element 9 and discharged through the purified liquid discharge pipe 2. In the cleaning mode, the expansion bladder 11 is inflated and expanded, the bidirectional moving frame 7 reciprocates, and the torsion shaft 6 rotates forward and backward. The micro-slit structure opens, and the magnetic functional layer 15 vibrates to peel off impurities. The impurities are discharged through the sewage discharge valve 31. The dual systems cooperate for continuous treatment: The upper rotating cylinder 4 rotates to switch stations, and the two treatment systems alternately filter and clean; SS03. Sewage discharge and reset: The sewage discharge valve 31 is opened regularly, and the microcontroller 33 adjusts the pressurizing pump 39, and the system enters the next cycle.

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti - permeation membrane sewage treatment device, comprising a tower body (1), a purified liquid discharge pipe (2) installed at the bottom of the tower body (1), and a lower rotating cylinder (3) rotatably communicated with the purified liquid discharge pipe (2), characterized in that: An upper rotating drum (4) capable of periodically rotating 90 degrees is installed in the tower body (1); the upper rotating drum (4) is linked with the lower rotating drum (3); a transmission system is provided on the upper rotating drum (4); and two symmetrically arranged processing systems are installed on the upper rotating drum (4); The treatment system comprises a guide tube (5) fixedly connected to the lower drum (3) and a bidirectional motion system driven by a transmission system. The bidirectional motion system is provided with a bidirectional motion frame (7) capable of bidirectional reciprocating motion and a torsion shaft (6) capable of alternately rotating forward and reversely. The reciprocating frequency and reciprocating stroke of the bidirectional motion frame (7) are cyclically changed. The torsion shaft (6) is rotatably mounted on the bidirectional motion frame (7). A torsion cylinder (8) is mounted at the bottom end of the torsion shaft (6). A filter element (9), a main torsion spring (10) and an expansion capsule (11) are respectively mounted between the torsion cylinder (8) and the guide tube (5). The main torsion spring (10) is arranged on the outside of the filter element (9). The expansion capsule (11) is arranged on the inside of the filter element (9) and a group of liquid-permeable strip holes (12) are opened on the expansion capsule (11). The expansion capsule (11) is alternately inflated and exhausted during the rotation of the upper drum (4). The filter element (9) comprises an elastic corrugated core (13), the elastic corrugated core (13) having a spiral support frame (14) built therein, the two ends of the spiral support frame (14) being respectively fixed to the torsion cylinder (8) and the flow guide tube (5), a magnetic functional layer (15) being provided on the outer side of the elastic corrugated core (13), two symmetrically arranged magnetic field generators (16) being mounted on the tower body (1), the magnetic functional layer (15) responding to the alternating magnetic field generated by the magnetic field generator (16) and generating mechanical vibration.

2. The reverse osmosis membrane sewage treatment device according to claim 1, wherein: The transmission system comprises a motor (17) mounted on a tower body (1), an intermittent shaft (18) rotatably connected to the top of the tower body (1), and an indexing gear (19) mounted on an upper rotating drum (4); a dividing gear (20) drivingly connected to the indexing gear (19) is mounted on the intermittent shaft (18); the indexing gear (20) is provided with a partial tooth surface meshing with the indexing gear (19); a gear cylinder (21) is rotatably sleeved on the upper rotating drum (4); a sector gear (22) and a sector pinion (23) are respectively mounted on the gear cylinder (21); two symmetrically arranged non-meshing areas are provided on the gear cylinder (21) at positions corresponding to the sector gear (22) and the sector pinion (23); an output shaft end of the motor (17) is drivingly connected to a first synchronous toothed belt; the intermittent shaft (18) and the gear cylinder (21) are both drivingly connected to the first synchronous toothed belt.

3. An apparatus for treating sewage by a reverse osmosis membrane according to claim 2, characterized in that: The indexing gear (19) and the indexing gear (20) have the same radius, the central angle corresponding to the partial tooth surface is 90°, the central angle corresponding to the sector gear (22) is 180°, the central angle corresponding to the sector gear (23) is 120°, and the central angles corresponding to the two non-meshing sections are both 30°.

4. An apparatus for treating sewage by reverse osmosis membrane according to claim 3, characterized in that: The bidirectional motion system includes a positioning frame (24) installed on the upper rotating cylinder (4). A unidirectional motion frame (25) is slidably installed on the positioning frame (24). A left tooth shaft (26), a right tooth shaft (27), an upper shaft (28) and two translation lead screws (29) are respectively rotatably installed on the positioning frame (24). Two follower gears (30) are installed on the left tooth shaft (26). The two follower gears (30) are respectively meshed and connected with a large sector gear (22) and a small sector gear (23). The left tooth shaft (26) is drivingly connected with the right tooth shaft (27) through a second synchronous toothed belt. First bevel gears are installed on both the right tooth shaft (27) and the upper shaft (28). The two first bevel gears are meshed with each other. A third synchronous toothed belt is drivingly installed on the upper shaft (28). Both of the two translation lead screws (29) are drivingly connected with the third synchronous toothed belt. Both of the two translation lead screws (29) are drivingly connected with the unidirectional motion frame (25). A linkage component is installed between the unidirectional motion frame (25), the torsion shaft (6) and the bidirectional motion frame (7). The radius of the large sector gear (22) is 13 to 15 times the radius of the corresponding follower gear (30). The radius of the small sector gear (23) is 9 to 11 times the radius of the other corresponding follower gear (30).

5. An apparatus for treating sewage with a reverse osmosis membrane according to claim 4, characterized in that: A sewage discharge valve (31) communicating with the inner cavity of the tower body (1) is provided at the bottom of the tower body (1). A sewage inlet pipe (32) communicating with the inner cavity of the tower body (1) is installed on the upper part of the tower body (1). A coupling (34) is installed between the upper rotating cylinder (4) and the lower rotating cylinder (3).

6. The reverse osmosis membrane sewage treatment device according to claim 4, wherein: The linkage component includes a hollow rotating sleeve (35), a vertical translation lead screw (36) and a lower shaft (37) rotatably connected to the unidirectional motion frame (25). A first square groove with both ends open and slidably connected with the upper shaft (28) is fixedly opened inside the hollow rotating sleeve (35). Second bevel gears are installed on both the hollow rotating sleeve (35) and the lower shaft (37). The two second bevel gears are orthogonally meshed. A fourth synchronous toothed belt is drivingly connected between the lower shaft (37) and the hollow rotating sleeve (35). The bidirectional motion frame (7) is slidably connected to the unidirectional motion frame (25). The vertical translation lead screw (36) is drivingly connected with the bidirectional motion frame (7). Auxiliary torsion springs (38) are provided at the rotational connection of the vertical translation lead screw (36) and the unidirectional motion frame (25) and at the rotational connections of the two translation lead screws (29) and the positioning frame (24). A second square groove with the top end open and slidably connected with the lower shaft (37) is fixedly opened inside the torsion shaft (6). The cross-sections of the first square groove, the second square groove, the upper shaft (28) and the lower shaft (37) are all regular polygons.

7. An apparatus for treating sewage by reverse osmosis membrane according to claim 1, characterized in that: It further includes a pressurizing pump (39) installed on the tower body (1) and a pressure control cylinder (40) arranged inside the upper rotating cylinder (4). The pressure control cylinder (40) is rotationally connected to the upper rotating cylinder (4) through a bearing. An isolated pressurizing chamber (41) and a pressure relief chamber (42) are formed inside the pressure control cylinder (40). The top of the pressure relief chamber (42) is open. Two symmetrically arranged pressurizing holes (43) communicating with the pressurizing chamber (41) and two symmetrically arranged pressure relief holes (44) communicating with the pressure relief chamber (42) are formed on the pressure control cylinder (40). The pressure relief holes (44) are arranged at a 90° offset from the pressurizing holes (43). Two corrugated pipes are fixedly communicated with the upper rotating cylinder (4), and the other ends of the two corrugated pipes are respectively communicated with the inner cavities of the expansion bladder cylinders (11) in the two treatment systems. The pressurizing port of the pressurizing pump (39) is communicated with the pressurizing chamber (41). A pressure probe is fixedly arranged at the connection between the pressurizing pump (39) and the pressurizing chamber (41). A microcontroller (33) is installed on the tower body (1). The data end of the pressure probe is data-connected to the microcontroller (33).

8. An apparatus for treating sewage with a reverse osmosis membrane according to claim 1, wherein: The elastic corrugated core (13) is made of an elastic composite reverse osmosis membrane material. The elastic composite reverse osmosis membrane material is a laminated structure of a polyamide reverse osmosis membrane layer and polyurethane or silica gel. A multi-layer micro-slit structure is formed on the surface of the elastic corrugated core (13). When the elastic corrugated core (13) is stretched or expands internally, the micro-slit structure opens to discharge the adhered impurities. When the elastic corrugated core (13) is in a non-stretched state, the micro-slit structure closes for normal filtration. The spiral support skeleton (14) is a stainless steel mesh or a nylon mesh.

9. An apparatus for treating sewage with a reverse osmosis membrane according to claim 1, characterized in that: Both the main torsion spring (10) and the auxiliary torsion spring (38) are made of a nickel-based corrosion-resistant alloy material, and a polytetrafluoroethylene coating is provided on both the main torsion spring (10) and the auxiliary torsion spring (38).

10. A sewage treatment method for a reverse osmosis membrane sewage treatment device according to any one of claims 1-9, characterized in that, It includes the following steps: SS01. Sewage input and system initialization: Sewage is input into the tower body (1) through the sewage inlet pipe (32). The motor (17), the magnetic field generator (16) and the pressurizing pump (39) are started. The upper rotating cylinder (4) rotates periodically by 90°. The intermittent shaft (18) drives the indexing gear (20) through the indexing gear (20), so that the upper rotating cylinder (4) completes a 90° step per cycle. SS02. The treatment system alternately performs filtration and cleaning: In the filtration mode, the expansion bladder cylinder (11) exhausts and contracts, the micro-slit structure closes, and the sewage is filtered by the filter element (9) and discharged through the purified liquid discharge pipe (2). In the cleaning mode, the expansion bladder cylinder (11) is inflated and expanded, the bidirectional moving frame (7) reciprocates, the torsion shaft (6) rotates forward and backward, the micro-slit structure opens, the magnetic functional layer (15) vibrates to peel off impurities, and the impurities are discharged through the sewage discharge valve (31). The two systems cooperate for continuous treatment: The upper rotating cylinder (4) rotates to switch positions, and the two treatment systems alternately filter and clean. SS03. Sewage discharge and reset: The sewage discharge valve (31) is opened regularly, and the microcontroller (33) adjusts the pressurizing pump (39), and the system enters the next cycle.

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