Ultrafiltration device for water purification treatment

Abstract

The utility model discloses an ultrafiltration device for water purification treatment, which relates to the technical field of water treatment equipment and comprises a first box body and a second box body fixedly connected to the top of the first box body, the first box body and the second box body are both of hollow structures, and the centers of the side walls, close to each other, of the first box body and the second box body are both provided with first channels penetrating in the axial direction of the first box body. A filtering mechanism is arranged in the box body I and comprises a filter cartridge I and a filter cartridge II which are coaxially arranged in the box body I; according to the utility model, through the combination of the ejector pin, the pressure spring and the cover body, when the scraping plate is driven by the driving mechanism to rotate, the scraping plate can be continuously propped against the ejector pin on the outer arc wall of the filter cartridge so as to enable the ejector pin to carry out tamping operation on the filter holes, so that not only is the blockage of the filter holes avoided, but also automatic cleaning can be realized under the condition of no shutdown; the filtering efficiency is improved, and meanwhile, the frequency of cleaning and replacing the filter element is reduced, so that the maintenance cost is reduced, and the production loss caused by shutdown for cleaning or replacing the filter element is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment equipment technical field, concretely is a kind of ultrafiltration device for water purification treatment. BACKGROUND

[0002] Ultrafiltration equipment is a kind of membrane separation technology based on pressure driving, its core lies in using ultrafiltration membrane as filter medium, ultrafiltration membrane can effectively intercept the macromolecular substances such as suspended solids, colloid, bacteria, virus in water, while allowing water molecules, small molecule solute and dissoluble salt to pass through, therefore, ultrafiltration equipment is widely used in water treatment field, in textile printing and dyeing factory, ultrafiltration equipment is often used in wastewater treatment link, printing and dyeing wastewater contains a large amount of dye, additive, suspended solids and other pollutants, by the treatment of ultrafiltration equipment, these pollutants can be effectively removed, realize the purification and reuse of wastewater, reduce production cost, reduce environmental pollution.

[0003] In the existing wastewater ultrafiltration device applied in textile printing and dyeing factory, pre-filtering equipment plays a vital role, it can remove large particle impurities in wastewater, protect subsequent ultrafiltration membrane from damage, however, after long time use, the filter core of pre-filtering equipment is prone to be blocked due to filter hole, and affect the filtering effect, and the traditional pre-filtering device does not have self-cleaning ability, in most cases, the filtered impurities in filter core have not reached the limit amount, so that the filter core is blocked, resulting in that the filter core cannot fully play the effect, so that workers need to frequently replace filter core, which increases maintenance workload.

[0004] Therefore, the present application is provided. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of ultrafiltration device for water purification treatment to solve the problems raised in the above background.

[0006] To solve the above technical problems, the utility model provides a kind of ultrafiltration device for water purification treatment, including box one and the box two of fixed connection in the top of box one, box one and box two are all hollow structure, the center of the side wall of box one and box two mutually close is equipped with the channel one along the axial penetration of box one, the filter mechanism is equipped in box one, filter mechanism includes filter cartridge one and filter cartridge two of coaxial setting in the inside of box one, wherein the cross section radius of filter cartridge one is less than the cross section radius of filter cartridge two and filter cartridge one is located inside filter cartridge two, there is gap between filter cartridge one outer arc wall and filter cartridge two inner arc wall, the filter hole opening of filter cartridge one outer arc wall is fixedly connected with cover body, the inner arc wall of cover body is fixedly connected with compression spring, the end of compression spring inner side away from filter cartridge one outer arc wall is fixedly connected with thimble, thimble is coaxially arranged with filter hole in the corresponding position of filter cartridge one side wall and the length direction of thimble is set towards the axis of filter cartridge one.

[0007] Further, the filter cartridge one and the filter cartridge two are respectively closed at one end away from the box two, the filter holes are uniformly distributed on the outer arc walls of the filter cartridge one and the filter cartridge two, and the filter holes are arranged along the radial direction of the box one and penetrate the filter cartridge one and the filter cartridge two, the axial height of the filter cartridge one is less than the axial height of the filter cartridge two, the length direction of the cover body is arranged along the radial direction of the filter cartridge one, the cover body is coaxially arranged with the ejector pin, the axial length of the cover body is much less than the axial length of the ejector pin, and one end of the ejector pin away from the filter cartridge one protrudes out of the cover body.

[0008] Further, the box two is provided with a driving mechanism, the driving mechanism comprises a rotating shaft two rotating in the channel one, one end of the rotating shaft two away from the box two is connected with a sleeve shaft one, one end of the sleeve shaft one away from the rotating shaft two is rotationally abutted with a sleeve shaft two, the outer arc walls of the sleeve shaft one and the sleeve shaft two are respectively fixedly connected with a plurality of annularly arrayed fixing plates, the fixing plates fixedly connected to the sleeve shaft one and the fixing plates fixedly connected to the sleeve shaft two are not located in the same horizontal plane, wherein the fixing plates fixedly connected to the sleeve shaft one are respectively fixedly connected to the top ends of the inner arc walls of the filter cartridge two away from the sleeve shaft one, and the fixing plates fixedly connected to the sleeve shaft two are respectively fixedly connected to the top ends of the inner arc walls of the filter cartridge one away from the sleeve shaft two.

[0009] Further, the fixing plates fixedly connected to the sleeve shaft one are fixedly connected with scrapers on the side wall of the box two away from the sleeve shaft one and close to the filter cartridge one, the scrapers are arranged on the side wall close to the outer arc wall of the filter cartridge one, and the scrapers and the ejector pin abut each other.

[0010] Further, the sleeve shaft one, the sleeve shaft two and the rotating shaft two are coaxially arranged with the channel one, and the sleeve shaft one, the sleeve shaft two and the rotating shaft two are hollow structures along the axial direction of the channel one, and the inside of each of the sleeve shaft one, the sleeve shaft two and the rotating shaft two is provided with the same rotating shaft one, wherein the rotating shaft one is freely rotatable with the sleeve shaft one and the rotating shaft two, the sleeve shaft two is freely slidable along the axial direction of the rotating shaft one on the outer arc wall of the rotating shaft one, one end of the rotating shaft two away from the sleeve shaft two is fixedly connected with a bevel gear three, and the bevel gear three is located in the box two.

[0011] Further, one end of the rotating shaft one away from the sleeve shaft two is fixedly connected with a bevel gear two, one side of one end of the bevel gear two and the bevel gear three close to each other is engaged with the same bevel gear one, one end of the bevel gear one away from the bevel gear two and the bevel gear three is fixedly connected with a motor, the motor is fixedly connected to the inner wall of the box two, the cross-sectional radius of a section of the rotating shaft one corresponding to the sleeve shaft two is greater than the cross-sectional radius of a section of the rotating shaft one away from the sleeve shaft two, and the two sections of the rotating shaft one are discontinuously connected at the abutment position of the sleeve shaft one and the sleeve shaft two.

[0012] Furthermore, a number of locking blocks 1 arranged in a circular array are fixedly connected to the side wall of the sleeve shaft 1 near the rotating shaft 2. A number of slots 1 arranged in a circular array are opened on the side wall of the rotating shaft 2 near the sleeve shaft 1. The number of locking blocks 1 corresponds one-to-one with the number of slots 1. A spline sleeve is provided on the outer arc wall of the rotating shaft 1 at the position corresponding to the sleeve shaft 2. A spline is provided on the inner arc wall of the sleeve shaft 2 to match the spline sleeve.

[0013] Furthermore, a water inlet pipe is provided on one side of the top of the outer arc wall of the housing, and a drain pipe is provided on one side of the bottom of the outer arc wall of the housing. Both the water inlet pipe and the drain pipe are interconnected with the interior of the housing. The end of the water inlet pipe that penetrates into the housing faces the interior of the filter cartridge and does not contact the drive mechanism.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Through the combination of ejector pin, compression spring and cover, when the scraper is driven by the drive mechanism to rotate, it can continuously abut against the ejector pin on the outer arc wall of the filter cartridge, thereby making the ejector pin clear the filter holes. This not only avoids the clogging of the filter holes, but also achieves automatic cleaning without stopping the machine, which improves the filtration efficiency and reduces the frequency of cleaning and replacing the filter element. This not only reduces maintenance costs, but also reduces production losses caused by stopping the machine to clean or replace the filter element.

[0016] 2. The drive mechanism enables filter cartridge one and filter cartridge two to rotate coaxially. This reverse rotation not only enhances the filtration effect but also creates turbulence in the wastewater inside the filter cartridge, further improving filtration efficiency. At the same time, the gap design between filter cartridge one and filter cartridge two increases the filtration area and improves the treatment capacity. Attached Figure Description

[0017] Figure 1 A cross-sectional view of the internal structure of an ultrafiltration device for water purification;

[0018] Figure 2 An exploded view of the filtration mechanism in an ultrafiltration device for water purification.

[0019] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0020] Figure 4 An exploded view of the drive mechanism in an ultrafiltration device for water purification.

[0021] Figure 5 This is a schematic diagram of the overall structure of an ultrafiltration device for water purification.

[0022] In the picture:

[0023] 10. Box 1; 11. Box 2; 12. Water inlet pipe; 13. Drain pipe;

[0024] 20. Motor; 21. Bevel gear one; 22. Bevel gear two; 23. Bevel gear three; 24. Shaft one; 25. Sleeve shaft one; 26. Sleeve shaft two; 27. Shaft two;

[0025] 30. Filter cartridge one; 31. Filter cartridge two; 32. Fixing plate; 33. Scraper; 34. Cover; 35. Compression spring; 36. Pin. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see the appendix Figures 1-5 This utility model provides an ultrafiltration device for water purification: it includes a housing 10 and a housing 2 11 fixedly connected to the top of the housing 10. Both housing 10 and housing 2 11 are hollow structures. A channel 1 penetrating the axial direction of housing 10 is provided at the center of the side wall of housing 10 and housing 2 11 that are close to each other. A filtration mechanism is provided inside housing 10, which includes a filter cartridge 30 and a filter cartridge 31 coaxially arranged inside housing 10. The cross-sectional radius of filter cartridge 30 is smaller than... The cross-sectional radius of filter cylinder 2 31 is such that filter cylinder 1 30 is located inside filter cylinder 2 31. There is a gap between the outer arc wall of filter cylinder 1 30 and the inner arc wall of filter cylinder 2 31. A cover 34 is fixedly connected to the filter hole opening on the outer arc wall of filter cylinder 1 30. A compression spring 35 is fixedly connected to the inner arc wall of cover 34. A pin 36 is fixedly connected to the end of the inner side of the compression spring 35 away from the outer arc wall of filter cylinder 1 30. The pin 36 is coaxially arranged with the filter hole at the corresponding position on the side wall of filter cylinder 1 30, and the length direction of the pin 36 is oriented towards the axis of filter cylinder 1 30.

[0028] It should be noted that: both housing 10 and housing 21 are cylindrical structures and are coaxially arranged. Channel 1 connects the interior of housing 10 and housing 21. At the same time, channel 1 provides a space for the movement of the drive mechanism's rotating shaft 24, sleeve shaft 25, sleeve shaft 26 and rotating shaft 27. The cross-sectional radius of the opening at the end of the cover 34 near the filter cartridge 30 is smaller than the cross-sectional radius of the opening at the end of the cover 34 away from the filter cartridge 30.

[0029] In the initial state, the ejector pin 36 is not located in the filter hole and does not block the filter hole. In one possible embodiment, the ejector pin 36 is teardrop-shaped, that is, the end of the ejector pin 36 near the axis of the filter cylinder 30 is a tapered end, and the end of the ejector pin 36 away from the axis of the filter cylinder 30 is a spherical end.

[0030] Considering the processing cost, in another possible embodiment, the ejector pin 36 is composed of two parts, the end closer to the axis of the filter cartridge 30 is frustum-shaped, and the end farther from the axis of the filter cartridge 30 is hemispherical. The cover 34, the compression spring 35 and the ejector pin 36 are all made of corrosion-resistant materials.

[0031] All of the above are to minimize the resistance of the ejector pin 36 to the water flow after the wastewater enters the filter cartridge 30 and is filtered out from the side wall of the filter cartridge 30, thereby reducing the impact of the water flow on the pressure spring 35 and the ejector pin 36. The streamlined structure of the ejector pin 36 can reduce the water flow resistance it receives, while the cover 34 is to protect the circumference of the ejector pin 36.

[0032] Please see the appendix Figure 1 To be continued Figure 5 This utility model provides a technical solution: the ends of the first filter cylinder 30 and the second filter cylinder 31 away from the second housing 11 are both closed. The outer arc walls of the first filter cylinder 30 and the second filter cylinder 31 are provided with uniformly distributed filter holes, and the filter holes are arranged radially through the first filter cylinder 30 and the second filter cylinder 31 along the first housing 10. The axial height of the first filter cylinder 30 is less than the axial height of the second filter cylinder 31. The length direction of the cover 34 is arranged radially along the first filter cylinder 30. The cover 34 and the ejector pin 36 are coaxially arranged. The axial length of the cover 34 is much less than the axial length of the ejector pin 36. The end of the ejector pin 36 away from the first filter cylinder 30 protrudes from the cover 34.

[0033] It should be noted that the cross-sectional radius of the filter holes on filter cartridge 30 is larger than that on filter cartridge 31. The fluid flows in from the axis of filter cartridge 30, passes through the filter holes and enters the space between filter cartridge 30 and filter cartridge 31, thereby initially removing large-volume impurities or particles from the fluid. Then, the fluid is further removed by filter cartridge 31.

[0034] Please see the appendix Figure 1 To be continued Figure 5The present invention provides a technical solution: the housing 21 is provided with a driving mechanism, the driving mechanism includes a rotating shaft 27 rotating in the channel 1, the end of the rotating shaft 27 away from the housing 21 is engaged with a sleeve shaft 25, the end of the sleeve shaft 25 away from the rotating shaft 27 is rotatably abutted against a sleeve shaft 26, a plurality of fixed plates 32 arranged in a ring array are fixedly connected to the outer arc wall of the sleeve shaft 25 and the sleeve shaft 26 respectively, the fixed plates 32 fixedly connected to the sleeve shaft 25 and the fixed plates 32 fixedly connected to the sleeve shaft 26 are not located in the same horizontal plane, wherein the end of the fixed plate 32 fixedly connected to the sleeve shaft 25 away from the sleeve shaft 25 is fixedly connected to the top of the inner arc wall of the filter cartridge 21 respectively, and the end of the fixed plate 32 fixedly connected to the sleeve shaft 26 away from the sleeve shaft 26 is fixedly connected to the top of the inner arc wall of the filter cartridge 10 respectively.

[0035] It should be noted that: both filter cylinder 1 30 and filter cylinder 2 31 have a channel 2 that runs through the axial direction of the box 1 10 at the center of the side wall away from the box 2 11. The end of the sleeve shaft 1 25 away from the rotating shaft 27 is fixed in the channel 2 on filter cylinder 1 30, and the end of the sleeve shaft 2 26 away from the sleeve shaft 1 25 is fixed in the channel 2 on filter cylinder 2 31. That is, the filter cylinder 1 30 and filter cylinder 2 31 are axially supported at both ends. No filter holes are provided on the end faces of filter cylinder 1 30 and filter cylinder 2 31 away from the box 2 11.

[0036] Please see the appendix Figure 1 To be continued Figure 5 The present invention provides a technical solution: a scraper 33 is fixedly connected to the side wall of the fixing plate 32, which is fixedly connected to the sleeve shaft 25 away from the box body 11, and close to the filter cylinder 30. The scraper 33 is set close to the outer arc wall of the filter cylinder 30, and the scraper 33 abuts against the ejector pin 36.

[0037] It should be noted that when the first sleeve shaft 25 and the second sleeve shaft 26 rotate respectively, driving the first filter cylinder 30 and the second filter cylinder 31 to rotate, the scraper 33 on the fixed plate 32 fixedly connected to the second filter cylinder 31 will rotate around the outside of the first filter cylinder 30, and then abut against the ejector pin 36, forcing the ejector pin 36 to extend into the filter hole and thus clear the filter hole and prevent blockage.

[0038] Please see the appendix Figure 1 To be continued Figure 5The present invention provides a technical solution: the first sleeve shaft 25, the second sleeve shaft 26, and the second rotating shaft 27 are all coaxially arranged with the channel, and the first sleeve shaft 25, the second sleeve shaft 26, and the second rotating shaft 27 are all hollow structures along the first axis of the channel. The same rotating shaft 24 is provided on the inner side of each of the three, wherein the first rotating shaft 24 can rotate freely with the first sleeve shaft 25 and the second rotating shaft 27. The second sleeve shaft 26 can slide freely on the outer arc wall of the first rotating shaft 24 along the axial direction of the first rotating shaft 24. A bevel gear 23 is fixedly connected to the end of the second rotating shaft 27 away from the second sleeve shaft 26. The bevel gear 23 is located inside the housing 11.

[0039] It should be noted that: the second rotating shaft 27 rotates within the first channel, while the first sleeve shaft 25 and the second sleeve shaft 26 are located within the first housing 10. The second rotating shaft 27 does not contact the first filter cartridge 30 or the second filter cartridge 31.

[0040] Please see the appendix Figure 1 To be continued Figure 5 This utility model provides a technical solution: a bevel gear 22 is fixedly connected to one end of the outer arc wall of the rotating shaft 24 away from the sleeve shaft 26. The same bevel gear 21 is meshed on one side of the end of the bevel gear 22 and the bevel gear 3 23 that are close to each other. A motor 20 is fixedly connected to the end of the bevel gear 21 away from the bevel gear 22 and the bevel gear 3 23. The motor 20 is fixedly connected to the inner wall of the housing 2 11. The cross-sectional radius of the section of the outer arc wall of the rotating shaft 24 corresponding to the sleeve shaft 26 is greater than the cross-sectional radius of the section of the rotating shaft 24 away from the sleeve shaft 26. The two sections of the rotating shaft 24 are separated by the rotating contact point of the sleeve shaft 25 and the sleeve shaft 26, forming a cliff-like transition.

[0041] It should be noted that bevel gear 22 and bevel gear 32 are arranged opposite each other, meaning that the ends of both that are close to each other have smaller cross-sectional radii. When motor 20 starts, the transmission of bevel gear 121, bevel gear 22, and bevel gear 33 drives shaft 124, sleeve shaft 125, sleeve shaft 226, and shaft 27 to rotate. Since sleeve shaft 125 and sleeve shaft 226 are respectively fixedly connected to fixing plates 32, and fixing plates 32 are respectively fixedly connected to the top of the inner arc wall of filter cartridge 21 and filter cartridge 10, filter cartridge 10 and filter cartridge 21 will rotate with the rotation of sleeve shaft 125 and sleeve shaft 226. Furthermore, since bevel gear 22 and bevel gear 33 are oriented differently, filter cartridge 10 and filter cartridge 21 will achieve coaxial reverse rotation.

[0042] Please see the appendix Figure 1 To be continued Figure 5The present invention provides a technical solution: a plurality of locking blocks 1 arranged in a ring array are fixedly connected to the side wall of the sleeve shaft 25 near the rotating shaft 27; a plurality of slots 1 arranged in a ring array are opened on the side wall of the rotating shaft 27 near the sleeve shaft 25; the plurality of locking blocks 1 correspond one-to-one with the plurality of slots 1; a spline sleeve is provided on the outer arc wall of the rotating shaft 24 at the position corresponding to the sleeve shaft 26; and a spline adapted to the spline sleeve is provided on the inner arc wall of the sleeve shaft 26.

[0043] It should be noted that: the first sleeve 25 is engaged with the slot 1 on the second rotating shaft 27 through the first locking block 1, thereby transmitting the torque of the second rotating shaft 27. The spline sleeve on the outer arc wall of the first rotating shaft 24 and the spline on the inner arc wall of the second sleeve 26 allow the second sleeve 26 to slide freely along the axial direction of the first rotating shaft 24 while also transmitting the torque of the first rotating shaft 24.

[0044] The end of the rotating shaft 24 away from the housing 11 is located outside the filter cartridge 31. A fixing bolt is fixedly connected to the center of the side wall of the rotating shaft 24 away from the housing 11. A fixing cover is threaded on the outside of the fixing bolt. The fixing cover abuts against the side of the sleeve shaft 26 away from the housing 11, thereby preventing the sleeve shaft 26 from detaching from the rotating shaft 24.

[0045] Please see the appendix Figure 1 To be continued Figure 5 Figure 1 Figure 5 The present invention provides a technical solution: a water inlet pipe 12 is provided on one side of the top of the outer arc wall of the box 10, and a drain pipe 13 is provided on one side of the bottom of the outer arc wall of the box 10. Both the water inlet pipe 12 and the drain pipe 13 are interconnected with the interior of the box 10. The end of the water inlet pipe 12 that penetrates into the box 10 is set towards the interior of the filter cartridge 30 and does not contact the drive mechanism.

[0046] It should be noted that both the inlet pipe 12 and the drain pipe 13 are equipped with solenoid valves.

[0047] Working principle:

[0048] When motor 20 starts, it drives shaft 24, sleeve shaft 25, sleeve shaft 26, and shaft 27 to rotate through the transmission of bevel gear 1 21, bevel gear 22, and bevel gear 3 23. Since sleeve shaft 1 25 and sleeve shaft 2 26 are respectively fixedly connected to fixing plates 32, and fixing plates 32 are respectively fixedly connected to the top of the inner arc wall of filter cartridge 2 31 and filter cartridge 1 30, filter cartridge 1 30 and filter cartridge 2 31 will rotate with the rotation of sleeve shaft 1 25 and sleeve shaft 2 26. And since bevel gear 2 22 and bevel gear 3 23 are oriented differently, filter cartridge 1 30 and filter cartridge 2 31 will achieve coaxial reverse rotation.

[0049] Wastewater flows in from the axis of filter cartridge 30 and enters between filter cartridge 30 and filter cartridge 31 through the filter holes, thereby initially removing large-volume impurities or particles from the fluid. Then, filter cartridge 31 further removes larger-volume impurities or particles from the fluid. When the sleeve shaft 25 and sleeve shaft 26 rotate respectively, driving filter cartridge 30 and filter cartridge 31 to rotate, the scraper 33 on the fixed plate 32 fixedly connected to filter cartridge 31 will rotate around the outside of filter cartridge 30, and then abut against the ejector pin 36, forcing the ejector pin 36 to extend into the filter hole and thus clear the filter hole and prevent blockage.

Claims

1. An ultrafiltration device for water purification, comprising a housing 1 (10) and a housing 2 (11) fixedly connected to the top of the housing 1 (10), wherein both the housing 1 (10) and the housing 2 (11) are hollow structures, and a channel 1 penetrating along the axial direction of the housing 1 (10) is provided at the center of the side wall of the housing 1 (10) and the housing 2 (11) that are close to each other, characterized in that: The housing (10) is equipped with a filtration mechanism, which includes a filter cylinder (30) and a filter cylinder (31) coaxially arranged inside the housing (10). The cross-sectional radius of the filter cylinder (30) is smaller than that of the filter cylinder (31), and the filter cylinder (30) is located inside the filter cylinder (31). There is a gap between the outer arc wall of the filter cylinder (30) and the inner arc wall of the filter cylinder (31). A cover (34) is fixedly connected to the filter hole opening on the outer arc wall of the filter cylinder (30). A compression spring (35) is fixedly connected to the inner arc wall of the cover (34). A pin (36) is fixedly connected to the end of the inner side of the compression spring (35) away from the outer arc wall of the filter cylinder (30). The pin (36) is coaxially arranged with the filter hole at the corresponding position on the side wall of the filter cylinder (30), and the length direction of the pin (36) is oriented towards the axis of the filter cylinder (30).

2. The ultrafiltration device for water purification as described in claim 1, characterized in that: The ends of the first filter cylinder (30) and the second filter cylinder (31) away from the second housing (11) are both closed. The outer arc walls of the first filter cylinder (30) and the second filter cylinder (31) are provided with uniformly distributed filter holes, and the filter holes are arranged to penetrate the first filter cylinder (30) and the second filter cylinder (31) radially along the first housing (10). The axial height of the first filter cylinder (30) is less than the axial height of the second filter cylinder (31). The length direction of the cover (34) is arranged radially along the first filter cylinder (30). The cover (34) and the ejector pin (36) are coaxially arranged. The axial length of the cover (34) is much less than the axial length of the ejector pin (36). The end of the ejector pin (36) away from the first filter cylinder (30) protrudes from the cover (34).

3. The ultrafiltration device for water purification as described in claim 1, characterized in that: The housing 2 (11) is equipped with a driving mechanism, which includes a rotating shaft 2 (27) that rotates within the channel 1. One end of the rotating shaft 2 (27) away from the housing 2 (11) is engaged with a sleeve shaft 1 (25). The other end of the sleeve shaft 1 (25) away from the rotating shaft 2 (27) rotatably abuts against a sleeve shaft 2 (26). Several fixed plates (32) arranged in a circular array are fixedly connected to the outer arc walls of the sleeve shaft 1 (25) and the sleeve shaft 2 (26), respectively. The fixing plate (32) on the first (25) and the fixing plate (32) fixedly connected to the second (26) are not located in the same horizontal plane. The end of the fixing plate (32) fixedly connected to the first (25) is fixedly connected to the top of the inner arc wall of the second (31) filter cylinder, and the end of the fixing plate (32) fixedly connected to the second (26) is fixedly connected to the top of the inner arc wall of the first (30) filter cylinder.

4. The ultrafiltration device for water purification as described in claim 3, characterized in that: A scraper (33) is fixedly connected to the side wall of the fixed plate (32) that is away from the housing (11) and close to the filter cylinder (30). The scraper (33) is located on the side wall of the filter cylinder (30) that is close to the outer arc wall of the filter cylinder (30). The scraper (33) and the ejector pin (36) abut against each other.

5. The ultrafiltration device for water purification as described in claim 4, characterized in that: The first sleeve shaft (25), the second sleeve shaft (26), and the second rotating shaft (27) are all coaxially arranged with the channel. The first sleeve shaft (25), the second sleeve shaft (26), and the second rotating shaft (27) are all hollow structures along the axial direction of the channel. The same rotating shaft (24) is provided on the inner side of each of the three. The first rotating shaft (24) can rotate freely with the first sleeve shaft (25) and the second rotating shaft (27). The second sleeve shaft (26) can slide freely on the outer arc wall of the first rotating shaft (24) along the axial direction of the first rotating shaft (24). The end of the second rotating shaft (27) away from the second sleeve shaft (26) is fixedly connected to the third bevel gear (23), which is located inside the second housing (11).

6. The ultrafiltration device for water purification as described in claim 5, characterized in that: A bevel gear 2 (22) is fixedly connected to one end of the outer arc wall of the rotating shaft 1 (24) away from the sleeve shaft 2 (26). The same bevel gear 1 (21) is meshed with one side of the end of the bevel gear 2 (22) and the bevel gear 3 (23) that are close to each other. A motor (20) is fixedly connected to the end of the bevel gear 1 (21) away from the bevel gear 2 (22) and the bevel gear 3 (23). The motor (20) is fixedly connected to the inner wall of the housing 2 (11). The cross-sectional radius of the section of the outer arc wall of the rotating shaft 1 (24) corresponding to the sleeve shaft 2 (26) is greater than the cross-sectional radius of the section of the rotating shaft 1 (24) away from the sleeve shaft 2 (26). The two sections of the rotating shaft 1 (24) are separated by the rotating contact point of the sleeve shaft 1 (25) and the sleeve shaft 2 (26), forming a cliff-like transition.

7. The ultrafiltration device for water purification as described in claim 5, characterized in that: Several locking blocks are fixedly connected to the side wall of the sleeve shaft one (25) near the rotating shaft two (27) in a circular array. Several slots are provided on the side wall of the rotating shaft two (27) near the sleeve shaft one (25) in a circular array. Several locking blocks correspond one-to-one with several slots. A spline sleeve is provided on the outer arc wall of the rotating shaft one (24) at the position corresponding to the sleeve shaft two (26). A spline is provided on the inner arc wall of the sleeve shaft two (26) to match the spline sleeve.

8. The ultrafiltration device for water purification as described in claim 1, characterized in that: A water inlet pipe (12) is provided on one side of the top of the outer arc wall of the first box (10), and a drain pipe (13) is provided on one side of the bottom of the outer arc wall of the first box (10). Both the water inlet pipe (12) and the drain pipe (13) are connected to the interior of the first box (10). The end of the water inlet pipe (12) that penetrates into the first box (10) is set towards the interior of the first filter cartridge (30) and does not contact the drive mechanism.

Images