An automatic filtering device and process for lithium-containing industrial brine

Abstract

The present invention belongs to the technical field of industrial brine filtration, and specifically relates to an automatic filtration device and process for lithium-containing industrial brine, including a workbench. Lifting devices are symmetrically arranged above the workbench, and a driving device is jointly arranged between the symmetrically arranged lifting devices. A primary cleaning device is arranged at the middle position of the lower end of the lifting device, a secondary cleaning device is arranged on the periphery of the lower end of the lifting device, and a tertiary cleaning device is arranged outside the secondary cleaning device at the lower end of the lifting device. In the present invention, the lifting device drives the primary cleaning device, the secondary cleaning device, and the tertiary cleaning device to move to the designated processing position, and then the driving device is used to control the primary cleaning device, the secondary cleaning device, and the tertiary cleaning device to clean the filter cartridge, solving the problem that a large amount of corrosive crystals are deposited on the wall of the traditional filter cartridge and improving the service life of the filter cartridge.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial brine filtration, and particularly relates to an automatic filtration device and process for lithium-containing industrial brine. Background Art

[0002] Industrial brine, commonly known as bittern, bitter brine, and brine alkali, is an aqueous solution of salts such as chlorides, sulfates, and soluble carbonates. It is the mother liquor remaining in the salt pond after seawater or salt lake water is used to produce table salt through chemical reactions and physical methods, and contains important metal ions to be extracted, such as lithium ions.

[0003] The existing filtration equipment has the following problems in the process of extracting lithium ions: 1. For the extraction of lithium ions, generally, the brine is filtered and then corresponding chemical reactants are added for extraction. However, the brine contains lithium chloride with strong volatility and hygroscopicity. Under the premise of long-term filtration, a large amount of lithium chloride and other chemical substances that corrode the barrel wall adhere to the barrel wall of the filter cartridge of the filtration equipment, thus causing serious corrosion to the barrel wall of the filter cartridge in the filtration equipment; 2. In the extraction of lithium from brine, the nanofiltration membrane technology is usually used to perform nanofiltration treatment on the brine. However, the surface of the nanofiltration membrane is in the brine environment for a long time, so the pores on its surface are easily blocked by the crystalline substances precipitated from the brine, thereby affecting the nanofiltration effect of the nanofiltration membrane and the efficiency of lithium extraction from brine. Summary of the Invention

[0004] In order to achieve the above object, the present invention adopts the following technical solutions. An automatic filtration device for lithium-containing industrial brine includes a workbench. Lifting devices are symmetrically arranged above the workbench. A driving device is commonly arranged between the symmetrically arranged lifting devices. A primary cleaning device is arranged at the middle position of the lower end of the lifting device. A secondary cleaning device is arranged on the periphery of the lower end of the lifting device. A tertiary cleaning device is arranged outside the secondary cleaning device at the lower end of the lifting device.

[0005] The lifting device includes support plates, through grooves, triangular frames, cross plates, sliding blocks, L-shaped bases, shaft platforms, fixed disks, and fixed seats. Support plates are symmetrically installed on the left and right sides of the upper end of the workbench. Through grooves are formed in the middle positions of the support plates. Triangular frames are installed on the upper end surfaces of the left and right ends of the support plates. A cross plate is commonly installed above between the triangular frames at the left and right ends. Sliding blocks are slidably installed on the inner walls of the vertical sections of the triangular frames. An L-shaped base is installed at one end of the sliding block close to the center line of the workbench. A shaft platform is installed at the lower end of the L-shaped base. A fixed disk is installed at the lower end of the shaft platform. Fixed seats are symmetrically installed on the upper end surface of the cross plate.

[0006] As a preferred technical solution of the present invention, the driving device includes a driving motor, a trapezoidal groove, a connecting rod, a toothed belt pulley, a toothed belt and a fixing column. A driving motor is installed at the middle position of the upper end surface of the cross plate. Trapezoidal grooves symmetrical left and right are formed in the cross plate. The vertical section of the L-shaped base is rotatably installed with a connecting rod that penetrates both the trapezoidal groove, the shaft platform and the fixing disk. Tooth belt pulleys are installed on the outer wall of the upper end of the connecting rod and the output shaft of the driving motor, and a toothed belt is installed between the toothed belt pulleys. A fixing column is installed at the lower end of the connecting rod.

[0007] As a preferred technical solution of the present invention, the primary cleaning device includes a cleaning roller, a fixing plate, a filter cartridge, a first cleaning brush, a heating ring, a nanofiltration membrane, a conduit, a first gear and a second gear. A cleaning roller that penetrates the bottom wall of the filter cartridge is installed at the lower end of the fixing column. A fixing plate is installed at a position of the workbench close to the support plate. Filter cartridges located directly below the connecting rod are symmetrically installed left and right on the fixing plate. First cleaning brushes with uneven heights are uniformly installed on the outer wall of the middle of the cleaning roller along the circumference through columns, and the tightness of the brush hairs of the first cleaning brushes increases sequentially along the circumference. A heating ring is installed on the outer wall of the lower end of the cleaning roller. Nanofiltration membranes are uniformly installed along the circumference on the inner bottom wall of the filter cartridge. A conduit that is connected to the nanofiltration membrane and rotatably installed on the outer wall of the bottom of the filter cartridge is installed at the lower end of the nanofiltration membrane. A first gear is installed on the outer wall of the lower end of the cleaning roller, and a second gear meshing with the first gear is installed on the outer wall of the conduit.

[0008] As a preferred technical solution of the present invention, the secondary cleaning device includes a third gear, a sleeve, a fourth gear, a cylindrical cavity, a telescopic arc-shaped member, a conical head, a positioning plate and an arc-shaped plate. A third gear is installed on the outer wall of the fixing column. Sleeves are uniformly installed along the circumference at the lower end of the fixing disk. A fourth gear meshing with the third gear is installed on the outer wall of the upper end of the sleeve. Cylindrical cavities are uniformly installed along the circumference on the inner wall of the lower end of the sleeve. A telescopic arc-shaped member is slidably installed between the cylindrical cavity and the outer wall of the lower end of the sleeve. Conical heads are uniformly installed at one end of the telescopic arc-shaped member close to the axis of the sleeve. Three positioning plates are uniformly installed along the circumference on the outer periphery of the lower end surface of the fixing disk. An arc-shaped plate is installed at one end of the lower end of the positioning plate close to the axis of the fixing disk.

[0009] As a preferred technical solution of the present invention, the three - stage cleaning device includes a fifth gear, an internal gear, an opening plate, a connecting column, a second cleaning brush, a second scraper, a telescopic rod, a rectangular groove, and an extrusion plate. The lower end of the fixed disk is installed with a fifth gear through a rotating shaft. The lower end of the fixed disk is installed with an internal gear meshing with the fifth gear. The lower end of the internal gear is evenly installed with opening plates along its circumference. The middle position of the lower end of the opening plate is installed with a connecting column. The outer wall of the lower end of the connecting column and the outer wall and the lower end surface opposite to the filter cartridge are symmetrically installed with a second cleaning brush and a second scraper. A telescopic rod passing through the opening plate is slidably installed inside the connecting column. A through - rectangular groove is opened at the middle position of the connecting column. Symmetrically installed on the outer wall of the middle position of the telescopic rod are extrusion plates located in the rectangular groove section.

[0010] As a preferred technical solution of the present invention, telescopic extrusion members slidably installed symmetrically in the rectangular groove and slidably cooperating with the outer wall of the connecting column are provided. An arc - shaped block is installed at the lower end of the telescopic extrusion member. A third cleaning brush is installed on the arc - shaped block, and the bristles of the third cleaning brush are tighter than those of the second cleaning brush.

[0011] As a preferred technical solution of the present invention, a heating ring is installed on the outer wall of the lower end of the sleeve. The lower end surface of the sleeve is evenly installed with first scrapers along its circumference. A limiting block cooperating with the telescopic rod is installed on the outer wall of the middle position of the positioning plate.

[0012] As a preferred technical solution of the present invention, the maximum telescopic distance of the conical head just contacts the surface of the nanofiltration membrane.

[0013] As a preferred technical solution of the present invention, the hollow height inside the sleeve is slightly greater than the height of the nanofiltration membrane. The fourth gear is always in meshing with the third gear during the sliding process.

[0014] The present invention also provides an anti - corrosion process for an automatic filtration device for lithium - containing industrial brine, including the following steps: S1: First, drive the lifting device through a driving device to move the secondary cleaning device and the tertiary cleaning device to the designated processing position;

[0015] S2: Then, while the primary cleaning device is working, drive the secondary cleaning device to simultaneously perform cleaning and scraping treatment on the corresponding area;

[0016] S3: Finally, perform scraping and anti - corrosion treatment on the inner wall of the filter cartridge through the tertiary cleaning device.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention drives the internal gear through the fifth gear to synchronously drive the second cleaning brush and the second scraper to perform a periodic scraping and then cleaning process on the wall of the filter cartridge, effectively reducing the large amount of corrosive crystals or corrosive substance-containing liquids adhered to the wall of the filter cartridge after long-term operation, increasing the service life of the filter cartridge, and reducing the manufacturing cost of enterprise production.

[0019] 2. The present invention performs a cleaning and oscillation process on the surface of the nanofiltration membrane during rotation through the telescopic arc-shaped member that rotates synchronously with the fixed column but at different speeds, solving the problem of a large amount of filter crystallization blocking the surface of the nanofiltration membrane in traditional filtration equipment, improving the filtration efficiency and effect of the nanofiltration membrane, and then further cleaning the surface of the nanofiltration membrane through the first cleaning brush, and the first cleaning brush strengthens the uniformity of the flow of various ions in the brine inside the filter cartridge during the filtration process.

[0020] 3. During the rotation following the internal gear, the telescopic rod moves relative to the limit block and is compressed, thereby driving the telescopic extrusion member to drive the third cleaning brush to self-clean the corrosive substances scraped off by the second cleaning brush and the second scraper, ensuring that the contact between the second cleaning brush and the second scraper and the wall of the filter cartridge is in a clean state at each time point, and improving the cleaning ability of the second cleaning brush on the wall of the filter cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a schematic diagram of the partial structures of the lifting device, driving device, primary cleaning device and secondary cleaning device of the present invention.

[0023] Figure 3 It is a schematic diagram of the partial structures of the secondary cleaning device and the tertiary cleaning device of the present invention.

[0024] Figure 4 It is a schematic diagram of the partial structure of the secondary cleaning device of the present invention.

[0025] Figure 5 It is an enlarged schematic diagram of the partial structure at A in the attached Figure 4 of the present invention.

[0026] Figure 6 It is a schematic diagram of the partial structure of the tertiary cleaning device of the present invention.

[0027] Figure 7 It is a cross-sectional view of the partial structure of the tertiary cleaning device of the present invention.

[0028] Figure 8 It is an attached Figure 7 schematic diagram from another perspective of the present invention.

[0029] Figure 9It is a partial structural sectional view of the secondary cleaning device and the tertiary cleaning device of the present invention.

[0030] Figure 10 It is a schematic diagram of the partial structure of the primary cleaning device of the present invention.

[0031] Reference numerals in the figure: 1, workbench; 2, lifting device; 21, support plate; 22, through groove; 23, tripod; 24, cross plate; 25, sliding block; 26, L-shaped base; 27, shaft platform; 28, fixed disk; 29, fixed seat; 3, driving device; 31, driving motor; 32, trapezoidal groove; 33, connecting rod; 34, toothed belt pulley; 35, toothed belt; 36, fixed column; 4, primary cleaning device; 41, cleaning roller; 42, fixing plate; 43, filter cartridge; 44, first cleaning brush; 45, heating ring; 46, nanofiltration membrane; 47, conduit; 48, first gear; 49, second gear; 5, secondary cleaning device; 51, third gear; 52, sleeve; 521, first scraping plate; 522, limit block; 53, fourth gear; 54, cylindrical cavity; 55, telescopic arc-shaped member; 56, conical head; 57, positioning plate; 58, arc-shaped plate; 6, tertiary cleaning device; 61, fifth gear; 62, internal gear; 63, opening plate; 64, connecting column; 65, second cleaning brush; 66, second scraping plate; 67, telescopic rod; 68, rectangular groove; 681, telescopic extrusion member; 682, arc-shaped block; 683, third cleaning brush; 69, extrusion plate. Specific embodiments

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that the terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0034] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0035] Refer to Figure 1 and Figure 3 It can be seen that an automatic filtering device for lithium-containing industrial brine includes a workbench 1, lifting devices 2 are symmetrically arranged above the workbench 1, a driving device 3 is jointly arranged between the symmetrically arranged lifting devices 2, a primary cleaning device 4 is arranged at the middle position of the lower end of the lifting device 2, a secondary cleaning device 5 is arranged on the outer periphery of the lower end of the lifting device 2, and a tertiary cleaning device 6 is arranged at the lower end of the lifting device 2 and located outside the secondary cleaning device 5;

[0036] Refer to Figure 1and Figure 2 It can be seen that the lifting device 2 includes a support plate 21, a through groove 22, a triangular frame, a cross plate 24, a sliding block 25, an L-shaped base 26, a shaft platform 27, a fixing plate 28 and a fixing seat 29. Support plates 21 are symmetrically installed on the left and right sides at the upper end of the workbench 1. A through groove 22 is provided at the middle position of the support plate 21. Triangular frames 23 are installed on the upper end surfaces of the support plates 21 at both left and right ends. A cross plate 24 is jointly installed above between the triangular frames 23 at both left and right ends. A sliding block 25 is slidably installed on the inner wall of the vertical section of the triangular frame. An L-shaped base 26 is installed at one end of the sliding block 25 close to the center line of the workbench 1. A shaft platform 27 is installed at the lower end of the L-shaped base 26. A fixing plate 28 is installed at the lower end of the shaft platform 27. Fixing seats 29 are symmetrically installed on the upper end surface of the cross plate 24 at the left and right sides;

[0037] Refer to Figure 1 、 Figure 2 and Figure 3 It can be seen that the driving device 3 includes a driving motor 31, a trapezoidal groove 32, a connecting rod 33, a toothed belt pulley 34, a toothed belt 35 and a fixing column 36. The driving motor 31 is installed at the middle position of the upper end surface of the cross plate 24. Symmetric trapezoidal grooves 32 are provided on the cross plate 24. The vertical section of the L-shaped base 26 is rotatably installed through an ear seat with a connecting rod 33 that penetrates both the trapezoidal groove 32 and the shaft platform 27 and the fixing plate 28, and the connecting rod 33 and the fixing seat 29 are rotatably installed. Toothed belt pulleys 34 are installed on the outer wall of the upper end of the connecting rod 33 and the output shaft of the driving motor 31. A toothed belt 35 is installed between the toothed belt pulleys 34. A fixing column 36 is installed at the lower end of the connecting rod 33.

[0038] First, the support plate 21 cooperates with the workbench 1 and the triangular frame to provide a relatively stable support and installation environment for the symmetrically arranged left and right lifting device 2. During specific operation, the L-shaped bottom plate is driven by the sliding block 25 to reciprocate up and down to a specified position. Specifically, the sliding block 25 can be driven by an electric slider. Then, the longitudinal height of the shaft platform 27 provides a buffer distance for the longitudinal movement of the secondary cleaning device 5 and the tertiary cleaning device 6 on the fixing plate 28;

[0039] Then, the fixing seat 29 provides stable support for the rotating connecting rod 33, and the rotating connecting rod 33 provides guidance for the sliding of the sliding block 25 while rotating, reducing the vibration generated during the rotation of the connecting rod 33 that affects the stable operation of the primary cleaning device 4, the secondary cleaning device 5 and the tertiary cleaning device 6, thus causing problems such as incomplete cleaning or poor cleaning effect of the filtering device;

[0040] Finally, the driving motor 31 drives the belt pulley 34 to drive the connecting rod 33 to rotate synchronously through the toothed belt 35, so that the fixed column 36 can drive the primary cleaning device 4 to clean the brine filtration equipment. During this process, the secondary cleaning device 5 and the tertiary cleaning device 6 clean the filtration equipment synchronously, that is, different-level cleaning mechanisms are simultaneously driven by a single driving force to clean the filtration equipment, effectively improving the energy utilization rate and facilitating the operator to precisely and real-time control the equipment.

[0041] Refer to Figure 1 、 Figure 2 and Figure 10 It can be known that the primary cleaning device 4 includes a cleaning roller 41, a fixing plate 42, a filter cartridge 43, a first cleaning brush 44, a heating ring 45, a nanofiltration membrane 46, a conduit 47, a first gear 48 and a second gear 49. The cleaning roller 41 is installed at the lower end of the fixed column 36 and penetrates through the bottom wall of the filter cartridge 43. The fixing plate 42 is installed at a position on the workbench 1 close to the support plate 21. The filter cartridges 43 are symmetrically installed on the left and right sides of the fixing plate 42 and are located directly below the connecting rod 33. The first cleaning brushes 44 with uneven heights are evenly installed on the outer wall of the middle part of the cleaning roller 41 along the circumferential direction through the support columns, and the tightness of the brush hairs of the first cleaning brushes 44 increases incrementally along the circumferential direction. The heating ring 45 is installed on the outer wall of the lower end of the cleaning roller 41. The nanofiltration membranes 46 are evenly installed on the inner wall of the bottom of the filter cartridge 43 along the circumferential direction. The lower end of the nanofiltration membrane 46 is installed with a conduit 47 that is connected to it and is rotatably installed on the outer wall of the bottom of the filter cartridge 43. The first gear 48 is installed on the outer wall of the lower end of the cleaning roller 41. The second gear 49 that meshes with the first gear 48 is installed on the outer wall of the conduit 47;

[0042] Refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 6 It can be known that the secondary cleaning device 5 includes a third gear 51, a sleeve 52, a fourth gear 53, a cylindrical cavity 54, a telescopic arc-shaped member 55, a conical head 56, a positioning plate 57 and an arc-shaped plate 58. The third gear 51 is installed on the outer wall of the fixed column 36. The sleeves 52 are evenly installed on the lower end of the fixed disk 28 along its circumferential direction. The fourth gear 53 that meshes with the third gear 51 is installed on the outer wall of the upper end of the sleeve 52. The cylindrical cavities 54 are evenly installed on the inner wall of the lower end of the sleeve 52 along its circumferential direction. The telescopic arc-shaped member 55 is slidably installed between the cylindrical cavity 54 and the outer wall of the lower end of the sleeve 52. The conical heads 56 are evenly installed at one end of the telescopic arc-shaped member 55 close to the axis of the sleeve 52. Three positioning plates 57 are evenly installed on the outer periphery of the lower end face of the fixed disk 28 along its circumferential direction. The arc-shaped plate 58 is installed at one end of the positioning plate 57 close to the axis of the fixed disk 28 at the lower end;

[0043] Refer to Figure 3 and Figure 4It can be seen that the inner hollow height of the sleeve 52 is slightly greater than the height of the nanofiltration membrane 46. The fourth gear 53 is always in mesh with the third gear 51 during the sliding process. A heating ring 45 is installed on the outer wall of the lower end of the sleeve 52, and a first scraper 521 is uniformly installed on the lower end surface of the sleeve 52 along its circumference.

[0044] Refer to Figure 3 and Figure 5 It can be seen that the maximum telescopic distance of the conical head 56 just contacts the surface of the nanofiltration membrane 46.

[0045] During specific operation, the fixed column 36 provides a driving source for the cleaning roller 41 to drive the first cleaning brush 44 to rotate. Then, during the rotation of the first cleaning brush 44, its brush head continuously contacts (and has relative movement) with the surface of the nanofiltration membrane 46. At the same time, through the first cleaning brush 44 with different degrees of tightness, the deposition of crystals or insoluble substances on the surface of the nanofiltration membrane 46 is intensively cleaned, improving the cleanliness of the surface of the nanofiltration membrane 46, ensuring the filtration effect of the nanofiltration membrane 46, and extending the service life of the nanofiltration membrane 46.

[0046] At the same time, under the action of the conduit 47, the nanofiltration membrane 46 synchronously rotates at a different speed from the first cleaning brush 44 (the first gear 48 has relative movement with the second gear 49 under the action of the fixed column 36), so as to ensure that every position of the nanofiltration membrane 46 can be cleaned by the first cleaning brush 44. And at this time, when the fourth gear 53 and the third gear 51 have relative movement (the sleeve 52 follows the fixed disk 28 and moves downward to the specified position under the action of the sliding block 25), the sleeve 52 synchronously drives the telescopic arc-shaped member 55 to rotate. When the telescopic arc-shaped member 55 rotates, it continuously contacts and presses against the arc-shaped plate 58 fixed by the positioning plate 57, so that the telescopic arc-shaped member 55 continuously drives the conical head 56 to perform expansion and contraction movements (the conical head 56 continuously performs crushing treatment on the crystals on the surface of the nanofiltration membrane 46 to facilitate the cleaning by the first cleaning brush 44). And while the sleeve 52 rotates, the nanofiltration membrane 46 also rotates, further ensuring that the crystals at different positions on the surface of the nanofiltration membrane 46 can be crushed by the conical head 56.

[0047] Through the design of the cylindrical cavity 54, it is avoided that the telescopic arc-shaped member 55 is affected in its smooth telescopic movement in a humid working environment, thereby improving the working ability of the secondary cleaning device 5.

[0048] Refer to Figure 6 、 Figure 7 and Figure 8It can be seen that the three - stage cleaning device 6 includes a fifth - gear 61, an internal gear 62, an opening plate 63, a connecting column 64, a second cleaning brush 65, a second scraper 66, a telescopic rod 67, a rectangular groove 68 and a pressing plate 69. The lower end of the fixed disk 28 is installed with a fifth - gear 61 through a rotating shaft, and the lower end of the fixed disk 28 is installed with an internal gear 62 that meshes with the fifth - gear 61. The lower end of the internal gear 62 is evenly installed with opening plates 63 along its circumference. The middle position of the lower end of the opening plate 63 is installed with a connecting column 64. The outer wall of the lower end of the connecting column 64 and the outer wall and the lower end surface of the filter cartridge 43 that are opposite to each other are symmetrically installed with a second cleaning brush 65 and a second scraper 66. A telescopic rod 67 that penetrates the opening plate 63 is slidably installed inside the connecting column 64. A through - rectangular groove 68 is opened at the middle position of the connecting column 64. Symmetrically installed on the outer wall of the middle position of the telescopic rod 67 are pressing plates 69 located in the interval of the rectangular groove 68;

[0049] Refer to Figure 7 and Figure 8 It can be seen that symmetrically slidably installed in the rectangular groove 68 is a telescopic extrusion member 681 that is slidably installed in cooperation with the outer wall of the connecting column 64. The lower end of the telescopic extrusion member 681 is installed with an arc - shaped block 682. A third cleaning brush 683 is installed on the arc - shaped block 682, and the bristles of the third cleaning brush 683 are tighter than those of the second cleaning brush 65;

[0050] Refer to Figure 6 It can be seen that a limiting block 522 that cooperates with the telescopic rod 67 is installed on the outer wall of the middle position of the positioning plate 57.

[0051] During specific operation, while the fifth - gear 61 makes relative motion with the third - gear 51, it drives the internal gear 62 to rotate. At this time, while the opening plate 63 rotates following the internal gear 62, the connecting column 64 thereon drives the second scraper 66 and the second cleaning brush 65 to perform a cleaning process of scraping first and then sweeping on the inner wall of the filter cartridge 43, reducing the corrosive crystals or insoluble substances deposited on the wall of the filter cartridge 43. While improving the service life of the filter cartridge 43, it also improves the accuracy of filtering brine for lithium extraction;

[0052] At the same time, during the process of the telescopic rod 67 rotating following the opening plate 63, it continuously makes relative motion with the limiting block 522 fixed by the positioning plate 57. After that, the telescopic rod 67 drives the pressing plate 69 to exert a longitudinal force on the telescopic extrusion member 681 after being squeezed to different degrees by the limiting block 522. Then, after being stressed, the telescopic extrusion member 681 drives the arc - shaped block 682 and the third cleaning brush 683 thereon to move longitudinally in a reciprocating manner, so that the third cleaning brush 683 intermittently performs self - cleaning on the second cleaning brush 65 (during the process of the second cleaning brush 65 scraping and cleaning the wall of the filter cartridge 43 circumferentially, a large amount of crystals or insoluble substances will be deposited on its surface), ensuring the self - cleanliness of the second cleaning brush 65, and thus directly improving the cleaning force on the wall of the filter cartridge 43.

[0053] The present invention also provides an anti-corrosion process for an automatic filtering device for lithium-containing industrial brine, comprising the following steps: S1: First, an electric slider drives a sliding block 25 to move the secondary cleaning device 5 and the tertiary cleaning device 6 on the L-shaped base 26 and its lower fixed plate 28 downward to a specified processing position;

[0054] S2: Then, a driving motor 31 drives a toothed belt wheel 34 to drive a connecting rod 33 and a first cleaning brush 44 to rotate. At this time, a relative movement occurs between a first gear 48 and a second gear 49, and the nanofiltration membrane 46 rotates synchronously, and then a relative movement in the same direction occurs between the nanofiltration membrane 46 and the first cleaning brush 44, facilitating the cleaning of different positions on the surface of the nanofiltration membrane 46;

[0055] S3: Finally, a telescopic arc-shaped member 55 that rotates with a following sleeve 52 drives a conical head 56 to continuously perform a telescopic movement. During this process, the conical head 56 continuously breaks the crystals existing on the surface of the nanofiltration membrane 46. At the same time, when an internal gear 62 meshes with a fifth gear 61 and a third gear 51, the internal gear 62 drives an opening plate 63 and a second cleaning brush 65 and a second scraping plate 66 at its lower end to scrape the wall of the filter cylinder 43. And a third cleaning brush 683 synchronously performs self-cleaning on the second cleaning brush 65 and the second scraping plate 66 when a telescopic extrusion member 681 acts on an extrusion plate 69.

[0056] The circuits and controls involved in the present invention are all prior arts and will not be elaborated herein.

[0057] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An automatic filtration device for lithium-containing industrial brine, characterized in that: It includes a workbench (1), lifting devices (2) are symmetrically arranged above the workbench (1), a driving device (3) is jointly arranged between the symmetrically arranged lifting devices (2), a primary cleaning device (4) is arranged at the middle position of the lower end of the lifting device (2), a secondary cleaning device (5) is arranged on the periphery of the lower end of the lifting device (2), and a tertiary cleaning device (6) is arranged at the lower end of the lifting device (2) outside the secondary cleaning device (5); The lifting device (2) includes a support plate (21), a through groove (22), a triangular frame, a cross plate (24), a sliding block (25), an L-shaped base (26), a shaft platform (27), a fixed disk (28) and a fixed seat (29). Support plates (21) are symmetrically installed on the left and right of the upper end of the workbench (1). A through groove (22) is opened at the middle position of the support plate (21). Triangular frames (23) are installed on the upper end surfaces of the support plates (21) at both left and right ends. A cross plate (24) is jointly installed above between the triangular frames (23) at both left and right ends. A sliding block (25) is slidably installed on the inner wall of the vertical section of the triangular frame (23). An L-shaped base (26) is installed at one end of the sliding block (25) close to the middle line of the workbench (1). A shaft platform (27) is installed at the lower end of the L-shaped base (26). A fixed disk (28) is installed at the lower end of the shaft platform (27). Fixed seats (29) are symmetrically installed on the upper end surface of the cross plate (24); A connecting rod (33) passing through the shaft platform (27) and the fixed disk (28) is rotatably installed on the vertical section of the L-shaped base (26) through an ear seat, and a fixed column (36) is installed at the lower end of the connecting rod (33); The primary cleaning device (4) includes a cleaning roller (41), a fixing plate (42), a filter cartridge (43), a first cleaning brush (44), a heating ring (45), a nanofiltration membrane (46), a conduit (47), a first gear (48) and a second gear (49). A cleaning roller (41) passing through the bottom wall of the filter cartridge (43) is installed at the lower end of the fixed column (36). A fixing plate (42) is installed at a position of the workbench (1) close to the support plate (21). Filter cartridges (43) are symmetrically installed on the fixing plate (42) and located directly below the connecting rod (33). First cleaning brushes (44) with uneven heights are uniformly installed on the outer wall of the middle of the cleaning roller (41) along the circumference through columns, and the tightness of the brush hairs of the first cleaning brushes (44) increases sequentially along the circumference. A heating ring (45) is installed on the outer wall of the lower end of the cleaning roller (41). Nanofiltration membranes (46) are uniformly installed on the inner wall of the bottom of the filter cartridge (43) along the circumference. A conduit (47) connected to the nanofiltration membrane (46) and rotatably installed on the outer wall of the bottom of the filter cartridge (43) is installed at the lower end of the nanofiltration membrane (46). A first gear (48) is installed on the outer wall of the lower end of the cleaning roller (41). A second gear (49) meshing with the first gear (48) is installed on the outer wall of the conduit (47); The secondary cleaning device (5) includes a third gear (51), a sleeve (52), a fourth gear (53), a cylindrical cavity (54), a telescopic arc-shaped member (55), a conical head (56), a positioning plate (57), and an arc-shaped plate (58). A third gear (51) is installed on the outer wall of the fixed column (36). The lower end of the fixed disk (28) is evenly installed with sleeves (52) along its circumference. A fourth gear (53) meshing with the third gear (51) is installed on the outer wall of the upper end of the sleeve (52). The fourth gear (53) is always meshed with the third gear (51) during the sliding process. The inner wall of the lower end of the sleeve (52) is evenly installed with cylindrical cavities (54) along its circumference. A telescopic arc-shaped member (55) is slidably installed between the cylindrical cavity (54) and the outer wall of the lower end of the sleeve (52). A conical head (56) is evenly installed at one end of the telescopic arc-shaped member (55) close to the axis of the sleeve (52). The maximum telescopic distance of the conical head (56) just contacts the surface of the nanofiltration membrane (46). Three positioning plates (57) are evenly installed on the periphery of the lower end surface of the fixed disk (28) along its circumference. An arc-shaped plate (58) is installed at one end of the lower end of the positioning plate (57) close to the axis of the fixed disk (28). The tertiary cleaning device (6) includes a fifth gear (61), an internal gear (62), an opening plate (63), a connecting column (64), a second cleaning brush (65), a second scraper (66), a telescopic rod (67), a rectangular groove (68), and an extrusion plate (69). A fifth gear (61) is installed at the lower end of the fixed disk (28) through a rotating shaft. An internal gear (62) meshing with the fifth gear (61) is installed at the lower end of the fixed disk (28). The lower end of the internal gear (62) is evenly installed with opening plates (63) along its circumference. A connecting column (64) is installed at the middle position of the lower end of the opening plate (63). A second cleaning brush (65) and a second scraper (66) are jointly installed on one side of the outer wall of the lower end of the connecting column (64) facing the filter cartridge (43) and the lower end surface of the connecting column (64). A telescopic rod (67) passing through the opening plate (63) is slidably installed inside the connecting column (64). A through rectangular groove (68) is opened at the middle position of the connecting column (64). Extrusion plates (69) are symmetrically installed on the outer wall of the middle position of the telescopic rod (67) in the interval of the rectangular groove (68). Two telescopic extrusion members (681) slidably installed symmetrically in the rectangular groove (68) and slidably fitted with the outer wall of the connecting column (64) are provided. An arc-shaped block (682) is installed at the lower end of the telescopic extrusion member (681). A third cleaning brush (683) is installed on the arc-shaped block (682), and the bristles of the third cleaning brush (683) are tighter than those of the second cleaning brush (65). A heating ring (45) is installed on the outer wall of the lower end of the sleeve (52). A first scraper (521) is evenly installed on the lower end surface of the sleeve (52) along its circumference. A limiting block (522) cooperating with the telescopic rod (67) is installed on the outer wall of the middle position of the positioning plate (57).

2. The automatic filtering device for lithium-containing industrial brine according to claim 1, wherein: The driving device (3) includes a driving motor (31), a trapezoidal groove (32), a connecting rod (33), a toothed belt pulley (34), a toothed belt (35) and a fixing column (36). The driving motor (31) is installed at the middle position of the upper end surface of the cross plate (24). The trapezoidal grooves (32) which are symmetric left and right are formed in the cross plate (24). The connecting rod (33) also penetrates through the trapezoidal groove (32). Toothed belt pulleys (34) are installed on the outer wall of the upper end of the connecting rod (33) and the output shaft of the driving motor (31), and a toothed belt (35) is installed between the toothed belt pulleys (34).

3. The automatic filtering device for lithium-containing industrial brine according to claim 1, characterized in that: The internal hollow height of the sleeve (52) is slightly greater than the height of the nanofiltration membrane (46).

4. An automatic filtering device for lithium-containing industrial brine according to claim 1, characterized in that: The anti-corrosion process of the above-mentioned automatic filtering equipment for lithium-containing industrial brine includes the following steps: S1: First, the driving device (3) drives the lifting device (2) to move the secondary cleaning device (5) and the tertiary cleaning device (6) to the specified processing position; S2: Then, while the primary cleaning device (4) is working, it drives the secondary cleaning device (5) to perform cleaning and scraping treatment on the corresponding area; S3: Finally, the inner wall of the filter cartridge (43) is scraped and anti-corrosion treated by the tertiary cleaning device (6).

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