A pretreatment device for lithium carbonate production

Abstract

This invention relates to the field of lithium carbonate pretreatment technology, specifically to a pretreatment device for lithium carbonate production, comprising an upper filter box with a lower filter box movably connected to its bottom. A lower discharge cone is installed in the center of the lower filter box. This invention uses a rotating mechanism to drive the upper discharge cone to rotate, which in turn drives the filter bags on it to rotate, thus achieving multi-point feeding and avoiding the problem of one-sided clogging of the filter bags caused by fixed-point feeding through a fixed feeding pipe. After being filtered by the upper filter bags, the liquid flows into the discharge bend and then down through the bend. The filtrate flows down and washes the lower conical filter screen, flushing solid suspended matter to the bottom of the screen, achieving self-cleaning of the lower filter screen. When the filter bags need to be replaced, a rotating bag-squeezing mechanism pulls the clogged filter bags downwards, pulling out unused filter bags stored in the hopper mechanism, thus achieving automatic filter bag replacement.

Description

Technical Field

[0001] This invention relates to the field of lithium carbonate pretreatment technology, specifically to a pretreatment device for lithium carbonate production. Background Technology

[0002] Lithium carbonate is an inorganic compound, a colorless monoclinic crystal. It has wide applications in many fields, the most notable being in battery and energy storage technology. Battery-grade lithium carbonate is required in the manufacturing process of electric vehicles. The most common method for preparing battery-grade lithium carbonate is the brine comprehensive utilization method. This method requires pretreatment equipment for filtration to remove solid suspended matter. However, existing pretreatment equipment for lithium carbonate production has certain problems in the process:

[0003] 1. In existing lithium carbonate production pretreatment equipment, the position of the feed pipe and the filter screen are fixed during the filtration and separation process. As a result, the feed position remains unchanged during the feeding and filtration pretreatment process, and the single-point feeding method easily causes one-sided clogging of the filter screen during long-term use, thereby reducing the filtration efficiency.

[0004] 2. In the existing lithium carbonate filtration pretreatment process, in order to ensure the removal effect of solid suspended matter, a two-layer filter screen is usually used for filtration pretreatment. As a result, the first-stage filter screen is prone to accumulating more solid impurities, which can easily cause filter screen blockage and requires regular replacement. Moreover, since the first-stage filter screen is more likely to be blocked, it needs to be replaced more frequently. In existing equipment, the first-stage filter screen usually needs to be replaced manually, which is time-consuming, labor-intensive, and has low work efficiency.

[0005] 3. In existing equipment, although the secondary filter needs to filter fewer impurities, it cannot self-clean, thus still causing clogging problems. Summary of the Invention

[0006] The purpose of this invention is to provide a pretreatment apparatus for lithium carbonate production, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment device for lithium carbonate production, comprising an upper filter box, a lower filter box movably connected to the bottom of the upper filter box, a lower material leakage cone installed in the middle of the lower filter box, and a conical filter cloth covering the lower material leakage cone, a feed pipe installed at the top rear side of the upper filter box, a scraping and anti-clogging mechanism for scraping impurities and preventing clogging installed at the center of the top surface inside the upper filter box, a partition installed in the middle of the upper filter box, a rotating mechanism installed at the top of the partition, a material leakage bend installed at the bottom of the rotating mechanism, a winding mechanism provided in the middle of the material leakage bend, symmetrically provided mounting grooves on the left and right sides at the bottom of the material leakage bend, a rotating bag squeezing mechanism for squeezing and stretching filter bags installed inside the mounting grooves, and a discharge pipe installed at the center of the bottom of the lower filter box.

[0008] The rotating mechanism includes a drive assembly and a rotating assembly. The rotating assembly is installed on the top of the partition, and the drive assembly is installed on the front side of the rotating assembly. The rotating assembly includes a bearing seat, which is installed on the top of the partition. A rotating gear ring is installed on the top of the bearing seat, and an upper material leakage cone is installed on the bottom inner side of the rotating gear ring. A filter bag is covered on the upper material leakage cone.

[0009] The rotary bag squeezing mechanism includes pads, which are symmetrically installed on the top of the leakage bend. A waterproof box is provided on the top of the two pads. A power component is installed inside the waterproof box, and a squeezing and stretching component is installed at the bottom of the power component.

[0010] Preferably, a sealing ring is provided at the connection between the lower filter box and the upper filter box. The top of the upper filter box is equipped with a freely openable top cover. A first fixing ring is fixedly connected to the bottom periphery of the upper filter box. A second fixing ring is fixedly connected to the bottom periphery of the lower filter box. Two first hydraulic cylinders are symmetrically installed at the top of the second fixing ring, and the tops of the two first hydraulic cylinders are fixedly connected to the bottom of the first fixing ring. Three support legs are evenly installed at the bottom of the second fixing ring. Two fixing rods are symmetrically installed at the inside of the upper filter box, and a first pressing ring for pressing and fixing the conical filter bag is installed at the bottom of the two fixing rods.

[0011] Preferably, the drive assembly includes a mounting box, which is installed on the top front side of the upper filter box. A servo motor is installed on the bottom surface inside the mounting box. The output end of the servo motor passes through the front side of the upper filter box and is equipped with an active bevel gear. A fixing plate is installed on the top front side inside the upper filter box. A rotating shaft is rotatably connected to the center of the fixing plate. A driven bevel gear that meshes with the active bevel gear is installed on the top of the rotating shaft, and an active spur gear that meshes with a rotating gear ring is installed on the bottom of the rotating shaft.

[0012] Preferably, the power assembly includes a first drive motor, which is installed at the center of the top surface inside the waterproof box. From top to bottom, a first transmission gear and a drive pulley are installed on the output end of the first drive motor. An installation plate is installed on the left side inside the waterproof box. The bottom of the installation plate is rotatably connected to a second transmission gear and a third transmission gear via a rotating shaft. The second transmission gear meshes with the first transmission gear and also meshes with the third transmission gear. Two transmission rods are symmetrically and movably connected to the bottom of the waterproof box. The transmission rods are rotatably connected to the waterproof box. A fourth transmission gear, which meshes with the third transmission gear, is installed on the top of the transmission rod on the left side. A driven pulley is installed on the top of the transmission rod on the right side. The driven pulley and the drive pulley are driven by a toothed belt. A compression and stretching assembly is installed at the bottom of the transmission rod.

[0013] Preferably, the extrusion and stretching assembly includes a rotating block, which is fixedly sleeved on the bottom of the transmission rod. Two mounting ears are symmetrically installed on the transmission rod, and the mounting ears are installed inside the mounting groove. The rotating block is positioned between the two mounting ears. Four fixing blocks are evenly installed on the outer circumference of the rotating block. Several extrusion teeth are installed on the side of the four fixing blocks away from the rotating block, and the length of the extrusion teeth on the four fixing blocks increases sequentially.

[0014] Preferably, the winding mechanism includes two fixed arms, which are symmetrically installed in the middle of the material leakage bend. A second drive motor is installed at the bottom of the left fixed arm, and a fixed shaft is fixedly connected to the output end of the second drive motor. The end of the fixed shaft away from the second drive motor is rotatably connected to the right fixed arm. A winding disc for winding the filter bag is sleeved in the center of the fixed shaft, and a bag clamping plate is installed on the top of the winding disc. The inside of the material leakage bend is connected to the upper material leakage cone.

[0015] Preferably, the top of the rotating toothed ring is equipped with a hopper mechanism for storing filter bags. The hopper mechanism includes a hopper body, which is fixedly installed on the top of the rotating toothed ring. An annular outlet is opened at the bottom of the inner circumference of the hopper body. Several No. 3 springs are installed inside the hopper body at the top of the annular outlet. An arc-shaped pressing plate for pressing and fixing the filter bags is installed at one end of each No. 3 spring.

[0016] Preferably, the scraping anti-clogging mechanism includes a lifting component and a telescopic scraping component. The telescopic scraping component is installed at the bottom of the lifting component. The lifting component includes a second hydraulic cylinder. The fixed end of the second hydraulic cylinder is installed at the center of the top surface inside the upper filter box. A connecting plate is installed at the bottom of the output end of the second hydraulic cylinder. A third fixing ring is installed at the bottom of the connecting plate. Several telescopic scraping components are evenly installed at the bottom of the third fixing ring. A pressing component is installed at the center of the bottom of the connecting plate.

[0017] Preferably, the telescopic scraping assembly includes a first telescopic rod, which is evenly installed at the bottom of the third fixed ring. An installation block is installed at the bottom of both the fixed end and the movable end of the first telescopic rod, and a first spring is installed between the two installation blocks. A connecting block is installed at the bottom of the output end of the first telescopic rod, and a telescopic head is installed at the bottom of the connecting block. A rubber scraper is installed on the side of the telescopic head away from the first spring, and a serrated groove is formed on the side of the rubber scraper close to the first spring.

[0018] Preferably, the pressing assembly includes a second telescopic rod, the fixed end of which is installed at the bottom center of the connecting plate, a fixing strip is installed at the bottom of the output end of the second telescopic rod, a second pressing ring is installed at the bottom of the fixing strip, and a second spring is sleeved around the second telescopic rod, with the second spring installed between the connecting plate and the fixing strip.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention replaces traditional filter screens with filter bags for filtration. The filter bags are installed on an upper discharge cone. During filtration using a feed pipe fixed to the upper filter housing, a rotating mechanism drives the upper discharge cone to rotate, which in turn rotates the filter bags on it. This achieves circumferential filtration of the filter bags, avoiding the single-point clogging problem caused by fixed-position filtration. Furthermore, the invention incorporates a scraping anti-clogging mechanism. As the scraping mechanism moves downwards, the rubber scraper adaptively contracts and scrapes material from top to bottom, preventing clogging and cleaning of the upper filter bags. This effectively reduces the probability of clogging and thus the frequency of filter bag replacement. Simultaneously, a hopper mechanism stores the filter bags. When a filter bag needs replacement, a rotating squeezing mechanism rotates and stretches it, pulling the clogged filter bag downwards and removing the unused filter bags stored in the hopper. This achieves automatic filter bag replacement, eliminating the need for frequent manual replacement, increasing work efficiency, and reducing labor costs.

[0021] 2. In this invention, the liquid flows into the leakage bend after being filtered by the upper filter bag, and then flows down from the leakage bend. After the filtrate flows down, it washes the lower conical filter screen, flushing the solid suspended matter to the bottom of the filter screen, thereby achieving self-cleaning of the lower filter screen, extending the service life of the lower filter screen, and reducing the replacement frequency of the lower filter screen. Attached Figure Description

[0022] Figure 1 This is a three-dimensional view of the overall structure of the present invention.

[0023] Figure 2 This is a three-dimensional sectional view of the overall structure of the present invention.

[0024] Figure 3 This is a partial three-dimensional cross-sectional view of the rotating mechanism and the material-leaking bend of the present invention.

[0025] Figure 4 This is a perspective view of the scraping and anti-clogging mechanism of the present invention.

[0026] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of region A in the middle.

[0027] Figure 6 This is a partial sectional perspective view of the rotary extrusion bag mechanism and the winding mechanism of the present invention.

[0028] Figure 7 This is a partial cross-sectional front view of the rotary extrusion bag mechanism and winding mechanism of the present invention.

[0029] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of region B in the middle.

[0030] Figure 9 For the present invention Figure 7 Enlarged schematic diagram of region C in the middle.

[0031] Figure 10 This is a front sectional view of the hopper mechanism of the present invention.

[0032] In the diagram: 1. Upper filter housing; 2. Feed pipe; 3. Lower filter housing; 4. Discharge pipe; 5. Rotating mechanism; 51. Drive assembly; 511. Servo motor; 512. Mounting box; 513. Driving bevel gear; 514. Driven bevel gear; 515. Rotating shaft; 516. Driving spur gear; 517. Fixing plate; 52. Rotating assembly; 521. Rotating gear ring; 522. Bearing seat; 523. Upper material leakage cone; 6. Scraping anti-clogging mechanism; 61. Lifting assembly; 611, Hydraulic cylinder No. 2; 612, Connecting plate; 613, Fixing ring No. 3; 62, Telescopic scraper assembly; 621, Rubber scraper blade; 622, Telescopic rod No. 1; 623, Connecting block; 624, Telescopic head; 625, Spring No. 1; 626, Mounting block; 627, Serrated groove; 63, Pressing assembly; 631, Telescopic rod No. 2; 632, Spring No. 2; 633, Pressing ring No. 2; 634, Fixing strip; 7, Hopper mechanism; 71 72. Circular outlet; 73. Hopper body; 74. Spring No. 3; 8. Arc-shaped pressure plate; 9. Rotary bag squeezing mechanism; 10. Power assembly; 11. Driven pulley; 12. Drive motor No. 1; 13. Transmission gear No. 1; 14. Toothed belt; 15. Drive pulley; 16. Transmission gear No. 2; 17. Transmission gear No. 3; 18. Transmission gear No. 4; 19. Mounting plate; 10. Extrusion and stretching assembly; 11. Rotating block; 12. 823. Fixing block; 824. Extrusion teeth; 825. Mounting ear plate; 83. Waterproof box; 84. Pad block; 85. Transmission rod; 9. Winding mechanism; 91. Fixing arm; 92. Second drive motor; 93. Winding reel; 94. Bag clamping plate; 95. Fixing shaft; 10. Partition plate; 11. First fixing ring; 12. Fixing rod; 13. Lower material leakage cone; 14. First pressing ring; 15. Second fixing ring; 16. First hydraulic cylinder; 17. Material leakage bend; 18. Mounting groove. Detailed Implementation

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Please see Figure 1 and Figure 2A pretreatment device for lithium carbonate production includes an upper filter box 1, a lower filter box 3 movably connected to the bottom of the upper filter box 1, a lower material leakage cone 13 installed in the center of the lower filter box 3, and a conical filter cloth covering the lower material leakage cone 13; a feed pipe 2 installed at the top rear side of the upper filter box 1; a scraping and anti-clogging mechanism 6 for scraping impurities and preventing clogging installed at the center of the top surface inside the upper filter box 1; a partition 10 installed in the center of the upper filter box 1, a rotating mechanism 5 installed at the top of the partition 10, and a material leakage bend 17 installed at the bottom of the rotating mechanism 5. A winding mechanism 9 is provided in the middle of the material leakage bend 17. The bottom of the material leakage bend 17 is symmetrically provided with mounting grooves 18, and a rotating bag squeezing mechanism 8 for squeezing and stretching filter bags is installed inside the mounting grooves 18. A discharge pipe 4 is installed at the center of the bottom of the lower filter box 3. In the process of use, the material is first fed through the feed pipe 2, and the upper filter box 1 performs one filtration. The scraping and anti-clogging mechanism 6 is used to scrape and prevent clogging of the upper conical filter cloth. The rotating mechanism 5 realizes the circumferential rotation filtration of the upper conical filter cloth. The rotating bag squeezing mechanism 8 is used to squeeze and pull the filter bag downwards, realizing the automatic replacement of the filter bag.

[0035] Please see Figure 2 and Figure 3 The rotating mechanism 5 includes a drive assembly 51 and a rotating assembly 52. ​​The rotating assembly 52 is mounted on the top of the partition 10, and the drive assembly 51 is mounted on the front side of the rotating assembly 52. ​​The rotating assembly 52 includes a bearing seat 522, which is mounted on the top of the partition 10. A rotating gear ring 521 is mounted on the top of the bearing seat 522, and an upper discharge cone 523 is mounted on the bottom inner side of the rotating gear ring 521. A filter bag is covered on the upper discharge cone 523. The drive assembly 51 includes a mounting box 512, which is mounted on the upper... A servo motor 511 is installed on the top front side of the upper filter box 1 and on the bottom inside the mounting box 512. The output end of the servo motor 511 passes through the front side of the upper filter box 1 and is equipped with an active bevel gear 513. A fixing plate 517 is installed on the top front side inside the upper filter box 1. A rotating shaft 515 is rotatably connected to the center of the fixing plate 517. A driven bevel gear 514 that meshes with the active bevel gear 513 is installed on the top of the rotating shaft 515, and an active spur gear 516 that meshes with the rotating gear ring 521 is installed on the bottom of the rotating shaft 515.

[0036] When the rotating mechanism 5 is in use, the servo motor 511 is started first. The output end of the servo motor 511 starts to rotate, which in turn drives the active bevel gear 513 to rotate, then drives the driven bevel gear 514 to rotate, then drives the rotating shaft 515 to rotate, then drives the active spur gear 516 to rotate, then drives the rotating gear ring 521 to rotate, then drives the upper material leakage cone 523 to rotate, and then drives the filter bag on the upper material leakage cone 523 to rotate. Thus, when the material is fed into the feed pipe 2 for pretreatment, the material falls at different points, realizing multi-point uniform filtration and avoiding the problem of single-point feeding filtration causing unilateral blockage of the filter bag.

[0037] Please see Figure 2 and Figure 10 The top of the rotating gear ring 521 is equipped with a hopper mechanism 7 for storing filter bags. The hopper mechanism 7 includes a hopper body 72, which is fixedly installed on the top of the rotating gear ring 521. An annular outlet 71 is opened at the bottom of the inner circumference of the hopper body 72. Several No. 3 springs 73 are installed inside the hopper body 72 at the top of the annular outlet 71. An arc-shaped pressing plate 74 for pressing and fixing the filter bags is installed at one end of the No. 3 spring 73.

[0038] The hopper body 72 in the hopper mechanism 7 stores filter bags for filtration. The bottom of the filter bag extends from the bottom of the annular outlet 71 and is then covered and fitted into the upper discharge cone 523. Subsequently, the filter bag extends from the bottom of the discharge bend 17 and passes through the rotating extrusion mechanism 8. Then, the bottom of the filter bag is fixed to the winding mechanism 9, thus closing the bottom of the filter bag. The elastic force of the third spring 73 presses the arc-shaped pressure plate 74, which presses the filter bag tightly against the inner side wall of the hopper body 72. This helps to apply pressure to the filter bag and avoids the problem of the filter bag extending too much when the rotating extrusion mechanism 8 pushes and pulls the filter bag downward.

[0039] Please see Figure 2 A sealing ring is provided at the connection between the lower filter box 3 and the upper filter box 1. A first fixing ring 11 is fixedly connected to the bottom periphery of the upper filter box 1. A second fixing ring 15 is fixedly connected to the bottom periphery of the lower filter box 3. Two first hydraulic cylinders 16 are symmetrically installed at the top of the second fixing ring 15, and the tops of the two first hydraulic cylinders 16 are fixedly connected to the bottom of the first fixing ring 11. Three support legs are evenly installed at the bottom of the second fixing ring 15. Two fixing rods 12 are symmetrically installed at the inside of the upper filter box 1. A first pressing ring 14 for pressing and fixing the conical filter bag is installed at the bottom of the two fixing rods 12.

[0040] After filtration by the upper filter bag, some of the filtrate leaks down through the holes in the upper discharge cone 523. The leaked filtrate undergoes secondary filtration through the conical filter cloth covering the lower discharge cone 13, achieving secondary filtration of the filtrate. The filtered filtrate exits from the discharge pipe 4, while some of the filtrate, after filtration by the filter bag, flows out from the bottom of the discharge bend 17. As the rotating mechanism 5 rotates, it drives the discharge bend 17 to rotate synchronously. The outflowing filtrate rotates and washes the conical filter cloth on the lower discharge cone 13, flushing the solid suspended matter on the conical filter cloth to the bottom of the lower filter box 3. This achieves self-cleaning of the conical filter cloth on the lower discharge cone 13, reducing the problem of clogging of the lower conical filter cloth. At the same time, the fixing rod 12 and the first pressing ring 14 are used to tightly press and fix the conical filter cloth to the lower discharge cone 13. To avoid the problem of the conical filter cloth detaching from the lower leakage cone 13 during the flushing process, when the conical filter cloth needs to be replaced, the output end of the first hydraulic cylinder 16 extends, driving the first fixing ring 11 to rise, which in turn drives the upper filter box 1 to rise, loosening the insertion and fixing between the upper filter box 1 and the lower filter box 3. At this time, as the upper filter box 1 rises, the fixing rod 12 rises, which in turn drives the first pressing ring 14 to rise, loosening the pressing and fixing of the conical filter cloth. At this time, the conical filter cloth to be replaced is removed, and the solid suspended matter flushed to the bottom of the lower filter box 3 is removed. A new conical filter cloth is then installed, and then the output end of the first hydraulic cylinder 16 moves down, indirectly driving the first pressing ring 14 to move down, using the first pressing ring 14 to press and fix the new conical filter cloth onto the lower leakage cone 13.

[0041] Please see Figure 2 and Figure 4 The scraping anti-clogging mechanism 6 includes a lifting component 61 and a telescopic scraping component 62. The telescopic scraping component 62 is installed at the bottom of the lifting component 61. The lifting component 61 includes a second hydraulic cylinder 611. The fixed end of the second hydraulic cylinder 611 is installed at the center of the top surface inside the upper filter box 1. A connecting plate 612 is installed at the bottom of the output end of the second hydraulic cylinder 611. A third fixing ring 613 is installed at the bottom of the connecting plate 612, and several telescopic scraping components 62 are evenly installed at the bottom of the third fixing ring 613. A pressing component 63 is installed at the center of the bottom of the connecting plate 612.

[0042] Please see Figure 4 and Figure 5The telescopic scraper assembly 62 includes a first telescopic rod 622, which is evenly installed at the bottom of the third fixing ring 613. The bottom of both the fixed end and the movable end of the first telescopic rod 622 is equipped with mounting blocks 626, and a first spring 625 is installed between the two mounting blocks 626. A connecting block 623 is installed at the bottom of the output end of the first telescopic rod 622, and a telescopic head 624 is installed at the bottom of the connecting block 623. A rubber scraper 621 is installed on the side of the telescopic head 624 away from the first spring 625, and a serrated groove 627 is opened on the side of the rubber scraper 621 close to the first spring 625.

[0043] Please see Figure 4 The pressing assembly 63 includes a second telescopic rod 631. The fixed end of the second telescopic rod 631 is installed at the bottom center of the connecting plate 612. A fixing strip 634 is installed at the bottom of the output end of the second telescopic rod 631. A second pressing ring 633 is installed at the bottom of the fixing strip 634. A second spring 632 is sleeved around the second telescopic rod 631 and is installed between the connecting plate 612 and the fixing strip 634.

[0044] During operation, when the upper filter bag becomes clogged, the output end of the second hydraulic cylinder 611 descends, causing the connecting plate 612 to descend, which in turn causes the third fixing ring 613 to descend, followed by the second telescopic rod 631, then the fixing strip 634, and finally the second pressing ring 633. At this point, the second pressing ring 633 presses against the bottom of the upper leakage cone 523, tightly securing the filter bag to the upper leakage cone 523. As the output end of hydraulic cylinder 611 continues to descend, it drives telescopic rod 622 to descend, which in turn drives connecting block 623 to descend, indirectly driving rubber scraper 621 to descend. Rubber scraper 621 comes into contact with the filter bag. As it continues to press down, telescopic rod 622 and spring 625 retract, realizing the adaptive retraction and downward scraping of rubber scraper 621, which scrapes away solid suspended matter on the filter bag downward, which helps to clear the filter bag and reduces the probability of blockage of the upper filter bag.

[0045] Please see Figure 2 , Figure 7 and Figure 9 The rotary bag squeezing mechanism 8 includes pads 84, which are symmetrically installed on the top of the output end of the material leakage bend 17. A waterproof box 83 is provided on the top of the two pads 84. A power assembly 81 is installed inside the waterproof box 83, and a squeezing and stretching assembly 82 is installed at the bottom of the power assembly 81.

[0046] Please see Figure 6 , Figure 7 and Figure 8The power assembly 81 includes a first drive motor 812, which is installed at the center of the top surface inside the waterproof box 83. From top to bottom, a first transmission gear 813 and a drive pulley 815 are sequentially installed at the output end of the first drive motor 812. An installation plate 819 is installed on the left side inside the waterproof box 83. A second transmission gear 816 and a third transmission gear 817 are sequentially rotatably connected to the bottom of the installation plate 819 via a rotating shaft. The second transmission gear 816 meshes with the first transmission gear 813, and the second transmission gear... Gear 816 meshes with transmission gear 817. Two transmission rods 85 are symmetrically and movably connected to the bottom of waterproof box 83. The transmission rods 85 are rotatably connected to waterproof box 83. The transmission gear 818, which meshes with transmission gear 817, is installed on the top of transmission rod 85 on the left side. The driven pulley 811 is installed on the top of transmission rod 85 on the right side. The driven pulley 811 and the driving pulley 815 are driven by a toothed belt 814. The extrusion and tension assembly 82 is installed at the bottom of transmission rod 85.

[0047] Please see Figure 6 and Figure 9 The extrusion stretching assembly 82 includes a rotating block 821, which is fixedly sleeved on the bottom of the transmission rod 85. The transmission rod 85 has two mounting ears 824 symmetrically installed on its upper and lower sides. The mounting ears 824 are installed inside the mounting groove 18, and the rotating block 821 is positioned between the two mounting ears 824. Four fixing blocks 822 are evenly installed on the outer circumference of the rotating block 821. Several extrusion teeth 823 are installed on the side of each of the four fixing blocks 822 away from the rotating block 821, and the length of the extrusion teeth 823 on the four fixing blocks 822 increases sequentially.

[0048] During operation, if the upper filter bag fails to clear the blockage effectively after being scraped by the anti-blocking scraping mechanism 6, the first drive motor 812 in the rotary bag squeezing mechanism 8 is activated. The output of the first drive motor 812 rotates, simultaneously driving the first transmission gear 813 and the drive pulley 815 to rotate. The rotation of the first transmission gear 813 drives the second transmission gear 816 to rotate, indirectly driving the fourth transmission gear 818 to rotate, which in turn drives the transmission rod 85 on the left side to rotate. Simultaneously, the rotation of the drive pulley 815 drives the toothed belt 814 to rotate, which in turn drives the driven pulley 811 to rotate, subsequently driving the transmission rod 85 on the right side to rotate. The rotation directions of the two transmission rods 85 are opposite, thus driving the rotation of the two sides... The moving block 821 rotates synchronously, which in turn drives the fixed block 822 and the squeezing teeth 823 to rotate. The rotation of the squeezing teeth 823 pulls the filter bag downward, thereby pulling the clogged filter bag from the upper leakage cone 523 into the leakage bend 17. The unused filter bags stored in the hopper body 72 are then placed on the upper leakage cone 523, realizing automatic replacement of the filter bag without manual replacement, which is highly efficient. In addition, the squeezing teeth 823 on the four fixed blocks 822 on the outer circumference of the rotating block 821 are of different lengths. This results in the filter bag having different openings at the bottom of the leakage bend 17 during the downward stretching process. The squeezing teeth 823 of different lengths facilitate the squeezing of the filtrate in the filter bag during the squeezing process, reducing the residue of filtrate in the filter bag.

[0049] Please see Figure 2 , Figure 5 and Figure 6 The winding mechanism 9 includes two fixed arms 91, which are symmetrically installed in the middle of the material leakage bend 17. A second drive motor 92 is installed at the bottom of the fixed arm 91 on the left side. A fixed shaft 95 is fixedly connected to the output end of the second drive motor 92. The end of the fixed shaft 95 away from the second drive motor 92 is rotatably connected to the fixed arm 91 on the right side. A winding disc 93 for winding the filter bag is sleeved in the center of the fixed shaft 95, and a bag clamping plate 94 is installed on the top of the winding disc 93. The inside of the material leakage bend 17 is connected to the upper material leakage cone 523.

[0050] During use, while the rotating bag squeezing mechanism 8 is squeezing and stretching the filter bag downwards, the output end of the second drive motor 92 rotates, which in turn drives the fixed shaft 95 to rotate, and then drives the winding disc 93 to rotate and wind the filter bag. The winding disc 93 is used to wind the filter bag that has been squeezed and replaced. While winding, the filter bag is squeezed, which helps to squeeze out the residual filtrate in the filter bag and improve the filtrate yield. At the same time, when the filter bag is finished winding, the output end of the first hydraulic cylinder 16 extends out, loosens the plug-in fixing between the upper filter box 1 and the lower filter box 3, and then removes the filter bag wound on the winding disc 93.

[0051] Working Principle: In use, the top cover of the upper filter box 1 is first opened. Then, a new filter bag stored in the hopper body 72 is placed over the upper discharge cone 523, passes through the discharge bend 17 and the rotating bag squeezing mechanism 8, and is fixed to the winding mechanism 9. At this time, material is added using the feed pipe 2. Simultaneously, the rotating mechanism 5 drives the upper discharge cone 523 to rotate, which in turn drives the filter bag to rotate, thus achieving multi-point filtration and avoiding the problem of one-sided clogging caused by one-sided filtration on the filter bag. Most of the filtrate after initial filtration through the filter bag leaks through the holes in the upper discharge cone 523, flowing to the conical filter cloth on the lower discharge cone 13 for secondary filtration, improving the filtration effect. Some of the filtrate, after filtration through the upper filter bag, flows into the discharge bend 17 and flows out from the bottom of the discharge bend 17, rotating and rinsing the conical filter cloth on the lower discharge cone 13, achieving self-cleaning of the conical filter cloth and reducing the risk of clogging. The probability of filter bag clogging is reduced. After filtration through the lower conical filter cloth, the filtrate exits from the discharge pipe 4. When the filter bag on the upper layer of the upper discharge cone 523 needs to be cleaned, the scraping and anti-clogging mechanism 6 moves downward to scrape the filter bag adaptively, which helps to clear the filter bag. Combined with the rotary feeding method, the probability of upper filter bag clogging is further reduced. When the upper filter bag cannot be cleared and needs to be replaced, the rotary squeezing mechanism 8 rotates and squeezes downward to cover the unused filter bag on the upper discharge cone 523, realizing automatic replacement of filter bags without frequent manual replacement, which is highly efficient. When the rotary squeezing mechanism 8 squeezes and stretches downward, the winding mechanism 9 winds up the filter bag. During the winding process, the filtrate in the filter bag is squeezed, which improves the yield of filtrate. The No. 3 spring 73 and the arc-shaped pressure plate 74 in the hopper mechanism 7 press the filter bag tightly, avoiding the problem of excessive filter bag being pulled out when the rotary squeezing mechanism 8 rotates and stretches downward.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pretreatment device for lithium carbonate production, comprising an upper filter box (1), characterized in that: The lower filter box (3) is movably connected to the bottom of the upper filter box (1). A lower material leakage cone (13) is installed in the middle of the lower filter box (3), and a cone-shaped filter cloth is covered on the lower material leakage cone (13). A feed pipe (2) is installed on the top rear side of the upper filter box (1). A scraping and anti-clogging mechanism (6) for scraping impurities and preventing clogging is installed in the center of the top surface inside the upper filter box (1). A feed pipe (2) is installed in the middle of the upper filter box (1). There is a partition (10), and a rotating mechanism (5) is installed on the top of the partition (10). A material leakage bend (17) is installed at the bottom of the rotating mechanism (5). A winding mechanism (9) is provided in the middle of the material leakage bend (17). An installation groove (18) is symmetrically opened on the left and right sides at the bottom of the material leakage bend (17). A rotating bag squeezing mechanism (8) for squeezing and stretching filter bags is installed inside the installation groove (18). A discharge pipe (4) is installed at the center of the bottom of the lower filter box (3). The rotating mechanism (5) includes a drive assembly (51) and a rotating assembly (52). The rotating assembly (52) is mounted on the top of the partition (10), and the drive assembly (51) is mounted on the front side of the rotating assembly (52). The rotating assembly (52) includes a bearing seat (522), which is mounted on the top of the partition (10). A rotating gear ring (521) is mounted on the top of the bearing seat (522), and an upper material leakage cone (523) is mounted on the bottom inner side of the rotating gear ring (521). A filter bag is covered on the upper material leakage cone (523). The rotary bag squeezing mechanism (8) includes pads (84), which are symmetrically installed on the top of the material leakage bend (17). A waterproof box (83) is provided on the top of the two pads (84). A power assembly (81) is installed inside the waterproof box (83), and a squeezing and stretching assembly (82) is installed at the bottom of the power assembly (81).

2. The pretreatment equipment for lithium carbonate production according to claim 1, characterized in that: A sealing ring is provided at the connection between the lower filter box (3) and the upper filter box (1). The upper filter box (1) is equipped with a top cover that can be opened freely. A first fixing ring (11) is fixedly connected to the bottom periphery of the upper filter box (1). A second fixing ring (15) is fixedly connected to the bottom periphery of the lower filter box (3). Two first hydraulic cylinders (16) are symmetrically installed on the top of the second fixing ring (15), and the tops of the two first hydraulic cylinders (16) are fixedly connected to the bottom of the first fixing ring (11). Three support legs are evenly installed on the bottom of the second fixing ring (15). Two fixing rods (12) are symmetrically installed inside the upper filter box (1). A first pressing ring (14) for pressing and fixing the conical filter bag is installed on the bottom of the two fixing rods (12).

3. The pretreatment equipment for lithium carbonate production according to claim 1, characterized in that: The drive assembly (51) includes a mounting box (512), which is mounted on the top front side of the upper filter box (1). A servo motor (511) is mounted on the bottom surface inside the mounting box (512). The output end of the servo motor (511) passes through the front side of the upper filter box (1) and is mounted with an active bevel gear (513). A fixing plate (517) is mounted on the top front side inside the upper filter box (1). A rotating shaft (515) is rotatably connected to the center of the fixing plate (517). A driven bevel gear (514) that meshes with the active bevel gear (513) is mounted on the top of the rotating shaft (515), and an active spur gear (516) that meshes with the rotating gear ring (521) is mounted on the bottom of the rotating shaft (515).

4. The pretreatment equipment for lithium carbonate production according to claim 1, characterized in that: The power assembly (81) includes a first drive motor (812), which is installed at the center of the top surface inside the waterproof box (83). From top to bottom, the output end of the first drive motor (812) is sequentially equipped with a first transmission gear (813) and a drive pulley (815). An installation plate (819) is installed on the left side inside the waterproof box (83). The bottom of the installation plate (819) is rotatably connected to a second transmission gear (816) and a third transmission gear (817) via a rotating shaft. The second transmission gear (816) meshes with the first transmission gear (813), and the second transmission gear… The wheel (816) meshes with the third transmission gear (817). Two transmission rods (85) are symmetrically connected to the bottom of the waterproof box (83). The transmission rods (85) are rotatably connected to the waterproof box (83). The top of the transmission rod (85) on the left is equipped with the fourth transmission gear (818) that meshes with the third transmission gear (817). The top of the transmission rod (85) on the right is equipped with the driven pulley (811). The driven pulley (811) and the driving pulley (815) are driven by a toothed belt (814). The bottom of the transmission rod (85) is equipped with a compression and stretching assembly (82).

5. A pretreatment device for lithium carbonate production according to claim 4, characterized in that: The extrusion stretching assembly (82) includes a rotating block (821), which is fixedly sleeved on the bottom of the transmission rod (85). The transmission rod (85) has two mounting ears (824) symmetrically installed on its upper and lower sides. The mounting ears (824) are installed inside the mounting groove (18), and the rotating block (821) is positioned between the two mounting ears (824). Four fixing blocks (822) are evenly installed on the outer circumference of the rotating block (821). Several extrusion teeth (823) are installed on the side of the four fixing blocks (822) away from the rotating block (821), and the length of the extrusion teeth (823) on the four fixing blocks (822) increases sequentially.

6. A pretreatment device for lithium carbonate production according to claim 1, characterized in that: The winding mechanism (9) includes two fixed arms (91). The two fixed arms (91) are symmetrically installed in the middle of the material leakage bend (17). A second drive motor (92) is installed at the bottom of the fixed arm (91) on the left side. A fixed shaft (95) is fixedly connected to the output end of the second drive motor (92). The end of the fixed shaft (95) away from the second drive motor (92) is rotatably connected to the fixed arm (91) on the right side. A winding disc (93) for winding the filter bag is sleeved in the center of the fixed shaft (95). A bag clamping plate (94) is installed on the top of the winding disc (93). The inside of the material leakage bend (17) is connected to the upper material leakage cone (523).

7. A pretreatment device for lithium carbonate production according to claim 1, characterized in that: The rotating toothed ring (521) is equipped with a hopper mechanism (7) for storing filter bags. The hopper mechanism (7) includes a hopper body (72), which is fixedly installed on the top of the rotating toothed ring (521). An annular outlet (71) is opened at the bottom of the inner circumference of the hopper body (72). Several No. 3 springs (73) are installed inside the hopper body (72) at the top of the annular outlet (71). An arc-shaped pressing plate (74) for pressing and fixing the filter bags is installed at one end of the No. 3 springs (73).

8. A pretreatment device for lithium carbonate production according to claim 1, characterized in that: The scraping anti-clogging mechanism (6) includes a lifting assembly (61) and a telescopic scraping assembly (62). The telescopic scraping assembly (62) is installed at the bottom of the lifting assembly (61). The lifting assembly (61) includes a second hydraulic cylinder (611). The fixed end of the second hydraulic cylinder (611) is installed at the center of the top surface inside the upper filter box (1). A connecting plate (612) is installed at the bottom of the output end of the second hydraulic cylinder (611). A third fixing ring (613) is installed at the bottom of the connecting plate (612). Several telescopic scraping assemblies (62) are evenly installed at the bottom of the third fixing ring (613). A pressing assembly (63) is installed at the center of the bottom of the connecting plate (612).

9. A pretreatment device for lithium carbonate production according to claim 8, characterized in that: The telescopic scraper assembly (62) includes a first telescopic rod (622), which is evenly installed at the bottom of the third fixing ring (613). The bottom of the fixed end and the movable end of the first telescopic rod (622) are both equipped with mounting blocks (626), and a first spring (625) is installed between the two mounting blocks (626). A connecting block (623) is installed at the bottom of the output end of the first telescopic rod (622), and a telescopic head (624) is installed at the bottom of the connecting block (623). A rubber scraper plate (621) is installed on the side of the telescopic head (624) away from the first spring (625), and a serrated groove (627) is opened on the side of the rubber scraper plate (621) close to the first spring (625).

10. A pretreatment device for lithium carbonate production according to claim 8, characterized in that: The pressing assembly (63) includes a second telescopic rod (631), the fixed end of the second telescopic rod (631) is installed at the bottom center of the connecting plate (612), a fixing strip (634) is installed at the bottom of the output end of the second telescopic rod (631), a second crimping ring (633) is installed at the bottom of the fixing strip (634), and a second spring (632) is sleeved around the second telescopic rod (631), and the second spring (632) is installed between the connecting plate (612) and the fixing strip (634).

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