A filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing filter membranes

Abstract

The present invention provides a filtering device for extracting lithium from salt lake brine by membrane method, which relates to the technical field of extracting lithium from salt lake brine, and includes a tripod, a filtering chamber, a support, a water outlet end, a coarse filtering chamber and a rear cover. In the present invention, when it is found during the installation process that there is a deviation between the filter membrane mechanism and the inner wall of the filtering chamber, the servo motor is started. The servo motor transmits power to the turbine box, and the turbine box drives the transmission rod to rotate inside the connecting block. The transmission rod drives the driving bevel gear to rotate, and the engaged driven bevel gear obtains power. Since the driven bevel gear is fixed to a movable frame, the two movable frames and the long rod rotate, thereby adjusting the angle of the membrane stack, so that the lower end of the membrane stack can be clamped into the inside of the filtering chamber, enabling the entire filter membrane mechanism to be smoothly installed into the inside of the filtering chamber, effectively alleviating the error during the movement and replacement process, and further improving the accuracy during replacement and installation, making the operation more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of extracting lithium from salt lake brine, and particularly relates to a filtering device for extracting lithium from salt lake brine by a membrane method, which is convenient for automatically replacing a filter membrane. Background Art

[0002] Lithium, as a strategic resource, is widely used in the military, civilian, aerospace and aviation fields and is known as the "metal that drives the world forward". Therefore, the research on lithium and its compounds has always been highly valued by countries around the world. With the rapid development of the new energy industry, the demand for lithium has been increasing year by year, and the extraction and separation technology of lithium has also received more and more attention. China is rich in salt lake lithium resources, but due to the high magnesium-lithium ratio and the difficulty of separation, the most commonly used method at present is the membrane separation method. This technology uses a thin film with selective permeability to separate, purify and concentrate binary or multicomponent solutes and solvents under the action of external force.

[0003] In the prior art, for example, Chinese Patent Application CN211545968U discloses a device for extracting lithium carbonate from salt lake brine, which includes an evaporation and crystallization tank. A heating device is fixedly installed at the bottom end of the evaporation and crystallization tank. The output end of the evaporation and crystallization tank is fixedly installed with a discharge pipe. The output end of the discharge pipe is fixedly connected with a filtering pipe. The output end of the filtering pipe is fixedly connected with a conduit. A filter screen is arranged in the filtering pipe. Both ends of the filter screen are respectively fixedly connected with an L-shaped connecting rod. The two L-shaped connecting rods respectively pass through the filtering pipe and are fixedly connected with one end of a spring. This device can accelerate the crystallization of lithium carbonate by directly acting on the closed evaporation and crystallization tank through the heating device.

[0004] However, in the prior art, when replacing the old and new filter membranes, a power part drives the new filter membrane to replace the old filter membrane. However, in actual operation, due to errors that occur during the process of power traction and movement, the movement error will cause the new filter membrane to deviate from its position, resulting in the new filter membrane being unable to be correctly introduced into the expected position during the movement. It is necessary to manually calibrate the angular deviation of the new filter membrane before the new filter membrane can be installed in the predetermined position. This increases additional operations and the inconvenience during automatic membrane replacement. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that when replacing the old and new filter membranes, a power part drives the new filter membrane to replace the old filter membrane. However, in actual operation, due to errors that occur during the process of power traction and movement, the movement error will cause the new filter membrane to deviate from its position, resulting in the new filter membrane being unable to be correctly introduced into the expected position during the movement. It is necessary to manually calibrate the angular deviation of the new filter membrane before the new filter membrane can be installed in the predetermined position. This increases additional operations and the inconvenience during automatic membrane replacement.

[0006] To achieve the above object, the present invention adopts the following technical solution: A filtering device for facilitating automatic replacement of filter membranes in membrane method for extracting lithium from salt lake brine, comprising a tripod, a filtering chamber, a support, a water outlet end, a coarse filtering chamber and a rear cover. The upper side of the tripod is fixedly connected to the lower side of the filtering chamber. A support is fixedly connected to the upper side of the tripod and located outside the filtering chamber. A filter membrane mechanism is movably clamped inside the filtering chamber. A lifting mechanism is fixedly connected to the upper side of the tripod. A sliding mechanism is fixedly connected inside the lifting mechanism. The inner sides of the sliding mechanism are movably clamped to both ends of the filter membrane mechanism. A position calibration mechanism is fixedly connected to the upper side of the sliding mechanism. The position calibration mechanism includes a fixed frame. A turbine box is fixedly connected inside the fixed frame. A servo motor is fixedly connected to one side of the fixed frame. The movable end of the servo motor is fixedly installed inside the turbine box. A transmission rod is rotatably connected inside the turbine box. A connecting block is rotatably connected to the lower part of the outer surface of the transmission rod. A driving bevel gear is fixedly connected to the lower end of the transmission rod. The driving bevel gear is meshed and connected to a driven bevel gear on the outside. The other side of the driven bevel gear is fixedly connected to a movable frame. A clamping groove is formed inside the movable frame.

[0007] Preferably, a fastening plate is fixedly clamped to the outside of the movable frame. A tripod is fixedly connected to one side of the fastening plate. A first bearing is fixedly installed on one side of the tripod. A connecting rod is fixedly connected inside the tripod. A second bearing is fixedly connected to the other side of the tripod.

[0008] Preferably, the inner side of the support is in rolling connection with the outer surfaces of the first bearing and the second bearing.

[0009] Preferably, a movable frame is fixedly connected to the middle of the outer surface of the connecting rod. A threaded rod is threadedly connected to the middle of the movable frame. The upper end of the threaded rod is rotatably connected to a limiting block. The upper side of the limiting block is fixedly connected to the upper side of the inner cavity of the support.

[0010] Preferably, a driven gear is fixedly installed on the lower part of the outer surface of the threaded rod. The lower side of the threaded rod is rotatably connected to a bottom frame. The driven gear is meshed and connected to a chain on the outside. The other end of the chain is meshed and connected to a driving gear on the inside.

[0011] Preferably, a stepping motor is fixedly installed in the middle of the driving gear. One side of the stepping motor is fixedly connected to one side of the bottom frame. The lower side of the bottom frame is fixedly connected to the upper side of the tripod.

[0012] Preferably, the filter membrane mechanism includes a membrane stack. A connecting plate is fixedly connected to the upper side of the membrane stack. A fixed clamp is fixedly connected to the upper side of the connecting plate. A long rod is fixedly clamped inside the fixed clamp. The two ends of the long rod are movably clamped to the inner walls of the clamping grooves.

[0013] Preferably, the interior of the filtration chamber is fixedly connected to one end of the water outlet end, the inner wall of the filtration chamber is fixedly connected to one side of the coarse filtration chamber, and a water inlet mechanism is fixedly connected to the upper side of the footrest and on one side of the filtration chamber.

[0014] Preferably, the water inlet mechanism includes a water inlet end, one end of the water inlet end is fixedly installed on the upper side of the coarse filtration chamber, the other end of the water inlet end is fixedly connected to a pressurizing water pump, the lower side of the pressurizing water pump is fixedly connected to a base, a sediment filter is fixedly connected inside the pressurizing water pump, and the lower side of the base is fixedly connected to the upper side of the footrest.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows.

[0016] 1. In the present invention, by setting a position calibration mechanism, when replacing a new filter membrane, the angle of the new filter membrane is automatically adjusted to avoid the problem that the new filter membrane cannot be installed. If a deviation occurs between the filter membrane mechanism and the inner wall of the filtration chamber during the installation process, the servo motor is started. The servo motor transmits power to the turbine box, and the turbine box drives the transmission rod to rotate inside the connecting block. The transmission rod drives the driving bevel gear to rotate, and the engaged driven bevel gear obtains power. Since the driven bevel gear is fixed to a movable frame, the two movable frames and the long rod rotate, thereby adjusting the angle of the membrane stack, so that the lower end of the membrane stack can be clamped into the interior of the filtration chamber, enabling the entire filter membrane mechanism to be smoothly installed into the interior of the filtration chamber, effectively alleviating the error during the movement and replacement process, and further improving the accuracy during replacement and installation, making the operation more convenient.

[0017] 2. In the present invention, by setting up a lifting mechanism and a sliding mechanism, when replacing the filter membrane, power is provided for the movement of the old and new filter membranes, facilitating the automatic replacement of the filter membrane. When automatic replacement of the filter membrane is required, the stepping motor is started, driving the driving gear to rotate. Through the transmission of the chain, the driven gear obtains power to drive the threaded rod to rotate between the limit block and the chassis. Since the moving frame is connected to the external thread of the threaded rod through the internal thread, the moving frame moves upward on the outer surface of the threaded rod. The moving frame drives the frame structure composed of three connecting rods and two tripods to move upward. There are three first bearings and two second bearings on the outer side of each tripod, which are respectively stuck in the inner side of the bracket. The three first bearings prevent misalignment in the front-back direction, and the two second bearings prevent misalignment in the left-right direction. Both ends of the frame structure are fixedly clamped to the movable frame through two fastening plates. The inside of the movable frame has bearings and can rotate. The two ends of the long rod are just clamped through two clamping slots. Thus, the filter membrane mechanism obtains an upward moving force. Under the traction of the fixed clamp and the connecting plate, the old membrane stack is extracted from the filter chamber, and the automatic replacement device is used for replacement. The long rod is taken out of the clamping slot, and a new membrane stack is clamped. The stepping motor rotates in the reverse direction, and the new filter membrane mechanism is reinstalled inside the filter chamber.

[0018] 3. In the present invention, by setting up a water inlet mechanism, during filtration, the brine in the salt lake is pre-treated for impurity removal and rough filtration, improving the filtration effect. By starting the pressurized water pump, under the extraction action of the pressurized water pump, the sediment filter extracts the brine in the salt lake. When the impurities in the brine in the salt lake pass through the sediment filter, they are removed. The brine in the salt lake after impurity removal enters the rough filtration chamber from the water inlet end under the pressure of the pressurized water pump. The brine in the salt lake after impurity removal further undergoes impurity removal in the rough filtration chamber and then enters the filter chamber for membrane separation, thus avoiding the situation that larger particle molecules in the brine in the salt lake block the filter membrane, and further improving the filtration effect of the filter membrane and the service life of the filter membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structure schematic diagram of a filtration device for membrane method lithium extraction from brine in a salt lake, which is convenient for automatically replacing the filter membrane according to the present invention;

[0020] Figure 2 is a three-dimensional structure schematic diagram of the rear view of a filtration device for membrane method lithium extraction from brine in a salt lake, which is convenient for automatically replacing the filter membrane according to the present invention;

[0021] Figure 3 is a structure schematic diagram of a filter membrane mechanism of a filtration device for membrane method lithium extraction from brine in a salt lake, which is convenient for automatically replacing the filter membrane according to the present invention;

[0022] Figure 4 is a structure schematic diagram of a water inlet mechanism of a filtration device for membrane method lithium extraction from brine in a salt lake, which is convenient for automatically replacing the filter membrane according to the present invention;

[0023] Figure 5 This is a schematic structural diagram of a lifting mechanism of a filtering device for facilitating automatic filter membrane replacement in extracting lithium from salt lake brine by membrane method;

[0024] Figure 6 This is a schematic partial structural diagram of a sliding mechanism of a filtering device for facilitating automatic filter membrane replacement in extracting lithium from salt lake brine by membrane method;

[0025] Figure 7 This is a schematic structural diagram of a position calibration mechanism of a filtering device for facilitating automatic filter membrane replacement in extracting lithium from salt lake brine by membrane method.

[0026] Legend description:

[0027] 1. Footrest; 2. Filtering chamber; 3. Filter membrane mechanism; 31. Membrane stack; 32. Connecting plate; 33. Long rod; 34. Fixed clamp; 4. Sliding mechanism; 41. Connecting rod; 42. First bearing; 43. Second bearing; 44. Tripod; 45. Fastening plate; 46. Movable frame; 47. Card slot; 5. Lifting mechanism; 51. Limiting block; 52. Threaded rod; 53. Moving frame; 54. Driven gear; 55. Chain; 56. Driving gear; 57. Stepper motor; 58. Underframe 6. Bracket; 7. Position calibration mechanism; 71. Fixed frame; 72. Turbine box; 73. Servo motor; 74. Transmission rod; 75. Connecting block; 76. Driving bevel gear; 77. Driven bevel gear; 8. Water outlet end; 9. Water inlet mechanism; 91. Water inlet end; 92. Sediment filter; 93. Pressurized water pump; 94. Base; 10. Coarse filtering chamber; 11. Rear cover. Detailed implementation manners

[0028] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0029] In the following description, many specific details are set forth to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0030] Embodiment 1

[0031] As Figure 1-7As shown in the figure, the present invention provides a filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing the filter membrane, including a tripod 1, a filtering chamber 2, a support 6, a water outlet end 8, a coarse filtering chamber 10 and a rear cover 11. The upper side of the tripod 1 is fixedly connected to the lower side of the filtering chamber 2. A support 6 is fixedly connected to the upper side of the tripod 1 and located outside the filtering chamber 2. A filter membrane mechanism 3 is movably clamped inside the filtering chamber 2. A lifting mechanism 5 is fixedly connected to the upper side of the tripod 1. A sliding mechanism 4 is fixedly connected to the inside of the lifting mechanism 5. The inner sides of the sliding mechanism 4 are movably clamped to both ends of the filter membrane mechanism 3. A position calibration mechanism 7 is fixedly connected to the upper side of the sliding mechanism 4. The position calibration mechanism 7 includes a fixed frame 71. A turbine box 72 is fixedly connected to the inside of the fixed frame 71. A servo motor 73 is fixedly connected to one side of the fixed frame 71. The movable end of the servo motor 73 is fixedly installed inside the turbine box 72. A transmission rod 74 is rotatably connected to the inside of the turbine box 72. A connecting block 75 is rotatably connected to the lower part of the outer surface of the transmission rod 74. A driving bevel gear 76 is fixedly connected to the lower end of the transmission rod 74. The outer side of the driving bevel gear 76 is meshed and connected with a driven bevel gear 77. The other side of the driven bevel gear 77 is fixedly connected to a movable frame 46. A clamping groove 47 is formed inside the inner side of the movable frame 46;

[0032] If a deviation occurs between the filter membrane mechanism 3 and the inner wall of the filtering chamber 2 during the installation process, start the servo motor 73. The servo motor 73 transmits power to the turbine box 72. The turbine box 72 drives the transmission rod 74 to rotate inside the connecting block 75. The transmission rod 74 drives the driving bevel gear 76 to rotate. The engaged driven bevel gear 77 obtains power. Since the driven bevel gear 77 is fixed to a movable frame 46, the two movable frames 46 and the long rod 33 rotate, thereby adjusting the angle of the membrane stack 31 so that the lower end of the membrane stack 31 can be clamped inside the filtering chamber 2, enabling the entire filter membrane mechanism 3 to be smoothly installed inside the filtering chamber 2. By setting the position calibration mechanism 7, when replacing a new filter membrane, the angle of the new filter membrane can be automatically adjusted, avoiding the problem that the new filter membrane cannot be installed, thus effectively alleviating the error during the mobile replacement process, and further improving the accuracy during replacement and installation, making the operation more convenient.

[0033] Embodiment 2

[0034] Such as Figure 3 、 Figure 5 and Figure 6As shown, a fastening plate 45 is fixedly clamped on the outer side of the movable frame 46. One side of the fastening plate 45 is fixedly connected to a tripod 44. One side of the tripod 44 is fixedly installed with a first bearing 42. A connecting rod 41 is fixedly connected inside the tripod 44. The other side of the tripod 44 is fixedly connected to a second bearing 43. The inner side of the bracket 6 is in rolling connection with the outer surfaces of the first bearing 42 and the second bearing 43. The middle part of the outer surface of the connecting rod 41 is fixedly connected to a moving frame 53. A threaded rod 52 is threadedly connected to the middle of the moving frame 53. The upper end of the threaded rod 52 is rotatably connected to a limiting block 51. The upper side of the limiting block 51 is fixedly connected to the upper side of the inner cavity of the bracket 6. A driven gear 54 is fixedly installed on the lower part of the outer surface of the threaded rod 52. The lower side of the threaded rod 52 is rotatably connected to a bottom frame 58. The outer side of the driven gear 54 is meshed with a chain 55. The other end inner side of the chain 55 is meshed with a driving gear 56. The middle part of the driving gear 56 is fixedly installed with a stepping motor 57. One side of the stepping motor 57 is fixedly connected to one side of the bottom frame 58. The lower side of the bottom frame 58 is fixedly connected to the upper side of the footrest 1. The filter membrane mechanism 3 includes a membrane stack 31. The upper side of the membrane stack 31 is fixedly connected to a connecting plate 32. The upper side of the connecting plate 32 is fixedly connected to a fixing clip 34. A long rod 33 is fixedly clamped inside the fixing clip 34. The two ends of the long rod 33 are movably clamped with the inner wall of the clamping groove 47;

[0035] By setting the lifting mechanism 5 and the sliding mechanism 4, when replacing the filter membrane, the power for the movement of the old and new filter membranes is provided, which is convenient for automatically replacing the filter membrane. When automatic filter membrane replacement is required, the stepping motor 57 is started to drive the driving gear 56 to rotate. Through the transmission of the chain 55, the driven gear 54 obtains power to drive the threaded rod 52 to rotate between the limiting block 51 and the bottom frame 58. Since the moving frame 53 is connected to the external thread of the threaded rod 52 through the internal thread, the moving frame 53 moves upward on the outer surface of the threaded rod 52. The moving frame 53 drives the frame structure composed of three connecting rods 41 and two tripods 44 to move upward. There are three first bearings 42 and two second bearings 43 on the outer side of each tripod 44, which are respectively clamped inside the bracket 6. The three first bearings 42 prevent misalignment in the front and rear directions, and the two second bearings 43 prevent misalignment in the left and right directions. The two ends of the frame structure are fixedly clamped with the movable frame 46 through two fastening plates 45. The movable frame 46 has bearings inside and can rotate. The two ends of the long rod 33 are just clamped by the two clamping grooves 47. Thus, the filter membrane mechanism 3 obtains an upward moving force. Under the traction of the fixing clip 34 and the connecting plate 32, the old membrane stack 31 is extracted from the filter chamber 2, and the automatic replacement device is used for replacement. The long rod 33 is taken out of the clamping groove 47, and the new membrane stack 31 is clamped. The stepping motor 57 rotates in the reverse direction, and the new filter membrane mechanism 3 is reinstalled inside the filter chamber 2.

[0036] Embodiment 3

[0037] As Figure 2 and Figure 4 shown, the inside of the filtration chamber 2 is fixedly connected to one end of the water outlet end 8, the inner wall of the filtration chamber 2 is fixedly connected to one side of the coarse filtration chamber 10, and a water inlet mechanism 9 is fixedly connected to the upper side of the tripod 1 and on one side of the filtration chamber 2. The water inlet mechanism 9 includes a water inlet end 91. One end of the water inlet end 91 is fixedly installed on the upper side of the coarse filtration chamber 10, the other end of the water inlet end 91 is fixedly connected to a pressure pump 93, a sediment filter 92 is fixedly connected inside the pressure pump 93, and the lower side of the pressure pump 93 is fixedly connected to a base 94. The lower side of the base 94 is fixedly connected to the upper side of the tripod 1;

[0038] By setting the water inlet mechanism 9, during filtration, the salt lake brine is preliminarily purified and coarsely filtered, improving the filtration effect. By starting the pressure pump 93, under the suction of the pressure pump 93, the sediment filter 92 sucks the salt lake brine. The impurities in the salt lake brine are removed when passing through the sediment filter 92. The purified salt lake brine enters the coarse filtration chamber 10 from the water inlet end 91 under the pressure of the pressure pump 93. The purified salt lake brine enters the filtration chamber 2 after further purification in the coarse filtration chamber 10 for membrane separation, thus avoiding the situation that large particle molecules in the salt lake brine block the filtration membrane, and further improving the filtration effect of the filtration membrane and the service life of the filtration membrane.

[0039] Usage method and working principle of this device: When automatic filter membrane replacement is required, the stepper motor 57 is started to drive the rotation of the driving gear 56. Through the transmission of the chain 55, the driven gear 54 obtains power to drive the threaded rod 52 to rotate between the limit block 51 and the chassis 58. Since the moving frame 53 is connected to the external thread of the threaded rod 52 through the internal thread, the moving frame 53 moves upward on the outer surface of the threaded rod 52. The moving frame 53 drives the frame structure composed of three connecting rods 41 and two tripods 44 to move upward. There are three first bearings 42 and two second bearings 43 on the outside of each tripod 44, which are respectively stuck in the inner side of the bracket 6. The three first bearings 42 prevent misalignment in the front and rear directions, and the two second bearings 43 prevent misalignment in the left and right directions. Both ends of the frame structure are fixedly clamped with the movable frame 46 through two fastening plates 45. The inside of the movable frame 46 has bearings and can rotate. The two ends of the long rod 33 are just clamped through the two clamping slots 47. Thus, the filter membrane mechanism 3 obtains an upward moving force. Under the traction of the fixed clamp 34 and the connecting plate 32, the old membrane stack 31 is extracted from the filter chamber 2, and the automatic replacement device is used for replacement. The long rod 33 is taken out of the clamping slot 47, and the new membrane stack 31 is clamped. The stepper motor 57 rotates in the reverse direction, and the new filter membrane mechanism 3 is reinstalled inside the filter chamber 2. If it is found that there is a deviation between the filter membrane mechanism 3 and the inner wall of the filter chamber 2 during the installation process, the servo motor 73 is started. The servo motor 73 transmits the power to the turbine box 72. The turbine box 72 drives the transmission rod 74 to rotate inside the connecting block 75. The transmission rod 74 drives the driving bevel gear 76 to rotate, and the engaged driven bevel gear 77 obtains power. Since the driven bevel gear 77 is fixed to a movable frame 46, the two movable frames 46 and the long rod 33 rotate. Thus, the angle of the membrane stack 31 is adjusted so that the lower end of the membrane stack 31 can be clamped inside the filter chamber 2, and the entire filter membrane mechanism 3 can be successfully installed inside the filter chamber 2.

[0040] The above is only the preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing filter membranes, comprising a tripod (1), a filtering chamber (2), a bracket (6), a water outlet end (8), a coarse filtering chamber (10) and a rear cover (11), characterized in that: The upper side of the tripod (1) is fixedly connected to the lower side of the filter chamber (2). A bracket (6) is fixedly connected to the upper side of the tripod (1) and located outside the filter chamber (2). A filter membrane mechanism (3) is movably clamped inside the filter chamber (2). A lifting mechanism (5) is fixedly connected to the upper side of the tripod (1). A sliding mechanism (4) is fixedly connected inside the lifting mechanism (5). The inner sides of the two ends of the sliding mechanism (4) are movably clamped to the filter membrane mechanism (3). A position calibration mechanism (7) is fixedly connected to the upper side of the sliding mechanism (4). The position calibration mechanism (7) includes a fixed frame (71). A turbine box (72) is fixedly connected inside the fixed frame (71). A servo motor (73) is fixedly connected to one side of the fixed frame (71). The movable end of the servo motor (73) is fixedly installed inside the turbine box (72). A transmission rod (74) is rotatably connected inside the turbine box (72). A connecting block (75) is rotatably connected to the lower part of the outer surface of the transmission rod (74). A driving bevel gear (76) is fixedly connected to the lower end of the transmission rod (74). A driven bevel gear (77) is meshed and connected to the outside of the driving bevel gear (76). A movable frame (46) is fixedly connected to the other side of the driven bevel gear (77). A clamping groove (47) is formed inside the movable frame (46).

2. The filtering device for membrane method of extracting lithium from salt lake brine, which is convenient for automatically replacing filter membrane according to claim 1, is characterized in that: A fastening plate (45) is fixedly clamped to the outside of the movable frame (46). A tripod (44) is fixedly connected to one side of the fastening plate (45). A first bearing (42) is fixedly installed on one side of the tripod (44). A connecting rod (41) is fixedly connected inside the tripod (44). A second bearing (43) is fixedly connected to the other side of the tripod (44).

3. The filtering device for membrane method extraction of lithium from salt lake brine that is convenient for automatically replacing the filter membrane according to claim 2, wherein: The inner side of the bracket (6) is in rolling connection with the outer surfaces of the first bearing (42) and the second bearing (43).

4. A filtration device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing the filter membrane according to claim 3, characterized in that: A movable frame (53) is fixedly connected to the middle of the outer surface of the connecting rod (41). A threaded rod (52) is in threaded connection with the middle of the movable frame (53). The upper end of the threaded rod (52) is rotatably connected to a limit block (51). The upper side of the limit block (51) is fixedly connected to the upper side of the inner cavity of the bracket (6).

5. A filtration device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing the filter membrane according to claim 4, characterized in that: A driven gear (54) is fixedly installed on the lower part of the outer surface of the threaded rod (52). The lower side of the threaded rod (52) is rotatably connected to a bottom frame (58). A chain (55) is meshed and connected to the outside of the driven gear (54). The inner side of the other end of the chain (55) is meshed and connected to a driving gear (56).

6. The filtering device for membrane method for extracting lithium from salt lake brine, which is convenient for automatically replacing filter membranes according to claim 5, is characterized in that: A stepping motor (57) is fixedly installed in the middle of the driving gear (56). One side of the stepping motor (57) is fixedly connected to one side of the bottom frame (58). The lower side of the bottom frame (58) is fixedly connected to the upper side of the tripod (1).

7. A filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing the filter membrane according to claim 1, characterized in that: The filter membrane mechanism (3) includes a membrane stack (31), a connecting plate (32) is fixedly connected to the upper side of the membrane stack (31), a fixing clip (34) is fixedly connected to the upper side of the connecting plate (32), a long rod (33) is fixedly clamped inside the fixing clip (34), and both ends of the long rod (33) are movably clamped with the inner wall of the clamping groove (47).

8. The filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing the filter membrane according to claim 1, is characterized in that: The interior of the filter chamber (2) is fixedly connected to one end of the water outlet end (8), the inner wall of the filter chamber (2) is fixedly connected to one side of the coarse filter chamber (10), and a water inlet mechanism (9) is fixedly connected to the upper side of the footrest (1) and on one side of the filter chamber (2).

9. A filtering device for extracting lithium from salt lake brine by membrane method, which is convenient for automatically replacing filter membranes according to claim 8, characterized in that: The water inlet mechanism (9) includes a water inlet end (91), one end of the water inlet end (91) is fixedly installed on the upper side of the coarse filter chamber (10), the other end of the water inlet end (91) is fixedly connected to a pressure pump (93), a base (94) is fixedly connected to the lower side of the pressure pump (93), a sediment filter (92) is fixedly connected inside the pressure pump (93), and the lower side of the base (94) is fixedly connected to the upper side of the footrest (1).

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