NMP solvent extraction device

Abstract

The application belongs to the technical field of NMP recovery, and specifically relates to an NMP solvent extraction device, which comprises a distillation tank for distillation separation of NMP solvent, a heating part fixedly connected to the bottom and the outer side of the bottom of the distillation tank and used for heating the distillation tank, a stirring part rotationally connected to the inside of the distillation tank, a floating part movably connected to the inside of the distillation tank and used for adjusting the stirring position of the stirring part, a crushing part movably connected to the inside of the floating part and used for scraping off the solution surface bubbles and oil film, a temperature control part movably connected to the heating part and used for controlling the starting degree of the heating part, and an adjusting part fixedly connected to the crushing part and used for adjusting the position of the crushing part. The solution drives the floating part to move upward, the floating part drives the stirring part to move upward and increase the stirring range, meanwhile, the stirring part drives the crushing part to move through the adjusting part and increase the removal range, and the floating part drives the temperature control part to move upward to open more heating parts.

Description

Technical Field

[0001] This invention belongs to the field of NMP recovery technology, specifically an NMP solvent extraction device. Background Technology

[0002] NMP is an important auxiliary material in the production of lithium-ion battery electrodes. It is expensive. When treating wastewater containing NMP, NMP recovery devices are usually used to recycle it. Existing NMP recovery devices usually use filtration and distillation methods to recover NMP from wastewater.

[0003] Chinese invention application CN117815760A discloses an NMP solvent recovery device, including a tank with a flip-top structure, a heating structure inside the tank, a cooling structure on the left side of the tank with a filter structure mounted on the cooling structure, a cleaning structure on the right side of the tank, and a transfer structure at the bottom of the tank. This NMP solvent recovery device suffers from a problem: during stirred distillation, the internal liquid level drops, and areas without solution continue to be heated, causing the solution adhering to the inside of the distillation tank to carbonize and become difficult to remove.

[0004] In the prior art, the stirring blades for stirring the solution are set inside the distillation tank and are rapidly stirred along with the distillation. The water level of the solution contained in the distillation tank decreases continuously as the distillation continues. In the case of the conventional structure, after the water level decreases, heat is continuously applied to the part of the distillation tank that has no solution. Furthermore, the contents bounce on the water surface due to stirring and adhere to the inner surface of the distillation tank at high temperature. At this time, the solution will carbonize on the inner surface of the distillation tank and is not easy to remove.

[0005] Furthermore, in the process of stirred distillation, the position and size of the stirring blades in the existing technology are fixed. Therefore, as distillation continues, the liquid level in the distillation tank will change. The stirring blades with fixed position and size cannot meet the stirring effect. For example, there may be situations where there is less solution but the rotation speed is high, or there is more solution but the rotation speed is low, which further reduces the stirring quality of the solution.

[0006] Because the stirring blades are used to agitate the solution, bubbles are generated during the agitation process. Additionally, oily substances in the solution will form an oil film on the surface. The generation of bubbles and oil film is detrimental to the continuous operation of distillation and reduces distillation efficiency. Summary of the Invention

[0007] To address the above problems, this invention provides an NMP solvent extraction device.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an NMP solvent extraction apparatus, characterized in that it comprises:

[0009] Distillation vessel, used to distill and separate NMP solvent;

[0010] The heating element is fixedly connected to the bottom and the outside of the bottom of the distillation tank and is used to heat the distillation tank.

[0011] The stirring unit is rotatably connected to the inside of the distillation tank and is used to stir the solution inside the distillation tank.

[0012] The floating section is movably connected inside the distillation tank and is used to adjust the stirring position of the stirring section;

[0013] The breaking section, which is movably connected inside the floating section, is used to scrape off bubbles and oil films on the solution surface;

[0014] The temperature control unit is movably connected to the heating unit and is used to control the start-up degree of the heating unit;

[0015] The regulating section is fixedly connected to the crushing section and is used to adjust the position of the crushing section. When the solution inside the distillation tank increases, the solution drives the floating section to move upward. The floating section drives the stirring section to extend and increase the stirring range. At the same time, the stirring section drives the crushing section to extend and increase the cleaning range through the regulating section. The floating section drives the temperature control section to move upward to open more heating sections.

[0016] Preferably, the heating element includes:

[0017] A fixed heating plate is fixedly connected to the outside of the bottom of the distillation tank;

[0018] An adjustable heating plate is fixedly connected to the outside of the distillation tank for heating the tank. There are multiple adjustable heating plates, and they are ring-shaped.

[0019] An adjustment groove, which is set on multiple adjustable heating plates, is used to provide space for the temperature control unit to move.

[0020] Preferably, the stirring section includes:

[0021] A drive motor, which is fixedly connected to the top of the distillation tank, is used to provide power;

[0022] The drive rod is fixedly connected to the output end of the drive motor at its top;

[0023] The telescopic rod has its top movably latched onto the end of the drive rod furthest from the drive motor.

[0024] The telescopic groove is formed inside the telescopic rod, and its inner diameter is the same as the outer diameter of the drive rod.

[0025] Preferably, the stirring section further includes:

[0026] A fixed rod is fixedly connected to the end of the telescopic rod away from the drive rod.

[0027] The hydraulic groove is located inside the fixed rod, and there are multiple hydraulic grooves. The multiple hydraulic grooves are connected to the telescopic groove, and the hydraulic groove and the telescopic groove are filled with hydraulic oil.

[0028] The adjusting rod is movably connected inside the hydraulic groove;

[0029] The stirring blade is fixedly connected to the end of the adjusting rod away from the fixed rod and is used to stir the solution.

[0030] Preferably, the floating part includes:

[0031] A floating ring is movably positioned inside the distillation jar, with its outer surface in contact with the inner wall of the distillation jar;

[0032] A rotating groove is formed on the inner surface of the floating ring on the side away from the distillation vessel;

[0033] A connecting rod, one end of which is movably connected to the inside of the rotating groove, and there are multiple connecting rods;

[0034] The mounting slot, located at the bottom of the connecting rod, provides space for the movement of the crushing section;

[0035] The contact plate is fixedly connected to the outside of the telescopic rod, and the outer surface of the contact plate is fixedly connected to multiple connecting rods.

[0036] Preferably, the crushing section includes:

[0037] The slide bar is movably connected inside the mounting slot;

[0038] The reset assembly consists of multiple reset assemblies, one end of which is fixedly connected to the inside of the connecting rod, and the other end of which is fixedly connected to the slide rod.

[0039] Top blocks, multiple top blocks are fixedly connected to the side of the slide bar away from the reset assembly;

[0040] A pin, consisting of multiple pins fixedly connected to the outer surface of the top block, is used to puncture air bubbles generated during stirring.

[0041] Preferably, the temperature control unit comprises:

[0042] The slot is formed on the surface where the floating ring contacts the distillation vessel, and its position corresponds to the adjustment groove;

[0043] A height sensor, which is fixedly connected inside the slot, is used to detect the height between the floating ring and the bottom of the distillation tank;

[0044] An adjusting block is movably connected to the outside of the distillation tank and slides inside the adjusting groove. Its position is adjusted by electric drive and rises and falls in accordance with the height sensor.

[0045] A touch switch is fixedly connected to the adjustable heating plate to control the switching of the adjustable heating plate. It is located on the movement path of the adjusting block, and the sum of the lateral dimensions of the touch switch and the adjusting block is greater than the lateral dimension of the adjusting groove.

[0046] Preferably, the adjustment section includes:

[0047] Drive blocks, multiple drive blocks are fixedly connected to the side of the stirring blade away from the fixed rod;

[0048] Driven blocks, multiple driven blocks are fixedly connected to the upper part of the slide rod, and are located on the side of the slide rod away from the telescopic rod. The driving block and driven blocks are magnets with opposite magnetic forces on their facing end faces.

[0049] Preferably, a pressure gauge is fixedly connected to the top of the distillation tank to detect the internal pressure value. An exhaust pipe is fixedly connected to the top of the distillation tank to discharge water vapor. An outlet is fixedly connected to one side of the distillation tank to discharge the purified NMP solution. An inlet is fixedly connected to one side of the distillation tank to introduce wastewater into the distillation tank. A control valve is installed on the inlet, and the control valve is also installed on the outlet and the exhaust pipe to control the opening or closing of the pipeline. A filter plate is movably installed inside the distillation tank to filter larger solid impurities in the wastewater. A shaking part is fixedly connected to the bottom of the filter plate to shake the filter plate.

[0050] Preferably, the swaying part includes:

[0051] A rocking rod is fixedly connected to the bottom of the filter plate;

[0052] The bumps are movably connected to the top of the contact plate, and the shape of the bumps is that the top is raised and the bottom is straight.

[0053] A transmission assembly used to adjust the extension length of the protrusion;

[0054] Multiple elastic rods are fixedly connected at the top to the bottom of the filter plate, and their bottoms are fixedly connected to the floating part.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0056] 1. The present invention uses a floating part and a temperature control part to work together. When the liquid level inside the distillation tank decreases due to the distillation process or rises due to refilling, the liquid level will drive the floating part to rise or fall. This allows the temperature control part to open or close the heating part to achieve different heating heights, thus avoiding continuous heating in areas without solution, which can lead to carbonization.

[0057] 2. This invention utilizes the combined operation of a floating section and a stirring section. When the liquid level inside the distillation tank decreases due to the distillation process or rises due to refilling, the liquid level will cause the floating section to rise or fall, thereby causing the stirring section to rise or fall. This ensures that the stirring blades are always located in the center of the liquid surface, resulting in a better stirring effect. Furthermore, the stirring blades can be extended or shortened from the fixed rod, further enhancing the stirring effect and preventing excessive stirring that would generate too many bubbles and reduce distillation efficiency.

[0058] 3. This invention utilizes the combined operation of a floating section and a breaking section. When the liquid level in the distillation tank rises, the floating section drives the stirring section to rise and extend more stirring blades. The adjusting section further extends the breaking section, which, when there is a large amount of solution, punctures the bubbles generated by stirring and gathers the oil film, effectively preventing the bubbles and oil film generated by stirring from hindering the distillation operation.

[0059] 4. The present invention utilizes the coordinated operation of the shaking part and the floating part. When the liquid level in the distillation tank changes, the elastic rod drives the filter plate to move up and down, scraping the inner wall of the distillation tank. Furthermore, the movement of the crushing part drives the movement of the protrusions, thereby causing the filter plate to shake up and down, preventing impurities from accumulating and preventing steam from being unable to pass through the filter plate smoothly. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0061] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0062] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0063] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0064] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0065] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0066] Figure 7 This is a partial top view of the structure of the present invention;

[0067] Figure 8 This is a partial three-dimensional structural schematic diagram of the present invention.

[0068] In the diagram: 1. Distillation tank; 101. Pressure gauge; 102. Exhaust pipe; 103. Control valve; 104. Liquid outlet; 105. Liquid inlet; 106. Filter plate; 2. Heating section; 201. Fixed heating plate; 202. Adjustable heating plate; 203. Adjustment tank; 3. Stirring section; 301. Drive motor; 302. Drive rod; 303. Telescopic rod; 304. Telescopic tank; 305. Fixed rod; 306. Hydraulic tank; 307. Adjustment rod; 308. Stirring blade; 4. Floating section; 401. Floating ring 402. Rotating groove; 403. Connecting rod; 404. Mounting groove; 405. Contact plate; 5. Crushing part; 501. Slide rod; 502. Reset assembly; 503. Top block; 504. Top pin; 6. Temperature control part; 601. Slot; 602. Height sensor; 603. Adjusting block; 604. Touch switch; 7. Shaking part; 701. Shaking rod; 702. Protrusion; 703. Rotating rod; 704. Torsion spring; 705. Elastic rod; 8. Adjusting part; 801. Drive block; 802. Driven block. Detailed Implementation

[0069] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by users of ordinary skills in the art without creative effort are within the scope of protection of the present invention.

[0070] This invention provides, for example Figures 1 to 8 The NMP solvent extraction apparatus shown includes a distillation tank 1 for distilling and separating NMP solvent; and a heating unit 2, which is fixedly connected to the bottom and the outside of the bottom of the distillation tank 1 for heating the distillation tank 1. The heating unit 2 is divided into a fixed heating plate 201 and an adjustable heating plate 202, and is regulated by a temperature control unit 6. The adjustable heating plate 202 is opened or closed according to the solution condition inside the distillation tank 1 to avoid carbonization caused by continuous heating in areas without solution.

[0071] The stirring unit 3 is rotatably connected inside the distillation tank 1 to stir the solution inside. The stirring unit 3 can change its stirring position according to the liquid level, ensuring the stirring is always in the middle of the liquid surface for good stirring effect. The stirring blades 308 extend or retract according to the rise or fall of the liquid level. When there is a large amount of solution inside the distillation tank 1, the stirring range of the stirring blades 308 is expanded to ensure thorough stirring. The floating unit 4 is movably connected inside the distillation tank 1 to adjust the stirring position of the stirring unit 3. The floating unit 4 rises and falls according to changes in the liquid level, thereby driving the movement of other components. The breaking unit 5 is movably connected inside the floating unit 4 to break up air bubbles on the surface of the solution. The temperature control unit 6 is movably connected to the heating unit 2 to control the activation level of the heating unit 2. The adjusting unit 8 is fixedly connected to the breaking unit 5 to adjust its position. When the amount of solution inside the distillation tank 1 increases, the solution drives the floating unit 4 to move. The moving part 4 moves upward, and the floating part 4 drives the stirring part 3 to move upward. At the same time, due to the hydraulic mechanism inside the stirring part 3, the stirring blade 308 will extend and increase the stirring range. This ensures that the more solution inside the distillation tank 1, the greater the stirring amplitude and the better the stirring effect. The stirring part 3 drives the breaking part 5 to extend and increase the cleaning range through the adjusting part 8. The driving block 801 will gradually approach the driven block 802 due to the extension of the stirring blade 308. Due to the magnetic force, the sliding rod 501 will move downward. Therefore, the more solution there is, the more the breaking part 5 extends, and the more bubbles generated by stirring will be broken. The floating part 4 drives the temperature control part 6 to move upward to open more of the heating part 2. As the stirring and evaporation continue, the liquid level will continue to drop. At this time, the floating part 4 will drive the temperature control part 6 to move downward to close part of the heating part 2. In this way, the part without solution will not be continuously heated, which can effectively prevent the solution adhering to the inner wall of the distillation tank 1 from carbonizing.

[0072] The heating unit 2 includes a fixed heating plate 201, which is fixedly connected to the outside of the bottom of the distillation tank 1. When there is a solution inside the distillation tank 1, the fixed heating plate 201 continuously heats the distillation tank 1. There are multiple adjustable heating plates 202, which are fixedly connected to the outside of the distillation tank 1 and are used to heat the distillation tank 1. The adjustable heating plates 202 are ring-shaped. The adjustable heating plates 202 can be opened or closed according to the solution inside the distillation tank 1 by the rise and fall of the temperature control unit 6 to ensure the heating effect and avoid carbonization caused by continuous heating of the part without liquid surface. The adjustment tank 203 is set on the multiple adjustable heating plates 202 and is used to provide space for the movement of the temperature control unit 6. When the solution inside the distillation tank 1 changes, the floating part 4 drives the temperature control unit 6 to move. The adjustment block 603 moves under the drive of the height sensor 602. During the movement, it will contact the touch switch 604. Moving upwards will open the adjustable heating plate 202 through the touch switch 604, and moving downwards will close the touch switch 604 to close the adjustable heating plate 202.

[0073] The stirring unit 3 includes a drive motor 301, which is fixedly connected to the top of the distillation tank 1 to provide power;

[0074] A drive rod 302 is fixedly connected at its top to the output end of a drive motor 301; a telescopic rod 303 is movably engaged at its top at the end of the drive rod 302 away from the drive motor 301; a telescopic groove 304 is formed inside the telescopic rod 303, and its inner diameter is the same as the outer diameter of the drive rod 302; a fixed rod 305 is fixedly connected to the end of the telescopic rod 303 away from the drive rod 302; a hydraulic groove 306 is formed inside the fixed rod 305, and there are multiple hydraulic grooves 306, which communicate with the telescopic groove 304, and the hydraulic grooves 306 and the telescopic groove 304 are filled with hydraulic oil; an adjusting rod 307 is movably connected inside the hydraulic groove 306; and a stirring blade 308 is fixedly connected to the end of the adjusting rod 307 away from the fixed rod 305 for stirring the solution.

[0075] During operation, solution enters the distillation tank 1 through the inlet 105. The rising liquid level causes the floating part 4 to rise. Since the contact plate 405 of the floating part 4 is fixedly connected to the telescopic rod 303, it drives the telescopic rod 303 to move upward. Because the telescopic groove 304 is filled with hydraulic oil, the upward movement of the telescopic rod 303 forces the hydraulic oil into the hydraulic groove 306, causing the adjusting rod 307 and the stirring blade 308 to extend. This gives the stirring blade 308 a larger stirring range. At the same time, due to the fixed connection between the floating part 4 and the telescopic rod 303, the stirring position of the stirring blade 308 is always in the middle position below the liquid level, resulting in better stirring effect and effectively accelerating evaporation. As the stirring and evaporation continue, the liquid level drops. While the floating part 4 drives the stirring part 3 to move downward, the stirring blade 308 shortens. This makes the stirring slower and more stable when there is less solution inside the distillation tank 1, preventing excessive bubbles from being generated due to vigorous stirring, which would affect the evaporation efficiency.

[0076] The floating part 4 includes a floating ring 401, which is movably disposed inside the distillation tank 1 and whose outer surface is in contact with the inner wall of the distillation tank 1. The floating ring 401 is made of a material with a density less than that of the solution. A rotating groove 402 is formed on the inner surface of the floating ring 401 on the side away from the distillation tank 1. The rotating groove 402 provides space for the rotation of the connecting rod 403. One end of the connecting rod 403 is movably connected to the inside of the rotating groove 402. There are multiple connecting rods 403. The connecting rods 403 connect the floating ring 401 to the contact plate 405, so that the floating ring 401 and the contact plate 405 can move synchronously. A mounting groove 404 is formed at the bottom of the connecting rod 403 to provide space for the movement of the crushing part 5. The contact plate 405 is fixedly connected to the outside of the telescopic rod 303, and the outer surface of the contact plate 405 is fixedly connected to multiple connecting rods 403.

[0077] During operation, solution enters the distillation tank 1 through inlet 105. Since the density of the floating ring 401 is less than that of the solution, the continuous inflow of solution and the rise of the liquid level will drive the floating ring 401 to rise. The floating ring 401 drives the contact plate 405 to rise synchronously through the connecting rod 403. The contact plate 405 is fixedly connected to the telescopic rod 303, which will drive the telescopic rod 303 to move upward synchronously, thereby extending the stirring blade 308 to achieve a larger stirring range. As the stirring and evaporation continue, the solution inside the distillation tank 1 will drop, and the floating ring 401 will simultaneously drive the stirring blade 308 to move downward while shortening the extension distance.

[0078] The crushing section 5 includes a slide rod 501, which is movably connected inside the mounting groove 404. The slide rod 501 can move up and down inside the mounting groove 404 and drive the top block 503 to move synchronously. A reset assembly 502, multiple reset assemblies 502, one end of which is fixedly connected inside the connecting rod 403, and the other end of which is fixedly connected to the slide rod 501. The reset assembly 502 is elastic and drives the slide rod 501 to elastically reset. A top block 503, multiple top blocks 503 are fixedly connected to the side of the slide rod 501 away from the reset assembly 502. A pin 504, multiple pins 504 are fixedly connected to the outer surface of the top block 503 for piercing the air bubbles generated by stirring. The slide rod 501 drives the pins 504 to move downward through the top block 503. The number of pins 504 extending out of the mounting groove 404 increases, and the number of air bubbles pierced by the pins 504 increases.

[0079] During operation, as the liquid level rises inside the distillation tank 1, the stirring blade 308 extends further. The distance between the driving block 801 on the stirring blade 308 and the driven block 802 on the slide rod 501 gradually decreases. Therefore, under the influence of magnetic force, the driven block 802 drives the slide rod 501 downwards. This downward movement of the slide rod 501 pushes the top block 503 out of the mounting groove 404, causing the ejector pin 504 on the top block 503 to protrude. The more liquid inside the distillation tank 1, the further the stirring blade 308 extends. Therefore, under the action of the driven block 802, the extension length of the top block 503 increases. As the drive motor 301 drives the telescopic rod 303 and the connecting rod 403 to rotate, the ejector pin 504 will puncture the bubbles generated by stirring to prevent the accumulation of bubbles from affecting the continuous evaporation. As evaporation continues, the solution level drops, the amount of bubbles generated by stirring will decrease, and the extension length of the top block 503 will also decrease. This allows the extension length of the top block 503 to match the amount of bubbles, ensuring the accurate operation of the ejector pin 504.

[0080] The temperature control unit 6 includes a slot 601, which is formed on the surface of the floating ring 401 that contacts the distillation tank 1, and its position corresponds to the adjustment groove 203; a height sensor 602, which is fixedly connected inside the slot 601, for detecting the height value between the floating ring 401 and the bottom of the distillation tank 1; an adjustment block 603, which is movably connected to the outside of the distillation tank 1 and slides inside the adjustment groove 203, and its position is adjusted by electric drive to rise and fall in correspondence with the height sensor 602; and a touch switch 604, which is fixedly connected to the adjustable heating plate 202, for controlling the switching of the adjustable heating plate 202, and is located on the movement path of the adjustment block 603, and the sum of the lateral dimensions of the touch switch 604 and the adjustment block 603 is greater than the lateral dimension of the adjustment groove 203.

[0081] When the liquid level inside the distillation tank 1 rises, the floating ring 401 moves upward, causing the height sensor 602 mounted on the floating ring 401 to move upward. The height sensor 602 senses the increase in position and electrically drives the adjusting block 603 to move upward as well. Since the sum of the lateral dimensions of the touch switch 604 and the adjusting block 603 is greater than the lateral dimension of the adjusting groove 203, the upward movement of the adjusting block 603 will contact the touch switch 604 and turn on the adjustable heating plate 202. This effectively ensures that the area with solution continues to be heated. As evaporation continues, the liquid level inside the distillation tank 1 will drop, and the height sensor 602 senses the decrease in position. Therefore, the adjusting block 603 will be driven downward simultaneously to close the adjustable heating plate 202 in the area without liquid, preventing carbonization caused by continuous heating in the area without solution.

[0082] The adjustment unit 8 includes: a drive block 801, a plurality of drive blocks 801 being fixedly connected to the stirring blade 308 on the side away from the fixed rod 305; and a driven block 802, a plurality of driven blocks 802 being fixedly connected to the upper part of the slide rod 501, and being located on the side of the slide rod 501 away from the telescopic rod 303, and the drive block 801 and the driven block 802 are magnets with opposite magnetic forces on their facing end faces.

[0083] In actual operation, the drive block 801 will rotate with the rotation of the stirring blade 308, while the driven block 802 will rotate with the floating ring 401. The positions of the drive block 801 and the driven block 802 are always corresponding. When the liquid level rises, the stirring blade 308 extends, reducing the distance between the drive block 801 and the driven block 802. Under the action of magnetic force, the slide bar 501 will be driven down, increasing the extension distance of the crushing part 5.

[0084] A pressure gauge 101 is fixedly connected to the top of the distillation tank 1 to detect the internal pressure value. An exhaust pipe 102 is fixedly connected to the top of the distillation tank 1 to discharge water vapor. An outlet 104 is fixedly connected to one side of the distillation tank 1 to discharge the NMP solution after distillation and purification. An inlet 105 is fixedly connected to one side of the distillation tank 1 to introduce wastewater into the distillation tank 1. A control valve 103 is installed on the inlet 105, and the control valve 103 is also installed on the outlet 104 and the exhaust pipe 102 to control the opening or closing of the pipeline. A filter plate 106 is movably installed inside the distillation tank 1 to filter larger solid impurities in the wastewater. A shaking part 7 is fixedly connected to the bottom of the filter plate 106 to shake the filter plate 106. A dirt collection window is opened at the lower end of the filter plate 106 in the distillation tank 1 to recover impurities above the filter plate 106.

[0085] The swaying part 7 includes a swaying rod 701, which is fixedly connected to the bottom of the filter plate 106; a plurality of protrusions 702, which are movably connected to the top of the contact plate 405, and the protrusions 702 are shaped as a rod with a raised top and a straight bottom; the transmission assembly includes a rotating rod 703 and a torsion spring 704, the rotating rod 703 is rotatably connected to the inside of the contact plate 405 through a rotating shaft, and is used to adjust the position of the protrusions 702; the torsion spring 704, whose outer end is fixedly connected to the inside of the rotating rod 703, and whose inner end is fixedly connected to the outside of the rotating shaft, is used to reset the rotating rod 703 when no external force is applied; and an elastic rod 705, the top of which is fixedly connected to the bottom of the filter plate 106, and whose bottom is fixedly connected to the floating part 4, the elastic rod 705 being a rod with a certain telescopic function at the top.

[0086] When the solution is injected through the inlet 105, it first passes through the filter plate 106 to filter out larger solid impurities. Simultaneously, due to the action of the drive motor 301, the contact plate 405 is continuously rotated. The protrusion 702 on the contact plate 405 repeatedly pushes the rocking rod 701 up and down, causing the filter plate 106 to move up and down. Because the filter plate 106 is inclined, this process accumulates the filtered impurities at the lower part of the filter plate 106, facilitating subsequent recycling. The continuous rocking of the filter plate 106 also prevents impurities from clogging it during filtration. 06 can lead to a situation where the solution cannot continuously enter and the evaporated gas cannot pass through the filter plate 106. During this process, due to the rise in the liquid level, the extension distance of the slide rod 501 will increase to break the bubbles generated by stirring. The movement of the slide rod 501 will drive the rotating rod 703 to rotate. The rotation of the rotating rod 703 will push up the protrusion 702. Therefore, the vertical distance between the top of the protrusion 702 and the top of the contact plate 405 will increase. As the solution inside the distillation tank 1 increases, the shaking degree of the filter plate 106 driven by the shaking rod 701 will also increase. This can effectively avoid insufficient filtration and affect the discharge of evaporated gas due to the clogging of the filter plate 106.

[0087] Throughout the process, the inlet 105 is opened by the control valve 103, and the solution to be treated is introduced into the distillation tank 1 through the inlet 105. The fixed heating plate 201 is opened to heat the distillation tank 1. As evaporation proceeds, the water in the solution is evaporated into water vapor and discharged through the exhaust pipe 102. The remaining part inside the distillation tank 1 is the purified NMP solution, which is discharged through the outlet 104.

[0088] As the solution inside the distillation tank 1 increases, the solution level rises. Driven by the solution, the floating ring 401 floats upwards, causing the connecting rod 403 and the contact plate 405 to rise. The contact plate 405 is fixedly connected to the telescopic rod 303, which moves upwards, positioning the stirring blade 308 at the bottom of the telescopic rod 303 below the liquid surface. This effectively ensures the stirring effect of the stirring blade 308. Because hydraulic oil is installed inside the telescopic groove 304, the upward movement of the telescopic rod 303 causes the drive rod 302 to penetrate deeper into the telescopic groove 304, driving the hydraulic oil... As the hydraulic oil moves into the hydraulic tank 306, the connecting rod 403 is pushed out of the hydraulic tank 306. The connecting rod 403 drives the stirring blade 308 to extend. As the solution inside the distillation tank 1 increases, the extension distance of the stirring blade 308 increases, and the stirring range also increases, resulting in a better stirring effect. As evaporation continues, the water inside the solution evaporates in the form of water vapor and is discharged through the exhaust pipe 102. The liquid level will drop accordingly, and the floating ring 401 will also drop, thereby reducing the extension length of the stirring blade 308. This makes the stirring more stable when the solution is less, thus reducing the bubbles generated by stirring.

[0089] When the liquid level inside the distillation tank 1 rises, the floating ring 401 moves upward, causing the height sensor 602 mounted on the floating ring 401 to move upward. The height sensor 602 senses the increase in the liquid level and, through electric drive, adjusts the regulating block 603 to move upward along the regulating groove 203. The regulating block 603 contacts the touch switch 604 and turns on the adjustable heating plate 202. This effectively ensures that the area with solution continues to be heated. As evaporation continues, the liquid level inside the distillation tank 1 will drop. The height sensor 602 senses the decrease in the position, so the regulating block 603 will be driven downward simultaneously to close the adjustable heating plate 202 in the area without liquid, thus preventing carbonization caused by continuous heating in the area without solution.

[0090] During the process of injecting the solution into the distillation tank 1 and stirring, bubbles will accumulate on the upper surface of the solution. The solution also contains oily substances, forming an oil film on the surface. The formation of bubbles and oil film affects evaporation. Therefore, a breaking section 5 is provided to remove bubbles and oil film. As the solution continues to be injected into the distillation tank 1, the stirring blade 308 extends continuously. The distance between the driving block 801 on the stirring blade 308 and the driven block 802 on the slide rod 501 continuously decreases. Under the action of magnetic force, the driven block 802 drives the slide rod 501 to move... As the liquid moves downward, the slide bar 501 drives the top block 503 and the ejector pin 504 to extend out of the mounting groove 404, breaking up the oil film and bubbles on the liquid surface. At the same time, the more solution inside the distillation tank 1, the longer the stirring blade 308 extends, and the longer the top block 503 and ejector pin 504 extend. This can meet the breaking work when there are many bubbles generated by stirring when there is a lot of solution. As evaporation proceeds, the solution decreases, so the amount of bubbles generated by stirring will decrease accordingly, and the extension of the top block 503 and ejector pin 504 will decrease accordingly. This can ensure that the breaking operation area of ​​the ejector pin 504 corresponds to the bubble area, resulting in a better breaking effect.

[0091] When the external solution to be treated enters the distillation tank 1, it first passes through the filter plate 106. The filter plate 106 isolates larger particulate impurities in the solution, preventing them from entering the interior of the distillation tank 1 and damaging other components. As the solution is continuously added and the liquid level rises, the filter plate 106 is driven upward because the floating ring 401 is connected to the filter plate 106 through the elastic rod 705. During this process, the filter plate 106 rises to its maximum height but is still at the bottom of the liquid inlet 105. The upward movement of the filter plate 106 scrapes the inner wall of the distillation tank 1, preventing impurities from accumulating for a long time and becoming difficult to clean.

[0092] Meanwhile, due to the action of the drive motor 301, the contact plate 405 will be driven to rotate continuously. The protrusion 702 set on the contact plate 405 will repeatedly push the shaking rod 701 up and down, which will cause the filter plate 106 to move up and down. Since the filter plate 106 is inclined, this process will accumulate the filtered impurities in the lower part of the filter plate 106, which is convenient for subsequent recycling. At the same time, the constantly shaking filter plate 106 can also prevent impurities from clogging the filter plate 106 during the filtration process, which would prevent the solution from continuously entering and the evaporated gas from passing through the filter plate 106.

[0093] During the above process, the rise in liquid level causes the slide bar 501 to extend further to break up the bubbles generated by stirring. The movement of the slide bar 501 drives the rotating rod 703 to rotate. The rotation of the rotating rod 703 lifts the protrusion 702, thus increasing the vertical distance between the top of the protrusion 702 and the top of the contact plate 405. As the amount of solution inside the distillation tank 1 increases, the shaking degree of the filter plate 106 driven by the shaking rod 701 also increases, which can effectively prevent insufficient filtration and affect the discharge of evaporated gas due to the clogging of the filter plate 106.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0095] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An NMP solvent extraction apparatus, characterized in that, include: Distillation vessel, used to distill and separate NMP solvent; A heating unit is fixedly connected to the bottom and outer side of the distillation tank for heating the distillation tank. The heating unit includes: a fixed heating plate fixedly connected to the outer side of the bottom of the distillation tank; multiple adjustable heating plates fixedly connected to the outer side of the distillation tank for heating the distillation tank, and the adjustable heating plates are ring-shaped; and an adjustment groove is provided on the multiple adjustable heating plates to provide space for the movement of the temperature control unit. The stirring unit includes a drive rod, a telescopic rod, and a telescopic groove, which are rotatably connected to the inside of the distillation tank for stirring the solution inside the distillation tank. The stirring unit includes: a fixed rod, which is fixedly connected to the end of the telescopic rod away from the drive rod; multiple hydraulic grooves, which are formed inside the fixed rod and communicate with the telescopic groove, and the hydraulic groove and the telescopic groove are filled with hydraulic oil; an adjusting rod, which is movably connected to the inside of the hydraulic groove; and stirring blades, which are fixedly connected to the end of the adjusting rod away from the fixed rod for stirring the solution. A floating section, movably connected inside the distillation tank, is used to adjust the stirring position of the stirring section; a crushing section, movably connected inside the floating section, is used to crush air bubbles on the surface of the solution; the floating section includes: a floating ring, movably disposed inside the distillation tank, with its outer surface in contact with the inner wall of the distillation tank; a rotating groove, formed on the inner surface of the floating ring on the side away from the distillation tank; multiple connecting rods, one end of which is movably connected inside the rotating groove; a mounting groove, formed at the bottom of the connecting rod, for providing space for the movement of the crushing section; and a contact plate, fixedly connected to the outside of the telescopic rod, with its outer surface fixedly connected to multiple connecting rods. The temperature control unit is movably connected to the heating unit and is used to control the start-up degree of the heating unit; the adjustment unit is fixedly connected to the crushing unit and is used to adjust the position of the crushing unit; the temperature control unit includes: a slot, which is formed on the surface where the floating ring contacts the distillation tank, and its position corresponds to the adjustment slot; a height sensor, which is fixedly connected inside the slot and is used to detect the height value between the floating ring and the bottom of the distillation tank; an adjustment block, which is movably connected to the outside of the distillation tank and slides inside the adjustment slot, and its position is adjusted by electric drive to rise and fall in accordance with the height sensor; a touch switch, which is fixedly connected to the adjustable heating plate and is used to control the switching of the adjustable heating plate, and is located on the movement path of the adjustment block, and the sum of the lateral dimensions of the touch switch and the adjustment block is greater than the lateral dimension of the adjustment slot; As the solution inside the distillation tank increases, the solution causes the floating part to move upward. The floating part causes the stirring part to extend and increase the stirring range. The stirring part, through the adjusting part, causes the crushing part to extend and increase the cleaning range. The floating part causes the temperature control part to move upward to open more heating parts.

2. The NMP solvent extraction apparatus according to claim 1, characterized in that, The stirring section includes: A drive motor, which is fixedly connected to the top of the distillation tank, is used to provide power; The drive rod is fixedly connected to the output end of the drive motor at its top; The telescopic rod has its top movably latched onto the end of the drive rod furthest from the drive motor. The telescopic groove is formed inside the telescopic rod, and the inner diameter of the telescopic groove is the same as the outer diameter of the drive rod.

3. The NMP solvent extraction apparatus according to claim 1, characterized in that, The fragmented part includes: The slide bar is movably connected inside the mounting slot; The reset assembly consists of multiple reset assemblies, one end of which is fixedly connected to the bottom of the mounting slot, and the other end of which is fixedly connected to the slide rod. Top blocks, multiple top blocks are fixedly connected to the side of the slide bar away from the reset assembly; A pin, consisting of multiple pins fixedly connected to the outer surface of the top block, is used to puncture air bubbles generated during stirring.

4. The NMP solvent extraction apparatus according to claim 3, characterized in that, The regulating unit includes: Drive blocks, multiple drive blocks are fixedly connected to the side of the stirring blade away from the fixed rod; Driven blocks, multiple driven blocks are fixedly connected to the upper part of the slide rod, and are located on the side of the slide rod away from the telescopic rod. The driving block and driven blocks are magnets with opposite magnetic forces on their facing end faces.

5. The NMP solvent extraction apparatus according to claim 1, characterized in that, A pressure gauge is fixedly connected to the top of the distillation tank to detect the internal pressure. An exhaust pipe is also fixedly connected to the top of the distillation tank to discharge water vapor. An outlet is fixedly connected to one side of the distillation tank to discharge the purified NMP solution. An inlet is fixedly connected to one side of the distillation tank to introduce wastewater into the tank. A control valve is installed on the inlet, and the control valve is also installed on the outlet and exhaust pipe to control the opening and closing of the pipeline. A filter plate is movable inside the distillation tank to filter out larger solid impurities in the wastewater. A swaying part is fixedly connected to the bottom of the filter plate to shake it.

6. The NMP solvent extraction apparatus according to claim 5, characterized in that, The swaying part includes: A rocking rod is fixedly connected to the bottom of the filter plate; The bumps are movably connected to the top of the contact plate, and the shape of the bumps is that the top is raised and the bottom is straight. A transmission assembly used to adjust the extension length of the protrusion; Multiple elastic rods are fixedly connected at the top to the bottom of the filter plate, and their bottoms are fixedly connected to the floating part.

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