NMP waste liquid recovery equipment and recovery process thereof

Abstract

The application discloses a kind of NMP waste liquid recovery equipment, it is related to NMP waste liquid recovery technical field, including spraying storehouse, filter plate, spraying cavity, air inlet cavity, air inlet pipe, telescopic unit, exhaust pipe, exhaust port, air bag;Water inlet pipe is vertically worn in the top of the spraying storehouse, and can freely slide up and down, one end of the water inlet pipe is inserted into the spraying cavity and is fixedly connected with mounting seat, the mounting seat is worn with spraying pipe that can freely rotate, the spraying pipe is provided with the communication port that is penetrated with the water inlet pipe, and the pipe wall of the spraying pipe is provided with multiple spray heads;For when the water inlet pipe moves up and down, the rotation driving unit for driving the spraying pipe to rotate is arranged.The air bag and telescopic unit are arranged in the application, when spraying water is accumulated in the air inlet cavity, as liquid level rises, air bag will drive telescopic unit and exhaust pipe to move upwards, avoid exhaust port on exhaust pipe to be flooded by spraying water, and then cause the phenomenon that spraying water flows out from exhaust port.

Description

Technical Field

[0001] This invention relates to the field of NMP waste liquid recycling technology, specifically to an NMP waste liquid recycling device and its recycling process. Background Technology

[0002] N-Methylpyrrolidone (NMP) is a highly soluble aprotic solvent widely used in industries such as lithium batteries, pharmaceuticals, pesticides, electronics, and petrochemicals. In the lithium battery manufacturing process, NMP itself does not enter the final lithium battery product, but is used as a solvent for dispersing binders. It volatilizes through a drying process at a certain temperature, and the waste gas containing NMP is recycled to generate NMP waste liquid.

[0003] Chinese Patent Publication No. CN111545017B discloses an NMP waste liquid recovery device, belonging to the field of organic gas recovery technology. It includes a frame with a tower body mounted on it. The tower body, from bottom to top, includes a liquid storage chamber, an adsorption chamber, and a spray chamber. An adsorption device and a spray device are installed inside the tower body. An air inlet pipe, a liquid outlet pipe, and a water supply pipe are connected to the outer wall of the tower body. An air supply pipe is connected to the end of the air inlet pipe located inside the tower body. The air supply pipe includes a first air supply pipe and a second air supply pipe. The second air supply pipe has multiple exhaust pipes, each with multiple outlet pipes. Each outlet pipe has a one-way valve. A connecting pipe is installed on the first air supply pipe, and the second air supply pipe is rotatably connected to the connecting pipe. A driving component is installed at the bottom of the tower body to drive the second air supply pipe to rotate. The driving component can drive the multiple outlet pipes and their respective outlet pipes to rotate, which can agitate the water at the bottom of the tower body, improving the dissolution effect of the gas in the water.

[0004] In the aforementioned prior art recovery device, when spraying NMP exhaust gas, the spray water is sprayed downwards from multiple spray heads to spray the NMP exhaust gas. Since the spray heads are installed at a fixed height within the recovery device, and there is a certain distance between the spray heads and the top wall of the recovery device, the spray heads cannot reach the space corresponding to this distance. Therefore, when NMP exhaust gas enters this space, the spray heads cannot spray the NMP exhaust gas. Furthermore, NMP exhaust gas generally enters the recovery device through multiple outlet pipes. When the accumulated liquid level of the spray water in the recovery device rises, the liquid level of the spray water is higher than the opening of the outlet pipes, causing spray water to enter the outlet pipes and affecting the entry of NMP exhaust gas into the recovery device. The aforementioned prior art uses one-way valves to prevent spray water from entering the outlet pipes, but since each outlet pipe requires a one-way valve, this leads to a significant increase in cost.

[0005] Therefore, we propose an NMP waste liquid recovery device and its recovery process. Summary of the Invention

[0006] The purpose of this invention is to provide an NMP waste liquid recovery device and its recovery process to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an NMP waste liquid recovery device, comprising: A spray chamber is provided, with a filter plate fixedly connected inside. The filter plate divides the interior of the spray chamber into a spray cavity and an air inlet cavity from top to bottom. An air inlet pipe is provided at the lower end of the spray chamber. A telescopic unit is fixedly connected to one end of the air inlet pipe that enters the spray chamber. The telescopic unit is connected to multiple exhaust pipes, each with multiple exhaust ports. An airbag is connected to the telescopic unit and is located below the exhaust pipes. A water inlet pipe is vertically installed at the top of the spray chamber and can slide freely up and down. One end of the water inlet pipe is fixed to a mounting base after entering the spray chamber. A spray pipe that can rotate freely is installed on the mounting base. The spray pipe has a communication port that communicates with the water inlet pipe. The pipe wall of the spray pipe is provided with multiple nozzles. A rotary drive unit for driving the spray pipe to rotate when the water inlet pipe moves up and down.

[0008] Furthermore, a cylinder is vertically installed on the top of the spray chamber, and a floating frame is fixedly sleeved on the upper end of the water inlet pipe. The floating frame is drivenly connected to the cylinder rod of the cylinder.

[0009] Furthermore, the telescopic unit includes a fixed cylinder vertically fixed to one end of the air inlet pipe that enters the spray chamber, a sliding tube that can slide freely up and down is coaxially inserted through the fixed cylinder, the upper end of the sliding tube extends out of the fixed cylinder and is connected to multiple exhaust pipes, and a connecting hole for installing the sliding tube is provided inside the fixed cylinder.

[0010] Furthermore, the lower end of the sliding tube is coaxially provided with an annular protrusion that is turned outward. The annular protrusion engages within the communicating hole and can slide freely up and down.

[0011] Furthermore, the rotary drive unit includes a gear coaxially fixed to the end of the spray pipe, and a rack is provided on the top of the spray chamber, the rack meshing externally with the gear.

[0012] Furthermore, the gears are provided in two parts and are respectively located at both ends of the spray pipe.

[0013] Furthermore, a drain pipe is provided at the lower end of the spray chamber, and the drain pipe is equipped with a valve.

[0014] Furthermore, a hollow cylinder is vertically fixed to the bottom surface of the mounting base, and a rotating column is vertically rotatably connected to the upper surface of the filter plate. The rotating column can freely pass into the hollow cylinder. Two balls are rotatably embedded in the upper end of the rotating column along its axial direction. Two spiral rolling grooves are opened in the inner wall of the hollow cylinder for the two balls to engage. The balls can roll freely in the spiral rolling grooves. Two horizontal arms are fixed to the lower end of the rotating column. A connecting arm is vertically fixed to the horizontal arm. A scraper is fixed to the lower end of the connecting arm. The scraper abuts against the upper surface of the filter plate.

[0015] Furthermore, the scraper has a communicating cavity inside, and the bottom surface of the scraper has multiple nozzles that communicate with the communicating cavity. The lower end of the rotating column is coaxially fixed to a hollow sleeve with an open top. A piston is fixedly sleeved at the lower end of the hollow sleeve. The piston is engaged with the hollow sleeve and can slide freely up and down. The lower outer wall of the hollow sleeve has a first pipe interface, and the surface of the scraper has a second pipe interface. The first pipe interface and the second pipe interface are connected to an air pipe, which communicates with the communicating cavity and the interior of the hollow sleeve.

[0016] An NMP waste liquid recovery process, which uses the aforementioned NMP waste liquid recovery equipment, includes the following recovery process: NMP exhaust gas is introduced into the air inlet chamber of the spray chamber through the air inlet pipe, and then into the connecting hole of the fixed cylinder. The NMP exhaust gas then enters multiple exhaust pipes through the inside of the sliding pipe, and is discharged into the air inlet chamber through multiple exhaust ports. The NMP exhaust gas then passes through the filter holes on the filter plate and enters the spray chamber. An external water pump is started and sprays water through the pipeline to the water inlet pipe, and then enters the connecting port through the mounting base, and then enters the inside of the spray pipe, and is sprayed out from multiple nozzles. When the cylinder is activated, the cylinder rod reciprocates, causing the floating frame to move up and down. This causes the floating frame to slide the air inlet pipe up and down within the spray chamber, which in turn causes the spray pipe to move up and down. As the spray pipe moves up and down, the gear meshes with the rack and pinion, causing them to rotate. This rotation drives the spray pipe to rotate while moving up and down, allowing the spray water from the nozzle to spray onto the inner top wall of the spray chamber. Simultaneously, when the mounting base moves up and down, it will cause the hollow cylinder and the rotating column to move relative to each other, thereby causing the balls on the rotating column to roll in the spiral rolling groove of the hollow cylinder. During the rolling process, the rotating column will be driven to rotate. When the rotating column rotates, it will drive the cross arm to rotate around the axial direction of the hollow cylinder, thereby enabling the scraper to remove the water accumulated on the upper surface of the filter plate. At the same time, when the rotating column moves up and down relative to the hollow cylinder, the piston will move inside the hollow sleeve. When the piston slides downward, it will squeeze the air inside the hollow sleeve and squeeze the air into the air pipe, and then enter the communicating cavity of the scraper. It will be blown onto the filter plate from the multiple nozzles to remove the water accumulated in the filter plate pores. After the NMP exhaust gas enters the spray chamber, the spray water will dissolve the NMP exhaust gas. The NMP solution formed by the dissolution will flow from the filter plate pores into the air inlet chamber and accumulate. As the level of the accumulated NMP solution rises, the airbag will come into contact with the NMP solution, and as the level rises, the airbag will drive the sliding tube to slide upwards, thereby driving the multiple exhaust pipes to move upwards.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting up an airbag and a telescopic unit, when spray water accumulates in the air inlet chamber, as the liquid level rises, the airbag will drive the telescopic unit and the exhaust pipe to move upward, thus preventing the exhaust port on the exhaust pipe from being submerged by the spray water, which would otherwise cause the spray water to flow out from the exhaust port. The present invention moves the water inlet pipe up and down, and drives the spray pipe to rotate while moving up and down through the rotation drive unit, so that the mouths of multiple nozzles on the spray pipe can face the inner top wall of the spray chamber, thereby reducing the spray blind zone of the nozzles. This invention uses the up-and-down movement of the water inlet pipe to cause relative longitudinal movement between the hollow cylinder and the hollow sleeve. This causes the balls on the rotating column to roll in the spiral rolling grooves on the inner wall of the hollow cylinder. As the balls roll in the spiral rolling grooves, they drive the hollow sleeve and the rotating column to move. When the rotating column rotates, it can drive the horizontal arm and the scraper to move horizontally, so that the scraper can clean the water accumulated on the surface of the filter plate. This prevents the NMP exhaust gas from being unable to smoothly enter the spray chamber from the filter holes of the filter plate due to the formation of a liquid tension film on the surface of the filter plate by the sprayed water. This invention utilizes the relative longitudinal movement of the hollow cylinder and the hollow sleeve to cause the piston to move within the hollow sleeve, thereby compressing the air within the hollow sleeve into the air pipe and into the communicating cavity of the scraper. Finally, the air is blown onto the surface of the filter plate through the nozzle, thus enabling the blowing treatment of water accumulated in the filter holes of the filter plate, further reducing the impact of water accumulation on the efficiency of NMP exhaust gas passing through the filter holes of the filter plate. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the overall structure of an NMP waste liquid recovery device according to the present invention; Figure 2 for Figure 1 The structural diagram omits the spray chamber, exhaust pipe, airbag, fixed cylinder, and air intake pipe. Figure 3 for Figure 2 Cross-sectional view of the middle structure; Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point A; Figure 5 for Figure 3 Enlarged schematic diagram of the local structure at point B; Figure 6 This is a schematic diagram of the structure of the exhaust pipe, airbag, fixed cylinder and intake pipe after assembly in this invention; Figure 7 for Figure 6 Cross-sectional view of the structure.

[0019] The following are explanations of the reference numerals in the figures: 1. Drain pipe; 2. Spray chamber; 3. Exhaust pipe; 4. Air inlet chamber; 5. Spray chamber; 6. Hollow sleeve; 7. Hollow cylinder; 8. Mounting base; 9. Cylinder; 10. Floating frame; 11. Water inlet pipe; 12. Spray pipe; 13. Spray head; 14. Rack and pinion; 15. Filter hole; 16. Scraper; 17. Filter plate; 18. Exhaust port; 19. Airbag; 20. Fixed cylinder; 21. Air inlet pipe; 22. Gear; 23. Piston; 24. Air pipe; 25. Cross arm; 26. Connecting chamber; 27. Nozzle; 28. Rotating column; 29. ​​Spiral rolling groove; 30. Connecting port; 31. Ball bearing; 32. Sliding tube; 33. Annular protrusion. Detailed Implementation

[0020] 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 those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-7This invention provides a technical solution: an NMP waste liquid recovery device, including an internally enclosed spray chamber 2. A filter plate 17 is coaxially welded inside the spray chamber 2, and multiple filter holes 15 are formed on the surface of the filter plate 17. The filter plate 17 divides the interior of the spray chamber 2 into a spray cavity 5 and an air inlet cavity 4 from top to bottom. An air inlet pipe 21 passes through the lower end of the spray chamber 2, with one end of the air inlet pipe 21 located outside the spray chamber 2 and connected to an external NMP waste gas delivery pump via a pipeline. A fixed cylinder 20 is vertically welded to the end of the air inlet pipe 21 that enters the spray chamber 2, and a sliding tube that can slide freely up and down passes through the fixed cylinder 20. 32. The upper end of the sliding tube 32 extends out of the fixed cylinder 20 and is connected to two exhaust pipes 3. The fixed cylinder 20 has a connecting hole for the installation of the sliding tube 32. The lower end of the sliding tube 32 is coaxially provided with an annular protrusion 33 that is turned outward. The annular protrusion 33 is engaged in the connecting hole and can slide freely up and down. The exhaust pipe 3 has multiple exhaust ports 18. One end of the sliding tube 32 that extends out of the fixed cylinder 20 is fixedly sleeved with an airbag 19. The airbag 19 is located below the exhaust pipe 3. The up and down movement of the airbag 19 can synchronously drive the exhaust pipe 3 to move up and down, and at the same time drive the sliding tube 32 to slide up and down in the fixed cylinder 20. A water inlet pipe 11, which can slide freely up and down, is vertically inserted through the top of the spray chamber 2. The upper end of the water inlet pipe 11 extends out of the spray chamber 2 and is connected to an external spray water delivery pump through a pipeline. One end of the water inlet pipe 11 that enters the spray chamber 5 is fixedly connected to a mounting base 8. A spray pipe 12, which can rotate freely, passes through the mounting base 8. That is, the mounting base 8 has a horizontally opened insertion hole for the spray pipe 12 to be inserted. The diameter of the insertion hole is larger than the outer diameter of the spray pipe 12. In addition, bearings are embedded at both ends of the insertion hole. The pipe 12 is inserted into the bearing, allowing the spray pipe 12 to rotate freely on the mounting base 8. The spray pipe 12 has a connecting port 30 that communicates with the water inlet pipe 11. Multiple nozzles 13 are provided on the pipe wall of the spray pipe 12. The water inlet pipe 11, the connecting port 30, the spray pipe 12, and the nozzles 13 are in a continuous connection. An external spray water pump delivers spray water to the water inlet pipe 11, and then through the connecting port 30 to the spray pipe 12, where it is sprayed by the multiple nozzles 13. The water inlet pipe 11 exits into the spray chamber 5. A cylinder 9 is vertically mounted on the top of the spray chamber 2. A floating frame 10 is fixedly sleeved at the upper end of the water inlet pipe 11. The floating frame 10 is welded to the cylinder rod of the cylinder 9. Additionally, gears 22 are coaxially welded to both ends of the spray pipe 12. A rack and pinion rod 14 passes through the top of the spray chamber 2, meshing externally with the gears 22. Upon activation of the cylinder 9, the cylinder rod of the cylinder 9 reciprocates, extending and retracting, causing the water inlet pipe 11 to slide up and down within the spray chamber 2. During this up-and-down sliding motion... The synchronous drive of the mounting base 8 to move up and down causes the spray pipe 12 to move up and down, and causes the gear 22 to mesh and rotate with the rack 14. When meshing and rotating, the gear 22 will rotate and drive the spray pipe 12 to rotate. In this way, the spray pipe 12 can move up and down and rotate in the spray chamber 5. This makes the spraying area of ​​the nozzle 13 on the spray pipe 12 larger and can spray the area above the nozzle 13, reducing the spray blind zone.

[0022] A hollow cylinder 7 is vertically fixed to the bottom surface of the mounting base 8. A rotating column 28 is vertically rotatably connected to the upper surface of the filter plate 17. The rotating column 28 can freely pass into the hollow cylinder 7. Two balls 31 are rotatably embedded in the upper end of the rotating column 28 along its axial direction. The rotating column 28 has a hemispherical groove in which the balls 31 are embedded and can rotate freely. Two spiral rolling grooves 29 are opened on the inner wall of the hollow cylinder 7 for the two balls 31 to engage. The balls 31 can roll freely in the spiral rolling grooves 29. Two horizontal arms 25 are fixed to the lower end of the rotating column 28. A connecting arm is vertically fixed to the horizontal arm 25. A scraper 16 is fixed to the lower end of the connecting arm. The scraper 16 abuts against the upper surface of the filter plate 17. A communicating cavity 26 is opened inside the scraper 16. Multiple nozzles 27 communicating with the communicating cavity 26 are opened on the bottom surface of the scraper 16. A hollow sleeve 6 with an open top is coaxially fixed to the lower end of the rotating column 28. A piston 23 is fixedly sleeved to the lower end of the hollow cylinder 7. The piston 23 is engaged with the hollow sleeve 6 and can slide freely up and down. A first pipe interface is provided on the lower outer wall of the hollow sleeve 6. A second pipe interface is provided on the surface of the scraper 16. The inlet and the second pipe interface are connected to an air pipe 24, which is connected to the connecting cavity 26 and the interior of the hollow sleeve 6. When the mounting base 8 moves up and down, it will cause the hollow cylinder 7 and the rotating column 28 to move relative to each other, thereby causing the balls 31 on the rotating column 28 to roll in the spiral rolling groove 29 of the hollow cylinder 7. During the rolling process, the rotating column 28 will be driven to rotate. When the rotating column 28 rotates, it will drive the cross arm 25 to rotate around the axis of the hollow cylinder 7, thereby enabling the scraper 16 to remove the water accumulated on the upper surface of the filter plate 17. Simultaneously, the hollow cylinder 7 As the rotating column 28 moves up and down, the piston 23 moves inside the hollow sleeve 6. When the piston 23 slides downward, it squeezes the air inside the hollow sleeve 6 and compresses the air into the air pipe 24, which then enters the communicating cavity 26 of the scraper 16 and is blown onto the filter plate 17 from multiple nozzles 27 to remove the water accumulated in the filter holes 15 of the filter plate 17. In addition, when the piston 23 slides upward, the ball 31 rolls from bottom to top in the spiral rolling groove 29 and drives the rotating column 28 to rotate in the opposite direction, so that the scraper 16 continues to treat the water accumulated on the surface of the filter plate 17.

[0023] The working principle of this invention is as follows: An external gas delivery pump introduces NMP exhaust gas into the air inlet chamber 4 of the spray chamber 2 through the air inlet pipe 21, and then into the connecting hole of the fixed cylinder 20. The NMP exhaust gas then enters multiple exhaust pipes 3 through the inside of the sliding pipe 32, and is discharged into the air inlet chamber 4 through multiple exhaust ports 18. The NMP exhaust gas then passes through the filter holes 15 on the filter plate 17 and enters the spray chamber 5. An external water pump is started and the spray water is transported to the water inlet pipe 11 through the pipeline, and then enters the connecting port 30 through the mounting base 8, and then enters the inside of the spray pipe 12, and is sprayed out from multiple nozzles 13. When cylinder 9 is activated, the cylinder rod of cylinder 9 reciprocates, causing the floating frame 10 to move up and down. This causes the floating frame 10 to slide the water inlet pipe 11 up and down within the spray chamber 2, which in turn causes the spray pipe 12 to move up and down. As the spray pipe 12 moves up and down, the gear 22 meshes with the rack 14 and rotates. As the gear 22 meshes with the rack 14 and rotates, the spray pipe 12 can be driven to rotate while moving up and down. This allows the spray water from the nozzle 13 to spray onto the inner top wall of the spray chamber 5. Simultaneously, as the mounting base 8 moves up and down, it causes the hollow cylinder 7 and the rotating column 28 to move relative to each other. This causes the balls 31 on the rotating column 28 to roll within the spiral rolling groove 29 of the hollow cylinder 7. During this rolling process, the rotating column 28 rotates. As the rotating column 28 rotates, it causes the horizontal arm 25 to rotate around the axial direction of the hollow cylinder 7. This allows the scraper 16 to remove the accumulated water on the upper surface of the filter plate 17. Simultaneously, as the rotating column 28 moves up and down relative to the hollow cylinder 7... Piston 23 will move inside hollow sleeve 6. When piston 23 slides downward, it will squeeze the air inside hollow sleeve 6 and squeeze the air into air pipe 24, and then enter the communicating cavity 26 of scraper 16. It will be blown from multiple nozzles 27 onto filter plate 17 to remove the water accumulated in filter hole 15 of filter plate 17. After NMP exhaust gas enters spray chamber 5, it will be dissolved by spray water. The NMP solution formed by dissolution will flow from filter hole 15 of filter plate 17 into air inlet chamber 4 and accumulate. As the level of the accumulated NMP solution rises, the airbag 19 will come into contact with the NMP solution. As the level rises, the airbag 19 will drive the sliding tube 32 to slide upwards, thereby driving multiple exhaust pipes 3 to move upwards, preventing the exhaust ports 18 on the exhaust pipes 3 from being submerged by the spray water. The lower end of the spray chamber 2 is provided with a drain pipe 1, which is equipped with a valve. When the NMP solution and spray water in the air inlet chamber 4 accumulate to a certain level, the valve is opened, allowing the NMP solution and spray water to mix and be discharged from the drain pipe 1 into an external container for treatment.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. 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 variations 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 waste liquid recovery device, characterized in that, include: Spray chamber (2), a filter plate (17) is fixedly connected inside the spray chamber (2), the filter plate (17) divides the interior of the spray chamber (2) into a spray chamber (5) and an air inlet chamber (4) from top to bottom, an air inlet pipe (21) is provided at the lower end of the spray chamber (2), a telescopic unit is fixedly connected at one end of the air inlet pipe (21) that enters the spray chamber (2), the telescopic unit is connected to multiple exhaust pipes (3), the exhaust pipes (3) are provided with multiple exhaust ports (18), the telescopic unit is connected to an airbag (19), the airbag (19) is located below the exhaust pipes (3); A water inlet pipe (11) is vertically installed at the top of the spray chamber (2) and can slide freely up and down. One end of the water inlet pipe (11) is fixed to a mounting base (8) when it enters the spray chamber (5). A spray pipe (12) that can rotate freely is installed on the mounting base (8). The spray pipe (12) has a communication port (30) that communicates with the water inlet pipe (11). The pipe wall of the spray pipe (12) is provided with multiple nozzles (13). A rotary drive unit for driving the spray pipe (12) to rotate when the water inlet pipe (11) moves up and down; The telescopic unit includes a fixed cylinder (20) vertically fixed to one end of the air inlet pipe (21) that enters the spray chamber (2). The fixed cylinder (20) is coaxially provided with a sliding tube (32) that can slide freely up and down. The upper end of the sliding tube (32) extends out of the fixed cylinder (20) and is connected to multiple exhaust pipes (3). The fixed cylinder (20) has a connecting hole for the installation of the sliding tube (32). The up and down movement of the airbag (19) can synchronously drive the exhaust pipe (3) to move up and down, and at the same time drive the sliding tube (32) to slide up and down in the fixed cylinder (20).

2. The NMP waste liquid recovery equipment according to claim 1, characterized in that, A cylinder (9) is vertically installed on the top of the spray chamber (2), and a floating frame (10) is fixedly sleeved on the upper end of the water inlet pipe (11). The floating frame (10) is driven by the cylinder rod of the cylinder (9).

3. The NMP waste liquid recovery equipment according to claim 2, characterized in that, The lower end of the sliding tube (32) is coaxially provided with an annular protrusion (33) that is turned outward. The annular protrusion (33) is engaged in the communicating hole and can slide freely up and down.

4. The NMP waste liquid recovery equipment according to claim 3, characterized in that, The rotary drive unit includes a gear (22) coaxially fixed to the end of the spray pipe (12), and a rack (14) is provided on the top of the spray chamber (2), which meshes with the gear (22).

5. The NMP waste liquid recovery equipment according to claim 4, characterized in that, Two gears (22) are provided and are respectively located at both ends of the spray pipe (12).

6. The NMP waste liquid recovery equipment according to claim 5, characterized in that, The lower end of the spray chamber (2) is provided with a drain pipe (1), and the drain pipe (1) is provided with a valve.

7. The NMP waste liquid recovery equipment according to claim 6, characterized in that, The mounting base (8) is vertically fixed to a hollow cylinder (7) on its bottom surface. The filter plate (17) is vertically rotatably connected to a rotating column (28). The rotating column (28) can freely pass into the hollow cylinder (7). The upper end of the rotating column (28) is rotatably fitted with two balls (31) along its axial direction. The inner wall of the hollow cylinder (7) has two spiral rolling grooves (29) for the two balls (31) to engage. The balls (31) can roll freely in the spiral rolling grooves (29). The lower end of the rotating column (28) is fixed to two horizontal arms (25). The horizontal arms (25) are vertically fixed to a connecting arm. The lower end of the connecting arm is fixed to a scraper (16). The scraper (16) is in contact with the upper surface of the filter plate (17).

8. The NMP waste liquid recovery equipment according to claim 7, characterized in that, The scraper (16) has a communicating cavity (26) inside. The bottom surface of the scraper (16) has multiple nozzles (27) that communicate with the communicating cavity (26). The lower end of the rotating column (28) is coaxially fixed with a hollow sleeve (6) with an open top. The lower end of the hollow cylinder (7) is fixedly fitted with a piston (23). The piston (23) is engaged with the hollow sleeve (6) and can slide freely up and down. The lower outer wall of the hollow sleeve (6) is provided with a first pipe interface. The surface of the scraper (16) is provided with a second pipe interface. The first pipe interface and the second pipe interface are connected to an air pipe (24). The air pipe (24) communicates with the communicating cavity (26) and the interior of the hollow sleeve (6).

9. A process for recovering NMP waste liquid, characterized in that, It uses the NMP waste liquid recovery equipment described in claim 8, and its recovery process includes: NMP exhaust gas is introduced into the air inlet chamber (4) of the spray chamber (2) through the air inlet pipe (21), and then into the connecting hole of the fixed cylinder (20). Then, the NMP exhaust gas enters multiple exhaust pipes (3) through the inside of the sliding pipe (32), and is discharged into the air inlet chamber (4) through multiple exhaust ports (18). Then, the NMP exhaust gas passes through the filter holes (15) on the filter plate (17) and enters the spray chamber (5). The external water pump is started and the spray water is transported to the water inlet pipe (11) through the pipeline. Then, it enters the connecting port (30) through the mounting base (8), and then enters the inside of the spray pipe (12), and is sprayed out from multiple nozzles (13). When the cylinder (9) is started, the cylinder rod of the cylinder (9) reciprocates and extends, and drives the floating frame (10) to move up and down. This causes the floating frame (10) to drive the air inlet pipe (21) to slide up and down in the spray chamber (2), thereby driving the spray pipe (12) to move up and down. When the spray pipe (12) moves up and down, the gear (22) meshes with the rack (14) and rotates. As the gear (22) meshes with the rack (14) and rotates, the spray pipe (12) can be driven to rotate while moving up and down. This allows the spray water sprayed by the nozzle (13) to spray towards the inner top wall of the spray chamber (5). Simultaneously, when the mounting base (8) moves up and down, it will cause the hollow cylinder (7) and the rotating column (28) to move relative to each other, thereby causing the balls (31) on the rotating column (28) to roll in the spiral rolling groove (29) of the hollow cylinder (7). During the rolling process, the rotating column (28) will be driven to rotate. When the rotating column (28) rotates, it will drive the cross arm (25) to rotate around the axial direction of the hollow cylinder (7), thereby enabling the scraper (16) to remove the water accumulated on the upper surface of the filter plate (17). At the same time, the rotating column (28) moves up and down relative to the hollow cylinder (7). When the piston (23) moves inside the hollow sleeve (6), when the piston (23) slides downward, it will squeeze the air inside the hollow sleeve (6) and squeeze the air into the air pipe (24), and then enter the communicating cavity (26) of the scraper (16), and blow it from the multiple nozzles (27) onto the filter plate (17) to remove the water accumulated in the filter holes (15) of the filter plate (17). After the NMP exhaust gas enters the spray chamber (5), the NMP exhaust gas is dissolved by the spray water. The NMP solution formed by the dissolution will flow from the filter holes (15) of the filter plate (17) into the air inlet chamber (4) and accumulate. As the level of the accumulated NMP solution rises, the airbag (19) will come into contact with the NMP solution, and as the level rises, the airbag (19) will drive the sliding tube (32) to slide upward, thereby driving the multiple exhaust pipes (3) to move upward.

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