NMP (N-Methyl Pyrrolidone) solvent filtering and recycling device in high-vacuum state

Abstract

The invention discloses an NMP solvent filtering and recycling device in a high vacuum state. The NMP solvent filtering and recycling device comprises a recycling machine body, an exhaust pipe is fixedly installed at the top end of the recycling machine body, a control panel is fixedly installed at one end of the recycling machine body, a liquid discharging pipe is fixedly installed at one end of the recycling machine body, and a filtering cabinet for filtering is fixedly installed at one end of the recycling machine body; a liquid inlet pipe is fixedly mounted at the top end of the filtering cabinet, a feeding pipe penetrating through the recycling machine body is fixedly mounted in the filtering cabinet, sliding clamping bases are symmetrically and fixedly mounted in the filtering cabinet, a fixing plate is slidably clamped to the middles of the two sliding clamping bases, and a filtering plate for filtering is slidably connected into the fixing plate; clamping sliding blocks I which are clamped with the sliding clamping seats in a sliding manner are symmetrically and fixedly mounted at the two ends of the fixed plate; the NMP solvent is directly filtered through the filter plate in the filter cabinet, solid particle impurities in the NMP solvent can be effectively removed, and the purity of the recovered solvent is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of NMP solvent recovery, and particularly to an NMP solvent filtration and recovery device under a high vacuum state. Background Art

[0002] N-methyl pyrrolidone, 1-methyl-2-pyrrolidone, abbreviated as NMP, has the advantages of high flash point, good safety, and good dissolution and dilution performance for the binder PDVF, so it is commonly used in lithium-ion batteries. It is the main component of the waste gas discharged during the production of lithium-ion batteries, with a content of 0.06% - 0.5%. In Germany, N-methyl pyrrolidone is designated as a third-class hazardous substance, and the German Environmental Protection Agency stipulates that its emission concentration is 100 * 10-6.

[0003] According to a new NMP solvent recovery machine disclosed in the patent publication number CN205109332U, which includes an air inlet, a water layer, a gas-liquid separator, a liquid distributor, a recovery machine body, an exhaust port, an NMP on-line concentration detector, and a CPU. The bottom of the recovery machine body is provided with a water layer, one side of the water layer is provided with an air inlet, a gas-liquid separator is arranged above the water layer, a liquid distributor is installed above the gas-liquid separator, exhaust ports are arranged around the upper end of the recovery machine body, an NMP on-line concentration detector is installed at the bottom inside the recovery machine body, a pressure detector is installed at the top inside the recovery machine body, the output ends of the NMP on-line concentration detector and the pressure detector are electrically connected to the input end of the CPU, and the output end of the CPU is respectively electrically connected to the input ends of a touch operation screen and an alarm. The utility model not only has a high recovery efficiency, with a recovery rate of over 95%, but also occupies a small space, has a long service life, low cost, and is convenient for maintenance.

[0004] The above device can efficiently recover the NMP solvent by setting a water layer, a gas-liquid separation layer, and a liquid separation layer inside the recovery machine. However, since NMP may mix with dust in the air and metal particles generated by equipment wear during use, directly recovering it will reduce the purity of the recovered NMP solvent and cannot meet the process requirements with higher purity requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide an NMP solvent filtration and recovery device under a high vacuum state to solve the problem that the above device can efficiently recover the NMP solvent by setting a water layer, a gas-liquid separation layer, and a liquid separation layer inside the recovery machine. However, since NMP may mix with dust in the air and metal particles generated by equipment wear during use, directly recovering it will reduce the purity of the recovered NMP solvent and cannot meet the process requirements with higher purity requirements.

[0006] To achieve the above object, the present invention provides the following technical solution: An NMP solvent filtration and recovery device under high vacuum conditions, including a recovery body, an exhaust pipe is fixedly installed at the top end of the recovery body, a control panel is fixedly installed at one end of the recovery body, a drain pipe is fixedly installed at one end of the recovery body, a filtration cabinet for filtration is fixedly installed at one end of the recovery body, and a liquid inlet pipe is fixedly installed at the top end of the filtration cabinet. A feed pipe communicating with the recovery body is fixedly installed inside the filtration cabinet. Sliding card seats are symmetrically and fixedly installed inside the filtration cabinet, and a fixing plate is slidably clamped in the middle of the two groups of sliding card seats. A filter plate for filtration is slidably connected inside the fixing plate. At both ends of the fixing plate, clamping sliders one slidably clamped with the sliding card seats are symmetrically and fixedly installed. At both ends of the filter plate, clamping sliders two slidably connected with the fixing plate are symmetrically and fixedly installed. A sealed cabinet door is rotatably connected to one end of the filtration cabinet.

[0007] As a further scheme of the present invention: A collection groove for precipitating solid particle impurities is opened at the top end of the fixing plate, and the collection grooves are symmetrically opened at the top end of the fixing plate.

[0008] As a further scheme of the present invention: A cleaning plate for cleaning is slidably connected inside the collection groove, and a push rod for facilitating pushing is fixedly installed at the top end of the cleaning plate. Sliding grooves for the cleaning plate to slide are symmetrically opened inside the collection groove, and sliding blocks slidably adapted to the sliding grooves are symmetrically and fixedly installed at both ends of the cleaning plate.

[0009] As a further scheme of the present invention: Extension plates are symmetrically and fixedly installed at the top end of the cleaning plate, and limiting grooves for limiting are symmetrically opened at both sides of the top end of the collection groove and the two groups of extension plates. Limiting rods for limiting are inserted at the top end of the limiting grooves.

[0010] As a further scheme of the present invention: Installation plates are symmetrically and slidably connected inside the filtration cabinet and located at the top of the filter plate, and cleaning brushes for reducing blockage of the filter plate are symmetrically arranged in the middle of the installation plates.

[0011] As a further scheme of the present invention: Empty grooves are symmetrically opened at the top end of the installation plate, and L-shaped limiting blocks for limiting are rotatably connected inside the empty grooves. L-shaped blocks fixedly limited with the L-shaped limiting blocks are symmetrically and fixedly installed at both ends of the cleaning brush, and limiting grooves adapted to the L-shaped limiting blocks are opened at one end of the L-shaped blocks.

[0012] As a further scheme of the present invention: A reset spring is fixedly installed at the bottom end of the L-shaped limiting block inside the empty groove, and a pressing block for driving the L-shaped limiting block to slide is slidably connected inside the empty groove.

[0013] As a further solution of the present invention: a pushing block is arranged inside the empty slot and at the bottom end of the L-shaped block, and a connecting spring fixedly installed with the bottom end of the pushing block is fixedly installed inside the empty slot.

[0014] As a further solution of the present invention: a cavity is formed at one end of the filter cabinet, and one end of the mounting plate penetrates through the filter cabinet and a connecting plate is fixedly installed inside the cavity. Fixed seats are symmetrically and fixedly installed inside the cavity, and guide rods are symmetrically and fixedly installed in the middle of the fixed seats. A sliding seat is slidably connected in the middle of the two groups of fixed seats. One end of the sliding seat is fixedly installed with a driving plate slidably connected to one end of the fixed seat, and the driving plate penetrates through the fixed seat and a connecting block is fixedly installed in the middle of the connecting plate. One end of the fixed seat is rotatably connected with a driving eccentric gear, and one end of the sliding seat is rotatably connected with a driven eccentric gear meshed with the driving eccentric gear. A connecting arm is rotatably connected at the centers of the driving eccentric gear and the driven eccentric gear. A rotating motor is fixedly installed at one end of the filter cabinet, and the output shaft end of the rotating motor penetrates through the filter cabinet and is fixedly installed with one end of the fixed seat and the driving eccentric gear.

[0015] As a further solution of the present invention: an inclined panel facilitating the discharge of materials is fixedly installed inside the filter cabinet and at one end of the feed pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the present invention, the NMP solvent is directly filtered by the filter plate inside the filter cabinet, which can effectively remove the solid particle impurities therein and improve the purity of the recycled solvent;

[0018] In the present invention, the automatic cleaning of the filter plate by the cleaning brush is realized by using the rotating motor and a series of transmission mechanisms, without frequent manual intervention, which improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

[0020] Figure 2 is the side structural schematic diagram of the recycling body in the present invention;

[0021] Figure 3 is the opened structural schematic diagram of the filter cabinet and the sealing cabinet door in the present invention;

[0022] Figure 4 is the sectional structural schematic diagram of the filter cabinet in the present invention;

[0023] Figure 5 is the present invention Figure 4 the partial enlarged structural schematic diagram at A in;

[0024] Figure 6It is a partial sectional structure schematic diagram of the mounting plate and the L-shaped block in the present invention;

[0025] Figure 7 It is a sectional structure schematic diagram of the internal cavity of the filter cabinet in the present invention;

[0026] Figure 8 It is a partial structure schematic diagram of the sliding seat and the fixed seat in the present invention.

[0027] In the figure: 1, recycling body; 2, filter cabinet; 3, liquid inlet pipe; 4, liquid discharge pipe; 5, control panel; 6, exhaust pipe; 7, feed pipe; 8, sealing cabinet door; 9, sliding clamping seat; 10, fixing plate; 11, clamping slider one; 12, filter plate; 13, clamping slider two; 14, collection tank; 15, cleaning plate; 16, push rod; 17, chute; 18, sliding block; 19, extension plate; 20, limit groove; 21, limit rod; 22, mounting plate; 23, cleaning brush; 24, L-shaped block; 25, limit groove; 26, L-shaped limit block; 27, return spring; 28, push-out block; 29, connecting spring; 30, pressing block; 31, empty groove; 32, cavity; 33, connecting plate; 34, fixed seat; 35, guide rod; 36, sliding seat; 37, driving plate; 38, connecting block; 39, active eccentric gear; 40, driven eccentric gear; 41, connecting arm; 42, rotating motor; 43, inclined panel. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The following describes the embodiments according to the overall structure of the present invention.

[0030] Referring to Figures 1 to 8 , in an embodiment of the present invention, a device for filtering and recycling NMP solvent under a high vacuum state includes a recycling body 1. An exhaust pipe 6 is fixedly installed at the top end of the recycling body 1. A control panel 5 is fixedly installed at one end of the recycling body 1. A drain pipe 4 is fixedly installed at one end of the recycling body 1. A filter cabinet 2 for filtering is fixedly installed at one end of the recycling body 1. An inlet pipe 3 is fixedly installed at the top end of the filter cabinet 2. A feed pipe 7 communicating with the recycling body 1 is fixedly installed inside the filter cabinet 2. Sliding chucks 9 are symmetrically and fixedly installed inside the filter cabinet 2. A fixing plate 10 is slidably clamped in the middle of the two groups of sliding chucks 9. A filter plate 12 for filtering is slidably connected inside the fixing plate 10. Clamping sliders one 11 slidably clamped with the sliding chucks 9 are symmetrically and fixedly installed at both ends of the fixing plate 10. Clamping sliders two 13 slidably connected with the fixing plate 10 are symmetrically and fixedly installed at both ends of the filter plate 12. A sealed cabinet door 8 is rotatably connected to one end of the filter cabinet 2.

[0031] Adopting the above scheme: A water layer is arranged at the bottommost layer inside the recycling body 1, a liquid distributor is arranged at the topmost layer, and a gas-liquid separation layer is arranged in the middle. The filter cabinet 2 is connected to the recycling body 1. The inlet pipe 3 allows the solvent to be treated to flow in, and the feed pipe 7 guides the filtered solvent into the recycling body 1. The sliding chucks 9 and the clamping sliders one 11 cooperate to enable the fixing plate 10 to be flexibly withdrawn, facilitating maintenance; the filter plate 12 is slidably connected to the fixing plate 10 through the clamping sliders two 13 inside the fixing plate 10, facilitating the replacement of the filter plate 12. The sealed cabinet door 8 facilitates the inspection and cleaning of the inside of the filter cabinet 2. The filter assembly can be flexibly disassembled, the filter plate 12 can be quickly replaced, reducing the downtime; the sealed cabinet door 8 ensures the airtightness of the device and improves the working safety.

[0032] Referring to Figures 1 to 8 , a collection groove 14 for precipitating solid particle impurities is provided at the top end of the fixing plate 10, and the collection groove 14 is symmetrically provided at the top end of the fixing plate 10. A cleaning plate 15 for cleaning is slidably connected inside the collection groove 14, and a pushing rod 16 for facilitating pushing is fixedly installed at the top end of the cleaning plate 15. Slide grooves 17 for the cleaning plate 15 to slide are symmetrically provided inside the collection groove 14, and sliding blocks 18 slidably adapted to the slide grooves 17 are symmetrically and fixedly installed at both ends of the cleaning plate 15. Extension plates 19 are symmetrically and fixedly installed at the top end of the cleaning plate 15, and limiting grooves 20 for limiting are symmetrically provided on both sides of the top end of the collection groove 14 and the two groups of extension plates 19. A limiting rod 21 for limiting is inserted into the top end of the limiting groove 20;

[0033] With the above solution: The two sides of the fixing plate 10 near the collection groove 14 are inclined plates for facilitating the cleaning brush 23 to clean the impurities into the collection groove 14. The collection groove 14 is in the shape of a long strip-shaped groove structure for precipitating the solid particle impurities intercepted during the filtration process. The cleaning plate 15 inside the collection groove 14 has a moderate thickness, closely fits the groove body, and the pushing rod 16 welded on the plate adopts an ergonomic grip design, which is convenient for operation. The slide grooves 17 symmetrically provided on both side walls of the collection groove 14 have a depth and width adapted to the sliding blocks 18 at both ends of the cleaning plate 15 to ensure smooth sliding. The extension plates 19 at the top end of the cleaning plate 15 are made of strong materials and are accurately corresponding to the limiting grooves 20 on both sides of the top end of the collection groove 14. The limiting rod 21 is made of stainless steel and can effectively fix the cleaning plate 15 after being inserted into the limiting groove 20. The collection groove 14 is convenient for centralized collection of impurities to avoid secondary pollution. The cleaning plate 15 cooperates with the pushing rod 16 to make the cleaning work easy and efficient. The combination of the slide grooves 17 and the sliding blocks 18, the extension plates 19 and the limiting grooves 20 and the limiting rods 21 ensures the stable operation of the cleaning plate 15 and improves the overall operation reliability of the equipment.

[0034] Referring to Figures 1 to 8, inside the filter cabinet 2 and symmetrically slidably connected to the top of the filter plate 12 is the mounting plate 22, and in the middle of the mounting plate 22 are symmetrically arranged cleaning brushes 23 for reducing blockage of the filter plate 12. One end of the filter cabinet 2 is provided with a cavity 32. One end of the mounting plate 22 penetrates through the filter cabinet 2 and is fixedly installed with a connecting plate 33 inside the cavity 32. Inside the cavity 32 are symmetrically and fixedly installed fixed seats 34, and in the middle of the fixed seats 34 are symmetrically and fixedly installed guide rods 35. A sliding seat 36 is slidably connected to the middle of the two groups of fixed seats 34. One end of the sliding seat 36 is fixedly installed with a driving plate 37 slidably connected to one end of the fixed seat 34, and the driving plate 37 penetrates through the fixed seat 34 and is fixedly installed with a connecting block 38 in the middle of the connecting plate 33. One end of the fixed seat 34 is rotatably connected to a driving eccentric gear 39, and one end of the sliding seat 36 is rotatably connected to a driven eccentric gear 40 meshing with the driving eccentric gear 39. A connecting arm 41 is rotatably connected to the centers of the driving eccentric gear 39 and the driven eccentric gear 40. One end of the filter cabinet 2 is fixedly installed with a rotating motor 42, and the output shaft end of the rotating motor 42 penetrates through the filter cabinet 2 and is fixedly installed with one end of the fixed seat 34 and the driving eccentric gear 39;

[0035] Adopting the above solution: Inside the filter cabinet 2, the mounting plates 22 are symmetrically distributed at the top of the filter plate 12. They are made of high-strength aluminum alloy, light in texture and durable. They are smoothly slidably connected to the inner wall of the filter cabinet 2 through special rails. The cleaning brushes 23 symmetrically installed in the middle of the mounting plate 22 are made of soft and tough nylon bristles, which can effectively clean impurities without damaging the filter plate 12. The cavity 32 opened at one end of the filter cabinet 2 has a compact and reasonable internal layout. The fixed seats 34 are firmly fixed inside the cavity 32. The surface of the guide rods 35 in the middle is precisely polished to ensure the smooth sliding of the sliding seat 36 along it. The rotating motor 42 is fixed at one end of the filter cabinet 2. After starting, its output shaft drives the driving eccentric gear 39 to rotate, drives the driven eccentric gear 40 through the connecting arm 41, and then drives the sliding seat 36 to drive the mounting plate 22 and the cleaning brushes 23 to reciprocate. The reciprocating movement of the cleaning brushes 23 reduces the manual maintenance workload, improves the cleaning efficiency of the filter plate 12, effectively reduces the risk of blockage, ensures the long-term stable operation of the equipment, and improves the overall NMP solvent filtration and recovery efficiency.

[0036] Refer to Figures 1 to 8, empty slots 31 are symmetrically formed at the top end of the mounting plate 22, and an L-shaped limiting block 26 for limiting is rotatably connected inside the empty slot 31. L-shaped blocks 24 which are limited and fixed to the L-shaped limiting block 26 are symmetrically and fixedly installed at both ends of the cleaning brush 23, and a limiting groove 25 adapted to the L-shaped limiting block 26 is formed at one end of the L-shaped block 24. A return spring 27 is fixedly installed inside the empty slot 31 and at the bottom end of the L-shaped limiting block 26. A pressing block 30 which drives the L-shaped limiting block 26 to slide is slidably connected inside the empty slot 31. A pushing block 28 is arranged inside the empty slot 31 and at the bottom end of the L-shaped block 24, and a connecting spring 29 fixedly installed with the bottom end of the pushing block 28 is fixedly installed inside the empty slot 31;

[0037] Adopting the above solution: When installing the cleaning brush 23, only need to insert the L-shaped blocks 24 at both ends of the cleaning brush 23 into the empty slots 31. At this time, press the pressing block 30 to drive the L-shaped limiting block 26 to rotate. When the L-shaped block 24 is completely inserted into the empty slot 31 and contacts the pushing block 28, release the pressing block 30, and the return spring 27 will automatically rotate one end of the L-shaped limiting block 26 into the limiting groove 25 for limiting and fixing. The empty slots 31 at the top end of the mounting plate 22 are in a regular rectangular shape, and the L-shaped limiting blocks 26 inside are flexibly rotated through delicate rotating shafts. The limiting grooves 25 of the L-shaped blocks 24 at both ends of the cleaning brush 23 are closely fitted with the L-shaped limiting blocks 26. Under the action of the return spring 27, the L-shaped limiting block 26 can stably limit the L-shaped block 24. The pressing block 30 is slidably adapted to the empty slot 31 and can conveniently control the L-shaped limiting block 26. The pushing block 28 is supported by the connecting spring 29 and can assist in the installation and disassembly of the cleaning brush 23. The advantage is that this structure is convenient for the installation, fixation and replacement of the cleaning brush 23, the operation is simple and efficient, and the convenience of equipment maintenance is effectively improved.

[0038] Refer to Figures 1 to 8 , an inclined panel 43 facilitating the discharge of materials is fixedly installed inside the filter cabinet 2 and at one end of the feed pipe 7;

[0039] Adopting the above solution: Through the inclined panel 43, the filtered NMP solvent can be quickly passed through the feed pipe 7 and enter the recycling cabinet 1 for recycling.

[0040] The working principle of the present invention is as follows: First, the NMP solvent enters the filtration cabinet 2 through the liquid inlet pipe 3. In the filtration cabinet 2, the solvent first passes through the filter plate 12. The filter plate 12 utilizes its own filtration function to intercept the solid particle impurities in the solvent. By directly filtering the NMP solvent through the filter plate 12, the solid particle impurities therein can be effectively removed, improving the purity of the recycled solvent. When filtering, the staff starts the rotating motor 42, and its output shaft drives the active eccentric gear 39 to rotate. The active eccentric gear 39 meshes with the driven eccentric gear 40. Since they are rotationally connected through the connecting arm 41 at their centers, the driven eccentric gear 40 also rotates accordingly. The rotation of the driven eccentric gear 40 drives the sliding seat 36 to slide on the guide rod 35. The sliding seat 36 drives the mounting plate 22 to slide in the filtration cabinet 2 through the driving plate 37, the connecting block 38, and the connecting plate 33. The cleaning brush 23 on the mounting plate 22 reciprocally cleans the filter plate 12, reducing the occurrence of blockage of the filter plate 12. The automatic cleaning of the filter plate 12 by the cleaning brush 23 is realized by using the rotating motor 42 and a series of transmission mechanisms, without frequent manual intervention, improving the work efficiency. When the filter plate 12 needs to be replaced, the sealing cabinet door 8 at one end of the filtration cabinet 2 is opened. Since the fixing plate 10 is slidably clamped with the sliding clamping seat 9 through the clamping slider one 11, and the filter plate 12 is slidably connected with the fixing plate 10 through the clamping slider two 13, the fixing plate 10 can be directly pulled out from the sliding clamping seat 9, and then the filter plate 12 can be pulled out from the fixing plate 10 for replacement. When cleaning the impurities inside the collection tank 14, the fixing plate is pulled out from the inside of the filtration cabinet 2 through the sliding clamping seat 9 and the clamping slider one 11. Then, the limiting rod 21 at the top of the collection tank 14 is pulled out to release the limit on the cleaning plate 15. By pushing the push rod 16, the cleaning plate 15 slides in the collection tank 14, and the sliding blocks 18 at both ends of the cleaning plate 15 slide in the sliding grooves 17, thereby pushing the solid particle impurities in the collection tank 14 out of the collection tank 14 to complete the cleaning work. After the cleaning is completed, the cleaning plate 15 is pushed back to its original position, and the limiting rod 21 is inserted for limiting. With the design of the cleaning plate 15 and the push rod 16, the impurities in the collection tank 14 can be easily cleaned out, avoiding the accumulation of impurities affecting the filtration effect. The design of the limiting rod 21 and the limiting groove 20 ensures the stability of the cleaning plate 15 when not in use, preventing it from moving during the filtration process and affecting the filtration effect.

[0041] The above-mentioned is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A NMP solvent filtering and recovery device under high vacuum state, comprising a recovery body (1), an exhaust pipe (6) fixedly installed at the top of the recovery body (1), a control panel (5) fixedly installed at one end of the recovery body (1), and a drain pipe (4) fixedly installed at one end of the recovery body (1), characterized in that: A filter cabinet (2) for filtering is fixedly installed at one end of the recovery body (1), and a liquid inlet pipe (3) is fixedly installed at the top of the filter cabinet (2). A feed pipe (7) which is installed through the recovery body (1) is fixedly installed inside the filter cabinet (2). A sliding clamp (9) is symmetrically fixedly installed inside the filter cabinet (2), and a fixed plate (10) is slidably clamped in the middle of two groups of sliding clamps (9). A filter plate (12) for filtering is slidably connected inside the fixed plate (10). A first clamping slide block (11) which is slidably clamped with the sliding clamp block (9) is symmetrically fixedly installed at both ends of the fixed plate (10). A second clamping slide block (13) which is slidably connected with the fixed plate (10) is symmetrically fixedly installed at both ends of the filter plate (12). A sealing cabinet door (8) is rotatably connected to one end of the filter cabinet (2).

2. The NMP solvent filtering and recovering device under a high vacuum state according to claim 1, characterized in that: A collecting groove (14) for solid particle impurities to precipitate is provided at the top of the fixed plate (10), and the collecting groove (14) is symmetrically arranged at the top of the fixed plate (10).

3. The NMP solvent filtering and recovering device under a high vacuum state according to claim 2, characterized in that: A cleaning plate (15) for cleaning is slidably connected inside the collecting trough (14), and a pushing rod (16) is fixedly installed on the top of the cleaning plate (15) for easy pushing. Slide grooves (17) for the cleaning plate (15) to slide are symmetrically opened inside the collecting trough (14), and sliding blocks (18) slidably adapted to the slide grooves (17) are symmetrically fixedly installed at both ends of the cleaning plate (15).

4. The NMP solvent filtering and recovering device under a high vacuum state according to claim 3, characterized in that: The top of the cleaning plate (15) is symmetrically fixed with an extension plate (19), and both sides of the top of the two groups of extension plates (19) and the collecting tank (14) are symmetrically provided with limiting grooves (20) for limiting, and the top of the limiting groove (20) is plugged with a limiting rod (21) for limiting.

5. The NMP solvent filtering and recovering device under a high vacuum state according to claim 4, characterized in that: A mounting plate (22) is symmetrically slidably connected inside the filter cabinet (2) and located at the top of the filter plate (12), and a cleaning brush (23) is symmetrically arranged in the middle of the mounting plate (22) to reduce clogging of the filter plate (12).

6. The NMP solvent filtering and recovery device under a high vacuum state according to claim 5, characterized in that: The top of the mounting plate (22) is symmetrically provided with an empty groove (31), and an L-shaped limiting block (26) is rotatably connected inside the empty groove (31) for limiting. L-shaped blocks (24) are symmetrically fixedly installed at both ends of the cleaning brush (23) for limiting the position of the L-shaped limiting block (26), and one end of the L-shaped block (24) is provided with a limiting groove (25) adapted to the L-shaped limiting block (26).

7. The NMP solvent filtering and recovery device under a high vacuum state according to claim 6, characterized in that: A return spring (27) is fixedly installed inside the empty slot (31) and at the bottom end of the L-shaped limit block (26). A pressing block (30) is slidably connected inside the empty slot (31) to drive the L-shaped limit block (26) to slide.

8. The NMP solvent filtering and recovery device under a high vacuum state according to claim 7, characterized in that: A push-out block (28) is arranged inside the empty slot (31) and at the bottom end of the L-shaped block (24), and a connecting spring (29) is fixedly installed inside the empty slot (31) and fixedly installed with the bottom end of the push-out block (28).

9. A NMP solvent filtering and recovery device under a high vacuum state according to claim 8, wherein a cavity (32) is provided at one end of the filter cabinet (2), a connecting plate (33) is fixedly installed inside the cavity (32) through the filter cabinet (2) at one end, a fixing seat (34) is symmetrically fixedly installed inside the cavity (32), and a guide rod (35) is symmetrically fixedly installed in the middle of the fixing seat (34), two groups of the fixing seats (34) are slidably connected to the middle of the fixing seats (34), a driving plate (37) slidably connected to the fixing seat (34) at one end is fixedly installed at one end of the sliding seat (36), and the driving plate (37) is fixedly installed at one end of the sliding seat (36). 7) A connecting block (38) is fixedly installed through the fixed seat (34) and the middle part of the connecting plate (33); one end of the fixed seat (34) is rotatably connected to a driving eccentric gear (39); one end of the sliding seat (36) is rotatably connected to a driven eccentric gear (40) meshing with the driving eccentric gear (39); a connecting arm (41) is rotatably connected to the center of the driving eccentric gear (39) and the driven eccentric gear (40); one end of the filter cabinet (2) is fixedly installed with a rotating motor (42); and the output shaft end of the rotating motor (42) passes through the filter cabinet (2) and is fixedly installed with the fixed seat (34) at one end and the driving eccentric gear (39).

10. According to the NMP solvent filtering and recovery device under high vacuum state as claimed in claim 7, a slanted panel (43) for facilitating material discharge is fixedly installed inside the filtering cabinet (2) and at one end of the feeding pipe (7).

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