A wet lithium battery diaphragm production line dichloromethane recovery system

Abstract

The present application relates to dichloromethane recovery technical field, specifically to a kind of wet lithium battery diaphragm production line dichloromethane recovery system, including primary condenser, secondary condenser, tertiary condenser, stratified tank, aeration tank and gas-liquid separator, the air inlet pipe of the primary condenser is provided with pretreatment device, the stratified tank is equipped with first recovery pipe and first waste pipe, the aeration tank is equipped with second recovery pipe and second waste pipe, the aeration tank is equipped with aeration fan, the present application recycles and utilizes water phase change heat in desorption steam by primary condenser, the gas, liquid temperature at export is above 90 DEG C, most of dichloromethane is still gaseous, and most of water is liquefied, after separation by gas-liquid separator, the gas phase containing a small amount of water is sent to subsequent secondary condenser and tertiary condenser, can greatly reduce cooling load, and high-temperature liquid phase is directly sent to aeration tank, and it is not necessary to heat again, and the purpose of energy saving can be achieved.

Description

Technical Field

[0001] This invention relates to the field of dichloromethane recovery technology, and more particularly to a dichloromethane recovery system for a wet-process lithium battery separator production line. Background Technology

[0002] Currently, the wet-process lithium-ion battery separator production process involves mixing raw materials PE and paraffin oil in a certain proportion, then extruding the mixture through a die to obtain a cast sheet of a specific size. The paraffin oil acts as a pore-forming agent, stretching it to create the required micropores within the separator. The paraffin oil is then extracted with dichloromethane (DCM) to obtain the finished base membrane. However, since DCM is a volatile organic solvent, some DCM is carried out through the extraction outlet, causing environmental pollution and DCM loss upon evaporation. Therefore, in this area, the DCM is collected and recycled, then transported to a waste gas recovery system using a fan.

[0003] Currently, the exhaust gas recovery systems used in domestic wet-process diaphragm production all require cooling the 105℃ mixed steam to below 20℃, which not only consumes a large amount of circulating water and low-temperature water, but also requires reheating during the aeration process, resulting in serious energy waste and uneconomical operation. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a dichloromethane recovery system for a wet-process lithium battery separator production line to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this invention provides a dichloromethane recovery system for a wet-process lithium-ion battery separator production line, comprising a primary condenser, a secondary condenser, a tertiary condenser, a stratification tank, an aeration tank, and a gas-liquid separator. The primary condenser's inlet pipe is equipped with a pretreatment device. The primary condenser's outlet pipe is connected to the secondary condenser's inlet pipe, and the primary condenser's liquid outlet pipe is connected to the gas-liquid separator. The secondary condenser's outlet pipe is connected to the tertiary condenser's inlet pipe, and the tertiary condenser's outlet pipe is connected to the stratification tank. The stratification tank is equipped with a first recovery pipe and a first waste discharge pipe, the first waste discharge pipe being connected to the aeration tank. The aeration tank is equipped with a second recovery pipe and a second waste discharge pipe. The gas-liquid separator's outlet pipe is connected to the primary condenser's outlet pipe, and the gas-liquid separator's liquid outlet pipe is connected to the aeration tank. The aeration tank is equipped with an aeration fan, and the aeration fan's outlet is connected to the interior of the aeration tank.

[0006] Preferably, the pretreatment apparatus includes:

[0007] The first connecting tube has a first processing tube connected to one end, and at least two rectangular through holes penetrating the other end are provided on one side of the first processing tube.

[0008] The non-woven fabric has one end passing through a rectangular through hole to exit the first processing tube, and another rectangular through hole to exit the first processing tube. The other end of the non-woven fabric is located on the same side of the first processing box.

[0009] A switching component is disposed on the first processing tube, and the switching component is connected to both ends of the nonwoven fabric via a transmission connection;

[0010] A sealing adjustment assembly is disposed inside the first processing tube. The sealing adjustment assembly is used to seal all rectangular through holes and clamp the nonwoven fabric.

[0011] The second processing tube has one end connected to the end of the first processing tube away from the first connecting tube, and the other end connected to a second connecting tube for connecting to the inlet pipe of the first stage condenser.

[0012] The gas volume detection component is located in the second processing tube near the first processing tube;

[0013] The adsorption zone is located inside the second processing tube.

[0014] Preferably, the switching component includes:

[0015] The mounting plate is fixed to the bottom of the first processing tube;

[0016] A belt-type synchronous pulley assembly is located at the bottom of the mounting plate;

[0017] The mounting frame is fixed to the bottom of the mounting plate;

[0018] A motor is fixedly mounted on the mounting frame, and the output shaft of the motor passes through the mounting frame and is fixedly connected to a pulley of the belt synchronous pulley set.

[0019] At least one first guide post is disposed on one side of the first processing tube, and the first guide post is rotatably connected to the top of the mounting plate;

[0020] Two winding posts are both located on the side of the first processing tube away from the first guide post. Each winding post is rotatably connected to the top of the mounting plate, and one end of each winding post passes through the mounting plate and is fixedly connected to one pulley of the belt synchronous pulley set.

[0021] At least two second guide posts are respectively disposed at one point between the first processing tube and the winding post, and each second guide post is rotatably connected to the top of the mounting plate;

[0022] The nonwoven fabric is a roll, which is wrapped around a winding post. One end of the nonwoven fabric passes through a second guide post, through a rectangular through hole to exit the first processing box and be wrapped around the first guide post, and then through another rectangular through hole to exit the first processing box. It is then fixedly connected to another winding post via another second guide post.

[0023] Preferably, the sealing adjustment assembly includes:

[0024] Two first loop-shaped frames are fixed inside the first processing box, and the sides of the two first loop-shaped frames that are close to each other are respectively flush with the sides of the two rectangular through holes that are far from each other.

[0025] At least two second loop frames are disposed between two first loop frames. Each second loop frame is slidably connected to the inner wall of the first processing box. A PTFE sealing ring is fixed on the side of each second loop frame and the first loop frame that are close to each other. A clamping assembly is installed between the two second loop frames.

[0026] Preferably, the clamping assembly includes a first connecting rod disposed between two second loop frames. An electric push rod is fixedly mounted on the top of the first processing tube. A second connecting rod is fixedly mounted on the telescopic rod of the electric push rod passing through the top of the first processing tube. The free end of the second connecting rod is fixedly connected to the middle of the connecting rod. Each of the second loop frames is provided with a clamping groove, an inclined groove, and a decompression groove on its side. Each clamping groove is disposed in the middle of the second loop frame. One end of each inclined groove is connected to the clamping groove, and the other end is connected to the decompression groove. The depth of each decompression groove is greater than the depth of the clamping groove. Both ends of the first connecting rod are fixedly provided with waist-shaped blocks. The arc surface of each waist-shaped block is respectively fitted onto the inclined side of the inclined groove.

[0027] Preferably, the gas volume detection component includes:

[0028] A chute is provided inside the wall of the second processing tube;

[0029] A limiting through hole is provided in the middle of the slide groove, extending from the outside to the inside of the second processing tube;

[0030] A sealed sliding plate is slidably connected within the groove.

[0031] The detection spoon has its free end fixed in the middle of the sealing slide plate, and the rod of the detection spoon is slidably connected to the limiting through hole;

[0032] An observation block is disposed on the outside of the second processing tube, and the observation block is slidably connected to the limiting through hole;

[0033] A fixing block is fixed on the outer wall of the second processing tube;

[0034] A first guide rod is inserted through the fixed block, and one end of the first guide rod is fixedly connected to the observation block;

[0035] A first spring is sleeved on the first guide rod, with its two ends abutting against the observation block and the fixing block, respectively.

[0036] Preferably, the adsorption zone comprises two wire meshes and activated carbon particles installed between them. Each wire mesh is fixed inside the second treatment tube. A storage box is fixed to the top of the second treatment tube, and a box cover is detachably connected to the top of the storage box. An inlet is opened at the top of the adsorption zone, and the inlet communicates with the bottom of the storage box. A first sealing bottom plate for closing the inlet is slidably connected to the inner top of the second treatment tube. Two symmetrically arranged discharge ports are opened at the bottom of the adsorption zone. A second sealing bottom plate is provided at the bottom of each discharge port. The ends of the two second sealing bottom plates that are close to each other are hinged to the bottom of the second treatment tube. A linkage component is provided on the side of the second treatment tube, and the linkage component is drivenly connected to the first sealing bottom plate and the second sealing bottom plate.

[0037] Preferably, a support plate extends downward from the center of the bottom of the adsorption zone, and support cylinders are hinged on both sides of the support plate. A second guide rod is passed through the free end of each support cylinder, and the free end of each second guide rod is hinged to the bottom of the second sealing base plate. A second spring is provided inside each support cylinder, and the two ends of each second spring abut against the end of the support cylinder near the support plate and the second guide rod, respectively.

[0038] Preferably, the linkage component includes:

[0039] A connecting shaft, one end of which extends through one side of the adsorption zone to the other side, and a knob is fixedly provided at one end of the connecting shaft;

[0040] The first gear is disposed inside the adsorption zone and is sleeved on the connecting shaft and fixedly connected.

[0041] The second gear is disposed outside the adsorption zone and is sleeved on the connecting shaft and fixedly connected.

[0042] A single-sided toothed rack is disposed inside the adsorption zone, and a connecting strip is fixedly provided on the back side of the single-sided toothed rack. The free end of the connecting strip is fixedly connected to the first sealing base plate.

[0043] A double-sided rack is slidably connected to the side of the second processing tube;

[0044] Two third gears are fixedly connected to the shaft at the hinge of the second sealing base plate, and each of the third gears meshes with one side of the double-sided rack.

[0045] Specifically, when the first gear meshes with the single-sided rack, the second gear does not mesh with one side of the double-sided rack; when the first gear does not mesh with the single-sided rack, the second gear meshes with one side of the double-sided rack.

[0046] Preferably, a connecting plate is fitted onto the end of the connecting shaft away from the knob, and limiting blocks are fitted onto both sides of the connecting plate. Each limiting block is fixedly connected to the connecting shaft. At least one third guide rod passes through the connecting plate and is fixedly connected to the second processing tube. Two L-shaped plates are fixedly provided at the bottom of the connecting plate, and the free ends of each L-shaped plate are respectively located at the bottom of the second sealing base plate.

[0047] The beneficial effects of this invention are:

[0048] This invention utilizes the heat of water phase transformation in the desorbed steam through a primary condenser. The outlet gas and liquid temperatures are above 90°C. Most of the dichloromethane remains gaseous, while most of the water is liquefied. After separation by a gas-liquid separator, the gas phase containing a small amount of water is sent to the subsequent secondary and tertiary condensers, which can significantly reduce the cooling load. The high-temperature liquid phase is directly sent to the aeration tank without further heating, thus achieving energy saving.

[0049] As the exhaust gas passes through the pretreatment device, it sequentially passes through the non-woven fabric, the detection spoon, and activated carbon particles. When the exhaust gas passes through the detection spoon, it is blown and moved by the exhaust gas. The detection spoon drives the sealing slide plate and the observation block to rotate, increasing the elastic potential energy of the first spring. The greater the ventilation volume of the exhaust gas through the non-woven fabric, the greater the distance the detection spoon and the observation block move. The ventilation volume of the exhaust gas through the non-woven fabric can be judged by the position of the observation block in the limiting through hole. When the observation block gets closer and closer to the initial position in the limiting through hole, it indicates that a large amount of dust and foreign matter are attached to the non-woven fabric, reducing the ventilation volume. The non-woven fabric needs to be replaced in time. First, the non-woven fabric is loosened by the working of the clamping component. Then, a winding column is driven to rotate by the motor. The winding column drives another winding column to rotate through the belt synchronous pulley set, so that the clean non-woven fabric is released from one winding column into the first treatment tube. The non-woven fabric to be replaced is wound onto the other winding column, achieving the purpose of quick and convenient replacement of the non-woven fabric. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the overall process of an embodiment of the present invention;

[0052] Figure 2 This is a three-dimensional structural diagram of the pretreatment device according to an embodiment of the present invention;

[0053] Figure 3 This is a schematic diagram of the internal structure of the first processing tube in an embodiment of the present invention;

[0054] Figure 4 This is a three-dimensional structural diagram of the bottom of the mounting plate according to an embodiment of the present invention;

[0055] Figure 5 This is a three-dimensional structural diagram of the sealing adjustment assembly according to an embodiment of the present invention;

[0056] Figure 6 This is a schematic diagram of the planar structure of the clamping assembly according to an embodiment of the present invention;

[0057] Figure 7 This is a cross-sectional view of the second processing tube according to an embodiment of the present invention;

[0058] Figure 8 This is an embodiment of the present invention. Figure 7 Enlarged structural diagram at point A;

[0059] Figure 9 This is a three-dimensional structural diagram of the linkage component according to an embodiment of the present invention;

[0060] Figure 10 This is a schematic diagram of the structure of the second processing tube away from the knob in an embodiment of the present invention.

[0061] The diagram is marked as follows:

[0062] 1. Primary condenser; 2. Secondary condenser; 3. Tertiary condenser; 4. Layered tank; 5. Aeration tank; 6. Gas-liquid separator; 7. Pretreatment device; 8. First recovery pipe; 9. First waste discharge pipe; 10. Second recovery pipe; 11. Second waste discharge pipe; 12. Aeration blower; 13. First connecting pipe; 14. First treatment pipe; 15. Non-woven fabric; 16. Second treatment pipe; 17. Second connecting pipe; 18. Mounting plate; 19. Belt synchronous pulley set; 20. Mounting frame; 21. Motor; 22. First guide column; 23. Winding column; 24. Second guide column; 25. First loop frame; 26. Second loop frame; 27. PTFE sealing ring; 28. First connecting rod; 29. ​​Electric push rod; 30. Second connecting rod; 31. Pressing groove 32. Inclined groove; 33. Decompression groove; 34. Waist-shaped block; 35. Sliding groove; 36. Limiting through hole; 37. Sealing slide plate; 38. Detection spoon; 39. Observation block; 40. Fixing block; 41. First guide rod; 42. First spring; 43. Wire mesh; 44. Storage box; 45. Box cover; 46. Feed inlet; 47. First sealing base plate; 48. Discharge port; 49. Second sealing base plate; 50. Support plate; 51. Support cylinder; 52. Second guide rod; 53. Second spring; 54. Connecting shaft; 55. Knob; 56. First gear; 57. Second gear; 58. Single-sided rack; 59. Connecting strip; 60. Double-sided rack; 61. Third gear; 62. Connecting plate; 63. Limiting block; 64. Third guide rod; 65. L-shaped plate. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0064] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] As an optional embodiment, a dichloromethane recovery system for a wet-process lithium-ion battery separator production line includes a primary condenser 1, a secondary condenser 2, a tertiary condenser 3, a stratification tank 4, an aeration tank 5, and a gas-liquid separator 6. The inlet pipe of the primary condenser 1 is equipped with a pretreatment device 7. The outlet pipe of the primary condenser 1 is connected to the inlet pipe of the secondary condenser 2. The liquid outlet pipe of the primary condenser 1 is connected to the gas-liquid separator 6. The outlet pipe of the secondary condenser 2 is connected to the inlet pipe of the tertiary condenser 3. The condenser 3's outlet pipe is connected to the stratification tank 4. The stratification tank 4 is provided with a first recovery pipe 8 and a first waste discharge pipe 9. The first waste discharge pipe 9 is connected to the aeration tank 5. The aeration tank 5 is provided with a second recovery pipe 10 and a second waste discharge pipe 11. The gas-liquid separator 6's outlet pipe is connected to the outlet pipe of the first-stage condenser 1. The liquid outlet pipe of the gas-liquid separator 6 is connected to the aeration tank 5. The aeration tank 5 is equipped with an aeration fan 12, and the air outlet of the aeration fan 12 is connected to the interior of the aeration tank 5.

[0066] like Figure 1 As shown, the gas phase at the top of the primary condenser 1 goes directly to the inlet of the secondary condenser 2, while the liquid phase at the bottom of the primary condenser 1 enters the gas-liquid separator 6. The liquid phase at the bottom of the gas-liquid separator 6 is directly sent to the aeration tank 5. The solenoid valve controls the gas-liquid separator 6 to maintain a certain liquid level at the bottom, forming a liquid seal. The gas phase pipe of the gas-liquid separator 6 is connected to the gas phase pipe of the primary condenser 1. The steam heating coil in the aeration tank 5 is eliminated. The water phase in the desorbed steam is recycled and heated by the primary condenser 1. The outlet gas and liquid temperatures are above 90°C. Most of the dichloromethane is still gaseous, while most of the water is liquefied. The gas phase containing a small amount of water after separation by the gas-liquid separator 6 goes to the subsequent secondary condenser 2 and tertiary condenser 3, which can significantly reduce the cooling load. The high-temperature liquid phase is directly sent to the aeration tank 5 without further heating, achieving the purpose of energy saving. After implementation, based on a desorption steam consumption of 1.5 t / h, this invention can reduce the cooling load of the secondary condenser 2 and the tertiary condenser 3 by approximately 0.47 GJ / h, and the aeration tank 5 can save 80 kg / h of steam consumption.

[0067] As an optional embodiment, the pretreatment device 7 includes:

[0068] The first connecting pipe 13 has a first processing pipe 14 connected to one end, and at least two rectangular through holes penetrating the other end are provided on one side of the first processing pipe 14.

[0069] The non-woven fabric 15 has one end passing through a rectangular through hole to exit the first processing tube 14, and another rectangular through hole to exit the first processing tube 14. The other end of the non-woven fabric 15 is located on the same side of the first processing box.

[0070] A switching component is disposed on the first processing tube 14, and the switching component is connected to both ends of the nonwoven fabric 15 via a transmission connection.

[0071] A sealing adjustment assembly is disposed inside the first processing tube 14. The sealing adjustment assembly is used to seal all rectangular through holes and clamp the nonwoven fabric 15.

[0072] The second processing pipe 16 has one end connected to the end of the first processing pipe 14 away from the first connecting pipe 13, and the other end connected to a second connecting pipe 17 for connecting to the inlet pipe of the first stage condenser 1.

[0073] The gas volume detection component is located on the second processing tube 16 near the first processing tube 14;

[0074] The adsorption zone is located inside the second processing tube 16.

[0075] As an optional embodiment, the switching component includes:

[0076] Mounting plate 18 is fixed to the bottom of the first processing tube 14;

[0077] A belt-type synchronous pulley set 19 is disposed at the bottom of the mounting plate 18;

[0078] Mounting frame 20 is fixed to the bottom of mounting plate 18;

[0079] Motor 21 is fixedly mounted on the mounting frame 20, and the output shaft of motor 21 passes through the mounting frame 20 and is fixedly connected to a pulley of the belt synchronous pulley group 19.

[0080] At least one first guide post 22 is disposed on one side of the first processing tube 14, and the first guide post 22 is rotatably connected to the top of the mounting plate 18;

[0081] Two winding posts 23 are both located on the side of the first processing tube 14 away from the first guide post 22. Each winding post 23 is rotatably connected to the top of the mounting plate 18, and one end of each winding post 23 passes through the mounting plate 18 and is fixedly connected to one pulley of the belt synchronous pulley set 19.

[0082] At least two second guide posts 24 are respectively disposed at a point between the first processing tube 14 and the winding post 23, and each second guide post 24 is rotatably connected to the top of the mounting plate 18;

[0083] The nonwoven fabric 15 is a roll, which is wrapped around a winding post 23. One end of the nonwoven fabric 15 passes through a second guide post 24, through a rectangular through hole to exit the first processing box and be wrapped around the first guide post 22, and then through another rectangular through hole to exit the first processing box. It is then fixedly connected to another winding post 23 via another second guide post 24.

[0084] As an optional embodiment, the sealing adjustment assembly includes:

[0085] Two first loop-shaped frames 25 are fixed inside the first processing box, and the sides of the two first loop-shaped frames 25 that are close to each other are respectively flush with the sides of the two rectangular through holes that are far from each other.

[0086] At least two second loop frames 26 are disposed between two first loop frames 25. Each second loop frame 26 is slidably connected to the inner wall of the first processing box. Each second loop frame 26 and the first loop frame 25 are fixed with a PTFE sealing ring 27 on the side close to each other. A clamping assembly is installed between the two second loop frames 26.

[0087] As an optional embodiment, the clamping assembly includes a first connecting rod 28, which is disposed between two second loop frames 26. An electric push rod 29 is fixedly disposed on the top of the first processing tube 14. A second connecting rod 30 is fixedly disposed through the telescopic rod of the electric push rod 29 through the top of the first processing tube 14. The free end of the second connecting rod 30 is fixedly connected to the middle of the connecting rod. Each side of the second loop frame 26 is provided with a clamping groove 31, a sloping groove 32, and a decompression groove 33. Each clamping groove 31 is disposed in the middle of the second loop frame 26. One end of each sloping groove 32 is connected to the clamping groove 31, and the other end is connected to the decompression groove 33. The depth of each decompression groove 33 is greater than the depth of the clamping groove 31. Both ends of the first connecting rod 28 are fixedly provided with waist-shaped blocks 34. The arc surface of each waist-shaped block 34 is respectively attached to the inclined side of the sloping groove 32.

[0088] like Figures 2 to 6As shown, exhaust gas is introduced into the first connecting pipe 13. The exhaust gas first passes through the non-woven fabric 15 for impurity removal, filtering out dust and foreign matter. Then it enters the second treatment pipe 16, where activated carbon particles remove paraffin oil. Finally, it passes through the second connecting pipe 17 into the first-stage condenser 1 for further recycling. When the non-woven fabric 15 needs to be replaced, the exhaust gas inlet is first shut off. Then, the electric push rod 29 drives the second connecting rod 30 upwards, which in turn drives the first connecting rod 28 upwards. The first connecting rod 28 then drives the two waist-shaped blocks 34 upwards, causing them to move from the pressing groove 31 through the inclined groove 32 into the decompression groove 33. This releases the two second loop frames 26 from pressing the non-woven fabric 15. A motor 21 drives one winding column 23 to rotate, which in turn drives the other winding column 23 to rotate via a belt-type synchronous pulley set 19, allowing the dry... Clean nonwoven fabric 15 is released from one winding column 23 into the first processing tube 14, and the nonwoven fabric 15 to be replaced is wound onto another winding column 23, achieving the purpose of quick and convenient replacement of nonwoven fabric 15. After replacement, the electric push rod 29 drives the second connecting rod 30 to reset, so that the waist-shaped block 34 enters the pressing groove 31 to squeeze the two second loop frames 26 away from each other and move them apart. It also works with the PTFE sealing ring 27 to press the nonwoven fabric 15. At the same time, the PTFE sealing ring 27 is deformed due to compression, and the rectangular through hole is sealed to prevent exhaust gas leakage.

[0089] As an optional embodiment, the gas volume detection component includes:

[0090] The chute 35 is disposed inside the wall of the second processing pipe 16;

[0091] A limiting through hole 36 is provided in the middle of the slide groove 35, extending from the outside to the inside of the second processing tube 16;

[0092] The sealing slide plate 37 is slidably connected within the slide groove 35;

[0093] The detection spoon 38 has its free end fixed in the middle of the sealing slide plate 37, and the rod of the detection spoon 38 is slidably connected to the limiting through hole 36;

[0094] An observation block 39 is disposed on the outside of the second processing tube 16, and the observation block 39 is slidably connected to the limiting through hole 36;

[0095] The fixing block 40 is fixed on the outer wall of the second processing tube 16;

[0096] The first guide rod 41 is inserted through the fixed block 40, and one end of the first guide rod 41 is fixedly connected to the observation block 39.

[0097] The first spring 42 is sleeved on the first guide rod 41, and the two ends of the first spring 42 abut against the observation block 39 and the fixing block 40 respectively.

[0098] like Figure 2 , Figure 7 and Figure 8 As shown, when the exhaust gas passes through the detection spoon 38, the detection spoon 38 is blown by the exhaust gas and moves. The detection spoon 38 drives the sealing slide plate 37 and the observation block 39 to rotate. The elastic potential energy of the first spring 42 increases, the ventilation volume of the exhaust gas passing through the non-woven fabric 15 is greater, and the distance that the detection spoon 38 and the observation block 39 move is greater. The ventilation volume of the exhaust gas passing through the non-woven fabric 15 can be judged according to the position of the observation block 39 in the limiting through hole 36. When the observation block 39 gets closer and closer to the initial position in the limiting through hole 36, it indicates that a large amount of dust and foreign matter are attached to the non-woven fabric 15, which reduces the ventilation volume. The non-woven fabric 15 needs to be replaced in time.

[0099] As an optional embodiment, the adsorption zone comprises two wire meshes 43 and activated carbon particles installed between the two wire meshes 43. Each wire mesh 43 is fixed inside the second processing tube 16. A storage box 44 is fixed to the top of the second processing tube 16. A box cover 45 is detachably connected to the top of the storage box 44. A feed inlet 46 is opened at the top of the adsorption zone. The feed inlet 46 communicates with the bottom of the storage box 44. A first sealing bottom plate 47 for closing the feed inlet 46 is slidably connected to the inner top of the second processing tube 16. Two symmetrically arranged discharge ports 48 are opened at the bottom of the adsorption zone. A second sealing bottom plate 49 is provided at the bottom of each discharge port 48. The two second sealing bottom plates 49 are hinged to the bottom of the second processing tube 16 at their closest points. A linkage assembly is provided on the side of the second processing tube 16. The linkage assembly is drivenly connected to the first sealing bottom plate 47 and the second sealing bottom plate 49.

[0100] As an optional embodiment, a support plate 50 extends downward from the center of the bottom of the adsorption zone. Support cylinders 51 are hinged on both sides of the support plate 50. A second guide rod 52 is passed through the free end of each support cylinder 51. The free end of each second guide rod 52 is hinged to the bottom of the second sealing base plate 49. A second spring 53 is provided inside each support cylinder 51. The two ends of each second spring 53 abut against the end of the support cylinder 51 that is close to the support plate 50 and the second guide rod 52, respectively.

[0101] As an optional embodiment, the linkage component includes:

[0102] A connecting shaft 54, one end of which extends through one side of the adsorption area to the other side, and a knob 55 is fixedly provided at one end of the connecting shaft 54;

[0103] The first gear 56 is disposed inside the adsorption zone and is sleeved on the connecting shaft 54 ​​and fixedly connected.

[0104] The second gear 57 is disposed outside the adsorption area, and the second gear 57 is sleeved on the connecting shaft 54 ​​and fixedly connected.

[0105] A single-sided toothed rack 58 is disposed inside the adsorption zone. A connecting strip 59 is fixedly provided on the back side of the single-sided toothed rack 58. The free end of the connecting strip 59 is fixedly connected to the first sealing base plate 47.

[0106] A double-sided rack 60 is slidably connected to the side of the second processing tube 16;

[0107] Two third gears 61 are fixedly connected to the shaft at the hinge of the second sealing base plate 49, and each of the third gears 61 meshes with one side of the double-sided rack 60.

[0108] Specifically, when the first gear 56 meshes with the single-sided rack 58, the second gear 57 does not mesh with one side of the double-sided rack 60; when the first gear 56 does not mesh with the single-sided rack 58, the second gear 57 meshes with one side of the double-sided rack 60.

[0109] As an optional embodiment, a connecting plate 62 is sleeved on the end of the connecting shaft 54 ​​away from the knob 55. Limiting blocks 63 are attached to both sides of the connecting plate 62, and each limiting block 63 is fixedly connected to the connecting shaft 54. At least one third guide rod 64 passes through the connecting plate 62, and the third guide rod 64 is fixedly connected to the second processing tube 16. Two L-shaped plates 65 are fixedly provided at the bottom of the connecting plate 62, and the free end of each L-shaped plate 65 is respectively set at the bottom of the second sealing base plate 49.

[0110] like Figure 2 , Figure 7 , Figure 9 and Figure 10As shown, the storage box 44 is filled with new activated carbon granules. When the activated carbon granules between the two wire meshes 43 need to be replaced, first push the knob 55 to move the connecting shaft 54. The connecting shaft 54 ​​moves the connecting plate 62 through the limit block 63. The connecting plate 62 moves the L-shaped plate 65, causing one end of the L-shaped plate 65 to separate from the second sealing base plate 49. At this time, the double-sided rack 60 meshes with the second gear 57, and the single-sided rack 58 does not mesh with the first gear 56. By rotating the knob 55, the connecting shaft 54 ​​rotates, which in turn rotates the second gear 57. The second gear 57 moves the double-sided rack 60, which in turn rotates the third gear 61. The third gear 61 causes the second sealing base plate 49 to flip, opening the discharge port 48. The activated carbon granules in the adsorption zone slide from the discharge port 48 along the second sealing base plate 49 to the outside of the second treatment tube 16, thus realizing the unloading of activated carbon granules. After unloading, the second spring... When spring 53 is activated, it pushes the second guide rod 52 to support the second sealing base plate 49 to reset, thereby resealing the discharge port 48. By pulling knob 55, the connecting shaft 54 ​​moves, and the connecting shaft 54 ​​drives the connecting plate 62 to move via limit block 63. The connecting plate drives the L-shaped plate 65 to move, so that one end of the L-shaped plate 65 is reset at the bottom of the second sealing base plate 49 to improve the sealing stability of the discharge port 48. At this time, the first gear 56 meshes with the single-sided rack 58, and the second gear 57 does not mesh with the double-sided rack 60. By rotating knob 55, the connecting shaft 54 ​​drives the first gear 56 to rotate, and the first gear 56 drives the single-sided rack 58 to move. The single-sided rack 58 drives the first sealing base plate 47 to move via connecting bar 59, thereby opening the feed port 46. New activated carbon particles in storage box 44 fall into the adsorption zone. Finally, rotating knob 55 resets the first sealing plate to reseal the feed port 46, thus completing the activated carbon particle filling work in the adsorption zone.

[0111] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A wet lithium battery separator production line dichloromethane recovery system, comprising a first condenser (1), a second condenser (2), a third condenser (3), a stratification tank (4), an aeration tank (5) and a gas-liquid separator, characterized in that, The air inlet pipe of the primary condenser (1) is provided with a pretreatment device (7), the air outlet pipe of the primary condenser (1) is communicated with the air inlet pipe of the secondary condenser (2), the liquid outlet pipe of the first condenser is communicated with the gas-liquid separator, the air outlet pipe of the secondary condenser (2) is communicated with the air inlet pipe of the tertiary condenser (3), the air outlet pipe of the tertiary condenser (3) is communicated with the stratification tank (4), the stratification tank (4) is provided with a first recovery pipe (8) and a first waste discharge pipe (9), the first waste discharge pipe (9) is communicated with the aeration tank (5), the aeration tank (5) is provided with a second recovery pipe (10) and a second waste discharge pipe (11), the air outlet pipe of the gas-liquid separator is communicated with the air outlet pipe of the primary condenser (1), the liquid outlet pipe of the gas-liquid separator is communicated with the aeration tank (5), the aeration tank (5) is provided with an aeration fan (12), and the air outlet of the aeration fan (12) is communicated with the inside of the aeration tank (5); The pretreatment device (7) comprises: A first connecting pipe (13) is provided with a first treatment pipe (14) at one end, and at least two rectangular through holes are provided on one side of the first treatment pipe (14) and penetrate the other end; A non-woven fabric (15) penetrates one rectangular through hole of the first treatment pipe (14) at one end and penetrates another rectangular through hole of the first treatment pipe (14) at the other end and is located on the same side of the first treatment box; A switching assembly is arranged on the first treatment pipe (14) and is in transmission connection with both ends of the non-woven fabric (15); A sealing adjustment assembly is arranged in the first treatment pipe (14) and is used for sealing all the rectangular through holes and clamping the non-woven fabric (15); A second treatment pipe (16) is in communication with the end of the first treatment pipe (14) away from the first connecting pipe (13) at one end and is provided with a second connecting pipe (17) for connecting the air inlet pipe of the primary condenser (1) at the other end; An air volume detection assembly is arranged on the second treatment pipe (16) close to the first treatment pipe (14); An adsorption area is arranged in the second treatment pipe (16); The switching assembly comprises: An installation plate (18) is fixedly arranged at the bottom of the first treatment pipe (14); A belt synchronous wheel group (19) is arranged at the bottom of the installation plate (18); An installation frame (20) is fixedly arranged at the bottom of the installation plate (18); A motor (21) is fixedly arranged on the installation frame (20), and an output shaft of the motor (21) is fixedly connected with one belt pulley of the belt synchronous wheel group (19) through the installation frame (20); At least one first guide column (22) is arranged on one side of the first treatment pipe (14) and is rotationally connected to the top of the installation plate (18); Two winding columns (23) are arranged on the side of the first treatment pipe (14) away from the first guide column (22), each winding column (23) is rotationally connected to the top of the mounting plate (18), and one end of each winding column (23) is fixedly connected to a belt pulley of the belt synchronous pulley set (19) through the mounting plate (18); At least two second guide columns (24) are arranged between the first treatment pipe (14) and the winding column (23), and each second guide column (24) is rotationally arranged on the top of the mounting plate (18); Wherein, the non-woven fabric (15) is a roll, after being sleeved on a winding column (23), one end of the non-woven fabric (15) passes through a second guide column (24), penetrates out of the first treatment box through a rectangular through hole, is sleeved on the first guide column (22), penetrates out of the first treatment box through another rectangular through hole, and is fixedly connected with another winding column (23) through another second guide column (24); The sealing adjusting assembly comprises: Two first back-shaped frames (25) are fixedly arranged in the first treatment box, and the sides of the two first back-shaped frames (25) close to each other are flush with the sides of the two rectangular through holes away from each other; At least two second back-shaped frames (26) are arranged between the two first back-shaped frames (25), each second back-shaped frame (26) is slidably connected with the inner wall of the first treatment box, and the sides of each second back-shaped frame (26) and the first back-shaped frame (25) close to each other are fixedly provided with a PTFE sealing ring (27), and a pressing assembly is arranged between the two second back-shaped frames (26); The pressing assembly comprises a first connecting rod (28), the first connecting rod (28) is arranged between the two second back-shaped frames (26), the top of the first treatment pipe (14) is fixedly provided with an electric push rod (29), the telescopic rod of the electric push rod (29) penetrates through the top of the first treatment pipe (14) and is fixedly provided with a second connecting rod (30), the free end of the second connecting rod (30) is fixedly connected with the middle part of the connecting rod, the sides of the second back-shaped frame (26) are provided with a pressing groove (31), an inclined groove (32) and a decompression groove (33), each pressing groove (31) is arranged in the middle of the second back-shaped frame (26), one end of each inclined groove (32) is communicated with the pressing groove (31), and the other end is communicated with the decompression groove (33), the depth of each decompression groove (33) is greater than the depth of each pressing groove (31), and the two ends of the first connecting rod (28) are fixedly provided with a waist-shaped block (34), and the arc surfaces of each waist-shaped block (34) are respectively arranged on the inclined edges of the inclined grooves (32).

2. The methylene chloride recovery system for a wet lithium battery separator production line according to claim 1, wherein The gas quantity detection assembly comprises: A sliding groove (35) is arranged in the pipe wall of the second treatment pipe (16); A limiting through hole (36) is arranged in the middle of the sliding groove (35) and penetrates from the outside to the inside of the second treatment pipe (16); A sealing sliding plate (37) is slidably connected in the sliding groove (35); A detection spoon (38) is fixed at the middle of the sealing sliding plate (37), and the rod of the detection spoon (38) is slidably connected with the limiting through hole (36); An observation block (39) is arranged outside the second treatment tube (16), and the observation block (39) is slidably connected with the limiting through hole (36); A fixed block (40) is fixed on the outer wall of the second treatment tube (16); A first guide rod (41) penetrates through the fixed block (40), and one end of the first guide rod (41) is fixedly connected with the observation block (39); A first spring (42) is sleeved on the first guide rod (41), and two ends of the first spring (42) abut against the observation block (39) and the fixed block (40) respectively.

3. The methylene chloride recovery system for a wet lithium battery separator production line of claim 1, wherein, The adsorption area comprises two steel wire meshes (43) and activated carbon particles arranged between the two steel wire meshes (43), each of the steel wire meshes (43) is fixedly arranged in the second treatment tube (16), a storage box (44) is fixedly arranged at the top of the second treatment tube (16), a box cover (45) is detachably connected to the top of the storage box (44), a feeding port (46) is arranged at the top of the adsorption area, the feeding port (46) is in communication with the bottom of the storage box (44), a first sealing bottom plate (47) for closing the feeding port (46) is slidably arranged at the inner top of the second treatment tube (16), two symmetrical discharge ports (48) are arranged at the bottom of the adsorption area, each of the discharge ports (48) is provided with a second sealing bottom plate (49), and the second sealing bottom plates (49) are hingedly connected to the bottom of the second treatment tube (16) at the end close to each other. A linkage assembly is arranged beside the second treatment tube (16), and the linkage assembly is in transmission connection with the first sealing bottom plate (47) and the second sealing bottom plate (49).

4. The methylene chloride recovery system for a wet lithium battery separator production line according to claim 3, wherein A support plate (50) is arranged at the middle of the bottom of the adsorption area and extends downward, support cylinders (51) are hingedly arranged at the two sides of the support plate (50), a second guide rod (52) penetrates through the free end of each support cylinder (51), the free end of each second guide rod (52) is hingedly connected to the bottom of the second sealing bottom plate (49), and a second spring (53) is arranged in each support cylinder (51), and two ends of each second spring (53) abut against the end of the support cylinder (51) close to the support plate (50) and the second guide rod (52) respectively.

5. The methylene chloride recovery system for a wet lithium battery separator production line of claim 3, wherein, The linkage assembly comprises: A connecting shaft (54) penetrates through one side of the adsorption area to the other side, and a knob (55) is fixedly arranged at one end of the connecting shaft (54); A first gear (56) is arranged in the adsorption area, and the first gear is sleeved on the connecting shaft (54) and fixedly connected; A second gear (57) is arranged outside the adsorption area, and the second gear (57) is sleeved on the connecting shaft (54) and fixedly connected; Single-sided rack (58) is arranged inside the adsorption area, the back of the single-sided rack (58) is fixedly provided with a connecting strip (59), and the free end of the connecting strip (59) is fixedly connected with the first sealing bottom plate (47); Double-sided rack (60) is slidably connected on the side of the second treatment pipe (16); Two third gears (61) are respectively fixedly connected with shaft rods at the hinged portions of the second sealing bottom plate (49), and each third gear (61) is meshed with one side of the double-sided rack (60); Wherein, when the first gear (56) is meshed with the single-sided rack (58), the second gear (57) is not meshed with one side of the double-sided rack (60), and when the first gear (56) is not meshed with the single-sided rack (58), the second gear (57) is meshed with one side of the double-sided rack (60).

6. The methylene chloride recovery system for a wet lithium battery separator production line according to claim 5, wherein The end of the connecting shaft (54) away from the knob (55) is sleeved with a connecting plate (62), limit blocks (63) are arranged on the two sides of the connecting plate (62), each limit block (63) is fixedly connected with the connecting shaft (54), at least one third guide rod (64) is arranged on the connecting plate (62), the third guide rod (64) is fixedly connected with the second treatment pipe (16), and two L-shaped plates (65) are fixedly arranged on the bottom of the connecting plate (62), and the free ends of the L-shaped plates (65) are respectively arranged on the bottom of the second sealing bottom plate (49).

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