NMP Recycling Equipment and Control Method for Lithium Batteries Based on PLC Control

Abstract

The present invention discloses an NMP recovery device for lithium batteries based on PLC control, which includes a recovery tower. The recovery tower stores a recovery liquid, and a rotatable rotating shaft is provided in the middle of the recovery tower. A plurality of synchronous shafts are arranged outside the rotating shaft, and a plurality of rotating tubes are arranged at the bottom of the synchronous shafts. An air inlet disc is arranged at the bottom of the rotating shaft, and a plurality of flow equalizing tubes are arranged outside the air inlet disc. A plurality of flow equalizing holes are arranged on the flow equalizing tubes. An air inlet fan is arranged on one side of the recovery tower, and the output end of the air inlet fan is communicated with the flow equalizing tube. A plurality of spray pipes are arranged at the upper end of the rotating shaft. A fixedly connected recovery plate is arranged in the recovery tower, and a plurality of uniformly distributed and through recovery holes are arranged on the recovery plate. Two rotatable rotating frames are arranged in each of the recovery holes. An adsorption cotton is arranged in the rotating frame, and a pressing plate is also arranged in the rotating frame. The designs of the rotating tubes and the flow equalizing tubes can enable the waste gas to enter the recovery liquid in a bubble shape. Such a design can increase the contact probability between the waste gas and the recovery liquid, thereby improving the recovery rate of substances in the waste gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of NMP recovery, and specifically relates to an NMP recovery device for lithium batteries based on PLC control and a control method thereof. Background Art

[0002] NMP, full name N-methylpyrrolidone, is a liquid formed by condensing γ-butyrolactone with methylamine. It has extremely strong volatility and permeability, a pH value of 7-9 (alkaline), is flammable and explosive, and is widely used in the production of lithium batteries. During the manufacturing process of lithium battery electrodes, high-temperature NMP waste gas will be generated. Since NMP is somewhat toxic and expensive, it is generally recycled after the lithium battery is prepared. Currently, when recovering the NMP waste gas generated during the manufacturing process of lithium batteries, it is mainly recovered through the following several methods:

[0003] Plate heat recovery unit: Through plate heat exchange technology, this device can recover the heat in the waste gas and improve energy efficiency.

[0004] Tube-fin heat exchanger: This is a device that uses gas-liquid heat exchange technology to cool NMP in the waste gas.

[0005] High tower: The water scrubber recovers NMP by physical absorption. It uses process water to wet the packing, enabling the waste gas to fully contact and blend with the process water on the packing.

[0006] Absorption tower: This tower is usually used for secondary recovery. It washes the low-concentration waste gas after primary recovery again to ensure that the discharged waste gas meets environmental protection standards.

[0007] The inventor found that when the existing absorption tower performs secondary recovery of waste gas, it usually only recovers the waste gas through a simple spray absorption method. This results in a reduced absorption efficiency of the absorption tower for the waste gas, and it is very easy for the waste gas to be discharged without being treated up to standard, causing air pollution and also easily resulting in the loss of raw materials.

[0008] Therefore, research and improvement are carried out on the existing structure and deficiencies, and an NMP recovery device for lithium batteries based on PLC control and a control method thereof are provided, with the expectation of achieving a more practical value. Summary of the Invention

[0009] Aiming at at least one problem in the prior art, an object of the present invention is to provide an NMP recovery device for lithium batteries based on PLC control and a control method thereof.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions to be implemented:

[0011] The NMP recycling equipment for lithium batteries based on PLC control includes a recycling tower. The recycling liquid is stored in the recycling tower, and a rotatable rotating shaft is provided in the middle of the recycling tower. A plurality of synchronizing shafts that can rotate synchronously with the rotating shaft are provided outside the rotating shaft. A plurality of rotatable rotating tubes are provided at the bottom of the synchronizing shafts. A fixedly connected air inlet disc is provided at the bottom of the rotating shaft. A plurality of fixedly connected flow equalizing tubes are provided outside the air inlet disc. A plurality of flow equalizing holes are provided on the flow equalizing tubes. The inlet pipe is located below the liquid level of the recycling liquid. An air inlet fan is provided on one side of the recycling tower. The air inlet end of the air inlet fan is provided with an inlet pipe, and the output end of the air inlet fan is communicated with the flow equalizing tube. A guiding disc is provided at the upper end of the rotating shaft. A plurality of spray pipes are provided on the guiding disc. A conveying mechanism for conveying the recycling liquid to the spray pipes is provided in the recycling tower. An exhaust pipe is provided at the upper end of the recycling tower. A fixedly connected recycling plate is provided in the recycling tower below the exhaust pipe. A plurality of uniformly distributed and through-type recycling holes are provided on the recycling plate. Two rotatable rotating frames are provided in each of the recycling holes. The upper and lower rotating frames are distributed in a T shape. An adsorption cotton for adsorbing the recycling liquid is provided in the rotating frame, and a pressing plate that can move back and forth and is used for squeezing the adsorption cotton is also provided in the rotating frame.

[0012] Preferably, a fixedly connected worm gear is provided at the bottom of the recycling tower. The rotating shaft rotates through the middle of the worm gear. Worms that are matched and connected with the worm gear are provided on the synchronizing shafts. Sleeves that rotate and are hermetically connected are provided on the synchronizing shafts at both ends of the worm. First fixing plates are fixedly connected to the sleeves. Second fixing plates fixedly connected to the rotating shaft are provided on the first fixing plates. The rotating tubes are rotatably connected to the sleeves. First bevel gears are fixedly connected to both ends of the synchronizing shafts. Second bevel gears that are fixedly connected and meshed with the first bevel gears are provided on the rotating tubes.

[0013] Preferably, a rotatable and hermetically connected air inlet ring plate is provided outside the rotating shaft. An air inlet ring groove is provided on the inner side wall of the air inlet ring plate. A communicating pipe that is communicated with the air inlet ring groove is provided at the output end of the air inlet fan. A first hole that is communicated with the air inlet ring groove is provided on the rotating shaft. A second hole that is communicated with the first hole is provided inside the second fixing plate. A third hole that is communicated with the second hole is provided in the first fixing plate. A communicating ring groove is provided on the inner wall of the sleeve. The third hole is communicated with the communicating ring groove. A fourth hole is provided in the synchronizing shaft. One end of the fourth hole is communicated with the third hole. A rotating connecting pipe is provided in the sleeve. One end of the rotating connecting pipe is rotatably and hermetically connected to the synchronizing shaft and is communicated with the fourth hole. The other end of the rotating connecting pipe is rotatably and hermetically connected to the corresponding rotating tube. The air inlet disc is communicated with the rotating tube.

[0014] Preferably, the air inlet disc is fixedly arranged obliquely at the end of the rotating tube.

[0015] Preferably, the conveying mechanism includes a conveying ring plate and a conveying ring groove. A fixed ring plate is fixedly connected to the bottom of the recovery tower. The fixed ring plate is fixedly connected to the worm gear, and is rotatably and sealingly connected to the rotating shaft. A prismatic conveying ring groove is provided on the inner wall of the fixed ring plate. A reciprocating thread is provided on the rotating shaft located inside the conveying ring groove. A conveying ring plate is provided in the conveying ring groove and is slidably and sealingly connected thereto. The conveying ring plate is connected in a matching manner with the reciprocating thread. A water inlet is provided on the side wall of the conveying ring groove, and a one-way water inlet valve is provided in the water inlet. A drain hole is provided on the rotating shaft, and a one-way drain valve is provided in the drain hole. The extending end of the drain hole communicates with the guide plate.

[0016] Preferably, a driving motor is provided on one side of the recovery tower, and a synchronous chain is connected between the output end of the driving motor and the rotating shaft.

[0017] Preferably, positioning shafts are fixedly connected to the middle parts of both sides of the rotating frame. The positioning shafts are rotatably and sealingly connected to the recovery holes. A plurality of adjustment grooves corresponding to the recovery holes are provided in the recovery plate. Adjustment plates are slidably connected in the adjustment grooves. The end portions of the positioning shafts are located in the adjustment grooves, and gears are fixedly connected to the end portions of the positioning shafts. Rack teeth meshing with the gears are provided on the adjustment plates. Hydraulic rods are fixedly connected in the adjustment grooves and are used to drive the adjustment plates to move up and down.

[0018] Preferably, sliding grooves are provided on the inner walls of the rotating frame on both sides of the adsorption cotton. The extrusion plate is slidably connected to the sliding grooves. One end of each sliding groove is fixedly connected with a return spring for driving the extrusion plate to return to its initial position. The return spring is fixedly connected to one end of the extrusion plate. Flexible connectors are provided at both end portions of the extrusion plate. The connectors are arranged in the sliding grooves, and the extending ends of the connectors movably pass through the ends of the sliding grooves and are fixedly connected to the inner walls of the recovery holes.

[0019] Preferably, symmetrically distributed storage grooves are provided at one end of the rotating frame. A storage shaft is rotatably connected in each storage groove. A sealing tape is evenly wound on the storage shaft, and a tape spring for automatically recovering and winding the sealing tape is provided on the storage shaft. The extending end of the sealing tape movably passes through the side wall of the storage groove and is fixedly connected to the corresponding extrusion plate. An overflow groove for the liquid to flow out after extrusion is provided at the other end of the rotating frame. A discharge groove communicating with the overflow groove is provided in the recovery plate.

[0020] A control method for an NMP recovery device for lithium batteries based on PLC control, using the NMP recovery device for lithium batteries based on PLC control as described above, includes the following steps:

[0021] S1 First, control the intake fan to suck the waste gas through the intake pipe and transport it into the flow equalizing pipe, and let it flow out through the flow equalizing holes. Since the flow equalizing pipe is located below the liquid level of the recovered liquid, the waste gas flowing out of the flow equalizing holes enters the recovered liquid in the form of bubbles, enabling the recovered liquid to preliminarily absorb the waste gas;

[0022] S2 At the same time, control the rotation of the rotating shaft to make the synchronous shaft rotate synchronously with the rotating shaft and the rotating pipe, and make the rotating pipe rotate, so that the flow equalizing pipe rotates in the recovered liquid. The rotation of the flow equalizing pipe can drive the recovered liquid to stir, enabling the waste gas to contact the recovered liquid more fully;

[0023] S3 Then, control the conveying mechanism to convey the recovered liquid through the conveying mechanism to the spray pipe and spray it out, so that the rising waste gas can contact the sprayed recovered liquid again and adsorb and recover the waste gas again;

[0024] The gas after spray adsorption enters the recovery hole. The liquid in the gas is adsorbed and recovered by the adsorption cotton and then discharged. By controlling the rotation of the upper and lower rotating frames, there is always one adsorption cotton lying horizontally in the recovery hole, ensuring that the recovery hole can fully adsorb and recover the liquid in the rising air flow.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] The design of the rotating pipe and the flow equalizing pipe enables the waste gas to enter the recovered liquid in the form of bubbles. This design can further increase the contact probability between the waste gas and the recovered liquid, thereby improving the recovery rate of substances in the waste gas. At the same time, the design of the rotation of the rotating pipe enables the incoming gas to be in a rotating state, which can more effectively improve the uniformity of the contact between the waste gas and the recovered liquid in the recovery tower, thus further improving the recovery efficiency of substances in the waste gas. Moreover, the rotating state of the rotating shaft can also stir the recovered liquid, effectively preventing the accumulation of materials at the bottom of the recovery tower;

[0027] The design of the rotating shaft and the spray pipe can achieve the rotating spray of the recovered liquid, which can more fully increase the contact probability between the recovered liquid and the waste gas, thereby improving the recovery rate of substances in the waste gas;

[0028] The design of the rotating frame and the adsorption cotton can ensure that there is always one adsorption cotton lying horizontally in the recovery hole through the rotatable design of the rotating frame, enabling the waste gas passing through the recovery hole to be fully adsorbed and recovered by the adsorption cotton, improving the absorption rate of the waste liquid in the air flow by the recovery hole; the design of the extrusion plate can extrude the waste liquid under the action of the extrusion plate when the vertical adsorption cotton is not filtering, so as to ensure that the adsorption cotton can be fully absorbed when it is used again.

[0029] With reference to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0030] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0031] It should be emphasized that the term "comprising / including" when used herein refers to the presence of features, wholes, steps or components, but does not exclude the presence or addition of one or more other features, wholes, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the three-dimensional structure provided for Embodiment 1 of the present invention.

[0034] Figure 2 Schematic diagram of the three-dimensional connection structure between the rotating shaft and the flow equalizing pipe provided for Embodiment 1 of the present invention.

[0035] Figure 3 Schematic diagram of the sectional connection structure between the rotating shaft and the fixed ring plate provided for Embodiment 1 of the present invention.

[0036] Figure 4 Schematic diagram of the sectional connection structure between the sleeve and the synchronous shaft provided for Embodiment 1 of the present invention.

[0037] Figure 5 Schematic diagram of the sectional structure of the recovery hole provided for Embodiment 1 of the present invention.

[0038] Figure 6 Schematic diagram of the three-dimensional connection structure between the rotating frames provided for Embodiment 1 of the present invention.

[0039] Figure 7 Schematic diagram of the sectional structure of the rotating frame provided for Embodiment 1 of the present invention.

[0040] Figure 8 Schematic diagram of the three-dimensional connection structure between the extrusion plate and the sealing belt provided for Embodiment 1 of the present invention.

[0041] Figure 9Schematic top view structure diagram of the recovery hole provided in Embodiment 2 of the present invention.

[0042] Figure 10 Schematic cross-sectional structure diagram of the recovery hole provided in Embodiment 2 of the present invention.

[0043] Description of the reference numerals in the figure: 1. Recovery tower; 11. Flow equalizing pipe; 111. Rotating pipe; 12. Spray pipe; 121. Deflector plate; 13. Rotating shaft; 131. Drainage hole; 132. First hole; 133. One-way drainage valve; 14. Recovery plate; 141. Recovery hole; 142. Adsorption cotton; 143. Positioning shaft; 1431. Gear; 144. Adjusting plate; 1441. Rack; 1442. Hydraulic rod; 1443. Adjusting groove; 1444. Telescopic pipe; 1445. Driving groove; 1446. Driving plate; 1447. Jack; 1448. Pressing and telescopic mechanism; 1449. Pressing rod; 145. Rotating frame; 1451. Overflow groove; 1452. Sliding groove; 146. Extrusion plate; 1461. Connecting piece; 1462. Return spring; 147. Sealing strip; 1471. Storage groove; 1472. Storage shaft; 15. Driving motor; 151. Synchronous chain; 16. Fixed ring plate; 161. Conveyor ring plate; 162. Conveyor ring groove; 163. One-way water inlet valve; 17. Worm; 171. Worm gear; 172. Sleeve; 1721. Communicating ring groove; 173. Second fixing plate; 174. Second hole; 175. Synchronous shaft; 176. First bevel gear; 177. Adapter pipe; 178. Second bevel gear; 179. First fixing plate; 1791. Third hole; 2. Intake air fan; 21. Intake pipe; 22. Connecting pipe; 23. Intake air ring plate. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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 of 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.

[0045] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be another intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be another intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] Example 1, please refer to Figure 1 、 Figure 2 and Figure 5 , the NMP recovery device for lithium batteries based on PLC control includes a recovery tower 1. The recovery tower 1 stores a recovery liquid, and a rotatable rotating shaft 13 is provided in the middle of the recovery tower 1. A plurality of synchronous shafts 175 that can rotate synchronously with the rotating shaft 13 are provided outside the rotating shaft 13. A plurality of rotatable rotating tubes 111 are provided at the bottom of the synchronous shaft 175. A fixed-connected air inlet disk is provided at the bottom of the rotating shaft 13. A plurality of fixed-connected flow equalizing tubes 11 are provided outside the air inlet disk. A plurality of flow equalizing holes are provided on the flow equalizing tube 11. The inlet pipe 21 is located below the recovery liquid surface. An air inlet fan 2 is provided on one side of the recovery tower 1. The air inlet end of the air inlet fan 2 is provided with an inlet pipe 21, and the output end of the air inlet fan 2 is communicated with the flow equalizing tube 11. A guide disk 121 is provided at the upper end of the rotating shaft 13. A plurality of spray pipes 12 are provided on the guide disk 121. A conveying mechanism for conveying the recovery to the spray pipe 12 is provided in the recovery tower 1. An exhaust pipe is provided at the upper end of the recovery tower 1. A fixed-connected recovery plate 14 is provided in the recovery tower 1 below the exhaust pipe. A plurality of uniformly distributed and through recovery holes 141 are provided on the recovery plate 14. Two rotatable rotating frames 145 are provided in each of the recovery holes 141. The upper and lower rotating frames 145 are distributed in a T shape. An adsorption cotton for adsorbing the recovery liquid is provided in the rotating frame 145, and a pressing plate 146 that can move back and forth and is used for squeezing the adsorption cotton is also provided in the rotating frame 145.

[0048] The design of the rotating tube 111 and the flow equalizing tube 11 enables the waste gas to enter the recovery liquid in a bubble shape. Such a design can further increase the contact probability between the waste gas and the recovery liquid, thereby improving the recovery rate of substances in the waste gas. At the same time, the design of the rotation of the rotating tube 111 can make the incoming gas in a rotating state. Such a design can more effectively improve the uniformity of the contact between the waste gas and the recovery liquid in the recovery tower 1, thereby further improving the recovery efficiency of substances in the waste gas. And the rotating state of the rotating shaft 13 can also stir the recovery liquid, effectively preventing the accumulation of materials at the bottom of the recovery tower 1;

[0049] The design of the rotating shaft 13 and the spray pipe 12 enables the rotating spray of the recycled liquid, which can more fully increase the contact probability between the recycled liquid and the waste gas, thereby improving the recovery rate of substances in the waste gas.

[0050] The design of the rotating frame 145 and the adsorption cotton 142 can ensure that there is always an adsorption cotton 142 placed horizontally in the recovery hole 141 through the rotatable design of the rotating frame 145. In this way, the waste gas passing through the recovery hole 141 can be fully adsorbed and recovered by the adsorption cotton 142, improving the absorption rate of the waste liquid in the airflow by the recovery hole 141. The design of the extrusion plate 146 can extrude the waste liquid under the action of the extrusion plate 146 when the vertical adsorption cotton 142 is not filtering, so as to ensure that the adsorption cotton 142 can be fully absorbed when it is reused.

[0051] Please refer to Figure 2 and Figure 4 In this embodiment, a fixedly connected worm gear 171 is provided at the bottom of the recovery tower 1. The rotating shaft 13 rotatably passes through the middle of the worm gear 171. Worm gears 17 are provided on the synchronous shafts 175 and are respectively connected to the worm gear 171 in a matching manner. Sleeve pipes 172 are rotatably and sealingly connected to the synchronous shafts 175 at both ends of the worm gears 17. First fixing plates 179 are fixedly connected to the sleeve pipes 172. Second fixing plates 173 fixedly connected to the rotating shaft 13 are provided on the first fixing plates 179. The rotating pipe 111 is rotatably connected to the sleeve pipe 172. First bevel gears 176 are fixedly connected to both ends of the synchronous shaft 175. Second bevel gears 178 fixedly connected to the rotating pipe 111 and meshing with the first bevel gears 176 are provided on the rotating pipe 111.

[0052] The design of the worm gear 171, the worm gear 17, the sleeve pipe 172, the synchronous shaft 175, the first bevel gear 176 and the second bevel gear 178 can realize that while the rotation of the rotating shaft 13 drives the synchronous shaft 175 to rotate synchronously, the rotation of the rotating pipe 111 is also realized through the meshing transmission of the gears, thereby realizing the rotation of the flow equalizing pipe 11 in the recycled liquid.

[0053] Please refer to Figure 2 、 Figure 3 、 Figure 4, in this embodiment, an intake air ring plate 23 which rotates and is sealingly connected is provided outside the rotating shaft 13. An intake air ring groove is provided on the inner side wall of the intake air ring plate 23. A communicating pipe 22 communicating with the intake air ring groove is provided at the output end of the intake air blower 2. A first hole 132 communicating with the intake air ring groove is provided on the rotating shaft 13. A second hole 174 communicating with the first hole 132 is provided inside the second fixing plate 173. A third hole 1791 communicating with the second hole 174 is provided inside the first fixing plate 179. A communicating ring groove 1721 is provided on the inner wall of the sleeve 172. The third hole 1791 communicates with the communicating ring groove 1721. A fourth hole is provided inside the synchronizing shaft 175. One end of the fourth hole communicates with the third hole 1791. A transfer pipe 177 is provided inside the sleeve 172. One end of the transfer pipe 177 is rotatably and sealingly connected to the synchronizing shaft 175, and the transfer pipe 177 communicates with the fourth hole. The other end of the transfer pipe 177 is rotatably and sealingly connected to the corresponding rotating pipe 111. The intake air disc communicates with the rotating pipe 111. The designs of the first hole 132, the second hole 174, the third hole 1791 and the fourth hole enable the rotating pipe 111 to realize the rotation of the flow equalizing pipe 11 and also ensure the transportation of the waste gas;

[0054] In this embodiment, the intake air disc is fixedly arranged in an inclined shape at the end of the rotating pipe 111. The inclined design of the intake air disc enables the flow equalizing pipe 11 to better stir the recovered liquid due to the height difference between the flow equalizing pipes 11 while rotating around the rotating pipe 111. Moreover, the flow equalizing pipe 11 located at the upper end can also break up the rising bubbles generated by the flow equalizing pipe 11 located at the bottom during the movement process, thereby further increasing the contact probability between the waste gas and the recovered liquid, and effectively improving the recovery rate of the waste gas by the recovered liquid.

[0055] Please refer to Figure 2 , Figure 3 , in this embodiment, the conveying mechanism includes a conveying ring plate 161 and a conveying ring groove 162. A fixed ring plate 16 is fixedly connected to the bottom of the recovery tower 1. The fixed ring plate 16 is fixedly connected to the worm gear 171 and is rotatably and sealingly connected to the rotating shaft 13. A prismatic conveying ring groove 162 is provided on the inner wall of the fixed ring plate 16. A reciprocating thread is provided on the rotating shaft 13 located inside the conveying ring groove 162. A conveying ring plate 161 which slides and is sealingly connected is provided in the conveying ring groove 162. The conveying ring plate 161 is connected in a matching manner with the reciprocating thread. A water inlet is provided on the side wall of the conveying ring groove 162. A one-way water inlet valve 163 is provided in the water inlet. A drain hole 131 is provided on the rotating shaft 13. A one-way drain valve 133 is provided in the drain hole 131, and the extending end of the drain hole 131 communicates with the guide disc 121.

[0056] The design of the conveying ring plate 161 and the conveying ring groove 162, in cooperation with the one-way drainage valve 133 and the one-way water inlet valve 163, utilizes the characteristics of the reciprocating thread to drive the periodic up-and-down movement of the conveying ring plate 161, realizing the automatic conveying of the recovered liquid, enabling the recovered liquid at the bottom to be sucked and conveyed to the spray pipe 12 for spraying;

[0057] Please refer to Figure 1 , in this embodiment, a driving motor 15 is provided on one side of the recovery tower 1, and a synchronous chain 151 is connected between the output end of the driving motor 15 and the rotating shaft 13.

[0058] Please refer to Figure 5 、 Figure 6 , in this embodiment, positioning shafts 143 fixedly connected are provided in the middle of both sides of the rotating frame 145. The positioning shafts 143 are rotationally and sealingly connected to the recovery holes 141. A plurality of adjustment grooves 1443 corresponding to the recovery holes 141 are provided in the recovery plate 14. An adjustment plate 144 is slidably connected in the adjustment grooves 1443. The end of the positioning shaft 143 is located in the adjustment groove 1443, and a gear 1431 fixedly connected is provided at the end of the positioning shaft 143. A rack 1441 meshing with the gear 1431 is provided on the adjustment plate 144. A hydraulic rod 1442 fixedly connected and used to drive the adjustment plate 144 to move up and down is provided in the adjustment groove 1443.

[0059] The design of the adjustment plate 144, the gear 1431, the rack 1441 and the hydraulic rod 1442 can realize the rotation control of the rotating frame 145 through the up-and-down movement of the adjustment plate 144, so that always one rotating frame 145 is in a horizontal state and one rotating frame 145 is in a vertical state.

[0060] Please refer to Figure 6 、 Figure 7 、 Figure 8 , in this embodiment, sliding grooves 1452 are provided on the inner walls of the rotating frames 145 on both sides of the adsorption cotton 142. The extrusion plate 146 is slidably connected to the sliding grooves 1452. A return spring 1462 fixedly connected and used to drive the extrusion plate 146 to return to the initial position is provided at one end of the sliding groove 1452. The return spring 1462 is fixedly connected to one end of the extrusion plate 146. Flexible connectors 1461 are provided at both ends of the extrusion plate 146. The connectors 1461 are arranged in the sliding grooves 1452, and the extended ends of the connectors 1461 movably pass through the ends of the sliding grooves 1452 and are fixedly connected to the inner walls of the recovery holes 141.

[0061] The design of the connecting member 1461, the sliding groove 1452 and the return spring 1462 enables the rotating frame 145 to drive the pressing plate 146 to move automatically through the pulling force of the connecting member 1461 when rotating, so as to automatically press the adsorption cotton 142.

[0062] Please refer to Figure 6 、 Figure 7 、 Figure 8 In this embodiment, symmetrically distributed storage grooves 1471 are provided at one end of the rotating frame 145. A storage shaft 1472 is rotatably connected in the storage groove 1471. A sealing belt 147 is evenly wound on the storage shaft 1472, and a tape spring for automatically retracting and winding the sealing belt 147 is provided on the storage shaft 1472. The extending end of the sealing belt 147 movably passes through the side wall of the storage groove 1471 and is fixedly connected to the corresponding pressing plate 146. An overflow groove 1451 for the outflow of liquid after extrusion is provided at the other end of the rotating frame 145. A discharge groove communicating with the overflow groove 1451 is provided in the recovery plate 14.

[0063] The design of the sealing belt 147 and the tape spring enables the pressing plate 146 to drive the sealing belt 147 to unfold while pressing the adsorption cotton 142, so that the sealing belt 147 seals the adsorption cotton 142, effectively preventing the adsorption cotton 142 from contacting the liquid when not adsorbing, thereby reducing the adsorption force of the adsorption cotton 142 when placed horizontally. Such a design can ensure that the adsorption cotton 142 has the maximum adsorption capacity each time it is placed horizontally, ensuring the adsorption of the liquid in the waste gas by the adsorption cotton 142.

[0064] When this application is in use:

[0065] First, start the driving motor 15 to drive the rotating shaft 13 to rotate. Due to the transmission of the worm gear 171 and the worm 17, and the fixed connection between the worm gear 171 and the recovery tower 1, when the rotating shaft 13 drives the worm 17 to rotate synchronously, it can also drive the worm 17 to rotate self - synchronously, thereby driving the synchronous shaft 175 to rotate self - synchronously. Under the gear transmission of the first bevel gear 176 and the second bevel gear 178, the rotating pipe 111 and the flow - equalizing pipe 11 are driven to rotate synchronously;

[0066] At this time, start the intake air blower 2 to introduce the waste gas into the intake air ring groove through the connecting pipe 22, then enter the second hole 174 through the first hole 132, then enter the third hole 1791, then enter the fourth hole through the connecting ring groove 1721, and finally enter the flow - equalizing pipe 11 through the adapter 177 and enter the recovery liquid in the form of bubbles through the flow - equalizing holes;

[0067] While the rotating shaft 13 is rotating, due to the characteristics of the reciprocating thread, the adjusting ring plate can be driven to move up and down periodically. In cooperation with the one-way water inlet valve 163 and the one-way drain valve 133, the recovered liquid in the recovery tower 1 can be sucked and conveyed into the spray pipe 12, and the gas coming out of the recovered liquid can be spray-absorbed again by spraying, which can further improve the absorption rate.

[0068] The gas after spray absorption enters the recovery hole 141. After the liquid in the gas is adsorbed by the adsorption cotton 142, it is discharged. When one of the adsorption cottons 142 has adsorbed for a certain time and reaches the adsorption saturation, the hydraulic rod 1442 is controlled to drive the adjusting plate 144 to move. Through gear transmission, the two rotating frames 145 up and down in the recovery hole 141 are driven to rotate synchronously, so that the unadsorbed rotating frame 145 rotates from the vertical state to the horizontal state for adsorption. When the rotating frame 145 rotates to the horizontal state, the connecting piece 1461 will automatically pull the pressing plate 146 to automatically return to the initial position (i.e., move to one end of the storage tank 1471), and the seal will automatically return to the storage tank 1471 under the action of the ruler spring, so that the adsorption cotton 142 in the rotating frame 145 automatically opens for adsorption.

[0069] During the process of the adsorption-saturated adsorption cotton 142 rotating from the horizontal state to the vertical state, due to the loosening of the connecting piece 1461 and the elasticity of the return spring 1462, the pressing plate 146 can be automatically driven to move towards the overflow groove 1451. The liquid separated by extrusion can be collected through the overflow groove 1451 and recovered into the recovery tower 1 during the movement of the pressing plate 146. At the same time, the pressing plate 146 can also drive the sealing belt 147 to automatically unfold, so as to seal the adsorption cotton 142, which can effectively prevent the liquid from entering the adsorption cotton 142 and affecting the adsorption efficiency of the adsorption cotton 142, thus ensuring that the best adsorption state is always maintained every time the adsorption cotton 142 is placed horizontally.

[0070] Example 2, the same parts as in Example 1 will not be described. The differences from Example 1 are as follows: Please refer to Figure 9 、 Figure 10, the recovery holes 141 are radially symmetrically distributed on the recovery plate 14; a telescopic tube 1444 is fixedly connected to the bottom of the adjustment groove 1443, and the extending end of the telescopic tube 1444 is fixedly connected to the adjustment plate 144. A pressing and telescopic mechanism 1448 is fixedly connected to the recovery plate 14 below the recovery holes 141. A pressing rod 1449 is fixedly connected to the bottom pressing end of the pressing and telescopic mechanism 1448. The end of the pressing rod 1449 is hemispherical. The rotation of the spray pipe 12 contacts the end of the pressing rod 1449 and drives the pressing rod 1449 to press. A top rod 1447 is fixedly connected to the telescopic end at the upper end of the pressing and telescopic mechanism 1448. A driving groove 1445 is provided below the adjustment groove 1443. A driving plate 1446 is slidably and sealingly connected in the driving groove 1445. The end of the top rod 1447 movably passes through the driving groove 1445 and is fixedly connected to the driving plate 1446. The other end of the driving groove 1445 is provided with a driving pipe communicating with the telescopic tube 1444, and a driving liquid is provided in the driving groove 1445. The pressing and telescopic mechanism 1448 adopts the pressing and telescopic mechanism 1448 in the field of pressing ballpoint pens.

[0071] The design of the position of the recovery holes 141, combined with the combination of the pressing and telescopic mechanism 1448, the pressing rod 1449, the spray pipe 12 and the telescopic tube 1444, enables the spray pipe 12 to press the pressing rod 1449 during rotation. Due to the characteristics of the pressing and telescopic mechanism 1448, the top rod 1447 can be driven to rise after pressing, and the top rod 1447 can be driven to descend by pressing again. In this way, through the hydraulic transmission of the driving groove 1445, the back-and-forth adjustment of the telescopic tube 1444 is realized, thus realizing the automatic control of the rotation of the rotating frame 145 and reducing the cost of adding the hydraulic rod 1442 originally required;

[0072] The design of the driving plate 1446, the driving groove 1445 and the telescopic tube 1444 can drive the telescopic tube 1444 to extend a longer distance by moving a small distance of the driving plate 1446 due to the different diameters. This design can realize the telescopic control of the length of the telescopic tube 1444 only by pressing the pressing and telescopic mechanism 1448, and can realize the rotation control of the rotating frame 145;

[0073] In this embodiment, the spray pipes 12 are distributed in a staggered up-and-down manner. One or two spray pipes 12 can be arranged on one side of the pressing rod 1449, and the other spray pipes 12 are located below the pressing rod 1449. This design can press the pressing rod 1449 through the rotation of the spray pipes 12, and at the same time can reduce the pressing interval of the spray pipes 12 on the pressing rod 1449, ensuring that each adsorption cotton 142 can be fully adsorbed before flipping.

[0074] In the use of this embodiment:

[0075] While the spray pipe 12 rotates, the spray pipe 12 at the upper end will successively contact the pressing rod 1449 and press the pressing rod 1449 in sequence. After the pressing rod 1449 is pressed, the ejector rod 1447 is driven to rise through the pressing telescopic mechanism 1448, thereby driving the driving plate 1446 to move. The hydraulic transmission drives the telescopic rod to automatically extend, thereby driving the adjusting plate 144 to move, realizing the rotation control of the rotating frame 145; as long as the rotation speed of the spray pipe 12 is controlled, the flipping frequency of the rotating frame 145 can be increased or shortened, so as to ensure that the adsorption cotton 142 can be fully adsorbed.

[0076] A control method for an NMP recovery device for lithium batteries based on PLC control, using the NMP recovery device for lithium batteries based on PLC control, includes the following steps:

[0077] S1 First, control the intake fan 2 to suck the waste gas through the intake pipe 21 and transport it into the flow equalizing pipe 11, and flow out through the flow equalizing holes. Since the flow equalizing pipe 11 is located below the liquid level of the recovery liquid, the waste gas flowing out of the flow equalizing holes enters the recovery liquid in the form of bubbles, enabling the recovery liquid to preliminarily absorb the waste gas;

[0078] S2 At the same time, control the rotation of the rotating shaft 13, so that the synchronous shaft 175 rotates synchronously with the rotating shaft 13 and the rotating pipe 111, and the rotating pipe 111 rotates, so that the flow equalizing pipe 11 rotates in the recovery liquid. The rotation of the flow equalizing pipe 11 can drive the recovery liquid to stir, enabling the waste gas to contact the recovery liquid more fully;

[0079] S3 Then control the conveying mechanism to convey the recovery liquid through the conveying mechanism to the spray pipe 12 and spray it out, so that the rising waste gas can contact the spray-shaped recovery liquid again, and the waste gas is adsorbed and recovered again;

[0080] S4 The gas after spray adsorption enters the recovery hole 141. The liquid in the gas is adsorbed and recovered by the adsorption cotton 142 and then discharged. By controlling the rotation of the upper and lower rotating frames 145, it can be ensured that there is always an adsorption cotton 142 lying horizontally in the recovery hole 141, ensuring that the recovery hole 141 can fully adsorb and recover the liquid in the rising air flow.

[0081] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" in describing a combination shall include the identified elements, ingredients, components or steps as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe the combinations of elements, ingredients, components or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components or steps. By using the term "may" herein, it is intended that any of the attributes described as "may" include are optional.

[0082] A plurality of elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step can be separated into discrete plural elements, ingredients, components or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step does not mean to exclude other elements, ingredients, components or steps.

[0083] It should be understood that the above description is for purposes of illustration and not limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present application should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which those claims are entitled. For completeness, all articles and references including patent applications and published disclosures are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not a waiver of that subject matter, nor should it be considered that the inventor has not considered that subject matter to be part of the disclosed inventive subject matter.

Claims

1. NMP recovery equipment for lithium batteries based on PLC control, characterized by: The invention comprises a recovery tower, wherein the recovery liquid is stored in the recovery tower, and a rotatable rotating shaft is arranged in the middle of the recovery tower, a plurality of synchronous shafts which can rotate synchronously with the rotating shaft are arranged on the outer side of the rotating shaft, a plurality of rotatable rotating tubes are arranged at the bottom of the synchronous shaft, a fixedly connected air intake disk is arranged at the bottom of the rotating shaft, a plurality of fixedly connected flow equalizing tubes are arranged on the outer side of the air intake disk, a plurality of flow equalizing holes are arranged on the flow equalizing tube, the flow equalizing tube is located below the recovery liquid level, an air intake fan is arranged on one side of the recovery tower, an air intake pipe is arranged at the air intake end of the air intake fan, and the output end of the air intake fan is connected with the flow equalizing tube, A guide plate is provided at the upper end of the rotating shaft, and a plurality of spray pipes are provided on the guide plate. A conveying mechanism for conveying the recovered liquid to the spray pipe is provided in the recovery tower. An exhaust pipe is provided at the upper end of the recovery tower. A fixedly connected recovery plate is provided in the recovery tower below the exhaust pipe. A plurality of evenly distributed and through-type recovery holes are provided on the recovery plate. Two rotatable rotating frames are provided in the recovery holes, and the upper and lower rotating frames are arranged in a T shape. Adsorption cotton for adsorbing the recovered liquid is provided in the rotating frame, and an extrusion plate that can move back and forth and is used for extruding the adsorption cotton is also provided in the rotating frame; A fixedly connected positioning shaft is provided at the middle of both sides of the rotating frame, and the positioning shaft is rotatably and sealedly connected to the recovery hole. A plurality of adjustment grooves corresponding to the recovery holes are provided in the recovery plate, and a slidingly connected adjustment plate is provided in the adjustment groove. The end of the positioning shaft is located in the adjustment groove, and a fixedly connected gear is provided at the end of the positioning shaft. A rack meshing with the gear is provided on the adjustment plate, and a fixedly connected hydraulic rod for driving the adjustment plate to move up and down is provided in the adjustment groove; The inner wall of the rotating frame located on both sides of the adsorbent cotton is provided with a slide groove, the extrusion plate is slidably connected to the slide groove, one end of the slide groove is provided with a reset spring fixedly connected and used to drive the extrusion plate to return to the initial position, the reset spring is fixedly connected to one end of the extrusion plate, and both ends of the extrusion plate are provided with bendable connecting pieces, the connecting piece is arranged in the slide groove, and the extending end of the connecting piece movably passes through the end of the slide groove and is fixedly connected to the inner wall of the recovery hole; One end of the rotating frame is provided with symmetrically distributed storage grooves, a rotatably connected storage shaft is provided in the storage groove, a uniformly wound sealing belt is provided on the storage shaft, and a ruler spring for automatically recovering and winding the sealing belt is provided on the storage shaft, the extended end of the sealing belt movably passes through the side wall of the storage groove and is fixedly connected to the corresponding extrusion plate, the other end of the rotating frame is provided with an overflow groove for the liquid to flow out after extrusion, and a discharge groove connected to the overflow groove is provided in the recovery plate.

2. The NMP recovery equipment for lithium batteries based on PLC control according to claim 1, characterized in that: A fixedly connected worm wheel is provided at the bottom of the recovery tower, and the rotating shaft rotates through the middle of the worm wheel. A worm matched with the worm wheel is provided on the synchronous shaft, and a rotatable and sealed sleeve is provided on the synchronous shaft at both ends of the worm. A first fixed plate fixedly connected is provided on the sleeve, and a second fixed plate fixedly connected to the rotating shaft is provided on the first fixed plate. The rotating tube and the sleeve are rotatably connected, and a first bevel gear fixedly connected is provided on both ends of the synchronous shaft, and a second bevel gear fixedly connected and meshing with the first bevel gear is provided on the rotating tube.

3. The NMP recovery equipment for lithium batteries based on PLC control according to claim 2, characterized in that: The outer side of the rotating shaft is provided with an intake ring plate that rotates and is sealed, the inner side wall of the intake ring plate is provided with an intake ring groove, the output end of the intake fan is provided with a connecting pipe connected with the intake ring groove, the rotating shaft is provided with a first hole connected with the intake ring groove, the second fixed plate is provided with a second hole connected with the first hole, the first fixed plate is provided with a third hole connected with the second hole, the inner wall of the sleeve is provided with a connecting ring groove, the third hole is connected with the connecting ring groove, the synchronous shaft is provided with a fourth hole, one end of the fourth hole is connected with the third hole, the sleeve is provided with a transfer tube, one end of the transfer tube is rotatably and sealably connected to the synchronous shaft, the transfer tube is connected to the fourth hole, the other end of the transfer tube is rotatably and sealably connected to the corresponding rotating tube, and the intake disk is connected to the rotating tube.

4. The NMP recovery equipment for lithium batteries based on PLC control according to claim 1, characterized in that: The air inlet disc is fixedly arranged at the end of the rotating tube in an inclined shape.

5. The NMP recovery equipment for lithium batteries based on PLC control according to claim 1, characterized in that: The conveying mechanism includes a conveying ring plate and a conveying ring groove. A fixedly connected fixed ring plate is provided at the bottom of the recovery tower. The fixed ring plate is fixedly connected to the worm gear, and the fixed ring plate is rotatably and sealedly connected to the rotating shaft. A prismatic conveying ring groove is provided on the inner wall of the fixed ring plate. A reciprocating thread is provided on the rotating shaft located inside the conveying ring groove. A slidable and sealed conveying ring plate is provided in the conveying ring groove. The conveying ring plate is matched with the reciprocating thread. A water inlet is provided on the side wall of the conveying ring groove. A one-way water inlet valve is provided in the water inlet. A drain hole is provided on the rotating shaft. A one-way drain valve is provided in the drain hole, and an extending end of the drain hole is connected to the guide plate.

6. The NMP recovery equipment for lithium batteries based on PLC control according to claim 1, characterized in that: A driving motor is provided at one side of the recovery tower, and a synchronous chain connected to the output end of the driving motor is provided between the rotating shaft.

7. A control method for a lithium battery NMP recovery device based on PLC control, using the lithium battery NMP recovery device based on PLC control as described in any one of claims 1 to 6, characterized in that: The following steps are involved: S1 first controls the air intake fan to suck the waste through the air intake pipe, and transports it to the flow equalizing pipe, and flows out through the flow equalizing hole. Since the flow equalizing pipe is located below the liquid level of the recovery liquid, the waste gas flowing out of the flow equalizing hole enters the recovery liquid in the form of bubbles, so that the recovery liquid performs preliminary absorption of the waste gas; S2 simultaneously controls the rotation of the rotating shaft, so that the synchronous shaft rotates synchronously with the rotating shaft and the rotating tube, and the rotating tube rotates, so that the flow equalizing tube is in a rotating state in the recovery liquid. The rotation of the flow equalizing tube can drive the recovery liquid to stir, so that the exhaust gas can be more fully in contact with the recovery liquid; S3 then controls the conveying mechanism to convey the recovery liquid to the spray pipe through the conveying mechanism and spray it out, so that the rising waste gas can contact the spray-like recovery liquid again, and the waste gas is adsorbed and recovered again; The gas after spraying adsorption by S4 enters the recovery hole, and the liquid in the gas is adsorbed and recovered by the adsorption cotton and then discharged. By controlling the rotation of the upper and lower rotating frames, there can always be an adsorption cotton horizontally in the recovery hole, ensuring that the recovery hole can fully adsorb and recover the liquid in the rising airflow.

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