Lithium battery NMP recovery equipment based on PLC control and control method

Abstract

The invention discloses a lithium battery NMP (N-Methyl Pyrrolidone) recovery device based on PLC (Programmable Logic Controller) control, which comprises a recovery tower, recovery liquid is stored in the recovery tower, a rotatable rotating shaft is arranged in the middle of the recovery tower, a plurality of synchronizing shafts are arranged on the outer side of the rotating shaft, a plurality of rotating pipes are arranged at the bottoms of the synchronizing shafts, an air inlet disc is arranged at the bottom of the rotating shaft, and a plurality of flow equalizing pipes are arranged on the outer side of the air inlet disc. A plurality of flow equalizing holes are formed in the flow equalizing pipe, an air inlet fan is arranged on one side of the recovery tower, the output end of the air inlet fan is communicated with the flow equalizing pipe, a plurality of spraying pipes are arranged at the upper end of the rotating shaft, a fixedly connected recovery plate is arranged in the recovery tower, a plurality of through recovery holes which are uniformly distributed are formed in the recovery plate, and two rotatable rotating frames are arranged in each recovery hole; adsorption cotton is arranged in the rotating frame, and an extrusion plate is further arranged in the rotating frame. And through the design of the rotating pipe and the flow equalizing pipe, waste gas can enter the recovery liquid in a bubble shape, so that the contact probability of the waste gas and the recovery liquid can be improved, and the recovery rate of substances in the waste gas is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of NMP recovery, and in particular relates to NMP recovery equipment for lithium batteries based on PLC control and a control method. Background Art

[0002] NMP, full name N-methylpyrrolidone, is a liquid formed by condensation of γ-butyrolactone with methylamine. It is highly volatile and permeable, with an alkaline pH of 7-9. It is flammable and explosive. It is widely used in lithium battery production. In the process of manufacturing lithium battery electrodes, high-temperature NMP waste gas is generated. Since NMP is toxic and expensive, it is generally recycled after preparing lithium batteries. At present, when recycling NMP waste gas generated in the process of lithium battery manufacturing, it is mainly recycled in the following ways:

[0003] Plate Heat Recovery Unit: Through plate heat exchange technology, this equipment can recover heat from exhaust 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 exhaust gas.

[0005] High tower: The water washing tower uses physical absorption to wet the packing with process water, so that the waste gas and process water are fully contacted and fused on the packing, thereby recovering NMP.

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

[0007] The inventors have found that when existing absorption towers perform secondary recovery of waste gas, they usually only recycle the waste gas through a simple spray absorption method. This reduces the absorption efficiency of the waste gas by the absorption tower, and it is easy for the waste gas to be discharged without being treated to meet the standards, causing air pollution and easily resulting in the loss of raw materials.

[0008] Therefore, the existing structure and defects are studied and improved, and a NMP recovery device and control method for lithium batteries based on PLC control are provided, in order to achieve a more practical purpose. Summary of the invention

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

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

[0011] The NMP recovery equipment for lithium batteries based on PLC control comprises a recovery tower, wherein the recovery tower stores recovery liquid, and a rotatable rotating shaft is provided in the middle of the recovery tower, a plurality of synchronous shafts that can rotate synchronously with the rotating shaft are provided on the outer side of the rotating shaft, a plurality of rotatable rotating tubes are provided at the bottom of the synchronous shaft, a fixedly connected air intake disk is provided at the bottom of the rotating shaft, a plurality of fixedly connected flow equalizing tubes are provided on the outer side of the air intake disk, a plurality of flow equalizing holes are provided on the flow equalizing tube, the air intake pipe is located below the recovery liquid level, an air intake fan is provided on one side of the recovery tower, an air intake pipe is provided at the air intake end of the air intake fan, and the output of the air intake fan The end is connected with the flow equalizing pipe, the upper end of the rotating shaft is provided with a guide plate, the guide plate is provided with a plurality of spray pipes, the recovery tower is provided with a conveying mechanism for conveying the recovery to the spray pipe, the upper end of the recovery tower is provided with an exhaust pipe, the recovery tower located below the exhaust pipe is provided with a fixedly connected recovery plate, the recovery plate is provided with a plurality of evenly distributed and through-type recovery holes, the recovery holes are each provided with two rotatable rotating frames, the upper and lower rotating frames are distributed in a T shape, the rotating frame is provided with adsorption cotton for adsorbing the recovery liquid, and the rotating frame is also provided with an extrusion plate that can move back and forth and is used for extruding the adsorption cotton.

[0012] Preferably, a fixedly connected worm gear is provided at the bottom of the recovery tower, the rotating shaft rotates and passes through the middle of the worm gear, the synchronous shaft is provided with a worm matched with the worm gear, the synchronous shaft located at both ends of the worm is provided with a rotatable and sealingly connected sleeve, the sleeve is provided with a fixedly connected first fixed plate, the first fixed plate is provided with a second fixed plate fixedly connected to the rotating shaft, the rotating tube and the sleeve are rotatably connected, the two ends of the synchronous shaft are provided with a fixedly connected first bevel gear, and the rotating tube is provided with a second bevel gear fixedly connected and meshing with the first bevel gear.

[0013] Preferably, a rotatable and sealed air intake ring plate is provided on the outer side of the rotating shaft, an air intake ring groove is provided on the inner side wall of the air intake ring plate, a connecting pipe connected to the air intake ring groove is provided on the output end of the air intake fan, a first hole connected to the air intake ring groove is provided on the rotating shaft, a second hole connected to the first hole is provided inside the second fixed plate, a third hole connected to the second hole is provided in the first fixed plate, a connecting ring groove is provided on the inner wall of the sleeve, the third hole is connected to the connecting ring groove, a fourth hole is provided in the synchronous shaft, one end of the fourth hole is connected to the third hole, a transfer tube is provided in the sleeve, one end of the transfer tube is rotatably and sealedly connected to the synchronous shaft, the transfer tube is connected to the fourth hole, the other end of the transfer tube is rotatably and sealedly connected to the corresponding rotating tube, and the air intake disk is connected to the rotating tube.

[0014] Preferably, the air inlet disc is fixedly arranged at the end of the rotating tube in an inclined shape.

[0015] Preferably, 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 sliding 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 the extending end of the drain hole is connected to the guide plate.

[0016] Preferably, a driving motor is provided on 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.

[0017] Preferably, a fixedly connected positioning shaft is provided in the middle of both sides of the rotating frame, 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, 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.

[0018] Preferably, a slide groove is provided on the inner wall of the rotating frame on both sides of the adsorption cotton, the extrusion plate is slidably connected to the slide groove, one end of the slide groove is provided with a return spring which is fixedly connected and used to drive the extrusion plate to restore the initial position, the return 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 is movably passed through the end of the slide groove and is fixedly connected to the inner wall of the recovery hole.

[0019] Preferably, 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.

[0020] The control method of the NMP recovery equipment for lithium batteries based on PLC control adopts the NMP recovery equipment for lithium batteries based on PLC control, and comprises the following steps:

[0021] 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;

[0022] 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;

[0023] 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;

[0024] 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.

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

[0026] The design of the rotating tube and the equalizing tube allows the waste gas to enter the recovery liquid in the form of bubbles. This design can further increase the contact probability between the waste gas and the recovery liquid, thereby increasing the recovery rate of the substances in the waste gas. At the same time, the rotating design of the rotating tube can make the incoming gas rotate. This design can more effectively increase the contact between the waste gas and the recovery liquid in the recovery tower, thereby further increasing the recovery efficiency of the substances in the waste gas. The rotating state of the rotating shaft can also stir the recovery liquid, which can effectively prevent the accumulation of materials at the bottom of the recovery tower.

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

[0028] The design of the rotating frame and the adsorption cotton can ensure that there is always an adsorption cotton placed horizontally in the recovery hole through the rotatable design of the rotating frame, so that the waste gas passing through the recovery hole can be fully adsorbed and recovered by the adsorption cotton, thereby improving the absorption rate of the recovery hole for the waste liquid in the airflow; the design of the extrusion plate can make the vertical adsorption cotton squeeze out the waste liquid under the action of the extrusion plate when not filtering, thereby ensuring that the adsorption cotton can be fully absorbed when used again.

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

[0030] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner 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 “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure provided in Example 1 of the present invention.

[0034] Figure 2 This is a schematic diagram of the three-dimensional connection structure between the rotating shaft and the flow equalizing tube provided in Example 1 of the present invention.

[0035] Figure 3 This is a schematic diagram of the cross-sectional connection structure of the rotating shaft and the fixed ring plate provided in Example 1 of the present invention.

[0036] Figure 4 This is a schematic diagram of the cross-sectional connection structure of the sleeve and the synchronous shaft provided in Example 1 of the present invention.

[0037] Figure 5 This is a schematic diagram of the cross-sectional structure of the recovery hole provided in Example 1 of the present invention.

[0038] Figure 6 This is a schematic diagram of the three-dimensional connection structure between the rotating frames provided in Example 1 of the present invention.

[0039] Figure 7 This is a schematic diagram of the cross-sectional structure of the rotating frame provided in Example 1 of the present invention.

[0040] Figure 8 This is a schematic diagram of the three-dimensional connection structure of the extruded plate and the sealing belt provided in Example 1 of the present invention.

[0041] Fig. 9This is a schematic diagram of the top view structure of the recovery hole provided in Example 2 of the present invention.

[0042] Fig.10 This is a schematic diagram of the cross-sectional structure of the recovery hole provided in Example 2 of the present invention.

[0043] Explanation of the numbers in the figure: 1. Recovery tower; 11. Flow equalizing pipe; 111. Rotating pipe; 12. Spraying pipe; 121. Guide plate; 13. Rotating shaft; 131. Drain hole; 132. First hole; 133. One-way drain 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 slot; 1444. Telescopic pipe; 1445. Driving slot; 1446. Driving plate; 1447. Push rod; 1448. Pressing telescopic mechanism; 1449. Pressing rod; 145. Rotating frame; 1451. Overflow slot; 1452. Slide slot; 146. Extrusion plate; 1461, connecting piece; 1462, return spring; 147, sealing belt; 1471, storage groove; 1472, storage shaft; 15, driving motor; 151, synchronous chain; 16, fixed ring plate; 161, conveying ring plate; 162, conveying ring groove; 163, one-way water inlet valve; 17, worm; 171, worm wheel; 172, sleeve; 1721, connecting ring groove; 173, second fixed plate; 174, second hole; 175, synchronous shaft; 176, first bevel gear; 177, transfer tube; 178, second bevel gear; 179, first fixed plate; 1791, third hole; 2, intake fan; 21, intake pipe; 22, connecting pipe; 23, intake ring plate. DETAILED DESCRIPTION

[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 drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

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

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

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

[0048] The design of the rotating tube 111 and the equalizing tube 11 allows the waste gas to enter the recovery liquid in the form of bubbles. This design can further increase the contact probability between the waste gas and the recovery liquid, thereby increasing the recovery rate of the substances in the waste gas. At the same time, the rotating design of the rotating tube 111 can make the entering gas rotate. This design can more effectively increase the contact between the waste gas and the recovery liquid in the recovery tower 1, thereby further increasing the recovery efficiency of the substances in the waste gas. The rotating state of the rotating shaft 13 can also stir the recovery liquid, which can effectively prevent 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 can realize the rotary spraying of the recovery liquid, which can more fully increase the contact probability between the recovery liquid and the waste gas, thereby increasing the recovery rate of the 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, so that the waste gas passing through the recovery hole 141 can be fully adsorbed and recovered by the adsorption cotton 142, thereby improving the absorption rate of the waste liquid in the airflow by the recovery hole 141; the design of the extrusion plate 146 can make the vertical adsorption cotton 142 squeeze out the waste liquid under the action of the extrusion plate 146 when not filtering, thereby ensuring that the adsorption cotton 142 can be fully absorbed when used again.

[0051] See also Figure 2 and Figure 4 In this embodiment, a fixedly connected worm wheel 171 is provided at the bottom of the recovery tower 1, and the rotating shaft 13 rotates through the middle of the worm wheel 171. A worm 17 matching and connected to the worm wheel 171 is provided on the synchronous shaft 175. A rotatable and sealed sleeve 172 is provided on the synchronous shaft 175 at both ends of the worm 17. A first fixed plate 179 is fixedly connected to the sleeve 172. A second fixed plate 173 fixedly connected to the rotating shaft 13 is provided on the first fixed plate 179. The rotating tube 111 is rotatably connected to the sleeve 172. A first bevel gear 176 fixedly connected to the two ends of the synchronous shaft 175 is provided. A second bevel gear 178 fixedly connected and meshing with the first bevel gear 176 is provided on the rotating tube 111.

[0052] The design of the worm gear 171, worm 17, sleeve 172, synchronous shaft 175, first bevel gear 176 and second bevel gear 178 can realize the synchronous rotation of the synchronous shaft 175 driven by the rotation of the rotating shaft 13, and also realize the self-rotation of the rotating tube 111 through the meshing transmission of the gears, thereby realizing the rotation of the flow equalizing tube 11 in the recovery liquid.

[0053] See also Figure 2 , Figure 3 , Figure 4In this embodiment, the outer side of the rotating shaft 13 is provided with an intake ring plate 23 that is rotatable and sealed, the inner side wall of the intake ring plate 23 is provided with an intake ring groove, the output end of the intake fan 2 is provided with a connecting pipe 22 connected to the intake ring groove, the rotating shaft 13 is provided with a first hole 132 connected to the intake ring groove, the second fixing plate 173 is provided with a second hole 174 connected to the first hole 132, the first fixing plate 179 is provided with a third hole 1791 connected to the second hole 174, the sleeve 172 A connecting annular groove 1721 is provided on the inner wall, the third hole 1791 is connected to the connecting annular groove 1721, a fourth hole is provided in the synchronization shaft 175, one end of the fourth hole is connected to the third hole 1791, a transfer tube 177 is provided in the sleeve 172, one end of the transfer tube 177 is rotatably and sealedly connected to the synchronization shaft 175, and the transfer tube 177 is connected to the fourth hole, the other end of the transfer tube 177 is rotatably and sealedly connected to the corresponding rotating tube 111, and the air intake plate is connected to the rotating tube 111. The design of the first hole 132, the second hole 174, the third hole 1791 and the fourth hole enables the rotating tube 111 to realize the rotation of the equalizing tube 11 while ensuring the transportation of the exhaust gas;

[0054] In this embodiment, the air intake disk is fixedly arranged in an inclined shape at the end of the rotating tube 111. The inclined design of the air intake disk enables the equalizing tube 11 to rotate around the rotating tube 111. Due to the height difference between the equalizing tubes 11, the equalizing tube 11 can also better stir the recovery liquid, and the equalizing tube 11 at the upper end can also disperse the rising bubbles generated by the equalizing tube 11 at the bottom during the movement, thereby further improving the contact probability between the exhaust gas and the recovery liquid, thereby effectively improving the recovery rate of the recovery liquid to the exhaust gas.

[0055] See also Figure 2 , Figure 3 In this embodiment, the conveying mechanism includes a conveying ring plate 161 and a conveying ring groove 162. A fixedly connected fixed ring plate 16 is provided at the bottom of the recovery tower 1. The fixed ring plate 16 is fixedly connected to the worm gear 171, and the fixed ring plate 16 is rotatably and sealedly 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 sliding and sealed conveying ring plate 161 is provided in the conveying ring groove 162. The conveying ring plate 161 is matched 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 an extending end of the drain hole 131 is communicated with the guide plate 121.

[0056] The design of the conveying ring plate 161 and the conveying ring groove 162 cooperates with the one-way drain valve 133 and the one-way water inlet valve 163, and utilizes the characteristics of the reciprocating thread to drive the conveying ring plate 161 to move up and down periodically, thereby realizing the automatic conveying of the recovered liquid, so that the recovered liquid at the bottom can be sucked and conveyed to the spray pipe 12 for spraying;

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

[0058] See also Figure 5 , Figure 6 In this embodiment, a fixedly connected positioning shaft 143 is provided in the middle of both sides of the rotating frame 145, and the positioning shaft 143 is rotatably and sealedly connected to the recovery hole 141. A plurality of adjustment grooves 1443 corresponding to the recovery hole 141 are provided in the recovery plate 14, and a slidingly connected adjustment plate 144 is provided in the adjustment groove 1443. The end of the positioning shaft 143 is located in the adjustment groove 1443, and a fixedly connected gear 1431 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, and 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 there is always one rotating frame 145 in a horizontal state and one rotating frame 145 in a vertical state.

[0060] See also Figure 6 , Figure 7 , Figure 8 In the present embodiment, a slide groove 1452 is provided on the inner wall of the rotating frame 145 located on both sides of the adsorbent cotton 142, and the extrusion plate 146 is slidably connected to the slide groove 1452. One end of the slide groove 1452 is provided with a return spring 1462 which is fixedly connected and used to drive the extrusion plate 146 to restore the initial position. The return spring 1462 is fixedly connected to one end of the extrusion plate 146, and both ends of the extrusion plate 146 are provided with a bendable connecting piece 1461, which is arranged in the slide groove 1452, and the extending end of the connecting piece 1461 movably passes through the end of the slide groove 1452 and is fixedly connected to the inner wall of the recovery hole 141.

[0061] The design of the connecting member 1461, the slide groove 1452 and the return spring 1462 can enable the rotating frame 145 to drive the squeezing plate 146 to move through the pulling force of the connecting member 1461 when the rotating frame 145 rotates, thereby driving the squeezing plate 146 to move automatically, thereby automatically squeezing the adsorption cotton 142.

[0062] See also Figure 6 , Figure 7 , Figure 8 In this embodiment, one end of the rotating frame 145 is provided with symmetrically distributed storage grooves 1471, and a rotatably connected storage shaft 1472 is provided in the storage groove 1471. A uniformly wound sealing belt 147 is provided on the storage shaft 1472, and a ruler spring for automatically recovering and winding the sealing belt 147 is provided on the storage shaft 1472. The extended end of the sealing belt 147 moves through the side wall of the storage groove 1471 and is fixedly connected to the corresponding extrusion plate 146. The other end of the rotating frame 145 is provided with an overflow groove 1451 for the liquid to flow out after extrusion, and a discharge groove connected to the overflow groove 1451 is provided in the recovery plate 14.

[0063] The design of the sealing belt 147 and the ruler spring enables the extrusion plate 146 to drive the sealing belt 147 to expand while squeezing the adsorption cotton 142, so that the sealing belt 147 can seal the adsorption cotton 142, which can effectively prevent the adsorption cotton 142 from contacting with liquid when not adsorbing, thereby reducing the adsorption force of the adsorption cotton 142 when it is placed horizontally. Such a design can ensure that the adsorption cotton 142 has the maximum adsorption capacity each time it is placed horizontally, thereby ensuring the adsorption of liquid in the exhaust gas by the adsorption cotton 142.

[0064] When using this application:

[0065] First, the driving motor 15 is started to drive the rotating shaft 13 to rotate. Due to the transmission of the worm gear 171 and the fixed connection between the worm gear 171 and the recovery tower 1, the rotating shaft 13 can drive the worm gear 17 to rotate synchronously, and can also drive the worm gear 17 to rotate on its own, thereby driving the synchronous shaft 175 to rotate synchronously. Under the gear transmission of the first bevel gear 176 and the second bevel gear 178, the rotating tube 111 and the flow equalizing tube 11 are driven to rotate synchronously;

[0066] At this time, the intake fan 2 is started to drive the exhaust gas into the intake ring groove through the connecting pipe 22, then into the second hole 174 through the first hole 132, then into the third hole 1791, then into the fourth hole through the connecting ring groove 1721, and finally into the flow equalizing pipe 11 through the transfer pipe 177, and into the recovery liquid in the form of bubbles through the flow equalizing holes;

[0067] While the rotating shaft 13 rotates, the reciprocating thread can drive the adjusting ring plate to move up and down periodically, and cooperate with the one-way water inlet valve 163 and the one-way drain valve 133, so that the recovery liquid in the recovery tower 1 can be sucked and transported to the spray pipe 12, and the gas coming out of the recovery liquid can be sprayed and absorbed again by spraying, which can further improve the absorption rate;

[0068] The gas absorbed by the spray enters the recovery hole 141, and the liquid in the gas is absorbed by the absorption cotton 142 and then discharged. When one of the absorption cottons 142 has reached absorption saturation after absorption for a certain period of time, the hydraulic rod 1442 is controlled to drive the adjustment plate 144 to move, and through the gear transmission, the upper and lower rotating frames 145 in the recovery hole 141 are driven to rotate synchronously, so that the unabsorbed rotating frame 145 is rotated from a vertical state to a horizontal state for absorption. When the rotating frame 145 rotates to a horizontal state, the connecting member 1461 automatically pulls the extrusion plate 146 to automatically recover the initial position (i.e., move to one end of the storage tank 1471), and the sealing member is automatically recovered to the storage tank 1471 under the action of the ruler spring, so that the absorption cotton 142 in the rotating frame 145 is automatically opened for absorption;

[0069] When the saturated adsorption cotton 142 rotates from a horizontal state to a vertical state, due to the loosening of the connecting piece 1461 and the elasticity of the reset spring 1462, the extrusion plate 146 can automatically move toward the overflow groove 1451. During the movement, the extrusion plate 146 can collect the squeezed and separated liquid through the overflow groove 1451 and recycle it into the recovery tower 1. At the same time, the extrusion plate 146 can also drive the sealing belt 147 to automatically unfold, thereby sealing 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, thereby ensuring that the adsorption cotton 142 always maintains the best adsorption state every time it is placed horizontally.

[0070] Example 2, the same as Example 1 is not described here, the difference from Example 1 is: please refer to Fig. 9 , Fig.10The recovery holes 141 are symmetrically distributed on the recovery plate 14 in a radial central manner; a fixedly connected telescopic tube 1444 is provided at the bottom of the adjustment groove 1443, and the extended end of the telescopic tube 1444 is fixedly connected to the adjustment plate 144; a fixedly connected pressing and telescopic mechanism 1448 is provided on the recovery plate 14 below the recovery hole 141, and a fixedly connected pressing rod 1449 is provided at the bottom pressing end of the pressing and telescopic mechanism 1448, and the end of the pressing rod 1449 is hemispherical, and the rotation of the spray pipe 12 contacts the end of the pressing rod 1449 and drives the pressing rod 1449 to press The telescopic end at the upper end of the push-telescopic mechanism 1448 is provided with a fixedly connected push rod 1447, and a driving groove 1445 is provided below the adjusting groove 1443. A driving plate 1446 that is slidably and sealed is provided in the driving groove 1445. The end of the push 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 tube connected to the telescopic tube 1444, and a driving liquid is provided in the driving groove 1445. The push-telescopic mechanism 1448 adopts the push-telescopic mechanism 1448 in the field of push-type ballpoint pens.

[0071] The design of the position of the recovery hole 141, in conjunction 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 the rotation process, and the characteristics of the pressing and telescopic mechanism 1448 can drive the push rod 1447 to rise after being pressed, and can drive the push rod 1447 to fall by pressing again, so that the telescopic tube 1444 can be adjusted back and forth through the hydraulic transmission of the driving groove 1445, so that the automatic control of the rotation of the rotating frame 145 can be realized, reducing the cost of adding the hydraulic rod 1442;

[0072] The design of the driving plate 1446, the driving slot 1445 and the telescopic tube 1444 can make the driving plate 1446 move a short distance by the difference in diameter, so as to drive the telescopic tube 1444 to extend a longer distance. Such a design can realize the telescopic control of the length of the telescopic tube 1444 by only pressing the telescopic mechanism 1448, and can realize the rotation control of the rotating frame 145.

[0073] In this embodiment, the spray pipes 12 are staggered in the upper and lower parts, and one or two spray pipes 12 may be arranged on one side of the pressing rod 1449, and the other spray pipes 12 are arranged below the pressing rod 1449. Such a design can realize pressing of the pressing rod 1449 by rotating the spray pipes 12, and can also reduce the interval of pressing of the pressing rod 1449 by the spray pipes 12, thereby ensuring that each adsorption cotton 142 can be fully adsorbed before being flipped.

[0074] When this embodiment is used:

[0075] When the spray pipe 12 rotates, the spray pipe 12 at the upper end will contact the pressing rod 1449 in turn, and press the pressing rod 1449 in turn. After the pressing rod 1449 is pressed, the push rod 1447 is driven to rise by pressing the telescopic mechanism 1448, thereby driving the driving plate 1446 to move, and the telescopic rod is automatically extended through the hydraulic transmission, thereby driving the adjustment plate 144 to move, thereby 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, thereby ensuring that the adsorption cotton 142 can be fully adsorbed.

[0076] The control method of the NMP recovery equipment for lithium batteries based on PLC control adopts the NMP recovery equipment for lithium batteries based on PLC control, and comprises the following steps:

[0077] S1 first controls the air intake fan 2 to suck the waste through the air intake pipe 21, and transports it to the flow equalizing pipe 11, and flows out through the flow equalizing hole. 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 hole enters the recovery liquid in the form of bubbles, so that the recovery liquid performs preliminary absorption of the waste gas;

[0078] S2 simultaneously controls the rotation of the rotating shaft 13, so that the synchronous shaft 175 rotates synchronously with the rotating shaft 13 and the rotating tube 111, and the rotating tube 111 rotates, so that the flow equalizing tube 11 is in a rotating state in the recovery liquid. The rotation of the flow equalizing tube 11 can drive the recovery liquid to stir, so that the exhaust gas can be more fully in contact with the recovery liquid;

[0079] S3 then controls the conveying mechanism to convey the recovery liquid to the spray pipe 12 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;

[0080] The gas after spraying adsorption in S4 enters the recovery hole 141, and 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, there can always be an adsorption cotton 142 horizontally in the recovery hole 141, ensuring that the recovery hole 141 can fully adsorb and recover the liquid in the rising airflow.

[0081] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0082] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0083] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond 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 such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the 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 provided in the middle of the recovery tower, a plurality of synchronous shafts which can rotate synchronously with the rotating shaft are provided on the outer side of the rotating shaft, a plurality of rotatable rotating tubes are provided at the bottom of the synchronous shaft, a fixedly connected air intake disk is provided at the bottom of the rotating shaft, a plurality of fixedly connected flow equalizing tubes are provided on the outer side of the air intake disk, a plurality of flow equalizing holes are provided on the flow equalizing tube, the air intake tube is located below the recovery liquid level, an air intake fan is provided on one side of the recovery tower, an air intake pipe is provided at the air intake end of the air intake fan, and the output end of the air intake fan is connected to 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.

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. The NMP recovery equipment for lithium batteries based on PLC control according to claim 1, characterized in that: A fixedly connected positioning shaft is provided in 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.

8. The NMP recovery equipment for lithium batteries based on PLC control according to claim 7, characterized in that: Slide grooves are provided on the inner walls of the rotating frame on both sides of the adsorption cotton, and the extrusion plate is slidably connected to the slide grooves. A return spring is fixedly connected at one end of the slide groove and is used to drive the extrusion plate to return to its initial position. The return spring is fixedly connected to one end of the extrusion plate, and bendable connecting pieces are provided at both ends of the extrusion plate. 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.

9. The NMP recovery equipment for lithium batteries based on PLC control according to claim 8, characterized in that: 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.

10. 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 9, 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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