Liquid scraping device used after lithium battery diaphragm extraction

Abstract

The liquid scraping device comprises a liquid scraping roller, the liquid scraping roller is a driving roller of a hollow structure, the two ends of the liquid scraping roller are connected with rotating joints correspondingly, each rotating joint comprises an inner pipe and an outer pipe which are concentrically arranged together in a sleeving mode, and the outer pipes are assembled on the outer sides of the inner pipes in a sealed rotating mode; the inner pipe is fixedly connected with the liquid scraping roller, an inner cavity of the inner pipe is communicated with an inner cavity of the liquid scraping roller, and the outer pipe is provided with a thermal medium inlet and outlet communicated with the inner cavity of the inner pipe; one rotating joint of the liquid scraping roller is a driving rotating joint, the other rotating joint is a driven rotating joint, and an inner pipe of the driving rotating joint is connected with a driving mechanism. The liquid scraping roller is a driving roller, abrasion of a bearing is reduced, the liquid scraping roller is prevented from being stuck, the phenomenon that the liquid scraping roller does not rotate is eliminated as much as possible, and foreign matter is reduced; and a constant-temperature thermal medium is introduced into the liquid scraping roller through the rotary joint, so that the liquid scraping roller is kept at a constant temperature, and the film surface defect caused by agglutination of an oil-water mixture on the liquid scraping roller is avoided.

Description

Technical Field

[0001] The invention relates to a scraping device after extraction of a lithium battery diaphragm, belonging to the technical field of lithium battery diaphragm production. Background Art

[0002] The production process of wet-process lithium-ion battery separators generally includes: feeding, extrusion, casting, stretching, extraction, drying, pulling, winding, and slitting. After the separator is extracted, there will be a lot of extract on the separator. In the prior art, a passive scraping roller is usually used to scrape the separator. Drying is an important step in the production of lithium battery separators. The dichloromethane is dried in a drying furnace. Since the front section of the drying is the extraction section, dichloromethane will adhere to the surface of the separator after passing through the extraction section. Therefore, the first step of the drying process is to use the passive scraping roller in the drying furnace to scrape off most of the extractant from the separator. If the scraping effect is not good, the number of bright spots and bright oil spots on the membrane surface will increase. In addition, due to the contact between the separator and the passive scraping roller, friction will occur. Long-term friction will cause foreign matter to accumulate. The foreign matter scratches the surface of the separator, resulting in bright line defects on the separator, thereby affecting the quality of the separator.

[0003] Since the products produced on the production line have different thickness specifications, the position of the film surface and the doctor roller will be adjusted according to the film surface conditions during production. After the production line is stable, the position of the doctor roller will basically no longer be adjusted. However, since the doctor roller in the prior art is a passive roller, the production line personnel cannot monitor the speed of the doctor roller and cannot confirm the status of the doctor roller intuitively and specifically. The doctor roller bearing is often damaged, causing the doctor roller to stop rotating and cause bright lines.

[0004] In addition, after the diaphragm comes out of the extractant liquid surface, it not only carries dichloromethane, but also an oil-water mixture. When dichloromethane comes out of the liquid surface, it vaporizes and absorbs heat, causing the oil-water mixture to condense on the scraping roller, resulting in defects on the membrane surface. Summary of the invention

[0005] The purpose of the present invention is to provide a scraping device after lithium battery diaphragm extraction, so as to solve the technical problems in the prior art that the scraping roller state of lithium battery diaphragm cannot be adjusted after extraction and the oil-water mixture agglomerates on the scraping roller, resulting in membrane surface defects.

[0006] The present invention adopts the following technical scheme: a scraping device after extraction of a lithium battery diaphragm, comprising a scraping roller, wherein the scraping roller is an active roller, the scraping roller is a hollow structure, and both ends of the scraping roller are respectively connected with rotating joints, the rotating joint comprises an inner tube and an outer tube which are arranged together in concentric sleeves, the outer tube is sealingly and rotatably assembled on the outside of the inner tube, the inner tube is fixedly connected to the scraping roller and the inner cavity of the inner tube is connected to the inner cavity of the scraping roller, and the outer tube is provided with a heat medium inlet and outlet connected to the inner cavity of the inner tube; one rotating joint of the scraping roller is an active rotating joint, and the other rotating joint is a passive rotating joint, and a driving mechanism is connected to the inner tube of the active rotating joint.

[0007] There are two scraping rollers, which are arranged in parallel and spaced apart from each other.

[0008] The heat medium inlet and outlet of the active rotary joint of one scraper roller are connected to a medium inlet pipe, the heat medium inlet and outlet of the active rotary joint of another scraper roller are connected to a medium outlet pipe, and a medium connecting pipe is connected between the heat medium inlets and outlets of the passive rotary joints of the two scraper rollers.

[0009] The scraping roller is connected to the mold temperature controller, the medium outlet of the mold temperature controller is connected to the medium inlet pipe, and the medium inlet of the mold temperature controller is connected to the medium outlet pipe.

[0010] The medium inlet pipe, medium outlet pipe and medium connecting pipe are all steel wire hoses.

[0011] The active rotary joints are arranged up and down, and are all located on the left side or the right side of the two scraping rollers. Correspondingly, the passive rotary joints are all located on the right side or the left side of the two scraping rollers.

[0012] In the active rotary joint, one end of the inner tube connected to the scraper roller is an open end and the other end is a closed end. Both ends of the inner tube pass through the outer tube. Two bearings arranged at intervals are connected between the outer tube and the inner tube. Skeleton oil seals are respectively provided on the inner sides of the two bearings close to each other. Graphite gaskets are provided between the skeleton oil seals and the bearings. A through hole is opened on the inner tube at a position between the two skeleton oil seals, and the through hole is connected to the inner cavity of the inner tube.

[0013] In the passive rotary joint, both ends of the inner tube are open ends, one end of the inner tube connected to the scraping roller passes through the outer tube, and the other end is located in the outer tube and is connected to the inlet and outlet of the heat medium. A sealing plug is provided at the end of the outer tube away from the scraping roller, and a bearing, a graphite gasket and a skeleton oil seal are installed between the inner tube and the outer tube.

[0014] The driving mechanism is a permanent magnet brushless variable frequency motor.

[0015] A screw device is connected to the mounting seat of the scraping roller, and the screw device is used to drive the scraping roller to move horizontally so that the scraping roller is close to or away from the membrane surface.

[0016] The beneficial effects of the present invention are as follows: the present invention sets the scraping roller as an active roller, can monitor the speed of the scraping roller in real time, reduce the wear of the bearing and avoid the scraping roller from getting stuck, eliminate the phenomenon of the scraping roller not rotating as much as possible, thereby reducing the generation of foreign matter, and can also manually adjust the speed of the scraping roller, reduce the frequency of personnel entering the drying furnace, and improve the scraping effect; rotary joints are respectively connected to the two ends of the scraping roller, and constant temperature heat medium is introduced into the scraping roller through the rotary joints, so that the scraping roller maintains a constant temperature, avoiding film surface defects caused by the condensation of the oil-water mixture on the scraping roller.

[0017] In a preferred solution, two scraping rollers are used to clean the membrane surfaces on both sides of the diaphragm respectively, so as to achieve a better membrane surface cleaning effect.

[0018] In a preferred solution, two scraping rollers are connected in series via a medium connecting pipe, and the heat medium flows smoothly from one scraping roller to the other scraping roller via the medium connecting pipe.

[0019] In a preferred solution, the heat medium is heated by a mold temperature controller and provides circulating power for the entire system, so that the two scraping rollers always maintain a constant temperature, further preventing the oil-water mixture from condensing on the scraping rollers.

[0020] In a preferred solution, in the active rotary joint, the heat medium inlet and outlet are connected to the scraping roller through the holes on the inner tube, and when the inner tube rotates, the heat medium flows through the holes on the inner tube.

[0021] In a preferred solution, in the passive rotary joint, the opening end of the inner tube located on the outer tube is connected to the inlet and outlet of the heat medium, and when the inner tube rotates, the heat medium flows through the opening end of the inner tube.

[0022] In a preferred solution, the drive mechanism of the scraping roller adopts a permanent magnet brushless variable frequency motor, which is convenient for automatic control and real-time monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a scraping device after extraction of a lithium battery diaphragm; Figure 2 yes Figure 1 Installation position diagram of the middle scraper roller; Figure 3 yes Figure 1 Schematic diagram of the active rotary joint; Figure 4 yes Figure 3 A cross-sectional view of Figure 5 yes Figure 1 A cross-sectional view of the passive rotary joint; Figure 6 This is the PLC control diagram of the drive mechanism of the wiper roller.

[0024] In the figure: 1-scraping roller, 2-rotating joint, 2a-active rotating joint, 2b-passive rotating joint, 2.1-inner tube, 2.2-outer tube, 2.3-heat medium inlet and outlet, 2.4-bearing, 2.5-graphite gasket, 2.6-skeleton oil seal, 2.7-sealing ring, 3.1-medium inlet pipe, 3.2-medium outlet pipe, 3.3-medium connecting pipe, 4-mold temperature controller, 5-driving mechanism. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 5 As shown, a scraping device after extraction of a lithium battery diaphragm according to an embodiment of the present invention comprises a scraping roller 1, wherein the scraping roller 1 is an active roller and is a hollow structure. Both ends of the scraping roller 1 are respectively connected with rotary joints 2, wherein the rotary joint 2 comprises an inner tube 2.1 and an outer tube 2.2 which are arranged together in a concentric sleeve, wherein the outer tube 2.2 is sealingly and rotatably assembled on the outside of the inner tube 2.1, wherein the inner tube 2.1 is fixedly connected to the scraping roller 1 and the inner cavity of the inner tube 2.1 is communicated with the inner cavity of the scraping roller 1, and a heat medium inlet and outlet 2.3 which is communicated with the inner cavity of the inner tube 2.1 is provided on the outer tube 2.2; one rotary joint of the scraping roller 1 is an active rotary joint 2a, and the other rotary joint is a passive rotary joint 2b, wherein the inner tube 2.1 of the active rotary joint 2a is connected with a driving mechanism 5, and the driving mechanism 5 is a permanent magnet brushless variable frequency motor.

[0027] like Figure 2 In this embodiment, there are two scraping rollers 1, which are arranged parallel to each other in an upper and lower manner. ED14 is the first guide roller through which the diaphragm is led out of the extract, ED15 is the first drying roller in the drying box for drying, the upper scraping roller is the scraping roller close to ED15, and the lower scraping roller is the scraping roller close to ED14.

[0028] like Figure 3 to Figure 4 As shown, in the active rotary joint 2a, one end of the inner tube 2.1 connected to the scraping roller 1 is an open end and the other end is a closed end. Both ends of the inner tube 2.1 pass through the outer tube. Two bearings 2.4 arranged at intervals are connected between the outer tube 2.2 and the inner tube 2.1. The inner sides of the two bearings 2.4 close to each other are respectively provided with skeleton oil seals 2.6. A graphite gasket 2.3 is provided between the skeleton oil seals 2.6 and the bearings 2.4. A through hole is provided on the inner tube 2.1 between the two skeleton oil seals 2.6. The through hole is communicated with the inner cavity of the inner tube. The end of the inner tube 2.1 connected to the scraping roller 1 is provided with a sealing ring 2.7.

[0029] like Figure 5As shown, in the passive rotary joint 2b, both ends of the inner tube 2.1 are open ends, one end of the inner tube 2.1 connected to the scraping roller 1 passes through the outer tube 2.2, and the other end is located in the outer tube 2.2 and connected to the heat medium inlet and outlet 2.3, and a sealing plug is provided at the end of the outer tube 2.3 away from the scraping roller, and a bearing 2.4, a graphite gasket 2.5 and a skeleton oil seal 2.6 are installed between the inner tube and the outer tube.

[0030] The mounting seat of the scraper roller 1 is connected to a screw device, which is used to drive the scraper roller to move horizontally so that the scraper roller is close to or away from the membrane surface. Figure 2 As shown, of the two scraping rollers, the heat medium inlet and outlet 2.3 of the active rotary joint 2a of one scraping roller 1 is connected to a medium inlet pipe 3.1, the heat medium inlet and outlet 2.3 of the active rotary joint 2a of the other scraping roller is connected to a medium outlet pipe 3.2, and a medium connecting pipe 3.3 is connected between the heat medium inlet and outlet 2.3 of the passive rotary joints 2b of the two scraping rollers. The medium inlet pipe 3.1, the medium outlet pipe 3.2 and the medium connecting pipe 3.3 are all steel hoses.

[0031] The scraping roller 1 is connected to the mold temperature controller 4, the medium outlet of the mold temperature controller 4 is connected to the medium inlet pipe 3.1, and the medium inlet of the mold temperature controller 4 is connected to the medium outlet pipe 3.2. In this embodiment, the active rotary joints 2a are located on the left side of the two scraping rollers, and the passive rotary joints 2b are located on the right side of the two scraping rollers. In other embodiments, the active rotary joints are located on the right side of the two scraping rollers, and the passive rotary joints are located on the left side of the two scraping rollers; it is also possible that the positions of the active rotary joints and the passive rotary joints in the two scraping rollers are opposite, and they can be flexibly adjusted as needed in actual use.

[0032] When in use, soft water is rushed into the mold temperature controller 4 as a heat medium. The mold temperature controller 4 controls the temperature of the soft water through heat exchange through the heat exchanger. The mold temperature controller 4 provides circulation power for the entire system to heat the medium. The medium enters the active rotary joint 2a of the upper scraper roller through the medium inlet pipe 3.1, and then enters the passive rotary joint 2b after entering the upper scraper roller, and then enters the passive rotary joint 2b of the lower scraper roller through the medium connecting pipe 3.3, and then enters the lower scraper roller and the active rotary joint 2a in turn, and finally enters the mold temperature controller 4 through the medium discharge pipe 3.2, realizing the constant temperature circulation of the heat medium, so that the scraper roller maintains a constant temperature, eliminates the condensation of the oil-water mixture on the scraper roller, and avoids the generation of bright oil spots.

[0033] The scraping roller of the present invention is an active roller. The active end rotary joint 2a is connected to a permanent magnet brushless variable frequency motor, which can directly drive the scraping roller to rotate. The speed of the scraping roller is controlled by manually adjusting the motor frequency (vector control). Through PLC program control, the start and stop of the scraping roller is associated with the ED15 roller. The speed of the scraping roller is controlled by adjusting the frequency of the permanent magnet motor to realize manual control / monitoring of the scraping roller state.

[0034] Compared with the passive scraping roller, the active scraping roller can monitor the speed of the scraping roller in real time, reduce the wear of the bearing and avoid the scraping roller from getting stuck, and eliminate the phenomenon of the scraping roller not rotating as much as possible, thereby reducing the generation of foreign matter. The speed of the scraping roller can also be adjusted manually, reducing the frequency of personnel entering the drying furnace and improving the scraping effect.

[0035] When in use, the wiper roller converts the rotation direction of the adjusting bolt into the horizontal movement of the wiper roller through the screw device of the mounting seat at both ends, and then records the current position of the wiper roller according to the scale line under the wiper roller mounting seat itself, so as to adjust the distance between the wiper roller and the membrane surface. The screw device of the wiper roller and the scale line on the mounting seat are the same as those in the prior art, and will not be described here.

[0036] Actual use shows that when the production line speed is 63m / min, the temperature of the mold temperature controller is 28-30℃, the horizontal position difference between the upper and lower scraping rollers is 60-80mm, and the permanent magnet motor frequency is 80-120, the product effect is better and the film surface defects are the least.

[0037] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. The scope of the present invention defined by the appended claims includes all equivalent substitutions and changes.

Claims

1. A scraping device after extraction of lithium battery diaphragm, comprising a scraping roller, characterized in that: The scraping roller is an active roller, and the scraping roller is a hollow structure. Both ends of the scraping roller are respectively connected with rotary joints. The rotary joint includes an inner tube and an outer tube which are arranged together in concentric sleeves. The outer tube is sealingly and rotatably assembled on the outside of the inner tube. The inner tube is fixedly connected to the scraping roller, and the inner cavity of the inner tube is communicated with the inner cavity of the scraping roller. The outer tube is provided with a heat medium inlet and outlet communicated with the inner cavity of the inner tube. One rotary joint of the scraping roller is an active rotary joint, and the other rotary joint is a passive rotary joint. A driving mechanism is connected to the inner tube of the active rotary joint.

2. The scraping device after extraction of lithium battery diaphragm according to claim 1, characterized in that: There are two scraping rollers, which are arranged in parallel and spaced apart from each other.

3. The scraping device after extraction of lithium battery diaphragm according to claim 2, characterized in that: The heat medium inlet and outlet of the active rotary joint of one scraper roller are connected to a medium inlet pipe, the heat medium inlet and outlet of the active rotary joint of another scraper roller are connected to a medium outlet pipe, and a medium connecting pipe is connected between the heat medium inlets and outlets of the passive rotary joints of the two scraper rollers.

4. The scraping device after extraction of lithium battery diaphragm according to claim 3, characterized in that: The scraping roller is connected to the mold temperature controller, the medium outlet of the mold temperature controller is connected to the medium inlet pipe, and the medium inlet of the mold temperature controller is connected to the medium outlet pipe.

5. The scraping device after extraction of lithium battery diaphragm according to claim 3, characterized in that: The medium inlet pipe, medium outlet pipe and medium connecting pipe are all steel wire hoses.

6. The scraping device after extraction of lithium battery diaphragm according to claim 2, characterized in that: The active rotary joints are arranged up and down, and are all located on the left side or the right side of the two scraping rollers. Correspondingly, the passive rotary joints are all located on the right side or the left side of the two scraping rollers.

7. The scraping device after extraction of lithium battery diaphragm according to claim 1, characterized in that: In the active rotary joint, one end of the inner tube connected to the scraper roller is an open end and the other end is a closed end. Both ends of the inner tube pass through the outer tube. Two bearings arranged at intervals are connected between the outer tube and the inner tube. Skeleton oil seals are respectively provided on the inner sides of the two bearings close to each other. Graphite gaskets are provided between the skeleton oil seals and the bearings. A through hole is opened on the inner tube at a position between the two skeleton oil seals, and the through hole is connected to the inner cavity of the inner tube.

8. The scraping device after extraction of lithium battery diaphragm according to claim 1, characterized in that: In the passive rotary joint, both ends of the inner tube are open ends, one end of the inner tube connected to the scraping roller passes through the outer tube, and the other end is located in the outer tube and is connected to the inlet and outlet of the heat medium. A sealing plug is provided at the end of the outer tube away from the scraping roller, and a bearing, a graphite gasket and a skeleton oil seal are installed between the inner tube and the outer tube.

9. The scraping device after extraction of lithium battery diaphragm according to claim 1, characterized in that: The driving mechanism is a permanent magnet brushless variable frequency motor.

10. The scraping device after extraction of lithium battery diaphragm according to claim 1, characterized in that: A screw device is connected to the mounting seat of the scraping roller, and the screw device is used to drive the scraping roller to move horizontally so that the scraping roller is close to or away from the membrane surface.

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