A longitudinal pulling anti-slip oil suction device

Abstract

The utility model belongs to lithium battery wet -process diaphragm production technical field, specifically discloses a kind of longitudinal tensile anti-slip oil suction device, including hot roller, oil scraper, adsorption air knife, driving mechanism, press roller;The oil scraper is located the hot roller directly above;The adsorption air knife is located the left side of oil scraper, and the adsorption air knife and the oil scraper are mutually parallel arrangement;The driving mechanism is used to drive the oil scraper moves.The utility model provides a kind of longitudinal tensile anti-slip oil suction device, solve the existing technology in the longitudinal tensile procedure of lithium battery wet -process diaphragm production, and the oil division on diaphragm is attached on roll surface, which leads to the adhesion between roll surface and diaphragm reduces, and further causes skidding phenomenon, finally causes diaphragm stretch not fully, thickness is uneven, hole structure defect or run-off broken membrane and other problems.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery wet process separator production technology, and in particular to a longitudinal stretch anti-slip oil suction device. Background Technology

[0002] In the wet-process production of lithium-ion battery separators, the longitudinal stretching process is a crucial step. It not only lays the foundation for subsequent high-rate transverse stretching but also plays a key role in ensuring the stability of the transverse stretching process. Specifically, the longitudinal stretching process, by initially stretching the film along the machine direction, forms the initial microporous structure and significantly enhances the longitudinal strength and toughness of the separator. This enhanced strength and toughness are essential for resisting the enormous tension during subsequent transverse stretching and preventing separator rupture. It is a fundamental and critical step in ensuring that the final separator forms a uniform microporous structure and achieves the required mechanical properties. Simultaneously, the synergistic effect of the longitudinal and transverse stretching processes jointly determines the final performance of the separator.

[0003] However, a significant technical problem exists in the longitudinal stretching process: due to the high oil content in the raw materials, a large amount of oil is released during the preheating and stretching of the diaphragm, resulting in a significant amount of oil residue on the roller surface of the longitudinal stretching equipment. This residual oil can cause a series of problems when the diaphragm is stretched at high ratios, including insufficient stretching due to slippage, leading to uneven diaphragm thickness and pore structure defects; or diaphragm breakage due to misalignment, ultimately affecting the stable production of the diaphragm. Currently, existing technologies lack an efficient synchronous oil removal mechanism, therefore, a device capable of removing residual oil from the roller surface in real time is urgently needed.

[0004] To address the aforementioned issues, past practices and some patented longitudinal stretching anti-slip devices typically include a preheating roller, a rubber pressure roller, and an oil scraper. The working process is as follows: During production, heat-conducting oil is introduced into the hollow metal cylinder inside the preheating roller and circulated. Heat is then evenly transferred to the roller surface via thermal conduction to precisely control the roller surface temperature, thereby softening the diaphragm passing over it. Simultaneously, the pressure roller squeezes the diaphragm, removing approximately 40% of the surface oil-water mixture, thus completing the longitudinal stretching process.

[0005] However, the above technical solution still has obvious defects: although it can maintain the stable operation of the system to a certain extent, the oil stains on the roller surface cannot be completely removed during actual operation, and an oil film will form on the roller surface. This oil film will isolate the roller surface and the diaphragm, resulting in a decrease in the adhesion between the two, which in turn causes slippage. Ultimately, this leads to problems such as insufficient diaphragm stretching, uneven thickness, pore structure defects, or misalignment and diaphragm breakage, which seriously affects the stable production of the diaphragm.

[0006] In summary, in the longitudinal stretching process of lithium battery wet separator production in the existing technology, oil on the separator adheres to the roller surface, which reduces the adhesion between the roller surface and the separator, leading to slippage. Ultimately, this results in problems such as insufficient separator stretching, uneven thickness, pore structure defects, or membrane breakage due to misalignment. Utility Model Content

[0007] This invention provides a longitudinal stretching anti-slip oil suction device, which can solve the problems in the longitudinal stretching process of lithium battery wet process separator production where oil on the separator adheres to the roller surface, reducing the adhesion between the roller surface and the separator, thus causing slippage, and ultimately resulting in insufficient separator stretching, uneven thickness, pore structure defects, or membrane breakage due to deviation.

[0008] A longitudinal anti-slip oil suction device, comprising:

[0009] Hot roller;

[0010] An oil scraper is located directly above the hot roller;

[0011] An adsorption air knife is located on the left side of the oil scraper, and the adsorption air knife and the oil scraper are arranged parallel to each other;

[0012] A drive mechanism is used to drive the oil scraper to move;

[0013] A pressure roller is disposed below a hot roller, and a gap exists between the pressure roller and the hot roller.

[0014] The adsorption air knife is also equipped with a vacuum recovery component, which includes a vacuum pump and an oil-gas separator. The outlet end of the vacuum pump is connected to the oil-gas separator through a pipe, and the inlet end of the vacuum pump is connected to the adsorption air knife through a pipe.

[0015] Furthermore, an oil storage tank is provided at the outlet end of the oil-gas separator.

[0016] Furthermore, the top of the oil-gas separator is equipped with an exhaust gas treatment device.

[0017] Furthermore, the bottom of the oil-gas separator is equipped with a vent valve.

[0018] Furthermore, valves are provided on the pipe between the outlet end of the vacuum pump and the oil-gas separator, and on the pipe between the inlet end of the vacuum pump and the adsorption air knife.

[0019] Furthermore, the oil scraper is equipped with a first angle adjuster, which is used to adjust the blade angle of the oil scraper.

[0020] Furthermore, the adsorption air knife is equipped with a second angle adjuster, which is used to adjust the blade angle of the adsorption air knife.

[0021] Furthermore, the distance between the adsorption air knife and the hot roller is 4.5-5.5 mm.

[0022] Furthermore, the drive mechanism is also provided with a pressure feedback component, which includes a pressure sensor and a control unit. The pressure sensor is disposed between the oil scraper and the drive mechanism.

[0023] The control unit is used to adjust the output of the drive mechanism based on feedback from the pressure sensor.

[0024] Furthermore, the driving mechanism is a servo cylinder.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] This invention provides a longitudinal stretching anti-slip oil suction device, which includes a hot roller, an oil scraper, an adsorption air knife, a drive mechanism, and a pressure roller. The hot roller can be filled with heat-conducting oil to heat the lithium battery separator. The pressure roller can be positioned to the side of the hot roller and in direct contact with the separator according to the separator's orientation. The oil scraper can be positioned directly above the hot roller according to the separator's orientation. The adsorption air knife is positioned above the hot roller and used in combination with the oil scraper to achieve simultaneous oil scraping and adsorption. This solves the problem in the longitudinal stretching process of lithium battery wet separator production where oil on the separator adheres to the roller surface, reducing the adhesion between the roller surface and the separator, leading to slippage, and ultimately causing insufficient separator stretching, uneven thickness, pore structure defects, or membrane breakage due to misalignment. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This utility model provides a structural schematic diagram of a longitudinal tension anti-slip oil suction device;

[0029] Figure 2 A schematic diagram of the vacuum recovery component of a longitudinal anti-slip oil suction device provided by this utility model.

[0030] Explanation of reference numerals in the attached drawings: 1. Hot roller; 2. Pressure roller; 3. Oil scraper; 4. Adsorption air knife; 5. Drive mechanism; 6. First angle adjuster; 9. Vacuum pump; 10. Oil-gas separator. Detailed Implementation

[0031] The specific embodiments of this utility model are described in detail below, but it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0032] like Figures 1 to 2 As shown, the present invention provides a longitudinal anti-slip oil suction device, which includes a hot roller 1, an oil scraper 3, an adsorption air knife 4, a drive mechanism 5, and a pressure roller 2.

[0033] Hot roller 1, which is a preheating roller, has a hollow cavity inside. By introducing heat transfer oil into the hollow cavity and circulating it, heat is evenly transferred to the roller surface of hot roller 1 through heat conduction, thereby accurately controlling the roller surface temperature and softening the lithium battery separator passing over its surface.

[0034] The oil scraper 3 is located directly above the hot roller 1, and there is a certain gap between the oil scraper 3 and the hot roller 1. The size of this gap can be adjusted by the drive mechanism 5.

[0035] Adsorption air knife 4 is located on the left side of oil scraper 3. The adsorption air knife 4 and oil scraper 3 are arranged parallel to each other, and there is a certain gap between the adsorption air knife 4 and the hot roller 1. The adsorption air knife 4 is used to adsorb oil.

[0036] Drive mechanism 5 is used to drive the oil scraper 3 to move, thereby changing the distance between the oil scraper 3 and the hot roller 1. The drive mechanism 5 can be a servo cylinder.

[0037] Pressure roller 2 is located below hot roller 1. There is a gap between pressure roller 2 and hot roller 1. Pressure roller 2 and hot roller 1 are used together to guide the lithium battery separator.

[0038] The adsorption air knife 4 is also equipped with a vacuum recovery component, which includes a vacuum pump 9 and an oil-gas separator 10. The outlet end of the vacuum pump 9 is connected to the oil-gas separator 10 through a pipe, and the inlet end of the vacuum pump 9 is connected to the adsorption air knife 4 through a pipe. In actual use, the system start-up and shutdown steps of the vacuum recovery component are as follows: a negative pressure can be established by starting the vacuum pump 9, and then the oil scraper 3 can be turned on; the operation is reversed when stopping; oil recovery: the adsorbed oil vapor enters the oil-gas separator 10 through the pipe, and the liquid oil is collected in the external oil storage tank.

[0039] The installation process for this longitudinal anti-slip oil suction device is as follows:

[0040] In actual use, an oil scraper 3, an adsorption air knife 4, a drive mechanism 5, and a pressure roller 2 can be installed in the area of ​​the heated roller 1. Specifically, the oil scraper 3 is installed directly above the heated roller 1, and the initial applied pressure can be adjusted through the drive mechanism 5; the adsorption air knife 4 can be located to the side of the oil scraper 3, specifically, the adsorption air knife 4 can be arranged parallel to the oil scraper 3; the pressure roller 2 is located on the side of the heated roller 1 away from the oil scraper 3.

[0041] The operating principle of this longitudinal anti-slip oil suction device is as follows:

[0042] Step 1: Install the oil scraper 3, the suction air knife 4, the drive mechanism 5, and the pressure roller 2 into appropriate positions;

[0043] Step 2: The diaphragm substrate enters the preheating roller area and is heated and softened by the heated roller surface. The softened diaphragm, carrying a low-viscosity oil-water mixture, enters the extrusion zone formed by the hot roller 1 and the pressure roller 2. The pressure applied by the pressure roller 2 squeezes out the oil-water mixture on the diaphragm surface. The diaphragm continues to move forward with the hot roller 1. The oil residue on the roller surface is scraped clean by the oil scraper 3 that is close to the roller surface. The adsorption air knife 4 sucks the oil residue into the oil-gas separator 10 through the vacuum pump 9 for oil recovery and reuse.

[0044] After being treated by the longitudinal stretching anti-slip oil suction device, the diaphragm has a significantly reduced oil-water mixture on its surface and an increased surface viscosity (due to the reduction of oil and softening of the membrane). When it enters the subsequent longitudinal stretching roller group, the friction with the roller surface is greatly enhanced, effectively preventing slippage and creating conditions for stable and uniform longitudinal stretching.

[0045] like Figures 1 to 2 As shown, in some embodiments of this utility model, an oil storage tank is provided at the outlet end of the oil-gas separator 10; the oil storage tank at the outlet end of the oil-gas separator 10 is used to receive liquid oil from the oil-gas separator 10 to realize resource recovery, and the setting of the oil storage tank realizes centralized storage and protects the cleanliness of the production area.

[0046] like Figures 1 to 2 As shown, in some embodiments of this utility model, an exhaust gas treatment device is provided on the top of the oil-gas separator 10; the exhaust gas treatment device is provided on the top of the oil-gas separator 10 to further purify the oil mist and other substances remaining after the initial separation by the oil-gas separator 10, so as to ensure that the final emitted gas meets the emission standards. In addition, the exhaust gas treatment device can also improve the production environment and ensure the health of operators.

[0047] like Figures 1 to 2 As shown, in some embodiments of this utility model, an exhaust valve is provided at the bottom of the oil-gas separator 10; the exhaust valve at the bottom of the oil-gas separator 10 can regularly drain sewage, maintain efficiency, prevent the oil-gas separator 10 from clogging, and also facilitate the maintenance and cleaning of the oil-gas separator 10.

[0048] like Figures 1 to 2 As shown, in some embodiments of this utility model, valves are provided on the pipe between the outlet end of the vacuum pump 9 and the oil-gas separator 10, and on the pipe between the inlet end of the vacuum pump 9 and the adsorption air knife 4.

[0049] A valve is installed on the pipeline between the outlet end of the vacuum pump 9 and the oil-gas separator 10. When the vacuum pump 9 stops, the valve can be closed to prevent the oil in the oil-gas separator 10 from flowing back, thus avoiding contamination of the pump body and extending the service life of the vacuum pump 9.

[0050] A valve is installed on the pipeline between the inlet end of the vacuum pump 9 and the adsorption air knife 4. By adjusting the valve opening, the flow rate of the oil / oil vapor entering the vacuum pump can be controlled; and the start and stop of the oil / oil vapor transmission in the pipeline can be realized.

[0051] like Figures 1 to 2 As shown, in some embodiments of this utility model, the oil scraper 3 is provided with a first angle adjuster 6, which is used to adjust the blade angle of the oil scraper 3.

[0052] Specifically, the first angle adjuster 6 is a conventional type of angle adjuster, which is designed to adjust the working angle of the oil scraper 3 (the angle between the blade of the oil scraper 3 and the tangent of the hot roller 1).

[0053] like Figures 1 to 2 As shown, in some embodiments of this utility model, the first angle adjuster 6 can adopt the following structure:

[0054] First, the first angle adjuster 6 includes an external bracket, a worm gear mechanism located inside the external bracket, and an adjusting handwheel. The worm gear mechanism includes a worm wheel, a worm, and a connecting shaft. The worm meshes perpendicularly with the worm wheel, and the worm wheel is sleeved outside the connecting shaft. Both ends of the connecting shaft are located on the external bracket, while one end of the worm is located on the external bracket, and the other end of the worm is connected to the adjusting handwheel. In addition, the axis of the worm wheel is parallel to the axis of the hot roller 1.

[0055] Secondly, a rotating shaft is provided at both ends of the base of the oil scraper 3. The axis of the rotating shaft is parallel to the axis of the hot roller 1, and the two rotating shafts are respectively connected to the connecting shaft.

[0056] Finally, bearings can be installed on the external bracket to support the shaft and worm gear.

[0057] The working principle of the first angle adjuster 6 is as follows:

[0058] The operator rotates the adjustment handwheel, which drives the worm gear to rotate. The worm gear drives the meshing worm wheel to rotate, which drives the connecting shaft to rotate. The connecting shaft drives the rotating shaft to rotate, which drives the base of the oil scraper 3 to rotate, thus achieving precise adjustment of the working angle of the oil scraper 3 (the angle between the blade of the oil scraper 3 and the tangent of the hot roller 1).

[0059] like Figures 1 to 2 As shown, in some embodiments of this utility model, the adsorption air knife 4 is provided with a second angle adjuster, which is used to adjust the blade angle of the adsorption air knife 4.

[0060] The second angle adjuster is a conventional type, designed to adjust the angle of the oil scraper 3. More specifically, similarly, both ends of the base of the adsorption air knife 4 are equipped with rotating shafts, and the second angle adjuster can adopt the same structure as the first angle adjuster 6. The rotating shaft is driven to rotate through the connecting shaft on the second angle adjuster to adjust the blade angle (working angle, i.e., the angle between the blade surface of the adsorption air knife 4 and the tangent of the hot roller 1) of the adsorption air knife 4. This will not be elaborated here.

[0061] like Figures 1 to 2 As shown, in some embodiments of this utility model, the distance between the adsorption air knife 4 and the hot roller 1 is 4.5-5.5 mm; the distance between the adsorption air knife 4 and the hot roller 1 is preferably 5.0 mm.

[0062] In addition, after the adsorption air knife 4 is installed, it extends along its blade surface to the surface of the hot roller 1 to form a contact line. The contact line consists of multiple contact points. The tangent of this contact point (which can be used as a tangent point) on the roller of the hot roller 1 can be the tangent of the roller of the hot roller 1, that is, it can be used as the tangent of the roller where the adsorption air knife 4 contacts the hot roller 1.

[0063] like Figures 1 to 2 As shown, in some embodiments of this utility model, the drive mechanism 5 is also provided with a pressure feedback component, which includes a pressure sensor and a control unit. The pressure sensor is disposed between the oil scraper 3 and the drive mechanism 5.

[0064] The control unit is used to adjust the output of the drive mechanism 5 based on the feedback from the pressure sensor;

[0065] With this setup, the insertion depth of the scraper blade 3 can be adjusted, ensuring effective oil scraping while avoiding damage to the hot roller 1. Furthermore, when the scraper blade 3 contacts the hot roller 1, a contact line is formed between its tip and the roller of the hot roller 1. The contact line consists of multiple contact points, and the tangent of this contact point (which can be used as a tangent point) on the roller of the hot roller 1 can be the tangent of the roller of the hot roller 1, that is, it can be used as the tangent of the roller where the scraper blade 3 contacts the hot roller 1.

[0066] like Figures 1 to 2As shown, in some embodiments of this utility model, the driving mechanism 5 is a servo cylinder; the servo cylinder is a conventional cylinder, and its output end is connected to the oil scraper 3, which is used to bring the oil scraper 3 into contact with the surface of the hot roller 1, thereby scraping off the oil stains on the surface of the hot roller 1; by using a servo cylinder for driving, the adjustment of the distance between the oil scraper 3 and the hot roller 1 is more stable and reliable.

[0067] This invention provides a longitudinal stretching anti-slip oil suction device, which includes a hot roller, an oil scraper, an adsorption air knife, a drive mechanism, and a pressure roller. The hot roller can be filled with heat-conducting oil to heat the lithium battery separator. The pressure roller can be positioned to the side of the hot roller and in direct contact with the separator according to the separator's orientation. The oil scraper can be positioned directly above the hot roller according to the separator's orientation. The adsorption air knife is positioned above the hot roller and used in combination with the oil scraper to achieve simultaneous oil scraping and adsorption. This solves the problem in the longitudinal stretching process of lithium battery wet separator production where oil on the separator adheres to the roller surface, reducing the adhesion between the roller surface and the separator, leading to slippage, and ultimately causing insufficient separator stretching, uneven thickness, pore structure defects, or membrane breakage due to misalignment.

[0068] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

[0069] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0070] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A longitudinal anti-slip oil suction device, characterized in that, include: Hot roller (1); Oil scraper (3), the oil scraper (3) is located directly above the hot roller (1); Adsorption air knife (4), the adsorption air knife (4) is located on the left side of the oil scraper (3), and the adsorption air knife (4) and the oil scraper (3) are arranged parallel to each other; A drive mechanism (5) is used to drive the oil scraper (3) to move; A pressure roller (2) is disposed below a hot roller (1), and there is a gap between the pressure roller (2) and the hot roller (1); The adsorption air knife (4) is also equipped with a vacuum recovery component, which includes a vacuum pump (9) and an oil-gas separator (10). The outlet end of the vacuum pump (9) is connected to the oil-gas separator (10) through a pipe, and the inlet end of the vacuum pump (9) is connected to the adsorption air knife (4) through a pipe.

2. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The oil-gas separator (10) is equipped with an oil storage tank at its outlet end.

3. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The top of the oil-gas separator (10) is equipped with an exhaust gas treatment device.

4. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The bottom of the oil-gas separator (10) is equipped with a vent valve.

5. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, Valves are provided on the pipe between the outlet end of the vacuum pump (9) and the oil-gas separator (10), and on the pipe between the inlet end of the vacuum pump (9) and the adsorption air knife (4).

6. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The oil scraper (3) is provided with a first angle adjuster (6), which is used to adjust the blade angle of the oil scraper (3).

7. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The adsorption air knife (4) is equipped with a second angle adjuster, which is used to adjust the blade angle of the adsorption air knife (4).

8. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The distance between the adsorption air knife (4) and the hot roller (1) is 4.5-5.5 mm.

9. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The drive mechanism (5) is also provided with a pressure feedback component, which includes a pressure sensor and a control unit. The pressure sensor is located between the oil scraper (3) and the drive mechanism (5). The control unit is used to adjust the output of the drive mechanism (5) based on the feedback from the pressure sensor.

10. The longitudinal anti-slip oil suction device according to claim 1, characterized in that, The drive mechanism (5) is a servo cylinder.

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