Non-contact diaphragm removing device

Abstract

The invention discloses a non-contact diaphragm removal device, which comprises a tank body, a volatilization box, labyrinth seal valves, a drying box body, a Roots blower, a gas-liquid separation cooler, a heat exchanger, an induced draft fan, a pressure transmitter and a diaphragm separation device, the labyrinth seal valves comprise a first labyrinth seal valve and a second labyrinth seal valve, the drying box body comprises a first-stage drying box body and a second-stage drying box body. The device is simple, reasonable and reliable in structure, capable of effectively achieving damage-free treatment on the surface of the polyolefin film, low in equipment transformation cost, capable of reducing energy consumption, capable of achieving standard emission of gas, environmentally friendly and free of pollution.

Description

Technical Field

[0001] This invention relates to a non-contact diaphragm removal device. Background Technology

[0002] Polyolefin membranes are key materials used in lithium-ion batteries. In the wet membrane manufacturing process, the surface quality of polyolefin membranes is a common problem. The surface quality of polyolefin membranes affects the air permeability and appearance of the product. Currently, most manufacturers use a contact method to treat the membrane surface. However, this contact method can cause irreversible scratches and uneven shrinkage, resulting in both external and internal defects. This is mainly due to the volatilization of dichloromethane through contact with heated rollers. During this process, the volatilization rate of dichloromethane on the polyolefin membrane surface becomes inconsistent, causing defects such as dark marks and stains on the polyolefin membrane surface.

[0003] Even if some manufacturers adopt non-contact treatment solutions, they still use an external air source to treat the surface of the polyolefin membrane. The cleanliness and temperature and humidity control requirements of the external air source are extremely stringent. At the same time, using an external air source will create an over-positive pressure condition inside the equipment, which is a great test of the system's sealing performance, is not friendly to the surrounding environment, and will also significantly increase unnecessary energy consumption, resulting in poor overall performance. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a non-contact membrane removal device with a simple, reasonable and reliable structure, which can effectively achieve non-destructive treatment of polyolefin membrane surfaces, with low equipment modification costs, reduced energy consumption, and gas emission compliance, making it environmentally friendly and pollution-free.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A non-contact diaphragm removal device is provided, including a tank, a volatilization chamber, a labyrinth seal valve, a drying chamber, a Roots blower, a gas-liquid separator cooler, a heat exchanger, an induced draft fan, a pressure transmitter, and a membrane separation device. The tank contains dichloromethane, and a first guide roller with an inverted triangular distribution is arranged within the tank, with the bottom first guide roller located within the dichloromethane. The volatilization chamber is connected above the tank and contains a second guide roller. The labyrinth seal valve includes a first labyrinth seal valve and a second labyrinth seal valve. The drying chamber includes a primary drying chamber and a secondary drying chamber. The side discharge end of the volatilization chamber is connected to the upper side of the primary drying chamber via a first labyrinth seal valve flush with the second guide roller. The primary drying chamber contains multiple third guide rollers arranged in a staggered manner, and an airflow diffuser is arranged above the third guide rollers in the primary drying chamber. The lower side of the primary drying chamber is connected to the lower side of the secondary drying chamber via a second labyrinth sealing valve. The secondary drying chamber contains multiple staggered fourth guide rollers. A fifth guide roller is flush with the outer surface of the upper side output end of the secondary drying chamber. The top of the evaporation chamber is connected to the inlet of a Roots blower via a pipe and a first flexible connection. The outlet of the Roots blower is connected to the input of a gas-liquid separator / cooler via a pipe after passing through a first square joint and a second flexible connection. One output of the gas-liquid separator / cooler is connected to a heat exchanger and then to an airflow diffuser via a pipe with a first valve. Another output is connected to the third flexible connection at the inlet of the induced draft fan via a pipe with a second valve and a hydraulic valve. The secondary drying chamber is also connected to the induced draft fan via a pressure transmitter. The outlet of the induced draft fan is connected to a membrane separation device via a pipe after passing through a second square joint and a fourth flexible connection.

[0006] In a preferred embodiment of the present invention, the evaporation box is provided with two sets of support rollers and a rotating impeller arranged crosswise below the second guide roller.

[0007] In a preferred embodiment of the present invention, the rotating impeller is fixed to the evaporation chamber by a laterally distributed telescopic component.

[0008] In a preferred embodiment of the present invention, the airflow evacuation device includes an airflow pressure stabilizing box, a uniformly distributed air inlet pipe, and an air outlet.

[0009] In a preferred embodiment of the present invention, multiple evenly distributed air inlet pipes are provided on the top of the airflow stabilizing box, and an air outlet is provided at the bottom of the airflow stabilizing box.

[0010] The beneficial effects of this invention are: the non-contact membrane removal device disclosed in this invention has a simple, reasonable and reliable structure, can effectively achieve non-destructive treatment of polyolefin membrane surfaces, has low equipment modification costs, reduces energy consumption, and achieves gas emission standards, making it environmentally friendly and pollution-free. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of a non-contact diaphragm removal device according to the present invention; Figure 2 This is a perspective view of an airflow evacuator according to a preferred embodiment of a non-contact diaphragm removal device of the present invention. Detailed Implementation

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please see Figures 1-2 As shown, embodiments of the present invention include: A non-contact diaphragm removal device includes a tank 1, an evaporation chamber 2, a labyrinth seal valve, a drying chamber 3, a Roots blower 3, a gas-liquid separator cooler 4, a heat exchanger 5, an induced draft fan 6, a pressure transmitter 7, and a membrane separation device 8.

[0014] The tank 1 contains dichloromethane, and the tank 1 is provided with inverted triangular first guide rollers 9, with the bottom first guide roller 9 located inside the dichloromethane. The cleaned polyolefin film 10 passes through the dichloromethane via the first guide roller 9.

[0015] The evaporation box 2 is connected and disposed above the tank 1. A second guide roller 11 is disposed inside the evaporation box 2. Two sets of support rollers 12 and a rotating impeller 13 are cross-arranged below the second guide roller 11. The air volume of the rotating impeller 13 is adjusted by frequency conversion control of the rotation speed. The polyolefin membrane 10 passes between the support roller 12 and the rotating impeller 13. The high-speed rotating impeller 13 drives the airflow to reverse the flow of dichloromethane on the surface of the polyolefin membrane 10 into the tank 1. A small amount of dichloromethane evaporates on the surface of the polyolefin membrane 10. To prevent the polyolefin membrane 10 from shaking under the influence of the high-speed wind, the support roller 12 is set on the other side of the membrane being blown by the wind. Since the dichloromethane evaporates on the surface of the polyolefin membrane 10, the support roller 12 will not freeze and does not need to be circulated for heat exchange, reducing energy consumption by about 10%. Compared with the contact removal method, the surface of the polyolefin membrane 10 after being blown by the wind is free of droplets of dichloromethane. During the subsequent drying process, no surface defects such as stains or dark marks will appear when drying the internal pores of the polyolefin membrane 10.

[0016] The rotating impeller 13 is fixed to the evaporation chamber 2 by a laterally distributed telescopic component 14, which is used to adjust the distance between the rotating impeller 13 and the polyolefin membrane 10.

[0017] The labyrinth sealing valve includes a first labyrinth sealing valve 15 and a second labyrinth sealing valve 16, and the drying chamber includes a primary drying chamber 17 and a secondary drying chamber 18.

[0018] The side discharge end of the evaporation box 2 is connected to the upper side of the primary drying box 17 through the first labyrinth sealing valve 15 flush with the second guide roller 11. The polyolefin film 10 is immersed into the primary drying box 17 through the second guide roller 11 and the first labyrinth sealing valve 15.

[0019] The primary drying chamber 17 is equipped with multiple staggered third guide rollers 19. The lower side of the primary drying chamber 17 is connected to the lower side of the secondary drying chamber 18 through the second labyrinth sealing valve 16. The polyolefin film 10 enters the secondary drying chamber 18 through the third guide rollers 19 and the second labyrinth sealing valve 16.

[0020] The primary drying chamber 17 is provided with an airflow diffuser 20 above the third guide roller 19. The airflow diffuser 20 includes an airflow stabilizing chamber 201, a uniformly distributed air inlet pipe 202, and an air outlet 203. Multiple uniformly distributed air inlet pipes 202 are provided and are equally spaced on the top of the airflow stabilizing chamber 201. An air outlet 203 is provided at the bottom of the airflow stabilizing chamber 201. The airflow diffuser 20 is used to uniformly distribute non-condensable gases into the primary drying chamber 17.

[0021] The secondary drying chamber 18 is equipped with multiple fourth guide rollers 21 that are staggered vertically. A fifth guide roller 22 is flush with the outside of the upper side output end of the secondary drying chamber 18. After drying in the secondary drying chamber 18, the polyolefin film 10 is wound up after passing through the fifth guide roller 22.

[0022] The top of the evaporation chamber 2 is also connected to the air inlet of the Roots blower 3 via a pipe and a first flexible connection 23. The air outlet of the Roots blower 3 is connected to the input of the gas-liquid separator 4 via a pipe after being connected to the second flexible connection 25 via a first square joint 24. During the phase conversion process, the gas expansion system will form a positive pressure environment. The gaseous and droplet-shaped dichloromethane is recovered by the Roots blower 3 through the gas-liquid separator 4.

[0023] The output of the gas-liquid separator 4 is connected to the heat exchanger 5 and then to the airflow diffuser 20 via a pipeline with a first valve 26. A portion of the non-condensable gas separated by the gas-liquid separator 4 is heated by the heat exchanger 5 and returned to the primary drying chamber 17 via the airflow diffuser 20, thus preventing the cooled non-condensable gas from affecting the internal air field. Another portion of the gas is connected to the third flexible connection 30 at the air inlet of the induced draft fan 6 via a pipeline with a second valve 27 and a hydraulic valve 28. The air outlet of the induced draft fan 6 is connected to the membrane separation device 8 via a pipeline after being connected to the second square joint 31 and the fourth flexible connection 32. Another portion of the gas separated by the gas-liquid separator 4 and the low-concentration gas in the secondary drying chamber 18 are recycled by the induced draft fan 6 and discharged in compliance with standards.

[0024] The secondary drying chamber 18 is also connected to the induced draft fan 6 via a pressure transmitter 7. The induced draft fan 6 is idling through the pressure transmitter 7, and the gas is finally discharged in compliance with the standards.

[0025] In summary, the non-contact membrane removal device proposed in this invention has a simple, reasonable, and reliable structure, which can effectively achieve non-destructive treatment of polyolefin membrane surfaces. It has low equipment modification costs, reduces energy consumption, and achieves gas emission standards, making it environmentally friendly and pollution-free.

[0026] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A non-contact diaphragm removal device, characterized in that, The system includes a tank, a evaporation chamber, labyrinth seal valves, a drying chamber, a Roots blower, a gas-liquid separator cooler, a heat exchanger, an induced draft fan, a pressure transmitter, and a membrane separation device. The tank contains dichloromethane, and first guide rollers arranged in an inverted triangular pattern are positioned within the tank, with the bottom first guide roller located within the dichloromethane. The evaporation chamber is connected above the tank and contains second guide rollers. The labyrinth seal valves include a first labyrinth seal valve and a second labyrinth seal valve. The drying chamber includes a primary drying chamber and a secondary drying chamber. The side outlet of the evaporation chamber is connected to the upper side of the primary drying chamber via a first labyrinth seal valve flush with the second guide rollers. The primary drying chamber contains multiple staggered third guide rollers, and an airflow diffuser is located above the third guide rollers. The lower side of the primary drying chamber is connected via a second labyrinth seal valve. The valve is connected to the lower side of the secondary drying chamber. Multiple staggered fourth guide rollers are installed inside the secondary drying chamber. A fifth guide roller is flush with the outer surface of the upper side output end of the secondary drying chamber. The top of the evaporation chamber is also connected to the air inlet of the Roots blower via a pipe and a first flexible connection. The air outlet of the Roots blower is connected to the input end of the gas-liquid separator via a pipe and a first square joint and a second flexible connection. The output end of the gas-liquid separator is connected to the heat exchanger via one path and then to the airflow diffuser via a pipe with a first valve. Another path connects to the third flexible connection at the air inlet of the induced draft fan via a pipe with a second valve and a hydraulic valve. The secondary drying chamber is also connected to the induced draft fan via a pressure transmitter. The air outlet of the induced draft fan is connected to the membrane separation device via a pipe and a second square joint and a fourth flexible connection.

2. The non-contact diaphragm removal device according to claim 1, characterized in that, The evaporation box has two sets of support rollers and a rotating impeller arranged crosswise below the second guide roller.

3. The non-contact diaphragm removal device according to claim 2, characterized in that, The rotating impeller is fixed to the evaporation chamber by laterally distributed telescopic components.

4. The non-contact diaphragm removal device according to claim 1, characterized in that, The airflow evacuation device includes an airflow pressure regulating box, a uniformly distributed air inlet pipe, and an air outlet.

5. The non-contact diaphragm removal device according to claim 4, characterized in that, Multiple evenly distributed air inlet pipes are provided at equal intervals on the top of the airflow stabilizing box, and an air outlet is provided at the bottom of the airflow stabilizing box.

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