Oil removal mechanism for longitudinal drawing machine of lithium battery diaphragm production line

Abstract

The utility model provides a lithium battery diaphragm production line longitudinal drawing machine oil removal mechanism which comprises a vertical frame, a vertical plate and a gas circuit distributor, the vertical plate is fixedly installed on the top of the vertical frame, the gas circuit distributor is arranged on one side of the vertical frame, collecting mechanisms are fixedly installed on the inner walls of the vertical frame and the vertical plate, and a plurality of drawing rollers are arranged on the vertical plate. By optimizing and modifying the structure of the side plate of the stretching roller, the friction force between a membrane and the roller can be greatly improved, the membrane does not slip after the stretching ratio is improved, and the membrane is prevented from being scratched and uneven in thickness; a set of auxiliary rubber roller is additionally arranged on the side plate, is pressed on one side of the stretching roller and is used for adsorbing white oil on the surface of the stretching roller, and the main body structure of the longitudinal stretching machine does not need to be changed on a large scale, so that the slipping phenomenon between a membrane and the roller can be effectively reduced, the oil removal rate is obviously improved, and the influence of the white oil on the quality of the membrane is reduced; the production stability and the product percent of pass of the lithium battery diaphragm are improved, and upgrading and reconstruction of an existing production line are facilitated.

Description

Technical Field

[0001] This utility model relates to an oil removal mechanism for a longitudinal stretching machine in a lithium battery separator production line, belonging to the technical field of lithium battery separator production equipment. Background Technology

[0002] The lithium-ion battery separator is the core inner layer material of a lithium-ion battery, located between the positive and negative electrodes, and has a porous thin-film structure. It both prevents short circuits between the electrodes and allows lithium ions to pass freely, ensuring normal charging and discharging of the battery. The material is mainly polyolefin and must possess properties such as heat resistance, insulation, and uniform air permeability, directly affecting the battery's safety, capacity, and cycle life.

[0003] Lithium-ion battery separators are a core component of lithium-ion batteries, and longitudinal stretching machines improve separator performance through longitudinal stretching. However, with increasing stretching ratios, existing longitudinal stretching machines suffer from two major technical defects: First, the original pressure roller diameter is only 120mm, resulting in a small contact area with the membrane and insufficient friction between the membrane and roller, making slippage easy and leading to membrane scratches and uneven thickness. Second, white oil precipitated from the membrane easily remains on the surface of the stretching rollers, which existing devices cannot effectively adsorb, causing the white oil to transfer to the membrane surface and form oil spots, affecting separator quality and subsequent processing. Existing improvement solutions either only address membrane degreasing without solving the slippage problem, or have complex structures and high modification costs, making them unsuitable for rapid upgrades of existing production lines. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a simple and easily adaptable modification structure for the oil removal device of a longitudinal stretching machine. By optimizing the pressure rollers and adding an auxiliary oil removal structure, it simultaneously solves the problems of membrane slippage and white oil contamination, reduces modification costs, and improves the qualification rate of diaphragm production lines for lithium battery diaphragm production.

[0005] This utility model solves the above-mentioned technical problems through the following technical solutions:

[0006] This utility model provides an oil removal mechanism for a longitudinal stretching machine in a lithium battery separator production line, including a frame, a plate, and an air distributor. The plate is fixedly installed on the top of the frame, and the air distributor is located on one side of the frame. A collection mechanism is fixedly installed on the inner wall of both the frame and the plate. Multiple stretching rollers are provided on the plate, and both ends of the stretching rollers are rotatably connected to the inside of the stretching roller side plate. A stretching roller lifting cylinder is fixedly installed on the plate, and the telescopic end of the stretching roller lifting cylinder is fixedly connected to the stretching roller side plate. Multiple inclined first pressure roller cylinders are fixedly installed on the plate, and the telescopic ends of the first pressure roller cylinders are fixedly connected to bearing seats. The bearing seats are rotatably connected to the first pressure rollers. Multiple evenly distributed second pressure roller cylinders and second pressure rollers are provided on the side walls of the frame and the plate.

[0007] In this technical solution, the gas distributor is fixed to the ground by a mounting bracket, and there are two uprights and two upright plates. Both upright plates are fixed to the ground by the uprights.

[0008] In this technical solution, the collection mechanism includes a collection pipe and a hollow scraper. The collection pipe is fixedly installed to the inner wall of the upright and the upright plate by a fixing component. The hollow scraper is fixedly connected to the collection pipe, and the end of the collection pipe located on the upright plate is fixedly connected to the negative pressure pipe.

[0009] In this technical solution, both ends of the first pressure roller are located inside the bearing housing, and the diameter of the first pressure roller is 150mm.

[0010] In this technical solution, there are multiple first pressure rollers, which are staggered on the upper and lower sides of the stretching roller.

[0011] In this technical solution, the number of the second pressure roller and the second pressure roller cylinder are the same, the telescopic end of each second pressure roller cylinder is fixedly connected to the bearing seat, and both ends of the second pressure roller are rotatably connected to the bearing seat.

[0012] In this technical solution, the diameter of the second pressure roller is 90mm, the second pressure roller is spaced between the first pressure roller, the second pressure roller cylinder is arranged with an inclined structure, and the second pressure roller cylinder and the first pressure roller cylinder are arranged alternately.

[0013] In this technical solution, the collector pipe is disposed between the first pressure roller cylinder and the second pressure roller cylinder. The collector pipe is arranged at an angle and distributed parallel to the first pressure roller cylinder. The hollow scraper at the end of the collector pipe is disposed between the second pressure rollers.

[0014] In this technical solution, the hollow scraper is a flat hollow structure, the side of the hollow scraper is in contact with the surface of the second pressure roller, and the length of the hollow scraper is the same as the length of the second pressure roller.

[0015] In this technical solution, the stretching roller, the first pressure roller and the second pressure roller have the same length, and the first pressure roller and the second pressure roller are respectively provided on the upper and lower sides of each stretching roller.

[0016] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0017] The positive and progressive effects of this utility model are as follows:

[0018] The aforementioned degreasing mechanism for the longitudinal stretching machine in a lithium battery separator production line solves the technical problems of slippage between the membrane and rollers, white oil precipitated from the membrane contaminating the membrane and causing quality degradation, and poor degreasing effect after the stretching ratio of the existing longitudinal stretching machine is increased. By modifying the arrangement of the stretching rollers and optimizing their spacing and installation angle, the contact stability between the membrane and the stretching rollers is improved, significantly increasing the friction between them. Slippage is prevented even after the stretching ratio is increased, avoiding membrane scratches and uneven thickness. The structure of the stretching roller side plates is also optimized and modified to adapt to... To address the need for increased pressure roller diameter and adjusted stretching roller arrangement, an auxiliary rubber roller is added to the side plate. This auxiliary rubber roller is pressed onto the uncovered side of the stretching roller by a cylinder to absorb the white oil precipitated from the diaphragm on the surface of the stretching roller. This invention features a simple structure, low modification cost, and requires no large-scale alteration to the main structure of the longitudinal stretching machine. It effectively reduces slippage between the diaphragm and the roller, significantly improves the oil removal rate, reduces the impact of white oil on diaphragm quality, enhances the production stability and product qualification rate of lithium battery separators, and facilitates the upgrading and transformation of existing production lines. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0020] Figure 2 This utility model Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0021] Figure 3 This is a schematic diagram of the internal front view of the present invention.

[0022] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0023] Figure 5 This is a schematic diagram of the external front view of the present invention.

[0024] Figure 6 This is a top view of the structure of this utility model.

[0025] Figure 7 This is a front view structural diagram of the manifold of this utility model.

[0026] Figure 8 This is a partial three-dimensional structural diagram of the fixing tube of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 11. Upright frame; 111. Manifold; 112. Hollow scraper; 113. Negative pressure pipe; 114. Fixing pipe; 1141. Elongated hole; 1142. Positioning hole; 1143. Mounting part; 115. Movable shaft; 116. Spring; 117. Connecting rod; 118. Bolt; 12. Upright plate; 121. Tensioning roller; 122. Tensioning roller side plate; 123. First pressure roller; 124. First pressure roller cylinder; 125. Bearing seat; 126. Second pressure roller; 127. Second pressure roller cylinder; 128. Tensioning roller lifting cylinder; 13. Air distributor. Detailed Implementation

[0029] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0030] like Figure 1-8 As shown, the oil removal mechanism of the longitudinal stretching machine in the lithium battery separator production line includes a frame 11, a plate 12, and an air distributor 13. The plate 12 is fixedly installed on the top of the frame 11, and the air distributor 13 is located on one side of the frame 11. The air distributor 13 is fixed to the ground by a mounting bracket. The air distributor 13 is used for air circuit control and realizes centralized air supply and centralized control of the cylinders on the frame 11.

[0031] There are two of each of the uprights 11 and upright plates 12. Both upright plates 12 are fixedly installed to the ground via the uprights 11. A collection mechanism is fixedly installed on the inner wall of both the uprights 11 and the upright plates 12. The collection mechanism can collect the white oil that is separated during the diaphragm production, and can ensure that the white oil is collected to prevent it from contaminating the membrane and causing quality decline and poor oil removal effect.

[0032] The collection mechanism includes a collection pipe 111 and a hollow scraper 112. The collection pipe 111 is fixedly installed to the inner wall of the frame 11 and the upright plate 12 by a fixing component. The hollow scraper 112 is fixedly connected to the collection pipe 111. The end of the collection pipe 111 located on the upright plate 12 is fixedly connected to the negative pressure pipe 113. The negative pressure pipe 113 is connected to an external air source. Through the external air source, airflow can enter from the hollow scraper 112 and carry white oil out from the negative pressure pipe 113, which can effectively improve the oil removal efficiency.

[0033] The manifold 111 is fixedly connected to the middle of the hollow scraper 112. Both ends of the hollow scraper 112 are connected to fixing components. Each fixing component includes a fixing pipe 114, a movable shaft 115, and a connecting rod 117. The fixing pipe 114 is fixedly connected to the inner walls of the support frame 11 and the upright plate 12 via mounting parts 1143. The movable shaft 115 is movably sleeved inside the fixing pipe 114. The movable shaft 115 is connected to one end of the connecting rod 117 via a spring 116, and the other end of the connecting rod 117 is connected to the hollow scraper 11. 2. Fixed connection: The surface of the fixed tube 114 is provided with an elongated hole 1141, and a plurality of evenly distributed positioning holes 1142 are provided at the elongated hole 1141. The diameter of the positioning holes 1142 is larger than the width of the elongated hole 1141. The movable shaft 115 is threadedly connected to a bolt 118. The bolt 118 is slidably connected to the elongated hole 1141. The end of the bolt 118 is fitted into one of the positioning holes 1142. The collecting pipe 111 located below the stretching roller 121 is connected to the collecting container through a flexible hose.

[0034] In specific operation, the elasticity of spring 116 pushes the connecting rod 117 and the hollow scraper 112 to move, so that the top of the hollow scraper 112 always keeps in contact with the second pressure roller 126. By loosening bolt 118, its end is separated from the positioning hole 1142. At this time, bolt 118 is not separated from the movable shaft 115. By pushing bolt 118, the movable shaft 115 moves in the fixed tube 114. After the movement is completed, bolt 118 is tightened again, so that the end of bolt 118 is re-embedded in the positioning hole 1142 to achieve the limit, thereby achieving the limit of bolt 118. The contact pressure between hollow scraper 112 and second pressure roller 126 is achieved by adjusting the position of movable shaft 115. It can be adjusted according to the needs of use, ensuring that it can be easily adjusted after long-term use, so that hollow scraper 112 can always maintain a certain contact pressure with the surface of second pressure roller 126.

[0035] The upright plate 12 is provided with a plurality of stretching rollers 121, both ends of which are rotatably connected to the stretching roller side plate 122. A stretching roller lifting cylinder 128 is fixedly installed on the upright plate 12, and the telescopic end of the stretching roller lifting cylinder 128 is fixedly connected to the stretching roller side plate 122. In this way, the lithium battery separator is stretched longitudinally by the stretching rollers 121, and at the same time, the telescopic extension and retraction of the stretching roller lifting cylinder 128 can drive the stretching roller side plate 122 to move vertically, thereby realizing the position adjustment of the stretching rollers 121.

[0036] Multiple inclined first pressure roller cylinders 124 are fixedly installed on the upright plate 12. The telescopic ends of the first pressure roller cylinders 124 are all fixedly connected to the bearing seats 125. The bearing seats 125 are rotatably connected to the first pressure rollers 123. Both ends of the first pressure rollers 123 are located inside the bearing seats 125, and the diameter of the first pressure rollers 123 is 150mm.

[0037] There are multiple first pressure rollers 123, which are staggered on the upper and lower sides of the stretching roller 121. In this way, when the lithium battery separator is produced, it is wound around the stretching roller 121. The compression between the first pressure rollers 123 and the stretching roller 121 and the different rotation speeds cause the battery separator to be stretched longitudinally while being transported. The anti-slip design of the first pressure rollers 123 and the stretching roller 121 can prevent the separator from slipping.

[0038] The support frame 11 and the side wall of the support plate 12 are provided with a plurality of evenly distributed second pressure roller cylinders 127 and second pressure rollers 126. The number of second pressure rollers 126 and second pressure roller cylinders 127 is the same. The telescopic end of each second pressure roller cylinder 127 is fixedly connected to the bearing seat 125. Both ends of the second pressure roller 126 are rotatably connected to the bearing seat 125. In this way, the second pressure roller 126 can be telescopically driven by the second pressure roller cylinders 127, and the second pressure roller 126 is driven to contact the stretching roller. On the surface of cylinder 121, the contact surface between the second pressure roller 126 and the stretching roller 121 is a non-diaphragm adhesion area. That is, when the diaphragm is stretched longitudinally, it is stretched and conveyed on one side of the stretching roller 121. The white oil that is released during the longitudinal stretching of the diaphragm will adhere to the surface of the stretching roller 121, while the second pressure roller 126 will never contact the diaphragm. The second pressure roller 126 will absorb the white oil on the surface of the stretching roller 121 to achieve adhesion, thereby achieving the absorption of white oil to ensure that the stretching roller 121 will not slip due to excessive white oil.

[0039] The diameter of the second pressure roller 126 is 90mm. The second pressure roller 126 is spaced between the first pressure roller 123. The second pressure roller cylinder 127 is arranged with an inclined structure, and the second pressure roller cylinder 127 and the first pressure roller cylinder 124 are arranged alternately. Placing the second pressure roller cylinder 127 between the first pressure roller cylinders 124 can not only remove white oil, but also facilitate the subsequent assembly and arrangement of the longitudinal stretching machine of the diaphragm production line, so that the installation of the second pressure roller cylinder 127 is not affected by the overall arrangement.

[0040] The stretching roller 121, the first pressure roller 123, and the second pressure roller 126 are of the same length. Each stretching roller 121 is provided with a first pressure roller 123 and a second pressure roller 126 on its upper and lower sides, respectively. In this way, the first pressure roller 123 and the stretching roller 121 can be stretched by a diaphragm, while the second pressure roller 126 is located on the side without diaphragm coverage and is used to adsorb the white oil that is separated from the diaphragm on the surface of the stretching roller 121.

[0041] The second pressure roller 126 is made of an auxiliary rubber roller. The auxiliary rubber roller is pressed onto the side of the stretching roller 121 without membrane coverage by the pressure of the second pressure roller cylinder 127, and is used to adsorb the white oil that is separated from the diaphragm on the surface of the stretching roller 121.

[0042] The collecting pipe 111 is disposed between the first pressure roller cylinder 124 and the second pressure roller cylinder 127. The collecting pipe 111 is inclined and distributed parallel to the first pressure roller cylinder 124. The hollow scraper 112 at the end of the collecting pipe 111 is disposed between the second pressure rollers 126. This arrangement facilitates the installation of the collecting pipe 111 and allows the hollow scraper 112 to be located on one side of the second pressure roller 126, enabling the collecting pipe 111 to collect excess white oil. In specific operation, the white oil collected in the lower hollow scraper 112 can flow out from the negative pressure pipe 113 for collection by gravity, while the white oil in the upper position is collected by negative pressure absorption through the negative pressure pipe 113.

[0043] When the second pressure roller cylinder 127 extends, the second pressure roller cylinder 127 drives the second pressure roller 126 to contact the surface of the stretching roller 121 to achieve white oil adsorption. When enough white oil is attached to the second pressure roller 126, the thickness of the surface of the second pressure roller 126 will increase relatively. At this time, the excess white oil will be scraped off by the hollow scraper 112 and collected in the negative pressure pipe 113 for drainage and removal.

[0044] The hollow scraper 112 has a flat hollow structure. The side of the hollow scraper 112 is in contact with the surface of the second pressure roller 126, and the length of the hollow scraper 112 is the same as the length of the second pressure roller 126. This can remove excess white oil and prevent the white oil from being unable to be absorbed during long-term processing, which would cause slippage and contamination of the film.

[0045] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. An oil removal mechanism for a longitudinal stretching machine in a lithium battery separator production line, comprising a frame (11), a vertical plate (12), and an air distributor (13), wherein the vertical plate (12) is fixedly installed on the top of the frame (11), and the air distributor (13) is disposed on one side of the frame (11), characterized in that, The inner walls of the support frame (11) and the support plate (12) are both fixedly equipped with a collection mechanism. The support plate (12) is provided with multiple stretching rollers (121). Both ends of the stretching rollers (121) are rotatably connected to the stretching roller side plate (122). The support plate (12) is fixedly equipped with a stretching roller lifting cylinder (128). The telescopic end of the stretching roller lifting cylinder (128) is fixedly connected to the stretching roller side plate (122). The support plate (12) is fixedly equipped with multiple inclined first pressure roller cylinders (124). The telescopic ends of the first pressure roller cylinders (124) are all fixedly connected to the bearing seat (125). The bearing seat (125) is rotatably connected to the first pressure roller (123). The side walls of the support frame (11) and the support plate (12) are provided with multiple evenly distributed second pressure roller cylinders (127) and second pressure rollers (126).

2. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: The gas distributor (13) is fixed to the ground by a mounting bracket. There are two uprights (11) and two uprights (12). Both uprights (12) are fixed to the ground by the uprights (11).

3. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: The collection mechanism includes a collection pipe (111) and a hollow scraper (112). The collection pipe (111) is fixedly installed to the inner wall of the frame (11) and the upright plate (12) by a fixing component. The hollow scraper (112) is fixedly connected to the collection pipe (111). The end of the collection pipe (111) located on the upright plate (12) is fixedly connected to the negative pressure pipe (113).

4. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: Both ends of the first pressure roller (123) are located inside the bearing seat (125), and the diameter of the first pressure roller (123) is 150mm.

5. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: There are multiple first pressure rollers (123), and multiple first pressure rollers (123) are arranged alternately on the upper and lower sides of the stretching roller (121).

6. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: The number of the second pressure roller (126) and the second pressure roller cylinder (127) is the same. The telescopic end of each second pressure roller cylinder (127) is fixedly connected to the bearing seat (125), and both ends of the second pressure roller (126) are rotatably connected to the bearing seat (125).

7. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: The diameter of the second pressure roller (126) is 90mm. The second pressure roller (126) is spaced between the first pressure roller (123). The second pressure roller cylinder (127) is arranged with an inclined structure, and the second pressure roller cylinder (127) and the first pressure roller cylinder (124) are arranged alternately.

8. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 3, characterized in that: The collector pipe (111) is located between the first pressure roller cylinder (124) and the second pressure roller cylinder (127). The collector pipe (111) is arranged at an angle and is distributed parallel to the first pressure roller cylinder (124). The hollow scraper (112) at the end of the collector pipe (111) is located between the second pressure rollers (126).

9. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 8, characterized in that: The hollow scraper (112) has a flat hollow structure. The side of the hollow scraper (112) is in contact with the surface of the second pressure roller (126), and the length of the hollow scraper (112) is the same as the length of the second pressure roller (126).

10. The oil removal mechanism of the longitudinal stretching machine in a lithium battery separator production line as described in claim 1, characterized in that: The stretching roller (121), the first pressure roller (123) and the second pressure roller (126) are of the same length, and the first pressure roller (123) and the second pressure roller (126) are respectively provided on the upper and lower sides of each stretching roller (121).

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