Anti-blocking punching device for winding porous membrane

Abstract

The present application relates to the technical field of porous membrane, and particularly relates to a kind of porous membrane winding anti-adhesion punching device.A kind of porous membrane winding anti-adhesion punching device, including shell, rotationally connected with unwinding roller and winding roller in shell, symmetrically distributed sliding block one is slidably connected in shell, symmetrically distributed sliding block one is rotationally connected with first rotating roller, second rotating roller is rotationally connected in shell, first rotating roller and second rotating roller are driven by pulley and belt between first rotating roller, first rotating roller is slidably connected with two extrusion rings on first rotating roller, and the outside of extrusion ring is provided with circumferentially uniformly distributed convex point.The present application is mechanically imprinted to the two edges of porous membrane continuously passing between two rollers by the convex point on the outside of extrusion ring, forms the micro-convex point with the height of 5 μm ~ 50 μm, makes the uniform micron-level gap between adjacent film layers after winding, avoids the adhesion of interlayer due to intermolecular force and electrostatic adsorption.

Description

Technical Field

[0001] This invention relates to the field of porous membrane technology, and in particular to an anti-adhesion perforation device for winding porous membranes. Background Technology

[0002] After coating, phase inversion, or stretching to form pores, porous membranes (such as lithium battery polyolefin separators, polysulfone / polyethersulfone ultrafiltration membranes, PVDF microfiltration membranes, and biological porous membranes) need to be wound into rolls by a winding mechanism for transportation and use. Because these membrane materials are extremely thin (usually 5μm to 50μm), have high surface energy, and are soft, the layers are very prone to adhesion due to intermolecular forces (van der Waals forces) and electrostatic adsorption after winding.

[0003] Existing anti-blocking technologies are mainly divided into two categories. The first category is the chemical method, which involves spraying inorganic powders (such as silica and talc) onto the membrane surface or adding organic anti-blocking agents. This method easily clogs the surface pores and through pores of porous membranes, significantly reducing the effective filtration / permeation area. Furthermore, the powder may fall off and contaminate downstream processes. The second category is the physical method, which uses plasma treatment or corona treatment to increase surface roughness. However, the treatment depth is limited, the effectiveness is short, the equipment is expensive, and uneven treatment can easily lead to localized adhesion points. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art mentioned in the background section, the present invention provides an anti-adhesion perforation device for winding porous membranes.

[0005] The technical solution of the present invention is as follows: A perforation device for preventing adhesion of porous membranes during winding includes a housing, an unwinding roller and a winding roller rotatably connected inside the housing, the unwinding roller and the winding roller being located on opposite sides of the housing, a set of symmetrically distributed sliders slidably connected inside the housing, the set of symmetrically distributed sliders being rotatably connected to a first rotating roller, a second rotating roller rotatably connected inside the housing, the first rotating roller and the second rotating roller being driven by a pulley and a belt, and a first belt tensioning device being provided between the first rotating roller and the second rotating roller, two extrusion rings slidably connected on the first rotating roller, the outer side of the extrusion rings being provided with circumferentially evenly distributed protrusions, a drive motor being installed inside the housing, the output shaft of the drive motor being driven by a pulley and a belt, and a second belt tensioning device being provided between the output shaft of the drive motor and the first rotating roller.

[0006] Furthermore, the convex point is spherical in shape.

[0007] Furthermore, a rotating sleeve is rotatably connected to the extrusion ring, and symmetrically distributed sliders are rotatably connected to threaded rods. The symmetrically distributed rotating sleeves are all threadedly connected to the threaded rods.

[0008] Furthermore, the threaded rod has two threads with opposite directions of rotation, and symmetrically distributed rotating sleeves engage with adjacent threads on the threaded rod.

[0009] Furthermore, symmetrically distributed electric push rods are installed inside the housing, and a pressure sensor is provided on the outer side of the first rotating roller. The telescopic ends of the electric push rods are fixedly connected to the adjacent sliders.

[0010] Furthermore, the first rotating roller is equipped with a heating element and a PID temperature controller.

[0011] Furthermore, it also includes an electrostatic eliminator, which is disposed within the housing and located downstream of the first rotating roller and the second rotating roller.

[0012] Furthermore, a fixed frame is fixedly installed inside the housing, and a slider two is slidably connected inside the fixed frame, with a spring one connecting the two. A squeezing roller is rotatably connected to the slider two. A sliding frame one is slidably connected inside the housing, and a slider three is slidably connected inside the sliding frame one, with a spring two connecting the two. A drive motor two is installed on the slider three. A rotating rod is rotatably connected inside the housing, and the rotating rod is driven by a pulley and a belt to the winding roller.

[0013] Furthermore, a conical wheel is fixedly connected to the rotating rod, and a transmission wheel is fixedly connected to the output shaft of the second drive motor. The transmission wheel contacts the side of the conical wheel and transmits power through friction.

[0014] Furthermore, both slider two and sliding frame one are fixedly equipped with racks, and a gearbox is fixedly installed inside the housing, with both racks meshing with gears on the gearbox.

[0015] The present invention has the following advantages: 1. The present invention uses the protrusions on the outside of the extrusion ring to mechanically imprint the two edges of the porous membrane that passes continuously between two rollers, forming micro-protrusions with a height of 5μm to 50μm. This ensures that the adjacent film layers maintain a uniform micron-level gap after winding, avoiding adhesion between layers caused by intermolecular forces and electrostatic adsorption.

[0016] 2. This invention drives two rotating sleeves to move simultaneously toward or away from each other by rotating a threaded rod, so that the protrusions can be accurately aligned with the two edges of film materials of different widths, ensuring that the effective area in the middle is not subject to any imprinting, and realizing stepless adjustment of the gap between the extrusion rings.

[0017] 3. The present invention uses an electric push rod to push the slider to move horizontally, causing the first rotating roller to move closer to or further away from the second rotating roller. In conjunction with a pressure sensor attached to the surface of the first rotating roller, the pressure signal is fed back to the controller in real time, forming a closed-loop pressure control to ensure the consistency of the protrusion height and avoid insufficient protrusion or membrane puncture caused by pressure fluctuations.

[0018] 4. The present invention uses a heating element and a PID temperature controller inside the first rotating roller to precisely control the roller surface temperature within a range of 10°C to 20°C lower than the glass transition temperature of the porous membrane material. This allows the membrane material to obtain good plasticity during perforation, making it easier to form bumps and reducing the springback rate to less than 5%. At the same time, it can appropriately reduce the required linear pressure and avoid microcracks and excessive springback that may occur during cold printing.

[0019] 5. This invention senses changes in film tension by using an extrusion roller, causing the drive motor and transmission wheel to move axially along the conical wheel, changing the contact diameter between the transmission wheel and the conical wheel, thereby automatically adjusting the winding speed and avoiding uneven winding or film stretching deformation caused by tension fluctuations due to changes in film roll diameter. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural cross-sectional view of the housing of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the first rotating roller, the second rotating roller, and the extrusion ring of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the threaded rod, heating element, and PID temperature controller of the present invention.

[0024] Figure 5 This is a three-dimensional structural diagram of the second spring, the second drive motor, and the rotating rod of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the conical wheel, transmission wheel, and rack of the present invention.

[0026] In the above attached figures: 1-Housing, 2-Unwinding roller, 3-Take-up roller, 4-Slider 1, 5-First rotating roller, 6-Second rotating roller, 7-Extrusion ring, 8-Drive motor 1, 9-Rotating sleeve, 10-Threaded rod, 11-Electric push rod, 12-Pressure sensor, 13-Heating element, 14-PID temperature controller, 15-Static eliminator, 16-Fixed frame, 17-Slider 2, 18-Spring 1, 19-Extrusion roller, 20-Sliding frame 1, 21-Slider 3, 22-Spring 2, 23-Drive motor 2, 24-Rotating rod, 25-Conical wheel, 26-Transmission wheel, 27-Rack, 28-Gearbox. Detailed Implementation

[0027] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] Example 1: A perforation device for preventing adhesion of porous membranes during winding, such as... Figures 1-4As shown, the device includes a housing 1, which is welded from stainless steel plates. An unwinding roller 2 is rotatably connected to one side of the housing 1 via a rolling bearing. The unwinding roller 2 is used to fix the porous film roll and achieve passive unwinding. A magnetic powder brake (not shown in the figure) is connected to the shaft end of the unwinding roller 2 to provide constant unwinding tension. A take-up roller 3 is rotatably connected to the other side of the housing 1 via a rolling bearing. The take-up roller 3 is used for active take-up and maintaining constant take-up tension. The unwinding roller 2 and the take-up roller 3 are located on the upper and lower sides of the housing 1, respectively. The film material is conveyed from top to bottom. A horizontal groove is machined on the side wall of the housing 1. A slider 4 is slidably connected in the groove. Slider 4 is a rectangular block that fits the groove with a clearance and can slide freely in the horizontal direction. A first rotating roller 5 is rotatably connected between two sliders 4 via a rolling bearing. The first rotating roller 5 is a steel round roller with a continuous keyway machined along its outer circumference. A second rotating roller 6 is rotatably connected to the side of the first rotating roller 5 inside the housing 1 via a fixed bearing seat. The surface of the second rotating roller 6 is covered with a smooth elastic layer made of silicone rubber. It possesses appropriate hardness and elasticity to support the back of the membrane material and prevent puncture during perforation. The first rotating roller 5 and the second rotating roller 6 are connected by a pulley and belt drive, and a first belt tensioning device is provided between them to adjust the belt tension and ensure smooth transmission. Two extrusion rings 7 are slidably fitted on the first rotating roller 5 through a keyway. The extrusion ring 7 is a circular part with its inner hole clearance-fitted with the first rotating roller 5, and is provided with a key that engages with the keyway on the first rotating roller 5, thereby achieving circumferential positioning and axial sliding. Each extrusion ring... The outer circumferential surface of 7 is formed with circumferentially uniformly distributed protrusions by electroforming or precision machining. The protrusions are spherical in shape and have a height of 5μm to 50μm. The protrusions are arranged in an array to press out micron-level protrusions at the edge of the film material, thereby forming interlayer gaps after winding. A drive motor 8 is fixedly installed inside the housing 1. The output shaft of the drive motor 8 is connected to the first rotating roller 5 through a pulley and a belt. A second belt tensioning device is provided between the output shaft of the drive motor 8 and the first rotating roller 5 to adjust the tension of the belt.

[0029] like Figures 2-4As shown, a rotating sleeve 9 is rotatably connected to the end flange of each extrusion ring 7 via a rolling bearing. The rotating sleeve 9 can rotate freely relative to the extrusion ring 7 but cannot move axially. The inner holes of the two rotating sleeves 9 are respectively machined with threads, and the two threads have opposite directions of rotation. A threaded rod 10 is rotatably connected between the two sliders 4 via a rolling bearing. The threaded rod 10 has two sections of threads with opposite directions of rotation, which respectively engage with the two rotating sleeves 9. When the threaded rod 10 is rotated, the two rotating sleeves 9 move simultaneously towards or away from each other, thereby driving the two extrusion rings 7 to slide axially along the first rotating roller 5. This is used to quickly adjust the distance between the two extrusion rings 7 to adapt to porous membranes of different widths, ensuring that the protrusions are always pressed on the two edges of the membrane material (leaving 5% to 15% width on each side), while the effective area in the middle is not subject to any imprinting.

[0030] like Figure 2 and Figure 3 As shown, two symmetrically distributed electric push rods 11 are fixedly installed inside the housing 1. The cylinders of the two electric push rods 11 are fixed to the side wall of the housing 1 by brackets. The telescopic ends of the electric push rods 11 are fixedly connected to the adjacent sliders 4. The electric push rods 11 are used to push the sliders 4 to move horizontally, thereby changing the clamping force between the first rotating roller 5 and the second rotating roller 6. A pressure sensor 12 is provided on the outer side of the first rotating roller 5. The pressure sensor 12 is attached to the surface of the first rotating roller 5 and is used to detect the pressure on the first rotating roller 5 in real time and feed the signal back to the controller to cooperate with the electric push rods 11 to achieve closed-loop pressure control.

[0031] The operator installs the porous membrane roll onto the unwinding roller 2. The membrane material is drawn out from the unwinding roller 2 and passes around each guide roller in sequence before entering the pressing area between the first rotating roller 5 and the second rotating roller 6, and finally winding onto the take-up roller 3.

[0032] At this time, the operator adjusts the position of the two extrusion rings 7 according to the width of the membrane material. The operator rotates the threaded rod 10 to make the two rotating sleeves 9 move at the same time. The rotating sleeves 9 drive the extrusion rings 7 to slide along the axis of the first rotating roller 5, so that the protrusions on the outer side of the extrusion rings 7 are aligned with the two edges of the membrane material. At the same time, the operator sets the target line pressure.

[0033] Subsequently, the operator starts drive motor 8. The output shaft of drive motor 8 drives the first rotating roller 5 to rotate via pulleys and belts. The first rotating roller 5 drives the second rotating roller 6 to rotate synchronously via pulleys and belts. The porous membrane continuously passes through the pressing area under the drive of the first rotating roller 5 and the second rotating roller 6. During this process, the two extrusion rings 7 on the first rotating roller 5 rotate with it. The protrusions on the outer side of the extrusion rings 7 press out micro-protrusions on the two edges of the porous membrane. The smooth elastic layer on the surface of the second rotating roller 6 undergoes local compression deformation when the protrusions are pressed in, providing uniform conformal support for the back of the membrane material and preventing the protrusions from piercing the membrane material. After the membrane material is perforated, it leaves the pressing area and is wound into a roll by the winding roller 3 after being guided. At this time, due to the support of the protrusions on the edges of the membrane material, a gap is maintained between the layers, thus avoiding adhesion.

[0034] During the rotation of the first rotating roller 5, the pressure sensor 12 detects the pressure on the first rotating roller 5 in real time. If the measured pressure is too low, the electric push rod 11 extends and pushes the slider 4 to move closer to the second rotating roller 6. The slider 4 drives the first rotating roller 5 to move closer to the second rotating roller 6, increasing the clamping force. Conversely, the electric push rod 11 retracts to reduce the clamping force. During this process, the first belt tensioning device and the second belt tensioning device adjust the tension of the two belts respectively to prevent the belts from slipping.

[0035] Example 2: Based on Example 1, such as Figure 4 As shown, the first rotating roller 5 is equipped with a heating element 13 and a PID temperature controller 14. The heating element 13 is an electric heating tube, which is evenly distributed inside the first rotating roller 5 to heat the roller surface to a set temperature. The PID temperature controller 14 includes a temperature sensor and a temperature control instrument installed on the surface of the first rotating roller 5. The temperature control instrument controls the on / off state of the heating element 13 according to the deviation between the set temperature and the actual temperature, so that the roller surface temperature is stabilized in the range of 10℃ to 20℃ lower than the glass transition temperature of the porous membrane material. Heating can make the membrane material obtain good plasticity when punching holes, making the bump forming easier and the springback rate less than 5%. At the same time, it can appropriately reduce the required linear pressure.

[0036] The operator sets the heating temperature, and the PID temperature controller 14 controls the heating element 13 to be powered on and heated. The heating element 13 is evenly distributed in the blind holes inside the first rotating roller 5 along the axial direction, raising the roller surface temperature of the first rotating roller 5 to the heating temperature, making the protrusion forming easier and the rebound rate smaller.

[0037] Example 3: Based on Example 2, such as Figure 1 and Figure 2As shown, an electrostatic eliminator 15 is fixedly installed inside the housing 1 downstream of the first rotating roller 5 and the second rotating roller 6 (i.e., after the perforation process and before winding). The electrostatic eliminator 15 is an AC ion air bar with a length greater than the width of the film material. The electrostatic eliminator 15 is connected to a high-voltage power supply, and its emitter generates a large number of positive and negative ions. The ions are blown to the surface of the film material by the ion air to neutralize the static charge generated by the friction of the film material, effectively preventing static electricity from adsorbing dust and avoiding the aggravation of interlayer adhesion by static electricity during winding.

[0038] After being perforated, the porous membrane leaves the pressing area between the first rotating roller 5 and the second rotating roller 6 and immediately enters the working area of ​​the static eliminator 15. The emitter of the static eliminator 15 generates a large number of positive and negative ions. The ion wind blown out by the ion wind bar neutralizes the static charge generated on the surface of the porous membrane due to friction, preventing residual static electricity from attracting dust and reducing the interlayer adsorption force aggravated by static electricity during winding.

[0039] Example 4: Based on Example 3, such as Figure 2 , Figure 5 and Figure 6 As shown, a fixed frame 16 is fixedly installed inside the housing 1. A slider 17 is slidably connected inside the fixed frame 16. A spring 18 is connected between the slider 17 and the fixed frame 16. A pressing roller 19 is rotatably connected to the slider 17. Before entering the perforated roller group, the film material passes around the side of the pressing roller 19. The tension of the film material acts on the pressing roller 19, causing the pressing roller 19 to generate reverse pressure on the film material. At the same time, the pressing roller 19 transmits the tension change to the slider 17.

[0040] like Figure 5 and Figure 6 As shown, a sliding frame 20 is slidably connected inside the housing 1, and a slider 21 is slidably connected inside the sliding frame 20. A spring 22 is connected between the slider 21 and the sliding frame 20. A drive motor 23 is fixedly installed on the slider 21. A rotating rod 24 is rotatably connected inside the housing 1. The rotating rod 24 is connected to the winding roller 3 through a pulley and a belt. A conical wheel 25 is fixedly connected to the rotating rod 24. The conical wheel 25 is a conical wheel (the diameter gradually changes along the axial direction). A transmission wheel 26 is fixedly connected to the output shaft of the drive motor 23. The transmission wheel 26 contacts the side of the conical wheel 25 and is driven by friction.

[0041] like Figure 2 , Figure 5 and Figure 6 As shown, racks 27 are fixedly installed on slider 2 17 and sliding frame 20 respectively. Both racks 27 mesh with gears in gearbox 28 fixed in housing 1. The gear transmission in gearbox 28 makes the sliding direction of slider 2 17 opposite to the sliding direction of sliding frame 20, and the sliding distance is proportional.

[0042] During winding, the operator first starts the second drive motor 23. The second drive motor 23 drives the rotating rod 24 to rotate through the transmission wheel 26 and the cone wheel 25. When the transmission wheel 26 rotates, it drives the cone wheel 25 to rotate through friction, which drives the rotating rod 24 to rotate. The rotating rod 24 is connected to the winding roller 3 through the pulley and belt, which drives the winding roller 3 to rotate and wind the film into a roll.

[0043] During the winding process, the tension of the film material needs to be kept constant. Before the film material enters the pressing area, the film material passes around the side of the extrusion roller 19. The tension of the film material acts on the extrusion roller 19, causing the extrusion roller 19 to generate a reverse pressure on the film material.

[0044] As the diameter of the film roll on the take-up roller 3 gradually increases, the tension of the film tends to increase. At this time, the thrust of the film on the extrusion roller 19 increases, pushing the slider 17 to slide in the fixed frame 16 towards the compression spring 18. The slider 17 drives the gear on the upper side of the gearbox 28 to rotate. Then, through the gear transmission in the gearbox 28, the gear on the lower side of the gearbox 28 drives the rack 27 on the other side to move in the opposite direction, causing the sliding frame 20 to slide. The sliding distance of the sliding frame 20 is less than that of the slider 17.

[0045] When the sliding frame 20 slides, it drives the slider 21 and the drive motor 23 on it to move together. When the drive motor 23 moves, the contact position between the transmission wheel 26 on its output shaft and the cone wheel 25 moves towards the smaller end (smaller diameter end) of the cone wheel 25. Since the transmission wheel 26 and the cone wheel 25 are friction transmissions, the diameter of the cone wheel 25 at the contact point decreases, and the transmission ratio decreases. Therefore, when the speed of the drive motor 23 remains constant, the speed of the cone wheel 25 decreases, the speed of the rotating rod 24 decreases, the linear speed of the winding roller 3 decreases, and the tension of the film material falls back to the set value. Conversely, when the diameter of the film roll is small, the elastic force of the spring 18 pushes the slider 27 to reset, causing the sliding frame 20 to move in the opposite direction. The drive motor 23 drives the transmission wheel 26 to move towards the larger end of the cone wheel 25, increasing the transmission ratio and increasing the winding speed, while maintaining constant tension. During this process, the spring 22 is used to ensure that the transmission wheel 26 and the cone wheel 25 are in contact.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A perforation device for preventing adhesion during porous membrane winding, characterized in that, The device includes a housing (1), inside which an unwinding roller (2) and a winding roller (3) are rotatably connected. The unwinding roller (2) and the winding roller (3) are located on opposite sides inside the housing (1). Inside the housing (1), there are symmetrically distributed sliders (4). The symmetrically distributed sliders (4) are rotatably connected to a first rotating roller (5). Inside the housing (1), there is a second rotating roller (6). The first rotating roller (5) and the second rotating roller (6) are driven by a pulley and a belt. A first belt tensioning device is provided between the first rotating roller (5) and the second rotating roller (6). Two extrusion rings (7) are slidably connected on the first rotating roller (5). The outer side of the extrusion rings (7) is provided with circumferentially evenly distributed protrusions. Inside the housing (1), there is a drive motor (8). The output shaft of the drive motor (8) is driven by a pulley and a belt to the first rotating roller (5). A second belt tensioning device is provided between the output shaft of the drive motor (8) and the first rotating roller (5).

2. The anti-adhesion perforation device for porous membrane winding according to claim 1, characterized in that, The convex point is spherical.

3. The anti-adhesion perforation device for porous membrane winding according to claim 1, characterized in that, A rotating sleeve (9) is rotatably connected to the extrusion ring (7), and the symmetrically distributed sliders (4) are rotatably connected to the threaded rod (10). The symmetrically distributed rotating sleeves (9) are all threadedly connected to the threaded rod (10).

4. The anti-adhesion perforation device for porous membrane winding according to claim 3, characterized in that, The threaded rod (10) has two threads with opposite directions of rotation, and the symmetrically distributed rotating sleeves (9) are engaged with the adjacent threads on the threaded rod (10).

5. A perforation device for preventing adhesion during porous membrane winding according to claim 3, characterized in that, The housing (1) is equipped with symmetrically distributed electric push rods (11), and a pressure sensor (12) is provided on the outer side of the first rotating roller (5). The telescopic ends of the electric push rods (11) are fixedly connected to the adjacent sliders (4).

6. The anti-adhesion perforation device for porous membrane winding according to claim 5, characterized in that, The first rotating roller (5) is equipped with a heating element (13) and a PID temperature controller (14).

7. A perforation device for preventing adhesion during porous membrane winding according to claim 6, characterized in that, It also includes an electrostatic eliminator (15), which is disposed inside the housing (1) and is located downstream of the first rotating roller (5) and the second rotating roller (6).

8. A perforation device for preventing adhesion during porous membrane winding according to claim 7, characterized in that, A fixed frame (16) is fixedly installed inside the housing (1). A slider two (17) is slidably connected inside the fixed frame (16), and a spring one (18) is connected between the two. A squeezing roller (19) is rotatably connected to the slider two (17). A sliding frame one (20) is slidably connected inside the housing (1). A slider three (21) is slidably connected inside the sliding frame one (20), and a spring two (22) is connected between the two. A drive motor two (23) is installed on the slider three (21). A rotating rod (24) is rotatably connected inside the housing (1). The rotating rod (24) is driven by a pulley and a belt to the winding roller (3).

9. A perforation device for preventing adhesion during porous membrane winding according to claim 8, characterized in that, A conical wheel (25) is fixedly connected to the rotating rod (24), and a transmission wheel (26) is fixedly connected to the output shaft of the second drive motor (23). The transmission wheel (26) contacts the side of the conical wheel (25) and is driven by friction.

10. A perforation device for preventing adhesion during porous membrane winding according to claim 9, characterized in that the slider... Both the second (17) and the first sliding frame (20) are fixedly equipped with racks (27), and a gearbox (28) is fixedly installed inside the housing (1). Both racks (27) mesh with the gears on the gearbox (28).

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